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         [RDMA_NL_IWPM_HELLO] = {.dump = iwpm_hello_cb}
  92 };
  93
  94 static struct workqueue_struct *iwcm_wq;
  95 struct iwcm_work {
  96         struct work_struct work;
  97         struct iwcm_id_private *cm_id;
  98         struct list_head list;
  99         struct iw_cm_event event;
 100         struct list_head free_list;
 101 };
 102
 103 static unsigned int default_backlog = 256;
 104
 105 static struct ctl_table_header *iwcm_ctl_table_hdr;
 106 static struct ctl_table iwcm_ctl_table[] = {
 107         {
 108                 .procname       = "default_backlog",
 109                 .data           = &default_backlog,
 110                 .maxlen         = sizeof(default_backlog),
 111                 .mode           = 0644,
 112                 .proc_handler   = proc_dointvec,
 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_first_entry(&cm_id_priv->work_free_list, 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 'true'.
 210  */
 211 static bool iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
 212 {
 213         if (refcount_dec_and_test(&cm_id_priv->refcount)) {
 214                 BUG_ON(!list_empty(&cm_id_priv->work_list));
 215                 free_cm_id(cm_id_priv);
 216                 return true;
 217         }
 218
 219         return false;
 220 }
 221
 222 static void add_ref(struct iw_cm_id *cm_id)
 223 {
 224         struct iwcm_id_private *cm_id_priv;
 225         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 226         refcount_inc(&cm_id_priv->refcount);
 227 }
 228
 229 static void rem_ref(struct iw_cm_id *cm_id)
 230 {
 231         struct iwcm_id_private *cm_id_priv;
 232
 233         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 234
 235         (void)iwcm_deref_id(cm_id_priv);
 236 }
 237
 238 static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event);
 239
 240 struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
 241                                  iw_cm_handler cm_handler,
 242                                  void *context)
 243 {
 244         struct iwcm_id_private *cm_id_priv;
 245
 246         cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL);
 247         if (!cm_id_priv)
 248                 return ERR_PTR(-ENOMEM);
 249
 250         cm_id_priv->state = IW_CM_STATE_IDLE;
 251         cm_id_priv->id.device = device;
 252         cm_id_priv->id.cm_handler = cm_handler;
 253         cm_id_priv->id.context = context;
 254         cm_id_priv->id.event_handler = cm_event_handler;
 255         cm_id_priv->id.add_ref = add_ref;
 256         cm_id_priv->id.rem_ref = rem_ref;
 257         spin_lock_init(&cm_id_priv->lock);
 258         refcount_set(&cm_id_priv->refcount, 1);
 259         init_waitqueue_head(&cm_id_priv->connect_wait);
 260         init_completion(&cm_id_priv->destroy_comp);
 261         INIT_LIST_HEAD(&cm_id_priv->work_list);
 262         INIT_LIST_HEAD(&cm_id_priv->work_free_list);
 263
 264         return &cm_id_priv->id;
 265 }
 266 EXPORT_SYMBOL(iw_create_cm_id);
 267
 268
 269 static int iwcm_modify_qp_err(struct ib_qp *qp)
 270 {
 271         struct ib_qp_attr qp_attr;
 272
 273         if (!qp)
 274                 return -EINVAL;
 275
 276         qp_attr.qp_state = IB_QPS_ERR;
 277         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 278 }
 279
 280 /*
 281  * This is really the RDMAC CLOSING state. It is most similar to the
 282  * IB SQD QP state.
 283  */
 284 static int iwcm_modify_qp_sqd(struct ib_qp *qp)
 285 {
 286         struct ib_qp_attr qp_attr;
 287
 288         BUG_ON(qp == NULL);
 289         qp_attr.qp_state = IB_QPS_SQD;
 290         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 291 }
 292
 293 /*
 294  * CM_ID <-- CLOSING
 295  *
 296  * Block if a passive or active connection is currently being processed. Then
 297  * process the event as follows:
 298  * - If we are ESTABLISHED, move to CLOSING and modify the QP state
 299  *   based on the abrupt flag
 300  * - If the connection is already in the CLOSING or IDLE state, the peer is
 301  *   disconnecting concurrently with us and we've already seen the
 302  *   DISCONNECT event -- ignore the request and return 0
 303  * - Disconnect on a listening endpoint returns -EINVAL
 304  */
 305 int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt)
 306 {
 307         struct iwcm_id_private *cm_id_priv;
 308         unsigned long flags;
 309         int ret = 0;
 310         struct ib_qp *qp = NULL;
 311
 312         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 313         /* Wait if we're currently in a connect or accept downcall */
 314         wait_event(cm_id_priv->connect_wait,
 315                    !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 316
 317         spin_lock_irqsave(&cm_id_priv->lock, flags);
 318         switch (cm_id_priv->state) {
 319         case IW_CM_STATE_ESTABLISHED:
 320                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 321
 322                 /* QP could be <nul> for user-mode client */
 323                 if (cm_id_priv->qp)
 324                         qp = cm_id_priv->qp;
 325                 else
 326                         ret = -EINVAL;
 327                 break;
 328         case IW_CM_STATE_LISTEN:
 329                 ret = -EINVAL;
 330                 break;
 331         case IW_CM_STATE_CLOSING:
 332                 /* remote peer closed first */
 333         case IW_CM_STATE_IDLE:
 334                 /* accept or connect returned !0 */
 335                 break;
 336         case IW_CM_STATE_CONN_RECV:
 337                 /*
 338                  * App called disconnect before/without calling accept after
 339                  * connect_request event delivered.
