drivers/infiniband/hw/mlx4/cq.c

   1 /*
   2  * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/mlx4/cq.h>
  34 #include <linux/mlx4/qp.h>
  35
  36 #include "mlx4_ib.h"
  37 #include "user.h"
  38
  39 static void mlx4_ib_cq_comp(struct mlx4_cq *cq)
  40 {
  41         struct ib_cq *ibcq = &to_mibcq(cq)->ibcq;
  42         ibcq->comp_handler(ibcq, ibcq->cq_context);
  43 }
  44
  45 static void mlx4_ib_cq_event(struct mlx4_cq *cq, enum mlx4_event type)
  46 {
  47         struct ib_event event;
  48         struct ib_cq *ibcq;
  49
  50         if (type != MLX4_EVENT_TYPE_CQ_ERROR) {
  51                 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
  52                        "on CQ %06x\n", type, cq->cqn);
  53                 return;
  54         }
  55
  56         ibcq = &to_mibcq(cq)->ibcq;
  57         if (ibcq->event_handler) {
  58                 event.device     = ibcq->device;
  59                 event.event      = IB_EVENT_CQ_ERR;
  60                 event.element.cq = ibcq;
  61                 ibcq->event_handler(&event, ibcq->cq_context);
  62         }
  63 }
  64
  65 static void *get_cqe_from_buf(struct mlx4_ib_cq_buf *buf, int n)
  66 {
  67         return mlx4_buf_offset(&buf->buf, n * sizeof (struct mlx4_cqe));
  68 }
  69
  70 static void *get_cqe(struct mlx4_ib_cq *cq, int n)
  71 {
  72         return get_cqe_from_buf(&cq->buf, n);
  73 }
  74
  75 static void *get_sw_cqe(struct mlx4_ib_cq *cq, int n)
  76 {
  77         struct mlx4_cqe *cqe = get_cqe(cq, n & cq->ibcq.cqe);
  78
  79         return (!!(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK) ^
  80                 !!(n & (cq->ibcq.cqe + 1))) ? NULL : cqe;
  81 }
  82
  83 static struct mlx4_cqe *next_cqe_sw(struct mlx4_ib_cq *cq)
  84 {
  85         return get_sw_cqe(cq, cq->mcq.cons_index);
  86 }
  87
  88 int mlx4_ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
  89 {
  90         struct mlx4_ib_cq *mcq = to_mcq(cq);
  91         struct mlx4_ib_dev *dev = to_mdev(cq->device);
  92
  93         return mlx4_cq_modify(dev->dev, &mcq->mcq, cq_count, cq_period);
  94 }
  95
  96 static int mlx4_ib_alloc_cq_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq_buf *buf, int nent)
  97 {
  98         int err;
  99
 100         err = mlx4_buf_alloc(dev->dev, nent * sizeof(struct mlx4_cqe),
 101                              PAGE_SIZE * 2, &buf->buf);
 102
 103         if (err)
 104                 goto out;
 105
 106         err = mlx4_mtt_init(dev->dev, buf->buf.npages, buf->buf.page_shift,
 107                                     &buf->mtt);
 108         if (err)
 109                 goto err_buf;
 110
 111         err = mlx4_buf_write_mtt(dev->dev, &buf->mtt, &buf->buf);
 112         if (err)
 113                 goto err_mtt;
 114
 115         return 0;
 116
 117 err_mtt:
 118         mlx4_mtt_cleanup(dev->dev, &buf->mtt);
 119
 120 err_buf:
 121         mlx4_buf_free(dev->dev, nent * sizeof(struct mlx4_cqe),
 122                               &buf->buf);
 123
 124 out:
 125         return err;
 126 }
 127
 128 static void mlx4_ib_free_cq_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq_buf *buf, int cqe)
 129 {
 130         mlx4_buf_free(dev->dev, (cqe + 1) * sizeof(struct mlx4_cqe), &buf->buf);
 131 }
 132
 133 static int mlx4_ib_get_cq_umem(struct mlx4_ib_dev *dev, struct ib_ucontext *context,
 134                                struct mlx4_ib_cq_buf *buf, struct ib_umem **umem,
 135                                u64 buf_addr, int cqe)
 136 {
 137         int err;
 138
 139         *umem = ib_umem_get(context, buf_addr, cqe * sizeof (struct mlx4_cqe),
 140                             IB_ACCESS_LOCAL_WRITE, 1);
 141         if (IS_ERR(*umem))
 142                 return PTR_ERR(*umem);
 143
 144         err = mlx4_mtt_init(dev->dev, ib_umem_page_count(*umem),
 145                             ilog2((*umem)->page_size), &buf->mtt);
 146         if (err)
 147                 goto err_buf;
 148
 149         err = mlx4_ib_umem_write_mtt(dev, &buf->mtt, *umem);
