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 #include <linux/idr.h>
  45
  46 #include <asm/uaccess.h>
  47
  48 #include <rdma/ib_cm.h>
  49 #include <rdma/ib_user_cm.h>
  50
  51 MODULE_AUTHOR("Libor Michalek");
  52 MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
  53 MODULE_LICENSE("Dual BSD/GPL");
  54
  55 struct ib_ucm_device {
  56         int                     devnum;
  57         struct cdev             dev;
  58         struct class_device     class_dev;
  59         struct ib_device        *ib_dev;
  60 };
  61
  62 struct ib_ucm_file {
  63         struct semaphore mutex;
  64         struct file *filp;
  65         struct ib_ucm_device *device;
  66
  67         struct list_head  ctxs;
  68         struct list_head  events;
  69         wait_queue_head_t poll_wait;
  70 };
  71
  72 struct ib_ucm_context {
  73         int                 id;
  74         wait_queue_head_t   wait;
  75         atomic_t            ref;
  76         int                 events_reported;
  77
  78         struct ib_ucm_file *file;
  79         struct ib_cm_id    *cm_id;
  80         __u64              uid;
  81
  82         struct list_head    events;    /* list of pending events. */
  83         struct list_head    file_list; /* member in file ctx list */
  84 };
  85
  86 struct ib_ucm_event {
  87         struct ib_ucm_context *ctx;
  88         struct list_head file_list; /* member in file event list */
  89         struct list_head ctx_list;  /* member in ctx event list */
  90
  91         struct ib_cm_id *cm_id;
  92         struct ib_ucm_event_resp resp;
  93         void *data;
  94         void *info;
  95         int data_len;
  96         int info_len;
  97 };
  98
  99 enum {
 100         IB_UCM_MAJOR = 231,
 101         IB_UCM_BASE_MINOR = 224,
 102         IB_UCM_MAX_DEVICES = 32
 103 };
 104
 105 #define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
 106
 107 static void ib_ucm_add_one(struct ib_device *device);
 108 static void ib_ucm_remove_one(struct ib_device *device);
 109
 110 static struct ib_client ucm_client = {
 111         .name   = "ucm",
 112         .add    = ib_ucm_add_one,
 113         .remove = ib_ucm_remove_one
 114 };
 115
 116 static DECLARE_MUTEX(ctx_id_mutex);
 117 static DEFINE_IDR(ctx_id_table);
 118 static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);
 119
 120 static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
 121 {
 122         struct ib_ucm_context *ctx;
 123
 124         down(&ctx_id_mutex);
 125         ctx = idr_find(&ctx_id_table, id);
 126         if (!ctx)
 127                 ctx = ERR_PTR(-ENOENT);
 128         else if (ctx->file != file)
 129                 ctx = ERR_PTR(-EINVAL);
 130         else
 131                 atomic_inc(&ctx->ref);
 132         up(&ctx_id_mutex);
 133
 134         return ctx;
 135 }
 136
 137 static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
 138 {
 139         if (atomic_dec_and_test(&ctx->ref))
 140                 wake_up(&ctx->wait);
 141 }
 142
 143 static inline int ib_ucm_new_cm_id(int event)
 144 {
 145         return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
 146 }
 147
 148 static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
 149 {
 150         struct ib_ucm_event *uevent;
 151
 152         down(&ctx->file->mutex);
 153         list_del(&ctx->file_list);
 154         while (!list_empty(&ctx->events)) {
 155
 156                 uevent = list_entry(ctx->events.next,
 157                                     struct ib_ucm_event, ctx_list);
 158                 list_del(&uevent->file_list);
 159                 list_del(&uevent->ctx_list);
 160
 161                 /* clear incoming connections. */
 162                 if (ib_ucm_new_cm_id(uevent->resp.event))
 163                         ib_destroy_cm_id(uevent->cm_id);
 164
 165                 kfree(uevent);
 166         }
 167         up(&ctx->file->mutex);
 168 }
 169
 170 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
 171 {
 172         struct ib_ucm_context *ctx;
 173         int result;
 174
 175         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
 176         if (!ctx)
 177                 return NULL;
 178
 179         memset(ctx, 0, sizeof *ctx);
 180         atomic_set(&ctx->ref, 1);
 181         init_waitqueue_head(&ctx->wait);
 182         ctx->file = file;
 183         INIT_LIST_HEAD(&ctx->events);
 184
 185         do {
 186                 result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
 187                 if (!result)
 188                         goto error;
 189
 190                 down(&ctx_id_mutex);
 191                 result = idr_get_new(&ctx_id_table, ctx, &ctx->id);
 192                 up(&ctx_id_mutex);
 193         } while (result == -EAGAIN);
 194
 195         if (result)
 196                 goto error;
 197
 198         list_add_tail(&ctx->file_list, &file->ctxs);
 199         return ctx;
 200
 201 error:
 202         kfree(ctx);
 203         return NULL;
 204 }
 205
 206 static void ib_ucm_event_path_get(struct ib_ucm_path_rec *upath,
 207                                   struct ib_sa_path_rec  *kpath)
 208 {
 209         if (!kpath || !upath)
 210                 return;
 211
 212         memcpy(upath->dgid, kpath->dgid.raw, sizeof *upath->dgid);
 213         memcpy(upath->sgid, kpath->sgid.raw, sizeof *upath->sgid);
 214
 215         upath->dlid             = kpath->dlid;
 216         upath->slid             = kpath->slid;
 217         upath->raw_traffic      = kpath->raw_traffic;
 218         upath->flow_label       = kpath->flow_label;
 219         upath->hop_limit        = kpath->hop_limit;
 220         upath->traffic_class    = kpath->traffic_class;
 221         upath->reversible       = kpath->reversible;
 222         upath->numb_path        = kpath->numb_path;
 223         upath->pkey             = kpath->pkey;
 224         upath->sl               = kpath->sl;
 225         upath->mtu_selector     = kpath->mtu_selector;
 226         upath->mtu              = kpath->mtu;
 227         upath->rate_selector    = kpath->rate_selector;
 228         upath->rate             = kpath->rate;
 229         upath->packet_life_time = kpath->packet_life_time;
 230         upath->preference       = kpath->preference;
 231
 232         upath->packet_life_time_selector =
 233                 kpath->packet_life_time_selector;
 234 }
 235
 236 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
 237                                  struct ib_cm_req_event_param *kreq)
 238 {
