drivers/infiniband/hw/nes/nes_cm.c

   1 /*
   2  * Copyright (c) 2006 - 2009 Intel-NE, Inc.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34
  35 #define TCPOPT_TIMESTAMP 8
  36
  37 #include <asm/atomic.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/ip.h>
  40 #include <linux/tcp.h>
  41 #include <linux/init.h>
  42 #include <linux/if_arp.h>
  43 #include <linux/if_vlan.h>
  44 #include <linux/notifier.h>
  45 #include <linux/net.h>
  46 #include <linux/types.h>
  47 #include <linux/timer.h>
  48 #include <linux/time.h>
  49 #include <linux/delay.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/random.h>
  53 #include <linux/list.h>
  54 #include <linux/threads.h>
  55 #include <net/arp.h>
  56 #include <net/neighbour.h>
  57 #include <net/route.h>
  58 #include <net/ip_fib.h>
  59 #include <net/tcp.h>
  60
  61 #include "nes.h"
  62
  63 u32 cm_packets_sent;
  64 u32 cm_packets_bounced;
  65 u32 cm_packets_dropped;
  66 u32 cm_packets_retrans;
  67 u32 cm_packets_created;
  68 u32 cm_packets_received;
  69 u32 cm_listens_created;
  70 u32 cm_listens_destroyed;
  71 u32 cm_backlog_drops;
  72 atomic_t cm_loopbacks;
  73 atomic_t cm_nodes_created;
  74 atomic_t cm_nodes_destroyed;
  75 atomic_t cm_accel_dropped_pkts;
  76 atomic_t cm_resets_recvd;
  77
  78 static inline int mini_cm_accelerated(struct nes_cm_core *,
  79         struct nes_cm_node *);
  80 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
  81         struct nes_vnic *, struct nes_cm_info *);
  82 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
  83 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *,
  84         struct nes_vnic *, u16, void *, struct nes_cm_info *);
  85 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
  86 static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
  87         struct nes_cm_node *);
  88 static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
  89         struct nes_cm_node *);
  90 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *,
  91         struct sk_buff *);
  92 static int mini_cm_dealloc_core(struct nes_cm_core *);
  93 static int mini_cm_get(struct nes_cm_core *);
  94 static int mini_cm_set(struct nes_cm_core *, u32, u32);
  95
  96 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *,
  97         void *, u32, void *, u32, u8);
  98 static int add_ref_cm_node(struct nes_cm_node *);
  99 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
 100
 101 static int nes_cm_disconn_true(struct nes_qp *);
 102 static int nes_cm_post_event(struct nes_cm_event *event);
 103 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
 104 static void nes_disconnect_worker(struct work_struct *work);
 105
 106 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
 107 static int send_mpa_reject(struct nes_cm_node *);
 108 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
 109 static int send_reset(struct nes_cm_node *, struct sk_buff *);
 110 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
 111 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
 112 static void process_packet(struct nes_cm_node *, struct sk_buff *,
 113         struct nes_cm_core *);
 114
 115 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
 116 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
 117 static void cleanup_retrans_entry(struct nes_cm_node *);
 118 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
 119 static void free_retrans_entry(struct nes_cm_node *cm_node);
 120 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
 121         struct sk_buff *skb, int optionsize, int passive);
 122
 123 /* CM event handler functions */
 124 static void cm_event_connected(struct nes_cm_event *);
 125 static void cm_event_connect_error(struct nes_cm_event *);
 126 static void cm_event_reset(struct nes_cm_event *);
 127 static void cm_event_mpa_req(struct nes_cm_event *);
 128 static void cm_event_mpa_reject(struct nes_cm_event *);
 129 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
 130
 131 static void print_core(struct nes_cm_core *core);
 132
 133 /* External CM API Interface */
 134 /* instance of function pointers for client API */
 135 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
 136 static struct nes_cm_ops nes_cm_api = {
 137         mini_cm_accelerated,
 138         mini_cm_listen,
 139         mini_cm_del_listen,
 140         mini_cm_connect,
 141         mini_cm_close,
 142         mini_cm_accept,
 143         mini_cm_reject,
 144         mini_cm_recv_pkt,
 145         mini_cm_dealloc_core,
 146         mini_cm_get,
 147         mini_cm_set
 148 };
 149
 150 static struct nes_cm_core *g_cm_core;
 151
 152 atomic_t cm_connects;
 153 atomic_t cm_accepts;
 154 atomic_t cm_disconnects;
 155 atomic_t cm_closes;
 156 atomic_t cm_connecteds;
 157 atomic_t cm_connect_reqs;
 158 atomic_t cm_rejects;
 159
 160
 161 /**
 162  * create_event
 163  */
 164 static struct nes_cm_event *create_event(struct nes_cm_node *cm_node,
 165                 enum nes_cm_event_type type)
 166 {
 167         struct nes_cm_event *event;
 168
 169         if (!cm_node->cm_id)
 170                 return NULL;
 171
 172         /* allocate an empty event */
 173         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 174
 175         if (!event)
 176                 return NULL;
 177
 178         event->type = type;
 179         event->cm_node = cm_node;
 180         event->cm_info.rem_addr = cm_node->rem_addr;
 181         event->cm_info.loc_addr = cm_node->loc_addr;
 182         event->cm_info.rem_port = cm_node->rem_port;
 183         event->cm_info.loc_port = cm_node->loc_port;
 184         event->cm_info.cm_id = cm_node->cm_id;
 185
 186         nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
 187                 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
 188                 cm_node, event, type, event->cm_info.loc_addr,
 189                 event->cm_info.loc_port, event->cm_info.rem_addr,
 190                 event->cm_info.rem_port);
 191
 192         nes_cm_post_event(event);
 193         return event;
 194 }
 195
 196
 197 /**
 198  * send_mpa_request
 199  */
 200 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
 201 {
 202         if (!skb) {
 203                 nes_debug(NES_DBG_CM, "skb set to NULL\n");
 204                 return -1;
 205         }
 206
 207         /* send an MPA Request frame */
 208         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 209                         cm_node->mpa_frame_size, SET_ACK);
 210
 211         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 212 }
 213
 214
 215
 216 static int send_mpa_reject(struct nes_cm_node *cm_node)
 217 {
 218         struct sk_buff  *skb = NULL;
 219
 220         skb = dev_alloc_skb(MAX_CM_BUFFER);
 221         if (!skb) {
 222                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 223                 return -ENOMEM;
 224         }
 225
 226         /* send an MPA reject frame */
 227         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 228                         cm_node->mpa_frame_size, SET_ACK | SET_FIN);
 229
 230         cm_node->state = NES_CM_STATE_FIN_WAIT1;
 231         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 232 }
 233
 234
 235 /**
 236  * recv_mpa - process a received TCP pkt, we are expecting an
 237  * IETF MPA frame
 238  */
 239 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
 240                 u32 len)
 241 {
 242         struct ietf_mpa_frame *mpa_frame;
 243
 244         *type = NES_MPA_REQUEST_ACCEPT;
 245
 246         /* assume req frame is in tcp data payload */
 247         if (len < sizeof(struct ietf_mpa_frame)) {
 248                 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
 249                 return -EINVAL;
 250         }
 251
 252         mpa_frame = (struct ietf_mpa_frame *)buffer;
 253         cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
 254
 255         if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
 256                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
 257                                 " complete (%x + %x != %x)\n",
 258                                 cm_node->mpa_frame_size,
 259                                 (u32)sizeof(struct ietf_mpa_frame), len);
 260                 return -EINVAL;
 261         }
 262         /* make sure it does not exceed the max size */
 263         if (len > MAX_CM_BUFFER) {
 264                 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
 265                                 " (%x + %x != %x)\n",
 266                                 cm_node->mpa_frame_size,
 267                                 (u32)sizeof(struct ietf_mpa_frame), len);
 268                 return -EINVAL;
 269         }
 270
 271         /* copy entire MPA frame to our cm_node's frame */
 272         memcpy(cm_node->mpa_frame_buf, buffer + sizeof(struct ietf_mpa_frame),
 273                         cm_node->mpa_frame_size);
 274
 275         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
 276                 *type = NES_MPA_REQUEST_REJECT;
 277         return 0;
 278 }
 279
 280
 281 /**
 282  * form_cm_frame - get a free packet and build empty frame Use
 283  * node info to build.
 284  */
 285 static void form_cm_frame(struct sk_buff *skb,
 286         struct nes_cm_node *cm_node, void *options, u32 optionsize,
 287         void *data, u32 datasize, u8 flags)
 288 {
 289         struct tcphdr *tcph;
 290         struct iphdr *iph;
 291         struct ethhdr *ethh;
 292         u8 *buf;
 293         u16 packetsize = sizeof(*iph);
 294
 295         packetsize += sizeof(*tcph);
 296         packetsize +=  optionsize + datasize;
 297
 298         memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
 299
 300         skb->len = 0;
 301         buf = skb_put(skb, packetsize + ETH_HLEN);
 302
 303         ethh = (struct ethhdr *) buf;
 304         buf += ETH_HLEN;
 305
 306         iph = (struct iphdr *)buf;
 307         buf += sizeof(*iph);
 308         tcph = (struct tcphdr *)buf;
 309         skb_reset_mac_header(skb);
 310         skb_set_network_header(skb, ETH_HLEN);
 311         skb_set_transport_header(skb, ETH_HLEN+sizeof(*iph));
 312         buf += sizeof(*tcph);
 313
 314         skb->ip_summed = CHECKSUM_PARTIAL;
 315         skb->protocol = htons(0x800);
 316         skb->data_len = 0;
 317         skb->mac_len = ETH_HLEN;
 318
 319         memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
 320         memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
 321         ethh->h_proto = htons(0x0800);
 322
 323         iph->version = IPVERSION;
 324         iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
 325         iph->tos = 0;
 326         iph->tot_len = htons(packetsize);
 327         iph->id = htons(++cm_node->tcp_cntxt.loc_id);
 328
 329         iph->frag_off = htons(0x4000);
 330         iph->ttl = 0x40;
 331         iph->protocol = 0x06;   /* IPPROTO_TCP */
 332
 333         iph->saddr = htonl(cm_node->loc_addr);
 334         iph->daddr = htonl(cm_node->rem_addr);
 335
 336         tcph->source = htons(cm_node->loc_port);
 337         tcph->dest = htons(cm_node->rem_port);
 338         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
 339
 340         if (flags & SET_ACK) {
 341                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
 342                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
 343                 tcph->ack = 1;
 344         } else
 345                 tcph->ack_seq = 0;
 346
 347         if (flags & SET_SYN) {
 348                 cm_node->tcp_cntxt.loc_seq_num++;
 349                 tcph->syn = 1;
 350         } else
 351                 cm_node->tcp_cntxt.loc_seq_num += datasize;
 352
 353         if (flags & SET_FIN) {
 354                 cm_node->tcp_cntxt.loc_seq_num++;
 355                 tcph->fin = 1;
 356         }
 357
 358         if (flags & SET_RST)
 359                 tcph->rst = 1;
 360
 361         tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
 362         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
 363         tcph->urg_ptr = 0;
 364         if (optionsize)
 365                 memcpy(buf, options, optionsize);
 366         buf += optionsize;
 367         if (datasize)
 368                 memcpy(buf, data, datasize);
 369
 370         skb_shinfo(skb)->nr_frags = 0;
 371         cm_packets_created++;
 372
 373 }
 374
 375
 376 /**
 377  * print_core - dump a cm core
 378  */
 379 static void print_core(struct nes_cm_core *core)
 380 {
 381         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 382         nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
 383         if (!core)
 384                 return;
 385         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 386
 387         nes_debug(NES_DBG_CM, "State         : %u \n",  core->state);
 388
 389         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
 390         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
 391
 392         nes_debug(NES_DBG_CM, "core          : %p \n", core);
 393
 394         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
 395 }
 396
 397
 398 /**
 399  * schedule_nes_timer
 400  * note - cm_node needs to be protected before calling this. Encase in:
 401  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 402  */
 403 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
 404                 enum nes_timer_type type, int send_retrans,
 405                 int close_when_complete)
 406 {
 407         unsigned long  flags;
 408         struct nes_cm_core *cm_core = cm_node->cm_core;
 409         struct nes_timer_entry *new_send;
 410         int ret = 0;
 411         u32 was_timer_set;
 412
 413         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
 414         if (!new_send)
 415                 return -ENOMEM;
 416
 417         /* new_send->timetosend = currenttime */
 418         new_send->retrycount = NES_DEFAULT_RETRYS;
 419         new_send->retranscount = NES_DEFAULT_RETRANS;
 420         new_send->skb = skb;
 421         new_send->timetosend = jiffies;
 422         new_send->type = type;
 423         new_send->netdev = cm_node->netdev;
 424         new_send->send_retrans = send_retrans;
 425         new_send->close_when_complete = close_when_complete;
 426
 427         if (type == NES_TIMER_TYPE_CLOSE) {
 428                 new_send->timetosend += (HZ/10);
 429                 if (cm_node->recv_entry) {
 430                         kfree(new_send);
 431                         WARN_ON(1);
 432                         return -EINVAL;
 433                 }
 434                 cm_node->recv_entry = new_send;
 435         }
 436
 437         if (type == NES_TIMER_TYPE_SEND) {
 438                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 439                 atomic_inc(&new_send->skb->users);
 440                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 441                 cm_node->send_entry = new_send;
 442                 add_ref_cm_node(cm_node);
 443                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 444                 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
 445
 446                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
 447                 if (ret != NETDEV_TX_OK) {
 448                         nes_debug(NES_DBG_CM, "Error sending packet %p "
 449                                 "(jiffies = %lu)\n", new_send, jiffies);
 450                         new_send->timetosend = jiffies;
 451                         ret = NETDEV_TX_OK;
 452                 } else {
 453                         cm_packets_sent++;
 454                         if (!send_retrans) {
 455                                 cleanup_retrans_entry(cm_node);
 456                                 if (close_when_complete)
 457                                         rem_ref_cm_node(cm_core, cm_node);
 458                                 return ret;
 459                         }
 460                 }
 461         }
 462
 463         was_timer_set = timer_pending(&cm_core->tcp_timer);
 464
 465         if (!was_timer_set) {
 466                 cm_core->tcp_timer.expires = new_send->timetosend;
 467                 add_timer(&cm_core->tcp_timer);
 468         }
 469
 470         return ret;
 471 }
 472
 473 static void nes_retrans_expired(struct nes_cm_node *cm_node)
 474 {
 475         struct iw_cm_id *cm_id = cm_node->cm_id;
 476         switch (cm_node->state) {
 477         case NES_CM_STATE_SYN_RCVD:
 478         case NES_CM_STATE_CLOSING:
 479                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 480                 break;
 481         case NES_CM_STATE_LAST_ACK:
 482         case NES_CM_STATE_FIN_WAIT1:
 483                 if (cm_node->cm_id)
 484                         cm_id->rem_ref(cm_id);
 485                 cm_node->state = NES_CM_STATE_CLOSED;
 486                 send_reset(cm_node, NULL);
 487                 break;
 488         default:
 489                 create_event(cm_node, NES_CM_EVENT_ABORTED);
 490         }
 491 }
 492
 493 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
 494 {
 495         struct nes_timer_entry *recv_entry = cm_node->recv_entry;
 496         struct iw_cm_id *cm_id = cm_node->cm_id;
 497         struct nes_qp *nesqp;
 498         unsigned long qplockflags;
 499
 500         if (!recv_entry)
 501                 return;
 502         nesqp = (struct nes_qp *)recv_entry->skb;
 503         if (nesqp) {
 504                 spin_lock_irqsave(&nesqp->lock, qplockflags);
 505                 if (nesqp->cm_id) {
 506                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 507                                 "refcount = %d: HIT A "
 508                                 "NES_TIMER_TYPE_CLOSE with something "
 509                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 510                                 atomic_read(&nesqp->refcount));
 511                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
 512                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
