git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/core/ucm.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  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  * $Id: ucm.c 2594 2005-06-13 19:46:02Z libor $
  33  */
  34 #include <linux/init.h>
  35 #include <linux/fs.h>
  36 #include <linux/module.h>
  37 #include <linux/device.h>
  38 #include <linux/err.h>
  39 #include <linux/poll.h>
  40 #include <linux/file.h>
  41 #include <linux/mount.h>
  42 #include <linux/cdev.h>
  43
  44 #include <asm/uaccess.h>
  45
  46 #include "ucm.h"
  47
  48 MODULE_AUTHOR("Libor Michalek");
  49 MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
  50 MODULE_LICENSE("Dual BSD/GPL");
  51
  52 static int ucm_debug_level;
  53
  54 module_param_named(debug_level, ucm_debug_level, int, 0644);
  55 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  56
  57 enum {
  58         IB_UCM_MAJOR = 231,
  59         IB_UCM_MINOR = 255
  60 };
  61
  62 #define IB_UCM_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_MINOR)
  63
  64 #define PFX "UCM: "
  65
  66 #define ucm_dbg(format, arg...)                 \
  67         do {                                    \
  68                 if (ucm_debug_level > 0)        \
  69                         printk(KERN_DEBUG PFX format, ## arg); \
  70         } while (0)
  71
  72 static struct semaphore ctx_id_mutex;
  73 static struct idr       ctx_id_table;
  74 static int              ctx_id_rover = 0;
  75
  76 static struct ib_ucm_context *ib_ucm_ctx_get(int id)
  77 {
  78         struct ib_ucm_context *ctx;
  79
  80         down(&ctx_id_mutex);
  81         ctx = idr_find(&ctx_id_table, id);
  82         if (ctx)
  83                 ctx->ref++;
  84         up(&ctx_id_mutex);
  85
  86         return ctx;
  87 }
  88
  89 static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
  90 {
  91         struct ib_ucm_event *uevent;
  92
  93         down(&ctx_id_mutex);
  94
  95         ctx->ref--;
  96         if (!ctx->ref)
  97                 idr_remove(&ctx_id_table, ctx->id);
  98
  99         up(&ctx_id_mutex);
 100
 101         if (ctx->ref)
 102                 return;
 103
 104         down(&ctx->file->mutex);
 105
 106         list_del(&ctx->file_list);
 107         while (!list_empty(&ctx->events)) {
 108
 109                 uevent = list_entry(ctx->events.next,
 110                                     struct ib_ucm_event, ctx_list);
 111                 list_del(&uevent->file_list);
 112                 list_del(&uevent->ctx_list);
 113
 114                 /* clear incoming connections. */
 115                 if (uevent->cm_id)
 116                         ib_destroy_cm_id(uevent->cm_id);
 117
 118                 kfree(uevent);
 119         }
 120
 121         up(&ctx->file->mutex);
 122
 123         ucm_dbg("Destroyed CM ID <%d>\n", ctx->id);
 124
 125         ib_destroy_cm_id(ctx->cm_id);
 126         kfree(ctx);
 127 }
 128
 129 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
 130 {
 131         struct ib_ucm_context *ctx;
 132         int result;
 133
 134         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
 135         if (!ctx)
 136                 return NULL;
 137
 138         ctx->ref  = 1; /* user reference */
 139         ctx->file = file;
 140
 141         INIT_LIST_HEAD(&ctx->events);
 142         init_MUTEX(&ctx->mutex);
 143
 144         list_add_tail(&ctx->file_list, &file->ctxs);
 145
 146         ctx_id_rover = (ctx_id_rover + 1) & INT_MAX;
 147 retry:
 148         result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
 149         if (!result)
 150                 goto error;
 151
 152         down(&ctx_id_mutex);
 153         result = idr_get_new_above(&ctx_id_table, ctx, ctx_id_rover, &ctx->id);
 154         up(&ctx_id_mutex);
 155
 156         if (result == -EAGAIN)
 157                 goto retry;
 158         if (result)
 159                 goto error;
 160
 161         ucm_dbg("Allocated CM ID <%d>\n", ctx->id);
 162
 163         return ctx;
 164 error:
 165         list_del(&ctx->file_list);
 166         kfree(ctx);
 167
 168         return NULL;
 169 }
 170 /*
 171  * Event portion of the API, handle CM events
 172  * and allow event polling.
