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   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 #include <net/arp.h>
  56 #include <net/neighbour.h>
  57 #include <net/route.h>
  58 #include <net/ip_fib.h>
  59
  60 #include "nes.h"
  61
  62 u32 cm_packets_sent;
  63 u32 cm_packets_bounced;
  64 u32 cm_packets_dropped;
  65 u32 cm_packets_retrans;
  66 u32 cm_packets_created;
  67 u32 cm_packets_received;
  68 u32 cm_listens_created;
  69 u32 cm_listens_destroyed;
  70 u32 cm_backlog_drops;
  71 atomic_t cm_loopbacks;
  72 atomic_t cm_nodes_created;
  73 atomic_t cm_nodes_destroyed;
  74 atomic_t cm_accel_dropped_pkts;
  75 atomic_t cm_resets_recvd;
  76
  77 static inline int mini_cm_accelerated(struct nes_cm_core *,
  78         struct nes_cm_node *);
  79 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
  80         struct nes_vnic *, struct nes_cm_info *);
  81 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
  82 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *,
  83         struct nes_vnic *, u16, void *, struct nes_cm_info *);
  84 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
  85 static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
  86         struct nes_cm_node *);
  87 static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
  88         struct nes_cm_node *);
  89 static 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_resolve_neigh
1023  */
1024 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
1025 {
1026         struct rtable *rt;
1027         struct flowi fl;
1028         struct neighbour *neigh;
1029         int rc = -1;
1030         DECLARE_MAC_BUF(mac);
1031
1032         memset(&fl, 0, sizeof fl);
1033         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1034         if (ip_route_output_key(&init_net, &rt, &fl)) {
1035                 printk("%s: ip_route_output_key failed for 0x%08X\n",
1036                                 __func__, dst_ip);
1037                 return rc;
1038         }
1039
1040         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, nesvnic->netdev);
1041         if (neigh) {
1042                 if (neigh->nud_state & NUD_VALID) {
1043                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1044                                   " is %s, Gateway is 0x%08X \n", dst_ip,
1045                                   print_mac(mac, neigh->ha), ntohl(rt->rt_gateway));
1046                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1047                                              dst_ip, NES_ARP_ADD);
1048                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1049                                            NES_ARP_RESOLVE);
1050                 }
1051                 neigh_release(neigh);
1052         }
1053
1054         if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
1055                 neigh_event_send(rt->u.dst.neighbour, NULL);
1056
1057         ip_rt_put(rt);
1058         return rc;
1059 }
1060
1061
1062 /**
1063  * make_cm_node - create a new instance of a cm node
1064  */
1065 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1066                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1067                 struct nes_cm_listener *listener)
1068 {
1069         struct nes_cm_node *cm_node;
1070         struct timespec ts;
1071         int arpindex = 0;
1072         struct nes_device *nesdev;
1073         struct nes_adapter *nesadapter;
1074         DECLARE_MAC_BUF(mac);
1075
1076         /* create an hte and cm_node for this instance */
1077         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1078         if (!cm_node)
1079                 return NULL;
1080
1081         /* set our node specific transport info */
1082         cm_node->loc_addr = cm_info->loc_addr;
1083         cm_node->rem_addr = cm_info->rem_addr;
1084         cm_node->loc_port = cm_info->loc_port;
1085         cm_node->rem_port = cm_info->rem_port;
1086         cm_node->send_write0 = send_first;
1087         nes_debug(NES_DBG_CM, "Make node addresses : loc = " NIPQUAD_FMT
1088                         ":%x, rem = " NIPQUAD_FMT ":%x\n",
1089                         HIPQUAD(cm_node->loc_addr), cm_node->loc_port,
1090                         HIPQUAD(cm_node->rem_addr), cm_node->rem_port);
1091         cm_node->listener = listener;
1092         cm_node->netdev = nesvnic->netdev;
1093         cm_node->cm_id = cm_info->cm_id;
1094         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1095
1096         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1097                         cm_node->cm_id);
1098
1099         spin_lock_init(&cm_node->retrans_list_lock);
1100         INIT_LIST_HEAD(&cm_node->recv_list);
1101         spin_lock_init(&cm_node->recv_list_lock);
1102
1103         cm_node->loopbackpartner = NULL;
1104         atomic_set(&cm_node->ref_count, 1);
1105         /* associate our parent CM core */
1106         cm_node->cm_core = cm_core;
1107         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1108         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1109         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1110                         NES_CM_DEFAULT_RCV_WND_SCALE;
1111         ts = current_kernel_time();
1112         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1113         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1114                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1115         cm_node->tcp_cntxt.rcv_nxt = 0;
1116         /* get a unique session ID , add thread_id to an upcounter to handle race */
1117         atomic_inc(&cm_core->node_cnt);
1118         cm_node->conn_type = cm_info->conn_type;
1119         cm_node->apbvt_set = 0;
1120         cm_node->accept_pend = 0;
1121
1122         cm_node->nesvnic = nesvnic;
1123         /* get some device handles, for arp lookup */
1124         nesdev = nesvnic->nesdev;
1125         nesadapter = nesdev->nesadapter;
1126
1127         cm_node->loopbackpartner = NULL;
1128         /* get the mac addr for the remote node */
1129         arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1130         if (arpindex < 0) {
1131                 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr);
1132                 if (arpindex < 0) {
1133                         kfree(cm_node);
1134                         return NULL;
1135                 }
1136         }
1137
1138         /* copy the mac addr to node context */
1139         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1140         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %s\n",
1141                   print_mac(mac, cm_node->rem_mac));
1142
1143         add_hte_node(cm_core, cm_node);
1144         atomic_inc(&cm_nodes_created);
1145
1146         return cm_node;
1147 }
1148
1149
1150 /**
1151  * add_ref_cm_node - destroy an instance of a cm node
1152  */
1153 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1154 {
1155         atomic_inc(&cm_node->ref_count);
1156         return 0;
1157 }
1158
1159
1160 /**
1161  * rem_ref_cm_node - destroy an instance of a cm node
1162  */
1163 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1164         struct nes_cm_node *cm_node)
1165 {
1166         unsigned long flags, qplockflags;
1167         struct nes_timer_entry *recv_entry;
1168         struct iw_cm_id *cm_id;
1169         struct list_head *list_core, *list_node_temp;
1170         struct nes_qp *nesqp;
1171
1172         if (!cm_node)
1173                 return -EINVAL;
1174
1175         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1176         if (atomic_dec_return(&cm_node->ref_count)) {
1177                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1178                 return 0;
1179         }
1180         list_del(&cm_node->list);
1181         atomic_dec(&cm_core->ht_node_cnt);
1182         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1183
1184         /* if the node is destroyed before connection was accelerated */
1185         if (!cm_node->accelerated && cm_node->accept_pend) {
1186                 BUG_ON(!cm_node->listener);
1187                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1188                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1189         }
1190         BUG_ON(cm_node->send_entry);
1191         spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1192         list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
1193                 recv_entry = container_of(list_core, struct nes_timer_entry,
1194                                 list);
1195                 list_del(&recv_entry->list);
1196                 cm_id = cm_node->cm_id;
1197                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1198                 nesqp = (struct nes_qp *)recv_entry->skb;
1199                 spin_lock_irqsave(&nesqp->lock, qplockflags);
1200                 if (nesqp->cm_id) {
1201                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: HIT A "
1202                                 "NES_TIMER_TYPE_CLOSE with something to do!\n",
1203                                 nesqp->hwqp.qp_id, cm_id);
1204                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
1205                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
1206                         nesqp->ibqp_state = IB_QPS_ERR;
1207                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1208                         nes_cm_disconn(nesqp);
1209                 } else {
1210                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1211                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: HIT A "
1212                                 "NES_TIMER_TYPE_CLOSE with nothing to do!\n",
1213                                 nesqp->hwqp.qp_id, cm_id);
1214                 }
1215                 cm_id->rem_ref(cm_id);
1216
1217                 kfree(recv_entry);
1218                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1219         }