 239         ureq->remote_ca_guid             = kreq->remote_ca_guid;
 240         ureq->remote_qkey                = kreq->remote_qkey;
 241         ureq->remote_qpn                 = kreq->remote_qpn;
 242         ureq->qp_type                    = kreq->qp_type;
 243         ureq->starting_psn               = kreq->starting_psn;
 244         ureq->responder_resources        = kreq->responder_resources;
 245         ureq->initiator_depth            = kreq->initiator_depth;
 246         ureq->local_cm_response_timeout  = kreq->local_cm_response_timeout;
 247         ureq->flow_control               = kreq->flow_control;
 248         ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
 249         ureq->retry_count                = kreq->retry_count;
 250         ureq->rnr_retry_count            = kreq->rnr_retry_count;
 251         ureq->srq                        = kreq->srq;
 252         ureq->port                       = kreq->port;
 253
 254         ib_ucm_event_path_get(&ureq->primary_path, kreq->primary_path);
 255         ib_ucm_event_path_get(&ureq->alternate_path, kreq->alternate_path);
 256 }
 257
 258 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
 259                                  struct ib_cm_rep_event_param *krep)
 260 {
 261         urep->remote_ca_guid      = krep->remote_ca_guid;
 262         urep->remote_qkey         = krep->remote_qkey;
 263         urep->remote_qpn          = krep->remote_qpn;
 264         urep->starting_psn        = krep->starting_psn;
 265         urep->responder_resources = krep->responder_resources;
 266         urep->initiator_depth     = krep->initiator_depth;
 267         urep->target_ack_delay    = krep->target_ack_delay;
 268         urep->failover_accepted   = krep->failover_accepted;
 269         urep->flow_control        = krep->flow_control;
 270         urep->rnr_retry_count     = krep->rnr_retry_count;
 271         urep->srq                 = krep->srq;
 272 }
 273
 274 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
 275                                       struct ib_cm_sidr_rep_event_param *krep)
 276 {
 277         urep->status = krep->status;
 278         urep->qkey   = krep->qkey;
 279         urep->qpn    = krep->qpn;
 280 };
 281
 282 static int ib_ucm_event_process(struct ib_cm_event *evt,
 283                                 struct ib_ucm_event *uvt)
 284 {
 285         void *info = NULL;
 286
 287         switch (evt->event) {
 288         case IB_CM_REQ_RECEIVED:
 289                 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
 290                                      &evt->param.req_rcvd);
 291                 uvt->data_len      = IB_CM_REQ_PRIVATE_DATA_SIZE;
 292                 uvt->resp.present  = IB_UCM_PRES_PRIMARY;
 293                 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
 294                                       IB_UCM_PRES_ALTERNATE : 0);
 295                 break;
 296         case IB_CM_REP_RECEIVED:
 297                 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
 298                                      &evt->param.rep_rcvd);
 299                 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
 300                 break;
 301         case IB_CM_RTU_RECEIVED:
 302                 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
 303                 uvt->resp.u.send_status = evt->param.send_status;
 304                 break;
 305         case IB_CM_DREQ_RECEIVED:
 306                 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
 307                 uvt->resp.u.send_status = evt->param.send_status;
 308                 break;
 309         case IB_CM_DREP_RECEIVED:
 310                 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
 311                 uvt->resp.u.send_status = evt->param.send_status;
 312                 break;
 313         case IB_CM_MRA_RECEIVED:
 314                 uvt->resp.u.mra_resp.timeout =
 315                                         evt->param.mra_rcvd.service_timeout;
 316                 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
 317                 break;
 318         case IB_CM_REJ_RECEIVED:
 319                 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
 320                 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
 321                 uvt->info_len = evt->param.rej_rcvd.ari_length;
 322                 info          = evt->param.rej_rcvd.ari;
 323                 break;
 324         case IB_CM_LAP_RECEIVED:
 325                 ib_ucm_event_path_get(&uvt->resp.u.lap_resp.path,
 326                                       evt->param.lap_rcvd.alternate_path);
 327                 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
 328                 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
 329                 break;
 330         case IB_CM_APR_RECEIVED:
 331                 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
 332                 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
 333                 uvt->info_len = evt->param.apr_rcvd.info_len;
 334                 info          = evt->param.apr_rcvd.apr_info;
 335                 break;
 336         case IB_CM_SIDR_REQ_RECEIVED:
 337                 uvt->resp.u.sidr_req_resp.pkey =
 338                                         evt->param.sidr_req_rcvd.pkey;
 339                 uvt->resp.u.sidr_req_resp.port =
 340                                         evt->param.sidr_req_rcvd.port;
 341                 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
 342                 break;
 343         case IB_CM_SIDR_REP_RECEIVED:
 344                 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
 345                                           &evt->param.sidr_rep_rcvd);
 346                 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
 347                 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
 348                 info          = evt->param.sidr_rep_rcvd.info;
 349                 break;
 350         default:
 351                 uvt->resp.u.send_status = evt->param.send_status;
 352                 break;
 353         }
 354
 355         if (uvt->data_len) {
 356                 uvt->data = kmalloc(uvt->data_len, GFP_KERNEL);
 357                 if (!uvt->data)
 358                         goto err1;
 359
 360                 memcpy(uvt->data, evt->private_data, uvt->data_len);
 361                 uvt->resp.present |= IB_UCM_PRES_DATA;
 362         }
 363
 364         if (uvt->info_len) {
 365                 uvt->info = kmalloc(uvt->info_len, GFP_KERNEL);
