/*
 * 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 <linux/if_vlan.h>

#include <net/neighbour.h>
#include <net/netevent.h>
#include <net/route.h>
#include <net/tcp.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 nocong;
module_param(nocong, int, 0644);
MODULE_PARM_DESC(nocong, "Turn of congestion control (default=0)");

static int enable_ecn;
module_param(enable_ecn, int, 0644);
MODULE_PARM_DESC(enable_ecn, "Enable ECN (default=0/disabled)");

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 deref_qp(struct c4iw_ep *ep)
{
        c4iw_qp_rem_ref(&ep->com.qp->ibqp);
        clear_bit(QP_REFERENCED, &ep->com.flags);
}

static void ref_qp(struct c4iw_ep *ep)
{
        set_bit(QP_REFERENCED, &ep->com.flags);
        c4iw_qp_add_ref(&ep->com.qp->ibqp);
}

static void start_ep_timer(struct c4iw_ep *ep)
{
        PDBG("%s ep %p\n", __func__, ep);
        if (timer_pending(&ep->timer)) {
                pr_err("%s timer already started! ep %p\n",
                       __func__, ep);
                return;
        }
        clear_bit(TIMEOUT, &ep->com.flags);
        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 stopping\n", __func__, ep);
        del_timer_sync(&ep->timer);
        if (!test_and_set_bit(TIMEOUT, &ep->com.flags))
                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(QP_REFERENCED, &ep->com.flags))
                deref_qp(ep);
        if (test_bit(RELEASE_RESOURCES, &ep->com.flags)) {
                remove_handle(ep->com.dev, &ep->com.dev->hwtid_idr, ep->hwtid);
                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);
}

#define VLAN_NONE 0xfff
#define FILTER_SEL_VLAN_NONE 0xffff
#define FILTER_SEL_WIDTH_P_FC (3+1) /* port uses 3 bits, FCoE one bit */
#define FILTER_SEL_WIDTH_VIN_P_FC \
        (6 + 7 + FILTER_SEL_WIDTH_P_FC) /* 6 bits are unused, VF uses 7 bits*/
#define FILTER_SEL_WIDTH_TAG_P_FC \
        (3 + FILTER_SEL_WIDTH_VIN_P_FC) /* PF uses 3 bits */
#define FILTER_SEL_WIDTH_VLD_TAG_P_FC (1 + FILTER_SEL_WIDTH_TAG_P_FC)

static unsigned int select_ntuple(struct c4iw_dev *dev, struct dst_entry *dst,
                                  struct l2t_entry *l2t)
{
        unsigned int ntuple = 0;
        u32 viid;

        switch (dev->rdev.lldi.filt_mode) {

        /* default filter mode */
        case HW_TPL_FR_MT_PR_IV_P_FC:
                if (l2t->vlan == VLAN_NONE)
                        ntuple |= FILTER_SEL_VLAN_NONE << FILTER_SEL_WIDTH_P_FC;
                else {
                        ntuple |= l2t->vlan << FILTER_SEL_WIDTH_P_FC;
                        ntuple |= 1 << FILTER_SEL_WIDTH_VLD_TAG_P_FC;
                }
                ntuple |= l2t->lport << S_PORT | IPPROTO_TCP <<
                          FILTER_SEL_WIDTH_VLD_TAG_P_FC;
                break;
        case HW_TPL_FR_MT_PR_OV_P_FC: {
                viid = cxgb4_port_viid(l2t->neigh->dev);

                ntuple |= FW_VIID_VIN_GET(viid) << FILTER_SEL_WIDTH_P_FC;
                ntuple |= FW_VIID_PFN_GET(viid) << FILTER_SEL_WIDTH_VIN_P_FC;
                ntuple |= FW_VIID_VIVLD_GET(viid) << FILTER_SEL_WIDTH_TAG_P_FC;
                ntuple |= l2t->lport << S_PORT | IPPROTO_TCP <<
                          FILTER_SEL_WIDTH_VLD_TAG_P_FC;
                break;
        }
        default:
                break;
        }
        return ntuple;
}

