drivers/infiniband/core/iwcm.c

   1 /*
   2  * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
   3  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   4  * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
   5  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   6  * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
   7  * Copyright (c) 2005 Network Appliance, Inc. All rights reserved.
   8  *
   9  * This software is available to you under a choice of one of two
  10  * licenses.  You may choose to be licensed under the terms of the GNU
  11  * General Public License (GPL) Version 2, available from the file
  12  * COPYING in the main directory of this source tree, or the
  13  * OpenIB.org BSD license below:
  14  *
  15  *     Redistribution and use in source and binary forms, with or
  16  *     without modification, are permitted provided that the following
  17  *     conditions are met:
  18  *
  19  *      - Redistributions of source code must retain the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer.
  22  *
  23  *      - Redistributions in binary form must reproduce the above
  24  *        copyright notice, this list of conditions and the following
  25  *        disclaimer in the documentation and/or other materials
  26  *        provided with the distribution.
  27  *
  28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  32  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  33  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  34  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  35  * SOFTWARE.
  36  *
  37  */
  38 #include <linux/dma-mapping.h>
  39 #include <linux/err.h>
  40 #include <linux/idr.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/rbtree.h>
  43 #include <linux/sched.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/workqueue.h>
  46 #include <linux/completion.h>
  47 #include <linux/slab.h>
  48 #include <linux/module.h>
  49 #include <linux/sysctl.h>
  50
  51 #include <rdma/iw_cm.h>
  52 #include <rdma/ib_addr.h>
  53 #include <rdma/iw_portmap.h>
  54 #include <rdma/rdma_netlink.h>
  55
  56 #include "iwcm.h"
  57
  58 MODULE_AUTHOR("Tom Tucker");
  59 MODULE_DESCRIPTION("iWARP CM");
  60 MODULE_LICENSE("Dual BSD/GPL");
  61
  62 static const char * const iwcm_rej_reason_strs[] = {
  63         [ECONNRESET]                    = "reset by remote host",
  64         [ECONNREFUSED]                  = "refused by remote application",
  65         [ETIMEDOUT]                     = "setup timeout",
  66 };
  67
  68 const char *__attribute_const__ iwcm_reject_msg(int reason)
  69 {
  70         size_t index;
  71
  72         /* iWARP uses negative errnos */
  73         index = -reason;
  74
  75         if (index < ARRAY_SIZE(iwcm_rej_reason_strs) &&
  76             iwcm_rej_reason_strs[index])
  77                 return iwcm_rej_reason_strs[index];
  78         else
  79                 return "unrecognized reason";
  80 }
  81 EXPORT_SYMBOL(iwcm_reject_msg);
  82
  83 static struct rdma_nl_cbs iwcm_nl_cb_table[RDMA_NL_IWPM_NUM_OPS] = {
  84         [RDMA_NL_IWPM_REG_PID] = {.dump = iwpm_register_pid_cb},
  85         [RDMA_NL_IWPM_ADD_MAPPING] = {.dump = iwpm_add_mapping_cb},
  86         [RDMA_NL_IWPM_QUERY_MAPPING] = {.dump = iwpm_add_and_query_mapping_cb},
  87         [RDMA_NL_IWPM_REMOTE_INFO] = {.dump = iwpm_remote_info_cb},
  88         [RDMA_NL_IWPM_HANDLE_ERR] = {.dump = iwpm_mapping_error_cb},
  89         [RDMA_NL_IWPM_MAPINFO] = {.dump = iwpm_mapping_info_cb},
  90         [RDMA_NL_IWPM_MAPINFO_NUM] = {.dump = iwpm_ack_mapping_info_cb}
  91 };
  92
  93 static struct workqueue_struct *iwcm_wq;
  94 struct iwcm_work {
  95         struct work_struct work;
  96         struct iwcm_id_private *cm_id;
  97         struct list_head list;
  98         struct iw_cm_event event;
  99         struct list_head free_list;
 100 };
 101
 102 static unsigned int default_backlog = 256;
 103
 104 static struct ctl_table_header *iwcm_ctl_table_hdr;
 105 static struct ctl_table iwcm_ctl_table[] = {
 106         {
 107                 .procname       = "default_backlog",
 108                 .data           = &default_backlog,
 109                 .maxlen         = sizeof(default_backlog),
 110                 .mode           = 0644,
 111                 .proc_handler   = proc_dointvec,
 112         },
 113         { }
 114 };
 115
 116 /*
 117  * The following services provide a mechanism for pre-allocating iwcm_work
 118  * elements.  The design pre-allocates them  based on the cm_id type:
 119  *      LISTENING IDS:  Get enough elements preallocated to handle the
 120  *                      listen backlog.
 121  *      ACTIVE IDS:     4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE
 122  *      PASSIVE IDS:    3: ESTABLISHED, DISCONNECT, CLOSE
 123  *
 124  * Allocating them in connect and listen avoids having to deal
 125  * with allocation failures on the event upcall from the provider (which
 126  * is called in the interrupt context).
 127  *
 128  * One exception is when creating the cm_id for incoming connection requests.
 129  * There are two cases:
 130  * 1) in the event upcall, cm_event_handler(), for a listening cm_id.  If
 131  *    the backlog is exceeded, then no more connection request events will
 132  *    be processed.  cm_event_handler() returns -ENOMEM in this case.  Its up
 133  *    to the provider to reject the connection request.
