drivers/infiniband/hw/nes/nes_cm.c

   1 /*
   2  * Copyright (c) 2006 - 2009 Intel Corporation.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34
  35 #define TCPOPT_TIMESTAMP 8
  36
  37 #include <asm/atomic.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/ip.h>
  40 #include <linux/tcp.h>
  41 #include <linux/init.h>
  42 #include <linux/if_arp.h>
  43 #include <linux/if_vlan.h>
  44 #include <linux/notifier.h>
  45 #include <linux/net.h>
  46 #include <linux/types.h>
  47 #include <linux/timer.h>
  48 #include <linux/time.h>
  49 #include <linux/delay.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/random.h>
  53 #include <linux/list.h>
  54 #include <linux/threads.h>
  55 #include <linux/highmem.h>
  56 #include <linux/slab.h>
  57 #include <net/arp.h>
  58 #include <net/neighbour.h>
  59 #include <net/route.h>
  60 #include <net/ip_fib.h>
  61 #include <net/tcp.h>
  62
  63 #include "nes.h"
  64
  65 u32 cm_packets_sent;
  66 u32 cm_packets_bounced;
  67 u32 cm_packets_dropped;
  68 u32 cm_packets_retrans;
  69 u32 cm_packets_created;
  70 u32 cm_packets_received;
  71 atomic_t cm_listens_created;
  72 atomic_t cm_listens_destroyed;
  73 u32 cm_backlog_drops;
  74 atomic_t cm_loopbacks;
  75 atomic_t cm_nodes_created;
  76 atomic_t cm_nodes_destroyed;
  77 atomic_t cm_accel_dropped_pkts;
  78 atomic_t cm_resets_recvd;
  79
  80 static inline int mini_cm_accelerated(struct nes_cm_core *,
  81         struct nes_cm_node *);
  82 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
  83         struct nes_vnic *, struct nes_cm_info *);
  84 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
  85 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *,
  86         struct nes_vnic *, u16, void *, struct nes_cm_info *);
  87 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
  88 static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
  89         struct nes_cm_node *);
  90 static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
  91         struct nes_cm_node *);
  92 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *,
  93         struct sk_buff *);
  94 static int mini_cm_dealloc_core(struct nes_cm_core *);
  95 static int mini_cm_get(struct nes_cm_core *);
  96 static int mini_cm_set(struct nes_cm_core *, u32, u32);
  97
  98 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *,
  99         void *, u32, void *, u32, u8);
 100 static int add_ref_cm_node(struct nes_cm_node *);
 101 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
 102
 103 static int nes_cm_disconn_true(struct nes_qp *);
 104 static int nes_cm_post_event(struct nes_cm_event *event);
 105 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
 106 static void nes_disconnect_worker(struct work_struct *work);
 107
 108 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
 109 static int send_mpa_reject(struct nes_cm_node *);
 110 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
 111 static int send_reset(struct nes_cm_node *, struct sk_buff *);
 112 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
 113 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
 114 static void process_packet(struct nes_cm_node *, struct sk_buff *,
 115         struct nes_cm_core *);
 116
 117 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
 118 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
 119 static void cleanup_retrans_entry(struct nes_cm_node *);
 120 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
 121 static void free_retrans_entry(struct nes_cm_node *cm_node);
 122 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
 123         struct sk_buff *skb, int optionsize, int passive);
 124
 125 /* CM event handler functions */
 126 static void cm_event_connected(struct nes_cm_event *);
 127 static void cm_event_connect_error(struct nes_cm_event *);
 128 static void cm_event_reset(struct nes_cm_event *);
 129 static void cm_event_mpa_req(struct nes_cm_event *);
 130 static void cm_event_mpa_reject(struct nes_cm_event *);
 131 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
 132
 133 static void print_core(struct nes_cm_core *core);
 134
 135 /* External CM API Interface */
 136 /* instance of function pointers for client API */
 137 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
 138 static struct nes_cm_ops nes_cm_api = {
 139         mini_cm_accelerated,
 140         mini_cm_listen,
 141         mini_cm_del_listen,
 142         mini_cm_connect,
 143         mini_cm_close,
 144         mini_cm_accept,
 145         mini_cm_reject,
 146         mini_cm_recv_pkt,
 147         mini_cm_dealloc_core,
 148         mini_cm_get,
 149         mini_cm_set
 150 };
 151
 152 static struct nes_cm_core *g_cm_core;
 153
 154 atomic_t cm_connects;
 155 atomic_t cm_accepts;
 156 atomic_t cm_disconnects;
 157 atomic_t cm_closes;
 158 atomic_t cm_connecteds;
 159 atomic_t cm_connect_reqs;
 160 atomic_t cm_rejects;
 161
 162
 163 /**
 164  * create_event
 165  */
 166 static struct nes_cm_event *create_event(struct nes_cm_node *cm_node,
 167                 enum nes_cm_event_type type)
 168 {
 169         struct nes_cm_event *event;
 170
 171         if (!cm_node->cm_id)
 172                 return NULL;
 173
 174         /* allocate an empty event */
 175         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 176
 177         if (!event)
 178                 return NULL;
 179
 180         event->type = type;
 181         event->cm_node = cm_node;
 182         event->cm_info.rem_addr = cm_node->rem_addr;
 183         event->cm_info.loc_addr = cm_node->loc_addr;
 184         event->cm_info.rem_port = cm_node->rem_port;
 185         event->cm_info.loc_port = cm_node->loc_port;
 186         event->cm_info.cm_id = cm_node->cm_id;
 187
 188         nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
 189                 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
 190                 cm_node, event, type, event->cm_info.loc_addr,
 191                 event->cm_info.loc_port, event->cm_info.rem_addr,
 192                 event->cm_info.rem_port);
 193
 194         nes_cm_post_event(event);
 195         return event;
 196 }
 197
 198
 199 /**
 200  * send_mpa_request
 201  */
 202 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
 203 {
 204         if (!skb) {
 205                 nes_debug(NES_DBG_CM, "skb set to NULL\n");
 206                 return -1;
 207         }
 208
 209         /* send an MPA Request frame */
 210         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 211                         cm_node->mpa_frame_size, SET_ACK);
 212
 213         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 214 }
 215
 216
 217
 218 static int send_mpa_reject(struct nes_cm_node *cm_node)
 219 {
 220         struct sk_buff  *skb = NULL;
 221
 222         skb = dev_alloc_skb(MAX_CM_BUFFER);
 223         if (!skb) {
 224                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 225                 return -ENOMEM;
 226         }
 227
 228         /* send an MPA reject frame */
 229         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
 230                         cm_node->mpa_frame_size, SET_ACK | SET_FIN);
 231
 232         cm_node->state = NES_CM_STATE_FIN_WAIT1;
 233         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 234 }
 235
 236
 237 /**
 238  * recv_mpa - process a received TCP pkt, we are expecting an
 239  * IETF MPA frame
 240  */
 241 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
 242                 u32 len)
 243 {
 244         struct ietf_mpa_frame *mpa_frame;
 245
 246         *type = NES_MPA_REQUEST_ACCEPT;
 247
 248         /* assume req frame is in tcp data payload */
 249         if (len < sizeof(struct ietf_mpa_frame)) {
 250                 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
 251                 return -EINVAL;
 252         }
 253
 254         mpa_frame = (struct ietf_mpa_frame *)buffer;
 255         cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
 256         /* make sure mpa private data len is less than 512 bytes */
 257         if (cm_node->mpa_frame_size > IETF_MAX_PRIV_DATA_LEN) {
 258                 nes_debug(NES_DBG_CM, "The received Length of Private"
 259                         " Data field exceeds 512 octets\n");
 260                 return -EINVAL;
 261         }
 262         /*
 263          * make sure MPA receiver interoperate with the
 264          * received MPA version and MPA key information
 265          *
 266          */
 267         if (mpa_frame->rev != mpa_version) {
 268                 nes_debug(NES_DBG_CM, "The received mpa version"
 269                                 " can not be interoperated\n");
 270                 return -EINVAL;
 271         }
 272         if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
 273                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
 274                         nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
 275                         return -EINVAL;
 276                 }
 277         } else {
 278                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
 279                         nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
 280                         return -EINVAL;
 281                 }
 282         }
 283
 284         if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
 285                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
 286                                 " complete (%x + %x != %x)\n",
 287                                 cm_node->mpa_frame_size,
 288                                 (u32)sizeof(struct ietf_mpa_frame), len);
 289                 return -EINVAL;
 290         }
 291         /* make sure it does not exceed the max size */
 292         if (len > MAX_CM_BUFFER) {
 293                 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
 294                                 " (%x + %x != %x)\n",
 295                                 cm_node->mpa_frame_size,
 296                                 (u32)sizeof(struct ietf_mpa_frame), len);
 297                 return -EINVAL;
 298         }
 299
 300         /* copy entire MPA frame to our cm_node's frame */
 301         memcpy(cm_node->mpa_frame_buf, buffer + sizeof(struct ietf_mpa_frame),
 302                         cm_node->mpa_frame_size);
 303
 304         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
 305                 *type = NES_MPA_REQUEST_REJECT;
 306         return 0;
 307 }
 308
 309
 310 /**
 311  * form_cm_frame - get a free packet and build empty frame Use
 312  * node info to build.
 313  */
 314 static void form_cm_frame(struct sk_buff *skb,
 315         struct nes_cm_node *cm_node, void *options, u32 optionsize,
 316         void *data, u32 datasize, u8 flags)
 317 {
 318         struct tcphdr *tcph;
 319         struct iphdr *iph;
 320         struct ethhdr *ethh;
 321         u8 *buf;
 322         u16 packetsize = sizeof(*iph);
 323
 324         packetsize += sizeof(*tcph);
 325         packetsize +=  optionsize + datasize;
 326
 327         memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
 328
 329         skb->len = 0;
 330         buf = skb_put(skb, packetsize + ETH_HLEN);
 331
 332         ethh = (struct ethhdr *) buf;
 333         buf += ETH_HLEN;
 334
 335         iph = (struct iphdr *)buf;
 336         buf += sizeof(*iph);
 337         tcph = (struct tcphdr *)buf;
 338         skb_reset_mac_header(skb);
 339         skb_set_network_header(skb, ETH_HLEN);
 340         skb_set_transport_header(skb, ETH_HLEN+sizeof(*iph));
 341         buf += sizeof(*tcph);
 342
 343         skb->ip_summed = CHECKSUM_PARTIAL;
 344         skb->protocol = htons(0x800);
 345         skb->data_len = 0;
 346         skb->mac_len = ETH_HLEN;
 347
 348         memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
 349         memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
 350         ethh->h_proto = htons(0x0800);
 351
 352         iph->version = IPVERSION;
 353         iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
 354         iph->tos = 0;
 355         iph->tot_len = htons(packetsize);
 356         iph->id = htons(++cm_node->tcp_cntxt.loc_id);
 357
 358         iph->frag_off = htons(0x4000);
 359         iph->ttl = 0x40;
 360         iph->protocol = 0x06;   /* IPPROTO_TCP */
 361
 362         iph->saddr = htonl(cm_node->loc_addr);
 363         iph->daddr = htonl(cm_node->rem_addr);
 364
 365         tcph->source = htons(cm_node->loc_port);
 366         tcph->dest = htons(cm_node->rem_port);
 367         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
 368
 369         if (flags & SET_ACK) {
 370                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
 371                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
 372                 tcph->ack = 1;
 373         } else
 374                 tcph->ack_seq = 0;
 375
 376         if (flags & SET_SYN) {
 377                 cm_node->tcp_cntxt.loc_seq_num++;
 378                 tcph->syn = 1;
 379         } else
 380                 cm_node->tcp_cntxt.loc_seq_num += datasize;
 381
 382         if (flags & SET_FIN) {
 383                 cm_node->tcp_cntxt.loc_seq_num++;
 384                 tcph->fin = 1;
 385         }
 386
 387         if (flags & SET_RST)
 388                 tcph->rst = 1;
 389
 390         tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
 391         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
 392         tcph->urg_ptr = 0;
 393         if (optionsize)
 394                 memcpy(buf, options, optionsize);
 395         buf += optionsize;
 396         if (datasize)
 397                 memcpy(buf, data, datasize);
 398
 399         skb_shinfo(skb)->nr_frags = 0;
 400         cm_packets_created++;
 401
 402 }
 403
 404
 405 /**
 406  * print_core - dump a cm core
 407  */
 408 static void print_core(struct nes_cm_core *core)
 409 {
 410         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 411         nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
 412         if (!core)
 413                 return;
 414         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 415
 416         nes_debug(NES_DBG_CM, "State         : %u \n",  core->state);
 417
 418         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
 419         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
 420
 421         nes_debug(NES_DBG_CM, "core          : %p \n", core);
 422
 423         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
 424 }
 425
 426
 427 /**
 428  * schedule_nes_timer
 429  * note - cm_node needs to be protected before calling this. Encase in:
 430  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 431  */
 432 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
 433                 enum nes_timer_type type, int send_retrans,
 434                 int close_when_complete)
 435 {
 436         unsigned long  flags;
 437         struct nes_cm_core *cm_core = cm_node->cm_core;
 438         struct nes_timer_entry *new_send;
 439         int ret = 0;
 440         u32 was_timer_set;
 441
 442         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
 443         if (!new_send)
 444                 return -ENOMEM;
 445
 446         /* new_send->timetosend = currenttime */
 447         new_send->retrycount = NES_DEFAULT_RETRYS;
 448         new_send->retranscount = NES_DEFAULT_RETRANS;
 449         new_send->skb = skb;
 450         new_send->timetosend = jiffies;
 451         new_send->type = type;
 452         new_send->netdev = cm_node->netdev;
 453         new_send->send_retrans = send_retrans;
 454         new_send->close_when_complete = close_when_complete;
 455
 456         if (type == NES_TIMER_TYPE_CLOSE) {
 457                 new_send->timetosend += (HZ/10);
 458                 if (cm_node->recv_entry) {
 459                         kfree(new_send);
 460                         WARN_ON(1);
 461                         return -EINVAL;
 462                 }
 463                 cm_node->recv_entry = new_send;
 464         }
 465
 466         if (type == NES_TIMER_TYPE_SEND) {
 467                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 468                 atomic_inc(&new_send->skb->users);
 469                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 470                 cm_node->send_entry = new_send;
 471                 add_ref_cm_node(cm_node);
 472                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 473                 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
 474
 475                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
 476                 if (ret != NETDEV_TX_OK) {
 477                         nes_debug(NES_DBG_CM, "Error sending packet %p "
 478                                 "(jiffies = %lu)\n", new_send, jiffies);
 479                         new_send->timetosend = jiffies;
 480                         ret = NETDEV_TX_OK;
 481                 } else {
 482                         cm_packets_sent++;
 483                         if (!send_retrans) {
 484                                 cleanup_retrans_entry(cm_node);
 485                                 if (close_when_complete)
 486                                         rem_ref_cm_node(cm_core, cm_node);
 487                                 return ret;
 488                         }
 489                 }
 490         }
 491
 492         was_timer_set = timer_pending(&cm_core->tcp_timer);
 493
 494         if (!was_timer_set) {
 495                 cm_core->tcp_timer.expires = new_send->timetosend;
 496                 add_timer(&cm_core->tcp_timer);
 497         }
 498
 499         return ret;
 500 }
 501
 502 static void nes_retrans_expired(struct nes_cm_node *cm_node)
 503 {
 504         struct iw_cm_id *cm_id = cm_node->cm_id;
 505         enum nes_cm_node_state state = cm_node->state;
 506         cm_node->state = NES_CM_STATE_CLOSED;
 507         switch (state) {
 508         case NES_CM_STATE_SYN_RCVD:
 509         case NES_CM_STATE_CLOSING:
 510                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 511                 break;
 512         case NES_CM_STATE_LAST_ACK:
 513         case NES_CM_STATE_FIN_WAIT1:
 514                 if (cm_node->cm_id)
 515                         cm_id->rem_ref(cm_id);
 516                 send_reset(cm_node, NULL);
 517                 break;
 518         default:
 519                 add_ref_cm_node(cm_node);
 520                 send_reset(cm_node, NULL);
 521                 create_event(cm_node, NES_CM_EVENT_ABORTED);
 522         }
 523 }
 524
 525 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
 526 {
 527         struct nes_timer_entry *recv_entry = cm_node->recv_entry;
 528         struct iw_cm_id *cm_id = cm_node->cm_id;
 529         struct nes_qp *nesqp;
 530         unsigned long qplockflags;
 531
 532         if (!recv_entry)
