drivers/infiniband/hw/nes/nes_cm.c

   1 /*
   2  * Copyright (c) 2006 - 2008 NetEffect, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34
  35 #define TCPOPT_TIMESTAMP 8
  36
  37 #include <asm/atomic.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/ip.h>
  40 #include <linux/tcp.h>
  41 #include <linux/init.h>
  42 #include <linux/if_arp.h>
  43 #include <linux/if_vlan.h>
  44 #include <linux/notifier.h>
  45 #include <linux/net.h>
  46 #include <linux/types.h>
  47 #include <linux/timer.h>
  48 #include <linux/time.h>
  49 #include <linux/delay.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/random.h>
  53 #include <linux/list.h>
  54 #include <linux/threads.h>
  55
  56 #include <net/neighbour.h>
  57 #include <net/route.h>
  58 #include <net/ip_fib.h>
  59
  60 #include "nes.h"
  61
  62 u32 cm_packets_sent;
  63 u32 cm_packets_bounced;
  64 u32 cm_packets_dropped;
  65 u32 cm_packets_retrans;
  66 u32 cm_packets_created;
  67 u32 cm_packets_received;
  68 u32 cm_listens_created;
  69 u32 cm_listens_destroyed;
  70 u32 cm_backlog_drops;
  71 atomic_t cm_loopbacks;
  72 atomic_t cm_nodes_created;
  73 atomic_t cm_nodes_destroyed;
  74 atomic_t cm_accel_dropped_pkts;
  75 atomic_t cm_resets_recvd;
  76
  77 static inline int mini_cm_accelerated(struct nes_cm_core *, struct nes_cm_node *);
  78 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
  79                 struct nes_vnic *, struct nes_cm_info *);
  80 static int add_ref_cm_node(struct nes_cm_node *);
  81 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
  82 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
  83 static struct sk_buff *form_cm_frame(struct sk_buff *, struct nes_cm_node *,
  84                                      void *, u32, void *, u32, u8);
  85 static struct sk_buff *get_free_pkt(struct nes_cm_node *cm_node);
  86
  87 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *,
  88                                            struct nes_vnic *,
  89                                            struct ietf_mpa_frame *,
  90                                            struct nes_cm_info *);
  91 static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
  92                           struct nes_cm_node *);
  93 static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
  94                           struct nes_cm_node *);
  95 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
  96 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *,
  97                             struct sk_buff *);
  98 static int mini_cm_dealloc_core(struct nes_cm_core *);
  99 static int mini_cm_get(struct nes_cm_core *);
 100 static int mini_cm_set(struct nes_cm_core *, u32, u32);
 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 static int send_ack(struct nes_cm_node *cm_node);
 106 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
 107
 108 /* External CM API Interface */
 109 /* instance of function pointers for client API */
 110 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
 111 static struct nes_cm_ops nes_cm_api = {
 112         mini_cm_accelerated,
 113         mini_cm_listen,
 114         mini_cm_del_listen,
 115         mini_cm_connect,
 116         mini_cm_close,
 117         mini_cm_accept,
 118         mini_cm_reject,
 119         mini_cm_recv_pkt,
 120         mini_cm_dealloc_core,
 121         mini_cm_get,
 122         mini_cm_set
 123 };
 124
 125 static struct nes_cm_core *g_cm_core;
 126
 127 atomic_t cm_connects;
 128 atomic_t cm_accepts;
 129 atomic_t cm_disconnects;
 130 atomic_t cm_closes;
 131 atomic_t cm_connecteds;
 132 atomic_t cm_connect_reqs;
 133 atomic_t cm_rejects;
 134
 135
 136 /**
 137  * create_event
 138  */
 139 static struct nes_cm_event *create_event(struct nes_cm_node *cm_node,
 140                 enum nes_cm_event_type type)
 141 {
 142         struct nes_cm_event *event;
 143
 144         if (!cm_node->cm_id)
 145                 return NULL;
 146
 147         /* allocate an empty event */
 148         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 149
 150         if (!event)
 151                 return NULL;
 152
 153         event->type = type;
 154         event->cm_node = cm_node;
 155         event->cm_info.rem_addr = cm_node->rem_addr;
 156         event->cm_info.loc_addr = cm_node->loc_addr;
 157         event->cm_info.rem_port = cm_node->rem_port;
 158         event->cm_info.loc_port = cm_node->loc_port;
 159         event->cm_info.cm_id = cm_node->cm_id;
 160
 161         nes_debug(NES_DBG_CM, "Created event=%p, type=%u, dst_addr=%08x[%x],"
 162                         " src_addr=%08x[%x]\n",
 163                         event, type,
 164                         event->cm_info.loc_addr, event->cm_info.loc_port,
 165                         event->cm_info.rem_addr, event->cm_info.rem_port);
 166
 167         nes_cm_post_event(event);
 168         return event;
 169 }
 170
 171
 172 /**
 173  * send_mpa_request
 174  */
 175 static int send_mpa_request(struct nes_cm_node *cm_node)
 176 {
 177         struct sk_buff *skb;
 178         int ret;
 179
 180         skb = get_free_pkt(cm_node);
 181         if (!skb) {
 182                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 183                 return -1;
 184         }
 185
 186         /* send an MPA Request frame */
 187         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 188                         cm_node->mpa_frame_size, SET_ACK);
 189
 190         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 191         if (ret < 0) {
 192                 return ret;
 193         }
 194
 195         return 0;
 196 }
 197
 198
 199 /**
 200  * recv_mpa - process a received TCP pkt, we are expecting an
 201  * IETF MPA frame
 202  */
 203 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 len)
 204 {
 205         struct ietf_mpa_frame *mpa_frame;
 206
 207         /* assume req frame is in tcp data payload */
 208         if (len < sizeof(struct ietf_mpa_frame)) {
 209                 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
 210                 return -1;
 211         }
 212
 213         mpa_frame = (struct ietf_mpa_frame *)buffer;
 214         cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
 215
 216         if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
 217                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
 218                                 " complete (%x + %x != %x)\n",
 219                                 cm_node->mpa_frame_size, (u32)sizeof(struct ietf_mpa_frame), len);
 220                 return -1;
 221         }
 222
 223         /* copy entire MPA frame to our cm_node's frame */
 224         memcpy(cm_node->mpa_frame_buf, buffer + sizeof(struct ietf_mpa_frame),
 225                         cm_node->mpa_frame_size);
 226
 227         return 0;
 228 }
 229
 230
 231 /**
 232  * handle_exception_pkt - process an exception packet.
 233  * We have been in a TSA state, and we have now received SW
 234  * TCP/IP traffic should be a FIN request or IP pkt with options
 235  */
 236 static int handle_exception_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb)
 237 {
 238         int ret = 0;
 239         struct tcphdr *tcph = tcp_hdr(skb);
 240
 241         /* first check to see if this a FIN pkt */
 242         if (tcph->fin) {
 243                 /* we need to ACK the FIN request */
 244                 send_ack(cm_node);
 245
 246                 /* check which side we are (client/server) and set next state accordingly */
 247                 if (cm_node->tcp_cntxt.client)
 248                         cm_node->state = NES_CM_STATE_CLOSING;
 249                 else {
 250                         /* we are the server side */
 251                         cm_node->state = NES_CM_STATE_CLOSE_WAIT;
 252                         /* since this is a self contained CM we don't wait for */
 253                         /* an APP to close us, just send final FIN immediately */
 254                         ret = send_fin(cm_node, NULL);
 255                         cm_node->state = NES_CM_STATE_LAST_ACK;
 256                 }
 257         } else {
 258                 ret = -EINVAL;
 259         }
 260
 261         return ret;
 262 }
 263
 264
 265 /**
 266  * form_cm_frame - get a free packet and build empty frame Use
 267  * node info to build.
 268  */
 269 static struct sk_buff *form_cm_frame(struct sk_buff *skb, struct nes_cm_node *cm_node,
 270                                      void *options, u32 optionsize, void *data,
 271                                      u32 datasize, u8 flags)
 272 {
 273         struct tcphdr *tcph;
 274         struct iphdr *iph;
 275         struct ethhdr *ethh;
 276         u8 *buf;
 277         u16 packetsize = sizeof(*iph);
 278
 279         packetsize += sizeof(*tcph);
 280         packetsize +=  optionsize + datasize;
 281
 282         memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
 283
 284         skb->len = 0;
 285         buf = skb_put(skb, packetsize + ETH_HLEN);
 286
 287         ethh = (struct ethhdr *) buf;
 288         buf += ETH_HLEN;
 289
 290         iph = (struct iphdr *)buf;
 291         buf += sizeof(*iph);
 292         tcph = (struct tcphdr *)buf;
 293         skb_reset_mac_header(skb);
 294         skb_set_network_header(skb, ETH_HLEN);
 295         skb_set_transport_header(skb, ETH_HLEN+sizeof(*iph));
 296         buf += sizeof(*tcph);
 297
 298         skb->ip_summed = CHECKSUM_PARTIAL;
 299         skb->protocol = htons(0x800);
 300         skb->data_len = 0;
 301         skb->mac_len = ETH_HLEN;
 302
 303         memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
 304         memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
 305         ethh->h_proto = htons(0x0800);
 306
 307         iph->version = IPVERSION;
 308         iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
 309         iph->tos = 0;
 310         iph->tot_len = htons(packetsize);
 311         iph->id = htons(++cm_node->tcp_cntxt.loc_id);
 312
 313         iph->frag_off = htons(0x4000);
 314         iph->ttl = 0x40;
 315         iph->protocol = 0x06;   /* IPPROTO_TCP */
 316
 317         iph->saddr = htonl(cm_node->loc_addr);
 318         iph->daddr = htonl(cm_node->rem_addr);
 319
 320         tcph->source = htons(cm_node->loc_port);
 321         tcph->dest = htons(cm_node->rem_port);
 322         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
 323
 324         if (flags & SET_ACK) {
 325                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
 326                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
 327                 tcph->ack = 1;
 328         } else
 329                 tcph->ack_seq = 0;
 330
 331         if (flags & SET_SYN) {
 332                 cm_node->tcp_cntxt.loc_seq_num++;
 333                 tcph->syn = 1;
 334         } else
 335                 cm_node->tcp_cntxt.loc_seq_num += datasize;     /* data (no headers) */
 336
 337         if (flags & SET_FIN)
 338                 tcph->fin = 1;
 339
 340         if (flags & SET_RST)
 341                 tcph->rst = 1;
 342
 343         tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
 344         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
 345         tcph->urg_ptr = 0;
 346         if (optionsize)
 347                 memcpy(buf, options, optionsize);
 348         buf += optionsize;
 349         if (datasize)
 350                 memcpy(buf, data, datasize);
 351
 352         skb_shinfo(skb)->nr_frags = 0;
 353         cm_packets_created++;
 354
 355         return skb;
 356 }
 357
 358
 359 /**
 360  * print_core - dump a cm core
 361  */
 362 static void print_core(struct nes_cm_core *core)
 363 {
 364         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 365         nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
 366         if (!core)
 367                 return;
 368         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 369
 370         nes_debug(NES_DBG_CM, "State         : %u \n",  core->state);
 371
 372         nes_debug(NES_DBG_CM, "Tx Free cnt   : %u \n", skb_queue_len(&core->tx_free_list));
 373         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
 374         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
 375
 376         nes_debug(NES_DBG_CM, "core          : %p \n", core);
 377
 378         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
 379 }
 380
 381
 382 /**
 383  * schedule_nes_timer
 384  * note - cm_node needs to be protected before calling this. Encase in:
 385  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 386  */
 387 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
 388                 enum nes_timer_type type, int send_retrans,
 389                 int close_when_complete)
 390 {
 391         unsigned long  flags;
 392         struct nes_cm_core *cm_core;
 393         struct nes_timer_entry *new_send;
 394         int ret = 0;
 395         u32 was_timer_set;
 396
 397         if (!cm_node)
 398                 return -EINVAL;
 399         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
 400         if (!new_send)
 401                 return -1;
 402
 403         /* new_send->timetosend = currenttime */
 404         new_send->retrycount = NES_DEFAULT_RETRYS;
 405         new_send->retranscount = NES_DEFAULT_RETRANS;
 406         new_send->skb = skb;
 407         new_send->timetosend = jiffies;
 408         new_send->type = type;
 409         new_send->netdev = cm_node->netdev;
 410         new_send->send_retrans = send_retrans;
 411         new_send->close_when_complete = close_when_complete;
 412
 413         if (type == NES_TIMER_TYPE_CLOSE) {
 414                 new_send->timetosend += (HZ/2); /* TODO: decide on the correct value here */
 415                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
 416                 list_add_tail(&new_send->list, &cm_node->recv_list);
 417                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
 418         }
 419
 420         if (type == NES_TIMER_TYPE_SEND) {
 421                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 422                 atomic_inc(&new_send->skb->users);
 423
 424                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
 425                 if (ret != NETDEV_TX_OK) {
 426                         nes_debug(NES_DBG_CM, "Error sending packet %p (jiffies = %lu)\n",
 427                                         new_send, jiffies);
 428                         atomic_dec(&new_send->skb->users);
 429                         new_send->timetosend = jiffies;
 430                 } else {
 431                         cm_packets_sent++;
 432                         if (!send_retrans) {
 433                                 if (close_when_complete)
 434                                         rem_ref_cm_node(cm_node->cm_core, cm_node);
 435                                 dev_kfree_skb_any(new_send->skb);
 436                                 kfree(new_send);
 437                                 return ret;
 438                         }
 439                         new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
 440                 }
 441                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 442                 list_add_tail(&new_send->list, &cm_node->retrans_list);
 443                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 444         }
 445         if (type == NES_TIMER_TYPE_RECV) {
 446                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 447                 new_send->timetosend = jiffies;
 448                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
 449                 list_add_tail(&new_send->list, &cm_node->recv_list);
 450                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
 451         }
 452         cm_core = cm_node->cm_core;
 453
 454         was_timer_set = timer_pending(&cm_core->tcp_timer);
 455
 456         if (!was_timer_set) {
 457                 cm_core->tcp_timer.expires = new_send->timetosend;
 458                 add_timer(&cm_core->tcp_timer);
 459         }
 460
 461         return ret;
 462 }
 463
 464
 465 /**
 466  * nes_cm_timer_tick
 467  */
 468 static void nes_cm_timer_tick(unsigned long pass)
 469 {
 470         unsigned long flags, qplockflags;
 471         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
 472         struct iw_cm_id *cm_id;
 473         struct nes_cm_node *cm_node;
 474         struct nes_timer_entry *send_entry, *recv_entry;
 475         struct list_head *list_core, *list_core_temp;
 476         struct list_head *list_node, *list_node_temp;
 477         struct nes_cm_core *cm_core = g_cm_core;
 478         struct nes_qp *nesqp;
 479         struct sk_buff *skb;
