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/mutex.h>
  35 #include <linux/poll.h>
  36 #include <linux/idr.h>
  37 #include <linux/in.h>
  38 #include <linux/in6.h>
  39 #include <linux/miscdevice.h>
  40
  41 #include <rdma/rdma_user_cm.h>
  42 #include <rdma/ib_marshall.h>
  43 #include <rdma/rdma_cm.h>
  44
  45 MODULE_AUTHOR("Sean Hefty");
  46 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
  47 MODULE_LICENSE("Dual BSD/GPL");
  48
  49 enum {
  50         UCMA_MAX_BACKLOG        = 128
  51 };
  52
  53 struct ucma_file {
  54         struct mutex            mut;
  55         struct file             *filp;
  56         struct list_head        ctx_list;
  57         struct list_head        event_list;
  58         wait_queue_head_t       poll_wait;
  59 };
  60
  61 struct ucma_context {
  62         int                     id;
  63         struct completion       comp;
  64         atomic_t                ref;
  65         int                     events_reported;
  66         int                     backlog;
  67
  68         struct ucma_file        *file;
  69         struct rdma_cm_id       *cm_id;
  70         u64                     uid;
  71
  72         struct list_head        list;
  73         struct list_head        mc_list;
  74 };
  75
  76 struct ucma_multicast {
  77         struct ucma_context     *ctx;
  78         int                     id;
  79         int                     events_reported;
  80
  81         u64                     uid;
  82         struct list_head        list;
  83         struct sockaddr         addr;
  84         u8                      pad[sizeof(struct sockaddr_in6) -
  85                                     sizeof(struct sockaddr)];
  86 };
  87
  88 struct ucma_event {
  89         struct ucma_context     *ctx;
  90         struct ucma_multicast   *mc;
  91         struct list_head        list;
  92         struct rdma_cm_id       *cm_id;
  93         struct rdma_ucm_event_resp resp;
  94 };
  95
  96 static DEFINE_MUTEX(mut);
  97 static DEFINE_IDR(ctx_idr);
  98 static DEFINE_IDR(multicast_idr);
  99
 100 static inline struct ucma_context *_ucma_find_context(int id,
 101                                                       struct ucma_file *file)
 102 {
 103         struct ucma_context *ctx;
 104
 105         ctx = idr_find(&ctx_idr, id);
 106         if (!ctx)
 107                 ctx = ERR_PTR(-ENOENT);
 108         else if (ctx->file != file)
 109                 ctx = ERR_PTR(-EINVAL);
 110         return ctx;
 111 }
 112
 113 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
 114 {
 115         struct ucma_context *ctx;
 116
 117         mutex_lock(&mut);
 118         ctx = _ucma_find_context(id, file);
 119         if (!IS_ERR(ctx))
 120                 atomic_inc(&ctx->ref);
 121         mutex_unlock(&mut);
 122         return ctx;
 123 }
 124
 125 static void ucma_put_ctx(struct ucma_context *ctx)
 126 {
 127         if (atomic_dec_and_test(&ctx->ref))
 128                 complete(&ctx->comp);
 129 }
 130
 131 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
 132 {
 133         struct ucma_context *ctx;
 134         int ret;
 135
 136         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 137         if (!ctx)
 138                 return NULL;
 139
 140         atomic_set(&ctx->ref, 1);
 141         init_completion(&ctx->comp);
 142         INIT_LIST_HEAD(&ctx->mc_list);
 143         ctx->file = file;
 144
 145         do {
 146                 ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
 147                 if (!ret)
 148                         goto error;
 149
 150                 mutex_lock(&mut);
 151                 ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
 152                 mutex_unlock(&mut);
 153         } while (ret == -EAGAIN);
 154
 155         if (ret)
 156                 goto error;
 157
 158         list_add_tail(&ctx->list, &file->ctx_list);
 159         return ctx;
 160
 161 error:
 162         kfree(ctx);
 163         return NULL;
 164 }
 165
 166 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
 167 {
 168         struct ucma_multicast *mc;
 169         int ret;
 170
 171         mc = kzalloc(sizeof(*mc), GFP_KERNEL);
 172         if (!mc)
 173                 return NULL;