 513                         nesqp->ibqp_state = IB_QPS_ERR;
 514                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 515                         nes_cm_disconn(nesqp);
 516                 } else {
 517                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 518                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 519                                 "refcount = %d: HIT A "
 520                                 "NES_TIMER_TYPE_CLOSE with nothing "
 521                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 522                                 atomic_read(&nesqp->refcount));
 523                 }
 524         } else if (rem_node) {
 525                 /* TIME_WAIT state */
 526                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 527         }
 528         if (cm_node->cm_id)
 529                 cm_id->rem_ref(cm_id);
 530         kfree(recv_entry);
 531         cm_node->recv_entry = NULL;
 532 }
 533
 534 /**
 535  * nes_cm_timer_tick
 536  */
 537 static void nes_cm_timer_tick(unsigned long pass)
 538 {
 539         unsigned long flags;
 540         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
 541         struct nes_cm_node *cm_node;
 542         struct nes_timer_entry *send_entry, *recv_entry;
 543         struct list_head *list_core_temp;
 544         struct list_head *list_node;
 545         struct nes_cm_core *cm_core = g_cm_core;
 546         u32 settimer = 0;
 547         unsigned long timetosend;
 548         int ret = NETDEV_TX_OK;
 549
 550         struct list_head timer_list;
 551         INIT_LIST_HEAD(&timer_list);
 552         spin_lock_irqsave(&cm_core->ht_lock, flags);
 553
 554         list_for_each_safe(list_node, list_core_temp,
 555                                 &cm_core->connected_nodes) {
 556                 cm_node = container_of(list_node, struct nes_cm_node, list);
 557                 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
 558                         add_ref_cm_node(cm_node);
 559                         list_add(&cm_node->timer_entry, &timer_list);
 560                 }
 561         }
 562         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 563
 564         list_for_each_safe(list_node, list_core_temp, &timer_list) {
 565                 cm_node = container_of(list_node, struct nes_cm_node,
 566                                         timer_entry);
 567                 recv_entry = cm_node->recv_entry;
 568
 569                 if (recv_entry) {
 570                         if (time_after(recv_entry->timetosend, jiffies)) {
 571                                 if (nexttimeout > recv_entry->timetosend ||
 572                                                 !settimer) {
 573                                         nexttimeout = recv_entry->timetosend;
 574                                         settimer = 1;
 575                                 }
 576                         } else
 577                                 handle_recv_entry(cm_node, 1);
 578                 }
 579
 580                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 581                 do {
 582                         send_entry = cm_node->send_entry;
 583                         if (!send_entry)
 584                                 break;
 585                         if (time_after(send_entry->timetosend, jiffies)) {
 586                                 if (cm_node->state != NES_CM_STATE_TSA) {
 587                                         if ((nexttimeout >
 588                                                 send_entry->timetosend) ||
 589                                                 !settimer) {
 590                                                 nexttimeout =
 591                                                         send_entry->timetosend;
 592                                                 settimer = 1;
 593                                         }
 594                                 } else {
 595                                         free_retrans_entry(cm_node);
 596                                 }
 597                                 break;
 598                         }
 599
 600                         if ((cm_node->state == NES_CM_STATE_TSA) ||
 601                                 (cm_node->state == NES_CM_STATE_CLOSED)) {
 602                                 free_retrans_entry(cm_node);
 603                                 break;
 604                         }
 605
 606                         if (!send_entry->retranscount ||
 607                                 !send_entry->retrycount) {
 608                                 cm_packets_dropped++;
 609                                 free_retrans_entry(cm_node);
 610
 611                                 spin_unlock_irqrestore(
 612                                         &cm_node->retrans_list_lock, flags);
 613                                 nes_retrans_expired(cm_node);
 614                                 cm_node->state = NES_CM_STATE_CLOSED;
 615                                 spin_lock_irqsave(&cm_node->retrans_list_lock,
 616                                         flags);
 617                                 break;
 618                         }
 619                         atomic_inc(&send_entry->skb->users);
 620                         cm_packets_retrans++;
 621                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
 622                                 "for node %p, jiffies = %lu, time to send = "
 623                                 "%lu, retranscount = %u, send_entry->seq_num = "
 624                                 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
 625                                 "0x%08X\n", send_entry, cm_node, jiffies,
 626                                 send_entry->timetosend,
 627                                 send_entry->retranscount,
 628                                 send_entry->seq_num,
 629                                 cm_node->tcp_cntxt.rem_ack_num);
 630
 631                         spin_unlock_irqrestore(&cm_node->retrans_list_lock,
 632                                 flags);
 633                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
 634                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 635                         if (ret != NETDEV_TX_OK) {
 636                                 nes_debug(NES_DBG_CM, "rexmit failed for "
 637                                         "node=%p\n", cm_node);
 638                                 cm_packets_bounced++;
 639                                 send_entry->retrycount--;
 640                                 nexttimeout = jiffies + NES_SHORT_TIME;
 641                                 settimer = 1;
 642                                 break;
 643                         } else {
 644                                 cm_packets_sent++;
 645                         }
 646                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
 647                                 "%u, retry count = %u.\n",
 648                                 send_entry->retranscount,
 649                                 send_entry->retrycount);
 650                         if (send_entry->send_retrans) {
 651                                 send_entry->retranscount--;
 652                                 timetosend = (NES_RETRY_TIMEOUT <<
 653                                         (NES_DEFAULT_RETRANS - send_entry->retranscount));
 654
 655                                 send_entry->timetosend = jiffies +
 656                                         min(timetosend, NES_MAX_TIMEOUT);
 657                                 if (nexttimeout > send_entry->timetosend ||
 658                                         !settimer) {
 659                                         nexttimeout = send_entry->timetosend;
 660                                         settimer = 1;
 661                                 }
 662                         } else {
 663                                 int close_when_complete;
 664                                 close_when_complete =
 665                                         send_entry->close_when_complete;
 666                                 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
 667                                         cm_node, cm_node->state);
 668                                 free_retrans_entry(cm_node);
 669                                 if (close_when_complete)
 670                                         rem_ref_cm_node(cm_node->cm_core,
 671                                                 cm_node);
 672                         }
 673                 } while (0);
 674
 675                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 676                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 677         }
 678
 679         if (settimer) {
 680                 if (!timer_pending(&cm_core->tcp_timer)) {
 681                         cm_core->tcp_timer.expires  = nexttimeout;
 682                         add_timer(&cm_core->tcp_timer);
 683                 }
 684         }
 685 }
 686
 687
 688 /**
 689  * send_syn
 690  */
 691 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
 692         struct sk_buff *skb)
 693 {
 694         int ret;
 695         int flags = SET_SYN;
 696         char optionsbuffer[sizeof(struct option_mss) +
 697                 sizeof(struct option_windowscale) + sizeof(struct option_base) +
 698                 TCP_OPTIONS_PADDING];
 699
 700         int optionssize = 0;
 701         /* Sending MSS option */
 702         union all_known_options *options;
 703
 704         if (!cm_node)
 705                 return -EINVAL;
 706
 707         options = (union all_known_options *)&optionsbuffer[optionssize];
 708         options->as_mss.optionnum = OPTION_NUMBER_MSS;
 709         options->as_mss.length = sizeof(struct option_mss);
 710         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
 711         optionssize += sizeof(struct option_mss);
 712
 713         options = (union all_known_options *)&optionsbuffer[optionssize];
 714         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
 715         options->as_windowscale.length = sizeof(struct option_windowscale);
 716         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
 717         optionssize += sizeof(struct option_windowscale);
 718
 719         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
 720                 options = (union all_known_options *)&optionsbuffer[optionssize];
 721                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
 722                 options->as_base.length = sizeof(struct option_base);
 723                 optionssize += sizeof(struct option_base);
 724                 /* we need the size to be a multiple of 4 */
 725                 options = (union all_known_options *)&optionsbuffer[optionssize];
 726                 options->as_end = 1;
 727                 optionssize += 1;
 728                 options = (union all_known_options *)&optionsbuffer[optionssize];
 729                 options->as_end = 1;
 730                 optionssize += 1;
 731         }
 732
 733         options = (union all_known_options *)&optionsbuffer[optionssize];
 734         options->as_end = OPTION_NUMBER_END;
 735         optionssize += 1;
 736
 737         if (!skb)
 738                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 739         if (!skb) {
 740                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 741                 return -1;
 742         }
 743
 744         if (sendack)
 745                 flags |= SET_ACK;
 746
 747         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
 748         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 749
 750         return ret;
 751 }
 752
 753
 754 /**
 755  * send_reset
 756  */
 757 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
 758 {
 759         int ret;
 760         int flags = SET_RST | SET_ACK;
 761
 762         if (!skb)
 763                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 764         if (!skb) {
 765                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 766                 return -ENOMEM;
 767         }
 768
 769         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
 770         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
 771
 772         return ret;
 773 }
 774
 775
 776 /**
 777  * send_ack
 778  */
 779 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
 780 {
 781         int ret;
 782
 783         if (!skb)
 784                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 785
 786         if (!skb) {
 787                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 788                 return -1;
 789         }
 790
 791         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
 792         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
 793
 794         return ret;
 795 }
 796
 797
 798 /**
 799  * send_fin
 800  */
 801 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
 802 {
 803         int ret;
 804
 805         /* if we didn't get a frame get one */
 806         if (!skb)
 807                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 808
 809         if (!skb) {
 810                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 811                 return -1;
 812         }
 813
 814         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
 815         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 816
 817         return ret;
 818 }
 819
 820
 821 /**
 822  * find_node - find a cm node that matches the reference cm node
 823  */
 824 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
 825                 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
 826 {
 827         unsigned long flags;
 828         struct list_head *hte;
 829         struct nes_cm_node *cm_node;
 830
 831         /* get a handle on the hte */
 832         hte = &cm_core->connected_nodes;
 833
 834         /* walk list and find cm_node associated with this session ID */
 835         spin_lock_irqsave(&cm_core->ht_lock, flags);
 836         list_for_each_entry(cm_node, hte, list) {
 837                 /* compare quad, return node handle if a match */
 838                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
 839                                 cm_node->loc_addr, cm_node->loc_port,
 840                                 loc_addr, loc_port,
 841                                 cm_node->rem_addr, cm_node->rem_port,
 842                                 rem_addr, rem_port);
 843                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
 844                                 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
 845                         add_ref_cm_node(cm_node);
 846                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 847                         return cm_node;
 848                 }
 849         }
 850         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 851
 852         /* no owner node */
 853         return NULL;
 854 }
 855
 856
 857 /**
 858  * find_listener - find a cm node listening on this addr-port pair
 859  */
 860 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
 861                 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
 862 {
 863         unsigned long flags;
 864         struct nes_cm_listener *listen_node;
 865
 866         /* walk list and find cm_node associated with this session ID */
 867         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 868         list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
 869                 /* compare node pair, return node handle if a match */
 870                 if (((listen_node->loc_addr == dst_addr) ||
 871                                 listen_node->loc_addr == 0x00000000) &&
 872                                 (listen_node->loc_port == dst_port) &&
 873                                 (listener_state & listen_node->listener_state)) {
 874                         atomic_inc(&listen_node->ref_count);
 875                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 876                         return listen_node;
 877                 }
 878         }
 879         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 880
 881         /* no listener */
 882         return NULL;
 883 }
 884
 885
 886 /**
 887  * add_hte_node - add a cm node to the hash table
 888  */
 889 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
 890 {
 891         unsigned long flags;
 892         struct list_head *hte;
 893
 894         if (!cm_node || !cm_core)
 895                 return -EINVAL;
 896
 897         nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
 898                 cm_node);
 899
 900         spin_lock_irqsave(&cm_core->ht_lock, flags);
 901
 902         /* get a handle on the hash table element (list head for this slot) */
 903         hte = &cm_core->connected_nodes;
 904         list_add_tail(&cm_node->list, hte);
 905         atomic_inc(&cm_core->ht_node_cnt);
 906
 907         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 908
 909         return 0;
 910 }
 911
 912
 913 /**
 914  * mini_cm_dec_refcnt_listen
 915  */
 916 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
 917         struct nes_cm_listener *listener, int free_hanging_nodes)
 918 {
 919         int ret = -EINVAL;
 920         int err = 0;
 921         unsigned long flags;
 922         struct list_head *list_pos = NULL;
 923         struct list_head *list_temp = NULL;
 924         struct nes_cm_node *cm_node = NULL;
 925         struct list_head reset_list;
 926
 927         nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
 928                 "refcnt=%d\n", listener, free_hanging_nodes,
 929                 atomic_read(&listener->ref_count));
 930         /* free non-accelerated child nodes for this listener */
 931         INIT_LIST_HEAD(&reset_list);
 932         if (free_hanging_nodes) {