 480         u32 settimer = 0;
 481         int ret = NETDEV_TX_OK;
 482         int    node_done;
 483
 484         spin_lock_irqsave(&cm_core->ht_lock, flags);
 485
 486         list_for_each_safe(list_node, list_core_temp, &cm_core->connected_nodes) {
 487                 cm_node = container_of(list_node, struct nes_cm_node, list);
 488                 add_ref_cm_node(cm_node);
 489                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 490                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
 491                 list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
 492                         recv_entry = container_of(list_core, struct nes_timer_entry, list);
 493                         if ((time_after(recv_entry->timetosend, jiffies)) &&
 494                                         (recv_entry->type == NES_TIMER_TYPE_CLOSE)) {
 495                                 if (nexttimeout > recv_entry->timetosend || !settimer) {
 496                                         nexttimeout = recv_entry->timetosend;
 497                                         settimer = 1;
 498                                 }
 499                                 continue;
 500                         }
 501                         list_del(&recv_entry->list);
 502                         cm_id = cm_node->cm_id;
 503                         spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
 504                         if (recv_entry->type == NES_TIMER_TYPE_CLOSE) {
 505                                 nesqp = (struct nes_qp *)recv_entry->skb;
 506                                 spin_lock_irqsave(&nesqp->lock, qplockflags);
 507                                 if (nesqp->cm_id) {
 508                                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, refcount = %d: "
 509                                                         "****** HIT A NES_TIMER_TYPE_CLOSE"
 510                                                         " with something to do!!! ******\n",
 511                                                         nesqp->hwqp.qp_id, cm_id,
 512                                                         atomic_read(&nesqp->refcount));
 513                                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
 514                                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
 515                                         nesqp->ibqp_state = IB_QPS_ERR;
 516                                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 517                                         nes_cm_disconn(nesqp);
 518                                 } else {
 519                                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 520                                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, refcount = %d:"
 521                                                         " ****** HIT A NES_TIMER_TYPE_CLOSE"
 522                                                         " with nothing to do!!! ******\n",
 523                                                         nesqp->hwqp.qp_id, cm_id,
 524                                                         atomic_read(&nesqp->refcount));
 525                                         nes_rem_ref(&nesqp->ibqp);
 526                                 }
 527                                 if (cm_id)
 528                                         cm_id->rem_ref(cm_id);
 529                         }
 530                         kfree(recv_entry);
 531                         spin_lock_irqsave(&cm_node->recv_list_lock, flags);
 532                 }
 533                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
 534
 535                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 536                 node_done = 0;
 537                 list_for_each_safe(list_core, list_node_temp, &cm_node->retrans_list) {
 538                         if (node_done) {
 539                                 break;
 540                         }
 541                         send_entry = container_of(list_core, struct nes_timer_entry, list);
 542                         if (time_after(send_entry->timetosend, jiffies)) {
 543                                 if (cm_node->state != NES_CM_STATE_TSA) {
 544                                         if ((nexttimeout > send_entry->timetosend) || !settimer) {
 545                                                 nexttimeout = send_entry->timetosend;
 546                                                 settimer = 1;
 547                                         }
 548                                         node_done = 1;
 549                                         continue;
 550                                 } else {
 551                                         list_del(&send_entry->list);
 552                                         skb = send_entry->skb;
 553                                         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 554                                         dev_kfree_skb_any(skb);
 555                                         kfree(send_entry);
 556                                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 557                                         continue;
 558                                 }
 559                         }
 560                         if (send_entry->type == NES_TIMER_NODE_CLEANUP) {
 561                                 list_del(&send_entry->list);
 562                                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 563                                 kfree(send_entry);
 564                                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 565                                 continue;
 566                         }
 567                         if ((send_entry->seq_num < cm_node->tcp_cntxt.rem_ack_num) ||
 568                                         (cm_node->state == NES_CM_STATE_TSA) ||
 569                                         (cm_node->state == NES_CM_STATE_CLOSED)) {
 570                                 skb = send_entry->skb;
 571                                 list_del(&send_entry->list);
 572                                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 573                                 kfree(send_entry);
 574                                 dev_kfree_skb_any(skb);
 575                                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 576                                 continue;
 577                         }
 578
 579                         if (!send_entry->retranscount || !send_entry->retrycount) {
 580                                 cm_packets_dropped++;
 581                                 skb = send_entry->skb;
 582                                 list_del(&send_entry->list);
 583                                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 584                                 dev_kfree_skb_any(skb);
 585                                 kfree(send_entry);
 586                                 if (cm_node->state == NES_CM_STATE_SYN_RCVD) {
 587                                         /* this node never even generated an indication up to the cm */
 588                                         rem_ref_cm_node(cm_core, cm_node);
 589                                 } else {
 590                                         cm_node->state = NES_CM_STATE_CLOSED;
 591                                         create_event(cm_node, NES_CM_EVENT_ABORTED);
 592                                 }
 593                                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 594                                 continue;
 595                         }
 596                         /* this seems like the correct place, but leave send entry unprotected */
 597                         // spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 598                         atomic_inc(&send_entry->skb->users);
 599                         cm_packets_retrans++;
 600                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p for node %p,"
 601                                         " jiffies = %lu, time to send =  %lu, retranscount = %u, "
 602                                         "send_entry->seq_num = 0x%08X, cm_node->tcp_cntxt.rem_ack_num = 0x%08X\n",
 603                                         send_entry, cm_node, jiffies, send_entry->timetosend, send_entry->retranscount,
 604                                         send_entry->seq_num, cm_node->tcp_cntxt.rem_ack_num);
 605
 606                         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 607                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
 608                         if (ret != NETDEV_TX_OK) {
 609                                 cm_packets_bounced++;
 610                                 atomic_dec(&send_entry->skb->users);
 611                                 send_entry->retrycount--;
 612                                 nexttimeout = jiffies + NES_SHORT_TIME;
 613                                 settimer = 1;
 614                                 node_done = 1;
 615                                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 616                                 continue;
 617                         } else {
 618                                 cm_packets_sent++;
 619                         }
 620                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 621                         list_del(&send_entry->list);
 622                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = %u, retry count = %u.\n",
 623                                         send_entry->retranscount, send_entry->retrycount);
 624                         if (send_entry->send_retrans) {
 625                                 send_entry->retranscount--;
 626                                 send_entry->timetosend = jiffies + NES_RETRY_TIMEOUT;
 627                                 if (nexttimeout > send_entry->timetosend || !settimer) {
 628                                         nexttimeout = send_entry->timetosend;
 629                                         settimer = 1;
 630                                 }
 631                                 list_add(&send_entry->list, &cm_node->retrans_list);
 632                                 continue;
 633                         } else {
 634                                 int close_when_complete;
 635                                 skb = send_entry->skb;
 636                                 close_when_complete = send_entry->close_when_complete;
 637                                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 638                                 if (close_when_complete) {
 639                                         BUG_ON(atomic_read(&cm_node->ref_count) == 1);
 640                                         rem_ref_cm_node(cm_core, cm_node);
 641                                 }
 642                                 dev_kfree_skb_any(skb);
 643                                 kfree(send_entry);
 644                                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 645                                 continue;
 646                         }
 647                 }
 648                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 649
 650                 rem_ref_cm_node(cm_core, cm_node);
 651
 652                 spin_lock_irqsave(&cm_core->ht_lock, flags);
 653                 if (ret != NETDEV_TX_OK)
 654                         break;
 655         }
 656         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 657
 658         if (settimer) {
 659                 if (!timer_pending(&cm_core->tcp_timer)) {
 660                         cm_core->tcp_timer.expires  = nexttimeout;
 661                         add_timer(&cm_core->tcp_timer);
 662                 }
 663         }
 664 }
 665
 666
 667 /**
 668  * send_syn
 669  */
 670 static int send_syn(struct nes_cm_node *cm_node, u32 sendack)
 671 {
 672         int ret;
 673         int flags = SET_SYN;
 674         struct sk_buff *skb;
 675         char optionsbuffer[sizeof(struct option_mss) +
 676                         sizeof(struct option_windowscale) +
 677                         sizeof(struct option_base) + 1];
 678
 679         int optionssize = 0;
 680         /* Sending MSS option */
 681         union all_known_options *options;
 682
 683         if (!cm_node)
 684                 return -EINVAL;
 685
 686         options = (union all_known_options *)&optionsbuffer[optionssize];
 687         options->as_mss.optionnum = OPTION_NUMBER_MSS;
 688         options->as_mss.length = sizeof(struct option_mss);
 689         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
 690         optionssize += sizeof(struct option_mss);
 691
 692         options = (union all_known_options *)&optionsbuffer[optionssize];
 693         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
 694         options->as_windowscale.length = sizeof(struct option_windowscale);
 695         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
 696         optionssize += sizeof(struct option_windowscale);
 697
 698         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)
 699                         ) {
 700                 options = (union all_known_options *)&optionsbuffer[optionssize];
 701                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
 702                 options->as_base.length = sizeof(struct option_base);
 703                 optionssize += sizeof(struct option_base);
 704                 /* we need the size to be a multiple of 4 */
 705                 options = (union all_known_options *)&optionsbuffer[optionssize];
 706                 options->as_end = 1;
 707                 optionssize += 1;
 708                 options = (union all_known_options *)&optionsbuffer[optionssize];
 709                 options->as_end = 1;
 710                 optionssize += 1;
 711         }
 712
 713         options = (union all_known_options *)&optionsbuffer[optionssize];
 714         options->as_end = OPTION_NUMBER_END;
 715         optionssize += 1;
 716
 717         skb = get_free_pkt(cm_node);
 718         if (!skb) {
 719                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 720                 return -1;
 721         }
 722
 723         if (sendack)
 724                 flags |= SET_ACK;
 725
 726         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
 727         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 728
 729         return ret;
 730 }
 731
 732
 733 /**
 734  * send_reset
 735  */
 736 static int send_reset(struct nes_cm_node *cm_node)
 737 {
 738         int ret;
 739         struct sk_buff *skb = get_free_pkt(cm_node);
 740         int flags = SET_RST | SET_ACK;
 741
 742         if (!skb) {
 743                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 744                 return -1;
 745         }
 746
 747         add_ref_cm_node(cm_node);
 748         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
 749         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
 750
 751         return ret;
 752 }
 753
 754
 755 /**
 756  * send_ack
 757  */
 758 static int send_ack(struct nes_cm_node *cm_node)
 759 {
 760         int ret;
 761         struct sk_buff *skb = get_free_pkt(cm_node);
 762
 763         if (!skb) {
 764                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 765                 return -1;
 766         }
 767
 768         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
 769         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
 770
 771         return ret;
 772 }
 773
 774
 775 /**
 776  * send_fin
 777  */
 778 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
 779 {
 780         int ret;
 781
 782         /* if we didn't get a frame get one */
 783         if (!skb)
 784                 skb = get_free_pkt(cm_node);
 785
 786         if (!skb) {
 787                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 788                 return -1;
 789         }
 790
 791         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
 792         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 793
 794         return ret;
 795 }
 796
 797
 798 /**
 799  * get_free_pkt
 800  */
 801 static struct sk_buff *get_free_pkt(struct nes_cm_node *cm_node)
 802 {
 803         struct sk_buff *skb, *new_skb;
 804
 805         /* check to see if we need to repopulate the free tx pkt queue */
 806         if (skb_queue_len(&cm_node->cm_core->tx_free_list) < NES_CM_FREE_PKT_LO_WATERMARK) {
 807                 while (skb_queue_len(&cm_node->cm_core->tx_free_list) <
 808                                 cm_node->cm_core->free_tx_pkt_max) {