1220         spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1221
1222         if (cm_node->listener) {
1223                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1224         } else {
1225                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1226                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1227                                 PCI_FUNC(
1228                                 cm_node->nesvnic->nesdev->pcidev->devfn),
1229                                 NES_MANAGE_APBVT_DEL);
1230                 }
1231         }
1232
1233         atomic_dec(&cm_core->node_cnt);
1234         atomic_inc(&cm_nodes_destroyed);
1235         nesqp = cm_node->nesqp;
1236         if (nesqp) {
1237                 nesqp->cm_node = NULL;
1238                 nes_rem_ref(&nesqp->ibqp);
1239                 cm_node->nesqp = NULL;
1240         }
1241
1242         cm_node->freed = 1;
1243         kfree(cm_node);
1244         return 0;
1245 }
1246
1247 /**
1248  * process_options
1249  */
1250 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1251         u32 optionsize, u32 syn_packet)
1252 {
1253         u32 tmp;
1254         u32 offset = 0;
1255         union all_known_options *all_options;
1256         char got_mss_option = 0;
1257
1258         while (offset < optionsize) {
1259                 all_options = (union all_known_options *)(optionsloc + offset);
1260                 switch (all_options->as_base.optionnum) {
1261                 case OPTION_NUMBER_END:
1262                         offset = optionsize;
1263                         break;
1264                 case OPTION_NUMBER_NONE:
1265                         offset += 1;
1266                         continue;
1267                 case OPTION_NUMBER_MSS:
1268                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1269                                 "Size: %d\n", __func__,
1270                                 all_options->as_mss.length, offset, optionsize);
1271                         got_mss_option = 1;
1272                         if (all_options->as_mss.length != 4) {
1273                                 return 1;
1274                         } else {
1275                                 tmp = ntohs(all_options->as_mss.mss);
1276                                 if (tmp > 0 && tmp <
1277                                         cm_node->tcp_cntxt.mss)
1278                                         cm_node->tcp_cntxt.mss = tmp;
1279                         }
1280                         break;
1281                 case OPTION_NUMBER_WINDOW_SCALE:
1282                         cm_node->tcp_cntxt.snd_wscale =
1283                                 all_options->as_windowscale.shiftcount;
1284                         break;
1285                 case OPTION_NUMBER_WRITE0:
1286                         cm_node->send_write0 = 1;
1287                         break;
1288                 default:
1289                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1290                                 all_options->as_base.optionnum);
1291                         break;
1292                 }
1293                 offset += all_options->as_base.length;
1294         }
1295         if ((!got_mss_option) && (syn_packet))
1296                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1297         return 0;
1298 }
1299
1300 static void drop_packet(struct sk_buff *skb)
1301 {
1302         atomic_inc(&cm_accel_dropped_pkts);
1303         dev_kfree_skb_any(skb);
1304 }
1305
1306 static void handle_fin_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1307         struct tcphdr *tcph)
1308 {
1309         atomic_inc(&cm_resets_recvd);
1310         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1311                 "refcnt=%d\n", cm_node, cm_node->state,
1312                 atomic_read(&cm_node->ref_count));
1313         cm_node->tcp_cntxt.rcv_nxt++;
1314         cleanup_retrans_entry(cm_node);
1315         switch (cm_node->state) {
1316         case NES_CM_STATE_SYN_RCVD:
1317         case NES_CM_STATE_SYN_SENT:
1318         case NES_CM_STATE_ESTABLISHED:
1319         case NES_CM_STATE_MPAREQ_SENT:
1320                 cm_node->state = NES_CM_STATE_LAST_ACK;
1321                 send_fin(cm_node, skb);
1322                 break;
1323         case NES_CM_STATE_FIN_WAIT1:
1324                 cm_node->state = NES_CM_STATE_CLOSING;
1325                 send_ack(cm_node, skb);
1326                 break;
1327         case NES_CM_STATE_FIN_WAIT2:
1328                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1329                 send_ack(cm_node, skb);
1330                 cm_node->state = NES_CM_STATE_CLOSED;
1331                 break;
1332         case NES_CM_STATE_TSA:
1333         default:
1334                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1335                         cm_node, cm_node->state);
1336                 drop_packet(skb);
1337                 break;
1338         }
1339 }
1340
1341
1342 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1343         struct tcphdr *tcph)
1344 {
1345
1346         int     reset = 0;      /* whether to send reset in case of err.. */
1347         atomic_inc(&cm_resets_recvd);
1348         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1349                         " refcnt=%d\n", cm_node, cm_node->state,
1350                         atomic_read(&cm_node->ref_count));
1351         cleanup_retrans_entry(cm_node);
1352         switch (cm_node->state) {
1353         case NES_CM_STATE_SYN_SENT:
1354         case NES_CM_STATE_MPAREQ_SENT:
1355                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1356                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1357                         cm_node->listener, cm_node->state);
1358                 active_open_err(cm_node, skb, reset);
1359                 break;
1360         /* For PASSIVE open states, remove the cm_node event */
1361         case NES_CM_STATE_ESTABLISHED:
1362         case NES_CM_STATE_SYN_RCVD:
1363         case NES_CM_STATE_LISTENING:
1364                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1365                 passive_open_err(cm_node, skb, reset);
1366                 break;
1367         case NES_CM_STATE_TSA:
1368         default:
1369                 break;
1370         }
1371 }
1372
1373 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb,
1374         enum nes_cm_event_type type)
1375 {
1376
1377         int     ret;
1378         int datasize = skb->len;
1379         u8 *dataloc = skb->data;
1380         ret = parse_mpa(cm_node, dataloc, datasize);
1381         if (ret < 0) {
1382                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1383                 if (type == NES_CM_EVENT_CONNECTED) {
1384                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1385                                 "cm_node=%p listener=%p state=%d\n", __func__,
1386                                 __LINE__, cm_node, cm_node->listener,
1387                                 cm_node->state);
1388                         active_open_err(cm_node, skb, 1);
1389                 } else {
1390                         passive_open_err(cm_node, skb, 1);
1391                 }
1392         } else {
1393                 cleanup_retrans_entry(cm_node);
1394                 dev_kfree_skb_any(skb);
1395                 if (type == NES_CM_EVENT_CONNECTED)
1396                         cm_node->state = NES_CM_STATE_TSA;
1397                 create_event(cm_node, type);
1398
1399         }
1400         return ;
1401 }
1402
1403 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1404 {
1405         switch (cm_node->state) {
1406         case NES_CM_STATE_SYN_SENT:
1407         case NES_CM_STATE_MPAREQ_SENT:
1408                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1409                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1410                         cm_node->listener, cm_node->state);
1411                 active_open_err(cm_node, skb, 1);
1412                 break;
1413         case NES_CM_STATE_ESTABLISHED:
1414         case NES_CM_STATE_SYN_RCVD:
1415                 passive_open_err(cm_node, skb, 1);
1416                 break;
1417         case NES_CM_STATE_TSA:
1418         default:
1419                 drop_packet(skb);
1420         }
1421 }
1422
1423 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1424         struct sk_buff *skb)
1425 {
1426         int err;
1427
1428         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1429         if (err)
1430                 active_open_err(cm_node, skb, 1);
1431
1432         return err;
1433 }
1434
1435 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1436         struct sk_buff *skb)
1437 {
1438         int err = 0;
1439         u32 seq;
1440         u32 ack_seq;
1441         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1442         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1443         u32 rcv_wnd;
1444         seq = ntohl(tcph->seq);
1445         ack_seq = ntohl(tcph->ack_seq);
1446         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1447         if (ack_seq != loc_seq_num)
1448                 err = 1;
1449         else if ((seq + rcv_wnd) < rcv_nxt)
1450                 err = 1;
1451         if (err) {
1452                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1453                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1454                         cm_node->listener, cm_node->state);
1455                 indicate_pkt_err(cm_node, skb);
1456                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1457                         "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1458                         rcv_wnd);
1459         }
1460         return err;
1461 }
1462
1463 /*
1464  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1465  * is created with a listener or it may comein as rexmitted packet which in
1466  * that case will be just dropped.