 933                 spin_lock_irqsave(&cm_core->ht_lock, flags);
 934                 list_for_each_safe(list_pos, list_temp,
 935                                    &g_cm_core->connected_nodes) {
 936                         cm_node = container_of(list_pos, struct nes_cm_node,
 937                                 list);
 938                         if ((cm_node->listener == listener) &&
 939                             (!cm_node->accelerated)) {
 940                                 add_ref_cm_node(cm_node);
 941                                 list_add(&cm_node->reset_entry, &reset_list);
 942                         }
 943                 }
 944                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 945         }
 946
 947         list_for_each_safe(list_pos, list_temp, &reset_list) {
 948                 cm_node = container_of(list_pos, struct nes_cm_node,
 949                                 reset_entry);
 950                 {
 951                         struct nes_cm_node *loopback = cm_node->loopbackpartner;
 952                         if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
 953                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 954                         } else {
 955                                 if (!loopback) {
 956                                         cleanup_retrans_entry(cm_node);
 957                                         err = send_reset(cm_node, NULL);
 958                                         if (err) {
 959                                                 cm_node->state =
 960                                                          NES_CM_STATE_CLOSED;
 961                                                 WARN_ON(1);
 962                                         } else {
 963                                                 cm_node->state =
 964                                                         NES_CM_STATE_CLOSED;
 965                                                 rem_ref_cm_node(
 966                                                         cm_node->cm_core,
 967                                                         cm_node);
 968                                         }
 969                                 } else {
 970                                         struct nes_cm_event event;
 971
 972                                         event.cm_node = loopback;
 973                                         event.cm_info.rem_addr =
 974                                                         loopback->rem_addr;
 975                                         event.cm_info.loc_addr =
 976                                                         loopback->loc_addr;
 977                                         event.cm_info.rem_port =
 978                                                         loopback->rem_port;
 979                                         event.cm_info.loc_port =
 980                                                          loopback->loc_port;
 981                                         event.cm_info.cm_id = loopback->cm_id;
 982                                         cm_event_connect_error(&event);
 983                                         loopback->state = NES_CM_STATE_CLOSED;
 984
 985                                         event.cm_node = cm_node;
 986                                         event.cm_info.rem_addr =
 987                                                          cm_node->rem_addr;
 988                                         event.cm_info.loc_addr =
 989                                                          cm_node->loc_addr;
 990                                         event.cm_info.rem_port =
 991                                                          cm_node->rem_port;
 992                                         event.cm_info.loc_port =
 993                                                          cm_node->loc_port;
 994                                         event.cm_info.cm_id = cm_node->cm_id;
 995                                         cm_event_reset(&event);
 996
 997                                         rem_ref_cm_node(cm_node->cm_core,
 998                                                          cm_node);
 999
1000                                 }
1001                         }
1002                 }
1003         }
1004
1005         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1006         if (!atomic_dec_return(&listener->ref_count)) {
1007                 list_del(&listener->list);
1008
1009                 /* decrement our listen node count */
1010                 atomic_dec(&cm_core->listen_node_cnt);
1011
1012                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1013
1014                 if (listener->nesvnic) {
1015                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
1016                                         PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
1017                 }
1018
1019                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1020
1021                 kfree(listener);
1022                 listener = NULL;
1023                 ret = 0;
1024                 cm_listens_destroyed++;
1025         } else {
1026                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1027         }
1028         if (listener) {
1029                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1030                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
1031                                         " with non-zero pending accepts=%u\n",
1032                                         listener, atomic_read(&listener->pend_accepts_cnt));
1033         }
1034
1035         return ret;
1036 }
1037
1038
1039 /**
1040  * mini_cm_del_listen
1041  */
1042 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1043                 struct nes_cm_listener *listener)
1044 {
1045         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1046         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1047         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1048 }
1049
1050
1051 /**
1052  * mini_cm_accelerated
1053  */
1054 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1055                 struct nes_cm_node *cm_node)
1056 {
1057         u32 was_timer_set;
1058         cm_node->accelerated = 1;
1059
1060         if (cm_node->accept_pend) {
1061                 BUG_ON(!cm_node->listener);
1062                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1063                 cm_node->accept_pend = 0;
1064                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1065         }
1066
1067         was_timer_set = timer_pending(&cm_core->tcp_timer);
1068         if (!was_timer_set) {
1069                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1070                 add_timer(&cm_core->tcp_timer);
1071         }
1072
1073         return 0;
1074 }
1075
1076
1077 /**
1078  * nes_addr_resolve_neigh
1079  */
1080 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
1081 {
1082         struct rtable *rt;
1083         struct flowi fl;
1084         struct neighbour *neigh;
1085         int rc = -1;
1086
1087         memset(&fl, 0, sizeof fl);
1088         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1089         if (ip_route_output_key(&init_net, &rt, &fl)) {
1090                 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1091                                 __func__, dst_ip);
1092                 return rc;
1093         }
1094
1095         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, nesvnic->netdev);
1096         if (neigh) {
1097                 if (neigh->nud_state & NUD_VALID) {
1098                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1099                                   " is %pM, Gateway is 0x%08X \n", dst_ip,
1100                                   neigh->ha, ntohl(rt->rt_gateway));
1101                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1102                                              dst_ip, NES_ARP_ADD);
1103                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1104                                            NES_ARP_RESOLVE);
1105                 }
1106                 neigh_release(neigh);
1107         }
1108
1109         if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
1110                 neigh_event_send(rt->u.dst.neighbour, NULL);
1111
1112         ip_rt_put(rt);
1113         return rc;
1114 }
1115
1116
1117 /**
1118  * make_cm_node - create a new instance of a cm node
1119  */
1120 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1121                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1122                 struct nes_cm_listener *listener)
1123 {
1124         struct nes_cm_node *cm_node;
1125         struct timespec ts;
1126         int arpindex = 0;
1127         struct nes_device *nesdev;
1128         struct nes_adapter *nesadapter;
1129
1130         /* create an hte and cm_node for this instance */
1131         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1132         if (!cm_node)
1133                 return NULL;
1134
1135         /* set our node specific transport info */
1136         cm_node->loc_addr = cm_info->loc_addr;
1137         cm_node->rem_addr = cm_info->rem_addr;
1138         cm_node->loc_port = cm_info->loc_port;
1139         cm_node->rem_port = cm_info->rem_port;
1140         cm_node->send_write0 = send_first;
1141         nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1142                   &cm_node->loc_addr, cm_node->loc_port,
1143                   &cm_node->rem_addr, cm_node->rem_port);
1144         cm_node->listener = listener;
1145         cm_node->netdev = nesvnic->netdev;
1146         cm_node->cm_id = cm_info->cm_id;
1147         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1148
1149         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1150                         cm_node->cm_id);
1151
1152         spin_lock_init(&cm_node->retrans_list_lock);
1153
1154         cm_node->loopbackpartner = NULL;
1155         atomic_set(&cm_node->ref_count, 1);
1156         /* associate our parent CM core */
1157         cm_node->cm_core = cm_core;
1158         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1159         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1160         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1161                         NES_CM_DEFAULT_RCV_WND_SCALE;
1162         ts = current_kernel_time();
1163         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1164         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1165                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1166         cm_node->tcp_cntxt.rcv_nxt = 0;
1167         /* get a unique session ID , add thread_id to an upcounter to handle race */
1168         atomic_inc(&cm_core->node_cnt);
1169         cm_node->conn_type = cm_info->conn_type;
1170         cm_node->apbvt_set = 0;
1171         cm_node->accept_pend = 0;
1172
1173         cm_node->nesvnic = nesvnic;
1174         /* get some device handles, for arp lookup */
1175         nesdev = nesvnic->nesdev;
1176         nesadapter = nesdev->nesadapter;
1177
1178         cm_node->loopbackpartner = NULL;
1179         /* get the mac addr for the remote node */
1180         if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
1181                 arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1182         else
1183                 arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1184         if (arpindex < 0) {
1185                 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr);
1186                 if (arpindex < 0) {
1187                         kfree(cm_node);
1188                         return NULL;
1189                 }
1190         }
1191
1192         /* copy the mac addr to node context */
1193         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1194         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1195                   cm_node->rem_mac);
1196
1197         add_hte_node(cm_core, cm_node);
1198         atomic_inc(&cm_nodes_created);
1199
1200         return cm_node;
1201 }
1202
1203
1204 /**
1205  * add_ref_cm_node - destroy an instance of a cm node
1206  */
1207 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1208 {
1209         atomic_inc(&cm_node->ref_count);
1210         return 0;
1211 }
1212
1213
1214 /**
1215  * rem_ref_cm_node - destroy an instance of a cm node
1216  */
1217 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1218         struct nes_cm_node *cm_node)
1219 {
1220         unsigned long flags;
1221         struct nes_qp *nesqp;
1222
1223         if (!cm_node)
1224                 return -EINVAL;
1225
1226         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1227         if (atomic_dec_return(&cm_node->ref_count)) {
1228                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1229                 return 0;
1230         }
1231         list_del(&cm_node->list);
1232         atomic_dec(&cm_core->ht_node_cnt);
1233         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1234
1235         /* if the node is destroyed before connection was accelerated */
1236         if (!cm_node->accelerated && cm_node->accept_pend) {
1237                 BUG_ON(!cm_node->listener);
1238                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1239                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1240         }
1241         WARN_ON(cm_node->send_entry);
1242         if (cm_node->recv_entry)
1243                 handle_recv_entry(cm_node, 0);
1244         if (cm_node->listener) {
1245                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1246         } else {
1247                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1248                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1249                                 PCI_FUNC(
1250                                 cm_node->nesvnic->nesdev->pcidev->devfn),
1251                                 NES_MANAGE_APBVT_DEL);
1252                 }
1253         }
1254
1255         atomic_dec(&cm_core->node_cnt);
1256         atomic_inc(&cm_nodes_destroyed);
1257         nesqp = cm_node->nesqp;
1258         if (nesqp) {
1259                 nesqp->cm_node = NULL;
1260                 nes_rem_ref(&nesqp->ibqp);
1261                 cm_node->nesqp = NULL;
1262         }
1263
1264         kfree(cm_node);
1265         return 0;
1266 }
1267
1268 /**
1269  * process_options
1270  */
1271 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1272         u32 optionsize, u32 syn_packet)
1273 {
1274         u32 tmp;
1275         u32 offset = 0;
1276         union all_known_options *all_options;
1277         char got_mss_option = 0;
1278
1279         while (offset < optionsize) {
1280                 all_options = (union all_known_options *)(optionsloc + offset);
1281                 switch (all_options->as_base.optionnum) {
1282                 case OPTION_NUMBER_END:
1283                         offset = optionsize;
1284                         break;
1285                 case OPTION_NUMBER_NONE:
1286                         offset += 1;
1287                         continue;
1288                 case OPTION_NUMBER_MSS:
1289                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1290                                 "Size: %d\n", __func__,
1291                                 all_options->as_mss.length, offset, optionsize);
1292                         got_mss_option = 1;
1293                         if (all_options->as_mss.length != 4) {
1294                                 return 1;
1295                         } else {
1296                                 tmp = ntohs(all_options->as_mss.mss);
1297                                 if (tmp > 0 && tmp <
1298                                         cm_node->tcp_cntxt.mss)
1299                                         cm_node->tcp_cntxt.mss = tmp;
1300                         }
1301                         break;
1302                 case OPTION_NUMBER_WINDOW_SCALE:
1303                         cm_node->tcp_cntxt.snd_wscale =
1304                                 all_options->as_windowscale.shiftcount;
1305                         break;
1306                 case OPTION_NUMBER_WRITE0:
1307                         cm_node->send_write0 = 1;
1308                         break;
1309                 default:
1310                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1311                                 all_options->as_base.optionnum);
1312                         break;
1313                 }
1314                 offset += all_options->as_base.length;
1315         }
1316         if ((!got_mss_option) && (syn_packet))
1317                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1318         return 0;
1319 }
1320
1321 static void drop_packet(struct sk_buff *skb)
1322 {
1323         atomic_inc(&cm_accel_dropped_pkts);
1324         dev_kfree_skb_any(skb);
1325 }
1326
1327 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1328 {
1329         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1330                 "refcnt=%d\n", cm_node, cm_node->state,
1331                 atomic_read(&cm_node->ref_count));
1332         switch (cm_node->state) {
1333         case NES_CM_STATE_SYN_RCVD:
1334         case NES_CM_STATE_SYN_SENT:
1335         case NES_CM_STATE_ESTABLISHED:
1336         case NES_CM_STATE_MPAREQ_SENT:
1337         case NES_CM_STATE_MPAREJ_RCVD:
1338                 cm_node->tcp_cntxt.rcv_nxt++;
1339                 cleanup_retrans_entry(cm_node);
1340                 cm_node->state = NES_CM_STATE_LAST_ACK;
1341                 send_fin(cm_node, NULL);
1342                 break;
1343         case NES_CM_STATE_FIN_WAIT1:
1344                 cm_node->tcp_cntxt.rcv_nxt++;
1345                 cleanup_retrans_entry(cm_node);
1346                 cm_node->state = NES_CM_STATE_CLOSING;
1347                 send_ack(cm_node, NULL);
1348                 /* Wait for ACK as this is simultanous close..
