/*
 * cxgb4i.c: Chelsio 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)
 *              Rakesh Ranjan (rranjan@chelsio.com)
 */

#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <scsi/scsi_host.h>
#include <net/tcp.h>
#include <net/dst.h>
#include <linux/netdevice.h>
#include <net/addrconf.h>

#include "t4_regs.h"
#include "t4_msg.h"
#include "cxgb4.h"
#include "cxgb4_uld.h"
#include "t4fw_api.h"
#include "l2t.h"
#include "cxgb4i.h"
#include "clip_tbl.h"

static unsigned int dbg_level;

#include "../libcxgbi.h"

#ifdef CONFIG_CHELSIO_T4_DCB
#include <net/dcbevent.h>
#include "cxgb4_dcb.h"
#endif

#define DRV_MODULE_NAME         "cxgb4i"
#define DRV_MODULE_DESC         "Chelsio T4-T6 iSCSI Driver"
#define DRV_MODULE_VERSION      "0.9.5-ko"
#define DRV_MODULE_RELDATE      "Apr. 2015"

static char version[] =
        DRV_MODULE_DESC " " DRV_MODULE_NAME
        " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";

MODULE_AUTHOR("Chelsio Communications, Inc.");
MODULE_DESCRIPTION(DRV_MODULE_DESC);
MODULE_VERSION(DRV_MODULE_VERSION);
MODULE_LICENSE("GPL");

module_param(dbg_level, uint, 0644);
MODULE_PARM_DESC(dbg_level, "Debug flag (default=0)");

#define CXGB4I_DEFAULT_10G_RCV_WIN (256 * 1024)
static int cxgb4i_rcv_win = -1;
module_param(cxgb4i_rcv_win, int, 0644);
MODULE_PARM_DESC(cxgb4i_rcv_win, "TCP receive window in bytes");

#define CXGB4I_DEFAULT_10G_SND_WIN (128 * 1024)
static int cxgb4i_snd_win = -1;
module_param(cxgb4i_snd_win, int, 0644);
MODULE_PARM_DESC(cxgb4i_snd_win, "TCP send window in bytes");

static int cxgb4i_rx_credit_thres = 10 * 1024;
module_param(cxgb4i_rx_credit_thres, int, 0644);
MODULE_PARM_DESC(cxgb4i_rx_credit_thres,
                "RX credits return threshold in bytes (default=10KB)");

static unsigned int cxgb4i_max_connect = (8 * 1024);
module_param(cxgb4i_max_connect, uint, 0644);
MODULE_PARM_DESC(cxgb4i_max_connect, "Maximum number of connections");

static unsigned short cxgb4i_sport_base = 20000;
module_param(cxgb4i_sport_base, ushort, 0644);
MODULE_PARM_DESC(cxgb4i_sport_base, "Starting port number (default 20000)");

typedef void (*cxgb4i_cplhandler_func)(struct cxgbi_device *, struct sk_buff *);

static void *t4_uld_add(const struct cxgb4_lld_info *);
static int t4_uld_rx_handler(void *, const __be64 *, const struct pkt_gl *);
static int t4_uld_state_change(void *, enum cxgb4_state state);
static inline int send_tx_flowc_wr(struct cxgbi_sock *);

static const struct cxgb4_uld_info cxgb4i_uld_info = {
        .name = DRV_MODULE_NAME,
        .nrxq = MAX_ULD_QSETS,
        .ntxq = MAX_ULD_QSETS,
        .rxq_size = 1024,
        .lro = false,
        .add = t4_uld_add,
        .rx_handler = t4_uld_rx_handler,
        .state_change = t4_uld_state_change,
};

static struct scsi_host_template cxgb4i_host_template = {
        .module         = THIS_MODULE,
        .name           = DRV_MODULE_NAME,
        .proc_name      = DRV_MODULE_NAME,
        .can_queue      = CXGB4I_SCSI_HOST_QDEPTH,
        .queuecommand   = iscsi_queuecommand,
        .change_queue_depth = scsi_change_queue_depth,
        .sg_tablesize   = SG_ALL,
        .max_sectors    = 0xFFFF,
        .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
        .eh_timed_out   = iscsi_eh_cmd_timed_out,
        .eh_abort_handler = iscsi_eh_abort,
        .eh_device_reset_handler = iscsi_eh_device_reset,
        .eh_target_reset_handler = iscsi_eh_recover_target,
        .target_alloc   = iscsi_target_alloc,
        .dma_boundary   = PAGE_SIZE - 1,
        .this_id        = -1,
        .track_queue_depth = 1,
};

static struct iscsi_transport cxgb4i_iscsi_transport = {
        .owner          = THIS_MODULE,
        .name           = DRV_MODULE_NAME,
        .caps           = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
                                CAP_DATADGST | CAP_DIGEST_OFFLOAD |
                                CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
        .attr_is_visible        = cxgbi_attr_is_visible,
        .get_host_param = cxgbi_get_host_param,
        .set_host_param = cxgbi_set_host_param,
        /* session management */
        .create_session = cxgbi_create_session,
        .destroy_session        = cxgbi_destroy_session,
        .get_session_param = iscsi_session_get_param,
        /* connection management */
        .create_conn    = cxgbi_create_conn,
        .bind_conn              = cxgbi_bind_conn,
        .destroy_conn   = iscsi_tcp_conn_teardown,
        .start_conn             = iscsi_conn_start,
        .stop_conn              = iscsi_conn_stop,
        .get_conn_param = iscsi_conn_get_param,
        .set_param      = cxgbi_set_conn_param,
        .get_stats      = cxgbi_get_conn_stats,
        /* pdu xmit req from user space */
        .send_pdu       = iscsi_conn_send_pdu,
        /* task */
        .init_task      = iscsi_tcp_task_init,
        .xmit_task      = iscsi_tcp_task_xmit,
        .cleanup_task   = cxgbi_cleanup_task,
        /* pdu */
        .alloc_pdu      = cxgbi_conn_alloc_pdu,
        .init_pdu       = cxgbi_conn_init_pdu,
        .xmit_pdu       = cxgbi_conn_xmit_pdu,
        .parse_pdu_itt  = cxgbi_parse_pdu_itt,
        /* TCP connect/disconnect */
        .get_ep_param   = cxgbi_get_ep_param,
        .ep_connect     = cxgbi_ep_connect,
        .ep_poll        = cxgbi_ep_poll,
        .ep_disconnect  = cxgbi_ep_disconnect,
        /* Error recovery timeout call */
        .session_recovery_timedout = iscsi_session_recovery_timedout,
};

#ifdef CONFIG_CHELSIO_T4_DCB
static int
cxgb4_dcb_change_notify(struct notifier_block *, unsigned long, void *);

static struct notifier_block cxgb4_dcb_change = {
        .notifier_call = cxgb4_dcb_change_notify,
};
#endif

static struct scsi_transport_template *cxgb4i_stt;

/*
 * CPL (Chelsio Protocol Language) defines a message passing interface between
 * the host driver and Chelsio asic.
 * The section below implments CPLs that related to iscsi tcp connection
 * open/close/abort and data send/receive.
 */

#define RCV_BUFSIZ_MASK         0x3FFU
#define MAX_IMM_TX_PKT_LEN      256

static int push_tx_frames(struct cxgbi_sock *, int);

/*
 * is_ofld_imm - check whether a packet can be sent as immediate data
 * @skb: the packet
 *
 * Returns true if a packet can be sent as an offload WR with immediate
 * data.  We currently use the same limit as for Ethernet packets.
 */
static inline bool is_ofld_imm(const struct sk_buff *skb)
{
        int len = skb->len;

        if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR)))
                len += sizeof(struct fw_ofld_tx_data_wr);

        return len <= MAX_IMM_TX_PKT_LEN;
}

static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
                                struct l2t_entry *e)
{
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
        int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
        unsigned long long opt0;
        unsigned int opt2;
        unsigned int qid_atid = ((unsigned int)csk->atid) |
                                 (((unsigned int)csk->rss_qid) << 14);

        opt0 = KEEP_ALIVE_F |
                WND_SCALE_V(wscale) |
                MSS_IDX_V(csk->mss_idx) |
                L2T_IDX_V(((struct l2t_entry *)csk->l2t)->idx) |
                TX_CHAN_V(csk->tx_chan) |
                SMAC_SEL_V(csk->smac_idx) |
                ULP_MODE_V(ULP_MODE_ISCSI) |
                RCV_BUFSIZ_V(csk->rcv_win >> 10);

        opt2 = RX_CHANNEL_V(0) |
                RSS_QUEUE_VALID_F |
                RSS_QUEUE_V(csk->rss_qid);

        if (is_t4(lldi->adapter_type)) {
                struct cpl_act_open_req *req =
                                (struct cpl_act_open_req *)skb->head;

                INIT_TP_WR(req, 0);
                OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
                                        qid_atid));
                req->local_port = csk->saddr.sin_port;
                req->peer_port = csk->daddr.sin_port;
                req->local_ip = csk->saddr.sin_addr.s_addr;
                req->peer_ip = csk->daddr.sin_addr.s_addr;
                req->opt0 = cpu_to_be64(opt0);
                req->params = cpu_to_be32(cxgb4_select_ntuple(
                                        csk->cdev->ports[csk->port_id],
                                        csk->l2t));
                opt2 |= RX_FC_VALID_F;
                req->opt2 = cpu_to_be32(opt2);

