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 #include <linux/module.h>
  45
  46 #include <rdma/rdma_user_cm.h>
  47 #include <rdma/ib_marshall.h>
  48 #include <rdma/rdma_cm.h>
  49 #include <rdma/rdma_cm_ib.h>
  50
  51 MODULE_AUTHOR("Sean Hefty");
  52 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
  53 MODULE_LICENSE("Dual BSD/GPL");
  54
  55 static unsigned int max_backlog = 1024;
  56
  57 static struct ctl_table_header *ucma_ctl_table_hdr;
  58 static ctl_table ucma_ctl_table[] = {
  59         {
  60                 .procname       = "max_backlog",
  61                 .data           = &max_backlog,
  62                 .maxlen         = sizeof max_backlog,
  63                 .mode           = 0644,
  64                 .proc_handler   = proc_dointvec,
  65         },
  66         { }
  67 };
  68
  69 static struct ctl_path ucma_ctl_path[] = {
  70         { .procname = "net" },
  71         { .procname = "rdma_ucm" },
  72         { }
  73 };
  74
  75 struct ucma_file {
  76         struct mutex            mut;
  77         struct file             *filp;
  78         struct list_head        ctx_list;
  79         struct list_head        event_list;
  80         wait_queue_head_t       poll_wait;
  81 };
  82
  83 struct ucma_context {
  84         int                     id;
  85         struct completion       comp;
  86         atomic_t                ref;
  87         int                     events_reported;
  88         int                     backlog;
  89
  90         struct ucma_file        *file;
  91         struct rdma_cm_id       *cm_id;
  92         u64                     uid;
  93
  94         struct list_head        list;
  95         struct list_head        mc_list;
  96 };
  97
  98 struct ucma_multicast {
  99         struct ucma_context     *ctx;
 100         int                     id;
 101         int                     events_reported;
 102
 103         u64                     uid;
 104         struct list_head        list;
 105         struct sockaddr_storage addr;
 106 };
 107
 108 struct ucma_event {
 109         struct ucma_context     *ctx;
 110         struct ucma_multicast   *mc;
 111         struct list_head        list;
 112         struct rdma_cm_id       *cm_id;
 113         struct rdma_ucm_event_resp resp;
 114 };
 115
 116 static DEFINE_MUTEX(mut);
 117 static DEFINE_IDR(ctx_idr);
 118 static DEFINE_IDR(multicast_idr);
 119
 120 static inline struct ucma_context *_ucma_find_context(int id,
 121                                                       struct ucma_file *file)
 122 {
 123         struct ucma_context *ctx;
 124
 125         ctx = idr_find(&ctx_idr, id);
 126         if (!ctx)
 127                 ctx = ERR_PTR(-ENOENT);
 128         else if (ctx->file != file)
 129                 ctx = ERR_PTR(-EINVAL);
 130         return ctx;
 131 }
 132
 133 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
 134 {
 135         struct ucma_context *ctx;
 136
 137         mutex_lock(&mut);
 138         ctx = _ucma_find_context(id, file);
 139         if (!IS_ERR(ctx))
 140                 atomic_inc(&ctx->ref);
 141         mutex_unlock(&mut);
 142         return ctx;
 143 }
 144
 145 static void ucma_put_ctx(struct ucma_context *ctx)
 146 {
 147         if (atomic_dec_and_test(&ctx->ref))
 148                 complete(&ctx->comp);
 149 }
 150
 151 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
 152 {
 153         struct ucma_context *ctx;
 154         int ret;
 155
 156         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 157         if (!ctx)
 158                 return NULL;
 159
 160         atomic_set(&ctx->ref, 1);
 161         init_completion(&ctx->comp);
 162         INIT_LIST_HEAD(&ctx->mc_list);
 163         ctx->file = file;
 164
 165         do {
 166                 ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
 167                 if (!ret)
 168                         goto error;
 169
 170                 mutex_lock(&mut);
 171                 ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
 172                 mutex_unlock(&mut);
 173         } while (ret == -EAGAIN);
 174
 175         if (ret)
 176                 goto error;
 177
 178         list_add_tail(&ctx->list, &file->ctx_list);
 179         return ctx;
 180
 181 error:
 182         kfree(ctx);
 183         return NULL;
 184 }
 185
 186 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
 187 {
 188         struct ucma_multicast *mc;
 189         int ret;
 190
 191         mc = kzalloc(sizeof(*mc), GFP_KERNEL);
 192         if (!mc)
 193                 return NULL;
 194
 195         do {
 196                 ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
 197                 if (!ret)
 198                         goto error;
 199
 200                 mutex_lock(&mut);
 201                 ret = idr_get_new(&multicast_idr, mc, &mc->id);
 202                 mutex_unlock(&mut);
 203         } while (ret == -EAGAIN);
 204
 205         if (ret)
 206                 goto error;
 207
 208         mc->ctx = ctx;
 209         list_add_tail(&mc->list, &ctx->mc_list);
 210         return mc;
 211
 212 error:
 213         kfree(mc);
 214         return NULL;
 215 }
 216
 217 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
 218                                  struct rdma_conn_param *src)
 219 {
 220         if (src->private_data_len)
 221                 memcpy(dst->private_data, src->private_data,
 222                        src->private_data_len);
 223         dst->private_data_len = src->private_data_len;
 224         dst->responder_resources =src->responder_resources;
 225         dst->initiator_depth = src->initiator_depth;
 226         dst->flow_control = src->flow_control;
 227         dst->retry_count = src->retry_count;
 228         dst->rnr_retry_count = src->rnr_retry_count;
 229         dst->srq = src->srq;
 230         dst->qp_num = src->qp_num;
