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 struct ucma_file {
  70         struct mutex            mut;
  71         struct file             *filp;
  72         struct list_head        ctx_list;
  73         struct list_head        event_list;
  74         wait_queue_head_t       poll_wait;
  75 };
  76
  77 struct ucma_context {
  78         int                     id;
  79         struct completion       comp;
  80         atomic_t                ref;
  81         int                     events_reported;
  82         int                     backlog;
  83
  84         struct ucma_file        *file;
  85         struct rdma_cm_id       *cm_id;
  86         u64                     uid;
  87
  88         struct list_head        list;
  89         struct list_head        mc_list;
  90 };
  91
  92 struct ucma_multicast {
  93         struct ucma_context     *ctx;
  94         int                     id;
  95         int                     events_reported;
  96
  97         u64                     uid;
  98         struct list_head        list;
  99         struct sockaddr_storage addr;
 100 };
 101
 102 struct ucma_event {
 103         struct ucma_context     *ctx;
 104         struct ucma_multicast   *mc;
 105         struct list_head        list;
 106         struct rdma_cm_id       *cm_id;
 107         struct rdma_ucm_event_resp resp;
 108 };
 109
 110 static DEFINE_MUTEX(mut);
 111 static DEFINE_IDR(ctx_idr);
 112 static DEFINE_IDR(multicast_idr);
 113
 114 static inline struct ucma_context *_ucma_find_context(int id,
 115                                                       struct ucma_file *file)
 116 {
 117         struct ucma_context *ctx;
 118
 119         ctx = idr_find(&ctx_idr, id);
 120         if (!ctx)
 121                 ctx = ERR_PTR(-ENOENT);
 122         else if (ctx->file != file)
 123                 ctx = ERR_PTR(-EINVAL);
 124         return ctx;
 125 }
 126
 127 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
 128 {
 129         struct ucma_context *ctx;
 130
 131         mutex_lock(&mut);
 132         ctx = _ucma_find_context(id, file);
 133         if (!IS_ERR(ctx))
 134                 atomic_inc(&ctx->ref);
 135         mutex_unlock(&mut);
 136         return ctx;
 137 }
 138
 139 static void ucma_put_ctx(struct ucma_context *ctx)
 140 {
 141         if (atomic_dec_and_test(&ctx->ref))
 142                 complete(&ctx->comp);
 143 }
 144
 145 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
 146 {
 147         struct ucma_context *ctx;
 148         int ret;
 149
 150         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 151         if (!ctx)
 152                 return NULL;
 153
 154         atomic_set(&ctx->ref, 1);
 155         init_completion(&ctx->comp);
 156         INIT_LIST_HEAD(&ctx->mc_list);
 157         ctx->file = file;
 158
 159         do {
 160                 ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
 161                 if (!ret)
 162                         goto error;
 163
 164                 mutex_lock(&mut);
 165                 ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
 166                 mutex_unlock(&mut);
 167         } while (ret == -EAGAIN);
 168
 169         if (ret)
 170                 goto error;
 171
 172         list_add_tail(&ctx->list, &file->ctx_list);
 173         return ctx;
 174
 175 error:
 176         kfree(ctx);
 177         return NULL;
 178 }
 179
 180 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
 181 {
 182         struct ucma_multicast *mc;
 183         int ret;
 184
 185         mc = kzalloc(sizeof(*mc), GFP_KERNEL);
 186         if (!mc)
 187                 return NULL;
 188
 189         do {
 190                 ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
 191                 if (!ret)
 192                         goto error;
 193
 194                 mutex_lock(&mut);
 195                 ret = idr_get_new(&multicast_idr, mc, &mc->id);
 196                 mutex_unlock(&mut);
 197         } while (ret == -EAGAIN);
 198
 199         if (ret)
 200                 goto error;
 201
 202         mc->ctx = ctx;
 203         list_add_tail(&mc->list, &ctx->mc_list);
 204         return mc;
 205
 206 error:
 207         kfree(mc);
 208         return NULL;
 209 }
 210
 211 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
 212                                  struct rdma_conn_param *src)
 213 {
 214         if (src->private_data_len)
 215                 memcpy(dst->private_data, src->private_data,
 216                        src->private_data_len);
 217         dst->private_data_len = src->private_data_len;
 218         dst->responder_resources =src->responder_resources;
 219         dst->initiator_depth = src->initiator_depth;
 220         dst->flow_control = src->flow_control;
 221         dst->retry_count = src->retry_count;
 222         dst->rnr_retry_count = src->rnr_retry_count;
 223         dst->srq = src->srq;
 224         dst->qp_num = src->qp_num;
 225 }
 226
 227 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
 228                                struct rdma_ud_param *src)
 229 {
 230         if (src->private_data_len)
 231                 memcpy(dst->private_data, src->private_data,
 232                        src->private_data_len);
 233         dst->private_data_len = src->private_data_len;
 234         ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
 235         dst->qp_num = src->qp_num;
 236         dst->qkey = src->qkey;
 237 }
 238
