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 struct ibnl_client_cbs iwcm_nl_cb_table[] = {
  63         [RDMA_NL_IWPM_REG_PID] = {.dump = iwpm_register_pid_cb},
  64         [RDMA_NL_IWPM_ADD_MAPPING] = {.dump = iwpm_add_mapping_cb},
  65         [RDMA_NL_IWPM_QUERY_MAPPING] = {.dump = iwpm_add_and_query_mapping_cb},
  66         [RDMA_NL_IWPM_REMOTE_INFO] = {.dump = iwpm_remote_info_cb},
  67         [RDMA_NL_IWPM_HANDLE_ERR] = {.dump = iwpm_mapping_error_cb},
  68         [RDMA_NL_IWPM_MAPINFO] = {.dump = iwpm_mapping_info_cb},
  69         [RDMA_NL_IWPM_MAPINFO_NUM] = {.dump = iwpm_ack_mapping_info_cb}
  70 };
  71
  72 static struct workqueue_struct *iwcm_wq;
  73 struct iwcm_work {
  74         struct work_struct work;
  75         struct iwcm_id_private *cm_id;
  76         struct list_head list;
  77         struct iw_cm_event event;
  78         struct list_head free_list;
  79 };
  80
  81 static unsigned int default_backlog = 256;
  82
  83 static struct ctl_table_header *iwcm_ctl_table_hdr;
  84 static struct ctl_table iwcm_ctl_table[] = {
  85         {
  86                 .procname       = "default_backlog",
  87                 .data           = &default_backlog,
  88                 .maxlen         = sizeof(default_backlog),
  89                 .mode           = 0644,
  90                 .proc_handler   = proc_dointvec,
  91         },
  92         { }
  93 };
  94
  95 /*
  96  * The following services provide a mechanism for pre-allocating iwcm_work
  97  * elements.  The design pre-allocates them  based on the cm_id type:
  98  *      LISTENING IDS:  Get enough elements preallocated to handle the
  99  *                      listen backlog.
 100  *      ACTIVE IDS:     4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE
 101  *      PASSIVE IDS:    3: ESTABLISHED, DISCONNECT, CLOSE
 102  *
 103  * Allocating them in connect and listen avoids having to deal
 104  * with allocation failures on the event upcall from the provider (which
 105  * is called in the interrupt context).
 106  *
 107  * One exception is when creating the cm_id for incoming connection requests.
 108  * There are two cases:
 109  * 1) in the event upcall, cm_event_handler(), for a listening cm_id.  If
 110  *    the backlog is exceeded, then no more connection request events will
 111  *    be processed.  cm_event_handler() returns -ENOMEM in this case.  Its up
 112  *    to the provider to reject the connection request.
 113  * 2) in the connection request workqueue handler, cm_conn_req_handler().
 114  *    If work elements cannot be allocated for the new connect request cm_id,
 115  *    then IWCM will call the provider reject method.  This is ok since
 116  *    cm_conn_req_handler() runs in the workqueue thread context.
 117  */
 118
 119 static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv)
 120 {
 121         struct iwcm_work *work;
 122
 123         if (list_empty(&cm_id_priv->work_free_list))
 124                 return NULL;
 125         work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work,
 126                           free_list);
 127         list_del_init(&work->free_list);
 128         return work;
 129 }
 130
 131 static void put_work(struct iwcm_work *work)
 132 {
 133         list_add(&work->free_list, &work->cm_id->work_free_list);
 134 }
 135
 136 static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv)
 137 {
 138         struct list_head *e, *tmp;
 139
 140         list_for_each_safe(e, tmp, &cm_id_priv->work_free_list)
 141                 kfree(list_entry(e, struct iwcm_work, free_list));
 142 }
 143
 144 static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count)
 145 {
 146         struct iwcm_work *work;
 147
 148         BUG_ON(!list_empty(&cm_id_priv->work_free_list));
 149         while (count--) {
 150                 work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL);
 151                 if (!work) {
 152                         dealloc_work_entries(cm_id_priv);
 153                         return -ENOMEM;
 154                 }
 155                 work->cm_id = cm_id_priv;
 156                 INIT_LIST_HEAD(&work->list);
 157                 put_work(work);
 158         }
 159         return 0;
 160 }
 161
 162 /*
 163  * Save private data from incoming connection requests to
 164  * iw_cm_event, so the low level driver doesn't have to. Adjust
 165  * the event ptr to point to the local copy.
 166  */
 167 static int copy_private_data(struct iw_cm_event *event)
 168 {
 169         void *p;
 170
 171         p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC);
 172         if (!p)
 173                 return -ENOMEM;
 174         event->private_data = p;
 175         return 0;
 176 }
 177
 178 static void free_cm_id(struct iwcm_id_private *cm_id_priv)
 179 {
 180         dealloc_work_entries(cm_id_priv);
 181         kfree(cm_id_priv);
 182 }
 183
 184 /*
 185  * Release a reference on cm_id. If the last reference is being
 186  * released, enable the waiting thread (in iw_destroy_cm_id) to
 187  * get woken up, and return 1 if a thread is already waiting.
