drivers/infiniband/core/verbs.c

   1 /*
   2  * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
   3  * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
   4  * Copyright (c) 2004 Intel Corporation.  All rights reserved.
   5  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   6  * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
   7  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   8  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
   9  *
  10  * This software is available to you under a choice of one of two
  11  * licenses.  You may choose to be licensed under the terms of the GNU
  12  * General Public License (GPL) Version 2, available from the file
  13  * COPYING in the main directory of this source tree, or the
  14  * OpenIB.org BSD license below:
  15  *
  16  *     Redistribution and use in source and binary forms, with or
  17  *     without modification, are permitted provided that the following
  18  *     conditions are met:
  19  *
  20  *      - Redistributions of source code must retain the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer.
  23  *
  24  *      - Redistributions in binary form must reproduce the above
  25  *        copyright notice, this list of conditions and the following
  26  *        disclaimer in the documentation and/or other materials
  27  *        provided with the distribution.
  28  *
  29  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  30  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  31  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  32  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  33  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  34  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  35  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  36  * SOFTWARE.
  37  *
  38  * $Id: verbs.c 1349 2004-12-16 21:09:43Z roland $
  39  */
  40
  41 #include <linux/errno.h>
  42 #include <linux/err.h>
  43 #include <linux/string.h>
  44
  45 #include <rdma/ib_verbs.h>
  46 #include <rdma/ib_cache.h>
  47
  48 /* Protection domains */
  49
  50 struct ib_pd *ib_alloc_pd(struct ib_device *device)
  51 {
  52         struct ib_pd *pd;
  53
  54         pd = device->alloc_pd(device, NULL, NULL);
  55
  56         if (!IS_ERR(pd)) {
  57                 pd->device  = device;
  58                 pd->uobject = NULL;
  59                 atomic_set(&pd->usecnt, 0);
  60         }
  61
  62         return pd;
  63 }
  64 EXPORT_SYMBOL(ib_alloc_pd);
  65
  66 int ib_dealloc_pd(struct ib_pd *pd)
  67 {
  68         if (atomic_read(&pd->usecnt))
  69                 return -EBUSY;
  70
  71         return pd->device->dealloc_pd(pd);
  72 }
  73 EXPORT_SYMBOL(ib_dealloc_pd);
  74
  75 /* Address handles */
  76
  77 struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
  78 {
  79         struct ib_ah *ah;
  80
  81         ah = pd->device->create_ah(pd, ah_attr);
  82
  83         if (!IS_ERR(ah)) {
  84                 ah->device  = pd->device;
  85                 ah->pd      = pd;
  86                 ah->uobject = NULL;
  87                 atomic_inc(&pd->usecnt);
  88         }
  89
  90         return ah;
  91 }
  92 EXPORT_SYMBOL(ib_create_ah);
  93
  94 struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, struct ib_wc *wc,
  95                                    struct ib_grh *grh, u8 port_num)
  96 {
  97         struct ib_ah_attr ah_attr;
  98         u32 flow_class;
  99         u16 gid_index;
 100         int ret;
 101
 102         memset(&ah_attr, 0, sizeof ah_attr);
 103         ah_attr.dlid = wc->slid;
 104         ah_attr.sl = wc->sl;
 105         ah_attr.src_path_bits = wc->dlid_path_bits;
 106         ah_attr.port_num = port_num;
 107
 108         if (wc->wc_flags & IB_WC_GRH) {
 109                 ah_attr.ah_flags = IB_AH_GRH;
 110                 ah_attr.grh.dgid = grh->sgid;
 111
 112                 ret = ib_find_cached_gid(pd->device, &grh->dgid, &port_num,
 113                                          &gid_index);
 114                 if (ret)
 115                         return ERR_PTR(ret);
 116
 117                 ah_attr.grh.sgid_index = (u8) gid_index;
 118                 flow_class = be32_to_cpu(grh->version_tclass_flow);
 119                 ah_attr.grh.flow_label = flow_class & 0xFFFFF;
 120                 ah_attr.grh.traffic_class = (flow_class >> 20) & 0xFF;
 121                 ah_attr.grh.hop_limit = grh->hop_limit;
 122         }
 123
 124         return ib_create_ah(pd, &ah_attr);
 125 }
 126 EXPORT_SYMBOL(ib_create_ah_from_wc);
 127
 128 int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 129 {
 130         return ah->device->modify_ah ?
