SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         nes_debug(NES_DBG_CM, "Session ID    : %u \n", atomic_read(&core->session_id));
 370
 371         nes_debug(NES_DBG_CM, "State         : %u \n",  core->state);
 372
 373         nes_debug(NES_DBG_CM, "Tx Free cnt   : %u \n", skb_queue_len(&core->tx_free_list));
 374         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
 375         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
 376
 377         nes_debug(NES_DBG_CM, "core          : %p \n", core);
 378
 379         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
 380 }
 381
 382
 383 /**
 384  * schedule_nes_timer
 385  * note - cm_node needs to be protected before calling this. Encase in:
 386  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 387  */
 388 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
 389                 enum nes_timer_type type, int send_retrans,
 390                 int close_when_complete)
 391 {
 392         unsigned long  flags;
 393         struct nes_cm_core *cm_core;
 394         struct nes_timer_entry *new_send;
 395         int ret = 0;
 396         u32 was_timer_set;
 397
 398         if (!cm_node)
 399                 return -EINVAL;
 400         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
 401         if (!new_send)
 402                 return -1;
 403
 404         /* new_send->timetosend = currenttime */
 405         new_send->retrycount = NES_DEFAULT_RETRYS;
 406         new_send->retranscount = NES_DEFAULT_RETRANS;
 407         new_send->skb = skb;
 408         new_send->timetosend = jiffies;
 409         new_send->type = type;
 410         new_send->netdev = cm_node->netdev;
 411         new_send->send_retrans = send_retrans;
 412         new_send->close_when_complete = close_when_complete;
 413
 414         if (type == NES_TIMER_TYPE_CLOSE) {
 415                 new_send->timetosend += (HZ/2); /* TODO: decide on the correct value here */
 416                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
 417                 list_add_tail(&new_send->list, &cm_node->recv_list);
 418                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
 419         }
 420
 421         if (type == NES_TIMER_TYPE_SEND) {
 422                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 423                 atomic_inc(&new_send->skb->users);
 424
 425                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
 426                 if (ret != NETDEV_TX_OK) {
 427                         nes_debug(NES_DBG_CM, "Error sending packet %p (jiffies = %lu)\n",
 428                                         new_send, jiffies);
 429                         atomic_dec(&new_send->skb->users);
 430                         new_send->timetosend = jiffies;
 431                 } else {
 432                         cm_packets_sent++;
 433                         if (!send_retrans) {
 434                                 if (close_when_complete)
 435                                         rem_ref_cm_node(cm_node->cm_core, cm_node);
 436                                 dev_kfree_skb_any(new_send->skb);
 437                                 kfree(new_send);
 438                                 return ret;
 439                         }
 440                         new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
 441                 }
 442                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 443                 list_add_tail(&new_send->list, &cm_node->retrans_list);
 444                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 445         }
 446         if (type == NES_TIMER_TYPE_RECV) {
 447                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 448                 new_send->timetosend = jiffies;
 449                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
 450                 list_add_tail(&new_send->list, &cm_node->recv_list);
 451                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
 452         }
 453         cm_core = cm_node->cm_core;
 454
 455         was_timer_set = timer_pending(&cm_core->tcp_timer);
 456
 457         if (!was_timer_set) {
 458                 cm_core->tcp_timer.expires = new_send->timetosend;
 459                 add_timer(&cm_core->tcp_timer);
 460         }
 461
 462         return ret;
 463 }
 464
 465
 466 /**
 467  * nes_cm_timer_tick
 468  */
 469 static void nes_cm_timer_tick(unsigned long pass)
 470 {
 471         unsigned long flags, qplockflags;
 472         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
 473         struct iw_cm_id *cm_id;
 474         struct nes_cm_node *cm_node;
 475         struct nes_timer_entry *send_entry, *recv_entry;
 476         struct list_head *list_core, *list_core_temp;
 477         struct list_head *list_node, *list_node_temp;
 478         struct nes_cm_core *cm_core = g_cm_core;
 479         struct nes_qp *nesqp;
 480         struct sk_buff *skb;
 481         u32 settimer = 0;
 482         int ret = NETDEV_TX_OK;
 483         int    node_done;
 484
 485         spin_lock_irqsave(&cm_core->ht_lock, flags);
 486
 487         list_for_each_safe(list_node, list_core_temp, &cm_core->connected_nodes) {
 488                 cm_node = container_of(list_node, struct nes_cm_node, list);
 489                 add_ref_cm_node(cm_node);
 490                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 491                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
 492                 list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
 493                         recv_entry = container_of(list_core, struct nes_timer_entry, list);
 494                         if ((time_after(recv_entry->timetosend, jiffies)) &&
 495                                         (recv_entry->type == NES_TIMER_TYPE_CLOSE)) {
 496                                 if (nexttimeout > recv_entry->timetosend || !settimer) {
 497                                         nexttimeout = recv_entry->timetosend;
 498                                         settimer = 1;
 499                                 }
 500                                 continue;
 501                         }
 502                         list_del(&recv_entry->list);
 503                         cm_id = cm_node->cm_id;
 504                         spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
 505                         if (recv_entry->type == NES_TIMER_TYPE_CLOSE) {
 506                                 nesqp = (struct nes_qp *)recv_entry->skb;
 507                                 spin_lock_irqsave(&nesqp->lock, qplockflags);
 508                                 if (nesqp->cm_id) {
 509                                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, refcount = %d: "
 510                                                         "****** HIT A NES_TIMER_TYPE_CLOSE"
 511                                                         " with something to do!!! ******\n",
 512                                                         nesqp->hwqp.qp_id, cm_id,
 513                                                         atomic_read(&nesqp->refcount));
 514                                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
 515                                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
 516                                         nesqp->ibqp_state = IB_QPS_ERR;
 517                                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 518                                         nes_cm_disconn(nesqp);
 519                                 } else {
 520                                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 521                                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, refcount = %d:"
 522                                                         " ****** HIT A NES_TIMER_TYPE_CLOSE"
 523                                                         " with nothing to do!!! ******\n",
 524                                                         nesqp->hwqp.qp_id, cm_id,
 525                                                         atomic_read(&nesqp->refcount));
 526                                         nes_rem_ref(&nesqp->ibqp);
 527                                 }
 528                                 if (cm_id)
 529                                         cm_id->rem_ref(cm_id);
 530                         }
 531                         kfree(recv_entry);
 532                         spin_lock_irqsave(&cm_node->recv_list_lock, flags);
 533                 }
 534                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
 535
 536                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 537                 node_done = 0;
 538                 list_for_each_safe(list_core, list_node_temp, &cm_node->retrans_list) {
 539                         if (node_done) {
 540                                 break;
 541                         }
 542                         send_entry = container_of(list_core, struct nes_timer_entry, list);
 543                         if (time_after(send_entry->timetosend, jiffies)) {
 544                                 if (cm_node->state != NES_CM_STATE_TSA) {
 545                                         if ((nexttimeout > send_entry->timetosend) || !settimer) {
 546                                                 nexttimeout = send_entry->timetosend;
 547                                                 settimer = 1;
 548                                         }
 549                                         node_done = 1;
 550                                         continue;
 551                                 } else {
 552                                         list_del(&send_entry->list);
 553                                         skb = send_entry->skb;
 554                                         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 555                                         dev_kfree_skb_any(skb);
 556                                         kfree(send_entry);
 557                                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 558                                         continue;
 559                                 }
 560                         }
 561                         if (send_entry->type == NES_TIMER_NODE_CLEANUP) {
 562                                 list_del(&send_entry->list);
 563                                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 564                                 kfree(send_entry);
 565                                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 566                                 continue;
 567                         }
 568                         if ((send_entry->seq_num < cm_node->tcp_cntxt.rem_ack_num) ||
 569                                         (cm_node->state == NES_CM_STATE_TSA) ||
 570                                         (cm_node->state == NES_CM_STATE_CLOSED)) {
 571                                 skb = send_entry->skb;
 572                                 list_del(&send_entry->list);
 573                                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 574                                 kfree(send_entry);
 575                                 dev_kfree_skb_any(skb);
 576                                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 577                                 continue;
 578                         }
 579
 580                         if (!send_entry->retranscount || !send_entry->retrycount) {
 581                                 cm_packets_dropped++;
 582                                 skb = send_entry->skb;
 583                                 list_del(&send_entry->list);
 584                                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 585                                 dev_kfree_skb_any(skb);
 586                                 kfree(send_entry);
 587                                 if (cm_node->state == NES_CM_STATE_SYN_RCVD) {
 588                                         /* this node never even generated an indication up to the cm */
 589                                         rem_ref_cm_node(cm_core, cm_node);
 590                                 } else {
 591                                         cm_node->state = NES_CM_STATE_CLOSED;
 592                                         create_event(cm_node, NES_CM_EVENT_ABORTED);
 593                                 }
 594                                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 595                                 continue;
 596                         }
 597                         /* this seems like the correct place, but leave send entry unprotected */
 598                         // spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 599                         atomic_inc(&send_entry->skb->users);
 600                         cm_packets_retrans++;
 601                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p for node %p,"
 602                                         " jiffies = %lu, time to send =  %lu, retranscount = %u, "
 603                                         "send_entry->seq_num = 0x%08X, cm_node->tcp_cntxt.rem_ack_num = 0x%08X\n",
 604                                         send_entry, cm_node, jiffies, send_entry->timetosend, send_entry->retranscount,
 605                                         send_entry->seq_num, cm_node->tcp_cntxt.rem_ack_num);
 606
 607                         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 608                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
 609                         if (ret != NETDEV_TX_OK) {
 610                                 cm_packets_bounced++;
 611                                 atomic_dec(&send_entry->skb->users);
 612                                 send_entry->retrycount--;
 613                                 nexttimeout = jiffies + NES_SHORT_TIME;
 614                                 settimer = 1;
 615                                 node_done = 1;
 616                                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 617                                 continue;
 618                         } else {
 619                                 cm_packets_sent++;
 620                         }
 621                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 622                         list_del(&send_entry->list);
 623                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = %u, retry count = %u.\n",
 624                                         send_entry->retranscount, send_entry->retrycount);
 625                         if (send_entry->send_retrans) {
 626                                 send_entry->retranscount--;
 627                                 send_entry->timetosend = jiffies + NES_RETRY_TIMEOUT;
 628                                 if (nexttimeout > send_entry->timetosend || !settimer) {
 629                                         nexttimeout = send_entry->timetosend;
 630                                         settimer = 1;
 631                                 }
 632                                 list_add(&send_entry->list, &cm_node->retrans_list);
 633                                 continue;
 634                         } else {