 366                 if (!uvt->info)
 367                         goto err2;
 368
 369                 memcpy(uvt->info, info, uvt->info_len);
 370                 uvt->resp.present |= IB_UCM_PRES_INFO;
 371         }
 372         return 0;
 373
 374 err2:
 375         kfree(uvt->data);
 376 err1:
 377         return -ENOMEM;
 378 }
 379
 380 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
 381                                 struct ib_cm_event *event)
 382 {
 383         struct ib_ucm_event *uevent;
 384         struct ib_ucm_context *ctx;
 385         int result = 0;
 386
 387         ctx = cm_id->context;
 388
 389         uevent = kmalloc(sizeof(*uevent), GFP_KERNEL);
 390         if (!uevent)
 391                 goto err1;
 392
 393         memset(uevent, 0, sizeof(*uevent));
 394         uevent->ctx = ctx;
 395         uevent->cm_id = cm_id;
 396         uevent->resp.uid = ctx->uid;
 397         uevent->resp.id = ctx->id;
 398         uevent->resp.event = event->event;
 399
 400         result = ib_ucm_event_process(event, uevent);
 401         if (result)
 402                 goto err2;
 403
 404         down(&ctx->file->mutex);
 405         list_add_tail(&uevent->file_list, &ctx->file->events);
 406         list_add_tail(&uevent->ctx_list, &ctx->events);
 407         wake_up_interruptible(&ctx->file->poll_wait);
 408         up(&ctx->file->mutex);
 409         return 0;
 410
 411 err2:
 412         kfree(uevent);
 413 err1:
 414         /* Destroy new cm_id's */
 415         return ib_ucm_new_cm_id(event->event);
 416 }
 417
 418 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
 419                             const char __user *inbuf,
 420                             int in_len, int out_len)
 421 {
 422         struct ib_ucm_context *ctx;
 423         struct ib_ucm_event_get cmd;
 424         struct ib_ucm_event *uevent;
 425         int result = 0;
 426         DEFINE_WAIT(wait);
 427
 428         if (out_len < sizeof(struct ib_ucm_event_resp))
 429                 return -ENOSPC;
 430
 431         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 432                 return -EFAULT;
 433
 434         down(&file->mutex);
 435         while (list_empty(&file->events)) {
 436
 437                 if (file->filp->f_flags & O_NONBLOCK) {
 438                         result = -EAGAIN;
 439                         break;
 440                 }
 441
 442                 if (signal_pending(current)) {
 443                         result = -ERESTARTSYS;
 444                         break;
 445                 }
 446
 447                 prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE);
 448
 449                 up(&file->mutex);
 450                 schedule();
 451                 down(&file->mutex);
 452
 453                 finish_wait(&file->poll_wait, &wait);
 454         }
 455
 456         if (result)
 457                 goto done;
 458
 459         uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
 460
 461         if (ib_ucm_new_cm_id(uevent->resp.event)) {
 462                 ctx = ib_ucm_ctx_alloc(file);
 463                 if (!ctx) {
 464                         result = -ENOMEM;
 465                         goto done;
 466                 }
 467
 468                 ctx->cm_id = uevent->cm_id;
 469                 ctx->cm_id->context = ctx;
 470                 uevent->resp.id = ctx->id;
 471         }
 472
 473         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 474                          &uevent->resp, sizeof(uevent->resp))) {
 475                 result = -EFAULT;
 476                 goto done;
 477         }
 478
 479         if (uevent->data) {
 480                 if (cmd.data_len < uevent->data_len) {
 481                         result = -ENOMEM;
 482                         goto done;
 483                 }
 484                 if (copy_to_user((void __user *)(unsigned long)cmd.data,
 485                                  uevent->data, uevent->data_len)) {
 486                         result = -EFAULT;
 487                         goto done;
 488                 }
 489         }
 490
 491         if (uevent->info) {
 492                 if (cmd.info_len < uevent->info_len) {
 493                         result = -ENOMEM;
 494                         goto done;
 495                 }
 496                 if (copy_to_user((void __user *)(unsigned long)cmd.info,
 497                                  uevent->info, uevent->info_len)) {
 498                         result = -EFAULT;
 499                         goto done;
 500                 }
 501         }
 502
 503         list_del(&uevent->file_list);
 504         list_del(&uevent->ctx_list);
 505         uevent->ctx->events_reported++;
 506
 507         kfree(uevent->data);
 508         kfree(uevent->info);
 509         kfree(uevent);
 510 done:
 511         up(&file->mutex);
 512         return result;
 513 }
 514
 515 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
 516                                 const char __user *inbuf,
 517                                 int in_len, int out_len)
 518 {
 519         struct ib_ucm_create_id cmd;
 520         struct ib_ucm_create_id_resp resp;
 521         struct ib_ucm_context *ctx;
 522         int result;
 523
 524         if (out_len < sizeof(resp))
 525                 return -ENOSPC;
 526
 527         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 528                 return -EFAULT;
 529
 530         down(&file->mutex);
 531         ctx = ib_ucm_ctx_alloc(file);
 532         up(&file->mutex);
 533         if (!ctx)
 534                 return -ENOMEM;
 535
 536         ctx->uid = cmd.uid;
 537         ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
 538                                      ib_ucm_event_handler, ctx);
 539         if (IS_ERR(ctx->cm_id)) {
 540                 result = PTR_ERR(ctx->cm_id);
 541                 goto err1;
 542         }
 543
 544         resp.id = ctx->id;
 545         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 546                          &resp, sizeof(resp))) {
 547                 result = -EFAULT;
 548                 goto err2;
 549         }
 550         return 0;
 551
 552 err2:
 553         ib_destroy_cm_id(ctx->cm_id);
 554 err1:
 555         down(&ctx_id_mutex);
 556         idr_remove(&ctx_id_table, ctx->id);
 557         up(&ctx_id_mutex);
 558         kfree(ctx);
 559         return result;
 560 }
 561
 562 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
 563                                  const char __user *inbuf,
