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

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Intel Corporation.  All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *      copyright notice, this list of conditions and the following
  17  *      disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *      copyright notice, this list of conditions and the following
  21  *      disclaimer in the documentation and/or other materials
  22  *      provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  *
  33  * $Id: ucm.c 2594 2005-06-13 19:46:02Z libor $
  34  */
  35 #include <linux/init.h>
  36 #include <linux/fs.h>
  37 #include <linux/module.h>
  38 #include <linux/device.h>
  39 #include <linux/err.h>
  40 #include <linux/poll.h>
  41 #include <linux/file.h>
  42 #include <linux/mount.h>
  43 #include <linux/cdev.h>
  44
  45 #include <asm/uaccess.h>
  46
  47 #include "ucm.h"
  48
  49 MODULE_AUTHOR("Libor Michalek");
  50 MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
  51 MODULE_LICENSE("Dual BSD/GPL");
  52
  53 static int ucm_debug_level;
  54
  55 module_param_named(debug_level, ucm_debug_level, int, 0644);
  56 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  57
  58 enum {
  59         IB_UCM_MAJOR = 231,
  60         IB_UCM_MINOR = 255
  61 };
  62
  63 #define IB_UCM_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_MINOR)
  64
  65 #define PFX "UCM: "
  66
  67 #define ucm_dbg(format, arg...)                 \
  68         do {                                    \
  69                 if (ucm_debug_level > 0)        \
  70                         printk(KERN_DEBUG PFX format, ## arg); \
  71         } while (0)
  72
  73 static struct semaphore ctx_id_mutex;
  74 static struct idr       ctx_id_table;
  75
  76 static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, 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 = ERR_PTR(-ENOENT);
  84         else if (ctx->file != file)
  85                 ctx = ERR_PTR(-EINVAL);
  86         else
  87                 atomic_inc(&ctx->ref);
  88         up(&ctx_id_mutex);
  89
  90         return ctx;
  91 }
  92
  93 static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
  94 {
  95         if (atomic_dec_and_test(&ctx->ref))
  96                 wake_up(&ctx->wait);
  97 }
  98
  99 static inline int ib_ucm_new_cm_id(int event)
 100 {
 101         return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
 102 }
 103
 104 static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
 105 {
 106         struct ib_ucm_event *uevent;
 107
 108         down(&ctx->file->mutex);
 109         list_del(&ctx->file_list);
 110         while (!list_empty(&ctx->events)) {
 111
 112                 uevent = list_entry(ctx->events.next,
 113                                     struct ib_ucm_event, ctx_list);
 114                 list_del(&uevent->file_list);
 115                 list_del(&uevent->ctx_list);
 116
 117                 /* clear incoming connections. */
 118                 if (ib_ucm_new_cm_id(uevent->resp.event))
 119                         ib_destroy_cm_id(uevent->cm_id);
 120
 121                 kfree(uevent);
 122         }
 123         up(&ctx->file->mutex);
 124 }
 125
 126 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
 127 {
 128         struct ib_ucm_context *ctx;
 129         int result;
 130
 131         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
 132         if (!ctx)
 133                 return NULL;
 134
 135         memset(ctx, 0, sizeof *ctx);
 136         atomic_set(&ctx->ref, 1);
 137         init_waitqueue_head(&ctx->wait);
 138         ctx->file = file;
 139         INIT_LIST_HEAD(&ctx->events);
 140
 141         do {
 142                 result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
 143                 if (!result)
 144                         goto error;
 145
 146                 down(&ctx_id_mutex);
 147                 result = idr_get_new(&ctx_id_table, ctx, &ctx->id);
 148                 up(&ctx_id_mutex);
 149         } while (result == -EAGAIN);
 150
 151         if (result)
 152                 goto error;
 153
 154         list_add_tail(&ctx->file_list, &file->ctxs);
 155         ucm_dbg("Allocated CM ID <%d>\n", ctx->id);
 156         return ctx;
 157
 158 error:
 159         kfree(ctx);
 160         return NULL;
 161 }
 162 /*
 163  * Event portion of the API, handle CM events
 164  * and allow event polling.