 239 static void ucma_set_event_context(struct ucma_context *ctx,
 240                                    struct rdma_cm_event *event,
 241                                    struct ucma_event *uevent)
 242 {
 243         uevent->ctx = ctx;
 244         switch (event->event) {
 245         case RDMA_CM_EVENT_MULTICAST_JOIN:
 246         case RDMA_CM_EVENT_MULTICAST_ERROR:
 247                 uevent->mc = (struct ucma_multicast *)
 248                              event->param.ud.private_data;
 249                 uevent->resp.uid = uevent->mc->uid;
 250                 uevent->resp.id = uevent->mc->id;
 251                 break;
 252         default:
 253                 uevent->resp.uid = ctx->uid;
 254                 uevent->resp.id = ctx->id;
 255                 break;
 256         }
 257 }
 258
 259 static int ucma_event_handler(struct rdma_cm_id *cm_id,
 260                               struct rdma_cm_event *event)
 261 {
 262         struct ucma_event *uevent;
 263         struct ucma_context *ctx = cm_id->context;
 264         int ret = 0;
 265
 266         uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
 267         if (!uevent)
 268                 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
 269
 270         mutex_lock(&ctx->file->mut);
 271         uevent->cm_id = cm_id;
 272         ucma_set_event_context(ctx, event, uevent);
 273         uevent->resp.event = event->event;
 274         uevent->resp.status = event->status;
 275         if (cm_id->qp_type == IB_QPT_UD)
 276                 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
 277         else
 278                 ucma_copy_conn_event(&uevent->resp.param.conn,
 279                                      &event->param.conn);
 280
 281         if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
 282                 if (!ctx->backlog) {
 283                         ret = -ENOMEM;
 284                         kfree(uevent);
 285                         goto out;
 286                 }
 287                 ctx->backlog--;
 288         } else if (!ctx->uid) {
 289                 /*
 290                  * We ignore events for new connections until userspace has set
 291                  * their context.  This can only happen if an error occurs on a
 292                  * new connection before the user accepts it.  This is okay,
 293                  * since the accept will just fail later.
 294                  */
 295                 kfree(uevent);
 296                 goto out;
 297         }
 298
 299         list_add_tail(&uevent->list, &ctx->file->event_list);
 300         wake_up_interruptible(&ctx->file->poll_wait);
 301 out:
 302         mutex_unlock(&ctx->file->mut);
 303         return ret;
 304 }
 305
 306 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
 307                               int in_len, int out_len)
 308 {
 309         struct ucma_context *ctx;
 310         struct rdma_ucm_get_event cmd;
 311         struct ucma_event *uevent;
 312         int ret = 0;
 313         DEFINE_WAIT(wait);
 314
 315         if (out_len < sizeof uevent->resp)
 316                 return -ENOSPC;
 317
 318         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 319                 return -EFAULT;
 320
 321         mutex_lock(&file->mut);
 322         while (list_empty(&file->event_list)) {
 323                 mutex_unlock(&file->mut);
 324
 325                 if (file->filp->f_flags & O_NONBLOCK)
 326                         return -EAGAIN;
 327
 328                 if (wait_event_interruptible(file->poll_wait,
 329                                              !list_empty(&file->event_list)))
 330                         return -ERESTARTSYS;
 331
 332                 mutex_lock(&file->mut);
 333         }
 334
 335         uevent = list_entry(file->event_list.next, struct ucma_event, list);
 336
 337         if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
 338                 ctx = ucma_alloc_ctx(file);
 339                 if (!ctx) {
 340                         ret = -ENOMEM;
 341                         goto done;
 342                 }
 343                 uevent->ctx->backlog++;
 344                 ctx->cm_id = uevent->cm_id;
 345                 ctx->cm_id->context = ctx;
 346                 uevent->resp.id = ctx->id;
 347         }
 348
 349         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 350                          &uevent->resp, sizeof uevent->resp)) {
 351                 ret = -EFAULT;
 352                 goto done;
 353         }
 354
 355         list_del(&uevent->list);
 356         uevent->ctx->events_reported++;
 357         if (uevent->mc)
 358                 uevent->mc->events_reported++;
 359         kfree(uevent);
 360 done:
 361         mutex_unlock(&file->mut);
 362         return ret;
 363 }
 364
 365 static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
 366 {
 367         switch (cmd->ps) {
 368         case RDMA_PS_TCP:
 369                 *qp_type = IB_QPT_RC;
 370                 return 0;
 371         case RDMA_PS_UDP:
 372         case RDMA_PS_IPOIB:
 373                 *qp_type = IB_QPT_UD;
 374                 return 0;
 375         case RDMA_PS_IB:
 376                 *qp_type = cmd->qp_type;
 377                 return 0;
 378         default:
 379                 return -EINVAL;
 380         }
 381 }
 382
 383 static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
 384                               int in_len, int out_len)
 385 {
 386         struct rdma_ucm_create_id cmd;