 809                         /* replace the frame we took, we won't get it back */
 810                         new_skb = dev_alloc_skb(cm_node->cm_core->mtu);
 811                         BUG_ON(!new_skb);
 812                         /* add a replacement frame to the free tx list head */
 813                         skb_queue_head(&cm_node->cm_core->tx_free_list, new_skb);
 814                 }
 815         }
 816
 817         skb = skb_dequeue(&cm_node->cm_core->tx_free_list);
 818
 819         return skb;
 820 }
 821
 822
 823 /**
 824  * make_hashkey - generate hash key from node tuple
 825  */
 826 static inline int make_hashkey(u16 loc_port, nes_addr_t loc_addr, u16 rem_port,
 827                 nes_addr_t rem_addr)
 828 {
 829         u32 hashkey = 0;
 830
 831         hashkey = loc_addr + rem_addr + loc_port + rem_port;
 832         hashkey = (hashkey % NES_CM_HASHTABLE_SIZE);
 833
 834         return hashkey;
 835 }
 836
 837
 838 /**
 839  * find_node - find a cm node that matches the reference cm node
 840  */
 841 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
 842                 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
 843 {
 844         unsigned long flags;
 845         u32 hashkey;
 846         struct list_head *list_pos;
 847         struct list_head *hte;
 848         struct nes_cm_node *cm_node;
 849
 850         /* make a hash index key for this packet */
 851         hashkey = make_hashkey(loc_port, loc_addr, rem_port, rem_addr);
 852
 853         /* get a handle on the hte */
 854         hte = &cm_core->connected_nodes;
 855
 856         nes_debug(NES_DBG_CM, "Searching for an owner node:%x:%x from core %p->%p\n",
 857                         loc_addr, loc_port, cm_core, hte);
 858
 859         /* walk list and find cm_node associated with this session ID */
 860         spin_lock_irqsave(&cm_core->ht_lock, flags);
 861         list_for_each(list_pos, hte) {
 862                 cm_node = container_of(list_pos, struct nes_cm_node, list);
 863                 /* compare quad, return node handle if a match */
 864                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
 865                                 cm_node->loc_addr, cm_node->loc_port,
 866                                 loc_addr, loc_port,
 867                                 cm_node->rem_addr, cm_node->rem_port,
 868                                 rem_addr, rem_port);
 869                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
 870                                 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
 871                         add_ref_cm_node(cm_node);
 872                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 873                         return cm_node;
 874                 }
 875         }
 876         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 877
 878         /* no owner node */
 879         return NULL;
 880 }
 881
 882
 883 /**
 884  * find_listener - find a cm node listening on this addr-port pair
 885  */
 886 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
 887                 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
 888 {
 889         unsigned long flags;
 890         struct list_head *listen_list;
 891         struct nes_cm_listener *listen_node;
 892
 893         /* walk list and find cm_node associated with this session ID */
 894         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 895         list_for_each(listen_list, &cm_core->listen_list.list) {
 896                 listen_node = container_of(listen_list, struct nes_cm_listener, list);
 897                 /* compare node pair, return node handle if a match */
 898                 if (((listen_node->loc_addr == dst_addr) ||
 899                                 listen_node->loc_addr == 0x00000000) &&
 900                                 (listen_node->loc_port == dst_port) &&
 901                                 (listener_state & listen_node->listener_state)) {
 902                         atomic_inc(&listen_node->ref_count);
 903                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 904                         return listen_node;
 905                 }
 906         }
 907         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 908
 909         nes_debug(NES_DBG_CM, "Unable to find listener- %x:%x\n",
 910                         dst_addr, dst_port);
 911
 912         /* no listener */
 913         return NULL;
 914 }
 915
 916
 917 /**
 918  * add_hte_node - add a cm node to the hash table
 919  */
 920 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
 921 {
 922         unsigned long flags;
 923         u32 hashkey;
 924         struct list_head *hte;
 925
 926         if (!cm_node || !cm_core)
 927                 return -EINVAL;
 928
 929         nes_debug(NES_DBG_CM, "Adding Node to Active Connection HT\n");
 930
 931         /* first, make an index into our hash table */
 932         hashkey = make_hashkey(cm_node->loc_port, cm_node->loc_addr,
 933                         cm_node->rem_port, cm_node->rem_addr);
 934         cm_node->hashkey = hashkey;
 935
 936         spin_lock_irqsave(&cm_core->ht_lock, flags);
 937
 938         /* get a handle on the hash table element (list head for this slot) */
 939         hte = &cm_core->connected_nodes;
 940         list_add_tail(&cm_node->list, hte);
 941         atomic_inc(&cm_core->ht_node_cnt);
 942
 943         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 944
 945         return 0;
 946 }
 947
 948
 949 /**
 950  * mini_cm_dec_refcnt_listen
 951  */
 952 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
 953                 struct nes_cm_listener *listener, int free_hanging_nodes)
 954 {
 955         int ret = 1;
 956         unsigned long flags;
 957         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 958         if (!atomic_dec_return(&listener->ref_count)) {
 959                 list_del(&listener->list);
 960
 961                 /* decrement our listen node count */
 962                 atomic_dec(&cm_core->listen_node_cnt);
 963
 964                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 965
 966                 if (listener->nesvnic) {
 967                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
 968                                         PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
 969                 }
 970
 971                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
 972
 973                 kfree(listener);
 974                 listener = NULL;
 975                 ret = 0;
 976                 cm_listens_destroyed++;
 977         } else {
 978                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 979         }
 980         if (listener) {
 981                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
 982                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
 983                                         " with non-zero pending accepts=%u\n",
 984                                         listener, atomic_read(&listener->pend_accepts_cnt));
 985         }
 986
 987         return ret;
 988 }
 989
 990
 991 /**
 992  * mini_cm_del_listen
 993  */
 994 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
 995                 struct nes_cm_listener *listener)
 996 {
 997         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
 998         listener->cm_id = NULL; /* going to be destroyed pretty soon */
 999         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1000 }
1001
1002
1003 /**
1004  * mini_cm_accelerated
1005  */
1006 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1007                 struct nes_cm_node *cm_node)
1008 {
1009         u32 was_timer_set;
1010         cm_node->accelerated = 1;
1011
1012         if (cm_node->accept_pend) {
1013                 BUG_ON(!cm_node->listener);
1014                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1015                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1016         }
1017
1018         was_timer_set = timer_pending(&cm_core->tcp_timer);
1019         if (!was_timer_set) {
1020                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1021                 add_timer(&cm_core->tcp_timer);
1022         }
1023
1024         return 0;
1025 }
1026
1027
1028 /**
1029  * nes_addr_send_arp
1030  */
1031 static void nes_addr_send_arp(u32 dst_ip)
1032 {
1033         struct rtable *rt;
1034         struct flowi fl;
1035
1036         memset(&fl, 0, sizeof fl);
1037         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1038         if (ip_route_output_key(&init_net, &rt, &fl)) {
1039                 printk("%s: ip_route_output_key failed for 0x%08X\n",
1040                                 __func__, dst_ip);
1041                 return;
1042         }
1043
1044         neigh_event_send(rt->u.dst.neighbour, NULL);
1045         ip_rt_put(rt);
1046 }
1047
1048
1049 /**
1050  * make_cm_node - create a new instance of a cm node
1051  */
1052 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1053                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1054                 struct nes_cm_listener *listener)
1055 {
1056         struct nes_cm_node *cm_node;
1057         struct timespec ts;
1058         int arpindex = 0;
1059         struct nes_device *nesdev;
1060         struct nes_adapter *nesadapter;
1061
1062         /* create an hte and cm_node for this instance */
1063         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1064         if (!cm_node)
1065                 return NULL;
1066
1067         /* set our node specific transport info */
1068         cm_node->loc_addr = cm_info->loc_addr;
1069         cm_node->rem_addr = cm_info->rem_addr;
1070         cm_node->loc_port = cm_info->loc_port;
1071         cm_node->rem_port = cm_info->rem_port;
1072         cm_node->send_write0 = send_first;
1073         nes_debug(NES_DBG_CM, "Make node addresses : loc = %x:%x, rem = %x:%x\n",
1074                         cm_node->loc_addr, cm_node->loc_port, cm_node->rem_addr, cm_node->rem_port);
1075         cm_node->listener = listener;
1076         cm_node->netdev = nesvnic->netdev;
1077         cm_node->cm_id = cm_info->cm_id;
1078         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1079
1080         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n",
1081                         cm_node->listener, cm_node->cm_id);
1082
1083         INIT_LIST_HEAD(&cm_node->retrans_list);
1084         spin_lock_init(&cm_node->retrans_list_lock);
1085         INIT_LIST_HEAD(&cm_node->recv_list);
1086         spin_lock_init(&cm_node->recv_list_lock);
1087
1088         cm_node->loopbackpartner = NULL;
1089         atomic_set(&cm_node->ref_count, 1);
1090         /* associate our parent CM core */
1091         cm_node->cm_core = cm_core;
1092         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1093         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1094         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1095                         NES_CM_DEFAULT_RCV_WND_SCALE;
1096         ts = current_kernel_time();
1097         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1098         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1099                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1100         cm_node->tcp_cntxt.rcv_nxt = 0;
1101         /* get a unique session ID , add thread_id to an upcounter to handle race */
1102         atomic_inc(&cm_core->node_cnt);
1103         cm_node->conn_type = cm_info->conn_type;
1104         cm_node->apbvt_set = 0;
1105         cm_node->accept_pend = 0;
1106
1107         cm_node->nesvnic = nesvnic;
1108         /* get some device handles, for arp lookup */
1109         nesdev = nesvnic->nesdev;
1110         nesadapter = nesdev->nesadapter;
1111
1112         cm_node->loopbackpartner = NULL;
1113         /* get the mac addr for the remote node */
1114         arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1115         if (arpindex < 0) {
1116                 kfree(cm_node);
1117                 nes_addr_send_arp(cm_info->rem_addr);
1118                 return NULL;
1119         }
1120
1121         /* copy the mac addr to node context */
1122         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1123         nes_debug(NES_DBG_CM, "Remote mac addr from arp table:%02x,"
1124                         " %02x, %02x, %02x, %02x, %02x\n",
1125                         cm_node->rem_mac[0], cm_node->rem_mac[1],
1126                         cm_node->rem_mac[2], cm_node->rem_mac[3],
1127                         cm_node->rem_mac[4], cm_node->rem_mac[5]);
1128
1129         add_hte_node(cm_core, cm_node);
1130         atomic_inc(&cm_nodes_created);
1131
1132         return cm_node;
1133 }
1134
1135
1136 /**
1137  * add_ref_cm_node - destroy an instance of a cm node
1138  */
1139 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1140 {
1141         atomic_inc(&cm_node->ref_count);
1142         return 0;
1143 }
1144
1145
1146 /**
1147  * rem_ref_cm_node - destroy an instance of a cm node
1148  */
1149 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1150                 struct nes_cm_node *cm_node)
1151 {
1152         unsigned long flags, qplockflags;
1153         struct nes_timer_entry *send_entry;
1154         struct nes_timer_entry *recv_entry;
1155         struct iw_cm_id *cm_id;
1156         struct list_head *list_core, *list_node_temp;
1157         struct nes_qp *nesqp;
1158
1159         if (!cm_node)
1160                 return -EINVAL;
1161
1162         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1163         if (atomic_dec_return(&cm_node->ref_count)) {
1164                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1165                 return 0;
1166         }
1167         list_del(&cm_node->list);
1168         atomic_dec(&cm_core->ht_node_cnt);
1169         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1170
1171         /* if the node is destroyed before connection was accelerated */
1172         if (!cm_node->accelerated && cm_node->accept_pend) {
1173                 BUG_ON(!cm_node->listener);
1174                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1175                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1176         }
1177
1178         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1179         list_for_each_safe(list_core, list_node_temp, &cm_node->retrans_list) {
1180                 send_entry = container_of(list_core, struct nes_timer_entry, list);
1181                 list_del(&send_entry->list);
1182                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1183                 dev_kfree_skb_any(send_entry->skb);
1184                 kfree(send_entry);
1185                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1186                 continue;
1187         }
1188         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1189
1190         spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1191         list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
1192                 recv_entry = container_of(list_core, struct nes_timer_entry, list);
1193                 list_del(&recv_entry->list);
1194                 cm_id = cm_node->cm_id;
1195                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1196                 if (recv_entry->type == NES_TIMER_TYPE_CLOSE) {
1197                         nesqp = (struct nes_qp *)recv_entry->skb;
1198                         spin_lock_irqsave(&nesqp->lock, qplockflags);
1199                         if (nesqp->cm_id) {
1200                                 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: ****** HIT A NES_TIMER_TYPE_CLOSE"
1201                                                 " with something to do!!! ******\n",
1202                                                 nesqp->hwqp.qp_id, cm_id);
1203                                 nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
1204                                 nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
1205                                 nesqp->ibqp_state = IB_QPS_ERR;
1206                                 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1207                                 nes_cm_disconn(nesqp);
1208                         } else {
1209                                 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1210                                 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: ****** HIT A NES_TIMER_TYPE_CLOSE"
1211                                                 " with nothing to do!!! ******\n",
1212                                                 nesqp->hwqp.qp_id, cm_id);
