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
  58MODULE_AUTHOR("Tom Tucker");
  59MODULE_DESCRIPTION("iWARP CM");
  60MODULE_LICENSE("Dual BSD/GPL");
  61
  62static 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
  68const 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}
  81EXPORT_SYMBOL(iwcm_reject_msg);
  82
  83static 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
  94static struct workqueue_struct *iwcm_wq;
  95struct iwcm_work {
  96	struct work_struct work;
  97	struct iwcm_id_private *cm_id;
  98	struct iw_cm_event event;
  99	struct list_head free_list;
 100};
 101
 102static unsigned int default_backlog = 256;
 103
 104static struct ctl_table_header *iwcm_ctl_table_hdr;
 105static struct ctl_table iwcm_ctl_table[] = {
 106	{
 107		.procname	= "default_backlog",
 108		.data		= &default_backlog,
 109		.maxlen		= sizeof(default_backlog),
 110		.mode		= 0644,
 111		.proc_handler	= proc_dointvec_minmax,
 112		.extra1		= SYSCTL_ZERO,
 113		.extra2		= SYSCTL_INT_MAX,
 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
 141static 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_first_entry(&cm_id_priv->work_free_list, struct iwcm_work,
 148				free_list);
 149	list_del_init(&work->free_list);
 150	return work;
 151}
 152
 153static void put_work(struct iwcm_work *work)
 154{
 155	list_add(&work->free_list, &work->cm_id->work_free_list);
 156}
 157
 158static 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
 168static 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		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 */
 190static 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
 201static void free_cm_id(struct iwcm_id_private *cm_id_priv)
 202{
 203	dealloc_work_entries(cm_id_priv);
 204	kfree(cm_id_priv);
 205}
 206
 207/*
 208 * Release a reference on cm_id. If the last reference is being
 209 * released, free the cm_id and return 'true'.
 210 */
 211static bool iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
 212{
 213	if (refcount_dec_and_test(&cm_id_priv->refcount)) {
 214		free_cm_id(cm_id_priv);
 215		return true;
 216	}
 217
 218	return false;
 219}
 220
 221static void add_ref(struct iw_cm_id *cm_id)
 222{
 223	struct iwcm_id_private *cm_id_priv;
 224	cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 225	refcount_inc(&cm_id_priv->refcount);
 226}
 227
 228static void rem_ref(struct iw_cm_id *cm_id)
 229{
 230	struct iwcm_id_private *cm_id_priv;
 231
 232	cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 233
 234	(void)iwcm_deref_id(cm_id_priv);
 235}
 236
 237static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event);
 238
 239struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
 240				 iw_cm_handler cm_handler,
 241				 void *context)
 242{
 243	struct iwcm_id_private *cm_id_priv;
 244
 245	cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL);
 246	if (!cm_id_priv)
 247		return ERR_PTR(-ENOMEM);
 248
 249	cm_id_priv->state = IW_CM_STATE_IDLE;
 250	cm_id_priv->id.device = device;
 251	cm_id_priv->id.cm_handler = cm_handler;
 252	cm_id_priv->id.context = context;
 253	cm_id_priv->id.event_handler = cm_event_handler;
 254	cm_id_priv->id.add_ref = add_ref;
 255	cm_id_priv->id.rem_ref = rem_ref;
 256	spin_lock_init(&cm_id_priv->lock);
 257	refcount_set(&cm_id_priv->refcount, 1);
 258	init_waitqueue_head(&cm_id_priv->connect_wait);
 259	init_completion(&cm_id_priv->destroy_comp);
 260	INIT_LIST_HEAD(&cm_id_priv->work_free_list);
 261
 262	return &cm_id_priv->id;
 263}
 264EXPORT_SYMBOL(iw_create_cm_id);
 265
 266
 267static int iwcm_modify_qp_err(struct ib_qp *qp)
 268{
 269	struct ib_qp_attr qp_attr;
 270
 271	if (!qp)
 272		return -EINVAL;
 273
 274	qp_attr.qp_state = IB_QPS_ERR;
 275	return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 276}
 277
 278/*
 279 * This is really the RDMAC CLOSING state. It is most similar to the
 280 * IB SQD QP state.
