ClabureDB: Classified Bug-Reports Database

   /*
    * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
    *
    * This software is available to you under a choice of one of two
    * licenses.  You may choose to be licensed under the terms of the GNU
    * General Public License (GPL) Version 2, available from the file
    * COPYING in the main directory of this source tree, or the
    * OpenIB.org BSD license below:
    *
   *     Redistribution and use in source and binary forms, with or
   *     without modification, are permitted provided that the following
   *     conditions are met:
   *
   *      - Redistributions of source code must retain the above
   *        copyright notice, this list of conditions and the following
   *        disclaimer.
   *
   *      - Redistributions in binary form must reproduce the above
   *        copyright notice, this list of conditions and the following
   *        disclaimer in the documentation and/or other materials
   *        provided with the distribution.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  #include <linux/module.h>
  #include <linux/list.h>
  #include <linux/workqueue.h>
  #include <linux/skbuff.h>
  #include <linux/timer.h>
  #include <linux/notifier.h>
  #include <linux/inetdevice.h>
  
  #include <net/neighbour.h>
  #include <net/netevent.h>
  #include <net/route.h>
  
  #include "tcb.h"
  #include "cxgb3_offload.h"
  #include "iwch.h"
  #include "iwch_provider.h"
  #include "iwch_cm.h"
  
  static char *states[] = {
          "idle",
          "listen",
          "connecting",
          "mpa_wait_req",
          "mpa_req_sent",
          "mpa_req_rcvd",
          "mpa_rep_sent",
          "fpdu_mode",
          "aborting",
          "closing",
          "moribund",
          "dead",
          NULL,
  };
  
  int peer2peer = 0;
  module_param(peer2peer, int, 0644);
  MODULE_PARM_DESC(peer2peer, "Support peer2peer ULPs (default=0)");
  
  static int ep_timeout_secs = 60;
  module_param(ep_timeout_secs, int, 0644);
  MODULE_PARM_DESC(ep_timeout_secs, "CM Endpoint operation timeout "
                                     "in seconds (default=60)");
  
  static int mpa_rev = 1;
  module_param(mpa_rev, int, 0644);
  MODULE_PARM_DESC(mpa_rev, "MPA Revision, 0 supports amso1100, "
                   "1 is spec compliant. (default=1)");
  
  static int markers_enabled = 0;
  module_param(markers_enabled, int, 0644);
  MODULE_PARM_DESC(markers_enabled, "Enable MPA MARKERS (default(0)=disabled)");
  
  static int crc_enabled = 1;
  module_param(crc_enabled, int, 0644);
  MODULE_PARM_DESC(crc_enabled, "Enable MPA CRC (default(1)=enabled)");
  
  static int rcv_win = 256 * 1024;
  module_param(rcv_win, int, 0644);
  MODULE_PARM_DESC(rcv_win, "TCP receive window in bytes (default=256)");
  
  static int snd_win = 32 * 1024;
  module_param(snd_win, int, 0644);
  MODULE_PARM_DESC(snd_win, "TCP send window in bytes (default=32KB)");
  
  static unsigned int nocong = 0;
  module_param(nocong, uint, 0644);
  MODULE_PARM_DESC(nocong, "Turn off congestion control (default=0)");
  
 static unsigned int cong_flavor = 1;
 module_param(cong_flavor, uint, 0644);
 MODULE_PARM_DESC(cong_flavor, "TCP Congestion control flavor (default=1)");
 
 static void process_work(struct work_struct *work);
 static struct workqueue_struct *workq;
 static DECLARE_WORK(skb_work, process_work);
 
 static struct sk_buff_head rxq;
 static cxgb3_cpl_handler_func work_handlers[NUM_CPL_CMDS];
 
 static struct sk_buff *get_skb(struct sk_buff *skb, int len, gfp_t gfp);
 static void ep_timeout(unsigned long arg);
 static void connect_reply_upcall(struct iwch_ep *ep, int status);
 
 static void start_ep_timer(struct iwch_ep *ep)
 {
         PDBG("%s ep %p\n", __func__, ep);
         if (timer_pending(&ep->timer)) {
                 PDBG("%s stopped / restarted timer ep %p\n", __func__, ep);
                 del_timer_sync(&ep->timer);
         } else
                 get_ep(&ep->com);
         ep->timer.expires = jiffies + ep_timeout_secs * HZ;
         ep->timer.data = (unsigned long)ep;
         ep->timer.function = ep_timeout;
         add_timer(&ep->timer);
 }
 
 static void stop_ep_timer(struct iwch_ep *ep)
 {
         PDBG("%s ep %p\n", __func__, ep);
         if (!timer_pending(&ep->timer)) {
                 printk(KERN_ERR "%s timer stopped when its not running!  ep %p state %u\n",
                         __func__, ep, ep->com.state);
                 WARN_ON(1);
                 return;
         }
         del_timer_sync(&ep->timer);
         put_ep(&ep->com);
 }
 
 static void release_tid(struct t3cdev *tdev, u32 hwtid, struct sk_buff *skb)
 {
         struct cpl_tid_release *req;
 
         skb = get_skb(skb, sizeof *req, GFP_KERNEL);
         if (!skb)
                 return;
         req = (struct cpl_tid_release *) skb_put(skb, sizeof(*req));
         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_TID_RELEASE, hwtid));
         skb->priority = CPL_PRIORITY_SETUP;
         cxgb3_ofld_send(tdev, skb);
         return;
 }
 
 int iwch_quiesce_tid(struct iwch_ep *ep)
 {
         struct cpl_set_tcb_field *req;
         struct sk_buff *skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
 
         if (!skb)
                 return -ENOMEM;
         req = (struct cpl_set_tcb_field *) skb_put(skb, sizeof(*req));
         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
         req->wr.wr_lo = htonl(V_WR_TID(ep->hwtid));
         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, ep->hwtid));
         req->reply = 0;
         req->cpu_idx = 0;
         req->word = htons(W_TCB_RX_QUIESCE);
         req->mask = cpu_to_be64(1ULL << S_TCB_RX_QUIESCE);
         req->val = cpu_to_be64(1 << S_TCB_RX_QUIESCE);
 
         skb->priority = CPL_PRIORITY_DATA;
         cxgb3_ofld_send(ep->com.tdev, skb);
         return 0;
 }
 
 int iwch_resume_tid(struct iwch_ep *ep)
 {
         struct cpl_set_tcb_field *req;
         struct sk_buff *skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
 
         if (!skb)
                 return -ENOMEM;
         req = (struct cpl_set_tcb_field *) skb_put(skb, sizeof(*req));
         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
         req->wr.wr_lo = htonl(V_WR_TID(ep->hwtid));
         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, ep->hwtid));
         req->reply = 0;
         req->cpu_idx = 0;
         req->word = htons(W_TCB_RX_QUIESCE);
         req->mask = cpu_to_be64(1ULL << S_TCB_RX_QUIESCE);
         req->val = 0;
 
         skb->priority = CPL_PRIORITY_DATA;
         cxgb3_ofld_send(ep->com.tdev, skb);
         return 0;
 }
 