 188  */
 189 static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
 190 {
 191         BUG_ON(atomic_read(&cm_id_priv->refcount)==0);
 192         if (atomic_dec_and_test(&cm_id_priv->refcount)) {
 193                 BUG_ON(!list_empty(&cm_id_priv->work_list));
 194                 complete(&cm_id_priv->destroy_comp);
 195                 return 1;
 196         }
 197
 198         return 0;
 199 }
 200
 201 static void add_ref(struct iw_cm_id *cm_id)
 202 {
 203         struct iwcm_id_private *cm_id_priv;
 204         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 205         atomic_inc(&cm_id_priv->refcount);
 206 }
 207
 208 static void rem_ref(struct iw_cm_id *cm_id)
 209 {
 210         struct iwcm_id_private *cm_id_priv;
 211         int cb_destroy;
 212
 213         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 214
 215         /*
 216          * Test bit before deref in case the cm_id gets freed on another
 217          * thread.
 218          */
 219         cb_destroy = test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
 220         if (iwcm_deref_id(cm_id_priv) && cb_destroy) {
 221                 BUG_ON(!list_empty(&cm_id_priv->work_list));
 222                 free_cm_id(cm_id_priv);
 223         }
 224 }
 225
 226 static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event);
 227
 228 struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
 229                                  iw_cm_handler cm_handler,
 230                                  void *context)
 231 {
 232         struct iwcm_id_private *cm_id_priv;
 233
 234         cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL);
 235         if (!cm_id_priv)
 236                 return ERR_PTR(-ENOMEM);
 237
 238         cm_id_priv->state = IW_CM_STATE_IDLE;
 239         cm_id_priv->id.device = device;
 240         cm_id_priv->id.cm_handler = cm_handler;
 241         cm_id_priv->id.context = context;
 242         cm_id_priv->id.event_handler = cm_event_handler;
 243         cm_id_priv->id.add_ref = add_ref;
 244         cm_id_priv->id.rem_ref = rem_ref;
 245         spin_lock_init(&cm_id_priv->lock);
 246         atomic_set(&cm_id_priv->refcount, 1);
 247         init_waitqueue_head(&cm_id_priv->connect_wait);
 248         init_completion(&cm_id_priv->destroy_comp);
 249         INIT_LIST_HEAD(&cm_id_priv->work_list);
 250         INIT_LIST_HEAD(&cm_id_priv->work_free_list);
 251
 252         return &cm_id_priv->id;
 253 }
 254 EXPORT_SYMBOL(iw_create_cm_id);
 255
 256
 257 static int iwcm_modify_qp_err(struct ib_qp *qp)
 258 {
 259         struct ib_qp_attr qp_attr;
 260
 261         if (!qp)
 262                 return -EINVAL;
 263
 264         qp_attr.qp_state = IB_QPS_ERR;
 265         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 266 }
 267
 268 /*
 269  * This is really the RDMAC CLOSING state. It is most similar to the
 270  * IB SQD QP state.
 271  */
 272 static int iwcm_modify_qp_sqd(struct ib_qp *qp)
 273 {
 274         struct ib_qp_attr qp_attr;
 275
 276         BUG_ON(qp == NULL);
 277         qp_attr.qp_state = IB_QPS_SQD;
 278         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 279 }
 280
 281 /*
 282  * CM_ID <-- CLOSING
 283  *
 284  * Block if a passive or active connection is currently being processed. Then
 285  * process the event as follows:
 286  * - If we are ESTABLISHED, move to CLOSING and modify the QP state
 287  *   based on the abrupt flag
 288  * - If the connection is already in the CLOSING or IDLE state, the peer is
 289  *   disconnecting concurrently with us and we've already seen the
 290  *   DISCONNECT event -- ignore the request and return 0
 291  * - Disconnect on a listening endpoint returns -EINVAL
 292  */
 293 int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt)
 294 {
 295         struct iwcm_id_private *cm_id_priv;
 296         unsigned long flags;
 297         int ret = 0;
 298         struct ib_qp *qp = NULL;
 299
 300         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 301         /* Wait if we're currently in a connect or accept downcall */
 302         wait_event(cm_id_priv->connect_wait,
 303                    !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 304
 305         spin_lock_irqsave(&cm_id_priv->lock, flags);
 306         switch (cm_id_priv->state) {
 307         case IW_CM_STATE_ESTABLISHED:
 308                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 309
 310                 /* QP could be <nul> for user-mode client */
 311                 if (cm_id_priv->qp)
 312                         qp = cm_id_priv->qp;
 313                 else
 314                         ret = -EINVAL;
 315                 break;
 316         case IW_CM_STATE_LISTEN:
 317                 ret = -EINVAL;
 318                 break;
 319         case IW_CM_STATE_CLOSING:
 320                 /* remote peer closed first */
 321         case IW_CM_STATE_IDLE:
 322                 /* accept or connect returned !0 */
 323                 break;
 324         case IW_CM_STATE_CONN_RECV:
 325                 /*
 326                  * App called disconnect before/without calling accept after
 327                  * connect_request event delivered.
