#include <sys/cdefs.h>
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_ratelimit.h"
#include "opt_kern_tls.h"
#if defined(INET) || defined(INET6)
#include <sys/param.h>
#include <sys/arb.h>
#include <sys/module.h>
#include <sys/kernel.h>
#ifdef TCP_HHOOK
#include <sys/hhook.h>
#endif
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#ifdef STATS
#include <sys/qmath.h>
#include <sys/tree.h>
#include <sys/stats.h>
#else
#include <sys/tree.h>
#endif
#include <sys/refcount.h>
#include <sys/queue.h>
#include <sys/tim_filter.h>
#include <sys/smp.h>
#include <sys/kthread.h>
#include <sys/kern_prefetch.h>
#include <sys/protosw.h>
#ifdef TCP_ACCOUNTING
#include <sys/sched.h>
#include <machine/cpu.h>
#endif
#include <vm/uma.h>
#include <net/route.h>
#include <net/route/nhop.h>
#include <net/vnet.h>
#define TCPSTATES
#include <netinet/in.h>
#include <netinet/in_kdtrace.h>
#include <netinet/in_pcb.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip6.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/ip6_var.h>
#include <netinet/tcp.h>
#define TCPOUTFLAGS
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_log_buf.h>
#include <netinet/tcp_syncache.h>
#include <netinet/tcp_hpts.h>
#include <netinet/tcp_ratelimit.h>
#include <netinet/tcp_accounting.h>
#include <netinet/tcpip.h>
#include <netinet/cc/cc.h>
#include <netinet/cc/cc_newreno.h>
#include <netinet/tcp_fastopen.h>
#include <netinet/tcp_lro.h>
#ifdef NETFLIX_SHARED_CWND
#include <netinet/tcp_shared_cwnd.h>
#endif
#ifdef TCP_OFFLOAD
#include <netinet/tcp_offload.h>
#endif
#ifdef INET6
#include <netinet6/tcp6_var.h>
#endif
#include <netinet/tcp_ecn.h>
#include <netipsec/ipsec_support.h>
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
#include <netipsec/ipsec.h>
#include <netipsec/ipsec6.h>
#endif
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <machine/in_cksum.h>
#ifdef MAC
#include <security/mac/mac_framework.h>
#endif
#include "sack_filter.h"
#include "tcp_rack.h"
#include "tailq_hash.h"
#include "rack_bbr_common.h"
uma_zone_t rack_zone;
uma_zone_t rack_pcb_zone;
#ifndef TICKS2SBT
#define TICKS2SBT(__t) (tick_sbt * ((sbintime_t)(__t)))
#endif
VNET_DECLARE(uint32_t, newreno_beta);
VNET_DECLARE(uint32_t, newreno_beta_ecn);
#define V_newreno_beta VNET(newreno_beta)
#define V_newreno_beta_ecn VNET(newreno_beta_ecn)
#define M_TCPFSB __CONCAT(M_TCPFSB, STACKNAME)
#define M_TCPDO __CONCAT(M_TCPDO, STACKNAME)
MALLOC_DEFINE(M_TCPFSB, "tcp_fsb_" __XSTRING(STACKNAME), "TCP fast send block");
MALLOC_DEFINE(M_TCPDO, "tcp_do_" __XSTRING(STACKNAME), "TCP deferred options");
MALLOC_DEFINE(M_TCPPCM, "tcp_pcm_" __XSTRING(STACKNAME), "TCP PCM measurement information");
struct sysctl_ctx_list rack_sysctl_ctx;
struct sysctl_oid *rack_sysctl_root;
#define CUM_ACKED 1
#define SACKED 2
static int32_t rack_tlp_thresh = 1;
static int32_t rack_tlp_limit = 2;
static int32_t rack_tlp_use_greater = 1;
static int32_t rack_reorder_thresh = 2;
static int32_t rack_reorder_fade = 60000000;
static uint32_t rack_pcm_every_n_rounds = 100;
static uint32_t rack_pcm_blast = 0;
static uint32_t rack_pcm_is_enabled = 1;
static uint8_t rack_ssthresh_rest_rto_rec = 0;
static uint32_t rack_gp_gain_req = 1200;
static uint32_t rack_rnd_cnt_req = 0x10005;
static int32_t rack_rxt_scoreboard_clear_thresh = 2;
static int32_t rack_dnd_default = 0;
static int32_t rack_rxt_controls = 0;
static int32_t rack_fill_cw_state = 0;
static uint8_t rack_req_measurements = 1;
static uint32_t rack_rtt_divisor = 2;
static int32_t rack_enable_hw_pacing = 0;
static int32_t rack_hw_rate_caps = 0;
static int32_t rack_hw_rate_cap_per = 0;
static int32_t rack_hw_rate_min = 0;
static int32_t rack_hw_rate_to_low = 0;
static int32_t rack_hw_up_only = 0;
static int32_t rack_stats_gets_ms_rtt = 1;
static int32_t rack_prr_addbackmax = 2;
static int32_t rack_do_hystart = 0;
static int32_t rack_apply_rtt_with_reduced_conf = 0;
static int32_t rack_hibeta_setting = 0;
static int32_t rack_default_pacing_divisor = 250;
static uint16_t rack_pacing_min_seg = 0;
static int32_t rack_timely_off = 0;
static int32_t rack_pkt_delay = 1000;
static int32_t rack_send_a_lot_in_prr = 1;
static int32_t rack_min_to = 1000;
static int32_t rack_verbose_logging = 0;
static int32_t rack_ignore_data_after_close = 1;
static int32_t rack_enable_shared_cwnd = 1;
static int32_t rack_use_cmp_acks = 1;
static int32_t rack_use_fsb = 1;
static int32_t rack_use_rfo = 1;
static int32_t rack_use_rsm_rfo = 1;
static int32_t rack_max_abc_post_recovery = 2;
static int32_t rack_client_low_buf = 0;
static int32_t rack_dsack_std_based = 0x3;
static int32_t rack_bw_multipler = 0;
#ifdef TCP_ACCOUNTING
static int32_t rack_tcp_accounting = 0;
#endif
static int32_t rack_limits_scwnd = 1;
static int32_t rack_enable_mqueue_for_nonpaced = 0;
static int32_t rack_hybrid_allow_set_maxseg = 0;
static int32_t rack_disable_prr = 0;
static int32_t use_rack_rr = 1;
static int32_t rack_non_rxt_use_cr = 0;
static int32_t rack_persist_min = 250000;
static int32_t rack_persist_max = 2000000;
static int32_t rack_honors_hpts_min_to = 1;
static uint32_t rack_max_reduce = 10;
static int32_t rack_sack_not_required = 1;
static int32_t rack_limit_time_with_srtt = 0;
static int32_t rack_autosndbuf_inc = 20;
static int32_t rack_enobuf_hw_boost_mult = 0;
static int32_t rack_enobuf_hw_max = 12000;
static int32_t rack_enobuf_hw_min = 10000;
static int32_t rack_hw_rwnd_factor = 2;
static int32_t rack_hw_check_queue = 0;
static uint32_t rack_def_data_window = 20;
static uint32_t rack_goal_bdp = 2;
static uint32_t rack_min_srtts = 1;
static uint32_t rack_min_measure_usec = 0;
static int32_t rack_tlp_min = 10000;
static int32_t rack_rto_min = 30000;
static int32_t rack_rto_max = 4000000;
static const int32_t rack_free_cache = 2;
static int32_t rack_hptsi_segments = 40;
static int32_t rack_rate_sample_method = USE_RTT_LOW;
static int32_t rack_pace_every_seg = 0;
static int32_t rack_delayed_ack_time = 40000;
static int32_t rack_pacing_delay_reduction = 4;
static int32_t rack_wma_divisor = 8;
static int32_t rack_cwnd_block_ends_measure = 0;
static int32_t rack_rwnd_block_ends_measure = 0;
static int32_t rack_def_profile = 0;
static int32_t rack_lower_cwnd_at_tlp = 0;
static int32_t rack_always_send_oldest = 0;
static int32_t rack_tlp_threshold_use = TLP_USE_TWO_ONE;
static uint16_t rack_per_of_gp_ss = 250;
static uint16_t rack_per_of_gp_ca = 200;
static uint16_t rack_per_of_gp_rec = 200;
static uint16_t rack_per_of_gp_probertt = 60;
static uint16_t rack_per_of_gp_lowthresh = 40;
static uint16_t rack_per_of_gp_probertt_reduce = 10;
static uint16_t rack_atexit_prtt_hbp = 130;
static uint16_t rack_atexit_prtt = 130;
static uint32_t rack_max_drain_wait = 2;
static uint32_t rack_must_drain = 1;
static uint32_t rack_probertt_use_min_rtt_entry = 1;
static uint32_t rack_probertt_use_min_rtt_exit = 0;
static uint32_t rack_probe_rtt_sets_cwnd = 0;
static uint32_t rack_probe_rtt_safety_val = 2000000;
static uint32_t rack_time_between_probertt = 9600000;
static uint32_t rack_probertt_gpsrtt_cnt_mul = 0;
static uint32_t rack_probertt_gpsrtt_cnt_div = 0;
static uint32_t rack_min_probertt_hold = 40000;
static uint32_t rack_probertt_filter_life = 10000000;
static uint32_t rack_probertt_lower_within = 10;
static uint32_t rack_min_rtt_movement = 250000;
static int32_t rack_pace_one_seg = 0;
static int32_t rack_probertt_clear_is = 1;
static int32_t rack_max_drain_hbp = 1;
static int32_t rack_hbp_thresh = 3;
static int32_t rack_max_per_above = 30;
static int32_t rack_gain_p5_ub = 250;
static int32_t rack_gp_per_bw_mul_up = 2;
static int32_t rack_gp_per_bw_mul_down = 4;
static int32_t rack_gp_rtt_maxmul = 3;
static int32_t rack_gp_rtt_minmul = 1;
static int32_t rack_gp_rtt_mindiv = 4;
static int32_t rack_gp_decrease_per = 80;
static int32_t rack_gp_increase_per = 2;
static int32_t rack_per_lower_bound = 50;
static int32_t rack_per_upper_bound_ss = 0;
static int32_t rack_per_upper_bound_ca = 0;
static int32_t rack_do_dyn_mul = 0;
static int32_t rack_gp_no_rec_chg = 1;
static int32_t rack_timely_dec_clear = 6;
static int32_t rack_timely_max_push_rise = 3;
static int32_t rack_timely_max_push_drop = 3;
static int32_t rack_timely_min_segs = 4;
static int32_t rack_timely_no_stopping = 0;
static int32_t rack_down_raise_thresh = 100;
static int32_t rack_req_segs = 1;
static uint64_t rack_bw_rate_cap = 0;
static uint64_t rack_fillcw_bw_cap = 3750000;
counter_u64_t rack_saw_enobuf;
counter_u64_t rack_saw_enobuf_hw;
counter_u64_t rack_saw_enetunreach;
counter_u64_t rack_persists_sends;
counter_u64_t rack_persists_acks;
counter_u64_t rack_persists_loss;
counter_u64_t rack_persists_lost_ends;
counter_u64_t rack_total_bytes;
#ifdef INVARIANTS
counter_u64_t rack_adjust_map_bw;
#endif
counter_u64_t rack_tlp_tot;
counter_u64_t rack_tlp_newdata;
counter_u64_t rack_tlp_retran;
counter_u64_t rack_tlp_retran_bytes;
counter_u64_t rack_to_tot;
counter_u64_t rack_hot_alloc;
counter_u64_t rack_to_alloc;
counter_u64_t rack_to_alloc_hard;
counter_u64_t rack_to_alloc_emerg;
counter_u64_t rack_to_alloc_limited;
counter_u64_t rack_alloc_limited_conns;
counter_u64_t rack_split_limited;
counter_u64_t rack_rxt_clamps_cwnd;
counter_u64_t rack_rxt_clamps_cwnd_uniq;
counter_u64_t rack_multi_single_eq;
counter_u64_t rack_proc_non_comp_ack;
counter_u64_t rack_fto_send;
counter_u64_t rack_fto_rsm_send;
counter_u64_t rack_nfto_resend;
counter_u64_t rack_non_fto_send;
counter_u64_t rack_extended_rfo;
counter_u64_t rack_sack_proc_all;
counter_u64_t rack_sack_proc_short;
counter_u64_t rack_sack_proc_restart;
counter_u64_t rack_input_idle_reduces;
counter_u64_t rack_collapsed_win;
counter_u64_t rack_collapsed_win_seen;
counter_u64_t rack_collapsed_win_rxt;
counter_u64_t rack_collapsed_win_rxt_bytes;
counter_u64_t rack_try_scwnd;
counter_u64_t rack_hw_pace_init_fail;
counter_u64_t rack_hw_pace_lost;
counter_u64_t rack_out_size[TCP_MSS_ACCT_SIZE];
counter_u64_t rack_opts_arry[RACK_OPTS_SIZE];
#define RACK_REXMTVAL(tp) max(rack_rto_min, ((tp)->t_srtt + ((tp)->t_rttvar << 2)))
#define RACK_TCPT_RANGESET(tv, value, tvmin, tvmax, slop) do { \
(tv) = (value) + slop; \
if ((u_long)(tv) < (u_long)(tvmin)) \
(tv) = (tvmin); \
if ((u_long)(tv) > (u_long)(tvmax)) \
(tv) = (tvmax); \
} while (0)
static void
rack_log_progress_event(struct tcp_rack *rack, struct tcpcb *tp, uint32_t tick, int event, int line);
static int
rack_process_ack(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to,
uint32_t tiwin, int32_t tlen, int32_t * ofia, int32_t thflags, int32_t * ret_val, int32_t orig_tlen);
static int
rack_process_data(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt);
static void
rack_ack_received(struct tcpcb *tp, struct tcp_rack *rack,
uint32_t th_ack, uint16_t nsegs, uint16_t type, int32_t recovery);
static struct rack_sendmap *rack_alloc(struct tcp_rack *rack);
static struct rack_sendmap *rack_alloc_limit(struct tcp_rack *rack,
uint8_t limit_type);
static struct rack_sendmap *
rack_check_recovery_mode(struct tcpcb *tp,
uint32_t tsused);
static uint32_t
rack_grab_rtt(struct tcpcb *tp, struct tcp_rack *rack);
static void
rack_cong_signal(struct tcpcb *tp,
uint32_t type, uint32_t ack, int );
static void rack_counter_destroy(void);
static int
rack_ctloutput(struct tcpcb *tp, struct sockopt *sopt);
static int32_t rack_ctor(void *mem, int32_t size, void *arg, int32_t how);
static void
rack_set_pace_segments(struct tcpcb *tp, struct tcp_rack *rack, uint32_t line, uint64_t *fill_override);
static void
rack_do_segment(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th,
int32_t drop_hdrlen, int32_t tlen, uint8_t iptos);
static void rack_dtor(void *mem, int32_t size, void *arg);
static void
rack_log_alt_to_to_cancel(struct tcp_rack *rack,
uint32_t flex1, uint32_t flex2,
uint32_t flex3, uint32_t flex4,
uint32_t flex5, uint32_t flex6,
uint16_t flex7, uint8_t mod);
static void
rack_log_pacing_delay_calc(struct tcp_rack *rack, uint32_t len, uint32_t pacing_delay,
uint64_t bw_est, uint64_t bw, uint64_t len_time, int method, int line,
struct rack_sendmap *rsm, uint8_t quality);
static struct rack_sendmap *
rack_find_high_nonack(struct tcp_rack *rack,
struct rack_sendmap *rsm);
static struct rack_sendmap *rack_find_lowest_rsm(struct tcp_rack *rack);
static void rack_free(struct tcp_rack *rack, struct rack_sendmap *rsm);
static void rack_fini(struct tcpcb *tp, int32_t tcb_is_purged);
static int rack_get_sockopt(struct tcpcb *tp, struct sockopt *sopt);
static void
rack_do_goodput_measurement(struct tcpcb *tp, struct tcp_rack *rack,
tcp_seq th_ack, int line, uint8_t quality);
static void
rack_log_type_pacing_sizes(struct tcpcb *tp, struct tcp_rack *rack, uint32_t arg1, uint32_t arg2, uint32_t arg3, uint8_t frm);
static uint32_t
rack_get_pacing_len(struct tcp_rack *rack, uint64_t bw, uint32_t mss);
static int32_t rack_handoff_ok(struct tcpcb *tp);
static int32_t rack_init(struct tcpcb *tp, void **ptr);
static void rack_init_sysctls(void);
static void
rack_log_ack(struct tcpcb *tp, struct tcpopt *to,
struct tcphdr *th, int entered_rec, int dup_ack_struck,
int *dsack_seen, int *sacks_seen);
static void
rack_log_output(struct tcpcb *tp, struct tcpopt *to, int32_t len,
uint32_t seq_out, uint16_t th_flags, int32_t err, uint64_t ts,
struct rack_sendmap *hintrsm, uint32_t add_flags, struct mbuf *s_mb, uint32_t s_moff, int hw_tls, int segsiz);
static uint64_t rack_get_gp_est(struct tcp_rack *rack);
static void
rack_log_sack_passed(struct tcpcb *tp, struct tcp_rack *rack,
struct rack_sendmap *rsm, uint32_t cts, int line);
static void rack_log_to_event(struct tcp_rack *rack, int32_t to_num, struct rack_sendmap *rsm);
static int32_t rack_output(struct tcpcb *tp);
static uint32_t
rack_proc_sack_blk(struct tcpcb *tp, struct tcp_rack *rack,
struct sackblk *sack, struct tcpopt *to, struct rack_sendmap **prsm,
uint32_t cts, uint32_t segsiz);
static void rack_post_recovery(struct tcpcb *tp, uint32_t th_seq);
static void rack_remxt_tmr(struct tcpcb *tp);
static int rack_set_sockopt(struct tcpcb *tp, struct sockopt *sopt);
static void rack_set_state(struct tcpcb *tp, struct tcp_rack *rack);
static int32_t rack_stopall(struct tcpcb *tp);
static void rack_timer_cancel(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, int line);
static uint32_t
rack_update_entry(struct tcpcb *tp, struct tcp_rack *rack,
struct rack_sendmap *rsm, uint64_t ts, int32_t * lenp, uint32_t add_flag, int segsiz);
static void
rack_update_rsm(struct tcpcb *tp, struct tcp_rack *rack,
struct rack_sendmap *rsm, uint64_t ts, uint32_t add_flag, int segsiz);
static int
rack_update_rtt(struct tcpcb *tp, struct tcp_rack *rack,
struct rack_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type, tcp_seq th_ack);
static int32_t tcp_addrack(module_t mod, int32_t type, void *data);
static int
rack_do_close_wait(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
static int
rack_do_closing(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
static int
rack_do_established(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
static int
rack_do_fastnewdata(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
int32_t tlen, uint32_t tiwin, int32_t nxt_pkt, uint8_t iptos);
static int
rack_do_fin_wait_1(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
static int
rack_do_fin_wait_2(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
static int
rack_do_lastack(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
static int
rack_do_syn_recv(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
static int
rack_do_syn_sent(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
static void rack_chk_req_and_hybrid_on_out(struct tcp_rack *rack, tcp_seq seq, uint32_t len, uint64_t cts);
struct rack_sendmap *
tcp_rack_output(struct tcpcb *tp, struct tcp_rack *rack,
uint32_t tsused);
static void tcp_rack_xmit_timer(struct tcp_rack *rack, int32_t rtt,
uint32_t len, uint32_t us_tim, int confidence, struct rack_sendmap *rsm, uint16_t rtrcnt);
static void
tcp_rack_partialack(struct tcpcb *tp);
static int
rack_set_profile(struct tcp_rack *rack, int prof);
static void
rack_apply_deferred_options(struct tcp_rack *rack);
int32_t rack_clear_counter=0;
static uint64_t
rack_get_lt_bw(struct tcp_rack *rack)
{
struct timeval tv;
uint64_t tim, bytes;
tim = rack->r_ctl.lt_bw_time;
bytes = rack->r_ctl.lt_bw_bytes;
if (rack->lt_bw_up) {
microuptime(&tv);
bytes += (rack->rc_tp->snd_una - rack->r_ctl.lt_seq);
tim += (tcp_tv_to_lusec(&tv) - rack->r_ctl.lt_timemark);
}
if ((bytes != 0) && (tim != 0))
return ((bytes * (uint64_t)1000000) / tim);
else
return (0);
}
static void
rack_swap_beta_values(struct tcp_rack *rack, uint8_t flex8)
{
struct sockopt sopt;
struct cc_newreno_opts opt;
struct tcpcb *tp;
uint32_t old_beta;
uint32_t old_beta_ecn;
int error = 0, failed = 0;
tp = rack->rc_tp;
if (tp->t_cc == NULL) {
return;
}
rack->rc_pacing_cc_set = 1;
if (strcmp(tp->t_cc->name, CCALGONAME_NEWRENO) != 0) {
failed = 1;
goto out;
}
if (CC_ALGO(tp)->ctl_output == NULL) {
failed = 2;
goto out;
}
sopt.sopt_valsize = sizeof(struct cc_newreno_opts);
sopt.sopt_dir = SOPT_GET;
opt.name = CC_NEWRENO_BETA;
error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, &sopt, &opt);
if (error) {
failed = 3;
goto out;
}
old_beta = opt.val;
opt.name = CC_NEWRENO_BETA_ECN;
error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, &sopt, &opt);
if (error) {
failed = 4;
goto out;
}
old_beta_ecn = opt.val;
sopt.sopt_dir = SOPT_SET;
opt.name = CC_NEWRENO_BETA;
opt.val = rack->r_ctl.rc_saved_beta;
error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, &sopt, &opt);
if (error) {
failed = 5;
goto out;
}
opt.name = CC_NEWRENO_BETA_ECN;
opt.val = rack->r_ctl.rc_saved_beta_ecn;
error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, &sopt, &opt);
if (error) {
failed = 6;
goto out;
}
rack->r_ctl.rc_saved_beta = old_beta;
rack->r_ctl.rc_saved_beta_ecn = old_beta_ecn;
out:
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
struct newreno *ptr;
ptr = ((struct newreno *)tp->t_ccv.cc_data);
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.flex1 = ptr->beta;
log.u_bbr.flex2 = ptr->beta_ecn;
log.u_bbr.flex3 = ptr->newreno_flags;
log.u_bbr.flex4 = rack->r_ctl.rc_saved_beta;
log.u_bbr.flex5 = rack->r_ctl.rc_saved_beta_ecn;
log.u_bbr.flex6 = failed;
log.u_bbr.flex7 = rack->gp_ready;
log.u_bbr.flex7 <<= 1;
log.u_bbr.flex7 |= rack->use_fixed_rate;
log.u_bbr.flex7 <<= 1;
log.u_bbr.flex7 |= rack->rc_pacing_cc_set;
log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex8 = flex8;
tcp_log_event(tp, NULL, NULL, NULL, BBR_LOG_CWND, error,
0, &log, false, NULL, NULL, 0, &tv);
}
}
static void
rack_set_cc_pacing(struct tcp_rack *rack)
{
if (rack->rc_pacing_cc_set)
return;
rack->rc_pacing_cc_set = 1;
rack_swap_beta_values(rack, 3);
}
static void
rack_undo_cc_pacing(struct tcp_rack *rack)
{
if (rack->rc_pacing_cc_set == 0)
return;
rack->rc_pacing_cc_set = 0;
rack_swap_beta_values(rack, 4);
}
static void
rack_remove_pacing(struct tcp_rack *rack)
{
if (rack->rc_pacing_cc_set)
rack_undo_cc_pacing(rack);
if (rack->r_ctl.pacing_method & RACK_REG_PACING)
tcp_decrement_paced_conn();
if (rack->r_ctl.pacing_method & RACK_DGP_PACING)
tcp_dec_dgp_pacing_cnt();
rack->rc_always_pace = 0;
rack->r_ctl.pacing_method = RACK_PACING_NONE;
rack->dgp_on = 0;
rack->rc_hybrid_mode = 0;
rack->use_fixed_rate = 0;
}
static void
rack_log_gpset(struct tcp_rack *rack, uint32_t seq_end, uint32_t ack_end_t,
uint32_t send_end_t, int line, uint8_t mode, struct rack_sendmap *rsm)
{
if (tcp_bblogging_on(rack->rc_tp) && (rack_verbose_logging != 0)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = seq_end;
log.u_bbr.flex2 = rack->rc_tp->gput_seq;
log.u_bbr.flex3 = ack_end_t;
log.u_bbr.flex4 = rack->rc_tp->gput_ts;
log.u_bbr.flex5 = send_end_t;
log.u_bbr.flex6 = rack->rc_tp->gput_ack;
log.u_bbr.flex7 = mode;
log.u_bbr.flex8 = 69;
log.u_bbr.rttProp = rack->r_ctl.rc_gp_cumack_ts;
log.u_bbr.delRate = rack->r_ctl.rc_gp_output_ts;
log.u_bbr.pkts_out = line;
log.u_bbr.cwnd_gain = rack->app_limited_needs_set;
log.u_bbr.pkt_epoch = rack->r_ctl.rc_app_limited_cnt;
log.u_bbr.epoch = rack->r_ctl.current_round;
log.u_bbr.lt_epoch = rack->r_ctl.rc_considered_lost;
if (rsm != NULL) {
log.u_bbr.applimited = rsm->r_start;
log.u_bbr.delivered = rsm->r_end;
log.u_bbr.epoch = rsm->r_flags;
}
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_HPTSI_CALC, 0,
0, &log, false, &tv);
}
}
static int
sysctl_rack_clear(SYSCTL_HANDLER_ARGS)
{
uint32_t stat;
int32_t error;
error = SYSCTL_OUT(req, &rack_clear_counter, sizeof(uint32_t));
if (error || req->newptr == NULL)
return error;
error = SYSCTL_IN(req, &stat, sizeof(uint32_t));
if (error)
return (error);
if (stat == 1) {
#ifdef INVARIANTS
printf("Clearing RACK counters\n");
#endif
counter_u64_zero(rack_tlp_tot);
counter_u64_zero(rack_tlp_newdata);
counter_u64_zero(rack_tlp_retran);
counter_u64_zero(rack_tlp_retran_bytes);
counter_u64_zero(rack_to_tot);
counter_u64_zero(rack_saw_enobuf);
counter_u64_zero(rack_saw_enobuf_hw);
counter_u64_zero(rack_saw_enetunreach);
counter_u64_zero(rack_persists_sends);
counter_u64_zero(rack_total_bytes);
counter_u64_zero(rack_persists_acks);
counter_u64_zero(rack_persists_loss);
counter_u64_zero(rack_persists_lost_ends);
#ifdef INVARIANTS
counter_u64_zero(rack_adjust_map_bw);
#endif
counter_u64_zero(rack_to_alloc_hard);
counter_u64_zero(rack_to_alloc_emerg);
counter_u64_zero(rack_sack_proc_all);
counter_u64_zero(rack_fto_send);
counter_u64_zero(rack_fto_rsm_send);
counter_u64_zero(rack_extended_rfo);
counter_u64_zero(rack_hw_pace_init_fail);
counter_u64_zero(rack_hw_pace_lost);
counter_u64_zero(rack_non_fto_send);
counter_u64_zero(rack_nfto_resend);
counter_u64_zero(rack_sack_proc_short);
counter_u64_zero(rack_sack_proc_restart);
counter_u64_zero(rack_to_alloc);
counter_u64_zero(rack_to_alloc_limited);
counter_u64_zero(rack_alloc_limited_conns);
counter_u64_zero(rack_split_limited);
counter_u64_zero(rack_rxt_clamps_cwnd);
counter_u64_zero(rack_rxt_clamps_cwnd_uniq);
counter_u64_zero(rack_multi_single_eq);
counter_u64_zero(rack_proc_non_comp_ack);
counter_u64_zero(rack_try_scwnd);
counter_u64_zero(rack_collapsed_win);
counter_u64_zero(rack_collapsed_win_rxt);
counter_u64_zero(rack_collapsed_win_seen);
counter_u64_zero(rack_collapsed_win_rxt_bytes);
} else if (stat == 2) {
#ifdef INVARIANTS
printf("Clearing RACK option array\n");
#endif
COUNTER_ARRAY_ZERO(rack_opts_arry, RACK_OPTS_SIZE);
} else if (stat == 3) {
printf("Rack has no stats counters to clear (use 1 to clear all stats in sysctl node)\n");
} else if (stat == 4) {
#ifdef INVARIANTS
printf("Clearing RACK out size array\n");
#endif
COUNTER_ARRAY_ZERO(rack_out_size, TCP_MSS_ACCT_SIZE);
}
rack_clear_counter = 0;
return (0);
}
static void
rack_init_sysctls(void)
{
struct sysctl_oid *rack_counters;
struct sysctl_oid *rack_pacing;
struct sysctl_oid *rack_timely;
struct sysctl_oid *rack_timers;
struct sysctl_oid *rack_tlp;
struct sysctl_oid *rack_misc;
struct sysctl_oid *rack_features;
struct sysctl_oid *rack_measure;
struct sysctl_oid *rack_probertt;
struct sysctl_oid *rack_hw_pacing;
rack_counters = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO,
"stats",
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Rack Counters");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "rate_sample_method", CTLFLAG_RW,
&rack_rate_sample_method , USE_RTT_LOW,
"What method should we use for rate sampling 0=high, 1=low ");
rack_probertt = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO,
"probertt",
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"ProbeRTT related Controls");
SYSCTL_ADD_U16(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "exit_per_hpb", CTLFLAG_RW,
&rack_atexit_prtt_hbp, 130,
"What percentage above goodput do we clamp CA/SS to at exit on high-BDP path 110%");
SYSCTL_ADD_U16(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "exit_per_nonhpb", CTLFLAG_RW,
&rack_atexit_prtt, 130,
"What percentage above goodput do we clamp CA/SS to at exit on a non high-BDP path 100%");
SYSCTL_ADD_U16(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "gp_per_mul", CTLFLAG_RW,
&rack_per_of_gp_probertt, 60,
"What percentage of goodput do we pace at in probertt");
SYSCTL_ADD_U16(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "gp_per_reduce", CTLFLAG_RW,
&rack_per_of_gp_probertt_reduce, 10,
"What percentage of goodput do we reduce every gp_srtt");
SYSCTL_ADD_U16(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "gp_per_low", CTLFLAG_RW,
&rack_per_of_gp_lowthresh, 40,
"What percentage of goodput do we allow the multiplier to fall to");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "time_between", CTLFLAG_RW,
&rack_time_between_probertt, 96000000,
"How many useconds between the lowest rtt falling must past before we enter probertt");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "safety", CTLFLAG_RW,
&rack_probe_rtt_safety_val, 2000000,
"If not zero, provides a maximum usecond that you can stay in probertt (2sec = 2000000)");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "sets_cwnd", CTLFLAG_RW,
&rack_probe_rtt_sets_cwnd, 0,
"Do we set the cwnd too (if always_lower is on)");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "maxdrainsrtts", CTLFLAG_RW,
&rack_max_drain_wait, 2,
"Maximum number of gp_srtt's to hold in drain waiting for flight to reach goal");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "mustdrainsrtts", CTLFLAG_RW,
&rack_must_drain, 1,
"We must drain this many gp_srtt's waiting for flight to reach goal");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "goal_use_min_entry", CTLFLAG_RW,
&rack_probertt_use_min_rtt_entry, 1,
"Should we use the min-rtt to calculate the goal rtt (else gp_srtt) at entry");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "goal_use_min_exit", CTLFLAG_RW,
&rack_probertt_use_min_rtt_exit, 0,
"How to set cwnd at exit, 0 - dynamic, 1 - use min-rtt, 2 - use curgprtt, 3 - entry gp-rtt");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "length_div", CTLFLAG_RW,
&rack_probertt_gpsrtt_cnt_div, 0,
"How many recent goodput srtt periods plus hold tim does probertt last (bottom of fraction)");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "length_mul", CTLFLAG_RW,
&rack_probertt_gpsrtt_cnt_mul, 0,
"How many recent goodput srtt periods plus hold tim does probertt last (top of fraction)");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "holdtim_at_target", CTLFLAG_RW,
&rack_min_probertt_hold, 200000,
"What is the minimum time we hold probertt at target");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "filter_life", CTLFLAG_RW,
&rack_probertt_filter_life, 10000000,
"What is the time for the filters life in useconds");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "lower_within", CTLFLAG_RW,
&rack_probertt_lower_within, 10,
"If the rtt goes lower within this percentage of the time, go into probe-rtt");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "must_move", CTLFLAG_RW,
&rack_min_rtt_movement, 250,
"How much is the minimum movement in rtt to count as a drop for probertt purposes");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "clear_is_cnts", CTLFLAG_RW,
&rack_probertt_clear_is, 1,
"Do we clear I/S counts on exiting probe-rtt");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "hbp_extra_drain", CTLFLAG_RW,
&rack_max_drain_hbp, 1,
"How many extra drain gpsrtt's do we get in highly buffered paths");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_probertt),
OID_AUTO, "hbp_threshold", CTLFLAG_RW,
&rack_hbp_thresh, 3,
"We are highly buffered if min_rtt_seen / max_rtt_seen > this-threshold");
rack_pacing = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO,
"pacing",
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Pacing related Controls");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "pcm_enabled", CTLFLAG_RW,
&rack_pcm_is_enabled, 1,
"Do we by default do PCM measurements?");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "pcm_rnds", CTLFLAG_RW,
&rack_pcm_every_n_rounds, 100,
"How many rounds before we need to do a PCM measurement");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "pcm_blast", CTLFLAG_RW,
&rack_pcm_blast, 0,
"Blast out the full cwnd/rwnd when doing a PCM measurement");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "rnd_gp_gain", CTLFLAG_RW,
&rack_gp_gain_req, 1200,
"How much do we have to increase the GP to record the round 1200 = 120.0");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "dgp_out_of_ss_at", CTLFLAG_RW,
&rack_rnd_cnt_req, 0x10005,
"How many rounds less than rnd_gp_gain will drop us out of SS");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "no_timely", CTLFLAG_RW,
&rack_timely_off, 0,
"Do we not use timely in DGP?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "fillcw", CTLFLAG_RW,
&rack_fill_cw_state, 0,
"Enable fillcw on new connections (default=0 off)?");
SYSCTL_ADD_U16(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "min_burst", CTLFLAG_RW,
&rack_pacing_min_seg, 0,
"What is the min burst size for pacing (0 disables)?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "divisor", CTLFLAG_RW,
&rack_default_pacing_divisor, 250,
"What is the default divisor given to the rl code?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "fillcw_max_mult", CTLFLAG_RW,
&rack_bw_multipler, 0,
"What is the limit multiplier of the current gp_est that fillcw can increase the b/w too, 200 == 200% (0 = off)?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "max_pace_over", CTLFLAG_RW,
&rack_max_per_above, 30,
"What is the maximum allowable percentage that we can pace above (so 30 = 130% of our goal)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "allow1mss", CTLFLAG_RW,
&rack_pace_one_seg, 0,
"Do we allow low b/w pacing of 1MSS instead of two (1.2Meg and less)?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "limit_wsrtt", CTLFLAG_RW,
&rack_limit_time_with_srtt, 0,
"Do we limit pacing time based on srtt");
SYSCTL_ADD_U16(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "gp_per_ss", CTLFLAG_RW,
&rack_per_of_gp_ss, 250,
"If non zero, what percentage of goodput to pace at in slow start");
SYSCTL_ADD_U16(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "gp_per_ca", CTLFLAG_RW,
&rack_per_of_gp_ca, 150,
"If non zero, what percentage of goodput to pace at in congestion avoidance");
SYSCTL_ADD_U16(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "gp_per_rec", CTLFLAG_RW,
&rack_per_of_gp_rec, 200,
"If non zero, what percentage of goodput to pace at in recovery");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "pace_max_seg", CTLFLAG_RW,
&rack_hptsi_segments, 40,
"What size is the max for TSO segments in pacing and burst mitigation");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "burst_reduces", CTLFLAG_RW,
&rack_pacing_delay_reduction, 4,
"When doing only burst mitigation what is the reduce divisor");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "use_pacing", CTLFLAG_RW,
&rack_pace_every_seg, 0,
"If set we use pacing, if clear we use only the original burst mitigation");
SYSCTL_ADD_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "rate_cap", CTLFLAG_RW,
&rack_bw_rate_cap, 0,
"If set we apply this value to the absolute rate cap used by pacing");
SYSCTL_ADD_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_pacing),
OID_AUTO, "fillcw_cap", CTLFLAG_RW,
&rack_fillcw_bw_cap, 3750000,
"Do we have an absolute cap on the amount of b/w fillcw can specify (0 = no)?");
SYSCTL_ADD_U8(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "req_measure_cnt", CTLFLAG_RW,
&rack_req_measurements, 1,
"If doing dynamic pacing, how many measurements must be in before we start pacing?");
rack_hw_pacing = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO,
"hdwr_pacing",
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Pacing related Controls");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_hw_pacing),
OID_AUTO, "rwnd_factor", CTLFLAG_RW,
&rack_hw_rwnd_factor, 2,
"How many times does snd_wnd need to be bigger than pace_max_seg so we will hold off and get more acks?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_hw_pacing),
OID_AUTO, "precheck", CTLFLAG_RW,
&rack_hw_check_queue, 0,
"Do we always precheck the hdwr pacing queue to avoid ENOBUF's?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_hw_pacing),
OID_AUTO, "pace_enobuf_mult", CTLFLAG_RW,
&rack_enobuf_hw_boost_mult, 0,
"By how many time_betweens should we boost the pacing time if we see a ENOBUFS?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_hw_pacing),
OID_AUTO, "pace_enobuf_max", CTLFLAG_RW,
&rack_enobuf_hw_max, 2,
"What is the max boost the pacing time if we see a ENOBUFS?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_hw_pacing),
OID_AUTO, "pace_enobuf_min", CTLFLAG_RW,
&rack_enobuf_hw_min, 2,
"What is the min boost the pacing time if we see a ENOBUFS?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_hw_pacing),
OID_AUTO, "enable", CTLFLAG_RW,
&rack_enable_hw_pacing, 0,
"Should RACK attempt to use hw pacing?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_hw_pacing),
OID_AUTO, "rate_cap", CTLFLAG_RW,
&rack_hw_rate_caps, 0,
"Does the highest hardware pacing rate cap the rate we will send at??");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_hw_pacing),
OID_AUTO, "uncap_per", CTLFLAG_RW,
&rack_hw_rate_cap_per, 0,
"If you go over b/w by this amount you will be uncapped (0 = never)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_hw_pacing),
OID_AUTO, "rate_min", CTLFLAG_RW,
&rack_hw_rate_min, 0,
"Do we need a minimum estimate of this many bytes per second in order to engage hw pacing?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_hw_pacing),
OID_AUTO, "rate_to_low", CTLFLAG_RW,
&rack_hw_rate_to_low, 0,
"If we fall below this rate, dis-engage hw pacing?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_hw_pacing),
OID_AUTO, "up_only", CTLFLAG_RW,
&rack_hw_up_only, 0,
"Do we allow hw pacing to lower the rate selected?");
rack_timely = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO,
"timely",
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Rack Timely RTT Controls");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "upper", CTLFLAG_RW,
&rack_gp_per_bw_mul_up, 2,
"Rack timely upper range for equal b/w (in percentage)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "lower", CTLFLAG_RW,
&rack_gp_per_bw_mul_down, 4,
"Rack timely lower range for equal b/w (in percentage)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "rtt_max_mul", CTLFLAG_RW,
&rack_gp_rtt_maxmul, 3,
"Rack timely multiplier of lowest rtt for rtt_max");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "rtt_min_div", CTLFLAG_RW,
&rack_gp_rtt_mindiv, 4,
"Rack timely divisor used for rtt + (rtt * mul/divisor) for check for lower rtt");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "rtt_min_mul", CTLFLAG_RW,
&rack_gp_rtt_minmul, 1,
"Rack timely multiplier used for rtt + (rtt * mul/divisor) for check for lower rtt");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "decrease", CTLFLAG_RW,
&rack_gp_decrease_per, 80,
"Rack timely Beta value 80 = .8 (scaled by 100)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "increase", CTLFLAG_RW,
&rack_gp_increase_per, 2,
"Rack timely increase perentage of our GP multiplication factor");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "lowerbound", CTLFLAG_RW,
&rack_per_lower_bound, 50,
"Rack timely lowest percentage we allow GP multiplier to fall to");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "p5_upper", CTLFLAG_RW,
&rack_gain_p5_ub, 250,
"Profile 5 upper bound to timely gain");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "upperboundss", CTLFLAG_RW,
&rack_per_upper_bound_ss, 0,
"Rack timely highest percentage we allow GP multiplier in SS to raise to (0 is no upperbound)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "upperboundca", CTLFLAG_RW,
&rack_per_upper_bound_ca, 0,
"Rack timely highest percentage we allow GP multiplier to CA raise to (0 is no upperbound)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "dynamicgp", CTLFLAG_RW,
&rack_do_dyn_mul, 0,
"Rack timely do we enable dynmaic timely goodput by default");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "no_rec_red", CTLFLAG_RW,
&rack_gp_no_rec_chg, 1,
"Rack timely do we prohibit the recovery multiplier from being lowered");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "red_clear_cnt", CTLFLAG_RW,
&rack_timely_dec_clear, 6,
"Rack timely what threshold do we count to before another boost during b/w decent");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "max_push_rise", CTLFLAG_RW,
&rack_timely_max_push_rise, 3,
"Rack timely how many times do we push up with b/w increase");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "max_push_drop", CTLFLAG_RW,
&rack_timely_max_push_drop, 3,
"Rack timely how many times do we push back on b/w decent");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "min_segs", CTLFLAG_RW,
&rack_timely_min_segs, 4,
"Rack timely when setting the cwnd what is the min num segments");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "nonstop", CTLFLAG_RW,
&rack_timely_no_stopping, 0,
"Rack timely don't stop increase");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "dec_raise_thresh", CTLFLAG_RW,
&rack_down_raise_thresh, 100,
"If the CA or SS is below this threshold raise on the first 3 b/w lowers (0=always)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timely),
OID_AUTO, "bottom_drag_segs", CTLFLAG_RW,
&rack_req_segs, 1,
"Bottom dragging if not these many segments outstanding and room");
rack_tlp = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO,
"tlp",
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"TLP and Rack related Controls");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "use_rrr", CTLFLAG_RW,
&use_rack_rr, 1,
"Do we use Rack Rapid Recovery");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "post_rec_labc", CTLFLAG_RW,
&rack_max_abc_post_recovery, 2,
"Since we do early recovery, do we override the l_abc to a value, if so what?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "nonrxt_use_cr", CTLFLAG_RW,
&rack_non_rxt_use_cr, 0,
"Do we use ss/ca rate if in recovery we are transmitting a new data chunk");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "tlpmethod", CTLFLAG_RW,
&rack_tlp_threshold_use, TLP_USE_TWO_ONE,
"What method do we do for TLP time calc 0=no-de-ack-comp, 1=ID, 2=2.1, 3=2.2");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "limit", CTLFLAG_RW,
&rack_tlp_limit, 2,
"How many TLP's can be sent without sending new data");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "use_greater", CTLFLAG_RW,
&rack_tlp_use_greater, 1,
"Should we use the rack_rtt time if its greater than srtt");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "tlpminto", CTLFLAG_RW,
&rack_tlp_min, 10000,
"TLP minimum timeout per the specification (in microseconds)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "send_oldest", CTLFLAG_RW,
&rack_always_send_oldest, 0,
"Should we always send the oldest TLP and RACK-TLP");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "tlp_cwnd_flag", CTLFLAG_RW,
&rack_lower_cwnd_at_tlp, 0,
"When a TLP completes a retran should we enter recovery");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "reorder_thresh", CTLFLAG_RW,
&rack_reorder_thresh, 2,
"What factor for rack will be added when seeing reordering (shift right)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "rtt_tlp_thresh", CTLFLAG_RW,
&rack_tlp_thresh, 1,
"What divisor for TLP rtt/retran will be added (1=rtt, 2=1/2 rtt etc)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "reorder_fade", CTLFLAG_RW,
&rack_reorder_fade, 60000000,
"Does reorder detection fade, if so how many microseconds (0 means never)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "pktdelay", CTLFLAG_RW,
&rack_pkt_delay, 1000,
"Extra RACK time (in microseconds) besides reordering thresh");
rack_timers = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO,
"timers",
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Timer related controls");
SYSCTL_ADD_U8(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "reset_ssth_rec_rto", CTLFLAG_RW,
&rack_ssthresh_rest_rto_rec, 0,
"When doing recovery -> rto -> recovery do we reset SSthresh?");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "rtt_divisor", CTLFLAG_RW,
&rack_rtt_divisor, 2,
"When calculating the rtt threshold what 1/N is a rtt that indicates reordering");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "scoreboard_thresh", CTLFLAG_RW,
&rack_rxt_scoreboard_clear_thresh, 2,
"How many RTO's are allowed before we clear the scoreboard");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "honor_hpts_min", CTLFLAG_RW,
&rack_honors_hpts_min_to, 1,
"Do rack pacing timers honor hpts min timeout");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "hpts_max_reduce", CTLFLAG_RW,
&rack_max_reduce, 10,
"Max percentage we will reduce pacing delay by for pacing when we are behind");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "persmin", CTLFLAG_RW,
&rack_persist_min, 250000,
"What is the minimum time in microseconds between persists");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "persmax", CTLFLAG_RW,
&rack_persist_max, 2000000,
"What is the largest delay in microseconds between persists");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "delayed_ack", CTLFLAG_RW,
&rack_delayed_ack_time, 40000,
"Delayed ack time (40ms in microseconds)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "minrto", CTLFLAG_RW,
&rack_rto_min, 30000,
"Minimum RTO in microseconds -- set with caution below 1000 due to TLP");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "maxrto", CTLFLAG_RW,
&rack_rto_max, 4000000,
"Maximum RTO in microseconds -- should be at least as large as min_rto");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "minto", CTLFLAG_RW,
&rack_min_to, 1000,
"Minimum rack timeout in microseconds");
rack_measure = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO,
"measure",
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Measure related controls");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_measure),
OID_AUTO, "wma_divisor", CTLFLAG_RW,
&rack_wma_divisor, 8,
"When doing b/w calculation what is the divisor for the WMA");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_measure),
OID_AUTO, "end_cwnd", CTLFLAG_RW,
&rack_cwnd_block_ends_measure, 0,
"Does a cwnd just-return end the measurement window (app limited)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_measure),
OID_AUTO, "end_rwnd", CTLFLAG_RW,
&rack_rwnd_block_ends_measure, 0,
"Does an rwnd just-return end the measurement window (app limited -- not persists)");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_measure),
OID_AUTO, "min_target", CTLFLAG_RW,
&rack_def_data_window, 20,
"What is the minimum target window (in mss) for a GP measurements");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_measure),
OID_AUTO, "goal_bdp", CTLFLAG_RW,
&rack_goal_bdp, 2,
"What is the goal BDP to measure");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_measure),
OID_AUTO, "min_srtts", CTLFLAG_RW,
&rack_min_srtts, 1,
"What is the goal BDP to measure");
SYSCTL_ADD_U32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_measure),
OID_AUTO, "min_measure_tim", CTLFLAG_RW,
&rack_min_measure_usec, 0,
"What is the Minimum time time for a measurement if 0, this is off");
rack_features = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO,
"features",
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Feature controls");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_features),
OID_AUTO, "hybrid_set_maxseg", CTLFLAG_RW,
&rack_hybrid_allow_set_maxseg, 0,
"Should hybrid pacing allow the setmss command");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_features),
OID_AUTO, "cmpack", CTLFLAG_RW,
&rack_use_cmp_acks, 1,
"Should RACK have LRO send compressed acks");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_features),
OID_AUTO, "fsb", CTLFLAG_RW,
&rack_use_fsb, 1,
"Should RACK use the fast send block?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_features),
OID_AUTO, "rfo", CTLFLAG_RW,
&rack_use_rfo, 1,
"Should RACK use rack_fast_output()?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_features),
OID_AUTO, "rsmrfo", CTLFLAG_RW,
&rack_use_rsm_rfo, 1,
"Should RACK use rack_fast_rsm_output()?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_features),
OID_AUTO, "non_paced_lro_queue", CTLFLAG_RW,
&rack_enable_mqueue_for_nonpaced, 0,
"Should RACK use mbuf queuing for non-paced connections");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_features),
OID_AUTO, "hystartplusplus", CTLFLAG_RW,
&rack_do_hystart, 0,
"Should RACK enable HyStart++ on connections?");
rack_misc = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO,
"misc",
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Misc related controls");
#ifdef TCP_ACCOUNTING
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "tcp_acct", CTLFLAG_RW,
&rack_tcp_accounting, 0,
"Should we turn on TCP accounting for all rack sessions?");
#endif
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "dnd", CTLFLAG_RW,
&rack_dnd_default, 0,
"Do not disturb default for rack_rrr = 3");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "rxt_controls", CTLFLAG_RW,
&rack_rxt_controls, 0,
"Retransmit sending size controls (valid values 0, 1, 2 default=1)?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "rack_hibeta", CTLFLAG_RW,
&rack_hibeta_setting, 0,
"Do we ue a high beta (80 instead of 50)?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "apply_rtt_with_low_conf", CTLFLAG_RW,
&rack_apply_rtt_with_reduced_conf, 0,
"When a persist or keep-alive probe is not answered do we calculate rtt on subsequent answers?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "rack_dsack_ctl", CTLFLAG_RW,
&rack_dsack_std_based, 3,
"How do we process dsack with respect to rack timers, bit field, 3 is standards based?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "prr_addback_max", CTLFLAG_RW,
&rack_prr_addbackmax, 2,
"What is the maximum number of MSS we allow to be added back if prr can't send all its data?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "stats_gets_ms", CTLFLAG_RW,
&rack_stats_gets_ms_rtt, 1,
"What do we feed the stats framework (1 = ms_rtt, 0 = us_rtt, 2 = ms_rtt from hdwr, > 2 usec rtt from hdwr)?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "clientlowbuf", CTLFLAG_RW,
&rack_client_low_buf, 0,
"Client low buffer level (below this we are more aggressive in DGP exiting recovery (0 = off)?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "defprofile", CTLFLAG_RW,
&rack_def_profile, 0,
"Should RACK use a default profile (0=no, num == profile num)?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "shared_cwnd", CTLFLAG_RW,
&rack_enable_shared_cwnd, 1,
"Should RACK try to use the shared cwnd on connections where allowed");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "limits_on_scwnd", CTLFLAG_RW,
&rack_limits_scwnd, 1,
"Should RACK place low end time limits on the shared cwnd feature");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "no_prr", CTLFLAG_RW,
&rack_disable_prr, 0,
"Should RACK not use prr and only pace (must have pacing on)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "bb_verbose", CTLFLAG_RW,
&rack_verbose_logging, 0,
"Should RACK black box logging be verbose");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "data_after_close", CTLFLAG_RW,
&rack_ignore_data_after_close, 1,
"Do we hold off sending a RST until all pending data is ack'd");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "no_sack_needed", CTLFLAG_RW,
&rack_sack_not_required, 1,
"Do we allow rack to run on connections not supporting SACK");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "prr_sendalot", CTLFLAG_RW,
&rack_send_a_lot_in_prr, 1,
"Send a lot in prr");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "autoscale", CTLFLAG_RW,
&rack_autosndbuf_inc, 20,
"What percentage should rack scale up its snd buffer by?");
rack_total_bytes = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "totalbytes", CTLFLAG_RD,
&rack_total_bytes,
"Total number of bytes sent");
rack_fto_send = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "fto_send", CTLFLAG_RD,
&rack_fto_send, "Total number of rack_fast_output sends");
rack_fto_rsm_send = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "fto_rsm_send", CTLFLAG_RD,
&rack_fto_rsm_send, "Total number of rack_fast_rsm_output sends");
rack_nfto_resend = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "nfto_resend", CTLFLAG_RD,
&rack_nfto_resend, "Total number of rack_output retransmissions");
rack_non_fto_send = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "nfto_send", CTLFLAG_RD,
&rack_non_fto_send, "Total number of rack_output first sends");
rack_extended_rfo = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "rfo_extended", CTLFLAG_RD,
&rack_extended_rfo, "Total number of times we extended rfo");
rack_hw_pace_init_fail = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "hwpace_init_fail", CTLFLAG_RD,
&rack_hw_pace_init_fail, "Total number of times we failed to initialize hw pacing");
rack_hw_pace_lost = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "hwpace_lost", CTLFLAG_RD,
&rack_hw_pace_lost, "Total number of times we failed to initialize hw pacing");
rack_tlp_tot = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tlp_to_total", CTLFLAG_RD,
&rack_tlp_tot,
"Total number of tail loss probe expirations");
rack_tlp_newdata = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tlp_new", CTLFLAG_RD,
&rack_tlp_newdata,
"Total number of tail loss probe sending new data");
rack_tlp_retran = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tlp_retran", CTLFLAG_RD,
&rack_tlp_retran,
"Total number of tail loss probe sending retransmitted data");
rack_tlp_retran_bytes = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tlp_retran_bytes", CTLFLAG_RD,
&rack_tlp_retran_bytes,
"Total bytes of tail loss probe sending retransmitted data");
rack_to_tot = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "rack_to_tot", CTLFLAG_RD,
&rack_to_tot,
"Total number of times the rack to expired");
rack_saw_enobuf = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "saw_enobufs", CTLFLAG_RD,
&rack_saw_enobuf,
"Total number of times a sends returned enobuf for non-hdwr paced connections");
rack_saw_enobuf_hw = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "saw_enobufs_hw", CTLFLAG_RD,
&rack_saw_enobuf_hw,
"Total number of times a send returned enobuf for hdwr paced connections");
rack_saw_enetunreach = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "saw_enetunreach", CTLFLAG_RD,
&rack_saw_enetunreach,
"Total number of times a send received a enetunreachable");
rack_hot_alloc = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "alloc_hot", CTLFLAG_RD,
&rack_hot_alloc,
"Total allocations from the top of our list");
rack_to_alloc = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "allocs", CTLFLAG_RD,
&rack_to_alloc,
"Total allocations of tracking structures");
rack_to_alloc_hard = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "allochard", CTLFLAG_RD,
&rack_to_alloc_hard,
"Total allocations done with sleeping the hard way");
rack_to_alloc_emerg = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "allocemerg", CTLFLAG_RD,
&rack_to_alloc_emerg,
"Total allocations done from emergency cache");
rack_to_alloc_limited = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "alloc_limited", CTLFLAG_RD,
&rack_to_alloc_limited,
"Total allocations dropped due to limit");
rack_alloc_limited_conns = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "alloc_limited_conns", CTLFLAG_RD,
&rack_alloc_limited_conns,
"Connections with allocations dropped due to limit");
rack_split_limited = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "split_limited", CTLFLAG_RD,
&rack_split_limited,
"Split allocations dropped due to limit");
rack_rxt_clamps_cwnd = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "rxt_clamps_cwnd", CTLFLAG_RD,
&rack_rxt_clamps_cwnd,
"Number of times that excessive rxt clamped the cwnd down");
rack_rxt_clamps_cwnd_uniq = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "rxt_clamps_cwnd_uniq", CTLFLAG_RD,
&rack_rxt_clamps_cwnd_uniq,
"Number of connections that have had excessive rxt clamped the cwnd down");
rack_persists_sends = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "persist_sends", CTLFLAG_RD,
&rack_persists_sends,
"Number of times we sent a persist probe");
rack_persists_acks = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "persist_acks", CTLFLAG_RD,
&rack_persists_acks,
"Number of times a persist probe was acked");
rack_persists_loss = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "persist_loss", CTLFLAG_RD,
&rack_persists_loss,
"Number of times we detected a lost persist probe (no ack)");
rack_persists_lost_ends = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "persist_loss_ends", CTLFLAG_RD,
&rack_persists_lost_ends,
"Number of lost persist probe (no ack) that the run ended with a PERSIST abort");
#ifdef INVARIANTS
rack_adjust_map_bw = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "map_adjust_req", CTLFLAG_RD,
&rack_adjust_map_bw,
"Number of times we hit the case where the sb went up and down on a sendmap entry");
#endif
rack_multi_single_eq = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "cmp_ack_equiv", CTLFLAG_RD,
&rack_multi_single_eq,
"Number of compressed acks total represented");
rack_proc_non_comp_ack = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "cmp_ack_not", CTLFLAG_RD,
&rack_proc_non_comp_ack,
"Number of non compresseds acks that we processed");
rack_sack_proc_all = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "sack_long", CTLFLAG_RD,
&rack_sack_proc_all,
"Total times we had to walk whole list for sack processing");
rack_sack_proc_restart = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "sack_restart", CTLFLAG_RD,
&rack_sack_proc_restart,
"Total times we had to walk whole list due to a restart");
rack_sack_proc_short = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "sack_short", CTLFLAG_RD,
&rack_sack_proc_short,
"Total times we took shortcut for sack processing");
rack_input_idle_reduces = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "idle_reduce_oninput", CTLFLAG_RD,
&rack_input_idle_reduces,
"Total number of idle reductions on input");
rack_collapsed_win_seen = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "collapsed_win_seen", CTLFLAG_RD,
&rack_collapsed_win_seen,
"Total number of collapsed window events seen (where our window shrinks)");
rack_collapsed_win = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "collapsed_win", CTLFLAG_RD,
&rack_collapsed_win,
"Total number of collapsed window events where we mark packets");
rack_collapsed_win_rxt = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "collapsed_win_rxt", CTLFLAG_RD,
&rack_collapsed_win_rxt,
"Total number of packets that were retransmitted");
rack_collapsed_win_rxt_bytes = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "collapsed_win_bytes", CTLFLAG_RD,
&rack_collapsed_win_rxt_bytes,
"Total number of bytes that were retransmitted");
rack_try_scwnd = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tried_scwnd", CTLFLAG_RD,
&rack_try_scwnd,
"Total number of scwnd attempts");
COUNTER_ARRAY_ALLOC(rack_out_size, TCP_MSS_ACCT_SIZE, M_WAITOK);
SYSCTL_ADD_COUNTER_U64_ARRAY(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "outsize", CTLFLAG_RD,
rack_out_size, TCP_MSS_ACCT_SIZE, "MSS send sizes");
COUNTER_ARRAY_ALLOC(rack_opts_arry, RACK_OPTS_SIZE, M_WAITOK);
SYSCTL_ADD_COUNTER_U64_ARRAY(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "opts", CTLFLAG_RD,
rack_opts_arry, RACK_OPTS_SIZE, "RACK Option Stats");
SYSCTL_ADD_PROC(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "clear", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&rack_clear_counter, 0, sysctl_rack_clear, "IU", "Clear counters");
}
static uint32_t
rc_init_window(struct tcp_rack *rack)
{
return (tcp_compute_initwnd(tcp_maxseg(rack->rc_tp)));
}
static uint64_t
rack_get_fixed_pacing_bw(struct tcp_rack *rack)
{
if (IN_FASTRECOVERY(rack->rc_tp->t_flags))
return (rack->r_ctl.rc_fixed_pacing_rate_rec);
else if (rack->r_ctl.cwnd_to_use < rack->rc_tp->snd_ssthresh)
return (rack->r_ctl.rc_fixed_pacing_rate_ss);
else
return (rack->r_ctl.rc_fixed_pacing_rate_ca);
}
static void
rack_log_hybrid_bw(struct tcp_rack *rack, uint32_t seq, uint64_t cbw, uint64_t tim,
uint64_t data, uint8_t mod, uint16_t aux,
struct tcp_sendfile_track *cur, int line)
{
#ifdef TCP_REQUEST_TRK
int do_log = 0;
if ((mod == HYBRID_LOG_RATE_CAP) || (mod == HYBRID_LOG_CAP_CALC)) {
if (rack_verbose_logging != 0)
do_log = tcp_bblogging_on(rack->rc_tp);
else
do_log = 0;
} else if (mod != HYBRID_LOG_BW_MEASURE) {
do_log = tcp_bblogging_on(rack->rc_tp);
} else {
do_log = tcp_bblogging_point_on(rack->rc_tp, TCP_BBPOINT_REQ_LEVEL_LOGGING);
}
if (do_log) {
union tcp_log_stackspecific log;
struct timeval tv;
uint64_t lt_bw;
memset(&log, 0, sizeof(log));
log.u_bbr.cwnd_gain = line;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.rttProp = tim;
log.u_bbr.bw_inuse = cbw;
log.u_bbr.delRate = rack_get_gp_est(rack);
lt_bw = rack_get_lt_bw(rack);
log.u_bbr.flex1 = seq;
log.u_bbr.pacing_gain = aux;
log.u_bbr.flex2 = (uint32_t)(lt_bw & 0x00000000ffffffff);
log.u_bbr.flex3 = (uint32_t)((lt_bw >> 32) & 0x00000000ffffffff);
if (cur == NULL) {
cur = rack->r_ctl.rc_last_sft;
}
if (rack->r_ctl.rack_rs.rs_flags != RACK_RTT_EMPTY)
log.u_bbr.inflight = rack->r_ctl.rack_rs.rs_us_rtt;
else {
log.u_bbr.inflight = rack->rc_rack_rtt;
}
if (cur != NULL) {
uint64_t off;
log.u_bbr.cur_del_rate = cur->deadline;
if ((mod == HYBRID_LOG_RATE_CAP) || (mod == HYBRID_LOG_CAP_CALC)) {
log.u_bbr.pkt_epoch = (uint32_t)(cur->start & 0x00000000ffffffff);
log.u_bbr.lost = (uint32_t)((cur->start >> 32) & 0x00000000ffffffff);
log.u_bbr.flex6 = cur->start_seq;
log.u_bbr.pkts_out = cur->end_seq;
} else {
log.u_bbr.pkt_epoch = (uint32_t)(cur->start & 0x00000000ffffffff);
log.u_bbr.lost = (uint32_t)((cur->start >> 32) & 0x00000000ffffffff);
log.u_bbr.flex6 = (uint32_t)(cur->end & 0x00000000ffffffff);
log.u_bbr.pkts_out = (uint32_t)((cur->end >> 32) & 0x00000000ffffffff);
}
log.u_bbr.epoch = (uint32_t)(cur->first_send & 0x00000000ffffffff);
log.u_bbr.lt_epoch = (uint32_t)((cur->first_send >> 32) & 0x00000000ffffffff);
log.u_bbr.applimited = (uint32_t)(cur->localtime & 0x00000000ffffffff);
log.u_bbr.delivered = (uint32_t)((cur->localtime >> 32) & 0x00000000ffffffff);
#ifdef TCP_REQUEST_TRK
off = (uint64_t)(cur) - (uint64_t)(&rack->rc_tp->t_tcpreq_info[0]);
log.u_bbr.bbr_substate = (uint8_t)(off / sizeof(struct tcp_sendfile_track));
#endif
log.u_bbr.inhpts = 1;
log.u_bbr.flex4 = (uint32_t)(rack->rc_tp->t_sndbytes - cur->sent_at_fs);
log.u_bbr.flex5 = (uint32_t)(rack->rc_tp->t_snd_rxt_bytes - cur->rxt_at_fs);
log.u_bbr.flex7 = (uint16_t)cur->hybrid_flags;
} else {
log.u_bbr.flex7 = 0xffff;
log.u_bbr.cur_del_rate = 0xffffffffffffffff;
}
log.u_bbr.bbr_state = rack->rc_always_pace;
log.u_bbr.bbr_state <<= 1;
log.u_bbr.bbr_state |= rack->dgp_on;
log.u_bbr.bbr_state <<= 1;
log.u_bbr.bbr_state |= rack->rc_hybrid_mode;
log.u_bbr.bbr_state <<= 1;
log.u_bbr.bbr_state |= rack->use_fixed_rate;
log.u_bbr.flex8 = mod;
tcp_log_event(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
TCP_HYBRID_PACING_LOG, 0,
0, &log, false, NULL, __func__, __LINE__, &tv);
}
#endif
}
#ifdef TCP_REQUEST_TRK
static void
rack_log_hybrid_sends(struct tcp_rack *rack, struct tcp_sendfile_track *cur, int line)
{
if (tcp_bblogging_point_on(rack->rc_tp, TCP_BBPOINT_REQ_LEVEL_LOGGING)) {
union tcp_log_stackspecific log;
struct timeval tv;
uint64_t off;
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.delRate = cur->sent_at_fs;
if ((cur->flags & TCP_TRK_TRACK_FLG_LSND) == 0) {
log.u_bbr.cur_del_rate = rack->rc_tp->t_sndbytes;
log.u_bbr.rttProp = rack->rc_tp->t_snd_rxt_bytes;
} else {
log.u_bbr.cur_del_rate = cur->sent_at_ls;
log.u_bbr.rttProp = cur->rxt_at_ls;
}
log.u_bbr.bw_inuse = cur->rxt_at_fs;
log.u_bbr.cwnd_gain = line;
off = (uint64_t)(cur) - (uint64_t)(&rack->rc_tp->t_tcpreq_info[0]);
log.u_bbr.bbr_substate = (uint8_t)(off / sizeof(struct tcp_sendfile_track));
log.u_bbr.flex2 = (uint32_t)(cur->start & 0x00000000ffffffff);
log.u_bbr.flex1 = (uint32_t)((cur->start >> 32) & 0x00000000ffffffff);
log.u_bbr.flex4 = (uint32_t)(cur->end & 0x00000000ffffffff);
log.u_bbr.flex3 = (uint32_t)((cur->end >> 32) & 0x00000000ffffffff);
log.u_bbr.applimited = (uint32_t)(cur->localtime & 0x00000000ffffffff);
log.u_bbr.delivered = (uint32_t)((cur->localtime >> 32) & 0x00000000ffffffff);
log.u_bbr.epoch = (uint32_t)(cur->timestamp & 0x00000000ffffffff);
log.u_bbr.lt_epoch = (uint32_t)((cur->timestamp >> 32) & 0x00000000ffffffff);
log.u_bbr.pkts_out = cur->hybrid_flags;
log.u_bbr.lost = cur->playout_ms;
log.u_bbr.flex6 = cur->flags;
log.u_bbr.pkt_epoch = (uint32_t)(rack->r_ctl.last_tmit_time_acked & 0x00000000ffffffff);
log.u_bbr.flex5 = (uint32_t)((rack->r_ctl.last_tmit_time_acked >> 32) & 0x00000000ffffffff);
log.u_bbr.bbr_state = rack->rc_always_pace;
log.u_bbr.bbr_state <<= 1;
log.u_bbr.bbr_state |= rack->dgp_on;
log.u_bbr.bbr_state <<= 1;
log.u_bbr.bbr_state |= rack->rc_hybrid_mode;
log.u_bbr.bbr_state <<= 1;
log.u_bbr.bbr_state |= rack->use_fixed_rate;
log.u_bbr.flex8 = HYBRID_LOG_SENT_LOST;
tcp_log_event(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
TCP_HYBRID_PACING_LOG, 0,
0, &log, false, NULL, __func__, __LINE__, &tv);
}
}
#endif
static inline uint64_t
rack_compensate_for_linerate(struct tcp_rack *rack, uint64_t bw)
{
uint64_t ret_bw, ether;
uint64_t u_segsiz;
ether = rack->rc_tp->t_maxseg + sizeof(struct tcphdr);
if (rack->r_is_v6){
#ifdef INET6
ether += sizeof(struct ip6_hdr);
#endif
ether += 14;
} else {
#ifdef INET
ether += sizeof(struct ip);
#endif
ether += 14;
}
u_segsiz = (uint64_t)min(ctf_fixed_maxseg(rack->rc_tp), rack->r_ctl.rc_pace_min_segs);
ret_bw = bw;
ret_bw *= ether;
ret_bw /= u_segsiz;
return (ret_bw);
}
static void
rack_rate_cap_bw(struct tcp_rack *rack, uint64_t *bw, int *capped)
{
#ifdef TCP_REQUEST_TRK
struct timeval tv;
uint64_t timenow, timeleft, lenleft, lengone, calcbw;
#endif
if (rack->r_ctl.bw_rate_cap == 0)
return;
#ifdef TCP_REQUEST_TRK
if (rack->rc_catch_up && rack->rc_hybrid_mode &&
(rack->r_ctl.rc_last_sft != NULL)) {
struct tcp_sendfile_track *ent;
ent = rack->r_ctl.rc_last_sft;
microuptime(&tv);
timenow = tcp_tv_to_lusec(&tv);
if (timenow >= ent->deadline) {
rack_log_hybrid_bw(rack, rack->rc_tp->snd_max,
0, 0, 0, HYBRID_LOG_OUTOFTIME, 0, ent, __LINE__);
rack->r_ctl.bw_rate_cap = 0;
return;
}
timeleft = rack->r_ctl.rc_last_sft->deadline - timenow;
if (timeleft < HPTS_MSEC_IN_SEC) {
rack_log_hybrid_bw(rack, rack->rc_tp->snd_max,
0, timeleft, 0, HYBRID_LOG_OUTOFTIME, 0, ent, __LINE__);
rack->r_ctl.bw_rate_cap = 0;
return;
}
if (ent->flags & TCP_TRK_TRACK_FLG_COMP) {
if (SEQ_GT(ent->end_seq, rack->rc_tp->snd_una))
lenleft = ent->end_seq - rack->rc_tp->snd_una;
else {
rack_log_hybrid_bw(rack, rack->rc_tp->snd_max,
0, timeleft, 0, HYBRID_LOG_CAPERROR, 0, ent, __LINE__);
rack->r_ctl.bw_rate_cap = 0;
return;
}
} else {
if (SEQ_GT(rack->rc_tp->snd_una, ent->start_seq))
lengone = rack->rc_tp->snd_una - ent->start_seq;
else
lengone = 0;
if (lengone < (ent->end - ent->start))
lenleft = (ent->end - ent->start) - lengone;
else {
rack_log_hybrid_bw(rack, rack->rc_tp->snd_max,
0, timeleft, lengone, HYBRID_LOG_CAPERROR, 0, ent, __LINE__);
rack->r_ctl.bw_rate_cap = 0;
return;
}
}
if (lenleft == 0) {
rack_log_hybrid_bw(rack, rack->rc_tp->snd_max,
0, timeleft, lenleft, HYBRID_LOG_ALLSENT, 0, ent, __LINE__);
if (rack->r_ctl.bw_rate_cap)
goto normal_ratecap;
else
return;
}
calcbw = lenleft * HPTS_USEC_IN_SEC;
calcbw /= timeleft;
calcbw = rack_compensate_for_linerate(rack, calcbw);
rack->r_ctl.bw_rate_cap = calcbw;
if ((rack->r_ctl.rc_last_sft->hybrid_flags & TCP_HYBRID_PACING_S_MSS) &&
(rack_hybrid_allow_set_maxseg == 1) &&
((rack->r_ctl.rc_last_sft->hybrid_flags & TCP_HYBRID_PACING_SETMSS) == 0)) {
uint32_t orig_max;
orig_max = rack->r_ctl.rc_pace_max_segs;
rack->r_ctl.rc_last_sft->hybrid_flags |= TCP_HYBRID_PACING_SETMSS;
rack->r_ctl.rc_pace_max_segs = rack_get_pacing_len(rack, calcbw, ctf_fixed_maxseg(rack->rc_tp));
rack_log_type_pacing_sizes(rack->rc_tp, rack, rack->r_ctl.client_suggested_maxseg, orig_max, __LINE__, 5);
}
rack_log_hybrid_bw(rack, rack->rc_tp->snd_max,
calcbw, timeleft, lenleft, HYBRID_LOG_CAP_CALC, 0, ent, __LINE__);
if ((calcbw > 0) && (*bw > calcbw)) {
rack_log_hybrid_bw(rack, rack->rc_tp->snd_max,
*bw, ent->deadline, lenleft, HYBRID_LOG_RATE_CAP, 0, ent, __LINE__);
*capped = 1;
*bw = calcbw;
}
return;
}
normal_ratecap:
#endif
if ((rack->r_ctl.bw_rate_cap > 0) && (*bw > rack->r_ctl.bw_rate_cap)) {
#ifdef TCP_REQUEST_TRK
if (rack->rc_hybrid_mode &&
rack->rc_catch_up &&
(rack->r_ctl.rc_last_sft != NULL) &&
(rack->r_ctl.rc_last_sft->hybrid_flags & TCP_HYBRID_PACING_S_MSS) &&
(rack_hybrid_allow_set_maxseg == 1) &&
((rack->r_ctl.rc_last_sft->hybrid_flags & TCP_HYBRID_PACING_SETMSS) == 0)) {
uint32_t orig_max;
orig_max = rack->r_ctl.rc_pace_max_segs;
rack->r_ctl.rc_last_sft->hybrid_flags |= TCP_HYBRID_PACING_SETMSS;
rack->r_ctl.rc_pace_max_segs = rack_get_pacing_len(rack, rack->r_ctl.bw_rate_cap, ctf_fixed_maxseg(rack->rc_tp));
rack_log_type_pacing_sizes(rack->rc_tp, rack, rack->r_ctl.client_suggested_maxseg, orig_max, __LINE__, 5);
}
#endif
*capped = 1;
*bw = rack->r_ctl.bw_rate_cap;
rack_log_hybrid_bw(rack, rack->rc_tp->snd_max,
*bw, 0, 0,
HYBRID_LOG_RATE_CAP, 1, NULL, __LINE__);
}
}
static uint64_t
rack_get_gp_est(struct tcp_rack *rack)
{
uint64_t bw, lt_bw, ret_bw;
if (rack->rc_gp_filled == 0) {
uint64_t srtt;
if (rack->dis_lt_bw == 1)
lt_bw = 0;
else
lt_bw = rack_get_lt_bw(rack);
if (lt_bw) {
ret_bw = lt_bw;
goto compensate;
}
if (rack->r_ctl.init_rate)
return (rack->r_ctl.init_rate);
if (rack->rc_tp->t_srtt == 0) {
return (0);
}
bw = tcp_compute_initwnd(tcp_maxseg(rack->rc_tp));
srtt = (uint64_t)rack->rc_tp->t_srtt;
bw *= (uint64_t)USECS_IN_SECOND;
bw /= srtt;
ret_bw = bw;
goto compensate;
}
if (rack->r_ctl.num_measurements >= RACK_REQ_AVG) {
bw = rack->r_ctl.gp_bw;
} else {
bw = rack->r_ctl.gp_bw / max(rack->r_ctl.num_measurements, 1);
}
if (rack->dis_lt_bw) {
ret_bw = bw;
goto compensate;
}
lt_bw = rack_get_lt_bw(rack);
if (lt_bw == 0) {
lt_bw = rack->r_ctl.gp_bw;
}
if (rack->use_lesser_lt_bw) {
if (lt_bw < bw)
ret_bw = lt_bw;
else
ret_bw = bw;
} else {
if (lt_bw > bw)
ret_bw = lt_bw;
else
ret_bw = bw;
}
compensate:
ret_bw = rack_compensate_for_linerate(rack, ret_bw);
return(ret_bw);
}
static uint64_t
rack_get_bw(struct tcp_rack *rack)
{
uint64_t bw;
if (rack->use_fixed_rate) {
return (rack_get_fixed_pacing_bw(rack));
}
bw = rack_get_gp_est(rack);
return (bw);
}
static uint16_t
rack_get_output_gain(struct tcp_rack *rack, struct rack_sendmap *rsm)
{
if (rack->use_fixed_rate) {
return (100);
} else if (rack->in_probe_rtt && (rsm == NULL))
return (rack->r_ctl.rack_per_of_gp_probertt);
else if ((IN_FASTRECOVERY(rack->rc_tp->t_flags) &&
rack->r_ctl.rack_per_of_gp_rec)) {
if (rsm) {
return (rack->r_ctl.rack_per_of_gp_rec);
