1/*
  2 * Copyright (c) 2006, 2019 Oracle and/or its affiliates. All rights reserved.
  3 *
  4 * This software is available to you under a choice of one of two
  5 * licenses.  You may choose to be licensed under the terms of the GNU
  6 * General Public License (GPL) Version 2, available from the file
  7 * COPYING in the main directory of this source tree, or the
  8 * OpenIB.org BSD license below:
  9 *
 10 *     Redistribution and use in source and binary forms, with or
 11 *     without modification, are permitted provided that the following
 12 *     conditions are met:
 13 *
 14 *      - Redistributions of source code must retain the above
 15 *        copyright notice, this list of conditions and the following
 16 *        disclaimer.
 17 *
 18 *      - Redistributions in binary form must reproduce the above
 19 *        copyright notice, this list of conditions and the following
 20 *        disclaimer in the documentation and/or other materials
 21 *        provided with the distribution.
 22 *
 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 30 * SOFTWARE.
 31 *
 32 */
 33#include <linux/kernel.h>
 34#include <linux/in.h>
 35#include <linux/if.h>
 36#include <linux/netdevice.h>
 37#include <linux/inetdevice.h>
 38#include <linux/if_arp.h>
 39#include <linux/delay.h>
 40#include <linux/slab.h>
 41#include <linux/module.h>
 42#include <net/addrconf.h>
 43
 44#include "rds_single_path.h"
 45#include "rds.h"
 46#include "ib.h"
 47#include "ib_mr.h"
 48
 49static unsigned int rds_ib_mr_1m_pool_size = RDS_MR_1M_POOL_SIZE;
 50static unsigned int rds_ib_mr_8k_pool_size = RDS_MR_8K_POOL_SIZE;
 51unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
 52static atomic_t rds_ib_unloading;
 53
 54module_param(rds_ib_mr_1m_pool_size, int, 0444);
 55MODULE_PARM_DESC(rds_ib_mr_1m_pool_size, " Max number of 1M mr per HCA");
 56module_param(rds_ib_mr_8k_pool_size, int, 0444);
 57MODULE_PARM_DESC(rds_ib_mr_8k_pool_size, " Max number of 8K mr per HCA");
 58module_param(rds_ib_retry_count, int, 0444);
 59MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
 60
 61/*
 62 * we have a clumsy combination of RCU and a rwsem protecting this list
 63 * because it is used both in the get_mr fast path and while blocking in
 64 * the FMR flushing path.
 65 */
 66DECLARE_RWSEM(rds_ib_devices_lock);
 67struct list_head rds_ib_devices;
 68
 69/* NOTE: if also grabbing ibdev lock, grab this first */
 70DEFINE_SPINLOCK(ib_nodev_conns_lock);
 71LIST_HEAD(ib_nodev_conns);
 72
 73static void rds_ib_nodev_connect(void)
 74{
 75	struct rds_ib_connection *ic;
 76
 77	spin_lock(&ib_nodev_conns_lock);
 78	list_for_each_entry(ic, &ib_nodev_conns, ib_node)
 79		rds_conn_connect_if_down(ic->conn);
 80	spin_unlock(&ib_nodev_conns_lock);
 81}
 82
 83static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
 84{
 85	struct rds_ib_connection *ic;
 86	unsigned long flags;
 87
 88	spin_lock_irqsave(&rds_ibdev->spinlock, flags);
 89	list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node)
 90		rds_conn_path_drop(&ic->conn->c_path[0], true);
 91	spin_unlock_irqrestore(&rds_ibdev->spinlock, flags);
 92}
 93
 94/*
 95 * rds_ib_destroy_mr_pool() blocks on a few things and mrs drop references
 96 * from interrupt context so we push freing off into a work struct in krdsd.
