drivers/infiniband/core/ucma.c

   1 /*
   2  * Copyright (c) 2005-2006 Intel Corporation.  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/completion.h>
  34 #include <linux/file.h>
  35 #include <linux/mutex.h>
  36 #include <linux/poll.h>
  37 #include <linux/sched.h>
  38 #include <linux/idr.h>
  39 #include <linux/in.h>
  40 #include <linux/in6.h>
  41 #include <linux/miscdevice.h>
  42 #include <linux/slab.h>
  43 #include <linux/sysctl.h>
  44
  45 #include <rdma/rdma_user_cm.h>
  46 #include <rdma/ib_marshall.h>
  47 #include <rdma/rdma_cm.h>
  48 #include <rdma/rdma_cm_ib.h>
  49
  50 MODULE_AUTHOR("Sean Hefty");
  51 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
  52 MODULE_LICENSE("Dual BSD/GPL");
  53
  54 static unsigned int max_backlog = 1024;
  55
  56 static struct ctl_table_header *ucma_ctl_table_hdr;
  57 static ctl_table ucma_ctl_table[] = {
  58         {
  59                 .procname       = "max_backlog",
  60                 .data           = &max_backlog,
  61                 .maxlen         = sizeof max_backlog,
  62                 .mode           = 0644,
  63                 .proc_handler   = proc_dointvec,
  64         },
  65         { }
  66 };
  67
  68 static struct ctl_path ucma_ctl_path[] = {
  69         { .procname = "net" },
  70         { .procname = "rdma_ucm" },
  71         { }
  72 };
  73
  74 struct ucma_file {
  75         struct mutex            mut;
  76         struct file             *filp;
  77         struct list_head        ctx_list;
  78         struct list_head        event_list;
  79         wait_queue_head_t       poll_wait;
  80 };
  81
  82 struct ucma_context {
  83         int                     id;
  84         struct completion       comp;
  85         atomic_t                ref;
  86         int                     events_reported;
  87         int                     backlog;
  88
  89         struct ucma_file        *file;
  90         struct rdma_cm_id       *cm_id;
  91         u64                     uid;
  92
  93         struct list_head        list;
  94         struct list_head        mc_list;
  95 };
  96
  97 struct ucma_multicast {
  98         struct ucma_context     *ctx;
  99         int                     id;
 100         int                     events_reported;
 101
 102         u64                     uid;
 103         struct list_head        list;
 104         struct sockaddr_storage addr;
 105 };
 106
 107 struct ucma_event {
 108         struct ucma_context     *ctx;
 109         struct ucma_multicast   *mc;
 110         struct list_head        list;
 111         struct rdma_cm_id       *cm_id;
 112         struct rdma_ucm_event_resp resp;
 113 };
 114
 115 static DEFINE_MUTEX(mut);
 116 static DEFINE_IDR(ctx_idr);
 117 static DEFINE_IDR(multicast_idr);
 118
 119 static inline struct ucma_context *_ucma_find_context(int id,
 120                                                       struct ucma_file *file)
 121 {
 122         struct ucma_context *ctx;
 123
 124         ctx = idr_find(&ctx_idr, id);
 125         if (!ctx)
 126                 ctx = ERR_PTR(-ENOENT);
 127         else if (ctx->file != file)
 128                 ctx = ERR_PTR(-EINVAL);
 129         return ctx;
 130 }
 131
 132 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
 133 {
 134         struct ucma_context *ctx;
 135
 136         mutex_lock(&mut);
 137         ctx = _ucma_find_context(id, file);
 138         if (!IS_ERR(ctx))
 139                 atomic_inc(&ctx->ref);
 140         mutex_unlock(&mut);
 141         return ctx;
 142 }
 143
 144 static void ucma_put_ctx(struct ucma_context *ctx)
 145 {
 146         if (atomic_dec_and_test(&ctx->ref))
 147                 complete(&ctx->comp);
 148 }
 149
 150 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
 151 {
 152         struct ucma_context *ctx;
 153         int ret;
 154
 155         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 156         if (!ctx)
 157                 return NULL;
 158
 159         atomic_set(&ctx->ref, 1);
 160         init_completion(&ctx->comp);
 161         INIT_LIST_HEAD(&ctx->mc_list);
 162         ctx->file = file;
 163
 164         do {
 165                 ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
 166                 if (!ret)
 167                         goto error;
 168
 169                 mutex_lock(&mut);
 170                 ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
 171                 mutex_unlock(&mut);
 172         } while (ret == -EAGAIN);
 173
 174         if (ret)
 175                 goto error;
 176
 177         list_add_tail(&ctx->list, &file->ctx_list);
 178         return ctx;
 179
 180 error:
 181         kfree(ctx);
 182         return NULL;
 183 }
 184
 185 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
 186 {
 187         struct ucma_multicast *mc;
 188         int ret;
 189
 190         mc = kzalloc(sizeof(*mc), GFP_KERNEL);
 191         if (!mc)
 192                 return NULL;
 193
 194         do {
 195                 ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
 196                 if (!ret)
 197                         goto error;
 198
 199                 mutex_lock(&mut);
 200                 ret = idr_get_new(&multicast_idr, mc, &mc->id);
 201                 mutex_unlock(&mut);
 202         } while (ret == -EAGAIN);
 203
 204         if (ret)
 205                 goto error;
 206
 207         mc->ctx = ctx;
 208         list_add_tail(&mc->list, &ctx->mc_list);
 209         return mc;
 210
 211 error:
 212         kfree(mc);
 213         return NULL;
 214 }
 215
 216 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
 217                                  struct rdma_conn_param *src)
 218 {
 219         if (src->private_data_len)