} else if (rack->rack_rec_nonrxt_use_cr) {
goto configured_rate;
} else if (rack->rack_no_prr &&
(rack->r_ctl.rack_per_of_gp_rec > 100)) {
return (100);
} else {
return (rack->r_ctl.rack_per_of_gp_rec);
}
}
configured_rate:
if (rack->r_ctl.cwnd_to_use < rack->rc_tp->snd_ssthresh)
return (rack->r_ctl.rack_per_of_gp_ss);
else
return (rack->r_ctl.rack_per_of_gp_ca);
}
static void
rack_log_dsack_event(struct tcp_rack *rack, uint8_t mod, uint32_t flex4, uint32_t flex5, uint32_t flex6)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = rack->rc_rack_tmr_std_based;
log.u_bbr.flex1 <<= 1;
log.u_bbr.flex1 |= rack->rc_rack_use_dsack;
log.u_bbr.flex1 <<= 1;
log.u_bbr.flex1 |= rack->rc_dsack_round_seen;
log.u_bbr.flex2 = rack->r_ctl.dsack_round_end;
log.u_bbr.flex3 = rack->r_ctl.num_dsack;
log.u_bbr.flex4 = flex4;
log.u_bbr.flex5 = flex5;
log.u_bbr.flex6 = flex6;
log.u_bbr.flex7 = rack->r_ctl.dsack_persist;
log.u_bbr.flex8 = mod;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.epoch = rack->r_ctl.current_round;
log.u_bbr.lt_epoch = rack->r_ctl.rc_considered_lost;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
RACK_DSACK_HANDLING, 0,
0, &log, false, &tv);
}
}
static void
rack_log_hdwr_pacing(struct tcp_rack *rack,
uint64_t rate, uint64_t hw_rate, int line,
int error, uint16_t mod)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
const struct ifnet *ifp;
uint64_t ifp64;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = ((hw_rate >> 32) & 0x00000000ffffffff);
log.u_bbr.flex2 = (hw_rate & 0x00000000ffffffff);
if (rack->r_ctl.crte) {
ifp = rack->r_ctl.crte->ptbl->rs_ifp;
} else if (rack->rc_inp->inp_route.ro_nh &&
rack->rc_inp->inp_route.ro_nh->nh_ifp) {
ifp = rack->rc_inp->inp_route.ro_nh->nh_ifp;
} else
ifp = NULL;
if (ifp) {
ifp64 = (uintptr_t)ifp;
log.u_bbr.flex3 = ((ifp64 >> 32) & 0x00000000ffffffff);
log.u_bbr.flex4 = (ifp64 & 0x00000000ffffffff);
}
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.bw_inuse = rate;
log.u_bbr.flex5 = line;
log.u_bbr.flex6 = error;
log.u_bbr.flex7 = mod;
log.u_bbr.applimited = rack->r_ctl.rc_pace_max_segs;
log.u_bbr.flex8 = rack->use_fixed_rate;
log.u_bbr.flex8 <<= 1;
log.u_bbr.flex8 |= rack->rack_hdrw_pacing;
log.u_bbr.pkts_out = rack->rc_tp->t_maxseg;
log.u_bbr.delRate = rack->r_ctl.crte_prev_rate;
if (rack->r_ctl.crte)
log.u_bbr.cur_del_rate = rack->r_ctl.crte->rate;
else
log.u_bbr.cur_del_rate = 0;
log.u_bbr.rttProp = rack->r_ctl.last_hw_bw_req;
log.u_bbr.epoch = rack->r_ctl.current_round;
log.u_bbr.lt_epoch = rack->r_ctl.rc_considered_lost;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_HDWR_PACE, 0,
0, &log, false, &tv);
}
}
static uint64_t
rack_get_output_bw(struct tcp_rack *rack, uint64_t bw, struct rack_sendmap *rsm, int *capped)
{
uint64_t bw_est, high_rate;
uint64_t gain;
gain = (uint64_t)rack_get_output_gain(rack, rsm);
bw_est = bw * gain;
bw_est /= (uint64_t)100;
if (bw_est < RACK_MIN_BW)
bw_est = RACK_MIN_BW;
if (rack->r_rack_hw_rate_caps) {
if (rack->r_ctl.crte != NULL) {
high_rate = tcp_hw_highest_rate(rack->r_ctl.crte);
if (bw_est >= high_rate) {
if (rack_hw_rate_cap_per &&
(((high_rate * (100 + rack_hw_rate_cap_per)) / 100) < bw_est)) {
rack->r_rack_hw_rate_caps = 0;
goto done;
}
rack_log_hdwr_pacing(rack,
bw_est, high_rate, __LINE__,
0, 3);
bw_est = high_rate;
if (capped)
*capped = 1;
}
} else if ((rack->rack_hdrw_pacing == 0) &&
(rack->rack_hdw_pace_ena) &&
(rack->rack_attempt_hdwr_pace == 0) &&
(rack->rc_inp->inp_route.ro_nh != NULL) &&
(rack->rc_inp->inp_route.ro_nh->nh_ifp != NULL)) {
high_rate = tcp_hw_highest_rate_ifp(rack->rc_inp->inp_route.ro_nh->nh_ifp, rack->rc_inp);
if (high_rate) {
if (bw_est > high_rate) {
bw_est = high_rate;
if (capped)
*capped = 1;
}
}
}
}
done:
return (bw_est);
}
static void
rack_log_retran_reason(struct tcp_rack *rack, struct rack_sendmap *rsm, uint32_t tsused, uint32_t thresh, int mod)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
if ((mod != 1) && (rack_verbose_logging == 0)) {
return;
}
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = tsused;
log.u_bbr.flex2 = thresh;
log.u_bbr.flex3 = rsm->r_flags;
log.u_bbr.flex4 = rsm->r_dupack;
log.u_bbr.flex5 = rsm->r_start;
log.u_bbr.flex6 = rsm->r_end;
log.u_bbr.flex8 = mod;
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
log.u_bbr.pacing_gain = rack->r_must_retran;
log.u_bbr.epoch = rack->r_ctl.current_round;
log.u_bbr.lt_epoch = rack->r_ctl.rc_considered_lost;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_SETTINGS_CHG, 0,
0, &log, false, &tv);
}
}
static void
rack_log_to_start(struct tcp_rack *rack, uint32_t cts, uint32_t to, int32_t pacing_delay, uint8_t which)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = rack->rc_tp->t_srtt;
log.u_bbr.flex2 = to;
log.u_bbr.flex3 = rack->r_ctl.rc_hpts_flags;
log.u_bbr.flex4 = pacing_delay;
log.u_bbr.flex5 = rack->rc_tp->t_hpts_slot;
log.u_bbr.flex6 = rack->rc_tp->t_rxtcur;
log.u_bbr.flex7 = rack->rc_in_persist;
log.u_bbr.flex8 = which;
if (rack->rack_no_prr)
log.u_bbr.pkts_out = 0;
else
log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
log.u_bbr.pacing_gain = rack->r_must_retran;
log.u_bbr.cwnd_gain = rack->rack_deferred_inited;
log.u_bbr.pkt_epoch = rack->rc_has_collapsed;
log.u_bbr.lt_epoch = rack->rc_tp->t_rxtshift;
log.u_bbr.lost = rack_rto_min;
log.u_bbr.epoch = rack->r_ctl.roundends;
log.u_bbr.bw_inuse = rack->r_ctl.current_round;
log.u_bbr.bw_inuse <<= 32;
log.u_bbr.bw_inuse |= rack->r_ctl.rc_considered_lost;
log.u_bbr.applimited = rack->rc_tp->t_flags2;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_TIMERSTAR, 0,
0, &log, false, &tv);
}
}
static void
rack_log_to_event(struct tcp_rack *rack, int32_t to_num, struct rack_sendmap *rsm)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.flex8 = to_num;
log.u_bbr.flex1 = rack->r_ctl.rc_rack_min_rtt;
log.u_bbr.flex2 = rack->rc_rack_rtt;
if (rsm == NULL)
log.u_bbr.flex3 = 0;
else
log.u_bbr.flex3 = rsm->r_end - rsm->r_start;
if (rack->rack_no_prr)
log.u_bbr.flex5 = 0;
else
log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
log.u_bbr.pacing_gain = rack->r_must_retran;
log.u_bbr.bw_inuse = rack->r_ctl.current_round;
log.u_bbr.bw_inuse <<= 32;
log.u_bbr.bw_inuse |= rack->r_ctl.rc_considered_lost;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_RTO, 0,
0, &log, false, &tv);
}
}
static void
rack_log_map_chg(struct tcpcb *tp, struct tcp_rack *rack,
struct rack_sendmap *prev,
struct rack_sendmap *rsm,
struct rack_sendmap *next,
int flag, uint32_t th_ack, int line)
{
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex8 = flag;
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.cur_del_rate = (uintptr_t)prev;
log.u_bbr.delRate = (uintptr_t)rsm;
log.u_bbr.rttProp = (uintptr_t)next;
if (rsm)
log.u_bbr.flex1 = rsm->r_flags;
log.u_bbr.flex7 = 0;
if (prev) {
log.u_bbr.flex1 = prev->r_start;
log.u_bbr.flex2 = prev->r_end;
log.u_bbr.flex7 |= 0x4;
}
if (rsm) {
log.u_bbr.flex3 = rsm->r_start;
log.u_bbr.flex4 = rsm->r_end;
log.u_bbr.flex7 |= 0x2;
}
if (next) {
log.u_bbr.flex5 = next->r_start;
log.u_bbr.flex6 = next->r_end;
log.u_bbr.flex7 |= 0x1;
}
log.u_bbr.applimited = line;
log.u_bbr.pkts_out = th_ack;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
if (rack->rack_no_prr)
log.u_bbr.lost = 0;
else
log.u_bbr.lost = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.bw_inuse = rack->r_ctl.current_round;
log.u_bbr.bw_inuse <<= 32;
log.u_bbr.bw_inuse |= rack->r_ctl.rc_considered_lost;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
TCP_LOG_MAPCHG, 0,
0, &log, false, &tv);
}
}
static void
rack_log_rtt_upd(struct tcpcb *tp, struct tcp_rack *rack, uint32_t t, uint32_t len,
struct rack_sendmap *rsm, int conf)
{
if (tcp_bblogging_on(tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.flex1 = t;
log.u_bbr.flex2 = len;
log.u_bbr.flex3 = rack->r_ctl.rc_rack_min_rtt;
log.u_bbr.flex4 = rack->r_ctl.rack_rs.rs_rtt_lowest;
log.u_bbr.flex5 = rack->r_ctl.rack_rs.rs_rtt_highest;
log.u_bbr.flex6 = rack->r_ctl.rack_rs.rs_us_rtrcnt;
log.u_bbr.flex7 = conf;
log.u_bbr.rttProp = (uint64_t)rack->r_ctl.rack_rs.rs_rtt_tot;
log.u_bbr.flex8 = rack->r_ctl.rc_rate_sample_method;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.delivered = rack->r_ctl.rack_rs.rs_us_rtrcnt;
log.u_bbr.pkts_out = rack->r_ctl.rack_rs.rs_flags;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
if (rsm) {
log.u_bbr.pkt_epoch = rsm->r_start;
log.u_bbr.lost = rsm->r_end;
log.u_bbr.cwnd_gain = rsm->r_rtr_cnt;
log.u_bbr.pacing_gain = (uint16_t)rsm->r_flags;
} else {
log.u_bbr.pkt_epoch = rack->rc_tp->iss;
log.u_bbr.lost = 0;
log.u_bbr.cwnd_gain = 0;
log.u_bbr.pacing_gain = 0;
}
log.u_bbr.use_lt_bw = rack->rc_highly_buffered;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->forced_ack;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->rc_gp_dyn_mul;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->in_probe_rtt;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->measure_saw_probe_rtt;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->app_limited_needs_set;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->rc_gp_filled;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->rc_dragged_bottom;
log.u_bbr.applimited = rack->r_ctl.rc_target_probertt_flight;
log.u_bbr.epoch = rack->r_ctl.rc_time_probertt_starts;
log.u_bbr.lt_epoch = rack->r_ctl.rc_time_probertt_entered;
log.u_bbr.cur_del_rate = rack->r_ctl.rc_lower_rtt_us_cts;
log.u_bbr.delRate = rack->r_ctl.rc_gp_srtt;
log.u_bbr.bw_inuse = tcp_tv_to_usec(&rack->r_ctl.act_rcv_time);
log.u_bbr.bw_inuse <<= 32;
if (rsm)
log.u_bbr.bw_inuse |= ((uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)]);
TCP_LOG_EVENTP(tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_BBRRTT, 0,
0, &log, false, &tv);
}
}
static void
rack_log_rtt_sample(struct tcp_rack *rack, uint32_t rtt)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = rtt;
log.u_bbr.flex6 = rack->rc_tp->t_rxtcur;
log.u_bbr.flex7 = 1;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
log.u_bbr.pacing_gain = rack->r_must_retran;
log.u_bbr.delRate = rack->r_ctl.rack_rs.confidence;
log.u_bbr.delRate <<= 32;
log.u_bbr.delRate |= rack->r_ctl.rack_rs.rs_us_rtt;
log.u_bbr.applimited = rack_rto_min;
log.u_bbr.epoch = rack_rto_max;
log.u_bbr.lt_epoch = rack->r_ctl.timer_slop;
log.u_bbr.lost = rack_rto_min;
log.u_bbr.pkt_epoch = TICKS_2_USEC(tcp_rexmit_slop);
log.u_bbr.rttProp = RACK_REXMTVAL(rack->rc_tp);
log.u_bbr.bw_inuse = rack->r_ctl.act_rcv_time.tv_sec;
log.u_bbr.bw_inuse *= HPTS_USEC_IN_SEC;
log.u_bbr.bw_inuse += rack->r_ctl.act_rcv_time.tv_usec;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
TCP_LOG_RTT, 0,
0, &log, false, &tv);
}
}
static void
rack_log_rtt_sample_calc(struct tcp_rack *rack, uint32_t rtt, uint32_t send_time, uint32_t ack_time, int where)
{
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = rtt;
log.u_bbr.flex2 = send_time;
log.u_bbr.flex3 = ack_time;
log.u_bbr.flex4 = where;
log.u_bbr.flex7 = 2;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.bw_inuse = rack->r_ctl.current_round;
log.u_bbr.bw_inuse <<= 32;
log.u_bbr.bw_inuse |= rack->r_ctl.rc_considered_lost;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
TCP_LOG_RTT, 0,
0, &log, false, &tv);
}
}
static void
rack_log_rtt_sendmap(struct tcp_rack *rack, uint32_t idx, uint64_t tsv, uint32_t tsecho)
{
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = idx;
log.u_bbr.flex2 = rack_ts_to_msec(tsv);
log.u_bbr.flex3 = tsecho;
log.u_bbr.flex7 = 3;
log.u_bbr.rttProp = tsv;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.bw_inuse = rack->r_ctl.current_round;
log.u_bbr.bw_inuse <<= 32;
log.u_bbr.bw_inuse |= rack->r_ctl.rc_considered_lost;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
TCP_LOG_RTT, 0,
0, &log, false, &tv);
}
}
static inline void
rack_log_progress_event(struct tcp_rack *rack, struct tcpcb *tp, uint32_t tick, int event, int line)
{
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.flex1 = line;
log.u_bbr.flex2 = tick;
log.u_bbr.flex3 = tp->t_maxunacktime;
log.u_bbr.flex4 = tp->t_acktime;
log.u_bbr.flex8 = event;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
log.u_bbr.pacing_gain = rack->r_must_retran;
log.u_bbr.bw_inuse = rack->r_ctl.current_round;
log.u_bbr.bw_inuse <<= 32;
log.u_bbr.bw_inuse |= rack->r_ctl.rc_considered_lost;
TCP_LOG_EVENTP(tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_PROGRESS, 0,
0, &log, false, &tv);
}
}
static void
rack_log_type_bbrsnd(struct tcp_rack *rack, uint32_t len, uint32_t pacing_delay, uint32_t cts, struct timeval *tv, int line)
{
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.flex1 = pacing_delay;
if (rack->rack_no_prr)
log.u_bbr.flex2 = 0;
else
log.u_bbr.flex2 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
log.u_bbr.flex6 = line;
log.u_bbr.flex7 = (0x0000ffff & rack->r_ctl.rc_hpts_flags);
log.u_bbr.flex8 = rack->rc_in_persist;
log.u_bbr.timeStamp = cts;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
log.u_bbr.pacing_gain = rack->r_must_retran;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_BBRSND, 0,
0, &log, false, tv);
}
}
static void
rack_log_doseg_done(struct tcp_rack *rack, uint32_t cts, int32_t nxt_pkt, int32_t did_out, int way_out, int nsegs)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = did_out;
log.u_bbr.flex2 = nxt_pkt;
log.u_bbr.flex3 = way_out;
log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
if (rack->rack_no_prr)
log.u_bbr.flex5 = 0;
else
log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex6 = nsegs;
log.u_bbr.applimited = rack->r_ctl.rc_pace_min_segs;
log.u_bbr.flex7 = rack->rc_ack_can_sendout_data;
log.u_bbr.flex7 <<= 1;
log.u_bbr.flex7 |= rack->r_fast_output;
log.u_bbr.flex7 <<= 1;
log.u_bbr.flex7 |= rack->r_wanted_output;
log.u_bbr.flex8 = rack->rc_in_persist;
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.use_lt_bw = rack->r_ent_rec_ns;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->r_might_revert;
log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
log.u_bbr.pacing_gain = rack->r_must_retran;
log.u_bbr.bw_inuse = rack->r_ctl.current_round;
log.u_bbr.bw_inuse <<= 32;
log.u_bbr.bw_inuse |= rack->r_ctl.rc_considered_lost;
log.u_bbr.epoch = rack->rc_inp->inp_socket->so_snd.sb_hiwat;
log.u_bbr.lt_epoch = rack->rc_inp->inp_socket->so_rcv.sb_hiwat;
log.u_bbr.lost = rack->rc_tp->t_srtt;
log.u_bbr.pkt_epoch = rack->rc_tp->rfbuf_cnt;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_DOSEG_DONE, 0,
0, &log, false, &tv);
}
}
static void
rack_log_type_pacing_sizes(struct tcpcb *tp, struct tcp_rack *rack, uint32_t arg1, uint32_t arg2, uint32_t arg3, uint8_t frm)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = rack->r_ctl.rc_pace_min_segs;
log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs;
log.u_bbr.flex4 = arg1;
log.u_bbr.flex5 = arg2;
log.u_bbr.flex7 = rack->r_ctl.rc_user_set_min_segs;
log.u_bbr.flex6 = arg3;
log.u_bbr.flex8 = frm;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
log.u_bbr.applimited = rack->r_ctl.rc_sacked;
log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
log.u_bbr.pacing_gain = rack->r_must_retran;
TCP_LOG_EVENTP(tp, NULL, &tptosocket(tp)->so_rcv,
&tptosocket(tp)->so_snd,
TCP_HDWR_PACE_SIZE, 0, 0, &log, false, &tv);
}
}
static void
rack_log_type_just_return(struct tcp_rack *rack, uint32_t cts, uint32_t tlen, uint32_t pacing_delay,
uint8_t hpts_calling, int reason, uint32_t cwnd_to_use)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.flex1 = pacing_delay;
log.u_bbr.flex2 = rack->r_ctl.rc_hpts_flags;
log.u_bbr.flex4 = reason;
if (rack->rack_no_prr)
log.u_bbr.flex5 = 0;
else
log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex7 = hpts_calling;
log.u_bbr.flex8 = rack->rc_in_persist;
log.u_bbr.lt_epoch = cwnd_to_use;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
log.u_bbr.pacing_gain = rack->r_must_retran;
log.u_bbr.cwnd_gain = rack->rc_has_collapsed;
log.u_bbr.bw_inuse = rack->r_ctl.current_round;
log.u_bbr.bw_inuse <<= 32;
log.u_bbr.bw_inuse |= rack->r_ctl.rc_considered_lost;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_JUSTRET, 0,
tlen, &log, false, &tv);
}
}
static void
rack_log_to_cancel(struct tcp_rack *rack, int32_t hpts_removed, int line, uint32_t us_cts,
struct timeval *tv, uint32_t flags_on_entry)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.flex1 = line;
log.u_bbr.flex2 = rack->r_ctl.rc_last_output_to;
log.u_bbr.flex3 = flags_on_entry;
log.u_bbr.flex4 = us_cts;
if (rack->rack_no_prr)
log.u_bbr.flex5 = 0;
else
log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex6 = rack->rc_tp->t_rxtcur;
log.u_bbr.flex7 = hpts_removed;
log.u_bbr.flex8 = 1;
log.u_bbr.applimited = rack->r_ctl.rc_hpts_flags;
log.u_bbr.timeStamp = us_cts;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
log.u_bbr.pacing_gain = rack->r_must_retran;
log.u_bbr.bw_inuse = rack->r_ctl.current_round;
log.u_bbr.bw_inuse <<= 32;
log.u_bbr.bw_inuse |= rack->r_ctl.rc_considered_lost;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_TIMERCANC, 0,
0, &log, false, tv);
}
}
static void
rack_log_alt_to_to_cancel(struct tcp_rack *rack,
uint32_t flex1, uint32_t flex2,
uint32_t flex3, uint32_t flex4,
uint32_t flex5, uint32_t flex6,
uint16_t flex7, uint8_t mod)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
if (mod == 1) {
return;
}
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.flex1 = flex1;
log.u_bbr.flex2 = flex2;
log.u_bbr.flex3 = flex3;
log.u_bbr.flex4 = flex4;
log.u_bbr.flex5 = flex5;
log.u_bbr.flex6 = flex6;
log.u_bbr.flex7 = flex7;
log.u_bbr.flex8 = mod;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_TIMERCANC, 0,
0, &log, false, &tv);
}
}
static void
rack_log_to_processing(struct tcp_rack *rack, uint32_t cts, int32_t ret, int32_t timers)
{
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = timers;
log.u_bbr.flex2 = ret;
log.u_bbr.flex3 = rack->r_ctl.rc_timer_exp;
log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
log.u_bbr.flex5 = cts;
if (rack->rack_no_prr)
log.u_bbr.flex6 = 0;
else
log.u_bbr.flex6 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
log.u_bbr.pacing_gain = rack->r_must_retran;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_TO_PROCESS, 0,
0, &log, false, &tv);
}
}
static void
rack_log_to_prr(struct tcp_rack *rack, int frm, int orig_cwnd, int line)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = rack->r_ctl.rc_prr_out;
log.u_bbr.flex2 = rack->r_ctl.rc_prr_recovery_fs;
if (rack->rack_no_prr)
log.u_bbr.flex3 = 0;
else
log.u_bbr.flex3 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex4 = rack->r_ctl.rc_prr_delivered;
log.u_bbr.flex5 = rack->r_ctl.rc_sacked;
log.u_bbr.flex6 = rack->r_ctl.rc_holes_rxt;
log.u_bbr.flex7 = line;
log.u_bbr.flex8 = frm;
log.u_bbr.pkts_out = orig_cwnd;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.use_lt_bw = rack->r_ent_rec_ns;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->r_might_revert;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_BBRUPD, 0,
0, &log, false, &tv);
}
}
static void
rack_counter_destroy(void)
{
counter_u64_free(rack_total_bytes);
counter_u64_free(rack_fto_send);
counter_u64_free(rack_fto_rsm_send);
counter_u64_free(rack_nfto_resend);
counter_u64_free(rack_hw_pace_init_fail);
counter_u64_free(rack_hw_pace_lost);
counter_u64_free(rack_non_fto_send);
counter_u64_free(rack_extended_rfo);
counter_u64_free(rack_tlp_tot);
counter_u64_free(rack_tlp_newdata);
counter_u64_free(rack_tlp_retran);
counter_u64_free(rack_tlp_retran_bytes);
counter_u64_free(rack_to_tot);
counter_u64_free(rack_saw_enobuf);
counter_u64_free(rack_saw_enobuf_hw);
counter_u64_free(rack_saw_enetunreach);
counter_u64_free(rack_hot_alloc);
counter_u64_free(rack_to_alloc);
counter_u64_free(rack_to_alloc_hard);
counter_u64_free(rack_to_alloc_emerg);
counter_u64_free(rack_to_alloc_limited);
counter_u64_free(rack_alloc_limited_conns);
counter_u64_free(rack_split_limited);
counter_u64_free(rack_multi_single_eq);
counter_u64_free(rack_rxt_clamps_cwnd);
counter_u64_free(rack_rxt_clamps_cwnd_uniq);
counter_u64_free(rack_proc_non_comp_ack);
counter_u64_free(rack_sack_proc_all);
counter_u64_free(rack_sack_proc_restart);
counter_u64_free(rack_sack_proc_short);
counter_u64_free(rack_input_idle_reduces);
counter_u64_free(rack_collapsed_win);
counter_u64_free(rack_collapsed_win_rxt);
counter_u64_free(rack_collapsed_win_rxt_bytes);
counter_u64_free(rack_collapsed_win_seen);
counter_u64_free(rack_try_scwnd);
counter_u64_free(rack_persists_sends);
counter_u64_free(rack_persists_acks);
counter_u64_free(rack_persists_loss);
counter_u64_free(rack_persists_lost_ends);
#ifdef INVARIANTS
counter_u64_free(rack_adjust_map_bw);
#endif
COUNTER_ARRAY_FREE(rack_out_size, TCP_MSS_ACCT_SIZE);
COUNTER_ARRAY_FREE(rack_opts_arry, RACK_OPTS_SIZE);
}
static struct rack_sendmap *
rack_alloc(struct tcp_rack *rack)
{
struct rack_sendmap *rsm;
if (rack->rc_free_cnt > rack_free_cache) {
rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext);
counter_u64_add(rack_hot_alloc, 1);
rack->rc_free_cnt--;
return (rsm);
}
rsm = uma_zalloc(rack_zone, M_NOWAIT);
if (rsm) {
rack->r_ctl.rc_num_maps_alloced++;
counter_u64_add(rack_to_alloc, 1);
return (rsm);
}
if (rack->rc_free_cnt) {
counter_u64_add(rack_to_alloc_emerg, 1);
rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext);
rack->rc_free_cnt--;
return (rsm);
}
return (NULL);
}
static struct rack_sendmap *
rack_alloc_full_limit(struct tcp_rack *rack)
{
if ((V_tcp_map_entries_limit > 0) &&
(rack->r_ctl.rc_num_maps_alloced >= V_tcp_map_entries_limit)) {
counter_u64_add(rack_to_alloc_limited, 1);
if (!rack->alloc_limit_reported) {
rack->alloc_limit_reported = 1;
counter_u64_add(rack_alloc_limited_conns, 1);
}
return (NULL);
}
return (rack_alloc(rack));
}
static struct rack_sendmap *
rack_alloc_limit(struct tcp_rack *rack, uint8_t limit_type)
{
struct rack_sendmap *rsm;
if (limit_type) {
if (rack->r_ctl.rc_split_limit > 0 &&
rack->r_ctl.rc_num_split_allocs >= rack->r_ctl.rc_split_limit) {
counter_u64_add(rack_split_limited, 1);
if (!rack->alloc_limit_reported) {
rack->alloc_limit_reported = 1;
counter_u64_add(rack_alloc_limited_conns, 1);
}
return (NULL);
}
}
rsm = rack_alloc(rack);
if (rsm != NULL && limit_type) {
rsm->r_limit_type = limit_type;
rack->r_ctl.rc_num_split_allocs++;
}
return (rsm);
}
static void
rack_free_trim(struct tcp_rack *rack)
{
struct rack_sendmap *rsm;
while (rack->rc_free_cnt > rack_free_cache) {
rsm = TAILQ_LAST(&rack->r_ctl.rc_free, rack_head);
TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext);
rack->rc_free_cnt--;
rack->r_ctl.rc_num_maps_alloced--;
uma_zfree(rack_zone, rsm);
}
}
static void
rack_free(struct tcp_rack *rack, struct rack_sendmap *rsm)
{
if (rsm->r_flags & RACK_APP_LIMITED) {
KASSERT((rack->r_ctl.rc_app_limited_cnt > 0),
("app_cnt %u, rsm %p", rack->r_ctl.rc_app_limited_cnt, rsm));
rack->r_ctl.rc_app_limited_cnt--;
}
if (rsm->r_limit_type) {
rack->r_ctl.rc_num_split_allocs--;
}
if (rsm == rack->r_ctl.rc_first_appl) {
rack->r_ctl.cleared_app_ack_seq = rsm->r_end;
rack->r_ctl.cleared_app_ack = 1;
if (rack->r_ctl.rc_app_limited_cnt == 0)
rack->r_ctl.rc_first_appl = NULL;
else
rack->r_ctl.rc_first_appl = tqhash_find(rack->r_ctl.tqh, rsm->r_nseq_appl);
}
if (rsm == rack->r_ctl.rc_resend)
rack->r_ctl.rc_resend = NULL;
if (rsm == rack->r_ctl.rc_end_appl)
rack->r_ctl.rc_end_appl = NULL;
if (rack->r_ctl.rc_tlpsend == rsm)
rack->r_ctl.rc_tlpsend = NULL;
if (rack->r_ctl.rc_sacklast == rsm)
rack->r_ctl.rc_sacklast = NULL;
memset(rsm, 0, sizeof(struct rack_sendmap));
if ((rack->rc_free_cnt + 1) > RACK_FREE_CNT_MAX) {
rack_free_trim(rack);
}
TAILQ_INSERT_HEAD(&rack->r_ctl.rc_free, rsm, r_tnext);
rack->rc_free_cnt++;
}
static uint32_t
rack_get_measure_window(struct tcpcb *tp, struct tcp_rack *rack)
{
uint64_t srtt, bw, len, tim;
uint32_t segsiz, def_len, minl;
segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
def_len = rack_def_data_window * segsiz;
if (rack->rc_gp_filled == 0) {
return (def_len);
}
bw = rack_get_bw(rack);
srtt = (uint64_t)tp->t_srtt;
len = bw * srtt;
len /= (uint64_t)HPTS_USEC_IN_SEC;
len *= max(1, rack_goal_bdp);
len = roundup(len, segsiz);
if (rack_min_measure_usec) {
tim = rack_min_measure_usec;
minl = (tim * bw) / (uint64_t)HPTS_USEC_IN_SEC;
if (minl == 0)
minl = 1;
minl = roundup(minl, segsiz);
if (len < minl)
len = minl;
}
if (len < def_len)
return (max((uint32_t)len, ((MIN_GP_WIN+2) * segsiz)));
else
return (max((uint32_t)len, def_len));
}
static int
rack_enough_for_measurement(struct tcpcb *tp, struct tcp_rack *rack, tcp_seq th_ack, uint8_t *quality)
{
uint32_t tim, srtts, segsiz;
if (SEQ_LT(th_ack, tp->gput_seq)) {
return (0);
}
if ((tp->snd_max == tp->snd_una) ||
(th_ack == tp->snd_max)){
*quality = RACK_QUALITY_ALLACKED;
return (1);
}
if (SEQ_GEQ(th_ack, tp->gput_ack)) {
*quality = RACK_QUALITY_HIGH;
return (1);
}
segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
if (SEQ_LT(th_ack, tp->gput_ack) &&
((th_ack - tp->gput_seq) < max(rc_init_window(rack), (MIN_GP_WIN * segsiz)))) {
return (0);
}
if (rack->r_ctl.rc_first_appl &&
(SEQ_GEQ(th_ack, rack->r_ctl.rc_first_appl->r_end))) {
*quality = RACK_QUALITY_APPLIMITED;
return (1);
}
srtts = (rack->r_ctl.rc_gp_srtt * rack_min_srtts);
tim = tcp_tv_to_usec(&rack->r_ctl.act_rcv_time) - tp->gput_ts;
if ((tim >= srtts) && (IN_RECOVERY(rack->rc_tp->t_flags) == 0)) {
*quality = RACK_QUALITY_HIGH;
return (1);
}
return (0);
}
static void
rack_log_timely(struct tcp_rack *rack,
uint32_t logged, uint64_t cur_bw, uint64_t low_bnd,
uint64_t up_bnd, int line, uint8_t method)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = logged;
log.u_bbr.flex2 = rack->rc_gp_timely_inc_cnt;
log.u_bbr.flex2 <<= 4;
log.u_bbr.flex2 |= rack->rc_gp_timely_dec_cnt;
log.u_bbr.flex2 <<= 4;
log.u_bbr.flex2 |= rack->rc_gp_incr;
log.u_bbr.flex2 <<= 4;
log.u_bbr.flex2 |= rack->rc_gp_bwred;
log.u_bbr.flex3 = rack->rc_gp_incr;
log.u_bbr.flex4 = rack->r_ctl.rack_per_of_gp_ss;
log.u_bbr.flex5 = rack->r_ctl.rack_per_of_gp_ca;
log.u_bbr.flex6 = rack->r_ctl.rack_per_of_gp_rec;
log.u_bbr.flex7 = rack->rc_gp_bwred;
log.u_bbr.flex8 = method;
log.u_bbr.cur_del_rate = cur_bw;
log.u_bbr.delRate = low_bnd;
log.u_bbr.bw_inuse = up_bnd;
log.u_bbr.rttProp = rack_get_bw(rack);
log.u_bbr.pkt_epoch = line;
log.u_bbr.pkts_out = rack->r_ctl.rc_rtt_diff;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.epoch = rack->r_ctl.rc_gp_srtt;
log.u_bbr.lt_epoch = rack->r_ctl.rc_prev_gp_srtt;
log.u_bbr.cwnd_gain = rack->rc_dragged_bottom;
log.u_bbr.cwnd_gain <<= 1;
log.u_bbr.cwnd_gain |= rack->rc_gp_saw_rec;
log.u_bbr.cwnd_gain <<= 1;
log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ss;
log.u_bbr.cwnd_gain <<= 1;
log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ca;
log.u_bbr.lost = rack->r_ctl.rc_loss_count;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
TCP_TIMELY_WORK, 0,
0, &log, false, &tv);
}
}
static int
rack_bw_can_be_raised(struct tcp_rack *rack, uint64_t cur_bw, uint64_t last_bw_est, uint16_t mult)
{
uint64_t act_rate, max_allow_rate;
if (rack_timely_no_stopping)
return (1);
if ((cur_bw == 0) || (last_bw_est == 0)) {
rack_log_timely(rack, mult, cur_bw, 0, 0,
__LINE__, 9);
return (1);
}
if (mult <= 100) {
rack_log_timely(rack, mult, cur_bw, 0, 0,
__LINE__, 9);
return (1);
}
act_rate = cur_bw * (uint64_t)mult;
act_rate /= 100;
max_allow_rate = last_bw_est * ((uint64_t)rack_max_per_above + (uint64_t)100);
max_allow_rate /= 100;
if (act_rate < max_allow_rate) {
rack_log_timely(rack, mult, cur_bw, act_rate, max_allow_rate,
__LINE__, 9);
return (1);
} else {
rack_log_timely(rack, mult, cur_bw, act_rate, max_allow_rate,
__LINE__, 8);
return (0);
}
}
static void
rack_validate_multipliers_at_or_above100(struct tcp_rack *rack)
{
if (rack->r_ctl.rack_per_of_gp_rec < 100) {
rack->r_ctl.rack_per_of_gp_rec = 100;
}
if (rack->r_ctl.rack_per_of_gp_ca < 100) {
rack->r_ctl.rack_per_of_gp_ca = 100;
}
if (rack->r_ctl.rack_per_of_gp_ss < 100) {
rack->r_ctl.rack_per_of_gp_ss = 100;
}
}
static void
rack_validate_multipliers_at_or_below_100(struct tcp_rack *rack)
{
if (rack->r_ctl.rack_per_of_gp_ca > 100) {
rack->r_ctl.rack_per_of_gp_ca = 100;
}
if (rack->r_ctl.rack_per_of_gp_ss > 100) {
rack->r_ctl.rack_per_of_gp_ss = 100;
}
}
static void
rack_increase_bw_mul(struct tcp_rack *rack, int timely_says, uint64_t cur_bw, uint64_t last_bw_est, int override)
{
int32_t calc, logged, plus;
logged = 0;
if (rack->rc_skip_timely)
return;
if (override) {
goto extra_boost;
}
if (rack->rc_gp_incr &&
((rack->rc_gp_timely_inc_cnt + 1) >= RACK_TIMELY_CNT_BOOST)) {
extra_boost:
plus = (uint32_t)rack_gp_increase_per * RACK_TIMELY_CNT_BOOST;
rack->rc_gp_timely_inc_cnt = 0;
} else
plus = (uint32_t)rack_gp_increase_per;
if ((plus < 1) &&
((rack->r_ctl.rc_rtt_diff <= 0) || (timely_says <= 0)))
plus = 1;
if (rack->rc_gp_saw_rec &&
(rack->rc_gp_no_rec_chg == 0) &&
rack_bw_can_be_raised(rack, cur_bw, last_bw_est,
rack->r_ctl.rack_per_of_gp_rec)) {
calc = rack->r_ctl.rack_per_of_gp_rec + plus;
if (calc > 0xffff)
calc = 0xffff;
logged |= 1;
rack->r_ctl.rack_per_of_gp_rec = (uint16_t)calc;
if (rack->r_ctl.rack_per_upper_bound_ca &&
(rack->rc_dragged_bottom == 0) &&
(rack->r_ctl.rack_per_of_gp_rec > rack->r_ctl.rack_per_upper_bound_ca))
rack->r_ctl.rack_per_of_gp_rec = rack->r_ctl.rack_per_upper_bound_ca;
}
if (rack->rc_gp_saw_ca &&
(rack->rc_gp_saw_ss == 0) &&
rack_bw_can_be_raised(rack, cur_bw, last_bw_est,
rack->r_ctl.rack_per_of_gp_ca)) {
calc = rack->r_ctl.rack_per_of_gp_ca + plus;
if (calc > 0xffff)
calc = 0xffff;
logged |= 2;
rack->r_ctl.rack_per_of_gp_ca = (uint16_t)calc;
if (rack->r_ctl.rack_per_upper_bound_ca &&
(rack->rc_dragged_bottom == 0) &&
(rack->r_ctl.rack_per_of_gp_ca > rack->r_ctl.rack_per_upper_bound_ca))
rack->r_ctl.rack_per_of_gp_ca = rack->r_ctl.rack_per_upper_bound_ca;
}
if (rack->rc_gp_saw_ss &&
rack_bw_can_be_raised(rack, cur_bw, last_bw_est,
rack->r_ctl.rack_per_of_gp_ss)) {
calc = rack->r_ctl.rack_per_of_gp_ss + plus;
if (calc > 0xffff)
calc = 0xffff;
rack->r_ctl.rack_per_of_gp_ss = (uint16_t)calc;
if (rack->r_ctl.rack_per_upper_bound_ss &&
(rack->rc_dragged_bottom == 0) &&
(rack->r_ctl.rack_per_of_gp_ss > rack->r_ctl.rack_per_upper_bound_ss))
rack->r_ctl.rack_per_of_gp_ss = rack->r_ctl.rack_per_upper_bound_ss;
logged |= 4;
}
if (logged &&
(rack->rc_gp_incr == 0)){
rack->rc_gp_incr = 1;
rack->rc_gp_timely_inc_cnt = 0;
}
if (rack->rc_gp_incr &&
logged &&
(rack->rc_gp_timely_inc_cnt < RACK_TIMELY_CNT_BOOST)) {
rack->rc_gp_timely_inc_cnt++;
}
rack_log_timely(rack, logged, plus, 0, 0,
__LINE__, 1);
}
static uint32_t
rack_get_decrease(struct tcp_rack *rack, uint32_t curper, int32_t rtt_diff)
{
uint64_t perf;
perf = (((uint64_t)curper * ((uint64_t)1000000 -
((uint64_t)rack_gp_decrease_per * (uint64_t)10000 *
(((uint64_t)rtt_diff * (uint64_t)1000000)/
(uint64_t)get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt)))/
(uint64_t)1000000)) /
(uint64_t)1000000);
if (perf > curper) {
perf = curper - 1;
}
return ((uint32_t)perf);
}
static uint32_t
rack_decrease_highrtt(struct tcp_rack *rack, uint32_t curper, uint32_t rtt)
{
uint64_t perf;
uint32_t highrttthresh;
highrttthresh = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_maxmul;
perf = (((uint64_t)curper * ((uint64_t)1000000 -
((uint64_t)rack_gp_decrease_per * ((uint64_t)1000000 -
((uint64_t)highrttthresh * (uint64_t)1000000) /
(uint64_t)rtt)) / 100)) /(uint64_t)1000000);
if (tcp_bblogging_on(rack->rc_tp)) {
uint64_t log1;
log1 = rtt;
log1 <<= 32;
log1 |= highrttthresh;
rack_log_timely(rack,
rack_gp_decrease_per,
(uint64_t)curper,
log1,
perf,
__LINE__,
15);
}
return (perf);
}
static void
rack_decrease_bw_mul(struct tcp_rack *rack, int timely_says, uint32_t rtt, int32_t rtt_diff)
{
uint64_t logvar, logvar2, logvar3;
uint32_t logged, new_per, ss_red, ca_red, rec_red, alt, val;
if (rack->rc_skip_timely)
return;
if (rack->rc_gp_incr) {
rack->rc_gp_incr = 0;
rack->rc_gp_timely_inc_cnt = 0;
}
ss_red = ca_red = rec_red = 0;
logged = 0;
if (rtt_diff < 0) {
rtt_diff *= -1;
}
if (rack->rc_gp_saw_rec && (rack->rc_gp_no_rec_chg == 0)) {
if (timely_says == 2) {
new_per = rack_decrease_highrtt(rack, rack->r_ctl.rack_per_of_gp_rec, rtt);
alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_rec, rtt_diff);
if (alt < new_per)
val = alt;
else
val = new_per;
} else
val = new_per = alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_rec, rtt_diff);
if (rack->r_ctl.rack_per_of_gp_rec > val) {
rec_red = (rack->r_ctl.rack_per_of_gp_rec - val);
rack->r_ctl.rack_per_of_gp_rec = (uint16_t)val;
} else {
rack->r_ctl.rack_per_of_gp_rec = rack_per_lower_bound;
rec_red = 0;
}
if (rack_per_lower_bound > rack->r_ctl.rack_per_of_gp_rec)
rack->r_ctl.rack_per_of_gp_rec = rack_per_lower_bound;
logged |= 1;
}
if (rack->rc_gp_saw_ss) {
if (timely_says == 2) {
new_per = rack_decrease_highrtt(rack, rack->r_ctl.rack_per_of_gp_ss, rtt);
alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_ss, rtt_diff);
if (alt < new_per)
val = alt;
else
val = new_per;
} else
val = new_per = alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_ss, rtt_diff);
if (rack->r_ctl.rack_per_of_gp_ss > new_per) {
ss_red = rack->r_ctl.rack_per_of_gp_ss - val;
rack->r_ctl.rack_per_of_gp_ss = (uint16_t)val;
} else {
ss_red = new_per;
rack->r_ctl.rack_per_of_gp_ss = rack_per_lower_bound;
logvar = new_per;
logvar <<= 32;
logvar |= alt;
logvar2 = (uint32_t)rtt;
logvar2 <<= 32;
logvar2 |= (uint32_t)rtt_diff;
logvar3 = rack_gp_rtt_maxmul;
logvar3 <<= 32;
logvar3 |= get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
rack_log_timely(rack, timely_says,
logvar2, logvar3,
logvar, __LINE__, 10);
}
if (rack_per_lower_bound > rack->r_ctl.rack_per_of_gp_ss)
rack->r_ctl.rack_per_of_gp_ss = rack_per_lower_bound;
logged |= 4;
} else if (rack->rc_gp_saw_ca) {
if (timely_says == 2) {
new_per = rack_decrease_highrtt(rack, rack->r_ctl.rack_per_of_gp_ca, rtt);
alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_ca, rtt_diff);
if (alt < new_per)
val = alt;
else
val = new_per;
} else
val = new_per = alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_ca, rtt_diff);
if (rack->r_ctl.rack_per_of_gp_ca > val) {
ca_red = rack->r_ctl.rack_per_of_gp_ca - val;
rack->r_ctl.rack_per_of_gp_ca = (uint16_t)val;
} else {
rack->r_ctl.rack_per_of_gp_ca = rack_per_lower_bound;
ca_red = 0;
logvar = new_per;
logvar <<= 32;
logvar |= alt;
logvar2 = (uint32_t)rtt;
logvar2 <<= 32;
logvar2 |= (uint32_t)rtt_diff;
logvar3 = rack_gp_rtt_maxmul;
logvar3 <<= 32;
logvar3 |= get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
rack_log_timely(rack, timely_says,
logvar2, logvar3,
logvar, __LINE__, 10);
}
if (rack_per_lower_bound > rack->r_ctl.rack_per_of_gp_ca)
rack->r_ctl.rack_per_of_gp_ca = rack_per_lower_bound;
logged |= 2;
}
if (rack->rc_gp_timely_dec_cnt < 0x7) {
rack->rc_gp_timely_dec_cnt++;
if (rack_timely_dec_clear &&
(rack->rc_gp_timely_dec_cnt == rack_timely_dec_clear))
rack->rc_gp_timely_dec_cnt = 0;
}
logvar = ss_red;
logvar <<= 32;
logvar |= ca_red;
rack_log_timely(rack, logged, rec_red, rack_per_lower_bound, logvar,
__LINE__, 2);
}
static void
rack_log_rtt_shrinks(struct tcp_rack *rack, uint32_t us_cts,
uint32_t rtt, uint32_t line, uint8_t reas)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = line;
log.u_bbr.flex2 = rack->r_ctl.rc_time_probertt_starts;
log.u_bbr.flex3 = rack->r_ctl.rc_lower_rtt_us_cts;
log.u_bbr.flex4 = rack->r_ctl.rack_per_of_gp_ss;
log.u_bbr.flex5 = rtt;
log.u_bbr.flex6 = rack->rc_highly_buffered;
log.u_bbr.flex6 <<= 1;
log.u_bbr.flex6 |= rack->forced_ack;
log.u_bbr.flex6 <<= 1;
log.u_bbr.flex6 |= rack->rc_gp_dyn_mul;
log.u_bbr.flex6 <<= 1;
log.u_bbr.flex6 |= rack->in_probe_rtt;
log.u_bbr.flex6 <<= 1;
log.u_bbr.flex6 |= rack->measure_saw_probe_rtt;
log.u_bbr.flex7 = rack->r_ctl.rack_per_of_gp_probertt;
log.u_bbr.pacing_gain = rack->r_ctl.rack_per_of_gp_ca;
log.u_bbr.cwnd_gain = rack->r_ctl.rack_per_of_gp_rec;
log.u_bbr.flex8 = reas;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.delRate = rack_get_bw(rack);
log.u_bbr.cur_del_rate = rack->r_ctl.rc_highest_us_rtt;
log.u_bbr.cur_del_rate <<= 32;
log.u_bbr.cur_del_rate |= rack->r_ctl.rc_lowest_us_rtt;
log.u_bbr.applimited = rack->r_ctl.rc_time_probertt_entered;
log.u_bbr.pkts_out = rack->r_ctl.rc_rtt_diff;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.epoch = rack->r_ctl.rc_gp_srtt;
log.u_bbr.lt_epoch = rack->r_ctl.rc_prev_gp_srtt;
log.u_bbr.pkt_epoch = rack->r_ctl.rc_lower_rtt_us_cts;
log.u_bbr.delivered = rack->r_ctl.rc_target_probertt_flight;
log.u_bbr.lost = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
log.u_bbr.rttProp = us_cts;
log.u_bbr.rttProp <<= 32;
log.u_bbr.rttProp |= rack->r_ctl.rc_entry_gp_rtt;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_RTT_SHRINKS, 0,
0, &log, false, &rack->r_ctl.act_rcv_time);
}
}
static void
rack_set_prtt_target(struct tcp_rack *rack, uint32_t segsiz, uint32_t rtt)
{
uint64_t bwdp;
bwdp = rack_get_bw(rack);
bwdp *= (uint64_t)rtt;
bwdp /= (uint64_t)HPTS_USEC_IN_SEC;
rack->r_ctl.rc_target_probertt_flight = roundup((uint32_t)bwdp, segsiz);
if (rack->r_ctl.rc_target_probertt_flight < (segsiz * rack_timely_min_segs)) {
rack->r_ctl.rc_target_probertt_flight = (segsiz * rack_timely_min_segs);
}
}
static void
rack_enter_probertt(struct tcp_rack *rack, uint32_t us_cts)
{
uint32_t segsiz;
rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
if (rack->rc_gp_dyn_mul == 0)
return;
if (rack->rc_tp->snd_max == rack->rc_tp->snd_una) {
return;
}
if ((rack->rc_tp->t_flags & TF_GPUTINPROG) &&
SEQ_GT(rack->rc_tp->snd_una, rack->rc_tp->gput_seq)) {
rack_do_goodput_measurement(rack->rc_tp, rack,
rack->rc_tp->snd_una, __LINE__,
RACK_QUALITY_PROBERTT);
}
rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt;
rack->r_ctl.rc_time_probertt_entered = us_cts;
segsiz = min(ctf_fixed_maxseg(rack->rc_tp),
rack->r_ctl.rc_pace_min_segs);
rack->in_probe_rtt = 1;
rack->measure_saw_probe_rtt = 1;
rack->r_ctl.rc_time_probertt_starts = 0;
rack->r_ctl.rc_entry_gp_rtt = rack->r_ctl.rc_gp_srtt;
if (rack_probertt_use_min_rtt_entry)
rack_set_prtt_target(rack, segsiz, get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt));
else
rack_set_prtt_target(rack, segsiz, rack->r_ctl.rc_gp_srtt);
rack_log_rtt_shrinks(rack, us_cts, get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
__LINE__, RACK_RTTS_ENTERPROBE);
}
static void
rack_exit_probertt(struct tcp_rack *rack, uint32_t us_cts)
{
struct rack_sendmap *rsm;
uint32_t segsiz;
segsiz = min(ctf_fixed_maxseg(rack->rc_tp),
rack->r_ctl.rc_pace_min_segs);
rack->in_probe_rtt = 0;
if ((rack->rc_tp->t_flags & TF_GPUTINPROG) &&
SEQ_GT(rack->rc_tp->snd_una, rack->rc_tp->gput_seq)) {
rack_do_goodput_measurement(rack->rc_tp, rack,
rack->rc_tp->snd_una, __LINE__,
RACK_QUALITY_PROBERTT);
} else if (rack->rc_tp->t_flags & TF_GPUTINPROG) {
rack->rc_tp->t_flags &= ~TF_GPUTINPROG;
}
rsm = tqhash_max(rack->r_ctl.tqh);
if (rsm && ((rsm->r_flags & RACK_APP_LIMITED) == 0)) {
if (rack->r_ctl.rc_app_limited_cnt == 0)
rack->r_ctl.rc_end_appl = rack->r_ctl.rc_first_appl = rsm;
else {
if (rack->r_ctl.rc_end_appl)
rack->r_ctl.rc_end_appl->r_nseq_appl = rsm->r_start;
rack->r_ctl.rc_end_appl = rsm;
}
rsm->r_flags |= RACK_APP_LIMITED;
rack->r_ctl.rc_app_limited_cnt++;
}
if (rack_probertt_clear_is) {
rack->rc_gp_incr = 0;
rack->rc_gp_bwred = 0;
rack->rc_gp_timely_inc_cnt = 0;
rack->rc_gp_timely_dec_cnt = 0;
}
if (rack->rc_highly_buffered && rack_atexit_prtt_hbp) {
rack->r_ctl.rack_per_of_gp_ca = rack_atexit_prtt_hbp;
rack->r_ctl.rack_per_of_gp_ss = rack_atexit_prtt_hbp;
}
if ((rack->rc_highly_buffered == 0) && rack_atexit_prtt) {
rack->r_ctl.rack_per_of_gp_ca = rack_atexit_prtt;
rack->r_ctl.rack_per_of_gp_ss = rack_atexit_prtt;
}
rack->r_ctl.rc_rtt_diff = 0;
rack->rc_tp->t_bytes_acked = 0;
rack->rc_tp->t_ccv.flags &= ~CCF_ABC_SENTAWND;
if (rack_probe_rtt_sets_cwnd) {
uint64_t ebdp;
uint32_t setto;
if (rack_probertt_use_min_rtt_exit == 1) {
rack_set_prtt_target(rack, segsiz,
get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt));
} else if (rack_probertt_use_min_rtt_exit == 2) {
rack_set_prtt_target(rack, segsiz,
rack->r_ctl.rc_gp_srtt);
} else if (rack_probertt_use_min_rtt_exit == 3) {
rack_set_prtt_target(rack, segsiz,
rack->r_ctl.rc_entry_gp_rtt);
} else {
uint64_t sum;
uint32_t setval;
sum = rack->r_ctl.rc_entry_gp_rtt;
sum *= 10;
sum /= (uint64_t)(max(1, rack->r_ctl.rc_gp_srtt));
if (sum >= 20) {
setval = rack->r_ctl.rc_entry_gp_rtt;
} else if (sum >= 15) {
setval = rack->r_ctl.rc_gp_srtt;
if (setval > rack->r_ctl.rc_entry_gp_rtt)
setval = rack->r_ctl.rc_entry_gp_rtt;
} else {
setval = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
}
rack_set_prtt_target(rack, segsiz,
setval);
}
if (rack_probe_rtt_sets_cwnd > 1) {
ebdp = rack->r_ctl.rc_target_probertt_flight;
ebdp *= rack_probe_rtt_sets_cwnd;
ebdp /= 100;
setto = rack->r_ctl.rc_target_probertt_flight + ebdp;
} else
setto = rack->r_ctl.rc_target_probertt_flight;
rack->rc_tp->snd_cwnd = roundup(setto, segsiz);
if (rack->rc_tp->snd_cwnd < (segsiz * rack_timely_min_segs)) {
rack->rc_tp->snd_cwnd = segsiz * rack_timely_min_segs;
}
rack->rc_tp->snd_ssthresh = (rack->rc_tp->snd_cwnd - 1);
}
rack_log_rtt_shrinks(rack, us_cts,
get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
__LINE__, RACK_RTTS_EXITPROBE);
rack->r_ctl.rc_probertt_sndmax_atexit = rack->rc_tp->snd_max;
rack->r_ctl.rc_time_probertt_entered = us_cts;
rack->r_ctl.rc_time_probertt_starts = rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
rack->r_ctl.rc_time_of_last_probertt = us_cts;
}
static void
rack_check_probe_rtt(struct tcp_rack *rack, uint32_t us_cts)
{
if (rack->rc_gp_filled == 0) {
return;
}
if (rack->in_probe_rtt) {
uint64_t no_overflow;
uint32_t endtime, must_stay;
if (rack->r_ctl.rc_went_idle_time &&
((us_cts - rack->r_ctl.rc_went_idle_time) > rack_min_probertt_hold)) {
rack_exit_probertt(rack, us_cts);
} else if (rack_probe_rtt_safety_val &&
TSTMP_GT(us_cts, rack->r_ctl.rc_time_probertt_entered) &&
((us_cts - rack->r_ctl.rc_time_probertt_entered) > rack_probe_rtt_safety_val)) {
rack_log_rtt_shrinks(rack, us_cts,
get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
__LINE__, RACK_RTTS_SAFETY);
rack_exit_probertt(rack, us_cts);
}
endtime = rack->r_ctl.rc_time_probertt_entered + (rack->r_ctl.rc_gp_srtt * rack_max_drain_wait);
if (rack->rc_highly_buffered)
endtime += (rack->r_ctl.rc_gp_srtt * rack_max_drain_hbp);
must_stay = rack->r_ctl.rc_time_probertt_entered + (rack->r_ctl.rc_gp_srtt * rack_must_drain);
if ((ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) > rack->r_ctl.rc_target_probertt_flight) &&
TSTMP_LT(us_cts, endtime)) {
uint32_t calc;
no_exit:
if (TSTMP_GT(us_cts, rack->r_ctl.rc_time_probertt_entered))
calc = us_cts - rack->r_ctl.rc_time_probertt_entered;
else
calc = 0;
calc /= max(rack->r_ctl.rc_gp_srtt, 1);
if (calc) {
calc *= rack_per_of_gp_probertt_reduce;
if (calc > rack_per_of_gp_probertt)
rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_lowthresh;
else
rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt - calc;
if (rack->r_ctl.rack_per_of_gp_probertt < rack_per_of_gp_lowthresh)
rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_lowthresh;
}
return;
}
if (rack->r_ctl.rc_time_probertt_starts == 0) {
if ((TSTMP_LT(us_cts, must_stay) &&
rack->rc_highly_buffered) ||
(ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) >
rack->r_ctl.rc_target_probertt_flight)) {
goto no_exit;
}
rack_log_rtt_shrinks(rack, us_cts,
get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
__LINE__, RACK_RTTS_REACHTARGET);
rack->r_ctl.rc_time_probertt_starts = us_cts;
if (rack->r_ctl.rc_time_probertt_starts == 0)
rack->r_ctl.rc_time_probertt_starts = 1;
rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt;
}
no_overflow = ((uint64_t)rack->r_ctl.rc_gp_srtt *
(uint64_t)rack_probertt_gpsrtt_cnt_mul);
if (rack_probertt_gpsrtt_cnt_div)
endtime = (uint32_t)(no_overflow / (uint64_t)rack_probertt_gpsrtt_cnt_div);
else
endtime = 0;
endtime += rack_min_probertt_hold;
endtime += rack->r_ctl.rc_time_probertt_starts;
if (TSTMP_GEQ(us_cts, endtime)) {
rack_exit_probertt(rack, us_cts);
}
} else if ((rack->rc_skip_timely == 0) &&
(TSTMP_GT(us_cts, rack->r_ctl.rc_lower_rtt_us_cts)) &&
((us_cts - rack->r_ctl.rc_lower_rtt_us_cts) >= rack_time_between_probertt)) {
rack_enter_probertt(rack, us_cts);
}
}
static void
rack_update_multiplier(struct tcp_rack *rack, int32_t timely_says, uint64_t last_bw_est,
uint32_t rtt, int32_t rtt_diff)
{
uint64_t cur_bw, up_bnd, low_bnd, subfr;
uint32_t losses;
if ((rack->rc_gp_dyn_mul == 0) ||
(rack->use_fixed_rate) ||
(rack->in_probe_rtt) ||
(rack->rc_always_pace == 0)) {
return;
}
losses = rack->r_ctl.rc_loss_count - rack->r_ctl.rc_loss_at_start;
cur_bw = rack_get_bw(rack);
up_bnd = rack->r_ctl.last_gp_comp_bw * (uint64_t)rack_gp_per_bw_mul_up;
up_bnd /= 100;
up_bnd += rack->r_ctl.last_gp_comp_bw;
subfr = (uint64_t)rack->r_ctl.last_gp_comp_bw * (uint64_t)rack_gp_per_bw_mul_down;
subfr /= 100;
low_bnd = rack->r_ctl.last_gp_comp_bw - subfr;
if ((timely_says == 2) && (rack->r_ctl.rc_no_push_at_mrtt)) {
rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
__LINE__, 3);
if (rack->r_ctl.rc_no_push_at_mrtt > 1)
rack_validate_multipliers_at_or_below_100(rack);
rack_decrease_bw_mul(rack, timely_says, rtt, rtt_diff);
} else if ((timely_says != 0) && (last_bw_est < low_bnd) && !losses) {
rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
__LINE__, 3);
rack->r_ctl.last_gp_comp_bw = cur_bw;
if (rack->rc_gp_bwred == 0) {
rack->rc_gp_bwred = 1;
rack->rc_gp_timely_dec_cnt = 0;
}
if (rack->rc_gp_timely_dec_cnt < rack_timely_max_push_drop) {
if ((rack->rc_gp_saw_ca && rack->r_ctl.rack_per_of_gp_ca <= rack_down_raise_thresh) ||
(rack->rc_gp_saw_ss && rack->r_ctl.rack_per_of_gp_ss <= rack_down_raise_thresh) ||
(timely_says == 0) ||
(rack_down_raise_thresh == 0)) {
rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 1);
} else {
rack_log_timely(rack, 0, last_bw_est, low_bnd, 0,
__LINE__, 11);
}
rack->rc_gp_timely_dec_cnt++;
rack->rc_gp_incr = 0;
rack->rc_gp_timely_inc_cnt = 0;
} else {
goto use_timely;
}
} else if ((timely_says != 2) &&
!losses &&
(last_bw_est > up_bnd)) {
rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
__LINE__, 3);
rack->r_ctl.last_gp_comp_bw = cur_bw;
if (rack->rc_gp_saw_ss &&
rack->r_ctl.rack_per_upper_bound_ss &&
(rack->r_ctl.rack_per_of_gp_ss == rack->r_ctl.rack_per_upper_bound_ss)) {
goto use_timely;
}
if (rack->rc_gp_saw_ca &&
rack->r_ctl.rack_per_upper_bound_ca &&
(rack->r_ctl.rack_per_of_gp_ca == rack->r_ctl.rack_per_upper_bound_ca)) {
goto use_timely;
}
rack->rc_gp_bwred = 0;
rack->rc_gp_timely_dec_cnt = 0;
if ((rack->rc_gp_incr < rack_timely_max_push_rise) || (timely_says == 0)) {
rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);
} else {
rack_log_timely(rack, 0, last_bw_est, up_bnd, 0,
__LINE__, 12);
}
return;
} else {
rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
__LINE__, 3);
use_timely:
if (timely_says) {
rack->rc_gp_incr = 0;
rack->rc_gp_timely_inc_cnt = 0;
if ((rack->rc_gp_timely_dec_cnt < rack_timely_max_push_drop) &&
!losses &&
(last_bw_est < low_bnd)) {
rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);
rack->rc_gp_timely_dec_cnt++;
rack->rc_gp_incr = 0;
rack->rc_gp_timely_inc_cnt = 0;
} else
rack_decrease_bw_mul(rack, timely_says, rtt, rtt_diff);
} else {
rack->rc_gp_bwred = 0;
rack->rc_gp_timely_dec_cnt = 0;
rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);
}
}
}
static int32_t
rack_make_timely_judgement(struct tcp_rack *rack, uint32_t rtt, int32_t rtt_diff, uint32_t prev_rtt)
{
int32_t timely_says;
uint64_t log_mult, log_rtt_a_diff;
log_rtt_a_diff = rtt;
log_rtt_a_diff <<= 32;
log_rtt_a_diff |= (uint32_t)rtt_diff;
if (rtt >= (get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) *
rack_gp_rtt_maxmul)) {
timely_says = 2;
log_mult = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_maxmul;
log_mult <<= 32;
log_mult |= prev_rtt;
rack_log_timely(rack, timely_says, log_mult,
get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
log_rtt_a_diff, __LINE__, 4);
} else if (rtt <= (get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) +
((get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_minmul) /
max(rack_gp_rtt_mindiv , 1)))) {
log_mult = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) +
((get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_minmul) /
max(rack_gp_rtt_mindiv , 1));
log_mult <<= 32;
log_mult |= prev_rtt;
timely_says = 0;
rack_log_timely(rack, timely_says, log_mult ,
get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
log_rtt_a_diff, __LINE__, 5);
} else {
log_mult = prev_rtt;
if (rtt_diff <= 0) {
timely_says = 0;
rack_log_timely(rack, timely_says, log_mult,
get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt), log_rtt_a_diff, __LINE__, 6);
} else {
timely_says = 1;
rack_log_timely(rack, timely_says, log_mult,
get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt), log_rtt_a_diff, __LINE__, 7);
}
}
return (timely_says);
}
static inline int
rack_in_gp_window(struct tcpcb *tp, struct rack_sendmap *rsm)
{
if (SEQ_GEQ(rsm->r_start, tp->gput_seq) &&
SEQ_LEQ(rsm->r_end, tp->gput_ack)) {
return (1);
} else if (SEQ_LT(rsm->r_start, tp->gput_seq) &&
SEQ_GT(rsm->r_end, tp->gput_seq)){
return (1);
} else if (SEQ_GEQ(rsm->r_start, tp->gput_seq) &&
SEQ_LT(rsm->r_start, tp->gput_ack) &&
SEQ_GEQ(rsm->r_end, tp->gput_ack)) {
return (1);
}
return (0);
}
static inline void
rack_mark_in_gp_win(struct tcpcb *tp, struct rack_sendmap *rsm)
{
if ((tp->t_flags & TF_GPUTINPROG) == 0)
return;
if (rack_in_gp_window(tp, rsm))
rsm->r_flags |= RACK_IN_GP_WIN;
else
rsm->r_flags &= ~RACK_IN_GP_WIN;
}
static inline void
rack_clear_gp_marks(struct tcpcb *tp, struct tcp_rack *rack)
{
struct rack_sendmap *rsm = NULL;
rsm = tqhash_find(rack->r_ctl.tqh, tp->gput_seq);
if (rsm == NULL) {
rsm = tqhash_min(rack->r_ctl.tqh);
}
while ((rsm != NULL) && (SEQ_GEQ(tp->gput_ack, rsm->r_start))){
rsm->r_flags &= ~RACK_IN_GP_WIN;
rsm = tqhash_next(rack->r_ctl.tqh, rsm);
}
}
static inline void
rack_tend_gp_marks(struct tcpcb *tp, struct tcp_rack *rack)
{
struct rack_sendmap *rsm = NULL;
if (tp->snd_una == tp->snd_max) {
return;
}
if (SEQ_GT(tp->gput_seq, tp->snd_una)) {
rsm = tqhash_min(rack->r_ctl.tqh);
while (rsm != NULL) {
rack_mark_in_gp_win(tp, rsm);
if (SEQ_GEQ(rsm->r_end, tp->gput_seq))
break;
rsm = tqhash_next(rack->r_ctl.tqh, rsm);
}
}
if (rsm == NULL) {
rsm = tqhash_find(rack->r_ctl.tqh, tp->gput_seq);
if (rsm == NULL)
return;
rack_mark_in_gp_win(tp, rsm);
}
rsm = tqhash_next(rack->r_ctl.tqh, rsm);
while (rsm) {
rack_mark_in_gp_win(tp, rsm);
if (SEQ_GT(rsm->r_end, tp->gput_ack))
break;
rsm = tqhash_next(rack->r_ctl.tqh, rsm);
}
}
static void
rack_log_gp_calc(struct tcp_rack *rack, uint32_t add_part, uint32_t sub_part, uint32_t srtt, uint64_t meas_bw, uint64_t utim, uint8_t meth, uint32_t line)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.flex1 = add_part;
log.u_bbr.flex2 = sub_part;
log.u_bbr.flex3 = rack_wma_divisor;
log.u_bbr.flex4 = srtt;
log.u_bbr.flex7 = (uint16_t)line;
log.u_bbr.flex8 = meth;
log.u_bbr.delRate = rack->r_ctl.gp_bw;
log.u_bbr.cur_del_rate = meas_bw;
log.u_bbr.rttProp = utim;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_THRESH_CALC, 0,
0, &log, false, &rack->r_ctl.act_rcv_time);
}
}
static void
rack_do_goodput_measurement(struct tcpcb *tp, struct tcp_rack *rack,
tcp_seq th_ack, int line, uint8_t quality)
{
uint64_t tim, bytes_ps, stim, utim;
uint32_t segsiz, bytes, reqbytes, us_cts;
int32_t gput, new_rtt_diff, timely_says;
uint64_t resid_bw, subpart = 0, addpart = 0, srtt;
int did_add = 0;
us_cts = tcp_tv_to_usec(&rack->r_ctl.act_rcv_time);
segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
if (TSTMP_GEQ(us_cts, tp->gput_ts))
tim = us_cts - tp->gput_ts;
else
tim = 0;
if (rack->r_ctl.rc_gp_cumack_ts > rack->r_ctl.rc_gp_output_ts)
stim = rack->r_ctl.rc_gp_cumack_ts - rack->r_ctl.rc_gp_output_ts;
else
stim = 0;
if (tim > stim)
utim = max(tim, 1);
else
utim = max(stim, 1);
reqbytes = min(rc_init_window(rack), (MIN_GP_WIN * segsiz));
rack_log_gpset(rack, th_ack, us_cts, rack->r_ctl.rc_gp_cumack_ts, __LINE__, 3, NULL);
if ((tim == 0) && (stim == 0)) {
bytes = 0;
bytes_ps = 0;
rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
0, 0, 0, 10, __LINE__, NULL, quality);
goto skip_measurement;
}
if (rack->r_ctl.rc_gp_lowrtt == 0xffffffff) {
bytes = 0;
bytes_ps = 0;
rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
0, 0, 0, 10, __LINE__, NULL, quality);
goto skip_measurement;
}
rack->r_ctl.last_max_bw = rack->r_ctl.rc_gp_high_rwnd;
rack->r_ctl.last_max_bw *= HPTS_USEC_IN_SEC;
rack->r_ctl.last_max_bw /= rack->r_ctl.rc_gp_lowrtt;
if (SEQ_LT(th_ack, tp->gput_seq)) {
bytes = 0;
bytes_ps = 0;
rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
0, 0, 0, 10, __LINE__, NULL, quality);
goto skip_measurement;
} else
bytes = (th_ack - tp->gput_seq);
bytes_ps = (uint64_t)bytes;
if (rack->rc_gp_filled == 0) {
reqbytes -= (2 * segsiz);
rack->r_ctl.rc_prev_gp_srtt = rack->r_ctl.rc_gp_srtt;
}
if ((bytes_ps < reqbytes) || rack->app_limited_needs_set) {
rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
rack->r_ctl.rc_app_limited_cnt,
0, 0, 10, __LINE__, NULL, quality);
goto skip_measurement;
}
new_rtt_diff = (int32_t)rack->r_ctl.rc_gp_srtt - (int32_t)rack->r_ctl.rc_prev_gp_srtt;
if (rack->rc_gp_filled == 0) {
rack->r_ctl.rc_rtt_diff = new_rtt_diff;
} else {
if (rack->measure_saw_probe_rtt == 0) {
rack->r_ctl.rc_rtt_diff -= (rack->r_ctl.rc_rtt_diff / 8);
rack->r_ctl.rc_rtt_diff += (new_rtt_diff / 8);
}
}
timely_says = rack_make_timely_judgement(rack,
rack->r_ctl.rc_gp_srtt,
rack->r_ctl.rc_rtt_diff,
rack->r_ctl.rc_prev_gp_srtt
);
bytes_ps *= HPTS_USEC_IN_SEC;
bytes_ps /= utim;
if (bytes_ps > rack->r_ctl.last_max_bw) {
rack_log_pacing_delay_calc(rack, bytes, reqbytes,
bytes_ps, rack->r_ctl.last_max_bw, 0,
11, __LINE__, NULL, quality);
bytes_ps = rack->r_ctl.last_max_bw;
}
if (rack->rc_gp_filled == 0) {
if (bytes_ps) {
rack->r_ctl.gp_bw = bytes_ps;
rack->rc_gp_filled = 1;
rack->r_ctl.num_measurements = 1;
rack_set_pace_segments(rack->rc_tp, rack, __LINE__, NULL);
} else {
rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
rack->r_ctl.rc_app_limited_cnt,
0, 0, 10, __LINE__, NULL, quality);
}
if (tcp_in_hpts(rack->rc_tp) &&
(rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
tcp_hpts_remove(rack->rc_tp);
rack->r_ctl.rc_hpts_flags = 0;
rack->r_ctl.rc_last_output_to = 0;
}
did_add = 2;
} else if (rack->r_ctl.num_measurements < RACK_REQ_AVG) {
rack->r_ctl.gp_bw += bytes_ps;
addpart = rack->r_ctl.num_measurements;
rack->r_ctl.num_measurements++;
if (rack->r_ctl.num_measurements >= RACK_REQ_AVG) {
rack->r_ctl.gp_bw /= (uint64_t)rack->r_ctl.num_measurements;
}
rack_set_pace_segments(tp, rack, __LINE__, NULL);
did_add = 3;
} else {
uint8_t meth;
if (rack->r_ctl.num_measurements < 0xff) {
rack->r_ctl.num_measurements++;
}
srtt = (uint64_t)tp->t_srtt;
if (srtt == 0) {
if (rack->r_ctl.rc_rack_min_rtt)
srtt = rack->r_ctl.rc_rack_min_rtt;
else
srtt = HPTS_USEC_IN_MSEC;
}
if (rack->rc_gp_dyn_mul == 0) {
subpart = rack->r_ctl.gp_bw * utim;
subpart /= (srtt * 8);
if (subpart < (rack->r_ctl.gp_bw / 2)) {
addpart = bytes_ps * utim;
addpart /= (srtt * 8);
meth = 1;
} else {
subpart = rack->r_ctl.gp_bw / 2;
addpart = bytes_ps / 2;
meth = 2;
}
rack_log_gp_calc(rack, addpart, subpart, srtt, bytes_ps, utim, meth, __LINE__);
resid_bw = rack->r_ctl.gp_bw - subpart;
rack->r_ctl.gp_bw = resid_bw + addpart;
did_add = 1;
} else {
if ((utim / srtt) <= 1) {
subpart = rack->r_ctl.gp_bw * utim;
subpart /= (srtt * rack_wma_divisor);
addpart = bytes_ps * utim;
addpart /= (srtt * rack_wma_divisor);
meth = 3;
} else {
subpart = rack->r_ctl.gp_bw / rack_wma_divisor;
addpart = bytes_ps / rack_wma_divisor;
meth = 4;
}
if ((rack->measure_saw_probe_rtt == 0) ||
(bytes_ps > rack->r_ctl.gp_bw)) {
did_add = 1;
rack_log_gp_calc(rack, addpart, subpart, srtt, bytes_ps, utim, meth, __LINE__);
resid_bw = rack->r_ctl.gp_bw - subpart;
rack->r_ctl.gp_bw = resid_bw + addpart;
}
}
rack_set_pace_segments(tp, rack, __LINE__, NULL);
}
if ((rack->rc_initial_ss_comp == 0) &&
(rack->r_ctl.num_measurements >= RACK_REQ_AVG)) {
uint64_t gp_est;
gp_est = bytes_ps;
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.flex1 = rack->r_ctl.current_round;
log.u_bbr.flex2 = rack->r_ctl.last_rnd_of_gp_rise;
log.u_bbr.delRate = gp_est;
log.u_bbr.cur_del_rate = rack->r_ctl.last_gpest;
log.u_bbr.flex8 = 41;
(void)tcp_log_event(tp, NULL, NULL, NULL, BBR_LOG_CWND, 0,
0, &log, false, NULL, __func__, __LINE__,&tv);
}
if ((rack->r_ctl.num_measurements == RACK_REQ_AVG) ||
(rack->r_ctl.last_gpest == 0)) {
rack->r_ctl.last_rnd_of_gp_rise = rack->r_ctl.current_round;
rack->r_ctl.last_gpest = rack->r_ctl.gp_bw;
} else if (gp_est >= rack->r_ctl.last_gpest) {
gp_est *= 1000;
gp_est /= rack->r_ctl.last_gpest;
if ((uint32_t)gp_est > rack->r_ctl.gp_gain_req) {
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.flex1 = rack->r_ctl.current_round;
log.u_bbr.flex2 = (uint32_t)gp_est;
log.u_bbr.flex3 = rack->r_ctl.gp_gain_req;
log.u_bbr.delRate = gp_est;
log.u_bbr.cur_del_rate = rack->r_ctl.last_gpest;
log.u_bbr.flex8 = 42;
(void)tcp_log_event(tp, NULL, NULL, NULL, BBR_LOG_CWND, 0,
0, &log, false, NULL, __func__, __LINE__,&tv);
}
rack->r_ctl.last_rnd_of_gp_rise = rack->r_ctl.current_round;
if (rack->r_ctl.use_gp_not_last == 1)
rack->r_ctl.last_gpest = rack->r_ctl.gp_bw;
else
rack->r_ctl.last_gpest = bytes_ps;
}
}
}
if ((rack->gp_ready == 0) &&
(rack->r_ctl.num_measurements >= rack->r_ctl.req_measurements)) {
rack->gp_ready = 1;
if (rack->dgp_on ||
rack->rack_hibeta)
rack_set_cc_pacing(rack);
if (rack->defer_options)
rack_apply_deferred_options(rack);
}
rack_log_pacing_delay_calc(rack, subpart, addpart, bytes_ps, stim,
rack_get_bw(rack), 22, did_add, NULL, quality);
if ((rack->measure_saw_probe_rtt == 0) &&
rack->rc_gp_rtt_set) {
if (rack->rc_skip_timely == 0) {
rack_update_multiplier(rack, timely_says, bytes_ps,
rack->r_ctl.rc_gp_srtt,
rack->r_ctl.rc_rtt_diff);
}
}
rack_log_pacing_delay_calc(rack, bytes, tim, bytes_ps, stim,
rack_get_bw(rack), 3, line, NULL, quality);
rack_log_pacing_delay_calc(rack,
bytes,
tim,
bytes_ps,
rack->r_ctl.gp_bw,
rack_get_lt_bw(rack),
20, line, NULL, 0);
rack->r_ctl.rc_prev_gp_srtt = rack->r_ctl.rc_gp_srtt;
rack->r_ctl.rc_loss_at_start = rack->r_ctl.rc_loss_count;
skip_measurement:
rack->rc_gp_rtt_set = 0;
rack->rc_gp_saw_rec = 0;
rack->rc_gp_saw_ca = 0;
rack->rc_gp_saw_ss = 0;
rack->rc_dragged_bottom = 0;
if (quality == RACK_QUALITY_HIGH) {
gput = (int32_t)((bytes_ps << 3) / (uint64_t)1000);
#ifdef STATS
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_GPUT,
gput);
if (tp->t_stats_gput_prev > 0)
stats_voi_update_abs_s32(tp->t_stats,
VOI_TCP_GPUT_ND,
((gput - tp->t_stats_gput_prev) * 100) /
tp->t_stats_gput_prev);
#endif
tp->t_stats_gput_prev = gput;
}
tp->t_flags &= ~TF_GPUTINPROG;
if (rack->r_ctl.rc_first_appl &&
TCPS_HAVEESTABLISHED(tp->t_state) &&
rack->r_ctl.rc_app_limited_cnt &&
(SEQ_GT(rack->r_ctl.rc_first_appl->r_start, th_ack)) &&
((rack->r_ctl.rc_first_appl->r_end - th_ack) >
max(rc_init_window(rack), (MIN_GP_WIN * segsiz)))) {
struct rack_sendmap *rsm;
rack->r_ctl.rc_gp_lowrtt = 0xffffffff;
rack->r_ctl.rc_gp_high_rwnd = rack->rc_tp->snd_wnd;
tp->gput_ts = tcp_tv_to_usec(&rack->r_ctl.act_rcv_time);
rack->app_limited_needs_set = 0;
tp->gput_seq = th_ack;
if (rack->in_probe_rtt)
rack->measure_saw_probe_rtt = 1;
else if ((rack->measure_saw_probe_rtt) &&
(SEQ_GEQ(tp->gput_seq, rack->r_ctl.rc_probertt_sndmax_atexit)))
rack->measure_saw_probe_rtt = 0;
if ((rack->r_ctl.rc_first_appl->r_end - th_ack) >= rack_get_measure_window(tp, rack)) {
tp->gput_ack = tp->gput_seq + rack_get_measure_window(tp, rack);
} else {
tp->gput_ack = tp->gput_seq + (rack->r_ctl.rc_first_appl->r_end - th_ack);
if ((tp->gput_ack - tp->gput_seq) < (MIN_GP_WIN * segsiz)) {
tp->t_flags &= ~TF_GPUTINPROG;
rack_log_pacing_delay_calc(rack, tp->gput_ack, tp->gput_seq,
0, 0, 0, 6, __LINE__, NULL, quality);
return;
}
}
if (tp->t_state >= TCPS_FIN_WAIT_1) {
if (sbavail(&tptosocket(tp)->so_snd) < (tp->gput_ack - tp->gput_seq)) {
return;
}
}
tp->t_flags |= TF_GPUTINPROG;
rack->r_ctl.rc_gp_cumack_ts = 0;
rsm = tqhash_find(rack->r_ctl.tqh, tp->gput_seq);
if (rsm) {
if (SEQ_LT(rsm->r_start, tp->gput_seq)) {
tp->gput_seq = rsm->r_start;
}
if (rsm->r_flags & RACK_ACKED) {
struct rack_sendmap *nrsm;
tp->gput_ts = (uint32_t)rsm->r_ack_arrival;
tp->gput_seq = rsm->r_end;
nrsm = tqhash_next(rack->r_ctl.tqh, rsm);
if (nrsm)
rsm = nrsm;
else {
rack->app_limited_needs_set = 1;
}
} else
rack->app_limited_needs_set = 1;
rack->r_ctl.rc_gp_output_ts = rsm->r_tim_lastsent[0];
} else {
struct timeval tv;
microuptime(&tv);
rack->r_ctl.rc_gp_output_ts = rack_to_usec_ts(&tv);
}
rack_tend_gp_marks(tp, rack);
rack_log_pacing_delay_calc(rack,
tp->gput_seq,
tp->gput_ack,
(uintptr_t)rsm,
tp->gput_ts,
(((uint64_t)rack->r_ctl.rc_app_limited_cnt << 32) | (uint64_t)rack->r_ctl.rc_gp_output_ts),
9,
__LINE__, rsm, quality);
rack_log_gpset(rack, tp->gput_ack, 0, 0, __LINE__, 1, NULL);
} else {
rack_clear_gp_marks(tp, rack);
}
}
static void
rack_ack_received(struct tcpcb *tp, struct tcp_rack *rack, uint32_t th_ack, uint16_t nsegs,
uint16_t type, int32_t post_recovery)
{
uint32_t prior_cwnd, acked;
struct tcp_log_buffer *lgb = NULL;
uint8_t labc_to_use, quality;
INP_WLOCK_ASSERT(tptoinpcb(tp));
tp->t_ccv.nsegs = nsegs;
acked = tp->t_ccv.bytes_this_ack = (th_ack - tp->snd_una);
if ((post_recovery) && (rack->r_ctl.rc_early_recovery_segs)) {
uint32_t max;
max = rack->r_ctl.rc_early_recovery_segs * ctf_fixed_maxseg(tp);
if (tp->t_ccv.bytes_this_ack > max) {
tp->t_ccv.bytes_this_ack = max;
}
}
#ifdef STATS
stats_voi_update_abs_s32(tp->t_stats, VOI_TCP_CALCFRWINDIFF,
((int32_t)rack->r_ctl.cwnd_to_use) - tp->snd_wnd);
#endif
if ((th_ack == tp->snd_max) && rack->lt_bw_up) {
uint64_t tmark;
rack->r_ctl.lt_bw_bytes += (tp->snd_max - rack->r_ctl.lt_seq);
rack->r_ctl.lt_seq = tp->snd_max;
tmark = tcp_tv_to_lusec(&rack->r_ctl.act_rcv_time);
if (tmark >= rack->r_ctl.lt_timemark) {
rack->r_ctl.lt_bw_time += (tmark - rack->r_ctl.lt_timemark);
}
rack->r_ctl.lt_timemark = tmark;
rack->lt_bw_up = 0;
}
quality = RACK_QUALITY_NONE;
if ((tp->t_flags & TF_GPUTINPROG) &&
rack_enough_for_measurement(tp, rack, th_ack, &quality)) {
rack_do_goodput_measurement(tp, rack, th_ack, __LINE__, quality);
}
if (tp->snd_cwnd <= tp->snd_wnd)
tp->t_ccv.flags |= CCF_CWND_LIMITED;
else
tp->t_ccv.flags &= ~CCF_CWND_LIMITED;
if (tp->snd_cwnd > tp->snd_ssthresh) {
tp->t_bytes_acked += min(tp->t_ccv.bytes_this_ack,
nsegs * V_tcp_abc_l_var * ctf_fixed_maxseg(tp));
if (tp->t_bytes_acked >= rack->r_ctl.cwnd_to_use) {
tp->t_bytes_acked -= rack->r_ctl.cwnd_to_use;
tp->t_ccv.flags |= CCF_ABC_SENTAWND;
}
} else {
tp->t_ccv.flags &= ~CCF_ABC_SENTAWND;
tp->t_bytes_acked = 0;
}
prior_cwnd = tp->snd_cwnd;
if ((post_recovery == 0) || (rack_max_abc_post_recovery == 0) || rack->r_use_labc_for_rec ||
(rack_client_low_buf && rack->client_bufferlvl &&
(rack->client_bufferlvl < rack_client_low_buf)))
labc_to_use = rack->rc_labc;
else
labc_to_use = rack_max_abc_post_recovery;
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.flex1 = th_ack;
log.u_bbr.flex2 = tp->t_ccv.flags;
log.u_bbr.flex3 = tp->t_ccv.bytes_this_ack;
log.u_bbr.flex4 = tp->t_ccv.nsegs;
log.u_bbr.flex5 = labc_to_use;
log.u_bbr.flex6 = prior_cwnd;
log.u_bbr.flex7 = 1;
log.u_bbr.flex8 = 1;
lgb = tcp_log_event(tp, NULL, NULL, NULL, BBR_LOG_CWND, 0,
0, &log, false, NULL, __func__, __LINE__,&tv);
}
if (CC_ALGO(tp)->ack_received != NULL) {
tp->t_ccv.curack = th_ack;
tp->t_ccv.labc = labc_to_use;
tp->t_ccv.flags |= CCF_USE_LOCAL_ABC;
CC_ALGO(tp)->ack_received(&tp->t_ccv, type);
}
if (lgb) {
lgb->tlb_stackinfo.u_bbr.flex6 = tp->snd_cwnd;
}
if (rack->r_must_retran) {
if (SEQ_GEQ(th_ack, rack->r_ctl.rc_snd_max_at_rto)) {
rack->r_ctl.rc_out_at_rto = 0;
rack->r_must_retran = 0;
} else if ((prior_cwnd + ctf_fixed_maxseg(tp)) <= tp->snd_cwnd) {
if (acked <= rack->r_ctl.rc_out_at_rto){
rack->r_ctl.rc_out_at_rto -= acked;
} else {
rack->r_ctl.rc_out_at_rto = 0;
}
}
}
#ifdef STATS
stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_LCWIN, rack->r_ctl.cwnd_to_use);
#endif
if (rack->r_ctl.rc_rack_largest_cwnd < rack->r_ctl.cwnd_to_use) {
rack->r_ctl.rc_rack_largest_cwnd = rack->r_ctl.cwnd_to_use;
}
if ((rack->rc_initial_ss_comp == 0) &&
(tp->snd_cwnd >= tp->snd_ssthresh)) {
rack->rc_initial_ss_comp = 1;
}
}
static void
tcp_rack_partialack(struct tcpcb *tp)
{
struct tcp_rack *rack;
rack = (struct tcp_rack *)tp->t_fb_ptr;
INP_WLOCK_ASSERT(tptoinpcb(tp));
if ((rack->r_ctl.rc_prr_sndcnt > 0) ||
rack->rack_no_prr)
rack->r_wanted_output = 1;
}
static void
rack_exit_recovery(struct tcpcb *tp, struct tcp_rack *rack, int how)
{
EXIT_RECOVERY(tp->t_flags);
}
static void
rack_post_recovery(struct tcpcb *tp, uint32_t th_ack)
{
struct tcp_rack *rack;
uint32_t orig_cwnd;
orig_cwnd = tp->snd_cwnd;
INP_WLOCK_ASSERT(tptoinpcb(tp));
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (CC_ALGO(tp)->post_recovery != NULL) {
tp->t_ccv.curack = th_ack;
CC_ALGO(tp)->post_recovery(&tp->t_ccv);
if (tp->snd_cwnd < tp->snd_ssthresh) {
tp->snd_cwnd = tp->snd_ssthresh;
}
}
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.flex1 = th_ack;
log.u_bbr.flex2 = tp->t_ccv.flags;
log.u_bbr.flex3 = tp->t_ccv.bytes_this_ack;
log.u_bbr.flex4 = tp->t_ccv.nsegs;
log.u_bbr.flex5 = V_tcp_abc_l_var;
log.u_bbr.flex6 = orig_cwnd;
log.u_bbr.flex7 = 1;
log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex8 = 2;
tcp_log_event(tp, NULL, NULL, NULL, BBR_LOG_CWND, 0,
0, &log, false, NULL, __func__, __LINE__, &tv);
}
if ((rack->rack_no_prr == 0) &&
(rack->no_prr_addback == 0) &&
(rack->r_ctl.rc_prr_sndcnt > 0)) {
if (ctf_outstanding(tp) <= sbavail(&tptosocket(tp)->so_snd)) {
tp->snd_cwnd += min((ctf_fixed_maxseg(tp) * rack_prr_addbackmax),
rack->r_ctl.rc_prr_sndcnt);
}
rack->r_ctl.rc_prr_sndcnt = 0;
rack_log_to_prr(rack, 1, 0, __LINE__);
}
rack_log_to_prr(rack, 14, orig_cwnd, __LINE__);
tp->snd_recover = tp->snd_una;
if (rack->r_ctl.dsack_persist) {
rack->r_ctl.dsack_persist--;
if (rack->r_ctl.num_dsack && (rack->r_ctl.dsack_persist == 0)) {
rack->r_ctl.num_dsack = 0;
}
rack_log_dsack_event(rack, 1, __LINE__, 0, 0);
}
if (rack->rto_from_rec == 1) {
rack->rto_from_rec = 0;
if (rack->r_ctl.rto_ssthresh > tp->snd_ssthresh)
tp->snd_ssthresh = rack->r_ctl.rto_ssthresh;
}
rack_exit_recovery(tp, rack, 1);
}
static void
rack_cong_signal(struct tcpcb *tp, uint32_t type, uint32_t ack, int line)
{
struct tcp_rack *rack;
uint32_t ssthresh_enter, cwnd_enter, in_rec_at_entry, orig_cwnd;
INP_WLOCK_ASSERT(tptoinpcb(tp));
#ifdef STATS
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_CSIG, type);
#endif
if (IN_RECOVERY(tp->t_flags) == 0) {
in_rec_at_entry = 0;
ssthresh_enter = tp->snd_ssthresh;
cwnd_enter = tp->snd_cwnd;
} else
in_rec_at_entry = 1;
rack = (struct tcp_rack *)tp->t_fb_ptr;
switch (type) {
case CC_NDUPACK:
tp->t_flags &= ~TF_WASFRECOVERY;
tp->t_flags &= ~TF_WASCRECOVERY;
if (!IN_FASTRECOVERY(tp->t_flags)) {
if (rack->rc_initial_ss_comp == 0) {
rack->rc_initial_ss_comp = 1;
}
rack->r_ctl.rc_prr_delivered = 0;
rack->r_ctl.rc_prr_out = 0;
rack->r_fast_output = 0;
rack->r_ctl.recovery_rxt_cnt = 0;
if (rack->rack_no_prr == 0) {
rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
rack_log_to_prr(rack, 2, in_rec_at_entry, line);
}
rack->r_ctl.rc_prr_recovery_fs = tp->snd_max - tp->snd_una;
tp->snd_recover = tp->snd_max;