 340                  */
 341                 break;
 342         case IW_CM_STATE_CONN_SENT:
 343                 /* Can only get here if wait above fails */
 344         default:
 345                 BUG();
 346         }
 347         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 348
 349         if (qp) {
 350                 if (abrupt)
 351                         ret = iwcm_modify_qp_err(qp);
 352                 else
 353                         ret = iwcm_modify_qp_sqd(qp);
 354
 355                 /*
 356                  * If both sides are disconnecting the QP could
 357                  * already be in ERR or SQD states
 358                  */
 359                 ret = 0;
 360         }
 361
 362         return ret;
 363 }
 364 EXPORT_SYMBOL(iw_cm_disconnect);
 365
 366 /*
 367  * CM_ID <-- DESTROYING
 368  *
 369  * Clean up all resources associated with the connection and release
 370  * the initial reference taken by iw_create_cm_id.
 371  *
 372  * Returns true if and only if the last cm_id_priv reference has been dropped.
 373  */
 374 static bool destroy_cm_id(struct iw_cm_id *cm_id)
 375 {
 376         struct iwcm_id_private *cm_id_priv;
 377         struct ib_qp *qp;
 378         unsigned long flags;
 379
 380         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 381         /*
 382          * Wait if we're currently in a connect or accept downcall. A
 383          * listening endpoint should never block here.
 384          */
 385         wait_event(cm_id_priv->connect_wait,
 386                    !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 387
 388         /*
 389          * Since we're deleting the cm_id, drop any events that
 390          * might arrive before the last dereference.
 391          */
 392         set_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags);
 393
 394         spin_lock_irqsave(&cm_id_priv->lock, flags);
 395         qp = cm_id_priv->qp;
 396         cm_id_priv->qp = NULL;
 397
 398         switch (cm_id_priv->state) {
 399         case IW_CM_STATE_LISTEN:
 400                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 401                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 402                 /* destroy the listening endpoint */
 403                 cm_id->device->ops.iw_destroy_listen(cm_id);
 404                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 405                 break;
 406         case IW_CM_STATE_ESTABLISHED:
 407                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 408                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 409                 /* Abrupt close of the connection */
 410                 (void)iwcm_modify_qp_err(qp);
 411                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 412                 break;
 413         case IW_CM_STATE_IDLE:
 414         case IW_CM_STATE_CLOSING:
 415                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 416                 break;
 417         case IW_CM_STATE_CONN_RECV:
 418                 /*
 419                  * App called destroy before/without calling accept after
 420                  * receiving connection request event notification or
 421                  * returned non zero from the event callback function.
 422                  * In either case, must tell the provider to reject.
 423                  */
 424                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 425                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 426                 cm_id->device->ops.iw_reject(cm_id, NULL, 0);
 427                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 428                 break;
 429         case IW_CM_STATE_CONN_SENT:
 430         case IW_CM_STATE_DESTROYING:
 431         default:
 432                 BUG();
 433                 break;
 434         }
 435         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 436         if (qp)
 437                 cm_id_priv->id.device->ops.iw_rem_ref(qp);
 438
 439         if (cm_id->mapped) {
 440                 iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr);
 441                 iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM);
 442         }
 443
 444         return iwcm_deref_id(cm_id_priv);
 445 }
 446
 447 /*
 448  * This function is only called by the application thread and cannot
 449  * be called by the event thread. The function will wait for all
 450  * references to be released on the cm_id and then kfree the cm_id
 451  * object.
