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[] = {
  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         struct iwcm_id_private *cm_id_priv;
 451
 452         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 453         destroy_cm_id(cm_id);
 454 }
 455 EXPORT_SYMBOL(iw_destroy_cm_id);
 456
 457 /**
 458  * iw_cm_check_wildcard - If IP address is 0 then use original
 459  * @pm_addr: sockaddr containing the ip to check for wildcard
 460  * @cm_addr: sockaddr containing the actual IP address
 461  * @cm_outaddr: sockaddr to set IP addr which leaving port
 462  *
 463  *  Checks the pm_addr for wildcard and then sets cm_outaddr's
 464  *  IP to the actual (cm_addr).
 465  */
 466 static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr,
 467                                  struct sockaddr_storage *cm_addr,
 468                                  struct sockaddr_storage *cm_outaddr)
 469 {
 470         if (pm_addr->ss_family == AF_INET) {
 471                 struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr;
 472
 473                 if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) {
 474                         struct sockaddr_in *cm4_addr =
 475                                 (struct sockaddr_in *)cm_addr;
 476                         struct sockaddr_in *cm4_outaddr =
 477                                 (struct sockaddr_in *)cm_outaddr;
 478
 479                         cm4_outaddr->sin_addr = cm4_addr->sin_addr;
 480                 }
 481         } else {
 482                 struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr;
 483
 484                 if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) {
 485                         struct sockaddr_in6 *cm6_addr =
 486                                 (struct sockaddr_in6 *)cm_addr;
 487                         struct sockaddr_in6 *cm6_outaddr =
 488                                 (struct sockaddr_in6 *)cm_outaddr;
 489
 490                         cm6_outaddr->sin6_addr = cm6_addr->sin6_addr;
 491                 }
 492         }
 493 }
 494
 495 /**
 496  * iw_cm_map - Use portmapper to map the ports
 497  * @cm_id: connection manager pointer
 498  * @active: Indicates the active side when true
 499  * returns nonzero for error only if iwpm_create_mapinfo() fails
 500  *
 501  * Tries to add a mapping for a port using the Portmapper. If
 502  * successful in mapping the IP/Port it will check the remote
 503  * mapped IP address for a wildcard IP address and replace the
 504  * zero IP address with the remote_addr.
 505  */
 506 static int iw_cm_map(struct iw_cm_id *cm_id, bool active)
 507 {
 508         struct iwpm_dev_data pm_reg_msg;
 509         struct iwpm_sa_data pm_msg;
 510         int status;
 511
 512         cm_id->m_local_addr = cm_id->local_addr;
 513         cm_id->m_remote_addr = cm_id->remote_addr;
 514
 515         memcpy(pm_reg_msg.dev_name, cm_id->device->name,
 516                sizeof(pm_reg_msg.dev_name));
 517         memcpy(pm_reg_msg.if_name, cm_id->device->iwcm->ifname,
 518                sizeof(pm_reg_msg.if_name));
 519
 520         if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) ||
 521             !iwpm_valid_pid())
 522                 return 0;
 523
 524         cm_id->mapped = true;
 525         pm_msg.loc_addr = cm_id->local_addr;
 526         pm_msg.rem_addr = cm_id->remote_addr;
 527         if (active)
 528                 status = iwpm_add_and_query_mapping(&pm_msg,
 529                                                     RDMA_NL_IWCM);
 530         else
 531                 status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM);
 532
 533         if (!status) {
 534                 cm_id->m_local_addr = pm_msg.mapped_loc_addr;
 535                 if (active) {
 536                         cm_id->m_remote_addr = pm_msg.mapped_rem_addr;
 537                         iw_cm_check_wildcard(&pm_msg.mapped_rem_addr,
 538                                              &cm_id->remote_addr,
 539                                              &cm_id->m_remote_addr);
 540                 }
 541         }
 542
 543         return iwpm_create_mapinfo(&cm_id->local_addr,
 544                                    &cm_id->m_local_addr,
 545                                    RDMA_NL_IWCM);
 546 }
 547
 548 /*
 549  * CM_ID <-- LISTEN
 550  *
 551  * Start listening for connect requests. Generates one CONNECT_REQUEST
 552  * event for each inbound connect request.