 220                 memcpy(dst->private_data, src->private_data,
 221                        src->private_data_len);
 222         dst->private_data_len = src->private_data_len;
 223         dst->responder_resources =src->responder_resources;
 224         dst->initiator_depth = src->initiator_depth;
 225         dst->flow_control = src->flow_control;
 226         dst->retry_count = src->retry_count;
 227         dst->rnr_retry_count = src->rnr_retry_count;
 228         dst->srq = src->srq;
 229         dst->qp_num = src->qp_num;
 230 }
 231
 232 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
 233                                struct rdma_ud_param *src)
 234 {
 235         if (src->private_data_len)
 236                 memcpy(dst->private_data, src->private_data,
 237                        src->private_data_len);
 238         dst->private_data_len = src->private_data_len;
 239         ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
 240         dst->qp_num = src->qp_num;
 241         dst->qkey = src->qkey;
 242 }
 243
 244 static void ucma_set_event_context(struct ucma_context *ctx,
 245                                    struct rdma_cm_event *event,
 246                                    struct ucma_event *uevent)
 247 {
 248         uevent->ctx = ctx;
 249         switch (event->event) {
 250         case RDMA_CM_EVENT_MULTICAST_JOIN:
 251         case RDMA_CM_EVENT_MULTICAST_ERROR:
 252                 uevent->mc = (struct ucma_multicast *)
 253                              event->param.ud.private_data;
 254                 uevent->resp.uid = uevent->mc->uid;
 255                 uevent->resp.id = uevent->mc->id;
 256                 break;
 257         default:
 258                 uevent->resp.uid = ctx->uid;
 259                 uevent->resp.id = ctx->id;
 260                 break;
 261         }
 262 }
 263
 264 static int ucma_event_handler(struct rdma_cm_id *cm_id,
 265                               struct rdma_cm_event *event)
 266 {
 267         struct ucma_event *uevent;
 268         struct ucma_context *ctx = cm_id->context;
 269         int ret = 0;
 270
 271         uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
 272         if (!uevent)
 273                 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
 274
 275         uevent->cm_id = cm_id;
 276         ucma_set_event_context(ctx, event, uevent);
 277         uevent->resp.event = event->event;
 278         uevent->resp.status = event->status;
 279         if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB)
 280                 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
 281         else
 282                 ucma_copy_conn_event(&uevent->resp.param.conn,
 283                                      &event->param.conn);
 284
 285         mutex_lock(&ctx->file->mut);
 286         if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
 287                 if (!ctx->backlog) {
 288                         ret = -ENOMEM;
 289                         kfree(uevent);
 290                         goto out;
 291                 }
 292                 ctx->backlog--;
 293         } else if (!ctx->uid) {
 294                 /*
 295                  * We ignore events for new connections until userspace has set
 296                  * their context.  This can only happen if an error occurs on a
 297                  * new connection before the user accepts it.  This is okay,
 298                  * since the accept will just fail later.
 299                  */
 300                 kfree(uevent);
 301                 goto out;
 302         }
 303
 304         list_add_tail(&uevent->list, &ctx->file->event_list);
 305         wake_up_interruptible(&ctx->file->poll_wait);
 306 out:
 307         mutex_unlock(&ctx->file->mut);
 308         return ret;
 309 }
 310
 311 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
 312                               int in_len, int out_len)
 313 {
 314         struct ucma_context *ctx;
 315         struct rdma_ucm_get_event cmd;
 316         struct ucma_event *uevent;
 317         int ret = 0;
 318         DEFINE_WAIT(wait);
 319
 320         if (out_len < sizeof uevent->resp)
 321                 return -ENOSPC;
 322
 323         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 324                 return -EFAULT;
 325
 326         mutex_lock(&file->mut);
 327         while (list_empty(&file->event_list)) {
 328                 mutex_unlock(&file->mut);
 329
 330                 if (file->filp->f_flags & O_NONBLOCK)
 331                         return -EAGAIN;
 332
 333                 if (wait_event_interruptible(file->poll_wait,
 334                                              !list_empty(&file->event_list)))
 335                         return -ERESTARTSYS;
 336
 337                 mutex_lock(&file->mut);
 338         }
 339
 340         uevent = list_entry(file->event_list.next, struct ucma_event, list);
 341
 342         if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
 343                 ctx = ucma_alloc_ctx(file);
 344                 if (!ctx) {
 345                         ret = -ENOMEM;
 346                         goto done;
 347                 }
 348                 uevent->ctx->backlog++;
 349                 ctx->cm_id = uevent->cm_id;
 350                 ctx->cm_id->context = ctx;
 351                 uevent->resp.id = ctx->id;
 352         }
 353
 354         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 355                          &uevent->resp, sizeof uevent->resp)) {
 356                 ret = -EFAULT;
 357                 goto done;
 358         }
 359
 360         list_del(&uevent->list);
 361         uevent->ctx->events_reported++;
 362         if (uevent->mc)