 452  */
 453 void iw_destroy_cm_id(struct iw_cm_id *cm_id)
 454 {
 455         if (!destroy_cm_id(cm_id))
 456                 flush_workqueue(iwcm_wq);
 457 }
 458 EXPORT_SYMBOL(iw_destroy_cm_id);
 459
 460 /**
 461  * iw_cm_check_wildcard - If IP address is 0 then use original
 462  * @pm_addr: sockaddr containing the ip to check for wildcard
 463  * @cm_addr: sockaddr containing the actual IP address
 464  * @cm_outaddr: sockaddr to set IP addr which leaving port
 465  *
 466  *  Checks the pm_addr for wildcard and then sets cm_outaddr's
 467  *  IP to the actual (cm_addr).
 468  */
 469 static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr,
 470                                  struct sockaddr_storage *cm_addr,
 471                                  struct sockaddr_storage *cm_outaddr)
 472 {
 473         if (pm_addr->ss_family == AF_INET) {
 474                 struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr;
 475
 476                 if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) {
 477                         struct sockaddr_in *cm4_addr =
 478                                 (struct sockaddr_in *)cm_addr;
 479                         struct sockaddr_in *cm4_outaddr =
 480                                 (struct sockaddr_in *)cm_outaddr;
 481
 482                         cm4_outaddr->sin_addr = cm4_addr->sin_addr;
 483                 }
 484         } else {
 485                 struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr;
 486
 487                 if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) {
 488                         struct sockaddr_in6 *cm6_addr =
 489                                 (struct sockaddr_in6 *)cm_addr;
 490                         struct sockaddr_in6 *cm6_outaddr =
 491                                 (struct sockaddr_in6 *)cm_outaddr;
 492
 493                         cm6_outaddr->sin6_addr = cm6_addr->sin6_addr;
 494                 }
 495         }
 496 }
 497
 498 /**
 499  * iw_cm_map - Use portmapper to map the ports
 500  * @cm_id: connection manager pointer
 501  * @active: Indicates the active side when true
 502  * returns nonzero for error only if iwpm_create_mapinfo() fails
 503  *
 504  * Tries to add a mapping for a port using the Portmapper. If
 505  * successful in mapping the IP/Port it will check the remote
 506  * mapped IP address for a wildcard IP address and replace the
 507  * zero IP address with the remote_addr.
 508  */
 509 static int iw_cm_map(struct iw_cm_id *cm_id, bool active)
 510 {
 511         const char *devname = dev_name(&cm_id->device->dev);
 512         const char *ifname = cm_id->device->iw_ifname;
 513         struct iwpm_dev_data pm_reg_msg = {};
 514         struct iwpm_sa_data pm_msg;
 515         int status;
 516
 517         if (strlen(devname) >= sizeof(pm_reg_msg.dev_name) ||
 518             strlen(ifname) >= sizeof(pm_reg_msg.if_name))
 519                 return -EINVAL;
 520
 521         cm_id->m_local_addr = cm_id->local_addr;
 522         cm_id->m_remote_addr = cm_id->remote_addr;
 523
 524         strcpy(pm_reg_msg.dev_name, devname);
 525         strcpy(pm_reg_msg.if_name, ifname);
 526
 527         if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) ||
 528             !iwpm_valid_pid())
 529                 return 0;
 530
 531         cm_id->mapped = true;
 532         pm_msg.loc_addr = cm_id->local_addr;
 533         pm_msg.rem_addr = cm_id->remote_addr;
 534         pm_msg.flags = (cm_id->device->iw_driver_flags & IW_F_NO_PORT_MAP) ?
 535                        IWPM_FLAGS_NO_PORT_MAP : 0;
 536         if (active)
 537                 status = iwpm_add_and_query_mapping(&pm_msg,
 538                                                     RDMA_NL_IWCM);
 539         else
 540                 status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM);
 541
 542         if (!status) {
 543                 cm_id->m_local_addr = pm_msg.mapped_loc_addr;
 544                 if (active) {
 545                         cm_id->m_remote_addr = pm_msg.mapped_rem_addr;
 546                         iw_cm_check_wildcard(&pm_msg.mapped_rem_addr,
 547                                              &cm_id->remote_addr,
 548                                              &cm_id->m_remote_addr);
 549                 }
 550         }
 551
 552         return iwpm_create_mapinfo(&cm_id->local_addr,
 553                                    &cm_id->m_local_addr,
 554                                    RDMA_NL_IWCM, pm_msg.flags);
 555 }
 556
 557 /*
 558  * CM_ID <-- LISTEN
 559  *
 560  * Start listening for connect requests. Generates one CONNECT_REQUEST
 561  * event for each inbound connect request.
