drivers/infiniband/hw/nes/nes_cm.c

   1 /*
   2  * Copyright (c) 2006 - 2009 Intel-NE, Inc.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34
  35 #define TCPOPT_TIMESTAMP 8
  36
  37 #include <asm/atomic.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/ip.h>
  40 #include <linux/tcp.h>
  41 #include <linux/init.h>
  42 #include <linux/if_arp.h>
  43 #include <linux/if_vlan.h>
  44 #include <linux/notifier.h>
  45 #include <linux/net.h>
  46 #include <linux/types.h>
  47 #include <linux/timer.h>
  48 #include <linux/time.h>
  49 #include <linux/delay.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/random.h>
  53 #include <linux/list.h>
  54 #include <linux/threads.h>
  55 #include <net/arp.h>
  56 #include <net/neighbour.h>
  57 #include <net/route.h>
  58 #include <net/ip_fib.h>
  59 #include <net/tcp.h>
  60
  61 #include "nes.h"
  62
  63 u32 cm_packets_sent;
  64 u32 cm_packets_bounced;
  65 u32 cm_packets_dropped;
  66 u32 cm_packets_retrans;
  67 u32 cm_packets_created;
  68 u32 cm_packets_received;
  69 u32 cm_listens_created;
  70 u32 cm_listens_destroyed;
  71 u32 cm_backlog_drops;
  72 atomic_t cm_loopbacks;
  73 atomic_t cm_nodes_created;
  74 atomic_t cm_nodes_destroyed;
  75 atomic_t cm_accel_dropped_pkts;
  76 atomic_t cm_resets_recvd;
  77
  78 static inline int mini_cm_accelerated(struct nes_cm_core *,
  79         struct nes_cm_node *);
  80 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
  81         struct nes_vnic *, struct nes_cm_info *);
  82 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
  83 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *,
  84         struct nes_vnic *, u16, void *, struct nes_cm_info *);
  85 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
  86 static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
  87         struct nes_cm_node *);
  88 static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
  89         struct nes_cm_node *);
  90 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *,
  91         struct sk_buff *);
  92 static int mini_cm_dealloc_core(struct nes_cm_core *);
  93 static int mini_cm_get(struct nes_cm_core *);
  94 static int mini_cm_set(struct nes_cm_core *, u32, u32);
  95
  96 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *,
  97         void *, u32, void *, u32, u8);
  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_mpa_reject(struct nes_cm_node *);
 108 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
 109 static int send_reset(struct nes_cm_node *, struct sk_buff *);
 110 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
 111 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
 112 static void process_packet(struct nes_cm_node *, struct sk_buff *,
 113         struct nes_cm_core *);
 114
 115 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
 116 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
 117 static void cleanup_retrans_entry(struct nes_cm_node *);
 118 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
 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 static void cm_event_mpa_reject(struct nes_cm_event *);
 129 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
 130
 131 static void print_core(struct nes_cm_core *core);
 132
 133 /* External CM API Interface */
 134 /* instance of function pointers for client API */
 135 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
 136 static struct nes_cm_ops nes_cm_api = {
 137         mini_cm_accelerated,
 138         mini_cm_listen,
 139         mini_cm_del_listen,
 140         mini_cm_connect,
 141         mini_cm_close,
 142         mini_cm_accept,
 143         mini_cm_reject,
 144         mini_cm_recv_pkt,
 145         mini_cm_dealloc_core,
 146         mini_cm_get,
 147         mini_cm_set
 148 };
 149
 150 static struct nes_cm_core *g_cm_core;
 151
 152 atomic_t cm_connects;
 153 atomic_t cm_accepts;
 154 atomic_t cm_disconnects;
 155 atomic_t cm_closes;
 156 atomic_t cm_connecteds;
 157 atomic_t cm_connect_reqs;
 158 atomic_t cm_rejects;
 159
 160
 161 /**
 162  * create_event
 163  */
 164 static struct nes_cm_event *create_event(struct nes_cm_node *cm_node,
 165                 enum nes_cm_event_type type)
 166 {
 167         struct nes_cm_event *event;
 168
 169         if (!cm_node->cm_id)
 170                 return NULL;
 171
 172         /* allocate an empty event */
 173         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 174
 175         if (!event)
 176                 return NULL;
 177
 178         event->type = type;
 179         event->cm_node = cm_node;
 180         event->cm_info.rem_addr = cm_node->rem_addr;
 181         event->cm_info.loc_addr = cm_node->loc_addr;
 182         event->cm_info.rem_port = cm_node->rem_port;
 183         event->cm_info.loc_port = cm_node->loc_port;
 184         event->cm_info.cm_id = cm_node->cm_id;
 185
 186         nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
 187                 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
 188                 cm_node, event, type, event->cm_info.loc_addr,
 189                 event->cm_info.loc_port, event->cm_info.rem_addr,
 190                 event->cm_info.rem_port);
 191
 192         nes_cm_post_event(event);
 193         return event;
 194 }
 195
 196
 197 /**
 198  * send_mpa_request
 199  */
 200 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
 201 {
 202         if (!skb) {
 203                 nes_debug(NES_DBG_CM, "skb set to NULL\n");
 204                 return -1;
 205         }
 206
 207         /* send an MPA Request frame */
 208         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 209                         cm_node->mpa_frame_size, SET_ACK);
 210
 211         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 212 }
 213
 214
 215
 216 static int send_mpa_reject(struct nes_cm_node *cm_node)
 217 {
 218         struct sk_buff  *skb = NULL;
 219
 220         skb = dev_alloc_skb(MAX_CM_BUFFER);
 221         if (!skb) {
 222                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 223                 return -ENOMEM;
 224         }
 225
 226         /* send an MPA reject frame */
 227         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 228                         cm_node->mpa_frame_size, SET_ACK | SET_FIN);
 229
 230         cm_node->state = NES_CM_STATE_FIN_WAIT1;
 231         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 232 }
 233
 234
 235 /**
 236  * recv_mpa - process a received TCP pkt, we are expecting an
 237  * IETF MPA frame
 238  */
 239 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
 240                 u32 len)
 241 {
 242         struct ietf_mpa_frame *mpa_frame;
 243
 244         *type = NES_MPA_REQUEST_ACCEPT;
 245
 246         /* assume req frame is in tcp data payload */
 247         if (len < sizeof(struct ietf_mpa_frame)) {
 248                 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
 249                 return -EINVAL;
 250         }
 251
 252         mpa_frame = (struct ietf_mpa_frame *)buffer;
 253         cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
 254
 255         if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
 256                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
 257                                 " complete (%x + %x != %x)\n",
 258                                 cm_node->mpa_frame_size,
 259                                 (u32)sizeof(struct ietf_mpa_frame), len);
 260                 return -EINVAL;
 261         }
 262         /* make sure it does not exceed the max size */
 263         if (len > MAX_CM_BUFFER) {
 264                 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
 265                                 " (%x + %x != %x)\n",
 266                                 cm_node->mpa_frame_size,
 267                                 (u32)sizeof(struct ietf_mpa_frame), len);
 268                 return -EINVAL;
 269         }
 270
 271         /* copy entire MPA frame to our cm_node's frame */
 272         memcpy(cm_node->mpa_frame_buf, buffer + sizeof(struct ietf_mpa_frame),
 273                         cm_node->mpa_frame_size);
 274
 275         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
 276                 *type = NES_MPA_REQUEST_REJECT;
 277         return 0;
 278 }
 279
 280
 281 /**
 282  * form_cm_frame - get a free packet and build empty frame Use
 283  * node info to build.
 284  */
 285 static void form_cm_frame(struct sk_buff *skb,
 286         struct nes_cm_node *cm_node, void *options, u32 optionsize,
 287         void *data, u32 datasize, u8 flags)
 288 {
 289         struct tcphdr *tcph;
 290         struct iphdr *iph;
 291         struct ethhdr *ethh;
 292         u8 *buf;
 293         u16 packetsize = sizeof(*iph);
 294
 295         packetsize += sizeof(*tcph);
 296         packetsize +=  optionsize + datasize;
 297
 298         memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
 299
 300         skb->len = 0;
 301         buf = skb_put(skb, packetsize + ETH_HLEN);
 302
 303         ethh = (struct ethhdr *) buf;
 304         buf += ETH_HLEN;
 305
 306         iph = (struct iphdr *)buf;
 307         buf += sizeof(*iph);
 308         tcph = (struct tcphdr *)buf;
 309         skb_reset_mac_header(skb);
 310         skb_set_network_header(skb, ETH_HLEN);
 311         skb_set_transport_header(skb, ETH_HLEN+sizeof(*iph));
 312         buf += sizeof(*tcph);
 313
 314         skb->ip_summed = CHECKSUM_PARTIAL;
 315         skb->protocol = htons(0x800);
 316         skb->data_len = 0;
 317         skb->mac_len = ETH_HLEN;
 318
 319         memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
 320         memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
 321         ethh->h_proto = htons(0x0800);
 322
 323         iph->version = IPVERSION;
 324         iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
 325         iph->tos = 0;
 326         iph->tot_len = htons(packetsize);
 327         iph->id = htons(++cm_node->tcp_cntxt.loc_id);
 328
 329         iph->frag_off = htons(0x4000);
 330         iph->ttl = 0x40;
 331         iph->protocol = 0x06;   /* IPPROTO_TCP */
 332
 333         iph->saddr = htonl(cm_node->loc_addr);
 334         iph->daddr = htonl(cm_node->rem_addr);
 335
 336         tcph->source = htons(cm_node->loc_port);
 337         tcph->dest = htons(cm_node->rem_port);
 338         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
 339
 340         if (flags & SET_ACK) {
 341                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
 342                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
 343                 tcph->ack = 1;
 344         } else
 345                 tcph->ack_seq = 0;
 346
 347         if (flags & SET_SYN) {
 348                 cm_node->tcp_cntxt.loc_seq_num++;
 349                 tcph->syn = 1;
 350         } else
 351                 cm_node->tcp_cntxt.loc_seq_num += datasize;
 352
 353         if (flags & SET_FIN) {
 354                 cm_node->tcp_cntxt.loc_seq_num++;
 355                 tcph->fin = 1;
 356         }
 357
 358         if (flags & SET_RST)
 359                 tcph->rst = 1;
 360
 361         tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
 362         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
 363         tcph->urg_ptr = 0;
 364         if (optionsize)
 365                 memcpy(buf, options, optionsize);
 366         buf += optionsize;
 367         if (datasize)
 368                 memcpy(buf, data, datasize);
 369
 370         skb_shinfo(skb)->nr_frags = 0;
 371         cm_packets_created++;
 372
 373 }
 374
 375
 376 /**
 377  * print_core - dump a cm core
 378  */
 379 static void print_core(struct nes_cm_core *core)
 380 {
 381         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 382         nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
 383         if (!core)
 384                 return;
 385         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 386
 387         nes_debug(NES_DBG_CM, "State         : %u \n",  core->state);
 388
 389         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
 390         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
 391
 392         nes_debug(NES_DBG_CM, "core          : %p \n", core);
 393
 394         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
 395 }
 396
 397
 398 /**
 399  * schedule_nes_timer
 400  * note - cm_node needs to be protected before calling this. Encase in:
 401  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 402  */
 403 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
 404                 enum nes_timer_type type, int send_retrans,
 405                 int close_when_complete)
 406 {
 407         unsigned long  flags;
 408         struct nes_cm_core *cm_core = cm_node->cm_core;
 409         struct nes_timer_entry *new_send;
 410         int ret = 0;
 411         u32 was_timer_set;
 412
 413         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
 414         if (!new_send)
 415                 return -ENOMEM;
 416
 417         /* new_send->timetosend = currenttime */
 418         new_send->retrycount = NES_DEFAULT_RETRYS;
 419         new_send->retranscount = NES_DEFAULT_RETRANS;
 420         new_send->skb = skb;
 421         new_send->timetosend = jiffies;
 422         new_send->type = type;
 423         new_send->netdev = cm_node->netdev;
 424         new_send->send_retrans = send_retrans;
 425         new_send->close_when_complete = close_when_complete;
 426
 427         if (type == NES_TIMER_TYPE_CLOSE) {
 428                 new_send->timetosend += (HZ/10);
 429                 if (cm_node->recv_entry) {
 430                         kfree(new_send);
 431                         WARN_ON(1);
 432                         return -EINVAL;
 433                 }
 434                 cm_node->recv_entry = new_send;
 435         }
 436
 437         if (type == NES_TIMER_TYPE_SEND) {
 438                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 439                 atomic_inc(&new_send->skb->users);
 440                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 441                 cm_node->send_entry = new_send;
 442                 add_ref_cm_node(cm_node);
 443                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 444                 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
 445
 446                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
 447                 if (ret != NETDEV_TX_OK) {
 448                         nes_debug(NES_DBG_CM, "Error sending packet %p "
 449                                 "(jiffies = %lu)\n", new_send, jiffies);
 450                         new_send->timetosend = jiffies;
 451                         ret = NETDEV_TX_OK;
 452                 } else {
 453                         cm_packets_sent++;
 454                         if (!send_retrans) {
 455                                 cleanup_retrans_entry(cm_node);
 456                                 if (close_when_complete)
 457                                         rem_ref_cm_node(cm_core, cm_node);
 458                                 return ret;
 459                         }
 460                 }
 461         }
 462
 463         was_timer_set = timer_pending(&cm_core->tcp_timer);
 464
 465         if (!was_timer_set) {
 466                 cm_core->tcp_timer.expires = new_send->timetosend;
 467                 add_timer(&cm_core->tcp_timer);
 468         }
 469
 470         return ret;
 471 }
 472
 473 static void nes_retrans_expired(struct nes_cm_node *cm_node)
 474 {
 475         switch (cm_node->state) {
 476         case NES_CM_STATE_SYN_RCVD:
 477         case NES_CM_STATE_CLOSING:
 478                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 479                 break;
 480         case NES_CM_STATE_LAST_ACK:
 481         case NES_CM_STATE_FIN_WAIT1:
 482         case NES_CM_STATE_MPAREJ_RCVD:
 483                 send_reset(cm_node, NULL);
 484                 break;
 485         default:
 486                 create_event(cm_node, NES_CM_EVENT_ABORTED);
 487         }
 488 }
 489
 490 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
 491 {
 492         struct nes_timer_entry *recv_entry = cm_node->recv_entry;
 493         struct iw_cm_id *cm_id = cm_node->cm_id;
 494         struct nes_qp *nesqp;
 495         unsigned long qplockflags;
 496
 497         if (!recv_entry)
 498                 return;
 499         nesqp = (struct nes_qp *)recv_entry->skb;
 500         if (nesqp) {
 501                 spin_lock_irqsave(&nesqp->lock, qplockflags);
 502                 if (nesqp->cm_id) {
 503                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 504                                 "refcount = %d: HIT A "
 505                                 "NES_TIMER_TYPE_CLOSE with something "
 506                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 507                                 atomic_read(&nesqp->refcount));
 508                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
 509                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
 510                         nesqp->ibqp_state = IB_QPS_ERR;
 511                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 512                         nes_cm_disconn(nesqp);
 513                 } else {
 514                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 515                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 516                                 "refcount = %d: HIT A "
 517                                 "NES_TIMER_TYPE_CLOSE with nothing "
 518                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 519                                 atomic_read(&nesqp->refcount));
