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 <rdma/mlx4-abi.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, GFP_KERNEL);
 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, GFP_KERNEL);
 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 #define CQ_CREATE_FLAGS_SUPPORTED IB_CQ_FLAGS_TIMESTAMP_COMPLETION
 170 struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev,
 171                                 const struct ib_cq_init_attr *attr,
 172                                 struct ib_ucontext *context,
 173                                 struct ib_udata *udata)
 174 {
 175         int entries = attr->cqe;
 176         int vector = attr->comp_vector;
 177         struct mlx4_ib_dev *dev = to_mdev(ibdev);
 178         struct mlx4_ib_cq *cq;
 179         struct mlx4_uar *uar;
 180         int err;
 181
 182         if (entries < 1 || entries > dev->dev->caps.max_cqes)
 183                 return ERR_PTR(-EINVAL);
 184
 185         if (attr->flags & ~CQ_CREATE_FLAGS_SUPPORTED)
 186                 return ERR_PTR(-EINVAL);
 187
 188         cq = kmalloc(sizeof *cq, GFP_KERNEL);
 189         if (!cq)
 190                 return ERR_PTR(-ENOMEM);
 191
 192         entries      = roundup_pow_of_two(entries + 1);
 193         cq->ibcq.cqe = entries - 1;
 194         mutex_init(&cq->resize_mutex);
 195         spin_lock_init(&cq->lock);
 196         cq->resize_buf = NULL;
 197         cq->resize_umem = NULL;
 198         cq->create_flags = attr->flags;
 199         INIT_LIST_HEAD(&cq->send_qp_list);
 200         INIT_LIST_HEAD(&cq->recv_qp_list);
 201
 202         if (context) {
 203                 struct mlx4_ib_create_cq ucmd;
 204
 205                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 206                         err = -EFAULT;
 207                         goto err_cq;
 208                 }
 209
 210                 err = mlx4_ib_get_cq_umem(dev, context, &cq->buf, &cq->umem,
 211                                           ucmd.buf_addr, entries);
 212                 if (err)
 213                         goto err_cq;
 214
 215                 err = mlx4_ib_db_map_user(to_mucontext(context), ucmd.db_addr,
 216                                           &cq->db);
 217                 if (err)
 218                         goto err_mtt;
 219
 220                 uar = &to_mucontext(context)->uar;
 221         } else {
 222                 err = mlx4_db_alloc(dev->dev, &cq->db, 1, GFP_KERNEL);
 223                 if (err)
 224                         goto err_cq;
 225
 226                 cq->mcq.set_ci_db  = cq->db.db;
 227                 cq->mcq.arm_db     = cq->db.db + 1;
 228                 *cq->mcq.set_ci_db = 0;
 229                 *cq->mcq.arm_db    = 0;
 230
 231                 err = mlx4_ib_alloc_cq_buf(dev, &cq->buf, entries);
 232                 if (err)
 233                         goto err_db;
 234
 235                 uar = &dev->priv_uar;
 236         }
 237
 238         if (dev->eq_table)
 239                 vector = dev->eq_table[vector % ibdev->num_comp_vectors];
 240
 241         err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar,
 242                             cq->db.dma, &cq->mcq, vector, 0,
 243                             !!(cq->create_flags & IB_CQ_FLAGS_TIMESTAMP_COMPLETION));
 244         if (err)
 245                 goto err_dbmap;
 246
 247         if (context)
 248                 cq->mcq.tasklet_ctx.comp = mlx4_ib_cq_comp;
 249         else
 250                 cq->mcq.comp = mlx4_ib_cq_comp;
 251         cq->mcq.event = mlx4_ib_cq_event;
 252
 253         if (context)
 254                 if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof (__u32))) {
 255                         err = -EFAULT;
 256                         goto err_dbmap;
 257                 }
 258
 259         return &cq->ibcq;
 260
 261 err_dbmap:
 262         if (context)
 263                 mlx4_ib_db_unmap_user(to_mucontext(context), &cq->db);
