drivers/infiniband/hw/mlx4/cq.c

   1 /*
   2  * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/mlx4/cq.h>
  35 #include <linux/mlx4/qp.h>
  36
  37 #include "mlx4_ib.h"
  38 #include "user.h"
  39
  40 static void mlx4_ib_cq_comp(struct mlx4_cq *cq)
  41 {
  42         struct ib_cq *ibcq = &to_mibcq(cq)->ibcq;
  43         ibcq->comp_handler(ibcq, ibcq->cq_context);
  44 }
  45
  46 static void mlx4_ib_cq_event(struct mlx4_cq *cq, enum mlx4_event type)
  47 {
  48         struct ib_event event;
  49         struct ib_cq *ibcq;
  50
  51         if (type != MLX4_EVENT_TYPE_CQ_ERROR) {
  52                 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
  53                        "on CQ %06x\n", type, cq->cqn);
  54                 return;
  55         }
  56
  57         ibcq = &to_mibcq(cq)->ibcq;
  58         if (ibcq->event_handler) {
  59                 event.device     = ibcq->device;
  60                 event.event      = IB_EVENT_CQ_ERR;
  61                 event.element.cq = ibcq;
  62                 ibcq->event_handler(&event, ibcq->cq_context);
  63         }
  64 }
  65
  66 static void *get_cqe_from_buf(struct mlx4_ib_cq_buf *buf, int n)
  67 {
  68         return mlx4_buf_offset(&buf->buf, n * sizeof (struct mlx4_cqe));
  69 }
  70
  71 static void *get_cqe(struct mlx4_ib_cq *cq, int n)
  72 {
  73         return get_cqe_from_buf(&cq->buf, n);
  74 }
  75
  76 static void *get_sw_cqe(struct mlx4_ib_cq *cq, int n)
  77 {
  78         struct mlx4_cqe *cqe = get_cqe(cq, n & cq->ibcq.cqe);
  79
  80         return (!!(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK) ^
  81                 !!(n & (cq->ibcq.cqe + 1))) ? NULL : cqe;
  82 }
  83
  84 static struct mlx4_cqe *next_cqe_sw(struct mlx4_ib_cq *cq)
  85 {
  86         return get_sw_cqe(cq, cq->mcq.cons_index);
  87 }
  88
  89 int mlx4_ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
  90 {
  91         struct mlx4_ib_cq *mcq = to_mcq(cq);
  92         struct mlx4_ib_dev *dev = to_mdev(cq->device);
  93
  94         return mlx4_cq_modify(dev->dev, &mcq->mcq, cq_count, cq_period);
  95 }
  96
  97 static int mlx4_ib_alloc_cq_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq_buf *buf, int nent)
  98 {
  99         int err;
 100
 101         err = mlx4_buf_alloc(dev->dev, nent * sizeof(struct mlx4_cqe),
 102                              PAGE_SIZE * 2, &buf->buf);
 103
 104         if (err)
 105                 goto out;
 106
 107         err = mlx4_mtt_init(dev->dev, buf->buf.npages, buf->buf.page_shift,
 108                                     &buf->mtt);
 109         if (err)
 110                 goto err_buf;
 111
 112         err = mlx4_buf_write_mtt(dev->dev, &buf->mtt, &buf->buf);
 113         if (err)
 114                 goto err_mtt;
 115
 116         return 0;
 117
 118 err_mtt:
 119         mlx4_mtt_cleanup(dev->dev, &buf->mtt);
 120
 121 err_buf:
 122         mlx4_buf_free(dev->dev, nent * sizeof(struct mlx4_cqe),
 123                               &buf->buf);
 124
 125 out:
 126         return err;
 127 }
 128
 129 static void mlx4_ib_free_cq_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq_buf *buf, int cqe)
 130 {
 131         mlx4_buf_free(dev->dev, (cqe + 1) * sizeof(struct mlx4_cqe), &buf->buf);
 132 }
 133
 134 static int mlx4_ib_get_cq_umem(struct mlx4_ib_dev *dev, struct ib_ucontext *context,
 135                                struct mlx4_ib_cq_buf *buf, struct ib_umem **umem,
 136                                u64 buf_addr, int cqe)
 137 {
 138         int err;
 139
 140         *umem = ib_umem_get(context, buf_addr, cqe * sizeof (struct mlx4_cqe),
 141                             IB_ACCESS_LOCAL_WRITE, 1);
 142         if (IS_ERR(*umem))
