drivers/infiniband/hw/mlx5/cq.c

   1 /*
   2  * Copyright (c) 2013-2015, Mellanox Technologies. 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/kref.h>
  34 #include <rdma/ib_umem.h>
  35 #include <rdma/ib_user_verbs.h>
  36 #include <rdma/ib_cache.h>
  37 #include "mlx5_ib.h"
  38
  39 static void mlx5_ib_cq_comp(struct mlx5_core_cq *cq)
  40 {
  41         struct ib_cq *ibcq = &to_mibcq(cq)->ibcq;
  42
  43         ibcq->comp_handler(ibcq, ibcq->cq_context);
  44 }
  45
  46 static void mlx5_ib_cq_event(struct mlx5_core_cq *mcq, enum mlx5_event type)
  47 {
  48         struct mlx5_ib_cq *cq = container_of(mcq, struct mlx5_ib_cq, mcq);
  49         struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
  50         struct ib_cq *ibcq = &cq->ibcq;
  51         struct ib_event event;
  52
  53         if (type != MLX5_EVENT_TYPE_CQ_ERROR) {
  54                 mlx5_ib_warn(dev, "Unexpected event type %d on CQ %06x\n",
  55                              type, mcq->cqn);
  56                 return;
  57         }
  58
  59         if (ibcq->event_handler) {
  60                 event.device     = &dev->ib_dev;
  61                 event.event      = IB_EVENT_CQ_ERR;
  62                 event.element.cq = ibcq;
  63                 ibcq->event_handler(&event, ibcq->cq_context);
  64         }
  65 }
  66
  67 static void *get_cqe(struct mlx5_ib_cq *cq, int n)
  68 {
  69         return mlx5_frag_buf_get_wqe(&cq->buf.fbc, n);
  70 }
  71
  72 static u8 sw_ownership_bit(int n, int nent)
  73 {
  74         return (n & nent) ? 1 : 0;
  75 }
  76
  77 static void *get_sw_cqe(struct mlx5_ib_cq *cq, int n)
  78 {
  79         void *cqe = get_cqe(cq, n & cq->ibcq.cqe);
  80         struct mlx5_cqe64 *cqe64;
  81
  82         cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64;
  83
  84         if (likely((cqe64->op_own) >> 4 != MLX5_CQE_INVALID) &&
  85             !((cqe64->op_own & MLX5_CQE_OWNER_MASK) ^ !!(n & (cq->ibcq.cqe + 1)))) {
  86                 return cqe;
  87         } else {
  88                 return NULL;
  89         }
  90 }
  91
  92 static void *next_cqe_sw(struct mlx5_ib_cq *cq)
  93 {
  94         return get_sw_cqe(cq, cq->mcq.cons_index);
  95 }
  96
  97 static enum ib_wc_opcode get_umr_comp(struct mlx5_ib_wq *wq, int idx)
  98 {
  99         switch (wq->wr_data[idx]) {
 100         case MLX5_IB_WR_UMR:
 101                 return 0;
 102
 103         case IB_WR_LOCAL_INV:
 104                 return IB_WC_LOCAL_INV;
 105
 106         case IB_WR_REG_MR:
 107                 return IB_WC_REG_MR;
 108
 109         default:
 110                 pr_warn("unknown completion status\n");
 111                 return 0;
 112         }
 113 }
 114
 115 static void handle_good_req(struct ib_wc *wc, struct mlx5_cqe64 *cqe,
 116                             struct mlx5_ib_wq *wq, int idx)
 117 {
 118         wc->wc_flags = 0;
 119         switch (be32_to_cpu(cqe->sop_drop_qpn) >> 24) {
 120         case MLX5_OPCODE_RDMA_WRITE_IMM:
 121                 wc->wc_flags |= IB_WC_WITH_IMM;
 122                 /* fall through */
 123         case MLX5_OPCODE_RDMA_WRITE:
 124                 wc->opcode    = IB_WC_RDMA_WRITE;
 125                 break;
 126         case MLX5_OPCODE_SEND_IMM:
 127                 wc->wc_flags |= IB_WC_WITH_IMM;
 128                 /* fall through */
 129         case MLX5_OPCODE_SEND:
 130         case MLX5_OPCODE_SEND_INVAL:
 131                 wc->opcode    = IB_WC_SEND;
 132                 break;
 133         case MLX5_OPCODE_RDMA_READ:
 134                 wc->opcode    = IB_WC_RDMA_READ;
 135                 wc->byte_len  = be32_to_cpu(cqe->byte_cnt);
 136                 break;
 137         case MLX5_OPCODE_ATOMIC_CS:
 138                 wc->opcode    = IB_WC_COMP_SWAP;
 139                 wc->byte_len  = 8;
 140                 break;
 141         case MLX5_OPCODE_ATOMIC_FA:
 142                 wc->opcode    = IB_WC_FETCH_ADD;
 143                 wc->byte_len  = 8;