 150         if (err)
 151                 goto err_mtt;
 152
 153         return 0;
 154
 155 err_mtt:
 156         mlx4_mtt_cleanup(dev->dev, &buf->mtt);
 157
 158 err_buf:
 159         ib_umem_release(*umem);
 160
 161         return err;
 162 }
 163
 164 struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev, int entries, int vector,
 165                                 struct ib_ucontext *context,
 166                                 struct ib_udata *udata)
 167 {
 168         struct mlx4_ib_dev *dev = to_mdev(ibdev);
 169         struct mlx4_ib_cq *cq;
 170         struct mlx4_uar *uar;
 171         int err;
 172
 173         if (entries < 1 || entries > dev->dev->caps.max_cqes)
 174                 return ERR_PTR(-EINVAL);
 175
 176         cq = kmalloc(sizeof *cq, GFP_KERNEL);
 177         if (!cq)
 178                 return ERR_PTR(-ENOMEM);
 179
 180         entries      = roundup_pow_of_two(entries + 1);
 181         cq->ibcq.cqe = entries - 1;
 182         mutex_init(&cq->resize_mutex);
 183         spin_lock_init(&cq->lock);
 184         cq->resize_buf = NULL;
 185         cq->resize_umem = NULL;
 186
 187         if (context) {
 188                 struct mlx4_ib_create_cq ucmd;
 189
 190                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 191                         err = -EFAULT;
 192                         goto err_cq;
 193                 }
 194
 195                 err = mlx4_ib_get_cq_umem(dev, context, &cq->buf, &cq->umem,
 196                                           ucmd.buf_addr, entries);
 197                 if (err)
 198                         goto err_cq;
 199
 200                 err = mlx4_ib_db_map_user(to_mucontext(context), ucmd.db_addr,
 201                                           &cq->db);
 202                 if (err)
 203                         goto err_mtt;
 204
 205                 uar = &to_mucontext(context)->uar;
 206         } else {
 207                 err = mlx4_db_alloc(dev->dev, &cq->db, 1);
 208                 if (err)
 209                         goto err_cq;
 210
 211                 cq->mcq.set_ci_db  = cq->db.db;
 212                 cq->mcq.arm_db     = cq->db.db + 1;
 213                 *cq->mcq.set_ci_db = 0;
 214                 *cq->mcq.arm_db    = 0;
 215
 216                 err = mlx4_ib_alloc_cq_buf(dev, &cq->buf, entries);
 217                 if (err)
 218                         goto err_db;
 219
 220                 uar = &dev->priv_uar;
 221         }
 222
 223         err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar,
 224                             cq->db.dma, &cq->mcq, 0);
 225         if (err)
 226                 goto err_dbmap;
 227
 228         cq->mcq.comp  = mlx4_ib_cq_comp;
 229         cq->mcq.event = mlx4_ib_cq_event;
 230
 231         if (context)
 232                 if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof (__u32))) {
 233                         err = -EFAULT;
 234                         goto err_dbmap;
 235                 }
 236
 237         return &cq->ibcq;
 238
 239 err_dbmap:
 240         if (context)
 241                 mlx4_ib_db_unmap_user(to_mucontext(context), &cq->db);
 242
 243 err_mtt:
 244         mlx4_mtt_cleanup(dev->dev, &cq->buf.mtt);
 245
 246         if (context)
 247                 ib_umem_release(cq->umem);
 248         else
 249                 mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 250
 251 err_db:
 252         if (!context)
 253                 mlx4_db_free(dev->dev, &cq->db);
 254
 255 err_cq:
 256         kfree(cq);
 257
 258         return ERR_PTR(err);
 259 }
 260
 261 static int mlx4_alloc_resize_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
 262                                   int entries)
 263 {
 264         int err;
 265
 266         if (cq->resize_buf)
 267                 return -EBUSY;
 268
 269         cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_ATOMIC);
 270         if (!cq->resize_buf)
 271                 return -ENOMEM;
 272
