git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/hw/mthca/mthca_srq.c

   1 /*
   2  * Copyright (c) 2005 Cisco Systems. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * $Id: mthca_srq.c 3047 2005-08-10 03:59:35Z roland $
  33  */
  34
  35 #include <linux/slab.h>
  36 #include <linux/string.h>
  37
  38 #include "mthca_dev.h"
  39 #include "mthca_cmd.h"
  40 #include "mthca_memfree.h"
  41 #include "mthca_wqe.h"
  42
  43 enum {
  44         MTHCA_MAX_DIRECT_SRQ_SIZE = 4 * PAGE_SIZE
  45 };
  46
  47 struct mthca_tavor_srq_context {
  48         __be64 wqe_base_ds;     /* low 6 bits is descriptor size */
  49         __be32 state_pd;
  50         __be32 lkey;
  51         __be32 uar;
  52         __be32 wqe_cnt;
  53         u32    reserved[2];
  54 };
  55
  56 struct mthca_arbel_srq_context {
  57         __be32 state_logsize_srqn;
  58         __be32 lkey;
  59         __be32 db_index;
  60         __be32 logstride_usrpage;
  61         __be64 wqe_base;
  62         __be32 eq_pd;
  63         __be16 limit_watermark;
  64         __be16 wqe_cnt;
  65         u16    reserved1;
  66         __be16 wqe_counter;
  67         u32    reserved2[3];
  68 };
  69
  70 static void *get_wqe(struct mthca_srq *srq, int n)
  71 {
  72         if (srq->is_direct)
  73                 return srq->queue.direct.buf + (n << srq->wqe_shift);
  74         else
  75                 return srq->queue.page_list[(n << srq->wqe_shift) >> PAGE_SHIFT].buf +
  76                         ((n << srq->wqe_shift) & (PAGE_SIZE - 1));
  77 }
  78
  79 /*
  80  * Return a pointer to the location within a WQE that we're using as a
  81  * link when the WQE is in the free list.  We use the imm field
  82  * because in the Tavor case, posting a WQE may overwrite the next
  83  * segment of the previous WQE, but a receive WQE will never touch the
  84  * imm field.  This avoids corrupting our free list if the previous
  85  * WQE has already completed and been put on the free list when we
  86  * post the next WQE.
  87  */
  88 static inline int *wqe_to_link(void *wqe)
  89 {
  90         return (int *) (wqe + offsetof(struct mthca_next_seg, imm));
  91 }
  92
  93 static void mthca_tavor_init_srq_context(struct mthca_dev *dev,
  94                                          struct mthca_pd *pd,
  95                                          struct mthca_srq *srq,
  96                                          struct mthca_tavor_srq_context *context)
  97 {
  98         memset(context, 0, sizeof *context);
  99
 100         context->wqe_base_ds = cpu_to_be64(1 << (srq->wqe_shift - 4));
 101         context->state_pd    = cpu_to_be32(pd->pd_num);
 102         context->lkey        = cpu_to_be32(srq->mr.ibmr.lkey);
 103
 104         if (pd->ibpd.uobject)
 105                 context->uar =
 106                         cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index);
 107         else
 108                 context->uar = cpu_to_be32(dev->driver_uar.index);
 109 }
 110
 111 static void mthca_arbel_init_srq_context(struct mthca_dev *dev,
 112                                          struct mthca_pd *pd,
 113                                          struct mthca_srq *srq,
 114                                          struct mthca_arbel_srq_context *context)
 115 {
 116         int logsize;
 117
 118         memset(context, 0, sizeof *context);
 119
 120         logsize = long_log2(srq->max) + srq->wqe_shift;
 121         context->state_logsize_srqn = cpu_to_be32(logsize << 24 | srq->srqn);
 122         context->lkey = cpu_to_be32(srq->mr.ibmr.lkey);
 123         context->db_index = cpu_to_be32(srq->db_index);
 124         context->logstride_usrpage = cpu_to_be32((srq->wqe_shift - 4) << 29);
 125         if (pd->ibpd.uobject)
 126                 context->logstride_usrpage |=
 127                         cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index);
 128         else
 129                 context->logstride_usrpage |= cpu_to_be32(dev->driver_uar.index);
 130         context->eq_pd = cpu_to_be32(MTHCA_EQ_ASYNC << 24 | pd->pd_num);
 131 }
 132
 133 static void mthca_free_srq_buf(struct mthca_dev *dev, struct mthca_srq *srq)
 134 {
 135         mthca_buf_free(dev, srq->max << srq->wqe_shift, &srq->queue,
 136                        srq->is_direct, &srq->mr);
 137         kfree(srq->wrid);
 138 }
 139
 140 static int mthca_alloc_srq_buf(struct mthca_dev *dev, struct mthca_pd *pd,
 141                                struct mthca_srq *srq)
 142 {
 143         struct mthca_data_seg *scatter;
 144         void *wqe;
 145         int err;
 146         int i;
 147
 148         if (pd->ibpd.uobject)
 149                 return 0;
 150
 151         srq->wrid = kmalloc(srq->max * sizeof (u64), GFP_KERNEL);
 152         if (!srq->wrid)
 153                 return -ENOMEM;
 154
 155         err = mthca_buf_alloc(dev, srq->max << srq->wqe_shift,
 156                               MTHCA_MAX_DIRECT_SRQ_SIZE,
 157                               &srq->queue, &srq->is_direct, pd, 1, &srq->mr);
 158         if (err) {
 159                 kfree(srq->wrid);
 160                 return err;
 161         }
 162
 163         /*
 164          * Now initialize the SRQ buffer so that all of the WQEs are
 165          * linked into the list of free WQEs.  In addition, set the
 166          * scatter list L_Keys to the sentry value of 0x100.
