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 *hte;
 847         struct nes_cm_node *cm_node;
 848
 849         /* make a hash index key for this packet */
 850         hashkey = make_hashkey(loc_port, loc_addr, rem_port, rem_addr);
 851
 852         /* get a handle on the hte */
 853         hte = &cm_core->connected_nodes;
 854
 855         nes_debug(NES_DBG_CM, "Searching for an owner node:%x:%x from core %p->%p\n",
 856                         loc_addr, loc_port, cm_core, hte);
 857
 858         /* walk list and find cm_node associated with this session ID */
 859         spin_lock_irqsave(&cm_core->ht_lock, flags);
 860         list_for_each_entry(cm_node, hte, list) {
 861                 /* compare quad, return node handle if a match */
 862                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
 863                                 cm_node->loc_addr, cm_node->loc_port,
 864                                 loc_addr, loc_port,
 865                                 cm_node->rem_addr, cm_node->rem_port,
 866                                 rem_addr, rem_port);
 867                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
 868                                 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
 869                         add_ref_cm_node(cm_node);
 870                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 871                         return cm_node;
 872                 }
 873         }
 874         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 875
 876         /* no owner node */
 877         return NULL;
 878 }
 879
 880
 881 /**
 882  * find_listener - find a cm node listening on this addr-port pair
 883  */
 884 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
 885                 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
 886 {
 887         unsigned long flags;
 888         struct nes_cm_listener *listen_node;
 889
 890         /* walk list and find cm_node associated with this session ID */
 891         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 892         list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
 893                 /* compare node pair, return node handle if a match */
 894                 if (((listen_node->loc_addr == dst_addr) ||
 895                                 listen_node->loc_addr == 0x00000000) &&
 896                                 (listen_node->loc_port == dst_port) &&
 897                                 (listener_state & listen_node->listener_state)) {
 898                         atomic_inc(&listen_node->ref_count);
 899                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 900                         return listen_node;
 901                 }
 902         }
 903         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 904
 905         nes_debug(NES_DBG_CM, "Unable to find listener- %x:%x\n",
 906                         dst_addr, dst_port);
 907
 908         /* no listener */
 909         return NULL;
 910 }
 911
 912
 913 /**
 914  * add_hte_node - add a cm node to the hash table
 915  */
 916 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
 917 {
 918         unsigned long flags;
 919         u32 hashkey;
 920         struct list_head *hte;
 921
 922         if (!cm_node || !cm_core)
 923                 return -EINVAL;
 924
 925         nes_debug(NES_DBG_CM, "Adding Node to Active Connection HT\n");
 926
 927         /* first, make an index into our hash table */
 928         hashkey = make_hashkey(cm_node->loc_port, cm_node->loc_addr,
 929                         cm_node->rem_port, cm_node->rem_addr);
 930         cm_node->hashkey = hashkey;
 931
 932         spin_lock_irqsave(&cm_core->ht_lock, flags);
 933
 934         /* get a handle on the hash table element (list head for this slot) */
 935         hte = &cm_core->connected_nodes;
 936         list_add_tail(&cm_node->list, hte);
 937         atomic_inc(&cm_core->ht_node_cnt);
 938
 939         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 940
 941         return 0;
 942 }
 943
 944
 945 /**
 946  * mini_cm_dec_refcnt_listen
 947  */
 948 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
 949                 struct nes_cm_listener *listener, int free_hanging_nodes)
 950 {
 951         int ret = 1;
 952         unsigned long flags;
 953         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 954         if (!atomic_dec_return(&listener->ref_count)) {
 955                 list_del(&listener->list);
 956
 957                 /* decrement our listen node count */
 958                 atomic_dec(&cm_core->listen_node_cnt);
 959
 960                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 961
 962                 if (listener->nesvnic) {
 963                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
 964                                         PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
 965                 }
 966
 967                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
 968
 969                 kfree(listener);
 970                 listener = NULL;
 971                 ret = 0;
 972                 cm_listens_destroyed++;
 973         } else {
 974                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 975         }
 976         if (listener) {
 977                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
 978                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
 979                                         " with non-zero pending accepts=%u\n",
 980                                         listener, atomic_read(&listener->pend_accepts_cnt));
 981         }
 982
 983         return ret;
 984 }
 985
 986
 987 /**
 988  * mini_cm_del_listen
 989  */
 990 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
 991                 struct nes_cm_listener *listener)
 992 {
 993         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
 994         listener->cm_id = NULL; /* going to be destroyed pretty soon */
 995         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
 996 }
 997
 998
 999 /**
1000  * mini_cm_accelerated
1001  */
1002 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1003                 struct nes_cm_node *cm_node)
1004 {
1005         u32 was_timer_set;
1006         cm_node->accelerated = 1;
1007
1008         if (cm_node->accept_pend) {
1009                 BUG_ON(!cm_node->listener);
1010                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1011                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1012         }
1013
1014         was_timer_set = timer_pending(&cm_core->tcp_timer);
1015         if (!was_timer_set) {
1016                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1017                 add_timer(&cm_core->tcp_timer);
1018         }
1019
1020         return 0;
1021 }
1022
1023
1024 /**
1025  * nes_addr_send_arp
1026  */
1027 static void nes_addr_send_arp(u32 dst_ip)
1028 {
1029         struct rtable *rt;
1030         struct flowi fl;
1031
1032         memset(&fl, 0, sizeof fl);
1033         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1034         if (ip_route_output_key(&init_net, &rt, &fl)) {
1035                 printk("%s: ip_route_output_key failed for 0x%08X\n",
1036                                 __func__, dst_ip);
1037                 return;
1038         }
1039
1040         neigh_event_send(rt->u.dst.neighbour, NULL);
1041         ip_rt_put(rt);
1042 }
1043
1044
1045 /**
1046  * make_cm_node - create a new instance of a cm node
1047  */
1048 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1049                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1050                 struct nes_cm_listener *listener)
1051 {
1052         struct nes_cm_node *cm_node;
1053         struct timespec ts;
1054         int arpindex = 0;
1055         struct nes_device *nesdev;
1056         struct nes_adapter *nesadapter;
1057         DECLARE_MAC_BUF(mac);
1058
1059         /* create an hte and cm_node for this instance */
1060         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1061         if (!cm_node)
1062                 return NULL;
1063
1064         /* set our node specific transport info */
1065         cm_node->loc_addr = cm_info->loc_addr;
1066         cm_node->rem_addr = cm_info->rem_addr;
1067         cm_node->loc_port = cm_info->loc_port;
1068         cm_node->rem_port = cm_info->rem_port;
1069         cm_node->send_write0 = send_first;
1070         nes_debug(NES_DBG_CM, "Make node addresses : loc = %x:%x, rem = %x:%x\n",
1071                         cm_node->loc_addr, cm_node->loc_port, cm_node->rem_addr, cm_node->rem_port);
1072         cm_node->listener = listener;
1073         cm_node->netdev = nesvnic->netdev;
1074         cm_node->cm_id = cm_info->cm_id;
1075         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1076
1077         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n",
1078                         cm_node->listener, cm_node->cm_id);
1079
1080         INIT_LIST_HEAD(&cm_node->retrans_list);
1081         spin_lock_init(&cm_node->retrans_list_lock);
1082         INIT_LIST_HEAD(&cm_node->recv_list);
1083         spin_lock_init(&cm_node->recv_list_lock);
1084
1085         cm_node->loopbackpartner = NULL;
1086         atomic_set(&cm_node->ref_count, 1);
1087         /* associate our parent CM core */
1088         cm_node->cm_core = cm_core;
1089         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1090         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1091         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1092                         NES_CM_DEFAULT_RCV_WND_SCALE;
1093         ts = current_kernel_time();
1094         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1095         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1096                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1097         cm_node->tcp_cntxt.rcv_nxt = 0;
1098         /* get a unique session ID , add thread_id to an upcounter to handle race */
1099         atomic_inc(&cm_core->node_cnt);
1100         cm_node->conn_type = cm_info->conn_type;
1101         cm_node->apbvt_set = 0;
1102         cm_node->accept_pend = 0;
1103
1104         cm_node->nesvnic = nesvnic;
1105         /* get some device handles, for arp lookup */
1106         nesdev = nesvnic->nesdev;
1107         nesadapter = nesdev->nesadapter;
1108
1109         cm_node->loopbackpartner = NULL;
1110         /* get the mac addr for the remote node */
1111         arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1112         if (arpindex < 0) {
1113                 kfree(cm_node);
1114                 nes_addr_send_arp(cm_info->rem_addr);
1115                 return NULL;
1116         }
1117
1118         /* copy the mac addr to node context */
1119         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1120         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %s\n",
1121                   print_mac(mac, cm_node->rem_mac));
1122
1123         add_hte_node(cm_core, cm_node);
1124         atomic_inc(&cm_nodes_created);
1125
1126         return cm_node;
1127 }
1128
1129
1130 /**
1131  * add_ref_cm_node - destroy an instance of a cm node
1132  */
1133 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1134 {
1135         atomic_inc(&cm_node->ref_count);
1136         return 0;
1137 }
1138
1139
1140 /**
1141  * rem_ref_cm_node - destroy an instance of a cm node
1142  */
1143 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1144                 struct nes_cm_node *cm_node)
1145 {
1146         unsigned long flags, qplockflags;
1147         struct nes_timer_entry *send_entry;
1148         struct nes_timer_entry *recv_entry;
1149         struct iw_cm_id *cm_id;
1150         struct list_head *list_core, *list_node_temp;
1151         struct nes_qp *nesqp;
1152
1153         if (!cm_node)
1154                 return -EINVAL;
1155
1156         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1157         if (atomic_dec_return(&cm_node->ref_count)) {
1158                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1159                 return 0;
1160         }
1161         list_del(&cm_node->list);
1162         atomic_dec(&cm_core->ht_node_cnt);
1163         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1164