1213                                 nes_rem_ref(&nesqp->ibqp);
1214                         }
1215                         cm_id->rem_ref(cm_id);
1216                 } else if (recv_entry->type == NES_TIMER_TYPE_RECV) {
1217                         dev_kfree_skb_any(recv_entry->skb);
1218                 }
1219                 kfree(recv_entry);
1220                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1221         }
1222         spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1223
1224         if (cm_node->listener) {
1225                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1226         } else {
1227                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1228                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1229                                         PCI_FUNC(cm_node->nesvnic->nesdev->pcidev->devfn),
1230                                         NES_MANAGE_APBVT_DEL);
1231                 }
1232         }
1233
1234         kfree(cm_node);
1235         atomic_dec(&cm_core->node_cnt);
1236         atomic_inc(&cm_nodes_destroyed);
1237
1238         return 0;
1239 }
1240
1241
1242 /**
1243  * process_options
1244  */
1245 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc, u32 optionsize, u32 syn_packet)
1246 {
1247         u32 tmp;
1248         u32 offset = 0;
1249         union all_known_options *all_options;
1250         char got_mss_option = 0;
1251
1252         while (offset < optionsize) {
1253                 all_options = (union all_known_options *)(optionsloc + offset);
1254                 switch (all_options->as_base.optionnum) {
1255                         case OPTION_NUMBER_END:
1256                                 offset = optionsize;
1257                                 break;
1258                         case OPTION_NUMBER_NONE:
1259                                 offset += 1;
1260                                 continue;
1261                         case OPTION_NUMBER_MSS:
1262                                 nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d Size: %d\n",
1263                                                 __func__,
1264                                                 all_options->as_mss.length, offset, optionsize);
1265                                 got_mss_option = 1;
1266                                 if (all_options->as_mss.length != 4) {
1267                                         return 1;
1268                                 } else {
1269                                         tmp = ntohs(all_options->as_mss.mss);
1270                                         if (tmp > 0 && tmp < cm_node->tcp_cntxt.mss)
1271                                                 cm_node->tcp_cntxt.mss = tmp;
1272                                 }
1273                                 break;
1274                         case OPTION_NUMBER_WINDOW_SCALE:
1275                                 cm_node->tcp_cntxt.snd_wscale = all_options->as_windowscale.shiftcount;
1276                                 break;
1277                         case OPTION_NUMBER_WRITE0:
1278                                 cm_node->send_write0 = 1;
1279                                 break;
1280                         default:
1281                                 nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1282                                                 all_options->as_base.optionnum);
1283                                 break;
1284                 }
1285                 offset += all_options->as_base.length;
1286         }
1287         if ((!got_mss_option) && (syn_packet))
1288                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1289         return 0;
1290 }
1291
1292
1293 /**
1294  * process_packet
1295  */
1296 static int process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1297                           struct nes_cm_core *cm_core)
1298 {
1299         int optionsize;
1300         int datasize;
1301         int ret = 0;
1302         struct tcphdr *tcph = tcp_hdr(skb);
1303         u32 inc_sequence;
1304         if (cm_node->state == NES_CM_STATE_SYN_SENT && tcph->syn) {
1305                 inc_sequence = ntohl(tcph->seq);
1306                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence;
1307         }
1308
1309         if ((!tcph) || (cm_node->state == NES_CM_STATE_TSA)) {
1310                 BUG_ON(!tcph);
1311                 atomic_inc(&cm_accel_dropped_pkts);
1312                 return -1;
1313         }
1314
1315         if (tcph->rst) {
1316                 atomic_inc(&cm_resets_recvd);
1317                 nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u. refcnt=%d\n",
1318                                 cm_node, cm_node->state, atomic_read(&cm_node->ref_count));
1319                 switch (cm_node->state) {
1320                         case NES_CM_STATE_LISTENING:
1321                                 rem_ref_cm_node(cm_core, cm_node);
1322                                 break;
1323                         case NES_CM_STATE_TSA:
1324                         case NES_CM_STATE_CLOSED:
1325                                 break;
1326                         case NES_CM_STATE_SYN_RCVD:
1327                                         nes_debug(NES_DBG_CM, "Received a reset for local 0x%08X:%04X,"
1328                                                         " remote 0x%08X:%04X, node state = %u\n",
1329                                                         cm_node->loc_addr, cm_node->loc_port,
1330                                                         cm_node->rem_addr, cm_node->rem_port,
1331                                                         cm_node->state);
1332                                 rem_ref_cm_node(cm_core, cm_node);
1333                                 break;
1334                         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1335                         case NES_CM_STATE_ESTABLISHED:
1336                         case NES_CM_STATE_MPAREQ_SENT:
1337                         default:
1338                                         nes_debug(NES_DBG_CM, "Received a reset for local 0x%08X:%04X,"
1339                                                         " remote 0x%08X:%04X, node state = %u refcnt=%d\n",
1340                                                         cm_node->loc_addr, cm_node->loc_port,
1341                                                         cm_node->rem_addr, cm_node->rem_port,
1342                                                         cm_node->state, atomic_read(&cm_node->ref_count));
1343                                 // create event
1344                                 cm_node->state = NES_CM_STATE_CLOSED;
1345
1346                                 create_event(cm_node, NES_CM_EVENT_ABORTED);
1347                                 break;
1348
1349                 }
1350                 return -1;
1351         }
1352
1353         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1354
1355         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1356         skb_pull(skb, tcph->doff << 2);
1357
1358         datasize = skb->len;
1359         inc_sequence = ntohl(tcph->seq);
1360         nes_debug(NES_DBG_CM, "datasize = %u, sequence = 0x%08X, ack_seq = 0x%08X,"
1361                         " rcv_nxt = 0x%08X Flags: %s %s.\n",
1362                         datasize, inc_sequence, ntohl(tcph->ack_seq),
1363                         cm_node->tcp_cntxt.rcv_nxt, (tcph->syn ? "SYN":""),
1364                         (tcph->ack ? "ACK":""));
1365
1366         if (!tcph->syn && (inc_sequence != cm_node->tcp_cntxt.rcv_nxt)
1367                 ) {
1368                 nes_debug(NES_DBG_CM, "dropping packet, datasize = %u, sequence = 0x%08X,"
1369                                 " ack_seq = 0x%08X, rcv_nxt = 0x%08X Flags: %s.\n",
1370                                 datasize, inc_sequence, ntohl(tcph->ack_seq),
1371                                 cm_node->tcp_cntxt.rcv_nxt, (tcph->ack ? "ACK":""));
1372                 if (cm_node->state == NES_CM_STATE_LISTENING) {
1373                         rem_ref_cm_node(cm_core, cm_node);
1374                 }
1375                 return -1;
1376         }
1377
1378                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1379
1380
1381         if (optionsize) {
1382                 u8 *optionsloc = (u8 *)&tcph[1];
1383                 if (process_options(cm_node, optionsloc, optionsize, (u32)tcph->syn)) {
1384                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n", __func__, cm_node);
1385                         send_reset(cm_node);
1386                         if (cm_node->state != NES_CM_STATE_SYN_SENT)
1387                         rem_ref_cm_node(cm_core, cm_node);
1388                         return 0;
1389                 }
1390         } else if (tcph->syn)
1391                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1392
1393         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1394                         cm_node->tcp_cntxt.snd_wscale;
1395
1396         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd) {
1397                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1398         }
1399
1400         if (tcph->ack) {
1401                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1402                 switch (cm_node->state) {
1403                         case NES_CM_STATE_SYN_RCVD:
1404                         case NES_CM_STATE_SYN_SENT:
1405                                 /* read and stash current sequence number */
1406                                 if (cm_node->tcp_cntxt.rem_ack_num != cm_node->tcp_cntxt.loc_seq_num) {
1407                                         nes_debug(NES_DBG_CM, "ERROR - cm_node->tcp_cntxt.rem_ack_num !="
1408                                                         " cm_node->tcp_cntxt.loc_seq_num\n");
1409                                         send_reset(cm_node);
1410                                         return 0;
1411                                 }
1412                                 if (cm_node->state == NES_CM_STATE_SYN_SENT)
1413                                         cm_node->state = NES_CM_STATE_ONE_SIDE_ESTABLISHED;
1414                                 else {
1415                                                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1416                                 }
1417                                 break;
1418                         case NES_CM_STATE_LAST_ACK:
1419                                 cm_node->state = NES_CM_STATE_CLOSED;
1420                                 break;
1421                         case NES_CM_STATE_FIN_WAIT1:
1422                                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1423                                 break;
1424                         case NES_CM_STATE_CLOSING:
1425                                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1426                                 /* need to schedule this to happen in 2MSL timeouts */
1427                                 cm_node->state = NES_CM_STATE_CLOSED;
1428                                 break;
1429                         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1430                         case NES_CM_STATE_ESTABLISHED:
1431                         case NES_CM_STATE_MPAREQ_SENT:
1432                         case NES_CM_STATE_CLOSE_WAIT:
1433                         case NES_CM_STATE_TIME_WAIT:
1434                         case NES_CM_STATE_CLOSED:
1435                                 break;
1436                         case NES_CM_STATE_LISTENING:
1437                                 nes_debug(NES_DBG_CM, "Received an ACK on a listening port (SYN %d)\n", tcph->syn);
1438                                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1439                                 send_reset(cm_node);
1440                                 /* send_reset bumps refcount, this should have been a new node */
1441                                 rem_ref_cm_node(cm_core, cm_node);
1442                                 return -1;
1443                                 break;
1444                         case NES_CM_STATE_TSA:
1445                                 nes_debug(NES_DBG_CM, "Received a packet with the ack bit set while in TSA state\n");
1446                                 break;
1447                         case NES_CM_STATE_UNKNOWN:
1448                         case NES_CM_STATE_INITED:
1449                         case NES_CM_STATE_ACCEPTING:
1450                         case NES_CM_STATE_FIN_WAIT2:
1451                         default:
1452                                 nes_debug(NES_DBG_CM, "Received ack from unknown state: %x\n",
1453                                                 cm_node->state);
1454                                 send_reset(cm_node);
1455                                 break;
1456                 }
1457         }
1458
1459         if (tcph->syn) {
1460                 if (cm_node->state == NES_CM_STATE_LISTENING) {
1461                         /* do not exceed backlog */
1462                         atomic_inc(&cm_node->listener->pend_accepts_cnt);
1463                         if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1464                                         cm_node->listener->backlog) {
1465                                 nes_debug(NES_DBG_CM, "drop syn due to backlog pressure \n");
1466                                 cm_backlog_drops++;
1467                                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1468                                 rem_ref_cm_node(cm_core, cm_node);
1469                                 return 0;
1470                         }
1471                         cm_node->accept_pend = 1;
1472
1473                 }
1474                 if (datasize == 0)
1475                         cm_node->tcp_cntxt.rcv_nxt ++;
1476
1477                 if (cm_node->state == NES_CM_STATE_LISTENING) {
1478                         cm_node->state = NES_CM_STATE_SYN_RCVD;
1479                         send_syn(cm_node, 1);
1480                 }
1481                 if (cm_node->state == NES_CM_STATE_ONE_SIDE_ESTABLISHED) {
1482                         cm_node->state = NES_CM_STATE_ESTABLISHED;
1483                         /* send final handshake ACK */
1484                         ret = send_ack(cm_node);
1485                         if (ret < 0)
1486                                 return ret;
1487
1488                                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1489                                 ret = send_mpa_request(cm_node);
1490                                 if (ret < 0)
1491                                         return ret;
1492                 }
1493         }
1494
1495         if (tcph->fin) {
1496                 cm_node->tcp_cntxt.rcv_nxt++;
1497                 switch (cm_node->state) {
1498                         case NES_CM_STATE_SYN_RCVD:
1499                         case NES_CM_STATE_SYN_SENT:
1500                         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1501                         case NES_CM_STATE_ESTABLISHED:
1502                         case NES_CM_STATE_ACCEPTING:
1503                         case NES_CM_STATE_MPAREQ_SENT:
1504                                 cm_node->state = NES_CM_STATE_CLOSE_WAIT;
1505                                 cm_node->state = NES_CM_STATE_LAST_ACK;
1506                                 ret = send_fin(cm_node, NULL);
1507                                 break;
1508                         case NES_CM_STATE_FIN_WAIT1:
1509                                 cm_node->state = NES_CM_STATE_CLOSING;
1510                                 ret = send_ack(cm_node);
1511                                 break;
1512                         case NES_CM_STATE_FIN_WAIT2:
1513                                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1514                                 cm_node->tcp_cntxt.loc_seq_num ++;
1515                                 ret = send_ack(cm_node);
1516                                 /* need to schedule this to happen in 2MSL timeouts */
1517                                 cm_node->state = NES_CM_STATE_CLOSED;
1518                                 break;
1519                         case NES_CM_STATE_CLOSE_WAIT:
1520                         case NES_CM_STATE_LAST_ACK:
1521                         case NES_CM_STATE_CLOSING:
1522                         case NES_CM_STATE_TSA:
1523                         default:
1524                                 nes_debug(NES_DBG_CM, "Received a fin while in %x state\n",
1525                                                 cm_node->state);
1526                                 ret = -EINVAL;
