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, 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;
 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                 memcpy(get_cqe_from_buf(&cq->resize_buf->buf,
 335                                         (i + 1) & cq->resize_buf->cqe),
 336                         get_cqe(cq, i & cq->ibcq.cqe), sizeof(struct mlx4_cqe));
 337                 cqe = get_cqe(cq, ++i & cq->ibcq.cqe);
 338         }
 339         ++cq->mcq.cons_index;
 340 }
 341
 342 int mlx4_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
 343 {
 344         struct mlx4_ib_dev *dev = to_mdev(ibcq->device);
 345         struct mlx4_ib_cq *cq = to_mcq(ibcq);
 346         struct mlx4_mtt mtt;
 347         int outst_cqe;
 348         int err;
 349
 350         mutex_lock(&cq->resize_mutex);
 351
 352         if (entries < 1 || entries > dev->dev->caps.max_cqes) {
 353                 err = -EINVAL;
 354                 goto out;
 355         }
 356
 357         entries = roundup_pow_of_two(entries + 1);
 358         if (entries == ibcq->cqe + 1) {
 359                 err = 0;
 360                 goto out;
 361         }
 362
 363         if (ibcq->uobject) {
 364                 err = mlx4_alloc_resize_umem(dev, cq, entries, udata);
 365                 if (err)
 366                         goto out;
 367         } else {
 368                 /* Can't be smaller then the number of outstanding CQEs */
 369                 outst_cqe = mlx4_ib_get_outstanding_cqes(cq);
 370                 if (entries < outst_cqe + 1) {
 371                         err = 0;
 372                         goto out;
 373                 }
 374
 375                 err = mlx4_alloc_resize_buf(dev, cq, entries);
 376                 if (err)
 377                         goto out;
 378         }
 379
 380         mtt = cq->buf.mtt;
 381
 382         err = mlx4_cq_resize(dev->dev, &cq->mcq, entries, &cq->resize_buf->buf.mtt);
 383         if (err)
 384                 goto err_buf;
 385
 386         mlx4_mtt_cleanup(dev->dev, &mtt);
 387         if (ibcq->uobject) {
 388                 cq->buf      = cq->resize_buf->buf;
 389                 cq->ibcq.cqe = cq->resize_buf->cqe;
 390                 ib_umem_release(cq->umem);
 391                 cq->umem     = cq->resize_umem;
 392
 393                 kfree(cq->resize_buf);
 394                 cq->resize_buf = NULL;
 395                 cq->resize_umem = NULL;
 396         } else {
 397                 spin_lock_irq(&cq->lock);
 398                 if (cq->resize_buf) {
 399                         mlx4_ib_cq_resize_copy_cqes(cq);
 400                         mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 401                         cq->buf      = cq->resize_buf->buf;
 402                         cq->ibcq.cqe = cq->resize_buf->cqe;
 403
 404                         kfree(cq->resize_buf);
 405                         cq->resize_buf = NULL;
 406                 }
 407                 spin_unlock_irq(&cq->lock);
 408         }
 409
 410         goto out;
 411
 412 err_buf:
 413         mlx4_mtt_cleanup(dev->dev, &cq->resize_buf->buf.mtt);
 414         if (!ibcq->uobject)
 415                 mlx4_ib_free_cq_buf(dev, &cq->resize_buf->buf,
 416                                     cq->resize_buf->cqe);
 417
 418         kfree(cq->resize_buf);
 419         cq->resize_buf = NULL;
 420
 421         if (cq->resize_umem) {
 422                 ib_umem_release(cq->resize_umem);
