drivers/infiniband/hw/nes/nes_cm.c

   1 /*
   2  * Copyright (c) 2006 - 2009 Intel Corporation.  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 <linux/highmem.h>
  56 #include <linux/slab.h>
  57 #include <net/arp.h>
  58 #include <net/neighbour.h>
  59 #include <net/route.h>
  60 #include <net/ip_fib.h>
  61 #include <net/tcp.h>
  62
  63 #include "nes.h"
  64
  65 u32 cm_packets_sent;
  66 u32 cm_packets_bounced;
  67 u32 cm_packets_dropped;
  68 u32 cm_packets_retrans;
  69 u32 cm_packets_created;
  70 u32 cm_packets_received;
  71 atomic_t cm_listens_created;
  72 atomic_t cm_listens_destroyed;
  73 u32 cm_backlog_drops;
  74 atomic_t cm_loopbacks;
  75 atomic_t cm_nodes_created;
  76 atomic_t cm_nodes_destroyed;
  77 atomic_t cm_accel_dropped_pkts;
  78 atomic_t cm_resets_recvd;
  79
  80 static inline int mini_cm_accelerated(struct nes_cm_core *,
  81         struct nes_cm_node *);
  82 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
  83         struct nes_vnic *, struct nes_cm_info *);
  84 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
  85 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *,
  86         struct nes_vnic *, u16, void *, struct nes_cm_info *);
  87 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
  88 static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
  89         struct nes_cm_node *);
  90 static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
  91         struct nes_cm_node *);
  92 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *,
  93         struct sk_buff *);
  94 static int mini_cm_dealloc_core(struct nes_cm_core *);
  95 static int mini_cm_get(struct nes_cm_core *);
  96 static int mini_cm_set(struct nes_cm_core *, u32, u32);
  97
  98 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *,
  99         void *, u32, void *, u32, u8);
 100 static int add_ref_cm_node(struct nes_cm_node *);
 101 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
 102
 103 static int nes_cm_disconn_true(struct nes_qp *);
 104 static int nes_cm_post_event(struct nes_cm_event *event);
 105 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
 106 static void nes_disconnect_worker(struct work_struct *work);
 107
 108 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
 109 static int send_mpa_reject(struct nes_cm_node *);
 110 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
 111 static int send_reset(struct nes_cm_node *, struct sk_buff *);
 112 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
 113 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
 114 static void process_packet(struct nes_cm_node *, struct sk_buff *,
 115         struct nes_cm_core *);
 116
 117 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
 118 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
 119 static void cleanup_retrans_entry(struct nes_cm_node *);
 120 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
 121 static void free_retrans_entry(struct nes_cm_node *cm_node);
 122 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
 123         struct sk_buff *skb, int optionsize, int passive);
 124
 125 /* CM event handler functions */
 126 static void cm_event_connected(struct nes_cm_event *);
 127 static void cm_event_connect_error(struct nes_cm_event *);
 128 static void cm_event_reset(struct nes_cm_event *);
 129 static void cm_event_mpa_req(struct nes_cm_event *);
 130 static void cm_event_mpa_reject(struct nes_cm_event *);
 131 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
 132
 133 static void print_core(struct nes_cm_core *core);
 134
 135 /* External CM API Interface */
 136 /* instance of function pointers for client API */
 137 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
 138 static struct nes_cm_ops nes_cm_api = {
 139         mini_cm_accelerated,
 140         mini_cm_listen,
 141         mini_cm_del_listen,
 142         mini_cm_connect,
 143         mini_cm_close,
 144         mini_cm_accept,
 145         mini_cm_reject,
 146         mini_cm_recv_pkt,
 147         mini_cm_dealloc_core,
 148         mini_cm_get,
 149         mini_cm_set
 150 };
 151
 152 static struct nes_cm_core *g_cm_core;
 153
 154 atomic_t cm_connects;
 155 atomic_t cm_accepts;
 156 atomic_t cm_disconnects;
 157 atomic_t cm_closes;
 158 atomic_t cm_connecteds;
 159 atomic_t cm_connect_reqs;
 160 atomic_t cm_rejects;
 161
 162
 163 /**
 164  * create_event
 165  */
 166 static struct nes_cm_event *create_event(struct nes_cm_node *cm_node,
 167                 enum nes_cm_event_type type)
 168 {
 169         struct nes_cm_event *event;
 170
 171         if (!cm_node->cm_id)
 172                 return NULL;
 173
 174         /* allocate an empty event */
 175         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 176
 177         if (!event)
 178                 return NULL;
 179
 180         event->type = type;
 181         event->cm_node = cm_node;
 182         event->cm_info.rem_addr = cm_node->rem_addr;
 183         event->cm_info.loc_addr = cm_node->loc_addr;
 184         event->cm_info.rem_port = cm_node->rem_port;
 185         event->cm_info.loc_port = cm_node->loc_port;
 186         event->cm_info.cm_id = cm_node->cm_id;
 187
 188         nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
 189                 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
 190                 cm_node, event, type, event->cm_info.loc_addr,
 191                 event->cm_info.loc_port, event->cm_info.rem_addr,
 192                 event->cm_info.rem_port);
 193
 194         nes_cm_post_event(event);
 195         return event;
 196 }
 197
 198
 199 /**
 200  * send_mpa_request
 201  */
 202 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
 203 {
 204         if (!skb) {
 205                 nes_debug(NES_DBG_CM, "skb set to NULL\n");
 206                 return -1;
 207         }
 208
 209         /* send an MPA Request frame */
 210         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 211                         cm_node->mpa_frame_size, SET_ACK);
 212
 213         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 214 }
 215
 216
 217
 218 static int send_mpa_reject(struct nes_cm_node *cm_node)
 219 {
 220         struct sk_buff  *skb = NULL;
 221
 222         skb = dev_alloc_skb(MAX_CM_BUFFER);
 223         if (!skb) {
 224                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 225                 return -ENOMEM;
 226         }
 227
 228         /* send an MPA reject frame */
 229         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 230                         cm_node->mpa_frame_size, SET_ACK | SET_FIN);
 231
 232         cm_node->state = NES_CM_STATE_FIN_WAIT1;
 233         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 234 }
 235
 236
 237 /**
 238  * recv_mpa - process a received TCP pkt, we are expecting an
 239  * IETF MPA frame
 240  */
 241 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
 242                 u32 len)
 243 {
 244         struct ietf_mpa_frame *mpa_frame;
 245
 246         *type = NES_MPA_REQUEST_ACCEPT;
 247
 248         /* assume req frame is in tcp data payload */
 249         if (len < sizeof(struct ietf_mpa_frame)) {
 250                 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
 251                 return -EINVAL;
 252         }
 253
 254         mpa_frame = (struct ietf_mpa_frame *)buffer;
 255         cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
 256         /* make sure mpa private data len is less than 512 bytes */
 257         if (cm_node->mpa_frame_size > IETF_MAX_PRIV_DATA_LEN) {
 258                 nes_debug(NES_DBG_CM, "The received Length of Private"
 259                         " Data field exceeds 512 octets\n");
 260                 return -EINVAL;
 261         }
 262         /*
 263          * make sure MPA receiver interoperate with the
 264          * received MPA version and MPA key information
 265          *
 266          */
 267         if (mpa_frame->rev != mpa_version) {
 268                 nes_debug(NES_DBG_CM, "The received mpa version"
 269                                 " can not be interoperated\n");
 270                 return -EINVAL;
 271         }
 272         if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
 273                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
 274                         nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
 275                         return -EINVAL;
 276                 }
 277         } else {
 278                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
 279                         nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
 280                         return -EINVAL;
 281                 }
 282         }
 283
 284         if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
 285                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
 286                                 " complete (%x + %x != %x)\n",
 287                                 cm_node->mpa_frame_size,
 288                                 (u32)sizeof(struct ietf_mpa_frame), len);
 289                 return -EINVAL;
 290         }
 291         /* make sure it does not exceed the max size */
 292         if (len > MAX_CM_BUFFER) {
 293                 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
 294                                 " (%x + %x != %x)\n",
 295                                 cm_node->mpa_frame_size,
 296                                 (u32)sizeof(struct ietf_mpa_frame), len);
 297                 return -EINVAL;
 298         }
 299
 300         /* copy entire MPA frame to our cm_node's frame */
 301         memcpy(cm_node->mpa_frame_buf, buffer + sizeof(struct ietf_mpa_frame),
 302                         cm_node->mpa_frame_size);
 303
 304         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
 305                 *type = NES_MPA_REQUEST_REJECT;
 306         return 0;
 307 }
 308
 309
 310 /**
 311  * form_cm_frame - get a free packet and build empty frame Use
 312  * node info to build.
 313  */
 314 static void form_cm_frame(struct sk_buff *skb,
 315         struct nes_cm_node *cm_node, void *options, u32 optionsize,
 316         void *data, u32 datasize, u8 flags)
 317 {
 318         struct tcphdr *tcph;
 319         struct iphdr *iph;
 320         struct ethhdr *ethh;
 321         u8 *buf;
 322         u16 packetsize = sizeof(*iph);
 323
 324         packetsize += sizeof(*tcph);
 325         packetsize +=  optionsize + datasize;
 326
 327         memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
 328
 329         skb->len = 0;
 330         buf = skb_put(skb, packetsize + ETH_HLEN);
 331
 332         ethh = (struct ethhdr *) buf;
 333         buf += ETH_HLEN;
 334
 335         iph = (struct iphdr *)buf;
 336         buf += sizeof(*iph);
 337         tcph = (struct tcphdr *)buf;
 338         skb_reset_mac_header(skb);
 339         skb_set_network_header(skb, ETH_HLEN);
 340         skb_set_transport_header(skb, ETH_HLEN+sizeof(*iph));
 341         buf += sizeof(*tcph);
 342
 343         skb->ip_summed = CHECKSUM_PARTIAL;
 344         skb->protocol = htons(0x800);
 345         skb->data_len = 0;
 346         skb->mac_len = ETH_HLEN;
 347
 348         memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
 349         memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
 350         ethh->h_proto = htons(0x0800);
 351
 352         iph->version = IPVERSION;
 353         iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
 354         iph->tos = 0;
 355         iph->tot_len = htons(packetsize);
 356         iph->id = htons(++cm_node->tcp_cntxt.loc_id);
 357
 358         iph->frag_off = htons(0x4000);
 359         iph->ttl = 0x40;
 360         iph->protocol = 0x06;   /* IPPROTO_TCP */
 361
 362         iph->saddr = htonl(cm_node->loc_addr);
 363         iph->daddr = htonl(cm_node->rem_addr);
 364
 365         tcph->source = htons(cm_node->loc_port);
 366         tcph->dest = htons(cm_node->rem_port);
 367         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
 368
 369         if (flags & SET_ACK) {
 370                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
 371                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
 372                 tcph->ack = 1;
 373         } else
 374                 tcph->ack_seq = 0;
 375
 376         if (flags & SET_SYN) {
 377                 cm_node->tcp_cntxt.loc_seq_num++;
 378                 tcph->syn = 1;
 379         } else
 380                 cm_node->tcp_cntxt.loc_seq_num += datasize;
 381
 382         if (flags & SET_FIN) {
 383                 cm_node->tcp_cntxt.loc_seq_num++;
 384                 tcph->fin = 1;
 385         }
 386
 387         if (flags & SET_RST)
 388                 tcph->rst = 1;
 389
 390         tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
 391         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
 392         tcph->urg_ptr = 0;
 393         if (optionsize)
 394                 memcpy(buf, options, optionsize);
 395         buf += optionsize;
 396         if (datasize)
 397                 memcpy(buf, data, datasize);
 398
 399         skb_shinfo(skb)->nr_frags = 0;
 400         cm_packets_created++;
 401
 402 }
 403
 404
 405 /**
 406  * print_core - dump a cm core
 407  */
 408 static void print_core(struct nes_cm_core *core)
 409 {
 410         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 411         nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
 412         if (!core)
 413                 return;
 414         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 415
 416         nes_debug(NES_DBG_CM, "State         : %u \n",  core->state);
 417
 418         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
 419         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
 420
 421         nes_debug(NES_DBG_CM, "core          : %p \n", core);
 422
 423         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
 424 }
 425
 426
 427 /**
 428  * schedule_nes_timer
 429  * note - cm_node needs to be protected before calling this. Encase in:
 430  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 431  */
 432 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
 433                 enum nes_timer_type type, int send_retrans,
 434                 int close_when_complete)
 435 {
 436         unsigned long  flags;
 437         struct nes_cm_core *cm_core = cm_node->cm_core;
 438         struct nes_timer_entry *new_send;
 439         int ret = 0;
 440         u32 was_timer_set;
 441
 442         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
 443         if (!new_send)
 444                 return -ENOMEM;
 445
 446         /* new_send->timetosend = currenttime */
 447         new_send->retrycount = NES_DEFAULT_RETRYS;
 448         new_send->retranscount = NES_DEFAULT_RETRANS;
 449         new_send->skb = skb;
 450         new_send->timetosend = jiffies;
 451         new_send->type = type;
 452         new_send->netdev = cm_node->netdev;
 453         new_send->send_retrans = send_retrans;
 454         new_send->close_when_complete = close_when_complete;
 455
 456         if (type == NES_TIMER_TYPE_CLOSE) {
 457                 new_send->timetosend += (HZ/10);
 458                 if (cm_node->recv_entry) {
 459                         kfree(new_send);
 460                         WARN_ON(1);
 461                         return -EINVAL;
 462                 }
 463                 cm_node->recv_entry = new_send;
 464         }
 465
 466         if (type == NES_TIMER_TYPE_SEND) {
 467                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 468                 atomic_inc(&new_send->skb->users);
 469                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 470                 cm_node->send_entry = new_send;
 471                 add_ref_cm_node(cm_node);
 472                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 473                 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
 474
 475                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
 476                 if (ret != NETDEV_TX_OK) {
 477                         nes_debug(NES_DBG_CM, "Error sending packet %p "
 478                                 "(jiffies = %lu)\n", new_send, jiffies);
 479                         new_send->timetosend = jiffies;
 480                         ret = NETDEV_TX_OK;
 481                 } else {
 482                         cm_packets_sent++;
 483                         if (!send_retrans) {
 484                                 cleanup_retrans_entry(cm_node);
 485                                 if (close_when_complete)
 486                                         rem_ref_cm_node(cm_core, cm_node);
 487                                 return ret;
 488                         }
 489                 }
 490         }
 491
 492         was_timer_set = timer_pending(&cm_core->tcp_timer);
 493
 494         if (!was_timer_set) {
 495                 cm_core->tcp_timer.expires = new_send->timetosend;
 496                 add_timer(&cm_core->tcp_timer);
 497         }
 498
 499         return ret;
 500 }
 501
 502 static void nes_retrans_expired(struct nes_cm_node *cm_node)
 503 {
 504         struct iw_cm_id *cm_id = cm_node->cm_id;
 505         enum nes_cm_node_state state = cm_node->state;
 506         cm_node->state = NES_CM_STATE_CLOSED;
 507         switch (state) {
 508         case NES_CM_STATE_SYN_RCVD:
 509         case NES_CM_STATE_CLOSING:
 510                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 511                 break;
 512         case NES_CM_STATE_LAST_ACK:
 513         case NES_CM_STATE_FIN_WAIT1:
 514                 if (cm_node->cm_id)
 515                         cm_id->rem_ref(cm_id);
 516                 send_reset(cm_node, NULL);
 517                 break;
 518         default:
 519                 add_ref_cm_node(cm_node);
 520                 send_reset(cm_node, NULL);
 521                 create_event(cm_node, NES_CM_EVENT_ABORTED);
 522         }
 523 }
 524
 525 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
 526 {
 527         struct nes_timer_entry *recv_entry = cm_node->recv_entry;
 528         struct iw_cm_id *cm_id = cm_node->cm_id;
 529         struct nes_qp *nesqp;
 530         unsigned long qplockflags;
 531
 532         if (!recv_entry)
 533                 return;
 534         nesqp = (struct nes_qp *)recv_entry->skb;
 535         if (nesqp) {
 536                 spin_lock_irqsave(&nesqp->lock, qplockflags);
 537                 if (nesqp->cm_id) {
 538                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 539                                 "refcount = %d: HIT A "