if (tp->t_flags2 & TF2_ECN_PERMIT)
tp->t_flags2 |= TF2_ECN_SND_CWR;
}
break;
case CC_ECN:
if (!IN_CONGRECOVERY(tp->t_flags) ||
SEQ_GEQ(ack, tp->snd_recover)) {
EXIT_CONGRECOVERY(tp->t_flags);
KMOD_TCPSTAT_INC(tcps_ecn_rcwnd);
rack->r_fast_output = 0;
tp->snd_recover = tp->snd_max + 1;
if (tp->t_flags2 & TF2_ECN_PERMIT)
tp->t_flags2 |= TF2_ECN_SND_CWR;
}
break;
case CC_RTO:
tp->t_dupacks = 0;
tp->t_bytes_acked = 0;
rack->r_fast_output = 0;
if (IN_RECOVERY(tp->t_flags))
rack_exit_recovery(tp, rack, 2);
orig_cwnd = tp->snd_cwnd;
rack_log_to_prr(rack, 16, orig_cwnd, line);
if (CC_ALGO(tp)->cong_signal == NULL) {
tp->snd_ssthresh = max(2,
min(tp->snd_wnd, rack->r_ctl.cwnd_to_use) / 2 /
ctf_fixed_maxseg(tp)) * ctf_fixed_maxseg(tp);
tp->snd_cwnd = ctf_fixed_maxseg(tp);
}
if (tp->t_flags2 & TF2_ECN_PERMIT)
tp->t_flags2 |= TF2_ECN_SND_CWR;
break;
case CC_RTO_ERR:
KMOD_TCPSTAT_INC(tcps_sndrexmitbad);
tp->snd_cwnd = tp->snd_cwnd_prev;
tp->snd_ssthresh = tp->snd_ssthresh_prev;
tp->snd_recover = tp->snd_recover_prev;
if (tp->t_flags & TF_WASFRECOVERY) {
ENTER_FASTRECOVERY(tp->t_flags);
tp->t_flags &= ~TF_WASFRECOVERY;
}
if (tp->t_flags & TF_WASCRECOVERY) {
ENTER_CONGRECOVERY(tp->t_flags);
tp->t_flags &= ~TF_WASCRECOVERY;
}
tp->snd_nxt = tp->snd_max;
tp->t_badrxtwin = 0;
break;
}
if ((CC_ALGO(tp)->cong_signal != NULL) &&
(type != CC_RTO)){
tp->t_ccv.curack = ack;
CC_ALGO(tp)->cong_signal(&tp->t_ccv, type);
}
if ((in_rec_at_entry == 0) && IN_RECOVERY(tp->t_flags)) {
rack_log_to_prr(rack, 15, cwnd_enter, line);
rack->r_ctl.dsack_byte_cnt = 0;
rack->r_ctl.retran_during_recovery = 0;
rack->r_ctl.rc_cwnd_at_erec = cwnd_enter;
rack->r_ctl.rc_ssthresh_at_erec = ssthresh_enter;
rack->r_ent_rec_ns = 1;
}
}
static inline void
rack_cc_after_idle(struct tcp_rack *rack, struct tcpcb *tp)
{
uint32_t i_cwnd;
INP_WLOCK_ASSERT(tptoinpcb(tp));
if (CC_ALGO(tp)->after_idle != NULL)
CC_ALGO(tp)->after_idle(&tp->t_ccv);
if (tp->snd_cwnd == 1)
i_cwnd = tp->t_maxseg;
else
i_cwnd = rc_init_window(rack);
if (tp->snd_cwnd < i_cwnd) {
tp->snd_cwnd = i_cwnd;
}
}
#define DELAY_ACK(tp, tlen) \
(((tp->t_flags & TF_RXWIN0SENT) == 0) && \
((tp->t_flags & TF_DELACK) == 0) && \
(tlen <= tp->t_maxseg) && \
(tp->t_delayed_ack || (tp->t_flags & TF_NEEDSYN)))
static struct rack_sendmap *
rack_find_lowest_rsm(struct tcp_rack *rack)
{
struct rack_sendmap *rsm;
TAILQ_FOREACH(rsm, &rack->r_ctl.rc_tmap, r_tnext) {
if (rsm->r_flags & RACK_ACKED) {
continue;
}
goto finish;
}
finish:
return (rsm);
}
static struct rack_sendmap *
rack_find_high_nonack(struct tcp_rack *rack, struct rack_sendmap *rsm)
{
struct rack_sendmap *prsm;
prsm = rsm;
TQHASH_FOREACH_REVERSE_FROM(prsm, rack->r_ctl.tqh) {
if (prsm->r_flags & (RACK_ACKED | RACK_HAS_FIN)) {
continue;
}
return (prsm);
}
return (NULL);
}
static uint32_t
rack_calc_thresh_rack(struct tcp_rack *rack, uint32_t srtt, uint32_t cts, int line, int log_allowed)
{
int32_t lro;
uint32_t thresh;
if (srtt == 0)
srtt = 1;
if (rack->r_ctl.rc_reorder_ts) {
if (rack->r_ctl.rc_reorder_fade) {
if (SEQ_GEQ(cts, rack->r_ctl.rc_reorder_ts)) {
lro = cts - rack->r_ctl.rc_reorder_ts;
if (lro == 0) {
lro = 1;
}
} else {
lro = 0;
}
if (lro > rack->r_ctl.rc_reorder_fade) {
rack->r_ctl.rc_reorder_ts = 0;
lro = 0;
}
} else {
lro = 1;
}
} else {
lro = 0;
}
if (rack->rc_rack_tmr_std_based == 0) {
thresh = srtt + rack->r_ctl.rc_pkt_delay;
} else {
thresh = srtt + (srtt >> 2);
}
if (lro && (rack->rc_rack_tmr_std_based == 0)) {
if (rack->r_ctl.rc_reorder_shift)
thresh += (srtt >> rack->r_ctl.rc_reorder_shift);
else
thresh += (srtt >> 2);
}
if (rack->rc_rack_use_dsack &&
lro &&
(rack->r_ctl.num_dsack > 0)) {
thresh += rack->r_ctl.num_dsack * (srtt >> 2);
if (log_allowed)
rack_log_dsack_event(rack, 4, line, srtt, thresh);
}
if (thresh > (srtt * 2)) {
thresh = srtt * 2;
}
if (thresh > rack_rto_max) {
thresh = rack_rto_max;
}
if (log_allowed)
rack_log_dsack_event(rack, 6, line, srtt, thresh);
return (thresh);
}
static uint32_t
rack_calc_thresh_tlp(struct tcpcb *tp, struct tcp_rack *rack,
struct rack_sendmap *rsm, uint32_t srtt)
{
struct rack_sendmap *prsm;
uint32_t thresh, len;
int segsiz;
if (srtt == 0)
srtt = 1;
if (rack->r_ctl.rc_tlp_threshold)
thresh = srtt + (srtt / rack->r_ctl.rc_tlp_threshold);
else
thresh = (srtt * 2);
segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
len = rsm->r_end - rsm->r_start;
if (rack->rack_tlp_threshold_use == TLP_USE_ID) {
if (((tp->snd_max - tp->snd_una) - rack->r_ctl.rc_sacked + rack->r_ctl.rc_holes_rxt) <= segsiz) {
uint32_t alt_thresh;
alt_thresh = srtt + (srtt / 2) + rack_delayed_ack_time;
if (alt_thresh > thresh)
thresh = alt_thresh;
}
} else if (rack->rack_tlp_threshold_use == TLP_USE_TWO_ONE) {
prsm = TAILQ_PREV(rsm, rack_head, r_tnext);
if (prsm && (len <= segsiz)) {
uint32_t inter_gap = 0;
int idx, nidx;
idx = rsm->r_rtr_cnt - 1;
nidx = prsm->r_rtr_cnt - 1;
if (rsm->r_tim_lastsent[nidx] >= prsm->r_tim_lastsent[idx]) {
inter_gap = rsm->r_tim_lastsent[idx] - prsm->r_tim_lastsent[nidx];
}
thresh += inter_gap;
} else if (len <= segsiz) {
uint32_t alt_thresh;
alt_thresh = srtt + (srtt / 2) + rack_delayed_ack_time;
if (alt_thresh > thresh)
thresh = alt_thresh;
}
} else if (rack->rack_tlp_threshold_use == TLP_USE_TWO_TWO) {
if (len <= segsiz) {
uint32_t alt_thresh;
alt_thresh = srtt + (srtt / 2) + rack_delayed_ack_time;
if (alt_thresh > thresh)
thresh = alt_thresh;
}
}
if (thresh > tp->t_rxtcur) {
thresh = tp->t_rxtcur;
}
if (thresh > rack_rto_max) {
thresh = rack_rto_max;
}
if (thresh < rack_tlp_min) {
thresh = rack_tlp_min;
}
return (thresh);
}
static uint32_t
rack_grab_rtt(struct tcpcb *tp, struct tcp_rack *rack)
{
if (rack->rc_rack_rtt)
return (rack->rc_rack_rtt);
else if (tp->t_srtt == 0)
return (RACK_INITIAL_RTO);
return (tp->t_srtt);
}
static struct rack_sendmap *
rack_check_recovery_mode(struct tcpcb *tp, uint32_t tsused)
{
struct tcp_rack *rack;
struct rack_sendmap *rsm;
int32_t idx;
uint32_t srtt, thresh;
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (tqhash_empty(rack->r_ctl.tqh)) {
return (NULL);
}
rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
if (rsm == NULL)
return (NULL);
if (rsm->r_flags & RACK_ACKED) {
rsm = rack_find_lowest_rsm(rack);
if (rsm == NULL)
return (NULL);
}
idx = rsm->r_rtr_cnt - 1;
srtt = rack_grab_rtt(tp, rack);
thresh = rack_calc_thresh_rack(rack, srtt, tsused, __LINE__, 1);
if (TSTMP_LT(tsused, ((uint32_t)rsm->r_tim_lastsent[idx]))) {
return (NULL);
}
if ((tsused - ((uint32_t)rsm->r_tim_lastsent[idx])) < thresh) {
return (NULL);
}
rack_cong_signal(tp, CC_NDUPACK, tp->snd_una, __LINE__);
return (rsm);
}
static uint32_t
rack_get_persists_timer_val(struct tcpcb *tp, struct tcp_rack *rack)
{
int32_t t;
int32_t tt;
uint32_t ret_val;
t = (tp->t_srtt + (tp->t_rttvar << 2));
RACK_TCPT_RANGESET(tt, t * tcp_backoff[tp->t_rxtshift],
rack_persist_min, rack_persist_max, rack->r_ctl.timer_slop);
rack->r_ctl.rc_hpts_flags |= PACE_TMR_PERSIT;
ret_val = (uint32_t)tt;
return (ret_val);
}
static uint32_t
rack_timer_start(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, int sup_rack)
{
uint32_t thresh, exp, to, srtt, time_since_sent, tstmp_touse;
uint32_t srtt_cur;
int32_t idx;
int32_t is_tlp_timer = 0;
struct rack_sendmap *rsm;
if (rack->t_timers_stopped) {
return (0);
}
if (rack->rc_in_persist) {
return (rack_get_persists_timer_val(tp, rack));
}
rack->rc_on_min_to = 0;
if ((tp->t_state < TCPS_ESTABLISHED) ||
((tp->t_flags & TF_SACK_PERMIT) == 0)) {
goto activate_rxt;
}
rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
if ((rsm == NULL) || sup_rack) {
activate_rxt:
time_since_sent = 0;
rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
if (rsm) {
idx = rsm->r_rtr_cnt - 1;
if (TSTMP_GEQ(rack->r_ctl.rc_tlp_rxt_last_time, ((uint32_t)rsm->r_tim_lastsent[idx])))
tstmp_touse = (uint32_t)rack->r_ctl.rc_tlp_rxt_last_time;
else
tstmp_touse = (uint32_t)rsm->r_tim_lastsent[idx];
if (TSTMP_GT(cts, tstmp_touse))
time_since_sent = cts - tstmp_touse;
}
if (SEQ_LT(tp->snd_una, tp->snd_max) ||
sbavail(&tptosocket(tp)->so_snd)) {
rack->r_ctl.rc_hpts_flags |= PACE_TMR_RXT;
to = tp->t_rxtcur;
if (to > time_since_sent)
to -= time_since_sent;
else
to = rack->r_ctl.rc_min_to;
if (to == 0)
to = 1;
if ((TCPS_HAVEESTABLISHED(tp->t_state) == 0) &&
(TP_KEEPINIT(tp) != 0) &&
rsm) {
uint32_t max_time, red;
max_time = TICKS_2_USEC(TP_KEEPINIT(tp));
if (TSTMP_GT(cts, (uint32_t)rsm->r_tim_lastsent[0])) {
red = (cts - (uint32_t)rsm->r_tim_lastsent[0]);
if (red < max_time)
max_time -= red;
else
max_time = 1;
}
if (max_time < to)
to = max_time;
}
return (to);
}
return (0);
}
if (rsm->r_flags & RACK_ACKED) {
rsm = rack_find_lowest_rsm(rack);
if (rsm == NULL) {
goto activate_rxt;
}
}
if ((rsm->r_flags & RACK_SACK_PASSED) ||
(rsm->r_flags & RACK_RWND_COLLAPSED) ||
(rsm->r_dupack >= DUP_ACK_THRESHOLD)) {
if ((tp->t_flags & TF_SENTFIN) &&
((tp->snd_max - tp->snd_una) == 1) &&
(rsm->r_flags & RACK_HAS_FIN)) {
goto activate_rxt;
}
if ((rack->use_rack_rr == 0) &&
(IN_FASTRECOVERY(tp->t_flags)) &&
(rack->rack_no_prr == 0) &&
(rack->r_ctl.rc_prr_sndcnt < ctf_fixed_maxseg(tp))) {
goto activate_tlp;
}
srtt = rack_grab_rtt(tp, rack);
thresh = rack_calc_thresh_rack(rack, srtt, cts, __LINE__, 1);
idx = rsm->r_rtr_cnt - 1;
exp = ((uint32_t)rsm->r_tim_lastsent[idx]) + thresh;
if (SEQ_GEQ(exp, cts)) {
to = exp - cts;
if (to < rack->r_ctl.rc_min_to) {
to = rack->r_ctl.rc_min_to;
if (rack->r_rr_config == 3)
rack->rc_on_min_to = 1;
}
} else {
to = rack->r_ctl.rc_min_to;
if (rack->r_rr_config == 3)
rack->rc_on_min_to = 1;
}
} else {
activate_tlp:
if ((rack->rc_tlp_in_progress != 0) &&
(rack->r_ctl.rc_tlp_cnt_out >= rack_tlp_limit)) {
goto activate_rxt;
}
rsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_tmap, rack_sendmap, r_tnext);
if (rsm == NULL) {
goto activate_rxt;
}
if (rsm->r_flags & RACK_HAS_FIN) {
rsm = NULL;
goto activate_rxt;
}
idx = rsm->r_rtr_cnt - 1;
time_since_sent = 0;
if (TSTMP_GEQ(((uint32_t)rsm->r_tim_lastsent[idx]), rack->r_ctl.rc_tlp_rxt_last_time))
tstmp_touse = (uint32_t)rsm->r_tim_lastsent[idx];
else
tstmp_touse = (uint32_t)rack->r_ctl.rc_tlp_rxt_last_time;
if (TSTMP_GT(cts, tstmp_touse))
time_since_sent = cts - tstmp_touse;
is_tlp_timer = 1;
if (tp->t_srtt) {
if ((rack->rc_srtt_measure_made == 0) &&
(tp->t_srtt == 1)) {
srtt = RACK_INITIAL_RTO;
} else {
srtt_cur = tp->t_srtt;
srtt = srtt_cur;
}
} else
srtt = RACK_INITIAL_RTO;
if (rack_tlp_use_greater &&
tp->t_srtt &&
(srtt < rack_grab_rtt(tp, rack))) {
srtt = rack_grab_rtt(tp, rack);
}
thresh = rack_calc_thresh_tlp(tp, rack, rsm, srtt);
if (thresh > time_since_sent) {
to = thresh - time_since_sent;
} else {
to = rack->r_ctl.rc_min_to;
rack_log_alt_to_to_cancel(rack,
thresh,
time_since_sent,
tstmp_touse,
rack->r_ctl.rc_tlp_rxt_last_time,
(uint32_t)rsm->r_tim_lastsent[idx],
srtt,
idx, 99);
}
if (to < rack_tlp_min) {
to = rack_tlp_min;
}
if (to > TICKS_2_USEC(tcp_rexmit_max)) {
goto activate_rxt;
}
}
if (is_tlp_timer == 0) {
rack->r_ctl.rc_hpts_flags |= PACE_TMR_RACK;
} else {
rack->r_ctl.rc_hpts_flags |= PACE_TMR_TLP;
}
if (to == 0)
to = 1;
return (to);
}
static void
rack_enter_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, tcp_seq snd_una)
{
if (rack->rc_in_persist == 0) {
if (tp->t_flags & TF_GPUTINPROG) {
rack_do_goodput_measurement(tp, rack, tp->snd_una, __LINE__,
RACK_QUALITY_PERSIST);
}
#ifdef NETFLIX_SHARED_CWND
if (rack->r_ctl.rc_scw) {
tcp_shared_cwnd_idle(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
rack->rack_scwnd_is_idle = 1;
}
#endif
rack->r_ctl.rc_went_idle_time = cts;
if (rack->r_ctl.rc_went_idle_time == 0)
rack->r_ctl.rc_went_idle_time = 1;
if (rack->lt_bw_up) {
uint64_t tmark;
rack->r_ctl.lt_bw_bytes += (snd_una - rack->r_ctl.lt_seq);
rack->r_ctl.lt_seq = snd_una;
tmark = tcp_tv_to_lusec(&rack->r_ctl.act_rcv_time);
if (tmark >= rack->r_ctl.lt_timemark) {
rack->r_ctl.lt_bw_time += (tmark - rack->r_ctl.lt_timemark);
}
rack->r_ctl.lt_timemark = tmark;
rack->lt_bw_up = 0;
rack->r_persist_lt_bw_off = 1;
}
rack_timer_cancel(tp, rack, cts, __LINE__);
rack->r_ctl.persist_lost_ends = 0;
rack->probe_not_answered = 0;
rack->forced_ack = 0;
tp->t_rxtshift = 0;
RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
rack->rc_in_persist = 1;
}
}
static void
rack_exit_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
{
if (tcp_in_hpts(rack->rc_tp)) {
tcp_hpts_remove(rack->rc_tp);
rack->r_ctl.rc_hpts_flags = 0;
}
#ifdef NETFLIX_SHARED_CWND
if (rack->r_ctl.rc_scw) {
tcp_shared_cwnd_active(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
rack->rack_scwnd_is_idle = 0;
}
#endif
if (rack->rc_gp_dyn_mul &&
(rack->use_fixed_rate == 0) &&
(rack->rc_always_pace)) {
uint32_t time_idle, idle_min;
time_idle = cts - rack->r_ctl.rc_went_idle_time;
idle_min = rack_min_probertt_hold;
if (rack_probertt_gpsrtt_cnt_div) {
uint64_t extra;
extra = (uint64_t)rack->r_ctl.rc_gp_srtt *
(uint64_t)rack_probertt_gpsrtt_cnt_mul;
extra /= (uint64_t)rack_probertt_gpsrtt_cnt_div;
idle_min += (uint32_t)extra;
}
if (time_idle >= idle_min) {
uint32_t us_cts;
us_cts = tcp_get_usecs(NULL);
if (rack->in_probe_rtt == 0) {
rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
rack->r_ctl.rc_time_probertt_entered = rack->r_ctl.rc_lower_rtt_us_cts;
rack->r_ctl.rc_time_probertt_starts = rack->r_ctl.rc_lower_rtt_us_cts;
rack->r_ctl.rc_time_of_last_probertt = rack->r_ctl.rc_lower_rtt_us_cts;
} else {
rack_exit_probertt(rack, us_cts);
}
}
}
if (rack->r_persist_lt_bw_off) {
rack->r_ctl.lt_timemark = tcp_get_u64_usecs(NULL);
rack->lt_bw_up = 1;
rack->r_persist_lt_bw_off = 0;
}
rack->rc_in_persist = 0;
rack->r_ctl.rc_went_idle_time = 0;
tp->t_rxtshift = 0;
RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
rack->r_ctl.rc_agg_delayed = 0;
rack->r_early = 0;
rack->r_late = 0;
rack->r_ctl.rc_agg_early = 0;
}
static void
rack_log_hpts_diag(struct tcp_rack *rack, uint32_t cts,
struct hpts_diag *diag, struct timeval *tv)
{
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = diag->p_nxt_slot;
log.u_bbr.flex2 = diag->p_cur_slot;
log.u_bbr.flex3 = diag->slot_req;
log.u_bbr.flex4 = diag->inp_hptsslot;
log.u_bbr.flex5 = diag->time_remaining;
log.u_bbr.flex6 = diag->need_new_to;
log.u_bbr.flex7 = diag->p_hpts_active;
log.u_bbr.flex8 = diag->p_on_min_sleep;
log.u_bbr.epoch = diag->have_slept;
log.u_bbr.lt_epoch = diag->yet_to_sleep;
log.u_bbr.pkts_out = diag->co_ret;
log.u_bbr.applimited = diag->hpts_sleep_time;
log.u_bbr.delivered = diag->p_prev_slot;
log.u_bbr.inflight = diag->p_runningslot;
log.u_bbr.bw_inuse = diag->wheel_slot;
log.u_bbr.rttProp = diag->wheel_cts;
log.u_bbr.timeStamp = cts;
log.u_bbr.delRate = diag->maxslots;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_HPTSDIAG, 0,
0, &log, false, tv);
}
}
static void
rack_log_wakeup(struct tcpcb *tp, struct tcp_rack *rack, struct sockbuf *sb, uint32_t len, int type)
{
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = sb->sb_flags;
log.u_bbr.flex2 = len;
log.u_bbr.flex3 = sb->sb_state;
log.u_bbr.flex8 = type;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
TCP_LOG_SB_WAKE, 0,
len, &log, false, &tv);
}
}
static void
rack_start_hpts_timer (struct tcp_rack *rack, struct tcpcb *tp, uint32_t cts,
int32_t usecs, uint32_t tot_len_this_send, int sup_rack)
{
struct hpts_diag diag;
struct inpcb *inp = tptoinpcb(tp);
struct timeval tv;
uint32_t delayed_ack = 0;
uint32_t hpts_timeout;
uint32_t entry_usecs = usecs;
uint8_t stopped;
uint32_t left = 0;
uint32_t us_cts;
if ((tp->t_state == TCPS_CLOSED) ||
(tp->t_state == TCPS_LISTEN)) {
return;
}
if (tcp_in_hpts(tp)) {
return;
}
stopped = rack->rc_tmr_stopped;
if (stopped && TSTMP_GT(rack->r_ctl.rc_timer_exp, cts)) {
left = rack->r_ctl.rc_timer_exp - cts;
}
rack->r_ctl.rc_timer_exp = 0;
rack->r_ctl.rc_hpts_flags = 0;
us_cts = tcp_get_usecs(&tv);
rack_log_pacing_delay_calc(rack, entry_usecs, usecs, 0, 0, 0, 26, __LINE__, NULL, 0);
if (rack->r_early && (rack->rc_ack_can_sendout_data == 0)) {
usecs += rack->r_ctl.rc_agg_early;
rack->r_early = 0;
rack->r_ctl.rc_agg_early = 0;
}
if ((rack->r_late) &&
((rack->r_use_hpts_min == 0) || (rack->dgp_on == 0))) {
if (rack->r_ctl.rc_agg_delayed >= usecs) {
if (usecs <= HPTS_USECS_PER_SLOT) {
rack->r_ctl.rc_agg_delayed += (HPTS_USECS_PER_SLOT - usecs);
usecs = HPTS_USECS_PER_SLOT;
} else {
rack->r_ctl.rc_agg_delayed -= (usecs - HPTS_USECS_PER_SLOT);
usecs = HPTS_USECS_PER_SLOT;
}
} else {
usecs -= rack->r_ctl.rc_agg_delayed;
rack->r_ctl.rc_agg_delayed = 0;
if (usecs < HPTS_USECS_PER_SLOT) {
rack->r_ctl.rc_agg_delayed = HPTS_USECS_PER_SLOT - usecs;
usecs = HPTS_USECS_PER_SLOT;
}
if (rack->r_ctl.rc_agg_delayed == 0)
rack->r_late = 0;
}
} else if (rack->r_late) {
uint32_t max_red;
max_red = (usecs * rack->r_ctl.max_reduction) / 100;
if (max_red >= rack->r_ctl.rc_agg_delayed) {
usecs -= rack->r_ctl.rc_agg_delayed;
rack->r_ctl.rc_agg_delayed = 0;
} else {
usecs -= max_red;
rack->r_ctl.rc_agg_delayed -= max_red;
}
}
if ((rack->r_use_hpts_min == 1) &&
(usecs > 0) &&
(rack->dgp_on == 1)) {
uint32_t min;
min = get_hpts_min_sleep_time();
if (min > usecs) {
usecs = min;
}
}
hpts_timeout = rack_timer_start(tp, rack, cts, sup_rack);
if (tp->t_flags & TF_DELACK) {
delayed_ack = TICKS_2_USEC(tcp_delacktime);
rack->r_ctl.rc_hpts_flags |= PACE_TMR_DELACK;
}
if (delayed_ack && ((hpts_timeout == 0) ||
(delayed_ack < hpts_timeout)))
hpts_timeout = delayed_ack;
else
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_DELACK;
if ((hpts_timeout == 0) &&
(usecs == 0)) {
if ((V_tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) &&
(tp->t_state <= TCPS_CLOSING)) {
if (TCPS_HAVEESTABLISHED(tp->t_state)) {
hpts_timeout = TICKS_2_USEC(TP_KEEPIDLE(tp));
} else {
hpts_timeout = TICKS_2_USEC(TP_KEEPINIT(tp));
}
rack->r_ctl.rc_hpts_flags |= PACE_TMR_KEEP;
if (rack->in_probe_rtt) {
hpts_timeout = rack_min_probertt_hold;
}
}
}
if (left && (stopped & (PACE_TMR_KEEP | PACE_TMR_DELACK)) ==
(rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK)) {
if (left < hpts_timeout)
hpts_timeout = left;
}
if (hpts_timeout) {
if (hpts_timeout > 0x7ffffffe)
hpts_timeout = 0x7ffffffe;
rack->r_ctl.rc_timer_exp = cts + hpts_timeout;
}
rack_log_pacing_delay_calc(rack, entry_usecs, usecs, hpts_timeout, 0, 0, 27, __LINE__, NULL, 0);
if ((rack->gp_ready == 0) &&
(rack->use_fixed_rate == 0) &&
(hpts_timeout < usecs) &&
(rack->r_ctl.rc_hpts_flags & (PACE_TMR_TLP|PACE_TMR_RXT))) {
usecs = hpts_timeout;
}
tp->t_flags2 &= ~(TF2_DONT_SACK_QUEUE|TF2_MBUF_QUEUE_READY);
if (usecs) {
rack->r_ctl.rc_hpts_flags |= PACE_PKT_OUTPUT;
rack->r_ctl.rc_last_output_to = us_cts + usecs;
tp->t_flags2 |= TF2_MBUF_QUEUE_READY;
if ((rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK) ||
(IN_RECOVERY(tp->t_flags))) {
if (rack->r_rr_config != 3)
tp->t_flags2 |= TF2_DONT_SACK_QUEUE;
else if (rack->rc_pace_dnd) {
tp->t_flags2 |= TF2_DONT_SACK_QUEUE;
}
}
if (rack->rc_ack_can_sendout_data) {
tp->t_flags2 &= ~(TF2_DONT_SACK_QUEUE |
TF2_MBUF_QUEUE_READY);
}
if ((rack->use_rack_rr) &&
(rack->r_rr_config < 2) &&
((hpts_timeout) && (hpts_timeout < usecs))) {
tcp_hpts_insert(tp, hpts_timeout, &diag);
rack_log_hpts_diag(rack, us_cts, &diag, &tv);
rack_log_to_start(rack, cts, hpts_timeout, usecs, 0);
} else {
tcp_hpts_insert(tp, usecs, &diag);
rack_log_hpts_diag(rack, us_cts, &diag, &tv);
rack_log_to_start(rack, cts, hpts_timeout, usecs, 1);
}
} else if (hpts_timeout) {
rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
tcp_hpts_insert(tp, hpts_timeout, &diag);
rack_log_hpts_diag(rack, us_cts, &diag, &tv);
rack_log_to_start(rack, cts, hpts_timeout, usecs, 0);
} else {
#ifdef INVARIANTS
if (SEQ_GT(tp->snd_max, tp->snd_una)) {
panic("tp:%p rack:%p tlts:%d cts:%u usecs:%u pto:%u -- no timer started?",
tp, rack, tot_len_this_send, cts, usecs, hpts_timeout);
}
#endif
}
rack->rc_tmr_stopped = 0;
if (usecs)
rack_log_type_bbrsnd(rack, tot_len_this_send, usecs, us_cts, &tv, __LINE__);
}
static void
rack_mark_lost(struct tcpcb *tp,
struct tcp_rack *rack, struct rack_sendmap *rsm, uint32_t cts)
{
struct rack_sendmap *nrsm;
uint32_t thresh, exp;
thresh = rack_calc_thresh_rack(rack, rack_grab_rtt(tp, rack), cts, __LINE__, 0);
nrsm = rsm;
TAILQ_FOREACH_FROM(nrsm, &rack->r_ctl.rc_tmap, r_tnext) {
if ((nrsm->r_flags & RACK_SACK_PASSED) == 0) {
break;
}
if ((nrsm->r_flags & RACK_WAS_LOST) == 0) {
exp = ((uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]) + thresh;
if (TSTMP_LT(exp, cts) || (exp == cts)) {
nrsm->r_flags |= RACK_WAS_LOST;
rack->r_ctl.rc_considered_lost += nrsm->r_end - nrsm->r_start;
} else {
break;
}
}
}
}
static inline void
rack_mark_nolonger_lost(struct tcp_rack *rack, struct rack_sendmap *rsm)
{
KASSERT((rack->r_ctl.rc_considered_lost >= (rsm->r_end - rsm->r_start)),
("rsm:%p rack:%p rc_considered_lost goes negative", rsm, rack));
rsm->r_flags &= ~RACK_WAS_LOST;
if (rack->r_ctl.rc_considered_lost >= (rsm->r_end - rsm->r_start))
rack->r_ctl.rc_considered_lost -= rsm->r_end - rsm->r_start;
else
rack->r_ctl.rc_considered_lost = 0;
}
static int
rack_timeout_rack(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
{
struct rack_sendmap *rsm;
counter_u64_add(rack_to_tot, 1);
if (rack->r_state && (rack->r_state != tp->t_state))
rack_set_state(tp, rack);
rack->rc_on_min_to = 0;
rsm = rack_check_recovery_mode(tp, cts);
rack_log_to_event(rack, RACK_TO_FRM_RACK, rsm);
if (rsm) {
rack_mark_lost(tp, rack, rsm, cts);
rack->r_ctl.rc_resend = rsm;
rack->r_timer_override = 1;
if (rack->use_rack_rr) {
rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
}
}
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_RACK;
if (rsm == NULL) {
rack_start_hpts_timer(rack, tp, cts,
0, 0, 0);
return (1);
}
return (0);
}
static void
rack_adjust_orig_mlen(struct rack_sendmap *rsm)
{
if ((M_TRAILINGROOM(rsm->m) != rsm->orig_t_space)) {
KASSERT((rsm->orig_t_space > M_TRAILINGROOM(rsm->m)),
("mbuf:%p rsm:%p trailing_space:%jd ots:%u oml:%u mlen:%u\n",
rsm->m,
rsm,
(intmax_t)M_TRAILINGROOM(rsm->m),
rsm->orig_t_space,
rsm->orig_m_len,
rsm->m->m_len));
rsm->orig_m_len += (rsm->orig_t_space - M_TRAILINGROOM(rsm->m));
rsm->orig_t_space = M_TRAILINGROOM(rsm->m);
}
if (rsm->m->m_len < rsm->orig_m_len) {
KASSERT((rsm->soff >= (rsm->orig_m_len - rsm->m->m_len)),
("mbuf:%p len:%u rsm:%p oml:%u soff:%u\n",
rsm->m, rsm->m->m_len,
rsm, rsm->orig_m_len,
rsm->soff));
if (rsm->soff >= (rsm->orig_m_len - rsm->m->m_len))
rsm->soff -= (rsm->orig_m_len - rsm->m->m_len);
else
rsm->soff = 0;
rsm->orig_m_len = rsm->m->m_len;
#ifdef INVARIANTS
} else if (rsm->m->m_len > rsm->orig_m_len) {
panic("rsm:%p m:%p m_len grew outside of t_space compensation",
rsm, rsm->m);
#endif
}
}
static void
rack_setup_offset_for_rsm(struct tcp_rack *rack, struct rack_sendmap *src_rsm, struct rack_sendmap *rsm)
{
struct mbuf *m;
uint32_t soff;
if (src_rsm->m &&
((src_rsm->orig_m_len != src_rsm->m->m_len) ||
(M_TRAILINGROOM(src_rsm->m) != src_rsm->orig_t_space))) {
rack_adjust_orig_mlen(src_rsm);
}
m = src_rsm->m;
soff = src_rsm->soff + (src_rsm->r_end - src_rsm->r_start);
while (soff >= m->m_len) {
soff -= m->m_len;
m = m->m_next;
KASSERT((m != NULL),
("rsm:%p nrsm:%p hit at soff:%u null m",
src_rsm, rsm, soff));
if (m == NULL) {
src_rsm->m = sbsndmbuf(&rack->rc_inp->inp_socket->so_snd,
(src_rsm->r_start - rack->rc_tp->snd_una),
&src_rsm->soff);
src_rsm->orig_m_len = src_rsm->m->m_len;
src_rsm->orig_t_space = M_TRAILINGROOM(src_rsm->m);
rsm->m = sbsndmbuf(&rack->rc_inp->inp_socket->so_snd,
(rsm->r_start - rack->rc_tp->snd_una),
&rsm->soff);
rsm->orig_m_len = rsm->m->m_len;
rsm->orig_t_space = M_TRAILINGROOM(rsm->m);
return;
}
}
rsm->m = m;
rsm->soff = soff;
rsm->orig_m_len = m->m_len;
rsm->orig_t_space = M_TRAILINGROOM(rsm->m);
}
static inline void
rack_clone_rsm(struct tcp_rack *rack, struct rack_sendmap *nrsm,
struct rack_sendmap *rsm, uint32_t start)
{
int idx;
nrsm->r_start = start;
nrsm->r_end = rsm->r_end;
nrsm->r_rtr_cnt = rsm->r_rtr_cnt;
nrsm->r_act_rxt_cnt = rsm->r_act_rxt_cnt;
nrsm->r_flags = rsm->r_flags;
nrsm->r_dupack = rsm->r_dupack;
nrsm->r_no_rtt_allowed = rsm->r_no_rtt_allowed;
nrsm->r_rtr_bytes = 0;
nrsm->r_fas = rsm->r_fas;
nrsm->r_bas = rsm->r_bas;
tqhash_update_end(rack->r_ctl.tqh, rsm, nrsm->r_start);
nrsm->r_just_ret = rsm->r_just_ret;
for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) {
nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx];
}
if (nrsm->r_flags & RACK_HAS_SYN)
nrsm->r_flags &= ~RACK_HAS_SYN;
if (rsm->r_flags & RACK_HAS_FIN)
rsm->r_flags &= ~RACK_HAS_FIN;
if (rsm->r_flags & RACK_HAD_PUSH)
rsm->r_flags &= ~RACK_HAD_PUSH;
if (nrsm->r_flags & RACK_APP_LIMITED)
rack->r_ctl.rc_app_limited_cnt++;
nrsm->r_hw_tls = rsm->r_hw_tls;
KASSERT(((rsm->m != NULL) ||
(rsm->r_flags & (RACK_HAS_SYN|RACK_HAS_FIN))),
("rsm:%p nrsm:%p rack:%p -- rsm->m is NULL?", rsm, nrsm, rack));
if (rsm->m)
rack_setup_offset_for_rsm(rack, rsm, nrsm);
}
static struct rack_sendmap *
rack_merge_rsm(struct tcp_rack *rack,
struct rack_sendmap *l_rsm,
struct rack_sendmap *r_rsm)
{
rack_log_map_chg(rack->rc_tp, rack, NULL,
l_rsm, r_rsm, MAP_MERGE, r_rsm->r_end, __LINE__);
tqhash_update_end(rack->r_ctl.tqh, l_rsm, r_rsm->r_end);
if (l_rsm->r_dupack < r_rsm->r_dupack)
l_rsm->r_dupack = r_rsm->r_dupack;
if (r_rsm->r_rtr_bytes)
l_rsm->r_rtr_bytes += r_rsm->r_rtr_bytes;
if (r_rsm->r_in_tmap) {
TAILQ_REMOVE(&rack->r_ctl.rc_tmap, r_rsm, r_tnext);
r_rsm->r_in_tmap = 0;
}
if (r_rsm->r_flags & RACK_HAS_FIN)
l_rsm->r_flags |= RACK_HAS_FIN;
if (r_rsm->r_flags & RACK_TLP)
l_rsm->r_flags |= RACK_TLP;
if (r_rsm->r_flags & RACK_RWND_COLLAPSED)
l_rsm->r_flags |= RACK_RWND_COLLAPSED;
if ((r_rsm->r_flags & RACK_APP_LIMITED) &&
((l_rsm->r_flags & RACK_APP_LIMITED) == 0)) {
l_rsm->r_flags |= RACK_APP_LIMITED;
r_rsm->r_flags &= ~RACK_APP_LIMITED;
if (r_rsm == rack->r_ctl.rc_first_appl)
rack->r_ctl.rc_first_appl = l_rsm;
}
tqhash_remove(rack->r_ctl.tqh, r_rsm, REMOVE_TYPE_MERGE);
if(l_rsm->r_tim_lastsent[(l_rsm->r_rtr_cnt-1)] <
r_rsm->r_tim_lastsent[(r_rsm->r_rtr_cnt-1)]) {
l_rsm->r_tim_lastsent[(l_rsm->r_rtr_cnt-1)] = r_rsm->r_tim_lastsent[(r_rsm->r_rtr_cnt-1)];
}
if(l_rsm->r_ack_arrival < r_rsm->r_ack_arrival)
l_rsm->r_ack_arrival = r_rsm->r_ack_arrival;
if ((r_rsm->r_limit_type == 0) && (l_rsm->r_limit_type != 0)) {
r_rsm->r_limit_type = l_rsm->r_limit_type;
l_rsm->r_limit_type = 0;
}
rack_free(rack, r_rsm);
l_rsm->r_flags |= RACK_MERGED;
return (l_rsm);
}
static int
rack_timeout_tlp(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, uint8_t *doing_tlp)
{
struct rack_sendmap *rsm = NULL;
int insret __diagused;
struct socket *so = tptosocket(tp);
uint32_t amm;
uint32_t out, avail;
int collapsed_win = 0;
if (TSTMP_LT(cts, rack->r_ctl.rc_timer_exp)) {
return (0);
}
if (ctf_progress_timeout_check(tp, true)) {
rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
return (-ETIMEDOUT);
}
rack_log_to_event(rack, RACK_TO_FRM_TLP, NULL);
rack->r_ctl.retran_during_recovery = 0;
rack->r_might_revert = 0;
rack->r_ctl.dsack_byte_cnt = 0;
counter_u64_add(rack_tlp_tot, 1);
if (rack->r_state && (rack->r_state != tp->t_state))
rack_set_state(tp, rack);
avail = sbavail(&so->so_snd);
out = tp->snd_max - tp->snd_una;
if ((out > tp->snd_wnd) || rack->rc_has_collapsed) {
collapsed_win = 1;
goto need_retran;
}
if (rack->r_ctl.dsack_persist && (rack->r_ctl.rc_tlp_cnt_out >= 1)) {
rack->r_ctl.dsack_persist--;
if (rack->r_ctl.num_dsack && (rack->r_ctl.dsack_persist == 0)) {
rack->r_ctl.num_dsack = 0;
}
rack_log_dsack_event(rack, 1, __LINE__, 0, 0);
}
if ((tp->t_flags & TF_GPUTINPROG) &&
(rack->r_ctl.rc_tlp_cnt_out == 1)) {
tp->t_flags &= ~TF_GPUTINPROG;
rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) ,
rack->r_ctl.rc_gp_srtt ,
tp->gput_seq,
0, 0, 18, __LINE__, NULL, 0);
}
if (rack_always_send_oldest && (TAILQ_EMPTY(&rack->r_ctl.rc_tmap) == 0))
goto need_retran;
if (avail > out) {
amm = avail - out;
if (amm > ctf_fixed_maxseg(tp)) {
amm = ctf_fixed_maxseg(tp);
if ((amm + out) > tp->snd_wnd) {
goto need_retran;
}
} else if (amm < ctf_fixed_maxseg(tp)) {
goto need_retran;
}
if (IN_FASTRECOVERY(tp->t_flags)) {
if (rack->rack_no_prr == 0) {
if (out + amm <= tp->snd_wnd) {
rack->r_ctl.rc_prr_sndcnt = amm;
rack->r_ctl.rc_tlp_new_data = amm;
rack_log_to_prr(rack, 4, 0, __LINE__);
}
} else
goto need_retran;
} else {
if (out + amm <= tp->snd_wnd)
rack->r_ctl.rc_tlp_new_data = amm;
else
goto need_retran;
}
rack->r_ctl.rc_tlpsend = NULL;
counter_u64_add(rack_tlp_newdata, 1);
goto send;
}
need_retran:
if (collapsed_win == 0) {
if (rack_always_send_oldest)
rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
else {
rsm = tqhash_max(rack->r_ctl.tqh);
if (rsm && (rsm->r_flags & (RACK_ACKED | RACK_HAS_FIN))) {
rsm = rack_find_high_nonack(rack, rsm);
}
}
if (rsm == NULL) {
#ifdef TCP_BLACKBOX
tcp_log_dump_tp_logbuf(tp, "nada counter trips", M_NOWAIT, true);
#endif
goto out;
}
} else {
if (SEQ_GT((rack->r_ctl.last_collapse_point - 1), rack->rc_tp->snd_una))
rsm = tqhash_find(rack->r_ctl.tqh, (rack->r_ctl.last_collapse_point - 1));
else {
rsm = tqhash_min(rack->r_ctl.tqh);
}
if (rsm == NULL) {
goto out;
}
}
if ((rsm->r_end - rsm->r_start) > ctf_fixed_maxseg(tp)) {
struct rack_sendmap *nrsm;
nrsm = rack_alloc_full_limit(rack);
if (nrsm == NULL) {
goto out;
}
rack_clone_rsm(rack, nrsm, rsm,
(rsm->r_end - ctf_fixed_maxseg(tp)));
rack_log_map_chg(tp, rack, NULL, rsm, nrsm, MAP_SPLIT, 0, __LINE__);
#ifndef INVARIANTS
(void)tqhash_insert(rack->r_ctl.tqh, nrsm);
#else
if ((insret = tqhash_insert(rack->r_ctl.tqh, nrsm)) != 0) {
panic("Insert in tailq_hash of %p fails ret:%d rack:%p rsm:%p",
nrsm, insret, rack, rsm);
}
#endif
if (rsm->r_in_tmap) {
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
nrsm->r_in_tmap = 1;
}
rsm = nrsm;
}
rack->r_ctl.rc_tlpsend = rsm;
send:
*doing_tlp = 1;
rack->r_timer_override = 1;
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP;
return (0);
out:
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP;
return (0);
}
static int
rack_timeout_delack(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
{
rack_log_to_event(rack, RACK_TO_FRM_DELACK, NULL);
tp->t_flags &= ~TF_DELACK;
tp->t_flags |= TF_ACKNOW;
KMOD_TCPSTAT_INC(tcps_delack);
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_DELACK;
return (0);
}
static inline int
rack_send_ack_challange(struct tcp_rack *rack)
{
struct tcptemp *t_template;
t_template = tcpip_maketemplate(rack->rc_inp);
if (t_template) {
if (rack->forced_ack == 0) {
rack->forced_ack = 1;
rack->r_ctl.forced_ack_ts = tcp_get_usecs(NULL);
} else {
rack->probe_not_answered = 1;
}
tcp_respond(rack->rc_tp, t_template->tt_ipgen,
&t_template->tt_t, (struct mbuf *)NULL,
rack->rc_tp->rcv_nxt, rack->rc_tp->snd_una - 1, 0);
free(t_template, M_TEMP);
if (rack->rc_tp->t_flags & TF_DELACK)
rack->rc_tp->t_flags &= ~TF_DELACK;
return(1);
} else
return (0);
}
static int
rack_timeout_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
{
int32_t retval = 1;
if (rack->rc_in_persist == 0)
return (0);
if (ctf_progress_timeout_check(tp, false)) {
tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX);
rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
counter_u64_add(rack_persists_lost_ends, rack->r_ctl.persist_lost_ends);
return (-ETIMEDOUT);
}
KMOD_TCPSTAT_INC(tcps_persisttimeo);
if (tp->t_rxtshift >= V_tcp_retries &&
(ticks - tp->t_rcvtime >= tcp_maxpersistidle ||
TICKS_2_USEC(ticks - tp->t_rcvtime) >= RACK_REXMTVAL(tp) * tcp_totbackoff)) {
KMOD_TCPSTAT_INC(tcps_persistdrop);
tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX);
counter_u64_add(rack_persists_lost_ends, rack->r_ctl.persist_lost_ends);
retval = -ETIMEDOUT;
goto out;
}
if ((sbavail(&rack->rc_inp->inp_socket->so_snd) == 0) &&
tp->snd_una == tp->snd_max)
rack_exit_persist(tp, rack, cts);
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_PERSIT;
if (tp->t_state > TCPS_CLOSE_WAIT &&
(ticks - tp->t_rcvtime) >= TCPTV_PERSMAX) {
KMOD_TCPSTAT_INC(tcps_persistdrop);
tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX);
counter_u64_add(rack_persists_lost_ends, rack->r_ctl.persist_lost_ends);
retval = -ETIMEDOUT;
goto out;
}
if (rack_send_ack_challange(rack)) {
if (rack->probe_not_answered) {
counter_u64_add(rack_persists_loss, 1);
rack->r_ctl.persist_lost_ends++;
}
counter_u64_add(rack_persists_sends, 1);
counter_u64_add(rack_out_size[TCP_MSS_ACCT_PERSIST], 1);
}
if (tp->t_rxtshift < V_tcp_retries)
tp->t_rxtshift++;
out:
rack_log_to_event(rack, RACK_TO_FRM_PERSIST, NULL);
rack_start_hpts_timer(rack, tp, cts,
0, 0, 0);
return (retval);
}
static int
rack_timeout_keepalive(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
{
struct inpcb *inp = tptoinpcb(tp);
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_KEEP;
rack_log_to_event(rack, RACK_TO_FRM_KEEP, NULL);
KMOD_TCPSTAT_INC(tcps_keeptimeo);
if (tp->t_state < TCPS_ESTABLISHED)
goto dropit;
if ((V_tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) &&
tp->t_state <= TCPS_CLOSING) {
if (ticks - tp->t_rcvtime >= TP_KEEPIDLE(tp) + TP_MAXIDLE(tp))
goto dropit;
KMOD_TCPSTAT_INC(tcps_keepprobe);
rack_send_ack_challange(rack);
}
rack_start_hpts_timer(rack, tp, cts, 0, 0, 0);
return (1);
dropit:
KMOD_TCPSTAT_INC(tcps_keepdrops);
tcp_log_end_status(tp, TCP_EI_STATUS_KEEP_MAX);
return (-ETIMEDOUT);
}
static void
rack_remxt_tmr(struct tcpcb *tp)
{
struct rack_sendmap *rsm, *trsm = NULL;
struct tcp_rack *rack;
rack = (struct tcp_rack *)tp->t_fb_ptr;
rack_timer_cancel(tp, rack, tcp_get_usecs(NULL), __LINE__);
rack_log_to_event(rack, RACK_TO_FRM_TMR, NULL);
rack->r_timer_override = 1;
rack->r_ctl.rc_snd_max_at_rto = tp->snd_max;
rack->r_ctl.rc_last_timeout_snduna = tp->snd_una;
rack->r_late = 0;
rack->r_early = 0;
rack->r_ctl.rc_agg_delayed = 0;
rack->r_ctl.rc_agg_early = 0;
if (rack->r_state && (rack->r_state != tp->t_state))
rack_set_state(tp, rack);
if (tp->t_rxtshift <= rack_rxt_scoreboard_clear_thresh) {
rack->r_ctl.rc_resend = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
if (rack->r_ctl.rc_resend != NULL)
rack->r_ctl.rc_resend->r_flags |= RACK_TO_REXT;
return;
}
TAILQ_INIT(&rack->r_ctl.rc_tmap);
rack->r_ctl.recovery_rxt_cnt = 0;
TQHASH_FOREACH(rsm, rack->r_ctl.tqh) {
rsm->r_dupack = 0;
if (rack_verbose_logging)
rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
if (trsm == NULL) {
TAILQ_INSERT_HEAD(&rack->r_ctl.rc_tmap, rsm, r_tnext);
} else {
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, trsm, rsm, r_tnext);
}
rsm->r_in_tmap = 1;
trsm = rsm;
if (rsm->r_flags & RACK_ACKED)
rsm->r_flags |= RACK_WAS_ACKED;
rsm->r_flags &= ~(RACK_ACKED | RACK_SACK_PASSED | RACK_WAS_SACKPASS | RACK_RWND_COLLAPSED | RACK_WAS_LOST);
rsm->r_flags |= RACK_MUST_RXT;
}
rack->r_ctl.rc_considered_lost = 0;
rack->r_ctl.rc_sacked = 0;
rack->r_ctl.rc_sacklast = NULL;
rack->r_ctl.rc_resend = tqhash_min(rack->r_ctl.tqh);
if (rack->r_ctl.rc_resend != NULL)
rack->r_ctl.rc_resend->r_flags |= RACK_TO_REXT;
rack->r_ctl.rc_prr_sndcnt = 0;
rack_log_to_prr(rack, 6, 0, __LINE__);
rack->r_ctl.rc_resend = tqhash_min(rack->r_ctl.tqh);
if (rack->r_ctl.rc_resend != NULL)
rack->r_ctl.rc_resend->r_flags |= RACK_TO_REXT;
if (((tp->t_flags & TF_SACK_PERMIT) == 0) &&
((tp->t_flags & TF_SENTFIN) == 0)) {
rack->r_must_retran = 1;
rack->r_ctl.rc_out_at_rto = ctf_flight_size(rack->rc_tp,
rack->r_ctl.rc_sacked);
}
}
static void
rack_convert_rtts(struct tcpcb *tp)
{
tcp_change_time_units(tp, TCP_TMR_GRANULARITY_USEC);
tp->t_rxtcur = RACK_REXMTVAL(tp);
if (TCPS_HAVEESTABLISHED(tp->t_state)) {
tp->t_rxtcur += TICKS_2_USEC(tcp_rexmit_slop);
}
if (tp->t_rxtcur > rack_rto_max) {
tp->t_rxtcur = rack_rto_max;
}
}
static void
rack_cc_conn_init(struct tcpcb *tp)
{
struct tcp_rack *rack;
uint32_t srtt;
rack = (struct tcp_rack *)tp->t_fb_ptr;
srtt = tp->t_srtt;
cc_conn_init(tp);
if ((srtt == 0) && (tp->t_srtt != 0))
rack_convert_rtts(tp);
if (tp->snd_ssthresh < tp->snd_wnd) {
tp->snd_ssthresh = tp->snd_wnd;
}
if (rc_init_window(rack) < tp->snd_cwnd)
tp->snd_cwnd = rc_init_window(rack);
}
static int
rack_timeout_rxt(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
{
struct inpcb *inp = tptoinpcb(tp);
int32_t rexmt;
int32_t retval = 0;
bool isipv6;
if ((tp->t_flags & TF_GPUTINPROG) &&
(tp->t_rxtshift)) {
tp->t_flags &= ~TF_GPUTINPROG;
rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) ,
rack->r_ctl.rc_gp_srtt ,
tp->gput_seq,
0, 0, 18, __LINE__, NULL, 0);
}
if (ctf_progress_timeout_check(tp, false)) {
tcp_log_end_status(tp, TCP_EI_STATUS_RETRAN);
rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
return (-ETIMEDOUT);
}
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_RXT;
rack->r_ctl.retran_during_recovery = 0;
rack->rc_ack_required = 1;
rack->r_ctl.dsack_byte_cnt = 0;
if (IN_RECOVERY(tp->t_flags) &&
(rack->rto_from_rec == 0)) {
rack->rto_from_rec = 1;
rack->r_ctl.rto_ssthresh = tp->snd_ssthresh;
}
if (IN_FASTRECOVERY(tp->t_flags))
tp->t_flags |= TF_WASFRECOVERY;
else
tp->t_flags &= ~TF_WASFRECOVERY;
if (IN_CONGRECOVERY(tp->t_flags))
tp->t_flags |= TF_WASCRECOVERY;
else
tp->t_flags &= ~TF_WASCRECOVERY;
if (TCPS_HAVEESTABLISHED(tp->t_state) &&
(tp->snd_una == tp->snd_max)) {
return (0);
}
if (rack->r_ctl.dsack_persist) {
rack->r_ctl.dsack_persist--;
if (rack->r_ctl.num_dsack && (rack->r_ctl.dsack_persist == 0)) {
rack->r_ctl.num_dsack = 0;
}
rack_log_dsack_event(rack, 1, __LINE__, 0, 0);
}
if ((TCPS_HAVEESTABLISHED(tp->t_state) == 0) &&
(TP_KEEPINIT(tp) != 0)) {
struct rack_sendmap *rsm;
rsm = tqhash_min(rack->r_ctl.tqh);
if (rsm) {
if ((TSTMP_GT(cts, (uint32_t)rsm->r_tim_lastsent[0])) &&
((cts - (uint32_t)rsm->r_tim_lastsent[0]) >= TICKS_2_USEC(TP_KEEPINIT(tp)))) {
tcp_log_end_status(tp, TCP_EI_STATUS_KEEP_MAX);
goto drop_it;
}
}
}
if ((rack->r_ctl.rc_resend == NULL) ||
((rack->r_ctl.rc_resend->r_flags & RACK_RWND_COLLAPSED) == 0)) {
tp->t_rxtshift++;
}
rack_remxt_tmr(tp);
if (tp->t_rxtshift > V_tcp_retries) {
tcp_log_end_status(tp, TCP_EI_STATUS_RETRAN);
drop_it:
tp->t_rxtshift = V_tcp_retries;
KMOD_TCPSTAT_INC(tcps_timeoutdrop);
MPASS(tp->t_softerror >= 0);
retval = tp->t_softerror ? -tp->t_softerror : -ETIMEDOUT;
goto out;
}
if (tp->t_state == TCPS_SYN_SENT) {
tp->snd_cwnd = 1;
} else if (tp->t_rxtshift == 1) {
tp->snd_cwnd_prev = tp->snd_cwnd;
tp->snd_ssthresh_prev = tp->snd_ssthresh;
tp->snd_recover_prev = tp->snd_recover;
tp->t_badrxtwin = ticks + (USEC_2_TICKS(tp->t_srtt)/2);
tp->t_flags |= TF_PREVVALID;
} else if ((tp->t_flags & TF_RCVD_TSTMP) == 0)
tp->t_flags &= ~TF_PREVVALID;
KMOD_TCPSTAT_INC(tcps_rexmttimeo);
if ((tp->t_state == TCPS_SYN_SENT) ||
(tp->t_state == TCPS_SYN_RECEIVED))
rexmt = RACK_INITIAL_RTO * tcp_backoff[tp->t_rxtshift];
else
rexmt = max(rack_rto_min, (tp->t_srtt + (tp->t_rttvar << 2))) * tcp_backoff[tp->t_rxtshift];
RACK_TCPT_RANGESET(tp->t_rxtcur, rexmt,
max(rack_rto_min, rexmt), rack_rto_max, rack->r_ctl.timer_slop);
#ifdef INET6
isipv6 = (inp->inp_vflag & INP_IPV6) ? true : false;
#else
isipv6 = false;
#endif
if (((V_tcp_pmtud_blackhole_detect == 1) ||
(V_tcp_pmtud_blackhole_detect == 2 && !isipv6) ||
(V_tcp_pmtud_blackhole_detect == 3 && isipv6)) &&
((tp->t_state == TCPS_ESTABLISHED) ||
(tp->t_state == TCPS_FIN_WAIT_1))) {
if (((tp->t_flags2 & (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) ==
(TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) &&
(tp->t_rxtshift >= 2 && tp->t_rxtshift < 6 &&
tp->t_rxtshift % 2 == 0)) {
if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) == 0) {
tp->t_flags2 |= TF2_PLPMTU_BLACKHOLE;
tp->t_pmtud_saved_maxseg = tp->t_maxseg;
}
#ifdef INET6
if (isipv6 &&
tp->t_maxseg > V_tcp_v6pmtud_blackhole_mss) {
tp->t_maxseg = V_tcp_v6pmtud_blackhole_mss;
KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated);
} else if (isipv6) {
tp->t_maxseg = V_tcp_v6mssdflt;
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss);
}
#endif
#if defined(INET6) && defined(INET)
else
#endif
#ifdef INET
if (tp->t_maxseg > V_tcp_pmtud_blackhole_mss) {
tp->t_maxseg = V_tcp_pmtud_blackhole_mss;
KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated);
} else {
tp->t_maxseg = V_tcp_mssdflt;
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss);
}
#endif
} else {
if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) &&
(tp->t_rxtshift >= 6)) {
tp->t_flags2 |= TF2_PLPMTU_PMTUD;
tp->t_flags2 &= ~TF2_PLPMTU_BLACKHOLE;
tp->t_maxseg = tp->t_pmtud_saved_maxseg;
if (tp->t_maxseg < V_tcp_mssdflt) {
tp->t_flags2 |= TF2_PROC_SACK_PROHIBIT;
} else {
tp->t_flags2 &= ~TF2_PROC_SACK_PROHIBIT;
}
KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_failed);
}
}
}
if (tcp_rexmit_drop_options && (tp->t_state == TCPS_SYN_SENT) &&
(tp->t_rxtshift == 3))
tp->t_flags &= ~(TF_REQ_SCALE|TF_REQ_TSTMP|TF_SACK_PERMIT);
if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) {
#ifdef INET6
if ((inp->inp_vflag & INP_IPV6) != 0)
in6_losing(inp);
else
#endif
in_losing(inp);
tp->t_rttvar += tp->t_srtt;
tp->t_srtt = 0;
}
sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
tp->snd_recover = tp->snd_max;
tp->t_flags |= TF_ACKNOW;
tp->t_rtttime = 0;
rack_cong_signal(tp, CC_RTO, tp->snd_una, __LINE__);
out:
return (retval);
}
static int
rack_process_timers(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, uint8_t hpts_calling, uint8_t *doing_tlp)
{
int32_t ret = 0;
int32_t timers = (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK);
if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
(tp->t_flags & TF_GPUTINPROG)) {
uint32_t bytes;
bytes = tp->gput_ack - tp->gput_seq;
if (SEQ_GT(tp->gput_seq, tp->snd_una))
bytes += tp->gput_seq - tp->snd_una;
if (bytes > sbavail(&tptosocket(tp)->so_snd)) {
rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) ,
rack->r_ctl.rc_gp_srtt ,
tp->gput_seq,
0, 0, 18, __LINE__, NULL, 0);
tp->t_flags &= ~TF_GPUTINPROG;
}
}
if (timers == 0) {
return (0);
}
if (tp->t_state == TCPS_LISTEN) {
if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)
return (0);
return (1);
}
if ((timers & PACE_TMR_RACK) &&
rack->rc_on_min_to) {
goto skip_time_check;
}
if (TSTMP_LT(cts, rack->r_ctl.rc_timer_exp)) {
uint32_t left;
if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
ret = -1;
rack_log_to_processing(rack, cts, ret, 0);
return (0);
}
if (hpts_calling == 0) {
ret = -2;
rack_log_to_processing(rack, cts, ret, 0);
return (0);
}
rack->rc_tp->t_flags2 &= ~TF2_DONT_SACK_QUEUE;
ret = -3;
left = rack->r_ctl.rc_timer_exp - cts;
tcp_hpts_insert(tp, left, NULL);
rack_log_to_processing(rack, cts, ret, left);
return (1);
}
skip_time_check:
rack->rc_tmr_stopped = 0;
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_MASK;
if (timers & PACE_TMR_DELACK) {
ret = rack_timeout_delack(tp, rack, cts);
} else if (timers & PACE_TMR_RACK) {
rack->r_ctl.rc_tlp_rxt_last_time = cts;
rack->r_fast_output = 0;
ret = rack_timeout_rack(tp, rack, cts);
} else if (timers & PACE_TMR_TLP) {
rack->r_ctl.rc_tlp_rxt_last_time = cts;
rack->r_fast_output = 0;
ret = rack_timeout_tlp(tp, rack, cts, doing_tlp);
} else if (timers & PACE_TMR_RXT) {
rack->r_ctl.rc_tlp_rxt_last_time = cts;
rack->r_fast_output = 0;
ret = rack_timeout_rxt(tp, rack, cts);
} else if (timers & PACE_TMR_PERSIT) {
ret = rack_timeout_persist(tp, rack, cts);
} else if (timers & PACE_TMR_KEEP) {
ret = rack_timeout_keepalive(tp, rack, cts);
}
rack_log_to_processing(rack, cts, ret, timers);
return (ret);
}
static void
rack_timer_cancel(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, int line)
{
struct timeval tv;
uint32_t us_cts, flags_on_entry;
uint8_t hpts_removed = 0;
flags_on_entry = rack->r_ctl.rc_hpts_flags;
us_cts = tcp_get_usecs(&tv);
if ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
((TSTMP_GEQ(us_cts, rack->r_ctl.rc_last_output_to)) ||
((tp->snd_max - tp->snd_una) == 0))) {
tcp_hpts_remove(rack->rc_tp);
hpts_removed = 1;
if ((tp->snd_max - tp->snd_una) == 0)
rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
rack_log_to_cancel(rack, hpts_removed, line, us_cts, &tv, flags_on_entry);
}
if (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) {
rack->rc_tmr_stopped = rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK;
if (tcp_in_hpts(rack->rc_tp) &&
((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0)) {
tcp_hpts_remove(rack->rc_tp);
hpts_removed = 1;
}
rack->r_ctl.rc_hpts_flags &= ~(PACE_TMR_MASK);
}
if (hpts_removed == 0)
rack_log_to_cancel(rack, hpts_removed, line, us_cts, &tv, flags_on_entry);
}
static int
rack_stopall(struct tcpcb *tp)
{
struct tcp_rack *rack;
rack = (struct tcp_rack *)tp->t_fb_ptr;
rack->t_timers_stopped = 1;
tcp_hpts_remove(tp);
return (0);
}
static void
rack_stop_all_timers(struct tcpcb *tp, struct tcp_rack *rack)
{
if (tcp_timer_active(tp, TT_PERSIST)) {
rack->rc_in_persist = 1;
}
if (tcp_in_hpts(rack->rc_tp)) {
tcp_hpts_remove(rack->rc_tp);
}
}
static void
rack_update_rsm(struct tcpcb *tp, struct tcp_rack *rack,
struct rack_sendmap *rsm, uint64_t ts, uint32_t add_flag, int segsiz)
{
int32_t idx;
rsm->r_rtr_cnt++;
if (rsm->r_rtr_cnt > RACK_NUM_OF_RETRANS) {
rsm->r_rtr_cnt = RACK_NUM_OF_RETRANS;
rsm->r_flags |= RACK_OVERMAX;
}
rsm->r_act_rxt_cnt++;
rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
rsm->r_dupack = 0;
if ((rsm->r_rtr_cnt > 1) && ((rsm->r_flags & RACK_TLP) == 0)) {
rack->r_ctl.rc_holes_rxt += (rsm->r_end - rsm->r_start);
rsm->r_rtr_bytes += (rsm->r_end - rsm->r_start);
}
if (rsm->r_flags & RACK_WAS_LOST) {
rack_mark_nolonger_lost(rack, rsm);
}
idx = rsm->r_rtr_cnt - 1;
rsm->r_tim_lastsent[idx] = ts;
rsm->r_fas = ctf_flight_size(rack->rc_tp,
rack->r_ctl.rc_sacked);
if (rsm->r_flags & RACK_ACKED) {
rsm->r_flags &= ~RACK_ACKED;
rack->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start);
}
if (rsm->r_in_tmap) {
TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 0;
}
rack_mark_in_gp_win(tp, rsm);
TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 1;
rsm->r_bas = (uint8_t)(((rsm->r_end - rsm->r_start) + segsiz - 1) / segsiz);
if (rsm->r_flags & RACK_MUST_RXT) {
if (rack->r_must_retran)
rack->r_ctl.rc_out_at_rto -= (rsm->r_end - rsm->r_start);
if (SEQ_GEQ(rsm->r_end, rack->r_ctl.rc_snd_max_at_rto)) {
rack->r_must_retran = 0;
rack->r_ctl.rc_out_at_rto = 0;
}
rsm->r_flags &= ~RACK_MUST_RXT;
}
rsm->r_flags &= ~RACK_RWND_COLLAPSED;
if (rsm->r_flags & RACK_SACK_PASSED) {
rsm->r_flags &= ~RACK_SACK_PASSED;
rsm->r_flags |= RACK_WAS_SACKPASS;
rack->r_ctl.recovery_rxt_cnt += (rsm->r_end - rsm->r_start);
}
}
static uint32_t
rack_update_entry(struct tcpcb *tp, struct tcp_rack *rack,
struct rack_sendmap *rsm, uint64_t ts, int32_t *lenp, uint32_t add_flag, int segsiz)
{
struct rack_sendmap *nrsm;
int insret __diagused;
uint32_t c_end;
int32_t len;
len = *lenp;
c_end = rsm->r_start + len;
if (SEQ_GEQ(c_end, rsm->r_end)) {
rack_update_rsm(tp, rack, rsm, ts, add_flag, segsiz);
if (c_end == rsm->r_end) {
*lenp = 0;
return (0);
} else {
int32_t act_len;
act_len = rsm->r_end - rsm->r_start;
*lenp = (len - act_len);
return (rsm->r_end);
}
}
nrsm = rack_alloc_full_limit(rack);
if (nrsm == NULL) {
*lenp = 0;
return (0);
}
rack_clone_rsm(rack, nrsm, rsm, c_end);
nrsm->r_dupack = 0;
rack_log_retran_reason(rack, nrsm, __LINE__, 0, 2);
#ifndef INVARIANTS
(void)tqhash_insert(rack->r_ctl.tqh, nrsm);
#else
if ((insret = tqhash_insert(rack->r_ctl.tqh, nrsm)) != 0) {
panic("Insert in tailq_hash of %p fails ret:%d rack:%p rsm:%p",
nrsm, insret, rack, rsm);
}
#endif
if (rsm->r_in_tmap) {
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
nrsm->r_in_tmap = 1;
}
rsm->r_flags &= (~RACK_HAS_FIN);
rack_update_rsm(tp, rack, rsm, ts, add_flag, segsiz);
rack_log_map_chg(tp, rack, NULL, rsm, nrsm, MAP_SPLIT, 0, __LINE__);
*lenp = 0;
return (0);
}
static void
rack_log_output(struct tcpcb *tp, struct tcpopt *to, int32_t len,
uint32_t seq_out, uint16_t th_flags, int32_t err, uint64_t cts,
struct rack_sendmap *hintrsm, uint32_t add_flag, struct mbuf *s_mb,
uint32_t s_moff, int hw_tls, int segsiz)
{
struct tcp_rack *rack;
struct rack_sendmap *rsm, *nrsm;
int insret __diagused;
register uint32_t snd_max, snd_una;
INP_WLOCK_ASSERT(tptoinpcb(tp));
if (err)
return;
if (th_flags & TH_RST) {
return;
}
rack = (struct tcp_rack *)tp->t_fb_ptr;
snd_una = tp->snd_una;
snd_max = tp->snd_max;
if (th_flags & (TH_SYN | TH_FIN)) {
if ((th_flags & TH_SYN) && (seq_out == tp->iss))
len++;
if (th_flags & TH_FIN)
len++;
}
if (SEQ_LEQ((seq_out + len), snd_una)) {
return;
}
if (SEQ_LT(seq_out, snd_una)) {
uint32_t end;
end = seq_out + len;
seq_out = snd_una;
if (SEQ_GEQ(end, seq_out))
len = end - seq_out;
else
len = 0;
}
if (len == 0) {
return;
}
if (IN_FASTRECOVERY(tp->t_flags)) {
rack->r_ctl.rc_prr_out += len;
}
if (seq_out == snd_max) {
rack_chk_req_and_hybrid_on_out(rack, seq_out, len, cts);
again:
rsm = rack_alloc(rack);
if (rsm == NULL) {
return;
}
if (th_flags & TH_FIN) {
rsm->r_flags = RACK_HAS_FIN|add_flag;
} else {
rsm->r_flags = add_flag;
}
if (hw_tls)
rsm->r_hw_tls = 1;
rsm->r_tim_lastsent[0] = cts;
rsm->r_rtr_cnt = 1;
rsm->r_act_rxt_cnt = 0;
rsm->r_rtr_bytes = 0;
if (th_flags & TH_SYN) {
rsm->r_flags |= RACK_HAS_SYN;
}
rsm->r_start = seq_out;
rsm->r_end = rsm->r_start + len;
rack_mark_in_gp_win(tp, rsm);
rsm->r_dupack = 0;
rsm->m = s_mb;
rsm->soff = s_moff;
rsm->r_fas = (ctf_flight_size(rack->rc_tp,
rack->r_ctl.rc_sacked) +
(rsm->r_end - rsm->r_start));
if ((rack->rc_initial_ss_comp == 0) &&
(rack->r_ctl.ss_hi_fs < rsm->r_fas)) {
rack->r_ctl.ss_hi_fs = rsm->r_fas;
}
if (rsm->m) {
if (rsm->m->m_len <= rsm->soff) {
struct mbuf *lm;
lm = rsm->m;
while (lm->m_len <= rsm->soff) {
rsm->soff -= lm->m_len;
lm = lm->m_next;
KASSERT(lm != NULL, ("%s rack:%p lm goes null orig_off:%u origmb:%p rsm->soff:%u",
__func__, rack, s_moff, s_mb, rsm->soff));
}
rsm->m = lm;
}
rsm->orig_m_len = rsm->m->m_len;
rsm->orig_t_space = M_TRAILINGROOM(rsm->m);
} else {
rsm->orig_m_len = 0;
rsm->orig_t_space = 0;
}
rsm->r_bas = (uint8_t)((len + segsiz - 1) / segsiz);
rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
rack_log_map_chg(tp, rack, NULL, rsm, NULL, MAP_NEW, 0, __LINE__);
#ifndef INVARIANTS
(void)tqhash_insert(rack->r_ctl.tqh, rsm);
#else
if ((insret = tqhash_insert(rack->r_ctl.tqh, rsm)) != 0) {
panic("Insert in tailq_hash of %p fails ret:%d rack:%p rsm:%p",
nrsm, insret, rack, rsm);
}
#endif
TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 1;
if (rsm->r_flags & RACK_IS_PCM) {
rack->r_ctl.pcm_i.send_time = cts;
rack->r_ctl.pcm_i.eseq = rsm->r_end;
if (rack->pcm_in_progress == 0)
rack->r_ctl.pcm_i.sseq = rsm->r_start;
}
if ((IN_FASTRECOVERY(tp->t_flags) == 0) &&
(ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) == ctf_fixed_maxseg(tp))) {
struct rack_sendmap *prsm;
prsm = tqhash_prev(rack->r_ctl.tqh, rsm);
if (prsm)
prsm->r_one_out_nr = 1;
}
return;
}
more:
if (hintrsm && (hintrsm->r_start == seq_out)) {
rsm = hintrsm;
hintrsm = NULL;
} else {
rsm = NULL;
}
if ((rsm) && (rsm->r_start == seq_out)) {
seq_out = rack_update_entry(tp, rack, rsm, cts, &len, add_flag, segsiz);
if (len == 0) {
return;
} else {
goto more;
}
}
refind:
rsm = tqhash_find(rack->r_ctl.tqh, seq_out);
if (rsm) {
if (rsm->r_start == seq_out) {
seq_out = rack_update_entry(tp, rack, rsm, cts, &len, add_flag, segsiz);
if (len == 0) {
return;
} else {
goto refind;
}
}
if (SEQ_GEQ(seq_out, rsm->r_start) && SEQ_LT(seq_out, rsm->r_end)) {
nrsm = rack_alloc_full_limit(rack);
if (nrsm == NULL) {
rack_update_rsm(tp, rack, rsm, cts, add_flag, segsiz);
return;
}
rack_clone_rsm(rack, nrsm, rsm, seq_out);
rack_log_map_chg(tp, rack, NULL, rsm, nrsm, MAP_SPLIT, 0, __LINE__);
#ifndef INVARIANTS
(void)tqhash_insert(rack->r_ctl.tqh, nrsm);
#else
if ((insret = tqhash_insert(rack->r_ctl.tqh, nrsm)) != 0) {
panic("Insert in tailq_hash of %p fails ret:%d rack:%p rsm:%p",
nrsm, insret, rack, rsm);
}
#endif
if (rsm->r_in_tmap) {
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
nrsm->r_in_tmap = 1;
}
rsm->r_flags &= (~RACK_HAS_FIN);
seq_out = rack_update_entry(tp, rack, nrsm, cts, &len, add_flag, segsiz);
if (len == 0) {
return;
} else if (len > 0)
goto refind;
}
}
if (seq_out == tp->snd_max) {
goto again;
} else if (SEQ_LT(seq_out, tp->snd_max)) {
#ifdef INVARIANTS
printf("seq_out:%u len:%d snd_una:%u snd_max:%u -- but rsm not found?\n",
seq_out, len, tp->snd_una, tp->snd_max);
printf("Starting Dump of all rack entries\n");
TQHASH_FOREACH(rsm, rack->r_ctl.tqh) {
printf("rsm:%p start:%u end:%u\n",
rsm, rsm->r_start, rsm->r_end);
}
printf("Dump complete\n");
panic("seq_out not found rack:%p tp:%p",
rack, tp);
#endif
} else {
#ifdef INVARIANTS
panic("seq_out:%u(%d) is beyond snd_max:%u tp:%p",
seq_out, len, tp->snd_max, tp);
#endif
}
}
static void
tcp_rack_xmit_timer(struct tcp_rack *rack, int32_t rtt, uint32_t len, uint32_t us_rtt,
int confidence, struct rack_sendmap *rsm, uint16_t rtrcnt)
{
if ((rack->r_ctl.rack_rs.rs_flags & RACK_RTT_EMPTY) ||
(rack->r_ctl.rack_rs.rs_rtt_lowest > rtt)) {
rack->r_ctl.rack_rs.rs_rtt_lowest = rtt;
}
if ((rack->r_ctl.rack_rs.rs_flags & RACK_RTT_EMPTY) ||
(rack->r_ctl.rack_rs.rs_rtt_highest < rtt)) {
rack->r_ctl.rack_rs.rs_rtt_highest = rtt;
}
if (rack->rc_tp->t_flags & TF_GPUTINPROG) {
if (us_rtt < rack->r_ctl.rc_gp_lowrtt)
rack->r_ctl.rc_gp_lowrtt = us_rtt;
if (rack->rc_tp->snd_wnd > rack->r_ctl.rc_gp_high_rwnd)
rack->r_ctl.rc_gp_high_rwnd = rack->rc_tp->snd_wnd;
}
if ((confidence == 1) &&
((rsm == NULL) ||
(rsm->r_just_ret) ||
(rsm->r_one_out_nr &&
len < (ctf_fixed_maxseg(rack->rc_tp) * 2)))) {
confidence = 0;
}
if ((rack->r_ctl.rack_rs.rs_flags & RACK_RTT_EMPTY) ||
(rack->r_ctl.rack_rs.rs_us_rtt > us_rtt)) {
if (rack->r_ctl.rack_rs.confidence == 0) {
rack->r_ctl.rack_rs.rs_us_rtt = us_rtt;
rack->r_ctl.rack_rs.confidence = confidence;
rack->r_ctl.rack_rs.rs_us_rtrcnt = rtrcnt;
} else if (confidence != 0) {
rack->r_ctl.rack_rs.rs_us_rtt = us_rtt;
rack->r_ctl.rack_rs.confidence = confidence;
rack->r_ctl.rack_rs.rs_us_rtrcnt = rtrcnt;
}
}
rack_log_rtt_upd(rack->rc_tp, rack, us_rtt, len, rsm, confidence);
rack->r_ctl.rack_rs.rs_flags = RACK_RTT_VALID;
rack->r_ctl.rack_rs.rs_rtt_tot += rtt;
rack->r_ctl.rack_rs.rs_rtt_cnt++;
}
static void
tcp_rack_xmit_timer_commit(struct tcp_rack *rack, struct tcpcb *tp)
{
int32_t delta;
int32_t rtt;
if (rack->r_ctl.rack_rs.rs_flags & RACK_RTT_EMPTY)
return;
if (rack->r_ctl.rc_rate_sample_method == USE_RTT_LOW) {
rtt = rack->r_ctl.rack_rs.rs_rtt_lowest;
} else if (rack->r_ctl.rc_rate_sample_method == USE_RTT_HIGH) {
rtt = rack->r_ctl.rack_rs.rs_rtt_highest;
} else if (rack->r_ctl.rc_rate_sample_method == USE_RTT_AVG) {
rtt = (int32_t)(rack->r_ctl.rack_rs.rs_rtt_tot /
(uint64_t)rack->r_ctl.rack_rs.rs_rtt_cnt);
} else {
#ifdef INVARIANTS
panic("Unknown rtt variant %d", rack->r_ctl.rc_rate_sample_method);
#endif
return;
}
if (rtt == 0)
rtt = 1;
if (rack->rc_gp_rtt_set == 0) {
rack->r_ctl.rc_gp_srtt = rack->r_ctl.rack_rs.rs_us_rtt;
rack->rc_gp_rtt_set = 1;
} else if (rack->r_ctl.rack_rs.confidence) {
rack->r_ctl.rc_gp_srtt -= (rack->r_ctl.rc_gp_srtt/8);
rack->r_ctl.rc_gp_srtt += rack->r_ctl.rack_rs.rs_us_rtt / 8;
}
if (rack->r_ctl.rack_rs.confidence) {
if (rack->r_ctl.rc_highest_us_rtt < rack->r_ctl.rack_rs.rs_us_rtt) {
rack->r_ctl.rc_highest_us_rtt = rack->r_ctl.rack_rs.rs_us_rtt;
}
if (rack->rc_highly_buffered == 0) {
if ((rack->r_ctl.rc_highest_us_rtt / rack->r_ctl.rc_lowest_us_rtt) > rack_hbp_thresh) {
rack_log_rtt_shrinks(rack, rack->r_ctl.rack_rs.rs_us_rtt,
rack->r_ctl.rc_highest_us_rtt,
rack->r_ctl.rc_lowest_us_rtt,
RACK_RTTS_SEEHBP);
rack->rc_highly_buffered = 1;
}
}
}
if ((rack->r_ctl.rack_rs.confidence) ||
(rack->r_ctl.rack_rs.rs_us_rtrcnt == 1)) {
rack->r_ctl.rc_last_us_rtt = rack->r_ctl.rack_rs.rs_us_rtt;
if (rack->r_ctl.rc_lowest_us_rtt > rack->r_ctl.rack_rs.rs_us_rtt) {
rack->r_ctl.rc_lowest_us_rtt = rack->r_ctl.rack_rs.rs_us_rtt;
if (rack->r_ctl.rc_lowest_us_rtt == 0)
rack->r_ctl.rc_lowest_us_rtt = 1;
}
}
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (tp->t_srtt != 0) {
delta = tp->t_srtt - rtt;
tp->t_srtt -= (tp->t_srtt >> 3);
tp->t_srtt += (rtt >> 3);
if (tp->t_srtt <= 0)
tp->t_srtt = 1;
if (delta < 0)
delta = -delta;
tp->t_rttvar -= (tp->t_rttvar >> 3);
tp->t_rttvar += (delta >> 3);
if (tp->t_rttvar <= 0)
tp->t_rttvar = 1;
} else {
tp->t_srtt = rtt;
tp->t_rttvar = rtt >> 1;
}
rack->rc_srtt_measure_made = 1;
KMOD_TCPSTAT_INC(tcps_rttupdated);
if (tp->t_rttupdated < UCHAR_MAX)
tp->t_rttupdated++;
#ifdef STATS
if (rack_stats_gets_ms_rtt == 0) {
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, rtt));
} else if (rack_stats_gets_ms_rtt == 1) {
int32_t ms_rtt;
ms_rtt = (rtt + HPTS_USEC_IN_MSEC - 1) / HPTS_USEC_IN_MSEC;
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, ms_rtt));
} else if (rack_stats_gets_ms_rtt == 2) {
int32_t ms_rtt;
ms_rtt = (rack->r_ctl.rack_rs.rs_us_rtt + HPTS_USEC_IN_MSEC - 1) / HPTS_USEC_IN_MSEC;
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, ms_rtt));
} else {
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, rack->r_ctl.rack_rs.rs_us_rtt));
}
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_PATHRTT, imax(0, rack->r_ctl.rack_rs.rs_us_rtt));
#endif
rack->r_ctl.last_rcv_tstmp_for_rtt = tcp_tv_to_msec(&rack->r_ctl.act_rcv_time);
tp->t_rxtshift = 0;
RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
max(rack_rto_min, rtt + 2), rack_rto_max, rack->r_ctl.timer_slop);
rack_log_rtt_sample(rack, rtt);
tp->t_softerror = 0;
}
static void
rack_apply_updated_usrtt(struct tcp_rack *rack, uint32_t us_rtt, uint32_t us_cts)
{
uint32_t old_rtt;
old_rtt = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
apply_filter_min_small(&rack->r_ctl.rc_gp_min_rtt,
us_rtt, us_cts);
if (old_rtt > us_rtt) {
rack_log_rtt_shrinks(rack, us_cts, old_rtt,
__LINE__, RACK_RTTS_NEWRTT);
if ((old_rtt - us_rtt) > rack_min_rtt_movement) {
if (rack_probertt_lower_within &&
rack->rc_gp_dyn_mul &&
(rack->use_fixed_rate == 0) &&
(rack->rc_always_pace)) {
uint32_t val;
val = rack_probertt_lower_within * rack_time_between_probertt;
val /= 100;
if ((rack->in_probe_rtt == 0) &&
(rack->rc_skip_timely == 0) &&
((us_cts - rack->r_ctl.rc_lower_rtt_us_cts) >= (rack_time_between_probertt - val))) {
rack_enter_probertt(rack, us_cts);
}
}
rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
}
}
}
static int
rack_update_rtt(struct tcpcb *tp, struct tcp_rack *rack,
struct rack_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type, tcp_seq th_ack)
{
uint32_t us_rtt;
int32_t i, all;
uint32_t t, len_acked;
if ((rsm->r_flags & RACK_ACKED) ||
(rsm->r_flags & RACK_WAS_ACKED))
return (0);
if (rsm->r_no_rtt_allowed) {
return (0);
}
if (ack_type == CUM_ACKED) {
if (SEQ_GT(th_ack, rsm->r_end)) {
len_acked = rsm->r_end - rsm->r_start;
all = 1;
} else {
len_acked = th_ack - rsm->r_start;
all = 0;
}
} else {
len_acked = rsm->r_end - rsm->r_start;
all = 0;
}
if (rsm->r_rtr_cnt == 1) {
t = cts - (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)];
if ((int)t <= 0)
t = 1;
if (!tp->t_rttlow || tp->t_rttlow > t)
tp->t_rttlow = t;
if (!rack->r_ctl.rc_rack_min_rtt ||
SEQ_LT(t, rack->r_ctl.rc_rack_min_rtt)) {
rack->r_ctl.rc_rack_min_rtt = t;
if (rack->r_ctl.rc_rack_min_rtt == 0) {
rack->r_ctl.rc_rack_min_rtt = 1;
}
}
if (TSTMP_GT(tcp_tv_to_usec(&rack->r_ctl.act_rcv_time), rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)]))
us_rtt = tcp_tv_to_usec(&rack->r_ctl.act_rcv_time) - (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)];
else
us_rtt = tcp_get_usecs(NULL) - (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)];
if (us_rtt == 0)
us_rtt = 1;
if (CC_ALGO(tp)->rttsample != NULL) {
CC_ALGO(tp)->rttsample(&tp->t_ccv, us_rtt, 1, rsm->r_fas);
}
rack_apply_updated_usrtt(rack, us_rtt, tcp_tv_to_usec(&rack->r_ctl.act_rcv_time));
if (ack_type == SACKED) {
rack_log_rtt_sample_calc(rack, t, (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)], cts, 1);
tcp_rack_xmit_timer(rack, t + 1, len_acked, us_rtt, 2 , rsm, rsm->r_rtr_cnt);
} else {
int calc_conf = 0;
if (rsm->r_flags & RACK_APP_LIMITED) {
if (all && (len_acked <= ctf_fixed_maxseg(tp)))
calc_conf = 0;
else
calc_conf = 1;
} else if (rack->app_limited_needs_set == 0) {
calc_conf = 1;
} else {
calc_conf = 0;
}
rack_log_rtt_sample_calc(rack, t, (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)], cts, 2);
tcp_rack_xmit_timer(rack, t + 1, len_acked, us_rtt,
calc_conf, rsm, rsm->r_rtr_cnt);
}
if ((rsm->r_flags & RACK_TLP) &&
(!IN_FASTRECOVERY(tp->t_flags))) {
if (rack->r_ctl.rc_tlp_cwnd_reduce) {
rack_cong_signal(tp, CC_NDUPACK, th_ack, __LINE__);
}
}
if ((rack->r_ctl.rc_rack_tmit_time == 0) ||
(SEQ_LT(rack->r_ctl.rc_rack_tmit_time,
(uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]))) {
rack->r_ctl.rc_rack_tmit_time = (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)];
if (rack->r_ctl.rc_rack_tmit_time == 0)
rack->r_ctl.rc_rack_tmit_time = 1;
rack->rc_rack_rtt = t;
}
return (1);
}
tp->t_rxtshift = 0;
RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
tp->t_softerror = 0;
if (to && (to->to_flags & TOF_TS) &&
(ack_type == CUM_ACKED) &&
(to->to_tsecr) &&
((rsm->r_flags & RACK_OVERMAX) == 0)) {
for (i = 0; i < rsm->r_rtr_cnt; i++) {
if (rack_ts_to_msec(rsm->r_tim_lastsent[i]) == to->to_tsecr) {
t = cts - (uint32_t)rsm->r_tim_lastsent[i];
if ((int)t <= 0)
t = 1;
if (CC_ALGO(tp)->rttsample != NULL) {
if (TSTMP_GT(tcp_tv_to_usec(&rack->r_ctl.act_rcv_time), rsm->r_tim_lastsent[i]))
us_rtt = tcp_tv_to_usec(&rack->r_ctl.act_rcv_time) - (uint32_t)rsm->r_tim_lastsent[i];
else
us_rtt = tcp_get_usecs(NULL) - (uint32_t)rsm->r_tim_lastsent[i];
CC_ALGO(tp)->rttsample(&tp->t_ccv, us_rtt, 1, rsm->r_fas);
}
if ((i + 1) < rsm->r_rtr_cnt) {
return (0);
}
if (!tp->t_rttlow || tp->t_rttlow > t)
tp->t_rttlow = t;
if (!rack->r_ctl.rc_rack_min_rtt || SEQ_LT(t, rack->r_ctl.rc_rack_min_rtt)) {
rack->r_ctl.rc_rack_min_rtt = t;
if (rack->r_ctl.rc_rack_min_rtt == 0) {
rack->r_ctl.rc_rack_min_rtt = 1;
}
}
if ((rack->r_ctl.rc_rack_tmit_time == 0) ||
(SEQ_LT(rack->r_ctl.rc_rack_tmit_time,
(uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]))) {
rack->r_ctl.rc_rack_tmit_time = (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)];
if (rack->r_ctl.rc_rack_tmit_time == 0)
rack->r_ctl.rc_rack_tmit_time = 1;
rack->rc_rack_rtt = t;
}
rack_log_rtt_sample_calc(rack, t, (uint32_t)rsm->r_tim_lastsent[i], cts, 3);
tcp_rack_xmit_timer(rack, t + 1, len_acked, t, 0, rsm,
rsm->r_rtr_cnt);
return (1);
}
}
if (tcp_bblogging_on(rack->rc_tp)) {
for (i = 0; i < rsm->r_rtr_cnt; i++) {
rack_log_rtt_sendmap(rack, i, rsm->r_tim_lastsent[i], to->to_tsecr);
}
}
goto ts_not_found;
} else {
ts_not_found:
i = rsm->r_rtr_cnt - 1;
t = cts - (uint32_t)rsm->r_tim_lastsent[i];
if ((int)t <= 0)
t = 1;
if (rack->r_ctl.rc_rack_min_rtt && SEQ_LT(t, rack->r_ctl.rc_rack_min_rtt)) {
return (0);
} else if (rack->r_ctl.rc_rack_min_rtt) {
if (!rack->r_ctl.rc_rack_min_rtt ||
SEQ_LT(t, rack->r_ctl.rc_rack_min_rtt)) {
rack->r_ctl.rc_rack_min_rtt = t;
if (rack->r_ctl.rc_rack_min_rtt == 0) {
rack->r_ctl.rc_rack_min_rtt = 1;
}
}
if ((rack->r_ctl.rc_rack_tmit_time == 0) ||
(SEQ_LT(rack->r_ctl.rc_rack_tmit_time,
(uint32_t)rsm->r_tim_lastsent[i]))) {
rack->r_ctl.rc_rack_tmit_time = (uint32_t)rsm->r_tim_lastsent[i];
if (rack->r_ctl.rc_rack_tmit_time == 0)
rack->r_ctl.rc_rack_tmit_time = 1;
rack->rc_rack_rtt = t;
}
return (1);
}
}
return (0);
}
static void
rack_log_sack_passed(struct tcpcb *tp,
struct tcp_rack *rack, struct rack_sendmap *rsm, uint32_t cts, int line)
{
struct rack_sendmap *nrsm;
uint32_t thresh;
thresh = rack_calc_thresh_rack(rack, rack_grab_rtt(tp, rack), cts, __LINE__, 0);
nrsm = rsm;
TAILQ_FOREACH_REVERSE_FROM(nrsm, &rack->r_ctl.rc_tmap,
rack_head, r_tnext) {
if (nrsm == rsm) {
continue;
}
if (nrsm->r_flags & RACK_ACKED) {
continue;
}
if (nrsm->r_flags & RACK_RWND_COLLAPSED) {
continue;
}
if ((nrsm->r_flags & RACK_WAS_LOST) == 0) {
uint32_t exp;
exp = ((uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]) + thresh;
if (TSTMP_LT(exp, cts) || (exp == cts)) {
nrsm->r_flags |= RACK_WAS_LOST;
rack->r_ctl.rc_considered_lost += nrsm->r_end - nrsm->r_start;
}
}
if (nrsm->r_flags & RACK_SACK_PASSED) {
break;
}
rack_log_dsack_event(rack, 12, __LINE__, nrsm->r_start, nrsm->r_end);
nrsm->r_flags |= RACK_SACK_PASSED;
nrsm->r_flags &= ~RACK_WAS_SACKPASS;
}
}
static void
rack_need_set_test(struct tcpcb *tp,
struct tcp_rack *rack,
struct rack_sendmap *rsm,
tcp_seq th_ack,
int line,
int use_which)
{
struct rack_sendmap *s_rsm;
if ((tp->t_flags & TF_GPUTINPROG) &&
SEQ_GEQ(rsm->r_end, tp->gput_seq)) {
uint32_t seq, ts;
if (rsm->r_rtr_cnt > 1) {
return;
}
seq = tp->gput_seq;
ts = tp->gput_ts;
rack->app_limited_needs_set = 0;
tp->gput_ts = tcp_tv_to_usec(&rack->r_ctl.act_rcv_time);
if ((use_which == RACK_USE_BEG) &&
SEQ_GEQ(rsm->r_start, tp->gput_seq)) {
tp->gput_seq = rsm->r_start;
}
if ((use_which == RACK_USE_END) &&
SEQ_GEQ(rsm->r_end, tp->gput_seq)) {
tp->gput_seq = rsm->r_end;
}
if (use_which == RACK_USE_END_OR_THACK) {
if (SEQ_GT(th_ack, rsm->r_end))
tp->gput_seq = th_ack;
else
tp->gput_seq = rsm->r_end;
}
if (SEQ_LT(tp->gput_seq, tp->snd_max))
s_rsm = tqhash_find(rack->r_ctl.tqh, tp->gput_seq);
else
s_rsm = NULL;
if (s_rsm)
rack->r_ctl.rc_gp_output_ts = s_rsm->r_tim_lastsent[0];
else {
rack->r_ctl.rc_gp_output_ts = rsm->r_tim_lastsent[0];
rack->app_limited_needs_set = 1;
}
if (SEQ_GT(tp->gput_seq, tp->gput_ack)) {
if (rack->rc_gp_filled == 0) {
tp->gput_ack = tp->gput_seq + max(rc_init_window(rack), (MIN_GP_WIN * ctf_fixed_maxseg(tp)));
} else {
tp->gput_ack = tp->gput_seq + rack_get_measure_window(tp, rack);
}
}
if ((rack->in_probe_rtt == 0) &&
(rack->measure_saw_probe_rtt) &&
(SEQ_GEQ(tp->gput_seq, rack->r_ctl.rc_probertt_sndmax_atexit)))
rack->measure_saw_probe_rtt = 0;
rack_log_pacing_delay_calc(rack, ts, tp->gput_ts,
seq, tp->gput_seq,
(((uint64_t)rack->r_ctl.rc_app_limited_cnt << 32) |
(uint64_t)rack->r_ctl.rc_gp_output_ts),
5, line, NULL, 0);
if (rack->rc_gp_filled &&
((tp->gput_ack - tp->gput_seq) <
max(rc_init_window(rack), (MIN_GP_WIN *
ctf_fixed_maxseg(tp))))) {
uint32_t ideal_amount;
ideal_amount = rack_get_measure_window(tp, rack);
if (ideal_amount > sbavail(&tptosocket(tp)->so_snd)) {
tp->t_flags &= ~TF_GPUTINPROG;
rack_log_pacing_delay_calc(rack, tp->gput_ack, tp->gput_seq,
0, 0,
(((uint64_t)rack->r_ctl.rc_app_limited_cnt << 32) |
(uint64_t)rack->r_ctl.rc_gp_output_ts),
6, __LINE__, NULL, 0);
} else {
tp->gput_ack = tp->gput_seq + ideal_amount;
}
}
rack_tend_gp_marks(tp, rack);
rack_log_gpset(rack, tp->gput_ack, 0, 0, line, 2, rsm);
}
}
static inline int
is_rsm_inside_declared_tlp_block(struct tcp_rack *rack, struct rack_sendmap *rsm)
{
if (SEQ_LT(rsm->r_end, rack->r_ctl.last_tlp_acked_start)) {
return (0);
}
if (SEQ_GT(rsm->r_start, rack->r_ctl.last_tlp_acked_end)) {
return (0);
}
return (1);
}
static int
rack_check_reorder_ack(struct tcpcb *tp, struct tcp_rack *rack, struct rack_sendmap *rsm, int the_end, uint32_t cts, int can_exit_recovery, int line)
{
if ((rack_rtt_divisor > 0) &&
(rsm->r_rtr_cnt == 2) &&
IN_RECOVERY(tp->t_flags) &&
(rsm->r_flags & RACK_WAS_SACKPASS)){
uint32_t fractional, snt_to_ack;
fractional = (tp->t_srtt / rack_rtt_divisor);
if (fractional == 0)
fractional = 1;
snt_to_ack = cts - (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)];
if (snt_to_ack <= fractional) {
rack->r_ctl.rc_reorder_ts = cts;
KASSERT((rack->r_ctl.recovery_rxt_cnt >= (the_end - rsm->r_start)),
("rsm:%p rack:%p recovery_rxt_cnt would go negative recovery_rxt_cnt:%u sub:%u", rsm, rack, rack->r_ctl.recovery_rxt_cnt, (the_end - rsm->r_start)));
rack->r_ctl.recovery_rxt_cnt -= (the_end - rsm->r_start);
rack_log_to_prr(rack, 18, rack->r_ctl.recovery_rxt_cnt, line);
if (can_exit_recovery && (rack->r_ctl.recovery_rxt_cnt == 0)) {
tp->snd_ssthresh = rack->r_ctl.rc_ssthresh_at_erec;
rack_exit_recovery(tp, rack, 4);
rack->r_might_revert = 0;