 134  * 2) in the connection request workqueue handler, cm_conn_req_handler().
 135  *    If work elements cannot be allocated for the new connect request cm_id,
 136  *    then IWCM will call the provider reject method.  This is ok since
 137  *    cm_conn_req_handler() runs in the workqueue thread context.
 138  */
 139
 140 static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv)
 141 {
 142         struct iwcm_work *work;
 143
 144         if (list_empty(&cm_id_priv->work_free_list))
 145                 return NULL;
 146         work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work,
 147                           free_list);
 148         list_del_init(&work->free_list);
 149         return work;
 150 }
 151
 152 static void put_work(struct iwcm_work *work)
 153 {
 154         list_add(&work->free_list, &work->cm_id->work_free_list);
 155 }
 156
 157 static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv)
 158 {
 159         struct list_head *e, *tmp;
 160
 161         list_for_each_safe(e, tmp, &cm_id_priv->work_free_list)
 162                 kfree(list_entry(e, struct iwcm_work, free_list));
 163 }
 164
 165 static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count)
 166 {
 167         struct iwcm_work *work;
 168
 169         BUG_ON(!list_empty(&cm_id_priv->work_free_list));
 170         while (count--) {
 171                 work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL);
 172                 if (!work) {
 173                         dealloc_work_entries(cm_id_priv);
 174                         return -ENOMEM;
 175                 }
 176                 work->cm_id = cm_id_priv;
 177                 INIT_LIST_HEAD(&work->list);
 178                 put_work(work);
 179         }
 180         return 0;
 181 }
 182
 183 /*
 184  * Save private data from incoming connection requests to
 185  * iw_cm_event, so the low level driver doesn't have to. Adjust
 186  * the event ptr to point to the local copy.
 187  */
 188 static int copy_private_data(struct iw_cm_event *event)
 189 {
 190         void *p;
 191
 192         p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC);
 193         if (!p)
 194                 return -ENOMEM;
 195         event->private_data = p;
 196         return 0;
 197 }
 198
 199 static void free_cm_id(struct iwcm_id_private *cm_id_priv)
 200 {
 201         dealloc_work_entries(cm_id_priv);
 202         kfree(cm_id_priv);
 203 }
 204
 205 /*
 206  * Release a reference on cm_id. If the last reference is being
 207  * released, free the cm_id and return 1.
 208  */
 209 static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
 210 {
 211         BUG_ON(atomic_read(&cm_id_priv->refcount)==0);
 212         if (atomic_dec_and_test(&cm_id_priv->refcount)) {
 213                 BUG_ON(!list_empty(&cm_id_priv->work_list));
 214                 free_cm_id(cm_id_priv);
 215                 return 1;
 216         }
 217
 218         return 0;
 219 }
 220
 221 static void add_ref(struct iw_cm_id *cm_id)
 222 {
 223         struct iwcm_id_private *cm_id_priv;
 224         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 225         atomic_inc(&cm_id_priv->refcount);
 226 }
 227
 228 static void rem_ref(struct iw_cm_id *cm_id)
 229 {
 230         struct iwcm_id_private *cm_id_priv;
 231
 232         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 233
 234         (void)iwcm_deref_id(cm_id_priv);
 235 }
 236
 237 static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event);
 238
 239 struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
 240                                  iw_cm_handler cm_handler,
 241                                  void *context)
 242 {
 243         struct iwcm_id_private *cm_id_priv;
 244
 245         cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL);
 246         if (!cm_id_priv)
 247                 return ERR_PTR(-ENOMEM);
 248
 249         cm_id_priv->state = IW_CM_STATE_IDLE;
 250         cm_id_priv->id.device = device;
 251         cm_id_priv->id.cm_handler = cm_handler;
 252         cm_id_priv->id.context = context;
 253         cm_id_priv->id.event_handler = cm_event_handler;
 254         cm_id_priv->id.add_ref = add_ref;
 255         cm_id_priv->id.rem_ref = rem_ref;
 256         spin_lock_init(&cm_id_priv->lock);
 257         atomic_set(&cm_id_priv->refcount, 1);
 258         init_waitqueue_head(&cm_id_priv->connect_wait);
 259         init_completion(&cm_id_priv->destroy_comp);
 260         INIT_LIST_HEAD(&cm_id_priv->work_list);
 261         INIT_LIST_HEAD(&cm_id_priv->work_free_list);
 262
 263         return &cm_id_priv->id;
 264 }
 265 EXPORT_SYMBOL(iw_create_cm_id);
 266
 267
 268 static int iwcm_modify_qp_err(struct ib_qp *qp)
 269 {
 270         struct ib_qp_attr qp_attr;
 271
 272         if (!qp)
 273                 return -EINVAL;
 274
 275         qp_attr.qp_state = IB_QPS_ERR;
 276         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 277 }
 278
 279 /*
 280  * This is really the RDMAC CLOSING state. It is most similar to the
 281  * IB SQD QP state.