 564                                  int in_len, int out_len)
 565 {
 566         struct ib_ucm_destroy_id cmd;
 567         struct ib_ucm_destroy_id_resp resp;
 568         struct ib_ucm_context *ctx;
 569         int result = 0;
 570
 571         if (out_len < sizeof(resp))
 572                 return -ENOSPC;
 573
 574         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 575                 return -EFAULT;
 576
 577         down(&ctx_id_mutex);
 578         ctx = idr_find(&ctx_id_table, cmd.id);
 579         if (!ctx)
 580                 ctx = ERR_PTR(-ENOENT);
 581         else if (ctx->file != file)
 582                 ctx = ERR_PTR(-EINVAL);
 583         else
 584                 idr_remove(&ctx_id_table, ctx->id);
 585         up(&ctx_id_mutex);
 586
 587         if (IS_ERR(ctx))
 588                 return PTR_ERR(ctx);
 589
 590         atomic_dec(&ctx->ref);
 591         wait_event(ctx->wait, !atomic_read(&ctx->ref));
 592
 593         /* No new events will be generated after destroying the cm_id. */
 594         ib_destroy_cm_id(ctx->cm_id);
 595         /* Cleanup events not yet reported to the user. */
 596         ib_ucm_cleanup_events(ctx);
 597
 598         resp.events_reported = ctx->events_reported;
 599         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 600                          &resp, sizeof(resp)))
 601                 result = -EFAULT;
 602
 603         kfree(ctx);
 604         return result;
 605 }
 606
 607 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
 608                               const char __user *inbuf,
 609                               int in_len, int out_len)
 610 {
 611         struct ib_ucm_attr_id_resp resp;
 612         struct ib_ucm_attr_id cmd;
 613         struct ib_ucm_context *ctx;
 614         int result = 0;
 615
 616         if (out_len < sizeof(resp))
 617                 return -ENOSPC;
 618
 619         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 620                 return -EFAULT;
 621
 622         ctx = ib_ucm_ctx_get(file, cmd.id);
 623         if (IS_ERR(ctx))
 624                 return PTR_ERR(ctx);
 625
 626         resp.service_id   = ctx->cm_id->service_id;
 627         resp.service_mask = ctx->cm_id->service_mask;
 628         resp.local_id     = ctx->cm_id->local_id;
 629         resp.remote_id    = ctx->cm_id->remote_id;
 630
 631         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 632                          &resp, sizeof(resp)))
 633                 result = -EFAULT;
 634
 635         ib_ucm_ctx_put(ctx);
 636         return result;
 637 }
 638
 639 static void ib_ucm_copy_ah_attr(struct ib_ucm_ah_attr *dest_attr,
 640                                 struct ib_ah_attr *src_attr)
 641 {
 642         memcpy(dest_attr->grh_dgid, src_attr->grh.dgid.raw,
 643                sizeof src_attr->grh.dgid);
 644         dest_attr->grh_flow_label = src_attr->grh.flow_label;
 645         dest_attr->grh_sgid_index = src_attr->grh.sgid_index;
 646         dest_attr->grh_hop_limit = src_attr->grh.hop_limit;
 647         dest_attr->grh_traffic_class = src_attr->grh.traffic_class;
 648
 649         dest_attr->dlid = src_attr->dlid;
 650         dest_attr->sl = src_attr->sl;
 651         dest_attr->src_path_bits = src_attr->src_path_bits;
 652         dest_attr->static_rate = src_attr->static_rate;
 653         dest_attr->is_global = (src_attr->ah_flags & IB_AH_GRH);
 654         dest_attr->port_num = src_attr->port_num;
 655 }
 656
 657 static void ib_ucm_copy_qp_attr(struct ib_ucm_init_qp_attr_resp *dest_attr,
 658                                 struct ib_qp_attr *src_attr)
 659 {
 660         dest_attr->cur_qp_state = src_attr->cur_qp_state;
 661         dest_attr->path_mtu = src_attr->path_mtu;
 662         dest_attr->path_mig_state = src_attr->path_mig_state;
 663         dest_attr->qkey = src_attr->qkey;
 664         dest_attr->rq_psn = src_attr->rq_psn;
 665         dest_attr->sq_psn = src_attr->sq_psn;
 666         dest_attr->dest_qp_num = src_attr->dest_qp_num;
 667         dest_attr->qp_access_flags = src_attr->qp_access_flags;
 668
 669         dest_attr->max_send_wr = src_attr->cap.max_send_wr;
 670         dest_attr->max_recv_wr = src_attr->cap.max_recv_wr;
 671         dest_attr->max_send_sge = src_attr->cap.max_send_sge;
 672         dest_attr->max_recv_sge = src_attr->cap.max_recv_sge;
 673         dest_attr->max_inline_data = src_attr->cap.max_inline_data;
 674
 675         ib_ucm_copy_ah_attr(&dest_attr->ah_attr, &src_attr->ah_attr);
 676         ib_ucm_copy_ah_attr(&dest_attr->alt_ah_attr, &src_attr->alt_ah_attr);
 677
 678         dest_attr->pkey_index = src_attr->pkey_index;
 679         dest_attr->alt_pkey_index = src_attr->alt_pkey_index;
 680         dest_attr->en_sqd_async_notify = src_attr->en_sqd_async_notify;
 681         dest_attr->sq_draining = src_attr->sq_draining;
 682         dest_attr->max_rd_atomic = src_attr->max_rd_atomic;
 683         dest_attr->max_dest_rd_atomic = src_attr->max_dest_rd_atomic;
 684         dest_attr->min_rnr_timer = src_attr->min_rnr_timer;
 685         dest_attr->port_num = src_attr->port_num;
 686         dest_attr->timeout = src_attr->timeout;
 687         dest_attr->retry_cnt = src_attr->retry_cnt;
 688         dest_attr->rnr_retry = src_attr->rnr_retry;
 689         dest_attr->alt_port_num = src_attr->alt_port_num;
 690         dest_attr->alt_timeout = src_attr->alt_timeout;
 691 }
 692
 693 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
 694                                    const char __user *inbuf,
 695                                    int in_len, int out_len)
 696 {
 697         struct ib_ucm_init_qp_attr_resp resp;
 698         struct ib_ucm_init_qp_attr cmd;
 699         struct ib_ucm_context *ctx;
 700         struct ib_qp_attr qp_attr;
 701         int result = 0;
 702
 703         if (out_len < sizeof(resp))
 704                 return -ENOSPC;
 705
 706         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 707                 return -EFAULT;
 708
 709         ctx = ib_ucm_ctx_get(file, cmd.id);
 710         if (IS_ERR(ctx))
 711                 return PTR_ERR(ctx);
 712
 713         resp.qp_attr_mask = 0;
 714         memset(&qp_attr, 0, sizeof qp_attr);
 715         qp_attr.qp_state = cmd.qp_state;
 716         result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
 717         if (result)
 718                 goto out;
 719
 720         ib_ucm_copy_qp_attr(&resp, &qp_attr);
 721
 722         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 723                          &resp, sizeof(resp)))
