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 = -ENOMEM;
 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                 mutex_unlock(&file->mut);
 310
 311                 if (file->filp->f_flags & O_NONBLOCK)
 312                         return -EAGAIN;
 313
 314                 if (wait_event_interruptible(file->poll_wait,
 315                                              !list_empty(&file->event_list)))
 316                         return -ERESTARTSYS;
 317
 318                 mutex_lock(&file->mut);
 319         }
 320
 321         uevent = list_entry(file->event_list.next, struct ucma_event, list);
 322
 323         if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
 324                 ctx = ucma_alloc_ctx(file);
 325                 if (!ctx) {
 326                         ret = -ENOMEM;
 327                         goto done;
 328                 }
 329                 uevent->ctx->backlog++;
 330                 ctx->cm_id = uevent->cm_id;
 331                 ctx->cm_id->context = ctx;
 332                 uevent->resp.id = ctx->id;
 333         }
 334
 335         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 336                          &uevent->resp, sizeof uevent->resp)) {
 337                 ret = -EFAULT;
 338                 goto done;
 339         }
 340
 341         list_del(&uevent->list);
 342         uevent->ctx->events_reported++;
 343         if (uevent->mc)
 344                 uevent->mc->events_reported++;
 345         kfree(uevent);
 346 done:
 347         mutex_unlock(&file->mut);
 348         return ret;
 349 }
 350
 351 static ssize_t ucma_create_id(struct ucma_file *file,
 352                                 const char __user *inbuf,
 353                                 int in_len, int out_len)
 354 {
 355         struct rdma_ucm_create_id cmd;
 356         struct rdma_ucm_create_id_resp resp;
 357         struct ucma_context *ctx;
 358         int ret;
 359
 360         if (out_len < sizeof(resp))
 361                 return -ENOSPC;
 362
 363         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 364                 return -EFAULT;
 365
 366         mutex_lock(&file->mut);
 367         ctx = ucma_alloc_ctx(file);
 368         mutex_unlock(&file->mut);
 369         if (!ctx)
 370                 return -ENOMEM;
 371
 372         ctx->uid = cmd.uid;
 373         ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps);
 374         if (IS_ERR(ctx->cm_id)) {
 375                 ret = PTR_ERR(ctx->cm_id);
 376                 goto err1;
 377         }
 378
 379         resp.id = ctx->id;
 380         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 381                          &resp, sizeof(resp))) {
 382                 ret = -EFAULT;
 383                 goto err2;
 384         }
 385         return 0;
 386
 387 err2:
 388         rdma_destroy_id(ctx->cm_id);
 389 err1:
 390         mutex_lock(&mut);
 391         idr_remove(&ctx_idr, ctx->id);
 392         mutex_unlock(&mut);
 393         kfree(ctx);
 394         return ret;
 395 }
 396
 397 static void ucma_cleanup_multicast(struct ucma_context *ctx)
 398 {
 399         struct ucma_multicast *mc, *tmp;
 400
 401         mutex_lock(&mut);
 402         list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
 403                 list_del(&mc->list);
 404                 idr_remove(&multicast_idr, mc->id);
 405                 kfree(mc);
 406         }
 407         mutex_unlock(&mut);
 408 }
 409
 410 static void ucma_cleanup_events(struct ucma_context *ctx)
 411 {
 412         struct ucma_event *uevent, *tmp;
 413
 414         list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
 415                 if (uevent->ctx != ctx)
 416                         continue;
 417
 418                 list_del(&uevent->list);
 419
 420                 /* clear incoming connections. */
 421                 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
 422                         rdma_destroy_id(uevent->cm_id);
 423
 424                 kfree(uevent);
 425         }
 426 }
 427
 428 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
 429 {
 430         struct ucma_event *uevent, *tmp;
 431
 432         list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
 433                 if (uevent->mc != mc)
 434                         continue;
 435