 533                 return;
 534         nesqp = (struct nes_qp *)recv_entry->skb;
 535         if (nesqp) {
 536                 spin_lock_irqsave(&nesqp->lock, qplockflags);
 537                 if (nesqp->cm_id) {
 538                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 539                                 "refcount = %d: HIT A "
 540                                 "NES_TIMER_TYPE_CLOSE with something "
 541                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 542                                 atomic_read(&nesqp->refcount));
 543                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
 544                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
 545                         nesqp->ibqp_state = IB_QPS_ERR;
 546                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 547                         nes_cm_disconn(nesqp);
 548                 } else {
 549                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 550                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 551                                 "refcount = %d: HIT A "
 552                                 "NES_TIMER_TYPE_CLOSE with nothing "
 553                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 554                                 atomic_read(&nesqp->refcount));
 555                 }
 556         } else if (rem_node) {
 557                 /* TIME_WAIT state */
 558                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 559         }
 560         if (cm_node->cm_id)
 561                 cm_id->rem_ref(cm_id);
 562         kfree(recv_entry);
 563         cm_node->recv_entry = NULL;
 564 }
 565
 566 /**
 567  * nes_cm_timer_tick
 568  */
 569 static void nes_cm_timer_tick(unsigned long pass)
 570 {
 571         unsigned long flags;
 572         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
 573         struct nes_cm_node *cm_node;
 574         struct nes_timer_entry *send_entry, *recv_entry;
 575         struct list_head *list_core_temp;
 576         struct list_head *list_node;
 577         struct nes_cm_core *cm_core = g_cm_core;
 578         u32 settimer = 0;
 579         unsigned long timetosend;
 580         int ret = NETDEV_TX_OK;
 581
 582         struct list_head timer_list;
 583         INIT_LIST_HEAD(&timer_list);
 584         spin_lock_irqsave(&cm_core->ht_lock, flags);
 585
 586         list_for_each_safe(list_node, list_core_temp,
 587                                 &cm_core->connected_nodes) {
 588                 cm_node = container_of(list_node, struct nes_cm_node, list);
 589                 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
 590                         add_ref_cm_node(cm_node);
 591                         list_add(&cm_node->timer_entry, &timer_list);
 592                 }
 593         }
 594         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 595
 596         list_for_each_safe(list_node, list_core_temp, &timer_list) {
 597                 cm_node = container_of(list_node, struct nes_cm_node,
 598                                         timer_entry);
 599                 recv_entry = cm_node->recv_entry;
 600
 601                 if (recv_entry) {
 602                         if (time_after(recv_entry->timetosend, jiffies)) {
 603                                 if (nexttimeout > recv_entry->timetosend ||
 604                                                 !settimer) {
 605                                         nexttimeout = recv_entry->timetosend;
 606                                         settimer = 1;
 607                                 }
 608                         } else
 609                                 handle_recv_entry(cm_node, 1);
 610                 }
 611
 612                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 613                 do {
 614                         send_entry = cm_node->send_entry;
 615                         if (!send_entry)
 616                                 break;
 617                         if (time_after(send_entry->timetosend, jiffies)) {
 618                                 if (cm_node->state != NES_CM_STATE_TSA) {
 619                                         if ((nexttimeout >
 620                                                 send_entry->timetosend) ||
 621                                                 !settimer) {
 622                                                 nexttimeout =
 623                                                         send_entry->timetosend;
 624                                                 settimer = 1;
 625                                         }
 626                                 } else {
 627                                         free_retrans_entry(cm_node);
 628                                 }
 629                                 break;
 630                         }
 631
 632                         if ((cm_node->state == NES_CM_STATE_TSA) ||
 633                                 (cm_node->state == NES_CM_STATE_CLOSED)) {
 634                                 free_retrans_entry(cm_node);
 635                                 break;
 636                         }
 637
 638                         if (!send_entry->retranscount ||
 639                                 !send_entry->retrycount) {
 640                                 cm_packets_dropped++;
 641                                 free_retrans_entry(cm_node);
 642
 643                                 spin_unlock_irqrestore(
 644                                         &cm_node->retrans_list_lock, flags);
 645                                 nes_retrans_expired(cm_node);
 646                                 cm_node->state = NES_CM_STATE_CLOSED;
 647                                 spin_lock_irqsave(&cm_node->retrans_list_lock,
 648                                         flags);
 649                                 break;
 650                         }
 651                         atomic_inc(&send_entry->skb->users);
 652                         cm_packets_retrans++;
 653                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
 654                                 "for node %p, jiffies = %lu, time to send = "
 655                                 "%lu, retranscount = %u, send_entry->seq_num = "
 656                                 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
 657                                 "0x%08X\n", send_entry, cm_node, jiffies,
 658                                 send_entry->timetosend,
 659                                 send_entry->retranscount,
 660                                 send_entry->seq_num,
 661                                 cm_node->tcp_cntxt.rem_ack_num);
 662
 663                         spin_unlock_irqrestore(&cm_node->retrans_list_lock,
 664                                 flags);
 665                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
 666                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 667                         if (ret != NETDEV_TX_OK) {
 668                                 nes_debug(NES_DBG_CM, "rexmit failed for "
 669                                         "node=%p\n", cm_node);
 670                                 cm_packets_bounced++;
 671                                 send_entry->retrycount--;
 672                                 nexttimeout = jiffies + NES_SHORT_TIME;
 673                                 settimer = 1;
 674                                 break;
 675                         } else {
 676                                 cm_packets_sent++;
 677                         }
 678                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
 679                                 "%u, retry count = %u.\n",
 680                                 send_entry->retranscount,
 681                                 send_entry->retrycount);
 682                         if (send_entry->send_retrans) {
 683                                 send_entry->retranscount--;
 684                                 timetosend = (NES_RETRY_TIMEOUT <<
 685                                         (NES_DEFAULT_RETRANS - send_entry->retranscount));
 686
 687                                 send_entry->timetosend = jiffies +
 688                                         min(timetosend, NES_MAX_TIMEOUT);
 689                                 if (nexttimeout > send_entry->timetosend ||
 690                                         !settimer) {
 691                                         nexttimeout = send_entry->timetosend;
 692                                         settimer = 1;
 693                                 }
 694                         } else {
 695                                 int close_when_complete;
 696                                 close_when_complete =
 697                                         send_entry->close_when_complete;
 698                                 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
 699                                         cm_node, cm_node->state);
 700                                 free_retrans_entry(cm_node);
 701                                 if (close_when_complete)
 702                                         rem_ref_cm_node(cm_node->cm_core,
 703                                                 cm_node);
 704                         }
 705                 } while (0);
 706
 707                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 708                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 709         }
 710
 711         if (settimer) {
 712                 if (!timer_pending(&cm_core->tcp_timer)) {
 713                         cm_core->tcp_timer.expires  = nexttimeout;
 714                         add_timer(&cm_core->tcp_timer);
 715                 }
 716         }
 717 }
 718
 719
 720 /**
 721  * send_syn
 722  */
 723 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
 724         struct sk_buff *skb)
 725 {
 726         int ret;
 727         int flags = SET_SYN;
 728         char optionsbuffer[sizeof(struct option_mss) +
 729                 sizeof(struct option_windowscale) + sizeof(struct option_base) +
 730                 TCP_OPTIONS_PADDING];
 731
 732         int optionssize = 0;
 733         /* Sending MSS option */
 734         union all_known_options *options;
 735
 736         if (!cm_node)
 737                 return -EINVAL;
 738
 739         options = (union all_known_options *)&optionsbuffer[optionssize];
 740         options->as_mss.optionnum = OPTION_NUMBER_MSS;
 741         options->as_mss.length = sizeof(struct option_mss);
 742         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
 743         optionssize += sizeof(struct option_mss);
 744
 745         options = (union all_known_options *)&optionsbuffer[optionssize];
 746         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
 747         options->as_windowscale.length = sizeof(struct option_windowscale);
 748         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
 749         optionssize += sizeof(struct option_windowscale);
 750
 751         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
 752                 options = (union all_known_options *)&optionsbuffer[optionssize];
 753                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
 754                 options->as_base.length = sizeof(struct option_base);
 755                 optionssize += sizeof(struct option_base);
 756                 /* we need the size to be a multiple of 4 */
 757                 options = (union all_known_options *)&optionsbuffer[optionssize];
 758                 options->as_end = 1;
 759                 optionssize += 1;
 760                 options = (union all_known_options *)&optionsbuffer[optionssize];
 761                 options->as_end = 1;
 762                 optionssize += 1;
 763         }
 764
 765         options = (union all_known_options *)&optionsbuffer[optionssize];
 766         options->as_end = OPTION_NUMBER_END;
 767         optionssize += 1;
 768
 769         if (!skb)
 770                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 771         if (!skb) {
 772                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 773                 return -1;
 774         }
 775
 776         if (sendack)
 777                 flags |= SET_ACK;
 778
 779         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
 780         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 781
 782         return ret;
 783 }
 784
 785
 786 /**
 787  * send_reset
 788  */
 789 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
 790 {
 791         int ret;
 792         int flags = SET_RST | SET_ACK;
 793
 794         if (!skb)
 795                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 796         if (!skb) {
 797                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 798                 return -ENOMEM;
 799         }
 800
 801         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
 802         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
 803
 804         return ret;
 805 }
 806
 807
 808 /**
 809  * send_ack
 810  */
 811 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
 812 {
 813         int ret;
 814
 815         if (!skb)
 816                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 817
 818         if (!skb) {
 819                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 820                 return -1;
 821         }
 822
 823         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
 824         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
 825
 826         return ret;
 827 }
 828
 829
 830 /**
 831  * send_fin
 832  */
 833 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
 834 {
 835         int ret;
 836
 837         /* if we didn't get a frame get one */
 838         if (!skb)
 839                 skb = dev_alloc_skb(MAX_CM_BUFFER);
 840
 841         if (!skb) {
 842                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 843                 return -1;
 844         }
 845
 846         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
 847         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 848
 849         return ret;
 850 }
 851
 852
 853 /**
 854  * find_node - find a cm node that matches the reference cm node
 855  */
 856 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
 857                 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
 858 {
 859         unsigned long flags;
 860         struct list_head *hte;
 861         struct nes_cm_node *cm_node;
 862
 863         /* get a handle on the hte */
 864         hte = &cm_core->connected_nodes;
 865
 866         /* walk list and find cm_node associated with this session ID */
 867         spin_lock_irqsave(&cm_core->ht_lock, flags);
 868         list_for_each_entry(cm_node, hte, list) {
 869                 /* compare quad, return node handle if a match */
 870                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
 871                                 cm_node->loc_addr, cm_node->loc_port,
 872                                 loc_addr, loc_port,
 873                                 cm_node->rem_addr, cm_node->rem_port,
 874                                 rem_addr, rem_port);
 875                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
 876                                 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
 877                         add_ref_cm_node(cm_node);
 878                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 879                         return cm_node;
 880                 }
 881         }
 882         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 883
 884         /* no owner node */
 885         return NULL;
 886 }
 887
 888
 889 /**
 890  * find_listener - find a cm node listening on this addr-port pair
 891  */
 892 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
 893                 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
 894 {
 895         unsigned long flags;
 896         struct nes_cm_listener *listen_node;
 897
 898         /* walk list and find cm_node associated with this session ID */
 899         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
 900         list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
 901                 /* compare node pair, return node handle if a match */
 902                 if (((listen_node->loc_addr == dst_addr) ||
 903                                 listen_node->loc_addr == 0x00000000) &&
 904                                 (listen_node->loc_port == dst_port) &&
 905                                 (listener_state & listen_node->listener_state)) {
 906                         atomic_inc(&listen_node->ref_count);
 907                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 908                         return listen_node;
 909                 }
 910         }
 911         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 912
 913         /* no listener */
 914         return NULL;
 915 }
 916
 917
 918 /**
 919  * add_hte_node - add a cm node to the hash table
 920  */
 921 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
 922 {
 923         unsigned long flags;
 924         struct list_head *hte;
 925
 926         if (!cm_node || !cm_core)
 927                 return -EINVAL;
 928
 929         nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
 930                 cm_node);
 931
 932         spin_lock_irqsave(&cm_core->ht_lock, flags);
 933
 934         /* get a handle on the hash table element (list head for this slot) */
 935         hte = &cm_core->connected_nodes;
 936         list_add_tail(&cm_node->list, hte);
 937         atomic_inc(&cm_core->ht_node_cnt);
 938
 939         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 940
 941         return 0;
 942 }
 943
 944
 945 /**
 946  * mini_cm_dec_refcnt_listen
 947  */
 948 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
 949         struct nes_cm_listener *listener, int free_hanging_nodes)
 950 {
 951         int ret = -EINVAL;
 952         int err = 0;
 953         unsigned long flags;
 954         struct list_head *list_pos = NULL;
 955         struct list_head *list_temp = NULL;
 956         struct nes_cm_node *cm_node = NULL;
 957         struct list_head reset_list;
 958
 959         nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
 960                 "refcnt=%d\n", listener, free_hanging_nodes,
 961                 atomic_read(&listener->ref_count));
 962         /* free non-accelerated child nodes for this listener */
 963         INIT_LIST_HEAD(&reset_list);
 964         if (free_hanging_nodes) {
 965                 spin_lock_irqsave(&cm_core->ht_lock, flags);
 966                 list_for_each_safe(list_pos, list_temp,
 967                                    &g_cm_core->connected_nodes) {
