cm.c

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/*
 * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <linux/module.h>
#include <linux/list.h>
#include <linux/workqueue.h>
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/notifier.h>
#include <linux/inetdevice.h>
#include <linux/ip.h>
#include <linux/tcp.h>

#include <net/neighbour.h>
#include <net/netevent.h>
#include <net/route.h>

#include "iw_cxgb4.h"

static char *states[] = {
    "idle",
    "listen",
    "connecting",
    "mpa_wait_req",
    "mpa_req_sent",
    "mpa_req_rcvd",
    "mpa_rep_sent",
    "fpdu_mode",
    "aborting",
    "closing",
    "moribund",
    "dead",
    NULL,
};

static int dack_mode = 1;
module_param(dack_mode, int, 0644);
MODULE_PARM_DESC(dack_mode, "Delayed ack mode (default=1)");

int c4iw_max_read_depth = 8;
module_param(c4iw_max_read_depth, int, 0644);
MODULE_PARM_DESC(c4iw_max_read_depth, "Per-connection max ORD/IRD (default=8)");

static int enable_tcp_timestamps;
module_param(enable_tcp_timestamps, int, 0644);
MODULE_PARM_DESC(enable_tcp_timestamps, "Enable tcp timestamps (default=0)");

static int enable_tcp_sack;
module_param(enable_tcp_sack, int, 0644);
MODULE_PARM_DESC(enable_tcp_sack, "Enable tcp SACK (default=0)");

static int enable_tcp_window_scaling = 1;
module_param(enable_tcp_window_scaling, int, 0644);
MODULE_PARM_DESC(enable_tcp_window_scaling,
         "Enable tcp window scaling (default=1)");

int c4iw_debug;
module_param(c4iw_debug, int, 0644);
MODULE_PARM_DESC(c4iw_debug, "Enable debug logging (default=0)");

static int peer2peer;
module_param(peer2peer, int, 0644);
MODULE_PARM_DESC(peer2peer, "Support peer2peer ULPs (default=0)");

static int p2p_type = FW_RI_INIT_P2PTYPE_READ_REQ;
module_param(p2p_type, int, 0644);
MODULE_PARM_DESC(p2p_type, "RDMAP opcode to use for the RTR message: "
               "1=RDMA_READ 0=RDMA_WRITE (default 1)");

static int ep_timeout_secs = 60;
module_param(ep_timeout_secs, int, 0644);
MODULE_PARM_DESC(ep_timeout_secs, "CM Endpoint operation timeout "
                   "in seconds (default=60)");

static int mpa_rev = 1;
module_param(mpa_rev, int, 0644);
MODULE_PARM_DESC(mpa_rev, "MPA Revision, 0 supports amso1100, "
        "1 is RFC0544 spec compliant, 2 is IETF MPA Peer Connect Draft"
        " compliant (default=1)");

static int markers_enabled;
module_param(markers_enabled, int, 0644);
MODULE_PARM_DESC(markers_enabled, "Enable MPA MARKERS (default(0)=disabled)");

static int crc_enabled = 1;
module_param(crc_enabled, int, 0644);
MODULE_PARM_DESC(crc_enabled, "Enable MPA CRC (default(1)=enabled)");

static int rcv_win = 256 * 1024;
module_param(rcv_win, int, 0644);
MODULE_PARM_DESC(rcv_win, "TCP receive window in bytes (default=256KB)");

static int snd_win = 128 * 1024;
module_param(snd_win, int, 0644);
MODULE_PARM_DESC(snd_win, "TCP send window in bytes (default=128KB)");

static struct workqueue_struct *workq;

static struct sk_buff_head rxq;

static struct sk_buff *get_skb(struct sk_buff *skb, int len, gfp_t gfp);
static void ep_timeout(unsigned long arg);
static void connect_reply_upcall(struct c4iw_ep *ep, int status);

static LIST_HEAD(timeout_list);
static spinlock_t timeout_lock;

static void start_ep_timer(struct c4iw_ep *ep)
{
    PDBG("%s ep %p\n", __func__, ep);
    if (timer_pending(&ep->timer)) {
        PDBG("%s stopped / restarted timer ep %p\n", __func__, ep);
        del_timer_sync(&ep->timer);
    } else
        c4iw_get_ep(&ep->com);
    ep->timer.expires = jiffies + ep_timeout_secs * HZ;
    ep->timer.data = (unsigned long)ep;
    ep->timer.function = ep_timeout;
    add_timer(&ep->timer);
}

static void stop_ep_timer(struct c4iw_ep *ep)
{
    PDBG("%s ep %p\n", __func__, ep);
    if (!timer_pending(&ep->timer)) {
        printk(KERN_ERR "%s timer stopped when its not running! "
               "ep %p state %u\n", __func__, ep, ep->com.state);
        WARN_ON(1);
        return;
    }
    del_timer_sync(&ep->timer);
    c4iw_put_ep(&ep->com);
}

static int c4iw_l2t_send(struct c4iw_rdev *rdev, struct sk_buff *skb,
          struct l2t_entry *l2e)
{
    int error = 0;

    if (c4iw_fatal_error(rdev)) {
        kfree_skb(skb);
        PDBG("%s - device in error state - dropping\n", __func__);
        return -EIO;
    }
    error = cxgb4_l2t_send(rdev->lldi.ports[0], skb, l2e);
    if (error < 0)
        kfree_skb(skb);
    return error < 0 ? error : 0;
}

int c4iw_ofld_send(struct c4iw_rdev *rdev, struct sk_buff *skb)
{
    int error = 0;

    if (c4iw_fatal_error(rdev)) {
        kfree_skb(skb);
        PDBG("%s - device in error state - dropping\n", __func__);
        return -EIO;
    }
    error = cxgb4_ofld_send(rdev->lldi.ports[0], skb);
    if (error < 0)
        kfree_skb(skb);
    return error < 0 ? error : 0;
}

static void release_tid(struct c4iw_rdev *rdev, u32 hwtid, struct sk_buff *skb)
{
    struct cpl_tid_release *req;

    skb = get_skb(skb, sizeof *req, GFP_KERNEL);
    if (!skb)
        return;
    req = (struct cpl_tid_release *) skb_put(skb, sizeof(*req));
    INIT_TP_WR(req, hwtid);
    OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_TID_RELEASE, hwtid));
    set_wr_txq(skb, CPL_PRIORITY_SETUP, 0);
    c4iw_ofld_send(rdev, skb);
    return;
}

static void set_emss(struct c4iw_ep *ep, u16 opt)
{
    ep->emss = ep->com.dev->rdev.lldi.mtus[GET_TCPOPT_MSS(opt)] - 40;
    ep->mss = ep->emss;
    if (GET_TCPOPT_TSTAMP(opt))
        ep->emss -= 12;
    if (ep->emss < 128)
        ep->emss = 128;
    PDBG("%s mss_idx %u mss %u emss=%u\n", __func__, GET_TCPOPT_MSS(opt),
         ep->mss, ep->emss);
}

static enum c4iw_ep_state state_read(struct c4iw_ep_common *epc)
{
    enum c4iw_ep_state state;

    mutex_lock(&epc->mutex);
    state = epc->state;
    mutex_unlock(&epc->mutex);
    return state;
}

static void __state_set(struct c4iw_ep_common *epc, enum c4iw_ep_state new)
{
    epc->state = new;
}

static void state_set(struct c4iw_ep_common *epc, enum c4iw_ep_state new)
{
    mutex_lock(&epc->mutex);
    PDBG("%s - %s -> %s\n", __func__, states[epc->state], states[new]);
    __state_set(epc, new);
    mutex_unlock(&epc->mutex);
    return;
}

static void *alloc_ep(int size, gfp_t gfp)
{
    struct c4iw_ep_common *epc;

    epc = kzalloc(size, gfp);
    if (epc) {
        kref_init(&epc->kref);
        mutex_init(&epc->mutex);
        c4iw_init_wr_wait(&epc->wr_wait);
    }
    PDBG("%s alloc ep %p\n", __func__, epc);
    return epc;
}

void _c4iw_free_ep(struct kref *kref)
{
    struct c4iw_ep *ep;

    ep = container_of(kref, struct c4iw_ep, com.kref);
    PDBG("%s ep %p state %s\n", __func__, ep, states[state_read(&ep->com)]);
    if (test_bit(RELEASE_RESOURCES, &ep->com.flags)) {
        cxgb4_remove_tid(ep->com.dev->rdev.lldi.tids, 0, ep->hwtid);
        dst_release(ep->dst);
        cxgb4_l2t_release(ep->l2t);
    }
    kfree(ep);
}

static void release_ep_resources(struct c4iw_ep *ep)
{
    set_bit(RELEASE_RESOURCES, &ep->com.flags);
    c4iw_put_ep(&ep->com);
}

static int status2errno(int status)
{
    switch (status) {
    case CPL_ERR_NONE:
        return 0;
    case CPL_ERR_CONN_RESET:
        return -ECONNRESET;
    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;
    }
}

/*
 * Try and reuse skbs already allocated...
 */
static struct sk_buff *get_skb(struct sk_buff *skb, int len, gfp_t gfp)
{
    if (skb && !skb_is_nonlinear(skb) && !skb_cloned(skb)) {
        skb_trim(skb, 0);
        skb_get(skb);
        skb_reset_transport_header(skb);
    } else {
        skb = alloc_skb(len, gfp);
    }
    return skb;
}

static struct rtable *find_route(struct c4iw_dev *dev, __be32 local_ip,
                 __be32 peer_ip, __be16 local_port,
                 __be16 peer_port, u8 tos)
{
    struct rtable *rt;
    struct flowi4 fl4;

    rt = ip_route_output_ports(&init_net, &fl4, NULL, peer_ip, local_ip,
                   peer_port, local_port, IPPROTO_TCP,
                   tos, 0);
    if (IS_ERR(rt))
        return NULL;
    return rt;
}

static void arp_failure_discard(void *handle, struct sk_buff *skb)
{
    PDBG("%s c4iw_dev %p\n", __func__, handle);
    kfree_skb(skb);
}

/*
 * Handle an ARP failure for an active open.
 */
static void act_open_req_arp_failure(void *handle, struct sk_buff *skb)
{
    printk(KERN_ERR MOD "ARP failure duing connect\n");
    kfree_skb(skb);
}

/*
 * Handle an ARP failure for a CPL_ABORT_REQ.  Change it into a no RST variant
 * and send it along.
 */
static void abort_arp_failure(void *handle, struct sk_buff *skb)
{
    struct c4iw_rdev *rdev = handle;
    struct cpl_abort_req *req = cplhdr(skb);

    PDBG("%s rdev %p\n", __func__, rdev);
    req->cmd = CPL_ABORT_NO_RST;
    c4iw_ofld_send(rdev, skb);
}

static void send_flowc(struct c4iw_ep *ep, struct sk_buff *skb)
{
    unsigned int flowclen = 80;
    struct fw_flowc_wr *flowc;
    int i;

    skb = get_skb(skb, flowclen, GFP_KERNEL);
    flowc = (struct fw_flowc_wr *)__skb_put(skb, flowclen);

    flowc->op_to_nparams = cpu_to_be32(FW_WR_OP(FW_FLOWC_WR) |
                       FW_FLOWC_WR_NPARAMS(8));
    flowc->flowid_len16 = cpu_to_be32(FW_WR_LEN16(DIV_ROUND_UP(flowclen,
                      16)) | FW_WR_FLOWID(ep->hwtid));

    flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
    flowc->mnemval[0].val = cpu_to_be32(PCI_FUNC(ep->com.dev->rdev.lldi.pdev->devfn) << 8);
    flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
    flowc->mnemval[1].val = cpu_to_be32(ep->tx_chan);
    flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
    flowc->mnemval[2].val = cpu_to_be32(ep->tx_chan);
    flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
    flowc->mnemval[3].val = cpu_to_be32(ep->rss_qid);
    flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
    flowc->mnemval[4].val = cpu_to_be32(ep->snd_seq);
    flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
    flowc->mnemval[5].val = cpu_to_be32(ep->rcv_seq);
    flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
    flowc->mnemval[6].val = cpu_to_be32(snd_win);
    flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
    flowc->mnemval[7].val = cpu_to_be32(ep->emss);
    /* Pad WR to 16 byte boundary */
    flowc->mnemval[8].mnemonic = 0;
    flowc->mnemval[8].val = 0;
    for (i = 0; i < 9; i++) {
        flowc->mnemval[i].r4[0] = 0;
        flowc->mnemval[i].r4[1] = 0;
        flowc->mnemval[i].r4[2] = 0;
    }

    set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx);
    c4iw_ofld_send(&ep->com.dev->rdev, skb);
}

static int send_halfclose(struct c4iw_ep *ep, gfp_t gfp)
{
    struct cpl_close_con_req *req;
    struct sk_buff *skb;
    int wrlen = roundup(sizeof *req, 16);

