iwch_cm.c

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/*
 * Copyright (c) 2006 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/slab.h>
#include <linux/workqueue.h>
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/notifier.h>
#include <linux/inetdevice.h>

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

#include "tcb.h"
#include "cxgb3_offload.h"
#include "iwch.h"
#include "iwch_provider.h"
#include "iwch_cm.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,
};

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

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 spec compliant. (default=1)");

static int markers_enabled = 0;
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=256)");

static int snd_win = 32 * 1024;
module_param(snd_win, int, 0644);
MODULE_PARM_DESC(snd_win, "TCP send window in bytes (default=32KB)");

static unsigned int nocong = 0;
module_param(nocong, uint, 0644);
MODULE_PARM_DESC(nocong, "Turn off congestion control (default=0)");

static unsigned int cong_flavor = 1;
module_param(cong_flavor, uint, 0644);
MODULE_PARM_DESC(cong_flavor, "TCP Congestion control flavor (default=1)");

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 iwch_ep *ep, int status);

static void start_ep_timer(struct iwch_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
        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 iwch_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);
    put_ep(&ep->com);
}

static int iwch_l2t_send(struct t3cdev *tdev, struct sk_buff *skb, struct l2t_entry *l2e)
{
    int error = 0;
    struct cxio_rdev *rdev;

    rdev = (struct cxio_rdev *)tdev->ulp;
    if (cxio_fatal_error(rdev)) {
        kfree_skb(skb);
        return -EIO;
    }
    error = l2t_send(tdev, skb, l2e);
    if (error < 0)
        kfree_skb(skb);
    return error;
}

int iwch_cxgb3_ofld_send(struct t3cdev *tdev, struct sk_buff *skb)
{
    int error = 0;
    struct cxio_rdev *rdev;

    rdev = (struct cxio_rdev *)tdev->ulp;
    if (cxio_fatal_error(rdev)) {
        kfree_skb(skb);
        return -EIO;
    }
    error = cxgb3_ofld_send(tdev, skb);
    if (error < 0)
        kfree_skb(skb);
    return error;
}

static void release_tid(struct t3cdev *tdev, 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));
    req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
    OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_TID_RELEASE, hwtid));
    skb->priority = CPL_PRIORITY_SETUP;
    iwch_cxgb3_ofld_send(tdev, skb);
    return;
}

int iwch_quiesce_tid(struct iwch_ep *ep)
{
    struct cpl_set_tcb_field *req;
    struct sk_buff *skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);

    if (!skb)
        return -ENOMEM;
    req = (struct cpl_set_tcb_field *) skb_put(skb, sizeof(*req));
    req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
    req->wr.wr_lo = htonl(V_WR_TID(ep->hwtid));
    OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, ep->hwtid));
    req->reply = 0;
    req->cpu_idx = 0;
    req->word = htons(W_TCB_RX_QUIESCE);
    req->mask = cpu_to_be64(1ULL << S_TCB_RX_QUIESCE);
    req->val = cpu_to_be64(1 << S_TCB_RX_QUIESCE);

    skb->priority = CPL_PRIORITY_DATA;
    return iwch_cxgb3_ofld_send(ep->com.tdev, skb);
}

int iwch_resume_tid(struct iwch_ep *ep)
{
    struct cpl_set_tcb_field *req;
    struct sk_buff *skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);

    if (!skb)
        return -ENOMEM;
    req = (struct cpl_set_tcb_field *) skb_put(skb, sizeof(*req));
    req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
    req->wr.wr_lo = htonl(V_WR_TID(ep->hwtid));
    OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, ep->hwtid));
    req->reply = 0;
    req->cpu_idx = 0;
    req->word = htons(W_TCB_RX_QUIESCE);
    req->mask = cpu_to_be64(1ULL << S_TCB_RX_QUIESCE);
    req->val = 0;

    skb->priority = CPL_PRIORITY_DATA;
    return iwch_cxgb3_ofld_send(ep->com.tdev, skb);
}

static void set_emss(struct iwch_ep *ep, u16 opt)
{
    PDBG("%s ep %p opt %u\n", __func__, ep, opt);
    ep->emss = T3C_DATA(ep->com.tdev)->mtus[G_TCPOPT_MSS(opt)] - 40;
    if (G_TCPOPT_TSTAMP(opt))
        ep->emss -= 12;
    if (ep->emss < 128)
        ep->emss = 128;
    PDBG("emss=%d\n", ep->emss);
}

static enum iwch_ep_state state_read(struct iwch_ep_common *epc)
{
    unsigned long flags;
    enum iwch_ep_state state;

    spin_lock_irqsave(&epc->lock, flags);
    state = epc->state;
    spin_unlock_irqrestore(&epc->lock, flags);
    return state;
}

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

static void state_set(struct iwch_ep_common *epc, enum iwch_ep_state new)
{
    unsigned long flags;

    spin_lock_irqsave(&epc->lock, flags);
    PDBG("%s - %s -> %s\n", __func__, states[epc->state], states[new]);
    __state_set(epc, new);
    spin_unlock_irqrestore(&epc->lock, flags);
    return;
}

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

    epc = kzalloc(size, gfp);
    if (epc) {
        kref_init(&epc->kref);
        spin_lock_init(&epc->lock);
        init_waitqueue_head(&epc->waitq);
    }
    PDBG("%s alloc ep %p\n", __func__, epc);
    return epc;
}

void __free_ep(struct kref *kref)
{
    struct iwch_ep *ep;
    ep = container_of(container_of(kref, struct iwch_ep_common, kref),
              struct iwch_ep, com);
    PDBG("%s ep %p state %s\n", __func__, ep, states[state_read(&ep->com)]);
    if (test_bit(RELEASE_RESOURCES, &ep->com.flags)) {
        cxgb3_remove_tid(ep->com.tdev, (void *)ep, ep->hwtid);
        dst_release(ep->dst);
        l2t_release(ep->com.tdev, ep->l2t);
    }
    kfree(ep);
}

static void release_ep_resources(struct iwch_ep *ep)
{
    PDBG("%s ep %p tid %d\n", __func__, ep, ep->hwtid);
    set_bit(RELEASE_RESOURCES, &ep->com.flags);
    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);
    } else {
        skb = alloc_skb(len, gfp);
    }
    return skb;
}

static struct rtable *find_route(struct t3cdev *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 unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu)
{
    int i = 0;

    while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu)
        ++i;
    return i;
}

static void arp_failure_discard(struct t3cdev *dev, struct sk_buff *skb)
{
    PDBG("%s t3cdev %p\n", __func__, dev);
    kfree_skb(skb);
}