 282  */
 283 static int iwcm_modify_qp_sqd(struct ib_qp *qp)
 284 {
 285         struct ib_qp_attr qp_attr;
 286
 287         BUG_ON(qp == NULL);
 288         qp_attr.qp_state = IB_QPS_SQD;
 289         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 290 }
 291
 292 /*
 293  * CM_ID <-- CLOSING
 294  *
 295  * Block if a passive or active connection is currently being processed. Then
 296  * process the event as follows:
 297  * - If we are ESTABLISHED, move to CLOSING and modify the QP state
 298  *   based on the abrupt flag
 299  * - If the connection is already in the CLOSING or IDLE state, the peer is
 300  *   disconnecting concurrently with us and we've already seen the
 301  *   DISCONNECT event -- ignore the request and return 0
 302  * - Disconnect on a listening endpoint returns -EINVAL
 303  */
 304 int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt)
 305 {
 306         struct iwcm_id_private *cm_id_priv;
 307         unsigned long flags;
 308         int ret = 0;
 309         struct ib_qp *qp = NULL;
 310
 311         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 312         /* Wait if we're currently in a connect or accept downcall */
 313         wait_event(cm_id_priv->connect_wait,
 314                    !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 315
 316         spin_lock_irqsave(&cm_id_priv->lock, flags);
 317         switch (cm_id_priv->state) {
 318         case IW_CM_STATE_ESTABLISHED:
 319                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 320
 321                 /* QP could be <nul> for user-mode client */
 322                 if (cm_id_priv->qp)
 323                         qp = cm_id_priv->qp;
 324                 else
 325                         ret = -EINVAL;
 326                 break;
 327         case IW_CM_STATE_LISTEN:
 328                 ret = -EINVAL;
 329                 break;
 330         case IW_CM_STATE_CLOSING:
 331                 /* remote peer closed first */
 332         case IW_CM_STATE_IDLE:
 333                 /* accept or connect returned !0 */
 334                 break;
 335         case IW_CM_STATE_CONN_RECV:
 336                 /*
 337                  * App called disconnect before/without calling accept after
 338                  * connect_request event delivered.
 339                  */
 340                 break;
 341         case IW_CM_STATE_CONN_SENT:
 342                 /* Can only get here if wait above fails */
 343         default:
 344                 BUG();
 345         }
 346         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 347
 348         if (qp) {
 349                 if (abrupt)
 350                         ret = iwcm_modify_qp_err(qp);
 351                 else
 352                         ret = iwcm_modify_qp_sqd(qp);
 353
 354                 /*
 355                  * If both sides are disconnecting the QP could
 356                  * already be in ERR or SQD states
 357                  */
 358                 ret = 0;
 359         }
 360
 361         return ret;
 362 }
 363 EXPORT_SYMBOL(iw_cm_disconnect);
 364
 365 /*
 366  * CM_ID <-- DESTROYING
 367  *
 368  * Clean up all resources associated with the connection and release
 369  * the initial reference taken by iw_create_cm_id.
 370  */
 371 static void destroy_cm_id(struct iw_cm_id *cm_id)
 372 {
 373         struct iwcm_id_private *cm_id_priv;
 374         unsigned long flags;
 375
 376         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 377         /*
 378          * Wait if we're currently in a connect or accept downcall. A
 379          * listening endpoint should never block here.
 380          */
 381         wait_event(cm_id_priv->connect_wait,
 382                    !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 383
 384         /*
 385          * Since we're deleting the cm_id, drop any events that
 386          * might arrive before the last dereference.
 387          */
 388         set_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags);
 389
 390         spin_lock_irqsave(&cm_id_priv->lock, flags);
 391         switch (cm_id_priv->state) {
 392         case IW_CM_STATE_LISTEN:
 393                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 394                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 395                 /* destroy the listening endpoint */
 396                 cm_id->device->iwcm->destroy_listen(cm_id);
 397                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 398                 break;
 399         case IW_CM_STATE_ESTABLISHED:
 400                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 401                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 402                 /* Abrupt close of the connection */
 403                 (void)iwcm_modify_qp_err(cm_id_priv->qp);
 404                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 405                 break;
 406         case IW_CM_STATE_IDLE:
 407         case IW_CM_STATE_CLOSING:
 408                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 409                 break;
 410         case IW_CM_STATE_CONN_RECV:
 411                 /*
 412                  * App called destroy before/without calling accept after
 413                  * receiving connection request event notification or
 414                  * returned non zero from the event callback function.
 415                  * In either case, must tell the provider to reject.
 416                  */
 417                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 418                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 419                 cm_id->device->iwcm->reject(cm_id, NULL, 0);
 420                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 421                 break;
 422         case IW_CM_STATE_CONN_SENT:
 423         case IW_CM_STATE_DESTROYING:
 424         default:
 425                 BUG();
 426                 break;
 427         }
 428         if (cm_id_priv->qp) {
 429                 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
 430                 cm_id_priv->qp = NULL;
 431         }
 432         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 433
 434         if (cm_id->mapped) {
 435                 iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr);
 436                 iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM);
 437         }
 438
 439         (void)iwcm_deref_id(cm_id_priv);
 440 }
 441
 442 /*
 443  * This function is only called by the application thread and cannot
 444  * be called by the event thread. The function will wait for all
 445  * references to be released on the cm_id and then kfree the cm_id
 446  * object.
