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/net/rds/ib.c

http://github.com/mirrors/linux
C | 618 lines | 425 code | 88 blank | 105 comment | 45 complexity | 48e7bc19a07bfccf8cb65ddbe359c04f MD5 | raw file
  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/dmapool.h>
 34#include <linux/kernel.h>
 35#include <linux/in.h>
 36#include <linux/if.h>
 37#include <linux/netdevice.h>
 38#include <linux/inetdevice.h>
 39#include <linux/if_arp.h>
 40#include <linux/delay.h>
 41#include <linux/slab.h>
 42#include <linux/module.h>
 43#include <net/addrconf.h>
 44
 45#include "rds_single_path.h"
 46#include "rds.h"
 47#include "ib.h"
 48#include "ib_mr.h"
 49
 50static unsigned int rds_ib_mr_1m_pool_size = RDS_MR_1M_POOL_SIZE;
 51static unsigned int rds_ib_mr_8k_pool_size = RDS_MR_8K_POOL_SIZE;
 52unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
 53static atomic_t rds_ib_unloading;
 54
 55module_param(rds_ib_mr_1m_pool_size, int, 0444);
 56MODULE_PARM_DESC(rds_ib_mr_1m_pool_size, " Max number of 1M mr per HCA");
 57module_param(rds_ib_mr_8k_pool_size, int, 0444);
 58MODULE_PARM_DESC(rds_ib_mr_8k_pool_size, " Max number of 8K mr per HCA");
 59module_param(rds_ib_retry_count, int, 0444);
 60MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
 61
 62/*
 63 * we have a clumsy combination of RCU and a rwsem protecting this list
 64 * because it is used both in the get_mr fast path and while blocking in
 65 * the FMR flushing path.
 66 */
 67DECLARE_RWSEM(rds_ib_devices_lock);
 68struct list_head rds_ib_devices;
 69
 70/* NOTE: if also grabbing ibdev lock, grab this first */
 71DEFINE_SPINLOCK(ib_nodev_conns_lock);
 72LIST_HEAD(ib_nodev_conns);
 73
 74static void rds_ib_nodev_connect(void)
 75{
 76	struct rds_ib_connection *ic;
 77
 78	spin_lock(&ib_nodev_conns_lock);
 79	list_for_each_entry(ic, &ib_nodev_conns, ib_node)
 80		rds_conn_connect_if_down(ic->conn);
 81	spin_unlock(&ib_nodev_conns_lock);
 82}
 83
 84static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
 85{
 86	struct rds_ib_connection *ic;
 87	unsigned long flags;
 88
 89	spin_lock_irqsave(&rds_ibdev->spinlock, flags);
 90	list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node)
 91		rds_conn_path_drop(&ic->conn->c_path[0], true);
 92	spin_unlock_irqrestore(&rds_ibdev->spinlock, flags);
 93}
 94
 95/*
 96 * rds_ib_destroy_mr_pool() blocks on a few things and mrs drop references
 97 * from interrupt context so we push freing off into a work struct in krdsd.
 98 */
 99static void rds_ib_dev_free(struct work_struct *work)
100{
101	struct rds_ib_ipaddr *i_ipaddr, *i_next;
102	struct rds_ib_device *rds_ibdev = container_of(work,
103					struct rds_ib_device, free_work);
104
105	if (rds_ibdev->mr_8k_pool)
106		rds_ib_destroy_mr_pool(rds_ibdev->mr_8k_pool);
107	if (rds_ibdev->mr_1m_pool)
108		rds_ib_destroy_mr_pool(rds_ibdev->mr_1m_pool);
109	if (rds_ibdev->pd)
110		ib_dealloc_pd(rds_ibdev->pd);
111	dma_pool_destroy(rds_ibdev->rid_hdrs_pool);
112
113	list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
114		list_del(&i_ipaddr->list);
115		kfree(i_ipaddr);
116	}
117
118	kfree(rds_ibdev->vector_load);
119
120	kfree(rds_ibdev);
121}
122
123void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
124{
125	BUG_ON(refcount_read(&rds_ibdev->refcount) == 0);
126	if (refcount_dec_and_test(&rds_ibdev->refcount))
127		queue_work(rds_wq, &rds_ibdev->free_work);
128}
129
130static void rds_ib_add_one(struct ib_device *device)
131{
132	struct rds_ib_device *rds_ibdev;
133	bool has_fr, has_fmr;
134
135	/* Only handle IB (no iWARP) devices */
136	if (device->node_type != RDMA_NODE_IB_CA)
137		return;
138
139	rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