 144                 break;
 145         case MLX5_OPCODE_ATOMIC_MASKED_CS:
 146                 wc->opcode    = IB_WC_MASKED_COMP_SWAP;
 147                 wc->byte_len  = 8;
 148                 break;
 149         case MLX5_OPCODE_ATOMIC_MASKED_FA:
 150                 wc->opcode    = IB_WC_MASKED_FETCH_ADD;
 151                 wc->byte_len  = 8;
 152                 break;
 153         case MLX5_OPCODE_UMR:
 154                 wc->opcode = get_umr_comp(wq, idx);
 155                 break;
 156         }
 157 }
 158
 159 enum {
 160         MLX5_GRH_IN_BUFFER = 1,
 161         MLX5_GRH_IN_CQE    = 2,
 162 };
 163
 164 static void handle_responder(struct ib_wc *wc, struct mlx5_cqe64 *cqe,
 165                              struct mlx5_ib_qp *qp)
 166 {
 167         enum rdma_link_layer ll = rdma_port_get_link_layer(qp->ibqp.device, 1);
 168         struct mlx5_ib_dev *dev = to_mdev(qp->ibqp.device);
 169         struct mlx5_ib_srq *srq;
 170         struct mlx5_ib_wq *wq;
 171         u16 wqe_ctr;
 172         u8  roce_packet_type;
 173         bool vlan_present;
 174         u8 g;
 175
 176         if (qp->ibqp.srq || qp->ibqp.xrcd) {
 177                 struct mlx5_core_srq *msrq = NULL;
 178
 179                 if (qp->ibqp.xrcd) {
 180                         msrq = mlx5_core_get_srq(dev->mdev,
 181                                                  be32_to_cpu(cqe->srqn));
 182                         srq = to_mibsrq(msrq);
 183                 } else {
 184                         srq = to_msrq(qp->ibqp.srq);
 185                 }
 186                 if (srq) {
 187                         wqe_ctr = be16_to_cpu(cqe->wqe_counter);
 188                         wc->wr_id = srq->wrid[wqe_ctr];
 189                         mlx5_ib_free_srq_wqe(srq, wqe_ctr);
 190                         if (msrq && atomic_dec_and_test(&msrq->refcount))
 191                                 complete(&msrq->free);
 192                 }
 193         } else {
 194                 wq        = &qp->rq;
 195                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 196                 ++wq->tail;
 197         }
 198         wc->byte_len = be32_to_cpu(cqe->byte_cnt);
 199
 200         switch (cqe->op_own >> 4) {
 201         case MLX5_CQE_RESP_WR_IMM:
 202                 wc->opcode      = IB_WC_RECV_RDMA_WITH_IMM;
 203                 wc->wc_flags    = IB_WC_WITH_IMM;
 204                 wc->ex.imm_data = cqe->imm_inval_pkey;
 205                 break;
 206         case MLX5_CQE_RESP_SEND:
 207                 wc->opcode   = IB_WC_RECV;
 208                 wc->wc_flags = IB_WC_IP_CSUM_OK;
 209                 if (unlikely(!((cqe->hds_ip_ext & CQE_L3_OK) &&
 210                                (cqe->hds_ip_ext & CQE_L4_OK))))
 211                         wc->wc_flags = 0;
 212                 break;
 213         case MLX5_CQE_RESP_SEND_IMM:
 214                 wc->opcode      = IB_WC_RECV;
 215                 wc->wc_flags    = IB_WC_WITH_IMM;
 216                 wc->ex.imm_data = cqe->imm_inval_pkey;
 217                 break;
 218         case MLX5_CQE_RESP_SEND_INV:
 219                 wc->opcode      = IB_WC_RECV;
 220                 wc->wc_flags    = IB_WC_WITH_INVALIDATE;
 221                 wc->ex.invalidate_rkey = be32_to_cpu(cqe->imm_inval_pkey);
 222                 break;
 223         }
 224         wc->src_qp         = be32_to_cpu(cqe->flags_rqpn) & 0xffffff;
 225         wc->dlid_path_bits = cqe->ml_path;
 226         g = (be32_to_cpu(cqe->flags_rqpn) >> 28) & 3;
 227         wc->wc_flags |= g ? IB_WC_GRH : 0;
 228         if (unlikely(is_qp1(qp->ibqp.qp_type))) {
 229                 u16 pkey = be32_to_cpu(cqe->imm_inval_pkey) & 0xffff;
 230
 231                 ib_find_cached_pkey(&dev->ib_dev, qp->port, pkey,
 232                                     &wc->pkey_index);
 233         } else {
 234                 wc->pkey_index = 0;
 235         }
 236
 237         if (ll != IB_LINK_LAYER_ETHERNET) {
