net/rds/ib.c

   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.device_cap_flags &
 158                    IB_DEVICE_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");