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 "mthca_dev.h"
  36 #include "mthca_cmd.h"
  37 #include "mthca_memfree.h"
  38 #include "mthca_wqe.h"
  39
  40 enum {
  41         MTHCA_MAX_DIRECT_SRQ_SIZE = 4 * PAGE_SIZE
  42 };
  43
  44 struct mthca_tavor_srq_context {
  45         __be64 wqe_base_ds;     /* low 6 bits is descriptor size */
  46         __be32 state_pd;
  47         __be32 lkey;
  48         __be32 uar;
  49         __be32 wqe_cnt;
  50         u32    reserved[2];
  51 };
  52
  53 struct mthca_arbel_srq_context {
  54         __be32 state_logsize_srqn;
  55         __be32 lkey;
  56         __be32 db_index;
  57         __be32 logstride_usrpage;
  58         __be64 wqe_base;
  59         __be32 eq_pd;
  60         __be16 limit_watermark;
  61         __be16 wqe_cnt;
  62         u16    reserved1;
  63         __be16 wqe_counter;
  64         u32    reserved2[3];
  65 };
  66
  67 static void *get_wqe(struct mthca_srq *srq, int n)
  68 {
  69         if (srq->is_direct)
  70                 return srq->queue.direct.buf + (n << srq->wqe_shift);
  71         else
  72                 return srq->queue.page_list[(n << srq->wqe_shift) >> PAGE_SHIFT].buf +
  73                         ((n << srq->wqe_shift) & (PAGE_SIZE - 1));
  74 }
  75
  76 /*
  77  * Return a pointer to the location within a WQE that we're using as a
  78  * link when the WQE is in the free list.  We use an offset of 4
  79  * because in the Tavor case, posting a WQE may overwrite the first
  80  * four bytes of the previous WQE.  The offset avoids corrupting our
  81  * free list if the WQE has already completed and been put on the free
  82  * list when we post the next WQE.
  83  */
  84 static inline int *wqe_to_link(void *wqe)
  85 {
  86         return (int *) (wqe + 4);
  87 }
  88
  89 static void mthca_tavor_init_srq_context(struct mthca_dev *dev,
  90                                          struct mthca_pd *pd,
  91                                          struct mthca_srq *srq,
  92                                          struct mthca_tavor_srq_context *context)
  93 {
  94         memset(context, 0, sizeof *context);
  95
  96         context->wqe_base_ds = cpu_to_be64(1 << (srq->wqe_shift - 4));
  97         context->state_pd    = cpu_to_be32(pd->pd_num);
  98         context->lkey        = cpu_to_be32(srq->mr.ibmr.lkey);
  99
 100         if (pd->ibpd.uobject)
 101                 context->uar =
 102                         cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index);
 103         else
 104                 context->uar = cpu_to_be32(dev->driver_uar.index);
 105 }
 106
 107 static void mthca_arbel_init_srq_context(struct mthca_dev *dev,
 108                                          struct mthca_pd *pd,
 109                                          struct mthca_srq *srq,
 110                                          struct mthca_arbel_srq_context *context)
 111 {
 112         int logsize;
 113
 114         memset(context, 0, sizeof *context);
 115
 116         logsize = long_log2(srq->max) + srq->wqe_shift;
 117         context->state_logsize_srqn = cpu_to_be32(logsize << 24 | srq->srqn);
 118         context->lkey = cpu_to_be32(srq->mr.ibmr.lkey);
 119         context->db_index = cpu_to_be32(srq->db_index);
 120         context->logstride_usrpage = cpu_to_be32((srq->wqe_shift - 4) << 29);
 121         if (pd->ibpd.uobject)
 122                 context->logstride_usrpage |=
 123                         cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index);
 124         else
 125                 context->logstride_usrpage |= cpu_to_be32(dev->driver_uar.index);
 126         context->eq_pd = cpu_to_be32(MTHCA_EQ_ASYNC << 24 | pd->pd_num);
 127 }
 128
 129 static void mthca_free_srq_buf(struct mthca_dev *dev, struct mthca_srq *srq)
 130 {
 131         mthca_buf_free(dev, srq->max << srq->wqe_shift, &srq->queue,
 132                        srq->is_direct, &srq->mr);
 133         kfree(srq->wrid);
 134 }
 135
 136 static int mthca_alloc_srq_buf(struct mthca_dev *dev, struct mthca_pd *pd,
 137                                struct mthca_srq *srq)