 635                                 int close_when_complete;
 636                                 skb = send_entry->skb;
 637                                 close_when_complete = send_entry->close_when_complete;
 638                                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 639                                 if (close_when_complete) {
 640                                         BUG_ON(atomic_read(&cm_node->ref_count) == 1);
 641                                         rem_ref_cm_node(cm_core, cm_node);
 642                                 }
 643                                 dev_kfree_skb_any(skb);
 644                                 kfree(send_entry);
 645                                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 646                                 continue;
 647                         }
 648                 }
 649                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 650
 651                 rem_ref_cm_node(cm_core, cm_node);
 652
 653                 spin_lock_irqsave(&cm_core->ht_lock, flags);
 654                 if (ret != NETDEV_TX_OK)
 655                         break;
 656         }
 657         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 658
 659         if (settimer) {
 660                 if (!timer_pending(&cm_core->tcp_timer)) {
 661                         cm_core->tcp_timer.expires  = nexttimeout;
 662                         add_timer(&cm_core->tcp_timer);
 663                 }
 664         }
 665 }
 666
 667
 668 /**
 669  * send_syn
 670  */
 671 static int send_syn(struct nes_cm_node *cm_node, u32 sendack)
 672 {
 673         int ret;
 674         int flags = SET_SYN;
 675         struct sk_buff *skb;
 676         char optionsbuffer[sizeof(struct option_mss) +
 677                         sizeof(struct option_windowscale) +
 678                         sizeof(struct option_base) + 1];
 679
 680         int optionssize = 0;
 681         /* Sending MSS option */
 682         union all_known_options *options;
 683
 684         if (!cm_node)
 685                 return -EINVAL;
 686
 687         options = (union all_known_options *)&optionsbuffer[optionssize];
 688         options->as_mss.optionnum = OPTION_NUMBER_MSS;
 689         options->as_mss.length = sizeof(struct option_mss);
 690         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
 691         optionssize += sizeof(struct option_mss);
 692
 693         options = (union all_known_options *)&optionsbuffer[optionssize];
 694         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
 695         options->as_windowscale.length = sizeof(struct option_windowscale);
 696         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
 697         optionssize += sizeof(struct option_windowscale);
 698
 699         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)
 700                         ) {
 701                 options = (union all_known_options *)&optionsbuffer[optionssize];
 702                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
 703                 options->as_base.length = sizeof(struct option_base);
 704                 optionssize += sizeof(struct option_base);
 705                 /* we need the size to be a multiple of 4 */
 706                 options = (union all_known_options *)&optionsbuffer[optionssize];
 707                 options->as_end = 1;
 708                 optionssize += 1;
 709                 options = (union all_known_options *)&optionsbuffer[optionssize];
 710                 options->as_end = 1;
 711                 optionssize += 1;
 712         }
 713
 714         options = (union all_known_options *)&optionsbuffer[optionssize];
 715         options->as_end = OPTION_NUMBER_END;
 716         optionssize += 1;
 717
 718         skb = get_free_pkt(cm_node);
 719         if (!skb) {
 720                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 721                 return -1;
 722         }
 723
 724         if (sendack)
 725                 flags |= SET_ACK;
 726
 727         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
 728         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 729
 730         return ret;
 731 }
 732
 733
 734 /**
 735  * send_reset
 736  */
 737 static int send_reset(struct nes_cm_node *cm_node)
 738 {
 739         int ret;
 740         struct sk_buff *skb = get_free_pkt(cm_node);
 741         int flags = SET_RST | SET_ACK;
 742
 743         if (!skb) {
 744                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 745                 return -1;
 746         }
 747
 748         add_ref_cm_node(cm_node);
 749         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
 750         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
 751
 752         return ret;
 753 }
 754
 755
 756 /**
 757  * send_ack
 758  */
 759 static int send_ack(struct nes_cm_node *cm_node)
 760 {
 761         int ret;
 762         struct sk_buff *skb = get_free_pkt(cm_node);
 763
 764         if (!skb) {
 765                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 766                 return -1;
 767         }
 768
 769         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
 770         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
 771
 772         return ret;
 773 }
 774
 775
 776 /**
 777  * send_fin
 778  */
 779 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
 780 {
 781         int ret;
 782
 783         /* if we didn't get a frame get one */
 784         if (!skb)
 785                 skb = get_free_pkt(cm_node);
 786
 787         if (!skb) {
 788                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 789                 return -1;
 790         }
 791
 792         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
 793         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 794
 795         return ret;
 796 }
 797
 798
 799 /**
 800  * get_free_pkt
 801  */
 802 static struct sk_buff *get_free_pkt(struct nes_cm_node *cm_node)
 803 {
 804         struct sk_buff *skb, *new_skb;
 805
 806         /* check to see if we need to repopulate the free tx pkt queue */
 807         if (skb_queue_len(&cm_node->cm_core->tx_free_list) < NES_CM_FREE_PKT_LO_WATERMARK) {
 808                 while (skb_queue_len(&cm_node->cm_core->tx_free_list) <
 809                                 cm_node->cm_core->free_tx_pkt_max) {
 810                         /* replace the frame we took, we won't get it back */
 811                         new_skb = dev_alloc_skb(cm_node->cm_core->mtu);
 812                         BUG_ON(!new_skb);
 813                         /* add a replacement frame to the free tx list head */
 814                         skb_queue_head(&cm_node->cm_core->tx_free_list, new_skb);
 815                 }
 816         }
 817
 818         skb = skb_dequeue(&cm_node->cm_core->tx_free_list);
 819
 820         return skb;
 821 }
 822
 823
 824 /**
 825  * make_hashkey - generate hash key from node tuple
 826  */
 827 static inline int make_hashkey(u16 loc_port, nes_addr_t loc_addr, u16 rem_port,
 828                 nes_addr_t rem_addr)
 829 {
 830         u32 hashkey = 0;
 831
 832         hashkey = loc_addr + rem_addr + loc_port + rem_port;
 833         hashkey = (hashkey % NES_CM_HASHTABLE_SIZE);
 834
 835         return hashkey;
 836 }
 837
 838
 839 /**
 840  * find_node - find a cm node that matches the reference cm node
 841  */
 842 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
 843                 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
 844 {
 845         unsigned long flags;
 846         u32 hashkey;
 847         struct list_head *list_pos;
 848         struct list_head *hte;
 849         struct nes_cm_node *cm_node;
 850
 851         /* make a hash index key for this packet */
 852         hashkey = make_hashkey(loc_port, loc_addr, rem_port, rem_addr);
 853
 854         /* get a handle on the hte */
 855         hte = &cm_core->connected_nodes;
 856
 857         nes_debug(NES_DBG_CM, "Searching for an owner node:%x:%x from core %p->%p\n",
 858                         loc_addr, loc_port, cm_core, hte);
 859
 860         /* walk list and find cm_node associated with this session ID */
 861         spin_lock_irqsave(&cm_core->ht_lock, flags);
 862         list_for_each(list_pos, hte) {
 863                 cm_node = container_of(list_pos, struct nes_cm_node, list);
 864                 /* compare quad, return node handle if a match */
 865                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
 866                                 cm_node->loc_addr, cm_node->loc_port,
 867                                 loc_addr, loc_port,
 868                                 cm_node->rem_addr, cm_node->rem_port,
 869                                 rem_addr, rem_port);
 870                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
 871                                 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
 872                         add_ref_cm_node(cm_node);
 873                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 874                         return cm_node;
 875                 }
 876         }
 877         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 878
 879         /* no owner node */
 880         return NULL;
 881 }
 882
 883
 884 /**
 885  * find_listener - find a cm node listening on this addr-port pair
 886  */
 887 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
 888                 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
 889 {
 890         unsigned long flags;
 891         struct list_head *listen_list;
 892         struct nes_cm_listener *listen_node;
 893
 894         /* walk list and find cm_node associated with this session ID */
 895         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 896         list_for_each(listen_list, &cm_core->listen_list.list) {
 897                 listen_node = container_of(listen_list, struct nes_cm_listener, list);
 898                 /* compare node pair, return node handle if a match */
 899                 if (((listen_node->loc_addr == dst_addr) ||
 900                                 listen_node->loc_addr == 0x00000000) &&
 901                                 (listen_node->loc_port == dst_port) &&
 902                                 (listener_state & listen_node->listener_state)) {
 903                         atomic_inc(&listen_node->ref_count);
 904                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 905                         return listen_node;
 906                 }
 907         }
 908         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 909
 910         nes_debug(NES_DBG_CM, "Unable to find listener- %x:%x\n",
 911                         dst_addr, dst_port);
 912
 913         /* no listener */
 914         return NULL;
 915 }
 916
 917
 918 /**
 919  * add_hte_node - add a cm node to the hash table
 920  */
 921 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
 922 {
 923         unsigned long flags;
 924         u32 hashkey;
 925         struct list_head *hte;
 926
 927         if (!cm_node || !cm_core)
 928                 return -EINVAL;
 929
 930         nes_debug(NES_DBG_CM, "Adding Node to Active Connection HT\n");
 931
 932         /* first, make an index into our hash table */
 933         hashkey = make_hashkey(cm_node->loc_port, cm_node->loc_addr,
 934                         cm_node->rem_port, cm_node->rem_addr);
 935         cm_node->hashkey = hashkey;
 936
 937         spin_lock_irqsave(&cm_core->ht_lock, flags);
 938
 939         /* get a handle on the hash table element (list head for this slot) */
 940         hte = &cm_core->connected_nodes;
 941         list_add_tail(&cm_node->list, hte);
 942         atomic_inc(&cm_core->ht_node_cnt);
 943
 944         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 945
 946         return 0;
 947 }
 948
 949
 950 /**
 951  * mini_cm_dec_refcnt_listen
 952  */
 953 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
 954                 struct nes_cm_listener *listener, int free_hanging_nodes)
 955 {
 956         int ret = 1;
 957         unsigned long flags;
 958         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 959         if (!atomic_dec_return(&listener->ref_count)) {
 960                 list_del(&listener->list);
 961
 962                 /* decrement our listen node count */
 963                 atomic_dec(&cm_core->listen_node_cnt);
 964
 965                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 966
 967                 if (listener->nesvnic) {
 968                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
 969                                         PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
 970                 }
 971
 972                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
 973
 974                 kfree(listener);
 975                 listener = NULL;
 976                 ret = 0;
 977                 cm_listens_destroyed++;
 978         } else {
 979                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 980         }
 981         if (listener) {
 982                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
 983                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
 984                                         " with non-zero pending accepts=%u\n",
 985                                         listener, atomic_read(&listener->pend_accepts_cnt));
 986         }
 987
 988         return ret;
 989 }
 990
 991
 992 /**
 993  * mini_cm_del_listen
 994  */
 995 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
 996                 struct nes_cm_listener *listener)
 997 {
 998         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
 999         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1000         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1001 }
1002
1003
1004 /**
1005  * mini_cm_accelerated
1006  */
1007 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1008                 struct nes_cm_node *cm_node)
1009 {
1010         u32 was_timer_set;
1011         cm_node->accelerated = 1;
1012
1013         if (cm_node->accept_pend) {
1014                 BUG_ON(!cm_node->listener);
1015                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1016                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1017         }
1018
1019         was_timer_set = timer_pending(&cm_core->tcp_timer);
1020         if (!was_timer_set) {
1021                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1022                 add_timer(&cm_core->tcp_timer);
1023         }
1024
1025         return 0;
1026 }
1027
1028
1029 /**
1030  * nes_addr_send_arp
1031  */
1032 static void nes_addr_send_arp(u32 dst_ip)
1033 {
1034         struct rtable *rt;
1035         struct flowi fl;
1036
1037         memset(&fl, 0, sizeof fl);
1038         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1039         if (ip_route_output_key(&init_net, &rt, &fl)) {
1040                 printk("%s: ip_route_output_key failed for 0x%08X\n",
1041                                 __FUNCTION__, dst_ip);
1042                 return;
1043         }
1044
1045         neigh_event_send(rt->u.dst.neighbour, NULL);
1046         ip_rt_put(rt);
1047 }
1048
1049