 165  */
 166 static void ib_ucm_event_path_get(struct ib_ucm_path_rec *upath,
 167                                   struct ib_sa_path_rec  *kpath)
 168 {
 169         if (!kpath || !upath)
 170                 return;
 171
 172         memcpy(upath->dgid, kpath->dgid.raw, sizeof *upath->dgid);
 173         memcpy(upath->sgid, kpath->sgid.raw, sizeof *upath->sgid);
 174
 175         upath->dlid             = kpath->dlid;
 176         upath->slid             = kpath->slid;
 177         upath->raw_traffic      = kpath->raw_traffic;
 178         upath->flow_label       = kpath->flow_label;
 179         upath->hop_limit        = kpath->hop_limit;
 180         upath->traffic_class    = kpath->traffic_class;
 181         upath->reversible       = kpath->reversible;
 182         upath->numb_path        = kpath->numb_path;
 183         upath->pkey             = kpath->pkey;
 184         upath->sl               = kpath->sl;
 185         upath->mtu_selector     = kpath->mtu_selector;
 186         upath->mtu              = kpath->mtu;
 187         upath->rate_selector    = kpath->rate_selector;
 188         upath->rate             = kpath->rate;
 189         upath->packet_life_time = kpath->packet_life_time;
 190         upath->preference       = kpath->preference;
 191
 192         upath->packet_life_time_selector =
 193                 kpath->packet_life_time_selector;
 194 }
 195
 196 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
 197                                  struct ib_cm_req_event_param *kreq)
 198 {
 199         ureq->remote_ca_guid             = kreq->remote_ca_guid;
 200         ureq->remote_qkey                = kreq->remote_qkey;
 201         ureq->remote_qpn                 = kreq->remote_qpn;
 202         ureq->qp_type                    = kreq->qp_type;
 203         ureq->starting_psn               = kreq->starting_psn;
 204         ureq->responder_resources        = kreq->responder_resources;
 205         ureq->initiator_depth            = kreq->initiator_depth;
 206         ureq->local_cm_response_timeout  = kreq->local_cm_response_timeout;
 207         ureq->flow_control               = kreq->flow_control;
 208         ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
 209         ureq->retry_count                = kreq->retry_count;
 210         ureq->rnr_retry_count            = kreq->rnr_retry_count;
 211         ureq->srq                        = kreq->srq;
 212
 213         ib_ucm_event_path_get(&ureq->primary_path, kreq->primary_path);
 214         ib_ucm_event_path_get(&ureq->alternate_path, kreq->alternate_path);
 215 }
 216
 217 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
 218                                  struct ib_cm_rep_event_param *krep)
 219 {
 220         urep->remote_ca_guid      = krep->remote_ca_guid;
 221         urep->remote_qkey         = krep->remote_qkey;
 222         urep->remote_qpn          = krep->remote_qpn;
 223         urep->starting_psn        = krep->starting_psn;
 224         urep->responder_resources = krep->responder_resources;
 225         urep->initiator_depth     = krep->initiator_depth;
 226         urep->target_ack_delay    = krep->target_ack_delay;
 227         urep->failover_accepted   = krep->failover_accepted;
 228         urep->flow_control        = krep->flow_control;
 229         urep->rnr_retry_count     = krep->rnr_retry_count;
 230         urep->srq                 = krep->srq;
 231 }
 232
 233 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
 234                                       struct ib_cm_sidr_rep_event_param *krep)
 235 {
 236         urep->status = krep->status;
 237         urep->qkey   = krep->qkey;
 238         urep->qpn    = krep->qpn;
 239 };
 240
 241 static int ib_ucm_event_process(struct ib_cm_event *evt,
 242                                 struct ib_ucm_event *uvt)
 243 {
 244         void *info = NULL;
 245
 246         switch (evt->event) {
 247         case IB_CM_REQ_RECEIVED:
 248                 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
 249                                      &evt->param.req_rcvd);
 250                 uvt->data_len      = IB_CM_REQ_PRIVATE_DATA_SIZE;
 251                 uvt->resp.present  = IB_UCM_PRES_PRIMARY;
 252                 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
 253                                       IB_UCM_PRES_ALTERNATE : 0);
 254                 break;
 255         case IB_CM_REP_RECEIVED:
 256                 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
 257                                      &evt->param.rep_rcvd);
 258                 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
 259                 break;
 260         case IB_CM_RTU_RECEIVED:
 261                 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
 262                 uvt->resp.u.send_status = evt->param.send_status;
 263                 break;
 264         case IB_CM_DREQ_RECEIVED:
 265                 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
 266                 uvt->resp.u.send_status = evt->param.send_status;
 267                 break;
 268         case IB_CM_DREP_RECEIVED:
 269                 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
 270                 uvt->resp.u.send_status = evt->param.send_status;
 271                 break;
 272         case IB_CM_MRA_RECEIVED:
 273                 uvt->resp.u.mra_resp.timeout =
 274                                         evt->param.mra_rcvd.service_timeout;
 275                 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
 276                 break;
 277         case IB_CM_REJ_RECEIVED:
 278                 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
 279                 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
 280                 uvt->info_len = evt->param.rej_rcvd.ari_length;
 281                 info          = evt->param.rej_rcvd.ari;
 282                 break;
 283         case IB_CM_LAP_RECEIVED:
 284                 ib_ucm_event_path_get(&uvt->resp.u.lap_resp.path,
 285                                       evt->param.lap_rcvd.alternate_path);
 286                 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
 287                 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
