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 #include <linux/mlx4/srq.h>
  37 #include <linux/slab.h>
  38
  39 #include "mlx4_ib.h"
  40 #include "user.h"
  41
  42 static void mlx4_ib_cq_comp(struct mlx4_cq *cq)
  43 {
  44         struct ib_cq *ibcq = &to_mibcq(cq)->ibcq;
  45         ibcq->comp_handler(ibcq, ibcq->cq_context);
  46 }
  47
  48 static void mlx4_ib_cq_event(struct mlx4_cq *cq, enum mlx4_event type)
  49 {
  50         struct ib_event event;
  51         struct ib_cq *ibcq;
  52
  53         if (type != MLX4_EVENT_TYPE_CQ_ERROR) {
  54                 pr_warn("Unexpected event type %d "
  55                        "on CQ %06x\n", type, cq->cqn);
  56                 return;
  57         }
  58
  59         ibcq = &to_mibcq(cq)->ibcq;
  60         if (ibcq->event_handler) {
  61                 event.device     = ibcq->device;
  62                 event.event      = IB_EVENT_CQ_ERR;
  63                 event.element.cq = ibcq;
  64                 ibcq->event_handler(&event, ibcq->cq_context);
  65         }
  66 }
  67
  68 static void *get_cqe_from_buf(struct mlx4_ib_cq_buf *buf, int n)
  69 {
  70         return mlx4_buf_offset(&buf->buf, n * buf->entry_size);
  71 }
  72
  73 static void *get_cqe(struct mlx4_ib_cq *cq, int n)
  74 {
  75         return get_cqe_from_buf(&cq->buf, n);
  76 }
  77
  78 static void *get_sw_cqe(struct mlx4_ib_cq *cq, int n)
  79 {
  80         struct mlx4_cqe *cqe = get_cqe(cq, n & cq->ibcq.cqe);
  81         struct mlx4_cqe *tcqe = ((cq->buf.entry_size == 64) ? (cqe + 1) : cqe);
  82
  83         return (!!(tcqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK) ^
  84                 !!(n & (cq->ibcq.cqe + 1))) ? NULL : cqe;
  85 }
  86
  87 static struct mlx4_cqe *next_cqe_sw(struct mlx4_ib_cq *cq)
  88 {
  89         return get_sw_cqe(cq, cq->mcq.cons_index);
  90 }
  91
  92 int mlx4_ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
  93 {
  94         struct mlx4_ib_cq *mcq = to_mcq(cq);
  95         struct mlx4_ib_dev *dev = to_mdev(cq->device);
  96
  97         return mlx4_cq_modify(dev->dev, &mcq->mcq, cq_count, cq_period);
  98 }
  99
 100 static int mlx4_ib_alloc_cq_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq_buf *buf, int nent)
 101 {
 102         int err;
 103
 104         err = mlx4_buf_alloc(dev->dev, nent * dev->dev->caps.cqe_size,
 105                              PAGE_SIZE * 2, &buf->buf);
 106
 107         if (err)
 108                 goto out;
 109
 110         buf->entry_size = dev->dev->caps.cqe_size;
 111         err = mlx4_mtt_init(dev->dev, buf->buf.npages, buf->buf.page_shift,
 112                                     &buf->mtt);
 113         if (err)
 114                 goto err_buf;
 115
 116         err = mlx4_buf_write_mtt(dev->dev, &buf->mtt, &buf->buf);
 117         if (err)
 118                 goto err_mtt;
 119
 120         return 0;
 121
 122 err_mtt:
 123         mlx4_mtt_cleanup(dev->dev, &buf->mtt);
 124
 125 err_buf:
 126         mlx4_buf_free(dev->dev, nent * buf->entry_size, &buf->buf);
 127
 128 out:
 129         return err;
 130 }
 131
 132 static void mlx4_ib_free_cq_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq_buf *buf, int cqe)
 133 {
 134         mlx4_buf_free(dev->dev, (cqe + 1) * buf->entry_size, &buf->buf);
 135 }
 136
 137 static int mlx4_ib_get_cq_umem(struct mlx4_ib_dev *dev, struct ib_ucontext *context,
 138                                struct mlx4_ib_cq_buf *buf, struct ib_umem **umem,
 139                                u64 buf_addr, int cqe)
 140 {
 141         int err;
 142         int cqe_size = dev->dev->caps.cqe_size;
 143
 144         *umem = ib_umem_get(context, buf_addr, cqe * cqe_size,
 145                             IB_ACCESS_LOCAL_WRITE, 1);
 146         if (IS_ERR(*umem))
 147                 return PTR_ERR(*umem);
 148
 149         err = mlx4_mtt_init(dev->dev, ib_umem_page_count(*umem),
 150                             ilog2((*umem)->page_size), &buf->mtt);
 151         if (err)
 152                 goto err_buf;
 153
 154         err = mlx4_ib_umem_write_mtt(dev, &buf->mtt, *umem);
 155         if (err)
 156                 goto err_mtt;
 157
