/*
 * libcxgbi.h: Chelsio common library for T3/T4 iSCSI driver.
 *
 * Copyright (c) 2010-2015 Chelsio Communications, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * Written by: Karen Xie (kxie@chelsio.com)
 * Written by: Rakesh Ranjan (rranjan@chelsio.com)
 */

#ifndef __LIBCXGBI_H__
#define __LIBCXGBI_H__

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/debugfs.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/scatterlist.h>
#include <linux/skbuff.h>
#include <linux/vmalloc.h>
#include <scsi/scsi_device.h>
#include <scsi/libiscsi_tcp.h>

#include <libcxgb_ppm.h>

enum cxgbi_dbg_flag {
        CXGBI_DBG_ISCSI,
        CXGBI_DBG_DDP,
        CXGBI_DBG_TOE,
        CXGBI_DBG_SOCK,

        CXGBI_DBG_PDU_TX,
        CXGBI_DBG_PDU_RX,
        CXGBI_DBG_DEV,
};

#define log_debug(level, fmt, ...)      \
        do {    \
                if (dbg_level & (level)) \
                        pr_info(fmt, ##__VA_ARGS__); \
        } while (0)

#define pr_info_ipaddr(fmt_trail,                                       \
                        addr1, addr2, args_trail...)                    \
do {                                                                    \
        if (!((1 << CXGBI_DBG_SOCK) & dbg_level))                       \
                break;                                                  \
        pr_info("%pISpc - %pISpc, " fmt_trail,                          \
                addr1, addr2, args_trail);                              \
} while (0)

/* max. connections per adapter */
#define CXGBI_MAX_CONN          16384

/* always allocate rooms for AHS */
#define SKB_TX_ISCSI_PDU_HEADER_MAX     \
        (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)

#define ISCSI_PDU_NONPAYLOAD_LEN        312 /* bhs(48) + ahs(256) + digest(8)*/

/*
 * align pdu size to multiple of 512 for better performance
 */
#define cxgbi_align_pdu_size(n) do { n = (n) & (~511); } while (0)

#define ULP2_MODE_ISCSI         2

#define ULP2_MAX_PKT_SIZE       16224
#define ULP2_MAX_PDU_PAYLOAD    \
        (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)

#define CXGBI_ULP2_MAX_ISO_PAYLOAD      65535

#define CXGBI_MAX_ISO_DATA_IN_SKB       \
        min_t(u32, MAX_SKB_FRAGS << PAGE_SHIFT, CXGBI_ULP2_MAX_ISO_PAYLOAD)

#define cxgbi_is_iso_config(csk)        ((csk)->cdev->skb_iso_txhdr)
#define cxgbi_is_iso_disabled(csk)      ((csk)->disable_iso)

/*
 * For iscsi connections HW may inserts digest bytes into the pdu. Those digest
 * bytes are not sent by the host but are part of the TCP payload and therefore
 * consume TCP sequence space.
 */
static const unsigned int ulp2_extra_len[] = { 0, 4, 4, 8 };
static inline unsigned int cxgbi_ulp_extra_len(int submode)
{
        return ulp2_extra_len[submode & 3];
}

#define CPL_RX_DDP_STATUS_DDP_SHIFT     16 /* ddp'able */
#define CPL_RX_DDP_STATUS_PAD_SHIFT     19 /* pad error */
#define CPL_RX_DDP_STATUS_HCRC_SHIFT    20 /* hcrc error */
#define CPL_RX_DDP_STATUS_DCRC_SHIFT    21 /* dcrc error */