 553  */
 554 int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
 555 {
 556         struct iwcm_id_private *cm_id_priv;
 557         unsigned long flags;
 558         int ret;
 559
 560         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 561
 562         if (!backlog)
 563                 backlog = default_backlog;
 564
 565         ret = alloc_work_entries(cm_id_priv, backlog);
 566         if (ret)
 567                 return ret;
 568
 569         spin_lock_irqsave(&cm_id_priv->lock, flags);
 570         switch (cm_id_priv->state) {
 571         case IW_CM_STATE_IDLE:
 572                 cm_id_priv->state = IW_CM_STATE_LISTEN;
 573                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 574                 ret = iw_cm_map(cm_id, false);
 575                 if (!ret)
 576                         ret = cm_id->device->iwcm->create_listen(cm_id, backlog);
 577                 if (ret)
 578                         cm_id_priv->state = IW_CM_STATE_IDLE;
 579                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 580                 break;
 581         default:
 582                 ret = -EINVAL;
 583         }
 584         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 585
 586         return ret;
 587 }
 588 EXPORT_SYMBOL(iw_cm_listen);
 589
 590 /*
 591  * CM_ID <-- IDLE
 592  *
 593  * Rejects an inbound connection request. No events are generated.
 594  */
 595 int iw_cm_reject(struct iw_cm_id *cm_id,
 596                  const void *private_data,
 597                  u8 private_data_len)
 598 {
 599         struct iwcm_id_private *cm_id_priv;
 600         unsigned long flags;
 601         int ret;
 602
 603         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 604         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 605
 606         spin_lock_irqsave(&cm_id_priv->lock, flags);
 607         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 608                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 609                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 610                 wake_up_all(&cm_id_priv->connect_wait);
 611                 return -EINVAL;
 612         }
 613         cm_id_priv->state = IW_CM_STATE_IDLE;
 614         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 615
 616         ret = cm_id->device->iwcm->reject(cm_id, private_data,
 617                                           private_data_len);
 618
 619         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 620         wake_up_all(&cm_id_priv->connect_wait);
 621
 622         return ret;
 623 }
 624 EXPORT_SYMBOL(iw_cm_reject);
 625
 626 /*
 627  * CM_ID <-- ESTABLISHED
 628  *
 629  * Accepts an inbound connection request and generates an ESTABLISHED
 630  * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
 631  * until the ESTABLISHED event is received from the provider.
 632  */
 633 int iw_cm_accept(struct iw_cm_id *cm_id,
 634                  struct iw_cm_conn_param *iw_param)
 635 {
 636         struct iwcm_id_private *cm_id_priv;
 637         struct ib_qp *qp;
 638         unsigned long flags;
 639         int ret;
 640
 641         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 642         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 643
 644         spin_lock_irqsave(&cm_id_priv->lock, flags);
 645         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 646                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 647                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 648                 wake_up_all(&cm_id_priv->connect_wait);
 649                 return -EINVAL;
 650         }
 651         /* Get the ib_qp given the QPN */
 652         qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
 653         if (!qp) {
 654                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 655                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 656                 wake_up_all(&cm_id_priv->connect_wait);
 657                 return -EINVAL;
 658         }
 659         cm_id->device->iwcm->add_ref(qp);
 660         cm_id_priv->qp = qp;
 661         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 662
 663         ret = cm_id->device->iwcm->accept(cm_id, iw_param);
 664         if (ret) {
 665                 /* An error on accept precludes provider events */
 666                 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 667                 cm_id_priv->state = IW_CM_STATE_IDLE;
 668                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 669                 if (cm_id_priv->qp) {
 670                         cm_id->device->iwcm->rem_ref(qp);
 671                         cm_id_priv->qp = NULL;
 672                 }
 673                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 674                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 675                 wake_up_all(&cm_id_priv->connect_wait);
 676         }
 677
 678         return ret;
 679 }
 680 EXPORT_SYMBOL(iw_cm_accept);
 681
 682 /*
 683  * Active Side: CM_ID <-- CONN_SENT
 684  *
 685  * If successful, results in the generation of a CONNECT_REPLY
 686  * event. iw_cm_disconnect and iw_cm_destroy will block until the
 687  * CONNECT_REPLY event is received from the provider.