 363                 uevent->mc->events_reported++;
 364         kfree(uevent);
 365 done:
 366         mutex_unlock(&file->mut);
 367         return ret;
 368 }
 369
 370 static ssize_t ucma_create_id(struct ucma_file *file,
 371                                 const char __user *inbuf,
 372                                 int in_len, int out_len)
 373 {
 374         struct rdma_ucm_create_id cmd;
 375         struct rdma_ucm_create_id_resp resp;
 376         struct ucma_context *ctx;
 377         int ret;
 378
 379         if (out_len < sizeof(resp))
 380                 return -ENOSPC;
 381
 382         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 383                 return -EFAULT;
 384
 385         mutex_lock(&file->mut);
 386         ctx = ucma_alloc_ctx(file);
 387         mutex_unlock(&file->mut);
 388         if (!ctx)
 389                 return -ENOMEM;
 390
 391         ctx->uid = cmd.uid;
 392         ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps);
 393         if (IS_ERR(ctx->cm_id)) {
 394                 ret = PTR_ERR(ctx->cm_id);
 395                 goto err1;
 396         }
 397
 398         resp.id = ctx->id;
 399         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 400                          &resp, sizeof(resp))) {
 401                 ret = -EFAULT;
 402                 goto err2;
 403         }
 404         return 0;
 405
 406 err2:
 407         rdma_destroy_id(ctx->cm_id);
 408 err1:
 409         mutex_lock(&mut);
 410         idr_remove(&ctx_idr, ctx->id);
 411         mutex_unlock(&mut);
 412         kfree(ctx);
 413         return ret;
 414 }
 415
 416 static void ucma_cleanup_multicast(struct ucma_context *ctx)
 417 {
 418         struct ucma_multicast *mc, *tmp;
 419
 420         mutex_lock(&mut);
 421         list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
 422                 list_del(&mc->list);
 423                 idr_remove(&multicast_idr, mc->id);
 424                 kfree(mc);
 425         }
 426         mutex_unlock(&mut);
 427 }
 428
 429 static void ucma_cleanup_events(struct ucma_context *ctx)
 430 {
 431         struct ucma_event *uevent, *tmp;
 432
 433         list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
 434                 if (uevent->ctx != ctx)
 435                         continue;
 436
 437                 list_del(&uevent->list);
 438
 439                 /* clear incoming connections. */
 440                 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
 441                         rdma_destroy_id(uevent->cm_id);
 442
 443                 kfree(uevent);
 444         }
 445 }
 446
 447 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
 448 {
 449         struct ucma_event *uevent, *tmp;
 450
 451         list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
 452                 if (uevent->mc != mc)
 453                         continue;
 454
 455                 list_del(&uevent->list);
 456                 kfree(uevent);
 457         }
 458 }
 459
 460 static int ucma_free_ctx(struct ucma_context *ctx)
 461 {
 462         int events_reported;
 463
 464         /* No new events will be generated after destroying the id. */
 465         rdma_destroy_id(ctx->cm_id);
 466
 467         ucma_cleanup_multicast(ctx);
 468
 469         /* Cleanup events not yet reported to the user. */
 470         mutex_lock(&ctx->file->mut);
 471         ucma_cleanup_events(ctx);
 472         list_del(&ctx->list);
 473         mutex_unlock(&ctx->file->mut);
 474
 475         events_reported = ctx->events_reported;
 476         kfree(ctx);
 477         return events_reported;
 478 }
 479
 480 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
 481                                int in_len, int out_len)
 482 {
 483         struct rdma_ucm_destroy_id cmd;
 484         struct rdma_ucm_destroy_id_resp resp;
 485         struct ucma_context *ctx;
 486         int ret = 0;
 487
 488         if (out_len < sizeof(resp))
 489                 return -ENOSPC;
 490
 491         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 492                 return -EFAULT;
 493
 494         mutex_lock(&mut);
 495         ctx = _ucma_find_context(cmd.id, file);
 496         if (!IS_ERR(ctx))
 497                 idr_remove(&ctx_idr, ctx->id);
 498         mutex_unlock(&mut);
 499
 500         if (IS_ERR(ctx))
 501                 return PTR_ERR(ctx);
 502
 503         ucma_put_ctx(ctx);
 504         wait_for_completion(&ctx->comp);
 505         resp.events_reported = ucma_free_ctx(ctx);
 506
 507         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 508                          &resp, sizeof(resp)))
 509                 ret = -EFAULT;
 510
 511         return ret;
 512 }
 513
 514 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
 515                               int in_len, int out_len)
 516 {
 517         struct rdma_ucm_bind_addr cmd;
 518         struct ucma_context *ctx;
 519         int ret;
 520
 521         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 522                 return -EFAULT;
 523
 524         ctx = ucma_get_ctx(file, cmd.id);
 525         if (IS_ERR(ctx))
 526                 return PTR_ERR(ctx);
 527
 528         ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
 529         ucma_put_ctx(ctx);
 530         return ret;
 531 }
 532
 533 static ssize_t ucma_resolve_addr(struct ucma_file *file,
 534                                  const char __user *inbuf,
 535                                  int in_len, int out_len)
 536 {
 537         struct rdma_ucm_resolve_addr cmd;
 538         struct ucma_context *ctx;
 539         int ret;
 540
 541         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 542                 return -EFAULT;
 543