 131                 ah->device->modify_ah(ah, ah_attr) :
 132                 -ENOSYS;
 133 }
 134 EXPORT_SYMBOL(ib_modify_ah);
 135
 136 int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 137 {
 138         return ah->device->query_ah ?
 139                 ah->device->query_ah(ah, ah_attr) :
 140                 -ENOSYS;
 141 }
 142 EXPORT_SYMBOL(ib_query_ah);
 143
 144 int ib_destroy_ah(struct ib_ah *ah)
 145 {
 146         struct ib_pd *pd;
 147         int ret;
 148
 149         pd = ah->pd;
 150         ret = ah->device->destroy_ah(ah);
 151         if (!ret)
 152                 atomic_dec(&pd->usecnt);
 153
 154         return ret;
 155 }
 156 EXPORT_SYMBOL(ib_destroy_ah);
 157
 158 /* Shared receive queues */
 159
 160 struct ib_srq *ib_create_srq(struct ib_pd *pd,
 161                              struct ib_srq_init_attr *srq_init_attr)
 162 {
 163         struct ib_srq *srq;
 164
 165         if (!pd->device->create_srq)
 166                 return ERR_PTR(-ENOSYS);
 167
 168         srq = pd->device->create_srq(pd, srq_init_attr, NULL);
 169
 170         if (!IS_ERR(srq)) {
 171                 srq->device        = pd->device;
 172                 srq->pd            = pd;
 173                 srq->uobject       = NULL;
 174                 srq->event_handler = srq_init_attr->event_handler;
 175                 srq->srq_context   = srq_init_attr->srq_context;
 176                 atomic_inc(&pd->usecnt);
 177                 atomic_set(&srq->usecnt, 0);
 178         }
 179
 180         return srq;
 181 }
 182 EXPORT_SYMBOL(ib_create_srq);
 183
 184 int ib_modify_srq(struct ib_srq *srq,
 185                   struct ib_srq_attr *srq_attr,
 186                   enum ib_srq_attr_mask srq_attr_mask)
 187 {
 188         return srq->device->modify_srq(srq, srq_attr, srq_attr_mask);
 189 }
 190 EXPORT_SYMBOL(ib_modify_srq);
 191
 192 int ib_query_srq(struct ib_srq *srq,
 193                  struct ib_srq_attr *srq_attr)
 194 {
 195         return srq->device->query_srq ?
 196                 srq->device->query_srq(srq, srq_attr) : -ENOSYS;
 197 }
 198 EXPORT_SYMBOL(ib_query_srq);
 199
 200 int ib_destroy_srq(struct ib_srq *srq)
 201 {
 202         struct ib_pd *pd;
 203         int ret;
 204
 205         if (atomic_read(&srq->usecnt))
 206                 return -EBUSY;
 207
 208         pd = srq->pd;
 209
 210         ret = srq->device->destroy_srq(srq);
 211         if (!ret)
 212                 atomic_dec(&pd->usecnt);
 213
 214         return ret;
 215 }
 216 EXPORT_SYMBOL(ib_destroy_srq);
 217
 218 /* Queue pairs */
 219
 220 struct ib_qp *ib_create_qp(struct ib_pd *pd,
 221                            struct ib_qp_init_attr *qp_init_attr)
 222 {
 223         struct ib_qp *qp;
 224
 225         qp = pd->device->create_qp(pd, qp_init_attr, NULL);
 226
 227         if (!IS_ERR(qp)) {
 228                 qp->device        = pd->device;
 229                 qp->pd            = pd;
 230                 qp->send_cq       = qp_init_attr->send_cq;
 231                 qp->recv_cq       = qp_init_attr->recv_cq;
 232                 qp->srq           = qp_init_attr->srq;
 233                 qp->uobject       = NULL;
 234                 qp->event_handler = qp_init_attr->event_handler;
 235                 qp->qp_context    = qp_init_attr->qp_context;
 236                 qp->qp_type       = qp_init_attr->qp_type;
 237                 atomic_inc(&pd->usecnt);
 238                 atomic_inc(&qp_init_attr->send_cq->usecnt);
 239                 atomic_inc(&qp_init_attr->recv_cq->usecnt);
 240                 if (qp_init_attr->srq)
 241                         atomic_inc(&qp_init_attr->srq->usecnt);
 242         }
 243
 244         return qp;
 245 }
 246 EXPORT_SYMBOL(ib_create_qp);
 247
 248 static const struct {
 249         int                     valid;
 250         enum ib_qp_attr_mask    req_param[IB_QPT_RAW_ETY + 1];
 251         enum ib_qp_attr_mask    opt_param[IB_QPT_RAW_ETY + 1];
 252 } qp_state_table[IB_QPS_ERR + 1][IB_QPS_ERR + 1] = {
 253         [IB_QPS_RESET] = {
 254                 [IB_QPS_RESET] = { .valid = 1 },
 255                 [IB_QPS_ERR]   = { .valid = 1 },
 256                 [IB_QPS_INIT]  = {
 257                         .valid = 1,
 258                         .req_param = {
 259                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 260                                                 IB_QP_PORT                      |
 261                                                 IB_QP_QKEY),
 262                                 [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
 263                                                 IB_QP_PORT                      |
 264                                                 IB_QP_ACCESS_FLAGS),
 265                                 [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
