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 list_head list;
  99	struct iw_cm_event event;
 100	struct list_head free_list;
 101};
 102
 103static unsigned int default_backlog = 256;
 104
 105static struct ctl_table_header *iwcm_ctl_table_hdr;
 106static 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
 140static 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
 152static void put_work(struct iwcm_work *work)
 153{
 154	list_add(&work->free_list, &work->cm_id->work_free_list);
 155}
 156
 157static 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
 167static 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 */
 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 1.
 210 */
 211static 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
 222static 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
 229static 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
 238static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event);
 239
 240struct 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}
 266EXPORT_SYMBOL(iw_create_cm_id);
 267
 268
 269static 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 */
 284static 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 */
 305int 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}
 364EXPORT_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 */
 372static 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 */
 451void iw_destroy_cm_id(struct iw_cm_id *cm_id)
 452{
 453	destroy_cm_id(cm_id);
 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 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 */
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 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 */
1064static 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);
1101out:
1102	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1103	return ret;
1104}
1105
1106static 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
1132static 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
1156int 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}
1180EXPORT_SYMBOL(iw_cm_init_qp_attr);
1181
1182static 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
1204err_sysctl:
1205	destroy_workqueue(iwcm_wq);
1206err_alloc:
1207	iwpm_exit(RDMA_NL_IWCM);
1208	return -ENOMEM;
1209}
1210
1211static 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
1219MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2);
1220
1221module_init(iw_cm_init);
1222module_exit(iw_cm_cleanup);