drivers/infiniband/hw/nes/nes_cm.c

   1 /*
   2  * Copyright (c) 2006 - 2009 Intel-NE, Inc.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34
  35 #define TCPOPT_TIMESTAMP 8
  36
  37 #include <asm/atomic.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/ip.h>
  40 #include <linux/tcp.h>
  41 #include <linux/init.h>
  42 #include <linux/if_arp.h>
  43 #include <linux/if_vlan.h>
  44 #include <linux/notifier.h>
  45 #include <linux/net.h>
  46 #include <linux/types.h>
  47 #include <linux/timer.h>
  48 #include <linux/time.h>
  49 #include <linux/delay.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/random.h>
  53 #include <linux/list.h>
  54 #include <linux/threads.h>
  55 #include <net/arp.h>
  56 #include <net/neighbour.h>
  57 #include <net/route.h>
  58 #include <net/ip_fib.h>
  59
  60 #include "nes.h"
  61
  62 u32 cm_packets_sent;
  63 u32 cm_packets_bounced;
  64 u32 cm_packets_dropped;
  65 u32 cm_packets_retrans;
  66 u32 cm_packets_created;
  67 u32 cm_packets_received;
  68 u32 cm_listens_created;
  69 u32 cm_listens_destroyed;
  70 u32 cm_backlog_drops;
  71 atomic_t cm_loopbacks;
  72 atomic_t cm_nodes_created;
  73 atomic_t cm_nodes_destroyed;
  74 atomic_t cm_accel_dropped_pkts;
  75 atomic_t cm_resets_recvd;
  76
  77 static inline int mini_cm_accelerated(struct nes_cm_core *,
  78         struct nes_cm_node *);
  79 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
  80         struct nes_vnic *, struct nes_cm_info *);
  81 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
  82 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *,
  83         struct nes_vnic *, u16, void *, struct nes_cm_info *);
  84 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
  85 static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
  86         struct nes_cm_node *);
  87 static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
  88         struct nes_cm_node *);
  89 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *,
  90         struct sk_buff *);
  91 static int mini_cm_dealloc_core(struct nes_cm_core *);
  92 static int mini_cm_get(struct nes_cm_core *);
  93 static int mini_cm_set(struct nes_cm_core *, u32, u32);
  94
  95 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *,
  96         void *, u32, void *, u32, u8);
  97 static int add_ref_cm_node(struct nes_cm_node *);
  98 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
  99
 100 static int nes_cm_disconn_true(struct nes_qp *);
 101 static int nes_cm_post_event(struct nes_cm_event *event);
 102 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
 103 static void nes_disconnect_worker(struct work_struct *work);
 104
 105 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
 106 static int send_mpa_reject(struct nes_cm_node *);
 107 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
 108 static int send_reset(struct nes_cm_node *, struct sk_buff *);
 109 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
 110 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
 111 static void process_packet(struct nes_cm_node *, struct sk_buff *,
 112         struct nes_cm_core *);
 113
 114 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
 115 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
 116 static void cleanup_retrans_entry(struct nes_cm_node *);
 117 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
 118 static void free_retrans_entry(struct nes_cm_node *cm_node);
 119 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
 120         struct sk_buff *skb, int optionsize, int passive);
 121
 122 /* CM event handler functions */
 123 static void cm_event_connected(struct nes_cm_event *);
 124 static void cm_event_connect_error(struct nes_cm_event *);
 125 static void cm_event_reset(struct nes_cm_event *);
 126 static void cm_event_mpa_req(struct nes_cm_event *);
 127 static void cm_event_mpa_reject(struct nes_cm_event *);
 128 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
 129
 130 static void print_core(struct nes_cm_core *core);
 131
 132 /* External CM API Interface */
 133 /* instance of function pointers for client API */
 134 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
 135 static struct nes_cm_ops nes_cm_api = {
 136         mini_cm_accelerated,
 137         mini_cm_listen,
 138         mini_cm_del_listen,
 139         mini_cm_connect,
 140         mini_cm_close,
 141         mini_cm_accept,
 142         mini_cm_reject,
 143         mini_cm_recv_pkt,
 144         mini_cm_dealloc_core,
 145         mini_cm_get,
 146         mini_cm_set
 147 };
 148
 149 static struct nes_cm_core *g_cm_core;
 150
 151 atomic_t cm_connects;
 152 atomic_t cm_accepts;
 153 atomic_t cm_disconnects;
 154 atomic_t cm_closes;
 155 atomic_t cm_connecteds;
 156 atomic_t cm_connect_reqs;
 157 atomic_t cm_rejects;
 158
 159
 160 /**
 161  * create_event
 162  */
 163 static struct nes_cm_event *create_event(struct nes_cm_node *cm_node,
 164                 enum nes_cm_event_type type)
 165 {
 166         struct nes_cm_event *event;
 167
 168         if (!cm_node->cm_id)
 169                 return NULL;
 170
 171         /* allocate an empty event */
 172         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 173
 174         if (!event)
 175                 return NULL;
 176
 177         event->type = type;
 178         event->cm_node = cm_node;
 179         event->cm_info.rem_addr = cm_node->rem_addr;
 180         event->cm_info.loc_addr = cm_node->loc_addr;
 181         event->cm_info.rem_port = cm_node->rem_port;
 182         event->cm_info.loc_port = cm_node->loc_port;
 183         event->cm_info.cm_id = cm_node->cm_id;
 184
 185         nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
 186                 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
 187                 cm_node, event, type, event->cm_info.loc_addr,
 188                 event->cm_info.loc_port, event->cm_info.rem_addr,
 189                 event->cm_info.rem_port);
 190
 191         nes_cm_post_event(event);
 192         return event;
 193 }
 194
 195
 196 /**
 197  * send_mpa_request
 198  */
 199 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
 200 {
 201         if (!skb) {
 202                 nes_debug(NES_DBG_CM, "skb set to NULL\n");
 203                 return -1;
 204         }
 205
 206         /* send an MPA Request frame */
 207         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 208                         cm_node->mpa_frame_size, SET_ACK);
 209
 210         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 211 }
 212
 213
 214
 215 static int send_mpa_reject(struct nes_cm_node *cm_node)
 216 {
 217         struct sk_buff  *skb = NULL;
 218
 219         skb = dev_alloc_skb(MAX_CM_BUFFER);
 220         if (!skb) {
 221                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 222                 return -ENOMEM;
 223         }
 224
 225         /* send an MPA reject frame */
 226         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 227                         cm_node->mpa_frame_size, SET_ACK | SET_FIN);
 228
 229         cm_node->state = NES_CM_STATE_FIN_WAIT1;
 230         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 231 }
 232
 233
 234 /**
 235  * recv_mpa - process a received TCP pkt, we are expecting an
 236  * IETF MPA frame
 237  */
 238 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
 239                 u32 len)
 240 {
 241         struct ietf_mpa_frame *mpa_frame;
 242
 243         *type = NES_MPA_REQUEST_ACCEPT;
 244
 245         /* assume req frame is in tcp data payload */
 246         if (len < sizeof(struct ietf_mpa_frame)) {
 247                 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
 248                 return -EINVAL;
 249         }
 250
 251         mpa_frame = (struct ietf_mpa_frame *)buffer;
 252         cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
 253
 254         if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
 255                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
 256                                 " complete (%x + %x != %x)\n",
 257                                 cm_node->mpa_frame_size,
 258                                 (u32)sizeof(struct ietf_mpa_frame), len);
 259                 return -EINVAL;
 260         }
 261         /* make sure it does not exceed the max size */
 262         if (len > MAX_CM_BUFFER) {
 263                 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
 264                                 " (%x + %x != %x)\n",
 265                                 cm_node->mpa_frame_size,
 266                                 (u32)sizeof(struct ietf_mpa_frame), len);
 267                 return -EINVAL;
 268         }
 269
 270         /* copy entire MPA frame to our cm_node's frame */
 271         memcpy(cm_node->mpa_frame_buf, buffer + sizeof(struct ietf_mpa_frame),
 272                         cm_node->mpa_frame_size);
 273
 274         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
 275                 *type = NES_MPA_REQUEST_REJECT;
 276         return 0;
 277 }
 278
 279
 280 /**
 281  * form_cm_frame - get a free packet and build empty frame Use
 282  * node info to build.
 283  */
 284 static void form_cm_frame(struct sk_buff *skb,
 285         struct nes_cm_node *cm_node, void *options, u32 optionsize,
 286         void *data, u32 datasize, u8 flags)
 287 {
 288         struct tcphdr *tcph;
 289         struct iphdr *iph;
 290         struct ethhdr *ethh;
 291         u8 *buf;
 292         u16 packetsize = sizeof(*iph);
 293
 294         packetsize += sizeof(*tcph);
 295         packetsize +=  optionsize + datasize;
 296
 297         memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
 298
 299         skb->len = 0;
 300         buf = skb_put(skb, packetsize + ETH_HLEN);
 301
 302         ethh = (struct ethhdr *) buf;
 303         buf += ETH_HLEN;
 304
 305         iph = (struct iphdr *)buf;
 306         buf += sizeof(*iph);
 307         tcph = (struct tcphdr *)buf;
 308         skb_reset_mac_header(skb);
 309         skb_set_network_header(skb, ETH_HLEN);
 310         skb_set_transport_header(skb, ETH_HLEN+sizeof(*iph));
 311         buf += sizeof(*tcph);
 312
 313         skb->ip_summed = CHECKSUM_PARTIAL;
 314         skb->protocol = htons(0x800);
 315         skb->data_len = 0;
 316         skb->mac_len = ETH_HLEN;
 317
 318         memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
 319         memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
 320         ethh->h_proto = htons(0x0800);
 321
 322         iph->version = IPVERSION;
 323         iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
 324         iph->tos = 0;
 325         iph->tot_len = htons(packetsize);
 326         iph->id = htons(++cm_node->tcp_cntxt.loc_id);
 327
 328         iph->frag_off = htons(0x4000);
 329         iph->ttl = 0x40;
 330         iph->protocol = 0x06;   /* IPPROTO_TCP */
 331
 332         iph->saddr = htonl(cm_node->loc_addr);
 333         iph->daddr = htonl(cm_node->rem_addr);
 334
 335         tcph->source = htons(cm_node->loc_port);
 336         tcph->dest = htons(cm_node->rem_port);
 337         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
 338
 339         if (flags & SET_ACK) {
 340                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
 341                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
 342                 tcph->ack = 1;
 343         } else
 344                 tcph->ack_seq = 0;
 345
 346         if (flags & SET_SYN) {
 347                 cm_node->tcp_cntxt.loc_seq_num++;
 348                 tcph->syn = 1;
 349         } else
 350                 cm_node->tcp_cntxt.loc_seq_num += datasize;
 351
 352         if (flags & SET_FIN) {
 353                 cm_node->tcp_cntxt.loc_seq_num++;
 354                 tcph->fin = 1;
 355         }
 356
 357         if (flags & SET_RST)
 358                 tcph->rst = 1;
 359
 360         tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
 361         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
 362         tcph->urg_ptr = 0;
 363         if (optionsize)
 364                 memcpy(buf, options, optionsize);
 365         buf += optionsize;
 366         if (datasize)
 367                 memcpy(buf, data, datasize);
 368
 369         skb_shinfo(skb)->nr_frags = 0;
 370         cm_packets_created++;
 371
 372 }
 373
 374
 375 /**
 376  * print_core - dump a cm core
 377  */
 378 static void print_core(struct nes_cm_core *core)
 379 {
 380         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 381         nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
 382         if (!core)
 383                 return;
 384         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 385
 386         nes_debug(NES_DBG_CM, "State         : %u \n",  core->state);
 387
 388         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
 389         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
 390
 391         nes_debug(NES_DBG_CM, "core          : %p \n", core);
 392
 393         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
 394 }
 395
 396
 397 /**
 398  * schedule_nes_timer
 399  * note - cm_node needs to be protected before calling this. Encase in:
 400  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 401  */
 402 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
 403                 enum nes_timer_type type, int send_retrans,
 404                 int close_when_complete)
 405 {
 406         unsigned long  flags;
 407         struct nes_cm_core *cm_core = cm_node->cm_core;
 408         struct nes_timer_entry *new_send;
 409         int ret = 0;
 410         u32 was_timer_set;
 411
 412         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
 413         if (!new_send)
 414                 return -ENOMEM;
 415
 416         /* new_send->timetosend = currenttime */
 417         new_send->retrycount = NES_DEFAULT_RETRYS;
 418         new_send->retranscount = NES_DEFAULT_RETRANS;
 419         new_send->skb = skb;
 420         new_send->timetosend = jiffies;
 421         new_send->type = type;
 422         new_send->netdev = cm_node->netdev;
 423         new_send->send_retrans = send_retrans;
 424         new_send->close_when_complete = close_when_complete;
 425
 426         if (type == NES_TIMER_TYPE_CLOSE) {
 427                 new_send->timetosend += (HZ/10);
 428                 if (cm_node->recv_entry) {
 429                         kfree(new_send);
 430                         WARN_ON(1);
 431                         return -EINVAL;
 432                 }
 433                 cm_node->recv_entry = new_send;
 434         }
 435
 436         if (type == NES_TIMER_TYPE_SEND) {
 437                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 438                 atomic_inc(&new_send->skb->users);
 439                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 440                 cm_node->send_entry = new_send;
 441                 add_ref_cm_node(cm_node);
 442                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 443                 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
 444
 445                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
 446                 if (ret != NETDEV_TX_OK) {
 447                         nes_debug(NES_DBG_CM, "Error sending packet %p "
 448                                 "(jiffies = %lu)\n", new_send, jiffies);
 449                         new_send->timetosend = jiffies;
 450                         ret = NETDEV_TX_OK;
 451                 } else {
 452                         cm_packets_sent++;
 453                         if (!send_retrans) {
 454                                 cleanup_retrans_entry(cm_node);
 455                                 if (close_when_complete)
 456                                         rem_ref_cm_node(cm_core, cm_node);
 457                                 return ret;
 458                         }
 459                 }
 460         }
 461
 462         was_timer_set = timer_pending(&cm_core->tcp_timer);
 463
 464         if (!was_timer_set) {
 465                 cm_core->tcp_timer.expires = new_send->timetosend;
 466                 add_timer(&cm_core->tcp_timer);
 467         }
 468
 469         return ret;
 470 }
 471
 472 static void nes_retrans_expired(struct nes_cm_node *cm_node)
 473 {
 474         switch (cm_node->state) {
 475         case NES_CM_STATE_SYN_RCVD:
 476         case NES_CM_STATE_CLOSING:
 477                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 478                 break;
 479         case NES_CM_STATE_LAST_ACK:
 480         case NES_CM_STATE_FIN_WAIT1:
 481         case NES_CM_STATE_MPAREJ_RCVD:
 482                 send_reset(cm_node, NULL);
 483                 break;
 484         default:
 485                 create_event(cm_node, NES_CM_EVENT_ABORTED);
 486         }
 487 }
 488
 489 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
 490 {
 491         struct nes_timer_entry *recv_entry = cm_node->recv_entry;
 492         struct iw_cm_id *cm_id = cm_node->cm_id;
 493         struct nes_qp *nesqp;
 494         unsigned long qplockflags;
 495
 496         if (!recv_entry)
 497                 return;
 498         nesqp = (struct nes_qp *)recv_entry->skb;
 499         if (nesqp) {
 500                 spin_lock_irqsave(&nesqp->lock, qplockflags);
 501                 if (nesqp->cm_id) {
 502                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 503                                 "refcount = %d: HIT A "
 504                                 "NES_TIMER_TYPE_CLOSE with something "
 505                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 506                                 atomic_read(&nesqp->refcount));
 507                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
 508                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