 520                 }
 521         } else if (rem_node) {
 522                 /* TIME_WAIT state */
 523                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 524         }
 525         if (cm_node->cm_id)
 526                 cm_id->rem_ref(cm_id);
 527         kfree(recv_entry);
 528         cm_node->recv_entry = NULL;
 529 }
 530
 531 /**
 532  * nes_cm_timer_tick
 533  */
 534 static void nes_cm_timer_tick(unsigned long pass)
 535 {
 536         unsigned long flags;
 537         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
 538         struct nes_cm_node *cm_node;
 539         struct nes_timer_entry *send_entry, *recv_entry;
 540         struct list_head *list_core_temp;
 541         struct list_head *list_node;
 542         struct nes_cm_core *cm_core = g_cm_core;
 543         u32 settimer = 0;
 544         unsigned long timetosend;
 545         int ret = NETDEV_TX_OK;
 546
 547         struct list_head timer_list;
 548         INIT_LIST_HEAD(&timer_list);
 549         spin_lock_irqsave(&cm_core->ht_lock, flags);
 550
 551         list_for_each_safe(list_node, list_core_temp,
 552                                 &cm_core->connected_nodes) {
 553                 cm_node = container_of(list_node, struct nes_cm_node, list);
 554                 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
 555                         add_ref_cm_node(cm_node);
 556                         list_add(&cm_node->timer_entry, &timer_list);
 557                 }
 558         }
 559         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 560
 561         list_for_each_safe(list_node, list_core_temp, &timer_list) {
 562                 cm_node = container_of(list_node, struct nes_cm_node,
 563                                         timer_entry);
 564                 recv_entry = cm_node->recv_entry;
 565
 566                 if (recv_entry) {
 567                         if (time_after(recv_entry->timetosend, jiffies)) {
 568                                 if (nexttimeout > recv_entry->timetosend ||
 569                                                 !settimer) {
 570                                         nexttimeout = recv_entry->timetosend;
 571                                         settimer = 1;
 572                                 }
 573                         } else
 574                                 handle_recv_entry(cm_node, 1);
 575                 }
 576
 577                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 578                 do {
 579                         send_entry = cm_node->send_entry;
 580                         if (!send_entry)
 581                                 break;
 582                         if (time_after(send_entry->timetosend, jiffies)) {
 583                                 if (cm_node->state != NES_CM_STATE_TSA) {
 584                                         if ((nexttimeout >
 585                                                 send_entry->timetosend) ||
 586                                                 !settimer) {
 587                                                 nexttimeout =
 588                                                         send_entry->timetosend;
 589                                                 settimer = 1;
 590                                         }
 591                                 } else {
 592                                         free_retrans_entry(cm_node);
 593                                 }
 594                                 break;
 595                         }
 596
 597                         if ((cm_node->state == NES_CM_STATE_TSA) ||
 598                                 (cm_node->state == NES_CM_STATE_CLOSED)) {
 599                                 free_retrans_entry(cm_node);
 600                                 break;
 601                         }
 602
 603                         if (!send_entry->retranscount ||
 604                                 !send_entry->retrycount) {
 605                                 cm_packets_dropped++;
 606                                 free_retrans_entry(cm_node);
 607
 608                                 spin_unlock_irqrestore(
 609                                         &cm_node->retrans_list_lock, flags);
 610                                 nes_retrans_expired(cm_node);
 611                                 cm_node->state = NES_CM_STATE_CLOSED;
 612                                 spin_lock_irqsave(&cm_node->retrans_list_lock,
 613                                         flags);
 614                                 break;
 615                         }
 616                         atomic_inc(&send_entry->skb->users);
 617                         cm_packets_retrans++;
 618                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
 619                                 "for node %p, jiffies = %lu, time to send = "
 620                                 "%lu, retranscount = %u, send_entry->seq_num = "
 621                                 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
 622                                 "0x%08X\n", send_entry, cm_node, jiffies,
 623                                 send_entry->timetosend,
 624                                 send_entry->retranscount,
 625                                 send_entry->seq_num,
 626                                 cm_node->tcp_cntxt.rem_ack_num);
 627
 628                         spin_unlock_irqrestore(&cm_node->retrans_list_lock,
 629                                 flags);
 630                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
 631                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 632                         if (ret != NETDEV_TX_OK) {
 633                                 nes_debug(NES_DBG_CM, "rexmit failed for "
 634                                         "node=%p\n", cm_node);
 635                                 cm_packets_bounced++;
 636                                 send_entry->retrycount--;
 637                                 nexttimeout = jiffies + NES_SHORT_TIME;
 638                                 settimer = 1;
 639                                 break;
 640                         } else {
 641                                 cm_packets_sent++;
 642                         }
 643                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
 644                                 "%u, retry count = %u.\n",
 645                                 send_entry->retranscount,
 646                                 send_entry->retrycount);
 647                         if (send_entry->send_retrans) {
 648                                 send_entry->retranscount--;
 649                                 timetosend = (NES_RETRY_TIMEOUT <<
 650                                         (NES_DEFAULT_RETRANS - send_entry->retranscount));
 651
 652                                 send_entry->timetosend = jiffies +
 653                                         min(timetosend, NES_MAX_TIMEOUT);
 654                                 if (nexttimeout > send_entry->timetosend ||
 655                                         !settimer) {
 656                                         nexttimeout = send_entry->timetosend;
 657                                         settimer = 1;
 658                                 }
 659                         } else {
 660                                 int close_when_complete;
 661                                 close_when_complete =
 662                                         send_entry->close_when_complete;
 663                                 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
 664                                         cm_node, cm_node->state);
 665                                 free_retrans_entry(cm_node);
 666                                 if (close_when_complete)
 667                                         rem_ref_cm_node(cm_node->cm_core,
 668                                                 cm_node);
 669                         }
 670                 } while (0);
 671
 672                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 673                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 674         }
 675
 676         if (settimer) {
 677                 if (!timer_pending(&cm_core->tcp_timer)) {
 678                         cm_core->tcp_timer.expires  = nexttimeout;
 679                         add_timer(&cm_core->tcp_timer);
 680                 }
 681         }
 682 }
 683
 684
 685 /**
 686  * send_syn
 687  */
 688 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
 689         struct sk_buff *skb)
 690 {
 691         int ret;
 692         int flags = SET_SYN;
 693         char optionsbuffer[sizeof(struct option_mss) +
 694                 sizeof(struct option_windowscale) + sizeof(struct option_base) +
 695                 TCP_OPTIONS_PADDING];
 696
 697         int optionssize = 0;
 698         /* Sending MSS option */
 699         union all_known_options *options;
 700
 701         if (!cm_node)
 702                 return -EINVAL;
 703
 704         options = (union all_known_options *)&optionsbuffer[optionssize];
 705         options->as_mss.optionnum = OPTION_NUMBER_MSS;
 706         options->as_mss.length = sizeof(struct option_mss);
 707         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
 708         optionssize += sizeof(struct option_mss);
 709
 710         options = (union all_known_options *)&optionsbuffer[optionssize];
 711         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
 712         options->as_windowscale.length = sizeof(struct option_windowscale);
 713         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
 714         optionssize += sizeof(struct option_windowscale);
 715
 716         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
 717                 options = (union all_known_options *)&optionsbuffer[optionssize];
 718                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
 719                 options->as_base.length = sizeof(struct option_base);
 720                 optionssize += sizeof(struct option_base);
 721                 /* we need the size to be a multiple of 4 */
 722                 options = (union all_known_options *)&optionsbuffer[optionssize];
 723                 options->as_end = 1;
 724                 optionssize += 1;
 725                 options = (union all_known_options *)&optionsbuffer[optionssize];
 726                 options->as_end = 1;
 727                 optionssize += 1;
 728         }
 729
 730         options = (union all_known_options *)&optionsbuffer[optionssize];
 731         options->as_end = OPTION_NUMBER_END;
 732         optionssize += 1;
 733
 734         if (!skb)
 735                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 736         if (!skb) {
 737                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 738                 return -1;
 739         }
 740
 741         if (sendack)
 742                 flags |= SET_ACK;
 743
 744         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
 745         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 746
 747         return ret;
 748 }
 749
 750
 751 /**
 752  * send_reset
 753  */
 754 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
 755 {
 756         int ret;
 757         int flags = SET_RST | SET_ACK;
 758
 759         if (!skb)
 760                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 761         if (!skb) {
 762                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 763                 return -ENOMEM;
 764         }
 765
 766         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
 767         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
 768
 769         return ret;
 770 }
 771
 772
 773 /**
 774  * send_ack
 775  */
 776 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
 777 {
 778         int ret;
 779
 780         if (!skb)
 781                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 782
 783         if (!skb) {
 784                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 785                 return -1;
 786         }
 787
 788         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
 789         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
 790
 791         return ret;
 792 }
 793
 794
 795 /**
 796  * send_fin
 797  */
 798 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
 799 {
 800         int ret;
 801
 802         /* if we didn't get a frame get one */
 803         if (!skb)
 804                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 805
 806         if (!skb) {
 807                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 808                 return -1;
 809         }
 810
 811         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
 812         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 813
 814         return ret;
 815 }
 816
 817
 818 /**
 819  * find_node - find a cm node that matches the reference cm node
 820  */
 821 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
 822                 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
 823 {
 824         unsigned long flags;
 825         struct list_head *hte;
 826         struct nes_cm_node *cm_node;
 827
 828         /* get a handle on the hte */
 829         hte = &cm_core->connected_nodes;
 830
 831         /* walk list and find cm_node associated with this session ID */
 832         spin_lock_irqsave(&cm_core->ht_lock, flags);
 833         list_for_each_entry(cm_node, hte, list) {
 834                 /* compare quad, return node handle if a match */
 835                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
 836                                 cm_node->loc_addr, cm_node->loc_port,
 837                                 loc_addr, loc_port,
 838                                 cm_node->rem_addr, cm_node->rem_port,
 839                                 rem_addr, rem_port);
 840                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
 841                                 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
 842                         add_ref_cm_node(cm_node);
 843                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 844                         return cm_node;
 845                 }
 846         }
 847         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 848
 849         /* no owner node */
 850         return NULL;
 851 }
 852
 853
 854 /**
 855  * find_listener - find a cm node listening on this addr-port pair
 856  */
 857 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
 858                 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
 859 {
 860         unsigned long flags;
 861         struct nes_cm_listener *listen_node;
 862
 863         /* walk list and find cm_node associated with this session ID */
 864         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 865         list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
 866                 /* compare node pair, return node handle if a match */
 867                 if (((listen_node->loc_addr == dst_addr) ||
 868                                 listen_node->loc_addr == 0x00000000) &&
 869                                 (listen_node->loc_port == dst_port) &&
 870                                 (listener_state & listen_node->listener_state)) {
 871                         atomic_inc(&listen_node->ref_count);
 872                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 873                         return listen_node;
 874                 }
 875         }
 876         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 877
 878         /* no listener */
 879         return NULL;
 880 }
 881
 882
 883 /**
 884  * add_hte_node - add a cm node to the hash table
 885  */
 886 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
 887 {
 888         unsigned long flags;
 889         struct list_head *hte;
 890
 891         if (!cm_node || !cm_core)
 892                 return -EINVAL;
 893
 894         nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
 895                 cm_node);
 896
 897         spin_lock_irqsave(&cm_core->ht_lock, flags);
 898
 899         /* get a handle on the hash table element (list head for this slot) */
 900         hte = &cm_core->connected_nodes;
 901         list_add_tail(&cm_node->list, hte);
 902         atomic_inc(&cm_core->ht_node_cnt);
 903
 904         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 905
 906         return 0;
 907 }
 908
 909
 910 /**
 911  * mini_cm_dec_refcnt_listen
 912  */
 913 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
 914         struct nes_cm_listener *listener, int free_hanging_nodes)
 915 {
 916         int ret = -EINVAL;
 917         int err = 0;
 918         unsigned long flags;
 919         struct list_head *list_pos = NULL;
 920         struct list_head *list_temp = NULL;
 921         struct nes_cm_node *cm_node = NULL;
 922         struct list_head reset_list;
 923
 924         nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
 925                 "refcnt=%d\n", listener, free_hanging_nodes,
 926                 atomic_read(&listener->ref_count));
 927         /* free non-accelerated child nodes for this listener */
 928         INIT_LIST_HEAD(&reset_list);
 929         if (free_hanging_nodes) {
 930                 spin_lock_irqsave(&cm_core->ht_lock, flags);
 931                 list_for_each_safe(list_pos, list_temp,
 932                                    &g_cm_core->connected_nodes) {
 933                         cm_node = container_of(list_pos, struct nes_cm_node,
 934                                 list);
 935                         if ((cm_node->listener == listener) &&
