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   1 /*
   2  * Copyright (c) 2006 - 2009 Intel-NE, Inc.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34
  35 #define TCPOPT_TIMESTAMP 8
  36
  37 #include <asm/atomic.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/ip.h>
  40 #include <linux/tcp.h>
  41 #include <linux/init.h>
  42 #include <linux/if_arp.h>
  43 #include <linux/if_vlan.h>
  44 #include <linux/notifier.h>
  45 #include <linux/net.h>
  46 #include <linux/types.h>
  47 #include <linux/timer.h>
  48 #include <linux/time.h>
  49 #include <linux/delay.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/random.h>
  53 #include <linux/list.h>
  54 #include <linux/threads.h>
  55 #include <net/arp.h>
  56 #include <net/neighbour.h>
  57 #include <net/route.h>
  58 #include <net/ip_fib.h>
  59
  60 #include "nes.h"
  61
  62 u32 cm_packets_sent;
  63 u32 cm_packets_bounced;
  64 u32 cm_packets_dropped;
  65 u32 cm_packets_retrans;
  66 u32 cm_packets_created;
  67 u32 cm_packets_received;
  68 u32 cm_listens_created;
  69 u32 cm_listens_destroyed;
  70 u32 cm_backlog_drops;
  71 atomic_t cm_loopbacks;
  72 atomic_t cm_nodes_created;
  73 atomic_t cm_nodes_destroyed;
  74 atomic_t cm_accel_dropped_pkts;
  75 atomic_t cm_resets_recvd;
  76
  77 static inline int mini_cm_accelerated(struct nes_cm_core *,
  78         struct nes_cm_node *);
  79 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
  80         struct nes_vnic *, struct nes_cm_info *);
  81 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
  82 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *,
  83         struct nes_vnic *, u16, void *, struct nes_cm_info *);
  84 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
  85 static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
  86         struct nes_cm_node *);
  87 static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
  88         struct nes_cm_node *);
  89 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *,
  90         struct sk_buff *);
  91 static int mini_cm_dealloc_core(struct nes_cm_core *);
  92 static int mini_cm_get(struct nes_cm_core *);
  93 static int mini_cm_set(struct nes_cm_core *, u32, u32);
  94
  95 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *,
  96         void *, u32, void *, u32, u8);
  97 static int add_ref_cm_node(struct nes_cm_node *);
  98 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
  99
 100 static int nes_cm_disconn_true(struct nes_qp *);
 101 static int nes_cm_post_event(struct nes_cm_event *event);
 102 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
 103 static void nes_disconnect_worker(struct work_struct *work);
 104
 105 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
 106 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
 107 static int send_reset(struct nes_cm_node *, struct sk_buff *);
 108 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
 109 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
 110 static void process_packet(struct nes_cm_node *, struct sk_buff *,
 111         struct nes_cm_core *);
 112
 113 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
 114 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
 115 static void cleanup_retrans_entry(struct nes_cm_node *);
 116 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *,
 117         enum nes_cm_event_type);
 118 static void free_retrans_entry(struct nes_cm_node *cm_node);
 119 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
 120         struct sk_buff *skb, int optionsize, int passive);
 121
 122 /* CM event handler functions */
 123 static void cm_event_connected(struct nes_cm_event *);
 124 static void cm_event_connect_error(struct nes_cm_event *);
 125 static void cm_event_reset(struct nes_cm_event *);
 126 static void cm_event_mpa_req(struct nes_cm_event *);
 127
 128 static void print_core(struct nes_cm_core *core);
 129
 130 /* External CM API Interface */
 131 /* instance of function pointers for client API */
 132 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
 133 static struct nes_cm_ops nes_cm_api = {
 134         mini_cm_accelerated,
 135         mini_cm_listen,
 136         mini_cm_del_listen,
 137         mini_cm_connect,
 138         mini_cm_close,
 139         mini_cm_accept,
 140         mini_cm_reject,
 141         mini_cm_recv_pkt,
 142         mini_cm_dealloc_core,
 143         mini_cm_get,
 144         mini_cm_set
 145 };
 146
 147 static struct nes_cm_core *g_cm_core;
 148
 149 atomic_t cm_connects;
 150 atomic_t cm_accepts;
 151 atomic_t cm_disconnects;
 152 atomic_t cm_closes;
 153 atomic_t cm_connecteds;
 154 atomic_t cm_connect_reqs;
 155 atomic_t cm_rejects;
 156
 157
 158 /**
 159  * create_event
 160  */
 161 static struct nes_cm_event *create_event(struct nes_cm_node *cm_node,
 162                 enum nes_cm_event_type type)
 163 {
 164         struct nes_cm_event *event;
 165
 166         if (!cm_node->cm_id)
 167                 return NULL;
 168
 169         /* allocate an empty event */
 170         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 171
 172         if (!event)
 173                 return NULL;
 174
 175         event->type = type;
 176         event->cm_node = cm_node;
 177         event->cm_info.rem_addr = cm_node->rem_addr;
 178         event->cm_info.loc_addr = cm_node->loc_addr;
 179         event->cm_info.rem_port = cm_node->rem_port;
 180         event->cm_info.loc_port = cm_node->loc_port;
 181         event->cm_info.cm_id = cm_node->cm_id;
 182
 183         nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
 184                 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
 185                 cm_node, event, type, event->cm_info.loc_addr,
 186                 event->cm_info.loc_port, event->cm_info.rem_addr,
 187                 event->cm_info.rem_port);
 188
 189         nes_cm_post_event(event);
 190         return event;
 191 }
 192
 193
 194 /**
 195  * send_mpa_request
 196  */
 197 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
 198 {
 199         int ret;
 200         if (!skb) {
 201                 nes_debug(NES_DBG_CM, "skb set to NULL\n");
 202                 return -1;
 203         }
 204
 205         /* send an MPA Request frame */
 206         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 207                         cm_node->mpa_frame_size, SET_ACK);
 208
 209         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 210         if (ret < 0)
 211                 return ret;
 212
 213         return 0;
 214 }
 215
 216
 217 /**
 218  * recv_mpa - process a received TCP pkt, we are expecting an
 219  * IETF MPA frame
 220  */
 221 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 len)
 222 {
 223         struct ietf_mpa_frame *mpa_frame;
 224
 225         /* assume req frame is in tcp data payload */
 226         if (len < sizeof(struct ietf_mpa_frame)) {
 227                 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
 228                 return -1;
 229         }
 230
 231         mpa_frame = (struct ietf_mpa_frame *)buffer;
 232         cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
 233
 234         if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
 235                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
 236                                 " complete (%x + %x != %x)\n",
 237                                 cm_node->mpa_frame_size, (u32)sizeof(struct ietf_mpa_frame), len);
 238                 return -1;
 239         }
 240
 241         /* copy entire MPA frame to our cm_node's frame */
 242         memcpy(cm_node->mpa_frame_buf, buffer + sizeof(struct ietf_mpa_frame),
 243                         cm_node->mpa_frame_size);
 244
 245         return 0;
 246 }
 247
 248
 249 /**
 250  * form_cm_frame - get a free packet and build empty frame Use
 251  * node info to build.
 252  */
 253 static void form_cm_frame(struct sk_buff *skb,
 254         struct nes_cm_node *cm_node, void *options, u32 optionsize,
 255         void *data, u32 datasize, u8 flags)
 256 {
 257         struct tcphdr *tcph;
 258         struct iphdr *iph;
 259         struct ethhdr *ethh;
 260         u8 *buf;
 261         u16 packetsize = sizeof(*iph);
 262
 263         packetsize += sizeof(*tcph);
 264         packetsize +=  optionsize + datasize;
 265
 266         memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
 267
 268         skb->len = 0;
 269         buf = skb_put(skb, packetsize + ETH_HLEN);
 270
 271         ethh = (struct ethhdr *) buf;
 272         buf += ETH_HLEN;
 273
 274         iph = (struct iphdr *)buf;
 275         buf += sizeof(*iph);
 276         tcph = (struct tcphdr *)buf;
 277         skb_reset_mac_header(skb);
 278         skb_set_network_header(skb, ETH_HLEN);
 279         skb_set_transport_header(skb, ETH_HLEN+sizeof(*iph));
 280         buf += sizeof(*tcph);
 281
 282         skb->ip_summed = CHECKSUM_PARTIAL;
 283         skb->protocol = htons(0x800);
 284         skb->data_len = 0;
 285         skb->mac_len = ETH_HLEN;
 286
 287         memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
 288         memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
 289         ethh->h_proto = htons(0x0800);
 290
 291         iph->version = IPVERSION;
 292         iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
 293         iph->tos = 0;
 294         iph->tot_len = htons(packetsize);
 295         iph->id = htons(++cm_node->tcp_cntxt.loc_id);
 296
 297         iph->frag_off = htons(0x4000);
 298         iph->ttl = 0x40;
 299         iph->protocol = 0x06;   /* IPPROTO_TCP */
 300
 301         iph->saddr = htonl(cm_node->loc_addr);
 302         iph->daddr = htonl(cm_node->rem_addr);
 303
 304         tcph->source = htons(cm_node->loc_port);
 305         tcph->dest = htons(cm_node->rem_port);
 306         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
 307
 308         if (flags & SET_ACK) {
 309                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
 310                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
 311                 tcph->ack = 1;
 312         } else
 313                 tcph->ack_seq = 0;
 314
 315         if (flags & SET_SYN) {
 316                 cm_node->tcp_cntxt.loc_seq_num++;
 317                 tcph->syn = 1;
 318         } else
 319                 cm_node->tcp_cntxt.loc_seq_num += datasize;
 320
 321         if (flags & SET_FIN) {
 322                 cm_node->tcp_cntxt.loc_seq_num++;
 323                 tcph->fin = 1;
 324         }
 325
 326         if (flags & SET_RST)
 327                 tcph->rst = 1;
 328
 329         tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
 330         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
 331         tcph->urg_ptr = 0;
 332         if (optionsize)
 333                 memcpy(buf, options, optionsize);
 334         buf += optionsize;
 335         if (datasize)
 336                 memcpy(buf, data, datasize);
 337
 338         skb_shinfo(skb)->nr_frags = 0;
 339         cm_packets_created++;
 340
 341 }
 342
 343
 344 /**
 345  * print_core - dump a cm core
 346  */
 347 static void print_core(struct nes_cm_core *core)
 348 {
 349         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 350         nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
 351         if (!core)
 352                 return;
 353         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 354
 355         nes_debug(NES_DBG_CM, "State         : %u \n",  core->state);
 356
 357         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
 358         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
 359
 360         nes_debug(NES_DBG_CM, "core          : %p \n", core);
 361
 362         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
 363 }
 364
 365
 366 /**
 367  * schedule_nes_timer
 368  * note - cm_node needs to be protected before calling this. Encase in:
 369  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 370  */
 371 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
 372                 enum nes_timer_type type, int send_retrans,
 373                 int close_when_complete)
 374 {
 375         unsigned long  flags;
 376         struct nes_cm_core *cm_core = cm_node->cm_core;
 377         struct nes_timer_entry *new_send;
 378         int ret = 0;
 379         u32 was_timer_set;
 380
 381         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
 382         if (!new_send)
 383                 return -1;
 384
 385         /* new_send->timetosend = currenttime */
 386         new_send->retrycount = NES_DEFAULT_RETRYS;
 387         new_send->retranscount = NES_DEFAULT_RETRANS;
 388         new_send->skb = skb;
 389         new_send->timetosend = jiffies;
 390         new_send->type = type;
 391         new_send->netdev = cm_node->netdev;
 392         new_send->send_retrans = send_retrans;
 393         new_send->close_when_complete = close_when_complete;
 394
 395         if (type == NES_TIMER_TYPE_CLOSE) {
 396                 new_send->timetosend += (HZ/10);
 397                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
 398                 list_add_tail(&new_send->list, &cm_node->recv_list);
 399                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
 400         }
 401
 402         if (type == NES_TIMER_TYPE_SEND) {
 403                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 404                 atomic_inc(&new_send->skb->users);
 405                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 406                 cm_node->send_entry = new_send;
 407                 add_ref_cm_node(cm_node);
 408                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 409                 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
 410
 411                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
 412                 if (ret != NETDEV_TX_OK) {
 413                         nes_debug(NES_DBG_CM, "Error sending packet %p "
 414                                 "(jiffies = %lu)\n", new_send, jiffies);
 415                         atomic_dec(&new_send->skb->users);
 416                         new_send->timetosend = jiffies;
 417                 } else {
 418                         cm_packets_sent++;
 419                         if (!send_retrans) {
 420                                 cleanup_retrans_entry(cm_node);
 421                                 if (close_when_complete)
 422                                         rem_ref_cm_node(cm_core, cm_node);
 423                                 return ret;
 424                         }
 425                 }
 426         }
 427
 428         was_timer_set = timer_pending(&cm_core->tcp_timer);
 429
 430         if (!was_timer_set) {
 431                 cm_core->tcp_timer.expires = new_send->timetosend;
 432                 add_timer(&cm_core->tcp_timer);
 433         }
 434
 435         return ret;
 436 }
 437
 438
 439 /**
 440  * nes_cm_timer_tick
 441  */
 442 static void nes_cm_timer_tick(unsigned long pass)
 443 {
 444         unsigned long flags, qplockflags;
 445         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
 446         struct iw_cm_id *cm_id;
 447         struct nes_cm_node *cm_node;
 448         struct nes_timer_entry *send_entry, *recv_entry;
 449         struct list_head *list_core, *list_core_temp;
 450         struct list_head *list_node, *list_node_temp;
 451         struct nes_cm_core *cm_core = g_cm_core;
 452         struct nes_qp *nesqp;
 453         u32 settimer = 0;
 454         int ret = NETDEV_TX_OK;
 455         enum nes_cm_node_state last_state;
 456
 457         struct list_head timer_list;
 458         INIT_LIST_HEAD(&timer_list);
 459         spin_lock_irqsave(&cm_core->ht_lock, flags);
 460
 461         list_for_each_safe(list_node, list_core_temp,
 462                                 &cm_core->connected_nodes) {
 463                 cm_node = container_of(list_node, struct nes_cm_node, list);
 464                 if (!list_empty(&cm_node->recv_list) || (cm_node->send_entry)) {
 465                         add_ref_cm_node(cm_node);
 466                         list_add(&cm_node->timer_entry, &timer_list);
 467                 }
 468         }
 469         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 470
 471         list_for_each_safe(list_node, list_core_temp, &timer_list) {
 472                 cm_node = container_of(list_node, struct nes_cm_node,
 473                                         timer_entry);
 474                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
 475                 list_for_each_safe(list_core, list_node_temp,
 476                         &cm_node->recv_list) {
 477                         recv_entry = container_of(list_core,
 478                                 struct nes_timer_entry, list);
 479                         if (!recv_entry)
 480                                 break;
 481                         if (time_after(recv_entry->timetosend, jiffies)) {