 688  */
 689 int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param)
 690 {
 691         struct iwcm_id_private *cm_id_priv;
 692         int ret;
 693         unsigned long flags;
 694         struct ib_qp *qp;
 695
 696         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 697
 698         ret = alloc_work_entries(cm_id_priv, 4);
 699         if (ret)
 700                 return ret;
 701
 702         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 703         spin_lock_irqsave(&cm_id_priv->lock, flags);
 704
 705         if (cm_id_priv->state != IW_CM_STATE_IDLE) {
 706                 ret = -EINVAL;
 707                 goto err;
 708         }
 709
 710         /* Get the ib_qp given the QPN */
 711         qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
 712         if (!qp) {
 713                 ret = -EINVAL;
 714                 goto err;
 715         }
 716         cm_id->device->iwcm->add_ref(qp);
 717         cm_id_priv->qp = qp;
 718         cm_id_priv->state = IW_CM_STATE_CONN_SENT;
 719         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 720
 721         ret = iw_cm_map(cm_id, true);
 722         if (!ret)
 723                 ret = cm_id->device->iwcm->connect(cm_id, iw_param);
 724         if (!ret)
 725                 return 0;       /* success */
 726
 727         spin_lock_irqsave(&cm_id_priv->lock, flags);
 728         if (cm_id_priv->qp) {
 729                 cm_id->device->iwcm->rem_ref(qp);
 730                 cm_id_priv->qp = NULL;
 731         }
 732         cm_id_priv->state = IW_CM_STATE_IDLE;
 733 err:
 734         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 735         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 736         wake_up_all(&cm_id_priv->connect_wait);
 737         return ret;
 738 }
 739 EXPORT_SYMBOL(iw_cm_connect);
 740
 741 /*
 742  * Passive Side: new CM_ID <-- CONN_RECV
 743  *
 744  * Handles an inbound connect request. The function creates a new
 745  * iw_cm_id to represent the new connection and inherits the client
 746  * callback function and other attributes from the listening parent.
 747  *
 748  * The work item contains a pointer to the listen_cm_id and the event. The
 749  * listen_cm_id contains the client cm_handler, context and
 750  * device. These are copied when the device is cloned. The event
 751  * contains the new four tuple.
 752  *
 753  * An error on the child should not affect the parent, so this
 754  * function does not return a value.
 755  */
 756 static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv,
 757                                 struct iw_cm_event *iw_event)
 758 {
 759         unsigned long flags;
 760         struct iw_cm_id *cm_id;
 761         struct iwcm_id_private *cm_id_priv;
 762         int ret;
 763
 764         /*
 765          * The provider should never generate a connection request
 766          * event with a bad status.
 767          */
 768         BUG_ON(iw_event->status);
 769
 770         cm_id = iw_create_cm_id(listen_id_priv->id.device,
 771                                 listen_id_priv->id.cm_handler,
 772                                 listen_id_priv->id.context);
 773         /* If the cm_id could not be created, ignore the request */
 774         if (IS_ERR(cm_id))
 775                 goto out;
 776
 777         cm_id->provider_data = iw_event->provider_data;
 778         cm_id->m_local_addr = iw_event->local_addr;
 779         cm_id->m_remote_addr = iw_event->remote_addr;
 780         cm_id->local_addr = listen_id_priv->id.local_addr;
 781
 782         ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr,
 783                                    &iw_event->remote_addr,
 784                                    &cm_id->remote_addr,
 785                                    RDMA_NL_IWCM);
 786         if (ret) {
 787                 cm_id->remote_addr = iw_event->remote_addr;
 788         } else {
 789                 iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr,
 790                                      &iw_event->local_addr,
 791                                      &cm_id->local_addr);
 792                 iw_event->local_addr = cm_id->local_addr;
 793                 iw_event->remote_addr = cm_id->remote_addr;
 794         }
 795
 796         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 797         cm_id_priv->state = IW_CM_STATE_CONN_RECV;
 798
 799         /*
 800          * We could be destroying the listening id. If so, ignore this
 801          * upcall.
 802          */
 803         spin_lock_irqsave(&listen_id_priv->lock, flags);
 804         if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
 805                 spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 806                 iw_cm_reject(cm_id, NULL, 0);
 807                 iw_destroy_cm_id(cm_id);
 808                 goto out;
 809         }
 810         spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 811
 812         ret = alloc_work_entries(cm_id_priv, 3);
 813         if (ret) {
 814                 iw_cm_reject(cm_id, NULL, 0);
 815                 iw_destroy_cm_id(cm_id);
 816                 goto out;
 817         }
 818
 819         /* Call the client CM handler */
 820         ret = cm_id->cm_handler(cm_id, iw_event);
 821         if (ret) {
 822                 iw_cm_reject(cm_id, NULL, 0);
 823                 iw_destroy_cm_id(cm_id);
 824         }
 825
 826 out:
 827         if (iw_event->private_data_len)
 828                 kfree(iw_event->private_data);
 829 }
 830
 831 /*
 832  * Passive Side: CM_ID <-- ESTABLISHED
 833  *
 834  * The provider generated an ESTABLISHED event which means that
 835  * the MPA negotion has completed successfully and we are now in MPA
 836  * FPDU mode.