1050 /**
1051  * make_cm_node - create a new instance of a cm node
1052  */
1053 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1054                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1055                 struct nes_cm_listener *listener)
1056 {
1057         struct nes_cm_node *cm_node;
1058         struct timespec ts;
1059         int arpindex = 0;
1060         struct nes_device *nesdev;
1061         struct nes_adapter *nesadapter;
1062
1063         /* create an hte and cm_node for this instance */
1064         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1065         if (!cm_node)
1066                 return NULL;
1067
1068         /* set our node specific transport info */
1069         cm_node->loc_addr = cm_info->loc_addr;
1070         cm_node->rem_addr = cm_info->rem_addr;
1071         cm_node->loc_port = cm_info->loc_port;
1072         cm_node->rem_port = cm_info->rem_port;
1073         cm_node->send_write0 = send_first;
1074         nes_debug(NES_DBG_CM, "Make node addresses : loc = %x:%x, rem = %x:%x\n",
1075                         cm_node->loc_addr, cm_node->loc_port, cm_node->rem_addr, cm_node->rem_port);
1076         cm_node->listener = listener;
1077         cm_node->netdev = nesvnic->netdev;
1078         cm_node->cm_id = cm_info->cm_id;
1079         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1080
1081         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n",
1082                         cm_node->listener, cm_node->cm_id);
1083
1084         INIT_LIST_HEAD(&cm_node->retrans_list);
1085         spin_lock_init(&cm_node->retrans_list_lock);
1086         INIT_LIST_HEAD(&cm_node->recv_list);
1087         spin_lock_init(&cm_node->recv_list_lock);
1088
1089         cm_node->loopbackpartner = NULL;
1090         atomic_set(&cm_node->ref_count, 1);
1091         /* associate our parent CM core */
1092         cm_node->cm_core = cm_core;
1093         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1094         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1095         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1096                         NES_CM_DEFAULT_RCV_WND_SCALE;
1097         ts = current_kernel_time();
1098         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1099         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1100                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1101         cm_node->tcp_cntxt.rcv_nxt = 0;
1102         /* get a unique session ID , add thread_id to an upcounter to handle race */
1103         atomic_inc(&cm_core->node_cnt);
1104         atomic_inc(&cm_core->session_id);
1105         cm_node->session_id = (u32)(atomic_read(&cm_core->session_id) + current->tgid);
1106         cm_node->conn_type = cm_info->conn_type;
1107         cm_node->apbvt_set = 0;
1108         cm_node->accept_pend = 0;
1109
1110         cm_node->nesvnic = nesvnic;
1111         /* get some device handles, for arp lookup */
1112         nesdev = nesvnic->nesdev;
1113         nesadapter = nesdev->nesadapter;
1114
1115         cm_node->loopbackpartner = NULL;
1116         /* get the mac addr for the remote node */
1117         arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1118         if (arpindex < 0) {
1119                 kfree(cm_node);
1120                 nes_addr_send_arp(cm_info->rem_addr);
1121                 return NULL;
1122         }
1123
1124         /* copy the mac addr to node context */
1125         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1126         nes_debug(NES_DBG_CM, "Remote mac addr from arp table:%02x,"
1127                         " %02x, %02x, %02x, %02x, %02x\n",
1128                         cm_node->rem_mac[0], cm_node->rem_mac[1],
1129                         cm_node->rem_mac[2], cm_node->rem_mac[3],
1130                         cm_node->rem_mac[4], cm_node->rem_mac[5]);
1131
1132         add_hte_node(cm_core, cm_node);
1133         atomic_inc(&cm_nodes_created);
1134
1135         return cm_node;
1136 }
1137
1138
1139 /**
1140  * add_ref_cm_node - destroy an instance of a cm node
1141  */
1142 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1143 {
1144         atomic_inc(&cm_node->ref_count);
1145         return 0;
1146 }
1147
1148
1149 /**
1150  * rem_ref_cm_node - destroy an instance of a cm node
1151  */
1152 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1153                 struct nes_cm_node *cm_node)
1154 {
1155         unsigned long flags, qplockflags;
1156         struct nes_timer_entry *send_entry;
1157         struct nes_timer_entry *recv_entry;
1158         struct iw_cm_id *cm_id;
1159         struct list_head *list_core, *list_node_temp;
1160         struct nes_qp *nesqp;
1161
1162         if (!cm_node)
1163                 return -EINVAL;
1164
1165         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1166         if (atomic_dec_return(&cm_node->ref_count)) {
1167                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1168                 return 0;
1169         }
1170         list_del(&cm_node->list);
1171         atomic_dec(&cm_core->ht_node_cnt);
1172         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1173
1174         /* if the node is destroyed before connection was accelerated */
1175         if (!cm_node->accelerated && cm_node->accept_pend) {
1176                 BUG_ON(!cm_node->listener);
1177                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1178                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1179         }
1180
1181         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1182         list_for_each_safe(list_core, list_node_temp, &cm_node->retrans_list) {
1183                 send_entry = container_of(list_core, struct nes_timer_entry, list);
1184                 list_del(&send_entry->list);
1185                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1186                 dev_kfree_skb_any(send_entry->skb);
1187                 kfree(send_entry);
1188                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1189                 continue;
1190         }
1191         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1192
1193         spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1194         list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
1195                 recv_entry = container_of(list_core, struct nes_timer_entry, list);
1196                 list_del(&recv_entry->list);
1197                 cm_id = cm_node->cm_id;
1198                 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1199                 if (recv_entry->type == NES_TIMER_TYPE_CLOSE) {
1200                         nesqp = (struct nes_qp *)recv_entry->skb;
1201                         spin_lock_irqsave(&nesqp->lock, qplockflags);
1202                         if (nesqp->cm_id) {
1203                                 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: ****** HIT A NES_TIMER_TYPE_CLOSE"
1204                                                 " with something to do!!! ******\n",
1205                                                 nesqp->hwqp.qp_id, cm_id);
1206                                 nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
1207                                 nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
1208                                 nesqp->ibqp_state = IB_QPS_ERR;
1209                                 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1210                                 nes_cm_disconn(nesqp);
1211                         } else {
1212                                 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1213                                 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: ****** HIT A NES_TIMER_TYPE_CLOSE"
1214                                                 " with nothing to do!!! ******\n",
1215                                                 nesqp->hwqp.qp_id, cm_id);
1216                                 nes_rem_ref(&nesqp->ibqp);
1217                         }
1218                         cm_id->rem_ref(cm_id);
1219                 } else if (recv_entry->type == NES_TIMER_TYPE_RECV) {
1220                         dev_kfree_skb_any(recv_entry->skb);
1221                 }
1222                 kfree(recv_entry);
1223                 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1224         }
1225         spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1226
1227         if (cm_node->listener) {
1228                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1229         } else {
1230                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1231                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1232                                         PCI_FUNC(cm_node->nesvnic->nesdev->pcidev->devfn),
1233                                         NES_MANAGE_APBVT_DEL);
1234                 }
1235         }
1236
1237         kfree(cm_node);
1238         atomic_dec(&cm_core->node_cnt);
1239         atomic_inc(&cm_nodes_destroyed);
1240
1241         return 0;
1242 }
1243
1244
1245 /**
1246  * process_options
1247  */
1248 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc, u32 optionsize, u32 syn_packet)
1249 {
1250         u32 tmp;
1251         u32 offset = 0;
1252         union all_known_options *all_options;
1253         char got_mss_option = 0;
1254
1255         while (offset < optionsize) {
1256                 all_options = (union all_known_options *)(optionsloc + offset);
1257                 switch (all_options->as_base.optionnum) {
1258                         case OPTION_NUMBER_END:
1259                                 offset = optionsize;
1260                                 break;
1261                         case OPTION_NUMBER_NONE:
1262                                 offset += 1;
1263                                 continue;
1264                         case OPTION_NUMBER_MSS:
1265                                 nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d Size: %d\n",
1266                                                 __FUNCTION__,
1267                                                 all_options->as_mss.length, offset, optionsize);
1268                                 got_mss_option = 1;
1269                                 if (all_options->as_mss.length != 4) {
1270                                         return 1;
1271                                 } else {
1272                                         tmp = ntohs(all_options->as_mss.mss);
1273                                         if (tmp > 0 && tmp < cm_node->tcp_cntxt.mss)
1274                                                 cm_node->tcp_cntxt.mss = tmp;
1275                                 }
1276                                 break;
1277                         case OPTION_NUMBER_WINDOW_SCALE:
1278                                 cm_node->tcp_cntxt.snd_wscale = all_options->as_windowscale.shiftcount;
1279                                 break;
1280                         case OPTION_NUMBER_WRITE0:
1281                                 cm_node->send_write0 = 1;
1282                                 break;
1283                         default:
1284                                 nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1285                                                 all_options->as_base.optionnum);
1286                                 break;
1287                 }
1288                 offset += all_options->as_base.length;
1289         }
1290         if ((!got_mss_option) && (syn_packet))
1291                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1292         return 0;
1293 }
1294
1295
1296 /**
1297  * process_packet
1298  */
1299 static int process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1300                           struct nes_cm_core *cm_core)
1301 {
1302         int optionsize;
1303         int datasize;
1304         int ret = 0;
1305         struct tcphdr *tcph = tcp_hdr(skb);
1306         u32 inc_sequence;
1307         if (cm_node->state == NES_CM_STATE_SYN_SENT && tcph->syn) {
1308                 inc_sequence = ntohl(tcph->seq);
1309                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence;
1310         }
1311
1312         if ((!tcph) || (cm_node->state == NES_CM_STATE_TSA)) {
1313                 BUG_ON(!tcph);
1314                 atomic_inc(&cm_accel_dropped_pkts);
1315                 return -1;
1316         }
1317
1318         if (tcph->rst) {
1319                 atomic_inc(&cm_resets_recvd);
1320                 nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u. refcnt=%d\n",
1321                                 cm_node, cm_node->state, atomic_read(&cm_node->ref_count));
1322                 switch (cm_node->state) {
1323                         case NES_CM_STATE_LISTENING:
1324                                 rem_ref_cm_node(cm_core, cm_node);
1325                                 break;
1326                         case NES_CM_STATE_TSA:
1327                         case NES_CM_STATE_CLOSED:
1328                                 break;
1329                         case NES_CM_STATE_SYN_RCVD:
1330                                         nes_debug(NES_DBG_CM, "Received a reset for local 0x%08X:%04X,"
1331                                                         " remote 0x%08X:%04X, node state = %u\n",
1332                                                         cm_node->loc_addr, cm_node->loc_port,
1333                                                         cm_node->rem_addr, cm_node->rem_port,
1334                                                         cm_node->state);
1335                                 rem_ref_cm_node(cm_core, cm_node);
1336                                 break;
1337                         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1338                         case NES_CM_STATE_ESTABLISHED:
1339                         case NES_CM_STATE_MPAREQ_SENT:
1340                         default:
1341                                         nes_debug(NES_DBG_CM, "Received a reset for local 0x%08X:%04X,"
1342                                                         " remote 0x%08X:%04X, node state = %u refcnt=%d\n",
1343                                                         cm_node->loc_addr, cm_node->loc_port,
1344                                                         cm_node->rem_addr, cm_node->rem_port,
1345                                                         cm_node->state, atomic_read(&cm_node->ref_count));
1346                                 // create event
1347                                 cm_node->state = NES_CM_STATE_CLOSED;
1348
1349                                 create_event(cm_node, NES_CM_EVENT_ABORTED);
1350                                 break;
1351
1352                 }
1353                 return -1;
1354         }
1355
1356         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1357
1358         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1359         skb_pull(skb, tcph->doff << 2);
1360
1361         datasize = skb->len;
1362         inc_sequence = ntohl(tcph->seq);
1363         nes_debug(NES_DBG_CM, "datasize = %u, sequence = 0x%08X, ack_seq = 0x%08X,"
1364                         " rcv_nxt = 0x%08X Flags: %s %s.\n",
1365                         datasize, inc_sequence, ntohl(tcph->ack_seq),