 482                                 if (nexttimeout > recv_entry->timetosend ||
 483                                         !settimer) {
 484                                         nexttimeout = recv_entry->timetosend;
 485                                         settimer = 1;
 486                                 }
 487                                 continue;
 488                         }
 489                         list_del(&recv_entry->list);
 490                         cm_id = cm_node->cm_id;
 491                         spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
 492                         nesqp = (struct nes_qp *)recv_entry->skb;
 493                         spin_lock_irqsave(&nesqp->lock, qplockflags);
 494                         if (nesqp->cm_id) {
 495                                 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 496                                         "refcount = %d: HIT A "
 497                                         "NES_TIMER_TYPE_CLOSE with something "
 498                                         "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 499                                         atomic_read(&nesqp->refcount));
 500                                 nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
 501                                 nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
 502                                 nesqp->ibqp_state = IB_QPS_ERR;
 503                                 spin_unlock_irqrestore(&nesqp->lock,
 504                                         qplockflags);
 505                                 nes_cm_disconn(nesqp);
 506                         } else {
 507                                 spin_unlock_irqrestore(&nesqp->lock,
 508                                         qplockflags);
 509                                 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 510                                         "refcount = %d: HIT A "
 511                                         "NES_TIMER_TYPE_CLOSE with nothing "
 512                                         "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 513                                         atomic_read(&nesqp->refcount));
 514                         }
 515                         if (cm_id)
 516                                 cm_id->rem_ref(cm_id);
 517
 518                         kfree(recv_entry);
 519                         spin_lock_irqsave(&cm_node->recv_list_lock, flags);
 520                 }
 521                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
 522
 523                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 524                 do {
 525                         send_entry = cm_node->send_entry;
 526                         if (!send_entry)
 527                                 break;
 528                         if (time_after(send_entry->timetosend, jiffies)) {
 529                                 if (cm_node->state != NES_CM_STATE_TSA) {
 530                                         if ((nexttimeout >
 531                                                 send_entry->timetosend) ||
 532                                                 !settimer) {
 533                                                 nexttimeout =
 534                                                         send_entry->timetosend;
 535                                                 settimer = 1;
 536                                                 break;
 537                                         }
 538                                 } else {
 539                                         free_retrans_entry(cm_node);
 540                                         break;
 541                                 }
 542                         }
 543
 544                         if ((cm_node->state == NES_CM_STATE_TSA) ||
 545                                 (cm_node->state == NES_CM_STATE_CLOSED)) {
 546                                 free_retrans_entry(cm_node);
 547                                 break;
 548                         }
 549
 550                         if (!send_entry->retranscount ||
 551                                 !send_entry->retrycount) {
 552                                 cm_packets_dropped++;
 553                                 last_state = cm_node->state;
 554                                 cm_node->state = NES_CM_STATE_CLOSED;
 555                                 free_retrans_entry(cm_node);
 556                                 spin_unlock_irqrestore(
 557                                         &cm_node->retrans_list_lock, flags);
 558                                 if (last_state == NES_CM_STATE_SYN_RCVD)
 559                                         rem_ref_cm_node(cm_core, cm_node);
 560                                 else
 561                                         create_event(cm_node,
 562                                                 NES_CM_EVENT_ABORTED);
 563                                 spin_lock_irqsave(&cm_node->retrans_list_lock,
 564                                         flags);
 565                                 break;
 566                         }
 567                         atomic_inc(&send_entry->skb->users);
 568                         cm_packets_retrans++;
 569                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
 570                                 "for node %p, jiffies = %lu, time to send = "
 571                                 "%lu, retranscount = %u, send_entry->seq_num = "
 572                                 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
 573                                 "0x%08X\n", send_entry, cm_node, jiffies,
 574                                 send_entry->timetosend,
 575                                 send_entry->retranscount,
 576                                 send_entry->seq_num,
 577                                 cm_node->tcp_cntxt.rem_ack_num);
 578
 579                         spin_unlock_irqrestore(&cm_node->retrans_list_lock,
 580                                 flags);
 581                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
 582                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 583                         if (ret != NETDEV_TX_OK) {
 584                                 nes_debug(NES_DBG_CM, "rexmit failed for "
 585                                         "node=%p\n", cm_node);
 586                                 cm_packets_bounced++;
 587                                 atomic_dec(&send_entry->skb->users);
 588                                 send_entry->retrycount--;
 589                                 nexttimeout = jiffies + NES_SHORT_TIME;
 590                                 settimer = 1;
 591                                 break;
 592                         } else {
 593                                 cm_packets_sent++;
 594                         }
 595                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
 596                                 "%u, retry count = %u.\n",
 597                                 send_entry->retranscount,
 598                                 send_entry->retrycount);
 599                         if (send_entry->send_retrans) {
 600                                 send_entry->retranscount--;
 601                                 send_entry->timetosend = jiffies +
 602                                         NES_RETRY_TIMEOUT;
 603                                 if (nexttimeout > send_entry->timetosend ||
 604                                         !settimer) {
 605                                         nexttimeout = send_entry->timetosend;
 606                                         settimer = 1;
 607                                 }
 608                         } else {
 609                                 int close_when_complete;
 610                                 close_when_complete =
 611                                         send_entry->close_when_complete;
 612                                 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
 613                                         cm_node, cm_node->state);
 614                                 free_retrans_entry(cm_node);
 615                                 if (close_when_complete)
 616                                         rem_ref_cm_node(cm_node->cm_core,
 617                                                 cm_node);
 618                         }
 619                 } while (0);
 620
 621                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 622                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 623                 if (ret != NETDEV_TX_OK) {
 624                         nes_debug(NES_DBG_CM, "rexmit failed for cm_node=%p\n",
 625                                 cm_node);
 626                         break;
 627                 }
 628         }
 629
 630         if (settimer) {
 631                 if (!timer_pending(&cm_core->tcp_timer)) {
 632                         cm_core->tcp_timer.expires  = nexttimeout;
 633                         add_timer(&cm_core->tcp_timer);
 634                 }
 635         }
 636 }
 637
 638
 639 /**
 640  * send_syn
 641  */
 642 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
 643         struct sk_buff *skb)
 644 {
 645         int ret;
 646         int flags = SET_SYN;
 647         char optionsbuffer[sizeof(struct option_mss) +
 648                 sizeof(struct option_windowscale) + sizeof(struct option_base) +
 649                 TCP_OPTIONS_PADDING];
 650
 651         int optionssize = 0;
 652         /* Sending MSS option */
 653         union all_known_options *options;
 654
 655         if (!cm_node)
 656                 return -EINVAL;
 657
 658         options = (union all_known_options *)&optionsbuffer[optionssize];
 659         options->as_mss.optionnum = OPTION_NUMBER_MSS;
 660         options->as_mss.length = sizeof(struct option_mss);
 661         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
 662         optionssize += sizeof(struct option_mss);
 663
 664         options = (union all_known_options *)&optionsbuffer[optionssize];
 665         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
 666         options->as_windowscale.length = sizeof(struct option_windowscale);
 667         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
 668         optionssize += sizeof(struct option_windowscale);
 669
 670         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
 671                 options = (union all_known_options *)&optionsbuffer[optionssize];
 672                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
 673                 options->as_base.length = sizeof(struct option_base);
 674                 optionssize += sizeof(struct option_base);
 675                 /* we need the size to be a multiple of 4 */
 676                 options = (union all_known_options *)&optionsbuffer[optionssize];
 677                 options->as_end = 1;
 678                 optionssize += 1;
 679                 options = (union all_known_options *)&optionsbuffer[optionssize];
 680                 options->as_end = 1;
 681                 optionssize += 1;
 682         }
 683
 684         options = (union all_known_options *)&optionsbuffer[optionssize];
 685         options->as_end = OPTION_NUMBER_END;
 686         optionssize += 1;
 687
 688         if (!skb)
 689                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 690         if (!skb) {
 691                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 692                 return -1;
 693         }
 694
 695         if (sendack)
 696                 flags |= SET_ACK;
 697
 698         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
 699         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 700
 701         return ret;
 702 }
 703
 704
 705 /**
 706  * send_reset
 707  */
 708 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
 709 {
 710         int ret;
 711         int flags = SET_RST | SET_ACK;
 712
 713         if (!skb)
 714                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 715         if (!skb) {
 716                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 717                 return -1;
 718         }
 719
 720         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
 721         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
 722
 723         return ret;
 724 }
 725
 726
 727 /**
 728  * send_ack
 729  */
 730 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
 731 {
 732         int ret;
 733
 734         if (!skb)
 735                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 736
 737         if (!skb) {
 738                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 739                 return -1;
 740         }
 741
 742         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
 743         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
 744
 745         return ret;
 746 }
 747
 748
 749 /**
 750  * send_fin
 751  */
 752 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
 753 {
 754         int ret;
 755
 756         /* if we didn't get a frame get one */
 757         if (!skb)
 758                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 759
 760         if (!skb) {
 761                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 762                 return -1;
 763         }
 764
 765         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
 766         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 767
 768         return ret;
 769 }
 770
 771
 772 /**
 773  * find_node - find a cm node that matches the reference cm node
 774  */
 775 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
 776                 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
 777 {
 778         unsigned long flags;
 779         struct list_head *hte;
 780         struct nes_cm_node *cm_node;
 781
 782         /* get a handle on the hte */
 783         hte = &cm_core->connected_nodes;
 784
 785         /* walk list and find cm_node associated with this session ID */
 786         spin_lock_irqsave(&cm_core->ht_lock, flags);
 787         list_for_each_entry(cm_node, hte, list) {
 788                 /* compare quad, return node handle if a match */
 789                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
 790                                 cm_node->loc_addr, cm_node->loc_port,
 791                                 loc_addr, loc_port,
 792                                 cm_node->rem_addr, cm_node->rem_port,
 793                                 rem_addr, rem_port);
 794                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
 795                                 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
 796                         add_ref_cm_node(cm_node);
 797                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 798                         return cm_node;
 799                 }
 800         }
 801         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 802
 803         /* no owner node */
 804         return NULL;
 805 }
 806
 807
 808 /**
 809  * find_listener - find a cm node listening on this addr-port pair
 810  */
 811 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
 812                 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
 813 {
 814         unsigned long flags;
 815         struct nes_cm_listener *listen_node;
 816         __be32 tmp_addr = cpu_to_be32(dst_addr);
 817
 818         /* walk list and find cm_node associated with this session ID */
 819         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 820         list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
 821                 /* compare node pair, return node handle if a match */
 822                 if (((listen_node->loc_addr == dst_addr) ||
 823                                 listen_node->loc_addr == 0x00000000) &&
 824                                 (listen_node->loc_port == dst_port) &&
 825                                 (listener_state & listen_node->listener_state)) {
 826                         atomic_inc(&listen_node->ref_count);
 827                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 828                         return listen_node;
 829                 }
 830         }
 831         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 832
 833         nes_debug(NES_DBG_CM, "Unable to find listener for %pI4:%x\n",
 834                   &tmp_addr, dst_port);
 835
 836         /* no listener */
 837         return NULL;
 838 }
 839
 840
 841 /**
 842  * add_hte_node - add a cm node to the hash table
 843  */
 844 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
 845 {
 846         unsigned long flags;
 847         struct list_head *hte;
 848
 849         if (!cm_node || !cm_core)
 850                 return -EINVAL;
