drivers/infiniband/hw/nes/nes_cm.c

   1 /*
   2  * Copyright (c) 2006 - 2014 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 <linux/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 #include <linux/fcntl.h>
  63
  64 #include "nes.h"
  65
  66 u32 cm_packets_sent;
  67 u32 cm_packets_bounced;
  68 u32 cm_packets_dropped;
  69 u32 cm_packets_retrans;
  70 u32 cm_packets_created;
  71 u32 cm_packets_received;
  72 atomic_t cm_listens_created;
  73 atomic_t cm_listens_destroyed;
  74 u32 cm_backlog_drops;
  75 atomic_t cm_loopbacks;
  76 atomic_t cm_nodes_created;
  77 atomic_t cm_nodes_destroyed;
  78 atomic_t cm_accel_dropped_pkts;
  79 atomic_t cm_resets_recvd;
  80
  81 static inline int mini_cm_accelerated(struct nes_cm_core *, struct nes_cm_node *);
  82 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *, struct nes_vnic *, struct nes_cm_info *);
  83 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
  84 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *, struct nes_vnic *, u16, void *, struct nes_cm_info *);
  85 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
  86 static int mini_cm_accept(struct nes_cm_core *, struct nes_cm_node *);
  87 static int mini_cm_reject(struct nes_cm_core *, struct nes_cm_node *);
  88 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *, struct sk_buff *);
  89 static int mini_cm_dealloc_core(struct nes_cm_core *);
  90 static int mini_cm_get(struct nes_cm_core *);
  91 static int mini_cm_set(struct nes_cm_core *, u32, u32);
  92
  93 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *, void *, u32, void *, u32, u8);
  94 static int add_ref_cm_node(struct nes_cm_node *);
  95 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
  96
  97 static int nes_cm_disconn_true(struct nes_qp *);
  98 static int nes_cm_post_event(struct nes_cm_event *event);
  99 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
 100 static void nes_disconnect_worker(struct work_struct *work);
 101
 102 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
 103 static int send_mpa_reject(struct nes_cm_node *);
 104 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
 105 static int send_reset(struct nes_cm_node *, struct sk_buff *);
 106 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
 107 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
 108 static void process_packet(struct nes_cm_node *, struct sk_buff *, struct nes_cm_core *);
 109
 110 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
 111 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
 112 static void cleanup_retrans_entry(struct nes_cm_node *);
 113 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
 114 static void free_retrans_entry(struct nes_cm_node *cm_node);
 115 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph, struct sk_buff *skb, int optionsize, int passive);
 116
 117 /* CM event handler functions */
 118 static void cm_event_connected(struct nes_cm_event *);
 119 static void cm_event_connect_error(struct nes_cm_event *);
 120 static void cm_event_reset(struct nes_cm_event *);
 121 static void cm_event_mpa_req(struct nes_cm_event *);
 122 static void cm_event_mpa_reject(struct nes_cm_event *);
 123 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
 124
 125 /* MPA build functions */
 126 static int cm_build_mpa_frame(struct nes_cm_node *, u8 **, u16 *, u8 *, u8);
 127 static void build_mpa_v2(struct nes_cm_node *, void *, u8);
 128 static void build_mpa_v1(struct nes_cm_node *, void *, u8);
 129 static void build_rdma0_msg(struct nes_cm_node *, struct nes_qp **);
 130
 131 static void print_core(struct nes_cm_core *core);
 132 static void record_ird_ord(struct nes_cm_node *, u16, u16);
 133
 134 /* External CM API Interface */
 135 /* instance of function pointers for client API */
 136 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
 137 static struct nes_cm_ops nes_cm_api = {
 138         mini_cm_accelerated,
 139         mini_cm_listen,
 140         mini_cm_del_listen,
 141         mini_cm_connect,
 142         mini_cm_close,
 143         mini_cm_accept,
 144         mini_cm_reject,
 145         mini_cm_recv_pkt,
 146         mini_cm_dealloc_core,
 147         mini_cm_get,
 148         mini_cm_set
 149 };
 150
 151 static struct nes_cm_core *g_cm_core;
 152
 153 atomic_t cm_connects;
 154 atomic_t cm_accepts;
 155 atomic_t cm_disconnects;
 156 atomic_t cm_closes;
 157 atomic_t cm_connecteds;
 158 atomic_t cm_connect_reqs;
 159 atomic_t cm_rejects;
 160
 161 int nes_add_ref_cm_node(struct nes_cm_node *cm_node)
 162 {
 163         return add_ref_cm_node(cm_node);
 164 }
 165
 166 int nes_rem_ref_cm_node(struct nes_cm_node *cm_node)
 167 {
 168         return rem_ref_cm_node(cm_node->cm_core, cm_node);
 169 }
 170 /**
 171  * create_event
 172  */
 173 static struct nes_cm_event *create_event(struct nes_cm_node *   cm_node,
 174                                          enum nes_cm_event_type type)
 175 {
 176         struct nes_cm_event *event;
 177
 178         if (!cm_node->cm_id)
 179                 return NULL;
 180
 181         /* allocate an empty event */
 182         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 183
 184         if (!event)
 185                 return NULL;
 186
 187         event->type = type;
 188         event->cm_node = cm_node;
 189         event->cm_info.rem_addr = cm_node->rem_addr;
 190         event->cm_info.loc_addr = cm_node->loc_addr;
 191         event->cm_info.rem_port = cm_node->rem_port;
 192         event->cm_info.loc_port = cm_node->loc_port;
 193         event->cm_info.cm_id = cm_node->cm_id;
 194
 195         nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
 196                   "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
 197                   cm_node, event, type, event->cm_info.loc_addr,
 198                   event->cm_info.loc_port, event->cm_info.rem_addr,
 199                   event->cm_info.rem_port);
 200
 201         nes_cm_post_event(event);
 202         return event;
 203 }
 204
 205
 206 /**
 207  * send_mpa_request
 208  */
 209 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
 210 {
 211         u8 start_addr = 0;
 212         u8 *start_ptr = &start_addr;
 213         u8 **start_buff = &start_ptr;
 214         u16 buff_len = 0;
 215
 216         if (!skb) {
 217                 nes_debug(NES_DBG_CM, "skb set to NULL\n");
 218                 return -1;
 219         }
 220
 221         /* send an MPA Request frame */
 222         cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REQUEST);
 223         form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK);
 224
 225         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 226 }
 227
 228
 229
 230 static int send_mpa_reject(struct nes_cm_node *cm_node)
 231 {
 232         struct sk_buff *skb = NULL;
 233         u8 start_addr = 0;
 234         u8 *start_ptr = &start_addr;
 235         u8 **start_buff = &start_ptr;
 236         u16 buff_len = 0;
 237         struct ietf_mpa_v1 *mpa_frame;
 238
 239         skb = dev_alloc_skb(MAX_CM_BUFFER);
 240         if (!skb) {
 241                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 242                 return -ENOMEM;
 243         }
 244
 245         /* send an MPA reject frame */
 246         cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REPLY);
 247         mpa_frame = (struct ietf_mpa_v1 *)*start_buff;
 248         mpa_frame->flags |= IETF_MPA_FLAGS_REJECT;
 249         form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK | SET_FIN);
 250
 251         cm_node->state = NES_CM_STATE_FIN_WAIT1;
 252         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 253 }
 254
 255
 256 /**
 257  * recv_mpa - process a received TCP pkt, we are expecting an
 258  * IETF MPA frame
 259  */
 260 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
 261                      u32 len)
 262 {
 263         struct ietf_mpa_v1 *mpa_frame;
 264         struct ietf_mpa_v2 *mpa_v2_frame;
 265         struct ietf_rtr_msg *rtr_msg;
 266         int mpa_hdr_len;
 267         int priv_data_len;
 268
 269         *type = NES_MPA_REQUEST_ACCEPT;
 270
 271         /* assume req frame is in tcp data payload */
 272         if (len < sizeof(struct ietf_mpa_v1)) {
 273                 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
 274                 return -EINVAL;
 275         }
 276
 277         /* points to the beginning of the frame, which could be MPA V1 or V2 */
 278         mpa_frame = (struct ietf_mpa_v1 *)buffer;
 279         mpa_hdr_len = sizeof(struct ietf_mpa_v1);
 280         priv_data_len = ntohs(mpa_frame->priv_data_len);
 281
 282         /* make sure mpa private data len is less than 512 bytes */
 283         if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
 284                 nes_debug(NES_DBG_CM, "The received Length of Private"
 285                           " Data field exceeds 512 octets\n");
 286                 return -EINVAL;
 287         }
 288         /*
 289          * make sure MPA receiver interoperate with the
 290          * received MPA version and MPA key information
 291          *
 292          */
 293         if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
 294                 nes_debug(NES_DBG_CM, "The received mpa version"
 295                           " is not supported\n");
 296                 return -EINVAL;
 297         }
 298         /*
 299         * backwards compatibility only
 300         */
 301         if (mpa_frame->rev > cm_node->mpa_frame_rev) {
 302                 nes_debug(NES_DBG_CM, "The received mpa version"
 303                         " can not be interoperated\n");
 304                 return -EINVAL;
 305         } else {
 306                 cm_node->mpa_frame_rev = mpa_frame->rev;
 307         }
 308
 309         if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
 310                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
 311                         nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
 312                         return -EINVAL;
 313                 }
 314         } else {
 315                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
 316                         nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
 317                         return -EINVAL;
 318                 }
 319         }
 320
 321         if (priv_data_len + mpa_hdr_len != len) {
 322                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
 323                         " complete (%x + %x != %x)\n",
 324                         priv_data_len, mpa_hdr_len, len);
 325                 return -EINVAL;
 326         }
 327         /* make sure it does not exceed the max size */
 328         if (len > MAX_CM_BUFFER) {
 329                 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
 330                         " (%x + %x != %x)\n",
 331                         priv_data_len, mpa_hdr_len, len);
 332                 return -EINVAL;
 333         }
 334
 335         cm_node->mpa_frame_size = priv_data_len;
 336
 337         switch (mpa_frame->rev) {
 338         case IETF_MPA_V2: {
 339                 u16 ird_size;
 340                 u16 ord_size;
 341                 u16 rtr_ctrl_ird;
 342                 u16 rtr_ctrl_ord;
 343
 344                 mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
 345                 mpa_hdr_len += IETF_RTR_MSG_SIZE;
 346                 cm_node->mpa_frame_size -= IETF_RTR_MSG_SIZE;
 347                 rtr_msg = &mpa_v2_frame->rtr_msg;
 348
 349                 /* parse rtr message */
 350                 rtr_ctrl_ird = ntohs(rtr_msg->ctrl_ird);
 351                 rtr_ctrl_ord = ntohs(rtr_msg->ctrl_ord);
 352                 ird_size = rtr_ctrl_ird & IETF_NO_IRD_ORD;
 353                 ord_size = rtr_ctrl_ord & IETF_NO_IRD_ORD;
 354
 355                 if (!(rtr_ctrl_ird & IETF_PEER_TO_PEER)) {
 356                         /* send reset */
 357                         return -EINVAL;
 358                 }
 359                 if (ird_size == IETF_NO_IRD_ORD || ord_size == IETF_NO_IRD_ORD)
 360                         cm_node->mpav2_ird_ord = IETF_NO_IRD_ORD;
 361
 362                 if (cm_node->mpav2_ird_ord != IETF_NO_IRD_ORD) {
 363                         /* responder */
 364                         if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
 365                                 /* we are still negotiating */
 366                                 if (ord_size > NES_MAX_IRD) {
 367                                         cm_node->ird_size = NES_MAX_IRD;
 368                                 } else {
 369                                         cm_node->ird_size = ord_size;
 370                                         if (ord_size == 0 &&
 371                                         (rtr_ctrl_ord & IETF_RDMA0_READ)) {
 372                                                 cm_node->ird_size = 1;
 373                                                 nes_debug(NES_DBG_CM,
 374                                                 "%s: Remote peer doesn't support RDMA0_READ (ord=%u)\n",
 375                                                         __func__, ord_size);
 376                                         }
 377                                 }
 378                                 if (ird_size > NES_MAX_ORD)
 379                                         cm_node->ord_size = NES_MAX_ORD;
 380                                 else
 381                                         cm_node->ord_size = ird_size;
 382                         } else { /* initiator */
 383                                 if (ord_size > NES_MAX_IRD) {
 384                                         nes_debug(NES_DBG_CM,
 385                                         "%s: Unable to support the requested (ord =%u)\n",
 386                                                         __func__, ord_size);
 387                                         return -EINVAL;
 388                                 }
 389                                 cm_node->ird_size = ord_size;
 390
 391                                 if (ird_size > NES_MAX_ORD) {
 392                                         cm_node->ord_size = NES_MAX_ORD;
 393                                 } else {
 394                                         if (ird_size == 0 &&
 395                                         (rtr_ctrl_ord & IETF_RDMA0_READ)) {
 396                                                 nes_debug(NES_DBG_CM,
 397                                                 "%s: Remote peer doesn't support RDMA0_READ (ird=%u)\n",
 398                                                         __func__, ird_size);
 399                                                 return -EINVAL;
 400                                         } else {
 401                                                 cm_node->ord_size = ird_size;
 402                                         }
 403                                 }
 404                         }
 405                 }
 406
 407                 if (rtr_ctrl_ord & IETF_RDMA0_READ) {
 408                         cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
 409
 410                 } else if (rtr_ctrl_ord & IETF_RDMA0_WRITE) {
 411                         cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
 412                 } else {        /* Not supported RDMA0 operation */
 413                         return -EINVAL;
 414                 }
 415                 break;
 416         }
 417         case IETF_MPA_V1:
 418         default:
 419                 break;
 420         }
 421
 422         /* copy entire MPA frame to our cm_node's frame */
 423         memcpy(cm_node->mpa_frame_buf, buffer + mpa_hdr_len, cm_node->mpa_frame_size);
 424
 425         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
 426                 *type = NES_MPA_REQUEST_REJECT;
 427         return 0;
 428 }
 429
 430
 431 /**
 432  * form_cm_frame - get a free packet and build empty frame Use
 433  * node info to build.