 238                 wc->slid = be16_to_cpu(cqe->slid);
 239                 wc->sl = (be32_to_cpu(cqe->flags_rqpn) >> 24) & 0xf;
 240                 return;
 241         }
 242
 243         wc->slid = 0;
 244         vlan_present = cqe->l4_l3_hdr_type & 0x1;
 245         roce_packet_type   = (be32_to_cpu(cqe->flags_rqpn) >> 24) & 0x3;
 246         if (vlan_present) {
 247                 wc->vlan_id = (be16_to_cpu(cqe->vlan_info)) & 0xfff;
 248                 wc->sl = (be16_to_cpu(cqe->vlan_info) >> 13) & 0x7;
 249                 wc->wc_flags |= IB_WC_WITH_VLAN;
 250         } else {
 251                 wc->sl = 0;
 252         }
 253
 254         switch (roce_packet_type) {
 255         case MLX5_CQE_ROCE_L3_HEADER_TYPE_GRH:
 256                 wc->network_hdr_type = RDMA_NETWORK_IB;
 257                 break;
 258         case MLX5_CQE_ROCE_L3_HEADER_TYPE_IPV6:
 259                 wc->network_hdr_type = RDMA_NETWORK_IPV6;
 260                 break;
 261         case MLX5_CQE_ROCE_L3_HEADER_TYPE_IPV4:
 262                 wc->network_hdr_type = RDMA_NETWORK_IPV4;
 263                 break;
 264         }
 265         wc->wc_flags |= IB_WC_WITH_NETWORK_HDR_TYPE;
 266 }
 267
 268 static void dump_cqe(struct mlx5_ib_dev *dev, struct mlx5_err_cqe *cqe)
 269 {
 270         mlx5_ib_warn(dev, "dump error cqe\n");
 271         mlx5_dump_err_cqe(dev->mdev, cqe);
 272 }
 273
 274 static void mlx5_handle_error_cqe(struct mlx5_ib_dev *dev,
 275                                   struct mlx5_err_cqe *cqe,
 276                                   struct ib_wc *wc)
 277 {
 278         int dump = 1;
 279
 280         switch (cqe->syndrome) {
 281         case MLX5_CQE_SYNDROME_LOCAL_LENGTH_ERR:
 282                 wc->status = IB_WC_LOC_LEN_ERR;
 283                 break;
 284         case MLX5_CQE_SYNDROME_LOCAL_QP_OP_ERR:
 285                 wc->status = IB_WC_LOC_QP_OP_ERR;
 286                 break;
 287         case MLX5_CQE_SYNDROME_LOCAL_PROT_ERR:
 288                 wc->status = IB_WC_LOC_PROT_ERR;
 289                 break;
 290         case MLX5_CQE_SYNDROME_WR_FLUSH_ERR:
 291                 dump = 0;
 292                 wc->status = IB_WC_WR_FLUSH_ERR;
 293                 break;
 294         case MLX5_CQE_SYNDROME_MW_BIND_ERR:
 295                 wc->status = IB_WC_MW_BIND_ERR;
 296                 break;
 297         case MLX5_CQE_SYNDROME_BAD_RESP_ERR:
 298                 wc->status = IB_WC_BAD_RESP_ERR;
 299                 break;
 300         case MLX5_CQE_SYNDROME_LOCAL_ACCESS_ERR:
 301                 wc->status = IB_WC_LOC_ACCESS_ERR;
 302                 break;
 303         case MLX5_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
 304                 wc->status = IB_WC_REM_INV_REQ_ERR;
 305                 break;
 306         case MLX5_CQE_SYNDROME_REMOTE_ACCESS_ERR:
 307                 wc->status = IB_WC_REM_ACCESS_ERR;
 308                 break;
 309         case MLX5_CQE_SYNDROME_REMOTE_OP_ERR:
 310                 wc->status = IB_WC_REM_OP_ERR;
 311                 break;
 312         case MLX5_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
 313                 wc->status = IB_WC_RETRY_EXC_ERR;
 314                 dump = 0;
 315                 break;
 316         case MLX5_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
 317                 wc->status = IB_WC_RNR_RETRY_EXC_ERR;
 318                 dump = 0;
 319                 break;
 320         case MLX5_CQE_SYNDROME_REMOTE_ABORTED_ERR:
 321                 wc->status = IB_WC_REM_ABORT_ERR;
 322                 break;
 323         default:
 324                 wc->status = IB_WC_GENERAL_ERR;
 325                 break;
 326         }
 327
 328         wc->vendor_err = cqe->vendor_err_synd;
 329         if (dump)
 330                 dump_cqe(dev, cqe);
 331 }
 332
 333 static int is_atomic_response(struct mlx5_ib_qp *qp, uint16_t idx)
 334 {
 335         /* TBD: waiting decision
 336         */