 851
 852         nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
 853                 cm_node);
 854
 855         spin_lock_irqsave(&cm_core->ht_lock, flags);
 856
 857         /* get a handle on the hash table element (list head for this slot) */
 858         hte = &cm_core->connected_nodes;
 859         list_add_tail(&cm_node->list, hte);
 860         atomic_inc(&cm_core->ht_node_cnt);
 861
 862         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 863
 864         return 0;
 865 }
 866
 867
 868 /**
 869  * mini_cm_dec_refcnt_listen
 870  */
 871 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
 872         struct nes_cm_listener *listener, int free_hanging_nodes)
 873 {
 874         int ret = 1;
 875         unsigned long flags;
 876         struct list_head *list_pos = NULL;
 877         struct list_head *list_temp = NULL;
 878         struct nes_cm_node *cm_node = NULL;
 879         struct list_head reset_list;
 880
 881         nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
 882                 "refcnt=%d\n", listener, free_hanging_nodes,
 883                 atomic_read(&listener->ref_count));
 884         /* free non-accelerated child nodes for this listener */
 885         INIT_LIST_HEAD(&reset_list);
 886         if (free_hanging_nodes) {
 887                 spin_lock_irqsave(&cm_core->ht_lock, flags);
 888                 list_for_each_safe(list_pos, list_temp,
 889                                    &g_cm_core->connected_nodes) {
 890                         cm_node = container_of(list_pos, struct nes_cm_node,
 891                                 list);
 892                         if ((cm_node->listener == listener) &&
 893                             (!cm_node->accelerated)) {
 894                                 add_ref_cm_node(cm_node);
 895                                 list_add(&cm_node->reset_entry, &reset_list);
 896                         }
 897                 }
 898                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 899         }
 900
 901         list_for_each_safe(list_pos, list_temp, &reset_list) {
 902                 cm_node = container_of(list_pos, struct nes_cm_node,
 903                                         reset_entry);
 904                 cleanup_retrans_entry(cm_node);
 905                 send_reset(cm_node, NULL);
 906                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 907         }
 908
 909         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 910         if (!atomic_dec_return(&listener->ref_count)) {
 911                 list_del(&listener->list);
 912
 913                 /* decrement our listen node count */
 914                 atomic_dec(&cm_core->listen_node_cnt);
 915
 916                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 917
 918                 if (listener->nesvnic) {
 919                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
 920                                         PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
 921                 }
 922
 923                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
 924
 925                 kfree(listener);
 926                 listener = NULL;
 927                 ret = 0;
 928                 cm_listens_destroyed++;
 929         } else {
 930                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 931         }
 932         if (listener) {
 933                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
 934                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
 935                                         " with non-zero pending accepts=%u\n",
 936                                         listener, atomic_read(&listener->pend_accepts_cnt));
 937         }
 938
 939         return ret;
 940 }
 941
 942
 943 /**
 944  * mini_cm_del_listen
 945  */
 946 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
 947                 struct nes_cm_listener *listener)
 948 {
 949         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
 950         listener->cm_id = NULL; /* going to be destroyed pretty soon */
 951         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
 952 }
 953
 954
 955 /**
 956  * mini_cm_accelerated
 957  */
 958 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
 959                 struct nes_cm_node *cm_node)
 960 {
 961         u32 was_timer_set;
 962         cm_node->accelerated = 1;
 963
 964         if (cm_node->accept_pend) {
 965                 BUG_ON(!cm_node->listener);
 966                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
 967                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
 968         }
 969
 970         was_timer_set = timer_pending(&cm_core->tcp_timer);
 971         if (!was_timer_set) {
 972                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
 973                 add_timer(&cm_core->tcp_timer);
 974         }
 975
 976         return 0;
 977 }
 978
 979
 980 /**
 981  * nes_addr_resolve_neigh
 982  */
 983 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
 984 {
 985         struct rtable *rt;
 986         struct flowi fl;
 987         struct neighbour *neigh;
 988         int rc = -1;
 989
 990         memset(&fl, 0, sizeof fl);
 991         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
 992         if (ip_route_output_key(&init_net, &rt, &fl)) {
 993                 printk("%s: ip_route_output_key failed for 0x%08X\n",
 994                                 __func__, dst_ip);
 995                 return rc;
 996         }
 997
 998         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, nesvnic->netdev);
 999         if (neigh) {
1000                 if (neigh->nud_state & NUD_VALID) {
1001                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1002                                   " is %pM, Gateway is 0x%08X \n", dst_ip,
1003                                   neigh->ha, ntohl(rt->rt_gateway));
1004                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1005                                              dst_ip, NES_ARP_ADD);
1006                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1007                                            NES_ARP_RESOLVE);
1008                 }
1009                 neigh_release(neigh);
1010         }
1011
1012         if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
1013                 neigh_event_send(rt->u.dst.neighbour, NULL);
1014
1015         ip_rt_put(rt);
1016         return rc;
1017 }
1018
1019
1020 /**
1021  * make_cm_node - create a new instance of a cm node
1022  */
1023 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1024                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1025                 struct nes_cm_listener *listener)
1026 {
1027         struct nes_cm_node *cm_node;
1028         struct timespec ts;
1029         int arpindex = 0;
1030         struct nes_device *nesdev;
1031         struct nes_adapter *nesadapter;
1032
1033         /* create an hte and cm_node for this instance */
1034         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1035         if (!cm_node)
1036                 return NULL;
1037
1038         /* set our node specific transport info */
1039         cm_node->loc_addr = cm_info->loc_addr;
1040         cm_node->rem_addr = cm_info->rem_addr;
1041         cm_node->loc_port = cm_info->loc_port;
1042         cm_node->rem_port = cm_info->rem_port;
1043         cm_node->send_write0 = send_first;
1044         nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1045                   &cm_node->loc_addr, cm_node->loc_port,
1046                   &cm_node->rem_addr, cm_node->rem_port);
1047         cm_node->listener = listener;
1048         cm_node->netdev = nesvnic->netdev;
1049         cm_node->cm_id = cm_info->cm_id;
1050         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1051
1052         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1053                         cm_node->cm_id);
1054
1055         spin_lock_init(&cm_node->retrans_list_lock);
1056         INIT_LIST_HEAD(&cm_node->recv_list);
1057         spin_lock_init(&cm_node->recv_list_lock);
1058
1059         cm_node->loopbackpartner = NULL;
1060         atomic_set(&cm_node->ref_count, 1);
1061         /* associate our parent CM core */
1062         cm_node->cm_core = cm_core;
1063         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1064         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1065         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1066                         NES_CM_DEFAULT_RCV_WND_SCALE;
1067         ts = current_kernel_time();
1068         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1069         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1070                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1071         cm_node->tcp_cntxt.rcv_nxt = 0;
1072         /* get a unique session ID , add thread_id to an upcounter to handle race */
1073         atomic_inc(&cm_core->node_cnt);
1074         cm_node->conn_type = cm_info->conn_type;
1075         cm_node->apbvt_set = 0;
1076         cm_node->accept_pend = 0;
1077
1078         cm_node->nesvnic = nesvnic;
1079         /* get some device handles, for arp lookup */
1080         nesdev = nesvnic->nesdev;
1081         nesadapter = nesdev->nesadapter;
1082
1083         cm_node->loopbackpartner = NULL;
1084         /* get the mac addr for the remote node */
1085         if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
1086                 arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1087         else
1088                 arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1089         if (arpindex < 0) {
1090                 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr);
1091                 if (arpindex < 0) {
1092                         kfree(cm_node);
1093                         return NULL;
1094                 }
1095         }
1096
1097         /* copy the mac addr to node context */
1098         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1099         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1100                   cm_node->rem_mac);
1101
1102         add_hte_node(cm_core, cm_node);
1103         atomic_inc(&cm_nodes_created);
1104
1105         return cm_node;
1106 }
1107
1108
1109 /**
1110  * add_ref_cm_node - destroy an instance of a cm node
1111  */
1112 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1113 {
1114         atomic_inc(&cm_node->ref_count);
1115         return 0;
1116 }
1117
1118
1119 /**
1120  * rem_ref_cm_node - destroy an instance of a cm node
1121  */
1122 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1123         struct nes_cm_node *cm_node)
1124 {
1125         unsigned long flags, qplockflags;
1126         struct nes_timer_entry *recv_entry;
1127         struct iw_cm_id *cm_id;
1128         struct list_head *list_core, *list_node_temp;
1129         struct nes_qp *nesqp;
1130
1131         if (!cm_node)
1132                 return -EINVAL;
1133
1134         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1135         if (atomic_dec_return(&cm_node->ref_count)) {
1136                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1137                 return 0;
1138         }
1139         list_del(&cm_node->list);
1140         atomic_dec(&cm_core->ht_node_cnt);
1141         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1142
1143         /* if the node is destroyed before connection was accelerated */
1144         if (!cm_node->accelerated && cm_node->accept_pend) {
1145                 BUG_ON(!cm_node->listener);
1146                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1147                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1148         }
1149         BUG_ON(cm_node->send_entry);
1150         spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1151         list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
1152                 recv_entry = container_of(list_core, struct nes_timer_entry,
1153                                 list);
1154                 list_del(&recv_entry->list);
1155                 cm_id = cm_node->cm_id;
1156                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1157                 nesqp = (struct nes_qp *)recv_entry->skb;
1158                 spin_lock_irqsave(&nesqp->lock, qplockflags);
1159                 if (nesqp->cm_id) {
1160                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: HIT A "
1161                                 "NES_TIMER_TYPE_CLOSE with something to do!\n",
1162                                 nesqp->hwqp.qp_id, cm_id);
1163                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
1164                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
1165                         nesqp->ibqp_state = IB_QPS_ERR;
1166                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1167                         nes_cm_disconn(nesqp);
1168                 } else {
1169                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1170                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: HIT A "
1171                                 "NES_TIMER_TYPE_CLOSE with nothing to do!\n",
1172                                 nesqp->hwqp.qp_id, cm_id);
1173                 }
1174                 cm_id->rem_ref(cm_id);
1175
1176                 kfree(recv_entry);
1177                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1178         }
1179         spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1180
1181         if (cm_node->listener) {
1182                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1183         } else {
1184                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1185                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1186                                 PCI_FUNC(
1187                                 cm_node->nesvnic->nesdev->pcidev->devfn),
1188                                 NES_MANAGE_APBVT_DEL);
1189                 }
1190         }
1191
1192         atomic_dec(&cm_core->node_cnt);
1193         atomic_inc(&cm_nodes_destroyed);
1194         nesqp = cm_node->nesqp;
1195         if (nesqp) {
1196                 nesqp->cm_node = NULL;
1197                 nes_rem_ref(&nesqp->ibqp);
1198                 cm_node->nesqp = NULL;
1199         }
1200
1201         cm_node->freed = 1;
1202         kfree(cm_node);
1203         return 0;
1204 }
1205
1206 /**
1207  * process_options
1208  */
1209 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1210         u32 optionsize, u32 syn_packet)
1211 {
1212         u32 tmp;
1213         u32 offset = 0;
1214         union all_known_options *all_options;
1215         char got_mss_option = 0;
1216
1217         while (offset < optionsize) {
1218                 all_options = (union all_known_options *)(optionsloc + offset);
1219                 switch (all_options->as_base.optionnum) {
1220                 case OPTION_NUMBER_END:
1221                         offset = optionsize;
1222                         break;
1223                 case OPTION_NUMBER_NONE:
1224                         offset += 1;
1225                         continue;
1226                 case OPTION_NUMBER_MSS:
1227                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1228                                 "Size: %d\n", __func__,
1229                                 all_options->as_mss.length, offset, optionsize);
1230                         got_mss_option = 1;
1231                         if (all_options->as_mss.length != 4) {
1232                                 return 1;
1233                         } else {
1234                                 tmp = ntohs(all_options->as_mss.mss);
1235                                 if (tmp > 0 && tmp <
1236                                         cm_node->tcp_cntxt.mss)
1237                                         cm_node->tcp_cntxt.mss = tmp;
1238                         }
1239                         break;
1240                 case OPTION_NUMBER_WINDOW_SCALE:
1241                         cm_node->tcp_cntxt.snd_wscale =
1242                                 all_options->as_windowscale.shiftcount;
1243                         break;
1244                 case OPTION_NUMBER_WRITE0:
1245                         cm_node->send_write0 = 1;
1246                         break;
1247                 default:
1248                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1249                                 all_options->as_base.optionnum);
1250                         break;
1251                 }
1252                 offset += all_options->as_base.length;
1253         }
1254         if ((!got_mss_option) && (syn_packet))
1255                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1256         return 0;
1257 }
1258
1259 static void drop_packet(struct sk_buff *skb)
1260 {