 328                  */
 329                 break;
 330         case IW_CM_STATE_CONN_SENT:
 331                 /* Can only get here if wait above fails */
 332         default:
 333                 BUG();
 334         }
 335         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 336
 337         if (qp) {
 338                 if (abrupt)
 339                         ret = iwcm_modify_qp_err(qp);
 340                 else
 341                         ret = iwcm_modify_qp_sqd(qp);
 342
 343                 /*
 344                  * If both sides are disconnecting the QP could
 345                  * already be in ERR or SQD states
 346                  */
 347                 ret = 0;
 348         }
 349
 350         return ret;
 351 }
 352 EXPORT_SYMBOL(iw_cm_disconnect);
 353
 354 /*
 355  * CM_ID <-- DESTROYING
 356  *
 357  * Clean up all resources associated with the connection and release
 358  * the initial reference taken by iw_create_cm_id.
 359  */
 360 static void destroy_cm_id(struct iw_cm_id *cm_id)
 361 {
 362         struct iwcm_id_private *cm_id_priv;
 363         unsigned long flags;
 364
 365         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 366         /*
 367          * Wait if we're currently in a connect or accept downcall. A
 368          * listening endpoint should never block here.
 369          */
 370         wait_event(cm_id_priv->connect_wait,
 371                    !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 372
 373         spin_lock_irqsave(&cm_id_priv->lock, flags);
 374         switch (cm_id_priv->state) {
 375         case IW_CM_STATE_LISTEN:
 376                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 377                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 378                 /* destroy the listening endpoint */
 379                 cm_id->device->iwcm->destroy_listen(cm_id);
 380                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 381                 break;
 382         case IW_CM_STATE_ESTABLISHED:
 383                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 384                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 385                 /* Abrupt close of the connection */
 386                 (void)iwcm_modify_qp_err(cm_id_priv->qp);
 387                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 388                 break;
 389         case IW_CM_STATE_IDLE:
 390         case IW_CM_STATE_CLOSING:
 391                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 392                 break;
 393         case IW_CM_STATE_CONN_RECV:
 394                 /*
 395                  * App called destroy before/without calling accept after
 396                  * receiving connection request event notification or
 397                  * returned non zero from the event callback function.
 398                  * In either case, must tell the provider to reject.
 399                  */
 400                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 401                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 402                 cm_id->device->iwcm->reject(cm_id, NULL, 0);
 403                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 404                 break;
 405         case IW_CM_STATE_CONN_SENT:
 406         case IW_CM_STATE_DESTROYING:
 407         default:
 408                 BUG();
 409                 break;
 410         }
 411         if (cm_id_priv->qp) {
 412                 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
 413                 cm_id_priv->qp = NULL;
 414         }
 415         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 416
 417         if (cm_id->mapped) {
 418                 iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr);
 419                 iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM);
 420         }
 421
 422         (void)iwcm_deref_id(cm_id_priv);
 423 }
 424
 425 /*
 426  * This function is only called by the application thread and cannot
 427  * be called by the event thread. The function will wait for all
 428  * references to be released on the cm_id and then kfree the cm_id
 429  * object.
 430  */
 431 void iw_destroy_cm_id(struct iw_cm_id *cm_id)
 432 {
 433         struct iwcm_id_private *cm_id_priv;
 434
 435         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 436         BUG_ON(test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags));
 437
 438         destroy_cm_id(cm_id);
 439
 440         wait_for_completion(&cm_id_priv->destroy_comp);
 441
 442         free_cm_id(cm_id_priv);
 443 }
 444 EXPORT_SYMBOL(iw_destroy_cm_id);
 445
 446 /**
 447  * iw_cm_check_wildcard - If IP address is 0 then use original
 448  * @pm_addr: sockaddr containing the ip to check for wildcard
 449  * @cm_addr: sockaddr containing the actual IP address
 450  * @cm_outaddr: sockaddr to set IP addr which leaving port
 451  *
 452  *  Checks the pm_addr for wildcard and then sets cm_outaddr's
 453  *  IP to the actual (cm_addr).
 454  */
 455 static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr,
 456                                  struct sockaddr_storage *cm_addr,
 457                                  struct sockaddr_storage *cm_outaddr)
 458 {
 459         if (pm_addr->ss_family == AF_INET) {
 460                 struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr;
 461
 462                 if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) {
 463                         struct sockaddr_in *cm4_addr =
 464                                 (struct sockaddr_in *)cm_addr;
 465                         struct sockaddr_in *cm4_outaddr =
 466                                 (struct sockaddr_in *)cm_outaddr;
 467
 468                         cm4_outaddr->sin_addr = cm4_addr->sin_addr;
 469                 }
 470         } else {
 471                 struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr;
 472
 473                 if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) {
 474                         struct sockaddr_in6 *cm6_addr =
 475                                 (struct sockaddr_in6 *)cm_addr;
 476                         struct sockaddr_in6 *cm6_outaddr =
 477                                 (struct sockaddr_in6 *)cm_outaddr;
 478
 479                         cm6_outaddr->sin6_addr = cm6_addr->sin6_addr;
 480                 }
 481         }
 482 }
 483
 484 /**
 485  * iw_cm_map - Use portmapper to map the ports
 486  * @cm_id: connection manager pointer
 487  * @active: Indicates the active side when true
 488  * returns nonzero for error only if iwpm_create_mapinfo() fails
 489  *
 490  * Tries to add a mapping for a port using the Portmapper. If
 491  * successful in mapping the IP/Port it will check the remote
 492  * mapped IP address for a wildcard IP address and replace the
 493  * zero IP address with the remote_addr.