 143                 return PTR_ERR(*umem);
 144
 145         err = mlx4_mtt_init(dev->dev, ib_umem_page_count(*umem),
 146                             ilog2((*umem)->page_size), &buf->mtt);
 147         if (err)
 148                 goto err_buf;
 149
 150         err = mlx4_ib_umem_write_mtt(dev, &buf->mtt, *umem);
 151         if (err)
 152                 goto err_mtt;
 153
 154         return 0;
 155
 156 err_mtt:
 157         mlx4_mtt_cleanup(dev->dev, &buf->mtt);
 158
 159 err_buf:
 160         ib_umem_release(*umem);
 161
 162         return err;
 163 }
 164
 165 struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev, int entries, int vector,
 166                                 struct ib_ucontext *context,
 167                                 struct ib_udata *udata)
 168 {
 169         struct mlx4_ib_dev *dev = to_mdev(ibdev);
 170         struct mlx4_ib_cq *cq;
 171         struct mlx4_uar *uar;
 172         int err;
 173
 174         if (entries < 1 || entries > dev->dev->caps.max_cqes)
 175                 return ERR_PTR(-EINVAL);
 176
 177         cq = kmalloc(sizeof *cq, GFP_KERNEL);
 178         if (!cq)
 179                 return ERR_PTR(-ENOMEM);
 180
 181         entries      = roundup_pow_of_two(entries + 1);
 182         cq->ibcq.cqe = entries - 1;
 183         mutex_init(&cq->resize_mutex);
 184         spin_lock_init(&cq->lock);
 185         cq->resize_buf = NULL;
 186         cq->resize_umem = NULL;
 187
 188         if (context) {
 189                 struct mlx4_ib_create_cq ucmd;
 190
 191                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 192                         err = -EFAULT;
 193                         goto err_cq;
 194                 }
 195
 196                 err = mlx4_ib_get_cq_umem(dev, context, &cq->buf, &cq->umem,
 197                                           ucmd.buf_addr, entries);
 198                 if (err)
 199                         goto err_cq;
 200
 201                 err = mlx4_ib_db_map_user(to_mucontext(context), ucmd.db_addr,
 202                                           &cq->db);
 203                 if (err)
 204                         goto err_mtt;
 205
 206                 uar = &to_mucontext(context)->uar;
 207         } else {
 208                 err = mlx4_db_alloc(dev->dev, &cq->db, 1);
 209                 if (err)
 210                         goto err_cq;
 211
 212                 cq->mcq.set_ci_db  = cq->db.db;
 213                 cq->mcq.arm_db     = cq->db.db + 1;
 214                 *cq->mcq.set_ci_db = 0;
 215                 *cq->mcq.arm_db    = 0;
 216
 217                 err = mlx4_ib_alloc_cq_buf(dev, &cq->buf, entries);
 218                 if (err)
 219                         goto err_db;
 220
 221                 uar = &dev->priv_uar;
 222         }
 223
 224         err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar,
 225                             cq->db.dma, &cq->mcq, vector, 0);
 226         if (err)
 227                 goto err_dbmap;
 228
 229         cq->mcq.comp  = mlx4_ib_cq_comp;
 230         cq->mcq.event = mlx4_ib_cq_event;
 231
 232         if (context)
 233                 if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof (__u32))) {
 234                         err = -EFAULT;
 235                         goto err_dbmap;
 236                 }
 237
 238         return &cq->ibcq;
 239
 240 err_dbmap:
 241         if (context)
 242                 mlx4_ib_db_unmap_user(to_mucontext(context), &cq->db);
 243
 244 err_mtt:
 245         mlx4_mtt_cleanup(dev->dev, &cq->buf.mtt);
 246
 247         if (context)
 248                 ib_umem_release(cq->umem);
 249         else
 250                 mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 251