1349                 * After we receive ACK, do not send anything..
1350                 * Just rm the node.. Done.. */
1351                 break;
1352         case NES_CM_STATE_FIN_WAIT2:
1353                 cm_node->tcp_cntxt.rcv_nxt++;
1354                 cleanup_retrans_entry(cm_node);
1355                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1356                 send_ack(cm_node, NULL);
1357                 schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
1358                 break;
1359         case NES_CM_STATE_TIME_WAIT:
1360                 cm_node->tcp_cntxt.rcv_nxt++;
1361                 cleanup_retrans_entry(cm_node);
1362                 cm_node->state = NES_CM_STATE_CLOSED;
1363                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1364                 break;
1365         case NES_CM_STATE_TSA:
1366         default:
1367                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1368                         cm_node, cm_node->state);
1369                 break;
1370         }
1371 }
1372
1373
1374 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1375         struct tcphdr *tcph)
1376 {
1377
1378         int     reset = 0;      /* whether to send reset in case of err.. */
1379         int     passive_state;
1380         atomic_inc(&cm_resets_recvd);
1381         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1382                         " refcnt=%d\n", cm_node, cm_node->state,
1383                         atomic_read(&cm_node->ref_count));
1384         cleanup_retrans_entry(cm_node);
1385         switch (cm_node->state) {
1386         case NES_CM_STATE_SYN_SENT:
1387         case NES_CM_STATE_MPAREQ_SENT:
1388                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1389                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1390                         cm_node->listener, cm_node->state);
1391                 active_open_err(cm_node, skb, reset);
1392                 break;
1393         case NES_CM_STATE_MPAREQ_RCVD:
1394                 passive_state = atomic_add_return(1, &cm_node->passive_state);
1395                 if (passive_state ==  NES_SEND_RESET_EVENT)
1396                         create_event(cm_node, NES_CM_EVENT_RESET);
1397                 cm_node->state = NES_CM_STATE_CLOSED;
1398                 dev_kfree_skb_any(skb);
1399                 break;
1400         case NES_CM_STATE_ESTABLISHED:
1401         case NES_CM_STATE_SYN_RCVD:
1402         case NES_CM_STATE_LISTENING:
1403                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1404                 passive_open_err(cm_node, skb, reset);
1405                 break;
1406         case NES_CM_STATE_TSA:
1407                 active_open_err(cm_node, skb, reset);
1408                 break;
1409         case NES_CM_STATE_CLOSED:
1410                 drop_packet(skb);
1411                 break;
1412         case NES_CM_STATE_FIN_WAIT1:
1413         case NES_CM_STATE_LAST_ACK:
1414                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1415         case NES_CM_STATE_TIME_WAIT:
1416                 cm_node->state = NES_CM_STATE_CLOSED;
1417                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1418                 drop_packet(skb);
1419                 break;
1420         default:
1421                 drop_packet(skb);
1422                 break;
1423         }
1424 }
1425
1426
1427 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1428 {
1429
1430         int     ret = 0;
1431         int datasize = skb->len;
1432         u8 *dataloc = skb->data;
1433
1434         enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1435         u32     res_type;
1436         ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1437         if (ret) {
1438                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1439                 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1440                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1441                                 "cm_node=%p listener=%p state=%d\n", __func__,
1442                                 __LINE__, cm_node, cm_node->listener,
1443                                 cm_node->state);
1444                         active_open_err(cm_node, skb, 1);
1445                 } else {
1446                         passive_open_err(cm_node, skb, 1);
1447                 }
1448                 return;
1449         }
1450
1451         switch (cm_node->state) {
1452         case NES_CM_STATE_ESTABLISHED:
1453                 if (res_type == NES_MPA_REQUEST_REJECT) {
1454                         /*BIG problem as we are receiving the MPA.. So should
1455                         * not be REJECT.. This is Passive Open.. We can
1456                         * only receive it Reject for Active Open...*/
1457                         WARN_ON(1);
1458                 }
1459                 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1460                 type = NES_CM_EVENT_MPA_REQ;
1461                 atomic_set(&cm_node->passive_state,
1462                                 NES_PASSIVE_STATE_INDICATED);
1463                 break;
1464         case NES_CM_STATE_MPAREQ_SENT:
1465                 cleanup_retrans_entry(cm_node);
1466                 if (res_type == NES_MPA_REQUEST_REJECT) {
1467                         type = NES_CM_EVENT_MPA_REJECT;
1468                         cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1469                 } else {
1470                         type = NES_CM_EVENT_CONNECTED;
1471                         cm_node->state = NES_CM_STATE_TSA;
1472                 }
1473
1474                 break;
1475         default:
1476                 WARN_ON(1);
1477                 break;
1478         }
1479         dev_kfree_skb_any(skb);
1480         create_event(cm_node, type);
1481 }
1482
1483 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1484 {
1485         switch (cm_node->state) {
1486         case NES_CM_STATE_SYN_SENT:
1487         case NES_CM_STATE_MPAREQ_SENT:
1488                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1489                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1490                         cm_node->listener, cm_node->state);
1491                 active_open_err(cm_node, skb, 1);
1492                 break;
1493         case NES_CM_STATE_ESTABLISHED:
1494         case NES_CM_STATE_SYN_RCVD:
1495                 passive_open_err(cm_node, skb, 1);
1496                 break;
1497         case NES_CM_STATE_TSA:
1498         default:
1499                 drop_packet(skb);
1500         }
1501 }
1502
1503 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1504         struct sk_buff *skb)
1505 {
1506         int err;
1507
1508         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1509         if (err)
1510                 active_open_err(cm_node, skb, 1);
1511
1512         return err;
1513 }
1514
1515 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1516         struct sk_buff *skb)
1517 {
1518         int err = 0;
1519         u32 seq;
1520         u32 ack_seq;
1521         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1522         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1523         u32 rcv_wnd;
1524         seq = ntohl(tcph->seq);
1525         ack_seq = ntohl(tcph->ack_seq);
1526         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1527         if (ack_seq != loc_seq_num)
1528                 err = 1;
1529         else if (!between(seq, rcv_nxt, (rcv_nxt+rcv_wnd)))
1530                 err = 1;
1531         if (err) {
1532                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1533                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1534                         cm_node->listener, cm_node->state);
1535                 indicate_pkt_err(cm_node, skb);
1536                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1537                         "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1538                         rcv_wnd);
1539         }
1540         return err;
1541 }
1542
1543 /*
1544  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1545  * is created with a listener or it may comein as rexmitted packet which in
1546  * that case will be just dropped.
1547  */
1548
1549 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1550         struct tcphdr *tcph)
1551 {
1552         int ret;
1553         u32 inc_sequence;
1554         int optionsize;
1555
1556         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1557         skb_trim(skb, 0);
1558         inc_sequence = ntohl(tcph->seq);
1559
1560         switch (cm_node->state) {
1561         case NES_CM_STATE_SYN_SENT:
1562         case NES_CM_STATE_MPAREQ_SENT:
1563                 /* Rcvd syn on active open connection*/
1564                 active_open_err(cm_node, skb, 1);
1565                 break;
1566         case NES_CM_STATE_LISTENING:
1567                 /* Passive OPEN */
1568                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1569                                 cm_node->listener->backlog) {
1570                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1571                                 "pressure \n");
1572                         cm_backlog_drops++;
1573                         passive_open_err(cm_node, skb, 0);
1574                         break;
1575                 }
1576                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1577                         1);
1578                 if (ret) {
1579                         passive_open_err(cm_node, skb, 0);
1580                         /* drop pkt */
1581                         break;
1582                 }
1583                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1584                 BUG_ON(cm_node->send_entry);
1585                 cm_node->accept_pend = 1;
1586                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1587
1588                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1589                 send_syn(cm_node, 1, skb);
1590                 break;
1591         case NES_CM_STATE_CLOSED:
1592                 cleanup_retrans_entry(cm_node);
1593                 send_reset(cm_node, skb);
1594                 break;
1595         case NES_CM_STATE_TSA:
1596         case NES_CM_STATE_ESTABLISHED:
1597         case NES_CM_STATE_FIN_WAIT1:
1598         case NES_CM_STATE_FIN_WAIT2:
1599         case NES_CM_STATE_MPAREQ_RCVD:
1600         case NES_CM_STATE_LAST_ACK:
1601         case NES_CM_STATE_CLOSING:
1602         case NES_CM_STATE_UNKNOWN:
1603         default:
1604                 drop_packet(skb);
1605                 break;
1606         }
1607 }
1608
1609 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1610         struct tcphdr *tcph)
1611 {
1612
1613         int ret;
1614         u32 inc_sequence;
1615         int optionsize;
1616
1617         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1618         skb_trim(skb, 0);
1619         inc_sequence = ntohl(tcph->seq);
1620         switch (cm_node->state) {
1621         case NES_CM_STATE_SYN_SENT:
1622                 cleanup_retrans_entry(cm_node);
1623                 /* active open */
1624                 if (check_syn(cm_node, tcph, skb))
1625                         return;
1626                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1627                 /* setup options */
1628                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1629                 if (ret) {
1630                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1631                                 cm_node);
1632                         break;
1633                 }
1634                 cleanup_retrans_entry(cm_node);
1635                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1636                 send_mpa_request(cm_node, skb);
1637                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1638                 break;
1639         case NES_CM_STATE_MPAREQ_RCVD:
1640                 /* passive open, so should not be here */
1641                 passive_open_err(cm_node, skb, 1);
1642                 break;
1643         case NES_CM_STATE_LISTENING:
1644         case NES_CM_STATE_CLOSED:
1645                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1646                 cleanup_retrans_entry(cm_node);
1647                 send_reset(cm_node, skb);
1648                 break;
1649         case NES_CM_STATE_ESTABLISHED:
1650         case NES_CM_STATE_FIN_WAIT1:
1651         case NES_CM_STATE_FIN_WAIT2:
1652         case NES_CM_STATE_LAST_ACK:
1653         case NES_CM_STATE_TSA:
1654         case NES_CM_STATE_CLOSING:
1655         case NES_CM_STATE_UNKNOWN:
1656         case NES_CM_STATE_MPAREQ_SENT:
1657         default:
1658                 drop_packet(skb);
1659                 break;
1660         }
1661 }
1662
1663 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1664         struct tcphdr *tcph)
1665 {
1666         int datasize = 0;
1667         u32 inc_sequence;
1668         u32 rem_seq_ack;
1669         u32 rem_seq;
1670         int ret = 0;
1671         int optionsize;
1672         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1673
1674         if (check_seq(cm_node, tcph, skb))
1675                 return -EINVAL;
1676
1677         skb_pull(skb, tcph->doff << 2);
1678         inc_sequence = ntohl(tcph->seq);
1679         rem_seq = ntohl(tcph->seq);
1680         rem_seq_ack =  ntohl(tcph->ack_seq);
1681         datasize = skb->len;
1682         switch (cm_node->state) {
1683         case NES_CM_STATE_SYN_RCVD:
1684                 /* Passive OPEN */
1685                 cleanup_retrans_entry(cm_node);
1686                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1687                 if (ret)
1688                         break;
1689                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1690                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1691                 if (datasize) {
1692                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1693                         handle_rcv_mpa(cm_node, skb);
1694                 } else  /* rcvd ACK only */
1695                         dev_kfree_skb_any(skb);
1696                 break;
1697         case NES_CM_STATE_ESTABLISHED:
1698                 /* Passive OPEN */
1699                 cleanup_retrans_entry(cm_node);
1700                 if (datasize) {
1701                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1702                         handle_rcv_mpa(cm_node, skb);
1703                 } else
1704                         drop_packet(skb);
1705                 break;
1706         case NES_CM_STATE_MPAREQ_SENT:
1707                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1708                 if (datasize) {
1709                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1710                         handle_rcv_mpa(cm_node, skb);
1711                 } else  /* Could be just an ack pkt.. */
1712                         dev_kfree_skb_any(skb);
1713                 break;
1714         case NES_CM_STATE_LISTENING:
1715         case NES_CM_STATE_CLOSED:
1716                 cleanup_retrans_entry(cm_node);
1717                 send_reset(cm_node, skb);
1718                 break;
1719         case NES_CM_STATE_LAST_ACK:
1720         case NES_CM_STATE_CLOSING:
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                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1725                 drop_packet(skb);
1726                 break;
1727         case NES_CM_STATE_FIN_WAIT1:
1728                 cleanup_retrans_entry(cm_node);
1729                 drop_packet(skb);
1730                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1731                 break;
1732         case NES_CM_STATE_SYN_SENT:
1733         case NES_CM_STATE_FIN_WAIT2:
1734         case NES_CM_STATE_TSA:
1735         case NES_CM_STATE_MPAREQ_RCVD:
1736         case NES_CM_STATE_UNKNOWN:
1737         default:
1738                 cleanup_retrans_entry(cm_node);
1739                 drop_packet(skb);
1740                 break;
1741         }
1742         return ret;
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         int ret = 0;
1849         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1850
1851         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1852                 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1853                 tcph->ack, tcph->rst, tcph->fin);
1854
1855         if (tcph->rst)
1856                 pkt_type = NES_PKT_TYPE_RST;
1857         else if (tcph->syn) {
1858                 pkt_type = NES_PKT_TYPE_SYN;
1859                 if (tcph->ack)
1860                         pkt_type = NES_PKT_TYPE_SYNACK;
1861         } else if (tcph->ack)
1862                 pkt_type = NES_PKT_TYPE_ACK;
1863         if (tcph->fin)
1864                 fin_set = 1;
1865
1866         switch (pkt_type) {
1867         case NES_PKT_TYPE_SYN:
1868                 handle_syn_pkt(cm_node, skb, tcph);
1869                 break;
1870         case NES_PKT_TYPE_SYNACK:
1871                 handle_synack_pkt(cm_node, skb, tcph);