 158         return 0;
 159
 160 err_mtt:
 161         mlx4_mtt_cleanup(dev->dev, &buf->mtt);
 162
 163 err_buf:
 164         ib_umem_release(*umem);
 165
 166         return err;
 167 }
 168
 169 struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev, int entries, int vector,
 170                                 struct ib_ucontext *context,
 171                                 struct ib_udata *udata)
 172 {
 173         struct mlx4_ib_dev *dev = to_mdev(ibdev);
 174         struct mlx4_ib_cq *cq;
 175         struct mlx4_uar *uar;
 176         int err;
 177
 178         if (entries < 1 || entries > dev->dev->caps.max_cqes)
 179                 return ERR_PTR(-EINVAL);
 180
 181         cq = kmalloc(sizeof *cq, GFP_KERNEL);
 182         if (!cq)
 183                 return ERR_PTR(-ENOMEM);
 184
 185         entries      = roundup_pow_of_two(entries + 1);
 186         cq->ibcq.cqe = entries - 1;
 187         mutex_init(&cq->resize_mutex);
 188         spin_lock_init(&cq->lock);
 189         cq->resize_buf = NULL;
 190         cq->resize_umem = NULL;
 191
 192         if (context) {
 193                 struct mlx4_ib_create_cq ucmd;
 194
 195                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 196                         err = -EFAULT;
 197                         goto err_cq;
 198                 }
 199
 200                 err = mlx4_ib_get_cq_umem(dev, context, &cq->buf, &cq->umem,
 201                                           ucmd.buf_addr, entries);
 202                 if (err)
 203                         goto err_cq;
 204
 205                 err = mlx4_ib_db_map_user(to_mucontext(context), ucmd.db_addr,
 206                                           &cq->db);
 207                 if (err)
 208                         goto err_mtt;
 209
 210                 uar = &to_mucontext(context)->uar;
 211         } else {
 212                 err = mlx4_db_alloc(dev->dev, &cq->db, 1);
 213                 if (err)
 214                         goto err_cq;
 215
 216                 cq->mcq.set_ci_db  = cq->db.db;
 217                 cq->mcq.arm_db     = cq->db.db + 1;
 218                 *cq->mcq.set_ci_db = 0;
 219                 *cq->mcq.arm_db    = 0;
 220
 221                 err = mlx4_ib_alloc_cq_buf(dev, &cq->buf, entries);
 222                 if (err)
 223                         goto err_db;
 224
 225                 uar = &dev->priv_uar;
 226         }
 227
 228         if (dev->eq_table)
 229                 vector = dev->eq_table[vector % ibdev->num_comp_vectors];
 230
 231         err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar,
 232                             cq->db.dma, &cq->mcq, vector, 0, 0);
 233         if (err)
 234                 goto err_dbmap;
 235
 236         cq->mcq.comp  = mlx4_ib_cq_comp;
 237         cq->mcq.event = mlx4_ib_cq_event;
 238
 239         if (context)
 240                 if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof (__u32))) {
 241                         err = -EFAULT;
 242                         goto err_dbmap;
 243                 }
 244
 245         return &cq->ibcq;
 246
 247 err_dbmap:
 248         if (context)
 249                 mlx4_ib_db_unmap_user(to_mucontext(context), &cq->db);
 250
 251 err_mtt:
 252         mlx4_mtt_cleanup(dev->dev, &cq->buf.mtt);
 253
 254         if (context)
 255                 ib_umem_release(cq->umem);
 256         else
 257                 mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 258
 259 err_db:
 260         if (!context)
 261                 mlx4_db_free(dev->dev, &cq->db);
 262
 263 err_cq:
 264         kfree(cq);
 265
 266         return ERR_PTR(err);
 267 }
 268
 269 static int mlx4_alloc_resize_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
 270                                   int entries)
 271 {
 272         int err;
 273
 274         if (cq->resize_buf)
 275                 return -EBUSY;
 276
 277         cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_ATOMIC);
 278         if (!cq->resize_buf)
 279                 return -ENOMEM;
 280
 281         err = mlx4_ib_alloc_cq_buf(dev, &cq->resize_buf->buf, entries);
 282         if (err) {
