git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/hw/nes/nes_cm.c

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