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 /*
 118  * The following services provide a mechanism for pre-allocating iwcm_work
 119  * elements.  The design pre-allocates them  based on the cm_id type:
 120  *      LISTENING IDS:  Get enough elements preallocated to handle the
 121  *                      listen backlog.
 122  *      ACTIVE IDS:     4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE
 123  *      PASSIVE IDS:    3: ESTABLISHED, DISCONNECT, CLOSE
 124  *
 125  * Allocating them in connect and listen avoids having to deal
 126  * with allocation failures on the event upcall from the provider (which
 127  * is called in the interrupt context).
 128  *
 129  * One exception is when creating the cm_id for incoming connection requests.
 130  * There are two cases:
 131  * 1) in the event upcall, cm_event_handler(), for a listening cm_id.  If
 132  *    the backlog is exceeded, then no more connection request events will
 133  *    be processed.  cm_event_handler() returns -ENOMEM in this case.  Its up
 134  *    to the provider to reject the connection request.
 135  * 2) in the connection request workqueue handler, cm_conn_req_handler().
 136  *    If work elements cannot be allocated for the new connect request cm_id,
 137  *    then IWCM will call the provider reject method.  This is ok since
 138  *    cm_conn_req_handler() runs in the workqueue thread context.
 139  */
 140
 141 static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv)
 142 {
 143         struct iwcm_work *work;
 144
 145         if (list_empty(&cm_id_priv->work_free_list))
 146                 return NULL;
 147         work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work,
 148                           free_list);
 149         list_del_init(&work->free_list);
 150         return work;
 151 }
 152
 153 static void put_work(struct iwcm_work *work)
 154 {
 155         list_add(&work->free_list, &work->cm_id->work_free_list);
 156 }
 157
 158 static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv)
 159 {
 160         struct list_head *e, *tmp;
 161
 162         list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) {
 163                 list_del(e);
 164                 kfree(list_entry(e, struct iwcm_work, free_list));
 165         }
 166 }
 167
 168 static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count)
 169 {
 170         struct iwcm_work *work;
 171
 172         BUG_ON(!list_empty(&cm_id_priv->work_free_list));
 173         while (count--) {
 174                 work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL);
 175                 if (!work) {
 176                         dealloc_work_entries(cm_id_priv);
 177                         return -ENOMEM;
 178                 }
 179                 work->cm_id = cm_id_priv;
 180                 INIT_LIST_HEAD(&work->list);
 181                 put_work(work);
 182         }
 183         return 0;
 184 }
 185
 186 /*
 187  * Save private data from incoming connection requests to
 188  * iw_cm_event, so the low level driver doesn't have to. Adjust
 189  * the event ptr to point to the local copy.
 190  */
 191 static int copy_private_data(struct iw_cm_event *event)
 192 {
 193         void *p;
 194
 195         p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC);
 196         if (!p)
 197                 return -ENOMEM;
 198         event->private_data = p;
 199         return 0;
 200 }
 201
 202 static void free_cm_id(struct iwcm_id_private *cm_id_priv)
 203 {
 204         dealloc_work_entries(cm_id_priv);
 205         kfree(cm_id_priv);
 206 }
 207
 208 /*
 209  * Release a reference on cm_id. If the last reference is being
 210  * released, free the cm_id and return 1.
 211  */
 212 static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
 213 {
 214         if (refcount_dec_and_test(&cm_id_priv->refcount)) {
 215                 BUG_ON(!list_empty(&cm_id_priv->work_list));
 216                 free_cm_id(cm_id_priv);
 217                 return 1;
 218         }
 219
 220         return 0;
 221 }
 222
 223 static void add_ref(struct iw_cm_id *cm_id)
 224 {
 225         struct iwcm_id_private *cm_id_priv;
 226         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 227         refcount_inc(&cm_id_priv->refcount);
 228 }
 229
 230 static void rem_ref(struct iw_cm_id *cm_id)
 231 {
 232         struct iwcm_id_private *cm_id_priv;
 233
 234         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 235
 236         (void)iwcm_deref_id(cm_id_priv);
 237 }
 238
 239 static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event);
 240
 241 struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
 242                                  iw_cm_handler cm_handler,
 243                                  void *context)
 244 {
 245         struct iwcm_id_private *cm_id_priv;
 246
 247         cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL);
 248         if (!cm_id_priv)
 249                 return ERR_PTR(-ENOMEM);
 250
 251         cm_id_priv->state = IW_CM_STATE_IDLE;
 252         cm_id_priv->id.device = device;
 253         cm_id_priv->id.cm_handler = cm_handler;
 254         cm_id_priv->id.context = context;
 255         cm_id_priv->id.event_handler = cm_event_handler;
 256         cm_id_priv->id.add_ref = add_ref;
 257         cm_id_priv->id.rem_ref = rem_ref;
 258         spin_lock_init(&cm_id_priv->lock);
 259         refcount_set(&cm_id_priv->refcount, 1);
 260         init_waitqueue_head(&cm_id_priv->connect_wait);
 261         init_completion(&cm_id_priv->destroy_comp);
 262         INIT_LIST_HEAD(&cm_id_priv->work_list);
 263         INIT_LIST_HEAD(&cm_id_priv->work_free_list);
 264
 265         return &cm_id_priv->id;
 266 }
 267 EXPORT_SYMBOL(iw_create_cm_id);
 268
 269
 270 static int iwcm_modify_qp_err(struct ib_qp *qp)
 271 {
 272         struct ib_qp_attr qp_attr;
 273
 274         if (!qp)
 275                 return -EINVAL;
 276
 277         qp_attr.qp_state = IB_QPS_ERR;
 278         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 279 }
 280
 281 /*
 282  * This is really the RDMAC CLOSING state. It is most similar to the
 283  * IB SQD QP state.