1261         atomic_inc(&cm_accel_dropped_pkts);
1262         dev_kfree_skb_any(skb);
1263 }
1264
1265 static void handle_fin_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1266         struct tcphdr *tcph)
1267 {
1268         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1269                 "refcnt=%d\n", cm_node, cm_node->state,
1270                 atomic_read(&cm_node->ref_count));
1271         cm_node->tcp_cntxt.rcv_nxt++;
1272         cleanup_retrans_entry(cm_node);
1273         switch (cm_node->state) {
1274         case NES_CM_STATE_SYN_RCVD:
1275         case NES_CM_STATE_SYN_SENT:
1276         case NES_CM_STATE_ESTABLISHED:
1277         case NES_CM_STATE_MPAREQ_SENT:
1278                 cm_node->state = NES_CM_STATE_LAST_ACK;
1279                 send_fin(cm_node, skb);
1280                 break;
1281         case NES_CM_STATE_FIN_WAIT1:
1282                 cm_node->state = NES_CM_STATE_CLOSING;
1283                 send_ack(cm_node, skb);
1284                 break;
1285         case NES_CM_STATE_FIN_WAIT2:
1286                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1287                 send_ack(cm_node, skb);
1288                 cm_node->state = NES_CM_STATE_CLOSED;
1289                 break;
1290         case NES_CM_STATE_TSA:
1291         default:
1292                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1293                         cm_node, cm_node->state);
1294                 drop_packet(skb);
1295                 break;
1296         }
1297 }
1298
1299
1300 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1301         struct tcphdr *tcph)
1302 {
1303
1304         int     reset = 0;      /* whether to send reset in case of err.. */
1305         int     passive_state;
1306         atomic_inc(&cm_resets_recvd);
1307         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1308                         " refcnt=%d\n", cm_node, cm_node->state,
1309                         atomic_read(&cm_node->ref_count));
1310         cleanup_retrans_entry(cm_node);
1311         switch (cm_node->state) {
1312         case NES_CM_STATE_SYN_SENT:
1313         case NES_CM_STATE_MPAREQ_SENT:
1314                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1315                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1316                         cm_node->listener, cm_node->state);
1317                 active_open_err(cm_node, skb, reset);
1318                 break;
1319         case NES_CM_STATE_MPAREQ_RCVD:
1320                 passive_state = atomic_add_return(1, &cm_node->passive_state);
1321                 if (passive_state ==  NES_SEND_RESET_EVENT)
1322                         create_event(cm_node, NES_CM_EVENT_RESET);
1323                 cleanup_retrans_entry(cm_node);
1324                 cm_node->state = NES_CM_STATE_CLOSED;
1325                 dev_kfree_skb_any(skb);
1326                 break;
1327         case NES_CM_STATE_ESTABLISHED:
1328         case NES_CM_STATE_SYN_RCVD:
1329         case NES_CM_STATE_LISTENING:
1330                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1331                 passive_open_err(cm_node, skb, reset);
1332                 break;
1333         case NES_CM_STATE_TSA:
1334                 active_open_err(cm_node, skb, reset);
1335                 break;
1336         case NES_CM_STATE_CLOSED:
1337                 cleanup_retrans_entry(cm_node);
1338                 drop_packet(skb);
1339                 break;
1340         default:
1341                 drop_packet(skb);
1342                 break;
1343         }
1344 }
1345
1346 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb,
1347         enum nes_cm_event_type type)
1348 {
1349
1350         int     ret;
1351         int datasize = skb->len;
1352         u8 *dataloc = skb->data;
1353         ret = parse_mpa(cm_node, dataloc, datasize);
1354         if (ret < 0) {
1355                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1356                 if (type == NES_CM_EVENT_CONNECTED) {
1357                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1358                                 "cm_node=%p listener=%p state=%d\n", __func__,
1359                                 __LINE__, cm_node, cm_node->listener,
1360                                 cm_node->state);
1361                         active_open_err(cm_node, skb, 1);
1362                 } else {
1363                         passive_open_err(cm_node, skb, 1);
1364                 }
1365         } else {
1366                 cleanup_retrans_entry(cm_node);
1367                 dev_kfree_skb_any(skb);
1368                 if (type == NES_CM_EVENT_CONNECTED)
1369                         cm_node->state = NES_CM_STATE_TSA;
1370                 else
1371                         atomic_set(&cm_node->passive_state,
1372                                         NES_PASSIVE_STATE_INDICATED);
1373                 create_event(cm_node, type);
1374
1375         }
1376         return ;
1377 }
1378
1379 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1380 {
1381         switch (cm_node->state) {
1382         case NES_CM_STATE_SYN_SENT:
1383         case NES_CM_STATE_MPAREQ_SENT:
1384                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1385                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1386                         cm_node->listener, cm_node->state);
1387                 active_open_err(cm_node, skb, 1);
1388                 break;
1389         case NES_CM_STATE_ESTABLISHED:
1390         case NES_CM_STATE_SYN_RCVD:
1391                 passive_open_err(cm_node, skb, 1);
1392                 break;
1393         case NES_CM_STATE_TSA:
1394         default:
1395                 drop_packet(skb);
1396         }
1397 }
1398
1399 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1400         struct sk_buff *skb)
1401 {
1402         int err;
1403
1404         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1405         if (err)
1406                 active_open_err(cm_node, skb, 1);
1407
1408         return err;
1409 }
1410
1411 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1412         struct sk_buff *skb)
1413 {
1414         int err = 0;
1415         u32 seq;
1416         u32 ack_seq;
1417         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1418         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1419         u32 rcv_wnd;
1420         seq = ntohl(tcph->seq);
1421         ack_seq = ntohl(tcph->ack_seq);
1422         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1423         if (ack_seq != loc_seq_num)
1424                 err = 1;
1425         else if ((seq + rcv_wnd) < rcv_nxt)
1426                 err = 1;
1427         if (err) {
1428                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1429                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1430                         cm_node->listener, cm_node->state);
1431                 indicate_pkt_err(cm_node, skb);
1432                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1433                         "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1434                         rcv_wnd);
1435         }
1436         return err;
1437 }
1438
1439 /*
1440  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1441  * is created with a listener or it may comein as rexmitted packet which in
1442  * that case will be just dropped.
1443  */
1444
1445 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1446         struct tcphdr *tcph)
1447 {
1448         int ret;
1449         u32 inc_sequence;
1450         int optionsize;
1451
1452         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1453         skb_trim(skb, 0);
1454         inc_sequence = ntohl(tcph->seq);
1455
1456         switch (cm_node->state) {
1457         case NES_CM_STATE_SYN_SENT:
1458         case NES_CM_STATE_MPAREQ_SENT:
1459                 /* Rcvd syn on active open connection*/
1460                 active_open_err(cm_node, skb, 1);
1461                 break;
1462         case NES_CM_STATE_LISTENING:
1463                 /* Passive OPEN */
1464                 cm_node->accept_pend = 1;
1465                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1466                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1467                                 cm_node->listener->backlog) {
1468                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1469                                 "pressure \n");
1470                         cm_backlog_drops++;
1471                         passive_open_err(cm_node, skb, 0);
1472                         break;
1473                 }
1474                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1475                         1);
1476                 if (ret) {
1477                         passive_open_err(cm_node, skb, 0);
1478                         /* drop pkt */
1479                         break;
1480                 }
1481                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1482                 BUG_ON(cm_node->send_entry);
1483                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1484                 send_syn(cm_node, 1, skb);
1485                 break;
1486         case NES_CM_STATE_CLOSED:
1487                 cleanup_retrans_entry(cm_node);
1488                 send_reset(cm_node, skb);
1489                 break;
1490         case NES_CM_STATE_TSA:
1491         case NES_CM_STATE_ESTABLISHED:
1492         case NES_CM_STATE_FIN_WAIT1:
1493         case NES_CM_STATE_FIN_WAIT2:
1494         case NES_CM_STATE_MPAREQ_RCVD:
1495         case NES_CM_STATE_LAST_ACK:
1496         case NES_CM_STATE_CLOSING:
1497         case NES_CM_STATE_UNKNOWN:
1498         default:
1499                 drop_packet(skb);
1500                 break;
1501         }
1502 }
1503
1504 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1505         struct tcphdr *tcph)
1506 {
1507
1508         int ret;
1509         u32 inc_sequence;
1510         int optionsize;
1511
1512         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1513         skb_trim(skb, 0);
1514         inc_sequence = ntohl(tcph->seq);
1515         switch (cm_node->state) {
1516         case NES_CM_STATE_SYN_SENT:
1517                 /* active open */
1518                 if (check_syn(cm_node, tcph, skb))
1519                         return;
1520                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1521                 /* setup options */
1522                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1523                 if (ret) {
1524                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1525                                 cm_node);
1526                         break;
1527                 }
1528                 cleanup_retrans_entry(cm_node);
1529                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1530                 send_mpa_request(cm_node, skb);
1531                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1532                 break;
1533         case NES_CM_STATE_MPAREQ_RCVD:
1534                 /* passive open, so should not be here */
1535                 passive_open_err(cm_node, skb, 1);
1536                 break;
1537         case NES_CM_STATE_LISTENING:
1538         case NES_CM_STATE_CLOSED:
1539                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1540                 cleanup_retrans_entry(cm_node);
1541                 send_reset(cm_node, skb);
1542                 break;
1543         case NES_CM_STATE_ESTABLISHED:
1544         case NES_CM_STATE_FIN_WAIT1:
1545         case NES_CM_STATE_FIN_WAIT2:
1546         case NES_CM_STATE_LAST_ACK:
1547         case NES_CM_STATE_TSA:
1548         case NES_CM_STATE_CLOSING:
1549         case NES_CM_STATE_UNKNOWN:
1550         case NES_CM_STATE_MPAREQ_SENT:
1551         default:
1552                 drop_packet(skb);
1553                 break;
1554         }
1555 }
1556
1557 static void handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1558         struct tcphdr *tcph)
1559 {
1560         int datasize = 0;
1561         u32 inc_sequence;
1562         u32 rem_seq_ack;
1563         u32 rem_seq;
1564         int ret;
1565         int optionsize;
1566         u32 temp_seq = cm_node->tcp_cntxt.loc_seq_num;
1567
1568         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1569         cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1570
1571         if (check_seq(cm_node, tcph, skb))
1572                 return;
1573
1574         skb_pull(skb, tcph->doff << 2);
1575         inc_sequence = ntohl(tcph->seq);
1576         rem_seq = ntohl(tcph->seq);
1577         rem_seq_ack =  ntohl(tcph->ack_seq);
1578         datasize = skb->len;
1579
1580         switch (cm_node->state) {
1581         case NES_CM_STATE_SYN_RCVD:
1582                 /* Passive OPEN */
1583                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1584                 if (ret)
1585                         break;
1586                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1587                 cm_node->tcp_cntxt.loc_seq_num = temp_seq;
1588                 if (cm_node->tcp_cntxt.rem_ack_num !=
1589                     cm_node->tcp_cntxt.loc_seq_num) {
1590                         nes_debug(NES_DBG_CM, "rem_ack_num != loc_seq_num\n");
1591                         cleanup_retrans_entry(cm_node);
1592                         send_reset(cm_node, skb);
1593                         return;
1594                 }
1595                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1596                 if (datasize) {
1597                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1598                         cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1599                         handle_rcv_mpa(cm_node, skb, NES_CM_EVENT_MPA_REQ);
1600                  } else { /* rcvd ACK only */
1601                         dev_kfree_skb_any(skb);
1602                         cleanup_retrans_entry(cm_node);
1603                  }
1604                 break;
1605         case NES_CM_STATE_ESTABLISHED:
1606                 /* Passive OPEN */
1607                 /* We expect mpa frame to be received only */
1608                 if (datasize) {
1609                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1610                         cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1611                         handle_rcv_mpa(cm_node, skb,
1612                                 NES_CM_EVENT_MPA_REQ);
1613                 } else
1614                         drop_packet(skb);
1615                 break;
1616         case NES_CM_STATE_MPAREQ_SENT:
1617                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1618                 if (datasize) {
1619                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1620                         handle_rcv_mpa(cm_node, skb, NES_CM_EVENT_CONNECTED);
1621                 } else { /* Could be just an ack pkt.. */
1622                         cleanup_retrans_entry(cm_node);
1623                         dev_kfree_skb_any(skb);
1624                 }
1625                 break;
1626         case NES_CM_STATE_LISTENING:
1627         case NES_CM_STATE_CLOSED:
1628                 cleanup_retrans_entry(cm_node);
1629                 send_reset(cm_node, skb);
1630                 break;
1631         case NES_CM_STATE_FIN_WAIT1:
1632         case NES_CM_STATE_SYN_SENT:
1633         case NES_CM_STATE_FIN_WAIT2:
1634         case NES_CM_STATE_TSA:
1635         case NES_CM_STATE_MPAREQ_RCVD:
1636         case NES_CM_STATE_LAST_ACK:
1637         case NES_CM_STATE_CLOSING:
1638         case NES_CM_STATE_UNKNOWN:
1639         default:
1640                 drop_packet(skb);
1641                 break;
1642         }
1643 }
1644
1645
1646
1647 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1648         struct sk_buff *skb, int optionsize, int passive)
1649 {
1650         u8 *optionsloc = (u8 *)&tcph[1];
1651         if (optionsize) {
1652                 if (process_options(cm_node, optionsloc, optionsize,
1653                         (u32)tcph->syn)) {
1654                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
1655                                 __func__, cm_node);
1656                         if (passive)
1657                                 passive_open_err(cm_node, skb, 1);
1658                         else
1659                                 active_open_err(cm_node, skb, 1);
1660                         return 1;
1661                 }
1662         }
1663
1664         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1665                         cm_node->tcp_cntxt.snd_wscale;
1666
1667         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1668                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1669         return 0;
1670 }
1671
1672 /*
1673  * active_open_err() will send reset() if flag set..
