SAFE public projects git trees. - safe/jmp/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         srq->last = get_wqe(srq, srq->max - 1);
 176
 177         return 0;
 178 }
 179
 180 int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd,
 181                     struct ib_srq_attr *attr, struct mthca_srq *srq)
 182 {
 183         struct mthca_mailbox *mailbox;
 184         u8 status;
 185         int ds;
 186         int err;
 187
 188         /* Sanity check SRQ size before proceeding */
 189         if (attr->max_wr > 16 << 20 || attr->max_sge > 64)
 190                 return -EINVAL;
 191
 192         srq->max      = attr->max_wr;
 193         srq->max_gs   = attr->max_sge;
 194         srq->counter  = 0;
 195
 196         if (mthca_is_memfree(dev))
 197                 srq->max = roundup_pow_of_two(srq->max + 1);
 198
 199         ds = min(64UL,
 200                  roundup_pow_of_two(sizeof (struct mthca_next_seg) +
 201                                     srq->max_gs * sizeof (struct mthca_data_seg)));
 202         srq->wqe_shift = long_log2(ds);
 203
 204         srq->srqn = mthca_alloc(&dev->srq_table.alloc);
 205         if (srq->srqn == -1)
 206                 return -ENOMEM;
 207
 208         if (mthca_is_memfree(dev)) {
 209                 err = mthca_table_get(dev, dev->srq_table.table, srq->srqn);
 210                 if (err)
 211                         goto err_out;
 212
 213                 if (!pd->ibpd.uobject) {
 214                         srq->db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SRQ,
 215                                                        srq->srqn, &srq->db);
 216                         if (srq->db_index < 0) {
 217                                 err = -ENOMEM;
 218                                 goto err_out_icm;
 219                         }
 220                 }
 221         }
 222
 223         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 224         if (IS_ERR(mailbox)) {
 225                 err = PTR_ERR(mailbox);
 226                 goto err_out_db;
 227         }
 228
 229         err = mthca_alloc_srq_buf(dev, pd, srq);
 230         if (err)
 231                 goto err_out_mailbox;
 232
 233         spin_lock_init(&srq->lock);
 234         atomic_set(&srq->refcount, 1);
 235         init_waitqueue_head(&srq->wait);
 236
 237         if (mthca_is_memfree(dev))
 238                 mthca_arbel_init_srq_context(dev, pd, srq, mailbox->buf);
 239         else
 240                 mthca_tavor_init_srq_context(dev, pd, srq, mailbox->buf);
 241
 242         err = mthca_SW2HW_SRQ(dev, mailbox, srq->srqn, &status);
 243
 244         if (err) {
 245                 mthca_warn(dev, "SW2HW_SRQ failed (%d)\n", err);
 246                 goto err_out_free_buf;
 247         }
 248         if (status) {
 249                 mthca_warn(dev, "SW2HW_SRQ returned status 0x%02x\n",
 250                            status);
 251                 err = -EINVAL;
 252                 goto err_out_free_buf;
 253         }
 254
 255         spin_lock_irq(&dev->srq_table.lock);
 256         if (mthca_array_set(&dev->srq_table.srq,
 257                             srq->srqn & (dev->limits.num_srqs - 1),
 258                             srq)) {
 259                 spin_unlock_irq(&dev->srq_table.lock);
 260                 goto err_out_free_srq;
 261         }
 262         spin_unlock_irq(&dev->srq_table.lock);
 263
 264         mthca_free_mailbox(dev, mailbox);
 265
 266         srq->first_free = 0;
 267         srq->last_free  = srq->max - 1;
 268
 269         return 0;
 270
 271 err_out_free_srq:
 272         err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status);
 273         if (err)
 274                 mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
 275         else if (status)
 276                 mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status);
 277
 278 err_out_free_buf:
 279         if (!pd->ibpd.uobject)
 280                 mthca_free_srq_buf(dev, srq);
 281
 282 err_out_mailbox:
 283         mthca_free_mailbox(dev, mailbox);
 284
 285 err_out_db:
 286         if (!pd->ibpd.uobject && mthca_is_memfree(dev))
 287                 mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
 288
 289 err_out_icm:
 290         mthca_table_put(dev, dev->srq_table.table, srq->srqn);
 291
 292 err_out:
 293         mthca_free(&dev->srq_table.alloc, srq->srqn);
 294
 295         return err;
 296 }
 297
 298 void mthca_free_srq(struct mthca_dev *dev, struct mthca_srq *srq)
 299 {
 300         struct mthca_mailbox *mailbox;
 301         int err;
 302         u8 status;
 303
 304         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 305         if (IS_ERR(mailbox)) {
 306                 mthca_warn(dev, "No memory for mailbox to free SRQ.\n");
 307                 return;
 308         }
 309
 310         err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status);
 311         if (err)
 312                 mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
 313         else if (status)
 314                 mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status);
 315
 316         spin_lock_irq(&dev->srq_table.lock);
 317         mthca_array_clear(&dev->srq_table.srq,
 318                           srq->srqn & (dev->limits.num_srqs - 1));