140				 ibdev_to_node(device));
141	if (!rds_ibdev)
142		return;
143
144	spin_lock_init(&rds_ibdev->spinlock);
145	refcount_set(&rds_ibdev->refcount, 1);
146	INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
147
148	INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
149	INIT_LIST_HEAD(&rds_ibdev->conn_list);
150
151	rds_ibdev->max_wrs = device->attrs.max_qp_wr;
152	rds_ibdev->max_sge = min(device->attrs.max_send_sge, RDS_IB_MAX_SGE);
153
154	has_fr = (device->attrs.device_cap_flags &
155		  IB_DEVICE_MEM_MGT_EXTENSIONS);
156	has_fmr = (device->ops.alloc_fmr && device->ops.dealloc_fmr &&
157		   device->ops.map_phys_fmr && device->ops.unmap_fmr);
158	rds_ibdev->use_fastreg = (has_fr && !has_fmr);
159	rds_ibdev->odp_capable =
160		!!(device->attrs.device_cap_flags &
161		   IB_DEVICE_ON_DEMAND_PAGING) &&
162		!!(device->attrs.odp_caps.per_transport_caps.rc_odp_caps &
163		   IB_ODP_SUPPORT_WRITE) &&
164		!!(device->attrs.odp_caps.per_transport_caps.rc_odp_caps &
165		   IB_ODP_SUPPORT_READ);
166
167	rds_ibdev->fmr_max_remaps = device->attrs.max_map_per_fmr?: 32;
168	rds_ibdev->max_1m_mrs = device->attrs.max_mr ?
169		min_t(unsigned int, (device->attrs.max_mr / 2),
170		      rds_ib_mr_1m_pool_size) : rds_ib_mr_1m_pool_size;
171
172	rds_ibdev->max_8k_mrs = device->attrs.max_mr ?
173		min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE),
174		      rds_ib_mr_8k_pool_size) : rds_ib_mr_8k_pool_size;
175
176	rds_ibdev->max_initiator_depth = device->attrs.max_qp_init_rd_atom;
177	rds_ibdev->max_responder_resources = device->attrs.max_qp_rd_atom;
178
179	rds_ibdev->vector_load = kcalloc(device->num_comp_vectors,
180					 sizeof(int),
181					 GFP_KERNEL);
182	if (!rds_ibdev->vector_load) {
183		pr_err("RDS/IB: %s failed to allocate vector memory\n",
184			__func__);
185		goto put_dev;
186	}
187
188	rds_ibdev->dev = device;
189	rds_ibdev->pd = ib_alloc_pd(device, 0);
190	if (IS_ERR(rds_ibdev->pd)) {
191		rds_ibdev->pd = NULL;
192		goto put_dev;
193	}
194	rds_ibdev->rid_hdrs_pool = dma_pool_create(device->name,
195						   device->dma_device,
196						   sizeof(struct rds_header),
197						   L1_CACHE_BYTES, 0);
198	if (!rds_ibdev->rid_hdrs_pool)
199		goto put_dev;
200
201	rds_ibdev->mr_1m_pool =
202		rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_1M_POOL);
203	if (IS_ERR(rds_ibdev->mr_1m_pool)) {
204		rds_ibdev->mr_1m_pool = NULL;
205		goto put_dev;
206	}
207
208	rds_ibdev->mr_8k_pool =
209		rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_8K_POOL);
210	if (IS_ERR(rds_ibdev->mr_8k_pool)) {
211		rds_ibdev->mr_8k_pool = NULL;
212		goto put_dev;
213	}
214
215	rdsdebug("RDS/IB: max_mr = %d, max_wrs = %d, max_sge = %d, fmr_max_remaps = %d, max_1m_mrs = %d, max_8k_mrs = %d\n",
216		 device->attrs.max_fmr, rds_ibdev->max_wrs, rds_ibdev->max_sge,
217		 rds_ibdev->fmr_max_remaps, rds_ibdev->max_1m_mrs,
218		 rds_ibdev->max_8k_mrs);
219
220	pr_info("RDS/IB: %s: %s supported and preferred\n",
221		device->name,
222		rds_ibdev->use_fastreg ? "FRMR" : "FMR");
223
224	down_write(&rds_ib_devices_lock);
225	list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
226	up_write(&rds_ib_devices_lock);
227	refcount_inc(&rds_ibdev->refcount);
228
229	ib_set_client_data(device, &rds_ib_client, rds_ibdev);
230	refcount_inc(&rds_ibdev->refcount);
231
232	rds_ib_nodev_connect();
233
234put_dev:
235	rds_ib_dev_put(rds_ibdev);
236}
237
238/*
239 * New connections use this to find the device to associate with the
240 * connection.  It's not in the fast path so we're not concerned about the
241 * performance of the IB call.  (As of this writing, it uses an interrupt
242 * blocking spinlock to serialize walking a per-device list of all registered
243 * clients.)