 264
 265 err_mtt:
 266         mlx4_mtt_cleanup(dev->dev, &cq->buf.mtt);
 267
 268         if (context)
 269                 ib_umem_release(cq->umem);
 270         else
 271                 mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 272
 273 err_db:
 274         if (!context)
 275                 mlx4_db_free(dev->dev, &cq->db);
 276
 277 err_cq:
 278         kfree(cq);
 279
 280         return ERR_PTR(err);
 281 }
 282
 283 static int mlx4_alloc_resize_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
 284                                   int entries)
 285 {
 286         int err;
 287
 288         if (cq->resize_buf)
 289                 return -EBUSY;
 290
 291         cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_KERNEL);
 292         if (!cq->resize_buf)
 293                 return -ENOMEM;
 294
 295         err = mlx4_ib_alloc_cq_buf(dev, &cq->resize_buf->buf, entries);
 296         if (err) {
 297                 kfree(cq->resize_buf);
 298                 cq->resize_buf = NULL;
 299                 return err;
 300         }
 301
 302         cq->resize_buf->cqe = entries - 1;
 303
 304         return 0;
 305 }
 306
 307 static int mlx4_alloc_resize_umem(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
 308                                    int entries, struct ib_udata *udata)
 309 {
 310         struct mlx4_ib_resize_cq ucmd;
 311         int err;
 312
 313         if (cq->resize_umem)
 314                 return -EBUSY;
 315
 316         if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd))
 317                 return -EFAULT;
 318
 319         cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_KERNEL);
 320         if (!cq->resize_buf)
 321                 return -ENOMEM;
 322
 323         err = mlx4_ib_get_cq_umem(dev, cq->umem->context, &cq->resize_buf->buf,
 324                                   &cq->resize_umem, ucmd.buf_addr, entries);
 325         if (err) {
 326                 kfree(cq->resize_buf);
 327                 cq->resize_buf = NULL;
 328                 return err;
 329         }
 330
 331         cq->resize_buf->cqe = entries - 1;
 332
 333         return 0;
 334 }
 335
 336 static int mlx4_ib_get_outstanding_cqes(struct mlx4_ib_cq *cq)
 337 {
 338         u32 i;
 339
 340         i = cq->mcq.cons_index;
 341         while (get_sw_cqe(cq, i))
 342                 ++i;
 343
 344         return i - cq->mcq.cons_index;
 345 }
 346
 347 static void mlx4_ib_cq_resize_copy_cqes(struct mlx4_ib_cq *cq)
 348 {
 349         struct mlx4_cqe *cqe, *new_cqe;
 350         int i;
 351         int cqe_size = cq->buf.entry_size;
 352         int cqe_inc = cqe_size == 64 ? 1 : 0;
 353
 354         i = cq->mcq.cons_index;
 355         cqe = get_cqe(cq, i & cq->ibcq.cqe);
 356         cqe += cqe_inc;
 357
 358         while ((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) != MLX4_CQE_OPCODE_RESIZE) {
 359                 new_cqe = get_cqe_from_buf(&cq->resize_buf->buf,
 360                                            (i + 1) & cq->resize_buf->cqe);
 361                 memcpy(new_cqe, get_cqe(cq, i & cq->ibcq.cqe), cqe_size);
 362                 new_cqe += cqe_inc;
 363
 364                 new_cqe->owner_sr_opcode = (cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK) |
 365                         (((i + 1) & (cq->resize_buf->cqe + 1)) ? MLX4_CQE_OWNER_MASK : 0);
 366                 cqe = get_cqe(cq, ++i & cq->ibcq.cqe);
 367                 cqe += cqe_inc;
 368         }
 369         ++cq->mcq.cons_index;
 370 }
 371
 372 int mlx4_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
 373 {
 374         struct mlx4_ib_dev *dev = to_mdev(ibcq->device);
 375         struct mlx4_ib_cq *cq = to_mcq(ibcq);
 376         struct mlx4_mtt mtt;
 377         int outst_cqe;
 378         int err;
 379
 380         mutex_lock(&cq->resize_mutex);
 381         if (entries < 1 || entries > dev->dev->caps.max_cqes) {