 423                 cq->resize_umem = NULL;
 424         }
 425
 426 out:
 427         mutex_unlock(&cq->resize_mutex);
 428         return err;
 429 }
 430
 431 int mlx4_ib_destroy_cq(struct ib_cq *cq)
 432 {
 433         struct mlx4_ib_dev *dev = to_mdev(cq->device);
 434         struct mlx4_ib_cq *mcq = to_mcq(cq);
 435
 436         mlx4_cq_free(dev->dev, &mcq->mcq);
 437         mlx4_mtt_cleanup(dev->dev, &mcq->buf.mtt);
 438
 439         if (cq->uobject) {
 440                 mlx4_ib_db_unmap_user(to_mucontext(cq->uobject->context), &mcq->db);
 441                 ib_umem_release(mcq->umem);
 442         } else {
 443                 mlx4_ib_free_cq_buf(dev, &mcq->buf, cq->cqe);
 444                 mlx4_db_free(dev->dev, &mcq->db);
 445         }
 446
 447         kfree(mcq);
 448
 449         return 0;
 450 }
 451
 452 static void dump_cqe(void *cqe)
 453 {
 454         __be32 *buf = cqe;
 455
 456         printk(KERN_DEBUG "CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n",
 457                be32_to_cpu(buf[0]), be32_to_cpu(buf[1]), be32_to_cpu(buf[2]),
 458                be32_to_cpu(buf[3]), be32_to_cpu(buf[4]), be32_to_cpu(buf[5]),
 459                be32_to_cpu(buf[6]), be32_to_cpu(buf[7]));
 460 }
 461
 462 static void mlx4_ib_handle_error_cqe(struct mlx4_err_cqe *cqe,
 463                                      struct ib_wc *wc)
 464 {
 465         if (cqe->syndrome == MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR) {
 466                 printk(KERN_DEBUG "local QP operation err "
 467                        "(QPN %06x, WQE index %x, vendor syndrome %02x, "
 468                        "opcode = %02x)\n",
 469                        be32_to_cpu(cqe->my_qpn), be16_to_cpu(cqe->wqe_index),
 470                        cqe->vendor_err_syndrome,
 471                        cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 472                 dump_cqe(cqe);
 473         }
 474
 475         switch (cqe->syndrome) {
 476         case MLX4_CQE_SYNDROME_LOCAL_LENGTH_ERR:
 477                 wc->status = IB_WC_LOC_LEN_ERR;
 478                 break;
 479         case MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR:
 480                 wc->status = IB_WC_LOC_QP_OP_ERR;
 481                 break;
 482         case MLX4_CQE_SYNDROME_LOCAL_PROT_ERR:
 483                 wc->status = IB_WC_LOC_PROT_ERR;
 484                 break;
 485         case MLX4_CQE_SYNDROME_WR_FLUSH_ERR:
 486                 wc->status = IB_WC_WR_FLUSH_ERR;
 487                 break;
 488         case MLX4_CQE_SYNDROME_MW_BIND_ERR:
 489                 wc->status = IB_WC_MW_BIND_ERR;
 490                 break;
 491         case MLX4_CQE_SYNDROME_BAD_RESP_ERR:
 492                 wc->status = IB_WC_BAD_RESP_ERR;
 493                 break;
 494         case MLX4_CQE_SYNDROME_LOCAL_ACCESS_ERR:
 495                 wc->status = IB_WC_LOC_ACCESS_ERR;
 496                 break;
 497         case MLX4_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
 498                 wc->status = IB_WC_REM_INV_REQ_ERR;
 499                 break;
 500         case MLX4_CQE_SYNDROME_REMOTE_ACCESS_ERR:
 501                 wc->status = IB_WC_REM_ACCESS_ERR;
 502                 break;
 503         case MLX4_CQE_SYNDROME_REMOTE_OP_ERR:
 504                 wc->status = IB_WC_REM_OP_ERR;
 505                 break;
 506         case MLX4_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
 507                 wc->status = IB_WC_RETRY_EXC_ERR;
 508                 break;