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    skb = get_skb(NULL, wrlen, gfp);
    if (!skb) {
        printk(KERN_ERR MOD "%s - failed to alloc skb\n", __func__);
        return -ENOMEM;
    }
    set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx);
    t4_set_arp_err_handler(skb, NULL, arp_failure_discard);
    req = (struct cpl_close_con_req *) skb_put(skb, wrlen);
    memset(req, 0, wrlen);
    INIT_TP_WR(req, ep->hwtid);
    OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ,
                            ep->hwtid));
    return c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
}

static int send_abort(struct c4iw_ep *ep, struct sk_buff *skb, gfp_t gfp)
{
    struct cpl_abort_req *req;
    int wrlen = roundup(sizeof *req, 16);

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    skb = get_skb(skb, wrlen, gfp);
    if (!skb) {
        printk(KERN_ERR MOD "%s - failed to alloc skb.\n",
               __func__);
        return -ENOMEM;
    }
    set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx);
    t4_set_arp_err_handler(skb, &ep->com.dev->rdev, abort_arp_failure);
    req = (struct cpl_abort_req *) skb_put(skb, wrlen);
    memset(req, 0, wrlen);
    INIT_TP_WR(req, ep->hwtid);
    OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, ep->hwtid));
    req->cmd = CPL_ABORT_SEND_RST;
    return c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
}

static int send_connect(struct c4iw_ep *ep)
{
    struct cpl_act_open_req *req;
    struct sk_buff *skb;
    u64 opt0;
    u32 opt2;
    unsigned int mtu_idx;
    int wscale;
    int wrlen = roundup(sizeof *req, 16);

    PDBG("%s ep %p atid %u\n", __func__, ep, ep->atid);

    skb = get_skb(NULL, wrlen, GFP_KERNEL);
    if (!skb) {
        printk(KERN_ERR MOD "%s - failed to alloc skb.\n",
               __func__);
        return -ENOMEM;
    }
    set_wr_txq(skb, CPL_PRIORITY_SETUP, ep->ctrlq_idx);

    cxgb4_best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx);
    wscale = compute_wscale(rcv_win);
    opt0 = KEEP_ALIVE(1) |
           DELACK(1) |
           WND_SCALE(wscale) |
           MSS_IDX(mtu_idx) |
           L2T_IDX(ep->l2t->idx) |
           TX_CHAN(ep->tx_chan) |
           SMAC_SEL(ep->smac_idx) |
           DSCP(ep->tos) |
           ULP_MODE(ULP_MODE_TCPDDP) |
           RCV_BUFSIZ(rcv_win>>10);
    opt2 = RX_CHANNEL(0) |
           RSS_QUEUE_VALID | RSS_QUEUE(ep->rss_qid);
    if (enable_tcp_timestamps)
        opt2 |= TSTAMPS_EN(1);
    if (enable_tcp_sack)
        opt2 |= SACK_EN(1);
    if (wscale && enable_tcp_window_scaling)
        opt2 |= WND_SCALE_EN(1);
    t4_set_arp_err_handler(skb, NULL, act_open_req_arp_failure);

    req = (struct cpl_act_open_req *) skb_put(skb, wrlen);
    INIT_TP_WR(req, 0);
    OPCODE_TID(req) = cpu_to_be32(
        MK_OPCODE_TID(CPL_ACT_OPEN_REQ, ((ep->rss_qid<<14)|ep->atid)));
    req->local_port = ep->com.local_addr.sin_port;
    req->peer_port = ep->com.remote_addr.sin_port;
    req->local_ip = ep->com.local_addr.sin_addr.s_addr;
    req->peer_ip = ep->com.remote_addr.sin_addr.s_addr;
    req->opt0 = cpu_to_be64(opt0);
    req->params = 0;
    req->opt2 = cpu_to_be32(opt2);
    return c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
}

static void send_mpa_req(struct c4iw_ep *ep, struct sk_buff *skb,
        u8 mpa_rev_to_use)
{
    int mpalen, wrlen;
    struct fw_ofld_tx_data_wr *req;
    struct mpa_message *mpa;
    struct mpa_v2_conn_params mpa_v2_params;

    PDBG("%s ep %p tid %u pd_len %d\n", __func__, ep, ep->hwtid, ep->plen);

    BUG_ON(skb_cloned(skb));

    mpalen = sizeof(*mpa) + ep->plen;
    if (mpa_rev_to_use == 2)
        mpalen += sizeof(struct mpa_v2_conn_params);
    wrlen = roundup(mpalen + sizeof *req, 16);
    skb = get_skb(skb, wrlen, GFP_KERNEL);
    if (!skb) {
        connect_reply_upcall(ep, -ENOMEM);
        return;
    }
    set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx);

    req = (struct fw_ofld_tx_data_wr *)skb_put(skb, wrlen);
    memset(req, 0, wrlen);
    req->op_to_immdlen = cpu_to_be32(
        FW_WR_OP(FW_OFLD_TX_DATA_WR) |
        FW_WR_COMPL(1) |
        FW_WR_IMMDLEN(mpalen));
    req->flowid_len16 = cpu_to_be32(
        FW_WR_FLOWID(ep->hwtid) |
        FW_WR_LEN16(wrlen >> 4));
    req->plen = cpu_to_be32(mpalen);
    req->tunnel_to_proxy = cpu_to_be32(
        FW_OFLD_TX_DATA_WR_FLUSH(1) |
        FW_OFLD_TX_DATA_WR_SHOVE(1));

    mpa = (struct mpa_message *)(req + 1);
    memcpy(mpa->key, MPA_KEY_REQ, sizeof(mpa->key));
    mpa->flags = (crc_enabled ? MPA_CRC : 0) |
             (markers_enabled ? MPA_MARKERS : 0) |
             (mpa_rev_to_use == 2 ? MPA_ENHANCED_RDMA_CONN : 0);
    mpa->private_data_size = htons(ep->plen);
    mpa->revision = mpa_rev_to_use;
    if (mpa_rev_to_use == 1) {
        ep->tried_with_mpa_v1 = 1;
        ep->retry_with_mpa_v1 = 0;
    }

    if (mpa_rev_to_use == 2) {
        mpa->private_data_size = htons(ntohs(mpa->private_data_size) +
                           sizeof (struct mpa_v2_conn_params));
        mpa_v2_params.ird = htons((u16)ep->ird);
        mpa_v2_params.ord = htons((u16)ep->ord);

        if (peer2peer) {
            mpa_v2_params.ird |= htons(MPA_V2_PEER2PEER_MODEL);
            if (p2p_type == FW_RI_INIT_P2PTYPE_RDMA_WRITE)
                mpa_v2_params.ord |=
                    htons(MPA_V2_RDMA_WRITE_RTR);
            else if (p2p_type == FW_RI_INIT_P2PTYPE_READ_REQ)
                mpa_v2_params.ord |=
                    htons(MPA_V2_RDMA_READ_RTR);
        }
        memcpy(mpa->private_data, &mpa_v2_params,
               sizeof(struct mpa_v2_conn_params));

        if (ep->plen)
            memcpy(mpa->private_data +
                   sizeof(struct mpa_v2_conn_params),
                   ep->mpa_pkt + sizeof(*mpa), ep->plen);
    } else
        if (ep->plen)
            memcpy(mpa->private_data,
                    ep->mpa_pkt + sizeof(*mpa), ep->plen);

    /*
     * Reference the mpa skb.  This ensures the data area
     * will remain in memory until the hw acks the tx.
     * Function fw4_ack() will deref it.
     */
    skb_get(skb);
    t4_set_arp_err_handler(skb, NULL, arp_failure_discard);
    BUG_ON(ep->mpa_skb);
    ep->mpa_skb = skb;
    c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
    start_ep_timer(ep);
    state_set(&ep->com, MPA_REQ_SENT);
    ep->mpa_attr.initiator = 1;
    return;
}

static int send_mpa_reject(struct c4iw_ep *ep, const void *pdata, u8 plen)
{
    int mpalen, wrlen;
    struct fw_ofld_tx_data_wr *req;
    struct mpa_message *mpa;
    struct sk_buff *skb;
    struct mpa_v2_conn_params mpa_v2_params;

    PDBG("%s ep %p tid %u pd_len %d\n", __func__, ep, ep->hwtid, ep->plen);

    mpalen = sizeof(*mpa) + plen;
    if (ep->mpa_attr.version == 2 && ep->mpa_attr.enhanced_rdma_conn)
        mpalen += sizeof(struct mpa_v2_conn_params);
    wrlen = roundup(mpalen + sizeof *req, 16);

    skb = get_skb(NULL, wrlen, GFP_KERNEL);
    if (!skb) {
        printk(KERN_ERR MOD "%s - cannot alloc skb!\n", __func__);
        return -ENOMEM;
    }
    set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx);

    req = (struct fw_ofld_tx_data_wr *)skb_put(skb, wrlen);
    memset(req, 0, wrlen);
    req->op_to_immdlen = cpu_to_be32(
        FW_WR_OP(FW_OFLD_TX_DATA_WR) |
        FW_WR_COMPL(1) |
        FW_WR_IMMDLEN(mpalen));
    req->flowid_len16 = cpu_to_be32(
        FW_WR_FLOWID(ep->hwtid) |
        FW_WR_LEN16(wrlen >> 4));
    req->plen = cpu_to_be32(mpalen);
    req->tunnel_to_proxy = cpu_to_be32(
        FW_OFLD_TX_DATA_WR_FLUSH(1) |
        FW_OFLD_TX_DATA_WR_SHOVE(1));

    mpa = (struct mpa_message *)(req + 1);
    memset(mpa, 0, sizeof(*mpa));
    memcpy(mpa->key, MPA_KEY_REP, sizeof(mpa->key));
    mpa->flags = MPA_REJECT;
    mpa->revision = mpa_rev;
    mpa->private_data_size = htons(plen);

    if (ep->mpa_attr.version == 2 && ep->mpa_attr.enhanced_rdma_conn) {
        mpa->flags |= MPA_ENHANCED_RDMA_CONN;
        mpa->private_data_size = htons(ntohs(mpa->private_data_size) +
                           sizeof (struct mpa_v2_conn_params));
        mpa_v2_params.ird = htons(((u16)ep->ird) |
                      (peer2peer ? MPA_V2_PEER2PEER_MODEL :
                       0));
        mpa_v2_params.ord = htons(((u16)ep->ord) | (peer2peer ?
                      (p2p_type ==
                       FW_RI_INIT_P2PTYPE_RDMA_WRITE ?
                       MPA_V2_RDMA_WRITE_RTR : p2p_type ==
                       FW_RI_INIT_P2PTYPE_READ_REQ ?
                       MPA_V2_RDMA_READ_RTR : 0) : 0));
        memcpy(mpa->private_data, &mpa_v2_params,
               sizeof(struct mpa_v2_conn_params));

        if (ep->plen)
            memcpy(mpa->private_data +
                   sizeof(struct mpa_v2_conn_params), pdata, plen);
    } else
        if (plen)
            memcpy(mpa->private_data, pdata, plen);

    /*
     * Reference the mpa skb again.  This ensures the data area
     * will remain in memory until the hw acks the tx.
     * Function fw4_ack() will deref it.
     */
    skb_get(skb);
    set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx);
    t4_set_arp_err_handler(skb, NULL, arp_failure_discard);
    BUG_ON(ep->mpa_skb);
    ep->mpa_skb = skb;
    return c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
}

static int send_mpa_reply(struct c4iw_ep *ep, const void *pdata, u8 plen)
{
    int mpalen, wrlen;
    struct fw_ofld_tx_data_wr *req;
    struct mpa_message *mpa;
    struct sk_buff *skb;
    struct mpa_v2_conn_params mpa_v2_params;