1674  * It will also send ABORT event.
1675  */
1676
1677 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1678         int reset)
1679 {
1680         cleanup_retrans_entry(cm_node);
1681         if (reset) {
1682                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
1683                                 "state=%d\n", cm_node, cm_node->state);
1684                 add_ref_cm_node(cm_node);
1685                 send_reset(cm_node, skb);
1686         } else
1687                 dev_kfree_skb_any(skb);
1688
1689         cm_node->state = NES_CM_STATE_CLOSED;
1690         create_event(cm_node, NES_CM_EVENT_ABORTED);
1691 }
1692
1693 /*
1694  * passive_open_err() will either do a reset() or will free up the skb and
1695  * remove the cm_node.
1696  */
1697
1698 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1699         int reset)
1700 {
1701         cleanup_retrans_entry(cm_node);
1702         cm_node->state = NES_CM_STATE_CLOSED;
1703         if (reset) {
1704                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
1705                         "cm_node=%p state =%d\n", cm_node, cm_node->state);
1706                 send_reset(cm_node, skb);
1707         } else {
1708                 dev_kfree_skb_any(skb);
1709                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1710         }
1711 }
1712
1713 /*
1714  * free_retrans_entry() routines assumes that the retrans_list_lock has
1715  * been acquired before calling.
1716  */
1717 static void free_retrans_entry(struct nes_cm_node *cm_node)
1718 {
1719         struct nes_timer_entry *send_entry;
1720         send_entry = cm_node->send_entry;
1721         if (send_entry) {
1722                 cm_node->send_entry = NULL;
1723                 dev_kfree_skb_any(send_entry->skb);
1724                 kfree(send_entry);
1725                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1726         }
1727 }
1728
1729 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
1730 {
1731         unsigned long flags;
1732
1733         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1734         free_retrans_entry(cm_node);
1735         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1736 }
1737
1738 /**
1739  * process_packet
1740  * Returns skb if to be freed, else it will return NULL if already used..
1741  */
1742 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1743         struct nes_cm_core *cm_core)
1744 {
1745         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
1746         struct tcphdr *tcph = tcp_hdr(skb);
1747         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1748
1749         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1750                 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1751                 tcph->ack, tcph->rst, tcph->fin);
1752
1753         if (tcph->rst)
1754                 pkt_type = NES_PKT_TYPE_RST;
1755         else if (tcph->syn) {
1756                 pkt_type = NES_PKT_TYPE_SYN;
1757                 if (tcph->ack)
1758                         pkt_type = NES_PKT_TYPE_SYNACK;
1759         } else if (tcph->fin)
1760                 pkt_type = NES_PKT_TYPE_FIN;
1761         else if (tcph->ack)
1762                 pkt_type = NES_PKT_TYPE_ACK;
1763
1764         switch (pkt_type) {
1765         case NES_PKT_TYPE_SYN:
1766                 handle_syn_pkt(cm_node, skb, tcph);
1767                 break;
1768         case NES_PKT_TYPE_SYNACK:
1769                 handle_synack_pkt(cm_node, skb, tcph);
1770                 break;
1771         case NES_PKT_TYPE_ACK:
1772                 handle_ack_pkt(cm_node, skb, tcph);
1773                 break;
1774         case NES_PKT_TYPE_RST:
1775                 handle_rst_pkt(cm_node, skb, tcph);
1776                 break;
1777         case NES_PKT_TYPE_FIN:
1778                 handle_fin_pkt(cm_node, skb, tcph);
1779                 break;
1780         default:
1781                 drop_packet(skb);
1782                 break;
1783         }
1784 }
1785
1786 /**
1787  * mini_cm_listen - create a listen node with params
1788  */
1789 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1790         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1791 {
1792         struct nes_cm_listener *listener;
1793         unsigned long flags;
1794
1795         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1796                 cm_info->loc_addr, cm_info->loc_port);
1797
1798         /* cannot have multiple matching listeners */
1799         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1800                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1801         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1802                 /* find automatically incs ref count ??? */
1803                 atomic_dec(&listener->ref_count);
1804                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1805                 return NULL;
1806         }
1807
1808         if (!listener) {
1809                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1810                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1811                 if (!listener) {
1812                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1813                         return NULL;
1814                 }
1815
1816                 listener->loc_addr = htonl(cm_info->loc_addr);
1817                 listener->loc_port = htons(cm_info->loc_port);
1818                 listener->reused_node = 0;
1819
1820                 atomic_set(&listener->ref_count, 1);
1821         }
1822         /* pasive case */
1823         /* find already inc'ed the ref count */
1824         else {
1825                 listener->reused_node = 1;
1826         }
1827
1828         listener->cm_id = cm_info->cm_id;
1829         atomic_set(&listener->pend_accepts_cnt, 0);
1830         listener->cm_core = cm_core;
1831         listener->nesvnic = nesvnic;
1832         atomic_inc(&cm_core->node_cnt);
1833
1834         listener->conn_type = cm_info->conn_type;
1835         listener->backlog = cm_info->backlog;
1836         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1837
1838         if (!listener->reused_node) {
1839                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1840                 list_add(&listener->list, &cm_core->listen_list.list);
1841                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1842                 atomic_inc(&cm_core->listen_node_cnt);
1843         }
1844
1845         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
1846                         " listener = %p, backlog = %d, cm_id = %p.\n",
1847                         cm_info->loc_addr, cm_info->loc_port,
1848                         listener, listener->backlog, listener->cm_id);
1849
1850         return listener;
1851 }
1852
1853
1854 /**
1855  * mini_cm_connect - make a connection node with params
1856  */
1857 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1858         struct nes_vnic *nesvnic, u16 private_data_len,
1859         void *private_data, struct nes_cm_info *cm_info)
1860 {
1861         int ret = 0;
1862         struct nes_cm_node *cm_node;
1863         struct nes_cm_listener *loopbackremotelistener;
1864         struct nes_cm_node *loopbackremotenode;
1865         struct nes_cm_info loopback_cm_info;
1866         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
1867         struct ietf_mpa_frame *mpa_frame = NULL;
1868
1869         /* create a CM connection node */
1870         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
1871         if (!cm_node)
1872                 return NULL;
1873         mpa_frame = &cm_node->mpa_frame;
1874         strcpy(mpa_frame->key, IEFT_MPA_KEY_REQ);
1875         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
1876         mpa_frame->rev =  IETF_MPA_VERSION;
1877         mpa_frame->priv_data_len = htons(private_data_len);
1878
1879         /* set our node side to client (active) side */
1880         cm_node->tcp_cntxt.client = 1;
1881         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1882
1883         if (cm_info->loc_addr == cm_info->rem_addr) {
1884                 loopbackremotelistener = find_listener(cm_core,
1885                                 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
1886                                 NES_CM_LISTENER_ACTIVE_STATE);
1887                 if (loopbackremotelistener == NULL) {
1888                         create_event(cm_node, NES_CM_EVENT_ABORTED);
1889                 } else {
1890                         atomic_inc(&cm_loopbacks);
1891                         loopback_cm_info = *cm_info;
1892                         loopback_cm_info.loc_port = cm_info->rem_port;
1893                         loopback_cm_info.rem_port = cm_info->loc_port;
1894                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
1895                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
1896                                 &loopback_cm_info, loopbackremotelistener);
1897                         loopbackremotenode->loopbackpartner = cm_node;
1898                         loopbackremotenode->tcp_cntxt.rcv_wscale =
1899                                 NES_CM_DEFAULT_RCV_WND_SCALE;
1900                         cm_node->loopbackpartner = loopbackremotenode;
1901                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
1902                                 private_data_len);
1903                         loopbackremotenode->mpa_frame_size = private_data_len;
1904
1905                         /* we are done handling this state. */
1906                         /* set node to a TSA state */
1907                         cm_node->state = NES_CM_STATE_TSA;
1908                         cm_node->tcp_cntxt.rcv_nxt =
1909                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
1910                         loopbackremotenode->tcp_cntxt.rcv_nxt =
1911                                 cm_node->tcp_cntxt.loc_seq_num;
1912                         cm_node->tcp_cntxt.max_snd_wnd =
1913                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
1914                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
1915                                 cm_node->tcp_cntxt.rcv_wnd;
1916                         cm_node->tcp_cntxt.snd_wnd =
1917                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
1918                         loopbackremotenode->tcp_cntxt.snd_wnd =
1919                                 cm_node->tcp_cntxt.rcv_wnd;
1920                         cm_node->tcp_cntxt.snd_wscale =
1921                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
1922                         loopbackremotenode->tcp_cntxt.snd_wscale =
1923                                 cm_node->tcp_cntxt.rcv_wscale;
1924
1925                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
1926                 }
1927                 return cm_node;
1928         }
1929
1930         /* set our node side to client (active) side */
1931         cm_node->tcp_cntxt.client = 1;
1932         /* init our MPA frame ptr */
1933         memcpy(mpa_frame->priv_data, private_data, private_data_len);
1934
1935         cm_node->mpa_frame_size = mpa_frame_size;
1936
1937         /* send a syn and goto syn sent state */
1938         cm_node->state = NES_CM_STATE_SYN_SENT;
1939         ret = send_syn(cm_node, 0, NULL);
1940
1941         if (ret) {
1942                 /* error in sending the syn free up the cm_node struct */
1943                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
1944                         "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
1945                         cm_node->rem_addr, cm_node->rem_port, cm_node,
1946                         cm_node->cm_id);
1947                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1948                 cm_node = NULL;
1949         }
1950
1951         if (cm_node)
1952                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
1953                         "port=0x%04x, cm_node=%p, cm_id = %p.\n",
1954                         cm_node->rem_addr, cm_node->rem_port, cm_node,
1955                         cm_node->cm_id);
1956
1957         return cm_node;
1958 }
1959
1960
1961 /**
1962  * mini_cm_accept - accept a connection
1963  * This function is never called
1964  */
1965 static int mini_cm_accept(struct nes_cm_core *cm_core,
1966         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
1967 {
1968         return 0;
1969 }
1970
1971
1972 /**
1973  * mini_cm_reject - reject and teardown a connection
1974  */
1975 static int mini_cm_reject(struct nes_cm_core *cm_core,
1976         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
1977 {
1978         int ret = 0;
1979         int passive_state;
1980
1981         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
1982                 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
1983
1984         if (cm_node->tcp_cntxt.client)
1985                 return ret;
1986         cleanup_retrans_entry(cm_node);
1987
1988         passive_state = atomic_add_return(1, &cm_node->passive_state);
1989         cm_node->state = NES_CM_STATE_CLOSED;
1990         if (passive_state == NES_SEND_RESET_EVENT)
1991                 rem_ref_cm_node(cm_core, cm_node);
1992         else
1993                 ret = send_reset(cm_node, NULL);
1994         return ret;
1995 }
1996
1997
1998 /**
1999  * mini_cm_close
2000  */
2001 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2002 {
2003         int ret = 0;
2004
2005         if (!cm_core || !cm_node)
2006                 return -EINVAL;
2007
2008         switch (cm_node->state) {
2009         case NES_CM_STATE_SYN_RCVD:
2010         case NES_CM_STATE_SYN_SENT:
2011         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2012         case NES_CM_STATE_ESTABLISHED:
2013         case NES_CM_STATE_ACCEPTING:
2014         case NES_CM_STATE_MPAREQ_SENT:
2015         case NES_CM_STATE_MPAREQ_RCVD:
2016                 cleanup_retrans_entry(cm_node);
2017                 send_reset(cm_node, NULL);
2018                 break;
2019         case NES_CM_STATE_CLOSE_WAIT:
2020                 cm_node->state = NES_CM_STATE_LAST_ACK;
2021                 send_fin(cm_node, NULL);
2022                 break;
2023         case NES_CM_STATE_FIN_WAIT1:
2024         case NES_CM_STATE_FIN_WAIT2:
2025         case NES_CM_STATE_LAST_ACK:
2026         case NES_CM_STATE_TIME_WAIT:
2027         case NES_CM_STATE_CLOSING:
2028                 ret = -1;
2029                 break;
2030         case NES_CM_STATE_LISTENING:
2031         case NES_CM_STATE_UNKNOWN:
2032         case NES_CM_STATE_INITED:
2033         case NES_CM_STATE_CLOSED:
2034                 ret = rem_ref_cm_node(cm_core, cm_node);
2035                 break;
2036         case NES_CM_STATE_TSA:
2037                 if (cm_node->send_entry)
2038                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2039                                 "send_entry=%p\n", cm_node->send_entry);
2040                 ret = rem_ref_cm_node(cm_core, cm_node);
2041                 break;
2042         }
2043         return ret;
2044 }
2045
2046
2047 /**
2048  * recv_pkt - recv an ETHERNET packet, and process it through CM
2049  * node state machine
2050  */
2051 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2052         struct nes_vnic *nesvnic, struct sk_buff *skb)
2053 {
2054         struct nes_cm_node *cm_node = NULL;
2055         struct nes_cm_listener *listener = NULL;
2056         struct iphdr *iph;
2057         struct tcphdr *tcph;
2058         struct nes_cm_info nfo;
2059         int skb_handled = 1;
2060         __be32 tmp_daddr, tmp_saddr;
2061
2062         if (!skb)
2063                 return 0;
2064         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2065                 return 0;
2066         }
2067
2068         iph = (struct iphdr *)skb->data;
2069         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2070
2071         nfo.loc_addr = ntohl(iph->daddr);
2072         nfo.loc_port = ntohs(tcph->dest);
2073         nfo.rem_addr = ntohl(iph->saddr);
2074         nfo.rem_port = ntohs(tcph->source);
2075
2076         tmp_daddr = cpu_to_be32(iph->daddr);
2077         tmp_saddr = cpu_to_be32(iph->saddr);
2078
2079         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2080                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2081
2082         do {
2083                 cm_node = find_node(cm_core,
2084                         nfo.rem_port, nfo.rem_addr,
2085                         nfo.loc_port, nfo.loc_addr);
2086
2087                 if (!cm_node) {
2088                         /* Only type of packet accepted are for */
2089                         /* the PASSIVE open (syn only) */
2090                         if ((!tcph->syn) || (tcph->ack)) {
2091                                 skb_handled = 0;
2092                                 break;
2093                         }
2094                         listener = find_listener(cm_core, nfo.loc_addr,
2095                                 nfo.loc_port,
2096                                 NES_CM_LISTENER_ACTIVE_STATE);
2097                         if (!listener) {
