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 enum {
  53         IB_UCM_MAJOR = 231,
  54         IB_UCM_MINOR = 255
  55 };
  56
  57 #define IB_UCM_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_MINOR)
  58
  59 static struct semaphore ctx_id_mutex;
  60 static struct idr       ctx_id_table;
  61 static int              ctx_id_rover = 0;
  62
  63 static struct ib_ucm_context *ib_ucm_ctx_get(int id)
  64 {
  65         struct ib_ucm_context *ctx;
  66
  67         down(&ctx_id_mutex);
  68         ctx = idr_find(&ctx_id_table, id);
  69         if (ctx)
  70                 ctx->ref++;
  71         up(&ctx_id_mutex);
  72
  73         return ctx;
  74 }
  75
  76 static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
  77 {
  78         struct ib_ucm_event *uevent;
  79
  80         down(&ctx_id_mutex);
  81
  82         ctx->ref--;
  83         if (!ctx->ref)
  84                 idr_remove(&ctx_id_table, ctx->id);
  85
  86         up(&ctx_id_mutex);
  87
  88         if (ctx->ref)
  89                 return;
  90
  91         down(&ctx->file->mutex);
  92
  93         list_del(&ctx->file_list);
  94         while (!list_empty(&ctx->events)) {
  95
  96                 uevent = list_entry(ctx->events.next,
  97                                     struct ib_ucm_event, ctx_list);
  98                 list_del(&uevent->file_list);
  99                 list_del(&uevent->ctx_list);
 100
 101                 /* clear incoming connections. */
 102                 if (uevent->cm_id)
 103                         ib_destroy_cm_id(uevent->cm_id);
 104
 105                 kfree(uevent);
 106         }
 107
 108         up(&ctx->file->mutex);
 109
 110         printk(KERN_ERR "UCM: Destroyed CM ID <%d>\n", ctx->id);
 111
 112         ib_destroy_cm_id(ctx->cm_id);
 113         kfree(ctx);
 114 }
 115
 116 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
 117 {
 118         struct ib_ucm_context *ctx;
 119         int result;
 120
 121         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
 122         if (!ctx)
 123                 return NULL;
 124
 125         ctx->ref  = 1; /* user reference */
 126         ctx->file = file;
 127
 128         INIT_LIST_HEAD(&ctx->events);
 129         init_MUTEX(&ctx->mutex);
 130
 131         list_add_tail(&ctx->file_list, &file->ctxs);
 132
 133         ctx_id_rover = (ctx_id_rover + 1) & INT_MAX;
 134 retry:
 135         result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
 136         if (!result)
 137                 goto error;
 138
 139         down(&ctx_id_mutex);
 140         result = idr_get_new_above(&ctx_id_table, ctx, ctx_id_rover, &ctx->id);
 141         up(&ctx_id_mutex);
 142
 143         if (result == -EAGAIN)
 144                 goto retry;
 145         if (result)
 146                 goto error;
 147
 148         printk(KERN_ERR "UCM: Allocated CM ID <%d>\n", ctx->id);
 149
 150         return ctx;
 151 error:
 152         list_del(&ctx->file_list);
 153         kfree(ctx);
 154
 155         return NULL;
 156 }
 157 /*
 158  * Event portion of the API, handle CM events
 159  * and allow event polling.
 160  */
 161 static void ib_ucm_event_path_get(struct ib_ucm_path_rec *upath,
 162                                   struct ib_sa_path_rec  *kpath)
 163 {
 164         if (!kpath || !upath)
 165                 return;
 166
 167         memcpy(upath->dgid, kpath->dgid.raw, sizeof(union ib_gid));
 168         memcpy(upath->sgid, kpath->sgid.raw, sizeof(union ib_gid));
 169
 170         upath->dlid             = kpath->dlid;
 171         upath->slid             = kpath->slid;
 172         upath->raw_traffic      = kpath->raw_traffic;
 173         upath->flow_label       = kpath->flow_label;
 174         upath->hop_limit        = kpath->hop_limit;
 175         upath->traffic_class    = kpath->traffic_class;
 176         upath->reversible       = kpath->reversible;
 177         upath->numb_path        = kpath->numb_path;
 178         upath->pkey             = kpath->pkey;
 179         upath->sl               = kpath->sl;
 180         upath->mtu_selector     = kpath->mtu_selector;
 181         upath->mtu              = kpath->mtu;
 182         upath->rate_selector    = kpath->rate_selector;
 183         upath->rate             = kpath->rate;
 184         upath->packet_life_time = kpath->packet_life_time;
 185         upath->preference       = kpath->preference;
 186
 187         upath->packet_life_time_selector =
 188                 kpath->packet_life_time_selector;
 189 }
 190
 191 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
 192                                  struct ib_cm_req_event_param *kreq)
 193 {
 194         ureq->listen_id = (long)kreq->listen_id->context;
 195
 196         ureq->remote_ca_guid             = kreq->remote_ca_guid;
 197         ureq->remote_qkey                = kreq->remote_qkey;
 198         ureq->remote_qpn                 = kreq->remote_qpn;
 199         ureq->qp_type                    = kreq->qp_type;
 200         ureq->starting_psn               = kreq->starting_psn;
 201         ureq->responder_resources        = kreq->responder_resources;
 202         ureq->initiator_depth            = kreq->initiator_depth;
 203         ureq->local_cm_response_timeout  = kreq->local_cm_response_timeout;
 204         ureq->flow_control               = kreq->flow_control;
 205         ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