1467  */
1468
1469 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1470         struct tcphdr *tcph)
1471 {
1472         int ret;
1473         u32 inc_sequence;
1474         int optionsize;
1475
1476         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1477         skb_pull(skb, tcph->doff << 2);
1478         inc_sequence = ntohl(tcph->seq);
1479
1480         switch (cm_node->state) {
1481         case NES_CM_STATE_SYN_SENT:
1482         case NES_CM_STATE_MPAREQ_SENT:
1483                 /* Rcvd syn on active open connection*/
1484                 active_open_err(cm_node, skb, 1);
1485                 break;
1486         case NES_CM_STATE_LISTENING:
1487                 /* Passive OPEN */
1488                 cm_node->accept_pend = 1;
1489                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1490                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1491                                 cm_node->listener->backlog) {
1492                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1493                                 "pressure \n");
1494                         cm_backlog_drops++;
1495                         passive_open_err(cm_node, skb, 0);
1496                         break;
1497                 }
1498                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1499                         1);
1500                 if (ret) {
1501                         passive_open_err(cm_node, skb, 0);
1502                         /* drop pkt */
1503                         break;
1504                 }
1505                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1506                 BUG_ON(cm_node->send_entry);
1507                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1508                 send_syn(cm_node, 1, skb);
1509                 break;
1510         case NES_CM_STATE_TSA:
1511         case NES_CM_STATE_ESTABLISHED:
1512         case NES_CM_STATE_FIN_WAIT1:
1513         case NES_CM_STATE_FIN_WAIT2:
1514         case NES_CM_STATE_MPAREQ_RCVD:
1515         case NES_CM_STATE_LAST_ACK:
1516         case NES_CM_STATE_CLOSING:
1517         case NES_CM_STATE_UNKNOWN:
1518         case NES_CM_STATE_CLOSED:
1519         default:
1520                 drop_packet(skb);
1521                 break;
1522         }
1523 }
1524
1525 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1526         struct tcphdr *tcph)
1527 {
1528
1529         int ret;
1530         u32 inc_sequence;
1531         int optionsize;
1532
1533         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1534         skb_pull(skb, tcph->doff << 2);
1535         inc_sequence = ntohl(tcph->seq);
1536         switch (cm_node->state) {
1537         case NES_CM_STATE_SYN_SENT:
1538                 /* active open */
1539                 if (check_syn(cm_node, tcph, skb))
1540                         return;
1541                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1542                 /* setup options */
1543                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1544                 if (ret) {
1545                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1546                                 cm_node);
1547                         break;
1548                 }
1549                 cleanup_retrans_entry(cm_node);
1550                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1551                 send_mpa_request(cm_node, skb);
1552                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1553                 break;
1554         case NES_CM_STATE_MPAREQ_RCVD:
1555                 /* passive open, so should not be here */
1556                 passive_open_err(cm_node, skb, 1);
1557                 break;
1558         case NES_CM_STATE_ESTABLISHED:
1559         case NES_CM_STATE_FIN_WAIT1:
1560         case NES_CM_STATE_FIN_WAIT2:
1561         case NES_CM_STATE_LAST_ACK:
1562         case NES_CM_STATE_TSA:
1563         case NES_CM_STATE_CLOSING:
1564         case NES_CM_STATE_UNKNOWN:
1565         case NES_CM_STATE_CLOSED:
1566         case NES_CM_STATE_MPAREQ_SENT:
1567         default:
1568                 drop_packet(skb);
1569                 break;
1570         }
1571 }
1572
1573 static void handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1574         struct tcphdr *tcph)
1575 {
1576         int datasize = 0;
1577         u32 inc_sequence;
1578         u32 rem_seq_ack;
1579         u32 rem_seq;
1580         if (check_seq(cm_node, tcph, skb))
1581                 return;
1582
1583         skb_pull(skb, tcph->doff << 2);
1584         inc_sequence = ntohl(tcph->seq);
1585         rem_seq = ntohl(tcph->seq);
1586         rem_seq_ack =  ntohl(tcph->ack_seq);
1587         datasize = skb->len;
1588
1589         switch (cm_node->state) {
1590         case NES_CM_STATE_SYN_RCVD:
1591                 /* Passive OPEN */
1592                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1593                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1594                 if (datasize) {
1595                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1596                         cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1597                         handle_rcv_mpa(cm_node, skb, NES_CM_EVENT_MPA_REQ);
1598                  } else { /* rcvd ACK only */
1599                         dev_kfree_skb_any(skb);
1600                         cleanup_retrans_entry(cm_node);
1601                  }
1602                 break;
1603         case NES_CM_STATE_ESTABLISHED:
1604                 /* Passive OPEN */
1605                 /* We expect mpa frame to be received only */
1606                 if (datasize) {
1607                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1608                         cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1609                         handle_rcv_mpa(cm_node, skb,
1610                                 NES_CM_EVENT_MPA_REQ);
1611                 } else
1612                         drop_packet(skb);
1613                 break;
1614         case NES_CM_STATE_MPAREQ_SENT:
1615                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1616                 if (datasize) {
1617                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1618                         handle_rcv_mpa(cm_node, skb, NES_CM_EVENT_CONNECTED);
1619                 } else { /* Could be just an ack pkt.. */
1620                         cleanup_retrans_entry(cm_node);
1621                         dev_kfree_skb_any(skb);
1622                 }
1623                 break;
1624         case NES_CM_STATE_FIN_WAIT1:
1625         case NES_CM_STATE_SYN_SENT:
1626         case NES_CM_STATE_FIN_WAIT2:
1627         case NES_CM_STATE_TSA:
1628         case NES_CM_STATE_CLOSED:
1629         case NES_CM_STATE_MPAREQ_RCVD:
1630         case NES_CM_STATE_LAST_ACK:
1631         case NES_CM_STATE_CLOSING:
1632         case NES_CM_STATE_UNKNOWN:
1633         default:
1634                 drop_packet(skb);
1635                 break;
1636         }
1637 }
1638
1639
1640
1641 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1642         struct sk_buff *skb, int optionsize, int passive)
1643 {
1644         u8 *optionsloc = (u8 *)&tcph[1];
1645         if (optionsize) {
1646                 if (process_options(cm_node, optionsloc, optionsize,
1647                         (u32)tcph->syn)) {
1648                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
1649                                 __func__, cm_node);
1650                         if (passive)
1651                                 passive_open_err(cm_node, skb, 0);
1652                         else
1653                                 active_open_err(cm_node, skb, 0);
1654                         return 1;
1655                 }
1656         }
1657
1658         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1659                         cm_node->tcp_cntxt.snd_wscale;
1660
1661         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1662                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1663         return 0;
1664 }
1665
1666 /*
1667  * active_open_err() will send reset() if flag set..
1668  * It will also send ABORT event.
1669  */
1670
1671 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1672         int reset)
1673 {
1674         cleanup_retrans_entry(cm_node);
1675         if (reset) {
1676                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
1677                                 "state=%d\n", cm_node, cm_node->state);
1678                 add_ref_cm_node(cm_node);
1679                 send_reset(cm_node, skb);
1680         } else
1681                 dev_kfree_skb_any(skb);
1682
1683         cm_node->state = NES_CM_STATE_CLOSED;
1684         create_event(cm_node, NES_CM_EVENT_ABORTED);
1685 }
1686
1687 /*
1688  * passive_open_err() will either do a reset() or will free up the skb and
1689  * remove the cm_node.
1690  */
1691
1692 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1693         int reset)
1694 {
1695         cleanup_retrans_entry(cm_node);
1696         cm_node->state = NES_CM_STATE_CLOSED;
1697         if (reset) {
1698                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
1699                         "cm_node=%p state =%d\n", cm_node, cm_node->state);
1700                 send_reset(cm_node, skb);
1701         } else {
1702                 dev_kfree_skb_any(skb);
1703                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1704         }
1705 }
1706
1707 /*
1708  * free_retrans_entry() routines assumes that the retrans_list_lock has
1709  * been acquired before calling.
1710  */
1711 static void free_retrans_entry(struct nes_cm_node *cm_node)
1712 {
1713         struct nes_timer_entry *send_entry;
1714         send_entry = cm_node->send_entry;
1715         if (send_entry) {
1716                 cm_node->send_entry = NULL;
1717                 dev_kfree_skb_any(send_entry->skb);
1718                 kfree(send_entry);
1719                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1720         }
1721 }
1722
1723 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
1724 {
1725         unsigned long flags;
1726
1727         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1728         free_retrans_entry(cm_node);
1729         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1730 }
1731
1732 /**
1733  * process_packet
1734  * Returns skb if to be freed, else it will return NULL if already used..
1735  */
1736 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1737         struct nes_cm_core *cm_core)
1738 {
1739         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
1740         struct tcphdr *tcph = tcp_hdr(skb);
1741         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1742
1743         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1744                 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1745                 tcph->ack, tcph->rst, tcph->fin);
1746
1747         if (tcph->rst)
1748                 pkt_type = NES_PKT_TYPE_RST;
1749         else if (tcph->syn) {
1750                 pkt_type = NES_PKT_TYPE_SYN;
1751                 if (tcph->ack)
1752                         pkt_type = NES_PKT_TYPE_SYNACK;
1753         } else if (tcph->fin)
1754                 pkt_type = NES_PKT_TYPE_FIN;
1755         else if (tcph->ack)
1756                 pkt_type = NES_PKT_TYPE_ACK;
1757
1758         switch (pkt_type) {
1759         case NES_PKT_TYPE_SYN:
1760                 handle_syn_pkt(cm_node, skb, tcph);
1761                 break;
1762         case NES_PKT_TYPE_SYNACK:
1763                 handle_synack_pkt(cm_node, skb, tcph);
1764                 break;
1765         case NES_PKT_TYPE_ACK:
1766                 handle_ack_pkt(cm_node, skb, tcph);
1767                 break;
1768         case NES_PKT_TYPE_RST:
1769                 handle_rst_pkt(cm_node, skb, tcph);
1770                 break;
1771         case NES_PKT_TYPE_FIN:
1772                 handle_fin_pkt(cm_node, skb, tcph);
1773                 break;
1774         default:
1775                 drop_packet(skb);
1776                 break;
1777         }
1778 }
1779
1780 /**
1781  * mini_cm_listen - create a listen node with params
1782  */
1783 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1784         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1785 {
1786         struct nes_cm_listener *listener;
1787         unsigned long flags;
1788
1789         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1790                 cm_info->loc_addr, cm_info->loc_port);
1791
1792         /* cannot have multiple matching listeners */