 447  */
 448 void iw_destroy_cm_id(struct iw_cm_id *cm_id)
 449 {
 450         destroy_cm_id(cm_id);
 451 }
 452 EXPORT_SYMBOL(iw_destroy_cm_id);
 453
 454 /**
 455  * iw_cm_check_wildcard - If IP address is 0 then use original
 456  * @pm_addr: sockaddr containing the ip to check for wildcard
 457  * @cm_addr: sockaddr containing the actual IP address
 458  * @cm_outaddr: sockaddr to set IP addr which leaving port
 459  *
 460  *  Checks the pm_addr for wildcard and then sets cm_outaddr's
 461  *  IP to the actual (cm_addr).
 462  */
 463 static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr,
 464                                  struct sockaddr_storage *cm_addr,
 465                                  struct sockaddr_storage *cm_outaddr)
 466 {
 467         if (pm_addr->ss_family == AF_INET) {
 468                 struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr;
 469
 470                 if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) {
 471                         struct sockaddr_in *cm4_addr =
 472                                 (struct sockaddr_in *)cm_addr;
 473                         struct sockaddr_in *cm4_outaddr =
 474                                 (struct sockaddr_in *)cm_outaddr;
 475
 476                         cm4_outaddr->sin_addr = cm4_addr->sin_addr;
 477                 }
 478         } else {
 479                 struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr;
 480
 481                 if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) {
 482                         struct sockaddr_in6 *cm6_addr =
 483                                 (struct sockaddr_in6 *)cm_addr;
 484                         struct sockaddr_in6 *cm6_outaddr =
 485                                 (struct sockaddr_in6 *)cm_outaddr;
 486
 487                         cm6_outaddr->sin6_addr = cm6_addr->sin6_addr;
 488                 }
 489         }
 490 }
 491
 492 /**
 493  * iw_cm_map - Use portmapper to map the ports
 494  * @cm_id: connection manager pointer
 495  * @active: Indicates the active side when true
 496  * returns nonzero for error only if iwpm_create_mapinfo() fails
 497  *
 498  * Tries to add a mapping for a port using the Portmapper. If
 499  * successful in mapping the IP/Port it will check the remote
 500  * mapped IP address for a wildcard IP address and replace the
 501  * zero IP address with the remote_addr.
 502  */
 503 static int iw_cm_map(struct iw_cm_id *cm_id, bool active)
 504 {
 505         struct iwpm_dev_data pm_reg_msg;
 506         struct iwpm_sa_data pm_msg;
 507         int status;
 508
 509         cm_id->m_local_addr = cm_id->local_addr;
 510         cm_id->m_remote_addr = cm_id->remote_addr;
 511
 512         memcpy(pm_reg_msg.dev_name, cm_id->device->name,
 513                sizeof(pm_reg_msg.dev_name));
 514         memcpy(pm_reg_msg.if_name, cm_id->device->iwcm->ifname,
 515                sizeof(pm_reg_msg.if_name));
 516
 517         if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) ||
 518             !iwpm_valid_pid())
 519                 return 0;
 520
 521         cm_id->mapped = true;
 522         pm_msg.loc_addr = cm_id->local_addr;
 523         pm_msg.rem_addr = cm_id->remote_addr;
 524         if (active)
 525                 status = iwpm_add_and_query_mapping(&pm_msg,
 526                                                     RDMA_NL_IWCM);
 527         else
 528                 status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM);
 529
 530         if (!status) {
 531                 cm_id->m_local_addr = pm_msg.mapped_loc_addr;
 532                 if (active) {
 533                         cm_id->m_remote_addr = pm_msg.mapped_rem_addr;
 534                         iw_cm_check_wildcard(&pm_msg.mapped_rem_addr,
 535                                              &cm_id->remote_addr,
 536                                              &cm_id->m_remote_addr);
 537                 }
 538         }
 539
 540         return iwpm_create_mapinfo(&cm_id->local_addr,
 541                                    &cm_id->m_local_addr,
 542                                    RDMA_NL_IWCM);
 543 }
 544
 545 /*
 546  * CM_ID <-- LISTEN
 547  *
 548  * Start listening for connect requests. Generates one CONNECT_REQUEST
 549  * event for each inbound connect request.
 550  */
 551 int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
 552 {
 553         struct iwcm_id_private *cm_id_priv;
 554         unsigned long flags;
 555         int ret;
 556
 557         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 558
 559         if (!backlog)
 560                 backlog = default_backlog;
 561
 562         ret = alloc_work_entries(cm_id_priv, backlog);
 563         if (ret)
 564                 return ret;
 565
 566         spin_lock_irqsave(&cm_id_priv->lock, flags);
 567         switch (cm_id_priv->state) {
 568         case IW_CM_STATE_IDLE:
 569                 cm_id_priv->state = IW_CM_STATE_LISTEN;
 570                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 571                 ret = iw_cm_map(cm_id, false);
 572                 if (!ret)
 573                         ret = cm_id->device->iwcm->create_listen(cm_id, backlog);
 574                 if (ret)
 575                         cm_id_priv->state = IW_CM_STATE_IDLE;
 576                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 577                 break;
 578         default:
 579                 ret = -EINVAL;
 580         }
 581         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 582
 583         return ret;
 584 }
 585 EXPORT_SYMBOL(iw_cm_listen);
 586
 587 /*
 588  * CM_ID <-- IDLE
 589  *
 590  * Rejects an inbound connection request. No events are generated.