1165         /* if the node is destroyed before connection was accelerated */
1166         if (!cm_node->accelerated && cm_node->accept_pend) {
1167                 BUG_ON(!cm_node->listener);
1168                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1169                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1170         }
1171
1172         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1173         list_for_each_safe(list_core, list_node_temp, &cm_node->retrans_list) {
1174                 send_entry = container_of(list_core, struct nes_timer_entry, list);
1175                 list_del(&send_entry->list);
1176                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1177                 dev_kfree_skb_any(send_entry->skb);
1178                 kfree(send_entry);
1179                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1180                 continue;
1181         }
1182         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1183
1184         spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1185         list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
1186                 recv_entry = container_of(list_core, struct nes_timer_entry, list);
1187                 list_del(&recv_entry->list);
1188                 cm_id = cm_node->cm_id;
1189                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1190                 if (recv_entry->type == NES_TIMER_TYPE_CLOSE) {
1191                         nesqp = (struct nes_qp *)recv_entry->skb;
1192                         spin_lock_irqsave(&nesqp->lock, qplockflags);
1193                         if (nesqp->cm_id) {
1194                                 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: ****** HIT A NES_TIMER_TYPE_CLOSE"
1195                                                 " with something to do!!! ******\n",
1196                                                 nesqp->hwqp.qp_id, cm_id);
1197                                 nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
1198                                 nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
1199                                 nesqp->ibqp_state = IB_QPS_ERR;
1200                                 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1201                                 nes_cm_disconn(nesqp);
1202                         } else {
1203                                 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1204                                 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: ****** HIT A NES_TIMER_TYPE_CLOSE"
1205                                                 " with nothing to do!!! ******\n",
1206                                                 nesqp->hwqp.qp_id, cm_id);
1207                                 nes_rem_ref(&nesqp->ibqp);
1208                         }
1209                         cm_id->rem_ref(cm_id);
1210                 } else if (recv_entry->type == NES_TIMER_TYPE_RECV) {
1211                         dev_kfree_skb_any(recv_entry->skb);
1212                 }
1213                 kfree(recv_entry);
1214                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1215         }
1216         spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1217
1218         if (cm_node->listener) {
1219                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1220         } else {
1221                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1222                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1223                                         PCI_FUNC(cm_node->nesvnic->nesdev->pcidev->devfn),
1224                                         NES_MANAGE_APBVT_DEL);
1225                 }
1226         }
1227
1228         kfree(cm_node);
1229         atomic_dec(&cm_core->node_cnt);
1230         atomic_inc(&cm_nodes_destroyed);
1231
1232         return 0;
1233 }
1234
1235
1236 /**
1237  * process_options
1238  */
1239 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc, u32 optionsize, u32 syn_packet)
1240 {
1241         u32 tmp;
1242         u32 offset = 0;
1243         union all_known_options *all_options;
1244         char got_mss_option = 0;
1245
1246         while (offset < optionsize) {
1247                 all_options = (union all_known_options *)(optionsloc + offset);
1248                 switch (all_options->as_base.optionnum) {
1249                         case OPTION_NUMBER_END:
1250                                 offset = optionsize;
1251                                 break;
1252                         case OPTION_NUMBER_NONE:
1253                                 offset += 1;
1254                                 continue;
1255                         case OPTION_NUMBER_MSS:
1256                                 nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d Size: %d\n",
1257                                                 __func__,
1258                                                 all_options->as_mss.length, offset, optionsize);
1259                                 got_mss_option = 1;
1260                                 if (all_options->as_mss.length != 4) {
1261                                         return 1;
1262                                 } else {
1263                                         tmp = ntohs(all_options->as_mss.mss);
1264                                         if (tmp > 0 && tmp < cm_node->tcp_cntxt.mss)
1265                                                 cm_node->tcp_cntxt.mss = tmp;
1266                                 }
1267                                 break;
1268                         case OPTION_NUMBER_WINDOW_SCALE:
1269                                 cm_node->tcp_cntxt.snd_wscale = all_options->as_windowscale.shiftcount;
1270                                 break;
1271                         case OPTION_NUMBER_WRITE0:
1272                                 cm_node->send_write0 = 1;
1273                                 break;
1274                         default:
1275                                 nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1276                                                 all_options->as_base.optionnum);
1277                                 break;
1278                 }
1279                 offset += all_options->as_base.length;
1280         }
1281         if ((!got_mss_option) && (syn_packet))
1282                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1283         return 0;
1284 }
1285
1286
1287 /**
1288  * process_packet
1289  */
1290 static int process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1291                           struct nes_cm_core *cm_core)
1292 {
1293         int optionsize;
1294         int datasize;
1295         int ret = 0;
1296         struct tcphdr *tcph = tcp_hdr(skb);
1297         u32 inc_sequence;
1298         if (cm_node->state == NES_CM_STATE_SYN_SENT && tcph->syn) {
1299                 inc_sequence = ntohl(tcph->seq);
1300                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence;
1301         }
1302
1303         if ((!tcph) || (cm_node->state == NES_CM_STATE_TSA)) {
1304                 BUG_ON(!tcph);
1305                 atomic_inc(&cm_accel_dropped_pkts);
1306                 return -1;
1307         }
1308
1309         if (tcph->rst) {
1310                 atomic_inc(&cm_resets_recvd);
1311                 nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u. refcnt=%d\n",
1312                                 cm_node, cm_node->state, atomic_read(&cm_node->ref_count));
1313                 switch (cm_node->state) {
1314                         case NES_CM_STATE_LISTENING:
1315                                 rem_ref_cm_node(cm_core, cm_node);
1316                                 break;
1317                         case NES_CM_STATE_TSA:
1318                         case NES_CM_STATE_CLOSED:
1319                                 break;
1320                         case NES_CM_STATE_SYN_RCVD:
1321                                         nes_debug(NES_DBG_CM, "Received a reset for local 0x%08X:%04X,"
1322                                                         " remote 0x%08X:%04X, node state = %u\n",
1323                                                         cm_node->loc_addr, cm_node->loc_port,
1324                                                         cm_node->rem_addr, cm_node->rem_port,
1325                                                         cm_node->state);
1326                                 rem_ref_cm_node(cm_core, cm_node);
1327                                 break;
1328                         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1329                         case NES_CM_STATE_ESTABLISHED:
1330                         case NES_CM_STATE_MPAREQ_SENT:
1331                         default:
1332                                         nes_debug(NES_DBG_CM, "Received a reset for local 0x%08X:%04X,"
1333                                                         " remote 0x%08X:%04X, node state = %u refcnt=%d\n",
1334                                                         cm_node->loc_addr, cm_node->loc_port,
1335                                                         cm_node->rem_addr, cm_node->rem_port,
1336                                                         cm_node->state, atomic_read(&cm_node->ref_count));
1337                                 // create event
1338                                 cm_node->state = NES_CM_STATE_CLOSED;
1339
1340                                 create_event(cm_node, NES_CM_EVENT_ABORTED);
1341                                 break;
1342
1343                 }
1344                 return -1;
1345         }
1346
1347         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1348
1349         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1350         skb_pull(skb, tcph->doff << 2);
1351
1352         datasize = skb->len;
1353         inc_sequence = ntohl(tcph->seq);
1354         nes_debug(NES_DBG_CM, "datasize = %u, sequence = 0x%08X, ack_seq = 0x%08X,"
1355                         " rcv_nxt = 0x%08X Flags: %s %s.\n",
1356                         datasize, inc_sequence, ntohl(tcph->ack_seq),
1357                         cm_node->tcp_cntxt.rcv_nxt, (tcph->syn ? "SYN":""),
1358                         (tcph->ack ? "ACK":""));
1359
1360         if (!tcph->syn && (inc_sequence != cm_node->tcp_cntxt.rcv_nxt)
1361                 ) {
1362                 nes_debug(NES_DBG_CM, "dropping packet, datasize = %u, sequence = 0x%08X,"
1363                                 " ack_seq = 0x%08X, rcv_nxt = 0x%08X Flags: %s.\n",
1364                                 datasize, inc_sequence, ntohl(tcph->ack_seq),
1365                                 cm_node->tcp_cntxt.rcv_nxt, (tcph->ack ? "ACK":""));
1366                 if (cm_node->state == NES_CM_STATE_LISTENING) {
1367                         rem_ref_cm_node(cm_core, cm_node);
1368                 }
1369                 return -1;
1370         }
1371
1372                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1373
1374
1375         if (optionsize) {
1376                 u8 *optionsloc = (u8 *)&tcph[1];
1377                 if (process_options(cm_node, optionsloc, optionsize, (u32)tcph->syn)) {
1378                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n", __func__, cm_node);
1379                         send_reset(cm_node);
1380                         if (cm_node->state != NES_CM_STATE_SYN_SENT)
1381                         rem_ref_cm_node(cm_core, cm_node);
1382                         return 0;
1383                 }
1384         } else if (tcph->syn)
1385                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1386
1387         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1388                         cm_node->tcp_cntxt.snd_wscale;
1389
1390         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd) {
1391                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1392         }
1393
1394         if (tcph->ack) {
1395                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1396                 switch (cm_node->state) {
1397                         case NES_CM_STATE_SYN_RCVD:
1398                         case NES_CM_STATE_SYN_SENT:
1399                                 /* read and stash current sequence number */
1400                                 if (cm_node->tcp_cntxt.rem_ack_num != cm_node->tcp_cntxt.loc_seq_num) {