1527                                 break;
1528                 }
1529         }
1530
1531         if (datasize) {
1532                 u8 *dataloc = skb->data;
1533                 /* figure out what state we are in and handle transition to next state */
1534                 switch (cm_node->state) {
1535                         case NES_CM_STATE_LISTENING:
1536                         case NES_CM_STATE_SYN_RCVD:
1537                         case NES_CM_STATE_SYN_SENT:
1538                         case NES_CM_STATE_FIN_WAIT1:
1539                         case NES_CM_STATE_FIN_WAIT2:
1540                         case NES_CM_STATE_CLOSE_WAIT:
1541                         case NES_CM_STATE_LAST_ACK:
1542                         case NES_CM_STATE_CLOSING:
1543                                 break;
1544                         case  NES_CM_STATE_MPAREQ_SENT:
1545                                 /* recv the mpa res frame, ret=frame len (incl priv data) */
1546                                 ret = parse_mpa(cm_node, dataloc, datasize);
1547                                 if (ret < 0)
1548                                         break;
1549                                 /* set the req frame payload len in skb */
1550                                 /* we are done handling this state, set node to a TSA state */
1551                                 cm_node->state = NES_CM_STATE_TSA;
1552                                 send_ack(cm_node);
1553                                 create_event(cm_node, NES_CM_EVENT_CONNECTED);
1554                                 break;
1555
1556                         case  NES_CM_STATE_ESTABLISHED:
1557                                 /* we are expecting an MPA req frame */
1558                                 ret = parse_mpa(cm_node, dataloc, datasize);
1559                                 if (ret < 0) {
1560                                         break;
1561                                 }
1562                                 cm_node->state = NES_CM_STATE_TSA;
1563                                 send_ack(cm_node);
1564                                 /* we got a valid MPA request, create an event */
1565                                 create_event(cm_node, NES_CM_EVENT_MPA_REQ);
1566                                 break;
1567                         case  NES_CM_STATE_TSA:
1568                                 handle_exception_pkt(cm_node, skb);
1569                                 break;
1570                         case NES_CM_STATE_UNKNOWN:
1571                         case NES_CM_STATE_INITED:
1572                         default:
1573                                 ret = -1;
1574                 }
1575         }
1576
1577         return ret;
1578 }
1579
1580
1581 /**
1582  * mini_cm_listen - create a listen node with params
1583  */
1584 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1585                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1586 {
1587         struct nes_cm_listener *listener;
1588         unsigned long flags;
1589
1590         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1591                 cm_info->loc_addr, cm_info->loc_port);
1592
1593         /* cannot have multiple matching listeners */
1594         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1595                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1596         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1597                 /* find automatically incs ref count ??? */
1598                 atomic_dec(&listener->ref_count);
1599                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1600                 return NULL;
1601         }
1602
1603         if (!listener) {
1604                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1605                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1606                 if (!listener) {
1607                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1608                         return NULL;
1609                 }
1610
1611                 memset(listener, 0, sizeof(struct nes_cm_listener));
1612                 listener->loc_addr = htonl(cm_info->loc_addr);
1613                 listener->loc_port = htons(cm_info->loc_port);
1614                 listener->reused_node = 0;
1615
1616                 atomic_set(&listener->ref_count, 1);
1617         }
1618         /* pasive case */
1619         /* find already inc'ed the ref count */
1620         else {
1621                 listener->reused_node = 1;
1622         }
1623
1624         listener->cm_id = cm_info->cm_id;
1625         atomic_set(&listener->pend_accepts_cnt, 0);
1626         listener->cm_core = cm_core;
1627         listener->nesvnic = nesvnic;
1628         atomic_inc(&cm_core->node_cnt);
1629
1630         listener->conn_type = cm_info->conn_type;
1631         listener->backlog = cm_info->backlog;
1632         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1633
1634         if (!listener->reused_node) {
1635                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1636                 list_add(&listener->list, &cm_core->listen_list.list);
1637                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1638                 atomic_inc(&cm_core->listen_node_cnt);
1639         }
1640
1641         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
1642                         " listener = %p, backlog = %d, cm_id = %p.\n",
1643                         cm_info->loc_addr, cm_info->loc_port,
1644                         listener, listener->backlog, listener->cm_id);
1645
1646         return listener;
1647 }
1648
1649
1650 /**
1651  * mini_cm_connect - make a connection node with params
1652  */
1653 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1654                                            struct nes_vnic *nesvnic,
1655                                            struct ietf_mpa_frame *mpa_frame,
1656                                            struct nes_cm_info *cm_info)
1657 {
1658         int ret = 0;
1659         struct nes_cm_node *cm_node;
1660         struct nes_cm_listener *loopbackremotelistener;
1661         struct nes_cm_node *loopbackremotenode;
1662         struct nes_cm_info loopback_cm_info;
1663
1664         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) +
1665                         ntohs(mpa_frame->priv_data_len);
1666
1667         cm_info->loc_addr = htonl(cm_info->loc_addr);
1668         cm_info->rem_addr = htonl(cm_info->rem_addr);
1669         cm_info->loc_port = htons(cm_info->loc_port);
1670         cm_info->rem_port = htons(cm_info->rem_port);
1671
1672         /* create a CM connection node */
1673         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
1674         if (!cm_node)
1675                 return NULL;
1676
1677         // set our node side to client (active) side
1678         cm_node->tcp_cntxt.client = 1;
1679         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1680
1681         if (cm_info->loc_addr == cm_info->rem_addr) {
1682                 loopbackremotelistener = find_listener(cm_core, cm_node->rem_addr,
1683                                 cm_node->rem_port, NES_CM_LISTENER_ACTIVE_STATE);
1684                 if (loopbackremotelistener == NULL) {
1685                         create_event(cm_node, NES_CM_EVENT_ABORTED);
1686                 } else {
1687                         atomic_inc(&cm_loopbacks);
1688                         loopback_cm_info = *cm_info;
1689                         loopback_cm_info.loc_port = cm_info->rem_port;
1690                         loopback_cm_info.rem_port = cm_info->loc_port;
1691                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
1692                         loopbackremotenode = make_cm_node(cm_core, nesvnic, &loopback_cm_info,
1693                                         loopbackremotelistener);
1694                         loopbackremotenode->loopbackpartner = cm_node;
1695                         loopbackremotenode->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1696                         cm_node->loopbackpartner = loopbackremotenode;
1697                         memcpy(loopbackremotenode->mpa_frame_buf, &mpa_frame->priv_data,
1698                                         mpa_frame_size);
1699                         loopbackremotenode->mpa_frame_size = mpa_frame_size -
1700                                         sizeof(struct ietf_mpa_frame);
1701
1702                         // we are done handling this state, set node to a TSA state
1703                         cm_node->state = NES_CM_STATE_TSA;
1704                         cm_node->tcp_cntxt.rcv_nxt = loopbackremotenode->tcp_cntxt.loc_seq_num;
1705                         loopbackremotenode->tcp_cntxt.rcv_nxt = cm_node->tcp_cntxt.loc_seq_num;
1706                         cm_node->tcp_cntxt.max_snd_wnd = loopbackremotenode->tcp_cntxt.rcv_wnd;
1707                         loopbackremotenode->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
1708                         cm_node->tcp_cntxt.snd_wnd = loopbackremotenode->tcp_cntxt.rcv_wnd;
1709                         loopbackremotenode->tcp_cntxt.snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
1710                         cm_node->tcp_cntxt.snd_wscale = loopbackremotenode->tcp_cntxt.rcv_wscale;
1711                         loopbackremotenode->tcp_cntxt.snd_wscale = cm_node->tcp_cntxt.rcv_wscale;
1712
1713                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
1714                 }
1715                 return cm_node;
1716         }
1717
1718         /* set our node side to client (active) side */
1719         cm_node->tcp_cntxt.client = 1;
1720         /* init our MPA frame ptr */
1721         memcpy(&cm_node->mpa_frame, mpa_frame, mpa_frame_size);
1722         cm_node->mpa_frame_size = mpa_frame_size;
1723
1724         /* send a syn and goto syn sent state */
1725         cm_node->state = NES_CM_STATE_SYN_SENT;
1726         ret = send_syn(cm_node, 0);
1727
1728         nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X, port=0x%04x,"
1729                         " cm_node=%p, cm_id = %p.\n",
1730                         cm_node->rem_addr, cm_node->rem_port, cm_node, cm_node->cm_id);
1731
1732         return cm_node;
1733 }
1734
1735
1736 /**
1737  * mini_cm_accept - accept a connection
1738  * This function is never called
1739  */
1740 static int mini_cm_accept(struct nes_cm_core *cm_core, struct ietf_mpa_frame *mpa_frame,
1741                           struct nes_cm_node *cm_node)
1742 {
1743         return 0;
1744 }
1745
1746
1747 /**
1748  * mini_cm_reject - reject and teardown a connection
1749  */
1750 static int mini_cm_reject(struct nes_cm_core *cm_core,
1751                           struct ietf_mpa_frame *mpa_frame,
1752                           struct nes_cm_node *cm_node)
1753 {
1754         int ret = 0;
1755         struct sk_buff *skb;
1756         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) +
1757                         ntohs(mpa_frame->priv_data_len);
1758
1759         skb = get_free_pkt(cm_node);
1760         if (!skb) {
1761                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1762                 return -1;
1763         }
1764
1765         /* send an MPA Request frame */
1766         form_cm_frame(skb, cm_node, NULL, 0, mpa_frame, mpa_frame_size, SET_ACK | SET_FIN);
1767         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1768
1769         cm_node->state = NES_CM_STATE_CLOSED;
1770         ret = send_fin(cm_node, NULL);
1771
1772         if (ret < 0) {
1773                 printk(KERN_INFO PFX "failed to send MPA Reply (reject)\n");
1774                 return ret;
1775         }
1776
1777         return ret;
1778 }
1779
1780
1781 /**
1782  * mini_cm_close
1783  */
1784 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1785 {
1786         int ret = 0;
1787
1788         if (!cm_core || !cm_node)
1789                 return -EINVAL;
1790
1791         switch (cm_node->state) {
1792                 /* if passed in node is null, create a reference key node for node search */
1793                 /* check if we found an owner node for this pkt */
1794                 case NES_CM_STATE_SYN_RCVD:
1795                 case NES_CM_STATE_SYN_SENT:
1796                 case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1797                 case NES_CM_STATE_ESTABLISHED:
1798                 case NES_CM_STATE_ACCEPTING:
1799                 case NES_CM_STATE_MPAREQ_SENT:
1800                         cm_node->state = NES_CM_STATE_FIN_WAIT1;
1801                         send_fin(cm_node, NULL);
1802                         break;
1803                 case NES_CM_STATE_CLOSE_WAIT:
1804                         cm_node->state = NES_CM_STATE_LAST_ACK;
1805                         send_fin(cm_node, NULL);
1806                         break;
1807                 case NES_CM_STATE_FIN_WAIT1:
1808                 case NES_CM_STATE_FIN_WAIT2:
1809                 case NES_CM_STATE_LAST_ACK:
1810                 case NES_CM_STATE_TIME_WAIT:
1811                 case NES_CM_STATE_CLOSING:
1812                         ret = -1;
1813                         break;
1814                 case NES_CM_STATE_LISTENING:
1815                 case NES_CM_STATE_UNKNOWN:
1816                 case NES_CM_STATE_INITED:
1817                 case NES_CM_STATE_CLOSED:
1818                 case NES_CM_STATE_TSA:
1819                         ret = rem_ref_cm_node(cm_core, cm_node);
1820                         break;
1821         }
1822         cm_node->cm_id = NULL;
1823         return ret;
1824 }
1825
1826
1827 /**
1828  * recv_pkt - recv an ETHERNET packet, and process it through CM
1829  * node state machine
1830  */
1831 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core, struct nes_vnic *nesvnic,
1832                             struct sk_buff *skb)
1833 {
1834         struct nes_cm_node *cm_node = NULL;
1835         struct nes_cm_listener *listener = NULL;
1836         struct iphdr *iph;
1837         struct tcphdr *tcph;
1838         struct nes_cm_info nfo;
1839         int ret = 0;
1840
1841         if (!skb || skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
1842                 ret = -EINVAL;
1843                 goto out;
1844         }
1845
1846         iph = (struct iphdr *)skb->data;
1847         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
1848         skb_reset_network_header(skb);
1849         skb_set_transport_header(skb, sizeof(*tcph));
1850         skb->len = ntohs(iph->tot_len);
1851
1852         nfo.loc_addr = ntohl(iph->daddr);
1853         nfo.loc_port = ntohs(tcph->dest);
1854         nfo.rem_addr = ntohl(iph->saddr);
1855         nfo.rem_port = ntohs(tcph->source);
1856
1857         nes_debug(NES_DBG_CM, "Received packet: dest=0x%08X:0x%04X src=0x%08X:0x%04X\n",
1858                         iph->daddr, tcph->dest, iph->saddr, tcph->source);
1859
1860         /* note: this call is going to increment cm_node ref count */
1861         cm_node = find_node(cm_core,
1862                         nfo.rem_port, nfo.rem_addr,
1863                         nfo.loc_port, nfo.loc_addr);
1864
1865         if (!cm_node) {
1866                 listener = find_listener(cm_core, nfo.loc_addr, nfo.loc_port,
1867                                 NES_CM_LISTENER_ACTIVE_STATE);
1868                 if (listener) {
1869                         nfo.cm_id = listener->cm_id;
1870                         nfo.conn_type = listener->conn_type;
1871                 } else {
1872                         nfo.cm_id = NULL;
1873                         nfo.conn_type = 0;
1874                 }
1875
1876                 cm_node = make_cm_node(cm_core, nesvnic, &nfo, listener);
1877                 if (!cm_node) {
1878                         nes_debug(NES_DBG_CM, "Unable to allocate node\n");
1879                         if (listener) {
1880                                 nes_debug(NES_DBG_CM, "unable to allocate node and decrementing listener refcount\n");
1881                                 atomic_dec(&listener->ref_count);
1882                         }
1883                         ret = -1;
1884                         goto out;
1885                 }
1886                 if (!listener) {
1887                         nes_debug(NES_DBG_CM, "Packet found for unknown port %x refcnt=%d\n",
1888                                         nfo.loc_port, atomic_read(&cm_node->ref_count));
1889                         if (!tcph->rst) {
1890                                 nes_debug(NES_DBG_CM, "Packet found for unknown port=%d"
1891                                                 " rem_port=%d refcnt=%d\n",
1892                                                 nfo.loc_port, nfo.rem_port, atomic_read(&cm_node->ref_count));
1893
