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         atomic_inc(&cm_resets_recvd);
1428         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1429                         " refcnt=%d\n", cm_node, cm_node->state,
1430                         atomic_read(&cm_node->ref_count));
1431         cleanup_retrans_entry(cm_node);
1432         switch (cm_node->state) {
1433         case NES_CM_STATE_SYN_SENT:
1434         case NES_CM_STATE_MPAREQ_SENT:
1435                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1436                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1437                         cm_node->listener, cm_node->state);
1438                 active_open_err(cm_node, skb, reset);
1439                 break;
1440         case NES_CM_STATE_MPAREQ_RCVD:
1441                 atomic_inc(&cm_node->passive_state);
1442                 dev_kfree_skb_any(skb);
1443                 break;
1444         case NES_CM_STATE_ESTABLISHED:
1445         case NES_CM_STATE_SYN_RCVD:
1446         case NES_CM_STATE_LISTENING:
1447                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1448                 passive_open_err(cm_node, skb, reset);
1449                 break;
1450         case NES_CM_STATE_TSA:
1451                 active_open_err(cm_node, skb, reset);
1452                 break;
1453         case NES_CM_STATE_CLOSED:
1454                 drop_packet(skb);
1455                 break;
1456         case NES_CM_STATE_FIN_WAIT2:
1457         case NES_CM_STATE_FIN_WAIT1:
1458         case NES_CM_STATE_LAST_ACK:
1459                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1460         case NES_CM_STATE_TIME_WAIT:
1461                 cm_node->state = NES_CM_STATE_CLOSED;
1462                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1463                 drop_packet(skb);
1464                 break;
1465         default:
1466                 drop_packet(skb);
1467                 break;
1468         }
1469 }
1470
1471
1472 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1473 {
1474
1475         int     ret = 0;
1476         int datasize = skb->len;
1477         u8 *dataloc = skb->data;
1478
1479         enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1480         u32     res_type;
1481         ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1482         if (ret) {
1483                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1484                 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1485                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1486                                 "cm_node=%p listener=%p state=%d\n", __func__,
1487                                 __LINE__, cm_node, cm_node->listener,
1488                                 cm_node->state);
1489                         active_open_err(cm_node, skb, 1);
1490                 } else {
1491                         passive_open_err(cm_node, skb, 1);
1492                 }
1493                 return;
1494         }
1495
1496         switch (cm_node->state) {
1497         case NES_CM_STATE_ESTABLISHED:
1498                 if (res_type == NES_MPA_REQUEST_REJECT) {
1499                         /*BIG problem as we are receiving the MPA.. So should
1500                         * not be REJECT.. This is Passive Open.. We can
1501                         * only receive it Reject for Active Open...*/
1502                         WARN_ON(1);
1503                 }
1504                 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1505                 type = NES_CM_EVENT_MPA_REQ;
1506                 atomic_set(&cm_node->passive_state,
1507                                 NES_PASSIVE_STATE_INDICATED);
1508                 break;
1509         case NES_CM_STATE_MPAREQ_SENT:
1510                 cleanup_retrans_entry(cm_node);
1511                 if (res_type == NES_MPA_REQUEST_REJECT) {
1512                         type = NES_CM_EVENT_MPA_REJECT;
1513                         cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1514                 } else {
1515                         type = NES_CM_EVENT_CONNECTED;
1516                         cm_node->state = NES_CM_STATE_TSA;
1517                 }
1518
1519                 break;
1520         default:
1521                 WARN_ON(1);
1522                 break;
1523         }
1524         dev_kfree_skb_any(skb);
1525         create_event(cm_node, type);
1526 }
1527
1528 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1529 {
1530         switch (cm_node->state) {
1531         case NES_CM_STATE_SYN_SENT:
1532         case NES_CM_STATE_MPAREQ_SENT:
1533                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1534                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1535                         cm_node->listener, cm_node->state);
1536                 active_open_err(cm_node, skb, 1);
1537                 break;
1538         case NES_CM_STATE_ESTABLISHED:
1539         case NES_CM_STATE_SYN_RCVD:
1540                 passive_open_err(cm_node, skb, 1);
1541                 break;
1542         case NES_CM_STATE_TSA:
1543         default:
1544                 drop_packet(skb);
1545         }
1546 }
1547
1548 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1549         struct sk_buff *skb)
1550 {
1551         int err;
1552
1553         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1554         if (err)
1555                 active_open_err(cm_node, skb, 1);
1556
1557         return err;
1558 }
1559
1560 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1561         struct sk_buff *skb)
1562 {
1563         int err = 0;
1564         u32 seq;
1565         u32 ack_seq;
1566         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1567         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1568         u32 rcv_wnd;
1569         seq = ntohl(tcph->seq);
1570         ack_seq = ntohl(tcph->ack_seq);
1571         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1572         if (ack_seq != loc_seq_num)
1573                 err = 1;
1574         else if (!between(seq, rcv_nxt, (rcv_nxt+rcv_wnd)))
1575                 err = 1;
1576         if (err) {
1577                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1578                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1579                         cm_node->listener, cm_node->state);
1580                 indicate_pkt_err(cm_node, skb);
1581                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1582                         "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1583                         rcv_wnd);
1584         }
1585         return err;
1586 }
1587
1588 /*
1589  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1590  * is created with a listener or it may comein as rexmitted packet which in
1591  * that case will be just dropped.
1592  */
1593
1594 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1595         struct tcphdr *tcph)
1596 {
1597         int ret;
1598         u32 inc_sequence;
1599         int optionsize;
1600
1601         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1602         skb_trim(skb, 0);
1603         inc_sequence = ntohl(tcph->seq);
1604
1605         switch (cm_node->state) {
1606         case NES_CM_STATE_SYN_SENT:
1607         case NES_CM_STATE_MPAREQ_SENT:
1608                 /* Rcvd syn on active open connection*/
1609                 active_open_err(cm_node, skb, 1);
1610                 break;
1611         case NES_CM_STATE_LISTENING:
1612                 /* Passive OPEN */
1613                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1614                                 cm_node->listener->backlog) {
1615                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1616                                 "pressure \n");
1617                         cm_backlog_drops++;
1618                         passive_open_err(cm_node, skb, 0);
1619                         break;
1620                 }
1621                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1622                         1);
1623                 if (ret) {
1624                         passive_open_err(cm_node, skb, 0);
1625                         /* drop pkt */
1626                         break;
1627                 }
1628                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1629                 BUG_ON(cm_node->send_entry);
1630                 cm_node->accept_pend = 1;
1631                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1632
1633                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1634                 send_syn(cm_node, 1, skb);
1635                 break;
1636         case NES_CM_STATE_CLOSED:
1637                 cleanup_retrans_entry(cm_node);
1638                 add_ref_cm_node(cm_node);
1639                 send_reset(cm_node, skb);
1640                 break;
1641         case NES_CM_STATE_TSA:
1642         case NES_CM_STATE_ESTABLISHED:
1643         case NES_CM_STATE_FIN_WAIT1:
1644         case NES_CM_STATE_FIN_WAIT2:
1645         case NES_CM_STATE_MPAREQ_RCVD:
1646         case NES_CM_STATE_LAST_ACK:
1647         case NES_CM_STATE_CLOSING:
1648         case NES_CM_STATE_UNKNOWN:
1649         default:
1650                 drop_packet(skb);
1651                 break;
1652         }
1653 }
1654
1655 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1656         struct tcphdr *tcph)