/*
 * Handle an ARP failure for an active open.
 */
static void act_open_req_arp_failure(struct t3cdev *dev, 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(struct t3cdev *dev, struct sk_buff *skb)
{
    struct cpl_abort_req *req = cplhdr(skb);

    PDBG("%s t3cdev %p\n", __func__, dev);
    req->cmd = CPL_ABORT_NO_RST;
    iwch_cxgb3_ofld_send(dev, skb);
}

static int send_halfclose(struct iwch_ep *ep, gfp_t gfp)
{
    struct cpl_close_con_req *req;
    struct sk_buff *skb;

    PDBG("%s ep %p\n", __func__, ep);
    skb = get_skb(NULL, sizeof(*req), gfp);
    if (!skb) {
        printk(KERN_ERR MOD "%s - failed to alloc skb\n", __func__);
        return -ENOMEM;
    }
    skb->priority = CPL_PRIORITY_DATA;
    set_arp_failure_handler(skb, arp_failure_discard);
    req = (struct cpl_close_con_req *) skb_put(skb, sizeof(*req));
    req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
    req->wr.wr_lo = htonl(V_WR_TID(ep->hwtid));
    OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, ep->hwtid));
    return iwch_l2t_send(ep->com.tdev, skb, ep->l2t);
}

static int send_abort(struct iwch_ep *ep, struct sk_buff *skb, gfp_t gfp)
{
    struct cpl_abort_req *req;

    PDBG("%s ep %p\n", __func__, ep);
    skb = get_skb(skb, sizeof(*req), gfp);
    if (!skb) {
        printk(KERN_ERR MOD "%s - failed to alloc skb.\n",
               __func__);
        return -ENOMEM;
    }
    skb->priority = CPL_PRIORITY_DATA;
    set_arp_failure_handler(skb, abort_arp_failure);
    req = (struct cpl_abort_req *) skb_put(skb, sizeof(*req));
    req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
    req->wr.wr_lo = htonl(V_WR_TID(ep->hwtid));
    OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, ep->hwtid));
    req->cmd = CPL_ABORT_SEND_RST;
    return iwch_l2t_send(ep->com.tdev, skb, ep->l2t);
}

static int send_connect(struct iwch_ep *ep)
{
    struct cpl_act_open_req *req;
    struct sk_buff *skb;
    u32 opt0h, opt0l, opt2;
    unsigned int mtu_idx;
    int wscale;

    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;
    }
    mtu_idx = find_best_mtu(T3C_DATA(ep->com.tdev), dst_mtu(ep->dst));
    wscale = compute_wscale(rcv_win);
    opt0h = V_NAGLE(0) |
        V_NO_CONG(nocong) |
        V_KEEP_ALIVE(1) |
        F_TCAM_BYPASS |
        V_WND_SCALE(wscale) |
        V_MSS_IDX(mtu_idx) |
        V_L2T_IDX(ep->l2t->idx) | V_TX_CHANNEL(ep->l2t->smt_idx);
    opt0l = V_TOS((ep->tos >> 2) & M_TOS) | V_RCV_BUFSIZ(rcv_win>>10);
    opt2 = F_RX_COALESCE_VALID | V_RX_COALESCE(0) | V_FLAVORS_VALID(1) |
           V_CONG_CONTROL_FLAVOR(cong_flavor);
    skb->priority = CPL_PRIORITY_SETUP;
    set_arp_failure_handler(skb, act_open_req_arp_failure);

    req = (struct cpl_act_open_req *) skb_put(skb, sizeof(*req));
    req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
    OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, 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->opt0h = htonl(opt0h);
    req->opt0l = htonl(opt0l);
    req->params = 0;
    req->opt2 = htonl(opt2);
    return iwch_l2t_send(ep->com.tdev, skb, ep->l2t);
}

static void send_mpa_req(struct iwch_ep *ep, struct sk_buff *skb)
{
    int mpalen;
    struct tx_data_wr *req;
    struct mpa_message *mpa;
    int len;

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

    BUG_ON(skb_cloned(skb));

    mpalen = sizeof(*mpa) + ep->plen;
    if (skb->data + mpalen + sizeof(*req) > skb_end_pointer(skb)) {
        kfree_skb(skb);
        skb=alloc_skb(mpalen + sizeof(*req), GFP_KERNEL);
        if (!skb) {
            connect_reply_upcall(ep, -ENOMEM);
            return;
        }
    }
    skb_trim(skb, 0);
    skb_reserve(skb, sizeof(*req));
    skb_put(skb, mpalen);
    skb->priority = CPL_PRIORITY_DATA;
    mpa = (struct mpa_message *) skb->data;
    memset(mpa, 0, sizeof(*mpa));
    memcpy(mpa->key, MPA_KEY_REQ, sizeof(mpa->key));
    mpa->flags = (crc_enabled ? MPA_CRC : 0) |
             (markers_enabled ? MPA_MARKERS : 0);
    mpa->private_data_size = htons(ep->plen);
    mpa->revision = mpa_rev;

    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 tx_ack() will deref it.
     */
    skb_get(skb);
    set_arp_failure_handler(skb, arp_failure_discard);
    skb_reset_transport_header(skb);
    len = skb->len;
    req = (struct tx_data_wr *) skb_push(skb, sizeof(*req));
    req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA)|F_WR_COMPL);
    req->wr_lo = htonl(V_WR_TID(ep->hwtid));
    req->len = htonl(len);
    req->param = htonl(V_TX_PORT(ep->l2t->smt_idx) |
               V_TX_SNDBUF(snd_win>>15));
    req->flags = htonl(F_TX_INIT);
    req->sndseq = htonl(ep->snd_seq);
    BUG_ON(ep->mpa_skb);
    ep->mpa_skb = skb;
    iwch_l2t_send(ep->com.tdev, skb, ep->l2t);
    start_ep_timer(ep);
    state_set(&ep->com, MPA_REQ_SENT);
    return;
}

static int send_mpa_reject(struct iwch_ep *ep, const void *pdata, u8 plen)
{
    int mpalen;
    struct tx_data_wr *req;
    struct mpa_message *mpa;
    struct sk_buff *skb;