 562  */
 563 int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
 564 {
 565         struct iwcm_id_private *cm_id_priv;
 566         unsigned long flags;
 567         int ret;
 568
 569         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 570
 571         if (!backlog)
 572                 backlog = default_backlog;
 573
 574         ret = alloc_work_entries(cm_id_priv, backlog);
 575         if (ret)
 576                 return ret;
 577
 578         spin_lock_irqsave(&cm_id_priv->lock, flags);
 579         switch (cm_id_priv->state) {
 580         case IW_CM_STATE_IDLE:
 581                 cm_id_priv->state = IW_CM_STATE_LISTEN;
 582                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 583                 ret = iw_cm_map(cm_id, false);
 584                 if (!ret)
 585                         ret = cm_id->device->ops.iw_create_listen(cm_id,
 586                                                                   backlog);
 587                 if (ret)
 588                         cm_id_priv->state = IW_CM_STATE_IDLE;
 589                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 590                 break;
 591         default:
 592                 ret = -EINVAL;
 593         }
 594         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 595
 596         return ret;
 597 }
 598 EXPORT_SYMBOL(iw_cm_listen);
 599
 600 /*
 601  * CM_ID <-- IDLE
 602  *
 603  * Rejects an inbound connection request. No events are generated.
 604  */
 605 int iw_cm_reject(struct iw_cm_id *cm_id,
 606                  const void *private_data,
 607                  u8 private_data_len)
 608 {
 609         struct iwcm_id_private *cm_id_priv;
 610         unsigned long flags;
 611         int ret;
 612
 613         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 614         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 615
 616         spin_lock_irqsave(&cm_id_priv->lock, flags);
 617         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 618                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 619                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 620                 wake_up_all(&cm_id_priv->connect_wait);
 621                 return -EINVAL;
 622         }
 623         cm_id_priv->state = IW_CM_STATE_IDLE;
 624         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 625
 626         ret = cm_id->device->ops.iw_reject(cm_id, private_data,
 627                                           private_data_len);
 628
 629         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 630         wake_up_all(&cm_id_priv->connect_wait);
 631
 632         return ret;
 633 }
 634 EXPORT_SYMBOL(iw_cm_reject);
 635
 636 /*
 637  * CM_ID <-- ESTABLISHED
 638  *
 639  * Accepts an inbound connection request and generates an ESTABLISHED
 640  * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
 641  * until the ESTABLISHED event is received from the provider.
 642  */
 643 int iw_cm_accept(struct iw_cm_id *cm_id,
 644                  struct iw_cm_conn_param *iw_param)
 645 {
 646         struct iwcm_id_private *cm_id_priv;
 647         struct ib_qp *qp;
 648         unsigned long flags;
 649         int ret;
 650
 651         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 652         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 653
 654         spin_lock_irqsave(&cm_id_priv->lock, flags);
 655         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 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         /* Get the ib_qp given the QPN */
 662         qp = cm_id->device->ops.iw_get_qp(cm_id->device, iw_param->qpn);
 663         if (!qp) {
 664                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 665                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 666                 wake_up_all(&cm_id_priv->connect_wait);
 667                 return -EINVAL;
 668         }
 669         cm_id->device->ops.iw_add_ref(qp);
 670         cm_id_priv->qp = qp;
 671         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 672
 673         ret = cm_id->device->ops.iw_accept(cm_id, iw_param);
 674         if (ret) {
 675                 /* An error on accept precludes provider events */
 676                 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 677                 cm_id_priv->state = IW_CM_STATE_IDLE;
 678                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 679                 qp = cm_id_priv->qp;
 680                 cm_id_priv->qp = NULL;
 681                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 682                 if (qp)
 683                         cm_id->device->ops.iw_rem_ref(qp);
 684                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 685                 wake_up_all(&cm_id_priv->connect_wait);
 686         }
 687
 688         return ret;
 689 }
 690 EXPORT_SYMBOL(iw_cm_accept);
 691
 692 /*
 693  * Active Side: CM_ID <-- CONN_SENT
 694  *
 695  * If successful, results in the generation of a CONNECT_REPLY
 696  * event. iw_cm_disconnect and iw_cm_destroy will block until the
 697  * CONNECT_REPLY event is received from the provider.
