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 neighbour *neigh;
1108         int rc = arpindex;
1109         struct net_device *netdev;
1110         struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1111
1112         rt = ip_route_output(&init_net, htonl(dst_ip), 0, 0, 0);
1113         if (IS_ERR(rt)) {
1114                 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1115                                 __func__, dst_ip);
1116                 return rc;
1117         }
1118
1119         if (netif_is_bond_slave(nesvnic->netdev))
1120                 netdev = nesvnic->netdev->master;
1121         else
1122                 netdev = nesvnic->netdev;
1123
1124         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, netdev);
1125         if (neigh) {
1126                 if (neigh->nud_state & NUD_VALID) {
1127                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1128                                   " is %pM, Gateway is 0x%08X \n", dst_ip,
1129                                   neigh->ha, ntohl(rt->rt_gateway));
1130
1131                         if (arpindex >= 0) {
1132                                 if (!memcmp(nesadapter->arp_table[arpindex].mac_addr,
1133                                                         neigh->ha, ETH_ALEN)){
1134                                         /* Mac address same as in nes_arp_table */
1135                                         neigh_release(neigh);
1136                                         ip_rt_put(rt);
1137                                         return rc;
1138                                 }
1139
1140                                 nes_manage_arp_cache(nesvnic->netdev,
1141                                                 nesadapter->arp_table[arpindex].mac_addr,
1142                                                 dst_ip, NES_ARP_DELETE);
1143                         }
1144
1145                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1146                                              dst_ip, NES_ARP_ADD);
1147                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1148                                            NES_ARP_RESOLVE);
1149                 }
1150                 neigh_release(neigh);
1151         }
1152
1153         if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
1154                 neigh_event_send(dst_get_neighbour(&rt->dst), NULL);
1155
1156         ip_rt_put(rt);
1157         return rc;
1158 }
1159
1160 /**
1161  * make_cm_node - create a new instance of a cm node
1162  */
1163 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1164                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1165                 struct nes_cm_listener *listener)
1166 {
1167         struct nes_cm_node *cm_node;
1168         struct timespec ts;
1169         int oldarpindex = 0;
1170         int arpindex = 0;
1171         struct nes_device *nesdev;
1172         struct nes_adapter *nesadapter;
1173
1174         /* create an hte and cm_node for this instance */
1175         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1176         if (!cm_node)
1177                 return NULL;
1178
1179         /* set our node specific transport info */
1180         cm_node->loc_addr = cm_info->loc_addr;
1181         cm_node->rem_addr = cm_info->rem_addr;
1182         cm_node->loc_port = cm_info->loc_port;
1183         cm_node->rem_port = cm_info->rem_port;
1184         cm_node->send_write0 = send_first;
1185         nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1186                   &cm_node->loc_addr, cm_node->loc_port,
1187                   &cm_node->rem_addr, cm_node->rem_port);
1188         cm_node->listener = listener;
1189         cm_node->netdev = nesvnic->netdev;
1190         cm_node->cm_id = cm_info->cm_id;
1191         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1192
1193         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1194                         cm_node->cm_id);
1195
1196         spin_lock_init(&cm_node->retrans_list_lock);
1197
1198         cm_node->loopbackpartner = NULL;
1199         atomic_set(&cm_node->ref_count, 1);
1200         /* associate our parent CM core */
1201         cm_node->cm_core = cm_core;
1202         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1203         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1204         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1205                         NES_CM_DEFAULT_RCV_WND_SCALE;
1206         ts = current_kernel_time();
1207         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1208         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1209                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1210         cm_node->tcp_cntxt.rcv_nxt = 0;
1211         /* get a unique session ID , add thread_id to an upcounter to handle race */
1212         atomic_inc(&cm_core->node_cnt);
1213         cm_node->conn_type = cm_info->conn_type;
1214         cm_node->apbvt_set = 0;
1215         cm_node->accept_pend = 0;
1216
1217         cm_node->nesvnic = nesvnic;
1218         /* get some device handles, for arp lookup */
1219         nesdev = nesvnic->nesdev;
1220         nesadapter = nesdev->nesadapter;
1221
1222         cm_node->loopbackpartner = NULL;
1223
1224         /* get the mac addr for the remote node */
1225         if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
1226                 arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1227         else {
1228                 oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1229                 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr, oldarpindex);
1230
1231         }
1232         if (arpindex < 0) {
1233                 kfree(cm_node);
1234                 return NULL;
1235         }
1236
1237         /* copy the mac addr to node context */
1238         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1239         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1240                   cm_node->rem_mac);
1241
1242         add_hte_node(cm_core, cm_node);
1243         atomic_inc(&cm_nodes_created);
1244
1245         return cm_node;
1246 }
1247
1248
1249 /**
1250  * add_ref_cm_node - destroy an instance of a cm node
1251  */
1252 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1253 {
1254         atomic_inc(&cm_node->ref_count);
1255         return 0;
1256 }
1257
1258
1259 /**
1260  * rem_ref_cm_node - destroy an instance of a cm node
1261  */
1262 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1263         struct nes_cm_node *cm_node)
1264 {
1265         unsigned long flags;
1266         struct nes_qp *nesqp;
1267
1268         if (!cm_node)
1269                 return -EINVAL;
1270
1271         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1272         if (atomic_dec_return(&cm_node->ref_count)) {
1273                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1274                 return 0;
1275         }
1276         list_del(&cm_node->list);
1277         atomic_dec(&cm_core->ht_node_cnt);
1278         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1279
1280         /* if the node is destroyed before connection was accelerated */
1281         if (!cm_node->accelerated && cm_node->accept_pend) {
1282                 BUG_ON(!cm_node->listener);
1283                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1284                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1285         }
1286         WARN_ON(cm_node->send_entry);
1287         if (cm_node->recv_entry)
1288                 handle_recv_entry(cm_node, 0);
1289         if (cm_node->listener) {
1290                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1291         } else {
1292                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1293                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1294                                 PCI_FUNC(
1295                                 cm_node->nesvnic->nesdev->pcidev->devfn),
1296                                 NES_MANAGE_APBVT_DEL);
1297                 }
1298         }
1299
1300         atomic_dec(&cm_core->node_cnt);
1301         atomic_inc(&cm_nodes_destroyed);
1302         nesqp = cm_node->nesqp;
1303         if (nesqp) {
1304                 nesqp->cm_node = NULL;
1305                 nes_rem_ref(&nesqp->ibqp);
1306                 cm_node->nesqp = NULL;
1307         }
1308
1309         kfree(cm_node);
1310         return 0;
1311 }
1312
1313 /**
1314  * process_options
1315  */
1316 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1317         u32 optionsize, u32 syn_packet)
1318 {
1319         u32 tmp;
1320         u32 offset = 0;
1321         union all_known_options *all_options;
1322         char got_mss_option = 0;
1323
1324         while (offset < optionsize) {
1325                 all_options = (union all_known_options *)(optionsloc + offset);
1326                 switch (all_options->as_base.optionnum) {
1327                 case OPTION_NUMBER_END:
1328                         offset = optionsize;
1329                         break;
1330                 case OPTION_NUMBER_NONE:
1331                         offset += 1;
1332                         continue;
1333                 case OPTION_NUMBER_MSS:
1334                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1335                                 "Size: %d\n", __func__,
1336                                 all_options->as_mss.length, offset, optionsize);
1337                         got_mss_option = 1;
1338                         if (all_options->as_mss.length != 4) {
1339                                 return 1;
1340                         } else {
1341                                 tmp = ntohs(all_options->as_mss.mss);
1342                                 if (tmp > 0 && tmp <
1343                                         cm_node->tcp_cntxt.mss)
1344                                         cm_node->tcp_cntxt.mss = tmp;
1345                         }
1346                         break;
1347                 case OPTION_NUMBER_WINDOW_SCALE:
1348                         cm_node->tcp_cntxt.snd_wscale =
1349                                 all_options->as_windowscale.shiftcount;
1350                         break;
1351                 case OPTION_NUMBER_WRITE0:
1352                         cm_node->send_write0 = 1;
1353                         break;
1354                 default:
1355                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1356                                 all_options->as_base.optionnum);
1357                         break;
1358                 }
1359                 offset += all_options->as_base.length;
1360         }
1361         if ((!got_mss_option) && (syn_packet))
1362                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1363         return 0;
1364 }
1365
1366 static void drop_packet(struct sk_buff *skb)
1367 {
1368         atomic_inc(&cm_accel_dropped_pkts);
1369         dev_kfree_skb_any(skb);
1370 }
1371
1372 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1373 {
1374         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1375                 "refcnt=%d\n", cm_node, cm_node->state,
1376                 atomic_read(&cm_node->ref_count));
1377         switch (cm_node->state) {
1378         case NES_CM_STATE_SYN_RCVD:
1379         case NES_CM_STATE_SYN_SENT:
1380         case NES_CM_STATE_ESTABLISHED:
1381         case NES_CM_STATE_MPAREJ_RCVD:
1382                 cm_node->tcp_cntxt.rcv_nxt++;
1383                 cleanup_retrans_entry(cm_node);
1384                 cm_node->state = NES_CM_STATE_LAST_ACK;
1385                 send_fin(cm_node, NULL);
1386                 break;
1387         case NES_CM_STATE_MPAREQ_SENT:
1388                 create_event(cm_node, NES_CM_EVENT_ABORTED);
1389                 cm_node->tcp_cntxt.rcv_nxt++;
1390                 cleanup_retrans_entry(cm_node);
1391                 cm_node->state = NES_CM_STATE_CLOSED;
1392                 add_ref_cm_node(cm_node);
1393                 send_reset(cm_node, NULL);
1394                 break;
1395         case NES_CM_STATE_FIN_WAIT1:
1396                 cm_node->tcp_cntxt.rcv_nxt++;
1397                 cleanup_retrans_entry(cm_node);
1398                 cm_node->state = NES_CM_STATE_CLOSING;
1399                 send_ack(cm_node, NULL);
1400                 /* Wait for ACK as this is simultaneous close..
1401                 * After we receive ACK, do not send anything..