 936                             (!cm_node->accelerated)) {
 937                                 add_ref_cm_node(cm_node);
 938                                 list_add(&cm_node->reset_entry, &reset_list);
 939                         }
 940                 }
 941                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 942         }
 943
 944         list_for_each_safe(list_pos, list_temp, &reset_list) {
 945                 cm_node = container_of(list_pos, struct nes_cm_node,
 946                                 reset_entry);
 947                 {
 948                         struct nes_cm_node *loopback = cm_node->loopbackpartner;
 949                         if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
 950                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 951                         } else {
 952                                 if (!loopback) {
 953                                         cleanup_retrans_entry(cm_node);
 954                                         err = send_reset(cm_node, NULL);
 955                                         if (err) {
 956                                                 cm_node->state =
 957                                                          NES_CM_STATE_CLOSED;
 958                                                 WARN_ON(1);
 959                                         } else {
 960                                                 cm_node->state =
 961                                                         NES_CM_STATE_CLOSED;
 962                                                 rem_ref_cm_node(
 963                                                         cm_node->cm_core,
 964                                                         cm_node);
 965                                         }
 966                                 } else {
 967                                         struct nes_cm_event event;
 968
 969                                         event.cm_node = loopback;
 970                                         event.cm_info.rem_addr =
 971                                                         loopback->rem_addr;
 972                                         event.cm_info.loc_addr =
 973                                                         loopback->loc_addr;
 974                                         event.cm_info.rem_port =
 975                                                         loopback->rem_port;
 976                                         event.cm_info.loc_port =
 977                                                          loopback->loc_port;
 978                                         event.cm_info.cm_id = loopback->cm_id;
 979                                         cm_event_connect_error(&event);
 980                                         loopback->state = NES_CM_STATE_CLOSED;
 981
 982                                         event.cm_node = cm_node;
 983                                         event.cm_info.rem_addr =
 984                                                          cm_node->rem_addr;
 985                                         event.cm_info.loc_addr =
 986                                                          cm_node->loc_addr;
 987                                         event.cm_info.rem_port =
 988                                                          cm_node->rem_port;
 989                                         event.cm_info.loc_port =
 990                                                          cm_node->loc_port;
 991                                         event.cm_info.cm_id = cm_node->cm_id;
 992                                         cm_event_reset(&event);
 993
 994                                         rem_ref_cm_node(cm_node->cm_core,
 995                                                          cm_node);
 996
 997                                 }
 998                         }
 999                 }
1000         }
1001
1002         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1003         if (!atomic_dec_return(&listener->ref_count)) {
1004                 list_del(&listener->list);
1005
1006                 /* decrement our listen node count */
1007                 atomic_dec(&cm_core->listen_node_cnt);
1008
1009                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1010
1011                 if (listener->nesvnic) {
1012                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
1013                                         PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
1014                 }
1015
1016                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1017
1018                 kfree(listener);
1019                 listener = NULL;
1020                 ret = 0;
1021                 cm_listens_destroyed++;
1022         } else {
1023                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1024         }
1025         if (listener) {
1026                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1027                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
1028                                         " with non-zero pending accepts=%u\n",
1029                                         listener, atomic_read(&listener->pend_accepts_cnt));
1030         }
1031
1032         return ret;
1033 }
1034
1035
1036 /**
1037  * mini_cm_del_listen
1038  */
1039 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1040                 struct nes_cm_listener *listener)
1041 {
1042         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1043         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1044         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1045 }
1046
1047
1048 /**
1049  * mini_cm_accelerated
1050  */
1051 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1052                 struct nes_cm_node *cm_node)
1053 {
1054         u32 was_timer_set;
1055         cm_node->accelerated = 1;
1056
1057         if (cm_node->accept_pend) {
1058                 BUG_ON(!cm_node->listener);
1059                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1060                 cm_node->accept_pend = 0;
1061                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1062         }
1063
1064         was_timer_set = timer_pending(&cm_core->tcp_timer);
1065         if (!was_timer_set) {
1066                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1067                 add_timer(&cm_core->tcp_timer);
1068         }
1069
1070         return 0;
1071 }
1072
1073
1074 /**
1075  * nes_addr_resolve_neigh
1076  */
1077 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
1078 {
1079         struct rtable *rt;
1080         struct flowi fl;
1081         struct neighbour *neigh;
1082         int rc = -1;
1083
1084         memset(&fl, 0, sizeof fl);
1085         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1086         if (ip_route_output_key(&init_net, &rt, &fl)) {
1087                 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1088                                 __func__, dst_ip);
1089                 return rc;
1090         }
1091
1092         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, nesvnic->netdev);
1093         if (neigh) {
1094                 if (neigh->nud_state & NUD_VALID) {
1095                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1096                                   " is %pM, Gateway is 0x%08X \n", dst_ip,
1097                                   neigh->ha, ntohl(rt->rt_gateway));
1098                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1099                                              dst_ip, NES_ARP_ADD);
1100                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1101                                            NES_ARP_RESOLVE);
1102                 }
1103                 neigh_release(neigh);
1104         }
1105
1106         if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
1107                 neigh_event_send(rt->u.dst.neighbour, NULL);
1108
1109         ip_rt_put(rt);
1110         return rc;
1111 }
1112
1113
1114 /**
1115  * make_cm_node - create a new instance of a cm node
1116  */
1117 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1118                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1119                 struct nes_cm_listener *listener)
1120 {
1121         struct nes_cm_node *cm_node;
1122         struct timespec ts;
1123         int arpindex = 0;
1124         struct nes_device *nesdev;
1125         struct nes_adapter *nesadapter;
1126
1127         /* create an hte and cm_node for this instance */
1128         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1129         if (!cm_node)
1130                 return NULL;
1131
1132         /* set our node specific transport info */
1133         cm_node->loc_addr = cm_info->loc_addr;
1134         cm_node->rem_addr = cm_info->rem_addr;
1135         cm_node->loc_port = cm_info->loc_port;
1136         cm_node->rem_port = cm_info->rem_port;
1137         cm_node->send_write0 = send_first;
1138         nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1139                   &cm_node->loc_addr, cm_node->loc_port,
1140                   &cm_node->rem_addr, cm_node->rem_port);
1141         cm_node->listener = listener;
1142         cm_node->netdev = nesvnic->netdev;
1143         cm_node->cm_id = cm_info->cm_id;
1144         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1145
1146         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1147                         cm_node->cm_id);
1148
1149         spin_lock_init(&cm_node->retrans_list_lock);
1150
1151         cm_node->loopbackpartner = NULL;
1152         atomic_set(&cm_node->ref_count, 1);
1153         /* associate our parent CM core */
1154         cm_node->cm_core = cm_core;
1155         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1156         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1157         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1158                         NES_CM_DEFAULT_RCV_WND_SCALE;
1159         ts = current_kernel_time();
1160         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1161         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1162                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1163         cm_node->tcp_cntxt.rcv_nxt = 0;
1164         /* get a unique session ID , add thread_id to an upcounter to handle race */
1165         atomic_inc(&cm_core->node_cnt);
1166         cm_node->conn_type = cm_info->conn_type;
1167         cm_node->apbvt_set = 0;
1168         cm_node->accept_pend = 0;
1169
1170         cm_node->nesvnic = nesvnic;
1171         /* get some device handles, for arp lookup */
1172         nesdev = nesvnic->nesdev;
1173         nesadapter = nesdev->nesadapter;
1174
1175         cm_node->loopbackpartner = NULL;
1176         /* get the mac addr for the remote node */
1177         if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
1178                 arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1179         else
1180                 arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1181         if (arpindex < 0) {
1182                 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr);
1183                 if (arpindex < 0) {
1184                         kfree(cm_node);
1185                         return NULL;
1186                 }
1187         }
1188
1189         /* copy the mac addr to node context */
1190         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1191         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1192                   cm_node->rem_mac);
1193
1194         add_hte_node(cm_core, cm_node);
1195         atomic_inc(&cm_nodes_created);
1196
1197         return cm_node;
1198 }
1199
1200
1201 /**
1202  * add_ref_cm_node - destroy an instance of a cm node
1203  */
1204 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1205 {
1206         atomic_inc(&cm_node->ref_count);
1207         return 0;
1208 }
1209
1210
1211 /**
1212  * rem_ref_cm_node - destroy an instance of a cm node
1213  */
1214 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1215         struct nes_cm_node *cm_node)
1216 {
1217         unsigned long flags;
1218         struct nes_qp *nesqp;
1219
1220         if (!cm_node)
1221                 return -EINVAL;
1222
1223         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1224         if (atomic_dec_return(&cm_node->ref_count)) {
1225                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1226                 return 0;
1227         }
1228         list_del(&cm_node->list);
1229         atomic_dec(&cm_core->ht_node_cnt);
1230         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1231
1232         /* if the node is destroyed before connection was accelerated */
1233         if (!cm_node->accelerated && cm_node->accept_pend) {
1234                 BUG_ON(!cm_node->listener);
1235                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1236                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1237         }
1238         WARN_ON(cm_node->send_entry);
1239         if (cm_node->recv_entry)
1240                 handle_recv_entry(cm_node, 0);
1241         if (cm_node->listener) {
1242                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1243         } else {
1244                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1245                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1246                                 PCI_FUNC(
1247                                 cm_node->nesvnic->nesdev->pcidev->devfn),
1248                                 NES_MANAGE_APBVT_DEL);
1249                 }
1250         }
1251
1252         atomic_dec(&cm_core->node_cnt);
1253         atomic_inc(&cm_nodes_destroyed);
1254         nesqp = cm_node->nesqp;
1255         if (nesqp) {
1256                 nesqp->cm_node = NULL;
1257                 nes_rem_ref(&nesqp->ibqp);
1258                 cm_node->nesqp = NULL;
1259         }
1260
1261         kfree(cm_node);
1262         return 0;
1263 }
1264
1265 /**
1266  * process_options
1267  */
1268 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1269         u32 optionsize, u32 syn_packet)
1270 {
1271         u32 tmp;
1272         u32 offset = 0;
1273         union all_known_options *all_options;
1274         char got_mss_option = 0;
1275
1276         while (offset < optionsize) {
1277                 all_options = (union all_known_options *)(optionsloc + offset);
1278                 switch (all_options->as_base.optionnum) {
1279                 case OPTION_NUMBER_END:
1280                         offset = optionsize;
1281                         break;
1282                 case OPTION_NUMBER_NONE:
1283                         offset += 1;
1284                         continue;
1285                 case OPTION_NUMBER_MSS:
1286                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1287                                 "Size: %d\n", __func__,
1288                                 all_options->as_mss.length, offset, optionsize);
1289                         got_mss_option = 1;
1290                         if (all_options->as_mss.length != 4) {
1291                                 return 1;
1292                         } else {
1293                                 tmp = ntohs(all_options->as_mss.mss);
1294                                 if (tmp > 0 && tmp <
1295                                         cm_node->tcp_cntxt.mss)
1296                                         cm_node->tcp_cntxt.mss = tmp;
1297                         }
1298                         break;
1299                 case OPTION_NUMBER_WINDOW_SCALE:
1300                         cm_node->tcp_cntxt.snd_wscale =
1301                                 all_options->as_windowscale.shiftcount;
1302                         break;
1303                 case OPTION_NUMBER_WRITE0:
1304                         cm_node->send_write0 = 1;
1305                         break;
1306                 default:
1307                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1308                                 all_options->as_base.optionnum);
1309                         break;
1310                 }
1311                 offset += all_options->as_base.length;
1312         }
1313         if ((!got_mss_option) && (syn_packet))
1314                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1315         return 0;
1316 }
1317
1318 static void drop_packet(struct sk_buff *skb)
1319 {
1320         atomic_inc(&cm_accel_dropped_pkts);
1321         dev_kfree_skb_any(skb);
1322 }
1323
1324 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1325 {
1326         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1327                 "refcnt=%d\n", cm_node, cm_node->state,
1328                 atomic_read(&cm_node->ref_count));
1329         switch (cm_node->state) {
1330         case NES_CM_STATE_SYN_RCVD:
1331         case NES_CM_STATE_SYN_SENT:
1332         case NES_CM_STATE_ESTABLISHED:
1333         case NES_CM_STATE_MPAREQ_SENT:
1334         case NES_CM_STATE_MPAREJ_RCVD:
1335                 cm_node->tcp_cntxt.rcv_nxt++;
1336                 cleanup_retrans_entry(cm_node);
1337                 cm_node->state = NES_CM_STATE_LAST_ACK;
1338                 send_fin(cm_node, NULL);
1339                 break;
1340         case NES_CM_STATE_FIN_WAIT1:
1341                 cm_node->tcp_cntxt.rcv_nxt++;
1342                 cleanup_retrans_entry(cm_node);
1343                 cm_node->state = NES_CM_STATE_CLOSING;
1344                 send_ack(cm_node, NULL);
1345                 /* Wait for ACK as this is simultanous close..
1346                 * After we receive ACK, do not send anything..
