/*
 * Copyright (c) 2009-2014 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 <net/ip6_route.h>
#include <net/addrconf.h>

#include <rdma/ib_addr.h>

#include "iw_cxgb4.h"
#include "clip_tbl.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)");

uint c4iw_max_read_depth = 32;
module_param(c4iw_max_read_depth, int, 0644);
MODULE_PARM_DESC(c4iw_max_read_depth,
                 "Per-connection max ORD/IRD (default=32)");

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 = 1;
module_param(peer2peer, int, 0644);
MODULE_PARM_DESC(peer2peer, "Support peer2peer ULPs (default=1)");

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 = 2;
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=2)");

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 int 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);
                return 0;
        }
        return 1;
}

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[TCPOPT_MSS_G(opt)] -
                   ((AF_INET == ep->com.remote_addr.ss_family) ?
                    sizeof(struct iphdr) : sizeof(struct ipv6hdr)) -
                   sizeof(struct tcphdr);
        ep->mss = ep->emss;
        if (TCPOPT_TSTAMP_G(opt))
                ep->emss -= round_up(TCPOLEN_TIMESTAMP, 4);
        if (ep->emss < 128)
                ep->emss = 128;
        if (ep->emss & 7)
                PDBG("Warning: misaligned mtu idx %u mss %u emss=%u\n",
                     TCPOPT_MSS_G(opt), ep->mss, ep->emss);
        PDBG("%s mss_idx %u mss %u emss=%u\n", __func__, TCPOPT_MSS_G(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)) {
                if (ep->com.remote_addr.ss_family == AF_INET6) {
                        struct sockaddr_in6 *sin6 =
                                        (struct sockaddr_in6 *)
                                        &ep->com.mapped_local_addr;

                        cxgb4_clip_release(
                                        ep->com.dev->rdev.lldi.ports[0],
                                        (const u32 *)&sin6->sin6_addr.s6_addr,
                                        1);
                }
                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);
        }
        if (test_bit(RELEASE_MAPINFO, &ep->com.flags)) {
                print_addr(&ep->com, __func__, "remove_mapinfo/mapping");
                iwpm_remove_mapinfo(&ep->com.local_addr,
                                    &ep->com.mapped_local_addr);
                iwpm_remove_mapping(&ep->com.local_addr, RDMA_NL_C4IW);
        }
        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);
        }
        t4_set_arp_err_handler(skb, NULL, NULL);
        return skb;
}

static struct net_device *get_real_dev(struct net_device *egress_dev)
{
        return rdma_vlan_dev_real_dev(egress_dev) ? : egress_dev;
}

static int our_interface(struct c4iw_dev *dev, struct net_device *egress_dev)
{
        int i;

        egress_dev = get_real_dev(egress_dev);
        for (i = 0; i < dev->rdev.lldi.nports; i++)
                if (dev->rdev.lldi.ports[i] == egress_dev)
                        return 1;
        return 0;
}

static struct dst_entry *find_route6(struct c4iw_dev *dev, __u8 *local_ip,
                                     __u8 *peer_ip, __be16 local_port,
                                     __be16 peer_port, u8 tos,
                                     __u32 sin6_scope_id)
{
        struct dst_entry *dst = NULL;

        if (IS_ENABLED(CONFIG_IPV6)) {
                struct flowi6 fl6;

                memset(&fl6, 0, sizeof(fl6));
                memcpy(&fl6.daddr, peer_ip, 16);
                memcpy(&fl6.saddr, local_ip, 16);
                if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL)
                        fl6.flowi6_oif = sin6_scope_id;
                dst = ip6_route_output(&init_net, NULL, &fl6);
                if (!dst)
                        goto out;
                if (!our_interface(dev, ip6_dst_idev(dst)->dev) &&
                    !(ip6_dst_idev(dst)->dev->flags & IFF_LOOPBACK)) {
                        dst_release(dst);
                        dst = NULL;
                }
        }

out:
        return dst;
}

static struct dst_entry *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;
        struct neighbour *n;

        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;
        n = dst_neigh_lookup(&rt->dst, &peer_ip);
        if (!n)
                return NULL;
        if (!our_interface(dev, n->dev) &&
            !(n->dev->flags & IFF_LOOPBACK)) {
                neigh_release(n);
                dst_release(&rt->dst);
                return NULL;
        }
        neigh_release(n);
        return &rt->dst;
}

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)
{
        struct c4iw_ep *ep = handle;

        printk(KERN_ERR MOD "ARP failure duing connect\n");
        kfree_skb(skb);
        connect_reply_upcall(ep, -EHOSTUNREACH);
        state_set(&ep->com, DEAD);
        if (ep->com.remote_addr.ss_family == AF_INET6) {
                struct sockaddr_in6 *sin6 =
                        (struct sockaddr_in6 *)&ep->com.mapped_local_addr;
                cxgb4_clip_release(ep->com.dev->rdev.lldi.ports[0],
                                   (const u32 *)&sin6->sin6_addr.s6_addr, 1);
        }
        remove_handle(ep->com.dev, &ep->com.dev->atid_idr, ep->atid);
        cxgb4_free_atid(ep->com.dev->rdev.lldi.tids, ep->atid);
        dst_release(ep->dst);
        cxgb4_l2t_release(ep->l2t);
        c4iw_put_ep(&ep->com);
}

/*
 * 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_V(FW_FLOWC_WR) |
                                           FW_FLOWC_WR_NPARAMS_V(8));
        flowc->flowid_len16 = cpu_to_be32(FW_WR_LEN16_V(DIV_ROUND_UP(flowclen,
                                          16)) | FW_WR_FLOWID_V(ep->hwtid));

        flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
        flowc->mnemval[0].val = cpu_to_be32(FW_PFVF_CMD_PFN_V
                                            (ep->com.dev->rdev.lldi.pf));
        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(ep->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);
}

/*
 * c4iw_form_pm_msg - Form a port mapper message with mapping info
 */
static void c4iw_form_pm_msg(struct c4iw_ep *ep,
                                struct iwpm_sa_data *pm_msg)
{
        memcpy(&pm_msg->loc_addr, &ep->com.local_addr,
                sizeof(ep->com.local_addr));
        memcpy(&pm_msg->rem_addr, &ep->com.remote_addr,
                sizeof(ep->com.remote_addr));
}