1401                                         nes_debug(NES_DBG_CM, "ERROR - cm_node->tcp_cntxt.rem_ack_num !="
1402                                                         " cm_node->tcp_cntxt.loc_seq_num\n");
1403                                         send_reset(cm_node);
1404                                         return 0;
1405                                 }
1406                                 if (cm_node->state == NES_CM_STATE_SYN_SENT)
1407                                         cm_node->state = NES_CM_STATE_ONE_SIDE_ESTABLISHED;
1408                                 else {
1409                                                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1410                                 }
1411                                 break;
1412                         case NES_CM_STATE_LAST_ACK:
1413                                 cm_node->state = NES_CM_STATE_CLOSED;
1414                                 break;
1415                         case NES_CM_STATE_FIN_WAIT1:
1416                                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1417                                 break;
1418                         case NES_CM_STATE_CLOSING:
1419                                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1420                                 /* need to schedule this to happen in 2MSL timeouts */
1421                                 cm_node->state = NES_CM_STATE_CLOSED;
1422                                 break;
1423                         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1424                         case NES_CM_STATE_ESTABLISHED:
1425                         case NES_CM_STATE_MPAREQ_SENT:
1426                         case NES_CM_STATE_CLOSE_WAIT:
1427                         case NES_CM_STATE_TIME_WAIT:
1428                         case NES_CM_STATE_CLOSED:
1429                                 break;
1430                         case NES_CM_STATE_LISTENING:
1431                                 nes_debug(NES_DBG_CM, "Received an ACK on a listening port (SYN %d)\n", tcph->syn);
1432                                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1433                                 send_reset(cm_node);
1434                                 /* send_reset bumps refcount, this should have been a new node */
1435                                 rem_ref_cm_node(cm_core, cm_node);
1436                                 return -1;
1437                                 break;
1438                         case NES_CM_STATE_TSA:
1439                                 nes_debug(NES_DBG_CM, "Received a packet with the ack bit set while in TSA state\n");
1440                                 break;
1441                         case NES_CM_STATE_UNKNOWN:
1442                         case NES_CM_STATE_INITED:
1443                         case NES_CM_STATE_ACCEPTING:
1444                         case NES_CM_STATE_FIN_WAIT2:
1445                         default:
1446                                 nes_debug(NES_DBG_CM, "Received ack from unknown state: %x\n",
1447                                                 cm_node->state);
1448                                 send_reset(cm_node);
1449                                 break;
1450                 }
1451         }
1452
1453         if (tcph->syn) {
1454                 if (cm_node->state == NES_CM_STATE_LISTENING) {
1455                         /* do not exceed backlog */
1456                         atomic_inc(&cm_node->listener->pend_accepts_cnt);
1457                         if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1458                                         cm_node->listener->backlog) {
1459                                 nes_debug(NES_DBG_CM, "drop syn due to backlog pressure \n");
1460                                 cm_backlog_drops++;
1461                                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1462                                 rem_ref_cm_node(cm_core, cm_node);
1463                                 return 0;
1464                         }
1465                         cm_node->accept_pend = 1;
1466
1467                 }
1468                 if (datasize == 0)
1469                         cm_node->tcp_cntxt.rcv_nxt ++;
1470
1471                 if (cm_node->state == NES_CM_STATE_LISTENING) {
1472                         cm_node->state = NES_CM_STATE_SYN_RCVD;
1473                         send_syn(cm_node, 1);
1474                 }
1475                 if (cm_node->state == NES_CM_STATE_ONE_SIDE_ESTABLISHED) {
1476                         cm_node->state = NES_CM_STATE_ESTABLISHED;
1477                         /* send final handshake ACK */
1478                         ret = send_ack(cm_node);
1479                         if (ret < 0)
1480                                 return ret;
1481
1482                                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1483                                 ret = send_mpa_request(cm_node);
1484                                 if (ret < 0)
1485                                         return ret;
1486                 }
1487         }
1488
1489         if (tcph->fin) {
1490                 cm_node->tcp_cntxt.rcv_nxt++;
1491                 switch (cm_node->state) {
1492                         case NES_CM_STATE_SYN_RCVD:
1493                         case NES_CM_STATE_SYN_SENT:
1494                         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1495                         case NES_CM_STATE_ESTABLISHED:
1496                         case NES_CM_STATE_ACCEPTING:
1497                         case NES_CM_STATE_MPAREQ_SENT:
1498                                 cm_node->state = NES_CM_STATE_CLOSE_WAIT;
1499                                 cm_node->state = NES_CM_STATE_LAST_ACK;
1500                                 ret = send_fin(cm_node, NULL);
1501                                 break;
1502                         case NES_CM_STATE_FIN_WAIT1:
1503                                 cm_node->state = NES_CM_STATE_CLOSING;
1504                                 ret = send_ack(cm_node);
1505                                 break;
1506                         case NES_CM_STATE_FIN_WAIT2:
1507                                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1508                                 cm_node->tcp_cntxt.loc_seq_num ++;
1509                                 ret = send_ack(cm_node);
1510                                 /* need to schedule this to happen in 2MSL timeouts */
1511                                 cm_node->state = NES_CM_STATE_CLOSED;
1512                                 break;
1513                         case NES_CM_STATE_CLOSE_WAIT:
1514                         case NES_CM_STATE_LAST_ACK:
1515                         case NES_CM_STATE_CLOSING:
1516                         case NES_CM_STATE_TSA:
1517                         default:
1518                                 nes_debug(NES_DBG_CM, "Received a fin while in %x state\n",
1519                                                 cm_node->state);
1520                                 ret = -EINVAL;
1521                                 break;
1522                 }
1523         }
1524
1525         if (datasize) {
1526                 u8 *dataloc = skb->data;
1527                 /* figure out what state we are in and handle transition to next state */
1528                 switch (cm_node->state) {
1529                         case NES_CM_STATE_LISTENING:
1530                         case NES_CM_STATE_SYN_RCVD:
1531                         case NES_CM_STATE_SYN_SENT:
1532                         case NES_CM_STATE_FIN_WAIT1:
1533                         case NES_CM_STATE_FIN_WAIT2:
1534                         case NES_CM_STATE_CLOSE_WAIT:
1535                         case NES_CM_STATE_LAST_ACK:
1536                         case NES_CM_STATE_CLOSING:
1537                                 break;
1538                         case  NES_CM_STATE_MPAREQ_SENT:
1539                                 /* recv the mpa res frame, ret=frame len (incl priv data) */
1540                                 ret = parse_mpa(cm_node, dataloc, datasize);
1541                                 if (ret < 0)
1542                                         break;
1543                                 /* set the req frame payload len in skb */
1544                                 /* we are done handling this state, set node to a TSA state */
1545                                 cm_node->state = NES_CM_STATE_TSA;
1546                                 send_ack(cm_node);
1547                                 create_event(cm_node, NES_CM_EVENT_CONNECTED);
1548                                 break;
1549
1550                         case  NES_CM_STATE_ESTABLISHED:
1551                                 /* we are expecting an MPA req frame */
1552                                 ret = parse_mpa(cm_node, dataloc, datasize);
1553                                 if (ret < 0) {
1554                                         break;
1555                                 }
1556                                 cm_node->state = NES_CM_STATE_TSA;
1557                                 send_ack(cm_node);
1558                                 /* we got a valid MPA request, create an event */
1559                                 create_event(cm_node, NES_CM_EVENT_MPA_REQ);
1560                                 break;
1561                         case  NES_CM_STATE_TSA:
1562                                 handle_exception_pkt(cm_node, skb);
1563                                 break;
1564                         case NES_CM_STATE_UNKNOWN:
1565                         case NES_CM_STATE_INITED:
1566                         default:
1567                                 ret = -1;
1568                 }
1569         }
1570
1571         return ret;
1572 }
1573
1574
1575 /**
1576  * mini_cm_listen - create a listen node with params
1577  */
1578 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1579                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1580 {
1581         struct nes_cm_listener *listener;
1582         unsigned long flags;
1583
1584         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1585                 cm_info->loc_addr, cm_info->loc_port);
1586
1587         /* cannot have multiple matching listeners */
1588         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1589                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1590         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1591                 /* find automatically incs ref count ??? */
1592                 atomic_dec(&listener->ref_count);
1593                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1594                 return NULL;
1595         }
1596
1597         if (!listener) {
1598                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1599                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1600                 if (!listener) {
1601                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1602                         return NULL;
1603                 }
1604
1605                 memset(listener, 0, sizeof(struct nes_cm_listener));
1606                 listener->loc_addr = htonl(cm_info->loc_addr);
1607                 listener->loc_port = htons(cm_info->loc_port);
1608                 listener->reused_node = 0;
1609
1610                 atomic_set(&listener->ref_count, 1);
1611         }
1612         /* pasive case */
1613         /* find already inc'ed the ref count */
1614         else {
1615                 listener->reused_node = 1;
1616         }
1617
1618         listener->cm_id = cm_info->cm_id;
1619         atomic_set(&listener->pend_accepts_cnt, 0);
1620         listener->cm_core = cm_core;
1621         listener->nesvnic = nesvnic;
1622         atomic_inc(&cm_core->node_cnt);
1623
1624         listener->conn_type = cm_info->conn_type;
1625         listener->backlog = cm_info->backlog;
1626         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1627
1628         if (!listener->reused_node) {
1629                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1630                 list_add(&listener->list, &cm_core->listen_list.list);
1631                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1632                 atomic_inc(&cm_core->listen_node_cnt);