 837  *
 838  * This event can only be received in the CONN_RECV state. If the
 839  * remote peer closed, the ESTABLISHED event would be received followed
 840  * by the CLOSE event. If the app closes, it will block until we wake
 841  * it up after processing this event.
 842  */
 843 static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv,
 844                                struct iw_cm_event *iw_event)
 845 {
 846         unsigned long flags;
 847         int ret;
 848
 849         spin_lock_irqsave(&cm_id_priv->lock, flags);
 850
 851         /*
 852          * We clear the CONNECT_WAIT bit here to allow the callback
 853          * function to call iw_cm_disconnect. Calling iw_destroy_cm_id
 854          * from a callback handler is not allowed.
 855          */
 856         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 857         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 858         cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 859         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 860         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 861         wake_up_all(&cm_id_priv->connect_wait);
 862
 863         return ret;
 864 }
 865
 866 /*
 867  * Active Side: CM_ID <-- ESTABLISHED
 868  *
 869  * The app has called connect and is waiting for the established event to
 870  * post it's requests to the server. This event will wake up anyone
 871  * blocked in iw_cm_disconnect or iw_destroy_id.
 872  */
 873 static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv,
 874                                struct iw_cm_event *iw_event)
 875 {
 876         unsigned long flags;
 877         int ret;
 878
 879         spin_lock_irqsave(&cm_id_priv->lock, flags);
 880         /*
 881          * Clear the connect wait bit so a callback function calling
 882          * iw_cm_disconnect will not wait and deadlock this thread
 883          */
 884         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 885         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
 886         if (iw_event->status == 0) {
 887                 cm_id_priv->id.m_local_addr = iw_event->local_addr;
 888                 cm_id_priv->id.m_remote_addr = iw_event->remote_addr;
 889                 iw_event->local_addr = cm_id_priv->id.local_addr;
 890                 iw_event->remote_addr = cm_id_priv->id.remote_addr;
 891                 cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 892         } else {
 893                 /* REJECTED or RESET */
 894                 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
 895                 cm_id_priv->qp = NULL;
 896                 cm_id_priv->state = IW_CM_STATE_IDLE;
 897         }
 898         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 899         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 900
 901         if (iw_event->private_data_len)
 902                 kfree(iw_event->private_data);
 903
 904         /* Wake up waiters on connect complete */
 905         wake_up_all(&cm_id_priv->connect_wait);
 906
 907         return ret;
 908 }
 909
 910 /*
 911  * CM_ID <-- CLOSING
 912  *
 913  * If in the ESTABLISHED state, move to CLOSING.
 914  */
 915 static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv,
 916                                   struct iw_cm_event *iw_event)
 917 {
 918         unsigned long flags;
 919
 920         spin_lock_irqsave(&cm_id_priv->lock, flags);
 921         if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
 922                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 923         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 924 }
 925
 926 /*
 927  * CM_ID <-- IDLE
 928  *
 929  * If in the ESTBLISHED or CLOSING states, the QP will have have been
 930  * moved by the provider to the ERR state. Disassociate the CM_ID from
 931  * the QP,  move to IDLE, and remove the 'connected' reference.
 932  *
 933  * If in some other state, the cm_id was destroyed asynchronously.
 934  * This is the last reference that will result in waking up
 935  * the app thread blocked in iw_destroy_cm_id.