 436                 list_del(&uevent->list);
 437                 kfree(uevent);
 438         }
 439 }
 440
 441 static int ucma_free_ctx(struct ucma_context *ctx)
 442 {
 443         int events_reported;
 444
 445         /* No new events will be generated after destroying the id. */
 446         rdma_destroy_id(ctx->cm_id);
 447
 448         ucma_cleanup_multicast(ctx);
 449
 450         /* Cleanup events not yet reported to the user. */
 451         mutex_lock(&ctx->file->mut);
 452         ucma_cleanup_events(ctx);
 453         list_del(&ctx->list);
 454         mutex_unlock(&ctx->file->mut);
 455
 456         events_reported = ctx->events_reported;
 457         kfree(ctx);
 458         return events_reported;
 459 }
 460
 461 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
 462                                int in_len, int out_len)
 463 {
 464         struct rdma_ucm_destroy_id cmd;
 465         struct rdma_ucm_destroy_id_resp resp;
 466         struct ucma_context *ctx;
 467         int ret = 0;
 468
 469         if (out_len < sizeof(resp))
 470                 return -ENOSPC;
 471
 472         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 473                 return -EFAULT;
 474
 475         mutex_lock(&mut);
 476         ctx = _ucma_find_context(cmd.id, file);
 477         if (!IS_ERR(ctx))
 478                 idr_remove(&ctx_idr, ctx->id);
 479         mutex_unlock(&mut);
 480
 481         if (IS_ERR(ctx))
 482                 return PTR_ERR(ctx);
 483
 484         ucma_put_ctx(ctx);
 485         wait_for_completion(&ctx->comp);
 486         resp.events_reported = ucma_free_ctx(ctx);
 487
 488         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 489                          &resp, sizeof(resp)))
 490                 ret = -EFAULT;
 491
 492         return ret;
 493 }
 494
 495 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
 496                               int in_len, int out_len)
 497 {
 498         struct rdma_ucm_bind_addr cmd;
 499         struct ucma_context *ctx;
 500         int ret;
 501
 502         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 503                 return -EFAULT;
 504
 505         ctx = ucma_get_ctx(file, cmd.id);
 506         if (IS_ERR(ctx))
 507                 return PTR_ERR(ctx);
 508
 509         ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
 510         ucma_put_ctx(ctx);
 511         return ret;
 512 }
 513
 514 static ssize_t ucma_resolve_addr(struct ucma_file *file,
 515                                  const char __user *inbuf,
 516                                  int in_len, int out_len)
 517 {
 518         struct rdma_ucm_resolve_addr cmd;
 519         struct ucma_context *ctx;
 520         int ret;
 521
 522         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 523                 return -EFAULT;
 524
 525         ctx = ucma_get_ctx(file, cmd.id);
 526         if (IS_ERR(ctx))
 527                 return PTR_ERR(ctx);
 528
 529         ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
 530                                 (struct sockaddr *) &cmd.dst_addr,
 531                                 cmd.timeout_ms);
 532         ucma_put_ctx(ctx);
 533         return ret;
 534 }
 535
 536 static ssize_t ucma_resolve_route(struct ucma_file *file,
 537                                   const char __user *inbuf,
 538                                   int in_len, int out_len)
 539 {
 540         struct rdma_ucm_resolve_route 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_resolve_route(ctx->cm_id, cmd.timeout_ms);
 552         ucma_put_ctx(ctx);
 553         return ret;
 554 }
 555
 556 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
 557                                struct rdma_route *route)
 558 {
 559         struct rdma_dev_addr *dev_addr;
 560
 561         resp->num_paths = route->num_paths;
 562         switch (route->num_paths) {
 563         case 0:
 564                 dev_addr = &route->addr.dev_addr;
 565                 ib_addr_get_dgid(dev_addr,
 566                                  (union ib_gid *) &resp->ib_route[0].dgid);
 567                 ib_addr_get_sgid(dev_addr,
 568                                  (union ib_gid *) &resp->ib_route[0].sgid);
 569                 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
 570                 break;
 571         case 2:
 572                 ib_copy_path_rec_to_user(&resp->ib_route[1],
 573                                          &route->path_rec[1]);
 574                 /* fall through */
 575         case 1:
 576                 ib_copy_path_rec_to_user(&resp->ib_route[0],
 577                                          &route->path_rec[0]);
 578                 break;
 579         default:
 580                 break;
 581         }
 582 }
 583
 584 static ssize_t ucma_query_route(struct ucma_file *file,
 585                                 const char __user *inbuf,
 586                                 int in_len, int out_len)
 587 {
 588         struct rdma_ucm_query_route cmd;
 589         struct rdma_ucm_query_route_resp resp;
 590         struct ucma_context *ctx;
 591         struct sockaddr *addr;
 592         int ret = 0;
 593
 594         if (out_len < sizeof(resp))
 595                 return -ENOSPC;
 596
 597         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 598                 return -EFAULT;
 599
 600         ctx = ucma_get_ctx(file, cmd.id);
 601         if (IS_ERR(ctx))
 602                 return PTR_ERR(ctx);
 603
 604         memset(&resp, 0, sizeof resp);
 605         addr = &ctx->cm_id->route.addr.src_addr;
 606         memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
 607                                      sizeof(struct sockaddr_in) :
 608                                      sizeof(struct sockaddr_in6));
 609         addr = &ctx->cm_id->route.addr.dst_addr;
 610         memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
 611                                      sizeof(struct sockaddr_in) :
 612                                      sizeof(struct sockaddr_in6));
 613         if (!ctx->cm_id->device)
 614                 goto out;
 615
 616         resp.node_guid = ctx->cm_id->device->node_guid;
 617         resp.port_num = ctx->cm_id->port_num;
 618         switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
 619         case RDMA_TRANSPORT_IB:
 620                 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
 621                 break;
 622         default:
 623                 break;
 624         }
 625
 626 out:
 627         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 628                          &resp, sizeof(resp)))
 629                 ret = -EFAULT;
 630
 631         ucma_put_ctx(ctx);
 632         return ret;
 633 }
 634
 635 static void ucma_copy_conn_param(struct rdma_conn_param *dst,
 636                                  struct rdma_ucm_conn_param *src)
 637 {
 638         dst->private_data = src->private_data;
 639         dst->private_data_len = src->private_data_len;
 640         dst->responder_resources =src->responder_resources;
 641         dst->initiator_depth = src->initiator_depth;
 642         dst->flow_control = src->flow_control;
 643         dst->retry_count = src->retry_count;
 644         dst->rnr_retry_count = src->rnr_retry_count;
 645         dst->srq = src->srq;
 646         dst->qp_num = src->qp_num;
 647 }
 648
 649 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
 650                             int in_len, int out_len)
 651 {
 652         struct rdma_ucm_connect cmd;
 653         struct rdma_conn_param conn_param;
 654         struct ucma_context *ctx;
 655         int ret;
 656
 657         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 658                 return -EFAULT;
 659
 660         if (!cmd.conn_param.valid)
 661                 return -EINVAL;
 662
 663         ctx = ucma_get_ctx(file, cmd.id);
 664         if (IS_ERR(ctx))
 665                 return PTR_ERR(ctx);
 666
 667         ucma_copy_conn_param(&conn_param, &cmd.conn_param);
 668         ret = rdma_connect(ctx->cm_id, &conn_param);
 669         ucma_put_ctx(ctx);
 670         return ret;
 671 }
 672
 673 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
 674                            int in_len, int out_len)
 675 {
 676         struct rdma_ucm_listen cmd;
 677         struct ucma_context *ctx;
 678         int ret;
 679
 680         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 681                 return -EFAULT;
 682
 683         ctx = ucma_get_ctx(file, cmd.id);
 684         if (IS_ERR(ctx))
 685                 return PTR_ERR(ctx);
 686
 687         ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ?