/*
 * sge_opaque_hdr -
 * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
 * and for which we must reserve space.
 */
struct sge_opaque_hdr {
        void *dev;
        dma_addr_t addr[MAX_SKB_FRAGS + 1];
};

struct cxgbi_sock {
        struct cxgbi_device *cdev;

        int tid;
        int atid;
        unsigned long flags;
        unsigned int mtu;
        unsigned short rss_qid;
        unsigned short txq_idx;
        unsigned short advmss;
        unsigned int tx_chan;
        unsigned int rx_chan;
        unsigned int mss_idx;
        unsigned int smac_idx;
        unsigned char port_id;
        int wr_max_cred;
        int wr_cred;
        int wr_una_cred;
#ifdef CONFIG_CHELSIO_T4_DCB
        u8 dcb_priority;
#endif
        unsigned char hcrc_len;
        unsigned char dcrc_len;

        void *l2t;
        struct sk_buff *wr_pending_head;
        struct sk_buff *wr_pending_tail;
        struct sk_buff *cpl_close;
        struct sk_buff *cpl_abort_req;
        struct sk_buff *cpl_abort_rpl;
        struct sk_buff *skb_ulp_lhdr;
        spinlock_t lock;
        struct kref refcnt;
        unsigned int state;
        unsigned int csk_family;
        union {
                struct sockaddr_in saddr;
                struct sockaddr_in6 saddr6;
        };
        union {
                struct sockaddr_in daddr;
                struct sockaddr_in6 daddr6;
        };
        struct dst_entry *dst;
        struct sk_buff_head receive_queue;
        struct sk_buff_head write_queue;
        struct timer_list retry_timer;
        struct completion cmpl;
        int err;
        rwlock_t callback_lock;
        void *user_data;

        u32 rcv_nxt;
        u32 copied_seq;
        u32 rcv_wup;
        u32 snd_nxt;
        u32 snd_una;
        u32 write_seq;
        u32 snd_win;
        u32 rcv_win;

        bool disable_iso;
        u32 no_tx_credits;
        unsigned long prev_iso_ts;
};

/*
 * connection states
 */
enum cxgbi_sock_states{
        CTP_CLOSED,
        CTP_CONNECTING,
        CTP_ACTIVE_OPEN,
        CTP_ESTABLISHED,
        CTP_ACTIVE_CLOSE,
        CTP_PASSIVE_CLOSE,
        CTP_CLOSE_WAIT_1,
        CTP_CLOSE_WAIT_2,
        CTP_ABORTING,
};

/*
 * Connection flags -- many to track some close related events.
 */
enum cxgbi_sock_flags {
        CTPF_ABORT_RPL_RCVD,    /*received one ABORT_RPL_RSS message */
        CTPF_ABORT_REQ_RCVD,    /*received one ABORT_REQ_RSS message */
        CTPF_ABORT_RPL_PENDING, /* expecting an abort reply */
        CTPF_TX_DATA_SENT,      /* already sent a TX_DATA WR */
        CTPF_ACTIVE_CLOSE_NEEDED,/* need to be closed */
        CTPF_HAS_ATID,          /* reserved atid */
        CTPF_HAS_TID,           /* reserved hw tid */
        CTPF_OFFLOAD_DOWN,      /* offload function off */
        CTPF_LOGOUT_RSP_RCVD,   /* received logout response */
};

struct cxgbi_skb_rx_cb {
        __u32 ddigest;
        __u32 pdulen;
};

struct cxgbi_skb_tx_cb {
        void *handle;
        void *arp_err_handler;
        struct sk_buff *wr_next;
        u16 iscsi_hdr_len;
        u8 ulp_mode;
};

enum cxgbi_skcb_flags {
        SKCBF_TX_NEED_HDR,      /* packet needs a header */
        SKCBF_TX_MEM_WRITE,     /* memory write */
        SKCBF_TX_FLAG_COMPL,    /* wr completion flag */
        SKCBF_RX_COALESCED,     /* received whole pdu */
        SKCBF_RX_HDR,           /* received pdu header */
        SKCBF_RX_DATA,          /* received pdu payload */
        SKCBF_RX_STATUS,        /* received ddp status */
        SKCBF_RX_ISCSI_COMPL,   /* received iscsi completion */
        SKCBF_RX_DATA_DDPD,     /* pdu payload ddp'd */
        SKCBF_RX_HCRC_ERR,      /* header digest error */
        SKCBF_RX_DCRC_ERR,      /* data digest error */
        SKCBF_RX_PAD_ERR,       /* padding byte error */
        SKCBF_TX_ISO,           /* iso cpl in tx skb */
};

struct cxgbi_skb_cb {
        union {
                struct cxgbi_skb_rx_cb rx;
                struct cxgbi_skb_tx_cb tx;
        };
        unsigned long flags;
        unsigned int seq;
};