1793         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1794                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1795         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1796                 /* find automatically incs ref count ??? */
1797                 atomic_dec(&listener->ref_count);
1798                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1799                 return NULL;
1800         }
1801
1802         if (!listener) {
1803                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1804                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1805                 if (!listener) {
1806                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1807                         return NULL;
1808                 }
1809
1810                 listener->loc_addr = htonl(cm_info->loc_addr);
1811                 listener->loc_port = htons(cm_info->loc_port);
1812                 listener->reused_node = 0;
1813
1814                 atomic_set(&listener->ref_count, 1);
1815         }
1816         /* pasive case */
1817         /* find already inc'ed the ref count */
1818         else {
1819                 listener->reused_node = 1;
1820         }
1821
1822         listener->cm_id = cm_info->cm_id;
1823         atomic_set(&listener->pend_accepts_cnt, 0);
1824         listener->cm_core = cm_core;
1825         listener->nesvnic = nesvnic;
1826         atomic_inc(&cm_core->node_cnt);
1827
1828         listener->conn_type = cm_info->conn_type;
1829         listener->backlog = cm_info->backlog;
1830         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1831
1832         if (!listener->reused_node) {
1833                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1834                 list_add(&listener->list, &cm_core->listen_list.list);
1835                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1836                 atomic_inc(&cm_core->listen_node_cnt);
1837         }
1838
1839         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
1840                         " listener = %p, backlog = %d, cm_id = %p.\n",
1841                         cm_info->loc_addr, cm_info->loc_port,
1842                         listener, listener->backlog, listener->cm_id);
1843
1844         return listener;
1845 }
1846
1847
1848 /**
1849  * mini_cm_connect - make a connection node with params
1850  */
1851 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1852         struct nes_vnic *nesvnic, u16 private_data_len,
1853         void *private_data, struct nes_cm_info *cm_info)
1854 {
1855         int ret = 0;
1856         struct nes_cm_node *cm_node;
1857         struct nes_cm_listener *loopbackremotelistener;
1858         struct nes_cm_node *loopbackremotenode;
1859         struct nes_cm_info loopback_cm_info;
1860         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
1861         struct ietf_mpa_frame *mpa_frame = NULL;
1862
1863         /* create a CM connection node */
1864         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
1865         if (!cm_node)
1866                 return NULL;
1867         mpa_frame = &cm_node->mpa_frame;
1868         strcpy(mpa_frame->key, IEFT_MPA_KEY_REQ);
1869         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
1870         mpa_frame->rev =  IETF_MPA_VERSION;
1871         mpa_frame->priv_data_len = htons(private_data_len);
1872
1873         /* set our node side to client (active) side */
1874         cm_node->tcp_cntxt.client = 1;
1875         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1876
1877         if (cm_info->loc_addr == cm_info->rem_addr) {
1878                 loopbackremotelistener = find_listener(cm_core,
1879                                 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
1880                                 NES_CM_LISTENER_ACTIVE_STATE);
1881                 if (loopbackremotelistener == NULL) {
1882                         create_event(cm_node, NES_CM_EVENT_ABORTED);
1883                 } else {
1884                         atomic_inc(&cm_loopbacks);
1885                         loopback_cm_info = *cm_info;
1886                         loopback_cm_info.loc_port = cm_info->rem_port;
1887                         loopback_cm_info.rem_port = cm_info->loc_port;
1888                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
1889                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
1890                                 &loopback_cm_info, loopbackremotelistener);
1891                         loopbackremotenode->loopbackpartner = cm_node;
1892                         loopbackremotenode->tcp_cntxt.rcv_wscale =
1893                                 NES_CM_DEFAULT_RCV_WND_SCALE;
1894                         cm_node->loopbackpartner = loopbackremotenode;
1895                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
1896                                 private_data_len);
1897                         loopbackremotenode->mpa_frame_size = private_data_len;
1898
1899                         /* we are done handling this state. */
1900                         /* set node to a TSA state */
1901                         cm_node->state = NES_CM_STATE_TSA;
1902                         cm_node->tcp_cntxt.rcv_nxt =
1903                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
1904                         loopbackremotenode->tcp_cntxt.rcv_nxt =
1905                                 cm_node->tcp_cntxt.loc_seq_num;
1906                         cm_node->tcp_cntxt.max_snd_wnd =
1907                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
1908                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
1909                                 cm_node->tcp_cntxt.rcv_wnd;
1910                         cm_node->tcp_cntxt.snd_wnd =
1911                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
1912                         loopbackremotenode->tcp_cntxt.snd_wnd =
1913                                 cm_node->tcp_cntxt.rcv_wnd;
1914                         cm_node->tcp_cntxt.snd_wscale =
1915                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
1916                         loopbackremotenode->tcp_cntxt.snd_wscale =
1917                                 cm_node->tcp_cntxt.rcv_wscale;
1918
1919                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
1920                 }
1921                 return cm_node;
1922         }
1923
1924         /* set our node side to client (active) side */
1925         cm_node->tcp_cntxt.client = 1;
1926         /* init our MPA frame ptr */
1927         memcpy(mpa_frame->priv_data, private_data, private_data_len);
1928
1929         cm_node->mpa_frame_size = mpa_frame_size;
1930
1931         /* send a syn and goto syn sent state */
1932         cm_node->state = NES_CM_STATE_SYN_SENT;
1933         ret = send_syn(cm_node, 0, NULL);
1934
1935         if (ret) {
1936                 /* error in sending the syn free up the cm_node struct */
1937                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
1938                         "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
1939                         cm_node->rem_addr, cm_node->rem_port, cm_node,
1940                         cm_node->cm_id);
1941                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1942                 cm_node = NULL;
1943         }
1944
1945         if (cm_node)
1946                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
1947                         "port=0x%04x, cm_node=%p, cm_id = %p.\n",
1948                         cm_node->rem_addr, cm_node->rem_port, cm_node,
1949                         cm_node->cm_id);
1950
1951         return cm_node;
1952 }
1953
1954
1955 /**
1956  * mini_cm_accept - accept a connection
1957  * This function is never called
1958  */
1959 static int mini_cm_accept(struct nes_cm_core *cm_core,
1960         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
1961 {
1962         return 0;
1963 }
1964
1965
1966 /**
1967  * mini_cm_reject - reject and teardown a connection
1968  */
1969 static int mini_cm_reject(struct nes_cm_core *cm_core,
1970         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
1971 {
1972         int ret = 0;
1973
1974         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
1975                 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
1976
1977         if (cm_node->tcp_cntxt.client)
1978                 return ret;
1979         cleanup_retrans_entry(cm_node);
1980         cm_node->state = NES_CM_STATE_CLOSED;
1981
1982         ret = send_reset(cm_node, NULL);
1983         return ret;
1984 }
1985
1986
1987 /**
1988  * mini_cm_close
1989  */
1990 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1991 {
1992         int ret = 0;
1993
1994         if (!cm_core || !cm_node)
1995                 return -EINVAL;
1996
1997         switch (cm_node->state) {
1998         case NES_CM_STATE_SYN_RCVD:
1999         case NES_CM_STATE_SYN_SENT:
2000         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2001         case NES_CM_STATE_ESTABLISHED:
2002         case NES_CM_STATE_ACCEPTING:
2003         case NES_CM_STATE_MPAREQ_SENT:
2004         case NES_CM_STATE_MPAREQ_RCVD:
2005                 cleanup_retrans_entry(cm_node);
2006                 send_reset(cm_node, NULL);
2007                 break;
2008         case NES_CM_STATE_CLOSE_WAIT:
2009                 cm_node->state = NES_CM_STATE_LAST_ACK;
2010                 send_fin(cm_node, NULL);
2011                 break;
2012         case NES_CM_STATE_FIN_WAIT1:
2013         case NES_CM_STATE_FIN_WAIT2:
2014         case NES_CM_STATE_LAST_ACK:
2015         case NES_CM_STATE_TIME_WAIT:
2016         case NES_CM_STATE_CLOSING:
2017                 ret = -1;
2018                 break;
2019         case NES_CM_STATE_LISTENING:
2020         case NES_CM_STATE_UNKNOWN:
2021         case NES_CM_STATE_INITED:
2022         case NES_CM_STATE_CLOSED:
2023                 ret = rem_ref_cm_node(cm_core, cm_node);
2024                 break;
2025         case NES_CM_STATE_TSA:
2026                 if (cm_node->send_entry)
2027                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2028                                 "send_entry=%p\n", cm_node->send_entry);
2029                 ret = rem_ref_cm_node(cm_core, cm_node);
2030                 break;
2031         }
2032         cm_node->cm_id = NULL;
2033         return ret;
2034 }
2035
2036
2037 /**
2038  * recv_pkt - recv an ETHERNET packet, and process it through CM
2039  * node state machine
2040  */
2041 static void mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2042         struct nes_vnic *nesvnic, struct sk_buff *skb)
2043 {
2044         struct nes_cm_node *cm_node = NULL;
2045         struct nes_cm_listener *listener = NULL;
2046         struct iphdr *iph;
2047         struct tcphdr *tcph;
2048         struct nes_cm_info nfo;
2049
2050         if (!skb)
2051                 return;
2052         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2053                 dev_kfree_skb_any(skb);
2054                 return;
2055         }
2056
2057         iph = (struct iphdr *)skb->data;
2058         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2059         skb_reset_network_header(skb);
2060         skb_set_transport_header(skb, sizeof(*tcph));
2061         if (!tcph) {
2062                 dev_kfree_skb_any(skb);
2063                 return;
2064         }
2065         skb->len = ntohs(iph->tot_len);
2066
2067         nfo.loc_addr = ntohl(iph->daddr);
2068         nfo.loc_port = ntohs(tcph->dest);
2069         nfo.rem_addr = ntohl(iph->saddr);
2070         nfo.rem_port = ntohs(tcph->source);
2071
2072         nes_debug(NES_DBG_CM, "Received packet: dest=" NIPQUAD_FMT
2073                   ":0x%04X src=" NIPQUAD_FMT ":0x%04X\n",
2074                   NIPQUAD(iph->daddr), tcph->dest,
2075                   NIPQUAD(iph->saddr), tcph->source);
2076
2077         do {
2078                 cm_node = find_node(cm_core,
2079                         nfo.rem_port, nfo.rem_addr,
2080                         nfo.loc_port, nfo.loc_addr);
2081
2082                 if (!cm_node) {
2083                         /* Only type of packet accepted are for */
2084                         /* the PASSIVE open (syn only) */
2085                         if ((!tcph->syn) || (tcph->ack)) {
2086                                 cm_packets_dropped++;
2087                                 break;
2088                         }
2089                         listener = find_listener(cm_core, nfo.loc_addr,
2090                                 nfo.loc_port,
2091                                 NES_CM_LISTENER_ACTIVE_STATE);
2092                         if (listener) {
2093                                 nfo.cm_id = listener->cm_id;
2094                                 nfo.conn_type = listener->conn_type;