 174
 175         do {
 176                 ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
 177                 if (!ret)
 178                         goto error;
 179
 180                 mutex_lock(&mut);
 181                 ret = idr_get_new(&multicast_idr, mc, &mc->id);
 182                 mutex_unlock(&mut);
 183         } while (ret == -EAGAIN);
 184
 185         if (ret)
 186                 goto error;
 187
 188         mc->ctx = ctx;
 189         list_add_tail(&mc->list, &ctx->mc_list);
 190         return mc;
 191
 192 error:
 193         kfree(mc);
 194         return NULL;
 195 }
 196
 197 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
 198                                  struct rdma_conn_param *src)
 199 {
 200         if (src->private_data_len)
 201                 memcpy(dst->private_data, src->private_data,
 202                        src->private_data_len);
 203         dst->private_data_len = src->private_data_len;
 204         dst->responder_resources =src->responder_resources;
 205         dst->initiator_depth = src->initiator_depth;
 206         dst->flow_control = src->flow_control;
 207         dst->retry_count = src->retry_count;
 208         dst->rnr_retry_count = src->rnr_retry_count;
 209         dst->srq = src->srq;
 210         dst->qp_num = src->qp_num;
 211 }
 212
 213 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
 214                                struct rdma_ud_param *src)
 215 {
 216         if (src->private_data_len)
 217                 memcpy(dst->private_data, src->private_data,
 218                        src->private_data_len);
 219         dst->private_data_len = src->private_data_len;
 220         ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
 221         dst->qp_num = src->qp_num;
 222         dst->qkey = src->qkey;
 223 }
 224
 225 static void ucma_set_event_context(struct ucma_context *ctx,
 226                                    struct rdma_cm_event *event,
 227                                    struct ucma_event *uevent)
 228 {
 229         uevent->ctx = ctx;
 230         switch (event->event) {
 231         case RDMA_CM_EVENT_MULTICAST_JOIN:
 232         case RDMA_CM_EVENT_MULTICAST_ERROR:
 233                 uevent->mc = (struct ucma_multicast *)
 234                              event->param.ud.private_data;
 235                 uevent->resp.uid = uevent->mc->uid;
 236                 uevent->resp.id = uevent->mc->id;
 237                 break;
 238         default:
 239                 uevent->resp.uid = ctx->uid;
 240                 uevent->resp.id = ctx->id;
 241                 break;
 242         }
 243 }
 244
 245 static int ucma_event_handler(struct rdma_cm_id *cm_id,
 246                               struct rdma_cm_event *event)
 247 {
 248         struct ucma_event *uevent;
 249         struct ucma_context *ctx = cm_id->context;
 250         int ret = 0;
 251
 252         uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
 253         if (!uevent)
 254                 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
 255
 256         uevent->cm_id = cm_id;
 257         ucma_set_event_context(ctx, event, uevent);
 258         uevent->resp.event = event->event;
 259         uevent->resp.status = event->status;
 260         if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB)
 261                 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
 262         else
 263                 ucma_copy_conn_event(&uevent->resp.param.conn,
 264                                      &event->param.conn);
 265
 266         mutex_lock(&ctx->file->mut);
 267         if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
 268                 if (!ctx->backlog) {
 269                         ret = -EDQUOT;
 270                         kfree(uevent);
 271                         goto out;
 272                 }
 273                 ctx->backlog--;
 274         } else if (!ctx->uid) {
 275                 /*
 276                  * We ignore events for new connections until userspace has set
 277                  * their context.  This can only happen if an error occurs on a
 278                  * new connection before the user accepts it.  This is okay,
 279                  * since the accept will just fail later.