                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                        "csk t4 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
                        csk, &req->local_ip, ntohs(req->local_port),
                        &req->peer_ip, ntohs(req->peer_port),
                        csk->atid, csk->rss_qid);
        } else if (is_t5(lldi->adapter_type)) {
                struct cpl_t5_act_open_req *req =
                                (struct cpl_t5_act_open_req *)skb->head;
                u32 isn = (prandom_u32() & ~7UL) - 1;

                INIT_TP_WR(req, 0);
                OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
                                        qid_atid));
                req->local_port = csk->saddr.sin_port;
                req->peer_port = csk->daddr.sin_port;
                req->local_ip = csk->saddr.sin_addr.s_addr;
                req->peer_ip = csk->daddr.sin_addr.s_addr;
                req->opt0 = cpu_to_be64(opt0);
                req->params = cpu_to_be64(FILTER_TUPLE_V(
                                cxgb4_select_ntuple(
                                        csk->cdev->ports[csk->port_id],
                                        csk->l2t)));
                req->rsvd = cpu_to_be32(isn);
                opt2 |= T5_ISS_VALID;
                opt2 |= T5_OPT_2_VALID_F;

                req->opt2 = cpu_to_be32(opt2);

                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                        "csk t5 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
                        csk, &req->local_ip, ntohs(req->local_port),
                        &req->peer_ip, ntohs(req->peer_port),
                        csk->atid, csk->rss_qid);
        } else {
                struct cpl_t6_act_open_req *req =
                                (struct cpl_t6_act_open_req *)skb->head;
                u32 isn = (prandom_u32() & ~7UL) - 1;

                INIT_TP_WR(req, 0);
                OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
                                                            qid_atid));
                req->local_port = csk->saddr.sin_port;
                req->peer_port = csk->daddr.sin_port;
                req->local_ip = csk->saddr.sin_addr.s_addr;
                req->peer_ip = csk->daddr.sin_addr.s_addr;
                req->opt0 = cpu_to_be64(opt0);
                req->params = cpu_to_be64(FILTER_TUPLE_V(
                                cxgb4_select_ntuple(
                                        csk->cdev->ports[csk->port_id],
                                        csk->l2t)));
                req->rsvd = cpu_to_be32(isn);

                opt2 |= T5_ISS_VALID;
                opt2 |= RX_FC_DISABLE_F;
                opt2 |= T5_OPT_2_VALID_F;

                req->opt2 = cpu_to_be32(opt2);
                req->rsvd2 = cpu_to_be32(0);
                req->opt3 = cpu_to_be32(0);

                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                          "csk t6 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
                          csk, &req->local_ip, ntohs(req->local_port),
                          &req->peer_ip, ntohs(req->peer_port),
                          csk->atid, csk->rss_qid);
        }

        set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);

        pr_info_ipaddr("t%d csk 0x%p,%u,0x%lx,%u, rss_qid %u.\n",
                       (&csk->saddr), (&csk->daddr),
                       CHELSIO_CHIP_VERSION(lldi->adapter_type), csk,
                       csk->state, csk->flags, csk->atid, csk->rss_qid);

        cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
}

#if IS_ENABLED(CONFIG_IPV6)
static void send_act_open_req6(struct cxgbi_sock *csk, struct sk_buff *skb,
                               struct l2t_entry *e)
{
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
        int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
        unsigned long long opt0;
        unsigned int opt2;
        unsigned int qid_atid = ((unsigned int)csk->atid) |
                                 (((unsigned int)csk->rss_qid) << 14);

        opt0 = KEEP_ALIVE_F |
                WND_SCALE_V(wscale) |
                MSS_IDX_V(csk->mss_idx) |
                L2T_IDX_V(((struct l2t_entry *)csk->l2t)->idx) |
                TX_CHAN_V(csk->tx_chan) |
                SMAC_SEL_V(csk->smac_idx) |
                ULP_MODE_V(ULP_MODE_ISCSI) |
                RCV_BUFSIZ_V(csk->rcv_win >> 10);

        opt2 = RX_CHANNEL_V(0) |
                RSS_QUEUE_VALID_F |
                RSS_QUEUE_V(csk->rss_qid);

        if (is_t4(lldi->adapter_type)) {
                struct cpl_act_open_req6 *req =
                            (struct cpl_act_open_req6 *)skb->head;

                INIT_TP_WR(req, 0);
                OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
                                                            qid_atid));
                req->local_port = csk->saddr6.sin6_port;
                req->peer_port = csk->daddr6.sin6_port;

                req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
                req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
                                                                    8);
                req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
                req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
                                                                    8);

                req->opt0 = cpu_to_be64(opt0);

                opt2 |= RX_FC_VALID_F;
                req->opt2 = cpu_to_be32(opt2);

                req->params = cpu_to_be32(cxgb4_select_ntuple(
                                          csk->cdev->ports[csk->port_id],
                                          csk->l2t));
        } else if (is_t5(lldi->adapter_type)) {
                struct cpl_t5_act_open_req6 *req =
                                (struct cpl_t5_act_open_req6 *)skb->head;

                INIT_TP_WR(req, 0);
                OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
                                                            qid_atid));
                req->local_port = csk->saddr6.sin6_port;
                req->peer_port = csk->daddr6.sin6_port;
                req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
                req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
                                                                        8);
                req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
                req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
                                                                        8);
                req->opt0 = cpu_to_be64(opt0);

                opt2 |= T5_OPT_2_VALID_F;
                req->opt2 = cpu_to_be32(opt2);

                req->params = cpu_to_be64(FILTER_TUPLE_V(cxgb4_select_ntuple(
                                          csk->cdev->ports[csk->port_id],
                                          csk->l2t)));
        } else {
                struct cpl_t6_act_open_req6 *req =
                                (struct cpl_t6_act_open_req6 *)skb->head;

                INIT_TP_WR(req, 0);
                OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
                                                            qid_atid));
                req->local_port = csk->saddr6.sin6_port;
                req->peer_port = csk->daddr6.sin6_port;
                req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
                req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
                                                                        8);
                req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
                req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
                                                                        8);
                req->opt0 = cpu_to_be64(opt0);

                opt2 |= RX_FC_DISABLE_F;
                opt2 |= T5_OPT_2_VALID_F;

                req->opt2 = cpu_to_be32(opt2);

                req->params = cpu_to_be64(FILTER_TUPLE_V(cxgb4_select_ntuple(
                                          csk->cdev->ports[csk->port_id],
                                          csk->l2t)));

                req->rsvd2 = cpu_to_be32(0);
                req->opt3 = cpu_to_be32(0);
        }

        set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);

        pr_info("t%d csk 0x%p,%u,0x%lx,%u, [%pI6]:%u-[%pI6]:%u, rss_qid %u.\n",
                CHELSIO_CHIP_VERSION(lldi->adapter_type), csk, csk->state,
                csk->flags, csk->atid,
                &csk->saddr6.sin6_addr, ntohs(csk->saddr.sin_port),
                &csk->daddr6.sin6_addr, ntohs(csk->daddr.sin_port),
                csk->rss_qid);

        cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
}
#endif

static void send_close_req(struct cxgbi_sock *csk)
{
        struct sk_buff *skb = csk->cpl_close;
        struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
        unsigned int tid = csk->tid;

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p,%u,0x%lx, tid %u.\n",
                csk, csk->state, csk->flags, csk->tid);
        csk->cpl_close = NULL;
        set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
        INIT_TP_WR(req, tid);
        OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
        req->rsvd = 0;

        cxgbi_sock_skb_entail(csk, skb);
        if (csk->state >= CTP_ESTABLISHED)
                push_tx_frames(csk, 1);
}

static void abort_arp_failure(void *handle, struct sk_buff *skb)
{
        struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
        struct cpl_abort_req *req;

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p,%u,0x%lx, tid %u, abort.\n",
                csk, csk->state, csk->flags, csk->tid);
        req = (struct cpl_abort_req *)skb->data;
        req->cmd = CPL_ABORT_NO_RST;
        cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
}

static void send_abort_req(struct cxgbi_sock *csk)
{
        struct cpl_abort_req *req;
        struct sk_buff *skb = csk->cpl_abort_req;

        if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
                return;

        if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
                send_tx_flowc_wr(csk);
                cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
        }

        cxgbi_sock_set_state(csk, CTP_ABORTING);
        cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
        cxgbi_sock_purge_write_queue(csk);

        csk->cpl_abort_req = NULL;
        req = (struct cpl_abort_req *)skb->head;
        set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
        req->cmd = CPL_ABORT_SEND_RST;
        t4_set_arp_err_handler(skb, csk, abort_arp_failure);
        INIT_TP_WR(req, csk->tid);
        OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
        req->rsvd0 = htonl(csk->snd_nxt);
        req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
                csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
                req->rsvd1);

        cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
}

static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
{
        struct sk_buff *skb = csk->cpl_abort_rpl;
        struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p,%u,0x%lx,%u, status %d.\n",
                csk, csk->state, csk->flags, csk->tid, rst_status);

        csk->cpl_abort_rpl = NULL;
        set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
        INIT_TP_WR(rpl, csk->tid);
        OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
        rpl->cmd = rst_status;
        cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
}