1872                 break;
1873         case NES_PKT_TYPE_ACK:
1874                 ret = handle_ack_pkt(cm_node, skb, tcph);
1875                 if (fin_set && !ret)
1876                         handle_fin_pkt(cm_node);
1877                 break;
1878         case NES_PKT_TYPE_RST:
1879                 handle_rst_pkt(cm_node, skb, tcph);
1880                 break;
1881         default:
1882                 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
1883                         handle_fin_pkt(cm_node);
1884                 drop_packet(skb);
1885                 break;
1886         }
1887 }
1888
1889 /**
1890  * mini_cm_listen - create a listen node with params
1891  */
1892 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1893         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1894 {
1895         struct nes_cm_listener *listener;
1896         unsigned long flags;
1897
1898         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1899                 cm_info->loc_addr, cm_info->loc_port);
1900
1901         /* cannot have multiple matching listeners */
1902         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1903                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1904         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1905                 /* find automatically incs ref count ??? */
1906                 atomic_dec(&listener->ref_count);
1907                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1908                 return NULL;
1909         }
1910
1911         if (!listener) {
1912                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1913                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1914                 if (!listener) {
1915                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1916                         return NULL;
1917                 }
1918
1919                 listener->loc_addr = htonl(cm_info->loc_addr);
1920                 listener->loc_port = htons(cm_info->loc_port);
1921                 listener->reused_node = 0;
1922
1923                 atomic_set(&listener->ref_count, 1);
1924         }
1925         /* pasive case */
1926         /* find already inc'ed the ref count */
1927         else {
1928                 listener->reused_node = 1;
1929         }
1930
1931         listener->cm_id = cm_info->cm_id;
1932         atomic_set(&listener->pend_accepts_cnt, 0);
1933         listener->cm_core = cm_core;
1934         listener->nesvnic = nesvnic;
1935         atomic_inc(&cm_core->node_cnt);
1936
1937         listener->conn_type = cm_info->conn_type;
1938         listener->backlog = cm_info->backlog;
1939         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1940
1941         if (!listener->reused_node) {
1942                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1943                 list_add(&listener->list, &cm_core->listen_list.list);
1944                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1945                 atomic_inc(&cm_core->listen_node_cnt);
1946         }
1947
1948         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
1949                         " listener = %p, backlog = %d, cm_id = %p.\n",
1950                         cm_info->loc_addr, cm_info->loc_port,
1951                         listener, listener->backlog, listener->cm_id);
1952
1953         return listener;
1954 }
1955
1956
1957 /**
1958  * mini_cm_connect - make a connection node with params
1959  */
1960 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1961         struct nes_vnic *nesvnic, u16 private_data_len,
1962         void *private_data, struct nes_cm_info *cm_info)
1963 {
1964         int ret = 0;
1965         struct nes_cm_node *cm_node;
1966         struct nes_cm_listener *loopbackremotelistener;
1967         struct nes_cm_node *loopbackremotenode;
1968         struct nes_cm_info loopback_cm_info;
1969         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
1970         struct ietf_mpa_frame *mpa_frame = NULL;
1971
1972         /* create a CM connection node */
1973         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
1974         if (!cm_node)
1975                 return NULL;
1976         mpa_frame = &cm_node->mpa_frame;
1977         strcpy(mpa_frame->key, IEFT_MPA_KEY_REQ);
1978         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
1979         mpa_frame->rev =  IETF_MPA_VERSION;
1980         mpa_frame->priv_data_len = htons(private_data_len);
1981
1982         /* set our node side to client (active) side */
1983         cm_node->tcp_cntxt.client = 1;
1984         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1985
1986         if (cm_info->loc_addr == cm_info->rem_addr) {
1987                 loopbackremotelistener = find_listener(cm_core,
1988                                 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
1989                                 NES_CM_LISTENER_ACTIVE_STATE);
1990                 if (loopbackremotelistener == NULL) {
1991                         create_event(cm_node, NES_CM_EVENT_ABORTED);
1992                 } else {
1993                         loopback_cm_info = *cm_info;
1994                         loopback_cm_info.loc_port = cm_info->rem_port;
1995                         loopback_cm_info.rem_port = cm_info->loc_port;
1996                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
1997                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
1998                                 &loopback_cm_info, loopbackremotelistener);
1999                         if (!loopbackremotenode) {
2000                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2001                                 return NULL;
2002                         }
2003                         atomic_inc(&cm_loopbacks);
2004                         loopbackremotenode->loopbackpartner = cm_node;
2005                         loopbackremotenode->tcp_cntxt.rcv_wscale =
2006                                 NES_CM_DEFAULT_RCV_WND_SCALE;
2007                         cm_node->loopbackpartner = loopbackremotenode;
2008                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2009                                 private_data_len);
2010                         loopbackremotenode->mpa_frame_size = private_data_len;
2011
2012                         /* we are done handling this state. */
2013                         /* set node to a TSA state */
2014                         cm_node->state = NES_CM_STATE_TSA;
2015                         cm_node->tcp_cntxt.rcv_nxt =
2016                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
2017                         loopbackremotenode->tcp_cntxt.rcv_nxt =
2018                                 cm_node->tcp_cntxt.loc_seq_num;
2019                         cm_node->tcp_cntxt.max_snd_wnd =
2020                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2021                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
2022                                 cm_node->tcp_cntxt.rcv_wnd;
2023                         cm_node->tcp_cntxt.snd_wnd =
2024                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2025                         loopbackremotenode->tcp_cntxt.snd_wnd =
2026                                 cm_node->tcp_cntxt.rcv_wnd;
2027                         cm_node->tcp_cntxt.snd_wscale =
2028                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
2029                         loopbackremotenode->tcp_cntxt.snd_wscale =
2030                                 cm_node->tcp_cntxt.rcv_wscale;
2031                         loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2032                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2033                 }
2034                 return cm_node;
2035         }
2036
2037         /* set our node side to client (active) side */
2038         cm_node->tcp_cntxt.client = 1;
2039         /* init our MPA frame ptr */
2040         memcpy(mpa_frame->priv_data, private_data, private_data_len);
2041
2042         cm_node->mpa_frame_size = mpa_frame_size;
2043
2044         /* send a syn and goto syn sent state */
2045         cm_node->state = NES_CM_STATE_SYN_SENT;
2046         ret = send_syn(cm_node, 0, NULL);
2047
2048         if (ret) {
2049                 /* error in sending the syn free up the cm_node struct */
2050                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2051                         "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2052                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2053                         cm_node->cm_id);
2054                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2055                 cm_node = NULL;
2056         }
2057
2058         if (cm_node)
2059                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2060                         "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2061                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2062                         cm_node->cm_id);
2063
2064         return cm_node;
2065 }
2066
2067
2068 /**
2069  * mini_cm_accept - accept a connection
2070  * This function is never called
2071  */
2072 static int mini_cm_accept(struct nes_cm_core *cm_core,
2073         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2074 {
2075         return 0;
2076 }
2077
2078
2079 /**
2080  * mini_cm_reject - reject and teardown a connection
2081  */
2082 static int mini_cm_reject(struct nes_cm_core *cm_core,
2083         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2084 {
2085         int ret = 0;
2086         int err = 0;
2087         int passive_state;
2088         struct nes_cm_event event;
2089         struct iw_cm_id *cm_id = cm_node->cm_id;
2090         struct nes_cm_node *loopback = cm_node->loopbackpartner;
2091
2092         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2093                 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2094
2095         if (cm_node->tcp_cntxt.client)
2096                 return ret;
2097         cleanup_retrans_entry(cm_node);
2098
2099         if (!loopback) {
2100                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2101                 if (passive_state == NES_SEND_RESET_EVENT) {
2102                         cm_node->state = NES_CM_STATE_CLOSED;
2103                         rem_ref_cm_node(cm_core, cm_node);
2104                 } else {
2105                         ret = send_mpa_reject(cm_node);
2106                         if (ret) {
2107                                 cm_node->state = NES_CM_STATE_CLOSED;
2108                                 err = send_reset(cm_node, NULL);
2109                                 if (err)
2110                                         WARN_ON(1);
2111                         } else
2112                                 cm_id->add_ref(cm_id);
2113                 }
2114         } else {
2115                 cm_node->cm_id = NULL;
2116                 event.cm_node = loopback;
2117                 event.cm_info.rem_addr = loopback->rem_addr;
2118                 event.cm_info.loc_addr = loopback->loc_addr;
2119                 event.cm_info.rem_port = loopback->rem_port;
2120                 event.cm_info.loc_port = loopback->loc_port;
2121                 event.cm_info.cm_id = loopback->cm_id;
2122                 cm_event_mpa_reject(&event);
2123                 rem_ref_cm_node(cm_core, cm_node);
2124                 loopback->state = NES_CM_STATE_CLOSING;
2125
2126                 cm_id = loopback->cm_id;
2127                 rem_ref_cm_node(cm_core, loopback);
2128                 cm_id->rem_ref(cm_id);
2129         }
2130
2131         return ret;
2132 }
2133
2134
2135 /**
2136  * mini_cm_close
2137  */
2138 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2139 {
2140         int ret = 0;
2141
2142         if (!cm_core || !cm_node)
2143                 return -EINVAL;
2144
2145         switch (cm_node->state) {
2146         case NES_CM_STATE_SYN_RCVD:
2147         case NES_CM_STATE_SYN_SENT:
2148         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2149         case NES_CM_STATE_ESTABLISHED:
2150         case NES_CM_STATE_ACCEPTING:
2151         case NES_CM_STATE_MPAREQ_SENT:
2152         case NES_CM_STATE_MPAREQ_RCVD:
2153                 cleanup_retrans_entry(cm_node);
2154                 send_reset(cm_node, NULL);
2155                 break;
2156         case NES_CM_STATE_CLOSE_WAIT:
2157                 cm_node->state = NES_CM_STATE_LAST_ACK;
2158                 send_fin(cm_node, NULL);
2159                 break;
2160         case NES_CM_STATE_FIN_WAIT1:
2161         case NES_CM_STATE_FIN_WAIT2:
2162         case NES_CM_STATE_LAST_ACK:
2163         case NES_CM_STATE_TIME_WAIT:
2164         case NES_CM_STATE_CLOSING:
2165                 ret = -1;
2166                 break;
2167         case NES_CM_STATE_MPAREJ_RCVD:
2168         case NES_CM_STATE_LISTENING:
2169         case NES_CM_STATE_UNKNOWN:
2170         case NES_CM_STATE_INITED:
2171         case NES_CM_STATE_CLOSED:
2172                 ret = rem_ref_cm_node(cm_core, cm_node);
2173                 break;
2174         case NES_CM_STATE_TSA:
2175                 if (cm_node->send_entry)
2176                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2177                                 "send_entry=%p\n", cm_node->send_entry);
2178                 ret = rem_ref_cm_node(cm_core, cm_node);
2179                 break;
2180         }
2181         return ret;
2182 }
2183
2184
2185 /**
2186  * recv_pkt - recv an ETHERNET packet, and process it through CM
2187  * node state machine
2188  */
2189 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2190         struct nes_vnic *nesvnic, struct sk_buff *skb)
2191 {
2192         struct nes_cm_node *cm_node = NULL;
2193         struct nes_cm_listener *listener = NULL;
2194         struct iphdr *iph;
2195         struct tcphdr *tcph;
2196         struct nes_cm_info nfo;
2197         int skb_handled = 1;
2198         __be32 tmp_daddr, tmp_saddr;
2199
2200         if (!skb)
2201                 return 0;
2202         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2203                 return 0;
2204         }
2205
2206         iph = (struct iphdr *)skb->data;
2207         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2208
2209         nfo.loc_addr = ntohl(iph->daddr);
2210         nfo.loc_port = ntohs(tcph->dest);
2211         nfo.rem_addr = ntohl(iph->saddr);
2212         nfo.rem_port = ntohs(tcph->source);
2213
2214         tmp_daddr = cpu_to_be32(iph->daddr);
2215         tmp_saddr = cpu_to_be32(iph->saddr);
2216
2217         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2218                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2219
2220         do {
2221                 cm_node = find_node(cm_core,
2222                         nfo.rem_port, nfo.rem_addr,
2223                         nfo.loc_port, nfo.loc_addr);
2224
2225                 if (!cm_node) {
2226                         /* Only type of packet accepted are for */
2227                         /* the PASSIVE open (syn only) */
2228                         if ((!tcph->syn) || (tcph->ack)) {
2229                                 skb_handled = 0;
2230                                 break;
2231                         }
2232                         listener = find_listener(cm_core, nfo.loc_addr,
2233                                 nfo.loc_port,
2234                                 NES_CM_LISTENER_ACTIVE_STATE);
2235                         if (!listener) {
2236                                 nfo.cm_id = NULL;
2237                                 nfo.conn_type = 0;
2238                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2239                                 skb_handled = 0;
2240                                 break;
2241                         }
2242                         nfo.cm_id = listener->cm_id;
2243                         nfo.conn_type = listener->conn_type;
2244                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2245                                 listener);
2246                         if (!cm_node) {
2247                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2248                                         "node\n");
2249                                 cm_packets_dropped++;
2250                                 atomic_dec(&listener->ref_count);
2251                                 dev_kfree_skb_any(skb);
2252                                 break;
2253                         }
2254                         if (!tcph->rst && !tcph->fin) {
2255                                 cm_node->state = NES_CM_STATE_LISTENING;
2256                         } else {
2257                                 cm_packets_dropped++;
2258                                 rem_ref_cm_node(cm_core, cm_node);
2259                                 dev_kfree_skb_any(skb);
2260                                 break;
2261                         }
2262                         add_ref_cm_node(cm_node);
2263                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2264                         rem_ref_cm_node(cm_core, cm_node);