 280                  */
 281                 kfree(uevent);
 282                 goto out;
 283         }
 284
 285         list_add_tail(&uevent->list, &ctx->file->event_list);
 286         wake_up_interruptible(&ctx->file->poll_wait);
 287 out:
 288         mutex_unlock(&ctx->file->mut);
 289         return ret;
 290 }
 291
 292 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
 293                               int in_len, int out_len)
 294 {
 295         struct ucma_context *ctx;
 296         struct rdma_ucm_get_event cmd;
 297         struct ucma_event *uevent;
 298         int ret = 0;
 299         DEFINE_WAIT(wait);
 300
 301         if (out_len < sizeof uevent->resp)
 302                 return -ENOSPC;
 303
 304         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 305                 return -EFAULT;
 306
 307         mutex_lock(&file->mut);
 308         while (list_empty(&file->event_list)) {
 309                 if (file->filp->f_flags & O_NONBLOCK) {
 310                         ret = -EAGAIN;
 311                         break;
 312                 }
 313
 314                 if (signal_pending(current)) {
 315                         ret = -ERESTARTSYS;
 316                         break;
 317                 }
 318
 319                 prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE);
 320                 mutex_unlock(&file->mut);
 321                 schedule();
 322                 mutex_lock(&file->mut);
 323                 finish_wait(&file->poll_wait, &wait);
 324         }
 325
 326         if (ret)
 327                 goto done;
 328
 329         uevent = list_entry(file->event_list.next, struct ucma_event, list);
 330
 331         if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
 332                 ctx = ucma_alloc_ctx(file);
 333                 if (!ctx) {
 334                         ret = -ENOMEM;
 335                         goto done;
 336                 }
 337                 uevent->ctx->backlog++;
 338                 ctx->cm_id = uevent->cm_id;
 339                 ctx->cm_id->context = ctx;
 340                 uevent->resp.id = ctx->id;
 341         }
 342
 343         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 344                          &uevent->resp, sizeof uevent->resp)) {
 345                 ret = -EFAULT;
 346                 goto done;
 347         }
 348
 349         list_del(&uevent->list);
 350         uevent->ctx->events_reported++;
 351         if (uevent->mc)
 352                 uevent->mc->events_reported++;
 353         kfree(uevent);
 354 done:
 355         mutex_unlock(&file->mut);
 356         return ret;
 357 }
 358
 359 static ssize_t ucma_create_id(struct ucma_file *file,
 360                                 const char __user *inbuf,
 361                                 int in_len, int out_len)
 362 {
 363         struct rdma_ucm_create_id cmd;
 364         struct rdma_ucm_create_id_resp resp;
 365         struct ucma_context *ctx;
 366         int ret;
 367
 368         if (out_len < sizeof(resp))
 369                 return -ENOSPC;
 370
 371         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 372                 return -EFAULT;
 373
 374         mutex_lock(&file->mut);
 375         ctx = ucma_alloc_ctx(file);
 376         mutex_unlock(&file->mut);
 377         if (!ctx)
 378                 return -ENOMEM;
 379
 380         ctx->uid = cmd.uid;
 381         ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps);
 382         if (IS_ERR(ctx->cm_id)) {
 383                 ret = PTR_ERR(ctx->cm_id);
 384                 goto err1;
 385         }
 386
 387         resp.id = ctx->id;
 388         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 389                          &resp, sizeof(resp))) {
 390                 ret = -EFAULT;
 391                 goto err2;
 392         }
 393         return 0;
 394
 395 err2:
 396         rdma_destroy_id(ctx->cm_id);
 397 err1:
 398         mutex_lock(&mut);
 399         idr_remove(&ctx_idr, ctx->id);
 400         mutex_unlock(&mut);
 401         kfree(ctx);
 402         return ret;
 403 }
 404
 405 static void ucma_cleanup_multicast(struct ucma_context *ctx)
 406 {
 407         struct ucma_multicast *mc, *tmp;
 408
 409         mutex_lock(&mut);
 410         list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
 411                 list_del(&mc->list);
 412                 idr_remove(&multicast_idr, mc->id);
 413                 kfree(mc);
 414         }
 415         mutex_unlock(&mut);
 416 }
 417
 418 static void ucma_cleanup_events(struct ucma_context *ctx)
 419 {
 420         struct ucma_event *uevent, *tmp;
 421
 422         list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
 423                 if (uevent->ctx != ctx)
 424                         continue;
