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