 206         ureq->retry_count                = kreq->retry_count;
 207         ureq->rnr_retry_count            = kreq->rnr_retry_count;
 208         ureq->srq                        = kreq->srq;
 209
 210         ib_ucm_event_path_get(&ureq->primary_path, kreq->primary_path);
 211         ib_ucm_event_path_get(&ureq->alternate_path, kreq->alternate_path);
 212 }
 213
 214 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
 215                                  struct ib_cm_rep_event_param *krep)
 216 {
 217         urep->remote_ca_guid      = krep->remote_ca_guid;
 218         urep->remote_qkey         = krep->remote_qkey;
 219         urep->remote_qpn          = krep->remote_qpn;
 220         urep->starting_psn        = krep->starting_psn;
 221         urep->responder_resources = krep->responder_resources;
 222         urep->initiator_depth     = krep->initiator_depth;
 223         urep->target_ack_delay    = krep->target_ack_delay;
 224         urep->failover_accepted   = krep->failover_accepted;
 225         urep->flow_control        = krep->flow_control;
 226         urep->rnr_retry_count     = krep->rnr_retry_count;
 227         urep->srq                 = krep->srq;
 228 }
 229
 230 static void ib_ucm_event_rej_get(struct ib_ucm_rej_event_resp *urej,
 231                                  struct ib_cm_rej_event_param *krej)
 232 {
 233         urej->reason = krej->reason;
 234 }
 235
 236 static void ib_ucm_event_mra_get(struct ib_ucm_mra_event_resp *umra,
 237                                  struct ib_cm_mra_event_param *kmra)
 238 {
 239         umra->timeout = kmra->service_timeout;
 240 }
 241
 242 static void ib_ucm_event_lap_get(struct ib_ucm_lap_event_resp *ulap,
 243                                  struct ib_cm_lap_event_param *klap)
 244 {
 245         ib_ucm_event_path_get(&ulap->path, klap->alternate_path);
 246 }
 247
 248 static void ib_ucm_event_apr_get(struct ib_ucm_apr_event_resp *uapr,
 249                                  struct ib_cm_apr_event_param *kapr)
 250 {
 251         uapr->status = kapr->ap_status;
 252 }
 253
 254 static void ib_ucm_event_sidr_req_get(struct ib_ucm_sidr_req_event_resp *ureq,
 255                                       struct ib_cm_sidr_req_event_param *kreq)
 256 {
 257         ureq->listen_id = (long)kreq->listen_id->context;
 258         ureq->pkey      = kreq->pkey;
 259 }
 260
 261 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
 262                                       struct ib_cm_sidr_rep_event_param *krep)
 263 {
 264         urep->status = krep->status;
 265         urep->qkey   = krep->qkey;
 266         urep->qpn    = krep->qpn;
 267 };
 268
 269 static int ib_ucm_event_process(struct ib_cm_event *evt,
 270                                 struct ib_ucm_event *uvt)
 271 {
 272         void *info = NULL;
 273         int result;
 274
 275         switch (evt->event) {
 276         case IB_CM_REQ_RECEIVED:
 277                 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
 278                                      &evt->param.req_rcvd);
 279                 uvt->data_len      = IB_CM_REQ_PRIVATE_DATA_SIZE;
 280                 uvt->resp.present |= (evt->param.req_rcvd.primary_path ?
 281                                       IB_UCM_PRES_PRIMARY : 0);
 282                 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
 283                                       IB_UCM_PRES_ALTERNATE : 0);
 284                 break;
 285         case IB_CM_REP_RECEIVED:
 286                 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
 287                                      &evt->param.rep_rcvd);
 288                 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
 289
 290                 break;
 291         case IB_CM_RTU_RECEIVED:
 292                 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
 293                 uvt->resp.u.send_status = evt->param.send_status;
 294
 295                 break;
 296         case IB_CM_DREQ_RECEIVED:
 297                 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
 298                 uvt->resp.u.send_status = evt->param.send_status;
 299
 300                 break;
 301         case IB_CM_DREP_RECEIVED:
 302                 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
 303                 uvt->resp.u.send_status = evt->param.send_status;
 304
 305                 break;
 306         case IB_CM_MRA_RECEIVED:
 307                 ib_ucm_event_mra_get(&uvt->resp.u.mra_resp,
 308                                      &evt->param.mra_rcvd);
 309                 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
 310
 311                 break;
 312         case IB_CM_REJ_RECEIVED:
 313                 ib_ucm_event_rej_get(&uvt->resp.u.rej_resp,
 314                                      &evt->param.rej_rcvd);
 315                 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
 316                 uvt->info_len = evt->param.rej_rcvd.ari_length;
 317                 info          = evt->param.rej_rcvd.ari;
 318
 319                 break;
 320         case IB_CM_LAP_RECEIVED:
 321                 ib_ucm_event_lap_get(&uvt->resp.u.lap_resp,
 322                                      &evt->param.lap_rcvd);
 323                 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
 324                 uvt->resp.present |= (evt->param.lap_rcvd.alternate_path ?