 540                                 "NES_TIMER_TYPE_CLOSE with something "
 541                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 542                                 atomic_read(&nesqp->refcount));
 543                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
 544                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
 545                         nesqp->ibqp_state = IB_QPS_ERR;
 546                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 547                         nes_cm_disconn(nesqp);
 548                 } else {
 549                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 550                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 551                                 "refcount = %d: HIT A "
 552                                 "NES_TIMER_TYPE_CLOSE with nothing "
 553                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 554                                 atomic_read(&nesqp->refcount));
 555                 }
 556         } else if (rem_node) {
 557                 /* TIME_WAIT state */
 558                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 559         }
 560         if (cm_node->cm_id)
 561                 cm_id->rem_ref(cm_id);
 562         kfree(recv_entry);
 563         cm_node->recv_entry = NULL;
 564 }
 565
 566 /**
 567  * nes_cm_timer_tick
 568  */
 569 static void nes_cm_timer_tick(unsigned long pass)
 570 {
 571         unsigned long flags;
 572         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
 573         struct nes_cm_node *cm_node;
 574         struct nes_timer_entry *send_entry, *recv_entry;
 575         struct list_head *list_core_temp;
 576         struct list_head *list_node;
 577         struct nes_cm_core *cm_core = g_cm_core;
 578         u32 settimer = 0;
 579         unsigned long timetosend;
 580         int ret = NETDEV_TX_OK;
 581
 582         struct list_head timer_list;
 583         INIT_LIST_HEAD(&timer_list);
 584         spin_lock_irqsave(&cm_core->ht_lock, flags);
 585
 586         list_for_each_safe(list_node, list_core_temp,
 587                                 &cm_core->connected_nodes) {
 588                 cm_node = container_of(list_node, struct nes_cm_node, list);
 589                 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
 590                         add_ref_cm_node(cm_node);
 591                         list_add(&cm_node->timer_entry, &timer_list);
 592                 }
 593         }
 594         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 595
 596         list_for_each_safe(list_node, list_core_temp, &timer_list) {
 597                 cm_node = container_of(list_node, struct nes_cm_node,
 598                                         timer_entry);
 599                 recv_entry = cm_node->recv_entry;
 600
 601                 if (recv_entry) {
 602                         if (time_after(recv_entry->timetosend, jiffies)) {
 603                                 if (nexttimeout > recv_entry->timetosend ||
 604                                                 !settimer) {
 605                                         nexttimeout = recv_entry->timetosend;
 606                                         settimer = 1;
 607                                 }
 608                         } else
 609                                 handle_recv_entry(cm_node, 1);
 610                 }
 611
 612                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 613                 do {
 614                         send_entry = cm_node->send_entry;
 615                         if (!send_entry)
 616                                 break;
 617                         if (time_after(send_entry->timetosend, jiffies)) {
 618                                 if (cm_node->state != NES_CM_STATE_TSA) {
 619                                         if ((nexttimeout >
 620                                                 send_entry->timetosend) ||
 621                                                 !settimer) {
 622                                                 nexttimeout =
 623                                                         send_entry->timetosend;
 624                                                 settimer = 1;
 625                                         }
 626                                 } else {
 627                                         free_retrans_entry(cm_node);
 628                                 }
 629                                 break;
 630                         }
 631
 632                         if ((cm_node->state == NES_CM_STATE_TSA) ||
 633                                 (cm_node->state == NES_CM_STATE_CLOSED)) {
 634                                 free_retrans_entry(cm_node);
 635                                 break;
 636                         }
 637
 638                         if (!send_entry->retranscount ||
 639                                 !send_entry->retrycount) {
 640                                 cm_packets_dropped++;
 641                                 free_retrans_entry(cm_node);
 642
 643                                 spin_unlock_irqrestore(
 644                                         &cm_node->retrans_list_lock, flags);
 645                                 nes_retrans_expired(cm_node);
 646                                 cm_node->state = NES_CM_STATE_CLOSED;
 647                                 spin_lock_irqsave(&cm_node->retrans_list_lock,
 648                                         flags);
 649                                 break;
 650                         }
 651                         atomic_inc(&send_entry->skb->users);
 652                         cm_packets_retrans++;
 653                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
 654                                 "for node %p, jiffies = %lu, time to send = "
 655                                 "%lu, retranscount = %u, send_entry->seq_num = "
 656                                 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
 657                                 "0x%08X\n", send_entry, cm_node, jiffies,
 658                                 send_entry->timetosend,
 659                                 send_entry->retranscount,
 660                                 send_entry->seq_num,
 661                                 cm_node->tcp_cntxt.rem_ack_num);
 662
 663                         spin_unlock_irqrestore(&cm_node->retrans_list_lock,
 664                                 flags);
 665                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
 666                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 667                         if (ret != NETDEV_TX_OK) {
 668                                 nes_debug(NES_DBG_CM, "rexmit failed for "
 669                                         "node=%p\n", cm_node);
 670                                 cm_packets_bounced++;
 671                                 send_entry->retrycount--;
 672                                 nexttimeout = jiffies + NES_SHORT_TIME;
 673                                 settimer = 1;
 674                                 break;
 675                         } else {
 676                                 cm_packets_sent++;
 677                         }
 678                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
 679                                 "%u, retry count = %u.\n",
 680                                 send_entry->retranscount,
 681                                 send_entry->retrycount);
 682                         if (send_entry->send_retrans) {
 683                                 send_entry->retranscount--;
 684                                 timetosend = (NES_RETRY_TIMEOUT <<
 685                                         (NES_DEFAULT_RETRANS - send_entry->retranscount));
 686
 687                                 send_entry->timetosend = jiffies +
 688                                         min(timetosend, NES_MAX_TIMEOUT);
 689                                 if (nexttimeout > send_entry->timetosend ||
 690                                         !settimer) {
 691                                         nexttimeout = send_entry->timetosend;
 692                                         settimer = 1;
 693                                 }
 694                         } else {
 695                                 int close_when_complete;
 696                                 close_when_complete =
 697                                         send_entry->close_when_complete;
 698                                 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
 699                                         cm_node, cm_node->state);
 700                                 free_retrans_entry(cm_node);
 701                                 if (close_when_complete)
 702                                         rem_ref_cm_node(cm_node->cm_core,
 703                                                 cm_node);
 704                         }
 705                 } while (0);
 706
 707                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 708                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 709         }
 710
 711         if (settimer) {
 712                 if (!timer_pending(&cm_core->tcp_timer)) {
 713                         cm_core->tcp_timer.expires  = nexttimeout;
 714                         add_timer(&cm_core->tcp_timer);
 715                 }
 716         }
 717 }
 718
 719
 720 /**
 721  * send_syn
 722  */
 723 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
 724         struct sk_buff *skb)
 725 {
 726         int ret;
 727         int flags = SET_SYN;
 728         char optionsbuffer[sizeof(struct option_mss) +
 729                 sizeof(struct option_windowscale) + sizeof(struct option_base) +
 730                 TCP_OPTIONS_PADDING];
 731
 732         int optionssize = 0;
 733         /* Sending MSS option */
 734         union all_known_options *options;
 735
 736         if (!cm_node)
 737                 return -EINVAL;
 738
 739         options = (union all_known_options *)&optionsbuffer[optionssize];
 740         options->as_mss.optionnum = OPTION_NUMBER_MSS;
 741         options->as_mss.length = sizeof(struct option_mss);
 742         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
 743         optionssize += sizeof(struct option_mss);
 744
 745         options = (union all_known_options *)&optionsbuffer[optionssize];
 746         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
 747         options->as_windowscale.length = sizeof(struct option_windowscale);
 748         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
 749         optionssize += sizeof(struct option_windowscale);
 750
 751         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
 752                 options = (union all_known_options *)&optionsbuffer[optionssize];
 753                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
 754                 options->as_base.length = sizeof(struct option_base);
 755                 optionssize += sizeof(struct option_base);
 756                 /* we need the size to be a multiple of 4 */
 757                 options = (union all_known_options *)&optionsbuffer[optionssize];
 758                 options->as_end = 1;
 759                 optionssize += 1;
 760                 options = (union all_known_options *)&optionsbuffer[optionssize];
 761                 options->as_end = 1;
 762                 optionssize += 1;
 763         }
 764
 765         options = (union all_known_options *)&optionsbuffer[optionssize];
 766         options->as_end = OPTION_NUMBER_END;
 767         optionssize += 1;
 768
 769         if (!skb)
 770                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 771         if (!skb) {
 772                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 773                 return -1;
 774         }
 775
 776         if (sendack)
 777                 flags |= SET_ACK;
 778
 779         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
 780         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 781
 782         return ret;
 783 }
 784
 785
 786 /**
 787  * send_reset
 788  */
 789 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
 790 {
 791         int ret;
 792         int flags = SET_RST | SET_ACK;
 793
 794         if (!skb)
 795                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 796         if (!skb) {
 797                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 798                 return -ENOMEM;
 799         }
 800
 801         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
 802         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
 803
 804         return ret;
 805 }
 806
 807
 808 /**
 809  * send_ack
 810  */
 811 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
 812 {
 813         int ret;
 814
 815         if (!skb)
 816                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 817
 818         if (!skb) {
 819                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 820                 return -1;
 821         }
 822
 823         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
 824         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
 825
 826         return ret;
 827 }
 828
 829
 830 /**
 831  * send_fin
 832  */
 833 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
 834 {
 835         int ret;
 836
 837         /* if we didn't get a frame get one */
 838         if (!skb)
 839                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 840
 841         if (!skb) {
 842                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 843                 return -1;
 844         }
 845
 846         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
 847         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 848
 849         return ret;
 850 }
 851
 852
 853 /**
 854  * find_node - find a cm node that matches the reference cm node
 855  */
 856 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
 857                 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
 858 {
 859         unsigned long flags;
 860         struct list_head *hte;
 861         struct nes_cm_node *cm_node;
 862
 863         /* get a handle on the hte */
 864         hte = &cm_core->connected_nodes;
 865
 866         /* walk list and find cm_node associated with this session ID */
 867         spin_lock_irqsave(&cm_core->ht_lock, flags);
 868         list_for_each_entry(cm_node, hte, list) {
 869                 /* compare quad, return node handle if a match */
 870                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
 871                                 cm_node->loc_addr, cm_node->loc_port,
 872                                 loc_addr, loc_port,
 873                                 cm_node->rem_addr, cm_node->rem_port,
 874                                 rem_addr, rem_port);
 875                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
 876                                 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
 877                         add_ref_cm_node(cm_node);
 878                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 879                         return cm_node;
 880                 }
 881         }
 882         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 883
 884         /* no owner node */
 885         return NULL;
 886 }
 887
 888
 889 /**
 890  * find_listener - find a cm node listening on this addr-port pair
 891  */
 892 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
 893                 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
 894 {
 895         unsigned long flags;
 896         struct nes_cm_listener *listen_node;
 897
 898         /* walk list and find cm_node associated with this session ID */
 899         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 900         list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
 901                 /* compare node pair, return node handle if a match */
 902                 if (((listen_node->loc_addr == dst_addr) ||
 903                                 listen_node->loc_addr == 0x00000000) &&
 904                                 (listen_node->loc_port == dst_port) &&
 905                                 (listener_state & listen_node->listener_state)) {
 906                         atomic_inc(&listen_node->ref_count);
 907                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 908                         return listen_node;
 909                 }
 910         }
 911         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 912
 913         /* no listener */
 914         return NULL;
 915 }
 916
 917
 918 /**
 919  * add_hte_node - add a cm node to the hash table
 920  */
 921 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
 922 {
 923         unsigned long flags;
 924         struct list_head *hte;
 925
 926         if (!cm_node || !cm_core)
 927                 return -EINVAL;
 928
 929         nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
 930                 cm_node);
 931
 932         spin_lock_irqsave(&cm_core->ht_lock, flags);
 933
 934         /* get a handle on the hash table element (list head for this slot) */
 935         hte = &cm_core->connected_nodes;
 936         list_add_tail(&cm_node->list, hte);
 937         atomic_inc(&cm_core->ht_node_cnt);
 938
 939         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 940
 941         return 0;
 942 }
 943
 944
 945 /**
 946  * mini_cm_dec_refcnt_listen
 947  */
 948 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
 949         struct nes_cm_listener *listener, int free_hanging_nodes)
 950 {
 951         int ret = -EINVAL;
 952         int err = 0;
 953         unsigned long flags;
 954         struct list_head *list_pos = NULL;
 955         struct list_head *list_temp = NULL;
 956         struct nes_cm_node *cm_node = NULL;
 957         struct list_head reset_list;
 958
 959         nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
 960                 "refcnt=%d\n", listener, free_hanging_nodes,
 961                 atomic_read(&listener->ref_count));
 962         /* free non-accelerated child nodes for this listener */
 963         INIT_LIST_HEAD(&reset_list);
 964         if (free_hanging_nodes) {
 965                 spin_lock_irqsave(&cm_core->ht_lock, flags);
 966                 list_for_each_safe(list_pos, list_temp,
 967                                    &g_cm_core->connected_nodes) {