 231 }
 232
 233 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
 234                                struct rdma_ud_param *src)
 235 {
 236         if (src->private_data_len)
 237                 memcpy(dst->private_data, src->private_data,
 238                        src->private_data_len);
 239         dst->private_data_len = src->private_data_len;
 240         ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
 241         dst->qp_num = src->qp_num;
 242         dst->qkey = src->qkey;
 243 }
 244
 245 static void ucma_set_event_context(struct ucma_context *ctx,
 246                                    struct rdma_cm_event *event,
 247                                    struct ucma_event *uevent)
 248 {
 249         uevent->ctx = ctx;
 250         switch (event->event) {
 251         case RDMA_CM_EVENT_MULTICAST_JOIN:
 252         case RDMA_CM_EVENT_MULTICAST_ERROR:
 253                 uevent->mc = (struct ucma_multicast *)
 254                              event->param.ud.private_data;
 255                 uevent->resp.uid = uevent->mc->uid;
 256                 uevent->resp.id = uevent->mc->id;
 257                 break;
 258         default:
 259                 uevent->resp.uid = ctx->uid;
 260                 uevent->resp.id = ctx->id;
 261                 break;
 262         }
 263 }
 264
 265 static int ucma_event_handler(struct rdma_cm_id *cm_id,
 266                               struct rdma_cm_event *event)
 267 {
 268         struct ucma_event *uevent;
 269         struct ucma_context *ctx = cm_id->context;
 270         int ret = 0;
 271
 272         uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
 273         if (!uevent)
 274                 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
 275
 276         uevent->cm_id = cm_id;
 277         ucma_set_event_context(ctx, event, uevent);
 278         uevent->resp.event = event->event;
 279         uevent->resp.status = event->status;
 280         if (cm_id->qp_type == IB_QPT_UD)
 281                 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
 282         else
 283                 ucma_copy_conn_event(&uevent->resp.param.conn,
 284                                      &event->param.conn);
 285
 286         mutex_lock(&ctx->file->mut);
 287         if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
 288                 if (!ctx->backlog) {
 289                         ret = -ENOMEM;
 290                         kfree(uevent);
 291                         goto out;
 292                 }
 293                 ctx->backlog--;
 294         } else if (!ctx->uid) {
 295                 /*
 296                  * We ignore events for new connections until userspace has set
 297                  * their context.  This can only happen if an error occurs on a
 298                  * new connection before the user accepts it.  This is okay,
 299                  * since the accept will just fail later.
 300                  */
 301                 kfree(uevent);
 302                 goto out;
 303         }
 304
 305         list_add_tail(&uevent->list, &ctx->file->event_list);
 306         wake_up_interruptible(&ctx->file->poll_wait);
 307 out:
 308         mutex_unlock(&ctx->file->mut);
 309         return ret;
 310 }
 311
 312 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
 313                               int in_len, int out_len)
 314 {
 315         struct ucma_context *ctx;
 316         struct rdma_ucm_get_event cmd;
 317         struct ucma_event *uevent;
 318         int ret = 0;
 319         DEFINE_WAIT(wait);
 320
 321         if (out_len < sizeof uevent->resp)
 322                 return -ENOSPC;
 323
 324         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 325                 return -EFAULT;
 326
 327         mutex_lock(&file->mut);
 328         while (list_empty(&file->event_list)) {
 329                 mutex_unlock(&file->mut);
 330
 331                 if (file->filp->f_flags & O_NONBLOCK)
 332                         return -EAGAIN;
 333
 334                 if (wait_event_interruptible(file->poll_wait,
 335                                              !list_empty(&file->event_list)))
 336                         return -ERESTARTSYS;
 337
 338                 mutex_lock(&file->mut);
 339         }
 340
 341         uevent = list_entry(file->event_list.next, struct ucma_event, list);
 342
 343         if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
 344                 ctx = ucma_alloc_ctx(file);
 345                 if (!ctx) {
 346                         ret = -ENOMEM;
 347                         goto done;
 348                 }
 349                 uevent->ctx->backlog++;
 350                 ctx->cm_id = uevent->cm_id;
 351                 ctx->cm_id->context = ctx;
 352                 uevent->resp.id = ctx->id;
 353         }
 354
 355         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 356                          &uevent->resp, sizeof uevent->resp)) {
 357                 ret = -EFAULT;
 358                 goto done;
 359         }
 360
 361         list_del(&uevent->list);
 362         uevent->ctx->events_reported++;
 363         if (uevent->mc)
 364                 uevent->mc->events_reported++;
 365         kfree(uevent);
 366 done:
 367         mutex_unlock(&file->mut);
 368         return ret;
 369 }
 370
 371 static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
 372 {
 373         switch (cmd->ps) {
 374         case RDMA_PS_TCP:
 375                 *qp_type = IB_QPT_RC;
 376                 return 0;
 377         case RDMA_PS_UDP:
 378         case RDMA_PS_IPOIB:
 379                 *qp_type = IB_QPT_UD;
 380                 return 0;
 381         case RDMA_PS_IB:
 382                 *qp_type = cmd->qp_type;
 383                 return 0;
 384         default:
 385                 return -EINVAL;
 386         }
 387 }
 388
