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         int offset = n * sizeof (struct mlx4_cqe);
  68
  69         if (buf->buf.nbufs == 1)
  70                 return buf->buf.u.direct.buf + offset;
  71         else
  72                 return buf->buf.u.page_list[offset >> PAGE_SHIFT].buf +
  73                         (offset & (PAGE_SIZE - 1));
  74 }
  75
  76 static void *get_cqe(struct mlx4_ib_cq *cq, int n)
  77 {
  78         return get_cqe_from_buf(&cq->buf, n);
  79 }
  80
  81 static void *get_sw_cqe(struct mlx4_ib_cq *cq, int n)
  82 {
  83         struct mlx4_cqe *cqe = get_cqe(cq, n & cq->ibcq.cqe);
  84
  85         return (!!(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK) ^
  86                 !!(n & (cq->ibcq.cqe + 1))) ? NULL : cqe;
  87 }
  88
  89 static struct mlx4_cqe *next_cqe_sw(struct mlx4_ib_cq *cq)
  90 {
  91         return get_sw_cqe(cq, cq->mcq.cons_index);
  92 }
  93
  94 struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev, int entries, int vector,
  95                                 struct ib_ucontext *context,
  96                                 struct ib_udata *udata)
  97 {
  98         struct mlx4_ib_dev *dev = to_mdev(ibdev);
  99         struct mlx4_ib_cq *cq;
 100         struct mlx4_uar *uar;
 101         int buf_size;
 102         int err;
 103
 104         if (entries < 1 || entries > dev->dev->caps.max_cqes)
 105                 return ERR_PTR(-EINVAL);
 106
 107         cq = kmalloc(sizeof *cq, GFP_KERNEL);
 108         if (!cq)
 109                 return ERR_PTR(-ENOMEM);
 110
 111         entries      = roundup_pow_of_two(entries + 1);
 112         cq->ibcq.cqe = entries - 1;
 113         buf_size     = entries * sizeof (struct mlx4_cqe);
 114         spin_lock_init(&cq->lock);
 115
 116         if (context) {
 117                 struct mlx4_ib_create_cq ucmd;
 118
 119                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 120                         err = -EFAULT;
 121                         goto err_cq;
 122                 }
 123
 124                 cq->umem = ib_umem_get(context, ucmd.buf_addr, buf_size,
 125                                        IB_ACCESS_LOCAL_WRITE);
 126                 if (IS_ERR(cq->umem)) {
 127                         err = PTR_ERR(cq->umem);
 128                         goto err_cq;
 129                 }
 130
 131                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(cq->umem),
 132                                     ilog2(cq->umem->page_size), &cq->buf.mtt);
 133                 if (err)
 134                         goto err_buf;
 135
 136                 err = mlx4_ib_umem_write_mtt(dev, &cq->buf.mtt, cq->umem);
 137                 if (err)
 138                         goto err_mtt;
 139
 140                 err = mlx4_ib_db_map_user(to_mucontext(context), ucmd.db_addr,
 141                                           &cq->db);
 142                 if (err)
 143                         goto err_mtt;
 144
 145                 uar = &to_mucontext(context)->uar;
 146         } else {
 147                 err = mlx4_ib_db_alloc(dev, &cq->db, 1);
 148                 if (err)
 149                         goto err_cq;
 150
 151                 cq->mcq.set_ci_db  = cq->db.db;
 152                 cq->mcq.arm_db     = cq->db.db + 1;
 153                 *cq->mcq.set_ci_db = 0;
 154                 *cq->mcq.arm_db    = 0;
 155
 156                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &cq->buf.buf)) {
 157                         err = -ENOMEM;
 158                         goto err_db;
 159                 }
 160
 161                 err = mlx4_mtt_init(dev->dev, cq->buf.buf.npages, cq->buf.buf.page_shift,
 162                                     &cq->buf.mtt);
 163                 if (err)
 164                         goto err_buf;
 165
 166                 err = mlx4_buf_write_mtt(dev->dev, &cq->buf.mtt, &cq->buf.buf);
 167                 if (err)
 168                         goto err_mtt;
 169
 170                 uar = &dev->priv_uar;
 171         }
 172
 173         err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar,
 174                             cq->db.dma, &cq->mcq);
 175         if (err)
 176                 goto err_dbmap;
 177
 178         cq->mcq.comp  = mlx4_ib_cq_comp;
 179         cq->mcq.event = mlx4_ib_cq_event;
 180
 181         if (context)
 182                 if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof (__u32))) {
 183                         err = -EFAULT;
 184                         goto err_dbmap;
 185                 }
 186
 187         return &cq->ibcq;
 188
 189 err_dbmap:
 190         if (context)
 191                 mlx4_ib_db_unmap_user(to_mucontext(context), &cq->db);
 192
 193 err_mtt:
 194         mlx4_mtt_cleanup(dev->dev, &cq->buf.mtt);
 195
 196 err_buf:
 197         if (context)
 198                 ib_umem_release(cq->umem);
 199         else
