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 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->dgid;
 111
 112                 ret = ib_find_cached_gid(pd->device, &grh->sgid, &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 int ib_modify_qp(struct ib_qp *qp,
 249                  struct ib_qp_attr *qp_attr,
 250                  int qp_attr_mask)
 251 {
 252         return qp->device->modify_qp(qp, qp_attr, qp_attr_mask);
 253 }
 254 EXPORT_SYMBOL(ib_modify_qp);
 255
 256 int ib_query_qp(struct ib_qp *qp,
 257                 struct ib_qp_attr *qp_attr,
 258                 int qp_attr_mask,
 259                 struct ib_qp_init_attr *qp_init_attr)
 260 {
 261         return qp->device->query_qp ?
 262                 qp->device->query_qp(qp, qp_attr, qp_attr_mask, qp_init_attr) :
 263                 -ENOSYS;
 264 }
 265 EXPORT_SYMBOL(ib_query_qp);
 266
 267 int ib_destroy_qp(struct ib_qp *qp)
 268 {
 269         struct ib_pd *pd;
 270         struct ib_cq *scq, *rcq;
 271         struct ib_srq *srq;
 272         int ret;
 273
 274         pd  = qp->pd;
 275         scq = qp->send_cq;
 276         rcq = qp->recv_cq;
 277         srq = qp->srq;
 278
 279         ret = qp->device->destroy_qp(qp);
 280         if (!ret) {
 281                 atomic_dec(&pd->usecnt);
 282                 atomic_dec(&scq->usecnt);
 283                 atomic_dec(&rcq->usecnt);
 284                 if (srq)
 285                         atomic_dec(&srq->usecnt);
 286         }
 287
 288         return ret;
 289 }
 290 EXPORT_SYMBOL(ib_destroy_qp);
 291
 292 /* Completion queues */
 293
 294 struct ib_cq *ib_create_cq(struct ib_device *device,
 295                            ib_comp_handler comp_handler,
 296                            void (*event_handler)(struct ib_event *, void *),
 297                            void *cq_context, int cqe)
 298 {
 299         struct ib_cq *cq;
 300
 301         cq = device->create_cq(device, cqe, NULL, NULL);
 302
 303         if (!IS_ERR(cq)) {
 304                 cq->device        = device;
 305                 cq->uobject       = NULL;
 306                 cq->comp_handler  = comp_handler;
 307                 cq->event_handler = event_handler;
 308                 cq->cq_context    = cq_context;
 309                 atomic_set(&cq->usecnt, 0);
 310         }
 311
 312         return cq;
 313 }
 314 EXPORT_SYMBOL(ib_create_cq);
 315
 316 int ib_destroy_cq(struct ib_cq *cq)
 317 {
 318         if (atomic_read(&cq->usecnt))
 319                 return -EBUSY;
 320
 321         return cq->device->destroy_cq(cq);
 322 }
 323 EXPORT_SYMBOL(ib_destroy_cq);
 324
 325 int ib_resize_cq(struct ib_cq *cq,
 326                  int           cqe)
 327 {
 328         int ret;
 329
 330         if (!cq->device->resize_cq)
 331                 return -ENOSYS;
 332
 333         ret = cq->device->resize_cq(cq, &cqe);
 334         if (!ret)
 335                 cq->cqe = cqe;
 336
 337         return ret;
 338 }
 339 EXPORT_SYMBOL(ib_resize_cq);
 340
 341 /* Memory regions */
 342
 343 struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags)
 344 {
 345         struct ib_mr *mr;
 346
 347         mr = pd->device->get_dma_mr(pd, mr_access_flags);
 348
 349         if (!IS_ERR(mr)) {
 350                 mr->device  = pd->device;
 351                 mr->pd      = pd;
 352                 mr->uobject = NULL;
 353                 atomic_inc(&pd->usecnt);
 354                 atomic_set(&mr->usecnt, 0);
 355         }
 356
 357         return mr;
 358 }
 359 EXPORT_SYMBOL(ib_get_dma_mr);
 360
 361 struct ib_mr *ib_reg_phys_mr(struct ib_pd *pd,
 362                              struct ib_phys_buf *phys_buf_array,
 363                              int num_phys_buf,
 364                              int mr_access_flags,
 365                              u64 *iova_start)
 366 {
 367         struct ib_mr *mr;
 368
 369         mr = pd->device->reg_phys_mr(pd, phys_buf_array, num_phys_buf,
 370                                      mr_access_flags, iova_start);
 371
 372         if (!IS_ERR(mr)) {
 373                 mr->device  = pd->device;
 374                 mr->pd      = pd;
 375                 mr->uobject = NULL;
 376                 atomic_inc(&pd->usecnt);
 377                 atomic_set(&mr->usecnt, 0);
 378         }
 379
 380         return mr;
 381 }
 382 EXPORT_SYMBOL(ib_reg_phys_mr);
 383
 384 int ib_rereg_phys_mr(struct ib_mr *mr,
 385                      int mr_rereg_mask,
 386                      struct ib_pd *pd,
 387                      struct ib_phys_buf *phys_buf_array,
 388                      int num_phys_buf,
 389                      int mr_access_flags,
 390                      u64 *iova_start)
 391 {
 392         struct ib_pd *old_pd;
 393         int ret;
 394
 395         if (!mr->device->rereg_phys_mr)
 396                 return -ENOSYS;
 397
 398         if (atomic_read(&mr->usecnt))
 399                 return -EBUSY;
 400
 401         old_pd = mr->pd;
 402
 403         ret = mr->device->rereg_phys_mr(mr, mr_rereg_mask, pd,
 404                                         phys_buf_array, num_phys_buf,
 405                                         mr_access_flags, iova_start);
 406
 407         if (!ret && (mr_rereg_mask & IB_MR_REREG_PD)) {
 408                 atomic_dec(&old_pd->usecnt);
 409                 atomic_inc(&pd->usecnt);
 410         }
 411
 412         return ret;
 413 }
 414 EXPORT_SYMBOL(ib_rereg_phys_mr);
 415
 416 int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr)
 417 {
 418         return mr->device->query_mr ?