 382                 err = -EINVAL;
 383                 goto out;
 384         }
 385
 386         entries = roundup_pow_of_two(entries + 1);
 387         if (entries == ibcq->cqe + 1) {
 388                 err = 0;
 389                 goto out;
 390         }
 391
 392         if (entries > dev->dev->caps.max_cqes + 1) {
 393                 err = -EINVAL;
 394                 goto out;
 395         }
 396
 397         if (ibcq->uobject) {
 398                 err = mlx4_alloc_resize_umem(dev, cq, entries, udata);
 399                 if (err)
 400                         goto out;
 401         } else {
 402                 /* Can't be smaller than the number of outstanding CQEs */
 403                 outst_cqe = mlx4_ib_get_outstanding_cqes(cq);
 404                 if (entries < outst_cqe + 1) {
 405                         err = -EINVAL;
 406                         goto out;
 407                 }
 408
 409                 err = mlx4_alloc_resize_buf(dev, cq, entries);
 410                 if (err)
 411                         goto out;
 412         }
 413
 414         mtt = cq->buf.mtt;
 415
 416         err = mlx4_cq_resize(dev->dev, &cq->mcq, entries, &cq->resize_buf->buf.mtt);
 417         if (err)
 418                 goto err_buf;
 419
 420         mlx4_mtt_cleanup(dev->dev, &mtt);
 421         if (ibcq->uobject) {
 422                 cq->buf      = cq->resize_buf->buf;
 423                 cq->ibcq.cqe = cq->resize_buf->cqe;
 424                 ib_umem_release(cq->umem);
 425                 cq->umem     = cq->resize_umem;
 426
 427                 kfree(cq->resize_buf);
 428                 cq->resize_buf = NULL;
 429                 cq->resize_umem = NULL;
 430         } else {
 431                 struct mlx4_ib_cq_buf tmp_buf;
 432                 int tmp_cqe = 0;
 433
 434                 spin_lock_irq(&cq->lock);
 435                 if (cq->resize_buf) {
 436                         mlx4_ib_cq_resize_copy_cqes(cq);
 437                         tmp_buf = cq->buf;
 438                         tmp_cqe = cq->ibcq.cqe;
 439                         cq->buf      = cq->resize_buf->buf;
 440                         cq->ibcq.cqe = cq->resize_buf->cqe;
 441
 442                         kfree(cq->resize_buf);
 443                         cq->resize_buf = NULL;
 444                 }
 445                 spin_unlock_irq(&cq->lock);
 446
 447                 if (tmp_cqe)
 448                         mlx4_ib_free_cq_buf(dev, &tmp_buf, tmp_cqe);
 449         }
 450
 451         goto out;
 452
 453 err_buf:
 454         mlx4_mtt_cleanup(dev->dev, &cq->resize_buf->buf.mtt);
 455         if (!ibcq->uobject)
 456                 mlx4_ib_free_cq_buf(dev, &cq->resize_buf->buf,
 457                                     cq->resize_buf->cqe);
 458
 459         kfree(cq->resize_buf);
 460         cq->resize_buf = NULL;
 461
 462         if (cq->resize_umem) {
 463                 ib_umem_release(cq->resize_umem);
 464                 cq->resize_umem = NULL;
 465         }
 466
 467 out:
 468         mutex_unlock(&cq->resize_mutex);
 469
 470         return err;
 471 }
 472
 473 int mlx4_ib_destroy_cq(struct ib_cq *cq)
 474 {
 475         struct mlx4_ib_dev *dev = to_mdev(cq->device);
 476         struct mlx4_ib_cq *mcq = to_mcq(cq);
 477
 478         mlx4_cq_free(dev->dev, &mcq->mcq);
 479         mlx4_mtt_cleanup(dev->dev, &mcq->buf.mtt);
 480
 481         if (cq->uobject) {
 482                 mlx4_ib_db_unmap_user(to_mucontext(cq->uobject->context), &mcq->db);
 483                 ib_umem_release(mcq->umem);
 484         } else {
 485                 mlx4_ib_free_cq_buf(dev, &mcq->buf, cq->cqe);
 486                 mlx4_db_free(dev->dev, &mcq->db);
 487         }
 488
 489         kfree(mcq);
 490
 491         return 0;
 492 }
 493
 494 static void dump_cqe(void *cqe)
 495 {
 496         __be32 *buf = cqe;
 497