 static void set_emss(struct iwch_ep *ep, u16 opt)
 {
         PDBG("%s ep %p opt %u\n", __func__, ep, opt);
         ep->emss = T3C_DATA(ep->com.tdev)->mtus[G_TCPOPT_MSS(opt)] - 40;
         if (G_TCPOPT_TSTAMP(opt))
                 ep->emss -= 12;
         if (ep->emss < 128)
                 ep->emss = 128;
         PDBG("emss=%d\n", ep->emss);
 }
 
 static enum iwch_ep_state state_read(struct iwch_ep_common *epc)
 {
         unsigned long flags;
         enum iwch_ep_state state;
 
         spin_lock_irqsave(&epc->lock, flags);
         state = epc->state;
         spin_unlock_irqrestore(&epc->lock, flags);
         return state;
 }
 
 static void __state_set(struct iwch_ep_common *epc, enum iwch_ep_state new)
 {
         epc->state = new;
 }
 
 static void state_set(struct iwch_ep_common *epc, enum iwch_ep_state new)
 {
         unsigned long flags;
 
         spin_lock_irqsave(&epc->lock, flags);
         PDBG("%s - %s -> %s\n", __func__, states[epc->state], states[new]);
         __state_set(epc, new);
         spin_unlock_irqrestore(&epc->lock, flags);
         return;
 }
 
 static void *alloc_ep(int size, gfp_t gfp)
 {
         struct iwch_ep_common *epc;
 
         epc = kzalloc(size, gfp);
         if (epc) {
                 kref_init(&epc->kref);
                 spin_lock_init(&epc->lock);
                 init_waitqueue_head(&epc->waitq);
         }
         PDBG("%s alloc ep %p\n", __func__, epc);
         return epc;
 }
 
 void __free_ep(struct kref *kref)
 {
         struct iwch_ep_common *epc;
         epc = container_of(kref, struct iwch_ep_common, kref);
         PDBG("%s ep %p state %s\n", __func__, epc, states[state_read(epc)]);
         kfree(epc);
 }
 
 static void release_ep_resources(struct iwch_ep *ep)
 {
         PDBG("%s ep %p tid %d\n", __func__, ep, ep->hwtid);
         cxgb3_remove_tid(ep->com.tdev, (void *)ep, ep->hwtid);
         dst_release(ep->dst);
         l2t_release(L2DATA(ep->com.tdev), ep->l2t);
         put_ep(&ep->com);
 }
 
 static void process_work(struct work_struct *work)
 {
         struct sk_buff *skb = NULL;
         void *ep;
         struct t3cdev *tdev;
         int ret;
 
         while ((skb = skb_dequeue(&rxq))) {
                 ep = *((void **) (skb->cb));
                 tdev = *((struct t3cdev **) (skb->cb + sizeof(void *)));
                 ret = work_handlers[G_OPCODE(ntohl((__force __be32)skb->csum))](tdev, skb, ep);
                 if (ret & CPL_RET_BUF_DONE)
                         kfree_skb(skb);
 
                 /*
                  * ep was referenced in sched(), and is freed here.
                  */
                 put_ep((struct iwch_ep_common *)ep);
         }
 }
 
 static int status2errno(int status)
 {
         switch (status) {
         case CPL_ERR_NONE:
                 return 0;
         case CPL_ERR_CONN_RESET:
                 return -ECONNRESET;
         case CPL_ERR_ARP_MISS:
                 return -EHOSTUNREACH;
         case CPL_ERR_CONN_TIMEDOUT:
                 return -ETIMEDOUT;
         case CPL_ERR_TCAM_FULL:
                 return -ENOMEM;
         case CPL_ERR_CONN_EXIST:
                 return -EADDRINUSE;
         default:
                 return -EIO;
         }
 }
 
 /*
  * Try and reuse skbs already allocated...
  */
 static struct sk_buff *get_skb(struct sk_buff *skb, int len, gfp_t gfp)
 {
         if (skb && !skb_is_nonlinear(skb) && !skb_cloned(skb)) {
                 skb_trim(skb, 0);
                 skb_get(skb);
         } else {
                 skb = alloc_skb(len, gfp);
         }
         return skb;
 }
 
 static struct rtable *find_route(struct t3cdev *dev, __be32 local_ip,
                                  __be32 peer_ip, __be16 local_port,
                                  __be16 peer_port, u8 tos)
 {
         struct rtable *rt;
         struct flowi fl = {
                 .oif = 0,
                 .nl_u = {
                          .ip4_u = {
                                    .daddr = peer_ip,
                                    .saddr = local_ip,
                                    .tos = tos}
                          },
                 .proto = IPPROTO_TCP,
                 .uli_u = {
                           .ports = {
                                     .sport = local_port,
                                     .dport = peer_port}
                           }
         };
 
         if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0))
                 return NULL;
         return rt;
 }
 
 static unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu)
 {
         int i = 0;
 
         while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu)
                 ++i;
         return i;
 }
 
 static void arp_failure_discard(struct t3cdev *dev, struct sk_buff *skb)
 {
         PDBG("%s t3cdev %p\n", __func__, dev);
         kfree_skb(skb);
 }
 
 /*
  * Handle an ARP failure for an active open.
  */
 static void act_open_req_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
 {
         printk(KERN_ERR MOD "ARP failure duing connect\n");
         kfree_skb(skb);
 }
 
 /*
  * Handle an ARP failure for a CPL_ABORT_REQ.  Change it into a no RST variant
  * and send it along.
  */
 static void abort_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
 {
         struct cpl_abort_req *req = cplhdr(skb);
 
         PDBG("%s t3cdev %p\n", __func__, dev);
         req->cmd = CPL_ABORT_NO_RST;
         cxgb3_ofld_send(dev, skb);
 }
 
 static int send_halfclose(struct iwch_ep *ep, gfp_t gfp)
 {
         struct cpl_close_con_req *req;
         struct sk_buff *skb;
 
         PDBG("%s ep %p\n", __func__, ep);
         skb = get_skb(NULL, sizeof(*req), gfp);
         if (!skb) {
                 printk(KERN_ERR MOD "%s - failed to alloc skb\n", __func__);
                 return -ENOMEM;
         }
         skb->priority = CPL_PRIORITY_DATA;
         set_arp_failure_handler(skb, arp_failure_discard);
         req = (struct cpl_close_con_req *) skb_put(skb, sizeof(*req));
         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
         req->wr.wr_lo = htonl(V_WR_TID(ep->hwtid));
         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, ep->hwtid));
         l2t_send(ep->com.tdev, skb, ep->l2t);
         return 0;
 }
 
 static int send_abort(struct iwch_ep *ep, struct sk_buff *skb, gfp_t gfp)
 {
         struct cpl_abort_req *req;
 
         PDBG("%s ep %p\n", __func__, ep);
         skb = get_skb(skb, sizeof(*req), gfp);
         if (!skb) {
                 printk(KERN_ERR MOD "%s - failed to alloc skb.\n",
                        __func__);
                 return -ENOMEM;
         }
         skb->priority = CPL_PRIORITY_DATA;
         set_arp_failure_handler(skb, abort_arp_failure);
         req = (struct cpl_abort_req *) skb_put(skb, sizeof(*req));
         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
         req->wr.wr_lo = htonl(V_WR_TID(ep->hwtid));
         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, ep->hwtid));
         req->cmd = CPL_ABORT_SEND_RST;
         l2t_send(ep->com.tdev, skb, ep->l2t);
         return 0;
 }
 
 static int send_connect(struct iwch_ep *ep)
 {
         struct cpl_act_open_req *req;
         struct sk_buff *skb;
         u32 opt0h, opt0l, opt2;
         unsigned int mtu_idx;
         int wscale;
 