/*
 * c4iw_form_reg_msg - Form a port mapper message with dev info
 */
static void c4iw_form_reg_msg(struct c4iw_dev *dev,
                                struct iwpm_dev_data *pm_msg)
{
        memcpy(pm_msg->dev_name, dev->ibdev.name, IWPM_DEVNAME_SIZE);
        memcpy(pm_msg->if_name, dev->rdev.lldi.ports[0]->name,
                                IWPM_IFNAME_SIZE);
}

static void c4iw_record_pm_msg(struct c4iw_ep *ep,
                        struct iwpm_sa_data *pm_msg)
{
        memcpy(&ep->com.mapped_local_addr, &pm_msg->mapped_loc_addr,
                sizeof(ep->com.mapped_local_addr));
        memcpy(&ep->com.mapped_remote_addr, &pm_msg->mapped_rem_addr,
                sizeof(ep->com.mapped_remote_addr));
}

static int get_remote_addr(struct c4iw_ep *parent_ep, struct c4iw_ep *child_ep)
{
        int ret;

        print_addr(&parent_ep->com, __func__, "get_remote_addr parent_ep ");
        print_addr(&child_ep->com, __func__, "get_remote_addr child_ep ");

        ret = iwpm_get_remote_info(&parent_ep->com.mapped_local_addr,
                                   &child_ep->com.mapped_remote_addr,
                                   &child_ep->com.remote_addr, RDMA_NL_C4IW);
        if (ret)
                PDBG("Unable to find remote peer addr info - err %d\n", ret);

        return ret;
}

static void best_mtu(const unsigned short *mtus, unsigned short mtu,
                     unsigned int *idx, int use_ts, int ipv6)
{
        unsigned short hdr_size = (ipv6 ?
                                   sizeof(struct ipv6hdr) :
                                   sizeof(struct iphdr)) +
                                  sizeof(struct tcphdr) +
                                  (use_ts ?
                                   round_up(TCPOLEN_TIMESTAMP, 4) : 0);
        unsigned short data_size = mtu - hdr_size;

        cxgb4_best_aligned_mtu(mtus, hdr_size, data_size, 8, idx);
}

static int send_connect(struct c4iw_ep *ep)
{
        struct cpl_act_open_req *req = NULL;
        struct cpl_t5_act_open_req *t5req = NULL;
        struct cpl_t6_act_open_req *t6req = NULL;
        struct cpl_act_open_req6 *req6 = NULL;
        struct cpl_t5_act_open_req6 *t5req6 = NULL;
        struct cpl_t6_act_open_req6 *t6req6 = NULL;
        struct sk_buff *skb;
        u64 opt0;
        u32 opt2;
        unsigned int mtu_idx;
        int wscale;
        int win, sizev4, sizev6, wrlen;
        struct sockaddr_in *la = (struct sockaddr_in *)
                                 &ep->com.mapped_local_addr;
        struct sockaddr_in *ra = (struct sockaddr_in *)
                                 &ep->com.mapped_remote_addr;
        struct sockaddr_in6 *la6 = (struct sockaddr_in6 *)
                                   &ep->com.mapped_local_addr;
        struct sockaddr_in6 *ra6 = (struct sockaddr_in6 *)
                                   &ep->com.mapped_remote_addr;
        int ret;
        enum chip_type adapter_type = ep->com.dev->rdev.lldi.adapter_type;
        u32 isn = (prandom_u32() & ~7UL) - 1;

        switch (CHELSIO_CHIP_VERSION(adapter_type)) {
        case CHELSIO_T4:
                sizev4 = sizeof(struct cpl_act_open_req);
                sizev6 = sizeof(struct cpl_act_open_req6);
                break;
        case CHELSIO_T5:
                sizev4 = sizeof(struct cpl_t5_act_open_req);
                sizev6 = sizeof(struct cpl_t5_act_open_req6);
                break;
        case CHELSIO_T6:
                sizev4 = sizeof(struct cpl_t6_act_open_req);
                sizev6 = sizeof(struct cpl_t6_act_open_req6);
                break;
        default:
                pr_err("T%d Chip is not supported\n",
                       CHELSIO_CHIP_VERSION(adapter_type));
                return -EINVAL;
        }

        wrlen = (ep->com.remote_addr.ss_family == AF_INET) ?
                        roundup(sizev4, 16) :
                        roundup(sizev6, 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);

        best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx,
                 enable_tcp_timestamps,
                 (AF_INET == ep->com.remote_addr.ss_family) ? 0 : 1);
        wscale = compute_wscale(rcv_win);

        /*
         * Specify the largest window that will fit in opt0. The
         * remainder will be specified in the rx_data_ack.
         */
        win = ep->rcv_win >> 10;
        if (win > RCV_BUFSIZ_M)
                win = RCV_BUFSIZ_M;

        opt0 = (nocong ? NO_CONG_F : 0) |
               KEEP_ALIVE_F |
               DELACK_F |
               WND_SCALE_V(wscale) |
               MSS_IDX_V(mtu_idx) |
               L2T_IDX_V(ep->l2t->idx) |
               TX_CHAN_V(ep->tx_chan) |
               SMAC_SEL_V(ep->smac_idx) |
               DSCP_V(ep->tos) |
               ULP_MODE_V(ULP_MODE_TCPDDP) |
               RCV_BUFSIZ_V(win);
        opt2 = RX_CHANNEL_V(0) |
               CCTRL_ECN_V(enable_ecn) |
               RSS_QUEUE_VALID_F | RSS_QUEUE_V(ep->rss_qid);
        if (enable_tcp_timestamps)
                opt2 |= TSTAMPS_EN_F;
        if (enable_tcp_sack)
                opt2 |= SACK_EN_F;
        if (wscale && enable_tcp_window_scaling)
                opt2 |= WND_SCALE_EN_F;
        if (CHELSIO_CHIP_VERSION(adapter_type) > CHELSIO_T4) {
                if (peer2peer)
                        isn += 4;

                opt2 |= T5_OPT_2_VALID_F;
                opt2 |= CONG_CNTRL_V(CONG_ALG_TAHOE);
                opt2 |= T5_ISS_F;
        }

        if (ep->com.remote_addr.ss_family == AF_INET6)
                cxgb4_clip_get(ep->com.dev->rdev.lldi.ports[0],
                               (const u32 *)&la6->sin6_addr.s6_addr, 1);

        t4_set_arp_err_handler(skb, ep, act_open_req_arp_failure);

        if (ep->com.remote_addr.ss_family == AF_INET) {
                switch (CHELSIO_CHIP_VERSION(adapter_type)) {
                case CHELSIO_T4:
                        req = (struct cpl_act_open_req *)skb_put(skb, wrlen);
                        INIT_TP_WR(req, 0);
                        break;
                case CHELSIO_T5:
                        t5req = (struct cpl_t5_act_open_req *)skb_put(skb,
                                        wrlen);
                        INIT_TP_WR(t5req, 0);
                        req = (struct cpl_act_open_req *)t5req;
                        break;
                case CHELSIO_T6:
                        t6req = (struct cpl_t6_act_open_req *)skb_put(skb,
                                        wrlen);
                        INIT_TP_WR(t6req, 0);
                        req = (struct cpl_act_open_req *)t6req;
                        t5req = (struct cpl_t5_act_open_req *)t6req;
                        break;
                default:
                        pr_err("T%d Chip is not supported\n",
                               CHELSIO_CHIP_VERSION(adapter_type));
                        ret = -EINVAL;
                        goto clip_release;
                }

                OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
                                        ((ep->rss_qid<<14) | ep->atid)));
                req->local_port = la->sin_port;
                req->peer_port = ra->sin_port;
                req->local_ip = la->sin_addr.s_addr;
                req->peer_ip = ra->sin_addr.s_addr;
                req->opt0 = cpu_to_be64(opt0);

                if (is_t4(ep->com.dev->rdev.lldi.adapter_type)) {
                        req->params = cpu_to_be32(cxgb4_select_ntuple(
                                                ep->com.dev->rdev.lldi.ports[0],
                                                ep->l2t));
                        req->opt2 = cpu_to_be32(opt2);
                } else {
                        t5req->params = cpu_to_be64(FILTER_TUPLE_V(
                                                cxgb4_select_ntuple(
                                                ep->com.dev->rdev.lldi.ports[0],
                                                ep->l2t)));
                        t5req->rsvd = cpu_to_be32(isn);
                        PDBG("%s snd_isn %u\n", __func__, t5req->rsvd);
                        t5req->opt2 = cpu_to_be32(opt2);
                }
        } else {
                switch (CHELSIO_CHIP_VERSION(adapter_type)) {
                case CHELSIO_T4:
                        req6 = (struct cpl_act_open_req6 *)skb_put(skb, wrlen);
                        INIT_TP_WR(req6, 0);
                        break;
                case CHELSIO_T5:
                        t5req6 = (struct cpl_t5_act_open_req6 *)skb_put(skb,
                                        wrlen);
                        INIT_TP_WR(t5req6, 0);
                        req6 = (struct cpl_act_open_req6 *)t5req6;
                        break;
                case CHELSIO_T6:
                        t6req6 = (struct cpl_t6_act_open_req6 *)skb_put(skb,
                                        wrlen);
                        INIT_TP_WR(t6req6, 0);
                        req6 = (struct cpl_act_open_req6 *)t6req6;
                        t5req6 = (struct cpl_t5_act_open_req6 *)t6req6;
                        break;
                default:
                        pr_err("T%d Chip is not supported\n",
                               CHELSIO_CHIP_VERSION(adapter_type));
                        ret = -EINVAL;
                        goto clip_release;
                }

                OPCODE_TID(req6) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
                                        ((ep->rss_qid<<14)|ep->atid)));
                req6->local_port = la6->sin6_port;
                req6->peer_port = ra6->sin6_port;
                req6->local_ip_hi = *((__be64 *)(la6->sin6_addr.s6_addr));
                req6->local_ip_lo = *((__be64 *)(la6->sin6_addr.s6_addr + 8));
                req6->peer_ip_hi = *((__be64 *)(ra6->sin6_addr.s6_addr));
                req6->peer_ip_lo = *((__be64 *)(ra6->sin6_addr.s6_addr + 8));
                req6->opt0 = cpu_to_be64(opt0);

                if (is_t4(ep->com.dev->rdev.lldi.adapter_type)) {
                        req6->params = cpu_to_be32(cxgb4_select_ntuple(
                                                ep->com.dev->rdev.lldi.ports[0],
                                                ep->l2t));
                        req6->opt2 = cpu_to_be32(opt2);
                } else {
                        t5req6->params = cpu_to_be64(FILTER_TUPLE_V(
                                                cxgb4_select_ntuple(
                                                ep->com.dev->rdev.lldi.ports[0],
                                                ep->l2t)));
                        t5req6->rsvd = cpu_to_be32(isn);
                        PDBG("%s snd_isn %u\n", __func__, t5req6->rsvd);
                        t5req6->opt2 = cpu_to_be32(opt2);
                }
        }

        set_bit(ACT_OPEN_REQ, &ep->com.history);
        ret = c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
clip_release:
        if (ret && ep->com.remote_addr.ss_family == AF_INET6)
                cxgb4_clip_release(ep->com.dev->rdev.lldi.ports[0],
                                   (const u32 *)&la6->sin6_addr.s6_addr, 1);
        return ret;
}

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_V(FW_OFLD_TX_DATA_WR) |
                FW_WR_COMPL_F |
                FW_WR_IMMDLEN_V(mpalen));
        req->flowid_len16 = cpu_to_be32(
                FW_WR_FLOWID_V(ep->hwtid) |
                FW_WR_LEN16_V(wrlen >> 4));
        req->plen = cpu_to_be32(mpalen);
        req->tunnel_to_proxy = cpu_to_be32(
                FW_OFLD_TX_DATA_WR_FLUSH_F |
                FW_OFLD_TX_DATA_WR_SHOVE_F);

        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));
                PDBG("%s initiator ird %u ord %u\n", __func__, ep->ird,
                     ep->ord);
                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;
        ep->snd_seq += mpalen;
        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_V(FW_OFLD_TX_DATA_WR) |
                FW_WR_COMPL_F |
                FW_WR_IMMDLEN_V(mpalen));
        req->flowid_len16 = cpu_to_be32(
                FW_WR_FLOWID_V(ep->hwtid) |
                FW_WR_LEN16_V(wrlen >> 4));
        req->plen = cpu_to_be32(mpalen);
        req->tunnel_to_proxy = cpu_to_be32(
                FW_OFLD_TX_DATA_WR_FLUSH_F |
                FW_OFLD_TX_DATA_WR_SHOVE_F);

        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;
        ep->snd_seq += mpalen;
        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_V(FW_OFLD_TX_DATA_WR) |
                FW_WR_COMPL_F |
                FW_WR_IMMDLEN_V(mpalen));
        req->flowid_len16 = cpu_to_be32(
                FW_WR_FLOWID_V(ep->hwtid) |
                FW_WR_LEN16_V(wrlen >> 4));
        req->plen = cpu_to_be32(mpalen);
        req->tunnel_to_proxy = cpu_to_be32(
                FW_OFLD_TX_DATA_WR_FLUSH_F |
                FW_OFLD_TX_DATA_WR_SHOVE_F);