 281 */
 282static int iwcm_modify_qp_sqd(struct ib_qp *qp)
 283{
 284	struct ib_qp_attr qp_attr;
 285
 286	BUG_ON(qp == NULL);
 287	qp_attr.qp_state = IB_QPS_SQD;
 288	return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 289}
 290
 291/*
 292 * CM_ID <-- CLOSING
 293 *
 294 * Block if a passive or active connection is currently being processed. Then
 295 * process the event as follows:
 296 * - If we are ESTABLISHED, move to CLOSING and modify the QP state
 297 *   based on the abrupt flag
 298 * - If the connection is already in the CLOSING or IDLE state, the peer is
 299 *   disconnecting concurrently with us and we've already seen the
 300 *   DISCONNECT event -- ignore the request and return 0
 301 * - Disconnect on a listening endpoint returns -EINVAL
 302 */
 303int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt)
 304{
 305	struct iwcm_id_private *cm_id_priv;
 306	unsigned long flags;
 307	int ret = 0;
 308	struct ib_qp *qp = NULL;
 309
 310	cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 311	/* Wait if we're currently in a connect or accept downcall */
 312	wait_event(cm_id_priv->connect_wait,
 313		   !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 314
 315	spin_lock_irqsave(&cm_id_priv->lock, flags);
 316	switch (cm_id_priv->state) {
 317	case IW_CM_STATE_ESTABLISHED:
 318		cm_id_priv->state = IW_CM_STATE_CLOSING;
 319
 320		/* QP could be <nul> for user-mode client */
 321		if (cm_id_priv->qp)
 322			qp = cm_id_priv->qp;
 323		else
 324			ret = -EINVAL;
 325		break;
 326	case IW_CM_STATE_LISTEN:
 327		ret = -EINVAL;
 328		break;
 329	case IW_CM_STATE_CLOSING:
 330		/* remote peer closed first */
 331	case IW_CM_STATE_IDLE:
 332		/* accept or connect returned !0 */
 333		break;
 334	case IW_CM_STATE_CONN_RECV:
 335		/*
 336		 * App called disconnect before/without calling accept after
 337		 * connect_request event delivered.
 338		 */
 339		break;
 340	case IW_CM_STATE_CONN_SENT:
 341		/* Can only get here if wait above fails */
 342	default:
 343		BUG();
 344	}
 345	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 346
 347	if (qp) {
 348		if (abrupt)
 349			ret = iwcm_modify_qp_err(qp);
 350		else
 351			ret = iwcm_modify_qp_sqd(qp);
 352
 353		/*
 354		 * If both sides are disconnecting the QP could
 355		 * already be in ERR or SQD states
 356		 */
 357		ret = 0;
 358	}
 359
 360	return ret;
 361}
 362EXPORT_SYMBOL(iw_cm_disconnect);
 363
 364/*
 365 * CM_ID <-- DESTROYING
 366 *
 367 * Clean up all resources associated with the connection.
 368 */
 369static void destroy_cm_id(struct iw_cm_id *cm_id)
 370{
 371	struct iwcm_id_private *cm_id_priv;
 372	struct ib_qp *qp;
 373	unsigned long flags;
 374
 375	cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 376	/*
 377	 * Wait if we're currently in a connect or accept downcall. A
 378	 * listening endpoint should never block here.
 379	 */
 380	wait_event(cm_id_priv->connect_wait,
 381		   !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 382
 383	/*
 384	 * Since we're deleting the cm_id, drop any events that
 385	 * might arrive before the last dereference.
 386	 */
 387	set_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags);
 388
 389	spin_lock_irqsave(&cm_id_priv->lock, flags);
 390	qp = cm_id_priv->qp;
 391	cm_id_priv->qp = NULL;
 392
 393	switch (cm_id_priv->state) {
 394	case IW_CM_STATE_LISTEN:
 395		cm_id_priv->state = IW_CM_STATE_DESTROYING;
 396		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 397		/* destroy the listening endpoint */
 398		cm_id->device->ops.iw_destroy_listen(cm_id);
 399		spin_lock_irqsave(&cm_id_priv->lock, flags);
 400		break;
 401	case IW_CM_STATE_ESTABLISHED:
 402		cm_id_priv->state = IW_CM_STATE_DESTROYING;
 403		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 404		/* Abrupt close of the connection */
 405		(void)iwcm_modify_qp_err(qp);
 406		spin_lock_irqsave(&cm_id_priv->lock, flags);
 407		break;
 408	case IW_CM_STATE_IDLE:
 409	case IW_CM_STATE_CLOSING:
 410		cm_id_priv->state = IW_CM_STATE_DESTROYING;
 411		break;
 412	case IW_CM_STATE_CONN_RECV:
 413		/*
 414		 * App called destroy before/without calling accept after
 415		 * receiving connection request event notification or
 416		 * returned non zero from the event callback function.