 325                                       IB_UCM_PRES_ALTERNATE : 0);
 326                 break;
 327         case IB_CM_APR_RECEIVED:
 328                 ib_ucm_event_apr_get(&uvt->resp.u.apr_resp,
 329                                      &evt->param.apr_rcvd);
 330                 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
 331                 uvt->info_len = evt->param.apr_rcvd.info_len;
 332                 info          = evt->param.apr_rcvd.apr_info;
 333
 334                 break;
 335         case IB_CM_SIDR_REQ_RECEIVED:
 336                 ib_ucm_event_sidr_req_get(&uvt->resp.u.sidr_req_resp,
 337                                           &evt->param.sidr_req_rcvd);
 338                 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
 339
 340                 break;
 341         case IB_CM_SIDR_REP_RECEIVED:
 342                 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
 343                                           &evt->param.sidr_rep_rcvd);
 344                 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
 345                 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
 346                 info          = evt->param.sidr_rep_rcvd.info;
 347
 348                 break;
 349         default:
 350                 uvt->resp.u.send_status = evt->param.send_status;
 351
 352                 break;
 353         }
 354
 355         if (uvt->data_len && evt->private_data) {
 356
 357                 uvt->data = kmalloc(uvt->data_len, GFP_KERNEL);
 358                 if (!uvt->data) {
 359                         result = -ENOMEM;
 360                         goto error;
 361                 }
 362
 363                 memcpy(uvt->data, evt->private_data, uvt->data_len);
 364                 uvt->resp.present |= IB_UCM_PRES_DATA;
 365         }
 366
 367         if (uvt->info_len && info) {
 368
 369                 uvt->info = kmalloc(uvt->info_len, GFP_KERNEL);
 370                 if (!uvt->info) {
 371                         result = -ENOMEM;
 372                         goto error;
 373                 }
 374
 375                 memcpy(uvt->info, info, uvt->info_len);
 376                 uvt->resp.present |= IB_UCM_PRES_INFO;
 377         }
 378
 379         return 0;
 380 error:
 381         if (uvt->info)
 382                 kfree(uvt->info);
 383         if (uvt->data)
 384                 kfree(uvt->data);
 385         return result;
 386 }
 387
 388 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
 389                                 struct ib_cm_event *event)
 390 {
 391         struct ib_ucm_event *uevent;
 392         struct ib_ucm_context *ctx;
 393         int result = 0;
 394         int id;
 395         /*
 396          * lookup correct context based on event type.
 397          */
 398         switch (event->event) {
 399         case IB_CM_REQ_RECEIVED:
 400                 id = (long)event->param.req_rcvd.listen_id->context;
 401                 break;
 402         case IB_CM_SIDR_REQ_RECEIVED:
 403                 id = (long)event->param.sidr_req_rcvd.listen_id->context;
 404                 break;
 405         default:
 406                 id = (long)cm_id->context;
 407                 break;
 408         }
 409
 410         printk(KERN_ERR "UCM: Event. CM ID <%d> event <%d>\n",
 411                id, event->event);
 412
 413         ctx = ib_ucm_ctx_get(id);
 414         if (!ctx)
 415                 return -ENOENT;
 416
 417         if (event->event == IB_CM_REQ_RECEIVED ||
 418             event->event == IB_CM_SIDR_REQ_RECEIVED)
 419                 id = IB_UCM_CM_ID_INVALID;
 420
 421         uevent = kmalloc(sizeof(*uevent), GFP_KERNEL);
 422         if (!uevent) {
 423                 result = -ENOMEM;
 424                 goto done;
 425         }
 426
 427         memset(uevent, 0, sizeof(*uevent));
 428
 429         uevent->resp.id    = id;
 430         uevent->resp.event = event->event;
 431
 432         result = ib_ucm_event_process(event, uevent);
 433         if (result)
 434                 goto done;
 435
 436         uevent->ctx   = ctx;
 437         uevent->cm_id = ((event->event == IB_CM_REQ_RECEIVED ||
 438                           event->event == IB_CM_SIDR_REQ_RECEIVED ) ?