2265                         atomic_inc(&cm_accel_dropped_pkts);
2266                         dev_kfree_skb_any(skb);
2267                         break;
2268                 }
2269                 skb_reset_network_header(skb);
2270                 skb_set_transport_header(skb, sizeof(*tcph));
2271                 skb->len = ntohs(iph->tot_len);
2272                 process_packet(cm_node, skb, cm_core);
2273                 rem_ref_cm_node(cm_core, cm_node);
2274         } while (0);
2275         return skb_handled;
2276 }
2277
2278
2279 /**
2280  * nes_cm_alloc_core - allocate a top level instance of a cm core
2281  */
2282 static struct nes_cm_core *nes_cm_alloc_core(void)
2283 {
2284         struct nes_cm_core *cm_core;
2285
2286         /* setup the CM core */
2287         /* alloc top level core control structure */
2288         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2289         if (!cm_core)
2290                 return NULL;
2291
2292         INIT_LIST_HEAD(&cm_core->connected_nodes);
2293         init_timer(&cm_core->tcp_timer);
2294         cm_core->tcp_timer.function = nes_cm_timer_tick;
2295
2296         cm_core->mtu   = NES_CM_DEFAULT_MTU;
2297         cm_core->state = NES_CM_STATE_INITED;
2298         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2299
2300         atomic_set(&cm_core->events_posted, 0);
2301
2302         cm_core->api = &nes_cm_api;
2303
2304         spin_lock_init(&cm_core->ht_lock);
2305         spin_lock_init(&cm_core->listen_list_lock);
2306
2307         INIT_LIST_HEAD(&cm_core->listen_list.list);
2308
2309         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2310
2311         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2312         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2313         cm_core->post_event = nes_cm_post_event;
2314         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2315         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2316
2317         print_core(cm_core);
2318         return cm_core;
2319 }
2320
2321
2322 /**
2323  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2324  */
2325 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2326 {
2327         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2328
2329         if (!cm_core)
2330                 return -EINVAL;
2331
2332         barrier();
2333
2334         if (timer_pending(&cm_core->tcp_timer)) {
2335                 del_timer(&cm_core->tcp_timer);
2336         }
2337
2338         destroy_workqueue(cm_core->event_wq);
2339         destroy_workqueue(cm_core->disconn_wq);
2340         nes_debug(NES_DBG_CM, "\n");
2341         kfree(cm_core);
2342
2343         return 0;
2344 }
2345
2346
2347 /**
2348  * mini_cm_get
2349  */
2350 static int mini_cm_get(struct nes_cm_core *cm_core)
2351 {
2352         return cm_core->state;
2353 }
2354
2355
2356 /**
2357  * mini_cm_set
2358  */
2359 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2360 {
2361         int ret = 0;
2362
2363         switch (type) {
2364         case NES_CM_SET_PKT_SIZE:
2365                 cm_core->mtu = value;
2366                 break;
2367         case NES_CM_SET_FREE_PKT_Q_SIZE:
2368                 cm_core->free_tx_pkt_max = value;
2369                 break;
2370         default:
2371                 /* unknown set option */
2372                 ret = -EINVAL;
2373         }
2374
2375         return ret;
2376 }
2377
2378
2379 /**
2380  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2381  * successfully exchanged when this is called
2382  */
2383 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2384 {
2385         int ret = 0;
2386
2387         if (!nesqp)
2388                 return -EINVAL;
2389
2390         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2391                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2392                         NES_QPCONTEXT_MISC_DROS);
2393
2394         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2395                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2396
2397         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2398
2399         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2400
2401         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2402                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2403
2404         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2405                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2406                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2407
2408         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2409                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2410                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2411
2412         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2413         nesqp->nesqp_context->ts_recent = 0;
2414         nesqp->nesqp_context->ts_age = 0;
2415         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2416         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2417         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2418         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2419                         cm_node->tcp_cntxt.rcv_wscale);
2420         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2421         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2422         nesqp->nesqp_context->srtt = 0;
2423         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2424         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2425         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2426         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2427         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2428         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2429
2430         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2431                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2432                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2433                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2434                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2435                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2436                         le32_to_cpu(nesqp->nesqp_context->misc));
2437         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2438         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2439         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2440
2441         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2442         cm_node->state = NES_CM_STATE_TSA;
2443
2444         return ret;
2445 }
2446
2447
2448 /**
2449  * nes_cm_disconn
2450  */
2451 int nes_cm_disconn(struct nes_qp *nesqp)
2452 {
2453         unsigned long flags;
2454
2455         spin_lock_irqsave(&nesqp->lock, flags);
2456         if (nesqp->disconn_pending == 0) {
2457                 nesqp->disconn_pending++;
2458                 spin_unlock_irqrestore(&nesqp->lock, flags);
2459                 /* init our disconnect work element, to */
2460                 INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);
2461
2462                 queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
2463         } else
2464                 spin_unlock_irqrestore(&nesqp->lock, flags);
2465
2466         return 0;
2467 }
2468
2469
2470 /**
2471  * nes_disconnect_worker
2472  */
2473 static void nes_disconnect_worker(struct work_struct *work)
2474 {
2475         struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);
2476
2477         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2478                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2479         nes_cm_disconn_true(nesqp);
2480 }
2481
2482
2483 /**
2484  * nes_cm_disconn_true
2485  */
2486 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2487 {
2488         unsigned long flags;
2489         int ret = 0;
2490         struct iw_cm_id *cm_id;
2491         struct iw_cm_event cm_event;
2492         struct nes_vnic *nesvnic;
2493         u16 last_ae;
2494         u8 original_hw_tcp_state;
2495         u8 original_ibqp_state;
2496         u8 issued_disconnect_reset = 0;
2497
2498         if (!nesqp) {
2499                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2500                 return -1;
2501         }
2502
2503         spin_lock_irqsave(&nesqp->lock, flags);
2504         cm_id = nesqp->cm_id;
2505         /* make sure we havent already closed this connection */
2506         if (!cm_id) {
2507                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2508                                 nesqp->hwqp.qp_id);
2509                 spin_unlock_irqrestore(&nesqp->lock, flags);
2510                 return -1;
2511         }
2512
2513         nesvnic = to_nesvnic(nesqp->ibqp.device);
2514         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2515
2516         original_hw_tcp_state = nesqp->hw_tcp_state;
2517         original_ibqp_state   = nesqp->ibqp_state;
2518         last_ae = nesqp->last_aeq;
2519
2520
2521         nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);
2522
2523         if ((nesqp->cm_id) && (cm_id->event_handler)) {
2524                 if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2525                                 ((original_ibqp_state == IB_QPS_RTS) &&
2526                                 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2527                         atomic_inc(&cm_disconnects);
2528                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2529                         if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
2530                                 cm_event.status = IW_CM_EVENT_STATUS_RESET;
2531                                 nes_debug(NES_DBG_CM, "Generating a CM "
2532                                         "Disconnect Event (status reset) for "
2533                                         "QP%u, cm_id = %p. \n",
2534                                         nesqp->hwqp.qp_id, cm_id);
2535                         } else
2536                                 cm_event.status = IW_CM_EVENT_STATUS_OK;
2537
2538                         cm_event.local_addr = cm_id->local_addr;
2539                         cm_event.remote_addr = cm_id->remote_addr;
2540                         cm_event.private_data = NULL;
2541                         cm_event.private_data_len = 0;
2542
2543                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2544                                 " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2545                                 "cm_id = %p, refcount = %u.\n",
2546                                 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2547                                 nesqp->hwqp.sq_tail, cm_id,
2548                                 atomic_read(&nesqp->refcount));
2549
2550                         spin_unlock_irqrestore(&nesqp->lock, flags);
2551                         ret = cm_id->event_handler(cm_id, &cm_event);
2552                         if (ret)
2553                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2554                                         "returned, ret=%d\n", ret);
2555                         spin_lock_irqsave(&nesqp->lock, flags);
2556                 }
2557
2558                 nesqp->disconn_pending = 0;
2559                 /* There might have been another AE while the lock was released */
2560                 original_hw_tcp_state = nesqp->hw_tcp_state;
2561                 original_ibqp_state   = nesqp->ibqp_state;
2562                 last_ae = nesqp->last_aeq;
2563
2564                 if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
2565                                 ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2566                                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2567                                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2568                                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2569                         atomic_inc(&cm_closes);
2570                         nesqp->cm_id = NULL;
2571                         nesqp->in_disconnect = 0;
2572                         spin_unlock_irqrestore(&nesqp->lock, flags);
2573                         nes_disconnect(nesqp, 1);
2574
2575                         cm_id->provider_data = nesqp;
2576                         /* Send up the close complete event */
2577                         cm_event.event = IW_CM_EVENT_CLOSE;
2578                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2579                         cm_event.provider_data = cm_id->provider_data;
2580                         cm_event.local_addr = cm_id->local_addr;
2581                         cm_event.remote_addr = cm_id->remote_addr;
2582                         cm_event.private_data = NULL;
2583                         cm_event.private_data_len = 0;
2584
2585                         ret = cm_id->event_handler(cm_id, &cm_event);
2586                         if (ret) {
2587                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2588                         }
2589
2590                         cm_id->rem_ref(cm_id);
2591
2592                         spin_lock_irqsave(&nesqp->lock, flags);
2593                         if (nesqp->flush_issued == 0) {
2594                                 nesqp->flush_issued = 1;
2595                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2596                                 flush_wqes(nesvnic->nesdev, nesqp,
2597                                         NES_CQP_FLUSH_RQ, 1);
2598                         } else
2599                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2600                 } else {
2601                         cm_id = nesqp->cm_id;
2602                         spin_unlock_irqrestore(&nesqp->lock, flags);
2603                         /* check to see if the inbound reset beat the outbound reset */
2604                         if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
2605                                 nes_debug(NES_DBG_CM, "QP%u: Decing refcount "
2606                                         "due to inbound reset beating the "
2607                                         "outbound reset.\n", nesqp->hwqp.qp_id);
2608                         }
2609                 }
2610         } else {
2611                 nesqp->disconn_pending = 0;
2612                 spin_unlock_irqrestore(&nesqp->lock, flags);
2613         }
2614
2615         return 0;
2616 }
2617
2618
2619 /**
2620  * nes_disconnect
2621  */
2622 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2623 {
2624         int ret = 0;
2625         struct nes_vnic *nesvnic;
2626         struct nes_device *nesdev;
2627         struct nes_ib_device *nesibdev;
2628
2629         nesvnic = to_nesvnic(nesqp->ibqp.device);
2630         if (!nesvnic)
2631                 return -EINVAL;
2632
2633         nesdev = nesvnic->nesdev;
2634         nesibdev = nesvnic->nesibdev;
2635
2636         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2637                         atomic_read(&nesvnic->netdev->refcnt));
2638
2639         if (nesqp->active_conn) {
2640
2641                 /* indicate this connection is NOT active */
2642                 nesqp->active_conn = 0;
2643         } else {
2644                 /* Need to free the Last Streaming Mode Message */
2645                 if (nesqp->ietf_frame) {
2646                         if (nesqp->lsmm_mr)
2647                                 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2648                         pci_free_consistent(nesdev->pcidev,
2649                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2650                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2651                 }
2652         }
2653
2654         /* close the CM node down if it is still active */
2655         if (nesqp->cm_node) {
2656                 nes_debug(NES_DBG_CM, "Call close API\n");
2657
2658                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2659         }
2660
2661         return ret;
2662 }
2663
2664
2665 /**
2666  * nes_accept
2667  */
2668 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2669 {
2670         u64 u64temp;
2671         struct ib_qp *ibqp;
2672         struct nes_qp *nesqp;
2673         struct nes_vnic *nesvnic;
2674         struct nes_device *nesdev;
2675         struct nes_cm_node *cm_node;
2676         struct nes_adapter *adapter;
2677         struct ib_qp_attr attr;
2678         struct iw_cm_event cm_event;
2679         struct nes_hw_qp_wqe *wqe;
2680         struct nes_v4_quad nes_quad;
2681         u32 crc_value;
2682         int ret;
2683         int passive_state;
2684         struct nes_ib_device *nesibdev;
2685         struct ib_mr *ibmr = NULL;
2686         struct ib_phys_buf ibphysbuf;
2687         struct nes_pd *nespd;
2688         u64 tagged_offset;
2689
2690
2691
2692         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2693         if (!ibqp)
2694                 return -EINVAL;
2695
2696         /* get all our handles */
2697         nesqp = to_nesqp(ibqp);