 498         pr_debug("CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n",
 499                be32_to_cpu(buf[0]), be32_to_cpu(buf[1]), be32_to_cpu(buf[2]),
 500                be32_to_cpu(buf[3]), be32_to_cpu(buf[4]), be32_to_cpu(buf[5]),
 501                be32_to_cpu(buf[6]), be32_to_cpu(buf[7]));
 502 }
 503
 504 static void mlx4_ib_handle_error_cqe(struct mlx4_err_cqe *cqe,
 505                                      struct ib_wc *wc)
 506 {
 507         if (cqe->syndrome == MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR) {
 508                 pr_debug("local QP operation err "
 509                        "(QPN %06x, WQE index %x, vendor syndrome %02x, "
 510                        "opcode = %02x)\n",
 511                        be32_to_cpu(cqe->my_qpn), be16_to_cpu(cqe->wqe_index),
 512                        cqe->vendor_err_syndrome,
 513                        cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 514                 dump_cqe(cqe);
 515         }
 516
 517         switch (cqe->syndrome) {
 518         case MLX4_CQE_SYNDROME_LOCAL_LENGTH_ERR:
 519                 wc->status = IB_WC_LOC_LEN_ERR;
 520                 break;
 521         case MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR:
 522                 wc->status = IB_WC_LOC_QP_OP_ERR;
 523                 break;
 524         case MLX4_CQE_SYNDROME_LOCAL_PROT_ERR:
 525                 wc->status = IB_WC_LOC_PROT_ERR;
 526                 break;
 527         case MLX4_CQE_SYNDROME_WR_FLUSH_ERR:
 528                 wc->status = IB_WC_WR_FLUSH_ERR;
 529                 break;
 530         case MLX4_CQE_SYNDROME_MW_BIND_ERR:
 531                 wc->status = IB_WC_MW_BIND_ERR;
 532                 break;
 533         case MLX4_CQE_SYNDROME_BAD_RESP_ERR:
 534                 wc->status = IB_WC_BAD_RESP_ERR;
 535                 break;
 536         case MLX4_CQE_SYNDROME_LOCAL_ACCESS_ERR:
 537                 wc->status = IB_WC_LOC_ACCESS_ERR;
 538                 break;
 539         case MLX4_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
 540                 wc->status = IB_WC_REM_INV_REQ_ERR;
 541                 break;
 542         case MLX4_CQE_SYNDROME_REMOTE_ACCESS_ERR:
 543                 wc->status = IB_WC_REM_ACCESS_ERR;
 544                 break;
 545         case MLX4_CQE_SYNDROME_REMOTE_OP_ERR:
 546                 wc->status = IB_WC_REM_OP_ERR;
 547                 break;
 548         case MLX4_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
 549                 wc->status = IB_WC_RETRY_EXC_ERR;
 550                 break;
 551         case MLX4_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
 552                 wc->status = IB_WC_RNR_RETRY_EXC_ERR;
 553                 break;
 554         case MLX4_CQE_SYNDROME_REMOTE_ABORTED_ERR:
 555                 wc->status = IB_WC_REM_ABORT_ERR;
 556                 break;
 557         default:
 558                 wc->status = IB_WC_GENERAL_ERR;
 559                 break;
 560         }
 561
 562         wc->vendor_err = cqe->vendor_err_syndrome;
 563 }
 564
 565 static int mlx4_ib_ipoib_csum_ok(__be16 status, __be16 checksum)
 566 {
 567         return ((status & cpu_to_be16(MLX4_CQE_STATUS_IPV4      |
 568                                       MLX4_CQE_STATUS_IPV4F     |
 569                                       MLX4_CQE_STATUS_IPV4OPT   |
 570                                       MLX4_CQE_STATUS_IPV6      |
 571                                       MLX4_CQE_STATUS_IPOK)) ==
 572                 cpu_to_be16(MLX4_CQE_STATUS_IPV4        |
 573                             MLX4_CQE_STATUS_IPOK))              &&
 574                 (status & cpu_to_be16(MLX4_CQE_STATUS_UDP       |
 575                                       MLX4_CQE_STATUS_TCP))     &&
 576                 checksum == cpu_to_be16(0xffff);
 577 }
 578
 579 static int use_tunnel_data(struct mlx4_ib_qp *qp, struct mlx4_ib_cq *cq, struct ib_wc *wc,