 688                        cmd.backlog : UCMA_MAX_BACKLOG;
 689         ret = rdma_listen(ctx->cm_id, ctx->backlog);
 690         ucma_put_ctx(ctx);
 691         return ret;
 692 }
 693
 694 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
 695                            int in_len, int out_len)
 696 {
 697         struct rdma_ucm_accept cmd;
 698         struct rdma_conn_param conn_param;
 699         struct ucma_context *ctx;
 700         int ret;
 701
 702         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 703                 return -EFAULT;
 704
 705         ctx = ucma_get_ctx(file, cmd.id);
 706         if (IS_ERR(ctx))
 707                 return PTR_ERR(ctx);
 708
 709         if (cmd.conn_param.valid) {
 710                 ctx->uid = cmd.uid;
 711                 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
 712                 ret = rdma_accept(ctx->cm_id, &conn_param);
 713         } else
 714                 ret = rdma_accept(ctx->cm_id, NULL);
 715
 716         ucma_put_ctx(ctx);
 717         return ret;
 718 }
 719
 720 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
 721                            int in_len, int out_len)
 722 {
 723         struct rdma_ucm_reject cmd;
 724         struct ucma_context *ctx;
 725         int ret;
 726
 727         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 728                 return -EFAULT;
 729
 730         ctx = ucma_get_ctx(file, cmd.id);
 731         if (IS_ERR(ctx))
 732                 return PTR_ERR(ctx);
 733
 734         ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
 735         ucma_put_ctx(ctx);
 736         return ret;
 737 }
 738
 739 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
 740                                int in_len, int out_len)
 741 {
 742         struct rdma_ucm_disconnect cmd;
 743         struct ucma_context *ctx;
 744         int ret;
 745
 746         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 747                 return -EFAULT;
 748
 749         ctx = ucma_get_ctx(file, cmd.id);
 750         if (IS_ERR(ctx))
 751                 return PTR_ERR(ctx);
 752
 753         ret = rdma_disconnect(ctx->cm_id);
 754         ucma_put_ctx(ctx);
 755         return ret;
 756 }
 757
 758 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
 759                                  const char __user *inbuf,
 760                                  int in_len, int out_len)
 761 {
 762         struct rdma_ucm_init_qp_attr cmd;
 763         struct ib_uverbs_qp_attr resp;
 764         struct ucma_context *ctx;
 765         struct ib_qp_attr qp_attr;
 766         int ret;
 767
 768         if (out_len < sizeof(resp))
 769                 return -ENOSPC;
 770
 771         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 772                 return -EFAULT;
 773
 774         ctx = ucma_get_ctx(file, cmd.id);
 775         if (IS_ERR(ctx))
 776                 return PTR_ERR(ctx);
 777
 778         resp.qp_attr_mask = 0;
 779         memset(&qp_attr, 0, sizeof qp_attr);
 780         qp_attr.qp_state = cmd.qp_state;
 781         ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
 782         if (ret)
 783                 goto out;
 784
 785         ib_copy_qp_attr_to_user(&resp, &qp_attr);
 786         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 787                          &resp, sizeof(resp)))
 788                 ret = -EFAULT;
 789
 790 out:
 791         ucma_put_ctx(ctx);
 792         return ret;
 793 }
 794
 795 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
 796                            int in_len, int out_len)
 797 {
 798         struct rdma_ucm_notify cmd;
 799         struct ucma_context *ctx;
 800         int ret;
 801
 802         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 803                 return -EFAULT;
 804
 805         ctx = ucma_get_ctx(file, cmd.id);
 806         if (IS_ERR(ctx))
 807                 return PTR_ERR(ctx);
 808
 809         ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
 810         ucma_put_ctx(ctx);
 811         return ret;
 812 }
 813
 814 static ssize_t ucma_join_multicast(struct ucma_file *file,
 815                                    const char __user *inbuf,
 816                                    int in_len, int out_len)
 817 {
