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_entry(cm_id_priv->work_free_list.next, struct iwcm_work,
 147                           free_list);
 148         list_del_init(&work->free_list);
 149         return work;
 150 }
 151
 152 static void put_work(struct iwcm_work *work)
 153 {
 154         list_add(&work->free_list, &work->cm_id->work_free_list);
 155 }
 156
 157 static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv)
 158 {
 159         struct list_head *e, *tmp;
 160
 161         list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) {
 162                 list_del(e);
 163                 kfree(list_entry(e, struct iwcm_work, free_list));
 164         }
 165 }
 166
 167 static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count)
 168 {
 169         struct iwcm_work *work;
 170
 171         BUG_ON(!list_empty(&cm_id_priv->work_free_list));
 172         while (count--) {
 173                 work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL);
 174                 if (!work) {
 175                         dealloc_work_entries(cm_id_priv);
 176                         return -ENOMEM;
 177                 }
 178                 work->cm_id = cm_id_priv;
 179                 INIT_LIST_HEAD(&work->list);
 180                 put_work(work);
 181         }
 182         return 0;
 183 }
 184
 185 /*
 186  * Save private data from incoming connection requests to
 187  * iw_cm_event, so the low level driver doesn't have to. Adjust
 188  * the event ptr to point to the local copy.
 189  */
 190 static int copy_private_data(struct iw_cm_event *event)
 191 {
 192         void *p;
 193
 194         p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC);
 195         if (!p)
 196                 return -ENOMEM;
 197         event->private_data = p;
 198         return 0;
 199 }
 200
 201 static void free_cm_id(struct iwcm_id_private *cm_id_priv)
 202 {
 203         dealloc_work_entries(cm_id_priv);
 204         kfree(cm_id_priv);
 205 }
 206
 207 /*
 208  * Release a reference on cm_id. If the last reference is being
 209  * released, free the cm_id and return 1.
 210  */
 211 static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
 212 {
 213         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 1;
 217         }
 218
 219         return 0;
 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 static void destroy_cm_id(struct iw_cm_id *cm_id)
 373 {
 374         struct iwcm_id_private *cm_id_priv;
 375         struct ib_qp *qp;
 376         unsigned long flags;
 377
 378         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 379         /*
 380          * Wait if we're currently in a connect or accept downcall. A
 381          * listening endpoint should never block here.
 382          */
 383         wait_event(cm_id_priv->connect_wait,
 384                    !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 385
 386         /*
 387          * Since we're deleting the cm_id, drop any events that
 388          * might arrive before the last dereference.
 389          */
 390         set_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags);
 391
 392         spin_lock_irqsave(&cm_id_priv->lock, flags);
 393         qp = cm_id_priv->qp;
 394         cm_id_priv->qp = NULL;
 395
 396         switch (cm_id_priv->state) {
 397         case IW_CM_STATE_LISTEN:
 398                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 399                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 400                 /* destroy the listening endpoint */
 401                 cm_id->device->ops.iw_destroy_listen(cm_id);
 402                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 403                 break;
 404         case IW_CM_STATE_ESTABLISHED:
 405                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 406                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 407                 /* Abrupt close of the connection */
 408                 (void)iwcm_modify_qp_err(qp);
 409                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 410                 break;
 411         case IW_CM_STATE_IDLE:
 412         case IW_CM_STATE_CLOSING:
 413                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 414                 break;
 415         case IW_CM_STATE_CONN_RECV:
 416                 /*
 417                  * App called destroy before/without calling accept after
 418                  * receiving connection request event notification or
 419                  * returned non zero from the event callback function.
 420                  * In either case, must tell the provider to reject.