 387         struct rdma_ucm_create_id_resp resp;
 388         struct ucma_context *ctx;
 389         enum ib_qp_type qp_type;
 390         int ret;
 391
 392         if (out_len < sizeof(resp))
 393                 return -ENOSPC;
 394
 395         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 396                 return -EFAULT;
 397
 398         ret = ucma_get_qp_type(&cmd, &qp_type);
 399         if (ret)
 400                 return ret;
 401
 402         mutex_lock(&file->mut);
 403         ctx = ucma_alloc_ctx(file);
 404         mutex_unlock(&file->mut);
 405         if (!ctx)
 406                 return -ENOMEM;
 407
 408         ctx->uid = cmd.uid;
 409         ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps, qp_type);
 410         if (IS_ERR(ctx->cm_id)) {
 411                 ret = PTR_ERR(ctx->cm_id);
 412                 goto err1;
 413         }
 414
 415         resp.id = ctx->id;
 416         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 417                          &resp, sizeof(resp))) {
 418                 ret = -EFAULT;
 419                 goto err2;
 420         }
 421         return 0;
 422
 423 err2:
 424         rdma_destroy_id(ctx->cm_id);
 425 err1:
 426         mutex_lock(&mut);
 427         idr_remove(&ctx_idr, ctx->id);
 428         mutex_unlock(&mut);
 429         kfree(ctx);
 430         return ret;
 431 }
 432
 433 static void ucma_cleanup_multicast(struct ucma_context *ctx)
 434 {
 435         struct ucma_multicast *mc, *tmp;
 436
 437         mutex_lock(&mut);
 438         list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
 439                 list_del(&mc->list);
 440                 idr_remove(&multicast_idr, mc->id);
 441                 kfree(mc);
 442         }
 443         mutex_unlock(&mut);
 444 }
 445
 446 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
 447 {
 448         struct ucma_event *uevent, *tmp;
 449
 450         list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
 451                 if (uevent->mc != mc)
 452                         continue;
 453
 454                 list_del(&uevent->list);
 455                 kfree(uevent);
 456         }
 457 }
 458
 459 /*
 460  * We cannot hold file->mut when calling rdma_destroy_id() or we can
 461  * deadlock.  We also acquire file->mut in ucma_event_handler(), and
 462  * rdma_destroy_id() will wait until all callbacks have completed.
 463  */
 464 static int ucma_free_ctx(struct ucma_context *ctx)
 465 {
 466         int events_reported;
 467         struct ucma_event *uevent, *tmp;
 468         LIST_HEAD(list);
 469
 470         /* No new events will be generated after destroying the id. */
 471         rdma_destroy_id(ctx->cm_id);
 472
 473         ucma_cleanup_multicast(ctx);
 474
 475         /* Cleanup events not yet reported to the user. */
 476         mutex_lock(&ctx->file->mut);
 477         list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
 478                 if (uevent->ctx == ctx)
 479                         list_move_tail(&uevent->list, &list);
 480         }
 481         list_del(&ctx->list);
 482         mutex_unlock(&ctx->file->mut);
 483
 484         list_for_each_entry_safe(uevent, tmp, &list, list) {
 485                 list_del(&uevent->list);
 486                 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
 487                         rdma_destroy_id(uevent->cm_id);
 488                 kfree(uevent);
 489         }
 490
 491         events_reported = ctx->events_reported;
 492         kfree(ctx);
 493         return events_reported;
 494 }
 495
 496 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
 497                                int in_len, int out_len)
 498 {
 499         struct rdma_ucm_destroy_id cmd;
 500         struct rdma_ucm_destroy_id_resp resp;
 501         struct ucma_context *ctx;
 502         int ret = 0;
 503
 504         if (out_len < sizeof(resp))
 505                 return -ENOSPC;
 506
 507         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 508                 return -EFAULT;
 509
 510         mutex_lock(&mut);
 511         ctx = _ucma_find_context(cmd.id, file);
 512         if (!IS_ERR(ctx))
 513                 idr_remove(&ctx_idr, ctx->id);
 514         mutex_unlock(&mut);
 515
 516         if (IS_ERR(ctx))
 517                 return PTR_ERR(ctx);
 518
 519         ucma_put_ctx(ctx);
 520         wait_for_completion(&ctx->comp);
 521         resp.events_reported = ucma_free_ctx(ctx);
 522
 523         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 524                          &resp, sizeof(resp)))
 525                 ret = -EFAULT;
 526
 527         return ret;
 528 }
 529
 530 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
 531                               int in_len, int out_len)
 532 {
 533         struct rdma_ucm_bind_addr cmd;
 534         struct ucma_context *ctx;
 535         int ret;
 536
 537         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 538                 return -EFAULT;
 539
 540         ctx = ucma_get_ctx(file, cmd.id);
 541         if (IS_ERR(ctx))
 542                 return PTR_ERR(ctx);
 543
 544         ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
 545         ucma_put_ctx(ctx);
 546         return ret;
 547 }
 548
 549 static ssize_t ucma_resolve_addr(struct ucma_file *file,
 550                                  const char __user *inbuf,
 551                                  int in_len, int out_len)
 552 {
 553         struct rdma_ucm_resolve_addr cmd;