         PDBG("%s ep %p\n", __func__, ep);
 
         skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
         if (!skb) {
                 printk(KERN_ERR MOD "%s - failed to alloc skb.\n",
                        __func__);
                 return -ENOMEM;
         }
         mtu_idx = find_best_mtu(T3C_DATA(ep->com.tdev), dst_mtu(ep->dst));
         wscale = compute_wscale(rcv_win);
         opt0h = V_NAGLE(0) |
             V_NO_CONG(nocong) |
             V_KEEP_ALIVE(1) |
             F_TCAM_BYPASS |
             V_WND_SCALE(wscale) |
             V_MSS_IDX(mtu_idx) |
             V_L2T_IDX(ep->l2t->idx) | V_TX_CHANNEL(ep->l2t->smt_idx);
         opt0l = V_TOS((ep->tos >> 2) & M_TOS) | V_RCV_BUFSIZ(rcv_win>>10);
         opt2 = V_FLAVORS_VALID(1) | V_CONG_CONTROL_FLAVOR(cong_flavor);
         skb->priority = CPL_PRIORITY_SETUP;
         set_arp_failure_handler(skb, act_open_req_arp_failure);
 
         req = (struct cpl_act_open_req *) skb_put(skb, sizeof(*req));
         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, ep->atid));
         req->local_port = ep->com.local_addr.sin_port;
         req->peer_port = ep->com.remote_addr.sin_port;
         req->local_ip = ep->com.local_addr.sin_addr.s_addr;
         req->peer_ip = ep->com.remote_addr.sin_addr.s_addr;
         req->opt0h = htonl(opt0h);
         req->opt0l = htonl(opt0l);
         req->params = 0;
         req->opt2 = htonl(opt2);
         l2t_send(ep->com.tdev, skb, ep->l2t);
         return 0;
 }
 
 static void send_mpa_req(struct iwch_ep *ep, struct sk_buff *skb)
 {
         int mpalen;
         struct tx_data_wr *req;
         struct mpa_message *mpa;
         int len;
 
         PDBG("%s ep %p pd_len %d\n", __func__, ep, ep->plen);
 
         BUG_ON(skb_cloned(skb));
 
         mpalen = sizeof(*mpa) + ep->plen;
         if (skb->data + mpalen + sizeof(*req) > skb_end_pointer(skb)) {
                 kfree_skb(skb);
                 skb=alloc_skb(mpalen + sizeof(*req), GFP_KERNEL);
                 if (!skb) {
                         connect_reply_upcall(ep, -ENOMEM);
                         return;
                 }
         }
         skb_trim(skb, 0);
         skb_reserve(skb, sizeof(*req));
         skb_put(skb, mpalen);
         skb->priority = CPL_PRIORITY_DATA;
         mpa = (struct mpa_message *) skb->data;
         memset(mpa, 0, sizeof(*mpa));
         memcpy(mpa->key, MPA_KEY_REQ, sizeof(mpa->key));
         mpa->flags = (crc_enabled ? MPA_CRC : 0) |
                      (markers_enabled ? MPA_MARKERS : 0);
         mpa->private_data_size = htons(ep->plen);
         mpa->revision = mpa_rev;
 
         if (ep->plen)
                 memcpy(mpa->private_data, ep->mpa_pkt + sizeof(*mpa), ep->plen);
 
         /*
          * Reference the mpa skb.  This ensures the data area
          * will remain in memory until the hw acks the tx.
          * Function tx_ack() will deref it.
          */
         skb_get(skb);
         set_arp_failure_handler(skb, arp_failure_discard);
         skb_reset_transport_header(skb);
         len = skb->len;
         req = (struct tx_data_wr *) skb_push(skb, sizeof(*req));
         req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA)|F_WR_COMPL);
         req->wr_lo = htonl(V_WR_TID(ep->hwtid));
         req->len = htonl(len);
         req->param = htonl(V_TX_PORT(ep->l2t->smt_idx) |
                            V_TX_SNDBUF(snd_win>>15));
         req->flags = htonl(F_TX_INIT);
         req->sndseq = htonl(ep->snd_seq);
         BUG_ON(ep->mpa_skb);
         ep->mpa_skb = skb;
         l2t_send(ep->com.tdev, skb, ep->l2t);
         start_ep_timer(ep);
         state_set(&ep->com, MPA_REQ_SENT);
         return;
 }
 
 static int send_mpa_reject(struct iwch_ep *ep, const void *pdata, u8 plen)
 {
         int mpalen;
         struct tx_data_wr *req;
         struct mpa_message *mpa;
         struct sk_buff *skb;
 
         PDBG("%s ep %p plen %d\n", __func__, ep, plen);
 
         mpalen = sizeof(*mpa) + plen;
 
         skb = get_skb(NULL, mpalen + sizeof(*req), GFP_KERNEL);
         if (!skb) {
                 printk(KERN_ERR MOD "%s - cannot alloc skb!\n", __func__);
                 return -ENOMEM;
         }
         skb_reserve(skb, sizeof(*req));
         mpa = (struct mpa_message *) skb_put(skb, mpalen);
         memset(mpa, 0, sizeof(*mpa));
         memcpy(mpa->key, MPA_KEY_REP, sizeof(mpa->key));
         mpa->flags = MPA_REJECT;
         mpa->revision = mpa_rev;
         mpa->private_data_size = htons(plen);
         if (plen)
                 memcpy(mpa->private_data, pdata, plen);
 
         /*
          * Reference the mpa skb again.  This ensures the data area
          * will remain in memory until the hw acks the tx.
          * Function tx_ack() will deref it.
          */
         skb_get(skb);
         skb->priority = CPL_PRIORITY_DATA;
         set_arp_failure_handler(skb, arp_failure_discard);
         skb_reset_transport_header(skb);
         req = (struct tx_data_wr *) skb_push(skb, sizeof(*req));
         req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA)|F_WR_COMPL);
         req->wr_lo = htonl(V_WR_TID(ep->hwtid));
         req->len = htonl(mpalen);
         req->param = htonl(V_TX_PORT(ep->l2t->smt_idx) |
                            V_TX_SNDBUF(snd_win>>15));
         req->flags = htonl(F_TX_INIT);
         req->sndseq = htonl(ep->snd_seq);
         BUG_ON(ep->mpa_skb);
         ep->mpa_skb = skb;
         l2t_send(ep->com.tdev, skb, ep->l2t);
         return 0;
 }
 
 static int send_mpa_reply(struct iwch_ep *ep, const void *pdata, u8 plen)
 {
         int mpalen;
         struct tx_data_wr *req;
         struct mpa_message *mpa;
         int len;
         struct sk_buff *skb;
 