 252 err_db:
 253         if (!context)
 254                 mlx4_db_free(dev->dev, &cq->db);
 255
 256 err_cq:
 257         kfree(cq);
 258
 259         return ERR_PTR(err);
 260 }
 261
 262 static int mlx4_alloc_resize_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
 263                                   int entries)
 264 {
 265         int err;
 266
 267         if (cq->resize_buf)
 268                 return -EBUSY;
 269
 270         cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_ATOMIC);
 271         if (!cq->resize_buf)
 272                 return -ENOMEM;
 273
 274         err = mlx4_ib_alloc_cq_buf(dev, &cq->resize_buf->buf, entries);
 275         if (err) {
 276                 kfree(cq->resize_buf);
 277                 cq->resize_buf = NULL;
 278                 return err;
 279         }
 280
 281         cq->resize_buf->cqe = entries - 1;
 282
 283         return 0;
 284 }
 285
 286 static int mlx4_alloc_resize_umem(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
 287                                    int entries, struct ib_udata *udata)
 288 {
 289         struct mlx4_ib_resize_cq ucmd;
 290         int err;
 291
 292         if (cq->resize_umem)
 293                 return -EBUSY;
 294
 295         if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd))
 296                 return -EFAULT;
 297
 298         cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_ATOMIC);
 299         if (!cq->resize_buf)
 300                 return -ENOMEM;
 301
 302         err = mlx4_ib_get_cq_umem(dev, cq->umem->context, &cq->resize_buf->buf,
 303                                   &cq->resize_umem, ucmd.buf_addr, entries);
 304         if (err) {
 305                 kfree(cq->resize_buf);
 306                 cq->resize_buf = NULL;
 307                 return err;
 308         }
 309
 310         cq->resize_buf->cqe = entries - 1;
 311
 312         return 0;
 313 }
 314
 315 static int mlx4_ib_get_outstanding_cqes(struct mlx4_ib_cq *cq)
 316 {
 317         u32 i;
 318
 319         i = cq->mcq.cons_index;
 320         while (get_sw_cqe(cq, i & cq->ibcq.cqe))
 321                 ++i;
 322
 323         return i - cq->mcq.cons_index;
 324 }
 325
 326 static void mlx4_ib_cq_resize_copy_cqes(struct mlx4_ib_cq *cq)
 327 {
 328         struct mlx4_cqe *cqe, *new_cqe;
 329         int i;
 330
 331         i = cq->mcq.cons_index;
 332         cqe = get_cqe(cq, i & cq->ibcq.cqe);
 333         while ((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) != MLX4_CQE_OPCODE_RESIZE) {
 334                 new_cqe = get_cqe_from_buf(&cq->resize_buf->buf,
 335                                            (i + 1) & cq->resize_buf->cqe);
 336                 memcpy(new_cqe, get_cqe(cq, i & cq->ibcq.cqe), sizeof(struct mlx4_cqe));
 337                 new_cqe->owner_sr_opcode = (cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK) |
 338                         (((i + 1) & (cq->resize_buf->cqe + 1)) ? MLX4_CQE_OWNER_MASK : 0);
 339                 cqe = get_cqe(cq, ++i & cq->ibcq.cqe);
 340         }
 341         ++cq->mcq.cons_index;
 342 }
 343
 344 int mlx4_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
 345 {
 346         struct mlx4_ib_dev *dev = to_mdev(ibcq->device);
 347         struct mlx4_ib_cq *cq = to_mcq(ibcq);
 348         struct mlx4_mtt mtt;
 349         int outst_cqe;
 350         int err;
 351
 352         mutex_lock(&cq->resize_mutex);
 353
 354         if (entries < 1 || entries > dev->dev->caps.max_cqes) {
 355                 err = -EINVAL;
 356                 goto out;
 357         }
 358
 359         entries = roundup_pow_of_two(entries + 1);
 360         if (entries == ibcq->cqe + 1) {
 361                 err = 0;