    PDBG("%s ep %p tid %u pd_len %d\n", __func__, ep, ep->hwtid, ep->plen);

    mpalen = sizeof(*mpa) + plen;
    if (ep->mpa_attr.version == 2 && ep->mpa_attr.enhanced_rdma_conn)
        mpalen += sizeof(struct mpa_v2_conn_params);
    wrlen = roundup(mpalen + sizeof *req, 16);

    skb = get_skb(NULL, wrlen, GFP_KERNEL);
    if (!skb) {
        printk(KERN_ERR MOD "%s - cannot alloc skb!\n", __func__);
        return -ENOMEM;
    }
    set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx);

    req = (struct fw_ofld_tx_data_wr *) skb_put(skb, wrlen);
    memset(req, 0, wrlen);
    req->op_to_immdlen = cpu_to_be32(
        FW_WR_OP(FW_OFLD_TX_DATA_WR) |
        FW_WR_COMPL(1) |
        FW_WR_IMMDLEN(mpalen));
    req->flowid_len16 = cpu_to_be32(
        FW_WR_FLOWID(ep->hwtid) |
        FW_WR_LEN16(wrlen >> 4));
    req->plen = cpu_to_be32(mpalen);
    req->tunnel_to_proxy = cpu_to_be32(
        FW_OFLD_TX_DATA_WR_FLUSH(1) |
        FW_OFLD_TX_DATA_WR_SHOVE(1));

    mpa = (struct mpa_message *)(req + 1);
    memset(mpa, 0, sizeof(*mpa));
    memcpy(mpa->key, MPA_KEY_REP, sizeof(mpa->key));
    mpa->flags = (ep->mpa_attr.crc_enabled ? MPA_CRC : 0) |
             (markers_enabled ? MPA_MARKERS : 0);
    mpa->revision = ep->mpa_attr.version;
    mpa->private_data_size = htons(plen);

    if (ep->mpa_attr.version == 2 && ep->mpa_attr.enhanced_rdma_conn) {
        mpa->flags |= MPA_ENHANCED_RDMA_CONN;
        mpa->private_data_size = htons(ntohs(mpa->private_data_size) +
                           sizeof (struct mpa_v2_conn_params));
        mpa_v2_params.ird = htons((u16)ep->ird);
        mpa_v2_params.ord = htons((u16)ep->ord);
        if (peer2peer && (ep->mpa_attr.p2p_type !=
                    FW_RI_INIT_P2PTYPE_DISABLED)) {
            mpa_v2_params.ird |= htons(MPA_V2_PEER2PEER_MODEL);

            if (p2p_type == FW_RI_INIT_P2PTYPE_RDMA_WRITE)
                mpa_v2_params.ord |=
                    htons(MPA_V2_RDMA_WRITE_RTR);
            else if (p2p_type == FW_RI_INIT_P2PTYPE_READ_REQ)
                mpa_v2_params.ord |=
                    htons(MPA_V2_RDMA_READ_RTR);
        }

        memcpy(mpa->private_data, &mpa_v2_params,
               sizeof(struct mpa_v2_conn_params));

        if (ep->plen)
            memcpy(mpa->private_data +
                   sizeof(struct mpa_v2_conn_params), pdata, plen);
    } else
        if (plen)
            memcpy(mpa->private_data, pdata, plen);

    /*
     * Reference the mpa skb.  This ensures the data area
     * will remain in memory until the hw acks the tx.
     * Function fw4_ack() will deref it.
     */
    skb_get(skb);
    t4_set_arp_err_handler(skb, NULL, arp_failure_discard);
    ep->mpa_skb = skb;
    state_set(&ep->com, MPA_REP_SENT);
    return c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
}

static int act_establish(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct c4iw_ep *ep;
    struct cpl_act_establish *req = cplhdr(skb);
    unsigned int tid = GET_TID(req);
    unsigned int atid = GET_TID_TID(ntohl(req->tos_atid));
    struct tid_info *t = dev->rdev.lldi.tids;

    ep = lookup_atid(t, atid);

    PDBG("%s ep %p tid %u snd_isn %u rcv_isn %u\n", __func__, ep, tid,
         be32_to_cpu(req->snd_isn), be32_to_cpu(req->rcv_isn));

    dst_confirm(ep->dst);

    /* setup the hwtid for this connection */
    ep->hwtid = tid;
    cxgb4_insert_tid(t, ep, tid);

    ep->snd_seq = be32_to_cpu(req->snd_isn);
    ep->rcv_seq = be32_to_cpu(req->rcv_isn);

    set_emss(ep, ntohs(req->tcp_opt));

    /* dealloc the atid */
    cxgb4_free_atid(t, atid);

    /* start MPA negotiation */
    send_flowc(ep, NULL);
    if (ep->retry_with_mpa_v1)
        send_mpa_req(ep, skb, 1);
    else
        send_mpa_req(ep, skb, mpa_rev);

    return 0;
}

static void close_complete_upcall(struct c4iw_ep *ep)
{
    struct iw_cm_event event;

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    memset(&event, 0, sizeof(event));
    event.event = IW_CM_EVENT_CLOSE;
    if (ep->com.cm_id) {
        PDBG("close complete delivered ep %p cm_id %p tid %u\n",
             ep, ep->com.cm_id, ep->hwtid);
        ep->com.cm_id->event_handler(ep->com.cm_id, &event);
        ep->com.cm_id->rem_ref(ep->com.cm_id);
        ep->com.cm_id = NULL;
        ep->com.qp = NULL;
    }
}

static int abort_connection(struct c4iw_ep *ep, struct sk_buff *skb, gfp_t gfp)
{
    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    close_complete_upcall(ep);
    state_set(&ep->com, ABORTING);
    return send_abort(ep, skb, gfp);
}

static void peer_close_upcall(struct c4iw_ep *ep)
{
    struct iw_cm_event event;

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    memset(&event, 0, sizeof(event));
    event.event = IW_CM_EVENT_DISCONNECT;
    if (ep->com.cm_id) {
        PDBG("peer close delivered ep %p cm_id %p tid %u\n",
             ep, ep->com.cm_id, ep->hwtid);
        ep->com.cm_id->event_handler(ep->com.cm_id, &event);
    }
}

static void peer_abort_upcall(struct c4iw_ep *ep)
{
    struct iw_cm_event event;

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    memset(&event, 0, sizeof(event));
    event.event = IW_CM_EVENT_CLOSE;
    event.status = -ECONNRESET;
    if (ep->com.cm_id) {
        PDBG("abort delivered ep %p cm_id %p tid %u\n", ep,
             ep->com.cm_id, ep->hwtid);
        ep->com.cm_id->event_handler(ep->com.cm_id, &event);
        ep->com.cm_id->rem_ref(ep->com.cm_id);
        ep->com.cm_id = NULL;
        ep->com.qp = NULL;
    }
}

static void connect_reply_upcall(struct c4iw_ep *ep, int status)
{
    struct iw_cm_event event;

    PDBG("%s ep %p tid %u status %d\n", __func__, ep, ep->hwtid, status);
    memset(&event, 0, sizeof(event));
    event.event = IW_CM_EVENT_CONNECT_REPLY;
    event.status = status;
    event.local_addr = ep->com.local_addr;
    event.remote_addr = ep->com.remote_addr;

    if ((status == 0) || (status == -ECONNREFUSED)) {
        if (!ep->tried_with_mpa_v1) {
            /* this means MPA_v2 is used */
            event.private_data_len = ep->plen -
                sizeof(struct mpa_v2_conn_params);
            event.private_data = ep->mpa_pkt +
                sizeof(struct mpa_message) +
                sizeof(struct mpa_v2_conn_params);
        } else {
            /* this means MPA_v1 is used */
            event.private_data_len = ep->plen;
            event.private_data = ep->mpa_pkt +
                sizeof(struct mpa_message);
        }
    }

    PDBG("%s ep %p tid %u status %d\n", __func__, ep,
         ep->hwtid, status);
    ep->com.cm_id->event_handler(ep->com.cm_id, &event);

    if (status < 0) {
        ep->com.cm_id->rem_ref(ep->com.cm_id);
        ep->com.cm_id = NULL;
        ep->com.qp = NULL;
    }
}

static void connect_request_upcall(struct c4iw_ep *ep)
{
    struct iw_cm_event event;

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    memset(&event, 0, sizeof(event));
    event.event = IW_CM_EVENT_CONNECT_REQUEST;
    event.local_addr = ep->com.local_addr;
    event.remote_addr = ep->com.remote_addr;
    event.provider_data = ep;
    if (!ep->tried_with_mpa_v1) {
        /* this means MPA_v2 is used */
        event.ord = ep->ord;
        event.ird = ep->ird;
        event.private_data_len = ep->plen -
            sizeof(struct mpa_v2_conn_params);
        event.private_data = ep->mpa_pkt + sizeof(struct mpa_message) +
            sizeof(struct mpa_v2_conn_params);
    } else {
        /* this means MPA_v1 is used. Send max supported */
        event.ord = c4iw_max_read_depth;
        event.ird = c4iw_max_read_depth;
        event.private_data_len = ep->plen;
        event.private_data = ep->mpa_pkt + sizeof(struct mpa_message);
    }
    if (state_read(&ep->parent_ep->com) != DEAD) {
        c4iw_get_ep(&ep->com);
        ep->parent_ep->com.cm_id->event_handler(
                        ep->parent_ep->com.cm_id,
                        &event);
    }
    c4iw_put_ep(&ep->parent_ep->com);
    ep->parent_ep = NULL;
}

static void established_upcall(struct c4iw_ep *ep)
{
    struct iw_cm_event event;

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    memset(&event, 0, sizeof(event));
    event.event = IW_CM_EVENT_ESTABLISHED;
    event.ird = ep->ird;
    event.ord = ep->ord;
    if (ep->com.cm_id) {
        PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
        ep->com.cm_id->event_handler(ep->com.cm_id, &event);
    }
}

static int update_rx_credits(struct c4iw_ep *ep, u32 credits)
{
    struct cpl_rx_data_ack *req;
    struct sk_buff *skb;
    int wrlen = roundup(sizeof *req, 16);

    PDBG("%s ep %p tid %u credits %u\n", __func__, ep, ep->hwtid, credits);
    skb = get_skb(NULL, wrlen, GFP_KERNEL);
    if (!skb) {
        printk(KERN_ERR MOD "update_rx_credits - cannot alloc skb!\n");
        return 0;
    }

    req = (struct cpl_rx_data_ack *) skb_put(skb, wrlen);
    memset(req, 0, wrlen);
    INIT_TP_WR(req, ep->hwtid);
    OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
                            ep->hwtid));
    req->credit_dack = cpu_to_be32(credits | RX_FORCE_ACK(1) |
                       F_RX_DACK_CHANGE |
                       V_RX_DACK_MODE(dack_mode));
    set_wr_txq(skb, CPL_PRIORITY_ACK, ep->ctrlq_idx);
    c4iw_ofld_send(&ep->com.dev->rdev, skb);
    return credits;
}

static void process_mpa_reply(struct c4iw_ep *ep, struct sk_buff *skb)
{
    struct mpa_message *mpa;
    struct mpa_v2_conn_params *mpa_v2_params;
    u16 plen;
    u16 resp_ird, resp_ord;
    u8 rtr_mismatch = 0, insuff_ird = 0;
    struct c4iw_qp_attributes attrs;
    enum c4iw_qp_attr_mask mask;
    int err;

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);

    /*
     * Stop mpa timer.  If it expired, then the state has
     * changed and we bail since ep_timeout already aborted
     * the connection.
     */
    stop_ep_timer(ep);
    if (state_read(&ep->com) != MPA_REQ_SENT)
        return;

    /*
     * If we get more than the supported amount of private data
     * then we must fail this connection.
     */
    if (ep->mpa_pkt_len + skb->len > sizeof(ep->mpa_pkt)) {
        err = -EINVAL;
        goto err;
    }

    /*
     * copy the new data into our accumulation buffer.
     */
    skb_copy_from_linear_data(skb, &(ep->mpa_pkt[ep->mpa_pkt_len]),
                  skb->len);
    ep->mpa_pkt_len += skb->len;