         PDBG("%s ep %p plen %d\n", __func__, ep, plen);
 
         mpalen = sizeof(*mpa) + plen;
 
         skb = get_skb(NULL, mpalen + sizeof(*req), GFP_KERNEL);
         if (!skb) {
                 printk(KERN_ERR MOD "%s - cannot alloc skb!\n", __func__);
                 return -ENOMEM;
         }
         skb->priority = CPL_PRIORITY_DATA;
         skb_reserve(skb, sizeof(*req));
         mpa = (struct mpa_message *) skb_put(skb, mpalen);
         memset(mpa, 0, sizeof(*mpa));
         memcpy(mpa->key, MPA_KEY_REP, sizeof(mpa->key));
         mpa->flags = (ep->mpa_attr.crc_enabled ? MPA_CRC : 0) |
                      (markers_enabled ? MPA_MARKERS : 0);
         mpa->revision = mpa_rev;
         mpa->private_data_size = htons(plen);
         if (plen)
                 memcpy(mpa->private_data, pdata, plen);
 
         /*
          * Reference the mpa skb.  This ensures the data area
          * will remain in memory until the hw acks the tx.
          * Function tx_ack() will deref it.
          */
         skb_get(skb);
         set_arp_failure_handler(skb, arp_failure_discard);
         skb_reset_transport_header(skb);
         len = skb->len;
         req = (struct tx_data_wr *) skb_push(skb, sizeof(*req));
         req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA)|F_WR_COMPL);
         req->wr_lo = htonl(V_WR_TID(ep->hwtid));
         req->len = htonl(len);
         req->param = htonl(V_TX_PORT(ep->l2t->smt_idx) |
                            V_TX_SNDBUF(snd_win>>15));
         req->flags = htonl(F_TX_INIT);
         req->sndseq = htonl(ep->snd_seq);
         ep->mpa_skb = skb;
         state_set(&ep->com, MPA_REP_SENT);
         l2t_send(ep->com.tdev, skb, ep->l2t);
         return 0;
 }
 
 static int act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 {
         struct iwch_ep *ep = ctx;
         struct cpl_act_establish *req = cplhdr(skb);
         unsigned int tid = GET_TID(req);
 
         PDBG("%s ep %p tid %d\n", __func__, ep, tid);
 
         dst_confirm(ep->dst);
 
         /* setup the hwtid for this connection */
         ep->hwtid = tid;
         cxgb3_insert_tid(ep->com.tdev, &t3c_client, ep, tid);
 
         ep->snd_seq = ntohl(req->snd_isn);
         ep->rcv_seq = ntohl(req->rcv_isn);
 
         set_emss(ep, ntohs(req->tcp_opt));
 
         /* dealloc the atid */
         cxgb3_free_atid(ep->com.tdev, ep->atid);
 
         /* start MPA negotiation */
         send_mpa_req(ep, skb);
 
         return 0;
 }
 
 static void abort_connection(struct iwch_ep *ep, struct sk_buff *skb, gfp_t gfp)
 {
         PDBG("%s ep %p\n", __FILE__, ep);
         state_set(&ep->com, ABORTING);
         send_abort(ep, skb, gfp);
 }
 
 static void close_complete_upcall(struct iwch_ep *ep)
 {
         struct iw_cm_event event;
 
         PDBG("%s ep %p\n", __func__, ep);
         memset(&event, 0, sizeof(event));
         event.event = IW_CM_EVENT_CLOSE;
         if (ep->com.cm_id) {
                 PDBG("close complete delivered ep %p cm_id %p tid %d\n",
                      ep, ep->com.cm_id, ep->hwtid);
                 ep->com.cm_id->event_handler(ep->com.cm_id, &event);
                 ep->com.cm_id->rem_ref(ep->com.cm_id);
                 ep->com.cm_id = NULL;
                 ep->com.qp = NULL;
         }
 }
 
 static void peer_close_upcall(struct iwch_ep *ep)
 {
         struct iw_cm_event event;
 
         PDBG("%s ep %p\n", __func__, ep);
         memset(&event, 0, sizeof(event));
         event.event = IW_CM_EVENT_DISCONNECT;
         if (ep->com.cm_id) {
                 PDBG("peer close delivered ep %p cm_id %p tid %d\n",
                      ep, ep->com.cm_id, ep->hwtid);
                 ep->com.cm_id->event_handler(ep->com.cm_id, &event);
         }
 }
 
 static void peer_abort_upcall(struct iwch_ep *ep)
 {
         struct iw_cm_event event;
 
         PDBG("%s ep %p\n", __func__, ep);
         memset(&event, 0, sizeof(event));
         event.event = IW_CM_EVENT_CLOSE;
         event.status = -ECONNRESET;
         if (ep->com.cm_id) {
                 PDBG("abort delivered ep %p cm_id %p tid %d\n", ep,
                      ep->com.cm_id, ep->hwtid);
                 ep->com.cm_id->event_handler(ep->com.cm_id, &event);
                 ep->com.cm_id->rem_ref(ep->com.cm_id);
                 ep->com.cm_id = NULL;
                 ep->com.qp = NULL;
         }
 }
 
 static void connect_reply_upcall(struct iwch_ep *ep, int status)
 {
         struct iw_cm_event event;
 
         PDBG("%s ep %p status %d\n", __func__, ep, status);
         memset(&event, 0, sizeof(event));
         event.event = IW_CM_EVENT_CONNECT_REPLY;
         event.status = status;
         event.local_addr = ep->com.local_addr;
         event.remote_addr = ep->com.remote_addr;
 
         if ((status == 0) || (status == -ECONNREFUSED)) {
                 event.private_data_len = ep->plen;
                 event.private_data = ep->mpa_pkt + sizeof(struct mpa_message);
         }
         if (ep->com.cm_id) {
                 PDBG("%s ep %p tid %d status %d\n", __func__, ep,
                      ep->hwtid, status);
                 ep->com.cm_id->event_handler(ep->com.cm_id, &event);
         }
         if (status < 0) {
                 ep->com.cm_id->rem_ref(ep->com.cm_id);
                 ep->com.cm_id = NULL;
                 ep->com.qp = NULL;
         }
 }
 
 static void connect_request_upcall(struct iwch_ep *ep)
 {
         struct iw_cm_event event;
 
         PDBG("%s ep %p tid %d\n", __func__, ep, ep->hwtid);
         memset(&event, 0, sizeof(event));
         event.event = IW_CM_EVENT_CONNECT_REQUEST;
         event.local_addr = ep->com.local_addr;
         event.remote_addr = ep->com.remote_addr;
         event.private_data_len = ep->plen;
         event.private_data = ep->mpa_pkt + sizeof(struct mpa_message);
         event.provider_data = ep;
         if (state_read(&ep->parent_ep->com) != DEAD)
                 ep->parent_ep->com.cm_id->event_handler(
                                                 ep->parent_ep->com.cm_id,
                                                 &event);
         put_ep(&ep->parent_ep->com);
         ep->parent_ep = NULL;
 }
 
 static void established_upcall(struct iwch_ep *ep)
 {
         struct iw_cm_event event;
 
         PDBG("%s ep %p\n", __func__, ep);
         memset(&event, 0, sizeof(event));
         event.event = IW_CM_EVENT_ESTABLISHED;
         if (ep->com.cm_id) {
                 PDBG("%s ep %p tid %d\n", __func__, ep, ep->hwtid);
                 ep->com.cm_id->event_handler(ep->com.cm_id, &event);
         }
 }
 
 static int update_rx_credits(struct iwch_ep *ep, u32 credits)
 {
         struct cpl_rx_data_ack *req;
         struct sk_buff *skb;
 