 200                 mlx4_buf_free(dev->dev, entries * sizeof (struct mlx4_cqe),
 201                               &cq->buf.buf);
 202
 203 err_db:
 204         if (!context)
 205                 mlx4_ib_db_free(dev, &cq->db);
 206
 207 err_cq:
 208         kfree(cq);
 209
 210         return ERR_PTR(err);
 211 }
 212
 213 int mlx4_ib_destroy_cq(struct ib_cq *cq)
 214 {
 215         struct mlx4_ib_dev *dev = to_mdev(cq->device);
 216         struct mlx4_ib_cq *mcq = to_mcq(cq);
 217
 218         mlx4_cq_free(dev->dev, &mcq->mcq);
 219         mlx4_mtt_cleanup(dev->dev, &mcq->buf.mtt);
 220
 221         if (cq->uobject) {
 222                 mlx4_ib_db_unmap_user(to_mucontext(cq->uobject->context), &mcq->db);
 223                 ib_umem_release(mcq->umem);
 224         } else {
 225                 mlx4_buf_free(dev->dev, (cq->cqe + 1) * sizeof (struct mlx4_cqe),
 226                               &mcq->buf.buf);
 227                 mlx4_ib_db_free(dev, &mcq->db);
 228         }
 229
 230         kfree(mcq);
 231
 232         return 0;
 233 }
 234
 235 static void dump_cqe(void *cqe)
 236 {
 237         __be32 *buf = cqe;
 238
 239         printk(KERN_DEBUG "CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n",
 240                be32_to_cpu(buf[0]), be32_to_cpu(buf[1]), be32_to_cpu(buf[2]),
 241                be32_to_cpu(buf[3]), be32_to_cpu(buf[4]), be32_to_cpu(buf[5]),
 242                be32_to_cpu(buf[6]), be32_to_cpu(buf[7]));
 243 }
 244
 245 static void mlx4_ib_handle_error_cqe(struct mlx4_err_cqe *cqe,
 246                                      struct ib_wc *wc)
 247 {
 248         if (cqe->syndrome == MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR) {
 249                 printk(KERN_DEBUG "local QP operation err "
 250                        "(QPN %06x, WQE index %x, vendor syndrome %02x, "
 251                        "opcode = %02x)\n",
 252                        be32_to_cpu(cqe->my_qpn), be16_to_cpu(cqe->wqe_index),
 253                        cqe->vendor_err_syndrome,
 254                        cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 255                 dump_cqe(cqe);
 256         }
 257
 258         switch (cqe->syndrome) {
 259         case MLX4_CQE_SYNDROME_LOCAL_LENGTH_ERR:
 260                 wc->status = IB_WC_LOC_LEN_ERR;
 261                 break;
 262         case MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR:
 263                 wc->status = IB_WC_LOC_QP_OP_ERR;
 264                 break;
 265         case MLX4_CQE_SYNDROME_LOCAL_PROT_ERR:
 266                 wc->status = IB_WC_LOC_PROT_ERR;
 267                 break;
 268         case MLX4_CQE_SYNDROME_WR_FLUSH_ERR:
 269                 wc->status = IB_WC_WR_FLUSH_ERR;
 270                 break;
 271         case MLX4_CQE_SYNDROME_MW_BIND_ERR:
 272                 wc->status = IB_WC_MW_BIND_ERR;
 273                 break;
 274         case MLX4_CQE_SYNDROME_BAD_RESP_ERR:
 275                 wc->status = IB_WC_BAD_RESP_ERR;
 276                 break;
 277         case MLX4_CQE_SYNDROME_LOCAL_ACCESS_ERR:
 278                 wc->status = IB_WC_LOC_ACCESS_ERR;
 279                 break;
 280         case MLX4_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
 281                 wc->status = IB_WC_REM_INV_REQ_ERR;
 282                 break;
 283         case MLX4_CQE_SYNDROME_REMOTE_ACCESS_ERR:
 284                 wc->status = IB_WC_REM_ACCESS_ERR;
 285                 break;
 286         case MLX4_CQE_SYNDROME_REMOTE_OP_ERR:
 287                 wc->status = IB_WC_REM_OP_ERR;
 288                 break;
 289         case MLX4_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
 290                 wc->status = IB_WC_RETRY_EXC_ERR;
 291                 break;
 292         case MLX4_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
 293                 wc->status = IB_WC_RNR_RETRY_EXC_ERR;
 294                 break;
 295         case MLX4_CQE_SYNDROME_REMOTE_ABORTED_ERR:
 296                 wc->status = IB_WC_REM_ABORT_ERR;
 297                 break;
 298         default:
 299                 wc->status = IB_WC_GENERAL_ERR;
 300                 break;
 301         }
 302
 303         wc->vendor_err = cqe->vendor_err_syndrome;
 304 }
 305
 306 static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
 307                             struct mlx4_ib_qp **cur_qp,
 308                             struct ib_wc *wc)
 309 {
 310         struct mlx4_cqe *cqe;
 311         struct mlx4_qp *mqp;
 312         struct mlx4_ib_wq *wq;
 313         struct mlx4_ib_srq *srq;
 314         int is_send;
 315         int is_error;
 316         u16 wqe_ctr;
 317
 318         cqe = next_cqe_sw(cq);
 319         if (!cqe)
 320                 return -EAGAIN;
 321
 322         ++cq->mcq.cons_index;
 323
 324         /*
 325          * Make sure we read CQ entry contents after we've checked the
 326          * ownership bit.
