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                 list_del(e);
 163                 kfree(list_entry(e, struct iwcm_work, free_list));
 164         }
 165 }
 166
 167 static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count)
 168 {
 169         struct iwcm_work *work;
 170
 171         BUG_ON(!list_empty(&cm_id_priv->work_free_list));
 172         while (count--) {
 173                 work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL);
 174                 if (!work) {
 175                         dealloc_work_entries(cm_id_priv);
 176                         return -ENOMEM;
 177                 }
 178                 work->cm_id = cm_id_priv;
 179                 INIT_LIST_HEAD(&work->list);
 180                 put_work(work);
 181         }
 182         return 0;
 183 }
 184
 185 /*
 186  * Save private data from incoming connection requests to
 187  * iw_cm_event, so the low level driver doesn't have to. Adjust
 188  * the event ptr to point to the local copy.
 189  */
 190 static int copy_private_data(struct iw_cm_event *event)
 191 {
 192         void *p;
 193
 194         p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC);
 195         if (!p)
 196                 return -ENOMEM;
 197         event->private_data = p;
 198         return 0;
 199 }
 200
 201 static void free_cm_id(struct iwcm_id_private *cm_id_priv)
 202 {
 203         dealloc_work_entries(cm_id_priv);
 204         kfree(cm_id_priv);
 205 }
 206
 207 /*
 208  * Release a reference on cm_id. If the last reference is being
 209  * released, free the cm_id and return 1.
 210  */
 211 static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
 212 {
 213         BUG_ON(atomic_read(&cm_id_priv->refcount)==0);
 214         if (atomic_dec_and_test(&cm_id_priv->refcount)) {
 215                 BUG_ON(!list_empty(&cm_id_priv->work_list));
 216                 free_cm_id(cm_id_priv);
 217                 return 1;
 218         }
 219
 220         return 0;
 221 }
 222
 223 static void add_ref(struct iw_cm_id *cm_id)
 224 {
 225         struct iwcm_id_private *cm_id_priv;
 226         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 227         atomic_inc(&cm_id_priv->refcount);
 228 }
 229
 230 static void rem_ref(struct iw_cm_id *cm_id)
 231 {
 232         struct iwcm_id_private *cm_id_priv;
 233
 234         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 235
 236         (void)iwcm_deref_id(cm_id_priv);
 237 }
 238
 239 static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event);
 240
 241 struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
 242                                  iw_cm_handler cm_handler,
 243                                  void *context)
 244 {
 245         struct iwcm_id_private *cm_id_priv;
 246
 247         cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL);
 248         if (!cm_id_priv)
 249                 return ERR_PTR(-ENOMEM);
 250
 251         cm_id_priv->state = IW_CM_STATE_IDLE;
 252         cm_id_priv->id.device = device;
 253         cm_id_priv->id.cm_handler = cm_handler;
 254         cm_id_priv->id.context = context;
 255         cm_id_priv->id.event_handler = cm_event_handler;
 256         cm_id_priv->id.add_ref = add_ref;
 257         cm_id_priv->id.rem_ref = rem_ref;
 258         spin_lock_init(&cm_id_priv->lock);
 259         atomic_set(&cm_id_priv->refcount, 1);
 260         init_waitqueue_head(&cm_id_priv->connect_wait);
 261         init_completion(&cm_id_priv->destroy_comp);
 262         INIT_LIST_HEAD(&cm_id_priv->work_list);
 263         INIT_LIST_HEAD(&cm_id_priv->work_free_list);
 264
 265         return &cm_id_priv->id;
 266 }
 267 EXPORT_SYMBOL(iw_create_cm_id);
 268
 269
 270 static int iwcm_modify_qp_err(struct ib_qp *qp)
 271 {
 272         struct ib_qp_attr qp_attr;
 273
 274         if (!qp)
 275                 return -EINVAL;
 276
 277         qp_attr.qp_state = IB_QPS_ERR;
 278         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 279 }
 280
 281 /*
 282  * This is really the RDMAC CLOSING state. It is most similar to the
 283  * IB SQD QP state.