 494  */
 495 static int iw_cm_map(struct iw_cm_id *cm_id, bool active)
 496 {
 497         struct iwpm_dev_data pm_reg_msg;
 498         struct iwpm_sa_data pm_msg;
 499         int status;
 500
 501         cm_id->m_local_addr = cm_id->local_addr;
 502         cm_id->m_remote_addr = cm_id->remote_addr;
 503
 504         memcpy(pm_reg_msg.dev_name, cm_id->device->name,
 505                sizeof(pm_reg_msg.dev_name));
 506         memcpy(pm_reg_msg.if_name, cm_id->device->iwcm->ifname,
 507                sizeof(pm_reg_msg.if_name));
 508
 509         if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) ||
 510             !iwpm_valid_pid())
 511                 return 0;
 512
 513         cm_id->mapped = true;
 514         pm_msg.loc_addr = cm_id->local_addr;
 515         pm_msg.rem_addr = cm_id->remote_addr;
 516         if (active)
 517                 status = iwpm_add_and_query_mapping(&pm_msg,
 518                                                     RDMA_NL_IWCM);
 519         else
 520                 status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM);
 521
 522         if (!status) {
 523                 cm_id->m_local_addr = pm_msg.mapped_loc_addr;
 524                 if (active) {
 525                         cm_id->m_remote_addr = pm_msg.mapped_rem_addr;
 526                         iw_cm_check_wildcard(&pm_msg.mapped_rem_addr,
 527                                              &cm_id->remote_addr,
 528                                              &cm_id->m_remote_addr);
 529                 }
 530         }
 531
 532         return iwpm_create_mapinfo(&cm_id->local_addr,
 533                                    &cm_id->m_local_addr,
 534                                    RDMA_NL_IWCM);
 535 }
 536
 537 /*
 538  * CM_ID <-- LISTEN
 539  *
 540  * Start listening for connect requests. Generates one CONNECT_REQUEST
 541  * event for each inbound connect request.
 542  */
 543 int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
 544 {
 545         struct iwcm_id_private *cm_id_priv;
 546         unsigned long flags;
 547         int ret;
 548
 549         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 550
 551         if (!backlog)
 552                 backlog = default_backlog;
 553
 554         ret = alloc_work_entries(cm_id_priv, backlog);
 555         if (ret)
 556                 return ret;
 557
 558         spin_lock_irqsave(&cm_id_priv->lock, flags);
 559         switch (cm_id_priv->state) {
 560         case IW_CM_STATE_IDLE:
 561                 cm_id_priv->state = IW_CM_STATE_LISTEN;
 562                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 563                 ret = iw_cm_map(cm_id, false);
 564                 if (!ret)
 565                         ret = cm_id->device->iwcm->create_listen(cm_id, backlog);
 566                 if (ret)
 567                         cm_id_priv->state = IW_CM_STATE_IDLE;
 568                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 569                 break;
 570         default:
 571                 ret = -EINVAL;
 572         }
 573         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 574
 575         return ret;
 576 }
 577 EXPORT_SYMBOL(iw_cm_listen);
 578
 579 /*
 580  * CM_ID <-- IDLE
 581  *
 582  * Rejects an inbound connection request. No events are generated.
 583  */
 584 int iw_cm_reject(struct iw_cm_id *cm_id,
 585                  const void *private_data,
 586                  u8 private_data_len)
 587 {
 588         struct iwcm_id_private *cm_id_priv;
 589         unsigned long flags;
 590         int ret;
 591
 592         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 593         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 594
 595         spin_lock_irqsave(&cm_id_priv->lock, flags);
 596         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 597                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 598                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 599                 wake_up_all(&cm_id_priv->connect_wait);
 600                 return -EINVAL;
 601         }
 602         cm_id_priv->state = IW_CM_STATE_IDLE;
 603         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 604
 605         ret = cm_id->device->iwcm->reject(cm_id, private_data,
 606                                           private_data_len);
 607
 608         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 609         wake_up_all(&cm_id_priv->connect_wait);
 610
 611         return ret;
 612 }
 613 EXPORT_SYMBOL(iw_cm_reject);
 614
 615 /*
 616  * CM_ID <-- ESTABLISHED
 617  *
 618  * Accepts an inbound connection request and generates an ESTABLISHED
 619  * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
 620  * until the ESTABLISHED event is received from the provider.