 173  */
 174 static void ib_ucm_event_path_get(struct ib_ucm_path_rec *upath,
 175                                   struct ib_sa_path_rec  *kpath)
 176 {
 177         if (!kpath || !upath)
 178                 return;
 179
 180         memcpy(upath->dgid, kpath->dgid.raw, sizeof(union ib_gid));
 181         memcpy(upath->sgid, kpath->sgid.raw, sizeof(union ib_gid));
 182
 183         upath->dlid             = kpath->dlid;
 184         upath->slid             = kpath->slid;
 185         upath->raw_traffic      = kpath->raw_traffic;
 186         upath->flow_label       = kpath->flow_label;
 187         upath->hop_limit        = kpath->hop_limit;
 188         upath->traffic_class    = kpath->traffic_class;
 189         upath->reversible       = kpath->reversible;
 190         upath->numb_path        = kpath->numb_path;
 191         upath->pkey             = kpath->pkey;
 192         upath->sl               = kpath->sl;
 193         upath->mtu_selector     = kpath->mtu_selector;
 194         upath->mtu              = kpath->mtu;
 195         upath->rate_selector    = kpath->rate_selector;
 196         upath->rate             = kpath->rate;
 197         upath->packet_life_time = kpath->packet_life_time;
 198         upath->preference       = kpath->preference;
 199
 200         upath->packet_life_time_selector =
 201                 kpath->packet_life_time_selector;
 202 }
 203
 204 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
 205                                  struct ib_cm_req_event_param *kreq)
 206 {
 207         ureq->listen_id = (long)kreq->listen_id->context;
 208
 209         ureq->remote_ca_guid             = kreq->remote_ca_guid;
 210         ureq->remote_qkey                = kreq->remote_qkey;
 211         ureq->remote_qpn                 = kreq->remote_qpn;
 212         ureq->qp_type                    = kreq->qp_type;
 213         ureq->starting_psn               = kreq->starting_psn;
 214         ureq->responder_resources        = kreq->responder_resources;
 215         ureq->initiator_depth            = kreq->initiator_depth;
 216         ureq->local_cm_response_timeout  = kreq->local_cm_response_timeout;
 217         ureq->flow_control               = kreq->flow_control;
 218         ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
 219         ureq->retry_count                = kreq->retry_count;
 220         ureq->rnr_retry_count            = kreq->rnr_retry_count;
 221         ureq->srq                        = kreq->srq;
 222
 223         ib_ucm_event_path_get(&ureq->primary_path, kreq->primary_path);
 224         ib_ucm_event_path_get(&ureq->alternate_path, kreq->alternate_path);
 225 }
 226
 227 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
 228                                  struct ib_cm_rep_event_param *krep)
 229 {
 230         urep->remote_ca_guid      = krep->remote_ca_guid;
 231         urep->remote_qkey         = krep->remote_qkey;
 232         urep->remote_qpn          = krep->remote_qpn;
 233         urep->starting_psn        = krep->starting_psn;
 234         urep->responder_resources = krep->responder_resources;
 235         urep->initiator_depth     = krep->initiator_depth;
 236         urep->target_ack_delay    = krep->target_ack_delay;
 237         urep->failover_accepted   = krep->failover_accepted;
 238         urep->flow_control        = krep->flow_control;
 239         urep->rnr_retry_count     = krep->rnr_retry_count;
 240         urep->srq                 = krep->srq;
 241 }
 242
 243 static void ib_ucm_event_rej_get(struct ib_ucm_rej_event_resp *urej,
 244                                  struct ib_cm_rej_event_param *krej)
 245 {
 246         urej->reason = krej->reason;
 247 }
 248
 249 static void ib_ucm_event_mra_get(struct ib_ucm_mra_event_resp *umra,
 250                                  struct ib_cm_mra_event_param *kmra)
 251 {
 252         umra->timeout = kmra->service_timeout;
 253 }
 254
 255 static void ib_ucm_event_lap_get(struct ib_ucm_lap_event_resp *ulap,
 256                                  struct ib_cm_lap_event_param *klap)
 257 {
 258         ib_ucm_event_path_get(&ulap->path, klap->alternate_path);
 259 }
 260
 261 static void ib_ucm_event_apr_get(struct ib_ucm_apr_event_resp *uapr,
 262                                  struct ib_cm_apr_event_param *kapr)
 263 {
 264         uapr->status = kapr->ap_status;
 265 }
 266
 267 static void ib_ucm_event_sidr_req_get(struct ib_ucm_sidr_req_event_resp *ureq,
 268                                       struct ib_cm_sidr_req_event_param *kreq)
 269 {
 270         ureq->listen_id = (long)kreq->listen_id->context;
 271         ureq->pkey      = kreq->pkey;
 272 }
 273
 274 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
 275                                       struct ib_cm_sidr_rep_event_param *krep)
 276 {
 277         urep->status = krep->status;
 278         urep->qkey   = krep->qkey;
 279         urep->qpn    = krep->qpn;
 280 };
 281
 282 static int ib_ucm_event_process(struct ib_cm_event *evt,
 283                                 struct ib_ucm_event *uvt)
 284 {
 285         void *info = NULL;
 286         int result;
 287
 288         switch (evt->event) {
 289         case IB_CM_REQ_RECEIVED:
 290                 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
 291                                      &evt->param.req_rcvd);
 292                 uvt->data_len      = IB_CM_REQ_PRIVATE_DATA_SIZE;
 293                 uvt->resp.present |= (evt->param.req_rcvd.primary_path ?
 294                                       IB_UCM_PRES_PRIMARY : 0);
 295                 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
 296                                       IB_UCM_PRES_ALTERNATE : 0);
 297                 break;
 298         case IB_CM_REP_RECEIVED:
 299                 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
 300                                      &evt->param.rep_rcvd);
 301                 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
 302
 303                 break;
 304         case IB_CM_RTU_RECEIVED:
 305                 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
 306                 uvt->resp.u.send_status = evt->param.send_status;
 307
 308                 break;
 309         case IB_CM_DREQ_RECEIVED:
 310                 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
 311                 uvt->resp.u.send_status = evt->param.send_status;
 312
 313                 break;
 314         case IB_CM_DREP_RECEIVED:
 315                 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
 316                 uvt->resp.u.send_status = evt->param.send_status;
 317
 318                 break;
 319         case IB_CM_MRA_RECEIVED:
 320                 ib_ucm_event_mra_get(&uvt->resp.u.mra_resp,
 321                                      &evt->param.mra_rcvd);
 322                 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
 323
 324                 break;
 325         case IB_CM_REJ_RECEIVED:
 326                 ib_ucm_event_rej_get(&uvt->resp.u.rej_resp,
 327                                      &evt->param.rej_rcvd);
 328                 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
 329                 uvt->info_len = evt->param.rej_rcvd.ari_length;
 330                 info          = evt->param.rej_rcvd.ari;
 331
 332                 break;
 333         case IB_CM_LAP_RECEIVED:
 334                 ib_ucm_event_lap_get(&uvt->resp.u.lap_resp,
 335                                      &evt->param.lap_rcvd);
 336                 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
 337                 uvt->resp.present |= (evt->param.lap_rcvd.alternate_path ?