 288                 break;
 289         case IB_CM_APR_RECEIVED:
 290                 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
 291                 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
 292                 uvt->info_len = evt->param.apr_rcvd.info_len;
 293                 info          = evt->param.apr_rcvd.apr_info;
 294                 break;
 295         case IB_CM_SIDR_REQ_RECEIVED:
 296                 uvt->resp.u.sidr_req_resp.pkey =
 297                                         evt->param.sidr_req_rcvd.pkey;
 298                 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
 299                 break;
 300         case IB_CM_SIDR_REP_RECEIVED:
 301                 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
 302                                           &evt->param.sidr_rep_rcvd);
 303                 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
 304                 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
 305                 info          = evt->param.sidr_rep_rcvd.info;
 306                 break;
 307         default:
 308                 uvt->resp.u.send_status = evt->param.send_status;
 309                 break;
 310         }
 311
 312         if (uvt->data_len) {
 313                 uvt->data = kmalloc(uvt->data_len, GFP_KERNEL);
 314                 if (!uvt->data)
 315                         goto err1;
 316
 317                 memcpy(uvt->data, evt->private_data, uvt->data_len);
 318                 uvt->resp.present |= IB_UCM_PRES_DATA;
 319         }
 320
 321         if (uvt->info_len) {
 322                 uvt->info = kmalloc(uvt->info_len, GFP_KERNEL);
 323                 if (!uvt->info)
 324                         goto err2;
 325
 326                 memcpy(uvt->info, info, uvt->info_len);
 327                 uvt->resp.present |= IB_UCM_PRES_INFO;
 328         }
 329         return 0;
 330
 331 err2:
 332         kfree(uvt->data);
 333 err1:
 334         return -ENOMEM;
 335 }
 336
 337 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
 338                                 struct ib_cm_event *event)
 339 {
 340         struct ib_ucm_event *uevent;
 341         struct ib_ucm_context *ctx;
 342         int result = 0;
 343
 344         ctx = cm_id->context;
 345
 346         uevent = kmalloc(sizeof(*uevent), GFP_KERNEL);
 347         if (!uevent)
 348                 goto err1;
 349
 350         memset(uevent, 0, sizeof(*uevent));
 351         uevent->ctx = ctx;
 352         uevent->cm_id = cm_id;
 353         uevent->resp.uid = ctx->uid;
 354         uevent->resp.id = ctx->id;
 355         uevent->resp.event = event->event;
 356
 357         result = ib_ucm_event_process(event, uevent);
 358         if (result)
 359                 goto err2;
 360
 361         down(&ctx->file->mutex);
 362         list_add_tail(&uevent->file_list, &ctx->file->events);
 363         list_add_tail(&uevent->ctx_list, &ctx->events);
 364         wake_up_interruptible(&ctx->file->poll_wait);
 365         up(&ctx->file->mutex);
 366         return 0;
 367
 368 err2:
 369         kfree(uevent);
 370 err1:
 371         /* Destroy new cm_id's */
 372         return ib_ucm_new_cm_id(event->event);
 373 }
 374
 375 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
 376                             const char __user *inbuf,
 377                             int in_len, int out_len)
 378 {
 379         struct ib_ucm_context *ctx;
 380         struct ib_ucm_event_get cmd;
 381         struct ib_ucm_event *uevent;
 382         int result = 0;
 383         DEFINE_WAIT(wait);
 384
 385         if (out_len < sizeof(struct ib_ucm_event_resp))
 386                 return -ENOSPC;
 387
 388         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 389                 return -EFAULT;
 390         /*
 391          * wait
 392          */
 393         down(&file->mutex);
 394         while (list_empty(&file->events)) {
 395
 396                 if (file->filp->f_flags & O_NONBLOCK) {
 397                         result = -EAGAIN;
 398                         break;
 399                 }
 400
 401                 if (signal_pending(current)) {
 402                         result = -ERESTARTSYS;
 403                         break;
 404                 }
 405
 406                 prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE);
 407
 408                 up(&file->mutex);
 409                 schedule();
 410                 down(&file->mutex);
 411
 412                 finish_wait(&file->poll_wait, &wait);
 413         }
 414
 415         if (result)
 416                 goto done;
 417
 418         uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
 419
 420         if (ib_ucm_new_cm_id(uevent->resp.event)) {
 421                 ctx = ib_ucm_ctx_alloc(file);
 422                 if (!ctx) {
 423                         result = -ENOMEM;
 424                         goto done;
 425                 }
 426
 427                 ctx->cm_id = uevent->cm_id;
 428                 ctx->cm_id->context = ctx;
 429                 uevent->resp.id = ctx->id;
 430         }
 431
 432         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 433                          &uevent->resp, sizeof(uevent->resp))) {
 434                 result = -EFAULT;
 435                 goto done;
 436         }
 437
 438         if (uevent->data) {
 439                 if (cmd.data_len < uevent->data_len) {
 440                         result = -ENOMEM;
 441                         goto done;
 442                 }
 443                 if (copy_to_user((void __user *)(unsigned long)cmd.data,
 444                                  uevent->data, uevent->data_len)) {
 445                         result = -EFAULT;
 446                         goto done;
 447                 }
 448         }
 449
 450         if (uevent->info) {
 451                 if (cmd.info_len < uevent->info_len) {
 452                         result = -ENOMEM;
 453                         goto done;
 454                 }
 455                 if (copy_to_user((void __user *)(unsigned long)cmd.info,
 456                                  uevent->info, uevent->info_len)) {
 457                         result = -EFAULT;