1657 {
1658
1659         int ret;
1660         u32 inc_sequence;
1661         int optionsize;
1662
1663         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1664         skb_trim(skb, 0);
1665         inc_sequence = ntohl(tcph->seq);
1666         switch (cm_node->state) {
1667         case NES_CM_STATE_SYN_SENT:
1668                 cleanup_retrans_entry(cm_node);
1669                 /* active open */
1670                 if (check_syn(cm_node, tcph, skb))
1671                         return;
1672                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1673                 /* setup options */
1674                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1675                 if (ret) {
1676                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1677                                 cm_node);
1678                         break;
1679                 }
1680                 cleanup_retrans_entry(cm_node);
1681                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1682                 send_mpa_request(cm_node, skb);
1683                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1684                 break;
1685         case NES_CM_STATE_MPAREQ_RCVD:
1686                 /* passive open, so should not be here */
1687                 passive_open_err(cm_node, skb, 1);
1688                 break;
1689         case NES_CM_STATE_LISTENING:
1690                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1691                 cleanup_retrans_entry(cm_node);
1692                 cm_node->state = NES_CM_STATE_CLOSED;
1693                 send_reset(cm_node, skb);
1694                 break;
1695         case NES_CM_STATE_CLOSED:
1696                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1697                 cleanup_retrans_entry(cm_node);
1698                 add_ref_cm_node(cm_node);
1699                 send_reset(cm_node, skb);
1700                 break;
1701         case NES_CM_STATE_ESTABLISHED:
1702         case NES_CM_STATE_FIN_WAIT1:
1703         case NES_CM_STATE_FIN_WAIT2:
1704         case NES_CM_STATE_LAST_ACK:
1705         case NES_CM_STATE_TSA:
1706         case NES_CM_STATE_CLOSING:
1707         case NES_CM_STATE_UNKNOWN:
1708         case NES_CM_STATE_MPAREQ_SENT:
1709         default:
1710                 drop_packet(skb);
1711                 break;
1712         }
1713 }
1714
1715 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1716         struct tcphdr *tcph)
1717 {
1718         int datasize = 0;
1719         u32 inc_sequence;
1720         int ret = 0;
1721         int optionsize;
1722         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1723
1724         if (check_seq(cm_node, tcph, skb))
1725                 return -EINVAL;
1726
1727         skb_pull(skb, tcph->doff << 2);
1728         inc_sequence = ntohl(tcph->seq);
1729         datasize = skb->len;
1730         switch (cm_node->state) {
1731         case NES_CM_STATE_SYN_RCVD:
1732                 /* Passive OPEN */
1733                 cleanup_retrans_entry(cm_node);
1734                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1735                 if (ret)
1736                         break;
1737                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1738                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1739                 if (datasize) {
1740                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1741                         handle_rcv_mpa(cm_node, skb);
1742                 } else  /* rcvd ACK only */
1743                         dev_kfree_skb_any(skb);
1744                 break;
1745         case NES_CM_STATE_ESTABLISHED:
1746                 /* Passive OPEN */
1747                 cleanup_retrans_entry(cm_node);
1748                 if (datasize) {
1749                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1750                         handle_rcv_mpa(cm_node, skb);
1751                 } else
1752                         drop_packet(skb);
1753                 break;
1754         case NES_CM_STATE_MPAREQ_SENT:
1755                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1756                 if (datasize) {
1757                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1758                         handle_rcv_mpa(cm_node, skb);
1759                 } else  /* Could be just an ack pkt.. */
1760                         dev_kfree_skb_any(skb);
1761                 break;
1762         case NES_CM_STATE_LISTENING:
1763                 cleanup_retrans_entry(cm_node);
1764                 cm_node->state = NES_CM_STATE_CLOSED;
1765                 send_reset(cm_node, skb);
1766                 break;
1767         case NES_CM_STATE_CLOSED:
1768                 cleanup_retrans_entry(cm_node);
1769                 add_ref_cm_node(cm_node);
1770                 send_reset(cm_node, skb);
1771                 break;
1772         case NES_CM_STATE_LAST_ACK:
1773         case NES_CM_STATE_CLOSING:
1774                 cleanup_retrans_entry(cm_node);
1775                 cm_node->state = NES_CM_STATE_CLOSED;
1776                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1777                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1778                 drop_packet(skb);
1779                 break;
1780         case NES_CM_STATE_FIN_WAIT1:
1781                 cleanup_retrans_entry(cm_node);
1782                 drop_packet(skb);
1783                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1784                 break;
1785         case NES_CM_STATE_SYN_SENT:
1786         case NES_CM_STATE_FIN_WAIT2:
1787         case NES_CM_STATE_TSA:
1788         case NES_CM_STATE_MPAREQ_RCVD:
1789         case NES_CM_STATE_UNKNOWN:
1790         default:
1791                 cleanup_retrans_entry(cm_node);
1792                 drop_packet(skb);
1793                 break;
1794         }
1795         return ret;
1796 }
1797
1798
1799
1800 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1801         struct sk_buff *skb, int optionsize, int passive)
1802 {
1803         u8 *optionsloc = (u8 *)&tcph[1];
1804         if (optionsize) {
1805                 if (process_options(cm_node, optionsloc, optionsize,
1806                         (u32)tcph->syn)) {
1807                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
1808                                 __func__, cm_node);
1809                         if (passive)
1810                                 passive_open_err(cm_node, skb, 1);
1811                         else
1812                                 active_open_err(cm_node, skb, 1);
1813                         return 1;
1814                 }
1815         }
1816
1817         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1818                         cm_node->tcp_cntxt.snd_wscale;
1819
1820         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1821                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1822         return 0;
1823 }
1824
1825 /*
1826  * active_open_err() will send reset() if flag set..
1827  * It will also send ABORT event.
1828  */
1829
1830 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1831         int reset)
1832 {
1833         cleanup_retrans_entry(cm_node);
1834         if (reset) {
1835                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
1836                                 "state=%d\n", cm_node, cm_node->state);
1837                 add_ref_cm_node(cm_node);
1838                 send_reset(cm_node, skb);
1839         } else
1840                 dev_kfree_skb_any(skb);
1841
1842         cm_node->state = NES_CM_STATE_CLOSED;
1843         create_event(cm_node, NES_CM_EVENT_ABORTED);
1844 }
1845
1846 /*
1847  * passive_open_err() will either do a reset() or will free up the skb and
1848  * remove the cm_node.
1849  */
1850
1851 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1852         int reset)
1853 {
1854         cleanup_retrans_entry(cm_node);
1855         cm_node->state = NES_CM_STATE_CLOSED;
1856         if (reset) {
1857                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
1858                         "cm_node=%p state =%d\n", cm_node, cm_node->state);
1859                 send_reset(cm_node, skb);
1860         } else {
1861                 dev_kfree_skb_any(skb);
1862                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1863         }
1864 }
1865
1866 /*
1867  * free_retrans_entry() routines assumes that the retrans_list_lock has
1868  * been acquired before calling.
1869  */
1870 static void free_retrans_entry(struct nes_cm_node *cm_node)
1871 {
1872         struct nes_timer_entry *send_entry;
1873         send_entry = cm_node->send_entry;
1874         if (send_entry) {
1875                 cm_node->send_entry = NULL;
1876                 dev_kfree_skb_any(send_entry->skb);
1877                 kfree(send_entry);
1878                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1879         }
1880 }
1881
1882 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
1883 {
1884         unsigned long flags;
1885
1886         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1887         free_retrans_entry(cm_node);
1888         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1889 }
1890
1891 /**
1892  * process_packet
1893  * Returns skb if to be freed, else it will return NULL if already used..