1347                 * Just rm the node.. Done.. */
1348                 break;
1349         case NES_CM_STATE_FIN_WAIT2:
1350                 cm_node->tcp_cntxt.rcv_nxt++;
1351                 cleanup_retrans_entry(cm_node);
1352                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1353                 send_ack(cm_node, NULL);
1354                 schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
1355                 break;
1356         case NES_CM_STATE_TIME_WAIT:
1357                 cm_node->tcp_cntxt.rcv_nxt++;
1358                 cleanup_retrans_entry(cm_node);
1359                 cm_node->state = NES_CM_STATE_CLOSED;
1360                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1361                 break;
1362         case NES_CM_STATE_TSA:
1363         default:
1364                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1365                         cm_node, cm_node->state);
1366                 break;
1367         }
1368 }
1369
1370
1371 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1372         struct tcphdr *tcph)
1373 {
1374
1375         int     reset = 0;      /* whether to send reset in case of err.. */
1376         int     passive_state;
1377         atomic_inc(&cm_resets_recvd);
1378         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1379                         " refcnt=%d\n", cm_node, cm_node->state,
1380                         atomic_read(&cm_node->ref_count));
1381         cleanup_retrans_entry(cm_node);
1382         switch (cm_node->state) {
1383         case NES_CM_STATE_SYN_SENT:
1384         case NES_CM_STATE_MPAREQ_SENT:
1385                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1386                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1387                         cm_node->listener, cm_node->state);
1388                 active_open_err(cm_node, skb, reset);
1389                 break;
1390         case NES_CM_STATE_MPAREQ_RCVD:
1391                 passive_state = atomic_add_return(1, &cm_node->passive_state);
1392                 if (passive_state ==  NES_SEND_RESET_EVENT)
1393                         create_event(cm_node, NES_CM_EVENT_RESET);
1394                 cm_node->state = NES_CM_STATE_CLOSED;
1395                 dev_kfree_skb_any(skb);
1396                 break;
1397         case NES_CM_STATE_ESTABLISHED:
1398         case NES_CM_STATE_SYN_RCVD:
1399         case NES_CM_STATE_LISTENING:
1400                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1401                 passive_open_err(cm_node, skb, reset);
1402                 break;
1403         case NES_CM_STATE_TSA:
1404                 active_open_err(cm_node, skb, reset);
1405                 break;
1406         case NES_CM_STATE_CLOSED:
1407                 drop_packet(skb);
1408                 break;
1409         case NES_CM_STATE_LAST_ACK:
1410                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1411         case NES_CM_STATE_TIME_WAIT:
1412                 cm_node->state = NES_CM_STATE_CLOSED;
1413                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1414                 drop_packet(skb);
1415                 break;
1416         case NES_CM_STATE_FIN_WAIT1:
1417                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1418         default:
1419                 drop_packet(skb);
1420                 break;
1421         }
1422 }
1423
1424
1425 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1426 {
1427
1428         int     ret = 0;
1429         int datasize = skb->len;
1430         u8 *dataloc = skb->data;
1431
1432         enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1433         u32     res_type;
1434         ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1435         if (ret) {
1436                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1437                 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1438                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1439                                 "cm_node=%p listener=%p state=%d\n", __func__,
1440                                 __LINE__, cm_node, cm_node->listener,
1441                                 cm_node->state);
1442                         active_open_err(cm_node, skb, 1);
1443                 } else {
1444                         passive_open_err(cm_node, skb, 1);
1445                 }
1446                 return;
1447         }
1448
1449         switch (cm_node->state) {
1450         case NES_CM_STATE_ESTABLISHED:
1451                 if (res_type == NES_MPA_REQUEST_REJECT) {
1452                         /*BIG problem as we are receiving the MPA.. So should
1453                         * not be REJECT.. This is Passive Open.. We can
1454                         * only receive it Reject for Active Open...*/
1455                         WARN_ON(1);
1456                 }
1457                 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1458                 type = NES_CM_EVENT_MPA_REQ;
1459                 atomic_set(&cm_node->passive_state,
1460                                 NES_PASSIVE_STATE_INDICATED);
1461                 break;
1462         case NES_CM_STATE_MPAREQ_SENT:
1463                 cleanup_retrans_entry(cm_node);
1464                 if (res_type == NES_MPA_REQUEST_REJECT) {
1465                         type = NES_CM_EVENT_MPA_REJECT;
1466                         cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1467                 } else {
1468                         type = NES_CM_EVENT_CONNECTED;
1469                         cm_node->state = NES_CM_STATE_TSA;
1470                 }
1471
1472                 break;
1473         default:
1474                 WARN_ON(1);
1475                 break;
1476         }
1477         dev_kfree_skb_any(skb);
1478         create_event(cm_node, type);
1479 }
1480
1481 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1482 {
1483         switch (cm_node->state) {
1484         case NES_CM_STATE_SYN_SENT:
1485         case NES_CM_STATE_MPAREQ_SENT:
1486                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1487                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1488                         cm_node->listener, cm_node->state);
1489                 active_open_err(cm_node, skb, 1);
1490                 break;
1491         case NES_CM_STATE_ESTABLISHED:
1492         case NES_CM_STATE_SYN_RCVD:
1493                 passive_open_err(cm_node, skb, 1);
1494                 break;
1495         case NES_CM_STATE_TSA:
1496         default:
1497                 drop_packet(skb);
1498         }
1499 }
1500
1501 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1502         struct sk_buff *skb)
1503 {
1504         int err;
1505
1506         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1507         if (err)
1508                 active_open_err(cm_node, skb, 1);
1509
1510         return err;
1511 }
1512
1513 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1514         struct sk_buff *skb)
1515 {
1516         int err = 0;
1517         u32 seq;
1518         u32 ack_seq;
1519         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1520         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1521         u32 rcv_wnd;
1522         seq = ntohl(tcph->seq);
1523         ack_seq = ntohl(tcph->ack_seq);
1524         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1525         if (ack_seq != loc_seq_num)
1526                 err = 1;
1527         else if (!between(seq, rcv_nxt, (rcv_nxt+rcv_wnd)))
1528                 err = 1;
1529         if (err) {
1530                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1531                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1532                         cm_node->listener, cm_node->state);
1533                 indicate_pkt_err(cm_node, skb);
1534                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1535                         "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1536                         rcv_wnd);
1537         }
1538         return err;
1539 }
1540
1541 /*
1542  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1543  * is created with a listener or it may comein as rexmitted packet which in
1544  * that case will be just dropped.
1545  */
1546
1547 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1548         struct tcphdr *tcph)
1549 {
1550         int ret;
1551         u32 inc_sequence;
1552         int optionsize;
1553
1554         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1555         skb_trim(skb, 0);
1556         inc_sequence = ntohl(tcph->seq);
1557
1558         switch (cm_node->state) {
1559         case NES_CM_STATE_SYN_SENT:
1560         case NES_CM_STATE_MPAREQ_SENT:
1561                 /* Rcvd syn on active open connection*/
1562                 active_open_err(cm_node, skb, 1);
1563                 break;
1564         case NES_CM_STATE_LISTENING:
1565                 /* Passive OPEN */
1566                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1567                                 cm_node->listener->backlog) {
1568                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1569                                 "pressure \n");
1570                         cm_backlog_drops++;
1571                         passive_open_err(cm_node, skb, 0);
1572                         break;
1573                 }
1574                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1575                         1);
1576                 if (ret) {
1577                         passive_open_err(cm_node, skb, 0);
1578                         /* drop pkt */
1579                         break;
1580                 }
1581                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1582                 BUG_ON(cm_node->send_entry);
1583                 cm_node->accept_pend = 1;
1584                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1585
1586                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1587                 send_syn(cm_node, 1, skb);
1588                 break;
1589         case NES_CM_STATE_CLOSED:
1590                 cleanup_retrans_entry(cm_node);
1591                 send_reset(cm_node, skb);
1592                 break;
1593         case NES_CM_STATE_TSA:
1594         case NES_CM_STATE_ESTABLISHED:
1595         case NES_CM_STATE_FIN_WAIT1:
1596         case NES_CM_STATE_FIN_WAIT2:
1597         case NES_CM_STATE_MPAREQ_RCVD:
1598         case NES_CM_STATE_LAST_ACK:
1599         case NES_CM_STATE_CLOSING:
1600         case NES_CM_STATE_UNKNOWN:
1601         default:
1602                 drop_packet(skb);
1603                 break;
1604         }
1605 }
1606
1607 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1608         struct tcphdr *tcph)
1609 {
1610
1611         int ret;
1612         u32 inc_sequence;
1613         int optionsize;
1614
1615         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1616         skb_trim(skb, 0);
1617         inc_sequence = ntohl(tcph->seq);
1618         switch (cm_node->state) {
1619         case NES_CM_STATE_SYN_SENT:
1620                 cleanup_retrans_entry(cm_node);
1621                 /* active open */
1622                 if (check_syn(cm_node, tcph, skb))
1623                         return;
1624                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1625                 /* setup options */
1626                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1627                 if (ret) {
1628                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1629                                 cm_node);
1630                         break;
1631                 }
1632                 cleanup_retrans_entry(cm_node);
1633                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1634                 send_mpa_request(cm_node, skb);
1635                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1636                 break;
1637         case NES_CM_STATE_MPAREQ_RCVD:
1638                 /* passive open, so should not be here */
1639                 passive_open_err(cm_node, skb, 1);
1640                 break;
1641         case NES_CM_STATE_LISTENING:
1642         case NES_CM_STATE_CLOSED:
1643                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1644                 cleanup_retrans_entry(cm_node);
1645                 send_reset(cm_node, skb);
1646                 break;
1647         case NES_CM_STATE_ESTABLISHED:
1648         case NES_CM_STATE_FIN_WAIT1:
1649         case NES_CM_STATE_FIN_WAIT2:
1650         case NES_CM_STATE_LAST_ACK:
1651         case NES_CM_STATE_TSA:
1652         case NES_CM_STATE_CLOSING:
1653         case NES_CM_STATE_UNKNOWN:
1654         case NES_CM_STATE_MPAREQ_SENT:
1655         default:
1656                 drop_packet(skb);
1657                 break;
1658         }
1659 }
1660
1661 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1662         struct tcphdr *tcph)
1663 {
1664         int datasize = 0;
1665         u32 inc_sequence;
1666         u32 rem_seq_ack;
1667         u32 rem_seq;
1668         int ret = 0;
1669         int optionsize;
1670         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1671
1672         if (check_seq(cm_node, tcph, skb))
1673                 return -EINVAL;
1674
1675         skb_pull(skb, tcph->doff << 2);
1676         inc_sequence = ntohl(tcph->seq);
1677         rem_seq = ntohl(tcph->seq);
1678         rem_seq_ack =  ntohl(tcph->ack_seq);
1679         datasize = skb->len;
1680         switch (cm_node->state) {
1681         case NES_CM_STATE_SYN_RCVD:
1682                 /* Passive OPEN */
1683                 cleanup_retrans_entry(cm_node);
1684                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1685                 if (ret)
1686                         break;
1687                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1688                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1689                 if (datasize) {
1690                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1691                         handle_rcv_mpa(cm_node, skb);
1692                 } else  /* rcvd ACK only */
1693                         dev_kfree_skb_any(skb);
1694                 break;
1695         case NES_CM_STATE_ESTABLISHED:
1696                 /* Passive OPEN */
1697                 cleanup_retrans_entry(cm_node);
1698                 if (datasize) {
1699                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1700                         handle_rcv_mpa(cm_node, skb);
1701                 } else
1702                         drop_packet(skb);
1703                 break;
1704         case NES_CM_STATE_MPAREQ_SENT:
1705                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1706                 if (datasize) {
1707                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1708                         handle_rcv_mpa(cm_node, skb);
1709                 } else  /* Could be just an ack pkt.. */
1710                         dev_kfree_skb_any(skb);
1711                 break;
1712         case NES_CM_STATE_LISTENING:
1713         case NES_CM_STATE_CLOSED:
1714                 cleanup_retrans_entry(cm_node);
1715                 send_reset(cm_node, skb);
1716                 break;
1717         case NES_CM_STATE_LAST_ACK:
1718         case NES_CM_STATE_CLOSING:
1719                 cleanup_retrans_entry(cm_node);
1720                 cm_node->state = NES_CM_STATE_CLOSED;
1721                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1722                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1723                 drop_packet(skb);
1724                 break;
1725         case NES_CM_STATE_FIN_WAIT1:
1726                 cleanup_retrans_entry(cm_node);
1727                 drop_packet(skb);
1728                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1729                 break;
1730         case NES_CM_STATE_SYN_SENT:
1731         case NES_CM_STATE_FIN_WAIT2:
1732         case NES_CM_STATE_TSA:
1733         case NES_CM_STATE_MPAREQ_RCVD:
1734         case NES_CM_STATE_UNKNOWN:
1735         default:
1736                 cleanup_retrans_entry(cm_node);
1737                 drop_packet(skb);
1738                 break;
1739         }
1740         return ret;
1741 }
1742
1743
1744
1745 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1746         struct sk_buff *skb, int optionsize, int passive)
1747 {
1748         u8 *optionsloc = (u8 *)&tcph[1];
1749         if (optionsize) {
1750                 if (process_options(cm_node, optionsloc, optionsize,
1751                         (u32)tcph->syn)) {
1752                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
1753                                 __func__, cm_node);
1754                         if (passive)
1755                                 passive_open_err(cm_node, skb, 1);
1756                         else
1757                                 active_open_err(cm_node, skb, 1);
1758                         return 1;
1759                 }
1760         }
1761
1762         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1763                         cm_node->tcp_cntxt.snd_wscale;
1764
1765         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1766                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1767         return 0;
1768 }
1769
1770 /*
1771  * active_open_err() will send reset() if flag set..
1772  * It will also send ABORT event.
1773  */
1774
1775 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1776         int reset)
1777 {
1778         cleanup_retrans_entry(cm_node);
1779         if (reset) {
1780                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
1781                                 "state=%d\n", cm_node, cm_node->state);
1782                 add_ref_cm_node(cm_node);
1783                 send_reset(cm_node, skb);
1784         } else
1785                 dev_kfree_skb_any(skb);
1786
1787         cm_node->state = NES_CM_STATE_CLOSED;
1788         create_event(cm_node, NES_CM_EVENT_ABORTED);
1789 }
1790
1791 /*
1792  * passive_open_err() will either do a reset() or will free up the skb and
1793  * remove the cm_node.