 591  */
 592 int iw_cm_reject(struct iw_cm_id *cm_id,
 593                  const void *private_data,
 594                  u8 private_data_len)
 595 {
 596         struct iwcm_id_private *cm_id_priv;
 597         unsigned long flags;
 598         int ret;
 599
 600         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 601         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 602
 603         spin_lock_irqsave(&cm_id_priv->lock, flags);
 604         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 605                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 606                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 607                 wake_up_all(&cm_id_priv->connect_wait);
 608                 return -EINVAL;
 609         }
 610         cm_id_priv->state = IW_CM_STATE_IDLE;
 611         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 612
 613         ret = cm_id->device->iwcm->reject(cm_id, private_data,
 614                                           private_data_len);
 615
 616         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 617         wake_up_all(&cm_id_priv->connect_wait);
 618
 619         return ret;
 620 }
 621 EXPORT_SYMBOL(iw_cm_reject);
 622
 623 /*
 624  * CM_ID <-- ESTABLISHED
 625  *
 626  * Accepts an inbound connection request and generates an ESTABLISHED
 627  * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
 628  * until the ESTABLISHED event is received from the provider.
 629  */
 630 int iw_cm_accept(struct iw_cm_id *cm_id,
 631                  struct iw_cm_conn_param *iw_param)
 632 {
 633         struct iwcm_id_private *cm_id_priv;
 634         struct ib_qp *qp;
 635         unsigned long flags;
 636         int ret;
 637
 638         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 639         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 640
 641         spin_lock_irqsave(&cm_id_priv->lock, flags);
 642         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 643                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 644                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 645                 wake_up_all(&cm_id_priv->connect_wait);
 646                 return -EINVAL;
 647         }
 648         /* Get the ib_qp given the QPN */
 649         qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
 650         if (!qp) {
 651                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 652                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 653                 wake_up_all(&cm_id_priv->connect_wait);
 654                 return -EINVAL;
 655         }
 656         cm_id->device->iwcm->add_ref(qp);
 657         cm_id_priv->qp = qp;
 658         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 659
 660         ret = cm_id->device->iwcm->accept(cm_id, iw_param);
 661         if (ret) {
 662                 /* An error on accept precludes provider events */
 663                 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 664                 cm_id_priv->state = IW_CM_STATE_IDLE;
 665                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 666                 if (cm_id_priv->qp) {
 667                         cm_id->device->iwcm->rem_ref(qp);
 668                         cm_id_priv->qp = NULL;
 669                 }
 670                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 671                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 672                 wake_up_all(&cm_id_priv->connect_wait);
 673         }
 674
 675         return ret;
 676 }
 677 EXPORT_SYMBOL(iw_cm_accept);
 678
 679 /*
 680  * Active Side: CM_ID <-- CONN_SENT
 681  *
 682  * If successful, results in the generation of a CONNECT_REPLY
 683  * event. iw_cm_disconnect and iw_cm_destroy will block until the
 684  * CONNECT_REPLY event is received from the provider.
 685  */
 686 int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param)
 687 {
 688         struct iwcm_id_private *cm_id_priv;
 689         int ret;
 690         unsigned long flags;
 691         struct ib_qp *qp;
 692
 693         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 694
 695         ret = alloc_work_entries(cm_id_priv, 4);
 696         if (ret)
 697                 return ret;
 698
 699         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 700         spin_lock_irqsave(&cm_id_priv->lock, flags);
 701
 702         if (cm_id_priv->state != IW_CM_STATE_IDLE) {
 703                 ret = -EINVAL;
 704                 goto err;
 705         }
 706
 707         /* Get the ib_qp given the QPN */
 708         qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
 709         if (!qp) {
 710                 ret = -EINVAL;
 711                 goto err;
 712         }
 713         cm_id->device->iwcm->add_ref(qp);
 714         cm_id_priv->qp = qp;
 715         cm_id_priv->state = IW_CM_STATE_CONN_SENT;
 716         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 717
 718         ret = iw_cm_map(cm_id, true);
 719         if (!ret)
 720                 ret = cm_id->device->iwcm->connect(cm_id, iw_param);
 721         if (!ret)
 722                 return 0;       /* success */
 723
 724         spin_lock_irqsave(&cm_id_priv->lock, flags);
 725         if (cm_id_priv->qp) {
 726                 cm_id->device->iwcm->rem_ref(qp);
 727                 cm_id_priv->qp = NULL;
 728         }
 729         cm_id_priv->state = IW_CM_STATE_IDLE;
 730 err:
 731         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 732         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 733         wake_up_all(&cm_id_priv->connect_wait);
 734         return ret;
 735 }
 736 EXPORT_SYMBOL(iw_cm_connect);
 737
 738 /*
 739  * Passive Side: new CM_ID <-- CONN_RECV
 740  *
 741  * Handles an inbound connect request. The function creates a new
 742  * iw_cm_id to represent the new connection and inherits the client
 743  * callback function and other attributes from the listening parent.
 744  *
 745  * The work item contains a pointer to the listen_cm_id and the event. The
 746  * listen_cm_id contains the client cm_handler, context and
 747  * device. These are copied when the device is cloned. The event
 748  * contains the new four tuple.