 724                 result = -EFAULT;
 725
 726 out:
 727         ib_ucm_ctx_put(ctx);
 728         return result;
 729 }
 730
 731 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
 732                              const char __user *inbuf,
 733                              int in_len, int out_len)
 734 {
 735         struct ib_ucm_listen cmd;
 736         struct ib_ucm_context *ctx;
 737         int result;
 738
 739         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 740                 return -EFAULT;
 741
 742         ctx = ib_ucm_ctx_get(file, cmd.id);
 743         if (IS_ERR(ctx))
 744                 return PTR_ERR(ctx);
 745
 746         result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask);
 747         ib_ucm_ctx_put(ctx);
 748         return result;
 749 }
 750
 751 static ssize_t ib_ucm_establish(struct ib_ucm_file *file,
 752                                 const char __user *inbuf,
 753                                 int in_len, int out_len)
 754 {
 755         struct ib_ucm_establish cmd;
 756         struct ib_ucm_context *ctx;
 757         int result;
 758
 759         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 760                 return -EFAULT;
 761
 762         ctx = ib_ucm_ctx_get(file, cmd.id);
 763         if (IS_ERR(ctx))
 764                 return PTR_ERR(ctx);
 765
 766         result = ib_cm_establish(ctx->cm_id);
 767         ib_ucm_ctx_put(ctx);
 768         return result;
 769 }
 770
 771 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
 772 {
 773         void *data;
 774
 775         *dest = NULL;
 776
 777         if (!len)
 778                 return 0;
 779
 780         data = kmalloc(len, GFP_KERNEL);
 781         if (!data)
 782                 return -ENOMEM;
 783
 784         if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
 785                 kfree(data);
 786                 return -EFAULT;
 787         }
 788
 789         *dest = data;
 790         return 0;
 791 }
 792
 793 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
 794 {
 795         struct ib_ucm_path_rec ucm_path;
 796         struct ib_sa_path_rec  *sa_path;
 797
 798         *path = NULL;
 799
 800         if (!src)
 801                 return 0;
 802
 803         sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
 804         if (!sa_path)
 805                 return -ENOMEM;
 806
 807         if (copy_from_user(&ucm_path, (void __user *)(unsigned long)src,
 808                            sizeof(ucm_path))) {
 809
 810                 kfree(sa_path);
 811                 return -EFAULT;
 812         }
 813
 814         memcpy(sa_path->dgid.raw, ucm_path.dgid, sizeof sa_path->dgid);
 815         memcpy(sa_path->sgid.raw, ucm_path.sgid, sizeof sa_path->sgid);
 816
 817         sa_path->dlid             = ucm_path.dlid;
 818         sa_path->slid             = ucm_path.slid;
 819         sa_path->raw_traffic      = ucm_path.raw_traffic;
 820         sa_path->flow_label       = ucm_path.flow_label;
 821         sa_path->hop_limit        = ucm_path.hop_limit;
 822         sa_path->traffic_class    = ucm_path.traffic_class;
 823         sa_path->reversible       = ucm_path.reversible;
 824         sa_path->numb_path        = ucm_path.numb_path;
 825         sa_path->pkey             = ucm_path.pkey;
 826         sa_path->sl               = ucm_path.sl;
 827         sa_path->mtu_selector     = ucm_path.mtu_selector;
 828         sa_path->mtu              = ucm_path.mtu;
 829         sa_path->rate_selector    = ucm_path.rate_selector;
 830         sa_path->rate             = ucm_path.rate;
 831         sa_path->packet_life_time = ucm_path.packet_life_time;
 832         sa_path->preference       = ucm_path.preference;
 833
 834         sa_path->packet_life_time_selector =
 835                 ucm_path.packet_life_time_selector;
 836
 837         *path = sa_path;
 838         return 0;
 839 }
 840
 841 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
 842                                const char __user *inbuf,
 843                                int in_len, int out_len)
 844 {
 845         struct ib_cm_req_param param;
 846         struct ib_ucm_context *ctx;
 847         struct ib_ucm_req cmd;
 848         int result;
 849
 850         param.private_data   = NULL;
 851         param.primary_path   = NULL;
 852         param.alternate_path = NULL;
 853
 854         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 855                 return -EFAULT;
 856
 857         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
 858         if (result)
 859                 goto done;
 860
 861         result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
 862         if (result)
 863                 goto done;
 864
 865         result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
 866         if (result)
 867                 goto done;
 868
 869         param.private_data_len           = cmd.len;
 870         param.service_id                 = cmd.sid;
 871         param.qp_num                     = cmd.qpn;
 872         param.qp_type                    = cmd.qp_type;
 873         param.starting_psn               = cmd.psn;
 874         param.peer_to_peer               = cmd.peer_to_peer;
 875         param.responder_resources        = cmd.responder_resources;
 876         param.initiator_depth            = cmd.initiator_depth;
 877         param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
 878         param.flow_control               = cmd.flow_control;
 879         param.local_cm_response_timeout  = cmd.local_cm_response_timeout;
 880         param.retry_count                = cmd.retry_count;
 881         param.rnr_retry_count            = cmd.rnr_retry_count;
 882         param.max_cm_retries             = cmd.max_cm_retries;
 883         param.srq                        = cmd.srq;
 884
 885         ctx = ib_ucm_ctx_get(file, cmd.id);
 886         if (!IS_ERR(ctx)) {
 887                 result = ib_send_cm_req(ctx->cm_id, &param);
 888                 ib_ucm_ctx_put(ctx);
 889         } else
 890                 result = PTR_ERR(ctx);
 891
 892 done:
 893         kfree(param.private_data);
 894         kfree(param.primary_path);
 895         kfree(param.alternate_path);
 896         return result;
 897 }
 898
 899 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
 900                                const char __user *inbuf,
 901                                int in_len, int out_len)
 902 {
 903         struct ib_cm_rep_param param;