        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);
        ep->snd_seq += mpalen;
        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 = TID_TID_G(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));

        mutex_lock(&ep->com.mutex);
        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);
        mutex_unlock(&ep->com.mutex);
        return 0;
}

static void close_complete_upcall(struct c4iw_ep *ep, int status)
{
        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 = status;
        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);
        __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;
        memcpy(&event.local_addr, &ep->com.local_addr,
               sizeof(ep->com.local_addr));
        memcpy(&event.remote_addr, &ep->com.remote_addr,
               sizeof(ep->com.remote_addr));

        if ((status == 0) || (status == -ECONNREFUSED)) {
                if (!ep->tried_with_mpa_v1) {
                        /* this means MPA_v2 is used */
                        event.ord = ep->ird;
                        event.ird = ep->ord;
                        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.ord = cur_max_read_depth(ep->com.dev);
                        event.ird = cur_max_read_depth(ep->com.dev);
                        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 int connect_request_upcall(struct c4iw_ep *ep)
{
        struct iw_cm_event event;
        int ret;

        PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);
        memset(&event, 0, sizeof(event));
        event.event = IW_CM_EVENT_CONNECT_REQUEST;
        memcpy(&event.local_addr, &ep->com.local_addr,
               sizeof(ep->com.local_addr));
        memcpy(&event.remote_addr, &ep->com.remote_addr,
               sizeof(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 = cur_max_read_depth(ep->com.dev);
                event.ird = cur_max_read_depth(ep->com.dev);
                event.private_data_len = ep->plen;
                event.private_data = ep->mpa_pkt + sizeof(struct mpa_message);
        }
        c4iw_get_ep(&ep->com);
        ret = ep->parent_ep->com.cm_id->event_handler(ep->parent_ep->com.cm_id,
                                                      &event);
        if (ret)
                c4iw_put_ep(&ep->com);
        set_bit(CONNREQ_UPCALL, &ep->com.history);
        c4iw_put_ep(&ep->parent_ep->com);
        return ret;
}

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->ord;
        event.ord = ep->ird;
        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;
        }

        /*
         * If we couldn't specify the entire rcv window at connection setup
         * due to the limit in the number of bits in the RCV_BUFSIZ field,
         * then add the overage in to the credits returned.
         */
        if (ep->rcv_win > RCV_BUFSIZ_M * 1024)
                credits += ep->rcv_win - RCV_BUFSIZ_M * 1024;

        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_F |
                                       RX_DACK_CHANGE_F |
                                       RX_DACK_MODE_V(dack_mode));
        set_wr_txq(skb, CPL_PRIORITY_ACK, ep->ctrlq_idx);
        c4iw_ofld_send(&ep->com.dev->rdev, skb);
        return credits;
}

#define RELAXED_IRD_NEGOTIATION 1

static int 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;
        int disconnect = 0;

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

        /*
         * Stop mpa timer.  If it expired, then
         * we ignore the MPA reply.  process_timeout()
         * will abort the connection.
         */
        if (stop_ep_timer(ep))
                return 0;

        /*
         * 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 0;
        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 0;

        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;
                        PDBG("%s responder ird %u ord %u ep ird %u ord %u\n",
                             __func__, resp_ird, resp_ord, ep->ird, ep->ord);

                        /*
                         * 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) {
                                if (RELAXED_IRD_NEGOTIATION && resp_ord <=
                                    ep->com.dev->rdev.lldi.max_ordird_qp)
                                        ep->ird = resp_ord;
                                else
                                        insuff_ird = 1;
                        } else if (ep->ird > resp_ord) {
                                ep->ird = resp_ord;
                        }
                        if (ep->ord > resp_ird) {
                                if (RELAXED_IRD_NEGOTIATION)
                                        ep->ord = resp_ird;
                                else
                                        insuff_ird = 1;
                        }
                        if (insuff_ird) {
                                err = -ENOMEM;
                                ep->ird = resp_ord;
                                ep->ord = resp_ird;
                        }

                        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;
                attrs.send_term = 1;
                err = c4iw_modify_qp(ep->com.qp->rhp, ep->com.qp,
                                C4IW_QP_ATTR_NEXT_STATE, &attrs, 1);
                err = -ENOMEM;
                disconnect = 1;
                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;
                attrs.send_term = 1;
                err = c4iw_modify_qp(ep->com.qp->rhp, ep->com.qp,
                                C4IW_QP_ATTR_NEXT_STATE, &attrs, 1);
                err = -ENOMEM;
                disconnect = 1;
                goto out;
        }
        goto out;
err:
        __state_set(&ep->com, ABORTING);
        send_abort(ep, skb, GFP_KERNEL);
out:
        connect_reply_upcall(ep, err);
        return disconnect;
}

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 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)) {
                (void)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__);
        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);
                (void)stop_ep_timer(ep);
                abort_connection(ep, skb, GFP_KERNEL);
                return;
        }

        if (memcmp(mpa->key, MPA_KEY_REQ, sizeof(mpa->key))) {
                (void)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) {
                (void)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)) {
                (void)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;
                        PDBG("%s initiator ird %u ord %u\n", __func__, ep->ird,
                             ep->ord);
                        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);

        /*
         * If the endpoint timer already expired, then we ignore
         * the start request.  process_timeout() will abort
         * the connection.
         */
        if (!stop_ep_timer(ep)) {
                __state_set(&ep->com, MPA_REQ_RCVD);

                /* drive upcall */
                mutex_lock_nested(&ep->parent_ep->com.mutex,
                                  SINGLE_DEPTH_NESTING);
                if (ep->parent_ep->com.state != DEAD) {
                        if (connect_request_upcall(ep))
                                abort_connection(ep, skb, GFP_KERNEL);
                } else {
                        abort_connection(ep, skb, GFP_KERNEL);
                }
                mutex_unlock(&ep->parent_ep->com.mutex);
        }
        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;
        int disconnect = 0;

        ep = lookup_tid(t, tid);
        if (!ep)
                return 0;
        PDBG("%s ep %p tid %u dlen %u\n", __func__, ep, ep->hwtid, dlen);
        skb_pull(skb, sizeof(*hdr));
        skb_trim(skb, dlen);
        mutex_lock(&ep->com.mutex);