 284  */
 285 static int iwcm_modify_qp_sqd(struct ib_qp *qp)
 286 {
 287         struct ib_qp_attr qp_attr;
 288
 289         BUG_ON(qp == NULL);
 290         qp_attr.qp_state = IB_QPS_SQD;
 291         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 292 }
 293
 294 /*
 295  * CM_ID <-- CLOSING
 296  *
 297  * Block if a passive or active connection is currently being processed. Then
 298  * process the event as follows:
 299  * - If we are ESTABLISHED, move to CLOSING and modify the QP state
 300  *   based on the abrupt flag
 301  * - If the connection is already in the CLOSING or IDLE state, the peer is
 302  *   disconnecting concurrently with us and we've already seen the
 303  *   DISCONNECT event -- ignore the request and return 0
 304  * - Disconnect on a listening endpoint returns -EINVAL
 305  */
 306 int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt)
 307 {
 308         struct iwcm_id_private *cm_id_priv;
 309         unsigned long flags;
 310         int ret = 0;
 311         struct ib_qp *qp = NULL;
 312
 313         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 314         /* Wait if we're currently in a connect or accept downcall */
 315         wait_event(cm_id_priv->connect_wait,
 316                    !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 317
 318         spin_lock_irqsave(&cm_id_priv->lock, flags);
 319         switch (cm_id_priv->state) {
 320         case IW_CM_STATE_ESTABLISHED:
 321                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 322
 323                 /* QP could be <nul> for user-mode client */
 324                 if (cm_id_priv->qp)
 325                         qp = cm_id_priv->qp;
 326                 else
 327                         ret = -EINVAL;
 328                 break;
 329         case IW_CM_STATE_LISTEN:
 330                 ret = -EINVAL;
 331                 break;
 332         case IW_CM_STATE_CLOSING:
 333                 /* remote peer closed first */
 334         case IW_CM_STATE_IDLE:
 335                 /* accept or connect returned !0 */
 336                 break;
 337         case IW_CM_STATE_CONN_RECV:
 338                 /*
 339                  * App called disconnect before/without calling accept after
 340                  * connect_request event delivered.
 341                  */
 342                 break;
 343         case IW_CM_STATE_CONN_SENT:
 344                 /* Can only get here if wait above fails */
 345         default:
 346                 BUG();
 347         }
 348         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 349
 350         if (qp) {
 351                 if (abrupt)
 352                         ret = iwcm_modify_qp_err(qp);
 353                 else
 354                         ret = iwcm_modify_qp_sqd(qp);
 355
 356                 /*
 357                  * If both sides are disconnecting the QP could
 358                  * already be in ERR or SQD states
 359                  */
 360                 ret = 0;
 361         }
 362
 363         return ret;
 364 }
 365 EXPORT_SYMBOL(iw_cm_disconnect);
 366
 367 /*
 368  * CM_ID <-- DESTROYING
 369  *
 370  * Clean up all resources associated with the connection and release
 371  * the initial reference taken by iw_create_cm_id.
 372  */
 373 static void destroy_cm_id(struct iw_cm_id *cm_id)
 374 {
 375         struct iwcm_id_private *cm_id_priv;
 376         unsigned long flags;
 377
 378         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 379         /*
 380          * Wait if we're currently in a connect or accept downcall. A
 381          * listening endpoint should never block here.
 382          */
 383         wait_event(cm_id_priv->connect_wait,
 384                    !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 385
 386         /*
 387          * Since we're deleting the cm_id, drop any events that
 388          * might arrive before the last dereference.
 389          */
 390         set_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags);
 391
 392         spin_lock_irqsave(&cm_id_priv->lock, flags);
 393         switch (cm_id_priv->state) {
 394         case IW_CM_STATE_LISTEN:
 395                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 396                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 397                 /* destroy the listening endpoint */
 398                 cm_id->device->iwcm->destroy_listen(cm_id);
 399                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 400                 break;
 401         case IW_CM_STATE_ESTABLISHED:
 402                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 403                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 404                 /* Abrupt close of the connection */
 405                 (void)iwcm_modify_qp_err(cm_id_priv->qp);
 406                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 407                 break;
 408         case IW_CM_STATE_IDLE:
 409         case IW_CM_STATE_CLOSING:
 410                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 411                 break;
 412         case IW_CM_STATE_CONN_RECV:
 413                 /*
 414                  * App called destroy before/without calling accept after
 415                  * receiving connection request event notification or
 416                  * returned non zero from the event callback function.
 417                  * In either case, must tell the provider to reject.
 418                  */
 419                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 420                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 421                 cm_id->device->iwcm->reject(cm_id, NULL, 0);
 422                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 423                 break;
 424         case IW_CM_STATE_CONN_SENT:
 425         case IW_CM_STATE_DESTROYING:
 426         default:
 427                 BUG();
 428                 break;
 429         }
 430         if (cm_id_priv->qp) {
 431                 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
 432                 cm_id_priv->qp = NULL;
 433         }
 434         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 435
 436         if (cm_id->mapped) {
 437                 iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr);
 438                 iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM);
 439         }
 440
 441         (void)iwcm_deref_id(cm_id_priv);
 442 }
 443
 444 /*
 445  * This function is only called by the application thread and cannot
 446  * be called by the event thread. The function will wait for all
 447  * references to be released on the cm_id and then kfree the cm_id
 448  * object.