 749  *
 750  * An error on the child should not affect the parent, so this
 751  * function does not return a value.
 752  */
 753 static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv,
 754                                 struct iw_cm_event *iw_event)
 755 {
 756         unsigned long flags;
 757         struct iw_cm_id *cm_id;
 758         struct iwcm_id_private *cm_id_priv;
 759         int ret;
 760
 761         /*
 762          * The provider should never generate a connection request
 763          * event with a bad status.
 764          */
 765         BUG_ON(iw_event->status);
 766
 767         cm_id = iw_create_cm_id(listen_id_priv->id.device,
 768                                 listen_id_priv->id.cm_handler,
 769                                 listen_id_priv->id.context);
 770         /* If the cm_id could not be created, ignore the request */
 771         if (IS_ERR(cm_id))
 772                 goto out;
 773
 774         cm_id->provider_data = iw_event->provider_data;
 775         cm_id->m_local_addr = iw_event->local_addr;
 776         cm_id->m_remote_addr = iw_event->remote_addr;
 777         cm_id->local_addr = listen_id_priv->id.local_addr;
 778
 779         ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr,
 780                                    &iw_event->remote_addr,
 781                                    &cm_id->remote_addr,
 782                                    RDMA_NL_IWCM);
 783         if (ret) {
 784                 cm_id->remote_addr = iw_event->remote_addr;
 785         } else {
 786                 iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr,
 787                                      &iw_event->local_addr,
 788                                      &cm_id->local_addr);
 789                 iw_event->local_addr = cm_id->local_addr;
 790                 iw_event->remote_addr = cm_id->remote_addr;
 791         }
 792
 793         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 794         cm_id_priv->state = IW_CM_STATE_CONN_RECV;
 795
 796         /*
 797          * We could be destroying the listening id. If so, ignore this
 798          * upcall.
 799          */
 800         spin_lock_irqsave(&listen_id_priv->lock, flags);
 801         if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
 802                 spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 803                 iw_cm_reject(cm_id, NULL, 0);
 804                 iw_destroy_cm_id(cm_id);
 805                 goto out;
 806         }
 807         spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 808
 809         ret = alloc_work_entries(cm_id_priv, 3);
 810         if (ret) {
 811                 iw_cm_reject(cm_id, NULL, 0);
 812                 iw_destroy_cm_id(cm_id);
 813                 goto out;
 814         }
 815
 816         /* Call the client CM handler */
 817         ret = cm_id->cm_handler(cm_id, iw_event);
 818         if (ret) {
 819                 iw_cm_reject(cm_id, NULL, 0);
 820                 iw_destroy_cm_id(cm_id);
 821         }
 822
 823 out:
 824         if (iw_event->private_data_len)
 825                 kfree(iw_event->private_data);
 826 }
 827
 828 /*
 829  * Passive Side: CM_ID <-- ESTABLISHED
 830  *
 831  * The provider generated an ESTABLISHED event which means that
 832  * the MPA negotion has completed successfully and we are now in MPA
 833  * FPDU mode.
 834  *
 835  * This event can only be received in the CONN_RECV state. If the
 836  * remote peer closed, the ESTABLISHED event would be received followed
 837  * by the CLOSE event. If the app closes, it will block until we wake
 838  * it up after processing this event.
 839  */
 840 static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv,
 841                                struct iw_cm_event *iw_event)
 842 {
 843         unsigned long flags;
 844         int ret;
 845
 846         spin_lock_irqsave(&cm_id_priv->lock, flags);
 847
 848         /*
 849          * We clear the CONNECT_WAIT bit here to allow the callback
 850          * function to call iw_cm_disconnect. Calling iw_destroy_cm_id
 851          * from a callback handler is not allowed.
 852          */
 853         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 854         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 855         cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 856         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 857         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 858         wake_up_all(&cm_id_priv->connect_wait);
 859
 860         return ret;
 861 }
 862
 863 /*
 864  * Active Side: CM_ID <-- ESTABLISHED
 865  *
 866  * The app has called connect and is waiting for the established event to
 867  * post it's requests to the server. This event will wake up anyone
 868  * blocked in iw_cm_disconnect or iw_destroy_id.
 869  */
 870 static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv,
 871                                struct iw_cm_event *iw_event)
 872 {
 873         unsigned long flags;
 874         int ret;
 875
 876         spin_lock_irqsave(&cm_id_priv->lock, flags);
 877         /*
 878          * Clear the connect wait bit so a callback function calling
 879          * iw_cm_disconnect will not wait and deadlock this thread
 880          */
 881         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 882         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
 883         if (iw_event->status == 0) {
 884                 cm_id_priv->id.m_local_addr = iw_event->local_addr;
 885                 cm_id_priv->id.m_remote_addr = iw_event->remote_addr;
 886                 iw_event->local_addr = cm_id_priv->id.local_addr;
 887                 iw_event->remote_addr = cm_id_priv->id.remote_addr;
 888                 cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 889         } else {
 890                 /* REJECTED or RESET */
 891                 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
 892                 cm_id_priv->qp = NULL;
 893                 cm_id_priv->state = IW_CM_STATE_IDLE;
 894         }
 895         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 896         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 897
 898         if (iw_event->private_data_len)
 899                 kfree(iw_event->private_data);
 900
 901         /* Wake up waiters on connect complete */
 902         wake_up_all(&cm_id_priv->connect_wait);
 903
 904         return ret;
 905 }
 906
 907 /*
 908  * CM_ID <-- CLOSING
 909  *
 910  * If in the ESTABLISHED state, move to CLOSING.