 138 {
 139         struct mthca_data_seg *scatter;
 140         void *wqe;
 141         int err;
 142         int i;
 143
 144         if (pd->ibpd.uobject)
 145                 return 0;
 146
 147         srq->wrid = kmalloc(srq->max * sizeof (u64), GFP_KERNEL);
 148         if (!srq->wrid)
 149                 return -ENOMEM;
 150
 151         err = mthca_buf_alloc(dev, srq->max << srq->wqe_shift,
 152                               MTHCA_MAX_DIRECT_SRQ_SIZE,
 153                               &srq->queue, &srq->is_direct, pd, 1, &srq->mr);
 154         if (err) {
 155                 kfree(srq->wrid);
 156                 return err;
 157         }
 158
 159         /*
 160          * Now initialize the SRQ buffer so that all of the WQEs are
 161          * linked into the list of free WQEs.  In addition, set the
 162          * scatter list L_Keys to the sentry value of 0x100.
 163          */
 164         for (i = 0; i < srq->max; ++i) {
 165                 wqe = get_wqe(srq, i);
 166
 167                 *wqe_to_link(wqe) = i < srq->max - 1 ? i + 1 : -1;
 168
 169                 for (scatter = wqe + sizeof (struct mthca_next_seg);
 170                      (void *) scatter < wqe + (1 << srq->wqe_shift);
 171                      ++scatter)
 172                         scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
 173         }
 174
 175         return 0;
 176 }
 177
 178 int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd,
 179                     struct ib_srq_attr *attr, struct mthca_srq *srq)
 180 {
 181         struct mthca_mailbox *mailbox;
 182         u8 status;
 183         int ds;
 184         int err;
 185
 186         /* Sanity check SRQ size before proceeding */
 187         if (attr->max_wr > 16 << 20 || attr->max_sge > 64)
 188                 return -EINVAL;
 189
 190         srq->max      = attr->max_wr;
 191         srq->max_gs   = attr->max_sge;
 192         srq->last     = NULL;
 193         srq->counter  = 0;
 194
 195         if (mthca_is_memfree(dev))
 196                 srq->max = roundup_pow_of_two(srq->max + 1);
 197
 198         ds = min(64UL,
 199                  roundup_pow_of_two(sizeof (struct mthca_next_seg) +
 200                                     srq->max_gs * sizeof (struct mthca_data_seg)));
 201         srq->wqe_shift = long_log2(ds);
 202
 203         srq->srqn = mthca_alloc(&dev->srq_table.alloc);
 204         if (srq->srqn == -1)
 205                 return -ENOMEM;
 206
 207         if (mthca_is_memfree(dev)) {
 208                 err = mthca_table_get(dev, dev->srq_table.table, srq->srqn);
 209                 if (err)
 210                         goto err_out;
 211
 212                 if (!pd->ibpd.uobject) {
 213                         srq->db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SRQ,
 214                                                        srq->srqn, &srq->db);
 215                         if (srq->db_index < 0) {
 216                                 err = -ENOMEM;
 217                                 goto err_out_icm;
 218                         }
 219                 }
 220         }
 221
 222         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 223         if (IS_ERR(mailbox)) {
 224                 err = PTR_ERR(mailbox);
 225                 goto err_out_db;
 226         }
 227
 228         err = mthca_alloc_srq_buf(dev, pd, srq);
 229         if (err)
 230                 goto err_out_mailbox;
 231
 232         spin_lock_init(&srq->lock);
 233         atomic_set(&srq->refcount, 1);
 234         init_waitqueue_head(&srq->wait);
 235
 236         if (mthca_is_memfree(dev))
 237                 mthca_arbel_init_srq_context(dev, pd, srq, mailbox->buf);
 238         else
 239                 mthca_tavor_init_srq_context(dev, pd, srq, mailbox->buf);
 240
 241         err = mthca_SW2HW_SRQ(dev, mailbox, srq->srqn, &status);
 242
 243         if (err) {
 244                 mthca_warn(dev, "SW2HW_SRQ failed (%d)\n", err);
 245                 goto err_out_free_buf;
 246         }
 247         if (status) {
 248                 mthca_warn(dev, "SW2HW_SRQ returned status 0x%02x\n",