 439                          cm_id : NULL);
 440
 441         down(&ctx->file->mutex);
 442
 443         list_add_tail(&uevent->file_list, &ctx->file->events);
 444         list_add_tail(&uevent->ctx_list, &ctx->events);
 445
 446         wake_up_interruptible(&ctx->file->poll_wait);
 447
 448         up(&ctx->file->mutex);
 449 done:
 450         ctx->error = result;
 451         ib_ucm_ctx_put(ctx); /* func reference */
 452         return result;
 453 }
 454
 455 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
 456                             const char __user *inbuf,
 457                             int in_len, int out_len)
 458 {
 459         struct ib_ucm_context *ctx;
 460         struct ib_ucm_event_get cmd;
 461         struct ib_ucm_event *uevent = NULL;
 462         int result = 0;
 463         DEFINE_WAIT(wait);
 464
 465         if (out_len < sizeof(struct ib_ucm_event_resp))
 466                 return -ENOSPC;
 467
 468         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 469                 return -EFAULT;
 470         /*
 471          * wait
 472          */
 473         down(&file->mutex);
 474
 475         while (list_empty(&file->events)) {
 476
 477                 if (file->filp->f_flags & O_NONBLOCK) {
 478                         result = -EAGAIN;
 479                         break;
 480                 }
 481
 482                 if (signal_pending(current)) {
 483                         result = -ERESTARTSYS;
 484                         break;
 485                 }
 486
 487                 prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE);
 488
 489                 up(&file->mutex);
 490                 schedule();
 491                 down(&file->mutex);
 492
 493                 finish_wait(&file->poll_wait, &wait);
 494         }
 495
 496         if (result)
 497                 goto done;
 498
 499         uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
 500
 501         if (!uevent->cm_id)
 502                 goto user;
 503
 504         ctx = ib_ucm_ctx_alloc(file);
 505         if (!ctx) {
 506                 result = -ENOMEM;
 507                 goto done;
 508         }
 509
 510         ctx->cm_id             = uevent->cm_id;
 511         ctx->cm_id->cm_handler = ib_ucm_event_handler;
 512         ctx->cm_id->context    = (void *)(unsigned long)ctx->id;
 513
 514         uevent->resp.id = ctx->id;
 515
 516 user:
 517         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 518                          &uevent->resp, sizeof(uevent->resp))) {
 519                 result = -EFAULT;
 520                 goto done;
 521         }
 522
 523         if (uevent->data) {
 524
 525                 if (cmd.data_len < uevent->data_len) {
 526                         result = -ENOMEM;
 527                         goto done;
 528                 }
 529
 530                 if (copy_to_user((void __user *)(unsigned long)cmd.data,
 531                                  uevent->data, uevent->data_len)) {
 532                         result = -EFAULT;
 533                         goto done;
 534                 }
 535         }
 536
 537         if (uevent->info) {
 538
 539                 if (cmd.info_len < uevent->info_len) {
 540                         result = -ENOMEM;
 541                         goto done;
 542                 }
 543
 544                 if (copy_to_user((void __user *)(unsigned long)cmd.info,
 545                                  uevent->info, uevent->info_len)) {
 546                         result = -EFAULT;
 547                         goto done;
 548                 }
 549         }
 550
 551         list_del(&uevent->file_list);
 552         list_del(&uevent->ctx_list);
 553
 554         if (uevent->data)
 555                 kfree(uevent->data);
 556         if (uevent->info)
 557                 kfree(uevent->info);
 558         kfree(uevent);
 559 done:
 560         up(&file->mutex);
 561         return result;
 562 }
 563
 564
 565 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
 566                                 const char __user *inbuf,
 567                                 int in_len, int out_len)
 568 {
 569         struct ib_ucm_create_id cmd;
 570         struct ib_ucm_create_id_resp resp;
 571         struct ib_ucm_context *ctx;
 572         int result;
 573
 574         if (out_len < sizeof(resp))
 575                 return -ENOSPC;
 576
 577         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 578                 return -EFAULT;
 579
 580         ctx = ib_ucm_ctx_alloc(file);
 581         if (!ctx)
 582                 return -ENOMEM;
 583
 584         ctx->cm_id = ib_create_cm_id(ib_ucm_event_handler,
 585                                      (void *)(unsigned long)ctx->id);
 586         if (!ctx->cm_id) {
 587                 result = -ENOMEM;
 588                 goto err_cm;
 589         }
 590
 591         resp.id = ctx->id;
 592         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 593                          &resp, sizeof(resp))) {
 594                 result = -EFAULT;
 595                 goto err_ret;
 596         }
 597
 598         return 0;
 599 err_ret:
 600         ib_destroy_cm_id(ctx->cm_id);
 601 err_cm:
 602         ib_ucm_ctx_put(ctx); /* user reference */
 603
 604         return result;
 605 }
 606
 607 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
 608                                  const char __user *inbuf,
 609                                  int in_len, int out_len)
 610 {
 611         struct ib_ucm_destroy_id cmd;
 612         struct ib_ucm_context *ctx;
 613
 614         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 615                 return -EFAULT;
 616
 617         ctx = ib_ucm_ctx_get(cmd.id);
 618         if (!ctx)
 619                 return -ENOENT;
 620
 621         ib_ucm_ctx_put(ctx); /* user reference */
 622         ib_ucm_ctx_put(ctx); /* func reference */
 623
 624         return 0;
 625 }
 626
 627 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
 628                               const char __user *inbuf,
 629                               int in_len, int out_len)
 630 {
 631         struct ib_ucm_attr_id_resp resp;
 632         struct ib_ucm_attr_id cmd;