 458                         goto done;
 459                 }
 460         }
 461
 462         list_del(&uevent->file_list);
 463         list_del(&uevent->ctx_list);
 464         uevent->ctx->events_reported++;
 465
 466         kfree(uevent->data);
 467         kfree(uevent->info);
 468         kfree(uevent);
 469 done:
 470         up(&file->mutex);
 471         return result;
 472 }
 473
 474
 475 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
 476                                 const char __user *inbuf,
 477                                 int in_len, int out_len)
 478 {
 479         struct ib_ucm_create_id cmd;
 480         struct ib_ucm_create_id_resp resp;
 481         struct ib_ucm_context *ctx;
 482         int result;
 483
 484         if (out_len < sizeof(resp))
 485                 return -ENOSPC;
 486
 487         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 488                 return -EFAULT;
 489
 490         down(&file->mutex);
 491         ctx = ib_ucm_ctx_alloc(file);
 492         up(&file->mutex);
 493         if (!ctx)
 494                 return -ENOMEM;
 495
 496         ctx->uid = cmd.uid;
 497         ctx->cm_id = ib_create_cm_id(ib_ucm_event_handler, ctx);
 498         if (IS_ERR(ctx->cm_id)) {
 499                 result = PTR_ERR(ctx->cm_id);
 500                 goto err;
 501         }
 502
 503         resp.id = ctx->id;
 504         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 505                          &resp, sizeof(resp))) {
 506                 result = -EFAULT;
 507                 goto err;
 508         }
 509
 510         return 0;
 511
 512 err:
 513         down(&ctx_id_mutex);
 514         idr_remove(&ctx_id_table, ctx->id);
 515         up(&ctx_id_mutex);
 516
 517         if (!IS_ERR(ctx->cm_id))
 518                 ib_destroy_cm_id(ctx->cm_id);
 519
 520         kfree(ctx);
 521         return result;
 522 }
 523
 524 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
 525                                  const char __user *inbuf,
 526                                  int in_len, int out_len)
 527 {
 528         struct ib_ucm_destroy_id cmd;
 529         struct ib_ucm_destroy_id_resp resp;
 530         struct ib_ucm_context *ctx;
 531         int result = 0;
 532
 533         if (out_len < sizeof(resp))
 534                 return -ENOSPC;
 535
 536         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 537                 return -EFAULT;
 538
 539         down(&ctx_id_mutex);
 540         ctx = idr_find(&ctx_id_table, cmd.id);
 541         if (!ctx)
 542                 ctx = ERR_PTR(-ENOENT);
 543         else if (ctx->file != file)
 544                 ctx = ERR_PTR(-EINVAL);
 545         else
 546                 idr_remove(&ctx_id_table, ctx->id);
 547         up(&ctx_id_mutex);
 548
 549         if (IS_ERR(ctx))
 550                 return PTR_ERR(ctx);
 551
 552         atomic_dec(&ctx->ref);
 553         wait_event(ctx->wait, !atomic_read(&ctx->ref));
 554
 555         /* No new events will be generated after destroying the cm_id. */
 556         ib_destroy_cm_id(ctx->cm_id);
 557         /* Cleanup events not yet reported to the user. */
 558         ib_ucm_cleanup_events(ctx);
 559
 560         resp.events_reported = ctx->events_reported;
 561         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 562                          &resp, sizeof(resp)))
 563                 result = -EFAULT;
 564
 565         kfree(ctx);
 566         return result;
 567 }
 568
 569 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
 570                               const char __user *inbuf,
 571                               int in_len, int out_len)
 572 {
 573         struct ib_ucm_attr_id_resp resp;
 574         struct ib_ucm_attr_id cmd;
 575         struct ib_ucm_context *ctx;
 576         int result = 0;
 577
 578         if (out_len < sizeof(resp))
 579                 return -ENOSPC;
 580
 581         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 582                 return -EFAULT;
 583
 584         ctx = ib_ucm_ctx_get(file, cmd.id);
 585         if (IS_ERR(ctx))
 586                 return PTR_ERR(ctx);
 587
 588         resp.service_id   = ctx->cm_id->service_id;
 589         resp.service_mask = ctx->cm_id->service_mask;
 590         resp.local_id     = ctx->cm_id->local_id;
 591         resp.remote_id    = ctx->cm_id->remote_id;
 592
 593         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 594                          &resp, sizeof(resp)))
 595                 result = -EFAULT;
 596
 597         ib_ucm_ctx_put(ctx);
 598         return result;
 599 }
 600
 601 static void ib_ucm_copy_ah_attr(struct ib_ucm_ah_attr *dest_attr,
 602                                 struct ib_ah_attr *src_attr)
 603 {
 604         memcpy(dest_attr->grh_dgid, src_attr->grh.dgid.raw,
 605                sizeof src_attr->grh.dgid);
 606         dest_attr->grh_flow_label = src_attr->grh.flow_label;
 607         dest_attr->grh_sgid_index = src_attr->grh.sgid_index;
 608         dest_attr->grh_hop_limit = src_attr->grh.hop_limit;
 609         dest_attr->grh_traffic_class = src_attr->grh.traffic_class;
 610
 611         dest_attr->dlid = src_attr->dlid;
 612         dest_attr->sl = src_attr->sl;
 613         dest_attr->src_path_bits = src_attr->src_path_bits;
 614         dest_attr->static_rate = src_attr->static_rate;
 615         dest_attr->is_global = (src_attr->ah_flags & IB_AH_GRH);
 616         dest_attr->port_num = src_attr->port_num;
 617 }
 618
 619 static void ib_ucm_copy_qp_attr(struct ib_ucm_init_qp_attr_resp *dest_attr,
 620                                 struct ib_qp_attr *src_attr)
 621 {
 622         dest_attr->cur_qp_state = src_attr->cur_qp_state;
 623         dest_attr->path_mtu = src_attr->path_mtu;
 624         dest_attr->path_mig_state = src_attr->path_mig_state;
 625         dest_attr->qkey = src_attr->qkey;
 626         dest_attr->rq_psn = src_attr->rq_psn;
 627         dest_attr->sq_psn = src_attr->sq_psn;
 628         dest_attr->dest_qp_num = src_attr->dest_qp_num;
 629         dest_attr->qp_access_flags = src_attr->qp_access_flags;
 630
 631         dest_attr->max_send_wr = src_attr->cap.max_send_wr;
 632         dest_attr->max_recv_wr = src_attr->cap.max_recv_wr;