 968                         cm_node = container_of(list_pos, struct nes_cm_node,
 969                                 list);
 970                         if ((cm_node->listener == listener) &&
 971                             (!cm_node->accelerated)) {
 972                                 add_ref_cm_node(cm_node);
 973                                 list_add(&cm_node->reset_entry, &reset_list);
 974                         }
 975                 }
 976                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 977         }
 978
 979         list_for_each_safe(list_pos, list_temp, &reset_list) {
 980                 cm_node = container_of(list_pos, struct nes_cm_node,
 981                                 reset_entry);
 982                 {
 983                         struct nes_cm_node *loopback = cm_node->loopbackpartner;
 984                         enum nes_cm_node_state old_state;
 985                         if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
 986                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 987                         } else {
 988                                 if (!loopback) {
 989                                         cleanup_retrans_entry(cm_node);
 990                                         err = send_reset(cm_node, NULL);
 991                                         if (err) {
 992                                                 cm_node->state =
 993                                                          NES_CM_STATE_CLOSED;
 994                                                 WARN_ON(1);
 995                                         } else {
 996                                                 old_state = cm_node->state;
 997                                                 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
 998                                                 if (old_state != NES_CM_STATE_MPAREQ_RCVD)
 999                                                         rem_ref_cm_node(
1000                                                                 cm_node->cm_core,
1001                                                                 cm_node);
1002                                         }
1003                                 } else {
1004                                         struct nes_cm_event event;
1005
1006                                         event.cm_node = loopback;
1007                                         event.cm_info.rem_addr =
1008                                                         loopback->rem_addr;
1009                                         event.cm_info.loc_addr =
1010                                                         loopback->loc_addr;
1011                                         event.cm_info.rem_port =
1012                                                         loopback->rem_port;
1013                                         event.cm_info.loc_port =
1014                                                          loopback->loc_port;
1015                                         event.cm_info.cm_id = loopback->cm_id;
1016                                         add_ref_cm_node(loopback);
1017                                         loopback->state = NES_CM_STATE_CLOSED;
1018                                         cm_event_connect_error(&event);
1019                                         cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1020
1021                                         rem_ref_cm_node(cm_node->cm_core,
1022                                                          cm_node);
1023
1024                                 }
1025                         }
1026                 }
1027         }
1028
1029         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1030         if (!atomic_dec_return(&listener->ref_count)) {
1031                 list_del(&listener->list);
1032
1033                 /* decrement our listen node count */
1034                 atomic_dec(&cm_core->listen_node_cnt);
1035
1036                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1037
1038                 if (listener->nesvnic) {
1039                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
1040                                         PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
1041                 }
1042
1043                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1044
1045                 kfree(listener);
1046                 listener = NULL;
1047                 ret = 0;
1048                 atomic_inc(&cm_listens_destroyed);
1049         } else {
1050                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1051         }
1052         if (listener) {
1053                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1054                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
1055                                         " with non-zero pending accepts=%u\n",
1056                                         listener, atomic_read(&listener->pend_accepts_cnt));
1057         }
1058
1059         return ret;
1060 }
1061
1062
1063 /**
1064  * mini_cm_del_listen
1065  */
1066 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1067                 struct nes_cm_listener *listener)
1068 {
1069         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1070         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1071         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1072 }
1073
1074
1075 /**
1076  * mini_cm_accelerated
1077  */
1078 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1079                 struct nes_cm_node *cm_node)
1080 {
1081         u32 was_timer_set;
1082         cm_node->accelerated = 1;
1083
1084         if (cm_node->accept_pend) {
1085                 BUG_ON(!cm_node->listener);
1086                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1087                 cm_node->accept_pend = 0;
1088                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1089         }
1090
1091         was_timer_set = timer_pending(&cm_core->tcp_timer);
1092         if (!was_timer_set) {
1093                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1094                 add_timer(&cm_core->tcp_timer);
1095         }
1096
1097         return 0;
1098 }
1099
1100
1101 /**
1102  * nes_addr_resolve_neigh
1103  */
1104 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
1105 {
1106         struct rtable *rt;
1107         struct flowi fl;
1108         struct neighbour *neigh;
1109         int rc = arpindex;
1110         struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1111
1112         memset(&fl, 0, sizeof fl);
1113         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1114         if (ip_route_output_key(&init_net, &rt, &fl)) {
1115                 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1116                                 __func__, dst_ip);
1117                 return rc;
1118         }
1119
1120         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, nesvnic->netdev);
1121         if (neigh) {
1122                 if (neigh->nud_state & NUD_VALID) {
1123                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1124                                   " is %pM, Gateway is 0x%08X \n", dst_ip,
1125                                   neigh->ha, ntohl(rt->rt_gateway));
1126
1127                         if (arpindex >= 0) {
1128                                 if (!memcmp(nesadapter->arp_table[arpindex].mac_addr,
1129                                                         neigh->ha, ETH_ALEN)){
1130                                         /* Mac address same as in nes_arp_table */
1131                                         neigh_release(neigh);
1132                                         ip_rt_put(rt);
1133                                         return rc;
1134                                 }
1135
1136                                 nes_manage_arp_cache(nesvnic->netdev,
1137                                                 nesadapter->arp_table[arpindex].mac_addr,
1138                                                 dst_ip, NES_ARP_DELETE);
1139                         }
1140
1141                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1142                                              dst_ip, NES_ARP_ADD);
1143                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1144                                            NES_ARP_RESOLVE);
1145                 }
1146                 neigh_release(neigh);
1147         }
1148
1149         if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
1150                 neigh_event_send(rt->dst.neighbour, NULL);
1151
1152         ip_rt_put(rt);
1153         return rc;
1154 }
1155
1156 /**
1157  * make_cm_node - create a new instance of a cm node
1158  */
1159 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1160                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1161                 struct nes_cm_listener *listener)
1162 {
1163         struct nes_cm_node *cm_node;
1164         struct timespec ts;
1165         int oldarpindex = 0;
1166         int arpindex = 0;
1167         struct nes_device *nesdev;
1168         struct nes_adapter *nesadapter;
1169
1170         /* create an hte and cm_node for this instance */
1171         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1172         if (!cm_node)
1173                 return NULL;
1174
1175         /* set our node specific transport info */
1176         cm_node->loc_addr = cm_info->loc_addr;
1177         cm_node->rem_addr = cm_info->rem_addr;
1178         cm_node->loc_port = cm_info->loc_port;
1179         cm_node->rem_port = cm_info->rem_port;
1180         cm_node->send_write0 = send_first;
1181         nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1182                   &cm_node->loc_addr, cm_node->loc_port,
1183                   &cm_node->rem_addr, cm_node->rem_port);
1184         cm_node->listener = listener;
1185         cm_node->netdev = nesvnic->netdev;
1186         cm_node->cm_id = cm_info->cm_id;
1187         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1188
1189         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1190                         cm_node->cm_id);
1191
1192         spin_lock_init(&cm_node->retrans_list_lock);
1193
1194         cm_node->loopbackpartner = NULL;
1195         atomic_set(&cm_node->ref_count, 1);
1196         /* associate our parent CM core */
1197         cm_node->cm_core = cm_core;
1198         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1199         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1200         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1201                         NES_CM_DEFAULT_RCV_WND_SCALE;
1202         ts = current_kernel_time();
1203         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1204         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1205                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1206         cm_node->tcp_cntxt.rcv_nxt = 0;
1207         /* get a unique session ID , add thread_id to an upcounter to handle race */
1208         atomic_inc(&cm_core->node_cnt);
1209         cm_node->conn_type = cm_info->conn_type;
1210         cm_node->apbvt_set = 0;
1211         cm_node->accept_pend = 0;
1212
1213         cm_node->nesvnic = nesvnic;
1214         /* get some device handles, for arp lookup */
1215         nesdev = nesvnic->nesdev;
1216         nesadapter = nesdev->nesadapter;
1217
1218         cm_node->loopbackpartner = NULL;
1219
1220         /* get the mac addr for the remote node */
1221         if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
1222                 arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1223         else {
1224                 oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1225                 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr, oldarpindex);
1226
1227         }
1228         if (arpindex < 0) {
1229                 kfree(cm_node);
1230                 return NULL;
1231         }
1232
1233         /* copy the mac addr to node context */
1234         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1235         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1236                   cm_node->rem_mac);
1237
1238         add_hte_node(cm_core, cm_node);
1239         atomic_inc(&cm_nodes_created);
1240
1241         return cm_node;
1242 }
1243
1244
1245 /**
1246  * add_ref_cm_node - destroy an instance of a cm node
1247  */
1248 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1249 {
1250         atomic_inc(&cm_node->ref_count);
1251         return 0;
1252 }
1253
1254
1255 /**
1256  * rem_ref_cm_node - destroy an instance of a cm node
1257  */
1258 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1259         struct nes_cm_node *cm_node)
1260 {
1261         unsigned long flags;
1262         struct nes_qp *nesqp;
1263
1264         if (!cm_node)
1265                 return -EINVAL;
1266
1267         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1268         if (atomic_dec_return(&cm_node->ref_count)) {
1269                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1270                 return 0;
1271         }
1272         list_del(&cm_node->list);
1273         atomic_dec(&cm_core->ht_node_cnt);
1274         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1275
1276         /* if the node is destroyed before connection was accelerated */
1277         if (!cm_node->accelerated && cm_node->accept_pend) {
1278                 BUG_ON(!cm_node->listener);
1279                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1280                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1281         }
1282         WARN_ON(cm_node->send_entry);
1283         if (cm_node->recv_entry)
1284                 handle_recv_entry(cm_node, 0);
1285         if (cm_node->listener) {
1286                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1287         } else {
1288                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1289                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1290                                 PCI_FUNC(
1291                                 cm_node->nesvnic->nesdev->pcidev->devfn),
1292                                 NES_MANAGE_APBVT_DEL);
1293                 }
1294         }
1295
1296         atomic_dec(&cm_core->node_cnt);
1297         atomic_inc(&cm_nodes_destroyed);
1298         nesqp = cm_node->nesqp;
1299         if (nesqp) {
1300                 nesqp->cm_node = NULL;
1301                 nes_rem_ref(&nesqp->ibqp);
1302                 cm_node->nesqp = NULL;
1303         }
1304
1305         kfree(cm_node);
1306         return 0;
1307 }
1308
1309 /**
1310  * process_options
1311  */
1312 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1313         u32 optionsize, u32 syn_packet)
1314 {
1315         u32 tmp;
1316         u32 offset = 0;
1317         union all_known_options *all_options;
1318         char got_mss_option = 0;
1319
1320         while (offset < optionsize) {
1321                 all_options = (union all_known_options *)(optionsloc + offset);
1322                 switch (all_options->as_base.optionnum) {
1323                 case OPTION_NUMBER_END:
1324                         offset = optionsize;
1325                         break;
1326                 case OPTION_NUMBER_NONE:
1327                         offset += 1;
1328                         continue;
1329                 case OPTION_NUMBER_MSS:
1330                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1331                                 "Size: %d\n", __func__,
1332                                 all_options->as_mss.length, offset, optionsize);
1333                         got_mss_option = 1;
1334                         if (all_options->as_mss.length != 4) {
1335                                 return 1;
1336                         } else {
1337                                 tmp = ntohs(all_options->as_mss.mss);
1338                                 if (tmp > 0 && tmp <
1339                                         cm_node->tcp_cntxt.mss)
1340                                         cm_node->tcp_cntxt.mss = tmp;
1341                         }
1342                         break;
1343                 case OPTION_NUMBER_WINDOW_SCALE:
1344                         cm_node->tcp_cntxt.snd_wscale =
1345                                 all_options->as_windowscale.shiftcount;
1346                         break;
1347                 case OPTION_NUMBER_WRITE0:
1348                         cm_node->send_write0 = 1;
1349                         break;
1350                 default:
1351                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1352                                 all_options->as_base.optionnum);
1353                         break;
1354                 }
1355                 offset += all_options->as_base.length;
1356         }
1357         if ((!got_mss_option) && (syn_packet))
1358                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1359         return 0;
1360 }
1361
1362 static void drop_packet(struct sk_buff *skb)
1363 {
1364         atomic_inc(&cm_accel_dropped_pkts);
1365         dev_kfree_skb_any(skb);
1366 }
1367
1368 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1369 {
1370         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1371                 "refcnt=%d\n", cm_node, cm_node->state,
1372                 atomic_read(&cm_node->ref_count));
1373         switch (cm_node->state) {
1374         case NES_CM_STATE_SYN_RCVD:
1375         case NES_CM_STATE_SYN_SENT:
1376         case NES_CM_STATE_ESTABLISHED:
1377         case NES_CM_STATE_MPAREJ_RCVD:
1378                 cm_node->tcp_cntxt.rcv_nxt++;
1379                 cleanup_retrans_entry(cm_node);
1380                 cm_node->state = NES_CM_STATE_LAST_ACK;
1381                 send_fin(cm_node, NULL);
1382                 break;
1383         case NES_CM_STATE_MPAREQ_SENT:
1384                 create_event(cm_node, NES_CM_EVENT_ABORTED);
1385                 cm_node->tcp_cntxt.rcv_nxt++;
1386                 cleanup_retrans_entry(cm_node);
1387                 cm_node->state = NES_CM_STATE_CLOSED;
1388                 add_ref_cm_node(cm_node);
1389                 send_reset(cm_node, NULL);
1390                 break;
1391         case NES_CM_STATE_FIN_WAIT1:
1392                 cm_node->tcp_cntxt.rcv_nxt++;
1393                 cleanup_retrans_entry(cm_node);
1394                 cm_node->state = NES_CM_STATE_CLOSING;
1395                 send_ack(cm_node, NULL);
1396                 /* Wait for ACK as this is simultanous close..