 327          */
 328         rmb();
 329
 330         is_send  = cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK;
 331         is_error = (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 332                 MLX4_CQE_OPCODE_ERROR;
 333
 334         if (!*cur_qp ||
 335             (be32_to_cpu(cqe->my_qpn) & 0xffffff) != (*cur_qp)->mqp.qpn) {
 336                 /*
 337                  * We do not have to take the QP table lock here,
 338                  * because CQs will be locked while QPs are removed
 339                  * from the table.
 340                  */
 341                 mqp = __mlx4_qp_lookup(to_mdev(cq->ibcq.device)->dev,
 342                                        be32_to_cpu(cqe->my_qpn));
 343                 if (unlikely(!mqp)) {
 344                         printk(KERN_WARNING "CQ %06x with entry for unknown QPN %06x\n",
 345                                cq->mcq.cqn, be32_to_cpu(cqe->my_qpn) & 0xffffff);
 346                         return -EINVAL;
 347                 }
 348
 349                 *cur_qp = to_mibqp(mqp);
 350         }
 351
 352         wc->qp = &(*cur_qp)->ibqp;
 353
 354         if (is_send) {
 355                 wq = &(*cur_qp)->sq;
 356                 wqe_ctr = be16_to_cpu(cqe->wqe_index);
 357                 wq->tail += (u16) (wqe_ctr - (u16) wq->tail);
 358                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 359                 ++wq->tail;
 360         } else if ((*cur_qp)->ibqp.srq) {
 361                 srq = to_msrq((*cur_qp)->ibqp.srq);
 362                 wqe_ctr = be16_to_cpu(cqe->wqe_index);
 363                 wc->wr_id = srq->wrid[wqe_ctr];
 364                 mlx4_ib_free_srq_wqe(srq, wqe_ctr);
 365         } else {
 366                 wq        = &(*cur_qp)->rq;
 367                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 368                 ++wq->tail;
 369         }
 370
 371         if (unlikely(is_error)) {
 372                 mlx4_ib_handle_error_cqe((struct mlx4_err_cqe *) cqe, wc);
 373                 return 0;
 374         }
 375
 376         wc->status = IB_WC_SUCCESS;
 377
 378         if (is_send) {
 379                 wc->wc_flags = 0;
 380                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 381                 case MLX4_OPCODE_RDMA_WRITE_IMM:
 382                         wc->wc_flags |= IB_WC_WITH_IMM;
 383                 case MLX4_OPCODE_RDMA_WRITE:
 384                         wc->opcode    = IB_WC_RDMA_WRITE;
 385                         break;
 386                 case MLX4_OPCODE_SEND_IMM:
 387                         wc->wc_flags |= IB_WC_WITH_IMM;
 388                 case MLX4_OPCODE_SEND:
 389                         wc->opcode    = IB_WC_SEND;
 390                         break;
 391                 case MLX4_OPCODE_RDMA_READ:
 392                         wc->opcode    = IB_WC_RDMA_READ;
 393                         wc->byte_len  = be32_to_cpu(cqe->byte_cnt);
 394                         break;
 395                 case MLX4_OPCODE_ATOMIC_CS:
 396                         wc->opcode    = IB_WC_COMP_SWAP;
 397                         wc->byte_len  = 8;
 398                         break;
 399                 case MLX4_OPCODE_ATOMIC_FA:
 400                         wc->opcode    = IB_WC_FETCH_ADD;
 401                         wc->byte_len  = 8;
 402                         break;
 403                 case MLX4_OPCODE_BIND_MW:
 404                         wc->opcode    = IB_WC_BIND_MW;
 405                         break;
 406                 }
 407         } else {
 408                 wc->byte_len = be32_to_cpu(cqe->byte_cnt);
 409
 410                 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
 411                 case MLX4_RECV_OPCODE_RDMA_WRITE_IMM:
 412                         wc->opcode   = IB_WC_RECV_RDMA_WITH_IMM;
 413                         wc->wc_flags = IB_WC_WITH_IMM;
 414                         wc->imm_data = cqe->immed_rss_invalid;
 415                         break;
 416                 case MLX4_RECV_OPCODE_SEND:
 417                         wc->opcode   = IB_WC_RECV;
 418                         wc->wc_flags = 0;
 419                         break;
 420                 case MLX4_RECV_OPCODE_SEND_IMM:
 421                         wc->opcode   = IB_WC_RECV;
 422                         wc->wc_flags = IB_WC_WITH_IMM;
 423                         wc->imm_data = cqe->immed_rss_invalid;
 424                         break;
 425                 }
 426
 427                 wc->slid           = be16_to_cpu(cqe->rlid);
 428                 wc->sl             = cqe->sl >> 4;
 429                 wc->src_qp         = be32_to_cpu(cqe->g_mlpath_rqpn) & 0xffffff;
 430                 wc->dlid_path_bits = (be32_to_cpu(cqe->g_mlpath_rqpn) >> 24) & 0x7f;
 431                 wc->wc_flags      |= be32_to_cpu(cqe->g_mlpath_rqpn) & 0x80000000 ?