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

    mpalen = sizeof(*mpa) + plen;

    skb = get_skb(NULL, mpalen + sizeof(*req), GFP_KERNEL);
    if (!skb) {
        printk(KERN_ERR MOD "%s - cannot alloc skb!\n", __func__);
        return -ENOMEM;
    }
    skb_reserve(skb, sizeof(*req));
    mpa = (struct mpa_message *) skb_put(skb, mpalen);
    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 (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 tx_ack() will deref it.
     */
    skb_get(skb);
    skb->priority = CPL_PRIORITY_DATA;
    set_arp_failure_handler(skb, arp_failure_discard);
    skb_reset_transport_header(skb);
    req = (struct tx_data_wr *) skb_push(skb, sizeof(*req));
    req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA)|F_WR_COMPL);
    req->wr_lo = htonl(V_WR_TID(ep->hwtid));
    req->len = htonl(mpalen);
    req->param = htonl(V_TX_PORT(ep->l2t->smt_idx) |
               V_TX_SNDBUF(snd_win>>15));
    req->flags = htonl(F_TX_INIT);
    req->sndseq = htonl(ep->snd_seq);
    BUG_ON(ep->mpa_skb);
    ep->mpa_skb = skb;
    return iwch_l2t_send(ep->com.tdev, skb, ep->l2t);
}

static int send_mpa_reply(struct iwch_ep *ep, const void *pdata, u8 plen)
{
    int mpalen;
    struct tx_data_wr *req;
    struct mpa_message *mpa;
    int len;
    struct sk_buff *skb;

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

    mpalen = sizeof(*mpa) + plen;

    skb = get_skb(NULL, mpalen + sizeof(*req), GFP_KERNEL);
    if (!skb) {
        printk(KERN_ERR MOD "%s - cannot alloc skb!\n", __func__);
        return -ENOMEM;
    }
    skb->priority = CPL_PRIORITY_DATA;
    skb_reserve(skb, sizeof(*req));
    mpa = (struct mpa_message *) skb_put(skb, mpalen);
    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 = mpa_rev;
    mpa->private_data_size = htons(plen);
    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 tx_ack() will deref it.
     */
    skb_get(skb);
    set_arp_failure_handler(skb, arp_failure_discard);
    skb_reset_transport_header(skb);
    len = skb->len;
    req = (struct tx_data_wr *) skb_push(skb, sizeof(*req));
    req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA)|F_WR_COMPL);
    req->wr_lo = htonl(V_WR_TID(ep->hwtid));
    req->len = htonl(len);
    req->param = htonl(V_TX_PORT(ep->l2t->smt_idx) |
               V_TX_SNDBUF(snd_win>>15));
    req->flags = htonl(F_TX_INIT);
    req->sndseq = htonl(ep->snd_seq);
    ep->mpa_skb = skb;
    state_set(&ep->com, MPA_REP_SENT);
    return iwch_l2t_send(ep->com.tdev, skb, ep->l2t);
}

static int act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_ep *ep = ctx;
    struct cpl_act_establish *req = cplhdr(skb);
    unsigned int tid = GET_TID(req);

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

    dst_confirm(ep->dst);

    /* setup the hwtid for this connection */
    ep->hwtid = tid;
    cxgb3_insert_tid(ep->com.tdev, &t3c_client, ep, tid);

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

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

    /* dealloc the atid */
    cxgb3_free_atid(ep->com.tdev, ep->atid);

    /* start MPA negotiation */
    send_mpa_req(ep, skb);

    return 0;
}

static void abort_connection(struct iwch_ep *ep, struct sk_buff *skb, gfp_t gfp)
{
    PDBG("%s ep %p\n", __FILE__, ep);
    state_set(&ep->com, ABORTING);
    send_abort(ep, skb, gfp);
}

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

    PDBG("%s ep %p\n", __func__, ep);
    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 %d\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 peer_close_upcall(struct iwch_ep *ep)
{
    struct iw_cm_event event;

    PDBG("%s ep %p\n", __func__, ep);
    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 %d\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 iwch_ep *ep)
{
    struct iw_cm_event event;

    PDBG("%s ep %p\n", __func__, ep);
    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 %d\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 iwch_ep *ep, int status)
{
    struct iw_cm_event event;

    PDBG("%s ep %p status %d\n", __func__, ep, 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)) {
        event.private_data_len = ep->plen;
        event.private_data = ep->mpa_pkt + sizeof(struct mpa_message);
    }
    if (ep->com.cm_id) {
        PDBG("%s ep %p tid %d 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 iwch_ep *ep)
{
    struct iw_cm_event event;

    PDBG("%s ep %p tid %d\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.private_data_len = ep->plen;
    event.private_data = ep->mpa_pkt + sizeof(struct mpa_message);
    event.provider_data = ep;
    /*
     * Until ird/ord negotiation via MPAv2 support is added, send max
     * supported values
     */
    event.ird = event.ord = 8;
    if (state_read(&ep->parent_ep->com) != DEAD) {
        get_ep(&ep->com);
        ep->parent_ep->com.cm_id->event_handler(
                        ep->parent_ep->com.cm_id,
                        &event);
    }
    put_ep(&ep->parent_ep->com);
    ep->parent_ep = NULL;
}

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

    PDBG("%s ep %p\n", __func__, ep);
    memset(&event, 0, sizeof(event));
    event.event = IW_CM_EVENT_ESTABLISHED;
    /*
     * Until ird/ord negotiation via MPAv2 support is added, send max
     * supported values
     */
    event.ird = event.ord = 8;
    if (ep->com.cm_id) {
        PDBG("%s ep %p tid %d\n", __func__, ep, ep->hwtid);
        ep->com.cm_id->event_handler(ep->com.cm_id, &event);
    }
}

static int update_rx_credits(struct iwch_ep *ep, u32 credits)
{
    struct cpl_rx_data_ack *req;
    struct sk_buff *skb;