 97 */
 98static void rds_ib_dev_free(struct work_struct *work)
 99{
100	struct rds_ib_ipaddr *i_ipaddr, *i_next;
101	struct rds_ib_device *rds_ibdev = container_of(work,
102					struct rds_ib_device, free_work);
103
104	if (rds_ibdev->mr_8k_pool)
105		rds_ib_destroy_mr_pool(rds_ibdev->mr_8k_pool);
106	if (rds_ibdev->mr_1m_pool)
107		rds_ib_destroy_mr_pool(rds_ibdev->mr_1m_pool);
108	if (rds_ibdev->pd)
109		ib_dealloc_pd(rds_ibdev->pd);
110
111	list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
112		list_del(&i_ipaddr->list);
113		kfree(i_ipaddr);
114	}
115
116	kfree(rds_ibdev->vector_load);
117
118	kfree(rds_ibdev);
119}
120
121void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
122{
123	BUG_ON(refcount_read(&rds_ibdev->refcount) == 0);
124	if (refcount_dec_and_test(&rds_ibdev->refcount))
125		queue_work(rds_wq, &rds_ibdev->free_work);
126}
127
128static int rds_ib_add_one(struct ib_device *device)
129{
130	struct rds_ib_device *rds_ibdev;
131	int ret;
132
133	/* Only handle IB (no iWARP) devices */
134	if (device->node_type != RDMA_NODE_IB_CA)
135		return -EOPNOTSUPP;
136
137	/* Device must support FRWR */
138	if (!(device->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
139		return -EOPNOTSUPP;
140
141	rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
142				 ibdev_to_node(device));
143	if (!rds_ibdev)
144		return -ENOMEM;
145
146	spin_lock_init(&rds_ibdev->spinlock);
147	refcount_set(&rds_ibdev->refcount, 1);
148	INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
149
150	INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
151	INIT_LIST_HEAD(&rds_ibdev->conn_list);
152
153	rds_ibdev->max_wrs = device->attrs.max_qp_wr;
154	rds_ibdev->max_sge = min(device->attrs.max_send_sge, RDS_IB_MAX_SGE);
155
156	rds_ibdev->odp_capable =
157		!!(device->attrs.kernel_cap_flags &
158		   IBK_ON_DEMAND_PAGING) &&
159		!!(device->attrs.odp_caps.per_transport_caps.rc_odp_caps &
160		   IB_ODP_SUPPORT_WRITE) &&
161		!!(device->attrs.odp_caps.per_transport_caps.rc_odp_caps &
162		   IB_ODP_SUPPORT_READ);
163
164	rds_ibdev->max_1m_mrs = device->attrs.max_mr ?
165		min_t(unsigned int, (device->attrs.max_mr / 2),
166		      rds_ib_mr_1m_pool_size) : rds_ib_mr_1m_pool_size;
167
168	rds_ibdev->max_8k_mrs = device->attrs.max_mr ?
169		min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE),
170		      rds_ib_mr_8k_pool_size) : rds_ib_mr_8k_pool_size;
171
172	rds_ibdev->max_initiator_depth = device->attrs.max_qp_init_rd_atom;
173	rds_ibdev->max_responder_resources = device->attrs.max_qp_rd_atom;
174
175	rds_ibdev->vector_load = kcalloc(device->num_comp_vectors,
176					 sizeof(int),
177					 GFP_KERNEL);
178	if (!rds_ibdev->vector_load) {
179		pr_err("RDS/IB: %s failed to allocate vector memory\n",
180			__func__);
181		ret = -ENOMEM;
182		goto put_dev;
183	}
184
185	rds_ibdev->dev = device;
186	rds_ibdev->pd = ib_alloc_pd(device, 0);
187	if (IS_ERR(rds_ibdev->pd)) {
188		ret = PTR_ERR(rds_ibdev->pd);
189		rds_ibdev->pd = NULL;
190		goto put_dev;
191	}
192
193	rds_ibdev->mr_1m_pool =
194		rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_1M_POOL);
195	if (IS_ERR(rds_ibdev->mr_1m_pool)) {
196		ret = PTR_ERR(rds_ibdev->mr_1m_pool);
197		rds_ibdev->mr_1m_pool = NULL;
198		goto put_dev;
199	}
200
201	rds_ibdev->mr_8k_pool =
202		rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_8K_POOL);
203	if (IS_ERR(rds_ibdev->mr_8k_pool)) {
204		ret = PTR_ERR(rds_ibdev->mr_8k_pool);
205		rds_ibdev->mr_8k_pool = NULL;
206		goto put_dev;
207	}
208
209	rdsdebug("RDS/IB: max_mr = %d, max_wrs = %d, max_sge = %d, max_1m_mrs = %d, max_8k_mrs = %d\n",
210		 device->attrs.max_mr, rds_ibdev->max_wrs, rds_ibdev->max_sge,
211		 rds_ibdev->max_1m_mrs, rds_ibdev->max_8k_mrs);
212
213	pr_info("RDS/IB: %s: added\n", device->name);
214
215	down_write(&rds_ib_devices_lock);
216	list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
217	up_write(&rds_ib_devices_lock);
218	refcount_inc(&rds_ibdev->refcount);
219
220	ib_set_client_data(device, &rds_ib_client, rds_ibdev);
221
222	rds_ib_nodev_connect();
223	return 0;
224
225put_dev:
226	rds_ib_dev_put(rds_ibdev);
227	return ret;
228}
229
230/*
231 * New connections use this to find the device to associate with the
232 * connection.  It's not in the fast path so we're not concerned about the
233 * performance of the IB call.  (As of this writing, it uses an interrupt
234 * blocking spinlock to serialize walking a per-device list of all registered
235 * clients.)