1402                 * Just rm the node.. Done.. */
1403                 break;
1404         case NES_CM_STATE_FIN_WAIT2:
1405                 cm_node->tcp_cntxt.rcv_nxt++;
1406                 cleanup_retrans_entry(cm_node);
1407                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1408                 send_ack(cm_node, NULL);
1409                 schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
1410                 break;
1411         case NES_CM_STATE_TIME_WAIT:
1412                 cm_node->tcp_cntxt.rcv_nxt++;
1413                 cleanup_retrans_entry(cm_node);
1414                 cm_node->state = NES_CM_STATE_CLOSED;
1415                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1416                 break;
1417         case NES_CM_STATE_TSA:
1418         default:
1419                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1420                         cm_node, cm_node->state);
1421                 break;
1422         }
1423 }
1424
1425
1426 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1427         struct tcphdr *tcph)
1428 {
1429
1430         int     reset = 0;      /* whether to send reset in case of err.. */
1431         atomic_inc(&cm_resets_recvd);
1432         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1433                         " refcnt=%d\n", cm_node, cm_node->state,
1434                         atomic_read(&cm_node->ref_count));
1435         cleanup_retrans_entry(cm_node);
1436         switch (cm_node->state) {
1437         case NES_CM_STATE_SYN_SENT:
1438         case NES_CM_STATE_MPAREQ_SENT:
1439                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1440                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1441                         cm_node->listener, cm_node->state);
1442                 active_open_err(cm_node, skb, reset);
1443                 break;
1444         case NES_CM_STATE_MPAREQ_RCVD:
1445                 atomic_inc(&cm_node->passive_state);
1446                 dev_kfree_skb_any(skb);
1447                 break;
1448         case NES_CM_STATE_ESTABLISHED:
1449         case NES_CM_STATE_SYN_RCVD:
1450         case NES_CM_STATE_LISTENING:
1451                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1452                 passive_open_err(cm_node, skb, reset);
1453                 break;
1454         case NES_CM_STATE_TSA:
1455                 active_open_err(cm_node, skb, reset);
1456                 break;
1457         case NES_CM_STATE_CLOSED:
1458                 drop_packet(skb);
1459                 break;
1460         case NES_CM_STATE_FIN_WAIT2:
1461         case NES_CM_STATE_FIN_WAIT1:
1462         case NES_CM_STATE_LAST_ACK:
1463                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1464         case NES_CM_STATE_TIME_WAIT:
1465                 cm_node->state = NES_CM_STATE_CLOSED;
1466                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1467                 drop_packet(skb);
1468                 break;
1469         default:
1470                 drop_packet(skb);
1471                 break;
1472         }
1473 }
1474
1475
1476 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1477 {
1478
1479         int     ret = 0;
1480         int datasize = skb->len;
1481         u8 *dataloc = skb->data;
1482
1483         enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1484         u32     res_type;
1485         ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1486         if (ret) {
1487                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1488                 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1489                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1490                                 "cm_node=%p listener=%p state=%d\n", __func__,
1491                                 __LINE__, cm_node, cm_node->listener,
1492                                 cm_node->state);
1493                         active_open_err(cm_node, skb, 1);
1494                 } else {
1495                         passive_open_err(cm_node, skb, 1);
1496                 }
1497                 return;
1498         }
1499
1500         switch (cm_node->state) {
1501         case NES_CM_STATE_ESTABLISHED:
1502                 if (res_type == NES_MPA_REQUEST_REJECT) {
1503                         /*BIG problem as we are receiving the MPA.. So should
1504                         * not be REJECT.. This is Passive Open.. We can
1505                         * only receive it Reject for Active Open...*/
1506                         WARN_ON(1);
1507                 }
1508                 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1509                 type = NES_CM_EVENT_MPA_REQ;
1510                 atomic_set(&cm_node->passive_state,
1511                                 NES_PASSIVE_STATE_INDICATED);
1512                 break;
1513         case NES_CM_STATE_MPAREQ_SENT:
1514                 cleanup_retrans_entry(cm_node);
1515                 if (res_type == NES_MPA_REQUEST_REJECT) {
1516                         type = NES_CM_EVENT_MPA_REJECT;
1517                         cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1518                 } else {
1519                         type = NES_CM_EVENT_CONNECTED;
1520                         cm_node->state = NES_CM_STATE_TSA;
1521                 }
1522
1523                 break;
1524         default:
1525                 WARN_ON(1);
1526                 break;
1527         }
1528         dev_kfree_skb_any(skb);
1529         create_event(cm_node, type);
1530 }
1531
1532 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1533 {
1534         switch (cm_node->state) {
1535         case NES_CM_STATE_SYN_SENT:
1536         case NES_CM_STATE_MPAREQ_SENT:
1537                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1538                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1539                         cm_node->listener, cm_node->state);
1540                 active_open_err(cm_node, skb, 1);
1541                 break;
1542         case NES_CM_STATE_ESTABLISHED:
1543         case NES_CM_STATE_SYN_RCVD:
1544                 passive_open_err(cm_node, skb, 1);
1545                 break;
1546         case NES_CM_STATE_TSA:
1547         default:
1548                 drop_packet(skb);
1549         }
1550 }
1551
1552 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1553         struct sk_buff *skb)
1554 {
1555         int err;
1556
1557         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1558         if (err)
1559                 active_open_err(cm_node, skb, 1);
1560
1561         return err;
1562 }
1563
1564 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1565         struct sk_buff *skb)
1566 {
1567         int err = 0;
1568         u32 seq;
1569         u32 ack_seq;
1570         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1571         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1572         u32 rcv_wnd;
1573         seq = ntohl(tcph->seq);
1574         ack_seq = ntohl(tcph->ack_seq);
1575         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1576         if (ack_seq != loc_seq_num)
1577                 err = 1;
1578         else if (!between(seq, rcv_nxt, (rcv_nxt+rcv_wnd)))
1579                 err = 1;
1580         if (err) {
1581                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1582                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1583                         cm_node->listener, cm_node->state);
1584                 indicate_pkt_err(cm_node, skb);
1585                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1586                         "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1587                         rcv_wnd);
1588         }
1589         return err;
1590 }
1591
1592 /*
1593  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1594  * is created with a listener or it may comein as rexmitted packet which in
1595  * that case will be just dropped.
1596  */
1597
1598 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1599         struct tcphdr *tcph)
1600 {
1601         int ret;
1602         u32 inc_sequence;
1603         int optionsize;
1604
1605         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1606         skb_trim(skb, 0);
1607         inc_sequence = ntohl(tcph->seq);
1608
1609         switch (cm_node->state) {
1610         case NES_CM_STATE_SYN_SENT:
1611         case NES_CM_STATE_MPAREQ_SENT:
1612                 /* Rcvd syn on active open connection*/
1613                 active_open_err(cm_node, skb, 1);
1614                 break;
1615         case NES_CM_STATE_LISTENING:
1616                 /* Passive OPEN */
1617                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1618                                 cm_node->listener->backlog) {
1619                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1620                                 "pressure \n");
1621                         cm_backlog_drops++;
1622                         passive_open_err(cm_node, skb, 0);
1623                         break;
1624                 }
1625                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1626                         1);
1627                 if (ret) {
1628                         passive_open_err(cm_node, skb, 0);
1629                         /* drop pkt */
1630                         break;
1631                 }
1632                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1633                 BUG_ON(cm_node->send_entry);
1634                 cm_node->accept_pend = 1;
1635                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1636
1637                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1638                 send_syn(cm_node, 1, skb);
1639                 break;
1640         case NES_CM_STATE_CLOSED:
1641                 cleanup_retrans_entry(cm_node);
1642                 add_ref_cm_node(cm_node);
1643                 send_reset(cm_node, skb);
1644                 break;
1645         case NES_CM_STATE_TSA:
1646         case NES_CM_STATE_ESTABLISHED:
1647         case NES_CM_STATE_FIN_WAIT1:
1648         case NES_CM_STATE_FIN_WAIT2:
1649         case NES_CM_STATE_MPAREQ_RCVD:
1650         case NES_CM_STATE_LAST_ACK:
1651         case NES_CM_STATE_CLOSING:
1652         case NES_CM_STATE_UNKNOWN:
1653         default:
1654                 drop_packet(skb);
1655                 break;
1656         }
1657 }
1658
1659 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1660         struct tcphdr *tcph)
1661 {
1662
1663         int ret;
1664         u32 inc_sequence;
1665         int optionsize;
1666
1667         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1668         skb_trim(skb, 0);
1669         inc_sequence = ntohl(tcph->seq);
1670         switch (cm_node->state) {
1671         case NES_CM_STATE_SYN_SENT:
1672                 cleanup_retrans_entry(cm_node);
1673                 /* active open */
1674                 if (check_syn(cm_node, tcph, skb))
1675                         return;
1676                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1677                 /* setup options */
1678                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1679                 if (ret) {
1680                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1681                                 cm_node);
1682                         break;
1683                 }
1684                 cleanup_retrans_entry(cm_node);
1685                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1686                 send_mpa_request(cm_node, skb);
1687                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1688                 break;
1689         case NES_CM_STATE_MPAREQ_RCVD:
1690                 /* passive open, so should not be here */
1691                 passive_open_err(cm_node, skb, 1);
1692                 break;
1693         case NES_CM_STATE_LISTENING:
1694                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1695                 cleanup_retrans_entry(cm_node);
1696                 cm_node->state = NES_CM_STATE_CLOSED;
1697                 send_reset(cm_node, skb);
1698                 break;
1699         case NES_CM_STATE_CLOSED:
1700                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1701                 cleanup_retrans_entry(cm_node);
1702                 add_ref_cm_node(cm_node);
1703                 send_reset(cm_node, skb);
1704                 break;
1705         case NES_CM_STATE_ESTABLISHED:
1706         case NES_CM_STATE_FIN_WAIT1:
1707         case NES_CM_STATE_FIN_WAIT2:
1708         case NES_CM_STATE_LAST_ACK:
1709         case NES_CM_STATE_TSA:
1710         case NES_CM_STATE_CLOSING:
1711         case NES_CM_STATE_UNKNOWN:
1712         case NES_CM_STATE_MPAREQ_SENT:
1713         default:
1714                 drop_packet(skb);
1715                 break;
1716         }
1717 }
1718
1719 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1720         struct tcphdr *tcph)
1721 {
1722         int datasize = 0;
1723         u32 inc_sequence;
1724         int ret = 0;
1725         int optionsize;
1726         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1727
1728         if (check_seq(cm_node, tcph, skb))