1366                         cm_node->tcp_cntxt.rcv_nxt, (tcph->syn ? "SYN":""),
1367                         (tcph->ack ? "ACK":""));
1368
1369         if (!tcph->syn && (inc_sequence != cm_node->tcp_cntxt.rcv_nxt)
1370                 ) {
1371                 nes_debug(NES_DBG_CM, "dropping packet, datasize = %u, sequence = 0x%08X,"
1372                                 " ack_seq = 0x%08X, rcv_nxt = 0x%08X Flags: %s.\n",
1373                                 datasize, inc_sequence, ntohl(tcph->ack_seq),
1374                                 cm_node->tcp_cntxt.rcv_nxt, (tcph->ack ? "ACK":""));
1375                 if (cm_node->state == NES_CM_STATE_LISTENING) {
1376                         rem_ref_cm_node(cm_core, cm_node);
1377                 }
1378                 return -1;
1379         }
1380
1381                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1382
1383
1384         if (optionsize) {
1385                 u8 *optionsloc = (u8 *)&tcph[1];
1386                 if (process_options(cm_node, optionsloc, optionsize, (u32)tcph->syn)) {
1387                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n", __FUNCTION__, cm_node);
1388                         send_reset(cm_node);
1389                         if (cm_node->state != NES_CM_STATE_SYN_SENT)
1390                         rem_ref_cm_node(cm_core, cm_node);
1391                         return 0;
1392                 }
1393         } else if (tcph->syn)
1394                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1395
1396         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1397                         cm_node->tcp_cntxt.snd_wscale;
1398
1399         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd) {
1400                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1401         }
1402
1403         if (tcph->ack) {
1404                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1405                 switch (cm_node->state) {
1406                         case NES_CM_STATE_SYN_RCVD:
1407                         case NES_CM_STATE_SYN_SENT:
1408                                 /* read and stash current sequence number */
1409                                 if (cm_node->tcp_cntxt.rem_ack_num != cm_node->tcp_cntxt.loc_seq_num) {
1410                                         nes_debug(NES_DBG_CM, "ERROR - cm_node->tcp_cntxt.rem_ack_num !="
1411                                                         " cm_node->tcp_cntxt.loc_seq_num\n");
1412                                         send_reset(cm_node);
1413                                         return 0;
1414                                 }
1415                                 if (cm_node->state == NES_CM_STATE_SYN_SENT)
1416                                         cm_node->state = NES_CM_STATE_ONE_SIDE_ESTABLISHED;
1417                                 else {
1418                                                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1419                                 }
1420                                 break;
1421                         case NES_CM_STATE_LAST_ACK:
1422                                 cm_node->state = NES_CM_STATE_CLOSED;
1423                                 break;
1424                         case NES_CM_STATE_FIN_WAIT1:
1425                                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1426                                 break;
1427                         case NES_CM_STATE_CLOSING:
1428                                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1429                                 /* need to schedule this to happen in 2MSL timeouts */
1430                                 cm_node->state = NES_CM_STATE_CLOSED;
1431                                 break;
1432                         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1433                         case NES_CM_STATE_ESTABLISHED:
1434                         case NES_CM_STATE_MPAREQ_SENT:
1435                         case NES_CM_STATE_CLOSE_WAIT:
1436                         case NES_CM_STATE_TIME_WAIT:
1437                         case NES_CM_STATE_CLOSED:
1438                                 break;
1439                         case NES_CM_STATE_LISTENING:
1440                                 nes_debug(NES_DBG_CM, "Received an ACK on a listening port (SYN %d)\n", tcph->syn);
1441                                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1442                                 send_reset(cm_node);
1443                                 /* send_reset bumps refcount, this should have been a new node */
1444                                 rem_ref_cm_node(cm_core, cm_node);
1445                                 return -1;
1446                                 break;
1447                         case NES_CM_STATE_TSA:
1448                                 nes_debug(NES_DBG_CM, "Received a packet with the ack bit set while in TSA state\n");
1449                                 break;
1450                         case NES_CM_STATE_UNKNOWN:
1451                         case NES_CM_STATE_INITED:
1452                         case NES_CM_STATE_ACCEPTING:
1453                         case NES_CM_STATE_FIN_WAIT2:
1454                         default:
1455                                 nes_debug(NES_DBG_CM, "Received ack from unknown state: %x\n",
1456                                                 cm_node->state);
1457                                 send_reset(cm_node);
1458                                 break;
1459                 }
1460         }
1461
1462         if (tcph->syn) {
1463                 if (cm_node->state == NES_CM_STATE_LISTENING) {
1464                         /* do not exceed backlog */
1465                         atomic_inc(&cm_node->listener->pend_accepts_cnt);
1466                         if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1467                                         cm_node->listener->backlog) {
1468                                 nes_debug(NES_DBG_CM, "drop syn due to backlog pressure \n");
1469                                 cm_backlog_drops++;
1470                                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1471                                 rem_ref_cm_node(cm_core, cm_node);
1472                                 return 0;
1473                         }
1474                         cm_node->accept_pend = 1;
1475
1476                 }
1477                 if (datasize == 0)
1478                         cm_node->tcp_cntxt.rcv_nxt ++;
1479
1480                 if (cm_node->state == NES_CM_STATE_LISTENING) {
1481                         cm_node->state = NES_CM_STATE_SYN_RCVD;
1482                         send_syn(cm_node, 1);
1483                 }
1484                 if (cm_node->state == NES_CM_STATE_ONE_SIDE_ESTABLISHED) {
1485                         cm_node->state = NES_CM_STATE_ESTABLISHED;
1486                         /* send final handshake ACK */
1487                         ret = send_ack(cm_node);
1488                         if (ret < 0)
1489                                 return ret;
1490
1491                                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1492                                 ret = send_mpa_request(cm_node);
1493                                 if (ret < 0)
1494                                         return ret;
1495                 }
1496         }
1497
1498         if (tcph->fin) {
1499                 cm_node->tcp_cntxt.rcv_nxt++;
1500                 switch (cm_node->state) {
1501                         case NES_CM_STATE_SYN_RCVD:
1502                         case NES_CM_STATE_SYN_SENT:
1503                         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1504                         case NES_CM_STATE_ESTABLISHED:
1505                         case NES_CM_STATE_ACCEPTING:
1506                         case NES_CM_STATE_MPAREQ_SENT:
1507                                 cm_node->state = NES_CM_STATE_CLOSE_WAIT;
1508                                 cm_node->state = NES_CM_STATE_LAST_ACK;
1509                                 ret = send_fin(cm_node, NULL);
1510                                 break;
1511                         case NES_CM_STATE_FIN_WAIT1:
1512                                 cm_node->state = NES_CM_STATE_CLOSING;
1513                                 ret = send_ack(cm_node);
1514                                 break;
1515                         case NES_CM_STATE_FIN_WAIT2:
1516                                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1517                                 cm_node->tcp_cntxt.loc_seq_num ++;
1518                                 ret = send_ack(cm_node);
1519                                 /* need to schedule this to happen in 2MSL timeouts */
1520                                 cm_node->state = NES_CM_STATE_CLOSED;
1521                                 break;
1522                         case NES_CM_STATE_CLOSE_WAIT:
1523                         case NES_CM_STATE_LAST_ACK:
1524                         case NES_CM_STATE_CLOSING:
1525                         case NES_CM_STATE_TSA:
1526                         default:
1527                                 nes_debug(NES_DBG_CM, "Received a fin while in %x state\n",
1528                                                 cm_node->state);
1529                                 ret = -EINVAL;
1530                                 break;
1531                 }
1532         }
1533
1534         if (datasize) {
1535                 u8 *dataloc = skb->data;
1536                 /* figure out what state we are in and handle transition to next state */
1537                 switch (cm_node->state) {
1538                         case NES_CM_STATE_LISTENING:
1539                         case NES_CM_STATE_SYN_RCVD:
1540                         case NES_CM_STATE_SYN_SENT:
1541                         case NES_CM_STATE_FIN_WAIT1:
1542                         case NES_CM_STATE_FIN_WAIT2:
1543                         case NES_CM_STATE_CLOSE_WAIT:
1544                         case NES_CM_STATE_LAST_ACK:
1545                         case NES_CM_STATE_CLOSING:
1546                                 break;
1547                         case  NES_CM_STATE_MPAREQ_SENT:
1548                                 /* recv the mpa res frame, ret=frame len (incl priv data) */
1549                                 ret = parse_mpa(cm_node, dataloc, datasize);
1550                                 if (ret < 0)
1551                                         break;
1552                                 /* set the req frame payload len in skb */
1553                                 /* we are done handling this state, set node to a TSA state */
1554                                 cm_node->state = NES_CM_STATE_TSA;
1555                                 send_ack(cm_node);
1556                                 create_event(cm_node, NES_CM_EVENT_CONNECTED);
1557                                 break;
1558
1559                         case  NES_CM_STATE_ESTABLISHED:
1560                                 /* we are expecting an MPA req frame */
1561                                 ret = parse_mpa(cm_node, dataloc, datasize);
1562                                 if (ret < 0) {
1563                                         break;
1564                                 }
1565                                 cm_node->state = NES_CM_STATE_TSA;
1566                                 send_ack(cm_node);
1567                                 /* we got a valid MPA request, create an event */
1568                                 create_event(cm_node, NES_CM_EVENT_MPA_REQ);
1569                                 break;
1570                         case  NES_CM_STATE_TSA:
1571                                 handle_exception_pkt(cm_node, skb);
1572                                 break;
1573                         case NES_CM_STATE_UNKNOWN:
1574                         case NES_CM_STATE_INITED:
1575                         default:
1576                                 ret = -1;
1577                 }
1578         }
1579
1580         return ret;
1581 }
1582
1583
1584 /**
1585  * mini_cm_listen - create a listen node with params
1586  */
1587 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1588                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1589 {
1590         struct nes_cm_listener *listener;
1591         unsigned long flags;
1592
1593         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1594                 cm_info->loc_addr, cm_info->loc_port);
1595
1596         /* cannot have multiple matching listeners */
1597         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1598                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1599         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1600                 /* find automatically incs ref count ??? */
1601                 atomic_dec(&listener->ref_count);
1602                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1603                 return NULL;
1604         }
1605
1606         if (!listener) {
1607                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1608                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1609                 if (!listener) {
1610                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1611                         return NULL;
1612                 }
1613
1614                 memset(listener, 0, sizeof(struct nes_cm_listener));
1615                 listener->loc_addr = htonl(cm_info->loc_addr);
1616                 listener->loc_port = htons(cm_info->loc_port);
1617                 listener->reused_node = 0;
1618
1619                 atomic_set(&listener->ref_count, 1);
1620         }
1621         /* pasive case */
1622         /* find already inc'ed the ref count */
1623         else {
1624                 listener->reused_node = 1;
1625         }
1626
1627         listener->cm_id = cm_info->cm_id;
1628         atomic_set(&listener->pend_accepts_cnt, 0);
1629         listener->cm_core = cm_core;
1630         listener->nesvnic = nesvnic;
1631         atomic_inc(&cm_core->node_cnt);
1632         atomic_inc(&cm_core->session_id);
1633
1634         listener->session_id = (u32)(atomic_read(&cm_core->session_id) + current->tgid);
1635         listener->conn_type = cm_info->conn_type;
1636         listener->backlog = cm_info->backlog;
1637         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1638
1639         if (!listener->reused_node) {
1640                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1641                 list_add(&listener->list, &cm_core->listen_list.list);
1642                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1643                 atomic_inc(&cm_core->listen_node_cnt);
1644         }
1645
1646         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
1647                         " listener = %p, backlog = %d, cm_id = %p.\n",
1648                         cm_info->loc_addr, cm_info->loc_port,
1649                         listener, listener->backlog, listener->cm_id);
1650
1651         return listener;
1652 }
1653
1654
1655 /**
1656  * mini_cm_connect - make a connection node with params
1657  */
1658 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1659                                            struct nes_vnic *nesvnic,