static int send_connect(struct c4iw_ep *ep)
{
        struct cpl_act_open_req *req;
        struct cpl_t5_act_open_req *t5_req;
        struct sk_buff *skb;
        u64 opt0;
        u32 opt2;
        unsigned int mtu_idx;
        int wscale;
        int size = is_t4(ep->com.dev->rdev.lldi.adapter_type) ?
                sizeof(struct cpl_act_open_req) :
                sizeof(struct cpl_t5_act_open_req);
        int wrlen = roundup(size, 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 = (nocong ? NO_CONG(1) : 0) |
               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) |
               CCTRL_ECN(enable_ecn) |
               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);

        if (is_t4(ep->com.dev->rdev.lldi.adapter_type)) {
                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 = cpu_to_be32(select_ntuple(ep->com.dev,
                                        ep->dst, ep->l2t));
                req->opt2 = cpu_to_be32(opt2);
        } else {
                t5_req = (struct cpl_t5_act_open_req *) skb_put(skb, wrlen);
                INIT_TP_WR(t5_req, 0);
                OPCODE_TID(t5_req) = cpu_to_be32(
                                        MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
                                        ((ep->rss_qid << 14) | ep->atid)));
                t5_req->local_port = ep->com.local_addr.sin_port;
                t5_req->peer_port = ep->com.remote_addr.sin_port;
                t5_req->local_ip = ep->com.local_addr.sin_addr.s_addr;
                t5_req->peer_ip = ep->com.remote_addr.sin_addr.s_addr;
                t5_req->opt0 = cpu_to_be64(opt0);
                t5_req->params = cpu_to_be64(V_FILTER_TUPLE(
                                select_ntuple(ep->com.dev, ep->dst, ep->l2t)));
                t5_req->opt2 = cpu_to_be32(opt2);
        }

        set_bit(ACT_OPEN_REQ, &ep->com.history);
        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 = 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) |
                                          (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);
        insert_handle(dev, &dev->hwtid_idr, 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));

        /* dealloc the atid */
        remove_handle(ep->com.dev, &ep->com.dev->atid_idr, atid);
        cxgb4_free_atid(t, atid);
        set_bit(ACT_ESTAB, &ep->com.history);

        /* 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;
                set_bit(CLOSE_UPCALL, &ep->com.history);
        }
}

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);
        set_bit(ABORT_CONN, &ep->com.history);
        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);
                set_bit(DISCONN_UPCALL, &ep->com.history);
        }
}

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;
                set_bit(ABORT_UPCALL, &ep->com.history);
        }
}

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);
        set_bit(CONN_RPL_UPCALL, &ep->com.history);
        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;
        }
}

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);
        }
        set_bit(CONNREQ_UPCALL, &ep->com.history);
        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);
                set_bit(ESTAB_UPCALL, &ep->com.history);
        }
}

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);
                stop_ep_timer(ep);
                abort_connection(ep, skb, GFP_KERNEL);
                return;
        }

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

        /*
         * If plen does not account for pkt size
         */
        if (ep->mpa_pkt_len > (sizeof(*mpa) + plen)) {
                stop_ep_timer(ep);
                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;
        __u8 status = hdr->status;

        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);

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

        switch (state_read(&ep->com)) {
        case MPA_REQ_SENT:
                ep->rcv_seq += dlen;
                process_mpa_reply(ep, skb);
                break;
        case MPA_REQ_WAIT:
                ep->rcv_seq += dlen;
                process_mpa_request(ep, skb);
                break;
        case FPDU_MODE: {
                struct c4iw_qp_attributes attrs;
                BUG_ON(!ep->com.qp);
                if (status)
                        pr_err("%s Unexpected streaming data." \
                               " qpid %u ep %p state %d tid %u status %d\n",
                               __func__, ep->com.qp->wq.sq.qid, ep,
                               state_read(&ep->com), ep->hwtid, status);
                attrs.next_state = C4IW_QP_STATE_ERROR;
                c4iw_modify_qp(ep->com.qp->rhp, ep->com.qp,
                               C4IW_QP_ATTR_NEXT_STATE, &attrs, 1);
                c4iw_ep_disconnect(ep, 1, GFP_KERNEL);
                break;
        }
        default:
                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:
                c4iw_wake_up(&ep->com.wr_wait, -ECONNRESET);
                __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;
}

static void send_fw_act_open_req(struct c4iw_ep *ep, unsigned int atid)
{
        struct sk_buff *skb;
        struct fw_ofld_connection_wr *req;
        unsigned int mtu_idx;
        int wscale;

        skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
        req = (struct fw_ofld_connection_wr *)__skb_put(skb, sizeof(*req));
        memset(req, 0, sizeof(*req));
        req->op_compl = htonl(V_WR_OP(FW_OFLD_CONNECTION_WR));
        req->len16_pkd = htonl(FW_WR_LEN16(DIV_ROUND_UP(sizeof(*req), 16)));
        req->le.filter = cpu_to_be32(select_ntuple(ep->com.dev, ep->dst,
                                     ep->l2t));
        req->le.lport = ep->com.local_addr.sin_port;
        req->le.pport = ep->com.remote_addr.sin_port;
        req->le.u.ipv4.lip = ep->com.local_addr.sin_addr.s_addr;
        req->le.u.ipv4.pip = ep->com.remote_addr.sin_addr.s_addr;
        req->tcb.t_state_to_astid =
                        htonl(V_FW_OFLD_CONNECTION_WR_T_STATE(TCP_SYN_SENT) |
                        V_FW_OFLD_CONNECTION_WR_ASTID(atid));
        req->tcb.cplrxdataack_cplpassacceptrpl =
                        htons(F_FW_OFLD_CONNECTION_WR_CPLRXDATAACK);
        req->tcb.tx_max = (__force __be32) jiffies;
        req->tcb.rcv_adv = htons(1);
        cxgb4_best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx);
        wscale = compute_wscale(rcv_win);
        req->tcb.opt0 = (__force __be64) (TCAM_BYPASS(1) |
                (nocong ? NO_CONG(1) : 0) |
                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));
        req->tcb.opt2 = (__force __be32) (PACE(1) |
                TX_QUEUE(ep->com.dev->rdev.lldi.tx_modq[ep->tx_chan]) |
                RX_CHANNEL(0) |
                CCTRL_ECN(enable_ecn) |
                RSS_QUEUE_VALID | RSS_QUEUE(ep->rss_qid));
        if (enable_tcp_timestamps)
                req->tcb.opt2 |= (__force __be32) TSTAMPS_EN(1);
        if (enable_tcp_sack)
                req->tcb.opt2 |= (__force __be32) SACK_EN(1);
        if (wscale && enable_tcp_window_scaling)
                req->tcb.opt2 |= (__force __be32) WND_SCALE_EN(1);
        req->tcb.opt0 = cpu_to_be64((__force u64) req->tcb.opt0);
        req->tcb.opt2 = cpu_to_be32((__force u32) req->tcb.opt2);
        set_wr_txq(skb, CPL_PRIORITY_CONTROL, ep->ctrlq_idx);
        set_bit(ACT_OFLD_CONN, &ep->com.history);
        c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
}

/*
 * 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;
}

#define ACT_OPEN_RETRY_COUNT 2

static int c4iw_reconnect(struct c4iw_ep *ep)
{
        int err = 0;
        struct rtable *rt;
        struct port_info *pi;
        struct net_device *pdev;
        int step;
        struct neighbour *neigh;

        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) {
                pr_err("%s - cannot alloc atid.\n", __func__);
                err = -ENOMEM;
                goto fail2;
        }
        insert_handle(ep->com.dev, &ep->com.dev->atid_idr, ep, ep->atid);

        /* 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) {
                pr_err("%s - cannot find route.\n", __func__);
                err = -EHOSTUNREACH;
                goto fail3;
        }
        ep->dst = &rt->dst;

        neigh = dst_neigh_lookup(ep->dst,
                        &ep->com.cm_id->remote_addr.sin_addr.s_addr);
        if (!neigh) {
                pr_err("%s - cannot alloc neigh.\n", __func__);
                err = -ENOMEM;
                goto fail4;
        }