2098                                 nfo.cm_id = NULL;
2099                                 nfo.conn_type = 0;
2100                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2101                                 skb_handled = 0;
2102                                 break;
2103                         }
2104                         nfo.cm_id = listener->cm_id;
2105                         nfo.conn_type = listener->conn_type;
2106                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2107                                 listener);
2108                         if (!cm_node) {
2109                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2110                                         "node\n");
2111                                 cm_packets_dropped++;
2112                                 atomic_dec(&listener->ref_count);
2113                                 dev_kfree_skb_any(skb);
2114                                 break;
2115                         }
2116                         if (!tcph->rst && !tcph->fin) {
2117                                 cm_node->state = NES_CM_STATE_LISTENING;
2118                         } else {
2119                                 cm_packets_dropped++;
2120                                 rem_ref_cm_node(cm_core, cm_node);
2121                                 dev_kfree_skb_any(skb);
2122                                 break;
2123                         }
2124                         add_ref_cm_node(cm_node);
2125                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2126                         rem_ref_cm_node(cm_core, cm_node);
2127                         atomic_inc(&cm_accel_dropped_pkts);
2128                         dev_kfree_skb_any(skb);
2129                         break;
2130                 }
2131                 skb_reset_network_header(skb);
2132                 skb_set_transport_header(skb, sizeof(*tcph));
2133                 skb->len = ntohs(iph->tot_len);
2134                 process_packet(cm_node, skb, cm_core);
2135                 rem_ref_cm_node(cm_core, cm_node);
2136         } while (0);
2137         return skb_handled;
2138 }
2139
2140
2141 /**
2142  * nes_cm_alloc_core - allocate a top level instance of a cm core
2143  */
2144 static struct nes_cm_core *nes_cm_alloc_core(void)
2145 {
2146         struct nes_cm_core *cm_core;
2147
2148         /* setup the CM core */
2149         /* alloc top level core control structure */
2150         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2151         if (!cm_core)
2152                 return NULL;
2153
2154         INIT_LIST_HEAD(&cm_core->connected_nodes);
2155         init_timer(&cm_core->tcp_timer);
2156         cm_core->tcp_timer.function = nes_cm_timer_tick;
2157
2158         cm_core->mtu   = NES_CM_DEFAULT_MTU;
2159         cm_core->state = NES_CM_STATE_INITED;
2160         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2161
2162         atomic_set(&cm_core->events_posted, 0);
2163
2164         cm_core->api = &nes_cm_api;
2165
2166         spin_lock_init(&cm_core->ht_lock);
2167         spin_lock_init(&cm_core->listen_list_lock);
2168
2169         INIT_LIST_HEAD(&cm_core->listen_list.list);
2170
2171         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2172
2173         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2174         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2175         cm_core->post_event = nes_cm_post_event;
2176         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2177         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2178
2179         print_core(cm_core);
2180         return cm_core;
2181 }
2182
2183
2184 /**
2185  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2186  */
2187 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2188 {
2189         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2190
2191         if (!cm_core)
2192                 return -EINVAL;
2193
2194         barrier();
2195
2196         if (timer_pending(&cm_core->tcp_timer)) {
2197                 del_timer(&cm_core->tcp_timer);
2198         }
2199
2200         destroy_workqueue(cm_core->event_wq);
2201         destroy_workqueue(cm_core->disconn_wq);
2202         nes_debug(NES_DBG_CM, "\n");
2203         kfree(cm_core);
2204
2205         return 0;
2206 }
2207
2208
2209 /**
2210  * mini_cm_get
2211  */
2212 static int mini_cm_get(struct nes_cm_core *cm_core)
2213 {
2214         return cm_core->state;
2215 }
2216
2217
2218 /**
2219  * mini_cm_set
2220  */
2221 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2222 {
2223         int ret = 0;
2224
2225         switch (type) {
2226                 case NES_CM_SET_PKT_SIZE:
2227                         cm_core->mtu = value;
2228                         break;
2229                 case NES_CM_SET_FREE_PKT_Q_SIZE:
2230                         cm_core->free_tx_pkt_max = value;
2231                         break;
2232                 default:
2233                         /* unknown set option */
2234                         ret = -EINVAL;
2235         }
2236
2237         return ret;
2238 }
2239
2240
2241 /**
2242  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2243  * successfully exchanged when this is called
2244  */
2245 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2246 {
2247         int ret = 0;
2248
2249         if (!nesqp)
2250                 return -EINVAL;
2251
2252         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2253                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2254                         NES_QPCONTEXT_MISC_DROS);
2255
2256         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2257                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2258
2259         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2260
2261         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2262
2263         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2264                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2265
2266         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2267                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2268                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2269
2270         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2271                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2272                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2273
2274         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2275         nesqp->nesqp_context->ts_recent = 0;
2276         nesqp->nesqp_context->ts_age = 0;
2277         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2278         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2279         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2280         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2281                         cm_node->tcp_cntxt.rcv_wscale);
2282         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2283         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2284         nesqp->nesqp_context->srtt = 0;
2285         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2286         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2287         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2288         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2289         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2290         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2291
2292         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2293                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2294                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2295                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2296                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2297                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2298                         le32_to_cpu(nesqp->nesqp_context->misc));
2299         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2300         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2301         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2302
2303         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2304         cm_node->state = NES_CM_STATE_TSA;
2305
2306         return ret;
2307 }
2308
2309
2310 /**
2311  * nes_cm_disconn
2312  */
2313 int nes_cm_disconn(struct nes_qp *nesqp)
2314 {
2315         unsigned long flags;
2316
2317         spin_lock_irqsave(&nesqp->lock, flags);
2318         if (nesqp->disconn_pending == 0) {
2319                 nesqp->disconn_pending++;
2320                 spin_unlock_irqrestore(&nesqp->lock, flags);
2321                 /* init our disconnect work element, to */
2322                 INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);
2323
2324                 queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
2325         } else
2326                 spin_unlock_irqrestore(&nesqp->lock, flags);
2327
2328         return 0;
2329 }
2330
2331
2332 /**
2333  * nes_disconnect_worker
2334  */
2335 static void nes_disconnect_worker(struct work_struct *work)
2336 {
2337         struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);
2338
2339         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2340                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2341         nes_cm_disconn_true(nesqp);
2342 }
2343
2344
2345 /**
2346  * nes_cm_disconn_true
2347  */
2348 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2349 {
2350         unsigned long flags;
2351         int ret = 0;
2352         struct iw_cm_id *cm_id;
2353         struct iw_cm_event cm_event;
2354         struct nes_vnic *nesvnic;
2355         u16 last_ae;
2356         u8 original_hw_tcp_state;
2357         u8 original_ibqp_state;
2358         u8 issued_disconnect_reset = 0;
2359
2360         if (!nesqp) {
2361                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2362                 return -1;
2363         }
2364
2365         spin_lock_irqsave(&nesqp->lock, flags);
2366         cm_id = nesqp->cm_id;
2367         /* make sure we havent already closed this connection */
2368         if (!cm_id) {
2369                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2370                                 nesqp->hwqp.qp_id);
2371                 spin_unlock_irqrestore(&nesqp->lock, flags);
2372                 return -1;
2373         }
2374
2375         nesvnic = to_nesvnic(nesqp->ibqp.device);
2376         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2377
2378         original_hw_tcp_state = nesqp->hw_tcp_state;
2379         original_ibqp_state   = nesqp->ibqp_state;
2380         last_ae = nesqp->last_aeq;
2381
2382
2383         nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);
2384
2385         if ((nesqp->cm_id) && (cm_id->event_handler)) {
2386                 if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2387                                 ((original_ibqp_state == IB_QPS_RTS) &&
2388                                 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2389                         atomic_inc(&cm_disconnects);
2390                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2391                         if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
2392                                 cm_event.status = IW_CM_EVENT_STATUS_RESET;
2393                                 nes_debug(NES_DBG_CM, "Generating a CM "
2394                                         "Disconnect Event (status reset) for "
2395                                         "QP%u, cm_id = %p. \n",
2396                                         nesqp->hwqp.qp_id, cm_id);
2397                         } else
2398                                 cm_event.status = IW_CM_EVENT_STATUS_OK;
2399
2400                         cm_event.local_addr = cm_id->local_addr;
2401                         cm_event.remote_addr = cm_id->remote_addr;
2402                         cm_event.private_data = NULL;
2403                         cm_event.private_data_len = 0;
2404
2405                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2406                                 " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2407                                 "cm_id = %p, refcount = %u.\n",
2408                                 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2409                                 nesqp->hwqp.sq_tail, cm_id,
2410                                 atomic_read(&nesqp->refcount));
2411
2412                         spin_unlock_irqrestore(&nesqp->lock, flags);
2413                         ret = cm_id->event_handler(cm_id, &cm_event);
2414                         if (ret)
2415                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2416                                         "returned, ret=%d\n", ret);
2417                         spin_lock_irqsave(&nesqp->lock, flags);
2418                 }
2419
2420                 nesqp->disconn_pending = 0;
2421                 /* There might have been another AE while the lock was released */
2422                 original_hw_tcp_state = nesqp->hw_tcp_state;
2423                 original_ibqp_state   = nesqp->ibqp_state;
2424                 last_ae = nesqp->last_aeq;
2425
2426                 if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
2427                                 ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2428                                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2429                                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2430                                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2431                         atomic_inc(&cm_closes);
2432                         nesqp->cm_id = NULL;
2433                         nesqp->in_disconnect = 0;
2434                         spin_unlock_irqrestore(&nesqp->lock, flags);
2435                         nes_disconnect(nesqp, 1);
2436
2437                         cm_id->provider_data = nesqp;
2438                         /* Send up the close complete event */
2439                         cm_event.event = IW_CM_EVENT_CLOSE;
2440                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2441                         cm_event.provider_data = cm_id->provider_data;
2442                         cm_event.local_addr = cm_id->local_addr;
2443                         cm_event.remote_addr = cm_id->remote_addr;
2444                         cm_event.private_data = NULL;
2445                         cm_event.private_data_len = 0;
2446
2447                         ret = cm_id->event_handler(cm_id, &cm_event);
2448                         if (ret) {
2449                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2450                         }
2451
2452                         cm_id->rem_ref(cm_id);
2453
2454                         spin_lock_irqsave(&nesqp->lock, flags);
2455                         if (nesqp->flush_issued == 0) {
2456                                 nesqp->flush_issued = 1;
2457                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2458                                 flush_wqes(nesvnic->nesdev, nesqp,
2459                                         NES_CQP_FLUSH_RQ, 1);
2460                         } else
2461                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2462                 } else {
2463                         cm_id = nesqp->cm_id;
2464                         spin_unlock_irqrestore(&nesqp->lock, flags);
2465                         /* check to see if the inbound reset beat the outbound reset */
2466                         if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
2467                                 nes_debug(NES_DBG_CM, "QP%u: Decing refcount "
2468                                         "due to inbound reset beating the "
2469                                         "outbound reset.\n", nesqp->hwqp.qp_id);
2470                         }
2471                 }
2472         } else {
2473                 nesqp->disconn_pending = 0;
2474                 spin_unlock_irqrestore(&nesqp->lock, flags);
2475         }
2476
2477         return 0;
2478 }
2479
2480
2481 /**
2482  * nes_disconnect
2483  */
2484 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2485 {
2486         int ret = 0;
2487         struct nes_vnic *nesvnic;
2488         struct nes_device *nesdev;
2489
2490         nesvnic = to_nesvnic(nesqp->ibqp.device);
2491         if (!nesvnic)
2492                 return -EINVAL;
2493
2494         nesdev = nesvnic->nesdev;
2495
2496         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2497                         atomic_read(&nesvnic->netdev->refcnt));
2498
2499         if (nesqp->active_conn) {
2500
2501                 /* indicate this connection is NOT active */
2502                 nesqp->active_conn = 0;
2503         } else {
2504                 /* Need to free the Last Streaming Mode Message */
2505                 if (nesqp->ietf_frame) {
2506                         pci_free_consistent(nesdev->pcidev,