 338                                       IB_UCM_PRES_ALTERNATE : 0);
 339                 break;
 340         case IB_CM_APR_RECEIVED:
 341                 ib_ucm_event_apr_get(&uvt->resp.u.apr_resp,
 342                                      &evt->param.apr_rcvd);
 343                 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
 344                 uvt->info_len = evt->param.apr_rcvd.info_len;
 345                 info          = evt->param.apr_rcvd.apr_info;
 346
 347                 break;
 348         case IB_CM_SIDR_REQ_RECEIVED:
 349                 ib_ucm_event_sidr_req_get(&uvt->resp.u.sidr_req_resp,
 350                                           &evt->param.sidr_req_rcvd);
 351                 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
 352
 353                 break;
 354         case IB_CM_SIDR_REP_RECEIVED:
 355                 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
 356                                           &evt->param.sidr_rep_rcvd);
 357                 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
 358                 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
 359                 info          = evt->param.sidr_rep_rcvd.info;
 360
 361                 break;
 362         default:
 363                 uvt->resp.u.send_status = evt->param.send_status;
 364
 365                 break;
 366         }
 367
 368         if (uvt->data_len && evt->private_data) {
 369
 370                 uvt->data = kmalloc(uvt->data_len, GFP_KERNEL);
 371                 if (!uvt->data) {
 372                         result = -ENOMEM;
 373                         goto error;
 374                 }
 375
 376                 memcpy(uvt->data, evt->private_data, uvt->data_len);
 377                 uvt->resp.present |= IB_UCM_PRES_DATA;
 378         }
 379
 380         if (uvt->info_len && info) {
 381
 382                 uvt->info = kmalloc(uvt->info_len, GFP_KERNEL);
 383                 if (!uvt->info) {
 384                         result = -ENOMEM;
 385                         goto error;
 386                 }
 387
 388                 memcpy(uvt->info, info, uvt->info_len);
 389                 uvt->resp.present |= IB_UCM_PRES_INFO;
 390         }
 391
 392         return 0;
 393 error:
 394         kfree(uvt->info);
 395         kfree(uvt->data);
 396         return result;
 397 }
 398
 399 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
 400                                 struct ib_cm_event *event)
 401 {
 402         struct ib_ucm_event *uevent;
 403         struct ib_ucm_context *ctx;
 404         int result = 0;
 405         int id;
 406         /*
 407          * lookup correct context based on event type.
 408          */
 409         switch (event->event) {
 410         case IB_CM_REQ_RECEIVED:
 411                 id = (long)event->param.req_rcvd.listen_id->context;
 412                 break;
 413         case IB_CM_SIDR_REQ_RECEIVED:
 414                 id = (long)event->param.sidr_req_rcvd.listen_id->context;
 415                 break;
 416         default:
 417                 id = (long)cm_id->context;
 418                 break;
 419         }
 420
 421         ucm_dbg("Event. CM ID <%d> event <%d>\n", id, event->event);
 422
 423         ctx = ib_ucm_ctx_get(id);
 424         if (!ctx)
 425                 return -ENOENT;
 426
 427         if (event->event == IB_CM_REQ_RECEIVED ||
 428             event->event == IB_CM_SIDR_REQ_RECEIVED)
 429                 id = IB_UCM_CM_ID_INVALID;
 430
 431         uevent = kmalloc(sizeof(*uevent), GFP_KERNEL);
 432         if (!uevent) {
 433                 result = -ENOMEM;
 434                 goto done;
 435         }
 436
 437         memset(uevent, 0, sizeof(*uevent));
 438
 439         uevent->resp.id    = id;
 440         uevent->resp.event = event->event;
 441
 442         result = ib_ucm_event_process(event, uevent);
 443         if (result)
 444                 goto done;
 445
 446         uevent->ctx   = ctx;
 447         uevent->cm_id = ((event->event == IB_CM_REQ_RECEIVED ||
 448                           event->event == IB_CM_SIDR_REQ_RECEIVED ) ?