 425
 426                 list_del(&uevent->list);
 427
 428                 /* clear incoming connections. */
 429                 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
 430                         rdma_destroy_id(uevent->cm_id);
 431
 432                 kfree(uevent);
 433         }
 434 }
 435
 436 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
 437 {
 438         struct ucma_event *uevent, *tmp;
 439
 440         list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
 441                 if (uevent->mc != mc)
 442                         continue;
 443
 444                 list_del(&uevent->list);
 445                 kfree(uevent);
 446         }
 447 }
 448
 449 static int ucma_free_ctx(struct ucma_context *ctx)
 450 {
 451         int events_reported;
 452
 453         /* No new events will be generated after destroying the id. */
 454         rdma_destroy_id(ctx->cm_id);
 455
 456         ucma_cleanup_multicast(ctx);
 457
 458         /* Cleanup events not yet reported to the user. */
 459         mutex_lock(&ctx->file->mut);
 460         ucma_cleanup_events(ctx);
 461         list_del(&ctx->list);
 462         mutex_unlock(&ctx->file->mut);
 463
 464         events_reported = ctx->events_reported;
 465         kfree(ctx);
 466         return events_reported;
 467 }
 468
 469 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
 470                                int in_len, int out_len)
 471 {
 472         struct rdma_ucm_destroy_id cmd;
 473         struct rdma_ucm_destroy_id_resp resp;
 474         struct ucma_context *ctx;
 475         int ret = 0;
 476
 477         if (out_len < sizeof(resp))
 478                 return -ENOSPC;
 479
 480         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 481                 return -EFAULT;
 482
 483         mutex_lock(&mut);
 484         ctx = _ucma_find_context(cmd.id, file);
 485         if (!IS_ERR(ctx))
 486                 idr_remove(&ctx_idr, ctx->id);
 487         mutex_unlock(&mut);
 488
 489         if (IS_ERR(ctx))
 490                 return PTR_ERR(ctx);
 491
 492         ucma_put_ctx(ctx);
 493         wait_for_completion(&ctx->comp);
 494         resp.events_reported = ucma_free_ctx(ctx);
 495
 496         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 497                          &resp, sizeof(resp)))
 498                 ret = -EFAULT;
 499
 500         return ret;
 501 }
 502
 503 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
 504                               int in_len, int out_len)
 505 {
 506         struct rdma_ucm_bind_addr cmd;
 507         struct ucma_context *ctx;
 508         int ret;
 509
 510         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 511                 return -EFAULT;
 512
 513         ctx = ucma_get_ctx(file, cmd.id);
 514         if (IS_ERR(ctx))
 515                 return PTR_ERR(ctx);
 516
 517         ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
 518         ucma_put_ctx(ctx);
 519         return ret;
 520 }
 521
 522 static ssize_t ucma_resolve_addr(struct ucma_file *file,
 523                                  const char __user *inbuf,
 524                                  int in_len, int out_len)
 525 {
 526         struct rdma_ucm_resolve_addr cmd;
 527         struct ucma_context *ctx;
 528         int ret;
 529
 530         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 531                 return -EFAULT;
 532
 533         ctx = ucma_get_ctx(file, cmd.id);
 534         if (IS_ERR(ctx))
 535                 return PTR_ERR(ctx);
 536
 537         ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
 538                                 (struct sockaddr *) &cmd.dst_addr,
 539                                 cmd.timeout_ms);
 540         ucma_put_ctx(ctx);
 541         return ret;
 542 }
 543
 544 static ssize_t ucma_resolve_route(struct ucma_file *file,
 545                                   const char __user *inbuf,
 546                                   int in_len, int out_len)
 547 {
 548         struct rdma_ucm_resolve_route cmd;
 549         struct ucma_context *ctx;
 550         int ret;
 551
 552         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 553                 return -EFAULT;
 554
 555         ctx = ucma_get_ctx(file, cmd.id);
 556         if (IS_ERR(ctx))
 557                 return PTR_ERR(ctx);
 558
 559         ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
 560         ucma_put_ctx(ctx);
 561         return ret;
 562 }
 563
 564 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
 565                                struct rdma_route *route)
 566 {
 567         struct rdma_dev_addr *dev_addr;
 568
 569         resp->num_paths = route->num_paths;
 570         switch (route->num_paths) {
 571         case 0:
 572                 dev_addr = &route->addr.dev_addr;
 573                 ib_addr_get_dgid(dev_addr,
 574                                  (union ib_gid *) &resp->ib_route[0].dgid);
 575                 ib_addr_get_sgid(dev_addr,
 576                                  (union ib_gid *) &resp->ib_route[0].sgid);
 577                 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
 578                 break;
 579         case 2:
 580                 ib_copy_path_rec_to_user(&resp->ib_route[1],
 581                                          &route->path_rec[1]);
 582                 /* fall through */
 583         case 1:
 584                 ib_copy_path_rec_to_user(&resp->ib_route[0],
 585                                          &route->path_rec[0]);
 586                 break;
 587         default:
 588                 break;
 589         }
 590 }
 591
 592 static ssize_t ucma_query_route(struct ucma_file *file,
 593                                 const char __user *inbuf,
 594                                 int in_len, int out_len)
 595 {
 596         struct rdma_ucm_query_route cmd;
 597         struct rdma_ucm_query_route_resp resp;
 598         struct ucma_context *ctx;
 599         struct sockaddr *addr;
 600         int ret = 0;
 601
 602         if (out_len < sizeof(resp))
 603                 return -ENOSPC;
 604
 605         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 606                 return -EFAULT;
 607
 608         ctx = ucma_get_ctx(file, cmd.id);
 609         if (IS_ERR(ctx))
 610                 return PTR_ERR(ctx);
 611
 612         memset(&resp, 0, sizeof resp);
 613         addr = &ctx->cm_id->route.addr.src_addr;
 614         memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
 615                                      sizeof(struct sockaddr_in) :
 616                                      sizeof(struct sockaddr_in6));
 617         addr = &ctx->cm_id->route.addr.dst_addr;
 618         memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
 619                                      sizeof(struct sockaddr_in) :
 620                                      sizeof(struct sockaddr_in6));
 621         if (!ctx->cm_id->device)
 622                 goto out;
 623
 624         resp.node_guid = ctx->cm_id->device->node_guid;
 625         resp.port_num = ctx->cm_id->port_num;
 626         switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
 627         case RDMA_TRANSPORT_IB:
 628                 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
 629                 break;
 630         default:
 631                 break;
 632         }
 633
 634 out:
 635         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 636                          &resp, sizeof(resp)))
 637                 ret = -EFAULT;
 638
 639         ucma_put_ctx(ctx);
 640         return ret;
 641 }
 642
 643 static void ucma_copy_conn_param(struct rdma_conn_param *dst,
 644                                  struct rdma_ucm_conn_param *src)
 645 {
 646         dst->private_data = src->private_data;
 647         dst->private_data_len = src->private_data_len;
 648         dst->responder_resources =src->responder_resources;
 649         dst->initiator_depth = src->initiator_depth;
 650         dst->flow_control = src->flow_control;
 651         dst->retry_count = src->retry_count;
 652         dst->rnr_retry_count = src->rnr_retry_count;
 653         dst->srq = src->srq;
 654         dst->qp_num = src->qp_num;
 655 }
 656
 657 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
 658                             int in_len, int out_len)
 659 {
 660         struct rdma_ucm_connect cmd;
 661         struct rdma_conn_param conn_param;
 662         struct ucma_context *ctx;
 663         int ret;
 664
 665         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 666                 return -EFAULT;
 667
 668         if (!cmd.conn_param.valid)
 669                 return -EINVAL;
 670
 671         ctx = ucma_get_ctx(file, cmd.id);
 672         if (IS_ERR(ctx))
 673                 return PTR_ERR(ctx);
 674
 675         ucma_copy_conn_param(&conn_param, &cmd.conn_param);
 676         ret = rdma_connect(ctx->cm_id, &conn_param);
 677         ucma_put_ctx(ctx);
 678         return ret;
 679 }
 680
 681 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
 682                            int in_len, int out_len)
 683 {
 684         struct rdma_ucm_listen cmd;
 685         struct ucma_context *ctx;
 686         int ret;
 687
 688         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 689                 return -EFAULT;
 690
 691         ctx = ucma_get_ctx(file, cmd.id);
 692         if (IS_ERR(ctx))
 693                 return PTR_ERR(ctx);
 694
 695         ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ?