 337         return 0;
 338 }
 339
 340 static void *mlx5_get_atomic_laddr(struct mlx5_ib_qp *qp, uint16_t idx)
 341 {
 342         struct mlx5_wqe_data_seg *dpseg;
 343         void *addr;
 344
 345         dpseg = mlx5_get_send_wqe(qp, idx) + sizeof(struct mlx5_wqe_ctrl_seg) +
 346                 sizeof(struct mlx5_wqe_raddr_seg) +
 347                 sizeof(struct mlx5_wqe_atomic_seg);
 348         addr = (void *)(unsigned long)be64_to_cpu(dpseg->addr);
 349         return addr;
 350 }
 351
 352 static void handle_atomic(struct mlx5_ib_qp *qp, struct mlx5_cqe64 *cqe64,
 353                           uint16_t idx)
 354 {
 355         void *addr;
 356         int byte_count;
 357         int i;
 358
 359         if (!is_atomic_response(qp, idx))
 360                 return;
 361
 362         byte_count = be32_to_cpu(cqe64->byte_cnt);
 363         addr = mlx5_get_atomic_laddr(qp, idx);
 364
 365         if (byte_count == 4) {
 366                 *(uint32_t *)addr = be32_to_cpu(*((__be32 *)addr));
 367         } else {
 368                 for (i = 0; i < byte_count; i += 8) {
 369                         *(uint64_t *)addr = be64_to_cpu(*((__be64 *)addr));
 370                         addr += 8;
 371                 }
 372         }
 373
 374         return;
 375 }
 376
 377 static void handle_atomics(struct mlx5_ib_qp *qp, struct mlx5_cqe64 *cqe64,
 378                            u16 tail, u16 head)
 379 {
 380         u16 idx;
 381
 382         do {
 383                 idx = tail & (qp->sq.wqe_cnt - 1);
 384                 handle_atomic(qp, cqe64, idx);
 385                 if (idx == head)
 386                         break;
 387
 388                 tail = qp->sq.w_list[idx].next;
 389         } while (1);
 390         tail = qp->sq.w_list[idx].next;
 391         qp->sq.last_poll = tail;
 392 }
 393
 394 static void free_cq_buf(struct mlx5_ib_dev *dev, struct mlx5_ib_cq_buf *buf)
 395 {
 396         mlx5_frag_buf_free(dev->mdev, &buf->frag_buf);
 397 }
 398
 399 static void get_sig_err_item(struct mlx5_sig_err_cqe *cqe,
 400                              struct ib_sig_err *item)
 401 {
 402         u16 syndrome = be16_to_cpu(cqe->syndrome);
 403
 404 #define GUARD_ERR   (1 << 13)
 405 #define APPTAG_ERR  (1 << 12)
 406 #define REFTAG_ERR  (1 << 11)
 407
 408         if (syndrome & GUARD_ERR) {
 409                 item->err_type = IB_SIG_BAD_GUARD;
 410                 item->expected = be32_to_cpu(cqe->expected_trans_sig) >> 16;
 411                 item->actual = be32_to_cpu(cqe->actual_trans_sig) >> 16;
 412         } else
 413         if (syndrome & REFTAG_ERR) {
 414                 item->err_type = IB_SIG_BAD_REFTAG;
 415                 item->expected = be32_to_cpu(cqe->expected_reftag);
 416                 item->actual = be32_to_cpu(cqe->actual_reftag);
 417         } else
 418         if (syndrome & APPTAG_ERR) {
 419                 item->err_type = IB_SIG_BAD_APPTAG;
 420                 item->expected = be32_to_cpu(cqe->expected_trans_sig) & 0xffff;
 421                 item->actual = be32_to_cpu(cqe->actual_trans_sig) & 0xffff;
 422         } else {
 423                 pr_err("Got signature completion error with bad syndrome %04x\n",
 424                        syndrome);
 425         }
 426
 427         item->sig_err_offset = be64_to_cpu(cqe->err_offset);
 428         item->key = be32_to_cpu(cqe->mkey);
 429 }
 430
 431 static void sw_send_comp(struct mlx5_ib_qp *qp, int num_entries,
 432                          struct ib_wc *wc, int *npolled)
 433 {
 434         struct mlx5_ib_wq *wq;
 435         unsigned int cur;
 436         unsigned int idx;
 437         int np;
 438         int i;
 439
 440         wq = &qp->sq;
 441         cur = wq->head - wq->tail;
 442         np = *npolled;
 443
 444         if (cur == 0)
 445                 return;
 446
 447         for (i = 0;  i < cur && np < num_entries; i++) {
 448                 idx = wq->last_poll & (wq->wqe_cnt - 1);