 968                         cm_node = container_of(list_pos, struct nes_cm_node,
 969                                 list);
 970                         if ((cm_node->listener == listener) &&
 971                             (!cm_node->accelerated)) {
 972                                 add_ref_cm_node(cm_node);
 973                                 list_add(&cm_node->reset_entry, &reset_list);
 974                         }
 975                 }
 976                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 977         }
 978
 979         list_for_each_safe(list_pos, list_temp, &reset_list) {
 980                 cm_node = container_of(list_pos, struct nes_cm_node,
 981                                 reset_entry);
 982                 {
 983                         struct nes_cm_node *loopback = cm_node->loopbackpartner;
 984                         enum nes_cm_node_state old_state;
 985                         if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
 986                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 987                         } else {
 988                                 if (!loopback) {
 989                                         cleanup_retrans_entry(cm_node);
 990                                         err = send_reset(cm_node, NULL);
 991                                         if (err) {
 992                                                 cm_node->state =
 993                                                          NES_CM_STATE_CLOSED;
 994                                                 WARN_ON(1);
 995                                         } else {
 996                                                 old_state = cm_node->state;
 997                                                 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
 998                                                 if (old_state != NES_CM_STATE_MPAREQ_RCVD)
 999                                                         rem_ref_cm_node(
1000                                                                 cm_node->cm_core,
1001                                                                 cm_node);
1002                                         }
1003                                 } else {
1004                                         struct nes_cm_event event;
1005
1006                                         event.cm_node = loopback;
1007                                         event.cm_info.rem_addr =
1008                                                         loopback->rem_addr;
1009                                         event.cm_info.loc_addr =
1010                                                         loopback->loc_addr;
1011                                         event.cm_info.rem_port =
1012                                                         loopback->rem_port;
1013                                         event.cm_info.loc_port =
1014                                                          loopback->loc_port;
1015                                         event.cm_info.cm_id = loopback->cm_id;
1016                                         add_ref_cm_node(loopback);
1017                                         loopback->state = NES_CM_STATE_CLOSED;
1018                                         cm_event_connect_error(&event);
1019                                         cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1020
1021                                         rem_ref_cm_node(cm_node->cm_core,
1022                                                          cm_node);
1023
1024                                 }
1025                         }
1026                 }
1027         }
1028
1029         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1030         if (!atomic_dec_return(&listener->ref_count)) {
1031                 list_del(&listener->list);
1032
1033                 /* decrement our listen node count */
1034                 atomic_dec(&cm_core->listen_node_cnt);
1035
1036                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1037
1038                 if (listener->nesvnic) {
1039                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
1040                                         PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
1041                 }
1042
1043                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1044
1045                 kfree(listener);
1046                 listener = NULL;
1047                 ret = 0;
1048                 atomic_inc(&cm_listens_destroyed);
1049         } else {
1050                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1051         }
1052         if (listener) {
1053                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1054                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
1055                                         " with non-zero pending accepts=%u\n",
1056                                         listener, atomic_read(&listener->pend_accepts_cnt));
1057         }
1058
1059         return ret;
1060 }
1061
1062
1063 /**
1064  * mini_cm_del_listen
1065  */
1066 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1067                 struct nes_cm_listener *listener)
1068 {
1069         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1070         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1071         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1072 }
1073
1074
1075 /**
1076  * mini_cm_accelerated
1077  */
1078 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1079                 struct nes_cm_node *cm_node)
1080 {
1081         u32 was_timer_set;
1082         cm_node->accelerated = 1;
1083
1084         if (cm_node->accept_pend) {
1085                 BUG_ON(!cm_node->listener);
1086                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1087                 cm_node->accept_pend = 0;
1088                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1089         }
1090
1091         was_timer_set = timer_pending(&cm_core->tcp_timer);
1092         if (!was_timer_set) {
1093                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1094                 add_timer(&cm_core->tcp_timer);
1095         }
1096
1097         return 0;
1098 }
1099
1100
1101 /**
1102  * nes_addr_resolve_neigh
1103  */
1104 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
1105 {
1106         struct rtable *rt;
1107         struct flowi fl;
1108         struct neighbour *neigh;
1109         int rc = arpindex;
1110         struct net_device *netdev;
1111         struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1112
1113         memset(&fl, 0, sizeof fl);
1114         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1115         if (ip_route_output_key(&init_net, &rt, &fl)) {
1116                 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1117                                 __func__, dst_ip);
1118                 return rc;
1119         }
1120
1121         if (nesvnic->netdev->master)
1122                 netdev = nesvnic->netdev->master;
1123         else
1124                 netdev = nesvnic->netdev;
1125
1126         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, netdev);
1127         if (neigh) {
1128                 if (neigh->nud_state & NUD_VALID) {
1129                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1130                                   " is %pM, Gateway is 0x%08X \n", dst_ip,
1131                                   neigh->ha, ntohl(rt->rt_gateway));
1132
1133                         if (arpindex >= 0) {
1134                                 if (!memcmp(nesadapter->arp_table[arpindex].mac_addr,
1135                                                         neigh->ha, ETH_ALEN)){
1136                                         /* Mac address same as in nes_arp_table */
1137                                         neigh_release(neigh);
1138                                         ip_rt_put(rt);
1139                                         return rc;
1140                                 }
1141
1142                                 nes_manage_arp_cache(nesvnic->netdev,
1143                                                 nesadapter->arp_table[arpindex].mac_addr,
1144                                                 dst_ip, NES_ARP_DELETE);
1145                         }
1146
1147                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1148                                              dst_ip, NES_ARP_ADD);
1149                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1150                                            NES_ARP_RESOLVE);
1151                 }
1152                 neigh_release(neigh);
1153         }
1154
1155         if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
1156                 neigh_event_send(rt->dst.neighbour, NULL);
1157
1158         ip_rt_put(rt);
1159         return rc;
1160 }
1161
1162 /**
1163  * make_cm_node - create a new instance of a cm node
1164  */
1165 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1166                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1167                 struct nes_cm_listener *listener)
1168 {
1169         struct nes_cm_node *cm_node;
1170         struct timespec ts;
1171         int oldarpindex = 0;
1172         int arpindex = 0;
1173         struct nes_device *nesdev;
1174         struct nes_adapter *nesadapter;
1175
1176         /* create an hte and cm_node for this instance */
1177         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1178         if (!cm_node)
1179                 return NULL;
1180
1181         /* set our node specific transport info */
1182         cm_node->loc_addr = cm_info->loc_addr;
1183         cm_node->rem_addr = cm_info->rem_addr;
1184         cm_node->loc_port = cm_info->loc_port;
1185         cm_node->rem_port = cm_info->rem_port;
1186         cm_node->send_write0 = send_first;
1187         nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1188                   &cm_node->loc_addr, cm_node->loc_port,
1189                   &cm_node->rem_addr, cm_node->rem_port);
1190         cm_node->listener = listener;
1191         cm_node->netdev = nesvnic->netdev;
1192         cm_node->cm_id = cm_info->cm_id;
1193         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1194
1195         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1196                         cm_node->cm_id);
1197
1198         spin_lock_init(&cm_node->retrans_list_lock);
1199
1200         cm_node->loopbackpartner = NULL;
1201         atomic_set(&cm_node->ref_count, 1);
1202         /* associate our parent CM core */
1203         cm_node->cm_core = cm_core;
1204         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1205         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1206         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1207                         NES_CM_DEFAULT_RCV_WND_SCALE;
1208         ts = current_kernel_time();
1209         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1210         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1211                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1212         cm_node->tcp_cntxt.rcv_nxt = 0;
1213         /* get a unique session ID , add thread_id to an upcounter to handle race */
1214         atomic_inc(&cm_core->node_cnt);
1215         cm_node->conn_type = cm_info->conn_type;
1216         cm_node->apbvt_set = 0;
1217         cm_node->accept_pend = 0;
1218
1219         cm_node->nesvnic = nesvnic;
1220         /* get some device handles, for arp lookup */
1221         nesdev = nesvnic->nesdev;
1222         nesadapter = nesdev->nesadapter;
1223
1224         cm_node->loopbackpartner = NULL;
1225
1226         /* get the mac addr for the remote node */
1227         if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
1228                 arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1229         else {
1230                 oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1231                 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr, oldarpindex);
1232
1233         }
1234         if (arpindex < 0) {
1235                 kfree(cm_node);
1236                 return NULL;
1237         }
1238
1239         /* copy the mac addr to node context */
1240         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1241         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1242                   cm_node->rem_mac);
1243
1244         add_hte_node(cm_core, cm_node);
1245         atomic_inc(&cm_nodes_created);
1246
1247         return cm_node;
1248 }
1249
1250
1251 /**
1252  * add_ref_cm_node - destroy an instance of a cm node
1253  */
1254 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1255 {
1256         atomic_inc(&cm_node->ref_count);
1257         return 0;
1258 }
1259
1260
1261 /**
1262  * rem_ref_cm_node - destroy an instance of a cm node
1263  */
1264 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1265         struct nes_cm_node *cm_node)
1266 {
1267         unsigned long flags;
1268         struct nes_qp *nesqp;
1269
1270         if (!cm_node)
1271                 return -EINVAL;
1272
1273         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1274         if (atomic_dec_return(&cm_node->ref_count)) {
1275                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1276                 return 0;
1277         }
1278         list_del(&cm_node->list);
1279         atomic_dec(&cm_core->ht_node_cnt);
1280         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1281
1282         /* if the node is destroyed before connection was accelerated */
1283         if (!cm_node->accelerated && cm_node->accept_pend) {
1284                 BUG_ON(!cm_node->listener);
1285                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1286                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1287         }
1288         WARN_ON(cm_node->send_entry);
1289         if (cm_node->recv_entry)
1290                 handle_recv_entry(cm_node, 0);
1291         if (cm_node->listener) {
1292                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1293         } else {
1294                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1295                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1296                                 PCI_FUNC(
1297                                 cm_node->nesvnic->nesdev->pcidev->devfn),
1298                                 NES_MANAGE_APBVT_DEL);
1299                 }
1300         }
1301
1302         atomic_dec(&cm_core->node_cnt);
1303         atomic_inc(&cm_nodes_destroyed);
1304         nesqp = cm_node->nesqp;
1305         if (nesqp) {
1306                 nesqp->cm_node = NULL;
1307                 nes_rem_ref(&nesqp->ibqp);
1308                 cm_node->nesqp = NULL;
1309         }
1310
1311         kfree(cm_node);
1312         return 0;
1313 }
1314
1315 /**
1316  * process_options
1317  */
1318 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1319         u32 optionsize, u32 syn_packet)
1320 {
1321         u32 tmp;
1322         u32 offset = 0;
1323         union all_known_options *all_options;
1324         char got_mss_option = 0;
1325
1326         while (offset < optionsize) {
1327                 all_options = (union all_known_options *)(optionsloc + offset);
1328                 switch (all_options->as_base.optionnum) {
1329                 case OPTION_NUMBER_END:
1330                         offset = optionsize;
1331                         break;
1332                 case OPTION_NUMBER_NONE:
1333                         offset += 1;
1334                         continue;
1335                 case OPTION_NUMBER_MSS:
1336                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1337                                 "Size: %d\n", __func__,
1338                                 all_options->as_mss.length, offset, optionsize);
1339                         got_mss_option = 1;
1340                         if (all_options->as_mss.length != 4) {
1341                                 return 1;
1342                         } else {
1343                                 tmp = ntohs(all_options->as_mss.mss);
1344                                 if (tmp > 0 && tmp <
1345                                         cm_node->tcp_cntxt.mss)
1346                                         cm_node->tcp_cntxt.mss = tmp;
1347                         }
1348                         break;
1349                 case OPTION_NUMBER_WINDOW_SCALE:
1350                         cm_node->tcp_cntxt.snd_wscale =
1351                                 all_options->as_windowscale.shiftcount;
1352                         break;
1353                 case OPTION_NUMBER_WRITE0:
1354                         cm_node->send_write0 = 1;
1355                         break;
1356                 default:
1357                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1358                                 all_options->as_base.optionnum);
1359                         break;
1360                 }
1361                 offset += all_options->as_base.length;
1362         }
1363         if ((!got_mss_option) && (syn_packet))
1364                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1365         return 0;
1366 }
1367
1368 static void drop_packet(struct sk_buff *skb)
1369 {
1370         atomic_inc(&cm_accel_dropped_pkts);
1371         dev_kfree_skb_any(skb);
1372 }
1373
1374 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1375 {
1376         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1377                 "refcnt=%d\n", cm_node, cm_node->state,
1378                 atomic_read(&cm_node->ref_count));
1379         switch (cm_node->state) {
1380         case NES_CM_STATE_SYN_RCVD:
1381         case NES_CM_STATE_SYN_SENT:
1382         case NES_CM_STATE_ESTABLISHED:
1383         case NES_CM_STATE_MPAREJ_RCVD:
1384                 cm_node->tcp_cntxt.rcv_nxt++;
1385                 cleanup_retrans_entry(cm_node);
1386                 cm_node->state = NES_CM_STATE_LAST_ACK;
1387                 send_fin(cm_node, NULL);
1388                 break;
1389         case NES_CM_STATE_MPAREQ_SENT:
1390                 create_event(cm_node, NES_CM_EVENT_ABORTED);
1391                 cm_node->tcp_cntxt.rcv_nxt++;
1392                 cleanup_retrans_entry(cm_node);
1393                 cm_node->state = NES_CM_STATE_CLOSED;
1394                 add_ref_cm_node(cm_node);
1395                 send_reset(cm_node, NULL);
1396                 break;
1397         case NES_CM_STATE_FIN_WAIT1:
1398                 cm_node->tcp_cntxt.rcv_nxt++;
1399                 cleanup_retrans_entry(cm_node);
1400                 cm_node->state = NES_CM_STATE_CLOSING;
1401                 send_ack(cm_node, NULL);
1402                 /* Wait for ACK as this is simultanous close..