 266                                                 IB_QP_PORT                      |
 267                                                 IB_QP_ACCESS_FLAGS),
 268                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 269                                                 IB_QP_QKEY),
 270                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 271                                                 IB_QP_QKEY),
 272                         }
 273                 },
 274         },
 275         [IB_QPS_INIT]  = {
 276                 [IB_QPS_RESET] = { .valid = 1 },
 277                 [IB_QPS_ERR] =   { .valid = 1 },
 278                 [IB_QPS_INIT]  = {
 279                         .valid = 1,
 280                         .opt_param = {
 281                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 282                                                 IB_QP_PORT                      |
 283                                                 IB_QP_QKEY),
 284                                 [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
 285                                                 IB_QP_PORT                      |
 286                                                 IB_QP_ACCESS_FLAGS),
 287                                 [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
 288                                                 IB_QP_PORT                      |
 289                                                 IB_QP_ACCESS_FLAGS),
 290                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 291                                                 IB_QP_QKEY),
 292                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 293                                                 IB_QP_QKEY),
 294                         }
 295                 },
 296                 [IB_QPS_RTR]   = {
 297                         .valid = 1,
 298                         .req_param = {
 299                                 [IB_QPT_UC]  = (IB_QP_AV                        |
 300                                                 IB_QP_PATH_MTU                  |
 301                                                 IB_QP_DEST_QPN                  |
 302                                                 IB_QP_RQ_PSN),
 303                                 [IB_QPT_RC]  = (IB_QP_AV                        |
 304                                                 IB_QP_PATH_MTU                  |
 305                                                 IB_QP_DEST_QPN                  |
 306                                                 IB_QP_RQ_PSN                    |
 307                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 308                                                 IB_QP_MIN_RNR_TIMER),
 309                         },
 310                         .opt_param = {
 311                                  [IB_QPT_UD]  = (IB_QP_PKEY_INDEX               |
 312                                                  IB_QP_QKEY),
 313                                  [IB_QPT_UC]  = (IB_QP_ALT_PATH                 |
 314                                                  IB_QP_ACCESS_FLAGS             |
 315                                                  IB_QP_PKEY_INDEX),
 316                                  [IB_QPT_RC]  = (IB_QP_ALT_PATH                 |
 317                                                  IB_QP_ACCESS_FLAGS             |
 318                                                  IB_QP_PKEY_INDEX),
 319                                  [IB_QPT_SMI] = (IB_QP_PKEY_INDEX               |
 320                                                  IB_QP_QKEY),
 321                                  [IB_QPT_GSI] = (IB_QP_PKEY_INDEX               |
 322                                                  IB_QP_QKEY),
 323                          }
 324                 }
 325         },
 326         [IB_QPS_RTR]   = {
 327                 [IB_QPS_RESET] = { .valid = 1 },
 328                 [IB_QPS_ERR] =   { .valid = 1 },
 329                 [IB_QPS_RTS]   = {
 330                         .valid = 1,
 331                         .req_param = {
 332                                 [IB_QPT_UD]  = IB_QP_SQ_PSN,
 333                                 [IB_QPT_UC]  = IB_QP_SQ_PSN,
 334                                 [IB_QPT_RC]  = (IB_QP_TIMEOUT                   |
 335                                                 IB_QP_RETRY_CNT                 |
 336                                                 IB_QP_RNR_RETRY                 |
 337                                                 IB_QP_SQ_PSN                    |
 338                                                 IB_QP_MAX_QP_RD_ATOMIC),
 339                                 [IB_QPT_SMI] = IB_QP_SQ_PSN,
 340                                 [IB_QPT_GSI] = IB_QP_SQ_PSN,
 341                         },