 449                 wc->wr_id = wq->wrid[idx];
 450                 wc->status = IB_WC_WR_FLUSH_ERR;
 451                 wc->vendor_err = MLX5_CQE_SYNDROME_WR_FLUSH_ERR;
 452                 wq->tail++;
 453                 np++;
 454                 wc->qp = &qp->ibqp;
 455                 wc++;
 456                 wq->last_poll = wq->w_list[idx].next;
 457         }
 458         *npolled = np;
 459 }
 460
 461 static void sw_recv_comp(struct mlx5_ib_qp *qp, int num_entries,
 462                          struct ib_wc *wc, int *npolled)
 463 {
 464         struct mlx5_ib_wq *wq;
 465         unsigned int cur;
 466         int np;
 467         int i;
 468
 469         wq = &qp->rq;
 470         cur = wq->head - wq->tail;
 471         np = *npolled;
 472
 473         if (cur == 0)
 474                 return;
 475
 476         for (i = 0;  i < cur && np < num_entries; i++) {
 477                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 478                 wc->status = IB_WC_WR_FLUSH_ERR;
 479                 wc->vendor_err = MLX5_CQE_SYNDROME_WR_FLUSH_ERR;
 480                 wq->tail++;
 481                 np++;
 482                 wc->qp = &qp->ibqp;
 483                 wc++;
 484         }
 485         *npolled = np;
 486 }
 487
 488 static void mlx5_ib_poll_sw_comp(struct mlx5_ib_cq *cq, int num_entries,
 489                                  struct ib_wc *wc, int *npolled)
 490 {
 491         struct mlx5_ib_qp *qp;
 492
 493         *npolled = 0;
 494         /* Find uncompleted WQEs belonging to that cq and return mmics ones */
 495         list_for_each_entry(qp, &cq->list_send_qp, cq_send_list) {
 496                 sw_send_comp(qp, num_entries, wc + *npolled, npolled);
 497                 if (*npolled >= num_entries)
 498                         return;
 499         }
 500
 501         list_for_each_entry(qp, &cq->list_recv_qp, cq_recv_list) {
 502                 sw_recv_comp(qp, num_entries, wc + *npolled, npolled);
 503                 if (*npolled >= num_entries)
 504                         return;
 505         }
 506 }
 507
 508 static int mlx5_poll_one(struct mlx5_ib_cq *cq,
 509                          struct mlx5_ib_qp **cur_qp,
 510                          struct ib_wc *wc)
 511 {
 512         struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
 513         struct mlx5_err_cqe *err_cqe;
 514         struct mlx5_cqe64 *cqe64;
 515         struct mlx5_core_qp *mqp;
 516         struct mlx5_ib_wq *wq;
 517         struct mlx5_sig_err_cqe *sig_err_cqe;
 518         struct mlx5_core_mkey *mmkey;
 519         struct mlx5_ib_mr *mr;
 520         uint8_t opcode;
 521         uint32_t qpn;
 522         u16 wqe_ctr;
 523         void *cqe;
 524         int idx;
 525
 526 repoll:
 527         cqe = next_cqe_sw(cq);
 528         if (!cqe)
 529                 return -EAGAIN;
 530
 531         cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64;
 532
 533         ++cq->mcq.cons_index;
 534
 535         /* Make sure we read CQ entry contents after we've checked the
 536          * ownership bit.
 537          */
 538         rmb();
 539
 540         opcode = cqe64->op_own >> 4;
 541         if (unlikely(opcode == MLX5_CQE_RESIZE_CQ)) {
 542                 if (likely(cq->resize_buf)) {
 543                         free_cq_buf(dev, &cq->buf);
 544                         cq->buf = *cq->resize_buf;
 545                         kfree(cq->resize_buf);
 546                         cq->resize_buf = NULL;
 547                         goto repoll;
 548                 } else {
 549                         mlx5_ib_warn(dev, "unexpected resize cqe\n");
 550                 }
 551         }
 552
 553         qpn = ntohl(cqe64->sop_drop_qpn) & 0xffffff;
 554         if (!*cur_qp || (qpn != (*cur_qp)->ibqp.qp_num)) {
 555                 /* We do not have to take the QP table lock here,
 556                  * because CQs will be locked while QPs are removed
 557                  * from the table.