 434  */
 435 static void form_cm_frame(struct sk_buff *skb,
 436                           struct nes_cm_node *cm_node, void *options, u32 optionsize,
 437                           void *data, u32 datasize, u8 flags)
 438 {
 439         struct tcphdr *tcph;
 440         struct iphdr *iph;
 441         struct ethhdr *ethh;
 442         u8 *buf;
 443         u16 packetsize = sizeof(*iph);
 444
 445         packetsize += sizeof(*tcph);
 446         packetsize += optionsize + datasize;
 447
 448         skb_trim(skb, 0);
 449         memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
 450
 451         buf = skb_put(skb, packetsize + ETH_HLEN);
 452
 453         ethh = (struct ethhdr *)buf;
 454         buf += ETH_HLEN;
 455
 456         iph = (struct iphdr *)buf;
 457         buf += sizeof(*iph);
 458         tcph = (struct tcphdr *)buf;
 459         skb_reset_mac_header(skb);
 460         skb_set_network_header(skb, ETH_HLEN);
 461         skb_set_transport_header(skb, ETH_HLEN + sizeof(*iph));
 462         buf += sizeof(*tcph);
 463
 464         skb->ip_summed = CHECKSUM_PARTIAL;
 465         if (!(cm_node->netdev->features & NETIF_F_IP_CSUM))
 466                 skb->ip_summed = CHECKSUM_NONE;
 467         skb->protocol = htons(0x800);
 468         skb->data_len = 0;
 469         skb->mac_len = ETH_HLEN;
 470
 471         memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
 472         memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
 473         ethh->h_proto = htons(0x0800);
 474
 475         iph->version = IPVERSION;
 476         iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
 477         iph->tos = 0;
 478         iph->tot_len = htons(packetsize);
 479         iph->id = htons(++cm_node->tcp_cntxt.loc_id);
 480
 481         iph->frag_off = htons(0x4000);
 482         iph->ttl = 0x40;
 483         iph->protocol = 0x06;   /* IPPROTO_TCP */
 484
 485         iph->saddr = htonl(cm_node->mapped_loc_addr);
 486         iph->daddr = htonl(cm_node->mapped_rem_addr);
 487
 488         tcph->source = htons(cm_node->mapped_loc_port);
 489         tcph->dest = htons(cm_node->mapped_rem_port);
 490         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
 491
 492         if (flags & SET_ACK) {
 493                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
 494                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
 495                 tcph->ack = 1;
 496         } else {
 497                 tcph->ack_seq = 0;
 498         }
 499
 500         if (flags & SET_SYN) {
 501                 cm_node->tcp_cntxt.loc_seq_num++;
 502                 tcph->syn = 1;
 503         } else {
 504                 cm_node->tcp_cntxt.loc_seq_num += datasize;
 505         }
 506
 507         if (flags & SET_FIN) {
 508                 cm_node->tcp_cntxt.loc_seq_num++;
 509                 tcph->fin = 1;
 510         }
 511
 512         if (flags & SET_RST)
 513                 tcph->rst = 1;
 514
 515         tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
 516         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
 517         tcph->urg_ptr = 0;
 518         if (optionsize)
 519                 memcpy(buf, options, optionsize);
 520         buf += optionsize;
 521         if (datasize)
 522                 memcpy(buf, data, datasize);
 523
 524         skb_shinfo(skb)->nr_frags = 0;
 525         cm_packets_created++;
 526 }
 527
 528 /*
 529  * nes_create_sockaddr - Record ip addr and tcp port in a sockaddr struct
 530  */
 531 static void nes_create_sockaddr(__be32 ip_addr, __be16 port,
 532                                 struct sockaddr_storage *addr)
 533 {
 534         struct sockaddr_in *nes_sockaddr = (struct sockaddr_in *)addr;
 535         nes_sockaddr->sin_family = AF_INET;
 536         memcpy(&nes_sockaddr->sin_addr.s_addr, &ip_addr, sizeof(__be32));
 537         nes_sockaddr->sin_port = port;
 538 }
 539
 540 /*
 541  * nes_create_mapinfo - Create a mapinfo object in the port mapper data base
 542  */
 543 static int nes_create_mapinfo(struct nes_cm_info *cm_info)
 544 {
 545         struct sockaddr_storage local_sockaddr;
 546         struct sockaddr_storage mapped_sockaddr;
 547
 548         nes_create_sockaddr(htonl(cm_info->loc_addr), htons(cm_info->loc_port),
 549                                 &local_sockaddr);
 550         nes_create_sockaddr(htonl(cm_info->mapped_loc_addr),
 551                         htons(cm_info->mapped_loc_port), &mapped_sockaddr);
 552
 553         return iwpm_create_mapinfo(&local_sockaddr,
 554                                 &mapped_sockaddr, RDMA_NL_NES);
 555 }
 556
 557 /*
 558  * nes_remove_mapinfo - Remove a mapinfo object from the port mapper data base
 559  *                      and send a remove mapping op message to
 560  *                      the userspace port mapper
 561  */
 562 static int nes_remove_mapinfo(u32 loc_addr, u16 loc_port,
 563                         u32 mapped_loc_addr, u16 mapped_loc_port)
 564 {
 565         struct sockaddr_storage local_sockaddr;
 566         struct sockaddr_storage mapped_sockaddr;
 567
 568         nes_create_sockaddr(htonl(loc_addr), htons(loc_port), &local_sockaddr);
 569         nes_create_sockaddr(htonl(mapped_loc_addr), htons(mapped_loc_port),
 570                                 &mapped_sockaddr);
 571
 572         iwpm_remove_mapinfo(&local_sockaddr, &mapped_sockaddr);
 573         return iwpm_remove_mapping(&local_sockaddr, RDMA_NL_NES);
 574 }
 575
 576 /*
 577  * nes_form_pm_msg - Form a port mapper message with mapping info
 578  */
 579 static void nes_form_pm_msg(struct nes_cm_info *cm_info,
 580                                 struct iwpm_sa_data *pm_msg)
 581 {
 582         nes_create_sockaddr(htonl(cm_info->loc_addr), htons(cm_info->loc_port),
 583                                 &pm_msg->loc_addr);
 584         nes_create_sockaddr(htonl(cm_info->rem_addr), htons(cm_info->rem_port),
 585                                 &pm_msg->rem_addr);
 586 }
 587
 588 /*
 589  * nes_form_reg_msg - Form a port mapper message with dev info
 590  */
 591 static void nes_form_reg_msg(struct nes_vnic *nesvnic,
 592                         struct iwpm_dev_data *pm_msg)
 593 {
 594         memcpy(pm_msg->dev_name, nesvnic->nesibdev->ibdev.name,
 595                                 IWPM_DEVNAME_SIZE);
 596         memcpy(pm_msg->if_name, nesvnic->netdev->name, IWPM_IFNAME_SIZE);
 597 }
 598
 599 /*
 600  * nes_record_pm_msg - Save the received mapping info
 601  */
 602 static void nes_record_pm_msg(struct nes_cm_info *cm_info,
 603                         struct iwpm_sa_data *pm_msg)
 604 {
 605         struct sockaddr_in *mapped_loc_addr =
 606                         (struct sockaddr_in *)&pm_msg->mapped_loc_addr;
 607         struct sockaddr_in *mapped_rem_addr =
 608                         (struct sockaddr_in *)&pm_msg->mapped_rem_addr;
 609
 610         if (mapped_loc_addr->sin_family == AF_INET) {
 611                 cm_info->mapped_loc_addr =
 612                         ntohl(mapped_loc_addr->sin_addr.s_addr);
 613                 cm_info->mapped_loc_port = ntohs(mapped_loc_addr->sin_port);
 614         }
 615         if (mapped_rem_addr->sin_family == AF_INET) {
 616                 cm_info->mapped_rem_addr =
 617                         ntohl(mapped_rem_addr->sin_addr.s_addr);
 618                 cm_info->mapped_rem_port = ntohs(mapped_rem_addr->sin_port);
 619         }
 620 }
 621
 622 /**
 623  * print_core - dump a cm core
 624  */
 625 static void print_core(struct nes_cm_core *core)
 626 {
 627         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 628         nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
 629         if (!core)
 630                 return;
 631         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 632
 633         nes_debug(NES_DBG_CM, "State         : %u \n", core->state);
 634
 635         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
 636         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
 637
 638         nes_debug(NES_DBG_CM, "core          : %p \n", core);
 639
 640         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
 641 }
 642
 643 static void record_ird_ord(struct nes_cm_node *cm_node,
 644                                         u16 conn_ird, u16 conn_ord)
 645 {
 646         if (conn_ird > NES_MAX_IRD)
 647                 conn_ird = NES_MAX_IRD;
 648
 649         if (conn_ord > NES_MAX_ORD)
 650                 conn_ord = NES_MAX_ORD;
 651
 652         cm_node->ird_size = conn_ird;
 653         cm_node->ord_size = conn_ord;
 654 }
 655
 656 /**
 657  * cm_build_mpa_frame - build a MPA V1 frame or MPA V2 frame
 658  */
 659 static int cm_build_mpa_frame(struct nes_cm_node *cm_node, u8 **start_buff,
 660                               u16 *buff_len, u8 *pci_mem, u8 mpa_key)
 661 {
 662         int ret = 0;
 663
 664         *start_buff = (pci_mem) ? pci_mem : &cm_node->mpa_frame_buf[0];
 665
 666         switch (cm_node->mpa_frame_rev) {
 667         case IETF_MPA_V1:
 668                 *start_buff = (u8 *)*start_buff + sizeof(struct ietf_rtr_msg);
 669                 *buff_len = sizeof(struct ietf_mpa_v1) + cm_node->mpa_frame_size;
 670                 build_mpa_v1(cm_node, *start_buff, mpa_key);
 671                 break;
 672         case IETF_MPA_V2:
 673                 *buff_len = sizeof(struct ietf_mpa_v2) + cm_node->mpa_frame_size;
 674                 build_mpa_v2(cm_node, *start_buff, mpa_key);
 675                 break;
 676         default:
 677                 ret = -EINVAL;
 678         }
 679         return ret;
 680 }
 681
 682 /**
 683  * build_mpa_v2 - build a MPA V2 frame
 684  */
 685 static void build_mpa_v2(struct nes_cm_node *cm_node,
 686                          void *start_addr, u8 mpa_key)
 687 {
 688         struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
 689         struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
 690         u16 ctrl_ird;
 691         u16 ctrl_ord;
 692
 693         /* initialize the upper 5 bytes of the frame */
 694         build_mpa_v1(cm_node, start_addr, mpa_key);
 695         mpa_frame->flags |= IETF_MPA_V2_FLAG; /* set a bit to indicate MPA V2 */
 696         mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);
 697
 698         /* initialize RTR msg */
 699         if (cm_node->mpav2_ird_ord == IETF_NO_IRD_ORD) {
 700                 ctrl_ird = IETF_NO_IRD_ORD;
 701                 ctrl_ord = IETF_NO_IRD_ORD;
 702         } else {
 703                 ctrl_ird = cm_node->ird_size & IETF_NO_IRD_ORD;
 704                 ctrl_ord = cm_node->ord_size & IETF_NO_IRD_ORD;
 705         }
 706         ctrl_ird |= IETF_PEER_TO_PEER;
 707         ctrl_ird |= IETF_FLPDU_ZERO_LEN;
 708
 709         switch (mpa_key) {
 710         case MPA_KEY_REQUEST:
 711                 ctrl_ord |= IETF_RDMA0_WRITE;
 712                 ctrl_ord |= IETF_RDMA0_READ;
 713                 break;
 714         case MPA_KEY_REPLY:
 715                 switch (cm_node->send_rdma0_op) {
 716                 case SEND_RDMA_WRITE_ZERO:
 717                         ctrl_ord |= IETF_RDMA0_WRITE;
 718                         break;
 719                 case SEND_RDMA_READ_ZERO:
 720                         ctrl_ord |= IETF_RDMA0_READ;
 721                         break;
 722                 }
 723         }
 724         rtr_msg->ctrl_ird = htons(ctrl_ird);
 725         rtr_msg->ctrl_ord = htons(ctrl_ord);
 726 }
 727
 728 /**
 729  * build_mpa_v1 - build a MPA V1 frame
 730  */
 731 static void build_mpa_v1(struct nes_cm_node *cm_node, void *start_addr, u8 mpa_key)
 732 {
 733         struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;
 734
 735         switch (mpa_key) {
 736         case MPA_KEY_REQUEST:
 737                 memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
 738                 break;
 739         case MPA_KEY_REPLY:
 740                 memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
 741                 break;
 742         }
 743         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
 744         mpa_frame->rev = cm_node->mpa_frame_rev;
 745         mpa_frame->priv_data_len = htons(cm_node->mpa_frame_size);
 746 }
 747
 748 static void build_rdma0_msg(struct nes_cm_node *cm_node, struct nes_qp **nesqp_addr)
 749 {
 750         u64 u64temp;
 751         struct nes_qp *nesqp = *nesqp_addr;
 752         struct nes_hw_qp_wqe *wqe = &nesqp->hwqp.sq_vbase[0];
 753
 754         u64temp = (unsigned long)nesqp->nesuqp_addr;
 755         u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
 756         set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
 757
 758         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
 759         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
 760
 761         switch (cm_node->send_rdma0_op) {
 762         case SEND_RDMA_WRITE_ZERO:
 763                 nes_debug(NES_DBG_CM, "Sending first write.\n");
 764                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
 765                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
 766                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
 767                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
 768                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
 769                 break;
 770
 771         case SEND_RDMA_READ_ZERO:
 772         default:
 773                 if (cm_node->send_rdma0_op != SEND_RDMA_READ_ZERO)
 774                         WARN(1, "Unsupported RDMA0 len operation=%u\n",
 775                              cm_node->send_rdma0_op);
 776                 nes_debug(NES_DBG_CM, "Sending first rdma operation.\n");
 777                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
 778                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAR);
 779                 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_LOW_IDX] = 1;
 780                 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_HIGH_IDX] = 0;
 781                 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_LENGTH_IDX] = 0;
 782                 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_STAG_IDX] = 1;
 783                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 1;
 784                 break;
 785         }
 786
 787         if (nesqp->sq_kmapped) {
 788                 nesqp->sq_kmapped = 0;
 789                 kunmap(nesqp->page);
 790         }
 791
 792         /*use the reserved spot on the WQ for the extra first WQE*/
 793         nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
 794                                                              NES_QPCONTEXT_ORDIRD_WRPDU |
 795                                                              NES_QPCONTEXT_ORDIRD_ALSMM));
 796         nesqp->skip_lsmm = 1;
 797         nesqp->hwqp.sq_tail = 0;
 798 }
 799
 800 /**
 801  * schedule_nes_timer
 802  * note - cm_node needs to be protected before calling this. Encase in:
 803  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 804  */
 805 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
 806                        enum nes_timer_type type, int send_retrans,
 807                        int close_when_complete)
 808 {
 809         unsigned long flags;
 810         struct nes_cm_core *cm_core = cm_node->cm_core;
 811         struct nes_timer_entry *new_send;
 812         int ret = 0;
 813
 814         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
 815         if (!new_send)
 816                 return -ENOMEM;
 817
 818         /* new_send->timetosend = currenttime */
 819         new_send->retrycount = NES_DEFAULT_RETRYS;
 820         new_send->retranscount = NES_DEFAULT_RETRANS;
 821         new_send->skb = skb;
 822         new_send->timetosend = jiffies;
 823         new_send->type = type;
 824         new_send->netdev = cm_node->netdev;
 825         new_send->send_retrans = send_retrans;
 826         new_send->close_when_complete = close_when_complete;
 827
 828         if (type == NES_TIMER_TYPE_CLOSE) {
 829                 new_send->timetosend += (HZ / 10);
 830                 if (cm_node->recv_entry) {
 831                         kfree(new_send);
 832                         WARN_ON(1);
 833                         return -EINVAL;
 834                 }
 835                 cm_node->recv_entry = new_send;
 836         }
 837
 838         if (type == NES_TIMER_TYPE_SEND) {
 839                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 840                 atomic_inc(&new_send->skb->users);
 841                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 842                 cm_node->send_entry = new_send;
 843                 add_ref_cm_node(cm_node);
 844                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 845                 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
 846
 847                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
 848                 if (ret != NETDEV_TX_OK) {
 849                         nes_debug(NES_DBG_CM, "Error sending packet %p "
 850                                   "(jiffies = %lu)\n", new_send, jiffies);
 851                         new_send->timetosend = jiffies;
 852                         ret = NETDEV_TX_OK;
 853                 } else {
 854                         cm_packets_sent++;
 855                         if (!send_retrans) {
 856                                 cleanup_retrans_entry(cm_node);
 857                                 if (close_when_complete)
 858                                         rem_ref_cm_node(cm_core, cm_node);
 859                                 return ret;
 860                         }
 861                 }
 862         }
 863
 864         if (!timer_pending(&cm_core->tcp_timer))
 865                 mod_timer(&cm_core->tcp_timer, new_send->timetosend);
 866
 867         return ret;
 868 }
 869
 870 static void nes_retrans_expired(struct nes_cm_node *cm_node)
 871 {
 872         struct iw_cm_id *cm_id = cm_node->cm_id;
 873         enum nes_cm_node_state state = cm_node->state;
 874         cm_node->state = NES_CM_STATE_CLOSED;
 875
 876         switch (state) {
 877         case NES_CM_STATE_SYN_RCVD:
 878         case NES_CM_STATE_CLOSING:
 879                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 880                 break;
 881         case NES_CM_STATE_LAST_ACK:
 882         case NES_CM_STATE_FIN_WAIT1:
 883                 if (cm_node->cm_id)
 884                         cm_id->rem_ref(cm_id);
 885                 send_reset(cm_node, NULL);
 886                 break;
 887         default:
 888                 add_ref_cm_node(cm_node);
 889                 send_reset(cm_node, NULL);
 890                 create_event(cm_node, NES_CM_EVENT_ABORTED);
 891         }
 892 }
 893
 894 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
 895 {
 896         struct nes_timer_entry *recv_entry = cm_node->recv_entry;
 897         struct iw_cm_id *cm_id = cm_node->cm_id;
 898         struct nes_qp *nesqp;
 899         unsigned long qplockflags;
 900
 901         if (!recv_entry)
 902                 return;
 903         nesqp = (struct nes_qp *)recv_entry->skb;
 904         if (nesqp) {
 905                 spin_lock_irqsave(&nesqp->lock, qplockflags);
 906                 if (nesqp->cm_id) {
 907                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 908                                   "refcount = %d: HIT A "
 909                                   "NES_TIMER_TYPE_CLOSE with something "
 910                                   "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 911                                   atomic_read(&nesqp->refcount));
 912                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
 913                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
 914                         nesqp->ibqp_state = IB_QPS_ERR;
 915                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 916                         nes_cm_disconn(nesqp);
 917                 } else {
 918                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 919                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 920                                   "refcount = %d: HIT A "
 921                                   "NES_TIMER_TYPE_CLOSE with nothing "
 922                                   "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 923                                   atomic_read(&nesqp->refcount));
 924                 }
 925         } else if (rem_node) {
 926                 /* TIME_WAIT state */
 927                 rem_ref_cm_node(cm_node->cm_core, cm_node);
 928         }
 929         if (cm_node->cm_id)
 930                 cm_id->rem_ref(cm_id);
 931         kfree(recv_entry);
 932         cm_node->recv_entry = NULL;
 933 }
 934
 935 /**
 936  * nes_cm_timer_tick
 937  */
 938 static void nes_cm_timer_tick(unsigned long pass)
 939 {
 940         unsigned long flags;
 941         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
 942         struct nes_cm_node *cm_node;
 943         struct nes_timer_entry *send_entry, *recv_entry;
 944         struct list_head *list_core_temp;
 945         struct list_head *list_node;
 946         struct nes_cm_core *cm_core = g_cm_core;
 947         u32 settimer = 0;
 948         unsigned long timetosend;
 949         int ret = NETDEV_TX_OK;
 950
 951         struct list_head timer_list;
 952
 953         INIT_LIST_HEAD(&timer_list);
 954         spin_lock_irqsave(&cm_core->ht_lock, flags);
 955
 956         list_for_each_safe(list_node, list_core_temp,
 957                            &cm_core->connected_nodes) {
 958                 cm_node = container_of(list_node, struct nes_cm_node, list);
 959                 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
 960                         add_ref_cm_node(cm_node);
 961                         list_add(&cm_node->timer_entry, &timer_list);
 962                 }
 963         }
 964         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 965
 966         list_for_each_safe(list_node, list_core_temp, &timer_list) {
 967                 cm_node = container_of(list_node, struct nes_cm_node,
 968                                        timer_entry);
 969                 recv_entry = cm_node->recv_entry;
 970
 971                 if (recv_entry) {
 972                         if (time_after(recv_entry->timetosend, jiffies)) {