1633         }
1634
1635         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
1636                         " listener = %p, backlog = %d, cm_id = %p.\n",
1637                         cm_info->loc_addr, cm_info->loc_port,
1638                         listener, listener->backlog, listener->cm_id);
1639
1640         return listener;
1641 }
1642
1643
1644 /**
1645  * mini_cm_connect - make a connection node with params
1646  */
1647 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1648                                            struct nes_vnic *nesvnic,
1649                                            struct ietf_mpa_frame *mpa_frame,
1650                                            struct nes_cm_info *cm_info)
1651 {
1652         int ret = 0;
1653         struct nes_cm_node *cm_node;
1654         struct nes_cm_listener *loopbackremotelistener;
1655         struct nes_cm_node *loopbackremotenode;
1656         struct nes_cm_info loopback_cm_info;
1657
1658         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) +
1659                         ntohs(mpa_frame->priv_data_len);
1660
1661         cm_info->loc_addr = htonl(cm_info->loc_addr);
1662         cm_info->rem_addr = htonl(cm_info->rem_addr);
1663         cm_info->loc_port = htons(cm_info->loc_port);
1664         cm_info->rem_port = htons(cm_info->rem_port);
1665
1666         /* create a CM connection node */
1667         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
1668         if (!cm_node)
1669                 return NULL;
1670
1671         // set our node side to client (active) side
1672         cm_node->tcp_cntxt.client = 1;
1673         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1674
1675         if (cm_info->loc_addr == cm_info->rem_addr) {
1676                 loopbackremotelistener = find_listener(cm_core, cm_node->rem_addr,
1677                                 cm_node->rem_port, NES_CM_LISTENER_ACTIVE_STATE);
1678                 if (loopbackremotelistener == NULL) {
1679                         create_event(cm_node, NES_CM_EVENT_ABORTED);
1680                 } else {
1681                         atomic_inc(&cm_loopbacks);
1682                         loopback_cm_info = *cm_info;
1683                         loopback_cm_info.loc_port = cm_info->rem_port;
1684                         loopback_cm_info.rem_port = cm_info->loc_port;
1685                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
1686                         loopbackremotenode = make_cm_node(cm_core, nesvnic, &loopback_cm_info,
1687                                         loopbackremotelistener);
1688                         loopbackremotenode->loopbackpartner = cm_node;
1689                         loopbackremotenode->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1690                         cm_node->loopbackpartner = loopbackremotenode;
1691                         memcpy(loopbackremotenode->mpa_frame_buf, &mpa_frame->priv_data,
1692                                         mpa_frame_size);
1693                         loopbackremotenode->mpa_frame_size = mpa_frame_size -
1694                                         sizeof(struct ietf_mpa_frame);
1695
1696                         // we are done handling this state, set node to a TSA state
1697                         cm_node->state = NES_CM_STATE_TSA;
1698                         cm_node->tcp_cntxt.rcv_nxt = loopbackremotenode->tcp_cntxt.loc_seq_num;
1699                         loopbackremotenode->tcp_cntxt.rcv_nxt = cm_node->tcp_cntxt.loc_seq_num;
1700                         cm_node->tcp_cntxt.max_snd_wnd = loopbackremotenode->tcp_cntxt.rcv_wnd;
1701                         loopbackremotenode->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
1702                         cm_node->tcp_cntxt.snd_wnd = loopbackremotenode->tcp_cntxt.rcv_wnd;
1703                         loopbackremotenode->tcp_cntxt.snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
1704                         cm_node->tcp_cntxt.snd_wscale = loopbackremotenode->tcp_cntxt.rcv_wscale;
1705                         loopbackremotenode->tcp_cntxt.snd_wscale = cm_node->tcp_cntxt.rcv_wscale;
1706
1707                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
1708                 }
1709                 return cm_node;
1710         }
1711
1712         /* set our node side to client (active) side */
1713         cm_node->tcp_cntxt.client = 1;
1714         /* init our MPA frame ptr */
1715         memcpy(&cm_node->mpa_frame, mpa_frame, mpa_frame_size);
1716         cm_node->mpa_frame_size = mpa_frame_size;
1717
1718         /* send a syn and goto syn sent state */
1719         cm_node->state = NES_CM_STATE_SYN_SENT;
1720         ret = send_syn(cm_node, 0);
1721
1722         nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X, port=0x%04x,"
1723                         " cm_node=%p, cm_id = %p.\n",
1724                         cm_node->rem_addr, cm_node->rem_port, cm_node, cm_node->cm_id);
1725
1726         return cm_node;
1727 }
1728
1729
1730 /**
1731  * mini_cm_accept - accept a connection
1732  * This function is never called
1733  */
1734 static int mini_cm_accept(struct nes_cm_core *cm_core, struct ietf_mpa_frame *mpa_frame,
1735                           struct nes_cm_node *cm_node)
1736 {
1737         return 0;
1738 }
1739
1740
1741 /**
1742  * mini_cm_reject - reject and teardown a connection
1743  */
1744 static int mini_cm_reject(struct nes_cm_core *cm_core,
1745                           struct ietf_mpa_frame *mpa_frame,
1746                           struct nes_cm_node *cm_node)
1747 {
1748         int ret = 0;
1749         struct sk_buff *skb;
1750         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) +
1751                         ntohs(mpa_frame->priv_data_len);
1752
1753         skb = get_free_pkt(cm_node);
1754         if (!skb) {
1755                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1756                 return -1;
1757         }
1758
1759         /* send an MPA Request frame */
1760         form_cm_frame(skb, cm_node, NULL, 0, mpa_frame, mpa_frame_size, SET_ACK | SET_FIN);
1761         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1762
1763         cm_node->state = NES_CM_STATE_CLOSED;
1764         ret = send_fin(cm_node, NULL);
1765
1766         if (ret < 0) {
1767                 printk(KERN_INFO PFX "failed to send MPA Reply (reject)\n");
1768                 return ret;
1769         }
1770
1771         return ret;
1772 }
1773
1774
1775 /**
1776  * mini_cm_close
1777  */
1778 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1779 {
1780         int ret = 0;
1781
1782         if (!cm_core || !cm_node)
1783                 return -EINVAL;
1784
1785         switch (cm_node->state) {
1786                 /* if passed in node is null, create a reference key node for node search */
1787                 /* check if we found an owner node for this pkt */
1788                 case NES_CM_STATE_SYN_RCVD:
1789                 case NES_CM_STATE_SYN_SENT:
1790                 case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1791                 case NES_CM_STATE_ESTABLISHED:
1792                 case NES_CM_STATE_ACCEPTING:
1793                 case NES_CM_STATE_MPAREQ_SENT:
1794                         cm_node->state = NES_CM_STATE_FIN_WAIT1;
1795                         send_fin(cm_node, NULL);
1796                         break;
1797                 case NES_CM_STATE_CLOSE_WAIT:
1798                         cm_node->state = NES_CM_STATE_LAST_ACK;
1799                         send_fin(cm_node, NULL);
1800                         break;
1801                 case NES_CM_STATE_FIN_WAIT1:
1802                 case NES_CM_STATE_FIN_WAIT2:
1803                 case NES_CM_STATE_LAST_ACK:
1804                 case NES_CM_STATE_TIME_WAIT:
1805                 case NES_CM_STATE_CLOSING:
1806                         ret = -1;
1807                         break;
1808                 case NES_CM_STATE_LISTENING:
1809                 case NES_CM_STATE_UNKNOWN:
1810                 case NES_CM_STATE_INITED:
1811                 case NES_CM_STATE_CLOSED:
1812                 case NES_CM_STATE_TSA:
1813                         ret = rem_ref_cm_node(cm_core, cm_node);
1814                         break;
1815         }
1816         cm_node->cm_id = NULL;
1817         return ret;
1818 }
1819
1820
1821 /**
1822  * recv_pkt - recv an ETHERNET packet, and process it through CM
1823  * node state machine
1824  */
1825 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core, struct nes_vnic *nesvnic,
1826                             struct sk_buff *skb)
1827 {
1828         struct nes_cm_node *cm_node = NULL;
1829         struct nes_cm_listener *listener = NULL;
1830         struct iphdr *iph;
1831         struct tcphdr *tcph;
1832         struct nes_cm_info nfo;
1833         int ret = 0;
1834
1835         if (!skb || skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
1836                 ret = -EINVAL;
1837                 goto out;
1838         }
1839
1840         iph = (struct iphdr *)skb->data;
1841         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
1842         skb_reset_network_header(skb);
1843         skb_set_transport_header(skb, sizeof(*tcph));
1844         skb->len = ntohs(iph->tot_len);
1845
1846         nfo.loc_addr = ntohl(iph->daddr);
1847         nfo.loc_port = ntohs(tcph->dest);
1848         nfo.rem_addr = ntohl(iph->saddr);
1849         nfo.rem_port = ntohs(tcph->source);
1850
1851         nes_debug(NES_DBG_CM, "Received packet: dest=0x%08X:0x%04X src=0x%08X:0x%04X\n",
1852                         iph->daddr, tcph->dest, iph->saddr, tcph->source);
1853
1854         /* note: this call is going to increment cm_node ref count */
1855         cm_node = find_node(cm_core,
1856                         nfo.rem_port, nfo.rem_addr,
1857                         nfo.loc_port, nfo.loc_addr);
1858
1859         if (!cm_node) {
1860                 listener = find_listener(cm_core, nfo.loc_addr, nfo.loc_port,
1861                                 NES_CM_LISTENER_ACTIVE_STATE);
1862                 if (listener) {
1863                         nfo.cm_id = listener->cm_id;
1864                         nfo.conn_type = listener->conn_type;
1865                 } else {
1866                         nfo.cm_id = NULL;
1867                         nfo.conn_type = 0;
1868                 }
1869
1870                 cm_node = make_cm_node(cm_core, nesvnic, &nfo, listener);
1871                 if (!cm_node) {
1872                         nes_debug(NES_DBG_CM, "Unable to allocate node\n");
1873                         if (listener) {
1874                                 nes_debug(NES_DBG_CM, "unable to allocate node and decrementing listener refcount\n");
1875                                 atomic_dec(&listener->ref_count);
1876                         }
1877                         ret = -1;
1878                         goto out;
1879                 }
1880                 if (!listener) {
1881                         nes_debug(NES_DBG_CM, "Packet found for unknown port %x refcnt=%d\n",
1882                                         nfo.loc_port, atomic_read(&cm_node->ref_count));
1883                         if (!tcph->rst) {
1884                                 nes_debug(NES_DBG_CM, "Packet found for unknown port=%d"
1885                                                 " rem_port=%d refcnt=%d\n",
1886                                                 nfo.loc_port, nfo.rem_port, atomic_read(&cm_node->ref_count));
1887
1888                                 cm_node->tcp_cntxt.rcv_nxt = ntohl(tcph->seq);
1889                                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1890                                 send_reset(cm_node);
1891                         }
1892                         rem_ref_cm_node(cm_core, cm_node);
1893                         ret = -1;
1894                         goto out;
1895                 }
1896                 add_ref_cm_node(cm_node);
1897                 cm_node->state = NES_CM_STATE_LISTENING;
1898         }
1899
1900         nes_debug(NES_DBG_CM, "Processing Packet for node %p, data = (%p):\n",
1901                         cm_node, skb->data);
1902         process_packet(cm_node, skb, cm_core);
1903
1904         rem_ref_cm_node(cm_core, cm_node);
1905         out:
1906         if (skb)