 284  */
 285 static int iwcm_modify_qp_sqd(struct ib_qp *qp)
 286 {
 287         struct ib_qp_attr qp_attr;
 288
 289         BUG_ON(qp == NULL);
 290         qp_attr.qp_state = IB_QPS_SQD;
 291         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 292 }
 293
 294 /*
 295  * CM_ID <-- CLOSING
 296  *
 297  * Block if a passive or active connection is currently being processed. Then
 298  * process the event as follows:
 299  * - If we are ESTABLISHED, move to CLOSING and modify the QP state
 300  *   based on the abrupt flag
 301  * - If the connection is already in the CLOSING or IDLE state, the peer is
 302  *   disconnecting concurrently with us and we've already seen the
 303  *   DISCONNECT event -- ignore the request and return 0
 304  * - Disconnect on a listening endpoint returns -EINVAL
 305  */
 306 int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt)
 307 {
 308         struct iwcm_id_private *cm_id_priv;
 309         unsigned long flags;
 310         int ret = 0;
 311         struct ib_qp *qp = NULL;
 312
 313         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 314         /* Wait if we're currently in a connect or accept downcall */
 315         wait_event(cm_id_priv->connect_wait,
 316                    !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 317
 318         spin_lock_irqsave(&cm_id_priv->lock, flags);
 319         switch (cm_id_priv->state) {
 320         case IW_CM_STATE_ESTABLISHED:
 321                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 322
 323                 /* QP could be <nul> for user-mode client */
 324                 if (cm_id_priv->qp)
 325                         qp = cm_id_priv->qp;
 326                 else
 327                         ret = -EINVAL;
 328                 break;
 329         case IW_CM_STATE_LISTEN:
 330                 ret = -EINVAL;
 331                 break;
 332         case IW_CM_STATE_CLOSING:
 333                 /* remote peer closed first */
 334         case IW_CM_STATE_IDLE:
 335                 /* accept or connect returned !0 */
 336                 break;
 337         case IW_CM_STATE_CONN_RECV:
 338                 /*
 339                  * App called disconnect before/without calling accept after
 340                  * connect_request event delivered.
 341                  */
 342                 break;
 343         case IW_CM_STATE_CONN_SENT:
 344                 /* Can only get here if wait above fails */
 345         default:
 346                 BUG();
 347         }
 348         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 349
 350         if (qp) {
 351                 if (abrupt)
 352                         ret = iwcm_modify_qp_err(qp);
 353                 else
 354                         ret = iwcm_modify_qp_sqd(qp);
 355
 356                 /*
 357                  * If both sides are disconnecting the QP could
 358                  * already be in ERR or SQD states
 359                  */
 360                 ret = 0;
 361         }
 362
 363         return ret;
 364 }
 365 EXPORT_SYMBOL(iw_cm_disconnect);
 366
 367 /*
 368  * CM_ID <-- DESTROYING
 369  *
 370  * Clean up all resources associated with the connection and release
 371  * the initial reference taken by iw_create_cm_id.
 372  */
 373 static void destroy_cm_id(struct iw_cm_id *cm_id)
 374 {
 375         struct iwcm_id_private *cm_id_priv;
 376         struct ib_qp *qp;
 377         unsigned long flags;
 378
 379         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 380         /*
 381          * Wait if we're currently in a connect or accept downcall. A
 382          * listening endpoint should never block here.
 383          */
 384         wait_event(cm_id_priv->connect_wait,
 385                    !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 386
 387         /*
 388          * Since we're deleting the cm_id, drop any events that
 389          * might arrive before the last dereference.