 362                 goto out;
 363         }
 364
 365         if (ibcq->uobject) {
 366                 err = mlx4_alloc_resize_umem(dev, cq, entries, udata);
 367                 if (err)
 368                         goto out;
 369         } else {
 370                 /* Can't be smaller then the number of outstanding CQEs */
 371                 outst_cqe = mlx4_ib_get_outstanding_cqes(cq);
 372                 if (entries < outst_cqe + 1) {
 373                         err = 0;
 374                         goto out;
 375                 }
 376
 377                 err = mlx4_alloc_resize_buf(dev, cq, entries);
 378                 if (err)
 379                         goto out;
 380         }
 381
 382         mtt = cq->buf.mtt;
 383
 384         err = mlx4_cq_resize(dev->dev, &cq->mcq, entries, &cq->resize_buf->buf.mtt);
 385         if (err)
 386                 goto err_buf;
 387
 388         mlx4_mtt_cleanup(dev->dev, &mtt);
 389         if (ibcq->uobject) {
 390                 cq->buf      = cq->resize_buf->buf;
 391                 cq->ibcq.cqe = cq->resize_buf->cqe;
 392                 ib_umem_release(cq->umem);
 393                 cq->umem     = cq->resize_umem;
 394
 395                 kfree(cq->resize_buf);
 396                 cq->resize_buf = NULL;
 397                 cq->resize_umem = NULL;
 398         } else {
 399                 spin_lock_irq(&cq->lock);
 400                 if (cq->resize_buf) {
 401                         mlx4_ib_cq_resize_copy_cqes(cq);
 402                         mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 403                         cq->buf      = cq->resize_buf->buf;
 404                         cq->ibcq.cqe = cq->resize_buf->cqe;
 405
 406                         kfree(cq->resize_buf);
 407                         cq->resize_buf = NULL;
 408                 }
 409                 spin_unlock_irq(&cq->lock);
 410         }
 411
 412         goto out;
 413
 414 err_buf:
 415         mlx4_mtt_cleanup(dev->dev, &cq->resize_buf->buf.mtt);
 416         if (!ibcq->uobject)
 417                 mlx4_ib_free_cq_buf(dev, &cq->resize_buf->buf,
 418                                     cq->resize_buf->cqe);
 419
 420         kfree(cq->resize_buf);
 421         cq->resize_buf = NULL;
 422
 423         if (cq->resize_umem) {
 424                 ib_umem_release(cq->resize_umem);
 425                 cq->resize_umem = NULL;
 426         }
 427
 428 out:
 429         mutex_unlock(&cq->resize_mutex);
 430         return err;
 431 }
 432
 433 int mlx4_ib_destroy_cq(struct ib_cq *cq)
 434 {
 435         struct mlx4_ib_dev *dev = to_mdev(cq->device);
 436         struct mlx4_ib_cq *mcq = to_mcq(cq);
 437
 438         mlx4_cq_free(dev->dev, &mcq->mcq);
 439         mlx4_mtt_cleanup(dev->dev, &mcq->buf.mtt);
 440
 441         if (cq->uobject) {
 442                 mlx4_ib_db_unmap_user(to_mucontext(cq->uobject->context), &mcq->db);
 443                 ib_umem_release(mcq->umem);
 444         } else {
 445                 mlx4_ib_free_cq_buf(dev, &mcq->buf, cq->cqe);
 446                 mlx4_db_free(dev->dev, &mcq->db);
 447         }
 448
 449         kfree(mcq);
 450
 451         return 0;
 452 }
 453
 454 static void dump_cqe(void *cqe)
 455 {
 456         __be32 *buf = cqe;
 457
 458         printk(KERN_DEBUG "CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n",
 459                be32_to_cpu(buf[0]), be32_to_cpu(buf[1]), be32_to_cpu(buf[2]),
 460                be32_to_cpu(buf[3]), be32_to_cpu(buf[4]), be32_to_cpu(buf[5]),
 461                be32_to_cpu(buf[6]), be32_to_cpu(buf[7]));
 462 }
 463
 464 static void mlx4_ib_handle_error_cqe(struct mlx4_err_cqe *cqe,
 465                                      struct ib_wc *wc)
 466 {