 283                 kfree(cq->resize_buf);
 284                 cq->resize_buf = NULL;
 285                 return err;
 286         }
 287
 288         cq->resize_buf->cqe = entries - 1;
 289
 290         return 0;
 291 }
 292
 293 static int mlx4_alloc_resize_umem(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
 294                                    int entries, struct ib_udata *udata)
 295 {
 296         struct mlx4_ib_resize_cq ucmd;
 297         int err;
 298
 299         if (cq->resize_umem)
 300                 return -EBUSY;
 301
 302         if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd))
 303                 return -EFAULT;
 304
 305         cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_ATOMIC);
 306         if (!cq->resize_buf)
 307                 return -ENOMEM;
 308
 309         err = mlx4_ib_get_cq_umem(dev, cq->umem->context, &cq->resize_buf->buf,
 310                                   &cq->resize_umem, ucmd.buf_addr, entries);
 311         if (err) {
 312                 kfree(cq->resize_buf);
 313                 cq->resize_buf = NULL;
 314                 return err;
 315         }
 316
 317         cq->resize_buf->cqe = entries - 1;
 318
 319         return 0;
 320 }
 321
 322 static int mlx4_ib_get_outstanding_cqes(struct mlx4_ib_cq *cq)
 323 {
 324         u32 i;
 325
 326         i = cq->mcq.cons_index;
 327         while (get_sw_cqe(cq, i))
 328                 ++i;
 329
 330         return i - cq->mcq.cons_index;
 331 }
 332
 333 static void mlx4_ib_cq_resize_copy_cqes(struct mlx4_ib_cq *cq)
 334 {
 335         struct mlx4_cqe *cqe, *new_cqe;
 336         int i;
 337         int cqe_size = cq->buf.entry_size;
 338         int cqe_inc = cqe_size == 64 ? 1 : 0;
 339
 340         i = cq->mcq.cons_index;
 341         cqe = get_cqe(cq, i & cq->ibcq.cqe);
 342         cqe += cqe_inc;
 343
 344         while ((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) != MLX4_CQE_OPCODE_RESIZE) {
 345                 new_cqe = get_cqe_from_buf(&cq->resize_buf->buf,
 346                                            (i + 1) & cq->resize_buf->cqe);
 347                 memcpy(new_cqe, get_cqe(cq, i & cq->ibcq.cqe), cqe_size);
 348                 new_cqe += cqe_inc;
 349
 350                 new_cqe->owner_sr_opcode = (cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK) |
 351                         (((i + 1) & (cq->resize_buf->cqe + 1)) ? MLX4_CQE_OWNER_MASK : 0);
 352                 cqe = get_cqe(cq, ++i & cq->ibcq.cqe);
 353                 cqe += cqe_inc;
 354         }
 355         ++cq->mcq.cons_index;
 356 }
 357
 358 int mlx4_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
 359 {
 360         struct mlx4_ib_dev *dev = to_mdev(ibcq->device);
 361         struct mlx4_ib_cq *cq = to_mcq(ibcq);
 362         struct mlx4_mtt mtt;
 363         int outst_cqe;
 364         int err;
 365
 366         mutex_lock(&cq->resize_mutex);
 367
 368         if (entries < 1) {
 369                 err = -EINVAL;
 370                 goto out;
 371         }
 372
 373         entries = roundup_pow_of_two(entries + 1);
 374         if (entries == ibcq->cqe + 1) {
 375                 err = 0;
 376                 goto out;
 377         }
 378
 379         if (entries > dev->dev->caps.max_cqes) {
 380                 err = -EINVAL;
 381                 goto out;
 382         }
 383
 384         if (ibcq->uobject) {
 385                 err = mlx4_alloc_resize_umem(dev, cq, entries, udata);
 386                 if (err)
 387                         goto out;
 388         } else {
 389                 /* Can't be smaller than the number of outstanding CQEs */
 390                 outst_cqe = mlx4_ib_get_outstanding_cqes(cq);
 391                 if (entries < outst_cqe + 1) {
 392                         err = 0;
 393                         goto out;
 394                 }
 395
 396                 err = mlx4_alloc_resize_buf(dev, cq, entries);
 397                 if (err)
 398                         goto out;
 399         }
 400
 401         mtt = cq->buf.mtt;
 402
 403         err = mlx4_cq_resize(dev->dev, &cq->mcq, entries, &cq->resize_buf->buf.mtt);
 404         if (err)
 405                 goto err_buf;