#define CXGBI_SKB_CB(skb)       ((struct cxgbi_skb_cb *)&((skb)->cb[0]))
#define cxgbi_skcb_flags(skb)           (CXGBI_SKB_CB(skb)->flags)
#define cxgbi_skcb_tcp_seq(skb)         (CXGBI_SKB_CB(skb)->seq)
#define cxgbi_skcb_rx_ddigest(skb)      (CXGBI_SKB_CB(skb)->rx.ddigest)
#define cxgbi_skcb_rx_pdulen(skb)       (CXGBI_SKB_CB(skb)->rx.pdulen)
#define cxgbi_skcb_tx_wr_next(skb)      (CXGBI_SKB_CB(skb)->tx.wr_next)
#define cxgbi_skcb_tx_iscsi_hdrlen(skb) (CXGBI_SKB_CB(skb)->tx.iscsi_hdr_len)
#define cxgbi_skcb_tx_ulp_mode(skb)     (CXGBI_SKB_CB(skb)->tx.ulp_mode)

static inline void cxgbi_skcb_set_flag(struct sk_buff *skb,
                                        enum cxgbi_skcb_flags flag)
{
        __set_bit(flag, &(cxgbi_skcb_flags(skb)));
}

static inline void cxgbi_skcb_clear_flag(struct sk_buff *skb,
                                        enum cxgbi_skcb_flags flag)
{
        __clear_bit(flag, &(cxgbi_skcb_flags(skb)));
}

static inline int cxgbi_skcb_test_flag(const struct sk_buff *skb,
                                       enum cxgbi_skcb_flags flag)
{
        return test_bit(flag, &(cxgbi_skcb_flags(skb)));
}

static inline void cxgbi_sock_set_flag(struct cxgbi_sock *csk,
                                        enum cxgbi_sock_flags flag)
{
        __set_bit(flag, &csk->flags);
        log_debug(1 << CXGBI_DBG_SOCK,
                "csk 0x%p,%u,0x%lx, bit %d.\n",
                csk, csk->state, csk->flags, flag);
}

static inline void cxgbi_sock_clear_flag(struct cxgbi_sock *csk,
                                        enum cxgbi_sock_flags flag)
{
        __clear_bit(flag, &csk->flags);
        log_debug(1 << CXGBI_DBG_SOCK,
                "csk 0x%p,%u,0x%lx, bit %d.\n",
                csk, csk->state, csk->flags, flag);
}

static inline int cxgbi_sock_flag(struct cxgbi_sock *csk,
                                enum cxgbi_sock_flags flag)
{
        if (csk == NULL)
                return 0;
        return test_bit(flag, &csk->flags);
}

static inline void cxgbi_sock_set_state(struct cxgbi_sock *csk, int state)
{
        log_debug(1 << CXGBI_DBG_SOCK,
                "csk 0x%p,%u,0x%lx, state -> %u.\n",
                csk, csk->state, csk->flags, state);
        csk->state = state;
}

static inline void cxgbi_sock_free(struct kref *kref)
{
        struct cxgbi_sock *csk = container_of(kref,
                                                struct cxgbi_sock,
                                                refcnt);
        if (csk) {
                log_debug(1 << CXGBI_DBG_SOCK,
                        "free csk 0x%p, state %u, flags 0x%lx\n",
                        csk, csk->state, csk->flags);
                kfree(csk);
        }
}

static inline void __cxgbi_sock_put(const char *fn, struct cxgbi_sock *csk)
{
        log_debug(1 << CXGBI_DBG_SOCK,
                "%s, put csk 0x%p, ref %u-1.\n",
                fn, csk, kref_read(&csk->refcnt));
        kref_put(&csk->refcnt, cxgbi_sock_free);
}
#define cxgbi_sock_put(csk)     __cxgbi_sock_put(__func__, csk)