/*
 * CPL connection rx data ack: host ->
 * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 * credits sent.
 */
static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
{
        struct sk_buff *skb;
        struct cpl_rx_data_ack *req;

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
                "csk 0x%p,%u,0x%lx,%u, credit %u.\n",
                csk, csk->state, csk->flags, csk->tid, credits);

        skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
        if (!skb) {
                pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
                return 0;
        }
        req = (struct cpl_rx_data_ack *)skb->head;

        set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
        INIT_TP_WR(req, csk->tid);
        OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
                                      csk->tid));
        req->credit_dack = cpu_to_be32(RX_CREDITS_V(credits)
                                       | RX_FORCE_ACK_F);
        cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
        return credits;
}

/*
 * sgl_len - calculates the size of an SGL of the given capacity
 * @n: the number of SGL entries
 * Calculates the number of flits needed for a scatter/gather list that
 * can hold the given number of entries.
 */
static inline unsigned int sgl_len(unsigned int n)
{
        n--;
        return (3 * n) / 2 + (n & 1) + 2;
}

/*
 * calc_tx_flits_ofld - calculate # of flits for an offload packet
 * @skb: the packet
 *
 * Returns the number of flits needed for the given offload packet.
 * These packets are already fully constructed and no additional headers
 * will be added.
 */
static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
{
        unsigned int flits, cnt;

        if (is_ofld_imm(skb))
                return DIV_ROUND_UP(skb->len, 8);
        flits = skb_transport_offset(skb) / 8;
        cnt = skb_shinfo(skb)->nr_frags;
        if (skb_tail_pointer(skb) != skb_transport_header(skb))
                cnt++;
        return flits + sgl_len(cnt);
}

#define FLOWC_WR_NPARAMS_MIN    9
static inline int tx_flowc_wr_credits(int *nparamsp, int *flowclenp)
{
        int nparams, flowclen16, flowclen;

        nparams = FLOWC_WR_NPARAMS_MIN;
#ifdef CONFIG_CHELSIO_T4_DCB
        nparams++;
#endif
        flowclen = offsetof(struct fw_flowc_wr, mnemval[nparams]);
        flowclen16 = DIV_ROUND_UP(flowclen, 16);
        flowclen = flowclen16 * 16;
        /*
         * Return the number of 16-byte credits used by the FlowC request.
         * Pass back the nparams and actual FlowC length if requested.
         */
        if (nparamsp)
                *nparamsp = nparams;
        if (flowclenp)
                *flowclenp = flowclen;

        return flowclen16;
}

static inline int send_tx_flowc_wr(struct cxgbi_sock *csk)
{
        struct sk_buff *skb;
        struct fw_flowc_wr *flowc;
        int nparams, flowclen16, flowclen;

#ifdef CONFIG_CHELSIO_T4_DCB
        u16 vlan = ((struct l2t_entry *)csk->l2t)->vlan;
#endif
        flowclen16 = tx_flowc_wr_credits(&nparams, &flowclen);
        skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
        flowc = (struct fw_flowc_wr *)skb->head;
        flowc->op_to_nparams =
                htonl(FW_WR_OP_V(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS_V(nparams));
        flowc->flowid_len16 =
                htonl(FW_WR_LEN16_V(flowclen16) | FW_WR_FLOWID_V(csk->tid));
        flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
        flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
        flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
        flowc->mnemval[1].val = htonl(csk->tx_chan);
        flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
        flowc->mnemval[2].val = htonl(csk->tx_chan);
        flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
        flowc->mnemval[3].val = htonl(csk->rss_qid);
        flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
        flowc->mnemval[4].val = htonl(csk->snd_nxt);
        flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
        flowc->mnemval[5].val = htonl(csk->rcv_nxt);
        flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
        flowc->mnemval[6].val = htonl(csk->snd_win);
        flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
        flowc->mnemval[7].val = htonl(csk->advmss);
        flowc->mnemval[8].mnemonic = 0;
        flowc->mnemval[8].val = 0;
        flowc->mnemval[8].mnemonic = FW_FLOWC_MNEM_TXDATAPLEN_MAX;
        flowc->mnemval[8].val = 16384;
#ifdef CONFIG_CHELSIO_T4_DCB
        flowc->mnemval[9].mnemonic = FW_FLOWC_MNEM_DCBPRIO;
        if (vlan == CPL_L2T_VLAN_NONE) {
                pr_warn_ratelimited("csk %u without VLAN Tag on DCB Link\n",
                                    csk->tid);
                flowc->mnemval[9].val = cpu_to_be32(0);
        } else {
                flowc->mnemval[9].val = cpu_to_be32((vlan & VLAN_PRIO_MASK) >>
                                        VLAN_PRIO_SHIFT);
        }
#endif

        set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
                csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
                csk->snd_nxt, csk->rcv_nxt, csk->snd_win,
                csk->advmss);

        cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);

        return flowclen16;
}

static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
                                   int dlen, int len, u32 credits, int compl)
{
        struct fw_ofld_tx_data_wr *req;
        unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
        unsigned int wr_ulp_mode = 0, val;
        bool imm = is_ofld_imm(skb);

        req = __skb_push(skb, sizeof(*req));

        if (imm) {
                req->op_to_immdlen = htonl(FW_WR_OP_V(FW_OFLD_TX_DATA_WR) |
                                        FW_WR_COMPL_F |
                                        FW_WR_IMMDLEN_V(dlen));
                req->flowid_len16 = htonl(FW_WR_FLOWID_V(csk->tid) |
                                                FW_WR_LEN16_V(credits));
        } else {
                req->op_to_immdlen =
                        cpu_to_be32(FW_WR_OP_V(FW_OFLD_TX_DATA_WR) |
                                        FW_WR_COMPL_F |
                                        FW_WR_IMMDLEN_V(0));
                req->flowid_len16 =
                        cpu_to_be32(FW_WR_FLOWID_V(csk->tid) |
                                        FW_WR_LEN16_V(credits));
        }
        if (submode)
                wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE_V(ULP2_MODE_ISCSI) |
                                FW_OFLD_TX_DATA_WR_ULPSUBMODE_V(submode);
        val = skb_peek(&csk->write_queue) ? 0 : 1;
        req->tunnel_to_proxy = htonl(wr_ulp_mode |
                                     FW_OFLD_TX_DATA_WR_SHOVE_V(val));
        req->plen = htonl(len);
        if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
                cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
}

static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
{
        kfree_skb(skb);
}

static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
{
        int total_size = 0;
        struct sk_buff *skb;

        if (unlikely(csk->state < CTP_ESTABLISHED ||
                csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
                         1 << CXGBI_DBG_PDU_TX,
                        "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
                        csk, csk->state, csk->flags, csk->tid);
                return 0;
        }

        while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
                int dlen = skb->len;
                int len = skb->len;
                unsigned int credits_needed;
                int flowclen16 = 0;

                skb_reset_transport_header(skb);
                if (is_ofld_imm(skb))
                        credits_needed = DIV_ROUND_UP(dlen, 16);
                else
                        credits_needed = DIV_ROUND_UP(
                                                8 * calc_tx_flits_ofld(skb),
                                                16);

                if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR)))
                        credits_needed += DIV_ROUND_UP(
                                        sizeof(struct fw_ofld_tx_data_wr),
                                        16);

                /*
                 * Assumes the initial credits is large enough to support
                 * fw_flowc_wr plus largest possible first payload
                 */
                if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
                        flowclen16 = send_tx_flowc_wr(csk);
                        csk->wr_cred -= flowclen16;
                        csk->wr_una_cred += flowclen16;
                        cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
                }

                if (csk->wr_cred < credits_needed) {
                        log_debug(1 << CXGBI_DBG_PDU_TX,
                                "csk 0x%p, skb %u/%u, wr %d < %u.\n",
                                csk, skb->len, skb->data_len,
                                credits_needed, csk->wr_cred);
                        break;
                }
                __skb_unlink(skb, &csk->write_queue);
                set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
                skb->csum = credits_needed + flowclen16;
                csk->wr_cred -= credits_needed;
                csk->wr_una_cred += credits_needed;
                cxgbi_sock_enqueue_wr(csk, skb);

                log_debug(1 << CXGBI_DBG_PDU_TX,
                        "csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
                        csk, skb->len, skb->data_len, credits_needed,
                        csk->wr_cred, csk->wr_una_cred);

                if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
                        len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
                        make_tx_data_wr(csk, skb, dlen, len, credits_needed,
                                        req_completion);
                        csk->snd_nxt += len;
                        cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
                } else if (cxgbi_skcb_test_flag(skb, SKCBF_TX_FLAG_COMPL) &&
                           (csk->wr_una_cred >= (csk->wr_max_cred / 2))) {
                        struct cpl_close_con_req *req =
                                (struct cpl_close_con_req *)skb->data;
                        req->wr.wr_hi |= htonl(FW_WR_COMPL_F);
                }
                total_size += skb->truesize;
                t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);