236 *
237 * RCU is used to handle incoming connections racing with device teardown.
238 * Rather than use a lock to serialize removal from the client_data and
239 * getting a new reference, we use an RCU grace period.  The destruction
240 * path removes the device from client_data and then waits for all RCU
241 * readers to finish.
242 *
243 * A new connection can get NULL from this if its arriving on a
244 * device that is in the process of being removed.
245 */
246struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
247{
248	struct rds_ib_device *rds_ibdev;
249
250	rcu_read_lock();
251	rds_ibdev = ib_get_client_data(device, &rds_ib_client);
252	if (rds_ibdev)
253		refcount_inc(&rds_ibdev->refcount);
254	rcu_read_unlock();
255	return rds_ibdev;
256}
257
258/*
259 * The IB stack is letting us know that a device is going away.  This can
260 * happen if the underlying HCA driver is removed or if PCI hotplug is removing
261 * the pci function, for example.
262 *
263 * This can be called at any time and can be racing with any other RDS path.
264 */
265static void rds_ib_remove_one(struct ib_device *device, void *client_data)
266{
267	struct rds_ib_device *rds_ibdev = client_data;
268
269	rds_ib_dev_shutdown(rds_ibdev);
270
271	/* stop connection attempts from getting a reference to this device. */
272	ib_set_client_data(device, &rds_ib_client, NULL);
273
274	down_write(&rds_ib_devices_lock);
275	list_del_rcu(&rds_ibdev->list);
276	up_write(&rds_ib_devices_lock);
277
278	/*
279	 * This synchronize rcu is waiting for readers of both the ib
280	 * client data and the devices list to finish before we drop
281	 * both of those references.
282	 */
283	synchronize_rcu();
284	rds_ib_dev_put(rds_ibdev);
285	rds_ib_dev_put(rds_ibdev);
286}
287
288struct ib_client rds_ib_client = {
289	.name   = "rds_ib",
290	.add    = rds_ib_add_one,
291	.remove = rds_ib_remove_one
292};
293
294static int rds_ib_conn_info_visitor(struct rds_connection *conn,
295				    void *buffer)
296{
297	struct rds_info_rdma_connection *iinfo = buffer;
298	struct rds_ib_connection *ic = conn->c_transport_data;
299
300	/* We will only ever look at IB transports */
301	if (conn->c_trans != &rds_ib_transport)
302		return 0;
303	if (conn->c_isv6)
304		return 0;
305
306	iinfo->src_addr = conn->c_laddr.s6_addr32[3];
307	iinfo->dst_addr = conn->c_faddr.s6_addr32[3];
308	if (ic) {
309		iinfo->tos = conn->c_tos;
310		iinfo->sl = ic->i_sl;
311	}
312
313	memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
314	memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
315	if (rds_conn_state(conn) == RDS_CONN_UP) {
316		struct rds_ib_device *rds_ibdev;
317
318		rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo->src_gid,
319			       (union ib_gid *)&iinfo->dst_gid);
320
321		rds_ibdev = ic->rds_ibdev;
322		iinfo->max_send_wr = ic->i_send_ring.w_nr;
323		iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
324		iinfo->max_send_sge = rds_ibdev->max_sge;
325		rds_ib_get_mr_info(rds_ibdev, iinfo);
326		iinfo->cache_allocs = atomic_read(&ic->i_cache_allocs);
327	}
328	return 1;
329}
330
331#if IS_ENABLED(CONFIG_IPV6)
332/* IPv6 version of rds_ib_conn_info_visitor(). */
333static int rds6_ib_conn_info_visitor(struct rds_connection *conn,
334				     void *buffer)
335{
336	struct rds6_info_rdma_connection *iinfo6 = buffer;
337	struct rds_ib_connection *ic = conn->c_transport_data;
338
339	/* We will only ever look at IB transports */
340	if (conn->c_trans != &rds_ib_transport)
341		return 0;
342
343	iinfo6->src_addr = conn->c_laddr;
344	iinfo6->dst_addr = conn->c_faddr;