 509                         nesqp->ibqp_state = IB_QPS_ERR;
 510                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 511                         nes_cm_disconn(nesqp);
 512                 } else {
 513                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 514                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 515                                 "refcount = %d: HIT A "
 516                                 "NES_TIMER_TYPE_CLOSE with nothing "
 517                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 518                                 atomic_read(&nesqp->refcount));
 519                 }
 520         } else if (rem_node) {
 521                 /* TIME_WAIT state */
 522                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 523         }
 524         if (cm_node->cm_id)
 525                 cm_id->rem_ref(cm_id);
 526         kfree(recv_entry);
 527         cm_node->recv_entry = NULL;
 528 }
 529
 530 /**
 531  * nes_cm_timer_tick
 532  */
 533 static void nes_cm_timer_tick(unsigned long pass)
 534 {
 535         unsigned long flags;
 536         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
 537         struct nes_cm_node *cm_node;
 538         struct nes_timer_entry *send_entry, *recv_entry;
 539         struct list_head *list_core_temp;
 540         struct list_head *list_node;
 541         struct nes_cm_core *cm_core = g_cm_core;
 542         u32 settimer = 0;
 543         int ret = NETDEV_TX_OK;
 544
 545         struct list_head timer_list;
 546         INIT_LIST_HEAD(&timer_list);
 547         spin_lock_irqsave(&cm_core->ht_lock, flags);
 548
 549         list_for_each_safe(list_node, list_core_temp,
 550                                 &cm_core->connected_nodes) {
 551                 cm_node = container_of(list_node, struct nes_cm_node, list);
 552                 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
 553                         add_ref_cm_node(cm_node);
 554                         list_add(&cm_node->timer_entry, &timer_list);
 555                 }
 556         }
 557         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 558
 559         list_for_each_safe(list_node, list_core_temp, &timer_list) {
 560                 cm_node = container_of(list_node, struct nes_cm_node,
 561                                         timer_entry);
 562                 recv_entry = cm_node->recv_entry;
 563
 564                 if (recv_entry) {
 565                         if (time_after(recv_entry->timetosend, jiffies)) {
 566                                 if (nexttimeout > recv_entry->timetosend ||
 567                                                 !settimer) {
 568                                         nexttimeout = recv_entry->timetosend;
 569                                         settimer = 1;
 570                                 }
 571                         } else
 572                                 handle_recv_entry(cm_node, 1);
 573                 }
 574
 575                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 576                 do {
 577                         send_entry = cm_node->send_entry;
 578                         if (!send_entry)
 579                                 break;
 580                         if (time_after(send_entry->timetosend, jiffies)) {
 581                                 if (cm_node->state != NES_CM_STATE_TSA) {
 582                                         if ((nexttimeout >
 583                                                 send_entry->timetosend) ||
 584                                                 !settimer) {
 585                                                 nexttimeout =
 586                                                         send_entry->timetosend;
 587                                                 settimer = 1;
 588                                         }
 589                                 } else {
 590                                         free_retrans_entry(cm_node);
 591                                 }
 592                                 break;
 593                         }
 594
 595                         if ((cm_node->state == NES_CM_STATE_TSA) ||
 596                                 (cm_node->state == NES_CM_STATE_CLOSED)) {
 597                                 free_retrans_entry(cm_node);
 598                                 break;
 599                         }
 600
 601                         if (!send_entry->retranscount ||
 602                                 !send_entry->retrycount) {
 603                                 cm_packets_dropped++;
 604                                 free_retrans_entry(cm_node);
 605
 606                                 spin_unlock_irqrestore(
 607                                         &cm_node->retrans_list_lock, flags);
 608                                 nes_retrans_expired(cm_node);
 609                                 cm_node->state = NES_CM_STATE_CLOSED;
 610                                 spin_lock_irqsave(&cm_node->retrans_list_lock,
 611                                         flags);
 612                                 break;
 613                         }
 614                         atomic_inc(&send_entry->skb->users);
 615                         cm_packets_retrans++;
 616                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
 617                                 "for node %p, jiffies = %lu, time to send = "
 618                                 "%lu, retranscount = %u, send_entry->seq_num = "
 619                                 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
 620                                 "0x%08X\n", send_entry, cm_node, jiffies,
 621                                 send_entry->timetosend,
 622                                 send_entry->retranscount,
 623                                 send_entry->seq_num,
 624                                 cm_node->tcp_cntxt.rem_ack_num);
 625
 626                         spin_unlock_irqrestore(&cm_node->retrans_list_lock,
 627                                 flags);
 628                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
 629                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 630                         if (ret != NETDEV_TX_OK) {
 631                                 nes_debug(NES_DBG_CM, "rexmit failed for "
 632                                         "node=%p\n", cm_node);
 633                                 cm_packets_bounced++;
 634                                 send_entry->retrycount--;
 635                                 nexttimeout = jiffies + NES_SHORT_TIME;
 636                                 settimer = 1;
 637                                 break;
 638                         } else {
 639                                 cm_packets_sent++;
 640                         }
 641                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
 642                                 "%u, retry count = %u.\n",
 643                                 send_entry->retranscount,
 644                                 send_entry->retrycount);
 645                         if (send_entry->send_retrans) {
 646                                 send_entry->retranscount--;
 647                                 send_entry->timetosend = jiffies +
 648                                         NES_RETRY_TIMEOUT;
 649                                 if (nexttimeout > send_entry->timetosend ||
 650                                         !settimer) {
 651                                         nexttimeout = send_entry->timetosend;
 652                                         settimer = 1;
 653                                 }
 654                         } else {
 655                                 int close_when_complete;
 656                                 close_when_complete =
 657                                         send_entry->close_when_complete;
 658                                 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
 659                                         cm_node, cm_node->state);
 660                                 free_retrans_entry(cm_node);
 661                                 if (close_when_complete)
 662                                         rem_ref_cm_node(cm_node->cm_core,
 663                                                 cm_node);
 664                         }
 665                 } while (0);
 666
 667                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 668                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 669         }
 670
 671         if (settimer) {
 672                 if (!timer_pending(&cm_core->tcp_timer)) {
 673                         cm_core->tcp_timer.expires  = nexttimeout;
 674                         add_timer(&cm_core->tcp_timer);
 675                 }
 676         }
 677 }
 678
 679
 680 /**
 681  * send_syn
 682  */
 683 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
 684         struct sk_buff *skb)
 685 {
 686         int ret;
 687         int flags = SET_SYN;
 688         char optionsbuffer[sizeof(struct option_mss) +
 689                 sizeof(struct option_windowscale) + sizeof(struct option_base) +
 690                 TCP_OPTIONS_PADDING];
 691
 692         int optionssize = 0;
 693         /* Sending MSS option */
 694         union all_known_options *options;
 695
 696         if (!cm_node)
 697                 return -EINVAL;
 698
 699         options = (union all_known_options *)&optionsbuffer[optionssize];
 700         options->as_mss.optionnum = OPTION_NUMBER_MSS;
 701         options->as_mss.length = sizeof(struct option_mss);
 702         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
 703         optionssize += sizeof(struct option_mss);
 704
 705         options = (union all_known_options *)&optionsbuffer[optionssize];
 706         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
 707         options->as_windowscale.length = sizeof(struct option_windowscale);
 708         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
 709         optionssize += sizeof(struct option_windowscale);
 710
 711         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
 712                 options = (union all_known_options *)&optionsbuffer[optionssize];
 713                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
 714                 options->as_base.length = sizeof(struct option_base);
 715                 optionssize += sizeof(struct option_base);
 716                 /* we need the size to be a multiple of 4 */
 717                 options = (union all_known_options *)&optionsbuffer[optionssize];
 718                 options->as_end = 1;
 719                 optionssize += 1;
 720                 options = (union all_known_options *)&optionsbuffer[optionssize];
 721                 options->as_end = 1;
 722                 optionssize += 1;
 723         }
 724
 725         options = (union all_known_options *)&optionsbuffer[optionssize];
 726         options->as_end = OPTION_NUMBER_END;
 727         optionssize += 1;
 728
 729         if (!skb)
 730                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 731         if (!skb) {
 732                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 733                 return -1;
 734         }
 735
 736         if (sendack)
 737                 flags |= SET_ACK;
 738
 739         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
 740         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 741
 742         return ret;
 743 }
 744
 745
 746 /**
 747  * send_reset
 748  */
 749 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
 750 {
 751         int ret;
 752         int flags = SET_RST | SET_ACK;
 753
 754         if (!skb)
 755                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 756         if (!skb) {
 757                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 758                 return -ENOMEM;
 759         }
 760
 761         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
 762         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
 763
 764         return ret;
 765 }
 766
 767
 768 /**
 769  * send_ack
 770  */
 771 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
 772 {
 773         int ret;
 774
 775         if (!skb)
 776                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 777
 778         if (!skb) {
 779                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 780                 return -1;
 781         }
 782
 783         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
 784         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
 785
 786         return ret;
 787 }
 788
 789
 790 /**
 791  * send_fin
 792  */
 793 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
 794 {
 795         int ret;
 796
 797         /* if we didn't get a frame get one */
 798         if (!skb)
 799                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 800
 801         if (!skb) {
 802                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 803                 return -1;
 804         }
 805
 806         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
 807         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 808
 809         return ret;
 810 }
 811
 812
 813 /**
 814  * find_node - find a cm node that matches the reference cm node
 815  */
 816 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
 817                 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
 818 {
 819         unsigned long flags;
 820         struct list_head *hte;
 821         struct nes_cm_node *cm_node;
 822
 823         /* get a handle on the hte */
 824         hte = &cm_core->connected_nodes;
 825
 826         /* walk list and find cm_node associated with this session ID */
 827         spin_lock_irqsave(&cm_core->ht_lock, flags);
 828         list_for_each_entry(cm_node, hte, list) {
 829                 /* compare quad, return node handle if a match */
 830                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
 831                                 cm_node->loc_addr, cm_node->loc_port,
 832                                 loc_addr, loc_port,
 833                                 cm_node->rem_addr, cm_node->rem_port,
 834                                 rem_addr, rem_port);
 835                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
 836                                 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
 837                         add_ref_cm_node(cm_node);
 838                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 839                         return cm_node;
 840                 }
 841         }
 842         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 843
 844         /* no owner node */
 845         return NULL;
 846 }
 847
 848
 849 /**
 850  * find_listener - find a cm node listening on this addr-port pair
 851  */
 852 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
 853                 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
 854 {
 855         unsigned long flags;
 856         struct nes_cm_listener *listen_node;
 857
 858         /* walk list and find cm_node associated with this session ID */
 859         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 860         list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
 861                 /* compare node pair, return node handle if a match */
 862                 if (((listen_node->loc_addr == dst_addr) ||
 863                                 listen_node->loc_addr == 0x00000000) &&
 864                                 (listen_node->loc_port == dst_port) &&
 865                                 (listener_state & listen_node->listener_state)) {
 866                         atomic_inc(&listen_node->ref_count);
 867                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 868                         return listen_node;
 869                 }
 870         }
 871         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 872
 873         /* no listener */
 874         return NULL;
 875 }
 876
 877
 878 /**
 879  * add_hte_node - add a cm node to the hash table
 880  */
 881 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
 882 {
 883         unsigned long flags;
 884         struct list_head *hte;
 885
 886         if (!cm_node || !cm_core)
 887                 return -EINVAL;
 888
 889         nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
 890                 cm_node);
 891
 892         spin_lock_irqsave(&cm_core->ht_lock, flags);
 893
 894         /* get a handle on the hash table element (list head for this slot) */
 895         hte = &cm_core->connected_nodes;
 896         list_add_tail(&cm_node->list, hte);
 897         atomic_inc(&cm_core->ht_node_cnt);
 898
 899         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 900
 901         return 0;
 902 }
 903
 904
 905 /**
 906  * mini_cm_dec_refcnt_listen
 907  */
 908 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
 909         struct nes_cm_listener *listener, int free_hanging_nodes)
 910 {
 911         int ret = -EINVAL;
 912         int err = 0;
 913         unsigned long flags;
 914         struct list_head *list_pos = NULL;
 915         struct list_head *list_temp = NULL;
 916         struct nes_cm_node *cm_node = NULL;
 917         struct list_head reset_list;
 918
 919         nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
 920                 "refcnt=%d\n", listener, free_hanging_nodes,
 921                 atomic_read(&listener->ref_count));
 922         /* free non-accelerated child nodes for this listener */
 923         INIT_LIST_HEAD(&reset_list);
 924         if (free_hanging_nodes) {
 925                 spin_lock_irqsave(&cm_core->ht_lock, flags);
 926                 list_for_each_safe(list_pos, list_temp,