 509         case MLX4_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
 510                 wc->status = IB_WC_RNR_RETRY_EXC_ERR;
 511                 break;
 512         case MLX4_CQE_SYNDROME_REMOTE_ABORTED_ERR:
 513                 wc->status = IB_WC_REM_ABORT_ERR;
 514                 break;
 515         default:
 516                 wc->status = IB_WC_GENERAL_ERR;
 517                 break;
 518         }
 519
 520         wc->vendor_err = cqe->vendor_err_syndrome;
 521 }
 522
 523 static int mlx4_ib_ipoib_csum_ok(__be16 status, __be16 checksum)
 524 {
 525         return ((status & cpu_to_be16(MLX4_CQE_STATUS_IPV4      |
 526                                       MLX4_CQE_STATUS_IPV4F     |
 527                                       MLX4_CQE_STATUS_IPV4OPT   |
 528                                       MLX4_CQE_STATUS_IPV6      |
 529                                       MLX4_CQE_STATUS_IPOK)) ==
 530                 cpu_to_be16(MLX4_CQE_STATUS_IPV4        |
 531                             MLX4_CQE_STATUS_IPOK))              &&
 532                 (status & cpu_to_be16(MLX4_CQE_STATUS_UDP       |
 533                                       MLX4_CQE_STATUS_TCP))     &&
 534                 checksum == cpu_to_be16(0xffff);
 535 }
 536
 537 static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
 538                             struct mlx4_ib_qp **cur_qp,
 539                             struct ib_wc *wc)
 540 {
 541         struct mlx4_cqe *cqe;
 542         struct mlx4_qp *mqp;
 543         struct mlx4_ib_wq *wq;
 544         struct mlx4_ib_srq *srq;
 545         int is_send;
 546         int is_error;
 547         u32 g_mlpath_rqpn;
 548         u16 wqe_ctr;
 549
 550 repoll:
 551         cqe = next_cqe_sw(cq);
 552         if (!cqe)
 553                 return -EAGAIN;
 554
 555         ++cq->mcq.cons_index;
 556
 557         /*
 558          * Make sure we read CQ entry contents after we've checked the
 559          * ownership bit.
 560          */
 561         rmb();
 562
 563         is_send  = cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK;
 564         is_error = (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 565                 MLX4_CQE_OPCODE_ERROR;
 566
 567         if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_OPCODE_NOP &&
 568                      is_send)) {
 569                 printk(KERN_WARNING "Completion for NOP opcode detected!\n");
 570                 return -EINVAL;
 571         }
 572
 573         /* Resize CQ in progress */
 574         if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_CQE_OPCODE_RESIZE)) {
 575                 if (cq->resize_buf) {
 576                         struct mlx4_ib_dev *dev = to_mdev(cq->ibcq.device);
 577
 578                         mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 579                         cq->buf      = cq->resize_buf->buf;
 580                         cq->ibcq.cqe = cq->resize_buf->cqe;
 581
 582                         kfree(cq->resize_buf);
 583                         cq->resize_buf = NULL;
 584                 }
 585
 586                 goto repoll;
 587         }
 588
 589         if (!*cur_qp ||
 590             (be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) != (*cur_qp)->mqp.qpn) {
 591                 /*
 592                  * We do not have to take the QP table lock here,
 593                  * because CQs will be locked while QPs are removed
 594                  * from the table.