1729                 return -EINVAL;
1730
1731         skb_pull(skb, tcph->doff << 2);
1732         inc_sequence = ntohl(tcph->seq);
1733         datasize = skb->len;
1734         switch (cm_node->state) {
1735         case NES_CM_STATE_SYN_RCVD:
1736                 /* Passive OPEN */
1737                 cleanup_retrans_entry(cm_node);
1738                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1739                 if (ret)
1740                         break;
1741                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1742                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1743                 if (datasize) {
1744                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1745                         handle_rcv_mpa(cm_node, skb);
1746                 } else  /* rcvd ACK only */
1747                         dev_kfree_skb_any(skb);
1748                 break;
1749         case NES_CM_STATE_ESTABLISHED:
1750                 /* Passive OPEN */
1751                 cleanup_retrans_entry(cm_node);
1752                 if (datasize) {
1753                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1754                         handle_rcv_mpa(cm_node, skb);
1755                 } else
1756                         drop_packet(skb);
1757                 break;
1758         case NES_CM_STATE_MPAREQ_SENT:
1759                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1760                 if (datasize) {
1761                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1762                         handle_rcv_mpa(cm_node, skb);
1763                 } else  /* Could be just an ack pkt.. */
1764                         dev_kfree_skb_any(skb);
1765                 break;
1766         case NES_CM_STATE_LISTENING:
1767                 cleanup_retrans_entry(cm_node);
1768                 cm_node->state = NES_CM_STATE_CLOSED;
1769                 send_reset(cm_node, skb);
1770                 break;
1771         case NES_CM_STATE_CLOSED:
1772                 cleanup_retrans_entry(cm_node);
1773                 add_ref_cm_node(cm_node);
1774                 send_reset(cm_node, skb);
1775                 break;
1776         case NES_CM_STATE_LAST_ACK:
1777         case NES_CM_STATE_CLOSING:
1778                 cleanup_retrans_entry(cm_node);
1779                 cm_node->state = NES_CM_STATE_CLOSED;
1780                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1781                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1782                 drop_packet(skb);
1783                 break;
1784         case NES_CM_STATE_FIN_WAIT1:
1785                 cleanup_retrans_entry(cm_node);
1786                 drop_packet(skb);
1787                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1788                 break;
1789         case NES_CM_STATE_SYN_SENT:
1790         case NES_CM_STATE_FIN_WAIT2:
1791         case NES_CM_STATE_TSA:
1792         case NES_CM_STATE_MPAREQ_RCVD:
1793         case NES_CM_STATE_UNKNOWN:
1794         default:
1795                 cleanup_retrans_entry(cm_node);
1796                 drop_packet(skb);
1797                 break;
1798         }
1799         return ret;
1800 }
1801
1802
1803
1804 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1805         struct sk_buff *skb, int optionsize, int passive)
1806 {
1807         u8 *optionsloc = (u8 *)&tcph[1];
1808         if (optionsize) {
1809                 if (process_options(cm_node, optionsloc, optionsize,
1810                         (u32)tcph->syn)) {
1811                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
1812                                 __func__, cm_node);
1813                         if (passive)
1814                                 passive_open_err(cm_node, skb, 1);
1815                         else
1816                                 active_open_err(cm_node, skb, 1);
1817                         return 1;
1818                 }
1819         }
1820
1821         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1822                         cm_node->tcp_cntxt.snd_wscale;
1823
1824         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1825                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1826         return 0;
1827 }
1828
1829 /*
1830  * active_open_err() will send reset() if flag set..
1831  * It will also send ABORT event.
1832  */
1833
1834 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1835         int reset)
1836 {
1837         cleanup_retrans_entry(cm_node);
1838         if (reset) {
1839                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
1840                                 "state=%d\n", cm_node, cm_node->state);
1841                 add_ref_cm_node(cm_node);
1842                 send_reset(cm_node, skb);
1843         } else
1844                 dev_kfree_skb_any(skb);
1845
1846         cm_node->state = NES_CM_STATE_CLOSED;
1847         create_event(cm_node, NES_CM_EVENT_ABORTED);
1848 }
1849
1850 /*
1851  * passive_open_err() will either do a reset() or will free up the skb and
1852  * remove the cm_node.
1853  */
1854
1855 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1856         int reset)
1857 {
1858         cleanup_retrans_entry(cm_node);
1859         cm_node->state = NES_CM_STATE_CLOSED;
1860         if (reset) {
1861                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
1862                         "cm_node=%p state =%d\n", cm_node, cm_node->state);
1863                 send_reset(cm_node, skb);
1864         } else {
1865                 dev_kfree_skb_any(skb);
1866                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1867         }
1868 }
1869
1870 /*
1871  * free_retrans_entry() routines assumes that the retrans_list_lock has
1872  * been acquired before calling.
1873  */
1874 static void free_retrans_entry(struct nes_cm_node *cm_node)
1875 {
1876         struct nes_timer_entry *send_entry;
1877         send_entry = cm_node->send_entry;
1878         if (send_entry) {
1879                 cm_node->send_entry = NULL;
1880                 dev_kfree_skb_any(send_entry->skb);
1881                 kfree(send_entry);
1882                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1883         }
1884 }
1885
1886 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
1887 {
1888         unsigned long flags;
1889
1890         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1891         free_retrans_entry(cm_node);
1892         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1893 }
1894
1895 /**
1896  * process_packet
1897  * Returns skb if to be freed, else it will return NULL if already used..
1898  */
1899 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1900         struct nes_cm_core *cm_core)
1901 {
1902         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
1903         struct tcphdr *tcph = tcp_hdr(skb);
1904         u32     fin_set = 0;
1905         int ret = 0;
1906         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1907
1908         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1909                 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1910                 tcph->ack, tcph->rst, tcph->fin);
1911
1912         if (tcph->rst)
1913                 pkt_type = NES_PKT_TYPE_RST;
1914         else if (tcph->syn) {
1915                 pkt_type = NES_PKT_TYPE_SYN;
1916                 if (tcph->ack)
1917                         pkt_type = NES_PKT_TYPE_SYNACK;
1918         } else if (tcph->ack)
1919                 pkt_type = NES_PKT_TYPE_ACK;
1920         if (tcph->fin)
1921                 fin_set = 1;
1922
1923         switch (pkt_type) {
1924         case NES_PKT_TYPE_SYN:
1925                 handle_syn_pkt(cm_node, skb, tcph);
1926                 break;
1927         case NES_PKT_TYPE_SYNACK:
1928                 handle_synack_pkt(cm_node, skb, tcph);
1929                 break;
1930         case NES_PKT_TYPE_ACK:
1931                 ret = handle_ack_pkt(cm_node, skb, tcph);
1932                 if (fin_set && !ret)
1933                         handle_fin_pkt(cm_node);
1934                 break;
1935         case NES_PKT_TYPE_RST:
1936                 handle_rst_pkt(cm_node, skb, tcph);
1937                 break;
1938         default:
1939                 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
1940                         handle_fin_pkt(cm_node);
1941                 drop_packet(skb);
1942                 break;
1943         }
1944 }
1945
1946 /**
1947  * mini_cm_listen - create a listen node with params
1948  */
1949 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1950         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1951 {
1952         struct nes_cm_listener *listener;
1953         unsigned long flags;
1954
1955         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1956                 cm_info->loc_addr, cm_info->loc_port);
1957
1958         /* cannot have multiple matching listeners */
1959         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1960                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1961         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1962                 /* find automatically incs ref count ??? */
1963                 atomic_dec(&listener->ref_count);
1964                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1965                 return NULL;
1966         }
1967
1968         if (!listener) {
1969                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1970                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1971                 if (!listener) {
1972                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1973                         return NULL;
1974                 }
1975
1976                 listener->loc_addr = htonl(cm_info->loc_addr);
1977                 listener->loc_port = htons(cm_info->loc_port);
1978                 listener->reused_node = 0;
1979
1980                 atomic_set(&listener->ref_count, 1);
1981         }
1982         /* pasive case */
1983         /* find already inc'ed the ref count */
1984         else {
1985                 listener->reused_node = 1;
1986         }
1987
1988         listener->cm_id = cm_info->cm_id;
1989         atomic_set(&listener->pend_accepts_cnt, 0);
1990         listener->cm_core = cm_core;
1991         listener->nesvnic = nesvnic;
1992         atomic_inc(&cm_core->node_cnt);
1993
1994         listener->conn_type = cm_info->conn_type;
1995         listener->backlog = cm_info->backlog;
1996         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1997
1998         if (!listener->reused_node) {
1999                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2000                 list_add(&listener->list, &cm_core->listen_list.list);
2001                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2002                 atomic_inc(&cm_core->listen_node_cnt);
2003         }
2004
2005         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
2006                         " listener = %p, backlog = %d, cm_id = %p.\n",
2007                         cm_info->loc_addr, cm_info->loc_port,
2008                         listener, listener->backlog, listener->cm_id);
2009
2010         return listener;
2011 }
2012
2013
2014 /**
2015  * mini_cm_connect - make a connection node with params
2016  */
2017 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2018         struct nes_vnic *nesvnic, u16 private_data_len,
2019         void *private_data, struct nes_cm_info *cm_info)
2020 {
2021         int ret = 0;
2022         struct nes_cm_node *cm_node;
2023         struct nes_cm_listener *loopbackremotelistener;
2024         struct nes_cm_node *loopbackremotenode;
2025         struct nes_cm_info loopback_cm_info;
2026         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
2027         struct ietf_mpa_frame *mpa_frame = NULL;
2028
2029         /* create a CM connection node */
2030         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2031         if (!cm_node)
2032                 return NULL;
2033         mpa_frame = &cm_node->mpa_frame;
2034         memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
2035         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
2036         mpa_frame->rev =  IETF_MPA_VERSION;
2037         mpa_frame->priv_data_len = htons(private_data_len);
2038
2039         /* set our node side to client (active) side */
2040         cm_node->tcp_cntxt.client = 1;
2041         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2042
2043         if (cm_info->loc_addr == cm_info->rem_addr) {
2044                 loopbackremotelistener = find_listener(cm_core,
2045                                 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
2046                                 NES_CM_LISTENER_ACTIVE_STATE);
2047                 if (loopbackremotelistener == NULL) {
2048                         create_event(cm_node, NES_CM_EVENT_ABORTED);
2049                 } else {
2050                         loopback_cm_info = *cm_info;
2051                         loopback_cm_info.loc_port = cm_info->rem_port;
2052                         loopback_cm_info.rem_port = cm_info->loc_port;