 342                         .opt_param = {
 343                                  [IB_QPT_UD]  = (IB_QP_CUR_STATE                |
 344                                                  IB_QP_QKEY),
 345                                  [IB_QPT_UC]  = (IB_QP_CUR_STATE                |
 346                                                  IB_QP_ALT_PATH                 |
 347                                                  IB_QP_ACCESS_FLAGS             |
 348                                                  IB_QP_PATH_MIG_STATE),
 349                                  [IB_QPT_RC]  = (IB_QP_CUR_STATE                |
 350                                                  IB_QP_ALT_PATH                 |
 351                                                  IB_QP_ACCESS_FLAGS             |
 352                                                  IB_QP_MIN_RNR_TIMER            |
 353                                                  IB_QP_PATH_MIG_STATE),
 354                                  [IB_QPT_SMI] = (IB_QP_CUR_STATE                |
 355                                                  IB_QP_QKEY),
 356                                  [IB_QPT_GSI] = (IB_QP_CUR_STATE                |
 357                                                  IB_QP_QKEY),
 358                          }
 359                 }
 360         },
 361         [IB_QPS_RTS]   = {
 362                 [IB_QPS_RESET] = { .valid = 1 },
 363                 [IB_QPS_ERR] =   { .valid = 1 },
 364                 [IB_QPS_RTS]   = {
 365                         .valid = 1,
 366                         .opt_param = {
 367                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
 368                                                 IB_QP_QKEY),
 369                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
 370                                                 IB_QP_ACCESS_FLAGS              |
 371                                                 IB_QP_ALT_PATH                  |
 372                                                 IB_QP_PATH_MIG_STATE),
 373                                 [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
 374                                                 IB_QP_ACCESS_FLAGS              |
 375                                                 IB_QP_ALT_PATH                  |
 376                                                 IB_QP_PATH_MIG_STATE            |
 377                                                 IB_QP_MIN_RNR_TIMER),
 378                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
 379                                                 IB_QP_QKEY),
 380                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
 381                                                 IB_QP_QKEY),
 382                         }
 383                 },
 384                 [IB_QPS_SQD]   = {
 385                         .valid = 1,
 386                         .opt_param = {
 387                                 [IB_QPT_UD]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 388                                 [IB_QPT_UC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 389                                 [IB_QPT_RC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 390                                 [IB_QPT_SMI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
 391                                 [IB_QPT_GSI] = IB_QP_EN_SQD_ASYNC_NOTIFY
 392                         }
 393                 },
 394         },
 395         [IB_QPS_SQD]   = {
 396                 [IB_QPS_RESET] = { .valid = 1 },
 397                 [IB_QPS_ERR] =   { .valid = 1 },
 398                 [IB_QPS_RTS]   = {
 399                         .valid = 1,
 400                         .opt_param = {
 401                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
 402                                                 IB_QP_QKEY),
 403                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
 404                                                 IB_QP_ALT_PATH                  |
 405                                                 IB_QP_ACCESS_FLAGS              |
 406                                                 IB_QP_PATH_MIG_STATE),
 407                                 [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
 408                                                 IB_QP_ALT_PATH                  |
 409                                                 IB_QP_ACCESS_FLAGS              |
 410                                                 IB_QP_MIN_RNR_TIMER             |
 411                                                 IB_QP_PATH_MIG_STATE),
 412                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
 413                                                 IB_QP_QKEY),
 414                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