 595                  */
 596                 mqp = __mlx4_qp_lookup(to_mdev(cq->ibcq.device)->dev,
 597                                        be32_to_cpu(cqe->vlan_my_qpn));
 598                 if (unlikely(!mqp)) {
 599                         printk(KERN_WARNING "CQ %06x with entry for unknown QPN %06x\n",
 600                                cq->mcq.cqn, be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK);
 601                         return -EINVAL;
 602                 }
 603
 604                 *cur_qp = to_mibqp(mqp);
 605         }
 606
 607         wc->qp = &(*cur_qp)->ibqp;
 608
 609         if (is_send) {
 610                 wq = &(*cur_qp)->sq;
 611                 if (!(*cur_qp)->sq_signal_bits) {
 612                         wqe_ctr = be16_to_cpu(cqe->wqe_index);
 613                         wq->tail += (u16) (wqe_ctr - (u16) wq->tail);
 614                 }
 615                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 616                 ++wq->tail;
 617         } else if ((*cur_qp)->ibqp.srq) {
 618                 srq = to_msrq((*cur_qp)->ibqp.srq);
 619                 wqe_ctr = be16_to_cpu(cqe->wqe_index);
 620                 wc->wr_id = srq->wrid[wqe_ctr];
 621                 mlx4_ib_free_srq_wqe(srq, wqe_ctr);
 622         } else {
 623                 wq        = &(*cur_qp)->rq;
 624                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 625                 ++wq->tail;
 626         }
 627
 628         if (unlikely(is_error)) {
 629                 mlx4_ib_handle_error_cqe((struct mlx4_err_cqe *) cqe, wc);
 630                 return 0;
 631         }
 632
 633         wc->status = IB_WC_SUCCESS;
 634
 635         if (is_send) {
 636                 wc->wc_flags = 0;
 637                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 638                 case MLX4_OPCODE_RDMA_WRITE_IMM:
 639                         wc->wc_flags |= IB_WC_WITH_IMM;
 640                 case MLX4_OPCODE_RDMA_WRITE:
 641                         wc->opcode    = IB_WC_RDMA_WRITE;
 642                         break;
 643                 case MLX4_OPCODE_SEND_IMM:
 644                         wc->wc_flags |= IB_WC_WITH_IMM;
 645                 case MLX4_OPCODE_SEND:
 646                 case MLX4_OPCODE_SEND_INVAL:
 647                         wc->opcode    = IB_WC_SEND;
 648                         break;
 649                 case MLX4_OPCODE_RDMA_READ:
 650                         wc->opcode    = IB_WC_RDMA_READ;
 651                         wc->byte_len  = be32_to_cpu(cqe->byte_cnt);
 652                         break;
 653                 case MLX4_OPCODE_ATOMIC_CS:
 654                         wc->opcode    = IB_WC_COMP_SWAP;
 655                         wc->byte_len  = 8;
 656                         break;
 657                 case MLX4_OPCODE_ATOMIC_FA:
 658                         wc->opcode    = IB_WC_FETCH_ADD;
 659                         wc->byte_len  = 8;
 660                         break;
 661                 case MLX4_OPCODE_BIND_MW:
 662                         wc->opcode    = IB_WC_BIND_MW;
 663                         break;
 664                 case MLX4_OPCODE_LSO:
 665                         wc->opcode    = IB_WC_LSO;
 666                         break;
 667                 case MLX4_OPCODE_FMR:
 668                         wc->opcode    = IB_WC_FAST_REG_MR;
 669                         break;
 670                 case MLX4_OPCODE_LOCAL_INVAL:
 671                         wc->opcode    = IB_WC_LOCAL_INV;
 672                         break;
 673                 }
 674         } else {
 675                 wc->byte_len = be32_to_cpu(cqe->byte_cnt);
 676
 677                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 678                 case MLX4_RECV_OPCODE_RDMA_WRITE_IMM:
 679                         wc->opcode      = IB_WC_RECV_RDMA_WITH_IMM;
 680                         wc->wc_flags    = IB_WC_WITH_IMM;
 681                         wc->ex.imm_data = cqe->immed_rss_invalid;
 682                         break;
 683                 case MLX4_RECV_OPCODE_SEND_INVAL:
 684                         wc->opcode      = IB_WC_RECV;
 685                         wc->wc_flags    = IB_WC_WITH_INVALIDATE;
 686                         wc->ex.invalidate_rkey = be32_to_cpu(cqe->immed_rss_invalid);
 687                         break;
 688                 case MLX4_RECV_OPCODE_SEND:
 689                         wc->opcode   = IB_WC_RECV;
 690                         wc->wc_flags = 0;
 691                         break;
 692                 case MLX4_RECV_OPCODE_SEND_IMM:
 693                         wc->opcode      = IB_WC_RECV;