 554         struct ucma_context *ctx;
 555         int ret;
 556
 557         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 558                 return -EFAULT;
 559
 560         ctx = ucma_get_ctx(file, cmd.id);
 561         if (IS_ERR(ctx))
 562                 return PTR_ERR(ctx);
 563
 564         ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
 565                                 (struct sockaddr *) &cmd.dst_addr,
 566                                 cmd.timeout_ms);
 567         ucma_put_ctx(ctx);
 568         return ret;
 569 }
 570
 571 static ssize_t ucma_resolve_route(struct ucma_file *file,
 572                                   const char __user *inbuf,
 573                                   int in_len, int out_len)
 574 {
 575         struct rdma_ucm_resolve_route cmd;
 576         struct ucma_context *ctx;
 577         int ret;
 578
 579         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 580                 return -EFAULT;
 581
 582         ctx = ucma_get_ctx(file, cmd.id);
 583         if (IS_ERR(ctx))
 584                 return PTR_ERR(ctx);
 585
 586         ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
 587         ucma_put_ctx(ctx);
 588         return ret;
 589 }
 590
 591 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
 592                                struct rdma_route *route)
 593 {
 594         struct rdma_dev_addr *dev_addr;
 595
 596         resp->num_paths = route->num_paths;
 597         switch (route->num_paths) {
 598         case 0:
 599                 dev_addr = &route->addr.dev_addr;
 600                 rdma_addr_get_dgid(dev_addr,
 601                                    (union ib_gid *) &resp->ib_route[0].dgid);
 602                 rdma_addr_get_sgid(dev_addr,
 603                                    (union ib_gid *) &resp->ib_route[0].sgid);
 604                 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
 605                 break;
 606         case 2:
 607                 ib_copy_path_rec_to_user(&resp->ib_route[1],
 608                                          &route->path_rec[1]);
 609                 /* fall through */
 610         case 1:
 611                 ib_copy_path_rec_to_user(&resp->ib_route[0],
 612                                          &route->path_rec[0]);
 613                 break;
 614         default:
 615                 break;
 616         }
 617 }
 618
 619 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
 620                                  struct rdma_route *route)
 621 {
 622         struct rdma_dev_addr *dev_addr;
 623         struct net_device *dev;
 624         u16 vid = 0;
 625
 626         resp->num_paths = route->num_paths;
 627         switch (route->num_paths) {
 628         case 0:
 629                 dev_addr = &route->addr.dev_addr;
 630                 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
 631                         if (dev) {
 632                                 vid = rdma_vlan_dev_vlan_id(dev);
 633                                 dev_put(dev);
 634                         }
 635
 636                 iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid,
 637                                     dev_addr->dst_dev_addr, vid);
 638                 iboe_addr_get_sgid(dev_addr,
 639                                    (union ib_gid *) &resp->ib_route[0].sgid);
 640                 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
 641                 break;
 642         case 2:
 643                 ib_copy_path_rec_to_user(&resp->ib_route[1],
 644                                          &route->path_rec[1]);
 645                 /* fall through */
 646         case 1:
 647                 ib_copy_path_rec_to_user(&resp->ib_route[0],
 648                                          &route->path_rec[0]);
 649                 break;
 650         default:
 651                 break;
 652         }
 653 }
 654
 655 static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
 656                                struct rdma_route *route)
 657 {
 658         struct rdma_dev_addr *dev_addr;
 659
 660         dev_addr = &route->addr.dev_addr;
 661         rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
 662         rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
 663 }
 664
 665 static ssize_t ucma_query_route(struct ucma_file *file,
 666                                 const char __user *inbuf,
 667                                 int in_len, int out_len)
 668 {
 669         struct rdma_ucm_query_route cmd;
 670         struct rdma_ucm_query_route_resp resp;
 671         struct ucma_context *ctx;
 672         struct sockaddr *addr;
 673         int ret = 0;
 674
 675         if (out_len < sizeof(resp))
 676                 return -ENOSPC;
 677
 678         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 679                 return -EFAULT;
 680
 681         ctx = ucma_get_ctx(file, cmd.id);
 682         if (IS_ERR(ctx))
 683                 return PTR_ERR(ctx);
 684
 685         memset(&resp, 0, sizeof resp);
 686         addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
 687         memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
 688                                      sizeof(struct sockaddr_in) :
 689                                      sizeof(struct sockaddr_in6));
 690         addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
 691         memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
 692                                      sizeof(struct sockaddr_in) :