 696                        cmd.backlog : UCMA_MAX_BACKLOG;
 697         ret = rdma_listen(ctx->cm_id, ctx->backlog);
 698         ucma_put_ctx(ctx);
 699         return ret;
 700 }
 701
 702 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
 703                            int in_len, int out_len)
 704 {
 705         struct rdma_ucm_accept cmd;
 706         struct rdma_conn_param conn_param;
 707         struct ucma_context *ctx;
 708         int ret;
 709
 710         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 711                 return -EFAULT;
 712
 713         ctx = ucma_get_ctx(file, cmd.id);
 714         if (IS_ERR(ctx))
 715                 return PTR_ERR(ctx);
 716
 717         if (cmd.conn_param.valid) {
 718                 ctx->uid = cmd.uid;
 719                 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
 720                 ret = rdma_accept(ctx->cm_id, &conn_param);
 721         } else
 722                 ret = rdma_accept(ctx->cm_id, NULL);
 723
 724         ucma_put_ctx(ctx);
 725         return ret;
 726 }
 727
 728 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
 729                            int in_len, int out_len)
 730 {
 731         struct rdma_ucm_reject cmd;
 732         struct ucma_context *ctx;
 733         int ret;
 734
 735         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 736                 return -EFAULT;
 737
 738         ctx = ucma_get_ctx(file, cmd.id);
 739         if (IS_ERR(ctx))
 740                 return PTR_ERR(ctx);
 741
 742         ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
 743         ucma_put_ctx(ctx);
 744         return ret;
 745 }
 746
 747 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
 748                                int in_len, int out_len)
 749 {
 750         struct rdma_ucm_disconnect cmd;
 751         struct ucma_context *ctx;
 752         int ret;
 753
 754         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 755                 return -EFAULT;
 756
 757         ctx = ucma_get_ctx(file, cmd.id);
 758         if (IS_ERR(ctx))
 759                 return PTR_ERR(ctx);
 760
 761         ret = rdma_disconnect(ctx->cm_id);
 762         ucma_put_ctx(ctx);
 763         return ret;
 764 }
 765
 766 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
 767                                  const char __user *inbuf,
 768                                  int in_len, int out_len)
 769 {
 770         struct rdma_ucm_init_qp_attr cmd;
 771         struct ib_uverbs_qp_attr resp;
 772         struct ucma_context *ctx;
 773         struct ib_qp_attr qp_attr;
 774         int ret;
 775
 776         if (out_len < sizeof(resp))
 777                 return -ENOSPC;
 778
 779         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 780                 return -EFAULT;
 781
 782         ctx = ucma_get_ctx(file, cmd.id);
 783         if (IS_ERR(ctx))
 784                 return PTR_ERR(ctx);
 785
 786         resp.qp_attr_mask = 0;
 787         memset(&qp_attr, 0, sizeof qp_attr);
 788         qp_attr.qp_state = cmd.qp_state;
 789         ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
 790         if (ret)
 791                 goto out;
 792
 793         ib_copy_qp_attr_to_user(&resp, &qp_attr);
 794         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 795                          &resp, sizeof(resp)))
 796                 ret = -EFAULT;
 797
 798 out:
 799         ucma_put_ctx(ctx);
 800         return ret;
 801 }
 802
 803 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
 804                            int in_len, int out_len)
 805 {
 806         struct rdma_ucm_notify cmd;
 807         struct ucma_context *ctx;
 808         int ret;
 809
 810         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 811                 return -EFAULT;
 812
 813         ctx = ucma_get_ctx(file, cmd.id);
 814         if (IS_ERR(ctx))
 815                 return PTR_ERR(ctx);
 816
 817         ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
 818         ucma_put_ctx(ctx);
 819         return ret;
 820 }
 821
 822 static ssize_t ucma_join_multicast(struct ucma_file *file,
 823                                    const char __user *inbuf,
 824                                    int in_len, int out_len)
 825 {