 818         struct rdma_ucm_join_mcast cmd;
 819         struct rdma_ucm_create_id_resp resp;
 820         struct ucma_context *ctx;
 821         struct ucma_multicast *mc;
 822         int ret;
 823
 824         if (out_len < sizeof(resp))
 825                 return -ENOSPC;
 826
 827         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 828                 return -EFAULT;
 829
 830         ctx = ucma_get_ctx(file, cmd.id);
 831         if (IS_ERR(ctx))
 832                 return PTR_ERR(ctx);
 833
 834         mutex_lock(&file->mut);
 835         mc = ucma_alloc_multicast(ctx);
 836         if (IS_ERR(mc)) {
 837                 ret = PTR_ERR(mc);
 838                 goto err1;
 839         }
 840
 841         mc->uid = cmd.uid;
 842         memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
 843         ret = rdma_join_multicast(ctx->cm_id, &mc->addr, mc);
 844         if (ret)
 845                 goto err2;
 846
 847         resp.id = mc->id;
 848         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 849                          &resp, sizeof(resp))) {
 850                 ret = -EFAULT;
 851                 goto err3;
 852         }
 853
 854         mutex_unlock(&file->mut);
 855         ucma_put_ctx(ctx);
 856         return 0;
 857
 858 err3:
 859         rdma_leave_multicast(ctx->cm_id, &mc->addr);
 860         ucma_cleanup_mc_events(mc);
 861 err2:
 862         mutex_lock(&mut);
 863         idr_remove(&multicast_idr, mc->id);
 864         mutex_unlock(&mut);
 865         list_del(&mc->list);
 866         kfree(mc);
 867 err1:
 868         mutex_unlock(&file->mut);
 869         ucma_put_ctx(ctx);
 870         return ret;
 871 }
 872
 873 static ssize_t ucma_leave_multicast(struct ucma_file *file,
 874                                     const char __user *inbuf,
 875                                     int in_len, int out_len)
 876 {
 877         struct rdma_ucm_destroy_id cmd;
 878         struct rdma_ucm_destroy_id_resp resp;
 879         struct ucma_multicast *mc;
 880         int ret = 0;
 881
 882         if (out_len < sizeof(resp))
 883                 return -ENOSPC;
 884
 885         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 886                 return -EFAULT;
 887
 888         mutex_lock(&mut);
 889         mc = idr_find(&multicast_idr, cmd.id);
 890         if (!mc)
 891                 mc = ERR_PTR(-ENOENT);
 892         else if (mc->ctx->file != file)
 893                 mc = ERR_PTR(-EINVAL);
 894         else {
 895                 idr_remove(&multicast_idr, mc->id);
 896                 atomic_inc(&mc->ctx->ref);
 897         }
 898         mutex_unlock(&mut);
 899
 900         if (IS_ERR(mc)) {
 901                 ret = PTR_ERR(mc);
 902                 goto out;
 903         }
 904
 905         rdma_leave_multicast(mc->ctx->cm_id, &mc->addr);
 906         mutex_lock(&mc->ctx->file->mut);
 907         ucma_cleanup_mc_events(mc);
 908         list_del(&mc->list);
 909         mutex_unlock(&mc->ctx->file->mut);
 910
 911         ucma_put_ctx(mc->ctx);
 912         resp.events_reported = mc->events_reported;
 913         kfree(mc);
 914
 915         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 916                          &resp, sizeof(resp)))
 917                 ret = -EFAULT;
 918 out:
 919         return ret;
 920 }
 921
 922 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
 923                                    const char __user *inbuf,
 924                                    int in_len, int out_len) = {
 925         [RDMA_USER_CM_CMD_CREATE_ID]    = ucma_create_id,
 926         [RDMA_USER_CM_CMD_DESTROY_ID]   = ucma_destroy_id,
 927         [RDMA_USER_CM_CMD_BIND_ADDR]    = ucma_bind_addr,
 928         [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
 929         [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
 930         [RDMA_USER_CM_CMD_QUERY_ROUTE]  = ucma_query_route,
 931         [RDMA_USER_CM_CMD_CONNECT]      = ucma_connect,
 932         [RDMA_USER_CM_CMD_LISTEN]       = ucma_listen,
 933         [RDMA_USER_CM_CMD_ACCEPT]       = ucma_accept,
 934         [RDMA_USER_CM_CMD_REJECT]       = ucma_reject,
 935         [RDMA_USER_CM_CMD_DISCONNECT]   = ucma_disconnect,
 936         [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