rack->r_ctl.retran_during_recovery = 0;
rack_log_to_prr(rack, 17, snt_to_ack, line);
}
return (1);
}
}
return (0);
}
static uint32_t
rack_proc_sack_blk(struct tcpcb *tp, struct tcp_rack *rack, struct sackblk *sack,
struct tcpopt *to, struct rack_sendmap **prsm, uint32_t cts,
uint32_t segsiz)
{
uint32_t start, end, changed = 0;
struct rack_sendmap stack_map;
struct rack_sendmap *rsm, *nrsm, *prev, *next;
int insret __diagused;
int32_t used_ref = 1;
int can_use_hookery = 0;
int prohibit_marking = 0;
start = sack->start;
end = sack->end;
rsm = *prsm;
do_rest_ofb:
if ((rsm == NULL) ||
(SEQ_LT(end, rsm->r_start)) ||
(SEQ_GEQ(start, rsm->r_end)) ||
(SEQ_LT(start, rsm->r_start))) {
used_ref = 0;
rsm = tqhash_find(rack->r_ctl.tqh, start);
}
if (rsm == NULL) {
goto out;
}
if (rsm->r_start != start) {
if ((rsm->r_flags & RACK_ACKED) == 0) {
if ((rsm->r_flags & RACK_TLP) &&
(rsm->r_rtr_cnt > 1)) {
if (rack->rc_last_tlp_acked_set &&
(is_rsm_inside_declared_tlp_block(rack, rsm))) {
rack_log_dsack_event(rack, 10, __LINE__, rsm->r_start, rsm->r_end);
if (SEQ_LT(rsm->r_start, rack->r_ctl.last_tlp_acked_start)) {
rack->r_ctl.last_tlp_acked_start = rsm->r_start;
rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
rack->r_ctl.last_tlp_acked_end);
}
if (SEQ_GT(rsm->r_end, rack->r_ctl.last_tlp_acked_end)) {
rack->r_ctl.last_tlp_acked_end = rsm->r_end;
rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
rack->r_ctl.last_tlp_acked_end);
}
} else {
rack->r_ctl.last_tlp_acked_start = rsm->r_start;
rack->r_ctl.last_tlp_acked_end = rsm->r_end;
rack->rc_last_tlp_past_cumack = 0;
rack->rc_last_tlp_acked_set = 1;
rack_log_dsack_event(rack, 8, __LINE__, rsm->r_start, rsm->r_end);
}
}
next = tqhash_next(rack->r_ctl.tqh, rsm);
if (next &&
(rsm->bindex == next->bindex) &&
((rsm->r_flags & RACK_STRADDLE) == 0) &&
((next->r_flags & RACK_STRADDLE) == 0) &&
((rsm->r_flags & RACK_WAS_SACKPASS) == 0) &&
((next->r_flags & RACK_WAS_SACKPASS) == 0) &&
((rsm->r_flags & RACK_IS_PCM) == 0) &&
((next->r_flags & RACK_IS_PCM) == 0) &&
(rsm->r_flags & RACK_IN_GP_WIN) &&
(next->r_flags & RACK_IN_GP_WIN))
can_use_hookery = 1;
else
can_use_hookery = 0;
if (next && can_use_hookery &&
(next->r_flags & RACK_ACKED) &&
SEQ_GEQ(end, next->r_start)) {
nrsm = &stack_map;
memcpy(nrsm, rsm, sizeof(struct rack_sendmap));
tqhash_update_end(rack->r_ctl.tqh, rsm, start);
next->r_start = start;
rsm->r_flags |= RACK_SHUFFLED;
next->r_flags |= RACK_SHUFFLED;
rack_setup_offset_for_rsm(rack, rsm, next);
if (next->r_tim_lastsent[(next->r_rtr_cnt-1)] <
nrsm->r_tim_lastsent[(nrsm->r_rtr_cnt-1)])
next->r_tim_lastsent[(next->r_rtr_cnt-1)] = nrsm->r_tim_lastsent[(nrsm->r_rtr_cnt-1)];
if (next->r_ack_arrival <
rack_to_usec_ts(&rack->r_ctl.act_rcv_time))
next->r_ack_arrival = rack_to_usec_ts(&rack->r_ctl.act_rcv_time);
rsm->r_dupack = 0;
rsm->r_just_ret = 0;
rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
nrsm->r_start = start;
prohibit_marking = rack_check_reorder_ack(tp, rack, nrsm, nrsm->r_end, cts, 0, __LINE__);
rack_update_rtt(tp, rack, nrsm, to, cts, SACKED, 0);
if (rack->app_limited_needs_set)
rack_need_set_test(tp, rack, nrsm, tp->snd_una, __LINE__, RACK_USE_END);
changed += (nrsm->r_end - nrsm->r_start);
rack->r_ctl.rc_sacked += (nrsm->r_end - nrsm->r_start);
if (rsm->r_flags & RACK_WAS_LOST) {
int my_chg;
my_chg = (nrsm->r_end - nrsm->r_start);
KASSERT((rack->r_ctl.rc_considered_lost >= my_chg),
("rsm:%p rack:%p rc_considered_lost goes negative", rsm, rack));
if (my_chg <= rack->r_ctl.rc_considered_lost)
rack->r_ctl.rc_considered_lost -= my_chg;
else
rack->r_ctl.rc_considered_lost = 0;
}
if (nrsm->r_flags & RACK_SACK_PASSED) {
rack->r_ctl.rc_reorder_ts = cts;
if (rack->r_ctl.rc_reorder_ts == 0)
rack->r_ctl.rc_reorder_ts = 1;
}
if (rsm->r_in_tmap) {
nrsm = TAILQ_NEXT(rsm, r_tnext);
if (nrsm && nrsm->r_in_tmap && (prohibit_marking == 0))
rack_log_sack_passed(tp, rack, nrsm, cts, __LINE__);
}
if (SEQ_LT(end, next->r_end) ||
(end == next->r_end)) {
goto out;
}
rack_log_map_chg(tp, rack, &stack_map, rsm, next, MAP_SACK_M1, end, __LINE__);
start = next->r_end;
rsm = tqhash_next(rack->r_ctl.tqh, next);
if (rsm == NULL)
goto out;
} else {
nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT);
if (nrsm == NULL) {
goto out;
}
rack_clone_rsm(rack, nrsm, rsm, start);
rsm->r_just_ret = 0;
#ifndef INVARIANTS
(void)tqhash_insert(rack->r_ctl.tqh, nrsm);
#else
if ((insret = tqhash_insert(rack->r_ctl.tqh, nrsm)) != 0) {
panic("Insert in tailq_hash of %p fails ret:%d rack:%p rsm:%p",
nrsm, insret, rack, rsm);
}
#endif
if (rsm->r_in_tmap) {
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
nrsm->r_in_tmap = 1;
}
rack_log_map_chg(tp, rack, NULL, rsm, nrsm, MAP_SACK_M2, end, __LINE__);
rsm->r_flags &= (~RACK_HAS_FIN);
prohibit_marking = rack_check_reorder_ack(tp, rack, nrsm, nrsm->r_end, cts, 0, __LINE__);
rsm = nrsm;
}
} else {
if (end == rsm->r_end) {
rsm = tqhash_next(rack->r_ctl.tqh, rsm);
goto out;
} else if (SEQ_LT(end, rsm->r_end)) {
rsm = tqhash_next(rack->r_ctl.tqh, rsm);
goto out;
} else {
start = rsm->r_end;
rsm = tqhash_next(rack->r_ctl.tqh, rsm);
if (rsm == NULL)
goto out;
}
}
}
if (SEQ_GEQ(end, rsm->r_end)) {
if ((rsm->r_flags & RACK_ACKED) == 0) {
if ((rsm->r_flags & RACK_TLP) &&
(rsm->r_rtr_cnt > 1)) {
if (rack->rc_last_tlp_acked_set &&
(is_rsm_inside_declared_tlp_block(rack, rsm))) {
rack_log_dsack_event(rack, 10, __LINE__, rsm->r_start, rsm->r_end);
if (SEQ_LT(rsm->r_start, rack->r_ctl.last_tlp_acked_start)) {
rack->r_ctl.last_tlp_acked_start = rsm->r_start;
rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
rack->r_ctl.last_tlp_acked_end);
}
if (SEQ_GT(rsm->r_end, rack->r_ctl.last_tlp_acked_end)) {
rack->r_ctl.last_tlp_acked_end = rsm->r_end;
rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
rack->r_ctl.last_tlp_acked_end);
}
} else {
rack->r_ctl.last_tlp_acked_start = rsm->r_start;
rack->r_ctl.last_tlp_acked_end = rsm->r_end;
rack->rc_last_tlp_past_cumack = 0;
rack->rc_last_tlp_acked_set = 1;
rack_log_dsack_event(rack, 8, __LINE__, rsm->r_start, rsm->r_end);
}
}
rack_update_rtt(tp, rack, rsm, to, cts, SACKED, 0);
changed += (rsm->r_end - rsm->r_start);
prohibit_marking = rack_check_reorder_ack(tp, rack, rsm, rsm->r_end, cts, 0, __LINE__);
if (rsm->r_flags & RACK_WAS_LOST) {
rack_mark_nolonger_lost(rack, rsm);
}
rack->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start);
if (rsm->r_in_tmap && (prohibit_marking == 0))
rack_log_sack_passed(tp, rack, rsm, cts, __LINE__);
if (rsm->r_flags & RACK_SACK_PASSED) {
rsm->r_flags &= ~RACK_SACK_PASSED;
rack->r_ctl.rc_reorder_ts = cts;
if (rack->r_ctl.rc_reorder_ts == 0)
rack->r_ctl.rc_reorder_ts = 1;
}
if (rack->app_limited_needs_set)
rack_need_set_test(tp, rack, rsm, tp->snd_una, __LINE__, RACK_USE_END);
rsm->r_ack_arrival = rack_to_usec_ts(&rack->r_ctl.act_rcv_time);
rsm->r_flags |= RACK_ACKED;
rack_update_pcm_ack(rack, 0, rsm->r_start, rsm->r_end);
if (rsm->r_in_tmap) {
TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 0;
}
rack_log_map_chg(tp, rack, NULL, rsm, NULL, MAP_SACK_M3, end, __LINE__);
}
if (end == rsm->r_end) {
goto out;
}
nrsm = tqhash_next(rack->r_ctl.tqh, rsm);
start = rsm->r_end;
rsm = nrsm;
if (rsm == NULL)
goto out;
goto do_rest_ofb;
}
if ((rsm->r_flags & RACK_ACKED) == 0) {
if ((rsm->r_flags & RACK_TLP) &&
(rsm->r_rtr_cnt > 1)) {
if (rack->rc_last_tlp_acked_set &&
(is_rsm_inside_declared_tlp_block(rack, rsm))) {
rack_log_dsack_event(rack, 10, __LINE__, rsm->r_start, rsm->r_end);
if (SEQ_LT(rsm->r_start, rack->r_ctl.last_tlp_acked_start)) {
rack->r_ctl.last_tlp_acked_start = rsm->r_start;
rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
rack->r_ctl.last_tlp_acked_end);
}
if (SEQ_GT(rsm->r_end, rack->r_ctl.last_tlp_acked_end)) {
rack->r_ctl.last_tlp_acked_end = rsm->r_end;
rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
rack->r_ctl.last_tlp_acked_end);
}
} else {
rack->r_ctl.last_tlp_acked_start = rsm->r_start;
rack->r_ctl.last_tlp_acked_end = rsm->r_end;
rack->rc_last_tlp_past_cumack = 0;
rack->rc_last_tlp_acked_set = 1;
rack_log_dsack_event(rack, 8, __LINE__, rsm->r_start, rsm->r_end);
}
}
prev = tqhash_prev(rack->r_ctl.tqh, rsm);
if (prev &&
(rsm->bindex == prev->bindex) &&
((rsm->r_flags & RACK_STRADDLE) == 0) &&
((prev->r_flags & RACK_STRADDLE) == 0) &&
((prev->r_flags & RACK_WAS_SACKPASS) == 0) &&
((rsm->r_flags & RACK_WAS_SACKPASS) == 0) &&
((rsm->r_flags & RACK_IS_PCM) == 0) &&
((prev->r_flags & RACK_IS_PCM) == 0) &&
(rsm->r_flags & RACK_IN_GP_WIN) &&
(prev->r_flags & RACK_IN_GP_WIN))
can_use_hookery = 1;
else
can_use_hookery = 0;
if (prev && can_use_hookery &&
(prev->r_flags & RACK_ACKED)) {
nrsm = &stack_map;
memcpy(nrsm, rsm, sizeof(struct rack_sendmap));
tqhash_update_end(rack->r_ctl.tqh, prev, end);
rsm->r_start = end;
rsm->r_flags |= RACK_SHUFFLED;
prev->r_flags |= RACK_SHUFFLED;
nrsm->r_end = end;
rsm->r_dupack = 0;
prohibit_marking = rack_check_reorder_ack(tp, rack, nrsm, nrsm->r_end, cts, 0, __LINE__);
if(prev->r_tim_lastsent[(prev->r_rtr_cnt-1)] <
nrsm->r_tim_lastsent[(nrsm->r_rtr_cnt-1)]) {
prev->r_tim_lastsent[(prev->r_rtr_cnt-1)] = nrsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)];
}
if(prev->r_ack_arrival <
rack_to_usec_ts(&rack->r_ctl.act_rcv_time))
prev->r_ack_arrival = rack_to_usec_ts(&rack->r_ctl.act_rcv_time);
rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
rack_setup_offset_for_rsm(rack, prev, rsm);
rack_update_rtt(tp, rack, nrsm, to, cts, SACKED, 0);
if (rack->app_limited_needs_set)
rack_need_set_test(tp, rack, nrsm, tp->snd_una, __LINE__, RACK_USE_END);
changed += (nrsm->r_end - nrsm->r_start);
rack->r_ctl.rc_sacked += (nrsm->r_end - nrsm->r_start);
if (rsm->r_flags & RACK_WAS_LOST) {
int my_chg;
my_chg = (nrsm->r_end - nrsm->r_start);
KASSERT((rack->r_ctl.rc_considered_lost >= my_chg),
("rsm:%p rack:%p rc_considered_lost goes negative", rsm, rack));
if (my_chg <= rack->r_ctl.rc_considered_lost)
rack->r_ctl.rc_considered_lost -= my_chg;
else
rack->r_ctl.rc_considered_lost = 0;
}
if (nrsm->r_flags & RACK_SACK_PASSED) {
rack->r_ctl.rc_reorder_ts = cts;
if (rack->r_ctl.rc_reorder_ts == 0)
rack->r_ctl.rc_reorder_ts = 1;
}
rack_log_map_chg(tp, rack, prev, &stack_map, rsm, MAP_SACK_M4, end, __LINE__);
rsm = prev;
} else {
nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT);
if (nrsm == NULL) {
goto out;
}
if ((rsm->r_flags & RACK_TLP) &&
(rsm->r_rtr_cnt > 1)) {
if (rack->rc_last_tlp_acked_set &&
(is_rsm_inside_declared_tlp_block(rack, rsm))) {
rack_log_dsack_event(rack, 10, __LINE__, rsm->r_start, rsm->r_end);
if (SEQ_LT(rsm->r_start, rack->r_ctl.last_tlp_acked_start)) {
rack->r_ctl.last_tlp_acked_start = rsm->r_start;
rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
rack->r_ctl.last_tlp_acked_end);
}
if (SEQ_GT(rsm->r_end, rack->r_ctl.last_tlp_acked_end)) {
rack->r_ctl.last_tlp_acked_end = rsm->r_end;
rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
rack->r_ctl.last_tlp_acked_end);
}
} else {
rack->r_ctl.last_tlp_acked_start = rsm->r_start;
rack->r_ctl.last_tlp_acked_end = rsm->r_end;
rack->rc_last_tlp_acked_set = 1;
rack->rc_last_tlp_past_cumack = 0;
rack_log_dsack_event(rack, 8, __LINE__, rsm->r_start, rsm->r_end);
}
}
rack_clone_rsm(rack, nrsm, rsm, end);
rsm->r_flags &= (~RACK_HAS_FIN);
rsm->r_just_ret = 0;
#ifndef INVARIANTS
(void)tqhash_insert(rack->r_ctl.tqh, nrsm);
#else
if ((insret = tqhash_insert(rack->r_ctl.tqh, nrsm)) != 0) {
panic("Insert in tailq_hash of %p fails ret:% rack:%p rsm:%p",
nrsm, insret, rack, rsm);
}
#endif
if (rsm->r_in_tmap) {
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
nrsm->r_in_tmap = 1;
}
nrsm->r_dupack = 0;
prohibit_marking = rack_check_reorder_ack(tp, rack, nrsm, nrsm->r_end, cts, 0, __LINE__);
rack_log_retran_reason(rack, nrsm, __LINE__, 0, 2);
rack_update_rtt(tp, rack, rsm, to, cts, SACKED, 0);
changed += (rsm->r_end - rsm->r_start);
if (rsm->r_flags & RACK_WAS_LOST) {
rack_mark_nolonger_lost(rack, rsm);
}
rack->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start);
if (rsm->r_in_tmap && (prohibit_marking == 0))
rack_log_sack_passed(tp, rack, rsm, cts, __LINE__);
if (rsm->r_flags & RACK_SACK_PASSED) {
rsm->r_flags &= ~RACK_SACK_PASSED;
rack->r_ctl.rc_reorder_ts = cts;
if (rack->r_ctl.rc_reorder_ts == 0)
rack->r_ctl.rc_reorder_ts = 1;
}
if (rack->app_limited_needs_set)
rack_need_set_test(tp, rack, rsm, tp->snd_una, __LINE__, RACK_USE_END);
rsm->r_ack_arrival = rack_to_usec_ts(&rack->r_ctl.act_rcv_time);
rsm->r_flags |= RACK_ACKED;
rack_update_pcm_ack(rack, 0, rsm->r_start, rsm->r_end);
rack_log_map_chg(tp, rack, NULL, rsm, nrsm, MAP_SACK_M5, end, __LINE__);
if (rsm->r_in_tmap) {
TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 0;
}
}
}
out:
if (rsm &&
((rsm->r_flags & RACK_TLP) == 0) &&
(rsm->r_flags & RACK_ACKED)) {
next = tqhash_next(rack->r_ctl.tqh, rsm);
while (next) {
if (next->r_flags & RACK_TLP)
break;
if ((next->r_flags & RACK_IN_GP_WIN) &&
((rsm->r_flags & RACK_IN_GP_WIN) == 0)) {
break;
}
if ((rsm->r_flags & RACK_WAS_SACKPASS) ||
(next->r_flags & RACK_WAS_SACKPASS))
break;
if ((rsm->r_flags & RACK_IN_GP_WIN) &&
((next->r_flags & RACK_IN_GP_WIN) == 0)) {
break;
}
if (rsm->bindex != next->bindex)
break;
if (rsm->r_flags & RACK_STRADDLE)
break;
if (rsm->r_flags & RACK_IS_PCM)
break;
if (next->r_flags & RACK_STRADDLE)
break;
if (next->r_flags & RACK_IS_PCM)
break;
if (next->r_flags & RACK_ACKED) {
rsm = rack_merge_rsm(rack, rsm, next);
next = tqhash_next(rack->r_ctl.tqh, rsm);
} else
break;
}
prev = tqhash_prev(rack->r_ctl.tqh, rsm);
while (prev) {
if (prev->r_flags & RACK_TLP)
break;
if ((prev->r_flags & RACK_IN_GP_WIN) &&
((rsm->r_flags & RACK_IN_GP_WIN) == 0)) {
break;
}
if ((rsm->r_flags & RACK_WAS_SACKPASS) ||
(prev->r_flags & RACK_WAS_SACKPASS))
break;
if ((rsm->r_flags & RACK_IN_GP_WIN) &&
((prev->r_flags & RACK_IN_GP_WIN) == 0)) {
break;
}
if (rsm->bindex != prev->bindex)
break;
if (rsm->r_flags & RACK_STRADDLE)
break;
if (rsm->r_flags & RACK_IS_PCM)
break;
if (prev->r_flags & RACK_STRADDLE)
break;
if (prev->r_flags & RACK_IS_PCM)
break;
if (prev->r_flags & RACK_ACKED) {
rsm = rack_merge_rsm(rack, prev, rsm);
prev = tqhash_prev(rack->r_ctl.tqh, rsm);
} else
break;
}
}
if (used_ref == 0) {
counter_u64_add(rack_sack_proc_all, 1);
} else {
counter_u64_add(rack_sack_proc_short, 1);
}
nrsm = tqhash_find(rack->r_ctl.tqh, end);
*prsm = rack->r_ctl.rc_sacklast = nrsm;
return (changed);
}
static void inline
rack_peer_reneges(struct tcp_rack *rack, struct rack_sendmap *rsm, tcp_seq th_ack)
{
struct rack_sendmap *tmap;
tmap = NULL;
while (rsm && (rsm->r_flags & RACK_ACKED)) {
rack->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start);
#ifdef INVARIANTS
if (rsm->r_in_tmap) {
panic("rack:%p rsm:%p flags:0x%x in tmap?",
rack, rsm, rsm->r_flags);
}
#endif
rsm->r_flags &= ~(RACK_ACKED|RACK_SACK_PASSED|RACK_WAS_SACKPASS);
if (tmap == NULL) {
TAILQ_INSERT_HEAD(&rack->r_ctl.rc_tmap, rsm, r_tnext);
tmap = rsm;
} else {
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, tmap, rsm, r_tnext);
tmap = rsm;
}
tmap->r_in_tmap = 1;
rsm = tqhash_next(rack->r_ctl.tqh, rsm);
}
sack_filter_clear(&rack->r_ctl.rack_sf, th_ack);
}
static void inline
rack_rsm_sender_update(struct tcp_rack *rack, struct tcpcb *tp, struct rack_sendmap *rsm, uint8_t from)
{
uint64_t ts;
if ((tp->t_flags & TF_GPUTINPROG) == 0)
return;
if (SEQ_GT(rsm->r_end, tp->gput_ack)) {
tp->gput_ack = rsm->r_end;
}
if (rack->app_limited_needs_set)
return;
if ((ts = rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)]) <=
rack->r_ctl.rc_gp_cumack_ts)
return;
if (rack_in_gp_window(tp, rsm)) {
rack->r_ctl.rc_gp_cumack_ts = ts;
rack_log_gpset(rack, tp->gput_ack, (uint32_t)ts, rsm->r_end,
__LINE__, from, rsm);
}
}
static void
rack_process_to_cumack(struct tcpcb *tp, struct tcp_rack *rack, register uint32_t th_ack, uint32_t cts, struct tcpopt *to, uint64_t acktime)
{
struct rack_sendmap *rsm;
if (sack_filter_blks_used(&rack->r_ctl.rack_sf)) {
sack_filter_blks(tp, &rack->r_ctl.rack_sf, NULL, 0, th_ack);
}
if (SEQ_GT(th_ack, tp->snd_una)) {
rack->r_ctl.cleared_app_ack = 0;
}
rack->r_wanted_output = 1;
if (SEQ_GT(th_ack, tp->snd_una))
rack->r_ctl.last_cumack_advance = acktime;
if ((rack->rc_last_tlp_acked_set == 1)&&
(rack->rc_last_tlp_past_cumack == 1) &&
(SEQ_GT(rack->r_ctl.last_tlp_acked_start, th_ack))) {
rack_log_dsack_event(rack, 9, __LINE__,
rack->r_ctl.last_tlp_acked_start,
rack->r_ctl.last_tlp_acked_end);
rack->rc_last_tlp_acked_set = 0;
rack->rc_last_tlp_past_cumack = 0;
} else if ((rack->rc_last_tlp_acked_set == 1) &&
(rack->rc_last_tlp_past_cumack == 0) &&
(SEQ_GEQ(th_ack, rack->r_ctl.last_tlp_acked_end))) {
rack->rc_last_tlp_past_cumack = 1;
}
if ((rack->rc_last_sent_tlp_seq_valid == 1) &&
(rack->rc_last_sent_tlp_past_cumack == 1) &&
(SEQ_GT(rack->r_ctl.last_sent_tlp_seq, th_ack))) {
rack_log_dsack_event(rack, 9, __LINE__,
rack->r_ctl.last_sent_tlp_seq,
(rack->r_ctl.last_sent_tlp_seq +
rack->r_ctl.last_sent_tlp_len));
rack->rc_last_sent_tlp_seq_valid = 0;
rack->rc_last_sent_tlp_past_cumack = 0;
} else if ((rack->rc_last_sent_tlp_seq_valid == 1) &&
(rack->rc_last_sent_tlp_past_cumack == 0) &&
(SEQ_GEQ(th_ack, rack->r_ctl.last_sent_tlp_seq))) {
rack->rc_last_sent_tlp_past_cumack = 1;
}
more:
rsm = tqhash_min(rack->r_ctl.tqh);
if (rsm == NULL) {
if ((th_ack - 1) == tp->iss) {
return;
}
if (tp->t_flags & TF_SENTFIN) {
return;
}
#ifdef INVARIANTS
panic("No rack map tp:%p for state:%d ack:%u rack:%p snd_una:%u snd_max:%u\n",
tp,
tp->t_state, th_ack, rack,
tp->snd_una, tp->snd_max);
#endif
return;
}
if (SEQ_LT(th_ack, rsm->r_start)) {
#ifdef INVARIANTS
printf("Rack map starts at r_start:%u for th_ack:%u huh? ts:%d rs:%d\n",
rsm->r_start,
th_ack, tp->t_state, rack->r_state);
#endif
return;
}
rack_update_rtt(tp, rack, rsm, to, cts, CUM_ACKED, th_ack);
if ((rsm->r_flags & RACK_TLP) &&
(rsm->r_rtr_cnt > 1)) {
if (rack->rc_last_tlp_acked_set &&
(is_rsm_inside_declared_tlp_block(rack, rsm))) {
rack_log_dsack_event(rack, 10, __LINE__, rsm->r_start, rsm->r_end);
if (SEQ_LT(rsm->r_start, rack->r_ctl.last_tlp_acked_start)) {
rack->r_ctl.last_tlp_acked_start = rsm->r_start;
rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
rack->r_ctl.last_tlp_acked_end);
}
if (SEQ_GT(rsm->r_end, rack->r_ctl.last_tlp_acked_end)) {
rack->r_ctl.last_tlp_acked_end = rsm->r_end;
rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
rack->r_ctl.last_tlp_acked_end);
}
} else {
rack->rc_last_tlp_past_cumack = 1;
rack->r_ctl.last_tlp_acked_start = rsm->r_start;
rack->r_ctl.last_tlp_acked_end = rsm->r_end;
rack->rc_last_tlp_acked_set = 1;
rack_log_dsack_event(rack, 8, __LINE__, rsm->r_start, rsm->r_end);
}
}
rack->r_ctl.last_tmit_time_acked = rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)];
if (SEQ_GEQ(th_ack, rsm->r_end)) {
uint32_t left;
uint8_t newly_acked;
if (rsm->r_flags & RACK_WAS_LOST) {
rack_mark_nolonger_lost(rack, rsm);
}
rack_log_map_chg(tp, rack, NULL, rsm, NULL, MAP_FREE, rsm->r_end, __LINE__);
rack->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes;
rsm->r_rtr_bytes = 0;
rack_rsm_sender_update(rack, tp, rsm, 4);
tqhash_remove(rack->r_ctl.tqh, rsm, REMOVE_TYPE_CUMACK);
if (rsm->r_in_tmap) {
TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 0;
}
newly_acked = 1;
if (rsm->r_flags & RACK_ACKED) {
rack->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start);
newly_acked = 0;
} else if (rsm->r_flags & RACK_SACK_PASSED) {
rsm->r_flags &= ~RACK_SACK_PASSED;
rsm->r_ack_arrival = rack_to_usec_ts(&rack->r_ctl.act_rcv_time);
rsm->r_flags |= RACK_ACKED;
rack->r_ctl.rc_reorder_ts = cts;
if (rack->r_ctl.rc_reorder_ts == 0)
rack->r_ctl.rc_reorder_ts = 1;
if (rack->r_ent_rec_ns) {
rack->r_might_revert = 1;
}
rack_update_pcm_ack(rack, 1, rsm->r_start, rsm->r_end);
} else {
(void)rack_check_reorder_ack(tp, rack, rsm, rsm->r_end, cts, 1, __LINE__);
rack_update_pcm_ack(rack, 1, rsm->r_start, rsm->r_end);
}
if ((rsm->r_flags & RACK_TO_REXT) &&
(tp->t_flags & TF_RCVD_TSTMP) &&
(to->to_flags & TOF_TS) &&
(to->to_tsecr != 0) &&
(tp->t_flags & TF_PREVVALID)) {
tp->t_flags &= ~TF_PREVVALID;
if (to->to_tsecr == rack_ts_to_msec(rsm->r_tim_lastsent[0])) {
rack_cong_signal(tp, CC_RTO_ERR, th_ack, __LINE__);
}
}
left = th_ack - rsm->r_end;
if (rack->app_limited_needs_set && newly_acked)
rack_need_set_test(tp, rack, rsm, th_ack, __LINE__, RACK_USE_END_OR_THACK);
rack_free(rack, rsm);
if (left) {
goto more;
}
rsm = tqhash_min(rack->r_ctl.tqh);
if (rsm && (rsm->r_flags & RACK_ACKED) && (th_ack == rsm->r_start)) {
rack_peer_reneges(rack, rsm, th_ack);
}
return;
}
if (rsm->r_flags & RACK_ACKED) {
rack->r_ctl.rc_sacked -= (th_ack - rsm->r_start);
} else {
rack_update_pcm_ack(rack, 1, rsm->r_start, th_ack);
}
if (rsm->r_flags & RACK_WAS_LOST) {
rack_mark_nolonger_lost(rack, rsm);
}
rsm->r_dupack = 0;
rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
if (rsm->r_rtr_bytes) {
int ack_am;
ack_am = (th_ack - rsm->r_start);
if (ack_am >= rsm->r_rtr_bytes) {
rack->r_ctl.rc_holes_rxt -= ack_am;
rsm->r_rtr_bytes -= ack_am;
}
}
rack_log_map_chg(tp, rack, NULL, rsm, NULL, MAP_TRIM_HEAD, th_ack, __LINE__);
if (rsm->m &&
((rsm->orig_m_len != rsm->m->m_len) ||
(M_TRAILINGROOM(rsm->m) != rsm->orig_t_space))) {
rack_adjust_orig_mlen(rsm);
}
rsm->soff += (th_ack - rsm->r_start);
rack_rsm_sender_update(rack, tp, rsm, 5);
if (rsm->r_flags & RACK_WAS_SACKPASS) {
rack_check_reorder_ack(tp, rack, rsm, th_ack, cts, 1, __LINE__);
}
tqhash_trim(rack->r_ctl.tqh, th_ack);
{
struct mbuf *m;
uint32_t soff;
m = rsm->m;
soff = rsm->soff;
if (m) {
while (soff >= m->m_len) {
soff -= m->m_len;
KASSERT((m->m_next != NULL),
(" rsm:%p off:%u soff:%u m:%p",
rsm, rsm->soff, soff, m));
m = m->m_next;
if (m == NULL) {
m = sbsndmbuf(&rack->rc_inp->inp_socket->so_snd,
(rsm->r_start - tp->snd_una),
&soff);
break;
}
}
rsm->m = m;
rsm->soff = soff;
rsm->orig_m_len = rsm->m->m_len;
rsm->orig_t_space = M_TRAILINGROOM(rsm->m);
}
}
if (rack->app_limited_needs_set &&
SEQ_GEQ(th_ack, tp->gput_seq))
rack_need_set_test(tp, rack, rsm, tp->snd_una, __LINE__, RACK_USE_BEG);
}
static void
rack_handle_might_revert(struct tcpcb *tp, struct tcp_rack *rack)
{
struct rack_sendmap *rsm;
int sack_pass_fnd = 0;
if (rack->r_might_revert) {
TAILQ_FOREACH(rsm, &rack->r_ctl.rc_tmap, r_tnext) {
if (rsm->r_flags & RACK_SACK_PASSED) {
sack_pass_fnd = 1;
break;
}
}
if (sack_pass_fnd == 0) {
int orig_cwnd;
rack->r_ent_rec_ns = 0;
orig_cwnd = tp->snd_cwnd;
tp->snd_ssthresh = rack->r_ctl.rc_ssthresh_at_erec;
tp->snd_recover = tp->snd_una;
rack_log_to_prr(rack, 14, orig_cwnd, __LINE__);
if (IN_RECOVERY(tp->t_flags)) {
rack_exit_recovery(tp, rack, 3);
if ((rack->rto_from_rec == 1) && (rack_ssthresh_rest_rto_rec != 0) ){
rack->rto_from_rec = 0;
if (rack->r_ctl.rto_ssthresh > tp->snd_ssthresh)
tp->snd_ssthresh = rack->r_ctl.rto_ssthresh;
}
}
}
rack->r_might_revert = 0;
}
}
static int
rack_note_dsack(struct tcp_rack *rack, tcp_seq start, tcp_seq end)
{
uint32_t am, l_end;
int was_tlp = 0;
if (SEQ_GT(end, start))
am = end - start;
else
am = 0;
if ((rack->rc_last_tlp_acked_set ) &&
(SEQ_GEQ(start, rack->r_ctl.last_tlp_acked_start)) &&
(SEQ_LEQ(end, rack->r_ctl.last_tlp_acked_end))) {
rack_log_dsack_event(rack, 7, __LINE__, start, end);
was_tlp = 1;
goto skip_dsack_round;
}
if (rack->rc_last_sent_tlp_seq_valid) {
l_end = rack->r_ctl.last_sent_tlp_seq + rack->r_ctl.last_sent_tlp_len;
if (SEQ_GEQ(start, rack->r_ctl.last_sent_tlp_seq) &&
(SEQ_LEQ(end, l_end))) {
rack_log_dsack_event(rack, 7, __LINE__, start, end);
was_tlp = 1;
goto skip_dsack_round;
}
}
if (rack->rc_dsack_round_seen == 0) {
rack->rc_dsack_round_seen = 1;
rack->r_ctl.dsack_round_end = rack->rc_tp->snd_max;
rack->r_ctl.num_dsack++;
rack->r_ctl.dsack_persist = 16;
rack_log_dsack_event(rack, 2, __LINE__, 0, 0);
}
skip_dsack_round:
rack->r_ctl.dsack_byte_cnt += am;
if (!IN_FASTRECOVERY(rack->rc_tp->t_flags) &&
rack->r_ctl.retran_during_recovery &&
(rack->r_ctl.dsack_byte_cnt >= rack->r_ctl.retran_during_recovery)) {
rack->r_might_revert = 1;
rack_handle_might_revert(rack->rc_tp, rack);
rack->r_might_revert = 0;
rack->r_ctl.retran_during_recovery = 0;
rack->r_ctl.dsack_byte_cnt = 0;
}
return (was_tlp);
}
static uint32_t
do_rack_compute_pipe(struct tcpcb *tp, struct tcp_rack *rack, uint32_t snd_una)
{
return (((tp->snd_max - snd_una) -
(rack->r_ctl.rc_sacked + rack->r_ctl.rc_considered_lost)) + rack->r_ctl.rc_holes_rxt);
}
static int32_t
rack_compute_pipe(struct tcpcb *tp)
{
return ((int32_t)do_rack_compute_pipe(tp,
(struct tcp_rack *)tp->t_fb_ptr,
tp->snd_una));
}
static void
rack_update_prr(struct tcpcb *tp, struct tcp_rack *rack, uint32_t changed, tcp_seq th_ack)
{
uint32_t pipe, snd_una;
rack->r_ctl.rc_prr_delivered += changed;
if (sbavail(&rack->rc_inp->inp_socket->so_snd) <= (tp->snd_max - tp->snd_una)) {
rack->r_ctl.rc_prr_sndcnt = 0;
return;
}
if (SEQ_GT(tp->snd_una, th_ack)) {
snd_una = tp->snd_una;
} else {
snd_una = th_ack;
}
pipe = do_rack_compute_pipe(tp, rack, snd_una);
if (pipe > tp->snd_ssthresh) {
long sndcnt;
sndcnt = rack->r_ctl.rc_prr_delivered * tp->snd_ssthresh;
if (rack->r_ctl.rc_prr_recovery_fs > 0)
sndcnt /= (long)rack->r_ctl.rc_prr_recovery_fs;
else {
rack->r_ctl.rc_prr_sndcnt = 0;
rack_log_to_prr(rack, 9, 0, __LINE__);
sndcnt = 0;
}
sndcnt++;
if (sndcnt > (long)rack->r_ctl.rc_prr_out)
sndcnt -= rack->r_ctl.rc_prr_out;
else
sndcnt = 0;
rack->r_ctl.rc_prr_sndcnt = sndcnt;
rack_log_to_prr(rack, 10, 0, __LINE__);
} else {
uint32_t limit;
if (rack->r_ctl.rc_prr_delivered > rack->r_ctl.rc_prr_out)
limit = (rack->r_ctl.rc_prr_delivered - rack->r_ctl.rc_prr_out);
else
limit = 0;
if (changed > limit)
limit = changed;
limit += ctf_fixed_maxseg(tp);
if (tp->snd_ssthresh > pipe) {
rack->r_ctl.rc_prr_sndcnt = min((tp->snd_ssthresh - pipe), limit);
rack_log_to_prr(rack, 11, 0, __LINE__);
} else {
rack->r_ctl.rc_prr_sndcnt = min(0, limit);
rack_log_to_prr(rack, 12, 0, __LINE__);
}
}
}
static void
rack_log_ack(struct tcpcb *tp, struct tcpopt *to, struct tcphdr *th, int entered_recovery, int dup_ack_struck,
int *dsack_seen, int *sacks_seen)
{
uint32_t changed;
struct tcp_rack *rack;
struct rack_sendmap *rsm;
struct sackblk sack, sack_blocks[TCP_MAX_SACK + 1];
register uint32_t th_ack;
int32_t i, j, k, num_sack_blks = 0;
uint32_t cts, acked, ack_point;
int loop_start = 0;
uint32_t tsused;
uint32_t segsiz;
INP_WLOCK_ASSERT(tptoinpcb(tp));
if (tcp_get_flags(th) & TH_RST) {
return;
}
rack = (struct tcp_rack *)tp->t_fb_ptr;
cts = tcp_get_usecs(NULL);
rsm = tqhash_min(rack->r_ctl.tqh);
changed = 0;
th_ack = th->th_ack;
segsiz = ctf_fixed_maxseg(rack->rc_tp);
if (SEQ_GT(th_ack, tp->snd_una)) {
rack_log_progress_event(rack, tp, ticks, PROGRESS_UPDATE, __LINE__);
tp->t_acktime = ticks;
}
if (rsm && SEQ_GT(th_ack, rsm->r_start))
changed = th_ack - rsm->r_start;
if (changed) {
rack_process_to_cumack(tp, rack, th_ack, cts, to,
tcp_tv_to_lusec(&rack->r_ctl.act_rcv_time));
}
if ((to->to_flags & TOF_SACK) == 0) {
rack_handle_might_revert(tp, rack);
if (dup_ack_struck && (changed == 0)) {
changed += ctf_fixed_maxseg(rack->rc_tp);
}
goto out;
}
if (SEQ_GT(th_ack, tp->snd_una))
ack_point = th_ack;
else
ack_point = tp->snd_una;
for (i = 0; i < to->to_nsacks; i++) {
bcopy((to->to_sacks + i * TCPOLEN_SACK),
&sack, sizeof(sack));
sack.start = ntohl(sack.start);
sack.end = ntohl(sack.end);
if (SEQ_GT(sack.end, sack.start) &&
SEQ_GT(sack.start, ack_point) &&
SEQ_LT(sack.start, tp->snd_max) &&
SEQ_GT(sack.end, ack_point) &&
SEQ_LEQ(sack.end, tp->snd_max)) {
sack_blocks[num_sack_blks] = sack;
num_sack_blks++;
} else if (SEQ_LEQ(sack.start, th_ack) &&
SEQ_LEQ(sack.end, th_ack)) {
int was_tlp;
if (dsack_seen != NULL)
*dsack_seen = 1;
was_tlp = rack_note_dsack(rack, sack.start, sack.end);
tcp_record_dsack(tp, sack.start, sack.end, was_tlp);
}
}
if (rack->rc_dsack_round_seen) {
if (SEQ_GEQ(th_ack, rack->r_ctl.dsack_round_end)) {
rack->rc_dsack_round_seen = 0;
rack_log_dsack_event(rack, 3, __LINE__, 0, 0);
}
}
num_sack_blks = sack_filter_blks(tp, &rack->r_ctl.rack_sf, sack_blocks,
num_sack_blks, th->th_ack);
ctf_log_sack_filter(rack->rc_tp, num_sack_blks, sack_blocks);
if (sacks_seen != NULL)
*sacks_seen = num_sack_blks;
if (num_sack_blks == 0) {
goto out;
}
if (num_sack_blks < 2) {
goto do_sack_work;
}
for (i = 0; i < num_sack_blks; i++) {
for (j = i + 1; j < num_sack_blks; j++) {
if (SEQ_GT(sack_blocks[i].end, sack_blocks[j].end)) {
sack = sack_blocks[i];
sack_blocks[i] = sack_blocks[j];
sack_blocks[j] = sack;
}
}
}
again:
if (num_sack_blks == 0)
goto out;
if (num_sack_blks > 1) {
for (i = 0; i < num_sack_blks; i++) {
for (j = i + 1; j < num_sack_blks; j++) {
if (sack_blocks[i].end == sack_blocks[j].end) {
if (SEQ_LT(sack_blocks[j].start, sack_blocks[i].start)) {
sack_blocks[i].start = sack_blocks[j].start;
}
for (k = (j + 1); k < num_sack_blks; k++) {
sack_blocks[j].start = sack_blocks[k].start;
sack_blocks[j].end = sack_blocks[k].end;
j++;
}
num_sack_blks--;
goto again;
}
}
}
}
do_sack_work:
rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
if (rsm &&
SEQ_GT(sack_blocks[0].end, rsm->r_start) &&
SEQ_LT(sack_blocks[0].start, rsm->r_end)) {
acked = rack_proc_sack_blk(tp, rack, &sack_blocks[0], to, &rsm, cts, segsiz);
if (acked) {
rack->r_wanted_output = 1;
changed += acked;
}
if (num_sack_blks == 1) {
goto out;
} else {
loop_start = 1;
}
}
rsm = rack->r_ctl.rc_sacklast;
for (i = loop_start; i < num_sack_blks; i++) {
acked = rack_proc_sack_blk(tp, rack, &sack_blocks[i], to, &rsm, cts, segsiz);
if (acked) {
rack->r_wanted_output = 1;
changed += acked;
}
}
out:
if (changed) {
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
}
tsused = tcp_get_usecs(NULL);
rsm = tcp_rack_output(tp, rack, tsused);
if ((!IN_FASTRECOVERY(tp->t_flags)) &&
rsm &&
((rsm->r_flags & RACK_MUST_RXT) == 0)) {
entered_recovery = 1;
rack_cong_signal(tp, CC_NDUPACK, th_ack, __LINE__);
if (rack->rack_no_prr == 0) {
rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
rack_log_to_prr(rack, 8, 0, __LINE__);
}
rack->r_timer_override = 1;
rack->r_early = 0;
rack->r_ctl.rc_agg_early = 0;
} else if (IN_FASTRECOVERY(tp->t_flags) &&
rsm &&
(rack->r_rr_config == 3)) {
rack->r_timer_override = 1;
rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
rack->r_ctl.rc_resend = rsm;
}
if (IN_FASTRECOVERY(tp->t_flags) &&
(rack->rack_no_prr == 0) &&
(entered_recovery == 0)) {
rack_update_prr(tp, rack, changed, th_ack);
if ((rsm && (rack->r_ctl.rc_prr_sndcnt >= ctf_fixed_maxseg(tp)) &&
((tcp_in_hpts(rack->rc_tp) == 0) &&
((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0)))) {
rack->r_early = 0;
rack->r_ctl.rc_agg_early = 0;
rack->r_timer_override = 1;
}
}
}
static void
rack_strike_dupack(struct tcp_rack *rack, tcp_seq th_ack)
{
struct rack_sendmap *rsm;
rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
while (rsm) {
if ((rsm->r_dupack >= DUP_ACK_THRESHOLD) ||
(rsm->r_flags & RACK_MUST_RXT)) {
rsm = TAILQ_NEXT(rsm, r_tnext);
continue;
}
break;
}
if (rsm && (rsm->r_dupack < 0xff)) {
rsm->r_dupack++;
if (rsm->r_dupack >= DUP_ACK_THRESHOLD) {
struct timeval tv;
uint32_t cts;
cts = tcp_get_usecs(&tv);
rack->r_ctl.rc_resend = tcp_rack_output(rack->rc_tp, rack, cts);
if (rack->r_ctl.rc_resend != NULL) {
if (!IN_FASTRECOVERY(rack->rc_tp->t_flags)) {
rack_cong_signal(rack->rc_tp, CC_NDUPACK,
th_ack, __LINE__);
}
rack->r_wanted_output = 1;
rack->r_timer_override = 1;
rack_log_retran_reason(rack, rsm, __LINE__, 1, 3);
}
} else {
rack_log_retran_reason(rack, rsm, __LINE__, 0, 3);
}
}
}
static void
rack_check_bottom_drag(struct tcpcb *tp,
struct tcp_rack *rack,
struct socket *so)
{
uint32_t segsiz, minseg;
segsiz = ctf_fixed_maxseg(tp);
minseg = segsiz;
if (tp->snd_max == tp->snd_una) {
uint64_t lt_bw;
tcp_trace_point(rack->rc_tp, TCP_TP_PACED_BOTTOM);
lt_bw = rack_get_lt_bw(rack);
rack->rc_dragged_bottom = 1;
rack_validate_multipliers_at_or_above100(rack);
if ((rack->r_ctl.rack_rs.rs_flags & RACK_RTT_VALID) &&
(rack->dis_lt_bw == 0) &&
(rack->use_lesser_lt_bw == 0) &&
(lt_bw > 0)) {
if (rack->rc_gp_filled == 0) {
if (lt_bw > ONE_POINT_TWO_MEG) {
lt_bw = ONE_POINT_TWO_MEG;
}
rack->r_ctl.rc_rtt_diff = 0;
rack->r_ctl.gp_bw = lt_bw;
rack->rc_gp_filled = 1;
if (rack->r_ctl.num_measurements < RACK_REQ_AVG)
rack->r_ctl.num_measurements = RACK_REQ_AVG;
rack_set_pace_segments(rack->rc_tp, rack, __LINE__, NULL);
} else if (lt_bw > rack->r_ctl.gp_bw) {
rack->r_ctl.rc_rtt_diff = 0;
if (rack->r_ctl.num_measurements < RACK_REQ_AVG)
rack->r_ctl.num_measurements = RACK_REQ_AVG;
rack->r_ctl.gp_bw = lt_bw;
rack_set_pace_segments(rack->rc_tp, rack, __LINE__, NULL);
} else
rack_increase_bw_mul(rack, -1, 0, 0, 1);
if ((rack->gp_ready == 0) &&
(rack->r_ctl.num_measurements >= rack->r_ctl.req_measurements)) {
rack->gp_ready = 1;
if (rack->dgp_on ||
rack->rack_hibeta)
rack_set_cc_pacing(rack);
if (rack->defer_options)
rack_apply_deferred_options(rack);
}
} else {
rack_increase_bw_mul(rack, -1, 0, 0, 1);
}
} else if ((IN_FASTRECOVERY(tp->t_flags) == 0) &&
(sbavail(&so->so_snd) > max((segsiz * (4 + rack_req_segs)),
minseg)) &&
(rack->r_ctl.cwnd_to_use > max((segsiz * (rack_req_segs + 2)), minseg)) &&
(tp->snd_wnd > max((segsiz * (rack_req_segs + 2)), minseg)) &&
(ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) <=
(segsiz * rack_req_segs))) {
rack_validate_multipliers_at_or_above100(rack);
rack->rc_dragged_bottom = 1;
rack_increase_bw_mul(rack, -1, 0, 0, 1);
}
}
#ifdef TCP_REQUEST_TRK
static void
rack_log_hybrid(struct tcp_rack *rack, uint32_t seq,
struct tcp_sendfile_track *cur, uint8_t mod, int line, int err)
{
int do_log;
do_log = tcp_bblogging_on(rack->rc_tp);
if (do_log == 0) {
if ((do_log = tcp_bblogging_point_on(rack->rc_tp, TCP_BBPOINT_REQ_LEVEL_LOGGING) )== 0)
return;
if ((mod != HYBRID_LOG_RULES_APP) &&
(mod != HYBRID_LOG_RULES_SET) &&
(mod != HYBRID_LOG_REQ_COMP))
return;
}
if (do_log) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.flex1 = seq;
log.u_bbr.cwnd_gain = line;
if (cur != NULL) {
uint64_t off;
log.u_bbr.flex2 = cur->start_seq;
log.u_bbr.flex3 = cur->end_seq;
log.u_bbr.flex4 = (uint32_t)((cur->localtime >> 32) & 0x00000000ffffffff);
log.u_bbr.flex5 = (uint32_t)(cur->localtime & 0x00000000ffffffff);
log.u_bbr.flex6 = cur->flags;
log.u_bbr.pkts_out = cur->hybrid_flags;
log.u_bbr.rttProp = cur->timestamp;
log.u_bbr.cur_del_rate = cur->cspr;
log.u_bbr.bw_inuse = cur->start;
log.u_bbr.applimited = (uint32_t)(cur->end & 0x00000000ffffffff);
log.u_bbr.delivered = (uint32_t)((cur->end >> 32) & 0x00000000ffffffff) ;
log.u_bbr.epoch = (uint32_t)(cur->deadline & 0x00000000ffffffff);
log.u_bbr.lt_epoch = (uint32_t)((cur->deadline >> 32) & 0x00000000ffffffff) ;
log.u_bbr.inhpts = 1;
#ifdef TCP_REQUEST_TRK
off = (uint64_t)(cur) - (uint64_t)(&rack->rc_tp->t_tcpreq_info[0]);
log.u_bbr.use_lt_bw = (uint8_t)(off / sizeof(struct tcp_sendfile_track));
#endif
} else {
log.u_bbr.flex2 = err;
}
log.u_bbr.flex7 = rack->rc_catch_up;
log.u_bbr.flex7 <<= 1;
log.u_bbr.flex7 |= rack->rc_hybrid_mode;
log.u_bbr.flex7 <<= 1;
log.u_bbr.flex7 |= rack->dgp_on;
log.u_bbr.bbr_state = rack->rc_always_pace;
log.u_bbr.bbr_state <<= 1;
log.u_bbr.bbr_state |= rack->dgp_on;
log.u_bbr.bbr_state <<= 1;
log.u_bbr.bbr_state |= rack->rc_hybrid_mode;
log.u_bbr.bbr_state <<= 1;
log.u_bbr.bbr_state |= rack->use_fixed_rate;
log.u_bbr.flex8 = mod;
log.u_bbr.delRate = rack->r_ctl.bw_rate_cap;
log.u_bbr.bbr_substate = rack->r_ctl.client_suggested_maxseg;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkt_epoch = rack->rc_tp->tcp_hybrid_start;
log.u_bbr.lost = rack->rc_tp->tcp_hybrid_error;
log.u_bbr.pacing_gain = (uint16_t)rack->rc_tp->tcp_hybrid_stop;
tcp_log_event(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
TCP_HYBRID_PACING_LOG, 0,
0, &log, false, NULL, __func__, __LINE__, &tv);
}
}
#endif
#ifdef TCP_REQUEST_TRK
static void
rack_set_dgp_hybrid_mode(struct tcp_rack *rack, tcp_seq seq, uint32_t len, uint64_t cts)
{
struct tcp_sendfile_track *rc_cur, *orig_ent;
struct tcpcb *tp;
int err = 0;
orig_ent = rack->r_ctl.rc_last_sft;
rc_cur = tcp_req_find_req_for_seq(rack->rc_tp, seq);
if (rc_cur == NULL) {
if (rack->rc_hybrid_mode)
rack_log_hybrid(rack, seq, NULL, HYBRID_LOG_NO_RANGE, __LINE__, err);
rc_cur = tcp_req_find_req_for_seq(rack->rc_tp, (seq + len - 1));
} else {
err = 12345;
}
if(rc_cur == NULL) {
if (rack->rc_hybrid_mode) {
rack->r_ctl.client_suggested_maxseg = 0;
rack->rc_catch_up = 0;
if (rack->cspr_is_fcc == 0)
rack->r_ctl.bw_rate_cap = 0;
else
rack->r_ctl.fillcw_cap = rack_fillcw_bw_cap;
}
if (rack->rc_hybrid_mode) {
rack_log_hybrid(rack, (seq + len - 1), NULL, HYBRID_LOG_NO_RANGE, __LINE__, err);
}
if (rack->r_ctl.rc_last_sft) {
rack->r_ctl.rc_last_sft = NULL;
}
return;
}
if ((rc_cur->hybrid_flags & TCP_HYBRID_PACING_WASSET) == 0) {
if (rack->rc_hybrid_mode) {
rack->r_ctl.client_suggested_maxseg = 0;
rack->rc_catch_up = 0;
rack->r_ctl.bw_rate_cap = 0;
}
if (rack->r_ctl.rc_last_sft) {
rack->r_ctl.rc_last_sft = NULL;
}
if ((rc_cur->flags & TCP_TRK_TRACK_FLG_FSND) == 0) {
rc_cur->flags |= TCP_TRK_TRACK_FLG_FSND;
rc_cur->first_send = cts;
rc_cur->sent_at_fs = rack->rc_tp->t_sndbytes;
rc_cur->rxt_at_fs = rack->rc_tp->t_snd_rxt_bytes;
}
return;
}
tp = rack->rc_tp;
if ((rack->r_ctl.rc_last_sft != NULL) &&
(rack->r_ctl.rc_last_sft == rc_cur)) {
if (rack->rc_hybrid_mode)
rack_log_hybrid(rack, seq, rc_cur, HYBRID_LOG_ISSAME, __LINE__, 0);
return;
}
if (rack->rc_hybrid_mode == 0) {
rack->r_ctl.rc_last_sft = rc_cur;
if (orig_ent) {
orig_ent->sent_at_ls = rack->rc_tp->t_sndbytes;
orig_ent->rxt_at_ls = rack->rc_tp->t_snd_rxt_bytes;
orig_ent->flags |= TCP_TRK_TRACK_FLG_LSND;
}
rack_log_hybrid(rack, seq, rc_cur, HYBRID_LOG_RULES_APP, __LINE__, 0);
return;
}
if ((rc_cur->hybrid_flags & TCP_HYBRID_PACING_CSPR) && rc_cur->cspr){
if (rack->cspr_is_fcc == 0)
rack->r_ctl.bw_rate_cap = rack_compensate_for_linerate(rack, rc_cur->cspr);
else
rack->r_ctl.fillcw_cap = rack_compensate_for_linerate(rack, rc_cur->cspr);
} else {
if (rack->rc_hybrid_mode) {
if (rack->cspr_is_fcc == 0)
rack->r_ctl.bw_rate_cap = 0;
else
rack->r_ctl.fillcw_cap = rack_fillcw_bw_cap;
}
}
if (rc_cur->hybrid_flags & TCP_HYBRID_PACING_H_MS)
rack->r_ctl.client_suggested_maxseg = rc_cur->hint_maxseg;
else
rack->r_ctl.client_suggested_maxseg = 0;
if (rc_cur->timestamp == rack->r_ctl.last_tm_mark) {
rc_cur->hybrid_flags |= TCP_HYBRID_PACING_SENDTIME;
}
if ((rc_cur->hybrid_flags & TCP_HYBRID_PACING_CU) &&
(rc_cur->cspr > 0)) {
uint64_t len;
rack->rc_catch_up = 1;
if (rc_cur->hybrid_flags & TCP_HYBRID_PACING_SENDTIME) {
rc_cur->deadline = cts;
} else {
rc_cur->deadline = rc_cur->localtime;
}
len = rc_cur->end - rc_cur->start;
if (tp->t_inpcb.inp_socket->so_snd.sb_tls_info) {
len += tcp_estimate_tls_overhead(tp->t_inpcb.inp_socket, len);
}
len *= HPTS_USEC_IN_SEC;
len /= rc_cur->cspr;
rc_cur->deadline += len;
} else {
rack->rc_catch_up = 0;
rc_cur->deadline = 0;
}
if (rack->r_ctl.client_suggested_maxseg != 0) {
rack_set_pace_segments(tp, rack, __LINE__, NULL);
}
if (orig_ent) {
orig_ent->sent_at_ls = rack->rc_tp->t_sndbytes;
orig_ent->rxt_at_ls = rack->rc_tp->t_snd_rxt_bytes;
orig_ent->flags |= TCP_TRK_TRACK_FLG_LSND;
}
rack_log_hybrid(rack, seq, rc_cur, HYBRID_LOG_RULES_APP, __LINE__, 0);
rack->r_ctl.rc_last_sft = rc_cur;
rack->r_ctl.last_tm_mark = rc_cur->timestamp;
}
#endif
static void
rack_chk_req_and_hybrid_on_out(struct tcp_rack *rack, tcp_seq seq, uint32_t len, uint64_t cts)
{
#ifdef TCP_REQUEST_TRK
struct tcp_sendfile_track *ent;
ent = rack->r_ctl.rc_last_sft;
if ((ent == NULL) ||
(ent->flags == TCP_TRK_TRACK_FLG_EMPTY) ||
(SEQ_GEQ(seq, ent->end_seq))) {
rack_set_dgp_hybrid_mode(rack, seq, len, cts);
ent = rack->r_ctl.rc_last_sft;
}
if (ent == NULL) {
return;
}
if (SEQ_LT(ent->end_seq, (seq + len))) {
ent->end_seq = (seq + len);
if (rack->rc_hybrid_mode)
rack_log_hybrid_bw(rack, seq, len, 0, 0, HYBRID_LOG_EXTEND, 0, ent, __LINE__);
}
if ((ent->flags & TCP_TRK_TRACK_FLG_FSND) == 0) {
ent->flags |= TCP_TRK_TRACK_FLG_FSND;
ent->first_send = cts;
ent->sent_at_fs = rack->rc_tp->t_sndbytes;
ent->rxt_at_fs = rack->rc_tp->t_snd_rxt_bytes;
}
#endif
}
static void
rack_gain_for_fastoutput(struct tcp_rack *rack, struct tcpcb *tp, struct socket *so, uint32_t acked_amount)
{
uint32_t new_total, gating_val;
new_total = acked_amount + rack->r_ctl.fsb.left_to_send;
gating_val = min((sbavail(&so->so_snd) - (tp->snd_max - tp->snd_una)),
(tp->snd_wnd - (tp->snd_max - tp->snd_una)));
if (new_total <= gating_val) {
counter_u64_add(rack_extended_rfo, 1);
rack->r_ctl.fsb.left_to_send = new_total;
KASSERT((rack->r_ctl.fsb.left_to_send <= (sbavail(&rack->rc_inp->inp_socket->so_snd) - (tp->snd_max - tp->snd_una))),
("rack:%p left_to_send:%u sbavail:%u out:%u",
rack, rack->r_ctl.fsb.left_to_send,
sbavail(&rack->rc_inp->inp_socket->so_snd),
(tp->snd_max - tp->snd_una)));
}
}
static void
rack_adjust_sendmap_head(struct tcp_rack *rack, struct sockbuf *sb)
{
struct mbuf *m;
struct rack_sendmap *rsm;
tcp_seq snd_una;
#ifdef INVARIANTS
int first_processed = 0;
#endif
snd_una = rack->rc_tp->snd_una;
SOCKBUF_LOCK_ASSERT(sb);
m = sb->sb_mb;
rsm = tqhash_min(rack->r_ctl.tqh);
if ((rsm == NULL) || (m == NULL)) {
return;
}
KASSERT((rsm->m == m),
("Rack:%p sb:%p rsm:%p -- first rsm mbuf not aligned to sb",
rack, sb, rsm));
while (rsm->m && (rsm->m == m)) {
#ifdef INVARIANTS
struct mbuf *tm;
uint32_t soff;
tm = sbsndmbuf(sb, (rsm->r_start - snd_una), &soff);
if ((rsm->orig_m_len != m->m_len) ||
(rsm->orig_t_space != M_TRAILINGROOM(m))){
rack_adjust_orig_mlen(rsm);
}
if (first_processed == 0) {
KASSERT((rsm->soff == 0),
("Rack:%p rsm:%p -- rsm at head but soff not zero",
rack, rsm));
first_processed = 1;
}
if ((rsm->soff != soff) || (rsm->m != tm)) {
counter_u64_add(rack_adjust_map_bw, 1);
}
rsm->m = tm;
rsm->soff = soff;
if (tm) {
rsm->orig_m_len = rsm->m->m_len;
rsm->orig_t_space = M_TRAILINGROOM(rsm->m);
} else {
rsm->orig_m_len = 0;
rsm->orig_t_space = 0;
}
#else
rsm->m = sbsndmbuf(sb, (rsm->r_start - snd_una), &rsm->soff);
if (rsm->m) {
rsm->orig_m_len = rsm->m->m_len;
rsm->orig_t_space = M_TRAILINGROOM(rsm->m);
} else {
rsm->orig_m_len = 0;
rsm->orig_t_space = 0;
}
#endif
rsm = tqhash_next(rack->r_ctl.tqh, rsm);
if (rsm == NULL)
break;
}
}
#ifdef TCP_REQUEST_TRK
static inline void
rack_req_check_for_comp(struct tcp_rack *rack, tcp_seq th_ack)
{
struct tcp_sendfile_track *ent;
int i;
if ((rack->rc_hybrid_mode == 0) &&
(tcp_bblogging_point_on(rack->rc_tp, TCP_BBPOINT_REQ_LEVEL_LOGGING) == 0)) {
tcp_req_check_for_comp(rack->rc_tp, th_ack);
return;
}
ent = tcp_req_find_a_req_that_is_completed_by(rack->rc_tp, th_ack, &i);
while (ent != NULL) {
uint64_t laa, tim, data, cbw, ftim;
rack_log_hybrid(rack, th_ack,
ent, HYBRID_LOG_REQ_COMP, __LINE__, 0);
rack_log_hybrid_sends(rack, ent, __LINE__);
data = ent->end - ent->start;
laa = tcp_tv_to_lusec(&rack->r_ctl.act_rcv_time);
if (ent->flags & TCP_TRK_TRACK_FLG_FSND) {
if (ent->first_send > ent->localtime)
ftim = ent->first_send;
else
ftim = ent->localtime;
} else {
ftim = ent->localtime;
}
if (laa > ent->localtime)
tim = laa - ftim;
else
tim = 0;
cbw = data * HPTS_USEC_IN_SEC;
if (tim > 0)
cbw /= tim;
else
cbw = 0;
rack_log_hybrid_bw(rack, th_ack, cbw, tim, data, HYBRID_LOG_BW_MEASURE, 0, ent, __LINE__);
if (ent == rack->r_ctl.rc_last_sft) {
rack->r_ctl.rc_last_sft = NULL;
if (rack->rc_hybrid_mode) {
rack->rc_catch_up = 0;
if (rack->cspr_is_fcc == 0)
rack->r_ctl.bw_rate_cap = 0;
else
rack->r_ctl.fillcw_cap = rack_fillcw_bw_cap;
rack->r_ctl.client_suggested_maxseg = 0;
}
}
tcp_req_log_req_info(rack->rc_tp, ent,
i, TCP_TRK_REQ_LOG_FREED, 0, 0);
tcp_req_free_a_slot(rack->rc_tp, ent);
ent = tcp_req_find_a_req_that_is_completed_by(rack->rc_tp, th_ack, &i);
}
}
#endif
static int
rack_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, struct tcpopt *to,
uint32_t tiwin, int32_t tlen,
int32_t * ofia, int32_t thflags, int32_t *ret_val, int32_t orig_tlen)
{
int32_t ourfinisacked = 0;
int32_t nsegs, acked_amount;
int32_t acked;
struct mbuf *mfree;
struct tcp_rack *rack;
int32_t under_pacing = 0;
int32_t post_recovery = 0;
uint32_t p_cwnd;
INP_WLOCK_ASSERT(tptoinpcb(tp));
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (SEQ_GEQ(tp->snd_una, tp->iss + (65535 << tp->snd_scale))) {
tp->t_flags2 |= TF2_NO_ISS_CHECK;
}
if (!V_tcp_insecure_ack) {
tcp_seq seq_min;
bool ghost_ack_check;
if (tp->t_flags2 & TF2_NO_ISS_CHECK) {
seq_min = tp->snd_una - tp->max_sndwnd;
ghost_ack_check = false;
} else {
if (SEQ_GT(tp->iss + 1, tp->snd_una - tp->max_sndwnd)) {
seq_min = tp->iss + 1;
ghost_ack_check = true;
} else {
seq_min = tp->snd_una - tp->max_sndwnd;
ghost_ack_check = false;
}
}
if (SEQ_LT(th->th_ack, seq_min)) {
if (ghost_ack_check)
TCPSTAT_INC(tcps_rcvghostack);
else
TCPSTAT_INC(tcps_rcvacktooold);
ctf_do_dropafterack(m, tp, th, thflags, tlen, ret_val);
rack->r_wanted_output = 1;
return (1);
}
}
if (SEQ_GT(th->th_ack, tp->snd_max)) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, ret_val);
rack->r_wanted_output = 1;
return (1);
}
if (rack->gp_ready &&
(rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
under_pacing = 1;
}
if (SEQ_GEQ(th->th_ack, tp->snd_una) || to->to_nsacks) {
int in_rec, dup_ack_struck = 0;
int dsack_seen = 0, sacks_seen = 0;
in_rec = IN_FASTRECOVERY(tp->t_flags);
if (rack->rc_in_persist) {
tp->t_rxtshift = 0;
RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
}
if ((th->th_ack == tp->snd_una) &&
(tiwin == tp->snd_wnd) &&
(orig_tlen == 0) &&
((to->to_flags & TOF_SACK) == 0)) {
rack_strike_dupack(rack, th->th_ack);
dup_ack_struck = 1;
}
rack_log_ack(tp, to, th, ((in_rec == 0) && IN_FASTRECOVERY(tp->t_flags)),
dup_ack_struck, &dsack_seen, &sacks_seen);
}
if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) {
if (SEQ_LT(th->th_ack, tp->snd_una) && (sbspace(&so->so_rcv) > ctf_fixed_maxseg(tp))) {
rack->r_ctl.rc_reorder_ts = tcp_tv_to_usec(&rack->r_ctl.act_rcv_time);
if (rack->r_ctl.rc_reorder_ts == 0)
rack->r_ctl.rc_reorder_ts = 1;
}
return (0);
}
if (tp->t_flags & TF_NEEDSYN) {
tp->t_flags &= ~TF_NEEDSYN;
tp->snd_una++;
if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
(TF_RCVD_SCALE | TF_REQ_SCALE)) {
tp->rcv_scale = tp->request_r_scale;
}
}
nsegs = max(1, m->m_pkthdr.lro_nsegs);
acked = BYTES_THIS_ACK(tp, th);
if (acked) {
rack->probe_not_answered = 0;
}
KMOD_TCPSTAT_ADD(tcps_rcvackpack, nsegs);
KMOD_TCPSTAT_ADD(tcps_rcvackbyte, acked);
if ((tp->t_flags & TF_PREVVALID) &&
((tp->t_flags & TF_RCVD_TSTMP) == 0)) {
tp->t_flags &= ~TF_PREVVALID;
if (tp->t_rxtshift == 1 &&
(int)(ticks - tp->t_badrxtwin) < 0)
rack_cong_signal(tp, CC_RTO_ERR, th->th_ack, __LINE__);
}
if (acked) {
tp->t_rxtshift = 0;
RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
rack->rc_tlp_in_progress = 0;
rack->r_ctl.rc_tlp_cnt_out = 0;
if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT)
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
#ifdef TCP_REQUEST_TRK
rack_req_check_for_comp(rack, th->th_ack);
#endif
}
if (acked == 0) {
if (ofia)
*ofia = ourfinisacked;
return (0);
}
if (IN_RECOVERY(tp->t_flags)) {
if (SEQ_LT(th->th_ack, tp->snd_recover) &&
(SEQ_LT(th->th_ack, tp->snd_max))) {
tcp_rack_partialack(tp);
} else {
rack_post_recovery(tp, th->th_ack);
post_recovery = 1;
p_cwnd = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
p_cwnd <<= 1;
p_cwnd += tp->snd_cwnd;
}
} else if ((rack->rto_from_rec == 1) &&
SEQ_GEQ(th->th_ack, tp->snd_recover)) {
rack->rto_from_rec = 0;
}
rack_ack_received(tp, rack, th->th_ack, nsegs, CC_ACK, post_recovery);
if (post_recovery &&
(tp->snd_cwnd > p_cwnd)) {
tp->snd_cwnd = p_cwnd;
}
SOCK_SENDBUF_LOCK(so);
acked_amount = min(acked, (int)sbavail(&so->so_snd));
tp->snd_wnd -= acked_amount;
mfree = sbcut_locked(&so->so_snd, acked_amount);
if ((sbused(&so->so_snd) == 0) &&
(acked > acked_amount) &&
(tp->t_state >= TCPS_FIN_WAIT_1) &&
(tp->t_flags & TF_SENTFIN)) {
ourfinisacked = 1;
}
tp->snd_una = th->th_ack;
if (acked_amount && sbavail(&so->so_snd))
rack_adjust_sendmap_head(rack, &so->so_snd);
rack_log_wakeup(tp,rack, &so->so_snd, acked, 2);
sowwakeup_locked(so);
m_freem(mfree);
if (SEQ_GT(tp->snd_una, tp->snd_recover))
tp->snd_recover = tp->snd_una;
if (SEQ_LT(tp->snd_nxt, tp->snd_max)) {
tp->snd_nxt = tp->snd_max;
}
if (under_pacing &&
(rack->use_fixed_rate == 0) &&
(rack->in_probe_rtt == 0) &&
rack->rc_gp_dyn_mul &&
rack->rc_always_pace) {
rack_check_bottom_drag(tp, rack, so);
}
if (tp->snd_una == tp->snd_max) {
tp->t_flags &= ~TF_PREVVALID;
if (rack->r_ctl.rc_went_idle_time == 0)
rack->r_ctl.rc_went_idle_time = 1;
rack->r_ctl.retran_during_recovery = 0;
rack->r_ctl.dsack_byte_cnt = 0;
rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__);
if (sbavail(&tptosocket(tp)->so_snd) == 0)
tp->t_acktime = 0;
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
rack->rc_suspicious = 0;
rack->r_wanted_output = 1;
sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
(sbavail(&so->so_snd) == 0) &&
(tp->t_flags2 & TF2_DROP_AF_DATA)) {
*ret_val = 1;
tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
tp = tcp_close(tp);
ctf_do_dropwithreset(m, tp, th, tlen);
return (1);
}
}
if (ofia)
*ofia = ourfinisacked;
return (0);
}
static void
rack_log_collapse(struct tcp_rack *rack, uint32_t cnt, uint32_t split, uint32_t out, int line,
int dir, uint32_t flags, struct rack_sendmap *rsm)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = cnt;
log.u_bbr.flex2 = split;
log.u_bbr.flex3 = out;
log.u_bbr.flex4 = line;
log.u_bbr.flex5 = rack->r_must_retran;
log.u_bbr.flex6 = flags;
log.u_bbr.flex7 = rack->rc_has_collapsed;
log.u_bbr.flex8 = dir;
if (rsm == NULL)
log.u_bbr.rttProp = 0;
else
log.u_bbr.rttProp = (uintptr_t)rsm;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
TCP_RACK_LOG_COLLAPSE, 0,
0, &log, false, &tv);
}
}
static void
rack_collapsed_window(struct tcp_rack *rack, uint32_t out, tcp_seq th_ack, int line)
{
tcp_trace_point(rack->rc_tp, TCP_TP_COLLAPSED_WND);
if ((rack->rc_has_collapsed == 0) ||
(rack->r_ctl.last_collapse_point != (th_ack + rack->rc_tp->snd_wnd)))
counter_u64_add(rack_collapsed_win_seen, 1);
rack->r_ctl.last_collapse_point = th_ack + rack->rc_tp->snd_wnd;
rack->r_ctl.high_collapse_point = rack->rc_tp->snd_max;
rack->rc_has_collapsed = 1;
rack->r_collapse_point_valid = 1;
rack_log_collapse(rack, 0, th_ack, rack->r_ctl.last_collapse_point, line, 1, 0, NULL);
}
static void
rack_un_collapse_window(struct tcp_rack *rack, int line)
{
struct rack_sendmap *nrsm, *rsm;
int cnt = 0, split = 0;
int insret __diagused;
tcp_trace_point(rack->rc_tp, TCP_TP_COLLAPSED_WND);
rack->rc_has_collapsed = 0;
rsm = tqhash_find(rack->r_ctl.tqh, rack->r_ctl.last_collapse_point);
if (rsm == NULL) {
rack_log_collapse(rack, 0, 0, ctf_outstanding(rack->rc_tp), line, 0, 0, NULL);
return;
}
if (SEQ_GT(rack->r_ctl.last_collapse_point, rsm->r_start)) {
rack_log_collapse(rack, rsm->r_start, rsm->r_end,
rack->r_ctl.last_collapse_point, line, 3, rsm->r_flags, rsm);
nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT);
if (nrsm == NULL) {
nrsm = rsm;
goto no_split;
}
split = 1;
rack_clone_rsm(rack, nrsm, rsm, rack->r_ctl.last_collapse_point);
#ifndef INVARIANTS
(void)tqhash_insert(rack->r_ctl.tqh, nrsm);
#else
if ((insret = tqhash_insert(rack->r_ctl.tqh, nrsm)) != 0) {
panic("Insert in tailq_hash of %p fails ret:%d rack:%p rsm:%p",
nrsm, insret, rack, rsm);
}
#endif
rack_log_map_chg(rack->rc_tp, rack, NULL, rsm, nrsm, MAP_SPLIT,
rack->r_ctl.last_collapse_point, __LINE__);
if (rsm->r_in_tmap) {
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
nrsm->r_in_tmap = 1;
}
rsm = nrsm;
}
no_split:
TQHASH_FOREACH_FROM(nrsm, rack->r_ctl.tqh, rsm) {
cnt++;
nrsm->r_flags |= RACK_RWND_COLLAPSED;
rack_log_collapse(rack, nrsm->r_start, nrsm->r_end, 0, line, 4, nrsm->r_flags, nrsm);
cnt++;
}
if (cnt) {
counter_u64_add(rack_collapsed_win, 1);
}
rack_log_collapse(rack, cnt, split, ctf_outstanding(rack->rc_tp), line, 0, 0, NULL);
}
static void
rack_handle_delayed_ack(struct tcpcb *tp, struct tcp_rack *rack,
int32_t tlen, int32_t tfo_syn)
{
if (DELAY_ACK(tp, tlen) || tfo_syn) {
rack_timer_cancel(tp, rack,
rack->r_ctl.rc_rcvtime, __LINE__);
tp->t_flags |= TF_DELACK;
} else {
rack->r_wanted_output = 1;
tp->t_flags |= TF_ACKNOW;
}
}
static void
rack_validate_fo_sendwin_up(struct tcpcb *tp, struct tcp_rack *rack)
{
if (rack->r_fast_output) {
uint32_t out;
out = ctf_outstanding(tp);
if ((out + rack->r_ctl.fsb.left_to_send) > tp->snd_wnd) {
if (out >= tp->snd_wnd) {
rack->r_fast_output = 0;
} else {
rack->r_ctl.fsb.left_to_send = tp->snd_wnd - out;
if (rack->r_ctl.fsb.left_to_send < ctf_fixed_maxseg(tp)) {
rack->r_fast_output = 0;
}
}
}
}
}
static int
rack_process_data(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
{
int32_t nsegs;
int32_t tfo_syn;
struct tcp_rack *rack;
INP_WLOCK_ASSERT(tptoinpcb(tp));
rack = (struct tcp_rack *)tp->t_fb_ptr;
nsegs = max(1, m->m_pkthdr.lro_nsegs);
if ((thflags & TH_ACK) &&
(SEQ_LT(tp->snd_wl1, th->th_seq) ||
(tp->snd_wl1 == th->th_seq && (SEQ_LT(tp->snd_wl2, th->th_ack) ||
(tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd))))) {
if (tlen == 0 &&
tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd)
KMOD_TCPSTAT_INC(tcps_rcvwinupd);
tp->snd_wnd = tiwin;
rack_validate_fo_sendwin_up(tp, rack);
tp->snd_wl1 = th->th_seq;
tp->snd_wl2 = th->th_ack;
if (tp->snd_wnd > tp->max_sndwnd)
tp->max_sndwnd = tp->snd_wnd;
rack->r_wanted_output = 1;
} else if (thflags & TH_ACK) {
if ((tp->snd_wl2 == th->th_ack) && (tiwin < tp->snd_wnd)) {
tp->snd_wnd = tiwin;
rack_validate_fo_sendwin_up(tp, rack);
tp->snd_wl1 = th->th_seq;
tp->snd_wl2 = th->th_ack;
}
}
if (tp->snd_wnd < ctf_outstanding(tp))
rack_collapsed_window(rack, ctf_outstanding(tp), th->th_ack, __LINE__);
else if (rack->rc_has_collapsed)
rack_un_collapse_window(rack, __LINE__);
if ((rack->r_collapse_point_valid) &&
(SEQ_GT(th->th_ack, rack->r_ctl.high_collapse_point)))
rack->r_collapse_point_valid = 0;
if ((rack->rc_in_persist != 0) &&
(tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2),
rack->r_ctl.rc_pace_min_segs))) {
rack_exit_persist(tp, rack, rack->r_ctl.rc_rcvtime);
tp->snd_nxt = tp->snd_max;
rack->r_wanted_output = 1;
}
if ((rack->rc_in_persist == 0) &&
(tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) &&
TCPS_HAVEESTABLISHED(tp->t_state) &&
((tp->snd_max == tp->snd_una) || rack->rc_has_collapsed) &&
sbavail(&tptosocket(tp)->so_snd) &&
(sbavail(&tptosocket(tp)->so_snd) > tp->snd_wnd)) {
rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime, tp->snd_una);
}
if (tp->t_flags2 & TF2_DROP_AF_DATA) {
m_freem(m);
return (0);
}
tp->rcv_up = tp->rcv_nxt;
tfo_syn = ((tp->t_state == TCPS_SYN_RECEIVED) &&
(tp->t_flags & TF_FASTOPEN));
if ((tlen || (thflags & TH_FIN) || (tfo_syn && tlen > 0)) &&
TCPS_HAVERCVDFIN(tp->t_state) == 0) {
tcp_seq save_start = th->th_seq;
tcp_seq save_rnxt = tp->rcv_nxt;
int save_tlen = tlen;
m_adj(m, drop_hdrlen);
if (th->th_seq == tp->rcv_nxt &&
SEGQ_EMPTY(tp) &&
(TCPS_HAVEESTABLISHED(tp->t_state) ||
tfo_syn)) {
#ifdef NETFLIX_SB_LIMITS
u_int mcnt, appended;
if (so->so_rcv.sb_shlim) {
mcnt = m_memcnt(m);
appended = 0;
if (counter_fo_get(so->so_rcv.sb_shlim, mcnt,
CFO_NOSLEEP, NULL) == false) {
counter_u64_add(tcp_sb_shlim_fails, 1);
m_freem(m);
return (0);
}
}
#endif
rack_handle_delayed_ack(tp, rack, tlen, tfo_syn);
tp->rcv_nxt += tlen;
if (tlen &&
((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
(tp->t_fbyte_in == 0)) {
tp->t_fbyte_in = ticks;
if (tp->t_fbyte_in == 0)
tp->t_fbyte_in = 1;
if (tp->t_fbyte_out && tp->t_fbyte_in)
tp->t_flags2 |= TF2_FBYTES_COMPLETE;
}
thflags = tcp_get_flags(th) & TH_FIN;
KMOD_TCPSTAT_ADD(tcps_rcvpack, nsegs);
KMOD_TCPSTAT_ADD(tcps_rcvbyte, tlen);
SOCK_RECVBUF_LOCK(so);
if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
m_freem(m);
} else {
int32_t newsize;
if (tlen > 0) {
newsize = tcp_autorcvbuf(m, th, so, tp, tlen);
if (newsize)
if (!sbreserve_locked(so, SO_RCV, newsize, NULL))
so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
}
#ifdef NETFLIX_SB_LIMITS
appended =
#endif
sbappendstream_locked(&so->so_rcv, m, 0);
}
rack_log_wakeup(tp,rack, &so->so_rcv, tlen, 1);
sorwakeup_locked(so);
#ifdef NETFLIX_SB_LIMITS
if (so->so_rcv.sb_shlim && appended != mcnt)
counter_fo_release(so->so_rcv.sb_shlim,
mcnt - appended);
#endif
} else {
tcp_seq temp = save_start;
thflags = tcp_reass(tp, th, &temp, &tlen, m);
tp->t_flags |= TF_ACKNOW;
if (tp->t_flags & TF_WAKESOR) {
tp->t_flags &= ~TF_WAKESOR;
sorwakeup_locked(so);
}
}
if ((tp->t_flags & TF_SACK_PERMIT) &&
(save_tlen > 0) &&
TCPS_HAVEESTABLISHED(tp->t_state)) {
if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) {
tcp_update_sack_list(tp, save_start,
save_start + save_tlen);
} else if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) {
if ((tp->rcv_numsacks >= 1) &&
(tp->sackblks[0].end == save_start)) {
tcp_update_sack_list(tp,
tp->sackblks[0].start,
tp->sackblks[0].end);
} else {
tcp_update_dsack_list(tp, save_start,
save_start + save_tlen);
}
} else if (tlen >= save_tlen) {
tcp_update_dsack_list(tp, save_start,
save_start + save_tlen);
} else if (tlen > 0) {
tcp_update_dsack_list(tp, save_start,
save_start + tlen);
}
}
} else {
m_freem(m);
thflags &= ~TH_FIN;
}
if (thflags & TH_FIN) {
if (TCPS_HAVERCVDFIN(tp->t_state) == 0) {
socantrcvmore(so);
if (tp->t_flags & TF_NEEDSYN) {
rack_timer_cancel(tp, rack,
rack->r_ctl.rc_rcvtime, __LINE__);
tp->t_flags |= TF_DELACK;
} else {
tp->t_flags |= TF_ACKNOW;
}
tp->rcv_nxt++;
}
switch (tp->t_state) {
case TCPS_SYN_RECEIVED:
tp->t_starttime = ticks;
case TCPS_ESTABLISHED:
rack_timer_cancel(tp, rack,
rack->r_ctl.rc_rcvtime, __LINE__);
tcp_state_change(tp, TCPS_CLOSE_WAIT);
break;
case TCPS_FIN_WAIT_1:
rack_timer_cancel(tp, rack,
rack->r_ctl.rc_rcvtime, __LINE__);
tcp_state_change(tp, TCPS_CLOSING);
break;
case TCPS_FIN_WAIT_2:
rack_timer_cancel(tp, rack,
rack->r_ctl.rc_rcvtime, __LINE__);
tcp_twstart(tp);
return (1);
}
}
if ((tp->t_flags & TF_ACKNOW) ||
(sbavail(&so->so_snd) > (tp->snd_max - tp->snd_una))) {
rack->r_wanted_output = 1;
}
return (0);
}
static int
rack_do_fastnewdata(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t nxt_pkt, uint8_t iptos)
{
int32_t nsegs;
int32_t newsize = 0;
struct tcp_rack *rack;
#ifdef NETFLIX_SB_LIMITS
u_int mcnt, appended;
#endif
if (__predict_false(th->th_seq != tp->rcv_nxt)) {
return (0);
}
if (tiwin && tiwin != tp->snd_wnd) {
return (0);
}
if (__predict_false((tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN)))) {
return (0);
}
if (__predict_false((to->to_flags & TOF_TS) &&
(TSTMP_LT(to->to_tsval, tp->ts_recent)))) {
return (0);
}
if (__predict_false((th->th_ack != tp->snd_una))) {
return (0);
}
if (__predict_false(tlen > sbspace(&so->so_rcv))) {
return (0);
}
if ((to->to_flags & TOF_TS) != 0 &&
SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
tp->ts_recent_age = tcp_ts_getticks();
tp->ts_recent = to->to_tsval;
}
rack = (struct tcp_rack *)tp->t_fb_ptr;
nsegs = max(1, m->m_pkthdr.lro_nsegs);
#ifdef NETFLIX_SB_LIMITS
if (so->so_rcv.sb_shlim) {
mcnt = m_memcnt(m);
appended = 0;
if (counter_fo_get(so->so_rcv.sb_shlim, mcnt,
CFO_NOSLEEP, NULL) == false) {
counter_u64_add(tcp_sb_shlim_fails, 1);
m_freem(m);
return (1);
}
}
#endif
if (tp->rcv_numsacks)
tcp_clean_sackreport(tp);
KMOD_TCPSTAT_INC(tcps_preddat);
tp->rcv_nxt += tlen;
if (tlen &&
((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
(tp->t_fbyte_in == 0)) {
tp->t_fbyte_in = ticks;
if (tp->t_fbyte_in == 0)
tp->t_fbyte_in = 1;
if (tp->t_fbyte_out && tp->t_fbyte_in)
tp->t_flags2 |= TF2_FBYTES_COMPLETE;
}
tp->snd_wl1 = th->th_seq;
tp->rcv_up = tp->rcv_nxt;
KMOD_TCPSTAT_ADD(tcps_rcvpack, nsegs);
KMOD_TCPSTAT_ADD(tcps_rcvbyte, tlen);
newsize = tcp_autorcvbuf(m, th, so, tp, tlen);
SOCK_RECVBUF_LOCK(so);
if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
m_freem(m);
} else {
if (newsize)
if (!sbreserve_locked(so, SO_RCV, newsize, NULL))
so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
m_adj(m, drop_hdrlen);
#ifdef NETFLIX_SB_LIMITS
appended =
#endif
sbappendstream_locked(&so->so_rcv, m, 0);
ctf_calc_rwin(so, tp);
}
rack_log_wakeup(tp,rack, &so->so_rcv, tlen, 1);
sorwakeup_locked(so);
#ifdef NETFLIX_SB_LIMITS
if (so->so_rcv.sb_shlim && mcnt != appended)
counter_fo_release(so->so_rcv.sb_shlim, mcnt - appended);
#endif
rack_handle_delayed_ack(tp, rack, tlen, 0);
if (tp->snd_una == tp->snd_max)
sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
return (1);
}
static int
rack_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t nxt_pkt, uint32_t cts)
{
int32_t acked;
int32_t nsegs;
int32_t under_pacing = 0;
struct tcp_rack *rack;
if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) {
return (0);
}
if (__predict_false(SEQ_GT(th->th_ack, tp->snd_max))) {
return (0);
}
if (__predict_false(tiwin == 0)) {
return (0);
}
if (__predict_false(tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN))) {
return (0);
}
if ((to->to_flags & TOF_TS) && __predict_false(TSTMP_LT(to->to_tsval, tp->ts_recent))) {
return (0);
}
if (__predict_false(IN_RECOVERY(tp->t_flags))) {
return (0);
}
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (rack->r_ctl.rc_sacked) {
return (0);
}
if (rack->gp_ready &&
(rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
under_pacing = 1;
}
nsegs = max(1, m->m_pkthdr.lro_nsegs);
rack_log_ack(tp, to, th, 0, 0, NULL, NULL);
if (tiwin != tp->snd_wnd) {
tp->snd_wnd = tiwin;
rack_validate_fo_sendwin_up(tp, rack);
tp->snd_wl1 = th->th_seq;
if (tp->snd_wnd > tp->max_sndwnd)
tp->max_sndwnd = tp->snd_wnd;
}
if ((rack->rc_in_persist != 0) &&
(tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2),
rack->r_ctl.rc_pace_min_segs))) {
rack_exit_persist(tp, rack, cts);
}
if ((rack->rc_in_persist == 0) &&
(tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) &&
TCPS_HAVEESTABLISHED(tp->t_state) &&
((tp->snd_max == tp->snd_una) || rack->rc_has_collapsed) &&
sbavail(&tptosocket(tp)->so_snd) &&
(sbavail(&tptosocket(tp)->so_snd) > tp->snd_wnd)) {
rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime, th->th_ack);
}
if ((to->to_flags & TOF_TS) != 0 &&
SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
tp->ts_recent_age = tcp_ts_getticks();
tp->ts_recent = to->to_tsval;
}
KMOD_TCPSTAT_INC(tcps_predack);
if ((tp->t_flags & TF_PREVVALID) &&
((tp->t_flags & TF_RCVD_TSTMP) == 0)) {
tp->t_flags &= ~TF_PREVVALID;
if (tp->t_rxtshift == 1 &&
(int)(ticks - tp->t_badrxtwin) < 0)
rack_cong_signal(tp, CC_RTO_ERR, th->th_ack, __LINE__);
}
acked = BYTES_THIS_ACK(tp, th);
#ifdef TCP_HHOOK
hhook_run_tcp_est_in(tp, th, to);
#endif
KMOD_TCPSTAT_ADD(tcps_rcvackpack, nsegs);
KMOD_TCPSTAT_ADD(tcps_rcvackbyte, acked);
if (acked) {
struct mbuf *mfree;
rack_ack_received(tp, rack, th->th_ack, nsegs, CC_ACK, 0);
SOCK_SENDBUF_LOCK(so);
mfree = sbcut_locked(&so->so_snd, acked);
tp->snd_una = th->th_ack;
rack_adjust_sendmap_head(rack, &so->so_snd);
rack_log_wakeup(tp,rack, &so->so_snd, acked, 2);
sowwakeup_locked(so);
m_freem(mfree);
tp->t_rxtshift = 0;
RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
rack->rc_tlp_in_progress = 0;
rack->r_ctl.rc_tlp_cnt_out = 0;
if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT)
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
#ifdef TCP_REQUEST_TRK
rack_req_check_for_comp(rack, th->th_ack);
#endif
}
if (tp->snd_wnd < ctf_outstanding(tp)) {
rack_collapsed_window(rack, ctf_outstanding(tp), th->th_ack, __LINE__);
} else if (rack->rc_has_collapsed)
rack_un_collapse_window(rack, __LINE__);
if ((rack->r_collapse_point_valid) &&
(SEQ_GT(tp->snd_una, rack->r_ctl.high_collapse_point)))
rack->r_collapse_point_valid = 0;
tp->snd_wl2 = th->th_ack;
tp->t_dupacks = 0;
m_freem(m);
if (under_pacing &&
(rack->use_fixed_rate == 0) &&
(rack->in_probe_rtt == 0) &&
rack->rc_gp_dyn_mul &&
rack->rc_always_pace) {
rack_check_bottom_drag(tp, rack, so);
}
if (tp->snd_una == tp->snd_max) {
tp->t_flags &= ~TF_PREVVALID;
rack->r_ctl.retran_during_recovery = 0;
rack->rc_suspicious = 0;
rack->r_ctl.dsack_byte_cnt = 0;
rack->r_ctl.rc_went_idle_time = tcp_get_usecs(NULL);
if (rack->r_ctl.rc_went_idle_time == 0)
rack->r_ctl.rc_went_idle_time = 1;
rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__);
if (sbavail(&tptosocket(tp)->so_snd) == 0)
tp->t_acktime = 0;
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
}
if (acked && rack->r_fast_output)
rack_gain_for_fastoutput(rack, tp, so, (uint32_t)acked);
if (sbavail(&so->so_snd)) {
rack->r_wanted_output = 1;
}
return (1);
}
static int
rack_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
{
int32_t ret_val = 0;
int32_t orig_tlen = tlen;
int32_t todrop;
int32_t ourfinisacked = 0;
struct tcp_rack *rack;
INP_WLOCK_ASSERT(tptoinpcb(tp));
ctf_calc_rwin(so, tp);
if ((thflags & TH_ACK) &&
(SEQ_LEQ(th->th_ack, tp->iss) ||
SEQ_GT(th->th_ack, tp->snd_max))) {
tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, tlen);
return (1);
}
if ((thflags & (TH_ACK | TH_RST)) == (TH_ACK | TH_RST)) {
TCP_PROBE5(connect__refused, NULL, tp,
mtod(m, const char *), tp, th);
tp = tcp_drop(tp, ECONNREFUSED);
ctf_do_drop(m, tp);
return (1);
}
if (thflags & TH_RST) {
ctf_do_drop(m, tp);
return (1);
}
if (!(thflags & TH_SYN)) {
ctf_do_drop(m, tp);
return (1);
}
tp->irs = th->th_seq;
tcp_rcvseqinit(tp);
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (thflags & TH_ACK) {
int tfo_partial = 0;
KMOD_TCPSTAT_INC(tcps_connects);
soisconnected(so);
#ifdef MAC
mac_socketpeer_set_from_mbuf(m, so);
#endif
if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
(TF_RCVD_SCALE | TF_REQ_SCALE)) {
tp->rcv_scale = tp->request_r_scale;
}
tp->rcv_adv += min(tp->rcv_wnd,
TCP_MAXWIN << tp->rcv_scale);
if ((tp->t_flags & TF_FASTOPEN) &&
(tp->snd_una != tp->snd_max)) {
if (SEQ_LT(th->th_ack, tp->snd_max))
tfo_partial = 1;
}
if (DELAY_ACK(tp, tlen) && tlen != 0 && !tfo_partial) {
rack_timer_cancel(tp, rack,
rack->r_ctl.rc_rcvtime, __LINE__);
tp->t_flags |= TF_DELACK;
} else {
rack->r_wanted_output = 1;
tp->t_flags |= TF_ACKNOW;
}
tcp_ecn_input_syn_sent(tp, thflags, iptos);
if (SEQ_GT(th->th_ack, tp->snd_una)) {
tp->snd_una++;
if (tfo_partial && (SEQ_GT(tp->snd_max, tp->snd_una))) {
struct rack_sendmap *rsm;
rsm = tqhash_min(rack->r_ctl.tqh);
if (rsm) {
if (rsm->r_flags & RACK_HAS_SYN) {
rsm->r_flags &= ~RACK_HAS_SYN;
rsm->r_start++;
}
rack->r_ctl.rc_resend = rsm;
}
}
}
tp->t_starttime = ticks;
if (tp->t_flags & TF_NEEDFIN) {
tcp_state_change(tp, TCPS_FIN_WAIT_1);
tp->t_flags &= ~TF_NEEDFIN;
thflags &= ~TH_SYN;
} else {
tcp_state_change(tp, TCPS_ESTABLISHED);
TCP_PROBE5(connect__established, NULL, tp,
mtod(m, const char *), tp, th);
rack_cc_conn_init(tp);
}
} else {
tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN | TF_SONOTCONN);
tcp_state_change(tp, TCPS_SYN_RECEIVED);
}
th->th_seq++;
if (tlen > tp->rcv_wnd) {
todrop = tlen - tp->rcv_wnd;
m_adj(m, -todrop);
tlen = tp->rcv_wnd;
thflags &= ~TH_FIN;
KMOD_TCPSTAT_INC(tcps_rcvpackafterwin);
KMOD_TCPSTAT_ADD(tcps_rcvbyteafterwin, todrop);
}
tp->snd_wl1 = th->th_seq - 1;
tp->rcv_up = th->th_seq;
if (thflags & TH_ACK) {
if ((to->to_flags & TOF_TS) != 0 && to->to_tsecr) {
uint32_t t, mcts;
mcts = tcp_ts_getticks();
t = (mcts - to->to_tsecr) * HPTS_USEC_IN_MSEC;
if (!tp->t_rttlow || tp->t_rttlow > t)
tp->t_rttlow = t;
rack_log_rtt_sample_calc(rack, t, (to->to_tsecr * 1000), (mcts * 1000), 4);
tcp_rack_xmit_timer(rack, t + 1, 1, t, 0, NULL, 2);
tcp_rack_xmit_timer_commit(rack, tp);
}
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val, orig_tlen))
return (ret_val);
if (tp->t_state == TCPS_FIN_WAIT_1) {
if (ourfinisacked) {
if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
soisdisconnected(so);
tcp_timer_activate(tp, TT_2MSL,
(tcp_fast_finwait2_recycle ?