1894                                 cm_node->tcp_cntxt.rcv_nxt = ntohl(tcph->seq);
1895                                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1896                                 send_reset(cm_node);
1897                         }
1898                         rem_ref_cm_node(cm_core, cm_node);
1899                         ret = -1;
1900                         goto out;
1901                 }
1902                 add_ref_cm_node(cm_node);
1903                 cm_node->state = NES_CM_STATE_LISTENING;
1904         }
1905
1906         nes_debug(NES_DBG_CM, "Processing Packet for node %p, data = (%p):\n",
1907                         cm_node, skb->data);
1908         process_packet(cm_node, skb, cm_core);
1909
1910         rem_ref_cm_node(cm_core, cm_node);
1911         out:
1912         if (skb)
1913                 dev_kfree_skb_any(skb);
1914         return ret;
1915 }
1916
1917
1918 /**
1919  * nes_cm_alloc_core - allocate a top level instance of a cm core
1920  */
1921 static struct nes_cm_core *nes_cm_alloc_core(void)
1922 {
1923         int i;
1924
1925         struct nes_cm_core *cm_core;
1926         struct sk_buff *skb = NULL;
1927
1928         /* setup the CM core */
1929         /* alloc top level core control structure */
1930         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
1931         if (!cm_core)
1932                 return NULL;
1933
1934         INIT_LIST_HEAD(&cm_core->connected_nodes);
1935         init_timer(&cm_core->tcp_timer);
1936         cm_core->tcp_timer.function = nes_cm_timer_tick;
1937
1938         cm_core->mtu   = NES_CM_DEFAULT_MTU;
1939         cm_core->state = NES_CM_STATE_INITED;
1940         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
1941
1942         atomic_set(&cm_core->events_posted, 0);
1943
1944         /* init the packet lists */
1945         skb_queue_head_init(&cm_core->tx_free_list);
1946
1947         for (i = 0; i < NES_CM_DEFAULT_FRAME_CNT; i++) {
1948                 skb = dev_alloc_skb(cm_core->mtu);
1949                 if (!skb) {
1950                         kfree(cm_core);
1951                         return NULL;
1952                 }
1953                 /* add 'raw' skb to free frame list */
1954                 skb_queue_head(&cm_core->tx_free_list, skb);
1955         }
1956
1957         cm_core->api = &nes_cm_api;
1958
1959         spin_lock_init(&cm_core->ht_lock);
1960         spin_lock_init(&cm_core->listen_list_lock);
1961
1962         INIT_LIST_HEAD(&cm_core->listen_list.list);
1963
1964         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
1965
1966         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
1967         cm_core->event_wq = create_singlethread_workqueue("nesewq");
1968         cm_core->post_event = nes_cm_post_event;
1969         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
1970         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
1971
1972         print_core(cm_core);
1973         return cm_core;
1974 }
1975
1976
1977 /**
1978  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
1979  */
1980 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
1981 {
1982         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
1983
1984         if (!cm_core)
1985                 return -EINVAL;
1986
1987         barrier();
1988
1989         if (timer_pending(&cm_core->tcp_timer)) {
1990                 del_timer(&cm_core->tcp_timer);
1991         }
1992
1993         destroy_workqueue(cm_core->event_wq);
1994         destroy_workqueue(cm_core->disconn_wq);
1995         nes_debug(NES_DBG_CM, "\n");
1996         kfree(cm_core);
1997
1998         return 0;
1999 }
2000
2001
2002 /**
2003  * mini_cm_get
2004  */
2005 static int mini_cm_get(struct nes_cm_core *cm_core)
2006 {
2007         return cm_core->state;
2008 }
2009
2010
2011 /**
2012  * mini_cm_set
2013  */
2014 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2015 {
2016         int ret = 0;
2017
2018         switch (type) {
2019                 case NES_CM_SET_PKT_SIZE:
2020                         cm_core->mtu = value;
2021                         break;
2022                 case NES_CM_SET_FREE_PKT_Q_SIZE:
2023                         cm_core->free_tx_pkt_max = value;
2024                         break;
2025                 default:
2026                         /* unknown set option */
2027                         ret = -EINVAL;
2028         }
2029
2030         return ret;
2031 }
2032
2033
2034 /**
2035  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2036  * successfully exchanged when this is called
2037  */
2038 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2039 {
2040         int ret = 0;
2041
2042         if (!nesqp)
2043                 return -EINVAL;
2044
2045         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2046                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2047                         NES_QPCONTEXT_MISC_DROS);
2048
2049         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2050                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2051
2052         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2053
2054         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2055
2056         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2057                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2058
2059         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2060                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2061                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2062
2063         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2064                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2065                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2066
2067         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2068         nesqp->nesqp_context->ts_recent = 0;
2069         nesqp->nesqp_context->ts_age = 0;
2070         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2071         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2072         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2073         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2074                         cm_node->tcp_cntxt.rcv_wscale);
2075         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2076         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2077         nesqp->nesqp_context->srtt = 0;
2078         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2079         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2080         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2081         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2082         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2083         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2084
2085         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2086                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2087                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2088                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2089                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2090                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2091                         le32_to_cpu(nesqp->nesqp_context->misc));
2092         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2093         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2094         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2095
2096         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2097         cm_node->state = NES_CM_STATE_TSA;
2098
2099         return ret;
2100 }
2101
2102
2103 /**
2104  * nes_cm_disconn
2105  */
2106 int nes_cm_disconn(struct nes_qp *nesqp)
2107 {
2108         unsigned long flags;
2109
2110         spin_lock_irqsave(&nesqp->lock, flags);
2111         if (nesqp->disconn_pending == 0) {
2112                 nesqp->disconn_pending++;
2113                 spin_unlock_irqrestore(&nesqp->lock, flags);
2114                 /* nes_add_ref(&nesqp->ibqp); */
2115                 /* init our disconnect work element, to */
2116                 INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);
2117
2118                 queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
2119         } else {
2120                 spin_unlock_irqrestore(&nesqp->lock, flags);
2121                 nes_rem_ref(&nesqp->ibqp);
2122         }
2123
2124         return 0;
2125 }
2126
2127
2128 /**
2129  * nes_disconnect_worker
2130  */
2131 static void nes_disconnect_worker(struct work_struct *work)
2132 {
2133         struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);
2134
2135         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2136                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2137         nes_cm_disconn_true(nesqp);
2138 }
2139
2140
2141 /**
2142  * nes_cm_disconn_true
2143  */
2144 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2145 {
2146         unsigned long flags;
2147         int ret = 0;
2148         struct iw_cm_id *cm_id;
2149         struct iw_cm_event cm_event;
2150         struct nes_vnic *nesvnic;
2151         u16 last_ae;
2152         u8 original_hw_tcp_state;
2153         u8 original_ibqp_state;
2154         u8 issued_disconnect_reset = 0;
2155
2156         if (!nesqp) {
2157                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2158                 return -1;
2159         }
2160
2161         spin_lock_irqsave(&nesqp->lock, flags);
2162         cm_id = nesqp->cm_id;
2163         /* make sure we havent already closed this connection */
2164         if (!cm_id) {
2165                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2166                                 nesqp->hwqp.qp_id);
2167                 spin_unlock_irqrestore(&nesqp->lock, flags);
2168                 nes_rem_ref(&nesqp->ibqp);
2169                 return -1;
2170         }
2171
2172         nesvnic = to_nesvnic(nesqp->ibqp.device);
2173         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2174
2175         original_hw_tcp_state = nesqp->hw_tcp_state;
2176         original_ibqp_state   = nesqp->ibqp_state;
2177         last_ae = nesqp->last_aeq;
2178
2179
2180         nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);
2181
2182         if ((nesqp->cm_id) && (cm_id->event_handler)) {
2183                 if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2184                                 ((original_ibqp_state == IB_QPS_RTS) &&
2185                                 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2186                         atomic_inc(&cm_disconnects);
2187                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2188                         if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
2189                                 issued_disconnect_reset = 1;
2190                                 cm_event.status = IW_CM_EVENT_STATUS_RESET;
2191                                 nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event (status reset) for "
2192                                                 " QP%u, cm_id = %p. \n",
2193                                                 nesqp->hwqp.qp_id, cm_id);
2194                         } else {
2195                                 cm_event.status = IW_CM_EVENT_STATUS_OK;
2196                         }
2197
2198                         cm_event.local_addr = cm_id->local_addr;
2199                         cm_event.remote_addr = cm_id->remote_addr;
2200                         cm_event.private_data = NULL;
2201                         cm_event.private_data_len = 0;
2202
2203                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event for "
2204                                         " QP%u, SQ Head = %u, SQ Tail = %u. cm_id = %p, refcount = %u.\n",
2205                                         nesqp->hwqp.qp_id,
2206                                         nesqp->hwqp.sq_head, nesqp->hwqp.sq_tail, cm_id,
2207                                         atomic_read(&nesqp->refcount));
2208
2209                         spin_unlock_irqrestore(&nesqp->lock, flags);
2210                         ret = cm_id->event_handler(cm_id, &cm_event);
2211                         if (ret)
2212                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2213                         spin_lock_irqsave(&nesqp->lock, flags);
2214                 }
2215
2216                 nesqp->disconn_pending = 0;
2217                 /* There might have been another AE while the lock was released */
2218                 original_hw_tcp_state = nesqp->hw_tcp_state;
2219                 original_ibqp_state   = nesqp->ibqp_state;
2220                 last_ae = nesqp->last_aeq;
2221
2222                 if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
2223                                 ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2224                                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2225                                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2226                                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2227                         atomic_inc(&cm_closes);
2228                         nesqp->cm_id = NULL;
2229                         nesqp->in_disconnect = 0;
2230                         spin_unlock_irqrestore(&nesqp->lock, flags);
2231                         nes_disconnect(nesqp, 1);
2232
2233                         cm_id->provider_data = nesqp;
2234                         /* Send up the close complete event */
2235                         cm_event.event = IW_CM_EVENT_CLOSE;
2236                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2237                         cm_event.provider_data = cm_id->provider_data;
2238                         cm_event.local_addr = cm_id->local_addr;
2239                         cm_event.remote_addr = cm_id->remote_addr;
2240                         cm_event.private_data = NULL;
2241                         cm_event.private_data_len = 0;
2242
2243                         ret = cm_id->event_handler(cm_id, &cm_event);
2244                         if (ret) {
2245                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2246                         }
2247
2248                         cm_id->rem_ref(cm_id);
2249
2250                         spin_lock_irqsave(&nesqp->lock, flags);
2251                         if (nesqp->flush_issued == 0) {
2252                                 nesqp->flush_issued = 1;
2253                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2254                                 flush_wqes(nesvnic->nesdev, nesqp, NES_CQP_FLUSH_RQ, 1);
2255                         } else {
2256                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2257                         }
2258
2259                         /* This reference is from either ModifyQP or the AE processing,
2260                                         there is still a race here with modifyqp */
2261                         nes_rem_ref(&nesqp->ibqp);
2262
2263                 } else {
2264                         cm_id = nesqp->cm_id;
2265                         spin_unlock_irqrestore(&nesqp->lock, flags);
2266                         /* check to see if the inbound reset beat the outbound reset */
2267                         if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
2268                                 nes_debug(NES_DBG_CM, "QP%u: Decing refcount due to inbound reset"
2269                                                 " beating the outbound reset.\n",
2270                                                 nesqp->hwqp.qp_id);
2271                                 nes_rem_ref(&nesqp->ibqp);
2272                         }
2273                 }
2274         } else {
2275                 nesqp->disconn_pending = 0;
2276                 spin_unlock_irqrestore(&nesqp->lock, flags);
2277         }
2278         nes_rem_ref(&nesqp->ibqp);
2279
2280         return 0;
2281 }
2282
2283
2284 /**
2285  * nes_disconnect
2286  */
2287 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2288 {
2289         int ret = 0;
2290         struct nes_vnic *nesvnic;
2291         struct nes_device *nesdev;
2292
2293         nesvnic = to_nesvnic(nesqp->ibqp.device);
2294         if (!nesvnic)
2295                 return -EINVAL;
2296
2297         nesdev = nesvnic->nesdev;
2298
2299         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2300                         atomic_read(&nesvnic->netdev->refcnt));
2301
2302         if (nesqp->active_conn) {
2303
2304                 /* indicate this connection is NOT active */