1660                                            struct ietf_mpa_frame *mpa_frame,
1661                                            struct nes_cm_info *cm_info)
1662 {
1663         int ret = 0;
1664         struct nes_cm_node *cm_node;
1665         struct nes_cm_listener *loopbackremotelistener;
1666         struct nes_cm_node *loopbackremotenode;
1667         struct nes_cm_info loopback_cm_info;
1668
1669         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) +
1670                         ntohs(mpa_frame->priv_data_len);
1671
1672         cm_info->loc_addr = htonl(cm_info->loc_addr);
1673         cm_info->rem_addr = htonl(cm_info->rem_addr);
1674         cm_info->loc_port = htons(cm_info->loc_port);
1675         cm_info->rem_port = htons(cm_info->rem_port);
1676
1677         /* create a CM connection node */
1678         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
1679         if (!cm_node)
1680                 return NULL;
1681
1682         // set our node side to client (active) side
1683         cm_node->tcp_cntxt.client = 1;
1684         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1685
1686         if (cm_info->loc_addr == cm_info->rem_addr) {
1687                 loopbackremotelistener = find_listener(cm_core, cm_node->rem_addr,
1688                                 cm_node->rem_port, NES_CM_LISTENER_ACTIVE_STATE);
1689                 if (loopbackremotelistener == NULL) {
1690                         create_event(cm_node, NES_CM_EVENT_ABORTED);
1691                 } else {
1692                         atomic_inc(&cm_loopbacks);
1693                         loopback_cm_info = *cm_info;
1694                         loopback_cm_info.loc_port = cm_info->rem_port;
1695                         loopback_cm_info.rem_port = cm_info->loc_port;
1696                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
1697                         loopbackremotenode = make_cm_node(cm_core, nesvnic, &loopback_cm_info,
1698                                         loopbackremotelistener);
1699                         loopbackremotenode->loopbackpartner = cm_node;
1700                         loopbackremotenode->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1701                         cm_node->loopbackpartner = loopbackremotenode;
1702                         memcpy(loopbackremotenode->mpa_frame_buf, &mpa_frame->priv_data,
1703                                         mpa_frame_size);
1704                         loopbackremotenode->mpa_frame_size = mpa_frame_size -
1705                                         sizeof(struct ietf_mpa_frame);
1706
1707                         // we are done handling this state, set node to a TSA state
1708                         cm_node->state = NES_CM_STATE_TSA;
1709                         cm_node->tcp_cntxt.rcv_nxt = loopbackremotenode->tcp_cntxt.loc_seq_num;
1710                         loopbackremotenode->tcp_cntxt.rcv_nxt = cm_node->tcp_cntxt.loc_seq_num;
1711                         cm_node->tcp_cntxt.max_snd_wnd = loopbackremotenode->tcp_cntxt.rcv_wnd;
1712                         loopbackremotenode->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
1713                         cm_node->tcp_cntxt.snd_wnd = loopbackremotenode->tcp_cntxt.rcv_wnd;
1714                         loopbackremotenode->tcp_cntxt.snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
1715                         cm_node->tcp_cntxt.snd_wscale = loopbackremotenode->tcp_cntxt.rcv_wscale;
1716                         loopbackremotenode->tcp_cntxt.snd_wscale = cm_node->tcp_cntxt.rcv_wscale;
1717
1718                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
1719                 }
1720                 return cm_node;
1721         }
1722
1723         /* set our node side to client (active) side */
1724         cm_node->tcp_cntxt.client = 1;
1725         /* init our MPA frame ptr */
1726         memcpy(&cm_node->mpa_frame, mpa_frame, mpa_frame_size);
1727         cm_node->mpa_frame_size = mpa_frame_size;
1728
1729         /* send a syn and goto syn sent state */
1730         cm_node->state = NES_CM_STATE_SYN_SENT;
1731         ret = send_syn(cm_node, 0);
1732
1733         nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X, port=0x%04x,"
1734                         " cm_node=%p, cm_id = %p.\n",
1735                         cm_node->rem_addr, cm_node->rem_port, cm_node, cm_node->cm_id);
1736
1737         return cm_node;
1738 }
1739
1740
1741 /**
1742  * mini_cm_accept - accept a connection
1743  * This function is never called
1744  */
1745 static int mini_cm_accept(struct nes_cm_core *cm_core, struct ietf_mpa_frame *mpa_frame,
1746                           struct nes_cm_node *cm_node)
1747 {
1748         return 0;
1749 }
1750
1751
1752 /**
1753  * mini_cm_reject - reject and teardown a connection
1754  */
1755 static int mini_cm_reject(struct nes_cm_core *cm_core,
1756                           struct ietf_mpa_frame *mpa_frame,
1757                           struct nes_cm_node *cm_node)
1758 {
1759         int ret = 0;
1760         struct sk_buff *skb;
1761         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) +
1762                         ntohs(mpa_frame->priv_data_len);
1763
1764         skb = get_free_pkt(cm_node);
1765         if (!skb) {
1766                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1767                 return -1;
1768         }
1769
1770         /* send an MPA Request frame */
1771         form_cm_frame(skb, cm_node, NULL, 0, mpa_frame, mpa_frame_size, SET_ACK | SET_FIN);
1772         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1773
1774         cm_node->state = NES_CM_STATE_CLOSED;
1775         ret = send_fin(cm_node, NULL);
1776
1777         if (ret < 0) {
1778                 printk(KERN_INFO PFX "failed to send MPA Reply (reject)\n");
1779                 return ret;
1780         }
1781
1782         return ret;
1783 }
1784
1785
1786 /**
1787  * mini_cm_close
1788  */
1789 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1790 {
1791         int ret = 0;
1792
1793         if (!cm_core || !cm_node)
1794                 return -EINVAL;
1795
1796         switch (cm_node->state) {
1797                 /* if passed in node is null, create a reference key node for node search */
1798                 /* check if we found an owner node for this pkt */
1799                 case NES_CM_STATE_SYN_RCVD:
1800                 case NES_CM_STATE_SYN_SENT:
1801                 case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
1802                 case NES_CM_STATE_ESTABLISHED:
1803                 case NES_CM_STATE_ACCEPTING:
1804                 case NES_CM_STATE_MPAREQ_SENT:
1805                         cm_node->state = NES_CM_STATE_FIN_WAIT1;
1806                         send_fin(cm_node, NULL);
1807                         break;
1808                 case NES_CM_STATE_CLOSE_WAIT:
1809                         cm_node->state = NES_CM_STATE_LAST_ACK;
1810                         send_fin(cm_node, NULL);
1811                         break;
1812                 case NES_CM_STATE_FIN_WAIT1:
1813                 case NES_CM_STATE_FIN_WAIT2:
1814                 case NES_CM_STATE_LAST_ACK:
1815                 case NES_CM_STATE_TIME_WAIT:
1816                 case NES_CM_STATE_CLOSING:
1817                         ret = -1;
1818                         break;
1819                 case NES_CM_STATE_LISTENING:
1820                 case NES_CM_STATE_UNKNOWN:
1821                 case NES_CM_STATE_INITED:
1822                 case NES_CM_STATE_CLOSED:
1823                 case NES_CM_STATE_TSA:
1824                         ret = rem_ref_cm_node(cm_core, cm_node);
1825                         break;
1826         }
1827         cm_node->cm_id = NULL;
1828         return ret;
1829 }
1830
1831
1832 /**
1833  * recv_pkt - recv an ETHERNET packet, and process it through CM
1834  * node state machine
1835  */
1836 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core, struct nes_vnic *nesvnic,
1837                             struct sk_buff *skb)
1838 {
1839         struct nes_cm_node *cm_node = NULL;
1840         struct nes_cm_listener *listener = NULL;
1841         struct iphdr *iph;
1842         struct tcphdr *tcph;
1843         struct nes_cm_info nfo;
1844         int ret = 0;
1845
1846         if (!skb || skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
1847                 ret = -EINVAL;
1848                 goto out;
1849         }
1850
1851         iph = (struct iphdr *)skb->data;
1852         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
1853         skb_reset_network_header(skb);
1854         skb_set_transport_header(skb, sizeof(*tcph));
1855         skb->len = ntohs(iph->tot_len);
1856
1857         nfo.loc_addr = ntohl(iph->daddr);
1858         nfo.loc_port = ntohs(tcph->dest);
1859         nfo.rem_addr = ntohl(iph->saddr);
1860         nfo.rem_port = ntohs(tcph->source);
1861
1862         nes_debug(NES_DBG_CM, "Received packet: dest=0x%08X:0x%04X src=0x%08X:0x%04X\n",
1863                         iph->daddr, tcph->dest, iph->saddr, tcph->source);
1864
1865         /* note: this call is going to increment cm_node ref count */
1866         cm_node = find_node(cm_core,
1867                         nfo.rem_port, nfo.rem_addr,
1868                         nfo.loc_port, nfo.loc_addr);
1869
1870         if (!cm_node) {
1871                 listener = find_listener(cm_core, nfo.loc_addr, nfo.loc_port,
1872                                 NES_CM_LISTENER_ACTIVE_STATE);
1873                 if (listener) {
1874                         nfo.cm_id = listener->cm_id;
1875                         nfo.conn_type = listener->conn_type;
1876                 } else {
1877                         nfo.cm_id = NULL;
1878                         nfo.conn_type = 0;
1879                 }
1880
1881                 cm_node = make_cm_node(cm_core, nesvnic, &nfo, listener);
1882                 if (!cm_node) {
1883                         nes_debug(NES_DBG_CM, "Unable to allocate node\n");
1884                         if (listener) {
1885                                 nes_debug(NES_DBG_CM, "unable to allocate node and decrementing listener refcount\n");
1886                                 atomic_dec(&listener->ref_count);
1887                         }
1888                         ret = -1;
1889                         goto out;
1890                 }
1891                 if (!listener) {
1892                         nes_debug(NES_DBG_CM, "Packet found for unknown port %x refcnt=%d\n",
1893                                         nfo.loc_port, atomic_read(&cm_node->ref_count));
1894                         if (!tcph->rst) {
1895                                 nes_debug(NES_DBG_CM, "Packet found for unknown port=%d"
1896                                                 " rem_port=%d refcnt=%d\n",
1897                                                 nfo.loc_port, nfo.rem_port, atomic_read(&cm_node->ref_count));
1898
1899                                 cm_node->tcp_cntxt.rcv_nxt = ntohl(tcph->seq);
1900                                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1901                                 send_reset(cm_node);
1902                         }
1903                         rem_ref_cm_node(cm_core, cm_node);
1904                         ret = -1;
1905                         goto out;
1906                 }
1907                 add_ref_cm_node(cm_node);
1908                 cm_node->state = NES_CM_STATE_LISTENING;
1909         }
1910
1911         nes_debug(NES_DBG_CM, "Processing Packet for node %p, data = (%p):\n",
1912                         cm_node, skb->data);
1913         process_packet(cm_node, skb, cm_core);
1914
1915         rem_ref_cm_node(cm_core, cm_node);
1916         out:
1917         if (skb)
1918                 dev_kfree_skb_any(skb);
1919         return ret;
1920 }
1921
1922
1923 /**
1924  * nes_cm_alloc_core - allocate a top level instance of a cm core
1925  */
1926 static struct nes_cm_core *nes_cm_alloc_core(void)
1927 {
1928         int i;
1929
1930         struct nes_cm_core *cm_core;
1931         struct sk_buff *skb = NULL;
1932
1933         /* setup the CM core */
1934         /* alloc top level core control structure */
1935         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
1936         if (!cm_core)
1937                 return NULL;
1938
1939         INIT_LIST_HEAD(&cm_core->connected_nodes);
1940         init_timer(&cm_core->tcp_timer);
1941         cm_core->tcp_timer.function = nes_cm_timer_tick;
1942
1943         cm_core->mtu   = NES_CM_DEFAULT_MTU;
1944         cm_core->state = NES_CM_STATE_INITED;
1945         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
1946
1947         atomic_set(&cm_core->session_id, 0);
1948         atomic_set(&cm_core->events_posted, 0);
1949
1950         /* init the packet lists */
1951         skb_queue_head_init(&cm_core->tx_free_list);
1952
1953         for (i = 0; i < NES_CM_DEFAULT_FRAME_CNT; i++) {
1954                 skb = dev_alloc_skb(cm_core->mtu);
1955                 if (!skb) {
1956                         kfree(cm_core);
1957                         return NULL;
1958                 }
1959                 /* add 'raw' skb to free frame list */
1960                 skb_queue_head(&cm_core->tx_free_list, skb);
1961         }
1962
1963         cm_core->api = &nes_cm_api;
1964
1965         spin_lock_init(&cm_core->ht_lock);
1966         spin_lock_init(&cm_core->listen_list_lock);
1967
1968         INIT_LIST_HEAD(&cm_core->listen_list.list);
1969
1970         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
1971
1972         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
1973         cm_core->event_wq = create_singlethread_workqueue("nesewq");
1974         cm_core->post_event = nes_cm_post_event;
1975         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
1976         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
1977
1978         print_core(cm_core);
1979         return cm_core;
1980 }
1981
1982
1983 /**
1984  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
1985  */
1986 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
1987 {
1988         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
1989
1990         if (!cm_core)
1991                 return -EINVAL;
1992
1993         barrier();
1994
1995         if (timer_pending(&cm_core->tcp_timer)) {
1996                 del_timer(&cm_core->tcp_timer);
1997         }
1998
1999         destroy_workqueue(cm_core->event_wq);
2000         destroy_workqueue(cm_core->disconn_wq);
2001         nes_debug(NES_DBG_CM, "\n");
2002         kfree(cm_core);
2003
2004         return 0;
2005 }
2006
2007
2008 /**
2009  * mini_cm_get
2010  */
2011 static int mini_cm_get(struct nes_cm_core *cm_core)
2012 {
2013         return cm_core->state;
2014 }
2015
2016
2017 /**
2018  * mini_cm_set
2019  */
2020 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2021 {
2022         int ret = 0;
2023
2024         switch (type) {
2025                 case NES_CM_SET_PKT_SIZE:
2026                         cm_core->mtu = value;
2027                         break;
2028                 case NES_CM_SET_FREE_PKT_Q_SIZE:
2029                         cm_core->free_tx_pkt_max = value;
2030                         break;
2031                 default:
2032                         /* unknown set option */
2033                         ret = -EINVAL;
2034         }
2035
2036         return ret;
2037 }
2038
2039
2040 /**
2041  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2042  * successfully exchanged when this is called
2043  */
2044 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2045 {
2046         int ret = 0;
2047
2048         if (!nesqp)
2049                 return -EINVAL;
2050
2051         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2052                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2053                         NES_QPCONTEXT_MISC_DROS);
2054
2055         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2056                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2057
2058         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2059
2060         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2061
2062         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2063                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2064
2065         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2066                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2067                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2068
2069         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2070                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2071                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2072
2073         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2074         nesqp->nesqp_context->ts_recent = 0;
2075         nesqp->nesqp_context->ts_age = 0;
2076         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2077         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2078         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2079         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2080                         cm_node->tcp_cntxt.rcv_wscale);
2081         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2082         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2083         nesqp->nesqp_context->srtt = 0;
2084         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2085         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2086         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2087         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2088         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2089         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2090
2091         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2092                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2093                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2094                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2095                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2096                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2097                         le32_to_cpu(nesqp->nesqp_context->misc));
2098         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2099         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2100         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2101
2102         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2103         cm_node->state = NES_CM_STATE_TSA;
2104
2105         return ret;
2106 }
2107
2108
2109 /**
2110  * nes_cm_disconn
2111  */
2112 int nes_cm_disconn(struct nes_qp *nesqp)
2113 {
2114         unsigned long flags;
2115
2116         spin_lock_irqsave(&nesqp->lock, flags);
2117         if (nesqp->disconn_pending == 0) {
2118                 nesqp->disconn_pending++;
2119                 spin_unlock_irqrestore(&nesqp->lock, flags);
2120                 /* nes_add_ref(&nesqp->ibqp); */
2121                 /* init our disconnect work element, to */
2122                 INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);
2123
2124                 queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
2125         } else {
2126                 spin_unlock_irqrestore(&nesqp->lock, flags);
2127                 nes_rem_ref(&nesqp->ibqp);
2128         }
2129
2130         return 0;
2131 }
2132
2133
2134 /**
2135  * nes_disconnect_worker
2136  */
2137 static void nes_disconnect_worker(struct work_struct *work)
2138 {
2139         struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);
2140
2141         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2142                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2143         nes_cm_disconn_true(nesqp);
2144 }
2145
2146
2147 /**
2148  * nes_cm_disconn_true
2149  */
2150 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2151 {
2152         unsigned long flags;
2153         int ret = 0;
2154         struct iw_cm_id *cm_id;
2155         struct iw_cm_event cm_event;
2156         struct nes_vnic *nesvnic;
2157         u16 last_ae;
2158         u8 original_hw_tcp_state;
2159         u8 original_ibqp_state;
2160         u8 issued_disconnect_reset = 0;
2161
2162         if (!nesqp) {
2163                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2164                 return -1;
2165         }
2166
2167         spin_lock_irqsave(&nesqp->lock, flags);
2168         cm_id = nesqp->cm_id;
2169         /* make sure we havent already closed this connection */
2170         if (!cm_id) {
2171                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2172                                 nesqp->hwqp.qp_id);
2173                 spin_unlock_irqrestore(&nesqp->lock, flags);
2174                 nes_rem_ref(&nesqp->ibqp);
2175                 return -1;
2176         }
2177
2178         nesvnic = to_nesvnic(nesqp->ibqp.device);
2179         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2180
2181         original_hw_tcp_state = nesqp->hw_tcp_state;
2182         original_ibqp_state   = nesqp->ibqp_state;
2183         last_ae = nesqp->last_aeq;
2184
2185
2186         nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);
2187
2188         if ((nesqp->cm_id) && (cm_id->event_handler)) {
2189                 if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2190                                 ((original_ibqp_state == IB_QPS_RTS) &&
2191                                 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2192                         atomic_inc(&cm_disconnects);
2193                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2194                         if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
2195                                 issued_disconnect_reset = 1;
2196                                 cm_event.status = IW_CM_EVENT_STATUS_RESET;
2197                                 nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event (status reset) for "
2198                                                 " QP%u, cm_id = %p. \n",
2199                                                 nesqp->hwqp.qp_id, cm_id);
2200                         } else {
2201                                 cm_event.status = IW_CM_EVENT_STATUS_OK;
2202                         }
2203
2204                         cm_event.local_addr = cm_id->local_addr;
2205                         cm_event.remote_addr = cm_id->remote_addr;
2206                         cm_event.private_data = NULL;
2207                         cm_event.private_data_len = 0;
2208
2209                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event for "
2210                                         " QP%u, SQ Head = %u, SQ Tail = %u. cm_id = %p, refcount = %u.\n",
2211                                         nesqp->hwqp.qp_id,
2212                                         nesqp->hwqp.sq_head, nesqp->hwqp.sq_tail, cm_id,
2213                                         atomic_read(&nesqp->refcount));
2214
2215                         spin_unlock_irqrestore(&nesqp->lock, flags);
2216                         ret = cm_id->event_handler(cm_id, &cm_event);
2217                         if (ret)
2218                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2219                         spin_lock_irqsave(&nesqp->lock, flags);
2220                 }
2221
2222                 nesqp->disconn_pending = 0;
2223                 /* There might have been another AE while the lock was released */
2224                 original_hw_tcp_state = nesqp->hw_tcp_state;
2225                 original_ibqp_state   = nesqp->ibqp_state;
2226                 last_ae = nesqp->last_aeq;
2227
2228                 if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
2229                                 ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2230                                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2231                                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2232                                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2233                         atomic_inc(&cm_closes);
2234                         nesqp->cm_id = NULL;
2235                         nesqp->in_disconnect = 0;
2236                         spin_unlock_irqrestore(&nesqp->lock, flags);
2237                         nes_disconnect(nesqp, 1);
2238
2239                         cm_id->provider_data = nesqp;
2240                         /* Send up the close complete event */
2241                         cm_event.event = IW_CM_EVENT_CLOSE;
2242                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2243                         cm_event.provider_data = cm_id->provider_data;
2244                         cm_event.local_addr = cm_id->local_addr;
2245                         cm_event.remote_addr = cm_id->remote_addr;
2246                         cm_event.private_data = NULL;
2247                         cm_event.private_data_len = 0;
2248
2249                         ret = cm_id->event_handler(cm_id, &cm_event);
2250                         if (ret) {
2251                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2252                         }
2253
2254                         cm_id->rem_ref(cm_id);
2255
2256                         spin_lock_irqsave(&nesqp->lock, flags);
2257                         if (nesqp->flush_issued == 0) {
2258                                 nesqp->flush_issued = 1;
2259                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2260                                 flush_wqes(nesvnic->nesdev, nesqp, NES_CQP_FLUSH_RQ, 1);
2261                         } else {
2262                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2263                         }
2264
2265                         /* This reference is from either ModifyQP or the AE processing,
2266                                         there is still a race here with modifyqp */
2267                         nes_rem_ref(&nesqp->ibqp);
2268
2269                 } else {
2270                         cm_id = nesqp->cm_id;
2271                         spin_unlock_irqrestore(&nesqp->lock, flags);
2272                         /* check to see if the inbound reset beat the outbound reset */
2273                         if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
2274                                 nes_debug(NES_DBG_CM, "QP%u: Decing refcount due to inbound reset"
2275                                                 " beating the outbound reset.\n",
2276                                                 nesqp->hwqp.qp_id);
2277                                 nes_rem_ref(&nesqp->ibqp);
2278                         }
2279                 }
2280         } else {
2281                 nesqp->disconn_pending = 0;
2282                 spin_unlock_irqrestore(&nesqp->lock, flags);
2283         }
2284         nes_rem_ref(&nesqp->ibqp);
2285
2286         return 0;
2287 }
2288
2289
2290 /**
2291  * nes_disconnect
2292  */
2293 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2294 {
2295         int ret = 0;
2296         struct nes_vnic *nesvnic;
2297         struct nes_device *nesdev;
2298
2299         nesvnic = to_nesvnic(nesqp->ibqp.device);
2300         if (!nesvnic)
2301                 return -EINVAL;
2302
2303         nesdev = nesvnic->nesdev;
2304
2305         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2306                         atomic_read(&nesvnic->netdev->refcnt));
2307
2308         if (nesqp->active_conn) {
2309
2310                 /* indicate this connection is NOT active */
2311                 nesqp->active_conn = 0;
2312         } else {
2313                 /* Need to free the Last Streaming Mode Message */
2314                 if (nesqp->ietf_frame) {
2315                         pci_free_consistent(nesdev->pcidev,
2316                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2317                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2318                 }
2319         }
2320
2321         /* close the CM node down if it is still active */
2322         if (nesqp->cm_node) {
2323                 nes_debug(NES_DBG_CM, "Call close API\n");
2324
2325                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2326                 nesqp->cm_node = NULL;
2327         }
2328
2329         return ret;
2330 }
2331
2332
2333 /**
2334  * nes_accept
2335  */
2336 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2337 {
2338         u64 u64temp;
2339         struct ib_qp *ibqp;
2340         struct nes_qp *nesqp;
2341         struct nes_vnic *nesvnic;
2342         struct nes_device *nesdev;
2343         struct nes_cm_node *cm_node;
2344         struct nes_adapter *adapter;
2345         struct ib_qp_attr attr;
2346         struct iw_cm_event cm_event;
2347         struct nes_hw_qp_wqe *wqe;
2348         struct nes_v4_quad nes_quad;
2349         u32 crc_value;
2350         int ret;
2351
2352         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2353         if (!ibqp)
2354                 return -EINVAL;
2355
2356         /* get all our handles */
2357         nesqp = to_nesqp(ibqp);
2358         nesvnic = to_nesvnic(nesqp->ibqp.device);
2359         nesdev = nesvnic->nesdev;
2360         adapter = nesdev->nesadapter;
2361
2362         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
2363                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
2364
2365         /* since this is from a listen, we were able to put node handle into cm_id */
2366         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2367
2368         /* associate the node with the QP */
2369         nesqp->cm_node = (void *)cm_node;
2370
2371         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu\n",
2372                         nesqp->hwqp.qp_id, cm_node, jiffies);
2373         atomic_inc(&cm_accepts);
2374
2375         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2376                         atomic_read(&nesvnic->netdev->refcnt));
2377
2378                 /* allocate the ietf frame and space for private data */
2379                 nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2380                                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2381                                 &nesqp->ietf_frame_pbase);
2382
2383                 if (!nesqp->ietf_frame) {
2384                         nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
2385                         return -ENOMEM;
