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