1403                 * After we receive ACK, do not send anything..
1404                 * Just rm the node.. Done.. */
1405                 break;
1406         case NES_CM_STATE_FIN_WAIT2:
1407                 cm_node->tcp_cntxt.rcv_nxt++;
1408                 cleanup_retrans_entry(cm_node);
1409                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1410                 send_ack(cm_node, NULL);
1411                 schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
1412                 break;
1413         case NES_CM_STATE_TIME_WAIT:
1414                 cm_node->tcp_cntxt.rcv_nxt++;
1415                 cleanup_retrans_entry(cm_node);
1416                 cm_node->state = NES_CM_STATE_CLOSED;
1417                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1418                 break;
1419         case NES_CM_STATE_TSA:
1420         default:
1421                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1422                         cm_node, cm_node->state);
1423                 break;
1424         }
1425 }
1426
1427
1428 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1429         struct tcphdr *tcph)
1430 {
1431
1432         int     reset = 0;      /* whether to send reset in case of err.. */
1433         atomic_inc(&cm_resets_recvd);
1434         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1435                         " refcnt=%d\n", cm_node, cm_node->state,
1436                         atomic_read(&cm_node->ref_count));
1437         cleanup_retrans_entry(cm_node);
1438         switch (cm_node->state) {
1439         case NES_CM_STATE_SYN_SENT:
1440         case NES_CM_STATE_MPAREQ_SENT:
1441                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1442                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1443                         cm_node->listener, cm_node->state);
1444                 active_open_err(cm_node, skb, reset);
1445                 break;
1446         case NES_CM_STATE_MPAREQ_RCVD:
1447                 atomic_inc(&cm_node->passive_state);
1448                 dev_kfree_skb_any(skb);
1449                 break;
1450         case NES_CM_STATE_ESTABLISHED:
1451         case NES_CM_STATE_SYN_RCVD:
1452         case NES_CM_STATE_LISTENING:
1453                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1454                 passive_open_err(cm_node, skb, reset);
1455                 break;
1456         case NES_CM_STATE_TSA:
1457                 active_open_err(cm_node, skb, reset);
1458                 break;
1459         case NES_CM_STATE_CLOSED:
1460                 drop_packet(skb);
1461                 break;
1462         case NES_CM_STATE_FIN_WAIT2:
1463         case NES_CM_STATE_FIN_WAIT1:
1464         case NES_CM_STATE_LAST_ACK:
1465                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1466         case NES_CM_STATE_TIME_WAIT:
1467                 cm_node->state = NES_CM_STATE_CLOSED;
1468                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1469                 drop_packet(skb);
1470                 break;
1471         default:
1472                 drop_packet(skb);
1473                 break;
1474         }
1475 }
1476
1477
1478 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1479 {
1480
1481         int     ret = 0;
1482         int datasize = skb->len;
1483         u8 *dataloc = skb->data;
1484
1485         enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1486         u32     res_type;
1487         ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1488         if (ret) {
1489                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1490                 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1491                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1492                                 "cm_node=%p listener=%p state=%d\n", __func__,
1493                                 __LINE__, cm_node, cm_node->listener,
1494                                 cm_node->state);
1495                         active_open_err(cm_node, skb, 1);
1496                 } else {
1497                         passive_open_err(cm_node, skb, 1);
1498                 }
1499                 return;
1500         }
1501
1502         switch (cm_node->state) {
1503         case NES_CM_STATE_ESTABLISHED:
1504                 if (res_type == NES_MPA_REQUEST_REJECT) {
1505                         /*BIG problem as we are receiving the MPA.. So should
1506                         * not be REJECT.. This is Passive Open.. We can
1507                         * only receive it Reject for Active Open...*/
1508                         WARN_ON(1);
1509                 }
1510                 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1511                 type = NES_CM_EVENT_MPA_REQ;
1512                 atomic_set(&cm_node->passive_state,
1513                                 NES_PASSIVE_STATE_INDICATED);
1514                 break;
1515         case NES_CM_STATE_MPAREQ_SENT:
1516                 cleanup_retrans_entry(cm_node);
1517                 if (res_type == NES_MPA_REQUEST_REJECT) {
1518                         type = NES_CM_EVENT_MPA_REJECT;
1519                         cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1520                 } else {
1521                         type = NES_CM_EVENT_CONNECTED;
1522                         cm_node->state = NES_CM_STATE_TSA;
1523                 }
1524
1525                 break;
1526         default:
1527                 WARN_ON(1);
1528                 break;
1529         }
1530         dev_kfree_skb_any(skb);
1531         create_event(cm_node, type);
1532 }
1533
1534 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1535 {
1536         switch (cm_node->state) {
1537         case NES_CM_STATE_SYN_SENT:
1538         case NES_CM_STATE_MPAREQ_SENT:
1539                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1540                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1541                         cm_node->listener, cm_node->state);
1542                 active_open_err(cm_node, skb, 1);
1543                 break;
1544         case NES_CM_STATE_ESTABLISHED:
1545         case NES_CM_STATE_SYN_RCVD:
1546                 passive_open_err(cm_node, skb, 1);
1547                 break;
1548         case NES_CM_STATE_TSA:
1549         default:
1550                 drop_packet(skb);
1551         }
1552 }
1553
1554 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1555         struct sk_buff *skb)
1556 {
1557         int err;
1558
1559         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1560         if (err)
1561                 active_open_err(cm_node, skb, 1);
1562
1563         return err;
1564 }
1565
1566 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1567         struct sk_buff *skb)
1568 {
1569         int err = 0;
1570         u32 seq;
1571         u32 ack_seq;
1572         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1573         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1574         u32 rcv_wnd;
1575         seq = ntohl(tcph->seq);
1576         ack_seq = ntohl(tcph->ack_seq);
1577         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1578         if (ack_seq != loc_seq_num)
1579                 err = 1;
1580         else if (!between(seq, rcv_nxt, (rcv_nxt+rcv_wnd)))
1581                 err = 1;
1582         if (err) {
1583                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1584                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1585                         cm_node->listener, cm_node->state);
1586                 indicate_pkt_err(cm_node, skb);
1587                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1588                         "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1589                         rcv_wnd);
1590         }
1591         return err;
1592 }
1593
1594 /*
1595  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1596  * is created with a listener or it may comein as rexmitted packet which in
1597  * that case will be just dropped.
1598  */
1599
1600 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1601         struct tcphdr *tcph)
1602 {
1603         int ret;
1604         u32 inc_sequence;
1605         int optionsize;
1606
1607         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1608         skb_trim(skb, 0);
1609         inc_sequence = ntohl(tcph->seq);
1610
1611         switch (cm_node->state) {
1612         case NES_CM_STATE_SYN_SENT:
1613         case NES_CM_STATE_MPAREQ_SENT:
1614                 /* Rcvd syn on active open connection*/
1615                 active_open_err(cm_node, skb, 1);
1616                 break;
1617         case NES_CM_STATE_LISTENING:
1618                 /* Passive OPEN */
1619                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1620                                 cm_node->listener->backlog) {
1621                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1622                                 "pressure \n");
1623                         cm_backlog_drops++;
1624                         passive_open_err(cm_node, skb, 0);
1625                         break;
1626                 }
1627                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1628                         1);
1629                 if (ret) {
1630                         passive_open_err(cm_node, skb, 0);
1631                         /* drop pkt */
1632                         break;
1633                 }
1634                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1635                 BUG_ON(cm_node->send_entry);
1636                 cm_node->accept_pend = 1;
1637                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1638
1639                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1640                 send_syn(cm_node, 1, skb);
1641                 break;
1642         case NES_CM_STATE_CLOSED:
1643                 cleanup_retrans_entry(cm_node);
1644                 add_ref_cm_node(cm_node);
1645                 send_reset(cm_node, skb);
1646                 break;
1647         case NES_CM_STATE_TSA:
1648         case NES_CM_STATE_ESTABLISHED:
1649         case NES_CM_STATE_FIN_WAIT1:
1650         case NES_CM_STATE_FIN_WAIT2:
1651         case NES_CM_STATE_MPAREQ_RCVD:
1652         case NES_CM_STATE_LAST_ACK:
1653         case NES_CM_STATE_CLOSING:
1654         case NES_CM_STATE_UNKNOWN:
1655         default:
1656                 drop_packet(skb);
1657                 break;
1658         }
1659 }
1660
1661 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1662         struct tcphdr *tcph)
1663 {
1664
1665         int ret;
1666         u32 inc_sequence;
1667         int optionsize;
1668
1669         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1670         skb_trim(skb, 0);
1671         inc_sequence = ntohl(tcph->seq);
1672         switch (cm_node->state) {
1673         case NES_CM_STATE_SYN_SENT:
1674                 cleanup_retrans_entry(cm_node);
1675                 /* active open */
1676                 if (check_syn(cm_node, tcph, skb))
1677                         return;
1678                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1679                 /* setup options */
1680                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1681                 if (ret) {
1682                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1683                                 cm_node);
1684                         break;
1685                 }
1686                 cleanup_retrans_entry(cm_node);
1687                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1688                 send_mpa_request(cm_node, skb);
1689                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1690                 break;
1691         case NES_CM_STATE_MPAREQ_RCVD:
1692                 /* passive open, so should not be here */
1693                 passive_open_err(cm_node, skb, 1);
1694                 break;
1695         case NES_CM_STATE_LISTENING:
1696                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1697                 cleanup_retrans_entry(cm_node);
1698                 cm_node->state = NES_CM_STATE_CLOSED;
1699                 send_reset(cm_node, skb);
1700                 break;
1701         case NES_CM_STATE_CLOSED:
1702                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1703                 cleanup_retrans_entry(cm_node);
1704                 add_ref_cm_node(cm_node);
1705                 send_reset(cm_node, skb);
1706                 break;
1707         case NES_CM_STATE_ESTABLISHED:
1708         case NES_CM_STATE_FIN_WAIT1:
1709         case NES_CM_STATE_FIN_WAIT2:
1710         case NES_CM_STATE_LAST_ACK:
1711         case NES_CM_STATE_TSA:
1712         case NES_CM_STATE_CLOSING:
1713         case NES_CM_STATE_UNKNOWN:
1714         case NES_CM_STATE_MPAREQ_SENT:
1715         default:
1716                 drop_packet(skb);
1717                 break;
1718         }
1719 }
1720
1721 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1722         struct tcphdr *tcph)
1723 {
1724         int datasize = 0;
1725         u32 inc_sequence;
1726         int ret = 0;
1727         int optionsize;
1728         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1729
1730         if (check_seq(cm_node, tcph, skb))
1731                 return -EINVAL;
1732
1733         skb_pull(skb, tcph->doff << 2);
1734         inc_sequence = ntohl(tcph->seq);
1735         datasize = skb->len;
1736         switch (cm_node->state) {
1737         case NES_CM_STATE_SYN_RCVD:
1738                 /* Passive OPEN */
1739                 cleanup_retrans_entry(cm_node);
1740                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1741                 if (ret)
1742                         break;
1743                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1744                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1745                 if (datasize) {
1746                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1747                         handle_rcv_mpa(cm_node, skb);
1748                 } else  /* rcvd ACK only */
1749                         dev_kfree_skb_any(skb);
1750                 break;
1751         case NES_CM_STATE_ESTABLISHED:
1752                 /* Passive OPEN */
1753                 cleanup_retrans_entry(cm_node);
1754                 if (datasize) {
1755                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1756                         handle_rcv_mpa(cm_node, skb);
1757                 } else
1758                         drop_packet(skb);
1759                 break;
1760         case NES_CM_STATE_MPAREQ_SENT:
1761                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1762                 if (datasize) {
1763                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1764                         handle_rcv_mpa(cm_node, skb);
1765                 } else  /* Could be just an ack pkt.. */
1766                         dev_kfree_skb_any(skb);
1767                 break;
1768         case NES_CM_STATE_LISTENING:
1769                 cleanup_retrans_entry(cm_node);
1770                 cm_node->state = NES_CM_STATE_CLOSED;
1771                 send_reset(cm_node, skb);
1772                 break;
1773         case NES_CM_STATE_CLOSED:
1774                 cleanup_retrans_entry(cm_node);
1775                 add_ref_cm_node(cm_node);
1776                 send_reset(cm_node, skb);
1777                 break;
1778         case NES_CM_STATE_LAST_ACK:
1779         case NES_CM_STATE_CLOSING:
1780                 cleanup_retrans_entry(cm_node);
1781                 cm_node->state = NES_CM_STATE_CLOSED;
1782                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1783                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1784                 drop_packet(skb);
1785                 break;
1786         case NES_CM_STATE_FIN_WAIT1:
1787                 cleanup_retrans_entry(cm_node);
1788                 drop_packet(skb);
1789                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1790                 break;
1791         case NES_CM_STATE_SYN_SENT:
1792         case NES_CM_STATE_FIN_WAIT2:
1793         case NES_CM_STATE_TSA:
1794         case NES_CM_STATE_MPAREQ_RCVD:
1795         case NES_CM_STATE_UNKNOWN:
1796         default:
1797                 cleanup_retrans_entry(cm_node);
1798                 drop_packet(skb);
1799                 break;
1800         }
1801         return ret;
1802 }
1803
1804
1805
1806 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1807         struct sk_buff *skb, int optionsize, int passive)
1808 {
1809         u8 *optionsloc = (u8 *)&tcph[1];
1810         if (optionsize) {
1811                 if (process_options(cm_node, optionsloc, optionsize,
1812                         (u32)tcph->syn)) {
1813                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
1814                                 __func__, cm_node);
1815                         if (passive)
1816                                 passive_open_err(cm_node, skb, 1);
1817                         else
1818                                 active_open_err(cm_node, skb, 1);
1819                         return 1;
1820                 }
1821         }
1822
1823         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1824                         cm_node->tcp_cntxt.snd_wscale;
1825
1826         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1827                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1828         return 0;
1829 }
1830
1831 /*
1832  * active_open_err() will send reset() if flag set..