 973                                 if (nexttimeout > recv_entry->timetosend ||
 974                                     !settimer) {
 975                                         nexttimeout = recv_entry->timetosend;
 976                                         settimer = 1;
 977                                 }
 978                         } else {
 979                                 handle_recv_entry(cm_node, 1);
 980                         }
 981                 }
 982
 983                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 984                 do {
 985                         send_entry = cm_node->send_entry;
 986                         if (!send_entry)
 987                                 break;
 988                         if (time_after(send_entry->timetosend, jiffies)) {
 989                                 if (cm_node->state != NES_CM_STATE_TSA) {
 990                                         if ((nexttimeout >
 991                                              send_entry->timetosend) ||
 992                                             !settimer) {
 993                                                 nexttimeout =
 994                                                         send_entry->timetosend;
 995                                                 settimer = 1;
 996                                         }
 997                                 } else {
 998                                         free_retrans_entry(cm_node);
 999                                 }
1000                                 break;
1001                         }
1002
1003                         if ((cm_node->state == NES_CM_STATE_TSA) ||
1004                             (cm_node->state == NES_CM_STATE_CLOSED)) {
1005                                 free_retrans_entry(cm_node);
1006                                 break;
1007                         }
1008
1009                         if (!send_entry->retranscount ||
1010                             !send_entry->retrycount) {
1011                                 cm_packets_dropped++;
1012                                 free_retrans_entry(cm_node);
1013
1014                                 spin_unlock_irqrestore(
1015                                         &cm_node->retrans_list_lock, flags);
1016                                 nes_retrans_expired(cm_node);
1017                                 cm_node->state = NES_CM_STATE_CLOSED;
1018                                 spin_lock_irqsave(&cm_node->retrans_list_lock,
1019                                                   flags);
1020                                 break;
1021                         }
1022                         atomic_inc(&send_entry->skb->users);
1023                         cm_packets_retrans++;
1024                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
1025                                   "for node %p, jiffies = %lu, time to send = "
1026                                   "%lu, retranscount = %u, send_entry->seq_num = "
1027                                   "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
1028                                   "0x%08X\n", send_entry, cm_node, jiffies,
1029                                   send_entry->timetosend,
1030                                   send_entry->retranscount,
1031                                   send_entry->seq_num,
1032                                   cm_node->tcp_cntxt.rem_ack_num);
1033
1034                         spin_unlock_irqrestore(&cm_node->retrans_list_lock,
1035                                                flags);
1036                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
1037                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1038                         if (ret != NETDEV_TX_OK) {
1039                                 nes_debug(NES_DBG_CM, "rexmit failed for "
1040                                           "node=%p\n", cm_node);
1041                                 cm_packets_bounced++;
1042                                 send_entry->retrycount--;
1043                                 nexttimeout = jiffies + NES_SHORT_TIME;
1044                                 settimer = 1;
1045                                 break;
1046                         } else {
1047                                 cm_packets_sent++;
1048                         }
1049                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
1050                                   "%u, retry count = %u.\n",
1051                                   send_entry->retranscount,
1052                                   send_entry->retrycount);
1053                         if (send_entry->send_retrans) {
1054                                 send_entry->retranscount--;
1055                                 timetosend = (NES_RETRY_TIMEOUT <<
1056                                               (NES_DEFAULT_RETRANS - send_entry->retranscount));
1057
1058                                 send_entry->timetosend = jiffies +
1059                                                          min(timetosend, NES_MAX_TIMEOUT);
1060                                 if (nexttimeout > send_entry->timetosend ||
1061                                     !settimer) {
1062                                         nexttimeout = send_entry->timetosend;
1063                                         settimer = 1;
1064                                 }
1065                         } else {
1066                                 int close_when_complete;
1067                                 close_when_complete =
1068                                         send_entry->close_when_complete;
1069                                 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
1070                                           cm_node, cm_node->state);
1071                                 free_retrans_entry(cm_node);
1072                                 if (close_when_complete)
1073                                         rem_ref_cm_node(cm_node->cm_core,
1074                                                         cm_node);
1075                         }
1076                 } while (0);
1077
1078                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1079                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1080         }
1081
1082         if (settimer) {
1083                 if (!timer_pending(&cm_core->tcp_timer))
1084                         mod_timer(&cm_core->tcp_timer, nexttimeout);
1085         }
1086 }
1087
1088
1089 /**
1090  * send_syn
1091  */
1092 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
1093                     struct sk_buff *skb)
1094 {
1095         int ret;
1096         int flags = SET_SYN;
1097         char optionsbuffer[sizeof(struct option_mss) +
1098                            sizeof(struct option_windowscale) + sizeof(struct option_base) +
1099                            TCP_OPTIONS_PADDING];
1100
1101         int optionssize = 0;
1102         /* Sending MSS option */
1103         union all_known_options *options;
1104
1105         if (!cm_node)
1106                 return -EINVAL;
1107
1108         options = (union all_known_options *)&optionsbuffer[optionssize];
1109         options->as_mss.optionnum = OPTION_NUMBER_MSS;
1110         options->as_mss.length = sizeof(struct option_mss);
1111         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
1112         optionssize += sizeof(struct option_mss);
1113
1114         options = (union all_known_options *)&optionsbuffer[optionssize];
1115         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
1116         options->as_windowscale.length = sizeof(struct option_windowscale);
1117         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
1118         optionssize += sizeof(struct option_windowscale);
1119
1120         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
1121                 options = (union all_known_options *)&optionsbuffer[optionssize];
1122                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
1123                 options->as_base.length = sizeof(struct option_base);
1124                 optionssize += sizeof(struct option_base);
1125                 /* we need the size to be a multiple of 4 */
1126                 options = (union all_known_options *)&optionsbuffer[optionssize];
1127                 options->as_end = 1;
1128                 optionssize += 1;
1129                 options = (union all_known_options *)&optionsbuffer[optionssize];
1130                 options->as_end = 1;
1131                 optionssize += 1;
1132         }
1133
1134         options = (union all_known_options *)&optionsbuffer[optionssize];
1135         options->as_end = OPTION_NUMBER_END;
1136         optionssize += 1;
1137
1138         if (!skb)
1139                 skb = dev_alloc_skb(MAX_CM_BUFFER);
1140         if (!skb) {
1141                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1142                 return -1;
1143         }
1144
1145         if (sendack)
1146                 flags |= SET_ACK;
1147
1148         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
1149         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1150
1151         return ret;
1152 }
1153
1154
1155 /**
1156  * send_reset
1157  */
1158 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
1159 {
1160         int ret;
1161         int flags = SET_RST | SET_ACK;
1162
1163         if (!skb)
1164                 skb = dev_alloc_skb(MAX_CM_BUFFER);
1165         if (!skb) {
1166                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1167                 return -ENOMEM;
1168         }
1169
1170         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
1171         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
1172
1173         return ret;
1174 }
1175
1176
1177 /**
1178  * send_ack
1179  */
1180 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
1181 {
1182         int ret;
1183
1184         if (!skb)
1185                 skb = dev_alloc_skb(MAX_CM_BUFFER);
1186
1187         if (!skb) {
1188                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1189                 return -1;
1190         }
1191
1192         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
1193         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
1194
1195         return ret;
1196 }
1197
1198
1199 /**
1200  * send_fin
1201  */
1202 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
1203 {
1204         int ret;
1205
1206         /* if we didn't get a frame get one */
1207         if (!skb)
1208                 skb = dev_alloc_skb(MAX_CM_BUFFER);
1209
1210         if (!skb) {
1211                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1212                 return -1;
1213         }
1214
1215         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
1216         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1217
1218         return ret;
1219 }
1220
1221
1222 /**
1223  * find_node - find a cm node that matches the reference cm node
1224  */
1225 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
1226                                      u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
1227 {
1228         unsigned long flags;
1229         struct list_head *hte;
1230         struct nes_cm_node *cm_node;
1231
1232         /* get a handle on the hte */
1233         hte = &cm_core->connected_nodes;
1234
1235         /* walk list and find cm_node associated with this session ID */
1236         spin_lock_irqsave(&cm_core->ht_lock, flags);
1237         list_for_each_entry(cm_node, hte, list) {
1238                 /* compare quad, return node handle if a match */
1239                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
1240                           cm_node->loc_addr, cm_node->loc_port,
1241                           loc_addr, loc_port,
1242                           cm_node->rem_addr, cm_node->rem_port,
1243                           rem_addr, rem_port);
1244                 if ((cm_node->mapped_loc_addr == loc_addr) &&
1245                         (cm_node->mapped_loc_port == loc_port) &&
1246                         (cm_node->mapped_rem_addr == rem_addr) &&
1247                         (cm_node->mapped_rem_port == rem_port)) {
1248
1249                         add_ref_cm_node(cm_node);
1250                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1251                         return cm_node;
1252                 }
1253         }
1254         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1255
1256         /* no owner node */
1257         return NULL;
1258 }
1259
1260
1261 /**
1262  * find_listener - find a cm node listening on this addr-port pair
1263  */
1264 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
1265                                         nes_addr_t dst_addr, u16 dst_port,
1266                                         enum nes_cm_listener_state listener_state, int local)
1267 {
1268         unsigned long flags;
1269         struct nes_cm_listener *listen_node;
1270         nes_addr_t listen_addr;
1271         u16 listen_port;
1272
1273         /* walk list and find cm_node associated with this session ID */
1274         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1275         list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
1276                 if (local) {
1277                         listen_addr = listen_node->loc_addr;
1278                         listen_port = listen_node->loc_port;
1279                 } else {
1280                         listen_addr = listen_node->mapped_loc_addr;
1281                         listen_port = listen_node->mapped_loc_port;
1282                 }
1283                 /* compare node pair, return node handle if a match */
1284                 if (((listen_addr == dst_addr) ||
1285                      listen_addr == 0x00000000) &&
1286                     (listen_port == dst_port) &&
1287                     (listener_state & listen_node->listener_state)) {
1288                         atomic_inc(&listen_node->ref_count);
1289                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1290                         return listen_node;
1291                 }
1292         }
1293         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1294
1295         /* no listener */
1296         return NULL;
1297 }
1298
1299 /**
1300  * add_hte_node - add a cm node to the hash table
1301  */
1302 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1303 {
1304         unsigned long flags;
1305         struct list_head *hte;
1306
1307         if (!cm_node || !cm_core)
1308                 return -EINVAL;
1309
1310         nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
1311                   cm_node);
1312
1313         spin_lock_irqsave(&cm_core->ht_lock, flags);
1314
1315         /* get a handle on the hash table element (list head for this slot) */
1316         hte = &cm_core->connected_nodes;
1317         list_add_tail(&cm_node->list, hte);
1318         atomic_inc(&cm_core->ht_node_cnt);
1319
1320         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1321
1322         return 0;
1323 }
1324
1325
1326 /**
1327  * mini_cm_dec_refcnt_listen
1328  */
1329 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
1330                                      struct nes_cm_listener *listener, int free_hanging_nodes)
1331 {
1332         int ret = -EINVAL;
1333         int err = 0;
1334         unsigned long flags;
1335         struct list_head *list_pos = NULL;
1336         struct list_head *list_temp = NULL;
1337         struct nes_cm_node *cm_node = NULL;
1338         struct list_head reset_list;
1339
1340         nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
1341                   "refcnt=%d\n", listener, free_hanging_nodes,
1342                   atomic_read(&listener->ref_count));
1343         /* free non-accelerated child nodes for this listener */
1344         INIT_LIST_HEAD(&reset_list);
1345         if (free_hanging_nodes) {
1346                 spin_lock_irqsave(&cm_core->ht_lock, flags);
1347                 list_for_each_safe(list_pos, list_temp,
1348                                    &g_cm_core->connected_nodes) {
1349                         cm_node = container_of(list_pos, struct nes_cm_node,
1350                                                list);
1351                         if ((cm_node->listener == listener) &&
1352                             (!cm_node->accelerated)) {
1353                                 add_ref_cm_node(cm_node);
1354                                 list_add(&cm_node->reset_entry, &reset_list);
1355                         }
1356                 }
1357                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1358         }
1359
1360         list_for_each_safe(list_pos, list_temp, &reset_list) {
1361                 cm_node = container_of(list_pos, struct nes_cm_node,
1362                                        reset_entry);
1363                 {
1364                         struct nes_cm_node *loopback = cm_node->loopbackpartner;
1365                         enum nes_cm_node_state old_state;
1366                         if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
1367                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1368                         } else {
1369                                 if (!loopback) {
1370                                         cleanup_retrans_entry(cm_node);
1371                                         err = send_reset(cm_node, NULL);
1372                                         if (err) {
1373                                                 cm_node->state =
1374                                                         NES_CM_STATE_CLOSED;
1375                                                 WARN_ON(1);
1376                                         } else {
1377                                                 old_state = cm_node->state;
1378                                                 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1379                                                 if (old_state != NES_CM_STATE_MPAREQ_RCVD)
1380                                                         rem_ref_cm_node(
1381                                                                 cm_node->cm_core,
1382                                                                 cm_node);
1383                                         }
1384                                 } else {
1385                                         struct nes_cm_event event;
1386
1387                                         event.cm_node = loopback;
1388                                         event.cm_info.rem_addr =
1389                                                         loopback->rem_addr;
1390                                         event.cm_info.loc_addr =
1391                                                         loopback->loc_addr;
1392                                         event.cm_info.rem_port =
1393                                                         loopback->rem_port;
1394                                         event.cm_info.loc_port =
1395                                                          loopback->loc_port;
1396                                         event.cm_info.cm_id = loopback->cm_id;
1397                                         add_ref_cm_node(loopback);
1398                                         loopback->state = NES_CM_STATE_CLOSED;
1399                                         cm_event_connect_error(&event);
1400                                         cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1401
1402                                         rem_ref_cm_node(cm_node->cm_core,
1403                                                          cm_node);
1404
1405                                 }
1406                         }
1407                 }
1408         }
1409
1410         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1411         if (!atomic_dec_return(&listener->ref_count)) {
1412                 list_del(&listener->list);
1413
1414                 /* decrement our listen node count */
1415                 atomic_dec(&cm_core->listen_node_cnt);
1416
1417                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1418
1419                 if (listener->nesvnic) {
1420                         nes_manage_apbvt(listener->nesvnic,
1421                                 listener->mapped_loc_port,
1422                                 PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn),
1423                                 NES_MANAGE_APBVT_DEL);
1424
1425                         nes_remove_mapinfo(listener->loc_addr,
1426                                         listener->loc_port,
1427                                         listener->mapped_loc_addr,
1428                                         listener->mapped_loc_port);
1429                         nes_debug(NES_DBG_NLMSG,
1430                                         "Delete APBVT mapped_loc_port = %04X\n",
1431                                         listener->mapped_loc_port);
1432                 }
1433
1434                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1435
1436                 kfree(listener);
1437                 listener = NULL;
1438                 ret = 0;
1439                 atomic_inc(&cm_listens_destroyed);
1440         } else {
1441                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1442         }
1443         if (listener) {
1444                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1445                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
1446                                   " with non-zero pending accepts=%u\n",
1447                                   listener, atomic_read(&listener->pend_accepts_cnt));
1448         }
1449
1450         return ret;
1451 }
1452
1453
1454 /**
1455  * mini_cm_del_listen
1456  */
1457 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1458                               struct nes_cm_listener *listener)
1459 {
1460         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1461         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1462         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1463 }
1464
1465
1466 /**
1467  * mini_cm_accelerated
1468  */
1469 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1470                                       struct nes_cm_node *cm_node)