2095                         } else {
2096                                 nes_debug(NES_DBG_CM, "Unable to find listener "
2097                                         "for the pkt\n");
2098                                 cm_packets_dropped++;
2099                                 dev_kfree_skb_any(skb);
2100                                 break;
2101                         }
2102
2103                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2104                                 listener);
2105                         if (!cm_node) {
2106                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2107                                         "node\n");
2108                                 cm_packets_dropped++;
2109                                 atomic_dec(&listener->ref_count);
2110                                 dev_kfree_skb_any(skb);
2111                                 break;
2112                         }
2113                         if (!tcph->rst && !tcph->fin) {
2114                                 cm_node->state = NES_CM_STATE_LISTENING;
2115                         } else {
2116                                 cm_packets_dropped++;
2117                                 rem_ref_cm_node(cm_core, cm_node);
2118                                 dev_kfree_skb_any(skb);
2119                                 break;
2120                         }
2121                         add_ref_cm_node(cm_node);
2122                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2123                         rem_ref_cm_node(cm_core, cm_node);
2124                         atomic_inc(&cm_accel_dropped_pkts);
2125                         dev_kfree_skb_any(skb);
2126                         break;
2127                 }
2128                 process_packet(cm_node, skb, cm_core);
2129                 rem_ref_cm_node(cm_core, cm_node);
2130         } while (0);
2131 }
2132
2133
2134 /**
2135  * nes_cm_alloc_core - allocate a top level instance of a cm core
2136  */
2137 static struct nes_cm_core *nes_cm_alloc_core(void)
2138 {
2139         int i;
2140
2141         struct nes_cm_core *cm_core;
2142         struct sk_buff *skb = NULL;
2143
2144         /* setup the CM core */
2145         /* alloc top level core control structure */
2146         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2147         if (!cm_core)
2148                 return NULL;
2149
2150         INIT_LIST_HEAD(&cm_core->connected_nodes);
2151         init_timer(&cm_core->tcp_timer);
2152         cm_core->tcp_timer.function = nes_cm_timer_tick;
2153
2154         cm_core->mtu   = NES_CM_DEFAULT_MTU;
2155         cm_core->state = NES_CM_STATE_INITED;
2156         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2157
2158         atomic_set(&cm_core->events_posted, 0);
2159
2160         /* init the packet lists */
2161         skb_queue_head_init(&cm_core->tx_free_list);
2162
2163         for (i = 0; i < NES_CM_DEFAULT_FRAME_CNT; i++) {
2164                 skb = dev_alloc_skb(cm_core->mtu);
2165                 if (!skb) {
2166                         kfree(cm_core);
2167                         return NULL;
2168                 }
2169                 /* add 'raw' skb to free frame list */
2170                 skb_queue_head(&cm_core->tx_free_list, skb);
2171         }
2172
2173         cm_core->api = &nes_cm_api;
2174
2175         spin_lock_init(&cm_core->ht_lock);
2176         spin_lock_init(&cm_core->listen_list_lock);
2177
2178         INIT_LIST_HEAD(&cm_core->listen_list.list);
2179
2180         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2181
2182         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2183         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2184         cm_core->post_event = nes_cm_post_event;
2185         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2186         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2187
2188         print_core(cm_core);
2189         return cm_core;
2190 }
2191
2192
2193 /**
2194  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2195  */
2196 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2197 {
2198         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2199
2200         if (!cm_core)
2201                 return -EINVAL;
2202
2203         barrier();
2204
2205         if (timer_pending(&cm_core->tcp_timer)) {
2206                 del_timer(&cm_core->tcp_timer);
2207         }
2208
2209         destroy_workqueue(cm_core->event_wq);
2210         destroy_workqueue(cm_core->disconn_wq);
2211         nes_debug(NES_DBG_CM, "\n");
2212         kfree(cm_core);
2213
2214         return 0;
2215 }
2216
2217
2218 /**
2219  * mini_cm_get
2220  */
2221 static int mini_cm_get(struct nes_cm_core *cm_core)
2222 {
2223         return cm_core->state;
2224 }
2225
2226
2227 /**
2228  * mini_cm_set
2229  */
2230 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2231 {
2232         int ret = 0;
2233
2234         switch (type) {
2235                 case NES_CM_SET_PKT_SIZE:
2236                         cm_core->mtu = value;
2237                         break;
2238                 case NES_CM_SET_FREE_PKT_Q_SIZE:
2239                         cm_core->free_tx_pkt_max = value;
2240                         break;
2241                 default:
2242                         /* unknown set option */
2243                         ret = -EINVAL;
2244         }
2245
2246         return ret;
2247 }
2248
2249
2250 /**
2251  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2252  * successfully exchanged when this is called
2253  */
2254 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2255 {
2256         int ret = 0;
2257
2258         if (!nesqp)
2259                 return -EINVAL;
2260
2261         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2262                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2263                         NES_QPCONTEXT_MISC_DROS);
2264
2265         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2266                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2267
2268         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2269
2270         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2271
2272         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2273                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2274
2275         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2276                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2277                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2278
2279         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2280                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2281                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2282
2283         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2284         nesqp->nesqp_context->ts_recent = 0;
2285         nesqp->nesqp_context->ts_age = 0;
2286         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2287         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2288         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2289         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2290                         cm_node->tcp_cntxt.rcv_wscale);
2291         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2292         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2293         nesqp->nesqp_context->srtt = 0;
2294         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2295         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2296         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2297         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2298         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2299         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2300
2301         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2302                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2303                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2304                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2305                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2306                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2307                         le32_to_cpu(nesqp->nesqp_context->misc));
2308         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2309         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2310         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2311
2312         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2313         cm_node->state = NES_CM_STATE_TSA;
2314
2315         return ret;
2316 }
2317
2318
2319 /**
2320  * nes_cm_disconn
2321  */
2322 int nes_cm_disconn(struct nes_qp *nesqp)
2323 {
2324         unsigned long flags;
2325
2326         spin_lock_irqsave(&nesqp->lock, flags);
2327         if (nesqp->disconn_pending == 0) {
2328                 nesqp->disconn_pending++;
2329                 spin_unlock_irqrestore(&nesqp->lock, flags);
2330                 /* init our disconnect work element, to */
2331                 INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);
2332
2333                 queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
2334         } else
2335                 spin_unlock_irqrestore(&nesqp->lock, flags);
2336
2337         return 0;
2338 }
2339
2340
2341 /**
2342  * nes_disconnect_worker
2343  */
2344 static void nes_disconnect_worker(struct work_struct *work)
2345 {
2346         struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);
2347
2348         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2349                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2350         nes_cm_disconn_true(nesqp);
2351 }
2352
2353
2354 /**
2355  * nes_cm_disconn_true
2356  */
2357 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2358 {
2359         unsigned long flags;
2360         int ret = 0;
2361         struct iw_cm_id *cm_id;
2362         struct iw_cm_event cm_event;
2363         struct nes_vnic *nesvnic;
2364         u16 last_ae;
2365         u8 original_hw_tcp_state;
2366         u8 original_ibqp_state;
2367         u8 issued_disconnect_reset = 0;
2368
2369         if (!nesqp) {
2370                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2371                 return -1;
2372         }
2373
2374         spin_lock_irqsave(&nesqp->lock, flags);
2375         cm_id = nesqp->cm_id;
2376         /* make sure we havent already closed this connection */
2377         if (!cm_id) {
2378                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2379                                 nesqp->hwqp.qp_id);
2380                 spin_unlock_irqrestore(&nesqp->lock, flags);
2381                 return -1;
2382         }
2383
2384         nesvnic = to_nesvnic(nesqp->ibqp.device);
2385         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2386
2387         original_hw_tcp_state = nesqp->hw_tcp_state;
2388         original_ibqp_state   = nesqp->ibqp_state;
2389         last_ae = nesqp->last_aeq;
2390
2391
2392         nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);
2393
2394         if ((nesqp->cm_id) && (cm_id->event_handler)) {
2395                 if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2396                                 ((original_ibqp_state == IB_QPS_RTS) &&
2397                                 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2398                         atomic_inc(&cm_disconnects);
2399                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2400                         if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
2401                                 issued_disconnect_reset = 1;
2402                                 cm_event.status = IW_CM_EVENT_STATUS_RESET;
2403                                 nes_debug(NES_DBG_CM, "Generating a CM "
2404                                         "Disconnect Event (status reset) for "
2405                                         "QP%u, cm_id = %p. \n",
2406                                         nesqp->hwqp.qp_id, cm_id);
2407                         } else
2408                                 cm_event.status = IW_CM_EVENT_STATUS_OK;
2409
2410                         cm_event.local_addr = cm_id->local_addr;
2411                         cm_event.remote_addr = cm_id->remote_addr;
2412                         cm_event.private_data = NULL;
2413                         cm_event.private_data_len = 0;
2414
2415                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2416                                 " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2417                                 "cm_id = %p, refcount = %u.\n",