1833  * It will also send ABORT event.
1834  */
1835
1836 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1837         int reset)
1838 {
1839         cleanup_retrans_entry(cm_node);
1840         if (reset) {
1841                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
1842                                 "state=%d\n", cm_node, cm_node->state);
1843                 add_ref_cm_node(cm_node);
1844                 send_reset(cm_node, skb);
1845         } else
1846                 dev_kfree_skb_any(skb);
1847
1848         cm_node->state = NES_CM_STATE_CLOSED;
1849         create_event(cm_node, NES_CM_EVENT_ABORTED);
1850 }
1851
1852 /*
1853  * passive_open_err() will either do a reset() or will free up the skb and
1854  * remove the cm_node.
1855  */
1856
1857 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1858         int reset)
1859 {
1860         cleanup_retrans_entry(cm_node);
1861         cm_node->state = NES_CM_STATE_CLOSED;
1862         if (reset) {
1863                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
1864                         "cm_node=%p state =%d\n", cm_node, cm_node->state);
1865                 send_reset(cm_node, skb);
1866         } else {
1867                 dev_kfree_skb_any(skb);
1868                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1869         }
1870 }
1871
1872 /*
1873  * free_retrans_entry() routines assumes that the retrans_list_lock has
1874  * been acquired before calling.
1875  */
1876 static void free_retrans_entry(struct nes_cm_node *cm_node)
1877 {
1878         struct nes_timer_entry *send_entry;
1879         send_entry = cm_node->send_entry;
1880         if (send_entry) {
1881                 cm_node->send_entry = NULL;
1882                 dev_kfree_skb_any(send_entry->skb);
1883                 kfree(send_entry);
1884                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1885         }
1886 }
1887
1888 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
1889 {
1890         unsigned long flags;
1891
1892         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1893         free_retrans_entry(cm_node);
1894         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1895 }
1896
1897 /**
1898  * process_packet
1899  * Returns skb if to be freed, else it will return NULL if already used..
1900  */
1901 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1902         struct nes_cm_core *cm_core)
1903 {
1904         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
1905         struct tcphdr *tcph = tcp_hdr(skb);
1906         u32     fin_set = 0;
1907         int ret = 0;
1908         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1909
1910         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1911                 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1912                 tcph->ack, tcph->rst, tcph->fin);
1913
1914         if (tcph->rst)
1915                 pkt_type = NES_PKT_TYPE_RST;
1916         else if (tcph->syn) {
1917                 pkt_type = NES_PKT_TYPE_SYN;
1918                 if (tcph->ack)
1919                         pkt_type = NES_PKT_TYPE_SYNACK;
1920         } else if (tcph->ack)
1921                 pkt_type = NES_PKT_TYPE_ACK;
1922         if (tcph->fin)
1923                 fin_set = 1;
1924
1925         switch (pkt_type) {
1926         case NES_PKT_TYPE_SYN:
1927                 handle_syn_pkt(cm_node, skb, tcph);
1928                 break;
1929         case NES_PKT_TYPE_SYNACK:
1930                 handle_synack_pkt(cm_node, skb, tcph);
1931                 break;
1932         case NES_PKT_TYPE_ACK:
1933                 ret = handle_ack_pkt(cm_node, skb, tcph);
1934                 if (fin_set && !ret)
1935                         handle_fin_pkt(cm_node);
1936                 break;
1937         case NES_PKT_TYPE_RST:
1938                 handle_rst_pkt(cm_node, skb, tcph);
1939                 break;
1940         default:
1941                 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
1942                         handle_fin_pkt(cm_node);
1943                 drop_packet(skb);
1944                 break;
1945         }
1946 }
1947
1948 /**
1949  * mini_cm_listen - create a listen node with params
1950  */
1951 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1952         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1953 {
1954         struct nes_cm_listener *listener;
1955         unsigned long flags;
1956
1957         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1958                 cm_info->loc_addr, cm_info->loc_port);
1959
1960         /* cannot have multiple matching listeners */
1961         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1962                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1963         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1964                 /* find automatically incs ref count ??? */
1965                 atomic_dec(&listener->ref_count);
1966                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1967                 return NULL;
1968         }
1969
1970         if (!listener) {
1971                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1972                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1973                 if (!listener) {
1974                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1975                         return NULL;
1976                 }
1977
1978                 listener->loc_addr = htonl(cm_info->loc_addr);
1979                 listener->loc_port = htons(cm_info->loc_port);
1980                 listener->reused_node = 0;
1981
1982                 atomic_set(&listener->ref_count, 1);
1983         }
1984         /* pasive case */
1985         /* find already inc'ed the ref count */
1986         else {
1987                 listener->reused_node = 1;
1988         }
1989
1990         listener->cm_id = cm_info->cm_id;
1991         atomic_set(&listener->pend_accepts_cnt, 0);
1992         listener->cm_core = cm_core;
1993         listener->nesvnic = nesvnic;
1994         atomic_inc(&cm_core->node_cnt);
1995
1996         listener->conn_type = cm_info->conn_type;
1997         listener->backlog = cm_info->backlog;
1998         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1999
2000         if (!listener->reused_node) {
2001                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2002                 list_add(&listener->list, &cm_core->listen_list.list);
2003                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2004                 atomic_inc(&cm_core->listen_node_cnt);
2005         }
2006
2007         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
2008                         " listener = %p, backlog = %d, cm_id = %p.\n",
2009                         cm_info->loc_addr, cm_info->loc_port,
2010                         listener, listener->backlog, listener->cm_id);
2011
2012         return listener;
2013 }
2014
2015
2016 /**
2017  * mini_cm_connect - make a connection node with params
2018  */
2019 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2020         struct nes_vnic *nesvnic, u16 private_data_len,
2021         void *private_data, struct nes_cm_info *cm_info)
2022 {
2023         int ret = 0;
2024         struct nes_cm_node *cm_node;
2025         struct nes_cm_listener *loopbackremotelistener;
2026         struct nes_cm_node *loopbackremotenode;
2027         struct nes_cm_info loopback_cm_info;
2028         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
2029         struct ietf_mpa_frame *mpa_frame = NULL;
2030
2031         /* create a CM connection node */
2032         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2033         if (!cm_node)
2034                 return NULL;
2035         mpa_frame = &cm_node->mpa_frame;
2036         memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
2037         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
2038         mpa_frame->rev =  IETF_MPA_VERSION;
2039         mpa_frame->priv_data_len = htons(private_data_len);
2040
2041         /* set our node side to client (active) side */
2042         cm_node->tcp_cntxt.client = 1;
2043         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2044
2045         if (cm_info->loc_addr == cm_info->rem_addr) {
2046                 loopbackremotelistener = find_listener(cm_core,
2047                                 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
2048                                 NES_CM_LISTENER_ACTIVE_STATE);
2049                 if (loopbackremotelistener == NULL) {
2050                         create_event(cm_node, NES_CM_EVENT_ABORTED);
2051                 } else {
2052                         loopback_cm_info = *cm_info;
2053                         loopback_cm_info.loc_port = cm_info->rem_port;
2054                         loopback_cm_info.rem_port = cm_info->loc_port;
2055                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2056                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
2057                                 &loopback_cm_info, loopbackremotelistener);
2058                         if (!loopbackremotenode) {
2059                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2060                                 return NULL;
2061                         }
2062                         atomic_inc(&cm_loopbacks);
2063                         loopbackremotenode->loopbackpartner = cm_node;
2064                         loopbackremotenode->tcp_cntxt.rcv_wscale =
2065                                 NES_CM_DEFAULT_RCV_WND_SCALE;
2066                         cm_node->loopbackpartner = loopbackremotenode;
2067                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2068                                 private_data_len);
2069                         loopbackremotenode->mpa_frame_size = private_data_len;
2070
2071                         /* we are done handling this state. */
2072                         /* set node to a TSA state */
2073                         cm_node->state = NES_CM_STATE_TSA;
2074                         cm_node->tcp_cntxt.rcv_nxt =
2075                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
2076                         loopbackremotenode->tcp_cntxt.rcv_nxt =
2077                                 cm_node->tcp_cntxt.loc_seq_num;
2078                         cm_node->tcp_cntxt.max_snd_wnd =
2079                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2080                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
2081                                 cm_node->tcp_cntxt.rcv_wnd;
2082                         cm_node->tcp_cntxt.snd_wnd =
2083                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2084                         loopbackremotenode->tcp_cntxt.snd_wnd =
2085                                 cm_node->tcp_cntxt.rcv_wnd;
2086                         cm_node->tcp_cntxt.snd_wscale =
2087                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
2088                         loopbackremotenode->tcp_cntxt.snd_wscale =
2089                                 cm_node->tcp_cntxt.rcv_wscale;
2090                         loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2091                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2092                 }
2093                 return cm_node;
2094         }
2095
2096         /* set our node side to client (active) side */
2097         cm_node->tcp_cntxt.client = 1;
2098         /* init our MPA frame ptr */
2099         memcpy(mpa_frame->priv_data, private_data, private_data_len);
2100
2101         cm_node->mpa_frame_size = mpa_frame_size;
2102
2103         /* send a syn and goto syn sent state */
2104         cm_node->state = NES_CM_STATE_SYN_SENT;
2105         ret = send_syn(cm_node, 0, NULL);
2106
2107         if (ret) {
2108                 /* error in sending the syn free up the cm_node struct */
2109                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2110                         "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2111                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2112                         cm_node->cm_id);
2113                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2114                 cm_node = NULL;
2115         }
2116
2117         if (cm_node)
2118                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2119                         "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2120                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2121                         cm_node->cm_id);
2122
2123         return cm_node;
2124 }
2125
2126
2127 /**
2128  * mini_cm_accept - accept a connection
2129  * This function is never called
2130  */
2131 static int mini_cm_accept(struct nes_cm_core *cm_core,
2132         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2133 {
2134         return 0;
2135 }
2136
2137
2138 /**
2139  * mini_cm_reject - reject and teardown a connection
2140  */
2141 static int mini_cm_reject(struct nes_cm_core *cm_core,
2142         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2143 {
2144         int ret = 0;
2145         int err = 0;
2146         int passive_state;
2147         struct nes_cm_event event;
2148         struct iw_cm_id *cm_id = cm_node->cm_id;
2149         struct nes_cm_node *loopback = cm_node->loopbackpartner;
2150
2151         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2152                 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2153
2154         if (cm_node->tcp_cntxt.client)
2155                 return ret;
2156         cleanup_retrans_entry(cm_node);
2157
2158         if (!loopback) {
2159                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2160                 if (passive_state == NES_SEND_RESET_EVENT) {
2161                         cm_node->state = NES_CM_STATE_CLOSED;
2162                         rem_ref_cm_node(cm_core, cm_node);
2163                 } else {
2164                         if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2165                                 rem_ref_cm_node(cm_core, cm_node);
2166                         } else {
2167                                 ret = send_mpa_reject(cm_node);
2168                                 if (ret) {
2169                                         cm_node->state = NES_CM_STATE_CLOSED;
2170                                         err = send_reset(cm_node, NULL);
2171                                         if (err)
2172                                                 WARN_ON(1);
2173                                 } else
2174                                         cm_id->add_ref(cm_id);
2175                         }
2176                 }
2177         } else {
2178                 cm_node->cm_id = NULL;
2179                 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2180                         rem_ref_cm_node(cm_core, cm_node);
2181                         rem_ref_cm_node(cm_core, loopback);
2182                 } else {
2183                         event.cm_node = loopback;
2184                         event.cm_info.rem_addr = loopback->rem_addr;
2185                         event.cm_info.loc_addr = loopback->loc_addr;
2186                         event.cm_info.rem_port = loopback->rem_port;
2187                         event.cm_info.loc_port = loopback->loc_port;
2188                         event.cm_info.cm_id = loopback->cm_id;
2189                         cm_event_mpa_reject(&event);
2190                         rem_ref_cm_node(cm_core, cm_node);
2191                         loopback->state = NES_CM_STATE_CLOSING;
2192
2193                         cm_id = loopback->cm_id;
2194                         rem_ref_cm_node(cm_core, loopback);
2195                         cm_id->rem_ref(cm_id);
2196                 }
2197         }
2198
2199         return ret;
2200 }
2201
2202
2203 /**
2204  * mini_cm_close
2205  */
2206 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2207 {
2208         int ret = 0;
2209
2210         if (!cm_core || !cm_node)
2211                 return -EINVAL;
2212
2213         switch (cm_node->state) {
2214         case NES_CM_STATE_SYN_RCVD:
2215         case NES_CM_STATE_SYN_SENT:
2216         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2217         case NES_CM_STATE_ESTABLISHED:
2218         case NES_CM_STATE_ACCEPTING:
2219         case NES_CM_STATE_MPAREQ_SENT:
2220         case NES_CM_STATE_MPAREQ_RCVD:
2221                 cleanup_retrans_entry(cm_node);
2222                 send_reset(cm_node, NULL);
2223                 break;
2224         case NES_CM_STATE_CLOSE_WAIT:
2225                 cm_node->state = NES_CM_STATE_LAST_ACK;
2226                 send_fin(cm_node, NULL);
2227                 break;
2228         case NES_CM_STATE_FIN_WAIT1:
2229         case NES_CM_STATE_FIN_WAIT2:
2230         case NES_CM_STATE_LAST_ACK:
2231         case NES_CM_STATE_TIME_WAIT:
2232         case NES_CM_STATE_CLOSING:
2233                 ret = -1;
2234                 break;
2235         case NES_CM_STATE_LISTENING:
2236                 cleanup_retrans_entry(cm_node);
2237                 send_reset(cm_node, NULL);
2238                 break;
2239         case NES_CM_STATE_MPAREJ_RCVD:
2240         case NES_CM_STATE_UNKNOWN:
2241         case NES_CM_STATE_INITED:
2242         case NES_CM_STATE_CLOSED:
2243         case NES_CM_STATE_LISTENER_DESTROYED:
2244                 ret = rem_ref_cm_node(cm_core, cm_node);
2245                 break;
2246         case NES_CM_STATE_TSA:
2247                 if (cm_node->send_entry)
2248                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2249                                 "send_entry=%p\n", cm_node->send_entry);
2250                 ret = rem_ref_cm_node(cm_core, cm_node);
2251                 break;
2252         }
2253         return ret;
2254 }
2255
2256
2257 /**
2258  * recv_pkt - recv an ETHERNET packet, and process it through CM
2259  * node state machine
2260  */
2261 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2262         struct nes_vnic *nesvnic, struct sk_buff *skb)
2263 {
2264         struct nes_cm_node *cm_node = NULL;
2265         struct nes_cm_listener *listener = NULL;
2266         struct iphdr *iph;
2267         struct tcphdr *tcph;
2268         struct nes_cm_info nfo;
2269         int skb_handled = 1;
2270         __be32 tmp_daddr, tmp_saddr;
2271
2272         if (!skb)
2273                 return 0;
2274         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2275                 return 0;
2276         }
2277
2278         iph = (struct iphdr *)skb->data;
2279         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2280
2281         nfo.loc_addr = ntohl(iph->daddr);
2282         nfo.loc_port = ntohs(tcph->dest);
2283         nfo.rem_addr = ntohl(iph->saddr);
2284         nfo.rem_port = ntohs(tcph->source);