    PDBG("%s ep %p credits %u\n", __func__, ep, credits);
    skb = get_skb(NULL, sizeof(*req), 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, sizeof(*req));
    req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
    OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, ep->hwtid));
    req->credit_dack = htonl(V_RX_CREDITS(credits) | V_RX_FORCE_ACK(1));
    skb->priority = CPL_PRIORITY_ACK;
    iwch_cxgb3_ofld_send(ep->com.tdev, skb);
    return credits;
}

static void process_mpa_reply(struct iwch_ep *ep, struct sk_buff *skb)
{
    struct mpa_message *mpa;
    u16 plen;
    struct iwch_qp_attributes attrs;
    enum iwch_qp_attr_mask mask;
    int err;

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

    /*
     * 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) {
        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.initiator = 1;
    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_rev;
    PDBG("%s - crc_enabled=%d, recv_marker_enabled=%d, "
         "xmit_marker_enabled=%d, version=%d\n", __func__,
         ep->mpa_attr.crc_enabled, ep->mpa_attr.recv_marker_enabled,
         ep->mpa_attr.xmit_marker_enabled, ep->mpa_attr.version);

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

    mask = IWCH_QP_ATTR_NEXT_STATE |
        IWCH_QP_ATTR_LLP_STREAM_HANDLE | IWCH_QP_ATTR_MPA_ATTR |
        IWCH_QP_ATTR_MAX_IRD | IWCH_QP_ATTR_MAX_ORD;

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

    if (peer2peer && iwch_rqes_posted(ep->com.qp) == 0) {
        iwch_post_zb_read(ep);
    }

    goto out;
err:
    abort_connection(ep, skb, GFP_KERNEL);
out:
    connect_reply_upcall(ep, err);
    return;
}

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

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

    /*
     * 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_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)) {
        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__);
    mpa = (struct mpa_message *) ep->mpa_pkt;

    /*
     * Validate MPA Header.
     */
    if (mpa->revision != mpa_rev) {
        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_rev;
    PDBG("%s - crc_enabled=%d, recv_marker_enabled=%d, "
         "xmit_marker_enabled=%d, version=%d\n", __func__,
         ep->mpa_attr.crc_enabled, ep->mpa_attr.recv_marker_enabled,
         ep->mpa_attr.xmit_marker_enabled, ep->mpa_attr.version);

    state_set(&ep->com, MPA_REQ_RCVD);

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

static int rx_data(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_ep *ep = ctx;
    struct cpl_rx_data *hdr = cplhdr(skb);
    unsigned int dlen = ntohs(hdr->len);

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

    skb_pull(skb, sizeof(*hdr));
    skb_trim(skb, dlen);

    ep->rcv_seq += dlen;
    BUG_ON(ep->rcv_seq != (ntohl(hdr->seq) + 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 %d\n",
               __func__, ep, state_read(&ep->com), ep->hwtid);

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

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

    return CPL_RET_BUF_DONE;
}

/*
 * 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 tx_ack(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_ep *ep = ctx;
    struct cpl_wr_ack *hdr = cplhdr(skb);
    unsigned int credits = ntohs(hdr->credits);
    unsigned long flags;
    int post_zb = 0;

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

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

    spin_lock_irqsave(&ep->com.lock, flags);
    BUG_ON(credits != 1);
    dst_confirm(ep->dst);
    if (!ep->mpa_skb) {
        PDBG("%s rdma_init wr_ack ep %p state %u\n",
            __func__, ep, ep->com.state);
        if (ep->mpa_attr.initiator) {
            PDBG("%s initiator ep %p state %u\n",
                __func__, ep, ep->com.state);
            if (peer2peer && ep->com.state == FPDU_MODE)
                post_zb = 1;
        } else {
            PDBG("%s responder ep %p state %u\n",
                __func__, ep, ep->com.state);
            if (ep->com.state == MPA_REQ_RCVD) {
                ep->com.rpl_done = 1;
                wake_up(&ep->com.waitq);
            }
        }
    } else {
        PDBG("%s lsm ack ep %p state %u freeing skb\n",
            __func__, ep, ep->com.state);
        kfree_skb(ep->mpa_skb);
        ep->mpa_skb = NULL;
    }
    spin_unlock_irqrestore(&ep->com.lock, flags);
    if (post_zb)
        iwch_post_zb_read(ep);
    return CPL_RET_BUF_DONE;
}

static int abort_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_ep *ep = ctx;
    unsigned long flags;
    int release = 0;

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

    /*
     * We get 2 abort replies from the HW.  The first one must
     * be ignored except for scribbling that we need one more.
     */
    if (!test_and_set_bit(ABORT_REQ_IN_PROGRESS, &ep->com.flags)) {
        return CPL_RET_BUF_DONE;
    }

    spin_lock_irqsave(&ep->com.lock, flags);
    switch (ep->com.state) {
    case ABORTING:
        close_complete_upcall(ep);
        __state_set(&ep->com, DEAD);
        release = 1;
        break;
    default:
        printk(KERN_ERR "%s ep %p state %d\n",
             __func__, ep, ep->com.state);
        break;
    }
    spin_unlock_irqrestore(&ep->com.lock, flags);

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

/*
 * 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 t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_ep *ep = ctx;
    struct cpl_act_open_rpl *rpl = cplhdr(skb);

    PDBG("%s ep %p status %u errno %d\n", __func__, ep, rpl->status,
         status2errno(rpl->status));
    connect_reply_upcall(ep, status2errno(rpl->status));
    state_set(&ep->com, DEAD);
    if (ep->com.tdev->type != T3A && act_open_has_tid(rpl->status))
        release_tid(ep->com.tdev, GET_TID(rpl), NULL);
    cxgb3_free_atid(ep->com.tdev, ep->atid);
    dst_release(ep->dst);
    l2t_release(ep->com.tdev, ep->l2t);
    put_ep(&ep->com);
    return CPL_RET_BUF_DONE;
}

static int listen_start(struct iwch_listen_ep *ep)
{
    struct sk_buff *skb;
    struct cpl_pass_open_req *req;

    PDBG("%s ep %p\n", __func__, ep);
    skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
    if (!skb) {
        printk(KERN_ERR MOD "t3c_listen_start failed to alloc skb!\n");
        return -ENOMEM;
    }

    req = (struct cpl_pass_open_req *) skb_put(skb, sizeof(*req));
    req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
    OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_PASS_OPEN_REQ, ep->stid));
    req->local_port = ep->com.local_addr.sin_port;
    req->local_ip = ep->com.local_addr.sin_addr.s_addr;
    req->peer_port = 0;
    req->peer_ip = 0;
    req->peer_netmask = 0;
    req->opt0h = htonl(F_DELACK | F_TCAM_BYPASS);
    req->opt0l = htonl(V_RCV_BUFSIZ(rcv_win>>10));
    req->opt1 = htonl(V_CONN_POLICY(CPL_CONN_POLICY_ASK));

    skb->priority = 1;
    return iwch_cxgb3_ofld_send(ep->com.tdev, skb);
}

static int pass_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_listen_ep *ep = ctx;
    struct cpl_pass_open_rpl *rpl = cplhdr(skb);