 449  */
 450 void iw_destroy_cm_id(struct iw_cm_id *cm_id)
 451 {
 452         struct iwcm_id_private *cm_id_priv;
 453
 454         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 455         destroy_cm_id(cm_id);
 456 }
 457 EXPORT_SYMBOL(iw_destroy_cm_id);
 458
 459 /**
 460  * iw_cm_check_wildcard - If IP address is 0 then use original
 461  * @pm_addr: sockaddr containing the ip to check for wildcard
 462  * @cm_addr: sockaddr containing the actual IP address
 463  * @cm_outaddr: sockaddr to set IP addr which leaving port
 464  *
 465  *  Checks the pm_addr for wildcard and then sets cm_outaddr's
 466  *  IP to the actual (cm_addr).
 467  */
 468 static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr,
 469                                  struct sockaddr_storage *cm_addr,
 470                                  struct sockaddr_storage *cm_outaddr)
 471 {
 472         if (pm_addr->ss_family == AF_INET) {
 473                 struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr;
 474
 475                 if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) {
 476                         struct sockaddr_in *cm4_addr =
 477                                 (struct sockaddr_in *)cm_addr;
 478                         struct sockaddr_in *cm4_outaddr =
 479                                 (struct sockaddr_in *)cm_outaddr;
 480
 481                         cm4_outaddr->sin_addr = cm4_addr->sin_addr;
 482                 }
 483         } else {
 484                 struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr;
 485
 486                 if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) {
 487                         struct sockaddr_in6 *cm6_addr =
 488                                 (struct sockaddr_in6 *)cm_addr;
 489                         struct sockaddr_in6 *cm6_outaddr =
 490                                 (struct sockaddr_in6 *)cm_outaddr;
 491
 492                         cm6_outaddr->sin6_addr = cm6_addr->sin6_addr;
 493                 }
 494         }
 495 }
 496
 497 /**
 498  * iw_cm_map - Use portmapper to map the ports
 499  * @cm_id: connection manager pointer
 500  * @active: Indicates the active side when true
 501  * returns nonzero for error only if iwpm_create_mapinfo() fails
 502  *
 503  * Tries to add a mapping for a port using the Portmapper. If
 504  * successful in mapping the IP/Port it will check the remote
 505  * mapped IP address for a wildcard IP address and replace the
 506  * zero IP address with the remote_addr.
 507  */
 508 static int iw_cm_map(struct iw_cm_id *cm_id, bool active)
 509 {
 510         struct iwpm_dev_data pm_reg_msg;
 511         struct iwpm_sa_data pm_msg;
 512         int status;
 513
 514         cm_id->m_local_addr = cm_id->local_addr;
 515         cm_id->m_remote_addr = cm_id->remote_addr;
 516
 517         memcpy(pm_reg_msg.dev_name, cm_id->device->name,
 518                sizeof(pm_reg_msg.dev_name));
 519         memcpy(pm_reg_msg.if_name, cm_id->device->iwcm->ifname,
 520                sizeof(pm_reg_msg.if_name));
 521
 522         if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) ||
 523             !iwpm_valid_pid())
 524                 return 0;
 525
 526         cm_id->mapped = true;
 527         pm_msg.loc_addr = cm_id->local_addr;
 528         pm_msg.rem_addr = cm_id->remote_addr;
 529         if (active)
 530                 status = iwpm_add_and_query_mapping(&pm_msg,
 531                                                     RDMA_NL_IWCM);
 532         else
 533                 status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM);
 534
 535         if (!status) {
 536                 cm_id->m_local_addr = pm_msg.mapped_loc_addr;
 537                 if (active) {
 538                         cm_id->m_remote_addr = pm_msg.mapped_rem_addr;
 539                         iw_cm_check_wildcard(&pm_msg.mapped_rem_addr,
 540                                              &cm_id->remote_addr,
 541                                              &cm_id->m_remote_addr);
 542                 }
 543         }
 544
 545         return iwpm_create_mapinfo(&cm_id->local_addr,
 546                                    &cm_id->m_local_addr,
 547                                    RDMA_NL_IWCM);
 548 }
 549
 550 /*
 551  * CM_ID <-- LISTEN
 552  *
 553  * Start listening for connect requests. Generates one CONNECT_REQUEST
 554  * event for each inbound connect request.