                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
                        "csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
                        csk, csk->state, csk->flags, csk->tid, skb, len);

                cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
        }
        return total_size;
}

static inline void free_atid(struct cxgbi_sock *csk)
{
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);

        if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
                cxgb4_free_atid(lldi->tids, csk->atid);
                cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
                cxgbi_sock_put(csk);
        }
}

static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
        unsigned short tcp_opt = ntohs(req->tcp_opt);
        unsigned int tid = GET_TID(req);
        unsigned int atid = TID_TID_G(ntohl(req->tos_atid));
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;
        u32 rcv_isn = be32_to_cpu(req->rcv_isn);

        csk = lookup_atid(t, atid);
        if (unlikely(!csk)) {
                pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
                goto rel_skb;
        }

        if (csk->atid != atid) {
                pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
                        atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
                goto rel_skb;
        }

        pr_info_ipaddr("atid 0x%x, tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
                       (&csk->saddr), (&csk->daddr),
                       atid, tid, csk, csk->state, csk->flags, rcv_isn);

        module_put(cdev->owner);

        cxgbi_sock_get(csk);
        csk->tid = tid;
        cxgb4_insert_tid(lldi->tids, csk, tid, csk->csk_family);
        cxgbi_sock_set_flag(csk, CTPF_HAS_TID);

        free_atid(csk);

        spin_lock_bh(&csk->lock);
        if (unlikely(csk->state != CTP_ACTIVE_OPEN))
                pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
                        csk, csk->state, csk->flags, csk->tid);

        if (csk->retry_timer.function) {
                del_timer(&csk->retry_timer);
                csk->retry_timer.function = NULL;
        }

        csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
        /*
         * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
         * pass through opt0.
         */
        if (csk->rcv_win > (RCV_BUFSIZ_MASK << 10))
                csk->rcv_wup -= csk->rcv_win - (RCV_BUFSIZ_MASK << 10);

        csk->advmss = lldi->mtus[TCPOPT_MSS_G(tcp_opt)] - 40;
        if (TCPOPT_TSTAMP_G(tcp_opt))
                csk->advmss -= 12;
        if (csk->advmss < 128)
                csk->advmss = 128;

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p, mss_idx %u, advmss %u.\n",
                        csk, TCPOPT_MSS_G(tcp_opt), csk->advmss);

        cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));

        if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
                send_abort_req(csk);
        else {
                if (skb_queue_len(&csk->write_queue))
                        push_tx_frames(csk, 0);
                cxgbi_conn_tx_open(csk);
        }
        spin_unlock_bh(&csk->lock);

rel_skb:
        __kfree_skb(skb);
}

static int act_open_rpl_status_to_errno(int status)
{
        switch (status) {
        case CPL_ERR_CONN_RESET:
                return -ECONNREFUSED;
        case CPL_ERR_ARP_MISS:
                return -EHOSTUNREACH;
        case CPL_ERR_CONN_TIMEDOUT:
                return -ETIMEDOUT;
        case CPL_ERR_TCAM_FULL:
                return -ENOMEM;
        case CPL_ERR_CONN_EXIST:
                return -EADDRINUSE;
        default:
                return -EIO;
        }
}

static void csk_act_open_retry_timer(struct timer_list *t)
{
        struct sk_buff *skb = NULL;
        struct cxgbi_sock *csk = from_timer(csk, t, retry_timer);
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
        void (*send_act_open_func)(struct cxgbi_sock *, struct sk_buff *,
                                   struct l2t_entry *);
        int t4 = is_t4(lldi->adapter_type), size, size6;

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p,%u,0x%lx,%u.\n",
                csk, csk->state, csk->flags, csk->tid);

        cxgbi_sock_get(csk);
        spin_lock_bh(&csk->lock);

        if (t4) {
                size = sizeof(struct cpl_act_open_req);
                size6 = sizeof(struct cpl_act_open_req6);
        } else {
                size = sizeof(struct cpl_t5_act_open_req);
                size6 = sizeof(struct cpl_t5_act_open_req6);
        }

        if (csk->csk_family == AF_INET) {
                send_act_open_func = send_act_open_req;
                skb = alloc_wr(size, 0, GFP_ATOMIC);
#if IS_ENABLED(CONFIG_IPV6)
        } else {
                send_act_open_func = send_act_open_req6;
                skb = alloc_wr(size6, 0, GFP_ATOMIC);
#endif
        }

        if (!skb)
                cxgbi_sock_fail_act_open(csk, -ENOMEM);
        else {
                skb->sk = (struct sock *)csk;
                t4_set_arp_err_handler(skb, csk,
                                       cxgbi_sock_act_open_req_arp_failure);
                send_act_open_func(csk, skb, csk->l2t);
        }

        spin_unlock_bh(&csk->lock);
        cxgbi_sock_put(csk);

}

static inline bool is_neg_adv(unsigned int status)
{
        return status == CPL_ERR_RTX_NEG_ADVICE ||
                status == CPL_ERR_KEEPALV_NEG_ADVICE ||
                status == CPL_ERR_PERSIST_NEG_ADVICE;
}

static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
        unsigned int tid = GET_TID(rpl);
        unsigned int atid =
                TID_TID_G(AOPEN_ATID_G(be32_to_cpu(rpl->atid_status)));
        unsigned int status = AOPEN_STATUS_G(be32_to_cpu(rpl->atid_status));
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;

        csk = lookup_atid(t, atid);
        if (unlikely(!csk)) {
                pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
                goto rel_skb;
        }

        pr_info_ipaddr("tid %u/%u, status %u.\n"
                       "csk 0x%p,%u,0x%lx. ", (&csk->saddr), (&csk->daddr),
                       atid, tid, status, csk, csk->state, csk->flags);

        if (is_neg_adv(status))
                goto rel_skb;

        module_put(cdev->owner);

        if (status && status != CPL_ERR_TCAM_FULL &&
            status != CPL_ERR_CONN_EXIST &&
            status != CPL_ERR_ARP_MISS)
                cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl),
                                 csk->csk_family);

        cxgbi_sock_get(csk);
        spin_lock_bh(&csk->lock);

        if (status == CPL_ERR_CONN_EXIST &&
            csk->retry_timer.function != csk_act_open_retry_timer) {
                csk->retry_timer.function = csk_act_open_retry_timer;
                mod_timer(&csk->retry_timer, jiffies + HZ / 2);
        } else

                cxgbi_sock_fail_act_open(csk,
                                        act_open_rpl_status_to_errno(status));

        spin_unlock_bh(&csk->lock);
        cxgbi_sock_put(csk);
rel_skb:
        __kfree_skb(skb);
}

static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
        unsigned int tid = GET_TID(req);
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;

        csk = lookup_tid(t, tid);
        if (unlikely(!csk)) {
                pr_err("can't find connection for tid %u.\n", tid);
                goto rel_skb;
        }
        pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
                       (&csk->saddr), (&csk->daddr),
                       csk, csk->state, csk->flags, csk->tid);
        cxgbi_sock_rcv_peer_close(csk);
rel_skb:
        __kfree_skb(skb);
}

static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
        unsigned int tid = GET_TID(rpl);
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;

        csk = lookup_tid(t, tid);
        if (unlikely(!csk)) {
                pr_err("can't find connection for tid %u.\n", tid);
                goto rel_skb;
        }
        pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
                       (&csk->saddr), (&csk->daddr),
                       csk, csk->state, csk->flags, csk->tid);
        cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
rel_skb:
        __kfree_skb(skb);
}

static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
                                                                int *need_rst)
{
        switch (abort_reason) {
        case CPL_ERR_BAD_SYN: /* fall through */
        case CPL_ERR_CONN_RESET:
                return csk->state > CTP_ESTABLISHED ?
                        -EPIPE : -ECONNRESET;
        case CPL_ERR_XMIT_TIMEDOUT:
        case CPL_ERR_PERSIST_TIMEDOUT:
        case CPL_ERR_FINWAIT2_TIMEDOUT:
        case CPL_ERR_KEEPALIVE_TIMEDOUT:
                return -ETIMEDOUT;
        default:
                return -EIO;
        }
}

static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
        unsigned int tid = GET_TID(req);
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;
        int rst_status = CPL_ABORT_NO_RST;

        csk = lookup_tid(t, tid);
        if (unlikely(!csk)) {
                pr_err("can't find connection for tid %u.\n", tid);
                goto rel_skb;
        }

        pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
                       (&csk->saddr), (&csk->daddr),
                       csk, csk->state, csk->flags, csk->tid, req->status);

        if (is_neg_adv(req->status))
                goto rel_skb;

        cxgbi_sock_get(csk);
        spin_lock_bh(&csk->lock);

        cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);

        if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
                send_tx_flowc_wr(csk);
                cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
        }

        cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
        cxgbi_sock_set_state(csk, CTP_ABORTING);

        send_abort_rpl(csk, rst_status);

        if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
                csk->err = abort_status_to_errno(csk, req->status, &rst_status);
                cxgbi_sock_closed(csk);
        }

        spin_unlock_bh(&csk->lock);
        cxgbi_sock_put(csk);
rel_skb:
        __kfree_skb(skb);
}

static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
        unsigned int tid = GET_TID(rpl);
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;

        csk = lookup_tid(t, tid);
        if (!csk)
                goto rel_skb;

        if (csk)
                pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
                               (&csk->saddr), (&csk->daddr), csk,
                               csk->state, csk->flags, csk->tid, rpl->status);

        if (rpl->status == CPL_ERR_ABORT_FAILED)
                goto rel_skb;

        cxgbi_sock_rcv_abort_rpl(csk);
rel_skb:
        __kfree_skb(skb);
}

static void do_rx_data(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct cpl_rx_data *cpl = (struct cpl_rx_data *)skb->data;
        unsigned int tid = GET_TID(cpl);
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;

        csk = lookup_tid(t, tid);
        if (!csk) {
                pr_err("can't find connection for tid %u.\n", tid);
        } else {
                /* not expecting this, reset the connection. */
                pr_err("csk 0x%p, tid %u, rcv cpl_rx_data.\n", csk, tid);
                spin_lock_bh(&csk->lock);
                send_abort_req(csk);
                spin_unlock_bh(&csk->lock);
        }
        __kfree_skb(skb);
}

static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
        unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
        unsigned int tid = GET_TID(cpl);
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;

        csk = lookup_tid(t, tid);
        if (unlikely(!csk)) {
                pr_err("can't find conn. for tid %u.\n", tid);
                goto rel_skb;
        }