 167          */
 168         for (i = 0; i < srq->max; ++i) {
 169                 wqe = get_wqe(srq, i);
 170
 171                 *wqe_to_link(wqe) = i < srq->max - 1 ? i + 1 : -1;
 172
 173                 for (scatter = wqe + sizeof (struct mthca_next_seg);
 174                      (void *) scatter < wqe + (1 << srq->wqe_shift);
 175                      ++scatter)
 176                         scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
 177         }
 178
 179         srq->last = get_wqe(srq, srq->max - 1);
 180
 181         return 0;
 182 }
 183
 184 int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd,
 185                     struct ib_srq_attr *attr, struct mthca_srq *srq)
 186 {
 187         struct mthca_mailbox *mailbox;
 188         u8 status;
 189         int ds;
 190         int err;
 191
 192         /* Sanity check SRQ size before proceeding */
 193         if (attr->max_wr  > dev->limits.max_srq_wqes ||
 194             attr->max_sge > dev->limits.max_sg)
 195                 return -EINVAL;
 196
 197         srq->max      = attr->max_wr;
 198         srq->max_gs   = attr->max_sge;
 199         srq->counter  = 0;
 200
 201         if (mthca_is_memfree(dev))
 202                 srq->max = roundup_pow_of_two(srq->max + 1);
 203
 204         ds = max(64UL,
 205                  roundup_pow_of_two(sizeof (struct mthca_next_seg) +
 206                                     srq->max_gs * sizeof (struct mthca_data_seg)));
 207         srq->wqe_shift = long_log2(ds);
 208
 209         srq->srqn = mthca_alloc(&dev->srq_table.alloc);
 210         if (srq->srqn == -1)
 211                 return -ENOMEM;
 212
 213         if (mthca_is_memfree(dev)) {
 214                 err = mthca_table_get(dev, dev->srq_table.table, srq->srqn);
 215                 if (err)
 216                         goto err_out;
 217
 218                 if (!pd->ibpd.uobject) {
 219                         srq->db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SRQ,
 220                                                        srq->srqn, &srq->db);
 221                         if (srq->db_index < 0) {
 222                                 err = -ENOMEM;
 223                                 goto err_out_icm;
 224                         }
 225                 }
 226         }
 227
 228         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 229         if (IS_ERR(mailbox)) {
 230                 err = PTR_ERR(mailbox);
 231                 goto err_out_db;
 232         }
 233
 234         err = mthca_alloc_srq_buf(dev, pd, srq);
 235         if (err)
 236                 goto err_out_mailbox;
 237
 238         spin_lock_init(&srq->lock);
 239         atomic_set(&srq->refcount, 1);
 240         init_waitqueue_head(&srq->wait);
 241
 242         if (mthca_is_memfree(dev))
 243                 mthca_arbel_init_srq_context(dev, pd, srq, mailbox->buf);
 244         else
 245                 mthca_tavor_init_srq_context(dev, pd, srq, mailbox->buf);
 246
 247         err = mthca_SW2HW_SRQ(dev, mailbox, srq->srqn, &status);
 248
 249         if (err) {
 250                 mthca_warn(dev, "SW2HW_SRQ failed (%d)\n", err);
 251                 goto err_out_free_buf;
 252         }
 253         if (status) {
 254                 mthca_warn(dev, "SW2HW_SRQ returned status 0x%02x\n",
 255                            status);
 256                 err = -EINVAL;
 257                 goto err_out_free_buf;
 258         }
 259
 260         spin_lock_irq(&dev->srq_table.lock);
 261         if (mthca_array_set(&dev->srq_table.srq,
 262                             srq->srqn & (dev->limits.num_srqs - 1),
 263                             srq)) {
 264                 spin_unlock_irq(&dev->srq_table.lock);
 265                 goto err_out_free_srq;
 266         }
 267         spin_unlock_irq(&dev->srq_table.lock);
 268
 269         mthca_free_mailbox(dev, mailbox);
 270
 271         srq->first_free = 0;
 272         srq->last_free  = srq->max - 1;
 273
 274         return 0;
 275
 276 err_out_free_srq:
 277         err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status);