 826         struct rdma_ucm_join_mcast cmd;
 827         struct rdma_ucm_create_id_resp resp;
 828         struct ucma_context *ctx;
 829         struct ucma_multicast *mc;
 830         int ret;
 831
 832         if (out_len < sizeof(resp))
 833                 return -ENOSPC;
 834
 835         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 836                 return -EFAULT;
 837
 838         ctx = ucma_get_ctx(file, cmd.id);
 839         if (IS_ERR(ctx))
 840                 return PTR_ERR(ctx);
 841
 842         mutex_lock(&file->mut);
 843         mc = ucma_alloc_multicast(ctx);
 844         if (IS_ERR(mc)) {
 845                 ret = PTR_ERR(mc);
 846                 goto err1;
 847         }
 848
 849         mc->uid = cmd.uid;
 850         memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
 851         ret = rdma_join_multicast(ctx->cm_id, &mc->addr, mc);
 852         if (ret)
 853                 goto err2;
 854
 855         resp.id = mc->id;
 856         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 857                          &resp, sizeof(resp))) {
 858                 ret = -EFAULT;
 859                 goto err3;
 860         }
 861
 862         mutex_unlock(&file->mut);
 863         ucma_put_ctx(ctx);
 864         return 0;
 865
 866 err3:
 867         rdma_leave_multicast(ctx->cm_id, &mc->addr);
 868         ucma_cleanup_mc_events(mc);
 869 err2:
 870         mutex_lock(&mut);
 871         idr_remove(&multicast_idr, mc->id);
 872         mutex_unlock(&mut);
 873         list_del(&mc->list);
 874         kfree(mc);
 875 err1:
 876         mutex_unlock(&file->mut);
 877         ucma_put_ctx(ctx);
 878         return ret;
 879 }
 880
 881 static ssize_t ucma_leave_multicast(struct ucma_file *file,
 882                                     const char __user *inbuf,
 883                                     int in_len, int out_len)
 884 {
 885         struct rdma_ucm_destroy_id cmd;
 886         struct rdma_ucm_destroy_id_resp resp;
 887         struct ucma_multicast *mc;
 888         int ret = 0;
 889
 890         if (out_len < sizeof(resp))
 891                 return -ENOSPC;
 892
 893         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 894                 return -EFAULT;
 895
 896         mutex_lock(&mut);
 897         mc = idr_find(&multicast_idr, cmd.id);
 898         if (!mc)
 899                 mc = ERR_PTR(-ENOENT);
 900         else if (mc->ctx->file != file)
 901                 mc = ERR_PTR(-EINVAL);
 902         else {
 903                 idr_remove(&multicast_idr, mc->id);
 904                 atomic_inc(&mc->ctx->ref);
 905         }
 906         mutex_unlock(&mut);
 907
 908         if (IS_ERR(mc)) {
 909                 ret = PTR_ERR(mc);
 910                 goto out;
 911         }
 912
 913         rdma_leave_multicast(mc->ctx->cm_id, &mc->addr);
 914         mutex_lock(&mc->ctx->file->mut);
 915         ucma_cleanup_mc_events(mc);
 916         list_del(&mc->list);
 917         mutex_unlock(&mc->ctx->file->mut);
 918
 919         ucma_put_ctx(mc->ctx);
 920         resp.events_reported = mc->events_reported;
 921         kfree(mc);
 922
 923         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 924                          &resp, sizeof(resp)))
 925                 ret = -EFAULT;
 926 out:
 927         return ret;
 928 }
 929
 930 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
 931                                    const char __user *inbuf,
 932                                    int in_len, int out_len) = {
 933         [RDMA_USER_CM_CMD_CREATE_ID]    = ucma_create_id,
 934         [RDMA_USER_CM_CMD_DESTROY_ID]   = ucma_destroy_id,
 935         [RDMA_USER_CM_CMD_BIND_ADDR]    = ucma_bind_addr,
 936         [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
 937         [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
 938         [RDMA_USER_CM_CMD_QUERY_ROUTE]  = ucma_query_route,
 939         [RDMA_USER_CM_CMD_CONNECT]      = ucma_connect,
 940         [RDMA_USER_CM_CMD_LISTEN]       = ucma_listen,
 941         [RDMA_USER_CM_CMD_ACCEPT]       = ucma_accept,
 942         [RDMA_USER_CM_CMD_REJECT]       = ucma_reject,
 943         [RDMA_USER_CM_CMD_DISCONNECT]   = ucma_disconnect,
 944         [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