2053                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2054                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
2055                                 &loopback_cm_info, loopbackremotelistener);
2056                         if (!loopbackremotenode) {
2057                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2058                                 return NULL;
2059                         }
2060                         atomic_inc(&cm_loopbacks);
2061                         loopbackremotenode->loopbackpartner = cm_node;
2062                         loopbackremotenode->tcp_cntxt.rcv_wscale =
2063                                 NES_CM_DEFAULT_RCV_WND_SCALE;
2064                         cm_node->loopbackpartner = loopbackremotenode;
2065                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2066                                 private_data_len);
2067                         loopbackremotenode->mpa_frame_size = private_data_len;
2068
2069                         /* we are done handling this state. */
2070                         /* set node to a TSA state */
2071                         cm_node->state = NES_CM_STATE_TSA;
2072                         cm_node->tcp_cntxt.rcv_nxt =
2073                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
2074                         loopbackremotenode->tcp_cntxt.rcv_nxt =
2075                                 cm_node->tcp_cntxt.loc_seq_num;
2076                         cm_node->tcp_cntxt.max_snd_wnd =
2077                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2078                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
2079                                 cm_node->tcp_cntxt.rcv_wnd;
2080                         cm_node->tcp_cntxt.snd_wnd =
2081                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2082                         loopbackremotenode->tcp_cntxt.snd_wnd =
2083                                 cm_node->tcp_cntxt.rcv_wnd;
2084                         cm_node->tcp_cntxt.snd_wscale =
2085                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
2086                         loopbackremotenode->tcp_cntxt.snd_wscale =
2087                                 cm_node->tcp_cntxt.rcv_wscale;
2088                         loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2089                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2090                 }
2091                 return cm_node;
2092         }
2093
2094         /* set our node side to client (active) side */
2095         cm_node->tcp_cntxt.client = 1;
2096         /* init our MPA frame ptr */
2097         memcpy(mpa_frame->priv_data, private_data, private_data_len);
2098
2099         cm_node->mpa_frame_size = mpa_frame_size;
2100
2101         /* send a syn and goto syn sent state */
2102         cm_node->state = NES_CM_STATE_SYN_SENT;
2103         ret = send_syn(cm_node, 0, NULL);
2104
2105         if (ret) {
2106                 /* error in sending the syn free up the cm_node struct */
2107                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2108                         "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2109                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2110                         cm_node->cm_id);
2111                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2112                 cm_node = NULL;
2113         }
2114
2115         if (cm_node)
2116                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2117                         "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2118                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2119                         cm_node->cm_id);
2120
2121         return cm_node;
2122 }
2123
2124
2125 /**
2126  * mini_cm_accept - accept a connection
2127  * This function is never called
2128  */
2129 static int mini_cm_accept(struct nes_cm_core *cm_core,
2130         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2131 {
2132         return 0;
2133 }
2134
2135
2136 /**
2137  * mini_cm_reject - reject and teardown a connection
2138  */
2139 static int mini_cm_reject(struct nes_cm_core *cm_core,
2140         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2141 {
2142         int ret = 0;
2143         int err = 0;
2144         int passive_state;
2145         struct nes_cm_event event;
2146         struct iw_cm_id *cm_id = cm_node->cm_id;
2147         struct nes_cm_node *loopback = cm_node->loopbackpartner;
2148
2149         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2150                 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2151
2152         if (cm_node->tcp_cntxt.client)
2153                 return ret;
2154         cleanup_retrans_entry(cm_node);
2155
2156         if (!loopback) {
2157                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2158                 if (passive_state == NES_SEND_RESET_EVENT) {
2159                         cm_node->state = NES_CM_STATE_CLOSED;
2160                         rem_ref_cm_node(cm_core, cm_node);
2161                 } else {
2162                         if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2163                                 rem_ref_cm_node(cm_core, cm_node);
2164                         } else {
2165                                 ret = send_mpa_reject(cm_node);
2166                                 if (ret) {
2167                                         cm_node->state = NES_CM_STATE_CLOSED;
2168                                         err = send_reset(cm_node, NULL);
2169                                         if (err)
2170                                                 WARN_ON(1);
2171                                 } else
2172                                         cm_id->add_ref(cm_id);
2173                         }
2174                 }
2175         } else {
2176                 cm_node->cm_id = NULL;
2177                 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2178                         rem_ref_cm_node(cm_core, cm_node);
2179                         rem_ref_cm_node(cm_core, loopback);
2180                 } else {
2181                         event.cm_node = loopback;
2182                         event.cm_info.rem_addr = loopback->rem_addr;
2183                         event.cm_info.loc_addr = loopback->loc_addr;
2184                         event.cm_info.rem_port = loopback->rem_port;
2185                         event.cm_info.loc_port = loopback->loc_port;
2186                         event.cm_info.cm_id = loopback->cm_id;
2187                         cm_event_mpa_reject(&event);
2188                         rem_ref_cm_node(cm_core, cm_node);
2189                         loopback->state = NES_CM_STATE_CLOSING;
2190
2191                         cm_id = loopback->cm_id;
2192                         rem_ref_cm_node(cm_core, loopback);
2193                         cm_id->rem_ref(cm_id);
2194                 }
2195         }
2196
2197         return ret;
2198 }
2199
2200
2201 /**
2202  * mini_cm_close
2203  */
2204 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2205 {
2206         int ret = 0;
2207
2208         if (!cm_core || !cm_node)
2209                 return -EINVAL;
2210
2211         switch (cm_node->state) {
2212         case NES_CM_STATE_SYN_RCVD:
2213         case NES_CM_STATE_SYN_SENT:
2214         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2215         case NES_CM_STATE_ESTABLISHED:
2216         case NES_CM_STATE_ACCEPTING:
2217         case NES_CM_STATE_MPAREQ_SENT:
2218         case NES_CM_STATE_MPAREQ_RCVD:
2219                 cleanup_retrans_entry(cm_node);
2220                 send_reset(cm_node, NULL);
2221                 break;
2222         case NES_CM_STATE_CLOSE_WAIT:
2223                 cm_node->state = NES_CM_STATE_LAST_ACK;
2224                 send_fin(cm_node, NULL);
2225                 break;
2226         case NES_CM_STATE_FIN_WAIT1:
2227         case NES_CM_STATE_FIN_WAIT2:
2228         case NES_CM_STATE_LAST_ACK:
2229         case NES_CM_STATE_TIME_WAIT:
2230         case NES_CM_STATE_CLOSING:
2231                 ret = -1;
2232                 break;
2233         case NES_CM_STATE_LISTENING:
2234                 cleanup_retrans_entry(cm_node);
2235                 send_reset(cm_node, NULL);
2236                 break;
2237         case NES_CM_STATE_MPAREJ_RCVD:
2238         case NES_CM_STATE_UNKNOWN:
2239         case NES_CM_STATE_INITED:
2240         case NES_CM_STATE_CLOSED:
2241         case NES_CM_STATE_LISTENER_DESTROYED:
2242                 ret = rem_ref_cm_node(cm_core, cm_node);
2243                 break;
2244         case NES_CM_STATE_TSA:
2245                 if (cm_node->send_entry)
2246                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2247                                 "send_entry=%p\n", cm_node->send_entry);
2248                 ret = rem_ref_cm_node(cm_core, cm_node);
2249                 break;
2250         }
2251         return ret;
2252 }
2253
2254
2255 /**
2256  * recv_pkt - recv an ETHERNET packet, and process it through CM
2257  * node state machine
2258  */
2259 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2260         struct nes_vnic *nesvnic, struct sk_buff *skb)
2261 {
2262         struct nes_cm_node *cm_node = NULL;
2263         struct nes_cm_listener *listener = NULL;
2264         struct iphdr *iph;
2265         struct tcphdr *tcph;
2266         struct nes_cm_info nfo;
2267         int skb_handled = 1;
2268         __be32 tmp_daddr, tmp_saddr;
2269
2270         if (!skb)
2271                 return 0;
2272         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2273                 return 0;
2274         }
2275
2276         iph = (struct iphdr *)skb->data;
2277         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2278
2279         nfo.loc_addr = ntohl(iph->daddr);
2280         nfo.loc_port = ntohs(tcph->dest);
2281         nfo.rem_addr = ntohl(iph->saddr);
2282         nfo.rem_port = ntohs(tcph->source);
2283
2284         tmp_daddr = cpu_to_be32(iph->daddr);
2285         tmp_saddr = cpu_to_be32(iph->saddr);
2286
2287         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2288                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2289
2290         do {
2291                 cm_node = find_node(cm_core,
2292                         nfo.rem_port, nfo.rem_addr,
2293                         nfo.loc_port, nfo.loc_addr);
2294
2295                 if (!cm_node) {
2296                         /* Only type of packet accepted are for */
2297                         /* the PASSIVE open (syn only) */
2298                         if ((!tcph->syn) || (tcph->ack)) {
2299                                 skb_handled = 0;
2300                                 break;
2301                         }
2302                         listener = find_listener(cm_core, nfo.loc_addr,
2303                                 nfo.loc_port,
2304                                 NES_CM_LISTENER_ACTIVE_STATE);
2305                         if (!listener) {
2306                                 nfo.cm_id = NULL;
2307                                 nfo.conn_type = 0;
2308                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2309                                 skb_handled = 0;
2310                                 break;
2311                         }
2312                         nfo.cm_id = listener->cm_id;
2313                         nfo.conn_type = listener->conn_type;
2314                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2315                                 listener);
2316                         if (!cm_node) {
2317                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2318                                         "node\n");
2319                                 cm_packets_dropped++;
2320                                 atomic_dec(&listener->ref_count);
2321                                 dev_kfree_skb_any(skb);
2322                                 break;
2323                         }
2324                         if (!tcph->rst && !tcph->fin) {
2325                                 cm_node->state = NES_CM_STATE_LISTENING;
2326                         } else {
2327                                 cm_packets_dropped++;
2328                                 rem_ref_cm_node(cm_core, cm_node);
2329                                 dev_kfree_skb_any(skb);
2330                                 break;
2331                         }
2332                         add_ref_cm_node(cm_node);
2333                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2334                         rem_ref_cm_node(cm_core, cm_node);
2335                         atomic_inc(&cm_accel_dropped_pkts);
2336                         dev_kfree_skb_any(skb);
2337                         break;
2338                 }
2339                 skb_reset_network_header(skb);
2340                 skb_set_transport_header(skb, sizeof(*tcph));
2341                 skb->len = ntohs(iph->tot_len);
2342                 process_packet(cm_node, skb, cm_core);
2343                 rem_ref_cm_node(cm_core, cm_node);
2344         } while (0);
2345         return skb_handled;
2346 }
2347
2348
2349 /**
2350  * nes_cm_alloc_core - allocate a top level instance of a cm core
2351  */
2352 static struct nes_cm_core *nes_cm_alloc_core(void)