1894  */
1895 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1896         struct nes_cm_core *cm_core)
1897 {
1898         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
1899         struct tcphdr *tcph = tcp_hdr(skb);
1900         u32     fin_set = 0;
1901         int ret = 0;
1902         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1903
1904         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1905                 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1906                 tcph->ack, tcph->rst, tcph->fin);
1907
1908         if (tcph->rst)
1909                 pkt_type = NES_PKT_TYPE_RST;
1910         else if (tcph->syn) {
1911                 pkt_type = NES_PKT_TYPE_SYN;
1912                 if (tcph->ack)
1913                         pkt_type = NES_PKT_TYPE_SYNACK;
1914         } else if (tcph->ack)
1915                 pkt_type = NES_PKT_TYPE_ACK;
1916         if (tcph->fin)
1917                 fin_set = 1;
1918
1919         switch (pkt_type) {
1920         case NES_PKT_TYPE_SYN:
1921                 handle_syn_pkt(cm_node, skb, tcph);
1922                 break;
1923         case NES_PKT_TYPE_SYNACK:
1924                 handle_synack_pkt(cm_node, skb, tcph);
1925                 break;
1926         case NES_PKT_TYPE_ACK:
1927                 ret = handle_ack_pkt(cm_node, skb, tcph);
1928                 if (fin_set && !ret)
1929                         handle_fin_pkt(cm_node);
1930                 break;
1931         case NES_PKT_TYPE_RST:
1932                 handle_rst_pkt(cm_node, skb, tcph);
1933                 break;
1934         default:
1935                 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
1936                         handle_fin_pkt(cm_node);
1937                 drop_packet(skb);
1938                 break;
1939         }
1940 }
1941
1942 /**
1943  * mini_cm_listen - create a listen node with params
1944  */
1945 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1946         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1947 {
1948         struct nes_cm_listener *listener;
1949         unsigned long flags;
1950
1951         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1952                 cm_info->loc_addr, cm_info->loc_port);
1953
1954         /* cannot have multiple matching listeners */
1955         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1956                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1957         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1958                 /* find automatically incs ref count ??? */
1959                 atomic_dec(&listener->ref_count);
1960                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1961                 return NULL;
1962         }
1963
1964         if (!listener) {
1965                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1966                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1967                 if (!listener) {
1968                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1969                         return NULL;
1970                 }
1971
1972                 listener->loc_addr = htonl(cm_info->loc_addr);
1973                 listener->loc_port = htons(cm_info->loc_port);
1974                 listener->reused_node = 0;
1975
1976                 atomic_set(&listener->ref_count, 1);
1977         }
1978         /* pasive case */
1979         /* find already inc'ed the ref count */
1980         else {
1981                 listener->reused_node = 1;
1982         }
1983
1984         listener->cm_id = cm_info->cm_id;
1985         atomic_set(&listener->pend_accepts_cnt, 0);
1986         listener->cm_core = cm_core;
1987         listener->nesvnic = nesvnic;
1988         atomic_inc(&cm_core->node_cnt);
1989
1990         listener->conn_type = cm_info->conn_type;
1991         listener->backlog = cm_info->backlog;
1992         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1993
1994         if (!listener->reused_node) {
1995                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1996                 list_add(&listener->list, &cm_core->listen_list.list);
1997                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1998                 atomic_inc(&cm_core->listen_node_cnt);
1999         }
2000
2001         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
2002                         " listener = %p, backlog = %d, cm_id = %p.\n",
2003                         cm_info->loc_addr, cm_info->loc_port,
2004                         listener, listener->backlog, listener->cm_id);
2005
2006         return listener;
2007 }
2008
2009
2010 /**
2011  * mini_cm_connect - make a connection node with params
2012  */
2013 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2014         struct nes_vnic *nesvnic, u16 private_data_len,
2015         void *private_data, struct nes_cm_info *cm_info)
2016 {
2017         int ret = 0;
2018         struct nes_cm_node *cm_node;
2019         struct nes_cm_listener *loopbackremotelistener;
2020         struct nes_cm_node *loopbackremotenode;
2021         struct nes_cm_info loopback_cm_info;
2022         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
2023         struct ietf_mpa_frame *mpa_frame = NULL;
2024
2025         /* create a CM connection node */
2026         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2027         if (!cm_node)
2028                 return NULL;
2029         mpa_frame = &cm_node->mpa_frame;
2030         memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
2031         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
2032         mpa_frame->rev =  IETF_MPA_VERSION;
2033         mpa_frame->priv_data_len = htons(private_data_len);
2034
2035         /* set our node side to client (active) side */
2036         cm_node->tcp_cntxt.client = 1;
2037         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2038
2039         if (cm_info->loc_addr == cm_info->rem_addr) {
2040                 loopbackremotelistener = find_listener(cm_core,
2041                                 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
2042                                 NES_CM_LISTENER_ACTIVE_STATE);
2043                 if (loopbackremotelistener == NULL) {
2044                         create_event(cm_node, NES_CM_EVENT_ABORTED);
2045                 } else {
2046                         loopback_cm_info = *cm_info;
2047                         loopback_cm_info.loc_port = cm_info->rem_port;
2048                         loopback_cm_info.rem_port = cm_info->loc_port;
2049                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2050                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
2051                                 &loopback_cm_info, loopbackremotelistener);
2052                         if (!loopbackremotenode) {
2053                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2054                                 return NULL;
2055                         }
2056                         atomic_inc(&cm_loopbacks);
2057                         loopbackremotenode->loopbackpartner = cm_node;
2058                         loopbackremotenode->tcp_cntxt.rcv_wscale =
2059                                 NES_CM_DEFAULT_RCV_WND_SCALE;
2060                         cm_node->loopbackpartner = loopbackremotenode;
2061                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2062                                 private_data_len);
2063                         loopbackremotenode->mpa_frame_size = private_data_len;
2064
2065                         /* we are done handling this state. */
2066                         /* set node to a TSA state */
2067                         cm_node->state = NES_CM_STATE_TSA;
2068                         cm_node->tcp_cntxt.rcv_nxt =
2069                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
2070                         loopbackremotenode->tcp_cntxt.rcv_nxt =
2071                                 cm_node->tcp_cntxt.loc_seq_num;
2072                         cm_node->tcp_cntxt.max_snd_wnd =
2073                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2074                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
2075                                 cm_node->tcp_cntxt.rcv_wnd;
2076                         cm_node->tcp_cntxt.snd_wnd =
2077                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2078                         loopbackremotenode->tcp_cntxt.snd_wnd =
2079                                 cm_node->tcp_cntxt.rcv_wnd;
2080                         cm_node->tcp_cntxt.snd_wscale =
2081                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
2082                         loopbackremotenode->tcp_cntxt.snd_wscale =
2083                                 cm_node->tcp_cntxt.rcv_wscale;
2084                         loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2085                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2086                 }
2087                 return cm_node;
2088         }
2089
2090         /* set our node side to client (active) side */
2091         cm_node->tcp_cntxt.client = 1;
2092         /* init our MPA frame ptr */
2093         memcpy(mpa_frame->priv_data, private_data, private_data_len);
2094
2095         cm_node->mpa_frame_size = mpa_frame_size;
2096
2097         /* send a syn and goto syn sent state */
2098         cm_node->state = NES_CM_STATE_SYN_SENT;
2099         ret = send_syn(cm_node, 0, NULL);
2100
2101         if (ret) {
2102                 /* error in sending the syn free up the cm_node struct */
2103                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2104                         "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2105                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2106                         cm_node->cm_id);
2107                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2108                 cm_node = NULL;
2109         }
2110
2111         if (cm_node)
2112                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2113                         "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2114                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2115                         cm_node->cm_id);
2116
2117         return cm_node;
2118 }
2119
2120
2121 /**
2122  * mini_cm_accept - accept a connection
2123  * This function is never called
2124  */
2125 static int mini_cm_accept(struct nes_cm_core *cm_core,
2126         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2127 {
2128         return 0;
2129 }
2130
2131
2132 /**
2133  * mini_cm_reject - reject and teardown a connection
2134  */
2135 static int mini_cm_reject(struct nes_cm_core *cm_core,
2136         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2137 {
2138         int ret = 0;
2139         int err = 0;
2140         int passive_state;
2141         struct nes_cm_event event;
2142         struct iw_cm_id *cm_id = cm_node->cm_id;
2143         struct nes_cm_node *loopback = cm_node->loopbackpartner;
2144
2145         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2146                 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2147
2148         if (cm_node->tcp_cntxt.client)
2149                 return ret;
2150         cleanup_retrans_entry(cm_node);
2151
2152         if (!loopback) {
2153                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2154                 if (passive_state == NES_SEND_RESET_EVENT) {
2155                         cm_node->state = NES_CM_STATE_CLOSED;
2156                         rem_ref_cm_node(cm_core, cm_node);
2157                 } else {
2158                         if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2159                                 rem_ref_cm_node(cm_core, cm_node);
2160                         } else {
2161                                 ret = send_mpa_reject(cm_node);
2162                                 if (ret) {
2163                                         cm_node->state = NES_CM_STATE_CLOSED;
2164                                         err = send_reset(cm_node, NULL);
2165                                         if (err)