 580                            unsigned tail, struct mlx4_cqe *cqe, int is_eth)
 581 {
 582         struct mlx4_ib_proxy_sqp_hdr *hdr;
 583
 584         ib_dma_sync_single_for_cpu(qp->ibqp.device,
 585                                    qp->sqp_proxy_rcv[tail].map,
 586                                    sizeof (struct mlx4_ib_proxy_sqp_hdr),
 587                                    DMA_FROM_DEVICE);
 588         hdr = (struct mlx4_ib_proxy_sqp_hdr *) (qp->sqp_proxy_rcv[tail].addr);
 589         wc->pkey_index  = be16_to_cpu(hdr->tun.pkey_index);
 590         wc->src_qp      = be32_to_cpu(hdr->tun.flags_src_qp) & 0xFFFFFF;
 591         wc->wc_flags   |= (hdr->tun.g_ml_path & 0x80) ? (IB_WC_GRH) : 0;
 592         wc->dlid_path_bits = 0;
 593
 594         if (is_eth) {
 595                 wc->vlan_id = be16_to_cpu(hdr->tun.sl_vid);
 596                 memcpy(&(wc->smac[0]), (char *)&hdr->tun.mac_31_0, 4);
 597                 memcpy(&(wc->smac[4]), (char *)&hdr->tun.slid_mac_47_32, 2);
 598                 wc->wc_flags |= (IB_WC_WITH_VLAN | IB_WC_WITH_SMAC);
 599         } else {
 600                 wc->slid        = be16_to_cpu(hdr->tun.slid_mac_47_32);
 601                 wc->sl          = (u8) (be16_to_cpu(hdr->tun.sl_vid) >> 12);
 602         }
 603
 604         return 0;
 605 }
 606
 607 static void mlx4_ib_qp_sw_comp(struct mlx4_ib_qp *qp, int num_entries,
 608                                struct ib_wc *wc, int *npolled, int is_send)
 609 {
 610         struct mlx4_ib_wq *wq;
 611         unsigned cur;
 612         int i;
 613
 614         wq = is_send ? &qp->sq : &qp->rq;
 615         cur = wq->head - wq->tail;
 616
 617         if (cur == 0)
 618                 return;
 619
 620         for (i = 0;  i < cur && *npolled < num_entries; i++) {
 621                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 622                 wc->status = IB_WC_WR_FLUSH_ERR;
 623                 wc->vendor_err = MLX4_CQE_SYNDROME_WR_FLUSH_ERR;
 624                 wq->tail++;
 625                 (*npolled)++;
 626                 wc->qp = &qp->ibqp;
 627                 wc++;
 628         }
 629 }
 630
 631 static void mlx4_ib_poll_sw_comp(struct mlx4_ib_cq *cq, int num_entries,
 632                                  struct ib_wc *wc, int *npolled)
 633 {
 634         struct mlx4_ib_qp *qp;
 635
 636         *npolled = 0;
 637         /* Find uncompleted WQEs belonging to that cq and retrun
 638          * simulated FLUSH_ERR completions
 639          */
 640         list_for_each_entry(qp, &cq->send_qp_list, cq_send_list) {
 641                 mlx4_ib_qp_sw_comp(qp, num_entries, wc + *npolled, npolled, 1);
 642                 if (*npolled >= num_entries)
 643                         goto out;
 644         }
 645
 646         list_for_each_entry(qp, &cq->recv_qp_list, cq_recv_list) {
 647                 mlx4_ib_qp_sw_comp(qp, num_entries, wc + *npolled, npolled, 0);
 648                 if (*npolled >= num_entries)
 649                         goto out;
 650         }
 651
 652 out:
 653         return;
 654 }
 655
 656 static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
 657                             struct mlx4_ib_qp **cur_qp,
 658                             struct ib_wc *wc)
 659 {
 660         struct mlx4_cqe *cqe;
 661         struct mlx4_qp *mqp;
 662         struct mlx4_ib_wq *wq;
 663         struct mlx4_ib_srq *srq;
 664         struct mlx4_srq *msrq = NULL;
 665         int is_send;
 666         int is_error;
 667         int is_eth;
 668         u32 g_mlpath_rqpn;
 669         u16 wqe_ctr;
 670         unsigned tail = 0;
 671
 672 repoll:
 673         cqe = next_cqe_sw(cq);
 674         if (!cqe)
 675                 return -EAGAIN;
 676
 677         if (cq->buf.entry_size == 64)
 678                 cqe++;
 679
 680         ++cq->mcq.cons_index;
 681
 682         /*
 683          * Make sure we read CQ entry contents after we've checked the
 684          * ownership bit.