 927                                    &g_cm_core->connected_nodes) {
 928                         cm_node = container_of(list_pos, struct nes_cm_node,
 929                                 list);
 930                         if ((cm_node->listener == listener) &&
 931                             (!cm_node->accelerated)) {
 932                                 add_ref_cm_node(cm_node);
 933                                 list_add(&cm_node->reset_entry, &reset_list);
 934                         }
 935                 }
 936                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 937         }
 938
 939         list_for_each_safe(list_pos, list_temp, &reset_list) {
 940                 cm_node = container_of(list_pos, struct nes_cm_node,
 941                                 reset_entry);
 942                 {
 943                         struct nes_cm_node *loopback = cm_node->loopbackpartner;
 944                         if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
 945                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 946                         } else {
 947                                 if (!loopback) {
 948                                         cleanup_retrans_entry(cm_node);
 949                                         err = send_reset(cm_node, NULL);
 950                                         if (err) {
 951                                                 cm_node->state =
 952                                                          NES_CM_STATE_CLOSED;
 953                                                 WARN_ON(1);
 954                                         } else {
 955                                                 cm_node->state =
 956                                                         NES_CM_STATE_CLOSED;
 957                                                 rem_ref_cm_node(
 958                                                         cm_node->cm_core,
 959                                                         cm_node);
 960                                         }
 961                                 } else {
 962                                         struct nes_cm_event event;
 963
 964                                         event.cm_node = loopback;
 965                                         event.cm_info.rem_addr =
 966                                                         loopback->rem_addr;
 967                                         event.cm_info.loc_addr =
 968                                                         loopback->loc_addr;
 969                                         event.cm_info.rem_port =
 970                                                         loopback->rem_port;
 971                                         event.cm_info.loc_port =
 972                                                          loopback->loc_port;
 973                                         event.cm_info.cm_id = loopback->cm_id;
 974                                         cm_event_connect_error(&event);
 975                                         loopback->state = NES_CM_STATE_CLOSED;
 976
 977                                         event.cm_node = cm_node;
 978                                         event.cm_info.rem_addr =
 979                                                          cm_node->rem_addr;
 980                                         event.cm_info.loc_addr =
 981                                                          cm_node->loc_addr;
 982                                         event.cm_info.rem_port =
 983                                                          cm_node->rem_port;
 984                                         event.cm_info.loc_port =
 985                                                          cm_node->loc_port;
 986                                         event.cm_info.cm_id = cm_node->cm_id;
 987                                         cm_event_reset(&event);
 988
 989                                         rem_ref_cm_node(cm_node->cm_core,
 990                                                          cm_node);
 991
 992                                 }
 993                         }
 994                 }
 995         }
 996
 997         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 998         if (!atomic_dec_return(&listener->ref_count)) {
 999                 list_del(&listener->list);
1000
1001                 /* decrement our listen node count */
1002                 atomic_dec(&cm_core->listen_node_cnt);
1003
1004                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1005
1006                 if (listener->nesvnic) {
1007                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
1008                                         PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
1009                 }
1010
1011                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1012
1013                 kfree(listener);
1014                 listener = NULL;
1015                 ret = 0;
1016                 cm_listens_destroyed++;
1017         } else {
1018                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1019         }
1020         if (listener) {
1021                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1022                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
1023                                         " with non-zero pending accepts=%u\n",
1024                                         listener, atomic_read(&listener->pend_accepts_cnt));
1025         }
1026
1027         return ret;
1028 }
1029
1030
1031 /**
1032  * mini_cm_del_listen
1033  */
1034 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1035                 struct nes_cm_listener *listener)
1036 {
1037         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1038         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1039         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1040 }
1041
1042
1043 /**
1044  * mini_cm_accelerated
1045  */
1046 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1047                 struct nes_cm_node *cm_node)
1048 {
1049         u32 was_timer_set;
1050         cm_node->accelerated = 1;
1051
1052         if (cm_node->accept_pend) {
1053                 BUG_ON(!cm_node->listener);
1054                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1055                 cm_node->accept_pend = 0;
1056                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1057         }
1058
1059         was_timer_set = timer_pending(&cm_core->tcp_timer);
1060         if (!was_timer_set) {
1061                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1062                 add_timer(&cm_core->tcp_timer);
1063         }
1064
1065         return 0;
1066 }
1067
1068
1069 /**
1070  * nes_addr_resolve_neigh
1071  */
1072 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
1073 {
1074         struct rtable *rt;
1075         struct flowi fl;
1076         struct neighbour *neigh;
1077         int rc = -1;
1078
1079         memset(&fl, 0, sizeof fl);
1080         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1081         if (ip_route_output_key(&init_net, &rt, &fl)) {
1082                 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1083                                 __func__, dst_ip);
1084                 return rc;
1085         }
1086
1087         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, nesvnic->netdev);
1088         if (neigh) {
1089                 if (neigh->nud_state & NUD_VALID) {
1090                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1091                                   " is %pM, Gateway is 0x%08X \n", dst_ip,
1092                                   neigh->ha, ntohl(rt->rt_gateway));
1093                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1094                                              dst_ip, NES_ARP_ADD);
1095                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1096                                            NES_ARP_RESOLVE);
1097                 }
1098                 neigh_release(neigh);
1099         }
1100
1101         if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
1102                 neigh_event_send(rt->u.dst.neighbour, NULL);
1103
1104         ip_rt_put(rt);
1105         return rc;
1106 }
1107
1108
1109 /**
1110  * make_cm_node - create a new instance of a cm node
1111  */
1112 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1113                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1114                 struct nes_cm_listener *listener)
1115 {
1116         struct nes_cm_node *cm_node;
1117         struct timespec ts;
1118         int arpindex = 0;
1119         struct nes_device *nesdev;
1120         struct nes_adapter *nesadapter;
1121
1122         /* create an hte and cm_node for this instance */
1123         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1124         if (!cm_node)
1125                 return NULL;
1126
1127         /* set our node specific transport info */
1128         cm_node->loc_addr = cm_info->loc_addr;
1129         cm_node->rem_addr = cm_info->rem_addr;
1130         cm_node->loc_port = cm_info->loc_port;
1131         cm_node->rem_port = cm_info->rem_port;
1132         cm_node->send_write0 = send_first;
1133         nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1134                   &cm_node->loc_addr, cm_node->loc_port,
1135                   &cm_node->rem_addr, cm_node->rem_port);
1136         cm_node->listener = listener;
1137         cm_node->netdev = nesvnic->netdev;
1138         cm_node->cm_id = cm_info->cm_id;
1139         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1140
1141         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1142                         cm_node->cm_id);
1143
1144         spin_lock_init(&cm_node->retrans_list_lock);
1145
1146         cm_node->loopbackpartner = NULL;
1147         atomic_set(&cm_node->ref_count, 1);
1148         /* associate our parent CM core */
1149         cm_node->cm_core = cm_core;
1150         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1151         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1152         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1153                         NES_CM_DEFAULT_RCV_WND_SCALE;
1154         ts = current_kernel_time();
1155         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1156         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1157                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1158         cm_node->tcp_cntxt.rcv_nxt = 0;
1159         /* get a unique session ID , add thread_id to an upcounter to handle race */
1160         atomic_inc(&cm_core->node_cnt);
1161         cm_node->conn_type = cm_info->conn_type;
1162         cm_node->apbvt_set = 0;
1163         cm_node->accept_pend = 0;
1164
1165         cm_node->nesvnic = nesvnic;
1166         /* get some device handles, for arp lookup */
1167         nesdev = nesvnic->nesdev;
1168         nesadapter = nesdev->nesadapter;
1169
1170         cm_node->loopbackpartner = NULL;
1171         /* get the mac addr for the remote node */
1172         if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
1173                 arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1174         else
1175                 arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1176         if (arpindex < 0) {
1177                 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr);
1178                 if (arpindex < 0) {
1179                         kfree(cm_node);
1180                         return NULL;
1181                 }
1182         }
1183
1184         /* copy the mac addr to node context */
1185         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1186         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1187                   cm_node->rem_mac);
1188
1189         add_hte_node(cm_core, cm_node);
1190         atomic_inc(&cm_nodes_created);
1191
1192         return cm_node;
1193 }
1194
1195
1196 /**
1197  * add_ref_cm_node - destroy an instance of a cm node
1198  */
1199 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1200 {
1201         atomic_inc(&cm_node->ref_count);
1202         return 0;
1203 }
1204
1205
1206 /**
1207  * rem_ref_cm_node - destroy an instance of a cm node
1208  */
1209 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1210         struct nes_cm_node *cm_node)
1211 {
1212         unsigned long flags;
1213         struct nes_qp *nesqp;
1214
1215         if (!cm_node)
1216                 return -EINVAL;
1217
1218         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1219         if (atomic_dec_return(&cm_node->ref_count)) {
1220                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1221                 return 0;
1222         }
1223         list_del(&cm_node->list);
1224         atomic_dec(&cm_core->ht_node_cnt);
1225         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1226
1227         /* if the node is destroyed before connection was accelerated */
1228         if (!cm_node->accelerated && cm_node->accept_pend) {
1229                 BUG_ON(!cm_node->listener);
1230                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1231                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1232         }
1233         WARN_ON(cm_node->send_entry);
1234         if (cm_node->recv_entry)
1235                 handle_recv_entry(cm_node, 0);
1236         if (cm_node->listener) {
1237                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1238         } else {
1239                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1240                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1241                                 PCI_FUNC(
1242                                 cm_node->nesvnic->nesdev->pcidev->devfn),
1243                                 NES_MANAGE_APBVT_DEL);
1244                 }
1245         }
1246
1247         atomic_dec(&cm_core->node_cnt);
1248         atomic_inc(&cm_nodes_destroyed);
1249         nesqp = cm_node->nesqp;
1250         if (nesqp) {
1251                 nesqp->cm_node = NULL;
1252                 nes_rem_ref(&nesqp->ibqp);
1253                 cm_node->nesqp = NULL;
1254         }
1255
1256         kfree(cm_node);
1257         return 0;
1258 }
1259
1260 /**
1261  * process_options
1262  */
1263 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1264         u32 optionsize, u32 syn_packet)
1265 {
1266         u32 tmp;
1267         u32 offset = 0;
1268         union all_known_options *all_options;
1269         char got_mss_option = 0;
1270
1271         while (offset < optionsize) {
1272                 all_options = (union all_known_options *)(optionsloc + offset);
1273                 switch (all_options->as_base.optionnum) {
1274                 case OPTION_NUMBER_END:
1275                         offset = optionsize;
1276                         break;
1277                 case OPTION_NUMBER_NONE:
1278                         offset += 1;
1279                         continue;
1280                 case OPTION_NUMBER_MSS:
1281                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1282                                 "Size: %d\n", __func__,
1283                                 all_options->as_mss.length, offset, optionsize);
1284                         got_mss_option = 1;
1285                         if (all_options->as_mss.length != 4) {
1286                                 return 1;
1287                         } else {
1288                                 tmp = ntohs(all_options->as_mss.mss);
1289                                 if (tmp > 0 && tmp <
1290                                         cm_node->tcp_cntxt.mss)
1291                                         cm_node->tcp_cntxt.mss = tmp;
1292                         }
1293                         break;
1294                 case OPTION_NUMBER_WINDOW_SCALE:
1295                         cm_node->tcp_cntxt.snd_wscale =
1296                                 all_options->as_windowscale.shiftcount;
1297                         break;
1298                 case OPTION_NUMBER_WRITE0:
1299                         cm_node->send_write0 = 1;
1300                         break;
1301                 default:
1302                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1303                                 all_options->as_base.optionnum);
1304                         break;
1305                 }
1306                 offset += all_options->as_base.length;
1307         }
1308         if ((!got_mss_option) && (syn_packet))
1309                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1310         return 0;
1311 }
1312
1313 static void drop_packet(struct sk_buff *skb)
1314 {
1315         atomic_inc(&cm_accel_dropped_pkts);
1316         dev_kfree_skb_any(skb);
1317 }
1318
1319 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1320 {
1321         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1322                 "refcnt=%d\n", cm_node, cm_node->state,
1323                 atomic_read(&cm_node->ref_count));
1324         cm_node->tcp_cntxt.rcv_nxt++;
1325         cleanup_retrans_entry(cm_node);
1326         switch (cm_node->state) {
1327         case NES_CM_STATE_SYN_RCVD:
1328         case NES_CM_STATE_SYN_SENT:
1329         case NES_CM_STATE_ESTABLISHED:
1330         case NES_CM_STATE_MPAREQ_SENT:
1331         case NES_CM_STATE_MPAREJ_RCVD:
1332                 cm_node->state = NES_CM_STATE_LAST_ACK;
1333                 send_fin(cm_node, NULL);
1334                 break;
1335         case NES_CM_STATE_FIN_WAIT1:
1336                 cm_node->state = NES_CM_STATE_CLOSING;
1337                 send_ack(cm_node, NULL);
1338                 /* Wait for ACK as this is simultanous close..
1339                 * After we receive ACK, do not send anything..