 693                                      sizeof(struct sockaddr_in6));
 694         if (!ctx->cm_id->device)
 695                 goto out;
 696
 697         resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
 698         resp.port_num = ctx->cm_id->port_num;
 699         switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
 700         case RDMA_TRANSPORT_IB:
 701                 switch (rdma_port_get_link_layer(ctx->cm_id->device,
 702                         ctx->cm_id->port_num)) {
 703                 case IB_LINK_LAYER_INFINIBAND:
 704                         ucma_copy_ib_route(&resp, &ctx->cm_id->route);
 705                         break;
 706                 case IB_LINK_LAYER_ETHERNET:
 707                         ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
 708                         break;
 709                 default:
 710                         break;
 711                 }
 712                 break;
 713         case RDMA_TRANSPORT_IWARP:
 714                 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
 715                 break;
 716         default:
 717                 break;
 718         }
 719
 720 out:
 721         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 722                          &resp, sizeof(resp)))
 723                 ret = -EFAULT;
 724
 725         ucma_put_ctx(ctx);
 726         return ret;
 727 }
 728
 729 static void ucma_copy_conn_param(struct rdma_conn_param *dst,
 730                                  struct rdma_ucm_conn_param *src)
 731 {
 732         dst->private_data = src->private_data;
 733         dst->private_data_len = src->private_data_len;
 734         dst->responder_resources =src->responder_resources;
 735         dst->initiator_depth = src->initiator_depth;
 736         dst->flow_control = src->flow_control;
 737         dst->retry_count = src->retry_count;
 738         dst->rnr_retry_count = src->rnr_retry_count;
 739         dst->srq = src->srq;
 740         dst->qp_num = src->qp_num;
 741 }
 742
 743 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
 744                             int in_len, int out_len)
 745 {
 746         struct rdma_ucm_connect cmd;
 747         struct rdma_conn_param conn_param;
 748         struct ucma_context *ctx;
 749         int ret;
 750
 751         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 752                 return -EFAULT;
 753
 754         if (!cmd.conn_param.valid)
 755                 return -EINVAL;
 756
 757         ctx = ucma_get_ctx(file, cmd.id);
 758         if (IS_ERR(ctx))
 759                 return PTR_ERR(ctx);
 760
 761         ucma_copy_conn_param(&conn_param, &cmd.conn_param);
 762         ret = rdma_connect(ctx->cm_id, &conn_param);
 763         ucma_put_ctx(ctx);
 764         return ret;
 765 }
 766
 767 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
 768                            int in_len, int out_len)
 769 {
 770         struct rdma_ucm_listen cmd;
 771         struct ucma_context *ctx;
 772         int ret;
 773
 774         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 775                 return -EFAULT;
 776
 777         ctx = ucma_get_ctx(file, cmd.id);
 778         if (IS_ERR(ctx))
 779                 return PTR_ERR(ctx);
 780
 781         ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
 782                        cmd.backlog : max_backlog;
 783         ret = rdma_listen(ctx->cm_id, ctx->backlog);
 784         ucma_put_ctx(ctx);
 785         return ret;
 786 }
 787
 788 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
 789                            int in_len, int out_len)
 790 {
 791         struct rdma_ucm_accept cmd;
 792         struct rdma_conn_param conn_param;
 793         struct ucma_context *ctx;
 794         int ret;
 795
 796         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 797                 return -EFAULT;
 798
 799         ctx = ucma_get_ctx(file, cmd.id);
 800         if (IS_ERR(ctx))
 801                 return PTR_ERR(ctx);
 802
 803         if (cmd.conn_param.valid) {
 804                 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
 805                 mutex_lock(&file->mut);
 806                 ret = rdma_accept(ctx->cm_id, &conn_param);
 807                 if (!ret)
 808                         ctx->uid = cmd.uid;
 809                 mutex_unlock(&file->mut);
 810         } else
 811                 ret = rdma_accept(ctx->cm_id, NULL);
 812
 813         ucma_put_ctx(ctx);
 814         return ret;
 815 }
 816
 817 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
 818                            int in_len, int out_len)
 819 {
 820         struct rdma_ucm_reject cmd;
 821         struct ucma_context *ctx;
 822         int ret;
 823
 824         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 825                 return -EFAULT;
 826
 827         ctx = ucma_get_ctx(file, cmd.id);
 828         if (IS_ERR(ctx))
 829                 return PTR_ERR(ctx);
 830
 831         ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
 832         ucma_put_ctx(ctx);
 833         return ret;
 834 }
 835
 836 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
 837                                int in_len, int out_len)
 838 {
 839         struct rdma_ucm_disconnect cmd;
 840         struct ucma_context *ctx;
 841         int ret;
 842
 843         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 844                 return -EFAULT;
 845