        /* get a l2t entry */
        if (neigh->dev->flags & IFF_LOOPBACK) {
                PDBG("%s LOOPBACK\n", __func__);
                pdev = ip_dev_find(&init_net,
                                ep->com.cm_id->remote_addr.sin_addr.s_addr);
                ep->l2t = cxgb4_l2t_get(ep->com.dev->rdev.lldi.l2t,
                                neigh, pdev, 0);
                pi = (struct port_info *)netdev_priv(pdev);
                ep->mtu = pdev->mtu;
                ep->tx_chan = cxgb4_port_chan(pdev);
                ep->smac_idx = (cxgb4_port_viid(pdev) & 0x7F) << 1;
                dev_put(pdev);
        } else {
                ep->l2t = cxgb4_l2t_get(ep->com.dev->rdev.lldi.l2t,
                                neigh, neigh->dev, 0);
                pi = (struct port_info *)netdev_priv(neigh->dev);
                ep->mtu = dst_mtu(ep->dst);
                ep->tx_chan = cxgb4_port_chan(neigh->dev);
                ep->smac_idx = (cxgb4_port_viid(neigh->dev) &
                                0x7F) << 1;
        }

        step = ep->com.dev->rdev.lldi.ntxq / ep->com.dev->rdev.lldi.nchan;
        ep->txq_idx = pi->port_id * step;
        ep->ctrlq_idx = pi->port_id;
        step = ep->com.dev->rdev.lldi.nrxq / ep->com.dev->rdev.lldi.nchan;
        ep->rss_qid = ep->com.dev->rdev.lldi.rxq_ids[pi->port_id * step];

        if (!ep->l2t) {
                pr_err("%s - cannot alloc l2e.\n", __func__);
                err = -ENOMEM;
                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:
        remove_handle(ep->com.dev, &ep->com.dev->atid_idr, ep->atid);
        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 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;
        }

        set_bit(ACT_OPEN_RPL, &ep->com.history);

        /*
         * Log interesting failures.
         */
        switch (status) {
        case CPL_ERR_CONN_RESET:
        case CPL_ERR_CONN_TIMEDOUT:
                break;
        case CPL_ERR_TCAM_FULL:
                dev->rdev.stats.tcam_full++;
                if (dev->rdev.lldi.enable_fw_ofld_conn) {
                        mutex_lock(&dev->rdev.stats.lock);
                        mutex_unlock(&dev->rdev.stats.lock);
                        send_fw_act_open_req(ep,
                                             GET_TID_TID(GET_AOPEN_ATID(
                                             ntohl(rpl->atid_status))));
                        return 0;
                }
                break;
        case CPL_ERR_CONN_EXIST:
                if (ep->retry_count++ < ACT_OPEN_RETRY_COUNT) {
                        set_bit(ACT_RETRY_INUSE, &ep->com.history);
                        remove_handle(ep->com.dev, &ep->com.dev->atid_idr,
                                        atid);
                        cxgb4_free_atid(t, atid);
                        dst_release(ep->dst);
                        cxgb4_l2t_release(ep->l2t);
                        c4iw_reconnect(ep);
                        return 0;
                }
                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));

        remove_handle(ep->com.dev, &ep->com.dev->atid_idr, atid);
        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) {
                PDBG("%s stid %d lookup failure!\n", __func__, stid);
                goto out;
        }
        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));

out:
        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 = (nocong ? NO_CONG(1) : 0) |
               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 >> 2) |
               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);
        if (enable_ecn) {
                const struct tcphdr *tcph;
                u32 hlen = ntohl(req->hdr_len);

                tcph = (const void *)(req + 1) + G_ETH_HDR_LEN(hlen) +
                        G_IP_HDR_LEN(hlen);
                if (tcph->ece && tcph->cwr)
                        opt2 |= CCTRL_ECN(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 = NULL, *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 = 0;
        __be16 local_port, peer_port;
        int err;
        u16 peer_mss = ntohs(req->tcpopt.mss);

        parent_ep = lookup_stid(t, stid);
        if (!parent_ep) {
                PDBG("%s connect request on invalid stid %d\n", __func__, stid);
                goto reject;
        }
        get_4tuple(req, &local_ip, &peer_ip, &local_port, &peer_port);

        PDBG("%s parent ep %p hwtid %u laddr 0x%x raddr 0x%x lport %d " \
             "rport %d peer_mss %d\n", __func__, parent_ep, hwtid,
             ntohl(local_ip), ntohl(peer_ip), ntohs(local_port),
             ntohs(peer_port), peer_mss);

        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;
        }

        if (peer_mss && child_ep->mtu > (peer_mss + 40))
                child_ep->mtu = peer_mss + 40;

        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);
        insert_handle(dev, &dev->hwtid_idr, child_ep, child_ep->hwtid);
        accept_cr(child_ep, peer_ip, skb, req);
        set_bit(PASS_ACCEPT_REQ, &child_ep->com.history);
        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);