 406
 407         mlx4_mtt_cleanup(dev->dev, &mtt);
 408         if (ibcq->uobject) {
 409                 cq->buf      = cq->resize_buf->buf;
 410                 cq->ibcq.cqe = cq->resize_buf->cqe;
 411                 ib_umem_release(cq->umem);
 412                 cq->umem     = cq->resize_umem;
 413
 414                 kfree(cq->resize_buf);
 415                 cq->resize_buf = NULL;
 416                 cq->resize_umem = NULL;
 417         } else {
 418                 struct mlx4_ib_cq_buf tmp_buf;
 419                 int tmp_cqe = 0;
 420
 421                 spin_lock_irq(&cq->lock);
 422                 if (cq->resize_buf) {
 423                         mlx4_ib_cq_resize_copy_cqes(cq);
 424                         tmp_buf = cq->buf;
 425                         tmp_cqe = cq->ibcq.cqe;
 426                         cq->buf      = cq->resize_buf->buf;
 427                         cq->ibcq.cqe = cq->resize_buf->cqe;
 428
 429                         kfree(cq->resize_buf);
 430                         cq->resize_buf = NULL;
 431                 }
 432                 spin_unlock_irq(&cq->lock);
 433
 434                 if (tmp_cqe)
 435                         mlx4_ib_free_cq_buf(dev, &tmp_buf, tmp_cqe);
 436         }
 437
 438         goto out;
 439
 440 err_buf:
 441         mlx4_mtt_cleanup(dev->dev, &cq->resize_buf->buf.mtt);
 442         if (!ibcq->uobject)
 443                 mlx4_ib_free_cq_buf(dev, &cq->resize_buf->buf,
 444                                     cq->resize_buf->cqe);
 445
 446         kfree(cq->resize_buf);
 447         cq->resize_buf = NULL;
 448
 449         if (cq->resize_umem) {
 450                 ib_umem_release(cq->resize_umem);
 451                 cq->resize_umem = NULL;
 452         }
 453
 454 out:
 455         mutex_unlock(&cq->resize_mutex);
 456
 457         return err;
 458 }
 459
 460 int mlx4_ib_destroy_cq(struct ib_cq *cq)
 461 {
 462         struct mlx4_ib_dev *dev = to_mdev(cq->device);
 463         struct mlx4_ib_cq *mcq = to_mcq(cq);
 464
 465         mlx4_cq_free(dev->dev, &mcq->mcq);
 466         mlx4_mtt_cleanup(dev->dev, &mcq->buf.mtt);
 467
 468         if (cq->uobject) {
 469                 mlx4_ib_db_unmap_user(to_mucontext(cq->uobject->context), &mcq->db);
 470                 ib_umem_release(mcq->umem);
 471         } else {
 472                 mlx4_ib_free_cq_buf(dev, &mcq->buf, cq->cqe);
 473                 mlx4_db_free(dev->dev, &mcq->db);
 474         }
 475
 476         kfree(mcq);
 477
 478         return 0;
 479 }
 480
 481 static void dump_cqe(void *cqe)
 482 {
 483         __be32 *buf = cqe;
 484
 485         pr_debug("CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n",
 486                be32_to_cpu(buf[0]), be32_to_cpu(buf[1]), be32_to_cpu(buf[2]),
 487                be32_to_cpu(buf[3]), be32_to_cpu(buf[4]), be32_to_cpu(buf[5]),
 488                be32_to_cpu(buf[6]), be32_to_cpu(buf[7]));
 489 }
 490
 491 static void mlx4_ib_handle_error_cqe(struct mlx4_err_cqe *cqe,
 492                                      struct ib_wc *wc)
 493 {
 494         if (cqe->syndrome == MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR) {
 495                 pr_debug("local QP operation err "
 496                        "(QPN %06x, WQE index %x, vendor syndrome %02x, "
 497                        "opcode = %02x)\n",
 498                        be32_to_cpu(cqe->my_qpn), be16_to_cpu(cqe->wqe_index),
 499                        cqe->vendor_err_syndrome,
 500                        cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 501                 dump_cqe(cqe);
 502         }
 503
 504         switch (cqe->syndrome) {
 505         case MLX4_CQE_SYNDROME_LOCAL_LENGTH_ERR:
 506                 wc->status = IB_WC_LOC_LEN_ERR;
 507                 break;
 508         case MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR:
 509                 wc->status = IB_WC_LOC_QP_OP_ERR;
 510                 break;
 511         case MLX4_CQE_SYNDROME_LOCAL_PROT_ERR:
 512                 wc->status = IB_WC_LOC_PROT_ERR;
 513                 break;
 514         case MLX4_CQE_SYNDROME_WR_FLUSH_ERR:
 515                 wc->status = IB_WC_WR_FLUSH_ERR;