 449                          cm_id : NULL);
 450
 451         down(&ctx->file->mutex);
 452
 453         list_add_tail(&uevent->file_list, &ctx->file->events);
 454         list_add_tail(&uevent->ctx_list, &ctx->events);
 455
 456         wake_up_interruptible(&ctx->file->poll_wait);
 457
 458         up(&ctx->file->mutex);
 459 done:
 460         ctx->error = result;
 461         ib_ucm_ctx_put(ctx); /* func reference */
 462         return result;
 463 }
 464
 465 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
 466                             const char __user *inbuf,
 467                             int in_len, int out_len)
 468 {
 469         struct ib_ucm_context *ctx;
 470         struct ib_ucm_event_get cmd;
 471         struct ib_ucm_event *uevent = NULL;
 472         int result = 0;
 473         DEFINE_WAIT(wait);
 474
 475         if (out_len < sizeof(struct ib_ucm_event_resp))
 476                 return -ENOSPC;
 477
 478         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 479                 return -EFAULT;
 480         /*
 481          * wait
 482          */
 483         down(&file->mutex);
 484
 485         while (list_empty(&file->events)) {
 486
 487                 if (file->filp->f_flags & O_NONBLOCK) {
 488                         result = -EAGAIN;
 489                         break;
 490                 }
 491
 492                 if (signal_pending(current)) {
 493                         result = -ERESTARTSYS;
 494                         break;
 495                 }
 496
 497                 prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE);
 498
 499                 up(&file->mutex);
 500                 schedule();
 501                 down(&file->mutex);
 502
 503                 finish_wait(&file->poll_wait, &wait);
 504         }
 505
 506         if (result)
 507                 goto done;
 508
 509         uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
 510
 511         if (!uevent->cm_id)
 512                 goto user;
 513
 514         ctx = ib_ucm_ctx_alloc(file);
 515         if (!ctx) {
 516                 result = -ENOMEM;
 517                 goto done;
 518         }
 519
 520         ctx->cm_id             = uevent->cm_id;
 521         ctx->cm_id->cm_handler = ib_ucm_event_handler;
 522         ctx->cm_id->context    = (void *)(unsigned long)ctx->id;
 523
 524         uevent->resp.id = ctx->id;
 525
 526 user:
 527         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 528                          &uevent->resp, sizeof(uevent->resp))) {
 529                 result = -EFAULT;
 530                 goto done;
 531         }
 532
 533         if (uevent->data) {
 534
 535                 if (cmd.data_len < uevent->data_len) {
 536                         result = -ENOMEM;
 537                         goto done;
 538                 }
 539
 540                 if (copy_to_user((void __user *)(unsigned long)cmd.data,
 541                                  uevent->data, uevent->data_len)) {
 542                         result = -EFAULT;
 543                         goto done;
 544                 }
 545         }
 546
 547         if (uevent->info) {
 548
 549                 if (cmd.info_len < uevent->info_len) {
 550                         result = -ENOMEM;
 551                         goto done;
 552                 }
 553
 554                 if (copy_to_user((void __user *)(unsigned long)cmd.info,
 555                                  uevent->info, uevent->info_len)) {
 556                         result = -EFAULT;
 557                         goto done;
 558                 }
 559         }
 560
 561         list_del(&uevent->file_list);
 562         list_del(&uevent->ctx_list);
 563
 564         kfree(uevent->data);
 565         kfree(uevent->info);
 566         kfree(uevent);
 567 done:
 568         up(&file->mutex);
 569         return result;
 570 }
 571
 572
 573 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
 574                                 const char __user *inbuf,
 575                                 int in_len, int out_len)
 576 {
 577         struct ib_ucm_create_id cmd;
 578         struct ib_ucm_create_id_resp resp;
 579         struct ib_ucm_context *ctx;
 580         int result;
 581
 582         if (out_len < sizeof(resp))
 583                 return -ENOSPC;
 584
 585         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 586                 return -EFAULT;
 587
 588         ctx = ib_ucm_ctx_alloc(file);
 589         if (!ctx)
 590                 return -ENOMEM;
 591
 592         ctx->cm_id = ib_create_cm_id(ib_ucm_event_handler,
 593                                      (void *)(unsigned long)ctx->id);
 594         if (!ctx->cm_id) {
 595                 result = -ENOMEM;
 596                 goto err_cm;
 597         }
 598
 599         resp.id = ctx->id;
 600         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 601                          &resp, sizeof(resp))) {
 602                 result = -EFAULT;
 603                 goto err_ret;
 604         }
 605
 606         return 0;
 607 err_ret:
 608         ib_destroy_cm_id(ctx->cm_id);
 609 err_cm:
 610         ib_ucm_ctx_put(ctx); /* user reference */
 611
 612         return result;
 613 }
 614
 615 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
 616                                  const char __user *inbuf,
 617                                  int in_len, int out_len)
 618 {
 619         struct ib_ucm_destroy_id cmd;
 620         struct ib_ucm_context *ctx;
 621
 622         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 623                 return -EFAULT;
 624
 625         ctx = ib_ucm_ctx_get(cmd.id);
 626         if (!ctx)
 627                 return -ENOENT;
 628
 629         ib_ucm_ctx_put(ctx); /* user reference */
 630         ib_ucm_ctx_put(ctx); /* func reference */
 631
 632         return 0;
 633 }
 634
 635 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
 636                               const char __user *inbuf,
 637                               int in_len, int out_len)
 638 {
 639         struct ib_ucm_attr_id_resp resp;
 640         struct ib_ucm_attr_id cmd;
 641         struct ib_ucm_context *ctx;
 642         int result = 0;
 643
 644         if (out_len < sizeof(resp))
 645                 return -ENOSPC;
 646