 936  */
 937 static int cm_close_handler(struct iwcm_id_private *cm_id_priv,
 938                                   struct iw_cm_event *iw_event)
 939 {
 940         unsigned long flags;
 941         int ret = 0;
 942         spin_lock_irqsave(&cm_id_priv->lock, flags);
 943
 944         if (cm_id_priv->qp) {
 945                 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
 946                 cm_id_priv->qp = NULL;
 947         }
 948         switch (cm_id_priv->state) {
 949         case IW_CM_STATE_ESTABLISHED:
 950         case IW_CM_STATE_CLOSING:
 951                 cm_id_priv->state = IW_CM_STATE_IDLE;
 952                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 953                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 954                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 955                 break;
 956         case IW_CM_STATE_DESTROYING:
 957                 break;
 958         default:
 959                 BUG();
 960         }
 961         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 962
 963         return ret;
 964 }
 965
 966 static int process_event(struct iwcm_id_private *cm_id_priv,
 967                          struct iw_cm_event *iw_event)
 968 {
 969         int ret = 0;
 970
 971         switch (iw_event->event) {
 972         case IW_CM_EVENT_CONNECT_REQUEST:
 973                 cm_conn_req_handler(cm_id_priv, iw_event);
 974                 break;
 975         case IW_CM_EVENT_CONNECT_REPLY:
 976                 ret = cm_conn_rep_handler(cm_id_priv, iw_event);
 977                 break;
 978         case IW_CM_EVENT_ESTABLISHED:
 979                 ret = cm_conn_est_handler(cm_id_priv, iw_event);
 980                 break;
 981         case IW_CM_EVENT_DISCONNECT:
 982                 cm_disconnect_handler(cm_id_priv, iw_event);
 983                 break;
 984         case IW_CM_EVENT_CLOSE:
 985                 ret = cm_close_handler(cm_id_priv, iw_event);
 986                 break;
 987         default:
 988                 BUG();
 989         }
 990
 991         return ret;
 992 }
 993
 994 /*
 995  * Process events on the work_list for the cm_id. If the callback
 996  * function requests that the cm_id be deleted, a flag is set in the
 997  * cm_id flags to indicate that when the last reference is
 998  * removed, the cm_id is to be destroyed. This is necessary to
 999  * distinguish between an object that will be destroyed by the app
1000  * thread asleep on the destroy_comp list vs. an object destroyed
1001  * here synchronously when the last reference is removed.
1002  */
1003 static void cm_work_handler(struct work_struct *_work)
1004 {
1005         struct iwcm_work *work = container_of(_work, struct iwcm_work, work);
1006         struct iw_cm_event levent;
1007         struct iwcm_id_private *cm_id_priv = work->cm_id;
1008         unsigned long flags;
1009         int empty;
1010         int ret = 0;
1011
1012         spin_lock_irqsave(&cm_id_priv->lock, flags);
1013         empty = list_empty(&cm_id_priv->work_list);
1014         while (!empty) {
1015                 work = list_entry(cm_id_priv->work_list.next,
1016                                   struct iwcm_work, list);
1017                 list_del_init(&work->list);
1018                 empty = list_empty(&cm_id_priv->work_list);
1019                 levent = work->event;
1020                 put_work(work);
1021                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1022
1023                 if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) {
1024                         ret = process_event(cm_id_priv, &levent);
1025                         if (ret)
1026                                 destroy_cm_id(&cm_id_priv->id);
1027                 } else
1028                         pr_debug("dropping event %d\n", levent.event);
1029                 if (iwcm_deref_id(cm_id_priv))
1030                         return;
1031                 if (empty)
1032                         return;
1033                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1034         }
1035         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1036 }
1037
1038 /*
1039  * This function is called on interrupt context. Schedule events on
1040  * the iwcm_wq thread to allow callback functions to downcall into
1041  * the CM and/or block.  Events are queued to a per-CM_ID
1042  * work_list. If this is the first event on the work_list, the work
1043  * element is also queued on the iwcm_wq thread.
1044  *
1045  * Each event holds a reference on the cm_id. Until the last posted
1046  * event has been delivered and processed, the cm_id cannot be
1047  * deleted.
1048  *
1049  * Returns:
1050  *            0 - the event was handled.
1051  *      -ENOMEM - the event was not handled due to lack of resources.