    PDBG("%s ep %p status %d error %d\n", __func__, ep,
         rpl->status, status2errno(rpl->status));
    ep->com.rpl_err = status2errno(rpl->status);
    ep->com.rpl_done = 1;
    wake_up(&ep->com.waitq);

    return CPL_RET_BUF_DONE;
}

static int listen_stop(struct iwch_listen_ep *ep)
{
    struct sk_buff *skb;
    struct cpl_close_listserv_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_listserv_req *) skb_put(skb, sizeof(*req));
    req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
    req->cpu_idx = 0;
    OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_LISTSRV_REQ, ep->stid));
    skb->priority = 1;
    return iwch_cxgb3_ofld_send(ep->com.tdev, skb);
}

static int close_listsrv_rpl(struct t3cdev *tdev, struct sk_buff *skb,
                 void *ctx)
{
    struct iwch_listen_ep *ep = ctx;
    struct cpl_close_listserv_rpl *rpl = cplhdr(skb);

    PDBG("%s ep %p\n", __func__, ep);
    ep->com.rpl_err = status2errno(rpl->status);
    ep->com.rpl_done = 1;
    wake_up(&ep->com.waitq);
    return CPL_RET_BUF_DONE;
}

static void accept_cr(struct iwch_ep *ep, __be32 peer_ip, struct sk_buff *skb)
{
    struct cpl_pass_accept_rpl *rpl;
    unsigned int mtu_idx;
    u32 opt0h, opt0l, opt2;
    int wscale;

    PDBG("%s ep %p\n", __func__, ep);
    BUG_ON(skb_cloned(skb));
    skb_trim(skb, sizeof(*rpl));
    skb_get(skb);
    mtu_idx = find_best_mtu(T3C_DATA(ep->com.tdev), dst_mtu(ep->dst));
    wscale = compute_wscale(rcv_win);
    opt0h = V_NAGLE(0) |
        V_NO_CONG(nocong) |
        V_KEEP_ALIVE(1) |
        F_TCAM_BYPASS |
        V_WND_SCALE(wscale) |
        V_MSS_IDX(mtu_idx) |
        V_L2T_IDX(ep->l2t->idx) | V_TX_CHANNEL(ep->l2t->smt_idx);
    opt0l = V_TOS((ep->tos >> 2) & M_TOS) | V_RCV_BUFSIZ(rcv_win>>10);
    opt2 = F_RX_COALESCE_VALID | V_RX_COALESCE(0) | V_FLAVORS_VALID(1) |
           V_CONG_CONTROL_FLAVOR(cong_flavor);

    rpl = cplhdr(skb);
    rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
    OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_PASS_ACCEPT_RPL, ep->hwtid));
    rpl->peer_ip = peer_ip;
    rpl->opt0h = htonl(opt0h);
    rpl->opt0l_status = htonl(opt0l | CPL_PASS_OPEN_ACCEPT);
    rpl->opt2 = htonl(opt2);
    rpl->rsvd = rpl->opt2;  /* workaround for HW bug */
    skb->priority = CPL_PRIORITY_SETUP;
    iwch_l2t_send(ep->com.tdev, skb, ep->l2t);

    return;
}

static void reject_cr(struct t3cdev *tdev, u32 hwtid, __be32 peer_ip,
              struct sk_buff *skb)
{
    PDBG("%s t3cdev %p tid %u peer_ip %x\n", __func__, tdev, hwtid,
         peer_ip);
    BUG_ON(skb_cloned(skb));
    skb_trim(skb, sizeof(struct cpl_tid_release));
    skb_get(skb);

    if (tdev->type != T3A)
        release_tid(tdev, hwtid, skb);
    else {
        struct cpl_pass_accept_rpl *rpl;

        rpl = cplhdr(skb);
        skb->priority = CPL_PRIORITY_SETUP;
        rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
        OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_PASS_ACCEPT_RPL,
                              hwtid));
        rpl->peer_ip = peer_ip;
        rpl->opt0h = htonl(F_TCAM_BYPASS);
        rpl->opt0l_status = htonl(CPL_PASS_OPEN_REJECT);
        rpl->opt2 = 0;
        rpl->rsvd = rpl->opt2;
        iwch_cxgb3_ofld_send(tdev, skb);
    }
}

static int pass_accept_req(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_ep *child_ep, *parent_ep = ctx;
    struct cpl_pass_accept_req *req = cplhdr(skb);
    unsigned int hwtid = GET_TID(req);
    struct dst_entry *dst;
    struct l2t_entry *l2t;
    struct rtable *rt;
    struct iff_mac tim;

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

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

    /*
     * Find the netdev for this connection request.
     */
    tim.mac_addr = req->dst_mac;
    tim.vlan_tag = ntohs(req->vlan_tag);
    if (tdev->ctl(tdev, GET_IFF_FROM_MAC, &tim) < 0 || !tim.dev) {
        printk(KERN_ERR "%s bad dst mac %pM\n",
            __func__, req->dst_mac);
        goto reject;
    }