         PDBG("%s ep %p credits %u\n", __func__, ep, credits);
         skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
         if (!skb) {
                 printk(KERN_ERR MOD "update_rx_credits - cannot alloc skb!\n");
                 return 0;
         }
 
         req = (struct cpl_rx_data_ack *) skb_put(skb, sizeof(*req));
         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, ep->hwtid));
         req->credit_dack = htonl(V_RX_CREDITS(credits) | V_RX_FORCE_ACK(1));
         skb->priority = CPL_PRIORITY_ACK;
         cxgb3_ofld_send(ep->com.tdev, skb);
         return credits;
 }
 
 static void process_mpa_reply(struct iwch_ep *ep, struct sk_buff *skb)
 {
         struct mpa_message *mpa;
         u16 plen;
         struct iwch_qp_attributes attrs;
         enum iwch_qp_attr_mask mask;
         int err;
 
         PDBG("%s ep %p\n", __func__, ep);
 
         /*
          * Stop mpa timer.  If it expired, then the state has
          * changed and we bail since ep_timeout already aborted
          * the connection.
          */
         stop_ep_timer(ep);
         if (state_read(&ep->com) != MPA_REQ_SENT)
                 return;
 
         /*
          * If we get more than the supported amount of private data
          * then we must fail this connection.
          */
         if (ep->mpa_pkt_len + skb->len > sizeof(ep->mpa_pkt)) {
                 err = -EINVAL;
                 goto err;
         }
 
         /*
          * copy the new data into our accumulation buffer.
          */
         skb_copy_from_linear_data(skb, &(ep->mpa_pkt[ep->mpa_pkt_len]),
                                   skb->len);
         ep->mpa_pkt_len += skb->len;
 
         /*
          * if we don't even have the mpa message, then bail.
          */
         if (ep->mpa_pkt_len < sizeof(*mpa))
                 return;
         mpa = (struct mpa_message *) ep->mpa_pkt;
 
         /* Validate MPA header. */
         if (mpa->revision != mpa_rev) {
                 err = -EPROTO;
                 goto err;
         }
         if (memcmp(mpa->key, MPA_KEY_REP, sizeof(mpa->key))) {
                 err = -EPROTO;
                 goto err;
         }
 
         plen = ntohs(mpa->private_data_size);
 
         /*
          * Fail if there's too much private data.
          */
         if (plen > MPA_MAX_PRIVATE_DATA) {
                 err = -EPROTO;
                 goto err;
         }
 
         /*
          * If plen does not account for pkt size
          */
         if (ep->mpa_pkt_len > (sizeof(*mpa) + plen)) {
                 err = -EPROTO;
                 goto err;
         }
 
         ep->plen = (u8) plen;
 
         /*
          * If we don't have all the pdata yet, then bail.
          * We'll continue process when more data arrives.
          */
         if (ep->mpa_pkt_len < (sizeof(*mpa) + plen))
                 return;
 
         if (mpa->flags & MPA_REJECT) {
                 err = -ECONNREFUSED;
                 goto err;
         }
 
         /*
          * If we get here we have accumulated the entire mpa
          * start reply message including private data. And
          * the MPA header is valid.
          */
         state_set(&ep->com, FPDU_MODE);
         ep->mpa_attr.initiator = 1;
         ep->mpa_attr.crc_enabled = (mpa->flags & MPA_CRC) | crc_enabled ? 1 : 0;
         ep->mpa_attr.recv_marker_enabled = markers_enabled;
         ep->mpa_attr.xmit_marker_enabled = mpa->flags & MPA_MARKERS ? 1 : 0;
         ep->mpa_attr.version = mpa_rev;
         PDBG("%s - crc_enabled=%d, recv_marker_enabled=%d, "
              "xmit_marker_enabled=%d, version=%d\n", __func__,
              ep->mpa_attr.crc_enabled, ep->mpa_attr.recv_marker_enabled,
              ep->mpa_attr.xmit_marker_enabled, ep->mpa_attr.version);
 
         attrs.mpa_attr = ep->mpa_attr;
         attrs.max_ird = ep->ird;
         attrs.max_ord = ep->ord;
         attrs.llp_stream_handle = ep;
         attrs.next_state = IWCH_QP_STATE_RTS;
 
         mask = IWCH_QP_ATTR_NEXT_STATE |
             IWCH_QP_ATTR_LLP_STREAM_HANDLE | IWCH_QP_ATTR_MPA_ATTR |
             IWCH_QP_ATTR_MAX_IRD | IWCH_QP_ATTR_MAX_ORD;
 
         /* bind QP and TID with INIT_WR */
         err = iwch_modify_qp(ep->com.qp->rhp,
                              ep->com.qp, mask, &attrs, 1);
         if (err)
                 goto err;
 
         if (peer2peer && iwch_rqes_posted(ep->com.qp) == 0) {
                 iwch_post_zb_read(ep->com.qp);
         }
 
         goto out;
 err:
         abort_connection(ep, skb, GFP_KERNEL);
 out:
         connect_reply_upcall(ep, err);
         return;
 }
 
 static void process_mpa_request(struct iwch_ep *ep, struct sk_buff *skb)
 {
         struct mpa_message *mpa;
         u16 plen;
 
         PDBG("%s ep %p\n", __func__, ep);
 
         /*
          * Stop mpa timer.  If it expired, then the state has
          * changed and we bail since ep_timeout already aborted
          * the connection.
          */
         stop_ep_timer(ep);
         if (state_read(&ep->com) != MPA_REQ_WAIT)
                 return;
 
         /*
          * If we get more than the supported amount of private data
          * then we must fail this connection.
          */
         if (ep->mpa_pkt_len + skb->len > sizeof(ep->mpa_pkt)) {
                 abort_connection(ep, skb, GFP_KERNEL);
                 return;
         }
 
         PDBG("%s enter (%s line %u)\n", __func__, __FILE__, __LINE__);
 
         /*
          * Copy the new data into our accumulation buffer.
          */
         skb_copy_from_linear_data(skb, &(ep->mpa_pkt[ep->mpa_pkt_len]),
                                   skb->len);
         ep->mpa_pkt_len += skb->len;
 
         /*
          * If we don't even have the mpa message, then bail.
          * We'll continue process when more data arrives.
          */
         if (ep->mpa_pkt_len < sizeof(*mpa))
                 return;
         PDBG("%s enter (%s line %u)\n", __func__, __FILE__, __LINE__);
         mpa = (struct mpa_message *) ep->mpa_pkt;
 
         /*
          * Validate MPA Header.
          */
         if (mpa->revision != mpa_rev) {
                 abort_connection(ep, skb, GFP_KERNEL);
                 return;
         }
 
         if (memcmp(mpa->key, MPA_KEY_REQ, sizeof(mpa->key))) {
                 abort_connection(ep, skb, GFP_KERNEL);
                 return;
         }
 
         plen = ntohs(mpa->private_data_size);
 
         /*
          * Fail if there's too much private data.
          */
         if (plen > MPA_MAX_PRIVATE_DATA) {
                 abort_connection(ep, skb, GFP_KERNEL);
                 return;
         }
 
         /*
          * If plen does not account for pkt size
          */
         if (ep->mpa_pkt_len > (sizeof(*mpa) + plen)) {
                abort_connection(ep, skb, GFP_KERNEL);
                return;
        }
        ep->plen = (u8) plen;