 698  */
 699 int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param)
 700 {
 701         struct iwcm_id_private *cm_id_priv;
 702         int ret;
 703         unsigned long flags;
 704         struct ib_qp *qp = NULL;
 705
 706         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 707
 708         ret = alloc_work_entries(cm_id_priv, 4);
 709         if (ret)
 710                 return ret;
 711
 712         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 713         spin_lock_irqsave(&cm_id_priv->lock, flags);
 714
 715         if (cm_id_priv->state != IW_CM_STATE_IDLE) {
 716                 ret = -EINVAL;
 717                 goto err;
 718         }
 719
 720         /* Get the ib_qp given the QPN */
 721         qp = cm_id->device->ops.iw_get_qp(cm_id->device, iw_param->qpn);
 722         if (!qp) {
 723                 ret = -EINVAL;
 724                 goto err;
 725         }
 726         cm_id->device->ops.iw_add_ref(qp);
 727         cm_id_priv->qp = qp;
 728         cm_id_priv->state = IW_CM_STATE_CONN_SENT;
 729         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 730
 731         ret = iw_cm_map(cm_id, true);
 732         if (!ret)
 733                 ret = cm_id->device->ops.iw_connect(cm_id, iw_param);
 734         if (!ret)
 735                 return 0;       /* success */
 736
 737         spin_lock_irqsave(&cm_id_priv->lock, flags);
 738         qp = cm_id_priv->qp;
 739         cm_id_priv->qp = NULL;
 740         cm_id_priv->state = IW_CM_STATE_IDLE;
 741 err:
 742         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 743         if (qp)
 744                 cm_id->device->ops.iw_rem_ref(qp);
 745         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 746         wake_up_all(&cm_id_priv->connect_wait);
 747         return ret;
 748 }
 749 EXPORT_SYMBOL(iw_cm_connect);
 750
 751 /*
 752  * Passive Side: new CM_ID <-- CONN_RECV
 753  *
 754  * Handles an inbound connect request. The function creates a new
 755  * iw_cm_id to represent the new connection and inherits the client
 756  * callback function and other attributes from the listening parent.
 757  *
 758  * The work item contains a pointer to the listen_cm_id and the event. The
 759  * listen_cm_id contains the client cm_handler, context and
 760  * device. These are copied when the device is cloned. The event
 761  * contains the new four tuple.
 762  *
 763  * An error on the child should not affect the parent, so this
 764  * function does not return a value.
 765  */
 766 static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv,
 767                                 struct iw_cm_event *iw_event)
 768 {
 769         unsigned long flags;
 770         struct iw_cm_id *cm_id;
 771         struct iwcm_id_private *cm_id_priv;
 772         int ret;
 773
 774         /*
 775          * The provider should never generate a connection request
 776          * event with a bad status.
 777          */
 778         BUG_ON(iw_event->status);
 779
 780         cm_id = iw_create_cm_id(listen_id_priv->id.device,
 781                                 listen_id_priv->id.cm_handler,
 782                                 listen_id_priv->id.context);
 783         /* If the cm_id could not be created, ignore the request */
 784         if (IS_ERR(cm_id))
 785                 goto out;
 786
 787         cm_id->provider_data = iw_event->provider_data;
 788         cm_id->m_local_addr = iw_event->local_addr;
 789         cm_id->m_remote_addr = iw_event->remote_addr;
 790         cm_id->local_addr = listen_id_priv->id.local_addr;
 791
 792         ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr,
 793                                    &iw_event->remote_addr,
 794                                    &cm_id->remote_addr,
 795                                    RDMA_NL_IWCM);
 796         if (ret) {
 797                 cm_id->remote_addr = iw_event->remote_addr;
 798         } else {
 799                 iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr,
 800                                      &iw_event->local_addr,
 801                                      &cm_id->local_addr);
 802                 iw_event->local_addr = cm_id->local_addr;
 803                 iw_event->remote_addr = cm_id->remote_addr;
 804         }
 805
 806         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 807         cm_id_priv->state = IW_CM_STATE_CONN_RECV;
 808
 809         /*
 810          * We could be destroying the listening id. If so, ignore this
 811          * upcall.