345	if (ic) {
346		iinfo6->tos = conn->c_tos;
347		iinfo6->sl = ic->i_sl;
348	}
349
350	memset(&iinfo6->src_gid, 0, sizeof(iinfo6->src_gid));
351	memset(&iinfo6->dst_gid, 0, sizeof(iinfo6->dst_gid));
352
353	if (rds_conn_state(conn) == RDS_CONN_UP) {
354		struct rds_ib_device *rds_ibdev;
355
356		rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo6->src_gid,
357			       (union ib_gid *)&iinfo6->dst_gid);
358		rds_ibdev = ic->rds_ibdev;
359		iinfo6->max_send_wr = ic->i_send_ring.w_nr;
360		iinfo6->max_recv_wr = ic->i_recv_ring.w_nr;
361		iinfo6->max_send_sge = rds_ibdev->max_sge;
362		rds6_ib_get_mr_info(rds_ibdev, iinfo6);
363		iinfo6->cache_allocs = atomic_read(&ic->i_cache_allocs);
364	}
365	return 1;
366}
367#endif
368
369static void rds_ib_ic_info(struct socket *sock, unsigned int len,
370			   struct rds_info_iterator *iter,
371			   struct rds_info_lengths *lens)
372{
373	u64 buffer[(sizeof(struct rds_info_rdma_connection) + 7) / 8];
374
375	rds_for_each_conn_info(sock, len, iter, lens,
376				rds_ib_conn_info_visitor,
377				buffer,
378				sizeof(struct rds_info_rdma_connection));
379}
380
381#if IS_ENABLED(CONFIG_IPV6)
382/* IPv6 version of rds_ib_ic_info(). */
383static void rds6_ib_ic_info(struct socket *sock, unsigned int len,
384			    struct rds_info_iterator *iter,
385			    struct rds_info_lengths *lens)
386{
387	u64 buffer[(sizeof(struct rds6_info_rdma_connection) + 7) / 8];
388
389	rds_for_each_conn_info(sock, len, iter, lens,
390			       rds6_ib_conn_info_visitor,
391			       buffer,
392			       sizeof(struct rds6_info_rdma_connection));
393}
394#endif
395
396/*
397 * Early RDS/IB was built to only bind to an address if there is an IPoIB
398 * device with that address set.
399 *
400 * If it were me, I'd advocate for something more flexible.  Sending and
401 * receiving should be device-agnostic.  Transports would try and maintain
402 * connections between peers who have messages queued.  Userspace would be
403 * allowed to influence which paths have priority.  We could call userspace
404 * asserting this policy "routing".
405 */
406static int rds_ib_laddr_check(struct net *net, const struct in6_addr *addr,
407			      __u32 scope_id)
408{
409	int ret;
410	struct rdma_cm_id *cm_id;
411#if IS_ENABLED(CONFIG_IPV6)
412	struct sockaddr_in6 sin6;
413#endif
414	struct sockaddr_in sin;
415	struct sockaddr *sa;
416	bool isv4;
417
418	isv4 = ipv6_addr_v4mapped(addr);
419	/* Create a CMA ID and try to bind it. This catches both
420	 * IB and iWARP capable NICs.
421	 */
422	cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler,
423			       NULL, RDMA_PS_TCP, IB_QPT_RC);
424	if (IS_ERR(cm_id))
425		return PTR_ERR(cm_id);
426
427	if (isv4) {
428		memset(&sin, 0, sizeof(sin));
429		sin.sin_family = AF_INET;
430		sin.sin_addr.s_addr = addr->s6_addr32[3];
431		sa = (struct sockaddr *)&sin;
432	} else {
433#if IS_ENABLED(CONFIG_IPV6)
434		memset(&sin6, 0, sizeof(sin6));
435		sin6.sin6_family = AF_INET6;
436		sin6.sin6_addr = *addr;
437		sin6.sin6_scope_id = scope_id;
438		sa = (struct sockaddr *)&sin6;
439
440		/* XXX Do a special IPv6 link local address check here.  The
441		 * reason is that rdma_bind_addr() always succeeds with IPv6
442		 * link local address regardless it is indeed configured in a
443		 * system.
444		 */
445		if (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL) {
446			struct net_device *dev;
447
448			if (scope_id == 0) {
449				ret = -EADDRNOTAVAIL;
450				goto out;
451			}
452
453			/* Use init_net for now as RDS is not network
454			 * name space aware.