 621  */
 622 int iw_cm_accept(struct iw_cm_id *cm_id,
 623                  struct iw_cm_conn_param *iw_param)
 624 {
 625         struct iwcm_id_private *cm_id_priv;
 626         struct ib_qp *qp;
 627         unsigned long flags;
 628         int ret;
 629
 630         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 631         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 632
 633         spin_lock_irqsave(&cm_id_priv->lock, flags);
 634         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 635                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 636                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 637                 wake_up_all(&cm_id_priv->connect_wait);
 638                 return -EINVAL;
 639         }
 640         /* Get the ib_qp given the QPN */
 641         qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
 642         if (!qp) {
 643                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 644                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 645                 wake_up_all(&cm_id_priv->connect_wait);
 646                 return -EINVAL;
 647         }
 648         cm_id->device->iwcm->add_ref(qp);
 649         cm_id_priv->qp = qp;
 650         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 651
 652         ret = cm_id->device->iwcm->accept(cm_id, iw_param);
 653         if (ret) {
 654                 /* An error on accept precludes provider events */
 655                 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 656                 cm_id_priv->state = IW_CM_STATE_IDLE;
 657                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 658                 if (cm_id_priv->qp) {
 659                         cm_id->device->iwcm->rem_ref(qp);
 660                         cm_id_priv->qp = NULL;
 661                 }
 662                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 663                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 664                 wake_up_all(&cm_id_priv->connect_wait);
 665         }
 666
 667         return ret;
 668 }
 669 EXPORT_SYMBOL(iw_cm_accept);
 670
 671 /*
 672  * Active Side: CM_ID <-- CONN_SENT
 673  *
 674  * If successful, results in the generation of a CONNECT_REPLY
 675  * event. iw_cm_disconnect and iw_cm_destroy will block until the
 676  * CONNECT_REPLY event is received from the provider.
 677  */
 678 int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param)
 679 {
 680         struct iwcm_id_private *cm_id_priv;
 681         int ret;
 682         unsigned long flags;
 683         struct ib_qp *qp;
 684
 685         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 686
 687         ret = alloc_work_entries(cm_id_priv, 4);
 688         if (ret)
 689                 return ret;
 690
 691         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 692         spin_lock_irqsave(&cm_id_priv->lock, flags);
 693
 694         if (cm_id_priv->state != IW_CM_STATE_IDLE) {
 695                 ret = -EINVAL;
 696                 goto err;
 697         }
 698
 699         /* Get the ib_qp given the QPN */
 700         qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
 701         if (!qp) {
 702                 ret = -EINVAL;
 703                 goto err;
 704         }
 705         cm_id->device->iwcm->add_ref(qp);
 706         cm_id_priv->qp = qp;
 707         cm_id_priv->state = IW_CM_STATE_CONN_SENT;
 708         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 709
 710         ret = iw_cm_map(cm_id, true);
 711         if (!ret)
 712                 ret = cm_id->device->iwcm->connect(cm_id, iw_param);
 713         if (!ret)
 714                 return 0;       /* success */
 715
 716         spin_lock_irqsave(&cm_id_priv->lock, flags);
 717         if (cm_id_priv->qp) {
 718                 cm_id->device->iwcm->rem_ref(qp);
 719                 cm_id_priv->qp = NULL;
 720         }
 721         cm_id_priv->state = IW_CM_STATE_IDLE;
 722 err:
 723         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 724         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 725         wake_up_all(&cm_id_priv->connect_wait);
 726         return ret;
 727 }
 728 EXPORT_SYMBOL(iw_cm_connect);
 729
 730 /*
 731  * Passive Side: new CM_ID <-- CONN_RECV
 732  *
 733  * Handles an inbound connect request. The function creates a new
 734  * iw_cm_id to represent the new connection and inherits the client
 735  * callback function and other attributes from the listening parent.
 736  *
 737  * The work item contains a pointer to the listen_cm_id and the event. The
 738  * listen_cm_id contains the client cm_handler, context and
 739  * device. These are copied when the device is cloned. The event
 740  * contains the new four tuple.
 741  *
 742  * An error on the child should not affect the parent, so this
 743  * function does not return a value.
 744  */
 745 static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv,
 746                                 struct iw_cm_event *iw_event)
 747 {
 748         unsigned long flags;
 749         struct iw_cm_id *cm_id;
 750         struct iwcm_id_private *cm_id_priv;
 751         int ret;
 752
 753         /*
 754          * The provider should never generate a connection request
 755          * event with a bad status.
 756          */
 757         BUG_ON(iw_event->status);
 758
 759         cm_id = iw_create_cm_id(listen_id_priv->id.device,
 760                                 listen_id_priv->id.cm_handler,
 761                                 listen_id_priv->id.context);
 762         /* If the cm_id could not be created, ignore the request */
 763         if (IS_ERR(cm_id))
 764                 goto out;
 765
 766         cm_id->provider_data = iw_event->provider_data;
 767         cm_id->m_local_addr = iw_event->local_addr;
 768         cm_id->m_remote_addr = iw_event->remote_addr;
 769         cm_id->local_addr = listen_id_priv->id.local_addr;
 770
 771         ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr,
 772                                    &iw_event->remote_addr,
 773                                    &cm_id->remote_addr,
 774                                    RDMA_NL_IWCM);
 775         if (ret) {
 776                 cm_id->remote_addr = iw_event->remote_addr;
 777         } else {
 778                 iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr,
 779                                      &iw_event->local_addr,
 780                                      &cm_id->local_addr);
 781                 iw_event->local_addr = cm_id->local_addr;
 782                 iw_event->remote_addr = cm_id->remote_addr;
 783         }
 784
 785         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 786         cm_id_priv->state = IW_CM_STATE_CONN_RECV;
 787
 788         /*
 789          * We could be destroying the listening id. If so, ignore this
 790          * upcall.