 415                                                 IB_QP_QKEY),
 416                         }
 417                 },
 418                 [IB_QPS_SQD]   = {
 419                         .valid = 1,
 420                         .opt_param = {
 421                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 422                                                 IB_QP_QKEY),
 423                                 [IB_QPT_UC]  = (IB_QP_AV                        |
 424                                                 IB_QP_ALT_PATH                  |
 425                                                 IB_QP_ACCESS_FLAGS              |
 426                                                 IB_QP_PKEY_INDEX                |
 427                                                 IB_QP_PATH_MIG_STATE),
 428                                 [IB_QPT_RC]  = (IB_QP_PORT                      |
 429                                                 IB_QP_AV                        |
 430                                                 IB_QP_TIMEOUT                   |
 431                                                 IB_QP_RETRY_CNT                 |
 432                                                 IB_QP_RNR_RETRY                 |
 433                                                 IB_QP_MAX_QP_RD_ATOMIC          |
 434                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 435                                                 IB_QP_ALT_PATH                  |
 436                                                 IB_QP_ACCESS_FLAGS              |
 437                                                 IB_QP_PKEY_INDEX                |
 438                                                 IB_QP_MIN_RNR_TIMER             |
 439                                                 IB_QP_PATH_MIG_STATE),
 440                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 441                                                 IB_QP_QKEY),
 442                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 443                                                 IB_QP_QKEY),
 444                         }
 445                 }
 446         },
 447         [IB_QPS_SQE]   = {
 448                 [IB_QPS_RESET] = { .valid = 1 },
 449                 [IB_QPS_ERR] =   { .valid = 1 },
 450                 [IB_QPS_RTS]   = {
 451                         .valid = 1,
 452                         .opt_param = {
 453                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
 454                                                 IB_QP_QKEY),
 455                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
 456                                                 IB_QP_ACCESS_FLAGS),
 457                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
 458                                                 IB_QP_QKEY),
 459                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
 460                                                 IB_QP_QKEY),
 461                         }
 462                 }
 463         },
 464         [IB_QPS_ERR] = {
 465                 [IB_QPS_RESET] = { .valid = 1 },
 466                 [IB_QPS_ERR] =   { .valid = 1 }
 467         }
 468 };
 469
 470 int ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
 471                        enum ib_qp_type type, enum ib_qp_attr_mask mask)
 472 {
 473         enum ib_qp_attr_mask req_param, opt_param;
 474
 475         if (cur_state  < 0 || cur_state  > IB_QPS_ERR ||
 476             next_state < 0 || next_state > IB_QPS_ERR)
 477                 return 0;
 478
 479         if (mask & IB_QP_CUR_STATE  &&
 480             cur_state != IB_QPS_RTR && cur_state != IB_QPS_RTS &&
 481             cur_state != IB_QPS_SQD && cur_state != IB_QPS_SQE)
 482                 return 0;
 483
 484         if (!qp_state_table[cur_state][next_state].valid)
 485                 return 0;
 486
 487         req_param = qp_state_table[cur_state][next_state].req_param[type];
 488         opt_param = qp_state_table[cur_state][next_state].opt_param[type];
 489
 490         if ((mask & req_param) != req_param)
 491                 return 0;
 492
 493         if (mask & ~(req_param | opt_param | IB_QP_STATE))
 494                 return 0;
 495
 496         return 1;
 497 }
 498 EXPORT_SYMBOL(ib_modify_qp_is_ok);
 499
 500 int ib_modify_qp(struct ib_qp *qp,
 501                  struct ib_qp_attr *qp_attr,
 502                  int qp_attr_mask)
 503 {
 504         return qp->device->modify_qp(qp, qp_attr, qp_attr_mask);
 505 }
 506 EXPORT_SYMBOL(ib_modify_qp);
 507
 508 int ib_query_qp(struct ib_qp *qp,
 509                 struct ib_qp_attr *qp_attr,
 510                 int qp_attr_mask,
 511                 struct ib_qp_init_attr *qp_init_attr)
 512 {
 513         return qp->device->query_qp ?