244 *
245 * RCU is used to handle incoming connections racing with device teardown.
246 * Rather than use a lock to serialize removal from the client_data and
247 * getting a new reference, we use an RCU grace period.  The destruction
248 * path removes the device from client_data and then waits for all RCU
249 * readers to finish.
250 *
251 * A new connection can get NULL from this if its arriving on a
252 * device that is in the process of being removed.
253 */
254struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
255{
256	struct rds_ib_device *rds_ibdev;
257
258	rcu_read_lock();
259	rds_ibdev = ib_get_client_data(device, &rds_ib_client);
260	if (rds_ibdev)
261		refcount_inc(&rds_ibdev->refcount);
262	rcu_read_unlock();
263	return rds_ibdev;
264}
265
266/*
267 * The IB stack is letting us know that a device is going away.  This can
268 * happen if the underlying HCA driver is removed or if PCI hotplug is removing
269 * the pci function, for example.
270 *
271 * This can be called at any time and can be racing with any other RDS path.
272 */
273static void rds_ib_remove_one(struct ib_device *device, void *client_data)
274{
275	struct rds_ib_device *rds_ibdev = client_data;
276
277	if (!rds_ibdev)
278		return;
279
280	rds_ib_dev_shutdown(rds_ibdev);
281
282	/* stop connection attempts from getting a reference to this device. */
283	ib_set_client_data(device, &rds_ib_client, NULL);
284
285	down_write(&rds_ib_devices_lock);
286	list_del_rcu(&rds_ibdev->list);
287	up_write(&rds_ib_devices_lock);
288
289	/*
290	 * This synchronize rcu is waiting for readers of both the ib
291	 * client data and the devices list to finish before we drop
292	 * both of those references.
293	 */
294	synchronize_rcu();
295	rds_ib_dev_put(rds_ibdev);
296	rds_ib_dev_put(rds_ibdev);
297}
298
299struct ib_client rds_ib_client = {
300	.name   = "rds_ib",
301	.add    = rds_ib_add_one,
302	.remove = rds_ib_remove_one
303};
304
305static int rds_ib_conn_info_visitor(struct rds_connection *conn,
306				    void *buffer)
307{
308	struct rds_info_rdma_connection *iinfo = buffer;
309	struct rds_ib_connection *ic = conn->c_transport_data;
310
311	/* We will only ever look at IB transports */
312	if (conn->c_trans != &rds_ib_transport)
313		return 0;
314	if (conn->c_isv6)
315		return 0;
316
317	iinfo->src_addr = conn->c_laddr.s6_addr32[3];
318	iinfo->dst_addr = conn->c_faddr.s6_addr32[3];
319	if (ic) {
320		iinfo->tos = conn->c_tos;
321		iinfo->sl = ic->i_sl;
322	}
323
324	memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
325	memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
326	if (rds_conn_state(conn) == RDS_CONN_UP) {
327		struct rds_ib_device *rds_ibdev;
328
329		rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo->src_gid,
330			       (union ib_gid *)&iinfo->dst_gid);
331
332		rds_ibdev = ic->rds_ibdev;
333		iinfo->max_send_wr = ic->i_send_ring.w_nr;
334		iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
335		iinfo->max_send_sge = rds_ibdev->max_sge;
336		rds_ib_get_mr_info(rds_ibdev, iinfo);
337		iinfo->cache_allocs = atomic_read(&ic->i_cache_allocs);
338	}
339	return 1;
340}
341
342#if IS_ENABLED(CONFIG_IPV6)
343/* IPv6 version of rds_ib_conn_info_visitor(). */
344static int rds6_ib_conn_info_visitor(struct rds_connection *conn,
345				     void *buffer)
346{
347	struct rds6_info_rdma_connection *iinfo6 = buffer;
348	struct rds_ib_connection *ic = conn->c_transport_data;
349
350	/* We will only ever look at IB transports */
351	if (conn->c_trans != &rds_ib_transport)
352		return 0;
353
354	iinfo6->src_addr = conn->c_laddr;