 419                 mr->device->query_mr(mr, mr_attr) : -ENOSYS;
 420 }
 421 EXPORT_SYMBOL(ib_query_mr);
 422
 423 int ib_dereg_mr(struct ib_mr *mr)
 424 {
 425         struct ib_pd *pd;
 426         int ret;
 427
 428         if (atomic_read(&mr->usecnt))
 429                 return -EBUSY;
 430
 431         pd = mr->pd;
 432         ret = mr->device->dereg_mr(mr);
 433         if (!ret)
 434                 atomic_dec(&pd->usecnt);
 435
 436         return ret;
 437 }
 438 EXPORT_SYMBOL(ib_dereg_mr);
 439
 440 /* Memory windows */
 441
 442 struct ib_mw *ib_alloc_mw(struct ib_pd *pd)
 443 {
 444         struct ib_mw *mw;
 445
 446         if (!pd->device->alloc_mw)
 447                 return ERR_PTR(-ENOSYS);
 448
 449         mw = pd->device->alloc_mw(pd);
 450         if (!IS_ERR(mw)) {
 451                 mw->device  = pd->device;
 452                 mw->pd      = pd;
 453                 mw->uobject = NULL;
 454                 atomic_inc(&pd->usecnt);
 455         }
 456
 457         return mw;
 458 }
 459 EXPORT_SYMBOL(ib_alloc_mw);
 460
 461 int ib_dealloc_mw(struct ib_mw *mw)
 462 {
 463         struct ib_pd *pd;
 464         int ret;
 465
 466         pd = mw->pd;
 467         ret = mw->device->dealloc_mw(mw);
 468         if (!ret)
 469                 atomic_dec(&pd->usecnt);
 470
 471         return ret;
 472 }
 473 EXPORT_SYMBOL(ib_dealloc_mw);
 474
 475 /* "Fast" memory regions */
 476
 477 struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
 478                             int mr_access_flags,
 479                             struct ib_fmr_attr *fmr_attr)
 480 {
 481         struct ib_fmr *fmr;
 482
 483         if (!pd->device->alloc_fmr)
 484                 return ERR_PTR(-ENOSYS);
 485
 486         fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr);
 487         if (!IS_ERR(fmr)) {
 488                 fmr->device = pd->device;
 489                 fmr->pd     = pd;
 490                 atomic_inc(&pd->usecnt);
 491         }
 492
 493         return fmr;
 494 }
 495 EXPORT_SYMBOL(ib_alloc_fmr);
 496
 497 int ib_unmap_fmr(struct list_head *fmr_list)
 498 {
 499         struct ib_fmr *fmr;
 500
 501         if (list_empty(fmr_list))
 502                 return 0;
 503
 504         fmr = list_entry(fmr_list->next, struct ib_fmr, list);
 505         return fmr->device->unmap_fmr(fmr_list);
 506 }
 507 EXPORT_SYMBOL(ib_unmap_fmr);
 508
 509 int ib_dealloc_fmr(struct ib_fmr *fmr)
 510 {
 511         struct ib_pd *pd;
 512         int ret;
 513
 514         pd = fmr->pd;
 515         ret = fmr->device->dealloc_fmr(fmr);
 516         if (!ret)
 517                 atomic_dec(&pd->usecnt);
 518
 519         return ret;
 520 }
 521 EXPORT_SYMBOL(ib_dealloc_fmr);
 522
 523 /* Multicast groups */
 524
 525 int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
 526 {
 527         if (!qp->device->attach_mcast)
 528                 return -ENOSYS;
 529         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
 530                 return -EINVAL;
 531
 532         return qp->device->attach_mcast(qp, gid, lid);
 533 }
 534 EXPORT_SYMBOL(ib_attach_mcast);
 535
 536 int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
 537 {
 538         if (!qp->device->detach_mcast)
 539                 return -ENOSYS;
 540         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
 541                 return -EINVAL;
 542
 543         return qp->device->detach_mcast(qp, gid, lid);
 544 }
 545 EXPORT_SYMBOL(ib_detach_mcast);