 516                 break;
 517         case MLX4_CQE_SYNDROME_MW_BIND_ERR:
 518                 wc->status = IB_WC_MW_BIND_ERR;
 519                 break;
 520         case MLX4_CQE_SYNDROME_BAD_RESP_ERR:
 521                 wc->status = IB_WC_BAD_RESP_ERR;
 522                 break;
 523         case MLX4_CQE_SYNDROME_LOCAL_ACCESS_ERR:
 524                 wc->status = IB_WC_LOC_ACCESS_ERR;
 525                 break;
 526         case MLX4_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
 527                 wc->status = IB_WC_REM_INV_REQ_ERR;
 528                 break;
 529         case MLX4_CQE_SYNDROME_REMOTE_ACCESS_ERR:
 530                 wc->status = IB_WC_REM_ACCESS_ERR;
 531                 break;
 532         case MLX4_CQE_SYNDROME_REMOTE_OP_ERR:
 533                 wc->status = IB_WC_REM_OP_ERR;
 534                 break;
 535         case MLX4_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
 536                 wc->status = IB_WC_RETRY_EXC_ERR;
 537                 break;
 538         case MLX4_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
 539                 wc->status = IB_WC_RNR_RETRY_EXC_ERR;
 540                 break;
 541         case MLX4_CQE_SYNDROME_REMOTE_ABORTED_ERR:
 542                 wc->status = IB_WC_REM_ABORT_ERR;
 543                 break;
 544         default:
 545                 wc->status = IB_WC_GENERAL_ERR;
 546                 break;
 547         }
 548
 549         wc->vendor_err = cqe->vendor_err_syndrome;
 550 }
 551
 552 static int mlx4_ib_ipoib_csum_ok(__be16 status, __be16 checksum)
 553 {
 554         return ((status & cpu_to_be16(MLX4_CQE_STATUS_IPV4      |
 555                                       MLX4_CQE_STATUS_IPV4F     |
 556                                       MLX4_CQE_STATUS_IPV4OPT   |
 557                                       MLX4_CQE_STATUS_IPV6      |
 558                                       MLX4_CQE_STATUS_IPOK)) ==
 559                 cpu_to_be16(MLX4_CQE_STATUS_IPV4        |
 560                             MLX4_CQE_STATUS_IPOK))              &&
 561                 (status & cpu_to_be16(MLX4_CQE_STATUS_UDP       |
 562                                       MLX4_CQE_STATUS_TCP))     &&
 563                 checksum == cpu_to_be16(0xffff);
 564 }
 565
 566 static int use_tunnel_data(struct mlx4_ib_qp *qp, struct mlx4_ib_cq *cq, struct ib_wc *wc,
 567                            unsigned tail, struct mlx4_cqe *cqe)
 568 {
 569         struct mlx4_ib_proxy_sqp_hdr *hdr;
 570
 571         ib_dma_sync_single_for_cpu(qp->ibqp.device,
 572                                    qp->sqp_proxy_rcv[tail].map,
 573                                    sizeof (struct mlx4_ib_proxy_sqp_hdr),
 574                                    DMA_FROM_DEVICE);
 575         hdr = (struct mlx4_ib_proxy_sqp_hdr *) (qp->sqp_proxy_rcv[tail].addr);
 576         wc->pkey_index  = be16_to_cpu(hdr->tun.pkey_index);
 577         wc->slid        = be16_to_cpu(hdr->tun.slid_mac_47_32);
 578         wc->sl          = (u8) (be16_to_cpu(hdr->tun.sl_vid) >> 12);
 579         wc->src_qp      = be32_to_cpu(hdr->tun.flags_src_qp) & 0xFFFFFF;
 580         wc->wc_flags   |= (hdr->tun.g_ml_path & 0x80) ? (IB_WC_GRH) : 0;
 581         wc->dlid_path_bits = 0;
 582
 583         return 0;
 584 }
 585
 586 static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
 587                             struct mlx4_ib_qp **cur_qp,
 588                             struct ib_wc *wc)
 589 {
 590         struct mlx4_cqe *cqe;
 591         struct mlx4_qp *mqp;
 592         struct mlx4_ib_wq *wq;
 593         struct mlx4_ib_srq *srq;
 594         struct mlx4_srq *msrq = NULL;
 595         int is_send;
 596         int is_error;
 597         u32 g_mlpath_rqpn;
 598         u16 wqe_ctr;
 599         unsigned tail = 0;
 600
 601 repoll:
 602         cqe = next_cqe_sw(cq);
 603         if (!cqe)
 604                 return -EAGAIN;
 605
 606         if (cq->buf.entry_size == 64)
 607                 cqe++;
 608
 609         ++cq->mcq.cons_index;
 610
 611         /*
 612          * Make sure we read CQ entry contents after we've checked the
 613          * ownership bit.