 647         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 648                 return -EFAULT;
 649
 650         ctx = ib_ucm_ctx_get(cmd.id);
 651         if (!ctx)
 652                 return -ENOENT;
 653
 654         down(&ctx->file->mutex);
 655         if (ctx->file != file) {
 656                 result = -EINVAL;
 657                 goto done;
 658         }
 659
 660         resp.service_id   = ctx->cm_id->service_id;
 661         resp.service_mask = ctx->cm_id->service_mask;
 662         resp.local_id     = ctx->cm_id->local_id;
 663         resp.remote_id    = ctx->cm_id->remote_id;
 664
 665         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 666                          &resp, sizeof(resp)))
 667                 result = -EFAULT;
 668
 669 done:
 670         up(&ctx->file->mutex);
 671         ib_ucm_ctx_put(ctx); /* func reference */
 672         return result;
 673 }
 674
 675 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
 676                              const char __user *inbuf,
 677                              int in_len, int out_len)
 678 {
 679         struct ib_ucm_listen cmd;
 680         struct ib_ucm_context *ctx;
 681         int result;
 682
 683         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 684                 return -EFAULT;
 685
 686         ctx = ib_ucm_ctx_get(cmd.id);
 687         if (!ctx)
 688                 return -ENOENT;
 689
 690         down(&ctx->file->mutex);
 691         if (ctx->file != file)
 692                 result = -EINVAL;
 693         else
 694                 result = ib_cm_listen(ctx->cm_id, cmd.service_id,
 695                                       cmd.service_mask);
 696
 697         up(&ctx->file->mutex);
 698         ib_ucm_ctx_put(ctx); /* func reference */
 699         return result;
 700 }
 701
 702 static ssize_t ib_ucm_establish(struct ib_ucm_file *file,
 703                                 const char __user *inbuf,
 704                                 int in_len, int out_len)
 705 {
 706         struct ib_ucm_establish cmd;
 707         struct ib_ucm_context *ctx;
 708         int result;
 709
 710         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 711                 return -EFAULT;
 712
 713         ctx = ib_ucm_ctx_get(cmd.id);
 714         if (!ctx)
 715                 return -ENOENT;
 716
 717         down(&ctx->file->mutex);
 718         if (ctx->file != file)
 719                 result = -EINVAL;
 720         else
 721                 result = ib_cm_establish(ctx->cm_id);
 722
 723         up(&ctx->file->mutex);
 724         ib_ucm_ctx_put(ctx); /* func reference */
 725         return result;
 726 }
 727
 728 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
 729 {
 730         void *data;
 731
 732         *dest = NULL;
 733
 734         if (!len)
 735                 return 0;
 736
 737         data = kmalloc(len, GFP_KERNEL);
 738         if (!data)
 739                 return -ENOMEM;
 740
 741         if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
 742                 kfree(data);
 743                 return -EFAULT;
 744         }
 745
 746         *dest = data;
 747         return 0;
 748 }
 749
 750 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
 751 {
 752         struct ib_ucm_path_rec ucm_path;
 753         struct ib_sa_path_rec  *sa_path;
 754
 755         *path = NULL;
 756
 757         if (!src)
 758                 return 0;
 759
 760         sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
 761         if (!sa_path)
 762                 return -ENOMEM;
 763
 764         if (copy_from_user(&ucm_path, (void __user *)(unsigned long)src,
 765                            sizeof(ucm_path))) {
 766
 767                 kfree(sa_path);
 768                 return -EFAULT;
 769         }
 770
 771         memcpy(sa_path->dgid.raw, ucm_path.dgid, sizeof(union ib_gid));
 772         memcpy(sa_path->sgid.raw, ucm_path.sgid, sizeof(union ib_gid));
 773
 774         sa_path->dlid             = ucm_path.dlid;
 775         sa_path->slid             = ucm_path.slid;
 776         sa_path->raw_traffic      = ucm_path.raw_traffic;
 777         sa_path->flow_label       = ucm_path.flow_label;
 778         sa_path->hop_limit        = ucm_path.hop_limit;
 779         sa_path->traffic_class    = ucm_path.traffic_class;
 780         sa_path->reversible       = ucm_path.reversible;
 781         sa_path->numb_path        = ucm_path.numb_path;
 782         sa_path->pkey             = ucm_path.pkey;
 783         sa_path->sl               = ucm_path.sl;
 784         sa_path->mtu_selector     = ucm_path.mtu_selector;
 785         sa_path->mtu              = ucm_path.mtu;
 786         sa_path->rate_selector    = ucm_path.rate_selector;
 787         sa_path->rate             = ucm_path.rate;
 788         sa_path->packet_life_time = ucm_path.packet_life_time;
 789         sa_path->preference       = ucm_path.preference;
 790
 791         sa_path->packet_life_time_selector =
 792                 ucm_path.packet_life_time_selector;
 793
 794         *path = sa_path;
 795         return 0;
 796 }
 797
 798 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
 799                                const char __user *inbuf,
 800                                int in_len, int out_len)
 801 {
 802         struct ib_cm_req_param param;
 803         struct ib_ucm_context *ctx;
 804         struct ib_ucm_req cmd;
 805         int result;
 806
 807         param.private_data   = NULL;
 808         param.primary_path   = NULL;
 809         param.alternate_path = NULL;
 810
 811         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 812                 return -EFAULT;
 813
 814         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
 815         if (result)
 816                 goto done;
 817
 818         result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
 819         if (result)
 820                 goto done;
 821
 822         result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
 823         if (result)
 824                 goto done;
 825
 826         param.private_data_len           = cmd.len;
 827         param.service_id                 = cmd.sid;
 828         param.qp_num                     = cmd.qpn;
 829         param.qp_type                    = cmd.qp_type;
 830         param.starting_psn               = cmd.psn;
 831         param.peer_to_peer               = cmd.peer_to_peer;
