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