    /*
     * if we don't even have the mpa message, then bail.
     */
    if (ep->mpa_pkt_len < sizeof(*mpa))
        return;
    mpa = (struct mpa_message *) ep->mpa_pkt;

    /* Validate MPA header. */
    if (mpa->revision > mpa_rev) {
        printk(KERN_ERR MOD "%s MPA version mismatch. Local = %d,"
               " Received = %d\n", __func__, mpa_rev, mpa->revision);
        err = -EPROTO;
        goto err;
    }
    if (memcmp(mpa->key, MPA_KEY_REP, sizeof(mpa->key))) {
        err = -EPROTO;
        goto err;
    }

    plen = ntohs(mpa->private_data_size);

    /*
     * Fail if there's too much private data.
     */
    if (plen > MPA_MAX_PRIVATE_DATA) {
        err = -EPROTO;
        goto err;
    }

    /*
     * If plen does not account for pkt size
     */
    if (ep->mpa_pkt_len > (sizeof(*mpa) + plen)) {
        err = -EPROTO;
        goto err;
    }

    ep->plen = (u8) plen;

    /*
     * If we don't have all the pdata yet, then bail.
     * We'll continue process when more data arrives.
     */
    if (ep->mpa_pkt_len < (sizeof(*mpa) + plen))
        return;

    if (mpa->flags & MPA_REJECT) {
        err = -ECONNREFUSED;
        goto err;
    }

    /*
     * If we get here we have accumulated the entire mpa
     * start reply message including private data. And
     * the MPA header is valid.
     */
    state_set(&ep->com, FPDU_MODE);
    ep->mpa_attr.crc_enabled = (mpa->flags & MPA_CRC) | crc_enabled ? 1 : 0;
    ep->mpa_attr.recv_marker_enabled = markers_enabled;
    ep->mpa_attr.xmit_marker_enabled = mpa->flags & MPA_MARKERS ? 1 : 0;
    ep->mpa_attr.version = mpa->revision;
    ep->mpa_attr.p2p_type = FW_RI_INIT_P2PTYPE_DISABLED;

    if (mpa->revision == 2) {
        ep->mpa_attr.enhanced_rdma_conn =
            mpa->flags & MPA_ENHANCED_RDMA_CONN ? 1 : 0;
        if (ep->mpa_attr.enhanced_rdma_conn) {
            mpa_v2_params = (struct mpa_v2_conn_params *)
                (ep->mpa_pkt + sizeof(*mpa));
            resp_ird = ntohs(mpa_v2_params->ird) &
                MPA_V2_IRD_ORD_MASK;
            resp_ord = ntohs(mpa_v2_params->ord) &
                MPA_V2_IRD_ORD_MASK;

            /*
             * This is a double-check. Ideally, below checks are
             * not required since ird/ord stuff has been taken
             * care of in c4iw_accept_cr
             */
            if ((ep->ird < resp_ord) || (ep->ord > resp_ird)) {
                err = -ENOMEM;
                ep->ird = resp_ord;
                ep->ord = resp_ird;
                insuff_ird = 1;
            }

            if (ntohs(mpa_v2_params->ird) &
                    MPA_V2_PEER2PEER_MODEL) {
                if (ntohs(mpa_v2_params->ord) &
                        MPA_V2_RDMA_WRITE_RTR)
                    ep->mpa_attr.p2p_type =
                        FW_RI_INIT_P2PTYPE_RDMA_WRITE;
                else if (ntohs(mpa_v2_params->ord) &
                        MPA_V2_RDMA_READ_RTR)
                    ep->mpa_attr.p2p_type =
                        FW_RI_INIT_P2PTYPE_READ_REQ;
            }
        }
    } else if (mpa->revision == 1)
        if (peer2peer)
            ep->mpa_attr.p2p_type = p2p_type;

    PDBG("%s - crc_enabled=%d, recv_marker_enabled=%d, "
         "xmit_marker_enabled=%d, version=%d p2p_type=%d local-p2p_type = "
         "%d\n", __func__, ep->mpa_attr.crc_enabled,
         ep->mpa_attr.recv_marker_enabled,
         ep->mpa_attr.xmit_marker_enabled, ep->mpa_attr.version,
         ep->mpa_attr.p2p_type, p2p_type);

    /*
     * If responder's RTR does not match with that of initiator, assign
     * FW_RI_INIT_P2PTYPE_DISABLED in mpa attributes so that RTR is not
     * generated when moving QP to RTS state.
     * A TERM message will be sent after QP has moved to RTS state
     */
    if ((ep->mpa_attr.version == 2) && peer2peer &&
            (ep->mpa_attr.p2p_type != p2p_type)) {
        ep->mpa_attr.p2p_type = FW_RI_INIT_P2PTYPE_DISABLED;
        rtr_mismatch = 1;
    }

    attrs.mpa_attr = ep->mpa_attr;
    attrs.max_ird = ep->ird;
    attrs.max_ord = ep->ord;
    attrs.llp_stream_handle = ep;
    attrs.next_state = C4IW_QP_STATE_RTS;

    mask = C4IW_QP_ATTR_NEXT_STATE |
        C4IW_QP_ATTR_LLP_STREAM_HANDLE | C4IW_QP_ATTR_MPA_ATTR |
        C4IW_QP_ATTR_MAX_IRD | C4IW_QP_ATTR_MAX_ORD;

    /* bind QP and TID with INIT_WR */
    err = c4iw_modify_qp(ep->com.qp->rhp,
                 ep->com.qp, mask, &attrs, 1);
    if (err)
        goto err;

    /*
     * If responder's RTR requirement did not match with what initiator
     * supports, generate TERM message
     */
    if (rtr_mismatch) {
        printk(KERN_ERR "%s: RTR mismatch, sending TERM\n", __func__);
        attrs.layer_etype = LAYER_MPA | DDP_LLP;
        attrs.ecode = MPA_NOMATCH_RTR;
        attrs.next_state = C4IW_QP_STATE_TERMINATE;
        err = c4iw_modify_qp(ep->com.qp->rhp, ep->com.qp,
                C4IW_QP_ATTR_NEXT_STATE, &attrs, 0);
        err = -ENOMEM;
        goto out;
    }

    /*
     * Generate TERM if initiator IRD is not sufficient for responder
     * provided ORD. Currently, we do the same behaviour even when
     * responder provided IRD is also not sufficient as regards to
     * initiator ORD.
     */
    if (insuff_ird) {
        printk(KERN_ERR "%s: Insufficient IRD, sending TERM\n",
                __func__);
        attrs.layer_etype = LAYER_MPA | DDP_LLP;
        attrs.ecode = MPA_INSUFF_IRD;
        attrs.next_state = C4IW_QP_STATE_TERMINATE;
        err = c4iw_modify_qp(ep->com.qp->rhp, ep->com.qp,
                C4IW_QP_ATTR_NEXT_STATE, &attrs, 0);
        err = -ENOMEM;
        goto out;
    }
    goto out;
err:
    state_set(&ep->com, ABORTING);
    send_abort(ep, skb, GFP_KERNEL);
out:
    connect_reply_upcall(ep, err);
    return;
}

static void process_mpa_request(struct c4iw_ep *ep, struct sk_buff *skb)
{
    struct mpa_message *mpa;
    struct mpa_v2_conn_params *mpa_v2_params;
    u16 plen;

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);

    if (state_read(&ep->com) != MPA_REQ_WAIT)
        return;

    /*
     * If we get more than the supported amount of private data
     * then we must fail this connection.
     */
    if (ep->mpa_pkt_len + skb->len > sizeof(ep->mpa_pkt)) {
        stop_ep_timer(ep);
        abort_connection(ep, skb, GFP_KERNEL);
        return;
    }

    PDBG("%s enter (%s line %u)\n", __func__, __FILE__, __LINE__);

    /*
     * Copy the new data into our accumulation buffer.
     */
    skb_copy_from_linear_data(skb, &(ep->mpa_pkt[ep->mpa_pkt_len]),
                  skb->len);
    ep->mpa_pkt_len += skb->len;

    /*
     * If we don't even have the mpa message, then bail.
     * We'll continue process when more data arrives.
     */
    if (ep->mpa_pkt_len < sizeof(*mpa))
        return;

    PDBG("%s enter (%s line %u)\n", __func__, __FILE__, __LINE__);
    stop_ep_timer(ep);
    mpa = (struct mpa_message *) ep->mpa_pkt;

    /*
     * Validate MPA Header.
     */
    if (mpa->revision > mpa_rev) {
        printk(KERN_ERR MOD "%s MPA version mismatch. Local = %d,"
               " Received = %d\n", __func__, mpa_rev, mpa->revision);
        abort_connection(ep, skb, GFP_KERNEL);
        return;
    }

    if (memcmp(mpa->key, MPA_KEY_REQ, sizeof(mpa->key))) {
        abort_connection(ep, skb, GFP_KERNEL);
        return;
    }

    plen = ntohs(mpa->private_data_size);

    /*
     * Fail if there's too much private data.
     */
    if (plen > MPA_MAX_PRIVATE_DATA) {
        abort_connection(ep, skb, GFP_KERNEL);
        return;
    }

    /*
     * If plen does not account for pkt size
     */
    if (ep->mpa_pkt_len > (sizeof(*mpa) + plen)) {
        abort_connection(ep, skb, GFP_KERNEL);
        return;
    }
    ep->plen = (u8) plen;

    /*
     * If we don't have all the pdata yet, then bail.
     */
    if (ep->mpa_pkt_len < (sizeof(*mpa) + plen))
        return;

    /*
     * If we get here we have accumulated the entire mpa
     * start reply message including private data.
     */
    ep->mpa_attr.initiator = 0;
    ep->mpa_attr.crc_enabled = (mpa->flags & MPA_CRC) | crc_enabled ? 1 : 0;
    ep->mpa_attr.recv_marker_enabled = markers_enabled;
    ep->mpa_attr.xmit_marker_enabled = mpa->flags & MPA_MARKERS ? 1 : 0;
    ep->mpa_attr.version = mpa->revision;
    if (mpa->revision == 1)
        ep->tried_with_mpa_v1 = 1;
    ep->mpa_attr.p2p_type = FW_RI_INIT_P2PTYPE_DISABLED;

    if (mpa->revision == 2) {
        ep->mpa_attr.enhanced_rdma_conn =
            mpa->flags & MPA_ENHANCED_RDMA_CONN ? 1 : 0;
        if (ep->mpa_attr.enhanced_rdma_conn) {
            mpa_v2_params = (struct mpa_v2_conn_params *)
                (ep->mpa_pkt + sizeof(*mpa));
            ep->ird = ntohs(mpa_v2_params->ird) &
                MPA_V2_IRD_ORD_MASK;
            ep->ord = ntohs(mpa_v2_params->ord) &
                MPA_V2_IRD_ORD_MASK;
            if (ntohs(mpa_v2_params->ird) & MPA_V2_PEER2PEER_MODEL)
                if (peer2peer) {
                    if (ntohs(mpa_v2_params->ord) &
                            MPA_V2_RDMA_WRITE_RTR)
                        ep->mpa_attr.p2p_type =
                        FW_RI_INIT_P2PTYPE_RDMA_WRITE;
                    else if (ntohs(mpa_v2_params->ord) &
                            MPA_V2_RDMA_READ_RTR)
                        ep->mpa_attr.p2p_type =
                        FW_RI_INIT_P2PTYPE_READ_REQ;
                }
        }
    } else if (mpa->revision == 1)
        if (peer2peer)
            ep->mpa_attr.p2p_type = p2p_type;

    PDBG("%s - crc_enabled=%d, recv_marker_enabled=%d, "
         "xmit_marker_enabled=%d, version=%d p2p_type=%d\n", __func__,
         ep->mpa_attr.crc_enabled, ep->mpa_attr.recv_marker_enabled,
         ep->mpa_attr.xmit_marker_enabled, ep->mpa_attr.version,
         ep->mpa_attr.p2p_type);

    state_set(&ep->com, MPA_REQ_RCVD);