    /* Find output route */
    rt = find_route(tdev,
            req->local_ip,
            req->peer_ip,
            req->local_port,
            req->peer_port, G_PASS_OPEN_TOS(ntohl(req->tos_tid)));
    if (!rt) {
        printk(KERN_ERR MOD "%s - failed to find dst entry!\n",
               __func__);
        goto reject;
    }
    dst = &rt->dst;
    l2t = t3_l2t_get(tdev, dst, NULL, &req->peer_ip);
    if (!l2t) {
        printk(KERN_ERR MOD "%s - failed to allocate l2t entry!\n",
               __func__);
        dst_release(dst);
        goto reject;
    }
    child_ep = alloc_ep(sizeof(*child_ep), GFP_KERNEL);
    if (!child_ep) {
        printk(KERN_ERR MOD "%s - failed to allocate ep entry!\n",
               __func__);
        l2t_release(tdev, l2t);
        dst_release(dst);
        goto reject;
    }
    state_set(&child_ep->com, CONNECTING);
    child_ep->com.tdev = tdev;
    child_ep->com.cm_id = NULL;
    child_ep->com.local_addr.sin_family = PF_INET;
    child_ep->com.local_addr.sin_port = req->local_port;
    child_ep->com.local_addr.sin_addr.s_addr = req->local_ip;
    child_ep->com.remote_addr.sin_family = PF_INET;
    child_ep->com.remote_addr.sin_port = req->peer_port;
    child_ep->com.remote_addr.sin_addr.s_addr = req->peer_ip;
    get_ep(&parent_ep->com);
    child_ep->parent_ep = parent_ep;
    child_ep->tos = G_PASS_OPEN_TOS(ntohl(req->tos_tid));
    child_ep->l2t = l2t;
    child_ep->dst = dst;
    child_ep->hwtid = hwtid;
    init_timer(&child_ep->timer);
    cxgb3_insert_tid(tdev, &t3c_client, child_ep, hwtid);
    accept_cr(child_ep, req->peer_ip, skb);
    goto out;
reject:
    reject_cr(tdev, hwtid, req->peer_ip, skb);
out:
    return CPL_RET_BUF_DONE;
}

static int pass_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_ep *ep = ctx;
    struct cpl_pass_establish *req = cplhdr(skb);

    PDBG("%s ep %p\n", __func__, ep);
    ep->snd_seq = ntohl(req->snd_isn);
    ep->rcv_seq = ntohl(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);

    return CPL_RET_BUF_DONE;
}

static int peer_close(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_ep *ep = ctx;
    struct iwch_qp_attributes attrs;
    unsigned long flags;
    int disconnect = 1;
    int release = 0;

    PDBG("%s ep %p\n", __func__, ep);
    dst_confirm(ep->dst);

    spin_lock_irqsave(&ep->com.lock, flags);
    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 iwch_accept_cr()).
         */
        __state_set(&ep->com, CLOSING);
        ep->com.rpl_done = 1;
        ep->com.rpl_err = -ECONNRESET;
        PDBG("waking up ep %p\n", ep);
        wake_up(&ep->com.waitq);
        break;
    case MPA_REP_SENT:
        __state_set(&ep->com, CLOSING);
        ep->com.rpl_done = 1;
        ep->com.rpl_err = -ECONNRESET;
        PDBG("waking up ep %p\n", ep);
        wake_up(&ep->com.waitq);
        break;
    case FPDU_MODE:
        start_ep_timer(ep);
        __state_set(&ep->com, CLOSING);
        attrs.next_state = IWCH_QP_STATE_CLOSING;
        iwch_modify_qp(ep->com.qp->rhp, ep->com.qp,
                   IWCH_QP_ATTR_NEXT_STATE, &attrs, 1);
        peer_close_upcall(ep);
        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 = IWCH_QP_STATE_IDLE;
            iwch_modify_qp(ep->com.qp->rhp, ep->com.qp,
                       IWCH_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);
    }
    spin_unlock_irqrestore(&ep->com.lock, flags);
    if (disconnect)
        iwch_ep_disconnect(ep, 0, GFP_KERNEL);
    if (release)
        release_ep_resources(ep);
    return CPL_RET_BUF_DONE;
}

/*
 * 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 peer_abort(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct cpl_abort_req_rss *req = cplhdr(skb);
    struct iwch_ep *ep = ctx;
    struct cpl_abort_rpl *rpl;
    struct sk_buff *rpl_skb;
    struct iwch_qp_attributes attrs;
    int ret;
    int release = 0;
    unsigned long flags;

    if (is_neg_adv_abort(req->status)) {
        PDBG("%s neg_adv_abort ep %p tid %d\n", __func__, ep,
             ep->hwtid);
        t3_l2t_send_event(ep->com.tdev, ep->l2t);
        return CPL_RET_BUF_DONE;
    }

    /*
     * We get 2 peer aborts from the HW.  The first one must
     * be ignored except for scribbling that we need one more.
     */
    if (!test_and_set_bit(PEER_ABORT_IN_PROGRESS, &ep->com.flags)) {
        return CPL_RET_BUF_DONE;
    }

    spin_lock_irqsave(&ep->com.lock, flags);
    PDBG("%s ep %p state %u\n", __func__, ep, ep->com.state);
    switch (ep->com.state) {
    case CONNECTING:
        break;
    case MPA_REQ_WAIT:
        stop_ep_timer(ep);
        break;
    case MPA_REQ_SENT:
        stop_ep_timer(ep);
        connect_reply_upcall(ep, -ECONNRESET);
        break;
    case MPA_REP_SENT:
        ep->com.rpl_done = 1;
        ep->com.rpl_err = -ECONNRESET;
        PDBG("waking up ep %p\n", ep);
        wake_up(&ep->com.waitq);
        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 iwch_accept_cr()).
         */
        ep->com.rpl_done = 1;
        ep->com.rpl_err = -ECONNRESET;
        PDBG("waking up ep %p\n", ep);
        wake_up(&ep->com.waitq);
        break;
    case MORIBUND:
    case CLOSING:
        stop_ep_timer(ep);
        /*FALLTHROUGH*/
    case FPDU_MODE:
        if (ep->com.cm_id && ep->com.qp) {
            attrs.next_state = IWCH_QP_STATE_ERROR;
            ret = iwch_modify_qp(ep->com.qp->rhp,
                     ep->com.qp, IWCH_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__);
        spin_unlock_irqrestore(&ep->com.lock, flags);
        return CPL_RET_BUF_DONE;
    default:
        BUG_ON(1);
        break;
    }
    dst_confirm(ep->dst);
    if (ep->com.state != ABORTING) {
        __state_set(&ep->com, DEAD);
        release = 1;
    }
    spin_unlock_irqrestore(&ep->com.lock, flags);