2698         nesvnic = to_nesvnic(nesqp->ibqp.device);
2699         nesdev = nesvnic->nesdev;
2700         adapter = nesdev->nesadapter;
2701
2702         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2703         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2704                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2705                 nesvnic->netdev->name);
2706
2707         /* associate the node with the QP */
2708         nesqp->cm_node = (void *)cm_node;
2709         cm_node->nesqp = nesqp;
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                         pci_free_consistent(nesdev->pcidev,
2763                                 nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2764                                 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2765                         return -ENOMEM;
2766                 }
2767
2768                 ibmr->pd = &nespd->ibpd;
2769                 ibmr->device = nespd->ibpd.device;
2770                 nesqp->lsmm_mr = ibmr;
2771
2772                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2773                 set_wqe_64bit_value(wqe->wqe_words,
2774                         NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2775                         u64temp);
2776                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2777                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2778                         NES_IWARP_SQ_WQE_WRPDU);
2779                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2780                         cpu_to_le32(conn_param->private_data_len +
2781                         sizeof(struct ietf_mpa_frame));
2782                 set_wqe_64bit_value(wqe->wqe_words,
2783                                         NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
2784                                         (u64)(unsigned long)nesqp->ietf_frame);
2785                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2786                         cpu_to_le32(conn_param->private_data_len +
2787                         sizeof(struct ietf_mpa_frame));
2788                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
2789
2790                 nesqp->nesqp_context->ird_ord_sizes |=
2791                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2792                         NES_QPCONTEXT_ORDIRD_WRPDU);
2793         } else {
2794                 nesqp->nesqp_context->ird_ord_sizes |=
2795                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
2796         }
2797         nesqp->skip_lsmm = 1;
2798
2799
2800         /* Cache the cm_id in the qp */
2801         nesqp->cm_id = cm_id;
2802         cm_node->cm_id = cm_id;
2803
2804         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2805         cm_id->provider_data = nesqp;
2806         nesqp->active_conn   = 0;
2807
2808         if (cm_node->state == NES_CM_STATE_TSA)
2809                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2810                         cm_node);
2811
2812         nes_cm_init_tsa_conn(nesqp, cm_node);
2813
2814         nesqp->nesqp_context->tcpPorts[0] =
2815                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2816         nesqp->nesqp_context->tcpPorts[1] =
2817                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2818
2819         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2820                 nesqp->nesqp_context->ip0 =
2821                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2822         else
2823                 nesqp->nesqp_context->ip0 =
2824                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2825
2826         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2827                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2828                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2829
2830         nesqp->nesqp_context->arp_index_vlan |=
2831                 cpu_to_le32(nes_arp_table(nesdev,
2832                         le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2833                         NES_ARP_RESOLVE) << 16);
2834
2835         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2836                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2837
2838         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2839
2840         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2841                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2842         nesqp->nesqp_context->ird_ord_sizes |=
2843                 cpu_to_le32((u32)conn_param->ord);
2844
2845         memset(&nes_quad, 0, sizeof(nes_quad));
2846         nes_quad.DstIpAdrIndex =
2847                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2848         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2849                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2850         else
2851                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2852         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2853         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2854
2855         /* Produce hash key */
2856         crc_value = get_crc_value(&nes_quad);
2857         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2858         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2859                 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2860
2861         nesqp->hte_index &= adapter->hte_index_mask;
2862         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2863
2864         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2865
2866         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2867                         "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2868                         "private data length=%zu.\n", nesqp->hwqp.qp_id,
2869                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2870                         ntohs(cm_id->remote_addr.sin_port),
2871                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2872                         ntohs(cm_id->local_addr.sin_port),
2873                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2874                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2875                         conn_param->private_data_len +
2876                         sizeof(struct ietf_mpa_frame));
2877
2878
2879         /* notify OF layer that accept event was successful */
2880         cm_id->add_ref(cm_id);
2881         nes_add_ref(&nesqp->ibqp);
2882
2883         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2884         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2885         cm_event.provider_data = (void *)nesqp;
2886         cm_event.local_addr = cm_id->local_addr;
2887         cm_event.remote_addr = cm_id->remote_addr;
2888         cm_event.private_data = NULL;
2889         cm_event.private_data_len = 0;
2890         ret = cm_id->event_handler(cm_id, &cm_event);
2891         attr.qp_state = IB_QPS_RTS;
2892         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2893         if (cm_node->loopbackpartner) {
2894                 cm_node->loopbackpartner->mpa_frame_size =
2895                         nesqp->private_data_len;
2896                 /* copy entire MPA frame to our cm_node's frame */
2897                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2898                         nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2899                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2900         }
2901         if (ret)
2902                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2903                         "ret=%d\n", __func__, __LINE__, ret);
2904
2905         passive_state = atomic_add_return(1, &cm_node->passive_state);
2906         if (passive_state == NES_SEND_RESET_EVENT)
2907                 create_event(cm_node, NES_CM_EVENT_RESET);
2908         return 0;
2909 }
2910
2911
2912 /**
2913  * nes_reject
2914  */
2915 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2916 {
2917         struct nes_cm_node *cm_node;
2918         struct nes_cm_node *loopback;
2919
2920         struct nes_cm_core *cm_core;
2921
2922         atomic_inc(&cm_rejects);
2923         cm_node = (struct nes_cm_node *) cm_id->provider_data;
2924         loopback = cm_node->loopbackpartner;
2925         cm_core = cm_node->cm_core;
2926         cm_node->cm_id = cm_id;
2927         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
2928
2929         if (cm_node->mpa_frame_size > MAX_CM_BUFFER)
2930                 return -EINVAL;
2931
2932         strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
2933         if (loopback) {
2934                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
2935                 loopback->mpa_frame.priv_data_len = pdata_len;
2936                 loopback->mpa_frame_size = sizeof(struct ietf_mpa_frame) +
2937                                 pdata_len;
2938         } else {
2939                 memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
2940                 cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
2941         }
2942
2943         cm_node->mpa_frame.rev = mpa_version;
2944         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
2945
2946         return cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
2947 }
2948
2949
2950 /**
2951  * nes_connect
2952  * setup and launch cm connect node
2953  */
2954 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2955 {
2956         struct ib_qp *ibqp;
2957         struct nes_qp *nesqp;
2958         struct nes_vnic *nesvnic;
2959         struct nes_device *nesdev;
2960         struct nes_cm_node *cm_node;
2961         struct nes_cm_info cm_info;
2962         int apbvt_set = 0;
2963
2964         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2965         if (!ibqp)
2966                 return -EINVAL;
2967         nesqp = to_nesqp(ibqp);
2968         if (!nesqp)
2969                 return -EINVAL;
2970         nesvnic = to_nesvnic(nesqp->ibqp.device);
2971         if (!nesvnic)
2972                 return -EINVAL;
2973         nesdev  = nesvnic->nesdev;
2974         if (!nesdev)
2975                 return -EINVAL;
2976
2977         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
2978                 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
2979                 ntohl(nesvnic->local_ipaddr),
2980                 ntohl(cm_id->remote_addr.sin_addr.s_addr),
2981                 ntohs(cm_id->remote_addr.sin_port),
2982                 ntohl(cm_id->local_addr.sin_addr.s_addr),
2983                 ntohs(cm_id->local_addr.sin_port));
2984
2985         atomic_inc(&cm_connects);
2986         nesqp->active_conn = 1;
2987
2988         /* cache the cm_id in the qp */
2989         nesqp->cm_id = cm_id;
2990
2991         cm_id->provider_data = nesqp;
2992
2993         nesqp->private_data_len = conn_param->private_data_len;
2994         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2995         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
2996         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
2997                 conn_param->private_data_len);
2998
2999         if (cm_id->local_addr.sin_addr.s_addr !=
3000                 cm_id->remote_addr.sin_addr.s_addr) {
3001                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3002                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3003                 apbvt_set = 1;
3004         }
3005
3006         /* set up the connection params for the node */
3007         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3008         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3009         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3010         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3011         cm_info.cm_id = cm_id;
3012         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3013
3014         cm_id->add_ref(cm_id);
3015
3016         /* create a connect CM node connection */
3017         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3018                 conn_param->private_data_len, (void *)conn_param->private_data,
3019                 &cm_info);
3020         if (!cm_node) {
3021                 if (apbvt_set)
3022                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3023                                 PCI_FUNC(nesdev->pcidev->devfn),
3024                                 NES_MANAGE_APBVT_DEL);
3025
3026                 cm_id->rem_ref(cm_id);
3027                 return -ENOMEM;
3028         }
3029
3030         cm_node->apbvt_set = apbvt_set;
3031         nesqp->cm_node = cm_node;
3032         cm_node->nesqp = nesqp;
3033         nes_add_ref(&nesqp->ibqp);
3034
3035         return 0;
3036 }
3037
3038
3039 /**
3040  * nes_create_listen
3041  */
3042 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3043 {
3044         struct nes_vnic *nesvnic;
3045         struct nes_cm_listener *cm_node;
3046         struct nes_cm_info cm_info;
3047         struct nes_adapter *adapter;
3048         int err;
3049
3050
3051         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3052                         cm_id, ntohs(cm_id->local_addr.sin_port));
3053
3054         nesvnic = to_nesvnic(cm_id->device);
3055         if (!nesvnic)
3056                 return -EINVAL;
3057         adapter = nesvnic->nesdev->nesadapter;
3058         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3059                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3060
3061         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3062                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3063
3064         /* setup listen params in our api call struct */
3065         cm_info.loc_addr = nesvnic->local_ipaddr;
3066         cm_info.loc_port = cm_id->local_addr.sin_port;
3067         cm_info.backlog = backlog;
3068         cm_info.cm_id = cm_id;
3069
3070         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3071
3072
3073         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3074         if (!cm_node) {
3075                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3076                                 __func__, __LINE__);
3077                 return -ENOMEM;
3078         }
3079
3080         cm_id->provider_data = cm_node;
3081
3082         if (!cm_node->reused_node) {
3083                 err = nes_manage_apbvt(nesvnic,
3084                         ntohs(cm_id->local_addr.sin_port),
3085                         PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3086                         NES_MANAGE_APBVT_ADD);
3087                 if (err) {
3088                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3089                                 err);
3090                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3091                         return err;
3092                 }
3093                 cm_listens_created++;
3094         }
3095
3096         cm_id->add_ref(cm_id);
3097         cm_id->provider_data = (void *)cm_node;
3098
3099
3100         return 0;
3101 }
3102
3103
3104 /**
3105  * nes_destroy_listen
3106  */
3107 int nes_destroy_listen(struct iw_cm_id *cm_id)
3108 {
3109         if (cm_id->provider_data)
3110                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3111         else
3112                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3113
3114         cm_id->rem_ref(cm_id);
3115
3116         return 0;
3117 }
3118
3119
3120 /**
3121  * nes_cm_recv
3122  */
3123 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3124 {
3125         int rc = 0;
3126         cm_packets_received++;
3127         if ((g_cm_core) && (g_cm_core->api)) {
3128                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3129         } else {
3130                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3131                                 " cm is not setup properly.\n");
3132         }
3133
3134         return rc;
3135 }
3136
3137
3138 /**
3139  * nes_cm_start
3140  * Start and init a cm core module
3141  */
3142 int nes_cm_start(void)
3143 {
3144         nes_debug(NES_DBG_CM, "\n");
3145         /* create the primary CM core, pass this handle to subsequent core inits */
3146         g_cm_core = nes_cm_alloc_core();
3147         if (g_cm_core) {
3148                 return 0;
3149         } else {
3150                 return -ENOMEM;
3151         }
3152 }
3153
3154
3155 /**
3156  * nes_cm_stop
3157  * stop and dealloc all cm core instances
3158  */
3159 int nes_cm_stop(void)
3160 {
3161         g_cm_core->api->destroy_cm_core(g_cm_core);
3162         return 0;
3163 }
3164
3165
3166 /**
3167  * cm_event_connected
3168  * handle a connected event, setup QPs and HW
3169  */
3170 static void cm_event_connected(struct nes_cm_event *event)
3171 {
3172         u64 u64temp;
3173         struct nes_qp *nesqp;
3174         struct nes_vnic *nesvnic;
3175         struct nes_device *nesdev;
3176         struct nes_cm_node *cm_node;
3177         struct nes_adapter *nesadapter;
3178         struct ib_qp_attr attr;
3179         struct iw_cm_id *cm_id;
3180         struct iw_cm_event cm_event;