 911  */
 912 static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv,
 913                                   struct iw_cm_event *iw_event)
 914 {
 915         unsigned long flags;
 916
 917         spin_lock_irqsave(&cm_id_priv->lock, flags);
 918         if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
 919                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 920         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 921 }
 922
 923 /*
 924  * CM_ID <-- IDLE
 925  *
 926  * If in the ESTBLISHED or CLOSING states, the QP will have have been
 927  * moved by the provider to the ERR state. Disassociate the CM_ID from
 928  * the QP,  move to IDLE, and remove the 'connected' reference.
 929  *
 930  * If in some other state, the cm_id was destroyed asynchronously.
 931  * This is the last reference that will result in waking up
 932  * the app thread blocked in iw_destroy_cm_id.
 933  */
 934 static int cm_close_handler(struct iwcm_id_private *cm_id_priv,
 935                                   struct iw_cm_event *iw_event)
 936 {
 937         unsigned long flags;
 938         int ret = 0;
 939         spin_lock_irqsave(&cm_id_priv->lock, flags);
 940
 941         if (cm_id_priv->qp) {
 942                 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
 943                 cm_id_priv->qp = NULL;
 944         }
 945         switch (cm_id_priv->state) {
 946         case IW_CM_STATE_ESTABLISHED:
 947         case IW_CM_STATE_CLOSING:
 948                 cm_id_priv->state = IW_CM_STATE_IDLE;
 949                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 950                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 951                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 952                 break;
 953         case IW_CM_STATE_DESTROYING:
 954                 break;
 955         default:
 956                 BUG();
 957         }
 958         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 959
 960         return ret;
 961 }
 962
 963 static int process_event(struct iwcm_id_private *cm_id_priv,
 964                          struct iw_cm_event *iw_event)
 965 {
 966         int ret = 0;
 967
 968         switch (iw_event->event) {
 969         case IW_CM_EVENT_CONNECT_REQUEST:
 970                 cm_conn_req_handler(cm_id_priv, iw_event);
 971                 break;
 972         case IW_CM_EVENT_CONNECT_REPLY:
 973                 ret = cm_conn_rep_handler(cm_id_priv, iw_event);
 974                 break;
 975         case IW_CM_EVENT_ESTABLISHED:
 976                 ret = cm_conn_est_handler(cm_id_priv, iw_event);
 977                 break;
 978         case IW_CM_EVENT_DISCONNECT:
 979                 cm_disconnect_handler(cm_id_priv, iw_event);
 980                 break;
 981         case IW_CM_EVENT_CLOSE:
 982                 ret = cm_close_handler(cm_id_priv, iw_event);
 983                 break;
 984         default:
 985                 BUG();
 986         }
 987
 988         return ret;
 989 }
 990
 991 /*
 992  * Process events on the work_list for the cm_id. If the callback
 993  * function requests that the cm_id be deleted, a flag is set in the
 994  * cm_id flags to indicate that when the last reference is
 995  * removed, the cm_id is to be destroyed. This is necessary to
 996  * distinguish between an object that will be destroyed by the app
 997  * thread asleep on the destroy_comp list vs. an object destroyed
 998  * here synchronously when the last reference is removed.
 999  */
1000 static void cm_work_handler(struct work_struct *_work)
1001 {
1002         struct iwcm_work *work = container_of(_work, struct iwcm_work, work);
1003         struct iw_cm_event levent;
1004         struct iwcm_id_private *cm_id_priv = work->cm_id;
1005         unsigned long flags;
1006         int empty;
1007         int ret = 0;
1008
1009         spin_lock_irqsave(&cm_id_priv->lock, flags);
1010         empty = list_empty(&cm_id_priv->work_list);
1011         while (!empty) {
1012                 work = list_entry(cm_id_priv->work_list.next,
1013                                   struct iwcm_work, list);
1014                 list_del_init(&work->list);
1015                 empty = list_empty(&cm_id_priv->work_list);
1016                 levent = work->event;
1017                 put_work(work);
1018                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1019
1020                 if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) {
1021                         ret = process_event(cm_id_priv, &levent);
1022                         if (ret)
1023                                 destroy_cm_id(&cm_id_priv->id);
1024                 } else
1025                         pr_debug("dropping event %d\n", levent.event);
1026                 if (iwcm_deref_id(cm_id_priv))
1027                         return;
1028                 if (empty)
1029                         return;
1030                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1031         }
1032         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1033 }
1034
1035 /*
1036  * This function is called on interrupt context. Schedule events on
1037  * the iwcm_wq thread to allow callback functions to downcall into
1038  * the CM and/or block.  Events are queued to a per-CM_ID
1039  * work_list. If this is the first event on the work_list, the work
1040  * element is also queued on the iwcm_wq thread.
1041  *
1042  * Each event holds a reference on the cm_id. Until the last posted
1043  * event has been delivered and processed, the cm_id cannot be
1044  * deleted.
1045  *
1046  * Returns:
1047  *            0 - the event was handled.