 694                         wc->wc_flags    = IB_WC_WITH_IMM;
 695                         wc->ex.imm_data = cqe->immed_rss_invalid;
 696                         break;
 697                 }
 698
 699                 wc->slid           = be16_to_cpu(cqe->rlid);
 700                 wc->sl             = be16_to_cpu(cqe->sl_vid >> 12);
 701                 g_mlpath_rqpn      = be32_to_cpu(cqe->g_mlpath_rqpn);
 702                 wc->src_qp         = g_mlpath_rqpn & 0xffffff;
 703                 wc->dlid_path_bits = (g_mlpath_rqpn >> 24) & 0x7f;
 704                 wc->wc_flags      |= g_mlpath_rqpn & 0x80000000 ? IB_WC_GRH : 0;
 705                 wc->pkey_index     = be32_to_cpu(cqe->immed_rss_invalid) & 0x7f;
 706                 wc->csum_ok        = mlx4_ib_ipoib_csum_ok(cqe->status, cqe->checksum);
 707         }
 708
 709         return 0;
 710 }
 711
 712 int mlx4_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 713 {
 714         struct mlx4_ib_cq *cq = to_mcq(ibcq);
 715         struct mlx4_ib_qp *cur_qp = NULL;
 716         unsigned long flags;
 717         int npolled;
 718         int err = 0;
 719
 720         spin_lock_irqsave(&cq->lock, flags);
 721
 722         for (npolled = 0; npolled < num_entries; ++npolled) {
 723                 err = mlx4_ib_poll_one(cq, &cur_qp, wc + npolled);
 724                 if (err)
 725                         break;
 726         }
 727
 728         if (npolled)
 729                 mlx4_cq_set_ci(&cq->mcq);
 730
 731         spin_unlock_irqrestore(&cq->lock, flags);
 732
 733         if (err == 0 || err == -EAGAIN)
 734                 return npolled;
 735         else
 736                 return err;
 737 }
 738
 739 int mlx4_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
 740 {
 741         mlx4_cq_arm(&to_mcq(ibcq)->mcq,
 742                     (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
 743                     MLX4_CQ_DB_REQ_NOT_SOL : MLX4_CQ_DB_REQ_NOT,
 744                     to_mdev(ibcq->device)->uar_map,
 745                     MLX4_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->uar_lock));
 746
 747         return 0;
 748 }
 749
 750 void __mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 751 {
 752         u32 prod_index;
 753         int nfreed = 0;
 754         struct mlx4_cqe *cqe, *dest;
 755         u8 owner_bit;
 756
 757         /*
 758          * First we need to find the current producer index, so we
 759          * know where to start cleaning from.  It doesn't matter if HW
 760          * adds new entries after this loop -- the QP we're worried
 761          * about is already in RESET, so the new entries won't come
 762          * from our QP and therefore don't need to be checked.
 763          */
 764         for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); ++prod_index)
 765                 if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
 766                         break;
 767
 768         /*
 769          * Now sweep backwards through the CQ, removing CQ entries
 770          * that match our QP by copying older entries on top of them.
 771          */
 772         while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
 773                 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
 774                 if ((be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) == qpn) {
 775                         if (srq && !(cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK))
 776                                 mlx4_ib_free_srq_wqe(srq, be16_to_cpu(cqe->wqe_index));
 777                         ++nfreed;
 778                 } else if (nfreed) {
 779                         dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe);
 780                         owner_bit = dest->owner_sr_opcode & MLX4_CQE_OWNER_MASK;
 781                         memcpy(dest, cqe, sizeof *cqe);
 782                         dest->owner_sr_opcode = owner_bit |
 783                                 (dest->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 784                 }
 785         }
 786
 787         if (nfreed) {
 788                 cq->mcq.cons_index += nfreed;
 789                 /*
 790                  * Make sure update of buffer contents is done before
 791                  * updating consumer index.
 792                  */
 793                 wmb();
 794                 mlx4_cq_set_ci(&cq->mcq);
 795         }
 796 }
 797
 798 void mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 799 {
 800         spin_lock_irq(&cq->lock);
 801         __mlx4_ib_cq_clean(cq, qpn, srq);
 802         spin_unlock_irq(&cq->lock);
 803 }