 614          */
 615         rmb();
 616
 617         is_send  = cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK;
 618         is_error = (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 619                 MLX4_CQE_OPCODE_ERROR;
 620
 621         if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_OPCODE_NOP &&
 622                      is_send)) {
 623                 pr_warn("Completion for NOP opcode detected!\n");
 624                 return -EINVAL;
 625         }
 626
 627         /* Resize CQ in progress */
 628         if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_CQE_OPCODE_RESIZE)) {
 629                 if (cq->resize_buf) {
 630                         struct mlx4_ib_dev *dev = to_mdev(cq->ibcq.device);
 631
 632                         mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 633                         cq->buf      = cq->resize_buf->buf;
 634                         cq->ibcq.cqe = cq->resize_buf->cqe;
 635
 636                         kfree(cq->resize_buf);
 637                         cq->resize_buf = NULL;
 638                 }
 639
 640                 goto repoll;
 641         }
 642
 643         if (!*cur_qp ||
 644             (be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) != (*cur_qp)->mqp.qpn) {
 645                 /*
 646                  * We do not have to take the QP table lock here,
 647                  * because CQs will be locked while QPs are removed
 648                  * from the table.
 649                  */
 650                 mqp = __mlx4_qp_lookup(to_mdev(cq->ibcq.device)->dev,
 651                                        be32_to_cpu(cqe->vlan_my_qpn));
 652                 if (unlikely(!mqp)) {
 653                         pr_warn("CQ %06x with entry for unknown QPN %06x\n",
 654                                cq->mcq.cqn, be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK);
 655                         return -EINVAL;
 656                 }
 657
 658                 *cur_qp = to_mibqp(mqp);
 659         }
 660
 661         wc->qp = &(*cur_qp)->ibqp;
 662
 663         if (wc->qp->qp_type == IB_QPT_XRC_TGT) {
 664                 u32 srq_num;
 665                 g_mlpath_rqpn = be32_to_cpu(cqe->g_mlpath_rqpn);
 666                 srq_num       = g_mlpath_rqpn & 0xffffff;
 667                 /* SRQ is also in the radix tree */
 668                 msrq = mlx4_srq_lookup(to_mdev(cq->ibcq.device)->dev,
 669                                        srq_num);
 670                 if (unlikely(!msrq)) {
 671                         pr_warn("CQ %06x with entry for unknown SRQN %06x\n",
 672                                 cq->mcq.cqn, srq_num);
 673                         return -EINVAL;
 674                 }
 675         }
 676
 677         if (is_send) {
 678                 wq = &(*cur_qp)->sq;
 679                 if (!(*cur_qp)->sq_signal_bits) {
 680                         wqe_ctr = be16_to_cpu(cqe->wqe_index);
 681                         wq->tail += (u16) (wqe_ctr - (u16) wq->tail);
 682                 }
 683                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 684                 ++wq->tail;
 685         } else if ((*cur_qp)->ibqp.srq) {
 686                 srq = to_msrq((*cur_qp)->ibqp.srq);
 687                 wqe_ctr = be16_to_cpu(cqe->wqe_index);
 688                 wc->wr_id = srq->wrid[wqe_ctr];
 689                 mlx4_ib_free_srq_wqe(srq, wqe_ctr);
 690         } else if (msrq) {
 691                 srq = to_mibsrq(msrq);
 692                 wqe_ctr = be16_to_cpu(cqe->wqe_index);
 693                 wc->wr_id = srq->wrid[wqe_ctr];
 694                 mlx4_ib_free_srq_wqe(srq, wqe_ctr);
 695         } else {
 696                 wq        = &(*cur_qp)->rq;
 697                 tail      = wq->tail & (wq->wqe_cnt - 1);
 698                 wc->wr_id = wq->wrid[tail];
 699                 ++wq->tail;
 700         }
 701
 702         if (unlikely(is_error)) {
 703                 mlx4_ib_handle_error_cqe((struct mlx4_err_cqe *) cqe, wc);
 704                 return 0;
 705         }
 706
 707         wc->status = IB_WC_SUCCESS;
 708
 709         if (is_send) {
 710                 wc->wc_flags = 0;
 711                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 712                 case MLX4_OPCODE_RDMA_WRITE_IMM:
 713                         wc->wc_flags |= IB_WC_WITH_IMM;
 714                 case MLX4_OPCODE_RDMA_WRITE:
 715                         wc->opcode    = IB_WC_RDMA_WRITE;