 633         struct ib_ucm_context *ctx;
 634         int result = 0;
 635
 636         if (out_len < sizeof(resp))
 637                 return -ENOSPC;
 638
 639         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 640                 return -EFAULT;
 641
 642         ctx = ib_ucm_ctx_get(cmd.id);
 643         if (!ctx)
 644                 return -ENOENT;
 645
 646         down(&ctx->file->mutex);
 647         if (ctx->file != file) {
 648                 result = -EINVAL;
 649                 goto done;
 650         }
 651
 652         resp.service_id   = ctx->cm_id->service_id;
 653         resp.service_mask = ctx->cm_id->service_mask;
 654         resp.local_id     = ctx->cm_id->local_id;
 655         resp.remote_id    = ctx->cm_id->remote_id;
 656
 657         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 658                          &resp, sizeof(resp)))
 659                 result = -EFAULT;
 660
 661 done:
 662         up(&ctx->file->mutex);
 663         ib_ucm_ctx_put(ctx); /* func reference */
 664         return result;
 665 }
 666
 667 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
 668                              const char __user *inbuf,
 669                              int in_len, int out_len)
 670 {
 671         struct ib_ucm_listen cmd;
 672         struct ib_ucm_context *ctx;
 673         int result;
 674
 675         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 676                 return -EFAULT;
 677
 678         ctx = ib_ucm_ctx_get(cmd.id);
 679         if (!ctx)
 680                 return -ENOENT;
 681
 682         down(&ctx->file->mutex);
 683         if (ctx->file != file)
 684                 result = -EINVAL;
 685         else
 686                 result = ib_cm_listen(ctx->cm_id, cmd.service_id,
 687                                       cmd.service_mask);
 688
 689         up(&ctx->file->mutex);
 690         ib_ucm_ctx_put(ctx); /* func reference */
 691         return result;
 692 }
 693
 694 static ssize_t ib_ucm_establish(struct ib_ucm_file *file,
 695                                 const char __user *inbuf,
 696                                 int in_len, int out_len)
 697 {
 698         struct ib_ucm_establish cmd;
 699         struct ib_ucm_context *ctx;
 700         int result;
 701
 702         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 703                 return -EFAULT;
 704
 705         ctx = ib_ucm_ctx_get(cmd.id);
 706         if (!ctx)
 707                 return -ENOENT;
 708
 709         down(&ctx->file->mutex);
 710         if (ctx->file != file)
 711                 result = -EINVAL;
 712         else
 713                 result = ib_cm_establish(ctx->cm_id);
 714
 715         up(&ctx->file->mutex);
 716         ib_ucm_ctx_put(ctx); /* func reference */
 717         return result;
 718 }
 719
 720 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
 721 {
 722         void *data;
 723
 724         *dest = NULL;
 725
 726         if (!len)
 727                 return 0;
 728
 729         data = kmalloc(len, GFP_KERNEL);
 730         if (!data)
 731                 return -ENOMEM;
 732
 733         if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
 734                 kfree(data);
 735                 return -EFAULT;
 736         }
 737
 738         *dest = data;
 739         return 0;
 740 }
 741
 742 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
 743 {
 744         struct ib_ucm_path_rec ucm_path;
 745         struct ib_sa_path_rec  *sa_path;
 746
 747         *path = NULL;
 748
 749         if (!src)
 750                 return 0;
 751
 752         sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
 753         if (!sa_path)
 754                 return -ENOMEM;
 755
 756         if (copy_from_user(&ucm_path, (void __user *)(unsigned long)src,
 757                            sizeof(ucm_path))) {
 758
 759                 kfree(sa_path);
 760                 return -EFAULT;
 761         }
 762
 763         memcpy(sa_path->dgid.raw, ucm_path.dgid, sizeof(union ib_gid));
 764         memcpy(sa_path->sgid.raw, ucm_path.sgid, sizeof(union ib_gid));
 765
 766         sa_path->dlid             = ucm_path.dlid;
 767         sa_path->slid             = ucm_path.slid;
 768         sa_path->raw_traffic      = ucm_path.raw_traffic;
 769         sa_path->flow_label       = ucm_path.flow_label;
 770         sa_path->hop_limit        = ucm_path.hop_limit;
 771         sa_path->traffic_class    = ucm_path.traffic_class;
 772         sa_path->reversible       = ucm_path.reversible;
 773         sa_path->numb_path        = ucm_path.numb_path;
 774         sa_path->pkey             = ucm_path.pkey;
 775         sa_path->sl               = ucm_path.sl;
 776         sa_path->mtu_selector     = ucm_path.mtu_selector;
 777         sa_path->mtu              = ucm_path.mtu;
 778         sa_path->rate_selector    = ucm_path.rate_selector;
 779         sa_path->rate             = ucm_path.rate;
 780         sa_path->packet_life_time = ucm_path.packet_life_time;
 781         sa_path->preference       = ucm_path.preference;
 782
 783         sa_path->packet_life_time_selector =
 784                 ucm_path.packet_life_time_selector;
 785
 786         *path = sa_path;
 787         return 0;
 788 }
 789
 790 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
 791                                const char __user *inbuf,
 792                                int in_len, int out_len)
 793 {
 794         struct ib_cm_req_param param;
 795         struct ib_ucm_context *ctx;
 796         struct ib_ucm_req cmd;
 797         int result;
 798
 799         param.private_data   = NULL;
 800         param.primary_path   = NULL;
 801         param.alternate_path = NULL;
 802
 803         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 804                 return -EFAULT;
 805
 806         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
 807         if (result)
 808                 goto done;
 809
 810         result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
 811         if (result)
 812                 goto done;
 813
 814         result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
 815         if (result)
 816                 goto done;
 817
 818         param.private_data_len           = cmd.len;