 812          */
 813         spin_lock_irqsave(&listen_id_priv->lock, flags);
 814         if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
 815                 spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 816                 iw_cm_reject(cm_id, NULL, 0);
 817                 iw_destroy_cm_id(cm_id);
 818                 goto out;
 819         }
 820         spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 821
 822         ret = alloc_work_entries(cm_id_priv, 3);
 823         if (ret) {
 824                 iw_cm_reject(cm_id, NULL, 0);
 825                 iw_destroy_cm_id(cm_id);
 826                 goto out;
 827         }
 828
 829         /* Call the client CM handler */
 830         ret = cm_id->cm_handler(cm_id, iw_event);
 831         if (ret) {
 832                 iw_cm_reject(cm_id, NULL, 0);
 833                 iw_destroy_cm_id(cm_id);
 834         }
 835
 836 out:
 837         if (iw_event->private_data_len)
 838                 kfree(iw_event->private_data);
 839 }
 840
 841 /*
 842  * Passive Side: CM_ID <-- ESTABLISHED
 843  *
 844  * The provider generated an ESTABLISHED event which means that
 845  * the MPA negotion has completed successfully and we are now in MPA
 846  * FPDU mode.
 847  *
 848  * This event can only be received in the CONN_RECV state. If the
 849  * remote peer closed, the ESTABLISHED event would be received followed
 850  * by the CLOSE event. If the app closes, it will block until we wake
 851  * it up after processing this event.
 852  */
 853 static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv,
 854                                struct iw_cm_event *iw_event)
 855 {
 856         unsigned long flags;
 857         int ret;
 858
 859         spin_lock_irqsave(&cm_id_priv->lock, flags);
 860
 861         /*
 862          * We clear the CONNECT_WAIT bit here to allow the callback
 863          * function to call iw_cm_disconnect. Calling iw_destroy_cm_id
 864          * from a callback handler is not allowed.
 865          */
 866         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 867         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 868         cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 869         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 870         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 871         wake_up_all(&cm_id_priv->connect_wait);
 872
 873         return ret;
 874 }
 875
 876 /*
 877  * Active Side: CM_ID <-- ESTABLISHED
 878  *
 879  * The app has called connect and is waiting for the established event to
 880  * post it's requests to the server. This event will wake up anyone
 881  * blocked in iw_cm_disconnect or iw_destroy_id.
 882  */
 883 static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv,
 884                                struct iw_cm_event *iw_event)
 885 {
 886         struct ib_qp *qp = NULL;
 887         unsigned long flags;
 888         int ret;
 889
 890         spin_lock_irqsave(&cm_id_priv->lock, flags);
 891         /*
 892          * Clear the connect wait bit so a callback function calling
 893          * iw_cm_disconnect will not wait and deadlock this thread
 894          */
 895         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 896         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
 897         if (iw_event->status == 0) {
 898                 cm_id_priv->id.m_local_addr = iw_event->local_addr;
 899                 cm_id_priv->id.m_remote_addr = iw_event->remote_addr;
 900                 iw_event->local_addr = cm_id_priv->id.local_addr;
 901                 iw_event->remote_addr = cm_id_priv->id.remote_addr;
 902                 cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 903         } else {
 904                 /* REJECTED or RESET */
 905                 qp = cm_id_priv->qp;
 906                 cm_id_priv->qp = NULL;
 907                 cm_id_priv->state = IW_CM_STATE_IDLE;
 908         }
 909         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 910         if (qp)
 911                 cm_id_priv->id.device->ops.iw_rem_ref(qp);
 912         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 913
 914         if (iw_event->private_data_len)
 915                 kfree(iw_event->private_data);
 916
 917         /* Wake up waiters on connect complete */
 918         wake_up_all(&cm_id_priv->connect_wait);
 919
 920         return ret;
 921 }
 922
 923 /*
 924  * CM_ID <-- CLOSING
 925  *
 926  * If in the ESTABLISHED state, move to CLOSING.
 927  */
 928 static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv,
 929                                   struct iw_cm_event *iw_event)
 930 {
 931         unsigned long flags;
 932
 933         spin_lock_irqsave(&cm_id_priv->lock, flags);
 934         if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
 935                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 936         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 937 }
 938
 939 /*
 940  * CM_ID <-- IDLE
 941  *
 942  * If in the ESTBLISHED or CLOSING states, the QP will have have been
 943  * moved by the provider to the ERR state. Disassociate the CM_ID from
 944  * the QP,  move to IDLE, and remove the 'connected' reference.
 945  *
 946  * If in some other state, the cm_id was destroyed asynchronously.
 947  * This is the last reference that will result in waking up
 948  * the app thread blocked in iw_destroy_cm_id.
