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TOMOYO Linux Cross Reference
Linux/net/rds/ib.c

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  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 
 49 static unsigned int rds_ib_mr_1m_pool_size = RDS_MR_1M_POOL_SIZE;
 50 static unsigned int rds_ib_mr_8k_pool_size = RDS_MR_8K_POOL_SIZE;
 51 unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
 52 static atomic_t rds_ib_unloading;
 53 
 54 module_param(rds_ib_mr_1m_pool_size, int, 0444);
 55 MODULE_PARM_DESC(rds_ib_mr_1m_pool_size, " Max number of 1M mr per HCA");
 56 module_param(rds_ib_mr_8k_pool_size, int, 0444);
 57 MODULE_PARM_DESC(rds_ib_mr_8k_pool_size, " Max number of 8K mr per HCA");
 58 module_param(rds_ib_retry_count, int, 0444);
 59 MODULE_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  */
 66 DECLARE_RWSEM(rds_ib_devices_lock);
 67 struct list_head rds_ib_devices;
 68 
 69 /* NOTE: if also grabbing ibdev lock, grab this first */
 70 DEFINE_SPINLOCK(ib_nodev_conns_lock);
 71 LIST_HEAD(ib_nodev_conns);
 72 
 73 static 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 
 83 static 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  */
 98 static 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 
121 void 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 
128 static 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 
225 put_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  */
246 struct 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  */
265 static 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 
288 struct ib_client rds_ib_client = {
289         .name   = "rds_ib",
290         .add    = rds_ib_add_one,
291         .remove = rds_ib_remove_one
292 };
293 
294 static 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(). */
333 static 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 
369 static 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(). */
383 static 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  */
406 static 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 
486 out:
487         rdma_destroy_id(cm_id);
488 
489         return ret;
490 }
491 
492 static 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 
499 static void rds_ib_set_unloading(void)
500 {
501         atomic_set(&rds_ib_unloading, 1);
502 }
503 
504 static 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 
512 void 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 
528 static 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 
537 struct 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 
566 int 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 
597 out_sysctl:
598         rds_ib_sysctl_exit();
599 out_ibreg:
600         rds_ib_unregister_client();
601 out_mr_exit:
602         rds_ib_mr_exit();
603 out:
604         return ret;
605 }
606 
607 MODULE_LICENSE("GPL");
608 

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