 467         if (cqe->syndrome == MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR) {
 468                 printk(KERN_DEBUG "local QP operation err "
 469                        "(QPN %06x, WQE index %x, vendor syndrome %02x, "
 470                        "opcode = %02x)\n",
 471                        be32_to_cpu(cqe->my_qpn), be16_to_cpu(cqe->wqe_index),
 472                        cqe->vendor_err_syndrome,
 473                        cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 474                 dump_cqe(cqe);
 475         }
 476
 477         switch (cqe->syndrome) {
 478         case MLX4_CQE_SYNDROME_LOCAL_LENGTH_ERR:
 479                 wc->status = IB_WC_LOC_LEN_ERR;
 480                 break;
 481         case MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR:
 482                 wc->status = IB_WC_LOC_QP_OP_ERR;
 483                 break;
 484         case MLX4_CQE_SYNDROME_LOCAL_PROT_ERR:
 485                 wc->status = IB_WC_LOC_PROT_ERR;
 486                 break;
 487         case MLX4_CQE_SYNDROME_WR_FLUSH_ERR:
 488                 wc->status = IB_WC_WR_FLUSH_ERR;
 489                 break;
 490         case MLX4_CQE_SYNDROME_MW_BIND_ERR:
 491                 wc->status = IB_WC_MW_BIND_ERR;
 492                 break;
 493         case MLX4_CQE_SYNDROME_BAD_RESP_ERR:
 494                 wc->status = IB_WC_BAD_RESP_ERR;
 495                 break;
 496         case MLX4_CQE_SYNDROME_LOCAL_ACCESS_ERR:
 497                 wc->status = IB_WC_LOC_ACCESS_ERR;
 498                 break;
 499         case MLX4_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
 500                 wc->status = IB_WC_REM_INV_REQ_ERR;
 501                 break;
 502         case MLX4_CQE_SYNDROME_REMOTE_ACCESS_ERR:
 503                 wc->status = IB_WC_REM_ACCESS_ERR;
 504                 break;
 505         case MLX4_CQE_SYNDROME_REMOTE_OP_ERR:
 506                 wc->status = IB_WC_REM_OP_ERR;
 507                 break;
 508         case MLX4_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
 509                 wc->status = IB_WC_RETRY_EXC_ERR;
 510                 break;
 511         case MLX4_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
 512                 wc->status = IB_WC_RNR_RETRY_EXC_ERR;
 513                 break;
 514         case MLX4_CQE_SYNDROME_REMOTE_ABORTED_ERR:
 515                 wc->status = IB_WC_REM_ABORT_ERR;
 516                 break;
 517         default:
 518                 wc->status = IB_WC_GENERAL_ERR;
 519                 break;
 520         }
 521
 522         wc->vendor_err = cqe->vendor_err_syndrome;
 523 }
 524
 525 static int mlx4_ib_ipoib_csum_ok(__be16 status, __be16 checksum)
 526 {
 527         return ((status & cpu_to_be16(MLX4_CQE_STATUS_IPV4      |
 528                                       MLX4_CQE_STATUS_IPV4F     |
 529                                       MLX4_CQE_STATUS_IPV4OPT   |
 530                                       MLX4_CQE_STATUS_IPV6      |
 531                                       MLX4_CQE_STATUS_IPOK)) ==
 532                 cpu_to_be16(MLX4_CQE_STATUS_IPV4        |
 533                             MLX4_CQE_STATUS_IPOK))              &&
 534                 (status & cpu_to_be16(MLX4_CQE_STATUS_UDP       |
 535                                       MLX4_CQE_STATUS_TCP))     &&
 536                 checksum == cpu_to_be16(0xffff);
 537 }
 538
 539 static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
 540                             struct mlx4_ib_qp **cur_qp,
 541                             struct ib_wc *wc)
 542 {
 543         struct mlx4_cqe *cqe;
 544         struct mlx4_qp *mqp;
 545         struct mlx4_ib_wq *wq;
 546         struct mlx4_ib_srq *srq;