1340                 * Just rm the node.. Done.. */
1341                 break;
1342         case NES_CM_STATE_FIN_WAIT2:
1343                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1344                 send_ack(cm_node, NULL);
1345                 schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
1346                 break;
1347         case NES_CM_STATE_TIME_WAIT:
1348                 cm_node->state = NES_CM_STATE_CLOSED;
1349                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1350                 break;
1351         case NES_CM_STATE_TSA:
1352         default:
1353                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1354                         cm_node, cm_node->state);
1355                 break;
1356         }
1357 }
1358
1359
1360 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1361         struct tcphdr *tcph)
1362 {
1363
1364         int     reset = 0;      /* whether to send reset in case of err.. */
1365         int     passive_state;
1366         atomic_inc(&cm_resets_recvd);
1367         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1368                         " refcnt=%d\n", cm_node, cm_node->state,
1369                         atomic_read(&cm_node->ref_count));
1370         cleanup_retrans_entry(cm_node);
1371         switch (cm_node->state) {
1372         case NES_CM_STATE_SYN_SENT:
1373         case NES_CM_STATE_MPAREQ_SENT:
1374                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1375                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1376                         cm_node->listener, cm_node->state);
1377                 active_open_err(cm_node, skb, reset);
1378                 break;
1379         case NES_CM_STATE_MPAREQ_RCVD:
1380                 passive_state = atomic_add_return(1, &cm_node->passive_state);
1381                 if (passive_state ==  NES_SEND_RESET_EVENT)
1382                         create_event(cm_node, NES_CM_EVENT_RESET);
1383                 cleanup_retrans_entry(cm_node);
1384                 cm_node->state = NES_CM_STATE_CLOSED;
1385                 dev_kfree_skb_any(skb);
1386                 break;
1387         case NES_CM_STATE_ESTABLISHED:
1388         case NES_CM_STATE_SYN_RCVD:
1389         case NES_CM_STATE_LISTENING:
1390                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1391                 passive_open_err(cm_node, skb, reset);
1392                 break;
1393         case NES_CM_STATE_TSA:
1394                 active_open_err(cm_node, skb, reset);
1395                 break;
1396         case NES_CM_STATE_CLOSED:
1397                 cleanup_retrans_entry(cm_node);
1398                 drop_packet(skb);
1399                 break;
1400         case NES_CM_STATE_TIME_WAIT:
1401                 cleanup_retrans_entry(cm_node);
1402                 cm_node->state = NES_CM_STATE_CLOSED;
1403                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1404                 drop_packet(skb);
1405                 break;
1406         case NES_CM_STATE_FIN_WAIT1:
1407                 cleanup_retrans_entry(cm_node);
1408                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1409         default:
1410                 drop_packet(skb);
1411                 break;
1412         }
1413 }
1414
1415
1416 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1417 {
1418
1419         int     ret = 0;
1420         int datasize = skb->len;
1421         u8 *dataloc = skb->data;
1422
1423         enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1424         u32     res_type;
1425         ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1426         if (ret) {
1427                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1428                 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1429                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1430                                 "cm_node=%p listener=%p state=%d\n", __func__,
1431                                 __LINE__, cm_node, cm_node->listener,
1432                                 cm_node->state);
1433                         active_open_err(cm_node, skb, 1);
1434                 } else {
1435                         passive_open_err(cm_node, skb, 1);
1436                 }
1437                 return;
1438         }
1439
1440         switch (cm_node->state) {
1441         case NES_CM_STATE_ESTABLISHED:
1442                 if (res_type == NES_MPA_REQUEST_REJECT) {
1443                         /*BIG problem as we are receiving the MPA.. So should
1444                         * not be REJECT.. This is Passive Open.. We can
1445                         * only receive it Reject for Active Open...*/
1446                         WARN_ON(1);
1447                 }
1448                 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1449                 type = NES_CM_EVENT_MPA_REQ;
1450                 atomic_set(&cm_node->passive_state,
1451                                 NES_PASSIVE_STATE_INDICATED);
1452                 break;
1453         case NES_CM_STATE_MPAREQ_SENT:
1454                 if (res_type == NES_MPA_REQUEST_REJECT) {
1455                         type = NES_CM_EVENT_MPA_REJECT;
1456                         cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1457                 } else {
1458                         type = NES_CM_EVENT_CONNECTED;
1459                         cm_node->state = NES_CM_STATE_TSA;
1460                 }
1461
1462                 break;
1463         default:
1464                 WARN_ON(1);
1465                 break;
1466         }
1467         dev_kfree_skb_any(skb);
1468         create_event(cm_node, type);
1469 }
1470
1471 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1472 {
1473         switch (cm_node->state) {
1474         case NES_CM_STATE_SYN_SENT:
1475         case NES_CM_STATE_MPAREQ_SENT:
1476                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1477                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1478                         cm_node->listener, cm_node->state);
1479                 active_open_err(cm_node, skb, 1);
1480                 break;
1481         case NES_CM_STATE_ESTABLISHED:
1482         case NES_CM_STATE_SYN_RCVD:
1483                 passive_open_err(cm_node, skb, 1);
1484                 break;
1485         case NES_CM_STATE_TSA:
1486         default:
1487                 drop_packet(skb);
1488         }
1489 }
1490
1491 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1492         struct sk_buff *skb)
1493 {
1494         int err;
1495
1496         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1497         if (err)
1498                 active_open_err(cm_node, skb, 1);
1499
1500         return err;
1501 }
1502
1503 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1504         struct sk_buff *skb)
1505 {
1506         int err = 0;
1507         u32 seq;
1508         u32 ack_seq;
1509         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1510         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1511         u32 rcv_wnd;
1512         seq = ntohl(tcph->seq);
1513         ack_seq = ntohl(tcph->ack_seq);
1514         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1515         if (ack_seq != loc_seq_num)
1516                 err = 1;
1517         else if ((seq + rcv_wnd) < rcv_nxt)
1518                 err = 1;
1519         if (err) {
1520                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1521                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1522                         cm_node->listener, cm_node->state);
1523                 indicate_pkt_err(cm_node, skb);
1524                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1525                         "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1526                         rcv_wnd);
1527         }
1528         return err;
1529 }
1530
1531 /*
1532  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1533  * is created with a listener or it may comein as rexmitted packet which in
1534  * that case will be just dropped.
1535  */
1536
1537 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1538         struct tcphdr *tcph)
1539 {
1540         int ret;
1541         u32 inc_sequence;
1542         int optionsize;
1543
1544         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1545         skb_trim(skb, 0);
1546         inc_sequence = ntohl(tcph->seq);
1547
1548         switch (cm_node->state) {
1549         case NES_CM_STATE_SYN_SENT:
1550         case NES_CM_STATE_MPAREQ_SENT:
1551                 /* Rcvd syn on active open connection*/
1552                 active_open_err(cm_node, skb, 1);
1553                 break;
1554         case NES_CM_STATE_LISTENING:
1555                 /* Passive OPEN */
1556                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1557                                 cm_node->listener->backlog) {
1558                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1559                                 "pressure \n");
1560                         cm_backlog_drops++;
1561                         passive_open_err(cm_node, skb, 0);
1562                         break;
1563                 }
1564                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1565                         1);
1566                 if (ret) {
1567                         passive_open_err(cm_node, skb, 0);
1568                         /* drop pkt */
1569                         break;
1570                 }
1571                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1572                 BUG_ON(cm_node->send_entry);
1573                 cm_node->accept_pend = 1;
1574                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1575
1576                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1577                 send_syn(cm_node, 1, skb);
1578                 break;
1579         case NES_CM_STATE_CLOSED:
1580                 cleanup_retrans_entry(cm_node);
1581                 send_reset(cm_node, skb);
1582                 break;
1583         case NES_CM_STATE_TSA:
1584         case NES_CM_STATE_ESTABLISHED:
1585         case NES_CM_STATE_FIN_WAIT1:
1586         case NES_CM_STATE_FIN_WAIT2:
1587         case NES_CM_STATE_MPAREQ_RCVD:
1588         case NES_CM_STATE_LAST_ACK:
1589         case NES_CM_STATE_CLOSING:
1590         case NES_CM_STATE_UNKNOWN:
1591         default:
1592                 drop_packet(skb);
1593                 break;
1594         }
1595 }
1596
1597 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1598         struct tcphdr *tcph)
1599 {
1600
1601         int ret;
1602         u32 inc_sequence;
1603         int optionsize;
1604
1605         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1606         skb_trim(skb, 0);
1607         inc_sequence = ntohl(tcph->seq);
1608         switch (cm_node->state) {
1609         case NES_CM_STATE_SYN_SENT:
1610                 cleanup_retrans_entry(cm_node);
1611                 /* active open */
1612                 if (check_syn(cm_node, tcph, skb))
1613                         return;
1614                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1615                 /* setup options */
1616                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1617                 if (ret) {
1618                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1619                                 cm_node);
1620                         break;
1621                 }
1622                 cleanup_retrans_entry(cm_node);
1623                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1624                 send_mpa_request(cm_node, skb);
1625                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1626                 break;
1627         case NES_CM_STATE_MPAREQ_RCVD:
1628                 /* passive open, so should not be here */
1629                 passive_open_err(cm_node, skb, 1);
1630                 break;
1631         case NES_CM_STATE_LISTENING:
1632         case NES_CM_STATE_CLOSED:
1633                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1634                 cleanup_retrans_entry(cm_node);
1635                 send_reset(cm_node, skb);
1636                 break;
1637         case NES_CM_STATE_ESTABLISHED:
1638         case NES_CM_STATE_FIN_WAIT1:
1639         case NES_CM_STATE_FIN_WAIT2:
1640         case NES_CM_STATE_LAST_ACK:
1641         case NES_CM_STATE_TSA:
1642         case NES_CM_STATE_CLOSING:
1643         case NES_CM_STATE_UNKNOWN:
1644         case NES_CM_STATE_MPAREQ_SENT:
1645         default:
1646                 drop_packet(skb);
1647                 break;
1648         }
1649 }
1650
1651 static void handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1652         struct tcphdr *tcph)
1653 {
1654         int datasize = 0;
1655         u32 inc_sequence;
1656         u32 rem_seq_ack;
1657         u32 rem_seq;
1658         int ret;
1659         int optionsize;
1660         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1661
1662         if (check_seq(cm_node, tcph, skb))
1663                 return;
1664
1665         skb_pull(skb, tcph->doff << 2);
1666         inc_sequence = ntohl(tcph->seq);
1667         rem_seq = ntohl(tcph->seq);
1668         rem_seq_ack =  ntohl(tcph->ack_seq);
1669         datasize = skb->len;
1670         cleanup_retrans_entry(cm_node);
1671         switch (cm_node->state) {
1672         case NES_CM_STATE_SYN_RCVD:
1673                 /* Passive OPEN */
1674                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1675                 if (ret)
1676                         break;
1677                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1678                 if (cm_node->tcp_cntxt.rem_ack_num !=
1679                     cm_node->tcp_cntxt.loc_seq_num) {
1680                         nes_debug(NES_DBG_CM, "rem_ack_num != loc_seq_num\n");
1681                         cleanup_retrans_entry(cm_node);
1682                         send_reset(cm_node, skb);
1683                         return;
1684                 }
1685                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1686                 cleanup_retrans_entry(cm_node);
1687                 if (datasize) {
1688                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1689                         handle_rcv_mpa(cm_node, skb);
1690                 } else { /* rcvd ACK only */
1691                         dev_kfree_skb_any(skb);
1692                         cleanup_retrans_entry(cm_node);
1693                  }
1694                 break;
1695         case NES_CM_STATE_ESTABLISHED:
1696                 /* Passive OPEN */
1697                 cleanup_retrans_entry(cm_node);
1698                 if (datasize) {
1699                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1700                         handle_rcv_mpa(cm_node, skb);
1701                 } else
1702                         drop_packet(skb);
1703                 break;
1704         case NES_CM_STATE_MPAREQ_SENT:
1705                 cleanup_retrans_entry(cm_node);
1706                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1707                 if (datasize) {
1708                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1709                         handle_rcv_mpa(cm_node, skb);
1710                 } else { /* Could be just an ack pkt.. */
1711                         cleanup_retrans_entry(cm_node);
1712                         dev_kfree_skb_any(skb);
1713                 }
1714                 break;
1715         case NES_CM_STATE_LISTENING:
1716         case NES_CM_STATE_CLOSED:
1717                 cleanup_retrans_entry(cm_node);
1718                 send_reset(cm_node, skb);
1719                 break;
1720         case NES_CM_STATE_LAST_ACK:
1721                 cleanup_retrans_entry(cm_node);
1722                 cm_node->state = NES_CM_STATE_CLOSED;
1723                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1724         case NES_CM_STATE_CLOSING:
1725                 cleanup_retrans_entry(cm_node);
1726                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1727                 drop_packet(skb);
1728                 break;
1729         case NES_CM_STATE_FIN_WAIT1:
1730                 cleanup_retrans_entry(cm_node);
1731                 drop_packet(skb);
1732                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1733                 break;
1734         case NES_CM_STATE_SYN_SENT:
1735         case NES_CM_STATE_FIN_WAIT2:
1736         case NES_CM_STATE_TSA:
1737         case NES_CM_STATE_MPAREQ_RCVD:
1738         case NES_CM_STATE_UNKNOWN:
1739         default:
1740                 drop_packet(skb);
1741                 break;
1742         }
1743 }
1744
1745
1746
1747 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1748         struct sk_buff *skb, int optionsize, int passive)
1749 {
1750         u8 *optionsloc = (u8 *)&tcph[1];
1751         if (optionsize) {
1752                 if (process_options(cm_node, optionsloc, optionsize,
1753                         (u32)tcph->syn)) {
1754                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
1755                                 __func__, cm_node);
1756                         if (passive)
1757                                 passive_open_err(cm_node, skb, 1);
1758                         else
1759                                 active_open_err(cm_node, skb, 1);
1760                         return 1;
1761                 }
1762         }
1763
1764         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1765                         cm_node->tcp_cntxt.snd_wscale;
1766
1767         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1768                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1769         return 0;
1770 }
1771
1772 /*
1773  * active_open_err() will send reset() if flag set..
1774  * It will also send ABORT event.