 633         dest_attr->max_send_sge = src_attr->cap.max_send_sge;
 634         dest_attr->max_recv_sge = src_attr->cap.max_recv_sge;
 635         dest_attr->max_inline_data = src_attr->cap.max_inline_data;
 636
 637         ib_ucm_copy_ah_attr(&dest_attr->ah_attr, &src_attr->ah_attr);
 638         ib_ucm_copy_ah_attr(&dest_attr->alt_ah_attr, &src_attr->alt_ah_attr);
 639
 640         dest_attr->pkey_index = src_attr->pkey_index;
 641         dest_attr->alt_pkey_index = src_attr->alt_pkey_index;
 642         dest_attr->en_sqd_async_notify = src_attr->en_sqd_async_notify;
 643         dest_attr->sq_draining = src_attr->sq_draining;
 644         dest_attr->max_rd_atomic = src_attr->max_rd_atomic;
 645         dest_attr->max_dest_rd_atomic = src_attr->max_dest_rd_atomic;
 646         dest_attr->min_rnr_timer = src_attr->min_rnr_timer;
 647         dest_attr->port_num = src_attr->port_num;
 648         dest_attr->timeout = src_attr->timeout;
 649         dest_attr->retry_cnt = src_attr->retry_cnt;
 650         dest_attr->rnr_retry = src_attr->rnr_retry;
 651         dest_attr->alt_port_num = src_attr->alt_port_num;
 652         dest_attr->alt_timeout = src_attr->alt_timeout;
 653 }
 654
 655 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
 656                                    const char __user *inbuf,
 657                                    int in_len, int out_len)
 658 {
 659         struct ib_ucm_init_qp_attr_resp resp;
 660         struct ib_ucm_init_qp_attr cmd;
 661         struct ib_ucm_context *ctx;
 662         struct ib_qp_attr qp_attr;
 663         int result = 0;
 664
 665         if (out_len < sizeof(resp))
 666                 return -ENOSPC;
 667
 668         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 669                 return -EFAULT;
 670
 671         ctx = ib_ucm_ctx_get(file, cmd.id);
 672         if (IS_ERR(ctx))
 673                 return PTR_ERR(ctx);
 674
 675         resp.qp_attr_mask = 0;
 676         memset(&qp_attr, 0, sizeof qp_attr);
 677         qp_attr.qp_state = cmd.qp_state;
 678         result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
 679         if (result)
 680                 goto out;
 681
 682         ib_ucm_copy_qp_attr(&resp, &qp_attr);
 683
 684         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 685                          &resp, sizeof(resp)))
 686                 result = -EFAULT;
 687
 688 out:
 689         ib_ucm_ctx_put(ctx);
 690         return result;
 691 }
 692
 693 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
 694                              const char __user *inbuf,
 695                              int in_len, int out_len)
 696 {
 697         struct ib_ucm_listen cmd;
 698         struct ib_ucm_context *ctx;
 699         int result;
 700
 701         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 702                 return -EFAULT;
 703
 704         ctx = ib_ucm_ctx_get(file, cmd.id);
 705         if (IS_ERR(ctx))
 706                 return PTR_ERR(ctx);
 707
 708         result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask);
 709         ib_ucm_ctx_put(ctx);
 710         return result;
 711 }
 712
 713 static ssize_t ib_ucm_establish(struct ib_ucm_file *file,
 714                                 const char __user *inbuf,
 715                                 int in_len, int out_len)
 716 {
 717         struct ib_ucm_establish cmd;
 718         struct ib_ucm_context *ctx;
 719         int result;
 720
 721         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 722                 return -EFAULT;
 723
 724         ctx = ib_ucm_ctx_get(file, cmd.id);
 725         if (IS_ERR(ctx))
 726                 return PTR_ERR(ctx);
 727
 728         result = ib_cm_establish(ctx->cm_id);
 729         ib_ucm_ctx_put(ctx);
 730         return result;
 731 }
 732
 733 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
 734 {
 735         void *data;
 736
 737         *dest = NULL;
 738
 739         if (!len)
 740                 return 0;
 741
 742         data = kmalloc(len, GFP_KERNEL);
 743         if (!data)
 744                 return -ENOMEM;
 745
 746         if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
 747                 kfree(data);
 748                 return -EFAULT;
 749         }
 750
 751         *dest = data;
 752         return 0;
 753 }
 754
 755 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
 756 {
 757         struct ib_ucm_path_rec ucm_path;
 758         struct ib_sa_path_rec  *sa_path;
 759
 760         *path = NULL;
 761
 762         if (!src)
 763                 return 0;
 764
 765         sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
 766         if (!sa_path)
 767                 return -ENOMEM;
 768
 769         if (copy_from_user(&ucm_path, (void __user *)(unsigned long)src,
 770                            sizeof(ucm_path))) {
 771
 772                 kfree(sa_path);
 773                 return -EFAULT;
 774         }
 775
 776         memcpy(sa_path->dgid.raw, ucm_path.dgid, sizeof sa_path->dgid);
 777         memcpy(sa_path->sgid.raw, ucm_path.sgid, sizeof sa_path->sgid);
 778
 779         sa_path->dlid             = ucm_path.dlid;
 780         sa_path->slid             = ucm_path.slid;
 781         sa_path->raw_traffic      = ucm_path.raw_traffic;
 782         sa_path->flow_label       = ucm_path.flow_label;
 783         sa_path->hop_limit        = ucm_path.hop_limit;
 784         sa_path->traffic_class    = ucm_path.traffic_class;
 785         sa_path->reversible       = ucm_path.reversible;
 786         sa_path->numb_path        = ucm_path.numb_path;
 787         sa_path->pkey             = ucm_path.pkey;
 788         sa_path->sl               = ucm_path.sl;
 789         sa_path->mtu_selector     = ucm_path.mtu_selector;
 790         sa_path->mtu              = ucm_path.mtu;
 791         sa_path->rate_selector    = ucm_path.rate_selector;
 792         sa_path->rate             = ucm_path.rate;
 793         sa_path->packet_life_time = ucm_path.packet_life_time;
 794         sa_path->preference       = ucm_path.preference;
 795
 796         sa_path->packet_life_time_selector =
 797                 ucm_path.packet_life_time_selector;
 798
 799         *path = sa_path;
 800         return 0;