 685          */
 686         rmb();
 687
 688         is_send  = cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK;
 689         is_error = (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 690                 MLX4_CQE_OPCODE_ERROR;
 691
 692         if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_OPCODE_NOP &&
 693                      is_send)) {
 694                 pr_warn("Completion for NOP opcode detected!\n");
 695                 return -EINVAL;
 696         }
 697
 698         /* Resize CQ in progress */
 699         if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_CQE_OPCODE_RESIZE)) {
 700                 if (cq->resize_buf) {
 701                         struct mlx4_ib_dev *dev = to_mdev(cq->ibcq.device);
 702
 703                         mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 704                         cq->buf      = cq->resize_buf->buf;
 705                         cq->ibcq.cqe = cq->resize_buf->cqe;
 706
 707                         kfree(cq->resize_buf);
 708                         cq->resize_buf = NULL;
 709                 }
 710
 711                 goto repoll;
 712         }
 713
 714         if (!*cur_qp ||
 715             (be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) != (*cur_qp)->mqp.qpn) {
 716                 /*
 717                  * We do not have to take the QP table lock here,
 718                  * because CQs will be locked while QPs are removed
 719                  * from the table.
 720                  */
 721                 mqp = __mlx4_qp_lookup(to_mdev(cq->ibcq.device)->dev,
 722                                        be32_to_cpu(cqe->vlan_my_qpn));
 723                 if (unlikely(!mqp)) {
 724                         pr_warn("CQ %06x with entry for unknown QPN %06x\n",
 725                                cq->mcq.cqn, be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK);
 726                         return -EINVAL;
 727                 }
 728
 729                 *cur_qp = to_mibqp(mqp);
 730         }
 731
 732         wc->qp = &(*cur_qp)->ibqp;
 733
 734         if (wc->qp->qp_type == IB_QPT_XRC_TGT) {
 735                 u32 srq_num;
 736                 g_mlpath_rqpn = be32_to_cpu(cqe->g_mlpath_rqpn);
 737                 srq_num       = g_mlpath_rqpn & 0xffffff;
 738                 /* SRQ is also in the radix tree */
 739                 msrq = mlx4_srq_lookup(to_mdev(cq->ibcq.device)->dev,
 740                                        srq_num);
 741                 if (unlikely(!msrq)) {
 742                         pr_warn("CQ %06x with entry for unknown SRQN %06x\n",
 743                                 cq->mcq.cqn, srq_num);
 744                         return -EINVAL;
 745                 }
 746         }
 747
 748         if (is_send) {
 749                 wq = &(*cur_qp)->sq;
 750                 if (!(*cur_qp)->sq_signal_bits) {
 751                         wqe_ctr = be16_to_cpu(cqe->wqe_index);
 752                         wq->tail += (u16) (wqe_ctr - (u16) wq->tail);
 753                 }
 754                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 755                 ++wq->tail;
 756         } else if ((*cur_qp)->ibqp.srq) {
 757                 srq = to_msrq((*cur_qp)->ibqp.srq);
 758                 wqe_ctr = be16_to_cpu(cqe->wqe_index);
 759                 wc->wr_id = srq->wrid[wqe_ctr];
 760                 mlx4_ib_free_srq_wqe(srq, wqe_ctr);
 761         } else if (msrq) {
 762                 srq = to_mibsrq(msrq);
 763                 wqe_ctr = be16_to_cpu(cqe->wqe_index);
 764                 wc->wr_id = srq->wrid[wqe_ctr];
 765                 mlx4_ib_free_srq_wqe(srq, wqe_ctr);
 766         } else {
 767                 wq        = &(*cur_qp)->rq;
 768                 tail      = wq->tail & (wq->wqe_cnt - 1);
 769                 wc->wr_id = wq->wrid[tail];
 770                 ++wq->tail;
 771         }
 772
 773         if (unlikely(is_error)) {
 774                 mlx4_ib_handle_error_cqe((struct mlx4_err_cqe *) cqe, wc);
 775                 return 0;
 776         }
 777
 778         wc->status = IB_WC_SUCCESS;
 779
 780         if (is_send) {
 781                 wc->wc_flags = 0;
 782                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 783                 case MLX4_OPCODE_RDMA_WRITE_IMM:
 784                         wc->wc_flags |= IB_WC_WITH_IMM;
 785                 case MLX4_OPCODE_RDMA_WRITE:
 786                         wc->opcode    = IB_WC_RDMA_WRITE;
 787                         break;
 788                 case MLX4_OPCODE_SEND_IMM:
 789                         wc->wc_flags |= IB_WC_WITH_IMM;