 390          */
 391         set_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags);
 392
 393         spin_lock_irqsave(&cm_id_priv->lock, flags);
 394         qp = cm_id_priv->qp;
 395         cm_id_priv->qp = NULL;
 396
 397         switch (cm_id_priv->state) {
 398         case IW_CM_STATE_LISTEN:
 399                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 400                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 401                 /* destroy the listening endpoint */
 402                 cm_id->device->ops.iw_destroy_listen(cm_id);
 403                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 404                 break;
 405         case IW_CM_STATE_ESTABLISHED:
 406                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 407                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 408                 /* Abrupt close of the connection */
 409                 (void)iwcm_modify_qp_err(qp);
 410                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 411                 break;
 412         case IW_CM_STATE_IDLE:
 413         case IW_CM_STATE_CLOSING:
 414                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 415                 break;
 416         case IW_CM_STATE_CONN_RECV:
 417                 /*
 418                  * App called destroy before/without calling accept after
 419                  * receiving connection request event notification or
 420                  * returned non zero from the event callback function.
 421                  * In either case, must tell the provider to reject.
 422                  */
 423                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 424                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 425                 cm_id->device->ops.iw_reject(cm_id, NULL, 0);
 426                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 427                 break;
 428         case IW_CM_STATE_CONN_SENT:
 429         case IW_CM_STATE_DESTROYING:
 430         default:
 431                 BUG();
 432                 break;
 433         }
 434         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 435         if (qp)
 436                 cm_id_priv->id.device->ops.iw_rem_ref(qp);
 437
 438         if (cm_id->mapped) {
 439                 iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr);
 440                 iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM);
 441         }
 442
 443         (void)iwcm_deref_id(cm_id_priv);
 444 }
 445
 446 /*
 447  * This function is only called by the application thread and cannot
 448  * be called by the event thread. The function will wait for all
 449  * references to be released on the cm_id and then kfree the cm_id
 450  * object.
 451  */
 452 void iw_destroy_cm_id(struct iw_cm_id *cm_id)
 453 {
 454         destroy_cm_id(cm_id);
 455 }
 456 EXPORT_SYMBOL(iw_destroy_cm_id);
 457
 458 /**
 459  * iw_cm_check_wildcard - If IP address is 0 then use original
 460  * @pm_addr: sockaddr containing the ip to check for wildcard
 461  * @cm_addr: sockaddr containing the actual IP address
 462  * @cm_outaddr: sockaddr to set IP addr which leaving port
 463  *
 464  *  Checks the pm_addr for wildcard and then sets cm_outaddr's
 465  *  IP to the actual (cm_addr).
 466  */
 467 static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr,
 468                                  struct sockaddr_storage *cm_addr,
 469                                  struct sockaddr_storage *cm_outaddr)
 470 {
 471         if (pm_addr->ss_family == AF_INET) {
 472                 struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr;
 473
 474                 if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) {
 475                         struct sockaddr_in *cm4_addr =
 476                                 (struct sockaddr_in *)cm_addr;
 477                         struct sockaddr_in *cm4_outaddr =
 478                                 (struct sockaddr_in *)cm_outaddr;
 479
 480                         cm4_outaddr->sin_addr = cm4_addr->sin_addr;
 481                 }
 482         } else {
 483                 struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr;
 484
 485                 if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) {
 486                         struct sockaddr_in6 *cm6_addr =
 487                                 (struct sockaddr_in6 *)cm_addr;
 488                         struct sockaddr_in6 *cm6_outaddr =
 489                                 (struct sockaddr_in6 *)cm_outaddr;
 490
 491                         cm6_outaddr->sin6_addr = cm6_addr->sin6_addr;
 492                 }
 493         }
 494 }
 495
 496 /**
 497  * iw_cm_map - Use portmapper to map the ports
 498  * @cm_id: connection manager pointer
 499  * @active: Indicates the active side when true
 500  * returns nonzero for error only if iwpm_create_mapinfo() fails
 501  *
 502  * Tries to add a mapping for a port using the Portmapper. If
 503  * successful in mapping the IP/Port it will check the remote
 504  * mapped IP address for a wildcard IP address and replace the
 505  * zero IP address with the remote_addr.
 506  */
 507 static int iw_cm_map(struct iw_cm_id *cm_id, bool active)
 508 {
 509         const char *devname = dev_name(&cm_id->device->dev);
 510         const char *ifname = cm_id->device->iw_ifname;
 511         struct iwpm_dev_data pm_reg_msg = {};
 512         struct iwpm_sa_data pm_msg;
 513         int status;
 514
 515         if (strlen(devname) >= sizeof(pm_reg_msg.dev_name) ||
 516             strlen(ifname) >= sizeof(pm_reg_msg.if_name))
 517                 return -EINVAL;
 518
 519         cm_id->m_local_addr = cm_id->local_addr;
 520         cm_id->m_remote_addr = cm_id->remote_addr;
 521
 522         strcpy(pm_reg_msg.dev_name, devname);
 523         strcpy(pm_reg_msg.if_name, ifname);
 524
 525         if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) ||
 526             !iwpm_valid_pid())
 527                 return 0;
 528
 529         cm_id->mapped = true;
 530         pm_msg.loc_addr = cm_id->local_addr;
 531         pm_msg.rem_addr = cm_id->remote_addr;
 532         pm_msg.flags = (cm_id->device->iw_driver_flags & IW_F_NO_PORT_MAP) ?