 547         int is_send;
 548         int is_error;
 549         u32 g_mlpath_rqpn;
 550         u16 wqe_ctr;
 551
 552 repoll:
 553         cqe = next_cqe_sw(cq);
 554         if (!cqe)
 555                 return -EAGAIN;
 556
 557         ++cq->mcq.cons_index;
 558
 559         /*
 560          * Make sure we read CQ entry contents after we've checked the
 561          * ownership bit.
 562          */
 563         rmb();
 564
 565         is_send  = cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK;
 566         is_error = (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 567                 MLX4_CQE_OPCODE_ERROR;
 568
 569         if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_OPCODE_NOP &&
 570                      is_send)) {
 571                 printk(KERN_WARNING "Completion for NOP opcode detected!\n");
 572                 return -EINVAL;
 573         }
 574
 575         /* Resize CQ in progress */
 576         if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_CQE_OPCODE_RESIZE)) {
 577                 if (cq->resize_buf) {
 578                         struct mlx4_ib_dev *dev = to_mdev(cq->ibcq.device);
 579
 580                         mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 581                         cq->buf      = cq->resize_buf->buf;
 582                         cq->ibcq.cqe = cq->resize_buf->cqe;
 583
 584                         kfree(cq->resize_buf);
 585                         cq->resize_buf = NULL;
 586                 }
 587
 588                 goto repoll;
 589         }
 590
 591         if (!*cur_qp ||
 592             (be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) != (*cur_qp)->mqp.qpn) {
 593                 /*
 594                  * We do not have to take the QP table lock here,
 595                  * because CQs will be locked while QPs are removed
 596                  * from the table.
 597                  */
 598                 mqp = __mlx4_qp_lookup(to_mdev(cq->ibcq.device)->dev,
 599                                        be32_to_cpu(cqe->vlan_my_qpn));
 600                 if (unlikely(!mqp)) {
 601                         printk(KERN_WARNING "CQ %06x with entry for unknown QPN %06x\n",
 602                                cq->mcq.cqn, be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK);
 603                         return -EINVAL;
 604                 }
 605
 606                 *cur_qp = to_mibqp(mqp);
 607         }
 608
 609         wc->qp = &(*cur_qp)->ibqp;
 610
 611         if (is_send) {
 612                 wq = &(*cur_qp)->sq;
 613                 if (!(*cur_qp)->sq_signal_bits) {
 614                         wqe_ctr = be16_to_cpu(cqe->wqe_index);
 615                         wq->tail += (u16) (wqe_ctr - (u16) wq->tail);
 616                 }
 617                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 618                 ++wq->tail;
 619         } else if ((*cur_qp)->ibqp.srq) {
 620                 srq = to_msrq((*cur_qp)->ibqp.srq);
 621                 wqe_ctr = be16_to_cpu(cqe->wqe_index);
 622                 wc->wr_id = srq->wrid[wqe_ctr];
 623                 mlx4_ib_free_srq_wqe(srq, wqe_ctr);
 624         } else {
 625                 wq        = &(*cur_qp)->rq;
 626                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 627                 ++wq->tail;
 628         }
 629
 630         if (unlikely(is_error)) {
 631                 mlx4_ib_handle_error_cqe((struct mlx4_err_cqe *) cqe, wc);
 632                 return 0;
 633         }
 634
 635         wc->status = IB_WC_SUCCESS;
 636
 637         if (is_send) {
 638                 wc->wc_flags = 0;
 639                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 640                 case MLX4_OPCODE_RDMA_WRITE_IMM:
 641                         wc->wc_flags |= IB_WC_WITH_IMM;
 642                 case MLX4_OPCODE_RDMA_WRITE:
 643                         wc->opcode    = IB_WC_RDMA_WRITE;
 644                         break;
 645                 case MLX4_OPCODE_SEND_IMM:
 646                         wc->wc_flags |= IB_WC_WITH_IMM;
 647                 case MLX4_OPCODE_SEND:
 648                 case MLX4_OPCODE_SEND_INVAL:
 649                         wc->opcode    = IB_WC_SEND;
 650                         break;
 651                 case MLX4_OPCODE_RDMA_READ:
 652                         wc->opcode    = IB_WC_RDMA_READ;
 653                         wc->byte_len  = be32_to_cpu(cqe->byte_cnt);
 654                         break;
 655                 case MLX4_OPCODE_ATOMIC_CS:
 656                         wc->opcode    = IB_WC_COMP_SWAP;
 657                         wc->byte_len  = 8;
 658                         break;
 659                 case MLX4_OPCODE_ATOMIC_FA:
 660                         wc->opcode    = IB_WC_FETCH_ADD;
 661                         wc->byte_len  = 8;
 662                         break;
 663                 case MLX4_OPCODE_BIND_MW:
 664                         wc->opcode    = IB_WC_BIND_MW;
 665                         break;
 666                 case MLX4_OPCODE_LSO:
 667                         wc->opcode    = IB_WC_LSO;
 668                         break;
 669                 case MLX4_OPCODE_FMR:
 670                         wc->opcode    = IB_WC_FAST_REG_MR;
 671                         break;
 672                 case MLX4_OPCODE_LOCAL_INVAL:
 673                         wc->opcode    = IB_WC_LOCAL_INV;
 674                         break;
 675                 }
 676         } else {
 677                 wc->byte_len = be32_to_cpu(cqe->byte_cnt);
 678
 679                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 680                 case MLX4_RECV_OPCODE_RDMA_WRITE_IMM:
 681                         wc->opcode      = IB_WC_RECV_RDMA_WITH_IMM;
 682                         wc->wc_flags    = IB_WC_WITH_IMM;
 683                         wc->ex.imm_data = cqe->immed_rss_invalid;
 684                         break;
 685                 case MLX4_RECV_OPCODE_SEND_INVAL:
 686                         wc->opcode      = IB_WC_RECV;
 687                         wc->wc_flags    = IB_WC_WITH_INVALIDATE;
 688                         wc->ex.invalidate_rkey = be32_to_cpu(cqe->immed_rss_invalid);
 689                         break;
 690                 case MLX4_RECV_OPCODE_SEND:
 691                         wc->opcode   = IB_WC_RECV;
 692                         wc->wc_flags = 0;
 693                         break;
 694                 case MLX4_RECV_OPCODE_SEND_IMM:
 695                         wc->opcode      = IB_WC_RECV;
 696                         wc->wc_flags    = IB_WC_WITH_IMM;
 697                         wc->ex.imm_data = cqe->immed_rss_invalid;
 698                         break;
 699                 }
 700
 701                 wc->slid           = be16_to_cpu(cqe->rlid);
 702                 wc->sl             = be16_to_cpu(cqe->sl_vid >> 12);
 703                 g_mlpath_rqpn      = be32_to_cpu(cqe->g_mlpath_rqpn);
 704                 wc->src_qp         = g_mlpath_rqpn & 0xffffff;
 705                 wc->dlid_path_bits = (g_mlpath_rqpn >> 24) & 0x7f;
 706                 wc->wc_flags      |= g_mlpath_rqpn & 0x80000000 ? IB_WC_GRH : 0;
 707                 wc->pkey_index     = be32_to_cpu(cqe->immed_rss_invalid) & 0x7f;
 708                 wc->csum_ok        = mlx4_ib_ipoib_csum_ok(cqe->status, cqe->checksum);
 709         }
 710
 711         return 0;
 712 }
 713
 714 int mlx4_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 715 {