2386                 }
2387
2388
2389                 /* setup the MPA frame */
2390                 nesqp->private_data_len = conn_param->private_data_len;
2391                 memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2392
2393                 memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2394                                 conn_param->private_data_len);
2395
2396                 nesqp->ietf_frame->priv_data_len = cpu_to_be16(conn_param->private_data_len);
2397                 nesqp->ietf_frame->rev = mpa_version;
2398                 nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2399
2400                 /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2401                 wqe = &nesqp->hwqp.sq_vbase[0];
2402
2403                 if (cm_id->remote_addr.sin_addr.s_addr != cm_id->local_addr.sin_addr.s_addr) {
2404                         u64temp = (unsigned long)nesqp;
2405                         u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2406                         set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2407                                             u64temp);
2408                         wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2409                                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING | NES_IWARP_SQ_WQE_WRPDU);
2410                         wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2411                                         cpu_to_le32(conn_param->private_data_len + sizeof(struct ietf_mpa_frame));
2412                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] =
2413                                         cpu_to_le32((u32)nesqp->ietf_frame_pbase);
2414                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] =
2415                                         cpu_to_le32((u32)((u64)nesqp->ietf_frame_pbase >> 32));
2416                         wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2417                                         cpu_to_le32(conn_param->private_data_len + sizeof(struct ietf_mpa_frame));
2418                         wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
2419
2420                         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2421                                         NES_QPCONTEXT_ORDIRD_LSMM_PRESENT | NES_QPCONTEXT_ORDIRD_WRPDU);
2422                 } else {
2423                         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2424                                         NES_QPCONTEXT_ORDIRD_WRPDU | NES_QPCONTEXT_ORDIRD_ALSMM));
2425                 }
2426                 nesqp->skip_lsmm = 1;
2427
2428
2429         /* Cache the cm_id in the qp */
2430         nesqp->cm_id = cm_id;
2431         cm_node->cm_id = cm_id;
2432
2433         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2434         cm_id->provider_data = nesqp;
2435         nesqp->active_conn   = 0;
2436
2437         nes_cm_init_tsa_conn(nesqp, cm_node);
2438
2439         nesqp->nesqp_context->tcpPorts[0] = cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2440         nesqp->nesqp_context->tcpPorts[1] = cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2441         nesqp->nesqp_context->ip0 = cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2442
2443         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2444                         (u32)PCI_FUNC(nesdev->pcidev->devfn) << NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2445
2446         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
2447                         nes_arp_table(nesdev, le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2448                         NES_ARP_RESOLVE) << 16);
2449
2450         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2451                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2452
2453         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2454
2455         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2456                         ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2457         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2458
2459         memset(&nes_quad, 0, sizeof(nes_quad));
2460         nes_quad.DstIpAdrIndex = cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2461         nes_quad.SrcIpadr      = cm_id->remote_addr.sin_addr.s_addr;
2462         nes_quad.TcpPorts[0]   = cm_id->remote_addr.sin_port;
2463         nes_quad.TcpPorts[1]   = cm_id->local_addr.sin_port;
2464
2465         /* Produce hash key */
2466         crc_value = get_crc_value(&nes_quad);
2467         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2468         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2469                         nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2470
2471         nesqp->hte_index &= adapter->hte_index_mask;
2472         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2473
2474         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2475
2476         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = 0x%08X:0x%04X,"
2477                         " rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + private data length=%zu.\n",
2478                         nesqp->hwqp.qp_id,
2479                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2480                         ntohs(cm_id->remote_addr.sin_port),
2481                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2482                         ntohs(cm_id->local_addr.sin_port),
2483                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2484                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2485                         conn_param->private_data_len+sizeof(struct ietf_mpa_frame));
2486
2487         attr.qp_state = IB_QPS_RTS;
2488         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2489
2490         /* notify OF layer that accept event was successfull */
2491         cm_id->add_ref(cm_id);
2492
2493         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2494         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2495         cm_event.provider_data = (void *)nesqp;
2496         cm_event.local_addr = cm_id->local_addr;
2497         cm_event.remote_addr = cm_id->remote_addr;
2498         cm_event.private_data = NULL;
2499         cm_event.private_data_len = 0;
2500         ret = cm_id->event_handler(cm_id, &cm_event);
2501         if (cm_node->loopbackpartner) {
2502                 cm_node->loopbackpartner->mpa_frame_size = nesqp->private_data_len;
2503                 /* copy entire MPA frame to our cm_node's frame */
2504                 memcpy(cm_node->loopbackpartner->mpa_frame_buf, nesqp->ietf_frame->priv_data,
2505                            nesqp->private_data_len);
2506                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2507         }
2508         if (ret)
2509                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
2510                                 __FUNCTION__, __LINE__, ret);
2511
2512         return 0;
2513 }
2514
2515
2516 /**
2517  * nes_reject
2518  */
2519 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2520 {
2521         struct nes_cm_node *cm_node;
2522         struct nes_cm_core *cm_core;
2523
2524         atomic_inc(&cm_rejects);
2525         cm_node = (struct nes_cm_node *) cm_id->provider_data;
2526         cm_core = cm_node->cm_core;
2527         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
2528
2529         strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
2530         memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
2531
2532         cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
2533         cm_node->mpa_frame.rev = mpa_version;
2534         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
2535
2536         cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
2537
2538         return 0;
2539 }
2540
2541
2542 /**
2543  * nes_connect
2544  * setup and launch cm connect node
2545  */
2546 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2547 {
2548         struct ib_qp *ibqp;
2549         struct nes_qp *nesqp;
2550         struct nes_vnic *nesvnic;
2551         struct nes_device *nesdev;
2552         struct nes_cm_node *cm_node;
2553         struct nes_cm_info cm_info;
2554
2555         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2556         if (!ibqp)
2557                 return -EINVAL;
2558         nesqp = to_nesqp(ibqp);
2559         if (!nesqp)
2560                 return -EINVAL;
2561         nesvnic = to_nesvnic(nesqp->ibqp.device);
2562         if (!nesvnic)
2563                 return -EINVAL;
2564         nesdev  = nesvnic->nesdev;
2565         if (!nesdev)
2566                 return -EINVAL;
2567
2568         atomic_inc(&cm_connects);
2569
2570         nesqp->ietf_frame = kzalloc(sizeof(struct ietf_mpa_frame) +
2571                         conn_param->private_data_len, GFP_KERNEL);
2572         if (!nesqp->ietf_frame)
2573                 return -ENOMEM;
2574
2575         /* set qp as having an active connection */
2576         nesqp->active_conn = 1;
2577
2578         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = 0x%08X:0x%04X.\n",
2579                         nesqp->hwqp.qp_id,
2580                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2581                         ntohs(cm_id->remote_addr.sin_port),
2582                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2583                         ntohs(cm_id->local_addr.sin_port));
2584
2585         /* cache the cm_id in the qp */
2586         nesqp->cm_id = cm_id;
2587
2588         cm_id->provider_data = nesqp;
2589
2590         /* copy the private data */
2591         if (conn_param->private_data_len) {
2592                 memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2593                                 conn_param->private_data_len);
2594         }
2595
2596         nesqp->private_data_len = conn_param->private_data_len;
2597         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2598         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
2599         nes_debug(NES_DBG_CM, "mpa private data len =%u\n", conn_param->private_data_len);
2600
2601         strcpy(&nesqp->ietf_frame->key[0], IEFT_MPA_KEY_REQ);
2602         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2603         nesqp->ietf_frame->rev = IETF_MPA_VERSION;
2604         nesqp->ietf_frame->priv_data_len = htons(conn_param->private_data_len);
2605
2606         if (cm_id->local_addr.sin_addr.s_addr != cm_id->remote_addr.sin_addr.s_addr)
2607                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2608                                 PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2609
2610         /* set up the connection params for the node */
2611         cm_info.loc_addr = (cm_id->local_addr.sin_addr.s_addr);
2612         cm_info.loc_port = (cm_id->local_addr.sin_port);
2613         cm_info.rem_addr = (cm_id->remote_addr.sin_addr.s_addr);
2614         cm_info.rem_port = (cm_id->remote_addr.sin_port);
2615         cm_info.cm_id = cm_id;
2616         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2617
2618         cm_id->add_ref(cm_id);
2619         nes_add_ref(&nesqp->ibqp);
2620
2621         /* create a connect CM node connection */
2622         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic, nesqp->ietf_frame, &cm_info);
2623         if (!cm_node) {
2624                 if (cm_id->local_addr.sin_addr.s_addr != cm_id->remote_addr.sin_addr.s_addr)
2625                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2626                                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
2627                 nes_rem_ref(&nesqp->ibqp);
2628                 kfree(nesqp->ietf_frame);
2629                 nesqp->ietf_frame = NULL;
2630                 cm_id->rem_ref(cm_id);
2631                 return -ENOMEM;
2632         }
2633
2634         cm_node->apbvt_set = 1;
2635         nesqp->cm_node = cm_node;
2636
2637         return 0;
2638 }
2639
2640
2641 /**
2642  * nes_create_listen
2643  */
2644 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
2645 {
2646         struct nes_vnic *nesvnic;
2647         struct nes_cm_listener *cm_node;
2648         struct nes_cm_info cm_info;
2649         struct nes_adapter *adapter;
2650         int err;
2651
2652
2653         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
2654                         cm_id, ntohs(cm_id->local_addr.sin_port));
2655
2656         nesvnic = to_nesvnic(cm_id->device);
2657         if (!nesvnic)
2658                 return -EINVAL;
2659         adapter = nesvnic->nesdev->nesadapter;
2660         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
2661                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
2662
2663         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
2664                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
2665
2666         /* setup listen params in our api call struct */
2667         cm_info.loc_addr = nesvnic->local_ipaddr;
2668         cm_info.loc_port = cm_id->local_addr.sin_port;
2669         cm_info.backlog = backlog;
2670         cm_info.cm_id = cm_id;
2671
2672         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2673
2674
2675         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
2676         if (!cm_node) {
2677                 printk("%s[%u] Error returned from listen API call\n",
2678                                 __FUNCTION__, __LINE__);
2679                 return -ENOMEM;
2680         }
2681
2682         cm_id->provider_data = cm_node;
2683
2684         if (!cm_node->reused_node) {
2685                 err = nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2686                                 PCI_FUNC(nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2687                 if (err) {
2688                         printk("nes_manage_apbvt call returned %d.\n", err);
2689                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
2690                         return err;
2691                 }
2692                 cm_listens_created++;
2693         }
2694
2695         cm_id->add_ref(cm_id);
2696         cm_id->provider_data = (void *)cm_node;
2697
2698
2699         return 0;
2700 }
2701
2702
2703 /**
2704  * nes_destroy_listen
2705  */
2706 int nes_destroy_listen(struct iw_cm_id *cm_id)
2707 {
2708         if (cm_id->provider_data)
2709                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
2710         else
2711                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
2712
2713         cm_id->rem_ref(cm_id);
2714
2715         return 0;
2716 }
2717
2718
2719 /**
2720  * nes_cm_recv
2721  */
2722 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
2723 {
2724         cm_packets_received++;
2725         if ((g_cm_core) && (g_cm_core->api)) {
2726                 g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
2727         } else {
2728                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
2729                                 " cm is not setup properly.\n");
2730         }
2731
2732         return 0;
2733 }
2734
2735
2736 /**
2737  * nes_cm_start
2738  * Start and init a cm core module
2739  */
2740 int nes_cm_start(void)
2741 {