2305                 nesqp->active_conn = 0;
2306         } else {
2307                 /* Need to free the Last Streaming Mode Message */
2308                 if (nesqp->ietf_frame) {
2309                         pci_free_consistent(nesdev->pcidev,
2310                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2311                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2312                 }
2313         }
2314
2315         /* close the CM node down if it is still active */
2316         if (nesqp->cm_node) {
2317                 nes_debug(NES_DBG_CM, "Call close API\n");
2318
2319                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2320                 nesqp->cm_node = NULL;
2321         }
2322
2323         return ret;
2324 }
2325
2326
2327 /**
2328  * nes_accept
2329  */
2330 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2331 {
2332         u64 u64temp;
2333         struct ib_qp *ibqp;
2334         struct nes_qp *nesqp;
2335         struct nes_vnic *nesvnic;
2336         struct nes_device *nesdev;
2337         struct nes_cm_node *cm_node;
2338         struct nes_adapter *adapter;
2339         struct ib_qp_attr attr;
2340         struct iw_cm_event cm_event;
2341         struct nes_hw_qp_wqe *wqe;
2342         struct nes_v4_quad nes_quad;
2343         u32 crc_value;
2344         int ret;
2345
2346         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2347         if (!ibqp)
2348                 return -EINVAL;
2349
2350         /* get all our handles */
2351         nesqp = to_nesqp(ibqp);
2352         nesvnic = to_nesvnic(nesqp->ibqp.device);
2353         nesdev = nesvnic->nesdev;
2354         adapter = nesdev->nesadapter;
2355
2356         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
2357                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
2358
2359         /* since this is from a listen, we were able to put node handle into cm_id */
2360         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2361
2362         /* associate the node with the QP */
2363         nesqp->cm_node = (void *)cm_node;
2364
2365         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu\n",
2366                         nesqp->hwqp.qp_id, cm_node, jiffies);
2367         atomic_inc(&cm_accepts);
2368
2369         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2370                         atomic_read(&nesvnic->netdev->refcnt));
2371
2372                 /* allocate the ietf frame and space for private data */
2373                 nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2374                                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2375                                 &nesqp->ietf_frame_pbase);
2376
2377                 if (!nesqp->ietf_frame) {
2378                         nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
2379                         return -ENOMEM;
2380                 }
2381
2382
2383                 /* setup the MPA frame */
2384                 nesqp->private_data_len = conn_param->private_data_len;
2385                 memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2386
2387                 memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2388                                 conn_param->private_data_len);
2389
2390                 nesqp->ietf_frame->priv_data_len = cpu_to_be16(conn_param->private_data_len);
2391                 nesqp->ietf_frame->rev = mpa_version;
2392                 nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2393
2394                 /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2395                 wqe = &nesqp->hwqp.sq_vbase[0];
2396
2397                 if (cm_id->remote_addr.sin_addr.s_addr != cm_id->local_addr.sin_addr.s_addr) {
2398                         u64temp = (unsigned long)nesqp;
2399                         u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2400                         set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2401                                             u64temp);
2402                         wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2403                                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING | NES_IWARP_SQ_WQE_WRPDU);
2404                         wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2405                                         cpu_to_le32(conn_param->private_data_len + sizeof(struct ietf_mpa_frame));
2406                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] =
2407                                         cpu_to_le32((u32)nesqp->ietf_frame_pbase);
2408                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] =
2409                                         cpu_to_le32((u32)((u64)nesqp->ietf_frame_pbase >> 32));
2410                         wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2411                                         cpu_to_le32(conn_param->private_data_len + sizeof(struct ietf_mpa_frame));
2412                         wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
2413
2414                         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2415                                         NES_QPCONTEXT_ORDIRD_LSMM_PRESENT | NES_QPCONTEXT_ORDIRD_WRPDU);
2416                 } else {
2417                         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2418                                         NES_QPCONTEXT_ORDIRD_WRPDU | NES_QPCONTEXT_ORDIRD_ALSMM));
2419                 }
2420                 nesqp->skip_lsmm = 1;
2421
2422
2423         /* Cache the cm_id in the qp */
2424         nesqp->cm_id = cm_id;
2425         cm_node->cm_id = cm_id;
2426
2427         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2428         cm_id->provider_data = nesqp;
2429         nesqp->active_conn   = 0;
2430
2431         nes_cm_init_tsa_conn(nesqp, cm_node);
2432
2433         nesqp->nesqp_context->tcpPorts[0] = cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2434         nesqp->nesqp_context->tcpPorts[1] = cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2435         nesqp->nesqp_context->ip0 = cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2436
2437         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2438                         (u32)PCI_FUNC(nesdev->pcidev->devfn) << NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2439
2440         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
2441                         nes_arp_table(nesdev, le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2442                         NES_ARP_RESOLVE) << 16);
2443
2444         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2445                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2446
2447         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2448
2449         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2450                         ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2451         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2452
2453         memset(&nes_quad, 0, sizeof(nes_quad));
2454         nes_quad.DstIpAdrIndex = cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2455         nes_quad.SrcIpadr      = cm_id->remote_addr.sin_addr.s_addr;
2456         nes_quad.TcpPorts[0]   = cm_id->remote_addr.sin_port;
2457         nes_quad.TcpPorts[1]   = cm_id->local_addr.sin_port;
2458
2459         /* Produce hash key */
2460         crc_value = get_crc_value(&nes_quad);
2461         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2462         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2463                         nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2464
2465         nesqp->hte_index &= adapter->hte_index_mask;
2466         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2467
2468         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2469
2470         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = 0x%08X:0x%04X,"
2471                         " rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + private data length=%zu.\n",
2472                         nesqp->hwqp.qp_id,
2473                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2474                         ntohs(cm_id->remote_addr.sin_port),
2475                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2476                         ntohs(cm_id->local_addr.sin_port),
2477                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2478                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2479                         conn_param->private_data_len+sizeof(struct ietf_mpa_frame));
2480
2481         attr.qp_state = IB_QPS_RTS;
2482         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2483
2484         /* notify OF layer that accept event was successfull */
2485         cm_id->add_ref(cm_id);
2486
2487         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2488         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2489         cm_event.provider_data = (void *)nesqp;
2490         cm_event.local_addr = cm_id->local_addr;
2491         cm_event.remote_addr = cm_id->remote_addr;
2492         cm_event.private_data = NULL;
2493         cm_event.private_data_len = 0;
2494         ret = cm_id->event_handler(cm_id, &cm_event);
2495         if (cm_node->loopbackpartner) {
2496                 cm_node->loopbackpartner->mpa_frame_size = nesqp->private_data_len;
2497                 /* copy entire MPA frame to our cm_node's frame */
2498                 memcpy(cm_node->loopbackpartner->mpa_frame_buf, nesqp->ietf_frame->priv_data,
2499                            nesqp->private_data_len);
2500                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2501         }
2502         if (ret)
2503                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
2504                                 __func__, __LINE__, ret);
2505
2506         return 0;
2507 }
2508
2509
2510 /**
2511  * nes_reject
2512  */
2513 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2514 {
2515         struct nes_cm_node *cm_node;
2516         struct nes_cm_core *cm_core;
2517
2518         atomic_inc(&cm_rejects);
2519         cm_node = (struct nes_cm_node *) cm_id->provider_data;
2520         cm_core = cm_node->cm_core;
2521         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
2522
2523         strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
2524         memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
2525
2526         cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
2527         cm_node->mpa_frame.rev = mpa_version;
2528         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
2529
2530         cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
2531
2532         return 0;
2533 }
2534
2535
2536 /**
2537  * nes_connect
2538  * setup and launch cm connect node
2539  */
2540 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2541 {
2542         struct ib_qp *ibqp;
2543         struct nes_qp *nesqp;
2544         struct nes_vnic *nesvnic;
2545         struct nes_device *nesdev;
2546         struct nes_cm_node *cm_node;
2547         struct nes_cm_info cm_info;
2548
2549         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2550         if (!ibqp)
2551                 return -EINVAL;
2552         nesqp = to_nesqp(ibqp);
2553         if (!nesqp)
2554                 return -EINVAL;
2555         nesvnic = to_nesvnic(nesqp->ibqp.device);
2556         if (!nesvnic)
2557                 return -EINVAL;
2558         nesdev  = nesvnic->nesdev;
2559         if (!nesdev)
2560                 return -EINVAL;
2561
2562         atomic_inc(&cm_connects);
2563
2564         nesqp->ietf_frame = kzalloc(sizeof(struct ietf_mpa_frame) +
2565                         conn_param->private_data_len, GFP_KERNEL);
2566         if (!nesqp->ietf_frame)
2567                 return -ENOMEM;
2568
2569         /* set qp as having an active connection */
2570         nesqp->active_conn = 1;
2571
2572         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = 0x%08X:0x%04X.\n",
2573                         nesqp->hwqp.qp_id,
2574                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2575                         ntohs(cm_id->remote_addr.sin_port),
2576                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2577                         ntohs(cm_id->local_addr.sin_port));
2578
2579         /* cache the cm_id in the qp */
2580         nesqp->cm_id = cm_id;
2581
2582         cm_id->provider_data = nesqp;
2583
2584         /* copy the private data */
2585         if (conn_param->private_data_len) {
2586                 memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2587                                 conn_param->private_data_len);
2588         }
2589
2590         nesqp->private_data_len = conn_param->private_data_len;
2591         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2592         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
2593         nes_debug(NES_DBG_CM, "mpa private data len =%u\n", conn_param->private_data_len);
2594
2595         strcpy(&nesqp->ietf_frame->key[0], IEFT_MPA_KEY_REQ);
2596         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2597         nesqp->ietf_frame->rev = IETF_MPA_VERSION;
2598         nesqp->ietf_frame->priv_data_len = htons(conn_param->private_data_len);
2599
2600         if (cm_id->local_addr.sin_addr.s_addr != cm_id->remote_addr.sin_addr.s_addr)
2601                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2602                                 PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2603
2604         /* set up the connection params for the node */
2605         cm_info.loc_addr = (cm_id->local_addr.sin_addr.s_addr);
2606         cm_info.loc_port = (cm_id->local_addr.sin_port);
2607         cm_info.rem_addr = (cm_id->remote_addr.sin_addr.s_addr);
2608         cm_info.rem_port = (cm_id->remote_addr.sin_port);
2609         cm_info.cm_id = cm_id;
2610         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2611
2612         cm_id->add_ref(cm_id);
2613         nes_add_ref(&nesqp->ibqp);
2614
2615         /* create a connect CM node connection */
2616         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic, nesqp->ietf_frame, &cm_info);
2617         if (!cm_node) {
2618                 if (cm_id->local_addr.sin_addr.s_addr != cm_id->remote_addr.sin_addr.s_addr)
2619                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2620                                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
2621                 nes_rem_ref(&nesqp->ibqp);
2622                 kfree(nesqp->ietf_frame);
2623                 nesqp->ietf_frame = NULL;
2624                 cm_id->rem_ref(cm_id);
2625                 return -ENOMEM;
2626         }
2627
2628         cm_node->apbvt_set = 1;
2629         nesqp->cm_node = cm_node;
2630
2631         return 0;
2632 }
2633
2634
2635 /**
2636  * nes_create_listen
2637  */
2638 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
2639 {
2640         struct nes_vnic *nesvnic;
2641         struct nes_cm_listener *cm_node;
2642         struct nes_cm_info cm_info;
2643         struct nes_adapter *adapter;
2644         int err;
2645
2646
2647         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
2648                         cm_id, ntohs(cm_id->local_addr.sin_port));
2649
2650         nesvnic = to_nesvnic(cm_id->device);
2651         if (!nesvnic)
2652                 return -EINVAL;
2653         adapter = nesvnic->nesdev->nesadapter;
2654         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
2655                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
2656
2657         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
2658                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
2659
2660         /* setup listen params in our api call struct */
2661         cm_info.loc_addr = nesvnic->local_ipaddr;
2662         cm_info.loc_port = cm_id->local_addr.sin_port;
2663         cm_info.backlog = backlog;
2664         cm_info.cm_id = cm_id;
2665
2666         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2667
2668
2669         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
2670         if (!cm_node) {
2671                 printk("%s[%u] Error returned from listen API call\n",
2672                                 __func__, __LINE__);
2673                 return -ENOMEM;
2674         }
2675
2676         cm_id->provider_data = cm_node;
2677
2678         if (!cm_node->reused_node) {
2679                 err = nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2680                                 PCI_FUNC(nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2681                 if (err) {