 417		 * In either case, must tell the provider to reject.
 418		 */
 419		cm_id_priv->state = IW_CM_STATE_DESTROYING;
 420		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 421		cm_id->device->ops.iw_reject(cm_id, NULL, 0);
 422		spin_lock_irqsave(&cm_id_priv->lock, flags);
 423		break;
 424	case IW_CM_STATE_CONN_SENT:
 425	case IW_CM_STATE_DESTROYING:
 426	default:
 427		BUG();
 428		break;
 429	}
 430	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 431	if (qp)
 432		cm_id_priv->id.device->ops.iw_rem_ref(qp);
 433
 434	if (cm_id->mapped) {
 435		iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr);
 436		iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM);
 437	}
 438}
 439
 440/*
 441 * Destroy cm_id. If the cm_id still has other references, wait for all
 442 * references to be released on the cm_id and then release the initial
 443 * reference taken by iw_create_cm_id.
 444 */
 445void iw_destroy_cm_id(struct iw_cm_id *cm_id)
 446{
 447	struct iwcm_id_private *cm_id_priv;
 448
 449	cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 450	destroy_cm_id(cm_id);
 451	if (refcount_read(&cm_id_priv->refcount) > 1)
 452		flush_workqueue(iwcm_wq);
 453	iwcm_deref_id(cm_id_priv);
 454}
 455EXPORT_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 */
 466static 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 */
 506static 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 */
 560int 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}
 595EXPORT_SYMBOL(iw_cm_listen);
 596
 597/*
 598 * CM_ID <-- IDLE
 599 *
 600 * Rejects an inbound connection request. No events are generated.
 601 */
 602int 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}
 631EXPORT_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 */
 640int 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}
 687EXPORT_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 */
 696int 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;
 738err:
 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}
 746EXPORT_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 */
 763static 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
 833out:
 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 */
 850static 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 */
 880static 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 */
 925static 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 */
 947static 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
 977static 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 for the cm_id. If the callback function requests
1007 * that the cm_id be deleted, a flag is set in the cm_id flags to
1008 * indicate that when the last reference is removed, the cm_id is
1009 * to be destroyed. This is necessary to distinguish between an
1010 * object that will be destroyed by the app thread asleep on the
1011 * destroy_comp list vs. an object destroyed here synchronously
1012 * when the last reference is removed.
1013 */
1014static 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 ret = 0;
1021
1022	spin_lock_irqsave(&cm_id_priv->lock, flags);
1023	levent = work->event;
1024	put_work(work);
1025	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1026
1027	if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) {
1028		ret = process_event(cm_id_priv, &levent);
1029		if (ret) {
1030			destroy_cm_id(&cm_id_priv->id);
1031			WARN_ON_ONCE(iwcm_deref_id(cm_id_priv));
1032		}
1033	} else
1034		pr_debug("dropping event %d\n", levent.event);
1035	if (iwcm_deref_id(cm_id_priv))
1036		return;
1037}
1038
1039/*
1040 * This function is called on interrupt context. Schedule events on
1041 * the iwcm_wq thread to allow callback functions to downcall into
1042 * the CM and/or block.
1043 *
1044 * Each event holds a reference on the cm_id. Until the last posted
1045 * event has been delivered and processed, the cm_id cannot be
1046 * deleted.
1047 *
1048 * Returns:
1049 * 	      0	- the event was handled.
1050 *	-ENOMEM	- the event was not handled due to lack of resources.