 319         spin_unlock_irq(&dev->srq_table.lock);
 320
 321         atomic_dec(&srq->refcount);
 322         wait_event(srq->wait, !atomic_read(&srq->refcount));
 323
 324         if (!srq->ibsrq.uobject) {
 325                 mthca_free_srq_buf(dev, srq);
 326                 if (mthca_is_memfree(dev))
 327                         mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
 328         }
 329
 330         mthca_table_put(dev, dev->srq_table.table, srq->srqn);
 331         mthca_free(&dev->srq_table.alloc, srq->srqn);
 332         mthca_free_mailbox(dev, mailbox);
 333 }
 334
 335 void mthca_srq_event(struct mthca_dev *dev, u32 srqn,
 336                      enum ib_event_type event_type)
 337 {
 338         struct mthca_srq *srq;
 339         struct ib_event event;
 340
 341         spin_lock(&dev->srq_table.lock);
 342         srq = mthca_array_get(&dev->srq_table.srq, srqn & (dev->limits.num_srqs - 1));
 343         if (srq)
 344                 atomic_inc(&srq->refcount);
 345         spin_unlock(&dev->srq_table.lock);
 346
 347         if (!srq) {
 348                 mthca_warn(dev, "Async event for bogus SRQ %08x\n", srqn);
 349                 return;
 350         }
 351
 352         if (!srq->ibsrq.event_handler)
 353                 goto out;
 354
 355         event.device      = &dev->ib_dev;
 356         event.event       = event_type;
 357         event.element.srq  = &srq->ibsrq;
 358         srq->ibsrq.event_handler(&event, srq->ibsrq.srq_context);
 359
 360 out:
 361         if (atomic_dec_and_test(&srq->refcount))
 362                 wake_up(&srq->wait);
 363 }
 364
 365 /*
 366  * This function must be called with IRQs disabled.
 367  */
 368 void mthca_free_srq_wqe(struct mthca_srq *srq, u32 wqe_addr)
 369 {
 370         int ind;
 371
 372         ind = wqe_addr >> srq->wqe_shift;
 373
 374         spin_lock(&srq->lock);
 375
 376         if (likely(srq->first_free >= 0))
 377                 *wqe_to_link(get_wqe(srq, srq->last_free)) = ind;
 378         else
 379                 srq->first_free = ind;
 380
 381         *wqe_to_link(get_wqe(srq, ind)) = -1;
 382         srq->last_free = ind;
 383
 384         spin_unlock(&srq->lock);
 385 }
 386
 387 int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 388                               struct ib_recv_wr **bad_wr)
 389 {
 390         struct mthca_dev *dev = to_mdev(ibsrq->device);
 391         struct mthca_srq *srq = to_msrq(ibsrq);
 392         unsigned long flags;
 393         int err = 0;
 394         int first_ind;
 395         int ind;
 396         int next_ind;
 397         int nreq;
 398         int i;
 399         void *wqe;
 400         void *prev_wqe;
 401
 402         spin_lock_irqsave(&srq->lock, flags);
 403
 404         first_ind = srq->first_free;
 405
 406         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 407                 ind = srq->first_free;
 408
 409                 if (ind < 0) {
 410                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
 411                         err = -ENOMEM;
 412                         *bad_wr = wr;
 413                         break;
 414                 }
 415
 416                 wqe       = get_wqe(srq, ind);
 417                 next_ind  = *wqe_to_link(wqe);
 418                 prev_wqe  = srq->last;
 419                 srq->last = wqe;
 420
 421                 ((struct mthca_next_seg *) wqe)->nda_op = 0;
 422                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
 423                 /* flags field will always remain 0 */
 424
 425                 wqe += sizeof (struct mthca_next_seg);
 426
 427                 if (unlikely(wr->num_sge > srq->max_gs)) {
 428                         err = -EINVAL;
 429                         *bad_wr = wr;
 430                         srq->last = prev_wqe;
 431                         break;
 432                 }
 433
 434                 for (i = 0; i < wr->num_sge; ++i) {
 435                         ((struct mthca_data_seg *) wqe)->byte_count =
 436                                 cpu_to_be32(wr->sg_list[i].length);
 437                         ((struct mthca_data_seg *) wqe)->lkey =
 438                                 cpu_to_be32(wr->sg_list[i].lkey);
 439                         ((struct mthca_data_seg *) wqe)->addr =
 440                                 cpu_to_be64(wr->sg_list[i].addr);
 441                         wqe += sizeof (struct mthca_data_seg);
 442                 }
 443
 444                 if (i < srq->max_gs) {
 445                         ((struct mthca_data_seg *) wqe)->byte_count = 0;
 446                         ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
 447                         ((struct mthca_data_seg *) wqe)->addr = 0;
 448                 }
 449
 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                 srq->wrid[ind]  = wr->wr_id;
 457                 srq->first_free = next_ind;
 458         }
 459
 460         if (likely(nreq)) {
 461                 __be32 doorbell[2];
 462
 463                 doorbell[0] = cpu_to_be32(first_ind << srq->wqe_shift);
 464                 doorbell[1] = cpu_to_be32((srq->srqn << 8) | nreq);
 465
 466                 /*
 467                  * Make sure that descriptors are written before
 468                  * doorbell is rung.