 421                  */
 422                 cm_id_priv->state = IW_CM_STATE_DESTROYING;
 423                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 424                 cm_id->device->ops.iw_reject(cm_id, NULL, 0);
 425                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 426                 break;
 427         case IW_CM_STATE_CONN_SENT:
 428         case IW_CM_STATE_DESTROYING:
 429         default:
 430                 BUG();
 431                 break;
 432         }
 433         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 434         if (qp)
 435                 cm_id_priv->id.device->ops.iw_rem_ref(qp);
 436
 437         if (cm_id->mapped) {
 438                 iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr);
 439                 iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM);
 440         }
 441
 442         (void)iwcm_deref_id(cm_id_priv);
 443 }
 444
 445 /*
 446  * This function is only called by the application thread and cannot
 447  * be called by the event thread. The function will wait for all
 448  * references to be released on the cm_id and then kfree the cm_id
 449  * object.
 450  */
 451 void iw_destroy_cm_id(struct iw_cm_id *cm_id)
 452 {
 453         destroy_cm_id(cm_id);
 454 }
 455 EXPORT_SYMBOL(iw_destroy_cm_id);
 456
 457 /**
 458  * iw_cm_check_wildcard - If IP address is 0 then use original
 459  * @pm_addr: sockaddr containing the ip to check for wildcard
 460  * @cm_addr: sockaddr containing the actual IP address
 461  * @cm_outaddr: sockaddr to set IP addr which leaving port
 462  *
 463  *  Checks the pm_addr for wildcard and then sets cm_outaddr's
 464  *  IP to the actual (cm_addr).
 465  */
 466 static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr,
 467                                  struct sockaddr_storage *cm_addr,
 468                                  struct sockaddr_storage *cm_outaddr)
 469 {
 470         if (pm_addr->ss_family == AF_INET) {
 471                 struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr;
 472
 473                 if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) {
 474                         struct sockaddr_in *cm4_addr =
 475                                 (struct sockaddr_in *)cm_addr;
 476                         struct sockaddr_in *cm4_outaddr =
 477                                 (struct sockaddr_in *)cm_outaddr;
 478
 479                         cm4_outaddr->sin_addr = cm4_addr->sin_addr;
 480                 }
 481         } else {
 482                 struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr;
 483
 484                 if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) {
 485                         struct sockaddr_in6 *cm6_addr =
 486                                 (struct sockaddr_in6 *)cm_addr;
 487                         struct sockaddr_in6 *cm6_outaddr =
 488                                 (struct sockaddr_in6 *)cm_outaddr;
 489
 490                         cm6_outaddr->sin6_addr = cm6_addr->sin6_addr;
 491                 }
 492         }
 493 }
 494
 495 /**
 496  * iw_cm_map - Use portmapper to map the ports
 497  * @cm_id: connection manager pointer
 498  * @active: Indicates the active side when true
 499  * returns nonzero for error only if iwpm_create_mapinfo() fails
 500  *
 501  * Tries to add a mapping for a port using the Portmapper. If
 502  * successful in mapping the IP/Port it will check the remote
 503  * mapped IP address for a wildcard IP address and replace the
 504  * zero IP address with the remote_addr.
 505  */
 506 static int iw_cm_map(struct iw_cm_id *cm_id, bool active)
 507 {
 508         const char *devname = dev_name(&cm_id->device->dev);
 509         const char *ifname = cm_id->device->iw_ifname;
 510         struct iwpm_dev_data pm_reg_msg = {};
 511         struct iwpm_sa_data pm_msg;
 512         int status;
 513
 514         if (strlen(devname) >= sizeof(pm_reg_msg.dev_name) ||
 515             strlen(ifname) >= sizeof(pm_reg_msg.if_name))
 516                 return -EINVAL;
 517
 518         cm_id->m_local_addr = cm_id->local_addr;
 519         cm_id->m_remote_addr = cm_id->remote_addr;
 520
 521         strcpy(pm_reg_msg.dev_name, devname);
 522         strcpy(pm_reg_msg.if_name, ifname);
 523
 524         if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) ||
 525             !iwpm_valid_pid())
 526                 return 0;
 527
 528         cm_id->mapped = true;
 529         pm_msg.loc_addr = cm_id->local_addr;
 530         pm_msg.rem_addr = cm_id->remote_addr;
 531         pm_msg.flags = (cm_id->device->iw_driver_flags & IW_F_NO_PORT_MAP) ?