 558                  */
 559                 mqp = __mlx5_qp_lookup(dev->mdev, qpn);
 560                 *cur_qp = to_mibqp(mqp);
 561         }
 562
 563         wc->qp  = &(*cur_qp)->ibqp;
 564         switch (opcode) {
 565         case MLX5_CQE_REQ:
 566                 wq = &(*cur_qp)->sq;
 567                 wqe_ctr = be16_to_cpu(cqe64->wqe_counter);
 568                 idx = wqe_ctr & (wq->wqe_cnt - 1);
 569                 handle_good_req(wc, cqe64, wq, idx);
 570                 handle_atomics(*cur_qp, cqe64, wq->last_poll, idx);
 571                 wc->wr_id = wq->wrid[idx];
 572                 wq->tail = wq->wqe_head[idx] + 1;
 573                 wc->status = IB_WC_SUCCESS;
 574                 break;
 575         case MLX5_CQE_RESP_WR_IMM:
 576         case MLX5_CQE_RESP_SEND:
 577         case MLX5_CQE_RESP_SEND_IMM:
 578         case MLX5_CQE_RESP_SEND_INV:
 579                 handle_responder(wc, cqe64, *cur_qp);
 580                 wc->status = IB_WC_SUCCESS;
 581                 break;
 582         case MLX5_CQE_RESIZE_CQ:
 583                 break;
 584         case MLX5_CQE_REQ_ERR:
 585         case MLX5_CQE_RESP_ERR:
 586                 err_cqe = (struct mlx5_err_cqe *)cqe64;
 587                 mlx5_handle_error_cqe(dev, err_cqe, wc);
 588                 mlx5_ib_dbg(dev, "%s error cqe on cqn 0x%x:\n",
 589                             opcode == MLX5_CQE_REQ_ERR ?
 590                             "Requestor" : "Responder", cq->mcq.cqn);
 591                 mlx5_ib_dbg(dev, "syndrome 0x%x, vendor syndrome 0x%x\n",
 592                             err_cqe->syndrome, err_cqe->vendor_err_synd);
 593                 if (opcode == MLX5_CQE_REQ_ERR) {
 594                         wq = &(*cur_qp)->sq;
 595                         wqe_ctr = be16_to_cpu(cqe64->wqe_counter);
 596                         idx = wqe_ctr & (wq->wqe_cnt - 1);
 597                         wc->wr_id = wq->wrid[idx];
 598                         wq->tail = wq->wqe_head[idx] + 1;
 599                 } else {
 600                         struct mlx5_ib_srq *srq;
 601
 602                         if ((*cur_qp)->ibqp.srq) {
 603                                 srq = to_msrq((*cur_qp)->ibqp.srq);
 604                                 wqe_ctr = be16_to_cpu(cqe64->wqe_counter);
 605                                 wc->wr_id = srq->wrid[wqe_ctr];
 606                                 mlx5_ib_free_srq_wqe(srq, wqe_ctr);
 607                         } else {
 608                                 wq = &(*cur_qp)->rq;
 609                                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 610                                 ++wq->tail;
 611                         }
 612                 }
 613                 break;
 614         case MLX5_CQE_SIG_ERR:
 615                 sig_err_cqe = (struct mlx5_sig_err_cqe *)cqe64;
 616
 617                 read_lock(&dev->mdev->priv.mkey_table.lock);
 618                 mmkey = __mlx5_mr_lookup(dev->mdev,
 619                                          mlx5_base_mkey(be32_to_cpu(sig_err_cqe->mkey)));
 620                 mr = to_mibmr(mmkey);
 621                 get_sig_err_item(sig_err_cqe, &mr->sig->err_item);
 622                 mr->sig->sig_err_exists = true;
 623                 mr->sig->sigerr_count++;
 624
 625                 mlx5_ib_warn(dev, "CQN: 0x%x Got SIGERR on key: 0x%x err_type %x err_offset %llx expected %x actual %x\n",
 626                              cq->mcq.cqn, mr->sig->err_item.key,
 627                              mr->sig->err_item.err_type,
 628                              mr->sig->err_item.sig_err_offset,
 629                              mr->sig->err_item.expected,
 630                              mr->sig->err_item.actual);
 631
 632                 read_unlock(&dev->mdev->priv.mkey_table.lock);
 633                 goto repoll;
 634         }
 635
 636         return 0;