 801 }
 802
 803 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
 804                                const char __user *inbuf,
 805                                int in_len, int out_len)
 806 {
 807         struct ib_cm_req_param param;
 808         struct ib_ucm_context *ctx;
 809         struct ib_ucm_req cmd;
 810         int result;
 811
 812         param.private_data   = NULL;
 813         param.primary_path   = NULL;
 814         param.alternate_path = NULL;
 815
 816         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 817                 return -EFAULT;
 818
 819         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
 820         if (result)
 821                 goto done;
 822
 823         result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
 824         if (result)
 825                 goto done;
 826
 827         result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
 828         if (result)
 829                 goto done;
 830
 831         param.private_data_len           = cmd.len;
 832         param.service_id                 = cmd.sid;
 833         param.qp_num                     = cmd.qpn;
 834         param.qp_type                    = cmd.qp_type;
 835         param.starting_psn               = cmd.psn;
 836         param.peer_to_peer               = cmd.peer_to_peer;
 837         param.responder_resources        = cmd.responder_resources;
 838         param.initiator_depth            = cmd.initiator_depth;
 839         param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
 840         param.flow_control               = cmd.flow_control;
 841         param.local_cm_response_timeout  = cmd.local_cm_response_timeout;
 842         param.retry_count                = cmd.retry_count;
 843         param.rnr_retry_count            = cmd.rnr_retry_count;
 844         param.max_cm_retries             = cmd.max_cm_retries;
 845         param.srq                        = cmd.srq;
 846
 847         ctx = ib_ucm_ctx_get(file, cmd.id);
 848         if (!IS_ERR(ctx)) {
 849                 result = ib_send_cm_req(ctx->cm_id, &param);
 850                 ib_ucm_ctx_put(ctx);
 851         } else
 852                 result = PTR_ERR(ctx);
 853
 854 done:
 855         kfree(param.private_data);
 856         kfree(param.primary_path);
 857         kfree(param.alternate_path);
 858         return result;
 859 }
 860
 861 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
 862                                const char __user *inbuf,
 863                                int in_len, int out_len)
 864 {
 865         struct ib_cm_rep_param param;
 866         struct ib_ucm_context *ctx;
 867         struct ib_ucm_rep cmd;
 868         int result;
 869
 870         param.private_data = NULL;
 871
 872         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 873                 return -EFAULT;
 874
 875         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
 876         if (result)
 877                 return result;
 878
 879         param.qp_num              = cmd.qpn;
 880         param.starting_psn        = cmd.psn;
 881         param.private_data_len    = cmd.len;
 882         param.responder_resources = cmd.responder_resources;
 883         param.initiator_depth     = cmd.initiator_depth;
 884         param.target_ack_delay    = cmd.target_ack_delay;
 885         param.failover_accepted   = cmd.failover_accepted;
 886         param.flow_control        = cmd.flow_control;
 887         param.rnr_retry_count     = cmd.rnr_retry_count;
 888         param.srq                 = cmd.srq;
 889
 890         ctx = ib_ucm_ctx_get(file, cmd.id);
 891         if (!IS_ERR(ctx)) {
 892                 ctx->uid = cmd.uid;
 893                 result = ib_send_cm_rep(ctx->cm_id, &param);
 894                 ib_ucm_ctx_put(ctx);
 895         } else
 896                 result = PTR_ERR(ctx);
 897
 898         kfree(param.private_data);
 899         return result;
 900 }
 901
 902 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
 903                                         const char __user *inbuf, int in_len,
 904                                         int (*func)(struct ib_cm_id *cm_id,
 905                                                     const void *private_data,
 906                                                     u8 private_data_len))
 907 {
 908         struct ib_ucm_private_data cmd;
 909         struct ib_ucm_context *ctx;
 910         const void *private_data = NULL;
 911         int result;
 912
 913         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 914                 return -EFAULT;
 915
 916         result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
 917         if (result)
 918                 return result;
 919
 920         ctx = ib_ucm_ctx_get(file, cmd.id);
 921         if (!IS_ERR(ctx)) {
 922                 result = func(ctx->cm_id, private_data, cmd.len);
 923                 ib_ucm_ctx_put(ctx);
 924         } else
 925                 result = PTR_ERR(ctx);
 926
 927         kfree(private_data);
 928         return result;
 929 }
 930
 931 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
 932                                const char __user *inbuf,
 933                                int in_len, int out_len)
 934 {
 935         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
 936 }
 937
 938 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
 939                                 const char __user *inbuf,
 940                                 int in_len, int out_len)
 941 {
 942         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
 943 }
 944
 945 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
 946                                 const char __user *inbuf,
 947                                 int in_len, int out_len)
 948 {
 949         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
 950 }
 951
 952 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
 953                                 const char __user *inbuf, int in_len,
 954                                 int (*func)(struct ib_cm_id *cm_id,
 955                                             int status,
 956                                             const void *info,