        PDBG("%s ep %p hwtid %u tcp_opt 0x%02x\n", __func__, ep, tid,
             ntohs(req->tcp_opt));

        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);
        set_bit(PASS_ESTAB, &ep->com.history);

        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);

        set_bit(PEER_CLOSE, &ep->com.history);
        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 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);
        set_bit(PEER_ABORT, &ep->com.history);

        /*
         * 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 == 1 || (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);
        else if (ep->retry_with_mpa_v1) {
                remove_handle(ep->com.dev, &ep->com.dev->hwtid_idr, ep->hwtid);
                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;
        }
        set_bit(ULP_REJECT, &ep->com.history);
        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);

        set_bit(ULP_ACCEPT, &ep->com.history);
        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;
        ref_qp(ep);

        /* 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;
        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);
        ref_qp(ep);
        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;
        }
        insert_handle(dev, &dev->atid_idr, ep, ep->atid);

        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:
        remove_handle(ep->com.dev, &ep->com.dev->atid_idr, ep->atid);
        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.
         */
        if (dev->rdev.lldi.enable_fw_ofld_conn)
                ep->stid = cxgb4_alloc_sftid(dev->rdev.lldi.tids, PF_INET, ep);
        else
                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;
        }
        insert_handle(dev, &dev->stid_idr, ep, ep->stid);
        state_set(&ep->com, LISTEN);
        if (dev->rdev.lldi.enable_fw_ofld_conn) {
                do {
                        err = cxgb4_create_server_filter(
                                ep->com.dev->rdev.lldi.ports[0], ep->stid,
                                ep->com.local_addr.sin_addr.s_addr,
                                ep->com.local_addr.sin_port,
                                0,
                                ep->com.dev->rdev.lldi.rxq_ids[0],
                                0,
                                0);
                        if (err == -EBUSY) {
                                set_current_state(TASK_UNINTERRUPTIBLE);
                                schedule_timeout(usecs_to_jiffies(100));
                        }
                } while (err == -EBUSY);
        } else {
                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,
                                0,
                                ep->com.dev->rdev.lldi.rxq_ids[0]);
                if (!err)
                        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;
        }
        pr_err("%s cxgb4_create_server/filter failed err %d " \
               "stid %d laddr %08x lport %d\n", \
               __func__, err, ep->stid,
               ntohl(ep->com.local_addr.sin_addr.s_addr),
               ntohs(ep->com.local_addr.sin_port));
        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);
        if (ep->com.dev->rdev.lldi.enable_fw_ofld_conn) {
                err = cxgb4_remove_server_filter(
                        ep->com.dev->rdev.lldi.ports[0], ep->stid,
                        ep->com.dev->rdev.lldi.rxq_ids[0], 0);
        } else {
                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__);
        }
        remove_handle(ep->com.dev, &ep->com.dev->stid_idr, ep->stid);
        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) {
                        set_bit(EP_DISC_ABORT, &ep->com.history);
                        close_complete_upcall(ep);
                        ret = send_abort(ep, NULL, gfp);
                } else {
                        set_bit(EP_DISC_CLOSE, &ep->com.history);
                        ret = send_halfclose(ep, gfp);
                }
                if (ret)
                        fatal = 1;
        }
        mutex_unlock(&ep->com.mutex);
        if (fatal)
                release_ep_resources(ep);
        return ret;
}

static void active_ofld_conn_reply(struct c4iw_dev *dev, struct sk_buff *skb,
                        struct cpl_fw6_msg_ofld_connection_wr_rpl *req)
{
        struct c4iw_ep *ep;
        int atid = be32_to_cpu(req->tid);

        ep = (struct c4iw_ep *)lookup_atid(dev->rdev.lldi.tids,
                                           (__force u32) req->tid);
        if (!ep)
                return;