 904         struct ib_ucm_context *ctx;
 905         struct ib_ucm_rep cmd;
 906         int result;
 907
 908         param.private_data = NULL;
 909
 910         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 911                 return -EFAULT;
 912
 913         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
 914         if (result)
 915                 return result;
 916
 917         param.qp_num              = cmd.qpn;
 918         param.starting_psn        = cmd.psn;
 919         param.private_data_len    = cmd.len;
 920         param.responder_resources = cmd.responder_resources;
 921         param.initiator_depth     = cmd.initiator_depth;
 922         param.target_ack_delay    = cmd.target_ack_delay;
 923         param.failover_accepted   = cmd.failover_accepted;
 924         param.flow_control        = cmd.flow_control;
 925         param.rnr_retry_count     = cmd.rnr_retry_count;
 926         param.srq                 = cmd.srq;
 927
 928         ctx = ib_ucm_ctx_get(file, cmd.id);
 929         if (!IS_ERR(ctx)) {
 930                 ctx->uid = cmd.uid;
 931                 result = ib_send_cm_rep(ctx->cm_id, &param);
 932                 ib_ucm_ctx_put(ctx);
 933         } else
 934                 result = PTR_ERR(ctx);
 935
 936         kfree(param.private_data);
 937         return result;
 938 }
 939
 940 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
 941                                         const char __user *inbuf, int in_len,
 942                                         int (*func)(struct ib_cm_id *cm_id,
 943                                                     const void *private_data,
 944                                                     u8 private_data_len))
 945 {
 946         struct ib_ucm_private_data cmd;
 947         struct ib_ucm_context *ctx;
 948         const void *private_data = NULL;
 949         int result;
 950
 951         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 952                 return -EFAULT;
 953
 954         result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
 955         if (result)
 956                 return result;
 957
 958         ctx = ib_ucm_ctx_get(file, cmd.id);
 959         if (!IS_ERR(ctx)) {
 960                 result = func(ctx->cm_id, private_data, cmd.len);
 961                 ib_ucm_ctx_put(ctx);
 962         } else
 963                 result = PTR_ERR(ctx);
 964
 965         kfree(private_data);
 966         return result;
 967 }
 968
 969 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
 970                                const char __user *inbuf,
 971                                int in_len, int out_len)
 972 {
 973         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
 974 }
 975
 976 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
 977                                 const char __user *inbuf,
 978                                 int in_len, int out_len)
 979 {
 980         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
 981 }
 982
 983 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
 984                                 const char __user *inbuf,
 985                                 int in_len, int out_len)
 986 {
 987         return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
 988 }
 989
 990 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
 991                                 const char __user *inbuf, int in_len,
 992                                 int (*func)(struct ib_cm_id *cm_id,
 993                                             int status,
 994                                             const void *info,
 995                                             u8 info_len,
 996                                             const void *data,
 997                                             u8 data_len))
 998 {
 999         struct ib_ucm_context *ctx;
1000         struct ib_ucm_info cmd;
1001         const void *data = NULL;
1002         const void *info = NULL;
1003         int result;
1004
1005         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1006                 return -EFAULT;
1007
1008         result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
1009         if (result)
1010                 goto done;
1011
1012         result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
1013         if (result)
1014                 goto done;
1015
1016         ctx = ib_ucm_ctx_get(file, cmd.id);
1017         if (!IS_ERR(ctx)) {
1018                 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
1019                               data, cmd.data_len);
1020                 ib_ucm_ctx_put(ctx);
1021         } else
1022                 result = PTR_ERR(ctx);
1023
1024 done:
1025         kfree(data);
1026         kfree(info);
1027         return result;
1028 }
1029
1030 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
1031                                const char __user *inbuf,
1032                                int in_len, int out_len)
1033 {
1034         return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
1035 }
1036
1037 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
1038                                const char __user *inbuf,
1039                                int in_len, int out_len)
1040 {
1041         return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
1042 }
1043
1044 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
1045                                const char __user *inbuf,
1046                                int in_len, int out_len)
1047 {
1048         struct ib_ucm_context *ctx;
1049         struct ib_ucm_mra cmd;
1050         const void *data = NULL;
1051         int result;
1052
1053         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1054                 return -EFAULT;
1055
1056         result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
1057         if (result)
1058                 return result;
1059
1060         ctx = ib_ucm_ctx_get(file, cmd.id);
1061         if (!IS_ERR(ctx)) {
1062                 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
1063                 ib_ucm_ctx_put(ctx);
1064         } else
1065                 result = PTR_ERR(ctx);
1066
1067         kfree(data);
1068         return result;
1069 }
1070
1071 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
1072                                const char __user *inbuf,
1073                                int in_len, int out_len)
1074 {
1075         struct ib_ucm_context *ctx;
1076         struct ib_sa_path_rec *path = NULL;