 791          */
 792         spin_lock_irqsave(&listen_id_priv->lock, flags);
 793         if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
 794                 spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 795                 iw_cm_reject(cm_id, NULL, 0);
 796                 iw_destroy_cm_id(cm_id);
 797                 goto out;
 798         }
 799         spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 800
 801         ret = alloc_work_entries(cm_id_priv, 3);
 802         if (ret) {
 803                 iw_cm_reject(cm_id, NULL, 0);
 804                 iw_destroy_cm_id(cm_id);
 805                 goto out;
 806         }
 807
 808         /* Call the client CM handler */
 809         ret = cm_id->cm_handler(cm_id, iw_event);
 810         if (ret) {
 811                 iw_cm_reject(cm_id, NULL, 0);
 812                 set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
 813                 destroy_cm_id(cm_id);
 814                 if (atomic_read(&cm_id_priv->refcount)==0)
 815                         free_cm_id(cm_id_priv);
 816         }
 817
 818 out:
 819         if (iw_event->private_data_len)
 820                 kfree(iw_event->private_data);
 821 }
 822
 823 /*
 824  * Passive Side: CM_ID <-- ESTABLISHED
 825  *
 826  * The provider generated an ESTABLISHED event which means that
 827  * the MPA negotion has completed successfully and we are now in MPA
 828  * FPDU mode.
 829  *
 830  * This event can only be received in the CONN_RECV state. If the
 831  * remote peer closed, the ESTABLISHED event would be received followed
 832  * by the CLOSE event. If the app closes, it will block until we wake
 833  * it up after processing this event.
 834  */
 835 static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv,
 836                                struct iw_cm_event *iw_event)
 837 {
 838         unsigned long flags;
 839         int ret;
 840
 841         spin_lock_irqsave(&cm_id_priv->lock, flags);
 842
 843         /*
 844          * We clear the CONNECT_WAIT bit here to allow the callback
 845          * function to call iw_cm_disconnect. Calling iw_destroy_cm_id
 846          * from a callback handler is not allowed.
 847          */
 848         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 849         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 850         cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 851         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 852         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 853         wake_up_all(&cm_id_priv->connect_wait);
 854
 855         return ret;
 856 }
 857
 858 /*
 859  * Active Side: CM_ID <-- ESTABLISHED
 860  *
 861  * The app has called connect and is waiting for the established event to
 862  * post it's requests to the server. This event will wake up anyone
 863  * blocked in iw_cm_disconnect or iw_destroy_id.
 864  */
 865 static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv,
 866                                struct iw_cm_event *iw_event)
 867 {
 868         unsigned long flags;
 869         int ret;
 870
 871         spin_lock_irqsave(&cm_id_priv->lock, flags);
 872         /*
 873          * Clear the connect wait bit so a callback function calling
 874          * iw_cm_disconnect will not wait and deadlock this thread
 875          */
 876         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 877         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
 878         if (iw_event->status == 0) {
 879                 cm_id_priv->id.m_local_addr = iw_event->local_addr;
 880                 cm_id_priv->id.m_remote_addr = iw_event->remote_addr;
 881                 iw_event->local_addr = cm_id_priv->id.local_addr;
 882                 iw_event->remote_addr = cm_id_priv->id.remote_addr;
 883                 cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 884         } else {
 885                 /* REJECTED or RESET */
 886                 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
 887                 cm_id_priv->qp = NULL;
 888                 cm_id_priv->state = IW_CM_STATE_IDLE;
 889         }
 890         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 891         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 892
 893         if (iw_event->private_data_len)
 894                 kfree(iw_event->private_data);
 895
 896         /* Wake up waiters on connect complete */
 897         wake_up_all(&cm_id_priv->connect_wait);
 898
 899         return ret;
 900 }
 901
 902 /*
 903  * CM_ID <-- CLOSING
 904  *
 905  * If in the ESTABLISHED state, move to CLOSING.
 906  */
 907 static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv,
 908                                   struct iw_cm_event *iw_event)
 909 {
 910         unsigned long flags;
 911
 912         spin_lock_irqsave(&cm_id_priv->lock, flags);
 913         if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
 914                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 915         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 916 }
 917
 918 /*
 919  * CM_ID <-- IDLE
 920  *
 921  * If in the ESTBLISHED or CLOSING states, the QP will have have been
 922  * moved by the provider to the ERR state. Disassociate the CM_ID from
 923  * the QP,  move to IDLE, and remove the 'connected' reference.