1471 {
1472         cm_node->accelerated = 1;
1473
1474         if (cm_node->accept_pend) {
1475                 BUG_ON(!cm_node->listener);
1476                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1477                 cm_node->accept_pend = 0;
1478                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1479         }
1480
1481         if (!timer_pending(&cm_core->tcp_timer))
1482                 mod_timer(&cm_core->tcp_timer, (jiffies + NES_SHORT_TIME));
1483
1484         return 0;
1485 }
1486
1487
1488 /**
1489  * nes_addr_resolve_neigh
1490  */
1491 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
1492 {
1493         struct rtable *rt;
1494         struct neighbour *neigh;
1495         int rc = arpindex;
1496         struct net_device *netdev;
1497         struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1498
1499         rt = ip_route_output(&init_net, htonl(dst_ip), 0, 0, 0);
1500         if (IS_ERR(rt)) {
1501                 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1502                        __func__, dst_ip);
1503                 return rc;
1504         }
1505
1506         if (netif_is_bond_slave(nesvnic->netdev))
1507                 netdev = netdev_master_upper_dev_get(nesvnic->netdev);
1508         else
1509                 netdev = nesvnic->netdev;
1510
1511         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, netdev);
1512
1513         rcu_read_lock();
1514         if (neigh) {
1515                 if (neigh->nud_state & NUD_VALID) {
1516                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1517                                   " is %pM, Gateway is 0x%08X \n", dst_ip,
1518                                   neigh->ha, ntohl(rt->rt_gateway));
1519
1520                         if (arpindex >= 0) {
1521                                 if (ether_addr_equal(nesadapter->arp_table[arpindex].mac_addr, neigh->ha)) {
1522                                         /* Mac address same as in nes_arp_table */
1523                                         goto out;
1524                                 }
1525
1526                                 nes_manage_arp_cache(nesvnic->netdev,
1527                                                      nesadapter->arp_table[arpindex].mac_addr,
1528                                                      dst_ip, NES_ARP_DELETE);
1529                         }
1530
1531                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1532                                              dst_ip, NES_ARP_ADD);
1533                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1534                                            NES_ARP_RESOLVE);
1535                 } else {
1536                         neigh_event_send(neigh, NULL);
1537                 }
1538         }
1539 out:
1540         rcu_read_unlock();
1541
1542         if (neigh)
1543                 neigh_release(neigh);
1544
1545         ip_rt_put(rt);
1546         return rc;
1547 }
1548
1549 /**
1550  * make_cm_node - create a new instance of a cm node
1551  */
1552 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1553                                         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1554                                         struct nes_cm_listener *listener)
1555 {
1556         struct nes_cm_node *cm_node;
1557         struct timespec ts;
1558         int oldarpindex = 0;
1559         int arpindex = 0;
1560         struct nes_device *nesdev;
1561         struct nes_adapter *nesadapter;
1562
1563         /* create an hte and cm_node for this instance */
1564         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1565         if (!cm_node)
1566                 return NULL;
1567
1568         /* set our node specific transport info */
1569         cm_node->loc_addr = cm_info->loc_addr;
1570         cm_node->rem_addr = cm_info->rem_addr;
1571         cm_node->loc_port = cm_info->loc_port;
1572         cm_node->rem_port = cm_info->rem_port;
1573
1574         cm_node->mapped_loc_addr = cm_info->mapped_loc_addr;
1575         cm_node->mapped_rem_addr = cm_info->mapped_rem_addr;
1576         cm_node->mapped_loc_port = cm_info->mapped_loc_port;
1577         cm_node->mapped_rem_port = cm_info->mapped_rem_port;
1578
1579         cm_node->mpa_frame_rev = mpa_version;
1580         cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
1581         cm_node->mpav2_ird_ord = 0;
1582         cm_node->ird_size = 0;
1583         cm_node->ord_size = 0;
1584
1585         nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1586                   &cm_node->loc_addr, cm_node->loc_port,
1587                   &cm_node->rem_addr, cm_node->rem_port);
1588         cm_node->listener = listener;
1589         cm_node->netdev = nesvnic->netdev;
1590         cm_node->cm_id = cm_info->cm_id;
1591         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1592
1593         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1594                   cm_node->cm_id);
1595
1596         spin_lock_init(&cm_node->retrans_list_lock);
1597
1598         cm_node->loopbackpartner = NULL;
1599         atomic_set(&cm_node->ref_count, 1);
1600         /* associate our parent CM core */
1601         cm_node->cm_core = cm_core;
1602         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1603         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1604         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1605                                      NES_CM_DEFAULT_RCV_WND_SCALE;
1606         ts = current_kernel_time();
1607         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1608         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1609                                  sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1610         cm_node->tcp_cntxt.rcv_nxt = 0;
1611         /* get a unique session ID , add thread_id to an upcounter to handle race */
1612         atomic_inc(&cm_core->node_cnt);
1613         cm_node->conn_type = cm_info->conn_type;
1614         cm_node->apbvt_set = 0;
1615         cm_node->accept_pend = 0;
1616
1617         cm_node->nesvnic = nesvnic;
1618         /* get some device handles, for arp lookup */
1619         nesdev = nesvnic->nesdev;
1620         nesadapter = nesdev->nesadapter;
1621
1622         cm_node->loopbackpartner = NULL;
1623
1624         /* get the mac addr for the remote node */
1625         oldarpindex = nes_arp_table(nesdev, cm_node->mapped_rem_addr,
1626                                 NULL, NES_ARP_RESOLVE);
1627         arpindex = nes_addr_resolve_neigh(nesvnic,
1628                                 cm_node->mapped_rem_addr, oldarpindex);
1629         if (arpindex < 0) {
1630                 kfree(cm_node);
1631                 return NULL;
1632         }
1633
1634         /* copy the mac addr to node context */
1635         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1636         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1637                   cm_node->rem_mac);
1638
1639         add_hte_node(cm_core, cm_node);
1640         atomic_inc(&cm_nodes_created);
1641
1642         return cm_node;
1643 }
1644
1645
1646 /**
1647  * add_ref_cm_node - destroy an instance of a cm node
1648  */
1649 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1650 {
1651         atomic_inc(&cm_node->ref_count);
1652         return 0;
1653 }
1654
1655
1656 /**
1657  * rem_ref_cm_node - destroy an instance of a cm node
1658  */
1659 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1660                            struct nes_cm_node *cm_node)
1661 {
1662         unsigned long flags;
1663         struct nes_qp *nesqp;
1664
1665         if (!cm_node)
1666                 return -EINVAL;
1667
1668         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1669         if (atomic_dec_return(&cm_node->ref_count)) {
1670                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1671                 return 0;
1672         }
1673         list_del(&cm_node->list);
1674         atomic_dec(&cm_core->ht_node_cnt);
1675         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1676
1677         /* if the node is destroyed before connection was accelerated */
1678         if (!cm_node->accelerated && cm_node->accept_pend) {
1679                 BUG_ON(!cm_node->listener);
1680                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1681                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1682         }
1683         WARN_ON(cm_node->send_entry);
1684         if (cm_node->recv_entry)
1685                 handle_recv_entry(cm_node, 0);
1686         if (cm_node->listener) {
1687                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1688         } else {
1689                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1690                         nes_manage_apbvt(cm_node->nesvnic, cm_node->mapped_loc_port,
1691                                          PCI_FUNC(cm_node->nesvnic->nesdev->pcidev->devfn),
1692                                          NES_MANAGE_APBVT_DEL);
1693                 }
1694                 nes_debug(NES_DBG_NLMSG, "Delete APBVT mapped_loc_port = %04X\n",
1695                                         cm_node->mapped_loc_port);
1696                 nes_remove_mapinfo(cm_node->loc_addr, cm_node->loc_port,
1697                         cm_node->mapped_loc_addr, cm_node->mapped_loc_port);
1698         }
1699
1700         atomic_dec(&cm_core->node_cnt);
1701         atomic_inc(&cm_nodes_destroyed);
1702         nesqp = cm_node->nesqp;
1703         if (nesqp) {
1704                 nesqp->cm_node = NULL;
1705                 nes_rem_ref(&nesqp->ibqp);
1706                 cm_node->nesqp = NULL;
1707         }
1708
1709         kfree(cm_node);
1710         return 0;
1711 }
1712
1713 /**
1714  * process_options
1715  */
1716 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1717                            u32 optionsize, u32 syn_packet)
1718 {
1719         u32 tmp;
1720         u32 offset = 0;
1721         union all_known_options *all_options;
1722         char got_mss_option = 0;
1723
1724         while (offset < optionsize) {
1725                 all_options = (union all_known_options *)(optionsloc + offset);
1726                 switch (all_options->as_base.optionnum) {
1727                 case OPTION_NUMBER_END:
1728                         offset = optionsize;
1729                         break;
1730                 case OPTION_NUMBER_NONE:
1731                         offset += 1;
1732                         continue;
1733                 case OPTION_NUMBER_MSS:
1734                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1735                                   "Size: %d\n", __func__,
1736                                   all_options->as_mss.length, offset, optionsize);
1737                         got_mss_option = 1;
1738                         if (all_options->as_mss.length != 4) {
1739                                 return 1;
1740                         } else {
1741                                 tmp = ntohs(all_options->as_mss.mss);
1742                                 if (tmp > 0 && tmp <
1743                                     cm_node->tcp_cntxt.mss)
1744                                         cm_node->tcp_cntxt.mss = tmp;
1745                         }
1746                         break;
1747                 case OPTION_NUMBER_WINDOW_SCALE:
1748                         cm_node->tcp_cntxt.snd_wscale =
1749                                 all_options->as_windowscale.shiftcount;
1750                         break;
1751                 default:
1752                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1753                                   all_options->as_base.optionnum);
1754                         break;
1755                 }
1756                 offset += all_options->as_base.length;
1757         }
1758         if ((!got_mss_option) && (syn_packet))
1759                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1760         return 0;
1761 }
1762
1763 static void drop_packet(struct sk_buff *skb)
1764 {
1765         atomic_inc(&cm_accel_dropped_pkts);
1766         dev_kfree_skb_any(skb);
1767 }
1768
1769 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1770 {
1771         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1772                   "refcnt=%d\n", cm_node, cm_node->state,
1773                   atomic_read(&cm_node->ref_count));
1774         switch (cm_node->state) {
1775         case NES_CM_STATE_SYN_RCVD:
1776         case NES_CM_STATE_SYN_SENT:
1777         case NES_CM_STATE_ESTABLISHED:
1778         case NES_CM_STATE_MPAREJ_RCVD:
1779                 cm_node->tcp_cntxt.rcv_nxt++;
1780                 cleanup_retrans_entry(cm_node);
1781                 cm_node->state = NES_CM_STATE_LAST_ACK;
1782                 send_fin(cm_node, NULL);
1783                 break;
1784         case NES_CM_STATE_MPAREQ_SENT:
1785                 create_event(cm_node, NES_CM_EVENT_ABORTED);
1786                 cm_node->tcp_cntxt.rcv_nxt++;
1787                 cleanup_retrans_entry(cm_node);
1788                 cm_node->state = NES_CM_STATE_CLOSED;
1789                 add_ref_cm_node(cm_node);
1790                 send_reset(cm_node, NULL);
1791                 break;
1792         case NES_CM_STATE_FIN_WAIT1:
1793                 cm_node->tcp_cntxt.rcv_nxt++;
1794                 cleanup_retrans_entry(cm_node);
1795                 cm_node->state = NES_CM_STATE_CLOSING;
1796                 send_ack(cm_node, NULL);
1797                 /* Wait for ACK as this is simultaneous close..
1798                 * After we receive ACK, do not send anything..
1799                 * Just rm the node.. Done.. */
1800                 break;
1801         case NES_CM_STATE_FIN_WAIT2:
1802                 cm_node->tcp_cntxt.rcv_nxt++;
1803                 cleanup_retrans_entry(cm_node);
1804                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1805                 send_ack(cm_node, NULL);
1806                 schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
1807                 break;
1808         case NES_CM_STATE_TIME_WAIT:
1809                 cm_node->tcp_cntxt.rcv_nxt++;
1810                 cleanup_retrans_entry(cm_node);
1811                 cm_node->state = NES_CM_STATE_CLOSED;
1812                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1813                 break;
1814         case NES_CM_STATE_TSA:
1815         default:
1816                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1817                         cm_node, cm_node->state);
1818                 break;
1819         }
1820 }
1821
1822
1823 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1824         struct tcphdr *tcph)
1825 {
1826
1827         int     reset = 0;      /* whether to send reset in case of err.. */
1828         atomic_inc(&cm_resets_recvd);
1829         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1830                         " refcnt=%d\n", cm_node, cm_node->state,
1831                         atomic_read(&cm_node->ref_count));
1832         cleanup_retrans_entry(cm_node);
1833         switch (cm_node->state) {
1834         case NES_CM_STATE_SYN_SENT:
1835         case NES_CM_STATE_MPAREQ_SENT:
1836                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1837                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1838                         cm_node->listener, cm_node->state);
1839                 switch (cm_node->mpa_frame_rev) {
1840                 case IETF_MPA_V2:
1841                         cm_node->mpa_frame_rev = IETF_MPA_V1;
1842                         /* send a syn and goto syn sent state */
1843                         cm_node->state = NES_CM_STATE_SYN_SENT;
1844                         if (send_syn(cm_node, 0, NULL)) {
1845                                 active_open_err(cm_node, skb, reset);
1846                         }
1847                         break;
1848                 case IETF_MPA_V1:
1849                 default:
1850                         active_open_err(cm_node, skb, reset);
1851                         break;
1852                 }
1853                 break;
1854         case NES_CM_STATE_MPAREQ_RCVD:
1855                 atomic_inc(&cm_node->passive_state);
1856                 dev_kfree_skb_any(skb);
1857                 break;
1858         case NES_CM_STATE_ESTABLISHED:
1859         case NES_CM_STATE_SYN_RCVD:
1860         case NES_CM_STATE_LISTENING:
1861                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1862                 passive_open_err(cm_node, skb, reset);
1863                 break;
1864         case NES_CM_STATE_TSA:
1865                 active_open_err(cm_node, skb, reset);
1866                 break;
1867         case NES_CM_STATE_CLOSED:
1868                 drop_packet(skb);
1869                 break;
1870         case NES_CM_STATE_FIN_WAIT2:
1871         case NES_CM_STATE_FIN_WAIT1:
1872         case NES_CM_STATE_LAST_ACK:
1873                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1874         case NES_CM_STATE_TIME_WAIT:
1875                 cm_node->state = NES_CM_STATE_CLOSED;
1876                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1877                 drop_packet(skb);
1878                 break;
1879         default:
1880                 drop_packet(skb);
1881                 break;
1882         }
1883 }
1884
1885
1886 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1887 {
1888         int ret = 0;
1889         int datasize = skb->len;
1890         u8 *dataloc = skb->data;
1891
1892         enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1893         u32 res_type;
1894
1895         ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1896         if (ret) {
1897                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1898                 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1899                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1900                                   "cm_node=%p listener=%p state=%d\n", __func__,
1901                                   __LINE__, cm_node, cm_node->listener,
1902                                   cm_node->state);
1903                         active_open_err(cm_node, skb, 1);
1904                 } else {
1905                         passive_open_err(cm_node, skb, 1);
1906                 }
1907                 return;
1908         }
1909
1910         switch (cm_node->state) {
1911         case NES_CM_STATE_ESTABLISHED:
1912                 if (res_type == NES_MPA_REQUEST_REJECT)
1913                         /*BIG problem as we are receiving the MPA.. So should
1914                          * not be REJECT.. This is Passive Open.. We can
1915                          * only receive it Reject for Active Open...*/
1916                         WARN_ON(1);
1917                 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1918                 type = NES_CM_EVENT_MPA_REQ;
1919                 atomic_set(&cm_node->passive_state,
1920                            NES_PASSIVE_STATE_INDICATED);
1921                 break;
1922         case NES_CM_STATE_MPAREQ_SENT:
1923                 cleanup_retrans_entry(cm_node);
1924                 if (res_type == NES_MPA_REQUEST_REJECT) {
1925                         type = NES_CM_EVENT_MPA_REJECT;
1926                         cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1927                 } else {
1928                         type = NES_CM_EVENT_CONNECTED;
1929                         cm_node->state = NES_CM_STATE_TSA;
1930                 }
1931
1932                 break;
1933         default:
1934                 WARN_ON(1);
1935                 break;
1936         }
1937         dev_kfree_skb_any(skb);
1938         create_event(cm_node, type);
1939 }
1940
1941 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1942 {
1943         switch (cm_node->state) {
1944         case NES_CM_STATE_SYN_SENT:
1945         case NES_CM_STATE_MPAREQ_SENT:
1946                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1947                           "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1948                           cm_node->listener, cm_node->state);
1949                 active_open_err(cm_node, skb, 1);
1950                 break;
1951         case NES_CM_STATE_ESTABLISHED:
1952         case NES_CM_STATE_SYN_RCVD:
1953                 passive_open_err(cm_node, skb, 1);
1954                 break;
1955         case NES_CM_STATE_TSA:
1956         default:
1957                 drop_packet(skb);
1958         }
1959 }
1960
1961 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1962                      struct sk_buff *skb)
1963 {
1964         int err;
1965
1966         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num)) ? 0 : 1;
1967         if (err)
1968                 active_open_err(cm_node, skb, 1);
1969
1970         return err;
1971 }
1972
1973 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1974                      struct sk_buff *skb)
1975 {
1976         int err = 0;
1977         u32 seq;
1978         u32 ack_seq;
1979         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1980         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1981         u32 rcv_wnd;
1982
1983         seq = ntohl(tcph->seq);
1984         ack_seq = ntohl(tcph->ack_seq);
1985         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1986         if (ack_seq != loc_seq_num)
1987                 err = 1;
1988         else if (!between(seq, rcv_nxt, (rcv_nxt + rcv_wnd)))
1989                 err = 1;
1990         if (err) {
1991                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1992                           "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1993                           cm_node->listener, cm_node->state);
1994                 indicate_pkt_err(cm_node, skb);
1995                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1996                           "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1997                           rcv_wnd);
1998         }
1999         return err;
2000 }
2001
2002 /*
2003  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
2004  * is created with a listener or it may comein as rexmitted packet which in
2005  * that case will be just dropped.