static inline void __cxgbi_sock_get(const char *fn, struct cxgbi_sock *csk)
{
        log_debug(1 << CXGBI_DBG_SOCK,
                "%s, get csk 0x%p, ref %u+1.\n",
                fn, csk, kref_read(&csk->refcnt));
        kref_get(&csk->refcnt);
}
#define cxgbi_sock_get(csk)     __cxgbi_sock_get(__func__, csk)

static inline int cxgbi_sock_is_closing(struct cxgbi_sock *csk)
{
        return csk->state >= CTP_ACTIVE_CLOSE;
}

static inline int cxgbi_sock_is_established(struct cxgbi_sock *csk)
{
        return csk->state == CTP_ESTABLISHED;
}

static inline void cxgbi_sock_purge_write_queue(struct cxgbi_sock *csk)
{
        struct sk_buff *skb;

        while ((skb = __skb_dequeue(&csk->write_queue)))
                __kfree_skb(skb);
}

static inline unsigned int cxgbi_sock_compute_wscale(unsigned int win)
{
        unsigned int wscale = 0;

        while (wscale < 14 && (65535 << wscale) < win)
                wscale++;
        return wscale;
}

static inline struct sk_buff *alloc_wr(int wrlen, int dlen, gfp_t gfp)
{
        struct sk_buff *skb = alloc_skb(wrlen + dlen, gfp);

        if (skb) {
                __skb_put(skb, wrlen);
                memset(skb->head, 0, wrlen + dlen);
        } else
                pr_info("alloc cpl wr skb %u+%u, OOM.\n", wrlen, dlen);
        return skb;
}


/*
 * The number of WRs needed for an skb depends on the number of fragments
 * in the skb and whether it has any payload in its main body.  This maps the
 * length of the gather list represented by an skb into the # of necessary WRs.
 * The extra two fragments are for iscsi bhs and payload padding.
 */
#define SKB_WR_LIST_SIZE         (MAX_SKB_FRAGS + 2)

static inline void cxgbi_sock_reset_wr_list(struct cxgbi_sock *csk)
{
        csk->wr_pending_head = csk->wr_pending_tail = NULL;
}

static inline void cxgbi_sock_enqueue_wr(struct cxgbi_sock *csk,
                                          struct sk_buff *skb)
{
        cxgbi_skcb_tx_wr_next(skb) = NULL;
        /*
         * We want to take an extra reference since both us and the driver
         * need to free the packet before it's really freed.
         */
        skb_get(skb);

        if (!csk->wr_pending_head)
                csk->wr_pending_head = skb;
        else
                cxgbi_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
        csk->wr_pending_tail = skb;
}

static inline int cxgbi_sock_count_pending_wrs(const struct cxgbi_sock *csk)
{
        int n = 0;
        const struct sk_buff *skb = csk->wr_pending_head;

        while (skb) {
                n += skb->csum;
                skb = cxgbi_skcb_tx_wr_next(skb);
        }
        return n;
}

static inline struct sk_buff *cxgbi_sock_peek_wr(const struct cxgbi_sock *csk)
{
        return csk->wr_pending_head;
}

static inline struct sk_buff *cxgbi_sock_dequeue_wr(struct cxgbi_sock *csk)
{
        struct sk_buff *skb = csk->wr_pending_head;

        if (likely(skb)) {
                csk->wr_pending_head = cxgbi_skcb_tx_wr_next(skb);
                cxgbi_skcb_tx_wr_next(skb) = NULL;
        }
        return skb;
}

void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *);
void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *);
void cxgbi_sock_skb_entail(struct cxgbi_sock *, struct sk_buff *);
void cxgbi_sock_fail_act_open(struct cxgbi_sock *, int);
void cxgbi_sock_act_open_req_arp_failure(void *, struct sk_buff *);
void cxgbi_sock_closed(struct cxgbi_sock *);
void cxgbi_sock_established(struct cxgbi_sock *, unsigned int, unsigned int);
void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *);
void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *);
void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *, u32);
void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *, unsigned int, unsigned int,
                                int);
unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *, unsigned int);
void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *);