2418                                 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2419                                 nesqp->hwqp.sq_tail, cm_id,
2420                                 atomic_read(&nesqp->refcount));
2421
2422                         spin_unlock_irqrestore(&nesqp->lock, flags);
2423                         ret = cm_id->event_handler(cm_id, &cm_event);
2424                         if (ret)
2425                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2426                                         "returned, ret=%d\n", ret);
2427                         spin_lock_irqsave(&nesqp->lock, flags);
2428                 }
2429
2430                 nesqp->disconn_pending = 0;
2431                 /* There might have been another AE while the lock was released */
2432                 original_hw_tcp_state = nesqp->hw_tcp_state;
2433                 original_ibqp_state   = nesqp->ibqp_state;
2434                 last_ae = nesqp->last_aeq;
2435
2436                 if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
2437                                 ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2438                                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2439                                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2440                                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2441                         atomic_inc(&cm_closes);
2442                         nesqp->cm_id = NULL;
2443                         nesqp->in_disconnect = 0;
2444                         spin_unlock_irqrestore(&nesqp->lock, flags);
2445                         nes_disconnect(nesqp, 1);
2446
2447                         cm_id->provider_data = nesqp;
2448                         /* Send up the close complete event */
2449                         cm_event.event = IW_CM_EVENT_CLOSE;
2450                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2451                         cm_event.provider_data = cm_id->provider_data;
2452                         cm_event.local_addr = cm_id->local_addr;
2453                         cm_event.remote_addr = cm_id->remote_addr;
2454                         cm_event.private_data = NULL;
2455                         cm_event.private_data_len = 0;
2456
2457                         ret = cm_id->event_handler(cm_id, &cm_event);
2458                         if (ret) {
2459                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2460                         }
2461
2462                         cm_id->rem_ref(cm_id);
2463
2464                         spin_lock_irqsave(&nesqp->lock, flags);
2465                         if (nesqp->flush_issued == 0) {
2466                                 nesqp->flush_issued = 1;
2467                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2468                                 flush_wqes(nesvnic->nesdev, nesqp,
2469                                         NES_CQP_FLUSH_RQ, 1);
2470                         } else
2471                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2472                 } else {
2473                         cm_id = nesqp->cm_id;
2474                         spin_unlock_irqrestore(&nesqp->lock, flags);
2475                         /* check to see if the inbound reset beat the outbound reset */
2476                         if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
2477                                 nes_debug(NES_DBG_CM, "QP%u: Decing refcount "
2478                                         "due to inbound reset beating the "
2479                                         "outbound reset.\n", nesqp->hwqp.qp_id);
2480                         }
2481                 }
2482         } else {
2483                 nesqp->disconn_pending = 0;
2484                 spin_unlock_irqrestore(&nesqp->lock, flags);
2485         }
2486
2487         return 0;
2488 }
2489
2490
2491 /**
2492  * nes_disconnect
2493  */
2494 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2495 {
2496         int ret = 0;
2497         struct nes_vnic *nesvnic;
2498         struct nes_device *nesdev;
2499
2500         nesvnic = to_nesvnic(nesqp->ibqp.device);
2501         if (!nesvnic)
2502                 return -EINVAL;
2503
2504         nesdev = nesvnic->nesdev;
2505
2506         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2507                         atomic_read(&nesvnic->netdev->refcnt));
2508
2509         if (nesqp->active_conn) {
2510
2511                 /* indicate this connection is NOT active */
2512                 nesqp->active_conn = 0;
2513         } else {
2514                 /* Need to free the Last Streaming Mode Message */
2515                 if (nesqp->ietf_frame) {
2516                         pci_free_consistent(nesdev->pcidev,
2517                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2518                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2519                 }
2520         }
2521
2522         /* close the CM node down if it is still active */
2523         if (nesqp->cm_node) {
2524                 nes_debug(NES_DBG_CM, "Call close API\n");
2525
2526                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2527         }
2528
2529         return ret;
2530 }
2531
2532
2533 /**
2534  * nes_accept
2535  */
2536 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2537 {
2538         u64 u64temp;
2539         struct ib_qp *ibqp;
2540         struct nes_qp *nesqp;
2541         struct nes_vnic *nesvnic;
2542         struct nes_device *nesdev;
2543         struct nes_cm_node *cm_node;
2544         struct nes_adapter *adapter;
2545         struct ib_qp_attr attr;
2546         struct iw_cm_event cm_event;
2547         struct nes_hw_qp_wqe *wqe;
2548         struct nes_v4_quad nes_quad;
2549         u32 crc_value;
2550         int ret;
2551
2552         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2553         if (!ibqp)
2554                 return -EINVAL;
2555
2556         /* get all our handles */
2557         nesqp = to_nesqp(ibqp);
2558         nesvnic = to_nesvnic(nesqp->ibqp.device);
2559         nesdev = nesvnic->nesdev;
2560         adapter = nesdev->nesadapter;
2561
2562         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2563         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2564                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2565                 nesvnic->netdev->name);
2566
2567         /* associate the node with the QP */
2568         nesqp->cm_node = (void *)cm_node;
2569         cm_node->nesqp = nesqp;
2570         nes_add_ref(&nesqp->ibqp);
2571
2572         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
2573                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2574         atomic_inc(&cm_accepts);
2575
2576         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2577                         atomic_read(&nesvnic->netdev->refcnt));
2578
2579         /* allocate the ietf frame and space for private data */
2580         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2581                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2582                 &nesqp->ietf_frame_pbase);
2583
2584         if (!nesqp->ietf_frame) {
2585                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
2586                         "data\n");
2587                 return -ENOMEM;
2588         }
2589
2590
2591         /* setup the MPA frame */
2592         nesqp->private_data_len = conn_param->private_data_len;
2593         memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2594
2595         memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2596                         conn_param->private_data_len);
2597
2598         nesqp->ietf_frame->priv_data_len =
2599                 cpu_to_be16(conn_param->private_data_len);
2600         nesqp->ietf_frame->rev = mpa_version;
2601         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2602
2603         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2604         wqe = &nesqp->hwqp.sq_vbase[0];
2605
2606         if (cm_id->remote_addr.sin_addr.s_addr !=
2607                         cm_id->local_addr.sin_addr.s_addr) {
2608                 u64temp = (unsigned long)nesqp;
2609                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2610                 set_wqe_64bit_value(wqe->wqe_words,
2611                         NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2612                         u64temp);
2613                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2614                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2615                         NES_IWARP_SQ_WQE_WRPDU);
2616                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2617                         cpu_to_le32(conn_param->private_data_len +
2618                         sizeof(struct ietf_mpa_frame));
2619                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] =
2620                         cpu_to_le32((u32)nesqp->ietf_frame_pbase);
2621                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] =
2622                         cpu_to_le32((u32)((u64)nesqp->ietf_frame_pbase >> 32));
2623                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2624                         cpu_to_le32(conn_param->private_data_len +
2625                         sizeof(struct ietf_mpa_frame));
2626                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
2627
2628                 nesqp->nesqp_context->ird_ord_sizes |=
2629                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2630                         NES_QPCONTEXT_ORDIRD_WRPDU);
2631         } else {
2632                 nesqp->nesqp_context->ird_ord_sizes |=
2633                         cpu_to_le32((NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2634                         NES_QPCONTEXT_ORDIRD_WRPDU |
2635                         NES_QPCONTEXT_ORDIRD_ALSMM));
2636         }
2637         nesqp->skip_lsmm = 1;
2638
2639
2640         /* Cache the cm_id in the qp */
2641         nesqp->cm_id = cm_id;
2642         cm_node->cm_id = cm_id;
2643
2644         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2645         cm_id->provider_data = nesqp;
2646         nesqp->active_conn   = 0;
2647
2648         if (cm_node->state == NES_CM_STATE_TSA)
2649                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2650                         cm_node);
2651
2652         nes_cm_init_tsa_conn(nesqp, cm_node);
2653
2654         nesqp->nesqp_context->tcpPorts[0] =
2655                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2656         nesqp->nesqp_context->tcpPorts[1] =
2657                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2658
2659         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2660                 nesqp->nesqp_context->ip0 =
2661                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2662         else
2663                 nesqp->nesqp_context->ip0 =
2664                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2665
2666         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2667                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2668                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2669
2670         nesqp->nesqp_context->arp_index_vlan |=
2671                 cpu_to_le32(nes_arp_table(nesdev,
2672                         le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2673                         NES_ARP_RESOLVE) << 16);
2674
2675         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2676                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2677
2678         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2679
2680         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2681                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2682         nesqp->nesqp_context->ird_ord_sizes |=
2683                 cpu_to_le32((u32)conn_param->ord);
2684
2685         memset(&nes_quad, 0, sizeof(nes_quad));
2686         nes_quad.DstIpAdrIndex =
2687                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2688         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2689                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2690         else
2691                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2692         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2693         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2694
2695         /* Produce hash key */
2696         crc_value = get_crc_value(&nes_quad);
2697         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2698         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2699                 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2700