 278         if (err)
 279                 mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
 280         else if (status)
 281                 mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status);
 282
 283 err_out_free_buf:
 284         if (!pd->ibpd.uobject)
 285                 mthca_free_srq_buf(dev, srq);
 286
 287 err_out_mailbox:
 288         mthca_free_mailbox(dev, mailbox);
 289
 290 err_out_db:
 291         if (!pd->ibpd.uobject && mthca_is_memfree(dev))
 292                 mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
 293
 294 err_out_icm:
 295         mthca_table_put(dev, dev->srq_table.table, srq->srqn);
 296
 297 err_out:
 298         mthca_free(&dev->srq_table.alloc, srq->srqn);
 299
 300         return err;
 301 }
 302
 303 void mthca_free_srq(struct mthca_dev *dev, struct mthca_srq *srq)
 304 {
 305         struct mthca_mailbox *mailbox;
 306         int err;
 307         u8 status;
 308
 309         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 310         if (IS_ERR(mailbox)) {
 311                 mthca_warn(dev, "No memory for mailbox to free SRQ.\n");
 312                 return;
 313         }
 314
 315         err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status);
 316         if (err)
 317                 mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
 318         else if (status)
 319                 mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status);
 320
 321         spin_lock_irq(&dev->srq_table.lock);
 322         mthca_array_clear(&dev->srq_table.srq,
 323                           srq->srqn & (dev->limits.num_srqs - 1));
 324         spin_unlock_irq(&dev->srq_table.lock);
 325
 326         atomic_dec(&srq->refcount);
 327         wait_event(srq->wait, !atomic_read(&srq->refcount));
 328
 329         if (!srq->ibsrq.uobject) {
 330                 mthca_free_srq_buf(dev, srq);
 331                 if (mthca_is_memfree(dev))
 332                         mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
 333         }
 334
 335         mthca_table_put(dev, dev->srq_table.table, srq->srqn);
 336         mthca_free(&dev->srq_table.alloc, srq->srqn);
 337         mthca_free_mailbox(dev, mailbox);
 338 }
 339
 340 int mthca_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 341                      enum ib_srq_attr_mask attr_mask)
 342 {
 343         struct mthca_dev *dev = to_mdev(ibsrq->device);
 344         struct mthca_srq *srq = to_msrq(ibsrq);
 345         int ret;
 346         u8 status;
 347
 348         /* We don't support resizing SRQs (yet?) */
 349         if (attr_mask & IB_SRQ_MAX_WR)
 350                 return -EINVAL;
 351
 352         if (attr_mask & IB_SRQ_LIMIT) {
 353                 ret = mthca_ARM_SRQ(dev, srq->srqn, attr->srq_limit, &status);
 354                 if (ret)
 355                         return ret;
 356                 if (status)
 357                         return -EINVAL;
 358         }
 359
 360         return 0;
 361 }
 362
 363 void mthca_srq_event(struct mthca_dev *dev, u32 srqn,
 364                      enum ib_event_type event_type)
 365 {
 366         struct mthca_srq *srq;
 367         struct ib_event event;
 368
 369         spin_lock(&dev->srq_table.lock);
 370         srq = mthca_array_get(&dev->srq_table.srq, srqn & (dev->limits.num_srqs - 1));
 371         if (srq)
 372                 atomic_inc(&srq->refcount);
 373         spin_unlock(&dev->srq_table.lock);
 374
 375         if (!srq) {
 376                 mthca_warn(dev, "Async event for bogus SRQ %08x\n", srqn);
 377                 return;
 378         }
 379
 380         if (!srq->ibsrq.event_handler)
 381                 goto out;
 382
 383         event.device      = &dev->ib_dev;
 384         event.event       = event_type;
 385         event.element.srq = &srq->ibsrq;
 386         srq->ibsrq.event_handler(&event, srq->ibsrq.srq_context);
 387
 388 out:
 389         if (atomic_dec_and_test(&srq->refcount))
 390                 wake_up(&srq->wait);
 391 }
 392
 393 /*
 394  * This function must be called with IRQs disabled.