 532                        IWPM_FLAGS_NO_PORT_MAP : 0;
 533         if (active)
 534                 status = iwpm_add_and_query_mapping(&pm_msg,
 535                                                     RDMA_NL_IWCM);
 536         else
 537                 status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM);
 538
 539         if (!status) {
 540                 cm_id->m_local_addr = pm_msg.mapped_loc_addr;
 541                 if (active) {
 542                         cm_id->m_remote_addr = pm_msg.mapped_rem_addr;
 543                         iw_cm_check_wildcard(&pm_msg.mapped_rem_addr,
 544                                              &cm_id->remote_addr,
 545                                              &cm_id->m_remote_addr);
 546                 }
 547         }
 548
 549         return iwpm_create_mapinfo(&cm_id->local_addr,
 550                                    &cm_id->m_local_addr,
 551                                    RDMA_NL_IWCM, pm_msg.flags);
 552 }
 553
 554 /*
 555  * CM_ID <-- LISTEN
 556  *
 557  * Start listening for connect requests. Generates one CONNECT_REQUEST
 558  * event for each inbound connect request.
 559  */
 560 int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
 561 {
 562         struct iwcm_id_private *cm_id_priv;
 563         unsigned long flags;
 564         int ret;
 565
 566         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 567
 568         if (!backlog)
 569                 backlog = default_backlog;
 570
 571         ret = alloc_work_entries(cm_id_priv, backlog);
 572         if (ret)
 573                 return ret;
 574
 575         spin_lock_irqsave(&cm_id_priv->lock, flags);
 576         switch (cm_id_priv->state) {
 577         case IW_CM_STATE_IDLE:
 578                 cm_id_priv->state = IW_CM_STATE_LISTEN;
 579                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 580                 ret = iw_cm_map(cm_id, false);
 581                 if (!ret)
 582                         ret = cm_id->device->ops.iw_create_listen(cm_id,
 583                                                                   backlog);
 584                 if (ret)
 585                         cm_id_priv->state = IW_CM_STATE_IDLE;
 586                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 587                 break;
 588         default:
 589                 ret = -EINVAL;
 590         }
 591         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 592
 593         return ret;
 594 }
 595 EXPORT_SYMBOL(iw_cm_listen);
 596
 597 /*
 598  * CM_ID <-- IDLE
 599  *
 600  * Rejects an inbound connection request. No events are generated.
 601  */
 602 int iw_cm_reject(struct iw_cm_id *cm_id,
 603                  const void *private_data,
 604                  u8 private_data_len)
 605 {
 606         struct iwcm_id_private *cm_id_priv;
 607         unsigned long flags;
 608         int ret;
 609
 610         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 611         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 612
 613         spin_lock_irqsave(&cm_id_priv->lock, flags);
 614         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 615                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 616                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 617                 wake_up_all(&cm_id_priv->connect_wait);
 618                 return -EINVAL;
 619         }
 620         cm_id_priv->state = IW_CM_STATE_IDLE;
 621         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 622
 623         ret = cm_id->device->ops.iw_reject(cm_id, private_data,
 624                                           private_data_len);
 625
 626         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 627         wake_up_all(&cm_id_priv->connect_wait);
 628
 629         return ret;
 630 }
 631 EXPORT_SYMBOL(iw_cm_reject);
 632
 633 /*
 634  * CM_ID <-- ESTABLISHED
 635  *
 636  * Accepts an inbound connection request and generates an ESTABLISHED
 637  * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
 638  * until the ESTABLISHED event is received from the provider.