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
                "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
                csk, csk->state, csk->flags, csk->tid, skb, skb->len,
                pdu_len_ddp);

        spin_lock_bh(&csk->lock);

        if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                        "csk 0x%p,%u,0x%lx,%u, bad state.\n",
                        csk, csk->state, csk->flags, csk->tid);
                if (csk->state != CTP_ABORTING)
                        goto abort_conn;
                else
                        goto discard;
        }

        cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
        cxgbi_skcb_flags(skb) = 0;

        skb_reset_transport_header(skb);
        __skb_pull(skb, sizeof(*cpl));
        __pskb_trim(skb, ntohs(cpl->len));

        if (!csk->skb_ulp_lhdr) {
                unsigned char *bhs;
                unsigned int hlen, dlen, plen;

                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
                        "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
                        csk, csk->state, csk->flags, csk->tid, skb);
                csk->skb_ulp_lhdr = skb;
                cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);

                if ((CHELSIO_CHIP_VERSION(lldi->adapter_type) <= CHELSIO_T5) &&
                    (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt)) {
                        pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
                                csk->tid, cxgbi_skcb_tcp_seq(skb),
                                csk->rcv_nxt);
                        goto abort_conn;
                }

                bhs = skb->data;
                hlen = ntohs(cpl->len);
                dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;

                plen = ISCSI_PDU_LEN_G(pdu_len_ddp);
                if (is_t4(lldi->adapter_type))
                        plen -= 40;

                if ((hlen + dlen) != plen) {
                        pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
                                "mismatch %u != %u + %u, seq 0x%x.\n",
                                csk->tid, plen, hlen, dlen,
                                cxgbi_skcb_tcp_seq(skb));
                        goto abort_conn;
                }

                cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
                if (dlen)
                        cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
                csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);

                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
                        "csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
                        csk, skb, *bhs, hlen, dlen,
                        ntohl(*((unsigned int *)(bhs + 16))),
                        ntohl(*((unsigned int *)(bhs + 24))));

        } else {
                struct sk_buff *lskb = csk->skb_ulp_lhdr;

                cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
                        "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
                        csk, csk->state, csk->flags, skb, lskb);
        }

        __skb_queue_tail(&csk->receive_queue, skb);
        spin_unlock_bh(&csk->lock);
        return;

abort_conn:
        send_abort_req(csk);
discard:
        spin_unlock_bh(&csk->lock);
rel_skb:
        __kfree_skb(skb);
}

static void do_rx_iscsi_data(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;
        struct sk_buff *lskb;
        u32 tid = GET_TID(cpl);
        u16 pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);

        csk = lookup_tid(t, tid);
        if (unlikely(!csk)) {
                pr_err("can't find conn. for tid %u.\n", tid);
                goto rel_skb;
        }

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
                  "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
                  csk, csk->state, csk->flags, csk->tid, skb,
                  skb->len, pdu_len_ddp);

        spin_lock_bh(&csk->lock);

        if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                          "csk 0x%p,%u,0x%lx,%u, bad state.\n",
                          csk, csk->state, csk->flags, csk->tid);

                if (csk->state != CTP_ABORTING)
                        goto abort_conn;
                else
                        goto discard;
        }

        cxgbi_skcb_tcp_seq(skb) = be32_to_cpu(cpl->seq);
        cxgbi_skcb_flags(skb) = 0;

        skb_reset_transport_header(skb);
        __skb_pull(skb, sizeof(*cpl));
        __pskb_trim(skb, ntohs(cpl->len));

        if (!csk->skb_ulp_lhdr)
                csk->skb_ulp_lhdr = skb;

        lskb = csk->skb_ulp_lhdr;
        cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
                  "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
                  csk, csk->state, csk->flags, skb, lskb);

        __skb_queue_tail(&csk->receive_queue, skb);
        spin_unlock_bh(&csk->lock);
        return;

abort_conn:
        send_abort_req(csk);
discard:
        spin_unlock_bh(&csk->lock);
rel_skb:
        __kfree_skb(skb);
}

static void
cxgb4i_process_ddpvld(struct cxgbi_sock *csk,
                      struct sk_buff *skb, u32 ddpvld)
{
        if (ddpvld & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
                pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
                        csk, skb, ddpvld, cxgbi_skcb_flags(skb));
                cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
        }

        if (ddpvld & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
                pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
                        csk, skb, ddpvld, cxgbi_skcb_flags(skb));
                cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
        }

        if (ddpvld & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
                log_debug(1 << CXGBI_DBG_PDU_RX,
                          "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
                          csk, skb, ddpvld);
                cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
        }

        if ((ddpvld & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
            !cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
                log_debug(1 << CXGBI_DBG_PDU_RX,
                          "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
                          csk, skb, ddpvld);
                cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
        }
}

static void do_rx_data_ddp(struct cxgbi_device *cdev,
                                  struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct sk_buff *lskb;
        struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
        unsigned int tid = GET_TID(rpl);
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;
        u32 ddpvld = be32_to_cpu(rpl->ddpvld);

        csk = lookup_tid(t, tid);
        if (unlikely(!csk)) {
                pr_err("can't find connection for tid %u.\n", tid);
                goto rel_skb;
        }

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
                "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
                csk, csk->state, csk->flags, skb, ddpvld, csk->skb_ulp_lhdr);

        spin_lock_bh(&csk->lock);

        if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                        "csk 0x%p,%u,0x%lx,%u, bad state.\n",
                        csk, csk->state, csk->flags, csk->tid);
                if (csk->state != CTP_ABORTING)
                        goto abort_conn;
                else
                        goto discard;
        }

        if (!csk->skb_ulp_lhdr) {
                pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
                goto abort_conn;
        }

        lskb = csk->skb_ulp_lhdr;
        csk->skb_ulp_lhdr = NULL;

        cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);

        if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
                pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
                        csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));

        cxgb4i_process_ddpvld(csk, lskb, ddpvld);

        log_debug(1 << CXGBI_DBG_PDU_RX,
                "csk 0x%p, lskb 0x%p, f 0x%lx.\n",
                csk, lskb, cxgbi_skcb_flags(lskb));

        cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
        cxgbi_conn_pdu_ready(csk);
        spin_unlock_bh(&csk->lock);
        goto rel_skb;

abort_conn:
        send_abort_req(csk);
discard:
        spin_unlock_bh(&csk->lock);
rel_skb:
        __kfree_skb(skb);
}

static void
do_rx_iscsi_cmp(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct cpl_rx_iscsi_cmp *rpl = (struct cpl_rx_iscsi_cmp *)skb->data;
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;
        struct sk_buff *data_skb = NULL;
        u32 tid = GET_TID(rpl);
        u32 ddpvld = be32_to_cpu(rpl->ddpvld);
        u32 seq = be32_to_cpu(rpl->seq);
        u16 pdu_len_ddp = be16_to_cpu(rpl->pdu_len_ddp);

        csk = lookup_tid(t, tid);
        if (unlikely(!csk)) {
                pr_err("can't find connection for tid %u.\n", tid);
                goto rel_skb;
        }

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
                  "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p, len %u, "
                  "pdu_len_ddp %u, status %u.\n",
                  csk, csk->state, csk->flags, skb, ddpvld, csk->skb_ulp_lhdr,
                  ntohs(rpl->len), pdu_len_ddp,  rpl->status);

        spin_lock_bh(&csk->lock);

        if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                          "csk 0x%p,%u,0x%lx,%u, bad state.\n",
                          csk, csk->state, csk->flags, csk->tid);

                if (csk->state != CTP_ABORTING)
                        goto abort_conn;
                else
                        goto discard;
        }

        cxgbi_skcb_tcp_seq(skb) = seq;
        cxgbi_skcb_flags(skb) = 0;
        cxgbi_skcb_rx_pdulen(skb) = 0;

        skb_reset_transport_header(skb);
        __skb_pull(skb, sizeof(*rpl));
        __pskb_trim(skb, be16_to_cpu(rpl->len));

        csk->rcv_nxt = seq + pdu_len_ddp;

        if (csk->skb_ulp_lhdr) {
                data_skb = skb_peek(&csk->receive_queue);
                if (!data_skb ||
                    !cxgbi_skcb_test_flag(data_skb, SKCBF_RX_DATA)) {
                        pr_err("Error! freelist data not found 0x%p, tid %u\n",
                               data_skb, tid);

                        goto abort_conn;
                }
                __skb_unlink(data_skb, &csk->receive_queue);

                cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA);

