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
  44 #include <ib_verbs.h>
  45 #include <ib_cache.h>
  46
  47 /* Protection domains */
  48
  49 struct ib_pd *ib_alloc_pd(struct ib_device *device)
  50 {
  51         struct ib_pd *pd;
  52
  53         pd = device->alloc_pd(device, NULL, NULL);
  54
  55         if (!IS_ERR(pd)) {
  56                 pd->device  = device;
  57                 pd->uobject = NULL;
  58                 atomic_set(&pd->usecnt, 0);
  59         }
  60
  61         return pd;
  62 }
  63 EXPORT_SYMBOL(ib_alloc_pd);
  64
  65 int ib_dealloc_pd(struct ib_pd *pd)
  66 {
  67         if (atomic_read(&pd->usecnt))
  68                 return -EBUSY;
  69
  70         return pd->device->dealloc_pd(pd);
  71 }
  72 EXPORT_SYMBOL(ib_dealloc_pd);
  73
  74 /* Address handles */
  75
  76 struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
  77 {
  78         struct ib_ah *ah;
  79
  80         ah = pd->device->create_ah(pd, ah_attr);
  81
  82         if (!IS_ERR(ah)) {
  83                 ah->device  = pd->device;
  84                 ah->pd      = pd;
  85                 ah->uobject = NULL;
  86                 atomic_inc(&pd->usecnt);
  87         }
  88
  89         return ah;
  90 }
  91 EXPORT_SYMBOL(ib_create_ah);
  92
  93 struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, struct ib_wc *wc,
  94                                    struct ib_grh *grh, u8 port_num)
  95 {
  96         struct ib_ah_attr ah_attr;
  97         u32 flow_class;
  98         u16 gid_index;
  99         int ret;
 100
 101         memset(&ah_attr, 0, sizeof ah_attr);
 102         ah_attr.dlid = wc->slid;
 103         ah_attr.sl = wc->sl;
 104         ah_attr.src_path_bits = wc->dlid_path_bits;
 105         ah_attr.port_num = port_num;
 106
 107         if (wc->wc_flags & IB_WC_GRH) {
 108                 ah_attr.ah_flags = IB_AH_GRH;
 109                 ah_attr.grh.dgid = grh->dgid;
 110
 111                 ret = ib_find_cached_gid(pd->device, &grh->sgid, &port_num,
 112                                          &gid_index);
 113                 if (ret)
 114                         return ERR_PTR(ret);
 115
 116                 ah_attr.grh.sgid_index = (u8) gid_index;
 117                 flow_class = be32_to_cpu(grh->version_tclass_flow);
 118                 ah_attr.grh.flow_label = flow_class & 0xFFFFF;
 119                 ah_attr.grh.traffic_class = (flow_class >> 20) & 0xFF;
 120                 ah_attr.grh.hop_limit = grh->hop_limit;
 121         }
 122
 123         return ib_create_ah(pd, &ah_attr);
 124 }
 125 EXPORT_SYMBOL(ib_create_ah_from_wc);
 126
 127 int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 128 {
 129         return ah->device->modify_ah ?
 130                 ah->device->modify_ah(ah, ah_attr) :
 131                 -ENOSYS;
 132 }
 133 EXPORT_SYMBOL(ib_modify_ah);
 134
 135 int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 136 {
 137         return ah->device->query_ah ?
 138                 ah->device->query_ah(ah, ah_attr) :
 139                 -ENOSYS;
 140 }
 141 EXPORT_SYMBOL(ib_query_ah);
 142
 143 int ib_destroy_ah(struct ib_ah *ah)
 144 {
 145         struct ib_pd *pd;
 146         int ret;
 147
 148         pd = ah->pd;
 149         ret = ah->device->destroy_ah(ah);
 150         if (!ret)
 151                 atomic_dec(&pd->usecnt);
 152
 153         return ret;
 154 }
 155 EXPORT_SYMBOL(ib_destroy_ah);
 156
 157 /* Queue pairs */
 158
 159 struct ib_qp *ib_create_qp(struct ib_pd *pd,
 160                            struct ib_qp_init_attr *qp_init_attr)
 161 {
 162         struct ib_qp *qp;
 163
 164         qp = pd->device->create_qp(pd, qp_init_attr, NULL);
 165
 166         if (!IS_ERR(qp)) {
 167                 qp->device        = pd->device;
 168                 qp->pd            = pd;
 169                 qp->send_cq       = qp_init_attr->send_cq;
 170                 qp->recv_cq       = qp_init_attr->recv_cq;
 171                 qp->srq           = qp_init_attr->srq;
 172                 qp->uobject       = NULL;
 173                 qp->event_handler = qp_init_attr->event_handler;
 174                 qp->qp_context    = qp_init_attr->qp_context;
 175                 qp->qp_type       = qp_init_attr->qp_type;
 176                 atomic_inc(&pd->usecnt);
 177                 atomic_inc(&qp_init_attr->send_cq->usecnt);
 178                 atomic_inc(&qp_init_attr->recv_cq->usecnt);
 179                 if (qp_init_attr->srq)
 180                         atomic_inc(&qp_init_attr->srq->usecnt);
 181         }
 182
 183         return qp;
 184 }
 185 EXPORT_SYMBOL(ib_create_qp);
 186
 187 int ib_modify_qp(struct ib_qp *qp,
 188                  struct ib_qp_attr *qp_attr,
 189                  int qp_attr_mask)
 190 {
 191         return qp->device->modify_qp(qp, qp_attr, qp_attr_mask);
 192 }
 193 EXPORT_SYMBOL(ib_modify_qp);
 194
 195 int ib_query_qp(struct ib_qp *qp,
 196                 struct ib_qp_attr *qp_attr,
 197                 int qp_attr_mask,
 198                 struct ib_qp_init_attr *qp_init_attr)
 199 {
 200         return qp->device->query_qp ?