455			 */
456			dev = dev_get_by_index(&init_net, scope_id);
457			if (!dev) {
458				ret = -EADDRNOTAVAIL;
459				goto out;
460			}
461			if (!ipv6_chk_addr(&init_net, addr, dev, 1)) {
462				dev_put(dev);
463				ret = -EADDRNOTAVAIL;
464				goto out;
465			}
466			dev_put(dev);
467		}
468#else
469		ret = -EADDRNOTAVAIL;
470		goto out;
471#endif
472	}
473
474	/* rdma_bind_addr will only succeed for IB & iWARP devices */
475	ret = rdma_bind_addr(cm_id, sa);
476	/* due to this, we will claim to support iWARP devices unless we
477	   check node_type. */
478	if (ret || !cm_id->device ||
479	    cm_id->device->node_type != RDMA_NODE_IB_CA)
480		ret = -EADDRNOTAVAIL;
481
482	rdsdebug("addr %pI6c%%%u ret %d node type %d\n",
483		 addr, scope_id, ret,
484		 cm_id->device ? cm_id->device->node_type : -1);
485
486out:
487	rdma_destroy_id(cm_id);
488
489	return ret;
490}
491
492static void rds_ib_unregister_client(void)
493{
494	ib_unregister_client(&rds_ib_client);
495	/* wait for rds_ib_dev_free() to complete */
496	flush_workqueue(rds_wq);
497}
498
499static void rds_ib_set_unloading(void)
500{
501	atomic_set(&rds_ib_unloading, 1);
502}
503
504static bool rds_ib_is_unloading(struct rds_connection *conn)
505{
506	struct rds_conn_path *cp = &conn->c_path[0];
507
508	return (test_bit(RDS_DESTROY_PENDING, &cp->cp_flags) ||
509		atomic_read(&rds_ib_unloading) != 0);
510}
511
512void rds_ib_exit(void)
513{
514	rds_ib_set_unloading();
515	synchronize_rcu();
516	rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
517#if IS_ENABLED(CONFIG_IPV6)
518	rds_info_deregister_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info);
519#endif
520	rds_ib_unregister_client();
521	rds_ib_destroy_nodev_conns();
522	rds_ib_sysctl_exit();
523	rds_ib_recv_exit();
524	rds_trans_unregister(&rds_ib_transport);
525	rds_ib_mr_exit();
526}
527
528static u8 rds_ib_get_tos_map(u8 tos)
529{
530	/* 1:1 user to transport map for RDMA transport.
531	 * In future, if custom map is desired, hook can export
532	 * user configurable map.
533	 */
534	return tos;
535}
536
537struct rds_transport rds_ib_transport = {
538	.laddr_check		= rds_ib_laddr_check,
539	.xmit_path_complete	= rds_ib_xmit_path_complete,
540	.xmit			= rds_ib_xmit,
541	.xmit_rdma		= rds_ib_xmit_rdma,
542	.xmit_atomic		= rds_ib_xmit_atomic,
543	.recv_path		= rds_ib_recv_path,
544	.conn_alloc		= rds_ib_conn_alloc,
545	.conn_free		= rds_ib_conn_free,
546	.conn_path_connect	= rds_ib_conn_path_connect,
547	.conn_path_shutdown	= rds_ib_conn_path_shutdown,
548	.inc_copy_to_user	= rds_ib_inc_copy_to_user,
549	.inc_free		= rds_ib_inc_free,
550	.cm_initiate_connect	= rds_ib_cm_initiate_connect,
551	.cm_handle_connect	= rds_ib_cm_handle_connect,
552	.cm_connect_complete	= rds_ib_cm_connect_complete,
553	.stats_info_copy	= rds_ib_stats_info_copy,
554	.exit			= rds_ib_exit,
555	.get_mr			= rds_ib_get_mr,
556	.sync_mr		= rds_ib_sync_mr,
557	.free_mr		= rds_ib_free_mr,
558	.flush_mrs		= rds_ib_flush_mrs,
559	.get_tos_map		= rds_ib_get_tos_map,
560	.t_owner		= THIS_MODULE,
561	.t_name			= "infiniband",
562	.t_unloading		= rds_ib_is_unloading,
563	.t_type			= RDS_TRANS_IB
564};
565
566int rds_ib_init(void)
567{
568	int ret;
569
570	INIT_LIST_HEAD(&rds_ib_devices);
571
572	ret = rds_ib_mr_init();
573	if (ret)
574		goto out;
575
576	ret = ib_register_client(&rds_ib_client);
577	if (ret)
578		goto out_mr_exit;
579
580	ret = rds_ib_sysctl_init();
581	if (ret)
582		goto out_ibreg;
583
584	ret = rds_ib_recv_init();
585	if (ret)
586		goto out_sysctl;
587
588	rds_trans_register(&rds_ib_transport);
589
590	rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
591#if IS_ENABLED(CONFIG_IPV6)
592	rds_info_register_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info);
593#endif
594
595	goto out;
596
597out_sysctl:
598	rds_ib_sysctl_exit();
599out_ibreg:
600	rds_ib_unregister_client();
601out_mr_exit:
602	rds_ib_mr_exit();
603out:
604	return ret;
605}
606
607MODULE_LICENSE("GPL");