 389 static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
 390                               int in_len, int out_len)
 391 {
 392         struct rdma_ucm_create_id cmd;
 393         struct rdma_ucm_create_id_resp resp;
 394         struct ucma_context *ctx;
 395         enum ib_qp_type qp_type;
 396         int ret;
 397
 398         if (out_len < sizeof(resp))
 399                 return -ENOSPC;
 400
 401         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 402                 return -EFAULT;
 403
 404         ret = ucma_get_qp_type(&cmd, &qp_type);
 405         if (ret)
 406                 return ret;
 407
 408         mutex_lock(&file->mut);
 409         ctx = ucma_alloc_ctx(file);
 410         mutex_unlock(&file->mut);
 411         if (!ctx)
 412                 return -ENOMEM;
 413
 414         ctx->uid = cmd.uid;
 415         ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps, qp_type);
 416         if (IS_ERR(ctx->cm_id)) {
 417                 ret = PTR_ERR(ctx->cm_id);
 418                 goto err1;
 419         }
 420
 421         resp.id = ctx->id;
 422         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 423                          &resp, sizeof(resp))) {
 424                 ret = -EFAULT;
 425                 goto err2;
 426         }
 427         return 0;
 428
 429 err2:
 430         rdma_destroy_id(ctx->cm_id);
 431 err1:
 432         mutex_lock(&mut);
 433         idr_remove(&ctx_idr, ctx->id);
 434         mutex_unlock(&mut);
 435         kfree(ctx);
 436         return ret;
 437 }
 438
 439 static void ucma_cleanup_multicast(struct ucma_context *ctx)
 440 {
 441         struct ucma_multicast *mc, *tmp;
 442
 443         mutex_lock(&mut);
 444         list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
 445                 list_del(&mc->list);
 446                 idr_remove(&multicast_idr, mc->id);
 447                 kfree(mc);
 448         }
 449         mutex_unlock(&mut);
 450 }
 451
 452 static void ucma_cleanup_events(struct ucma_context *ctx)
 453 {
 454         struct ucma_event *uevent, *tmp;
 455
 456         list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
 457                 if (uevent->ctx != ctx)
 458                         continue;
 459
 460                 list_del(&uevent->list);
 461
 462                 /* clear incoming connections. */
 463                 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
 464                         rdma_destroy_id(uevent->cm_id);
 465
 466                 kfree(uevent);
 467         }
 468 }
 469
 470 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
 471 {
 472         struct ucma_event *uevent, *tmp;
 473
 474         list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
 475                 if (uevent->mc != mc)
 476                         continue;
 477
 478                 list_del(&uevent->list);
 479                 kfree(uevent);
 480         }
 481 }
 482
 483 static int ucma_free_ctx(struct ucma_context *ctx)
 484 {
 485         int events_reported;
 486
 487         /* No new events will be generated after destroying the id. */
 488         rdma_destroy_id(ctx->cm_id);
 489
 490         ucma_cleanup_multicast(ctx);
 491
 492         /* Cleanup events not yet reported to the user. */
 493         mutex_lock(&ctx->file->mut);
 494         ucma_cleanup_events(ctx);
 495         list_del(&ctx->list);
 496         mutex_unlock(&ctx->file->mut);
 497
 498         events_reported = ctx->events_reported;
 499         kfree(ctx);
 500         return events_reported;
 501 }
 502
 503 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
 504                                int in_len, int out_len)
 505 {
 506         struct rdma_ucm_destroy_id cmd;
 507         struct rdma_ucm_destroy_id_resp resp;
 508         struct ucma_context *ctx;
 509         int ret = 0;
 510
 511         if (out_len < sizeof(resp))
 512                 return -ENOSPC;
 513
 514         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 515                 return -EFAULT;
 516
 517         mutex_lock(&mut);
 518         ctx = _ucma_find_context(cmd.id, file);
 519         if (!IS_ERR(ctx))
 520                 idr_remove(&ctx_idr, ctx->id);
 521         mutex_unlock(&mut);
 522
 523         if (IS_ERR(ctx))
 524                 return PTR_ERR(ctx);
 525
 526         ucma_put_ctx(ctx);
 527         wait_for_completion(&ctx->comp);
 528         resp.events_reported = ucma_free_ctx(ctx);
 529
 530         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 531                          &resp, sizeof(resp)))
 532                 ret = -EFAULT;
 533
 534         return ret;
 535 }
 536
 537 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
 538                               int in_len, int out_len)
 539 {
 540         struct rdma_ucm_bind_addr cmd;
 541         struct ucma_context *ctx;
 542         int ret;
 543
 544         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 545                 return -EFAULT;
 546
 547         ctx = ucma_get_ctx(file, cmd.id);
 548         if (IS_ERR(ctx))
 549                 return PTR_ERR(ctx);
 550
 551         ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
 552         ucma_put_ctx(ctx);
 553         return ret;
 554 }
 555
 556 static ssize_t ucma_resolve_addr(struct ucma_file *file,
 557                                  const char __user *inbuf,
 558                                  int in_len, int out_len)
 559 {
 560         struct rdma_ucm_resolve_addr cmd;
 561         struct ucma_context *ctx;
 562         int ret;
 563
 564         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 565                 return -EFAULT;
 566
 567         ctx = ucma_get_ctx(file, cmd.id);
 568         if (IS_ERR(ctx))
 569                 return PTR_ERR(ctx);
 570
 571         ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
 572                                 (struct sockaddr *) &cmd.dst_addr,