2701         nesqp->hte_index &= adapter->hte_index_mask;
2702         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2703
2704         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2705
2706         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2707                         "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2708                         "private data length=%zu.\n", nesqp->hwqp.qp_id,
2709                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2710                         ntohs(cm_id->remote_addr.sin_port),
2711                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2712                         ntohs(cm_id->local_addr.sin_port),
2713                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2714                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2715                         conn_param->private_data_len +
2716                         sizeof(struct ietf_mpa_frame));
2717
2718         attr.qp_state = IB_QPS_RTS;
2719         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2720
2721         /* notify OF layer that accept event was successfull */
2722         cm_id->add_ref(cm_id);
2723
2724         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2725         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2726         cm_event.provider_data = (void *)nesqp;
2727         cm_event.local_addr = cm_id->local_addr;
2728         cm_event.remote_addr = cm_id->remote_addr;
2729         cm_event.private_data = NULL;
2730         cm_event.private_data_len = 0;
2731         ret = cm_id->event_handler(cm_id, &cm_event);
2732         if (cm_node->loopbackpartner) {
2733                 cm_node->loopbackpartner->mpa_frame_size =
2734                         nesqp->private_data_len;
2735                 /* copy entire MPA frame to our cm_node's frame */
2736                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2737                         nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2738                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2739         }
2740         if (ret)
2741                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2742                         "ret=%d\n", __func__, __LINE__, ret);
2743
2744         return 0;
2745 }
2746
2747
2748 /**
2749  * nes_reject
2750  */
2751 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2752 {
2753         struct nes_cm_node *cm_node;
2754         struct nes_cm_core *cm_core;
2755
2756         atomic_inc(&cm_rejects);
2757         cm_node = (struct nes_cm_node *) cm_id->provider_data;
2758         cm_core = cm_node->cm_core;
2759         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
2760
2761         strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
2762         memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
2763
2764         cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
2765         cm_node->mpa_frame.rev = mpa_version;
2766         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
2767
2768         cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
2769
2770         return 0;
2771 }
2772
2773
2774 /**
2775  * nes_connect
2776  * setup and launch cm connect node
2777  */
2778 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2779 {
2780         struct ib_qp *ibqp;
2781         struct nes_qp *nesqp;
2782         struct nes_vnic *nesvnic;
2783         struct nes_device *nesdev;
2784         struct nes_cm_node *cm_node;
2785         struct nes_cm_info cm_info;
2786
2787         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2788         if (!ibqp)
2789                 return -EINVAL;
2790         nesqp = to_nesqp(ibqp);
2791         if (!nesqp)
2792                 return -EINVAL;
2793         nesvnic = to_nesvnic(nesqp->ibqp.device);
2794         if (!nesvnic)
2795                 return -EINVAL;
2796         nesdev  = nesvnic->nesdev;
2797         if (!nesdev)
2798                 return -EINVAL;
2799
2800         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
2801                 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
2802                 ntohl(nesvnic->local_ipaddr),
2803                 ntohl(cm_id->remote_addr.sin_addr.s_addr),
2804                 ntohs(cm_id->remote_addr.sin_port),
2805                 ntohl(cm_id->local_addr.sin_addr.s_addr),
2806                 ntohs(cm_id->local_addr.sin_port));
2807
2808         atomic_inc(&cm_connects);
2809         nesqp->active_conn = 1;
2810
2811         /* cache the cm_id in the qp */
2812         nesqp->cm_id = cm_id;
2813
2814         cm_id->provider_data = nesqp;
2815
2816         nesqp->private_data_len = conn_param->private_data_len;
2817         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2818         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
2819         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
2820                 conn_param->private_data_len);
2821
2822         if (cm_id->local_addr.sin_addr.s_addr !=
2823                 cm_id->remote_addr.sin_addr.s_addr)
2824                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2825                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2826
2827         /* set up the connection params for the node */
2828         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
2829         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
2830         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
2831         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
2832         cm_info.cm_id = cm_id;
2833         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2834
2835         cm_id->add_ref(cm_id);
2836
2837         /* create a connect CM node connection */
2838         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
2839                 conn_param->private_data_len, (void *)conn_param->private_data,
2840                 &cm_info);
2841         if (!cm_node) {
2842                 if (cm_id->local_addr.sin_addr.s_addr !=
2843                                 cm_id->remote_addr.sin_addr.s_addr)
2844                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2845                                 PCI_FUNC(nesdev->pcidev->devfn),
2846                                 NES_MANAGE_APBVT_DEL);
2847
2848                 cm_id->rem_ref(cm_id);
2849                 return -ENOMEM;
2850         }
2851
2852         cm_node->apbvt_set = 1;
2853         nesqp->cm_node = cm_node;
2854         cm_node->nesqp = nesqp;
2855         nes_add_ref(&nesqp->ibqp);
2856
2857         return 0;
2858 }
2859
2860
2861 /**
2862  * nes_create_listen
2863  */
2864 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
2865 {
2866         struct nes_vnic *nesvnic;
2867         struct nes_cm_listener *cm_node;
2868         struct nes_cm_info cm_info;
2869         struct nes_adapter *adapter;
2870         int err;
2871
2872
2873         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
2874                         cm_id, ntohs(cm_id->local_addr.sin_port));
2875
2876         nesvnic = to_nesvnic(cm_id->device);
2877         if (!nesvnic)
2878                 return -EINVAL;
2879         adapter = nesvnic->nesdev->nesadapter;
2880         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
2881                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
2882
2883         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
2884                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
2885
2886         /* setup listen params in our api call struct */
2887         cm_info.loc_addr = nesvnic->local_ipaddr;
2888         cm_info.loc_port = cm_id->local_addr.sin_port;
2889         cm_info.backlog = backlog;
2890         cm_info.cm_id = cm_id;
2891
2892         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2893
2894
2895         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
2896         if (!cm_node) {
2897                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
2898                                 __func__, __LINE__);
2899                 return -ENOMEM;
2900         }
2901
2902         cm_id->provider_data = cm_node;
2903
2904         if (!cm_node->reused_node) {
2905                 err = nes_manage_apbvt(nesvnic,
2906                         ntohs(cm_id->local_addr.sin_port),
2907                         PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
2908                         NES_MANAGE_APBVT_ADD);
2909                 if (err) {
2910                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
2911                                 err);
2912                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
2913                         return err;
2914                 }
2915                 cm_listens_created++;
2916         }
2917
2918         cm_id->add_ref(cm_id);
2919         cm_id->provider_data = (void *)cm_node;
2920
2921
2922         return 0;
2923 }
2924
2925
2926 /**
2927  * nes_destroy_listen
2928  */
2929 int nes_destroy_listen(struct iw_cm_id *cm_id)
2930 {
2931         if (cm_id->provider_data)
2932                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
2933         else
2934                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
2935
2936         cm_id->rem_ref(cm_id);
2937
2938         return 0;
2939 }
2940
2941
2942 /**
2943  * nes_cm_recv
2944  */
2945 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
2946 {
2947         cm_packets_received++;
2948         if ((g_cm_core) && (g_cm_core->api)) {
2949                 g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
2950         } else {
2951                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
2952                                 " cm is not setup properly.\n");
2953         }
2954
2955         return 0;
2956 }
2957
2958
2959 /**
2960  * nes_cm_start
2961  * Start and init a cm core module
2962  */
2963 int nes_cm_start(void)
2964 {
2965         nes_debug(NES_DBG_CM, "\n");
2966         /* create the primary CM core, pass this handle to subsequent core inits */
2967         g_cm_core = nes_cm_alloc_core();
2968         if (g_cm_core) {
2969                 return 0;
2970         } else {
2971                 return -ENOMEM;
2972         }
2973 }
2974
2975
2976 /**
2977  * nes_cm_stop
2978  * stop and dealloc all cm core instances
2979  */
2980 int nes_cm_stop(void)
2981 {
2982         g_cm_core->api->destroy_cm_core(g_cm_core);
2983         return 0;
2984 }
2985
2986
2987 /**
2988  * cm_event_connected
2989  * handle a connected event, setup QPs and HW
2990  */
2991 static void cm_event_connected(struct nes_cm_event *event)
2992 {
2993         u64 u64temp;
2994         struct nes_qp *nesqp;
2995         struct nes_vnic *nesvnic;
2996         struct nes_device *nesdev;
2997         struct nes_cm_node *cm_node;
2998         struct nes_adapter *nesadapter;
2999         struct ib_qp_attr attr;
3000         struct iw_cm_id *cm_id;
3001         struct iw_cm_event cm_event;
3002         struct nes_hw_qp_wqe *wqe;
3003         struct nes_v4_quad nes_quad;
3004         u32 crc_value;
3005         int ret;
3006
3007         /* get all our handles */
3008         cm_node = event->cm_node;
3009         cm_id = cm_node->cm_id;
3010         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3011         nesqp = (struct nes_qp *)cm_id->provider_data;
3012         nesvnic = to_nesvnic(nesqp->ibqp.device);
3013         nesdev = nesvnic->nesdev;
3014         nesadapter = nesdev->nesadapter;
3015
3016         if (nesqp->destroyed) {
3017                 return;
3018         }
3019         atomic_inc(&cm_connecteds);
3020         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3021                         " local port 0x%04X. jiffies = %lu.\n",
3022                         nesqp->hwqp.qp_id,
3023                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
3024                         ntohs(cm_id->remote_addr.sin_port),
3025                         ntohs(cm_id->local_addr.sin_port),
3026                         jiffies);
3027
3028         nes_cm_init_tsa_conn(nesqp, cm_node);
3029
3030         /* set the QP tsa context */
3031         nesqp->nesqp_context->tcpPorts[0] =
3032                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3033         nesqp->nesqp_context->tcpPorts[1] =
3034                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3035         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3036                 nesqp->nesqp_context->ip0 =
3037                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3038         else
3039                 nesqp->nesqp_context->ip0 =
3040                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3041