 555  */
 556 int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
 557 {
 558         struct iwcm_id_private *cm_id_priv;
 559         unsigned long flags;
 560         int ret;
 561
 562         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 563
 564         if (!backlog)
 565                 backlog = default_backlog;
 566
 567         ret = alloc_work_entries(cm_id_priv, backlog);
 568         if (ret)
 569                 return ret;
 570
 571         spin_lock_irqsave(&cm_id_priv->lock, flags);
 572         switch (cm_id_priv->state) {
 573         case IW_CM_STATE_IDLE:
 574                 cm_id_priv->state = IW_CM_STATE_LISTEN;
 575                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 576                 ret = iw_cm_map(cm_id, false);
 577                 if (!ret)
 578                         ret = cm_id->device->iwcm->create_listen(cm_id, backlog);
 579                 if (ret)
 580                         cm_id_priv->state = IW_CM_STATE_IDLE;
 581                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 582                 break;
 583         default:
 584                 ret = -EINVAL;
 585         }
 586         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 587
 588         return ret;
 589 }
 590 EXPORT_SYMBOL(iw_cm_listen);
 591
 592 /*
 593  * CM_ID <-- IDLE
 594  *
 595  * Rejects an inbound connection request. No events are generated.
 596  */
 597 int iw_cm_reject(struct iw_cm_id *cm_id,
 598                  const void *private_data,
 599                  u8 private_data_len)
 600 {
 601         struct iwcm_id_private *cm_id_priv;
 602         unsigned long flags;
 603         int ret;
 604
 605         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 606         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 607
 608         spin_lock_irqsave(&cm_id_priv->lock, flags);
 609         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 610                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 611                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 612                 wake_up_all(&cm_id_priv->connect_wait);
 613                 return -EINVAL;
 614         }
 615         cm_id_priv->state = IW_CM_STATE_IDLE;
 616         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 617
 618         ret = cm_id->device->iwcm->reject(cm_id, private_data,
 619                                           private_data_len);
 620
 621         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 622         wake_up_all(&cm_id_priv->connect_wait);
 623
 624         return ret;
 625 }
 626 EXPORT_SYMBOL(iw_cm_reject);
 627
 628 /*
 629  * CM_ID <-- ESTABLISHED
 630  *
 631  * Accepts an inbound connection request and generates an ESTABLISHED
 632  * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
 633  * until the ESTABLISHED event is received from the provider.
 634  */
 635 int iw_cm_accept(struct iw_cm_id *cm_id,
 636                  struct iw_cm_conn_param *iw_param)
 637 {
 638         struct iwcm_id_private *cm_id_priv;
 639         struct ib_qp *qp;
 640         unsigned long flags;
 641         int ret;
 642
 643         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 644         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 645
 646         spin_lock_irqsave(&cm_id_priv->lock, flags);
 647         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 648                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 649                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 650                 wake_up_all(&cm_id_priv->connect_wait);
 651                 return -EINVAL;
 652         }
 653         /* Get the ib_qp given the QPN */
 654         qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
 655         if (!qp) {
 656                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 657                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 658                 wake_up_all(&cm_id_priv->connect_wait);
 659                 return -EINVAL;
 660         }
 661         cm_id->device->iwcm->add_ref(qp);
 662         cm_id_priv->qp = qp;
 663         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 664
 665         ret = cm_id->device->iwcm->accept(cm_id, iw_param);
 666         if (ret) {
 667                 /* An error on accept precludes provider events */
 668                 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 669                 cm_id_priv->state = IW_CM_STATE_IDLE;
 670                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 671                 if (cm_id_priv->qp) {
 672                         cm_id->device->iwcm->rem_ref(qp);
 673                         cm_id_priv->qp = NULL;
 674                 }
 675                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 676                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 677                 wake_up_all(&cm_id_priv->connect_wait);
 678         }
 679
 680         return ret;
 681 }
 682 EXPORT_SYMBOL(iw_cm_accept);
 683
 684 /*
 685  * Active Side: CM_ID <-- CONN_SENT
 686  *
 687  * If successful, results in the generation of a CONNECT_REPLY
 688  * event. iw_cm_disconnect and iw_cm_destroy will block until the
 689  * CONNECT_REPLY event is received from the provider.