1794  */
1795
1796 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1797         int reset)
1798 {
1799         cleanup_retrans_entry(cm_node);
1800         cm_node->state = NES_CM_STATE_CLOSED;
1801         if (reset) {
1802                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
1803                         "cm_node=%p state =%d\n", cm_node, cm_node->state);
1804                 send_reset(cm_node, skb);
1805         } else {
1806                 dev_kfree_skb_any(skb);
1807                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1808         }
1809 }
1810
1811 /*
1812  * free_retrans_entry() routines assumes that the retrans_list_lock has
1813  * been acquired before calling.
1814  */
1815 static void free_retrans_entry(struct nes_cm_node *cm_node)
1816 {
1817         struct nes_timer_entry *send_entry;
1818         send_entry = cm_node->send_entry;
1819         if (send_entry) {
1820                 cm_node->send_entry = NULL;
1821                 dev_kfree_skb_any(send_entry->skb);
1822                 kfree(send_entry);
1823                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1824         }
1825 }
1826
1827 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
1828 {
1829         unsigned long flags;
1830
1831         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1832         free_retrans_entry(cm_node);
1833         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1834 }
1835
1836 /**
1837  * process_packet
1838  * Returns skb if to be freed, else it will return NULL if already used..
1839  */
1840 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1841         struct nes_cm_core *cm_core)
1842 {
1843         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
1844         struct tcphdr *tcph = tcp_hdr(skb);
1845         u32     fin_set = 0;
1846         int ret = 0;
1847         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1848
1849         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1850                 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1851                 tcph->ack, tcph->rst, tcph->fin);
1852
1853         if (tcph->rst)
1854                 pkt_type = NES_PKT_TYPE_RST;
1855         else if (tcph->syn) {
1856                 pkt_type = NES_PKT_TYPE_SYN;
1857                 if (tcph->ack)
1858                         pkt_type = NES_PKT_TYPE_SYNACK;
1859         } else if (tcph->ack)
1860                 pkt_type = NES_PKT_TYPE_ACK;
1861         if (tcph->fin)
1862                 fin_set = 1;
1863
1864         switch (pkt_type) {
1865         case NES_PKT_TYPE_SYN:
1866                 handle_syn_pkt(cm_node, skb, tcph);
1867                 break;
1868         case NES_PKT_TYPE_SYNACK:
1869                 handle_synack_pkt(cm_node, skb, tcph);
1870                 break;
1871         case NES_PKT_TYPE_ACK:
1872                 ret = handle_ack_pkt(cm_node, skb, tcph);
1873                 if (fin_set && !ret)
1874                         handle_fin_pkt(cm_node);
1875                 break;
1876         case NES_PKT_TYPE_RST:
1877                 handle_rst_pkt(cm_node, skb, tcph);
1878                 break;
1879         default:
1880                 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
1881                         handle_fin_pkt(cm_node);
1882                 drop_packet(skb);
1883                 break;
1884         }
1885 }
1886
1887 /**
1888  * mini_cm_listen - create a listen node with params
1889  */
1890 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1891         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1892 {
1893         struct nes_cm_listener *listener;
1894         unsigned long flags;
1895
1896         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1897                 cm_info->loc_addr, cm_info->loc_port);
1898
1899         /* cannot have multiple matching listeners */
1900         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1901                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1902         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1903                 /* find automatically incs ref count ??? */
1904                 atomic_dec(&listener->ref_count);
1905                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1906                 return NULL;
1907         }
1908
1909         if (!listener) {
1910                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1911                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1912                 if (!listener) {
1913                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1914                         return NULL;
1915                 }
1916
1917                 listener->loc_addr = htonl(cm_info->loc_addr);
1918                 listener->loc_port = htons(cm_info->loc_port);
1919                 listener->reused_node = 0;
1920
1921                 atomic_set(&listener->ref_count, 1);
1922         }
1923         /* pasive case */
1924         /* find already inc'ed the ref count */
1925         else {
1926                 listener->reused_node = 1;
1927         }
1928
1929         listener->cm_id = cm_info->cm_id;
1930         atomic_set(&listener->pend_accepts_cnt, 0);
1931         listener->cm_core = cm_core;
1932         listener->nesvnic = nesvnic;
1933         atomic_inc(&cm_core->node_cnt);
1934
1935         listener->conn_type = cm_info->conn_type;
1936         listener->backlog = cm_info->backlog;
1937         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1938
1939         if (!listener->reused_node) {
1940                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1941                 list_add(&listener->list, &cm_core->listen_list.list);
1942                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1943                 atomic_inc(&cm_core->listen_node_cnt);
1944         }
1945
1946         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
1947                         " listener = %p, backlog = %d, cm_id = %p.\n",
1948                         cm_info->loc_addr, cm_info->loc_port,
1949                         listener, listener->backlog, listener->cm_id);
1950
1951         return listener;
1952 }
1953
1954
1955 /**
1956  * mini_cm_connect - make a connection node with params
1957  */
1958 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1959         struct nes_vnic *nesvnic, u16 private_data_len,
1960         void *private_data, struct nes_cm_info *cm_info)
1961 {
1962         int ret = 0;
1963         struct nes_cm_node *cm_node;
1964         struct nes_cm_listener *loopbackremotelistener;
1965         struct nes_cm_node *loopbackremotenode;
1966         struct nes_cm_info loopback_cm_info;
1967         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
1968         struct ietf_mpa_frame *mpa_frame = NULL;
1969
1970         /* create a CM connection node */
1971         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
1972         if (!cm_node)
1973                 return NULL;
1974         mpa_frame = &cm_node->mpa_frame;
1975         strcpy(mpa_frame->key, IEFT_MPA_KEY_REQ);
1976         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
1977         mpa_frame->rev =  IETF_MPA_VERSION;
1978         mpa_frame->priv_data_len = htons(private_data_len);
1979
1980         /* set our node side to client (active) side */
1981         cm_node->tcp_cntxt.client = 1;
1982         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1983
1984         if (cm_info->loc_addr == cm_info->rem_addr) {
1985                 loopbackremotelistener = find_listener(cm_core,
1986                                 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
1987                                 NES_CM_LISTENER_ACTIVE_STATE);
1988                 if (loopbackremotelistener == NULL) {
1989                         create_event(cm_node, NES_CM_EVENT_ABORTED);
1990                 } else {
1991                         loopback_cm_info = *cm_info;
1992                         loopback_cm_info.loc_port = cm_info->rem_port;
1993                         loopback_cm_info.rem_port = cm_info->loc_port;
1994                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
1995                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
1996                                 &loopback_cm_info, loopbackremotelistener);
1997                         if (!loopbackremotenode) {
1998                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1999                                 return NULL;
2000                         }
2001                         atomic_inc(&cm_loopbacks);
2002                         loopbackremotenode->loopbackpartner = cm_node;
2003                         loopbackremotenode->tcp_cntxt.rcv_wscale =
2004                                 NES_CM_DEFAULT_RCV_WND_SCALE;
2005                         cm_node->loopbackpartner = loopbackremotenode;
2006                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2007                                 private_data_len);
2008                         loopbackremotenode->mpa_frame_size = private_data_len;
2009
2010                         /* we are done handling this state. */
2011                         /* set node to a TSA state */
2012                         cm_node->state = NES_CM_STATE_TSA;
2013                         cm_node->tcp_cntxt.rcv_nxt =
2014                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
2015                         loopbackremotenode->tcp_cntxt.rcv_nxt =
2016                                 cm_node->tcp_cntxt.loc_seq_num;
2017                         cm_node->tcp_cntxt.max_snd_wnd =
2018                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2019                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
2020                                 cm_node->tcp_cntxt.rcv_wnd;
2021                         cm_node->tcp_cntxt.snd_wnd =
2022                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2023                         loopbackremotenode->tcp_cntxt.snd_wnd =
2024                                 cm_node->tcp_cntxt.rcv_wnd;
2025                         cm_node->tcp_cntxt.snd_wscale =
2026                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
2027                         loopbackremotenode->tcp_cntxt.snd_wscale =
2028                                 cm_node->tcp_cntxt.rcv_wscale;
2029                         loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2030                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2031                 }
2032                 return cm_node;
2033         }
2034
2035         /* set our node side to client (active) side */
2036         cm_node->tcp_cntxt.client = 1;
2037         /* init our MPA frame ptr */
2038         memcpy(mpa_frame->priv_data, private_data, private_data_len);
2039
2040         cm_node->mpa_frame_size = mpa_frame_size;
2041
2042         /* send a syn and goto syn sent state */
2043         cm_node->state = NES_CM_STATE_SYN_SENT;
2044         ret = send_syn(cm_node, 0, NULL);
2045
2046         if (ret) {
2047                 /* error in sending the syn free up the cm_node struct */
2048                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2049                         "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2050                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2051                         cm_node->cm_id);
2052                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2053                 cm_node = NULL;
2054         }
2055
2056         if (cm_node)
2057                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2058                         "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2059                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2060                         cm_node->cm_id);
2061
2062         return cm_node;
2063 }
2064
2065
2066 /**
2067  * mini_cm_accept - accept a connection
2068  * This function is never called
2069  */
2070 static int mini_cm_accept(struct nes_cm_core *cm_core,
2071         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2072 {
2073         return 0;
2074 }
2075
2076
2077 /**
2078  * mini_cm_reject - reject and teardown a connection
2079  */
2080 static int mini_cm_reject(struct nes_cm_core *cm_core,
2081         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2082 {
2083         int ret = 0;
2084         int err = 0;
2085         int passive_state;
2086         struct nes_cm_event event;
2087         struct iw_cm_id *cm_id = cm_node->cm_id;
2088         struct nes_cm_node *loopback = cm_node->loopbackpartner;
2089
2090         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2091                 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2092
2093         if (cm_node->tcp_cntxt.client)
2094                 return ret;
2095         cleanup_retrans_entry(cm_node);
2096
2097         if (!loopback) {
2098                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2099                 if (passive_state == NES_SEND_RESET_EVENT) {
2100                         cm_node->state = NES_CM_STATE_CLOSED;
2101                         rem_ref_cm_node(cm_core, cm_node);
2102                 } else {
2103                         ret = send_mpa_reject(cm_node);
2104                         if (ret) {
2105                                 cm_node->state = NES_CM_STATE_CLOSED;
2106                                 err = send_reset(cm_node, NULL);
2107                                 if (err)
2108                                         WARN_ON(1);
2109                         } else
2110                                 cm_id->add_ref(cm_id);
2111                 }
2112         } else {
2113                 cm_node->cm_id = NULL;
2114                 event.cm_node = loopback;
2115                 event.cm_info.rem_addr = loopback->rem_addr;
2116                 event.cm_info.loc_addr = loopback->loc_addr;
2117                 event.cm_info.rem_port = loopback->rem_port;
2118                 event.cm_info.loc_port = loopback->loc_port;
2119                 event.cm_info.cm_id = loopback->cm_id;
2120                 cm_event_mpa_reject(&event);
2121                 rem_ref_cm_node(cm_core, cm_node);
2122                 loopback->state = NES_CM_STATE_CLOSING;
2123
2124                 cm_id = loopback->cm_id;
2125                 rem_ref_cm_node(cm_core, loopback);
2126                 cm_id->rem_ref(cm_id);
2127         }
2128
2129         return ret;
2130 }
2131
2132
2133 /**
2134  * mini_cm_close
2135  */
2136 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2137 {
2138         int ret = 0;
2139
2140         if (!cm_core || !cm_node)
2141                 return -EINVAL;
2142
2143         switch (cm_node->state) {
2144         case NES_CM_STATE_SYN_RCVD:
2145         case NES_CM_STATE_SYN_SENT:
2146         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2147         case NES_CM_STATE_ESTABLISHED:
2148         case NES_CM_STATE_ACCEPTING:
2149         case NES_CM_STATE_MPAREQ_SENT:
2150         case NES_CM_STATE_MPAREQ_RCVD:
2151                 cleanup_retrans_entry(cm_node);
2152                 send_reset(cm_node, NULL);
2153                 break;
2154         case NES_CM_STATE_CLOSE_WAIT:
2155                 cm_node->state = NES_CM_STATE_LAST_ACK;
2156                 send_fin(cm_node, NULL);
2157                 break;
2158         case NES_CM_STATE_FIN_WAIT1:
2159         case NES_CM_STATE_FIN_WAIT2:
2160         case NES_CM_STATE_LAST_ACK:
2161         case NES_CM_STATE_TIME_WAIT:
2162         case NES_CM_STATE_CLOSING:
2163                 ret = -1;
2164                 break;
2165         case NES_CM_STATE_MPAREJ_RCVD:
2166         case NES_CM_STATE_LISTENING:
2167         case NES_CM_STATE_UNKNOWN:
2168         case NES_CM_STATE_INITED:
2169         case NES_CM_STATE_CLOSED:
2170                 ret = rem_ref_cm_node(cm_core, cm_node);
2171                 break;
2172         case NES_CM_STATE_TSA:
2173                 if (cm_node->send_entry)
2174                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2175                                 "send_entry=%p\n", cm_node->send_entry);
2176                 ret = rem_ref_cm_node(cm_core, cm_node);
2177                 break;
2178         }
2179         return ret;
2180 }
2181
2182
2183 /**
2184  * recv_pkt - recv an ETHERNET packet, and process it through CM
2185  * node state machine
2186  */
2187 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2188         struct nes_vnic *nesvnic, struct sk_buff *skb)
2189 {
2190         struct nes_cm_node *cm_node = NULL;
2191         struct nes_cm_listener *listener = NULL;
2192         struct iphdr *iph;
2193         struct tcphdr *tcph;
2194         struct nes_cm_info nfo;
2195         int skb_handled = 1;
2196         __be32 tmp_daddr, tmp_saddr;
2197
2198         if (!skb)
2199                 return 0;
2200         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2201                 return 0;
2202         }
2203
2204         iph = (struct iphdr *)skb->data;
2205         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2206
2207         nfo.loc_addr = ntohl(iph->daddr);
2208         nfo.loc_port = ntohs(tcph->dest);
2209         nfo.rem_addr = ntohl(iph->saddr);
2210         nfo.rem_port = ntohs(tcph->source);
2211
2212         tmp_daddr = cpu_to_be32(iph->daddr);
2213         tmp_saddr = cpu_to_be32(iph->saddr);
2214
2215         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2216                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2217
2218         do {
2219                 cm_node = find_node(cm_core,
2220                         nfo.rem_port, nfo.rem_addr,
2221                         nfo.loc_port, nfo.loc_addr);
2222
2223                 if (!cm_node) {
2224                         /* Only type of packet accepted are for */
2225                         /* the PASSIVE open (syn only) */
2226                         if ((!tcph->syn) || (tcph->ack)) {
2227                                 skb_handled = 0;
2228                                 break;
2229                         }
2230                         listener = find_listener(cm_core, nfo.loc_addr,
2231                                 nfo.loc_port,
2232                                 NES_CM_LISTENER_ACTIVE_STATE);
2233                         if (!listener) {
2234                                 nfo.cm_id = NULL;
2235                                 nfo.conn_type = 0;