355	iinfo6->dst_addr = conn->c_faddr;
356	if (ic) {
357		iinfo6->tos = conn->c_tos;
358		iinfo6->sl = ic->i_sl;
359	}
360
361	memset(&iinfo6->src_gid, 0, sizeof(iinfo6->src_gid));
362	memset(&iinfo6->dst_gid, 0, sizeof(iinfo6->dst_gid));
363
364	if (rds_conn_state(conn) == RDS_CONN_UP) {
365		struct rds_ib_device *rds_ibdev;
366
367		rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo6->src_gid,
368			       (union ib_gid *)&iinfo6->dst_gid);
369		rds_ibdev = ic->rds_ibdev;
370		iinfo6->max_send_wr = ic->i_send_ring.w_nr;
371		iinfo6->max_recv_wr = ic->i_recv_ring.w_nr;
372		iinfo6->max_send_sge = rds_ibdev->max_sge;
373		rds6_ib_get_mr_info(rds_ibdev, iinfo6);
374		iinfo6->cache_allocs = atomic_read(&ic->i_cache_allocs);
375	}
376	return 1;
377}
378#endif
379
380static void rds_ib_ic_info(struct socket *sock, unsigned int len,
381			   struct rds_info_iterator *iter,
382			   struct rds_info_lengths *lens)
383{
384	u64 buffer[(sizeof(struct rds_info_rdma_connection) + 7) / 8];
385
386	rds_for_each_conn_info(sock, len, iter, lens,
387				rds_ib_conn_info_visitor,
388				buffer,
389				sizeof(struct rds_info_rdma_connection));
390}
391
392#if IS_ENABLED(CONFIG_IPV6)
393/* IPv6 version of rds_ib_ic_info(). */
394static void rds6_ib_ic_info(struct socket *sock, unsigned int len,
395			    struct rds_info_iterator *iter,
396			    struct rds_info_lengths *lens)
397{
398	u64 buffer[(sizeof(struct rds6_info_rdma_connection) + 7) / 8];
399
400	rds_for_each_conn_info(sock, len, iter, lens,
401			       rds6_ib_conn_info_visitor,
402			       buffer,
403			       sizeof(struct rds6_info_rdma_connection));
404}
405#endif
406
407/*
408 * Early RDS/IB was built to only bind to an address if there is an IPoIB
409 * device with that address set.
410 *
411 * If it were me, I'd advocate for something more flexible.  Sending and
412 * receiving should be device-agnostic.  Transports would try and maintain
413 * connections between peers who have messages queued.  Userspace would be
414 * allowed to influence which paths have priority.  We could call userspace
415 * asserting this policy "routing".
416 */
417static int rds_ib_laddr_check(struct net *net, const struct in6_addr *addr,
418			      __u32 scope_id)
419{
420	int ret;
421	struct rdma_cm_id *cm_id;
422#if IS_ENABLED(CONFIG_IPV6)
423	struct sockaddr_in6 sin6;
424#endif
425	struct sockaddr_in sin;
426	struct sockaddr *sa;
427	bool isv4;
428
429	isv4 = ipv6_addr_v4mapped(addr);
430	/* Create a CMA ID and try to bind it. This catches both
431	 * IB and iWARP capable NICs.
432	 */
433	cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler,
434			       NULL, RDMA_PS_TCP, IB_QPT_RC);
435	if (IS_ERR(cm_id))
436		return PTR_ERR(cm_id);
437
438	if (isv4) {
439		memset(&sin, 0, sizeof(sin));
440		sin.sin_family = AF_INET;
441		sin.sin_addr.s_addr = addr->s6_addr32[3];
442		sa = (struct sockaddr *)&sin;
443	} else {
444#if IS_ENABLED(CONFIG_IPV6)
445		memset(&sin6, 0, sizeof(sin6));
446		sin6.sin6_family = AF_INET6;
447		sin6.sin6_addr = *addr;
448		sin6.sin6_scope_id = scope_id;
449		sa = (struct sockaddr *)&sin6;
450
451		/* XXX Do a special IPv6 link local address check here.  The
452		 * reason is that rdma_bind_addr() always succeeds with IPv6
453		 * link local address regardless it is indeed configured in a
454		 * system.
455		 */
456		if (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL) {
457			struct net_device *dev;
458
459			if (scope_id == 0) {
460				ret = -EADDRNOTAVAIL;
461				goto out;
462			}
463
464			/* Use init_net for now as RDS is not network
465			 * name space aware.