 690  */
 691 int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param)
 692 {
 693         struct iwcm_id_private *cm_id_priv;
 694         int ret;
 695         unsigned long flags;
 696         struct ib_qp *qp;
 697
 698         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 699
 700         ret = alloc_work_entries(cm_id_priv, 4);
 701         if (ret)
 702                 return ret;
 703
 704         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 705         spin_lock_irqsave(&cm_id_priv->lock, flags);
 706
 707         if (cm_id_priv->state != IW_CM_STATE_IDLE) {
 708                 ret = -EINVAL;
 709                 goto err;
 710         }
 711
 712         /* Get the ib_qp given the QPN */
 713         qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
 714         if (!qp) {
 715                 ret = -EINVAL;
 716                 goto err;
 717         }
 718         cm_id->device->iwcm->add_ref(qp);
 719         cm_id_priv->qp = qp;
 720         cm_id_priv->state = IW_CM_STATE_CONN_SENT;
 721         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 722
 723         ret = iw_cm_map(cm_id, true);
 724         if (!ret)
 725                 ret = cm_id->device->iwcm->connect(cm_id, iw_param);
 726         if (!ret)
 727                 return 0;       /* success */
 728
 729         spin_lock_irqsave(&cm_id_priv->lock, flags);
 730         if (cm_id_priv->qp) {
 731                 cm_id->device->iwcm->rem_ref(qp);
 732                 cm_id_priv->qp = NULL;
 733         }
 734         cm_id_priv->state = IW_CM_STATE_IDLE;
 735 err:
 736         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 737         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 738         wake_up_all(&cm_id_priv->connect_wait);
 739         return ret;
 740 }
 741 EXPORT_SYMBOL(iw_cm_connect);
 742
 743 /*
 744  * Passive Side: new CM_ID <-- CONN_RECV
 745  *
 746  * Handles an inbound connect request. The function creates a new
 747  * iw_cm_id to represent the new connection and inherits the client
 748  * callback function and other attributes from the listening parent.
 749  *
 750  * The work item contains a pointer to the listen_cm_id and the event. The
 751  * listen_cm_id contains the client cm_handler, context and
 752  * device. These are copied when the device is cloned. The event
 753  * contains the new four tuple.
 754  *
 755  * An error on the child should not affect the parent, so this
 756  * function does not return a value.
 757  */
 758 static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv,
 759                                 struct iw_cm_event *iw_event)
 760 {
 761         unsigned long flags;
 762         struct iw_cm_id *cm_id;
 763         struct iwcm_id_private *cm_id_priv;
 764         int ret;
 765
 766         /*
 767          * The provider should never generate a connection request
 768          * event with a bad status.
 769          */
 770         BUG_ON(iw_event->status);
 771
 772         cm_id = iw_create_cm_id(listen_id_priv->id.device,
 773                                 listen_id_priv->id.cm_handler,
 774                                 listen_id_priv->id.context);
 775         /* If the cm_id could not be created, ignore the request */
 776         if (IS_ERR(cm_id))
 777                 goto out;
 778
 779         cm_id->provider_data = iw_event->provider_data;
 780         cm_id->m_local_addr = iw_event->local_addr;
 781         cm_id->m_remote_addr = iw_event->remote_addr;
 782         cm_id->local_addr = listen_id_priv->id.local_addr;
 783
 784         ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr,
 785                                    &iw_event->remote_addr,
 786                                    &cm_id->remote_addr,
 787                                    RDMA_NL_IWCM);
 788         if (ret) {
 789                 cm_id->remote_addr = iw_event->remote_addr;
 790         } else {
 791                 iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr,
 792                                      &iw_event->local_addr,
 793                                      &cm_id->local_addr);
 794                 iw_event->local_addr = cm_id->local_addr;
 795                 iw_event->remote_addr = cm_id->remote_addr;
 796         }
 797
 798         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 799         cm_id_priv->state = IW_CM_STATE_CONN_RECV;
 800
 801         /*
 802          * We could be destroying the listening id. If so, ignore this
 803          * upcall.