2742         nes_debug(NES_DBG_CM, "\n");
2743         /* create the primary CM core, pass this handle to subsequent core inits */
2744         g_cm_core = nes_cm_alloc_core();
2745         if (g_cm_core) {
2746                 return 0;
2747         } else {
2748                 return -ENOMEM;
2749         }
2750 }
2751
2752
2753 /**
2754  * nes_cm_stop
2755  * stop and dealloc all cm core instances
2756  */
2757 int nes_cm_stop(void)
2758 {
2759         g_cm_core->api->destroy_cm_core(g_cm_core);
2760         return 0;
2761 }
2762
2763
2764 /**
2765  * cm_event_connected
2766  * handle a connected event, setup QPs and HW
2767  */
2768 static void cm_event_connected(struct nes_cm_event *event)
2769 {
2770         u64 u64temp;
2771         struct nes_qp *nesqp;
2772         struct nes_vnic *nesvnic;
2773         struct nes_device *nesdev;
2774         struct nes_cm_node *cm_node;
2775         struct nes_adapter *nesadapter;
2776         struct ib_qp_attr attr;
2777         struct iw_cm_id *cm_id;
2778         struct iw_cm_event cm_event;
2779         struct nes_hw_qp_wqe *wqe;
2780         struct nes_v4_quad nes_quad;
2781         u32 crc_value;
2782         int ret;
2783
2784         /* get all our handles */
2785         cm_node = event->cm_node;
2786         cm_id = cm_node->cm_id;
2787         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
2788         nesqp = (struct nes_qp *)cm_id->provider_data;
2789         nesvnic = to_nesvnic(nesqp->ibqp.device);
2790         nesdev = nesvnic->nesdev;
2791         nesadapter = nesdev->nesadapter;
2792
2793         if (nesqp->destroyed) {
2794                 return;
2795         }
2796         atomic_inc(&cm_connecteds);
2797         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
2798                         " local port 0x%04X. jiffies = %lu.\n",
2799                         nesqp->hwqp.qp_id,
2800                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2801                         ntohs(cm_id->remote_addr.sin_port),
2802                         ntohs(cm_id->local_addr.sin_port),
2803                         jiffies);
2804
2805         nes_cm_init_tsa_conn(nesqp, cm_node);
2806
2807         /* set the QP tsa context */
2808         nesqp->nesqp_context->tcpPorts[0] = cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2809         nesqp->nesqp_context->tcpPorts[1] = cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2810         nesqp->nesqp_context->ip0 = cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2811
2812         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2813                         (u32)PCI_FUNC(nesdev->pcidev->devfn) << NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2814         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
2815                         nes_arp_table(nesdev, le32_to_cpu(nesqp->nesqp_context->ip0),
2816                         NULL, NES_ARP_RESOLVE) << 16);
2817         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2818                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2819         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2820         nesqp->nesqp_context->ird_ord_sizes |=
2821                         cpu_to_le32((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
2822
2823         /* Adjust tail for not having a LSMM */
2824         nesqp->hwqp.sq_tail = 1;
2825
2826 #if defined(NES_SEND_FIRST_WRITE)
2827                 if (cm_node->send_write0) {
2828                         nes_debug(NES_DBG_CM, "Sending first write.\n");
2829                         wqe = &nesqp->hwqp.sq_vbase[0];
2830                         u64temp = (unsigned long)nesqp;
2831                         u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2832                         set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2833                                             u64temp);
2834                         wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] = cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
2835                         wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
2836                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
2837                         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
2838                         wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
2839                         wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
2840
2841                         /* use the reserved spot on the WQ for the extra first WQE */
2842                         nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2843                                         NES_QPCONTEXT_ORDIRD_WRPDU | NES_QPCONTEXT_ORDIRD_ALSMM));
2844                         nesqp->skip_lsmm = 1;
2845                         nesqp->hwqp.sq_tail = 0;
2846                         nes_write32(nesdev->regs + NES_WQE_ALLOC,
2847                                         (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
2848                 }
2849 #endif
2850
2851         memset(&nes_quad, 0, sizeof(nes_quad));
2852
2853         nes_quad.DstIpAdrIndex = cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2854         nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2855         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2856         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2857
2858         /* Produce hash key */
2859         crc_value = get_crc_value(&nes_quad);
2860         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2861         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
2862                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
2863
2864         nesqp->hte_index &= nesadapter->hte_index_mask;
2865         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2866
2867         nesqp->ietf_frame = &cm_node->mpa_frame;
2868         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
2869         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2870
2871         /* modify QP state to rts */
2872         attr.qp_state = IB_QPS_RTS;
2873         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2874
2875         /* notify OF layer we successfully created the requested connection */
2876         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
2877         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2878         cm_event.provider_data = cm_id->provider_data;
2879         cm_event.local_addr.sin_family = AF_INET;
2880         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
2881         cm_event.remote_addr = cm_id->remote_addr;
2882
2883                 cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
2884                 cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
2885
2886         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
2887         ret = cm_id->event_handler(cm_id, &cm_event);
2888         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2889
2890         if (ret)
2891                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
2892                                 __FUNCTION__, __LINE__, ret);
2893         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = %lu\n",
2894                         nesqp->hwqp.qp_id, jiffies );
2895
2896         nes_rem_ref(&nesqp->ibqp);
2897
2898         return;
2899 }
2900
2901
2902 /**
2903  * cm_event_connect_error
2904  */
2905 static void cm_event_connect_error(struct nes_cm_event *event)
2906 {
2907         struct nes_qp *nesqp;
2908         struct iw_cm_id *cm_id;
2909         struct iw_cm_event cm_event;
2910         /* struct nes_cm_info cm_info; */
2911         int ret;
2912
2913         if (!event->cm_node)
2914                 return;
2915
2916         cm_id = event->cm_node->cm_id;
2917         if (!cm_id) {
2918                 return;
2919         }
2920
2921         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
2922         nesqp = cm_id->provider_data;
2923
2924         if (!nesqp) {
2925                 return;
2926         }
2927
2928         /* notify OF layer about this connection error event */
2929         /* cm_id->rem_ref(cm_id); */
2930         nesqp->cm_id = NULL;
2931         cm_id->provider_data = NULL;
2932         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
2933         cm_event.status = IW_CM_EVENT_STATUS_REJECTED;
2934         cm_event.provider_data = cm_id->provider_data;
2935         cm_event.local_addr = cm_id->local_addr;
2936         cm_event.remote_addr = cm_id->remote_addr;
2937         cm_event.private_data = NULL;
2938         cm_event.private_data_len = 0;
2939
2940         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, remove_addr=%08x\n",
2941                         cm_event.local_addr.sin_addr.s_addr, cm_event.remote_addr.sin_addr.s_addr);
2942
2943         ret = cm_id->event_handler(cm_id, &cm_event);
2944         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2945         if (ret)
2946                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
2947                                 __FUNCTION__, __LINE__, ret);
2948         nes_rem_ref(&nesqp->ibqp);
2949                 cm_id->rem_ref(cm_id);
2950
2951         return;
2952 }
2953
2954
2955 /**
2956  * cm_event_reset
2957  */
2958 static void cm_event_reset(struct nes_cm_event *event)
2959 {
2960         struct nes_qp *nesqp;
2961         struct iw_cm_id *cm_id;
2962         struct iw_cm_event cm_event;
2963         /* struct nes_cm_info cm_info; */
2964         int ret;
2965
2966         if (!event->cm_node)
2967                 return;
2968
2969         if (!event->cm_node->cm_id)
2970                 return;
2971
2972         cm_id = event->cm_node->cm_id;
2973
2974         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
2975         nesqp = cm_id->provider_data;
2976
2977         nesqp->cm_id = NULL;
2978         /* cm_id->provider_data = NULL; */
2979         cm_event.event = IW_CM_EVENT_DISCONNECT;
2980         cm_event.status = IW_CM_EVENT_STATUS_RESET;
2981         cm_event.provider_data = cm_id->provider_data;
2982         cm_event.local_addr = cm_id->local_addr;
2983         cm_event.remote_addr = cm_id->remote_addr;
2984         cm_event.private_data = NULL;
2985         cm_event.private_data_len = 0;
2986
2987         ret = cm_id->event_handler(cm_id, &cm_event);
2988         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2989
2990
2991         /* notify OF layer about this connection error event */
2992         cm_id->rem_ref(cm_id);
2993
2994         return;
2995 }
2996
2997
2998 /**
2999  * cm_event_mpa_req
3000  */
3001 static void cm_event_mpa_req(struct nes_cm_event *event)
3002 {
3003         struct iw_cm_id   *cm_id;
3004         struct iw_cm_event cm_event;
3005         int ret;
3006         struct nes_cm_node *cm_node;
3007
3008         cm_node = event->cm_node;
3009         if (!cm_node)
3010                 return;
3011         cm_id = cm_node->cm_id;
3012
3013         atomic_inc(&cm_connect_reqs);
3014         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3015                         cm_node, cm_id, jiffies);
3016
3017         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3018         cm_event.status = IW_CM_EVENT_STATUS_OK;
3019         cm_event.provider_data = (void *)cm_node;
3020
3021         cm_event.local_addr.sin_family = AF_INET;
3022         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3023         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3024
3025         cm_event.remote_addr.sin_family = AF_INET;
3026         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3027         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3028
3029                 cm_event.private_data                = cm_node->mpa_frame_buf;
3030                 cm_event.private_data_len            = (u8) cm_node->mpa_frame_size;
3031
3032         ret = cm_id->event_handler(cm_id, &cm_event);
3033         if (ret)
3034                 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
3035                                 __FUNCTION__, __LINE__, ret);
3036
3037         return;
3038 }
3039
3040
3041 static void nes_cm_event_handler(struct work_struct *);
3042
3043 /**
3044  * nes_cm_post_event
3045  * post an event to the cm event handler
3046  */
3047 static int nes_cm_post_event(struct nes_cm_event *event)
3048 {
3049         atomic_inc(&event->cm_node->cm_core->events_posted);
3050         add_ref_cm_node(event->cm_node);
3051         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3052         INIT_WORK(&event->event_work, nes_cm_event_handler);
3053         nes_debug(NES_DBG_CM, "queue_work, event=%p\n", event);
3054
3055         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3056
3057         nes_debug(NES_DBG_CM, "Exit\n");
3058         return 0;
3059 }
3060
3061
3062 /**
3063  * nes_cm_event_handler
3064  * worker function to handle cm events
3065  * will free instance of nes_cm_event
3066  */
3067 static void nes_cm_event_handler(struct work_struct *work)
3068 {
3069         struct nes_cm_event *event = container_of(work, struct nes_cm_event, event_work);
3070         struct nes_cm_core *cm_core;
3071
3072         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core)) {
3073                 return;
3074         }
3075         cm_core = event->cm_node->cm_core;
3076         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3077                         event, event->type, atomic_read(&cm_core->events_posted));
3078
3079         switch (event->type) {
3080                 case NES_CM_EVENT_MPA_REQ:
3081                         cm_event_mpa_req(event);
3082                         nes_debug(NES_DBG_CM, "CM Event: MPA REQUEST\n");
3083                         break;
3084                 case NES_CM_EVENT_RESET:
3085                         nes_debug(NES_DBG_CM, "CM Event: RESET\n");
3086                         cm_event_reset(event);
3087                         break;
3088                 case NES_CM_EVENT_CONNECTED:
3089                         if ((!event->cm_node->cm_id) ||
3090                                 (event->cm_node->state != NES_CM_STATE_TSA)) {
3091                                 break;
3092                         }
3093                         cm_event_connected(event);
3094                         nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3095                         break;
3096                 case NES_CM_EVENT_ABORTED:
3097                         if ((!event->cm_node->cm_id) || (event->cm_node->state == NES_CM_STATE_TSA)) {
3098                                 break;
3099                         }
3100                         cm_event_connect_error(event);
3101                         nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3102                         break;
3103                 case NES_CM_EVENT_DROPPED_PKT:
3104                         nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3105                         break;
3106                 default:
3107                         nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3108                         break;
3109         }
3110
3111         atomic_dec(&cm_core->events_posted);
3112         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3113         rem_ref_cm_node(cm_core, event->cm_node);
3114         kfree(event);
3115
3116         return;
3117 }