3042         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3043                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3044                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3045         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3046                         nes_arp_table(nesdev,
3047                         le32_to_cpu(nesqp->nesqp_context->ip0),
3048                         NULL, NES_ARP_RESOLVE) << 16);
3049         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3050                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3051         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3052         nesqp->nesqp_context->ird_ord_sizes |=
3053                         cpu_to_le32((u32)1 <<
3054                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3055
3056         /* Adjust tail for not having a LSMM */
3057         nesqp->hwqp.sq_tail = 1;
3058
3059 #if defined(NES_SEND_FIRST_WRITE)
3060         if (cm_node->send_write0) {
3061                 nes_debug(NES_DBG_CM, "Sending first write.\n");
3062                 wqe = &nesqp->hwqp.sq_vbase[0];
3063                 u64temp = (unsigned long)nesqp;
3064                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3065                 set_wqe_64bit_value(wqe->wqe_words,
3066                                 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3067                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3068                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3069                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3070                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3071                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3072                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3073                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3074
3075                 /* use the reserved spot on the WQ for the extra first WQE */
3076                 nesqp->nesqp_context->ird_ord_sizes &=
3077                         cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3078                                                 NES_QPCONTEXT_ORDIRD_WRPDU |
3079                                                 NES_QPCONTEXT_ORDIRD_ALSMM));
3080                 nesqp->skip_lsmm = 1;
3081                 nesqp->hwqp.sq_tail = 0;
3082                 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3083                                 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3084         }
3085 #endif
3086
3087         memset(&nes_quad, 0, sizeof(nes_quad));
3088
3089         nes_quad.DstIpAdrIndex =
3090                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3091         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3092                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3093         else
3094                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3095         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3096         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3097
3098         /* Produce hash key */
3099         crc_value = get_crc_value(&nes_quad);
3100         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3101         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3102                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3103
3104         nesqp->hte_index &= nesadapter->hte_index_mask;
3105         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3106
3107         nesqp->ietf_frame = &cm_node->mpa_frame;
3108         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3109         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3110
3111         /* notify OF layer we successfully created the requested connection */
3112         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3113         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
3114         cm_event.provider_data = cm_id->provider_data;
3115         cm_event.local_addr.sin_family = AF_INET;
3116         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3117         cm_event.remote_addr = cm_id->remote_addr;
3118
3119         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3120         cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3121
3122         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3123         ret = cm_id->event_handler(cm_id, &cm_event);
3124         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3125
3126         if (ret)
3127                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3128                         "ret=%d\n", __func__, __LINE__, ret);
3129         attr.qp_state = IB_QPS_RTS;
3130         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3131
3132         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3133                 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3134
3135         return;
3136 }
3137
3138
3139 /**
3140  * cm_event_connect_error
3141  */
3142 static void cm_event_connect_error(struct nes_cm_event *event)
3143 {
3144         struct nes_qp *nesqp;
3145         struct iw_cm_id *cm_id;
3146         struct iw_cm_event cm_event;
3147         /* struct nes_cm_info cm_info; */
3148         int ret;
3149
3150         if (!event->cm_node)
3151                 return;
3152
3153         cm_id = event->cm_node->cm_id;
3154         if (!cm_id) {
3155                 return;
3156         }
3157
3158         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3159         nesqp = cm_id->provider_data;
3160
3161         if (!nesqp) {
3162                 return;
3163         }
3164
3165         /* notify OF layer about this connection error event */
3166         /* cm_id->rem_ref(cm_id); */
3167         nesqp->cm_id = NULL;
3168         cm_id->provider_data = NULL;
3169         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3170         cm_event.status = IW_CM_EVENT_STATUS_REJECTED;
3171         cm_event.provider_data = cm_id->provider_data;
3172         cm_event.local_addr = cm_id->local_addr;
3173         cm_event.remote_addr = cm_id->remote_addr;
3174         cm_event.private_data = NULL;
3175         cm_event.private_data_len = 0;
3176
3177         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3178                 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3179                 cm_event.remote_addr.sin_addr.s_addr);
3180
3181         ret = cm_id->event_handler(cm_id, &cm_event);
3182         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3183         if (ret)
3184                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3185                         "ret=%d\n", __func__, __LINE__, ret);
3186         cm_id->rem_ref(cm_id);
3187
3188         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3189         return;
3190 }
3191
3192
3193 /**
3194  * cm_event_reset
3195  */
3196 static void cm_event_reset(struct nes_cm_event *event)
3197 {
3198         struct nes_qp *nesqp;
3199         struct iw_cm_id *cm_id;
3200         struct iw_cm_event cm_event;
3201         /* struct nes_cm_info cm_info; */
3202         int ret;
3203
3204         if (!event->cm_node)
3205                 return;
3206
3207         if (!event->cm_node->cm_id)
3208                 return;
3209
3210         cm_id = event->cm_node->cm_id;
3211
3212         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3213         nesqp = cm_id->provider_data;
3214
3215         nesqp->cm_id = NULL;
3216         /* cm_id->provider_data = NULL; */
3217         cm_event.event = IW_CM_EVENT_DISCONNECT;
3218         cm_event.status = IW_CM_EVENT_STATUS_RESET;
3219         cm_event.provider_data = cm_id->provider_data;
3220         cm_event.local_addr = cm_id->local_addr;
3221         cm_event.remote_addr = cm_id->remote_addr;
3222         cm_event.private_data = NULL;
3223         cm_event.private_data_len = 0;
3224
3225         ret = cm_id->event_handler(cm_id, &cm_event);
3226         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3227
3228
3229         /* notify OF layer about this connection error event */
3230         cm_id->rem_ref(cm_id);
3231
3232         return;
3233 }
3234
3235
3236 /**
3237  * cm_event_mpa_req
3238  */
3239 static void cm_event_mpa_req(struct nes_cm_event *event)
3240 {
3241         struct iw_cm_id   *cm_id;
3242         struct iw_cm_event cm_event;
3243         int ret;
3244         struct nes_cm_node *cm_node;
3245
3246         cm_node = event->cm_node;
3247         if (!cm_node)
3248                 return;
3249         cm_id = cm_node->cm_id;
3250
3251         atomic_inc(&cm_connect_reqs);
3252         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3253                         cm_node, cm_id, jiffies);
3254
3255         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3256         cm_event.status = IW_CM_EVENT_STATUS_OK;
3257         cm_event.provider_data = (void *)cm_node;
3258
3259         cm_event.local_addr.sin_family = AF_INET;
3260         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3261         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3262
3263         cm_event.remote_addr.sin_family = AF_INET;
3264         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3265         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3266
3267                 cm_event.private_data                = cm_node->mpa_frame_buf;
3268                 cm_event.private_data_len            = (u8) cm_node->mpa_frame_size;
3269
3270         ret = cm_id->event_handler(cm_id, &cm_event);
3271         if (ret)
3272                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
3273                                 __func__, __LINE__, ret);
3274
3275         return;
3276 }
3277
3278
3279 static void nes_cm_event_handler(struct work_struct *);
3280
3281 /**
3282  * nes_cm_post_event
3283  * post an event to the cm event handler
3284  */
3285 static int nes_cm_post_event(struct nes_cm_event *event)
3286 {
3287         atomic_inc(&event->cm_node->cm_core->events_posted);
3288         add_ref_cm_node(event->cm_node);
3289         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3290         INIT_WORK(&event->event_work, nes_cm_event_handler);
3291         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3292                 event->cm_node, event);
3293
3294         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3295
3296         nes_debug(NES_DBG_CM, "Exit\n");
3297         return 0;
3298 }
3299
3300
3301 /**
3302  * nes_cm_event_handler
3303  * worker function to handle cm events
3304  * will free instance of nes_cm_event
3305  */
3306 static void nes_cm_event_handler(struct work_struct *work)
3307 {
3308         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3309                         event_work);
3310         struct nes_cm_core *cm_core;
3311
3312         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3313                 return;
3314
3315         cm_core = event->cm_node->cm_core;
3316         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3317                 event, event->type, atomic_read(&cm_core->events_posted));
3318
3319         switch (event->type) {
3320         case NES_CM_EVENT_MPA_REQ:
3321                 cm_event_mpa_req(event);
3322                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3323                         event->cm_node);
3324                 break;
3325         case NES_CM_EVENT_RESET:
3326                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3327                         event->cm_node);
3328                 cm_event_reset(event);
3329                 break;
3330         case NES_CM_EVENT_CONNECTED:
3331                 if ((!event->cm_node->cm_id) ||
3332                         (event->cm_node->state != NES_CM_STATE_TSA))
3333                         break;
3334                 cm_event_connected(event);
3335                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3336                 break;
3337         case NES_CM_EVENT_ABORTED:
3338                 if ((!event->cm_node->cm_id) ||
3339                         (event->cm_node->state == NES_CM_STATE_TSA))
3340                         break;
3341                 cm_event_connect_error(event);
3342                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3343                 break;
3344         case NES_CM_EVENT_DROPPED_PKT:
3345                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3346                 break;
3347         default:
3348                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3349                 break;
3350         }
3351
3352         atomic_dec(&cm_core->events_posted);
3353         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3354         rem_ref_cm_node(cm_core, event->cm_node);
3355         kfree(event);
3356
3357         return;
3358 }