2006  */
2007 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
2008                            struct tcphdr *tcph)
2009 {
2010         int ret;
2011         u32 inc_sequence;
2012         int optionsize;
2013
2014         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2015         skb_trim(skb, 0);
2016         inc_sequence = ntohl(tcph->seq);
2017
2018         switch (cm_node->state) {
2019         case NES_CM_STATE_SYN_SENT:
2020         case NES_CM_STATE_MPAREQ_SENT:
2021                 /* Rcvd syn on active open connection*/
2022                 active_open_err(cm_node, skb, 1);
2023                 break;
2024         case NES_CM_STATE_LISTENING:
2025                 /* Passive OPEN */
2026                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
2027                     cm_node->listener->backlog) {
2028                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
2029                                   "pressure \n");
2030                         cm_backlog_drops++;
2031                         passive_open_err(cm_node, skb, 0);
2032                         break;
2033                 }
2034                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
2035                                          1);
2036                 if (ret) {
2037                         passive_open_err(cm_node, skb, 0);
2038                         /* drop pkt */
2039                         break;
2040                 }
2041                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
2042                 BUG_ON(cm_node->send_entry);
2043                 cm_node->accept_pend = 1;
2044                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
2045
2046                 cm_node->state = NES_CM_STATE_SYN_RCVD;
2047                 send_syn(cm_node, 1, skb);
2048                 break;
2049         case NES_CM_STATE_CLOSED:
2050                 cleanup_retrans_entry(cm_node);
2051                 add_ref_cm_node(cm_node);
2052                 send_reset(cm_node, skb);
2053                 break;
2054         case NES_CM_STATE_TSA:
2055         case NES_CM_STATE_ESTABLISHED:
2056         case NES_CM_STATE_FIN_WAIT1:
2057         case NES_CM_STATE_FIN_WAIT2:
2058         case NES_CM_STATE_MPAREQ_RCVD:
2059         case NES_CM_STATE_LAST_ACK:
2060         case NES_CM_STATE_CLOSING:
2061         case NES_CM_STATE_UNKNOWN:
2062         default:
2063                 drop_packet(skb);
2064                 break;
2065         }
2066 }
2067
2068 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
2069                               struct tcphdr *tcph)
2070 {
2071         int ret;
2072         u32 inc_sequence;
2073         int optionsize;
2074
2075         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2076         skb_trim(skb, 0);
2077         inc_sequence = ntohl(tcph->seq);
2078         switch (cm_node->state) {
2079         case NES_CM_STATE_SYN_SENT:
2080                 cleanup_retrans_entry(cm_node);
2081                 /* active open */
2082                 if (check_syn(cm_node, tcph, skb))
2083                         return;
2084                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2085                 /* setup options */
2086                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
2087                 if (ret) {
2088                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
2089                                   cm_node);
2090                         break;
2091                 }
2092                 cleanup_retrans_entry(cm_node);
2093                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
2094                 send_mpa_request(cm_node, skb);
2095                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
2096                 break;
2097         case NES_CM_STATE_MPAREQ_RCVD:
2098                 /* passive open, so should not be here */
2099                 passive_open_err(cm_node, skb, 1);
2100                 break;
2101         case NES_CM_STATE_LISTENING:
2102                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2103                 cleanup_retrans_entry(cm_node);
2104                 cm_node->state = NES_CM_STATE_CLOSED;
2105                 send_reset(cm_node, skb);
2106                 break;
2107         case NES_CM_STATE_CLOSED:
2108                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2109                 cleanup_retrans_entry(cm_node);
2110                 add_ref_cm_node(cm_node);
2111                 send_reset(cm_node, skb);
2112                 break;
2113         case NES_CM_STATE_ESTABLISHED:
2114         case NES_CM_STATE_FIN_WAIT1:
2115         case NES_CM_STATE_FIN_WAIT2:
2116         case NES_CM_STATE_LAST_ACK:
2117         case NES_CM_STATE_TSA:
2118         case NES_CM_STATE_CLOSING:
2119         case NES_CM_STATE_UNKNOWN:
2120         case NES_CM_STATE_MPAREQ_SENT:
2121         default:
2122                 drop_packet(skb);
2123                 break;
2124         }
2125 }
2126
2127 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
2128                           struct tcphdr *tcph)
2129 {
2130         int datasize = 0;
2131         u32 inc_sequence;
2132         int ret = 0;
2133         int optionsize;
2134
2135         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2136
2137         if (check_seq(cm_node, tcph, skb))
2138                 return -EINVAL;
2139
2140         skb_pull(skb, tcph->doff << 2);
2141         inc_sequence = ntohl(tcph->seq);
2142         datasize = skb->len;
2143         switch (cm_node->state) {
2144         case NES_CM_STATE_SYN_RCVD:
2145                 /* Passive OPEN */
2146                 cleanup_retrans_entry(cm_node);
2147                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
2148                 if (ret)
2149                         break;
2150                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2151                 cm_node->state = NES_CM_STATE_ESTABLISHED;
2152                 if (datasize) {
2153                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2154                         handle_rcv_mpa(cm_node, skb);
2155                 } else { /* rcvd ACK only */
2156                         dev_kfree_skb_any(skb);
2157                 }
2158                 break;
2159         case NES_CM_STATE_ESTABLISHED:
2160                 /* Passive OPEN */
2161                 cleanup_retrans_entry(cm_node);
2162                 if (datasize) {
2163                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2164                         handle_rcv_mpa(cm_node, skb);
2165                 } else {
2166                         drop_packet(skb);
2167                 }
2168                 break;
2169         case NES_CM_STATE_MPAREQ_SENT:
2170                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2171                 if (datasize) {
2172                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2173                         handle_rcv_mpa(cm_node, skb);
2174                 } else { /* Could be just an ack pkt.. */
2175                         dev_kfree_skb_any(skb);
2176                 }
2177                 break;
2178         case NES_CM_STATE_LISTENING:
2179                 cleanup_retrans_entry(cm_node);
2180                 cm_node->state = NES_CM_STATE_CLOSED;
2181                 send_reset(cm_node, skb);
2182                 break;
2183         case NES_CM_STATE_CLOSED:
2184                 cleanup_retrans_entry(cm_node);
2185                 add_ref_cm_node(cm_node);
2186                 send_reset(cm_node, skb);
2187                 break;
2188         case NES_CM_STATE_LAST_ACK:
2189         case NES_CM_STATE_CLOSING:
2190                 cleanup_retrans_entry(cm_node);
2191                 cm_node->state = NES_CM_STATE_CLOSED;
2192                 cm_node->cm_id->rem_ref(cm_node->cm_id);
2193                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2194                 drop_packet(skb);
2195                 break;
2196         case NES_CM_STATE_FIN_WAIT1:
2197                 cleanup_retrans_entry(cm_node);
2198                 drop_packet(skb);
2199                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
2200                 break;
2201         case NES_CM_STATE_SYN_SENT:
2202         case NES_CM_STATE_FIN_WAIT2:
2203         case NES_CM_STATE_TSA:
2204         case NES_CM_STATE_MPAREQ_RCVD:
2205         case NES_CM_STATE_UNKNOWN:
2206         default:
2207                 cleanup_retrans_entry(cm_node);
2208                 drop_packet(skb);
2209                 break;
2210         }
2211         return ret;
2212 }
2213
2214
2215
2216 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
2217                               struct sk_buff *skb, int optionsize, int passive)
2218 {
2219         u8 *optionsloc = (u8 *)&tcph[1];
2220
2221         if (optionsize) {
2222                 if (process_options(cm_node, optionsloc, optionsize,
2223                                     (u32)tcph->syn)) {
2224                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
2225                                   __func__, cm_node);
2226                         if (passive)
2227                                 passive_open_err(cm_node, skb, 1);
2228                         else
2229                                 active_open_err(cm_node, skb, 1);
2230                         return 1;
2231                 }
2232         }
2233
2234         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
2235                                      cm_node->tcp_cntxt.snd_wscale;
2236
2237         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
2238                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
2239         return 0;
2240 }
2241
2242 /*
2243  * active_open_err() will send reset() if flag set..
2244  * It will also send ABORT event.
2245  */
2246 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2247                             int reset)
2248 {
2249         cleanup_retrans_entry(cm_node);
2250         if (reset) {
2251                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
2252                           "state=%d\n", cm_node, cm_node->state);
2253                 add_ref_cm_node(cm_node);
2254                 send_reset(cm_node, skb);
2255         } else {
2256                 dev_kfree_skb_any(skb);
2257         }
2258
2259         cm_node->state = NES_CM_STATE_CLOSED;
2260         create_event(cm_node, NES_CM_EVENT_ABORTED);
2261 }
2262
2263 /*
2264  * passive_open_err() will either do a reset() or will free up the skb and
2265  * remove the cm_node.
2266  */
2267 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2268                              int reset)
2269 {
2270         cleanup_retrans_entry(cm_node);
2271         cm_node->state = NES_CM_STATE_CLOSED;
2272         if (reset) {
2273                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
2274                           "cm_node=%p state =%d\n", cm_node, cm_node->state);
2275                 send_reset(cm_node, skb);
2276         } else {
2277                 dev_kfree_skb_any(skb);
2278                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2279         }
2280 }
2281
2282 /*
2283  * free_retrans_entry() routines assumes that the retrans_list_lock has
2284  * been acquired before calling.
2285  */
2286 static void free_retrans_entry(struct nes_cm_node *cm_node)
2287 {
2288         struct nes_timer_entry *send_entry;
2289
2290         send_entry = cm_node->send_entry;
2291         if (send_entry) {
2292                 cm_node->send_entry = NULL;
2293                 dev_kfree_skb_any(send_entry->skb);
2294                 kfree(send_entry);
2295                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2296         }
2297 }
2298
2299 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
2300 {
2301         unsigned long flags;
2302
2303         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
2304         free_retrans_entry(cm_node);
2305         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
2306 }
2307
2308 /**
2309  * process_packet
2310  * Returns skb if to be freed, else it will return NULL if already used..
2311  */
2312 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
2313                            struct nes_cm_core *cm_core)
2314 {
2315         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
2316         struct tcphdr *tcph = tcp_hdr(skb);
2317         u32 fin_set = 0;
2318         int ret = 0;
2319
2320         skb_pull(skb, ip_hdr(skb)->ihl << 2);
2321
2322         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
2323                   "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
2324                   tcph->ack, tcph->rst, tcph->fin);
2325
2326         if (tcph->rst) {
2327                 pkt_type = NES_PKT_TYPE_RST;
2328         } else if (tcph->syn) {
2329                 pkt_type = NES_PKT_TYPE_SYN;
2330                 if (tcph->ack)
2331                         pkt_type = NES_PKT_TYPE_SYNACK;
2332         } else if (tcph->ack) {
2333                 pkt_type = NES_PKT_TYPE_ACK;
2334         }
2335         if (tcph->fin)
2336                 fin_set = 1;
2337
2338         switch (pkt_type) {
2339         case NES_PKT_TYPE_SYN:
2340                 handle_syn_pkt(cm_node, skb, tcph);
2341                 break;
2342         case NES_PKT_TYPE_SYNACK:
2343                 handle_synack_pkt(cm_node, skb, tcph);
2344                 break;
2345         case NES_PKT_TYPE_ACK:
2346                 ret = handle_ack_pkt(cm_node, skb, tcph);
2347                 if (fin_set && !ret)
2348                         handle_fin_pkt(cm_node);
2349                 break;
2350         case NES_PKT_TYPE_RST:
2351                 handle_rst_pkt(cm_node, skb, tcph);
2352                 break;
2353         default:
2354                 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
2355                         handle_fin_pkt(cm_node);
2356                 drop_packet(skb);
2357                 break;
2358         }
2359 }
2360
2361 /**
2362  * mini_cm_listen - create a listen node with params
2363  */
2364 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
2365                         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
2366 {
2367         struct nes_cm_listener *listener;
2368         struct iwpm_dev_data pm_reg_msg;
2369         struct iwpm_sa_data pm_msg;
2370         unsigned long flags;
2371         int iwpm_err = 0;
2372
2373         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
2374                   cm_info->loc_addr, cm_info->loc_port);
2375
2376         /* cannot have multiple matching listeners */
2377         listener = find_listener(cm_core, cm_info->loc_addr, cm_info->loc_port,
2378                                 NES_CM_LISTENER_EITHER_STATE, 1);
2379
2380         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
2381                 /* find automatically incs ref count ??? */
2382                 atomic_dec(&listener->ref_count);
2383                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
2384                 return NULL;
2385         }
2386
2387         if (!listener) {
2388                 nes_form_reg_msg(nesvnic, &pm_reg_msg);
2389                 iwpm_err = iwpm_register_pid(&pm_reg_msg, RDMA_NL_NES);
2390                 if (iwpm_err) {
2391                         nes_debug(NES_DBG_NLMSG,
2392                         "Port Mapper reg pid fail (err = %d).\n", iwpm_err);
2393                 }
2394                 if (iwpm_valid_pid() && !iwpm_err) {
2395                         nes_form_pm_msg(cm_info, &pm_msg);
2396                         iwpm_err = iwpm_add_mapping(&pm_msg, RDMA_NL_NES);
2397                         if (iwpm_err)
2398                                 nes_debug(NES_DBG_NLMSG,
2399                                 "Port Mapper query fail (err = %d).\n", iwpm_err);
2400                         else
2401                                 nes_record_pm_msg(cm_info, &pm_msg);
2402                 }
2403
2404                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
2405                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
2406                 if (!listener) {
2407                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
2408                         return NULL;
2409                 }
2410
2411                 listener->loc_addr = cm_info->loc_addr;
2412                 listener->loc_port = cm_info->loc_port;
2413                 listener->mapped_loc_addr = cm_info->mapped_loc_addr;
2414                 listener->mapped_loc_port = cm_info->mapped_loc_port;
2415                 listener->reused_node = 0;
2416
2417                 atomic_set(&listener->ref_count, 1);
2418         }
2419         /* pasive case */
2420         /* find already inc'ed the ref count */
2421         else {
2422                 listener->reused_node = 1;
2423         }
2424
2425         listener->cm_id = cm_info->cm_id;
2426         atomic_set(&listener->pend_accepts_cnt, 0);
2427         listener->cm_core = cm_core;
2428         listener->nesvnic = nesvnic;
2429         atomic_inc(&cm_core->node_cnt);
2430
2431         listener->conn_type = cm_info->conn_type;
2432         listener->backlog = cm_info->backlog;
2433         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
2434
2435         if (!listener->reused_node) {
2436                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2437                 list_add(&listener->list, &cm_core->listen_list.list);
2438                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2439                 atomic_inc(&cm_core->listen_node_cnt);
2440         }
2441
2442         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
2443                   " listener = %p, backlog = %d, cm_id = %p.\n",
2444                   cm_info->loc_addr, cm_info->loc_port,
2445                   listener, listener->backlog, listener->cm_id);
2446
2447         return listener;
2448 }
2449
2450
2451 /**
2452  * mini_cm_connect - make a connection node with params
2453  */
2454 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2455                                            struct nes_vnic *nesvnic, u16 private_data_len,
2456                                            void *private_data, struct nes_cm_info *cm_info)
2457 {
2458         int ret = 0;
2459         struct nes_cm_node *cm_node;
2460         struct nes_cm_listener *loopbackremotelistener;
2461         struct nes_cm_node *loopbackremotenode;
2462         struct nes_cm_info loopback_cm_info;
2463         u8 *start_buff;
2464
2465         /* create a CM connection node */
2466         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2467         if (!cm_node)
2468                 return NULL;
2469
2470         /* set our node side to client (active) side */
2471         cm_node->tcp_cntxt.client = 1;
2472         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2473
2474         if (cm_info->loc_addr == cm_info->rem_addr) {
2475                 loopbackremotelistener = find_listener(cm_core,
2476                         cm_node->mapped_loc_addr, cm_node->mapped_rem_port,
2477                         NES_CM_LISTENER_ACTIVE_STATE, 0);
2478                 if (loopbackremotelistener == NULL) {
2479                         create_event(cm_node, NES_CM_EVENT_ABORTED);
2480                 } else {
2481                         loopback_cm_info = *cm_info;
2482                         loopback_cm_info.loc_port = cm_info->rem_port;
2483                         loopback_cm_info.rem_port = cm_info->loc_port;
2484                         loopback_cm_info.mapped_loc_port =
2485                                 cm_info->mapped_rem_port;
2486                         loopback_cm_info.mapped_rem_port =
2487                                 cm_info->mapped_loc_port;
2488                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2489                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
2490                                                           &loopback_cm_info, loopbackremotelistener);
2491                         if (!loopbackremotenode) {
2492                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2493                                 return NULL;
2494                         }
2495                         atomic_inc(&cm_loopbacks);
2496                         loopbackremotenode->loopbackpartner = cm_node;
2497                         loopbackremotenode->tcp_cntxt.rcv_wscale =
2498                                 NES_CM_DEFAULT_RCV_WND_SCALE;
2499                         cm_node->loopbackpartner = loopbackremotenode;
2500                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2501                                private_data_len);
2502                         loopbackremotenode->mpa_frame_size = private_data_len;
2503
2504                         /* we are done handling this state. */
2505                         /* set node to a TSA state */
2506                         cm_node->state = NES_CM_STATE_TSA;
2507                         cm_node->tcp_cntxt.rcv_nxt =
2508                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
2509                         loopbackremotenode->tcp_cntxt.rcv_nxt =
2510                                 cm_node->tcp_cntxt.loc_seq_num;
2511                         cm_node->tcp_cntxt.max_snd_wnd =
2512                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2513                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
2514                                 cm_node->tcp_cntxt.rcv_wnd;
2515                         cm_node->tcp_cntxt.snd_wnd =
2516                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2517                         loopbackremotenode->tcp_cntxt.snd_wnd =
2518                                 cm_node->tcp_cntxt.rcv_wnd;
2519                         cm_node->tcp_cntxt.snd_wscale =
2520                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
2521                         loopbackremotenode->tcp_cntxt.snd_wscale =
2522                                 cm_node->tcp_cntxt.rcv_wscale;