 573                                 cmd.timeout_ms);
 574         ucma_put_ctx(ctx);
 575         return ret;
 576 }
 577
 578 static ssize_t ucma_resolve_route(struct ucma_file *file,
 579                                   const char __user *inbuf,
 580                                   int in_len, int out_len)
 581 {
 582         struct rdma_ucm_resolve_route cmd;
 583         struct ucma_context *ctx;
 584         int ret;
 585
 586         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 587                 return -EFAULT;
 588
 589         ctx = ucma_get_ctx(file, cmd.id);
 590         if (IS_ERR(ctx))
 591                 return PTR_ERR(ctx);
 592
 593         ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
 594         ucma_put_ctx(ctx);
 595         return ret;
 596 }
 597
 598 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
 599                                struct rdma_route *route)
 600 {
 601         struct rdma_dev_addr *dev_addr;
 602
 603         resp->num_paths = route->num_paths;
 604         switch (route->num_paths) {
 605         case 0:
 606                 dev_addr = &route->addr.dev_addr;
 607                 rdma_addr_get_dgid(dev_addr,
 608                                    (union ib_gid *) &resp->ib_route[0].dgid);
 609                 rdma_addr_get_sgid(dev_addr,
 610                                    (union ib_gid *) &resp->ib_route[0].sgid);
 611                 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
 612                 break;
 613         case 2:
 614                 ib_copy_path_rec_to_user(&resp->ib_route[1],
 615                                          &route->path_rec[1]);
 616                 /* fall through */
 617         case 1:
 618                 ib_copy_path_rec_to_user(&resp->ib_route[0],
 619                                          &route->path_rec[0]);
 620                 break;
 621         default:
 622                 break;
 623         }
 624 }
 625
 626 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
 627                                  struct rdma_route *route)
 628 {
 629         struct rdma_dev_addr *dev_addr;
 630         struct net_device *dev;
 631         u16 vid = 0;
 632
 633         resp->num_paths = route->num_paths;
 634         switch (route->num_paths) {
 635         case 0:
 636                 dev_addr = &route->addr.dev_addr;
 637                 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
 638                         if (dev) {
 639                                 vid = rdma_vlan_dev_vlan_id(dev);
 640                                 dev_put(dev);
 641                         }
 642
 643                 iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid,
 644                                     dev_addr->dst_dev_addr, vid);
 645                 iboe_addr_get_sgid(dev_addr,
 646                                    (union ib_gid *) &resp->ib_route[0].sgid);
 647                 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
 648                 break;
 649         case 2:
 650                 ib_copy_path_rec_to_user(&resp->ib_route[1],
 651                                          &route->path_rec[1]);
 652                 /* fall through */
 653         case 1:
 654                 ib_copy_path_rec_to_user(&resp->ib_route[0],
 655                                          &route->path_rec[0]);
 656                 break;
 657         default:
 658                 break;
 659         }
 660 }
 661
 662 static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
 663                                struct rdma_route *route)
 664 {
 665         struct rdma_dev_addr *dev_addr;
 666
 667         dev_addr = &route->addr.dev_addr;
 668         rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
 669         rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
 670 }
 671
 672 static ssize_t ucma_query_route(struct ucma_file *file,
 673                                 const char __user *inbuf,
 674                                 int in_len, int out_len)
 675 {
 676         struct rdma_ucm_query_route cmd;
 677         struct rdma_ucm_query_route_resp resp;
 678         struct ucma_context *ctx;
 679         struct sockaddr *addr;
 680         int ret = 0;
 681
 682         if (out_len < sizeof(resp))
 683                 return -ENOSPC;
 684
 685         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 686                 return -EFAULT;
 687
 688         ctx = ucma_get_ctx(file, cmd.id);
 689         if (IS_ERR(ctx))
 690                 return PTR_ERR(ctx);
 691
 692         memset(&resp, 0, sizeof resp);
 693         addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
 694         memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
 695                                      sizeof(struct sockaddr_in) :
 696                                      sizeof(struct sockaddr_in6));
 697         addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
 698         memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
 699                                      sizeof(struct sockaddr_in) :
 700                                      sizeof(struct sockaddr_in6));
 701         if (!ctx->cm_id->device)
 702                 goto out;
 703
 704         resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
 705         resp.port_num = ctx->cm_id->port_num;
 706         switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
 707         case RDMA_TRANSPORT_IB:
 708                 switch (rdma_port_get_link_layer(ctx->cm_id->device,
 709                         ctx->cm_id->port_num)) {
 710                 case IB_LINK_LAYER_INFINIBAND:
 711                         ucma_copy_ib_route(&resp, &ctx->cm_id->route);
 712                         break;
 713                 case IB_LINK_LAYER_ETHERNET:
 714                         ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