 639  */
 640 int iw_cm_accept(struct iw_cm_id *cm_id,
 641                  struct iw_cm_conn_param *iw_param)
 642 {
 643         struct iwcm_id_private *cm_id_priv;
 644         struct ib_qp *qp;
 645         unsigned long flags;
 646         int ret;
 647
 648         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 649         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 650
 651         spin_lock_irqsave(&cm_id_priv->lock, flags);
 652         if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
 653                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 654                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 655                 wake_up_all(&cm_id_priv->connect_wait);
 656                 return -EINVAL;
 657         }
 658         /* Get the ib_qp given the QPN */
 659         qp = cm_id->device->ops.iw_get_qp(cm_id->device, iw_param->qpn);
 660         if (!qp) {
 661                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 662                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 663                 wake_up_all(&cm_id_priv->connect_wait);
 664                 return -EINVAL;
 665         }
 666         cm_id->device->ops.iw_add_ref(qp);
 667         cm_id_priv->qp = qp;
 668         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 669
 670         ret = cm_id->device->ops.iw_accept(cm_id, iw_param);
 671         if (ret) {
 672                 /* An error on accept precludes provider events */
 673                 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 674                 cm_id_priv->state = IW_CM_STATE_IDLE;
 675                 spin_lock_irqsave(&cm_id_priv->lock, flags);
 676                 qp = cm_id_priv->qp;
 677                 cm_id_priv->qp = NULL;
 678                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 679                 if (qp)
 680                         cm_id->device->ops.iw_rem_ref(qp);
 681                 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 682                 wake_up_all(&cm_id_priv->connect_wait);
 683         }
 684
 685         return ret;
 686 }
 687 EXPORT_SYMBOL(iw_cm_accept);
 688
 689 /*
 690  * Active Side: CM_ID <-- CONN_SENT
 691  *
 692  * If successful, results in the generation of a CONNECT_REPLY
 693  * event. iw_cm_disconnect and iw_cm_destroy will block until the
 694  * CONNECT_REPLY event is received from the provider.
 695  */
 696 int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param)
 697 {
 698         struct iwcm_id_private *cm_id_priv;
 699         int ret;
 700         unsigned long flags;
 701         struct ib_qp *qp = NULL;
 702
 703         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 704
 705         ret = alloc_work_entries(cm_id_priv, 4);
 706         if (ret)
 707                 return ret;
 708
 709         set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 710         spin_lock_irqsave(&cm_id_priv->lock, flags);
 711
 712         if (cm_id_priv->state != IW_CM_STATE_IDLE) {
 713                 ret = -EINVAL;
 714                 goto err;
 715         }
 716
 717         /* Get the ib_qp given the QPN */
 718         qp = cm_id->device->ops.iw_get_qp(cm_id->device, iw_param->qpn);
 719         if (!qp) {
 720                 ret = -EINVAL;
 721                 goto err;
 722         }
 723         cm_id->device->ops.iw_add_ref(qp);
 724         cm_id_priv->qp = qp;
 725         cm_id_priv->state = IW_CM_STATE_CONN_SENT;
 726         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 727
 728         ret = iw_cm_map(cm_id, true);
 729         if (!ret)
 730                 ret = cm_id->device->ops.iw_connect(cm_id, iw_param);
 731         if (!ret)
 732                 return 0;       /* success */
 733
 734         spin_lock_irqsave(&cm_id_priv->lock, flags);
 735         qp = cm_id_priv->qp;
 736         cm_id_priv->qp = NULL;
 737         cm_id_priv->state = IW_CM_STATE_IDLE;
 738 err:
 739         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 740         if (qp)
 741                 cm_id->device->ops.iw_rem_ref(qp);
 742         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 743         wake_up_all(&cm_id_priv->connect_wait);
 744         return ret;
 745 }
 746 EXPORT_SYMBOL(iw_cm_connect);
 747
 748 /*
 749  * Passive Side: new CM_ID <-- CONN_RECV
 750  *
 751  * Handles an inbound connect request. The function creates a new
 752  * iw_cm_id to represent the new connection and inherits the client
 753  * callback function and other attributes from the listening parent.
 754  *
 755  * The work item contains a pointer to the listen_cm_id and the event. The
 756  * listen_cm_id contains the client cm_handler, context and
 757  * device. These are copied when the device is cloned. The event
 758  * contains the new four tuple.