1397                 * After we receive ACK, do not send anything..
1398                 * Just rm the node.. Done.. */
1399                 break;
1400         case NES_CM_STATE_FIN_WAIT2:
1401                 cm_node->tcp_cntxt.rcv_nxt++;
1402                 cleanup_retrans_entry(cm_node);
1403                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1404                 send_ack(cm_node, NULL);
1405                 schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
1406                 break;
1407         case NES_CM_STATE_TIME_WAIT:
1408                 cm_node->tcp_cntxt.rcv_nxt++;
1409                 cleanup_retrans_entry(cm_node);
1410                 cm_node->state = NES_CM_STATE_CLOSED;
1411                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1412                 break;
1413         case NES_CM_STATE_TSA:
1414         default:
1415                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1416                         cm_node, cm_node->state);
1417                 break;
1418         }
1419 }
1420
1421
1422 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1423         struct tcphdr *tcph)
1424 {
1425
1426         int     reset = 0;      /* whether to send reset in case of err.. */
1427         int     passive_state;
1428         atomic_inc(&cm_resets_recvd);
1429         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1430                         " refcnt=%d\n", cm_node, cm_node->state,
1431                         atomic_read(&cm_node->ref_count));
1432         cleanup_retrans_entry(cm_node);
1433         switch (cm_node->state) {
1434         case NES_CM_STATE_SYN_SENT:
1435         case NES_CM_STATE_MPAREQ_SENT:
1436                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1437                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1438                         cm_node->listener, cm_node->state);
1439                 active_open_err(cm_node, skb, reset);
1440                 break;
1441         case NES_CM_STATE_MPAREQ_RCVD:
1442                 passive_state = atomic_add_return(1, &cm_node->passive_state);
1443                 dev_kfree_skb_any(skb);
1444                 break;
1445         case NES_CM_STATE_ESTABLISHED:
1446         case NES_CM_STATE_SYN_RCVD:
1447         case NES_CM_STATE_LISTENING:
1448                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1449                 passive_open_err(cm_node, skb, reset);
1450                 break;
1451         case NES_CM_STATE_TSA:
1452                 active_open_err(cm_node, skb, reset);
1453                 break;
1454         case NES_CM_STATE_CLOSED:
1455                 drop_packet(skb);
1456                 break;
1457         case NES_CM_STATE_FIN_WAIT2:
1458         case NES_CM_STATE_FIN_WAIT1:
1459         case NES_CM_STATE_LAST_ACK:
1460                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1461         case NES_CM_STATE_TIME_WAIT:
1462                 cm_node->state = NES_CM_STATE_CLOSED;
1463                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1464                 drop_packet(skb);
1465                 break;
1466         default:
1467                 drop_packet(skb);
1468                 break;
1469         }
1470 }
1471
1472
1473 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1474 {
1475
1476         int     ret = 0;
1477         int datasize = skb->len;
1478         u8 *dataloc = skb->data;
1479
1480         enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1481         u32     res_type;
1482         ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1483         if (ret) {
1484                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1485                 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1486                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1487                                 "cm_node=%p listener=%p state=%d\n", __func__,
1488                                 __LINE__, cm_node, cm_node->listener,
1489                                 cm_node->state);
1490                         active_open_err(cm_node, skb, 1);
1491                 } else {
1492                         passive_open_err(cm_node, skb, 1);
1493                 }
1494                 return;
1495         }
1496
1497         switch (cm_node->state) {
1498         case NES_CM_STATE_ESTABLISHED:
1499                 if (res_type == NES_MPA_REQUEST_REJECT) {
1500                         /*BIG problem as we are receiving the MPA.. So should
1501                         * not be REJECT.. This is Passive Open.. We can
1502                         * only receive it Reject for Active Open...*/
1503                         WARN_ON(1);
1504                 }
1505                 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1506                 type = NES_CM_EVENT_MPA_REQ;
1507                 atomic_set(&cm_node->passive_state,
1508                                 NES_PASSIVE_STATE_INDICATED);
1509                 break;
1510         case NES_CM_STATE_MPAREQ_SENT:
1511                 cleanup_retrans_entry(cm_node);
1512                 if (res_type == NES_MPA_REQUEST_REJECT) {
1513                         type = NES_CM_EVENT_MPA_REJECT;
1514                         cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1515                 } else {
1516                         type = NES_CM_EVENT_CONNECTED;
1517                         cm_node->state = NES_CM_STATE_TSA;
1518                 }
1519
1520                 break;
1521         default:
1522                 WARN_ON(1);
1523                 break;
1524         }
1525         dev_kfree_skb_any(skb);
1526         create_event(cm_node, type);
1527 }
1528
1529 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1530 {
1531         switch (cm_node->state) {
1532         case NES_CM_STATE_SYN_SENT:
1533         case NES_CM_STATE_MPAREQ_SENT:
1534                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1535                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1536                         cm_node->listener, cm_node->state);
1537                 active_open_err(cm_node, skb, 1);
1538                 break;
1539         case NES_CM_STATE_ESTABLISHED:
1540         case NES_CM_STATE_SYN_RCVD:
1541                 passive_open_err(cm_node, skb, 1);
1542                 break;
1543         case NES_CM_STATE_TSA:
1544         default:
1545                 drop_packet(skb);
1546         }
1547 }
1548
1549 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1550         struct sk_buff *skb)
1551 {
1552         int err;
1553
1554         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1555         if (err)
1556                 active_open_err(cm_node, skb, 1);
1557
1558         return err;
1559 }
1560
1561 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1562         struct sk_buff *skb)
1563 {
1564         int err = 0;
1565         u32 seq;
1566         u32 ack_seq;
1567         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1568         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1569         u32 rcv_wnd;
1570         seq = ntohl(tcph->seq);
1571         ack_seq = ntohl(tcph->ack_seq);
1572         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1573         if (ack_seq != loc_seq_num)
1574                 err = 1;
1575         else if (!between(seq, rcv_nxt, (rcv_nxt+rcv_wnd)))
1576                 err = 1;
1577         if (err) {
1578                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1579                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1580                         cm_node->listener, cm_node->state);
1581                 indicate_pkt_err(cm_node, skb);
1582                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1583                         "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1584                         rcv_wnd);
1585         }
1586         return err;
1587 }
1588
1589 /*
1590  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1591  * is created with a listener or it may comein as rexmitted packet which in
1592  * that case will be just dropped.
1593  */
1594
1595 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1596         struct tcphdr *tcph)
1597 {
1598         int ret;
1599         u32 inc_sequence;
1600         int optionsize;
1601
1602         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1603         skb_trim(skb, 0);
1604         inc_sequence = ntohl(tcph->seq);
1605
1606         switch (cm_node->state) {
1607         case NES_CM_STATE_SYN_SENT:
1608         case NES_CM_STATE_MPAREQ_SENT:
1609                 /* Rcvd syn on active open connection*/
1610                 active_open_err(cm_node, skb, 1);
1611                 break;
1612         case NES_CM_STATE_LISTENING:
1613                 /* Passive OPEN */
1614                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1615                                 cm_node->listener->backlog) {
1616                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1617                                 "pressure \n");
1618                         cm_backlog_drops++;
1619                         passive_open_err(cm_node, skb, 0);
1620                         break;
1621                 }
1622                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1623                         1);
1624                 if (ret) {
1625                         passive_open_err(cm_node, skb, 0);
1626                         /* drop pkt */
1627                         break;
1628                 }
1629                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1630                 BUG_ON(cm_node->send_entry);
1631                 cm_node->accept_pend = 1;
1632                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1633
1634                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1635                 send_syn(cm_node, 1, skb);
1636                 break;
1637         case NES_CM_STATE_CLOSED:
1638                 cleanup_retrans_entry(cm_node);
1639                 add_ref_cm_node(cm_node);
1640                 send_reset(cm_node, skb);
1641                 break;
1642         case NES_CM_STATE_TSA:
1643         case NES_CM_STATE_ESTABLISHED:
1644         case NES_CM_STATE_FIN_WAIT1:
1645         case NES_CM_STATE_FIN_WAIT2:
1646         case NES_CM_STATE_MPAREQ_RCVD:
1647         case NES_CM_STATE_LAST_ACK:
1648         case NES_CM_STATE_CLOSING:
1649         case NES_CM_STATE_UNKNOWN:
1650         default:
1651                 drop_packet(skb);
1652                 break;
1653         }
1654 }
1655
1656 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1657         struct tcphdr *tcph)
1658 {
1659
1660         int ret;
1661         u32 inc_sequence;
1662         int optionsize;
1663
1664         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1665         skb_trim(skb, 0);
1666         inc_sequence = ntohl(tcph->seq);
1667         switch (cm_node->state) {
1668         case NES_CM_STATE_SYN_SENT:
1669                 cleanup_retrans_entry(cm_node);
1670                 /* active open */
1671                 if (check_syn(cm_node, tcph, skb))
1672                         return;
1673                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1674                 /* setup options */
1675                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1676                 if (ret) {
1677                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1678                                 cm_node);
1679                         break;
1680                 }
1681                 cleanup_retrans_entry(cm_node);
1682                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1683                 send_mpa_request(cm_node, skb);
1684                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1685                 break;
1686         case NES_CM_STATE_MPAREQ_RCVD:
1687                 /* passive open, so should not be here */
1688                 passive_open_err(cm_node, skb, 1);
1689                 break;
1690         case NES_CM_STATE_LISTENING:
1691                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1692                 cleanup_retrans_entry(cm_node);
1693                 cm_node->state = NES_CM_STATE_CLOSED;
1694                 send_reset(cm_node, skb);
1695                 break;
1696         case NES_CM_STATE_CLOSED:
1697                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1698                 cleanup_retrans_entry(cm_node);
1699                 add_ref_cm_node(cm_node);
1700                 send_reset(cm_node, skb);
1701                 break;
1702         case NES_CM_STATE_ESTABLISHED:
1703         case NES_CM_STATE_FIN_WAIT1:
1704         case NES_CM_STATE_FIN_WAIT2:
1705         case NES_CM_STATE_LAST_ACK:
1706         case NES_CM_STATE_TSA:
1707         case NES_CM_STATE_CLOSING:
1708         case NES_CM_STATE_UNKNOWN:
1709         case NES_CM_STATE_MPAREQ_SENT:
1710         default:
1711                 drop_packet(skb);
1712                 break;
1713         }
1714 }
1715
1716 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1717         struct tcphdr *tcph)
1718 {
1719         int datasize = 0;
1720         u32 inc_sequence;
1721         int ret = 0;
1722         int optionsize;
1723         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1724
1725         if (check_seq(cm_node, tcph, skb))
1726                 return -EINVAL;
1727
1728         skb_pull(skb, tcph->doff << 2);
1729         inc_sequence = ntohl(tcph->seq);
1730         datasize = skb->len;
1731         switch (cm_node->state) {
1732         case NES_CM_STATE_SYN_RCVD:
1733                 /* Passive OPEN */
1734                 cleanup_retrans_entry(cm_node);
1735                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1736                 if (ret)
1737                         break;
1738                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1739                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1740                 if (datasize) {
1741                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1742                         handle_rcv_mpa(cm_node, skb);
1743                 } else  /* rcvd ACK only */
1744                         dev_kfree_skb_any(skb);
1745                 break;
1746         case NES_CM_STATE_ESTABLISHED:
1747                 /* Passive OPEN */
1748                 cleanup_retrans_entry(cm_node);
1749                 if (datasize) {
1750                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1751                         handle_rcv_mpa(cm_node, skb);
1752                 } else
1753                         drop_packet(skb);
1754                 break;
1755         case NES_CM_STATE_MPAREQ_SENT:
1756                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1757                 if (datasize) {
1758                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1759                         handle_rcv_mpa(cm_node, skb);
1760                 } else  /* Could be just an ack pkt.. */
1761                         dev_kfree_skb_any(skb);
1762                 break;
1763         case NES_CM_STATE_LISTENING:
1764                 cleanup_retrans_entry(cm_node);
1765                 cm_node->state = NES_CM_STATE_CLOSED;
1766                 send_reset(cm_node, skb);
1767                 break;
1768         case NES_CM_STATE_CLOSED:
1769                 cleanup_retrans_entry(cm_node);
1770                 add_ref_cm_node(cm_node);
1771                 send_reset(cm_node, skb);
1772                 break;
1773         case NES_CM_STATE_LAST_ACK:
1774         case NES_CM_STATE_CLOSING:
1775                 cleanup_retrans_entry(cm_node);
1776                 cm_node->state = NES_CM_STATE_CLOSED;
1777                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1778                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1779                 drop_packet(skb);
1780                 break;
1781         case NES_CM_STATE_FIN_WAIT1:
1782                 cleanup_retrans_entry(cm_node);
1783                 drop_packet(skb);
1784                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1785                 break;
1786         case NES_CM_STATE_SYN_SENT:
1787         case NES_CM_STATE_FIN_WAIT2:
1788         case NES_CM_STATE_TSA:
1789         case NES_CM_STATE_MPAREQ_RCVD:
1790         case NES_CM_STATE_UNKNOWN:
1791         default:
1792                 cleanup_retrans_entry(cm_node);
1793                 drop_packet(skb);
1794                 break;
1795         }
1796         return ret;
1797 }
1798
1799
1800
1801 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1802         struct sk_buff *skb, int optionsize, int passive)
1803 {
1804         u8 *optionsloc = (u8 *)&tcph[1];
1805         if (optionsize) {
1806                 if (process_options(cm_node, optionsloc, optionsize,
1807                         (u32)tcph->syn)) {
1808                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
1809                                 __func__, cm_node);
1810                         if (passive)
1811                                 passive_open_err(cm_node, skb, 1);
1812                         else
1813                                 active_open_err(cm_node, skb, 1);
1814                         return 1;
1815                 }
1816         }
1817
1818         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1819                         cm_node->tcp_cntxt.snd_wscale;
1820
1821         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1822                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1823         return 0;
1824 }
1825
1826 /*
1827  * active_open_err() will send reset() if flag set..