 533                        IWPM_FLAGS_NO_PORT_MAP : 0;
 534         if (active)
 535                 status = iwpm_add_and_query_mapping(&pm_msg,
 536                                                     RDMA_NL_IWCM);
 537         else
 538                 status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM);
 539
 540         if (!status) {
 541                 cm_id->m_local_addr = pm_msg.mapped_loc_addr;
 542                 if (active) {
 543                         cm_id->m_remote_addr = pm_msg.mapped_rem_addr;
 544                         iw_cm_check_wildcard(&pm_msg.mapped_rem_addr,
 545                                              &cm_id->remote_addr,
 546                                              &cm_id->m_remote_addr);
 547                 }
 548         }
 549
 550         return iwpm_create_mapinfo(&cm_id->local_addr,
 551                                    &cm_id->m_local_addr,
 552                                    RDMA_NL_IWCM, pm_msg.flags);
 553 }
 554
 555 /*
 556  * CM_ID <-- LISTEN
 557  *
 558  * Start listening for connect requests. Generates one CONNECT_REQUEST
 559  * event for each inbound connect request.
 560  */
 561 int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
 562 {
 563         struct iwcm_id_private *cm_id_priv;
 564         unsigned long flags;
 565         int ret;
 566
 567         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 568
 569         if (!backlog)
 570                 backlog = default_backlog;
 571
 572         ret = alloc_work_entries(cm_id_priv, backlog);
 573         if (ret)
 574                 return ret;
 575
 576         spin_lock_irqsave(&cm_id_priv->lock, flags);
 577         switch (cm_id_priv->state) {
 578         case IW_CM_STATE_IDLE:
 579                 cm_id_priv->state = IW_CM_STATE_LISTEN;
 580                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 581                 ret = iw_cm_map(cm_id, false);
 582                 if (!ret)
 583                         ret = cm_id->device->ops.iw_create_listen(cm_id,
 584                                                                   backlog);
 585                 if (ret)
 586                         cm_id_priv->state = IW_CM_STATE_IDLE;
 587                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 588                 break;
 589         default:
 590                 ret = -EINVAL;
 591         }
 592         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 593
 594         return ret;
 595 }
 596 EXPORT_SYMBOL(iw_cm_listen);
 597
 598 /*
 599  * CM_ID <-- IDLE
 600  *
 601  * Rejects an inbound connection request. No events are generated.
 602  */
 603 int iw_cm_reject(struct iw_cm_id *cm_id,
 604                  const void *private_data,
 605                  u8 private_data_len)
 606 {
 607         struct iwcm_id_private *cm_id_priv;
 608         unsigned long flags;
 609         int ret;
 610
 611         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 612         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 613
 614         spin_lock_irqsave(&cm_id_priv->lock, flags);
 615         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 616                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 617                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 618                 wake_up_all(&cm_id_priv->connect_wait);
 619                 return -EINVAL;
 620         }
 621         cm_id_priv->state = IW_CM_STATE_IDLE;
 622         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 623
 624         ret = cm_id->device->ops.iw_reject(cm_id, private_data,
 625                                           private_data_len);
 626
 627         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 628         wake_up_all(&cm_id_priv->connect_wait);
 629
 630         return ret;
 631 }
 632 EXPORT_SYMBOL(iw_cm_reject);
 633
 634 /*
 635  * CM_ID <-- ESTABLISHED
 636  *
 637  * Accepts an inbound connection request and generates an ESTABLISHED
 638  * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
 639  * until the ESTABLISHED event is received from the provider.
 640  */
 641 int iw_cm_accept(struct iw_cm_id *cm_id,
 642                  struct iw_cm_conn_param *iw_param)
 643 {
 644         struct iwcm_id_private *cm_id_priv;
 645         struct ib_qp *qp;
 646         unsigned long flags;
 647         int ret;
 648
 649         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 650         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 651
 652         spin_lock_irqsave(&cm_id_priv->lock, flags);
 653         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 654                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 655                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 656                 wake_up_all(&cm_id_priv->connect_wait);
 657                 return -EINVAL;
 658         }
 659         /* Get the ib_qp given the QPN */
 660         qp = cm_id->device->ops.iw_get_qp(cm_id->device, iw_param->qpn);
 661         if (!qp) {
 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                 return -EINVAL;
 666         }
 667         cm_id->device->ops.iw_add_ref(qp);
 668         cm_id_priv->qp = qp;
 669         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 670
 671         ret = cm_id->device->ops.iw_accept(cm_id, iw_param);
 672         if (ret) {
 673                 /* An error on accept precludes provider events */
 674                 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 675                 cm_id_priv->state = IW_CM_STATE_IDLE;
 676                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 677                 qp = cm_id_priv->qp;
 678                 cm_id_priv->qp = NULL;
 679                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 680                 if (qp)
 681                         cm_id->device->ops.iw_rem_ref(qp);
 682                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 683                 wake_up_all(&cm_id_priv->connect_wait);
 684         }
 685
 686         return ret;
 687 }
 688 EXPORT_SYMBOL(iw_cm_accept);
 689
 690 /*
 691  * Active Side: CM_ID <-- CONN_SENT
 692  *
 693  * If successful, results in the generation of a CONNECT_REPLY
 694  * event. iw_cm_disconnect and iw_cm_destroy will block until the
 695  * CONNECT_REPLY event is received from the provider.