 273         err = mlx4_ib_alloc_cq_buf(dev, &cq->resize_buf->buf, entries);
 274         if (err) {
 275                 kfree(cq->resize_buf);
 276                 cq->resize_buf = NULL;
 277                 return err;
 278         }
 279
 280         cq->resize_buf->cqe = entries - 1;
 281
 282         return 0;
 283 }
 284
 285 static int mlx4_alloc_resize_umem(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
 286                                    int entries, struct ib_udata *udata)
 287 {
 288         struct mlx4_ib_resize_cq ucmd;
 289         int err;
 290
 291         if (cq->resize_umem)
 292                 return -EBUSY;
 293
 294         if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd))
 295                 return -EFAULT;
 296
 297         cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_ATOMIC);
 298         if (!cq->resize_buf)
 299                 return -ENOMEM;
 300
 301         err = mlx4_ib_get_cq_umem(dev, cq->umem->context, &cq->resize_buf->buf,
 302                                   &cq->resize_umem, ucmd.buf_addr, entries);
 303         if (err) {
 304                 kfree(cq->resize_buf);
 305                 cq->resize_buf = NULL;
 306                 return err;
 307         }
 308
 309         cq->resize_buf->cqe = entries - 1;
 310
 311         return 0;
 312 }
 313
 314 static int mlx4_ib_get_outstanding_cqes(struct mlx4_ib_cq *cq)
 315 {
 316         u32 i;
 317
 318         i = cq->mcq.cons_index;
 319         while (get_sw_cqe(cq, i & cq->ibcq.cqe))
 320                 ++i;
 321
 322         return i - cq->mcq.cons_index;
 323 }
 324
 325 static void mlx4_ib_cq_resize_copy_cqes(struct mlx4_ib_cq *cq)
 326 {
 327         struct mlx4_cqe *cqe;
 328         int i;
 329
 330         i = cq->mcq.cons_index;
 331         cqe = get_cqe(cq, i & cq->ibcq.cqe);
 332         while ((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) != MLX4_CQE_OPCODE_RESIZE) {
 333                 memcpy(get_cqe_from_buf(&cq->resize_buf->buf,
 334                                         (i + 1) & cq->resize_buf->cqe),
 335                         get_cqe(cq, i & cq->ibcq.cqe), sizeof(struct mlx4_cqe));
 336                 cqe = get_cqe(cq, ++i & cq->ibcq.cqe);
 337         }
 338         ++cq->mcq.cons_index;
 339 }
 340
 341 int mlx4_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
 342 {
 343         struct mlx4_ib_dev *dev = to_mdev(ibcq->device);
 344         struct mlx4_ib_cq *cq = to_mcq(ibcq);
 345         int outst_cqe;
 346         int err;
 347
 348         mutex_lock(&cq->resize_mutex);
 349
 350         if (entries < 1 || entries > dev->dev->caps.max_cqes) {
 351                 err = -EINVAL;
 352                 goto out;
 353         }
 354
 355         entries = roundup_pow_of_two(entries + 1);
 356         if (entries == ibcq->cqe + 1) {
 357                 err = 0;
 358                 goto out;
 359         }
 360
 361         if (ibcq->uobject) {
 362                 err = mlx4_alloc_resize_umem(dev, cq, entries, udata);
 363                 if (err)
 364                         goto out;
 365         } else {
 366                 /* Can't be smaller then the number of outstanding CQEs */
 367                 outst_cqe = mlx4_ib_get_outstanding_cqes(cq);
 368                 if (entries < outst_cqe + 1) {
 369                         err = 0;
 370                         goto out;
 371                 }
 372
 373                 err = mlx4_alloc_resize_buf(dev, cq, entries);
 374                 if (err)
 375                         goto out;
 376         }
 377
 378         err = mlx4_cq_resize(dev->dev, &cq->mcq, entries, &cq->resize_buf->buf.mtt);
 379         if (err)
 380                 goto err_buf;
 381
 382         if (ibcq->uobject) {
 383                 cq->buf      = cq->resize_buf->buf;
 384                 cq->ibcq.cqe = cq->resize_buf->cqe;
 385                 ib_umem_release(cq->umem);
 386                 cq->umem     = cq->resize_umem;
 387
 388                 kfree(cq->resize_buf);
 389                 cq->resize_buf = NULL;