2236                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2237                                 skb_handled = 0;
2238                                 break;
2239                         }
2240                         nfo.cm_id = listener->cm_id;
2241                         nfo.conn_type = listener->conn_type;
2242                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2243                                 listener);
2244                         if (!cm_node) {
2245                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2246                                         "node\n");
2247                                 cm_packets_dropped++;
2248                                 atomic_dec(&listener->ref_count);
2249                                 dev_kfree_skb_any(skb);
2250                                 break;
2251                         }
2252                         if (!tcph->rst && !tcph->fin) {
2253                                 cm_node->state = NES_CM_STATE_LISTENING;
2254                         } else {
2255                                 cm_packets_dropped++;
2256                                 rem_ref_cm_node(cm_core, cm_node);
2257                                 dev_kfree_skb_any(skb);
2258                                 break;
2259                         }
2260                         add_ref_cm_node(cm_node);
2261                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2262                         rem_ref_cm_node(cm_core, cm_node);
2263                         atomic_inc(&cm_accel_dropped_pkts);
2264                         dev_kfree_skb_any(skb);
2265                         break;
2266                 }
2267                 skb_reset_network_header(skb);
2268                 skb_set_transport_header(skb, sizeof(*tcph));
2269                 skb->len = ntohs(iph->tot_len);
2270                 process_packet(cm_node, skb, cm_core);
2271                 rem_ref_cm_node(cm_core, cm_node);
2272         } while (0);
2273         return skb_handled;
2274 }
2275
2276
2277 /**
2278  * nes_cm_alloc_core - allocate a top level instance of a cm core
2279  */
2280 static struct nes_cm_core *nes_cm_alloc_core(void)
2281 {
2282         struct nes_cm_core *cm_core;
2283
2284         /* setup the CM core */
2285         /* alloc top level core control structure */
2286         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2287         if (!cm_core)
2288                 return NULL;
2289
2290         INIT_LIST_HEAD(&cm_core->connected_nodes);
2291         init_timer(&cm_core->tcp_timer);
2292         cm_core->tcp_timer.function = nes_cm_timer_tick;
2293
2294         cm_core->mtu   = NES_CM_DEFAULT_MTU;
2295         cm_core->state = NES_CM_STATE_INITED;
2296         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2297
2298         atomic_set(&cm_core->events_posted, 0);
2299
2300         cm_core->api = &nes_cm_api;
2301
2302         spin_lock_init(&cm_core->ht_lock);
2303         spin_lock_init(&cm_core->listen_list_lock);
2304
2305         INIT_LIST_HEAD(&cm_core->listen_list.list);
2306
2307         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2308
2309         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2310         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2311         cm_core->post_event = nes_cm_post_event;
2312         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2313         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2314
2315         print_core(cm_core);
2316         return cm_core;
2317 }
2318
2319
2320 /**
2321  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2322  */
2323 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2324 {
2325         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2326
2327         if (!cm_core)
2328                 return -EINVAL;
2329
2330         barrier();
2331
2332         if (timer_pending(&cm_core->tcp_timer)) {
2333                 del_timer(&cm_core->tcp_timer);
2334         }
2335
2336         destroy_workqueue(cm_core->event_wq);
2337         destroy_workqueue(cm_core->disconn_wq);
2338         nes_debug(NES_DBG_CM, "\n");
2339         kfree(cm_core);
2340
2341         return 0;
2342 }
2343
2344
2345 /**
2346  * mini_cm_get
2347  */
2348 static int mini_cm_get(struct nes_cm_core *cm_core)
2349 {
2350         return cm_core->state;
2351 }
2352
2353
2354 /**
2355  * mini_cm_set
2356  */
2357 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2358 {
2359         int ret = 0;
2360
2361         switch (type) {
2362         case NES_CM_SET_PKT_SIZE:
2363                 cm_core->mtu = value;
2364                 break;
2365         case NES_CM_SET_FREE_PKT_Q_SIZE:
2366                 cm_core->free_tx_pkt_max = value;
2367                 break;
2368         default:
2369                 /* unknown set option */
2370                 ret = -EINVAL;
2371         }
2372
2373         return ret;
2374 }
2375
2376
2377 /**
2378  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2379  * successfully exchanged when this is called
2380  */
2381 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2382 {
2383         int ret = 0;
2384
2385         if (!nesqp)
2386                 return -EINVAL;
2387
2388         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2389                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2390                         NES_QPCONTEXT_MISC_DROS);
2391
2392         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2393                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2394
2395         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2396
2397         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2398
2399         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2400                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2401
2402         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2403                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2404                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2405
2406         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2407                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2408                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2409
2410         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2411         nesqp->nesqp_context->ts_recent = 0;
2412         nesqp->nesqp_context->ts_age = 0;
2413         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2414         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2415         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2416         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2417                         cm_node->tcp_cntxt.rcv_wscale);
2418         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2419         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2420         nesqp->nesqp_context->srtt = 0;
2421         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2422         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2423         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2424         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2425         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2426         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2427
2428         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2429                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2430                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2431                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2432                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2433                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2434                         le32_to_cpu(nesqp->nesqp_context->misc));
2435         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2436         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2437         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2438
2439         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2440         cm_node->state = NES_CM_STATE_TSA;
2441
2442         return ret;
2443 }
2444
2445
2446 /**
2447  * nes_cm_disconn
2448  */
2449 int nes_cm_disconn(struct nes_qp *nesqp)
2450 {
2451         unsigned long flags;
2452
2453         spin_lock_irqsave(&nesqp->lock, flags);
2454         if (nesqp->disconn_pending == 0) {
2455                 nesqp->disconn_pending++;
2456                 spin_unlock_irqrestore(&nesqp->lock, flags);
2457                 /* init our disconnect work element, to */
2458                 INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);
2459
2460                 queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
2461         } else
2462                 spin_unlock_irqrestore(&nesqp->lock, flags);
2463
2464         return 0;
2465 }
2466
2467
2468 /**
2469  * nes_disconnect_worker
2470  */
2471 static void nes_disconnect_worker(struct work_struct *work)
2472 {
2473         struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);
2474
2475         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2476                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2477         nes_cm_disconn_true(nesqp);
2478 }
2479
2480
2481 /**
2482  * nes_cm_disconn_true
2483  */
2484 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2485 {
2486         unsigned long flags;
2487         int ret = 0;
2488         struct iw_cm_id *cm_id;
2489         struct iw_cm_event cm_event;
2490         struct nes_vnic *nesvnic;
2491         u16 last_ae;
2492         u8 original_hw_tcp_state;
2493         u8 original_ibqp_state;
2494         u8 issued_disconnect_reset = 0;
2495
2496         if (!nesqp) {
2497                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2498                 return -1;
2499         }
2500
2501         spin_lock_irqsave(&nesqp->lock, flags);
2502         cm_id = nesqp->cm_id;
2503         /* make sure we havent already closed this connection */
2504         if (!cm_id) {
2505                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2506                                 nesqp->hwqp.qp_id);
2507                 spin_unlock_irqrestore(&nesqp->lock, flags);
2508                 return -1;
2509         }
2510
2511         nesvnic = to_nesvnic(nesqp->ibqp.device);
2512         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2513
2514         original_hw_tcp_state = nesqp->hw_tcp_state;
2515         original_ibqp_state   = nesqp->ibqp_state;
2516         last_ae = nesqp->last_aeq;
2517
2518
2519         nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);
2520
2521         if ((nesqp->cm_id) && (cm_id->event_handler)) {
2522                 if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2523                                 ((original_ibqp_state == IB_QPS_RTS) &&
2524                                 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2525                         atomic_inc(&cm_disconnects);
2526                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2527                         if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
2528                                 cm_event.status = IW_CM_EVENT_STATUS_RESET;
2529                                 nes_debug(NES_DBG_CM, "Generating a CM "
2530                                         "Disconnect Event (status reset) for "
2531                                         "QP%u, cm_id = %p. \n",
2532                                         nesqp->hwqp.qp_id, cm_id);
2533                         } else
2534                                 cm_event.status = IW_CM_EVENT_STATUS_OK;
2535
2536                         cm_event.local_addr = cm_id->local_addr;
2537                         cm_event.remote_addr = cm_id->remote_addr;
2538                         cm_event.private_data = NULL;
2539                         cm_event.private_data_len = 0;
2540
2541                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2542                                 " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2543                                 "cm_id = %p, refcount = %u.\n",
2544                                 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2545                                 nesqp->hwqp.sq_tail, cm_id,
2546                                 atomic_read(&nesqp->refcount));
2547
2548                         spin_unlock_irqrestore(&nesqp->lock, flags);
2549                         ret = cm_id->event_handler(cm_id, &cm_event);
2550                         if (ret)
2551                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2552                                         "returned, ret=%d\n", ret);
2553                         spin_lock_irqsave(&nesqp->lock, flags);
2554                 }
2555
2556                 nesqp->disconn_pending = 0;
2557                 /* There might have been another AE while the lock was released */
2558                 original_hw_tcp_state = nesqp->hw_tcp_state;
2559                 original_ibqp_state   = nesqp->ibqp_state;
2560                 last_ae = nesqp->last_aeq;
2561
2562                 if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
2563                                 ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2564                                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2565                                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2566                                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2567                         atomic_inc(&cm_closes);
2568                         nesqp->cm_id = NULL;
2569                         nesqp->in_disconnect = 0;
2570                         spin_unlock_irqrestore(&nesqp->lock, flags);
2571                         nes_disconnect(nesqp, 1);
2572
2573                         cm_id->provider_data = nesqp;
2574                         /* Send up the close complete event */
2575                         cm_event.event = IW_CM_EVENT_CLOSE;
2576                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2577                         cm_event.provider_data = cm_id->provider_data;
2578                         cm_event.local_addr = cm_id->local_addr;
2579                         cm_event.remote_addr = cm_id->remote_addr;
2580                         cm_event.private_data = NULL;
2581                         cm_event.private_data_len = 0;
2582
2583                         ret = cm_id->event_handler(cm_id, &cm_event);
2584                         if (ret) {
2585                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2586                         }
2587
2588                         cm_id->rem_ref(cm_id);
2589
2590                         spin_lock_irqsave(&nesqp->lock, flags);
2591                         if (nesqp->flush_issued == 0) {
2592                                 nesqp->flush_issued = 1;
2593                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2594                                 flush_wqes(nesvnic->nesdev, nesqp,
2595                                         NES_CQP_FLUSH_RQ, 1);
2596                         } else
2597                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2598                 } else {
2599                         cm_id = nesqp->cm_id;
2600                         spin_unlock_irqrestore(&nesqp->lock, flags);
2601                         /* check to see if the inbound reset beat the outbound reset */
2602                         if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
2603                                 nes_debug(NES_DBG_CM, "QP%u: Decing refcount "
2604                                         "due to inbound reset beating the "
2605                                         "outbound reset.\n", nesqp->hwqp.qp_id);
2606                         }
2607                 }
2608         } else {
2609                 nesqp->disconn_pending = 0;
2610                 spin_unlock_irqrestore(&nesqp->lock, flags);
2611         }
2612
2613         return 0;
2614 }
2615
2616
2617 /**
2618  * nes_disconnect
2619  */
2620 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2621 {
2622         int ret = 0;
2623         struct nes_vnic *nesvnic;
2624         struct nes_device *nesdev;
2625         struct nes_ib_device *nesibdev;
2626
2627         nesvnic = to_nesvnic(nesqp->ibqp.device);
2628         if (!nesvnic)
2629                 return -EINVAL;
2630
2631         nesdev = nesvnic->nesdev;
2632         nesibdev = nesvnic->nesibdev;
2633
2634         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2635                         atomic_read(&nesvnic->netdev->refcnt));
2636
2637         if (nesqp->active_conn) {
2638
2639                 /* indicate this connection is NOT active */
2640                 nesqp->active_conn = 0;
2641         } else {
2642                 /* Need to free the Last Streaming Mode Message */
2643                 if (nesqp->ietf_frame) {
2644                         if (nesqp->lsmm_mr)
2645                                 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2646                         pci_free_consistent(nesdev->pcidev,
2647                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2648                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2649                 }
2650         }
2651
2652         /* close the CM node down if it is still active */
2653         if (nesqp->cm_node) {
2654                 nes_debug(NES_DBG_CM, "Call close API\n");
2655
2656                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2657         }
2658
2659         return ret;
2660 }
2661
2662
2663 /**
2664  * nes_accept
2665  */
2666 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2667 {
2668         u64 u64temp;
2669         struct ib_qp *ibqp;
2670         struct nes_qp *nesqp;
2671         struct nes_vnic *nesvnic;
2672         struct nes_device *nesdev;
2673         struct nes_cm_node *cm_node;
2674         struct nes_adapter *adapter;
2675         struct ib_qp_attr attr;
2676         struct iw_cm_event cm_event;
2677         struct nes_hw_qp_wqe *wqe;
2678         struct nes_v4_quad nes_quad;
2679         u32 crc_value;
2680         int ret;
2681         int passive_state;
2682         struct nes_ib_device *nesibdev;
2683         struct ib_mr *ibmr = NULL;
2684         struct ib_phys_buf ibphysbuf;
2685         struct nes_pd *nespd;
2686         u64 tagged_offset;
2687
2688
2689
2690         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2691         if (!ibqp)