2166                                                 WARN_ON(1);
2167                                 } else
2168                                         cm_id->add_ref(cm_id);
2169                         }
2170                 }
2171         } else {
2172                 cm_node->cm_id = NULL;
2173                 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2174                         rem_ref_cm_node(cm_core, cm_node);
2175                         rem_ref_cm_node(cm_core, loopback);
2176                 } else {
2177                         event.cm_node = loopback;
2178                         event.cm_info.rem_addr = loopback->rem_addr;
2179                         event.cm_info.loc_addr = loopback->loc_addr;
2180                         event.cm_info.rem_port = loopback->rem_port;
2181                         event.cm_info.loc_port = loopback->loc_port;
2182                         event.cm_info.cm_id = loopback->cm_id;
2183                         cm_event_mpa_reject(&event);
2184                         rem_ref_cm_node(cm_core, cm_node);
2185                         loopback->state = NES_CM_STATE_CLOSING;
2186
2187                         cm_id = loopback->cm_id;
2188                         rem_ref_cm_node(cm_core, loopback);
2189                         cm_id->rem_ref(cm_id);
2190                 }
2191         }
2192
2193         return ret;
2194 }
2195
2196
2197 /**
2198  * mini_cm_close
2199  */
2200 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2201 {
2202         int ret = 0;
2203
2204         if (!cm_core || !cm_node)
2205                 return -EINVAL;
2206
2207         switch (cm_node->state) {
2208         case NES_CM_STATE_SYN_RCVD:
2209         case NES_CM_STATE_SYN_SENT:
2210         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2211         case NES_CM_STATE_ESTABLISHED:
2212         case NES_CM_STATE_ACCEPTING:
2213         case NES_CM_STATE_MPAREQ_SENT:
2214         case NES_CM_STATE_MPAREQ_RCVD:
2215                 cleanup_retrans_entry(cm_node);
2216                 send_reset(cm_node, NULL);
2217                 break;
2218         case NES_CM_STATE_CLOSE_WAIT:
2219                 cm_node->state = NES_CM_STATE_LAST_ACK;
2220                 send_fin(cm_node, NULL);
2221                 break;
2222         case NES_CM_STATE_FIN_WAIT1:
2223         case NES_CM_STATE_FIN_WAIT2:
2224         case NES_CM_STATE_LAST_ACK:
2225         case NES_CM_STATE_TIME_WAIT:
2226         case NES_CM_STATE_CLOSING:
2227                 ret = -1;
2228                 break;
2229         case NES_CM_STATE_LISTENING:
2230                 cleanup_retrans_entry(cm_node);
2231                 send_reset(cm_node, NULL);
2232                 break;
2233         case NES_CM_STATE_MPAREJ_RCVD:
2234         case NES_CM_STATE_UNKNOWN:
2235         case NES_CM_STATE_INITED:
2236         case NES_CM_STATE_CLOSED:
2237         case NES_CM_STATE_LISTENER_DESTROYED:
2238                 ret = rem_ref_cm_node(cm_core, cm_node);
2239                 break;
2240         case NES_CM_STATE_TSA:
2241                 if (cm_node->send_entry)
2242                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2243                                 "send_entry=%p\n", cm_node->send_entry);
2244                 ret = rem_ref_cm_node(cm_core, cm_node);
2245                 break;
2246         }
2247         return ret;
2248 }
2249
2250
2251 /**
2252  * recv_pkt - recv an ETHERNET packet, and process it through CM
2253  * node state machine
2254  */
2255 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2256         struct nes_vnic *nesvnic, struct sk_buff *skb)
2257 {
2258         struct nes_cm_node *cm_node = NULL;
2259         struct nes_cm_listener *listener = NULL;
2260         struct iphdr *iph;
2261         struct tcphdr *tcph;
2262         struct nes_cm_info nfo;
2263         int skb_handled = 1;
2264         __be32 tmp_daddr, tmp_saddr;
2265
2266         if (!skb)
2267                 return 0;
2268         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2269                 return 0;
2270         }
2271
2272         iph = (struct iphdr *)skb->data;
2273         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2274
2275         nfo.loc_addr = ntohl(iph->daddr);
2276         nfo.loc_port = ntohs(tcph->dest);
2277         nfo.rem_addr = ntohl(iph->saddr);
2278         nfo.rem_port = ntohs(tcph->source);
2279
2280         tmp_daddr = cpu_to_be32(iph->daddr);
2281         tmp_saddr = cpu_to_be32(iph->saddr);
2282
2283         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2284                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2285
2286         do {
2287                 cm_node = find_node(cm_core,
2288                         nfo.rem_port, nfo.rem_addr,
2289                         nfo.loc_port, nfo.loc_addr);
2290
2291                 if (!cm_node) {
2292                         /* Only type of packet accepted are for */
2293                         /* the PASSIVE open (syn only) */
2294                         if ((!tcph->syn) || (tcph->ack)) {
2295                                 skb_handled = 0;
2296                                 break;
2297                         }
2298                         listener = find_listener(cm_core, nfo.loc_addr,
2299                                 nfo.loc_port,
2300                                 NES_CM_LISTENER_ACTIVE_STATE);
2301                         if (!listener) {
2302                                 nfo.cm_id = NULL;
2303                                 nfo.conn_type = 0;
2304                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2305                                 skb_handled = 0;
2306                                 break;
2307                         }
2308                         nfo.cm_id = listener->cm_id;
2309                         nfo.conn_type = listener->conn_type;
2310                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2311                                 listener);
2312                         if (!cm_node) {
2313                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2314                                         "node\n");
2315                                 cm_packets_dropped++;
2316                                 atomic_dec(&listener->ref_count);
2317                                 dev_kfree_skb_any(skb);
2318                                 break;
2319                         }
2320                         if (!tcph->rst && !tcph->fin) {
2321                                 cm_node->state = NES_CM_STATE_LISTENING;
2322                         } else {
2323                                 cm_packets_dropped++;
2324                                 rem_ref_cm_node(cm_core, cm_node);
2325                                 dev_kfree_skb_any(skb);
2326                                 break;
2327                         }
2328                         add_ref_cm_node(cm_node);
2329                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2330                         rem_ref_cm_node(cm_core, cm_node);
2331                         atomic_inc(&cm_accel_dropped_pkts);
2332                         dev_kfree_skb_any(skb);
2333                         break;
2334                 }
2335                 skb_reset_network_header(skb);
2336                 skb_set_transport_header(skb, sizeof(*tcph));
2337                 skb->len = ntohs(iph->tot_len);
2338                 process_packet(cm_node, skb, cm_core);
2339                 rem_ref_cm_node(cm_core, cm_node);
2340         } while (0);
2341         return skb_handled;
2342 }
2343
2344
2345 /**
2346  * nes_cm_alloc_core - allocate a top level instance of a cm core
2347  */
2348 static struct nes_cm_core *nes_cm_alloc_core(void)
2349 {
2350         struct nes_cm_core *cm_core;
2351
2352         /* setup the CM core */
2353         /* alloc top level core control structure */
2354         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2355         if (!cm_core)
2356                 return NULL;
2357
2358         INIT_LIST_HEAD(&cm_core->connected_nodes);
2359         init_timer(&cm_core->tcp_timer);
2360         cm_core->tcp_timer.function = nes_cm_timer_tick;
2361
2362         cm_core->mtu   = NES_CM_DEFAULT_MTU;
2363         cm_core->state = NES_CM_STATE_INITED;
2364         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2365
2366         atomic_set(&cm_core->events_posted, 0);
2367
2368         cm_core->api = &nes_cm_api;
2369
2370         spin_lock_init(&cm_core->ht_lock);
2371         spin_lock_init(&cm_core->listen_list_lock);
2372
2373         INIT_LIST_HEAD(&cm_core->listen_list.list);
2374
2375         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2376
2377         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2378         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2379         cm_core->post_event = nes_cm_post_event;
2380         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2381         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2382
2383         print_core(cm_core);
2384         return cm_core;
2385 }
2386
2387
2388 /**
2389  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2390  */
2391 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2392 {
2393         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2394
2395         if (!cm_core)
2396                 return -EINVAL;
2397
2398         barrier();
2399
2400         if (timer_pending(&cm_core->tcp_timer)) {
2401                 del_timer(&cm_core->tcp_timer);
2402         }
2403
2404         destroy_workqueue(cm_core->event_wq);
2405         destroy_workqueue(cm_core->disconn_wq);
2406         nes_debug(NES_DBG_CM, "\n");
2407         kfree(cm_core);
2408
2409         return 0;
2410 }
2411
2412
2413 /**
2414  * mini_cm_get
2415  */
2416 static int mini_cm_get(struct nes_cm_core *cm_core)
2417 {
2418         return cm_core->state;
2419 }
2420
2421
2422 /**
2423  * mini_cm_set
2424  */
2425 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2426 {
2427         int ret = 0;
2428
2429         switch (type) {
2430         case NES_CM_SET_PKT_SIZE:
2431                 cm_core->mtu = value;
2432                 break;
2433         case NES_CM_SET_FREE_PKT_Q_SIZE:
2434                 cm_core->free_tx_pkt_max = value;
2435                 break;
2436         default:
2437                 /* unknown set option */
2438                 ret = -EINVAL;
2439         }
2440
2441         return ret;
2442 }
2443
2444
2445 /**
2446  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2447  * successfully exchanged when this is called
2448  */
2449 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2450 {
2451         int ret = 0;
2452
2453         if (!nesqp)
2454                 return -EINVAL;
2455
2456         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2457                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2458                         NES_QPCONTEXT_MISC_DROS);
2459
2460         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2461                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2462
2463         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2464
2465         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2466
2467         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2468                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2469
2470         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2471                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2472                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2473
2474         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2475                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2476                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2477
2478         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2479         nesqp->nesqp_context->ts_recent = 0;
2480         nesqp->nesqp_context->ts_age = 0;
2481         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2482         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2483         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2484         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2485                         cm_node->tcp_cntxt.rcv_wscale);