 716         struct mlx4_ib_cq *cq = to_mcq(ibcq);
 717         struct mlx4_ib_qp *cur_qp = NULL;
 718         unsigned long flags;
 719         int npolled;
 720         int err = 0;
 721
 722         spin_lock_irqsave(&cq->lock, flags);
 723
 724         for (npolled = 0; npolled < num_entries; ++npolled) {
 725                 err = mlx4_ib_poll_one(cq, &cur_qp, wc + npolled);
 726                 if (err)
 727                         break;
 728         }
 729
 730         if (npolled)
 731                 mlx4_cq_set_ci(&cq->mcq);
 732
 733         spin_unlock_irqrestore(&cq->lock, flags);
 734
 735         if (err == 0 || err == -EAGAIN)
 736                 return npolled;
 737         else
 738                 return err;
 739 }
 740
 741 int mlx4_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
 742 {
 743         mlx4_cq_arm(&to_mcq(ibcq)->mcq,
 744                     (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
 745                     MLX4_CQ_DB_REQ_NOT_SOL : MLX4_CQ_DB_REQ_NOT,
 746                     to_mdev(ibcq->device)->uar_map,
 747                     MLX4_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->uar_lock));
 748
 749         return 0;
 750 }
 751
 752 void __mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 753 {
 754         u32 prod_index;
 755         int nfreed = 0;
 756         struct mlx4_cqe *cqe, *dest;
 757         u8 owner_bit;
 758
 759         /*
 760          * First we need to find the current producer index, so we
 761          * know where to start cleaning from.  It doesn't matter if HW
 762          * adds new entries after this loop -- the QP we're worried
 763          * about is already in RESET, so the new entries won't come
 764          * from our QP and therefore don't need to be checked.
 765          */
 766         for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); ++prod_index)
 767                 if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
 768                         break;
 769
 770         /*
 771          * Now sweep backwards through the CQ, removing CQ entries
 772          * that match our QP by copying older entries on top of them.
 773          */
 774         while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
 775                 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
 776                 if ((be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) == qpn) {
 777                         if (srq && !(cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK))
 778                                 mlx4_ib_free_srq_wqe(srq, be16_to_cpu(cqe->wqe_index));
 779                         ++nfreed;
 780                 } else if (nfreed) {
 781                         dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe);
 782                         owner_bit = dest->owner_sr_opcode & MLX4_CQE_OWNER_MASK;
 783                         memcpy(dest, cqe, sizeof *cqe);
 784                         dest->owner_sr_opcode = owner_bit |
 785                                 (dest->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 786                 }
 787         }
 788
 789         if (nfreed) {
 790                 cq->mcq.cons_index += nfreed;
 791                 /*
 792                  * Make sure update of buffer contents is done before
 793                  * updating consumer index.
 794                  */
 795                 wmb();
 796                 mlx4_cq_set_ci(&cq->mcq);
 797         }
 798 }
 799
 800 void mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 801 {
 802         spin_lock_irq(&cq->lock);
 803         __mlx4_ib_cq_clean(cq, qpn, srq);
 804         spin_unlock_irq(&cq->lock);
 805 }