2285
2286         tmp_daddr = cpu_to_be32(iph->daddr);
2287         tmp_saddr = cpu_to_be32(iph->saddr);
2288
2289         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2290                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2291
2292         do {
2293                 cm_node = find_node(cm_core,
2294                         nfo.rem_port, nfo.rem_addr,
2295                         nfo.loc_port, nfo.loc_addr);
2296
2297                 if (!cm_node) {
2298                         /* Only type of packet accepted are for */
2299                         /* the PASSIVE open (syn only) */
2300                         if ((!tcph->syn) || (tcph->ack)) {
2301                                 skb_handled = 0;
2302                                 break;
2303                         }
2304                         listener = find_listener(cm_core, nfo.loc_addr,
2305                                 nfo.loc_port,
2306                                 NES_CM_LISTENER_ACTIVE_STATE);
2307                         if (!listener) {
2308                                 nfo.cm_id = NULL;
2309                                 nfo.conn_type = 0;
2310                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2311                                 skb_handled = 0;
2312                                 break;
2313                         }
2314                         nfo.cm_id = listener->cm_id;
2315                         nfo.conn_type = listener->conn_type;
2316                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2317                                 listener);
2318                         if (!cm_node) {
2319                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2320                                         "node\n");
2321                                 cm_packets_dropped++;
2322                                 atomic_dec(&listener->ref_count);
2323                                 dev_kfree_skb_any(skb);
2324                                 break;
2325                         }
2326                         if (!tcph->rst && !tcph->fin) {
2327                                 cm_node->state = NES_CM_STATE_LISTENING;
2328                         } else {
2329                                 cm_packets_dropped++;
2330                                 rem_ref_cm_node(cm_core, cm_node);
2331                                 dev_kfree_skb_any(skb);
2332                                 break;
2333                         }
2334                         add_ref_cm_node(cm_node);
2335                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2336                         rem_ref_cm_node(cm_core, cm_node);
2337                         atomic_inc(&cm_accel_dropped_pkts);
2338                         dev_kfree_skb_any(skb);
2339                         break;
2340                 }
2341                 skb_reset_network_header(skb);
2342                 skb_set_transport_header(skb, sizeof(*tcph));
2343                 skb->len = ntohs(iph->tot_len);
2344                 process_packet(cm_node, skb, cm_core);
2345                 rem_ref_cm_node(cm_core, cm_node);
2346         } while (0);
2347         return skb_handled;
2348 }
2349
2350
2351 /**
2352  * nes_cm_alloc_core - allocate a top level instance of a cm core
2353  */
2354 static struct nes_cm_core *nes_cm_alloc_core(void)
2355 {
2356         struct nes_cm_core *cm_core;
2357
2358         /* setup the CM core */
2359         /* alloc top level core control structure */
2360         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2361         if (!cm_core)
2362                 return NULL;
2363
2364         INIT_LIST_HEAD(&cm_core->connected_nodes);
2365         init_timer(&cm_core->tcp_timer);
2366         cm_core->tcp_timer.function = nes_cm_timer_tick;
2367
2368         cm_core->mtu   = NES_CM_DEFAULT_MTU;
2369         cm_core->state = NES_CM_STATE_INITED;
2370         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2371
2372         atomic_set(&cm_core->events_posted, 0);
2373
2374         cm_core->api = &nes_cm_api;
2375
2376         spin_lock_init(&cm_core->ht_lock);
2377         spin_lock_init(&cm_core->listen_list_lock);
2378
2379         INIT_LIST_HEAD(&cm_core->listen_list.list);
2380
2381         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2382
2383         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2384         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2385         cm_core->post_event = nes_cm_post_event;
2386         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2387         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2388
2389         print_core(cm_core);
2390         return cm_core;
2391 }
2392
2393
2394 /**
2395  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2396  */
2397 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2398 {
2399         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2400
2401         if (!cm_core)
2402                 return -EINVAL;
2403
2404         barrier();
2405
2406         if (timer_pending(&cm_core->tcp_timer)) {
2407                 del_timer(&cm_core->tcp_timer);
2408         }
2409
2410         destroy_workqueue(cm_core->event_wq);
2411         destroy_workqueue(cm_core->disconn_wq);
2412         nes_debug(NES_DBG_CM, "\n");
2413         kfree(cm_core);
2414
2415         return 0;
2416 }
2417
2418
2419 /**
2420  * mini_cm_get
2421  */
2422 static int mini_cm_get(struct nes_cm_core *cm_core)
2423 {
2424         return cm_core->state;
2425 }
2426
2427
2428 /**
2429  * mini_cm_set
2430  */
2431 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2432 {
2433         int ret = 0;
2434
2435         switch (type) {
2436         case NES_CM_SET_PKT_SIZE:
2437                 cm_core->mtu = value;
2438                 break;
2439         case NES_CM_SET_FREE_PKT_Q_SIZE:
2440                 cm_core->free_tx_pkt_max = value;
2441                 break;
2442         default:
2443                 /* unknown set option */
2444                 ret = -EINVAL;
2445         }
2446
2447         return ret;
2448 }
2449
2450
2451 /**
2452  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2453  * successfully exchanged when this is called
2454  */
2455 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2456 {
2457         int ret = 0;
2458
2459         if (!nesqp)
2460                 return -EINVAL;
2461
2462         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2463                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2464                         NES_QPCONTEXT_MISC_DROS);
2465
2466         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2467                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2468
2469         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2470
2471         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2472
2473         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2474                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2475
2476         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2477                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2478                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2479
2480         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2481                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2482                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2483
2484         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2485         nesqp->nesqp_context->ts_recent = 0;
2486         nesqp->nesqp_context->ts_age = 0;
2487         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2488         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2489         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2490         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2491                         cm_node->tcp_cntxt.rcv_wscale);
2492         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2493         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2494         nesqp->nesqp_context->srtt = 0;
2495         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2496         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2497         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2498         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2499         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2500         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2501
2502         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2503                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2504                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2505                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2506                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2507                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2508                         le32_to_cpu(nesqp->nesqp_context->misc));
2509         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2510         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2511         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2512
2513         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2514         cm_node->state = NES_CM_STATE_TSA;
2515
2516         return ret;
2517 }
2518
2519
2520 /**
2521  * nes_cm_disconn
2522  */
2523 int nes_cm_disconn(struct nes_qp *nesqp)
2524 {
2525         struct disconn_work *work;
2526
2527         work = kzalloc(sizeof *work, GFP_ATOMIC);
2528         if (!work)
2529                 return -ENOMEM; /* Timer will clean up */
2530
2531         nes_add_ref(&nesqp->ibqp);
2532         work->nesqp = nesqp;
2533         INIT_WORK(&work->work, nes_disconnect_worker);
2534         queue_work(g_cm_core->disconn_wq, &work->work);
2535         return 0;
2536 }
2537
2538
2539 /**
2540  * nes_disconnect_worker
2541  */
2542 static void nes_disconnect_worker(struct work_struct *work)
2543 {
2544         struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2545         struct nes_qp *nesqp = dwork->nesqp;
2546
2547         kfree(dwork);
2548         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2549                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2550         nes_cm_disconn_true(nesqp);
2551         nes_rem_ref(&nesqp->ibqp);
2552 }
2553
2554
2555 /**
2556  * nes_cm_disconn_true
2557  */
2558 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2559 {
2560         unsigned long flags;
2561         int ret = 0;
2562         struct iw_cm_id *cm_id;
2563         struct iw_cm_event cm_event;
2564         struct nes_vnic *nesvnic;
2565         u16 last_ae;
2566         u8 original_hw_tcp_state;
2567         u8 original_ibqp_state;
2568         enum iw_cm_event_status disconn_status = IW_CM_EVENT_STATUS_OK;
2569         int issue_disconn = 0;
2570         int issue_close = 0;
2571         int issue_flush = 0;
2572         u32 flush_q = NES_CQP_FLUSH_RQ;
2573         struct ib_event ibevent;
2574
2575         if (!nesqp) {
2576                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2577                 return -1;
2578         }
2579
2580         spin_lock_irqsave(&nesqp->lock, flags);
2581         cm_id = nesqp->cm_id;
2582         /* make sure we havent already closed this connection */
2583         if (!cm_id) {
2584                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2585                                 nesqp->hwqp.qp_id);
2586                 spin_unlock_irqrestore(&nesqp->lock, flags);
2587                 return -1;
2588         }
2589
2590         nesvnic = to_nesvnic(nesqp->ibqp.device);
2591         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2592
2593         original_hw_tcp_state = nesqp->hw_tcp_state;
2594         original_ibqp_state   = nesqp->ibqp_state;
2595         last_ae = nesqp->last_aeq;
2596
2597         if (nesqp->term_flags) {
2598                 issue_disconn = 1;
2599                 issue_close = 1;
2600                 nesqp->cm_id = NULL;
2601                 if (nesqp->flush_issued == 0) {
2602                         nesqp->flush_issued = 1;
2603                         issue_flush = 1;
2604                 }
2605         } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2606                         ((original_ibqp_state == IB_QPS_RTS) &&
2607                         (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2608                 issue_disconn = 1;
2609                 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2610                         disconn_status = IW_CM_EVENT_STATUS_RESET;
2611         }
2612
2613         if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2614                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2615                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2616                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2617                 issue_close = 1;
2618                 nesqp->cm_id = NULL;
2619                 if (nesqp->flush_issued == 0) {
2620                         nesqp->flush_issued = 1;
2621                         issue_flush = 1;
2622                 }
2623         }
2624
2625         spin_unlock_irqrestore(&nesqp->lock, flags);
2626
2627         if ((issue_flush) && (nesqp->destroyed == 0)) {
2628                 /* Flush the queue(s) */
2629                 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2630                         flush_q |= NES_CQP_FLUSH_SQ;
2631                 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2632
2633                 if (nesqp->term_flags) {
2634                         ibevent.device = nesqp->ibqp.device;
2635                         ibevent.event = nesqp->terminate_eventtype;
2636                         ibevent.element.qp = &nesqp->ibqp;
2637                         nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2638                 }
2639         }
2640
2641         if ((cm_id) && (cm_id->event_handler)) {
2642                 if (issue_disconn) {
2643                         atomic_inc(&cm_disconnects);
2644                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2645                         cm_event.status = disconn_status;
2646                         cm_event.local_addr = cm_id->local_addr;
2647                         cm_event.remote_addr = cm_id->remote_addr;
2648                         cm_event.private_data = NULL;
2649                         cm_event.private_data_len = 0;
2650
2651                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2652                                 " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2653                                 "cm_id = %p, refcount = %u.\n",
2654                                 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2655                                 nesqp->hwqp.sq_tail, cm_id,
2656                                 atomic_read(&nesqp->refcount));
2657
2658                         ret = cm_id->event_handler(cm_id, &cm_event);
2659                         if (ret)
2660                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2661                                         "returned, ret=%d\n", ret);
2662                 }
2663
2664                 if (issue_close) {
2665                         atomic_inc(&cm_closes);
2666                         nes_disconnect(nesqp, 1);
2667
2668                         cm_id->provider_data = nesqp;
2669                         /* Send up the close complete event */
2670                         cm_event.event = IW_CM_EVENT_CLOSE;
2671                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2672                         cm_event.provider_data = cm_id->provider_data;
2673                         cm_event.local_addr = cm_id->local_addr;
2674                         cm_event.remote_addr = cm_id->remote_addr;
2675                         cm_event.private_data = NULL;
2676                         cm_event.private_data_len = 0;
2677
2678                         ret = cm_id->event_handler(cm_id, &cm_event);
2679                         if (ret) {
2680                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2681                         }
2682
2683                         cm_id->rem_ref(cm_id);
2684                 }
2685         }
2686
2687         return 0;
2688 }
2689
2690
2691 /**
2692  * nes_disconnect
2693  */
2694 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2695 {
2696         int ret = 0;
2697         struct nes_vnic *nesvnic;
2698         struct nes_device *nesdev;
2699         struct nes_ib_device *nesibdev;
2700
2701         nesvnic = to_nesvnic(nesqp->ibqp.device);
2702         if (!nesvnic)
2703                 return -EINVAL;
2704
2705         nesdev = nesvnic->nesdev;
2706         nesibdev = nesvnic->nesibdev;
2707
2708         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2709                         netdev_refcnt_read(nesvnic->netdev));
2710
2711         if (nesqp->active_conn) {
2712
2713                 /* indicate this connection is NOT active */
2714                 nesqp->active_conn = 0;
2715         } else {
2716                 /* Need to free the Last Streaming Mode Message */
2717                 if (nesqp->ietf_frame) {
2718                         if (nesqp->lsmm_mr)
2719                                 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2720                         pci_free_consistent(nesdev->pcidev,
2721                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2722                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2723                 }
2724         }
2725
2726         /* close the CM node down if it is still active */
2727         if (nesqp->cm_node) {
2728                 nes_debug(NES_DBG_CM, "Call close API\n");
2729
2730                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2731         }
2732
2733         return ret;
2734 }
2735
2736
2737 /**
2738  * nes_accept
2739  */
2740 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2741 {
2742         u64 u64temp;
2743         struct ib_qp *ibqp;
2744         struct nes_qp *nesqp;
2745         struct nes_vnic *nesvnic;
2746         struct nes_device *nesdev;
2747         struct nes_cm_node *cm_node;
2748         struct nes_adapter *adapter;
2749         struct ib_qp_attr attr;
2750         struct iw_cm_event cm_event;
2751         struct nes_hw_qp_wqe *wqe;
2752         struct nes_v4_quad nes_quad;
2753         u32 crc_value;
2754         int ret;
2755         int passive_state;
2756         struct nes_ib_device *nesibdev;
2757         struct ib_mr *ibmr = NULL;
2758         struct ib_phys_buf ibphysbuf;
2759         struct nes_pd *nespd;
2760         u64 tagged_offset;
2761
2762         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2763         if (!ibqp)
2764                 return -EINVAL;
2765
2766         /* get all our handles */