 696  */
 697 int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param)
 698 {
 699         struct iwcm_id_private *cm_id_priv;
 700         int ret;
 701         unsigned long flags;
 702         struct ib_qp *qp = NULL;
 703
 704         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 705
 706         ret = alloc_work_entries(cm_id_priv, 4);
 707         if (ret)
 708                 return ret;
 709
 710         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 711         spin_lock_irqsave(&cm_id_priv->lock, flags);
 712
 713         if (cm_id_priv->state != IW_CM_STATE_IDLE) {
 714                 ret = -EINVAL;
 715                 goto err;
 716         }
 717
 718         /* Get the ib_qp given the QPN */
 719         qp = cm_id->device->ops.iw_get_qp(cm_id->device, iw_param->qpn);
 720         if (!qp) {
 721                 ret = -EINVAL;
 722                 goto err;
 723         }
 724         cm_id->device->ops.iw_add_ref(qp);
 725         cm_id_priv->qp = qp;
 726         cm_id_priv->state = IW_CM_STATE_CONN_SENT;
 727         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 728
 729         ret = iw_cm_map(cm_id, true);
 730         if (!ret)
 731                 ret = cm_id->device->ops.iw_connect(cm_id, iw_param);
 732         if (!ret)
 733                 return 0;       /* success */
 734
 735         spin_lock_irqsave(&cm_id_priv->lock, flags);
 736         qp = cm_id_priv->qp;
 737         cm_id_priv->qp = NULL;
 738         cm_id_priv->state = IW_CM_STATE_IDLE;
 739 err:
 740         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 741         if (qp)
 742                 cm_id->device->ops.iw_rem_ref(qp);
 743         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 744         wake_up_all(&cm_id_priv->connect_wait);
 745         return ret;
 746 }
 747 EXPORT_SYMBOL(iw_cm_connect);
 748
 749 /*
 750  * Passive Side: new CM_ID <-- CONN_RECV
 751  *
 752  * Handles an inbound connect request. The function creates a new
 753  * iw_cm_id to represent the new connection and inherits the client
 754  * callback function and other attributes from the listening parent.
 755  *
 756  * The work item contains a pointer to the listen_cm_id and the event. The
 757  * listen_cm_id contains the client cm_handler, context and
 758  * device. These are copied when the device is cloned. The event
 759  * contains the new four tuple.
 760  *
 761  * An error on the child should not affect the parent, so this
 762  * function does not return a value.
 763  */
 764 static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv,
 765                                 struct iw_cm_event *iw_event)
 766 {
 767         unsigned long flags;
 768         struct iw_cm_id *cm_id;
 769         struct iwcm_id_private *cm_id_priv;
 770         int ret;
 771
 772         /*
 773          * The provider should never generate a connection request
 774          * event with a bad status.
 775          */
 776         BUG_ON(iw_event->status);
 777
 778         cm_id = iw_create_cm_id(listen_id_priv->id.device,
 779                                 listen_id_priv->id.cm_handler,
 780                                 listen_id_priv->id.context);
 781         /* If the cm_id could not be created, ignore the request */
 782         if (IS_ERR(cm_id))
 783                 goto out;
 784
 785         cm_id->provider_data = iw_event->provider_data;
 786         cm_id->m_local_addr = iw_event->local_addr;
 787         cm_id->m_remote_addr = iw_event->remote_addr;
 788         cm_id->local_addr = listen_id_priv->id.local_addr;
 789
 790         ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr,
 791                                    &iw_event->remote_addr,
 792                                    &cm_id->remote_addr,
 793                                    RDMA_NL_IWCM);
 794         if (ret) {
 795                 cm_id->remote_addr = iw_event->remote_addr;
 796         } else {
 797                 iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr,
 798                                      &iw_event->local_addr,
 799                                      &cm_id->local_addr);
 800                 iw_event->local_addr = cm_id->local_addr;
 801                 iw_event->remote_addr = cm_id->remote_addr;
 802         }
 803
 804         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 805         cm_id_priv->state = IW_CM_STATE_CONN_RECV;
 806
 807         /*
 808          * We could be destroying the listening id. If so, ignore this
 809          * upcall.