 514                 qp->device->query_qp(qp, qp_attr, qp_attr_mask, qp_init_attr) :
 515                 -ENOSYS;
 516 }
 517 EXPORT_SYMBOL(ib_query_qp);
 518
 519 int ib_destroy_qp(struct ib_qp *qp)
 520 {
 521         struct ib_pd *pd;
 522         struct ib_cq *scq, *rcq;
 523         struct ib_srq *srq;
 524         int ret;
 525
 526         pd  = qp->pd;
 527         scq = qp->send_cq;
 528         rcq = qp->recv_cq;
 529         srq = qp->srq;
 530
 531         ret = qp->device->destroy_qp(qp);
 532         if (!ret) {
 533                 atomic_dec(&pd->usecnt);
 534                 atomic_dec(&scq->usecnt);
 535                 atomic_dec(&rcq->usecnt);
 536                 if (srq)
 537                         atomic_dec(&srq->usecnt);
 538         }
 539
 540         return ret;
 541 }
 542 EXPORT_SYMBOL(ib_destroy_qp);
 543
 544 /* Completion queues */
 545
 546 struct ib_cq *ib_create_cq(struct ib_device *device,
 547                            ib_comp_handler comp_handler,
 548                            void (*event_handler)(struct ib_event *, void *),
 549                            void *cq_context, int cqe)
 550 {
 551         struct ib_cq *cq;
 552
 553         cq = device->create_cq(device, cqe, NULL, NULL);
 554
 555         if (!IS_ERR(cq)) {
 556                 cq->device        = device;
 557                 cq->uobject       = NULL;
 558                 cq->comp_handler  = comp_handler;
 559                 cq->event_handler = event_handler;
 560                 cq->cq_context    = cq_context;
 561                 atomic_set(&cq->usecnt, 0);
 562         }
 563
 564         return cq;
 565 }
 566 EXPORT_SYMBOL(ib_create_cq);
 567
 568 int ib_destroy_cq(struct ib_cq *cq)
 569 {
 570         if (atomic_read(&cq->usecnt))
 571                 return -EBUSY;
 572
 573         return cq->device->destroy_cq(cq);
 574 }
 575 EXPORT_SYMBOL(ib_destroy_cq);
 576
 577 int ib_resize_cq(struct ib_cq *cq, int cqe)
 578 {
 579         return cq->device->resize_cq ?
 580                 cq->device->resize_cq(cq, cqe, NULL) : -ENOSYS;
 581 }
 582 EXPORT_SYMBOL(ib_resize_cq);
 583
 584 /* Memory regions */
 585
 586 struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags)
 587 {
 588         struct ib_mr *mr;
 589
 590         mr = pd->device->get_dma_mr(pd, mr_access_flags);
 591
 592         if (!IS_ERR(mr)) {
 593                 mr->device  = pd->device;
 594                 mr->pd      = pd;
 595                 mr->uobject = NULL;
 596                 atomic_inc(&pd->usecnt);
 597                 atomic_set(&mr->usecnt, 0);
 598         }
 599
 600         return mr;
 601 }
 602 EXPORT_SYMBOL(ib_get_dma_mr);
 603
 604 struct ib_mr *ib_reg_phys_mr(struct ib_pd *pd,
 605                              struct ib_phys_buf *phys_buf_array,
 606                              int num_phys_buf,
 607                              int mr_access_flags,
 608                              u64 *iova_start)
 609 {
 610         struct ib_mr *mr;
 611
 612         mr = pd->device->reg_phys_mr(pd, phys_buf_array, num_phys_buf,
 613                                      mr_access_flags, iova_start);
 614
 615         if (!IS_ERR(mr)) {
 616                 mr->device  = pd->device;
 617                 mr->pd      = pd;
 618                 mr->uobject = NULL;
 619                 atomic_inc(&pd->usecnt);
 620                 atomic_set(&mr->usecnt, 0);
 621         }
 622
 623         return mr;
 624 }
 625 EXPORT_SYMBOL(ib_reg_phys_mr);
 626
 627 int ib_rereg_phys_mr(struct ib_mr *mr,
 628                      int mr_rereg_mask,
 629                      struct ib_pd *pd,
 630                      struct ib_phys_buf *phys_buf_array,
 631                      int num_phys_buf,
 632                      int mr_access_flags,
 633                      u64 *iova_start)
 634 {
 635         struct ib_pd *old_pd;
 636         int ret;
 637
 638         if (!mr->device->rereg_phys_mr)
 639                 return -ENOSYS;
 640
 641         if (atomic_read(&mr->usecnt))
 642                 return -EBUSY;
 643
 644         old_pd = mr->pd;
 645
 646         ret = mr->device->rereg_phys_mr(mr, mr_rereg_mask, pd,
 647                                         phys_buf_array, num_phys_buf,
 648                                         mr_access_flags, iova_start);
 649
 650         if (!ret && (mr_rereg_mask & IB_MR_REREG_PD)) {
 651                 atomic_dec(&old_pd->usecnt);
 652                 atomic_inc(&pd->usecnt);
 653         }
 654
 655         return ret;
 656 }
 657 EXPORT_SYMBOL(ib_rereg_phys_mr);
 658
 659 int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr)
 660 {
 661         return mr->device->query_mr ?