    /* drive upcall */
    connect_request_upcall(ep);
    return;
}

static int rx_data(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct c4iw_ep *ep;
    struct cpl_rx_data *hdr = cplhdr(skb);
    unsigned int dlen = ntohs(hdr->len);
    unsigned int tid = GET_TID(hdr);
    struct tid_info *t = dev->rdev.lldi.tids;

    ep = lookup_tid(t, tid);
    PDBG("%s ep %p tid %u dlen %u\n", __func__, ep, ep->hwtid, dlen);
    skb_pull(skb, sizeof(*hdr));
    skb_trim(skb, dlen);

    ep->rcv_seq += dlen;
    BUG_ON(ep->rcv_seq != (ntohl(hdr->seq) + dlen));

    /* update RX credits */
    update_rx_credits(ep, dlen);

    switch (state_read(&ep->com)) {
    case MPA_REQ_SENT:
        process_mpa_reply(ep, skb);
        break;
    case MPA_REQ_WAIT:
        process_mpa_request(ep, skb);
        break;
    case MPA_REP_SENT:
        break;
    default:
        printk(KERN_ERR MOD "%s Unexpected streaming data."
               " ep %p state %d tid %u\n",
               __func__, ep, state_read(&ep->com), ep->hwtid);

        /*
         * The ep will timeout and inform the ULP of the failure.
         * See ep_timeout().
         */
        break;
    }
    return 0;
}

static int abort_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct c4iw_ep *ep;
    struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
    int release = 0;
    unsigned int tid = GET_TID(rpl);
    struct tid_info *t = dev->rdev.lldi.tids;

    ep = lookup_tid(t, tid);
    if (!ep) {
        printk(KERN_WARNING MOD "Abort rpl to freed endpoint\n");
        return 0;
    }
    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    mutex_lock(&ep->com.mutex);
    switch (ep->com.state) {
    case ABORTING:
        __state_set(&ep->com, DEAD);
        release = 1;
        break;
    default:
        printk(KERN_ERR "%s ep %p state %d\n",
             __func__, ep, ep->com.state);
        break;
    }
    mutex_unlock(&ep->com.mutex);

    if (release)
        release_ep_resources(ep);
    return 0;
}

/*
 * Return whether a failed active open has allocated a TID
 */
static inline int act_open_has_tid(int status)
{
    return status != CPL_ERR_TCAM_FULL && status != CPL_ERR_CONN_EXIST &&
           status != CPL_ERR_ARP_MISS;
}

static int act_open_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct c4iw_ep *ep;
    struct cpl_act_open_rpl *rpl = cplhdr(skb);
    unsigned int atid = GET_TID_TID(GET_AOPEN_ATID(
                    ntohl(rpl->atid_status)));
    struct tid_info *t = dev->rdev.lldi.tids;
    int status = GET_AOPEN_STATUS(ntohl(rpl->atid_status));

    ep = lookup_atid(t, atid);

    PDBG("%s ep %p atid %u status %u errno %d\n", __func__, ep, atid,
         status, status2errno(status));

    if (status == CPL_ERR_RTX_NEG_ADVICE) {
        printk(KERN_WARNING MOD "Connection problems for atid %u\n",
            atid);
        return 0;
    }

    /*
     * Log interesting failures.
     */
    switch (status) {
    case CPL_ERR_CONN_RESET:
    case CPL_ERR_CONN_TIMEDOUT:
        break;
    default:
        printk(KERN_INFO MOD "Active open failure - "
               "atid %u status %u errno %d %pI4:%u->%pI4:%u\n",
               atid, status, status2errno(status),
               &ep->com.local_addr.sin_addr.s_addr,
               ntohs(ep->com.local_addr.sin_port),
               &ep->com.remote_addr.sin_addr.s_addr,
               ntohs(ep->com.remote_addr.sin_port));
        break;
    }

    connect_reply_upcall(ep, status2errno(status));
    state_set(&ep->com, DEAD);

    if (status && act_open_has_tid(status))
        cxgb4_remove_tid(ep->com.dev->rdev.lldi.tids, 0, GET_TID(rpl));

    cxgb4_free_atid(t, atid);
    dst_release(ep->dst);
    cxgb4_l2t_release(ep->l2t);
    c4iw_put_ep(&ep->com);

    return 0;
}

static int pass_open_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct cpl_pass_open_rpl *rpl = cplhdr(skb);
    struct tid_info *t = dev->rdev.lldi.tids;
    unsigned int stid = GET_TID(rpl);
    struct c4iw_listen_ep *ep = lookup_stid(t, stid);

    if (!ep) {
        printk(KERN_ERR MOD "stid %d lookup failure!\n", stid);
        return 0;
    }
    PDBG("%s ep %p status %d error %d\n", __func__, ep,
         rpl->status, status2errno(rpl->status));
    c4iw_wake_up(&ep->com.wr_wait, status2errno(rpl->status));

    return 0;
}

static int listen_stop(struct c4iw_listen_ep *ep)
{
    struct sk_buff *skb;
    struct cpl_close_listsvr_req *req;

    PDBG("%s ep %p\n", __func__, ep);
    skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
    if (!skb) {
        printk(KERN_ERR MOD "%s - failed to alloc skb\n", __func__);
        return -ENOMEM;
    }
    req = (struct cpl_close_listsvr_req *) skb_put(skb, sizeof(*req));
    INIT_TP_WR(req, 0);
    OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_LISTSRV_REQ,
                            ep->stid));
    req->reply_ctrl = cpu_to_be16(
              QUEUENO(ep->com.dev->rdev.lldi.rxq_ids[0]));
    set_wr_txq(skb, CPL_PRIORITY_SETUP, 0);
    return c4iw_ofld_send(&ep->com.dev->rdev, skb);
}

static int close_listsrv_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct cpl_close_listsvr_rpl *rpl = cplhdr(skb);
    struct tid_info *t = dev->rdev.lldi.tids;
    unsigned int stid = GET_TID(rpl);
    struct c4iw_listen_ep *ep = lookup_stid(t, stid);

    PDBG("%s ep %p\n", __func__, ep);
    c4iw_wake_up(&ep->com.wr_wait, status2errno(rpl->status));
    return 0;
}

static void accept_cr(struct c4iw_ep *ep, __be32 peer_ip, struct sk_buff *skb,
              struct cpl_pass_accept_req *req)
{
    struct cpl_pass_accept_rpl *rpl;
    unsigned int mtu_idx;
    u64 opt0;
    u32 opt2;
    int wscale;

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    BUG_ON(skb_cloned(skb));
    skb_trim(skb, sizeof(*rpl));
    skb_get(skb);
    cxgb4_best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx);
    wscale = compute_wscale(rcv_win);
    opt0 = KEEP_ALIVE(1) |
           DELACK(1) |
           WND_SCALE(wscale) |
           MSS_IDX(mtu_idx) |
           L2T_IDX(ep->l2t->idx) |
           TX_CHAN(ep->tx_chan) |
           SMAC_SEL(ep->smac_idx) |
           DSCP(ep->tos) |
           ULP_MODE(ULP_MODE_TCPDDP) |
           RCV_BUFSIZ(rcv_win>>10);
    opt2 = RX_CHANNEL(0) |
           RSS_QUEUE_VALID | RSS_QUEUE(ep->rss_qid);

    if (enable_tcp_timestamps && req->tcpopt.tstamp)
        opt2 |= TSTAMPS_EN(1);
    if (enable_tcp_sack && req->tcpopt.sack)
        opt2 |= SACK_EN(1);
    if (wscale && enable_tcp_window_scaling)
        opt2 |= WND_SCALE_EN(1);

    rpl = cplhdr(skb);
    INIT_TP_WR(rpl, ep->hwtid);
    OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_PASS_ACCEPT_RPL,
                      ep->hwtid));
    rpl->opt0 = cpu_to_be64(opt0);
    rpl->opt2 = cpu_to_be32(opt2);
    set_wr_txq(skb, CPL_PRIORITY_SETUP, ep->ctrlq_idx);
    c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);

    return;
}

static void reject_cr(struct c4iw_dev *dev, u32 hwtid, __be32 peer_ip,
              struct sk_buff *skb)
{
    PDBG("%s c4iw_dev %p tid %u peer_ip %x\n", __func__, dev, hwtid,
         peer_ip);
    BUG_ON(skb_cloned(skb));
    skb_trim(skb, sizeof(struct cpl_tid_release));
    skb_get(skb);
    release_tid(&dev->rdev, hwtid, skb);
    return;
}

static void get_4tuple(struct cpl_pass_accept_req *req,
               __be32 *local_ip, __be32 *peer_ip,
               __be16 *local_port, __be16 *peer_port)
{
    int eth_len = G_ETH_HDR_LEN(be32_to_cpu(req->hdr_len));
    int ip_len = G_IP_HDR_LEN(be32_to_cpu(req->hdr_len));
    struct iphdr *ip = (struct iphdr *)((u8 *)(req + 1) + eth_len);
    struct tcphdr *tcp = (struct tcphdr *)
                 ((u8 *)(req + 1) + eth_len + ip_len);

    PDBG("%s saddr 0x%x daddr 0x%x sport %u dport %u\n", __func__,
         ntohl(ip->saddr), ntohl(ip->daddr), ntohs(tcp->source),
         ntohs(tcp->dest));

    *peer_ip = ip->saddr;
    *local_ip = ip->daddr;
    *peer_port = tcp->source;
    *local_port = tcp->dest;

    return;
}

static int import_ep(struct c4iw_ep *ep, __be32 peer_ip, struct dst_entry *dst,
             struct c4iw_dev *cdev, bool clear_mpa_v1)
{
    struct neighbour *n;
    int err, step;

    n = dst_neigh_lookup(dst, &peer_ip);
    if (!n)
        return -ENODEV;

    rcu_read_lock();
    err = -ENOMEM;
    if (n->dev->flags & IFF_LOOPBACK) {
        struct net_device *pdev;

        pdev = ip_dev_find(&init_net, peer_ip);
        if (!pdev) {
            err = -ENODEV;
            goto out;
        }
        ep->l2t = cxgb4_l2t_get(cdev->rdev.lldi.l2t,
                    n, pdev, 0);
        if (!ep->l2t)
            goto out;
        ep->mtu = pdev->mtu;
        ep->tx_chan = cxgb4_port_chan(pdev);
        ep->smac_idx = (cxgb4_port_viid(pdev) & 0x7F) << 1;
        step = cdev->rdev.lldi.ntxq /
            cdev->rdev.lldi.nchan;
        ep->txq_idx = cxgb4_port_idx(pdev) * step;
        step = cdev->rdev.lldi.nrxq /
            cdev->rdev.lldi.nchan;
        ep->ctrlq_idx = cxgb4_port_idx(pdev);
        ep->rss_qid = cdev->rdev.lldi.rxq_ids[
            cxgb4_port_idx(pdev) * step];
        dev_put(pdev);
    } else {
        ep->l2t = cxgb4_l2t_get(cdev->rdev.lldi.l2t,
                    n, n->dev, 0);
        if (!ep->l2t)
            goto out;
        ep->mtu = dst_mtu(dst);
        ep->tx_chan = cxgb4_port_chan(n->dev);
        ep->smac_idx = (cxgb4_port_viid(n->dev) & 0x7F) << 1;
        step = cdev->rdev.lldi.ntxq /
            cdev->rdev.lldi.nchan;
        ep->txq_idx = cxgb4_port_idx(n->dev) * step;
        ep->ctrlq_idx = cxgb4_port_idx(n->dev);
        step = cdev->rdev.lldi.nrxq /
            cdev->rdev.lldi.nchan;
        ep->rss_qid = cdev->rdev.lldi.rxq_ids[
            cxgb4_port_idx(n->dev) * step];

        if (clear_mpa_v1) {
            ep->retry_with_mpa_v1 = 0;
            ep->tried_with_mpa_v1 = 0;
        }
    }
    err = 0;
out:
    rcu_read_unlock();

    neigh_release(n);

    return err;
}

static int pass_accept_req(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct c4iw_ep *child_ep, *parent_ep;
    struct cpl_pass_accept_req *req = cplhdr(skb);
    unsigned int stid = GET_POPEN_TID(ntohl(req->tos_stid));
    struct tid_info *t = dev->rdev.lldi.tids;
    unsigned int hwtid = GET_TID(req);
    struct dst_entry *dst;
    struct rtable *rt;
    __be32 local_ip, peer_ip;
    __be16 local_port, peer_port;
    int err;

    parent_ep = lookup_stid(t, stid);
    PDBG("%s parent ep %p tid %u\n", __func__, parent_ep, hwtid);

    get_4tuple(req, &local_ip, &peer_ip, &local_port, &peer_port);

    if (state_read(&parent_ep->com) != LISTEN) {
        printk(KERN_ERR "%s - listening ep not in LISTEN\n",
               __func__);
        goto reject;
    }