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

        /*
         * If we get here we have accumulated the entire mpa
         * start reply message including private data.
         */
        ep->mpa_attr.initiator = 0;
        ep->mpa_attr.crc_enabled = (mpa->flags & MPA_CRC) | crc_enabled ? 1 : 0;
        ep->mpa_attr.recv_marker_enabled = markers_enabled;
        ep->mpa_attr.xmit_marker_enabled = mpa->flags & MPA_MARKERS ? 1 : 0;
        ep->mpa_attr.version = mpa_rev;
        PDBG("%s - crc_enabled=%d, recv_marker_enabled=%d, "
             "xmit_marker_enabled=%d, version=%d\n", __func__,
             ep->mpa_attr.crc_enabled, ep->mpa_attr.recv_marker_enabled,
             ep->mpa_attr.xmit_marker_enabled, ep->mpa_attr.version);

        state_set(&ep->com, MPA_REQ_RCVD);

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

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

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

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

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

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

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

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

        return CPL_RET_BUF_DONE;
}

/*
 * Upcall from the adapter indicating data has been transmitted.
 * For us its just the single MPA request or reply.  We can now free
 * the skb holding the mpa message.
 */
static int tx_ack(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
        struct iwch_ep *ep = ctx;
        struct cpl_wr_ack *hdr = cplhdr(skb);
        unsigned int credits = ntohs(hdr->credits);

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

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

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

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

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

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

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

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

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

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

        PDBG("%s ep %p status %u errno %d\n", __func__, ep, rpl->status,
             status2errno(rpl->status));
        connect_reply_upcall(ep, status2errno(rpl->status));
        state_set(&ep->com, DEAD);
        if (ep->com.tdev->type != T3A && act_open_has_tid(rpl->status))
                release_tid(ep->com.tdev, GET_TID(rpl), NULL);
        cxgb3_free_atid(ep->com.tdev, ep->atid);
        dst_release(ep->dst);
        l2t_release(L2DATA(ep->com.tdev), ep->l2t);
        put_ep(&ep->com);
        return CPL_RET_BUF_DONE;
}

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

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

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

        skb->priority = 1;
        cxgb3_ofld_send(ep->com.tdev, skb);
        return 0;
}

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

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

        return CPL_RET_BUF_DONE;
}

static int listen_stop(struct iwch_listen_ep *ep)
{
        struct sk_buff *skb;
        struct cpl_close_listserv_req *req;

        PDBG("%s ep %p\n", __func__, ep);
        skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
        if (!skb) {
                printk(KERN_ERR MOD "%s - failed to alloc skb\n", __func__);
                return -ENOMEM;
        }
        req = (struct cpl_close_listserv_req *) skb_put(skb, sizeof(*req));
        req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
        req->cpu_idx = 0;
        OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_LISTSRV_REQ, ep->stid));
        skb->priority = 1;
        cxgb3_ofld_send(ep->com.tdev, skb);
        return 0;
}

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

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

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

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

        rpl = cplhdr(skb);
        rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
        OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_PASS_ACCEPT_RPL, ep->hwtid));
        rpl->peer_ip = peer_ip;
        rpl->opt0h = htonl(opt0h);
        rpl->opt0l_status = htonl(opt0l | CPL_PASS_OPEN_ACCEPT);
        rpl->opt2 = htonl(opt2);
        rpl->rsvd = rpl->opt2;        /* workaround for HW bug */
        skb->priority = CPL_PRIORITY_SETUP;
        l2t_send(ep->com.tdev, skb, ep->l2t);

        return;
}

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

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

                rpl = cplhdr(skb);
                skb->priority = CPL_PRIORITY_SETUP;
                rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
                OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_PASS_ACCEPT_RPL,
                                                      hwtid));
                rpl->peer_ip = peer_ip;
                rpl->opt0h = htonl(F_TCAM_BYPASS);
                rpl->opt0l_status = htonl(CPL_PASS_OPEN_REJECT);
                rpl->opt2 = 0;
                rpl->rsvd = rpl->opt2;
                cxgb3_ofld_send(tdev, skb);
        }
}

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

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

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

        /*
         * Find the netdev for this connection request.
         */
        tim.mac_addr = req->dst_mac;
        tim.vlan_tag = ntohs(req->vlan_tag);
        if (tdev->ctl(tdev, GET_IFF_FROM_MAC, &tim) < 0 || !tim.dev) {
                printk(KERN_ERR
                        "%s bad dst mac %02x %02x %02x %02x %02x %02x\n",
                        __func__,
                        req->dst_mac[0],
                        req->dst_mac[1],
                        req->dst_mac[2],
                        req->dst_mac[3],
                        req->dst_mac[4],
                        req->dst_mac[5]);
                goto reject;
        }

        /* Find output route */
        rt = find_route(tdev,
                        req->local_ip,
                        req->peer_ip,
                        req->local_port,
                        req->peer_port, G_PASS_OPEN_TOS(ntohl(req->tos_tid)));
        if (!rt) {
                printk(KERN_ERR MOD "%s - failed to find dst entry!\n",
                       __func__);
                goto reject;
        }
        dst = &rt->u.dst;
        l2t = t3_l2t_get(tdev, dst->neighbour, dst->neighbour->dev);
        if (!l2t) {
                printk(KERN_ERR MOD "%s - failed to allocate l2t entry!\n",
                       __func__);
                dst_release(dst);
                goto reject;
        }
        child_ep = alloc_ep(sizeof(*child_ep), GFP_KERNEL);
        if (!child_ep) {
                printk(KERN_ERR MOD "%s - failed to allocate ep entry!\n",
                       __func__);
                l2t_release(L2DATA(tdev), l2t);
                dst_release(dst);
                goto reject;
        }
        state_set(&child_ep->com, CONNECTING);
        child_ep->com.tdev = tdev;
        child_ep->com.cm_id = NULL;
        child_ep->com.local_addr.sin_family = PF_INET;
        child_ep->com.local_addr.sin_port = req->local_port;
        child_ep->com.local_addr.sin_addr.s_addr = req->local_ip;
        child_ep->com.remote_addr.sin_family = PF_INET;
        child_ep->com.remote_addr.sin_port = req->peer_port;
        child_ep->com.remote_addr.sin_addr.s_addr = req->peer_ip;
        get_ep(&parent_ep->com);
        child_ep->parent_ep = parent_ep;
        child_ep->tos = G_PASS_OPEN_TOS(ntohl(req->tos_tid));
        child_ep->l2t = l2t;
        child_ep->dst = dst;
        child_ep->hwtid = hwtid;
        init_timer(&child_ep->timer);
        cxgb3_insert_tid(tdev, &t3c_client, child_ep, hwtid);
        accept_cr(child_ep, req->peer_ip, skb);
        goto out;
reject:
        reject_cr(tdev, hwtid, req->peer_ip, skb);
out:
        return CPL_RET_BUF_DONE;
}