tcp_finwait2_timeout :
TP_MAXIDLE(tp)));
}
tcp_state_change(tp, TCPS_FIN_WAIT_2);
}
}
}
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
}
static int
rack_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
{
struct tcp_rack *rack;
int32_t orig_tlen = tlen;
int32_t ret_val = 0;
int32_t ourfinisacked = 0;
rack = (struct tcp_rack *)tp->t_fb_ptr;
ctf_calc_rwin(so, tp);
if ((thflags & TH_RST) ||
(tp->t_fin_is_rst && (thflags & TH_FIN)))
return (ctf_process_rst(m, th, so, tp));
if ((thflags & TH_ACK) &&
(SEQ_LEQ(th->th_ack, tp->snd_una) ||
SEQ_GT(th->th_ack, tp->snd_max))) {
tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, tlen);
return (1);
}
if (tp->t_flags & TF_FASTOPEN) {
if ((thflags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) {
tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, tlen);
return (1);
} else if (thflags & TH_SYN) {
if ((rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT) ||
(rack->r_ctl.rc_hpts_flags & PACE_TMR_TLP) ||
(rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK)) {
ctf_do_drop(m, NULL);
return (0);
}
} else if (!(thflags & (TH_ACK | TH_FIN | TH_RST))) {
ctf_do_drop(m, NULL);
return (0);
}
}
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
if (SEQ_LT(th->th_seq, tp->irs)) {
tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, tlen);
return (1);
}
if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
if ((to->to_flags & TOF_TS) != 0 &&
SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
((thflags & (TH_SYN | TH_FIN)) != 0))) {
tp->ts_recent_age = tcp_ts_getticks();
tp->ts_recent = to->to_tsval;
}
tp->snd_wnd = tiwin;
rack_validate_fo_sendwin_up(tp, rack);
if ((thflags & TH_ACK) == 0) {
if (tp->t_flags & TF_FASTOPEN) {
rack_cc_conn_init(tp);
}
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
}
KMOD_TCPSTAT_INC(tcps_connects);
if (tp->t_flags & TF_SONOTCONN) {
tp->t_flags &= ~TF_SONOTCONN;
soisconnected(so);
}
if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
(TF_RCVD_SCALE | TF_REQ_SCALE)) {
tp->rcv_scale = tp->request_r_scale;
}
tp->t_starttime = ticks;
if ((tp->t_flags & TF_FASTOPEN) && tp->t_tfo_pending) {
tcp_fastopen_decrement_counter(tp->t_tfo_pending);
tp->t_tfo_pending = NULL;
}
if (tp->t_flags & TF_NEEDFIN) {
tcp_state_change(tp, TCPS_FIN_WAIT_1);
tp->t_flags &= ~TF_NEEDFIN;
} else {
tcp_state_change(tp, TCPS_ESTABLISHED);
TCP_PROBE5(accept__established, NULL, tp,
mtod(m, const char *), tp, th);
if (!(tp->t_flags & TF_FASTOPEN))
rack_cc_conn_init(tp);
}
if (SEQ_GT(th->th_ack, tp->snd_una) && !(tp->t_flags & TF_NEEDSYN))
tp->snd_una++;
if (tlen == 0 && (thflags & TH_FIN) == 0) {
(void) tcp_reass(tp, (struct tcphdr *)0, NULL, 0,
(struct mbuf *)0);
if (tp->t_flags & TF_WAKESOR) {
tp->t_flags &= ~TF_WAKESOR;
sorwakeup_locked(so);
}
}
tp->snd_wl1 = th->th_seq - 1;
if ((to->to_flags & TOF_TS) != 0 && to->to_tsecr) {
uint32_t t, mcts;
mcts = tcp_ts_getticks();
t = (mcts - to->to_tsecr) * HPTS_USEC_IN_MSEC;
if (!tp->t_rttlow || tp->t_rttlow > t)
tp->t_rttlow = t;
rack_log_rtt_sample_calc(rack, t, (to->to_tsecr * 1000), (mcts * 1000), 5);
tcp_rack_xmit_timer(rack, t + 1, 1, t, 0, NULL, 2);
tcp_rack_xmit_timer_commit(rack, tp);
}
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val, orig_tlen)) {
return (ret_val);
}
if (tp->t_state == TCPS_FIN_WAIT_1) {
if (ourfinisacked) {
if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
soisdisconnected(so);
tcp_timer_activate(tp, TT_2MSL,
(tcp_fast_finwait2_recycle ?
tcp_finwait2_timeout :
TP_MAXIDLE(tp)));
}
tcp_state_change(tp, TCPS_FIN_WAIT_2);
}
}
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
}
static int
rack_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
{
int32_t ret_val = 0;
int32_t orig_tlen = tlen;
struct tcp_rack *rack;
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (__predict_true(((to->to_flags & TOF_SACK) == 0)) &&
__predict_true((thflags & (TH_SYN | TH_FIN | TH_RST | TH_ACK)) == TH_ACK) &&
__predict_true(SEGQ_EMPTY(tp)) &&
__predict_true(th->th_seq == tp->rcv_nxt)) {
if (tlen == 0) {
if (rack_fastack(m, th, so, tp, to, drop_hdrlen, tlen,
tiwin, nxt_pkt, rack->r_ctl.rc_rcvtime)) {
return (0);
}
} else {
if (rack_do_fastnewdata(m, th, so, tp, to, drop_hdrlen, tlen,
tiwin, nxt_pkt, iptos)) {
return (0);
}
}
}
ctf_calc_rwin(so, tp);
if ((thflags & TH_RST) ||
(tp->t_fin_is_rst && (thflags & TH_FIN)))
return (ctf_process_rst(m, th, so, tp));
if (thflags & TH_SYN) {
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
return (ret_val);
}
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
if ((to->to_flags & TOF_TS) != 0 &&
SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
((thflags & (TH_SYN | TH_FIN)) != 0))) {
tp->ts_recent_age = tcp_ts_getticks();
tp->ts_recent = to->to_tsval;
}
if ((thflags & TH_ACK) == 0) {
if (tp->t_flags & TF_NEEDSYN) {
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
return (0);
}
}
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val, orig_tlen)) {
return (ret_val);
}
if (sbavail(&so->so_snd)) {
if (ctf_progress_timeout_check(tp, true)) {
rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, tlen);
return (1);
}
}
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
}
static int
rack_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
{
int32_t ret_val = 0;
int32_t orig_tlen = tlen;
ctf_calc_rwin(so, tp);
if ((thflags & TH_RST) ||
(tp->t_fin_is_rst && (thflags & TH_FIN)))
return (ctf_process_rst(m, th, so, tp));
if (thflags & TH_SYN) {
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
return (ret_val);
}
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
if ((to->to_flags & TOF_TS) != 0 &&
SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
((thflags & (TH_SYN | TH_FIN)) != 0))) {
tp->ts_recent_age = tcp_ts_getticks();
tp->ts_recent = to->to_tsval;
}
if ((thflags & TH_ACK) == 0) {
if (tp->t_flags & TF_NEEDSYN) {
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
return (0);
}
}
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val, orig_tlen)) {
return (ret_val);
}
if (sbavail(&so->so_snd)) {
if (ctf_progress_timeout_check(tp, true)) {
rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, tlen);
return (1);
}
}
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
}
static int
rack_check_data_after_close(struct mbuf *m,
struct tcpcb *tp, int32_t *tlen, struct tcphdr *th, struct socket *so)
{
struct tcp_rack *rack;
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (rack->rc_allow_data_af_clo == 0) {
close_now:
tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE);
tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
tp = tcp_close(tp);
KMOD_TCPSTAT_INC(tcps_rcvafterclose);
ctf_do_dropwithreset(m, tp, th, *tlen);
return (1);
}
if (sbavail(&so->so_snd) == 0)
goto close_now;
tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE);
tp->rcv_nxt = th->th_seq + *tlen;
tp->t_flags2 |= TF2_DROP_AF_DATA;
rack->r_wanted_output = 1;
*tlen = 0;
return (0);
}
static int
rack_do_fin_wait_1(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
{
int32_t ret_val = 0;
int32_t orig_tlen = tlen;
int32_t ourfinisacked = 0;
ctf_calc_rwin(so, tp);
if ((thflags & TH_RST) ||
(tp->t_fin_is_rst && (thflags & TH_FIN)))
return (ctf_process_rst(m, th, so, tp));
if (thflags & TH_SYN) {
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
return (ret_val);
}
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
if ((tp->t_flags & TF_CLOSED) && tlen &&
rack_check_data_after_close(m, tp, &tlen, th, so))
return (1);
if ((to->to_flags & TOF_TS) != 0 &&
SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
((thflags & (TH_SYN | TH_FIN)) != 0))) {
tp->ts_recent_age = tcp_ts_getticks();
tp->ts_recent = to->to_tsval;
}
if ((thflags & TH_ACK) == 0) {
if (tp->t_flags & TF_NEEDSYN) {
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
return (0);
}
}
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val, orig_tlen)) {
return (ret_val);
}
if (ourfinisacked) {
if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
soisdisconnected(so);
tcp_timer_activate(tp, TT_2MSL,
(tcp_fast_finwait2_recycle ?
tcp_finwait2_timeout :
TP_MAXIDLE(tp)));
}
tcp_state_change(tp, TCPS_FIN_WAIT_2);
}
if (sbavail(&so->so_snd)) {
if (ctf_progress_timeout_check(tp, true)) {
rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, tlen);
return (1);
}
}
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
}
static int
rack_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
{
int32_t ret_val = 0;
int32_t orig_tlen = tlen;
int32_t ourfinisacked = 0;
ctf_calc_rwin(so, tp);
if ((thflags & TH_RST) ||
(tp->t_fin_is_rst && (thflags & TH_FIN)))
return (ctf_process_rst(m, th, so, tp));
if (thflags & TH_SYN) {
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
return (ret_val);
}
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
if ((to->to_flags & TOF_TS) != 0 &&
SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
((thflags & (TH_SYN | TH_FIN)) != 0))) {
tp->ts_recent_age = tcp_ts_getticks();
tp->ts_recent = to->to_tsval;
}
if ((thflags & TH_ACK) == 0) {
if (tp->t_flags & TF_NEEDSYN) {
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
return (0);
}
}
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val, orig_tlen)) {
return (ret_val);
}
if (ourfinisacked) {
tcp_twstart(tp);
m_freem(m);
return (1);
}
if (sbavail(&so->so_snd)) {
if (ctf_progress_timeout_check(tp, true)) {
rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, tlen);
return (1);
}
}
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
}
static int
rack_do_lastack(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
{
int32_t ret_val = 0;
int32_t orig_tlen;
int32_t ourfinisacked = 0;
ctf_calc_rwin(so, tp);
if ((thflags & TH_RST) ||
(tp->t_fin_is_rst && (thflags & TH_FIN)))
return (ctf_process_rst(m, th, so, tp));
if (thflags & TH_SYN) {
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
return (ret_val);
}
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
orig_tlen = tlen;
if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
if ((to->to_flags & TOF_TS) != 0 &&
SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
((thflags & (TH_SYN | TH_FIN)) != 0))) {
tp->ts_recent_age = tcp_ts_getticks();
tp->ts_recent = to->to_tsval;
}
if ((thflags & TH_ACK) == 0) {
if (tp->t_flags & TF_NEEDSYN) {
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
return (0);
}
}
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val, orig_tlen)) {
return (ret_val);
}
if (ourfinisacked) {
tp = tcp_close(tp);
ctf_do_drop(m, tp);
return (1);
}
if (sbavail(&so->so_snd)) {
if (ctf_progress_timeout_check(tp, true)) {
rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, tlen);
return (1);
}
}
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
}
static int
rack_do_fin_wait_2(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
{
int32_t ret_val = 0;
int32_t orig_tlen = tlen;
int32_t ourfinisacked = 0;
ctf_calc_rwin(so, tp);
if ((thflags & TH_RST) ||
(tp->t_fin_is_rst && (thflags & TH_FIN)))
return (ctf_process_rst(m, th, so, tp));
if (thflags & TH_SYN) {
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
return (ret_val);
}
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
if ((tp->t_flags & TF_CLOSED) && tlen &&
rack_check_data_after_close(m, tp, &tlen, th, so))
return (1);
if ((to->to_flags & TOF_TS) != 0 &&
SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
((thflags & (TH_SYN | TH_FIN)) != 0))) {
tp->ts_recent_age = tcp_ts_getticks();
tp->ts_recent = to->to_tsval;
}
if ((thflags & TH_ACK) == 0) {
if (tp->t_flags & TF_NEEDSYN) {
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
return (0);
}
}
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val, orig_tlen)) {
return (ret_val);
}
if (sbavail(&so->so_snd)) {
if (ctf_progress_timeout_check(tp, true)) {
rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, tlen);
return (1);
}
}
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
}
static void inline
rack_clear_rate_sample(struct tcp_rack *rack)
{
rack->r_ctl.rack_rs.rs_flags = RACK_RTT_EMPTY;
rack->r_ctl.rack_rs.rs_rtt_cnt = 0;
rack->r_ctl.rack_rs.rs_rtt_tot = 0;
}
static void
rack_set_pace_segments(struct tcpcb *tp, struct tcp_rack *rack, uint32_t line, uint64_t *fill_override)
{
uint64_t bw_est, rate_wanted;
int chged = 0;
uint32_t user_max, orig_min, orig_max;
#ifdef TCP_REQUEST_TRK
if (rack->rc_hybrid_mode &&
(rack->r_ctl.rc_pace_max_segs != 0) &&
(rack_hybrid_allow_set_maxseg == 1) &&
(rack->r_ctl.rc_last_sft != NULL)) {
rack->r_ctl.rc_last_sft->hybrid_flags &= ~TCP_HYBRID_PACING_SETMSS;
return;
}
#endif
orig_min = rack->r_ctl.rc_pace_min_segs;
orig_max = rack->r_ctl.rc_pace_max_segs;
user_max = ctf_fixed_maxseg(tp) * rack->rc_user_set_max_segs;
if (ctf_fixed_maxseg(tp) != rack->r_ctl.rc_pace_min_segs)
chged = 1;
rack->r_ctl.rc_pace_min_segs = ctf_fixed_maxseg(tp);
if (rack->use_fixed_rate || rack->rc_force_max_seg) {
if (user_max != rack->r_ctl.rc_pace_max_segs)
chged = 1;
}
if (rack->rc_force_max_seg) {
rack->r_ctl.rc_pace_max_segs = user_max;
} else if (rack->use_fixed_rate) {
bw_est = rack_get_bw(rack);
if ((rack->r_ctl.crte == NULL) ||
(bw_est != rack->r_ctl.crte->rate)) {
rack->r_ctl.rc_pace_max_segs = user_max;
} else {
uint32_t segsiz, pace_one;
if (rack_pace_one_seg ||
(rack->r_ctl.rc_user_set_min_segs == 1))
pace_one = 1;
else
pace_one = 0;
segsiz = min(ctf_fixed_maxseg(tp),
rack->r_ctl.rc_pace_min_segs);
rack->r_ctl.rc_pace_max_segs = tcp_get_pacing_burst_size_w_divisor(
tp, bw_est, segsiz, pace_one,
rack->r_ctl.crte, NULL, rack->r_ctl.pace_len_divisor);
}
} else if (rack->rc_always_pace) {
if (rack->r_ctl.gp_bw ||
rack->r_ctl.init_rate) {
uint32_t orig;
bw_est = rack_get_bw(rack);
orig = rack->r_ctl.rc_pace_max_segs;
if (fill_override)
rate_wanted = *fill_override;
else
rate_wanted = rack_get_gp_est(rack);
if (rate_wanted) {
rack->r_ctl.rc_pace_max_segs = rack_get_pacing_len(rack,
rate_wanted,
ctf_fixed_maxseg(rack->rc_tp));
} else
rack->r_ctl.rc_pace_max_segs = rack->r_ctl.rc_pace_min_segs;
if (orig != rack->r_ctl.rc_pace_max_segs)
chged = 1;
} else if ((rack->r_ctl.gp_bw == 0) &&
(rack->r_ctl.rc_pace_max_segs == 0)) {
chged = 1;
rack->r_ctl.rc_pace_max_segs = rc_init_window(rack);
}
}
if (rack->r_ctl.rc_pace_max_segs > PACE_MAX_IP_BYTES) {
chged = 1;
rack->r_ctl.rc_pace_max_segs = PACE_MAX_IP_BYTES;
}
if (chged)
rack_log_type_pacing_sizes(tp, rack, orig_min, orig_max, line, 2);
}
static void
rack_init_fsb_block(struct tcpcb *tp, struct tcp_rack *rack, int32_t flags)
{
#ifdef INET6
struct ip6_hdr *ip6 = NULL;
#endif
#ifdef INET
struct ip *ip = NULL;
#endif
struct udphdr *udp = NULL;
#ifdef INET6
if (rack->r_is_v6) {
rack->r_ctl.fsb.tcp_ip_hdr_len = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
ip6 = (struct ip6_hdr *)rack->r_ctl.fsb.tcp_ip_hdr;
if (tp->t_port) {
rack->r_ctl.fsb.tcp_ip_hdr_len += sizeof(struct udphdr);
udp = (struct udphdr *)((caddr_t)ip6 + sizeof(struct ip6_hdr));
udp->uh_sport = htons(V_tcp_udp_tunneling_port);
udp->uh_dport = tp->t_port;
rack->r_ctl.fsb.udp = udp;
rack->r_ctl.fsb.th = (struct tcphdr *)(udp + 1);
} else
{
rack->r_ctl.fsb.th = (struct tcphdr *)(ip6 + 1);
rack->r_ctl.fsb.udp = NULL;
}
tcpip_fillheaders(rack->rc_inp,
tp->t_port,
ip6, rack->r_ctl.fsb.th);
rack->r_ctl.fsb.hoplimit = in6_selecthlim(rack->rc_inp, NULL);
} else
#endif
#ifdef INET
{
rack->r_ctl.fsb.tcp_ip_hdr_len = sizeof(struct tcpiphdr);
ip = (struct ip *)rack->r_ctl.fsb.tcp_ip_hdr;
if (tp->t_port) {
rack->r_ctl.fsb.tcp_ip_hdr_len += sizeof(struct udphdr);
udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
udp->uh_sport = htons(V_tcp_udp_tunneling_port);
udp->uh_dport = tp->t_port;
rack->r_ctl.fsb.udp = udp;
rack->r_ctl.fsb.th = (struct tcphdr *)(udp + 1);
} else
{
rack->r_ctl.fsb.udp = NULL;
rack->r_ctl.fsb.th = (struct tcphdr *)(ip + 1);
}
tcpip_fillheaders(rack->rc_inp,
tp->t_port,
ip, rack->r_ctl.fsb.th);
rack->r_ctl.fsb.hoplimit = tptoinpcb(tp)->inp_ip_ttl;
}
#endif
rack->r_ctl.fsb.recwin = lmin(lmax(sbspace(&tptosocket(tp)->so_rcv), 0),
(long)TCP_MAXWIN << tp->rcv_scale);
rack->r_fsb_inited = 1;
}
static int
rack_init_fsb(struct tcpcb *tp, struct tcp_rack *rack)
{
#ifdef INET6
rack->r_ctl.fsb.tcp_ip_hdr_len = sizeof(struct ip6_hdr) + sizeof(struct tcphdr) + sizeof(struct udphdr);
#else
rack->r_ctl.fsb.tcp_ip_hdr_len = sizeof(struct tcpiphdr) + sizeof(struct udphdr);
#endif
rack->r_ctl.fsb.tcp_ip_hdr = malloc(rack->r_ctl.fsb.tcp_ip_hdr_len,
M_TCPFSB, M_NOWAIT|M_ZERO);
if (rack->r_ctl.fsb.tcp_ip_hdr == NULL) {
return (ENOMEM);
}
rack->r_fsb_inited = 0;
return (0);
}
static void
rack_log_hystart_event(struct tcp_rack *rack, uint32_t high_seq, uint8_t mod)
{
struct tcpcb *tp;
tp = rack->rc_tp;
if (tcp_bblogging_on(tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = rack->r_ctl.current_round;
log.u_bbr.flex2 = rack->r_ctl.roundends;
log.u_bbr.flex3 = high_seq;
log.u_bbr.flex4 = tp->snd_max;
log.u_bbr.flex8 = mod;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.cur_del_rate = rack->rc_tp->t_sndbytes;
log.u_bbr.delRate = rack->rc_tp->t_snd_rxt_bytes;
TCP_LOG_EVENTP(tp, NULL,
&tptosocket(tp)->so_rcv,
&tptosocket(tp)->so_snd,
TCP_HYSTART, 0,
0, &log, false, &tv);
}
}
static void
rack_deferred_init(struct tcpcb *tp, struct tcp_rack *rack)
{
rack->rack_deferred_inited = 1;
rack->r_ctl.roundends = tp->snd_max;
rack->r_ctl.rc_high_rwnd = tp->snd_wnd;
rack->r_ctl.cwnd_to_use = tp->snd_cwnd;
}
static void
rack_init_retransmit_value(struct tcp_rack *rack, int ctl)
{
if (ctl == 1) {
rack->full_size_rxt = 1;
rack->shape_rxt_to_pacing_min = 0;
} else if (ctl == 2) {
rack->full_size_rxt = 0;
rack->shape_rxt_to_pacing_min = 1;
} else {
rack->full_size_rxt = 0;
rack->shape_rxt_to_pacing_min = 0;
}
}
static void
rack_log_chg_info(struct tcpcb *tp, struct tcp_rack *rack, uint8_t mod,
uint32_t flex1,
uint32_t flex2,
uint32_t flex3)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.flex8 = mod;
log.u_bbr.flex1 = flex1;
log.u_bbr.flex2 = flex2;
log.u_bbr.flex3 = flex3;
tcp_log_event(tp, NULL, NULL, NULL, TCP_CHG_QUERY, 0,
0, &log, false, NULL, __func__, __LINE__, &tv);
}
}
static int
rack_chg_query(struct tcpcb *tp, struct tcp_query_resp *reqr)
{
struct tcp_rack *rack;
struct rack_sendmap *rsm;
int i;
rack = (struct tcp_rack *)tp->t_fb_ptr;
switch (reqr->req) {
case TCP_QUERY_SENDMAP:
if ((reqr->req_param == tp->snd_max) ||
(tp->snd_max == tp->snd_una)){
return (0);
}
rsm = tqhash_find(rack->r_ctl.tqh, reqr->req_param);
if (rsm == NULL) {
return (0);
}
reqr->sendmap_start = rsm->r_start;
reqr->sendmap_end = rsm->r_end;
reqr->sendmap_send_cnt = rsm->r_rtr_cnt;
reqr->sendmap_fas = rsm->r_fas;
if (reqr->sendmap_send_cnt > SNDMAP_NRTX)
reqr->sendmap_send_cnt = SNDMAP_NRTX;
for(i=0; i<reqr->sendmap_send_cnt; i++)
reqr->sendmap_time[i] = rsm->r_tim_lastsent[i];
reqr->sendmap_ack_arrival = rsm->r_ack_arrival;
reqr->sendmap_flags = rsm->r_flags & SNDMAP_MASK;
reqr->sendmap_r_rtr_bytes = rsm->r_rtr_bytes;
reqr->sendmap_dupacks = rsm->r_dupack;
rack_log_chg_info(tp, rack, 1,
rsm->r_start,
rsm->r_end,
rsm->r_flags);
return(1);
break;
case TCP_QUERY_TIMERS_UP:
if (rack->r_ctl.rc_hpts_flags == 0) {
return (0);
}
reqr->timer_hpts_flags = rack->r_ctl.rc_hpts_flags;
if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
reqr->timer_pacing_to = rack->r_ctl.rc_last_output_to;
}
if (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) {
reqr->timer_timer_exp = rack->r_ctl.rc_timer_exp;
}
rack_log_chg_info(tp, rack, 2,
rack->r_ctl.rc_hpts_flags,
rack->r_ctl.rc_last_output_to,
rack->r_ctl.rc_timer_exp);
return (1);
break;
case TCP_QUERY_RACK_TIMES:
reqr->rack_num_dsacks = rack->r_ctl.num_dsack;
reqr->rack_reorder_ts = rack->r_ctl.rc_reorder_ts;
reqr->rack_rxt_last_time = rack->r_ctl.rc_tlp_rxt_last_time;
reqr->rack_min_rtt = rack->r_ctl.rc_rack_min_rtt;
reqr->rack_rtt = rack->rc_rack_rtt;
reqr->rack_tmit_time = rack->r_ctl.rc_rack_tmit_time;
reqr->rack_srtt_measured = rack->rc_srtt_measure_made;
reqr->rack_sacked = rack->r_ctl.rc_sacked;
reqr->rack_holes_rxt = rack->r_ctl.rc_holes_rxt;
reqr->rack_prr_delivered = rack->r_ctl.rc_prr_delivered;
reqr->rack_prr_recovery_fs = rack->r_ctl.rc_prr_recovery_fs;
reqr->rack_prr_sndcnt = rack->r_ctl.rc_prr_sndcnt;
reqr->rack_prr_out = rack->r_ctl.rc_prr_out;
reqr->rack_tlp_out = rack->rc_tlp_in_progress;
reqr->rack_tlp_cnt_out = rack->r_ctl.rc_tlp_cnt_out;
if (rack->rc_in_persist) {
reqr->rack_time_went_idle = rack->r_ctl.rc_went_idle_time;
reqr->rack_in_persist = 1;
} else {
reqr->rack_time_went_idle = 0;
reqr->rack_in_persist = 0;
}
if (rack->r_wanted_output)
reqr->rack_wanted_output = 1;
else
reqr->rack_wanted_output = 0;
return (1);
break;
default:
return (-EINVAL);
}
}
static void
rack_switch_failed(struct tcpcb *tp)
{
struct tcp_rack *rack;
struct timeval tv;
uint32_t cts;
uint32_t toval;
struct hpts_diag diag;
rack = (struct tcp_rack *)tp->t_fb_ptr;
tcp_change_time_units(tp, TCP_TMR_GRANULARITY_USEC);
if (rack->r_mbuf_queue || rack->rc_always_pace || rack->r_use_cmp_ack)
tp->t_flags2 |= TF2_SUPPORTS_MBUFQ;
else
tp->t_flags2 &= ~TF2_SUPPORTS_MBUFQ;
if (rack->r_use_cmp_ack && TCPS_HAVEESTABLISHED(tp->t_state))
tp->t_flags2 |= TF2_MBUF_ACKCMP;
if (tp->t_in_hpts > IHPTS_NONE) {
return;
}
cts = tcp_get_usecs(&tv);
if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
if (TSTMP_GT(rack->r_ctl.rc_last_output_to, cts)) {
toval = rack->r_ctl.rc_last_output_to - cts;
} else {
toval = HPTS_USECS_PER_SLOT;
}
} else if (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) {
if (TSTMP_GT(rack->r_ctl.rc_timer_exp, cts)) {
toval = rack->r_ctl.rc_timer_exp - cts;
} else {
toval = HPTS_USECS_PER_SLOT;
}
} else
toval = HPTS_USECS_PER_SLOT;
tcp_hpts_insert(tp, toval, &diag);
rack_log_hpts_diag(rack, cts, &diag, &tv);
}
static int
rack_init_outstanding(struct tcpcb *tp, struct tcp_rack *rack, uint32_t us_cts, void *ptr)
{
struct rack_sendmap *rsm, *ersm;
int insret __diagused;
if (tp->t_fb->tfb_chg_query == NULL) {
rsm = rack_alloc(rack);
if (rsm == NULL) {
uma_zfree(rack_pcb_zone, ptr);
return (ENOMEM);
}
rsm->r_no_rtt_allowed = 1;
rsm->r_tim_lastsent[0] = rack_to_usec_ts(&rack->r_ctl.act_rcv_time);
rsm->r_rtr_cnt = 1;
rsm->r_rtr_bytes = 0;
if (tp->t_flags & TF_SENTFIN)
rsm->r_flags |= RACK_HAS_FIN;
rsm->r_end = tp->snd_max;
if (tp->snd_una == tp->iss) {
rsm->r_flags |= RACK_HAS_SYN;
rsm->r_start = tp->iss;
rsm->r_end = rsm->r_start + (tp->snd_max - tp->snd_una);
} else
rsm->r_start = tp->snd_una;
rsm->r_dupack = 0;
if (rack->rc_inp->inp_socket->so_snd.sb_mb != NULL) {
rsm->m = sbsndmbuf(&rack->rc_inp->inp_socket->so_snd, 0, &rsm->soff);
if (rsm->m) {
rsm->orig_m_len = rsm->m->m_len;
rsm->orig_t_space = M_TRAILINGROOM(rsm->m);
} else {
rsm->orig_m_len = 0;
rsm->orig_t_space = 0;
}
} else {
rsm->m = NULL;
rsm->orig_m_len = 0;
rsm->orig_t_space = 0;
rsm->soff = 0;
}
#ifdef INVARIANTS
if ((insret = tqhash_insert(rack->r_ctl.tqh, rsm)) != 0) {
panic("Insert in tailq_hash fails ret:%d rack:%p rsm:%p",
insret, rack, rsm);
}
#else
(void)tqhash_insert(rack->r_ctl.tqh, rsm);
#endif
TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 1;
} else {
struct tcp_query_resp qr;
int i;
tcp_seq at;
at = tp->snd_una;
while (at != tp->snd_max) {
memset(&qr, 0, sizeof(qr));
qr.req = TCP_QUERY_SENDMAP;
qr.req_param = at;
if ((*tp->t_fb->tfb_chg_query)(tp, &qr) == 0)
break;
at = qr.sendmap_end;
rsm = rack_alloc(rack);
if (rsm == NULL) {
uma_zfree(rack_pcb_zone, ptr);
return (ENOMEM);
}
memset(rsm, 0, sizeof(struct rack_sendmap));
rsm->r_dupack = qr.sendmap_dupacks;
rsm->r_start = qr.sendmap_start;
rsm->r_end = qr.sendmap_end;
if (qr.sendmap_fas)
rsm->r_fas = qr.sendmap_end;
else
rsm->r_fas = rsm->r_start - tp->snd_una;
rsm->r_flags = qr.sendmap_flags & SNDMAP_MASK;
rsm->r_rtr_bytes = qr.sendmap_r_rtr_bytes;
rsm->r_rtr_cnt = qr.sendmap_send_cnt;
rsm->r_ack_arrival = qr.sendmap_ack_arrival;
for (i=0 ; i<rsm->r_rtr_cnt; i++)
rsm->r_tim_lastsent[i] = qr.sendmap_time[i];
rsm->m = sbsndmbuf(&rack->rc_inp->inp_socket->so_snd,
(rsm->r_start - tp->snd_una), &rsm->soff);
if (rsm->m) {
rsm->orig_m_len = rsm->m->m_len;
rsm->orig_t_space = M_TRAILINGROOM(rsm->m);
} else {
rsm->orig_m_len = 0;
rsm->orig_t_space = 0;
}
#ifdef INVARIANTS
if ((insret = tqhash_insert(rack->r_ctl.tqh, rsm)) != 0) {
panic("Insert in tailq_hash fails ret:%d rack:%p rsm:%p",
insret, rack, rsm);
}
#else
(void)tqhash_insert(rack->r_ctl.tqh, rsm);
#endif
if ((rsm->r_flags & RACK_ACKED) == 0) {
TAILQ_FOREACH(ersm, &rack->r_ctl.rc_tmap, r_tnext) {
if (ersm->r_tim_lastsent[(ersm->r_rtr_cnt-1)] >
rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)]) {
rsm->r_in_tmap = 1;
TAILQ_INSERT_BEFORE(ersm, rsm, r_tnext);
break;
}
}
if (rsm->r_in_tmap == 0) {
TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 1;
}
} else {
if ((rack->r_ctl.rc_sacklast == NULL) ||
(SEQ_GT(rsm->r_end, rack->r_ctl.rc_sacklast->r_end))) {
rack->r_ctl.rc_sacklast = rsm;
}
}
rack_log_chg_info(tp, rack, 3,
rsm->r_start,
rsm->r_end,
rsm->r_flags);
}
}
return (0);
}
static int32_t
rack_init(struct tcpcb *tp, void **ptr)
{
struct inpcb *inp = tptoinpcb(tp);
struct tcp_rack *rack = NULL;
uint32_t iwin, snt, us_cts;
size_t sz;
int err, no_query;
tcp_hpts_init(tp);
if (ptr == &tp->t_fb_ptr)
no_query = 1;
else
no_query = 0;
*ptr = uma_zalloc(rack_pcb_zone, M_NOWAIT);
if (*ptr == NULL) {
return(ENOMEM);
}
memset(*ptr, 0, sizeof(struct tcp_rack));
rack = (struct tcp_rack *)*ptr;
rack->r_ctl.tqh = malloc(sizeof(struct tailq_hash), M_TCPFSB, M_NOWAIT);
if (rack->r_ctl.tqh == NULL) {
uma_zfree(rack_pcb_zone, rack);
return(ENOMEM);
}
tqhash_init(rack->r_ctl.tqh);
TAILQ_INIT(&rack->r_ctl.rc_free);
TAILQ_INIT(&rack->r_ctl.rc_tmap);
rack->rc_tp = tp;
rack->rc_inp = inp;
rack->r_is_v6 = (inp->inp_vflag & INP_IPV6) != 0;
rack_clear_rate_sample(rack);
rack->rc_new_rnd_needed = 1;
rack->r_ctl.rc_split_limit = V_tcp_map_split_limit;
rack->r_ctl.rc_reorder_fade = rack_reorder_fade;
rack->rc_allow_data_af_clo = rack_ignore_data_after_close;
rack->r_ctl.rc_tlp_threshold = rack_tlp_thresh;
if (rack_fill_cw_state)
rack->rc_pace_to_cwnd = 1;
if (rack_pacing_min_seg)
rack->r_ctl.rc_user_set_min_segs = rack_pacing_min_seg;
if (use_rack_rr)
rack->use_rack_rr = 1;
if (rack_dnd_default) {
rack->rc_pace_dnd = 1;
}
if (V_tcp_delack_enabled)
tp->t_delayed_ack = 1;
else
tp->t_delayed_ack = 0;
#ifdef TCP_ACCOUNTING
if (rack_tcp_accounting) {
tp->t_flags2 |= TF2_TCP_ACCOUNTING;
}
#endif
rack->r_ctl.pcm_i.cnt_alloc = RACK_DEFAULT_PCM_ARRAY;
sz = (sizeof(struct rack_pcm_stats) * rack->r_ctl.pcm_i.cnt_alloc);
rack->r_ctl.pcm_s = malloc(sz,M_TCPPCM, M_NOWAIT);
if (rack->r_ctl.pcm_s == NULL) {
rack->r_ctl.pcm_i.cnt_alloc = 0;
}
rack->r_ctl.rack_per_upper_bound_ss = (uint8_t)rack_per_upper_bound_ss;
rack->r_ctl.rack_per_upper_bound_ca = (uint8_t)rack_per_upper_bound_ca;
if (rack_enable_shared_cwnd)
rack->rack_enable_scwnd = 1;
rack->r_ctl.pace_len_divisor = rack_default_pacing_divisor;
rack->rc_user_set_max_segs = rack_hptsi_segments;
rack->r_ctl.max_reduction = rack_max_reduce;
rack->rc_force_max_seg = 0;
TAILQ_INIT(&rack->r_ctl.opt_list);
rack->r_ctl.rc_saved_beta = V_newreno_beta_ecn;
rack->r_ctl.rc_saved_beta_ecn = V_newreno_beta_ecn;
if (rack_hibeta_setting) {
rack->rack_hibeta = 1;
if ((rack_hibeta_setting >= 50) &&
(rack_hibeta_setting <= 100)) {
rack->r_ctl.rc_saved_beta = rack_hibeta_setting;
rack->r_ctl.saved_hibeta = rack_hibeta_setting;
}
} else {
rack->r_ctl.saved_hibeta = 50;
}
rack->r_ctl.last_tm_mark = 0xffffffffffffffff;
rack->r_ctl.rc_reorder_shift = rack_reorder_thresh;
rack->r_ctl.rc_pkt_delay = rack_pkt_delay;
rack->r_ctl.rc_tlp_cwnd_reduce = rack_lower_cwnd_at_tlp;
rack->r_ctl.rc_lowest_us_rtt = 0xffffffff;
rack->r_ctl.rc_highest_us_rtt = 0;
rack->r_ctl.bw_rate_cap = rack_bw_rate_cap;
rack->pcm_enabled = rack_pcm_is_enabled;
if (rack_fillcw_bw_cap)
rack->r_ctl.fillcw_cap = rack_fillcw_bw_cap;
rack->r_ctl.timer_slop = TICKS_2_USEC(tcp_rexmit_slop);
if (rack_use_cmp_acks)
rack->r_use_cmp_ack = 1;
if (rack_disable_prr)
rack->rack_no_prr = 1;
if (rack_gp_no_rec_chg)
rack->rc_gp_no_rec_chg = 1;
if (rack_pace_every_seg && tcp_can_enable_pacing()) {
rack->r_ctl.pacing_method |= RACK_REG_PACING;
rack->rc_always_pace = 1;
if (rack->rack_hibeta)
rack_set_cc_pacing(rack);
} else
rack->rc_always_pace = 0;
if (rack_enable_mqueue_for_nonpaced || rack->r_use_cmp_ack)
rack->r_mbuf_queue = 1;
else
rack->r_mbuf_queue = 0;
rack_set_pace_segments(tp, rack, __LINE__, NULL);
if (rack_limits_scwnd)
rack->r_limit_scw = 1;
else
rack->r_limit_scw = 0;
rack_init_retransmit_value(rack, rack_rxt_controls);
rack->rc_labc = V_tcp_abc_l_var;
if (rack_honors_hpts_min_to)
rack->r_use_hpts_min = 1;
if (tp->snd_una != 0) {
rack->rc_sendvars_notset = 0;
tcp_timer_stop(tp);
} else {
rack->rc_sendvars_notset = 1;
}
rack->r_ctl.rc_rate_sample_method = rack_rate_sample_method;
rack->rack_tlp_threshold_use = rack_tlp_threshold_use;
rack->r_ctl.rc_prr_sendalot = rack_send_a_lot_in_prr;
rack->r_ctl.rc_min_to = rack_min_to;
microuptime(&rack->r_ctl.act_rcv_time);
rack->r_ctl.rack_per_of_gp_ss = rack_per_of_gp_ss;
if (rack_hw_up_only)
rack->r_up_only = 1;
if (rack_do_dyn_mul) {
rack->rc_gp_dyn_mul = 1;
if (rack_do_dyn_mul >= 100)
rack->r_ctl.rack_per_of_gp_ca = rack_do_dyn_mul;
} else
rack->r_ctl.rack_per_of_gp_ca = rack_per_of_gp_ca;
rack->r_ctl.rack_per_of_gp_rec = rack_per_of_gp_rec;
if (rack_timely_off) {
rack->rc_skip_timely = 1;
}
if (rack->rc_skip_timely) {
rack->r_ctl.rack_per_of_gp_rec = 90;
rack->r_ctl.rack_per_of_gp_ca = 100;
rack->r_ctl.rack_per_of_gp_ss = 250;
}
rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt;
rack->r_ctl.rc_tlp_rxt_last_time = tcp_tv_to_msec(&rack->r_ctl.act_rcv_time);
rack->r_ctl.last_rcv_tstmp_for_rtt = tcp_tv_to_msec(&rack->r_ctl.act_rcv_time);
setup_time_filter_small(&rack->r_ctl.rc_gp_min_rtt, FILTER_TYPE_MIN,
rack_probertt_filter_life);
us_cts = tcp_tv_to_usec(&rack->r_ctl.act_rcv_time);
rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
rack->r_ctl.rc_time_of_last_probertt = us_cts;
rack->r_ctl.rc_went_idle_time = us_cts;
rack->r_ctl.rc_time_probertt_starts = 0;
rack->r_ctl.gp_rnd_thresh = rack_rnd_cnt_req & 0xff;
if (rack_rnd_cnt_req & 0x10000)
rack->r_ctl.gate_to_fs = 1;
rack->r_ctl.gp_gain_req = rack_gp_gain_req;
if ((rack_rnd_cnt_req & 0x100) > 0) {
}
if (rack_dsack_std_based & 0x1) {
rack->rc_rack_tmr_std_based = 1;
}
if (rack_dsack_std_based & 0x2) {
rack->rc_rack_use_dsack = 1;
}
if (rack_req_measurements)
rack->r_ctl.req_measurements = rack_req_measurements;
else
rack->r_ctl.req_measurements = 1;
if (rack_enable_hw_pacing)
rack->rack_hdw_pace_ena = 1;
if (rack_hw_rate_caps)
rack->r_rack_hw_rate_caps = 1;
if (rack_non_rxt_use_cr)
rack->rack_rec_nonrxt_use_cr = 1;
err = rack_init_fsb(tp, rack);
if (err) {
uma_zfree(rack_pcb_zone, *ptr);
*ptr = NULL;
return (err);
}
if (rack_do_hystart) {
tp->t_ccv.flags |= CCF_HYSTART_ALLOWED;
if (rack_do_hystart > 1)
tp->t_ccv.flags |= CCF_HYSTART_CAN_SH_CWND;
if (rack_do_hystart > 2)
tp->t_ccv.flags |= CCF_HYSTART_CONS_SSTH;
}
rack_log_chg_info(tp, rack, 7,
no_query, 0, 0);
if (rack_def_profile)
rack_set_profile(rack, rack_def_profile);
tp->t_flags &= ~TF_GPUTINPROG;
if ((tp->t_state != TCPS_CLOSED) &&
(tp->t_state != TCPS_TIME_WAIT)) {
if (SEQ_GT(tp->snd_max, tp->iss))
snt = tp->snd_max - tp->iss;
else
snt = 0;
iwin = rc_init_window(rack);
if ((snt < iwin) &&
(no_query == 1)) {
if (tp->snd_cwnd < iwin)
tp->snd_cwnd = iwin;
tp->snd_ssthresh = 0xffffffff;
}
rack_deferred_init(tp, rack);
}
if ((tp->t_state != TCPS_CLOSED) &&
(tp->t_state != TCPS_TIME_WAIT) &&
(no_query == 0) &&
(tp->snd_una != tp->snd_max)) {
err = rack_init_outstanding(tp, rack, us_cts, *ptr);
if (err) {
*ptr = NULL;
return(err);
}
}
rack_stop_all_timers(tp, rack);
if (rack->r_mbuf_queue || rack->rc_always_pace || rack->r_use_cmp_ack)
tp->t_flags2 |= TF2_SUPPORTS_MBUFQ;
else
tp->t_flags2 &= ~TF2_SUPPORTS_MBUFQ;
if (rack->r_use_cmp_ack && TCPS_HAVEESTABLISHED(tp->t_state))
tp->t_flags2 |= TF2_MBUF_ACKCMP;
rack_convert_rtts(tp);
rack_log_hystart_event(rack, rack->r_ctl.roundends, 20);
if ((tp->t_flags & TF_DISCONNECTED) == 0) {
if (tp->t_fb->tfb_chg_query == NULL) {
rack_start_hpts_timer(rack, tp, tcp_get_usecs(NULL), 0, 0, 0);
} else {
struct tcp_query_resp qr;
int ret;
memset(&qr, 0, sizeof(qr));
qr.req = TCP_QUERY_RACK_TIMES;
ret = (*tp->t_fb->tfb_chg_query)(tp, &qr);
if (ret == 1) {
rack->r_ctl.rc_reorder_ts = qr.rack_reorder_ts;
rack->r_ctl.num_dsack = qr.rack_num_dsacks;
rack->r_ctl.rc_tlp_rxt_last_time = qr.rack_rxt_last_time;
rack->r_ctl.rc_rack_min_rtt = qr.rack_min_rtt;
rack->rc_rack_rtt = qr.rack_rtt;
rack->r_ctl.rc_rack_tmit_time = qr.rack_tmit_time;
rack->r_ctl.rc_sacked = qr.rack_sacked;
rack->r_ctl.rc_holes_rxt = qr.rack_holes_rxt;
rack->r_ctl.rc_prr_delivered = qr.rack_prr_delivered;
rack->r_ctl.rc_prr_recovery_fs = qr.rack_prr_recovery_fs;
rack->r_ctl.rc_prr_sndcnt = qr.rack_prr_sndcnt;
rack->r_ctl.rc_prr_out = qr.rack_prr_out;
if (qr.rack_tlp_out) {
rack->rc_tlp_in_progress = 1;
rack->r_ctl.rc_tlp_cnt_out = qr.rack_tlp_cnt_out;
} else {
rack->rc_tlp_in_progress = 0;
rack->r_ctl.rc_tlp_cnt_out = 0;
}
if (qr.rack_srtt_measured)
rack->rc_srtt_measure_made = 1;
if (qr.rack_in_persist == 1) {
rack->r_ctl.rc_went_idle_time = qr.rack_time_went_idle;
#ifdef NETFLIX_SHARED_CWND
if (rack->r_ctl.rc_scw) {
tcp_shared_cwnd_idle(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
rack->rack_scwnd_is_idle = 1;
}
#endif
rack->r_ctl.persist_lost_ends = 0;
rack->probe_not_answered = 0;
rack->forced_ack = 0;
tp->t_rxtshift = 0;
rack->rc_in_persist = 1;
RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
}
if (qr.rack_wanted_output)
rack->r_wanted_output = 1;
rack_log_chg_info(tp, rack, 6,
qr.rack_min_rtt,
qr.rack_rtt,
qr.rack_reorder_ts);
}
qr.req_param = 0;
qr.req = TCP_QUERY_TIMERS_UP;
ret = (*tp->t_fb->tfb_chg_query)(tp, &qr);
if (ret) {
uint32_t tov = 0;
rack->r_ctl.rc_hpts_flags = qr.timer_hpts_flags;
if (qr.timer_hpts_flags & PACE_PKT_OUTPUT) {
rack->r_ctl.rc_last_output_to = qr.timer_pacing_to;
if (TSTMP_GT(qr.timer_pacing_to, us_cts))
tov = qr.timer_pacing_to - us_cts;
else
tov = HPTS_USECS_PER_SLOT;
}
if (qr.timer_hpts_flags & PACE_TMR_MASK) {
rack->r_ctl.rc_timer_exp = qr.timer_timer_exp;
if (tov == 0) {
if (TSTMP_GT(qr.timer_timer_exp, us_cts))
tov = qr.timer_timer_exp - us_cts;
else
tov = HPTS_USECS_PER_SLOT;
}
}
rack_log_chg_info(tp, rack, 4,
rack->r_ctl.rc_hpts_flags,
rack->r_ctl.rc_last_output_to,
rack->r_ctl.rc_timer_exp);
if (tov) {
struct hpts_diag diag;
tcp_hpts_insert(tp, tov, &diag);
rack_log_hpts_diag(rack, us_cts, &diag, &rack->r_ctl.act_rcv_time);
}
}
}
rack_log_rtt_shrinks(rack, us_cts, tp->t_rxtcur,
__LINE__, RACK_RTTS_INIT);
}
return (0);
}
static int
rack_handoff_ok(struct tcpcb *tp)
{
if ((tp->t_state == TCPS_CLOSED) ||
(tp->t_state == TCPS_LISTEN)) {
return (0);
}
if ((tp->t_state == TCPS_SYN_SENT) ||
(tp->t_state == TCPS_SYN_RECEIVED)) {
return (EAGAIN);
}
if ((tp->t_flags & TF_SENTFIN) && ((tp->snd_max - tp->snd_una) > 1)) {
return (EAGAIN);
}
if ((tp->t_flags & TF_SACK_PERMIT) || rack_sack_not_required){
return (0);
}
return (EINVAL);
}
static void
rack_fini(struct tcpcb *tp, int32_t tcb_is_purged)
{
if (tp->t_fb_ptr) {
uint32_t cnt_free = 0;
struct tcp_rack *rack;
struct rack_sendmap *rsm;
tcp_handle_orphaned_packets(tp);
tp->t_flags &= ~TF_FORCEDATA;
rack = (struct tcp_rack *)tp->t_fb_ptr;
rack_log_pacing_delay_calc(rack,
0,
0,
0,
rack_get_gp_est(rack),
rack_get_lt_bw(rack),
20, __LINE__, NULL, 0);
#ifdef NETFLIX_SHARED_CWND
if (rack->r_ctl.rc_scw) {
uint32_t limit;
if (rack->r_limit_scw)
limit = max(1, rack->r_ctl.rc_lowest_us_rtt);
else
limit = 0;
tcp_shared_cwnd_free_full(tp, rack->r_ctl.rc_scw,
rack->r_ctl.rc_scw_index,
limit);
rack->r_ctl.rc_scw = NULL;
}
#endif
if (rack->r_ctl.fsb.tcp_ip_hdr) {
free(rack->r_ctl.fsb.tcp_ip_hdr, M_TCPFSB);
rack->r_ctl.fsb.tcp_ip_hdr = NULL;
rack->r_ctl.fsb.th = NULL;
}
if (rack->rc_always_pace == 1) {
rack_remove_pacing(rack);
}
while (!TAILQ_EMPTY(&rack->r_ctl.opt_list)) {
struct deferred_opt_list *dol;
dol = TAILQ_FIRST(&rack->r_ctl.opt_list);
TAILQ_REMOVE(&rack->r_ctl.opt_list, dol, next);
free(dol, M_TCPDO);
}
if (rack->r_ctl.crte != NULL) {
tcp_rel_pacing_rate(rack->r_ctl.crte, tp);
rack->rack_hdrw_pacing = 0;
rack->r_ctl.crte = NULL;
}
#ifdef TCP_BLACKBOX
tcp_log_flowend(tp);
#endif
rsm = tqhash_min(rack->r_ctl.tqh);
while (rsm) {
tqhash_remove(rack->r_ctl.tqh, rsm, REMOVE_TYPE_CUMACK);
rack->r_ctl.rc_num_maps_alloced--;
uma_zfree(rack_zone, rsm);
rsm = tqhash_min(rack->r_ctl.tqh);
}
rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
while (rsm) {
TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext);
rack->r_ctl.rc_num_maps_alloced--;
rack->rc_free_cnt--;
cnt_free++;
uma_zfree(rack_zone, rsm);
rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
}
if (rack->r_ctl.pcm_s != NULL) {
free(rack->r_ctl.pcm_s, M_TCPPCM);
rack->r_ctl.pcm_s = NULL;
rack->r_ctl.pcm_i.cnt_alloc = 0;
rack->r_ctl.pcm_i.cnt = 0;
}
if ((rack->r_ctl.rc_num_maps_alloced > 0) &&
(tcp_bblogging_on(tp))) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex8 = 10;
log.u_bbr.flex1 = rack->r_ctl.rc_num_maps_alloced;
log.u_bbr.flex2 = rack->rc_free_cnt;
log.u_bbr.flex3 = cnt_free;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
rsm = tqhash_min(rack->r_ctl.tqh);
log.u_bbr.delRate = (uintptr_t)rsm;
rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
log.u_bbr.cur_del_rate = (uintptr_t)rsm;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.pkt_epoch = __LINE__;
(void)tcp_log_event(tp, NULL, NULL, NULL, TCP_LOG_OUT, ERRNO_UNK,
0, &log, false, NULL, NULL, 0, &tv);
}
KASSERT((rack->r_ctl.rc_num_maps_alloced == 0),
("rack:%p num_aloc:%u after freeing all?",
rack,
rack->r_ctl.rc_num_maps_alloced));
rack->rc_free_cnt = 0;
free(rack->r_ctl.tqh, M_TCPFSB);
rack->r_ctl.tqh = NULL;
uma_zfree(rack_pcb_zone, tp->t_fb_ptr);
tp->t_fb_ptr = NULL;
}
tp->snd_nxt = tp->snd_max;
}
static void
rack_set_state(struct tcpcb *tp, struct tcp_rack *rack)
{
if ((rack->r_state == TCPS_CLOSED) && (tp->t_state != TCPS_CLOSED)) {
rack->r_is_v6 = (tptoinpcb(tp)->inp_vflag & INP_IPV6) != 0;
}
switch (tp->t_state) {
case TCPS_SYN_SENT:
rack->r_state = TCPS_SYN_SENT;
rack->r_substate = rack_do_syn_sent;
break;
case TCPS_SYN_RECEIVED:
rack->r_state = TCPS_SYN_RECEIVED;
rack->r_substate = rack_do_syn_recv;
break;
case TCPS_ESTABLISHED:
rack_set_pace_segments(tp, rack, __LINE__, NULL);
rack->r_state = TCPS_ESTABLISHED;
rack->r_substate = rack_do_established;
break;
case TCPS_CLOSE_WAIT:
rack->r_state = TCPS_CLOSE_WAIT;
rack->r_substate = rack_do_close_wait;
break;
case TCPS_FIN_WAIT_1:
rack_set_pace_segments(tp, rack, __LINE__, NULL);
rack->r_state = TCPS_FIN_WAIT_1;
rack->r_substate = rack_do_fin_wait_1;
break;
case TCPS_CLOSING:
rack_set_pace_segments(tp, rack, __LINE__, NULL);
rack->r_state = TCPS_CLOSING;
rack->r_substate = rack_do_closing;
break;
case TCPS_LAST_ACK:
rack_set_pace_segments(tp, rack, __LINE__, NULL);
rack->r_state = TCPS_LAST_ACK;
rack->r_substate = rack_do_lastack;
break;
case TCPS_FIN_WAIT_2:
rack->r_state = TCPS_FIN_WAIT_2;
rack->r_substate = rack_do_fin_wait_2;
break;
case TCPS_LISTEN:
case TCPS_CLOSED:
case TCPS_TIME_WAIT:
default:
break;
};
if (rack->r_use_cmp_ack && TCPS_HAVEESTABLISHED(tp->t_state))
rack->rc_tp->t_flags2 |= TF2_MBUF_ACKCMP;
}
static void
rack_timer_audit(struct tcpcb *tp, struct tcp_rack *rack, struct sockbuf *sb)
{
struct rack_sendmap *rsm;
int tmr_up;
tmr_up = rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK;
if (tcp_in_hpts(rack->rc_tp) == 0) {
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
rack_start_hpts_timer(rack, tp, tcp_get_usecs(NULL), 0, 0, 0);
return;
}
if (rack->rc_in_persist && (tmr_up == PACE_TMR_PERSIT))
return;
rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
if (((rsm == NULL) || (tp->t_state < TCPS_ESTABLISHED)) &&
(tmr_up == PACE_TMR_RXT)) {
return;
}
if (rsm == NULL) {
if (tp->t_flags & TF_DELACK) {
if (tmr_up == PACE_TMR_DELACK)
return;
} else if (((V_tcp_always_keepalive ||
rack->rc_inp->inp_socket->so_options & SO_KEEPALIVE) &&
(tp->t_state <= TCPS_CLOSING)) &&
(tmr_up == PACE_TMR_KEEP) &&
(tp->snd_max == tp->snd_una)) {
return;
}
}
if (SEQ_GT(tp->snd_max, tp->snd_una) &&
((tmr_up == PACE_TMR_TLP) ||
(tmr_up == PACE_TMR_RACK) ||
(tmr_up == PACE_TMR_RXT))) {
return;
} else if (tmr_up == PACE_TMR_DELACK) {
return;
}
if (tcp_in_hpts(rack->rc_tp)) {
if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
uint32_t us_cts;
us_cts = tcp_get_usecs(NULL);
if (TSTMP_GT(rack->r_ctl.rc_last_output_to, us_cts)) {
rack->r_early = 1;
rack->r_ctl.rc_agg_early += (rack->r_ctl.rc_last_output_to - us_cts);
}
rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
}
tcp_hpts_remove(rack->rc_tp);
}
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
rack_start_hpts_timer(rack, tp, tcp_get_usecs(NULL), 0, 0, 0);
}
static void
rack_do_win_updates(struct tcpcb *tp, struct tcp_rack *rack, uint32_t tiwin, uint32_t seq, uint32_t ack, uint32_t cts)
{
if ((SEQ_LT(tp->snd_wl1, seq) ||
(tp->snd_wl1 == seq && (SEQ_LT(tp->snd_wl2, ack) ||
(tp->snd_wl2 == ack && tiwin > tp->snd_wnd))))) {
if ((tp->snd_wl2 == ack) && (tiwin > tp->snd_wnd))
KMOD_TCPSTAT_INC(tcps_rcvwinupd);
tp->snd_wnd = tiwin;
rack_validate_fo_sendwin_up(tp, rack);
tp->snd_wl1 = seq;
tp->snd_wl2 = ack;
if (tp->snd_wnd > tp->max_sndwnd)
tp->max_sndwnd = tp->snd_wnd;
rack->r_wanted_output = 1;
} else if ((tp->snd_wl2 == ack) && (tiwin < tp->snd_wnd)) {
tp->snd_wnd = tiwin;
rack_validate_fo_sendwin_up(tp, rack);
tp->snd_wl1 = seq;
tp->snd_wl2 = ack;
} else {
return;
}
if (tp->snd_wnd > tp->max_sndwnd)
tp->max_sndwnd = tp->snd_wnd;
if ((rack->rc_in_persist != 0) &&
(tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2),
rack->r_ctl.rc_pace_min_segs))) {
rack_exit_persist(tp, rack, cts);
}
if ((rack->rc_in_persist == 0) &&
(tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) &&
TCPS_HAVEESTABLISHED(tp->t_state) &&
((tp->snd_max == tp->snd_una) || rack->rc_has_collapsed) &&
sbavail(&tptosocket(tp)->so_snd) &&
(sbavail(&tptosocket(tp)->so_snd) > tp->snd_wnd)) {
rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime, ack);
}
}
static void
rack_log_input_packet(struct tcpcb *tp, struct tcp_rack *rack, struct tcp_ackent *ae, int ackval, uint32_t high_seq)
{
if (tcp_bblogging_on(rack->rc_tp)) {
struct inpcb *inp = tptoinpcb(tp);
union tcp_log_stackspecific log;
struct timeval ltv;
char tcp_hdr_buf[60];
struct tcphdr *th;
struct timespec ts;
uint32_t orig_snd_una;
uint8_t xx = 0;
#ifdef TCP_REQUEST_TRK
struct tcp_sendfile_track *tcp_req;
if (SEQ_GT(ae->ack, tp->snd_una)) {
tcp_req = tcp_req_find_req_for_seq(tp, (ae->ack-1));
} else {
tcp_req = tcp_req_find_req_for_seq(tp, ae->ack);
}
#endif
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
if (rack->rack_no_prr == 0)
log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
else
log.u_bbr.flex1 = 0;
log.u_bbr.use_lt_bw = rack->r_ent_rec_ns;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->r_might_revert;
log.u_bbr.flex2 = rack->r_ctl.rc_num_maps_alloced;
log.u_bbr.bbr_state = rack->rc_free_cnt;
log.u_bbr.inflight = ctf_flight_size(tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkts_out = tp->t_maxseg;
log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
log.u_bbr.flex7 = 1;
log.u_bbr.lost = ae->flags;
log.u_bbr.cwnd_gain = ackval;
log.u_bbr.pacing_gain = 0x2;
if (ae->flags & TSTMP_HDWR) {
log.u_bbr.flex3 = M_TSTMP;
ts.tv_sec = ae->timestamp / 1000000000;
ts.tv_nsec = ae->timestamp % 1000000000;
ltv.tv_sec = ts.tv_sec;
ltv.tv_usec = ts.tv_nsec / 1000;
log.u_bbr.lt_epoch = tcp_tv_to_usec(<v);
} else if (ae->flags & TSTMP_LRO) {
log.u_bbr.flex3 = M_TSTMP_LRO;
ts.tv_sec = ae->timestamp / 1000000000;
ts.tv_nsec = ae->timestamp % 1000000000;
ltv.tv_sec = ts.tv_sec;
ltv.tv_usec = ts.tv_nsec / 1000;
log.u_bbr.flex5 = tcp_tv_to_usec(<v);
}
log.u_bbr.timeStamp = tcp_get_usecs(<v);
log.u_bbr.delRate = ae->timestamp;
#ifdef TCP_REQUEST_TRK
log.u_bbr.applimited = tp->t_tcpreq_closed;
log.u_bbr.applimited <<= 8;
log.u_bbr.applimited |= tp->t_tcpreq_open;
log.u_bbr.applimited <<= 8;
log.u_bbr.applimited |= tp->t_tcpreq_req;
if (tcp_req) {
log.u_bbr.pkt_epoch = (tcp_req->localtime / HPTS_USEC_IN_SEC);
log.u_bbr.delivered = (tcp_req->localtime % HPTS_USEC_IN_SEC);
log.u_bbr.rttProp = tcp_req->timestamp;
log.u_bbr.cur_del_rate = tcp_req->start;
if (tcp_req->flags & TCP_TRK_TRACK_FLG_OPEN) {
log.u_bbr.flex8 |= 1;
} else {
log.u_bbr.flex8 |= 2;
log.u_bbr.bw_inuse = tcp_req->end;
}
log.u_bbr.flex6 = tcp_req->start_seq;
if (tcp_req->flags & TCP_TRK_TRACK_FLG_COMP) {
log.u_bbr.flex8 |= 4;
log.u_bbr.epoch = tcp_req->end_seq;
}
}
#endif
memset(tcp_hdr_buf, 0, sizeof(tcp_hdr_buf));
th = (struct tcphdr *)tcp_hdr_buf;
th->th_seq = ae->seq;
th->th_ack = ae->ack;
th->th_win = ae->win;
th->th_sport = inp->inp_fport;
th->th_dport = inp->inp_lport;
tcp_set_flags(th, ae->flags);
if (ae->flags & HAS_TSTMP) {
u_char *cp;
uint32_t val;
th->th_off = ((sizeof(struct tcphdr) + TCPOLEN_TSTAMP_APPA) >> 2);
cp = (u_char *)(th + 1);
*cp = TCPOPT_NOP;
cp++;
*cp = TCPOPT_NOP;
cp++;
*cp = TCPOPT_TIMESTAMP;
cp++;
*cp = TCPOLEN_TIMESTAMP;
cp++;
val = htonl(ae->ts_value);
bcopy((char *)&val,
(char *)cp, sizeof(uint32_t));
val = htonl(ae->ts_echo);
bcopy((char *)&val,
(char *)(cp + 4), sizeof(uint32_t));
} else
th->th_off = (sizeof(struct tcphdr) >> 2);
if (tp->snd_una != high_seq) {
orig_snd_una = tp->snd_una;
tp->snd_una = high_seq;
xx = 1;
} else
xx = 0;
TCP_LOG_EVENTP(tp, th,
&tptosocket(tp)->so_rcv,
&tptosocket(tp)->so_snd, TCP_LOG_IN, 0,
0, &log, true, <v);
if (xx) {
tp->snd_una = orig_snd_una;
}
}
}
static void
rack_handle_probe_response(struct tcp_rack *rack, uint32_t tiwin, uint32_t us_cts)
{
uint32_t us_rtt;
rack->forced_ack = 0;
rack->rc_tp->t_rxtshift = 0;
if ((rack->rc_in_persist &&
(tiwin == rack->rc_tp->snd_wnd)) ||
(rack->rc_in_persist == 0)) {
if (rack->rc_in_persist)
counter_u64_add(rack_persists_acks, 1);
us_rtt = us_cts - rack->r_ctl.forced_ack_ts;
if (us_rtt == 0)
us_rtt = 1;
if (rack->probe_not_answered == 0) {
rack_apply_updated_usrtt(rack, us_rtt, us_cts);
tcp_rack_xmit_timer(rack, us_rtt, 0, us_rtt, 3, NULL, 1);
} else {
if (rack_apply_rtt_with_reduced_conf) {
rack_apply_updated_usrtt(rack, us_rtt, us_cts);
tcp_rack_xmit_timer(rack, us_rtt, 0, us_rtt, 0, NULL, 1);
}
}
}
}
static void
rack_new_round_starts(struct tcpcb *tp, struct tcp_rack *rack, uint32_t high_seq)
{
rack->r_ctl.roundends = tp->snd_max;
rack->rc_new_rnd_needed = 0;
rack_log_hystart_event(rack, tp->snd_max, 4);
}
static void
rack_log_pcm(struct tcp_rack *rack, uint8_t mod, uint32_t flex1, uint32_t flex2,
uint32_t flex3)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
(void)tcp_get_usecs(&tv);
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_tv_to_usec(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.flex8 = mod;
log.u_bbr.flex1 = flex1;
log.u_bbr.flex2 = flex2;
log.u_bbr.flex3 = flex3;
log.u_bbr.flex4 = rack_pcm_every_n_rounds;
log.u_bbr.flex5 = rack->r_ctl.pcm_idle_rounds;
log.u_bbr.bbr_substate = rack->pcm_needed;
log.u_bbr.bbr_substate <<= 1;
log.u_bbr.bbr_substate |= rack->pcm_in_progress;
log.u_bbr.bbr_substate <<= 1;
log.u_bbr.bbr_substate |= rack->pcm_enabled;
(void)tcp_log_event(rack->rc_tp, NULL, NULL, NULL, TCP_PCM_MEASURE, ERRNO_UNK,
0, &log, false, NULL, NULL, 0, &tv);
}
}
static void
rack_new_round_setup(struct tcpcb *tp, struct tcp_rack *rack, uint32_t high_seq)
{
rack_log_hystart_event(rack, high_seq, 21);
rack->r_ctl.current_round++;
rack->rc_new_rnd_needed = 1;
if ((rack->pcm_enabled == 1) &&
(rack->pcm_needed == 0) &&
(rack->pcm_in_progress == 0)) {
int rnds;
rnds = rack->r_ctl.current_round - rack->r_ctl.last_pcm_round;
if ((rnds + rack->r_ctl.pcm_idle_rounds) >= rack_pcm_every_n_rounds) {
rack->pcm_needed = 1;
rack_log_pcm(rack, 3, rack->r_ctl.last_pcm_round, rack_pcm_every_n_rounds, rack->r_ctl.current_round );
} else if (rack_verbose_logging) {
rack_log_pcm(rack, 3, rack->r_ctl.last_pcm_round, rack_pcm_every_n_rounds, rack->r_ctl.current_round );
}
}
if (tp->t_ccv.flags & CCF_HYSTART_ALLOWED) {
if (CC_ALGO(tp)->newround != NULL) {
CC_ALGO(tp)->newround(&tp->t_ccv, rack->r_ctl.current_round);
}
}
if (rack->dgp_on &&
(rack->rc_initial_ss_comp == 0) &&
(tp->snd_cwnd < tp->snd_ssthresh) &&
(rack->r_ctl.num_measurements >= RACK_REQ_AVG) &&
(rack->r_ctl.gp_rnd_thresh > 0) &&
((rack->r_ctl.current_round - rack->r_ctl.last_rnd_of_gp_rise) >= rack->r_ctl.gp_rnd_thresh)) {
rack->rc_initial_ss_comp = 1;
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.flex1 = rack->r_ctl.current_round;
log.u_bbr.flex2 = rack->r_ctl.last_rnd_of_gp_rise;
log.u_bbr.flex3 = rack->r_ctl.gp_rnd_thresh;
log.u_bbr.flex4 = rack->r_ctl.gate_to_fs;
log.u_bbr.flex5 = rack->r_ctl.ss_hi_fs;
log.u_bbr.flex8 = 40;
(void)tcp_log_event(tp, NULL, NULL, NULL, BBR_LOG_CWND, 0,
0, &log, false, NULL, __func__, __LINE__,&tv);
}
if ((rack->r_ctl.gate_to_fs == 1) &&
(tp->snd_cwnd > rack->r_ctl.ss_hi_fs)) {
tp->snd_cwnd = rack->r_ctl.ss_hi_fs;
}
tp->snd_ssthresh = tp->snd_cwnd - 1;
rack->r_fast_output = 0;
}
}
static int
rack_do_compressed_ack_processing(struct tcpcb *tp, struct socket *so, struct mbuf *m, int nxt_pkt, struct timeval *tv)
{
#ifdef TCP_ACCOUNTING
uint64_t ts_val;
uint64_t rdstc;
#endif
int segsiz;
struct timespec ts;
struct tcp_rack *rack;
struct tcp_ackent *ae;
uint32_t tiwin, ms_cts, cts, acked, acked_amount, high_seq, win_seq, the_win, win_upd_ack;
int cnt, i, did_out, ourfinisacked = 0;
struct tcpopt to_holder, *to = NULL;
#ifdef TCP_ACCOUNTING
int win_up_req = 0;
#endif
int nsegs = 0;
int under_pacing = 0;
int post_recovery = 0;
#ifdef TCP_ACCOUNTING
sched_pin();
#endif
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (rack->gp_ready &&
(rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT))
under_pacing = 1;
if (rack->r_state != tp->t_state)
rack_set_state(tp, rack);
if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
(tp->t_flags & TF_GPUTINPROG)) {
uint32_t bytes;
bytes = tp->gput_ack - tp->gput_seq;
if (SEQ_GT(tp->gput_seq, tp->snd_una))
bytes += tp->gput_seq - tp->snd_una;
if (bytes > sbavail(&tptosocket(tp)->so_snd)) {
rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) ,
rack->r_ctl.rc_gp_srtt ,
tp->gput_seq,
0, 0, 18, __LINE__, NULL, 0);
tp->t_flags &= ~TF_GPUTINPROG;
}
}
to = &to_holder;
to->to_flags = 0;
KASSERT((m->m_len >= sizeof(struct tcp_ackent)),
("tp:%p m_cmpack:%p with invalid len:%u", tp, m, m->m_len));
cnt = m->m_len / sizeof(struct tcp_ackent);
counter_u64_add(rack_multi_single_eq, cnt);
high_seq = tp->snd_una;
the_win = tp->snd_wnd;
win_seq = tp->snd_wl1;
win_upd_ack = tp->snd_wl2;
cts = tcp_tv_to_usec(tv);
ms_cts = tcp_tv_to_msec(tv);
rack->r_ctl.rc_rcvtime = cts;
segsiz = ctf_fixed_maxseg(tp);
if ((rack->rc_gp_dyn_mul) &&
(rack->use_fixed_rate == 0) &&
(rack->rc_always_pace)) {
rack_check_probe_rtt(rack, cts);
}
for (i = 0; i < cnt; i++) {
#ifdef TCP_ACCOUNTING
ts_val = get_cyclecount();
#endif
rack_clear_rate_sample(rack);
ae = ((mtod(m, struct tcp_ackent *)) + i);
if (ae->flags & TH_FIN)
rack_log_pacing_delay_calc(rack,
0,
0,
0,
rack_get_gp_est(rack),
rack_get_lt_bw(rack),
20, __LINE__, NULL, 0);
tiwin = ae->win << tp->snd_scale;
if (tiwin > rack->r_ctl.rc_high_rwnd)
rack->r_ctl.rc_high_rwnd = tiwin;
if (SEQ_LT(ae->ack, high_seq)) {
ae->ack_val_set = ACK_BEHIND;
} else if (SEQ_GT(ae->ack, high_seq)) {
ae->ack_val_set = ACK_CUMACK;
} else if ((tiwin == the_win) && (rack->rc_in_persist == 0)){
ae->ack_val_set = ACK_DUPACK;
} else {
ae->ack_val_set = ACK_RWND;
}
rack_log_type_bbrsnd(rack, 0, 0, cts, tv, __LINE__);
rack_log_input_packet(tp, rack, ae, ae->ack_val_set, high_seq);
if (ae->flags & HAS_TSTMP) {
to->to_flags = TOF_TS;
ae->ts_echo -= tp->ts_offset;
to->to_tsecr = ae->ts_echo;
to->to_tsval = ae->ts_value;
if (TSTMP_GT(ae->ts_echo, ms_cts))
to->to_tsecr = 0;
if (tp->ts_recent &&
TSTMP_LT(ae->ts_value, tp->ts_recent)) {
if (ctf_ts_check_ac(tp, (ae->flags & 0xff))) {
#ifdef TCP_ACCOUNTING
rdstc = get_cyclecount();
if (rdstc > ts_val) {
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_proc_time[ae->ack_val_set] += (rdstc - ts_val);
}
}
#endif
continue;
}
}
if (SEQ_LEQ(ae->seq, tp->last_ack_sent) &&
SEQ_LEQ(tp->last_ack_sent, ae->seq)) {
tp->ts_recent_age = tcp_ts_getticks();
tp->ts_recent = ae->ts_value;
}
} else {
to->to_flags = 0;
}
if (tp->t_idle_reduce &&
(tp->snd_max == tp->snd_una) &&
(TICKS_2_USEC(ticks - tp->t_rcvtime) >= tp->t_rxtcur)) {
counter_u64_add(rack_input_idle_reduces, 1);
rack_cc_after_idle(rack, tp);
}
tp->t_rcvtime = ticks;
if (tcp_ecn_input_segment(tp, ae->flags, 0,
tcp_packets_this_ack(tp, ae->ack),
ae->codepoint))
rack_cong_signal(tp, CC_ECN, ae->ack, __LINE__);
if (tp->t_flags & TF_ACKNOW)
rack->r_wanted_output = 1;
#ifdef TCP_ACCOUNTING
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[ae->ack_val_set]++;
}
#endif
if (ae->ack_val_set == ACK_BEHIND) {
if (SEQ_LT(ae->ack, tp->snd_una) && (sbspace(&so->so_rcv) > segsiz)) {
rack->r_ctl.rc_reorder_ts = tcp_tv_to_usec(&rack->r_ctl.act_rcv_time);
if (rack->r_ctl.rc_reorder_ts == 0)
rack->r_ctl.rc_reorder_ts = 1;
}
} else if (ae->ack_val_set == ACK_DUPACK) {
rack_strike_dupack(rack, ae->ack);
} else if (ae->ack_val_set == ACK_RWND) {
if ((ae->flags & TSTMP_LRO) || (ae->flags & TSTMP_HDWR)) {
ts.tv_sec = ae->timestamp / 1000000000;
ts.tv_nsec = ae->timestamp % 1000000000;
rack->r_ctl.act_rcv_time.tv_sec = ts.tv_sec;
rack->r_ctl.act_rcv_time.tv_usec = ts.tv_nsec/1000;
} else {
rack->r_ctl.act_rcv_time = *tv;
}
if (rack->forced_ack) {
rack_handle_probe_response(rack, tiwin,
tcp_tv_to_usec(&rack->r_ctl.act_rcv_time));
}
#ifdef TCP_ACCOUNTING
win_up_req = 1;
#endif
win_upd_ack = ae->ack;
win_seq = ae->seq;
the_win = tiwin;
rack_do_win_updates(tp, rack, the_win, win_seq, win_upd_ack, cts);
} else {
if (SEQ_GT(ae->ack, tp->snd_max)) {
if ((tp->t_flags & TF_ACKNOW) == 0) {
ctf_ack_war_checks(tp);
if (tp->t_flags && TF_ACKNOW)
rack->r_wanted_output = 1;
}
} else {
nsegs++;
if (tiwin != tp->snd_wnd) {
win_upd_ack = ae->ack;
win_seq = ae->seq;
the_win = tiwin;
rack_do_win_updates(tp, rack, the_win, win_seq, win_upd_ack, cts);
}
#ifdef TCP_ACCOUNTING
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[CNT_OF_ACKS_IN] += (((ae->ack - high_seq) + segsiz - 1) / segsiz);
}
#endif
high_seq = ae->ack;
if ((ae->flags & TSTMP_LRO) || (ae->flags & TSTMP_HDWR)) {
ts.tv_sec = ae->timestamp / 1000000000;
ts.tv_nsec = ae->timestamp % 1000000000;
rack->r_ctl.act_rcv_time.tv_sec = ts.tv_sec;
rack->r_ctl.act_rcv_time.tv_usec = ts.tv_nsec/1000;
} else {
rack->r_ctl.act_rcv_time = *tv;
}
rack_process_to_cumack(tp, rack, ae->ack, cts, to,
tcp_tv_to_lusec(&rack->r_ctl.act_rcv_time));
#ifdef TCP_REQUEST_TRK
rack_req_check_for_comp(rack, high_seq);
#endif
if (rack->rc_dsack_round_seen) {
if (SEQ_GEQ(ae->ack, rack->r_ctl.dsack_round_end)) {
rack->rc_dsack_round_seen = 0;
rack_log_dsack_event(rack, 3, __LINE__, 0, 0);
}
}
}
}
tcp_rack_xmit_timer_commit(rack, tp);
#ifdef TCP_ACCOUNTING
rdstc = get_cyclecount();
if (rdstc > ts_val) {
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_proc_time[ae->ack_val_set] += (rdstc - ts_val);
if (ae->ack_val_set == ACK_CUMACK)
tp->tcp_proc_time[CYC_HANDLE_MAP] += (rdstc - ts_val);
}
}
#endif
}
#ifdef TCP_ACCOUNTING
ts_val = get_cyclecount();
#endif
if (SEQ_GT(tp->snd_max, high_seq) && (tp->snd_wnd < (tp->snd_max - high_seq))) {
rack_collapsed_window(rack, (tp->snd_max - high_seq), high_seq, __LINE__);
} else if (rack->rc_has_collapsed)
rack_un_collapse_window(rack, __LINE__);
if ((rack->r_collapse_point_valid) &&
(SEQ_GT(high_seq, rack->r_ctl.high_collapse_point)))
rack->r_collapse_point_valid = 0;
acked_amount = acked = (high_seq - tp->snd_una);
if (acked) {
if (SEQ_GEQ(high_seq, rack->r_ctl.roundends) &&
(rack->rc_new_rnd_needed == 0) &&
(nxt_pkt == 0)) {
rack_new_round_setup(tp, rack, high_seq);
}
rack->probe_not_answered = 0;
if (tp->t_flags & TF_NEEDSYN) {
tp->t_flags &= ~TF_NEEDSYN;
tp->snd_una++;
acked_amount = acked = (high_seq - tp->snd_una);
}
if (acked > sbavail(&so->so_snd))
acked_amount = sbavail(&so->so_snd);
if (IN_FASTRECOVERY(tp->t_flags) &&
(rack->rack_no_prr == 0))
rack_update_prr(tp, rack, acked_amount, high_seq);
if (IN_RECOVERY(tp->t_flags)) {
if (SEQ_LT(high_seq, tp->snd_recover) &&
(SEQ_LT(high_seq, tp->snd_max))) {
tcp_rack_partialack(tp);
} else {
rack_post_recovery(tp, high_seq);
post_recovery = 1;
}
} else if ((rack->rto_from_rec == 1) &&
SEQ_GEQ(high_seq, tp->snd_recover)) {
rack->rto_from_rec = 0;
}
if ((sbused(&so->so_snd) == 0) &&
(acked > acked_amount) &&
(tp->t_state >= TCPS_FIN_WAIT_1) &&
(tp->t_flags & TF_SENTFIN)) {
ourfinisacked = 1;
tp->snd_una = high_seq;
}
if ((tp->t_flags & TF_PREVVALID) &&
((tp->t_flags & TF_RCVD_TSTMP) == 0)) {
tp->t_flags &= ~TF_PREVVALID;
if (tp->t_rxtshift == 1 &&
(int)(ticks - tp->t_badrxtwin) < 0)
rack_cong_signal(tp, CC_RTO_ERR, high_seq, __LINE__);
}
KMOD_TCPSTAT_ADD(tcps_rcvackpack, 1);
KMOD_TCPSTAT_ADD(tcps_rcvackbyte, acked);
if (acked_amount > 0) {
uint32_t p_cwnd;
struct mbuf *mfree;
if (post_recovery) {
p_cwnd = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
p_cwnd <<= 1;
p_cwnd += tp->snd_cwnd;
}
rack_ack_received(tp, rack, high_seq, nsegs, CC_ACK, post_recovery);
if (post_recovery && (tp->snd_cwnd > p_cwnd)) {
tp->snd_cwnd = p_cwnd;
}
SOCK_SENDBUF_LOCK(so);
mfree = sbcut_locked(&so->so_snd, acked_amount);
tp->snd_una = high_seq;
rack_adjust_sendmap_head(rack, &so->so_snd);
rack_log_wakeup(tp,rack, &so->so_snd, acked, 2);
sowwakeup_locked(so);
m_freem(mfree);
}
tp->t_acktime = ticks;
rack_log_progress_event(rack, tp, tp->t_acktime,
PROGRESS_UPDATE, __LINE__);
tp->t_rxtshift = 0;
RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
rack->rc_tlp_in_progress = 0;
rack->r_ctl.rc_tlp_cnt_out = 0;
if (SEQ_GT(tp->snd_una, tp->snd_recover))
tp->snd_recover = tp->snd_una;
if (SEQ_LT(tp->snd_nxt, tp->snd_max))
tp->snd_nxt = tp->snd_max;
if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT)
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
tp->snd_wl2 = high_seq;
tp->t_dupacks = 0;
if (under_pacing &&
(rack->use_fixed_rate == 0) &&
(rack->in_probe_rtt == 0) &&
rack->rc_gp_dyn_mul &&
rack->rc_always_pace) {
rack_check_bottom_drag(tp, rack, so);
}
if (tp->snd_una == tp->snd_max) {
tp->t_flags &= ~TF_PREVVALID;
rack->r_ctl.retran_during_recovery = 0;
rack->rc_suspicious = 0;
rack->r_ctl.dsack_byte_cnt = 0;
rack->r_ctl.rc_went_idle_time = tcp_get_usecs(NULL);
if (rack->r_ctl.rc_went_idle_time == 0)
rack->r_ctl.rc_went_idle_time = 1;
rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__);
if (sbavail(&tptosocket(tp)->so_snd) == 0)
tp->t_acktime = 0;
rack->r_wanted_output = 1;
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
(sbavail(&so->so_snd) == 0) &&
(tp->t_flags2 & TF2_DROP_AF_DATA)) {
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
#ifdef TCP_ACCOUNTING
rdstc = get_cyclecount();
if (rdstc > ts_val) {
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
}
}
#endif
m_freem(m);
tp = tcp_close(tp);
if (tp == NULL) {
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (1);
}
goto send_out_a_rst;
}
if ((sbused(&so->so_snd) == 0) &&
(tp->t_state >= TCPS_FIN_WAIT_1) &&
(tp->t_flags & TF_SENTFIN)) {
if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
soisdisconnected(so);
tcp_timer_activate(tp, TT_2MSL,
(tcp_fast_finwait2_recycle ?