 846         ctx = ucma_get_ctx(file, cmd.id);
 847         if (IS_ERR(ctx))
 848                 return PTR_ERR(ctx);
 849
 850         ret = rdma_disconnect(ctx->cm_id);
 851         ucma_put_ctx(ctx);
 852         return ret;
 853 }
 854
 855 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
 856                                  const char __user *inbuf,
 857                                  int in_len, int out_len)
 858 {
 859         struct rdma_ucm_init_qp_attr cmd;
 860         struct ib_uverbs_qp_attr resp;
 861         struct ucma_context *ctx;
 862         struct ib_qp_attr qp_attr;
 863         int ret;
 864
 865         if (out_len < sizeof(resp))
 866                 return -ENOSPC;
 867
 868         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 869                 return -EFAULT;
 870
 871         ctx = ucma_get_ctx(file, cmd.id);
 872         if (IS_ERR(ctx))
 873                 return PTR_ERR(ctx);
 874
 875         resp.qp_attr_mask = 0;
 876         memset(&qp_attr, 0, sizeof qp_attr);
 877         qp_attr.qp_state = cmd.qp_state;
 878         ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
 879         if (ret)
 880                 goto out;
 881
 882         ib_copy_qp_attr_to_user(&resp, &qp_attr);
 883         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 884                          &resp, sizeof(resp)))
 885                 ret = -EFAULT;
 886
 887 out:
 888         ucma_put_ctx(ctx);
 889         return ret;
 890 }
 891
 892 static int ucma_set_option_id(struct ucma_context *ctx, int optname,
 893                               void *optval, size_t optlen)
 894 {
 895         int ret = 0;
 896
 897         switch (optname) {
 898         case RDMA_OPTION_ID_TOS:
 899                 if (optlen != sizeof(u8)) {
 900                         ret = -EINVAL;
 901                         break;
 902                 }
 903                 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
 904                 break;
 905         case RDMA_OPTION_ID_REUSEADDR:
 906                 if (optlen != sizeof(int)) {
 907                         ret = -EINVAL;
 908                         break;
 909                 }
 910                 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
 911                 break;
 912         case RDMA_OPTION_ID_AFONLY:
 913                 if (optlen != sizeof(int)) {
 914                         ret = -EINVAL;
 915                         break;
 916                 }
 917                 ret = rdma_set_afonly(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 = memdup_user((void __user *) (unsigned long) cmd.optval,
1006                              cmd.optlen);
1007         if (IS_ERR(optval)) {
1008                 ret = PTR_ERR(optval);
1009                 goto out;
1010         }
1011
1012         ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1013                                     cmd.optlen);
1014         kfree(optval);
1015
1016 out:
1017         ucma_put_ctx(ctx);
1018         return ret;
1019 }
1020
1021 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1022                            int in_len, int out_len)
1023 {
1024         struct rdma_ucm_notify cmd;
1025         struct ucma_context *ctx;
1026         int ret;
1027
1028         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1029                 return -EFAULT;
1030
1031         ctx = ucma_get_ctx(file, cmd.id);
1032         if (IS_ERR(ctx))
1033                 return PTR_ERR(ctx);
1034
1035         ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
1036         ucma_put_ctx(ctx);
1037         return ret;
1038 }
1039
1040 static ssize_t ucma_join_multicast(struct ucma_file *file,
1041                                    const char __user *inbuf,
1042                                    int in_len, int out_len)
1043 {
1044         struct rdma_ucm_join_mcast cmd;
1045         struct rdma_ucm_create_id_resp resp;
1046         struct ucma_context *ctx;
1047         struct ucma_multicast *mc;
1048         int ret;
1049
1050         if (out_len < sizeof(resp))
1051                 return -ENOSPC;
1052
1053         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1054                 return -EFAULT;
1055
1056         ctx = ucma_get_ctx(file, cmd.id);
1057         if (IS_ERR(ctx))
1058                 return PTR_ERR(ctx);
1059
1060         mutex_lock(&file->mut);
1061         mc = ucma_alloc_multicast(ctx);
1062         if (!mc) {
1063                 ret = -ENOMEM;
1064                 goto err1;
1065         }
1066
1067         mc->uid = cmd.uid;
1068         memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
1069         ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
1070         if (ret)
1071                 goto err2;
1072
1073         resp.id = mc->id;
1074         if (copy_to_user((void __user *)(unsigned long)cmd.response,
1075                          &resp, sizeof(resp))) {
1076                 ret = -EFAULT;
1077                 goto err3;
1078         }
1079
1080         mutex_unlock(&file->mut);
1081         ucma_put_ctx(ctx);
1082         return 0;
1083
1084 err3:
1085         rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1086         ucma_cleanup_mc_events(mc);
1087 err2:
1088         mutex_lock(&mut);
1089         idr_remove(&multicast_idr, mc->id);
1090         mutex_unlock(&mut);
1091         list_del(&mc->list);
1092         kfree(mc);
1093 err1:
1094         mutex_unlock(&file->mut);
1095         ucma_put_ctx(ctx);
1096         return ret;
1097 }