 544         ctx = ucma_get_ctx(file, cmd.id);
 545         if (IS_ERR(ctx))
 546                 return PTR_ERR(ctx);
 547
 548         ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
 549                                 (struct sockaddr *) &cmd.dst_addr,
 550                                 cmd.timeout_ms);
 551         ucma_put_ctx(ctx);
 552         return ret;
 553 }
 554
 555 static ssize_t ucma_resolve_route(struct ucma_file *file,
 556                                   const char __user *inbuf,
 557                                   int in_len, int out_len)
 558 {
 559         struct rdma_ucm_resolve_route cmd;
 560         struct ucma_context *ctx;
 561         int ret;
 562
 563         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 564                 return -EFAULT;
 565
 566         ctx = ucma_get_ctx(file, cmd.id);
 567         if (IS_ERR(ctx))
 568                 return PTR_ERR(ctx);
 569
 570         ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
 571         ucma_put_ctx(ctx);
 572         return ret;
 573 }
 574
 575 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
 576                                struct rdma_route *route)
 577 {
 578         struct rdma_dev_addr *dev_addr;
 579
 580         resp->num_paths = route->num_paths;
 581         switch (route->num_paths) {
 582         case 0:
 583                 dev_addr = &route->addr.dev_addr;
 584                 rdma_addr_get_dgid(dev_addr,
 585                                    (union ib_gid *) &resp->ib_route[0].dgid);
 586                 rdma_addr_get_sgid(dev_addr,
 587                                    (union ib_gid *) &resp->ib_route[0].sgid);
 588                 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
 589                 break;
 590         case 2:
 591                 ib_copy_path_rec_to_user(&resp->ib_route[1],
 592                                          &route->path_rec[1]);
 593                 /* fall through */
 594         case 1:
 595                 ib_copy_path_rec_to_user(&resp->ib_route[0],
 596                                          &route->path_rec[0]);
 597                 break;
 598         default:
 599                 break;
 600         }
 601 }
 602
 603 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
 604                                  struct rdma_route *route)
 605 {
 606         struct rdma_dev_addr *dev_addr;
 607         struct net_device *dev;
 608         u16 vid = 0;
 609
 610         resp->num_paths = route->num_paths;
 611         switch (route->num_paths) {
 612         case 0:
 613                 dev_addr = &route->addr.dev_addr;
 614                 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
 615                         if (dev) {
 616                                 vid = rdma_vlan_dev_vlan_id(dev);
 617                                 dev_put(dev);
 618                         }
 619
 620                 iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid,
 621                                     dev_addr->dst_dev_addr, vid);
 622                 iboe_addr_get_sgid(dev_addr,
 623                                    (union ib_gid *) &resp->ib_route[0].sgid);
 624                 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
 625                 break;
 626         case 2:
 627                 ib_copy_path_rec_to_user(&resp->ib_route[1],
 628                                          &route->path_rec[1]);
 629                 /* fall through */
 630         case 1:
 631                 ib_copy_path_rec_to_user(&resp->ib_route[0],
 632                                          &route->path_rec[0]);
 633                 break;
 634         default:
 635                 break;
 636         }
 637 }
 638
 639 static ssize_t ucma_query_route(struct ucma_file *file,
 640                                 const char __user *inbuf,
 641                                 int in_len, int out_len)
 642 {
 643         struct rdma_ucm_query_route cmd;
 644         struct rdma_ucm_query_route_resp resp;
 645         struct ucma_context *ctx;
 646         struct sockaddr *addr;
 647         int ret = 0;
 648
 649         if (out_len < sizeof(resp))
 650                 return -ENOSPC;
 651
 652         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 653                 return -EFAULT;
 654
 655         ctx = ucma_get_ctx(file, cmd.id);
 656         if (IS_ERR(ctx))
 657                 return PTR_ERR(ctx);
 658
 659         memset(&resp, 0, sizeof resp);
 660         addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
 661         memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
 662                                      sizeof(struct sockaddr_in) :
 663                                      sizeof(struct sockaddr_in6));
 664         addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
 665         memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
 666                                      sizeof(struct sockaddr_in) :
 667                                      sizeof(struct sockaddr_in6));
 668         if (!ctx->cm_id->device)
 669                 goto out;
 670
 671         resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
 672         resp.port_num = ctx->cm_id->port_num;
 673         if (rdma_node_get_transport(ctx->cm_id->device->node_type) == RDMA_TRANSPORT_IB) {
 674                 switch (rdma_port_get_link_layer(ctx->cm_id->device, ctx->cm_id->port_num)) {
 675                 case IB_LINK_LAYER_INFINIBAND:
 676                         ucma_copy_ib_route(&resp, &ctx->cm_id->route);
 677                         break;
 678                 case IB_LINK_LAYER_ETHERNET:
 679                         ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