 395  */
 396 void mthca_free_srq_wqe(struct mthca_srq *srq, u32 wqe_addr)
 397 {
 398         int ind;
 399
 400         ind = wqe_addr >> srq->wqe_shift;
 401
 402         spin_lock(&srq->lock);
 403
 404         if (likely(srq->first_free >= 0))
 405                 *wqe_to_link(get_wqe(srq, srq->last_free)) = ind;
 406         else
 407                 srq->first_free = ind;
 408
 409         *wqe_to_link(get_wqe(srq, ind)) = -1;
 410         srq->last_free = ind;
 411
 412         spin_unlock(&srq->lock);
 413 }
 414
 415 int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 416                               struct ib_recv_wr **bad_wr)
 417 {
 418         struct mthca_dev *dev = to_mdev(ibsrq->device);
 419         struct mthca_srq *srq = to_msrq(ibsrq);
 420         __be32 doorbell[2];
 421         unsigned long flags;
 422         int err = 0;
 423         int first_ind;
 424         int ind;
 425         int next_ind;
 426         int nreq;
 427         int i;
 428         void *wqe;
 429         void *prev_wqe;
 430
 431         spin_lock_irqsave(&srq->lock, flags);
 432
 433         first_ind = srq->first_free;
 434
 435         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 436                 if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) {
 437                         nreq = 0;
 438
 439                         doorbell[0] = cpu_to_be32(first_ind << srq->wqe_shift);
 440                         doorbell[1] = cpu_to_be32(srq->srqn << 8);
 441
 442                         /*
 443                          * Make sure that descriptors are written
 444                          * before doorbell is rung.
 445                          */
 446                         wmb();
 447
 448                         mthca_write64(doorbell,
 449                                       dev->kar + MTHCA_RECEIVE_DOORBELL,
 450                                       MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
 451
 452                         first_ind = srq->first_free;
 453                 }
 454
 455                 ind = srq->first_free;
 456
 457                 if (ind < 0) {
 458                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
 459                         err = -ENOMEM;
 460                         *bad_wr = wr;
 461                         break;
 462                 }
 463
 464                 wqe       = get_wqe(srq, ind);
 465                 next_ind  = *wqe_to_link(wqe);
 466
 467                 if (next_ind < 0) {
 468                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
 469                         err = -ENOMEM;
 470                         *bad_wr = wr;
 471                         break;
 472                 }
 473
 474                 prev_wqe  = srq->last;
 475                 srq->last = wqe;
 476
 477                 ((struct mthca_next_seg *) wqe)->nda_op = 0;
 478                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
 479                 /* flags field will always remain 0 */
 480
 481                 wqe += sizeof (struct mthca_next_seg);
 482
 483                 if (unlikely(wr->num_sge > srq->max_gs)) {
 484                         err = -EINVAL;
 485                         *bad_wr = wr;
 486                         srq->last = prev_wqe;
 487                         break;
 488                 }
 489
 490                 for (i = 0; i < wr->num_sge; ++i) {
 491                         ((struct mthca_data_seg *) wqe)->byte_count =
 492                                 cpu_to_be32(wr->sg_list[i].length);
 493                         ((struct mthca_data_seg *) wqe)->lkey =
 494                                 cpu_to_be32(wr->sg_list[i].lkey);
 495                         ((struct mthca_data_seg *) wqe)->addr =
 496                                 cpu_to_be64(wr->sg_list[i].addr);
 497                         wqe += sizeof (struct mthca_data_seg);
 498                 }
 499
 500                 if (i < srq->max_gs) {
 501                         ((struct mthca_data_seg *) wqe)->byte_count = 0;
 502                         ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
 503                         ((struct mthca_data_seg *) wqe)->addr = 0;
 504                 }
 505
 506                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
 507                         cpu_to_be32((ind << srq->wqe_shift) | 1);
 508                 wmb();
 509                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
 510                         cpu_to_be32(MTHCA_NEXT_DBD);
 511
 512                 srq->wrid[ind]  = wr->wr_id;
 513                 srq->first_free = next_ind;
 514         }
 515
 516         if (likely(nreq)) {
 517                 doorbell[0] = cpu_to_be32(first_ind << srq->wqe_shift);
 518                 doorbell[1] = cpu_to_be32((srq->srqn << 8) | nreq);
 519
 520                 /*
 521                  * Make sure that descriptors are written before
 522                  * doorbell is rung.