1098
1099 static ssize_t ucma_leave_multicast(struct ucma_file *file,
1100                                     const char __user *inbuf,
1101                                     int in_len, int out_len)
1102 {
1103         struct rdma_ucm_destroy_id cmd;
1104         struct rdma_ucm_destroy_id_resp resp;
1105         struct ucma_multicast *mc;
1106         int ret = 0;
1107
1108         if (out_len < sizeof(resp))
1109                 return -ENOSPC;
1110
1111         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1112                 return -EFAULT;
1113
1114         mutex_lock(&mut);
1115         mc = idr_find(&multicast_idr, cmd.id);
1116         if (!mc)
1117                 mc = ERR_PTR(-ENOENT);
1118         else if (mc->ctx->file != file)
1119                 mc = ERR_PTR(-EINVAL);
1120         else {
1121                 idr_remove(&multicast_idr, mc->id);
1122                 atomic_inc(&mc->ctx->ref);
1123         }
1124         mutex_unlock(&mut);
1125
1126         if (IS_ERR(mc)) {
1127                 ret = PTR_ERR(mc);
1128                 goto out;
1129         }
1130
1131         rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1132         mutex_lock(&mc->ctx->file->mut);
1133         ucma_cleanup_mc_events(mc);
1134         list_del(&mc->list);
1135         mutex_unlock(&mc->ctx->file->mut);
1136
1137         ucma_put_ctx(mc->ctx);
1138         resp.events_reported = mc->events_reported;
1139         kfree(mc);
1140
1141         if (copy_to_user((void __user *)(unsigned long)cmd.response,
1142                          &resp, sizeof(resp)))
1143                 ret = -EFAULT;
1144 out:
1145         return ret;
1146 }
1147
1148 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1149 {
1150         /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1151         if (file1 < file2) {
1152                 mutex_lock(&file1->mut);
1153                 mutex_lock(&file2->mut);
1154         } else {
1155                 mutex_lock(&file2->mut);
1156                 mutex_lock(&file1->mut);
1157         }
1158 }
1159
1160 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1161 {
1162         if (file1 < file2) {
1163                 mutex_unlock(&file2->mut);
1164                 mutex_unlock(&file1->mut);
1165         } else {
1166                 mutex_unlock(&file1->mut);
1167                 mutex_unlock(&file2->mut);
1168         }
1169 }
1170
1171 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1172 {
1173         struct ucma_event *uevent, *tmp;
1174
1175         list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1176                 if (uevent->ctx == ctx)
1177                         list_move_tail(&uevent->list, &file->event_list);
1178 }
1179
1180 static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1181                                const char __user *inbuf,
1182                                int in_len, int out_len)
1183 {
1184         struct rdma_ucm_migrate_id cmd;
1185         struct rdma_ucm_migrate_resp resp;
1186         struct ucma_context *ctx;
1187         struct file *filp;
1188         struct ucma_file *cur_file;
1189         int ret = 0, fput_needed;
1190
1191         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1192                 return -EFAULT;
1193
1194         /* Get current fd to protect against it being closed */
1195         filp = fget_light(cmd.fd, &fput_needed);
1196         if (!filp)
1197                 return -ENOENT;
1198
1199         /* Validate current fd and prevent destruction of id. */
1200         ctx = ucma_get_ctx(filp->private_data, cmd.id);
1201         if (IS_ERR(ctx)) {
1202                 ret = PTR_ERR(ctx);
1203                 goto file_put;
1204         }
1205
1206         cur_file = ctx->file;
1207         if (cur_file == new_file) {
1208                 resp.events_reported = ctx->events_reported;
1209                 goto response;
1210         }
1211
1212         /*
1213          * Migrate events between fd's, maintaining order, and avoiding new
1214          * events being added before existing events.
1215          */
1216         ucma_lock_files(cur_file, new_file);
1217         mutex_lock(&mut);
1218
1219         list_move_tail(&ctx->list, &new_file->ctx_list);
1220         ucma_move_events(ctx, new_file);
1221         ctx->file = new_file;
1222         resp.events_reported = ctx->events_reported;
1223
1224         mutex_unlock(&mut);
1225         ucma_unlock_files(cur_file, new_file);
1226
1227 response:
1228         if (copy_to_user((void __user *)(unsigned long)cmd.response,
1229                          &resp, sizeof(resp)))
1230                 ret = -EFAULT;
1231
1232         ucma_put_ctx(ctx);
1233 file_put:
1234         fput_light(filp, fput_needed);
1235         return ret;
1236 }
1237
1238 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1239                                    const char __user *inbuf,
1240                                    int in_len, int out_len) = {
1241         [RDMA_USER_CM_CMD_CREATE_ID]    = ucma_create_id,
1242         [RDMA_USER_CM_CMD_DESTROY_ID]   = ucma_destroy_id,
1243         [RDMA_USER_CM_CMD_BIND_ADDR]    = ucma_bind_addr,
1244         [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1245         [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
1246         [RDMA_USER_CM_CMD_QUERY_ROUTE]  = ucma_query_route,
1247         [RDMA_USER_CM_CMD_CONNECT]      = ucma_connect,
1248         [RDMA_USER_CM_CMD_LISTEN]       = ucma_listen,
1249         [RDMA_USER_CM_CMD_ACCEPT]       = ucma_accept,