 759  *
 760  * An error on the child should not affect the parent, so this
 761  * function does not return a value.
 762  */
 763 static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv,
 764                                 struct iw_cm_event *iw_event)
 765 {
 766         unsigned long flags;
 767         struct iw_cm_id *cm_id;
 768         struct iwcm_id_private *cm_id_priv;
 769         int ret;
 770
 771         /*
 772          * The provider should never generate a connection request
 773          * event with a bad status.
 774          */
 775         BUG_ON(iw_event->status);
 776
 777         cm_id = iw_create_cm_id(listen_id_priv->id.device,
 778                                 listen_id_priv->id.cm_handler,
 779                                 listen_id_priv->id.context);
 780         /* If the cm_id could not be created, ignore the request */
 781         if (IS_ERR(cm_id))
 782                 goto out;
 783
 784         cm_id->provider_data = iw_event->provider_data;
 785         cm_id->m_local_addr = iw_event->local_addr;
 786         cm_id->m_remote_addr = iw_event->remote_addr;
 787         cm_id->local_addr = listen_id_priv->id.local_addr;
 788
 789         ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr,
 790                                    &iw_event->remote_addr,
 791                                    &cm_id->remote_addr,
 792                                    RDMA_NL_IWCM);
 793         if (ret) {
 794                 cm_id->remote_addr = iw_event->remote_addr;
 795         } else {
 796                 iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr,
 797                                      &iw_event->local_addr,
 798                                      &cm_id->local_addr);
 799                 iw_event->local_addr = cm_id->local_addr;
 800                 iw_event->remote_addr = cm_id->remote_addr;
 801         }
 802
 803         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 804         cm_id_priv->state = IW_CM_STATE_CONN_RECV;
 805
 806         /*
 807          * We could be destroying the listening id. If so, ignore this
 808          * upcall.
 809          */
 810         spin_lock_irqsave(&listen_id_priv->lock, flags);
 811         if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
 812                 spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 813                 iw_cm_reject(cm_id, NULL, 0);
 814                 iw_destroy_cm_id(cm_id);
 815                 goto out;
 816         }
 817         spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 818
 819         ret = alloc_work_entries(cm_id_priv, 3);
 820         if (ret) {
 821                 iw_cm_reject(cm_id, NULL, 0);
 822                 iw_destroy_cm_id(cm_id);
 823                 goto out;
 824         }
 825
 826         /* Call the client CM handler */
 827         ret = cm_id->cm_handler(cm_id, iw_event);
 828         if (ret) {
 829                 iw_cm_reject(cm_id, NULL, 0);
 830                 iw_destroy_cm_id(cm_id);
 831         }
 832
 833 out:
 834         if (iw_event->private_data_len)
 835                 kfree(iw_event->private_data);
 836 }
 837
 838 /*
 839  * Passive Side: CM_ID <-- ESTABLISHED
 840  *
 841  * The provider generated an ESTABLISHED event which means that
 842  * the MPA negotion has completed successfully and we are now in MPA
 843  * FPDU mode.
 844  *
 845  * This event can only be received in the CONN_RECV state. If the
 846  * remote peer closed, the ESTABLISHED event would be received followed
 847  * by the CLOSE event. If the app closes, it will block until we wake
 848  * it up after processing this event.
 849  */
 850 static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv,
 851                                struct iw_cm_event *iw_event)
 852 {
 853         unsigned long flags;
 854         int ret;
 855
 856         spin_lock_irqsave(&cm_id_priv->lock, flags);
 857
 858         /*
 859          * We clear the CONNECT_WAIT bit here to allow the callback
 860          * function to call iw_cm_disconnect. Calling iw_destroy_cm_id
 861          * from a callback handler is not allowed.
 862          */
 863         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 864         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
 865         cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 866         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 867         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 868         wake_up_all(&cm_id_priv->connect_wait);
 869
 870         return ret;
 871 }
 872
 873 /*
 874  * Active Side: CM_ID <-- ESTABLISHED
 875  *
 876  * The app has called connect and is waiting for the established event to
 877  * post it's requests to the server. This event will wake up anyone
 878  * blocked in iw_cm_disconnect or iw_destroy_id.