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

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

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

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

        return CPL_RET_BUF_DONE;
}

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

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

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

                /*
                 * We're gonna mark this puppy DEAD, but keep
                 * the reference on it until the ULP accepts or
                 * rejects the CR.
                 */
                __state_set(&ep->com, CLOSING);
                get_ep(&ep->com);
                break;
        case MPA_REP_SENT:
                __state_set(&ep->com, CLOSING);
                ep->com.rpl_done = 1;
                ep->com.rpl_err = -ECONNRESET;
                PDBG("waking up ep %p\n", ep);
                wake_up(&ep->com.waitq);
                break;
        case FPDU_MODE:
                start_ep_timer(ep);
                __state_set(&ep->com, CLOSING);
                attrs.next_state = IWCH_QP_STATE_CLOSING;
                iwch_modify_qp(ep->com.qp->rhp, ep->com.qp,
                               IWCH_QP_ATTR_NEXT_STATE, &attrs, 1);
                peer_close_upcall(ep);
                break;
        case ABORTING:
                disconnect = 0;
                break;
        case CLOSING:
                __state_set(&ep->com, MORIBUND);
                disconnect = 0;
                break;
        case MORIBUND:
                stop_ep_timer(ep);
                if (ep->com.cm_id && ep->com.qp) {
                        attrs.next_state = IWCH_QP_STATE_IDLE;
                        iwch_modify_qp(ep->com.qp->rhp, ep->com.qp,
                                       IWCH_QP_ATTR_NEXT_STATE, &attrs, 1);
                }
                close_complete_upcall(ep);
                __state_set(&ep->com, DEAD);
                release = 1;
                disconnect = 0;
                break;
        case DEAD:
                disconnect = 0;
                break;
        default:
                BUG_ON(1);
        }
        spin_unlock_irqrestore(&ep->com.lock, flags);
        if (disconnect)
                iwch_ep_disconnect(ep, 0, GFP_KERNEL);
        if (release)
                release_ep_resources(ep);
        return CPL_RET_BUF_DONE;
}

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

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

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

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

        spin_lock_irqsave(&ep->com.lock, flags);
        PDBG("%s ep %p state %u\n", __func__, ep, ep->com.state);
        switch (ep->com.state) {
        case CONNECTING:
                break;
        case MPA_REQ_WAIT:
                stop_ep_timer(ep);
                break;
        case MPA_REQ_SENT:
                stop_ep_timer(ep);
                connect_reply_upcall(ep, -ECONNRESET);
                break;
        case MPA_REP_SENT:
                ep->com.rpl_done = 1;
                ep->com.rpl_err = -ECONNRESET;
                PDBG("waking up ep %p\n", ep);
                wake_up(&ep->com.waitq);
                break;
        case MPA_REQ_RCVD:

                /*
                 * We're gonna mark this puppy DEAD, but keep
                 * the reference on it until the ULP accepts or
                 * rejects the CR.
                 */
                get_ep(&ep->com);
                break;
        case MORIBUND:
        case CLOSING:
                stop_ep_timer(ep);
                /*FALLTHROUGH*/
        case FPDU_MODE:
                if (ep->com.cm_id && ep->com.qp) {
                        attrs.next_state = IWCH_QP_STATE_ERROR;
                        ret = iwch_modify_qp(ep->com.qp->rhp,
                                     ep->com.qp, IWCH_QP_ATTR_NEXT_STATE,
                                     &attrs, 1);
                        if (ret)
                                printk(KERN_ERR MOD
                                       "%s - qp <- error failed!\n",
                                       __func__);
                }
                peer_abort_upcall(ep);
                break;
        case ABORTING:
                break;
        case DEAD:
                PDBG("%s PEER_ABORT IN DEAD STATE!!!!\n", __func__);
                spin_unlock_irqrestore(&ep->com.lock, flags);
                return CPL_RET_BUF_DONE;
        default:
                BUG_ON(1);
                break;
        }
        dst_confirm(ep->dst);
        if (ep->com.state != ABORTING) {
                __state_set(&ep->com, DEAD);
                release = 1;
        }
        spin_unlock_irqrestore(&ep->com.lock, flags);

        rpl_skb = get_skb(skb, sizeof(*rpl), GFP_KERNEL);
        if (!rpl_skb) {
                printk(KERN_ERR MOD "%s - cannot allocate skb!\n",
                       __func__);
                release = 1;
                goto out;
        }
        rpl_skb->priority = CPL_PRIORITY_DATA;
        rpl = (struct cpl_abort_rpl *) skb_put(rpl_skb, sizeof(*rpl));
        rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
        rpl->wr.wr_lo = htonl(V_WR_TID(ep->hwtid));
        OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, ep->hwtid));
        rpl->cmd = CPL_ABORT_NO_RST;
        cxgb3_ofld_send(ep->com.tdev, rpl_skb);
out:
        if (release)
                release_ep_resources(ep);
        return CPL_RET_BUF_DONE;
}

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

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

        /* The cm_id may be null if we failed to connect */
        spin_lock_irqsave(&ep->com.lock, flags);
        switch (ep->com.state) {
        case CLOSING:
                __state_set(&ep->com, MORIBUND);
                break;
        case MORIBUND:
                stop_ep_timer(ep);
                if ((ep->com.cm_id) && (ep->com.qp)) {
                        attrs.next_state = IWCH_QP_STATE_IDLE;
                        iwch_modify_qp(ep->com.qp->rhp,
                                             ep->com.qp,
                                             IWCH_QP_ATTR_NEXT_STATE,
                                             &attrs, 1);
                }
                close_complete_upcall(ep);
                __state_set(&ep->com, DEAD);
                release = 1;
                break;
        case ABORTING:
        case DEAD:
                break;
        default:
                BUG_ON(1);
                break;
        }
        spin_unlock_irqrestore(&ep->com.lock, flags);
        if (release)
                release_ep_resources(ep);
        return CPL_RET_BUF_DONE;
}

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

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

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

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

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

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

        spin_lock_irqsave(&ep->com.lock, flags);
        PDBG("%s ep %p tid %u state %d\n", __func__, ep, ep->hwtid,
             ep->com.state);
        switch (ep->com.state) {
        case MPA_REQ_SENT:
                __state_set(&ep->com, ABORTING);
                connect_reply_upcall(ep, -ETIMEDOUT);
                break;
        case MPA_REQ_WAIT:
                __state_set(&ep->com, ABORTING);
                break;
        case CLOSING:
        case MORIBUND:
                if (ep->com.cm_id && ep->com.qp) {
                        attrs.next_state = IWCH_QP_STATE_ERROR;
                        iwch_modify_qp(ep->com.qp->rhp,
                                     ep->com.qp, IWCH_QP_ATTR_NEXT_STATE,
                                     &attrs, 1);
                }
                __state_set(&ep->com, ABORTING);
                break;
        default:
                printk(KERN_ERR "%s unexpected state ep %p state %u\n",
                        __func__, ep, ep->com.state);
                WARN_ON(1);
                abort = 0;
        }
        spin_unlock_irqrestore(&ep->com.lock, flags);
        if (abort)
                abort_connection(ep, NULL, GFP_ATOMIC);
        put_ep(&ep->com);
}

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

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

int iwch_accept_cr(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
{
        int err;
        struct iwch_qp_attributes attrs;
        enum iwch_qp_attr_mask mask;
        struct iwch_ep *ep = to_ep(cm_id);
        struct iwch_dev *h = to_iwch_dev(cm_id->device);
        struct iwch_qp *qp = get_qhp(h, conn_param->qpn);