 249                            status);
 250                 err = -EINVAL;
 251                 goto err_out_free_buf;
 252         }
 253
 254         spin_lock_irq(&dev->srq_table.lock);
 255         if (mthca_array_set(&dev->srq_table.srq,
 256                             srq->srqn & (dev->limits.num_srqs - 1),
 257                             srq)) {
 258                 spin_unlock_irq(&dev->srq_table.lock);
 259                 goto err_out_free_srq;
 260         }
 261         spin_unlock_irq(&dev->srq_table.lock);
 262
 263         mthca_free_mailbox(dev, mailbox);
 264
 265         srq->first_free = 0;
 266         srq->last_free  = srq->max - 1;
 267
 268         return 0;
 269
 270 err_out_free_srq:
 271         err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status);
 272         if (err)
 273                 mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
 274         else if (status)
 275                 mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status);
 276
 277 err_out_free_buf:
 278         if (!pd->ibpd.uobject)
 279                 mthca_free_srq_buf(dev, srq);
 280
 281 err_out_mailbox:
 282         mthca_free_mailbox(dev, mailbox);
 283
 284 err_out_db:
 285         if (!pd->ibpd.uobject && mthca_is_memfree(dev))
 286                 mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
 287
 288 err_out_icm:
 289         mthca_table_put(dev, dev->srq_table.table, srq->srqn);
 290
 291 err_out:
 292         mthca_free(&dev->srq_table.alloc, srq->srqn);
 293
 294         return err;
 295 }
 296
 297 void mthca_free_srq(struct mthca_dev *dev, struct mthca_srq *srq)
 298 {
 299         struct mthca_mailbox *mailbox;
 300         int err;
 301         u8 status;
 302
 303         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 304         if (IS_ERR(mailbox)) {
 305                 mthca_warn(dev, "No memory for mailbox to free SRQ.\n");
 306                 return;
 307         }
 308
 309         err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status);
 310         if (err)
 311                 mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
 312         else if (status)
 313                 mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status);
 314
 315         spin_lock_irq(&dev->srq_table.lock);
 316         mthca_array_clear(&dev->srq_table.srq,
 317                           srq->srqn & (dev->limits.num_srqs - 1));
 318         spin_unlock_irq(&dev->srq_table.lock);
 319
 320         atomic_dec(&srq->refcount);
 321         wait_event(srq->wait, !atomic_read(&srq->refcount));
 322
 323         if (!srq->ibsrq.uobject) {
 324                 mthca_free_srq_buf(dev, srq);
 325                 if (mthca_is_memfree(dev))
 326                         mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
 327         }
 328
 329         mthca_table_put(dev, dev->srq_table.table, srq->srqn);
 330         mthca_free(&dev->srq_table.alloc, srq->srqn);
 331         mthca_free_mailbox(dev, mailbox);
 332 }
 333
 334 void mthca_srq_event(struct mthca_dev *dev, u32 srqn,
 335                      enum ib_event_type event_type)
 336 {
 337         struct mthca_srq *srq;
 338         struct ib_event event;
 339
 340         spin_lock(&dev->srq_table.lock);
 341         srq = mthca_array_get(&dev->srq_table.srq, srqn & (dev->limits.num_srqs - 1));
 342         if (srq)
 343                 atomic_inc(&srq->refcount);
 344         spin_unlock(&dev->srq_table.lock);
 345
 346         if (!srq) {
 347                 mthca_warn(dev, "Async event for bogus SRQ %08x\n", srqn);
 348                 return;
 349         }
 350
 351         if (!srq->ibsrq.event_handler)
 352                 goto out;
 353
 354         event.device      = &dev->ib_dev;
 355         event.event       = event_type;
 356         event.element.srq  = &srq->ibsrq;
 357         srq->ibsrq.event_handler(&event, srq->ibsrq.srq_context);
 358
 359 out:
 360         if (atomic_dec_and_test(&srq->refcount))
 361                 wake_up(&srq->wait);
 362 }
 363
 364 /*
 365  * This function must be called with IRQs disabled.