 523                  */
 524                 wmb();
 525
 526                 mthca_write64(doorbell,
 527                               dev->kar + MTHCA_RECEIVE_DOORBELL,
 528                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
 529         }
 530
 531         spin_unlock_irqrestore(&srq->lock, flags);
 532         return err;
 533 }
 534
 535 int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 536                               struct ib_recv_wr **bad_wr)
 537 {
 538         struct mthca_dev *dev = to_mdev(ibsrq->device);
 539         struct mthca_srq *srq = to_msrq(ibsrq);
 540         unsigned long flags;
 541         int err = 0;
 542         int ind;
 543         int next_ind;
 544         int nreq;
 545         int i;
 546         void *wqe;
 547
 548         spin_lock_irqsave(&srq->lock, flags);
 549
 550         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 551                 ind = srq->first_free;
 552
 553                 if (ind < 0) {
 554                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
 555                         err = -ENOMEM;
 556                         *bad_wr = wr;
 557                         break;
 558                 }
 559
 560                 wqe       = get_wqe(srq, ind);
 561                 next_ind  = *wqe_to_link(wqe);
 562
 563                 if (next_ind < 0) {
 564                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
 565                         err = -ENOMEM;
 566                         *bad_wr = wr;
 567                         break;
 568                 }
 569
 570                 ((struct mthca_next_seg *) wqe)->nda_op =
 571                         cpu_to_be32((next_ind << srq->wqe_shift) | 1);
 572                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
 573                 /* flags field will always remain 0 */
 574
 575                 wqe += sizeof (struct mthca_next_seg);
 576
 577                 if (unlikely(wr->num_sge > srq->max_gs)) {
 578                         err = -EINVAL;
 579                         *bad_wr = wr;
 580                         break;
 581                 }
 582
 583                 for (i = 0; i < wr->num_sge; ++i) {
 584                         ((struct mthca_data_seg *) wqe)->byte_count =
 585                                 cpu_to_be32(wr->sg_list[i].length);
 586                         ((struct mthca_data_seg *) wqe)->lkey =
 587                                 cpu_to_be32(wr->sg_list[i].lkey);
 588                         ((struct mthca_data_seg *) wqe)->addr =
 589                                 cpu_to_be64(wr->sg_list[i].addr);
 590                         wqe += sizeof (struct mthca_data_seg);
 591                 }
 592
 593                 if (i < srq->max_gs) {
 594                         ((struct mthca_data_seg *) wqe)->byte_count = 0;
 595                         ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
 596                         ((struct mthca_data_seg *) wqe)->addr = 0;
 597                 }
 598
 599                 srq->wrid[ind]  = wr->wr_id;
 600                 srq->first_free = next_ind;
 601         }
 602
 603         if (likely(nreq)) {
 604                 srq->counter += nreq;
 605
 606                 /*
 607                  * Make sure that descriptors are written before
 608                  * we write doorbell record.
 609                  */
 610                 wmb();
 611                 *srq->db = cpu_to_be32(srq->counter);
 612         }
 613
 614         spin_unlock_irqrestore(&srq->lock, flags);
 615         return err;
 616 }
 617
 618 int __devinit mthca_init_srq_table(struct mthca_dev *dev)
 619 {
 620         int err;
 621
 622         if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
 623                 return 0;
 624
 625         spin_lock_init(&dev->srq_table.lock);
 626
 627         err = mthca_alloc_init(&dev->srq_table.alloc,
 628                                dev->limits.num_srqs,
 629                                dev->limits.num_srqs - 1,
 630                                dev->limits.reserved_srqs);
 631         if (err)
 632                 return err;
 633
 634         err = mthca_array_init(&dev->srq_table.srq,
 635                                dev->limits.num_srqs);
 636         if (err)
 637                 mthca_alloc_cleanup(&dev->srq_table.alloc);
 638
 639         return err;
 640 }
 641
 642 void __devexit mthca_cleanup_srq_table(struct mthca_dev *dev)
 643 {
 644         if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
 645                 return;
 646
 647         mthca_array_cleanup(&dev->srq_table.srq, dev->limits.num_srqs);
 648         mthca_alloc_cleanup(&dev->srq_table.alloc);
 649 }