 937         [RDMA_USER_CM_CMD_GET_EVENT]    = ucma_get_event,
 938         [RDMA_USER_CM_CMD_GET_OPTION]   = NULL,
 939         [RDMA_USER_CM_CMD_SET_OPTION]   = NULL,
 940         [RDMA_USER_CM_CMD_NOTIFY]       = ucma_notify,
 941         [RDMA_USER_CM_CMD_JOIN_MCAST]   = ucma_join_multicast,
 942         [RDMA_USER_CM_CMD_LEAVE_MCAST]  = ucma_leave_multicast,
 943 };
 944
 945 static ssize_t ucma_write(struct file *filp, const char __user *buf,
 946                           size_t len, loff_t *pos)
 947 {
 948         struct ucma_file *file = filp->private_data;
 949         struct rdma_ucm_cmd_hdr hdr;
 950         ssize_t ret;
 951
 952         if (len < sizeof(hdr))
 953                 return -EINVAL;
 954
 955         if (copy_from_user(&hdr, buf, sizeof(hdr)))
 956                 return -EFAULT;
 957
 958         if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
 959                 return -EINVAL;
 960
 961         if (hdr.in + sizeof(hdr) > len)
 962                 return -EINVAL;
 963
 964         if (!ucma_cmd_table[hdr.cmd])
 965                 return -ENOSYS;
 966
 967         ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
 968         if (!ret)
 969                 ret = len;
 970
 971         return ret;
 972 }
 973
 974 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
 975 {
 976         struct ucma_file *file = filp->private_data;
 977         unsigned int mask = 0;
 978
 979         poll_wait(filp, &file->poll_wait, wait);
 980
 981         if (!list_empty(&file->event_list))
 982                 mask = POLLIN | POLLRDNORM;
 983
 984         return mask;
 985 }
 986
 987 static int ucma_open(struct inode *inode, struct file *filp)
 988 {
 989         struct ucma_file *file;
 990
 991         file = kmalloc(sizeof *file, GFP_KERNEL);
 992         if (!file)
 993                 return -ENOMEM;
 994
 995         INIT_LIST_HEAD(&file->event_list);
 996         INIT_LIST_HEAD(&file->ctx_list);
 997         init_waitqueue_head(&file->poll_wait);
 998         mutex_init(&file->mut);
 999
1000         filp->private_data = file;
1001         file->filp = filp;
1002         return 0;
1003 }
1004
1005 static int ucma_close(struct inode *inode, struct file *filp)
1006 {
1007         struct ucma_file *file = filp->private_data;
1008         struct ucma_context *ctx, *tmp;
1009
1010         mutex_lock(&file->mut);
1011         list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1012                 mutex_unlock(&file->mut);
1013
1014                 mutex_lock(&mut);
1015                 idr_remove(&ctx_idr, ctx->id);
1016                 mutex_unlock(&mut);
1017
1018                 ucma_free_ctx(ctx);
1019                 mutex_lock(&file->mut);
1020         }
1021         mutex_unlock(&file->mut);
1022         kfree(file);
1023         return 0;
1024 }
1025
1026 static const struct file_operations ucma_fops = {
1027         .owner   = THIS_MODULE,
1028         .open    = ucma_open,
1029         .release = ucma_close,
1030         .write   = ucma_write,
1031         .poll    = ucma_poll,
1032 };
1033
1034 static struct miscdevice ucma_misc = {
1035         .minor  = MISC_DYNAMIC_MINOR,
1036         .name   = "rdma_cm",
1037         .fops   = &ucma_fops,
1038 };
1039
1040 static ssize_t show_abi_version(struct device *dev,
1041                                 struct device_attribute *attr,
1042                                 char *buf)
1043 {
1044         return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1045 }
1046 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1047
1048 static int __init ucma_init(void)
1049 {
1050         int ret;
1051
1052         ret = misc_register(&ucma_misc);
1053         if (ret)
1054                 return ret;
1055
1056         ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1057         if (ret) {
1058                 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1059                 goto err;
1060         }
1061         return 0;
1062 err:
1063         misc_deregister(&ucma_misc);
1064         return ret;
1065 }
1066
1067 static void __exit ucma_cleanup(void)
1068 {
1069         device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1070         misc_deregister(&ucma_misc);
1071         idr_destroy(&ctx_idr);
1072 }
1073
1074 module_init(ucma_init);
1075 module_exit(ucma_cleanup);