    /* Find output route */
    rt = find_route(dev, local_ip, peer_ip, local_port, peer_port,
            GET_POPEN_TOS(ntohl(req->tos_stid)));
    if (!rt) {
        printk(KERN_ERR MOD "%s - failed to find dst entry!\n",
               __func__);
        goto reject;
    }
    dst = &rt->dst;

    child_ep = alloc_ep(sizeof(*child_ep), GFP_KERNEL);
    if (!child_ep) {
        printk(KERN_ERR MOD "%s - failed to allocate ep entry!\n",
               __func__);
        dst_release(dst);
        goto reject;
    }

    err = import_ep(child_ep, peer_ip, dst, dev, false);
    if (err) {
        printk(KERN_ERR MOD "%s - failed to allocate l2t entry!\n",
               __func__);
        dst_release(dst);
        kfree(child_ep);
        goto reject;
    }

    state_set(&child_ep->com, CONNECTING);
    child_ep->com.dev = dev;
    child_ep->com.cm_id = NULL;
    child_ep->com.local_addr.sin_family = PF_INET;
    child_ep->com.local_addr.sin_port = local_port;
    child_ep->com.local_addr.sin_addr.s_addr = local_ip;
    child_ep->com.remote_addr.sin_family = PF_INET;
    child_ep->com.remote_addr.sin_port = peer_port;
    child_ep->com.remote_addr.sin_addr.s_addr = peer_ip;
    c4iw_get_ep(&parent_ep->com);
    child_ep->parent_ep = parent_ep;
    child_ep->tos = GET_POPEN_TOS(ntohl(req->tos_stid));
    child_ep->dst = dst;
    child_ep->hwtid = hwtid;

    PDBG("%s tx_chan %u smac_idx %u rss_qid %u\n", __func__,
         child_ep->tx_chan, child_ep->smac_idx, child_ep->rss_qid);

    init_timer(&child_ep->timer);
    cxgb4_insert_tid(t, child_ep, hwtid);
    accept_cr(child_ep, peer_ip, skb, req);
    goto out;
reject:
    reject_cr(dev, hwtid, peer_ip, skb);
out:
    return 0;
}

static int pass_establish(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct c4iw_ep *ep;
    struct cpl_pass_establish *req = cplhdr(skb);
    struct tid_info *t = dev->rdev.lldi.tids;
    unsigned int tid = GET_TID(req);

    ep = lookup_tid(t, tid);
    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    ep->snd_seq = be32_to_cpu(req->snd_isn);
    ep->rcv_seq = be32_to_cpu(req->rcv_isn);

    set_emss(ep, ntohs(req->tcp_opt));

    dst_confirm(ep->dst);
    state_set(&ep->com, MPA_REQ_WAIT);
    start_ep_timer(ep);
    send_flowc(ep, skb);

    return 0;
}

static int peer_close(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct cpl_peer_close *hdr = cplhdr(skb);
    struct c4iw_ep *ep;
    struct c4iw_qp_attributes attrs;
    int disconnect = 1;
    int release = 0;
    struct tid_info *t = dev->rdev.lldi.tids;
    unsigned int tid = GET_TID(hdr);
    int ret;

    ep = lookup_tid(t, tid);
    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    dst_confirm(ep->dst);

    mutex_lock(&ep->com.mutex);
    switch (ep->com.state) {
    case MPA_REQ_WAIT:
        __state_set(&ep->com, CLOSING);
        break;
    case MPA_REQ_SENT:
        __state_set(&ep->com, CLOSING);
        connect_reply_upcall(ep, -ECONNRESET);
        break;
    case MPA_REQ_RCVD:

        /*
         * We're gonna mark this puppy DEAD, but keep
         * the reference on it until the ULP accepts or
         * rejects the CR. Also wake up anyone waiting
         * in rdma connection migration (see c4iw_accept_cr()).
         */
        __state_set(&ep->com, CLOSING);
        PDBG("waking up ep %p tid %u\n", ep, ep->hwtid);
        c4iw_wake_up(&ep->com.wr_wait, -ECONNRESET);
        break;
    case MPA_REP_SENT:
        __state_set(&ep->com, CLOSING);
        PDBG("waking up ep %p tid %u\n", ep, ep->hwtid);
        c4iw_wake_up(&ep->com.wr_wait, -ECONNRESET);
        break;
    case FPDU_MODE:
        start_ep_timer(ep);
        __state_set(&ep->com, CLOSING);
        attrs.next_state = C4IW_QP_STATE_CLOSING;
        ret = c4iw_modify_qp(ep->com.qp->rhp, ep->com.qp,
                       C4IW_QP_ATTR_NEXT_STATE, &attrs, 1);
        if (ret != -ECONNRESET) {
            peer_close_upcall(ep);
            disconnect = 1;
        }
        break;
    case ABORTING:
        disconnect = 0;
        break;
    case CLOSING:
        __state_set(&ep->com, MORIBUND);
        disconnect = 0;
        break;
    case MORIBUND:
        stop_ep_timer(ep);
        if (ep->com.cm_id && ep->com.qp) {
            attrs.next_state = C4IW_QP_STATE_IDLE;
            c4iw_modify_qp(ep->com.qp->rhp, ep->com.qp,
                       C4IW_QP_ATTR_NEXT_STATE, &attrs, 1);
        }
        close_complete_upcall(ep);
        __state_set(&ep->com, DEAD);
        release = 1;
        disconnect = 0;
        break;
    case DEAD:
        disconnect = 0;
        break;
    default:
        BUG_ON(1);
    }
    mutex_unlock(&ep->com.mutex);
    if (disconnect)
        c4iw_ep_disconnect(ep, 0, GFP_KERNEL);
    if (release)
        release_ep_resources(ep);
    return 0;
}

/*
 * Returns whether an ABORT_REQ_RSS message is a negative advice.
 */
static int is_neg_adv_abort(unsigned int status)
{
    return status == CPL_ERR_RTX_NEG_ADVICE ||
           status == CPL_ERR_PERSIST_NEG_ADVICE;
}

static int c4iw_reconnect(struct c4iw_ep *ep)
{
    struct rtable *rt;
    int err = 0;

    PDBG("%s qp %p cm_id %p\n", __func__, ep->com.qp, ep->com.cm_id);
    init_timer(&ep->timer);

    /*
     * Allocate an active TID to initiate a TCP connection.
     */
    ep->atid = cxgb4_alloc_atid(ep->com.dev->rdev.lldi.tids, ep);
    if (ep->atid == -1) {
        printk(KERN_ERR MOD "%s - cannot alloc atid.\n", __func__);
        err = -ENOMEM;
        goto fail2;
    }

    /* find a route */
    rt = find_route(ep->com.dev,
            ep->com.cm_id->local_addr.sin_addr.s_addr,
            ep->com.cm_id->remote_addr.sin_addr.s_addr,
            ep->com.cm_id->local_addr.sin_port,
            ep->com.cm_id->remote_addr.sin_port, 0);
    if (!rt) {
        printk(KERN_ERR MOD "%s - cannot find route.\n", __func__);
        err = -EHOSTUNREACH;
        goto fail3;
    }
    ep->dst = &rt->dst;

    err = import_ep(ep, ep->com.cm_id->remote_addr.sin_addr.s_addr,
            ep->dst, ep->com.dev, false);
    if (err) {
        printk(KERN_ERR MOD "%s - cannot alloc l2e.\n", __func__);
        goto fail4;
    }

    PDBG("%s txq_idx %u tx_chan %u smac_idx %u rss_qid %u l2t_idx %u\n",
         __func__, ep->txq_idx, ep->tx_chan, ep->smac_idx, ep->rss_qid,
         ep->l2t->idx);

    state_set(&ep->com, CONNECTING);
    ep->tos = 0;

    /* send connect request to rnic */
    err = send_connect(ep);
    if (!err)
        goto out;

    cxgb4_l2t_release(ep->l2t);
fail4:
    dst_release(ep->dst);
fail3:
    cxgb4_free_atid(ep->com.dev->rdev.lldi.tids, ep->atid);
fail2:
    /*
     * remember to send notification to upper layer.
     * We are in here so the upper layer is not aware that this is
     * re-connect attempt and so, upper layer is still waiting for
     * response of 1st connect request.
     */
    connect_reply_upcall(ep, -ECONNRESET);
    c4iw_put_ep(&ep->com);
out:
    return err;
}

static int peer_abort(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct cpl_abort_req_rss *req = cplhdr(skb);
    struct c4iw_ep *ep;
    struct cpl_abort_rpl *rpl;
    struct sk_buff *rpl_skb;
    struct c4iw_qp_attributes attrs;
    int ret;
    int release = 0;
    struct tid_info *t = dev->rdev.lldi.tids;
    unsigned int tid = GET_TID(req);

    ep = lookup_tid(t, tid);
    if (is_neg_adv_abort(req->status)) {
        PDBG("%s neg_adv_abort ep %p tid %u\n", __func__, ep,
             ep->hwtid);
        return 0;
    }
    PDBG("%s ep %p tid %u state %u\n", __func__, ep, ep->hwtid,
         ep->com.state);

    /*
     * Wake up any threads in rdma_init() or rdma_fini().
     * However, this is not needed if com state is just
     * MPA_REQ_SENT
     */
    if (ep->com.state != MPA_REQ_SENT)
        c4iw_wake_up(&ep->com.wr_wait, -ECONNRESET);

    mutex_lock(&ep->com.mutex);
    switch (ep->com.state) {
    case CONNECTING:
        break;
    case MPA_REQ_WAIT:
        stop_ep_timer(ep);
        break;
    case MPA_REQ_SENT:
        stop_ep_timer(ep);
        if (mpa_rev == 2 && ep->tried_with_mpa_v1)
            connect_reply_upcall(ep, -ECONNRESET);
        else {
            /*
             * we just don't send notification upwards because we
             * want to retry with mpa_v1 without upper layers even
             * knowing it.
             *
             * do some housekeeping so as to re-initiate the
             * connection
             */
            PDBG("%s: mpa_rev=%d. Retrying with mpav1\n", __func__,
                 mpa_rev);
            ep->retry_with_mpa_v1 = 1;
        }
        break;
    case MPA_REP_SENT:
        break;
    case MPA_REQ_RCVD:
        break;
    case MORIBUND:
    case CLOSING:
        stop_ep_timer(ep);
        /*FALLTHROUGH*/
    case FPDU_MODE:
        if (ep->com.cm_id && ep->com.qp) {
            attrs.next_state = C4IW_QP_STATE_ERROR;
            ret = c4iw_modify_qp(ep->com.qp->rhp,
                     ep->com.qp, C4IW_QP_ATTR_NEXT_STATE,
                     &attrs, 1);
            if (ret)
                printk(KERN_ERR MOD
                       "%s - qp <- error failed!\n",
                       __func__);
        }
        peer_abort_upcall(ep);
        break;
    case ABORTING:
        break;
    case DEAD:
        PDBG("%s PEER_ABORT IN DEAD STATE!!!!\n", __func__);
        mutex_unlock(&ep->com.mutex);
        return 0;
    default:
        BUG_ON(1);
        break;
    }
    dst_confirm(ep->dst);
    if (ep->com.state != ABORTING) {
        __state_set(&ep->com, DEAD);
        /* we don't release if we want to retry with mpa_v1 */
        if (!ep->retry_with_mpa_v1)
            release = 1;
    }
    mutex_unlock(&ep->com.mutex);

    rpl_skb = get_skb(skb, sizeof(*rpl), GFP_KERNEL);
    if (!rpl_skb) {
        printk(KERN_ERR MOD "%s - cannot allocate skb!\n",
               __func__);
        release = 1;
        goto out;
    }
    set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx);
    rpl = (struct cpl_abort_rpl *) skb_put(rpl_skb, sizeof(*rpl));
    INIT_TP_WR(rpl, ep->hwtid);
    OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, ep->hwtid));
    rpl->cmd = CPL_ABORT_NO_RST;
    c4iw_ofld_send(&ep->com.dev->rdev, rpl_skb);
out:
    if (release)
        release_ep_resources(ep);