3181         struct nes_hw_qp_wqe *wqe;
3182         struct nes_v4_quad nes_quad;
3183         u32 crc_value;
3184         int ret;
3185
3186         /* get all our handles */
3187         cm_node = event->cm_node;
3188         cm_id = cm_node->cm_id;
3189         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3190         nesqp = (struct nes_qp *)cm_id->provider_data;
3191         nesvnic = to_nesvnic(nesqp->ibqp.device);
3192         nesdev = nesvnic->nesdev;
3193         nesadapter = nesdev->nesadapter;
3194
3195         if (nesqp->destroyed) {
3196                 return;
3197         }
3198         atomic_inc(&cm_connecteds);
3199         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3200                         " local port 0x%04X. jiffies = %lu.\n",
3201                         nesqp->hwqp.qp_id,
3202                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
3203                         ntohs(cm_id->remote_addr.sin_port),
3204                         ntohs(cm_id->local_addr.sin_port),
3205                         jiffies);
3206
3207         nes_cm_init_tsa_conn(nesqp, cm_node);
3208
3209         /* set the QP tsa context */
3210         nesqp->nesqp_context->tcpPorts[0] =
3211                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3212         nesqp->nesqp_context->tcpPorts[1] =
3213                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3214         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3215                 nesqp->nesqp_context->ip0 =
3216                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3217         else
3218                 nesqp->nesqp_context->ip0 =
3219                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3220
3221         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3222                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3223                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3224         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3225                         nes_arp_table(nesdev,
3226                         le32_to_cpu(nesqp->nesqp_context->ip0),
3227                         NULL, NES_ARP_RESOLVE) << 16);
3228         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3229                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3230         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3231         nesqp->nesqp_context->ird_ord_sizes |=
3232                         cpu_to_le32((u32)1 <<
3233                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3234
3235         /* Adjust tail for not having a LSMM */
3236         nesqp->hwqp.sq_tail = 1;
3237
3238 #if defined(NES_SEND_FIRST_WRITE)
3239         if (cm_node->send_write0) {
3240                 nes_debug(NES_DBG_CM, "Sending first write.\n");
3241                 wqe = &nesqp->hwqp.sq_vbase[0];
3242                 u64temp = (unsigned long)nesqp;
3243                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3244                 set_wqe_64bit_value(wqe->wqe_words,
3245                                 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3246                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3247                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3248                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3249                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3250                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3251                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3252                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3253
3254                 /* use the reserved spot on the WQ for the extra first WQE */
3255                 nesqp->nesqp_context->ird_ord_sizes &=
3256                         cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3257                                                 NES_QPCONTEXT_ORDIRD_WRPDU |
3258                                                 NES_QPCONTEXT_ORDIRD_ALSMM));
3259                 nesqp->skip_lsmm = 1;
3260                 nesqp->hwqp.sq_tail = 0;
3261                 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3262                                 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3263         }
3264 #endif
3265
3266         memset(&nes_quad, 0, sizeof(nes_quad));
3267
3268         nes_quad.DstIpAdrIndex =
3269                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3270         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3271                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3272         else
3273                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3274         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3275         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3276
3277         /* Produce hash key */
3278         crc_value = get_crc_value(&nes_quad);
3279         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3280         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3281                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3282
3283         nesqp->hte_index &= nesadapter->hte_index_mask;
3284         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3285
3286         nesqp->ietf_frame = &cm_node->mpa_frame;
3287         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3288         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3289
3290         /* notify OF layer we successfully created the requested connection */
3291         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3292         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
3293         cm_event.provider_data = cm_id->provider_data;
3294         cm_event.local_addr.sin_family = AF_INET;
3295         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3296         cm_event.remote_addr = cm_id->remote_addr;
3297
3298         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3299         cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3300
3301         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3302         ret = cm_id->event_handler(cm_id, &cm_event);
3303         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3304
3305         if (ret)
3306                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3307                         "ret=%d\n", __func__, __LINE__, ret);
3308         attr.qp_state = IB_QPS_RTS;
3309         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3310
3311         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3312                 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3313
3314         return;
3315 }
3316
3317
3318 /**
3319  * cm_event_connect_error
3320  */
3321 static void cm_event_connect_error(struct nes_cm_event *event)
3322 {
3323         struct nes_qp *nesqp;
3324         struct iw_cm_id *cm_id;
3325         struct iw_cm_event cm_event;
3326         /* struct nes_cm_info cm_info; */
3327         int ret;
3328
3329         if (!event->cm_node)
3330                 return;
3331
3332         cm_id = event->cm_node->cm_id;
3333         if (!cm_id) {
3334                 return;
3335         }
3336
3337         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3338         nesqp = cm_id->provider_data;
3339
3340         if (!nesqp) {
3341                 return;
3342         }
3343
3344         /* notify OF layer about this connection error event */
3345         /* cm_id->rem_ref(cm_id); */
3346         nesqp->cm_id = NULL;
3347         cm_id->provider_data = NULL;
3348         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3349         cm_event.status = IW_CM_EVENT_STATUS_REJECTED;
3350         cm_event.provider_data = cm_id->provider_data;
3351         cm_event.local_addr = cm_id->local_addr;
3352         cm_event.remote_addr = cm_id->remote_addr;
3353         cm_event.private_data = NULL;
3354         cm_event.private_data_len = 0;
3355
3356         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3357                 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3358                 cm_event.remote_addr.sin_addr.s_addr);
3359
3360         ret = cm_id->event_handler(cm_id, &cm_event);
3361         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3362         if (ret)
3363                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3364                         "ret=%d\n", __func__, __LINE__, ret);
3365         cm_id->rem_ref(cm_id);
3366
3367         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3368         return;
3369 }
3370
3371
3372 /**
3373  * cm_event_reset
3374  */
3375 static void cm_event_reset(struct nes_cm_event *event)
3376 {
3377         struct nes_qp *nesqp;
3378         struct iw_cm_id *cm_id;
3379         struct iw_cm_event cm_event;
3380         /* struct nes_cm_info cm_info; */
3381         int ret;
3382
3383         if (!event->cm_node)
3384                 return;
3385
3386         if (!event->cm_node->cm_id)
3387                 return;
3388
3389         cm_id = event->cm_node->cm_id;
3390
3391         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3392         nesqp = cm_id->provider_data;
3393
3394         nesqp->cm_id = NULL;
3395         /* cm_id->provider_data = NULL; */
3396         cm_event.event = IW_CM_EVENT_DISCONNECT;
3397         cm_event.status = IW_CM_EVENT_STATUS_RESET;
3398         cm_event.provider_data = cm_id->provider_data;
3399         cm_event.local_addr = cm_id->local_addr;
3400         cm_event.remote_addr = cm_id->remote_addr;
3401         cm_event.private_data = NULL;
3402         cm_event.private_data_len = 0;
3403
3404         ret = cm_id->event_handler(cm_id, &cm_event);
3405         cm_id->add_ref(cm_id);
3406         atomic_inc(&cm_closes);
3407         cm_event.event = IW_CM_EVENT_CLOSE;
3408         cm_event.status = IW_CM_EVENT_STATUS_OK;
3409         cm_event.provider_data = cm_id->provider_data;
3410         cm_event.local_addr = cm_id->local_addr;
3411         cm_event.remote_addr = cm_id->remote_addr;
3412         cm_event.private_data = NULL;
3413         cm_event.private_data_len = 0;
3414         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3415         ret = cm_id->event_handler(cm_id, &cm_event);
3416
3417         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3418
3419
3420         /* notify OF layer about this connection error event */
3421         cm_id->rem_ref(cm_id);
3422
3423         return;
3424 }
3425
3426
3427 /**
3428  * cm_event_mpa_req
3429  */
3430 static void cm_event_mpa_req(struct nes_cm_event *event)
3431 {
3432         struct iw_cm_id   *cm_id;
3433         struct iw_cm_event cm_event;
3434         int ret;
3435         struct nes_cm_node *cm_node;
3436
3437         cm_node = event->cm_node;
3438         if (!cm_node)
3439                 return;
3440         cm_id = cm_node->cm_id;
3441
3442         atomic_inc(&cm_connect_reqs);
3443         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3444                         cm_node, cm_id, jiffies);
3445
3446         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3447         cm_event.status = IW_CM_EVENT_STATUS_OK;
3448         cm_event.provider_data = (void *)cm_node;
3449
3450         cm_event.local_addr.sin_family = AF_INET;
3451         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3452         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3453
3454         cm_event.remote_addr.sin_family = AF_INET;
3455         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3456         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3457         cm_event.private_data = cm_node->mpa_frame_buf;
3458         cm_event.private_data_len  = (u8) cm_node->mpa_frame_size;
3459
3460         ret = cm_id->event_handler(cm_id, &cm_event);
3461         if (ret)
3462                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3463                                 __func__, __LINE__, ret);
3464         return;
3465 }
3466
3467
3468 static void cm_event_mpa_reject(struct nes_cm_event *event)
3469 {
3470         struct iw_cm_id   *cm_id;
3471         struct iw_cm_event cm_event;
3472         struct nes_cm_node *cm_node;
3473         int ret;
3474
3475         cm_node = event->cm_node;
3476         if (!cm_node)
3477                 return;
3478         cm_id = cm_node->cm_id;
3479
3480         atomic_inc(&cm_connect_reqs);
3481         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3482                         cm_node, cm_id, jiffies);
3483
3484         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3485         cm_event.status = -ECONNREFUSED;
3486         cm_event.provider_data = cm_id->provider_data;
3487
3488         cm_event.local_addr.sin_family = AF_INET;
3489         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3490         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3491
3492         cm_event.remote_addr.sin_family = AF_INET;
3493         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3494         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3495
3496         cm_event.private_data = cm_node->mpa_frame_buf;
3497         cm_event.private_data_len = (u8) cm_node->mpa_frame_size;
3498
3499         nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3500                         "remove_addr=%08x\n",
3501                         cm_event.local_addr.sin_addr.s_addr,
3502                         cm_event.remote_addr.sin_addr.s_addr);
3503
3504         ret = cm_id->event_handler(cm_id, &cm_event);
3505         if (ret)
3506                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3507                                 __func__, __LINE__, ret);
3508
3509         return;
3510 }
3511
3512
3513 static void nes_cm_event_handler(struct work_struct *);
3514
3515 /**
3516  * nes_cm_post_event
3517  * post an event to the cm event handler
3518  */
3519 static int nes_cm_post_event(struct nes_cm_event *event)
3520 {
3521         atomic_inc(&event->cm_node->cm_core->events_posted);
3522         add_ref_cm_node(event->cm_node);
3523         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3524         INIT_WORK(&event->event_work, nes_cm_event_handler);
3525         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3526                 event->cm_node, event);
3527
3528         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3529
3530         nes_debug(NES_DBG_CM, "Exit\n");
3531         return 0;
3532 }
3533
3534
3535 /**
3536  * nes_cm_event_handler
3537  * worker function to handle cm events
3538  * will free instance of nes_cm_event
3539  */
3540 static void nes_cm_event_handler(struct work_struct *work)
3541 {
3542         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3543                         event_work);
3544         struct nes_cm_core *cm_core;
3545
3546         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3547                 return;
3548
3549         cm_core = event->cm_node->cm_core;
3550         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3551                 event, event->type, atomic_read(&cm_core->events_posted));
3552
3553         switch (event->type) {
3554         case NES_CM_EVENT_MPA_REQ:
3555                 cm_event_mpa_req(event);
3556                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3557                         event->cm_node);
3558                 break;
3559         case NES_CM_EVENT_RESET:
3560                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3561                         event->cm_node);
3562                 cm_event_reset(event);
3563                 break;
3564         case NES_CM_EVENT_CONNECTED:
3565                 if ((!event->cm_node->cm_id) ||
3566                         (event->cm_node->state != NES_CM_STATE_TSA))
3567                         break;
3568                 cm_event_connected(event);
3569                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3570                 break;
3571         case NES_CM_EVENT_MPA_REJECT:
3572                 if ((!event->cm_node->cm_id) ||
3573                                 (event->cm_node->state == NES_CM_STATE_TSA))
3574                         break;
3575                 cm_event_mpa_reject(event);
3576                 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3577                 break;
3578
3579         case NES_CM_EVENT_ABORTED:
3580                 if ((!event->cm_node->cm_id) ||
3581                         (event->cm_node->state == NES_CM_STATE_TSA))
3582                         break;
3583                 cm_event_connect_error(event);
3584                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3585                 break;
3586         case NES_CM_EVENT_DROPPED_PKT:
3587                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3588                 break;
3589         default:
3590                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3591                 break;
3592         }
3593
3594         atomic_dec(&cm_core->events_posted);
3595         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3596         rem_ref_cm_node(cm_core, event->cm_node);
3597         kfree(event);
3598
3599         return;
3600 }