1828  * It will also send ABORT event.
1829  */
1830
1831 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1832         int reset)
1833 {
1834         cleanup_retrans_entry(cm_node);
1835         if (reset) {
1836                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
1837                                 "state=%d\n", cm_node, cm_node->state);
1838                 add_ref_cm_node(cm_node);
1839                 send_reset(cm_node, skb);
1840         } else
1841                 dev_kfree_skb_any(skb);
1842
1843         cm_node->state = NES_CM_STATE_CLOSED;
1844         create_event(cm_node, NES_CM_EVENT_ABORTED);
1845 }
1846
1847 /*
1848  * passive_open_err() will either do a reset() or will free up the skb and
1849  * remove the cm_node.
1850  */
1851
1852 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1853         int reset)
1854 {
1855         cleanup_retrans_entry(cm_node);
1856         cm_node->state = NES_CM_STATE_CLOSED;
1857         if (reset) {
1858                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
1859                         "cm_node=%p state =%d\n", cm_node, cm_node->state);
1860                 send_reset(cm_node, skb);
1861         } else {
1862                 dev_kfree_skb_any(skb);
1863                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1864         }
1865 }
1866
1867 /*
1868  * free_retrans_entry() routines assumes that the retrans_list_lock has
1869  * been acquired before calling.
1870  */
1871 static void free_retrans_entry(struct nes_cm_node *cm_node)
1872 {
1873         struct nes_timer_entry *send_entry;
1874         send_entry = cm_node->send_entry;
1875         if (send_entry) {
1876                 cm_node->send_entry = NULL;
1877                 dev_kfree_skb_any(send_entry->skb);
1878                 kfree(send_entry);
1879                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1880         }
1881 }
1882
1883 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
1884 {
1885         unsigned long flags;
1886
1887         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1888         free_retrans_entry(cm_node);
1889         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1890 }
1891
1892 /**
1893  * process_packet
1894  * Returns skb if to be freed, else it will return NULL if already used..
1895  */
1896 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1897         struct nes_cm_core *cm_core)
1898 {
1899         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
1900         struct tcphdr *tcph = tcp_hdr(skb);
1901         u32     fin_set = 0;
1902         int ret = 0;
1903         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1904
1905         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1906                 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1907                 tcph->ack, tcph->rst, tcph->fin);
1908
1909         if (tcph->rst)
1910                 pkt_type = NES_PKT_TYPE_RST;
1911         else if (tcph->syn) {
1912                 pkt_type = NES_PKT_TYPE_SYN;
1913                 if (tcph->ack)
1914                         pkt_type = NES_PKT_TYPE_SYNACK;
1915         } else if (tcph->ack)
1916                 pkt_type = NES_PKT_TYPE_ACK;
1917         if (tcph->fin)
1918                 fin_set = 1;
1919
1920         switch (pkt_type) {
1921         case NES_PKT_TYPE_SYN:
1922                 handle_syn_pkt(cm_node, skb, tcph);
1923                 break;
1924         case NES_PKT_TYPE_SYNACK:
1925                 handle_synack_pkt(cm_node, skb, tcph);
1926                 break;
1927         case NES_PKT_TYPE_ACK:
1928                 ret = handle_ack_pkt(cm_node, skb, tcph);
1929                 if (fin_set && !ret)
1930                         handle_fin_pkt(cm_node);
1931                 break;
1932         case NES_PKT_TYPE_RST:
1933                 handle_rst_pkt(cm_node, skb, tcph);
1934                 break;
1935         default:
1936                 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
1937                         handle_fin_pkt(cm_node);
1938                 drop_packet(skb);
1939                 break;
1940         }
1941 }
1942
1943 /**
1944  * mini_cm_listen - create a listen node with params
1945  */
1946 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1947         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1948 {
1949         struct nes_cm_listener *listener;
1950         unsigned long flags;
1951
1952         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1953                 cm_info->loc_addr, cm_info->loc_port);
1954
1955         /* cannot have multiple matching listeners */
1956         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1957                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1958         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1959                 /* find automatically incs ref count ??? */
1960                 atomic_dec(&listener->ref_count);
1961                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1962                 return NULL;
1963         }
1964
1965         if (!listener) {
1966                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1967                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1968                 if (!listener) {
1969                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1970                         return NULL;
1971                 }
1972
1973                 listener->loc_addr = htonl(cm_info->loc_addr);
1974                 listener->loc_port = htons(cm_info->loc_port);
1975                 listener->reused_node = 0;
1976
1977                 atomic_set(&listener->ref_count, 1);
1978         }
1979         /* pasive case */
1980         /* find already inc'ed the ref count */
1981         else {
1982                 listener->reused_node = 1;
1983         }
1984
1985         listener->cm_id = cm_info->cm_id;
1986         atomic_set(&listener->pend_accepts_cnt, 0);
1987         listener->cm_core = cm_core;
1988         listener->nesvnic = nesvnic;
1989         atomic_inc(&cm_core->node_cnt);
1990
1991         listener->conn_type = cm_info->conn_type;
1992         listener->backlog = cm_info->backlog;
1993         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1994
1995         if (!listener->reused_node) {
1996                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1997                 list_add(&listener->list, &cm_core->listen_list.list);
1998                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1999                 atomic_inc(&cm_core->listen_node_cnt);
2000         }
2001
2002         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
2003                         " listener = %p, backlog = %d, cm_id = %p.\n",
2004                         cm_info->loc_addr, cm_info->loc_port,
2005                         listener, listener->backlog, listener->cm_id);
2006
2007         return listener;
2008 }
2009
2010
2011 /**
2012  * mini_cm_connect - make a connection node with params
2013  */
2014 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2015         struct nes_vnic *nesvnic, u16 private_data_len,
2016         void *private_data, struct nes_cm_info *cm_info)
2017 {
2018         int ret = 0;
2019         struct nes_cm_node *cm_node;
2020         struct nes_cm_listener *loopbackremotelistener;
2021         struct nes_cm_node *loopbackremotenode;
2022         struct nes_cm_info loopback_cm_info;
2023         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
2024         struct ietf_mpa_frame *mpa_frame = NULL;
2025
2026         /* create a CM connection node */
2027         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2028         if (!cm_node)
2029                 return NULL;
2030         mpa_frame = &cm_node->mpa_frame;
2031         memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
2032         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
2033         mpa_frame->rev =  IETF_MPA_VERSION;
2034         mpa_frame->priv_data_len = htons(private_data_len);
2035
2036         /* set our node side to client (active) side */
2037         cm_node->tcp_cntxt.client = 1;
2038         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2039
2040         if (cm_info->loc_addr == cm_info->rem_addr) {
2041                 loopbackremotelistener = find_listener(cm_core,
2042                                 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
2043                                 NES_CM_LISTENER_ACTIVE_STATE);
2044                 if (loopbackremotelistener == NULL) {
2045                         create_event(cm_node, NES_CM_EVENT_ABORTED);
2046                 } else {
2047                         loopback_cm_info = *cm_info;
2048                         loopback_cm_info.loc_port = cm_info->rem_port;
2049                         loopback_cm_info.rem_port = cm_info->loc_port;
2050                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2051                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
2052                                 &loopback_cm_info, loopbackremotelistener);
2053                         if (!loopbackremotenode) {
2054                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2055                                 return NULL;
2056                         }
2057                         atomic_inc(&cm_loopbacks);
2058                         loopbackremotenode->loopbackpartner = cm_node;
2059                         loopbackremotenode->tcp_cntxt.rcv_wscale =
2060                                 NES_CM_DEFAULT_RCV_WND_SCALE;
2061                         cm_node->loopbackpartner = loopbackremotenode;
2062                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2063                                 private_data_len);
2064                         loopbackremotenode->mpa_frame_size = private_data_len;
2065
2066                         /* we are done handling this state. */
2067                         /* set node to a TSA state */
2068                         cm_node->state = NES_CM_STATE_TSA;
2069                         cm_node->tcp_cntxt.rcv_nxt =
2070                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
2071                         loopbackremotenode->tcp_cntxt.rcv_nxt =
2072                                 cm_node->tcp_cntxt.loc_seq_num;
2073                         cm_node->tcp_cntxt.max_snd_wnd =
2074                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2075                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
2076                                 cm_node->tcp_cntxt.rcv_wnd;
2077                         cm_node->tcp_cntxt.snd_wnd =
2078                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2079                         loopbackremotenode->tcp_cntxt.snd_wnd =
2080                                 cm_node->tcp_cntxt.rcv_wnd;
2081                         cm_node->tcp_cntxt.snd_wscale =
2082                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
2083                         loopbackremotenode->tcp_cntxt.snd_wscale =
2084                                 cm_node->tcp_cntxt.rcv_wscale;
2085                         loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2086                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2087                 }
2088                 return cm_node;
2089         }
2090
2091         /* set our node side to client (active) side */
2092         cm_node->tcp_cntxt.client = 1;
2093         /* init our MPA frame ptr */
2094         memcpy(mpa_frame->priv_data, private_data, private_data_len);
2095
2096         cm_node->mpa_frame_size = mpa_frame_size;
2097
2098         /* send a syn and goto syn sent state */
2099         cm_node->state = NES_CM_STATE_SYN_SENT;
2100         ret = send_syn(cm_node, 0, NULL);
2101
2102         if (ret) {
2103                 /* error in sending the syn free up the cm_node struct */
2104                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2105                         "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2106                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2107                         cm_node->cm_id);
2108                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2109                 cm_node = NULL;
2110         }
2111
2112         if (cm_node)
2113                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2114                         "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2115                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2116                         cm_node->cm_id);
2117
2118         return cm_node;
2119 }
2120
2121
2122 /**
2123  * mini_cm_accept - accept a connection
2124  * This function is never called
2125  */
2126 static int mini_cm_accept(struct nes_cm_core *cm_core,
2127         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2128 {
2129         return 0;
2130 }
2131
2132
2133 /**
2134  * mini_cm_reject - reject and teardown a connection
2135  */
2136 static int mini_cm_reject(struct nes_cm_core *cm_core,
2137         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2138 {
2139         int ret = 0;
2140         int err = 0;
2141         int passive_state;
2142         struct nes_cm_event event;
2143         struct iw_cm_id *cm_id = cm_node->cm_id;
2144         struct nes_cm_node *loopback = cm_node->loopbackpartner;
2145
2146         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2147                 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2148
2149         if (cm_node->tcp_cntxt.client)
2150                 return ret;
2151         cleanup_retrans_entry(cm_node);
2152
2153         if (!loopback) {
2154                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2155                 if (passive_state == NES_SEND_RESET_EVENT) {
2156                         cm_node->state = NES_CM_STATE_CLOSED;
2157                         rem_ref_cm_node(cm_core, cm_node);
2158                 } else {
2159                         if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2160                                 rem_ref_cm_node(cm_core, cm_node);
2161                         } else {
2162                                 ret = send_mpa_reject(cm_node);
2163                                 if (ret) {
2164                                         cm_node->state = NES_CM_STATE_CLOSED;
2165                                         err = send_reset(cm_node, NULL);
2166                                         if (err)
2167                                                 WARN_ON(1);
2168                                 } else
2169                                         cm_id->add_ref(cm_id);
2170                         }
2171                 }
2172         } else {
2173                 cm_node->cm_id = NULL;
2174                 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2175                         rem_ref_cm_node(cm_core, cm_node);
2176                         rem_ref_cm_node(cm_core, loopback);
2177                 } else {
2178                         event.cm_node = loopback;
2179                         event.cm_info.rem_addr = loopback->rem_addr;
2180                         event.cm_info.loc_addr = loopback->loc_addr;
2181                         event.cm_info.rem_port = loopback->rem_port;
2182                         event.cm_info.loc_port = loopback->loc_port;
2183                         event.cm_info.cm_id = loopback->cm_id;
2184                         cm_event_mpa_reject(&event);
2185                         rem_ref_cm_node(cm_core, cm_node);
2186                         loopback->state = NES_CM_STATE_CLOSING;
2187
2188                         cm_id = loopback->cm_id;
2189                         rem_ref_cm_node(cm_core, loopback);
2190                         cm_id->rem_ref(cm_id);
2191                 }
2192         }
2193
2194         return ret;
2195 }
2196
2197
2198 /**
2199  * mini_cm_close
2200  */
2201 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2202 {
2203         int ret = 0;
2204
2205         if (!cm_core || !cm_node)
2206                 return -EINVAL;
2207
2208         switch (cm_node->state) {
2209         case NES_CM_STATE_SYN_RCVD:
2210         case NES_CM_STATE_SYN_SENT:
2211         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2212         case NES_CM_STATE_ESTABLISHED:
2213         case NES_CM_STATE_ACCEPTING:
2214         case NES_CM_STATE_MPAREQ_SENT:
2215         case NES_CM_STATE_MPAREQ_RCVD:
2216                 cleanup_retrans_entry(cm_node);
2217                 send_reset(cm_node, NULL);
2218                 break;
2219         case NES_CM_STATE_CLOSE_WAIT:
2220                 cm_node->state = NES_CM_STATE_LAST_ACK;
2221                 send_fin(cm_node, NULL);
2222                 break;
2223         case NES_CM_STATE_FIN_WAIT1:
2224         case NES_CM_STATE_FIN_WAIT2:
2225         case NES_CM_STATE_LAST_ACK:
2226         case NES_CM_STATE_TIME_WAIT:
2227         case NES_CM_STATE_CLOSING:
2228                 ret = -1;
2229                 break;
2230         case NES_CM_STATE_LISTENING:
2231                 cleanup_retrans_entry(cm_node);
2232                 send_reset(cm_node, NULL);
2233                 break;
2234         case NES_CM_STATE_MPAREJ_RCVD:
2235         case NES_CM_STATE_UNKNOWN:
2236         case NES_CM_STATE_INITED:
2237         case NES_CM_STATE_CLOSED:
2238         case NES_CM_STATE_LISTENER_DESTROYED:
2239                 ret = rem_ref_cm_node(cm_core, cm_node);
2240                 break;
2241         case NES_CM_STATE_TSA:
2242                 if (cm_node->send_entry)
2243                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2244                                 "send_entry=%p\n", cm_node->send_entry);
2245                 ret = rem_ref_cm_node(cm_core, cm_node);
2246                 break;
2247         }
2248         return ret;
2249 }
2250
2251
2252 /**
2253  * recv_pkt - recv an ETHERNET packet, and process it through CM
2254  * node state machine
2255  */
2256 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2257         struct nes_vnic *nesvnic, struct sk_buff *skb)
2258 {
2259         struct nes_cm_node *cm_node = NULL;
2260         struct nes_cm_listener *listener = NULL;
2261         struct iphdr *iph;
2262         struct tcphdr *tcph;
2263         struct nes_cm_info nfo;
2264         int skb_handled = 1;
2265         __be32 tmp_daddr, tmp_saddr;
2266
2267         if (!skb)
2268                 return 0;
2269         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2270                 return 0;
2271         }
2272
2273         iph = (struct iphdr *)skb->data;
2274         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2275
2276         nfo.loc_addr = ntohl(iph->daddr);
2277         nfo.loc_port = ntohs(tcph->dest);
2278         nfo.rem_addr = ntohl(iph->saddr);
2279         nfo.rem_port = ntohs(tcph->source);