 390                 cq->resize_umem = NULL;
 391         } else {
 392                 spin_lock_irq(&cq->lock);
 393                 if (cq->resize_buf) {
 394                         mlx4_ib_cq_resize_copy_cqes(cq);
 395                         mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 396                         cq->buf      = cq->resize_buf->buf;
 397                         cq->ibcq.cqe = cq->resize_buf->cqe;
 398
 399                         kfree(cq->resize_buf);
 400                         cq->resize_buf = NULL;
 401                 }
 402                 spin_unlock_irq(&cq->lock);
 403         }
 404
 405         goto out;
 406
 407 err_buf:
 408         if (!ibcq->uobject)
 409                 mlx4_ib_free_cq_buf(dev, &cq->resize_buf->buf,
 410                                     cq->resize_buf->cqe);
 411
 412         kfree(cq->resize_buf);
 413         cq->resize_buf = NULL;
 414
 415         if (cq->resize_umem) {
 416                 ib_umem_release(cq->resize_umem);
 417                 cq->resize_umem = NULL;
 418         }
 419
 420 out:
 421         mutex_unlock(&cq->resize_mutex);
 422         return err;
 423 }
 424
 425 int mlx4_ib_destroy_cq(struct ib_cq *cq)
 426 {
 427         struct mlx4_ib_dev *dev = to_mdev(cq->device);
 428         struct mlx4_ib_cq *mcq = to_mcq(cq);
 429
 430         mlx4_cq_free(dev->dev, &mcq->mcq);
 431         mlx4_mtt_cleanup(dev->dev, &mcq->buf.mtt);
 432
 433         if (cq->uobject) {
 434                 mlx4_ib_db_unmap_user(to_mucontext(cq->uobject->context), &mcq->db);
 435                 ib_umem_release(mcq->umem);
 436         } else {
 437                 mlx4_ib_free_cq_buf(dev, &mcq->buf, cq->cqe);
 438                 mlx4_db_free(dev->dev, &mcq->db);
 439         }
 440
 441         kfree(mcq);
 442
 443         return 0;
 444 }
 445
 446 static void dump_cqe(void *cqe)
 447 {
 448         __be32 *buf = cqe;
 449
 450         printk(KERN_DEBUG "CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n",
 451                be32_to_cpu(buf[0]), be32_to_cpu(buf[1]), be32_to_cpu(buf[2]),
 452                be32_to_cpu(buf[3]), be32_to_cpu(buf[4]), be32_to_cpu(buf[5]),
 453                be32_to_cpu(buf[6]), be32_to_cpu(buf[7]));
 454 }
 455
 456 static void mlx4_ib_handle_error_cqe(struct mlx4_err_cqe *cqe,
 457                                      struct ib_wc *wc)
 458 {
 459         if (cqe->syndrome == MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR) {
 460                 printk(KERN_DEBUG "local QP operation err "
 461                        "(QPN %06x, WQE index %x, vendor syndrome %02x, "
 462                        "opcode = %02x)\n",
 463                        be32_to_cpu(cqe->my_qpn), be16_to_cpu(cqe->wqe_index),
 464                        cqe->vendor_err_syndrome,
 465                        cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 466                 dump_cqe(cqe);
 467         }
 468
 469         switch (cqe->syndrome) {
 470         case MLX4_CQE_SYNDROME_LOCAL_LENGTH_ERR:
 471                 wc->status = IB_WC_LOC_LEN_ERR;
 472                 break;
 473         case MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR:
 474                 wc->status = IB_WC_LOC_QP_OP_ERR;
 475                 break;
 476         case MLX4_CQE_SYNDROME_LOCAL_PROT_ERR:
 477                 wc->status = IB_WC_LOC_PROT_ERR;
 478                 break;
 479         case MLX4_CQE_SYNDROME_WR_FLUSH_ERR:
 480                 wc->status = IB_WC_WR_FLUSH_ERR;
 481                 break;
 482         case MLX4_CQE_SYNDROME_MW_BIND_ERR:
 483                 wc->status = IB_WC_MW_BIND_ERR;
 484                 break;
 485         case MLX4_CQE_SYNDROME_BAD_RESP_ERR:
 486                 wc->status = IB_WC_BAD_RESP_ERR;
 487                 break;
 488         case MLX4_CQE_SYNDROME_LOCAL_ACCESS_ERR:
 489                 wc->status = IB_WC_LOC_ACCESS_ERR;
 490                 break;
 491         case MLX4_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