1907                 dev_kfree_skb_any(skb);
1908         return ret;
1909 }
1910
1911
1912 /**
1913  * nes_cm_alloc_core - allocate a top level instance of a cm core
1914  */
1915 static struct nes_cm_core *nes_cm_alloc_core(void)
1916 {
1917         int i;
1918
1919         struct nes_cm_core *cm_core;
1920         struct sk_buff *skb = NULL;
1921
1922         /* setup the CM core */
1923         /* alloc top level core control structure */
1924         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
1925         if (!cm_core)
1926                 return NULL;
1927
1928         INIT_LIST_HEAD(&cm_core->connected_nodes);
1929         init_timer(&cm_core->tcp_timer);
1930         cm_core->tcp_timer.function = nes_cm_timer_tick;
1931
1932         cm_core->mtu   = NES_CM_DEFAULT_MTU;
1933         cm_core->state = NES_CM_STATE_INITED;
1934         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
1935
1936         atomic_set(&cm_core->events_posted, 0);
1937
1938         /* init the packet lists */
1939         skb_queue_head_init(&cm_core->tx_free_list);
1940
1941         for (i = 0; i < NES_CM_DEFAULT_FRAME_CNT; i++) {
1942                 skb = dev_alloc_skb(cm_core->mtu);
1943                 if (!skb) {
1944                         kfree(cm_core);
1945                         return NULL;
1946                 }
1947                 /* add 'raw' skb to free frame list */
1948                 skb_queue_head(&cm_core->tx_free_list, skb);
1949         }
1950
1951         cm_core->api = &nes_cm_api;
1952
1953         spin_lock_init(&cm_core->ht_lock);
1954         spin_lock_init(&cm_core->listen_list_lock);
1955
1956         INIT_LIST_HEAD(&cm_core->listen_list.list);
1957
1958         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
1959
1960         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
1961         cm_core->event_wq = create_singlethread_workqueue("nesewq");
1962         cm_core->post_event = nes_cm_post_event;
1963         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
1964         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
1965
1966         print_core(cm_core);
1967         return cm_core;
1968 }
1969
1970
1971 /**
1972  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
1973  */
1974 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
1975 {
1976         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
1977
1978         if (!cm_core)
1979                 return -EINVAL;
1980
1981         barrier();
1982
1983         if (timer_pending(&cm_core->tcp_timer)) {
1984                 del_timer(&cm_core->tcp_timer);
1985         }
1986
1987         destroy_workqueue(cm_core->event_wq);
1988         destroy_workqueue(cm_core->disconn_wq);
1989         nes_debug(NES_DBG_CM, "\n");
1990         kfree(cm_core);
1991
1992         return 0;
1993 }
1994
1995
1996 /**
1997  * mini_cm_get
1998  */
1999 static int mini_cm_get(struct nes_cm_core *cm_core)
2000 {
2001         return cm_core->state;
2002 }
2003
2004
2005 /**
2006  * mini_cm_set
2007  */
2008 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2009 {
2010         int ret = 0;
2011
2012         switch (type) {
2013                 case NES_CM_SET_PKT_SIZE:
2014                         cm_core->mtu = value;
2015                         break;
2016                 case NES_CM_SET_FREE_PKT_Q_SIZE:
2017                         cm_core->free_tx_pkt_max = value;
2018                         break;
2019                 default:
2020                         /* unknown set option */
2021                         ret = -EINVAL;
2022         }
2023
2024         return ret;
2025 }
2026
2027
2028 /**
2029  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2030  * successfully exchanged when this is called
2031  */
2032 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2033 {
2034         int ret = 0;
2035
2036         if (!nesqp)
2037                 return -EINVAL;
2038
2039         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2040                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2041                         NES_QPCONTEXT_MISC_DROS);
2042
2043         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2044                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2045
2046         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2047
2048         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2049
2050         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2051                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2052
2053         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2054                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2055                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2056
2057         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2058                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2059                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2060
2061         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2062         nesqp->nesqp_context->ts_recent = 0;
2063         nesqp->nesqp_context->ts_age = 0;
2064         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2065         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2066         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2067         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2068                         cm_node->tcp_cntxt.rcv_wscale);
2069         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2070         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2071         nesqp->nesqp_context->srtt = 0;
2072         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2073         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2074         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2075         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2076         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2077         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2078
2079         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2080                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2081                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2082                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2083                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2084                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2085                         le32_to_cpu(nesqp->nesqp_context->misc));
2086         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2087         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2088         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2089
2090         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2091         cm_node->state = NES_CM_STATE_TSA;
2092
2093         return ret;
2094 }
2095
2096
2097 /**
2098  * nes_cm_disconn
2099  */
2100 int nes_cm_disconn(struct nes_qp *nesqp)
2101 {
2102         unsigned long flags;
2103
2104         spin_lock_irqsave(&nesqp->lock, flags);
2105         if (nesqp->disconn_pending == 0) {
2106                 nesqp->disconn_pending++;
2107                 spin_unlock_irqrestore(&nesqp->lock, flags);
2108                 /* nes_add_ref(&nesqp->ibqp); */
2109                 /* init our disconnect work element, to */
2110                 INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);
2111
2112                 queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
2113         } else {
2114                 spin_unlock_irqrestore(&nesqp->lock, flags);
2115                 nes_rem_ref(&nesqp->ibqp);
2116         }
2117
2118         return 0;
2119 }
2120
2121
2122 /**
2123  * nes_disconnect_worker
2124  */
2125 static void nes_disconnect_worker(struct work_struct *work)
2126 {
2127         struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);
2128
2129         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2130                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2131         nes_cm_disconn_true(nesqp);
2132 }
2133
2134
2135 /**
2136  * nes_cm_disconn_true
2137  */
2138 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2139 {
2140         unsigned long flags;
2141         int ret = 0;
2142         struct iw_cm_id *cm_id;
2143         struct iw_cm_event cm_event;
2144         struct nes_vnic *nesvnic;
2145         u16 last_ae;
2146         u8 original_hw_tcp_state;
2147         u8 original_ibqp_state;
2148         u8 issued_disconnect_reset = 0;
2149
2150         if (!nesqp) {
2151                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2152                 return -1;
2153         }
2154
2155         spin_lock_irqsave(&nesqp->lock, flags);
2156         cm_id = nesqp->cm_id;
2157         /* make sure we havent already closed this connection */
2158         if (!cm_id) {
2159                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2160                                 nesqp->hwqp.qp_id);
2161                 spin_unlock_irqrestore(&nesqp->lock, flags);
2162                 nes_rem_ref(&nesqp->ibqp);
2163                 return -1;
2164         }
2165
2166         nesvnic = to_nesvnic(nesqp->ibqp.device);
2167         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2168
2169         original_hw_tcp_state = nesqp->hw_tcp_state;
2170         original_ibqp_state   = nesqp->ibqp_state;
2171         last_ae = nesqp->last_aeq;
2172
2173
2174         nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);
2175
2176         if ((nesqp->cm_id) && (cm_id->event_handler)) {
2177                 if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2178                                 ((original_ibqp_state == IB_QPS_RTS) &&
2179                                 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2180                         atomic_inc(&cm_disconnects);
2181                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2182                         if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
2183                                 issued_disconnect_reset = 1;
2184                                 cm_event.status = IW_CM_EVENT_STATUS_RESET;
2185                                 nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event (status reset) for "
2186                                                 " QP%u, cm_id = %p. \n",
2187                                                 nesqp->hwqp.qp_id, cm_id);
2188                         } else {
2189                                 cm_event.status = IW_CM_EVENT_STATUS_OK;
2190                         }
2191
2192                         cm_event.local_addr = cm_id->local_addr;
2193                         cm_event.remote_addr = cm_id->remote_addr;
2194                         cm_event.private_data = NULL;
2195                         cm_event.private_data_len = 0;
2196
2197                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event for "
2198                                         " QP%u, SQ Head = %u, SQ Tail = %u. cm_id = %p, refcount = %u.\n",
2199                                         nesqp->hwqp.qp_id,
2200                                         nesqp->hwqp.sq_head, nesqp->hwqp.sq_tail, cm_id,
2201                                         atomic_read(&nesqp->refcount));
2202
2203                         spin_unlock_irqrestore(&nesqp->lock, flags);
2204                         ret = cm_id->event_handler(cm_id, &cm_event);
2205                         if (ret)
2206                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2207                         spin_lock_irqsave(&nesqp->lock, flags);
2208                 }
2209
2210                 nesqp->disconn_pending = 0;
2211                 /* There might have been another AE while the lock was released */
2212                 original_hw_tcp_state = nesqp->hw_tcp_state;
2213                 original_ibqp_state   = nesqp->ibqp_state;
2214                 last_ae = nesqp->last_aeq;
2215
2216                 if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
2217                                 ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2218                                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2219                                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2220                                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2221                         atomic_inc(&cm_closes);