 957                                             u8 info_len,
 958                                             const void *data,
 959                                             u8 data_len))
 960 {
 961         struct ib_ucm_context *ctx;
 962         struct ib_ucm_info cmd;
 963         const void *data = NULL;
 964         const void *info = NULL;
 965         int result;
 966
 967         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 968                 return -EFAULT;
 969
 970         result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
 971         if (result)
 972                 goto done;
 973
 974         result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
 975         if (result)
 976                 goto done;
 977
 978         ctx = ib_ucm_ctx_get(file, cmd.id);
 979         if (!IS_ERR(ctx)) {
 980                 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
 981                               data, cmd.data_len);
 982                 ib_ucm_ctx_put(ctx);
 983         } else
 984                 result = PTR_ERR(ctx);
 985
 986 done:
 987         kfree(data);
 988         kfree(info);
 989         return result;
 990 }
 991
 992 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
 993                                const char __user *inbuf,
 994                                int in_len, int out_len)
 995 {
 996         return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
 997 }
 998
 999 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
1000                                const char __user *inbuf,
1001                                int in_len, int out_len)
1002 {
1003         return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
1004 }
1005
1006 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
1007                                const char __user *inbuf,
1008                                int in_len, int out_len)
1009 {
1010         struct ib_ucm_context *ctx;
1011         struct ib_ucm_mra cmd;
1012         const void *data = NULL;
1013         int result;
1014
1015         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1016                 return -EFAULT;
1017
1018         result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
1019         if (result)
1020                 return result;
1021
1022         ctx = ib_ucm_ctx_get(file, cmd.id);
1023         if (!IS_ERR(ctx)) {
1024                 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
1025                 ib_ucm_ctx_put(ctx);
1026         } else
1027                 result = PTR_ERR(ctx);
1028
1029         kfree(data);
1030         return result;
1031 }
1032
1033 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
1034                                const char __user *inbuf,
1035                                int in_len, int out_len)
1036 {
1037         struct ib_ucm_context *ctx;
1038         struct ib_sa_path_rec *path = NULL;
1039         struct ib_ucm_lap 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                 goto done;
1049
1050         result = ib_ucm_path_get(&path, cmd.path);
1051         if (result)
1052                 goto done;
1053
1054         ctx = ib_ucm_ctx_get(file, cmd.id);
1055         if (!IS_ERR(ctx)) {
1056                 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
1057                 ib_ucm_ctx_put(ctx);
1058         } else
1059                 result = PTR_ERR(ctx);
1060
1061 done:
1062         kfree(data);
1063         kfree(path);
1064         return result;
1065 }
1066
1067 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1068                                     const char __user *inbuf,
1069                                     int in_len, int out_len)
1070 {
1071         struct ib_cm_sidr_req_param param;
1072         struct ib_ucm_context *ctx;
1073         struct ib_ucm_sidr_req cmd;
1074         int result;
1075
1076         param.private_data = NULL;
1077         param.path = NULL;
1078
1079         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1080                 return -EFAULT;
1081
1082         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
1083         if (result)
1084                 goto done;
1085
1086         result = ib_ucm_path_get(&param.path, cmd.path);
1087         if (result)
1088                 goto done;
1089
1090         param.private_data_len = cmd.len;
1091         param.service_id       = cmd.sid;
1092         param.timeout_ms       = cmd.timeout;
1093         param.max_cm_retries   = cmd.max_cm_retries;
1094         param.pkey             = cmd.pkey;
1095
1096         ctx = ib_ucm_ctx_get(file, cmd.id);
1097         if (!IS_ERR(ctx)) {
1098                 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1099                 ib_ucm_ctx_put(ctx);
1100         } else
1101                 result = PTR_ERR(ctx);
1102
1103 done:
1104         kfree(param.private_data);
1105         kfree(param.path);
1106         return result;
1107 }
1108
1109 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1110                                     const char __user *inbuf,
1111                                     int in_len, int out_len)
1112 {
1113         struct ib_cm_sidr_rep_param param;
1114         struct ib_ucm_sidr_rep cmd;
1115         struct ib_ucm_context *ctx;
1116         int result;
1117
1118         param.info = NULL;
1119
1120         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1121                 return -EFAULT;
1122
1123         result = ib_ucm_alloc_data(&param.private_data,
1124                                    cmd.data, cmd.data_len);
1125         if (result)
1126                 goto done;
1127
1128         result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1129         if (result)
1130                 goto done;
1131
1132         param.qp_num            = cmd.qpn;
1133         param.qkey              = cmd.qkey;
1134         param.status            = cmd.status;
1135         param.info_length       = cmd.info_len;
1136         param.private_data_len  = cmd.data_len;
1137
1138         ctx = ib_ucm_ctx_get(file, cmd.id);
1139         if (!IS_ERR(ctx)) {
1140                 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1141                 ib_ucm_ctx_put(ctx);
1142         } else