2767         nesqp = to_nesqp(ibqp);
2768         nesvnic = to_nesvnic(nesqp->ibqp.device);
2769         nesdev = nesvnic->nesdev;
2770         adapter = nesdev->nesadapter;
2771
2772         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2773         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2774                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2775                 nesvnic->netdev->name);
2776
2777         if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
2778                 if (cm_node->loopbackpartner)
2779                         rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
2780                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2781                 return -EINVAL;
2782         }
2783
2784         passive_state = atomic_add_return(1, &cm_node->passive_state);
2785         if (passive_state == NES_SEND_RESET_EVENT) {
2786                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2787                 return -ECONNRESET;
2788         }
2789
2790         /* associate the node with the QP */
2791         nesqp->cm_node = (void *)cm_node;
2792         cm_node->nesqp = nesqp;
2793
2794         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
2795                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2796         atomic_inc(&cm_accepts);
2797
2798         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2799                         netdev_refcnt_read(nesvnic->netdev));
2800
2801         /* allocate the ietf frame and space for private data */
2802         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2803                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2804                 &nesqp->ietf_frame_pbase);
2805
2806         if (!nesqp->ietf_frame) {
2807                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
2808                         "data\n");
2809                 return -ENOMEM;
2810         }
2811
2812
2813         /* setup the MPA frame */
2814         nesqp->private_data_len = conn_param->private_data_len;
2815         memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2816
2817         memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2818                         conn_param->private_data_len);
2819
2820         nesqp->ietf_frame->priv_data_len =
2821                 cpu_to_be16(conn_param->private_data_len);
2822         nesqp->ietf_frame->rev = mpa_version;
2823         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2824
2825         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2826         wqe = &nesqp->hwqp.sq_vbase[0];
2827
2828         if (cm_id->remote_addr.sin_addr.s_addr !=
2829                         cm_id->local_addr.sin_addr.s_addr) {
2830                 u64temp = (unsigned long)nesqp;
2831                 nesibdev = nesvnic->nesibdev;
2832                 nespd = nesqp->nespd;
2833                 ibphysbuf.addr = nesqp->ietf_frame_pbase;
2834                 ibphysbuf.size = conn_param->private_data_len +
2835                                         sizeof(struct ietf_mpa_frame);
2836                 tagged_offset = (u64)(unsigned long)nesqp->ietf_frame;
2837                 ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
2838                                                 &ibphysbuf, 1,
2839                                                 IB_ACCESS_LOCAL_WRITE,
2840                                                 &tagged_offset);
2841                 if (!ibmr) {
2842                         nes_debug(NES_DBG_CM, "Unable to register memory region"
2843                                         "for lSMM for cm_node = %p \n",
2844                                         cm_node);
2845                         pci_free_consistent(nesdev->pcidev,
2846                                 nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2847                                 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2848                         return -ENOMEM;
2849                 }
2850
2851                 ibmr->pd = &nespd->ibpd;
2852                 ibmr->device = nespd->ibpd.device;
2853                 nesqp->lsmm_mr = ibmr;
2854
2855                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2856                 set_wqe_64bit_value(wqe->wqe_words,
2857                         NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2858                         u64temp);
2859                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2860                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2861                         NES_IWARP_SQ_WQE_WRPDU);
2862                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2863                         cpu_to_le32(conn_param->private_data_len +
2864                         sizeof(struct ietf_mpa_frame));
2865                 set_wqe_64bit_value(wqe->wqe_words,
2866                                         NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
2867                                         (u64)(unsigned long)nesqp->ietf_frame);
2868                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2869                         cpu_to_le32(conn_param->private_data_len +
2870                         sizeof(struct ietf_mpa_frame));
2871                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
2872                 if (nesqp->sq_kmapped) {
2873                         nesqp->sq_kmapped = 0;
2874                         kunmap(nesqp->page);
2875                 }
2876
2877                 nesqp->nesqp_context->ird_ord_sizes |=
2878                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2879                         NES_QPCONTEXT_ORDIRD_WRPDU);
2880         } else {
2881                 nesqp->nesqp_context->ird_ord_sizes |=
2882                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
2883         }
2884         nesqp->skip_lsmm = 1;
2885
2886
2887         /* Cache the cm_id in the qp */
2888         nesqp->cm_id = cm_id;
2889         cm_node->cm_id = cm_id;
2890
2891         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2892         cm_id->provider_data = nesqp;
2893         nesqp->active_conn   = 0;
2894
2895         if (cm_node->state == NES_CM_STATE_TSA)
2896                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2897                         cm_node);
2898
2899         nes_cm_init_tsa_conn(nesqp, cm_node);
2900
2901         nesqp->nesqp_context->tcpPorts[0] =
2902                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2903         nesqp->nesqp_context->tcpPorts[1] =
2904                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2905
2906         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2907                 nesqp->nesqp_context->ip0 =
2908                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2909         else
2910                 nesqp->nesqp_context->ip0 =
2911                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2912
2913         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2914                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2915                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2916
2917         nesqp->nesqp_context->arp_index_vlan |=
2918                 cpu_to_le32(nes_arp_table(nesdev,
2919                         le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2920                         NES_ARP_RESOLVE) << 16);
2921
2922         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2923                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2924
2925         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2926
2927         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2928                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2929         nesqp->nesqp_context->ird_ord_sizes |=
2930                 cpu_to_le32((u32)conn_param->ord);
2931
2932         memset(&nes_quad, 0, sizeof(nes_quad));
2933         nes_quad.DstIpAdrIndex =
2934                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2935         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2936                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2937         else
2938                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2939         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2940         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2941
2942         /* Produce hash key */
2943         crc_value = get_crc_value(&nes_quad);
2944         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2945         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2946                 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2947
2948         nesqp->hte_index &= adapter->hte_index_mask;
2949         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2950
2951         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2952
2953         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2954                         "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2955                         "private data length=%zu.\n", nesqp->hwqp.qp_id,
2956                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2957                         ntohs(cm_id->remote_addr.sin_port),
2958                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2959                         ntohs(cm_id->local_addr.sin_port),
2960                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2961                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2962                         conn_param->private_data_len +
2963                         sizeof(struct ietf_mpa_frame));
2964
2965
2966         /* notify OF layer that accept event was successful */
2967         cm_id->add_ref(cm_id);
2968         nes_add_ref(&nesqp->ibqp);
2969
2970         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2971         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2972         cm_event.provider_data = (void *)nesqp;
2973         cm_event.local_addr = cm_id->local_addr;
2974         cm_event.remote_addr = cm_id->remote_addr;
2975         cm_event.private_data = NULL;
2976         cm_event.private_data_len = 0;
2977         ret = cm_id->event_handler(cm_id, &cm_event);
2978         attr.qp_state = IB_QPS_RTS;
2979         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2980         if (cm_node->loopbackpartner) {
2981                 cm_node->loopbackpartner->mpa_frame_size =
2982                         nesqp->private_data_len;
2983                 /* copy entire MPA frame to our cm_node's frame */
2984                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2985                         nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2986                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2987         }
2988         if (ret)
2989                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2990                         "ret=%d\n", __func__, __LINE__, ret);
2991
2992         return 0;
2993 }
2994
2995
2996 /**
2997  * nes_reject
2998  */
2999 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
3000 {
3001         struct nes_cm_node *cm_node;
3002         struct nes_cm_node *loopback;
3003
3004         struct nes_cm_core *cm_core;
3005
3006         atomic_inc(&cm_rejects);
3007         cm_node = (struct nes_cm_node *) cm_id->provider_data;
3008         loopback = cm_node->loopbackpartner;
3009         cm_core = cm_node->cm_core;
3010         cm_node->cm_id = cm_id;
3011         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
3012
3013         if (cm_node->mpa_frame_size > MAX_CM_BUFFER)
3014                 return -EINVAL;
3015
3016         memcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
3017         if (loopback) {
3018                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3019                 loopback->mpa_frame.priv_data_len = pdata_len;
3020                 loopback->mpa_frame_size = sizeof(struct ietf_mpa_frame) +
3021                                 pdata_len;
3022         } else {
3023                 memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
3024                 cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
3025         }
3026
3027         cm_node->mpa_frame.rev = mpa_version;
3028         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
3029
3030         return cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
3031 }
3032
3033
3034 /**
3035  * nes_connect
3036  * setup and launch cm connect node
3037  */
3038 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3039 {
3040         struct ib_qp *ibqp;
3041         struct nes_qp *nesqp;
3042         struct nes_vnic *nesvnic;
3043         struct nes_device *nesdev;
3044         struct nes_cm_node *cm_node;
3045         struct nes_cm_info cm_info;
3046         int apbvt_set = 0;
3047
3048         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3049         if (!ibqp)
3050                 return -EINVAL;
3051         nesqp = to_nesqp(ibqp);
3052         if (!nesqp)
3053                 return -EINVAL;
3054         nesvnic = to_nesvnic(nesqp->ibqp.device);
3055         if (!nesvnic)
3056                 return -EINVAL;
3057         nesdev  = nesvnic->nesdev;
3058         if (!nesdev)
3059                 return -EINVAL;
3060
3061         if (!(cm_id->local_addr.sin_port) || !(cm_id->remote_addr.sin_port))
3062                 return -EINVAL;
3063
3064         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3065                 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3066                 ntohl(nesvnic->local_ipaddr),
3067                 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3068                 ntohs(cm_id->remote_addr.sin_port),
3069                 ntohl(cm_id->local_addr.sin_addr.s_addr),
3070                 ntohs(cm_id->local_addr.sin_port));
3071
3072         atomic_inc(&cm_connects);
3073         nesqp->active_conn = 1;
3074
3075         /* cache the cm_id in the qp */
3076         nesqp->cm_id = cm_id;
3077
3078         cm_id->provider_data = nesqp;
3079
3080         nesqp->private_data_len = conn_param->private_data_len;
3081         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
3082         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3083         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3084                 conn_param->private_data_len);
3085
3086         if (cm_id->local_addr.sin_addr.s_addr !=
3087                 cm_id->remote_addr.sin_addr.s_addr) {
3088                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3089                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3090                 apbvt_set = 1;
3091         }
3092
3093         /* set up the connection params for the node */
3094         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3095         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3096         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3097         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3098         cm_info.cm_id = cm_id;
3099         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3100
3101         cm_id->add_ref(cm_id);
3102
3103         /* create a connect CM node connection */
3104         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3105                 conn_param->private_data_len, (void *)conn_param->private_data,
3106                 &cm_info);
3107         if (!cm_node) {
3108                 if (apbvt_set)
3109                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3110                                 PCI_FUNC(nesdev->pcidev->devfn),
3111                                 NES_MANAGE_APBVT_DEL);
3112
3113                 cm_id->rem_ref(cm_id);
3114                 return -ENOMEM;
3115         }
3116
3117         cm_node->apbvt_set = apbvt_set;
3118         nesqp->cm_node = cm_node;
3119         cm_node->nesqp = nesqp;
3120         nes_add_ref(&nesqp->ibqp);
3121
3122         return 0;
3123 }
3124
3125
3126 /**
3127  * nes_create_listen
3128  */
3129 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3130 {
3131         struct nes_vnic *nesvnic;
3132         struct nes_cm_listener *cm_node;
3133         struct nes_cm_info cm_info;
3134         int err;
3135
3136         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3137                         cm_id, ntohs(cm_id->local_addr.sin_port));
3138
3139         nesvnic = to_nesvnic(cm_id->device);
3140         if (!nesvnic)
3141                 return -EINVAL;
3142
3143         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3144                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3145
3146         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3147                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3148
3149         /* setup listen params in our api call struct */
3150         cm_info.loc_addr = nesvnic->local_ipaddr;
3151         cm_info.loc_port = cm_id->local_addr.sin_port;
3152         cm_info.backlog = backlog;
3153         cm_info.cm_id = cm_id;
3154
3155         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3156
3157
3158         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3159         if (!cm_node) {
3160                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3161                                 __func__, __LINE__);
3162                 return -ENOMEM;
3163         }
3164
3165         cm_id->provider_data = cm_node;
3166
3167         if (!cm_node->reused_node) {
3168                 err = nes_manage_apbvt(nesvnic,
3169                         ntohs(cm_id->local_addr.sin_port),
3170                         PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3171                         NES_MANAGE_APBVT_ADD);
3172                 if (err) {
3173                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3174                                 err);
3175                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3176                         return err;
3177                 }
3178                 atomic_inc(&cm_listens_created);
3179         }
3180
3181         cm_id->add_ref(cm_id);
3182         cm_id->provider_data = (void *)cm_node;
3183
3184
3185         return 0;
3186 }
3187
3188
3189 /**
3190  * nes_destroy_listen
3191  */
3192 int nes_destroy_listen(struct iw_cm_id *cm_id)
3193 {
3194         if (cm_id->provider_data)
3195                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3196         else
3197                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3198
3199         cm_id->rem_ref(cm_id);
3200
3201         return 0;
3202 }
3203
3204
3205 /**
3206  * nes_cm_recv
3207  */
3208 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3209 {
3210         int rc = 0;
3211         cm_packets_received++;