1077         struct ib_ucm_lap cmd;
1078         const void *data = NULL;
1079         int result;
1080
1081         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1082                 return -EFAULT;
1083
1084         result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
1085         if (result)
1086                 goto done;
1087
1088         result = ib_ucm_path_get(&path, cmd.path);
1089         if (result)
1090                 goto done;
1091
1092         ctx = ib_ucm_ctx_get(file, cmd.id);
1093         if (!IS_ERR(ctx)) {
1094                 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
1095                 ib_ucm_ctx_put(ctx);
1096         } else
1097                 result = PTR_ERR(ctx);
1098
1099 done:
1100         kfree(data);
1101         kfree(path);
1102         return result;
1103 }
1104
1105 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1106                                     const char __user *inbuf,
1107                                     int in_len, int out_len)
1108 {
1109         struct ib_cm_sidr_req_param param;
1110         struct ib_ucm_context *ctx;
1111         struct ib_ucm_sidr_req cmd;
1112         int result;
1113
1114         param.private_data = NULL;
1115         param.path = NULL;
1116
1117         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1118                 return -EFAULT;
1119
1120         result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
1121         if (result)
1122                 goto done;
1123
1124         result = ib_ucm_path_get(&param.path, cmd.path);
1125         if (result)
1126                 goto done;
1127
1128         param.private_data_len = cmd.len;
1129         param.service_id       = cmd.sid;
1130         param.timeout_ms       = cmd.timeout;
1131         param.max_cm_retries   = cmd.max_cm_retries;
1132         param.pkey             = cmd.pkey;
1133
1134         ctx = ib_ucm_ctx_get(file, cmd.id);
1135         if (!IS_ERR(ctx)) {
1136                 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1137                 ib_ucm_ctx_put(ctx);
1138         } else
1139                 result = PTR_ERR(ctx);
1140
1141 done:
1142         kfree(param.private_data);
1143         kfree(param.path);
1144         return result;
1145 }
1146
1147 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1148                                     const char __user *inbuf,
1149                                     int in_len, int out_len)
1150 {
1151         struct ib_cm_sidr_rep_param param;
1152         struct ib_ucm_sidr_rep cmd;
1153         struct ib_ucm_context *ctx;
1154         int result;
1155
1156         param.info = NULL;
1157
1158         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1159                 return -EFAULT;
1160
1161         result = ib_ucm_alloc_data(&param.private_data,
1162                                    cmd.data, cmd.data_len);
1163         if (result)
1164                 goto done;
1165
1166         result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1167         if (result)
1168                 goto done;
1169
1170         param.qp_num            = cmd.qpn;
1171         param.qkey              = cmd.qkey;
1172         param.status            = cmd.status;
1173         param.info_length       = cmd.info_len;
1174         param.private_data_len  = cmd.data_len;
1175
1176         ctx = ib_ucm_ctx_get(file, cmd.id);
1177         if (!IS_ERR(ctx)) {
1178                 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1179                 ib_ucm_ctx_put(ctx);
1180         } else
1181                 result = PTR_ERR(ctx);
1182
1183 done:
1184         kfree(param.private_data);
1185         kfree(param.info);
1186         return result;
1187 }
1188
1189 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1190                                   const char __user *inbuf,
1191                                   int in_len, int out_len) = {
1192         [IB_USER_CM_CMD_CREATE_ID]     = ib_ucm_create_id,
1193         [IB_USER_CM_CMD_DESTROY_ID]    = ib_ucm_destroy_id,
1194         [IB_USER_CM_CMD_ATTR_ID]       = ib_ucm_attr_id,
1195         [IB_USER_CM_CMD_LISTEN]        = ib_ucm_listen,
1196         [IB_USER_CM_CMD_ESTABLISH]     = ib_ucm_establish,
1197         [IB_USER_CM_CMD_SEND_REQ]      = ib_ucm_send_req,
1198         [IB_USER_CM_CMD_SEND_REP]      = ib_ucm_send_rep,
1199         [IB_USER_CM_CMD_SEND_RTU]      = ib_ucm_send_rtu,
1200         [IB_USER_CM_CMD_SEND_DREQ]     = ib_ucm_send_dreq,
1201         [IB_USER_CM_CMD_SEND_DREP]     = ib_ucm_send_drep,
1202         [IB_USER_CM_CMD_SEND_REJ]      = ib_ucm_send_rej,
1203         [IB_USER_CM_CMD_SEND_MRA]      = ib_ucm_send_mra,
1204         [IB_USER_CM_CMD_SEND_LAP]      = ib_ucm_send_lap,
1205         [IB_USER_CM_CMD_SEND_APR]      = ib_ucm_send_apr,
1206         [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1207         [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1208         [IB_USER_CM_CMD_EVENT]         = ib_ucm_event,
1209         [IB_USER_CM_CMD_INIT_QP_ATTR]  = ib_ucm_init_qp_attr,
1210 };
1211
1212 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1213                             size_t len, loff_t *pos)
1214 {
1215         struct ib_ucm_file *file = filp->private_data;
1216         struct ib_ucm_cmd_hdr hdr;
1217         ssize_t result;
1218
1219         if (len < sizeof(hdr))
1220                 return -EINVAL;
1221
1222         if (copy_from_user(&hdr, buf, sizeof(hdr)))
1223                 return -EFAULT;
1224
1225         if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1226                 return -EINVAL;
1227
1228         if (hdr.in + sizeof(hdr) > len)
1229                 return -EINVAL;
1230
1231         result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1232                                         hdr.in, hdr.out);
1233         if (!result)
1234                 result = len;
1235
1236         return result;
1237 }
1238
1239 static unsigned int ib_ucm_poll(struct file *filp,
1240                                 struct poll_table_struct *wait)
1241 {
1242         struct ib_ucm_file *file = filp->private_data;
1243         unsigned int mask = 0;
1244
1245         poll_wait(filp, &file->poll_wait, wait);
1246
1247         if (!list_empty(&file->events))
1248                 mask = POLLIN | POLLRDNORM;
1249
1250         return mask;
1251 }
1252
1253 static int ib_ucm_open(struct inode *inode, struct file *filp)
1254 {
1255         struct ib_ucm_file *file;
1256
1257         file = kmalloc(sizeof(*file), GFP_KERNEL);