 366  */
 367 void mthca_free_srq_wqe(struct mthca_srq *srq, u32 wqe_addr)
 368 {
 369         int ind;
 370
 371         ind = wqe_addr >> srq->wqe_shift;
 372
 373         spin_lock(&srq->lock);
 374
 375         if (likely(srq->first_free >= 0))
 376                 *wqe_to_link(get_wqe(srq, srq->last_free)) = ind;
 377         else
 378                 srq->first_free = ind;
 379
 380         *wqe_to_link(get_wqe(srq, ind)) = -1;
 381         srq->last_free = ind;
 382
 383         spin_unlock(&srq->lock);
 384 }
 385
 386 int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 387                               struct ib_recv_wr **bad_wr)
 388 {
 389         struct mthca_dev *dev = to_mdev(ibsrq->device);
 390         struct mthca_srq *srq = to_msrq(ibsrq);
 391         unsigned long flags;
 392         int err = 0;
 393         int first_ind;
 394         int ind;
 395         int next_ind;
 396         int nreq;
 397         int i;
 398         void *wqe;
 399         void *prev_wqe;
 400
 401         spin_lock_irqsave(&srq->lock, flags);
 402
 403         first_ind = srq->first_free;
 404
 405         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 406                 ind = srq->first_free;
 407
 408                 if (ind < 0) {
 409                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
 410                         err = -ENOMEM;
 411                         *bad_wr = wr;
 412                         return nreq;
 413                 }
 414
 415                 wqe       = get_wqe(srq, ind);
 416                 next_ind  = *wqe_to_link(wqe);
 417                 prev_wqe  = srq->last;
 418                 srq->last = wqe;
 419
 420                 ((struct mthca_next_seg *) wqe)->nda_op = 0;
 421                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
 422                 /* flags field will always remain 0 */
 423
 424                 wqe += sizeof (struct mthca_next_seg);
 425
 426                 if (unlikely(wr->num_sge > srq->max_gs)) {
 427                         err = -EINVAL;
 428                         *bad_wr = wr;
 429                         srq->last = prev_wqe;
 430                         return nreq;
 431                 }
 432
 433                 for (i = 0; i < wr->num_sge; ++i) {
 434                         ((struct mthca_data_seg *) wqe)->byte_count =
 435                                 cpu_to_be32(wr->sg_list[i].length);
 436                         ((struct mthca_data_seg *) wqe)->lkey =
 437                                 cpu_to_be32(wr->sg_list[i].lkey);
 438                         ((struct mthca_data_seg *) wqe)->addr =
 439                                 cpu_to_be64(wr->sg_list[i].addr);
 440                         wqe += sizeof (struct mthca_data_seg);
 441                 }
 442
 443                 if (i < srq->max_gs) {
 444                         ((struct mthca_data_seg *) wqe)->byte_count = 0;
 445                         ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
 446                         ((struct mthca_data_seg *) wqe)->addr = 0;
 447                 }
 448
 449                 if (likely(prev_wqe)) {
 450                         ((struct mthca_next_seg *) prev_wqe)->nda_op =
 451                                 cpu_to_be32((ind << srq->wqe_shift) | 1);
 452                         wmb();
 453                         ((struct mthca_next_seg *) prev_wqe)->ee_nds =
 454                                 cpu_to_be32(MTHCA_NEXT_DBD);
 455                 }
 456
 457                 srq->wrid[ind]  = wr->wr_id;
 458                 srq->first_free = next_ind;
 459         }
 460
 461         return nreq;
 462
 463         if (likely(nreq)) {
 464                 __be32 doorbell[2];
 465
 466                 doorbell[0] = cpu_to_be32(first_ind << srq->wqe_shift);
 467                 doorbell[1] = cpu_to_be32((srq->srqn << 8) | nreq);
 468
 469                 /*
 470                  * Make sure that descriptors are written before
 471                  * doorbell is rung.