 680                         break;
 681                 default:
 682                         break;
 683                 }
 684         }
 685
 686 out:
 687         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 688                          &resp, sizeof(resp)))
 689                 ret = -EFAULT;
 690
 691         ucma_put_ctx(ctx);
 692         return ret;
 693 }
 694
 695 static void ucma_copy_conn_param(struct rdma_conn_param *dst,
 696                                  struct rdma_ucm_conn_param *src)
 697 {
 698         dst->private_data = src->private_data;
 699         dst->private_data_len = src->private_data_len;
 700         dst->responder_resources =src->responder_resources;
 701         dst->initiator_depth = src->initiator_depth;
 702         dst->flow_control = src->flow_control;
 703         dst->retry_count = src->retry_count;
 704         dst->rnr_retry_count = src->rnr_retry_count;
 705         dst->srq = src->srq;
 706         dst->qp_num = src->qp_num;
 707 }
 708
 709 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
 710                             int in_len, int out_len)
 711 {
 712         struct rdma_ucm_connect cmd;
 713         struct rdma_conn_param conn_param;
 714         struct ucma_context *ctx;
 715         int ret;
 716
 717         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 718                 return -EFAULT;
 719
 720         if (!cmd.conn_param.valid)
 721                 return -EINVAL;
 722
 723         ctx = ucma_get_ctx(file, cmd.id);
 724         if (IS_ERR(ctx))
 725                 return PTR_ERR(ctx);
 726
 727         ucma_copy_conn_param(&conn_param, &cmd.conn_param);
 728         ret = rdma_connect(ctx->cm_id, &conn_param);
 729         ucma_put_ctx(ctx);
 730         return ret;
 731 }
 732
 733 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
 734                            int in_len, int out_len)
 735 {
 736         struct rdma_ucm_listen cmd;
 737         struct ucma_context *ctx;
 738         int ret;
 739
 740         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 741                 return -EFAULT;
 742
 743         ctx = ucma_get_ctx(file, cmd.id);
 744         if (IS_ERR(ctx))
 745                 return PTR_ERR(ctx);
 746
 747         ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
 748                        cmd.backlog : max_backlog;
 749         ret = rdma_listen(ctx->cm_id, ctx->backlog);
 750         ucma_put_ctx(ctx);
 751         return ret;
 752 }
 753
 754 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
 755                            int in_len, int out_len)
 756 {
 757         struct rdma_ucm_accept cmd;
 758         struct rdma_conn_param conn_param;
 759         struct ucma_context *ctx;
 760         int ret;
 761
 762         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 763                 return -EFAULT;
 764
 765         ctx = ucma_get_ctx(file, cmd.id);
 766         if (IS_ERR(ctx))
 767                 return PTR_ERR(ctx);
 768
 769         if (cmd.conn_param.valid) {
 770                 ctx->uid = cmd.uid;
 771                 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
 772                 ret = rdma_accept(ctx->cm_id, &conn_param);
 773         } else
 774                 ret = rdma_accept(ctx->cm_id, NULL);
 775
 776         ucma_put_ctx(ctx);
 777         return ret;
 778 }
 779
 780 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
 781                            int in_len, int out_len)
 782 {
 783         struct rdma_ucm_reject cmd;
 784         struct ucma_context *ctx;
 785         int ret;
 786
 787         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 788                 return -EFAULT;
 789
 790         ctx = ucma_get_ctx(file, cmd.id);
 791         if (IS_ERR(ctx))
 792                 return PTR_ERR(ctx);
 793
 794         ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
 795         ucma_put_ctx(ctx);
 796         return ret;
 797 }
 798
 799 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
 800                                int in_len, int out_len)
 801 {
 802         struct rdma_ucm_disconnect cmd;
 803         struct ucma_context *ctx;
 804         int ret;
 805
 806         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 807                 return -EFAULT;
 808
 809         ctx = ucma_get_ctx(file, cmd.id);
 810         if (IS_ERR(ctx))
 811                 return PTR_ERR(ctx);
 812
 813         ret = rdma_disconnect(ctx->cm_id);
 814         ucma_put_ctx(ctx);
 815         return ret;
 816 }
 817
 818 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
 819                                  const char __user *inbuf,
 820                                  int in_len, int out_len)
 821 {
 822         struct rdma_ucm_init_qp_attr cmd;
 823         struct ib_uverbs_qp_attr resp;
 824         struct ucma_context *ctx;
 825         struct ib_qp_attr qp_attr;
 826         int ret;
 827
 828         if (out_len < sizeof(resp))
 829                 return -ENOSPC;
 830
 831         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 832                 return -EFAULT;
 833
 834         ctx = ucma_get_ctx(file, cmd.id);
 835         if (IS_ERR(ctx))
 836                 return PTR_ERR(ctx);
 837
 838         resp.qp_attr_mask = 0;
 839         memset(&qp_attr, 0, sizeof qp_attr);
 840         qp_attr.qp_state = cmd.qp_state;
 841         ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
 842         if (ret)
 843                 goto out;
 844
 845         ib_copy_qp_attr_to_user(&resp, &qp_attr);
 846         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 847                          &resp, sizeof(resp)))
 848                 ret = -EFAULT;
 849
 850 out:
 851         ucma_put_ctx(ctx);