2682                         printk("nes_manage_apbvt call returned %d.\n", err);
2683                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
2684                         return err;
2685                 }
2686                 cm_listens_created++;
2687         }
2688
2689         cm_id->add_ref(cm_id);
2690         cm_id->provider_data = (void *)cm_node;
2691
2692
2693         return 0;
2694 }
2695
2696
2697 /**
2698  * nes_destroy_listen
2699  */
2700 int nes_destroy_listen(struct iw_cm_id *cm_id)
2701 {
2702         if (cm_id->provider_data)
2703                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
2704         else
2705                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
2706
2707         cm_id->rem_ref(cm_id);
2708
2709         return 0;
2710 }
2711
2712
2713 /**
2714  * nes_cm_recv
2715  */
2716 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
2717 {
2718         cm_packets_received++;
2719         if ((g_cm_core) && (g_cm_core->api)) {
2720                 g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
2721         } else {
2722                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
2723                                 " cm is not setup properly.\n");
2724         }
2725
2726         return 0;
2727 }
2728
2729
2730 /**
2731  * nes_cm_start
2732  * Start and init a cm core module
2733  */
2734 int nes_cm_start(void)
2735 {
2736         nes_debug(NES_DBG_CM, "\n");
2737         /* create the primary CM core, pass this handle to subsequent core inits */
2738         g_cm_core = nes_cm_alloc_core();
2739         if (g_cm_core) {
2740                 return 0;
2741         } else {
2742                 return -ENOMEM;
2743         }
2744 }
2745
2746
2747 /**
2748  * nes_cm_stop
2749  * stop and dealloc all cm core instances
2750  */
2751 int nes_cm_stop(void)
2752 {
2753         g_cm_core->api->destroy_cm_core(g_cm_core);
2754         return 0;
2755 }
2756
2757
2758 /**
2759  * cm_event_connected
2760  * handle a connected event, setup QPs and HW
2761  */
2762 static void cm_event_connected(struct nes_cm_event *event)
2763 {
2764         u64 u64temp;
2765         struct nes_qp *nesqp;
2766         struct nes_vnic *nesvnic;
2767         struct nes_device *nesdev;
2768         struct nes_cm_node *cm_node;
2769         struct nes_adapter *nesadapter;
2770         struct ib_qp_attr attr;
2771         struct iw_cm_id *cm_id;
2772         struct iw_cm_event cm_event;
2773         struct nes_hw_qp_wqe *wqe;
2774         struct nes_v4_quad nes_quad;
2775         u32 crc_value;
2776         int ret;
2777
2778         /* get all our handles */
2779         cm_node = event->cm_node;
2780         cm_id = cm_node->cm_id;
2781         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
2782         nesqp = (struct nes_qp *)cm_id->provider_data;
2783         nesvnic = to_nesvnic(nesqp->ibqp.device);
2784         nesdev = nesvnic->nesdev;
2785         nesadapter = nesdev->nesadapter;
2786
2787         if (nesqp->destroyed) {
2788                 return;
2789         }
2790         atomic_inc(&cm_connecteds);
2791         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
2792                         " local port 0x%04X. jiffies = %lu.\n",
2793                         nesqp->hwqp.qp_id,
2794                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2795                         ntohs(cm_id->remote_addr.sin_port),
2796                         ntohs(cm_id->local_addr.sin_port),
2797                         jiffies);
2798
2799         nes_cm_init_tsa_conn(nesqp, cm_node);
2800
2801         /* set the QP tsa context */
2802         nesqp->nesqp_context->tcpPorts[0] = cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2803         nesqp->nesqp_context->tcpPorts[1] = cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2804         nesqp->nesqp_context->ip0 = cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2805
2806         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2807                         (u32)PCI_FUNC(nesdev->pcidev->devfn) << NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2808         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
2809                         nes_arp_table(nesdev, le32_to_cpu(nesqp->nesqp_context->ip0),
2810                         NULL, NES_ARP_RESOLVE) << 16);
2811         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2812                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2813         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2814         nesqp->nesqp_context->ird_ord_sizes |=
2815                         cpu_to_le32((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
2816
2817         /* Adjust tail for not having a LSMM */
2818         nesqp->hwqp.sq_tail = 1;
2819
2820 #if defined(NES_SEND_FIRST_WRITE)
2821                 if (cm_node->send_write0) {
2822                         nes_debug(NES_DBG_CM, "Sending first write.\n");
2823                         wqe = &nesqp->hwqp.sq_vbase[0];
2824                         u64temp = (unsigned long)nesqp;
2825                         u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2826                         set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2827                                             u64temp);
2828                         wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] = cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
2829                         wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
2830                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
2831                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
2832                         wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
2833                         wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
2834
2835                         /* use the reserved spot on the WQ for the extra first WQE */
2836                         nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2837                                         NES_QPCONTEXT_ORDIRD_WRPDU | NES_QPCONTEXT_ORDIRD_ALSMM));
2838                         nesqp->skip_lsmm = 1;
2839                         nesqp->hwqp.sq_tail = 0;
2840                         nes_write32(nesdev->regs + NES_WQE_ALLOC,
2841                                         (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
2842                 }
2843 #endif
2844
2845         memset(&nes_quad, 0, sizeof(nes_quad));
2846
2847         nes_quad.DstIpAdrIndex = cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2848         nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2849         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2850         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2851
2852         /* Produce hash key */
2853         crc_value = get_crc_value(&nes_quad);
2854         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2855         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
2856                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
2857
2858         nesqp->hte_index &= nesadapter->hte_index_mask;
2859         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2860
2861         nesqp->ietf_frame = &cm_node->mpa_frame;
2862         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
2863         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2864
2865         /* modify QP state to rts */
2866         attr.qp_state = IB_QPS_RTS;
2867         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2868
2869         /* notify OF layer we successfully created the requested connection */
2870         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
2871         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2872         cm_event.provider_data = cm_id->provider_data;
2873         cm_event.local_addr.sin_family = AF_INET;
2874         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
2875         cm_event.remote_addr = cm_id->remote_addr;
2876
2877                 cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
2878                 cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
2879
2880         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
2881         ret = cm_id->event_handler(cm_id, &cm_event);
2882         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2883
2884         if (ret)
2885                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
2886                                 __func__, __LINE__, ret);
2887         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = %lu\n",
2888                         nesqp->hwqp.qp_id, jiffies );
2889
2890         nes_rem_ref(&nesqp->ibqp);
2891
2892         return;
2893 }
2894
2895
2896 /**
2897  * cm_event_connect_error
2898  */
2899 static void cm_event_connect_error(struct nes_cm_event *event)
2900 {
2901         struct nes_qp *nesqp;
2902         struct iw_cm_id *cm_id;
2903         struct iw_cm_event cm_event;
2904         /* struct nes_cm_info cm_info; */
2905         int ret;
2906
2907         if (!event->cm_node)
2908                 return;
2909
2910         cm_id = event->cm_node->cm_id;
2911         if (!cm_id) {
2912                 return;
2913         }
2914
2915         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
2916         nesqp = cm_id->provider_data;
2917
2918         if (!nesqp) {
2919                 return;
2920         }
2921
2922         /* notify OF layer about this connection error event */
2923         /* cm_id->rem_ref(cm_id); */
2924         nesqp->cm_id = NULL;
2925         cm_id->provider_data = NULL;
2926         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
2927         cm_event.status = IW_CM_EVENT_STATUS_REJECTED;
2928         cm_event.provider_data = cm_id->provider_data;
2929         cm_event.local_addr = cm_id->local_addr;
2930         cm_event.remote_addr = cm_id->remote_addr;
2931         cm_event.private_data = NULL;
2932         cm_event.private_data_len = 0;
2933
2934         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, remove_addr=%08x\n",
2935                         cm_event.local_addr.sin_addr.s_addr, cm_event.remote_addr.sin_addr.s_addr);
2936
2937         ret = cm_id->event_handler(cm_id, &cm_event);
2938         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2939         if (ret)
2940                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
2941                                 __func__, __LINE__, ret);
2942         nes_rem_ref(&nesqp->ibqp);
2943                 cm_id->rem_ref(cm_id);
2944
2945         return;
2946 }
2947
2948
2949 /**
2950  * cm_event_reset
2951  */
2952 static void cm_event_reset(struct nes_cm_event *event)
2953 {
2954         struct nes_qp *nesqp;
2955         struct iw_cm_id *cm_id;
2956         struct iw_cm_event cm_event;
2957         /* struct nes_cm_info cm_info; */
2958         int ret;
2959
2960         if (!event->cm_node)
2961                 return;
2962
2963         if (!event->cm_node->cm_id)
2964                 return;
2965
2966         cm_id = event->cm_node->cm_id;
2967
2968         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
2969         nesqp = cm_id->provider_data;
2970
2971         nesqp->cm_id = NULL;
2972         /* cm_id->provider_data = NULL; */
2973         cm_event.event = IW_CM_EVENT_DISCONNECT;
2974         cm_event.status = IW_CM_EVENT_STATUS_RESET;
2975         cm_event.provider_data = cm_id->provider_data;
2976         cm_event.local_addr = cm_id->local_addr;
2977         cm_event.remote_addr = cm_id->remote_addr;
2978         cm_event.private_data = NULL;
2979         cm_event.private_data_len = 0;
2980
2981         ret = cm_id->event_handler(cm_id, &cm_event);
2982         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2983
2984
2985         /* notify OF layer about this connection error event */
2986         cm_id->rem_ref(cm_id);
2987
2988         return;
2989 }
2990
2991
2992 /**
2993  * cm_event_mpa_req
2994  */
2995 static void cm_event_mpa_req(struct nes_cm_event *event)
2996 {
2997         struct iw_cm_id   *cm_id;
2998         struct iw_cm_event cm_event;
2999         int ret;
3000         struct nes_cm_node *cm_node;
3001
3002         cm_node = event->cm_node;
3003         if (!cm_node)
3004                 return;
3005         cm_id = cm_node->cm_id;
3006
3007         atomic_inc(&cm_connect_reqs);
3008         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3009                         cm_node, cm_id, jiffies);
3010
3011         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3012         cm_event.status = IW_CM_EVENT_STATUS_OK;
3013         cm_event.provider_data = (void *)cm_node;
3014
3015         cm_event.local_addr.sin_family = AF_INET;
3016         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3017         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3018
3019         cm_event.remote_addr.sin_family = AF_INET;
3020         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3021         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3022
3023                 cm_event.private_data                = cm_node->mpa_frame_buf;
3024                 cm_event.private_data_len            = (u8) cm_node->mpa_frame_size;
3025
3026         ret = cm_id->event_handler(cm_id, &cm_event);
3027         if (ret)
3028                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
3029                                 __func__, __LINE__, ret);
3030
3031         return;
3032 }
3033
3034
3035 static void nes_cm_event_handler(struct work_struct *);
3036
3037 /**
3038  * nes_cm_post_event
3039  * post an event to the cm event handler
3040  */
3041 static int nes_cm_post_event(struct nes_cm_event *event)
3042 {
3043         atomic_inc(&event->cm_node->cm_core->events_posted);
3044         add_ref_cm_node(event->cm_node);
3045         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3046         INIT_WORK(&event->event_work, nes_cm_event_handler);
3047         nes_debug(NES_DBG_CM, "queue_work, event=%p\n", event);
3048
3049         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3050
3051         nes_debug(NES_DBG_CM, "Exit\n");
3052         return 0;
3053 }
3054
3055
3056 /**
3057  * nes_cm_event_handler
3058  * worker function to handle cm events
3059  * will free instance of nes_cm_event
3060  */
3061 static void nes_cm_event_handler(struct work_struct *work)
3062 {
3063         struct nes_cm_event *event = container_of(work, struct nes_cm_event, event_work);
3064         struct nes_cm_core *cm_core;
3065
3066         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core)) {
3067                 return;
3068         }
3069         cm_core = event->cm_node->cm_core;
3070         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3071                         event, event->type, atomic_read(&cm_core->events_posted));
3072
3073         switch (event->type) {
3074                 case NES_CM_EVENT_MPA_REQ:
3075                         cm_event_mpa_req(event);
3076                         nes_debug(NES_DBG_CM, "CM Event: MPA REQUEST\n");
3077                         break;
3078                 case NES_CM_EVENT_RESET:
3079                         nes_debug(NES_DBG_CM, "CM Event: RESET\n");
3080                         cm_event_reset(event);
3081                         break;
3082                 case NES_CM_EVENT_CONNECTED:
3083                         if ((!event->cm_node->cm_id) ||
3084                                 (event->cm_node->state != NES_CM_STATE_TSA)) {
3085                                 break;
3086                         }
3087                         cm_event_connected(event);
3088                         nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3089                         break;
3090                 case NES_CM_EVENT_ABORTED:
3091                         if ((!event->cm_node->cm_id) || (event->cm_node->state == NES_CM_STATE_TSA)) {
3092                                 break;
3093                         }
3094                         cm_event_connect_error(event);
3095                         nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3096                         break;
3097                 case NES_CM_EVENT_DROPPED_PKT:
3098                         nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3099                         break;
3100                 default:
3101                         nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3102                         break;
3103         }
3104
3105         atomic_dec(&cm_core->events_posted);
3106         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3107         rem_ref_cm_node(cm_core, event->cm_node);
3108         kfree(event);
3109
3110         return;
3111 }