 201                 qp->device->query_qp(qp, qp_attr, qp_attr_mask, qp_init_attr) :
 202                 -ENOSYS;
 203 }
 204 EXPORT_SYMBOL(ib_query_qp);
 205
 206 int ib_destroy_qp(struct ib_qp *qp)
 207 {
 208         struct ib_pd *pd;
 209         struct ib_cq *scq, *rcq;
 210         struct ib_srq *srq;
 211         int ret;
 212
 213         pd  = qp->pd;
 214         scq = qp->send_cq;
 215         rcq = qp->recv_cq;
 216         srq = qp->srq;
 217
 218         ret = qp->device->destroy_qp(qp);
 219         if (!ret) {
 220                 atomic_dec(&pd->usecnt);
 221                 atomic_dec(&scq->usecnt);
 222                 atomic_dec(&rcq->usecnt);
 223                 if (srq)
 224                         atomic_dec(&srq->usecnt);
 225         }
 226
 227         return ret;
 228 }
 229 EXPORT_SYMBOL(ib_destroy_qp);
 230
 231 /* Completion queues */
 232
 233 struct ib_cq *ib_create_cq(struct ib_device *device,
 234                            ib_comp_handler comp_handler,
 235                            void (*event_handler)(struct ib_event *, void *),
 236                            void *cq_context, int cqe)
 237 {
 238         struct ib_cq *cq;
 239
 240         cq = device->create_cq(device, cqe, NULL, NULL);
 241
 242         if (!IS_ERR(cq)) {
 243                 cq->device        = device;
 244                 cq->uobject       = NULL;
 245                 cq->comp_handler  = comp_handler;
 246                 cq->event_handler = event_handler;
 247                 cq->cq_context    = cq_context;
 248                 atomic_set(&cq->usecnt, 0);
 249         }
 250
 251         return cq;
 252 }
 253 EXPORT_SYMBOL(ib_create_cq);
 254
 255 int ib_destroy_cq(struct ib_cq *cq)
 256 {
 257         if (atomic_read(&cq->usecnt))
 258                 return -EBUSY;
 259
 260         return cq->device->destroy_cq(cq);
 261 }
 262 EXPORT_SYMBOL(ib_destroy_cq);
 263
 264 int ib_resize_cq(struct ib_cq *cq,
 265                  int           cqe)
 266 {
 267         int ret;
 268
 269         if (!cq->device->resize_cq)
 270                 return -ENOSYS;
 271
 272         ret = cq->device->resize_cq(cq, &cqe);
 273         if (!ret)
 274                 cq->cqe = cqe;
 275
 276         return ret;
 277 }
 278 EXPORT_SYMBOL(ib_resize_cq);
 279
 280 /* Memory regions */
 281
 282 struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags)
 283 {
 284         struct ib_mr *mr;
 285
 286         mr = pd->device->get_dma_mr(pd, mr_access_flags);
 287
 288         if (!IS_ERR(mr)) {
 289                 mr->device  = pd->device;
 290                 mr->pd      = pd;
 291                 mr->uobject = NULL;
 292                 atomic_inc(&pd->usecnt);
 293                 atomic_set(&mr->usecnt, 0);
 294         }
 295
 296         return mr;
 297 }
 298 EXPORT_SYMBOL(ib_get_dma_mr);
 299
 300 struct ib_mr *ib_reg_phys_mr(struct ib_pd *pd,
 301                              struct ib_phys_buf *phys_buf_array,
 302                              int num_phys_buf,
 303                              int mr_access_flags,
 304                              u64 *iova_start)
 305 {
 306         struct ib_mr *mr;
 307
 308         mr = pd->device->reg_phys_mr(pd, phys_buf_array, num_phys_buf,
 309                                      mr_access_flags, iova_start);
 310
 311         if (!IS_ERR(mr)) {
 312                 mr->device  = pd->device;
 313                 mr->pd      = pd;
 314                 mr->uobject = NULL;
 315                 atomic_inc(&pd->usecnt);
 316                 atomic_set(&mr->usecnt, 0);
 317         }
 318
 319         return mr;
 320 }
 321 EXPORT_SYMBOL(ib_reg_phys_mr);
 322
 323 int ib_rereg_phys_mr(struct ib_mr *mr,
 324                      int mr_rereg_mask,
 325                      struct ib_pd *pd,
 326                      struct ib_phys_buf *phys_buf_array,
 327                      int num_phys_buf,
 328                      int mr_access_flags,
 329                      u64 *iova_start)
 330 {
 331         struct ib_pd *old_pd;
 332         int ret;
 333
 334         if (!mr->device->rereg_phys_mr)
 335                 return -ENOSYS;
 336
 337         if (atomic_read(&mr->usecnt))
 338                 return -EBUSY;
 339
 340         old_pd = mr->pd;
 341
 342         ret = mr->device->rereg_phys_mr(mr, mr_rereg_mask, pd,
 343                                         phys_buf_array, num_phys_buf,
 344                                         mr_access_flags, iova_start);
 345
 346         if (!ret && (mr_rereg_mask & IB_MR_REREG_PD)) {
 347                 atomic_dec(&old_pd->usecnt);
 348                 atomic_inc(&pd->usecnt);
 349         }
 350
 351         return ret;
 352 }
 353 EXPORT_SYMBOL(ib_rereg_phys_mr);
 354
 355 int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr)
 356 {
 357         return mr->device->query_mr ?