tcp_finwait2_timeout :
TP_MAXIDLE(tp)));
}
if (ourfinisacked == 0) {
tcp_state_change(tp, TCPS_FIN_WAIT_2);
}
}
}
if (sbavail(&so->so_snd)) {
rack->r_wanted_output = 1;
if (ctf_progress_timeout_check(tp, true)) {
rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
tp, tick, PROGRESS_DROP, __LINE__);
#ifdef TCP_ACCOUNTING
rdstc = get_cyclecount();
if (rdstc > ts_val) {
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
}
}
sched_unpin();
#endif
(void)tcp_drop(tp, ETIMEDOUT);
m_freem(m);
return (1);
}
}
if (ourfinisacked) {
switch(tp->t_state) {
case TCPS_CLOSING:
#ifdef TCP_ACCOUNTING
rdstc = get_cyclecount();
if (rdstc > ts_val) {
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
}
}
sched_unpin();
#endif
tcp_twstart(tp);
m_freem(m);
return (1);
break;
case TCPS_LAST_ACK:
#ifdef TCP_ACCOUNTING
rdstc = get_cyclecount();
if (rdstc > ts_val) {
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
}
}
sched_unpin();
#endif
tp = tcp_close(tp);
ctf_do_drop(m, tp);
return (1);
break;
case TCPS_FIN_WAIT_1:
#ifdef TCP_ACCOUNTING
rdstc = get_cyclecount();
if (rdstc > ts_val) {
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
}
}
#endif
if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
soisdisconnected(so);
tcp_timer_activate(tp, TT_2MSL,
(tcp_fast_finwait2_recycle ?
tcp_finwait2_timeout :
TP_MAXIDLE(tp)));
}
tcp_state_change(tp, TCPS_FIN_WAIT_2);
break;
default:
break;
}
}
if (rack->r_fast_output) {
rack_gain_for_fastoutput(rack, tp, so, acked_amount);
}
#ifdef TCP_ACCOUNTING
rdstc = get_cyclecount();
if (rdstc > ts_val) {
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
}
}
} else if (win_up_req) {
rdstc = get_cyclecount();
if (rdstc > ts_val) {
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_proc_time[ACK_RWND] += (rdstc - ts_val);
}
}
#endif
}
m_freem(m);
did_out = 0;
if (nxt_pkt) {
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
rack_log_doseg_done(rack, cts, nxt_pkt, did_out, 5, nsegs);
return (0);
}
rack_handle_might_revert(tp, rack);
ctf_calc_rwin(so, tp);
if ((rack->r_wanted_output != 0) ||
(rack->r_fast_output != 0) ||
(tp->t_flags & TF_ACKNOW )) {
send_out_a_rst:
if (tcp_output(tp) < 0) {
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (1);
}
did_out = 1;
}
if (tp->t_flags2 & TF2_HPTS_CALLS)
tp->t_flags2 &= ~TF2_HPTS_CALLS;
rack_free_trim(rack);
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
rack_timer_audit(tp, rack, &so->so_snd);
rack_log_doseg_done(rack, cts, nxt_pkt, did_out, 6, nsegs);
return (0);
}
#define TCP_LRO_TS_OPTION \
ntohl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | \
(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)
static int
rack_do_segment_nounlock(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th,
int32_t drop_hdrlen, int32_t tlen, uint8_t iptos, int32_t nxt_pkt,
struct timeval *tv)
{
struct inpcb *inp = tptoinpcb(tp);
struct socket *so = tptosocket(tp);
#ifdef TCP_ACCOUNTING
uint64_t ts_val;
#endif
int32_t thflags, retval, did_out = 0;
int32_t way_out = 0;
uint32_t cts, us_cts, ms_cts;
uint32_t tiwin;
struct timespec ts;
struct tcpopt to;
struct tcp_rack *rack;
struct rack_sendmap *rsm;
int32_t prev_state = 0;
int no_output = 0;
int time_remaining = 0;
#ifdef TCP_ACCOUNTING
int ack_val_set = 0xf;
#endif
int nsegs;
NET_EPOCH_ASSERT();
INP_WLOCK_ASSERT(inp);
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (rack->rack_deferred_inited == 0) {
rack_deferred_init(tp, rack);
}
us_cts = tcp_tv_to_usec(tv);
if (m->m_flags & M_ACKCMP) {
rack->rc_ack_required = 0;
return (rack_do_compressed_ack_processing(tp, so, m, nxt_pkt, tv));
}
thflags = tcp_get_flags(th);
if ((rack->rc_always_pace == 1) &&
(rack->rc_ack_can_sendout_data == 0) &&
(rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
(TSTMP_LT(us_cts, rack->r_ctl.rc_last_output_to))) {
time_remaining = rack->r_ctl.rc_last_output_to - us_cts;
if (rack->rc_tp->t_flags2 & TF2_DONT_SACK_QUEUE) {
no_output = 1;
} else {
uint32_t *ts_ptr;
int optlen;
optlen = (th->th_off << 2) - sizeof(struct tcphdr);
ts_ptr = (uint32_t *)(th + 1);
if ((optlen == 0) ||
((optlen == TCPOLEN_TSTAMP_APPA) &&
(*ts_ptr == TCP_LRO_TS_OPTION)))
no_output = 1;
}
if ((no_output == 1) && (time_remaining < tcp_min_hptsi_time)) {
no_output = 0;
}
}
if ((thflags & TH_FIN) || (thflags & TH_RST))
rack_log_pacing_delay_calc(rack,
rack->r_ctl.gp_bw,
0,
0,
rack_get_gp_est(rack),
rack_get_lt_bw(rack),
20, __LINE__, NULL, 0);
if (m->m_flags & M_ACKCMP) {
panic("Impossible reach m has ackcmp? m:%p tp:%p", m, tp);
}
cts = tcp_tv_to_usec(tv);
ms_cts = tcp_tv_to_msec(tv);
nsegs = m->m_pkthdr.lro_nsegs;
counter_u64_add(rack_proc_non_comp_ack, 1);
#ifdef TCP_ACCOUNTING
sched_pin();
if (thflags & TH_ACK)
ts_val = get_cyclecount();
#endif
if ((m->m_flags & M_TSTMP) ||
(m->m_flags & M_TSTMP_LRO)) {
mbuf_tstmp2timespec(m, &ts);
rack->r_ctl.act_rcv_time.tv_sec = ts.tv_sec;
rack->r_ctl.act_rcv_time.tv_usec = ts.tv_nsec/1000;
} else
rack->r_ctl.act_rcv_time = *tv;
kern_prefetch(rack, &prev_state);
prev_state = 0;
tiwin = th->th_win << tp->snd_scale;
#ifdef TCP_ACCOUNTING
if (thflags & TH_ACK) {
ack_val_set = tcp_do_ack_accounting(tp, th, &to, tiwin,
ctf_fixed_maxseg(tp));
}
#endif
memset(&to, 0, sizeof(to));
tcp_dooptions(&to, (u_char *)(th + 1),
(th->th_off << 2) - sizeof(struct tcphdr),
(thflags & TH_SYN) ? TO_SYN : 0);
KASSERT(tp->t_state > TCPS_LISTEN, ("%s: TCPS_LISTEN",
__func__));
KASSERT(tp->t_state != TCPS_TIME_WAIT, ("%s: TCPS_TIME_WAIT",
__func__));
if (tp->t_flags2 & TF2_PROC_SACK_PROHIBIT) {
to.to_flags &= ~TOF_SACK;
}
if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
(tp->t_flags & TF_GPUTINPROG)) {
uint32_t bytes;
bytes = tp->gput_ack - tp->gput_seq;
if (SEQ_GT(tp->gput_seq, tp->snd_una))
bytes += tp->gput_seq - tp->snd_una;
if (bytes > sbavail(&tptosocket(tp)->so_snd)) {
rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) ,
rack->r_ctl.rc_gp_srtt ,
tp->gput_seq,
0, 0, 18, __LINE__, NULL, 0);
tp->t_flags &= ~TF_GPUTINPROG;
}
}
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval ltv;
#ifdef TCP_REQUEST_TRK
struct tcp_sendfile_track *tcp_req;
if (SEQ_GT(th->th_ack, tp->snd_una)) {
tcp_req = tcp_req_find_req_for_seq(tp, (th->th_ack-1));
} else {
tcp_req = tcp_req_find_req_for_seq(tp, th->th_ack);
}
#endif
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
if (rack->rack_no_prr == 0)
log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
else
log.u_bbr.flex1 = 0;
log.u_bbr.use_lt_bw = rack->r_ent_rec_ns;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->r_might_revert;
log.u_bbr.flex2 = rack->r_ctl.rc_num_maps_alloced;
log.u_bbr.bbr_state = rack->rc_free_cnt;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.pkts_out = rack->rc_tp->t_maxseg;
log.u_bbr.flex3 = m->m_flags;
log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
log.u_bbr.lost = thflags;
log.u_bbr.pacing_gain = 0x1;
#ifdef TCP_ACCOUNTING
log.u_bbr.cwnd_gain = ack_val_set;
#endif
log.u_bbr.flex7 = 2;
if (m->m_flags & M_TSTMP) {
mbuf_tstmp2timespec(m, &ts);
ltv.tv_sec = ts.tv_sec;
ltv.tv_usec = ts.tv_nsec / 1000;
log.u_bbr.lt_epoch = tcp_tv_to_usec(<v);
} else if (m->m_flags & M_TSTMP_LRO) {
mbuf_tstmp2timespec(m, &ts);
ltv.tv_sec = ts.tv_sec;
ltv.tv_usec = ts.tv_nsec / 1000;
log.u_bbr.flex5 = tcp_tv_to_usec(<v);
}
log.u_bbr.timeStamp = tcp_get_usecs(<v);
log.u_bbr.delRate = m->m_pkthdr.rcv_tstmp;
#ifdef TCP_REQUEST_TRK
log.u_bbr.applimited = tp->t_tcpreq_closed;
log.u_bbr.applimited <<= 8;
log.u_bbr.applimited |= tp->t_tcpreq_open;
log.u_bbr.applimited <<= 8;
log.u_bbr.applimited |= tp->t_tcpreq_req;
if (tcp_req) {
log.u_bbr.pkt_epoch = (tcp_req->localtime / HPTS_USEC_IN_SEC);
log.u_bbr.delivered = (tcp_req->localtime % HPTS_USEC_IN_SEC);
log.u_bbr.rttProp = tcp_req->timestamp;
log.u_bbr.cur_del_rate = tcp_req->start;
if (tcp_req->flags & TCP_TRK_TRACK_FLG_OPEN) {
log.u_bbr.flex8 |= 1;
} else {
log.u_bbr.flex8 |= 2;
log.u_bbr.bw_inuse = tcp_req->end;
}
log.u_bbr.flex6 = tcp_req->start_seq;
if (tcp_req->flags & TCP_TRK_TRACK_FLG_COMP) {
log.u_bbr.flex8 |= 4;
log.u_bbr.epoch = tcp_req->end_seq;
}
}
#endif
TCP_LOG_EVENTP(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_IN, 0,
tlen, &log, true, <v);
}
if (thflags & TH_ACK)
rack->rc_ack_required = 0;
rack_log_type_bbrsnd(rack, 0, 0, cts, tv, __LINE__);
if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) {
way_out = 4;
retval = 0;
m_freem(m);
goto done_with_input;
}
if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) &&
(SEQ_LEQ(th->th_ack, tp->iss) || SEQ_GT(th->th_ack, tp->snd_max))) {
tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, tlen);
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (1);
}
if ((tp->t_flags & TF_RCVD_TSTMP) && !(to.to_flags & TOF_TS) &&
((thflags & TH_RST) == 0) && (V_tcp_tolerate_missing_ts == 0)) {
way_out = 5;
retval = 0;
m_freem(m);
goto done_with_input;
}
if (tp->t_idle_reduce &&
(tp->snd_max == tp->snd_una) &&
(TICKS_2_USEC(ticks - tp->t_rcvtime) >= tp->t_rxtcur)) {
counter_u64_add(rack_input_idle_reduces, 1);
rack_cc_after_idle(rack, tp);
}
tp->t_rcvtime = ticks;
#ifdef STATS
stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_FRWIN, tiwin);
#endif
if (tiwin > rack->r_ctl.rc_high_rwnd)
rack->r_ctl.rc_high_rwnd = tiwin;
if (tcp_ecn_input_segment(tp, thflags, tlen,
tcp_packets_this_ack(tp, th->th_ack),
iptos))
rack_cong_signal(tp, CC_ECN, th->th_ack, __LINE__);
if (tp->t_flags & TF_ACKNOW)
rack->r_wanted_output = 1;
if ((to.to_flags & TOF_TS) && (to.to_tsecr != 0)) {
to.to_tsecr -= tp->ts_offset;
if (TSTMP_GT(to.to_tsecr, ms_cts))
to.to_tsecr = 0;
}
if ((rack->r_rcvpath_rtt_up == 1) &&
(to.to_flags & TOF_TS) &&
(TSTMP_GEQ(to.to_tsecr, rack->r_ctl.last_rcv_tstmp_for_rtt))) {
uint32_t rtt = 0;
if (TSTMP_GT(cts, rack->r_ctl.last_time_of_arm_rcv))
rtt = (cts - rack->r_ctl.last_time_of_arm_rcv);
rack->r_rcvpath_rtt_up = 0;
if (rtt > 0) {
tcp_rack_xmit_timer(rack, rtt, 0, rtt, 4, NULL, 1);
tcp_rack_xmit_timer_commit(rack, tp);
}
}
if (rack->r_state == 0) {
KASSERT(rack->rc_inp != NULL,
("%s: rack->rc_inp unexpectedly NULL", __func__));
if (rack->rc_inp == NULL) {
rack->rc_inp = inp;
}
if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) {
tcp_ecn_input_parallel_syn(tp, thflags, iptos);
if ((to.to_flags & TOF_SCALE) &&
(tp->t_flags & TF_REQ_SCALE)) {
tp->t_flags |= TF_RCVD_SCALE;
tp->snd_scale = to.to_wscale;
} else
tp->t_flags &= ~TF_REQ_SCALE;
tp->snd_wnd = th->th_win;
rack_validate_fo_sendwin_up(tp, rack);
if ((to.to_flags & TOF_TS) &&
(tp->t_flags & TF_REQ_TSTMP)) {
tp->t_flags |= TF_RCVD_TSTMP;
tp->ts_recent = to.to_tsval;
tp->ts_recent_age = cts;
} else
tp->t_flags &= ~TF_REQ_TSTMP;
if (to.to_flags & TOF_MSS) {
tcp_mss(tp, to.to_mss);
}
if ((tp->t_flags & TF_SACK_PERMIT) &&
(to.to_flags & TOF_SACKPERM) == 0)
tp->t_flags &= ~TF_SACK_PERMIT;
if (tp->t_flags & TF_FASTOPEN) {
if (to.to_flags & TOF_FASTOPEN) {
uint16_t mss;
if (to.to_flags & TOF_MSS)
mss = to.to_mss;
else
if ((inp->inp_vflag & INP_IPV6) != 0)
mss = TCP6_MSS;
else
mss = TCP_MSS;
tcp_fastopen_update_cache(tp, mss,
to.to_tfo_len, to.to_tfo_cookie);
} else
tcp_fastopen_disable_path(tp);
}
}
if ((rack_sack_not_required == 0) &&
((tp->t_flags & TF_SACK_PERMIT) == 0)) {
tcp_switch_back_to_default(tp);
(*tp->t_fb->tfb_tcp_do_segment)(tp, m, th, drop_hdrlen,
tlen, iptos);
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (1);
}
tcp_set_hpts(tp);
sack_filter_clear(&rack->r_ctl.rack_sf, th->th_ack);
}
if (thflags & TH_FIN)
tcp_log_end_status(tp, TCP_EI_STATUS_CLIENT_FIN);
us_cts = tcp_tv_to_usec(&rack->r_ctl.act_rcv_time);
if ((rack->rc_gp_dyn_mul) &&
(rack->use_fixed_rate == 0) &&
(rack->rc_always_pace)) {
rack_check_probe_rtt(rack, cts);
}
rack_clear_rate_sample(rack);
if ((rack->forced_ack) &&
((tcp_get_flags(th) & TH_RST) == 0)) {
rack_handle_probe_response(rack, tiwin, us_cts);
}
rack->r_ctl.rc_rcvtime = cts;
if (rack->r_state != tp->t_state)
rack_set_state(tp, rack);
if (SEQ_GT(th->th_ack, tp->snd_una) &&
(rsm = tqhash_min(rack->r_ctl.tqh)) != NULL)
kern_prefetch(rsm, &prev_state);
prev_state = rack->r_state;
if ((thflags & TH_RST) &&
((SEQ_GEQ(th->th_seq, tp->last_ack_sent) &&
SEQ_LT(th->th_seq, tp->last_ack_sent + tp->rcv_wnd)) ||
(tp->rcv_wnd == 0 && tp->last_ack_sent == th->th_seq))) {
tcp_trace_point(rack->rc_tp, TCP_TP_RESET_RCV);
}
retval = (*rack->r_substate) (m, th, so,
tp, &to, drop_hdrlen,
tlen, tiwin, thflags, nxt_pkt, iptos);
if (retval == 0) {
INP_WLOCK_ASSERT(inp);
if ((rack->rc_gp_dyn_mul) &&
(rack->rc_always_pace) &&
(rack->use_fixed_rate == 0) &&
rack->in_probe_rtt &&
(rack->r_ctl.rc_time_probertt_starts == 0)) {
rack_check_probe_rtt(rack, cts);
}
if (rack->set_pacing_done_a_iw == 0) {
if ((tp->snd_una - tp->iss) > (ctf_fixed_maxseg(tp) * 10)) {
rack->set_pacing_done_a_iw = 1;
rack_set_pace_segments(tp, rack, __LINE__, NULL);
}
}
tcp_rack_xmit_timer_commit(rack, tp);
#ifdef TCP_ACCOUNTING
if (ack_val_set != 0xf) {
uint64_t crtsc;
crtsc = get_cyclecount();
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_proc_time[ack_val_set] += (crtsc - ts_val);
}
}
#endif
if ((nxt_pkt == 0) && (no_output == 0)) {
if ((rack->r_wanted_output != 0) ||
(tp->t_flags & TF_ACKNOW) ||
(rack->r_fast_output != 0)) {
do_output_now:
if (tcp_output(tp) < 0) {
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (1);
}
did_out = 1;
}
rack_start_hpts_timer(rack, tp, cts, 0, 0, 0);
rack_free_trim(rack);
} else if ((nxt_pkt == 0) && (tp->t_flags & TF_ACKNOW)) {
goto do_output_now;
} else if ((no_output == 1) &&
(nxt_pkt == 0) &&
(tcp_in_hpts(rack->rc_tp) == 0)) {
KASSERT ((time_remaining != 0), ("slot remaining is zero for rack:%p tp:%p", rack, tp));
rack_start_hpts_timer(rack, tp, cts, time_remaining, 0, 0);
rack_free_trim(rack);
}
if ((nxt_pkt == 0) && (tp->t_flags2 & TF2_HPTS_CALLS))
tp->t_flags2 &= ~TF2_HPTS_CALLS;
if (SEQ_GEQ(tp->snd_una, rack->r_ctl.roundends) &&
(rack->rc_new_rnd_needed == 0) &&
(nxt_pkt == 0)) {
rack_new_round_setup(tp, rack, tp->snd_una);
}
if ((nxt_pkt == 0) &&
((rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) == 0) &&
(SEQ_GT(tp->snd_max, tp->snd_una) ||
(tp->t_flags & TF_DELACK) ||
((V_tcp_always_keepalive || rack->rc_inp->inp_socket->so_options & SO_KEEPALIVE) &&
(tp->t_state <= TCPS_CLOSING)))) {
if ((tp->snd_max == tp->snd_una) &&
((tp->t_flags & TF_DELACK) == 0) &&
(tcp_in_hpts(rack->rc_tp)) &&
(rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
;
} else {
int late = 0;
if (tcp_in_hpts(tp)) {
if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
us_cts = tcp_get_usecs(NULL);
if (TSTMP_GT(rack->r_ctl.rc_last_output_to, us_cts)) {
rack->r_early = 1;
rack->r_ctl.rc_agg_early += (rack->r_ctl.rc_last_output_to - us_cts);
} else
late = 1;
rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
}
tcp_hpts_remove(tp);
}
if (late && (did_out == 0)) {
goto do_output_now;
}
rack_start_hpts_timer(rack, tp, tcp_get_usecs(NULL), 0, 0, 0);
}
way_out = 1;
} else if (nxt_pkt == 0) {
rack_timer_audit(tp, rack, &so->so_snd);
way_out = 2;
}
done_with_input:
rack_log_doseg_done(rack, cts, nxt_pkt, did_out, way_out, max(1, nsegs));
if (did_out)
rack->r_wanted_output = 0;
}
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (retval);
}
static void
rack_do_segment(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th,
int32_t drop_hdrlen, int32_t tlen, uint8_t iptos)
{
struct timeval tv;
if (!STAILQ_EMPTY(&tp->t_inqueue)) {
if (ctf_do_queued_segments(tp, 1)) {
m_freem(m);
return;
}
}
if (m->m_flags & M_TSTMP_LRO) {
mbuf_tstmp2timeval(m, &tv);
} else {
tcp_get_usecs(&tv);
}
if (rack_do_segment_nounlock(tp, m, th, drop_hdrlen, tlen, iptos, 0,
&tv) == 0) {
INP_WUNLOCK(tptoinpcb(tp));
}
}
struct rack_sendmap *
tcp_rack_output(struct tcpcb *tp, struct tcp_rack *rack, uint32_t tsused)
{
struct rack_sendmap *rsm = NULL;
int32_t idx;
uint32_t srtt = 0, thresh = 0, ts_low = 0;
if (tqhash_empty(rack->r_ctl.tqh)) {
return (NULL);
}
if (tp->t_flags & TF_SENTFIN) {
return (NULL);
}
rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
if (rack->r_must_retran && rsm && (rsm->r_flags & RACK_MUST_RXT)) {
return (rsm);
}
if (rsm && ((rsm->r_flags & RACK_ACKED) == 0)) {
goto check_it;
}
rsm = rack_find_lowest_rsm(rack);
if (rsm == NULL) {
return (NULL);
}
check_it:
if (((rack->rc_tp->t_flags & TF_SACK_PERMIT) == 0) &&
(rsm->r_dupack >= DUP_ACK_THRESHOLD)) {
return (rsm);
}
if (rsm->r_flags & RACK_ACKED) {
return (NULL);
}
if (((rsm->r_flags & RACK_SACK_PASSED) == 0) &&
(rsm->r_dupack < DUP_ACK_THRESHOLD)) {
return (NULL);
}
srtt = rack_grab_rtt(tp, rack);
idx = rsm->r_rtr_cnt - 1;
ts_low = (uint32_t)rsm->r_tim_lastsent[idx];
thresh = rack_calc_thresh_rack(rack, srtt, tsused, __LINE__, 1);
if ((tsused == ts_low) ||
(TSTMP_LT(tsused, ts_low))) {
return (NULL);
}
if ((tsused - ts_low) < thresh) {
return (NULL);
}
if ((rsm->r_dupack >= DUP_ACK_THRESHOLD) ||
((rsm->r_flags & RACK_SACK_PASSED))) {
rack_log_retran_reason(rack, rsm, (tsused - ts_low), thresh, 1);
rack->r_fast_output = 0;
return (rsm);
}
return (NULL);
}
static void
rack_log_pacing_delay_calc (struct tcp_rack *rack, uint32_t len, uint32_t pacing_delay,
uint64_t bw_est, uint64_t bw, uint64_t len_time, int method,
int line, struct rack_sendmap *rsm, uint8_t quality)
{
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
if (rack_verbose_logging == 0) {
if ((method != 2) &&
(method != 3) &&
(method != 7) &&
(method != 89) &&
(method != 14) &&
(method != 20)) {
return;
}
}
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = pacing_delay;
log.u_bbr.flex2 = len;
log.u_bbr.flex3 = rack->r_ctl.rc_pace_min_segs;
log.u_bbr.flex4 = rack->r_ctl.rc_pace_max_segs;
log.u_bbr.flex5 = rack->r_ctl.rack_per_of_gp_ss;
log.u_bbr.flex6 = rack->r_ctl.rack_per_of_gp_ca;
log.u_bbr.use_lt_bw = rack->rc_ack_can_sendout_data;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->r_late;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->r_early;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->app_limited_needs_set;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->rc_gp_filled;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->measure_saw_probe_rtt;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->in_probe_rtt;
log.u_bbr.use_lt_bw <<= 1;
log.u_bbr.use_lt_bw |= rack->gp_ready;
log.u_bbr.pkt_epoch = line;
log.u_bbr.epoch = rack->r_ctl.rc_agg_delayed;
log.u_bbr.lt_epoch = rack->r_ctl.rc_agg_early;
log.u_bbr.applimited = rack->r_ctl.rack_per_of_gp_rec;
log.u_bbr.bw_inuse = bw_est;
log.u_bbr.delRate = bw;
if (rack->r_ctl.gp_bw == 0)
log.u_bbr.cur_del_rate = 0;
else
log.u_bbr.cur_del_rate = rack_get_bw(rack);
log.u_bbr.rttProp = len_time;
log.u_bbr.pkts_out = rack->r_ctl.rc_rack_min_rtt;
log.u_bbr.lost = rack->r_ctl.rc_probertt_sndmax_atexit;
log.u_bbr.pacing_gain = rack_get_output_gain(rack, rsm);
if (rack->r_ctl.cwnd_to_use < rack->rc_tp->snd_ssthresh) {
log.u_bbr.flex7 = 1;
} else {
log.u_bbr.flex7 = 0;
}
log.u_bbr.flex8 = method;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.cwnd_gain = rack->rc_gp_saw_rec;
log.u_bbr.cwnd_gain <<= 1;
log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ss;
log.u_bbr.cwnd_gain <<= 1;
log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ca;
log.u_bbr.cwnd_gain <<= 1;
log.u_bbr.cwnd_gain |= rack->use_fixed_rate;
log.u_bbr.cwnd_gain <<= 1;
log.u_bbr.cwnd_gain |= rack->rc_always_pace;
log.u_bbr.cwnd_gain <<= 1;
log.u_bbr.cwnd_gain |= rack->gp_ready;
log.u_bbr.bbr_substate = quality;
log.u_bbr.bbr_state = rack->dgp_on;
log.u_bbr.bbr_state <<= 1;
log.u_bbr.bbr_state |= rack->rc_pace_to_cwnd;
log.u_bbr.bbr_state <<= 2;
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_HPTSI_CALC, 0,
0, &log, false, &tv);
}
}
static uint32_t
rack_get_pacing_len(struct tcp_rack *rack, uint64_t bw, uint32_t mss)
{
uint32_t new_tso, user_max, pace_one;
user_max = rack->rc_user_set_max_segs * mss;
if (rack->rc_force_max_seg) {
return (user_max);
}
if (rack->use_fixed_rate &&
((rack->r_ctl.crte == NULL) ||
(bw != rack->r_ctl.crte->rate))) {
return (user_max);
}
if (rack_pace_one_seg ||
(rack->r_ctl.rc_user_set_min_segs == 1))
pace_one = 1;
else
pace_one = 0;
new_tso = tcp_get_pacing_burst_size_w_divisor(rack->rc_tp, bw, mss,
pace_one, rack->r_ctl.crte, NULL, rack->r_ctl.pace_len_divisor);
if (new_tso > user_max)
new_tso = user_max;
if (rack->rc_hybrid_mode && rack->r_ctl.client_suggested_maxseg) {
if (((uint32_t)rack->r_ctl.client_suggested_maxseg * mss) > new_tso)
new_tso = (uint32_t)rack->r_ctl.client_suggested_maxseg * mss;
}
if (rack->r_ctl.rc_user_set_min_segs &&
((rack->r_ctl.rc_user_set_min_segs * mss) > new_tso))
new_tso = rack->r_ctl.rc_user_set_min_segs * mss;
return (new_tso);
}
static uint64_t
rack_arrive_at_discounted_rate(struct tcp_rack *rack, uint64_t window_input, uint32_t *rate_set, uint32_t *gain_b)
{
uint64_t reduced_win;
uint32_t gain;
if (window_input < rc_init_window(rack)) {
reduced_win = rack_get_lt_bw(rack);
*rate_set = 1;
gain = 100;
} else if (IN_RECOVERY(rack->rc_tp->t_flags)) {
if (rack->rack_hibeta == 0) {
reduced_win = window_input / 2;
gain = 50;
} else {
reduced_win = window_input * rack->r_ctl.saved_hibeta;
reduced_win /= 100;
gain = rack->r_ctl.saved_hibeta;
}
} else {
gain = rack_get_output_gain(rack, NULL);
if (gain > rack_gain_p5_ub) {
gain = rack_gain_p5_ub;
}
reduced_win = window_input * gain;
reduced_win /= 100;
}
if (gain_b != NULL)
*gain_b = gain;
return (reduced_win);
}
static int32_t
pace_to_fill_cwnd(struct tcp_rack *rack, int32_t pacing_delay, uint32_t len, uint32_t segsiz, int *capped, uint64_t *rate_wanted, uint8_t non_paced)
{
uint64_t lentim, fill_bw;
rack->r_via_fill_cw = 0;
if (ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) > rack->r_ctl.cwnd_to_use)
return (pacing_delay);
if ((ctf_outstanding(rack->rc_tp) + (segsiz-1)) > rack->rc_tp->snd_wnd)
return (pacing_delay);
if (rack->r_ctl.rc_last_us_rtt == 0)
return (pacing_delay);
if (rack->rc_pace_fill_if_rttin_range &&
(rack->r_ctl.rc_last_us_rtt >=
(get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack->rtt_limit_mul))) {
return (pacing_delay);
}
if (rack->r_ctl.fillcw_cap && *rate_wanted >= rack->r_ctl.fillcw_cap)
return (pacing_delay);
fill_bw = min(rack->rc_tp->snd_cwnd, rack->r_ctl.cwnd_to_use);
if (rack->rc_fillcw_apply_discount) {
uint32_t rate_set = 0;
fill_bw = rack_arrive_at_discounted_rate(rack, fill_bw, &rate_set, NULL);
if (rate_set) {
goto at_lt_bw;
}
}
if (fill_bw > rack->rc_tp->snd_wnd)
fill_bw = rack->rc_tp->snd_wnd;
fill_bw *= (uint64_t)HPTS_USEC_IN_SEC;
fill_bw /= (uint64_t)rack->r_ctl.rc_last_us_rtt;
if (rack->r_ctl.fillcw_cap && fill_bw >= rack->r_ctl.fillcw_cap)
fill_bw = rack->r_ctl.fillcw_cap;
at_lt_bw:
if (rack_bw_multipler > 0) {
uint64_t lt_bw, gp, rate;
gp = rack_get_gp_est(rack);
lt_bw = rack_get_lt_bw(rack);
if (lt_bw > gp)
rate = lt_bw;
else
rate = gp;
rate *= rack_bw_multipler;
rate /= 100;
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.flex1 = rack_bw_multipler;
log.u_bbr.flex2 = len;
log.u_bbr.cur_del_rate = gp;
log.u_bbr.delRate = lt_bw;
log.u_bbr.bw_inuse = rate;
log.u_bbr.rttProp = fill_bw;
log.u_bbr.flex8 = 44;
tcp_log_event(rack->rc_tp, NULL, NULL, NULL,
BBR_LOG_CWND, 0,
0, &log, false, NULL,
__func__, __LINE__, &tv);
}
if (fill_bw > rate)
fill_bw = rate;
}
if (non_paced)
*rate_wanted = fill_bw;
if ((fill_bw < RACK_MIN_BW) || (fill_bw < *rate_wanted))
return (pacing_delay);
rack->r_via_fill_cw = 1;
if (rack->r_rack_hw_rate_caps &&
(rack->r_ctl.crte != NULL)) {
uint64_t high_rate;
high_rate = tcp_hw_highest_rate(rack->r_ctl.crte);
if (fill_bw > high_rate) {
if (*rate_wanted > high_rate) {
rack->r_via_fill_cw = 0;
}
rack_log_hdwr_pacing(rack,
fill_bw, high_rate, __LINE__,
0, 3);
fill_bw = high_rate;
if (capped)
*capped = 1;
}
} else if ((rack->r_ctl.crte == NULL) &&
(rack->rack_hdrw_pacing == 0) &&
(rack->rack_hdw_pace_ena) &&
rack->r_rack_hw_rate_caps &&
(rack->rack_attempt_hdwr_pace == 0) &&
(rack->rc_inp->inp_route.ro_nh != NULL) &&
(rack->rc_inp->inp_route.ro_nh->nh_ifp != NULL)) {
uint64_t high_rate;
high_rate = tcp_hw_highest_rate_ifp(rack->rc_inp->inp_route.ro_nh->nh_ifp, rack->rc_inp);
if (high_rate) {
if (fill_bw > high_rate) {
fill_bw = high_rate;
if (capped)
*capped = 1;
}
}
}
if (rack->r_ctl.bw_rate_cap && (fill_bw > rack->r_ctl.bw_rate_cap)) {
rack_log_hybrid_bw(rack, rack->rc_tp->snd_max,
fill_bw, 0, 0, HYBRID_LOG_RATE_CAP, 2, NULL, __LINE__);
fill_bw = rack->r_ctl.bw_rate_cap;
}
lentim = (uint64_t)(len) * (uint64_t)HPTS_USEC_IN_SEC;
lentim /= fill_bw;
*rate_wanted = fill_bw;
if (non_paced || (lentim < pacing_delay)) {
rack_log_pacing_delay_calc(rack, len, pacing_delay, fill_bw,
0, lentim, 12, __LINE__, NULL, 0);
return ((int32_t)lentim);
} else
return (pacing_delay);
}
static int32_t
rack_get_pacing_delay(struct tcp_rack *rack, struct tcpcb *tp, uint32_t len, struct rack_sendmap *rsm, uint32_t segsiz, int line)
{
uint64_t srtt;
int32_t pacing_delay = 0;
int can_start_hw_pacing = 1;
int err;
int pace_one;
if (rack_pace_one_seg ||
(rack->r_ctl.rc_user_set_min_segs == 1))
pace_one = 1;
else
pace_one = 0;
if (rack->rc_always_pace == 0) {
uint64_t cwnd, tr_perms = 0;
int32_t reduce;
old_method:
if (rack->r_ctl.rc_rack_min_rtt)
srtt = rack->r_ctl.rc_rack_min_rtt;
else
srtt = max(tp->t_srtt, 1);
if (rack->r_ctl.rc_rack_largest_cwnd)
cwnd = rack->r_ctl.rc_rack_largest_cwnd;
else
cwnd = rack->r_ctl.cwnd_to_use;
tr_perms = (cwnd * 1000) / srtt;
if (tr_perms == 0) {
tr_perms = ctf_fixed_maxseg(tp);
}
pacing_delay = len / tr_perms;
if (pacing_delay && rack_pacing_delay_reduction) {
reduce = (pacing_delay / rack_pacing_delay_reduction);
if (reduce < pacing_delay) {
pacing_delay -= reduce;
} else
pacing_delay = 0;
} else
reduce = 0;
pacing_delay *= HPTS_USEC_IN_MSEC;
if (rack->rc_pace_to_cwnd) {
uint64_t rate_wanted = 0;
pacing_delay = pace_to_fill_cwnd(rack, pacing_delay, len, segsiz, NULL, &rate_wanted, 1);
rack->rc_ack_can_sendout_data = 1;
rack_log_pacing_delay_calc(rack, len, pacing_delay, rate_wanted, 0, 0, 14, __LINE__, NULL, 0);
} else
rack_log_pacing_delay_calc(rack, len, pacing_delay, tr_perms, reduce, 0, 7, __LINE__, NULL, 0);
} else {
uint64_t bw_est, res, lentim, rate_wanted;
uint32_t segs, oh;
int capped = 0;
int prev_fill;
if ((rack->r_rr_config == 1) && rsm) {
return (rack->r_ctl.rc_min_to);
}
if (rack->use_fixed_rate) {
rate_wanted = bw_est = rack_get_fixed_pacing_bw(rack);
} else if ((rack->r_ctl.init_rate == 0) &&
(rack->r_ctl.gp_bw == 0)) {
bw_est = rate_wanted = 0;
} else if (rack->dgp_on) {
bw_est = rack_get_bw(rack);
rate_wanted = rack_get_output_bw(rack, bw_est, rsm, &capped);
} else {
uint32_t gain, rate_set = 0;
rate_wanted = min(rack->rc_tp->snd_cwnd, rack->r_ctl.cwnd_to_use);
rate_wanted = rack_arrive_at_discounted_rate(rack, rate_wanted, &rate_set, &gain);
if (rate_set == 0) {
if (rate_wanted > rack->rc_tp->snd_wnd)
rate_wanted = rack->rc_tp->snd_wnd;
rate_wanted *= (uint64_t)HPTS_USEC_IN_SEC;
rate_wanted /= (uint64_t)rack->r_ctl.rc_last_us_rtt;
}
bw_est = rate_wanted;
rack_log_pacing_delay_calc(rack, rack->rc_tp->snd_cwnd,
rack->r_ctl.cwnd_to_use,
rate_wanted, bw_est,
rack->r_ctl.rc_last_us_rtt,
88, __LINE__, NULL, gain);
}
if (((bw_est == 0) || (rate_wanted == 0) || (rack->gp_ready == 0)) &&
(rack->use_fixed_rate == 0)) {
goto old_method;
}
rack_rate_cap_bw(rack, &rate_wanted, &capped);
segs = (len + segsiz - 1) / segsiz;
oh = (tp->t_maxseg - segsiz) + sizeof(struct tcphdr);
if (rack->r_is_v6) {
#ifdef INET6
oh += sizeof(struct ip6_hdr);
#endif
} else {
#ifdef INET
oh += sizeof(struct ip);
#endif
}
oh += 14;
segs *= oh;
lentim = (uint64_t)(len + segs) * (uint64_t)HPTS_USEC_IN_SEC;
res = lentim / rate_wanted;
pacing_delay = (uint32_t)res;
if (rack_hw_rate_min &&
(rate_wanted < rack_hw_rate_min)) {
can_start_hw_pacing = 0;
if (rack->r_ctl.crte) {
tcp_rel_pacing_rate(rack->r_ctl.crte, rack->rc_tp);
rack->r_ctl.crte = NULL;
rack->rack_attempt_hdwr_pace = 0;
rack->rack_hdrw_pacing = 0;
}
}
if (rack->r_ctl.crte &&
(tcp_hw_highest_rate(rack->r_ctl.crte) < rate_wanted)) {
can_start_hw_pacing = 0;
if (rack->r_rack_hw_rate_caps == 0) {
tcp_rel_pacing_rate(rack->r_ctl.crte, rack->rc_tp);
rack->r_ctl.crte = NULL;
rack->rack_attempt_hdwr_pace = 0;
rack->rack_hdrw_pacing = 0;
}
}
if ((rack->r_ctl.crte != NULL) && (rack->rc_inp->inp_snd_tag == NULL)) {
tcp_rel_pacing_rate(rack->r_ctl.crte, rack->rc_tp);
rack->r_ctl.crte = NULL;
rack->rack_hdrw_pacing = 0;
rack->rack_attempt_hdwr_pace = 0;
rack_log_hdwr_pacing(rack,
rate_wanted, bw_est, __LINE__,
0, 6);
}
prev_fill = rack->r_via_fill_cw;
if ((rack->rc_pace_to_cwnd) &&
(capped == 0) &&
(rack->dgp_on == 1) &&
(rack->use_fixed_rate == 0) &&
(rack->in_probe_rtt == 0) &&
(IN_FASTRECOVERY(rack->rc_tp->t_flags) == 0)) {
pacing_delay = pace_to_fill_cwnd(rack, pacing_delay, (len+segs), segsiz, &capped, &rate_wanted, 0);
if ((rack->r_ctl.crte != NULL) &&
(tcp_hw_highest_rate(rack->r_ctl.crte) < rate_wanted)) {
can_start_hw_pacing = 0;
if (rack->r_rack_hw_rate_caps == 0) {
tcp_rel_pacing_rate(rack->r_ctl.crte, rack->rc_tp);
rack->r_ctl.crte = NULL;
rack->rack_attempt_hdwr_pace = 0;
rack->rack_hdrw_pacing = 0;
rack_set_pace_segments(rack->rc_tp, rack, __LINE__, NULL);
}
}
}
if ((rack->rc_inp->inp_route.ro_nh != NULL) &&
(rack->rc_inp->inp_route.ro_nh->nh_ifp != NULL)) {
if ((rack->rack_hdw_pace_ena) &&
(can_start_hw_pacing > 0) &&
(rack->rack_hdrw_pacing == 0) &&
(rack->rack_attempt_hdwr_pace == 0)) {
rack->rack_attempt_hdwr_pace = 1;
rack->r_ctl.crte = tcp_set_pacing_rate(rack->rc_tp,
rack->rc_inp->inp_route.ro_nh->nh_ifp,
rate_wanted,
RS_PACING_GEQ,
&err, &rack->r_ctl.crte_prev_rate);
if (rack->r_ctl.crte) {
rack->rack_hdrw_pacing = 1;
rack->r_ctl.rc_pace_max_segs = tcp_get_pacing_burst_size_w_divisor(tp, rate_wanted, segsiz,
pace_one, rack->r_ctl.crte,
NULL, rack->r_ctl.pace_len_divisor);
rack_log_hdwr_pacing(rack,
rate_wanted, rack->r_ctl.crte->rate, __LINE__,
err, 0);
rack->r_ctl.last_hw_bw_req = rate_wanted;
} else {
counter_u64_add(rack_hw_pace_init_fail, 1);
}
} else if (rack->rack_hdrw_pacing &&
(rack->r_ctl.last_hw_bw_req != rate_wanted)) {
const struct tcp_hwrate_limit_table *nrte;
if (rack->r_up_only &&
(rate_wanted < rack->r_ctl.crte->rate)) {
if (!((prev_fill == 1) && (rack->r_via_fill_cw == 0)))
goto done_w_hdwr;
}
if ((rate_wanted > rack->r_ctl.crte->rate) ||
(rate_wanted <= rack->r_ctl.crte_prev_rate)) {
if (rack_hw_rate_to_low &&
(bw_est < rack_hw_rate_to_low)) {
rack_log_hdwr_pacing(rack,
bw_est, rack->r_ctl.crte->rate, __LINE__,
0, 5);
tcp_rel_pacing_rate(rack->r_ctl.crte, rack->rc_tp);
rack->r_ctl.crte = NULL;
rack->rack_attempt_hdwr_pace = 0;
rack->rack_hdrw_pacing = 0;
rack_set_pace_segments(rack->rc_tp, rack, __LINE__, &rate_wanted);
goto done_w_hdwr;
}
nrte = tcp_chg_pacing_rate(rack->r_ctl.crte,
rack->rc_tp,
rack->rc_inp->inp_route.ro_nh->nh_ifp,
rate_wanted,
RS_PACING_GEQ,
&err, &rack->r_ctl.crte_prev_rate);
if (nrte == NULL) {
rack->rack_hdrw_pacing = 0;
rack->r_ctl.crte = NULL;
rack_log_hdwr_pacing(rack,
rate_wanted, 0, __LINE__,
err, 1);
rack_set_pace_segments(rack->rc_tp, rack, __LINE__, &rate_wanted);
counter_u64_add(rack_hw_pace_lost, 1);
} else if (nrte != rack->r_ctl.crte) {
rack->r_ctl.crte = nrte;
rack->r_ctl.rc_pace_max_segs = tcp_get_pacing_burst_size_w_divisor(tp, rate_wanted,
segsiz, pace_one, rack->r_ctl.crte,
NULL, rack->r_ctl.pace_len_divisor);
rack_log_hdwr_pacing(rack,
rate_wanted, rack->r_ctl.crte->rate, __LINE__,
err, 2);
rack->r_ctl.last_hw_bw_req = rate_wanted;
}
} else {
rack_set_pace_segments(rack->rc_tp, rack, __LINE__, &rate_wanted);
rack_log_hdwr_pacing(rack,
rate_wanted, rack->r_ctl.crte->rate, __LINE__,
0, 4);
rack->r_ctl.last_hw_bw_req = rate_wanted;
}
}
}
done_w_hdwr:
if (rack_limit_time_with_srtt &&
(rack->use_fixed_rate == 0) &&
(rack->rack_hdrw_pacing == 0)) {
if (rack->rc_tp->t_srtt)
srtt = rack->rc_tp->t_srtt;
else
srtt = RACK_INITIAL_RTO * HPTS_USEC_IN_MSEC;
if (srtt < (uint64_t)pacing_delay) {
rack_log_pacing_delay_calc(rack, srtt, pacing_delay, rate_wanted, bw_est, lentim, 99, __LINE__, NULL, 0);
pacing_delay = srtt;
}
}
rack_log_pacing_delay_calc(rack, len, pacing_delay, rate_wanted, bw_est, lentim, 2, __LINE__, rsm, 0);
}
if (rack->r_ctl.crte && (rack->r_ctl.crte->rs_num_enobufs > 0)) {
int hw_boost_delay;
hw_boost_delay = rack->r_ctl.crte->time_between * rack_enobuf_hw_boost_mult;
if (hw_boost_delay > rack_enobuf_hw_max)
hw_boost_delay = rack_enobuf_hw_max;
else if (hw_boost_delay < rack_enobuf_hw_min)
hw_boost_delay = rack_enobuf_hw_min;
pacing_delay += hw_boost_delay;
}
return (pacing_delay);
}
static void
rack_start_gp_measurement(struct tcpcb *tp, struct tcp_rack *rack,
tcp_seq startseq, uint32_t sb_offset)
{
struct rack_sendmap *my_rsm = NULL;
if (tp->t_state < TCPS_ESTABLISHED) {
return;
}
if (tp->t_state >= TCPS_FIN_WAIT_1) {
if (sbavail(&tptosocket(tp)->so_snd) <
max(rc_init_window(rack),
(MIN_GP_WIN * ctf_fixed_maxseg(tp)))) {
return;
}
}
tp->t_flags |= TF_GPUTINPROG;
rack->r_ctl.rc_gp_cumack_ts = 0;
rack->r_ctl.rc_gp_lowrtt = 0xffffffff;
rack->r_ctl.rc_gp_high_rwnd = rack->rc_tp->snd_wnd;
tp->gput_seq = startseq;
rack->app_limited_needs_set = 0;
if (rack->in_probe_rtt)
rack->measure_saw_probe_rtt = 1;
else if ((rack->measure_saw_probe_rtt) &&
(SEQ_GEQ(tp->gput_seq, rack->r_ctl.rc_probertt_sndmax_atexit)))
rack->measure_saw_probe_rtt = 0;
if (rack->rc_gp_filled)
tp->gput_ts = rack->r_ctl.last_cumack_advance;
else {
struct timeval tv;
tp->gput_ts = tcp_get_usecs(&tv);
rack->r_ctl.rc_gp_output_ts = rack_to_usec_ts(&tv);
}
if ((rack->rc_gp_filled == 0) && (rack->r_ctl.init_rate == 0)) {
rack->app_limited_needs_set = 1;
tp->gput_ack = startseq + max(rc_init_window(rack),
(MIN_GP_WIN * ctf_fixed_maxseg(tp)));
rack_log_pacing_delay_calc(rack,
tp->gput_seq,
tp->gput_ack,
0,
tp->gput_ts,
(((uint64_t)rack->r_ctl.rc_app_limited_cnt << 32) | (uint64_t)rack->r_ctl.rc_gp_output_ts),
9,
__LINE__, NULL, 0);
rack_tend_gp_marks(tp, rack);
rack_log_gpset(rack, tp->gput_ack, 0, 0, __LINE__, 1, NULL);
return;
}
if (sb_offset) {
if (rack->r_ctl.rc_app_limited_cnt == 0) {
my_rsm = tqhash_min(rack->r_ctl.tqh);
if ((my_rsm == NULL) ||
(my_rsm->r_rtr_cnt != 1)) {
goto use_latest;
}
} else {
if (rack->r_ctl.rc_first_appl == NULL) {
goto use_latest;
}
rack->app_limited_needs_set = 1;
my_rsm = tqhash_next(rack->r_ctl.tqh, rack->r_ctl.rc_first_appl);
if (my_rsm) {
if ((my_rsm->r_end - my_rsm->r_start) <= ctf_fixed_maxseg(tp))
my_rsm = tqhash_next(rack->r_ctl.tqh, my_rsm);
else {
tp->gput_seq = my_rsm->r_start + ctf_fixed_maxseg(tp);
goto start_set;
}
}
if ((my_rsm == NULL) ||
(my_rsm->r_rtr_cnt != 1)) {
goto use_latest;
}
}
tp->gput_seq = my_rsm->r_start;
start_set:
if (my_rsm->r_flags & RACK_ACKED) {
struct rack_sendmap *nrsm;
tp->gput_ts = (uint32_t)my_rsm->r_ack_arrival;
rack->app_limited_needs_set = 0;
tp->gput_seq = my_rsm->r_end;
nrsm = tqhash_next(rack->r_ctl.tqh, my_rsm);
if (nrsm != NULL)
my_rsm = nrsm;
else {
goto use_latest;
}
}
rack->r_ctl.rc_gp_output_ts = my_rsm->r_tim_lastsent[0];
tp->gput_ack = tp->gput_seq + rack_get_measure_window(tp, rack);
rack->r_ctl.rc_gp_cumack_ts = 0;
if ((rack->r_ctl.cleared_app_ack == 1) &&
(SEQ_GEQ(tp->gput_seq, rack->r_ctl.cleared_app_ack_seq))) {
rack->app_limited_needs_set = 1;
rack->r_ctl.cleared_app_ack = 0;
}
rack_log_pacing_delay_calc(rack,
tp->gput_seq,
tp->gput_ack,
(uintptr_t)my_rsm,
tp->gput_ts,
(((uint64_t)rack->r_ctl.rc_app_limited_cnt << 32) | (uint64_t)rack->r_ctl.rc_gp_output_ts),
9,
__LINE__, my_rsm, 0);
rack_tend_gp_marks(tp, rack);
rack_log_gpset(rack, tp->gput_ack, 0, 0, __LINE__, 1, NULL);
return;
}
use_latest:
rack->app_limited_needs_set = 1;
tp->gput_ack = startseq + rack_get_measure_window(tp, rack);
rack->r_ctl.rc_gp_cumack_ts = 0;
my_rsm = tqhash_find(rack->r_ctl.tqh, startseq);
if (my_rsm) {
rack->r_ctl.rc_gp_output_ts = my_rsm->r_tim_lastsent[0];
if (my_rsm->r_flags & RACK_ACKED) {
tp->gput_ts = (uint32_t)my_rsm->r_ack_arrival;
rack->app_limited_needs_set = 0;
}
if (SEQ_LT(my_rsm->r_start, tp->gput_seq)) {
tp->gput_seq = my_rsm->r_start;
}
} else {
struct timeval tv;
microuptime(&tv);
rack->r_ctl.rc_gp_output_ts = rack_to_usec_ts(&tv);
}
rack_tend_gp_marks(tp, rack);
rack_log_pacing_delay_calc(rack,
tp->gput_seq,
tp->gput_ack,
(uintptr_t)my_rsm,
tp->gput_ts,
(((uint64_t)rack->r_ctl.rc_app_limited_cnt << 32) | (uint64_t)rack->r_ctl.rc_gp_output_ts),
9, __LINE__, NULL, 0);
rack_log_gpset(rack, tp->gput_ack, 0, 0, __LINE__, 1, NULL);
}
static inline uint32_t
rack_what_can_we_send(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cwnd_to_use,
uint32_t avail, int32_t sb_offset)
{
uint32_t len;
uint32_t sendwin;
if (tp->snd_wnd > cwnd_to_use)
sendwin = cwnd_to_use;
else
sendwin = tp->snd_wnd;
if (ctf_outstanding(tp) >= tp->snd_wnd) {
len = 0;
} else {
uint32_t flight;
flight = ctf_flight_size(tp, rack->r_ctl.rc_sacked);
if (flight >= sendwin) {
return (0);
}
len = sendwin - flight;
if ((len + ctf_outstanding(tp)) > tp->snd_wnd) {
len = tp->snd_wnd - ctf_outstanding(tp);
}
if ((len + sb_offset) > avail) {
len = avail - sb_offset;
}
}
return (len);
}
static void
rack_log_fsb(struct tcp_rack *rack, struct tcpcb *tp, struct socket *so, uint32_t flags,
unsigned ipoptlen, int32_t orig_len, int32_t len, int error,
int rsm_is_null, int optlen, int line, uint16_t mode)
{
if (rack_verbose_logging && tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.flex1 = error;
log.u_bbr.flex2 = flags;
log.u_bbr.flex3 = rsm_is_null;
log.u_bbr.flex4 = ipoptlen;
log.u_bbr.flex5 = tp->rcv_numsacks;
log.u_bbr.flex6 = rack->r_ctl.rc_agg_early;
log.u_bbr.flex7 = optlen;
log.u_bbr.flex8 = rack->r_fsb_inited;
log.u_bbr.applimited = rack->r_fast_output;
log.u_bbr.bw_inuse = rack_get_bw(rack);
log.u_bbr.pacing_gain = rack_get_output_gain(rack, NULL);
log.u_bbr.cwnd_gain = mode;
log.u_bbr.pkts_out = orig_len;
log.u_bbr.lt_epoch = len;
log.u_bbr.delivered = line;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
tcp_log_event(tp, NULL, &so->so_rcv, &so->so_snd, TCP_LOG_FSB, 0,
len, &log, false, NULL, __func__, __LINE__, &tv);
}
}
static struct mbuf *
rack_fo_base_copym(struct mbuf *the_m, uint32_t the_off, int32_t *plen,
struct rack_fast_send_blk *fsb,
int32_t seglimit, int32_t segsize, int hw_tls)
{
#ifdef KERN_TLS
struct ktls_session *tls, *ntls;
#ifdef INVARIANTS
struct mbuf *start;
#endif
#endif
struct mbuf *m, *n, **np, *smb;
struct mbuf *top;
int32_t off, soff;
int32_t len = *plen;
int32_t fragsize;
int32_t len_cp = 0;
uint32_t mlen, frags;
soff = off = the_off;
smb = m = the_m;
np = ⊤
top = NULL;
#ifdef KERN_TLS
if (hw_tls && (m->m_flags & M_EXTPG))
tls = m->m_epg_tls;
else
tls = NULL;
#ifdef INVARIANTS
start = m;
#endif
#endif
while (len > 0) {
if (m == NULL) {
*plen = len_cp;
break;
}
#ifdef KERN_TLS
if (hw_tls) {
if (m->m_flags & M_EXTPG)
ntls = m->m_epg_tls;
else
ntls = NULL;
if (tls != ntls) {
MPASS(m != start);
*plen = len_cp;
break;
}
}
#endif
mlen = min(len, m->m_len - off);
if (seglimit) {
if (m->m_flags & M_EXTPG) {
fragsize = min(segsize, PAGE_SIZE);
frags = 3;
} else {
fragsize = segsize;
frags = 0;
}
if ((frags + 1) >= seglimit) {
*plen = len_cp;
break;
}
if ((frags + howmany(mlen, fragsize)) >= seglimit) {
mlen = (seglimit - frags - 1) * fragsize;
len = mlen;
*plen = len_cp + len;
}
frags += howmany(mlen, fragsize);
if (frags == 0)
frags++;
seglimit -= frags;
KASSERT(seglimit > 0,
("%s: seglimit went too low", __func__));
}
n = m_get(M_NOWAIT, m->m_type);
*np = n;
if (n == NULL)
goto nospace;
n->m_len = mlen;
soff += mlen;
len_cp += n->m_len;
if (m->m_flags & (M_EXT | M_EXTPG)) {
n->m_data = m->m_data + off;
mb_dupcl(n, m);
} else {
bcopy(mtod(m, caddr_t)+off, mtod(n, caddr_t),
(u_int)n->m_len);
}
len -= n->m_len;
off = 0;
m = m->m_next;
np = &n->m_next;
if (len || (soff == smb->m_len)) {
soff = 0;
smb = m;
}
}
if (fsb != NULL) {
fsb->m = smb;
fsb->off = soff;
if (smb) {
fsb->o_m_len = smb->m_len;
fsb->o_t_len = M_TRAILINGROOM(smb);
} else {
fsb->o_m_len = 0;
fsb->o_t_len = 0;
}
}
return (top);
nospace:
if (top)
m_freem(top);
return (NULL);
}
static struct mbuf *
rack_fo_m_copym(struct tcp_rack *rack, int32_t *plen,
int32_t seglimit, int32_t segsize, struct mbuf **s_mb, int *s_soff)
{
struct mbuf *m, *n;
int32_t soff;
m = rack->r_ctl.fsb.m;
if (M_TRAILINGROOM(m) != rack->r_ctl.fsb.o_t_len) {
KASSERT((rack->r_ctl.fsb.o_t_len > M_TRAILINGROOM(m)),
("mbuf:%p rack:%p trailing_space:%jd ots:%u oml:%u mlen:%u\n",
m,
rack,
(intmax_t)M_TRAILINGROOM(m),
rack->r_ctl.fsb.o_t_len,
rack->r_ctl.fsb.o_m_len,
m->m_len));
rack->r_ctl.fsb.o_m_len += (rack->r_ctl.fsb.o_t_len - M_TRAILINGROOM(m));
rack->r_ctl.fsb.o_t_len = M_TRAILINGROOM(m);
}
if (m->m_len < rack->r_ctl.fsb.o_m_len) {
KASSERT((rack->r_ctl.fsb.off >= (rack->r_ctl.fsb.o_m_len - m->m_len)),
("mbuf:%p len:%u rack:%p oml:%u soff:%u\n",
m, m->m_len,
rack, rack->r_ctl.fsb.o_m_len,
rack->r_ctl.fsb.off));
if (rack->r_ctl.fsb.off >= (rack->r_ctl.fsb.o_m_len- m->m_len))
rack->r_ctl.fsb.off -= (rack->r_ctl.fsb.o_m_len - m->m_len);
else
rack->r_ctl.fsb.off = 0;
rack->r_ctl.fsb.o_m_len = m->m_len;
#ifdef INVARIANTS
} else if (m->m_len > rack->r_ctl.fsb.o_m_len) {
panic("rack:%p m:%p m_len grew outside of t_space compensation",
rack, m);
#endif
}
soff = rack->r_ctl.fsb.off;
KASSERT(soff >= 0, ("%s, negative off %d", __FUNCTION__, soff));
KASSERT(*plen >= 0, ("%s, negative len %d", __FUNCTION__, *plen));
KASSERT(soff < m->m_len, ("%s rack:%p len:%u m:%p m->m_len:%u < off?",
__FUNCTION__,
rack, *plen, m, m->m_len));
*s_soff = soff;
*s_mb = rack->r_ctl.fsb.m;
n = rack_fo_base_copym(m, soff, plen,
&rack->r_ctl.fsb,
seglimit, segsize, rack->r_ctl.fsb.hw_tls);
return (n);
}
static void
rack_log_queue_level(struct tcpcb *tp, struct tcp_rack *rack,
int len, struct timeval *tv,
uint32_t cts)
{
uint32_t p_rate = 0, p_queue = 0, err = 0;
union tcp_log_stackspecific log;
#ifdef RATELIMIT
err = in_pcbquery_txrlevel(rack->rc_inp, &p_queue);
err = in_pcbquery_txrtlmt(rack->rc_inp, &p_rate);
#endif
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.flex1 = p_rate;
log.u_bbr.flex2 = p_queue;
log.u_bbr.flex4 = (uint32_t)rack->r_ctl.crte->using;
log.u_bbr.flex5 = (uint32_t)rack->r_ctl.crte->rs_num_enobufs;
log.u_bbr.flex6 = rack->r_ctl.crte->time_between;
log.u_bbr.flex7 = 99;
log.u_bbr.flex8 = 0;
log.u_bbr.pkts_out = err;
log.u_bbr.delRate = rack->r_ctl.crte->rate;
log.u_bbr.timeStamp = cts;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
tcp_log_event(tp, NULL, NULL, NULL, BBR_LOG_HDWR_PACE, 0,
len, &log, false, NULL, __func__, __LINE__, tv);
}
static uint32_t
rack_check_queue_level(struct tcp_rack *rack, struct tcpcb *tp,
struct timeval *tv, uint32_t cts, int len, uint32_t segsiz)
{
uint64_t lentime = 0;
#ifdef RATELIMIT
uint32_t p_rate = 0, p_queue = 0, err;
union tcp_log_stackspecific log;
uint64_t bw;
err = in_pcbquery_txrlevel(rack->rc_inp, &p_queue);
if (err || (p_queue == 0)) {
lentime = 0;
goto out;
}
err = in_pcbquery_txrtlmt(rack->rc_inp, &p_rate);
if (err) {
lentime = 0;
goto out;
}
bw = p_rate / 8;
if (bw) {
lentime = (rack->r_ctl.rc_pace_max_segs / segsiz);
lentime *= ETHERNET_SEGMENT_SIZE;
lentime *= (uint64_t)HPTS_USEC_IN_SEC;
lentime /= bw;
} else {
lentime = 0;
}
out:
if (tcp_bblogging_on(tp)) {
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
log.u_bbr.flex1 = p_rate;
log.u_bbr.flex2 = p_queue;
log.u_bbr.flex4 = (uint32_t)rack->r_ctl.crte->using;
log.u_bbr.flex5 = (uint32_t)rack->r_ctl.crte->rs_num_enobufs;
log.u_bbr.flex6 = rack->r_ctl.crte->time_between;
log.u_bbr.flex7 = 99;
log.u_bbr.flex8 = 0;
log.u_bbr.pkts_out = err;
log.u_bbr.delRate = rack->r_ctl.crte->rate;
log.u_bbr.cur_del_rate = lentime;
log.u_bbr.timeStamp = cts;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
tcp_log_event(tp, NULL, NULL, NULL, BBR_LOG_HDWR_PACE, 0,
len, &log, false, NULL, __func__, __LINE__,tv);
}
#endif
return ((uint32_t)lentime);
}
static int
rack_fast_rsm_output(struct tcpcb *tp, struct tcp_rack *rack, struct rack_sendmap *rsm,
uint64_t ts_val, uint32_t cts, uint32_t ms_cts, struct timeval *tv, int len, uint8_t doing_tlp)
{
struct ip *ip = NULL;
struct udphdr *udp = NULL;
struct tcphdr *th = NULL;
struct mbuf *m = NULL;
struct inpcb *inp;
uint8_t *cpto;
struct tcp_log_buffer *lgb;
#ifdef TCP_ACCOUNTING
uint64_t crtsc;
int cnt_thru = 1;
#endif
struct tcpopt to;
u_char opt[TCP_MAXOLEN];
uint32_t hdrlen, optlen;
int32_t pacing_delay, segsiz, max_val, tso = 0, error = 0, ulen = 0;
uint16_t flags;
uint32_t if_hw_tsomaxsegcount = 0, startseq;
uint32_t if_hw_tsomaxsegsize;
int32_t ip_sendflag = IP_NO_SND_TAG_RL;
#ifdef INET6
struct ip6_hdr *ip6 = NULL;
if (rack->r_is_v6) {
ip6 = (struct ip6_hdr *)rack->r_ctl.fsb.tcp_ip_hdr;
hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
} else
#endif
{
ip = (struct ip *)rack->r_ctl.fsb.tcp_ip_hdr;
hdrlen = sizeof(struct tcpiphdr);
}
if (tp->t_port && (V_tcp_udp_tunneling_port == 0)) {
goto failed;
}
if (doing_tlp) {
rsm->r_flags |= RACK_TLP;
} else {
rsm->r_flags &= ~RACK_TLP;
}
startseq = rsm->r_start;
segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
inp = rack->rc_inp;
to.to_flags = 0;
flags = tcp_outflags[tp->t_state];
if (flags & (TH_SYN|TH_RST)) {
goto failed;
}
if (rsm->r_flags & RACK_HAS_FIN) {
goto failed;
}
if (flags & TH_FIN) {
flags &= ~TH_FIN;
}
if (tp->t_flags & TF_RCVD_TSTMP) {
to.to_tsval = ms_cts + tp->ts_offset;
to.to_tsecr = tp->ts_recent;
to.to_flags = TOF_TS;
}
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
if (tp->t_flags & TF_SIGNATURE)
to.to_flags |= TOF_SIGNATURE;
#endif
optlen = tcp_addoptions(&to, opt);
hdrlen += optlen;
udp = rack->r_ctl.fsb.udp;
if (udp)
hdrlen += sizeof(struct udphdr);
if (rack->r_ctl.rc_pace_max_segs)
max_val = rack->r_ctl.rc_pace_max_segs;
else if (rack->rc_user_set_max_segs)
max_val = rack->rc_user_set_max_segs * segsiz;
else
max_val = len;
if ((tp->t_flags & TF_TSO) &&
V_tcp_do_tso &&
(len > segsiz) &&
(tp->t_port == 0))
tso = 1;
#ifdef INET6
if (MHLEN < hdrlen + max_linkhdr)
m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
else
#endif
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m == NULL)
goto failed;
m->m_data += max_linkhdr;
m->m_len = hdrlen;
th = rack->r_ctl.fsb.th;
if (len > max_val)
len = max_val;
if ((tso) && (len + optlen > segsiz)) {
uint32_t if_hw_tsomax;
int32_t max_len;
if_hw_tsomax = tp->t_tsomax;
if_hw_tsomaxsegcount = tp->t_tsomaxsegcount;
if_hw_tsomaxsegsize = tp->t_tsomaxsegsize;
if (if_hw_tsomax != 0) {
max_len = (if_hw_tsomax - hdrlen -
max_linkhdr);
if (max_len <= 0) {
goto failed;
} else if (len > max_len) {
len = max_len;
}
}
if (len <= segsiz) {
tso = 0;
}
} else {
tso = 0;
}
if ((tso == 0) && (len > segsiz))
len = segsiz;
(void)tcp_get_usecs(tv);
if ((len == 0) ||
(len <= MHLEN - hdrlen - max_linkhdr)) {
goto failed;
}
th->th_seq = htonl(rsm->r_start);
th->th_ack = htonl(tp->rcv_nxt);
if ((rsm->r_flags & RACK_HAD_PUSH) &&
(len == (rsm->r_end - rsm->r_start)))
flags |= TH_PUSH;
th->th_win = htons((u_short)(rack->r_ctl.fsb.recwin >> tp->rcv_scale));
if (th->th_win == 0) {
tp->t_sndzerowin++;
tp->t_flags |= TF_RXWIN0SENT;
} else
tp->t_flags &= ~TF_RXWIN0SENT;
if (rsm->r_flags & RACK_TLP) {
counter_u64_add(rack_tlp_retran, 1);
counter_u64_add(rack_tlp_retran_bytes, len);
} else {
tp->t_sndrexmitpack++;
KMOD_TCPSTAT_INC(tcps_sndrexmitpack);
KMOD_TCPSTAT_ADD(tcps_sndrexmitbyte, len);
}
#ifdef STATS
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RETXPB,
len);
#endif
if (rsm->m == NULL)
goto failed;
if (rsm->m &&
((rsm->orig_m_len != rsm->m->m_len) ||
(M_TRAILINGROOM(rsm->m) != rsm->orig_t_space))) {
rack_adjust_orig_mlen(rsm);
}
m->m_next = rack_fo_base_copym(rsm->m, rsm->soff, &len, NULL, if_hw_tsomaxsegcount, if_hw_tsomaxsegsize, rsm->r_hw_tls);
if (len <= segsiz) {
tso = 0;
}
if ((m->m_next == NULL) || (len <= 0)){
goto failed;
}
if (udp) {
if (rack->r_is_v6)
ulen = hdrlen + len - sizeof(struct ip6_hdr);
else
ulen = hdrlen + len - sizeof(struct ip);
udp->uh_ulen = htons(ulen);
}
m->m_pkthdr.rcvif = (struct ifnet *)0;
if (TCPS_HAVERCVDSYN(tp->t_state) &&
(tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))) {
int ect = tcp_ecn_output_established(tp, &flags, len, true);
if ((tp->t_state == TCPS_SYN_RECEIVED) &&
(tp->t_flags2 & TF2_ECN_SND_ECE))
tp->t_flags2 &= ~TF2_ECN_SND_ECE;
#ifdef INET6
if (rack->r_is_v6) {
ip6->ip6_flow &= ~htonl(IPTOS_ECN_MASK << 20);
ip6->ip6_flow |= htonl(ect << 20);
}
else
#endif
{
ip->ip_tos &= ~IPTOS_ECN_MASK;
ip->ip_tos |= ect;
}
}
if (rack->r_ctl.crte != NULL) {
pacing_delay = rack_check_queue_level(rack, tp, tv, cts, len, segsiz);
if (pacing_delay == 0)
ip_sendflag = 0;
}
tcp_set_flags(th, flags);
m->m_pkthdr.len = hdrlen + len;
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
if (to.to_flags & TOF_SIGNATURE) {
if (!TCPMD5_ENABLED() || TCPMD5_OUTPUT(m, th,
(u_char *)(th + 1) + (to.to_signature - opt)) != 0) {
goto failed;
}
}
#endif
#ifdef INET6
if (rack->r_is_v6) {
if (tp->t_port) {
m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
udp->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0);
th->th_sum = htons(0);
UDPSTAT_INC(udps_opackets);
} else {
m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
th->th_sum = in6_cksum_pseudo(ip6,
sizeof(struct tcphdr) + optlen + len, IPPROTO_TCP,
0);
}
}
#endif
#if defined(INET6) && defined(INET)
else
#endif
#ifdef INET
{
if (tp->t_port) {
m->m_pkthdr.csum_flags = CSUM_UDP;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
udp->uh_sum = in_pseudo(ip->ip_src.s_addr,
ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP));
th->th_sum = htons(0);
UDPSTAT_INC(udps_opackets);
} else {
m->m_pkthdr.csum_flags = CSUM_TCP;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
th->th_sum = in_pseudo(ip->ip_src.s_addr,
ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) +
IPPROTO_TCP + len + optlen));
}
KASSERT(ip->ip_v == IPVERSION,
("%s: IP version incorrect: %d", __func__, ip->ip_v));
}
#endif
if (tso) {
KASSERT(len > segsiz,
("%s: len <= tso_segsz tp:%p", __func__, tp));
m->m_pkthdr.csum_flags |= CSUM_TSO;
m->m_pkthdr.tso_segsz = segsiz;
}
#ifdef INET6
if (rack->r_is_v6) {
ip6->ip6_hlim = rack->r_ctl.fsb.hoplimit;
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss)
tp->t_flags2 |= TF2_PLPMTU_PMTUD;
else
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
}
#endif
#if defined(INET) && defined(INET6)
else
#endif
#ifdef INET
{
ip->ip_len = htons(m->m_pkthdr.len);
ip->ip_ttl = rack->r_ctl.fsb.hoplimit;
if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss) {
tp->t_flags2 |= TF2_PLPMTU_PMTUD;
if (tp->t_port == 0 || len < V_tcp_minmss) {
ip->ip_off |= htons(IP_DF);
}
} else {
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
}
}
#endif
if (doing_tlp == 0) {
rack->rc_gp_saw_rec = 1;
} else {
if (tp->snd_cwnd > tp->snd_ssthresh) {
rack->rc_gp_saw_ca = 1;
} else {
rack->rc_gp_saw_ss = 1;
}
}
cpto = mtod(m, uint8_t *);
memcpy(cpto, rack->r_ctl.fsb.tcp_ip_hdr, rack->r_ctl.fsb.tcp_ip_hdr_len);
th = (struct tcphdr *)(cpto + ((uint8_t *)rack->r_ctl.fsb.th - rack->r_ctl.fsb.tcp_ip_hdr));
if (optlen) {
bcopy(opt, th + 1, optlen);
th->th_off = (sizeof(struct tcphdr) + optlen) >> 2;
} else {
th->th_off = sizeof(struct tcphdr) >> 2;
}
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
if (rsm->r_flags & RACK_RWND_COLLAPSED) {
rack_log_collapse(rack, rsm->r_start, rsm->r_end, 0, __LINE__, 5, rsm->r_flags, rsm);
counter_u64_add(rack_collapsed_win_rxt, 1);
counter_u64_add(rack_collapsed_win_rxt_bytes, (rsm->r_end - rsm->r_start));
}
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
if (rack->rack_no_prr)
log.u_bbr.flex1 = 0;
else
log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex2 = rack->r_ctl.rc_pace_min_segs;
log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs;
log.u_bbr.flex4 = max_val;
log.u_bbr.flex6 = rack->r_ctl.rc_agg_early;
log.u_bbr.applimited = rack->r_ctl.rc_agg_delayed;
log.u_bbr.bw_inuse = rack_get_bw(rack);
log.u_bbr.cur_del_rate = rack->r_ctl.gp_bw;
if (doing_tlp == 0)
log.u_bbr.flex8 = 1;
else
log.u_bbr.flex8 = 2;
log.u_bbr.pacing_gain = rack_get_output_gain(rack, NULL);
log.u_bbr.flex7 = 55;
log.u_bbr.pkts_out = tp->t_maxseg;
log.u_bbr.timeStamp = cts;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
if (rsm->r_rtr_cnt > 0) {
log.u_bbr.flex5 = rsm->r_fas;
log.u_bbr.bbr_substate = rsm->r_bas;
} else {
log.u_bbr.flex5 = log.u_bbr.inflight;
log.u_bbr.bbr_substate = (uint8_t)((len + segsiz - 1)/segsiz);
}
log.u_bbr.lt_epoch = rack->r_ctl.cwnd_to_use;
log.u_bbr.delivered = 0;
log.u_bbr.rttProp = (uintptr_t)rsm;
log.u_bbr.delRate = rsm->r_flags;
log.u_bbr.delRate <<= 31;
log.u_bbr.delRate |= rack->r_must_retran;
log.u_bbr.delRate <<= 1;
log.u_bbr.delRate |= 1;
log.u_bbr.pkt_epoch = __LINE__;
lgb = tcp_log_event(tp, th, NULL, NULL, TCP_LOG_OUT, ERRNO_UNK,
len, &log, false, NULL, __func__, __LINE__, tv);
} else
lgb = NULL;
if ((rack->r_ctl.crte != NULL) &&
tcp_bblogging_on(tp)) {
rack_log_queue_level(tp, rack, len, tv, cts);
}
#ifdef INET6
if (rack->r_is_v6) {
error = ip6_output(m, inp->in6p_outputopts,
&inp->inp_route6,
ip_sendflag, NULL, NULL, inp);
}
else
#endif
#ifdef INET
{
error = ip_output(m, NULL,
&inp->inp_route,
ip_sendflag, 0, inp);
}
#endif
m = NULL;
if (lgb) {
lgb->tlb_errno = error;
lgb = NULL;
}
tp->snd_nxt = tp->snd_max;
if (error) {
goto failed;
} else if (rack->rc_hw_nobuf && (ip_sendflag != IP_NO_SND_TAG_RL)) {
rack->rc_hw_nobuf = 0;
rack->r_ctl.rc_agg_delayed = 0;
rack->r_early = 0;
rack->r_late = 0;
rack->r_ctl.rc_agg_early = 0;
}
rack_log_output(tp, &to, len, rsm->r_start, flags, error, rack_to_usec_ts(tv),
rsm, RACK_SENT_FP, rsm->m, rsm->soff, rsm->r_hw_tls, segsiz);
if (doing_tlp) {
rack->rc_tlp_in_progress = 1;
rack->r_ctl.rc_tlp_cnt_out++;
}
if (error == 0) {
counter_u64_add(rack_total_bytes, len);
tcp_account_for_send(tp, len, 1, doing_tlp, rsm->r_hw_tls);
if (doing_tlp) {
rack->rc_last_sent_tlp_past_cumack = 0;
rack->rc_last_sent_tlp_seq_valid = 1;
rack->r_ctl.last_sent_tlp_seq = rsm->r_start;
rack->r_ctl.last_sent_tlp_len = rsm->r_end - rsm->r_start;
}
if (rack->r_ctl.rc_prr_sndcnt >= len)
rack->r_ctl.rc_prr_sndcnt -= len;
else
rack->r_ctl.rc_prr_sndcnt = 0;
}
tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
rack->forced_ack = 0;
if (IN_FASTRECOVERY(tp->t_flags) && rsm)
rack->r_ctl.retran_during_recovery += len;
{
int idx;
idx = (len / segsiz) + 3;
if (idx >= TCP_MSS_ACCT_ATIMER)
counter_u64_add(rack_out_size[(TCP_MSS_ACCT_ATIMER-1)], 1);
else
counter_u64_add(rack_out_size[idx], 1);
}
if (tp->t_rtttime == 0) {
tp->t_rtttime = ticks;
tp->t_rtseq = startseq;
KMOD_TCPSTAT_INC(tcps_segstimed);
}
counter_u64_add(rack_fto_rsm_send, 1);
if (error && (error == ENOBUFS)) {
if (rack->r_ctl.crte != NULL) {
tcp_trace_point(rack->rc_tp, TCP_TP_HWENOBUF);
if (tcp_bblogging_on(rack->rc_tp))
rack_log_queue_level(tp, rack, len, tv, cts);
} else
tcp_trace_point(rack->rc_tp, TCP_TP_ENOBUF);
pacing_delay = ((1 + rack->rc_enobuf) * HPTS_USEC_IN_MSEC);
if (rack->rc_enobuf < 0x7f)
rack->rc_enobuf++;
if (pacing_delay < (10 * HPTS_USEC_IN_MSEC))
pacing_delay = 10 * HPTS_USEC_IN_MSEC;
if (rack->r_ctl.crte != NULL) {
counter_u64_add(rack_saw_enobuf_hw, 1);
tcp_rl_log_enobuf(rack->r_ctl.crte);
}
counter_u64_add(rack_saw_enobuf, 1);
} else {
pacing_delay = rack_get_pacing_delay(rack, tp, len, NULL, segsiz, __LINE__);
}
rack_start_hpts_timer(rack, tp, cts, pacing_delay, len, 0);
#ifdef TCP_ACCOUNTING
crtsc = get_cyclecount();
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[SND_OUT_DATA] += cnt_thru;
tp->tcp_proc_time[SND_OUT_DATA] += (crtsc - ts_val);
tp->tcp_cnt_counters[CNT_OF_MSS_OUT] += ((len + segsiz - 1) / segsiz);
}
sched_unpin();
#endif
return (0);
failed:
if (m)
m_free(m);
return (-1);
}
static void
rack_sndbuf_autoscale(struct tcp_rack *rack)
{
struct socket *so;
struct tcpcb *tp;
uint32_t sendwin, scaleup;
tp = rack->rc_tp;
so = rack->rc_inp->inp_socket;
sendwin = min(rack->r_ctl.cwnd_to_use, tp->snd_wnd);
if (V_tcp_do_autosndbuf && so->so_snd.sb_flags & SB_AUTOSIZE) {
if ((tp->snd_wnd / 4 * 5) >= so->so_snd.sb_hiwat &&
sbused(&so->so_snd) >=
(so->so_snd.sb_hiwat / 8 * 7) &&
sbused(&so->so_snd) < V_tcp_autosndbuf_max &&
sendwin >= (sbused(&so->so_snd) -
(tp->snd_max - tp->snd_una))) {
if (rack_autosndbuf_inc)
scaleup = (rack_autosndbuf_inc * so->so_snd.sb_hiwat) / 100;
else
scaleup = V_tcp_autosndbuf_inc;
if (scaleup < V_tcp_autosndbuf_inc)
scaleup = V_tcp_autosndbuf_inc;
scaleup += so->so_snd.sb_hiwat;
if (scaleup > V_tcp_autosndbuf_max)
scaleup = V_tcp_autosndbuf_max;
if (!sbreserve_locked(so, SO_SND, scaleup, curthread))
so->so_snd.sb_flags &= ~SB_AUTOSIZE;
}
}
}
static int
rack_fast_output(struct tcpcb *tp, struct tcp_rack *rack, uint64_t ts_val,
uint32_t cts, uint32_t ms_cts, struct timeval *tv, long *tot_len, int *send_err, int line)
{
#ifdef INET
struct ip *ip = NULL;
#endif
struct udphdr *udp = NULL;
struct tcphdr *th = NULL;
struct mbuf *m, *s_mb;
struct inpcb *inp;
uint8_t *cpto;
struct tcp_log_buffer *lgb;
#ifdef TCP_ACCOUNTING
uint64_t crtsc;
#endif
struct tcpopt to;