2486         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2487         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2488         nesqp->nesqp_context->srtt = 0;
2489         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2490         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2491         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2492         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2493         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2494         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2495
2496         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2497                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2498                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2499                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2500                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2501                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2502                         le32_to_cpu(nesqp->nesqp_context->misc));
2503         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2504         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2505         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2506
2507         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2508         cm_node->state = NES_CM_STATE_TSA;
2509
2510         return ret;
2511 }
2512
2513
2514 /**
2515  * nes_cm_disconn
2516  */
2517 int nes_cm_disconn(struct nes_qp *nesqp)
2518 {
2519         struct disconn_work *work;
2520
2521         work = kzalloc(sizeof *work, GFP_ATOMIC);
2522         if (!work)
2523                 return -ENOMEM; /* Timer will clean up */
2524
2525         nes_add_ref(&nesqp->ibqp);
2526         work->nesqp = nesqp;
2527         INIT_WORK(&work->work, nes_disconnect_worker);
2528         queue_work(g_cm_core->disconn_wq, &work->work);
2529         return 0;
2530 }
2531
2532
2533 /**
2534  * nes_disconnect_worker
2535  */
2536 static void nes_disconnect_worker(struct work_struct *work)
2537 {
2538         struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2539         struct nes_qp *nesqp = dwork->nesqp;
2540
2541         kfree(dwork);
2542         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2543                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2544         nes_cm_disconn_true(nesqp);
2545         nes_rem_ref(&nesqp->ibqp);
2546 }
2547
2548
2549 /**
2550  * nes_cm_disconn_true
2551  */
2552 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2553 {
2554         unsigned long flags;
2555         int ret = 0;
2556         struct iw_cm_id *cm_id;
2557         struct iw_cm_event cm_event;
2558         struct nes_vnic *nesvnic;
2559         u16 last_ae;
2560         u8 original_hw_tcp_state;
2561         u8 original_ibqp_state;
2562         enum iw_cm_event_status disconn_status = IW_CM_EVENT_STATUS_OK;
2563         int issue_disconn = 0;
2564         int issue_close = 0;
2565         int issue_flush = 0;
2566         u32 flush_q = NES_CQP_FLUSH_RQ;
2567         struct ib_event ibevent;
2568
2569         if (!nesqp) {
2570                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2571                 return -1;
2572         }
2573
2574         spin_lock_irqsave(&nesqp->lock, flags);
2575         cm_id = nesqp->cm_id;
2576         /* make sure we havent already closed this connection */
2577         if (!cm_id) {
2578                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2579                                 nesqp->hwqp.qp_id);
2580                 spin_unlock_irqrestore(&nesqp->lock, flags);
2581                 return -1;
2582         }
2583
2584         nesvnic = to_nesvnic(nesqp->ibqp.device);
2585         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2586
2587         original_hw_tcp_state = nesqp->hw_tcp_state;
2588         original_ibqp_state   = nesqp->ibqp_state;
2589         last_ae = nesqp->last_aeq;
2590
2591         if (nesqp->term_flags) {
2592                 issue_disconn = 1;
2593                 issue_close = 1;
2594                 nesqp->cm_id = NULL;
2595                 if (nesqp->flush_issued == 0) {
2596                         nesqp->flush_issued = 1;
2597                         issue_flush = 1;
2598                 }
2599         } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2600                         ((original_ibqp_state == IB_QPS_RTS) &&
2601                         (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2602                 issue_disconn = 1;
2603                 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2604                         disconn_status = IW_CM_EVENT_STATUS_RESET;
2605         }
2606
2607         if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2608                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2609                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2610                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2611                 issue_close = 1;
2612                 nesqp->cm_id = NULL;
2613                 if (nesqp->flush_issued == 0) {
2614                         nesqp->flush_issued = 1;
2615                         issue_flush = 1;
2616                 }
2617         }
2618
2619         spin_unlock_irqrestore(&nesqp->lock, flags);
2620
2621         if ((issue_flush) && (nesqp->destroyed == 0)) {
2622                 /* Flush the queue(s) */
2623                 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2624                         flush_q |= NES_CQP_FLUSH_SQ;
2625                 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2626
2627                 if (nesqp->term_flags) {
2628                         ibevent.device = nesqp->ibqp.device;
2629                         ibevent.event = nesqp->terminate_eventtype;
2630                         ibevent.element.qp = &nesqp->ibqp;
2631                         nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2632                 }
2633         }
2634
2635         if ((cm_id) && (cm_id->event_handler)) {
2636                 if (issue_disconn) {
2637                         atomic_inc(&cm_disconnects);
2638                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2639                         cm_event.status = disconn_status;
2640                         cm_event.local_addr = cm_id->local_addr;
2641                         cm_event.remote_addr = cm_id->remote_addr;
2642                         cm_event.private_data = NULL;
2643                         cm_event.private_data_len = 0;
2644
2645                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2646                                 " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2647                                 "cm_id = %p, refcount = %u.\n",
2648                                 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2649                                 nesqp->hwqp.sq_tail, cm_id,
2650                                 atomic_read(&nesqp->refcount));
2651
2652                         ret = cm_id->event_handler(cm_id, &cm_event);
2653                         if (ret)
2654                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2655                                         "returned, ret=%d\n", ret);
2656                 }
2657
2658                 if (issue_close) {
2659                         atomic_inc(&cm_closes);
2660                         nes_disconnect(nesqp, 1);
2661
2662                         cm_id->provider_data = nesqp;
2663                         /* Send up the close complete event */
2664                         cm_event.event = IW_CM_EVENT_CLOSE;
2665                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2666                         cm_event.provider_data = cm_id->provider_data;
2667                         cm_event.local_addr = cm_id->local_addr;
2668                         cm_event.remote_addr = cm_id->remote_addr;
2669                         cm_event.private_data = NULL;
2670                         cm_event.private_data_len = 0;
2671
2672                         ret = cm_id->event_handler(cm_id, &cm_event);
2673                         if (ret) {
2674                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2675                         }
2676
2677                         cm_id->rem_ref(cm_id);
2678                 }
2679         }
2680
2681         return 0;
2682 }
2683
2684
2685 /**
2686  * nes_disconnect
2687  */
2688 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2689 {
2690         int ret = 0;
2691         struct nes_vnic *nesvnic;
2692         struct nes_device *nesdev;
2693         struct nes_ib_device *nesibdev;
2694
2695         nesvnic = to_nesvnic(nesqp->ibqp.device);
2696         if (!nesvnic)
2697                 return -EINVAL;
2698
2699         nesdev = nesvnic->nesdev;
2700         nesibdev = nesvnic->nesibdev;
2701
2702         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2703                         netdev_refcnt_read(nesvnic->netdev));
2704
2705         if (nesqp->active_conn) {
2706
2707                 /* indicate this connection is NOT active */
2708                 nesqp->active_conn = 0;
2709         } else {
2710                 /* Need to free the Last Streaming Mode Message */
2711                 if (nesqp->ietf_frame) {
2712                         if (nesqp->lsmm_mr)
2713                                 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2714                         pci_free_consistent(nesdev->pcidev,
2715                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2716                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2717                 }
2718         }
2719
2720         /* close the CM node down if it is still active */
2721         if (nesqp->cm_node) {
2722                 nes_debug(NES_DBG_CM, "Call close API\n");
2723
2724                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2725         }
2726
2727         return ret;
2728 }
2729
2730
2731 /**
2732  * nes_accept
2733  */
2734 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2735 {
2736         u64 u64temp;
2737         struct ib_qp *ibqp;
2738         struct nes_qp *nesqp;
2739         struct nes_vnic *nesvnic;
2740         struct nes_device *nesdev;
2741         struct nes_cm_node *cm_node;
2742         struct nes_adapter *adapter;
2743         struct ib_qp_attr attr;
2744         struct iw_cm_event cm_event;
2745         struct nes_hw_qp_wqe *wqe;
2746         struct nes_v4_quad nes_quad;
2747         u32 crc_value;
2748         int ret;
2749         int passive_state;
2750         struct nes_ib_device *nesibdev;
2751         struct ib_mr *ibmr = NULL;
2752         struct ib_phys_buf ibphysbuf;
2753         struct nes_pd *nespd;
2754         u64 tagged_offset;
2755
2756         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2757         if (!ibqp)
2758                 return -EINVAL;
2759
2760         /* get all our handles */
2761         nesqp = to_nesqp(ibqp);
2762         nesvnic = to_nesvnic(nesqp->ibqp.device);
2763         nesdev = nesvnic->nesdev;
2764         adapter = nesdev->nesadapter;
2765
2766         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2767         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2768                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2769                 nesvnic->netdev->name);
2770
2771         if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
2772                 if (cm_node->loopbackpartner)
2773                         rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
2774                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2775                 return -EINVAL;
2776         }
2777
2778         passive_state = atomic_add_return(1, &cm_node->passive_state);
2779         if (passive_state == NES_SEND_RESET_EVENT) {
2780                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2781                 return -ECONNRESET;
2782         }
2783
2784         /* associate the node with the QP */
2785         nesqp->cm_node = (void *)cm_node;
2786         cm_node->nesqp = nesqp;