1775  */
1776
1777 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1778         int reset)
1779 {
1780         cleanup_retrans_entry(cm_node);
1781         if (reset) {
1782                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
1783                                 "state=%d\n", cm_node, cm_node->state);
1784                 add_ref_cm_node(cm_node);
1785                 send_reset(cm_node, skb);
1786         } else
1787                 dev_kfree_skb_any(skb);
1788
1789         cm_node->state = NES_CM_STATE_CLOSED;
1790         create_event(cm_node, NES_CM_EVENT_ABORTED);
1791 }
1792
1793 /*
1794  * passive_open_err() will either do a reset() or will free up the skb and
1795  * remove the cm_node.
1796  */
1797
1798 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1799         int reset)
1800 {
1801         cleanup_retrans_entry(cm_node);
1802         cm_node->state = NES_CM_STATE_CLOSED;
1803         if (reset) {
1804                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
1805                         "cm_node=%p state =%d\n", cm_node, cm_node->state);
1806                 send_reset(cm_node, skb);
1807         } else {
1808                 dev_kfree_skb_any(skb);
1809                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1810         }
1811 }
1812
1813 /*
1814  * free_retrans_entry() routines assumes that the retrans_list_lock has
1815  * been acquired before calling.
1816  */
1817 static void free_retrans_entry(struct nes_cm_node *cm_node)
1818 {
1819         struct nes_timer_entry *send_entry;
1820         send_entry = cm_node->send_entry;
1821         if (send_entry) {
1822                 cm_node->send_entry = NULL;
1823                 dev_kfree_skb_any(send_entry->skb);
1824                 kfree(send_entry);
1825                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1826         }
1827 }
1828
1829 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
1830 {
1831         unsigned long flags;
1832
1833         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1834         free_retrans_entry(cm_node);
1835         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1836 }
1837
1838 /**
1839  * process_packet
1840  * Returns skb if to be freed, else it will return NULL if already used..
1841  */
1842 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1843         struct nes_cm_core *cm_core)
1844 {
1845         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
1846         struct tcphdr *tcph = tcp_hdr(skb);
1847         u32     fin_set = 0;
1848         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1849
1850         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1851                 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1852                 tcph->ack, tcph->rst, tcph->fin);
1853
1854         if (tcph->rst)
1855                 pkt_type = NES_PKT_TYPE_RST;
1856         else if (tcph->syn) {
1857                 pkt_type = NES_PKT_TYPE_SYN;
1858                 if (tcph->ack)
1859                         pkt_type = NES_PKT_TYPE_SYNACK;
1860         } else if (tcph->ack)
1861                 pkt_type = NES_PKT_TYPE_ACK;
1862         if (tcph->fin)
1863                 fin_set = 1;
1864
1865         switch (pkt_type) {
1866         case NES_PKT_TYPE_SYN:
1867                 handle_syn_pkt(cm_node, skb, tcph);
1868                 break;
1869         case NES_PKT_TYPE_SYNACK:
1870                 handle_synack_pkt(cm_node, skb, tcph);
1871                 break;
1872         case NES_PKT_TYPE_ACK:
1873                 handle_ack_pkt(cm_node, skb, tcph);
1874                 if (fin_set)
1875                         handle_fin_pkt(cm_node);
1876                 break;
1877         case NES_PKT_TYPE_RST:
1878                 handle_rst_pkt(cm_node, skb, tcph);
1879                 break;
1880         default:
1881                 drop_packet(skb);
1882                 if (fin_set)
1883                         handle_fin_pkt(cm_node);
1884                 break;
1885         }
1886 }
1887
1888 /**
1889  * mini_cm_listen - create a listen node with params
1890  */
1891 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1892         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1893 {
1894         struct nes_cm_listener *listener;
1895         unsigned long flags;
1896
1897         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1898                 cm_info->loc_addr, cm_info->loc_port);
1899
1900         /* cannot have multiple matching listeners */
1901         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1902                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1903         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1904                 /* find automatically incs ref count ??? */
1905                 atomic_dec(&listener->ref_count);
1906                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1907                 return NULL;
1908         }
1909
1910         if (!listener) {
1911                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1912                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1913                 if (!listener) {
1914                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1915                         return NULL;
1916                 }
1917
1918                 listener->loc_addr = htonl(cm_info->loc_addr);
1919                 listener->loc_port = htons(cm_info->loc_port);
1920                 listener->reused_node = 0;
1921
1922                 atomic_set(&listener->ref_count, 1);
1923         }
1924         /* pasive case */
1925         /* find already inc'ed the ref count */
1926         else {
1927                 listener->reused_node = 1;
1928         }
1929
1930         listener->cm_id = cm_info->cm_id;
1931         atomic_set(&listener->pend_accepts_cnt, 0);
1932         listener->cm_core = cm_core;
1933         listener->nesvnic = nesvnic;
1934         atomic_inc(&cm_core->node_cnt);
1935
1936         listener->conn_type = cm_info->conn_type;
1937         listener->backlog = cm_info->backlog;
1938         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1939
1940         if (!listener->reused_node) {
1941                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1942                 list_add(&listener->list, &cm_core->listen_list.list);
1943                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1944                 atomic_inc(&cm_core->listen_node_cnt);
1945         }
1946
1947         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
1948                         " listener = %p, backlog = %d, cm_id = %p.\n",
1949                         cm_info->loc_addr, cm_info->loc_port,
1950                         listener, listener->backlog, listener->cm_id);
1951
1952         return listener;
1953 }
1954
1955
1956 /**
1957  * mini_cm_connect - make a connection node with params
1958  */
1959 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1960         struct nes_vnic *nesvnic, u16 private_data_len,
1961         void *private_data, struct nes_cm_info *cm_info)
1962 {
1963         int ret = 0;
1964         struct nes_cm_node *cm_node;
1965         struct nes_cm_listener *loopbackremotelistener;
1966         struct nes_cm_node *loopbackremotenode;
1967         struct nes_cm_info loopback_cm_info;
1968         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
1969         struct ietf_mpa_frame *mpa_frame = NULL;
1970
1971         /* create a CM connection node */
1972         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
1973         if (!cm_node)
1974                 return NULL;
1975         mpa_frame = &cm_node->mpa_frame;
1976         strcpy(mpa_frame->key, IEFT_MPA_KEY_REQ);
1977         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
1978         mpa_frame->rev =  IETF_MPA_VERSION;
1979         mpa_frame->priv_data_len = htons(private_data_len);
1980
1981         /* set our node side to client (active) side */
1982         cm_node->tcp_cntxt.client = 1;
1983         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1984
1985         if (cm_info->loc_addr == cm_info->rem_addr) {
1986                 loopbackremotelistener = find_listener(cm_core,
1987                                 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
1988                                 NES_CM_LISTENER_ACTIVE_STATE);
1989                 if (loopbackremotelistener == NULL) {
1990                         create_event(cm_node, NES_CM_EVENT_ABORTED);
1991                 } else {
1992                         loopback_cm_info = *cm_info;
1993                         loopback_cm_info.loc_port = cm_info->rem_port;
1994                         loopback_cm_info.rem_port = cm_info->loc_port;
1995                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
1996                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
1997                                 &loopback_cm_info, loopbackremotelistener);
1998                         if (!loopbackremotenode) {
1999                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2000                                 return NULL;
2001                         }
2002                         atomic_inc(&cm_loopbacks);
2003                         loopbackremotenode->loopbackpartner = cm_node;
2004                         loopbackremotenode->tcp_cntxt.rcv_wscale =
2005                                 NES_CM_DEFAULT_RCV_WND_SCALE;
2006                         cm_node->loopbackpartner = loopbackremotenode;
2007                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2008                                 private_data_len);
2009                         loopbackremotenode->mpa_frame_size = private_data_len;
2010
2011                         /* we are done handling this state. */
2012                         /* set node to a TSA state */
2013                         cm_node->state = NES_CM_STATE_TSA;
2014                         cm_node->tcp_cntxt.rcv_nxt =
2015                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
2016                         loopbackremotenode->tcp_cntxt.rcv_nxt =
2017                                 cm_node->tcp_cntxt.loc_seq_num;
2018                         cm_node->tcp_cntxt.max_snd_wnd =
2019                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2020                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
2021                                 cm_node->tcp_cntxt.rcv_wnd;
2022                         cm_node->tcp_cntxt.snd_wnd =
2023                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2024                         loopbackremotenode->tcp_cntxt.snd_wnd =
2025                                 cm_node->tcp_cntxt.rcv_wnd;
2026                         cm_node->tcp_cntxt.snd_wscale =
2027                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
2028                         loopbackremotenode->tcp_cntxt.snd_wscale =
2029                                 cm_node->tcp_cntxt.rcv_wscale;
2030                         loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2031                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2032                 }
2033                 return cm_node;
2034         }
2035
2036         /* set our node side to client (active) side */
2037         cm_node->tcp_cntxt.client = 1;
2038         /* init our MPA frame ptr */
2039         memcpy(mpa_frame->priv_data, private_data, private_data_len);
2040
2041         cm_node->mpa_frame_size = mpa_frame_size;
2042
2043         /* send a syn and goto syn sent state */
2044         cm_node->state = NES_CM_STATE_SYN_SENT;
2045         ret = send_syn(cm_node, 0, NULL);
2046
2047         if (ret) {
2048                 /* error in sending the syn free up the cm_node struct */
2049                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2050                         "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2051                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2052                         cm_node->cm_id);
2053                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2054                 cm_node = NULL;
2055         }
2056
2057         if (cm_node)
2058                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2059                         "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2060                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2061                         cm_node->cm_id);
2062
2063         return cm_node;
2064 }
2065
2066
2067 /**
2068  * mini_cm_accept - accept a connection
2069  * This function is never called
2070  */
2071 static int mini_cm_accept(struct nes_cm_core *cm_core,
2072         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2073 {
2074         return 0;
2075 }
2076
2077
2078 /**
2079  * mini_cm_reject - reject and teardown a connection
2080  */
2081 static int mini_cm_reject(struct nes_cm_core *cm_core,
2082         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2083 {
2084         int ret = 0;
2085         int err = 0;
2086         int passive_state;
2087         struct nes_cm_event event;
2088         struct iw_cm_id *cm_id = cm_node->cm_id;
2089         struct nes_cm_node *loopback = cm_node->loopbackpartner;
2090
2091         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2092                 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2093
2094         if (cm_node->tcp_cntxt.client)
2095                 return ret;
2096         cleanup_retrans_entry(cm_node);
2097
2098         if (!loopback) {
2099                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2100                 if (passive_state == NES_SEND_RESET_EVENT) {
2101                         cm_node->state = NES_CM_STATE_CLOSED;
2102                         rem_ref_cm_node(cm_core, cm_node);
2103                 } else {
2104                         ret = send_mpa_reject(cm_node);
2105                         if (ret) {
2106                                 cm_node->state = NES_CM_STATE_CLOSED;
2107                                 err = send_reset(cm_node, NULL);
2108                                 if (err)
2109                                         WARN_ON(1);
2110                         } else
2111                                 cm_id->add_ref(cm_id);
2112                 }
2113         } else {
2114                 cm_node->cm_id = NULL;
2115                 event.cm_node = loopback;
2116                 event.cm_info.rem_addr = loopback->rem_addr;
2117                 event.cm_info.loc_addr = loopback->loc_addr;
2118                 event.cm_info.rem_port = loopback->rem_port;
2119                 event.cm_info.loc_port = loopback->loc_port;
2120                 event.cm_info.cm_id = loopback->cm_id;
2121                 cm_event_mpa_reject(&event);
2122                 rem_ref_cm_node(cm_core, cm_node);
2123                 loopback->state = NES_CM_STATE_CLOSING;
2124
2125                 cm_id = loopback->cm_id;
2126                 rem_ref_cm_node(cm_core, loopback);
2127                 cm_id->rem_ref(cm_id);
2128         }
2129
2130         return ret;
2131 }
2132
2133
2134 /**
2135  * mini_cm_close
2136  */
2137 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2138 {
2139         int ret = 0;
2140
2141         if (!cm_core || !cm_node)
2142                 return -EINVAL;
2143
2144         switch (cm_node->state) {
2145         case NES_CM_STATE_SYN_RCVD:
2146         case NES_CM_STATE_SYN_SENT:
2147         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2148         case NES_CM_STATE_ESTABLISHED:
2149         case NES_CM_STATE_ACCEPTING:
2150         case NES_CM_STATE_MPAREQ_SENT:
2151         case NES_CM_STATE_MPAREQ_RCVD:
2152                 cleanup_retrans_entry(cm_node);
2153                 send_reset(cm_node, NULL);
2154                 break;
2155         case NES_CM_STATE_CLOSE_WAIT:
2156                 cm_node->state = NES_CM_STATE_LAST_ACK;
2157                 send_fin(cm_node, NULL);
2158                 break;
2159         case NES_CM_STATE_FIN_WAIT1:
2160         case NES_CM_STATE_FIN_WAIT2:
2161         case NES_CM_STATE_LAST_ACK:
2162         case NES_CM_STATE_TIME_WAIT:
2163         case NES_CM_STATE_CLOSING:
2164                 ret = -1;
2165                 break;
2166         case NES_CM_STATE_MPAREJ_RCVD:
2167         case NES_CM_STATE_LISTENING:
2168         case NES_CM_STATE_UNKNOWN:
2169         case NES_CM_STATE_INITED:
2170         case NES_CM_STATE_CLOSED:
2171                 ret = rem_ref_cm_node(cm_core, cm_node);
2172                 break;
2173         case NES_CM_STATE_TSA:
2174                 if (cm_node->send_entry)
2175                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2176                                 "send_entry=%p\n", cm_node->send_entry);
2177                 ret = rem_ref_cm_node(cm_core, cm_node);
2178                 break;
2179         }
2180         return ret;
2181 }
2182
2183
2184 /**
2185  * recv_pkt - recv an ETHERNET packet, and process it through CM
2186  * node state machine
2187  */
2188 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2189         struct nes_vnic *nesvnic, struct sk_buff *skb)
2190 {
2191         struct nes_cm_node *cm_node = NULL;
2192         struct nes_cm_listener *listener = NULL;
2193         struct iphdr *iph;
2194         struct tcphdr *tcph;
2195         struct nes_cm_info nfo;
2196         int skb_handled = 1;
2197         __be32 tmp_daddr, tmp_saddr;
2198
2199         if (!skb)
2200                 return 0;
2201         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2202                 return 0;
2203         }
2204
2205         iph = (struct iphdr *)skb->data;
2206         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2207
2208         nfo.loc_addr = ntohl(iph->daddr);
2209         nfo.loc_port = ntohs(tcph->dest);
2210         nfo.rem_addr = ntohl(iph->saddr);
2211         nfo.rem_port = ntohs(tcph->source);
2212
2213         tmp_daddr = cpu_to_be32(iph->daddr);
2214         tmp_saddr = cpu_to_be32(iph->saddr);
2215
2216         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2217                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2218
2219         do {
2220                 cm_node = find_node(cm_core,
2221                         nfo.rem_port, nfo.rem_addr,
2222                         nfo.loc_port, nfo.loc_addr);
2223
2224                 if (!cm_node) {
2225                         /* Only type of packet accepted are for */
2226                         /* the PASSIVE open (syn only) */
2227                         if ((!tcph->syn) || (tcph->ack)) {
