drivers/infiniband/hw/nes/nes_cm.c

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