2280
2281         tmp_daddr = cpu_to_be32(iph->daddr);
2282         tmp_saddr = cpu_to_be32(iph->saddr);
2283
2284         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2285                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2286
2287         do {
2288                 cm_node = find_node(cm_core,
2289                         nfo.rem_port, nfo.rem_addr,
2290                         nfo.loc_port, nfo.loc_addr);
2291
2292                 if (!cm_node) {
2293                         /* Only type of packet accepted are for */
2294                         /* the PASSIVE open (syn only) */
2295                         if ((!tcph->syn) || (tcph->ack)) {
2296                                 skb_handled = 0;
2297                                 break;
2298                         }
2299                         listener = find_listener(cm_core, nfo.loc_addr,
2300                                 nfo.loc_port,
2301                                 NES_CM_LISTENER_ACTIVE_STATE);
2302                         if (!listener) {
2303                                 nfo.cm_id = NULL;
2304                                 nfo.conn_type = 0;
2305                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2306                                 skb_handled = 0;
2307                                 break;
2308                         }
2309                         nfo.cm_id = listener->cm_id;
2310                         nfo.conn_type = listener->conn_type;
2311                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2312                                 listener);
2313                         if (!cm_node) {
2314                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2315                                         "node\n");
2316                                 cm_packets_dropped++;
2317                                 atomic_dec(&listener->ref_count);
2318                                 dev_kfree_skb_any(skb);
2319                                 break;
2320                         }
2321                         if (!tcph->rst && !tcph->fin) {
2322                                 cm_node->state = NES_CM_STATE_LISTENING;
2323                         } else {
2324                                 cm_packets_dropped++;
2325                                 rem_ref_cm_node(cm_core, cm_node);
2326                                 dev_kfree_skb_any(skb);
2327                                 break;
2328                         }
2329                         add_ref_cm_node(cm_node);
2330                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2331                         rem_ref_cm_node(cm_core, cm_node);
2332                         atomic_inc(&cm_accel_dropped_pkts);
2333                         dev_kfree_skb_any(skb);
2334                         break;
2335                 }
2336                 skb_reset_network_header(skb);
2337                 skb_set_transport_header(skb, sizeof(*tcph));
2338                 skb->len = ntohs(iph->tot_len);
2339                 process_packet(cm_node, skb, cm_core);
2340                 rem_ref_cm_node(cm_core, cm_node);
2341         } while (0);
2342         return skb_handled;
2343 }
2344
2345
2346 /**
2347  * nes_cm_alloc_core - allocate a top level instance of a cm core
2348  */
2349 static struct nes_cm_core *nes_cm_alloc_core(void)
2350 {
2351         struct nes_cm_core *cm_core;
2352
2353         /* setup the CM core */
2354         /* alloc top level core control structure */
2355         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2356         if (!cm_core)
2357                 return NULL;
2358
2359         INIT_LIST_HEAD(&cm_core->connected_nodes);
2360         init_timer(&cm_core->tcp_timer);
2361         cm_core->tcp_timer.function = nes_cm_timer_tick;
2362
2363         cm_core->mtu   = NES_CM_DEFAULT_MTU;
2364         cm_core->state = NES_CM_STATE_INITED;
2365         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2366
2367         atomic_set(&cm_core->events_posted, 0);
2368
2369         cm_core->api = &nes_cm_api;
2370
2371         spin_lock_init(&cm_core->ht_lock);
2372         spin_lock_init(&cm_core->listen_list_lock);
2373
2374         INIT_LIST_HEAD(&cm_core->listen_list.list);
2375
2376         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2377
2378         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2379         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2380         cm_core->post_event = nes_cm_post_event;
2381         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2382         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2383
2384         print_core(cm_core);
2385         return cm_core;
2386 }
2387
2388
2389 /**
2390  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2391  */
2392 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2393 {
2394         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2395
2396         if (!cm_core)
2397                 return -EINVAL;
2398
2399         barrier();
2400
2401         if (timer_pending(&cm_core->tcp_timer)) {
2402                 del_timer(&cm_core->tcp_timer);
2403         }
2404
2405         destroy_workqueue(cm_core->event_wq);
2406         destroy_workqueue(cm_core->disconn_wq);
2407         nes_debug(NES_DBG_CM, "\n");
2408         kfree(cm_core);
2409
2410         return 0;
2411 }
2412
2413
2414 /**
2415  * mini_cm_get
2416  */
2417 static int mini_cm_get(struct nes_cm_core *cm_core)
2418 {
2419         return cm_core->state;
2420 }
2421
2422
2423 /**
2424  * mini_cm_set
2425  */
2426 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2427 {
2428         int ret = 0;
2429
2430         switch (type) {
2431         case NES_CM_SET_PKT_SIZE:
2432                 cm_core->mtu = value;
2433                 break;
2434         case NES_CM_SET_FREE_PKT_Q_SIZE:
2435                 cm_core->free_tx_pkt_max = value;
2436                 break;
2437         default:
2438                 /* unknown set option */
2439                 ret = -EINVAL;
2440         }
2441
2442         return ret;
2443 }
2444
2445
2446 /**
2447  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2448  * successfully exchanged when this is called
2449  */
2450 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2451 {
2452         int ret = 0;
2453
2454         if (!nesqp)
2455                 return -EINVAL;
2456
2457         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2458                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2459                         NES_QPCONTEXT_MISC_DROS);
2460
2461         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2462                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2463
2464         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2465
2466         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2467
2468         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2469                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2470
2471         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2472                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2473                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2474
2475         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2476                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2477                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2478
2479         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2480         nesqp->nesqp_context->ts_recent = 0;
2481         nesqp->nesqp_context->ts_age = 0;
2482         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2483         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2484         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2485         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2486                         cm_node->tcp_cntxt.rcv_wscale);
2487         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2488         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2489         nesqp->nesqp_context->srtt = 0;
2490         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2491         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2492         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2493         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2494         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2495         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2496
2497         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2498                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2499                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2500                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2501                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2502                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2503                         le32_to_cpu(nesqp->nesqp_context->misc));
2504         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2505         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2506         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2507
2508         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2509         cm_node->state = NES_CM_STATE_TSA;
2510
2511         return ret;
2512 }
2513
2514
2515 /**
2516  * nes_cm_disconn
2517  */
2518 int nes_cm_disconn(struct nes_qp *nesqp)
2519 {
2520         struct disconn_work *work;
2521
2522         work = kzalloc(sizeof *work, GFP_ATOMIC);
2523         if (!work)
2524                 return -ENOMEM; /* Timer will clean up */
2525
2526         nes_add_ref(&nesqp->ibqp);
2527         work->nesqp = nesqp;
2528         INIT_WORK(&work->work, nes_disconnect_worker);
2529         queue_work(g_cm_core->disconn_wq, &work->work);
2530         return 0;
2531 }
2532
2533
2534 /**
2535  * nes_disconnect_worker
2536  */
2537 static void nes_disconnect_worker(struct work_struct *work)
2538 {
2539         struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2540         struct nes_qp *nesqp = dwork->nesqp;
2541
2542         kfree(dwork);
2543         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2544                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2545         nes_cm_disconn_true(nesqp);
2546         nes_rem_ref(&nesqp->ibqp);
2547 }
2548
2549
2550 /**
2551  * nes_cm_disconn_true
2552  */
2553 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2554 {
2555         unsigned long flags;
2556         int ret = 0;
2557         struct iw_cm_id *cm_id;
2558         struct iw_cm_event cm_event;
2559         struct nes_vnic *nesvnic;
2560         u16 last_ae;
2561         u8 original_hw_tcp_state;
2562         u8 original_ibqp_state;
2563         enum iw_cm_event_status disconn_status = IW_CM_EVENT_STATUS_OK;
2564         int issue_disconn = 0;
2565         int issue_close = 0;
2566         int issue_flush = 0;
2567         u32 flush_q = NES_CQP_FLUSH_RQ;
2568         struct ib_event ibevent;
2569
2570         if (!nesqp) {
2571                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2572                 return -1;
2573         }
2574
2575         spin_lock_irqsave(&nesqp->lock, flags);
2576         cm_id = nesqp->cm_id;
2577         /* make sure we havent already closed this connection */
2578         if (!cm_id) {
2579                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2580                                 nesqp->hwqp.qp_id);
2581                 spin_unlock_irqrestore(&nesqp->lock, flags);
2582                 return -1;
2583         }
2584
2585         nesvnic = to_nesvnic(nesqp->ibqp.device);
2586         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2587
2588         original_hw_tcp_state = nesqp->hw_tcp_state;
2589         original_ibqp_state   = nesqp->ibqp_state;
2590         last_ae = nesqp->last_aeq;
2591
2592         if (nesqp->term_flags) {
2593                 issue_disconn = 1;
2594                 issue_close = 1;
2595                 nesqp->cm_id = NULL;
2596                 if (nesqp->flush_issued == 0) {
2597                         nesqp->flush_issued = 1;
2598                         issue_flush = 1;
2599                 }
2600         } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2601                         ((original_ibqp_state == IB_QPS_RTS) &&
2602                         (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2603                 issue_disconn = 1;
2604                 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2605                         disconn_status = IW_CM_EVENT_STATUS_RESET;
2606         }
2607
2608         if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2609                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2610                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2611                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2612                 issue_close = 1;
2613                 nesqp->cm_id = NULL;
2614                 if (nesqp->flush_issued == 0) {
2615                         nesqp->flush_issued = 1;
2616                         issue_flush = 1;
2617                 }
2618         }
2619
2620         spin_unlock_irqrestore(&nesqp->lock, flags);
2621
2622         if ((issue_flush) && (nesqp->destroyed == 0)) {
2623                 /* Flush the queue(s) */
2624                 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2625                         flush_q |= NES_CQP_FLUSH_SQ;
2626                 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2627
2628                 if (nesqp->term_flags) {
2629                         ibevent.device = nesqp->ibqp.device;
2630                         ibevent.event = nesqp->terminate_eventtype;
2631                         ibevent.element.qp = &nesqp->ibqp;
2632                         nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2633                 }
2634         }
2635
2636         if ((cm_id) && (cm_id->event_handler)) {
2637                 if (issue_disconn) {
2638                         atomic_inc(&cm_disconnects);
2639                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2640                         cm_event.status = disconn_status;
2641                         cm_event.local_addr = cm_id->local_addr;
2642                         cm_event.remote_addr = cm_id->remote_addr;
2643                         cm_event.private_data = NULL;
2644                         cm_event.private_data_len = 0;
2645
2646                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2647                                 " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2648                                 "cm_id = %p, refcount = %u.\n",
2649                                 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2650                                 nesqp->hwqp.sq_tail, cm_id,
2651                                 atomic_read(&nesqp->refcount));
2652
2653                         ret = cm_id->event_handler(cm_id, &cm_event);
2654                         if (ret)
2655                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2656                                         "returned, ret=%d\n", ret);
2657                 }
2658
2659                 if (issue_close) {
2660                         atomic_inc(&cm_closes);
2661                         nes_disconnect(nesqp, 1);
2662
2663                         cm_id->provider_data = nesqp;
2664                         /* Send up the close complete event */
2665                         cm_event.event = IW_CM_EVENT_CLOSE;
2666                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2667                         cm_event.provider_data = cm_id->provider_data;
2668                         cm_event.local_addr = cm_id->local_addr;
2669                         cm_event.remote_addr = cm_id->remote_addr;
2670                         cm_event.private_data = NULL;
2671                         cm_event.private_data_len = 0;
2672
2673                         ret = cm_id->event_handler(cm_id, &cm_event);
2674                         if (ret) {
2675                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2676                         }
2677
2678                         cm_id->rem_ref(cm_id);
2679                 }
2680         }
2681
2682         return 0;
2683 }
2684
2685
2686 /**
2687  * nes_disconnect
2688  */
2689 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2690 {
2691         int ret = 0;
2692         struct nes_vnic *nesvnic;
2693         struct nes_device *nesdev;
2694         struct nes_ib_device *nesibdev;
2695
2696         nesvnic = to_nesvnic(nesqp->ibqp.device);
2697         if (!nesvnic)
2698                 return -EINVAL;
2699
2700         nesdev = nesvnic->nesdev;
2701         nesibdev = nesvnic->nesibdev;
2702
2703         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2704                         netdev_refcnt_read(nesvnic->netdev));
2705
2706         if (nesqp->active_conn) {
2707
2708                 /* indicate this connection is NOT active */
2709                 nesqp->active_conn = 0;
2710         } else {
2711                 /* Need to free the Last Streaming Mode Message */
2712                 if (nesqp->ietf_frame) {
2713                         if (nesqp->lsmm_mr)
2714                                 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2715                         pci_free_consistent(nesdev->pcidev,
2716                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2717                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2718                 }
2719         }
2720
2721         /* close the CM node down if it is still active */
2722         if (nesqp->cm_node) {
2723                 nes_debug(NES_DBG_CM, "Call close API\n");
2724
2725                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2726         }
2727
2728         return ret;
2729 }
2730
2731
2732 /**
2733  * nes_accept
2734  */
2735 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2736 {
2737         u64 u64temp;
2738         struct ib_qp *ibqp;
2739         struct nes_qp *nesqp;
2740         struct nes_vnic *nesvnic;
2741         struct nes_device *nesdev;
2742         struct nes_cm_node *cm_node;
2743         struct nes_adapter *adapter;
2744         struct ib_qp_attr attr;
2745         struct iw_cm_event cm_event;
2746         struct nes_hw_qp_wqe *wqe;
2747         struct nes_v4_quad nes_quad;
2748         u32 crc_value;
2749         int ret;
2750         int passive_state;
2751         struct nes_ib_device *nesibdev;
2752         struct ib_mr *ibmr = NULL;
2753         struct ib_phys_buf ibphysbuf;
2754         struct nes_pd *nespd;
2755         u64 tagged_offset;
2756
2757         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2758         if (!ibqp)
2759                 return -EINVAL;
2760
2761         /* get all our handles */