 949  */
 950 static int cm_close_handler(struct iwcm_id_private *cm_id_priv,
 951                                   struct iw_cm_event *iw_event)
 952 {
 953         struct ib_qp *qp;
 954         unsigned long flags;
 955         int ret = 0, notify_event = 0;
 956         spin_lock_irqsave(&cm_id_priv->lock, flags);
 957         qp = cm_id_priv->qp;
 958         cm_id_priv->qp = NULL;
 959
 960         switch (cm_id_priv->state) {
 961         case IW_CM_STATE_ESTABLISHED:
 962         case IW_CM_STATE_CLOSING:
 963                 cm_id_priv->state = IW_CM_STATE_IDLE;
 964                 notify_event = 1;
 965                 break;
 966         case IW_CM_STATE_DESTROYING:
 967                 break;
 968         default:
 969                 BUG();
 970         }
 971         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 972
 973         if (qp)
 974                 cm_id_priv->id.device->ops.iw_rem_ref(qp);
 975         if (notify_event)
 976                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 977         return ret;
 978 }
 979
 980 static int process_event(struct iwcm_id_private *cm_id_priv,
 981                          struct iw_cm_event *iw_event)
 982 {
 983         int ret = 0;
 984
 985         switch (iw_event->event) {
 986         case IW_CM_EVENT_CONNECT_REQUEST:
 987                 cm_conn_req_handler(cm_id_priv, iw_event);
 988                 break;
 989         case IW_CM_EVENT_CONNECT_REPLY:
 990                 ret = cm_conn_rep_handler(cm_id_priv, iw_event);
 991                 break;
 992         case IW_CM_EVENT_ESTABLISHED:
 993                 ret = cm_conn_est_handler(cm_id_priv, iw_event);
 994                 break;
 995         case IW_CM_EVENT_DISCONNECT:
 996                 cm_disconnect_handler(cm_id_priv, iw_event);
 997                 break;
 998         case IW_CM_EVENT_CLOSE:
 999                 ret = cm_close_handler(cm_id_priv, iw_event);
1000                 break;
1001         default:
1002                 BUG();
1003         }
1004
1005         return ret;
1006 }
1007
1008 /*
1009  * Process events on the work_list for the cm_id. If the callback
1010  * function requests that the cm_id be deleted, a flag is set in the
1011  * cm_id flags to indicate that when the last reference is
1012  * removed, the cm_id is to be destroyed. This is necessary to
1013  * distinguish between an object that will be destroyed by the app
1014  * thread asleep on the destroy_comp list vs. an object destroyed
1015  * here synchronously when the last reference is removed.
1016  */
1017 static void cm_work_handler(struct work_struct *_work)
1018 {
1019         struct iwcm_work *work = container_of(_work, struct iwcm_work, work);
1020         struct iw_cm_event levent;
1021         struct iwcm_id_private *cm_id_priv = work->cm_id;
1022         unsigned long flags;
1023         int ret = 0;
1024
1025         spin_lock_irqsave(&cm_id_priv->lock, flags);
1026         while (!list_empty(&cm_id_priv->work_list)) {
1027                 work = list_first_entry(&cm_id_priv->work_list,
1028                                         struct iwcm_work, list);
1029                 list_del_init(&work->list);
1030                 levent = work->event;
1031                 put_work(work);
1032                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1033
1034                 if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) {
1035                         ret = process_event(cm_id_priv, &levent);
1036                         if (ret)
1037                                 WARN_ON_ONCE(destroy_cm_id(&cm_id_priv->id));
1038                 } else
1039                         pr_debug("dropping event %d\n", levent.event);
1040                 if (iwcm_deref_id(cm_id_priv))
1041                         return;
1042                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1043         }
1044         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1045 }
1046
1047 /*
1048  * This function is called on interrupt context. Schedule events on
1049  * the iwcm_wq thread to allow callback functions to downcall into
1050  * the CM and/or block.  Events are queued to a per-CM_ID
1051  * work_list. If this is the first event on the work_list, the work
1052  * element is also queued on the iwcm_wq thread.
1053  *
1054  * Each event holds a reference on the cm_id. Until the last posted
1055  * event has been delivered and processed, the cm_id cannot be
1056  * deleted.
1057  *
1058  * Returns:
1059  *            0 - the event was handled.
1060  *      -ENOMEM - the event was not handled due to lack of resources.