2787
2788         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
2789                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2790         atomic_inc(&cm_accepts);
2791
2792         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2793                         netdev_refcnt_read(nesvnic->netdev));
2794
2795         /* allocate the ietf frame and space for private data */
2796         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2797                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2798                 &nesqp->ietf_frame_pbase);
2799
2800         if (!nesqp->ietf_frame) {
2801                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
2802                         "data\n");
2803                 return -ENOMEM;
2804         }
2805
2806
2807         /* setup the MPA frame */
2808         nesqp->private_data_len = conn_param->private_data_len;
2809         memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2810
2811         memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2812                         conn_param->private_data_len);
2813
2814         nesqp->ietf_frame->priv_data_len =
2815                 cpu_to_be16(conn_param->private_data_len);
2816         nesqp->ietf_frame->rev = mpa_version;
2817         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2818
2819         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2820         wqe = &nesqp->hwqp.sq_vbase[0];
2821
2822         if (cm_id->remote_addr.sin_addr.s_addr !=
2823                         cm_id->local_addr.sin_addr.s_addr) {
2824                 u64temp = (unsigned long)nesqp;
2825                 nesibdev = nesvnic->nesibdev;
2826                 nespd = nesqp->nespd;
2827                 ibphysbuf.addr = nesqp->ietf_frame_pbase;
2828                 ibphysbuf.size = conn_param->private_data_len +
2829                                         sizeof(struct ietf_mpa_frame);
2830                 tagged_offset = (u64)(unsigned long)nesqp->ietf_frame;
2831                 ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
2832                                                 &ibphysbuf, 1,
2833                                                 IB_ACCESS_LOCAL_WRITE,
2834                                                 &tagged_offset);
2835                 if (!ibmr) {
2836                         nes_debug(NES_DBG_CM, "Unable to register memory region"
2837                                         "for lSMM for cm_node = %p \n",
2838                                         cm_node);
2839                         pci_free_consistent(nesdev->pcidev,
2840                                 nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2841                                 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2842                         return -ENOMEM;
2843                 }
2844
2845                 ibmr->pd = &nespd->ibpd;
2846                 ibmr->device = nespd->ibpd.device;
2847                 nesqp->lsmm_mr = ibmr;
2848
2849                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2850                 set_wqe_64bit_value(wqe->wqe_words,
2851                         NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2852                         u64temp);
2853                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2854                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2855                         NES_IWARP_SQ_WQE_WRPDU);
2856                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2857                         cpu_to_le32(conn_param->private_data_len +
2858                         sizeof(struct ietf_mpa_frame));
2859                 set_wqe_64bit_value(wqe->wqe_words,
2860                                         NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
2861                                         (u64)(unsigned long)nesqp->ietf_frame);
2862                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2863                         cpu_to_le32(conn_param->private_data_len +
2864                         sizeof(struct ietf_mpa_frame));
2865                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
2866                 if (nesqp->sq_kmapped) {
2867                         nesqp->sq_kmapped = 0;
2868                         kunmap(nesqp->page);
2869                 }
2870
2871                 nesqp->nesqp_context->ird_ord_sizes |=
2872                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2873                         NES_QPCONTEXT_ORDIRD_WRPDU);
2874         } else {
2875                 nesqp->nesqp_context->ird_ord_sizes |=
2876                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
2877         }
2878         nesqp->skip_lsmm = 1;
2879
2880
2881         /* Cache the cm_id in the qp */
2882         nesqp->cm_id = cm_id;
2883         cm_node->cm_id = cm_id;
2884
2885         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2886         cm_id->provider_data = nesqp;
2887         nesqp->active_conn   = 0;
2888
2889         if (cm_node->state == NES_CM_STATE_TSA)
2890                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2891                         cm_node);
2892
2893         nes_cm_init_tsa_conn(nesqp, cm_node);
2894
2895         nesqp->nesqp_context->tcpPorts[0] =
2896                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2897         nesqp->nesqp_context->tcpPorts[1] =
2898                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2899
2900         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2901                 nesqp->nesqp_context->ip0 =
2902                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2903         else
2904                 nesqp->nesqp_context->ip0 =
2905                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2906
2907         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2908                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2909                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2910
2911         nesqp->nesqp_context->arp_index_vlan |=
2912                 cpu_to_le32(nes_arp_table(nesdev,
2913                         le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2914                         NES_ARP_RESOLVE) << 16);
2915
2916         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2917                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2918
2919         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2920
2921         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2922                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2923         nesqp->nesqp_context->ird_ord_sizes |=
2924                 cpu_to_le32((u32)conn_param->ord);
2925
2926         memset(&nes_quad, 0, sizeof(nes_quad));
2927         nes_quad.DstIpAdrIndex =
2928                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2929         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2930                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2931         else
2932                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2933         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2934         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2935
2936         /* Produce hash key */
2937         crc_value = get_crc_value(&nes_quad);
2938         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2939         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2940                 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2941
2942         nesqp->hte_index &= adapter->hte_index_mask;
2943         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2944
2945         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2946
2947         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2948                         "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2949                         "private data length=%zu.\n", nesqp->hwqp.qp_id,
2950                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2951                         ntohs(cm_id->remote_addr.sin_port),
2952                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2953                         ntohs(cm_id->local_addr.sin_port),
2954                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2955                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2956                         conn_param->private_data_len +
2957                         sizeof(struct ietf_mpa_frame));
2958
2959
2960         /* notify OF layer that accept event was successful */
2961         cm_id->add_ref(cm_id);
2962         nes_add_ref(&nesqp->ibqp);
2963
2964         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2965         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2966         cm_event.provider_data = (void *)nesqp;
2967         cm_event.local_addr = cm_id->local_addr;
2968         cm_event.remote_addr = cm_id->remote_addr;
2969         cm_event.private_data = NULL;
2970         cm_event.private_data_len = 0;
2971         ret = cm_id->event_handler(cm_id, &cm_event);
2972         attr.qp_state = IB_QPS_RTS;
2973         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2974         if (cm_node->loopbackpartner) {
2975                 cm_node->loopbackpartner->mpa_frame_size =
2976                         nesqp->private_data_len;
2977                 /* copy entire MPA frame to our cm_node's frame */
2978                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2979                         nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2980                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2981         }
2982         if (ret)
2983                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2984                         "ret=%d\n", __func__, __LINE__, ret);
2985
2986         return 0;
2987 }
2988
2989
2990 /**
2991  * nes_reject
2992  */
2993 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2994 {
2995         struct nes_cm_node *cm_node;
2996         struct nes_cm_node *loopback;
2997
2998         struct nes_cm_core *cm_core;
2999
3000         atomic_inc(&cm_rejects);
3001         cm_node = (struct nes_cm_node *) cm_id->provider_data;
3002         loopback = cm_node->loopbackpartner;
3003         cm_core = cm_node->cm_core;
3004         cm_node->cm_id = cm_id;
3005         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
3006
3007         if (cm_node->mpa_frame_size > MAX_CM_BUFFER)
3008                 return -EINVAL;
3009
3010         memcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
3011         if (loopback) {
3012                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3013                 loopback->mpa_frame.priv_data_len = pdata_len;
3014                 loopback->mpa_frame_size = sizeof(struct ietf_mpa_frame) +
3015                                 pdata_len;
3016         } else {
3017                 memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
3018                 cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
3019         }
3020
3021         cm_node->mpa_frame.rev = mpa_version;
3022         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
3023
3024         return cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
3025 }
3026
3027
3028 /**
3029  * nes_connect
3030  * setup and launch cm connect node
3031  */
3032 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3033 {
3034         struct ib_qp *ibqp;
3035         struct nes_qp *nesqp;
3036         struct nes_vnic *nesvnic;
3037         struct nes_device *nesdev;
3038         struct nes_cm_node *cm_node;
3039         struct nes_cm_info cm_info;
3040         int apbvt_set = 0;
3041
3042         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3043         if (!ibqp)
3044                 return -EINVAL;
3045         nesqp = to_nesqp(ibqp);
3046         if (!nesqp)
3047                 return -EINVAL;
3048         nesvnic = to_nesvnic(nesqp->ibqp.device);
3049         if (!nesvnic)
3050                 return -EINVAL;
3051         nesdev  = nesvnic->nesdev;
3052         if (!nesdev)
3053                 return -EINVAL;
3054