 819         param.service_id                 = cmd.sid;
 820         param.qp_num                     = cmd.qpn;
 821         param.qp_type                    = cmd.qp_type;
 822         param.starting_psn               = cmd.psn;
 823         param.peer_to_peer               = cmd.peer_to_peer;
 824         param.responder_resources        = cmd.responder_resources;
 825         param.initiator_depth            = cmd.initiator_depth;
 826         param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
 827         param.flow_control               = cmd.flow_control;
 828         param.local_cm_response_timeout  = cmd.local_cm_response_timeout;
 829         param.retry_count                = cmd.retry_count;
 830         param.rnr_retry_count            = cmd.rnr_retry_count;
 831         param.max_cm_retries             = cmd.max_cm_retries;
 832         param.srq                        = cmd.srq;
 833
 834         ctx = ib_ucm_ctx_get(cmd.id);
 835         if (!ctx) {
 836                 result = -ENOENT;
 837                 goto done;
 838         }
 839
 840         down(&ctx->file->mutex);
 841         if (ctx->file != file)
 842                 result = -EINVAL;
 843         else
 844                 result = ib_send_cm_req(ctx->cm_id, &param);
 845
 846         up(&ctx->file->mutex);
 847         ib_ucm_ctx_put(ctx); /* func reference */
 848 done:
 849         if (param.private_data)
 850                 kfree(param.private_data);
 851         if (param.primary_path)
 852                 kfree(param.primary_path);
 853         if (param.alternate_path)
 854                 kfree(param.alternate_path);
 855
 856         return result;
 857 }
 858
 859 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
 860                                const char __user *inbuf,
 861                                int in_len, int out_len)
 862 {
 863         struct ib_cm_rep_param param;
 864         struct ib_ucm_context *ctx;
 865         struct ib_ucm_rep cmd;
 866         int result;
 867
 868         param.private_data = NULL;
 869
 870         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 871                 return -EFAULT;
 872
 873         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
 874         if (result)
 875                 return result;
 876
 877         param.qp_num              = cmd.qpn;
 878         param.starting_psn        = cmd.psn;
 879         param.private_data_len    = cmd.len;
 880         param.responder_resources = cmd.responder_resources;
 881         param.initiator_depth     = cmd.initiator_depth;
 882         param.target_ack_delay    = cmd.target_ack_delay;
 883         param.failover_accepted   = cmd.failover_accepted;
 884         param.flow_control        = cmd.flow_control;
 885         param.rnr_retry_count     = cmd.rnr_retry_count;
 886         param.srq                 = cmd.srq;
 887
 888         ctx = ib_ucm_ctx_get(cmd.id);
 889         if (!ctx) {
 890                 result = -ENOENT;
 891                 goto done;
 892         }
 893
 894         down(&ctx->file->mutex);
 895         if (ctx->file != file)
 896                 result = -EINVAL;
 897         else
 898                 result = ib_send_cm_rep(ctx->cm_id, &param);
 899
 900         up(&ctx->file->mutex);
 901         ib_ucm_ctx_put(ctx); /* func reference */
 902 done:
 903         if (param.private_data)
 904                 kfree(param.private_data);
 905
 906         return result;
 907 }
 908
 909 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
 910                                         const char __user *inbuf, int in_len,
 911                                         int (*func)(struct ib_cm_id *cm_id,
 912                                                     const void *private_data,
 913                                                     u8 private_data_len))
 914 {
 915         struct ib_ucm_private_data cmd;
 916         struct ib_ucm_context *ctx;
 917         const void *private_data = NULL;
 918         int result;
 919
 920         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 921                 return -EFAULT;
 922
 923         result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
 924         if (result)
 925                 return result;
 926
 927         ctx = ib_ucm_ctx_get(cmd.id);
 928         if (!ctx) {
 929                 result = -ENOENT;
 930                 goto done;
 931         }
 932
 933         down(&ctx->file->mutex);
 934         if (ctx->file != file)
 935                 result = -EINVAL;
 936         else
 937                 result = func(ctx->cm_id, private_data, cmd.len);
 938
 939         up(&ctx->file->mutex);
 940         ib_ucm_ctx_put(ctx); /* func reference */
 941 done:
 942         if (private_data)
 943                 kfree(private_data);
 944
 945         return result;
 946 }
 947
 948 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
 949                                const char __user *inbuf,
 950                                int in_len, int out_len)
 951 {
 952         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
 953 }
 954
 955 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
 956                                 const char __user *inbuf,
 957                                 int in_len, int out_len)
 958 {
 959         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
 960 }
 961
 962 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
 963                                 const char __user *inbuf,
 964                                 int in_len, int out_len)
 965 {
 966         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
 967 }
 968
 969 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
 970                                 const char __user *inbuf, int in_len,
 971                                 int (*func)(struct ib_cm_id *cm_id,
 972                                             int status,
 973                                             const void *info,
 974                                             u8 info_len,
 975                                             const void *data,
 976                                             u8 data_len))
 977 {
 978         struct ib_ucm_context *ctx;