 810          */
 811         spin_lock_irqsave(&listen_id_priv->lock, flags);
 812         if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
 813                 spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 814                 iw_cm_reject(cm_id, NULL, 0);
 815                 iw_destroy_cm_id(cm_id);
 816                 goto out;
 817         }
 818         spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 819
 820         ret = alloc_work_entries(cm_id_priv, 3);
 821         if (ret) {
 822                 iw_cm_reject(cm_id, NULL, 0);
 823                 iw_destroy_cm_id(cm_id);
 824                 goto out;
 825         }
 826
 827         /* Call the client CM handler */
 828         ret = cm_id->cm_handler(cm_id, iw_event);
 829         if (ret) {
 830                 iw_cm_reject(cm_id, NULL, 0);
 831                 iw_destroy_cm_id(cm_id);
 832         }
 833
 834 out:
 835         if (iw_event->private_data_len)
 836                 kfree(iw_event->private_data);
 837 }
 838
 839 /*
 840  * Passive Side: CM_ID <-- ESTABLISHED
 841  *
 842  * The provider generated an ESTABLISHED event which means that
 843  * the MPA negotion has completed successfully and we are now in MPA
 844  * FPDU mode.
 845  *
 846  * This event can only be received in the CONN_RECV state. If the
 847  * remote peer closed, the ESTABLISHED event would be received followed
 848  * by the CLOSE event. If the app closes, it will block until we wake
 849  * it up after processing this event.
 850  */
 851 static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv,
 852                                struct iw_cm_event *iw_event)
 853 {
 854         unsigned long flags;
 855         int ret;
 856
 857         spin_lock_irqsave(&cm_id_priv->lock, flags);
 858
 859         /*
 860          * We clear the CONNECT_WAIT bit here to allow the callback
 861          * function to call iw_cm_disconnect. Calling iw_destroy_cm_id
 862          * from a callback handler is not allowed.
 863          */
 864         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 865         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 866         cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 867         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 868         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 869         wake_up_all(&cm_id_priv->connect_wait);
 870
 871         return ret;
 872 }
 873
 874 /*
 875  * Active Side: CM_ID <-- ESTABLISHED
 876  *
 877  * The app has called connect and is waiting for the established event to
 878  * post it's requests to the server. This event will wake up anyone
 879  * blocked in iw_cm_disconnect or iw_destroy_id.
 880  */
 881 static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv,
 882                                struct iw_cm_event *iw_event)
 883 {
 884         struct ib_qp *qp = NULL;
 885         unsigned long flags;
 886         int ret;
 887
 888         spin_lock_irqsave(&cm_id_priv->lock, flags);
 889         /*
 890          * Clear the connect wait bit so a callback function calling
 891          * iw_cm_disconnect will not wait and deadlock this thread
 892          */
 893         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 894         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
 895         if (iw_event->status == 0) {
 896                 cm_id_priv->id.m_local_addr = iw_event->local_addr;
 897                 cm_id_priv->id.m_remote_addr = iw_event->remote_addr;
 898                 iw_event->local_addr = cm_id_priv->id.local_addr;
 899                 iw_event->remote_addr = cm_id_priv->id.remote_addr;
 900                 cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 901         } else {
 902                 /* REJECTED or RESET */
 903                 qp = cm_id_priv->qp;
 904                 cm_id_priv->qp = NULL;
 905                 cm_id_priv->state = IW_CM_STATE_IDLE;
 906         }
 907         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 908         if (qp)
 909                 cm_id_priv->id.device->ops.iw_rem_ref(qp);
 910         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 911
 912         if (iw_event->private_data_len)
 913                 kfree(iw_event->private_data);
 914
 915         /* Wake up waiters on connect complete */
 916         wake_up_all(&cm_id_priv->connect_wait);
 917
 918         return ret;
 919 }
 920
 921 /*
 922  * CM_ID <-- CLOSING
 923  *
 924  * If in the ESTABLISHED state, move to CLOSING.
 925  */
 926 static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv,
 927                                   struct iw_cm_event *iw_event)
 928 {
 929         unsigned long flags;
 930
 931         spin_lock_irqsave(&cm_id_priv->lock, flags);
 932         if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
 933                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 934         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 935 }
 936
 937 /*
 938  * CM_ID <-- IDLE
 939  *
 940  * If in the ESTBLISHED or CLOSING states, the QP will have have been
 941  * moved by the provider to the ERR state. Disassociate the CM_ID from
 942  * the QP,  move to IDLE, and remove the 'connected' reference.
 943  *
 944  * If in some other state, the cm_id was destroyed asynchronously.
 945  * This is the last reference that will result in waking up
 946  * the app thread blocked in iw_destroy_cm_id.