    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;
    }
    rpl_skb->priority = CPL_PRIORITY_DATA;
    rpl = (struct cpl_abort_rpl *) skb_put(rpl_skb, sizeof(*rpl));
    rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
    rpl->wr.wr_lo = htonl(V_WR_TID(ep->hwtid));
    OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, ep->hwtid));
    rpl->cmd = CPL_ABORT_NO_RST;
    iwch_cxgb3_ofld_send(ep->com.tdev, rpl_skb);
out:
    if (release)
        release_ep_resources(ep);
    return CPL_RET_BUF_DONE;
}

static int close_con_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_ep *ep = ctx;
    struct iwch_qp_attributes attrs;
    unsigned long flags;
    int release = 0;

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

    /* The cm_id may be null if we failed to connect */
    spin_lock_irqsave(&ep->com.lock, flags);
    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 = IWCH_QP_STATE_IDLE;
            iwch_modify_qp(ep->com.qp->rhp,
                         ep->com.qp,
                         IWCH_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;
    }
    spin_unlock_irqrestore(&ep->com.lock, flags);
    if (release)
        release_ep_resources(ep);
    return CPL_RET_BUF_DONE;
}

/*
 * T3A does 3 things when a TERM is received:
 * 1) send up a CPL_RDMA_TERMINATE message with the TERM packet
 * 2) generate an async event on the QP with the TERMINATE opcode
 * 3) post a TERMINATE opcode cqe into the associated CQ.
 *
 * For (1), we save the message in the qp for later consumer consumption.
 * For (2), we move the QP into TERMINATE, post a QP event and disconnect.
 * For (3), we toss the CQE in cxio_poll_cq().
 *
 * terminate() handles case (1)...
 */
static int terminate(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_ep *ep = ctx;

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

    PDBG("%s ep %p\n", __func__, ep);
    skb_pull(skb, sizeof(struct cpl_rdma_terminate));
    PDBG("%s saving %d bytes of term msg\n", __func__, skb->len);
    skb_copy_from_linear_data(skb, ep->com.qp->attr.terminate_buffer,
                  skb->len);
    ep->com.qp->attr.terminate_msg_len = skb->len;
    ep->com.qp->attr.is_terminate_local = 0;
    return CPL_RET_BUF_DONE;
}

static int ec_status(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct cpl_rdma_ec_status *rep = cplhdr(skb);
    struct iwch_ep *ep = ctx;

    PDBG("%s ep %p tid %u status %d\n", __func__, ep, ep->hwtid,
         rep->status);
    if (rep->status) {
        struct iwch_qp_attributes attrs;

        printk(KERN_ERR MOD "%s BAD CLOSE - Aborting tid %u\n",
               __func__, ep->hwtid);
        stop_ep_timer(ep);
        attrs.next_state = IWCH_QP_STATE_ERROR;
        iwch_modify_qp(ep->com.qp->rhp,
                   ep->com.qp, IWCH_QP_ATTR_NEXT_STATE,
                   &attrs, 1);
        abort_connection(ep, NULL, GFP_KERNEL);
    }
    return CPL_RET_BUF_DONE;
}

static void ep_timeout(unsigned long arg)
{
    struct iwch_ep *ep = (struct iwch_ep *)arg;
    struct iwch_qp_attributes attrs;
    unsigned long flags;
    int abort = 1;

    spin_lock_irqsave(&ep->com.lock, flags);
    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 = IWCH_QP_STATE_ERROR;
            iwch_modify_qp(ep->com.qp->rhp,
                     ep->com.qp, IWCH_QP_ATTR_NEXT_STATE,
                     &attrs, 1);
        }
        __state_set(&ep->com, ABORTING);
        break;
    default:
        printk(KERN_ERR "%s unexpected state ep %p state %u\n",
            __func__, ep, ep->com.state);
        WARN_ON(1);
        abort = 0;
    }
    spin_unlock_irqrestore(&ep->com.lock, flags);
    if (abort)
        abort_connection(ep, NULL, GFP_ATOMIC);
    put_ep(&ep->com);
}

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

    if (state_read(&ep->com) == DEAD) {
        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 = iwch_ep_disconnect(ep, 0, GFP_KERNEL);
    }
    put_ep(&ep->com);
    return 0;
}

int iwch_accept_cr(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
{
    int err;
    struct iwch_qp_attributes attrs;
    enum iwch_qp_attr_mask mask;
    struct iwch_ep *ep = to_ep(cm_id);
    struct iwch_dev *h = to_iwch_dev(cm_id->device);
    struct iwch_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 > qp->rhp->attr.max_rdma_read_qp_depth) ||
        (conn_param->ird > qp->rhp->attr.max_rdma_reads_per_qp)) {
        abort_connection(ep, NULL, GFP_KERNEL);
        err = -EINVAL;
        goto err;
    }

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

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

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

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

    /* 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 = IWCH_QP_STATE_RTS;

    /* bind QP and TID with INIT_WR */
    mask = IWCH_QP_ATTR_NEXT_STATE |
                 IWCH_QP_ATTR_LLP_STREAM_HANDLE |
                 IWCH_QP_ATTR_MPA_ATTR |
                 IWCH_QP_ATTR_MAX_IRD |
                 IWCH_QP_ATTR_MAX_ORD;

    err = iwch_modify_qp(ep->com.qp->rhp,
                 ep->com.qp, mask, &attrs, 1);
    if (err)
        goto err1;

    /* if needed, wait for wr_ack */
    if (iwch_rqes_posted(qp)) {
        wait_event(ep->com.waitq, ep->com.rpl_done);
        err = ep->com.rpl_err;
        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);
    put_ep(&ep->com);
    return 0;
err1:
    ep->com.cm_id = NULL;
    ep->com.qp = NULL;
    cm_id->rem_ref(cm_id);
err:
    put_ep(&ep->com);
    return err;
}

static int is_loopback_dst(struct iw_cm_id *cm_id)
{
    struct net_device *dev;

    dev = ip_dev_find(&init_net, cm_id->remote_addr.sin_addr.s_addr);
    if (!dev)
        return 0;
    dev_put(dev);
    return 1;
}

int iwch_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
{
    struct iwch_dev *h = to_iwch_dev(cm_id->device);
    struct iwch_ep *ep;
    struct rtable *rt;
    int err = 0;

    if (is_loopback_dst(cm_id)) {
        err = -ENOSYS;
        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;

    ep->com.tdev = h->rdev.t3cdev_p;

    cm_id->add_ref(cm_id);
    ep->com.cm_id = cm_id;
    ep->com.qp = get_qhp(h, 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 = cxgb3_alloc_atid(h->rdev.t3cdev_p, &t3c_client, 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(h->rdev.t3cdev_p,
            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, IPTOS_LOWDELAY);
    if (!rt) {
        printk(KERN_ERR MOD "%s - cannot find route.\n", __func__);
        err = -EHOSTUNREACH;
        goto fail3;
    }
    ep->dst = &rt->dst;
    ep->l2t = t3_l2t_get(ep->com.tdev, ep->dst, NULL,
                 &cm_id->remote_addr.sin_addr.s_addr);
    if (!ep->l2t) {
        printk(KERN_ERR MOD "%s - cannot alloc l2e.\n", __func__);
        err = -ENOMEM;
        goto fail4;
    }