3055         if (!(cm_id->local_addr.sin_port) || !(cm_id->remote_addr.sin_port))
3056                 return -EINVAL;
3057
3058         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3059                 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3060                 ntohl(nesvnic->local_ipaddr),
3061                 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3062                 ntohs(cm_id->remote_addr.sin_port),
3063                 ntohl(cm_id->local_addr.sin_addr.s_addr),
3064                 ntohs(cm_id->local_addr.sin_port));
3065
3066         atomic_inc(&cm_connects);
3067         nesqp->active_conn = 1;
3068
3069         /* cache the cm_id in the qp */
3070         nesqp->cm_id = cm_id;
3071
3072         cm_id->provider_data = nesqp;
3073
3074         nesqp->private_data_len = conn_param->private_data_len;
3075         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
3076         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3077         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3078                 conn_param->private_data_len);
3079
3080         if (cm_id->local_addr.sin_addr.s_addr !=
3081                 cm_id->remote_addr.sin_addr.s_addr) {
3082                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3083                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3084                 apbvt_set = 1;
3085         }
3086
3087         /* set up the connection params for the node */
3088         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3089         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3090         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3091         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3092         cm_info.cm_id = cm_id;
3093         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3094
3095         cm_id->add_ref(cm_id);
3096
3097         /* create a connect CM node connection */
3098         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3099                 conn_param->private_data_len, (void *)conn_param->private_data,
3100                 &cm_info);
3101         if (!cm_node) {
3102                 if (apbvt_set)
3103                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3104                                 PCI_FUNC(nesdev->pcidev->devfn),
3105                                 NES_MANAGE_APBVT_DEL);
3106
3107                 cm_id->rem_ref(cm_id);
3108                 return -ENOMEM;
3109         }
3110
3111         cm_node->apbvt_set = apbvt_set;
3112         nesqp->cm_node = cm_node;
3113         cm_node->nesqp = nesqp;
3114         nes_add_ref(&nesqp->ibqp);
3115
3116         return 0;
3117 }
3118
3119
3120 /**
3121  * nes_create_listen
3122  */
3123 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3124 {
3125         struct nes_vnic *nesvnic;
3126         struct nes_cm_listener *cm_node;
3127         struct nes_cm_info cm_info;
3128         int err;
3129
3130         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3131                         cm_id, ntohs(cm_id->local_addr.sin_port));
3132
3133         nesvnic = to_nesvnic(cm_id->device);
3134         if (!nesvnic)
3135                 return -EINVAL;
3136
3137         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3138                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3139
3140         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3141                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3142
3143         /* setup listen params in our api call struct */
3144         cm_info.loc_addr = nesvnic->local_ipaddr;
3145         cm_info.loc_port = cm_id->local_addr.sin_port;
3146         cm_info.backlog = backlog;
3147         cm_info.cm_id = cm_id;
3148
3149         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3150
3151
3152         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3153         if (!cm_node) {
3154                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3155                                 __func__, __LINE__);
3156                 return -ENOMEM;
3157         }
3158
3159         cm_id->provider_data = cm_node;
3160
3161         if (!cm_node->reused_node) {
3162                 err = nes_manage_apbvt(nesvnic,
3163                         ntohs(cm_id->local_addr.sin_port),
3164                         PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3165                         NES_MANAGE_APBVT_ADD);
3166                 if (err) {
3167                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3168                                 err);
3169                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3170                         return err;
3171                 }
3172                 atomic_inc(&cm_listens_created);
3173         }
3174
3175         cm_id->add_ref(cm_id);
3176         cm_id->provider_data = (void *)cm_node;
3177
3178
3179         return 0;
3180 }
3181
3182
3183 /**
3184  * nes_destroy_listen
3185  */
3186 int nes_destroy_listen(struct iw_cm_id *cm_id)
3187 {
3188         if (cm_id->provider_data)
3189                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3190         else
3191                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3192
3193         cm_id->rem_ref(cm_id);
3194
3195         return 0;
3196 }
3197
3198
3199 /**
3200  * nes_cm_recv
3201  */
3202 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3203 {
3204         int rc = 0;
3205         cm_packets_received++;
3206         if ((g_cm_core) && (g_cm_core->api)) {
3207                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3208         } else {
3209                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3210                                 " cm is not setup properly.\n");
3211         }
3212
3213         return rc;
3214 }
3215
3216
3217 /**
3218  * nes_cm_start
3219  * Start and init a cm core module
3220  */
3221 int nes_cm_start(void)
3222 {
3223         nes_debug(NES_DBG_CM, "\n");
3224         /* create the primary CM core, pass this handle to subsequent core inits */
3225         g_cm_core = nes_cm_alloc_core();
3226         if (g_cm_core) {
3227                 return 0;
3228         } else {
3229                 return -ENOMEM;
3230         }
3231 }
3232
3233
3234 /**
3235  * nes_cm_stop
3236  * stop and dealloc all cm core instances
3237  */
3238 int nes_cm_stop(void)
3239 {
3240         g_cm_core->api->destroy_cm_core(g_cm_core);
3241         return 0;
3242 }
3243
3244
3245 /**
3246  * cm_event_connected
3247  * handle a connected event, setup QPs and HW
3248  */
3249 static void cm_event_connected(struct nes_cm_event *event)
3250 {
3251         u64 u64temp;
3252         struct nes_qp *nesqp;
3253         struct nes_vnic *nesvnic;
3254         struct nes_device *nesdev;
3255         struct nes_cm_node *cm_node;
3256         struct nes_adapter *nesadapter;
3257         struct ib_qp_attr attr;
3258         struct iw_cm_id *cm_id;
3259         struct iw_cm_event cm_event;
3260         struct nes_hw_qp_wqe *wqe;
3261         struct nes_v4_quad nes_quad;
3262         u32 crc_value;
3263         int ret;
3264
3265         /* get all our handles */
3266         cm_node = event->cm_node;
3267         cm_id = cm_node->cm_id;
3268         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3269         nesqp = (struct nes_qp *)cm_id->provider_data;
3270         nesvnic = to_nesvnic(nesqp->ibqp.device);
3271         nesdev = nesvnic->nesdev;
3272         nesadapter = nesdev->nesadapter;
3273
3274         if (nesqp->destroyed) {
3275                 return;
3276         }
3277         atomic_inc(&cm_connecteds);
3278         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3279                         " local port 0x%04X. jiffies = %lu.\n",
3280                         nesqp->hwqp.qp_id,
3281                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
3282                         ntohs(cm_id->remote_addr.sin_port),
3283                         ntohs(cm_id->local_addr.sin_port),
3284                         jiffies);
3285
3286         nes_cm_init_tsa_conn(nesqp, cm_node);
3287
3288         /* set the QP tsa context */
3289         nesqp->nesqp_context->tcpPorts[0] =
3290                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3291         nesqp->nesqp_context->tcpPorts[1] =
3292                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3293         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3294                 nesqp->nesqp_context->ip0 =
3295                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3296         else
3297                 nesqp->nesqp_context->ip0 =
3298                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3299
3300         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3301                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3302                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3303         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3304                         nes_arp_table(nesdev,
3305                         le32_to_cpu(nesqp->nesqp_context->ip0),
3306                         NULL, NES_ARP_RESOLVE) << 16);
3307         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3308                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3309         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3310         nesqp->nesqp_context->ird_ord_sizes |=
3311                         cpu_to_le32((u32)1 <<
3312                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3313
3314         /* Adjust tail for not having a LSMM */
3315         nesqp->hwqp.sq_tail = 1;
3316
3317 #if defined(NES_SEND_FIRST_WRITE)
3318         if (cm_node->send_write0) {
3319                 nes_debug(NES_DBG_CM, "Sending first write.\n");
3320                 wqe = &nesqp->hwqp.sq_vbase[0];
3321                 u64temp = (unsigned long)nesqp;
3322                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3323                 set_wqe_64bit_value(wqe->wqe_words,
3324                                 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3325                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3326                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3327                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3328                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3329                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3330                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3331                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3332
3333                 if (nesqp->sq_kmapped) {
3334                         nesqp->sq_kmapped = 0;
3335                         kunmap(nesqp->page);
3336                 }
3337
3338                 /* use the reserved spot on the WQ for the extra first WQE */
3339                 nesqp->nesqp_context->ird_ord_sizes &=
3340                         cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3341                                                 NES_QPCONTEXT_ORDIRD_WRPDU |
3342                                                 NES_QPCONTEXT_ORDIRD_ALSMM));
3343                 nesqp->skip_lsmm = 1;
3344                 nesqp->hwqp.sq_tail = 0;
3345                 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3346                                 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3347         }
3348 #endif
3349
3350         memset(&nes_quad, 0, sizeof(nes_quad));
3351
3352         nes_quad.DstIpAdrIndex =
3353                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3354         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3355                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3356         else
3357                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3358         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3359         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3360
3361         /* Produce hash key */
3362         crc_value = get_crc_value(&nes_quad);