2228                                 skb_handled = 0;
2229                                 break;
2230                         }
2231                         listener = find_listener(cm_core, nfo.loc_addr,
2232                                 nfo.loc_port,
2233                                 NES_CM_LISTENER_ACTIVE_STATE);
2234                         if (!listener) {
2235                                 nfo.cm_id = NULL;
2236                                 nfo.conn_type = 0;
2237                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2238                                 skb_handled = 0;
2239                                 break;
2240                         }
2241                         nfo.cm_id = listener->cm_id;
2242                         nfo.conn_type = listener->conn_type;
2243                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2244                                 listener);
2245                         if (!cm_node) {
2246                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2247                                         "node\n");
2248                                 cm_packets_dropped++;
2249                                 atomic_dec(&listener->ref_count);
2250                                 dev_kfree_skb_any(skb);
2251                                 break;
2252                         }
2253                         if (!tcph->rst && !tcph->fin) {
2254                                 cm_node->state = NES_CM_STATE_LISTENING;
2255                         } else {
2256                                 cm_packets_dropped++;
2257                                 rem_ref_cm_node(cm_core, cm_node);
2258                                 dev_kfree_skb_any(skb);
2259                                 break;
2260                         }
2261                         add_ref_cm_node(cm_node);
2262                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2263                         rem_ref_cm_node(cm_core, cm_node);
2264                         atomic_inc(&cm_accel_dropped_pkts);
2265                         dev_kfree_skb_any(skb);
2266                         break;
2267                 }
2268                 skb_reset_network_header(skb);
2269                 skb_set_transport_header(skb, sizeof(*tcph));
2270                 skb->len = ntohs(iph->tot_len);
2271                 process_packet(cm_node, skb, cm_core);
2272                 rem_ref_cm_node(cm_core, cm_node);
2273         } while (0);
2274         return skb_handled;
2275 }
2276
2277
2278 /**
2279  * nes_cm_alloc_core - allocate a top level instance of a cm core
2280  */
2281 static struct nes_cm_core *nes_cm_alloc_core(void)
2282 {
2283         struct nes_cm_core *cm_core;
2284
2285         /* setup the CM core */
2286         /* alloc top level core control structure */
2287         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2288         if (!cm_core)
2289                 return NULL;
2290
2291         INIT_LIST_HEAD(&cm_core->connected_nodes);
2292         init_timer(&cm_core->tcp_timer);
2293         cm_core->tcp_timer.function = nes_cm_timer_tick;
2294
2295         cm_core->mtu   = NES_CM_DEFAULT_MTU;
2296         cm_core->state = NES_CM_STATE_INITED;
2297         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2298
2299         atomic_set(&cm_core->events_posted, 0);
2300
2301         cm_core->api = &nes_cm_api;
2302
2303         spin_lock_init(&cm_core->ht_lock);
2304         spin_lock_init(&cm_core->listen_list_lock);
2305
2306         INIT_LIST_HEAD(&cm_core->listen_list.list);
2307
2308         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2309
2310         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2311         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2312         cm_core->post_event = nes_cm_post_event;
2313         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2314         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2315
2316         print_core(cm_core);
2317         return cm_core;
2318 }
2319
2320
2321 /**
2322  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2323  */
2324 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2325 {
2326         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2327
2328         if (!cm_core)
2329                 return -EINVAL;
2330
2331         barrier();
2332
2333         if (timer_pending(&cm_core->tcp_timer)) {
2334                 del_timer(&cm_core->tcp_timer);
2335         }
2336
2337         destroy_workqueue(cm_core->event_wq);
2338         destroy_workqueue(cm_core->disconn_wq);
2339         nes_debug(NES_DBG_CM, "\n");
2340         kfree(cm_core);
2341
2342         return 0;
2343 }
2344
2345
2346 /**
2347  * mini_cm_get
2348  */
2349 static int mini_cm_get(struct nes_cm_core *cm_core)
2350 {
2351         return cm_core->state;
2352 }
2353
2354
2355 /**
2356  * mini_cm_set
2357  */
2358 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2359 {
2360         int ret = 0;
2361
2362         switch (type) {
2363         case NES_CM_SET_PKT_SIZE:
2364                 cm_core->mtu = value;
2365                 break;
2366         case NES_CM_SET_FREE_PKT_Q_SIZE:
2367                 cm_core->free_tx_pkt_max = value;
2368                 break;
2369         default:
2370                 /* unknown set option */
2371                 ret = -EINVAL;
2372         }
2373
2374         return ret;
2375 }
2376
2377
2378 /**
2379  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2380  * successfully exchanged when this is called
2381  */
2382 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2383 {
2384         int ret = 0;
2385
2386         if (!nesqp)
2387                 return -EINVAL;
2388
2389         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2390                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2391                         NES_QPCONTEXT_MISC_DROS);
2392
2393         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2394                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2395
2396         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2397
2398         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2399
2400         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2401                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2402
2403         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2404                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2405                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2406
2407         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2408                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2409                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2410
2411         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2412         nesqp->nesqp_context->ts_recent = 0;
2413         nesqp->nesqp_context->ts_age = 0;
2414         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2415         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2416         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2417         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2418                         cm_node->tcp_cntxt.rcv_wscale);
2419         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2420         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2421         nesqp->nesqp_context->srtt = 0;
2422         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2423         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2424         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2425         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2426         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2427         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2428
2429         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2430                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2431                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2432                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2433                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2434                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2435                         le32_to_cpu(nesqp->nesqp_context->misc));
2436         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2437         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2438         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2439
2440         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2441         cm_node->state = NES_CM_STATE_TSA;
2442
2443         return ret;
2444 }
2445
2446
2447 /**
2448  * nes_cm_disconn
2449  */
2450 int nes_cm_disconn(struct nes_qp *nesqp)
2451 {
2452         unsigned long flags;
2453
2454         spin_lock_irqsave(&nesqp->lock, flags);
2455         if (nesqp->disconn_pending == 0) {
2456                 nesqp->disconn_pending++;
2457                 spin_unlock_irqrestore(&nesqp->lock, flags);
2458                 /* init our disconnect work element, to */
2459                 INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);
2460
2461                 queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
2462         } else
2463                 spin_unlock_irqrestore(&nesqp->lock, flags);
2464
2465         return 0;
2466 }
2467
2468
2469 /**
2470  * nes_disconnect_worker
2471  */
2472 static void nes_disconnect_worker(struct work_struct *work)
2473 {
2474         struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);
2475
2476         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2477                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2478         nes_cm_disconn_true(nesqp);
2479 }
2480
2481
2482 /**
2483  * nes_cm_disconn_true
2484  */
2485 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2486 {
2487         unsigned long flags;
2488         int ret = 0;
2489         struct iw_cm_id *cm_id;
2490         struct iw_cm_event cm_event;
2491         struct nes_vnic *nesvnic;
2492         u16 last_ae;
2493         u8 original_hw_tcp_state;
2494         u8 original_ibqp_state;
2495         u8 issued_disconnect_reset = 0;
2496
2497         if (!nesqp) {
2498                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2499                 return -1;
2500         }
2501
2502         spin_lock_irqsave(&nesqp->lock, flags);
2503         cm_id = nesqp->cm_id;
2504         /* make sure we havent already closed this connection */
2505         if (!cm_id) {
2506                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2507                                 nesqp->hwqp.qp_id);
2508                 spin_unlock_irqrestore(&nesqp->lock, flags);
2509                 return -1;
2510         }
2511
2512         nesvnic = to_nesvnic(nesqp->ibqp.device);
2513         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2514
2515         original_hw_tcp_state = nesqp->hw_tcp_state;
2516         original_ibqp_state   = nesqp->ibqp_state;
2517         last_ae = nesqp->last_aeq;
2518
2519
2520         nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);
2521
2522         if ((nesqp->cm_id) && (cm_id->event_handler)) {
2523                 if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2524                                 ((original_ibqp_state == IB_QPS_RTS) &&
2525                                 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2526                         atomic_inc(&cm_disconnects);
2527                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2528                         if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
2529                                 cm_event.status = IW_CM_EVENT_STATUS_RESET;
2530                                 nes_debug(NES_DBG_CM, "Generating a CM "
2531                                         "Disconnect Event (status reset) for "
2532                                         "QP%u, cm_id = %p. \n",
2533                                         nesqp->hwqp.qp_id, cm_id);
2534                         } else
2535                                 cm_event.status = IW_CM_EVENT_STATUS_OK;
2536
2537                         cm_event.local_addr = cm_id->local_addr;
2538                         cm_event.remote_addr = cm_id->remote_addr;
2539                         cm_event.private_data = NULL;
2540                         cm_event.private_data_len = 0;
2541
2542                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2543                                 " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2544                                 "cm_id = %p, refcount = %u.\n",
2545                                 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2546                                 nesqp->hwqp.sq_tail, cm_id,
2547                                 atomic_read(&nesqp->refcount));
2548
2549                         spin_unlock_irqrestore(&nesqp->lock, flags);
2550                         ret = cm_id->event_handler(cm_id, &cm_event);
2551                         if (ret)
2552                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2553                                         "returned, ret=%d\n", ret);
2554                         spin_lock_irqsave(&nesqp->lock, flags);
2555                 }
2556
2557                 nesqp->disconn_pending = 0;
2558                 /* There might have been another AE while the lock was released */
2559                 original_hw_tcp_state = nesqp->hw_tcp_state;
2560                 original_ibqp_state   = nesqp->ibqp_state;
2561                 last_ae = nesqp->last_aeq;
2562
2563                 if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
2564                                 ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2565                                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2566                                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2567                                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2568                         atomic_inc(&cm_closes);
2569                         nesqp->cm_id = NULL;
2570                         nesqp->in_disconnect = 0;
2571                         spin_unlock_irqrestore(&nesqp->lock, flags);
2572                         nes_disconnect(nesqp, 1);
2573
2574                         cm_id->provider_data = nesqp;
2575                         /* Send up the close complete event */
2576                         cm_event.event = IW_CM_EVENT_CLOSE;
2577                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2578                         cm_event.provider_data = cm_id->provider_data;
2579                         cm_event.local_addr = cm_id->local_addr;
2580                         cm_event.remote_addr = cm_id->remote_addr;
2581                         cm_event.private_data = NULL;
2582                         cm_event.private_data_len = 0;
2583
2584                         ret = cm_id->event_handler(cm_id, &cm_event);
2585                         if (ret) {
2586                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2587                         }
2588
2589                         cm_id->rem_ref(cm_id);
2590
2591                         spin_lock_irqsave(&nesqp->lock, flags);
2592                         if (nesqp->flush_issued == 0) {
2593                                 nesqp->flush_issued = 1;
2594                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2595                                 flush_wqes(nesvnic->nesdev, nesqp,
2596                                         NES_CQP_FLUSH_RQ, 1);
2597                         } else
2598                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2599                 } else {
2600                         cm_id = nesqp->cm_id;
2601                         spin_unlock_irqrestore(&nesqp->lock, flags);
2602                         /* check to see if the inbound reset beat the outbound reset */
2603                         if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
2604                                 nes_debug(NES_DBG_CM, "QP%u: Decing refcount "
2605                                         "due to inbound reset beating the "
2606                                         "outbound reset.\n", nesqp->hwqp.qp_id);
2607                         }
2608                 }
2609         } else {
2610                 nesqp->disconn_pending = 0;
2611                 spin_unlock_irqrestore(&nesqp->lock, flags);
2612         }
2613
2614         return 0;
2615 }
2616
2617
2618 /**
2619  * nes_disconnect
2620  */
2621 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2622 {
2623         int ret = 0;
2624         struct nes_vnic *nesvnic;
2625         struct nes_device *nesdev;
2626         struct nes_ib_device *nesibdev;
2627
2628         nesvnic = to_nesvnic(nesqp->ibqp.device);
2629         if (!nesvnic)
2630                 return -EINVAL;
2631
2632         nesdev = nesvnic->nesdev;
2633         nesibdev = nesvnic->nesibdev;
2634
2635         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2636                         atomic_read(&nesvnic->netdev->refcnt));
2637
2638         if (nesqp->active_conn) {
2639
2640                 /* indicate this connection is NOT active */
2641                 nesqp->active_conn = 0;
2642         } else {
2643                 /* Need to free the Last Streaming Mode Message */
2644                 if (nesqp->ietf_frame) {
2645                         if (nesqp->lsmm_mr)
2646                                 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2647                         pci_free_consistent(nesdev->pcidev,
2648                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2649                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2650                 }
2651         }
2652
2653         /* close the CM node down if it is still active */
2654         if (nesqp->cm_node) {
2655                 nes_debug(NES_DBG_CM, "Call close API\n");
2656
2657                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2658         }
2659
2660         return ret;
2661 }
2662
2663
2664 /**
2665  * nes_accept
2666  */
2667 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2668 {
2669         u64 u64temp;
2670         struct ib_qp *ibqp;
2671         struct nes_qp *nesqp;
2672         struct nes_vnic *nesvnic;
2673         struct nes_device *nesdev;
2674         struct nes_cm_node *cm_node;
2675         struct nes_adapter *adapter;
2676         struct ib_qp_attr attr;
2677         struct iw_cm_event cm_event;
2678         struct nes_hw_qp_wqe *wqe;