 832         param.responder_resources        = cmd.responder_resources;
 833         param.initiator_depth            = cmd.initiator_depth;
 834         param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
 835         param.flow_control               = cmd.flow_control;
 836         param.local_cm_response_timeout  = cmd.local_cm_response_timeout;
 837         param.retry_count                = cmd.retry_count;
 838         param.rnr_retry_count            = cmd.rnr_retry_count;
 839         param.max_cm_retries             = cmd.max_cm_retries;
 840         param.srq                        = cmd.srq;
 841
 842         ctx = ib_ucm_ctx_get(cmd.id);
 843         if (!ctx) {
 844                 result = -ENOENT;
 845                 goto done;
 846         }
 847
 848         down(&ctx->file->mutex);
 849         if (ctx->file != file)
 850                 result = -EINVAL;
 851         else
 852                 result = ib_send_cm_req(ctx->cm_id, &param);
 853
 854         up(&ctx->file->mutex);
 855         ib_ucm_ctx_put(ctx); /* func reference */
 856 done:
 857         kfree(param.private_data);
 858         kfree(param.primary_path);
 859         kfree(param.alternate_path);
 860
 861         return result;
 862 }
 863
 864 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
 865                                const char __user *inbuf,
 866                                int in_len, int out_len)
 867 {
 868         struct ib_cm_rep_param param;
 869         struct ib_ucm_context *ctx;
 870         struct ib_ucm_rep cmd;
 871         int result;
 872
 873         param.private_data = NULL;
 874
 875         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 876                 return -EFAULT;
 877
 878         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
 879         if (result)
 880                 return result;
 881
 882         param.qp_num              = cmd.qpn;
 883         param.starting_psn        = cmd.psn;
 884         param.private_data_len    = cmd.len;
 885         param.responder_resources = cmd.responder_resources;
 886         param.initiator_depth     = cmd.initiator_depth;
 887         param.target_ack_delay    = cmd.target_ack_delay;
 888         param.failover_accepted   = cmd.failover_accepted;
 889         param.flow_control        = cmd.flow_control;
 890         param.rnr_retry_count     = cmd.rnr_retry_count;
 891         param.srq                 = cmd.srq;
 892
 893         ctx = ib_ucm_ctx_get(cmd.id);
 894         if (!ctx) {
 895                 result = -ENOENT;
 896                 goto done;
 897         }
 898
 899         down(&ctx->file->mutex);
 900         if (ctx->file != file)
 901                 result = -EINVAL;
 902         else
 903                 result = ib_send_cm_rep(ctx->cm_id, &param);
 904
 905         up(&ctx->file->mutex);
 906         ib_ucm_ctx_put(ctx); /* func reference */
 907 done:
 908         kfree(param.private_data);
 909
 910         return result;
 911 }
 912
 913 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
 914                                         const char __user *inbuf, int in_len,
 915                                         int (*func)(struct ib_cm_id *cm_id,
 916                                                     const void *private_data,
 917                                                     u8 private_data_len))
 918 {
 919         struct ib_ucm_private_data cmd;
 920         struct ib_ucm_context *ctx;
 921         const void *private_data = NULL;
 922         int result;
 923
 924         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 925                 return -EFAULT;
 926
 927         result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
 928         if (result)
 929                 return result;
 930
 931         ctx = ib_ucm_ctx_get(cmd.id);
 932         if (!ctx) {
 933                 result = -ENOENT;
 934                 goto done;
 935         }
 936
 937         down(&ctx->file->mutex);
 938         if (ctx->file != file)
 939                 result = -EINVAL;
 940         else
 941                 result = func(ctx->cm_id, private_data, cmd.len);
 942
 943         up(&ctx->file->mutex);
 944         ib_ucm_ctx_put(ctx); /* func reference */
 945 done:
 946         kfree(private_data);
 947
 948         return result;
 949 }
 950
 951 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
 952                                const char __user *inbuf,
 953                                int in_len, int out_len)
 954 {
 955         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
 956 }
 957
 958 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
 959                                 const char __user *inbuf,
 960                                 int in_len, int out_len)
 961 {
 962         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
 963 }
 964
 965 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
 966                                 const char __user *inbuf,
 967                                 int in_len, int out_len)
 968 {
 969         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
 970 }
 971
 972 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
 973                                 const char __user *inbuf, int in_len,
 974                                 int (*func)(struct ib_cm_id *cm_id,
 975                                             int status,
 976                                             const void *info,
 977                                             u8 info_len,
 978                                             const void *data,
 979                                             u8 data_len))
 980 {
 981         struct ib_ucm_context *ctx;
 982         struct ib_ucm_info cmd;
 983         const void *data = NULL;
 984         const void *info = NULL;
 985         int result;
 986
 987         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 988                 return -EFAULT;
 989
 990         result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
 991         if (result)
 992                 goto done;
 993
 994         result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
 995         if (result)
 996                 goto done;
 997
 998         ctx = ib_ucm_ctx_get(cmd.id);
 999         if (!ctx) {
1000                 result = -ENOENT;
1001                 goto done;