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

        switch (ep->com.state) {
        case MPA_REQ_SENT:
                ep->rcv_seq += dlen;
                disconnect = 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,
                               ep->com.state, ep->hwtid, status);
                attrs.next_state = C4IW_QP_STATE_TERMINATE;
                c4iw_modify_qp(ep->com.qp->rhp, ep->com.qp,
                               C4IW_QP_ATTR_NEXT_STATE, &attrs, 1);
                disconnect = 1;
                break;
        }
        default:
                break;
        }
        mutex_unlock(&ep->com.mutex);
        if (disconnect)
                c4iw_ep_disconnect(ep, 0, GFP_KERNEL);
        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;
        struct sockaddr_in *sin;
        int win;

        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(WR_OP_V(FW_OFLD_CONNECTION_WR));
        req->len16_pkd = htonl(FW_WR_LEN16_V(DIV_ROUND_UP(sizeof(*req), 16)));
        req->le.filter = cpu_to_be32(cxgb4_select_ntuple(
                                     ep->com.dev->rdev.lldi.ports[0],
                                     ep->l2t));
        sin = (struct sockaddr_in *)&ep->com.mapped_local_addr;
        req->le.lport = sin->sin_port;
        req->le.u.ipv4.lip = sin->sin_addr.s_addr;
        sin = (struct sockaddr_in *)&ep->com.mapped_remote_addr;
        req->le.pport = sin->sin_port;
        req->le.u.ipv4.pip = sin->sin_addr.s_addr;
        req->tcb.t_state_to_astid =
                        htonl(FW_OFLD_CONNECTION_WR_T_STATE_V(TCP_SYN_SENT) |
                        FW_OFLD_CONNECTION_WR_ASTID_V(atid));
        req->tcb.cplrxdataack_cplpassacceptrpl =
                        htons(FW_OFLD_CONNECTION_WR_CPLRXDATAACK_F);
        req->tcb.tx_max = (__force __be32) jiffies;
        req->tcb.rcv_adv = htons(1);
        best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx,
                 enable_tcp_timestamps,
                 (AF_INET == ep->com.remote_addr.ss_family) ? 0 : 1);
        wscale = compute_wscale(rcv_win);

        /*
         * Specify the largest window that will fit in opt0. The
         * remainder will be specified in the rx_data_ack.
         */
        win = ep->rcv_win >> 10;
        if (win > RCV_BUFSIZ_M)
                win = RCV_BUFSIZ_M;

        req->tcb.opt0 = (__force __be64) (TCAM_BYPASS_F |
                (nocong ? NO_CONG_F : 0) |
                KEEP_ALIVE_F |
                DELACK_F |
                WND_SCALE_V(wscale) |
                MSS_IDX_V(mtu_idx) |
                L2T_IDX_V(ep->l2t->idx) |
                TX_CHAN_V(ep->tx_chan) |
                SMAC_SEL_V(ep->smac_idx) |
                DSCP_V(ep->tos) |
                ULP_MODE_V(ULP_MODE_TCPDDP) |
                RCV_BUFSIZ_V(win));
        req->tcb.opt2 = (__force __be32) (PACE_V(1) |
                TX_QUEUE_V(ep->com.dev->rdev.lldi.tx_modq[ep->tx_chan]) |
                RX_CHANNEL_V(0) |
                CCTRL_ECN_V(enable_ecn) |
                RSS_QUEUE_VALID_F | RSS_QUEUE_V(ep->rss_qid));
        if (enable_tcp_timestamps)
                req->tcb.opt2 |= (__force __be32)TSTAMPS_EN_F;
        if (enable_tcp_sack)
                req->tcb.opt2 |= (__force __be32)SACK_EN_F;
        if (wscale && enable_tcp_window_scaling)
                req->tcb.opt2 |= (__force __be32)WND_SCALE_EN_F;
        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;
}

/* Returns whether a CPL status conveys negative advice.
 */
static int is_neg_adv(unsigned int status)
{
        return status == CPL_ERR_RTX_NEG_ADVICE ||
               status == CPL_ERR_PERSIST_NEG_ADVICE ||
               status == CPL_ERR_KEEPALV_NEG_ADVICE;
}

static char *neg_adv_str(unsigned int status)
{
        switch (status) {
        case CPL_ERR_RTX_NEG_ADVICE:
                return "Retransmit timeout";
        case CPL_ERR_PERSIST_NEG_ADVICE:
                return "Persist timeout";
        case CPL_ERR_KEEPALV_NEG_ADVICE:
                return "Keepalive timeout";
        default:
                return "Unknown";
        }
}

static void set_tcp_window(struct c4iw_ep *ep, struct port_info *pi)
{
        ep->snd_win = snd_win;
        ep->rcv_win = rcv_win;
        PDBG("%s snd_win %d rcv_win %d\n", __func__, ep->snd_win, ep->rcv_win);
}

#define ACT_OPEN_RETRY_COUNT 2

static int import_ep(struct c4iw_ep *ep, int iptype, __u8 *peer_ip,
                     struct dst_entry *dst, struct c4iw_dev *cdev,
                     bool clear_mpa_v1, enum chip_type adapter_type)
{
        struct neighbour *n;
        int err, step;
        struct net_device *pdev;

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

        rcu_read_lock();
        err = -ENOMEM;
        if (n->dev->flags & IFF_LOOPBACK) {
                if (iptype == 4)
                        pdev = ip_dev_find(&init_net, *(__be32 *)peer_ip);
                else if (IS_ENABLED(CONFIG_IPV6))
                        for_each_netdev(&init_net, pdev) {
                                if (ipv6_chk_addr(&init_net,
                                                  (struct in6_addr *)peer_ip,
                                                  pdev, 1))
                                        break;
                        }
                else
                        pdev = NULL;

                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_tp_smt_idx(adapter_type,
                                                cxgb4_port_viid(pdev));
                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];
                set_tcp_window(ep, (struct port_info *)netdev_priv(pdev));
                dev_put(pdev);
        } else {
                pdev = get_real_dev(n->dev);
                ep->l2t = cxgb4_l2t_get(cdev->rdev.lldi.l2t,
                                        n, pdev, 0);
                if (!ep->l2t)
                        goto out;
                ep->mtu = dst_mtu(dst);
                ep->tx_chan = cxgb4_port_chan(pdev);
                ep->smac_idx = cxgb4_tp_smt_idx(adapter_type,
                                                cxgb4_port_viid(pdev));
                step = cdev->rdev.lldi.ntxq /
                        cdev->rdev.lldi.nchan;
                ep->txq_idx = cxgb4_port_idx(pdev) * step;
                ep->ctrlq_idx = cxgb4_port_idx(pdev);
                step = cdev->rdev.lldi.nrxq /
                        cdev->rdev.lldi.nchan;
                ep->rss_qid = cdev->rdev.lldi.rxq_ids[
                        cxgb4_port_idx(pdev) * step];
                set_tcp_window(ep, (struct port_info *)netdev_priv(pdev));