struct cxgbi_hba {
        struct net_device *ndev;
        struct net_device *vdev;        /* vlan dev */
        struct Scsi_Host *shost;
        struct cxgbi_device *cdev;
        __be32 ipv4addr;
        unsigned char port_id;
};

struct cxgbi_ports_map {
        unsigned int max_connect;
        unsigned int used;
        unsigned short sport_base;
        spinlock_t lock;
        unsigned int next;
        struct cxgbi_sock **port_csk;
};

#define CXGBI_FLAG_DEV_T3               0x1
#define CXGBI_FLAG_DEV_T4               0x2
#define CXGBI_FLAG_ADAPTER_RESET        0x4
#define CXGBI_FLAG_IPV4_SET             0x10
#define CXGBI_FLAG_USE_PPOD_OFLDQ       0x40
#define CXGBI_FLAG_DDP_OFF              0x100
#define CXGBI_FLAG_DEV_ISO_OFF          0x400

struct cxgbi_device {
        struct list_head list_head;
        struct list_head rcu_node;
        unsigned int flags;
        struct net_device **ports;
        void *lldev;
        struct cxgbi_hba **hbas;
        const unsigned short *mtus;
        unsigned char nmtus;
        unsigned char nports;
        struct pci_dev *pdev;
        struct iscsi_transport *itp;
        struct module *owner;

        unsigned int pfvf;
        unsigned int rx_credit_thres;
        unsigned int skb_tx_rsvd;
        u32 skb_iso_txhdr;
        unsigned int skb_rx_extra;      /* for msg coalesced mode */
        unsigned int tx_max_size;
        unsigned int rx_max_size;
        unsigned int rxq_idx_cntr;
        struct cxgbi_ports_map pmap;

        struct cxgbi_ppm* (*cdev2ppm)(struct cxgbi_device *);
        int (*csk_ddp_set_map)(struct cxgbi_ppm *, struct cxgbi_sock *,
                               struct cxgbi_task_tag_info *);
        void (*csk_ddp_clear_map)(struct cxgbi_device *cdev,
                                  struct cxgbi_ppm *,
                                  struct cxgbi_task_tag_info *);
        int (*csk_ddp_setup_digest)(struct cxgbi_sock *,
                                    unsigned int, int, int);
        int (*csk_ddp_setup_pgidx)(struct cxgbi_sock *,
                                   unsigned int, int);

        void (*csk_release_offload_resources)(struct cxgbi_sock *);
        u32 (*csk_send_rx_credits)(struct cxgbi_sock *, u32);
        int (*csk_push_tx_frames)(struct cxgbi_sock *, int);
        void (*csk_send_abort_req)(struct cxgbi_sock *);
        void (*csk_send_close_req)(struct cxgbi_sock *);
        int (*csk_alloc_cpls)(struct cxgbi_sock *);
        int (*csk_init_act_open)(struct cxgbi_sock *);

        void *dd_data;
};
#define cxgbi_cdev_priv(cdev)   ((cdev)->dd_data)

struct cxgbi_conn {
        struct cxgbi_endpoint *cep;
        struct iscsi_conn *iconn;
        struct cxgbi_hba *chba;
        u32 task_idx_bits;
        unsigned int ddp_full;
        unsigned int ddp_tag_full;
};

struct cxgbi_endpoint {
        struct cxgbi_conn *cconn;
        struct cxgbi_hba *chba;
        struct cxgbi_sock *csk;
};

struct cxgbi_task_data {
#define CXGBI_TASK_SGL_CHECKED  0x1
#define CXGBI_TASK_SGL_COPY     0x2
        u8 flags;
        unsigned short nr_frags;
        struct page_frag frags[MAX_SKB_FRAGS];
        struct sk_buff *skb;
        unsigned int dlen;
        unsigned int offset;
        unsigned int count;
        unsigned int sgoffset;
        u32 total_count;
        u32 total_offset;
        u32 max_xmit_dlength;
        struct cxgbi_task_tag_info ttinfo;
};
#define iscsi_task_cxgbi_data(task) \
        ((task)->dd_data + sizeof(struct iscsi_tcp_task))