1002         }
1003
1004         down(&ctx->file->mutex);
1005         if (ctx->file != file)
1006                 result = -EINVAL;
1007         else
1008                 result = func(ctx->cm_id, cmd.status,
1009                               info, cmd.info_len,
1010                               data, cmd.data_len);
1011
1012         up(&ctx->file->mutex);
1013         ib_ucm_ctx_put(ctx); /* func reference */
1014 done:
1015         kfree(data);
1016         kfree(info);
1017
1018         return result;
1019 }
1020
1021 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
1022                                const char __user *inbuf,
1023                                int in_len, int out_len)
1024 {
1025         return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
1026 }
1027
1028 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
1029                                const char __user *inbuf,
1030                                int in_len, int out_len)
1031 {
1032         return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
1033 }
1034
1035 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
1036                                const char __user *inbuf,
1037                                int in_len, int out_len)
1038 {
1039         struct ib_ucm_context *ctx;
1040         struct ib_ucm_mra cmd;
1041         const void *data = NULL;
1042         int result;
1043
1044         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1045                 return -EFAULT;
1046
1047         result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
1048         if (result)
1049                 return result;
1050
1051         ctx = ib_ucm_ctx_get(cmd.id);
1052         if (!ctx) {
1053                 result = -ENOENT;
1054                 goto done;
1055         }
1056
1057         down(&ctx->file->mutex);
1058         if (ctx->file != file)
1059                 result = -EINVAL;
1060         else
1061                 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout,
1062                                         data, cmd.len);
1063
1064         up(&ctx->file->mutex);
1065         ib_ucm_ctx_put(ctx); /* func reference */
1066 done:
1067         kfree(data);
1068
1069         return result;
1070 }
1071
1072 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
1073                                const char __user *inbuf,
1074                                int in_len, int out_len)
1075 {
1076         struct ib_ucm_context *ctx;
1077         struct ib_sa_path_rec *path = NULL;
1078         struct ib_ucm_lap cmd;
1079         const void *data = NULL;
1080         int result;
1081
1082         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1083                 return -EFAULT;
1084
1085         result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
1086         if (result)
1087                 goto done;
1088
1089         result = ib_ucm_path_get(&path, cmd.path);
1090         if (result)
1091                 goto done;
1092
1093         ctx = ib_ucm_ctx_get(cmd.id);
1094         if (!ctx) {
1095                 result = -ENOENT;
1096                 goto done;
1097         }
1098
1099         down(&ctx->file->mutex);
1100         if (ctx->file != file)
1101                 result = -EINVAL;
1102         else
1103                 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
1104
1105         up(&ctx->file->mutex);
1106         ib_ucm_ctx_put(ctx); /* func reference */
1107 done:
1108         kfree(data);
1109         kfree(path);
1110
1111         return result;
1112 }
1113
1114 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1115                                     const char __user *inbuf,
1116                                     int in_len, int out_len)
1117 {
1118         struct ib_cm_sidr_req_param param;
1119         struct ib_ucm_context *ctx;
1120         struct ib_ucm_sidr_req cmd;
1121         int result;
1122
1123         param.private_data = NULL;
1124         param.path = NULL;
1125
1126         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1127                 return -EFAULT;
1128
1129         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
1130         if (result)
1131                 goto done;
1132
1133         result = ib_ucm_path_get(&param.path, cmd.path);
1134         if (result)
1135                 goto done;
1136
1137         param.private_data_len = cmd.len;
1138         param.service_id       = cmd.sid;
1139         param.timeout_ms       = cmd.timeout;
1140         param.max_cm_retries   = cmd.max_cm_retries;
1141         param.pkey             = cmd.pkey;
1142
1143         ctx = ib_ucm_ctx_get(cmd.id);
1144         if (!ctx) {
1145                 result = -ENOENT;
1146                 goto done;
1147         }
1148
1149         down(&ctx->file->mutex);
1150         if (ctx->file != file)
1151                 result = -EINVAL;
1152         else
1153                 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1154
1155         up(&ctx->file->mutex);
1156         ib_ucm_ctx_put(ctx); /* func reference */
1157 done:
1158         kfree(param.private_data);
1159         kfree(param.path);
1160
1161         return result;
1162 }
1163
1164 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1165                                     const char __user *inbuf,
1166                                     int in_len, int out_len)
1167 {
1168         struct ib_cm_sidr_rep_param param;
1169         struct ib_ucm_sidr_rep cmd;
1170         struct ib_ucm_context *ctx;
1171         int result;
1172
1173         param.info = NULL;
1174
1175         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1176                 return -EFAULT;
1177
1178         result = ib_ucm_alloc_data(&param.private_data,
1179                                    cmd.data, cmd.data_len);
1180         if (result)
1181                 goto done;
1182
1183         result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1184         if (result)
1185                 goto done;
1186
1187         param.qp_num       = cmd.qpn;
1188         param.qkey           = cmd.qkey;
1189         param.status       = cmd.status;
1190         param.info_length      = cmd.info_len;
1191         param.private_data_len = cmd.data_len;
1192
1193         ctx = ib_ucm_ctx_get(cmd.id);
1194         if (!ctx) {
1195                 result = -ENOENT;