 715                         break;
 716                 default:
 717                         break;
 718                 }
 719                 break;
 720         case RDMA_TRANSPORT_IWARP:
 721                 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
 722                 break;
 723         default:
 724                 break;
 725         }
 726
 727 out:
 728         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 729                          &resp, sizeof(resp)))
 730                 ret = -EFAULT;
 731
 732         ucma_put_ctx(ctx);
 733         return ret;
 734 }
 735
 736 static void ucma_copy_conn_param(struct rdma_conn_param *dst,
 737                                  struct rdma_ucm_conn_param *src)
 738 {
 739         dst->private_data = src->private_data;
 740         dst->private_data_len = src->private_data_len;
 741         dst->responder_resources =src->responder_resources;
 742         dst->initiator_depth = src->initiator_depth;
 743         dst->flow_control = src->flow_control;
 744         dst->retry_count = src->retry_count;
 745         dst->rnr_retry_count = src->rnr_retry_count;
 746         dst->srq = src->srq;
 747         dst->qp_num = src->qp_num;
 748 }
 749
 750 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
 751                             int in_len, int out_len)
 752 {
 753         struct rdma_ucm_connect cmd;
 754         struct rdma_conn_param conn_param;
 755         struct ucma_context *ctx;
 756         int ret;
 757
 758         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 759                 return -EFAULT;
 760
 761         if (!cmd.conn_param.valid)
 762                 return -EINVAL;
 763
 764         ctx = ucma_get_ctx(file, cmd.id);
 765         if (IS_ERR(ctx))
 766                 return PTR_ERR(ctx);
 767
 768         ucma_copy_conn_param(&conn_param, &cmd.conn_param);
 769         ret = rdma_connect(ctx->cm_id, &conn_param);
 770         ucma_put_ctx(ctx);
 771         return ret;
 772 }
 773
 774 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
 775                            int in_len, int out_len)
 776 {
 777         struct rdma_ucm_listen cmd;
 778         struct ucma_context *ctx;
 779         int ret;
 780
 781         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 782                 return -EFAULT;
 783
 784         ctx = ucma_get_ctx(file, cmd.id);
 785         if (IS_ERR(ctx))
 786                 return PTR_ERR(ctx);
 787
 788         ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
 789                        cmd.backlog : max_backlog;
 790         ret = rdma_listen(ctx->cm_id, ctx->backlog);
 791         ucma_put_ctx(ctx);
 792         return ret;
 793 }
 794
 795 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
 796                            int in_len, int out_len)
 797 {
 798         struct rdma_ucm_accept cmd;
 799         struct rdma_conn_param conn_param;
 800         struct ucma_context *ctx;
 801         int ret;
 802
 803         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 804                 return -EFAULT;
 805
 806         ctx = ucma_get_ctx(file, cmd.id);
 807         if (IS_ERR(ctx))
 808                 return PTR_ERR(ctx);
 809
 810         if (cmd.conn_param.valid) {
 811                 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
 812                 mutex_lock(&file->mut);
 813                 ret = rdma_accept(ctx->cm_id, &conn_param);
 814                 if (!ret)
 815                         ctx->uid = cmd.uid;
 816                 mutex_unlock(&file->mut);
 817         } else
 818                 ret = rdma_accept(ctx->cm_id, NULL);
 819
 820         ucma_put_ctx(ctx);
 821         return ret;
 822 }
 823
 824 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
 825                            int in_len, int out_len)
 826 {
 827         struct rdma_ucm_reject cmd;
 828         struct ucma_context *ctx;
 829         int ret;
 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         ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
 839         ucma_put_ctx(ctx);
 840         return ret;
 841 }
 842
 843 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
 844                                int in_len, int out_len)
 845 {
 846         struct rdma_ucm_disconnect cmd;
 847         struct ucma_context *ctx;
 848         int ret;
 849
 850         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 851                 return -EFAULT;
 852
 853         ctx = ucma_get_ctx(file, cmd.id);
 854         if (IS_ERR(ctx))
 855                 return PTR_ERR(ctx);
 856
 857         ret = rdma_disconnect(ctx->cm_id);
 858         ucma_put_ctx(ctx);
 859         return ret;
 860 }
 861
 862 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
 863                                  const char __user *inbuf,
 864                                  int in_len, int out_len)
 865 {
 866         struct rdma_ucm_init_qp_attr cmd;
 867         struct ib_uverbs_qp_attr resp;
 868         struct ucma_context *ctx;
 869         struct ib_qp_attr qp_attr;
 870         int ret;
 871
 872         if (out_len < sizeof(resp))
 873                 return -ENOSPC;
 874
 875         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 876                 return -EFAULT;
 877
 878         ctx = ucma_get_ctx(file, cmd.id);
 879         if (IS_ERR(ctx))
 880                 return PTR_ERR(ctx);
 881
 882         resp.qp_attr_mask = 0;
 883         memset(&qp_attr, 0, sizeof qp_attr);
 884         qp_attr.qp_state = cmd.qp_state;
 885         ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
 886         if (ret)
 887                 goto out;
 888
 889         ib_copy_qp_attr_to_user(&resp, &qp_attr);
 890         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 891                          &resp, sizeof(resp)))
 892                 ret = -EFAULT;