1052  */
1053 static int cm_event_handler(struct iw_cm_id *cm_id,
1054                              struct iw_cm_event *iw_event)
1055 {
1056         struct iwcm_work *work;
1057         struct iwcm_id_private *cm_id_priv;
1058         unsigned long flags;
1059         int ret = 0;
1060
1061         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1062
1063         spin_lock_irqsave(&cm_id_priv->lock, flags);
1064         work = get_work(cm_id_priv);
1065         if (!work) {
1066                 ret = -ENOMEM;
1067                 goto out;
1068         }
1069
1070         INIT_WORK(&work->work, cm_work_handler);
1071         work->cm_id = cm_id_priv;
1072         work->event = *iw_event;
1073
1074         if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST ||
1075              work->event.event == IW_CM_EVENT_CONNECT_REPLY) &&
1076             work->event.private_data_len) {
1077                 ret = copy_private_data(&work->event);
1078                 if (ret) {
1079                         put_work(work);
1080                         goto out;
1081                 }
1082         }
1083
1084         atomic_inc(&cm_id_priv->refcount);
1085         if (list_empty(&cm_id_priv->work_list)) {
1086                 list_add_tail(&work->list, &cm_id_priv->work_list);
1087                 queue_work(iwcm_wq, &work->work);
1088         } else
1089                 list_add_tail(&work->list, &cm_id_priv->work_list);
1090 out:
1091         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1092         return ret;
1093 }
1094
1095 static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv,
1096                                   struct ib_qp_attr *qp_attr,
1097                                   int *qp_attr_mask)
1098 {
1099         unsigned long flags;
1100         int ret;
1101
1102         spin_lock_irqsave(&cm_id_priv->lock, flags);
1103         switch (cm_id_priv->state) {
1104         case IW_CM_STATE_IDLE:
1105         case IW_CM_STATE_CONN_SENT:
1106         case IW_CM_STATE_CONN_RECV:
1107         case IW_CM_STATE_ESTABLISHED:
1108                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1109                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
1110                                            IB_ACCESS_REMOTE_READ;
1111                 ret = 0;
1112                 break;
1113         default:
1114                 ret = -EINVAL;
1115                 break;
1116         }
1117         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1118         return ret;
1119 }
1120
1121 static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
1122                                   struct ib_qp_attr *qp_attr,
1123                                   int *qp_attr_mask)
1124 {
1125         unsigned long flags;
1126         int ret;
1127
1128         spin_lock_irqsave(&cm_id_priv->lock, flags);
1129         switch (cm_id_priv->state) {
1130         case IW_CM_STATE_IDLE:
1131         case IW_CM_STATE_CONN_SENT:
1132         case IW_CM_STATE_CONN_RECV:
1133         case IW_CM_STATE_ESTABLISHED:
1134                 *qp_attr_mask = 0;
1135                 ret = 0;
1136                 break;
1137         default:
1138                 ret = -EINVAL;
1139                 break;
1140         }
1141         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1142         return ret;
1143 }
1144
1145 int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
1146                        struct ib_qp_attr *qp_attr,
1147                        int *qp_attr_mask)
1148 {
1149         struct iwcm_id_private *cm_id_priv;
1150         int ret;
1151
1152         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1153         switch (qp_attr->qp_state) {
1154         case IB_QPS_INIT:
1155         case IB_QPS_RTR:
1156                 ret = iwcm_init_qp_init_attr(cm_id_priv,
1157                                              qp_attr, qp_attr_mask);
1158                 break;
1159         case IB_QPS_RTS:
1160                 ret = iwcm_init_qp_rts_attr(cm_id_priv,
1161                                             qp_attr, qp_attr_mask);
1162                 break;
1163         default:
1164                 ret = -EINVAL;
1165                 break;
1166         }
1167         return ret;
1168 }
1169 EXPORT_SYMBOL(iw_cm_init_qp_attr);
1170
1171 static int __init iw_cm_init(void)
1172 {
1173         int ret;
1174
1175         ret = iwpm_init(RDMA_NL_IWCM);
1176         if (ret)
1177                 pr_err("iw_cm: couldn't init iwpm\n");
1178         else
1179                 rdma_nl_register(RDMA_NL_IWCM, iwcm_nl_cb_table);
1180         iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", 0);
1181         if (!iwcm_wq)
1182                 return -ENOMEM;
1183
1184         iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm",
1185                                                  iwcm_ctl_table);
1186         if (!iwcm_ctl_table_hdr) {
1187                 pr_err("iw_cm: couldn't register sysctl paths\n");
1188                 destroy_workqueue(iwcm_wq);
1189                 return -ENOMEM;
1190         }
1191
1192         return 0;
1193 }
1194
1195 static void __exit iw_cm_cleanup(void)
1196 {
1197         unregister_net_sysctl_table(iwcm_ctl_table_hdr);
1198         destroy_workqueue(iwcm_wq);
1199         rdma_nl_unregister(RDMA_NL_IWCM);
1200         iwpm_exit(RDMA_NL_IWCM);
1201 }
1202
1203 MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2);
1204
1205 module_init(iw_cm_init);
1206 module_exit(iw_cm_cleanup);