 852         return ret;
 853 }
 854
 855 static int ucma_set_option_id(struct ucma_context *ctx, int optname,
 856                               void *optval, size_t optlen)
 857 {
 858         int ret = 0;
 859
 860         switch (optname) {
 861         case RDMA_OPTION_ID_TOS:
 862                 if (optlen != sizeof(u8)) {
 863                         ret = -EINVAL;
 864                         break;
 865                 }
 866                 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
 867                 break;
 868         default:
 869                 ret = -ENOSYS;
 870         }
 871
 872         return ret;
 873 }
 874
 875 static int ucma_set_ib_path(struct ucma_context *ctx,
 876                             struct ib_path_rec_data *path_data, size_t optlen)
 877 {
 878         struct ib_sa_path_rec sa_path;
 879         struct rdma_cm_event event;
 880         int ret;
 881
 882         if (optlen % sizeof(*path_data))
 883                 return -EINVAL;
 884
 885         for (; optlen; optlen -= sizeof(*path_data), path_data++) {
 886                 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
 887                                          IB_PATH_BIDIRECTIONAL))
 888                         break;
 889         }
 890
 891         if (!optlen)
 892                 return -EINVAL;
 893
 894         ib_sa_unpack_path(path_data->path_rec, &sa_path);
 895         ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
 896         if (ret)
 897                 return ret;
 898
 899         memset(&event, 0, sizeof event);
 900         event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
 901         return ucma_event_handler(ctx->cm_id, &event);
 902 }
 903
 904 static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
 905                               void *optval, size_t optlen)
 906 {
 907         int ret;
 908
 909         switch (optname) {
 910         case RDMA_OPTION_IB_PATH:
 911                 ret = ucma_set_ib_path(ctx, optval, optlen);
 912                 break;
 913         default:
 914                 ret = -ENOSYS;
 915         }
 916
 917         return ret;
 918 }
 919
 920 static int ucma_set_option_level(struct ucma_context *ctx, int level,
 921                                  int optname, void *optval, size_t optlen)
 922 {
 923         int ret;
 924
 925         switch (level) {
 926         case RDMA_OPTION_ID:
 927                 ret = ucma_set_option_id(ctx, optname, optval, optlen);
 928                 break;
 929         case RDMA_OPTION_IB:
 930                 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
 931                 break;
 932         default:
 933                 ret = -ENOSYS;
 934         }
 935
 936         return ret;
 937 }
 938
 939 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
 940                                int in_len, int out_len)
 941 {
 942         struct rdma_ucm_set_option cmd;
 943         struct ucma_context *ctx;
 944         void *optval;
 945         int ret;
 946
 947         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 948                 return -EFAULT;
 949
 950         ctx = ucma_get_ctx(file, cmd.id);
 951         if (IS_ERR(ctx))
 952                 return PTR_ERR(ctx);
 953
 954         optval = kmalloc(cmd.optlen, GFP_KERNEL);
 955         if (!optval) {
 956                 ret = -ENOMEM;
 957                 goto out1;
 958         }
 959
 960         if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval,
 961                            cmd.optlen)) {
 962                 ret = -EFAULT;
 963                 goto out2;
 964         }
 965
 966         ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
 967                                     cmd.optlen);
 968 out2:
 969         kfree(optval);
 970 out1:
 971         ucma_put_ctx(ctx);
 972         return ret;
 973 }
 974
 975 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
 976                            int in_len, int out_len)
 977 {
 978         struct rdma_ucm_notify cmd;
 979         struct ucma_context *ctx;
 980         int ret;
 981
 982         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 983                 return -EFAULT;
 984
 985         ctx = ucma_get_ctx(file, cmd.id);
 986         if (IS_ERR(ctx))
 987                 return PTR_ERR(ctx);
 988
 989         ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
 990         ucma_put_ctx(ctx);
 991         return ret;
 992 }
 993
 994 static ssize_t ucma_join_multicast(struct ucma_file *file,
 995                                    const char __user *inbuf,
 996                                    int in_len, int out_len)
 997 {
 998         struct rdma_ucm_join_mcast cmd;
 999         struct rdma_ucm_create_id_resp resp;
1000         struct ucma_context *ctx;
1001         struct ucma_multicast *mc;
1002         int ret;
1003
1004         if (out_len < sizeof(resp))
1005                 return -ENOSPC;
1006
1007         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1008                 return -EFAULT;
1009
1010         ctx = ucma_get_ctx(file, cmd.id);
1011         if (IS_ERR(ctx))
1012                 return PTR_ERR(ctx);
1013
1014         mutex_lock(&file->mut);
1015         mc = ucma_alloc_multicast(ctx);
1016         if (!mc) {
1017                 ret = -ENOMEM;
1018                 goto err1;
1019         }
1020
1021         mc->uid = cmd.uid;
1022         memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
1023         ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
1024         if (ret)
1025                 goto err2;
1026
1027         resp.id = mc->id;
1028         if (copy_to_user((void __user *)(unsigned long)cmd.response,
1029                          &resp, sizeof(resp))) {