1250         [RDMA_USER_CM_CMD_REJECT]       = ucma_reject,
1251         [RDMA_USER_CM_CMD_DISCONNECT]   = ucma_disconnect,
1252         [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1253         [RDMA_USER_CM_CMD_GET_EVENT]    = ucma_get_event,
1254         [RDMA_USER_CM_CMD_GET_OPTION]   = NULL,
1255         [RDMA_USER_CM_CMD_SET_OPTION]   = ucma_set_option,
1256         [RDMA_USER_CM_CMD_NOTIFY]       = ucma_notify,
1257         [RDMA_USER_CM_CMD_JOIN_MCAST]   = ucma_join_multicast,
1258         [RDMA_USER_CM_CMD_LEAVE_MCAST]  = ucma_leave_multicast,
1259         [RDMA_USER_CM_CMD_MIGRATE_ID]   = ucma_migrate_id
1260 };
1261
1262 static ssize_t ucma_write(struct file *filp, const char __user *buf,
1263                           size_t len, loff_t *pos)
1264 {
1265         struct ucma_file *file = filp->private_data;
1266         struct rdma_ucm_cmd_hdr hdr;
1267         ssize_t ret;
1268
1269         if (len < sizeof(hdr))
1270                 return -EINVAL;
1271
1272         if (copy_from_user(&hdr, buf, sizeof(hdr)))
1273                 return -EFAULT;
1274
1275         if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1276                 return -EINVAL;
1277
1278         if (hdr.in + sizeof(hdr) > len)
1279                 return -EINVAL;
1280
1281         if (!ucma_cmd_table[hdr.cmd])
1282                 return -ENOSYS;
1283
1284         ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1285         if (!ret)
1286                 ret = len;
1287
1288         return ret;
1289 }
1290
1291 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1292 {
1293         struct ucma_file *file = filp->private_data;
1294         unsigned int mask = 0;
1295
1296         poll_wait(filp, &file->poll_wait, wait);
1297
1298         if (!list_empty(&file->event_list))
1299                 mask = POLLIN | POLLRDNORM;
1300
1301         return mask;
1302 }
1303
1304 /*
1305  * ucma_open() does not need the BKL:
1306  *
1307  *  - no global state is referred to;
1308  *  - there is no ioctl method to race against;
1309  *  - no further module initialization is required for open to work
1310  *    after the device is registered.
1311  */
1312 static int ucma_open(struct inode *inode, struct file *filp)
1313 {
1314         struct ucma_file *file;
1315
1316         file = kmalloc(sizeof *file, GFP_KERNEL);
1317         if (!file)
1318                 return -ENOMEM;
1319
1320         INIT_LIST_HEAD(&file->event_list);
1321         INIT_LIST_HEAD(&file->ctx_list);
1322         init_waitqueue_head(&file->poll_wait);
1323         mutex_init(&file->mut);
1324
1325         filp->private_data = file;
1326         file->filp = filp;
1327
1328         return nonseekable_open(inode, filp);
1329 }
1330
1331 static int ucma_close(struct inode *inode, struct file *filp)
1332 {
1333         struct ucma_file *file = filp->private_data;
1334         struct ucma_context *ctx, *tmp;
1335
1336         mutex_lock(&file->mut);
1337         list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1338                 mutex_unlock(&file->mut);
1339
1340                 mutex_lock(&mut);
1341                 idr_remove(&ctx_idr, ctx->id);
1342                 mutex_unlock(&mut);
1343
1344                 ucma_free_ctx(ctx);
1345                 mutex_lock(&file->mut);
1346         }
1347         mutex_unlock(&file->mut);
1348         kfree(file);
1349         return 0;
1350 }
1351
1352 static const struct file_operations ucma_fops = {
1353         .owner   = THIS_MODULE,
1354         .open    = ucma_open,
1355         .release = ucma_close,
1356         .write   = ucma_write,
1357         .poll    = ucma_poll,
1358         .llseek  = no_llseek,
1359 };
1360
1361 static struct miscdevice ucma_misc = {
1362         .minor          = MISC_DYNAMIC_MINOR,
1363         .name           = "rdma_cm",
1364         .nodename       = "infiniband/rdma_cm",
1365         .mode           = 0666,
1366         .fops           = &ucma_fops,
1367 };
1368
1369 static ssize_t show_abi_version(struct device *dev,
1370                                 struct device_attribute *attr,
1371                                 char *buf)
1372 {
1373         return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1374 }
1375 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1376
1377 static int __init ucma_init(void)
1378 {
1379         int ret;
1380
1381         ret = misc_register(&ucma_misc);
1382         if (ret)
1383                 return ret;
1384
1385         ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1386         if (ret) {
1387                 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1388                 goto err1;
1389         }
1390
1391         ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table);
1392         if (!ucma_ctl_table_hdr) {
1393                 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n");
1394                 ret = -ENOMEM;
1395                 goto err2;
1396         }
1397         return 0;
1398 err2:
1399         device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1400 err1:
1401         misc_deregister(&ucma_misc);
1402         return ret;
1403 }
1404
1405 static void __exit ucma_cleanup(void)
1406 {
1407         unregister_net_sysctl_table(ucma_ctl_table_hdr);
1408         device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1409         misc_deregister(&ucma_misc);
1410         idr_destroy(&ctx_idr);
1411 }
1412
1413 module_init(ucma_init);
1414 module_exit(ucma_cleanup);