2679         struct nes_v4_quad nes_quad;
2680         u32 crc_value;
2681         int ret;
2682         int passive_state;
2683         struct nes_ib_device *nesibdev;
2684         struct ib_mr *ibmr = NULL;
2685         struct ib_phys_buf ibphysbuf;
2686         struct nes_pd *nespd;
2687         u64 tagged_offset;
2688
2689
2690
2691         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2692         if (!ibqp)
2693                 return -EINVAL;
2694
2695         /* get all our handles */
2696         nesqp = to_nesqp(ibqp);
2697         nesvnic = to_nesvnic(nesqp->ibqp.device);
2698         nesdev = nesvnic->nesdev;
2699         adapter = nesdev->nesadapter;
2700
2701         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2702         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2703                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2704                 nesvnic->netdev->name);
2705
2706         /* associate the node with the QP */
2707         nesqp->cm_node = (void *)cm_node;
2708         cm_node->nesqp = nesqp;
2709         nes_add_ref(&nesqp->ibqp);
2710
2711         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
2712                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2713         atomic_inc(&cm_accepts);
2714
2715         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2716                         atomic_read(&nesvnic->netdev->refcnt));
2717
2718         /* allocate the ietf frame and space for private data */
2719         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2720                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2721                 &nesqp->ietf_frame_pbase);
2722
2723         if (!nesqp->ietf_frame) {
2724                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
2725                         "data\n");
2726                 return -ENOMEM;
2727         }
2728
2729
2730         /* setup the MPA frame */
2731         nesqp->private_data_len = conn_param->private_data_len;
2732         memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2733
2734         memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2735                         conn_param->private_data_len);
2736
2737         nesqp->ietf_frame->priv_data_len =
2738                 cpu_to_be16(conn_param->private_data_len);
2739         nesqp->ietf_frame->rev = mpa_version;
2740         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2741
2742         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2743         wqe = &nesqp->hwqp.sq_vbase[0];
2744
2745         if (cm_id->remote_addr.sin_addr.s_addr !=
2746                         cm_id->local_addr.sin_addr.s_addr) {
2747                 u64temp = (unsigned long)nesqp;
2748                 nesibdev = nesvnic->nesibdev;
2749                 nespd = nesqp->nespd;
2750                 ibphysbuf.addr = nesqp->ietf_frame_pbase;
2751                 ibphysbuf.size = conn_param->private_data_len +
2752                                         sizeof(struct ietf_mpa_frame);
2753                 tagged_offset = (u64)(unsigned long)nesqp->ietf_frame;
2754                 ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
2755                                                 &ibphysbuf, 1,
2756                                                 IB_ACCESS_LOCAL_WRITE,
2757                                                 &tagged_offset);
2758                 if (!ibmr) {
2759                         nes_debug(NES_DBG_CM, "Unable to register memory region"
2760                                         "for lSMM for cm_node = %p \n",
2761                                         cm_node);
2762                         return -ENOMEM;
2763                 }
2764
2765                 ibmr->pd = &nespd->ibpd;
2766                 ibmr->device = nespd->ibpd.device;
2767                 nesqp->lsmm_mr = ibmr;
2768
2769                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2770                 set_wqe_64bit_value(wqe->wqe_words,
2771                         NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2772                         u64temp);
2773                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2774                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2775                         NES_IWARP_SQ_WQE_WRPDU);
2776                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2777                         cpu_to_le32(conn_param->private_data_len +
2778                         sizeof(struct ietf_mpa_frame));
2779                 set_wqe_64bit_value(wqe->wqe_words,
2780                                         NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
2781                                         (u64)(unsigned long)nesqp->ietf_frame);
2782                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2783                         cpu_to_le32(conn_param->private_data_len +
2784                         sizeof(struct ietf_mpa_frame));
2785                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
2786
2787                 nesqp->nesqp_context->ird_ord_sizes |=
2788                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2789                         NES_QPCONTEXT_ORDIRD_WRPDU);
2790         } else {
2791                 nesqp->nesqp_context->ird_ord_sizes |=
2792                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
2793         }
2794         nesqp->skip_lsmm = 1;
2795
2796
2797         /* Cache the cm_id in the qp */
2798         nesqp->cm_id = cm_id;
2799         cm_node->cm_id = cm_id;
2800
2801         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2802         cm_id->provider_data = nesqp;
2803         nesqp->active_conn   = 0;
2804
2805         if (cm_node->state == NES_CM_STATE_TSA)
2806                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2807                         cm_node);
2808
2809         nes_cm_init_tsa_conn(nesqp, cm_node);
2810
2811         nesqp->nesqp_context->tcpPorts[0] =
2812                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2813         nesqp->nesqp_context->tcpPorts[1] =
2814                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2815
2816         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2817                 nesqp->nesqp_context->ip0 =
2818                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2819         else
2820                 nesqp->nesqp_context->ip0 =
2821                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2822
2823         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2824                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2825                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2826
2827         nesqp->nesqp_context->arp_index_vlan |=
2828                 cpu_to_le32(nes_arp_table(nesdev,
2829                         le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2830                         NES_ARP_RESOLVE) << 16);
2831
2832         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2833                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2834
2835         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2836
2837         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2838                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2839         nesqp->nesqp_context->ird_ord_sizes |=
2840                 cpu_to_le32((u32)conn_param->ord);
2841
2842         memset(&nes_quad, 0, sizeof(nes_quad));
2843         nes_quad.DstIpAdrIndex =
2844                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2845         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2846                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2847         else
2848                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2849         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2850         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2851
2852         /* Produce hash key */
2853         crc_value = get_crc_value(&nes_quad);
2854         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2855         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2856                 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2857
2858         nesqp->hte_index &= adapter->hte_index_mask;
2859         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2860
2861         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2862
2863         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2864                         "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2865                         "private data length=%zu.\n", nesqp->hwqp.qp_id,
2866                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2867                         ntohs(cm_id->remote_addr.sin_port),
2868                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2869                         ntohs(cm_id->local_addr.sin_port),
2870                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2871                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2872                         conn_param->private_data_len +
2873                         sizeof(struct ietf_mpa_frame));
2874
2875
2876         /* notify OF layer that accept event was successful */
2877         cm_id->add_ref(cm_id);
2878
2879         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2880         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2881         cm_event.provider_data = (void *)nesqp;
2882         cm_event.local_addr = cm_id->local_addr;
2883         cm_event.remote_addr = cm_id->remote_addr;
2884         cm_event.private_data = NULL;
2885         cm_event.private_data_len = 0;
2886         ret = cm_id->event_handler(cm_id, &cm_event);
2887         attr.qp_state = IB_QPS_RTS;
2888         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2889         if (cm_node->loopbackpartner) {
2890                 cm_node->loopbackpartner->mpa_frame_size =
2891                         nesqp->private_data_len;
2892                 /* copy entire MPA frame to our cm_node's frame */
2893                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2894                         nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2895                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2896         }
2897         if (ret)
2898                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2899                         "ret=%d\n", __func__, __LINE__, ret);
2900
2901         passive_state = atomic_add_return(1, &cm_node->passive_state);
2902         if (passive_state == NES_SEND_RESET_EVENT)
2903                 create_event(cm_node, NES_CM_EVENT_RESET);
2904         return 0;
2905 }
2906
2907
2908 /**
2909  * nes_reject
2910  */
2911 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2912 {
2913         struct nes_cm_node *cm_node;
2914         struct nes_cm_node *loopback;
2915
2916         struct nes_cm_core *cm_core;
2917
2918         atomic_inc(&cm_rejects);
2919         cm_node = (struct nes_cm_node *) cm_id->provider_data;
2920         loopback = cm_node->loopbackpartner;
2921         cm_core = cm_node->cm_core;
2922         cm_node->cm_id = cm_id;
2923         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
2924
2925         if (cm_node->mpa_frame_size > MAX_CM_BUFFER)
2926                 return -EINVAL;
2927
2928         strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
2929         if (loopback) {
2930                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
2931                 loopback->mpa_frame.priv_data_len = pdata_len;
2932                 loopback->mpa_frame_size = sizeof(struct ietf_mpa_frame) +
2933                                 pdata_len;
2934         } else {
2935                 memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
2936                 cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
2937         }
2938
2939         cm_node->mpa_frame.rev = mpa_version;
2940         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
2941
2942         return cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
2943 }
2944
2945
2946 /**
2947  * nes_connect
2948  * setup and launch cm connect node
2949  */
2950 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2951 {
2952         struct ib_qp *ibqp;
2953         struct nes_qp *nesqp;
2954         struct nes_vnic *nesvnic;
2955         struct nes_device *nesdev;
2956         struct nes_cm_node *cm_node;
2957         struct nes_cm_info cm_info;
2958         int apbvt_set = 0;
2959
2960         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2961         if (!ibqp)
2962                 return -EINVAL;
2963         nesqp = to_nesqp(ibqp);
2964         if (!nesqp)
2965                 return -EINVAL;
2966         nesvnic = to_nesvnic(nesqp->ibqp.device);
2967         if (!nesvnic)
2968                 return -EINVAL;
2969         nesdev  = nesvnic->nesdev;
2970         if (!nesdev)
2971                 return -EINVAL;
2972
2973         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
2974                 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
2975                 ntohl(nesvnic->local_ipaddr),
2976                 ntohl(cm_id->remote_addr.sin_addr.s_addr),
2977                 ntohs(cm_id->remote_addr.sin_port),
2978                 ntohl(cm_id->local_addr.sin_addr.s_addr),
2979                 ntohs(cm_id->local_addr.sin_port));
2980
2981         atomic_inc(&cm_connects);
2982         nesqp->active_conn = 1;
2983
2984         /* cache the cm_id in the qp */
2985         nesqp->cm_id = cm_id;
2986
2987         cm_id->provider_data = nesqp;
2988
2989         nesqp->private_data_len = conn_param->private_data_len;
2990         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2991         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
2992         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
2993                 conn_param->private_data_len);
2994
2995         if (cm_id->local_addr.sin_addr.s_addr !=
2996                 cm_id->remote_addr.sin_addr.s_addr) {
2997                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2998                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2999                 apbvt_set = 1;
3000         }
3001
3002         /* set up the connection params for the node */
3003         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3004         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3005         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3006         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3007         cm_info.cm_id = cm_id;
3008         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3009
3010         cm_id->add_ref(cm_id);
3011
3012         /* create a connect CM node connection */
3013         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3014                 conn_param->private_data_len, (void *)conn_param->private_data,
3015                 &cm_info);
3016         if (!cm_node) {
3017                 if (apbvt_set)
3018                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3019                                 PCI_FUNC(nesdev->pcidev->devfn),
3020                                 NES_MANAGE_APBVT_DEL);
3021
3022                 cm_id->rem_ref(cm_id);
3023                 return -ENOMEM;
3024         }
3025
3026         cm_node->apbvt_set = apbvt_set;
3027         nesqp->cm_node = cm_node;
3028         cm_node->nesqp = nesqp;
3029         nes_add_ref(&nesqp->ibqp);
3030
3031         return 0;
3032 }
3033
3034
3035 /**
3036  * nes_create_listen
3037  */
3038 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3039 {
3040         struct nes_vnic *nesvnic;
3041         struct nes_cm_listener *cm_node;
3042         struct nes_cm_info cm_info;
3043         struct nes_adapter *adapter;
3044         int err;
3045
3046
3047         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3048                         cm_id, ntohs(cm_id->local_addr.sin_port));
3049
3050         nesvnic = to_nesvnic(cm_id->device);
3051         if (!nesvnic)
3052                 return -EINVAL;
3053         adapter = nesvnic->nesdev->nesadapter;
3054         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3055                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3056
3057         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3058                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3059
3060         /* setup listen params in our api call struct */
3061         cm_info.loc_addr = nesvnic->local_ipaddr;
3062         cm_info.loc_port = cm_id->local_addr.sin_port;
3063         cm_info.backlog = backlog;
3064         cm_info.cm_id = cm_id;
3065
3066         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3067
3068
3069         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3070         if (!cm_node) {
3071                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3072                                 __func__, __LINE__);
3073                 return -ENOMEM;
3074         }
3075
3076         cm_id->provider_data = cm_node;
3077
3078         if (!cm_node->reused_node) {
3079                 err = nes_manage_apbvt(nesvnic,
3080                         ntohs(cm_id->local_addr.sin_port),
3081                         PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3082                         NES_MANAGE_APBVT_ADD);
3083                 if (err) {
3084                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3085                                 err);
3086                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3087                         return err;
3088                 }
3089                 cm_listens_created++;
3090         }
3091
3092         cm_id->add_ref(cm_id);
3093         cm_id->provider_data = (void *)cm_node;
3094
3095
3096         return 0;
3097 }
3098
3099
3100 /**
3101  * nes_destroy_listen
3102  */
3103 int nes_destroy_listen(struct iw_cm_id *cm_id)
3104 {
3105         if (cm_id->provider_data)
3106                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3107         else
3108                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3109
3110         cm_id->rem_ref(cm_id);
3111
3112         return 0;
3113 }
3114
3115
3116 /**
3117  * nes_cm_recv
3118  */
3119 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3120 {
3121         int rc = 0;
3122         cm_packets_received++;
3123         if ((g_cm_core) && (g_cm_core->api)) {