2762         nesqp = to_nesqp(ibqp);
2763         nesvnic = to_nesvnic(nesqp->ibqp.device);
2764         nesdev = nesvnic->nesdev;
2765         adapter = nesdev->nesadapter;
2766
2767         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2768         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2769                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2770                 nesvnic->netdev->name);
2771
2772         if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
2773                 if (cm_node->loopbackpartner)
2774                         rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
2775                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2776                 return -EINVAL;
2777         }
2778
2779         passive_state = atomic_add_return(1, &cm_node->passive_state);
2780         if (passive_state == NES_SEND_RESET_EVENT) {
2781                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2782                 return -ECONNRESET;
2783         }
2784
2785         /* associate the node with the QP */
2786         nesqp->cm_node = (void *)cm_node;
2787         cm_node->nesqp = nesqp;
2788
2789         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
2790                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2791         atomic_inc(&cm_accepts);
2792
2793         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2794                         netdev_refcnt_read(nesvnic->netdev));
2795
2796         /* allocate the ietf frame and space for private data */
2797         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2798                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2799                 &nesqp->ietf_frame_pbase);
2800
2801         if (!nesqp->ietf_frame) {
2802                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
2803                         "data\n");
2804                 return -ENOMEM;
2805         }
2806
2807
2808         /* setup the MPA frame */
2809         nesqp->private_data_len = conn_param->private_data_len;
2810         memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2811
2812         memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2813                         conn_param->private_data_len);
2814
2815         nesqp->ietf_frame->priv_data_len =
2816                 cpu_to_be16(conn_param->private_data_len);
2817         nesqp->ietf_frame->rev = mpa_version;
2818         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2819
2820         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2821         wqe = &nesqp->hwqp.sq_vbase[0];
2822
2823         if (cm_id->remote_addr.sin_addr.s_addr !=
2824                         cm_id->local_addr.sin_addr.s_addr) {
2825                 u64temp = (unsigned long)nesqp;
2826                 nesibdev = nesvnic->nesibdev;
2827                 nespd = nesqp->nespd;
2828                 ibphysbuf.addr = nesqp->ietf_frame_pbase;
2829                 ibphysbuf.size = conn_param->private_data_len +
2830                                         sizeof(struct ietf_mpa_frame);
2831                 tagged_offset = (u64)(unsigned long)nesqp->ietf_frame;
2832                 ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
2833                                                 &ibphysbuf, 1,
2834                                                 IB_ACCESS_LOCAL_WRITE,
2835                                                 &tagged_offset);
2836                 if (!ibmr) {
2837                         nes_debug(NES_DBG_CM, "Unable to register memory region"
2838                                         "for lSMM for cm_node = %p \n",
2839                                         cm_node);
2840                         pci_free_consistent(nesdev->pcidev,
2841                                 nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2842                                 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2843                         return -ENOMEM;
2844                 }
2845
2846                 ibmr->pd = &nespd->ibpd;
2847                 ibmr->device = nespd->ibpd.device;
2848                 nesqp->lsmm_mr = ibmr;
2849
2850                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2851                 set_wqe_64bit_value(wqe->wqe_words,
2852                         NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2853                         u64temp);
2854                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2855                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2856                         NES_IWARP_SQ_WQE_WRPDU);
2857                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2858                         cpu_to_le32(conn_param->private_data_len +
2859                         sizeof(struct ietf_mpa_frame));
2860                 set_wqe_64bit_value(wqe->wqe_words,
2861                                         NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
2862                                         (u64)(unsigned long)nesqp->ietf_frame);
2863                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2864                         cpu_to_le32(conn_param->private_data_len +
2865                         sizeof(struct ietf_mpa_frame));
2866                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
2867                 if (nesqp->sq_kmapped) {
2868                         nesqp->sq_kmapped = 0;
2869                         kunmap(nesqp->page);
2870                 }
2871
2872                 nesqp->nesqp_context->ird_ord_sizes |=
2873                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2874                         NES_QPCONTEXT_ORDIRD_WRPDU);
2875         } else {
2876                 nesqp->nesqp_context->ird_ord_sizes |=
2877                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
2878         }
2879         nesqp->skip_lsmm = 1;
2880
2881
2882         /* Cache the cm_id in the qp */
2883         nesqp->cm_id = cm_id;
2884         cm_node->cm_id = cm_id;
2885
2886         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2887         cm_id->provider_data = nesqp;
2888         nesqp->active_conn   = 0;
2889
2890         if (cm_node->state == NES_CM_STATE_TSA)
2891                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2892                         cm_node);
2893
2894         nes_cm_init_tsa_conn(nesqp, cm_node);
2895
2896         nesqp->nesqp_context->tcpPorts[0] =
2897                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2898         nesqp->nesqp_context->tcpPorts[1] =
2899                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2900
2901         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2902                 nesqp->nesqp_context->ip0 =
2903                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2904         else
2905                 nesqp->nesqp_context->ip0 =
2906                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2907
2908         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2909                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2910                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2911
2912         nesqp->nesqp_context->arp_index_vlan |=
2913                 cpu_to_le32(nes_arp_table(nesdev,
2914                         le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2915                         NES_ARP_RESOLVE) << 16);
2916
2917         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2918                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2919
2920         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2921
2922         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2923                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2924         nesqp->nesqp_context->ird_ord_sizes |=
2925                 cpu_to_le32((u32)conn_param->ord);
2926
2927         memset(&nes_quad, 0, sizeof(nes_quad));
2928         nes_quad.DstIpAdrIndex =
2929                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2930         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2931                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2932         else
2933                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2934         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2935         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2936
2937         /* Produce hash key */
2938         crc_value = get_crc_value(&nes_quad);
2939         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2940         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2941                 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2942
2943         nesqp->hte_index &= adapter->hte_index_mask;
2944         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2945
2946         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2947
2948         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2949                         "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2950                         "private data length=%zu.\n", nesqp->hwqp.qp_id,
2951                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2952                         ntohs(cm_id->remote_addr.sin_port),
2953                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2954                         ntohs(cm_id->local_addr.sin_port),
2955                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2956                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2957                         conn_param->private_data_len +
2958                         sizeof(struct ietf_mpa_frame));
2959
2960
2961         /* notify OF layer that accept event was successful */
2962         cm_id->add_ref(cm_id);
2963         nes_add_ref(&nesqp->ibqp);
2964
2965         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2966         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2967         cm_event.provider_data = (void *)nesqp;
2968         cm_event.local_addr = cm_id->local_addr;
2969         cm_event.remote_addr = cm_id->remote_addr;
2970         cm_event.private_data = NULL;
2971         cm_event.private_data_len = 0;
2972         ret = cm_id->event_handler(cm_id, &cm_event);
2973         attr.qp_state = IB_QPS_RTS;
2974         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2975         if (cm_node->loopbackpartner) {
2976                 cm_node->loopbackpartner->mpa_frame_size =
2977                         nesqp->private_data_len;
2978                 /* copy entire MPA frame to our cm_node's frame */
2979                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2980                         nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2981                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2982         }
2983         if (ret)
2984                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2985                         "ret=%d\n", __func__, __LINE__, ret);
2986
2987         return 0;
2988 }
2989
2990
2991 /**
2992  * nes_reject
2993  */
2994 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2995 {
2996         struct nes_cm_node *cm_node;
2997         struct nes_cm_node *loopback;
2998
2999         struct nes_cm_core *cm_core;
3000
3001         atomic_inc(&cm_rejects);
3002         cm_node = (struct nes_cm_node *) cm_id->provider_data;
3003         loopback = cm_node->loopbackpartner;
3004         cm_core = cm_node->cm_core;
3005         cm_node->cm_id = cm_id;
3006         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
3007
3008         if (cm_node->mpa_frame_size > MAX_CM_BUFFER)
3009                 return -EINVAL;
3010
3011         memcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
3012         if (loopback) {
3013                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3014                 loopback->mpa_frame.priv_data_len = pdata_len;
3015                 loopback->mpa_frame_size = sizeof(struct ietf_mpa_frame) +
3016                                 pdata_len;
3017         } else {
3018                 memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
3019                 cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
3020         }
3021
3022         cm_node->mpa_frame.rev = mpa_version;
3023         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
3024
3025         return cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
3026 }
3027
3028
3029 /**
3030  * nes_connect
3031  * setup and launch cm connect node
3032  */
3033 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3034 {
3035         struct ib_qp *ibqp;
3036         struct nes_qp *nesqp;
3037         struct nes_vnic *nesvnic;
3038         struct nes_device *nesdev;
3039         struct nes_cm_node *cm_node;
3040         struct nes_cm_info cm_info;
3041         int apbvt_set = 0;
3042
3043         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3044         if (!ibqp)
3045                 return -EINVAL;
3046         nesqp = to_nesqp(ibqp);
3047         if (!nesqp)
3048                 return -EINVAL;
3049         nesvnic = to_nesvnic(nesqp->ibqp.device);
3050         if (!nesvnic)
3051                 return -EINVAL;
3052         nesdev  = nesvnic->nesdev;
3053         if (!nesdev)
3054                 return -EINVAL;
3055
3056         if (!(cm_id->local_addr.sin_port) || !(cm_id->remote_addr.sin_port))
3057                 return -EINVAL;
3058
3059         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3060                 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3061                 ntohl(nesvnic->local_ipaddr),
3062                 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3063                 ntohs(cm_id->remote_addr.sin_port),
3064                 ntohl(cm_id->local_addr.sin_addr.s_addr),
3065                 ntohs(cm_id->local_addr.sin_port));
3066
3067         atomic_inc(&cm_connects);
3068         nesqp->active_conn = 1;
3069
3070         /* cache the cm_id in the qp */
3071         nesqp->cm_id = cm_id;
3072
3073         cm_id->provider_data = nesqp;
3074
3075         nesqp->private_data_len = conn_param->private_data_len;
3076         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
3077         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3078         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3079                 conn_param->private_data_len);
3080
3081         if (cm_id->local_addr.sin_addr.s_addr !=
3082                 cm_id->remote_addr.sin_addr.s_addr) {
3083                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3084                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3085                 apbvt_set = 1;
3086         }
3087
3088         /* set up the connection params for the node */
3089         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3090         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3091         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3092         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3093         cm_info.cm_id = cm_id;
3094         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3095
3096         cm_id->add_ref(cm_id);
3097
3098         /* create a connect CM node connection */
3099         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3100                 conn_param->private_data_len, (void *)conn_param->private_data,
3101                 &cm_info);
3102         if (!cm_node) {
3103                 if (apbvt_set)
3104                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3105                                 PCI_FUNC(nesdev->pcidev->devfn),
3106                                 NES_MANAGE_APBVT_DEL);
3107
3108                 cm_id->rem_ref(cm_id);
3109                 return -ENOMEM;
3110         }
3111
3112         cm_node->apbvt_set = apbvt_set;
3113         nesqp->cm_node = cm_node;
3114         cm_node->nesqp = nesqp;
3115         nes_add_ref(&nesqp->ibqp);
3116
3117         return 0;
3118 }
3119
3120
3121 /**
3122  * nes_create_listen
3123  */
3124 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3125 {
3126         struct nes_vnic *nesvnic;
3127         struct nes_cm_listener *cm_node;
3128         struct nes_cm_info cm_info;
3129         int err;
3130
3131         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3132                         cm_id, ntohs(cm_id->local_addr.sin_port));
3133
3134         nesvnic = to_nesvnic(cm_id->device);
3135         if (!nesvnic)
3136                 return -EINVAL;
3137
3138         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3139                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3140
3141         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3142                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3143
3144         /* setup listen params in our api call struct */
3145         cm_info.loc_addr = nesvnic->local_ipaddr;
3146         cm_info.loc_port = cm_id->local_addr.sin_port;
3147         cm_info.backlog = backlog;
3148         cm_info.cm_id = cm_id;
3149
3150         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3151
3152
3153         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3154         if (!cm_node) {
3155                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3156                                 __func__, __LINE__);
3157                 return -ENOMEM;
3158         }
3159
3160         cm_id->provider_data = cm_node;
3161
3162         if (!cm_node->reused_node) {
3163                 err = nes_manage_apbvt(nesvnic,
3164                         ntohs(cm_id->local_addr.sin_port),
3165                         PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3166                         NES_MANAGE_APBVT_ADD);
3167                 if (err) {
3168                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3169                                 err);
3170                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3171                         return err;
3172                 }
3173                 atomic_inc(&cm_listens_created);
3174         }
3175
3176         cm_id->add_ref(cm_id);
3177         cm_id->provider_data = (void *)cm_node;
3178
3179
3180         return 0;
3181 }
3182
3183
3184 /**
3185  * nes_destroy_listen
3186  */
3187 int nes_destroy_listen(struct iw_cm_id *cm_id)
3188 {
3189         if (cm_id->provider_data)
3190                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3191         else
3192                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3193
3194         cm_id->rem_ref(cm_id);
3195
3196         return 0;
3197 }
3198
3199
3200 /**
3201  * nes_cm_recv
3202  */
3203 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3204 {
3205         int rc = 0;
3206         cm_packets_received++;