    /* retry with mpa-v1 */
    if (ep && ep->retry_with_mpa_v1) {
        cxgb4_remove_tid(ep->com.dev->rdev.lldi.tids, 0, ep->hwtid);
        dst_release(ep->dst);
        cxgb4_l2t_release(ep->l2t);
        c4iw_reconnect(ep);
    }

    return 0;
}

static int close_con_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct c4iw_ep *ep;
    struct c4iw_qp_attributes attrs;
    struct cpl_close_con_rpl *rpl = cplhdr(skb);
    int release = 0;
    struct tid_info *t = dev->rdev.lldi.tids;
    unsigned int tid = GET_TID(rpl);

    ep = lookup_tid(t, tid);

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    BUG_ON(!ep);

    /* The cm_id may be null if we failed to connect */
    mutex_lock(&ep->com.mutex);
    switch (ep->com.state) {
    case CLOSING:
        __state_set(&ep->com, MORIBUND);
        break;
    case MORIBUND:
        stop_ep_timer(ep);
        if ((ep->com.cm_id) && (ep->com.qp)) {
            attrs.next_state = C4IW_QP_STATE_IDLE;
            c4iw_modify_qp(ep->com.qp->rhp,
                         ep->com.qp,
                         C4IW_QP_ATTR_NEXT_STATE,
                         &attrs, 1);
        }
        close_complete_upcall(ep);
        __state_set(&ep->com, DEAD);
        release = 1;
        break;
    case ABORTING:
    case DEAD:
        break;
    default:
        BUG_ON(1);
        break;
    }
    mutex_unlock(&ep->com.mutex);
    if (release)
        release_ep_resources(ep);
    return 0;
}

static int terminate(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct cpl_rdma_terminate *rpl = cplhdr(skb);
    struct tid_info *t = dev->rdev.lldi.tids;
    unsigned int tid = GET_TID(rpl);
    struct c4iw_ep *ep;
    struct c4iw_qp_attributes attrs;

    ep = lookup_tid(t, tid);
    BUG_ON(!ep);

    if (ep && ep->com.qp) {
        printk(KERN_WARNING MOD "TERM received tid %u qpid %u\n", tid,
               ep->com.qp->wq.sq.qid);
        attrs.next_state = C4IW_QP_STATE_TERMINATE;
        c4iw_modify_qp(ep->com.qp->rhp, ep->com.qp,
                   C4IW_QP_ATTR_NEXT_STATE, &attrs, 1);
    } else
        printk(KERN_WARNING MOD "TERM received tid %u no ep/qp\n", tid);

    return 0;
}

/*
 * Upcall from the adapter indicating data has been transmitted.
 * For us its just the single MPA request or reply.  We can now free
 * the skb holding the mpa message.
 */
static int fw4_ack(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct c4iw_ep *ep;
    struct cpl_fw4_ack *hdr = cplhdr(skb);
    u8 credits = hdr->credits;
    unsigned int tid = GET_TID(hdr);
    struct tid_info *t = dev->rdev.lldi.tids;


    ep = lookup_tid(t, tid);
    PDBG("%s ep %p tid %u credits %u\n", __func__, ep, ep->hwtid, credits);
    if (credits == 0) {
        PDBG("%s 0 credit ack ep %p tid %u state %u\n",
             __func__, ep, ep->hwtid, state_read(&ep->com));
        return 0;
    }

    dst_confirm(ep->dst);
    if (ep->mpa_skb) {
        PDBG("%s last streaming msg ack ep %p tid %u state %u "
             "initiator %u freeing skb\n", __func__, ep, ep->hwtid,
             state_read(&ep->com), ep->mpa_attr.initiator ? 1 : 0);
        kfree_skb(ep->mpa_skb);
        ep->mpa_skb = NULL;
    }
    return 0;
}

int c4iw_reject_cr(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
{
    int err;
    struct c4iw_ep *ep = to_ep(cm_id);
    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);

    if (state_read(&ep->com) == DEAD) {
        c4iw_put_ep(&ep->com);
        return -ECONNRESET;
    }
    BUG_ON(state_read(&ep->com) != MPA_REQ_RCVD);
    if (mpa_rev == 0)
        abort_connection(ep, NULL, GFP_KERNEL);
    else {
        err = send_mpa_reject(ep, pdata, pdata_len);
        err = c4iw_ep_disconnect(ep, 0, GFP_KERNEL);
    }
    c4iw_put_ep(&ep->com);
    return 0;
}

int c4iw_accept_cr(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
{
    int err;
    struct c4iw_qp_attributes attrs;
    enum c4iw_qp_attr_mask mask;
    struct c4iw_ep *ep = to_ep(cm_id);
    struct c4iw_dev *h = to_c4iw_dev(cm_id->device);
    struct c4iw_qp *qp = get_qhp(h, conn_param->qpn);

    PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
    if (state_read(&ep->com) == DEAD) {
        err = -ECONNRESET;
        goto err;
    }

    BUG_ON(state_read(&ep->com) != MPA_REQ_RCVD);
    BUG_ON(!qp);

    if ((conn_param->ord > c4iw_max_read_depth) ||
        (conn_param->ird > c4iw_max_read_depth)) {
        abort_connection(ep, NULL, GFP_KERNEL);
        err = -EINVAL;
        goto err;
    }

    if (ep->mpa_attr.version == 2 && ep->mpa_attr.enhanced_rdma_conn) {
        if (conn_param->ord > ep->ird) {
            ep->ird = conn_param->ird;
            ep->ord = conn_param->ord;
            send_mpa_reject(ep, conn_param->private_data,
                    conn_param->private_data_len);
            abort_connection(ep, NULL, GFP_KERNEL);
            err = -ENOMEM;
            goto err;
        }
        if (conn_param->ird > ep->ord) {
            if (!ep->ord)
                conn_param->ird = 1;
            else {
                abort_connection(ep, NULL, GFP_KERNEL);
                err = -ENOMEM;
                goto err;
            }
        }

    }
    ep->ird = conn_param->ird;
    ep->ord = conn_param->ord;

    if (ep->mpa_attr.version != 2)
        if (peer2peer && ep->ird == 0)
            ep->ird = 1;

    PDBG("%s %d ird %d ord %d\n", __func__, __LINE__, ep->ird, ep->ord);

    cm_id->add_ref(cm_id);
    ep->com.cm_id = cm_id;
    ep->com.qp = qp;

    /* bind QP to EP and move to RTS */
    attrs.mpa_attr = ep->mpa_attr;
    attrs.max_ird = ep->ird;
    attrs.max_ord = ep->ord;
    attrs.llp_stream_handle = ep;
    attrs.next_state = C4IW_QP_STATE_RTS;

    /* bind QP and TID with INIT_WR */
    mask = C4IW_QP_ATTR_NEXT_STATE |
                 C4IW_QP_ATTR_LLP_STREAM_HANDLE |
                 C4IW_QP_ATTR_MPA_ATTR |
                 C4IW_QP_ATTR_MAX_IRD |
                 C4IW_QP_ATTR_MAX_ORD;

    err = c4iw_modify_qp(ep->com.qp->rhp,
                 ep->com.qp, mask, &attrs, 1);
    if (err)
        goto err1;
    err = send_mpa_reply(ep, conn_param->private_data,
                 conn_param->private_data_len);
    if (err)
        goto err1;

    state_set(&ep->com, FPDU_MODE);
    established_upcall(ep);
    c4iw_put_ep(&ep->com);
    return 0;
err1:
    ep->com.cm_id = NULL;
    ep->com.qp = NULL;
    cm_id->rem_ref(cm_id);
err:
    c4iw_put_ep(&ep->com);
    return err;
}

int c4iw_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
{
    struct c4iw_dev *dev = to_c4iw_dev(cm_id->device);
    struct c4iw_ep *ep;
    struct rtable *rt;
    int err = 0;

    if ((conn_param->ord > c4iw_max_read_depth) ||
        (conn_param->ird > c4iw_max_read_depth)) {
        err = -EINVAL;
        goto out;
    }
    ep = alloc_ep(sizeof(*ep), GFP_KERNEL);
    if (!ep) {
        printk(KERN_ERR MOD "%s - cannot alloc ep.\n", __func__);
        err = -ENOMEM;
        goto out;
    }
    init_timer(&ep->timer);
    ep->plen = conn_param->private_data_len;
    if (ep->plen)
        memcpy(ep->mpa_pkt + sizeof(struct mpa_message),
               conn_param->private_data, ep->plen);
    ep->ird = conn_param->ird;
    ep->ord = conn_param->ord;

    if (peer2peer && ep->ord == 0)
        ep->ord = 1;

    cm_id->add_ref(cm_id);
    ep->com.dev = dev;
    ep->com.cm_id = cm_id;
    ep->com.qp = get_qhp(dev, conn_param->qpn);
    BUG_ON(!ep->com.qp);
    PDBG("%s qpn 0x%x qp %p cm_id %p\n", __func__, conn_param->qpn,
         ep->com.qp, cm_id);

    /*
     * Allocate an active TID to initiate a TCP connection.
     */
    ep->atid = cxgb4_alloc_atid(dev->rdev.lldi.tids, ep);
    if (ep->atid == -1) {
        printk(KERN_ERR MOD "%s - cannot alloc atid.\n", __func__);
        err = -ENOMEM;
        goto fail2;
    }

    PDBG("%s saddr 0x%x sport 0x%x raddr 0x%x rport 0x%x\n", __func__,
         ntohl(cm_id->local_addr.sin_addr.s_addr),
         ntohs(cm_id->local_addr.sin_port),
         ntohl(cm_id->remote_addr.sin_addr.s_addr),
         ntohs(cm_id->remote_addr.sin_port));

    /* find a route */
    rt = find_route(dev,
            cm_id->local_addr.sin_addr.s_addr,
            cm_id->remote_addr.sin_addr.s_addr,
            cm_id->local_addr.sin_port,
            cm_id->remote_addr.sin_port, 0);
    if (!rt) {
        printk(KERN_ERR MOD "%s - cannot find route.\n", __func__);
        err = -EHOSTUNREACH;
        goto fail3;
    }
    ep->dst = &rt->dst;

    err = import_ep(ep, cm_id->remote_addr.sin_addr.s_addr,
            ep->dst, ep->com.dev, true);
    if (err) {
        printk(KERN_ERR MOD "%s - cannot alloc l2e.\n", __func__);
        goto fail4;
    }

    PDBG("%s txq_idx %u tx_chan %u smac_idx %u rss_qid %u l2t_idx %u\n",
        __func__, ep->txq_idx, ep->tx_chan, ep->smac_idx, ep->rss_qid,
        ep->l2t->idx);

    state_set(&ep->com, CONNECTING);
    ep->tos = 0;
    ep->com.local_addr = cm_id->local_addr;
    ep->com.remote_addr = cm_id->remote_addr;

    /* send connect request to rnic */
    err = send_connect(ep);
    if (!err)
        goto out;

    cxgb4_l2t_release(ep->l2t);
fail4:
    dst_release(ep->dst);
fail3:
    cxgb4_free_atid(ep->com.dev->rdev.lldi.tids, ep->atid);
fail2:
    cm_id->rem_ref(cm_id);
    c4iw_put_ep(&ep->com);
out:
    return err;
}

int c4iw_create_listen(struct iw_cm_id *cm_id, int backlog)
{
    int err = 0;
    struct c4iw_dev *dev = to_c4iw_dev(cm_id->device);
    struct c4iw_listen_ep *ep;


    might_sleep();

    ep = alloc_ep(sizeof(*ep), GFP_KERNEL);
    if (!ep) {
        printk(KERN_ERR MOD "%s - cannot alloc ep.\n", __func__);
        err = -ENOMEM;
        goto fail1;
    }
    PDBG("%s ep %p\n", __func__, ep);
    cm_id->add_ref(cm_id);
    ep->com.cm_id = cm_id;
    ep->com.dev = dev;
    ep->backlog = backlog;
    ep->com.local_addr = cm_id->local_addr;