                __skb_queue_tail(&csk->receive_queue, skb);
                __skb_queue_tail(&csk->receive_queue, data_skb);
        } else {
                 __skb_queue_tail(&csk->receive_queue, skb);
        }

        csk->skb_ulp_lhdr = NULL;

        cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
        cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
        cxgbi_skcb_set_flag(skb, SKCBF_RX_ISCSI_COMPL);
        cxgbi_skcb_rx_ddigest(skb) = be32_to_cpu(rpl->ulp_crc);

        cxgb4i_process_ddpvld(csk, skb, ddpvld);

        log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, skb 0x%p, f 0x%lx.\n",
                  csk, skb, cxgbi_skcb_flags(skb));

        cxgbi_conn_pdu_ready(csk);
        spin_unlock_bh(&csk->lock);

        return;

abort_conn:
        send_abort_req(csk);
discard:
        spin_unlock_bh(&csk->lock);
rel_skb:
        __kfree_skb(skb);
}

static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cxgbi_sock *csk;
        struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
        unsigned int tid = GET_TID(rpl);
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;

        csk = lookup_tid(t, tid);
        if (unlikely(!csk))
                pr_err("can't find connection for tid %u.\n", tid);
        else {
                log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                        "csk 0x%p,%u,0x%lx,%u.\n",
                        csk, csk->state, csk->flags, csk->tid);
                cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
                                        rpl->seq_vld);
        }
        __kfree_skb(skb);
}

static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
{
        struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
        unsigned int tid = GET_TID(rpl);
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct tid_info *t = lldi->tids;
        struct cxgbi_sock *csk;

        csk = lookup_tid(t, tid);
        if (!csk) {
                pr_err("can't find conn. for tid %u.\n", tid);
                return;
        }

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p,%u,%lx,%u, status 0x%x.\n",
                csk, csk->state, csk->flags, csk->tid, rpl->status);

        if (rpl->status != CPL_ERR_NONE) {
                pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
                        csk, tid, rpl->status);
                csk->err = -EINVAL;
        }

        complete(&csk->cmpl);

        __kfree_skb(skb);
}

static int alloc_cpls(struct cxgbi_sock *csk)
{
        csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
                                        0, GFP_KERNEL);
        if (!csk->cpl_close)
                return -ENOMEM;

        csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
                                        0, GFP_KERNEL);
        if (!csk->cpl_abort_req)
                goto free_cpls;

        csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
                                        0, GFP_KERNEL);
        if (!csk->cpl_abort_rpl)
                goto free_cpls;
        return 0;

free_cpls:
        cxgbi_sock_free_cpl_skbs(csk);
        return -ENOMEM;
}

static inline void l2t_put(struct cxgbi_sock *csk)
{
        if (csk->l2t) {
                cxgb4_l2t_release(csk->l2t);
                csk->l2t = NULL;
                cxgbi_sock_put(csk);
        }
}

static void release_offload_resources(struct cxgbi_sock *csk)
{
        struct cxgb4_lld_info *lldi;
#if IS_ENABLED(CONFIG_IPV6)
        struct net_device *ndev = csk->cdev->ports[csk->port_id];
#endif

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p,%u,0x%lx,%u.\n",
                csk, csk->state, csk->flags, csk->tid);

        cxgbi_sock_free_cpl_skbs(csk);
        cxgbi_sock_purge_write_queue(csk);
        if (csk->wr_cred != csk->wr_max_cred) {
                cxgbi_sock_purge_wr_queue(csk);
                cxgbi_sock_reset_wr_list(csk);
        }

        l2t_put(csk);
#if IS_ENABLED(CONFIG_IPV6)
        if (csk->csk_family == AF_INET6)
                cxgb4_clip_release(ndev,
                                   (const u32 *)&csk->saddr6.sin6_addr, 1);
#endif

        if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
                free_atid(csk);
        else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
                lldi = cxgbi_cdev_priv(csk->cdev);
                cxgb4_remove_tid(lldi->tids, 0, csk->tid,
                                 csk->csk_family);
                cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
                cxgbi_sock_put(csk);
        }
        csk->dst = NULL;
}

#ifdef CONFIG_CHELSIO_T4_DCB
static inline u8 get_iscsi_dcb_state(struct net_device *ndev)
{
        return ndev->dcbnl_ops->getstate(ndev);
}

static int select_priority(int pri_mask)
{
        if (!pri_mask)
                return 0;
        return (ffs(pri_mask) - 1);
}

static u8 get_iscsi_dcb_priority(struct net_device *ndev)
{
        int rv;
        u8 caps;

        struct dcb_app iscsi_dcb_app = {
                .protocol = 3260
        };

        rv = (int)ndev->dcbnl_ops->getcap(ndev, DCB_CAP_ATTR_DCBX, &caps);
        if (rv)
                return 0;

        if (caps & DCB_CAP_DCBX_VER_IEEE) {
                iscsi_dcb_app.selector = IEEE_8021QAZ_APP_SEL_STREAM;
                rv = dcb_ieee_getapp_mask(ndev, &iscsi_dcb_app);
                if (!rv) {
                        iscsi_dcb_app.selector = IEEE_8021QAZ_APP_SEL_ANY;
                        rv = dcb_ieee_getapp_mask(ndev, &iscsi_dcb_app);
                }
        } else if (caps & DCB_CAP_DCBX_VER_CEE) {
                iscsi_dcb_app.selector = DCB_APP_IDTYPE_PORTNUM;
                rv = dcb_getapp(ndev, &iscsi_dcb_app);
        }

        log_debug(1 << CXGBI_DBG_ISCSI,
                  "iSCSI priority is set to %u\n", select_priority(rv));
        return select_priority(rv);
}
#endif

static int init_act_open(struct cxgbi_sock *csk)
{
        struct cxgbi_device *cdev = csk->cdev;
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct net_device *ndev = cdev->ports[csk->port_id];
        struct sk_buff *skb = NULL;
        struct neighbour *n = NULL;
        void *daddr;
        unsigned int step;
        unsigned int rxq_idx;
        unsigned int size, size6;
        unsigned int linkspeed;
        unsigned int rcv_winf, snd_winf;
#ifdef CONFIG_CHELSIO_T4_DCB
        u8 priority = 0;
#endif
        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p,%u,0x%lx,%u.\n",
                csk, csk->state, csk->flags, csk->tid);

        if (csk->csk_family == AF_INET)
                daddr = &csk->daddr.sin_addr.s_addr;
#if IS_ENABLED(CONFIG_IPV6)
        else if (csk->csk_family == AF_INET6)
                daddr = &csk->daddr6.sin6_addr;
#endif
        else {
                pr_err("address family 0x%x not supported\n", csk->csk_family);
                goto rel_resource;
        }

        n = dst_neigh_lookup(csk->dst, daddr);

        if (!n) {
                pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
                goto rel_resource;
        }

        if (!(n->nud_state & NUD_VALID))
                neigh_event_send(n, NULL);

        csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
        if (csk->atid < 0) {
                pr_err("%s, NO atid available.\n", ndev->name);
                goto rel_resource_without_clip;
        }
        cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
        cxgbi_sock_get(csk);

#ifdef CONFIG_CHELSIO_T4_DCB
        if (get_iscsi_dcb_state(ndev))
                priority = get_iscsi_dcb_priority(ndev);

        csk->dcb_priority = priority;
        csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, priority);
#else
        csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
#endif
        if (!csk->l2t) {
                pr_err("%s, cannot alloc l2t.\n", ndev->name);
                goto rel_resource_without_clip;
        }
        cxgbi_sock_get(csk);

#if IS_ENABLED(CONFIG_IPV6)
        if (csk->csk_family == AF_INET6)
                cxgb4_clip_get(ndev, (const u32 *)&csk->saddr6.sin6_addr, 1);
#endif

        if (is_t4(lldi->adapter_type)) {
                size = sizeof(struct cpl_act_open_req);
                size6 = sizeof(struct cpl_act_open_req6);
        } else if (is_t5(lldi->adapter_type)) {
                size = sizeof(struct cpl_t5_act_open_req);
                size6 = sizeof(struct cpl_t5_act_open_req6);
        } else {
                size = sizeof(struct cpl_t6_act_open_req);
                size6 = sizeof(struct cpl_t6_act_open_req6);
        }

        if (csk->csk_family == AF_INET)
                skb = alloc_wr(size, 0, GFP_NOIO);
#if IS_ENABLED(CONFIG_IPV6)
        else
                skb = alloc_wr(size6, 0, GFP_NOIO);
#endif

        if (!skb)
                goto rel_resource;
        skb->sk = (struct sock *)csk;
        t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);

        if (!csk->mtu)
                csk->mtu = dst_mtu(csk->dst);
        cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
        csk->tx_chan = cxgb4_port_chan(ndev);
        csk->smac_idx = ((struct port_info *)netdev_priv(ndev))->smt_idx;
        step = lldi->ntxq / lldi->nchan;
        csk->txq_idx = cxgb4_port_idx(ndev) * step;
        step = lldi->nrxq / lldi->nchan;
        rxq_idx = (cxgb4_port_idx(ndev) * step) + (cdev->rxq_idx_cntr % step);
        cdev->rxq_idx_cntr++;
        csk->rss_qid = lldi->rxq_ids[rxq_idx];
        linkspeed = ((struct port_info *)netdev_priv(ndev))->link_cfg.speed;
        csk->snd_win = cxgb4i_snd_win;
        csk->rcv_win = cxgb4i_rcv_win;
        if (cxgb4i_rcv_win <= 0) {
                csk->rcv_win = CXGB4I_DEFAULT_10G_RCV_WIN;
                rcv_winf = linkspeed / SPEED_10000;
                if (rcv_winf)
                        csk->rcv_win *= rcv_winf;
        }
        if (cxgb4i_snd_win <= 0) {
                csk->snd_win = CXGB4I_DEFAULT_10G_SND_WIN;
                snd_winf = linkspeed / SPEED_10000;
                if (snd_winf)
                        csk->snd_win *= snd_winf;
        }
        csk->wr_cred = lldi->wr_cred -
                       DIV_ROUND_UP(sizeof(struct cpl_abort_req), 16);
        csk->wr_max_cred = csk->wr_cred;
        csk->wr_una_cred = 0;
        cxgbi_sock_reset_wr_list(csk);
        csk->err = 0;

        pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u,%u,%u, mtu %u,%u, smac %u.\n",
                       (&csk->saddr), (&csk->daddr), csk, csk->state,
                       csk->flags, csk->tx_chan, csk->txq_idx, csk->rss_qid,
                       csk->mtu, csk->mss_idx, csk->smac_idx);