 469                  */
 470                 wmb();
 471
 472                 mthca_write64(doorbell,
 473                               dev->kar + MTHCA_RECEIVE_DOORBELL,
 474                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
 475         }
 476
 477         spin_unlock_irqrestore(&srq->lock, flags);
 478         return err;
 479 }
 480
 481 int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 482                               struct ib_recv_wr **bad_wr)
 483 {
 484         struct mthca_dev *dev = to_mdev(ibsrq->device);
 485         struct mthca_srq *srq = to_msrq(ibsrq);
 486         unsigned long flags;
 487         int err = 0;
 488         int ind;
 489         int next_ind;
 490         int nreq;
 491         int i;
 492         void *wqe;
 493
 494         spin_lock_irqsave(&srq->lock, flags);
 495
 496         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 497                 ind = srq->first_free;
 498
 499                 if (ind < 0) {
 500                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
 501                         err = -ENOMEM;
 502                         *bad_wr = wr;
 503                         break;
 504                 }
 505
 506                 wqe       = get_wqe(srq, ind);
 507                 next_ind  = *wqe_to_link(wqe);
 508
 509                 ((struct mthca_next_seg *) wqe)->nda_op =
 510                         cpu_to_be32((next_ind << srq->wqe_shift) | 1);
 511                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
 512                 /* flags field will always remain 0 */
 513
 514                 wqe += sizeof (struct mthca_next_seg);
 515
 516                 if (unlikely(wr->num_sge > srq->max_gs)) {
 517                         err = -EINVAL;
 518                         *bad_wr = wr;
 519                         break;
 520                 }
 521
 522                 for (i = 0; i < wr->num_sge; ++i) {
 523                         ((struct mthca_data_seg *) wqe)->byte_count =
 524                                 cpu_to_be32(wr->sg_list[i].length);
 525                         ((struct mthca_data_seg *) wqe)->lkey =
 526                                 cpu_to_be32(wr->sg_list[i].lkey);
 527                         ((struct mthca_data_seg *) wqe)->addr =
 528                                 cpu_to_be64(wr->sg_list[i].addr);
 529                         wqe += sizeof (struct mthca_data_seg);
 530                 }
 531
 532                 if (i < srq->max_gs) {
 533                         ((struct mthca_data_seg *) wqe)->byte_count = 0;
 534                         ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
 535                         ((struct mthca_data_seg *) wqe)->addr = 0;
 536                 }
 537
 538                 srq->wrid[ind]  = wr->wr_id;
 539                 srq->first_free = next_ind;
 540         }
 541
 542         if (likely(nreq)) {
 543                 srq->counter += nreq;
 544
 545                 /*
 546                  * Make sure that descriptors are written before
 547                  * we write doorbell record.
 548                  */
 549                 wmb();
 550                 *srq->db = cpu_to_be32(srq->counter);
 551         }
 552
 553         spin_unlock_irqrestore(&srq->lock, flags);
 554         return err;
 555 }
 556
 557 int __devinit mthca_init_srq_table(struct mthca_dev *dev)
 558 {
 559         int err;
 560
 561         if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
 562                 return 0;
 563
 564         spin_lock_init(&dev->srq_table.lock);
 565
 566         err = mthca_alloc_init(&dev->srq_table.alloc,
 567                                dev->limits.num_srqs,
 568                                dev->limits.num_srqs - 1,
 569                                dev->limits.reserved_srqs);
 570         if (err)
 571                 return err;
 572
 573         err = mthca_array_init(&dev->srq_table.srq,
 574                                dev->limits.num_srqs);
 575         if (err)
 576                 mthca_alloc_cleanup(&dev->srq_table.alloc);
 577
 578         return err;
 579 }
 580
 581 void __devexit mthca_cleanup_srq_table(struct mthca_dev *dev)
 582 {
 583         if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
 584                 return;
 585
 586         mthca_array_cleanup(&dev->srq_table.srq, dev->limits.num_srqs);
 587         mthca_alloc_cleanup(&dev->srq_table.alloc);
 588 }