                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 c4iw_reconnect(struct c4iw_ep *ep)
{
        int err = 0;
        struct sockaddr_in *laddr = (struct sockaddr_in *)
                                    &ep->com.cm_id->local_addr;
        struct sockaddr_in *raddr = (struct sockaddr_in *)
                                    &ep->com.cm_id->remote_addr;
        struct sockaddr_in6 *laddr6 = (struct sockaddr_in6 *)
                                      &ep->com.cm_id->local_addr;
        struct sockaddr_in6 *raddr6 = (struct sockaddr_in6 *)
                                      &ep->com.cm_id->remote_addr;
        int iptype;
        __u8 *ra;

        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 */
        if (ep->com.cm_id->local_addr.ss_family == AF_INET) {
                ep->dst = find_route(ep->com.dev, laddr->sin_addr.s_addr,
                                     raddr->sin_addr.s_addr, laddr->sin_port,
                                     raddr->sin_port, 0);
                iptype = 4;
                ra = (__u8 *)&raddr->sin_addr;
        } else {
                ep->dst = find_route6(ep->com.dev, laddr6->sin6_addr.s6_addr,
                                      raddr6->sin6_addr.s6_addr,
                                      laddr6->sin6_port, raddr6->sin6_port, 0,
                                      raddr6->sin6_scope_id);
                iptype = 6;
                ra = (__u8 *)&raddr6->sin6_addr;
        }
        if (!ep->dst) {
                pr_err("%s - cannot find route.\n", __func__);
                err = -EHOSTUNREACH;
                goto fail3;
        }
        err = import_ep(ep, iptype, ra, ep->dst, ep->com.dev, false,
                        ep->com.dev->rdev.lldi.adapter_type);
        if (err) {
                pr_err("%s - cannot alloc l2e.\n", __func__);
                goto fail4;
        }

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

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

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

        cxgb4_l2t_release(ep->l2t);
fail4:
        dst_release(ep->dst);
fail3:
        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 = TID_TID_G(AOPEN_ATID_G(
                                      ntohl(rpl->atid_status)));
        struct tid_info *t = dev->rdev.lldi.tids;
        int status = AOPEN_STATUS_G(ntohl(rpl->atid_status));
        struct sockaddr_in *la;
        struct sockaddr_in *ra;
        struct sockaddr_in6 *la6;
        struct sockaddr_in6 *ra6;

        ep = lookup_atid(t, atid);
        la = (struct sockaddr_in *)&ep->com.mapped_local_addr;
        ra = (struct sockaddr_in *)&ep->com.mapped_remote_addr;
        la6 = (struct sockaddr_in6 *)&ep->com.mapped_local_addr;
        ra6 = (struct sockaddr_in6 *)&ep->com.mapped_remote_addr;

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

        if (is_neg_adv(status)) {
                PDBG("%s Connection problems for atid %u status %u (%s)\n",
                     __func__, atid, status, neg_adv_str(status));
                ep->stats.connect_neg_adv++;
                mutex_lock(&dev->rdev.stats.lock);
                dev->rdev.stats.neg_adv++;
                mutex_unlock(&dev->rdev.stats.lock);
                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:
                mutex_lock(&dev->rdev.stats.lock);
                dev->rdev.stats.tcam_full++;
                mutex_unlock(&dev->rdev.stats.lock);
                if (ep->com.local_addr.ss_family == AF_INET &&
                    dev->rdev.lldi.enable_fw_ofld_conn) {
                        send_fw_act_open_req(ep,
                                             TID_TID_G(AOPEN_ATID_G(
                                             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);
                        if (ep->com.remote_addr.ss_family == AF_INET6) {
                                struct sockaddr_in6 *sin6 =
                                                (struct sockaddr_in6 *)
                                                &ep->com.mapped_local_addr;
                                cxgb4_clip_release(
                                                ep->com.dev->rdev.lldi.ports[0],
                                                (const u32 *)
                                                &sin6->sin6_addr.s6_addr, 1);
                        }
                        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:
                if (ep->com.local_addr.ss_family == AF_INET) {
                        pr_info("Active open failure - atid %u status %u errno %d %pI4:%u->%pI4:%u\n",
                                atid, status, status2errno(status),
                                &la->sin_addr.s_addr, ntohs(la->sin_port),
                                &ra->sin_addr.s_addr, ntohs(ra->sin_port));
                } else {
                        pr_info("Active open failure - atid %u status %u errno %d %pI6:%u->%pI6:%u\n",
                                atid, status, status2errno(status),
                                la6->sin6_addr.s6_addr, ntohs(la6->sin6_port),
                                ra6->sin6_addr.s6_addr, ntohs(ra6->sin6_port));
                }
                break;
        }

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

        if (ep->com.remote_addr.ss_family == AF_INET6) {
                struct sockaddr_in6 *sin6 =
                        (struct sockaddr_in6 *)&ep->com.mapped_local_addr;
                cxgb4_clip_release(ep->com.dev->rdev.lldi.ports[0],
                                   (const u32 *)&sin6->sin6_addr.s6_addr, 1);
        }
        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 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, 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;
        struct cpl_t5_pass_accept_rpl *rpl5 = NULL;
        int win;
        enum chip_type adapter_type = ep->com.dev->rdev.lldi.adapter_type;

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

        skb_get(skb);
        rpl = cplhdr(skb);
        if (!is_t4(adapter_type)) {
                skb_trim(skb, roundup(sizeof(*rpl5), 16));
                rpl5 = (void *)rpl;
                INIT_TP_WR(rpl5, ep->hwtid);
        } else {
                skb_trim(skb, sizeof(*rpl));
                INIT_TP_WR(rpl, ep->hwtid);
        }
        OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_PASS_ACCEPT_RPL,
                                                    ep->hwtid));

        best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx,
                 enable_tcp_timestamps && req->tcpopt.tstamp,
                 (AF_INET == ep->com.remote_addr.ss_family) ? 0 : 1);
        wscale = compute_wscale(rcv_win);