1030                 ret = -EFAULT;
1031                 goto err3;
1032         }
1033
1034         mutex_unlock(&file->mut);
1035         ucma_put_ctx(ctx);
1036         return 0;
1037
1038 err3:
1039         rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1040         ucma_cleanup_mc_events(mc);
1041 err2:
1042         mutex_lock(&mut);
1043         idr_remove(&multicast_idr, mc->id);
1044         mutex_unlock(&mut);
1045         list_del(&mc->list);
1046         kfree(mc);
1047 err1:
1048         mutex_unlock(&file->mut);
1049         ucma_put_ctx(ctx);
1050         return ret;
1051 }
1052
1053 static ssize_t ucma_leave_multicast(struct ucma_file *file,
1054                                     const char __user *inbuf,
1055                                     int in_len, int out_len)
1056 {
1057         struct rdma_ucm_destroy_id cmd;
1058         struct rdma_ucm_destroy_id_resp resp;
1059         struct ucma_multicast *mc;
1060         int ret = 0;
1061
1062         if (out_len < sizeof(resp))
1063                 return -ENOSPC;
1064
1065         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1066                 return -EFAULT;
1067
1068         mutex_lock(&mut);
1069         mc = idr_find(&multicast_idr, cmd.id);
1070         if (!mc)
1071                 mc = ERR_PTR(-ENOENT);
1072         else if (mc->ctx->file != file)
1073                 mc = ERR_PTR(-EINVAL);
1074         else {
1075                 idr_remove(&multicast_idr, mc->id);
1076                 atomic_inc(&mc->ctx->ref);
1077         }
1078         mutex_unlock(&mut);
1079
1080         if (IS_ERR(mc)) {
1081                 ret = PTR_ERR(mc);
1082                 goto out;
1083         }
1084
1085         rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1086         mutex_lock(&mc->ctx->file->mut);
1087         ucma_cleanup_mc_events(mc);
1088         list_del(&mc->list);
1089         mutex_unlock(&mc->ctx->file->mut);
1090
1091         ucma_put_ctx(mc->ctx);
1092         resp.events_reported = mc->events_reported;
1093         kfree(mc);
1094
1095         if (copy_to_user((void __user *)(unsigned long)cmd.response,
1096                          &resp, sizeof(resp)))
1097                 ret = -EFAULT;
1098 out:
1099         return ret;
1100 }
1101
1102 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1103 {
1104         /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1105         if (file1 < file2) {
1106                 mutex_lock(&file1->mut);
1107                 mutex_lock(&file2->mut);
1108         } else {
1109                 mutex_lock(&file2->mut);
1110                 mutex_lock(&file1->mut);
1111         }
1112 }
1113
1114 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1115 {
1116         if (file1 < file2) {
1117                 mutex_unlock(&file2->mut);
1118                 mutex_unlock(&file1->mut);
1119         } else {
1120                 mutex_unlock(&file1->mut);
1121                 mutex_unlock(&file2->mut);
1122         }
1123 }
1124
1125 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1126 {
1127         struct ucma_event *uevent, *tmp;
1128
1129         list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1130                 if (uevent->ctx == ctx)
1131                         list_move_tail(&uevent->list, &file->event_list);
1132 }
1133
1134 static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1135                                const char __user *inbuf,
1136                                int in_len, int out_len)
1137 {
1138         struct rdma_ucm_migrate_id cmd;
1139         struct rdma_ucm_migrate_resp resp;
1140         struct ucma_context *ctx;
1141         struct file *filp;
1142         struct ucma_file *cur_file;
1143         int ret = 0;
1144
1145         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1146                 return -EFAULT;
1147
1148         /* Get current fd to protect against it being closed */
1149         filp = fget(cmd.fd);
1150         if (!filp)
1151                 return -ENOENT;
1152
1153         /* Validate current fd and prevent destruction of id. */
1154         ctx = ucma_get_ctx(filp->private_data, cmd.id);
1155         if (IS_ERR(ctx)) {
1156                 ret = PTR_ERR(ctx);
1157                 goto file_put;
1158         }
1159
1160         cur_file = ctx->file;
1161         if (cur_file == new_file) {
1162                 resp.events_reported = ctx->events_reported;
1163                 goto response;
1164         }
1165
1166         /*
1167          * Migrate events between fd's, maintaining order, and avoiding new
1168          * events being added before existing events.
1169          */
1170         ucma_lock_files(cur_file, new_file);
1171         mutex_lock(&mut);
1172
1173         list_move_tail(&ctx->list, &new_file->ctx_list);
1174         ucma_move_events(ctx, new_file);
1175         ctx->file = new_file;
1176         resp.events_reported = ctx->events_reported;
1177
1178         mutex_unlock(&mut);
1179         ucma_unlock_files(cur_file, new_file);
1180
1181 response:
1182         if (copy_to_user((void __user *)(unsigned long)cmd.response,
1183                          &resp, sizeof(resp)))
1184                 ret = -EFAULT;
1185
1186         ucma_put_ctx(ctx);
1187 file_put:
1188         fput(filp);
1189         return ret;
1190 }
1191
1192 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1193                                    const char __user *inbuf,
1194                                    int in_len, int out_len) = {
1195         [RDMA_USER_CM_CMD_CREATE_ID]    = ucma_create_id,
1196         [RDMA_USER_CM_CMD_DESTROY_ID]   = ucma_destroy_id,
1197         [RDMA_USER_CM_CMD_BIND_ADDR]    = ucma_bind_addr,