2353 {
2354         struct nes_cm_core *cm_core;
2355
2356         /* setup the CM core */
2357         /* alloc top level core control structure */
2358         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2359         if (!cm_core)
2360                 return NULL;
2361
2362         INIT_LIST_HEAD(&cm_core->connected_nodes);
2363         init_timer(&cm_core->tcp_timer);
2364         cm_core->tcp_timer.function = nes_cm_timer_tick;
2365
2366         cm_core->mtu   = NES_CM_DEFAULT_MTU;
2367         cm_core->state = NES_CM_STATE_INITED;
2368         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2369
2370         atomic_set(&cm_core->events_posted, 0);
2371
2372         cm_core->api = &nes_cm_api;
2373
2374         spin_lock_init(&cm_core->ht_lock);
2375         spin_lock_init(&cm_core->listen_list_lock);
2376
2377         INIT_LIST_HEAD(&cm_core->listen_list.list);
2378
2379         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2380
2381         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2382         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2383         cm_core->post_event = nes_cm_post_event;
2384         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2385         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2386
2387         print_core(cm_core);
2388         return cm_core;
2389 }
2390
2391
2392 /**
2393  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2394  */
2395 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2396 {
2397         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2398
2399         if (!cm_core)
2400                 return -EINVAL;
2401
2402         barrier();
2403
2404         if (timer_pending(&cm_core->tcp_timer)) {
2405                 del_timer(&cm_core->tcp_timer);
2406         }
2407
2408         destroy_workqueue(cm_core->event_wq);
2409         destroy_workqueue(cm_core->disconn_wq);
2410         nes_debug(NES_DBG_CM, "\n");
2411         kfree(cm_core);
2412
2413         return 0;
2414 }
2415
2416
2417 /**
2418  * mini_cm_get
2419  */
2420 static int mini_cm_get(struct nes_cm_core *cm_core)
2421 {
2422         return cm_core->state;
2423 }
2424
2425
2426 /**
2427  * mini_cm_set
2428  */
2429 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2430 {
2431         int ret = 0;
2432
2433         switch (type) {
2434         case NES_CM_SET_PKT_SIZE:
2435                 cm_core->mtu = value;
2436                 break;
2437         case NES_CM_SET_FREE_PKT_Q_SIZE:
2438                 cm_core->free_tx_pkt_max = value;
2439                 break;
2440         default:
2441                 /* unknown set option */
2442                 ret = -EINVAL;
2443         }
2444
2445         return ret;
2446 }
2447
2448
2449 /**
2450  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2451  * successfully exchanged when this is called
2452  */
2453 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2454 {
2455         int ret = 0;
2456
2457         if (!nesqp)
2458                 return -EINVAL;
2459
2460         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2461                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2462                         NES_QPCONTEXT_MISC_DROS);
2463
2464         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2465                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2466
2467         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2468
2469         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2470
2471         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2472                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2473
2474         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2475                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2476                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2477
2478         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2479                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2480                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2481
2482         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2483         nesqp->nesqp_context->ts_recent = 0;
2484         nesqp->nesqp_context->ts_age = 0;
2485         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2486         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2487         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2488         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2489                         cm_node->tcp_cntxt.rcv_wscale);
2490         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2491         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2492         nesqp->nesqp_context->srtt = 0;
2493         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2494         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2495         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2496         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2497         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2498         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2499
2500         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2501                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2502                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2503                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2504                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2505                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2506                         le32_to_cpu(nesqp->nesqp_context->misc));
2507         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2508         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2509         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2510
2511         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2512         cm_node->state = NES_CM_STATE_TSA;
2513
2514         return ret;
2515 }
2516
2517
2518 /**
2519  * nes_cm_disconn
2520  */
2521 int nes_cm_disconn(struct nes_qp *nesqp)
2522 {
2523         struct disconn_work *work;
2524
2525         work = kzalloc(sizeof *work, GFP_ATOMIC);
2526         if (!work)
2527                 return -ENOMEM; /* Timer will clean up */
2528
2529         nes_add_ref(&nesqp->ibqp);
2530         work->nesqp = nesqp;
2531         INIT_WORK(&work->work, nes_disconnect_worker);
2532         queue_work(g_cm_core->disconn_wq, &work->work);
2533         return 0;
2534 }
2535
2536
2537 /**
2538  * nes_disconnect_worker
2539  */
2540 static void nes_disconnect_worker(struct work_struct *work)
2541 {
2542         struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2543         struct nes_qp *nesqp = dwork->nesqp;
2544
2545         kfree(dwork);
2546         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2547                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2548         nes_cm_disconn_true(nesqp);
2549         nes_rem_ref(&nesqp->ibqp);
2550 }
2551
2552
2553 /**
2554  * nes_cm_disconn_true
2555  */
2556 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2557 {
2558         unsigned long flags;
2559         int ret = 0;
2560         struct iw_cm_id *cm_id;
2561         struct iw_cm_event cm_event;
2562         struct nes_vnic *nesvnic;
2563         u16 last_ae;
2564         u8 original_hw_tcp_state;
2565         u8 original_ibqp_state;
2566         int disconn_status = 0;
2567         int issue_disconn = 0;
2568         int issue_close = 0;
2569         int issue_flush = 0;
2570         u32 flush_q = NES_CQP_FLUSH_RQ;
2571         struct ib_event ibevent;
2572
2573         if (!nesqp) {
2574                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2575                 return -1;
2576         }
2577
2578         spin_lock_irqsave(&nesqp->lock, flags);
2579         cm_id = nesqp->cm_id;
2580         /* make sure we havent already closed this connection */
2581         if (!cm_id) {
2582                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2583                                 nesqp->hwqp.qp_id);
2584                 spin_unlock_irqrestore(&nesqp->lock, flags);
2585                 return -1;
2586         }
2587
2588         nesvnic = to_nesvnic(nesqp->ibqp.device);
2589         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2590
2591         original_hw_tcp_state = nesqp->hw_tcp_state;
2592         original_ibqp_state   = nesqp->ibqp_state;
2593         last_ae = nesqp->last_aeq;
2594
2595         if (nesqp->term_flags) {
2596                 issue_disconn = 1;
2597                 issue_close = 1;
2598                 nesqp->cm_id = NULL;
2599                 if (nesqp->flush_issued == 0) {
2600                         nesqp->flush_issued = 1;
2601                         issue_flush = 1;
2602                 }
2603         } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2604                         ((original_ibqp_state == IB_QPS_RTS) &&
2605                         (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2606                 issue_disconn = 1;
2607                 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2608                         disconn_status = -ECONNRESET;
2609         }
2610
2611         if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2612                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2613                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2614                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2615                 issue_close = 1;
2616                 nesqp->cm_id = NULL;
2617                 if (nesqp->flush_issued == 0) {
2618                         nesqp->flush_issued = 1;
2619                         issue_flush = 1;
2620                 }
2621         }
2622
2623         spin_unlock_irqrestore(&nesqp->lock, flags);
2624
2625         if ((issue_flush) && (nesqp->destroyed == 0)) {
2626                 /* Flush the queue(s) */
2627                 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2628                         flush_q |= NES_CQP_FLUSH_SQ;
2629                 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2630
2631                 if (nesqp->term_flags) {
2632                         ibevent.device = nesqp->ibqp.device;
2633                         ibevent.event = nesqp->terminate_eventtype;
2634                         ibevent.element.qp = &nesqp->ibqp;
2635                         nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2636                 }
2637         }
2638
2639         if ((cm_id) && (cm_id->event_handler)) {
2640                 if (issue_disconn) {
2641                         atomic_inc(&cm_disconnects);
2642                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2643                         cm_event.status = disconn_status;
2644                         cm_event.local_addr = cm_id->local_addr;
2645                         cm_event.remote_addr = cm_id->remote_addr;
2646                         cm_event.private_data = NULL;
2647                         cm_event.private_data_len = 0;
2648
2649                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2650                                 " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2651                                 "cm_id = %p, refcount = %u.\n",
2652                                 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2653                                 nesqp->hwqp.sq_tail, cm_id,
2654                                 atomic_read(&nesqp->refcount));
2655
2656                         ret = cm_id->event_handler(cm_id, &cm_event);
2657                         if (ret)
2658                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2659                                         "returned, ret=%d\n", ret);
2660                 }
2661
2662                 if (issue_close) {
2663                         atomic_inc(&cm_closes);
2664                         nes_disconnect(nesqp, 1);
2665
2666                         cm_id->provider_data = nesqp;
2667                         /* Send up the close complete event */
2668                         cm_event.event = IW_CM_EVENT_CLOSE;
2669                         cm_event.status = 0;
2670                         cm_event.provider_data = cm_id->provider_data;
2671                         cm_event.local_addr = cm_id->local_addr;
2672                         cm_event.remote_addr = cm_id->remote_addr;
2673                         cm_event.private_data = NULL;
2674                         cm_event.private_data_len = 0;
2675
2676                         ret = cm_id->event_handler(cm_id, &cm_event);
2677                         if (ret) {
2678                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2679                         }
2680
2681                         cm_id->rem_ref(cm_id);
2682                 }
2683         }
2684
2685         return 0;
2686 }
2687
2688
2689 /**
2690  * nes_disconnect
2691  */
2692 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2693 {
2694         int ret = 0;
2695         struct nes_vnic *nesvnic;
2696         struct nes_device *nesdev;
2697         struct nes_ib_device *nesibdev;
2698
2699         nesvnic = to_nesvnic(nesqp->ibqp.device);
2700         if (!nesvnic)