 716                         break;
 717                 case MLX4_OPCODE_SEND_IMM:
 718                         wc->wc_flags |= IB_WC_WITH_IMM;
 719                 case MLX4_OPCODE_SEND:
 720                 case MLX4_OPCODE_SEND_INVAL:
 721                         wc->opcode    = IB_WC_SEND;
 722                         break;
 723                 case MLX4_OPCODE_RDMA_READ:
 724                         wc->opcode    = IB_WC_RDMA_READ;
 725                         wc->byte_len  = be32_to_cpu(cqe->byte_cnt);
 726                         break;
 727                 case MLX4_OPCODE_ATOMIC_CS:
 728                         wc->opcode    = IB_WC_COMP_SWAP;
 729                         wc->byte_len  = 8;
 730                         break;
 731                 case MLX4_OPCODE_ATOMIC_FA:
 732                         wc->opcode    = IB_WC_FETCH_ADD;
 733                         wc->byte_len  = 8;
 734                         break;
 735                 case MLX4_OPCODE_MASKED_ATOMIC_CS:
 736                         wc->opcode    = IB_WC_MASKED_COMP_SWAP;
 737                         wc->byte_len  = 8;
 738                         break;
 739                 case MLX4_OPCODE_MASKED_ATOMIC_FA:
 740                         wc->opcode    = IB_WC_MASKED_FETCH_ADD;
 741                         wc->byte_len  = 8;
 742                         break;
 743                 case MLX4_OPCODE_BIND_MW:
 744                         wc->opcode    = IB_WC_BIND_MW;
 745                         break;
 746                 case MLX4_OPCODE_LSO:
 747                         wc->opcode    = IB_WC_LSO;
 748                         break;
 749                 case MLX4_OPCODE_FMR:
 750                         wc->opcode    = IB_WC_FAST_REG_MR;
 751                         break;
 752                 case MLX4_OPCODE_LOCAL_INVAL:
 753                         wc->opcode    = IB_WC_LOCAL_INV;
 754                         break;
 755                 }
 756         } else {
 757                 wc->byte_len = be32_to_cpu(cqe->byte_cnt);
 758
 759                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 760                 case MLX4_RECV_OPCODE_RDMA_WRITE_IMM:
 761                         wc->opcode      = IB_WC_RECV_RDMA_WITH_IMM;
 762                         wc->wc_flags    = IB_WC_WITH_IMM;
 763                         wc->ex.imm_data = cqe->immed_rss_invalid;
 764                         break;
 765                 case MLX4_RECV_OPCODE_SEND_INVAL:
 766                         wc->opcode      = IB_WC_RECV;
 767                         wc->wc_flags    = IB_WC_WITH_INVALIDATE;
 768                         wc->ex.invalidate_rkey = be32_to_cpu(cqe->immed_rss_invalid);
 769                         break;
 770                 case MLX4_RECV_OPCODE_SEND:
 771                         wc->opcode   = IB_WC_RECV;
 772                         wc->wc_flags = 0;
 773                         break;
 774                 case MLX4_RECV_OPCODE_SEND_IMM:
 775                         wc->opcode      = IB_WC_RECV;
 776                         wc->wc_flags    = IB_WC_WITH_IMM;
 777                         wc->ex.imm_data = cqe->immed_rss_invalid;
 778                         break;
 779                 }
 780
 781                 if (mlx4_is_mfunc(to_mdev(cq->ibcq.device)->dev)) {
 782                         if ((*cur_qp)->mlx4_ib_qp_type &
 783                             (MLX4_IB_QPT_PROXY_SMI_OWNER |
 784                              MLX4_IB_QPT_PROXY_SMI | MLX4_IB_QPT_PROXY_GSI))
 785                                 return use_tunnel_data(*cur_qp, cq, wc, tail, cqe);
 786                 }
 787
 788                 wc->slid           = be16_to_cpu(cqe->rlid);
 789                 g_mlpath_rqpn      = be32_to_cpu(cqe->g_mlpath_rqpn);
 790                 wc->src_qp         = g_mlpath_rqpn & 0xffffff;
 791                 wc->dlid_path_bits = (g_mlpath_rqpn >> 24) & 0x7f;
 792                 wc->wc_flags      |= g_mlpath_rqpn & 0x80000000 ? IB_WC_GRH : 0;
 793                 wc->pkey_index     = be32_to_cpu(cqe->immed_rss_invalid) & 0x7f;
 794                 wc->wc_flags      |= mlx4_ib_ipoib_csum_ok(cqe->status,
 795                                         cqe->checksum) ? IB_WC_IP_CSUM_OK : 0;
 796                 if (rdma_port_get_link_layer(wc->qp->device,
 797                                 (*cur_qp)->port) == IB_LINK_LAYER_ETHERNET)
 798                         wc->sl  = be16_to_cpu(cqe->sl_vid) >> 13;
 799                 else