2523                         loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2524                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2525                 }
2526                 return cm_node;
2527         }
2528
2529         start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
2530         cm_node->mpa_frame_size = private_data_len;
2531
2532         memcpy(start_buff, private_data, private_data_len);
2533
2534         /* send a syn and goto syn sent state */
2535         cm_node->state = NES_CM_STATE_SYN_SENT;
2536         ret = send_syn(cm_node, 0, NULL);
2537
2538         if (ret) {
2539                 /* error in sending the syn free up the cm_node struct */
2540                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2541                           "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2542                           cm_node->rem_addr, cm_node->rem_port, cm_node,
2543                           cm_node->cm_id);
2544                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2545                 cm_node = NULL;
2546         }
2547
2548         if (cm_node) {
2549                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2550                           "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2551                           cm_node->rem_addr, cm_node->rem_port, cm_node,
2552                           cm_node->cm_id);
2553         }
2554
2555         return cm_node;
2556 }
2557
2558
2559 /**
2560  * mini_cm_accept - accept a connection
2561  * This function is never called
2562  */
2563 static int mini_cm_accept(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2564 {
2565         return 0;
2566 }
2567
2568
2569 /**
2570  * mini_cm_reject - reject and teardown a connection
2571  */
2572 static int mini_cm_reject(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2573 {
2574         int ret = 0;
2575         int err = 0;
2576         int passive_state;
2577         struct nes_cm_event event;
2578         struct iw_cm_id *cm_id = cm_node->cm_id;
2579         struct nes_cm_node *loopback = cm_node->loopbackpartner;
2580
2581         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2582                   __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2583
2584         if (cm_node->tcp_cntxt.client)
2585                 return ret;
2586         cleanup_retrans_entry(cm_node);
2587
2588         if (!loopback) {
2589                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2590                 if (passive_state == NES_SEND_RESET_EVENT) {
2591                         cm_node->state = NES_CM_STATE_CLOSED;
2592                         rem_ref_cm_node(cm_core, cm_node);
2593                 } else {
2594                         if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2595                                 rem_ref_cm_node(cm_core, cm_node);
2596                         } else {
2597                                 ret = send_mpa_reject(cm_node);
2598                                 if (ret) {
2599                                         cm_node->state = NES_CM_STATE_CLOSED;
2600                                         err = send_reset(cm_node, NULL);
2601                                         if (err)
2602                                                 WARN_ON(1);
2603                                 } else {
2604                                         cm_id->add_ref(cm_id);
2605                                 }
2606                         }
2607                 }
2608         } else {
2609                 cm_node->cm_id = NULL;
2610                 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2611                         rem_ref_cm_node(cm_core, cm_node);
2612                         rem_ref_cm_node(cm_core, loopback);
2613                 } else {
2614                         event.cm_node = loopback;
2615                         event.cm_info.rem_addr = loopback->rem_addr;
2616                         event.cm_info.loc_addr = loopback->loc_addr;
2617                         event.cm_info.rem_port = loopback->rem_port;
2618                         event.cm_info.loc_port = loopback->loc_port;
2619                         event.cm_info.cm_id = loopback->cm_id;
2620                         cm_event_mpa_reject(&event);
2621                         rem_ref_cm_node(cm_core, cm_node);
2622                         loopback->state = NES_CM_STATE_CLOSING;
2623
2624                         cm_id = loopback->cm_id;
2625                         rem_ref_cm_node(cm_core, loopback);
2626                         cm_id->rem_ref(cm_id);
2627                 }
2628         }
2629
2630         return ret;
2631 }
2632
2633
2634 /**
2635  * mini_cm_close
2636  */
2637 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2638 {
2639         int ret = 0;
2640
2641         if (!cm_core || !cm_node)
2642                 return -EINVAL;
2643
2644         switch (cm_node->state) {
2645         case NES_CM_STATE_SYN_RCVD:
2646         case NES_CM_STATE_SYN_SENT:
2647         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2648         case NES_CM_STATE_ESTABLISHED:
2649         case NES_CM_STATE_ACCEPTING:
2650         case NES_CM_STATE_MPAREQ_SENT:
2651         case NES_CM_STATE_MPAREQ_RCVD:
2652                 cleanup_retrans_entry(cm_node);
2653                 send_reset(cm_node, NULL);
2654                 break;
2655         case NES_CM_STATE_CLOSE_WAIT:
2656                 cm_node->state = NES_CM_STATE_LAST_ACK;
2657                 send_fin(cm_node, NULL);
2658                 break;
2659         case NES_CM_STATE_FIN_WAIT1:
2660         case NES_CM_STATE_FIN_WAIT2:
2661         case NES_CM_STATE_LAST_ACK:
2662         case NES_CM_STATE_TIME_WAIT:
2663         case NES_CM_STATE_CLOSING:
2664                 ret = -1;
2665                 break;
2666         case NES_CM_STATE_LISTENING:
2667                 cleanup_retrans_entry(cm_node);
2668                 send_reset(cm_node, NULL);
2669                 break;
2670         case NES_CM_STATE_MPAREJ_RCVD:
2671         case NES_CM_STATE_UNKNOWN:
2672         case NES_CM_STATE_INITED:
2673         case NES_CM_STATE_CLOSED:
2674         case NES_CM_STATE_LISTENER_DESTROYED:
2675                 ret = rem_ref_cm_node(cm_core, cm_node);
2676                 break;
2677         case NES_CM_STATE_TSA:
2678                 if (cm_node->send_entry)
2679                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2680                                "send_entry=%p\n", cm_node->send_entry);
2681                 ret = rem_ref_cm_node(cm_core, cm_node);
2682                 break;
2683         }
2684         return ret;
2685 }
2686
2687
2688 /**
2689  * recv_pkt - recv an ETHERNET packet, and process it through CM
2690  * node state machine
2691  */
2692 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2693                             struct nes_vnic *nesvnic, struct sk_buff *skb)
2694 {
2695         struct nes_cm_node *cm_node = NULL;
2696         struct nes_cm_listener *listener = NULL;
2697         struct iphdr *iph;
2698         struct tcphdr *tcph;
2699         struct nes_cm_info nfo;
2700         int skb_handled = 1;
2701         __be32 tmp_daddr, tmp_saddr;
2702
2703         if (!skb)
2704                 return 0;
2705         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr))
2706                 return 0;
2707
2708         iph = (struct iphdr *)skb->data;
2709         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2710
2711         nfo.loc_addr = ntohl(iph->daddr);
2712         nfo.loc_port = ntohs(tcph->dest);
2713         nfo.rem_addr = ntohl(iph->saddr);
2714         nfo.rem_port = ntohs(tcph->source);
2715
2716         /* If port mapper is available these should be mapped address info */
2717         nfo.mapped_loc_addr = ntohl(iph->daddr);
2718         nfo.mapped_loc_port = ntohs(tcph->dest);
2719         nfo.mapped_rem_addr = ntohl(iph->saddr);
2720         nfo.mapped_rem_port = ntohs(tcph->source);
2721
2722         tmp_daddr = cpu_to_be32(iph->daddr);
2723         tmp_saddr = cpu_to_be32(iph->saddr);
2724
2725         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2726                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2727
2728         do {
2729                 cm_node = find_node(cm_core,
2730                                     nfo.mapped_rem_port, nfo.mapped_rem_addr,
2731                                     nfo.mapped_loc_port, nfo.mapped_loc_addr);
2732
2733                 if (!cm_node) {
2734                         /* Only type of packet accepted are for */
2735                         /* the PASSIVE open (syn only) */
2736                         if ((!tcph->syn) || (tcph->ack)) {
2737                                 skb_handled = 0;
2738                                 break;
2739                         }
2740                         listener = find_listener(cm_core, nfo.mapped_loc_addr,
2741                                         nfo.mapped_loc_port,
2742                                         NES_CM_LISTENER_ACTIVE_STATE, 0);
2743                         if (!listener) {
2744                                 nfo.cm_id = NULL;
2745                                 nfo.conn_type = 0;
2746                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2747                                 skb_handled = 0;
2748                                 break;
2749                         }
2750                         nfo.cm_id = listener->cm_id;
2751                         nfo.conn_type = listener->conn_type;
2752                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2753                                                listener);
2754                         if (!cm_node) {
2755                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2756                                           "node\n");
2757                                 cm_packets_dropped++;
2758                                 atomic_dec(&listener->ref_count);
2759                                 dev_kfree_skb_any(skb);
2760                                 break;
2761                         }
2762                         if (!tcph->rst && !tcph->fin) {
2763                                 cm_node->state = NES_CM_STATE_LISTENING;
2764                         } else {
2765                                 cm_packets_dropped++;
2766                                 rem_ref_cm_node(cm_core, cm_node);
2767                                 dev_kfree_skb_any(skb);
2768                                 break;
2769                         }
2770                         add_ref_cm_node(cm_node);
2771                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2772                         if (cm_node->nesqp->pau_mode)
2773                                 nes_queue_mgt_skbs(skb, nesvnic, cm_node->nesqp);
2774                         else {
2775                                 rem_ref_cm_node(cm_core, cm_node);
2776                                 atomic_inc(&cm_accel_dropped_pkts);
2777                                 dev_kfree_skb_any(skb);
2778                         }
2779                         break;
2780                 }
2781                 skb_reset_network_header(skb);
2782                 skb_set_transport_header(skb, sizeof(*tcph));
2783                 skb->len = ntohs(iph->tot_len);
2784                 process_packet(cm_node, skb, cm_core);
2785                 rem_ref_cm_node(cm_core, cm_node);
2786         } while (0);
2787         return skb_handled;
2788 }
2789
2790
2791 /**
2792  * nes_cm_alloc_core - allocate a top level instance of a cm core
2793  */
2794 static struct nes_cm_core *nes_cm_alloc_core(void)
2795 {
2796         struct nes_cm_core *cm_core;
2797
2798         /* setup the CM core */
2799         /* alloc top level core control structure */
2800         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2801         if (!cm_core)
2802                 return NULL;
2803
2804         INIT_LIST_HEAD(&cm_core->connected_nodes);
2805         init_timer(&cm_core->tcp_timer);
2806         cm_core->tcp_timer.function = nes_cm_timer_tick;
2807
2808         cm_core->mtu = NES_CM_DEFAULT_MTU;
2809         cm_core->state = NES_CM_STATE_INITED;
2810         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2811
2812         atomic_set(&cm_core->events_posted, 0);
2813
2814         cm_core->api = &nes_cm_api;
2815
2816         spin_lock_init(&cm_core->ht_lock);
2817         spin_lock_init(&cm_core->listen_list_lock);
2818
2819         INIT_LIST_HEAD(&cm_core->listen_list.list);
2820
2821         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2822
2823         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2824         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2825         cm_core->post_event = nes_cm_post_event;
2826         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2827         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2828
2829         print_core(cm_core);
2830         return cm_core;
2831 }
2832
2833
2834 /**
2835  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2836  */
2837 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2838 {
2839         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2840
2841         if (!cm_core)
2842                 return -EINVAL;
2843
2844         barrier();
2845
2846         if (timer_pending(&cm_core->tcp_timer))
2847                 del_timer(&cm_core->tcp_timer);
2848
2849         destroy_workqueue(cm_core->event_wq);
2850         destroy_workqueue(cm_core->disconn_wq);
2851         nes_debug(NES_DBG_CM, "\n");
2852         kfree(cm_core);
2853
2854         return 0;
2855 }
2856
2857
2858 /**
2859  * mini_cm_get
2860  */
2861 static int mini_cm_get(struct nes_cm_core *cm_core)
2862 {
2863         return cm_core->state;
2864 }
2865
2866
2867 /**
2868  * mini_cm_set
2869  */
2870 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2871 {
2872         int ret = 0;
2873
2874         switch (type) {
2875         case NES_CM_SET_PKT_SIZE:
2876                 cm_core->mtu = value;
2877                 break;
2878         case NES_CM_SET_FREE_PKT_Q_SIZE:
2879                 cm_core->free_tx_pkt_max = value;
2880                 break;
2881         default:
2882                 /* unknown set option */
2883                 ret = -EINVAL;
2884         }
2885
2886         return ret;
2887 }
2888
2889
2890 /**
2891  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2892  * successfully exchanged when this is called
2893  */
2894 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2895 {
2896         int ret = 0;
2897
2898         if (!nesqp)
2899                 return -EINVAL;
2900
2901         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2902                                                   NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2903                                                   NES_QPCONTEXT_MISC_DROS);
2904
2905         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2906                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2907
2908         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2909
2910         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2911
2912         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2913                 (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2914
2915         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2916                 (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2917                 NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2918
2919         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2920                 (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2921                 NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2922
2923         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2924         nesqp->nesqp_context->ts_recent = 0;
2925         nesqp->nesqp_context->ts_age = 0;
2926         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2927         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2928         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2929         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2930                                                     cm_node->tcp_cntxt.rcv_wscale);
2931         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2932         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2933         nesqp->nesqp_context->srtt = 0;
2934         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2935         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2936         nesqp->nesqp_context->cwnd = cpu_to_le32(2 * cm_node->tcp_cntxt.mss);
2937         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2938         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2939         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2940
2941         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2942                   " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2943                   nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2944                   le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2945                   cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2946                   le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2947                   le32_to_cpu(nesqp->nesqp_context->misc));
2948         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2949         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2950         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2951
2952         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2953         cm_node->state = NES_CM_STATE_TSA;
2954
2955         return ret;
2956 }
2957
2958
2959 /**
2960  * nes_cm_disconn
2961  */
2962 int nes_cm_disconn(struct nes_qp *nesqp)
2963 {
2964         struct disconn_work *work;
2965
2966         work = kzalloc(sizeof *work, GFP_ATOMIC);
2967         if (!work)
2968                 return -ENOMEM;  /* Timer will clean up */
2969
2970         nes_add_ref(&nesqp->ibqp);
2971         work->nesqp = nesqp;
2972         INIT_WORK(&work->work, nes_disconnect_worker);
2973         queue_work(g_cm_core->disconn_wq, &work->work);
2974         return 0;
2975 }
2976
2977
2978 /**
2979  * nes_disconnect_worker
2980  */
2981 static void nes_disconnect_worker(struct work_struct *work)
2982 {
2983         struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2984         struct nes_qp *nesqp = dwork->nesqp;
2985
2986         kfree(dwork);
2987         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2988                   nesqp->last_aeq, nesqp->hwqp.qp_id);
2989         nes_cm_disconn_true(nesqp);
2990         nes_rem_ref(&nesqp->ibqp);
2991 }
2992
2993
2994 /**
2995  * nes_cm_disconn_true
2996  */
2997 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2998 {
2999         unsigned long flags;
3000         int ret = 0;
3001         struct iw_cm_id *cm_id;
3002         struct iw_cm_event cm_event;
3003         struct nes_vnic *nesvnic;
3004         u16 last_ae;
3005         u8 original_hw_tcp_state;
3006         u8 original_ibqp_state;
3007         int disconn_status = 0;
3008         int issue_disconn = 0;
3009         int issue_close = 0;
3010         int issue_flush = 0;
3011         u32 flush_q = NES_CQP_FLUSH_RQ;
3012         struct ib_event ibevent;
3013
3014         if (!nesqp) {
3015                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
3016                 return -1;
3017         }
3018
3019         spin_lock_irqsave(&nesqp->lock, flags);
3020         cm_id = nesqp->cm_id;
3021         /* make sure we havent already closed this connection */
3022         if (!cm_id) {
3023                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
3024                           nesqp->hwqp.qp_id);
3025                 spin_unlock_irqrestore(&nesqp->lock, flags);
3026                 return -1;
3027         }
3028
3029         nesvnic = to_nesvnic(nesqp->ibqp.device);
3030         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
3031
3032         original_hw_tcp_state = nesqp->hw_tcp_state;
3033         original_ibqp_state = nesqp->ibqp_state;
3034         last_ae = nesqp->last_aeq;
3035
3036         if (nesqp->term_flags) {
3037                 issue_disconn = 1;
3038                 issue_close = 1;
3039                 nesqp->cm_id = NULL;
3040                 del_timer(&nesqp->terminate_timer);
3041                 if (nesqp->flush_issued == 0) {
3042                         nesqp->flush_issued = 1;
3043                         issue_flush = 1;
3044                 }
3045         } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
3046                         ((original_ibqp_state == IB_QPS_RTS) &&
3047                         (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
3048                 issue_disconn = 1;
3049                 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
3050                         disconn_status = -ECONNRESET;
3051         }
3052
3053         if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
3054                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
3055                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
3056                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
3057                 issue_close = 1;
3058                 nesqp->cm_id = NULL;
3059                 if (nesqp->flush_issued == 0) {
3060                         nesqp->flush_issued = 1;
3061                         issue_flush = 1;
3062                 }
3063         }
3064
3065         spin_unlock_irqrestore(&nesqp->lock, flags);
3066
3067         if ((issue_flush) && (nesqp->destroyed == 0)) {
3068                 /* Flush the queue(s) */
3069                 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
3070                         flush_q |= NES_CQP_FLUSH_SQ;
3071                 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
3072
3073                 if (nesqp->term_flags) {
3074                         ibevent.device = nesqp->ibqp.device;
3075                         ibevent.event = nesqp->terminate_eventtype;