3363         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3364         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3365                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3366
3367         nesqp->hte_index &= nesadapter->hte_index_mask;
3368         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3369
3370         nesqp->ietf_frame = &cm_node->mpa_frame;
3371         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3372         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3373
3374         /* notify OF layer we successfully created the requested connection */
3375         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3376         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
3377         cm_event.provider_data = cm_id->provider_data;
3378         cm_event.local_addr.sin_family = AF_INET;
3379         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3380         cm_event.remote_addr = cm_id->remote_addr;
3381
3382         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3383         cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3384
3385         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3386         ret = cm_id->event_handler(cm_id, &cm_event);
3387         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3388
3389         if (ret)
3390                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3391                         "ret=%d\n", __func__, __LINE__, ret);
3392         attr.qp_state = IB_QPS_RTS;
3393         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3394
3395         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3396                 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3397
3398         return;
3399 }
3400
3401
3402 /**
3403  * cm_event_connect_error
3404  */
3405 static void cm_event_connect_error(struct nes_cm_event *event)
3406 {
3407         struct nes_qp *nesqp;
3408         struct iw_cm_id *cm_id;
3409         struct iw_cm_event cm_event;
3410         /* struct nes_cm_info cm_info; */
3411         int ret;
3412
3413         if (!event->cm_node)
3414                 return;
3415
3416         cm_id = event->cm_node->cm_id;
3417         if (!cm_id) {
3418                 return;
3419         }
3420
3421         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3422         nesqp = cm_id->provider_data;
3423
3424         if (!nesqp) {
3425                 return;
3426         }
3427
3428         /* notify OF layer about this connection error event */
3429         /* cm_id->rem_ref(cm_id); */
3430         nesqp->cm_id = NULL;
3431         cm_id->provider_data = NULL;
3432         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3433         cm_event.status = -ECONNRESET;
3434         cm_event.provider_data = cm_id->provider_data;
3435         cm_event.local_addr = cm_id->local_addr;
3436         cm_event.remote_addr = cm_id->remote_addr;
3437         cm_event.private_data = NULL;
3438         cm_event.private_data_len = 0;
3439
3440         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3441                 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3442                 cm_event.remote_addr.sin_addr.s_addr);
3443
3444         ret = cm_id->event_handler(cm_id, &cm_event);
3445         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3446         if (ret)
3447                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3448                         "ret=%d\n", __func__, __LINE__, ret);
3449         cm_id->rem_ref(cm_id);
3450
3451         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3452         return;
3453 }
3454
3455
3456 /**
3457  * cm_event_reset
3458  */
3459 static void cm_event_reset(struct nes_cm_event *event)
3460 {
3461         struct nes_qp *nesqp;
3462         struct iw_cm_id *cm_id;
3463         struct iw_cm_event cm_event;
3464         /* struct nes_cm_info cm_info; */
3465         int ret;
3466
3467         if (!event->cm_node)
3468                 return;
3469
3470         if (!event->cm_node->cm_id)
3471                 return;
3472
3473         cm_id = event->cm_node->cm_id;
3474
3475         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3476         nesqp = cm_id->provider_data;
3477         if (!nesqp)
3478                 return;
3479
3480         nesqp->cm_id = NULL;
3481         /* cm_id->provider_data = NULL; */
3482         cm_event.event = IW_CM_EVENT_DISCONNECT;
3483         cm_event.status = IW_CM_EVENT_STATUS_RESET;
3484         cm_event.provider_data = cm_id->provider_data;
3485         cm_event.local_addr = cm_id->local_addr;
3486         cm_event.remote_addr = cm_id->remote_addr;
3487         cm_event.private_data = NULL;
3488         cm_event.private_data_len = 0;
3489
3490         cm_id->add_ref(cm_id);
3491         ret = cm_id->event_handler(cm_id, &cm_event);
3492         atomic_inc(&cm_closes);
3493         cm_event.event = IW_CM_EVENT_CLOSE;
3494         cm_event.status = IW_CM_EVENT_STATUS_OK;
3495         cm_event.provider_data = cm_id->provider_data;
3496         cm_event.local_addr = cm_id->local_addr;
3497         cm_event.remote_addr = cm_id->remote_addr;
3498         cm_event.private_data = NULL;
3499         cm_event.private_data_len = 0;
3500         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3501         ret = cm_id->event_handler(cm_id, &cm_event);
3502
3503         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3504
3505
3506         /* notify OF layer about this connection error event */
3507         cm_id->rem_ref(cm_id);
3508
3509         return;
3510 }
3511
3512
3513 /**
3514  * cm_event_mpa_req
3515  */
3516 static void cm_event_mpa_req(struct nes_cm_event *event)
3517 {
3518         struct iw_cm_id   *cm_id;
3519         struct iw_cm_event cm_event;
3520         int ret;
3521         struct nes_cm_node *cm_node;
3522
3523         cm_node = event->cm_node;
3524         if (!cm_node)
3525                 return;
3526         cm_id = cm_node->cm_id;
3527
3528         atomic_inc(&cm_connect_reqs);
3529         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3530                         cm_node, cm_id, jiffies);
3531
3532         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3533         cm_event.status = IW_CM_EVENT_STATUS_OK;
3534         cm_event.provider_data = (void *)cm_node;
3535
3536         cm_event.local_addr.sin_family = AF_INET;
3537         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3538         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3539
3540         cm_event.remote_addr.sin_family = AF_INET;
3541         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3542         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3543         cm_event.private_data = cm_node->mpa_frame_buf;
3544         cm_event.private_data_len  = (u8) cm_node->mpa_frame_size;
3545
3546         ret = cm_id->event_handler(cm_id, &cm_event);
3547         if (ret)
3548                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3549                                 __func__, __LINE__, ret);
3550         return;
3551 }
3552
3553
3554 static void cm_event_mpa_reject(struct nes_cm_event *event)
3555 {
3556         struct iw_cm_id   *cm_id;
3557         struct iw_cm_event cm_event;
3558         struct nes_cm_node *cm_node;
3559         int ret;
3560
3561         cm_node = event->cm_node;
3562         if (!cm_node)
3563                 return;
3564         cm_id = cm_node->cm_id;
3565
3566         atomic_inc(&cm_connect_reqs);
3567         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3568                         cm_node, cm_id, jiffies);
3569
3570         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3571         cm_event.status = -ECONNREFUSED;
3572         cm_event.provider_data = cm_id->provider_data;
3573
3574         cm_event.local_addr.sin_family = AF_INET;
3575         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3576         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3577
3578         cm_event.remote_addr.sin_family = AF_INET;
3579         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3580         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3581
3582         cm_event.private_data = cm_node->mpa_frame_buf;
3583         cm_event.private_data_len = (u8) cm_node->mpa_frame_size;
3584
3585         nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3586                         "remove_addr=%08x\n",
3587                         cm_event.local_addr.sin_addr.s_addr,
3588                         cm_event.remote_addr.sin_addr.s_addr);
3589
3590         ret = cm_id->event_handler(cm_id, &cm_event);
3591         if (ret)
3592                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3593                                 __func__, __LINE__, ret);
3594
3595         return;
3596 }
3597
3598
3599 static void nes_cm_event_handler(struct work_struct *);
3600
3601 /**
3602  * nes_cm_post_event
3603  * post an event to the cm event handler
3604  */
3605 static int nes_cm_post_event(struct nes_cm_event *event)
3606 {
3607         atomic_inc(&event->cm_node->cm_core->events_posted);
3608         add_ref_cm_node(event->cm_node);
3609         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3610         INIT_WORK(&event->event_work, nes_cm_event_handler);
3611         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3612                 event->cm_node, event);
3613
3614         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3615
3616         nes_debug(NES_DBG_CM, "Exit\n");
3617         return 0;
3618 }
3619
3620
3621 /**
3622  * nes_cm_event_handler
3623  * worker function to handle cm events
3624  * will free instance of nes_cm_event
3625  */
3626 static void nes_cm_event_handler(struct work_struct *work)
3627 {
3628         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3629                         event_work);
3630         struct nes_cm_core *cm_core;
3631
3632         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3633                 return;
3634
3635         cm_core = event->cm_node->cm_core;
3636         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3637                 event, event->type, atomic_read(&cm_core->events_posted));
3638
3639         switch (event->type) {
3640         case NES_CM_EVENT_MPA_REQ:
3641                 cm_event_mpa_req(event);
3642                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3643                         event->cm_node);
3644                 break;
3645         case NES_CM_EVENT_RESET:
3646                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3647                         event->cm_node);
3648                 cm_event_reset(event);
3649                 break;
3650         case NES_CM_EVENT_CONNECTED:
3651                 if ((!event->cm_node->cm_id) ||
3652                         (event->cm_node->state != NES_CM_STATE_TSA))
3653                         break;
3654                 cm_event_connected(event);
3655                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3656                 break;
3657         case NES_CM_EVENT_MPA_REJECT:
3658                 if ((!event->cm_node->cm_id) ||
3659                                 (event->cm_node->state == NES_CM_STATE_TSA))
3660                         break;
3661                 cm_event_mpa_reject(event);
3662                 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3663                 break;
3664
3665         case NES_CM_EVENT_ABORTED:
3666                 if ((!event->cm_node->cm_id) ||
3667                         (event->cm_node->state == NES_CM_STATE_TSA))
3668                         break;
3669                 cm_event_connect_error(event);
3670                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3671                 break;
3672         case NES_CM_EVENT_DROPPED_PKT:
3673                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3674                 break;
3675         default:
3676                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3677                 break;
3678         }
3679
3680         atomic_dec(&cm_core->events_posted);
3681         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3682         rem_ref_cm_node(cm_core, event->cm_node);
3683         kfree(event);
3684
3685         return;
3686 }