 662                 mr->device->query_mr(mr, mr_attr) : -ENOSYS;
 663 }
 664 EXPORT_SYMBOL(ib_query_mr);
 665
 666 int ib_dereg_mr(struct ib_mr *mr)
 667 {
 668         struct ib_pd *pd;
 669         int ret;
 670
 671         if (atomic_read(&mr->usecnt))
 672                 return -EBUSY;
 673
 674         pd = mr->pd;
 675         ret = mr->device->dereg_mr(mr);
 676         if (!ret)
 677                 atomic_dec(&pd->usecnt);
 678
 679         return ret;
 680 }
 681 EXPORT_SYMBOL(ib_dereg_mr);
 682
 683 /* Memory windows */
 684
 685 struct ib_mw *ib_alloc_mw(struct ib_pd *pd)
 686 {
 687         struct ib_mw *mw;
 688
 689         if (!pd->device->alloc_mw)
 690                 return ERR_PTR(-ENOSYS);
 691
 692         mw = pd->device->alloc_mw(pd);
 693         if (!IS_ERR(mw)) {
 694                 mw->device  = pd->device;
 695                 mw->pd      = pd;
 696                 mw->uobject = NULL;
 697                 atomic_inc(&pd->usecnt);
 698         }
 699
 700         return mw;
 701 }
 702 EXPORT_SYMBOL(ib_alloc_mw);
 703
 704 int ib_dealloc_mw(struct ib_mw *mw)
 705 {
 706         struct ib_pd *pd;
 707         int ret;
 708
 709         pd = mw->pd;
 710         ret = mw->device->dealloc_mw(mw);
 711         if (!ret)
 712                 atomic_dec(&pd->usecnt);
 713
 714         return ret;
 715 }
 716 EXPORT_SYMBOL(ib_dealloc_mw);
 717
 718 /* "Fast" memory regions */
 719
 720 struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
 721                             int mr_access_flags,
 722                             struct ib_fmr_attr *fmr_attr)
 723 {
 724         struct ib_fmr *fmr;
 725
 726         if (!pd->device->alloc_fmr)
 727                 return ERR_PTR(-ENOSYS);
 728
 729         fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr);
 730         if (!IS_ERR(fmr)) {
 731                 fmr->device = pd->device;
 732                 fmr->pd     = pd;
 733                 atomic_inc(&pd->usecnt);
 734         }
 735
 736         return fmr;
 737 }
 738 EXPORT_SYMBOL(ib_alloc_fmr);
 739
 740 int ib_unmap_fmr(struct list_head *fmr_list)
 741 {
 742         struct ib_fmr *fmr;
 743
 744         if (list_empty(fmr_list))
 745                 return 0;
 746
 747         fmr = list_entry(fmr_list->next, struct ib_fmr, list);
 748         return fmr->device->unmap_fmr(fmr_list);
 749 }
 750 EXPORT_SYMBOL(ib_unmap_fmr);
 751
 752 int ib_dealloc_fmr(struct ib_fmr *fmr)
 753 {
 754         struct ib_pd *pd;
 755         int ret;
 756
 757         pd = fmr->pd;
 758         ret = fmr->device->dealloc_fmr(fmr);
 759         if (!ret)
 760                 atomic_dec(&pd->usecnt);
 761
 762         return ret;
 763 }
 764 EXPORT_SYMBOL(ib_dealloc_fmr);
 765
 766 /* Multicast groups */
 767
 768 int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
 769 {
 770         if (!qp->device->attach_mcast)
 771                 return -ENOSYS;
 772         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
 773                 return -EINVAL;
 774
 775         return qp->device->attach_mcast(qp, gid, lid);
 776 }
 777 EXPORT_SYMBOL(ib_attach_mcast);
 778
 779 int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
 780 {
 781         if (!qp->device->detach_mcast)
 782                 return -ENOSYS;
 783         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
 784                 return -EINVAL;
 785
 786         return qp->device->detach_mcast(qp, gid, lid);
 787 }
 788 EXPORT_SYMBOL(ib_detach_mcast);