2701                 return -EINVAL;
2702
2703         nesdev = nesvnic->nesdev;
2704         nesibdev = nesvnic->nesibdev;
2705
2706         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2707                         netdev_refcnt_read(nesvnic->netdev));
2708
2709         if (nesqp->active_conn) {
2710
2711                 /* indicate this connection is NOT active */
2712                 nesqp->active_conn = 0;
2713         } else {
2714                 /* Need to free the Last Streaming Mode Message */
2715                 if (nesqp->ietf_frame) {
2716                         if (nesqp->lsmm_mr)
2717                                 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2718                         pci_free_consistent(nesdev->pcidev,
2719                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2720                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2721                 }
2722         }
2723
2724         /* close the CM node down if it is still active */
2725         if (nesqp->cm_node) {
2726                 nes_debug(NES_DBG_CM, "Call close API\n");
2727
2728                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2729         }
2730
2731         return ret;
2732 }
2733
2734
2735 /**
2736  * nes_accept
2737  */
2738 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2739 {
2740         u64 u64temp;
2741         struct ib_qp *ibqp;
2742         struct nes_qp *nesqp;
2743         struct nes_vnic *nesvnic;
2744         struct nes_device *nesdev;
2745         struct nes_cm_node *cm_node;
2746         struct nes_adapter *adapter;
2747         struct ib_qp_attr attr;
2748         struct iw_cm_event cm_event;
2749         struct nes_hw_qp_wqe *wqe;
2750         struct nes_v4_quad nes_quad;
2751         u32 crc_value;
2752         int ret;
2753         int passive_state;
2754         struct nes_ib_device *nesibdev;
2755         struct ib_mr *ibmr = NULL;
2756         struct ib_phys_buf ibphysbuf;
2757         struct nes_pd *nespd;
2758         u64 tagged_offset;
2759
2760         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2761         if (!ibqp)
2762                 return -EINVAL;
2763
2764         /* get all our handles */
2765         nesqp = to_nesqp(ibqp);
2766         nesvnic = to_nesvnic(nesqp->ibqp.device);
2767         nesdev = nesvnic->nesdev;
2768         adapter = nesdev->nesadapter;
2769
2770         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2771         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2772                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2773                 nesvnic->netdev->name);
2774
2775         if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
2776                 if (cm_node->loopbackpartner)
2777                         rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
2778                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2779                 return -EINVAL;
2780         }
2781
2782         passive_state = atomic_add_return(1, &cm_node->passive_state);
2783         if (passive_state == NES_SEND_RESET_EVENT) {
2784                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2785                 return -ECONNRESET;
2786         }
2787
2788         /* associate the node with the QP */
2789         nesqp->cm_node = (void *)cm_node;
2790         cm_node->nesqp = nesqp;
2791
2792         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
2793                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2794         atomic_inc(&cm_accepts);
2795
2796         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2797                         netdev_refcnt_read(nesvnic->netdev));
2798
2799         /* allocate the ietf frame and space for private data */
2800         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2801                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2802                 &nesqp->ietf_frame_pbase);
2803
2804         if (!nesqp->ietf_frame) {
2805                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
2806                         "data\n");
2807                 return -ENOMEM;
2808         }
2809
2810
2811         /* setup the MPA frame */
2812         nesqp->private_data_len = conn_param->private_data_len;
2813         memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2814
2815         memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2816                         conn_param->private_data_len);
2817
2818         nesqp->ietf_frame->priv_data_len =
2819                 cpu_to_be16(conn_param->private_data_len);
2820         nesqp->ietf_frame->rev = mpa_version;
2821         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2822
2823         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2824         wqe = &nesqp->hwqp.sq_vbase[0];
2825
2826         if (cm_id->remote_addr.sin_addr.s_addr !=
2827                         cm_id->local_addr.sin_addr.s_addr) {
2828                 u64temp = (unsigned long)nesqp;
2829                 nesibdev = nesvnic->nesibdev;
2830                 nespd = nesqp->nespd;
2831                 ibphysbuf.addr = nesqp->ietf_frame_pbase;
2832                 ibphysbuf.size = conn_param->private_data_len +
2833                                         sizeof(struct ietf_mpa_frame);
2834                 tagged_offset = (u64)(unsigned long)nesqp->ietf_frame;
2835                 ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
2836                                                 &ibphysbuf, 1,
2837                                                 IB_ACCESS_LOCAL_WRITE,
2838                                                 &tagged_offset);
2839                 if (!ibmr) {
2840                         nes_debug(NES_DBG_CM, "Unable to register memory region"
2841                                         "for lSMM for cm_node = %p \n",
2842                                         cm_node);
2843                         pci_free_consistent(nesdev->pcidev,
2844                                 nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2845                                 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2846                         return -ENOMEM;
2847                 }
2848
2849                 ibmr->pd = &nespd->ibpd;
2850                 ibmr->device = nespd->ibpd.device;
2851                 nesqp->lsmm_mr = ibmr;
2852
2853                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2854                 set_wqe_64bit_value(wqe->wqe_words,
2855                         NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2856                         u64temp);
2857                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2858                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2859                         NES_IWARP_SQ_WQE_WRPDU);
2860                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2861                         cpu_to_le32(conn_param->private_data_len +
2862                         sizeof(struct ietf_mpa_frame));
2863                 set_wqe_64bit_value(wqe->wqe_words,
2864                                         NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
2865                                         (u64)(unsigned long)nesqp->ietf_frame);
2866                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2867                         cpu_to_le32(conn_param->private_data_len +
2868                         sizeof(struct ietf_mpa_frame));
2869                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
2870                 if (nesqp->sq_kmapped) {
2871                         nesqp->sq_kmapped = 0;
2872                         kunmap(nesqp->page);
2873                 }
2874
2875                 nesqp->nesqp_context->ird_ord_sizes |=
2876                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2877                         NES_QPCONTEXT_ORDIRD_WRPDU);
2878         } else {
2879                 nesqp->nesqp_context->ird_ord_sizes |=
2880                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
2881         }
2882         nesqp->skip_lsmm = 1;
2883
2884
2885         /* Cache the cm_id in the qp */
2886         nesqp->cm_id = cm_id;
2887         cm_node->cm_id = cm_id;
2888
2889         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2890         cm_id->provider_data = nesqp;
2891         nesqp->active_conn   = 0;
2892
2893         if (cm_node->state == NES_CM_STATE_TSA)
2894                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2895                         cm_node);
2896
2897         nes_cm_init_tsa_conn(nesqp, cm_node);
2898
2899         nesqp->nesqp_context->tcpPorts[0] =
2900                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2901         nesqp->nesqp_context->tcpPorts[1] =
2902                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2903
2904         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2905                 nesqp->nesqp_context->ip0 =
2906                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2907         else
2908                 nesqp->nesqp_context->ip0 =
2909                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2910
2911         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2912                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2913                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2914
2915         nesqp->nesqp_context->arp_index_vlan |=
2916                 cpu_to_le32(nes_arp_table(nesdev,
2917                         le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2918                         NES_ARP_RESOLVE) << 16);
2919
2920         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2921                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2922
2923         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2924
2925         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2926                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2927         nesqp->nesqp_context->ird_ord_sizes |=
2928                 cpu_to_le32((u32)conn_param->ord);
2929
2930         memset(&nes_quad, 0, sizeof(nes_quad));
2931         nes_quad.DstIpAdrIndex =
2932                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2933         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2934                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2935         else
2936                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2937         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2938         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2939
2940         /* Produce hash key */
2941         crc_value = get_crc_value(&nes_quad);
2942         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2943         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2944                 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2945
2946         nesqp->hte_index &= adapter->hte_index_mask;
2947         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2948
2949         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2950
2951         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2952                         "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2953                         "private data length=%zu.\n", nesqp->hwqp.qp_id,
2954                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2955                         ntohs(cm_id->remote_addr.sin_port),
2956                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2957                         ntohs(cm_id->local_addr.sin_port),
2958                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2959                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2960                         conn_param->private_data_len +
2961                         sizeof(struct ietf_mpa_frame));
2962
2963
2964         /* notify OF layer that accept event was successful */
2965         cm_id->add_ref(cm_id);
2966         nes_add_ref(&nesqp->ibqp);
2967
2968         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2969         cm_event.status = 0;
2970         cm_event.provider_data = (void *)nesqp;
2971         cm_event.local_addr = cm_id->local_addr;
2972         cm_event.remote_addr = cm_id->remote_addr;
2973         cm_event.private_data = NULL;
2974         cm_event.private_data_len = 0;
2975         ret = cm_id->event_handler(cm_id, &cm_event);
2976         attr.qp_state = IB_QPS_RTS;
2977         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2978         if (cm_node->loopbackpartner) {
2979                 cm_node->loopbackpartner->mpa_frame_size =
2980                         nesqp->private_data_len;
2981                 /* copy entire MPA frame to our cm_node's frame */
2982                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2983                         nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2984                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2985         }
2986         if (ret)
2987                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2988                         "ret=%d\n", __func__, __LINE__, ret);
2989
2990         return 0;
2991 }
2992
2993
2994 /**
2995  * nes_reject