 979         struct ib_ucm_info cmd;
 980         const void *data = NULL;
 981         const void *info = NULL;
 982         int result;
 983
 984         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 985                 return -EFAULT;
 986
 987         result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
 988         if (result)
 989                 goto done;
 990
 991         result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
 992         if (result)
 993                 goto done;
 994
 995         ctx = ib_ucm_ctx_get(cmd.id);
 996         if (!ctx) {
 997                 result = -ENOENT;
 998                 goto done;
 999         }
1000
1001         down(&ctx->file->mutex);
1002         if (ctx->file != file)
1003                 result = -EINVAL;
1004         else
1005                 result = func(ctx->cm_id, cmd.status,
1006                               info, cmd.info_len,
1007                               data, cmd.data_len);
1008
1009         up(&ctx->file->mutex);
1010         ib_ucm_ctx_put(ctx); /* func reference */
1011 done:
1012         if (data)
1013                 kfree(data);
1014         if (info)
1015                 kfree(info);
1016
1017         return result;
1018 }
1019
1020 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
1021                                const char __user *inbuf,
1022                                int in_len, int out_len)
1023 {
1024         return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
1025 }
1026
1027 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
1028                                const char __user *inbuf,
1029                                int in_len, int out_len)
1030 {
1031         return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
1032 }
1033
1034 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
1035                                const char __user *inbuf,
1036                                int in_len, int out_len)
1037 {
1038         struct ib_ucm_context *ctx;
1039         struct ib_ucm_mra cmd;
1040         const void *data = NULL;
1041         int result;
1042
1043         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1044                 return -EFAULT;
1045
1046         result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
1047         if (result)
1048                 return result;
1049
1050         ctx = ib_ucm_ctx_get(cmd.id);
1051         if (!ctx) {
1052                 result = -ENOENT;
1053                 goto done;
1054         }
1055
1056         down(&ctx->file->mutex);
1057         if (ctx->file != file)
1058                 result = -EINVAL;
1059         else
1060                 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout,
1061                                         data, cmd.len);
1062
1063         up(&ctx->file->mutex);
1064         ib_ucm_ctx_put(ctx); /* func reference */
1065 done:
1066         if (data)
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         if (data)
1109                 kfree(data);
1110         if (path)
1111                 kfree(path);
1112
1113         return result;
1114 }
1115
1116 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1117                                     const char __user *inbuf,
1118                                     int in_len, int out_len)
1119 {
1120         struct ib_cm_sidr_req_param param;
1121         struct ib_ucm_context *ctx;
1122         struct ib_ucm_sidr_req cmd;
1123         int result;
1124
1125         param.private_data = NULL;
1126         param.path = NULL;
1127
1128         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1129                 return -EFAULT;
1130
1131         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
1132         if (result)
1133                 goto done;
1134
1135         result = ib_ucm_path_get(&param.path, cmd.path);
1136         if (result)
1137                 goto done;
1138
1139         param.private_data_len = cmd.len;
1140         param.service_id       = cmd.sid;
1141         param.timeout_ms       = cmd.timeout;
1142         param.max_cm_retries   = cmd.max_cm_retries;
1143         param.pkey             = cmd.pkey;
1144
1145         ctx = ib_ucm_ctx_get(cmd.id);
1146         if (!ctx) {
1147                 result = -ENOENT;
1148                 goto done;
1149         }
1150
1151         down(&ctx->file->mutex);
1152         if (ctx->file != file)
1153                 result = -EINVAL;
1154         else
1155                 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1156
1157         up(&ctx->file->mutex);
1158         ib_ucm_ctx_put(ctx); /* func reference */
1159 done:
1160         if (param.private_data)
1161                 kfree(param.private_data);
1162         if (param.path)
1163                 kfree(param.path);
1164
1165         return result;
1166 }
1167
1168 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1169                                     const char __user *inbuf,
1170                                     int in_len, int out_len)
1171 {
1172         struct ib_cm_sidr_rep_param param;
1173         struct ib_ucm_sidr_rep cmd;
1174         struct ib_ucm_context *ctx;
1175         int result;
1176
1177         param.info = NULL;
1178
1179         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1180                 return -EFAULT;
1181
1182         result = ib_ucm_alloc_data(&param.private_data,
1183                                    cmd.data, cmd.data_len);
1184         if (result)
1185                 goto done;
1186
1187         result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1188         if (result)
1189                 goto done;
1190
1191         param.qp_num       = cmd.qpn;
1192         param.qkey           = cmd.qkey;
1193         param.status       = cmd.status;
1194         param.info_length      = cmd.info_len;
1195         param.private_data_len = cmd.data_len;
1196
1197         ctx = ib_ucm_ctx_get(cmd.id);
1198         if (!ctx) {
1199                 result = -ENOENT;
1200                 goto done;
1201         }
1202
1203         down(&ctx->file->mutex);
1204         if (ctx->file != file)
1205                 result = -EINVAL;
1206         else
1207                 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1208