 893
 894 out:
 895         ucma_put_ctx(ctx);
 896         return ret;
 897 }
 898
 899 static int ucma_set_option_id(struct ucma_context *ctx, int optname,
 900                               void *optval, size_t optlen)
 901 {
 902         int ret = 0;
 903
 904         switch (optname) {
 905         case RDMA_OPTION_ID_TOS:
 906                 if (optlen != sizeof(u8)) {
 907                         ret = -EINVAL;
 908                         break;
 909                 }
 910                 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
 911                 break;
 912         case RDMA_OPTION_ID_REUSEADDR:
 913                 if (optlen != sizeof(int)) {
 914                         ret = -EINVAL;
 915                         break;
 916                 }
 917                 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
 918                 break;
 919         default:
 920                 ret = -ENOSYS;
 921         }
 922
 923         return ret;
 924 }
 925
 926 static int ucma_set_ib_path(struct ucma_context *ctx,
 927                             struct ib_path_rec_data *path_data, size_t optlen)
 928 {
 929         struct ib_sa_path_rec sa_path;
 930         struct rdma_cm_event event;
 931         int ret;
 932
 933         if (optlen % sizeof(*path_data))
 934                 return -EINVAL;
 935
 936         for (; optlen; optlen -= sizeof(*path_data), path_data++) {
 937                 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
 938                                          IB_PATH_BIDIRECTIONAL))
 939                         break;
 940         }
 941
 942         if (!optlen)
 943                 return -EINVAL;
 944
 945         ib_sa_unpack_path(path_data->path_rec, &sa_path);
 946         ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
 947         if (ret)
 948                 return ret;
 949
 950         memset(&event, 0, sizeof event);
 951         event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
 952         return ucma_event_handler(ctx->cm_id, &event);
 953 }
 954
 955 static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
 956                               void *optval, size_t optlen)
 957 {
 958         int ret;
 959
 960         switch (optname) {
 961         case RDMA_OPTION_IB_PATH:
 962                 ret = ucma_set_ib_path(ctx, optval, optlen);
 963                 break;
 964         default:
 965                 ret = -ENOSYS;
 966         }
 967
 968         return ret;
 969 }
 970
 971 static int ucma_set_option_level(struct ucma_context *ctx, int level,
 972                                  int optname, void *optval, size_t optlen)
 973 {
 974         int ret;
 975
 976         switch (level) {
 977         case RDMA_OPTION_ID:
 978                 ret = ucma_set_option_id(ctx, optname, optval, optlen);
 979                 break;
 980         case RDMA_OPTION_IB:
 981                 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
 982                 break;
 983         default:
 984                 ret = -ENOSYS;
 985         }
 986
 987         return ret;
 988 }
 989
 990 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
 991                                int in_len, int out_len)
 992 {
 993         struct rdma_ucm_set_option cmd;
 994         struct ucma_context *ctx;
 995         void *optval;
 996         int ret;
 997
 998         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 999                 return -EFAULT;
1000
1001         ctx = ucma_get_ctx(file, cmd.id);
1002         if (IS_ERR(ctx))
1003                 return PTR_ERR(ctx);
1004
1005         optval = kmalloc(cmd.optlen, GFP_KERNEL);
1006         if (!optval) {
1007                 ret = -ENOMEM;
1008                 goto out1;
1009         }
1010
1011         if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval,
1012                            cmd.optlen)) {
1013                 ret = -EFAULT;
1014                 goto out2;
1015         }
1016
1017         ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1018                                     cmd.optlen);
1019 out2:
1020         kfree(optval);
1021 out1:
1022         ucma_put_ctx(ctx);
1023         return ret;
1024 }
1025
1026 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1027                            int in_len, int out_len)
1028 {
1029         struct rdma_ucm_notify cmd;
1030         struct ucma_context *ctx;
1031         int ret;
1032
1033         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1034                 return -EFAULT;
1035
1036         ctx = ucma_get_ctx(file, cmd.id);
1037         if (IS_ERR(ctx))
1038                 return PTR_ERR(ctx);
1039
1040         ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
1041         ucma_put_ctx(ctx);
1042         return ret;
1043 }
1044
1045 static ssize_t ucma_join_multicast(struct ucma_file *file,
1046                                    const char __user *inbuf,
1047                                    int in_len, int out_len)
1048 {
1049         struct rdma_ucm_join_mcast cmd;
1050         struct rdma_ucm_create_id_resp resp;
1051         struct ucma_context *ctx;
1052         struct ucma_multicast *mc;
1053         int ret;
1054
1055         if (out_len < sizeof(resp))
1056                 return -ENOSPC;
1057
1058         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1059                 return -EFAULT;
1060
1061         ctx = ucma_get_ctx(file, cmd.id);
1062         if (IS_ERR(ctx))
1063                 return PTR_ERR(ctx);
1064
1065         mutex_lock(&file->mut);
1066         mc = ucma_alloc_multicast(ctx);
1067         if (!mc) {
1068                 ret = -ENOMEM;
1069                 goto err1;
1070         }
1071
1072         mc->uid = cmd.uid;
1073         memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
1074         ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