3212         if ((g_cm_core) && (g_cm_core->api)) {
3213                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3214         } else {
3215                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3216                                 " cm is not setup properly.\n");
3217         }
3218
3219         return rc;
3220 }
3221
3222
3223 /**
3224  * nes_cm_start
3225  * Start and init a cm core module
3226  */
3227 int nes_cm_start(void)
3228 {
3229         nes_debug(NES_DBG_CM, "\n");
3230         /* create the primary CM core, pass this handle to subsequent core inits */
3231         g_cm_core = nes_cm_alloc_core();
3232         if (g_cm_core) {
3233                 return 0;
3234         } else {
3235                 return -ENOMEM;
3236         }
3237 }
3238
3239
3240 /**
3241  * nes_cm_stop
3242  * stop and dealloc all cm core instances
3243  */
3244 int nes_cm_stop(void)
3245 {
3246         g_cm_core->api->destroy_cm_core(g_cm_core);
3247         return 0;
3248 }
3249
3250
3251 /**
3252  * cm_event_connected
3253  * handle a connected event, setup QPs and HW
3254  */
3255 static void cm_event_connected(struct nes_cm_event *event)
3256 {
3257         u64 u64temp;
3258         struct nes_qp *nesqp;
3259         struct nes_vnic *nesvnic;
3260         struct nes_device *nesdev;
3261         struct nes_cm_node *cm_node;
3262         struct nes_adapter *nesadapter;
3263         struct ib_qp_attr attr;
3264         struct iw_cm_id *cm_id;
3265         struct iw_cm_event cm_event;
3266         struct nes_hw_qp_wqe *wqe;
3267         struct nes_v4_quad nes_quad;
3268         u32 crc_value;
3269         int ret;
3270
3271         /* get all our handles */
3272         cm_node = event->cm_node;
3273         cm_id = cm_node->cm_id;
3274         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3275         nesqp = (struct nes_qp *)cm_id->provider_data;
3276         nesvnic = to_nesvnic(nesqp->ibqp.device);
3277         nesdev = nesvnic->nesdev;
3278         nesadapter = nesdev->nesadapter;
3279
3280         if (nesqp->destroyed) {
3281                 return;
3282         }
3283         atomic_inc(&cm_connecteds);
3284         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3285                         " local port 0x%04X. jiffies = %lu.\n",
3286                         nesqp->hwqp.qp_id,
3287                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
3288                         ntohs(cm_id->remote_addr.sin_port),
3289                         ntohs(cm_id->local_addr.sin_port),
3290                         jiffies);
3291
3292         nes_cm_init_tsa_conn(nesqp, cm_node);
3293
3294         /* set the QP tsa context */
3295         nesqp->nesqp_context->tcpPorts[0] =
3296                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3297         nesqp->nesqp_context->tcpPorts[1] =
3298                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3299         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3300                 nesqp->nesqp_context->ip0 =
3301                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3302         else
3303                 nesqp->nesqp_context->ip0 =
3304                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3305
3306         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3307                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3308                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3309         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3310                         nes_arp_table(nesdev,
3311                         le32_to_cpu(nesqp->nesqp_context->ip0),
3312                         NULL, NES_ARP_RESOLVE) << 16);
3313         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3314                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3315         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3316         nesqp->nesqp_context->ird_ord_sizes |=
3317                         cpu_to_le32((u32)1 <<
3318                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3319
3320         /* Adjust tail for not having a LSMM */
3321         nesqp->hwqp.sq_tail = 1;
3322
3323 #if defined(NES_SEND_FIRST_WRITE)
3324         if (cm_node->send_write0) {
3325                 nes_debug(NES_DBG_CM, "Sending first write.\n");
3326                 wqe = &nesqp->hwqp.sq_vbase[0];
3327                 u64temp = (unsigned long)nesqp;
3328                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3329                 set_wqe_64bit_value(wqe->wqe_words,
3330                                 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3331                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3332                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3333                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3334                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3335                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3336                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3337                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3338
3339                 if (nesqp->sq_kmapped) {
3340                         nesqp->sq_kmapped = 0;
3341                         kunmap(nesqp->page);
3342                 }
3343
3344                 /* use the reserved spot on the WQ for the extra first WQE */
3345                 nesqp->nesqp_context->ird_ord_sizes &=
3346                         cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3347                                                 NES_QPCONTEXT_ORDIRD_WRPDU |
3348                                                 NES_QPCONTEXT_ORDIRD_ALSMM));
3349                 nesqp->skip_lsmm = 1;
3350                 nesqp->hwqp.sq_tail = 0;
3351                 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3352                                 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3353         }
3354 #endif
3355
3356         memset(&nes_quad, 0, sizeof(nes_quad));
3357
3358         nes_quad.DstIpAdrIndex =
3359                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3360         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3361                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3362         else
3363                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3364         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3365         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3366
3367         /* Produce hash key */
3368         crc_value = get_crc_value(&nes_quad);
3369         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3370         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3371                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3372
3373         nesqp->hte_index &= nesadapter->hte_index_mask;
3374         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3375
3376         nesqp->ietf_frame = &cm_node->mpa_frame;
3377         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3378         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3379
3380         /* notify OF layer we successfully created the requested connection */
3381         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3382         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
3383         cm_event.provider_data = cm_id->provider_data;
3384         cm_event.local_addr.sin_family = AF_INET;
3385         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3386         cm_event.remote_addr = cm_id->remote_addr;
3387
3388         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3389         cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3390
3391         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3392         ret = cm_id->event_handler(cm_id, &cm_event);
3393         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3394
3395         if (ret)
3396                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3397                         "ret=%d\n", __func__, __LINE__, ret);
3398         attr.qp_state = IB_QPS_RTS;
3399         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3400
3401         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3402                 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3403
3404         return;
3405 }
3406
3407
3408 /**
3409  * cm_event_connect_error
3410  */
3411 static void cm_event_connect_error(struct nes_cm_event *event)
3412 {
3413         struct nes_qp *nesqp;
3414         struct iw_cm_id *cm_id;
3415         struct iw_cm_event cm_event;
3416         /* struct nes_cm_info cm_info; */
3417         int ret;
3418
3419         if (!event->cm_node)
3420                 return;
3421
3422         cm_id = event->cm_node->cm_id;
3423         if (!cm_id) {
3424                 return;
3425         }
3426
3427         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3428         nesqp = cm_id->provider_data;
3429
3430         if (!nesqp) {
3431                 return;
3432         }
3433
3434         /* notify OF layer about this connection error event */
3435         /* cm_id->rem_ref(cm_id); */
3436         nesqp->cm_id = NULL;
3437         cm_id->provider_data = NULL;
3438         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3439         cm_event.status = -ECONNRESET;
3440         cm_event.provider_data = cm_id->provider_data;
3441         cm_event.local_addr = cm_id->local_addr;
3442         cm_event.remote_addr = cm_id->remote_addr;
3443         cm_event.private_data = NULL;
3444         cm_event.private_data_len = 0;
3445
3446         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3447                 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3448                 cm_event.remote_addr.sin_addr.s_addr);
3449
3450         ret = cm_id->event_handler(cm_id, &cm_event);
3451         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3452         if (ret)
3453                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3454                         "ret=%d\n", __func__, __LINE__, ret);
3455         cm_id->rem_ref(cm_id);
3456
3457         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3458         return;
3459 }
3460
3461
3462 /**
3463  * cm_event_reset
3464  */
3465 static void cm_event_reset(struct nes_cm_event *event)
3466 {
3467         struct nes_qp *nesqp;
3468         struct iw_cm_id *cm_id;
3469         struct iw_cm_event cm_event;
3470         /* struct nes_cm_info cm_info; */
3471         int ret;
3472
3473         if (!event->cm_node)
3474                 return;
3475
3476         if (!event->cm_node->cm_id)
3477                 return;
3478
3479         cm_id = event->cm_node->cm_id;
3480
3481         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3482         nesqp = cm_id->provider_data;
3483         if (!nesqp)
3484                 return;
3485
3486         nesqp->cm_id = NULL;
3487         /* cm_id->provider_data = NULL; */
3488         cm_event.event = IW_CM_EVENT_DISCONNECT;
3489         cm_event.status = IW_CM_EVENT_STATUS_RESET;
3490         cm_event.provider_data = cm_id->provider_data;
3491         cm_event.local_addr = cm_id->local_addr;
3492         cm_event.remote_addr = cm_id->remote_addr;
3493         cm_event.private_data = NULL;
3494         cm_event.private_data_len = 0;
3495
3496         cm_id->add_ref(cm_id);
3497         ret = cm_id->event_handler(cm_id, &cm_event);
3498         atomic_inc(&cm_closes);
3499         cm_event.event = IW_CM_EVENT_CLOSE;
3500         cm_event.status = IW_CM_EVENT_STATUS_OK;
3501         cm_event.provider_data = cm_id->provider_data;
3502         cm_event.local_addr = cm_id->local_addr;
3503         cm_event.remote_addr = cm_id->remote_addr;
3504         cm_event.private_data = NULL;
3505         cm_event.private_data_len = 0;
3506         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3507         ret = cm_id->event_handler(cm_id, &cm_event);
3508
3509         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3510
3511
3512         /* notify OF layer about this connection error event */
3513         cm_id->rem_ref(cm_id);
3514
3515         return;
3516 }
3517
3518
3519 /**
3520  * cm_event_mpa_req
3521  */
3522 static void cm_event_mpa_req(struct nes_cm_event *event)
3523 {
3524         struct iw_cm_id   *cm_id;
3525         struct iw_cm_event cm_event;
3526         int ret;
3527         struct nes_cm_node *cm_node;
3528
3529         cm_node = event->cm_node;
3530         if (!cm_node)
3531                 return;
3532         cm_id = cm_node->cm_id;
3533
3534         atomic_inc(&cm_connect_reqs);
3535         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3536                         cm_node, cm_id, jiffies);
3537
3538         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3539         cm_event.status = IW_CM_EVENT_STATUS_OK;
3540         cm_event.provider_data = (void *)cm_node;
3541
3542         cm_event.local_addr.sin_family = AF_INET;
3543         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3544         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3545
3546         cm_event.remote_addr.sin_family = AF_INET;
3547         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3548         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3549         cm_event.private_data = cm_node->mpa_frame_buf;
3550         cm_event.private_data_len  = (u8) cm_node->mpa_frame_size;
3551
3552         ret = cm_id->event_handler(cm_id, &cm_event);
3553         if (ret)
3554                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3555                                 __func__, __LINE__, ret);
3556         return;
3557 }
3558
3559
3560 static void cm_event_mpa_reject(struct nes_cm_event *event)
3561 {
3562         struct iw_cm_id   *cm_id;
3563         struct iw_cm_event cm_event;
3564         struct nes_cm_node *cm_node;
3565         int ret;
3566
3567         cm_node = event->cm_node;
3568         if (!cm_node)
3569                 return;
3570         cm_id = cm_node->cm_id;
3571
3572         atomic_inc(&cm_connect_reqs);
3573         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3574                         cm_node, cm_id, jiffies);
3575
3576         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3577         cm_event.status = -ECONNREFUSED;
3578         cm_event.provider_data = cm_id->provider_data;
3579
3580         cm_event.local_addr.sin_family = AF_INET;
3581         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3582         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3583
3584         cm_event.remote_addr.sin_family = AF_INET;
3585         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3586         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3587
3588         cm_event.private_data = cm_node->mpa_frame_buf;
3589         cm_event.private_data_len = (u8) cm_node->mpa_frame_size;
3590
3591         nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3592                         "remove_addr=%08x\n",
3593                         cm_event.local_addr.sin_addr.s_addr,
3594                         cm_event.remote_addr.sin_addr.s_addr);
3595
3596         ret = cm_id->event_handler(cm_id, &cm_event);
3597         if (ret)
3598                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3599                                 __func__, __LINE__, ret);
3600
3601         return;
3602 }
3603
3604
3605 static void nes_cm_event_handler(struct work_struct *);
3606
3607 /**
3608  * nes_cm_post_event
3609  * post an event to the cm event handler
3610  */
3611 static int nes_cm_post_event(struct nes_cm_event *event)
3612 {
3613         atomic_inc(&event->cm_node->cm_core->events_posted);
3614         add_ref_cm_node(event->cm_node);
3615         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3616         INIT_WORK(&event->event_work, nes_cm_event_handler);
3617         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3618                 event->cm_node, event);
3619
3620         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3621
3622         nes_debug(NES_DBG_CM, "Exit\n");
3623         return 0;
3624 }
3625
3626
3627 /**
3628  * nes_cm_event_handler
3629  * worker function to handle cm events
3630  * will free instance of nes_cm_event
3631  */
3632 static void nes_cm_event_handler(struct work_struct *work)
3633 {
3634         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3635                         event_work);
3636         struct nes_cm_core *cm_core;
3637
3638         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3639                 return;
3640
3641         cm_core = event->cm_node->cm_core;
3642         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3643                 event, event->type, atomic_read(&cm_core->events_posted));
3644
3645         switch (event->type) {
3646         case NES_CM_EVENT_MPA_REQ:
3647                 cm_event_mpa_req(event);
3648                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3649                         event->cm_node);
3650                 break;
3651         case NES_CM_EVENT_RESET:
3652                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3653                         event->cm_node);
3654                 cm_event_reset(event);
3655                 break;
3656         case NES_CM_EVENT_CONNECTED:
3657                 if ((!event->cm_node->cm_id) ||
3658                         (event->cm_node->state != NES_CM_STATE_TSA))
3659                         break;
3660                 cm_event_connected(event);
3661                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3662                 break;
3663         case NES_CM_EVENT_MPA_REJECT:
3664                 if ((!event->cm_node->cm_id) ||
3665                                 (event->cm_node->state == NES_CM_STATE_TSA))
3666                         break;
3667                 cm_event_mpa_reject(event);
3668                 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3669                 break;
3670
3671         case NES_CM_EVENT_ABORTED:
3672                 if ((!event->cm_node->cm_id) ||
3673                         (event->cm_node->state == NES_CM_STATE_TSA))
3674                         break;
3675                 cm_event_connect_error(event);
3676                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3677                 break;
3678         case NES_CM_EVENT_DROPPED_PKT:
3679                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3680                 break;
3681         default:
3682                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3683                 break;
3684         }
3685
3686         atomic_dec(&cm_core->events_posted);
3687         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3688         rem_ref_cm_node(cm_core, event->cm_node);
3689         kfree(event);
3690
3691         return;
3692 }