 924  *
 925  * If in some other state, the cm_id was destroyed asynchronously.
 926  * This is the last reference that will result in waking up
 927  * the app thread blocked in iw_destroy_cm_id.
 928  */
 929 static int cm_close_handler(struct iwcm_id_private *cm_id_priv,
 930                                   struct iw_cm_event *iw_event)
 931 {
 932         unsigned long flags;
 933         int ret = 0;
 934         spin_lock_irqsave(&cm_id_priv->lock, flags);
 935
 936         if (cm_id_priv->qp) {
 937                 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
 938                 cm_id_priv->qp = NULL;
 939         }
 940         switch (cm_id_priv->state) {
 941         case IW_CM_STATE_ESTABLISHED:
 942         case IW_CM_STATE_CLOSING:
 943                 cm_id_priv->state = IW_CM_STATE_IDLE;
 944                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 945                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 946                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 947                 break;
 948         case IW_CM_STATE_DESTROYING:
 949                 break;
 950         default:
 951                 BUG();
 952         }
 953         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 954
 955         return ret;
 956 }
 957
 958 static int process_event(struct iwcm_id_private *cm_id_priv,
 959                          struct iw_cm_event *iw_event)
 960 {
 961         int ret = 0;
 962
 963         switch (iw_event->event) {
 964         case IW_CM_EVENT_CONNECT_REQUEST:
 965                 cm_conn_req_handler(cm_id_priv, iw_event);
 966                 break;
 967         case IW_CM_EVENT_CONNECT_REPLY:
 968                 ret = cm_conn_rep_handler(cm_id_priv, iw_event);
 969                 break;
 970         case IW_CM_EVENT_ESTABLISHED:
 971                 ret = cm_conn_est_handler(cm_id_priv, iw_event);
 972                 break;
 973         case IW_CM_EVENT_DISCONNECT:
 974                 cm_disconnect_handler(cm_id_priv, iw_event);
 975                 break;
 976         case IW_CM_EVENT_CLOSE:
 977                 ret = cm_close_handler(cm_id_priv, iw_event);
 978                 break;
 979         default:
 980                 BUG();
 981         }
 982
 983         return ret;
 984 }
 985
 986 /*
 987  * Process events on the work_list for the cm_id. If the callback
 988  * function requests that the cm_id be deleted, a flag is set in the
 989  * cm_id flags to indicate that when the last reference is
 990  * removed, the cm_id is to be destroyed. This is necessary to
 991  * distinguish between an object that will be destroyed by the app
 992  * thread asleep on the destroy_comp list vs. an object destroyed
 993  * here synchronously when the last reference is removed.
 994  */
 995 static void cm_work_handler(struct work_struct *_work)
 996 {
 997         struct iwcm_work *work = container_of(_work, struct iwcm_work, work);
 998         struct iw_cm_event levent;
 999         struct iwcm_id_private *cm_id_priv = work->cm_id;
1000         unsigned long flags;
1001         int empty;
1002         int ret = 0;
1003         int destroy_id;
1004
1005         spin_lock_irqsave(&cm_id_priv->lock, flags);
1006         empty = list_empty(&cm_id_priv->work_list);
1007         while (!empty) {
1008                 work = list_entry(cm_id_priv->work_list.next,
1009                                   struct iwcm_work, list);
1010                 list_del_init(&work->list);
1011                 empty = list_empty(&cm_id_priv->work_list);
1012                 levent = work->event;
1013                 put_work(work);
1014                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1015
1016                 ret = process_event(cm_id_priv, &levent);
1017                 if (ret) {
1018                         set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
1019                         destroy_cm_id(&cm_id_priv->id);
1020                 }
1021                 BUG_ON(atomic_read(&cm_id_priv->refcount)==0);
1022                 destroy_id = test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
1023                 if (iwcm_deref_id(cm_id_priv)) {
1024                         if (destroy_id) {
1025                                 BUG_ON(!list_empty(&cm_id_priv->work_list));
1026                                 free_cm_id(cm_id_priv);
1027                         }
1028                         return;
1029                 }
1030                 if (empty)
1031                         return;
1032                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1033         }
1034         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1035 }
1036
1037 /*
1038  * This function is called on interrupt context. Schedule events on
1039  * the iwcm_wq thread to allow callback functions to downcall into
1040  * the CM and/or block.  Events are queued to a per-CM_ID
1041  * work_list. If this is the first event on the work_list, the work
1042  * element is also queued on the iwcm_wq thread.
1043  *
1044  * Each event holds a reference on the cm_id. Until the last posted
1045  * event has been delivered and processed, the cm_id cannot be
1046  * deleted.
1047  *
1048  * Returns:
1049  *            0 - the event was handled.
1050  *      -ENOMEM - the event was not handled due to lack of resources.