466			 */
467			dev = dev_get_by_index(&init_net, scope_id);
468			if (!dev) {
469				ret = -EADDRNOTAVAIL;
470				goto out;
471			}
472			if (!ipv6_chk_addr(&init_net, addr, dev, 1)) {
473				dev_put(dev);
474				ret = -EADDRNOTAVAIL;
475				goto out;
476			}
477			dev_put(dev);
478		}
479#else
480		ret = -EADDRNOTAVAIL;
481		goto out;
482#endif
483	}
484
485	/* rdma_bind_addr will only succeed for IB & iWARP devices */
486	ret = rdma_bind_addr(cm_id, sa);
487	/* due to this, we will claim to support iWARP devices unless we
488	   check node_type. */
489	if (ret || !cm_id->device ||
490	    cm_id->device->node_type != RDMA_NODE_IB_CA)
491		ret = -EADDRNOTAVAIL;
492
493	rdsdebug("addr %pI6c%%%u ret %d node type %d\n",
494		 addr, scope_id, ret,
495		 cm_id->device ? cm_id->device->node_type : -1);
496
497out:
498	rdma_destroy_id(cm_id);
499
500	return ret;
501}
502
503static void rds_ib_unregister_client(void)
504{
505	ib_unregister_client(&rds_ib_client);
506	/* wait for rds_ib_dev_free() to complete */
507	flush_workqueue(rds_wq);
508}
509
510static void rds_ib_set_unloading(void)
511{
512	atomic_set(&rds_ib_unloading, 1);
513}
514
515static bool rds_ib_is_unloading(struct rds_connection *conn)
516{
517	struct rds_conn_path *cp = &conn->c_path[0];
518
519	return (test_bit(RDS_DESTROY_PENDING, &cp->cp_flags) ||
520		atomic_read(&rds_ib_unloading) != 0);
521}
522
523void rds_ib_exit(void)
524{
525	rds_ib_set_unloading();
526	synchronize_rcu();
527	rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
528#if IS_ENABLED(CONFIG_IPV6)
529	rds_info_deregister_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info);
530#endif
531	rds_ib_unregister_client();
532	rds_ib_destroy_nodev_conns();
533	rds_ib_sysctl_exit();
534	rds_ib_recv_exit();
535	rds_trans_unregister(&rds_ib_transport);
536	rds_ib_mr_exit();
537}
538
539static u8 rds_ib_get_tos_map(u8 tos)
540{
541	/* 1:1 user to transport map for RDMA transport.
542	 * In future, if custom map is desired, hook can export
543	 * user configurable map.
544	 */
545	return tos;
546}
547
548struct rds_transport rds_ib_transport = {
549	.laddr_check		= rds_ib_laddr_check,
550	.xmit_path_complete	= rds_ib_xmit_path_complete,
551	.xmit			= rds_ib_xmit,
552	.xmit_rdma		= rds_ib_xmit_rdma,
553	.xmit_atomic		= rds_ib_xmit_atomic,
554	.recv_path		= rds_ib_recv_path,
555	.conn_alloc		= rds_ib_conn_alloc,
556	.conn_free		= rds_ib_conn_free,
557	.conn_path_connect	= rds_ib_conn_path_connect,
558	.conn_path_shutdown	= rds_ib_conn_path_shutdown,
559	.inc_copy_to_user	= rds_ib_inc_copy_to_user,
560	.inc_free		= rds_ib_inc_free,
561	.cm_initiate_connect	= rds_ib_cm_initiate_connect,
562	.cm_handle_connect	= rds_ib_cm_handle_connect,
563	.cm_connect_complete	= rds_ib_cm_connect_complete,
564	.stats_info_copy	= rds_ib_stats_info_copy,
565	.exit			= rds_ib_exit,
566	.get_mr			= rds_ib_get_mr,
567	.sync_mr		= rds_ib_sync_mr,
568	.free_mr		= rds_ib_free_mr,
569	.flush_mrs		= rds_ib_flush_mrs,
570	.get_tos_map		= rds_ib_get_tos_map,
571	.t_owner		= THIS_MODULE,
572	.t_name			= "infiniband",
573	.t_unloading		= rds_ib_is_unloading,
574	.t_type			= RDS_TRANS_IB
575};
576
577int rds_ib_init(void)
578{
579	int ret;
580
581	INIT_LIST_HEAD(&rds_ib_devices);
582
583	ret = rds_ib_mr_init();
584	if (ret)
585		goto out;
586
587	ret = ib_register_client(&rds_ib_client);
588	if (ret)
589		goto out_mr_exit;
590
591	ret = rds_ib_sysctl_init();
592	if (ret)
593		goto out_ibreg;
594
595	ret = rds_ib_recv_init();
596	if (ret)
597		goto out_sysctl;
598
599	rds_trans_register(&rds_ib_transport);
600
601	rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
602#if IS_ENABLED(CONFIG_IPV6)
603	rds_info_register_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info);
604#endif
605
606	goto out;
607
608out_sysctl:
609	rds_ib_sysctl_exit();
610out_ibreg:
611	rds_ib_unregister_client();
612out_mr_exit:
613	rds_ib_mr_exit();
614out:
615	return ret;
616}
617
618MODULE_LICENSE("GPL");