 790                 case MLX4_OPCODE_SEND:
 791                 case MLX4_OPCODE_SEND_INVAL:
 792                         wc->opcode    = IB_WC_SEND;
 793                         break;
 794                 case MLX4_OPCODE_RDMA_READ:
 795                         wc->opcode    = IB_WC_RDMA_READ;
 796                         wc->byte_len  = be32_to_cpu(cqe->byte_cnt);
 797                         break;
 798                 case MLX4_OPCODE_ATOMIC_CS:
 799                         wc->opcode    = IB_WC_COMP_SWAP;
 800                         wc->byte_len  = 8;
 801                         break;
 802                 case MLX4_OPCODE_ATOMIC_FA:
 803                         wc->opcode    = IB_WC_FETCH_ADD;
 804                         wc->byte_len  = 8;
 805                         break;
 806                 case MLX4_OPCODE_MASKED_ATOMIC_CS:
 807                         wc->opcode    = IB_WC_MASKED_COMP_SWAP;
 808                         wc->byte_len  = 8;
 809                         break;
 810                 case MLX4_OPCODE_MASKED_ATOMIC_FA:
 811                         wc->opcode    = IB_WC_MASKED_FETCH_ADD;
 812                         wc->byte_len  = 8;
 813                         break;
 814                 case MLX4_OPCODE_LSO:
 815                         wc->opcode    = IB_WC_LSO;
 816                         break;
 817                 case MLX4_OPCODE_FMR:
 818                         wc->opcode    = IB_WC_REG_MR;
 819                         break;
 820                 case MLX4_OPCODE_LOCAL_INVAL:
 821                         wc->opcode    = IB_WC_LOCAL_INV;
 822                         break;
 823                 }
 824         } else {
 825                 wc->byte_len = be32_to_cpu(cqe->byte_cnt);
 826
 827                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 828                 case MLX4_RECV_OPCODE_RDMA_WRITE_IMM:
 829                         wc->opcode      = IB_WC_RECV_RDMA_WITH_IMM;
 830                         wc->wc_flags    = IB_WC_WITH_IMM;
 831                         wc->ex.imm_data = cqe->immed_rss_invalid;
 832                         break;
 833                 case MLX4_RECV_OPCODE_SEND_INVAL:
 834                         wc->opcode      = IB_WC_RECV;
 835                         wc->wc_flags    = IB_WC_WITH_INVALIDATE;
 836                         wc->ex.invalidate_rkey = be32_to_cpu(cqe->immed_rss_invalid);
 837                         break;
 838                 case MLX4_RECV_OPCODE_SEND:
 839                         wc->opcode   = IB_WC_RECV;
 840                         wc->wc_flags = 0;
 841                         break;
 842                 case MLX4_RECV_OPCODE_SEND_IMM:
 843                         wc->opcode      = IB_WC_RECV;
 844                         wc->wc_flags    = IB_WC_WITH_IMM;
 845                         wc->ex.imm_data = cqe->immed_rss_invalid;
 846                         break;
 847                 }
 848
 849                 is_eth = (rdma_port_get_link_layer(wc->qp->device,
 850                                                   (*cur_qp)->port) ==
 851                           IB_LINK_LAYER_ETHERNET);
 852                 if (mlx4_is_mfunc(to_mdev(cq->ibcq.device)->dev)) {
 853                         if ((*cur_qp)->mlx4_ib_qp_type &
 854                             (MLX4_IB_QPT_PROXY_SMI_OWNER |
 855                              MLX4_IB_QPT_PROXY_SMI | MLX4_IB_QPT_PROXY_GSI))
 856                                 return use_tunnel_data(*cur_qp, cq, wc, tail,
 857                                                        cqe, is_eth);
 858                 }
 859
 860                 wc->slid           = be16_to_cpu(cqe->rlid);
 861                 g_mlpath_rqpn      = be32_to_cpu(cqe->g_mlpath_rqpn);
 862                 wc->src_qp         = g_mlpath_rqpn & 0xffffff;
 863                 wc->dlid_path_bits = (g_mlpath_rqpn >> 24) & 0x7f;
 864                 wc->wc_flags      |= g_mlpath_rqpn & 0x80000000 ? IB_WC_GRH : 0;
 865                 wc->pkey_index     = be32_to_cpu(cqe->immed_rss_invalid) & 0x7f;
 866                 wc->wc_flags      |= mlx4_ib_ipoib_csum_ok(cqe->status,
 867                                         cqe->checksum) ? IB_WC_IP_CSUM_OK : 0;
 868                 if (is_eth) {
 869                         wc->sl  = be16_to_cpu(cqe->sl_vid) >> 13;
 870                         if (be32_to_cpu(cqe->vlan_my_qpn) &
 871                                         MLX4_CQE_CVLAN_PRESENT_MASK) {
 872                                 wc->vlan_id = be16_to_cpu(cqe->sl_vid) &
 873                                         MLX4_CQE_VID_MASK;
 874                         } else {