1143                 result = PTR_ERR(ctx);
1144
1145 done:
1146         kfree(param.private_data);
1147         kfree(param.info);
1148         return result;
1149 }
1150
1151 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1152                                   const char __user *inbuf,
1153                                   int in_len, int out_len) = {
1154         [IB_USER_CM_CMD_CREATE_ID]     = ib_ucm_create_id,
1155         [IB_USER_CM_CMD_DESTROY_ID]    = ib_ucm_destroy_id,
1156         [IB_USER_CM_CMD_ATTR_ID]       = ib_ucm_attr_id,
1157         [IB_USER_CM_CMD_LISTEN]        = ib_ucm_listen,
1158         [IB_USER_CM_CMD_ESTABLISH]     = ib_ucm_establish,
1159         [IB_USER_CM_CMD_SEND_REQ]      = ib_ucm_send_req,
1160         [IB_USER_CM_CMD_SEND_REP]      = ib_ucm_send_rep,
1161         [IB_USER_CM_CMD_SEND_RTU]      = ib_ucm_send_rtu,
1162         [IB_USER_CM_CMD_SEND_DREQ]     = ib_ucm_send_dreq,
1163         [IB_USER_CM_CMD_SEND_DREP]     = ib_ucm_send_drep,
1164         [IB_USER_CM_CMD_SEND_REJ]      = ib_ucm_send_rej,
1165         [IB_USER_CM_CMD_SEND_MRA]      = ib_ucm_send_mra,
1166         [IB_USER_CM_CMD_SEND_LAP]      = ib_ucm_send_lap,
1167         [IB_USER_CM_CMD_SEND_APR]      = ib_ucm_send_apr,
1168         [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1169         [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1170         [IB_USER_CM_CMD_EVENT]         = ib_ucm_event,
1171         [IB_USER_CM_CMD_INIT_QP_ATTR]  = ib_ucm_init_qp_attr,
1172 };
1173
1174 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1175                             size_t len, loff_t *pos)
1176 {
1177         struct ib_ucm_file *file = filp->private_data;
1178         struct ib_ucm_cmd_hdr hdr;
1179         ssize_t result;
1180
1181         if (len < sizeof(hdr))
1182                 return -EINVAL;
1183
1184         if (copy_from_user(&hdr, buf, sizeof(hdr)))
1185                 return -EFAULT;
1186
1187         ucm_dbg("Write. cmd <%d> in <%d> out <%d> len <%Zu>\n",
1188                 hdr.cmd, hdr.in, hdr.out, len);
1189
1190         if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1191                 return -EINVAL;
1192
1193         if (hdr.in + sizeof(hdr) > len)
1194                 return -EINVAL;
1195
1196         result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1197                                         hdr.in, hdr.out);
1198         if (!result)
1199                 result = len;
1200
1201         return result;
1202 }
1203
1204 static unsigned int ib_ucm_poll(struct file *filp,
1205                                 struct poll_table_struct *wait)
1206 {
1207         struct ib_ucm_file *file = filp->private_data;
1208         unsigned int mask = 0;
1209
1210         poll_wait(filp, &file->poll_wait, wait);
1211
1212         if (!list_empty(&file->events))
1213                 mask = POLLIN | POLLRDNORM;
1214
1215         return mask;
1216 }
1217
1218 static int ib_ucm_open(struct inode *inode, struct file *filp)
1219 {
1220         struct ib_ucm_file *file;
1221
1222         file = kmalloc(sizeof(*file), GFP_KERNEL);
1223         if (!file)
1224                 return -ENOMEM;
1225
1226         INIT_LIST_HEAD(&file->events);
1227         INIT_LIST_HEAD(&file->ctxs);
1228         init_waitqueue_head(&file->poll_wait);
1229
1230         init_MUTEX(&file->mutex);
1231
1232         filp->private_data = file;
1233         file->filp = filp;
1234
1235         ucm_dbg("Created struct\n");
1236
1237         return 0;
1238 }
1239
1240 static int ib_ucm_close(struct inode *inode, struct file *filp)
1241 {
1242         struct ib_ucm_file *file = filp->private_data;
1243         struct ib_ucm_context *ctx;
1244
1245         down(&file->mutex);
1246         while (!list_empty(&file->ctxs)) {
1247                 ctx = list_entry(file->ctxs.next,
1248                                  struct ib_ucm_context, file_list);
1249                 up(&file->mutex);
1250
1251                 down(&ctx_id_mutex);
1252                 idr_remove(&ctx_id_table, ctx->id);
1253                 up(&ctx_id_mutex);
1254
1255                 ib_destroy_cm_id(ctx->cm_id);
1256                 ib_ucm_cleanup_events(ctx);
1257                 kfree(ctx);
1258
1259                 down(&file->mutex);
1260         }
1261         up(&file->mutex);
1262         kfree(file);
1263         return 0;
1264 }
1265
1266 static struct file_operations ib_ucm_fops = {
1267         .owner   = THIS_MODULE,
1268         .open    = ib_ucm_open,
1269         .release = ib_ucm_close,
1270         .write   = ib_ucm_write,
1271         .poll    = ib_ucm_poll,
1272 };
1273
1274
1275 static struct class *ib_ucm_class;
1276 static struct cdev        ib_ucm_cdev;
1277
1278 static int __init ib_ucm_init(void)
1279 {
1280         int result;
1281
1282         result = register_chrdev_region(IB_UCM_DEV, 1, "infiniband_cm");
1283         if (result) {
1284                 ucm_dbg("Error <%d> registering dev\n", result);
1285                 goto err_chr;
1286         }
1287
1288         cdev_init(&ib_ucm_cdev, &ib_ucm_fops);
1289
1290         result = cdev_add(&ib_ucm_cdev, IB_UCM_DEV, 1);
1291         if (result) {
1292                 ucm_dbg("Error <%d> adding cdev\n", result);
1293                 goto err_cdev;
1294         }
1295
1296         ib_ucm_class = class_create(THIS_MODULE, "infiniband_cm");
1297         if (IS_ERR(ib_ucm_class)) {
1298                 result = PTR_ERR(ib_ucm_class);
1299                 ucm_dbg("Error <%d> creating class\n", result);
1300                 goto err_class;
1301         }
1302
1303         class_device_create(ib_ucm_class, IB_UCM_DEV, NULL, "ucm");
1304
1305         idr_init(&ctx_id_table);
1306         init_MUTEX(&ctx_id_mutex);
1307
1308         return 0;
1309 err_class:
1310         cdev_del(&ib_ucm_cdev);
1311 err_cdev:
1312         unregister_chrdev_region(IB_UCM_DEV, 1);
1313 err_chr:
1314         return result;
1315 }
1316
1317 static void __exit ib_ucm_cleanup(void)
1318 {
1319         class_device_destroy(ib_ucm_class, IB_UCM_DEV);
1320         class_destroy(ib_ucm_class);
1321         cdev_del(&ib_ucm_cdev);
1322         unregister_chrdev_region(IB_UCM_DEV, 1);
1323 }
1324
1325 module_init(ib_ucm_init);
1326 module_exit(ib_ucm_cleanup);