1051 */
1052static int cm_event_handler(struct iw_cm_id *cm_id,
1053			     struct iw_cm_event *iw_event)
1054{
1055	struct iwcm_work *work;
1056	struct iwcm_id_private *cm_id_priv;
1057	unsigned long flags;
1058	int ret = 0;
1059
1060	cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1061
1062	spin_lock_irqsave(&cm_id_priv->lock, flags);
1063	work = get_work(cm_id_priv);
1064	if (!work) {
1065		ret = -ENOMEM;
1066		goto out;
1067	}
1068
1069	INIT_WORK(&work->work, cm_work_handler);
1070	work->cm_id = cm_id_priv;
1071	work->event = *iw_event;
1072
1073	if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST ||
1074	     work->event.event == IW_CM_EVENT_CONNECT_REPLY) &&
1075	    work->event.private_data_len) {
1076		ret = copy_private_data(&work->event);
1077		if (ret) {
1078			put_work(work);
1079			goto out;
1080		}
1081	}
1082
1083	refcount_inc(&cm_id_priv->refcount);
1084	queue_work(iwcm_wq, &work->work);
1085out:
1086	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1087	return ret;
1088}
1089
1090static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv,
1091				  struct ib_qp_attr *qp_attr,
1092				  int *qp_attr_mask)
1093{
1094	unsigned long flags;
1095	int ret;
1096
1097	spin_lock_irqsave(&cm_id_priv->lock, flags);
1098	switch (cm_id_priv->state) {
1099	case IW_CM_STATE_IDLE:
1100	case IW_CM_STATE_CONN_SENT:
1101	case IW_CM_STATE_CONN_RECV:
1102	case IW_CM_STATE_ESTABLISHED:
1103		*qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1104		qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
1105					   IB_ACCESS_REMOTE_READ;
1106		ret = 0;
1107		break;
1108	default:
1109		ret = -EINVAL;
1110		break;
1111	}
1112	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1113	return ret;
1114}
1115
1116static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
1117				  struct ib_qp_attr *qp_attr,
1118				  int *qp_attr_mask)
1119{
1120	unsigned long flags;
1121	int ret;
1122
1123	spin_lock_irqsave(&cm_id_priv->lock, flags);
1124	switch (cm_id_priv->state) {
1125	case IW_CM_STATE_IDLE:
1126	case IW_CM_STATE_CONN_SENT:
1127	case IW_CM_STATE_CONN_RECV:
1128	case IW_CM_STATE_ESTABLISHED:
1129		*qp_attr_mask = 0;
1130		ret = 0;
1131		break;
1132	default:
1133		ret = -EINVAL;
1134		break;
1135	}
1136	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1137	return ret;
1138}
1139
1140int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
1141		       struct ib_qp_attr *qp_attr,
1142		       int *qp_attr_mask)
1143{
1144	struct iwcm_id_private *cm_id_priv;
1145	int ret;
1146
1147	cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1148	switch (qp_attr->qp_state) {
1149	case IB_QPS_INIT:
1150	case IB_QPS_RTR:
1151		ret = iwcm_init_qp_init_attr(cm_id_priv,
1152					     qp_attr, qp_attr_mask);
1153		break;
1154	case IB_QPS_RTS:
1155		ret = iwcm_init_qp_rts_attr(cm_id_priv,
1156					    qp_attr, qp_attr_mask);
1157		break;
1158	default:
1159		ret = -EINVAL;
1160		break;
1161	}
1162	return ret;
1163}
1164EXPORT_SYMBOL(iw_cm_init_qp_attr);
1165
1166static int __init iw_cm_init(void)
1167{
1168	int ret;
1169
1170	ret = iwpm_init(RDMA_NL_IWCM);
1171	if (ret)
1172		return ret;
1173
1174	iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", WQ_MEM_RECLAIM);
1175	if (!iwcm_wq)
1176		goto err_alloc;
1177
1178	iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm",
1179						 iwcm_ctl_table);
1180	if (!iwcm_ctl_table_hdr) {
1181		pr_err("iw_cm: couldn't register sysctl paths\n");
1182		goto err_sysctl;
1183	}
1184
1185	rdma_nl_register(RDMA_NL_IWCM, iwcm_nl_cb_table);
1186	return 0;
1187
1188err_sysctl:
1189	destroy_workqueue(iwcm_wq);
1190err_alloc:
1191	iwpm_exit(RDMA_NL_IWCM);
1192	return -ENOMEM;
1193}
1194
1195static void __exit iw_cm_cleanup(void)
1196{
1197	rdma_nl_unregister(RDMA_NL_IWCM);
1198	unregister_net_sysctl_table(iwcm_ctl_table_hdr);
1199	destroy_workqueue(iwcm_wq);
1200	iwpm_exit(RDMA_NL_IWCM);
1201}
1202
1203MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2);
1204
1205module_init(iw_cm_init);
1206module_exit(iw_cm_cleanup);