 492                 wc->status = IB_WC_REM_INV_REQ_ERR;
 493                 break;
 494         case MLX4_CQE_SYNDROME_REMOTE_ACCESS_ERR:
 495                 wc->status = IB_WC_REM_ACCESS_ERR;
 496                 break;
 497         case MLX4_CQE_SYNDROME_REMOTE_OP_ERR:
 498                 wc->status = IB_WC_REM_OP_ERR;
 499                 break;
 500         case MLX4_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
 501                 wc->status = IB_WC_RETRY_EXC_ERR;
 502                 break;
 503         case MLX4_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
 504                 wc->status = IB_WC_RNR_RETRY_EXC_ERR;
 505                 break;
 506         case MLX4_CQE_SYNDROME_REMOTE_ABORTED_ERR:
 507                 wc->status = IB_WC_REM_ABORT_ERR;
 508                 break;
 509         default:
 510                 wc->status = IB_WC_GENERAL_ERR;
 511                 break;
 512         }
 513
 514         wc->vendor_err = cqe->vendor_err_syndrome;
 515 }
 516
 517 static int mlx4_ib_ipoib_csum_ok(__be32 status, __be16 checksum)
 518 {
 519         return ((status & cpu_to_be32(MLX4_CQE_IPOIB_STATUS_IPV4        |
 520                                       MLX4_CQE_IPOIB_STATUS_IPV4F       |
 521                                       MLX4_CQE_IPOIB_STATUS_IPV4OPT     |
 522                                       MLX4_CQE_IPOIB_STATUS_IPV6        |
 523                                       MLX4_CQE_IPOIB_STATUS_IPOK)) ==
 524                 cpu_to_be32(MLX4_CQE_IPOIB_STATUS_IPV4  |
 525                             MLX4_CQE_IPOIB_STATUS_IPOK))                &&
 526                 (status & cpu_to_be32(MLX4_CQE_IPOIB_STATUS_UDP |
 527                                       MLX4_CQE_IPOIB_STATUS_TCP))       &&
 528                 checksum == cpu_to_be16(0xffff);
 529 }
 530
 531 static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
 532                             struct mlx4_ib_qp **cur_qp,
 533                             struct ib_wc *wc)
 534 {
 535         struct mlx4_cqe *cqe;
 536         struct mlx4_qp *mqp;
 537         struct mlx4_ib_wq *wq;
 538         struct mlx4_ib_srq *srq;
 539         int is_send;
 540         int is_error;
 541         u32 g_mlpath_rqpn;
 542         u16 wqe_ctr;
 543
 544 repoll:
 545         cqe = next_cqe_sw(cq);
 546         if (!cqe)
 547                 return -EAGAIN;
 548
 549         ++cq->mcq.cons_index;
 550
 551         /*
 552          * Make sure we read CQ entry contents after we've checked the
 553          * ownership bit.
 554          */
 555         rmb();
 556
 557         is_send  = cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK;
 558         is_error = (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 559                 MLX4_CQE_OPCODE_ERROR;
 560
 561         if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_OPCODE_NOP &&
 562                      is_send)) {
 563                 printk(KERN_WARNING "Completion for NOP opcode detected!\n");
 564                 return -EINVAL;
 565         }
 566
 567         /* Resize CQ in progress */
 568         if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_CQE_OPCODE_RESIZE)) {
 569                 if (cq->resize_buf) {
 570                         struct mlx4_ib_dev *dev = to_mdev(cq->ibcq.device);
 571
 572                         mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 573                         cq->buf      = cq->resize_buf->buf;
 574                         cq->ibcq.cqe = cq->resize_buf->cqe;
 575
 576                         kfree(cq->resize_buf);
 577                         cq->resize_buf = NULL;
 578                 }
 579
 580                 goto repoll;
 581         }
 582
 583         if (!*cur_qp ||
 584             (be32_to_cpu(cqe->my_qpn) & 0xffffff) != (*cur_qp)->mqp.qpn) {
 585                 /*
 586                  * We do not have to take the QP table lock here,
 587                  * because CQs will be locked while QPs are removed
 588                  * from the table.