1075         if (ret)
1076                 goto err2;
1077
1078         resp.id = mc->id;
1079         if (copy_to_user((void __user *)(unsigned long)cmd.response,
1080                          &resp, sizeof(resp))) {
1081                 ret = -EFAULT;
1082                 goto err3;
1083         }
1084
1085         mutex_unlock(&file->mut);
1086         ucma_put_ctx(ctx);
1087         return 0;
1088
1089 err3:
1090         rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1091         ucma_cleanup_mc_events(mc);
1092 err2:
1093         mutex_lock(&mut);
1094         idr_remove(&multicast_idr, mc->id);
1095         mutex_unlock(&mut);
1096         list_del(&mc->list);
1097         kfree(mc);
1098 err1:
1099         mutex_unlock(&file->mut);
1100         ucma_put_ctx(ctx);
1101         return ret;
1102 }
1103
1104 static ssize_t ucma_leave_multicast(struct ucma_file *file,
1105                                     const char __user *inbuf,
1106                                     int in_len, int out_len)
1107 {
1108         struct rdma_ucm_destroy_id cmd;
1109         struct rdma_ucm_destroy_id_resp resp;
1110         struct ucma_multicast *mc;
1111         int ret = 0;
1112
1113         if (out_len < sizeof(resp))
1114                 return -ENOSPC;
1115
1116         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1117                 return -EFAULT;
1118
1119         mutex_lock(&mut);
1120         mc = idr_find(&multicast_idr, cmd.id);
1121         if (!mc)
1122                 mc = ERR_PTR(-ENOENT);
1123         else if (mc->ctx->file != file)
1124                 mc = ERR_PTR(-EINVAL);
1125         else {
1126                 idr_remove(&multicast_idr, mc->id);
1127                 atomic_inc(&mc->ctx->ref);
1128         }
1129         mutex_unlock(&mut);
1130
1131         if (IS_ERR(mc)) {
1132                 ret = PTR_ERR(mc);
1133                 goto out;
1134         }
1135
1136         rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1137         mutex_lock(&mc->ctx->file->mut);
1138         ucma_cleanup_mc_events(mc);
1139         list_del(&mc->list);
1140         mutex_unlock(&mc->ctx->file->mut);
1141
1142         ucma_put_ctx(mc->ctx);
1143         resp.events_reported = mc->events_reported;
1144         kfree(mc);
1145
1146         if (copy_to_user((void __user *)(unsigned long)cmd.response,
1147                          &resp, sizeof(resp)))
1148                 ret = -EFAULT;
1149 out:
1150         return ret;
1151 }
1152
1153 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1154 {
1155         /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1156         if (file1 < file2) {
1157                 mutex_lock(&file1->mut);
1158                 mutex_lock(&file2->mut);
1159         } else {
1160                 mutex_lock(&file2->mut);
1161                 mutex_lock(&file1->mut);
1162         }
1163 }
1164
1165 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1166 {
1167         if (file1 < file2) {
1168                 mutex_unlock(&file2->mut);
1169                 mutex_unlock(&file1->mut);
1170         } else {
1171                 mutex_unlock(&file1->mut);
1172                 mutex_unlock(&file2->mut);
1173         }
1174 }
1175
1176 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1177 {
1178         struct ucma_event *uevent, *tmp;
1179
1180         list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1181                 if (uevent->ctx == ctx)
1182                         list_move_tail(&uevent->list, &file->event_list);
1183 }
1184
1185 static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1186                                const char __user *inbuf,
1187                                int in_len, int out_len)
1188 {
1189         struct rdma_ucm_migrate_id cmd;
1190         struct rdma_ucm_migrate_resp resp;
1191         struct ucma_context *ctx;
1192         struct file *filp;
1193         struct ucma_file *cur_file;
1194         int ret = 0;
1195
1196         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1197                 return -EFAULT;
1198
1199         /* Get current fd to protect against it being closed */
1200         filp = fget(cmd.fd);
1201         if (!filp)
1202                 return -ENOENT;
1203
1204         /* Validate current fd and prevent destruction of id. */
1205         ctx = ucma_get_ctx(filp->private_data, cmd.id);
1206         if (IS_ERR(ctx)) {
1207                 ret = PTR_ERR(ctx);
1208                 goto file_put;
1209         }
1210
1211         cur_file = ctx->file;
1212         if (cur_file == new_file) {
1213                 resp.events_reported = ctx->events_reported;
1214                 goto response;
1215         }
1216
1217         /*
1218          * Migrate events between fd's, maintaining order, and avoiding new
1219          * events being added before existing events.
1220          */
1221         ucma_lock_files(cur_file, new_file);
1222         mutex_lock(&mut);
1223
1224         list_move_tail(&ctx->list, &new_file->ctx_list);
1225         ucma_move_events(ctx, new_file);
1226         ctx->file = new_file;
1227         resp.events_reported = ctx->events_reported;
1228
1229         mutex_unlock(&mut);
1230         ucma_unlock_files(cur_file, new_file);
1231
1232 response:
1233         if (copy_to_user((void __user *)(unsigned long)cmd.response,
1234                          &resp, sizeof(resp)))
1235                 ret = -EFAULT;
1236
1237         ucma_put_ctx(ctx);
1238 file_put:
1239         fput(filp);
1240         return ret;
1241 }
1242
1243 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1244                                    const char __user *inbuf,
1245                                    int in_len, int out_len) = {
1246         [RDMA_USER_CM_CMD_CREATE_ID]    = ucma_create_id,
1247         [RDMA_USER_CM_CMD_DESTROY_ID]   = ucma_destroy_id,
1248         [RDMA_USER_CM_CMD_BIND_ADDR]    = ucma_bind_addr,