        /*
         * Specify the largest window that will fit in opt0. The
         * remainder will be specified in the rx_data_ack.
         */
        win = ep->rcv_win >> 10;
        if (win > RCV_BUFSIZ_M)
                win = RCV_BUFSIZ_M;
        opt0 = (nocong ? NO_CONG_F : 0) |
               KEEP_ALIVE_F |
               DELACK_F |
               WND_SCALE_V(wscale) |
               MSS_IDX_V(mtu_idx) |
               L2T_IDX_V(ep->l2t->idx) |
               TX_CHAN_V(ep->tx_chan) |
               SMAC_SEL_V(ep->smac_idx) |
               DSCP_V(ep->tos >> 2) |
               ULP_MODE_V(ULP_MODE_TCPDDP) |
               RCV_BUFSIZ_V(win);
        opt2 = RX_CHANNEL_V(0) |
               RSS_QUEUE_VALID_F | RSS_QUEUE_V(ep->rss_qid);

        if (enable_tcp_timestamps && req->tcpopt.tstamp)
                opt2 |= TSTAMPS_EN_F;
        if (enable_tcp_sack && req->tcpopt.sack)
                opt2 |= SACK_EN_F;
        if (wscale && enable_tcp_window_scaling)
                opt2 |= WND_SCALE_EN_F;
        if (enable_ecn) {
                const struct tcphdr *tcph;
                u32 hlen = ntohl(req->hdr_len);

                if (CHELSIO_CHIP_VERSION(adapter_type) <= CHELSIO_T5)
                        tcph = (const void *)(req + 1) + ETH_HDR_LEN_G(hlen) +
                                IP_HDR_LEN_G(hlen);
                else
                        tcph = (const void *)(req + 1) +
                                T6_ETH_HDR_LEN_G(hlen) + T6_IP_HDR_LEN_G(hlen);
                if (tcph->ece && tcph->cwr)
                        opt2 |= CCTRL_ECN_V(1);
        }
        if (CHELSIO_CHIP_VERSION(adapter_type) > CHELSIO_T4) {
                u32 isn = (prandom_u32() & ~7UL) - 1;
                opt2 |= T5_OPT_2_VALID_F;
                opt2 |= CONG_CNTRL_V(CONG_ALG_TAHOE);
                opt2 |= T5_ISS_F;
                rpl5 = (void *)rpl;
                memset(&rpl5->iss, 0, roundup(sizeof(*rpl5)-sizeof(*rpl), 16));
                if (peer2peer)
                        isn += 4;
                rpl5->iss = cpu_to_be32(isn);
                PDBG("%s iss %u\n", __func__, be32_to_cpu(rpl5->iss));
        }

        rpl->opt0 = cpu_to_be64(opt0);
        rpl->opt2 = cpu_to_be32(opt2);
        set_wr_txq(skb, CPL_PRIORITY_SETUP, ep->ctrlq_idx);
        t4_set_arp_err_handler(skb, NULL, arp_failure_discard);
        c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);

        return;
}

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

static void get_4tuple(struct cpl_pass_accept_req *req, enum chip_type type,
                       int *iptype, __u8 *local_ip, __u8 *peer_ip,
                       __be16 *local_port, __be16 *peer_port)
{
        int eth_len = (CHELSIO_CHIP_VERSION(type) <= CHELSIO_T5) ?
                      ETH_HDR_LEN_G(be32_to_cpu(req->hdr_len)) :
                      T6_ETH_HDR_LEN_G(be32_to_cpu(req->hdr_len));
        int ip_len = (CHELSIO_CHIP_VERSION(type) <= CHELSIO_T5) ?
                     IP_HDR_LEN_G(be32_to_cpu(req->hdr_len)) :
                     T6_IP_HDR_LEN_G(be32_to_cpu(req->hdr_len));
        struct iphdr *ip = (struct iphdr *)((u8 *)(req + 1) + eth_len);
        struct ipv6hdr *ip6 = (struct ipv6hdr *)((u8 *)(req + 1) + eth_len);
        struct tcphdr *tcp = (struct tcphdr *)
                             ((u8 *)(req + 1) + eth_len + ip_len);

        if (ip->version == 4) {
                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));
                *iptype = 4;
                memcpy(peer_ip, &ip->saddr, 4);
                memcpy(local_ip, &ip->daddr, 4);
        } else {
                PDBG("%s saddr %pI6 daddr %pI6 sport %u dport %u\n", __func__,
                     ip6->saddr.s6_addr, ip6->daddr.s6_addr, ntohs(tcp->source),
                     ntohs(tcp->dest));
                *iptype = 6;
                memcpy(peer_ip, ip6->saddr.s6_addr, 16);
                memcpy(local_ip, ip6->daddr.s6_addr, 16);
        }
        *peer_port = tcp->source;
        *local_port = tcp->dest;

        return;
}

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 = PASS_OPEN_TID_G(ntohl(req->tos_stid));
        struct tid_info *t = dev->rdev.lldi.tids;
        unsigned int hwtid = GET_TID(req);
        struct dst_entry *dst;
        __u8 local_ip[16], peer_ip[16];
        __be16 local_port, peer_port;
        struct sockaddr_in6 *sin6;
        int err;
        u16 peer_mss = ntohs(req->tcpopt.mss);
        int iptype;
        unsigned short hdrs;

        parent_ep = lookup_stid(t, stid);
        if (!parent_ep) {
                PDBG("%s connect request on invalid stid %d\n", __func__, stid);
                goto reject;
        }

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

        get_4tuple(req, parent_ep->com.dev->rdev.lldi.adapter_type, &iptype,
                   local_ip, peer_ip, &local_port, &peer_port);

        /* Find output route */
        if (iptype == 4)  {
                PDBG("%s parent ep %p hwtid %u laddr %pI4 raddr %pI4 lport %d rport %d peer_mss %d\n"
                     , __func__, parent_ep, hwtid,
                     local_ip, peer_ip, ntohs(local_port),
                     ntohs(peer_port), peer_mss);
                dst = find_route(dev, *(__be32 *)local_ip, *(__be32 *)peer_ip,
                                 local_port, peer_port,
                                 PASS_OPEN_TOS_G(ntohl(req->tos_stid)));
        } else {
                PDBG("%s parent ep %p hwtid %u laddr %pI6 raddr %pI6 lport %d rport %d peer_mss %d\n"
                     , __func__, parent_ep, hwtid,
                     local_ip, peer_ip, ntohs(local_port),
                     ntohs(peer_port), peer_mss);
                dst = find_route6(dev, local_ip, peer_ip, local_port, peer_port,
                                  PASS_OPEN_TOS_G(ntohl(req->tos_stid)),
                                  ((struct sockaddr_in6 *)
                                  &parent_ep->com.local_addr)->sin6_scope_id);
        }
        if (!dst) {
                printk(KERN_ERR MOD "%s - failed to find dst entry!\n",
                       __func__);
                goto reject;
        }