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

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

        if ((conn_param->ord > qp->rhp->attr.max_rdma_read_qp_depth) ||
            (conn_param->ird > qp->rhp->attr.max_rdma_reads_per_qp)) {
                abort_connection(ep, NULL, GFP_KERNEL);
                return -EINVAL;
        }

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

        ep->com.rpl_done = 0;
        ep->com.rpl_err = 0;
        ep->ird = conn_param->ird;
        ep->ord = conn_param->ord;
        PDBG("%s %d ird %d ord %d\n", __func__, __LINE__, ep->ird, ep->ord);

        get_ep(&ep->com);

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

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

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

        /* if needed, wait for wr_ack */
        if (iwch_rqes_posted(qp)) {
                wait_event(ep->com.waitq, ep->com.rpl_done);
                err = ep->com.rpl_err;
                if (err)
                        goto err;
        }

        err = send_mpa_reply(ep, conn_param->private_data,
                             conn_param->private_data_len);
        if (err)
                goto err;


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

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

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

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

        if (is_loopback_dst(cm_id)) {
                err = -ENOSYS;
                goto out;
        }

        ep = alloc_ep(sizeof(*ep), GFP_KERNEL);
        if (!ep) {
                printk(KERN_ERR MOD "%s - cannot alloc ep.\n", __func__);
                err = -ENOMEM;
                goto out;
        }
        init_timer(&ep->timer);
        ep->plen = conn_param->private_data_len;
        if (ep->plen)
                memcpy(ep->mpa_pkt + sizeof(struct mpa_message),
                       conn_param->private_data, ep->plen);
        ep->ird = conn_param->ird;
        ep->ord = conn_param->ord;
        ep->com.tdev = h->rdev.t3cdev_p;

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

        /*
         * Allocate an active TID to initiate a TCP connection.
         */
        ep->atid = cxgb3_alloc_atid(h->rdev.t3cdev_p, &t3c_client, ep);
        if (ep->atid == -1) {
                printk(KERN_ERR MOD "%s - cannot alloc atid.\n", __func__);
                err = -ENOMEM;
                goto fail2;
        }

        /* find a route */
        rt = find_route(h->rdev.t3cdev_p,
                        cm_id->local_addr.sin_addr.s_addr,
                        cm_id->remote_addr.sin_addr.s_addr,
                        cm_id->local_addr.sin_port,
                        cm_id->remote_addr.sin_port, IPTOS_LOWDELAY);
        if (!rt) {
                printk(KERN_ERR MOD "%s - cannot find route.\n", __func__);
                err = -EHOSTUNREACH;
                goto fail3;
        }
        ep->dst = &rt->u.dst;

        /* get a l2t entry */
        ep->l2t = t3_l2t_get(ep->com.tdev, ep->dst->neighbour,
                             ep->dst->neighbour->dev);
        if (!ep->l2t) {
                printk(KERN_ERR MOD "%s - cannot alloc l2e.\n", __func__);
                err = -ENOMEM;
                goto fail4;
        }

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

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

        l2t_release(L2DATA(h->rdev.t3cdev_p), ep->l2t);
fail4:
        dst_release(ep->dst);
fail3:
        cxgb3_free_atid(ep->com.tdev, ep->atid);
fail2:
        cm_id->rem_ref(cm_id);
        put_ep(&ep->com);
out:
        return err;
}

int iwch_create_listen(struct iw_cm_id *cm_id, int backlog)
{
        int err = 0;
        struct iwch_dev *h = to_iwch_dev(cm_id->device);
        struct iwch_listen_ep *ep;


        might_sleep();

        ep = alloc_ep(sizeof(*ep), GFP_KERNEL);
        if (!ep) {
                printk(KERN_ERR MOD "%s - cannot alloc ep.\n", __func__);
                err = -ENOMEM;
                goto fail1;
        }
        PDBG("%s ep %p\n", __func__, ep);
        ep->com.tdev = h->rdev.t3cdev_p;
        cm_id->add_ref(cm_id);
        ep->com.cm_id = cm_id;
        ep->backlog = backlog;
        ep->com.local_addr = cm_id->local_addr;

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

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

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

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

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

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

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

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

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

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

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

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

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

        PDBG("%s ep %p redirect to dst %p l2t %p\n", __func__, ep, new,
             l2t);
        dst_hold(new);
        l2t_release(L2DATA(ep->com.tdev), ep->l2t);
        ep->l2t = l2t;
        dst_release(old);
        ep->dst = new;
        return 1;
}

/*
 * All the CM events are handled on a work queue to have a safe context.
 */
static int sched(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
        struct iwch_ep_common *epc = ctx;

        get_ep(epc);

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

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

static int set_tcb_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
        struct cpl_set_tcb_rpl *rpl = cplhdr(skb);

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

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

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

        /*
         * All upcalls from the T3 Core go to sched() to
         * schedule the processing on a work queue.
         */
        t3c_handlers[CPL_ACT_ESTABLISH] = sched;
        t3c_handlers[CPL_ACT_OPEN_RPL] = sched;
        t3c_handlers[CPL_RX_DATA] = sched;
        t3c_handlers[CPL_TX_DMA_ACK] = sched;
        t3c_handlers[CPL_ABORT_RPL_RSS] = sched;
        t3c_handlers[CPL_ABORT_RPL] = sched;
        t3c_handlers[CPL_PASS_OPEN_RPL] = sched;
        t3c_handlers[CPL_CLOSE_LISTSRV_RPL] = sched;
        t3c_handlers[CPL_PASS_ACCEPT_REQ] = sched;
        t3c_handlers[CPL_PASS_ESTABLISH] = sched;
        t3c_handlers[CPL_PEER_CLOSE] = sched;
        t3c_handlers[CPL_CLOSE_CON_RPL] = sched;
        t3c_handlers[CPL_ABORT_REQ_RSS] = sched;
        t3c_handlers[CPL_RDMA_TERMINATE] = sched;
        t3c_handlers[CPL_RDMA_EC_STATUS] = sched;
        t3c_handlers[CPL_SET_TCB_RPL] = set_tcb_rpl;

        /*
         * These are the real handlers that are called from a
         * work queue.
         */
        work_handlers[CPL_ACT_ESTABLISH] = act_establish;
        work_handlers[CPL_ACT_OPEN_RPL] = act_open_rpl;
        work_handlers[CPL_RX_DATA] = rx_data;
        work_handlers[CPL_TX_DMA_ACK] = tx_ack;
        work_handlers[CPL_ABORT_RPL_RSS] = abort_rpl;
        work_handlers[CPL_ABORT_RPL] = abort_rpl;
        work_handlers[CPL_PASS_OPEN_RPL] = pass_open_rpl;
        work_handlers[CPL_CLOSE_LISTSRV_RPL] = close_listsrv_rpl;
        work_handlers[CPL_PASS_ACCEPT_REQ] = pass_accept_req;
        work_handlers[CPL_PASS_ESTABLISH] = pass_establish;
        work_handlers[CPL_PEER_CLOSE] = peer_close;
        work_handlers[CPL_ABORT_REQ_RSS] = peer_abort;
        work_handlers[CPL_CLOSE_CON_RPL] = close_con_rpl;
        work_handlers[CPL_RDMA_TERMINATE] = terminate;
        work_handlers[CPL_RDMA_EC_STATUS] = ec_status;
        return 0;
}

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