3124                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3125         } else {
3126                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3127                                 " cm is not setup properly.\n");
3128         }
3129
3130         return rc;
3131 }
3132
3133
3134 /**
3135  * nes_cm_start
3136  * Start and init a cm core module
3137  */
3138 int nes_cm_start(void)
3139 {
3140         nes_debug(NES_DBG_CM, "\n");
3141         /* create the primary CM core, pass this handle to subsequent core inits */
3142         g_cm_core = nes_cm_alloc_core();
3143         if (g_cm_core) {
3144                 return 0;
3145         } else {
3146                 return -ENOMEM;
3147         }
3148 }
3149
3150
3151 /**
3152  * nes_cm_stop
3153  * stop and dealloc all cm core instances
3154  */
3155 int nes_cm_stop(void)
3156 {
3157         g_cm_core->api->destroy_cm_core(g_cm_core);
3158         return 0;
3159 }
3160
3161
3162 /**
3163  * cm_event_connected
3164  * handle a connected event, setup QPs and HW
3165  */
3166 static void cm_event_connected(struct nes_cm_event *event)
3167 {
3168         u64 u64temp;
3169         struct nes_qp *nesqp;
3170         struct nes_vnic *nesvnic;
3171         struct nes_device *nesdev;
3172         struct nes_cm_node *cm_node;
3173         struct nes_adapter *nesadapter;
3174         struct ib_qp_attr attr;
3175         struct iw_cm_id *cm_id;
3176         struct iw_cm_event cm_event;
3177         struct nes_hw_qp_wqe *wqe;
3178         struct nes_v4_quad nes_quad;
3179         u32 crc_value;
3180         int ret;
3181
3182         /* get all our handles */
3183         cm_node = event->cm_node;
3184         cm_id = cm_node->cm_id;
3185         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3186         nesqp = (struct nes_qp *)cm_id->provider_data;
3187         nesvnic = to_nesvnic(nesqp->ibqp.device);
3188         nesdev = nesvnic->nesdev;
3189         nesadapter = nesdev->nesadapter;
3190
3191         if (nesqp->destroyed) {
3192                 return;
3193         }
3194         atomic_inc(&cm_connecteds);
3195         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3196                         " local port 0x%04X. jiffies = %lu.\n",
3197                         nesqp->hwqp.qp_id,
3198                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
3199                         ntohs(cm_id->remote_addr.sin_port),
3200                         ntohs(cm_id->local_addr.sin_port),
3201                         jiffies);
3202
3203         nes_cm_init_tsa_conn(nesqp, cm_node);
3204
3205         /* set the QP tsa context */
3206         nesqp->nesqp_context->tcpPorts[0] =
3207                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3208         nesqp->nesqp_context->tcpPorts[1] =
3209                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3210         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3211                 nesqp->nesqp_context->ip0 =
3212                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3213         else
3214                 nesqp->nesqp_context->ip0 =
3215                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3216
3217         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3218                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3219                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3220         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3221                         nes_arp_table(nesdev,
3222                         le32_to_cpu(nesqp->nesqp_context->ip0),
3223                         NULL, NES_ARP_RESOLVE) << 16);
3224         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3225                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3226         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3227         nesqp->nesqp_context->ird_ord_sizes |=
3228                         cpu_to_le32((u32)1 <<
3229                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3230
3231         /* Adjust tail for not having a LSMM */
3232         nesqp->hwqp.sq_tail = 1;
3233
3234 #if defined(NES_SEND_FIRST_WRITE)
3235         if (cm_node->send_write0) {
3236                 nes_debug(NES_DBG_CM, "Sending first write.\n");
3237                 wqe = &nesqp->hwqp.sq_vbase[0];
3238                 u64temp = (unsigned long)nesqp;
3239                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3240                 set_wqe_64bit_value(wqe->wqe_words,
3241                                 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3242                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3243                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3244                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3245                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3246                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3247                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3248                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3249
3250                 /* use the reserved spot on the WQ for the extra first WQE */
3251                 nesqp->nesqp_context->ird_ord_sizes &=
3252                         cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3253                                                 NES_QPCONTEXT_ORDIRD_WRPDU |
3254                                                 NES_QPCONTEXT_ORDIRD_ALSMM));
3255                 nesqp->skip_lsmm = 1;
3256                 nesqp->hwqp.sq_tail = 0;
3257                 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3258                                 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3259         }
3260 #endif
3261
3262         memset(&nes_quad, 0, sizeof(nes_quad));
3263
3264         nes_quad.DstIpAdrIndex =
3265                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3266         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3267                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3268         else
3269                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3270         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3271         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3272
3273         /* Produce hash key */
3274         crc_value = get_crc_value(&nes_quad);
3275         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3276         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3277                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3278
3279         nesqp->hte_index &= nesadapter->hte_index_mask;
3280         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3281
3282         nesqp->ietf_frame = &cm_node->mpa_frame;
3283         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3284         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3285
3286         /* notify OF layer we successfully created the requested connection */
3287         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3288         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
3289         cm_event.provider_data = cm_id->provider_data;
3290         cm_event.local_addr.sin_family = AF_INET;
3291         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3292         cm_event.remote_addr = cm_id->remote_addr;
3293
3294         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3295         cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3296
3297         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3298         ret = cm_id->event_handler(cm_id, &cm_event);
3299         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3300
3301         if (ret)
3302                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3303                         "ret=%d\n", __func__, __LINE__, ret);
3304         attr.qp_state = IB_QPS_RTS;
3305         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3306
3307         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3308                 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3309
3310         return;
3311 }
3312
3313
3314 /**
3315  * cm_event_connect_error
3316  */
3317 static void cm_event_connect_error(struct nes_cm_event *event)
3318 {
3319         struct nes_qp *nesqp;
3320         struct iw_cm_id *cm_id;
3321         struct iw_cm_event cm_event;
3322         /* struct nes_cm_info cm_info; */
3323         int ret;
3324
3325         if (!event->cm_node)
3326                 return;
3327
3328         cm_id = event->cm_node->cm_id;
3329         if (!cm_id) {
3330                 return;
3331         }
3332
3333         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3334         nesqp = cm_id->provider_data;
3335
3336         if (!nesqp) {
3337                 return;
3338         }
3339
3340         /* notify OF layer about this connection error event */
3341         /* cm_id->rem_ref(cm_id); */
3342         nesqp->cm_id = NULL;
3343         cm_id->provider_data = NULL;
3344         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3345         cm_event.status = IW_CM_EVENT_STATUS_REJECTED;
3346         cm_event.provider_data = cm_id->provider_data;
3347         cm_event.local_addr = cm_id->local_addr;
3348         cm_event.remote_addr = cm_id->remote_addr;
3349         cm_event.private_data = NULL;
3350         cm_event.private_data_len = 0;
3351
3352         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3353                 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3354                 cm_event.remote_addr.sin_addr.s_addr);
3355
3356         ret = cm_id->event_handler(cm_id, &cm_event);
3357         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3358         if (ret)
3359                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3360                         "ret=%d\n", __func__, __LINE__, ret);
3361         cm_id->rem_ref(cm_id);
3362
3363         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3364         return;
3365 }
3366
3367
3368 /**
3369  * cm_event_reset
3370  */
3371 static void cm_event_reset(struct nes_cm_event *event)
3372 {
3373         struct nes_qp *nesqp;
3374         struct iw_cm_id *cm_id;
3375         struct iw_cm_event cm_event;
3376         /* struct nes_cm_info cm_info; */
3377         int ret;
3378
3379         if (!event->cm_node)
3380                 return;
3381
3382         if (!event->cm_node->cm_id)
3383                 return;
3384
3385         cm_id = event->cm_node->cm_id;
3386
3387         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3388         nesqp = cm_id->provider_data;
3389
3390         nesqp->cm_id = NULL;
3391         /* cm_id->provider_data = NULL; */
3392         cm_event.event = IW_CM_EVENT_DISCONNECT;
3393         cm_event.status = IW_CM_EVENT_STATUS_RESET;
3394         cm_event.provider_data = cm_id->provider_data;
3395         cm_event.local_addr = cm_id->local_addr;
3396         cm_event.remote_addr = cm_id->remote_addr;
3397         cm_event.private_data = NULL;
3398         cm_event.private_data_len = 0;
3399
3400         ret = cm_id->event_handler(cm_id, &cm_event);
3401         cm_id->add_ref(cm_id);
3402         atomic_inc(&cm_closes);
3403         cm_event.event = IW_CM_EVENT_CLOSE;
3404         cm_event.status = IW_CM_EVENT_STATUS_OK;
3405         cm_event.provider_data = cm_id->provider_data;
3406         cm_event.local_addr = cm_id->local_addr;
3407         cm_event.remote_addr = cm_id->remote_addr;
3408         cm_event.private_data = NULL;
3409         cm_event.private_data_len = 0;
3410         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3411         ret = cm_id->event_handler(cm_id, &cm_event);
3412
3413         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3414
3415
3416         /* notify OF layer about this connection error event */
3417         cm_id->rem_ref(cm_id);
3418
3419         return;
3420 }
3421
3422
3423 /**
3424  * cm_event_mpa_req
3425  */
3426 static void cm_event_mpa_req(struct nes_cm_event *event)
3427 {
3428         struct iw_cm_id   *cm_id;
3429         struct iw_cm_event cm_event;
3430         int ret;
3431         struct nes_cm_node *cm_node;
3432
3433         cm_node = event->cm_node;
3434         if (!cm_node)
3435                 return;
3436         cm_id = cm_node->cm_id;
3437
3438         atomic_inc(&cm_connect_reqs);
3439         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3440                         cm_node, cm_id, jiffies);
3441
3442         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3443         cm_event.status = IW_CM_EVENT_STATUS_OK;
3444         cm_event.provider_data = (void *)cm_node;
3445
3446         cm_event.local_addr.sin_family = AF_INET;
3447         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3448         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3449
3450         cm_event.remote_addr.sin_family = AF_INET;
3451         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3452         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3453         cm_event.private_data = cm_node->mpa_frame_buf;
3454         cm_event.private_data_len  = (u8) cm_node->mpa_frame_size;
3455
3456         ret = cm_id->event_handler(cm_id, &cm_event);
3457         if (ret)
3458                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3459                                 __func__, __LINE__, ret);
3460         return;
3461 }
3462
3463
3464 static void cm_event_mpa_reject(struct nes_cm_event *event)
3465 {
3466         struct iw_cm_id   *cm_id;
3467         struct iw_cm_event cm_event;
3468         struct nes_cm_node *cm_node;
3469         int ret;
3470
3471         cm_node = event->cm_node;
3472         if (!cm_node)
3473                 return;
3474         cm_id = cm_node->cm_id;
3475
3476         atomic_inc(&cm_connect_reqs);
3477         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3478                         cm_node, cm_id, jiffies);
3479
3480         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3481         cm_event.status = -ECONNREFUSED;
3482         cm_event.provider_data = cm_id->provider_data;
3483
3484         cm_event.local_addr.sin_family = AF_INET;
3485         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3486         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3487
3488         cm_event.remote_addr.sin_family = AF_INET;
3489         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3490         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3491
3492         cm_event.private_data = cm_node->mpa_frame_buf;
3493         cm_event.private_data_len = (u8) cm_node->mpa_frame_size;
3494
3495         nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3496                         "remove_addr=%08x\n",
3497                         cm_event.local_addr.sin_addr.s_addr,
3498                         cm_event.remote_addr.sin_addr.s_addr);
3499
3500         ret = cm_id->event_handler(cm_id, &cm_event);
3501         if (ret)
3502                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3503                                 __func__, __LINE__, ret);
3504
3505         return;
3506 }
3507
3508
3509 static void nes_cm_event_handler(struct work_struct *);
3510
3511 /**
3512  * nes_cm_post_event
3513  * post an event to the cm event handler
3514  */
3515 static int nes_cm_post_event(struct nes_cm_event *event)
3516 {
3517         atomic_inc(&event->cm_node->cm_core->events_posted);
3518         add_ref_cm_node(event->cm_node);
3519         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3520         INIT_WORK(&event->event_work, nes_cm_event_handler);
3521         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3522                 event->cm_node, event);
3523
3524         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3525
3526         nes_debug(NES_DBG_CM, "Exit\n");
3527         return 0;
3528 }
3529
3530
3531 /**
3532  * nes_cm_event_handler
3533  * worker function to handle cm events
3534  * will free instance of nes_cm_event
3535  */
3536 static void nes_cm_event_handler(struct work_struct *work)
3537 {
3538         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3539                         event_work);
3540         struct nes_cm_core *cm_core;
3541
3542         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3543                 return;
3544
3545         cm_core = event->cm_node->cm_core;
3546         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3547                 event, event->type, atomic_read(&cm_core->events_posted));
3548
3549         switch (event->type) {
3550         case NES_CM_EVENT_MPA_REQ:
3551                 cm_event_mpa_req(event);
3552                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3553                         event->cm_node);
3554                 break;
3555         case NES_CM_EVENT_RESET:
3556                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3557                         event->cm_node);
3558                 cm_event_reset(event);
3559                 break;
3560         case NES_CM_EVENT_CONNECTED:
3561                 if ((!event->cm_node->cm_id) ||
3562                         (event->cm_node->state != NES_CM_STATE_TSA))
3563                         break;
3564                 cm_event_connected(event);
3565                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3566                 break;
3567         case NES_CM_EVENT_MPA_REJECT:
3568                 if ((!event->cm_node->cm_id) ||
3569                                 (event->cm_node->state == NES_CM_STATE_TSA))
3570                         break;
3571                 cm_event_mpa_reject(event);
3572                 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3573                 break;
3574
3575         case NES_CM_EVENT_ABORTED:
3576                 if ((!event->cm_node->cm_id) ||
3577                         (event->cm_node->state == NES_CM_STATE_TSA))
3578                         break;
3579                 cm_event_connect_error(event);
3580                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3581                 break;
3582         case NES_CM_EVENT_DROPPED_PKT:
3583                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3584                 break;
3585         default:
3586                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3587                 break;
3588         }
3589
3590         atomic_dec(&cm_core->events_posted);
3591         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3592         rem_ref_cm_node(cm_core, event->cm_node);
3593         kfree(event);
3594
3595         return;
3596 }