2507                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2508                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2509                 }
2510         }
2511
2512         /* close the CM node down if it is still active */
2513         if (nesqp->cm_node) {
2514                 nes_debug(NES_DBG_CM, "Call close API\n");
2515
2516                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2517         }
2518
2519         return ret;
2520 }
2521
2522
2523 /**
2524  * nes_accept
2525  */
2526 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2527 {
2528         u64 u64temp;
2529         struct ib_qp *ibqp;
2530         struct nes_qp *nesqp;
2531         struct nes_vnic *nesvnic;
2532         struct nes_device *nesdev;
2533         struct nes_cm_node *cm_node;
2534         struct nes_adapter *adapter;
2535         struct ib_qp_attr attr;
2536         struct iw_cm_event cm_event;
2537         struct nes_hw_qp_wqe *wqe;
2538         struct nes_v4_quad nes_quad;
2539         u32 crc_value;
2540         int ret;
2541         int passive_state;
2542
2543         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2544         if (!ibqp)
2545                 return -EINVAL;
2546
2547         /* get all our handles */
2548         nesqp = to_nesqp(ibqp);
2549         nesvnic = to_nesvnic(nesqp->ibqp.device);
2550         nesdev = nesvnic->nesdev;
2551         adapter = nesdev->nesadapter;
2552
2553         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2554         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2555                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2556                 nesvnic->netdev->name);
2557
2558         /* associate the node with the QP */
2559         nesqp->cm_node = (void *)cm_node;
2560         cm_node->nesqp = nesqp;
2561         nes_add_ref(&nesqp->ibqp);
2562
2563         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
2564                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2565         atomic_inc(&cm_accepts);
2566
2567         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2568                         atomic_read(&nesvnic->netdev->refcnt));
2569
2570         /* allocate the ietf frame and space for private data */
2571         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2572                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2573                 &nesqp->ietf_frame_pbase);
2574
2575         if (!nesqp->ietf_frame) {
2576                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
2577                         "data\n");
2578                 return -ENOMEM;
2579         }
2580
2581
2582         /* setup the MPA frame */
2583         nesqp->private_data_len = conn_param->private_data_len;
2584         memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2585
2586         memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2587                         conn_param->private_data_len);
2588
2589         nesqp->ietf_frame->priv_data_len =
2590                 cpu_to_be16(conn_param->private_data_len);
2591         nesqp->ietf_frame->rev = mpa_version;
2592         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2593
2594         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2595         wqe = &nesqp->hwqp.sq_vbase[0];
2596
2597         if (cm_id->remote_addr.sin_addr.s_addr !=
2598                         cm_id->local_addr.sin_addr.s_addr) {
2599                 u64temp = (unsigned long)nesqp;
2600                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2601                 set_wqe_64bit_value(wqe->wqe_words,
2602                         NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2603                         u64temp);
2604                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2605                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2606                         NES_IWARP_SQ_WQE_WRPDU);
2607                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2608                         cpu_to_le32(conn_param->private_data_len +
2609                         sizeof(struct ietf_mpa_frame));
2610                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] =
2611                         cpu_to_le32((u32)nesqp->ietf_frame_pbase);
2612                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] =
2613                         cpu_to_le32((u32)((u64)nesqp->ietf_frame_pbase >> 32));
2614                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2615                         cpu_to_le32(conn_param->private_data_len +
2616                         sizeof(struct ietf_mpa_frame));
2617                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
2618
2619                 nesqp->nesqp_context->ird_ord_sizes |=
2620                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2621                         NES_QPCONTEXT_ORDIRD_WRPDU);
2622         } else {
2623                 nesqp->nesqp_context->ird_ord_sizes |=
2624                         cpu_to_le32((NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2625                         NES_QPCONTEXT_ORDIRD_WRPDU |
2626                         NES_QPCONTEXT_ORDIRD_ALSMM));
2627         }
2628         nesqp->skip_lsmm = 1;
2629
2630
2631         /* Cache the cm_id in the qp */
2632         nesqp->cm_id = cm_id;
2633         cm_node->cm_id = cm_id;
2634
2635         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2636         cm_id->provider_data = nesqp;
2637         nesqp->active_conn   = 0;
2638
2639         if (cm_node->state == NES_CM_STATE_TSA)
2640                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2641                         cm_node);
2642
2643         nes_cm_init_tsa_conn(nesqp, cm_node);
2644
2645         nesqp->nesqp_context->tcpPorts[0] =
2646                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2647         nesqp->nesqp_context->tcpPorts[1] =
2648                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2649
2650         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2651                 nesqp->nesqp_context->ip0 =
2652                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2653         else
2654                 nesqp->nesqp_context->ip0 =
2655                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2656
2657         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2658                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2659                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2660
2661         nesqp->nesqp_context->arp_index_vlan |=
2662                 cpu_to_le32(nes_arp_table(nesdev,
2663                         le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2664                         NES_ARP_RESOLVE) << 16);
2665
2666         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2667                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2668
2669         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2670
2671         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2672                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2673         nesqp->nesqp_context->ird_ord_sizes |=
2674                 cpu_to_le32((u32)conn_param->ord);
2675
2676         memset(&nes_quad, 0, sizeof(nes_quad));
2677         nes_quad.DstIpAdrIndex =
2678                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2679         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2680                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2681         else
2682                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2683         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2684         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2685
2686         /* Produce hash key */
2687         crc_value = get_crc_value(&nes_quad);
2688         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2689         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2690                 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2691
2692         nesqp->hte_index &= adapter->hte_index_mask;
2693         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2694
2695         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2696
2697         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2698                         "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2699                         "private data length=%zu.\n", nesqp->hwqp.qp_id,
2700                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2701                         ntohs(cm_id->remote_addr.sin_port),
2702                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2703                         ntohs(cm_id->local_addr.sin_port),
2704                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2705                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2706                         conn_param->private_data_len +
2707                         sizeof(struct ietf_mpa_frame));
2708
2709
2710         /* notify OF layer that accept event was successful */
2711         cm_id->add_ref(cm_id);
2712
2713         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2714         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2715         cm_event.provider_data = (void *)nesqp;
2716         cm_event.local_addr = cm_id->local_addr;
2717         cm_event.remote_addr = cm_id->remote_addr;
2718         cm_event.private_data = NULL;
2719         cm_event.private_data_len = 0;
2720         ret = cm_id->event_handler(cm_id, &cm_event);
2721         attr.qp_state = IB_QPS_RTS;
2722         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2723         if (cm_node->loopbackpartner) {
2724                 cm_node->loopbackpartner->mpa_frame_size =
2725                         nesqp->private_data_len;
2726                 /* copy entire MPA frame to our cm_node's frame */
2727                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2728                         nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2729                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2730         }
2731         if (ret)
2732                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2733                         "ret=%d\n", __func__, __LINE__, ret);
2734
2735         passive_state = atomic_add_return(1, &cm_node->passive_state);
2736         if (passive_state == NES_SEND_RESET_EVENT)
2737                 create_event(cm_node, NES_CM_EVENT_RESET);
2738         return 0;
2739 }
2740
2741
2742 /**
2743  * nes_reject
2744  */
2745 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2746 {
2747         struct nes_cm_node *cm_node;
2748         struct nes_cm_core *cm_core;
2749
2750         atomic_inc(&cm_rejects);
2751         cm_node = (struct nes_cm_node *) cm_id->provider_data;
2752         cm_core = cm_node->cm_core;
2753         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
2754
2755         strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
2756         memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
2757
2758         cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
2759         cm_node->mpa_frame.rev = mpa_version;
2760         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
2761
2762         cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
2763
2764         return 0;
2765 }
2766
2767
2768 /**
2769  * nes_connect
2770  * setup and launch cm connect node
2771  */
2772 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2773 {
2774         struct ib_qp *ibqp;
2775         struct nes_qp *nesqp;
2776         struct nes_vnic *nesvnic;
2777         struct nes_device *nesdev;
2778         struct nes_cm_node *cm_node;
2779         struct nes_cm_info cm_info;
2780
2781         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2782         if (!ibqp)
2783                 return -EINVAL;
2784         nesqp = to_nesqp(ibqp);
2785         if (!nesqp)
2786                 return -EINVAL;
2787         nesvnic = to_nesvnic(nesqp->ibqp.device);
2788         if (!nesvnic)
2789                 return -EINVAL;
2790         nesdev  = nesvnic->nesdev;
2791         if (!nesdev)
2792                 return -EINVAL;
2793
2794         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
2795                 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
2796                 ntohl(nesvnic->local_ipaddr),
2797                 ntohl(cm_id->remote_addr.sin_addr.s_addr),
2798                 ntohs(cm_id->remote_addr.sin_port),
2799                 ntohl(cm_id->local_addr.sin_addr.s_addr),
2800                 ntohs(cm_id->local_addr.sin_port));
2801
2802         atomic_inc(&cm_connects);
2803         nesqp->active_conn = 1;
2804
2805         /* cache the cm_id in the qp */
2806         nesqp->cm_id = cm_id;
2807
2808         cm_id->provider_data = nesqp;
2809
2810         nesqp->private_data_len = conn_param->private_data_len;
2811         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2812         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
2813         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
2814                 conn_param->private_data_len);
2815
2816         if (cm_id->local_addr.sin_addr.s_addr !=
2817                 cm_id->remote_addr.sin_addr.s_addr)
2818                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2819                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2820
2821         /* set up the connection params for the node */
2822         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
2823         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
2824         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
2825         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
2826         cm_info.cm_id = cm_id;
2827         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2828
2829         cm_id->add_ref(cm_id);
2830
2831         /* create a connect CM node connection */
2832         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
2833                 conn_param->private_data_len, (void *)conn_param->private_data,
2834                 &cm_info);
2835         if (!cm_node) {
2836                 if (cm_id->local_addr.sin_addr.s_addr !=
2837                                 cm_id->remote_addr.sin_addr.s_addr)
2838                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2839                                 PCI_FUNC(nesdev->pcidev->devfn),
2840                                 NES_MANAGE_APBVT_DEL);
2841
2842                 cm_id->rem_ref(cm_id);
2843                 return -ENOMEM;
2844         }
2845
2846         cm_node->apbvt_set = 1;
2847         nesqp->cm_node = cm_node;
2848         cm_node->nesqp = nesqp;
2849         nes_add_ref(&nesqp->ibqp);
2850
2851         return 0;
2852 }
2853
2854
2855 /**
2856  * nes_create_listen
2857  */
2858 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
2859 {
2860         struct nes_vnic *nesvnic;
2861         struct nes_cm_listener *cm_node;
2862         struct nes_cm_info cm_info;
2863         struct nes_adapter *adapter;
2864         int err;
2865
2866
2867         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
2868                         cm_id, ntohs(cm_id->local_addr.sin_port));
2869
2870         nesvnic = to_nesvnic(cm_id->device);
2871         if (!nesvnic)
2872                 return -EINVAL;
2873         adapter = nesvnic->nesdev->nesadapter;
2874         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
2875                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
2876
2877         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
2878                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
2879
2880         /* setup listen params in our api call struct */
2881         cm_info.loc_addr = nesvnic->local_ipaddr;
2882         cm_info.loc_port = cm_id->local_addr.sin_port;
2883         cm_info.backlog = backlog;
2884         cm_info.cm_id = cm_id;
2885
2886         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2887
2888
2889         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
2890         if (!cm_node) {
2891                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
2892                                 __func__, __LINE__);
2893                 return -ENOMEM;
2894         }
2895
2896         cm_id->provider_data = cm_node;
2897
2898         if (!cm_node->reused_node) {
2899                 err = nes_manage_apbvt(nesvnic,
2900                         ntohs(cm_id->local_addr.sin_port),
2901                         PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
2902                         NES_MANAGE_APBVT_ADD);
2903                 if (err) {
2904                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
2905                                 err);
2906                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
2907                         return err;
2908                 }
2909                 cm_listens_created++;
2910         }
2911
2912         cm_id->add_ref(cm_id);
2913         cm_id->provider_data = (void *)cm_node;
2914
2915
2916         return 0;
2917 }
2918
2919
2920 /**