2222                         nesqp->cm_id = NULL;
2223                         nesqp->in_disconnect = 0;
2224                         spin_unlock_irqrestore(&nesqp->lock, flags);
2225                         nes_disconnect(nesqp, 1);
2226
2227                         cm_id->provider_data = nesqp;
2228                         /* Send up the close complete event */
2229                         cm_event.event = IW_CM_EVENT_CLOSE;
2230                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2231                         cm_event.provider_data = cm_id->provider_data;
2232                         cm_event.local_addr = cm_id->local_addr;
2233                         cm_event.remote_addr = cm_id->remote_addr;
2234                         cm_event.private_data = NULL;
2235                         cm_event.private_data_len = 0;
2236
2237                         ret = cm_id->event_handler(cm_id, &cm_event);
2238                         if (ret) {
2239                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2240                         }
2241
2242                         cm_id->rem_ref(cm_id);
2243
2244                         spin_lock_irqsave(&nesqp->lock, flags);
2245                         if (nesqp->flush_issued == 0) {
2246                                 nesqp->flush_issued = 1;
2247                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2248                                 flush_wqes(nesvnic->nesdev, nesqp, NES_CQP_FLUSH_RQ, 1);
2249                         } else {
2250                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2251                         }
2252
2253                         /* This reference is from either ModifyQP or the AE processing,
2254                                         there is still a race here with modifyqp */
2255                         nes_rem_ref(&nesqp->ibqp);
2256
2257                 } else {
2258                         cm_id = nesqp->cm_id;
2259                         spin_unlock_irqrestore(&nesqp->lock, flags);
2260                         /* check to see if the inbound reset beat the outbound reset */
2261                         if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
2262                                 nes_debug(NES_DBG_CM, "QP%u: Decing refcount due to inbound reset"
2263                                                 " beating the outbound reset.\n",
2264                                                 nesqp->hwqp.qp_id);
2265                                 nes_rem_ref(&nesqp->ibqp);
2266                         }
2267                 }
2268         } else {
2269                 nesqp->disconn_pending = 0;
2270                 spin_unlock_irqrestore(&nesqp->lock, flags);
2271         }
2272         nes_rem_ref(&nesqp->ibqp);
2273
2274         return 0;
2275 }
2276
2277
2278 /**
2279  * nes_disconnect
2280  */
2281 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2282 {
2283         int ret = 0;
2284         struct nes_vnic *nesvnic;
2285         struct nes_device *nesdev;
2286
2287         nesvnic = to_nesvnic(nesqp->ibqp.device);
2288         if (!nesvnic)
2289                 return -EINVAL;
2290
2291         nesdev = nesvnic->nesdev;
2292
2293         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2294                         atomic_read(&nesvnic->netdev->refcnt));
2295
2296         if (nesqp->active_conn) {
2297
2298                 /* indicate this connection is NOT active */
2299                 nesqp->active_conn = 0;
2300         } else {
2301                 /* Need to free the Last Streaming Mode Message */
2302                 if (nesqp->ietf_frame) {
2303                         pci_free_consistent(nesdev->pcidev,
2304                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2305                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2306                 }
2307         }
2308
2309         /* close the CM node down if it is still active */
2310         if (nesqp->cm_node) {
2311                 nes_debug(NES_DBG_CM, "Call close API\n");
2312
2313                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2314                 nesqp->cm_node = NULL;
2315         }
2316
2317         return ret;
2318 }
2319
2320
2321 /**
2322  * nes_accept
2323  */
2324 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2325 {
2326         u64 u64temp;
2327         struct ib_qp *ibqp;
2328         struct nes_qp *nesqp;
2329         struct nes_vnic *nesvnic;
2330         struct nes_device *nesdev;
2331         struct nes_cm_node *cm_node;
2332         struct nes_adapter *adapter;
2333         struct ib_qp_attr attr;
2334         struct iw_cm_event cm_event;
2335         struct nes_hw_qp_wqe *wqe;
2336         struct nes_v4_quad nes_quad;
2337         u32 crc_value;
2338         int ret;
2339
2340         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2341         if (!ibqp)
2342                 return -EINVAL;
2343
2344         /* get all our handles */
2345         nesqp = to_nesqp(ibqp);
2346         nesvnic = to_nesvnic(nesqp->ibqp.device);
2347         nesdev = nesvnic->nesdev;
2348         adapter = nesdev->nesadapter;
2349
2350         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
2351                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
2352
2353         /* since this is from a listen, we were able to put node handle into cm_id */
2354         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2355
2356         /* associate the node with the QP */
2357         nesqp->cm_node = (void *)cm_node;
2358
2359         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu\n",
2360                         nesqp->hwqp.qp_id, cm_node, jiffies);
2361         atomic_inc(&cm_accepts);
2362
2363         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2364                         atomic_read(&nesvnic->netdev->refcnt));
2365
2366                 /* allocate the ietf frame and space for private data */
2367                 nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2368                                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2369                                 &nesqp->ietf_frame_pbase);
2370
2371                 if (!nesqp->ietf_frame) {
2372                         nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
2373                         return -ENOMEM;
2374                 }
2375
2376
2377                 /* setup the MPA frame */
2378                 nesqp->private_data_len = conn_param->private_data_len;
2379                 memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2380
2381                 memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2382                                 conn_param->private_data_len);
2383
2384                 nesqp->ietf_frame->priv_data_len = cpu_to_be16(conn_param->private_data_len);
2385                 nesqp->ietf_frame->rev = mpa_version;
2386                 nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2387
2388                 /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2389                 wqe = &nesqp->hwqp.sq_vbase[0];
2390
2391                 if (cm_id->remote_addr.sin_addr.s_addr != cm_id->local_addr.sin_addr.s_addr) {
2392                         u64temp = (unsigned long)nesqp;
2393                         u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2394                         set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2395                                             u64temp);
2396                         wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2397                                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING | NES_IWARP_SQ_WQE_WRPDU);
2398                         wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2399                                         cpu_to_le32(conn_param->private_data_len + sizeof(struct ietf_mpa_frame));
2400                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] =
2401                                         cpu_to_le32((u32)nesqp->ietf_frame_pbase);
2402                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] =
2403                                         cpu_to_le32((u32)((u64)nesqp->ietf_frame_pbase >> 32));
2404                         wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2405                                         cpu_to_le32(conn_param->private_data_len + sizeof(struct ietf_mpa_frame));
2406                         wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
2407
2408                         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2409                                         NES_QPCONTEXT_ORDIRD_LSMM_PRESENT | NES_QPCONTEXT_ORDIRD_WRPDU);
2410                 } else {
2411                         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2412                                         NES_QPCONTEXT_ORDIRD_WRPDU | NES_QPCONTEXT_ORDIRD_ALSMM));
2413                 }
2414                 nesqp->skip_lsmm = 1;
2415
2416
2417         /* Cache the cm_id in the qp */
2418         nesqp->cm_id = cm_id;
2419         cm_node->cm_id = cm_id;
2420
2421         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2422         cm_id->provider_data = nesqp;
2423         nesqp->active_conn   = 0;
2424
2425         nes_cm_init_tsa_conn(nesqp, cm_node);
2426
2427         nesqp->nesqp_context->tcpPorts[0] = cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2428         nesqp->nesqp_context->tcpPorts[1] = cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2429         nesqp->nesqp_context->ip0 = cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2430
2431         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2432                         (u32)PCI_FUNC(nesdev->pcidev->devfn) << NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2433
2434         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
2435                         nes_arp_table(nesdev, le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2436                         NES_ARP_RESOLVE) << 16);
2437
2438         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2439                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2440
2441         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2442
2443         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2444                         ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2445         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2446
2447         memset(&nes_quad, 0, sizeof(nes_quad));
2448         nes_quad.DstIpAdrIndex = cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2449         nes_quad.SrcIpadr      = cm_id->remote_addr.sin_addr.s_addr;
2450         nes_quad.TcpPorts[0]   = cm_id->remote_addr.sin_port;
2451         nes_quad.TcpPorts[1]   = cm_id->local_addr.sin_port;
2452
2453         /* Produce hash key */
2454         crc_value = get_crc_value(&nes_quad);
2455         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2456         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2457                         nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2458
2459         nesqp->hte_index &= adapter->hte_index_mask;
2460         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2461
2462         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2463
2464         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = 0x%08X:0x%04X,"
2465                         " rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + private data length=%zu.\n",
2466                         nesqp->hwqp.qp_id,
2467                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2468                         ntohs(cm_id->remote_addr.sin_port),
2469                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2470                         ntohs(cm_id->local_addr.sin_port),
2471                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2472                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2473                         conn_param->private_data_len+sizeof(struct ietf_mpa_frame));
2474
2475         attr.qp_state = IB_QPS_RTS;
2476         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2477