1249         [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1250         [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
1251         [RDMA_USER_CM_CMD_QUERY_ROUTE]  = ucma_query_route,
1252         [RDMA_USER_CM_CMD_CONNECT]      = ucma_connect,
1253         [RDMA_USER_CM_CMD_LISTEN]       = ucma_listen,
1254         [RDMA_USER_CM_CMD_ACCEPT]       = ucma_accept,
1255         [RDMA_USER_CM_CMD_REJECT]       = ucma_reject,
1256         [RDMA_USER_CM_CMD_DISCONNECT]   = ucma_disconnect,
1257         [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1258         [RDMA_USER_CM_CMD_GET_EVENT]    = ucma_get_event,
1259         [RDMA_USER_CM_CMD_GET_OPTION]   = NULL,
1260         [RDMA_USER_CM_CMD_SET_OPTION]   = ucma_set_option,
1261         [RDMA_USER_CM_CMD_NOTIFY]       = ucma_notify,
1262         [RDMA_USER_CM_CMD_JOIN_MCAST]   = ucma_join_multicast,
1263         [RDMA_USER_CM_CMD_LEAVE_MCAST]  = ucma_leave_multicast,
1264         [RDMA_USER_CM_CMD_MIGRATE_ID]   = ucma_migrate_id
1265 };
1266
1267 static ssize_t ucma_write(struct file *filp, const char __user *buf,
1268                           size_t len, loff_t *pos)
1269 {
1270         struct ucma_file *file = filp->private_data;
1271         struct rdma_ucm_cmd_hdr hdr;
1272         ssize_t ret;
1273
1274         if (len < sizeof(hdr))
1275                 return -EINVAL;
1276
1277         if (copy_from_user(&hdr, buf, sizeof(hdr)))
1278                 return -EFAULT;
1279
1280         if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1281                 return -EINVAL;
1282
1283         if (hdr.in + sizeof(hdr) > len)
1284                 return -EINVAL;
1285
1286         if (!ucma_cmd_table[hdr.cmd])
1287                 return -ENOSYS;
1288
1289         ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1290         if (!ret)
1291                 ret = len;
1292
1293         return ret;
1294 }
1295
1296 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1297 {
1298         struct ucma_file *file = filp->private_data;
1299         unsigned int mask = 0;
1300
1301         poll_wait(filp, &file->poll_wait, wait);
1302
1303         if (!list_empty(&file->event_list))
1304                 mask = POLLIN | POLLRDNORM;
1305
1306         return mask;
1307 }
1308
1309 /*
1310  * ucma_open() does not need the BKL:
1311  *
1312  *  - no global state is referred to;
1313  *  - there is no ioctl method to race against;
1314  *  - no further module initialization is required for open to work
1315  *    after the device is registered.
1316  */
1317 static int ucma_open(struct inode *inode, struct file *filp)
1318 {
1319         struct ucma_file *file;
1320
1321         file = kmalloc(sizeof *file, GFP_KERNEL);
1322         if (!file)
1323                 return -ENOMEM;
1324
1325         INIT_LIST_HEAD(&file->event_list);
1326         INIT_LIST_HEAD(&file->ctx_list);
1327         init_waitqueue_head(&file->poll_wait);
1328         mutex_init(&file->mut);
1329
1330         filp->private_data = file;
1331         file->filp = filp;
1332
1333         return nonseekable_open(inode, filp);
1334 }
1335
1336 static int ucma_close(struct inode *inode, struct file *filp)
1337 {
1338         struct ucma_file *file = filp->private_data;
1339         struct ucma_context *ctx, *tmp;
1340
1341         mutex_lock(&file->mut);
1342         list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1343                 mutex_unlock(&file->mut);
1344
1345                 mutex_lock(&mut);
1346                 idr_remove(&ctx_idr, ctx->id);
1347                 mutex_unlock(&mut);
1348
1349                 ucma_free_ctx(ctx);
1350                 mutex_lock(&file->mut);
1351         }
1352         mutex_unlock(&file->mut);
1353         kfree(file);
1354         return 0;
1355 }
1356
1357 static const struct file_operations ucma_fops = {
1358         .owner   = THIS_MODULE,
1359         .open    = ucma_open,
1360         .release = ucma_close,
1361         .write   = ucma_write,
1362         .poll    = ucma_poll,
1363         .llseek  = no_llseek,
1364 };
1365
1366 static struct miscdevice ucma_misc = {
1367         .minor          = MISC_DYNAMIC_MINOR,
1368         .name           = "rdma_cm",
1369         .nodename       = "infiniband/rdma_cm",
1370         .mode           = 0666,
1371         .fops           = &ucma_fops,
1372 };
1373
1374 static ssize_t show_abi_version(struct device *dev,
1375                                 struct device_attribute *attr,
1376                                 char *buf)
1377 {
1378         return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1379 }
1380 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1381
1382 static int __init ucma_init(void)
1383 {
1384         int ret;
1385
1386         ret = misc_register(&ucma_misc);
1387         if (ret)
1388                 return ret;
1389
1390         ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1391         if (ret) {
1392                 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1393                 goto err1;
1394         }
1395
1396         ucma_ctl_table_hdr = register_sysctl_paths(ucma_ctl_path, ucma_ctl_table);
1397         if (!ucma_ctl_table_hdr) {
1398                 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n");
1399                 ret = -ENOMEM;
1400                 goto err2;
1401         }
1402         return 0;
1403 err2:
1404         device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1405 err1:
1406         misc_deregister(&ucma_misc);
1407         return ret;
1408 }
1409
1410 static void __exit ucma_cleanup(void)
1411 {
1412         unregister_sysctl_table(ucma_ctl_table_hdr);
1413         device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1414         misc_deregister(&ucma_misc);
1415         idr_destroy(&ctx_idr);
1416 }
1417
1418 module_init(ucma_init);
1419 module_exit(ucma_cleanup);