        /* must wait for either a act_open_rpl or act_open_establish */
        if (!try_module_get(cdev->owner)) {
                pr_err("%s, try_module_get failed.\n", ndev->name);
                goto rel_resource;
        }

        cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
        if (csk->csk_family == AF_INET)
                send_act_open_req(csk, skb, csk->l2t);
#if IS_ENABLED(CONFIG_IPV6)
        else
                send_act_open_req6(csk, skb, csk->l2t);
#endif
        neigh_release(n);

        return 0;

rel_resource:
#if IS_ENABLED(CONFIG_IPV6)
        if (csk->csk_family == AF_INET6)
                cxgb4_clip_release(ndev,
                                   (const u32 *)&csk->saddr6.sin6_addr, 1);
#endif
rel_resource_without_clip:
        if (n)
                neigh_release(n);
        if (skb)
                __kfree_skb(skb);
        return -EINVAL;
}

static cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
        [CPL_ACT_ESTABLISH] = do_act_establish,
        [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
        [CPL_PEER_CLOSE] = do_peer_close,
        [CPL_ABORT_REQ_RSS] = do_abort_req_rss,
        [CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
        [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
        [CPL_FW4_ACK] = do_fw4_ack,
        [CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
        [CPL_ISCSI_DATA] = do_rx_iscsi_data,
        [CPL_SET_TCB_RPL] = do_set_tcb_rpl,
        [CPL_RX_DATA_DDP] = do_rx_data_ddp,
        [CPL_RX_ISCSI_DDP] = do_rx_data_ddp,
        [CPL_RX_ISCSI_CMP] = do_rx_iscsi_cmp,
        [CPL_RX_DATA] = do_rx_data,
};

static int cxgb4i_ofld_init(struct cxgbi_device *cdev)
{
        int rc;

        if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
                cxgb4i_max_connect = CXGB4I_MAX_CONN;

        rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
                                        cxgb4i_max_connect);
        if (rc < 0)
                return rc;

        cdev->csk_release_offload_resources = release_offload_resources;
        cdev->csk_push_tx_frames = push_tx_frames;
        cdev->csk_send_abort_req = send_abort_req;
        cdev->csk_send_close_req = send_close_req;
        cdev->csk_send_rx_credits = send_rx_credits;
        cdev->csk_alloc_cpls = alloc_cpls;
        cdev->csk_init_act_open = init_act_open;

        pr_info("cdev 0x%p, offload up, added.\n", cdev);
        return 0;
}

static inline void
ulp_mem_io_set_hdr(struct cxgbi_device *cdev,
                   struct ulp_mem_io *req,
                   unsigned int wr_len, unsigned int dlen,
                   unsigned int pm_addr,
                   int tid)
{
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);

        INIT_ULPTX_WR(req, wr_len, 0, tid);
        req->wr.wr_hi = htonl(FW_WR_OP_V(FW_ULPTX_WR) |
                FW_WR_ATOMIC_V(0));
        req->cmd = htonl(ULPTX_CMD_V(ULP_TX_MEM_WRITE) |
                ULP_MEMIO_ORDER_V(is_t4(lldi->adapter_type)) |
                T5_ULP_MEMIO_IMM_V(!is_t4(lldi->adapter_type)));
        req->dlen = htonl(ULP_MEMIO_DATA_LEN_V(dlen >> 5));
        req->lock_addr = htonl(ULP_MEMIO_ADDR_V(pm_addr >> 5));
        req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));

        idata->cmd_more = htonl(ULPTX_CMD_V(ULP_TX_SC_IMM));
        idata->len = htonl(dlen);
}

static struct sk_buff *
ddp_ppod_init_idata(struct cxgbi_device *cdev,
                    struct cxgbi_ppm *ppm,
                    unsigned int idx, unsigned int npods,
                    unsigned int tid)
{
        unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ppm->llimit;
        unsigned int dlen = npods << PPOD_SIZE_SHIFT;
        unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
                                sizeof(struct ulptx_idata) + dlen, 16);
        struct sk_buff *skb = alloc_wr(wr_len, 0, GFP_ATOMIC);

        if (!skb) {
                pr_err("%s: %s idx %u, npods %u, OOM.\n",
                       __func__, ppm->ndev->name, idx, npods);
                return NULL;
        }

        ulp_mem_io_set_hdr(cdev, (struct ulp_mem_io *)skb->head, wr_len, dlen,
                           pm_addr, tid);

        return skb;
}

static int ddp_ppod_write_idata(struct cxgbi_ppm *ppm, struct cxgbi_sock *csk,
                                struct cxgbi_task_tag_info *ttinfo,
                                unsigned int idx, unsigned int npods,
                                struct scatterlist **sg_pp,
                                unsigned int *sg_off)
{
        struct cxgbi_device *cdev = csk->cdev;
        struct sk_buff *skb = ddp_ppod_init_idata(cdev, ppm, idx, npods,
                                                  csk->tid);
        struct ulp_mem_io *req;
        struct ulptx_idata *idata;
        struct cxgbi_pagepod *ppod;
        int i;

        if (!skb)
                return -ENOMEM;

        req = (struct ulp_mem_io *)skb->head;
        idata = (struct ulptx_idata *)(req + 1);
        ppod = (struct cxgbi_pagepod *)(idata + 1);

        for (i = 0; i < npods; i++, ppod++)
                cxgbi_ddp_set_one_ppod(ppod, ttinfo, sg_pp, sg_off);

        cxgbi_skcb_set_flag(skb, SKCBF_TX_MEM_WRITE);
        cxgbi_skcb_set_flag(skb, SKCBF_TX_FLAG_COMPL);
        set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);

        spin_lock_bh(&csk->lock);
        cxgbi_sock_skb_entail(csk, skb);
        spin_unlock_bh(&csk->lock);

        return 0;
}

static int ddp_set_map(struct cxgbi_ppm *ppm, struct cxgbi_sock *csk,
                       struct cxgbi_task_tag_info *ttinfo)
{
        unsigned int pidx = ttinfo->idx;
        unsigned int npods = ttinfo->npods;
        unsigned int i, cnt;
        int err = 0;
        struct scatterlist *sg = ttinfo->sgl;
        unsigned int offset = 0;

        ttinfo->cid = csk->port_id;

        for (i = 0; i < npods; i += cnt, pidx += cnt) {
                cnt = npods - i;

                if (cnt > ULPMEM_IDATA_MAX_NPPODS)
                        cnt = ULPMEM_IDATA_MAX_NPPODS;
                err = ddp_ppod_write_idata(ppm, csk, ttinfo, pidx, cnt,
                                           &sg, &offset);
                if (err < 0)
                        break;
        }

        return err;
}

static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
                                int pg_idx)
{
        struct sk_buff *skb;
        struct cpl_set_tcb_field *req;

        if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
                return 0;

        skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
        if (!skb)
                return -ENOMEM;