        switch (req->retval) {
        case FW_ENOMEM:
                set_bit(ACT_RETRY_NOMEM, &ep->com.history);
                if (ep->retry_count++ < ACT_OPEN_RETRY_COUNT) {
                        send_fw_act_open_req(ep, atid);
                        return;
                }
        case FW_EADDRINUSE:
                set_bit(ACT_RETRY_INUSE, &ep->com.history);
                if (ep->retry_count++ < ACT_OPEN_RETRY_COUNT) {
                        send_fw_act_open_req(ep, atid);
                        return;
                }
                break;
        default:
                pr_info("%s unexpected ofld conn wr retval %d\n",
                       __func__, req->retval);
                break;
        }
        pr_err("active ofld_connect_wr failure %d atid %d\n",
               req->retval, atid);
        mutex_lock(&dev->rdev.stats.lock);
        dev->rdev.stats.act_ofld_conn_fails++;
        mutex_unlock(&dev->rdev.stats.lock);
        connect_reply_upcall(ep, status2errno(req->retval));
        state_set(&ep->com, DEAD);
        remove_handle(dev, &dev->atid_idr, atid);
        cxgb4_free_atid(dev->rdev.lldi.tids, atid);
        dst_release(ep->dst);
        cxgb4_l2t_release(ep->l2t);
        c4iw_put_ep(&ep->com);
}

static void passive_ofld_conn_reply(struct c4iw_dev *dev, struct sk_buff *skb,
                        struct cpl_fw6_msg_ofld_connection_wr_rpl *req)
{
        struct sk_buff *rpl_skb;
        struct cpl_pass_accept_req *cpl;
        int ret;

        rpl_skb = (struct sk_buff *)(unsigned long)req->cookie;
        BUG_ON(!rpl_skb);
        if (req->retval) {
                PDBG("%s passive open failure %d\n", __func__, req->retval);
                mutex_lock(&dev->rdev.stats.lock);
                dev->rdev.stats.pas_ofld_conn_fails++;
                mutex_unlock(&dev->rdev.stats.lock);
                kfree_skb(rpl_skb);
        } else {
                cpl = (struct cpl_pass_accept_req *)cplhdr(rpl_skb);
                OPCODE_TID(cpl) = htonl(MK_OPCODE_TID(CPL_PASS_ACCEPT_REQ,
                                        (__force u32) htonl(
                                        (__force u32) req->tid)));
                ret = pass_accept_req(dev, rpl_skb);
                if (!ret)
                        kfree_skb(rpl_skb);
        }
        return;
}

static int deferred_fw6_msg(struct c4iw_dev *dev, struct sk_buff *skb)
{
        struct cpl_fw6_msg *rpl = cplhdr(skb);
        struct cpl_fw6_msg_ofld_connection_wr_rpl *req;

        switch (rpl->type) {
        case FW6_TYPE_CQE:
                c4iw_ev_dispatch(dev, (struct t4_cqe *)&rpl->data[0]);
                break;
        case FW6_TYPE_OFLD_CONNECTION_WR_RPL:
                req = (struct cpl_fw6_msg_ofld_connection_wr_rpl *)rpl->data;
                switch (req->t_state) {
                case TCP_SYN_SENT:
                        active_ofld_conn_reply(dev, skb, req);
                        break;
                case TCP_SYN_RECV:
                        passive_ofld_conn_reply(dev, skb, req);
                        break;
                default:
                        pr_err("%s unexpected ofld conn wr state %d\n",
                               __func__, req->t_state);
                        break;
                }
                break;
        }
        return 0;
}

static void build_cpl_pass_accept_req(struct sk_buff *skb, int stid , u8 tos)
{
        u32 l2info;
        u16 vlantag, len, hdr_len, eth_hdr_len;
        u8 intf;
        struct cpl_rx_pkt *cpl = cplhdr(skb);
        struct cpl_pass_accept_req *req;
        struct tcp_options_received tmp_opt;
        struct c4iw_dev *dev;

        dev = *((struct c4iw_dev **) (skb->cb + sizeof(void *)));
        /* Store values from cpl_rx_pkt in temporary location. */
        vlantag = (__force u16) cpl->vlan;
        len = (__force u16) cpl->len;
        l2info  = (__force u32) cpl->l2info;
        hdr_len = (__force u16) cpl->hdr_len;
        intf = cpl->iff;