2478         /* notify OF layer that accept event was successfull */
2479         cm_id->add_ref(cm_id);
2480
2481         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2482         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2483         cm_event.provider_data = (void *)nesqp;
2484         cm_event.local_addr = cm_id->local_addr;
2485         cm_event.remote_addr = cm_id->remote_addr;
2486         cm_event.private_data = NULL;
2487         cm_event.private_data_len = 0;
2488         ret = cm_id->event_handler(cm_id, &cm_event);
2489         if (cm_node->loopbackpartner) {
2490                 cm_node->loopbackpartner->mpa_frame_size = nesqp->private_data_len;
2491                 /* copy entire MPA frame to our cm_node's frame */
2492                 memcpy(cm_node->loopbackpartner->mpa_frame_buf, nesqp->ietf_frame->priv_data,
2493                            nesqp->private_data_len);
2494                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2495         }
2496         if (ret)
2497                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
2498                                 __func__, __LINE__, ret);
2499
2500         return 0;
2501 }
2502
2503
2504 /**
2505  * nes_reject
2506  */
2507 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2508 {
2509         struct nes_cm_node *cm_node;
2510         struct nes_cm_core *cm_core;
2511
2512         atomic_inc(&cm_rejects);
2513         cm_node = (struct nes_cm_node *) cm_id->provider_data;
2514         cm_core = cm_node->cm_core;
2515         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
2516
2517         strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
2518         memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
2519
2520         cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
2521         cm_node->mpa_frame.rev = mpa_version;
2522         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
2523
2524         cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
2525
2526         return 0;
2527 }
2528
2529
2530 /**
2531  * nes_connect
2532  * setup and launch cm connect node
2533  */
2534 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2535 {
2536         struct ib_qp *ibqp;
2537         struct nes_qp *nesqp;
2538         struct nes_vnic *nesvnic;
2539         struct nes_device *nesdev;
2540         struct nes_cm_node *cm_node;
2541         struct nes_cm_info cm_info;
2542
2543         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2544         if (!ibqp)
2545                 return -EINVAL;
2546         nesqp = to_nesqp(ibqp);
2547         if (!nesqp)
2548                 return -EINVAL;
2549         nesvnic = to_nesvnic(nesqp->ibqp.device);
2550         if (!nesvnic)
2551                 return -EINVAL;
2552         nesdev  = nesvnic->nesdev;
2553         if (!nesdev)
2554                 return -EINVAL;
2555
2556         atomic_inc(&cm_connects);
2557
2558         nesqp->ietf_frame = kzalloc(sizeof(struct ietf_mpa_frame) +
2559                         conn_param->private_data_len, GFP_KERNEL);
2560         if (!nesqp->ietf_frame)
2561                 return -ENOMEM;
2562
2563         /* set qp as having an active connection */
2564         nesqp->active_conn = 1;
2565
2566         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = 0x%08X:0x%04X.\n",
2567                         nesqp->hwqp.qp_id,
2568                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2569                         ntohs(cm_id->remote_addr.sin_port),
2570                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2571                         ntohs(cm_id->local_addr.sin_port));
2572
2573         /* cache the cm_id in the qp */
2574         nesqp->cm_id = cm_id;
2575
2576         cm_id->provider_data = nesqp;
2577
2578         /* copy the private data */
2579         if (conn_param->private_data_len) {
2580                 memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2581                                 conn_param->private_data_len);
2582         }
2583
2584         nesqp->private_data_len = conn_param->private_data_len;
2585         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2586         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
2587         nes_debug(NES_DBG_CM, "mpa private data len =%u\n", conn_param->private_data_len);
2588
2589         strcpy(&nesqp->ietf_frame->key[0], IEFT_MPA_KEY_REQ);
2590         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2591         nesqp->ietf_frame->rev = IETF_MPA_VERSION;
2592         nesqp->ietf_frame->priv_data_len = htons(conn_param->private_data_len);
2593
2594         if (cm_id->local_addr.sin_addr.s_addr != cm_id->remote_addr.sin_addr.s_addr)
2595                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2596                                 PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2597
2598         /* set up the connection params for the node */
2599         cm_info.loc_addr = (cm_id->local_addr.sin_addr.s_addr);
2600         cm_info.loc_port = (cm_id->local_addr.sin_port);
2601         cm_info.rem_addr = (cm_id->remote_addr.sin_addr.s_addr);
2602         cm_info.rem_port = (cm_id->remote_addr.sin_port);
2603         cm_info.cm_id = cm_id;
2604         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2605
2606         cm_id->add_ref(cm_id);
2607         nes_add_ref(&nesqp->ibqp);
2608
2609         /* create a connect CM node connection */
2610         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic, nesqp->ietf_frame, &cm_info);
2611         if (!cm_node) {
2612                 if (cm_id->local_addr.sin_addr.s_addr != cm_id->remote_addr.sin_addr.s_addr)
2613                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2614                                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
2615                 nes_rem_ref(&nesqp->ibqp);
2616                 kfree(nesqp->ietf_frame);
2617                 nesqp->ietf_frame = NULL;
2618                 cm_id->rem_ref(cm_id);
2619                 return -ENOMEM;
2620         }
2621
2622         cm_node->apbvt_set = 1;
2623         nesqp->cm_node = cm_node;
2624
2625         return 0;
2626 }
2627
2628
2629 /**
2630  * nes_create_listen
2631  */
2632 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
2633 {
2634         struct nes_vnic *nesvnic;
2635         struct nes_cm_listener *cm_node;
2636         struct nes_cm_info cm_info;
2637         struct nes_adapter *adapter;
2638         int err;
2639
2640
2641         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
2642                         cm_id, ntohs(cm_id->local_addr.sin_port));
2643
2644         nesvnic = to_nesvnic(cm_id->device);
2645         if (!nesvnic)
2646                 return -EINVAL;
2647         adapter = nesvnic->nesdev->nesadapter;
2648         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
2649                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
2650
2651         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
2652                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
2653
2654         /* setup listen params in our api call struct */
2655         cm_info.loc_addr = nesvnic->local_ipaddr;
2656         cm_info.loc_port = cm_id->local_addr.sin_port;
2657         cm_info.backlog = backlog;
2658         cm_info.cm_id = cm_id;
2659
2660         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2661
2662
2663         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
2664         if (!cm_node) {
2665                 printk("%s[%u] Error returned from listen API call\n",
2666                                 __func__, __LINE__);
2667                 return -ENOMEM;
2668         }
2669
2670         cm_id->provider_data = cm_node;
2671
2672         if (!cm_node->reused_node) {
2673                 err = nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2674                                 PCI_FUNC(nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2675                 if (err) {
2676                         printk("nes_manage_apbvt call returned %d.\n", err);
2677                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
2678                         return err;
2679                 }
2680                 cm_listens_created++;
2681         }
2682
2683         cm_id->add_ref(cm_id);
2684         cm_id->provider_data = (void *)cm_node;
2685
2686
2687         return 0;
2688 }
2689
2690
2691 /**
2692  * nes_destroy_listen
2693  */
2694 int nes_destroy_listen(struct iw_cm_id *cm_id)
2695 {
2696         if (cm_id->provider_data)
2697                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
2698         else
2699                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
2700
2701         cm_id->rem_ref(cm_id);
2702
2703         return 0;
2704 }
2705
2706
2707 /**
2708  * nes_cm_recv
2709  */
2710 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
2711 {
2712         cm_packets_received++;
2713         if ((g_cm_core) && (g_cm_core->api)) {
2714                 g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
2715         } else {
2716                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
2717                                 " cm is not setup properly.\n");
2718         }
2719
2720         return 0;
2721 }
2722
2723
2724 /**
2725  * nes_cm_start
2726  * Start and init a cm core module
2727  */
2728 int nes_cm_start(void)
2729 {
2730         nes_debug(NES_DBG_CM, "\n");
2731         /* create the primary CM core, pass this handle to subsequent core inits */
2732         g_cm_core = nes_cm_alloc_core();
2733         if (g_cm_core) {
2734                 return 0;
2735         } else {
2736                 return -ENOMEM;
2737         }
2738 }
2739
2740
2741 /**
2742  * nes_cm_stop
2743  * stop and dealloc all cm core instances
2744  */
2745 int nes_cm_stop(void)
2746 {
2747         g_cm_core->api->destroy_cm_core(g_cm_core);
2748         return 0;
2749 }
2750
2751
2752 /**
2753  * cm_event_connected
2754  * handle a connected event, setup QPs and HW
2755  */
2756 static void cm_event_connected(struct nes_cm_event *event)
2757 {
2758         u64 u64temp;
2759         struct nes_qp *nesqp;
2760         struct nes_vnic *nesvnic;
2761         struct nes_device *nesdev;
2762         struct nes_cm_node *cm_node;
2763         struct nes_adapter *nesadapter;
2764         struct ib_qp_attr attr;
2765         struct iw_cm_id *cm_id;
2766         struct iw_cm_event cm_event;
2767         struct nes_hw_qp_wqe *wqe;
2768         struct nes_v4_quad nes_quad;
2769         u32 crc_value;
2770         int ret;
2771
2772         /* get all our handles */
2773         cm_node = event->cm_node;
2774         cm_id = cm_node->cm_id;
2775         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
2776         nesqp = (struct nes_qp *)cm_id->provider_data;
2777         nesvnic = to_nesvnic(nesqp->ibqp.device);
2778         nesdev = nesvnic->nesdev;
2779         nesadapter = nesdev->nesadapter;
2780
2781         if (nesqp->destroyed) {
2782                 return;
2783         }
2784         atomic_inc(&cm_connecteds);
2785         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
2786                         " local port 0x%04X. jiffies = %lu.\n",
2787                         nesqp->hwqp.qp_id,
2788                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2789                         ntohs(cm_id->remote_addr.sin_port),
2790                         ntohs(cm_id->local_addr.sin_port),
2791                         jiffies);
2792
2793         nes_cm_init_tsa_conn(nesqp, cm_node);
2794
2795         /* set the QP tsa context */
2796         nesqp->nesqp_context->tcpPorts[0] = cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2797         nesqp->nesqp_context->tcpPorts[1] = cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2798         nesqp->nesqp_context->ip0 = cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2799
2800         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2801                         (u32)PCI_FUNC(nesdev->pcidev->devfn) << NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2802         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
2803                         nes_arp_table(nesdev, le32_to_cpu(nesqp->nesqp_context->ip0),
2804                         NULL, NES_ARP_RESOLVE) << 16);