 358                 mr->device->query_mr(mr, mr_attr) : -ENOSYS;
 359 }
 360 EXPORT_SYMBOL(ib_query_mr);
 361
 362 int ib_dereg_mr(struct ib_mr *mr)
 363 {
 364         struct ib_pd *pd;
 365         int ret;
 366
 367         if (atomic_read(&mr->usecnt))
 368                 return -EBUSY;
 369
 370         pd = mr->pd;
 371         ret = mr->device->dereg_mr(mr);
 372         if (!ret)
 373                 atomic_dec(&pd->usecnt);
 374
 375         return ret;
 376 }
 377 EXPORT_SYMBOL(ib_dereg_mr);
 378
 379 /* Memory windows */
 380
 381 struct ib_mw *ib_alloc_mw(struct ib_pd *pd)
 382 {
 383         struct ib_mw *mw;
 384
 385         if (!pd->device->alloc_mw)
 386                 return ERR_PTR(-ENOSYS);
 387
 388         mw = pd->device->alloc_mw(pd);
 389         if (!IS_ERR(mw)) {
 390                 mw->device  = pd->device;
 391                 mw->pd      = pd;
 392                 mw->uobject = NULL;
 393                 atomic_inc(&pd->usecnt);
 394         }
 395
 396         return mw;
 397 }
 398 EXPORT_SYMBOL(ib_alloc_mw);
 399
 400 int ib_dealloc_mw(struct ib_mw *mw)
 401 {
 402         struct ib_pd *pd;
 403         int ret;
 404
 405         pd = mw->pd;
 406         ret = mw->device->dealloc_mw(mw);
 407         if (!ret)
 408                 atomic_dec(&pd->usecnt);
 409
 410         return ret;
 411 }
 412 EXPORT_SYMBOL(ib_dealloc_mw);
 413
 414 /* "Fast" memory regions */
 415
 416 struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
 417                             int mr_access_flags,
 418                             struct ib_fmr_attr *fmr_attr)
 419 {
 420         struct ib_fmr *fmr;
 421
 422         if (!pd->device->alloc_fmr)
 423                 return ERR_PTR(-ENOSYS);
 424
 425         fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr);
 426         if (!IS_ERR(fmr)) {
 427                 fmr->device = pd->device;
 428                 fmr->pd     = pd;
 429                 atomic_inc(&pd->usecnt);
 430         }
 431
 432         return fmr;
 433 }
 434 EXPORT_SYMBOL(ib_alloc_fmr);
 435
 436 int ib_unmap_fmr(struct list_head *fmr_list)
 437 {
 438         struct ib_fmr *fmr;
 439
 440         if (list_empty(fmr_list))
 441                 return 0;
 442
 443         fmr = list_entry(fmr_list->next, struct ib_fmr, list);
 444         return fmr->device->unmap_fmr(fmr_list);
 445 }
 446 EXPORT_SYMBOL(ib_unmap_fmr);
 447
 448 int ib_dealloc_fmr(struct ib_fmr *fmr)
 449 {
 450         struct ib_pd *pd;
 451         int ret;
 452
 453         pd = fmr->pd;
 454         ret = fmr->device->dealloc_fmr(fmr);
 455         if (!ret)
 456                 atomic_dec(&pd->usecnt);
 457
 458         return ret;
 459 }
 460 EXPORT_SYMBOL(ib_dealloc_fmr);
 461
 462 /* Multicast groups */
 463
 464 int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
 465 {
 466         return qp->device->attach_mcast ?
 467                 qp->device->attach_mcast(qp, gid, lid) :
 468                 -ENOSYS;
 469 }
 470 EXPORT_SYMBOL(ib_attach_mcast);
 471
 472 int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
 473 {
 474         return qp->device->detach_mcast ?
 475                 qp->device->detach_mcast(qp, gid, lid) :
 476                 -ENOSYS;
 477 }
 478 EXPORT_SYMBOL(ib_detach_mcast);