2996  */
2997 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2998 {
2999         struct nes_cm_node *cm_node;
3000         struct nes_cm_node *loopback;
3001
3002         struct nes_cm_core *cm_core;
3003
3004         atomic_inc(&cm_rejects);
3005         cm_node = (struct nes_cm_node *) cm_id->provider_data;
3006         loopback = cm_node->loopbackpartner;
3007         cm_core = cm_node->cm_core;
3008         cm_node->cm_id = cm_id;
3009         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
3010
3011         if (cm_node->mpa_frame_size > MAX_CM_BUFFER)
3012                 return -EINVAL;
3013
3014         memcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
3015         if (loopback) {
3016                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3017                 loopback->mpa_frame.priv_data_len = pdata_len;
3018                 loopback->mpa_frame_size = sizeof(struct ietf_mpa_frame) +
3019                                 pdata_len;
3020         } else {
3021                 memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
3022                 cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
3023         }
3024
3025         cm_node->mpa_frame.rev = mpa_version;
3026         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
3027
3028         return cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
3029 }
3030
3031
3032 /**
3033  * nes_connect
3034  * setup and launch cm connect node
3035  */
3036 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3037 {
3038         struct ib_qp *ibqp;
3039         struct nes_qp *nesqp;
3040         struct nes_vnic *nesvnic;
3041         struct nes_device *nesdev;
3042         struct nes_cm_node *cm_node;
3043         struct nes_cm_info cm_info;
3044         int apbvt_set = 0;
3045
3046         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3047         if (!ibqp)
3048                 return -EINVAL;
3049         nesqp = to_nesqp(ibqp);
3050         if (!nesqp)
3051                 return -EINVAL;
3052         nesvnic = to_nesvnic(nesqp->ibqp.device);
3053         if (!nesvnic)
3054                 return -EINVAL;
3055         nesdev  = nesvnic->nesdev;
3056         if (!nesdev)
3057                 return -EINVAL;
3058
3059         if (!(cm_id->local_addr.sin_port) || !(cm_id->remote_addr.sin_port))
3060                 return -EINVAL;
3061
3062         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3063                 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3064                 ntohl(nesvnic->local_ipaddr),
3065                 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3066                 ntohs(cm_id->remote_addr.sin_port),
3067                 ntohl(cm_id->local_addr.sin_addr.s_addr),
3068                 ntohs(cm_id->local_addr.sin_port));
3069
3070         atomic_inc(&cm_connects);
3071         nesqp->active_conn = 1;
3072
3073         /* cache the cm_id in the qp */
3074         nesqp->cm_id = cm_id;
3075
3076         cm_id->provider_data = nesqp;
3077
3078         nesqp->private_data_len = conn_param->private_data_len;
3079         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
3080         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3081         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3082                 conn_param->private_data_len);
3083
3084         if (cm_id->local_addr.sin_addr.s_addr !=
3085                 cm_id->remote_addr.sin_addr.s_addr) {
3086                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3087                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3088                 apbvt_set = 1;
3089         }
3090
3091         /* set up the connection params for the node */
3092         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3093         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3094         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3095         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3096         cm_info.cm_id = cm_id;
3097         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3098
3099         cm_id->add_ref(cm_id);
3100
3101         /* create a connect CM node connection */
3102         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3103                 conn_param->private_data_len, (void *)conn_param->private_data,
3104                 &cm_info);
3105         if (!cm_node) {
3106                 if (apbvt_set)
3107                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3108                                 PCI_FUNC(nesdev->pcidev->devfn),
3109                                 NES_MANAGE_APBVT_DEL);
3110
3111                 cm_id->rem_ref(cm_id);
3112                 return -ENOMEM;
3113         }
3114
3115         cm_node->apbvt_set = apbvt_set;
3116         nesqp->cm_node = cm_node;
3117         cm_node->nesqp = nesqp;
3118         nes_add_ref(&nesqp->ibqp);
3119
3120         return 0;
3121 }
3122
3123
3124 /**
3125  * nes_create_listen
3126  */
3127 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3128 {
3129         struct nes_vnic *nesvnic;
3130         struct nes_cm_listener *cm_node;
3131         struct nes_cm_info cm_info;
3132         int err;
3133
3134         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3135                         cm_id, ntohs(cm_id->local_addr.sin_port));
3136
3137         nesvnic = to_nesvnic(cm_id->device);
3138         if (!nesvnic)
3139                 return -EINVAL;
3140
3141         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3142                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3143
3144         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3145                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3146
3147         /* setup listen params in our api call struct */
3148         cm_info.loc_addr = nesvnic->local_ipaddr;
3149         cm_info.loc_port = cm_id->local_addr.sin_port;
3150         cm_info.backlog = backlog;
3151         cm_info.cm_id = cm_id;
3152
3153         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3154
3155
3156         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3157         if (!cm_node) {
3158                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3159                                 __func__, __LINE__);
3160                 return -ENOMEM;
3161         }
3162
3163         cm_id->provider_data = cm_node;
3164
3165         if (!cm_node->reused_node) {
3166                 err = nes_manage_apbvt(nesvnic,
3167                         ntohs(cm_id->local_addr.sin_port),
3168                         PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3169                         NES_MANAGE_APBVT_ADD);
3170                 if (err) {
3171                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3172                                 err);
3173                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3174                         return err;
3175                 }
3176                 atomic_inc(&cm_listens_created);
3177         }
3178
3179         cm_id->add_ref(cm_id);
3180         cm_id->provider_data = (void *)cm_node;
3181
3182
3183         return 0;
3184 }
3185
3186
3187 /**
3188  * nes_destroy_listen
3189  */
3190 int nes_destroy_listen(struct iw_cm_id *cm_id)
3191 {
3192         if (cm_id->provider_data)
3193                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3194         else
3195                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3196
3197         cm_id->rem_ref(cm_id);
3198
3199         return 0;
3200 }
3201
3202
3203 /**
3204  * nes_cm_recv
3205  */
3206 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3207 {
3208         int rc = 0;
3209         cm_packets_received++;
3210         if ((g_cm_core) && (g_cm_core->api)) {
3211                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3212         } else {
3213                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3214                                 " cm is not setup properly.\n");
3215         }
3216
3217         return rc;
3218 }
3219
3220
3221 /**
3222  * nes_cm_start
3223  * Start and init a cm core module
3224  */
3225 int nes_cm_start(void)
3226 {
3227         nes_debug(NES_DBG_CM, "\n");
3228         /* create the primary CM core, pass this handle to subsequent core inits */
3229         g_cm_core = nes_cm_alloc_core();
3230         if (g_cm_core) {
3231                 return 0;
3232         } else {
3233                 return -ENOMEM;
3234         }
3235 }
3236
3237
3238 /**
3239  * nes_cm_stop
3240  * stop and dealloc all cm core instances
3241  */
3242 int nes_cm_stop(void)
3243 {
3244         g_cm_core->api->destroy_cm_core(g_cm_core);
3245         return 0;
3246 }
3247
3248
3249 /**
3250  * cm_event_connected
3251  * handle a connected event, setup QPs and HW
3252  */
3253 static void cm_event_connected(struct nes_cm_event *event)
3254 {
3255         u64 u64temp;
3256         struct nes_qp *nesqp;
3257         struct nes_vnic *nesvnic;
3258         struct nes_device *nesdev;
3259         struct nes_cm_node *cm_node;
3260         struct nes_adapter *nesadapter;
3261         struct ib_qp_attr attr;
3262         struct iw_cm_id *cm_id;
3263         struct iw_cm_event cm_event;
3264         struct nes_hw_qp_wqe *wqe;
3265         struct nes_v4_quad nes_quad;
3266         u32 crc_value;
3267         int ret;
3268
3269         /* get all our handles */
3270         cm_node = event->cm_node;
3271         cm_id = cm_node->cm_id;
3272         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3273         nesqp = (struct nes_qp *)cm_id->provider_data;
3274         nesvnic = to_nesvnic(nesqp->ibqp.device);
3275         nesdev = nesvnic->nesdev;
3276         nesadapter = nesdev->nesadapter;
3277
3278         if (nesqp->destroyed) {
3279                 return;
3280         }
3281         atomic_inc(&cm_connecteds);
3282         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3283                         " local port 0x%04X. jiffies = %lu.\n",
3284                         nesqp->hwqp.qp_id,
3285                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
3286                         ntohs(cm_id->remote_addr.sin_port),
3287                         ntohs(cm_id->local_addr.sin_port),
3288                         jiffies);
3289
3290         nes_cm_init_tsa_conn(nesqp, cm_node);
3291
3292         /* set the QP tsa context */
3293         nesqp->nesqp_context->tcpPorts[0] =
3294                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3295         nesqp->nesqp_context->tcpPorts[1] =
3296                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3297         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3298                 nesqp->nesqp_context->ip0 =
3299                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3300         else
3301                 nesqp->nesqp_context->ip0 =
3302                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3303
3304         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3305                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3306                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3307         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3308                         nes_arp_table(nesdev,
3309                         le32_to_cpu(nesqp->nesqp_context->ip0),
3310                         NULL, NES_ARP_RESOLVE) << 16);
3311         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3312                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3313         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3314         nesqp->nesqp_context->ird_ord_sizes |=
3315                         cpu_to_le32((u32)1 <<
3316                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3317
3318         /* Adjust tail for not having a LSMM */
3319         nesqp->hwqp.sq_tail = 1;
3320
3321 #if defined(NES_SEND_FIRST_WRITE)
3322         if (cm_node->send_write0) {
3323                 nes_debug(NES_DBG_CM, "Sending first write.\n");
3324                 wqe = &nesqp->hwqp.sq_vbase[0];
3325                 u64temp = (unsigned long)nesqp;
3326                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3327                 set_wqe_64bit_value(wqe->wqe_words,
3328                                 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3329                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3330                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3331                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3332                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3333                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3334                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3335                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3336
3337                 if (nesqp->sq_kmapped) {
3338                         nesqp->sq_kmapped = 0;
3339                         kunmap(nesqp->page);
3340                 }
3341
3342                 /* use the reserved spot on the WQ for the extra first WQE */
3343                 nesqp->nesqp_context->ird_ord_sizes &=