3076                         ibevent.element.qp = &nesqp->ibqp;
3077                         if (nesqp->ibqp.event_handler)
3078                                 nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
3079                 }
3080         }
3081
3082         if ((cm_id) && (cm_id->event_handler)) {
3083                 if (issue_disconn) {
3084                         atomic_inc(&cm_disconnects);
3085                         cm_event.event = IW_CM_EVENT_DISCONNECT;
3086                         cm_event.status = disconn_status;
3087                         cm_event.local_addr = cm_id->local_addr;
3088                         cm_event.remote_addr = cm_id->remote_addr;
3089                         cm_event.private_data = NULL;
3090                         cm_event.private_data_len = 0;
3091
3092                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
3093                                   " for  QP%u, SQ Head = %u, SQ Tail = %u. "
3094                                   "cm_id = %p, refcount = %u.\n",
3095                                   nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
3096                                   nesqp->hwqp.sq_tail, cm_id,
3097                                   atomic_read(&nesqp->refcount));
3098
3099                         ret = cm_id->event_handler(cm_id, &cm_event);
3100                         if (ret)
3101                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
3102                                           "returned, ret=%d\n", ret);
3103                 }
3104
3105                 if (issue_close) {
3106                         atomic_inc(&cm_closes);
3107                         nes_disconnect(nesqp, 1);
3108
3109                         cm_id->provider_data = nesqp;
3110                         /* Send up the close complete event */
3111                         cm_event.event = IW_CM_EVENT_CLOSE;
3112                         cm_event.status = 0;
3113                         cm_event.provider_data = cm_id->provider_data;
3114                         cm_event.local_addr = cm_id->local_addr;
3115                         cm_event.remote_addr = cm_id->remote_addr;
3116                         cm_event.private_data = NULL;
3117                         cm_event.private_data_len = 0;
3118
3119                         ret = cm_id->event_handler(cm_id, &cm_event);
3120                         if (ret)
3121                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3122
3123                         cm_id->rem_ref(cm_id);
3124                 }
3125         }
3126
3127         return 0;
3128 }
3129
3130
3131 /**
3132  * nes_disconnect
3133  */
3134 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
3135 {
3136         int ret = 0;
3137         struct nes_vnic *nesvnic;
3138         struct nes_device *nesdev;
3139         struct nes_ib_device *nesibdev;
3140
3141         nesvnic = to_nesvnic(nesqp->ibqp.device);
3142         if (!nesvnic)
3143                 return -EINVAL;
3144
3145         nesdev = nesvnic->nesdev;
3146         nesibdev = nesvnic->nesibdev;
3147
3148         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3149                         netdev_refcnt_read(nesvnic->netdev));
3150
3151         if (nesqp->active_conn) {
3152
3153                 /* indicate this connection is NOT active */
3154                 nesqp->active_conn = 0;
3155         } else {
3156                 /* Need to free the Last Streaming Mode Message */
3157                 if (nesqp->ietf_frame) {
3158                         if (nesqp->lsmm_mr)
3159                                 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
3160                         pci_free_consistent(nesdev->pcidev,
3161                                             nesqp->private_data_len + nesqp->ietf_frame_size,
3162                                             nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3163                 }
3164         }
3165
3166         /* close the CM node down if it is still active */
3167         if (nesqp->cm_node) {
3168                 nes_debug(NES_DBG_CM, "Call close API\n");
3169
3170                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
3171         }
3172
3173         return ret;
3174 }
3175
3176
3177 /**
3178  * nes_accept
3179  */
3180 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3181 {
3182         u64 u64temp;
3183         struct ib_qp *ibqp;
3184         struct nes_qp *nesqp;
3185         struct nes_vnic *nesvnic;
3186         struct nes_device *nesdev;
3187         struct nes_cm_node *cm_node;
3188         struct nes_adapter *adapter;
3189         struct ib_qp_attr attr;
3190         struct iw_cm_event cm_event;
3191         struct nes_hw_qp_wqe *wqe;
3192         struct nes_v4_quad nes_quad;
3193         u32 crc_value;
3194         int ret;
3195         int passive_state;
3196         struct nes_ib_device *nesibdev;
3197         struct ib_mr *ibmr = NULL;
3198         struct ib_phys_buf ibphysbuf;
3199         struct nes_pd *nespd;
3200         u64 tagged_offset;
3201         u8 mpa_frame_offset = 0;
3202         struct ietf_mpa_v2 *mpa_v2_frame;
3203         u8 start_addr = 0;
3204         u8 *start_ptr = &start_addr;
3205         u8 **start_buff = &start_ptr;
3206         u16 buff_len = 0;
3207         struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->local_addr;
3208         struct sockaddr_in *raddr = (struct sockaddr_in *)&cm_id->remote_addr;
3209
3210         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3211         if (!ibqp)
3212                 return -EINVAL;
3213
3214         /* get all our handles */
3215         nesqp = to_nesqp(ibqp);
3216         nesvnic = to_nesvnic(nesqp->ibqp.device);
3217         nesdev = nesvnic->nesdev;
3218         adapter = nesdev->nesadapter;
3219
3220         cm_node = (struct nes_cm_node *)cm_id->provider_data;
3221         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
3222                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
3223                 nesvnic->netdev->name);
3224
3225         if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
3226                 if (cm_node->loopbackpartner)
3227                         rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
3228                 rem_ref_cm_node(cm_node->cm_core, cm_node);
3229                 return -EINVAL;
3230         }
3231
3232         passive_state = atomic_add_return(1, &cm_node->passive_state);
3233         if (passive_state == NES_SEND_RESET_EVENT) {
3234                 rem_ref_cm_node(cm_node->cm_core, cm_node);
3235                 return -ECONNRESET;
3236         }
3237         /* associate the node with the QP */
3238         nesqp->cm_node = (void *)cm_node;
3239         cm_node->nesqp = nesqp;
3240
3241
3242         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
3243                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
3244         atomic_inc(&cm_accepts);
3245
3246         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3247                         netdev_refcnt_read(nesvnic->netdev));
3248
3249         nesqp->ietf_frame_size = sizeof(struct ietf_mpa_v2);
3250         /* allocate the ietf frame and space for private data */
3251         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
3252                                                  nesqp->ietf_frame_size + conn_param->private_data_len,
3253                                                  &nesqp->ietf_frame_pbase);
3254
3255         if (!nesqp->ietf_frame) {
3256                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
3257                 return -ENOMEM;
3258         }
3259         mpa_v2_frame = (struct ietf_mpa_v2 *)nesqp->ietf_frame;
3260
3261         if (cm_node->mpa_frame_rev == IETF_MPA_V1)
3262                 mpa_frame_offset = 4;
3263
3264         if (cm_node->mpa_frame_rev == IETF_MPA_V1 ||
3265                         cm_node->mpav2_ird_ord == IETF_NO_IRD_ORD) {
3266                 record_ird_ord(cm_node, (u16)conn_param->ird, (u16)conn_param->ord);
3267         }
3268
3269         memcpy(mpa_v2_frame->priv_data, conn_param->private_data,
3270                conn_param->private_data_len);
3271
3272         cm_build_mpa_frame(cm_node, start_buff, &buff_len, nesqp->ietf_frame, MPA_KEY_REPLY);
3273         nesqp->private_data_len = conn_param->private_data_len;
3274
3275         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
3276         wqe = &nesqp->hwqp.sq_vbase[0];
3277
3278         if (raddr->sin_addr.s_addr != laddr->sin_addr.s_addr) {
3279                 u64temp = (unsigned long)nesqp;
3280                 nesibdev = nesvnic->nesibdev;
3281                 nespd = nesqp->nespd;
3282                 ibphysbuf.addr = nesqp->ietf_frame_pbase + mpa_frame_offset;
3283                 ibphysbuf.size = buff_len;
3284                 tagged_offset = (u64)(unsigned long)*start_buff;
3285                 ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
3286                                                    &ibphysbuf, 1,
3287                                                    IB_ACCESS_LOCAL_WRITE,
3288                                                    &tagged_offset);
3289                 if (!ibmr) {
3290                         nes_debug(NES_DBG_CM, "Unable to register memory region"
3291                                   "for lSMM for cm_node = %p \n",
3292                                   cm_node);
3293                         pci_free_consistent(nesdev->pcidev,
3294                                             nesqp->private_data_len + nesqp->ietf_frame_size,
3295                                             nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3296                         return -ENOMEM;
3297                 }
3298
3299                 ibmr->pd = &nespd->ibpd;
3300                 ibmr->device = nespd->ibpd.device;
3301                 nesqp->lsmm_mr = ibmr;
3302
3303                 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
3304                 set_wqe_64bit_value(wqe->wqe_words,
3305                                     NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
3306                                     u64temp);
3307                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3308                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
3309                                     NES_IWARP_SQ_WQE_WRPDU);
3310                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
3311                         cpu_to_le32(buff_len);
3312                 set_wqe_64bit_value(wqe->wqe_words,
3313                                     NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
3314                                     (u64)(unsigned long)(*start_buff));
3315                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
3316                         cpu_to_le32(buff_len);
3317                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
3318                 if (nesqp->sq_kmapped) {
3319                         nesqp->sq_kmapped = 0;
3320                         kunmap(nesqp->page);
3321                 }
3322
3323                 nesqp->nesqp_context->ird_ord_sizes |=
3324                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3325                                     NES_QPCONTEXT_ORDIRD_WRPDU);
3326         } else {
3327                 nesqp->nesqp_context->ird_ord_sizes |=
3328                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
3329         }
3330         nesqp->skip_lsmm = 1;
3331
3332         /* Cache the cm_id in the qp */
3333         nesqp->cm_id = cm_id;
3334         cm_node->cm_id = cm_id;
3335
3336         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
3337         cm_id->provider_data = nesqp;
3338         nesqp->active_conn = 0;
3339
3340         if (cm_node->state == NES_CM_STATE_TSA)
3341                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
3342                           cm_node);
3343
3344         nes_cm_init_tsa_conn(nesqp, cm_node);
3345
3346         nesqp->nesqp_context->tcpPorts[0] =
3347                                 cpu_to_le16(cm_node->mapped_loc_port);
3348         nesqp->nesqp_context->tcpPorts[1] =
3349                                 cpu_to_le16(cm_node->mapped_rem_port);
3350
3351         nesqp->nesqp_context->ip0 = cpu_to_le32(cm_node->mapped_rem_addr);
3352
3353         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3354                 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3355                 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3356
3357         nesqp->nesqp_context->arp_index_vlan |=
3358                 cpu_to_le32(nes_arp_table(nesdev,
3359                                           le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
3360                                           NES_ARP_RESOLVE) << 16);
3361
3362         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3363                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3364
3365         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3366
3367         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
3368                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
3369         nesqp->nesqp_context->ird_ord_sizes |=
3370                 cpu_to_le32((u32)cm_node->ord_size);
3371
3372         memset(&nes_quad, 0, sizeof(nes_quad));
3373         nes_quad.DstIpAdrIndex =
3374                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3375         nes_quad.SrcIpadr = htonl(cm_node->mapped_rem_addr);
3376         nes_quad.TcpPorts[0] = htons(cm_node->mapped_rem_port);
3377         nes_quad.TcpPorts[1] = htons(cm_node->mapped_loc_port);
3378
3379         /* Produce hash key */
3380         crc_value = get_crc_value(&nes_quad);
3381         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3382         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
3383                   nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
3384
3385         nesqp->hte_index &= adapter->hte_index_mask;
3386         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3387
3388         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3389
3390         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
3391                   "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
3392                   "private data length=%u.\n", nesqp->hwqp.qp_id,
3393                   ntohl(raddr->sin_addr.s_addr), ntohs(raddr->sin_port),
3394                   ntohl(laddr->sin_addr.s_addr), ntohs(laddr->sin_port),
3395                   le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
3396                   le32_to_cpu(nesqp->nesqp_context->snd_nxt),
3397                   buff_len);
3398
3399         /* notify OF layer that accept event was successful */
3400         cm_id->add_ref(cm_id);
3401         nes_add_ref(&nesqp->ibqp);
3402
3403         cm_event.event = IW_CM_EVENT_ESTABLISHED;
3404         cm_event.status = 0;
3405         cm_event.provider_data = (void *)nesqp;
3406         cm_event.local_addr = cm_id->local_addr;
3407         cm_event.remote_addr = cm_id->remote_addr;
3408         cm_event.private_data = NULL;
3409         cm_event.private_data_len = 0;
3410         cm_event.ird = cm_node->ird_size;
3411         cm_event.ord = cm_node->ord_size;
3412
3413         ret = cm_id->event_handler(cm_id, &cm_event);
3414         attr.qp_state = IB_QPS_RTS;
3415         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3416         if (cm_node->loopbackpartner) {
3417                 cm_node->loopbackpartner->mpa_frame_size =
3418                         nesqp->private_data_len;
3419                 /* copy entire MPA frame to our cm_node's frame */
3420                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
3421                        conn_param->private_data, conn_param->private_data_len);
3422                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
3423         }
3424         if (ret)
3425                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3426                        "ret=%d\n", __func__, __LINE__, ret);
3427
3428         return 0;
3429 }
3430
3431
3432 /**
3433  * nes_reject
3434  */
3435 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
3436 {
3437         struct nes_cm_node *cm_node;
3438         struct nes_cm_node *loopback;
3439         struct nes_cm_core *cm_core;
3440         u8 *start_buff;
3441
3442         atomic_inc(&cm_rejects);
3443         cm_node = (struct nes_cm_node *)cm_id->provider_data;
3444         loopback = cm_node->loopbackpartner;
3445         cm_core = cm_node->cm_core;
3446         cm_node->cm_id = cm_id;
3447
3448         if (pdata_len + sizeof(struct ietf_mpa_v2) > MAX_CM_BUFFER)
3449                 return -EINVAL;
3450
3451         if (loopback) {
3452                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3453                 loopback->mpa_frame.priv_data_len = pdata_len;
3454                 loopback->mpa_frame_size = pdata_len;
3455         } else {
3456                 start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
3457                 cm_node->mpa_frame_size = pdata_len;
3458                 memcpy(start_buff, pdata, pdata_len);
3459         }
3460         return cm_core->api->reject(cm_core, cm_node);
3461 }
3462
3463
3464 /**
3465  * nes_connect
3466  * setup and launch cm connect node
3467  */
3468 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3469 {
3470         struct ib_qp *ibqp;
3471         struct nes_qp *nesqp;
3472         struct nes_vnic *nesvnic;
3473         struct nes_device *nesdev;
3474         struct nes_cm_node *cm_node;
3475         struct nes_cm_info cm_info;
3476         int apbvt_set = 0;
3477         struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->local_addr;
3478         struct sockaddr_in *raddr = (struct sockaddr_in *)&cm_id->remote_addr;
3479         struct iwpm_dev_data pm_reg_msg;
3480         struct iwpm_sa_data pm_msg;
3481         int iwpm_err = 0;
3482
3483         if (cm_id->remote_addr.ss_family != AF_INET)
3484                 return -ENOSYS;
3485         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3486         if (!ibqp)
3487                 return -EINVAL;
3488         nesqp = to_nesqp(ibqp);
3489         if (!nesqp)
3490                 return -EINVAL;
3491         nesvnic = to_nesvnic(nesqp->ibqp.device);
3492         if (!nesvnic)
3493                 return -EINVAL;
3494         nesdev = nesvnic->nesdev;
3495         if (!nesdev)
3496                 return -EINVAL;
3497
3498         if (!laddr->sin_port || !raddr->sin_port)
3499                 return -EINVAL;
3500
3501         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3502                   "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3503                   ntohl(nesvnic->local_ipaddr), ntohl(raddr->sin_addr.s_addr),
3504                   ntohs(raddr->sin_port), ntohl(laddr->sin_addr.s_addr),
3505                   ntohs(laddr->sin_port));
3506
3507         atomic_inc(&cm_connects);
3508         nesqp->active_conn = 1;
3509
3510         /* cache the cm_id in the qp */
3511         nesqp->cm_id = cm_id;
3512         cm_id->provider_data = nesqp;
3513         nesqp->private_data_len = conn_param->private_data_len;
3514
3515         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3516         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3517                   conn_param->private_data_len);
3518
3519         /* set up the connection params for the node */
3520         cm_info.loc_addr = ntohl(laddr->sin_addr.s_addr);
3521         cm_info.loc_port = ntohs(laddr->sin_port);
3522         cm_info.rem_addr = ntohl(raddr->sin_addr.s_addr);
3523         cm_info.rem_port = ntohs(raddr->sin_port);
3524         cm_info.cm_id = cm_id;
3525         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3526
3527         /* No port mapper available, go with the specified peer information */
3528         cm_info.mapped_loc_addr = cm_info.loc_addr;
3529         cm_info.mapped_loc_port = cm_info.loc_port;
3530         cm_info.mapped_rem_addr = cm_info.rem_addr;
3531         cm_info.mapped_rem_port = cm_info.rem_port;
3532
3533         nes_form_reg_msg(nesvnic, &pm_reg_msg);
3534         iwpm_err = iwpm_register_pid(&pm_reg_msg, RDMA_NL_NES);
3535         if (iwpm_err) {
3536                 nes_debug(NES_DBG_NLMSG,
3537                         "Port Mapper reg pid fail (err = %d).\n", iwpm_err);
3538         }
3539         if (iwpm_valid_pid() && !iwpm_err) {
3540                 nes_form_pm_msg(&cm_info, &pm_msg);
3541                 iwpm_err = iwpm_add_and_query_mapping(&pm_msg, RDMA_NL_NES);
3542                 if (iwpm_err)
3543                         nes_debug(NES_DBG_NLMSG,
3544                         "Port Mapper query fail (err = %d).\n", iwpm_err);
3545                 else
3546                         nes_record_pm_msg(&cm_info, &pm_msg);
3547         }
3548
3549         if (laddr->sin_addr.s_addr != raddr->sin_addr.s_addr) {
3550                 nes_manage_apbvt(nesvnic, cm_info.mapped_loc_port,
3551                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3552                 apbvt_set = 1;
3553         }
3554
3555         if (nes_create_mapinfo(&cm_info))
3556                 return -ENOMEM;
3557
3558         cm_id->add_ref(cm_id);
3559
3560         /* create a connect CM node connection */
3561         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3562                                           conn_param->private_data_len, (void *)conn_param->private_data,
3563                                           &cm_info);
3564         if (!cm_node) {
3565                 if (apbvt_set)
3566                         nes_manage_apbvt(nesvnic, cm_info.mapped_loc_port,
3567                                          PCI_FUNC(nesdev->pcidev->devfn),
3568                                          NES_MANAGE_APBVT_DEL);
3569
3570                 nes_debug(NES_DBG_NLMSG, "Delete mapped_loc_port = %04X\n",
3571                                 cm_info.mapped_loc_port);
3572                 nes_remove_mapinfo(cm_info.loc_addr, cm_info.loc_port,
