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