        __skb_pull(skb, sizeof(*req) + sizeof(struct rss_header));

        /*
         * We need to parse the TCP options from SYN packet.
         * to generate cpl_pass_accept_req.
         */
        memset(&tmp_opt, 0, sizeof(tmp_opt));
        tcp_clear_options(&tmp_opt);
        tcp_parse_options(skb, &tmp_opt, 0, NULL);

        req = (struct cpl_pass_accept_req *)__skb_push(skb, sizeof(*req));
        memset(req, 0, sizeof(*req));
        req->l2info = cpu_to_be16(V_SYN_INTF(intf) |
                         V_SYN_MAC_IDX(G_RX_MACIDX(
                         (__force int) htonl(l2info))) |
                         F_SYN_XACT_MATCH);
        eth_hdr_len = is_t4(dev->rdev.lldi.adapter_type) ?
                            G_RX_ETHHDR_LEN((__force int) htonl(l2info)) :
                            G_RX_T5_ETHHDR_LEN((__force int) htonl(l2info));
        req->hdr_len = cpu_to_be32(V_SYN_RX_CHAN(G_RX_CHAN(
                                        (__force int) htonl(l2info))) |
                                   V_TCP_HDR_LEN(G_RX_TCPHDR_LEN(
                                        (__force int) htons(hdr_len))) |
                                   V_IP_HDR_LEN(G_RX_IPHDR_LEN(
                                        (__force int) htons(hdr_len))) |
                                   V_ETH_HDR_LEN(G_RX_ETHHDR_LEN(eth_hdr_len)));
        req->vlan = (__force __be16) vlantag;
        req->len = (__force __be16) len;
        req->tos_stid = cpu_to_be32(PASS_OPEN_TID(stid) |
                                    PASS_OPEN_TOS(tos));
        req->tcpopt.mss = htons(tmp_opt.mss_clamp);
        if (tmp_opt.wscale_ok)
                req->tcpopt.wsf = tmp_opt.snd_wscale;
        req->tcpopt.tstamp = tmp_opt.saw_tstamp;
        if (tmp_opt.sack_ok)
                req->tcpopt.sack = 1;
        OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_PASS_ACCEPT_REQ, 0));
        return;
}

static void send_fw_pass_open_req(struct c4iw_dev *dev, struct sk_buff *skb,
                                  __be32 laddr, __be16 lport,
                                  __be32 raddr, __be16 rport,
                                  u32 rcv_isn, u32 filter, u16 window,
                                  u32 rss_qid, u8 port_id)
{
        struct sk_buff *req_skb;
        struct fw_ofld_connection_wr *req;
        struct cpl_pass_accept_req *cpl = cplhdr(skb);

        req_skb = alloc_skb(sizeof(struct fw_ofld_connection_wr), GFP_KERNEL);
        req = (struct fw_ofld_connection_wr *)__skb_put(req_skb, sizeof(*req));
        memset(req, 0, sizeof(*req));
        req->op_compl = htonl(V_WR_OP(FW_OFLD_CONNECTION_WR) | FW_WR_COMPL(1));
        req->len16_pkd = htonl(FW_WR_LEN16(DIV_ROUND_UP(sizeof(*req), 16)));
        req->le.version_cpl = htonl(F_FW_OFLD_CONNECTION_WR_CPL);
        req->le.filter = (__force __be32) filter;
        req->le.lport = lport;
        req->le.pport = rport;
        req->le.u.ipv4.lip = laddr;
        req->le.u.ipv4.pip = raddr;
        req->tcb.rcv_nxt = htonl(rcv_isn + 1);
        req->tcb.rcv_adv = htons(window);
        req->tcb.t_state_to_astid =
                 htonl(V_FW_OFLD_CONNECTION_WR_T_STATE(TCP_SYN_RECV) |
                        V_FW_OFLD_CONNECTION_WR_RCV_SCALE(cpl->tcpopt.wsf) |
                        V_FW_OFLD_CONNECTION_WR_ASTID(
                        GET_PASS_OPEN_TID(ntohl(cpl->tos_stid))));

        /*
         * We store the qid in opt2 which will be used by the firmware
         * to send us the wr response.
         */
        req->tcb.opt2 = htonl(V_RSS_QUEUE(rss_qid));

        /*
         * We initialize the MSS index in TCB to 0xF.
         * So that when driver sends cpl_pass_accept_rpl
         * TCB picks up the correct value. If this was 0
         * TP will ignore any value > 0 for MSS index.
         */
        req->tcb.opt0 = cpu_to_be64(V_MSS_IDX(0xF));
        req->cookie = (unsigned long)skb;

        set_wr_txq(req_skb, CPL_PRIORITY_CONTROL, port_id);