        /*  set up ulp page size */
        req = (struct cpl_set_tcb_field *)skb->head;
        INIT_TP_WR(req, csk->tid);
        OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
        req->reply_ctrl = htons(NO_REPLY_V(0) | QUEUENO_V(csk->rss_qid));
        req->word_cookie = htons(0);
        req->mask = cpu_to_be64(0x3 << 8);
        req->val = cpu_to_be64(pg_idx << 8);
        set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);

        reinit_completion(&csk->cmpl);
        cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
        wait_for_completion(&csk->cmpl);

        return csk->err;
}

static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
                                 int hcrc, int dcrc)
{
        struct sk_buff *skb;
        struct cpl_set_tcb_field *req;

        if (!hcrc && !dcrc)
                return 0;

        skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
        if (!skb)
                return -ENOMEM;

        csk->hcrc_len = (hcrc ? 4 : 0);
        csk->dcrc_len = (dcrc ? 4 : 0);
        /*  set up ulp submode */
        req = (struct cpl_set_tcb_field *)skb->head;
        INIT_TP_WR(req, tid);
        OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
        req->reply_ctrl = htons(NO_REPLY_V(0) | QUEUENO_V(csk->rss_qid));
        req->word_cookie = htons(0);
        req->mask = cpu_to_be64(0x3 << 4);
        req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
                                (dcrc ? ULP_CRC_DATA : 0)) << 4);
        set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);

        log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
                "csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);

        reinit_completion(&csk->cmpl);
        cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
        wait_for_completion(&csk->cmpl);

        return csk->err;
}

static struct cxgbi_ppm *cdev2ppm(struct cxgbi_device *cdev)
{
        return (struct cxgbi_ppm *)(*((struct cxgb4_lld_info *)
                                       (cxgbi_cdev_priv(cdev)))->iscsi_ppm);
}

static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
{
        struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
        struct net_device *ndev = cdev->ports[0];
        struct cxgbi_tag_format tformat;
        unsigned int ppmax;
        int i, err;

        if (!lldi->vr->iscsi.size) {
                pr_warn("%s, iscsi NOT enabled, check config!\n", ndev->name);
                return -EACCES;
        }

        cdev->flags |= CXGBI_FLAG_USE_PPOD_OFLDQ;
        ppmax = lldi->vr->iscsi.size >> PPOD_SIZE_SHIFT;

        memset(&tformat, 0, sizeof(struct cxgbi_tag_format));
        for (i = 0; i < 4; i++)
                tformat.pgsz_order[i] = (lldi->iscsi_pgsz_order >> (i << 3))
                                         & 0xF;
        cxgbi_tagmask_check(lldi->iscsi_tagmask, &tformat);

        pr_info("iscsi_edram.start 0x%x iscsi_edram.size 0x%x",
                lldi->vr->ppod_edram.start, lldi->vr->ppod_edram.size);

        err = cxgbi_ddp_ppm_setup(lldi->iscsi_ppm, cdev, &tformat,
                                  lldi->vr->iscsi.size, lldi->iscsi_llimit,
                                  lldi->vr->iscsi.start, 2,
                                  lldi->vr->ppod_edram.start,
                                  lldi->vr->ppod_edram.size);

        if (err < 0)
                return err;

        cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
        cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
        cdev->csk_ddp_set_map = ddp_set_map;
        cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
                                  lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN);
        cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
                                  lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN);
        cdev->cdev2ppm = cdev2ppm;

        return 0;
}

static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
{
        struct cxgbi_device *cdev;
        struct port_info *pi;
        int i, rc;

        cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
        if (!cdev) {
                pr_info("t4 device 0x%p, register failed.\n", lldi);
                return NULL;
        }
        pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
                cdev, lldi->adapter_type, lldi->nports,
                lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
                lldi->nrxq, lldi->wr_cred);
        for (i = 0; i < lldi->nrxq; i++)
                log_debug(1 << CXGBI_DBG_DEV,
                        "t4 0x%p, rxq id #%d: %u.\n",
                        cdev, i, lldi->rxq_ids[i]);

        memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
        cdev->flags = CXGBI_FLAG_DEV_T4;
        cdev->pdev = lldi->pdev;
        cdev->ports = lldi->ports;
        cdev->nports = lldi->nports;
        cdev->mtus = lldi->mtus;
        cdev->nmtus = NMTUS;
        cdev->rx_credit_thres = (CHELSIO_CHIP_VERSION(lldi->adapter_type) <=
                                 CHELSIO_T5) ? cxgb4i_rx_credit_thres : 0;
        cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
        cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
        cdev->itp = &cxgb4i_iscsi_transport;
        cdev->owner = THIS_MODULE;

        cdev->pfvf = FW_PFVF_CMD_PFN_V(lldi->pf);
        pr_info("cdev 0x%p,%s, pfvf %u.\n",
                cdev, lldi->ports[0]->name, cdev->pfvf);

        rc = cxgb4i_ddp_init(cdev);
        if (rc) {
                pr_info("t4 0x%p ddp init failed %d.\n", cdev, rc);
                goto err_out;
        }
        rc = cxgb4i_ofld_init(cdev);
        if (rc) {
                pr_info("t4 0x%p ofld init failed.\n", cdev);
                goto err_out;
        }

        rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
                                &cxgb4i_host_template, cxgb4i_stt);
        if (rc)
                goto err_out;

        for (i = 0; i < cdev->nports; i++) {
                pi = netdev_priv(lldi->ports[i]);
                cdev->hbas[i]->port_id = pi->port_id;
        }
        return cdev;

err_out:
        cxgbi_device_unregister(cdev);
        return ERR_PTR(-ENOMEM);
}

#define RX_PULL_LEN     128
static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
                                const struct pkt_gl *pgl)
{
        const struct cpl_act_establish *rpl;
        struct sk_buff *skb;
        unsigned int opc;
        struct cxgbi_device *cdev = handle;

        if (pgl == NULL) {
                unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;

                skb = alloc_wr(len, 0, GFP_ATOMIC);
                if (!skb)
                        goto nomem;
                skb_copy_to_linear_data(skb, &rsp[1], len);
        } else {
                if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
                        pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
                                pgl->va, be64_to_cpu(*rsp),
                                be64_to_cpu(*(u64 *)pgl->va),
                                pgl->tot_len);
                        return 0;
                }
                skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
                if (unlikely(!skb))
                        goto nomem;
        }

        rpl = (struct cpl_act_establish *)skb->data;
        opc = rpl->ot.opcode;
        log_debug(1 << CXGBI_DBG_TOE,
                "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
                 cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
        if (opc >= ARRAY_SIZE(cxgb4i_cplhandlers) || !cxgb4i_cplhandlers[opc]) {
                pr_err("No handler for opcode 0x%x.\n", opc);
                __kfree_skb(skb);
        } else
                cxgb4i_cplhandlers[opc](cdev, skb);

        return 0;
nomem:
        log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
        return 1;
}

static int t4_uld_state_change(void *handle, enum cxgb4_state state)
{
        struct cxgbi_device *cdev = handle;

        switch (state) {
        case CXGB4_STATE_UP:
                pr_info("cdev 0x%p, UP.\n", cdev);
                break;
        case CXGB4_STATE_START_RECOVERY:
                pr_info("cdev 0x%p, RECOVERY.\n", cdev);
                /* close all connections */
                break;
        case CXGB4_STATE_DOWN:
                pr_info("cdev 0x%p, DOWN.\n", cdev);
                break;
        case CXGB4_STATE_DETACH:
                pr_info("cdev 0x%p, DETACH.\n", cdev);
                cxgbi_device_unregister(cdev);
                break;
        default:
                pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
                break;
        }
        return 0;
}

#ifdef CONFIG_CHELSIO_T4_DCB
static int
cxgb4_dcb_change_notify(struct notifier_block *self, unsigned long val,
                        void *data)
{
        int i, port = 0xFF;
        struct net_device *ndev;
        struct cxgbi_device *cdev = NULL;
        struct dcb_app_type *iscsi_app = data;
        struct cxgbi_ports_map *pmap;
        u8 priority;

        if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_IEEE) {
                if ((iscsi_app->app.selector != IEEE_8021QAZ_APP_SEL_STREAM) &&
                    (iscsi_app->app.selector != IEEE_8021QAZ_APP_SEL_ANY))
                        return NOTIFY_DONE;

                priority = iscsi_app->app.priority;
        } else if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_CEE) {
                if (iscsi_app->app.selector != DCB_APP_IDTYPE_PORTNUM)
                        return NOTIFY_DONE;

                if (!iscsi_app->app.priority)
                        return NOTIFY_DONE;

                priority = ffs(iscsi_app->app.priority) - 1;
        } else {
                return NOTIFY_DONE;
        }

        if (iscsi_app->app.protocol != 3260)
                return NOTIFY_DONE;

        log_debug(1 << CXGBI_DBG_ISCSI, "iSCSI priority for ifid %d is %u\n",
                  iscsi_app->ifindex, priority);

        ndev = dev_get_by_index(&init_net, iscsi_app->ifindex);
        if (!ndev)
                return NOTIFY_DONE;

        cdev = cxgbi_device_find_by_netdev_rcu(ndev, &port);

        dev_put(ndev);
        if (!cdev)
                return NOTIFY_DONE;

        pmap = &cdev->pmap;

        for (i = 0; i < pmap->used; i++) {
                if (pmap->port_csk[i]) {
                        struct cxgbi_sock *csk = pmap->port_csk[i];

                        if (csk->dcb_priority != priority) {
                                iscsi_conn_failure(csk->user_data,
                                                   ISCSI_ERR_CONN_FAILED);
                                pr_info("Restarting iSCSI connection %p with "
                                        "priority %u->%u.\n", csk,
                                        csk->dcb_priority, priority);
                        }
                }
        }
        return NOTIFY_OK;
}
#endif

static int __init cxgb4i_init_module(void)
{
        int rc;

        printk(KERN_INFO "%s", version);

        rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
        if (rc < 0)
                return rc;
        cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);

#ifdef CONFIG_CHELSIO_T4_DCB
        pr_info("%s dcb enabled.\n", DRV_MODULE_NAME);
        register_dcbevent_notifier(&cxgb4_dcb_change);
#endif
        return 0;
}

static void __exit cxgb4i_exit_module(void)
{
#ifdef CONFIG_CHELSIO_T4_DCB
        unregister_dcbevent_notifier(&cxgb4_dcb_change);
#endif
        cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
        cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
        cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
}

module_init(cxgb4i_init_module);
module_exit(cxgb4i_exit_module);