1258         if (!file)
1259                 return -ENOMEM;
1260
1261         INIT_LIST_HEAD(&file->events);
1262         INIT_LIST_HEAD(&file->ctxs);
1263         init_waitqueue_head(&file->poll_wait);
1264
1265         init_MUTEX(&file->mutex);
1266
1267         filp->private_data = file;
1268         file->filp = filp;
1269         file->device = container_of(inode->i_cdev, struct ib_ucm_device, dev);
1270
1271         return 0;
1272 }
1273
1274 static int ib_ucm_close(struct inode *inode, struct file *filp)
1275 {
1276         struct ib_ucm_file *file = filp->private_data;
1277         struct ib_ucm_context *ctx;
1278
1279         down(&file->mutex);
1280         while (!list_empty(&file->ctxs)) {
1281                 ctx = list_entry(file->ctxs.next,
1282                                  struct ib_ucm_context, file_list);
1283                 up(&file->mutex);
1284
1285                 down(&ctx_id_mutex);
1286                 idr_remove(&ctx_id_table, ctx->id);
1287                 up(&ctx_id_mutex);
1288
1289                 ib_destroy_cm_id(ctx->cm_id);
1290                 ib_ucm_cleanup_events(ctx);
1291                 kfree(ctx);
1292
1293                 down(&file->mutex);
1294         }
1295         up(&file->mutex);
1296         kfree(file);
1297         return 0;
1298 }
1299
1300 static void ib_ucm_release_class_dev(struct class_device *class_dev)
1301 {
1302         struct ib_ucm_device *dev;
1303
1304         dev = container_of(class_dev, struct ib_ucm_device, class_dev);
1305         cdev_del(&dev->dev);
1306         clear_bit(dev->devnum, dev_map);
1307         kfree(dev);
1308 }
1309
1310 static struct file_operations ucm_fops = {
1311         .owner   = THIS_MODULE,
1312         .open    = ib_ucm_open,
1313         .release = ib_ucm_close,
1314         .write   = ib_ucm_write,
1315         .poll    = ib_ucm_poll,
1316 };
1317
1318 static struct class ucm_class = {
1319         .name    = "infiniband_cm",
1320         .release = ib_ucm_release_class_dev
1321 };
1322
1323 static ssize_t show_dev(struct class_device *class_dev, char *buf)
1324 {
1325         struct ib_ucm_device *dev;
1326
1327         dev = container_of(class_dev, struct ib_ucm_device, class_dev);
1328         return print_dev_t(buf, dev->dev.dev);
1329 }
1330 static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL);
1331
1332 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1333 {
1334         struct ib_ucm_device *dev;
1335
1336         dev = container_of(class_dev, struct ib_ucm_device, class_dev);
1337         return sprintf(buf, "%s\n", dev->ib_dev->name);
1338 }
1339 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1340
1341 static void ib_ucm_add_one(struct ib_device *device)
1342 {
1343         struct ib_ucm_device *ucm_dev;
1344
1345         if (!device->alloc_ucontext)
1346                 return;
1347
1348         ucm_dev = kmalloc(sizeof *ucm_dev, GFP_KERNEL);
1349         if (!ucm_dev)
1350                 return;
1351
1352         memset(ucm_dev, 0, sizeof *ucm_dev);
1353         ucm_dev->ib_dev = device;
1354
1355         ucm_dev->devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1356         if (ucm_dev->devnum >= IB_UCM_MAX_DEVICES)
1357                 goto err;
1358
1359         set_bit(ucm_dev->devnum, dev_map);
1360
1361         cdev_init(&ucm_dev->dev, &ucm_fops);
1362         ucm_dev->dev.owner = THIS_MODULE;
1363         kobject_set_name(&ucm_dev->dev.kobj, "ucm%d", ucm_dev->devnum);
1364         if (cdev_add(&ucm_dev->dev, IB_UCM_BASE_DEV + ucm_dev->devnum, 1))
1365                 goto err;
1366
1367         ucm_dev->class_dev.class = &ucm_class;
1368         ucm_dev->class_dev.dev = device->dma_device;
1369         snprintf(ucm_dev->class_dev.class_id, BUS_ID_SIZE, "ucm%d",
1370                  ucm_dev->devnum);
1371         if (class_device_register(&ucm_dev->class_dev))
1372                 goto err_cdev;
1373
1374         if (class_device_create_file(&ucm_dev->class_dev,
1375                                      &class_device_attr_dev))
1376                 goto err_class;
1377         if (class_device_create_file(&ucm_dev->class_dev,
1378                                      &class_device_attr_ibdev))
1379                 goto err_class;
1380
1381         ib_set_client_data(device, &ucm_client, ucm_dev);
1382         return;
1383
1384 err_class:
1385         class_device_unregister(&ucm_dev->class_dev);
1386 err_cdev:
1387         cdev_del(&ucm_dev->dev);
1388         clear_bit(ucm_dev->devnum, dev_map);
1389 err:
1390         kfree(ucm_dev);
1391         return;
1392 }
1393
1394 static void ib_ucm_remove_one(struct ib_device *device)
1395 {
1396         struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1397
1398         if (!ucm_dev)
1399                 return;
1400
1401         class_device_unregister(&ucm_dev->class_dev);
1402 }
1403
1404 static ssize_t show_abi_version(struct class *class, char *buf)
1405 {
1406         return sprintf(buf, "%d\n", IB_USER_CM_ABI_VERSION);
1407 }
1408 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1409
1410 static int __init ib_ucm_init(void)
1411 {
1412         int ret;
1413
1414         ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1415                                      "infiniband_cm");
1416         if (ret) {
1417                 printk(KERN_ERR "ucm: couldn't register device number\n");
1418                 goto err;
1419         }
1420
1421         ret = class_register(&ucm_class);
1422         if (ret) {
1423                 printk(KERN_ERR "ucm: couldn't create class infiniband_cm\n");
1424                 goto err_chrdev;
1425         }
1426
1427         ret = class_create_file(&ucm_class, &class_attr_abi_version);
1428         if (ret) {
1429                 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1430                 goto err_class;
1431         }
1432
1433         ret = ib_register_client(&ucm_client);
1434         if (ret) {
1435                 printk(KERN_ERR "ucm: couldn't register client\n");
1436                 goto err_class;
1437         }
1438         return 0;
1439
1440 err_class:
1441         class_unregister(&ucm_class);
1442 err_chrdev:
1443         unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1444 err:
1445         return ret;
1446 }
1447
1448 static void __exit ib_ucm_cleanup(void)
1449 {
1450         ib_unregister_client(&ucm_client);
1451         class_unregister(&ucm_class);
1452         unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1453 }
1454
1455 module_init(ib_ucm_init);
1456 module_exit(ib_ucm_cleanup);