 947  */
 948 static int cm_close_handler(struct iwcm_id_private *cm_id_priv,
 949                                   struct iw_cm_event *iw_event)
 950 {
 951         struct ib_qp *qp;
 952         unsigned long flags;
 953         int ret = 0, notify_event = 0;
 954         spin_lock_irqsave(&cm_id_priv->lock, flags);
 955         qp = cm_id_priv->qp;
 956         cm_id_priv->qp = NULL;
 957
 958         switch (cm_id_priv->state) {
 959         case IW_CM_STATE_ESTABLISHED:
 960         case IW_CM_STATE_CLOSING:
 961                 cm_id_priv->state = IW_CM_STATE_IDLE;
 962                 notify_event = 1;
 963                 break;
 964         case IW_CM_STATE_DESTROYING:
 965                 break;
 966         default:
 967                 BUG();
 968         }
 969         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 970
 971         if (qp)
 972                 cm_id_priv->id.device->ops.iw_rem_ref(qp);
 973         if (notify_event)
 974                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 975         return ret;
 976 }
 977
 978 static int process_event(struct iwcm_id_private *cm_id_priv,
 979                          struct iw_cm_event *iw_event)
 980 {
 981         int ret = 0;
 982
 983         switch (iw_event->event) {
 984         case IW_CM_EVENT_CONNECT_REQUEST:
 985                 cm_conn_req_handler(cm_id_priv, iw_event);
 986                 break;
 987         case IW_CM_EVENT_CONNECT_REPLY:
 988                 ret = cm_conn_rep_handler(cm_id_priv, iw_event);
 989                 break;
 990         case IW_CM_EVENT_ESTABLISHED:
 991                 ret = cm_conn_est_handler(cm_id_priv, iw_event);
 992                 break;
 993         case IW_CM_EVENT_DISCONNECT:
 994                 cm_disconnect_handler(cm_id_priv, iw_event);
 995                 break;
 996         case IW_CM_EVENT_CLOSE:
 997                 ret = cm_close_handler(cm_id_priv, iw_event);
 998                 break;
 999         default:
1000                 BUG();
1001         }
1002
1003         return ret;
1004 }
1005
1006 /*
1007  * Process events on the work_list for the cm_id. If the callback
1008  * function requests that the cm_id be deleted, a flag is set in the
1009  * cm_id flags to indicate that when the last reference is
1010  * removed, the cm_id is to be destroyed. This is necessary to
1011  * distinguish between an object that will be destroyed by the app
1012  * thread asleep on the destroy_comp list vs. an object destroyed
1013  * here synchronously when the last reference is removed.
1014  */
1015 static void cm_work_handler(struct work_struct *_work)
1016 {
1017         struct iwcm_work *work = container_of(_work, struct iwcm_work, work);
1018         struct iw_cm_event levent;
1019         struct iwcm_id_private *cm_id_priv = work->cm_id;
1020         unsigned long flags;
1021         int empty;
1022         int ret = 0;
1023
1024         spin_lock_irqsave(&cm_id_priv->lock, flags);
1025         empty = list_empty(&cm_id_priv->work_list);
1026         while (!empty) {
1027                 work = list_entry(cm_id_priv->work_list.next,
1028                                   struct iwcm_work, list);
1029                 list_del_init(&work->list);
1030                 empty = list_empty(&cm_id_priv->work_list);
1031                 levent = work->event;
1032                 put_work(work);
1033                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1034
1035                 if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) {
1036                         ret = process_event(cm_id_priv, &levent);
1037                         if (ret)
1038                                 destroy_cm_id(&cm_id_priv->id);
1039                 } else
1040                         pr_debug("dropping event %d\n", levent.event);
1041                 if (iwcm_deref_id(cm_id_priv))
1042                         return;
1043                 if (empty)
1044                         return;
1045                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1046         }
1047         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1048 }
1049
1050 /*
1051  * This function is called on interrupt context. Schedule events on
1052  * the iwcm_wq thread to allow callback functions to downcall into
1053  * the CM and/or block.  Events are queued to a per-CM_ID
1054  * work_list. If this is the first event on the work_list, the work
1055  * element is also queued on the iwcm_wq thread.
1056  *
1057  * Each event holds a reference on the cm_id. Until the last posted
1058  * event has been delivered and processed, the cm_id cannot be
1059  * deleted.
1060  *
1061  * Returns:
1062  *            0 - the event was handled.
1063  *      -ENOMEM - the event was not handled due to lack of resources.