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

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

        hdrs = sizeof(struct iphdr) + sizeof(struct tcphdr) +
               ((enable_tcp_timestamps && req->tcpopt.tstamp) ? 12 : 0);
        if (peer_mss && child_ep->mtu > (peer_mss + hdrs))
                child_ep->mtu = peer_mss + hdrs;

        state_set(&child_ep->com, CONNECTING);
        child_ep->com.dev = dev;
        child_ep->com.cm_id = NULL;

        /*
         * The mapped_local and mapped_remote addresses get setup with
         * the actual 4-tuple.  The local address will be based on the
         * actual local address of the connection, but on the port number
         * of the parent listening endpoint.  The remote address is
         * setup based on a query to the IWPM since we don't know what it
         * originally was before mapping.  If no mapping was done, then
         * mapped_remote == remote, and mapped_local == local.
         */
        if (iptype == 4) {
                struct sockaddr_in *sin = (struct sockaddr_in *)
                        &child_ep->com.mapped_local_addr;

                sin->sin_family = PF_INET;
                sin->sin_port = local_port;
                sin->sin_addr.s_addr = *(__be32 *)local_ip;

                sin = (struct sockaddr_in *)&child_ep->com.local_addr;
                sin->sin_family = PF_INET;
                sin->sin_port = ((struct sockaddr_in *)
                                 &parent_ep->com.local_addr)->sin_port;
                sin->sin_addr.s_addr = *(__be32 *)local_ip;

                sin = (struct sockaddr_in *)&child_ep->com.mapped_remote_addr;
                sin->sin_family = PF_INET;
                sin->sin_port = peer_port;
                sin->sin_addr.s_addr = *(__be32 *)peer_ip;
        } else {
                sin6 = (struct sockaddr_in6 *)&child_ep->com.mapped_local_addr;
                sin6->sin6_family = PF_INET6;
                sin6->sin6_port = local_port;
                memcpy(sin6->sin6_addr.s6_addr, local_ip, 16);

                sin6 = (struct sockaddr_in6 *)&child_ep->com.local_addr;
                sin6->sin6_family = PF_INET6;
                sin6->sin6_port = ((struct sockaddr_in6 *)
                                   &parent_ep->com.local_addr)->sin6_port;
                memcpy(sin6->sin6_addr.s6_addr, local_ip, 16);

                sin6 = (struct sockaddr_in6 *)&child_ep->com.mapped_remote_addr;
                sin6->sin6_family = PF_INET6;
                sin6->sin6_port = peer_port;
                memcpy(sin6->sin6_addr.s6_addr, peer_ip, 16);
        }
        memcpy(&child_ep->com.remote_addr, &child_ep->com.mapped_remote_addr,
               sizeof(child_ep->com.remote_addr));
        get_remote_addr(parent_ep, child_ep);

        c4iw_get_ep(&parent_ep->com);
        child_ep->parent_ep = parent_ep;
        child_ep->tos = PASS_OPEN_TOS_G(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, skb, req);
        set_bit(PASS_ACCEPT_REQ, &child_ep->com.history);
        if (iptype == 6) {
                sin6 = (struct sockaddr_in6 *)&child_ep->com.mapped_local_addr;
                cxgb4_clip_get(child_ep->com.dev->rdev.lldi.ports[0],
                               (const u32 *)&sin6->sin6_addr.s6_addr, 1);
        }
        goto out;
reject:
        reject_cr(dev, hwtid, 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:
                (void)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, 0);
                __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;
}

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(req->status)) {
                PDBG("%s Negative advice on abort- tid %u status %d (%s)\n",
                     __func__, ep->hwtid, req->status,
                     neg_adv_str(req->status));
                ep->stats.abort_neg_adv++;
                mutex_lock(&dev->rdev.stats.lock);
                dev->rdev.stats.neg_adv++;
                mutex_unlock(&dev->rdev.stats.lock);
                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:
                (void)stop_ep_timer(ep);
                break;
        case MPA_REQ_SENT:
                (void)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) {
                if (ep->com.remote_addr.ss_family == AF_INET6) {
                        struct sockaddr_in6 *sin6 =
                                        (struct sockaddr_in6 *)
                                        &ep->com.mapped_local_addr;
                        cxgb4_clip_release(
                                        ep->com.dev->rdev.lldi.ports[0],
                                        (const u32 *)&sin6->sin6_addr.s6_addr,
                                        1);
                }
                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:
                (void)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, 0);
                __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 = 0;
        int disconnect = 0;
        struct c4iw_ep *ep = to_ep(cm_id);
        PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid);

        mutex_lock(&ep->com.mutex);
        if (ep->com.state == DEAD) {
                mutex_unlock(&ep->com.mutex);
                c4iw_put_ep(&ep->com);
                return -ECONNRESET;
        }
        set_bit(ULP_REJECT, &ep->com.history);
        BUG_ON(ep->com.state != MPA_REQ_RCVD);
        if (mpa_rev == 0)
                abort_connection(ep, NULL, GFP_KERNEL);
        else {
                err = send_mpa_reject(ep, pdata, pdata_len);
                disconnect = 1;
        }
        mutex_unlock(&ep->com.mutex);
        if (disconnect)
                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);

        mutex_lock(&ep->com.mutex);
        if (ep->com.state == DEAD) {
                err = -ECONNRESET;
                goto err;
        }

        BUG_ON(ep->com.state != MPA_REQ_RCVD);
        BUG_ON(!qp);

        set_bit(ULP_ACCEPT, &ep->com.history);
        if ((conn_param->ord > cur_max_read_depth(ep->com.dev)) ||
            (conn_param->ird > cur_max_read_depth(ep->com.dev))) {
                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) {
                        if (RELAXED_IRD_NEGOTIATION) {
                                ep->ord = ep->ird;
                        } else {
                                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 (RELAXED_IRD_NEGOTIATION &&
                            ep->ord <= h->rdev.lldi.max_ordird_qp) {
                                conn_param->ird = ep->ord;
                        } 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 == 1) {
                if (peer2peer && ep->ird == 0)
                        ep->ird = 1;
        } else {
                if (peer2peer &&
                    (ep->mpa_attr.p2p_type != FW_RI_INIT_P2PTYPE_DISABLED) &&
                    (p2p_type == FW_RI_INIT_P2PTYPE_READ_REQ) && 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;