u_char opt[TCP_MAXOLEN];
uint32_t hdrlen, optlen;
#ifdef TCP_ACCOUNTING
int cnt_thru = 1;
#endif
int32_t pacing_delay, segsiz, len, max_val, tso = 0, sb_offset, error, ulen = 0;
uint16_t flags;
uint32_t s_soff;
uint32_t if_hw_tsomaxsegcount = 0, startseq;
uint32_t if_hw_tsomaxsegsize;
uint32_t add_flag = RACK_SENT_FP;
#ifdef INET6
struct ip6_hdr *ip6 = NULL;
if (rack->r_is_v6) {
ip6 = (struct ip6_hdr *)rack->r_ctl.fsb.tcp_ip_hdr;
hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
} else
#endif
{
#ifdef INET
ip = (struct ip *)rack->r_ctl.fsb.tcp_ip_hdr;
hdrlen = sizeof(struct tcpiphdr);
#endif
}
if (tp->t_port && (V_tcp_udp_tunneling_port == 0)) {
m = NULL;
goto failed;
}
rack->r_ctl.cwnd_to_use = tp->snd_cwnd;
startseq = tp->snd_max;
segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
inp = rack->rc_inp;
len = rack->r_ctl.fsb.left_to_send;
to.to_flags = 0;
flags = rack->r_ctl.fsb.tcp_flags;
if (tp->t_flags & TF_RCVD_TSTMP) {
to.to_tsval = ms_cts + tp->ts_offset;
to.to_tsecr = tp->ts_recent;
to.to_flags = TOF_TS;
}
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
if (tp->t_flags & TF_SIGNATURE)
to.to_flags |= TOF_SIGNATURE;
#endif
optlen = tcp_addoptions(&to, opt);
hdrlen += optlen;
udp = rack->r_ctl.fsb.udp;
if (udp)
hdrlen += sizeof(struct udphdr);
if (rack->r_ctl.rc_pace_max_segs)
max_val = rack->r_ctl.rc_pace_max_segs;
else if (rack->rc_user_set_max_segs)
max_val = rack->rc_user_set_max_segs * segsiz;
else
max_val = len;
if ((tp->t_flags & TF_TSO) &&
V_tcp_do_tso &&
(len > segsiz) &&
(tp->t_port == 0))
tso = 1;
again:
#ifdef INET6
if (MHLEN < hdrlen + max_linkhdr)
m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
else
#endif
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m == NULL)
goto failed;
m->m_data += max_linkhdr;
m->m_len = hdrlen;
th = rack->r_ctl.fsb.th;
if (len > max_val)
len = max_val;
if ((tso) && (len + optlen > segsiz)) {
uint32_t if_hw_tsomax;
int32_t max_len;
if_hw_tsomax = tp->t_tsomax;
if_hw_tsomaxsegcount = tp->t_tsomaxsegcount;
if_hw_tsomaxsegsize = tp->t_tsomaxsegsize;
if (if_hw_tsomax != 0) {
max_len = (if_hw_tsomax - hdrlen -
max_linkhdr);
if (max_len <= 0) {
goto failed;
} else if (len > max_len) {
len = max_len;
}
}
if (len <= segsiz) {
tso = 0;
}
} else {
tso = 0;
}
if ((tso == 0) && (len > segsiz))
len = segsiz;
(void)tcp_get_usecs(tv);
if ((len == 0) ||
(len <= MHLEN - hdrlen - max_linkhdr)) {
goto failed;
}
sb_offset = tp->snd_max - tp->snd_una;
th->th_seq = htonl(tp->snd_max);
th->th_ack = htonl(tp->rcv_nxt);
th->th_win = htons((u_short)(rack->r_ctl.fsb.recwin >> tp->rcv_scale));
if (th->th_win == 0) {
tp->t_sndzerowin++;
tp->t_flags |= TF_RXWIN0SENT;
} else
tp->t_flags &= ~TF_RXWIN0SENT;
tp->snd_up = tp->snd_una;
KMOD_TCPSTAT_INC(tcps_sndpack);
KMOD_TCPSTAT_ADD(tcps_sndbyte, len);
#ifdef STATS
stats_voi_update_abs_u64(tp->t_stats, VOI_TCP_TXPB,
len);
#endif
if (rack->r_ctl.fsb.m == NULL)
goto failed;
m->m_next = rack_fo_m_copym(rack, &len, if_hw_tsomaxsegcount, if_hw_tsomaxsegsize,
&s_mb, &s_soff);
if (len <= segsiz) {
tso = 0;
}
if (rack->r_ctl.fsb.rfo_apply_push &&
(len == rack->r_ctl.fsb.left_to_send)) {
flags |= TH_PUSH;
add_flag |= RACK_HAD_PUSH;
}
if ((m->m_next == NULL) || (len <= 0)){
goto failed;
}
if (udp) {
if (rack->r_is_v6)
ulen = hdrlen + len - sizeof(struct ip6_hdr);
else
ulen = hdrlen + len - sizeof(struct ip);
udp->uh_ulen = htons(ulen);
}
m->m_pkthdr.rcvif = (struct ifnet *)0;
if (TCPS_HAVERCVDSYN(tp->t_state) &&
(tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))) {
int ect = tcp_ecn_output_established(tp, &flags, len, false);
if ((tp->t_state == TCPS_SYN_RECEIVED) &&
(tp->t_flags2 & TF2_ECN_SND_ECE))
tp->t_flags2 &= ~TF2_ECN_SND_ECE;
#ifdef INET6
if (rack->r_is_v6) {
ip6->ip6_flow &= ~htonl(IPTOS_ECN_MASK << 20);
ip6->ip6_flow |= htonl(ect << 20);
}
else
#endif
{
#ifdef INET
ip->ip_tos &= ~IPTOS_ECN_MASK;
ip->ip_tos |= ect;
#endif
}
}
tcp_set_flags(th, flags);
m->m_pkthdr.len = hdrlen + len;
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
if (to.to_flags & TOF_SIGNATURE) {
if (!TCPMD5_ENABLED() || TCPMD5_OUTPUT(m, th,
(u_char *)(th + 1) + (to.to_signature - opt)) != 0) {
goto failed;
}
}
#endif
#ifdef INET6
if (rack->r_is_v6) {
if (tp->t_port) {
m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
udp->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0);
th->th_sum = htons(0);
UDPSTAT_INC(udps_opackets);
} else {
m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
th->th_sum = in6_cksum_pseudo(ip6,
sizeof(struct tcphdr) + optlen + len, IPPROTO_TCP,
0);
}
}
#endif
#if defined(INET6) && defined(INET)
else
#endif
#ifdef INET
{
if (tp->t_port) {
m->m_pkthdr.csum_flags = CSUM_UDP;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
udp->uh_sum = in_pseudo(ip->ip_src.s_addr,
ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP));
th->th_sum = htons(0);
UDPSTAT_INC(udps_opackets);
} else {
m->m_pkthdr.csum_flags = CSUM_TCP;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
th->th_sum = in_pseudo(ip->ip_src.s_addr,
ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) +
IPPROTO_TCP + len + optlen));
}
KASSERT(ip->ip_v == IPVERSION,
("%s: IP version incorrect: %d", __func__, ip->ip_v));
}
#endif
if (tso) {
KASSERT(len > segsiz,
("%s: len <= tso_segsz tp:%p", __func__, tp));
m->m_pkthdr.csum_flags |= CSUM_TSO;
m->m_pkthdr.tso_segsz = segsiz;
}
#ifdef INET6
if (rack->r_is_v6) {
ip6->ip6_hlim = rack->r_ctl.fsb.hoplimit;
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss)
tp->t_flags2 |= TF2_PLPMTU_PMTUD;
else
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
}
#endif
#if defined(INET) && defined(INET6)
else
#endif
#ifdef INET
{
ip->ip_len = htons(m->m_pkthdr.len);
ip->ip_ttl = rack->r_ctl.fsb.hoplimit;
if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss) {
tp->t_flags2 |= TF2_PLPMTU_PMTUD;
if (tp->t_port == 0 || len < V_tcp_minmss) {
ip->ip_off |= htons(IP_DF);
}
} else {
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
}
}
#endif
if (tp->snd_cwnd > tp->snd_ssthresh) {
rack->rc_gp_saw_ca = 1;
} else {
rack->rc_gp_saw_ss = 1;
}
cpto = mtod(m, uint8_t *);
memcpy(cpto, rack->r_ctl.fsb.tcp_ip_hdr, rack->r_ctl.fsb.tcp_ip_hdr_len);
th = (struct tcphdr *)(cpto + ((uint8_t *)rack->r_ctl.fsb.th - rack->r_ctl.fsb.tcp_ip_hdr));
if (optlen) {
bcopy(opt, th + 1, optlen);
th->th_off = (sizeof(struct tcphdr) + optlen) >> 2;
} else {
th->th_off = sizeof(struct tcphdr) >> 2;
}
if ((rack->r_ctl.crte != NULL) &&
tcp_bblogging_on(tp)) {
rack_log_queue_level(tp, rack, len, tv, cts);
}
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
if (rack->rack_no_prr)
log.u_bbr.flex1 = 0;
else
log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex2 = rack->r_ctl.rc_pace_min_segs;
log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs;
log.u_bbr.flex4 = max_val;
log.u_bbr.flex6 = rack->r_ctl.rc_agg_early;
log.u_bbr.applimited = rack->r_ctl.rc_agg_delayed;
log.u_bbr.bw_inuse = rack_get_bw(rack);
log.u_bbr.cur_del_rate = rack->r_ctl.gp_bw;
log.u_bbr.flex8 = 0;
log.u_bbr.pacing_gain = rack_get_output_gain(rack, NULL);
log.u_bbr.flex7 = 44;
log.u_bbr.pkts_out = tp->t_maxseg;
log.u_bbr.timeStamp = cts;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
log.u_bbr.flex5 = log.u_bbr.inflight;
log.u_bbr.lt_epoch = rack->r_ctl.cwnd_to_use;
log.u_bbr.delivered = rack->r_ctl.fsb.left_to_send;
log.u_bbr.rttProp = 0;
log.u_bbr.delRate = rack->r_must_retran;
log.u_bbr.delRate <<= 1;
log.u_bbr.pkt_epoch = line;
log.u_bbr.flex5 = log.u_bbr.inflight;
log.u_bbr.bbr_substate = (uint8_t)((len + segsiz - 1)/segsiz);
lgb = tcp_log_event(tp, th, NULL, NULL, TCP_LOG_OUT, ERRNO_UNK,
len, &log, false, NULL, __func__, __LINE__, tv);
} else
lgb = NULL;
#ifdef INET6
if (rack->r_is_v6) {
error = ip6_output(m, inp->in6p_outputopts,
&inp->inp_route6,
0, NULL, NULL, inp);
}
#endif
#if defined(INET) && defined(INET6)
else
#endif
#ifdef INET
{
error = ip_output(m, NULL,
&inp->inp_route,
0, 0, inp);
}
#endif
if (lgb) {
lgb->tlb_errno = error;
lgb = NULL;
}
if (error) {
*send_err = error;
m = NULL;
goto failed;
} else if (rack->rc_hw_nobuf) {
rack->rc_hw_nobuf = 0;
rack->r_ctl.rc_agg_delayed = 0;
rack->r_early = 0;
rack->r_late = 0;
rack->r_ctl.rc_agg_early = 0;
}
if ((error == 0) && (rack->lt_bw_up == 0)) {
rack->r_ctl.lt_timemark = tcp_tv_to_lusec(tv);
rack->r_ctl.lt_seq = tp->snd_una;
rack->lt_bw_up = 1;
} else if ((error == 0) &&
(((tp->snd_max + len) - rack->r_ctl.lt_seq) > 0x7fffffff)) {
struct timeval tv;
uint64_t tmark;
rack->r_ctl.lt_bw_bytes += (tp->snd_una - rack->r_ctl.lt_seq);
rack->r_ctl.lt_seq = tp->snd_una;
tmark = tcp_get_u64_usecs(&tv);
if (tmark > rack->r_ctl.lt_timemark) {
rack->r_ctl.lt_bw_time += (tmark - rack->r_ctl.lt_timemark);
rack->r_ctl.lt_timemark = tmark;
}
}
rack_log_output(tp, &to, len, tp->snd_max, flags, error, rack_to_usec_ts(tv),
NULL, add_flag, s_mb, s_soff, rack->r_ctl.fsb.hw_tls, segsiz);
if (tp->snd_una == tp->snd_max) {
rack->r_ctl.rc_tlp_rxt_last_time = cts;
rack_log_progress_event(rack, tp, ticks, PROGRESS_START, __LINE__);
tp->t_acktime = ticks;
}
counter_u64_add(rack_total_bytes, len);
tcp_account_for_send(tp, len, 0, 0, rack->r_ctl.fsb.hw_tls);
rack->forced_ack = 0;
*tot_len += len;
if ((tp->t_flags & TF_GPUTINPROG) == 0)
rack_start_gp_measurement(tp, rack, tp->snd_max, sb_offset);
tp->snd_max += len;
tp->snd_nxt = tp->snd_max;
if (rack->rc_new_rnd_needed) {
rack_new_round_starts(tp, rack, tp->snd_max);
}
{
int idx;
idx = (len / segsiz) + 3;
if (idx >= TCP_MSS_ACCT_ATIMER)
counter_u64_add(rack_out_size[(TCP_MSS_ACCT_ATIMER-1)], 1);
else
counter_u64_add(rack_out_size[idx], 1);
}
if (len <= rack->r_ctl.fsb.left_to_send)
rack->r_ctl.fsb.left_to_send -= len;
else
rack->r_ctl.fsb.left_to_send = 0;
if (rack->r_ctl.fsb.left_to_send < segsiz) {
rack->r_fast_output = 0;
rack->r_ctl.fsb.left_to_send = 0;
SOCK_SENDBUF_LOCK(rack->rc_inp->inp_socket);
rack_sndbuf_autoscale(rack);
SOCK_SENDBUF_UNLOCK(rack->rc_inp->inp_socket);
}
if (tp->t_rtttime == 0) {
tp->t_rtttime = ticks;
tp->t_rtseq = startseq;
KMOD_TCPSTAT_INC(tcps_segstimed);
}
if ((rack->r_ctl.fsb.left_to_send >= segsiz) &&
(max_val > len) &&
(*tot_len < rack->r_ctl.rc_pace_max_segs) &&
(tso == 0)) {
max_val -= len;
len = segsiz;
th = rack->r_ctl.fsb.th;
#ifdef TCP_ACCOUNTING
cnt_thru++;
#endif
goto again;
}
tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
counter_u64_add(rack_fto_send, 1);
pacing_delay = rack_get_pacing_delay(rack, tp, *tot_len, NULL, segsiz, __LINE__);
rack_start_hpts_timer(rack, tp, cts, pacing_delay, *tot_len, 0);
#ifdef TCP_ACCOUNTING
crtsc = get_cyclecount();
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[SND_OUT_DATA] += cnt_thru;
tp->tcp_proc_time[SND_OUT_DATA] += (crtsc - ts_val);
tp->tcp_cnt_counters[CNT_OF_MSS_OUT] += ((*tot_len + segsiz - 1) / segsiz);
}
sched_unpin();
#endif
return (0);
failed:
if (m)
m_free(m);
rack->r_fast_output = 0;
return (-1);
}
static inline void
rack_setup_fast_output(struct tcpcb *tp, struct tcp_rack *rack,
struct sockbuf *sb,
int len, int orig_len, int segsiz, uint32_t pace_max_seg,
bool hw_tls,
uint16_t flags)
{
rack->r_fast_output = 1;
rack->r_ctl.fsb.m = sbsndmbuf(sb, (tp->snd_max - tp->snd_una), &rack->r_ctl.fsb.off);
rack->r_ctl.fsb.o_m_len = rack->r_ctl.fsb.m->m_len;
rack->r_ctl.fsb.o_t_len = M_TRAILINGROOM(rack->r_ctl.fsb.m);
rack->r_ctl.fsb.tcp_flags = flags;
rack->r_ctl.fsb.left_to_send = orig_len - len;
if (rack->r_ctl.fsb.left_to_send < pace_max_seg) {
rack->r_fast_output = 0;
return;
} else {
rack->r_ctl.fsb.left_to_send = rounddown(rack->r_ctl.fsb.left_to_send, pace_max_seg);
}
if (hw_tls)
rack->r_ctl.fsb.hw_tls = 1;
else
rack->r_ctl.fsb.hw_tls = 0;
KASSERT((rack->r_ctl.fsb.left_to_send <= (sbavail(sb) - (tp->snd_max - tp->snd_una))),
("rack:%p left_to_send:%u sbavail:%u out:%u",
rack, rack->r_ctl.fsb.left_to_send, sbavail(sb),
(tp->snd_max - tp->snd_una)));
if (rack->r_ctl.fsb.left_to_send < segsiz)
rack->r_fast_output = 0;
else {
if (rack->r_ctl.fsb.left_to_send == (sbavail(sb) - (tp->snd_max - tp->snd_una)))
rack->r_ctl.fsb.rfo_apply_push = 1;
else
rack->r_ctl.fsb.rfo_apply_push = 0;
}
}
static uint32_t
rack_get_hpts_pacing_min_for_bw(struct tcp_rack *rack, int32_t segsiz)
{
uint64_t min_time;
uint32_t maxlen;
min_time = (uint64_t)get_hpts_min_sleep_time();
maxlen = (uint32_t)((rack->r_ctl.gp_bw * min_time) / (uint64_t)HPTS_USEC_IN_SEC);
maxlen = roundup(maxlen, segsiz);
return (maxlen);
}
static struct rack_sendmap *
rack_check_collapsed(struct tcp_rack *rack, uint32_t cts)
{
struct rack_sendmap *rsm = NULL;
int thresh;
restart:
rsm = tqhash_find(rack->r_ctl.tqh, rack->r_ctl.last_collapse_point);
if ((rsm == NULL) || ((rsm->r_flags & RACK_RWND_COLLAPSED) == 0)) {
rack->r_collapse_point_valid = 0;
return (NULL);
}
if (rsm->r_end > (rack->rc_tp->snd_una + rack->rc_tp->snd_wnd)) {
return (NULL);
}
if (rsm->r_flags & RACK_ACKED) {
rack->r_ctl.last_collapse_point = rsm->r_end;
if (SEQ_GEQ(rack->r_ctl.last_collapse_point,
rack->r_ctl.high_collapse_point)) {
rack->r_collapse_point_valid = 0;
return (NULL);
}
goto restart;
}
thresh = rack_calc_thresh_rack(rack, rack_grab_rtt(rack->rc_tp, rack), cts, __LINE__, 1);
if ((cts - ((uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)])) > thresh) {
rack_log_collapse(rack, rsm->r_start,
(cts - ((uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)])),
thresh, __LINE__, 6, rsm->r_flags, rsm);
return (rsm);
}
rack_log_collapse(rack, rsm->r_start,
(cts - ((uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)])),
thresh, __LINE__, 7, rsm->r_flags, rsm);
return (NULL);
}
static inline void
rack_validate_sizes(struct tcp_rack *rack, int32_t *len, int32_t segsiz, uint32_t pace_max_seg)
{
if ((rack->full_size_rxt == 0) &&
(rack->shape_rxt_to_pacing_min == 0) &&
(*len >= segsiz)) {
*len = segsiz;
} else if (rack->shape_rxt_to_pacing_min &&
rack->gp_ready) {
uint32_t maxlen;
maxlen = rack_get_hpts_pacing_min_for_bw(rack, segsiz);
if (*len > maxlen)
*len = maxlen;
} else {
if (*len > pace_max_seg)
*len = pace_max_seg;
}
}
static int
rack_output(struct tcpcb *tp)
{
struct socket *so;
uint32_t recwin;
uint32_t sb_offset, s_moff = 0;
int32_t len, error = 0;
uint16_t flags;
struct mbuf *m, *s_mb = NULL;
struct mbuf *mb;
uint32_t if_hw_tsomaxsegcount = 0;
uint32_t if_hw_tsomaxsegsize;
int32_t segsiz, minseg;
long tot_len_this_send = 0;
#ifdef INET
struct ip *ip = NULL;
#endif
struct udphdr *udp = NULL;
struct tcp_rack *rack;
struct tcphdr *th;
uint8_t pass = 0;
uint8_t mark = 0;
uint8_t check_done = 0;
uint8_t wanted_cookie = 0;
u_char opt[TCP_MAXOLEN];
unsigned ipoptlen, optlen, hdrlen, ulen=0;
uint32_t rack_seq;
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
unsigned ipsec_optlen = 0;
#endif
int32_t idle, sendalot;
uint32_t tot_idle;
int32_t sub_from_prr = 0;
volatile int32_t sack_rxmit;
struct rack_sendmap *rsm = NULL;
int32_t tso, mtu;
struct tcpopt to;
int32_t pacing_delay = 0;
int32_t sup_rack = 0;
uint32_t cts, ms_cts, delayed, early;
uint32_t add_flag = RACK_SENT_SP;
uint8_t doing_tlp = 0;
uint32_t cwnd_to_use, pace_max_seg;
int32_t do_a_prefetch = 0;
int32_t prefetch_rsm = 0;
int32_t orig_len = 0;
struct timeval tv;
int32_t prefetch_so_done = 0;
struct tcp_log_buffer *lgb;
struct inpcb *inp = tptoinpcb(tp);
struct sockbuf *sb;
uint64_t ts_val = 0;
#ifdef TCP_ACCOUNTING
uint64_t crtsc;
#endif
#ifdef INET6
struct ip6_hdr *ip6 = NULL;
int32_t isipv6;
#endif
bool hpts_calling, hw_tls = false;
NET_EPOCH_ASSERT();
INP_WLOCK_ASSERT(inp);
rack = (struct tcp_rack *)tp->t_fb_ptr;
#ifdef TCP_ACCOUNTING
sched_pin();
ts_val = get_cyclecount();
#endif
hpts_calling = !!(tp->t_flags2 & TF2_HPTS_CALLS);
tp->t_flags2 &= ~TF2_HPTS_CALLS;
#ifdef TCP_OFFLOAD
if (tp->t_flags & TF_TOE) {
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (tcp_offload_output(tp));
}
#endif
if (rack->rack_deferred_inited == 0) {
rack_deferred_init(tp, rack);
}
if ((tp->t_flags & TF_FASTOPEN) &&
(tp->t_state == TCPS_SYN_RECEIVED) &&
SEQ_GT(tp->snd_max, tp->snd_una) &&
(rack->r_ctl.rc_resend == NULL)) {
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (0);
}
#ifdef INET6
if (rack->r_state) {
isipv6 = rack->r_is_v6;
} else {
isipv6 = (rack->rc_inp->inp_vflag & INP_IPV6) != 0;
}
#endif
early = 0;
cts = tcp_get_usecs(&tv);
ms_cts = tcp_tv_to_msec(&tv);
if (((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) &&
tcp_in_hpts(rack->rc_tp)) {
rack_timer_cancel(tp, rack, cts, __LINE__);
}
if ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
TSTMP_GEQ(cts, rack->r_ctl.rc_last_output_to)) {
delayed = cts - rack->r_ctl.rc_last_output_to;
} else {
delayed = 0;
}
if (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) {
int retval;
retval = rack_process_timers(tp, rack, cts, hpts_calling,
&doing_tlp);
if (retval != 0) {
counter_u64_add(rack_out_size[TCP_MSS_ACCT_ATIMER], 1);
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (retval < 0 ? retval : 0);
}
}
if (rack->rc_in_persist) {
if (tcp_in_hpts(rack->rc_tp) == 0) {
rack_start_hpts_timer(rack, tp, cts, 0, 0, 0);
}
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (0);
}
if ((rack->rc_ack_required == 1) &&
(rack->r_timer_override == 0)){
if (tcp_in_hpts(rack->rc_tp) == 0) {
rack_start_hpts_timer(rack, tp, cts, 0, 0, 0);
}
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (0);
}
if ((rack->r_timer_override) ||
(rack->rc_ack_can_sendout_data) ||
(delayed) ||
(tp->t_state < TCPS_ESTABLISHED)) {
rack->rc_ack_can_sendout_data = 0;
if (tcp_in_hpts(rack->rc_tp))
tcp_hpts_remove(rack->rc_tp);
} else if (tcp_in_hpts(rack->rc_tp)) {
#ifdef TCP_ACCOUNTING
crtsc = get_cyclecount();
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_proc_time[SND_BLOCKED] += (crtsc - ts_val);
tp->tcp_cnt_counters[SND_BLOCKED]++;
}
sched_unpin();
#endif
counter_u64_add(rack_out_size[TCP_MSS_ACCT_INPACE], 1);
return (0);
}
if ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
TSTMP_GT(rack->r_ctl.rc_last_output_to, cts)) {
early = rack->r_ctl.rc_last_output_to - cts;
} else
early = 0;
if (delayed && (rack->rc_always_pace == 1)) {
rack->r_ctl.rc_agg_delayed += delayed;
rack->r_late = 1;
} else if (early && (rack->rc_always_pace == 1)) {
rack->r_ctl.rc_agg_early += early;
rack->r_early = 1;
} else if (rack->rc_always_pace == 0) {
rack->r_ctl.rc_agg_delayed = rack->r_ctl.rc_agg_early = 0;
rack->r_early = rack->r_late = 0;
}
rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
rack->r_wanted_output = 0;
rack->r_timer_override = 0;
if ((tp->t_state != rack->r_state) &&
TCPS_HAVEESTABLISHED(tp->t_state)) {
rack_set_state(tp, rack);
}
segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
minseg = segsiz;
if (rack->r_ctl.rc_pace_max_segs == 0)
pace_max_seg = rack->rc_user_set_max_segs * segsiz;
else
pace_max_seg = rack->r_ctl.rc_pace_max_segs;
if ((rack->r_fast_output) &&
(doing_tlp == 0) &&
(tp->rcv_numsacks == 0)) {
int ret;
error = 0;
ret = rack_fast_output(tp, rack, ts_val, cts, ms_cts, &tv, &tot_len_this_send, &error, __LINE__);
if (ret > 0)
return(ret);
else if (error) {
inp = rack->rc_inp;
so = inp->inp_socket;
sb = &so->so_snd;
goto nomore;
} else {
if (tot_len_this_send >= pace_max_seg)
return (ret);
#ifdef TCP_ACCOUNTING
sched_pin();
ts_val = get_cyclecount();
#endif
}
}
inp = rack->rc_inp;
if ((tp->t_flags & TF_FASTOPEN) &&
((tp->t_state == TCPS_SYN_RECEIVED) ||
(tp->t_state == TCPS_SYN_SENT)) &&
SEQ_GT(tp->snd_max, tp->snd_una) &&
(tp->t_rxtshift == 0)) {
rack_start_hpts_timer(rack, tp, cts, 0, 0, 0);
#ifdef TCP_ACCOUNTING
sched_unpin();
#endif
return (0);
}
idle = (tp->t_flags & TF_LASTIDLE) || (tp->snd_max == tp->snd_una);
if (tp->t_idle_reduce) {
if (idle && (TICKS_2_USEC(ticks - tp->t_rcvtime) >= tp->t_rxtcur))
rack_cc_after_idle(rack, tp);
}
tp->t_flags &= ~TF_LASTIDLE;
if (idle) {
if (tp->t_flags & TF_MORETOCOME) {
tp->t_flags |= TF_LASTIDLE;
idle = 0;
}
}
if ((tp->snd_una == tp->snd_max) &&
rack->r_ctl.rc_went_idle_time &&
(cts > rack->r_ctl.rc_went_idle_time)) {
tot_idle = (cts - rack->r_ctl.rc_went_idle_time);
if (tot_idle > rack_min_probertt_hold) {
if (rack->in_probe_rtt == 0) {
rack->r_ctl.rc_lower_rtt_us_cts = cts;
rack->r_ctl.rc_time_probertt_entered = rack->r_ctl.rc_lower_rtt_us_cts;
rack->r_ctl.rc_time_probertt_starts = rack->r_ctl.rc_lower_rtt_us_cts;
rack->r_ctl.rc_time_of_last_probertt = rack->r_ctl.rc_lower_rtt_us_cts;
} else {
rack_exit_probertt(rack, cts);
}
}
} else
tot_idle = 0;
if (rack_use_fsb &&
(rack->r_ctl.fsb.tcp_ip_hdr) &&
(rack->r_fsb_inited == 0) &&
(rack->r_state != TCPS_CLOSED))
rack_init_fsb_block(tp, rack, tcp_outflags[tp->t_state]);
if (rack->rc_sendvars_notset == 1) {
rack->rc_sendvars_notset = 0;
tcp_timer_stop(tp);
}
if ((rack->rack_no_prr == 1) &&
(rack->rc_always_pace == 0)) {
rack->rack_no_prr = 0;
}
if ((rack->pcm_enabled == 1) &&
(rack->pcm_needed == 0) &&
(tot_idle > 0)) {
uint32_t rtts_idle, rnds;
if (tp->t_srtt)
rtts_idle = tot_idle / tp->t_srtt;
else
rtts_idle = 0;
rnds = rack->r_ctl.current_round - rack->r_ctl.last_pcm_round;
rack->r_ctl.pcm_idle_rounds += rtts_idle;
if ((rnds + rack->r_ctl.pcm_idle_rounds) >= rack_pcm_every_n_rounds) {
rack->pcm_needed = 1;
rack_log_pcm(rack, 8, rack->r_ctl.last_pcm_round, rtts_idle, rack->r_ctl.current_round );
}
}
again:
sendalot = 0;
cts = tcp_get_usecs(&tv);
ms_cts = tcp_tv_to_msec(&tv);
tso = 0;
mtu = 0;
if (TCPS_HAVEESTABLISHED(tp->t_state) &&
(rack->r_ctl.pcm_max_seg == 0)) {
rack->r_ctl.pcm_max_seg = rc_init_window(rack);
if (rack->r_ctl.pcm_max_seg < (ctf_fixed_maxseg(tp) * 10)) {
rack->r_ctl.pcm_max_seg = ctf_fixed_maxseg(tp) * 10;
}
}
if ((rack->r_ctl.pcm_max_seg != 0) && (rack->pcm_needed == 1)) {
uint32_t rw_avail, cwa;
if (tp->snd_wnd > ctf_outstanding(tp))
rw_avail = tp->snd_wnd - ctf_outstanding(tp);
else
rw_avail = 0;
if (tp->snd_cwnd > ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked))
cwa = tp->snd_cwnd -ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
else
cwa = 0;
if ((cwa >= rack->r_ctl.pcm_max_seg) &&
(rw_avail > rack->r_ctl.pcm_max_seg)) {
pace_max_seg = rack->r_ctl.pcm_max_seg;
rack->r_fast_output = 0;
}
if (rack_verbose_logging) {
rack_log_pcm(rack, 4,
cwa, rack->r_ctl.pcm_max_seg, rw_avail);
}
}
sb_offset = tp->snd_max - tp->snd_una;
cwnd_to_use = rack->r_ctl.cwnd_to_use = tp->snd_cwnd;
flags = tcp_outflags[tp->t_state];
while (rack->rc_free_cnt < rack_free_cache) {
rsm = rack_alloc(rack);
if (rsm == NULL) {
if (hpts_calling)
pacing_delay = (1 * HPTS_USEC_IN_MSEC);
so = inp->inp_socket;
sb = &so->so_snd;
goto just_return_nolock;
}
TAILQ_INSERT_TAIL(&rack->r_ctl.rc_free, rsm, r_tnext);
rack->rc_free_cnt++;
rsm = NULL;
}
sack_rxmit = 0;
len = 0;
rsm = NULL;
if (flags & TH_RST) {
SOCK_SENDBUF_LOCK(inp->inp_socket);
so = inp->inp_socket;
sb = &so->so_snd;
goto send;
}
if (rack->r_ctl.rc_resend) {
rsm = rack->r_ctl.rc_resend;
rack->r_ctl.rc_resend = NULL;
len = rsm->r_end - rsm->r_start;
sack_rxmit = 1;
sendalot = 0;
KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start),
("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p",
__func__, __LINE__,
rsm->r_start, tp->snd_una, tp, rack, rsm));
sb_offset = rsm->r_start - tp->snd_una;
rack_validate_sizes(rack, &len, segsiz, pace_max_seg);
} else if (rack->r_collapse_point_valid &&
((rsm = rack_check_collapsed(rack, cts)) != NULL)) {
tcp_trace_point(rack->rc_tp, TCP_TP_COLLAPSED_RXT);
rack->r_ctl.last_collapse_point = rsm->r_end;
if (SEQ_GEQ(rack->r_ctl.last_collapse_point,
rack->r_ctl.high_collapse_point))
rack->r_collapse_point_valid = 0;
sack_rxmit = 1;
doing_tlp = 0;
len = rsm->r_end - rsm->r_start;
sb_offset = rsm->r_start - tp->snd_una;
sendalot = 0;
rack_validate_sizes(rack, &len, segsiz, pace_max_seg);
} else if ((rsm = tcp_rack_output(tp, rack, cts)) != NULL) {
if ((!IN_FASTRECOVERY(tp->t_flags)) &&
((rsm->r_flags & RACK_MUST_RXT) == 0) &&
((tp->t_flags & TF_WASFRECOVERY) == 0)) {
rack_cong_signal(tp, CC_NDUPACK, tp->snd_una, __LINE__);
}
#ifdef INVARIANTS
if (SEQ_LT(rsm->r_start, tp->snd_una)) {
panic("Huh, tp:%p rack:%p rsm:%p start:%u < snd_una:%u\n",
tp, rack, rsm, rsm->r_start, tp->snd_una);
}
#endif
len = rsm->r_end - rsm->r_start;
KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start),
("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p",
__func__, __LINE__,
rsm->r_start, tp->snd_una, tp, rack, rsm));
sb_offset = rsm->r_start - tp->snd_una;
sendalot = 0;
rack_validate_sizes(rack, &len, segsiz, pace_max_seg);
if (len > 0) {
sack_rxmit = 1;
KMOD_TCPSTAT_INC(tcps_sack_rexmits);
KMOD_TCPSTAT_ADD(tcps_sack_rexmit_bytes,
min(len, segsiz));
}
} else if (rack->r_ctl.rc_tlpsend) {
long cwin;
long tlen;
rsm = rack->r_ctl.rc_tlpsend;
rsm->r_flags |= RACK_TLP;
rack->r_ctl.rc_tlpsend = NULL;
sack_rxmit = 1;
tlen = rsm->r_end - rsm->r_start;
if (tlen > segsiz)
tlen = segsiz;
KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start),
("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p",
__func__, __LINE__,
rsm->r_start, tp->snd_una, tp, rack, rsm));
sb_offset = rsm->r_start - tp->snd_una;
cwin = min(tp->snd_wnd, tlen);
len = cwin;
}
if (rack->r_must_retran &&
(doing_tlp == 0) &&
(SEQ_GT(tp->snd_max, tp->snd_una)) &&
(rsm == NULL)) {
int sendwin, flight;
sendwin = min(tp->snd_wnd, tp->snd_cwnd);
flight = ctf_flight_size(tp, rack->r_ctl.rc_out_at_rto);
if (flight >= sendwin) {
so = inp->inp_socket;
sb = &so->so_snd;
goto just_return_nolock;
}
rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
if (rsm == NULL) {
rack->r_must_retran = 0;
rack->r_ctl.rc_out_at_rto = 0;
so = inp->inp_socket;
sb = &so->so_snd;
goto just_return_nolock;
}
if ((rsm->r_flags & RACK_MUST_RXT) == 0) {
rack->r_must_retran = 0;
rack->r_ctl.rc_out_at_rto = 0;
rsm = NULL;
sack_rxmit = 0;
} else {
sack_rxmit = 1;
len = rsm->r_end - rsm->r_start;
sb_offset = rsm->r_start - tp->snd_una;
sendalot = 0;
if ((rack->full_size_rxt == 0) &&
(rack->shape_rxt_to_pacing_min == 0) &&
(len >= segsiz))
len = segsiz;
else if (rack->shape_rxt_to_pacing_min &&
rack->gp_ready) {
uint32_t maxlen;
maxlen = rack_get_hpts_pacing_min_for_bw(rack, segsiz);
if (len > maxlen)
len = maxlen;
}
}
}
if ((rsm == NULL) &&
(V_tcp_map_entries_limit > 0) &&
(rack->r_ctl.rc_num_maps_alloced >= V_tcp_map_entries_limit)) {
counter_u64_add(rack_to_alloc_limited, 1);
if (!rack->alloc_limit_reported) {
rack->alloc_limit_reported = 1;
counter_u64_add(rack_alloc_limited_conns, 1);
}
so = inp->inp_socket;
sb = &so->so_snd;
goto just_return_nolock;
}
if (rsm && (rsm->r_flags & RACK_HAS_FIN)) {
len--;
if (len) {
flags &= ~TH_FIN;
}
}
if (rsm && rack->r_fsb_inited &&
rack_use_rsm_rfo &&
((rsm->r_flags & RACK_HAS_FIN) == 0)) {
int ret;
ret = rack_fast_rsm_output(tp, rack, rsm, ts_val, cts, ms_cts, &tv, len, doing_tlp);
if (ret == 0)
return (0);
}
so = inp->inp_socket;
sb = &so->so_snd;
if (do_a_prefetch == 0) {
kern_prefetch(sb, &do_a_prefetch);
do_a_prefetch = 1;
}
#ifdef NETFLIX_SHARED_CWND
if ((tp->t_flags2 & TF2_TCP_SCWND_ALLOWED) &&
rack->rack_enable_scwnd) {
if (rack->gp_ready &&
(rack->rack_attempted_scwnd == 0) &&
(rack->r_ctl.rc_scw == NULL) &&
tp->t_lib) {
counter_u64_add(rack_try_scwnd, 1);
rack->rack_attempted_scwnd = 1;
rack->r_ctl.rc_scw = tcp_shared_cwnd_alloc(tp,
&rack->r_ctl.rc_scw_index,
segsiz);
}
if (rack->r_ctl.rc_scw &&
(rack->rack_scwnd_is_idle == 1) &&
sbavail(&so->so_snd)) {
tcp_shared_cwnd_active(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
rack->rack_scwnd_is_idle = 0;
}
if (rack->r_ctl.rc_scw) {
rack->r_ctl.cwnd_to_use = cwnd_to_use = tcp_shared_cwnd_update(rack->r_ctl.rc_scw,
rack->r_ctl.rc_scw_index,
tp->snd_cwnd, tp->snd_wnd, segsiz);
}
}
#endif
if (tp->t_flags & TF_NEEDFIN)
flags |= TH_FIN;
if (tp->t_flags & TF_NEEDSYN)
flags |= TH_SYN;
if ((sack_rxmit == 0) && (prefetch_rsm == 0)) {
void *end_rsm;
end_rsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_tmap, rack_sendmap, r_tnext);
if (end_rsm)
kern_prefetch(end_rsm, &prefetch_rsm);
prefetch_rsm = 1;
}
SOCK_SENDBUF_LOCK(so);
if ((sack_rxmit == 0) &&
(TCPS_HAVEESTABLISHED(tp->t_state) ||
(tp->t_flags & TF_FASTOPEN))) {
uint32_t avail;
avail = sbavail(sb);
if (SEQ_GT(tp->snd_max, tp->snd_una) && avail)
sb_offset = tp->snd_max - tp->snd_una;
else
sb_offset = 0;
if ((IN_FASTRECOVERY(tp->t_flags) == 0) || rack->rack_no_prr) {
if (rack->r_ctl.rc_tlp_new_data) {
if (rack->r_ctl.rc_tlp_new_data > (uint32_t) (avail - sb_offset)) {
rack->r_ctl.rc_tlp_new_data = (uint32_t) (avail - sb_offset);
}
if ((rack->r_ctl.rc_tlp_new_data + sb_offset) > tp->snd_wnd) {
if (tp->snd_wnd > sb_offset)
len = tp->snd_wnd - sb_offset;
else
len = 0;
} else {
len = rack->r_ctl.rc_tlp_new_data;
}
rack->r_ctl.rc_tlp_new_data = 0;
} else {
len = rack_what_can_we_send(tp, rack, cwnd_to_use, avail, sb_offset);
}
if ((rack->r_ctl.crte == NULL) &&
IN_FASTRECOVERY(tp->t_flags) &&
(rack->full_size_rxt == 0) &&
(rack->shape_rxt_to_pacing_min == 0) &&
(len > segsiz)) {
len = segsiz;
} else if (rack->shape_rxt_to_pacing_min &&
rack->gp_ready) {
uint32_t maxlen;
maxlen = rack_get_hpts_pacing_min_for_bw(rack, segsiz);
if (len > maxlen)
len = maxlen;
}
} else {
uint32_t outstanding;
outstanding = tp->snd_max - tp->snd_una;
if ((rack->r_ctl.rc_prr_sndcnt + outstanding) > tp->snd_wnd) {
if (tp->snd_wnd > outstanding) {
len = tp->snd_wnd - outstanding;
if ((sb_offset + len) > avail) {
if (avail > sb_offset)
len = avail - sb_offset;
else
len = 0;
}
} else {
len = 0;
}
} else if (avail > sb_offset) {
len = avail - sb_offset;
} else {
len = 0;
}
if (len > 0) {
if (len > rack->r_ctl.rc_prr_sndcnt) {
len = rack->r_ctl.rc_prr_sndcnt;
}
if (len > 0) {
sub_from_prr = 1;
}
}
if (len > segsiz) {
if (rack->r_ctl.rc_prr_sendalot == 0) {
len = segsiz;
}
} else if (len < segsiz) {
long leftinsb;
leftinsb = sbavail(sb) - sb_offset;
if (leftinsb > len) {
len = 0;
}
}
}
} else if (!TCPS_HAVEESTABLISHED(tp->t_state)) {
if ((sack_rxmit == 0) &&
!(tp->t_flags & TF_FASTOPEN)) {
len = 0;
sb_offset = 0;
}
}
if (prefetch_so_done == 0) {
kern_prefetch(so, &prefetch_so_done);
prefetch_so_done = 1;
}
orig_len = len;
if ((flags & TH_SYN) &&
SEQ_GT(tp->snd_max, tp->snd_una) &&
((sack_rxmit == 0) &&
(tp->t_rxtshift == 0))) {
if ((tp->t_flags & TF_FASTOPEN) &&
(tp->t_state == TCPS_SYN_RECEIVED))
flags &= ~TH_SYN;
}
if ((flags & TH_SYN) && (tp->t_flags & TF_NOOPT)) {
len = 0;
flags &= ~TH_FIN;
}
if ((tp->t_flags & TF_FASTOPEN) &&
(((flags & TH_SYN) && (tp->t_rxtshift > 0)) ||
((tp->t_state == TCPS_SYN_SENT) &&
(tp->t_tfo_client_cookie_len == 0)) ||
(flags & TH_RST))) {
sack_rxmit = 0;
len = 0;
}
if ((flags & TH_SYN) && !(tp->t_flags & TF_FASTOPEN)) {
len = 0;
}
if ((len > segsiz) && (tcp_dsack_block_exists(tp))) {
add_flag |= RACK_SENT_W_DSACK;
len = segsiz;
}
if (len <= 0) {
len = 0;
if ((tp->snd_wnd == 0) &&
(TCPS_HAVEESTABLISHED(tp->t_state)) &&
(tp->snd_una == tp->snd_max) &&
(sb_offset < (int)sbavail(sb))) {
rack_enter_persist(tp, rack, cts, tp->snd_una);
}
} else if ((rsm == NULL) &&
(doing_tlp == 0) &&
(len < pace_max_seg)) {
if ((tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), minseg)) &&
(TCPS_HAVEESTABLISHED(tp->t_state)) &&
(len < minseg) &&
(len < (int)(sbavail(sb) - sb_offset))) {
len = 0;
if (tp->snd_max == tp->snd_una) {
rack_enter_persist(tp, rack, cts, tp->snd_una);
}
} else if ((cwnd_to_use >= max(minseg, (segsiz * 4))) &&
(ctf_flight_size(tp, rack->r_ctl.rc_sacked) > (2 * segsiz)) &&
(len < (int)(sbavail(sb) - sb_offset)) &&
(len < minseg)) {
len = 0;
} else if (((tp->snd_wnd - ctf_outstanding(tp)) <
min((rack->r_ctl.rc_high_rwnd/2), minseg)) &&
(ctf_flight_size(tp, rack->r_ctl.rc_sacked) > (2 * segsiz)) &&
(len < (int)(sbavail(sb) - sb_offset)) &&
(TCPS_HAVEESTABLISHED(tp->t_state))) {
len = 0;
} else if ((rack->r_ctl.crte != NULL) &&
(tp->snd_wnd >= (pace_max_seg * max(1, rack_hw_rwnd_factor))) &&
(cwnd_to_use >= (pace_max_seg + (4 * segsiz))) &&
(ctf_flight_size(tp, rack->r_ctl.rc_sacked) >= (2 * segsiz)) &&
(len < (int)(sbavail(sb) - sb_offset))) {
len = 0;
}
}
KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__));
rack_sndbuf_autoscale(rack);
ipoptlen = 0;
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
#ifdef INET6
if (isipv6 && IPSEC_ENABLED(ipv6))
ipsec_optlen = IPSEC_HDRSIZE(ipv6, inp);
#ifdef INET
else
#endif
#endif
#ifdef INET
if (IPSEC_ENABLED(ipv4))
ipsec_optlen = IPSEC_HDRSIZE(ipv4, inp);
#endif
#endif
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
ipoptlen += ipsec_optlen;
#endif
if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && len > segsiz &&
(tp->t_port == 0) &&
((tp->t_flags & TF_SIGNATURE) == 0) &&
sack_rxmit == 0 &&
ipoptlen == 0)
tso = 1;
{
uint32_t outstanding __unused;
outstanding = tp->snd_max - tp->snd_una;
if (tp->t_flags & TF_SENTFIN) {
outstanding--;
}
if (sack_rxmit) {
if ((rsm->r_flags & RACK_HAS_FIN) == 0)
flags &= ~TH_FIN;
}
}
recwin = lmin(lmax(sbspace(&so->so_rcv), 0),
(long)TCP_MAXWIN << tp->rcv_scale);
if (len) {
if (len >= segsiz) {
goto send;
}
if (!(tp->t_flags & TF_MORETOCOME) &&
(idle || (tp->t_flags & TF_NODELAY)) &&
((uint32_t)len + (uint32_t)sb_offset >= sbavail(sb)) &&
(tp->t_flags & TF_NOPUSH) == 0) {
pass = 2;
goto send;
}
if ((tp->snd_una == tp->snd_max) && len) {
pass = 22;
goto send;
}
if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) {
pass = 4;
goto send;
}
if (sack_rxmit) {
pass = 6;
goto send;
}
if (((tp->snd_wnd - ctf_outstanding(tp)) < segsiz) &&
(ctf_outstanding(tp) < (segsiz * 2))) {
pass = 12;
goto send;
}
}
if (recwin > 0 && !(tp->t_flags & TF_NEEDSYN) &&
!(tp->t_flags & TF_DELACK) &&
!TCPS_HAVERCVDFIN(tp->t_state)) {
int32_t adv;
int oldwin;
adv = recwin;
if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt)) {
oldwin = (tp->rcv_adv - tp->rcv_nxt);
if (adv > oldwin)
adv -= oldwin;
else {
adv = 0;
}
} else
oldwin = 0;
if (oldwin >> tp->rcv_scale >= (adv + oldwin) >> tp->rcv_scale)
goto dontupdate;
if (adv >= (int32_t)(2 * segsiz) &&
(adv >= (int32_t)(so->so_rcv.sb_hiwat / 4) ||
recwin <= (int32_t)(so->so_rcv.sb_hiwat / 8) ||
so->so_rcv.sb_hiwat <= 8 * segsiz)) {
pass = 7;
goto send;
}
if (2 * adv >= (int32_t) so->so_rcv.sb_hiwat) {
pass = 23;
goto send;
}
}
dontupdate:
if (tp->t_flags & TF_ACKNOW) {
pass = 8;
goto send;
}
if (((flags & TH_SYN) && (tp->t_flags & TF_NEEDSYN) == 0)) {
pass = 9;
goto send;
}
if ((flags & TH_FIN) &&
(tp->snd_max == tp->snd_una)) {
pass = 11;
goto send;
}
just_return:
SOCK_SENDBUF_UNLOCK(so);
just_return_nolock:
{
int app_limited = CTF_JR_SENT_DATA;
if ((tp->t_flags & TF_FASTOPEN) == 0 &&
(flags & TH_FIN) &&
(len == 0) &&
(sbused(sb) == (tp->snd_max - tp->snd_una)) &&
((tp->snd_max - tp->snd_una) <= segsiz)) {
uint64_t tmark;
tmark = tcp_get_u64_usecs(&tv);
if ((tmark > rack->r_ctl.lt_timemark) &&
(((tmark - rack->r_ctl.lt_timemark) / 1000) > tp->t_srtt)) {
rack_send_ack_challange(rack);
}
}
if (tot_len_this_send > 0) {
rack->r_ctl.fsb.recwin = recwin;
pacing_delay = rack_get_pacing_delay(rack, tp, tot_len_this_send, NULL, segsiz, __LINE__);
if ((error == 0) &&
rack_use_rfo &&
((flags & (TH_SYN|TH_FIN)) == 0) &&
(ipoptlen == 0) &&
rack->r_fsb_inited &&
TCPS_HAVEESTABLISHED(tp->t_state) &&
((IN_RECOVERY(tp->t_flags)) == 0) &&
(doing_tlp == 0) &&
(rack->r_must_retran == 0) &&
((tp->t_flags & TF_NEEDFIN) == 0) &&
(len > 0) && (orig_len > 0) &&
(orig_len > len) &&
((orig_len - len) >= segsiz) &&
((optlen == 0) ||
((optlen == TCPOLEN_TSTAMP_APPA) && (to.to_flags & TOF_TS)))) {
rack_setup_fast_output(tp, rack, sb, len, orig_len,
segsiz, pace_max_seg, hw_tls, flags);
} else
rack->r_fast_output = 0;
rack_log_fsb(rack, tp, so, flags,
ipoptlen, orig_len, len, 0,
1, optlen, __LINE__, 1);
if (SEQ_GT(tp->snd_max, tp->snd_nxt))
tp->snd_nxt = tp->snd_max;
} else {
int end_window = 0;
uint32_t seq = tp->gput_ack;
rsm = tqhash_max(rack->r_ctl.tqh);
if (rsm) {
rsm->r_just_ret = 1;
}
counter_u64_add(rack_out_size[TCP_MSS_ACCT_JUSTRET], 1);
rack->r_ctl.rc_agg_delayed = 0;
rack->r_early = 0;
rack->r_late = 0;
rack->r_ctl.rc_agg_early = 0;
if ((ctf_outstanding(tp) +
min(max(segsiz, (rack->r_ctl.rc_high_rwnd/2)),
minseg)) >= tp->snd_wnd) {
app_limited = CTF_JR_RWND_LIMITED;
if (IN_FASTRECOVERY(tp->t_flags))
rack->r_ctl.rc_prr_sndcnt = 0;
} else if (ctf_outstanding(tp) >= sbavail(sb)) {
app_limited = CTF_JR_APP_LIMITED;
if (IN_FASTRECOVERY(tp->t_flags))
rack->r_ctl.rc_prr_sndcnt = 0;
} else if ((idle == 0) &&
((tp->t_flags & TF_NODELAY) == 0) &&
((uint32_t)len + (uint32_t)sb_offset >= sbavail(sb)) &&
(len < segsiz)) {
app_limited = CTF_JR_APP_LIMITED;
} else if (tp->t_flags & TF_NOPUSH) {
app_limited = CTF_JR_APP_LIMITED;
} else if ((ctf_outstanding(tp) + minseg) > cwnd_to_use) {
app_limited = CTF_JR_CWND_LIMITED;
} else if (IN_FASTRECOVERY(tp->t_flags) &&
(rack->rack_no_prr == 0) &&
(rack->r_ctl.rc_prr_sndcnt < segsiz)) {
app_limited = CTF_JR_PRR;
} else {
#ifdef NOW
#ifdef INVARIANTS
panic("rack:%p hit JR_ASSESSING case cwnd_to_use:%u?", rack, cwnd_to_use);
#endif
#endif
app_limited = CTF_JR_ASSESSING;
}
if (rack_cwnd_block_ends_measure &&
((app_limited == CTF_JR_CWND_LIMITED) ||
(app_limited == CTF_JR_PRR))) {
end_window = 1;
} else if (rack_rwnd_block_ends_measure &&
(app_limited == CTF_JR_RWND_LIMITED)) {
end_window = 1;
} else if (app_limited == CTF_JR_APP_LIMITED) {
end_window = 1;
} else if (app_limited == CTF_JR_ASSESSING) {
end_window = 1;
}
if (end_window) {
uint8_t log = 0;
if ((tp->t_flags & TF_GPUTINPROG) &&
SEQ_GT(tp->gput_ack, tp->snd_max)) {
tp->gput_ack = tp->snd_max;
if ((tp->gput_ack - tp->gput_seq) < (MIN_GP_WIN * segsiz)) {
tp->t_flags &= ~TF_GPUTINPROG;
rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) ,
rack->r_ctl.rc_gp_srtt ,
tp->gput_seq,
0, 0, 18, __LINE__, NULL, 0);
} else
log = 1;
}
rsm = tqhash_max(rack->r_ctl.tqh);
if (rsm && ((rsm->r_flags & RACK_APP_LIMITED) == 0)) {
if (rack->r_ctl.rc_app_limited_cnt == 0)
rack->r_ctl.rc_end_appl = rack->r_ctl.rc_first_appl = rsm;
else {
if (rack->r_ctl.rc_end_appl)
rack->r_ctl.rc_end_appl->r_nseq_appl = rsm->r_start;
rack->r_ctl.rc_end_appl = rsm;
}
rsm->r_flags |= RACK_APP_LIMITED;
rack->r_ctl.rc_app_limited_cnt++;
}
if (log)
rack_log_pacing_delay_calc(rack,
rack->r_ctl.rc_app_limited_cnt, seq,
tp->gput_ack, 0, 0, 4, __LINE__, NULL, 0);
}
}
if ((tp->snd_max == tp->snd_una) &&
TCPS_HAVEESTABLISHED(tp->t_state) &&
sbavail(sb) &&
(sbavail(sb) > tp->snd_wnd) &&
(tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), minseg))) {
rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime, tp->snd_una);
}
rack_start_hpts_timer(rack, tp, cts, pacing_delay, tot_len_this_send, sup_rack);
rack_log_type_just_return(rack, cts, tot_len_this_send, pacing_delay, hpts_calling, app_limited, cwnd_to_use);
}
#ifdef NETFLIX_SHARED_CWND
if ((sbavail(sb) == 0) &&
rack->r_ctl.rc_scw) {
tcp_shared_cwnd_idle(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
rack->rack_scwnd_is_idle = 1;
}
#endif
#ifdef TCP_ACCOUNTING
if (tot_len_this_send > 0) {
crtsc = get_cyclecount();
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[SND_OUT_DATA]++;
tp->tcp_proc_time[SND_OUT_DATA] += (crtsc - ts_val);
tp->tcp_cnt_counters[CNT_OF_MSS_OUT] += ((tot_len_this_send + segsiz - 1) / segsiz);
}
} else {
crtsc = get_cyclecount();
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[SND_LIMITED]++;
tp->tcp_proc_time[SND_LIMITED] += (crtsc - ts_val);
}
}
sched_unpin();
#endif
return (0);
send:
if ((rack->r_ctl.crte != NULL) &&
(rsm == NULL) &&
((rack->rc_hw_nobuf == 1) ||
(rack_hw_check_queue && (check_done == 0)))) {
check_done = 1;
pacing_delay = rack_check_queue_level(rack, tp, &tv, cts, len, segsiz);
if (pacing_delay) {
rack->r_ctl.rc_agg_delayed = 0;
rack->r_ctl.rc_agg_early = 0;
rack->r_early = 0;
rack->r_late = 0;
SOCK_SENDBUF_UNLOCK(so);
goto skip_all_send;
}
}
if (rsm || sack_rxmit)
counter_u64_add(rack_nfto_resend, 1);
else
counter_u64_add(rack_non_fto_send, 1);
if ((flags & TH_FIN) &&
sbavail(sb)) {
flags &= ~TH_FIN;
if (TCPS_HAVEESTABLISHED(tp->t_state) &&
(sbused(sb) == (tp->snd_max - tp->snd_una)) &&
((tp->snd_max - tp->snd_una) <= segsiz)) {
rack_send_ack_challange(rack);
}
}
if (pace_max_seg &&
(len > pace_max_seg)) {
mark = 1;
len = pace_max_seg;
}
if ((rsm == NULL) &&
(rack->pcm_in_progress == 0) &&
(rack->r_ctl.pcm_max_seg > 0) &&
(len >= rack->r_ctl.pcm_max_seg)) {
add_flag |= RACK_IS_PCM;
rack_log_pcm(rack, 5, len, rack->r_ctl.pcm_max_seg, add_flag);
} else if (rack_verbose_logging) {
rack_log_pcm(rack, 6, len, rack->r_ctl.pcm_max_seg, add_flag);
}
SOCKBUF_LOCK_ASSERT(sb);
if (len > 0) {
if (len >= segsiz)
tp->t_flags2 |= TF2_PLPMTU_MAXSEGSNT;
else
tp->t_flags2 &= ~TF2_PLPMTU_MAXSEGSNT;
}
optlen = 0;
#ifdef INET6
if (isipv6)
hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
else
#endif
hdrlen = sizeof(struct tcpiphdr);
if (rsm == NULL) {
if (flags & TH_SYN)
rack_seq = tp->iss;
else if ((flags & TH_FIN) &&
(tp->t_flags & TF_SENTFIN))
rack_seq = tp->snd_max - 1;
else
rack_seq = tp->snd_max;
} else {
rack_seq = rsm->r_start;
}
to.to_flags = 0;
if ((tp->t_flags & TF_NOOPT) == 0) {
if (flags & TH_SYN) {
to.to_mss = tcp_mssopt(&inp->inp_inc);
if (tp->t_port)
to.to_mss -= V_tcp_udp_tunneling_overhead;
to.to_flags |= TOF_MSS;
if ((tp->t_flags & TF_FASTOPEN) &&
(tp->t_rxtshift == 0)) {
if (tp->t_state == TCPS_SYN_RECEIVED) {
to.to_tfo_len = TCP_FASTOPEN_COOKIE_LEN;
to.to_tfo_cookie =
(u_int8_t *)&tp->t_tfo_cookie.server;
to.to_flags |= TOF_FASTOPEN;
wanted_cookie = 1;
} else if (tp->t_state == TCPS_SYN_SENT) {
to.to_tfo_len =
tp->t_tfo_client_cookie_len;
to.to_tfo_cookie =
tp->t_tfo_cookie.client;
to.to_flags |= TOF_FASTOPEN;
wanted_cookie = 1;
sendalot = 0;
}
}
}
if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) {
to.to_wscale = tp->request_r_scale;
to.to_flags |= TOF_SCALE;
}
if ((tp->t_flags & TF_RCVD_TSTMP) ||
((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) {
uint32_t ts_to_use;
if ((rack->r_rcvpath_rtt_up == 1) &&
(ms_cts == rack->r_ctl.last_rcv_tstmp_for_rtt)) {
ts_to_use = ms_cts + 1;
} else {
ts_to_use = ms_cts;
}
to.to_tsval = ts_to_use + tp->ts_offset;
to.to_tsecr = tp->ts_recent;
to.to_flags |= TOF_TS;
if ((len == 0) &&
(tp->t_state == TCPS_ESTABLISHED) &&
((ms_cts - rack->r_ctl.last_rcv_tstmp_for_rtt) > RCV_PATH_RTT_MS) &&
(tp->snd_una == tp->snd_max) &&
(flags & TH_ACK) &&
(sbavail(sb) == 0) &&
(rack->r_ctl.current_round != 0) &&
((flags & (TH_SYN|TH_FIN)) == 0) &&
(rack->r_rcvpath_rtt_up == 0)) {
rack->r_ctl.last_rcv_tstmp_for_rtt = ms_cts;
rack->r_ctl.last_time_of_arm_rcv = cts;
rack->r_rcvpath_rtt_up = 1;
rack_seq--;
}
}
if (tp->rfbuf_ts == 0 &&
(so->so_rcv.sb_flags & SB_AUTOSIZE)) {
tp->rfbuf_ts = ms_cts;
}
if (tp->t_flags & TF_SACK_PERMIT) {
if (flags & TH_SYN)
to.to_flags |= TOF_SACKPERM;
else if (TCPS_HAVEESTABLISHED(tp->t_state) &&
tp->rcv_numsacks > 0) {
to.to_flags |= TOF_SACK;
to.to_nsacks = tp->rcv_numsacks;
to.to_sacks = (u_char *)tp->sackblks;
}
}
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
if (tp->t_flags & TF_SIGNATURE)
to.to_flags |= TOF_SIGNATURE;
#endif
hdrlen += optlen = tcp_addoptions(&to, opt);
if ((tp->t_flags & TF_FASTOPEN) && wanted_cookie &&
!(to.to_flags & TOF_FASTOPEN))
len = 0;
}
if (tp->t_port) {
if (V_tcp_udp_tunneling_port == 0) {
SOCK_SENDBUF_UNLOCK(so);
#ifdef TCP_ACCOUNTING
crtsc = get_cyclecount();
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[SND_OUT_FAIL]++;
tp->tcp_proc_time[SND_OUT_FAIL] += (crtsc - ts_val);
}
sched_unpin();
#endif
return (EHOSTUNREACH);
}
hdrlen += sizeof(struct udphdr);
}
#ifdef INET6
if (isipv6)
ipoptlen = ip6_optlen(inp);
else
#endif
if (inp->inp_options)
ipoptlen = inp->inp_options->m_len -
offsetof(struct ipoption, ipopt_list);
else
ipoptlen = 0;
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
ipoptlen += ipsec_optlen;
#endif
if (len + optlen + ipoptlen > tp->t_maxseg) {
if (tso) {
uint32_t if_hw_tsomax;
uint32_t moff;
int32_t max_len;
if_hw_tsomax = tp->t_tsomax;
if_hw_tsomaxsegcount = tp->t_tsomaxsegcount;
if_hw_tsomaxsegsize = tp->t_tsomaxsegsize;
KASSERT(ipoptlen == 0,
("%s: TSO can't do IP options", __func__));
if (if_hw_tsomax != 0) {
max_len = (if_hw_tsomax - hdrlen -
max_linkhdr);
if (max_len <= 0) {
len = 0;
} else if (len > max_len) {
if (doing_tlp == 0)
sendalot = 1;
len = max_len;
mark = 2;
}
}
max_len = (tp->t_maxseg - optlen);
if ((sb_offset + len) < sbavail(sb)) {
moff = len % (u_int)max_len;
if (moff != 0) {
mark = 3;
len -= moff;
}
}
if (len <= max_len) {
mark = 4;
tso = 0;
}
if (tp->t_flags & TF_NEEDFIN) {
sendalot = 4;
}
} else {
mark = 5;
if (optlen + ipoptlen >= tp->t_maxseg) {
SOCK_SENDBUF_UNLOCK(so);
error = EMSGSIZE;
sack_rxmit = 0;
goto out;
}
len = tp->t_maxseg - optlen - ipoptlen;
sendalot = 5;
}
} else {
tso = 0;
mark = 6;
}
KASSERT(len + hdrlen + ipoptlen <= IP_MAXPACKET,
("%s: len > IP_MAXPACKET", __func__));
#ifdef DIAGNOSTIC
#ifdef INET6
if (max_linkhdr + hdrlen > MCLBYTES)
#else
if (max_linkhdr + hdrlen > MHLEN)
#endif
panic("tcphdr too big");
#endif
KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__));
if ((len == 0) &&
(flags & TH_FIN) &&
(sbused(sb))) {
if ((sbused(sb) == (tp->snd_max - tp->snd_una)) &&
((tp->snd_max - tp->snd_una) <= segsiz)) {
rack_send_ack_challange(rack);
}
goto just_return;
}
hw_tls = tp->t_nic_ktls_xmit != 0;
if (len) {
uint32_t max_val;
uint32_t moff;
if (pace_max_seg)
max_val = pace_max_seg;
else
max_val = len;
if (len > max_val) {
mark = 7;
len = max_val;
}
#ifdef INET6
if (MHLEN < hdrlen + max_linkhdr)
m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
else
#endif
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m == NULL) {
SOCK_SENDBUF_UNLOCK(so);
error = ENOBUFS;
sack_rxmit = 0;
goto out;
}
m->m_data += max_linkhdr;
m->m_len = hdrlen;
mb = sbsndptr_noadv(sb, sb_offset, &moff);
s_mb = mb;
s_moff = moff;
if (len <= MHLEN - hdrlen - max_linkhdr && !hw_tls) {
m_copydata(mb, moff, (int)len,
mtod(m, caddr_t)+hdrlen);
if (rsm == NULL)
sbsndptr_adv(sb, mb, len);
m->m_len += len;
} else {
struct sockbuf *msb;
if (rsm == NULL)
msb = sb;
else
msb = NULL;
m->m_next = tcp_m_copym(
mb, moff, &len,
if_hw_tsomaxsegcount, if_hw_tsomaxsegsize, msb,
((rsm == NULL) ? hw_tls : 0));
if (len <= (tp->t_maxseg - optlen)) {
tso = 0;
}
if (m->m_next == NULL) {
SOCK_SENDBUF_UNLOCK(so);
(void)m_free(m);
error = ENOBUFS;
sack_rxmit = 0;
goto out;
}
}
if (sack_rxmit) {
if (rsm && (rsm->r_flags & RACK_TLP)) {
counter_u64_add(rack_tlp_retran, 1);
counter_u64_add(rack_tlp_retran_bytes, len);
} else {
tp->t_sndrexmitpack++;
KMOD_TCPSTAT_INC(tcps_sndrexmitpack);
KMOD_TCPSTAT_ADD(tcps_sndrexmitbyte, len);
}
#ifdef STATS
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RETXPB,
len);
#endif
} else {
KMOD_TCPSTAT_INC(tcps_sndpack);
KMOD_TCPSTAT_ADD(tcps_sndbyte, len);
#ifdef STATS
stats_voi_update_abs_u64(tp->t_stats, VOI_TCP_TXPB,
len);
#endif
}
if (sb_offset + len == sbused(sb) &&
sbused(sb) &&
!(flags & TH_SYN)) {
flags |= TH_PUSH;
add_flag |= RACK_HAD_PUSH;
}
SOCK_SENDBUF_UNLOCK(so);
} else {
SOCK_SENDBUF_UNLOCK(so);
if (tp->t_flags & TF_ACKNOW)
KMOD_TCPSTAT_INC(tcps_sndacks);
else if (flags & (TH_SYN | TH_FIN | TH_RST))
KMOD_TCPSTAT_INC(tcps_sndctrl);
else
KMOD_TCPSTAT_INC(tcps_sndwinup);
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m == NULL) {
error = ENOBUFS;
sack_rxmit = 0;
goto out;
}
#ifdef INET6
if (isipv6 && (MHLEN < hdrlen + max_linkhdr) &&
MHLEN >= hdrlen) {
M_ALIGN(m, hdrlen);
} else
#endif
m->m_data += max_linkhdr;
m->m_len = hdrlen;
}
SOCK_SENDBUF_UNLOCK_ASSERT(so);
m->m_pkthdr.rcvif = (struct ifnet *)0;
#ifdef MAC
mac_inpcb_create_mbuf(inp, m);
#endif
if ((ipoptlen == 0) && (rack->r_ctl.fsb.tcp_ip_hdr) && rack->r_fsb_inited) {
#ifdef INET6
if (isipv6)
ip6 = (struct ip6_hdr *)rack->r_ctl.fsb.tcp_ip_hdr;
else
#endif
#ifdef INET
ip = (struct ip *)rack->r_ctl.fsb.tcp_ip_hdr;
#endif
th = rack->r_ctl.fsb.th;
udp = rack->r_ctl.fsb.udp;
if (udp) {
#ifdef INET6
if (isipv6)
ulen = hdrlen + len - sizeof(struct ip6_hdr);
else
#endif
ulen = hdrlen + len - sizeof(struct ip);
udp->uh_ulen = htons(ulen);
}
} else {
#ifdef INET6
if (isipv6) {
ip6 = mtod(m, struct ip6_hdr *);
if (tp->t_port) {
udp = (struct udphdr *)((caddr_t)ip6 + sizeof(struct ip6_hdr));
udp->uh_sport = htons(V_tcp_udp_tunneling_port);
udp->uh_dport = tp->t_port;
ulen = hdrlen + len - sizeof(struct ip6_hdr);
udp->uh_ulen = htons(ulen);
th = (struct tcphdr *)(udp + 1);
} else
th = (struct tcphdr *)(ip6 + 1);
tcpip_fillheaders(inp, tp->t_port, ip6, th);
} else
#endif
{
#ifdef INET
ip = mtod(m, struct ip *);
if (tp->t_port) {
udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
udp->uh_sport = htons(V_tcp_udp_tunneling_port);
udp->uh_dport = tp->t_port;
ulen = hdrlen + len - sizeof(struct ip);
udp->uh_ulen = htons(ulen);
th = (struct tcphdr *)(udp + 1);
} else
th = (struct tcphdr *)(ip + 1);
tcpip_fillheaders(inp, tp->t_port, ip, th);
#endif
}
}
if (tp->t_state == TCPS_SYN_SENT && V_tcp_do_ecn) {
flags |= tcp_ecn_output_syn_sent(tp);
}
if (TCPS_HAVERCVDSYN(tp->t_state) &&
(tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))) {
int ect = tcp_ecn_output_established(tp, &flags, len, sack_rxmit);
if ((tp->t_state == TCPS_SYN_RECEIVED) &&
(tp->t_flags2 & TF2_ECN_SND_ECE))
tp->t_flags2 &= ~TF2_ECN_SND_ECE;
#ifdef INET6
if (isipv6) {
ip6->ip6_flow &= ~htonl(IPTOS_ECN_MASK << 20);
ip6->ip6_flow |= htonl(ect << 20);
}
else
#endif
{
#ifdef INET
ip->ip_tos &= ~IPTOS_ECN_MASK;
ip->ip_tos |= ect;
#endif
}
}
th->th_seq = htonl(rack_seq);
th->th_ack = htonl(tp->rcv_nxt);
tcp_set_flags(th, flags);
if (flags & TH_RST) {
recwin = 0;
} else {
if (recwin < (long)(so->so_rcv.sb_hiwat / 4) &&
recwin < (long)segsiz) {
recwin = 0;
}
if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) &&
recwin < (long)(tp->rcv_adv - tp->rcv_nxt))
recwin = (long)(tp->rcv_adv - tp->rcv_nxt);
}
if (flags & TH_SYN)
th->th_win = htons((u_short)
(min(sbspace(&so->so_rcv), TCP_MAXWIN)));
else {
recwin = roundup2(recwin, 1 << tp->rcv_scale);
th->th_win = htons((u_short)(recwin >> tp->rcv_scale));
}
if (th->th_win == 0) {
tp->t_sndzerowin++;
tp->t_flags |= TF_RXWIN0SENT;
} else
tp->t_flags &= ~TF_RXWIN0SENT;
tp->snd_up = tp->snd_una;
if ((ipoptlen == 0) && (rack->r_ctl.fsb.tcp_ip_hdr) && rack->r_fsb_inited) {
uint8_t *cpto;
cpto = mtod(m, uint8_t *);
memcpy(cpto, rack->r_ctl.fsb.tcp_ip_hdr, rack->r_ctl.fsb.tcp_ip_hdr_len);
#ifdef INET6
if (isipv6)
ip6 = mtod(m, struct ip6_hdr *);
else
#endif
#ifdef INET
ip = mtod(m, struct ip *);
#endif
th = (struct tcphdr *)(cpto + ((uint8_t *)rack->r_ctl.fsb.th - rack->r_ctl.fsb.tcp_ip_hdr));
if (udp)
udp = (struct udphdr *)(cpto + ((uint8_t *)rack->r_ctl.fsb.udp - rack->r_ctl.fsb.tcp_ip_hdr));
}
if (optlen) {
bcopy(opt, th + 1, optlen);
th->th_off = (sizeof(struct tcphdr) + optlen) >> 2;
}
m->m_pkthdr.len = hdrlen + len;
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
if (to.to_flags & TOF_SIGNATURE) {
if (!TCPMD5_ENABLED() || TCPMD5_OUTPUT(m, th,
(u_char *)(th + 1) + (to.to_signature - opt)) != 0) {
goto out;
}
}
#endif
#ifdef INET6
if (isipv6) {
if (tp->t_port) {
m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
udp->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0);
th->th_sum = htons(0);
UDPSTAT_INC(udps_opackets);
} else {
m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
th->th_sum = in6_cksum_pseudo(ip6,
sizeof(struct tcphdr) + optlen + len, IPPROTO_TCP,
0);
}
}
#endif
#if defined(INET6) && defined(INET)
else
#endif
#ifdef INET
{
if (tp->t_port) {
m->m_pkthdr.csum_flags = CSUM_UDP;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
udp->uh_sum = in_pseudo(ip->ip_src.s_addr,
ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP));
th->th_sum = htons(0);
UDPSTAT_INC(udps_opackets);
} else {
m->m_pkthdr.csum_flags = CSUM_TCP;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
th->th_sum = in_pseudo(ip->ip_src.s_addr,
ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) +
IPPROTO_TCP + len + optlen));
}
KASSERT(ip->ip_v == IPVERSION,
("%s: IP version incorrect: %d", __func__, ip->ip_v));
}
#endif
if (tso) {
KASSERT(len > tp->t_maxseg - optlen,
("%s: len <= tso_segsz", __func__));
m->m_pkthdr.csum_flags |= CSUM_TSO;
m->m_pkthdr.tso_segsz = tp->t_maxseg - optlen;
}
KASSERT(len + hdrlen == m_length(m, NULL),
("%s: mbuf chain different than expected: %d + %u != %u",
__func__, len, hdrlen, m_length(m, NULL)));
#ifdef TCP_HHOOK
hhook_run_tcp_est_out(tp, th, &to, len, tso);
#endif
if ((rack->r_ctl.crte != NULL) &&
(rack->rc_hw_nobuf == 0) &&
tcp_bblogging_on(tp)) {
rack_log_queue_level(tp, rack, len, &tv, cts);
}
if (tcp_bblogging_on(rack->rc_tp)) {
union tcp_log_stackspecific log;
memset(&log, 0, sizeof(log));
log.u_bbr.inhpts = tcp_in_hpts(rack->rc_tp);
if (rack->rack_no_prr)
log.u_bbr.flex1 = 0;
else
log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex2 = rack->r_ctl.rc_pace_min_segs;
log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs;
log.u_bbr.flex4 = orig_len;
log.u_bbr.flex6 = rack->r_ctl.rc_agg_early;
log.u_bbr.applimited = rack->r_ctl.rc_agg_delayed;
log.u_bbr.bw_inuse = rack_get_bw(rack);
log.u_bbr.cur_del_rate = rack->r_ctl.gp_bw;
log.u_bbr.flex8 = 0;
if (rsm) {
if (rsm->r_flags & RACK_RWND_COLLAPSED) {
rack_log_collapse(rack, rsm->r_start, rsm->r_end, 0, __LINE__, 5, rsm->r_flags, rsm);
counter_u64_add(rack_collapsed_win_rxt, 1);
counter_u64_add(rack_collapsed_win_rxt_bytes, (rsm->r_end - rsm->r_start));
}
if (doing_tlp)
log.u_bbr.flex8 = 2;
else
log.u_bbr.flex8 = 1;
} else {
if (doing_tlp)
log.u_bbr.flex8 = 3;
}
log.u_bbr.pacing_gain = rack_get_output_gain(rack, rsm);
log.u_bbr.flex7 = mark;
log.u_bbr.flex7 <<= 8;
log.u_bbr.flex7 |= pass;
log.u_bbr.pkts_out = tp->t_maxseg;
log.u_bbr.timeStamp = cts;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
if (rsm && (rsm->r_rtr_cnt > 0)) {
log.u_bbr.flex5 = rsm->r_fas;
log.u_bbr.bbr_substate = rsm->r_bas;
} else {
log.u_bbr.flex5 = log.u_bbr.inflight;
log.u_bbr.bbr_substate = (uint8_t)((len + segsiz - 1)/segsiz);
}
log.u_bbr.lt_epoch = cwnd_to_use;
log.u_bbr.delivered = sendalot;
log.u_bbr.rttProp = (uintptr_t)rsm;
log.u_bbr.pkt_epoch = __LINE__;
if (rsm) {
log.u_bbr.delRate = rsm->r_flags;
log.u_bbr.delRate <<= 31;
log.u_bbr.delRate |= rack->r_must_retran;
log.u_bbr.delRate <<= 1;
log.u_bbr.delRate |= (sack_rxmit & 0x00000001);
} else {
log.u_bbr.delRate = rack->r_must_retran;
log.u_bbr.delRate <<= 1;
log.u_bbr.delRate |= (sack_rxmit & 0x00000001);
}
lgb = tcp_log_event(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_OUT, ERRNO_UNK,
len, &log, false, NULL, __func__, __LINE__, &tv);
} else
lgb = NULL;
#ifdef INET6
if (isipv6) {
rack->r_ctl.fsb.hoplimit = ip6->ip6_hlim = in6_selecthlim(inp, NULL);
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss)
tp->t_flags2 |= TF2_PLPMTU_PMTUD;
else
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
if (tp->t_state == TCPS_SYN_SENT)
TCP_PROBE5(connect__request, NULL, tp, ip6, tp, th);
TCP_PROBE5(send, NULL, tp, ip6, tp, th);
error = ip6_output(m,
inp->in6p_outputopts,
&inp->inp_route6,
((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0),
NULL, NULL, inp);
if (error == EMSGSIZE && inp->inp_route6.ro_nh != NULL)
mtu = inp->inp_route6.ro_nh->nh_mtu;
}
#endif
#if defined(INET) && defined(INET6)
else
#endif
#ifdef INET
{
ip->ip_len = htons(m->m_pkthdr.len);
#ifdef INET6
if (inp->inp_vflag & INP_IPV6PROTO)
ip->ip_ttl = in6_selecthlim(inp, NULL);
#endif
rack->r_ctl.fsb.hoplimit = ip->ip_ttl;
if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss) {
tp->t_flags2 |= TF2_PLPMTU_PMTUD;
if (tp->t_port == 0 || len < V_tcp_minmss) {
ip->ip_off |= htons(IP_DF);
}
} else {
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
}
if (tp->t_state == TCPS_SYN_SENT)
TCP_PROBE5(connect__request, NULL, tp, ip, tp, th);
TCP_PROBE5(send, NULL, tp, ip, tp, th);
error = ip_output(m,
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
inp->inp_options,
#else
NULL,
#endif
&inp->inp_route,
((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0), 0,
inp);
if (error == EMSGSIZE && inp->inp_route.ro_nh != NULL)
mtu = inp->inp_route.ro_nh->nh_mtu;
}
#endif
if (lgb) {
lgb->tlb_errno = error;
lgb = NULL;
}
out:
if ((rsm == NULL) && doing_tlp)
add_flag |= RACK_TLP;
rack_log_output(tp, &to, len, rack_seq, (uint8_t) flags, error,
rack_to_usec_ts(&tv),
rsm, add_flag, s_mb, s_moff, hw_tls, segsiz);
if (error == 0) {
if (add_flag & RACK_IS_PCM) {
rack->pcm_in_progress = 1;
rack->pcm_needed = 0;
rack_log_pcm(rack, 7, len, rack->r_ctl.pcm_max_seg, add_flag);
}
if (rsm == NULL) {
if (rack->lt_bw_up == 0) {
rack->r_ctl.lt_timemark = tcp_tv_to_lusec(&tv);
rack->r_ctl.lt_seq = tp->snd_una;
rack->lt_bw_up = 1;
} else if (((rack_seq + len) - rack->r_ctl.lt_seq) > 0x7fffffff) {
uint64_t tmark;
rack->r_ctl.lt_bw_bytes += (tp->snd_una - rack->r_ctl.lt_seq);
rack->r_ctl.lt_seq = tp->snd_una;
tmark = tcp_get_u64_usecs(&tv);
if (tmark > rack->r_ctl.lt_timemark) {
rack->r_ctl.lt_bw_time += (tmark - rack->r_ctl.lt_timemark);
rack->r_ctl.lt_timemark = tmark;
}
}
}
rack->forced_ack = 0;
counter_u64_add(rack_total_bytes, len);
tcp_account_for_send(tp, len, (rsm != NULL), doing_tlp, hw_tls);
if (rsm && doing_tlp) {
rack->rc_last_sent_tlp_past_cumack = 0;