2692                 return -EINVAL;
2693
2694         /* get all our handles */
2695         nesqp = to_nesqp(ibqp);
2696         nesvnic = to_nesvnic(nesqp->ibqp.device);
2697         nesdev = nesvnic->nesdev;
2698         adapter = nesdev->nesadapter;
2699
2700         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2701         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2702                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2703                 nesvnic->netdev->name);
2704
2705         /* associate the node with the QP */
2706         nesqp->cm_node = (void *)cm_node;
2707         cm_node->nesqp = nesqp;
2708
2709         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
2710                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2711         atomic_inc(&cm_accepts);
2712
2713         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2714                         atomic_read(&nesvnic->netdev->refcnt));
2715
2716         /* allocate the ietf frame and space for private data */
2717         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2718                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2719                 &nesqp->ietf_frame_pbase);
2720
2721         if (!nesqp->ietf_frame) {
2722                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
2723                         "data\n");
2724                 return -ENOMEM;
2725         }
2726
2727
2728         /* setup the MPA frame */
2729         nesqp->private_data_len = conn_param->private_data_len;
2730         memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2731
2732         memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2733                         conn_param->private_data_len);
2734
2735         nesqp->ietf_frame->priv_data_len =
2736                 cpu_to_be16(conn_param->private_data_len);
2737         nesqp->ietf_frame->rev = mpa_version;
2738         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2739
2740         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2741         wqe = &nesqp->hwqp.sq_vbase[0];
2742
2743         if (cm_id->remote_addr.sin_addr.s_addr !=
2744                         cm_id->local_addr.sin_addr.s_addr) {
2745                 u64temp = (unsigned long)nesqp;
2746                 nesibdev = nesvnic->nesibdev;
2747                 nespd = nesqp->nespd;
2748                 ibphysbuf.addr = nesqp->ietf_frame_pbase;
2749                 ibphysbuf.size = conn_param->private_data_len +
2750                                         sizeof(struct ietf_mpa_frame);
2751                 tagged_offset = (u64)(unsigned long)nesqp->ietf_frame;
2752                 ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
2753                                                 &ibphysbuf, 1,
2754                                                 IB_ACCESS_LOCAL_WRITE,
2755                                                 &tagged_offset);
2756                 if (!ibmr) {
2757                         nes_debug(NES_DBG_CM, "Unable to register memory region"
2758                                         "for lSMM for cm_node = %p \n",
2759                                         cm_node);
2760                         pci_free_consistent(nesdev->pcidev,
2761                                 nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2762                                 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2763                         return -ENOMEM;
2764                 }
2765
2766                 ibmr->pd = &nespd->ibpd;
2767                 ibmr->device = nespd->ibpd.device;
2768                 nesqp->lsmm_mr = ibmr;
2769
2770                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2771                 set_wqe_64bit_value(wqe->wqe_words,
2772                         NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2773                         u64temp);
2774                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2775                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2776                         NES_IWARP_SQ_WQE_WRPDU);
2777                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2778                         cpu_to_le32(conn_param->private_data_len +
2779                         sizeof(struct ietf_mpa_frame));
2780                 set_wqe_64bit_value(wqe->wqe_words,
2781                                         NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
2782                                         (u64)(unsigned long)nesqp->ietf_frame);
2783                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2784                         cpu_to_le32(conn_param->private_data_len +
2785                         sizeof(struct ietf_mpa_frame));
2786                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
2787
2788                 nesqp->nesqp_context->ird_ord_sizes |=
2789                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2790                         NES_QPCONTEXT_ORDIRD_WRPDU);
2791         } else {
2792                 nesqp->nesqp_context->ird_ord_sizes |=
2793                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
2794         }
2795         nesqp->skip_lsmm = 1;
2796
2797
2798         /* Cache the cm_id in the qp */
2799         nesqp->cm_id = cm_id;
2800         cm_node->cm_id = cm_id;
2801
2802         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2803         cm_id->provider_data = nesqp;
2804         nesqp->active_conn   = 0;
2805
2806         if (cm_node->state == NES_CM_STATE_TSA)
2807                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2808                         cm_node);
2809
2810         nes_cm_init_tsa_conn(nesqp, cm_node);
2811
2812         nesqp->nesqp_context->tcpPorts[0] =
2813                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2814         nesqp->nesqp_context->tcpPorts[1] =
2815                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2816
2817         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2818                 nesqp->nesqp_context->ip0 =
2819                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2820         else
2821                 nesqp->nesqp_context->ip0 =
2822                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2823
2824         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2825                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2826                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2827
2828         nesqp->nesqp_context->arp_index_vlan |=
2829                 cpu_to_le32(nes_arp_table(nesdev,
2830                         le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2831                         NES_ARP_RESOLVE) << 16);
2832
2833         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2834                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2835
2836         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2837
2838         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2839                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2840         nesqp->nesqp_context->ird_ord_sizes |=
2841                 cpu_to_le32((u32)conn_param->ord);
2842
2843         memset(&nes_quad, 0, sizeof(nes_quad));
2844         nes_quad.DstIpAdrIndex =
2845                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2846         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2847                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2848         else
2849                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2850         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2851         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2852
2853         /* Produce hash key */
2854         crc_value = get_crc_value(&nes_quad);
2855         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2856         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2857                 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2858
2859         nesqp->hte_index &= adapter->hte_index_mask;
2860         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2861
2862         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2863
2864         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2865                         "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2866                         "private data length=%zu.\n", nesqp->hwqp.qp_id,
2867                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2868                         ntohs(cm_id->remote_addr.sin_port),
2869                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2870                         ntohs(cm_id->local_addr.sin_port),
2871                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2872                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2873                         conn_param->private_data_len +
2874                         sizeof(struct ietf_mpa_frame));
2875
2876
2877         /* notify OF layer that accept event was successful */
2878         cm_id->add_ref(cm_id);
2879         nes_add_ref(&nesqp->ibqp);
2880
2881         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2882         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2883         cm_event.provider_data = (void *)nesqp;
2884         cm_event.local_addr = cm_id->local_addr;
2885         cm_event.remote_addr = cm_id->remote_addr;
2886         cm_event.private_data = NULL;
2887         cm_event.private_data_len = 0;
2888         ret = cm_id->event_handler(cm_id, &cm_event);
2889         attr.qp_state = IB_QPS_RTS;
2890         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2891         if (cm_node->loopbackpartner) {
2892                 cm_node->loopbackpartner->mpa_frame_size =
2893                         nesqp->private_data_len;
2894                 /* copy entire MPA frame to our cm_node's frame */
2895                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2896                         nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2897                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2898         }
2899         if (ret)
2900                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2901                         "ret=%d\n", __func__, __LINE__, ret);
2902
2903         passive_state = atomic_add_return(1, &cm_node->passive_state);
2904         if (passive_state == NES_SEND_RESET_EVENT)
2905                 create_event(cm_node, NES_CM_EVENT_RESET);
2906         return 0;
2907 }
2908
2909
2910 /**
2911  * nes_reject
2912  */
2913 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2914 {
2915         struct nes_cm_node *cm_node;
2916         struct nes_cm_node *loopback;
2917
2918         struct nes_cm_core *cm_core;
2919
2920         atomic_inc(&cm_rejects);
2921         cm_node = (struct nes_cm_node *) cm_id->provider_data;
2922         loopback = cm_node->loopbackpartner;
2923         cm_core = cm_node->cm_core;
2924         cm_node->cm_id = cm_id;
2925         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
2926
2927         if (cm_node->mpa_frame_size > MAX_CM_BUFFER)
2928                 return -EINVAL;
2929
2930         strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
2931         if (loopback) {
2932                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
2933                 loopback->mpa_frame.priv_data_len = pdata_len;
2934                 loopback->mpa_frame_size = sizeof(struct ietf_mpa_frame) +
2935                                 pdata_len;
2936         } else {
2937                 memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
2938                 cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
2939         }
2940
2941         cm_node->mpa_frame.rev = mpa_version;
2942         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
2943
2944         return cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
2945 }
2946
2947
2948 /**
2949  * nes_connect
2950  * setup and launch cm connect node
2951  */
2952 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2953 {
2954         struct ib_qp *ibqp;
2955         struct nes_qp *nesqp;
2956         struct nes_vnic *nesvnic;
2957         struct nes_device *nesdev;
2958         struct nes_cm_node *cm_node;
2959         struct nes_cm_info cm_info;
2960         int apbvt_set = 0;
2961
2962         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2963         if (!ibqp)
2964                 return -EINVAL;
2965         nesqp = to_nesqp(ibqp);
2966         if (!nesqp)
2967                 return -EINVAL;
2968         nesvnic = to_nesvnic(nesqp->ibqp.device);
2969         if (!nesvnic)
2970                 return -EINVAL;
2971         nesdev  = nesvnic->nesdev;
2972         if (!nesdev)
2973                 return -EINVAL;
2974
2975         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
2976                 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
2977                 ntohl(nesvnic->local_ipaddr),
2978                 ntohl(cm_id->remote_addr.sin_addr.s_addr),
2979                 ntohs(cm_id->remote_addr.sin_port),
2980                 ntohl(cm_id->local_addr.sin_addr.s_addr),
2981                 ntohs(cm_id->local_addr.sin_port));
2982
2983         atomic_inc(&cm_connects);
2984         nesqp->active_conn = 1;
2985
2986         /* cache the cm_id in the qp */
2987         nesqp->cm_id = cm_id;
2988
2989         cm_id->provider_data = nesqp;
2990
2991         nesqp->private_data_len = conn_param->private_data_len;
2992         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2993         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
2994         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
2995                 conn_param->private_data_len);
2996
2997         if (cm_id->local_addr.sin_addr.s_addr !=
2998                 cm_id->remote_addr.sin_addr.s_addr) {
2999                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3000                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3001                 apbvt_set = 1;
3002         }
3003
3004         /* set up the connection params for the node */
3005         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3006         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3007         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3008         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3009         cm_info.cm_id = cm_id;
3010         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3011
3012         cm_id->add_ref(cm_id);
3013
3014         /* create a connect CM node connection */
3015         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3016                 conn_param->private_data_len, (void *)conn_param->private_data,
3017                 &cm_info);
3018         if (!cm_node) {
3019                 if (apbvt_set)
3020                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3021                                 PCI_FUNC(nesdev->pcidev->devfn),
3022                                 NES_MANAGE_APBVT_DEL);
3023
3024                 cm_id->rem_ref(cm_id);
3025                 return -ENOMEM;
3026         }
3027
3028         cm_node->apbvt_set = apbvt_set;
3029         nesqp->cm_node = cm_node;
3030         cm_node->nesqp = nesqp;
3031         nes_add_ref(&nesqp->ibqp);
3032
3033         return 0;
3034 }
3035
3036
3037 /**
3038  * nes_create_listen
3039  */
3040 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3041 {
3042         struct nes_vnic *nesvnic;
3043         struct nes_cm_listener *cm_node;
3044         struct nes_cm_info cm_info;
3045         struct nes_adapter *adapter;
3046         int err;
3047
3048
3049         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3050                         cm_id, ntohs(cm_id->local_addr.sin_port));
3051
3052         nesvnic = to_nesvnic(cm_id->device);
3053         if (!nesvnic)
3054                 return -EINVAL;
3055         adapter = nesvnic->nesdev->nesadapter;
3056         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3057                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3058
3059         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3060                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3061
3062         /* setup listen params in our api call struct */
3063         cm_info.loc_addr = nesvnic->local_ipaddr;
3064         cm_info.loc_port = cm_id->local_addr.sin_port;
3065         cm_info.backlog = backlog;
3066         cm_info.cm_id = cm_id;
3067
3068         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3069
3070
3071         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3072         if (!cm_node) {
3073                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3074                                 __func__, __LINE__);
3075                 return -ENOMEM;
3076         }
3077
3078         cm_id->provider_data = cm_node;
3079
3080         if (!cm_node->reused_node) {
3081                 err = nes_manage_apbvt(nesvnic,
3082                         ntohs(cm_id->local_addr.sin_port),
3083                         PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3084                         NES_MANAGE_APBVT_ADD);
3085                 if (err) {
3086                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3087                                 err);
3088                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3089                         return err;
3090                 }
3091                 cm_listens_created++;
3092         }
3093
3094         cm_id->add_ref(cm_id);
3095         cm_id->provider_data = (void *)cm_node;
3096
3097
3098         return 0;
3099 }
3100
3101
3102 /**
3103  * nes_destroy_listen
3104  */
3105 int nes_destroy_listen(struct iw_cm_id *cm_id)
3106 {
3107         if (cm_id->provider_data)
3108                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3109         else
3110                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3111
3112         cm_id->rem_ref(cm_id);
3113
3114         return 0;
3115 }
3116
3117
3118 /**
3119  * nes_cm_recv
3120  */
3121 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3122 {
3123         int rc = 0;
3124         cm_packets_received++;
3125         if ((g_cm_core) && (g_cm_core->api)) {
3126                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3127         } else {