 875                                 wc->vlan_id = 0xffff;
 876                         }
 877                         memcpy(wc->smac, cqe->smac, ETH_ALEN);
 878                         wc->wc_flags |= (IB_WC_WITH_VLAN | IB_WC_WITH_SMAC);
 879                 } else {
 880                         wc->sl  = be16_to_cpu(cqe->sl_vid) >> 12;
 881                         wc->vlan_id = 0xffff;
 882                 }
 883         }
 884
 885         return 0;
 886 }
 887
 888 int mlx4_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 889 {
 890         struct mlx4_ib_cq *cq = to_mcq(ibcq);
 891         struct mlx4_ib_qp *cur_qp = NULL;
 892         unsigned long flags;
 893         int npolled;
 894         int err = 0;
 895         struct mlx4_ib_dev *mdev = to_mdev(cq->ibcq.device);
 896
 897         spin_lock_irqsave(&cq->lock, flags);
 898         if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
 899                 mlx4_ib_poll_sw_comp(cq, num_entries, wc, &npolled);
 900                 goto out;
 901         }
 902
 903         for (npolled = 0; npolled < num_entries; ++npolled) {
 904                 err = mlx4_ib_poll_one(cq, &cur_qp, wc + npolled);
 905                 if (err)
 906                         break;
 907         }
 908
 909         mlx4_cq_set_ci(&cq->mcq);
 910
 911 out:
 912         spin_unlock_irqrestore(&cq->lock, flags);
 913
 914         if (err == 0 || err == -EAGAIN)
 915                 return npolled;
 916         else
 917                 return err;
 918 }
 919
 920 int mlx4_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
 921 {
 922         mlx4_cq_arm(&to_mcq(ibcq)->mcq,
 923                     (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
 924                     MLX4_CQ_DB_REQ_NOT_SOL : MLX4_CQ_DB_REQ_NOT,
 925                     to_mdev(ibcq->device)->uar_map,
 926                     MLX4_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->uar_lock));
 927
 928         return 0;
 929 }
 930
 931 void __mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 932 {
 933         u32 prod_index;
 934         int nfreed = 0;
 935         struct mlx4_cqe *cqe, *dest;
 936         u8 owner_bit;
 937         int cqe_inc = cq->buf.entry_size == 64 ? 1 : 0;
 938
 939         /*
 940          * First we need to find the current producer index, so we
 941          * know where to start cleaning from.  It doesn't matter if HW
 942          * adds new entries after this loop -- the QP we're worried
 943          * about is already in RESET, so the new entries won't come
 944          * from our QP and therefore don't need to be checked.
 945          */
 946         for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); ++prod_index)
 947                 if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
 948                         break;
 949
 950         /*
 951          * Now sweep backwards through the CQ, removing CQ entries
 952          * that match our QP by copying older entries on top of them.
 953          */
 954         while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
 955                 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
 956                 cqe += cqe_inc;
 957
 958                 if ((be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) == qpn) {
 959                         if (srq && !(cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK))
 960                                 mlx4_ib_free_srq_wqe(srq, be16_to_cpu(cqe->wqe_index));
 961                         ++nfreed;
 962                 } else if (nfreed) {
 963                         dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe);
 964                         dest += cqe_inc;
 965
 966                         owner_bit = dest->owner_sr_opcode & MLX4_CQE_OWNER_MASK;
 967                         memcpy(dest, cqe, sizeof *cqe);
 968                         dest->owner_sr_opcode = owner_bit |
 969                                 (dest->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 970                 }
 971         }
 972
 973         if (nfreed) {
 974                 cq->mcq.cons_index += nfreed;
 975                 /*
 976                  * Make sure update of buffer contents is done before
 977                  * updating consumer index.
 978                  */
 979                 wmb();
 980                 mlx4_cq_set_ci(&cq->mcq);
 981         }
 982 }
 983
 984 void mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 985 {
 986         spin_lock_irq(&cq->lock);
 987         __mlx4_ib_cq_clean(cq, qpn, srq);
 988         spin_unlock_irq(&cq->lock);
 989 }