2805         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2806                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2807         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2808         nesqp->nesqp_context->ird_ord_sizes |=
2809                         cpu_to_le32((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
2810
2811         /* Adjust tail for not having a LSMM */
2812         nesqp->hwqp.sq_tail = 1;
2813
2814 #if defined(NES_SEND_FIRST_WRITE)
2815                 if (cm_node->send_write0) {
2816                         nes_debug(NES_DBG_CM, "Sending first write.\n");
2817                         wqe = &nesqp->hwqp.sq_vbase[0];
2818                         u64temp = (unsigned long)nesqp;
2819                         u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2820                         set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2821                                             u64temp);
2822                         wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] = cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
2823                         wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
2824                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
2825                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
2826                         wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
2827                         wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
2828
2829                         /* use the reserved spot on the WQ for the extra first WQE */
2830                         nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2831                                         NES_QPCONTEXT_ORDIRD_WRPDU | NES_QPCONTEXT_ORDIRD_ALSMM));
2832                         nesqp->skip_lsmm = 1;
2833                         nesqp->hwqp.sq_tail = 0;
2834                         nes_write32(nesdev->regs + NES_WQE_ALLOC,
2835                                         (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
2836                 }
2837 #endif
2838
2839         memset(&nes_quad, 0, sizeof(nes_quad));
2840
2841         nes_quad.DstIpAdrIndex = cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2842         nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2843         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2844         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2845
2846         /* Produce hash key */
2847         crc_value = get_crc_value(&nes_quad);
2848         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2849         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
2850                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
2851
2852         nesqp->hte_index &= nesadapter->hte_index_mask;
2853         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2854
2855         nesqp->ietf_frame = &cm_node->mpa_frame;
2856         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
2857         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2858
2859         /* modify QP state to rts */
2860         attr.qp_state = IB_QPS_RTS;
2861         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2862
2863         /* notify OF layer we successfully created the requested connection */
2864         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
2865         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2866         cm_event.provider_data = cm_id->provider_data;
2867         cm_event.local_addr.sin_family = AF_INET;
2868         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
2869         cm_event.remote_addr = cm_id->remote_addr;
2870
2871                 cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
2872                 cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
2873
2874         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
2875         ret = cm_id->event_handler(cm_id, &cm_event);
2876         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2877
2878         if (ret)
2879                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
2880                                 __func__, __LINE__, ret);
2881         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = %lu\n",
2882                         nesqp->hwqp.qp_id, jiffies );
2883
2884         nes_rem_ref(&nesqp->ibqp);
2885
2886         return;
2887 }
2888
2889
2890 /**
2891  * cm_event_connect_error
2892  */
2893 static void cm_event_connect_error(struct nes_cm_event *event)
2894 {
2895         struct nes_qp *nesqp;
2896         struct iw_cm_id *cm_id;
2897         struct iw_cm_event cm_event;
2898         /* struct nes_cm_info cm_info; */
2899         int ret;
2900
2901         if (!event->cm_node)
2902                 return;
2903
2904         cm_id = event->cm_node->cm_id;
2905         if (!cm_id) {
2906                 return;
2907         }
2908
2909         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
2910         nesqp = cm_id->provider_data;
2911
2912         if (!nesqp) {
2913                 return;
2914         }
2915
2916         /* notify OF layer about this connection error event */
2917         /* cm_id->rem_ref(cm_id); */
2918         nesqp->cm_id = NULL;
2919         cm_id->provider_data = NULL;
2920         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
2921         cm_event.status = IW_CM_EVENT_STATUS_REJECTED;
2922         cm_event.provider_data = cm_id->provider_data;
2923         cm_event.local_addr = cm_id->local_addr;
2924         cm_event.remote_addr = cm_id->remote_addr;
2925         cm_event.private_data = NULL;
2926         cm_event.private_data_len = 0;
2927
2928         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, remove_addr=%08x\n",
2929                         cm_event.local_addr.sin_addr.s_addr, cm_event.remote_addr.sin_addr.s_addr);
2930
2931         ret = cm_id->event_handler(cm_id, &cm_event);
2932         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2933         if (ret)
2934                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
2935                                 __func__, __LINE__, ret);
2936         nes_rem_ref(&nesqp->ibqp);
2937                 cm_id->rem_ref(cm_id);
2938
2939         return;
2940 }
2941
2942
2943 /**
2944  * cm_event_reset
2945  */
2946 static void cm_event_reset(struct nes_cm_event *event)
2947 {
2948         struct nes_qp *nesqp;
2949         struct iw_cm_id *cm_id;
2950         struct iw_cm_event cm_event;
2951         /* struct nes_cm_info cm_info; */
2952         int ret;
2953
2954         if (!event->cm_node)
2955                 return;
2956
2957         if (!event->cm_node->cm_id)
2958                 return;
2959
2960         cm_id = event->cm_node->cm_id;
2961
2962         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
2963         nesqp = cm_id->provider_data;
2964
2965         nesqp->cm_id = NULL;
2966         /* cm_id->provider_data = NULL; */
2967         cm_event.event = IW_CM_EVENT_DISCONNECT;
2968         cm_event.status = IW_CM_EVENT_STATUS_RESET;
2969         cm_event.provider_data = cm_id->provider_data;
2970         cm_event.local_addr = cm_id->local_addr;
2971         cm_event.remote_addr = cm_id->remote_addr;
2972         cm_event.private_data = NULL;
2973         cm_event.private_data_len = 0;
2974
2975         ret = cm_id->event_handler(cm_id, &cm_event);
2976         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2977
2978
2979         /* notify OF layer about this connection error event */
2980         cm_id->rem_ref(cm_id);
2981
2982         return;
2983 }
2984
2985
2986 /**
2987  * cm_event_mpa_req
2988  */
2989 static void cm_event_mpa_req(struct nes_cm_event *event)
2990 {
2991         struct iw_cm_id   *cm_id;
2992         struct iw_cm_event cm_event;
2993         int ret;
2994         struct nes_cm_node *cm_node;
2995
2996         cm_node = event->cm_node;
2997         if (!cm_node)
2998                 return;
2999         cm_id = cm_node->cm_id;
3000
3001         atomic_inc(&cm_connect_reqs);
3002         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3003                         cm_node, cm_id, jiffies);
3004
3005         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3006         cm_event.status = IW_CM_EVENT_STATUS_OK;
3007         cm_event.provider_data = (void *)cm_node;
3008
3009         cm_event.local_addr.sin_family = AF_INET;
3010         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3011         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3012
3013         cm_event.remote_addr.sin_family = AF_INET;
3014         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3015         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3016
3017                 cm_event.private_data                = cm_node->mpa_frame_buf;
3018                 cm_event.private_data_len            = (u8) cm_node->mpa_frame_size;
3019
3020         ret = cm_id->event_handler(cm_id, &cm_event);
3021         if (ret)
3022                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
3023                                 __func__, __LINE__, ret);
3024
3025         return;
3026 }
3027
3028
3029 static void nes_cm_event_handler(struct work_struct *);
3030
3031 /**
3032  * nes_cm_post_event
3033  * post an event to the cm event handler
3034  */
3035 static int nes_cm_post_event(struct nes_cm_event *event)
3036 {
3037         atomic_inc(&event->cm_node->cm_core->events_posted);
3038         add_ref_cm_node(event->cm_node);
3039         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3040         INIT_WORK(&event->event_work, nes_cm_event_handler);
3041         nes_debug(NES_DBG_CM, "queue_work, event=%p\n", event);
3042
3043         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3044
3045         nes_debug(NES_DBG_CM, "Exit\n");
3046         return 0;
3047 }
3048
3049
3050 /**
3051  * nes_cm_event_handler
3052  * worker function to handle cm events
3053  * will free instance of nes_cm_event
3054  */
3055 static void nes_cm_event_handler(struct work_struct *work)
3056 {
3057         struct nes_cm_event *event = container_of(work, struct nes_cm_event, event_work);
3058         struct nes_cm_core *cm_core;
3059
3060         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core)) {
3061                 return;
3062         }
3063         cm_core = event->cm_node->cm_core;
3064         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3065                         event, event->type, atomic_read(&cm_core->events_posted));
3066
3067         switch (event->type) {
3068                 case NES_CM_EVENT_MPA_REQ:
3069                         cm_event_mpa_req(event);
3070                         nes_debug(NES_DBG_CM, "CM Event: MPA REQUEST\n");
3071                         break;
3072                 case NES_CM_EVENT_RESET:
3073                         nes_debug(NES_DBG_CM, "CM Event: RESET\n");
3074                         cm_event_reset(event);
3075                         break;
3076                 case NES_CM_EVENT_CONNECTED:
3077                         if ((!event->cm_node->cm_id) ||
3078                                 (event->cm_node->state != NES_CM_STATE_TSA)) {
3079                                 break;
3080                         }
3081                         cm_event_connected(event);
3082                         nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3083                         break;
3084                 case NES_CM_EVENT_ABORTED:
3085                         if ((!event->cm_node->cm_id) || (event->cm_node->state == NES_CM_STATE_TSA)) {
3086                                 break;
3087                         }
3088                         cm_event_connect_error(event);
3089                         nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3090                         break;
3091                 case NES_CM_EVENT_DROPPED_PKT:
3092                         nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3093                         break;
3094                 default:
3095                         nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3096                         break;
3097         }
3098
3099         atomic_dec(&cm_core->events_posted);
3100         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3101         rem_ref_cm_node(cm_core, event->cm_node);
3102         kfree(event);
3103
3104         return;
3105 }