1209         up(&ctx->file->mutex);
1210         ib_ucm_ctx_put(ctx); /* func reference */
1211 done:
1212         if (param.private_data)
1213                 kfree(param.private_data);
1214         if (param.info)
1215                 kfree(param.info);
1216
1217         return result;
1218 }
1219
1220 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1221                                   const char __user *inbuf,
1222                                   int in_len, int out_len) = {
1223         [IB_USER_CM_CMD_CREATE_ID]     = ib_ucm_create_id,
1224         [IB_USER_CM_CMD_DESTROY_ID]    = ib_ucm_destroy_id,
1225         [IB_USER_CM_CMD_ATTR_ID]       = ib_ucm_attr_id,
1226         [IB_USER_CM_CMD_LISTEN]        = ib_ucm_listen,
1227         [IB_USER_CM_CMD_ESTABLISH]     = ib_ucm_establish,
1228         [IB_USER_CM_CMD_SEND_REQ]      = ib_ucm_send_req,
1229         [IB_USER_CM_CMD_SEND_REP]      = ib_ucm_send_rep,
1230         [IB_USER_CM_CMD_SEND_RTU]      = ib_ucm_send_rtu,
1231         [IB_USER_CM_CMD_SEND_DREQ]     = ib_ucm_send_dreq,
1232         [IB_USER_CM_CMD_SEND_DREP]     = ib_ucm_send_drep,
1233         [IB_USER_CM_CMD_SEND_REJ]      = ib_ucm_send_rej,
1234         [IB_USER_CM_CMD_SEND_MRA]      = ib_ucm_send_mra,
1235         [IB_USER_CM_CMD_SEND_LAP]      = ib_ucm_send_lap,
1236         [IB_USER_CM_CMD_SEND_APR]      = ib_ucm_send_apr,
1237         [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1238         [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1239         [IB_USER_CM_CMD_EVENT]         = ib_ucm_event,
1240 };
1241
1242 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1243                             size_t len, loff_t *pos)
1244 {
1245         struct ib_ucm_file *file = filp->private_data;
1246         struct ib_ucm_cmd_hdr hdr;
1247         ssize_t result;
1248
1249         if (len < sizeof(hdr))
1250                 return -EINVAL;
1251
1252         if (copy_from_user(&hdr, buf, sizeof(hdr)))
1253                 return -EFAULT;
1254
1255         printk(KERN_ERR "UCM: Write. cmd <%d> in <%d> out <%d> len <%Zu>\n",
1256                hdr.cmd, hdr.in, hdr.out, len);
1257
1258         if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1259                 return -EINVAL;
1260
1261         if (hdr.in + sizeof(hdr) > len)
1262                 return -EINVAL;
1263
1264         result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1265                                         hdr.in, hdr.out);
1266         if (!result)
1267                 result = len;
1268
1269         return result;
1270 }
1271
1272 static unsigned int ib_ucm_poll(struct file *filp,
1273                                 struct poll_table_struct *wait)
1274 {
1275         struct ib_ucm_file *file = filp->private_data;
1276         unsigned int mask = 0;
1277
1278         poll_wait(filp, &file->poll_wait, wait);
1279
1280         if (!list_empty(&file->events))
1281                 mask = POLLIN | POLLRDNORM;
1282
1283         return mask;
1284 }
1285
1286 static int ib_ucm_open(struct inode *inode, struct file *filp)
1287 {
1288         struct ib_ucm_file *file;
1289
1290         file = kmalloc(sizeof(*file), GFP_KERNEL);
1291         if (!file)
1292                 return -ENOMEM;
1293
1294         INIT_LIST_HEAD(&file->events);
1295         INIT_LIST_HEAD(&file->ctxs);
1296         init_waitqueue_head(&file->poll_wait);
1297
1298         init_MUTEX(&file->mutex);
1299
1300         filp->private_data = file;
1301         file->filp = filp;
1302
1303         printk(KERN_ERR "UCM: Created struct\n");
1304
1305         return 0;
1306 }
1307
1308 static int ib_ucm_close(struct inode *inode, struct file *filp)
1309 {
1310         struct ib_ucm_file *file = filp->private_data;
1311         struct ib_ucm_context *ctx;
1312
1313         down(&file->mutex);
1314
1315         while (!list_empty(&file->ctxs)) {
1316
1317                 ctx = list_entry(file->ctxs.next,
1318                                  struct ib_ucm_context, file_list);
1319
1320                 up(&ctx->file->mutex);
1321                 ib_ucm_ctx_put(ctx); /* user reference */
1322                 down(&file->mutex);
1323         }
1324
1325         up(&file->mutex);
1326
1327         kfree(file);
1328
1329         printk(KERN_ERR "UCM: Deleted struct\n");
1330         return 0;
1331 }
1332
1333 static struct file_operations ib_ucm_fops = {
1334         .owner   = THIS_MODULE,
1335         .open    = ib_ucm_open,
1336         .release = ib_ucm_close,
1337         .write   = ib_ucm_write,
1338         .poll    = ib_ucm_poll,
1339 };
1340
1341
1342 static struct class *ib_ucm_class;
1343 static struct cdev        ib_ucm_cdev;
1344
1345 static int __init ib_ucm_init(void)
1346 {
1347         int result;
1348
1349         result = register_chrdev_region(IB_UCM_DEV, 1, "infiniband_cm");
1350         if (result) {
1351                 printk(KERN_ERR "UCM: Error <%d> registering dev\n", result);
1352                 goto err_chr;
1353         }
1354
1355         cdev_init(&ib_ucm_cdev, &ib_ucm_fops);
1356
1357         result = cdev_add(&ib_ucm_cdev, IB_UCM_DEV, 1);
1358         if (result) {
1359                 printk(KERN_ERR "UCM: Error <%d> adding cdev\n", result);
1360                 goto err_cdev;
1361         }
1362
1363         ib_ucm_class = class_create(THIS_MODULE, "infiniband_cm");
1364         if (IS_ERR(ib_ucm_class)) {
1365                 result = PTR_ERR(ib_ucm_class);
1366                 printk(KERN_ERR "UCM: Error <%d> creating class\n", result);
1367                 goto err_class;
1368         }
1369
1370         class_device_create(ib_ucm_class, IB_UCM_DEV, NULL, "ucm");
1371
1372         idr_init(&ctx_id_table);
1373         init_MUTEX(&ctx_id_mutex);
1374
1375         return 0;
1376 err_class:
1377         cdev_del(&ib_ucm_cdev);
1378 err_cdev:
1379         unregister_chrdev_region(IB_UCM_DEV, 1);
1380 err_chr:
1381         return result;
1382 }
1383
1384 static void __exit ib_ucm_cleanup(void)
1385 {
1386         class_device_destroy(ib_ucm_class, IB_UCM_DEV);
1387         class_destroy(ib_ucm_class);
1388         cdev_del(&ib_ucm_cdev);
1389         unregister_chrdev_region(IB_UCM_DEV, 1);
1390 }
1391
1392 module_init(ib_ucm_init);
1393 module_exit(ib_ucm_cleanup);