 637 }
 638
 639 static int poll_soft_wc(struct mlx5_ib_cq *cq, int num_entries,
 640                         struct ib_wc *wc, bool is_fatal_err)
 641 {
 642         struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
 643         struct mlx5_ib_wc *soft_wc, *next;
 644         int npolled = 0;
 645
 646         list_for_each_entry_safe(soft_wc, next, &cq->wc_list, list) {
 647                 if (npolled >= num_entries)
 648                         break;
 649
 650                 mlx5_ib_dbg(dev, "polled software generated completion on CQ 0x%x\n",
 651                             cq->mcq.cqn);
 652
 653                 if (unlikely(is_fatal_err)) {
 654                         soft_wc->wc.status = IB_WC_WR_FLUSH_ERR;
 655                         soft_wc->wc.vendor_err = MLX5_CQE_SYNDROME_WR_FLUSH_ERR;
 656                 }
 657                 wc[npolled++] = soft_wc->wc;
 658                 list_del(&soft_wc->list);
 659                 kfree(soft_wc);
 660         }
 661
 662         return npolled;
 663 }
 664
 665 int mlx5_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 666 {
 667         struct mlx5_ib_cq *cq = to_mcq(ibcq);
 668         struct mlx5_ib_qp *cur_qp = NULL;
 669         struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
 670         struct mlx5_core_dev *mdev = dev->mdev;
 671         unsigned long flags;
 672         int soft_polled = 0;
 673         int npolled;
 674
 675         spin_lock_irqsave(&cq->lock, flags);
 676         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 677                 /* make sure no soft wqe's are waiting */
 678                 if (unlikely(!list_empty(&cq->wc_list)))
 679                         soft_polled = poll_soft_wc(cq, num_entries, wc, true);
 680
 681                 mlx5_ib_poll_sw_comp(cq, num_entries - soft_polled,
 682                                      wc + soft_polled, &npolled);
 683                 goto out;
 684         }
 685
 686         if (unlikely(!list_empty(&cq->wc_list)))
 687                 soft_polled = poll_soft_wc(cq, num_entries, wc, false);
 688
 689         for (npolled = 0; npolled < num_entries - soft_polled; npolled++) {
 690                 if (mlx5_poll_one(cq, &cur_qp, wc + soft_polled + npolled))
 691                         break;
 692         }
 693
 694         if (npolled)
 695                 mlx5_cq_set_ci(&cq->mcq);
 696 out:
 697         spin_unlock_irqrestore(&cq->lock, flags);
 698
 699         return soft_polled + npolled;
 700 }
 701
 702 int mlx5_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
 703 {
 704         struct mlx5_core_dev *mdev = to_mdev(ibcq->device)->mdev;
 705         struct mlx5_ib_cq *cq = to_mcq(ibcq);
 706         void __iomem *uar_page = mdev->priv.uar->map;
 707         unsigned long irq_flags;
 708         int ret = 0;
 709
 710         spin_lock_irqsave(&cq->lock, irq_flags);
 711         if (cq->notify_flags != IB_CQ_NEXT_COMP)
 712                 cq->notify_flags = flags & IB_CQ_SOLICITED_MASK;
 713
 714         if ((flags & IB_CQ_REPORT_MISSED_EVENTS) && !list_empty(&cq->wc_list))
 715                 ret = 1;
 716         spin_unlock_irqrestore(&cq->lock, irq_flags);
 717
 718         mlx5_cq_arm(&cq->mcq,
 719                     (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
 720                     MLX5_CQ_DB_REQ_NOT_SOL : MLX5_CQ_DB_REQ_NOT,
 721                     uar_page, to_mcq(ibcq)->mcq.cons_index);
 722
 723         return ret;
 724 }
 725
 726 static int alloc_cq_frag_buf(struct mlx5_ib_dev *dev,
 727                              struct mlx5_ib_cq_buf *buf,
 728                              int nent,
 729                              int cqe_size)
 730 {
 731         struct mlx5_frag_buf *frag_buf = &buf->frag_buf;
 732         u8 log_wq_stride = 6 + (cqe_size == 128 ? 1 : 0);
 733         u8 log_wq_sz     = ilog2(cqe_size);
 734         int err;