3128                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3129                                 " cm is not setup properly.\n");
3130         }
3131
3132         return rc;
3133 }
3134
3135
3136 /**
3137  * nes_cm_start
3138  * Start and init a cm core module
3139  */
3140 int nes_cm_start(void)
3141 {
3142         nes_debug(NES_DBG_CM, "\n");
3143         /* create the primary CM core, pass this handle to subsequent core inits */
3144         g_cm_core = nes_cm_alloc_core();
3145         if (g_cm_core) {
3146                 return 0;
3147         } else {
3148                 return -ENOMEM;
3149         }
3150 }
3151
3152
3153 /**
3154  * nes_cm_stop
3155  * stop and dealloc all cm core instances
3156  */
3157 int nes_cm_stop(void)
3158 {
3159         g_cm_core->api->destroy_cm_core(g_cm_core);
3160         return 0;
3161 }
3162
3163
3164 /**
3165  * cm_event_connected
3166  * handle a connected event, setup QPs and HW
3167  */
3168 static void cm_event_connected(struct nes_cm_event *event)
3169 {
3170         u64 u64temp;
3171         struct nes_qp *nesqp;
3172         struct nes_vnic *nesvnic;
3173         struct nes_device *nesdev;
3174         struct nes_cm_node *cm_node;
3175         struct nes_adapter *nesadapter;
3176         struct ib_qp_attr attr;
3177         struct iw_cm_id *cm_id;
3178         struct iw_cm_event cm_event;
3179         struct nes_hw_qp_wqe *wqe;
3180         struct nes_v4_quad nes_quad;
3181         u32 crc_value;
3182         int ret;
3183
3184         /* get all our handles */
3185         cm_node = event->cm_node;
3186         cm_id = cm_node->cm_id;
3187         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3188         nesqp = (struct nes_qp *)cm_id->provider_data;
3189         nesvnic = to_nesvnic(nesqp->ibqp.device);
3190         nesdev = nesvnic->nesdev;
3191         nesadapter = nesdev->nesadapter;
3192
3193         if (nesqp->destroyed) {
3194                 return;
3195         }
3196         atomic_inc(&cm_connecteds);
3197         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3198                         " local port 0x%04X. jiffies = %lu.\n",
3199                         nesqp->hwqp.qp_id,
3200                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
3201                         ntohs(cm_id->remote_addr.sin_port),
3202                         ntohs(cm_id->local_addr.sin_port),
3203                         jiffies);
3204
3205         nes_cm_init_tsa_conn(nesqp, cm_node);
3206
3207         /* set the QP tsa context */
3208         nesqp->nesqp_context->tcpPorts[0] =
3209                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3210         nesqp->nesqp_context->tcpPorts[1] =
3211                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3212         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3213                 nesqp->nesqp_context->ip0 =
3214                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3215         else
3216                 nesqp->nesqp_context->ip0 =
3217                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3218
3219         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3220                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3221                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3222         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3223                         nes_arp_table(nesdev,
3224                         le32_to_cpu(nesqp->nesqp_context->ip0),
3225                         NULL, NES_ARP_RESOLVE) << 16);
3226         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3227                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3228         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3229         nesqp->nesqp_context->ird_ord_sizes |=
3230                         cpu_to_le32((u32)1 <<
3231                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3232
3233         /* Adjust tail for not having a LSMM */
3234         nesqp->hwqp.sq_tail = 1;
3235
3236 #if defined(NES_SEND_FIRST_WRITE)
3237         if (cm_node->send_write0) {
3238                 nes_debug(NES_DBG_CM, "Sending first write.\n");
3239                 wqe = &nesqp->hwqp.sq_vbase[0];
3240                 u64temp = (unsigned long)nesqp;
3241                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3242                 set_wqe_64bit_value(wqe->wqe_words,
3243                                 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3244                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3245                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3246                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3247                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3248                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3249                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3250                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3251
3252                 /* use the reserved spot on the WQ for the extra first WQE */
3253                 nesqp->nesqp_context->ird_ord_sizes &=
3254                         cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3255                                                 NES_QPCONTEXT_ORDIRD_WRPDU |
3256                                                 NES_QPCONTEXT_ORDIRD_ALSMM));
3257                 nesqp->skip_lsmm = 1;
3258                 nesqp->hwqp.sq_tail = 0;
3259                 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3260                                 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3261         }
3262 #endif
3263
3264         memset(&nes_quad, 0, sizeof(nes_quad));
3265
3266         nes_quad.DstIpAdrIndex =
3267                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3268         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3269                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3270         else
3271                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3272         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3273         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3274
3275         /* Produce hash key */
3276         crc_value = get_crc_value(&nes_quad);
3277         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3278         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3279                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3280
3281         nesqp->hte_index &= nesadapter->hte_index_mask;
3282         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3283
3284         nesqp->ietf_frame = &cm_node->mpa_frame;
3285         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3286         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3287
3288         /* notify OF layer we successfully created the requested connection */
3289         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3290         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
3291         cm_event.provider_data = cm_id->provider_data;
3292         cm_event.local_addr.sin_family = AF_INET;
3293         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3294         cm_event.remote_addr = cm_id->remote_addr;
3295
3296         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3297         cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3298
3299         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3300         ret = cm_id->event_handler(cm_id, &cm_event);
3301         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3302
3303         if (ret)
3304                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3305                         "ret=%d\n", __func__, __LINE__, ret);
3306         attr.qp_state = IB_QPS_RTS;
3307         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3308
3309         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3310                 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3311
3312         return;
3313 }
3314
3315
3316 /**
3317  * cm_event_connect_error
3318  */
3319 static void cm_event_connect_error(struct nes_cm_event *event)
3320 {
3321         struct nes_qp *nesqp;
3322         struct iw_cm_id *cm_id;
3323         struct iw_cm_event cm_event;
3324         /* struct nes_cm_info cm_info; */
3325         int ret;
3326
3327         if (!event->cm_node)
3328                 return;
3329
3330         cm_id = event->cm_node->cm_id;
3331         if (!cm_id) {
3332                 return;
3333         }
3334
3335         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3336         nesqp = cm_id->provider_data;
3337
3338         if (!nesqp) {
3339                 return;
3340         }
3341
3342         /* notify OF layer about this connection error event */
3343         /* cm_id->rem_ref(cm_id); */
3344         nesqp->cm_id = NULL;
3345         cm_id->provider_data = NULL;
3346         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3347         cm_event.status = IW_CM_EVENT_STATUS_REJECTED;
3348         cm_event.provider_data = cm_id->provider_data;
3349         cm_event.local_addr = cm_id->local_addr;
3350         cm_event.remote_addr = cm_id->remote_addr;
3351         cm_event.private_data = NULL;
3352         cm_event.private_data_len = 0;
3353
3354         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3355                 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3356                 cm_event.remote_addr.sin_addr.s_addr);
3357
3358         ret = cm_id->event_handler(cm_id, &cm_event);
3359         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3360         if (ret)
3361                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3362                         "ret=%d\n", __func__, __LINE__, ret);
3363         cm_id->rem_ref(cm_id);
3364
3365         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3366         return;
3367 }
3368
3369
3370 /**
3371  * cm_event_reset
3372  */
3373 static void cm_event_reset(struct nes_cm_event *event)
3374 {
3375         struct nes_qp *nesqp;
3376         struct iw_cm_id *cm_id;
3377         struct iw_cm_event cm_event;
3378         /* struct nes_cm_info cm_info; */
3379         int ret;
3380
3381         if (!event->cm_node)
3382                 return;
3383
3384         if (!event->cm_node->cm_id)
3385                 return;
3386
3387         cm_id = event->cm_node->cm_id;
3388
3389         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3390         nesqp = cm_id->provider_data;
3391
3392         nesqp->cm_id = NULL;
3393         /* cm_id->provider_data = NULL; */
3394         cm_event.event = IW_CM_EVENT_DISCONNECT;
3395         cm_event.status = IW_CM_EVENT_STATUS_RESET;
3396         cm_event.provider_data = cm_id->provider_data;
3397         cm_event.local_addr = cm_id->local_addr;
3398         cm_event.remote_addr = cm_id->remote_addr;
3399         cm_event.private_data = NULL;
3400         cm_event.private_data_len = 0;
3401
3402         ret = cm_id->event_handler(cm_id, &cm_event);
3403         cm_id->add_ref(cm_id);
3404         atomic_inc(&cm_closes);
3405         cm_event.event = IW_CM_EVENT_CLOSE;
3406         cm_event.status = IW_CM_EVENT_STATUS_OK;
3407         cm_event.provider_data = cm_id->provider_data;
3408         cm_event.local_addr = cm_id->local_addr;
3409         cm_event.remote_addr = cm_id->remote_addr;
3410         cm_event.private_data = NULL;
3411         cm_event.private_data_len = 0;
3412         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3413         ret = cm_id->event_handler(cm_id, &cm_event);
3414
3415         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3416
3417
3418         /* notify OF layer about this connection error event */
3419         cm_id->rem_ref(cm_id);
3420
3421         return;
3422 }
3423
3424
3425 /**
3426  * cm_event_mpa_req
3427  */
3428 static void cm_event_mpa_req(struct nes_cm_event *event)
3429 {
3430         struct iw_cm_id   *cm_id;
3431         struct iw_cm_event cm_event;
3432         int ret;
3433         struct nes_cm_node *cm_node;
3434
3435         cm_node = event->cm_node;
3436         if (!cm_node)
3437                 return;
3438         cm_id = cm_node->cm_id;
3439
3440         atomic_inc(&cm_connect_reqs);
3441         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3442                         cm_node, cm_id, jiffies);
3443
3444         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3445         cm_event.status = IW_CM_EVENT_STATUS_OK;
3446         cm_event.provider_data = (void *)cm_node;
3447
3448         cm_event.local_addr.sin_family = AF_INET;
3449         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3450         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3451
3452         cm_event.remote_addr.sin_family = AF_INET;
3453         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3454         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3455         cm_event.private_data = cm_node->mpa_frame_buf;
3456         cm_event.private_data_len  = (u8) cm_node->mpa_frame_size;
3457
3458         ret = cm_id->event_handler(cm_id, &cm_event);
3459         if (ret)
3460                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3461                                 __func__, __LINE__, ret);
3462         return;
3463 }
3464
3465
3466 static void cm_event_mpa_reject(struct nes_cm_event *event)
3467 {
3468         struct iw_cm_id   *cm_id;
3469         struct iw_cm_event cm_event;
3470         struct nes_cm_node *cm_node;
3471         int ret;
3472
3473         cm_node = event->cm_node;
3474         if (!cm_node)
3475                 return;
3476         cm_id = cm_node->cm_id;
3477
3478         atomic_inc(&cm_connect_reqs);
3479         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3480                         cm_node, cm_id, jiffies);
3481
3482         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3483         cm_event.status = -ECONNREFUSED;
3484         cm_event.provider_data = cm_id->provider_data;
3485
3486         cm_event.local_addr.sin_family = AF_INET;
3487         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3488         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3489
3490         cm_event.remote_addr.sin_family = AF_INET;
3491         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3492         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3493
3494         cm_event.private_data = cm_node->mpa_frame_buf;
3495         cm_event.private_data_len = (u8) cm_node->mpa_frame_size;
3496
3497         nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3498                         "remove_addr=%08x\n",
3499                         cm_event.local_addr.sin_addr.s_addr,
3500                         cm_event.remote_addr.sin_addr.s_addr);
3501
3502         ret = cm_id->event_handler(cm_id, &cm_event);
3503         if (ret)
3504                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3505                                 __func__, __LINE__, ret);
3506
3507         return;
3508 }
3509
3510
3511 static void nes_cm_event_handler(struct work_struct *);
3512
3513 /**
3514  * nes_cm_post_event
3515  * post an event to the cm event handler
3516  */
3517 static int nes_cm_post_event(struct nes_cm_event *event)
3518 {
3519         atomic_inc(&event->cm_node->cm_core->events_posted);
3520         add_ref_cm_node(event->cm_node);
3521         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3522         INIT_WORK(&event->event_work, nes_cm_event_handler);
3523         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3524                 event->cm_node, event);
3525
3526         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3527
3528         nes_debug(NES_DBG_CM, "Exit\n");
3529         return 0;
3530 }
3531
3532
3533 /**
3534  * nes_cm_event_handler
3535  * worker function to handle cm events
3536  * will free instance of nes_cm_event
3537  */
3538 static void nes_cm_event_handler(struct work_struct *work)
3539 {
3540         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3541                         event_work);
3542         struct nes_cm_core *cm_core;
3543
3544         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3545                 return;
3546
3547         cm_core = event->cm_node->cm_core;
3548         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3549                 event, event->type, atomic_read(&cm_core->events_posted));
3550
3551         switch (event->type) {
3552         case NES_CM_EVENT_MPA_REQ:
3553                 cm_event_mpa_req(event);
3554                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3555                         event->cm_node);
3556                 break;
3557         case NES_CM_EVENT_RESET:
3558                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3559                         event->cm_node);
3560                 cm_event_reset(event);
3561                 break;
3562         case NES_CM_EVENT_CONNECTED:
3563                 if ((!event->cm_node->cm_id) ||
3564                         (event->cm_node->state != NES_CM_STATE_TSA))
3565                         break;
3566                 cm_event_connected(event);
3567                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3568                 break;
3569         case NES_CM_EVENT_MPA_REJECT:
3570                 if ((!event->cm_node->cm_id) ||
3571                                 (event->cm_node->state == NES_CM_STATE_TSA))
3572                         break;
3573                 cm_event_mpa_reject(event);
3574                 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3575                 break;
3576
3577         case NES_CM_EVENT_ABORTED:
3578                 if ((!event->cm_node->cm_id) ||
3579                         (event->cm_node->state == NES_CM_STATE_TSA))
3580                         break;
3581                 cm_event_connect_error(event);
3582                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3583                 break;
3584         case NES_CM_EVENT_DROPPED_PKT:
3585                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3586                 break;
3587         default:
3588                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3589                 break;
3590         }
3591
3592         atomic_dec(&cm_core->events_posted);
3593         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3594         rem_ref_cm_node(cm_core, event->cm_node);
3595         kfree(event);
3596
3597         return;
3598 }