 879  */
 880 static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv,
 881                                struct iw_cm_event *iw_event)
 882 {
 883         struct ib_qp *qp = NULL;
 884         unsigned long flags;
 885         int ret;
 886
 887         spin_lock_irqsave(&cm_id_priv->lock, flags);
 888         /*
 889          * Clear the connect wait bit so a callback function calling
 890          * iw_cm_disconnect will not wait and deadlock this thread
 891          */
 892         clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
 893         BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
 894         if (iw_event->status == 0) {
 895                 cm_id_priv->id.m_local_addr = iw_event->local_addr;
 896                 cm_id_priv->id.m_remote_addr = iw_event->remote_addr;
 897                 iw_event->local_addr = cm_id_priv->id.local_addr;
 898                 iw_event->remote_addr = cm_id_priv->id.remote_addr;
 899                 cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
 900         } else {
 901                 /* REJECTED or RESET */
 902                 qp = cm_id_priv->qp;
 903                 cm_id_priv->qp = NULL;
 904                 cm_id_priv->state = IW_CM_STATE_IDLE;
 905         }
 906         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 907         if (qp)
 908                 cm_id_priv->id.device->ops.iw_rem_ref(qp);
 909         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 910
 911         if (iw_event->private_data_len)
 912                 kfree(iw_event->private_data);
 913
 914         /* Wake up waiters on connect complete */
 915         wake_up_all(&cm_id_priv->connect_wait);
 916
 917         return ret;
 918 }
 919
 920 /*
 921  * CM_ID <-- CLOSING
 922  *
 923  * If in the ESTABLISHED state, move to CLOSING.
 924  */
 925 static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv,
 926                                   struct iw_cm_event *iw_event)
 927 {
 928         unsigned long flags;
 929
 930         spin_lock_irqsave(&cm_id_priv->lock, flags);
 931         if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
 932                 cm_id_priv->state = IW_CM_STATE_CLOSING;
 933         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 934 }
 935
 936 /*
 937  * CM_ID <-- IDLE
 938  *
 939  * If in the ESTBLISHED or CLOSING states, the QP will have have been
 940  * moved by the provider to the ERR state. Disassociate the CM_ID from
 941  * the QP,  move to IDLE, and remove the 'connected' reference.
 942  *
 943  * If in some other state, the cm_id was destroyed asynchronously.
 944  * This is the last reference that will result in waking up
 945  * the app thread blocked in iw_destroy_cm_id.
 946  */
 947 static int cm_close_handler(struct iwcm_id_private *cm_id_priv,
 948                                   struct iw_cm_event *iw_event)
 949 {
 950         struct ib_qp *qp;
 951         unsigned long flags;
 952         int ret = 0, notify_event = 0;
 953         spin_lock_irqsave(&cm_id_priv->lock, flags);
 954         qp = cm_id_priv->qp;
 955         cm_id_priv->qp = NULL;
 956
 957         switch (cm_id_priv->state) {
 958         case IW_CM_STATE_ESTABLISHED:
 959         case IW_CM_STATE_CLOSING:
 960                 cm_id_priv->state = IW_CM_STATE_IDLE;
 961                 notify_event = 1;
 962                 break;
 963         case IW_CM_STATE_DESTROYING:
 964                 break;
 965         default:
 966                 BUG();
 967         }
 968         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 969
 970         if (qp)
 971                 cm_id_priv->id.device->ops.iw_rem_ref(qp);
 972         if (notify_event)
 973                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
 974         return ret;
 975 }
 976
 977 static int process_event(struct iwcm_id_private *cm_id_priv,
 978                          struct iw_cm_event *iw_event)
 979 {
 980         int ret = 0;
 981
 982         switch (iw_event->event) {
 983         case IW_CM_EVENT_CONNECT_REQUEST:
 984                 cm_conn_req_handler(cm_id_priv, iw_event);
 985                 break;
 986         case IW_CM_EVENT_CONNECT_REPLY:
 987                 ret = cm_conn_rep_handler(cm_id_priv, iw_event);
 988                 break;
 989         case IW_CM_EVENT_ESTABLISHED:
 990                 ret = cm_conn_est_handler(cm_id_priv, iw_event);
 991                 break;
 992         case IW_CM_EVENT_DISCONNECT:
 993                 cm_disconnect_handler(cm_id_priv, iw_event);
 994                 break;
 995         case IW_CM_EVENT_CLOSE:
 996                 ret = cm_close_handler(cm_id_priv, iw_event);
 997                 break;
 998         default:
 999                 BUG();
1000         }
1001
1002         return ret;
1003 }
1004
1005 /*
1006  * Process events on the work_list for the cm_id. If the callback
1007  * function requests that the cm_id be deleted, a flag is set in the
1008  * cm_id flags to indicate that when the last reference is
1009  * removed, the cm_id is to be destroyed. This is necessary to
1010  * distinguish between an object that will be destroyed by the app
1011  * thread asleep on the destroy_comp list vs. an object destroyed
1012  * here synchronously when the last reference is removed.
1013  */
1014 static void cm_work_handler(struct work_struct *_work)
1015 {
1016         struct iwcm_work *work = container_of(_work, struct iwcm_work, work);
1017         struct iw_cm_event levent;
1018         struct iwcm_id_private *cm_id_priv = work->cm_id;
1019         unsigned long flags;
1020         int empty;
1021         int ret = 0;
1022
1023         spin_lock_irqsave(&cm_id_priv->lock, flags);
1024         empty = list_empty(&cm_id_priv->work_list);
1025         while (!empty) {
1026                 work = list_entry(cm_id_priv->work_list.next,
1027                                   struct iwcm_work, list);
1028                 list_del_init(&work->list);
1029                 empty = list_empty(&cm_id_priv->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                                 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                 if (empty)
1043                         return;
1044                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1045         }
1046         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1047 }
1048
1049 /*
1050  * This function is called on interrupt context. Schedule events on
1051  * the iwcm_wq thread to allow callback functions to downcall into
1052  * the CM and/or block.  Events are queued to a per-CM_ID
1053  * work_list. If this is the first event on the work_list, the work
1054  * element is also queued on the iwcm_wq thread.
1055  *
1056  * Each event holds a reference on the cm_id. Until the last posted
1057  * event has been delivered and processed, the cm_id cannot be
1058  * deleted.
1059  *
1060  * Returns:
1061  *            0 - the event was handled.
1062  *      -ENOMEM - the event was not handled due to lack of resources.
1063  */
1064 static int cm_event_handler(struct iw_cm_id *cm_id,
1065                              struct iw_cm_event *iw_event)
1066 {
1067         struct iwcm_work *work;
1068         struct iwcm_id_private *cm_id_priv;
1069         unsigned long flags;
1070         int ret = 0;
1071
1072         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1073
1074         spin_lock_irqsave(&cm_id_priv->lock, flags);
1075         work = get_work(cm_id_priv);
1076         if (!work) {
1077                 ret = -ENOMEM;
1078                 goto out;
1079         }
1080
1081         INIT_WORK(&work->work, cm_work_handler);
1082         work->cm_id = cm_id_priv;
1083         work->event = *iw_event;
1084
1085         if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST ||
1086              work->event.event == IW_CM_EVENT_CONNECT_REPLY) &&
1087             work->event.private_data_len) {
1088                 ret = copy_private_data(&work->event);
1089                 if (ret) {
1090                         put_work(work);
1091                         goto out;
1092                 }
1093         }
1094
1095         refcount_inc(&cm_id_priv->refcount);
1096         if (list_empty(&cm_id_priv->work_list)) {
1097                 list_add_tail(&work->list, &cm_id_priv->work_list);
1098                 queue_work(iwcm_wq, &work->work);
1099         } else