1051  */
1052 static int cm_event_handler(struct iw_cm_id *cm_id,
1053                              struct iw_cm_event *iw_event)
1054 {
1055         struct iwcm_work *work;
1056         struct iwcm_id_private *cm_id_priv;
1057         unsigned long flags;
1058         int ret = 0;
1059
1060         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1061
1062         spin_lock_irqsave(&cm_id_priv->lock, flags);
1063         work = get_work(cm_id_priv);
1064         if (!work) {
1065                 ret = -ENOMEM;
1066                 goto out;
1067         }
1068
1069         INIT_WORK(&work->work, cm_work_handler);
1070         work->cm_id = cm_id_priv;
1071         work->event = *iw_event;
1072
1073         if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST ||
1074              work->event.event == IW_CM_EVENT_CONNECT_REPLY) &&
1075             work->event.private_data_len) {
1076                 ret = copy_private_data(&work->event);
1077                 if (ret) {
1078                         put_work(work);
1079                         goto out;
1080                 }
1081         }
1082
1083         atomic_inc(&cm_id_priv->refcount);
1084         if (list_empty(&cm_id_priv->work_list)) {
1085                 list_add_tail(&work->list, &cm_id_priv->work_list);
1086                 queue_work(iwcm_wq, &work->work);
1087         } else
1088                 list_add_tail(&work->list, &cm_id_priv->work_list);
1089 out:
1090         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1091         return ret;
1092 }
1093
1094 static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv,
1095                                   struct ib_qp_attr *qp_attr,
1096                                   int *qp_attr_mask)
1097 {
1098         unsigned long flags;
1099         int ret;
1100
1101         spin_lock_irqsave(&cm_id_priv->lock, flags);
1102         switch (cm_id_priv->state) {
1103         case IW_CM_STATE_IDLE:
1104         case IW_CM_STATE_CONN_SENT:
1105         case IW_CM_STATE_CONN_RECV:
1106         case IW_CM_STATE_ESTABLISHED:
1107                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1108                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
1109                                            IB_ACCESS_REMOTE_READ;
1110                 ret = 0;
1111                 break;
1112         default:
1113                 ret = -EINVAL;
1114                 break;
1115         }
1116         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1117         return ret;
1118 }
1119
1120 static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
1121                                   struct ib_qp_attr *qp_attr,
1122                                   int *qp_attr_mask)
1123 {
1124         unsigned long flags;
1125         int ret;
1126
1127         spin_lock_irqsave(&cm_id_priv->lock, flags);
1128         switch (cm_id_priv->state) {
1129         case IW_CM_STATE_IDLE:
1130         case IW_CM_STATE_CONN_SENT:
1131         case IW_CM_STATE_CONN_RECV:
1132         case IW_CM_STATE_ESTABLISHED:
1133                 *qp_attr_mask = 0;
1134                 ret = 0;
1135                 break;
1136         default:
1137                 ret = -EINVAL;
1138                 break;
1139         }
1140         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1141         return ret;
1142 }
1143
1144 int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
1145                        struct ib_qp_attr *qp_attr,
1146                        int *qp_attr_mask)
1147 {
1148         struct iwcm_id_private *cm_id_priv;
1149         int ret;
1150
1151         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1152         switch (qp_attr->qp_state) {
1153         case IB_QPS_INIT:
1154         case IB_QPS_RTR:
1155                 ret = iwcm_init_qp_init_attr(cm_id_priv,
1156                                              qp_attr, qp_attr_mask);
1157                 break;
1158         case IB_QPS_RTS:
1159                 ret = iwcm_init_qp_rts_attr(cm_id_priv,
1160                                             qp_attr, qp_attr_mask);
1161                 break;
1162         default:
1163                 ret = -EINVAL;
1164                 break;
1165         }
1166         return ret;
1167 }
1168 EXPORT_SYMBOL(iw_cm_init_qp_attr);
1169
1170 static int __init iw_cm_init(void)
1171 {
1172         int ret;
1173
1174         ret = iwpm_init(RDMA_NL_IWCM);
1175         if (ret)
1176                 pr_err("iw_cm: couldn't init iwpm\n");
1177
1178         ret = ibnl_add_client(RDMA_NL_IWCM, ARRAY_SIZE(iwcm_nl_cb_table),
1179                               iwcm_nl_cb_table);
1180         if (ret)
1181                 pr_err("iw_cm: couldn't register netlink callbacks\n");
1182
1183         iwcm_wq = create_singlethread_workqueue("iw_cm_wq");
1184         if (!iwcm_wq)
1185                 return -ENOMEM;
1186
1187         iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm",
1188                                                  iwcm_ctl_table);
1189         if (!iwcm_ctl_table_hdr) {
1190                 pr_err("iw_cm: couldn't register sysctl paths\n");
1191                 destroy_workqueue(iwcm_wq);
1192                 return -ENOMEM;
1193         }
1194
1195         return 0;
1196 }
1197
1198 static void __exit iw_cm_cleanup(void)
1199 {
1200         unregister_net_sysctl_table(iwcm_ctl_table_hdr);
1201         destroy_workqueue(iwcm_wq);
1202         ibnl_remove_client(RDMA_NL_IWCM);
1203         iwpm_exit(RDMA_NL_IWCM);
1204 }
1205
1206 module_init(iw_cm_init);
1207 module_exit(iw_cm_cleanup);