1061  */
1062 static int cm_event_handler(struct iw_cm_id *cm_id,
1063                              struct iw_cm_event *iw_event)
1064 {
1065         struct iwcm_work *work;
1066         struct iwcm_id_private *cm_id_priv;
1067         unsigned long flags;
1068         int ret = 0;
1069
1070         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1071
1072         spin_lock_irqsave(&cm_id_priv->lock, flags);
1073         work = get_work(cm_id_priv);
1074         if (!work) {
1075                 ret = -ENOMEM;
1076                 goto out;
1077         }
1078
1079         INIT_WORK(&work->work, cm_work_handler);
1080         work->cm_id = cm_id_priv;
1081         work->event = *iw_event;
1082
1083         if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST ||
1084              work->event.event == IW_CM_EVENT_CONNECT_REPLY) &&
1085             work->event.private_data_len) {
1086                 ret = copy_private_data(&work->event);
1087                 if (ret) {
1088                         put_work(work);
1089                         goto out;
1090                 }
1091         }
1092
1093         refcount_inc(&cm_id_priv->refcount);
1094         list_add_tail(&work->list, &cm_id_priv->work_list);
1095         queue_work(iwcm_wq, &work->work);
1096 out:
1097         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1098         return ret;
1099 }
1100
1101 static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv,
1102                                   struct ib_qp_attr *qp_attr,
1103                                   int *qp_attr_mask)
1104 {
1105         unsigned long flags;
1106         int ret;
1107
1108         spin_lock_irqsave(&cm_id_priv->lock, flags);
1109         switch (cm_id_priv->state) {
1110         case IW_CM_STATE_IDLE:
1111         case IW_CM_STATE_CONN_SENT:
1112         case IW_CM_STATE_CONN_RECV:
1113         case IW_CM_STATE_ESTABLISHED:
1114                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1115                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
1116                                            IB_ACCESS_REMOTE_READ;
1117                 ret = 0;
1118                 break;
1119         default:
1120                 ret = -EINVAL;
1121                 break;
1122         }
1123         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1124         return ret;
1125 }
1126
1127 static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
1128                                   struct ib_qp_attr *qp_attr,
1129                                   int *qp_attr_mask)
1130 {
1131         unsigned long flags;
1132         int ret;
1133
1134         spin_lock_irqsave(&cm_id_priv->lock, flags);
1135         switch (cm_id_priv->state) {
1136         case IW_CM_STATE_IDLE:
1137         case IW_CM_STATE_CONN_SENT:
1138         case IW_CM_STATE_CONN_RECV:
1139         case IW_CM_STATE_ESTABLISHED:
1140                 *qp_attr_mask = 0;
1141                 ret = 0;
1142                 break;
1143         default:
1144                 ret = -EINVAL;
1145                 break;
1146         }
1147         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1148         return ret;
1149 }
1150
1151 int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
1152                        struct ib_qp_attr *qp_attr,
1153                        int *qp_attr_mask)
1154 {
1155         struct iwcm_id_private *cm_id_priv;
1156         int ret;
1157
1158         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1159         switch (qp_attr->qp_state) {
1160         case IB_QPS_INIT:
1161         case IB_QPS_RTR:
1162                 ret = iwcm_init_qp_init_attr(cm_id_priv,
1163                                              qp_attr, qp_attr_mask);
1164                 break;
1165         case IB_QPS_RTS:
1166                 ret = iwcm_init_qp_rts_attr(cm_id_priv,
1167                                             qp_attr, qp_attr_mask);
1168                 break;
1169         default:
1170                 ret = -EINVAL;
1171                 break;
1172         }
1173         return ret;
1174 }
1175 EXPORT_SYMBOL(iw_cm_init_qp_attr);
1176
1177 static int __init iw_cm_init(void)
1178 {
1179         int ret;
1180
1181         ret = iwpm_init(RDMA_NL_IWCM);
1182         if (ret)
1183                 return ret;
1184
1185         iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", WQ_MEM_RECLAIM);
1186         if (!iwcm_wq)
1187                 goto err_alloc;
1188
1189         iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm",
1190                                                  iwcm_ctl_table);
1191         if (!iwcm_ctl_table_hdr) {
1192                 pr_err("iw_cm: couldn't register sysctl paths\n");
1193                 goto err_sysctl;
1194         }
1195
1196         rdma_nl_register(RDMA_NL_IWCM, iwcm_nl_cb_table);
1197         return 0;
1198
1199 err_sysctl:
1200         destroy_workqueue(iwcm_wq);
1201 err_alloc:
1202         iwpm_exit(RDMA_NL_IWCM);
1203         return -ENOMEM;
1204 }
1205
1206 static void __exit iw_cm_cleanup(void)
1207 {
1208         rdma_nl_unregister(RDMA_NL_IWCM);
1209         unregister_net_sysctl_table(iwcm_ctl_table_hdr);
1210         destroy_workqueue(iwcm_wq);
1211         iwpm_exit(RDMA_NL_IWCM);
1212 }
1213
1214 MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2);
1215
1216 module_init(iw_cm_init);
1217 module_exit(iw_cm_cleanup);