/*- * Copyright (C) 1997-2003 * Sony Computer Science Laboratories Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $KAME: altq_red.h,v 1.8 2003/07/10 12:07:49 kjc Exp $ */ #ifndef _ALTQ_ALTQ_RED_H_ #define _ALTQ_ALTQ_RED_H_ #include <net/altq/altq_classq.h> /* red flags */ #define REDF_ECN4 0x01 /* use packet marking for IPv4 packets */ #define REDF_ECN6 0x02 /* use packet marking for IPv6 packets */ #define REDF_ECN (REDF_ECN4 | REDF_ECN6) #define REDF_FLOWVALVE 0x04 /* use flowvalve (aka penalty-box) */ /* * simpler versions of red parameters and statistics used by other * disciplines (e.g., CBQ) */ struct redparams { int th_min; /* red min threshold */ int th_max; /* red max threshold */ int inv_pmax; /* inverse of max drop probability */ }; struct redstats { int q_avg; struct pktcntr xmit_cnt; struct pktcntr drop_cnt; u_int drop_forced; u_int drop_unforced; u_int marked_packets; }; #ifdef _KERNEL /* weight table structure for idle time calibration */ struct wtab { struct wtab *w_next; int w_weight; int w_param_max; int w_refcount; int32_t w_tab[32]; }; typedef struct red { int red_pkttime; /* average packet time in micro sec used for idle calibration */ int red_flags; /* red flags */ /* red parameters */ int red_weight; /* weight for EWMA */ int red_inv_pmax; /* inverse of max drop probability */ int red_thmin; /* red min threshold */ int red_thmax; /* red max threshold */ /* variables for internal use */ int red_wshift; /* log(red_weight) */ int red_thmin_s; /* th_min scaled by avgshift */ int red_thmax_s; /* th_max scaled by avgshift */ int red_probd; /* drop probability denominator */ int red_avg; /* queue len avg scaled by avgshift */ int red_count; /* packet count since last dropped/ marked packet */ int red_idle; /* queue was empty */ int red_old; /* avg is above th_min */ struct wtab *red_wtab; /* weight table */ struct timeval red_last; /* time when the queue becomes idle */ struct { struct pktcntr xmit_cnt; struct pktcntr drop_cnt; u_int drop_forced; u_int drop_unforced; u_int marked_packets; } red_stats; } red_t; /* red drop types */ #define DTYPE_NODROP 0 /* no drop */ #define DTYPE_FORCED 1 /* a "forced" drop */ #define DTYPE_EARLY 2 /* an "unforced" (early) drop */ extern red_t *red_alloc(int, int, int, int, int, int); extern void red_destroy(red_t *); extern void red_getstats(red_t *, struct redstats *); extern int red_addq(red_t *, class_queue_t *, struct mbuf *, struct altq_pktattr *); extern struct mbuf *red_getq(red_t *, class_queue_t *); extern int drop_early(int, int, int); extern int mark_ecn(struct mbuf *, struct altq_pktattr *, int); extern struct wtab *wtab_alloc(int); extern int wtab_destroy(struct wtab *); extern int32_t pow_w(struct wtab *, int); #endif /* _KERNEL */ #endif /* _ALTQ_ALTQ_RED_H_ */