 800                         wc->sl  = be16_to_cpu(cqe->sl_vid) >> 12;
 801                 if (be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_VLAN_PRESENT_MASK) {
 802                         wc->vlan_id = be16_to_cpu(cqe->sl_vid) &
 803                                 MLX4_CQE_VID_MASK;
 804                 } else {
 805                         wc->vlan_id = 0xffff;
 806                 }
 807                 wc->wc_flags |= IB_WC_WITH_VLAN;
 808                 memcpy(wc->smac, cqe->smac, ETH_ALEN);
 809                 wc->wc_flags |= IB_WC_WITH_SMAC;
 810         }
 811
 812         return 0;
 813 }
 814
 815 int mlx4_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 816 {
 817         struct mlx4_ib_cq *cq = to_mcq(ibcq);
 818         struct mlx4_ib_qp *cur_qp = NULL;
 819         unsigned long flags;
 820         int npolled;
 821         int err = 0;
 822
 823         spin_lock_irqsave(&cq->lock, flags);
 824
 825         for (npolled = 0; npolled < num_entries; ++npolled) {
 826                 err = mlx4_ib_poll_one(cq, &cur_qp, wc + npolled);
 827                 if (err)
 828                         break;
 829         }
 830
 831         mlx4_cq_set_ci(&cq->mcq);
 832
 833         spin_unlock_irqrestore(&cq->lock, flags);
 834
 835         if (err == 0 || err == -EAGAIN)
 836                 return npolled;
 837         else
 838                 return err;
 839 }
 840
 841 int mlx4_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
 842 {
 843         mlx4_cq_arm(&to_mcq(ibcq)->mcq,
 844                     (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
 845                     MLX4_CQ_DB_REQ_NOT_SOL : MLX4_CQ_DB_REQ_NOT,
 846                     to_mdev(ibcq->device)->uar_map,
 847                     MLX4_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->uar_lock));
 848
 849         return 0;
 850 }
 851
 852 void __mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 853 {
 854         u32 prod_index;
 855         int nfreed = 0;
 856         struct mlx4_cqe *cqe, *dest;
 857         u8 owner_bit;
 858         int cqe_inc = cq->buf.entry_size == 64 ? 1 : 0;
 859
 860         /*
 861          * First we need to find the current producer index, so we
 862          * know where to start cleaning from.  It doesn't matter if HW
 863          * adds new entries after this loop -- the QP we're worried
 864          * about is already in RESET, so the new entries won't come
 865          * from our QP and therefore don't need to be checked.
 866          */
 867         for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); ++prod_index)
 868                 if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
 869                         break;
 870
 871         /*
 872          * Now sweep backwards through the CQ, removing CQ entries
 873          * that match our QP by copying older entries on top of them.
 874          */
 875         while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
 876                 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
 877                 cqe += cqe_inc;
 878
 879                 if ((be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) == qpn) {
 880                         if (srq && !(cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK))
 881                                 mlx4_ib_free_srq_wqe(srq, be16_to_cpu(cqe->wqe_index));
 882                         ++nfreed;
 883                 } else if (nfreed) {
 884                         dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe);
 885                         dest += cqe_inc;
 886
 887                         owner_bit = dest->owner_sr_opcode & MLX4_CQE_OWNER_MASK;
 888                         memcpy(dest, cqe, sizeof *cqe);
 889                         dest->owner_sr_opcode = owner_bit |
 890                                 (dest->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 891                 }
 892         }
 893
 894         if (nfreed) {
 895                 cq->mcq.cons_index += nfreed;
 896                 /*
 897                  * Make sure update of buffer contents is done before
 898                  * updating consumer index.
 899                  */
 900                 wmb();
 901                 mlx4_cq_set_ci(&cq->mcq);
 902         }
 903 }
 904
 905 void mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 906 {
 907         spin_lock_irq(&cq->lock);
 908         __mlx4_ib_cq_clean(cq, qpn, srq);
 909         spin_unlock_irq(&cq->lock);
 910 }