1198         [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1199         [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
1200         [RDMA_USER_CM_CMD_QUERY_ROUTE]  = ucma_query_route,
1201         [RDMA_USER_CM_CMD_CONNECT]      = ucma_connect,
1202         [RDMA_USER_CM_CMD_LISTEN]       = ucma_listen,
1203         [RDMA_USER_CM_CMD_ACCEPT]       = ucma_accept,
1204         [RDMA_USER_CM_CMD_REJECT]       = ucma_reject,
1205         [RDMA_USER_CM_CMD_DISCONNECT]   = ucma_disconnect,
1206         [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1207         [RDMA_USER_CM_CMD_GET_EVENT]    = ucma_get_event,
1208         [RDMA_USER_CM_CMD_GET_OPTION]   = NULL,
1209         [RDMA_USER_CM_CMD_SET_OPTION]   = ucma_set_option,
1210         [RDMA_USER_CM_CMD_NOTIFY]       = ucma_notify,
1211         [RDMA_USER_CM_CMD_JOIN_MCAST]   = ucma_join_multicast,
1212         [RDMA_USER_CM_CMD_LEAVE_MCAST]  = ucma_leave_multicast,
1213         [RDMA_USER_CM_CMD_MIGRATE_ID]   = ucma_migrate_id
1214 };
1215
1216 static ssize_t ucma_write(struct file *filp, const char __user *buf,
1217                           size_t len, loff_t *pos)
1218 {
1219         struct ucma_file *file = filp->private_data;
1220         struct rdma_ucm_cmd_hdr hdr;
1221         ssize_t ret;
1222
1223         if (len < sizeof(hdr))
1224                 return -EINVAL;
1225
1226         if (copy_from_user(&hdr, buf, sizeof(hdr)))
1227                 return -EFAULT;
1228
1229         if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1230                 return -EINVAL;
1231
1232         if (hdr.in + sizeof(hdr) > len)
1233                 return -EINVAL;
1234
1235         if (!ucma_cmd_table[hdr.cmd])
1236                 return -ENOSYS;
1237
1238         ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1239         if (!ret)
1240                 ret = len;
1241
1242         return ret;
1243 }
1244
1245 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1246 {
1247         struct ucma_file *file = filp->private_data;
1248         unsigned int mask = 0;
1249
1250         poll_wait(filp, &file->poll_wait, wait);
1251
1252         if (!list_empty(&file->event_list))
1253                 mask = POLLIN | POLLRDNORM;
1254
1255         return mask;
1256 }
1257
1258 /*
1259  * ucma_open() does not need the BKL:
1260  *
1261  *  - no global state is referred to;
1262  *  - there is no ioctl method to race against;
1263  *  - no further module initialization is required for open to work
1264  *    after the device is registered.
1265  */
1266 static int ucma_open(struct inode *inode, struct file *filp)
1267 {
1268         struct ucma_file *file;
1269
1270         file = kmalloc(sizeof *file, GFP_KERNEL);
1271         if (!file)
1272                 return -ENOMEM;
1273
1274         INIT_LIST_HEAD(&file->event_list);
1275         INIT_LIST_HEAD(&file->ctx_list);
1276         init_waitqueue_head(&file->poll_wait);
1277         mutex_init(&file->mut);
1278
1279         filp->private_data = file;
1280         file->filp = filp;
1281
1282         return nonseekable_open(inode, filp);
1283 }
1284
1285 static int ucma_close(struct inode *inode, struct file *filp)
1286 {
1287         struct ucma_file *file = filp->private_data;
1288         struct ucma_context *ctx, *tmp;
1289
1290         mutex_lock(&file->mut);
1291         list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1292                 mutex_unlock(&file->mut);
1293
1294                 mutex_lock(&mut);
1295                 idr_remove(&ctx_idr, ctx->id);
1296                 mutex_unlock(&mut);
1297
1298                 ucma_free_ctx(ctx);
1299                 mutex_lock(&file->mut);
1300         }
1301         mutex_unlock(&file->mut);
1302         kfree(file);
1303         return 0;
1304 }
1305
1306 static const struct file_operations ucma_fops = {
1307         .owner   = THIS_MODULE,
1308         .open    = ucma_open,
1309         .release = ucma_close,
1310         .write   = ucma_write,
1311         .poll    = ucma_poll,
1312         .llseek  = no_llseek,
1313 };
1314
1315 static struct miscdevice ucma_misc = {
1316         .minor  = MISC_DYNAMIC_MINOR,
1317         .name   = "rdma_cm",
1318         .fops   = &ucma_fops,
1319 };
1320
1321 static ssize_t show_abi_version(struct device *dev,
1322                                 struct device_attribute *attr,
1323                                 char *buf)
1324 {
1325         return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1326 }
1327 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1328
1329 static int __init ucma_init(void)
1330 {
1331         int ret;
1332
1333         ret = misc_register(&ucma_misc);
1334         if (ret)
1335                 return ret;
1336
1337         ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1338         if (ret) {
1339                 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1340                 goto err1;
1341         }
1342
1343         ucma_ctl_table_hdr = register_sysctl_paths(ucma_ctl_path, ucma_ctl_table);
1344         if (!ucma_ctl_table_hdr) {
1345                 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n");
1346                 ret = -ENOMEM;
1347                 goto err2;
1348         }
1349         return 0;
1350 err2:
1351         device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1352 err1:
1353         misc_deregister(&ucma_misc);
1354         return ret;
1355 }
1356
1357 static void __exit ucma_cleanup(void)
1358 {
1359         unregister_sysctl_table(ucma_ctl_table_hdr);
1360         device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1361         misc_deregister(&ucma_misc);
1362         idr_destroy(&ctx_idr);
1363 }
1364
1365 module_init(ucma_init);
1366 module_exit(ucma_cleanup);