1100                 list_add_tail(&work->list, &cm_id_priv->work_list);
1101 out:
1102         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1103         return ret;
1104 }
1105
1106 static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv,
1107                                   struct ib_qp_attr *qp_attr,
1108                                   int *qp_attr_mask)
1109 {
1110         unsigned long flags;
1111         int ret;
1112
1113         spin_lock_irqsave(&cm_id_priv->lock, flags);
1114         switch (cm_id_priv->state) {
1115         case IW_CM_STATE_IDLE:
1116         case IW_CM_STATE_CONN_SENT:
1117         case IW_CM_STATE_CONN_RECV:
1118         case IW_CM_STATE_ESTABLISHED:
1119                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1120                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
1121                                            IB_ACCESS_REMOTE_READ;
1122                 ret = 0;
1123                 break;
1124         default:
1125                 ret = -EINVAL;
1126                 break;
1127         }
1128         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1129         return ret;
1130 }
1131
1132 static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
1133                                   struct ib_qp_attr *qp_attr,
1134                                   int *qp_attr_mask)
1135 {
1136         unsigned long flags;
1137         int ret;
1138
1139         spin_lock_irqsave(&cm_id_priv->lock, flags);
1140         switch (cm_id_priv->state) {
1141         case IW_CM_STATE_IDLE:
1142         case IW_CM_STATE_CONN_SENT:
1143         case IW_CM_STATE_CONN_RECV:
1144         case IW_CM_STATE_ESTABLISHED:
1145                 *qp_attr_mask = 0;
1146                 ret = 0;
1147                 break;
1148         default:
1149                 ret = -EINVAL;
1150                 break;
1151         }
1152         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1153         return ret;
1154 }
1155
1156 int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
1157                        struct ib_qp_attr *qp_attr,
1158                        int *qp_attr_mask)
1159 {
1160         struct iwcm_id_private *cm_id_priv;
1161         int ret;
1162
1163         cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1164         switch (qp_attr->qp_state) {
1165         case IB_QPS_INIT:
1166         case IB_QPS_RTR:
1167                 ret = iwcm_init_qp_init_attr(cm_id_priv,
1168                                              qp_attr, qp_attr_mask);
1169                 break;
1170         case IB_QPS_RTS:
1171                 ret = iwcm_init_qp_rts_attr(cm_id_priv,
1172                                             qp_attr, qp_attr_mask);
1173                 break;
1174         default:
1175                 ret = -EINVAL;
1176                 break;
1177         }
1178         return ret;
1179 }
1180 EXPORT_SYMBOL(iw_cm_init_qp_attr);
1181
1182 static int __init iw_cm_init(void)
1183 {
1184         int ret;
1185
1186         ret = iwpm_init(RDMA_NL_IWCM);
1187         if (ret)
1188                 return ret;
1189
1190         iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", 0);
1191         if (!iwcm_wq)
1192                 goto err_alloc;
1193
1194         iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm",
1195                                                  iwcm_ctl_table);
1196         if (!iwcm_ctl_table_hdr) {
1197                 pr_err("iw_cm: couldn't register sysctl paths\n");
1198                 goto err_sysctl;
1199         }
1200
1201         rdma_nl_register(RDMA_NL_IWCM, iwcm_nl_cb_table);
1202         return 0;
1203
1204 err_sysctl:
1205         destroy_workqueue(iwcm_wq);
1206 err_alloc:
1207         iwpm_exit(RDMA_NL_IWCM);
1208         return -ENOMEM;
1209 }
1210
1211 static void __exit iw_cm_cleanup(void)
1212 {
1213         rdma_nl_unregister(RDMA_NL_IWCM);
1214         unregister_net_sysctl_table(iwcm_ctl_table_hdr);
1215         destroy_workqueue(iwcm_wq);
1216         iwpm_exit(RDMA_NL_IWCM);
1217 }
1218
1219 MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2);
1220
1221 module_init(iw_cm_init);
1222 module_exit(iw_cm_cleanup);