 804          */
 805         spin_lock_irqsave(&listen_id_priv->lock, flags);
 806         if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
 807                 spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 808                 iw_cm_reject(cm_id, NULL, 0);
 809                 iw_destroy_cm_id(cm_id);
 810                 goto out;
 811         }
 812         spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 813
 814         ret = alloc_work_entries(cm_id_priv, 3);
 815         if (ret) {
 816                 iw_cm_reject(cm_id, NULL, 0);
 817                 iw_destroy_cm_id(cm_id);
 818                 goto out;
 819         }
 820
 821         /* Call the client CM handler */
 822         ret = cm_id->cm_handler(cm_id, iw_event);
 823         if (ret) {
 824                 iw_cm_reject(cm_id, NULL, 0);
 825                 iw_destroy_cm_id(cm_id);
 826         }
 827
 828 out:
 829         if (iw_event->private_data_len)
 830                 kfree(iw_event->private_data);
 831 }
 832
 833 /*
 834  * Passive Side: CM_ID <-- ESTABLISHED
 835  *
 836  * The provider generated an ESTABLISHED event which means that
 837  * the MPA negotion has completed successfully and we are now in MPA
 838  * FPDU mode.
 839  *
 840  * This event can only be received in the CONN_RECV state. If the
 841  * remote peer closed, the ESTABLISHED event would be received followed
 842  * by the CLOSE event. If the app closes, it will block until we wake
 843  * it up after processing this event.
 844  */
 845 static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv,
 846                                struct iw_cm_event *iw_event)
 847 {
 848         unsigned long flags;
 849         int ret;
 850
 851         spin_lock_irqsave(&cm_id_priv->lock, flags);
 852
 853         /*
 854          * We clear the CONNECT_WAIT bit here to allow the callback
 855          * function to call iw_cm_disconnect. Calling iw_destroy_cm_id
 856          * from a callback handler is not allowed.
 857          */
 858         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 859         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 860         cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 861         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 862         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 863         wake_up_all(&cm_id_priv->connect_wait);
 864
 865         return ret;
 866 }
 867
 868 /*
 869  * Active Side: CM_ID <-- ESTABLISHED
 870  *
 871  * The app has called connect and is waiting for the established event to
 872  * post it's requests to the server. This event will wake up anyone
 873  * blocked in iw_cm_disconnect or iw_destroy_id.
 874  */
 875 static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv,
 876                                struct iw_cm_event *iw_event)
 877 {
 878         unsigned long flags;
 879         int ret;
 880
 881         spin_lock_irqsave(&cm_id_priv->lock, flags);
 882         /*
 883          * Clear the connect wait bit so a callback function calling
 884          * iw_cm_disconnect will not wait and deadlock this thread
 885          */
 886         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 887         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
 888         if (iw_event->status == 0) {
 889                 cm_id_priv->id.m_local_addr = iw_event->local_addr;
 890                 cm_id_priv->id.m_remote_addr = iw_event->remote_addr;
 891                 iw_event->local_addr = cm_id_priv->id.local_addr;
 892                 iw_event->remote_addr = cm_id_priv->id.remote_addr;
 893                 cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 894         } else {
 895                 /* REJECTED or RESET */
 896                 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
 897                 cm_id_priv->qp = NULL;
 898                 cm_id_priv->state = IW_CM_STATE_IDLE;
 899         }
 900         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 901         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 902
 903         if (iw_event->private_data_len)
 904                 kfree(iw_event->private_data);
 905
 906         /* Wake up waiters on connect complete */
 907         wake_up_all(&cm_id_priv->connect_wait);
 908
 909         return ret;
 910 }
 911
 912 /*
 913  * CM_ID <-- CLOSING
 914  *
 915  * If in the ESTABLISHED state, move to CLOSING.
 916  */
 917 static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv,
 918                                   struct iw_cm_event *iw_event)
 919 {
 920         unsigned long flags;
 921
 922         spin_lock_irqsave(&cm_id_priv->lock, flags);
 923         if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
 924                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 925         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 926 }
 927
 928 /*
 929  * CM_ID <-- IDLE
 930  *
 931  * If in the ESTBLISHED or CLOSING states, the QP will have have been
 932  * moved by the provider to the ERR state. Disassociate the CM_ID from
 933  * the QP,  move to IDLE, and remove the 'connected' reference.
 934  *
 935  * If in some other state, the cm_id was destroyed asynchronously.
 936  * This is the last reference that will result in waking up
 937  * the app thread blocked in iw_destroy_cm_id.