    /*
     * Allocate a server TID.
     */
    ep->stid = cxgb4_alloc_stid(dev->rdev.lldi.tids, PF_INET, ep);
    if (ep->stid == -1) {
        printk(KERN_ERR MOD "%s - cannot alloc stid.\n", __func__);
        err = -ENOMEM;
        goto fail2;
    }

    state_set(&ep->com, LISTEN);
    c4iw_init_wr_wait(&ep->com.wr_wait);
    err = cxgb4_create_server(ep->com.dev->rdev.lldi.ports[0], ep->stid,
                  ep->com.local_addr.sin_addr.s_addr,
                  ep->com.local_addr.sin_port,
                  ep->com.dev->rdev.lldi.rxq_ids[0]);
    if (err)
        goto fail3;

    /* wait for pass_open_rpl */
    err = c4iw_wait_for_reply(&ep->com.dev->rdev, &ep->com.wr_wait, 0, 0,
                  __func__);
    if (!err) {
        cm_id->provider_data = ep;
        goto out;
    }
fail3:
    cxgb4_free_stid(ep->com.dev->rdev.lldi.tids, ep->stid, PF_INET);
fail2:
    cm_id->rem_ref(cm_id);
    c4iw_put_ep(&ep->com);
fail1:
out:
    return err;
}

int c4iw_destroy_listen(struct iw_cm_id *cm_id)
{
    int err;
    struct c4iw_listen_ep *ep = to_listen_ep(cm_id);

    PDBG("%s ep %p\n", __func__, ep);

    might_sleep();
    state_set(&ep->com, DEAD);
    c4iw_init_wr_wait(&ep->com.wr_wait);
    err = listen_stop(ep);
    if (err)
        goto done;
    err = c4iw_wait_for_reply(&ep->com.dev->rdev, &ep->com.wr_wait, 0, 0,
                  __func__);
    cxgb4_free_stid(ep->com.dev->rdev.lldi.tids, ep->stid, PF_INET);
done:
    cm_id->rem_ref(cm_id);
    c4iw_put_ep(&ep->com);
    return err;
}

int c4iw_ep_disconnect(struct c4iw_ep *ep, int abrupt, gfp_t gfp)
{
    int ret = 0;
    int close = 0;
    int fatal = 0;
    struct c4iw_rdev *rdev;

    mutex_lock(&ep->com.mutex);

    PDBG("%s ep %p state %s, abrupt %d\n", __func__, ep,
         states[ep->com.state], abrupt);

    rdev = &ep->com.dev->rdev;
    if (c4iw_fatal_error(rdev)) {
        fatal = 1;
        close_complete_upcall(ep);
        ep->com.state = DEAD;
    }
    switch (ep->com.state) {
    case MPA_REQ_WAIT:
    case MPA_REQ_SENT:
    case MPA_REQ_RCVD:
    case MPA_REP_SENT:
    case FPDU_MODE:
        close = 1;
        if (abrupt)
            ep->com.state = ABORTING;
        else {
            ep->com.state = CLOSING;
            start_ep_timer(ep);
        }
        set_bit(CLOSE_SENT, &ep->com.flags);
        break;
    case CLOSING:
        if (!test_and_set_bit(CLOSE_SENT, &ep->com.flags)) {
            close = 1;
            if (abrupt) {
                stop_ep_timer(ep);
                ep->com.state = ABORTING;
            } else
                ep->com.state = MORIBUND;
        }
        break;
    case MORIBUND:
    case ABORTING:
    case DEAD:
        PDBG("%s ignoring disconnect ep %p state %u\n",
             __func__, ep, ep->com.state);
        break;
    default:
        BUG();
        break;
    }

    if (close) {
        if (abrupt) {
            close_complete_upcall(ep);
            ret = send_abort(ep, NULL, gfp);
        } else
            ret = send_halfclose(ep, gfp);
        if (ret)
            fatal = 1;
    }
    mutex_unlock(&ep->com.mutex);
    if (fatal)
        release_ep_resources(ep);
    return ret;
}

static int async_event(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct cpl_fw6_msg *rpl = cplhdr(skb);
    c4iw_ev_dispatch(dev, (struct t4_cqe *)&rpl->data[0]);
    return 0;
}

/*
 * These are the real handlers that are called from a
 * work queue.
 */
static c4iw_handler_func work_handlers[NUM_CPL_CMDS] = {
    [CPL_ACT_ESTABLISH] = act_establish,
    [CPL_ACT_OPEN_RPL] = act_open_rpl,
    [CPL_RX_DATA] = rx_data,
    [CPL_ABORT_RPL_RSS] = abort_rpl,
    [CPL_ABORT_RPL] = abort_rpl,
    [CPL_PASS_OPEN_RPL] = pass_open_rpl,
    [CPL_CLOSE_LISTSRV_RPL] = close_listsrv_rpl,
    [CPL_PASS_ACCEPT_REQ] = pass_accept_req,
    [CPL_PASS_ESTABLISH] = pass_establish,
    [CPL_PEER_CLOSE] = peer_close,
    [CPL_ABORT_REQ_RSS] = peer_abort,
    [CPL_CLOSE_CON_RPL] = close_con_rpl,
    [CPL_RDMA_TERMINATE] = terminate,
    [CPL_FW4_ACK] = fw4_ack,
    [CPL_FW6_MSG] = async_event
};

static void process_timeout(struct c4iw_ep *ep)
{
    struct c4iw_qp_attributes attrs;
    int abort = 1;

    mutex_lock(&ep->com.mutex);
    PDBG("%s ep %p tid %u state %d\n", __func__, ep, ep->hwtid,
         ep->com.state);
    switch (ep->com.state) {
    case MPA_REQ_SENT:
        __state_set(&ep->com, ABORTING);
        connect_reply_upcall(ep, -ETIMEDOUT);
        break;
    case MPA_REQ_WAIT:
        __state_set(&ep->com, ABORTING);
        break;
    case CLOSING:
    case MORIBUND:
        if (ep->com.cm_id && ep->com.qp) {
            attrs.next_state = C4IW_QP_STATE_ERROR;
            c4iw_modify_qp(ep->com.qp->rhp,
                     ep->com.qp, C4IW_QP_ATTR_NEXT_STATE,
                     &attrs, 1);
        }
        __state_set(&ep->com, ABORTING);
        break;
    default:
        printk(KERN_ERR "%s unexpected state ep %p tid %u state %u\n",
            __func__, ep, ep->hwtid, ep->com.state);
        WARN_ON(1);
        abort = 0;
    }
    mutex_unlock(&ep->com.mutex);
    if (abort)
        abort_connection(ep, NULL, GFP_KERNEL);
    c4iw_put_ep(&ep->com);
}

static void process_timedout_eps(void)
{
    struct c4iw_ep *ep;

    spin_lock_irq(&timeout_lock);
    while (!list_empty(&timeout_list)) {
        struct list_head *tmp;

        tmp = timeout_list.next;
        list_del(tmp);
        spin_unlock_irq(&timeout_lock);
        ep = list_entry(tmp, struct c4iw_ep, entry);
        process_timeout(ep);
        spin_lock_irq(&timeout_lock);
    }
    spin_unlock_irq(&timeout_lock);
}

static void process_work(struct work_struct *work)
{
    struct sk_buff *skb = NULL;
    struct c4iw_dev *dev;
    struct cpl_act_establish *rpl;
    unsigned int opcode;
    int ret;

    while ((skb = skb_dequeue(&rxq))) {
        rpl = cplhdr(skb);
        dev = *((struct c4iw_dev **) (skb->cb + sizeof(void *)));
        opcode = rpl->ot.opcode;

        BUG_ON(!work_handlers[opcode]);
        ret = work_handlers[opcode](dev, skb);
        if (!ret)
            kfree_skb(skb);
    }
    process_timedout_eps();
}

static DECLARE_WORK(skb_work, process_work);

static void ep_timeout(unsigned long arg)
{
    struct c4iw_ep *ep = (struct c4iw_ep *)arg;

    spin_lock(&timeout_lock);
    list_add_tail(&ep->entry, &timeout_list);
    spin_unlock(&timeout_lock);
    queue_work(workq, &skb_work);
}

/*
 * All the CM events are handled on a work queue to have a safe context.
 */
static int sched(struct c4iw_dev *dev, struct sk_buff *skb)
{

    /*
     * Save dev in the skb->cb area.
     */
    *((struct c4iw_dev **) (skb->cb + sizeof(void *))) = dev;

    /*
     * Queue the skb and schedule the worker thread.
     */
    skb_queue_tail(&rxq, skb);
    queue_work(workq, &skb_work);
    return 0;
}

static int set_tcb_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct cpl_set_tcb_rpl *rpl = cplhdr(skb);

    if (rpl->status != CPL_ERR_NONE) {
        printk(KERN_ERR MOD "Unexpected SET_TCB_RPL status %u "
               "for tid %u\n", rpl->status, GET_TID(rpl));
    }
    kfree_skb(skb);
    return 0;
}

static int fw6_msg(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct cpl_fw6_msg *rpl = cplhdr(skb);
    struct c4iw_wr_wait *wr_waitp;
    int ret;

    PDBG("%s type %u\n", __func__, rpl->type);

    switch (rpl->type) {
    case 1:
        ret = (int)((be64_to_cpu(rpl->data[0]) >> 8) & 0xff);
        wr_waitp = (struct c4iw_wr_wait *)(__force unsigned long) rpl->data[1];
        PDBG("%s wr_waitp %p ret %u\n", __func__, wr_waitp, ret);
        if (wr_waitp)
            c4iw_wake_up(wr_waitp, ret ? -ret : 0);
        kfree_skb(skb);
        break;
    case 2:
        sched(dev, skb);
        break;
    default:
        printk(KERN_ERR MOD "%s unexpected fw6 msg type %u\n", __func__,
               rpl->type);
        kfree_skb(skb);
        break;
    }
    return 0;
}

static int peer_abort_intr(struct c4iw_dev *dev, struct sk_buff *skb)
{
    struct cpl_abort_req_rss *req = cplhdr(skb);
    struct c4iw_ep *ep;
    struct tid_info *t = dev->rdev.lldi.tids;
    unsigned int tid = GET_TID(req);

    ep = lookup_tid(t, tid);
    if (!ep) {
        printk(KERN_WARNING MOD
               "Abort on non-existent endpoint, tid %d\n", tid);
        kfree_skb(skb);
        return 0;
    }
    if (is_neg_adv_abort(req->status)) {
        PDBG("%s neg_adv_abort ep %p tid %u\n", __func__, ep,
             ep->hwtid);
        kfree_skb(skb);
        return 0;
    }
    PDBG("%s ep %p tid %u state %u\n", __func__, ep, ep->hwtid,
         ep->com.state);

    /*
     * Wake up any threads in rdma_init() or rdma_fini().
     */
    c4iw_wake_up(&ep->com.wr_wait, -ECONNRESET);
    sched(dev, skb);
    return 0;
}

/*
 * Most upcalls from the T4 Core go to sched() to
 * schedule the processing on a work queue.
 */
c4iw_handler_func c4iw_handlers[NUM_CPL_CMDS] = {
    [CPL_ACT_ESTABLISH] = sched,
    [CPL_ACT_OPEN_RPL] = sched,
    [CPL_RX_DATA] = sched,
    [CPL_ABORT_RPL_RSS] = sched,
    [CPL_ABORT_RPL] = sched,
    [CPL_PASS_OPEN_RPL] = sched,
    [CPL_CLOSE_LISTSRV_RPL] = sched,
    [CPL_PASS_ACCEPT_REQ] = sched,
    [CPL_PASS_ESTABLISH] = sched,
    [CPL_PEER_CLOSE] = sched,
    [CPL_CLOSE_CON_RPL] = sched,
    [CPL_ABORT_REQ_RSS] = peer_abort_intr,
    [CPL_RDMA_TERMINATE] = sched,
    [CPL_FW4_ACK] = sched,
    [CPL_SET_TCB_RPL] = set_tcb_rpl,
    [CPL_FW6_MSG] = fw6_msg
};

int __init c4iw_cm_init(void)
{
    spin_lock_init(&timeout_lock);
    skb_queue_head_init(&rxq);

    workq = create_singlethread_workqueue("iw_cxgb4");
    if (!workq)
        return -ENOMEM;

    return 0;
}

void __exit c4iw_cm_term(void)
{
    WARN_ON(!list_empty(&timeout_list));
    flush_workqueue(workq);
    destroy_workqueue(workq);
}