1064  */
1065 static int cm_event_handler(struct iw_cm_id *cm_id,
1066                              struct iw_cm_event *iw_event)
1067 {
1068         struct iwcm_work *work;
1069         struct iwcm_id_private *cm_id_priv;
1070         unsigned long flags;
1071         int ret = 0;
1072
1073         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1074
1075         spin_lock_irqsave(&cm_id_priv->lock, flags);
1076         work = get_work(cm_id_priv);
1077         if (!work) {
1078                 ret = -ENOMEM;
1079                 goto out;
1080         }
1081
1082         INIT_WORK(&work->work, cm_work_handler);
1083         work->cm_id = cm_id_priv;
1084         work->event = *iw_event;
1085
1086         if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST ||
1087              work->event.event == IW_CM_EVENT_CONNECT_REPLY) &&
1088             work->event.private_data_len) {
1089                 ret = copy_private_data(&work->event);
1090                 if (ret) {
1091                         put_work(work);
1092                         goto out;
1093                 }
1094         }
1095
1096         refcount_inc(&cm_id_priv->refcount);
1097         if (list_empty(&cm_id_priv->work_list)) {
1098                 list_add_tail(&work->list, &cm_id_priv->work_list);
1099                 queue_work(iwcm_wq, &work->work);
1100         } else
1101                 list_add_tail(&work->list, &cm_id_priv->work_list);
1102 out:
1103         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1104         return ret;
1105 }
1106
1107 static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv,
1108                                   struct ib_qp_attr *qp_attr,
1109                                   int *qp_attr_mask)
1110 {
1111         unsigned long flags;
1112         int ret;
1113
1114         spin_lock_irqsave(&cm_id_priv->lock, flags);
1115         switch (cm_id_priv->state) {
1116         case IW_CM_STATE_IDLE:
1117         case IW_CM_STATE_CONN_SENT:
1118         case IW_CM_STATE_CONN_RECV:
1119         case IW_CM_STATE_ESTABLISHED:
1120                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1121                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
1122                                            IB_ACCESS_REMOTE_READ;
1123                 ret = 0;
1124                 break;
1125         default:
1126                 ret = -EINVAL;
1127                 break;
1128         }
1129         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1130         return ret;
1131 }
1132
1133 static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
1134                                   struct ib_qp_attr *qp_attr,
1135                                   int *qp_attr_mask)
1136 {
1137         unsigned long flags;
1138         int ret;
1139
1140         spin_lock_irqsave(&cm_id_priv->lock, flags);
1141         switch (cm_id_priv->state) {
1142         case IW_CM_STATE_IDLE:
1143         case IW_CM_STATE_CONN_SENT:
1144         case IW_CM_STATE_CONN_RECV:
1145         case IW_CM_STATE_ESTABLISHED:
1146                 *qp_attr_mask = 0;
1147                 ret = 0;
1148                 break;
1149         default:
1150                 ret = -EINVAL;
1151                 break;
1152         }
1153         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1154         return ret;
1155 }
1156
1157 int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
1158                        struct ib_qp_attr *qp_attr,
1159                        int *qp_attr_mask)
1160 {
1161         struct iwcm_id_private *cm_id_priv;
1162         int ret;
1163
1164         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1165         switch (qp_attr->qp_state) {
1166         case IB_QPS_INIT:
1167         case IB_QPS_RTR:
1168                 ret = iwcm_init_qp_init_attr(cm_id_priv,
1169                                              qp_attr, qp_attr_mask);
1170                 break;
1171         case IB_QPS_RTS:
1172                 ret = iwcm_init_qp_rts_attr(cm_id_priv,
1173                                             qp_attr, qp_attr_mask);
1174                 break;
1175         default:
1176                 ret = -EINVAL;
1177                 break;
1178         }
1179         return ret;
1180 }
1181 EXPORT_SYMBOL(iw_cm_init_qp_attr);
1182
1183 static int __init iw_cm_init(void)
1184 {
1185         int ret;
1186
1187         ret = iwpm_init(RDMA_NL_IWCM);
1188         if (ret)
1189                 return ret;
1190
1191         iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", 0);
1192         if (!iwcm_wq)
1193                 goto err_alloc;
1194
1195         iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm",
1196                                                  iwcm_ctl_table);
1197         if (!iwcm_ctl_table_hdr) {
1198                 pr_err("iw_cm: couldn't register sysctl paths\n");
1199                 goto err_sysctl;
1200         }
1201
1202         rdma_nl_register(RDMA_NL_IWCM, iwcm_nl_cb_table);
1203         return 0;
1204
1205 err_sysctl:
1206         destroy_workqueue(iwcm_wq);
1207 err_alloc:
1208         iwpm_exit(RDMA_NL_IWCM);
1209         return -ENOMEM;
1210 }
1211
1212 static void __exit iw_cm_cleanup(void)
1213 {
1214         rdma_nl_unregister(RDMA_NL_IWCM);
1215         unregister_net_sysctl_table(iwcm_ctl_table_hdr);
1216         destroy_workqueue(iwcm_wq);
1217         iwpm_exit(RDMA_NL_IWCM);
1218 }
1219
1220 MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2);
1221
1222 module_init(iw_cm_init);
1223 module_exit(iw_cm_cleanup);