1048  *      -ENOMEM - the event was not handled due to lack of resources.
1049  */
1050 static int cm_event_handler(struct iw_cm_id *cm_id,
1051                              struct iw_cm_event *iw_event)
1052 {
1053         struct iwcm_work *work;
1054         struct iwcm_id_private *cm_id_priv;
1055         unsigned long flags;
1056         int ret = 0;
1057
1058         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1059
1060         spin_lock_irqsave(&cm_id_priv->lock, flags);
1061         work = get_work(cm_id_priv);
1062         if (!work) {
1063                 ret = -ENOMEM;
1064                 goto out;
1065         }
1066
1067         INIT_WORK(&work->work, cm_work_handler);
1068         work->cm_id = cm_id_priv;
1069         work->event = *iw_event;
1070
1071         if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST ||
1072              work->event.event == IW_CM_EVENT_CONNECT_REPLY) &&
1073             work->event.private_data_len) {
1074                 ret = copy_private_data(&work->event);
1075                 if (ret) {
1076                         put_work(work);
1077                         goto out;
1078                 }
1079         }
1080
1081         atomic_inc(&cm_id_priv->refcount);
1082         if (list_empty(&cm_id_priv->work_list)) {
1083                 list_add_tail(&work->list, &cm_id_priv->work_list);
1084                 queue_work(iwcm_wq, &work->work);
1085         } else
1086                 list_add_tail(&work->list, &cm_id_priv->work_list);
1087 out:
1088         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1089         return ret;
1090 }
1091
1092 static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv,
1093                                   struct ib_qp_attr *qp_attr,
1094                                   int *qp_attr_mask)
1095 {
1096         unsigned long flags;
1097         int ret;
1098
1099         spin_lock_irqsave(&cm_id_priv->lock, flags);
1100         switch (cm_id_priv->state) {
1101         case IW_CM_STATE_IDLE:
1102         case IW_CM_STATE_CONN_SENT:
1103         case IW_CM_STATE_CONN_RECV:
1104         case IW_CM_STATE_ESTABLISHED:
1105                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1106                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
1107                                            IB_ACCESS_REMOTE_READ;
1108                 ret = 0;
1109                 break;
1110         default:
1111                 ret = -EINVAL;
1112                 break;
1113         }
1114         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1115         return ret;
1116 }
1117
1118 static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
1119                                   struct ib_qp_attr *qp_attr,
1120                                   int *qp_attr_mask)
1121 {
1122         unsigned long flags;
1123         int ret;
1124
1125         spin_lock_irqsave(&cm_id_priv->lock, flags);
1126         switch (cm_id_priv->state) {
1127         case IW_CM_STATE_IDLE:
1128         case IW_CM_STATE_CONN_SENT:
1129         case IW_CM_STATE_CONN_RECV:
1130         case IW_CM_STATE_ESTABLISHED:
1131                 *qp_attr_mask = 0;
1132                 ret = 0;
1133                 break;
1134         default:
1135                 ret = -EINVAL;
1136                 break;
1137         }
1138         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1139         return ret;
1140 }
1141
1142 int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
1143                        struct ib_qp_attr *qp_attr,
1144                        int *qp_attr_mask)
1145 {
1146         struct iwcm_id_private *cm_id_priv;
1147         int ret;
1148
1149         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1150         switch (qp_attr->qp_state) {
1151         case IB_QPS_INIT:
1152         case IB_QPS_RTR:
1153                 ret = iwcm_init_qp_init_attr(cm_id_priv,
1154                                              qp_attr, qp_attr_mask);
1155                 break;
1156         case IB_QPS_RTS:
1157                 ret = iwcm_init_qp_rts_attr(cm_id_priv,
1158                                             qp_attr, qp_attr_mask);
1159                 break;
1160         default:
1161                 ret = -EINVAL;
1162                 break;
1163         }
1164         return ret;
1165 }
1166 EXPORT_SYMBOL(iw_cm_init_qp_attr);
1167
1168 static int __init iw_cm_init(void)
1169 {
1170         int ret;
1171
1172         ret = iwpm_init(RDMA_NL_IWCM);
1173         if (ret)
1174                 pr_err("iw_cm: couldn't init iwpm\n");
1175         else
1176                 rdma_nl_register(RDMA_NL_IWCM, iwcm_nl_cb_table);
1177         iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", 0);
1178         if (!iwcm_wq)
1179                 return -ENOMEM;
1180
1181         iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm",
1182                                                  iwcm_ctl_table);
1183         if (!iwcm_ctl_table_hdr) {
1184                 pr_err("iw_cm: couldn't register sysctl paths\n");
1185                 destroy_workqueue(iwcm_wq);
1186                 return -ENOMEM;
1187         }
1188
1189         return 0;
1190 }
1191
1192 static void __exit iw_cm_cleanup(void)
1193 {
1194         unregister_net_sysctl_table(iwcm_ctl_table_hdr);
1195         destroy_workqueue(iwcm_wq);
1196         rdma_nl_unregister(RDMA_NL_IWCM);
1197         iwpm_exit(RDMA_NL_IWCM);
1198 }
1199
1200 MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2);
1201
1202 module_init(iw_cm_init);
1203 module_exit(iw_cm_cleanup);