 472                  */
 473                 wmb();
 474
 475                 mthca_write64(doorbell,
 476                               dev->kar + MTHCA_RECEIVE_DOORBELL,
 477                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
 478         }
 479
 480         spin_unlock_irqrestore(&srq->lock, flags);
 481         return err;
 482 }
 483
 484 int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 485                               struct ib_recv_wr **bad_wr)
 486 {
 487         struct mthca_dev *dev = to_mdev(ibsrq->device);
 488         struct mthca_srq *srq = to_msrq(ibsrq);
 489         unsigned long flags;
 490         int err = 0;
 491         int ind;
 492         int next_ind;
 493         int nreq;
 494         int i;
 495         void *wqe;
 496
 497         spin_lock_irqsave(&srq->lock, flags);
 498
 499         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 500                 ind = srq->first_free;
 501
 502                 if (ind < 0) {
 503                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
 504                         err = -ENOMEM;
 505                         *bad_wr = wr;
 506                         return nreq;
 507                 }
 508
 509                 wqe       = get_wqe(srq, ind);
 510                 next_ind  = *wqe_to_link(wqe);
 511
 512                 ((struct mthca_next_seg *) wqe)->nda_op =
 513                         cpu_to_be32((next_ind << srq->wqe_shift) | 1);
 514                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
 515                 /* flags field will always remain 0 */
 516
 517                 wqe += sizeof (struct mthca_next_seg);
 518
 519                 if (unlikely(wr->num_sge > srq->max_gs)) {
 520                         err = -EINVAL;
 521                         *bad_wr = wr;
 522                         return nreq;
 523                 }
 524
 525                 for (i = 0; i < wr->num_sge; ++i) {
 526                         ((struct mthca_data_seg *) wqe)->byte_count =
 527                                 cpu_to_be32(wr->sg_list[i].length);
 528                         ((struct mthca_data_seg *) wqe)->lkey =
 529                                 cpu_to_be32(wr->sg_list[i].lkey);
 530                         ((struct mthca_data_seg *) wqe)->addr =
 531                                 cpu_to_be64(wr->sg_list[i].addr);
 532                         wqe += sizeof (struct mthca_data_seg);
 533                 }
 534
 535                 if (i < srq->max_gs) {
 536                         ((struct mthca_data_seg *) wqe)->byte_count = 0;
 537                         ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
 538                         ((struct mthca_data_seg *) wqe)->addr = 0;
 539                 }
 540
 541                 srq->wrid[ind]  = wr->wr_id;
 542                 srq->first_free = next_ind;
 543         }
 544
 545         if (likely(nreq)) {
 546                 srq->counter += nreq;
 547
 548                 /*
 549                  * Make sure that descriptors are written before
 550                  * we write doorbell record.
 551                  */
 552                 wmb();
 553                 *srq->db = cpu_to_be32(srq->counter);
 554         }
 555
 556         spin_unlock_irqrestore(&srq->lock, flags);
 557         return err;
 558 }
 559
 560 int __devinit mthca_init_srq_table(struct mthca_dev *dev)
 561 {
 562         int err;
 563
 564         if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
 565                 return 0;
 566
 567         spin_lock_init(&dev->srq_table.lock);
 568
 569         err = mthca_alloc_init(&dev->srq_table.alloc,
 570                                dev->limits.num_srqs,
 571                                dev->limits.num_srqs - 1,
 572                                dev->limits.reserved_srqs);
 573         if (err)
 574                 return err;
 575
 576         err = mthca_array_init(&dev->srq_table.srq,
 577                                dev->limits.num_srqs);
 578         if (err)
 579                 mthca_alloc_cleanup(&dev->srq_table.alloc);
 580
 581         return err;
 582 }
 583
 584 void __devexit mthca_cleanup_srq_table(struct mthca_dev *dev)
 585 {
 586         if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
 587                 return;
 588
 589         mthca_array_cleanup(&dev->srq_table.srq, dev->limits.num_srqs);
 590         mthca_alloc_cleanup(&dev->srq_table.alloc);
 591 }