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

    l2t_release(h->rdev.t3cdev_p, ep->l2t);
fail4:
    dst_release(ep->dst);
fail3:
    cxgb3_free_atid(ep->com.tdev, ep->atid);
fail2:
    cm_id->rem_ref(cm_id);
    put_ep(&ep->com);
out:
    return err;
}

int iwch_create_listen(struct iw_cm_id *cm_id, int backlog)
{
    int err = 0;
    struct iwch_dev *h = to_iwch_dev(cm_id->device);
    struct iwch_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);
    ep->com.tdev = h->rdev.t3cdev_p;
    cm_id->add_ref(cm_id);
    ep->com.cm_id = cm_id;
    ep->backlog = backlog;
    ep->com.local_addr = cm_id->local_addr;

    /*
     * Allocate a server TID.
     */
    ep->stid = cxgb3_alloc_stid(h->rdev.t3cdev_p, &t3c_client, ep);
    if (ep->stid == -1) {
        printk(KERN_ERR MOD "%s - cannot alloc atid.\n", __func__);
        err = -ENOMEM;
        goto fail2;
    }

    state_set(&ep->com, LISTEN);
    err = listen_start(ep);
    if (err)
        goto fail3;

    /* wait for pass_open_rpl */
    wait_event(ep->com.waitq, ep->com.rpl_done);
    err = ep->com.rpl_err;
    if (!err) {
        cm_id->provider_data = ep;
        goto out;
    }
fail3:
    cxgb3_free_stid(ep->com.tdev, ep->stid);
fail2:
    cm_id->rem_ref(cm_id);
    put_ep(&ep->com);
fail1:
out:
    return err;
}

int iwch_destroy_listen(struct iw_cm_id *cm_id)
{
    int err;
    struct iwch_listen_ep *ep = to_listen_ep(cm_id);

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

    might_sleep();
    state_set(&ep->com, DEAD);
    ep->com.rpl_done = 0;
    ep->com.rpl_err = 0;
    err = listen_stop(ep);
    if (err)
        goto done;
    wait_event(ep->com.waitq, ep->com.rpl_done);
    cxgb3_free_stid(ep->com.tdev, ep->stid);
done:
    err = ep->com.rpl_err;
    cm_id->rem_ref(cm_id);
    put_ep(&ep->com);
    return err;
}

int iwch_ep_disconnect(struct iwch_ep *ep, int abrupt, gfp_t gfp)
{
    int ret=0;
    unsigned long flags;
    int close = 0;
    int fatal = 0;
    struct t3cdev *tdev;
    struct cxio_rdev *rdev;

    spin_lock_irqsave(&ep->com.lock, flags);

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

    tdev = (struct t3cdev *)ep->com.tdev;
    rdev = (struct cxio_rdev *)tdev->ulp;
    if (cxio_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;
    }

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

int iwch_ep_redirect(void *ctx, struct dst_entry *old, struct dst_entry *new,
             struct l2t_entry *l2t)
{
    struct iwch_ep *ep = ctx;

    if (ep->dst != old)
        return 0;

    PDBG("%s ep %p redirect to dst %p l2t %p\n", __func__, ep, new,
         l2t);
    dst_hold(new);
    l2t_release(ep->com.tdev, ep->l2t);
    ep->l2t = l2t;
    dst_release(old);
    ep->dst = new;
    return 1;
}

/*
 * All the CM events are handled on a work queue to have a safe context.
 * These are the real handlers that are called from the work queue.
 */
static const cxgb3_cpl_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_TX_DMA_ACK]    = tx_ack,
    [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_RDMA_EC_STATUS]    = ec_status,
};

static void process_work(struct work_struct *work)
{
    struct sk_buff *skb = NULL;
    void *ep;
    struct t3cdev *tdev;
    int ret;

    while ((skb = skb_dequeue(&rxq))) {
        ep = *((void **) (skb->cb));
        tdev = *((struct t3cdev **) (skb->cb + sizeof(void *)));
        ret = work_handlers[G_OPCODE(ntohl((__force __be32)skb->csum))](tdev, skb, ep);
        if (ret & CPL_RET_BUF_DONE)
            kfree_skb(skb);

        /*
         * ep was referenced in sched(), and is freed here.
         */
        put_ep((struct iwch_ep_common *)ep);
    }
}

static DECLARE_WORK(skb_work, process_work);

static int sched(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    struct iwch_ep_common *epc = ctx;

    get_ep(epc);

    /*
     * Save ctx and tdev in the skb->cb area.
     */
    *((void **) skb->cb) = ctx;
    *((struct t3cdev **) (skb->cb + sizeof(void *))) = tdev;

    /*
     * 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 t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
    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));
    }
    return CPL_RET_BUF_DONE;
}

/*
 * All upcalls from the T3 Core go to sched() to schedule the
 * processing on a work queue.
 */
cxgb3_cpl_handler_func t3c_handlers[NUM_CPL_CMDS] = {
    [CPL_ACT_ESTABLISH] = sched,
    [CPL_ACT_OPEN_RPL]  = sched,
    [CPL_RX_DATA]       = sched,
    [CPL_TX_DMA_ACK]    = 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] = sched,
    [CPL_RDMA_TERMINATE]    = sched,
    [CPL_RDMA_EC_STATUS]    = sched,
    [CPL_SET_TCB_RPL]   = set_tcb_rpl,
};

int __init iwch_cm_init(void)
{
    skb_queue_head_init(&rxq);

    workq = create_singlethread_workqueue("iw_cxgb3");
    if (!workq)
        return -ENOMEM;

    return 0;
}

void __exit iwch_cm_term(void)
{
    flush_workqueue(workq);
    destroy_workqueue(workq);
}