1196                 goto done;
1197         }
1198
1199         down(&ctx->file->mutex);
1200         if (ctx->file != file)
1201                 result = -EINVAL;
1202         else
1203                 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1204
1205         up(&ctx->file->mutex);
1206         ib_ucm_ctx_put(ctx); /* func reference */
1207 done:
1208         kfree(param.private_data);
1209         kfree(param.info);
1210
1211         return result;
1212 }
1213
1214 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1215                                   const char __user *inbuf,
1216                                   int in_len, int out_len) = {
1217         [IB_USER_CM_CMD_CREATE_ID]     = ib_ucm_create_id,
1218         [IB_USER_CM_CMD_DESTROY_ID]    = ib_ucm_destroy_id,
1219         [IB_USER_CM_CMD_ATTR_ID]       = ib_ucm_attr_id,
1220         [IB_USER_CM_CMD_LISTEN]        = ib_ucm_listen,
1221         [IB_USER_CM_CMD_ESTABLISH]     = ib_ucm_establish,
1222         [IB_USER_CM_CMD_SEND_REQ]      = ib_ucm_send_req,
1223         [IB_USER_CM_CMD_SEND_REP]      = ib_ucm_send_rep,
1224         [IB_USER_CM_CMD_SEND_RTU]      = ib_ucm_send_rtu,
1225         [IB_USER_CM_CMD_SEND_DREQ]     = ib_ucm_send_dreq,
1226         [IB_USER_CM_CMD_SEND_DREP]     = ib_ucm_send_drep,
1227         [IB_USER_CM_CMD_SEND_REJ]      = ib_ucm_send_rej,
1228         [IB_USER_CM_CMD_SEND_MRA]      = ib_ucm_send_mra,
1229         [IB_USER_CM_CMD_SEND_LAP]      = ib_ucm_send_lap,
1230         [IB_USER_CM_CMD_SEND_APR]      = ib_ucm_send_apr,
1231         [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1232         [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1233         [IB_USER_CM_CMD_EVENT]         = ib_ucm_event,
1234 };
1235
1236 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1237                             size_t len, loff_t *pos)
1238 {
1239         struct ib_ucm_file *file = filp->private_data;
1240         struct ib_ucm_cmd_hdr hdr;
1241         ssize_t result;
1242
1243         if (len < sizeof(hdr))
1244                 return -EINVAL;
1245
1246         if (copy_from_user(&hdr, buf, sizeof(hdr)))
1247                 return -EFAULT;
1248
1249         ucm_dbg("Write. cmd <%d> in <%d> out <%d> len <%Zu>\n",
1250                 hdr.cmd, hdr.in, hdr.out, len);
1251
1252         if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1253                 return -EINVAL;
1254
1255         if (hdr.in + sizeof(hdr) > len)
1256                 return -EINVAL;
1257
1258         result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1259                                         hdr.in, hdr.out);
1260         if (!result)
1261                 result = len;
1262
1263         return result;
1264 }
1265
1266 static unsigned int ib_ucm_poll(struct file *filp,
1267                                 struct poll_table_struct *wait)
1268 {
1269         struct ib_ucm_file *file = filp->private_data;
1270         unsigned int mask = 0;
1271
1272         poll_wait(filp, &file->poll_wait, wait);
1273
1274         if (!list_empty(&file->events))
1275                 mask = POLLIN | POLLRDNORM;
1276
1277         return mask;
1278 }
1279
1280 static int ib_ucm_open(struct inode *inode, struct file *filp)
1281 {
1282         struct ib_ucm_file *file;
1283
1284         file = kmalloc(sizeof(*file), GFP_KERNEL);
1285         if (!file)
1286                 return -ENOMEM;
1287
1288         INIT_LIST_HEAD(&file->events);
1289         INIT_LIST_HEAD(&file->ctxs);
1290         init_waitqueue_head(&file->poll_wait);
1291
1292         init_MUTEX(&file->mutex);
1293
1294         filp->private_data = file;
1295         file->filp = filp;
1296
1297         ucm_dbg("Created struct\n");
1298
1299         return 0;
1300 }
1301
1302 static int ib_ucm_close(struct inode *inode, struct file *filp)
1303 {
1304         struct ib_ucm_file *file = filp->private_data;
1305         struct ib_ucm_context *ctx;
1306
1307         down(&file->mutex);
1308
1309         while (!list_empty(&file->ctxs)) {
1310
1311                 ctx = list_entry(file->ctxs.next,
1312                                  struct ib_ucm_context, file_list);
1313
1314                 up(&ctx->file->mutex);
1315                 ib_ucm_ctx_put(ctx); /* user reference */
1316                 down(&file->mutex);
1317         }
1318
1319         up(&file->mutex);
1320
1321         kfree(file);
1322
1323         ucm_dbg("Deleted struct\n");
1324         return 0;
1325 }
1326
1327 static struct file_operations ib_ucm_fops = {
1328         .owner   = THIS_MODULE,
1329         .open    = ib_ucm_open,
1330         .release = ib_ucm_close,
1331         .write   = ib_ucm_write,
1332         .poll    = ib_ucm_poll,
1333 };
1334
1335
1336 static struct class *ib_ucm_class;
1337 static struct cdev        ib_ucm_cdev;
1338
1339 static int __init ib_ucm_init(void)
1340 {
1341         int result;
1342
1343         result = register_chrdev_region(IB_UCM_DEV, 1, "infiniband_cm");
1344         if (result) {
1345                 ucm_dbg("Error <%d> registering dev\n", result);
1346                 goto err_chr;
1347         }
1348
1349         cdev_init(&ib_ucm_cdev, &ib_ucm_fops);
1350
1351         result = cdev_add(&ib_ucm_cdev, IB_UCM_DEV, 1);
1352         if (result) {
1353                 ucm_dbg("Error <%d> adding cdev\n", result);
1354                 goto err_cdev;
1355         }
1356
1357         ib_ucm_class = class_create(THIS_MODULE, "infiniband_cm");
1358         if (IS_ERR(ib_ucm_class)) {
1359                 result = PTR_ERR(ib_ucm_class);
1360                 ucm_dbg("Error <%d> creating class\n", result);
1361                 goto err_class;
1362         }
1363
1364         class_device_create(ib_ucm_class, IB_UCM_DEV, NULL, "ucm");
1365
1366         idr_init(&ctx_id_table);
1367         init_MUTEX(&ctx_id_mutex);
1368
1369         return 0;
1370 err_class:
1371         cdev_del(&ib_ucm_cdev);
1372 err_cdev:
1373         unregister_chrdev_region(IB_UCM_DEV, 1);
1374 err_chr:
1375         return result;
1376 }
1377
1378 static void __exit ib_ucm_cleanup(void)
1379 {
1380         class_device_destroy(ib_ucm_class, IB_UCM_DEV);
1381         class_destroy(ib_ucm_class);
1382         cdev_del(&ib_ucm_cdev);
1383         unregister_chrdev_region(IB_UCM_DEV, 1);
1384 }
1385
1386 module_init(ib_ucm_init);
1387 module_exit(ib_ucm_cleanup);