rack->rc_last_sent_tlp_seq_valid = 1;
rack->r_ctl.last_sent_tlp_seq = rsm->r_start;
rack->r_ctl.last_sent_tlp_len = rsm->r_end - rsm->r_start;
}
if (rack->rc_hw_nobuf) {
rack->rc_hw_nobuf = 0;
rack->r_ctl.rc_agg_delayed = 0;
rack->r_early = 0;
rack->r_late = 0;
rack->r_ctl.rc_agg_early = 0;
}
if (rsm && (doing_tlp == 0)) {
rack->rc_gp_saw_rec = 1;
} else {
if (cwnd_to_use > tp->snd_ssthresh) {
rack->rc_gp_saw_ca = 1;
} else {
rack->rc_gp_saw_ss = 1;
}
}
if (TCPS_HAVEESTABLISHED(tp->t_state) &&
(tp->t_flags & TF_SACK_PERMIT) &&
tp->rcv_numsacks > 0)
tcp_clean_dsack_blocks(tp);
tot_len_this_send += len;
if (len == 0) {
counter_u64_add(rack_out_size[TCP_MSS_ACCT_SNDACK], 1);
} else {
int idx;
idx = (len / segsiz) + 3;
if (idx >= TCP_MSS_ACCT_ATIMER)
counter_u64_add(rack_out_size[(TCP_MSS_ACCT_ATIMER-1)], 1);
else
counter_u64_add(rack_out_size[idx], 1);
}
}
if ((rack->rack_no_prr == 0) &&
sub_from_prr &&
(error == 0)) {
if (rack->r_ctl.rc_prr_sndcnt >= len)
rack->r_ctl.rc_prr_sndcnt -= len;
else
rack->r_ctl.rc_prr_sndcnt = 0;
}
sub_from_prr = 0;
if (rsm != NULL) {
if (doing_tlp)
rsm->r_flags |= RACK_TLP;
else
rsm->r_flags &= ~RACK_TLP;
}
if ((error == 0) &&
(len > 0) &&
(tp->snd_una == tp->snd_max))
rack->r_ctl.rc_tlp_rxt_last_time = cts;
{
tcp_seq startseq = tp->snd_max;
if (rsm && (doing_tlp == 0))
rack->r_ctl.rc_loss_count += rsm->r_end - rsm->r_start;
if (error)
goto nomore;
if (doing_tlp == 0) {
if (rsm == NULL) {
rack->rc_tlp_in_progress = 0;
rack->r_ctl.rc_tlp_cnt_out = 0;
}
} else {
rack->rc_tlp_in_progress = 1;
rack->r_ctl.rc_tlp_cnt_out++;
}
if (sack_rxmit)
goto nomore;
if ((tp->snd_una == tp->snd_max) && (len > 0)) {
rack_log_progress_event(rack, tp, ticks, PROGRESS_START, __LINE__);
tp->t_acktime = ticks;
}
if (flags & (TH_SYN | TH_FIN)) {
if ((flags & TH_SYN) != 0 && tp->snd_max == tp->iss) {
tp->snd_max++;
}
if ((flags & TH_FIN) &&
((tp->t_flags & TF_SENTFIN) == 0)) {
tp->snd_max++;
tp->t_flags |= TF_SENTFIN;
}
}
tp->snd_max += len;
if (rack->rc_new_rnd_needed) {
rack_new_round_starts(tp, rack, tp->snd_max);
}
if (tp->t_rtttime == 0) {
tp->t_rtttime = ticks;
tp->t_rtseq = startseq;
KMOD_TCPSTAT_INC(tcps_segstimed);
}
if (len &&
((tp->t_flags & TF_GPUTINPROG) == 0))
rack_start_gp_measurement(tp, rack, startseq, sb_offset);
if (rack->r_fast_output && len) {
if (rack->r_ctl.fsb.left_to_send > len)
rack->r_ctl.fsb.left_to_send -= len;
else
rack->r_ctl.fsb.left_to_send = 0;
if (rack->r_ctl.fsb.left_to_send < segsiz)
rack->r_fast_output = 0;
if (rack->r_fast_output) {
rack->r_ctl.fsb.m = sbsndmbuf(sb, (tp->snd_max - tp->snd_una), &rack->r_ctl.fsb.off);
rack->r_ctl.fsb.o_m_len = rack->r_ctl.fsb.m->m_len;
rack->r_ctl.fsb.o_t_len = M_TRAILINGROOM(rack->r_ctl.fsb.m);
}
}
if (rack_pcm_blast == 0) {
if ((orig_len > len) &&
(add_flag & RACK_IS_PCM) &&
(len < pace_max_seg) &&
((pace_max_seg - len) > segsiz)) {
uint32_t n_len;
n_len = (orig_len - len);
orig_len -= len;
pace_max_seg -= len;
len = n_len;
sb_offset = tp->snd_max - tp->snd_una;
SOCK_SENDBUF_LOCK(so);
goto send;
}
} else {
if ((orig_len > len) &&
(add_flag & RACK_IS_PCM) &&
((orig_len - len) > segsiz)) {
uint32_t n_len;
n_len = (orig_len - len);
orig_len -= len;
len = n_len;
sb_offset = tp->snd_max - tp->snd_una;
SOCK_SENDBUF_LOCK(so);
goto send;
}
}
}
nomore:
if (error) {
rack->r_ctl.rc_agg_delayed = 0;
rack->r_early = 0;
rack->r_late = 0;
rack->r_ctl.rc_agg_early = 0;
SOCKBUF_UNLOCK_ASSERT(sb);
sendalot = 0;
switch (error) {
case EPERM:
case EACCES:
tp->t_softerror = error;
#ifdef TCP_ACCOUNTING
crtsc = get_cyclecount();
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[SND_OUT_FAIL]++;
tp->tcp_proc_time[SND_OUT_FAIL] += (crtsc - ts_val);
}
sched_unpin();
#endif
return (error);
case ENOBUFS:
if (rack->r_ctl.crte != NULL) {
tcp_trace_point(rack->rc_tp, TCP_TP_HWENOBUF);
if (tcp_bblogging_on(rack->rc_tp))
rack_log_queue_level(tp, rack, len, &tv, cts);
} else
tcp_trace_point(rack->rc_tp, TCP_TP_ENOBUF);
pacing_delay = ((1 + rack->rc_enobuf) * HPTS_USEC_IN_MSEC);
if (rack->rc_enobuf < 0x7f)
rack->rc_enobuf++;
if (pacing_delay < (10 * HPTS_USEC_IN_MSEC))
pacing_delay = 10 * HPTS_USEC_IN_MSEC;
if (rack->r_ctl.crte != NULL) {
counter_u64_add(rack_saw_enobuf_hw, 1);
tcp_rl_log_enobuf(rack->r_ctl.crte);
}
counter_u64_add(rack_saw_enobuf, 1);
goto enobufs;
case EMSGSIZE:
if (tso)
tp->t_flags &= ~TF_TSO;
if (mtu != 0) {
int saved_mtu;
saved_mtu = tp->t_maxseg;
tcp_mss_update(tp, -1, mtu, NULL, NULL);
if (saved_mtu > tp->t_maxseg) {
goto again;
}
}
pacing_delay = 10 * HPTS_USEC_IN_MSEC;
rack_start_hpts_timer(rack, tp, cts, pacing_delay, 0, 0);
#ifdef TCP_ACCOUNTING
crtsc = get_cyclecount();
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[SND_OUT_FAIL]++;
tp->tcp_proc_time[SND_OUT_FAIL] += (crtsc - ts_val);
}
sched_unpin();
#endif
return (error);
case ENETUNREACH:
counter_u64_add(rack_saw_enetunreach, 1);
case EHOSTDOWN:
case EHOSTUNREACH:
case ENETDOWN:
if (TCPS_HAVERCVDSYN(tp->t_state)) {
tp->t_softerror = error;
error = 0;
}
default:
pacing_delay = 10 * HPTS_USEC_IN_MSEC;
rack_start_hpts_timer(rack, tp, cts, pacing_delay, 0, 0);
#ifdef TCP_ACCOUNTING
crtsc = get_cyclecount();
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[SND_OUT_FAIL]++;
tp->tcp_proc_time[SND_OUT_FAIL] += (crtsc - ts_val);
}
sched_unpin();
#endif
return (error);
}
} else {
rack->rc_enobuf = 0;
if (IN_FASTRECOVERY(tp->t_flags) && rsm)
rack->r_ctl.retran_during_recovery += len;
}
KMOD_TCPSTAT_INC(tcps_sndtotal);
if (recwin > 0 && SEQ_GT(tp->rcv_nxt + recwin, tp->rcv_adv))
tp->rcv_adv = tp->rcv_nxt + recwin;
tp->last_ack_sent = tp->rcv_nxt;
tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
enobufs:
if (sendalot) {
if (pace_max_seg &&
(tot_len_this_send >= pace_max_seg)) {
sendalot = 0;
}
}
if ((error == 0) && (flags & TH_FIN))
tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_FIN);
if (flags & TH_RST) {
pacing_delay = 0;
sendalot = 0;
if (error == 0)
tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
} else if ((pacing_delay == 0) && (sendalot == 0) && tot_len_this_send) {
pacing_delay = rack_get_pacing_delay(rack, tp, tot_len_this_send, rsm, segsiz, __LINE__);
}
rack->r_ent_rec_ns = 0;
if (rack->r_must_retran) {
if (rsm) {
rack->r_ctl.rc_out_at_rto -= (rsm->r_end - rsm->r_start);
if (SEQ_GEQ(rsm->r_end, rack->r_ctl.rc_snd_max_at_rto)) {
rack->r_must_retran = 0;
rack->r_ctl.rc_out_at_rto = 0;
}
} else if (SEQ_GEQ(tp->snd_max, rack->r_ctl.rc_snd_max_at_rto)) {
rack->r_must_retran = 0;
rack->r_ctl.rc_out_at_rto = 0;
}
}
rack->r_ctl.fsb.recwin = recwin;
if ((tp->t_flags & (TF_WASCRECOVERY|TF_WASFRECOVERY)) &&
SEQ_GT(tp->snd_max, rack->r_ctl.rc_snd_max_at_rto)) {
tp->t_flags &= ~(TF_WASCRECOVERY|TF_WASFRECOVERY);
}
if (pacing_delay) {
if ((error == 0) &&
rack_use_rfo &&
((flags & (TH_SYN|TH_FIN)) == 0) &&
(rsm == NULL) &&
(ipoptlen == 0) &&
(doing_tlp == 0) &&
rack->r_fsb_inited &&
TCPS_HAVEESTABLISHED(tp->t_state) &&
((IN_RECOVERY(tp->t_flags)) == 0) &&
(rack->r_must_retran == 0) &&
((tp->t_flags & TF_NEEDFIN) == 0) &&
(len > 0) && (orig_len > 0) &&
(orig_len > len) &&
((orig_len - len) >= segsiz) &&
((optlen == 0) ||
((optlen == TCPOLEN_TSTAMP_APPA) && (to.to_flags & TOF_TS)))) {
rack_setup_fast_output(tp, rack, sb, len, orig_len,
segsiz, pace_max_seg, hw_tls, flags);
} else
rack->r_fast_output = 0;
rack_log_fsb(rack, tp, so, flags,
ipoptlen, orig_len, len, error,
(rsm == NULL), optlen, __LINE__, 2);
} else if (sendalot) {
int ret;
sack_rxmit = 0;
if ((error == 0) &&
rack_use_rfo &&
((flags & (TH_SYN|TH_FIN)) == 0) &&
(rsm == NULL) &&
(doing_tlp == 0) &&
(ipoptlen == 0) &&
(rack->r_must_retran == 0) &&
rack->r_fsb_inited &&
TCPS_HAVEESTABLISHED(tp->t_state) &&
((IN_RECOVERY(tp->t_flags)) == 0) &&
((tp->t_flags & TF_NEEDFIN) == 0) &&
(len > 0) && (orig_len > 0) &&
(orig_len > len) &&
((orig_len - len) >= segsiz) &&
((optlen == 0) ||
((optlen == TCPOLEN_TSTAMP_APPA) && (to.to_flags & TOF_TS)))) {
rack_setup_fast_output(tp, rack, sb, len, orig_len,
segsiz, pace_max_seg, hw_tls, flags);
if (rack->r_fast_output) {
error = 0;
ret = rack_fast_output(tp, rack, ts_val, cts, ms_cts, &tv, &tot_len_this_send, &error, __LINE__);
if (ret >= 0)
return (ret);
else if (error)
goto nomore;
}
}
goto again;
}
skip_all_send:
if (SEQ_GT(tp->snd_max, tp->snd_nxt))
tp->snd_nxt = tp->snd_max;
rack_start_hpts_timer(rack, tp, cts, pacing_delay, tot_len_this_send, 0);
#ifdef TCP_ACCOUNTING
crtsc = get_cyclecount() - ts_val;
if (tot_len_this_send) {
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[SND_OUT_DATA]++;
tp->tcp_proc_time[SND_OUT_DATA] += crtsc;
tp->tcp_cnt_counters[CNT_OF_MSS_OUT] += ((tot_len_this_send + segsiz - 1) /segsiz);
}
} else {
if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
tp->tcp_cnt_counters[SND_OUT_ACK]++;
tp->tcp_proc_time[SND_OUT_ACK] += crtsc;
}
}
sched_unpin();
#endif
if (error == ENOBUFS)
error = 0;
return (error);
}
static void
rack_update_seg(struct tcp_rack *rack)
{
uint32_t orig_val;
orig_val = rack->r_ctl.rc_pace_max_segs;
rack_set_pace_segments(rack->rc_tp, rack, __LINE__, NULL);
if (orig_val != rack->r_ctl.rc_pace_max_segs)
rack_log_pacing_delay_calc(rack, 0, 0, orig_val, 0, 0, 15, __LINE__, NULL, 0);
}
static void
rack_mtu_change(struct tcpcb *tp)
{
struct tcp_rack *rack;
struct rack_sendmap *rsm;
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (rack->r_ctl.rc_pace_min_segs != ctf_fixed_maxseg(tp)) {
rack_set_pace_segments(tp, rack, __LINE__, NULL);
rack_remxt_tmr(tp);
rack->r_fast_output = 0;
rack->r_ctl.rc_out_at_rto = ctf_flight_size(tp,
rack->r_ctl.rc_sacked);
rack->r_ctl.rc_snd_max_at_rto = tp->snd_max;
rack->r_must_retran = 1;
TAILQ_FOREACH(rsm, &rack->r_ctl.rc_tmap, r_tnext) {
rsm->r_flags |= (RACK_MUST_RXT|RACK_PMTU_CHG);
}
}
sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
tp->snd_nxt = tp->snd_max;
}
static int
rack_set_dgp(struct tcp_rack *rack)
{
if (rack->dgp_on == 1)
return(0);
if ((rack->use_fixed_rate == 1) &&
(rack->rc_always_pace == 1)) {
return (EBUSY);
}
if (rack->rc_always_pace == 1) {
rack_remove_pacing(rack);
}
if (tcp_incr_dgp_pacing_cnt() == 0)
return (ENOSPC);
rack->r_ctl.pacing_method |= RACK_DGP_PACING;
rack->rc_fillcw_apply_discount = 0;
rack->dgp_on = 1;
rack->rc_always_pace = 1;
rack->rc_pace_dnd = 1;
rack->use_fixed_rate = 0;
if (rack->gp_ready)
rack_set_cc_pacing(rack);
rack->rc_tp->t_flags2 |= TF2_SUPPORTS_MBUFQ;
rack->rack_attempt_hdwr_pace = 0;
rack->full_size_rxt = 1;
rack->shape_rxt_to_pacing_min = 0;
rack->r_use_cmp_ack = 1;
if (TCPS_HAVEESTABLISHED(rack->rc_tp->t_state) &&
rack->r_use_cmp_ack)
rack->rc_tp->t_flags2 |= TF2_MBUF_ACKCMP;
rack->rack_enable_scwnd = 1;
rack->rc_gp_dyn_mul = 1;
rack->r_ctl.rack_per_of_gp_ca = 100;
rack->r_rr_config = 3;
rack->r_ctl.rc_no_push_at_mrtt = 2;
rack->rc_pace_to_cwnd = 1;
rack->rc_pace_fill_if_rttin_range = 0;
rack->rtt_limit_mul = 0;
rack->rack_no_prr = 1;
rack->r_limit_scw = 1;
rack->r_ctl.rack_per_of_gp_rec = 90;
return (0);
}
static int
rack_set_profile(struct tcp_rack *rack, int prof)
{
int err = EINVAL;
if (prof == 1) {
err = rack_set_dgp(rack);
if (err)
return (err);
} else if (prof == 6) {
err = rack_set_dgp(rack);
if (err)
return (err);
rack->rc_fillcw_apply_discount = 1;
} else if (prof == 0) {
if (rack->rc_always_pace == 1) {
rack_remove_pacing(rack);
} else {
rack->dgp_on = 0;
rack->rc_hybrid_mode = 0;
rack->use_fixed_rate = 0;
}
err = 0;
if (rack_fill_cw_state)
rack->rc_pace_to_cwnd = 1;
else
rack->rc_pace_to_cwnd = 0;
if (rack_pace_every_seg && tcp_can_enable_pacing()) {
rack->r_ctl.pacing_method |= RACK_REG_PACING;
rack->rc_always_pace = 1;
if (rack->rack_hibeta)
rack_set_cc_pacing(rack);
} else
rack->rc_always_pace = 0;
if (rack_dsack_std_based & 0x1) {
rack->rc_rack_tmr_std_based = 1;
}
if (rack_dsack_std_based & 0x2) {
rack->rc_rack_use_dsack = 1;
}
if (rack_use_cmp_acks)
rack->r_use_cmp_ack = 1;
else
rack->r_use_cmp_ack = 0;
if (rack_disable_prr)
rack->rack_no_prr = 1;
else
rack->rack_no_prr = 0;
if (rack_gp_no_rec_chg)
rack->rc_gp_no_rec_chg = 1;
else
rack->rc_gp_no_rec_chg = 0;
if (rack_enable_mqueue_for_nonpaced || rack->r_use_cmp_ack) {
rack->r_mbuf_queue = 1;
if (TCPS_HAVEESTABLISHED(rack->rc_tp->t_state))
rack->rc_tp->t_flags2 |= TF2_MBUF_ACKCMP;
rack->rc_tp->t_flags2 |= TF2_SUPPORTS_MBUFQ;
} else {
rack->r_mbuf_queue = 0;
rack->rc_tp->t_flags2 &= ~TF2_SUPPORTS_MBUFQ;
}
if (rack_enable_shared_cwnd)
rack->rack_enable_scwnd = 1;
else
rack->rack_enable_scwnd = 0;
if (rack_do_dyn_mul) {
rack->rc_gp_dyn_mul = 1;
if (rack_do_dyn_mul >= 100)
rack->r_ctl.rack_per_of_gp_ca = rack_do_dyn_mul;
} else {
rack->r_ctl.rack_per_of_gp_ca = rack_per_of_gp_ca;
rack->rc_gp_dyn_mul = 0;
}
rack->r_rr_config = 0;
rack->r_ctl.rc_no_push_at_mrtt = 0;
rack->rc_pace_fill_if_rttin_range = 0;
rack->rtt_limit_mul = 0;
if (rack_enable_hw_pacing)
rack->rack_hdw_pace_ena = 1;
else
rack->rack_hdw_pace_ena = 0;
if (rack_disable_prr)
rack->rack_no_prr = 1;
else
rack->rack_no_prr = 0;
if (rack_limits_scwnd)
rack->r_limit_scw = 1;
else
rack->r_limit_scw = 0;
rack_init_retransmit_value(rack, rack_rxt_controls);
err = 0;
}
return (err);
}
static int
rack_add_deferred_option(struct tcp_rack *rack, int sopt_name, uint64_t loptval)
{
struct deferred_opt_list *dol;
dol = malloc(sizeof(struct deferred_opt_list),
M_TCPDO, M_NOWAIT|M_ZERO);
if (dol == NULL) {
return (0);
}
dol->optname = sopt_name;
dol->optval = loptval;
TAILQ_INSERT_TAIL(&rack->r_ctl.opt_list, dol, next);
return (1);
}
static int
process_hybrid_pacing(struct tcp_rack *rack, struct tcp_hybrid_req *hybrid)
{
#ifdef TCP_REQUEST_TRK
struct tcp_sendfile_track *sft;
struct timeval tv;
tcp_seq seq;
int err;
microuptime(&tv);
rack->use_fixed_rate = 0;
rack->r_ctl.rc_fixed_pacing_rate_rec = 0;
rack->r_ctl.rc_fixed_pacing_rate_ca = 0;
rack->r_ctl.rc_fixed_pacing_rate_ss = 0;
sft = tcp_req_alloc_req_full(rack->rc_tp, &hybrid->req, tcp_tv_to_lusec(&tv), 0);
if (sft == NULL) {
rack->rc_tp->tcp_hybrid_error++;
seq = rack->rc_tp->snd_una + rack->rc_tp->t_inpcb.inp_socket->so_snd.sb_ccc;
rack_log_hybrid(rack, seq, NULL, HYBRID_LOG_NO_ROOM, __LINE__, 0);
return (ENOSPC);
}
hybrid->hybrid_flags &= TCP_HYBRID_PACING_USER_MASK;
seq = sft->start_seq;
if ((hybrid->hybrid_flags & TCP_HYBRID_PACING_ENABLE) == 0) {
if (rack->rc_hybrid_mode) {
rack_set_profile(rack, 0);
rack->rc_tp->tcp_hybrid_stop++;
}
rack_log_hybrid(rack, seq, sft, HYBRID_LOG_TURNED_OFF, __LINE__, 0);
return (0);
}
if (rack->dgp_on == 0) {
if ((err = rack_set_profile(rack, 1)) != 0){
rack->rc_tp->tcp_hybrid_error++;
rack_log_hybrid(rack, seq, sft, HYBRID_LOG_NO_PACING, __LINE__, 0);
return (err);
}
}
if (rack->rc_hybrid_mode == 0) {
if (tcp_can_enable_pacing()) {
rack->r_ctl.pacing_method |= RACK_REG_PACING;
rack->rc_hybrid_mode = 1;
} else {
return (ENOSPC);
}
if (rack->r_ctl.pacing_method & RACK_DGP_PACING) {
tcp_dec_dgp_pacing_cnt();
rack->r_ctl.pacing_method &= ~RACK_DGP_PACING;
}
}
sft->hybrid_flags = hybrid->hybrid_flags | TCP_HYBRID_PACING_WASSET;
if (hybrid->hybrid_flags & TCP_HYBRID_PACING_CSPR)
sft->cspr = hybrid->cspr;
else
sft->cspr = 0;
if (hybrid->hybrid_flags & TCP_HYBRID_PACING_H_MS)
sft->hint_maxseg = hybrid->hint_maxseg;
else
sft->hint_maxseg = 0;
rack->rc_tp->tcp_hybrid_start++;
rack_log_hybrid(rack, seq, sft, HYBRID_LOG_RULES_SET, __LINE__,0);
return (0);
#else
return (ENOTSUP);
#endif
}
static int
rack_stack_information(struct tcpcb *tp, struct stack_specific_info *si)
{
si->bytes_transmitted = tp->t_sndbytes;
si->bytes_retransmitted = tp->t_snd_rxt_bytes;
return (0);
}
static int
rack_process_option(struct tcpcb *tp, struct tcp_rack *rack, int sopt_name,
uint32_t optval, uint64_t loptval, struct tcp_hybrid_req *hybrid)
{
struct epoch_tracker et;
struct sockopt sopt;
struct cc_newreno_opts opt;
uint64_t val;
int error = 0;
uint16_t ca, ss;
switch (sopt_name) {
case TCP_RACK_SET_RXT_OPTIONS:
if (optval <= 2) {
rack_init_retransmit_value(rack, optval);
} else {
error = EINVAL;
}
break;
case TCP_RACK_DSACK_OPT:
RACK_OPTS_INC(tcp_rack_dsack_opt);
if (optval & 0x1) {
rack->rc_rack_tmr_std_based = 1;
} else {
rack->rc_rack_tmr_std_based = 0;
}
if (optval & 0x2) {
rack->rc_rack_use_dsack = 1;
} else {
rack->rc_rack_use_dsack = 0;
}
rack_log_dsack_event(rack, 5, __LINE__, 0, 0);
break;
case TCP_RACK_PACING_DIVISOR:
RACK_OPTS_INC(tcp_rack_pacing_divisor);
if (optval == 0) {
rack->r_ctl.pace_len_divisor = rack_default_pacing_divisor;
} else {
if (optval < RL_MIN_DIVISOR)
rack->r_ctl.pace_len_divisor = RL_MIN_DIVISOR;
else
rack->r_ctl.pace_len_divisor = optval;
}
break;
case TCP_RACK_HI_BETA:
RACK_OPTS_INC(tcp_rack_hi_beta);
if (optval > 0) {
rack->rack_hibeta = 1;
if ((optval >= 50) &&
(optval <= 100)) {
rack->r_ctl.saved_hibeta = optval;
if (rack->rc_pacing_cc_set)
rack_undo_cc_pacing(rack);
rack->r_ctl.rc_saved_beta = optval;
}
if (rack->rc_pacing_cc_set == 0)
rack_set_cc_pacing(rack);
} else {
rack->rack_hibeta = 0;
if (rack->rc_pacing_cc_set)
rack_undo_cc_pacing(rack);
}
break;
case TCP_RACK_PACING_BETA:
error = EINVAL;
break;
case TCP_RACK_TIMER_SLOP:
RACK_OPTS_INC(tcp_rack_timer_slop);
rack->r_ctl.timer_slop = optval;
if (rack->rc_tp->t_srtt) {
RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
rack_rto_min, rack_rto_max,
rack->r_ctl.timer_slop);
}
break;
case TCP_RACK_PACING_BETA_ECN:
RACK_OPTS_INC(tcp_rack_beta_ecn);
if (strcmp(tp->t_cc->name, CCALGONAME_NEWRENO) != 0) {
error = EINVAL;
break;
}
if (rack->rc_pacing_cc_set) {
sopt.sopt_dir = SOPT_SET;
opt.name = CC_NEWRENO_BETA_ECN;
opt.val = optval;
if (CC_ALGO(tp)->ctl_output != NULL)
error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, &sopt, &opt);
else
error = ENOENT;
} else {
rack->r_ctl.rc_saved_beta_ecn = optval;
}
break;
case TCP_DEFER_OPTIONS:
RACK_OPTS_INC(tcp_defer_opt);
if (optval) {
if (rack->gp_ready) {
error = EINVAL;
break;
}
rack->defer_options = 1;
} else
rack->defer_options = 0;
break;
case TCP_RACK_MEASURE_CNT:
RACK_OPTS_INC(tcp_rack_measure_cnt);
if (optval && (optval <= 0xff)) {
rack->r_ctl.req_measurements = optval;
} else
error = EINVAL;
break;
case TCP_REC_ABC_VAL:
RACK_OPTS_INC(tcp_rec_abc_val);
if (optval > 0)
rack->r_use_labc_for_rec = 1;
else
rack->r_use_labc_for_rec = 0;
break;
case TCP_RACK_ABC_VAL:
RACK_OPTS_INC(tcp_rack_abc_val);
if ((optval > 0) && (optval < 255))
rack->rc_labc = optval;
else
error = EINVAL;
break;
case TCP_HDWR_UP_ONLY:
RACK_OPTS_INC(tcp_pacing_up_only);
if (optval)
rack->r_up_only = 1;
else
rack->r_up_only = 0;
break;
case TCP_FILLCW_RATE_CAP:
RACK_OPTS_INC(tcp_fillcw_rate_cap);
rack->r_ctl.fillcw_cap = loptval;
break;
case TCP_PACING_RATE_CAP:
RACK_OPTS_INC(tcp_pacing_rate_cap);
if ((rack->dgp_on == 1) &&
(rack->r_ctl.pacing_method & RACK_DGP_PACING)) {
if (tcp_can_enable_pacing() == 0) {
error = ENOSPC;
break;
}
rack->r_ctl.pacing_method |= RACK_REG_PACING;
tcp_dec_dgp_pacing_cnt();
rack->r_ctl.pacing_method &= ~RACK_DGP_PACING;
}
rack->r_ctl.bw_rate_cap = loptval;
break;
case TCP_HYBRID_PACING:
if (hybrid == NULL) {
error = EINVAL;
break;
}
if (rack->r_ctl.side_chan_dis_mask & HYBRID_DIS_MASK) {
error = EPERM;
break;
}
error = process_hybrid_pacing(rack, hybrid);
break;
case TCP_SIDECHAN_DIS:
if (optval)
rack->r_ctl.side_chan_dis_mask = optval;
else
rack->r_ctl.side_chan_dis_mask = 0;
break;
case TCP_RACK_PROFILE:
RACK_OPTS_INC(tcp_profile);
error = rack_set_profile(rack, optval);
break;
case TCP_USE_CMP_ACKS:
RACK_OPTS_INC(tcp_use_cmp_acks);
if ((optval == 0) && (tp->t_flags2 & TF2_MBUF_ACKCMP)) {
error = EINVAL;
} else if ((optval == 1) && (rack->r_use_cmp_ack == 0)) {
rack->r_use_cmp_ack = 1;
rack->r_mbuf_queue = 1;
tp->t_flags2 |= TF2_SUPPORTS_MBUFQ;
}
if (rack->r_use_cmp_ack && TCPS_HAVEESTABLISHED(tp->t_state))
tp->t_flags2 |= TF2_MBUF_ACKCMP;
break;
case TCP_SHARED_CWND_TIME_LIMIT:
RACK_OPTS_INC(tcp_lscwnd);
if (optval)
rack->r_limit_scw = 1;
else
rack->r_limit_scw = 0;
break;
case TCP_RACK_DGP_IN_REC:
error = EINVAL;
break;
case TCP_RACK_PACE_TO_FILL:
RACK_OPTS_INC(tcp_fillcw);
if (optval == 0)
rack->rc_pace_to_cwnd = 0;
else {
rack->rc_pace_to_cwnd = 1;
}
if ((optval >= rack_gp_rtt_maxmul) &&
rack_gp_rtt_maxmul &&
(optval < 0xf)) {
rack->rc_pace_fill_if_rttin_range = 1;
rack->rtt_limit_mul = optval;
} else {
rack->rc_pace_fill_if_rttin_range = 0;
rack->rtt_limit_mul = 0;
}
break;
case TCP_RACK_NO_PUSH_AT_MAX:
RACK_OPTS_INC(tcp_npush);
if (optval == 0)
rack->r_ctl.rc_no_push_at_mrtt = 0;
else if (optval < 0xff)
rack->r_ctl.rc_no_push_at_mrtt = optval;
else
error = EINVAL;
break;
case TCP_SHARED_CWND_ENABLE:
RACK_OPTS_INC(tcp_rack_scwnd);
if (optval == 0)
rack->rack_enable_scwnd = 0;
else
rack->rack_enable_scwnd = 1;
break;
case TCP_RACK_MBUF_QUEUE:
RACK_OPTS_INC(tcp_rack_mbufq);
if (optval || rack->r_use_cmp_ack)
rack->r_mbuf_queue = 1;
else
rack->r_mbuf_queue = 0;
if (rack->r_mbuf_queue || rack->rc_always_pace || rack->r_use_cmp_ack)
tp->t_flags2 |= TF2_SUPPORTS_MBUFQ;
else
tp->t_flags2 &= ~TF2_SUPPORTS_MBUFQ;
break;
case TCP_RACK_NONRXT_CFG_RATE:
RACK_OPTS_INC(tcp_rack_cfg_rate);
if (optval == 0)
rack->rack_rec_nonrxt_use_cr = 0;
else
rack->rack_rec_nonrxt_use_cr = 1;
break;
case TCP_NO_PRR:
RACK_OPTS_INC(tcp_rack_noprr);
if (optval == 0)
rack->rack_no_prr = 0;
else if (optval == 1)
rack->rack_no_prr = 1;
else if (optval == 2)
rack->no_prr_addback = 1;
else
error = EINVAL;
break;
case RACK_CSPR_IS_FCC:
if (optval > 0)
rack->cspr_is_fcc = 1;
else
rack->cspr_is_fcc = 0;
break;
case TCP_TIMELY_DYN_ADJ:
RACK_OPTS_INC(tcp_timely_dyn);
if (optval == 0)
rack->rc_gp_dyn_mul = 0;
else {
rack->rc_gp_dyn_mul = 1;
if (optval >= 100) {
rack->r_ctl.rack_per_of_gp_ca = optval;
}
}
break;
case TCP_RACK_DO_DETECTION:
error = EINVAL;
break;
case TCP_RACK_TLP_USE:
if ((optval < TLP_USE_ID) || (optval > TLP_USE_TWO_TWO)) {
error = EINVAL;
break;
}
RACK_OPTS_INC(tcp_tlp_use);
rack->rack_tlp_threshold_use = optval;
break;
case TCP_RACK_TLP_REDUCE:
RACK_OPTS_INC(tcp_rack_tlp_reduce);
rack->r_ctl.rc_tlp_cwnd_reduce = optval;
break;
case TCP_RACK_PACE_ALWAYS:
RACK_OPTS_INC(tcp_rack_pace_always);
if (rack->r_ctl.side_chan_dis_mask & CCSP_DIS_MASK) {
error = EPERM;
break;
}
if (optval > 0) {
if (rack->rc_always_pace) {
error = EALREADY;
break;
} else if (tcp_can_enable_pacing()) {
rack->r_ctl.pacing_method |= RACK_REG_PACING;
rack->rc_always_pace = 1;
if (rack->rack_hibeta)
rack_set_cc_pacing(rack);
}
else {
error = ENOSPC;
break;
}
} else {
if (rack->rc_always_pace == 1) {
rack_remove_pacing(rack);
}
}
if (rack->r_mbuf_queue || rack->rc_always_pace || rack->r_use_cmp_ack)
tp->t_flags2 |= TF2_SUPPORTS_MBUFQ;
else
tp->t_flags2 &= ~TF2_SUPPORTS_MBUFQ;
rack_update_seg(rack);
break;
case TCP_BBR_RACK_INIT_RATE:
RACK_OPTS_INC(tcp_initial_rate);
val = optval;
val *= 1000;
val /= 8;
rack->r_ctl.init_rate = val;
if (rack->rc_always_pace)
rack_update_seg(rack);
break;
case TCP_BBR_IWINTSO:
error = EINVAL;
break;
case TCP_RACK_FORCE_MSEG:
RACK_OPTS_INC(tcp_rack_force_max_seg);
if (optval)
rack->rc_force_max_seg = 1;
else
rack->rc_force_max_seg = 0;
break;
case TCP_RACK_PACE_MIN_SEG:
RACK_OPTS_INC(tcp_rack_min_seg);
rack->r_ctl.rc_user_set_min_segs = (0x0000ffff & optval);
rack_set_pace_segments(tp, rack, __LINE__, NULL);
break;
case TCP_RACK_PACE_MAX_SEG:
RACK_OPTS_INC(tcp_rack_max_seg);
if ((rack->dgp_on == 1) &&
(rack->r_ctl.pacing_method & RACK_DGP_PACING)) {
if (tcp_can_enable_pacing() == 0) {
error = ENOSPC;
break;
}
rack->r_ctl.pacing_method |= RACK_REG_PACING;
tcp_dec_dgp_pacing_cnt();
rack->r_ctl.pacing_method &= ~RACK_DGP_PACING;
}
if (optval <= MAX_USER_SET_SEG)
rack->rc_user_set_max_segs = optval;
else
rack->rc_user_set_max_segs = MAX_USER_SET_SEG;
rack_set_pace_segments(tp, rack, __LINE__, NULL);
break;
case TCP_RACK_PACE_RATE_REC:
RACK_OPTS_INC(tcp_rack_pace_rate_rec);
if (rack->r_ctl.side_chan_dis_mask & CCSP_DIS_MASK) {
error = EPERM;
break;
}
if (rack->dgp_on) {
error = EBUSY;
break;
}
rack->r_ctl.rc_fixed_pacing_rate_rec = optval;
if (rack->r_ctl.rc_fixed_pacing_rate_ca == 0)
rack->r_ctl.rc_fixed_pacing_rate_ca = optval;
if (rack->r_ctl.rc_fixed_pacing_rate_ss == 0)
rack->r_ctl.rc_fixed_pacing_rate_ss = optval;
rack->use_fixed_rate = 1;
if (rack->rack_hibeta)
rack_set_cc_pacing(rack);
rack_log_pacing_delay_calc(rack,
rack->r_ctl.rc_fixed_pacing_rate_ss,
rack->r_ctl.rc_fixed_pacing_rate_ca,
rack->r_ctl.rc_fixed_pacing_rate_rec, 0, 0, 8,
__LINE__, NULL,0);
break;
case TCP_RACK_PACE_RATE_SS:
RACK_OPTS_INC(tcp_rack_pace_rate_ss);
if (rack->r_ctl.side_chan_dis_mask & CCSP_DIS_MASK) {
error = EPERM;
break;
}
if (rack->dgp_on) {
error = EBUSY;
break;
}
rack->r_ctl.rc_fixed_pacing_rate_ss = optval;
if (rack->r_ctl.rc_fixed_pacing_rate_ca == 0)
rack->r_ctl.rc_fixed_pacing_rate_ca = optval;
if (rack->r_ctl.rc_fixed_pacing_rate_rec == 0)
rack->r_ctl.rc_fixed_pacing_rate_rec = optval;
rack->use_fixed_rate = 1;
if (rack->rack_hibeta)
rack_set_cc_pacing(rack);
rack_log_pacing_delay_calc(rack,
rack->r_ctl.rc_fixed_pacing_rate_ss,
rack->r_ctl.rc_fixed_pacing_rate_ca,
rack->r_ctl.rc_fixed_pacing_rate_rec, 0, 0, 8,
__LINE__, NULL, 0);
break;
case TCP_RACK_PACE_RATE_CA:
RACK_OPTS_INC(tcp_rack_pace_rate_ca);
if (rack->r_ctl.side_chan_dis_mask & CCSP_DIS_MASK) {
error = EPERM;
break;
}
if (rack->dgp_on) {
error = EBUSY;
break;
}
rack->r_ctl.rc_fixed_pacing_rate_ca = optval;
if (rack->r_ctl.rc_fixed_pacing_rate_ss == 0)
rack->r_ctl.rc_fixed_pacing_rate_ss = optval;
if (rack->r_ctl.rc_fixed_pacing_rate_rec == 0)
rack->r_ctl.rc_fixed_pacing_rate_rec = optval;
rack->use_fixed_rate = 1;
if (rack->rack_hibeta)
rack_set_cc_pacing(rack);
rack_log_pacing_delay_calc(rack,
rack->r_ctl.rc_fixed_pacing_rate_ss,
rack->r_ctl.rc_fixed_pacing_rate_ca,
rack->r_ctl.rc_fixed_pacing_rate_rec, 0, 0, 8,
__LINE__, NULL, 0);
break;
case TCP_RACK_GP_INCREASE_REC:
RACK_OPTS_INC(tcp_gp_inc_rec);
rack->r_ctl.rack_per_of_gp_rec = optval;
rack_log_pacing_delay_calc(rack,
rack->r_ctl.rack_per_of_gp_ss,
rack->r_ctl.rack_per_of_gp_ca,
rack->r_ctl.rack_per_of_gp_rec, 0, 0, 1,
__LINE__, NULL, 0);
break;
case TCP_RACK_GP_INCREASE_CA:
RACK_OPTS_INC(tcp_gp_inc_ca);
ca = optval;
if (ca < 100) {
error = EINVAL;
break;
}
rack->r_ctl.rack_per_of_gp_ca = ca;
rack_log_pacing_delay_calc(rack,
rack->r_ctl.rack_per_of_gp_ss,
rack->r_ctl.rack_per_of_gp_ca,
rack->r_ctl.rack_per_of_gp_rec, 0, 0, 1,
__LINE__, NULL, 0);
break;
case TCP_RACK_GP_INCREASE_SS:
RACK_OPTS_INC(tcp_gp_inc_ss);
ss = optval;
if (ss < 100) {
error = EINVAL;
break;
}
rack->r_ctl.rack_per_of_gp_ss = ss;
rack_log_pacing_delay_calc(rack,
rack->r_ctl.rack_per_of_gp_ss,
rack->r_ctl.rack_per_of_gp_ca,
rack->r_ctl.rack_per_of_gp_rec, 0, 0, 1,
__LINE__, NULL, 0);
break;
case TCP_RACK_RR_CONF:
RACK_OPTS_INC(tcp_rack_rrr_no_conf_rate);
if (optval && optval <= 3)
rack->r_rr_config = optval;
else
rack->r_rr_config = 0;
break;
case TCP_PACING_DND:
if (optval > 0)
rack->rc_pace_dnd = 1;
else
rack->rc_pace_dnd = 0;
break;
case TCP_HDWR_RATE_CAP:
RACK_OPTS_INC(tcp_hdwr_rate_cap);
if (optval) {
if (rack->r_rack_hw_rate_caps == 0)
rack->r_rack_hw_rate_caps = 1;
else
error = EALREADY;
} else {
rack->r_rack_hw_rate_caps = 0;
}
break;
case TCP_DGP_UPPER_BOUNDS:
{
uint8_t val;
val = optval & 0x0000ff;
rack->r_ctl.rack_per_upper_bound_ca = val;
val = (optval >> 16) & 0x0000ff;
rack->r_ctl.rack_per_upper_bound_ss = val;
break;
}
case TCP_SS_EEXIT:
if (optval > 0) {
rack->r_ctl.gp_rnd_thresh = optval & 0x0ff;
if (optval & 0x10000) {
rack->r_ctl.gate_to_fs = 1;
} else {
rack->r_ctl.gate_to_fs = 0;
}
if (optval & 0x20000) {
rack->r_ctl.use_gp_not_last = 1;
} else {
rack->r_ctl.use_gp_not_last = 0;
}
if (optval & 0xfffc0000) {
uint32_t v;
v = (optval >> 18) & 0x00003fff;
if (v >= 1000)
rack->r_ctl.gp_gain_req = v;
}
} else {
rack->rc_initial_ss_comp = 1;
rack->r_ctl.gp_rnd_thresh = 0;
}
break;
case TCP_RACK_SPLIT_LIMIT:
RACK_OPTS_INC(tcp_split_limit);
rack->r_ctl.rc_split_limit = optval;
break;
case TCP_BBR_HDWR_PACE:
RACK_OPTS_INC(tcp_hdwr_pacing);
if (optval){
if (rack->rack_hdrw_pacing == 0) {
rack->rack_hdw_pace_ena = 1;
rack->rack_attempt_hdwr_pace = 0;
} else
error = EALREADY;
} else {
rack->rack_hdw_pace_ena = 0;
#ifdef RATELIMIT
if (rack->r_ctl.crte != NULL) {
rack->rack_hdrw_pacing = 0;
rack->rack_attempt_hdwr_pace = 0;
tcp_rel_pacing_rate(rack->r_ctl.crte, tp);
rack->r_ctl.crte = NULL;
}
#endif
}
break;
case TCP_RACK_PRR_SENDALOT:
RACK_OPTS_INC(tcp_rack_prr_sendalot);
rack->r_ctl.rc_prr_sendalot = optval;
break;
case TCP_RACK_MIN_TO:
RACK_OPTS_INC(tcp_rack_min_to);
rack->r_ctl.rc_min_to = optval;
break;
case TCP_RACK_EARLY_SEG:
RACK_OPTS_INC(tcp_rack_early_seg);
rack->r_ctl.rc_early_recovery_segs = optval;
break;
case TCP_RACK_ENABLE_HYSTART:
{
if (optval) {
tp->t_ccv.flags |= CCF_HYSTART_ALLOWED;
if (rack_do_hystart > RACK_HYSTART_ON)
tp->t_ccv.flags |= CCF_HYSTART_CAN_SH_CWND;
if (rack_do_hystart > RACK_HYSTART_ON_W_SC)
tp->t_ccv.flags |= CCF_HYSTART_CONS_SSTH;
} else {
tp->t_ccv.flags &= ~(CCF_HYSTART_ALLOWED|CCF_HYSTART_CAN_SH_CWND|CCF_HYSTART_CONS_SSTH);
}
}
break;
case TCP_RACK_REORD_THRESH:
RACK_OPTS_INC(tcp_rack_reord_thresh);
if ((optval > 0) && (optval < 31))
rack->r_ctl.rc_reorder_shift = optval;
else
error = EINVAL;
break;
case TCP_RACK_REORD_FADE:
RACK_OPTS_INC(tcp_rack_reord_fade);
rack->r_ctl.rc_reorder_fade = optval;
break;
case TCP_RACK_TLP_THRESH:
RACK_OPTS_INC(tcp_rack_tlp_thresh);
if (optval)
rack->r_ctl.rc_tlp_threshold = optval;
else
error = EINVAL;
break;
case TCP_BBR_USE_RACK_RR:
RACK_OPTS_INC(tcp_rack_rr);
if (optval)
rack->use_rack_rr = 1;
else
rack->use_rack_rr = 0;
break;
case TCP_RACK_PKT_DELAY:
RACK_OPTS_INC(tcp_rack_pkt_delay);
rack->r_ctl.rc_pkt_delay = optval;
break;
case TCP_DELACK:
RACK_OPTS_INC(tcp_rack_delayed_ack);
if (optval == 0)
tp->t_delayed_ack = 0;
else
tp->t_delayed_ack = 1;
if (tp->t_flags & TF_DELACK) {
tp->t_flags &= ~TF_DELACK;
tp->t_flags |= TF_ACKNOW;
NET_EPOCH_ENTER(et);
rack_output(tp);
NET_EPOCH_EXIT(et);
}
break;
case TCP_BBR_RACK_RTT_USE:
RACK_OPTS_INC(tcp_rack_rtt_use);
if ((optval != USE_RTT_HIGH) &&
(optval != USE_RTT_LOW) &&
(optval != USE_RTT_AVG))
error = EINVAL;
else
rack->r_ctl.rc_rate_sample_method = optval;
break;
case TCP_HONOR_HPTS_MIN:
RACK_OPTS_INC(tcp_honor_hpts);
if (optval) {
rack->r_use_hpts_min = 1;
if ((optval > 1) && (optval <= 80)) {
rack->r_ctl.max_reduction = optval;
}
} else
rack->r_use_hpts_min = 0;
break;
case TCP_REC_IS_DYN:
RACK_OPTS_INC(tcp_dyn_rec);
if (optval)
rack->rc_gp_no_rec_chg = 1;
else
rack->rc_gp_no_rec_chg = 0;
break;
case TCP_NO_TIMELY:
RACK_OPTS_INC(tcp_notimely);
if (optval) {
rack->rc_skip_timely = 1;
rack->r_ctl.rack_per_of_gp_rec = 90;
rack->r_ctl.rack_per_of_gp_ca = 100;
rack->r_ctl.rack_per_of_gp_ss = 250;
} else {
rack->rc_skip_timely = 0;
}
break;
case TCP_GP_USE_LTBW:
if (optval == 0) {
rack->use_lesser_lt_bw = 0;
rack->dis_lt_bw = 1;
} else if (optval == 1) {
rack->use_lesser_lt_bw = 1;
rack->dis_lt_bw = 0;
} else if (optval == 2) {
rack->use_lesser_lt_bw = 0;
rack->dis_lt_bw = 0;
}
break;
case TCP_DATA_AFTER_CLOSE:
RACK_OPTS_INC(tcp_data_after_close);
if (optval)
rack->rc_allow_data_af_clo = 1;
else
rack->rc_allow_data_af_clo = 0;
break;
default:
break;
}
tcp_log_socket_option(tp, sopt_name, optval, error);
return (error);
}
static void
rack_inherit(struct tcpcb *tp, struct inpcb *parent)
{
struct tcpcb *par;
struct tcp_rack *dest, *src;
int cnt = 0;
par = intotcpcb(parent);
if (par->t_fb != tp->t_fb) {
tcp_log_socket_option(tp, 0, 0, 1);
return;
}
dest = (struct tcp_rack *)tp->t_fb_ptr;
src = (struct tcp_rack *)par->t_fb_ptr;
if ((src == NULL) || (dest == NULL)) {
tcp_log_socket_option(tp, 0, 0, 2);
return;
}
if ((src->dgp_on) && (dest->dgp_on == 0)) {
rack_set_dgp(dest);
cnt++;
}
if (dest->full_size_rxt != src->full_size_rxt) {
dest->full_size_rxt = src->full_size_rxt;
cnt++;
}
if (dest->shape_rxt_to_pacing_min != src->shape_rxt_to_pacing_min) {
dest->shape_rxt_to_pacing_min = src->shape_rxt_to_pacing_min;
cnt++;
}
if (dest->rc_rack_tmr_std_based != src->rc_rack_tmr_std_based) {
dest->rc_rack_tmr_std_based = src->rc_rack_tmr_std_based;
cnt++;
}
if (dest->rc_rack_use_dsack != src->rc_rack_use_dsack) {
dest->rc_rack_use_dsack = src->rc_rack_use_dsack;
cnt++;
}
if (dest->r_ctl.pace_len_divisor != src->r_ctl.pace_len_divisor) {
dest->r_ctl.pace_len_divisor = src->r_ctl.pace_len_divisor;
cnt++;
}
if (src->rack_hibeta != dest->rack_hibeta) {
cnt++;
if (src->rack_hibeta) {
dest->r_ctl.rc_saved_beta = src->r_ctl.rc_saved_beta;
dest->rack_hibeta = 1;
} else {
dest->rack_hibeta = 0;
}
}
if (dest->r_ctl.timer_slop != src->r_ctl.timer_slop) {
dest->r_ctl.timer_slop = src->r_ctl.timer_slop;
cnt++;
}
if (dest->r_ctl.rc_saved_beta_ecn != src->r_ctl.rc_saved_beta_ecn) {
dest->r_ctl.rc_saved_beta_ecn = src->r_ctl.rc_saved_beta_ecn;
cnt++;
}
if (dest->r_ctl.req_measurements != src->r_ctl.req_measurements) {
dest->r_ctl.req_measurements = src->r_ctl.req_measurements;
cnt++;
}
if (dest->r_up_only != src->r_up_only) {
dest->r_up_only = src->r_up_only;
cnt++;
}
if (dest->r_ctl.fillcw_cap != src->r_ctl.fillcw_cap) {
dest->r_ctl.fillcw_cap = src->r_ctl.fillcw_cap;
cnt++;
}
if (dest->r_ctl.bw_rate_cap != src->r_ctl.bw_rate_cap) {
dest->r_ctl.bw_rate_cap = src->r_ctl.bw_rate_cap;
cnt++;
}
if (dest->r_ctl.side_chan_dis_mask != src->r_ctl.side_chan_dis_mask) {
dest->r_ctl.side_chan_dis_mask = src->r_ctl.side_chan_dis_mask;
cnt++;
}
if (dest->r_limit_scw != src->r_limit_scw) {
dest->r_limit_scw = src->r_limit_scw;
cnt++;
}
if (dest->rc_pace_to_cwnd != src->rc_pace_to_cwnd) {
dest->rc_pace_to_cwnd = src->rc_pace_to_cwnd;
cnt++;
}
if (dest->rc_pace_fill_if_rttin_range != src->rc_pace_fill_if_rttin_range) {
dest->rc_pace_fill_if_rttin_range = src->rc_pace_fill_if_rttin_range;
cnt++;
}
if (dest->rtt_limit_mul != src->rtt_limit_mul) {
dest->rtt_limit_mul = src->rtt_limit_mul;
cnt++;
}
if (dest->r_ctl.rc_no_push_at_mrtt != src->r_ctl.rc_no_push_at_mrtt) {
dest->r_ctl.rc_no_push_at_mrtt = src->r_ctl.rc_no_push_at_mrtt;
cnt++;
}
if (dest->rack_enable_scwnd != src->rack_enable_scwnd) {
dest->rack_enable_scwnd = src->rack_enable_scwnd;
cnt++;
}
if (dest->r_use_cmp_ack != src->r_use_cmp_ack) {
dest->r_use_cmp_ack = src->r_use_cmp_ack;
cnt++;
}
if (dest->r_mbuf_queue != src->r_mbuf_queue) {
dest->r_mbuf_queue = src->r_mbuf_queue;
cnt++;
}
if (dest->r_mbuf_queue != src->r_mbuf_queue) {
dest->r_mbuf_queue = src->r_mbuf_queue;
cnt++;
}
if (dest->r_mbuf_queue || dest->rc_always_pace || dest->r_use_cmp_ack) {
tp->t_flags2 |= TF2_SUPPORTS_MBUFQ;
} else {
tp->t_flags2 &= ~TF2_SUPPORTS_MBUFQ;
}
if (dest->r_use_cmp_ack && TCPS_HAVEESTABLISHED(tp->t_state)) {
tp->t_flags2 |= TF2_MBUF_ACKCMP;
}
if (dest->rack_rec_nonrxt_use_cr != src->rack_rec_nonrxt_use_cr) {
dest->rack_rec_nonrxt_use_cr = src->rack_rec_nonrxt_use_cr;
cnt++;
}
if (dest->rack_no_prr != src->rack_no_prr) {
dest->rack_no_prr = src->rack_no_prr;
cnt++;
}
if (dest->no_prr_addback != src->no_prr_addback) {
dest->no_prr_addback = src->no_prr_addback;
cnt++;
}
if (dest->cspr_is_fcc != src->cspr_is_fcc) {
dest->cspr_is_fcc = src->cspr_is_fcc;
cnt++;
}
if (dest->rc_gp_dyn_mul != src->rc_gp_dyn_mul) {
dest->rc_gp_dyn_mul = src->rc_gp_dyn_mul;
cnt++;
}
if (dest->r_ctl.rack_per_of_gp_ca != src->r_ctl.rack_per_of_gp_ca) {
dest->r_ctl.rack_per_of_gp_ca = src->r_ctl.rack_per_of_gp_ca;
cnt++;
}
if (dest->rack_tlp_threshold_use != src->rack_tlp_threshold_use) {
dest->rack_tlp_threshold_use = src->rack_tlp_threshold_use;
cnt++;
}
if (dest->r_ctl.init_rate != src->r_ctl.init_rate) {
dest->r_ctl.init_rate = src->r_ctl.init_rate;
cnt++;
}
if (dest->rc_force_max_seg != src->rc_force_max_seg) {
dest->rc_force_max_seg = src->rc_force_max_seg;
cnt++;
}
if (dest->r_ctl.rc_user_set_min_segs != src->r_ctl.rc_user_set_min_segs) {
dest->r_ctl.rc_user_set_min_segs = src->r_ctl.rc_user_set_min_segs;
cnt++;
}
if (dest->r_ctl.rc_fixed_pacing_rate_ca != src->r_ctl.rc_fixed_pacing_rate_ca) {
dest->r_ctl.rc_fixed_pacing_rate_ca = src->r_ctl.rc_fixed_pacing_rate_ca;
cnt++;
}
if (dest->r_ctl.rc_fixed_pacing_rate_ss != src->r_ctl.rc_fixed_pacing_rate_ss) {
dest->r_ctl.rc_fixed_pacing_rate_ss = src->r_ctl.rc_fixed_pacing_rate_ss;
cnt++;
}
if (dest->r_ctl.rc_fixed_pacing_rate_rec != src->r_ctl.rc_fixed_pacing_rate_rec) {
dest->r_ctl.rc_fixed_pacing_rate_rec = src->r_ctl.rc_fixed_pacing_rate_rec;
cnt++;
}
if (dest->r_ctl.rack_per_of_gp_rec != src->r_ctl.rack_per_of_gp_rec) {
dest->r_ctl.rack_per_of_gp_rec = src->r_ctl.rack_per_of_gp_rec;
cnt++;
}
if (dest->r_ctl.rack_per_of_gp_ca != src->r_ctl.rack_per_of_gp_ca) {
dest->r_ctl.rack_per_of_gp_ca = src->r_ctl.rack_per_of_gp_ca;
cnt++;
}
if (dest->r_ctl.rack_per_of_gp_ss != src->r_ctl.rack_per_of_gp_ss) {
dest->r_ctl.rack_per_of_gp_ss = src->r_ctl.rack_per_of_gp_ss;
cnt++;
}
if (dest->r_rr_config != src->r_rr_config) {
dest->r_rr_config = src->r_rr_config;
cnt++;
}
if (dest->rc_pace_dnd != src->rc_pace_dnd) {
dest->rc_pace_dnd = src->rc_pace_dnd;
cnt++;
}
if (dest->r_rack_hw_rate_caps != src->r_rack_hw_rate_caps) {
dest->r_rack_hw_rate_caps = src->r_rack_hw_rate_caps;
cnt++;
}
if (dest->r_ctl.rack_per_upper_bound_ca != src->r_ctl.rack_per_upper_bound_ca) {
dest->r_ctl.rack_per_upper_bound_ca = src->r_ctl.rack_per_upper_bound_ca;
cnt++;
}
if (dest->r_ctl.rack_per_upper_bound_ss != src->r_ctl.rack_per_upper_bound_ss) {
dest->r_ctl.rack_per_upper_bound_ss = src->r_ctl.rack_per_upper_bound_ss;
cnt++;
}
if (dest->r_ctl.gp_rnd_thresh != src->r_ctl.gp_rnd_thresh) {
dest->r_ctl.gp_rnd_thresh = src->r_ctl.gp_rnd_thresh;
cnt++;
}
if (dest->r_ctl.gate_to_fs != src->r_ctl.gate_to_fs) {
dest->r_ctl.gate_to_fs = src->r_ctl.gate_to_fs;
cnt++;
}
if (dest->r_ctl.use_gp_not_last != src->r_ctl.use_gp_not_last) {
dest->r_ctl.use_gp_not_last = src->r_ctl.use_gp_not_last;
cnt++;
}
if (dest->r_ctl.gp_gain_req != src->r_ctl.gp_gain_req) {
dest->r_ctl.gp_gain_req = src->r_ctl.gp_gain_req;
cnt++;
}
if (dest->rack_hdw_pace_ena != src->rack_hdw_pace_ena) {
dest->rack_hdw_pace_ena = src->rack_hdw_pace_ena;
cnt++;
}
if (dest->rack_attempt_hdwr_pace != src->rack_attempt_hdwr_pace) {
dest->rack_attempt_hdwr_pace = src->rack_attempt_hdwr_pace;
cnt++;
}
if (dest->r_ctl.rc_prr_sendalot != src->r_ctl.rc_prr_sendalot) {
dest->r_ctl.rc_prr_sendalot = src->r_ctl.rc_prr_sendalot;
cnt++;
}
if (dest->r_ctl.rc_min_to != src->r_ctl.rc_min_to) {
dest->r_ctl.rc_min_to = src->r_ctl.rc_min_to;
cnt++;
}
if (dest->r_ctl.rc_early_recovery_segs != src->r_ctl.rc_early_recovery_segs) {
dest->r_ctl.rc_early_recovery_segs = src->r_ctl.rc_early_recovery_segs;
cnt++;
}
if (par->t_ccv.flags != tp->t_ccv.flags) {
cnt++;
if (par->t_ccv.flags & CCF_HYSTART_ALLOWED) {
tp->t_ccv.flags |= CCF_HYSTART_ALLOWED;
if (rack_do_hystart > RACK_HYSTART_ON)
tp->t_ccv.flags |= CCF_HYSTART_CAN_SH_CWND;
if (rack_do_hystart > RACK_HYSTART_ON_W_SC)
tp->t_ccv.flags |= CCF_HYSTART_CONS_SSTH;
} else {
tp->t_ccv.flags &= ~(CCF_HYSTART_ALLOWED|CCF_HYSTART_CAN_SH_CWND|CCF_HYSTART_CONS_SSTH);
}
}
if (dest->r_ctl.rc_reorder_shift != src->r_ctl.rc_reorder_shift) {
dest->r_ctl.rc_reorder_shift = src->r_ctl.rc_reorder_shift;
cnt++;
}
if (dest->r_ctl.rc_reorder_fade != src->r_ctl.rc_reorder_fade) {
dest->r_ctl.rc_reorder_fade = src->r_ctl.rc_reorder_fade;
cnt++;
}
if (dest->r_ctl.rc_tlp_threshold != src->r_ctl.rc_tlp_threshold) {
dest->r_ctl.rc_tlp_threshold = src->r_ctl.rc_tlp_threshold;
cnt++;
}
if (dest->use_rack_rr != src->use_rack_rr) {
dest->use_rack_rr = src->use_rack_rr;
cnt++;
}
if (dest->r_ctl.rc_pkt_delay != src->r_ctl.rc_pkt_delay) {
dest->r_ctl.rc_pkt_delay = src->r_ctl.rc_pkt_delay;
cnt++;
}
if (dest->r_ctl.rc_rate_sample_method != src->r_ctl.rc_rate_sample_method) {
dest->r_ctl.rc_rate_sample_method = src->r_ctl.rc_rate_sample_method;
cnt++;
}
if (dest->r_use_hpts_min != src->r_use_hpts_min) {
dest->r_use_hpts_min = src->r_use_hpts_min;
cnt++;
}
if (dest->r_ctl.max_reduction != src->r_ctl.max_reduction) {
dest->r_ctl.max_reduction = src->r_ctl.max_reduction;
cnt++;
}
if (dest->rc_gp_no_rec_chg != src->rc_gp_no_rec_chg) {
dest->rc_gp_no_rec_chg = src->rc_gp_no_rec_chg;
cnt++;
}
if (dest->rc_skip_timely != src->rc_skip_timely) {
dest->rc_skip_timely = src->rc_skip_timely;
cnt++;
}
if (dest->rc_allow_data_af_clo != src->rc_allow_data_af_clo) {
dest->rc_allow_data_af_clo = src->rc_allow_data_af_clo;
cnt++;
}
if (src->use_lesser_lt_bw != dest->use_lesser_lt_bw) {
dest->use_lesser_lt_bw = src->use_lesser_lt_bw;
cnt++;
}
if (dest->dis_lt_bw != src->dis_lt_bw) {
dest->dis_lt_bw = src->dis_lt_bw;
cnt++;
}
tcp_log_socket_option(tp, 0, cnt, 0);
}
static void
rack_apply_deferred_options(struct tcp_rack *rack)
{
struct deferred_opt_list *dol, *sdol;
uint32_t s_optval;
TAILQ_FOREACH_SAFE(dol, &rack->r_ctl.opt_list, next, sdol) {
TAILQ_REMOVE(&rack->r_ctl.opt_list, dol, next);
s_optval = (uint32_t)dol->optval;
(void)rack_process_option(rack->rc_tp, rack, dol->optname, s_optval, dol->optval, NULL);
free(dol, M_TCPDO);
}
}
static void
rack_hw_tls_change(struct tcpcb *tp, int chg)
{
struct tcp_rack *rack;
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (chg)
rack->r_ctl.fsb.hw_tls = 1;
else
rack->r_ctl.fsb.hw_tls = 0;
}
static int
rack_pru_options(struct tcpcb *tp, int flags)
{
if (flags & PRUS_OOB)
return (EOPNOTSUPP);
return (0);
}
static bool
rack_wake_check(struct tcpcb *tp)
{
struct tcp_rack *rack;
struct timeval tv;
uint32_t cts;
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (rack->r_ctl.rc_hpts_flags) {
cts = tcp_get_usecs(&tv);
if ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == PACE_PKT_OUTPUT){
if (TSTMP_GEQ(cts, rack->r_ctl.rc_last_output_to))
return (true);
} else if ((rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) != 0) {
if (TSTMP_GEQ(cts, rack->r_ctl.rc_timer_exp))
return (true);
}
}
return (false);
}
static struct tcp_function_block __tcp_rack = {
.tfb_tcp_block_name = __XSTRING(STACKNAME),
.tfb_tcp_output = rack_output,
.tfb_do_queued_segments = ctf_do_queued_segments,
.tfb_do_segment_nounlock = rack_do_segment_nounlock,
.tfb_tcp_do_segment = rack_do_segment,
.tfb_tcp_ctloutput = rack_ctloutput,
.tfb_tcp_fb_init = rack_init,
.tfb_tcp_fb_fini = rack_fini,
.tfb_tcp_timer_stop_all = rack_stopall,
.tfb_tcp_rexmit_tmr = rack_remxt_tmr,
.tfb_tcp_handoff_ok = rack_handoff_ok,
.tfb_tcp_mtu_chg = rack_mtu_change,
.tfb_pru_options = rack_pru_options,
.tfb_hwtls_change = rack_hw_tls_change,
.tfb_chg_query = rack_chg_query,
.tfb_switch_failed = rack_switch_failed,
.tfb_early_wake_check = rack_wake_check,
.tfb_compute_pipe = rack_compute_pipe,
.tfb_stack_info = rack_stack_information,
.tfb_inherit = rack_inherit,
.tfb_flags = TCP_FUNC_OUTPUT_CANDROP | TCP_FUNC_DEFAULT_OK,
};
static int
rack_set_sockopt(struct tcpcb *tp, struct sockopt *sopt)
{
struct inpcb *inp = tptoinpcb(tp);
#ifdef INET
struct ip *ip;
#endif
struct tcp_rack *rack;
struct tcp_hybrid_req hybrid;
uint64_t loptval;
int32_t error = 0, optval;
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (rack == NULL) {
INP_WUNLOCK(inp);
return (EINVAL);
}
#ifdef INET
ip = (struct ip *)rack->r_ctl.fsb.tcp_ip_hdr;
#endif
switch (sopt->sopt_level) {
#ifdef INET6
case IPPROTO_IPV6:
MPASS(inp->inp_vflag & INP_IPV6PROTO);
switch (sopt->sopt_name) {
case IPV6_USE_MIN_MTU:
tcp6_use_min_mtu(tp);
break;
}
INP_WUNLOCK(inp);
return (0);
#endif
#ifdef INET
case IPPROTO_IP:
switch (sopt->sopt_name) {
case IP_TOS:
ip->ip_tos = rack->rc_inp->inp_ip_tos;
break;
case IP_TTL:
ip->ip_ttl = rack->rc_inp->inp_ip_ttl;
break;
}
INP_WUNLOCK(inp);
return (0);
#endif
#ifdef SO_PEERPRIO
case SOL_SOCKET:
switch (sopt->sopt_name) {
case SO_PEERPRIO:
if (inp->inp_socket) {
rack->client_bufferlvl = inp->inp_socket->so_peerprio;
}
break;
}
INP_WUNLOCK(inp);
return (0);
#endif
case IPPROTO_TCP:
switch (sopt->sopt_name) {
case TCP_RACK_TLP_REDUCE:
case TCP_RACK_PACE_ALWAYS:
case TCP_BBR_RACK_INIT_RATE:
case TCP_RACK_PACE_MIN_SEG:
case TCP_RACK_PACE_MAX_SEG:
case TCP_RACK_FORCE_MSEG:
case TCP_RACK_PACE_RATE_CA:
case TCP_RACK_PACE_RATE_SS:
case TCP_RACK_PACE_RATE_REC:
case TCP_RACK_GP_INCREASE_CA:
case TCP_RACK_GP_INCREASE_SS:
case TCP_RACK_GP_INCREASE_REC:
case TCP_RACK_RR_CONF:
case TCP_BBR_HDWR_PACE:
case TCP_HDWR_RATE_CAP:
case TCP_PACING_RATE_CAP:
case TCP_HDWR_UP_ONLY:
case TCP_FILLCW_RATE_CAP:
case TCP_RACK_PACING_BETA_ECN:
case TCP_RACK_PACE_TO_FILL:
case TCP_DELACK:
case TCP_RACK_PRR_SENDALOT:
case TCP_RACK_MIN_TO:
case TCP_RACK_EARLY_SEG:
case TCP_RACK_REORD_THRESH:
case TCP_RACK_REORD_FADE:
case TCP_RACK_TLP_THRESH:
case TCP_RACK_PKT_DELAY:
case TCP_RACK_TLP_USE:
case TCP_BBR_RACK_RTT_USE:
case TCP_BBR_USE_RACK_RR:
case TCP_NO_PRR:
case TCP_TIMELY_DYN_ADJ:
case TCP_DATA_AFTER_CLOSE:
case TCP_RACK_NONRXT_CFG_RATE:
case TCP_SHARED_CWND_ENABLE:
case TCP_RACK_MBUF_QUEUE:
case TCP_RACK_NO_PUSH_AT_MAX:
case TCP_SHARED_CWND_TIME_LIMIT:
case TCP_RACK_PROFILE:
case TCP_SIDECHAN_DIS:
case TCP_HYBRID_PACING:
case TCP_USE_CMP_ACKS:
case TCP_RACK_ABC_VAL:
case TCP_REC_ABC_VAL:
case TCP_RACK_MEASURE_CNT:
case TCP_DEFER_OPTIONS:
case TCP_RACK_DSACK_OPT:
case TCP_RACK_TIMER_SLOP:
case TCP_RACK_ENABLE_HYSTART:
case TCP_RACK_SET_RXT_OPTIONS:
case TCP_RACK_HI_BETA:
case TCP_RACK_SPLIT_LIMIT:
case TCP_SS_EEXIT:
case TCP_DGP_UPPER_BOUNDS:
case TCP_RACK_PACING_DIVISOR:
case TCP_PACING_DND:
case TCP_NO_TIMELY:
case RACK_CSPR_IS_FCC:
case TCP_HONOR_HPTS_MIN:
case TCP_REC_IS_DYN:
case TCP_GP_USE_LTBW:
goto process_opt;
break;
default:
return (tcp_default_ctloutput(tp, sopt));
break;
}
default:
INP_WUNLOCK(inp);
return (0);
}
process_opt:
INP_WUNLOCK(inp);
if ((sopt->sopt_name == TCP_PACING_RATE_CAP) ||
(sopt->sopt_name == TCP_FILLCW_RATE_CAP)) {
error = sooptcopyin(sopt, &loptval, sizeof(loptval), sizeof(loptval));
optval = (uint32_t)loptval;
} else if (sopt->sopt_name == TCP_HYBRID_PACING) {
error = sooptcopyin(sopt, &hybrid, sizeof(hybrid), sizeof(hybrid));
} else {
error = sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval));
loptval = optval;
}
if (error)
return (error);
INP_WLOCK(inp);
if (tp->t_fb != &__tcp_rack) {
INP_WUNLOCK(inp);
return (ENOPROTOOPT);
}
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (rack->defer_options && (rack->gp_ready == 0) &&
(sopt->sopt_name != TCP_DEFER_OPTIONS) &&
(sopt->sopt_name != TCP_HYBRID_PACING) &&
(sopt->sopt_name != TCP_RACK_SET_RXT_OPTIONS) &&
(sopt->sopt_name != TCP_RACK_PACING_BETA_ECN) &&
(sopt->sopt_name != TCP_RACK_MEASURE_CNT)) {
if (rack_add_deferred_option(rack, sopt->sopt_name, loptval)) {
INP_WUNLOCK(inp);
return (0);
} else {
INP_WUNLOCK(inp);
return (ENOMEM);
}
}
error = rack_process_option(tp, rack, sopt->sopt_name, optval, loptval, &hybrid);
INP_WUNLOCK(inp);
return (error);
}
static void
rack_fill_info(struct tcpcb *tp, struct tcp_info *ti)
{
INP_WLOCK_ASSERT(tptoinpcb(tp));
bzero(ti, sizeof(*ti));
ti->tcpi_state = tp->t_state;
if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
if (tp->t_flags & TF_SACK_PERMIT)
ti->tcpi_options |= TCPI_OPT_SACK;
if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
ti->tcpi_options |= TCPI_OPT_WSCALE;
ti->tcpi_snd_wscale = tp->snd_scale;
ti->tcpi_rcv_wscale = tp->rcv_scale;
}
if (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))
ti->tcpi_options |= TCPI_OPT_ECN;
if (tp->t_flags & TF_FASTOPEN)
ti->tcpi_options |= TCPI_OPT_TFO;
ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
ti->tcpi_rtt = tp->t_srtt;
ti->tcpi_rttvar = tp->t_rttvar;
ti->tcpi_rto = tp->t_rxtcur;
ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
ti->tcpi_snd_cwnd = tp->snd_cwnd;
ti->tcpi_rcv_space = tp->rcv_wnd;
ti->tcpi_rcv_nxt = tp->rcv_nxt;
ti->tcpi_snd_wnd = tp->snd_wnd;
ti->tcpi_snd_bwnd = 0;
ti->tcpi_snd_nxt = tp->snd_nxt;
ti->tcpi_snd_mss = tp->t_maxseg;
ti->tcpi_rcv_mss = tp->t_maxseg;
ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
ti->tcpi_snd_zerowin = tp->t_sndzerowin;
ti->tcpi_total_tlp = tp->t_sndtlppack;
ti->tcpi_total_tlp_bytes = tp->t_sndtlpbyte;
ti->tcpi_rttmin = tp->t_rttlow;
#ifdef NETFLIX_STATS
memcpy(&ti->tcpi_rxsyninfo, &tp->t_rxsyninfo, sizeof(struct tcpsyninfo));
#endif
#ifdef TCP_OFFLOAD
if (tp->t_flags & TF_TOE) {
ti->tcpi_options |= TCPI_OPT_TOE;
tcp_offload_tcp_info(tp, ti);
}
#endif
}
static int
rack_get_sockopt(struct tcpcb *tp, struct sockopt *sopt)
{
struct inpcb *inp = tptoinpcb(tp);
struct tcp_rack *rack;
int32_t error, optval;
uint64_t val, loptval;
struct tcp_info ti;
error = 0;
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (rack == NULL) {
INP_WUNLOCK(inp);
return (EINVAL);
}
switch (sopt->sopt_name) {
case TCP_INFO:
rack_fill_info(tp, &ti);
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &ti, sizeof ti);
return (error);
case TCP_RACK_PACING_BETA:
if (strcmp(tp->t_cc->name, CCALGONAME_NEWRENO) != 0)
error = EINVAL;
else if (rack->rc_pacing_cc_set == 0)
optval = rack->r_ctl.rc_saved_beta;
else {
if (tp->t_ccv.cc_data)
optval = ((struct newreno *)tp->t_ccv.cc_data)->beta;
else
error = EINVAL;
}
break;
case TCP_RACK_PACING_BETA_ECN:
if (strcmp(tp->t_cc->name, CCALGONAME_NEWRENO) != 0)
error = EINVAL;
else if (rack->rc_pacing_cc_set == 0)
optval = rack->r_ctl.rc_saved_beta_ecn;
else {
if (tp->t_ccv.cc_data)
optval = ((struct newreno *)tp->t_ccv.cc_data)->beta_ecn;
else
error = EINVAL;
}
break;
case TCP_RACK_DSACK_OPT:
optval = 0;
if (rack->rc_rack_tmr_std_based) {
optval |= 1;
}
if (rack->rc_rack_use_dsack) {
optval |= 2;
}
break;
case TCP_RACK_ENABLE_HYSTART:
{
if (tp->t_ccv.flags & CCF_HYSTART_ALLOWED) {
optval = RACK_HYSTART_ON;
if (tp->t_ccv.flags & CCF_HYSTART_CAN_SH_CWND)
optval = RACK_HYSTART_ON_W_SC;
if (tp->t_ccv.flags & CCF_HYSTART_CONS_SSTH)
optval = RACK_HYSTART_ON_W_SC_C;
} else {
optval = RACK_HYSTART_OFF;
}
}
break;
case TCP_RACK_DGP_IN_REC:
error = EINVAL;
break;
case TCP_RACK_HI_BETA:
optval = rack->rack_hibeta;
break;
case TCP_DEFER_OPTIONS:
optval = rack->defer_options;
break;
case TCP_RACK_MEASURE_CNT:
optval = rack->r_ctl.req_measurements;
break;
case TCP_REC_ABC_VAL:
optval = rack->r_use_labc_for_rec;
break;
case TCP_RACK_ABC_VAL:
optval = rack->rc_labc;
break;
case TCP_HDWR_UP_ONLY:
optval= rack->r_up_only;
break;
case TCP_FILLCW_RATE_CAP:
loptval = rack->r_ctl.fillcw_cap;
break;
case TCP_PACING_RATE_CAP:
loptval = rack->r_ctl.bw_rate_cap;
break;
case TCP_RACK_PROFILE:
error = EINVAL;
break;
case TCP_SIDECHAN_DIS:
optval = rack->r_ctl.side_chan_dis_mask;
break;
case TCP_HYBRID_PACING:
error = EINVAL;
break;
case TCP_USE_CMP_ACKS:
optval = rack->r_use_cmp_ack;
break;
case TCP_RACK_PACE_TO_FILL:
optval = rack->rc_pace_to_cwnd;
break;
case TCP_RACK_NO_PUSH_AT_MAX:
optval = rack->r_ctl.rc_no_push_at_mrtt;
break;
case TCP_SHARED_CWND_ENABLE:
optval = rack->rack_enable_scwnd;
break;
case TCP_RACK_NONRXT_CFG_RATE:
optval = rack->rack_rec_nonrxt_use_cr;
break;
case TCP_NO_PRR:
if (rack->rack_no_prr == 1)
optval = 1;
else if (rack->no_prr_addback == 1)
optval = 2;
else
optval = 0;
break;
case TCP_GP_USE_LTBW:
if (rack->dis_lt_bw) {
optval = 0;
} else if (rack->use_lesser_lt_bw) {
optval = 1;
} else {
optval = 2;
}
break;
case TCP_RACK_DO_DETECTION:
error = EINVAL;
break;
case TCP_RACK_MBUF_QUEUE:
optval = rack->r_mbuf_queue;
break;
case RACK_CSPR_IS_FCC:
optval = rack->cspr_is_fcc;
break;
case TCP_TIMELY_DYN_ADJ:
optval = rack->rc_gp_dyn_mul;
break;
case TCP_BBR_IWINTSO:
error = EINVAL;
break;
case TCP_RACK_TLP_REDUCE:
optval = rack->r_ctl.rc_tlp_cwnd_reduce;
break;
case TCP_BBR_RACK_INIT_RATE:
val = rack->r_ctl.init_rate;
val *= 8;
val /= 1000;
optval = (uint32_t)val;
break;
case TCP_RACK_FORCE_MSEG:
optval = rack->rc_force_max_seg;
break;
case TCP_RACK_PACE_MIN_SEG:
optval = rack->r_ctl.rc_user_set_min_segs;
break;
case TCP_RACK_PACE_MAX_SEG:
optval = rack->rc_user_set_max_segs;
break;
case TCP_RACK_PACE_ALWAYS:
optval = rack->rc_always_pace;
break;
case TCP_RACK_PRR_SENDALOT:
optval = rack->r_ctl.rc_prr_sendalot;
break;
case TCP_RACK_MIN_TO:
optval = rack->r_ctl.rc_min_to;
break;
case TCP_RACK_SPLIT_LIMIT:
optval = rack->r_ctl.rc_split_limit;
break;
case TCP_RACK_EARLY_SEG:
optval = rack->r_ctl.rc_early_recovery_segs;
break;
case TCP_RACK_REORD_THRESH:
optval = rack->r_ctl.rc_reorder_shift;
break;
case TCP_SS_EEXIT:
if (rack->r_ctl.gp_rnd_thresh) {
uint32_t v;
v = rack->r_ctl.gp_gain_req;
v <<= 17;
optval = v | (rack->r_ctl.gp_rnd_thresh & 0xff);
if (rack->r_ctl.gate_to_fs == 1)
optval |= 0x10000;
} else
optval = 0;
break;
case TCP_RACK_REORD_FADE:
optval = rack->r_ctl.rc_reorder_fade;
break;
case TCP_BBR_USE_RACK_RR:
optval = rack->use_rack_rr;
break;
case TCP_RACK_RR_CONF:
optval = rack->r_rr_config;
break;
case TCP_HDWR_RATE_CAP:
optval = rack->r_rack_hw_rate_caps;
break;
case TCP_BBR_HDWR_PACE:
optval = rack->rack_hdw_pace_ena;
break;
case TCP_RACK_TLP_THRESH:
optval = rack->r_ctl.rc_tlp_threshold;
break;
case TCP_RACK_PKT_DELAY:
optval = rack->r_ctl.rc_pkt_delay;
break;
case TCP_RACK_TLP_USE:
optval = rack->rack_tlp_threshold_use;
break;
case TCP_PACING_DND:
optval = rack->rc_pace_dnd;
break;
case TCP_RACK_PACE_RATE_CA:
optval = rack->r_ctl.rc_fixed_pacing_rate_ca;
break;
case TCP_RACK_PACE_RATE_SS:
optval = rack->r_ctl.rc_fixed_pacing_rate_ss;
break;
case TCP_RACK_PACE_RATE_REC:
optval = rack->r_ctl.rc_fixed_pacing_rate_rec;
break;
case TCP_DGP_UPPER_BOUNDS:
optval = rack->r_ctl.rack_per_upper_bound_ss;
optval <<= 16;
optval |= rack->r_ctl.rack_per_upper_bound_ca;
break;
case TCP_RACK_GP_INCREASE_SS:
optval = rack->r_ctl.rack_per_of_gp_ca;
break;
case TCP_RACK_GP_INCREASE_CA:
optval = rack->r_ctl.rack_per_of_gp_ss;
break;
case TCP_RACK_PACING_DIVISOR:
optval = rack->r_ctl.pace_len_divisor;
break;
case TCP_BBR_RACK_RTT_USE:
optval = rack->r_ctl.rc_rate_sample_method;
break;
case TCP_DELACK:
optval = tp->t_delayed_ack;
break;
case TCP_DATA_AFTER_CLOSE:
optval = rack->rc_allow_data_af_clo;
break;
case TCP_SHARED_CWND_TIME_LIMIT:
optval = rack->r_limit_scw;
break;
case TCP_HONOR_HPTS_MIN:
if (rack->r_use_hpts_min)
optval = rack->r_ctl.max_reduction;
else
optval = 0;
break;
case TCP_REC_IS_DYN:
optval = rack->rc_gp_no_rec_chg;
break;
case TCP_NO_TIMELY:
optval = rack->rc_skip_timely;
break;
case TCP_RACK_TIMER_SLOP:
optval = rack->r_ctl.timer_slop;
break;
default:
return (tcp_default_ctloutput(tp, sopt));
break;
}
INP_WUNLOCK(inp);
if (error == 0) {
if ((sopt->sopt_name == TCP_PACING_RATE_CAP) ||
(sopt->sopt_name == TCP_FILLCW_RATE_CAP))
error = sooptcopyout(sopt, &loptval, sizeof loptval);
else
error = sooptcopyout(sopt, &optval, sizeof optval);
}
return (error);
}
static int
rack_ctloutput(struct tcpcb *tp, struct sockopt *sopt)
{
if (sopt->sopt_dir == SOPT_SET) {
return (rack_set_sockopt(tp, sopt));
} else if (sopt->sopt_dir == SOPT_GET) {
return (rack_get_sockopt(tp, sopt));
} else {
panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir);
}
}
static const char *rack_stack_names[] = {
__XSTRING(STACKNAME),
#ifdef STACKALIAS
__XSTRING(STACKALIAS),
#endif
};
static int
rack_ctor(void *mem, int32_t size, void *arg, int32_t how)
{
memset(mem, 0, size);
return (0);
}
static void
rack_dtor(void *mem, int32_t size, void *arg)
{
}
static bool rack_mod_inited = false;
static int
tcp_addrack(module_t mod, int32_t type, void *data)
{
int32_t err = 0;
int num_stacks;
switch (type) {
case MOD_LOAD:
rack_zone = uma_zcreate(__XSTRING(MODNAME) "_map",
sizeof(struct rack_sendmap),
rack_ctor, rack_dtor, NULL, NULL, UMA_ALIGN_PTR, 0);
rack_pcb_zone = uma_zcreate(__XSTRING(MODNAME) "_pcb",
sizeof(struct tcp_rack),
rack_ctor, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0);
sysctl_ctx_init(&rack_sysctl_ctx);
rack_sysctl_root = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_STATIC_CHILDREN(_net_inet_tcp),
OID_AUTO,
#ifdef STACKALIAS
__XSTRING(STACKALIAS),
#else
__XSTRING(STACKNAME),
#endif
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"");
if (rack_sysctl_root == NULL) {
printf("Failed to add sysctl node\n");
err = EFAULT;
goto free_uma;
}
rack_init_sysctls();
num_stacks = nitems(rack_stack_names);
err = register_tcp_functions_as_names(&__tcp_rack, M_WAITOK,
rack_stack_names, &num_stacks);
if (err) {
printf("Failed to register %s stack name for "
"%s module\n", rack_stack_names[num_stacks],
__XSTRING(MODNAME));
sysctl_ctx_free(&rack_sysctl_ctx);
free_uma:
uma_zdestroy(rack_zone);
uma_zdestroy(rack_pcb_zone);
rack_counter_destroy();
printf("Failed to register rack module -- err:%d\n", err);
return (err);
}
tcp_lro_reg_mbufq();
rack_mod_inited = true;
break;
case MOD_QUIESCE:
err = deregister_tcp_functions(&__tcp_rack, true, false);
break;
case MOD_UNLOAD:
err = deregister_tcp_functions(&__tcp_rack, false, true);
if (err == EBUSY)
break;
if (rack_mod_inited) {
uma_zdestroy(rack_zone);
uma_zdestroy(rack_pcb_zone);
sysctl_ctx_free(&rack_sysctl_ctx);
rack_counter_destroy();
rack_mod_inited = false;
}
tcp_lro_dereg_mbufq();
err = 0;
break;
default:
return (EOPNOTSUPP);
}
return (err);
}
static moduledata_t tcp_rack = {
.name = __XSTRING(MODNAME),
.evhand = tcp_addrack,
.priv = 0
};
MODULE_VERSION(MODNAME, 1);
DECLARE_MODULE(MODNAME, tcp_rack, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
MODULE_DEPEND(MODNAME, tcphpts, 1, 1, 1);
#endif