3344                         cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3345                                                 NES_QPCONTEXT_ORDIRD_WRPDU |
3346                                                 NES_QPCONTEXT_ORDIRD_ALSMM));
3347                 nesqp->skip_lsmm = 1;
3348                 nesqp->hwqp.sq_tail = 0;
3349                 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3350                                 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3351         }
3352 #endif
3353
3354         memset(&nes_quad, 0, sizeof(nes_quad));
3355
3356         nes_quad.DstIpAdrIndex =
3357                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3358         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3359                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3360         else
3361                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3362         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3363         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3364
3365         /* Produce hash key */
3366         crc_value = get_crc_value(&nes_quad);
3367         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3368         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3369                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3370
3371         nesqp->hte_index &= nesadapter->hte_index_mask;
3372         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3373
3374         nesqp->ietf_frame = &cm_node->mpa_frame;
3375         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3376         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3377
3378         /* notify OF layer we successfully created the requested connection */
3379         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3380         cm_event.status = 0;
3381         cm_event.provider_data = cm_id->provider_data;
3382         cm_event.local_addr.sin_family = AF_INET;
3383         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3384         cm_event.remote_addr = cm_id->remote_addr;
3385
3386         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3387         cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3388
3389         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3390         ret = cm_id->event_handler(cm_id, &cm_event);
3391         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3392
3393         if (ret)
3394                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3395                         "ret=%d\n", __func__, __LINE__, ret);
3396         attr.qp_state = IB_QPS_RTS;
3397         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3398
3399         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3400                 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3401
3402         return;
3403 }
3404
3405
3406 /**
3407  * cm_event_connect_error
3408  */
3409 static void cm_event_connect_error(struct nes_cm_event *event)
3410 {
3411         struct nes_qp *nesqp;
3412         struct iw_cm_id *cm_id;
3413         struct iw_cm_event cm_event;
3414         /* struct nes_cm_info cm_info; */
3415         int ret;
3416
3417         if (!event->cm_node)
3418                 return;
3419
3420         cm_id = event->cm_node->cm_id;
3421         if (!cm_id) {
3422                 return;
3423         }
3424
3425         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3426         nesqp = cm_id->provider_data;
3427
3428         if (!nesqp) {
3429                 return;
3430         }
3431
3432         /* notify OF layer about this connection error event */
3433         /* cm_id->rem_ref(cm_id); */
3434         nesqp->cm_id = NULL;
3435         cm_id->provider_data = NULL;
3436         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3437         cm_event.status = -ECONNRESET;
3438         cm_event.provider_data = cm_id->provider_data;
3439         cm_event.local_addr = cm_id->local_addr;
3440         cm_event.remote_addr = cm_id->remote_addr;
3441         cm_event.private_data = NULL;
3442         cm_event.private_data_len = 0;
3443
3444         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3445                 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3446                 cm_event.remote_addr.sin_addr.s_addr);
3447
3448         ret = cm_id->event_handler(cm_id, &cm_event);
3449         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3450         if (ret)
3451                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3452                         "ret=%d\n", __func__, __LINE__, ret);
3453         cm_id->rem_ref(cm_id);
3454
3455         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3456         return;
3457 }
3458
3459
3460 /**
3461  * cm_event_reset
3462  */
3463 static void cm_event_reset(struct nes_cm_event *event)
3464 {
3465         struct nes_qp *nesqp;
3466         struct iw_cm_id *cm_id;
3467         struct iw_cm_event cm_event;
3468         /* struct nes_cm_info cm_info; */
3469         int ret;
3470
3471         if (!event->cm_node)
3472                 return;
3473
3474         if (!event->cm_node->cm_id)
3475                 return;
3476
3477         cm_id = event->cm_node->cm_id;
3478
3479         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3480         nesqp = cm_id->provider_data;
3481         if (!nesqp)
3482                 return;
3483
3484         nesqp->cm_id = NULL;
3485         /* cm_id->provider_data = NULL; */
3486         cm_event.event = IW_CM_EVENT_DISCONNECT;
3487         cm_event.status = -ECONNRESET;
3488         cm_event.provider_data = cm_id->provider_data;
3489         cm_event.local_addr = cm_id->local_addr;
3490         cm_event.remote_addr = cm_id->remote_addr;
3491         cm_event.private_data = NULL;
3492         cm_event.private_data_len = 0;
3493
3494         cm_id->add_ref(cm_id);
3495         ret = cm_id->event_handler(cm_id, &cm_event);
3496         atomic_inc(&cm_closes);
3497         cm_event.event = IW_CM_EVENT_CLOSE;
3498         cm_event.status = 0;
3499         cm_event.provider_data = cm_id->provider_data;
3500         cm_event.local_addr = cm_id->local_addr;
3501         cm_event.remote_addr = cm_id->remote_addr;
3502         cm_event.private_data = NULL;
3503         cm_event.private_data_len = 0;
3504         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3505         ret = cm_id->event_handler(cm_id, &cm_event);
3506
3507         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3508
3509
3510         /* notify OF layer about this connection error event */
3511         cm_id->rem_ref(cm_id);
3512
3513         return;
3514 }
3515
3516
3517 /**
3518  * cm_event_mpa_req
3519  */
3520 static void cm_event_mpa_req(struct nes_cm_event *event)
3521 {
3522         struct iw_cm_id   *cm_id;
3523         struct iw_cm_event cm_event;
3524         int ret;
3525         struct nes_cm_node *cm_node;
3526
3527         cm_node = event->cm_node;
3528         if (!cm_node)
3529                 return;
3530         cm_id = cm_node->cm_id;
3531
3532         atomic_inc(&cm_connect_reqs);
3533         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3534                         cm_node, cm_id, jiffies);
3535
3536         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3537         cm_event.status = 0;
3538         cm_event.provider_data = (void *)cm_node;
3539
3540         cm_event.local_addr.sin_family = AF_INET;
3541         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3542         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3543
3544         cm_event.remote_addr.sin_family = AF_INET;
3545         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3546         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3547         cm_event.private_data = cm_node->mpa_frame_buf;
3548         cm_event.private_data_len  = (u8) cm_node->mpa_frame_size;
3549
3550         ret = cm_id->event_handler(cm_id, &cm_event);
3551         if (ret)
3552                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3553                                 __func__, __LINE__, ret);
3554         return;
3555 }
3556
3557
3558 static void cm_event_mpa_reject(struct nes_cm_event *event)
3559 {
3560         struct iw_cm_id   *cm_id;
3561         struct iw_cm_event cm_event;
3562         struct nes_cm_node *cm_node;
3563         int ret;
3564
3565         cm_node = event->cm_node;
3566         if (!cm_node)
3567                 return;
3568         cm_id = cm_node->cm_id;
3569
3570         atomic_inc(&cm_connect_reqs);
3571         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3572                         cm_node, cm_id, jiffies);
3573
3574         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3575         cm_event.status = -ECONNREFUSED;
3576         cm_event.provider_data = cm_id->provider_data;
3577
3578         cm_event.local_addr.sin_family = AF_INET;
3579         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3580         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3581
3582         cm_event.remote_addr.sin_family = AF_INET;
3583         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3584         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3585
3586         cm_event.private_data = cm_node->mpa_frame_buf;
3587         cm_event.private_data_len = (u8) cm_node->mpa_frame_size;
3588
3589         nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3590                         "remove_addr=%08x\n",
3591                         cm_event.local_addr.sin_addr.s_addr,
3592                         cm_event.remote_addr.sin_addr.s_addr);
3593
3594         ret = cm_id->event_handler(cm_id, &cm_event);
3595         if (ret)
3596                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3597                                 __func__, __LINE__, ret);
3598
3599         return;
3600 }
3601
3602
3603 static void nes_cm_event_handler(struct work_struct *);
3604
3605 /**
3606  * nes_cm_post_event
3607  * post an event to the cm event handler
3608  */
3609 static int nes_cm_post_event(struct nes_cm_event *event)
3610 {
3611         atomic_inc(&event->cm_node->cm_core->events_posted);
3612         add_ref_cm_node(event->cm_node);
3613         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3614         INIT_WORK(&event->event_work, nes_cm_event_handler);
3615         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3616                 event->cm_node, event);
3617
3618         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3619
3620         nes_debug(NES_DBG_CM, "Exit\n");
3621         return 0;
3622 }
3623
3624
3625 /**
3626  * nes_cm_event_handler
3627  * worker function to handle cm events
3628  * will free instance of nes_cm_event
3629  */
3630 static void nes_cm_event_handler(struct work_struct *work)
3631 {
3632         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3633                         event_work);
3634         struct nes_cm_core *cm_core;
3635
3636         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3637                 return;
3638
3639         cm_core = event->cm_node->cm_core;
3640         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3641                 event, event->type, atomic_read(&cm_core->events_posted));
3642
3643         switch (event->type) {
3644         case NES_CM_EVENT_MPA_REQ:
3645                 cm_event_mpa_req(event);
3646                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3647                         event->cm_node);
3648                 break;
3649         case NES_CM_EVENT_RESET:
3650                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3651                         event->cm_node);
3652                 cm_event_reset(event);
3653                 break;
3654         case NES_CM_EVENT_CONNECTED:
3655                 if ((!event->cm_node->cm_id) ||
3656                         (event->cm_node->state != NES_CM_STATE_TSA))
3657                         break;
3658                 cm_event_connected(event);
3659                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3660                 break;
3661         case NES_CM_EVENT_MPA_REJECT:
3662                 if ((!event->cm_node->cm_id) ||
3663                                 (event->cm_node->state == NES_CM_STATE_TSA))
3664                         break;
3665                 cm_event_mpa_reject(event);
3666                 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3667                 break;
3668
3669         case NES_CM_EVENT_ABORTED:
3670                 if ((!event->cm_node->cm_id) ||
3671                         (event->cm_node->state == NES_CM_STATE_TSA))
3672                         break;
3673                 cm_event_connect_error(event);
3674                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3675                 break;
3676         case NES_CM_EVENT_DROPPED_PKT:
3677                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3678                 break;
3679         default:
3680                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3681                 break;
3682         }
3683
3684         atomic_dec(&cm_core->events_posted);
3685         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3686         rem_ref_cm_node(cm_core, event->cm_node);
3687         kfree(event);
3688
3689         return;
3690 }