 589                  */
 590                 mqp = __mlx4_qp_lookup(to_mdev(cq->ibcq.device)->dev,
 591                                        be32_to_cpu(cqe->my_qpn));
 592                 if (unlikely(!mqp)) {
 593                         printk(KERN_WARNING "CQ %06x with entry for unknown QPN %06x\n",
 594                                cq->mcq.cqn, be32_to_cpu(cqe->my_qpn) & 0xffffff);
 595                         return -EINVAL;
 596                 }
 597
 598                 *cur_qp = to_mibqp(mqp);
 599         }
 600
 601         wc->qp = &(*cur_qp)->ibqp;
 602
 603         if (is_send) {
 604                 wq = &(*cur_qp)->sq;
 605                 if (!(*cur_qp)->sq_signal_bits) {
 606                         wqe_ctr = be16_to_cpu(cqe->wqe_index);
 607                         wq->tail += (u16) (wqe_ctr - (u16) wq->tail);
 608                 }
 609                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 610                 ++wq->tail;
 611         } else if ((*cur_qp)->ibqp.srq) {
 612                 srq = to_msrq((*cur_qp)->ibqp.srq);
 613                 wqe_ctr = be16_to_cpu(cqe->wqe_index);
 614                 wc->wr_id = srq->wrid[wqe_ctr];
 615                 mlx4_ib_free_srq_wqe(srq, wqe_ctr);
 616         } else {
 617                 wq        = &(*cur_qp)->rq;
 618                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 619                 ++wq->tail;
 620         }
 621
 622         if (unlikely(is_error)) {
 623                 mlx4_ib_handle_error_cqe((struct mlx4_err_cqe *) cqe, wc);
 624                 return 0;
 625         }
 626
 627         wc->status = IB_WC_SUCCESS;
 628
 629         if (is_send) {
 630                 wc->wc_flags = 0;
 631                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 632                 case MLX4_OPCODE_RDMA_WRITE_IMM:
 633                         wc->wc_flags |= IB_WC_WITH_IMM;
 634                 case MLX4_OPCODE_RDMA_WRITE:
 635                         wc->opcode    = IB_WC_RDMA_WRITE;
 636                         break;
 637                 case MLX4_OPCODE_SEND_IMM:
 638                         wc->wc_flags |= IB_WC_WITH_IMM;
 639                 case MLX4_OPCODE_SEND:
 640                         wc->opcode    = IB_WC_SEND;
 641                         break;
 642                 case MLX4_OPCODE_RDMA_READ:
 643                         wc->opcode    = IB_WC_RDMA_READ;
 644                         wc->byte_len  = be32_to_cpu(cqe->byte_cnt);
 645                         break;
 646                 case MLX4_OPCODE_ATOMIC_CS:
 647                         wc->opcode    = IB_WC_COMP_SWAP;
 648                         wc->byte_len  = 8;
 649                         break;
 650                 case MLX4_OPCODE_ATOMIC_FA:
 651                         wc->opcode    = IB_WC_FETCH_ADD;
 652                         wc->byte_len  = 8;
 653                         break;
 654                 case MLX4_OPCODE_BIND_MW:
 655                         wc->opcode    = IB_WC_BIND_MW;
 656                         break;
 657                 case MLX4_OPCODE_LSO:
 658                         wc->opcode    = IB_WC_LSO;
 659                         break;
 660                 }
 661         } else {
 662                 wc->byte_len = be32_to_cpu(cqe->byte_cnt);
 663
 664                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 665                 case MLX4_RECV_OPCODE_RDMA_WRITE_IMM:
 666                         wc->opcode      = IB_WC_RECV_RDMA_WITH_IMM;
 667                         wc->wc_flags    = IB_WC_WITH_IMM;
 668                         wc->ex.imm_data = cqe->immed_rss_invalid;
 669                         break;
 670                 case MLX4_RECV_OPCODE_SEND:
 671                         wc->opcode   = IB_WC_RECV;
 672                         wc->wc_flags = 0;
 673                         break;
 674                 case MLX4_RECV_OPCODE_SEND_IMM:
 675                         wc->opcode      = IB_WC_RECV;
 676                         wc->wc_flags    = IB_WC_WITH_IMM;
 677                         wc->ex.imm_data = cqe->immed_rss_invalid;
 678                         break;
 679                 }
 680
 681                 wc->slid           = be16_to_cpu(cqe->rlid);
 682                 wc->sl             = cqe->sl >> 4;