3207         if ((g_cm_core) && (g_cm_core->api)) {
3208                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3209         } else {
3210                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3211                                 " cm is not setup properly.\n");
3212         }
3213
3214         return rc;
3215 }
3216
3217
3218 /**
3219  * nes_cm_start
3220  * Start and init a cm core module
3221  */
3222 int nes_cm_start(void)
3223 {
3224         nes_debug(NES_DBG_CM, "\n");
3225         /* create the primary CM core, pass this handle to subsequent core inits */
3226         g_cm_core = nes_cm_alloc_core();
3227         if (g_cm_core) {
3228                 return 0;
3229         } else {
3230                 return -ENOMEM;
3231         }
3232 }
3233
3234
3235 /**
3236  * nes_cm_stop
3237  * stop and dealloc all cm core instances
3238  */
3239 int nes_cm_stop(void)
3240 {
3241         g_cm_core->api->destroy_cm_core(g_cm_core);
3242         return 0;
3243 }
3244
3245
3246 /**
3247  * cm_event_connected
3248  * handle a connected event, setup QPs and HW
3249  */
3250 static void cm_event_connected(struct nes_cm_event *event)
3251 {
3252         u64 u64temp;
3253         struct nes_qp *nesqp;
3254         struct nes_vnic *nesvnic;
3255         struct nes_device *nesdev;
3256         struct nes_cm_node *cm_node;
3257         struct nes_adapter *nesadapter;
3258         struct ib_qp_attr attr;
3259         struct iw_cm_id *cm_id;
3260         struct iw_cm_event cm_event;
3261         struct nes_hw_qp_wqe *wqe;
3262         struct nes_v4_quad nes_quad;
3263         u32 crc_value;
3264         int ret;
3265
3266         /* get all our handles */
3267         cm_node = event->cm_node;
3268         cm_id = cm_node->cm_id;
3269         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3270         nesqp = (struct nes_qp *)cm_id->provider_data;
3271         nesvnic = to_nesvnic(nesqp->ibqp.device);
3272         nesdev = nesvnic->nesdev;
3273         nesadapter = nesdev->nesadapter;
3274
3275         if (nesqp->destroyed) {
3276                 return;
3277         }
3278         atomic_inc(&cm_connecteds);
3279         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3280                         " local port 0x%04X. jiffies = %lu.\n",
3281                         nesqp->hwqp.qp_id,
3282                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
3283                         ntohs(cm_id->remote_addr.sin_port),
3284                         ntohs(cm_id->local_addr.sin_port),
3285                         jiffies);
3286
3287         nes_cm_init_tsa_conn(nesqp, cm_node);
3288
3289         /* set the QP tsa context */
3290         nesqp->nesqp_context->tcpPorts[0] =
3291                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3292         nesqp->nesqp_context->tcpPorts[1] =
3293                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3294         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3295                 nesqp->nesqp_context->ip0 =
3296                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3297         else
3298                 nesqp->nesqp_context->ip0 =
3299                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3300
3301         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3302                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3303                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3304         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3305                         nes_arp_table(nesdev,
3306                         le32_to_cpu(nesqp->nesqp_context->ip0),
3307                         NULL, NES_ARP_RESOLVE) << 16);
3308         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3309                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3310         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3311         nesqp->nesqp_context->ird_ord_sizes |=
3312                         cpu_to_le32((u32)1 <<
3313                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3314
3315         /* Adjust tail for not having a LSMM */
3316         nesqp->hwqp.sq_tail = 1;
3317
3318 #if defined(NES_SEND_FIRST_WRITE)
3319         if (cm_node->send_write0) {
3320                 nes_debug(NES_DBG_CM, "Sending first write.\n");
3321                 wqe = &nesqp->hwqp.sq_vbase[0];
3322                 u64temp = (unsigned long)nesqp;
3323                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3324                 set_wqe_64bit_value(wqe->wqe_words,
3325                                 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3326                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3327                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3328                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3329                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3330                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3331                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3332                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3333
3334                 if (nesqp->sq_kmapped) {
3335                         nesqp->sq_kmapped = 0;
3336                         kunmap(nesqp->page);
3337                 }
3338
3339                 /* use the reserved spot on the WQ for the extra first WQE */
3340                 nesqp->nesqp_context->ird_ord_sizes &=
3341                         cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3342                                                 NES_QPCONTEXT_ORDIRD_WRPDU |
3343                                                 NES_QPCONTEXT_ORDIRD_ALSMM));
3344                 nesqp->skip_lsmm = 1;
3345                 nesqp->hwqp.sq_tail = 0;
3346                 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3347                                 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3348         }
3349 #endif
3350
3351         memset(&nes_quad, 0, sizeof(nes_quad));
3352
3353         nes_quad.DstIpAdrIndex =
3354                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3355         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3356                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3357         else
3358                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3359         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3360         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3361
3362         /* Produce hash key */
3363         crc_value = get_crc_value(&nes_quad);
3364         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3365         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3366                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3367
3368         nesqp->hte_index &= nesadapter->hte_index_mask;
3369         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3370
3371         nesqp->ietf_frame = &cm_node->mpa_frame;
3372         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3373         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3374
3375         /* notify OF layer we successfully created the requested connection */
3376         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3377         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
3378         cm_event.provider_data = cm_id->provider_data;
3379         cm_event.local_addr.sin_family = AF_INET;
3380         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3381         cm_event.remote_addr = cm_id->remote_addr;
3382
3383         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3384         cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3385
3386         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3387         ret = cm_id->event_handler(cm_id, &cm_event);
3388         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3389
3390         if (ret)
3391                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3392                         "ret=%d\n", __func__, __LINE__, ret);
3393         attr.qp_state = IB_QPS_RTS;
3394         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3395
3396         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3397                 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3398
3399         return;
3400 }
3401
3402
3403 /**
3404  * cm_event_connect_error
3405  */
3406 static void cm_event_connect_error(struct nes_cm_event *event)
3407 {
3408         struct nes_qp *nesqp;
3409         struct iw_cm_id *cm_id;
3410         struct iw_cm_event cm_event;
3411         /* struct nes_cm_info cm_info; */
3412         int ret;
3413
3414         if (!event->cm_node)
3415                 return;
3416
3417         cm_id = event->cm_node->cm_id;
3418         if (!cm_id) {
3419                 return;
3420         }
3421
3422         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3423         nesqp = cm_id->provider_data;
3424
3425         if (!nesqp) {
3426                 return;
3427         }
3428
3429         /* notify OF layer about this connection error event */
3430         /* cm_id->rem_ref(cm_id); */
3431         nesqp->cm_id = NULL;
3432         cm_id->provider_data = NULL;
3433         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3434         cm_event.status = -ECONNRESET;
3435         cm_event.provider_data = cm_id->provider_data;
3436         cm_event.local_addr = cm_id->local_addr;
3437         cm_event.remote_addr = cm_id->remote_addr;
3438         cm_event.private_data = NULL;
3439         cm_event.private_data_len = 0;
3440
3441         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3442                 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3443                 cm_event.remote_addr.sin_addr.s_addr);
3444
3445         ret = cm_id->event_handler(cm_id, &cm_event);
3446         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3447         if (ret)
3448                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3449                         "ret=%d\n", __func__, __LINE__, ret);
3450         cm_id->rem_ref(cm_id);
3451
3452         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3453         return;
3454 }
3455
3456
3457 /**
3458  * cm_event_reset
3459  */
3460 static void cm_event_reset(struct nes_cm_event *event)
3461 {
3462         struct nes_qp *nesqp;
3463         struct iw_cm_id *cm_id;
3464         struct iw_cm_event cm_event;
3465         /* struct nes_cm_info cm_info; */
3466         int ret;
3467
3468         if (!event->cm_node)
3469                 return;
3470
3471         if (!event->cm_node->cm_id)
3472                 return;
3473
3474         cm_id = event->cm_node->cm_id;
3475
3476         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3477         nesqp = cm_id->provider_data;
3478         if (!nesqp)
3479                 return;
3480
3481         nesqp->cm_id = NULL;
3482         /* cm_id->provider_data = NULL; */
3483         cm_event.event = IW_CM_EVENT_DISCONNECT;
3484         cm_event.status = IW_CM_EVENT_STATUS_RESET;
3485         cm_event.provider_data = cm_id->provider_data;
3486         cm_event.local_addr = cm_id->local_addr;
3487         cm_event.remote_addr = cm_id->remote_addr;
3488         cm_event.private_data = NULL;
3489         cm_event.private_data_len = 0;
3490
3491         cm_id->add_ref(cm_id);
3492         ret = cm_id->event_handler(cm_id, &cm_event);
3493         atomic_inc(&cm_closes);
3494         cm_event.event = IW_CM_EVENT_CLOSE;
3495         cm_event.status = IW_CM_EVENT_STATUS_OK;
3496         cm_event.provider_data = cm_id->provider_data;
3497         cm_event.local_addr = cm_id->local_addr;
3498         cm_event.remote_addr = cm_id->remote_addr;
3499         cm_event.private_data = NULL;
3500         cm_event.private_data_len = 0;
3501         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3502         ret = cm_id->event_handler(cm_id, &cm_event);
3503
3504         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3505
3506
3507         /* notify OF layer about this connection error event */
3508         cm_id->rem_ref(cm_id);
3509
3510         return;
3511 }
3512
3513
3514 /**
3515  * cm_event_mpa_req
3516  */
3517 static void cm_event_mpa_req(struct nes_cm_event *event)
3518 {
3519         struct iw_cm_id   *cm_id;
3520         struct iw_cm_event cm_event;
3521         int ret;
3522         struct nes_cm_node *cm_node;
3523
3524         cm_node = event->cm_node;
3525         if (!cm_node)
3526                 return;
3527         cm_id = cm_node->cm_id;
3528
3529         atomic_inc(&cm_connect_reqs);
3530         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3531                         cm_node, cm_id, jiffies);
3532
3533         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3534         cm_event.status = IW_CM_EVENT_STATUS_OK;
3535         cm_event.provider_data = (void *)cm_node;
3536
3537         cm_event.local_addr.sin_family = AF_INET;
3538         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3539         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3540
3541         cm_event.remote_addr.sin_family = AF_INET;
3542         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3543         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3544         cm_event.private_data = cm_node->mpa_frame_buf;
3545         cm_event.private_data_len  = (u8) cm_node->mpa_frame_size;
3546
3547         ret = cm_id->event_handler(cm_id, &cm_event);
3548         if (ret)
3549                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3550                                 __func__, __LINE__, ret);
3551         return;
3552 }
3553
3554
3555 static void cm_event_mpa_reject(struct nes_cm_event *event)
3556 {
3557         struct iw_cm_id   *cm_id;
3558         struct iw_cm_event cm_event;
3559         struct nes_cm_node *cm_node;
3560         int ret;
3561
3562         cm_node = event->cm_node;
3563         if (!cm_node)
3564                 return;
3565         cm_id = cm_node->cm_id;
3566
3567         atomic_inc(&cm_connect_reqs);
3568         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3569                         cm_node, cm_id, jiffies);
3570
3571         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3572         cm_event.status = -ECONNREFUSED;
3573         cm_event.provider_data = cm_id->provider_data;
3574
3575         cm_event.local_addr.sin_family = AF_INET;
3576         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3577         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3578
3579         cm_event.remote_addr.sin_family = AF_INET;
3580         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3581         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3582
3583         cm_event.private_data = cm_node->mpa_frame_buf;
3584         cm_event.private_data_len = (u8) cm_node->mpa_frame_size;
3585
3586         nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3587                         "remove_addr=%08x\n",
3588                         cm_event.local_addr.sin_addr.s_addr,
3589                         cm_event.remote_addr.sin_addr.s_addr);
3590
3591         ret = cm_id->event_handler(cm_id, &cm_event);
3592         if (ret)
3593                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3594                                 __func__, __LINE__, ret);
3595
3596         return;
3597 }
3598
3599
3600 static void nes_cm_event_handler(struct work_struct *);
3601
3602 /**
3603  * nes_cm_post_event
3604  * post an event to the cm event handler
3605  */
3606 static int nes_cm_post_event(struct nes_cm_event *event)
3607 {
3608         atomic_inc(&event->cm_node->cm_core->events_posted);
3609         add_ref_cm_node(event->cm_node);
3610         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3611         INIT_WORK(&event->event_work, nes_cm_event_handler);
3612         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3613                 event->cm_node, event);
3614
3615         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3616
3617         nes_debug(NES_DBG_CM, "Exit\n");
3618         return 0;
3619 }
3620
3621
3622 /**
3623  * nes_cm_event_handler
3624  * worker function to handle cm events
3625  * will free instance of nes_cm_event
3626  */
3627 static void nes_cm_event_handler(struct work_struct *work)
3628 {
3629         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3630                         event_work);
3631         struct nes_cm_core *cm_core;
3632
3633         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3634                 return;
3635
3636         cm_core = event->cm_node->cm_core;
3637         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3638                 event, event->type, atomic_read(&cm_core->events_posted));
3639
3640         switch (event->type) {
3641         case NES_CM_EVENT_MPA_REQ:
3642                 cm_event_mpa_req(event);
3643                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3644                         event->cm_node);
3645                 break;
3646         case NES_CM_EVENT_RESET:
3647                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3648                         event->cm_node);
3649                 cm_event_reset(event);
3650                 break;
3651         case NES_CM_EVENT_CONNECTED:
3652                 if ((!event->cm_node->cm_id) ||
3653                         (event->cm_node->state != NES_CM_STATE_TSA))
3654                         break;
3655                 cm_event_connected(event);
3656                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3657                 break;
3658         case NES_CM_EVENT_MPA_REJECT:
3659                 if ((!event->cm_node->cm_id) ||
3660                                 (event->cm_node->state == NES_CM_STATE_TSA))
3661                         break;
3662                 cm_event_mpa_reject(event);
3663                 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3664                 break;
3665
3666         case NES_CM_EVENT_ABORTED:
3667                 if ((!event->cm_node->cm_id) ||
3668                         (event->cm_node->state == NES_CM_STATE_TSA))
3669                         break;
3670                 cm_event_connect_error(event);
3671                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3672                 break;
3673         case NES_CM_EVENT_DROPPED_PKT:
3674                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3675                 break;
3676         default:
3677                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3678                 break;
3679         }
3680
3681         atomic_dec(&cm_core->events_posted);
3682         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3683         rem_ref_cm_node(cm_core, event->cm_node);
3684         kfree(event);
3685
3686         return;
3687 }