 938  */
 939 static int cm_close_handler(struct iwcm_id_private *cm_id_priv,
 940                                   struct iw_cm_event *iw_event)
 941 {
 942         unsigned long flags;
 943         int ret = 0;
 944         spin_lock_irqsave(&cm_id_priv->lock, flags);
 945
 946         if (cm_id_priv->qp) {
 947                 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
 948                 cm_id_priv->qp = NULL;
 949         }
 950         switch (cm_id_priv->state) {
 951         case IW_CM_STATE_ESTABLISHED:
 952         case IW_CM_STATE_CLOSING:
 953                 cm_id_priv->state = IW_CM_STATE_IDLE;
 954                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 955                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 956                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 957                 break;
 958         case IW_CM_STATE_DESTROYING:
 959                 break;
 960         default:
 961                 BUG();
 962         }
 963         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 964
 965         return ret;
 966 }
 967
 968 static int process_event(struct iwcm_id_private *cm_id_priv,
 969                          struct iw_cm_event *iw_event)
 970 {
 971         int ret = 0;
 972
 973         switch (iw_event->event) {
 974         case IW_CM_EVENT_CONNECT_REQUEST:
 975                 cm_conn_req_handler(cm_id_priv, iw_event);
 976                 break;
 977         case IW_CM_EVENT_CONNECT_REPLY:
 978                 ret = cm_conn_rep_handler(cm_id_priv, iw_event);
 979                 break;
 980         case IW_CM_EVENT_ESTABLISHED:
 981                 ret = cm_conn_est_handler(cm_id_priv, iw_event);
 982                 break;
 983         case IW_CM_EVENT_DISCONNECT:
 984                 cm_disconnect_handler(cm_id_priv, iw_event);
 985                 break;
 986         case IW_CM_EVENT_CLOSE:
 987                 ret = cm_close_handler(cm_id_priv, iw_event);
 988                 break;
 989         default:
 990                 BUG();
 991         }
 992
 993         return ret;
 994 }
 995
 996 /*
 997  * Process events on the work_list for the cm_id. If the callback
 998  * function requests that the cm_id be deleted, a flag is set in the
 999  * cm_id flags to indicate that when the last reference is
1000  * removed, the cm_id is to be destroyed. This is necessary to
1001  * distinguish between an object that will be destroyed by the app
1002  * thread asleep on the destroy_comp list vs. an object destroyed
1003  * here synchronously when the last reference is removed.
1004  */
1005 static void cm_work_handler(struct work_struct *_work)
1006 {
1007         struct iwcm_work *work = container_of(_work, struct iwcm_work, work);
1008         struct iw_cm_event levent;
1009         struct iwcm_id_private *cm_id_priv = work->cm_id;
1010         unsigned long flags;
1011         int empty;
1012         int ret = 0;
1013
1014         spin_lock_irqsave(&cm_id_priv->lock, flags);
1015         empty = list_empty(&cm_id_priv->work_list);
1016         while (!empty) {
1017                 work = list_entry(cm_id_priv->work_list.next,
1018                                   struct iwcm_work, list);
1019                 list_del_init(&work->list);
1020                 empty = list_empty(&cm_id_priv->work_list);
1021                 levent = work->event;
1022                 put_work(work);
1023                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1024
1025                 if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) {
1026                         ret = process_event(cm_id_priv, &levent);
1027                         if (ret)
1028                                 destroy_cm_id(&cm_id_priv->id);
1029                 } else
1030                         pr_debug("dropping event %d\n", levent.event);
1031                 if (iwcm_deref_id(cm_id_priv))
1032                         return;
1033                 if (empty)
1034                         return;
1035                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1036         }
1037         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1038 }
1039
1040 /*
1041  * This function is called on interrupt context. Schedule events on
1042  * the iwcm_wq thread to allow callback functions to downcall into
1043  * the CM and/or block.  Events are queued to a per-CM_ID
1044  * work_list. If this is the first event on the work_list, the work
1045  * element is also queued on the iwcm_wq thread.
1046  *
1047  * Each event holds a reference on the cm_id. Until the last posted
1048  * event has been delivered and processed, the cm_id cannot be
1049  * deleted.
1050  *
1051  * Returns:
1052  *            0 - the event was handled.
1053  *      -ENOMEM - the event was not handled due to lack of resources.