 683                 g_mlpath_rqpn      = be32_to_cpu(cqe->g_mlpath_rqpn);
 684                 wc->src_qp         = g_mlpath_rqpn & 0xffffff;
 685                 wc->dlid_path_bits = (g_mlpath_rqpn >> 24) & 0x7f;
 686                 wc->wc_flags      |= g_mlpath_rqpn & 0x80000000 ? IB_WC_GRH : 0;
 687                 wc->pkey_index     = be32_to_cpu(cqe->immed_rss_invalid) & 0x7f;
 688                 wc->csum_ok        = mlx4_ib_ipoib_csum_ok(cqe->ipoib_status,
 689                                                            cqe->checksum);
 690         }
 691
 692         return 0;
 693 }
 694
 695 int mlx4_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 696 {
 697         struct mlx4_ib_cq *cq = to_mcq(ibcq);
 698         struct mlx4_ib_qp *cur_qp = NULL;
 699         unsigned long flags;
 700         int npolled;
 701         int err = 0;
 702
 703         spin_lock_irqsave(&cq->lock, flags);
 704
 705         for (npolled = 0; npolled < num_entries; ++npolled) {
 706                 err = mlx4_ib_poll_one(cq, &cur_qp, wc + npolled);
 707                 if (err)
 708                         break;
 709         }
 710
 711         if (npolled)
 712                 mlx4_cq_set_ci(&cq->mcq);
 713
 714         spin_unlock_irqrestore(&cq->lock, flags);
 715
 716         if (err == 0 || err == -EAGAIN)
 717                 return npolled;
 718         else
 719                 return err;
 720 }
 721
 722 int mlx4_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
 723 {
 724         mlx4_cq_arm(&to_mcq(ibcq)->mcq,
 725                     (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
 726                     MLX4_CQ_DB_REQ_NOT_SOL : MLX4_CQ_DB_REQ_NOT,
 727                     to_mdev(ibcq->device)->uar_map,
 728                     MLX4_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->uar_lock));
 729
 730         return 0;
 731 }
 732
 733 void __mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 734 {
 735         u32 prod_index;
 736         int nfreed = 0;
 737         struct mlx4_cqe *cqe, *dest;
 738         u8 owner_bit;
 739
 740         /*
 741          * First we need to find the current producer index, so we
 742          * know where to start cleaning from.  It doesn't matter if HW
 743          * adds new entries after this loop -- the QP we're worried
 744          * about is already in RESET, so the new entries won't come
 745          * from our QP and therefore don't need to be checked.
 746          */
 747         for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); ++prod_index)
 748                 if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
 749                         break;
 750
 751         /*
 752          * Now sweep backwards through the CQ, removing CQ entries
 753          * that match our QP by copying older entries on top of them.
 754          */
 755         while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
 756                 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
 757                 if ((be32_to_cpu(cqe->my_qpn) & 0xffffff) == qpn) {
 758                         if (srq && !(cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK))
 759                                 mlx4_ib_free_srq_wqe(srq, be16_to_cpu(cqe->wqe_index));
 760                         ++nfreed;
 761                 } else if (nfreed) {
 762                         dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe);
 763                         owner_bit = dest->owner_sr_opcode & MLX4_CQE_OWNER_MASK;
 764                         memcpy(dest, cqe, sizeof *cqe);
 765                         dest->owner_sr_opcode = owner_bit |
 766                                 (dest->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 767                 }
 768         }
 769
 770         if (nfreed) {
 771                 cq->mcq.cons_index += nfreed;
 772                 /*
 773                  * Make sure update of buffer contents is done before
 774                  * updating consumer index.
 775                  */
 776                 wmb();
 777                 mlx4_cq_set_ci(&cq->mcq);
 778         }
 779 }
 780
 781 void mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 782 {
 783         spin_lock_irq(&cq->lock);
 784         __mlx4_ib_cq_clean(cq, qpn, srq);
 785         spin_unlock_irq(&cq->lock);
 786 }