3573                         cm_info.mapped_loc_addr, cm_info.mapped_loc_port);
3574                 cm_id->rem_ref(cm_id);
3575                 return -ENOMEM;
3576         }
3577
3578         record_ird_ord(cm_node, (u16)conn_param->ird, (u16)conn_param->ord);
3579         if (cm_node->send_rdma0_op == SEND_RDMA_READ_ZERO &&
3580                                 cm_node->ord_size == 0)
3581                 cm_node->ord_size = 1;
3582
3583         cm_node->apbvt_set = apbvt_set;
3584         nesqp->cm_node = cm_node;
3585         cm_node->nesqp = nesqp;
3586         nes_add_ref(&nesqp->ibqp);
3587
3588         return 0;
3589 }
3590
3591
3592 /**
3593  * nes_create_listen
3594  */
3595 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3596 {
3597         struct nes_vnic *nesvnic;
3598         struct nes_cm_listener *cm_node;
3599         struct nes_cm_info cm_info;
3600         int err;
3601         struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->local_addr;
3602
3603         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3604                   cm_id, ntohs(laddr->sin_port));
3605
3606         if (cm_id->local_addr.ss_family != AF_INET)
3607                 return -ENOSYS;
3608         nesvnic = to_nesvnic(cm_id->device);
3609         if (!nesvnic)
3610                 return -EINVAL;
3611
3612         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3613                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3614
3615         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3616                         nesvnic->local_ipaddr, laddr->sin_addr.s_addr);
3617
3618         /* setup listen params in our api call struct */
3619         cm_info.loc_addr = ntohl(nesvnic->local_ipaddr);
3620         cm_info.loc_port = ntohs(laddr->sin_port);
3621         cm_info.backlog = backlog;
3622         cm_info.cm_id = cm_id;
3623
3624         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3625
3626         /* No port mapper available, go with the specified info */
3627         cm_info.mapped_loc_addr = cm_info.loc_addr;
3628         cm_info.mapped_loc_port = cm_info.loc_port;
3629
3630         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3631         if (!cm_node) {
3632                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3633                        __func__, __LINE__);
3634                 return -ENOMEM;
3635         }
3636
3637         cm_id->provider_data = cm_node;
3638
3639         if (!cm_node->reused_node) {
3640                 if (nes_create_mapinfo(&cm_info))
3641                         return -ENOMEM;
3642
3643                 err = nes_manage_apbvt(nesvnic, cm_node->mapped_loc_port,
3644                                        PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3645                                        NES_MANAGE_APBVT_ADD);
3646                 if (err) {
3647                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3648                                err);
3649                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3650                         return err;
3651                 }
3652                 atomic_inc(&cm_listens_created);
3653         }
3654
3655         cm_id->add_ref(cm_id);
3656         cm_id->provider_data = (void *)cm_node;
3657
3658
3659         return 0;
3660 }
3661
3662
3663 /**
3664  * nes_destroy_listen
3665  */
3666 int nes_destroy_listen(struct iw_cm_id *cm_id)
3667 {
3668         if (cm_id->provider_data)
3669                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3670         else
3671                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3672
3673         cm_id->rem_ref(cm_id);
3674
3675         return 0;
3676 }
3677
3678
3679 /**
3680  * nes_cm_recv
3681  */
3682 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3683 {
3684         int rc = 0;
3685
3686         cm_packets_received++;
3687         if ((g_cm_core) && (g_cm_core->api))
3688                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3689         else
3690                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3691                           " cm is not setup properly.\n");
3692
3693         return rc;
3694 }
3695
3696
3697 /**
3698  * nes_cm_start
3699  * Start and init a cm core module
3700  */
3701 int nes_cm_start(void)
3702 {
3703         nes_debug(NES_DBG_CM, "\n");
3704         /* create the primary CM core, pass this handle to subsequent core inits */
3705         g_cm_core = nes_cm_alloc_core();
3706         if (g_cm_core)
3707                 return 0;
3708         else
3709                 return -ENOMEM;
3710 }
3711
3712
3713 /**
3714  * nes_cm_stop
3715  * stop and dealloc all cm core instances
3716  */
3717 int nes_cm_stop(void)
3718 {
3719         g_cm_core->api->destroy_cm_core(g_cm_core);
3720         return 0;
3721 }
3722
3723
3724 /**
3725  * cm_event_connected
3726  * handle a connected event, setup QPs and HW
3727  */
3728 static void cm_event_connected(struct nes_cm_event *event)
3729 {
3730         struct nes_qp *nesqp;
3731         struct nes_vnic *nesvnic;
3732         struct nes_device *nesdev;
3733         struct nes_cm_node *cm_node;
3734         struct nes_adapter *nesadapter;
3735         struct ib_qp_attr attr;
3736         struct iw_cm_id *cm_id;
3737         struct iw_cm_event cm_event;
3738         struct nes_v4_quad nes_quad;
3739         u32 crc_value;
3740         int ret;
3741         struct sockaddr_in *laddr;
3742         struct sockaddr_in *raddr;
3743         struct sockaddr_in *cm_event_laddr;
3744
3745         /* get all our handles */
3746         cm_node = event->cm_node;
3747         cm_id = cm_node->cm_id;
3748         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3749         nesqp = (struct nes_qp *)cm_id->provider_data;
3750         nesvnic = to_nesvnic(nesqp->ibqp.device);
3751         nesdev = nesvnic->nesdev;
3752         nesadapter = nesdev->nesadapter;
3753         laddr = (struct sockaddr_in *)&cm_id->local_addr;
3754         raddr = (struct sockaddr_in *)&cm_id->remote_addr;
3755         cm_event_laddr = (struct sockaddr_in *)&cm_event.local_addr;
3756
3757         if (nesqp->destroyed)
3758                 return;
3759         atomic_inc(&cm_connecteds);
3760         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3761                   " local port 0x%04X. jiffies = %lu.\n",
3762                   nesqp->hwqp.qp_id, ntohl(raddr->sin_addr.s_addr),
3763                   ntohs(raddr->sin_port), ntohs(laddr->sin_port), jiffies);
3764
3765         nes_cm_init_tsa_conn(nesqp, cm_node);
3766
3767         /* set the QP tsa context */
3768         nesqp->nesqp_context->tcpPorts[0] =
3769                         cpu_to_le16(cm_node->mapped_loc_port);
3770         nesqp->nesqp_context->tcpPorts[1] =
3771                         cpu_to_le16(cm_node->mapped_rem_port);
3772         nesqp->nesqp_context->ip0 = cpu_to_le32(cm_node->mapped_rem_addr);
3773
3774         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3775                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3776                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3777         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3778                         nes_arp_table(nesdev,
3779                         le32_to_cpu(nesqp->nesqp_context->ip0),
3780                         NULL, NES_ARP_RESOLVE) << 16);
3781         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3782                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3783         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3784         nesqp->nesqp_context->ird_ord_sizes |=
3785                         cpu_to_le32((u32)1 <<
3786                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3787         nesqp->nesqp_context->ird_ord_sizes |=
3788                         cpu_to_le32((u32)cm_node->ord_size);
3789
3790         /* Adjust tail for not having a LSMM */
3791         /*nesqp->hwqp.sq_tail = 1;*/
3792
3793         build_rdma0_msg(cm_node, &nesqp);
3794
3795         nes_write32(nesdev->regs + NES_WQE_ALLOC,
3796                     (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3797
3798         memset(&nes_quad, 0, sizeof(nes_quad));
3799
3800         nes_quad.DstIpAdrIndex =
3801                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3802         nes_quad.SrcIpadr = htonl(cm_node->mapped_rem_addr);
3803         nes_quad.TcpPorts[0] = htons(cm_node->mapped_rem_port);
3804         nes_quad.TcpPorts[1] = htons(cm_node->mapped_loc_port);
3805
3806         /* Produce hash key */
3807         crc_value = get_crc_value(&nes_quad);
3808         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3809         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3810                   nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3811
3812         nesqp->hte_index &= nesadapter->hte_index_mask;
3813         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3814
3815         nesqp->ietf_frame = &cm_node->mpa_frame;
3816         nesqp->private_data_len = (u8)cm_node->mpa_frame_size;
3817         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3818
3819         /* notify OF layer we successfully created the requested connection */
3820         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3821         cm_event.status = 0;
3822         cm_event.provider_data = cm_id->provider_data;
3823         cm_event_laddr->sin_family = AF_INET;
3824         cm_event_laddr->sin_port = laddr->sin_port;
3825         cm_event.remote_addr = cm_id->remote_addr;
3826
3827         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3828         cm_event.private_data_len = (u8)event->cm_node->mpa_frame_size;
3829         cm_event.ird = cm_node->ird_size;
3830         cm_event.ord = cm_node->ord_size;
3831
3832         cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3833         ret = cm_id->event_handler(cm_id, &cm_event);
3834         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3835
3836         if (ret)
3837                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3838                        "ret=%d\n", __func__, __LINE__, ret);
3839         attr.qp_state = IB_QPS_RTS;
3840         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3841
3842         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3843                   "%lu\n", nesqp->hwqp.qp_id, jiffies);
3844
3845         return;
3846 }
3847
3848
3849 /**
3850  * cm_event_connect_error
3851  */
3852 static void cm_event_connect_error(struct nes_cm_event *event)
3853 {
3854         struct nes_qp *nesqp;
3855         struct iw_cm_id *cm_id;
3856         struct iw_cm_event cm_event;
3857         /* struct nes_cm_info cm_info; */
3858         int ret;
3859
3860         if (!event->cm_node)
3861                 return;
3862
3863         cm_id = event->cm_node->cm_id;
3864         if (!cm_id)
3865                 return;
3866
3867         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3868         nesqp = cm_id->provider_data;
3869
3870         if (!nesqp)
3871                 return;
3872
3873         /* notify OF layer about this connection error event */
3874         /* cm_id->rem_ref(cm_id); */
3875         nesqp->cm_id = NULL;
3876         cm_id->provider_data = NULL;
3877         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3878         cm_event.status = -ECONNRESET;
3879         cm_event.provider_data = cm_id->provider_data;
3880         cm_event.local_addr = cm_id->local_addr;
3881         cm_event.remote_addr = cm_id->remote_addr;
3882         cm_event.private_data = NULL;
3883         cm_event.private_data_len = 0;
3884
3885 #ifdef CONFIG_INFINIBAND_NES_DEBUG
3886         {
3887                 struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
3888                                                      &cm_event.local_addr;
3889                 struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
3890                                                      &cm_event.remote_addr;
3891                 nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, remote_addr=%08x\n",
3892                           cm_event_laddr->sin_addr.s_addr, cm_event_raddr->sin_addr.s_addr);
3893         }
3894 #endif
3895
3896         ret = cm_id->event_handler(cm_id, &cm_event);
3897         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3898         if (ret)
3899                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3900                        "ret=%d\n", __func__, __LINE__, ret);
3901         cm_id->rem_ref(cm_id);
3902
3903         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3904         return;
3905 }
3906
3907
3908 /**
3909  * cm_event_reset
3910  */
3911 static void cm_event_reset(struct nes_cm_event *event)
3912 {
3913         struct nes_qp *nesqp;
3914         struct iw_cm_id *cm_id;
3915         struct iw_cm_event cm_event;
3916         /* struct nes_cm_info cm_info; */
3917         int ret;
3918
3919         if (!event->cm_node)
3920                 return;
3921
3922         if (!event->cm_node->cm_id)
3923                 return;
3924
3925         cm_id = event->cm_node->cm_id;
3926
3927         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3928         nesqp = cm_id->provider_data;
3929         if (!nesqp)
3930                 return;
3931
3932         nesqp->cm_id = NULL;
3933         /* cm_id->provider_data = NULL; */
3934         cm_event.event = IW_CM_EVENT_DISCONNECT;
3935         cm_event.status = -ECONNRESET;
3936         cm_event.provider_data = cm_id->provider_data;
3937         cm_event.local_addr = cm_id->local_addr;
3938         cm_event.remote_addr = cm_id->remote_addr;
3939         cm_event.private_data = NULL;
3940         cm_event.private_data_len = 0;
3941
3942         cm_id->add_ref(cm_id);
3943         ret = cm_id->event_handler(cm_id, &cm_event);
3944         atomic_inc(&cm_closes);
3945         cm_event.event = IW_CM_EVENT_CLOSE;
3946         cm_event.status = 0;
3947         cm_event.provider_data = cm_id->provider_data;
3948         cm_event.local_addr = cm_id->local_addr;
3949         cm_event.remote_addr = cm_id->remote_addr;
3950         cm_event.private_data = NULL;
3951         cm_event.private_data_len = 0;
3952         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3953         ret = cm_id->event_handler(cm_id, &cm_event);
3954
3955         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3956
3957
3958         /* notify OF layer about this connection error event */
3959         cm_id->rem_ref(cm_id);
3960
3961         return;
3962 }
3963
3964
3965 /**
3966  * cm_event_mpa_req
3967  */
3968 static void cm_event_mpa_req(struct nes_cm_event *event)
3969 {
3970         struct iw_cm_id *cm_id;
3971         struct iw_cm_event cm_event;
3972         int ret;
3973         struct nes_cm_node *cm_node;
3974         struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
3975                                              &cm_event.local_addr;
3976         struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
3977                                              &cm_event.remote_addr;
3978
3979         cm_node = event->cm_node;
3980         if (!cm_node)
3981                 return;
3982         cm_id = cm_node->cm_id;
3983
3984         atomic_inc(&cm_connect_reqs);
3985         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3986                   cm_node, cm_id, jiffies);
3987
3988         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3989         cm_event.status = 0;
3990         cm_event.provider_data = (void *)cm_node;
3991
3992         cm_event_laddr->sin_family = AF_INET;
3993         cm_event_laddr->sin_port = htons(event->cm_info.loc_port);
3994         cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3995
3996         cm_event_raddr->sin_family = AF_INET;
3997         cm_event_raddr->sin_port = htons(event->cm_info.rem_port);
3998         cm_event_raddr->sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3999         cm_event.private_data = cm_node->mpa_frame_buf;
4000         cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
4001         if (cm_node->mpa_frame_rev == IETF_MPA_V1) {
4002                 cm_event.ird = NES_MAX_IRD;
4003                 cm_event.ord = NES_MAX_ORD;
4004         } else {
4005         cm_event.ird = cm_node->ird_size;
4006         cm_event.ord = cm_node->ord_size;
4007         }
4008
4009         ret = cm_id->event_handler(cm_id, &cm_event);
4010         if (ret)
4011                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
4012                        __func__, __LINE__, ret);
4013         return;
4014 }
4015
4016
4017 static void cm_event_mpa_reject(struct nes_cm_event *event)
4018 {
4019         struct iw_cm_id *cm_id;
4020         struct iw_cm_event cm_event;
4021         struct nes_cm_node *cm_node;
4022         int ret;
4023         struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
4024                                              &cm_event.local_addr;
4025         struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
4026                                              &cm_event.remote_addr;
4027
4028         cm_node = event->cm_node;
4029         if (!cm_node)
4030                 return;
4031         cm_id = cm_node->cm_id;
4032
4033         atomic_inc(&cm_connect_reqs);
4034         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
4035                   cm_node, cm_id, jiffies);
4036
4037         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
4038         cm_event.status = -ECONNREFUSED;
4039         cm_event.provider_data = cm_id->provider_data;
4040
4041         cm_event_laddr->sin_family = AF_INET;
4042         cm_event_laddr->sin_port = htons(event->cm_info.loc_port);
4043         cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.loc_addr);
4044
4045         cm_event_raddr->sin_family = AF_INET;
4046         cm_event_raddr->sin_port = htons(event->cm_info.rem_port);
4047         cm_event_raddr->sin_addr.s_addr = htonl(event->cm_info.rem_addr);
4048
4049         cm_event.private_data = cm_node->mpa_frame_buf;
4050         cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
4051
4052         nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
4053                   "remove_addr=%08x\n",
4054                   cm_event_laddr->sin_addr.s_addr,
4055                   cm_event_raddr->sin_addr.s_addr);
4056
4057         ret = cm_id->event_handler(cm_id, &cm_event);
4058         if (ret)
4059                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
4060                        __func__, __LINE__, ret);
4061
4062         return;
4063 }
4064
4065
4066 static void nes_cm_event_handler(struct work_struct *);
4067
4068 /**
4069  * nes_cm_post_event
4070  * post an event to the cm event handler
4071  */
4072 static int nes_cm_post_event(struct nes_cm_event *event)
4073 {
4074         atomic_inc(&event->cm_node->cm_core->events_posted);
4075         add_ref_cm_node(event->cm_node);
4076         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
4077         INIT_WORK(&event->event_work, nes_cm_event_handler);
4078         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
4079                   event->cm_node, event);
4080
4081         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
4082
4083         nes_debug(NES_DBG_CM, "Exit\n");
4084         return 0;
4085 }
4086
4087
4088 /**
4089  * nes_cm_event_handler
4090  * worker function to handle cm events
4091  * will free instance of nes_cm_event
4092  */
4093 static void nes_cm_event_handler(struct work_struct *work)
4094 {
4095         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
4096                                                   event_work);
4097         struct nes_cm_core *cm_core;
4098
4099         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
4100                 return;
4101
4102         cm_core = event->cm_node->cm_core;
4103         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
4104                   event, event->type, atomic_read(&cm_core->events_posted));
4105
4106         switch (event->type) {
4107         case NES_CM_EVENT_MPA_REQ:
4108                 cm_event_mpa_req(event);
4109                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
4110                           event->cm_node);
4111                 break;
4112         case NES_CM_EVENT_RESET:
4113                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
4114                           event->cm_node);
4115                 cm_event_reset(event);
4116                 break;
4117         case NES_CM_EVENT_CONNECTED:
4118                 if ((!event->cm_node->cm_id) ||
4119                     (event->cm_node->state != NES_CM_STATE_TSA))
4120                         break;
4121                 cm_event_connected(event);
4122                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
4123                 break;
4124         case NES_CM_EVENT_MPA_REJECT:
4125                 if ((!event->cm_node->cm_id) ||
4126                     (event->cm_node->state == NES_CM_STATE_TSA))
4127                         break;
4128                 cm_event_mpa_reject(event);
4129                 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
4130                 break;
4131
4132         case NES_CM_EVENT_ABORTED:
4133                 if ((!event->cm_node->cm_id) ||
4134                     (event->cm_node->state == NES_CM_STATE_TSA))
4135                         break;
4136                 cm_event_connect_error(event);
4137                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
4138                 break;
4139         case NES_CM_EVENT_DROPPED_PKT:
4140                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
4141                 break;
4142         default:
4143                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
4144                 break;
4145         }
4146
4147         atomic_dec(&cm_core->events_posted);
4148         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
4149         rem_ref_cm_node(cm_core, event->cm_node);
4150         kfree(event);
4151
4152         return;
4153 }