1054  */
1055 static int cm_event_handler(struct iw_cm_id *cm_id,
1056                              struct iw_cm_event *iw_event)
1057 {
1058         struct iwcm_work *work;
1059         struct iwcm_id_private *cm_id_priv;
1060         unsigned long flags;
1061         int ret = 0;
1062
1063         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1064
1065         spin_lock_irqsave(&cm_id_priv->lock, flags);
1066         work = get_work(cm_id_priv);
1067         if (!work) {
1068                 ret = -ENOMEM;
1069                 goto out;
1070         }
1071
1072         INIT_WORK(&work->work, cm_work_handler);
1073         work->cm_id = cm_id_priv;
1074         work->event = *iw_event;
1075
1076         if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST ||
1077              work->event.event == IW_CM_EVENT_CONNECT_REPLY) &&
1078             work->event.private_data_len) {
1079                 ret = copy_private_data(&work->event);
1080                 if (ret) {
1081                         put_work(work);
1082                         goto out;
1083                 }
1084         }
1085
1086         atomic_inc(&cm_id_priv->refcount);
1087         if (list_empty(&cm_id_priv->work_list)) {
1088                 list_add_tail(&work->list, &cm_id_priv->work_list);
1089                 queue_work(iwcm_wq, &work->work);
1090         } else
1091                 list_add_tail(&work->list, &cm_id_priv->work_list);
1092 out:
1093         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1094         return ret;
1095 }
1096
1097 static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv,
1098                                   struct ib_qp_attr *qp_attr,
1099                                   int *qp_attr_mask)
1100 {
1101         unsigned long flags;
1102         int ret;
1103
1104         spin_lock_irqsave(&cm_id_priv->lock, flags);
1105         switch (cm_id_priv->state) {
1106         case IW_CM_STATE_IDLE:
1107         case IW_CM_STATE_CONN_SENT:
1108         case IW_CM_STATE_CONN_RECV:
1109         case IW_CM_STATE_ESTABLISHED:
1110                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1111                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
1112                                            IB_ACCESS_REMOTE_READ;
1113                 ret = 0;
1114                 break;
1115         default:
1116                 ret = -EINVAL;
1117                 break;
1118         }
1119         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1120         return ret;
1121 }
1122
1123 static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
1124                                   struct ib_qp_attr *qp_attr,
1125                                   int *qp_attr_mask)
1126 {
1127         unsigned long flags;
1128         int ret;
1129
1130         spin_lock_irqsave(&cm_id_priv->lock, flags);
1131         switch (cm_id_priv->state) {
1132         case IW_CM_STATE_IDLE:
1133         case IW_CM_STATE_CONN_SENT:
1134         case IW_CM_STATE_CONN_RECV:
1135         case IW_CM_STATE_ESTABLISHED:
1136                 *qp_attr_mask = 0;
1137                 ret = 0;
1138                 break;
1139         default:
1140                 ret = -EINVAL;
1141                 break;
1142         }
1143         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1144         return ret;
1145 }
1146
1147 int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
1148                        struct ib_qp_attr *qp_attr,
1149                        int *qp_attr_mask)
1150 {
1151         struct iwcm_id_private *cm_id_priv;
1152         int ret;
1153
1154         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1155         switch (qp_attr->qp_state) {
1156         case IB_QPS_INIT:
1157         case IB_QPS_RTR:
1158                 ret = iwcm_init_qp_init_attr(cm_id_priv,
1159                                              qp_attr, qp_attr_mask);
1160                 break;
1161         case IB_QPS_RTS:
1162                 ret = iwcm_init_qp_rts_attr(cm_id_priv,
1163                                             qp_attr, qp_attr_mask);
1164                 break;
1165         default:
1166                 ret = -EINVAL;
1167                 break;
1168         }
1169         return ret;
1170 }
1171 EXPORT_SYMBOL(iw_cm_init_qp_attr);
1172
1173 static int __init iw_cm_init(void)
1174 {
1175         int ret;
1176
1177         ret = iwpm_init(RDMA_NL_IWCM);
1178         if (ret)
1179                 return ret;
1180
1181         iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", 0);
1182         if (!iwcm_wq)
1183                 goto err_alloc;
1184
1185         iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm",
1186                                                  iwcm_ctl_table);
1187         if (!iwcm_ctl_table_hdr) {
1188                 pr_err("iw_cm: couldn't register sysctl paths\n");
1189                 goto err_sysctl;
1190         }
1191
1192         rdma_nl_register(RDMA_NL_IWCM, iwcm_nl_cb_table);
1193         return 0;
1194
1195 err_sysctl:
1196         destroy_workqueue(iwcm_wq);
1197 err_alloc:
1198         iwpm_exit(RDMA_NL_IWCM);
1199         return -ENOMEM;
1200 }
1201
1202 static void __exit iw_cm_cleanup(void)
1203 {
1204         rdma_nl_unregister(RDMA_NL_IWCM);
1205         unregister_net_sysctl_table(iwcm_ctl_table_hdr);
1206         destroy_workqueue(iwcm_wq);
1207         iwpm_exit(RDMA_NL_IWCM);
1208 }
1209
1210 MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2);
1211
1212 module_init(iw_cm_init);
1213 module_exit(iw_cm_cleanup);