struct cxgbi_iso_info {
#define CXGBI_ISO_INFO_FSLICE           0x1
#define CXGBI_ISO_INFO_LSLICE           0x2
#define CXGBI_ISO_INFO_IMM_ENABLE       0x4
        u8 flags;
        u8 op;
        u8 ahs;
        u8 num_pdu;
        u32 mpdu;
        u32 burst_size;
        u32 len;
        u32 segment_offset;
        u32 datasn_offset;
        u32 buffer_offset;
};

static inline void cxgbi_set_iscsi_ipv4(struct cxgbi_hba *chba, __be32 ipaddr)
{
        if (chba->cdev->flags & CXGBI_FLAG_IPV4_SET)
                chba->ipv4addr = ipaddr;
        else
                pr_info("set iscsi ipv4 NOT supported, using %s ipv4.\n",
                        chba->ndev->name);
}

struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
void cxgbi_device_unregister(struct cxgbi_device *);
void cxgbi_device_unregister_all(unsigned int flag);
struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *, int *);
struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *,
                                                     int *);
int cxgbi_hbas_add(struct cxgbi_device *, u64, unsigned int,
                        const struct scsi_host_template *,
                        struct scsi_transport_template *);
void cxgbi_hbas_remove(struct cxgbi_device *);

int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
                        unsigned int max_conn);
void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev);

void cxgbi_conn_tx_open(struct cxgbi_sock *);
void cxgbi_conn_pdu_ready(struct cxgbi_sock *);
int cxgbi_conn_alloc_pdu(struct iscsi_task *, u8);
int cxgbi_conn_init_pdu(struct iscsi_task *, unsigned int , unsigned int);
int cxgbi_conn_xmit_pdu(struct iscsi_task *);

void cxgbi_cleanup_task(struct iscsi_task *task);

umode_t cxgbi_attr_is_visible(int param_type, int param);
void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
int cxgbi_set_conn_param(struct iscsi_cls_conn *,
                        enum iscsi_param, char *, int);
int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param, char *);
struct iscsi_cls_conn *cxgbi_create_conn(struct iscsi_cls_session *, u32);
int cxgbi_bind_conn(struct iscsi_cls_session *,
                        struct iscsi_cls_conn *, u64, int);
void cxgbi_destroy_session(struct iscsi_cls_session *);
struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *,
                        u16, u16, u32);
int cxgbi_set_host_param(struct Scsi_Host *,
                        enum iscsi_host_param, char *, int);
int cxgbi_get_host_param(struct Scsi_Host *, enum iscsi_host_param, char *);
struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *,
                        struct sockaddr *, int);
int cxgbi_ep_poll(struct iscsi_endpoint *, int);
void cxgbi_ep_disconnect(struct iscsi_endpoint *);

int cxgbi_iscsi_init(struct iscsi_transport *,
                        struct scsi_transport_template **);
void cxgbi_iscsi_cleanup(struct iscsi_transport *,
                        struct scsi_transport_template **);
void cxgbi_parse_pdu_itt(struct iscsi_conn *, itt_t, int *, int *);
int cxgbi_ddp_init(struct cxgbi_device *, unsigned int, unsigned int,
                        unsigned int, unsigned int);
int cxgbi_ddp_cleanup(struct cxgbi_device *);
void cxgbi_ddp_page_size_factor(int *);
void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *,
                            struct cxgbi_task_tag_info *,
                            struct scatterlist **sg_pp, unsigned int *sg_off);
int cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
                        struct cxgbi_tag_format *tformat,
                        unsigned int iscsi_size, unsigned int llimit,
                        unsigned int start, unsigned int rsvd_factor,
                        unsigned int edram_start, unsigned int edram_size);
#endif  /*__LIBCXGBI_H__*/