 945         [RDMA_USER_CM_CMD_GET_EVENT]    = ucma_get_event,
 946         [RDMA_USER_CM_CMD_GET_OPTION]   = NULL,
 947         [RDMA_USER_CM_CMD_SET_OPTION]   = NULL,
 948         [RDMA_USER_CM_CMD_NOTIFY]       = ucma_notify,
 949         [RDMA_USER_CM_CMD_JOIN_MCAST]   = ucma_join_multicast,
 950         [RDMA_USER_CM_CMD_LEAVE_MCAST]  = ucma_leave_multicast,
 951 };
 952
 953 static ssize_t ucma_write(struct file *filp, const char __user *buf,
 954                           size_t len, loff_t *pos)
 955 {
 956         struct ucma_file *file = filp->private_data;
 957         struct rdma_ucm_cmd_hdr hdr;
 958         ssize_t ret;
 959
 960         if (len < sizeof(hdr))
 961                 return -EINVAL;
 962
 963         if (copy_from_user(&hdr, buf, sizeof(hdr)))
 964                 return -EFAULT;
 965
 966         if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
 967                 return -EINVAL;
 968
 969         if (hdr.in + sizeof(hdr) > len)
 970                 return -EINVAL;
 971
 972         if (!ucma_cmd_table[hdr.cmd])
 973                 return -ENOSYS;
 974
 975         ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
 976         if (!ret)
 977                 ret = len;
 978
 979         return ret;
 980 }
 981
 982 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
 983 {
 984         struct ucma_file *file = filp->private_data;
 985         unsigned int mask = 0;
 986
 987         poll_wait(filp, &file->poll_wait, wait);
 988
 989         if (!list_empty(&file->event_list))
 990                 mask = POLLIN | POLLRDNORM;
 991
 992         return mask;
 993 }
 994
 995 static int ucma_open(struct inode *inode, struct file *filp)
 996 {
 997         struct ucma_file *file;
 998
 999         file = kmalloc(sizeof *file, GFP_KERNEL);
1000         if (!file)
1001                 return -ENOMEM;
1002
1003         INIT_LIST_HEAD(&file->event_list);
1004         INIT_LIST_HEAD(&file->ctx_list);
1005         init_waitqueue_head(&file->poll_wait);
1006         mutex_init(&file->mut);
1007
1008         filp->private_data = file;
1009         file->filp = filp;
1010         return 0;
1011 }
1012
1013 static int ucma_close(struct inode *inode, struct file *filp)
1014 {
1015         struct ucma_file *file = filp->private_data;
1016         struct ucma_context *ctx, *tmp;
1017
1018         mutex_lock(&file->mut);
1019         list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1020                 mutex_unlock(&file->mut);
1021
1022                 mutex_lock(&mut);
1023                 idr_remove(&ctx_idr, ctx->id);
1024                 mutex_unlock(&mut);
1025
1026                 ucma_free_ctx(ctx);
1027                 mutex_lock(&file->mut);
1028         }
1029         mutex_unlock(&file->mut);
1030         kfree(file);
1031         return 0;
1032 }
1033
1034 static const struct file_operations ucma_fops = {
1035         .owner   = THIS_MODULE,
1036         .open    = ucma_open,
1037         .release = ucma_close,
1038         .write   = ucma_write,
1039         .poll    = ucma_poll,
1040 };
1041
1042 static struct miscdevice ucma_misc = {
1043         .minor  = MISC_DYNAMIC_MINOR,
1044         .name   = "rdma_cm",
1045         .fops   = &ucma_fops,
1046 };
1047
1048 static ssize_t show_abi_version(struct device *dev,
1049                                 struct device_attribute *attr,
1050                                 char *buf)
1051 {
1052         return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1053 }
1054 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1055
1056 static int __init ucma_init(void)
1057 {
1058         int ret;
1059
1060         ret = misc_register(&ucma_misc);
1061         if (ret)
1062                 return ret;
1063
1064         ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1065         if (ret) {
1066                 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1067                 goto err;
1068         }
1069         return 0;
1070 err:
1071         misc_deregister(&ucma_misc);
1072         return ret;
1073 }
1074
1075 static void __exit ucma_cleanup(void)
1076 {
1077         device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1078         misc_deregister(&ucma_misc);
1079         idr_destroy(&ctx_idr);
1080 }
1081
1082 module_init(ucma_init);
1083 module_exit(ucma_cleanup);