2921  * nes_destroy_listen
2922  */
2923 int nes_destroy_listen(struct iw_cm_id *cm_id)
2924 {
2925         if (cm_id->provider_data)
2926                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
2927         else
2928                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
2929
2930         cm_id->rem_ref(cm_id);
2931
2932         return 0;
2933 }
2934
2935
2936 /**
2937  * nes_cm_recv
2938  */
2939 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
2940 {
2941         int rc = 0;
2942         cm_packets_received++;
2943         if ((g_cm_core) && (g_cm_core->api)) {
2944                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
2945         } else {
2946                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
2947                                 " cm is not setup properly.\n");
2948         }
2949
2950         return rc;
2951 }
2952
2953
2954 /**
2955  * nes_cm_start
2956  * Start and init a cm core module
2957  */
2958 int nes_cm_start(void)
2959 {
2960         nes_debug(NES_DBG_CM, "\n");
2961         /* create the primary CM core, pass this handle to subsequent core inits */
2962         g_cm_core = nes_cm_alloc_core();
2963         if (g_cm_core) {
2964                 return 0;
2965         } else {
2966                 return -ENOMEM;
2967         }
2968 }
2969
2970
2971 /**
2972  * nes_cm_stop
2973  * stop and dealloc all cm core instances
2974  */
2975 int nes_cm_stop(void)
2976 {
2977         g_cm_core->api->destroy_cm_core(g_cm_core);
2978         return 0;
2979 }
2980
2981
2982 /**
2983  * cm_event_connected
2984  * handle a connected event, setup QPs and HW
2985  */
2986 static void cm_event_connected(struct nes_cm_event *event)
2987 {
2988         u64 u64temp;
2989         struct nes_qp *nesqp;
2990         struct nes_vnic *nesvnic;
2991         struct nes_device *nesdev;
2992         struct nes_cm_node *cm_node;
2993         struct nes_adapter *nesadapter;
2994         struct ib_qp_attr attr;
2995         struct iw_cm_id *cm_id;
2996         struct iw_cm_event cm_event;
2997         struct nes_hw_qp_wqe *wqe;
2998         struct nes_v4_quad nes_quad;
2999         u32 crc_value;
3000         int ret;
3001
3002         /* get all our handles */
3003         cm_node = event->cm_node;
3004         cm_id = cm_node->cm_id;
3005         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3006         nesqp = (struct nes_qp *)cm_id->provider_data;
3007         nesvnic = to_nesvnic(nesqp->ibqp.device);
3008         nesdev = nesvnic->nesdev;
3009         nesadapter = nesdev->nesadapter;
3010
3011         if (nesqp->destroyed) {
3012                 return;
3013         }
3014         atomic_inc(&cm_connecteds);
3015         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3016                         " local port 0x%04X. jiffies = %lu.\n",
3017                         nesqp->hwqp.qp_id,
3018                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
3019                         ntohs(cm_id->remote_addr.sin_port),
3020                         ntohs(cm_id->local_addr.sin_port),
3021                         jiffies);
3022
3023         nes_cm_init_tsa_conn(nesqp, cm_node);
3024
3025         /* set the QP tsa context */
3026         nesqp->nesqp_context->tcpPorts[0] =
3027                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3028         nesqp->nesqp_context->tcpPorts[1] =
3029                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3030         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3031                 nesqp->nesqp_context->ip0 =
3032                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3033         else
3034                 nesqp->nesqp_context->ip0 =
3035                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3036
3037         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3038                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3039                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3040         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3041                         nes_arp_table(nesdev,
3042                         le32_to_cpu(nesqp->nesqp_context->ip0),
3043                         NULL, NES_ARP_RESOLVE) << 16);
3044         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3045                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3046         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3047         nesqp->nesqp_context->ird_ord_sizes |=
3048                         cpu_to_le32((u32)1 <<
3049                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3050
3051         /* Adjust tail for not having a LSMM */
3052         nesqp->hwqp.sq_tail = 1;
3053
3054 #if defined(NES_SEND_FIRST_WRITE)
3055         if (cm_node->send_write0) {
3056                 nes_debug(NES_DBG_CM, "Sending first write.\n");
3057                 wqe = &nesqp->hwqp.sq_vbase[0];
3058                 u64temp = (unsigned long)nesqp;
3059                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3060                 set_wqe_64bit_value(wqe->wqe_words,
3061                                 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3062                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3063                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3064                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3065                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3066                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3067                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3068                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3069
3070                 /* use the reserved spot on the WQ for the extra first WQE */
3071                 nesqp->nesqp_context->ird_ord_sizes &=
3072                         cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3073                                                 NES_QPCONTEXT_ORDIRD_WRPDU |
3074                                                 NES_QPCONTEXT_ORDIRD_ALSMM));
3075                 nesqp->skip_lsmm = 1;
3076                 nesqp->hwqp.sq_tail = 0;
3077                 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3078                                 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3079         }
3080 #endif
3081
3082         memset(&nes_quad, 0, sizeof(nes_quad));
3083
3084         nes_quad.DstIpAdrIndex =
3085                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3086         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3087                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3088         else
3089                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3090         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3091         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3092
3093         /* Produce hash key */
3094         crc_value = get_crc_value(&nes_quad);
3095         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3096         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3097                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3098
3099         nesqp->hte_index &= nesadapter->hte_index_mask;
3100         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3101
3102         nesqp->ietf_frame = &cm_node->mpa_frame;
3103         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3104         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3105
3106         /* notify OF layer we successfully created the requested connection */
3107         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3108         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
3109         cm_event.provider_data = cm_id->provider_data;
3110         cm_event.local_addr.sin_family = AF_INET;
3111         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3112         cm_event.remote_addr = cm_id->remote_addr;
3113
3114         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3115         cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3116
3117         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3118         ret = cm_id->event_handler(cm_id, &cm_event);
3119         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3120
3121         if (ret)
3122                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3123                         "ret=%d\n", __func__, __LINE__, ret);
3124         attr.qp_state = IB_QPS_RTS;
3125         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3126
3127         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3128                 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3129
3130         return;
3131 }
3132
3133
3134 /**
3135  * cm_event_connect_error
3136  */
3137 static void cm_event_connect_error(struct nes_cm_event *event)
3138 {
3139         struct nes_qp *nesqp;
3140         struct iw_cm_id *cm_id;
3141         struct iw_cm_event cm_event;
3142         /* struct nes_cm_info cm_info; */
3143         int ret;
3144
3145         if (!event->cm_node)
3146                 return;
3147
3148         cm_id = event->cm_node->cm_id;
3149         if (!cm_id) {
3150                 return;
3151         }
3152
3153         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3154         nesqp = cm_id->provider_data;
3155
3156         if (!nesqp) {
3157                 return;
3158         }
3159
3160         /* notify OF layer about this connection error event */
3161         /* cm_id->rem_ref(cm_id); */
3162         nesqp->cm_id = NULL;
3163         cm_id->provider_data = NULL;
3164         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3165         cm_event.status = IW_CM_EVENT_STATUS_REJECTED;
3166         cm_event.provider_data = cm_id->provider_data;
3167         cm_event.local_addr = cm_id->local_addr;
3168         cm_event.remote_addr = cm_id->remote_addr;
3169         cm_event.private_data = NULL;
3170         cm_event.private_data_len = 0;
3171
3172         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3173                 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3174                 cm_event.remote_addr.sin_addr.s_addr);
3175
3176         ret = cm_id->event_handler(cm_id, &cm_event);
3177         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3178         if (ret)
3179                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3180                         "ret=%d\n", __func__, __LINE__, ret);
3181         cm_id->rem_ref(cm_id);
3182
3183         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3184         return;
3185 }
3186
3187
3188 /**
3189  * cm_event_reset
3190  */
3191 static void cm_event_reset(struct nes_cm_event *event)
3192 {
3193         struct nes_qp *nesqp;
3194         struct iw_cm_id *cm_id;
3195         struct iw_cm_event cm_event;
3196         /* struct nes_cm_info cm_info; */
3197         int ret;
3198
3199         if (!event->cm_node)
3200                 return;
3201
3202         if (!event->cm_node->cm_id)
3203                 return;
3204
3205         cm_id = event->cm_node->cm_id;
3206
3207         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3208         nesqp = cm_id->provider_data;
3209
3210         nesqp->cm_id = NULL;
3211         /* cm_id->provider_data = NULL; */
3212         cm_event.event = IW_CM_EVENT_DISCONNECT;
3213         cm_event.status = IW_CM_EVENT_STATUS_RESET;
3214         cm_event.provider_data = cm_id->provider_data;
3215         cm_event.local_addr = cm_id->local_addr;
3216         cm_event.remote_addr = cm_id->remote_addr;
3217         cm_event.private_data = NULL;
3218         cm_event.private_data_len = 0;
3219
3220         ret = cm_id->event_handler(cm_id, &cm_event);
3221         cm_id->add_ref(cm_id);
3222         atomic_inc(&cm_closes);
3223         cm_event.event = IW_CM_EVENT_CLOSE;
3224         cm_event.status = IW_CM_EVENT_STATUS_OK;
3225         cm_event.provider_data = cm_id->provider_data;
3226         cm_event.local_addr = cm_id->local_addr;
3227         cm_event.remote_addr = cm_id->remote_addr;
3228         cm_event.private_data = NULL;
3229         cm_event.private_data_len = 0;
3230         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3231         ret = cm_id->event_handler(cm_id, &cm_event);
3232
3233         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3234
3235
3236         /* notify OF layer about this connection error event */
3237         cm_id->rem_ref(cm_id);
3238
3239         return;
3240 }
3241
3242
3243 /**
3244  * cm_event_mpa_req
3245  */
3246 static void cm_event_mpa_req(struct nes_cm_event *event)
3247 {
3248         struct iw_cm_id   *cm_id;
3249         struct iw_cm_event cm_event;
3250         int ret;
3251         struct nes_cm_node *cm_node;
3252
3253         cm_node = event->cm_node;
3254         if (!cm_node)
3255                 return;
3256         cm_id = cm_node->cm_id;
3257
3258         atomic_inc(&cm_connect_reqs);
3259         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3260                         cm_node, cm_id, jiffies);
3261
3262         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3263         cm_event.status = IW_CM_EVENT_STATUS_OK;
3264         cm_event.provider_data = (void *)cm_node;
3265
3266         cm_event.local_addr.sin_family = AF_INET;
3267         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3268         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3269
3270         cm_event.remote_addr.sin_family = AF_INET;
3271         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3272         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3273
3274                 cm_event.private_data                = cm_node->mpa_frame_buf;
3275                 cm_event.private_data_len            = (u8) cm_node->mpa_frame_size;
3276
3277         ret = cm_id->event_handler(cm_id, &cm_event);
3278         if (ret)
3279                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
3280                                 __func__, __LINE__, ret);
3281
3282         return;
3283 }
3284
3285
3286 static void nes_cm_event_handler(struct work_struct *);
3287
3288 /**
3289  * nes_cm_post_event
3290  * post an event to the cm event handler
3291  */
3292 static int nes_cm_post_event(struct nes_cm_event *event)
3293 {
3294         atomic_inc(&event->cm_node->cm_core->events_posted);
3295         add_ref_cm_node(event->cm_node);
3296         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3297         INIT_WORK(&event->event_work, nes_cm_event_handler);
3298         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3299                 event->cm_node, event);
3300
3301         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3302
3303         nes_debug(NES_DBG_CM, "Exit\n");
3304         return 0;
3305 }
3306
3307
3308 /**
3309  * nes_cm_event_handler
3310  * worker function to handle cm events
3311  * will free instance of nes_cm_event
3312  */
3313 static void nes_cm_event_handler(struct work_struct *work)
3314 {
3315         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3316                         event_work);
3317         struct nes_cm_core *cm_core;
3318
3319         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3320                 return;
3321
3322         cm_core = event->cm_node->cm_core;
3323         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3324                 event, event->type, atomic_read(&cm_core->events_posted));
3325
3326         switch (event->type) {
3327         case NES_CM_EVENT_MPA_REQ:
3328                 cm_event_mpa_req(event);
3329                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3330                         event->cm_node);
3331                 break;
3332         case NES_CM_EVENT_RESET:
3333                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3334                         event->cm_node);
3335                 cm_event_reset(event);
3336                 break;
3337         case NES_CM_EVENT_CONNECTED:
3338                 if ((!event->cm_node->cm_id) ||
3339                         (event->cm_node->state != NES_CM_STATE_TSA))
3340                         break;
3341                 cm_event_connected(event);
3342                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3343                 break;
3344         case NES_CM_EVENT_ABORTED:
3345                 if ((!event->cm_node->cm_id) ||
3346                         (event->cm_node->state == NES_CM_STATE_TSA))
3347                         break;
3348                 cm_event_connect_error(event);
3349                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3350                 break;
3351         case NES_CM_EVENT_DROPPED_PKT:
3352                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3353                 break;
3354         default:
3355                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3356                 break;
3357         }
3358
3359         atomic_dec(&cm_core->events_posted);
3360         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3361         rem_ref_cm_node(cm_core, event->cm_node);
3362         kfree(event);
3363
3364         return;
3365 }