 432                         IB_WC_GRH : 0;
 433                 wc->pkey_index     = be32_to_cpu(cqe->immed_rss_invalid) & 0x7f;
 434         }
 435
 436         return 0;
 437 }
 438
 439 int mlx4_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 440 {
 441         struct mlx4_ib_cq *cq = to_mcq(ibcq);
 442         struct mlx4_ib_qp *cur_qp = NULL;
 443         unsigned long flags;
 444         int npolled;
 445         int err = 0;
 446
 447         spin_lock_irqsave(&cq->lock, flags);
 448
 449         for (npolled = 0; npolled < num_entries; ++npolled) {
 450                 err = mlx4_ib_poll_one(cq, &cur_qp, wc + npolled);
 451                 if (err)
 452                         break;
 453         }
 454
 455         if (npolled)
 456                 mlx4_cq_set_ci(&cq->mcq);
 457
 458         spin_unlock_irqrestore(&cq->lock, flags);
 459
 460         if (err == 0 || err == -EAGAIN)
 461                 return npolled;
 462         else
 463                 return err;
 464 }
 465
 466 int mlx4_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
 467 {
 468         mlx4_cq_arm(&to_mcq(ibcq)->mcq,
 469                     (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
 470                     MLX4_CQ_DB_REQ_NOT_SOL : MLX4_CQ_DB_REQ_NOT,
 471                     to_mdev(ibcq->device)->uar_map,
 472                     MLX4_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->uar_lock));
 473
 474         return 0;
 475 }
 476
 477 void __mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 478 {
 479         u32 prod_index;
 480         int nfreed = 0;
 481         struct mlx4_cqe *cqe, *dest;
 482         u8 owner_bit;
 483
 484         /*
 485          * First we need to find the current producer index, so we
 486          * know where to start cleaning from.  It doesn't matter if HW
 487          * adds new entries after this loop -- the QP we're worried
 488          * about is already in RESET, so the new entries won't come
 489          * from our QP and therefore don't need to be checked.
 490          */
 491         for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); ++prod_index)
 492                 if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
 493                         break;
 494
 495         /*
 496          * Now sweep backwards through the CQ, removing CQ entries
 497          * that match our QP by copying older entries on top of them.
 498          */
 499         while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
 500                 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
 501                 if ((be32_to_cpu(cqe->my_qpn) & 0xffffff) == qpn) {
 502                         if (srq && !(cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK))
 503                                 mlx4_ib_free_srq_wqe(srq, be16_to_cpu(cqe->wqe_index));
 504                         ++nfreed;
 505                 } else if (nfreed) {
 506                         dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe);
 507                         owner_bit = dest->owner_sr_opcode & MLX4_CQE_OWNER_MASK;
 508                         memcpy(dest, cqe, sizeof *cqe);
 509                         dest->owner_sr_opcode = owner_bit |
 510                                 (dest->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
 511                 }
 512         }
 513
 514         if (nfreed) {
 515                 cq->mcq.cons_index += nfreed;
 516                 /*
 517                  * Make sure update of buffer contents is done before
 518                  * updating consumer index.
 519                  */
 520                 wmb();
 521                 mlx4_cq_set_ci(&cq->mcq);
 522         }
 523 }
 524
 525 void mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
 526 {
 527         spin_lock_irq(&cq->lock);
 528         __mlx4_ib_cq_clean(cq, qpn, srq);
 529         spin_unlock_irq(&cq->lock);
 530 }