 735
 736         err = mlx5_frag_buf_alloc_node(dev->mdev,
 737                                        nent * cqe_size,
 738                                        frag_buf,
 739                                        dev->mdev->priv.numa_node);
 740         if (err)
 741                 return err;
 742
 743         mlx5_init_fbc(frag_buf->frags, log_wq_stride, log_wq_sz, &buf->fbc);
 744
 745         buf->cqe_size = cqe_size;
 746         buf->nent = nent;
 747
 748         return 0;
 749 }
 750
 751 enum {
 752         MLX5_CQE_RES_FORMAT_HASH = 0,
 753         MLX5_CQE_RES_FORMAT_CSUM = 1,
 754         MLX5_CQE_RES_FORMAT_CSUM_STRIDX = 3,
 755 };
 756
 757 static int mini_cqe_res_format_to_hw(struct mlx5_ib_dev *dev, u8 format)
 758 {
 759         switch (format) {
 760         case MLX5_IB_CQE_RES_FORMAT_HASH:
 761                 return MLX5_CQE_RES_FORMAT_HASH;
 762         case MLX5_IB_CQE_RES_FORMAT_CSUM:
 763                 return MLX5_CQE_RES_FORMAT_CSUM;
 764         case MLX5_IB_CQE_RES_FORMAT_CSUM_STRIDX:
 765                 if (MLX5_CAP_GEN(dev->mdev, mini_cqe_resp_stride_index))
 766                         return MLX5_CQE_RES_FORMAT_CSUM_STRIDX;
 767                 return -EOPNOTSUPP;
 768         default:
 769                 return -EINVAL;
 770         }
 771 }
 772
 773 static int create_cq_user(struct mlx5_ib_dev *dev, struct ib_udata *udata,
 774                           struct ib_ucontext *context, struct mlx5_ib_cq *cq,
 775                           int entries, u32 **cqb,
 776                           int *cqe_size, int *index, int *inlen)
 777 {
 778         struct mlx5_ib_create_cq ucmd = {};
 779         size_t ucmdlen;
 780         int page_shift;
 781         __be64 *pas;
 782         int npages;
 783         int ncont;
 784         void *cqc;
 785         int err;
 786
 787         ucmdlen = udata->inlen < sizeof(ucmd) ?
 788                   (sizeof(ucmd) - sizeof(ucmd.flags)) : sizeof(ucmd);
 789
 790         if (ib_copy_from_udata(&ucmd, udata, ucmdlen))
 791                 return -EFAULT;
 792
 793         if (ucmdlen == sizeof(ucmd) &&
 794             (ucmd.flags & ~(MLX5_IB_CREATE_CQ_FLAGS_CQE_128B_PAD)))
 795                 return -EINVAL;
 796
 797         if (ucmd.cqe_size != 64 && ucmd.cqe_size != 128)
 798                 return -EINVAL;
 799
 800         *cqe_size = ucmd.cqe_size;
 801
 802         cq->buf.umem = ib_umem_get(context, ucmd.buf_addr,
 803                                    entries * ucmd.cqe_size,
 804                                    IB_ACCESS_LOCAL_WRITE, 1);
 805         if (IS_ERR(cq->buf.umem)) {
 806                 err = PTR_ERR(cq->buf.umem);
 807                 return err;
 808         }
 809
 810         err = mlx5_ib_db_map_user(to_mucontext(context), ucmd.db_addr,
 811                                   &cq->db);
 812         if (err)
 813                 goto err_umem;
 814
 815         mlx5_ib_cont_pages(cq->buf.umem, ucmd.buf_addr, 0, &npages, &page_shift,
 816                            &ncont, NULL);
 817         mlx5_ib_dbg(dev, "addr 0x%llx, size %u, npages %d, page_shift %d, ncont %d\n",
 818                     ucmd.buf_addr, entries * ucmd.cqe_size, npages, page_shift, ncont);
 819
 820         *inlen = MLX5_ST_SZ_BYTES(create_cq_in) +
 821                  MLX5_FLD_SZ_BYTES(create_cq_in, pas[0]) * ncont;
 822         *cqb = kvzalloc(*inlen, GFP_KERNEL);
 823         if (!*cqb) {
 824                 err = -ENOMEM;
 825                 goto err_db;
 826         }
 827
 828         pas = (__be64 *)MLX5_ADDR_OF(create_cq_in, *cqb, pas);
 829         mlx5_ib_populate_pas(dev, cq->buf.umem, page_shift, pas, 0);
 830
 831         cqc = MLX5_ADDR_OF(create_cq_in, *cqb, cq_context);
 832         MLX5_SET(cqc, cqc, log_page_size,
 833                  page_shift - MLX5_ADAPTER_PAGE_SHIFT);
 834
 835         *index = to_mucontext(context)->bfregi.sys_pages[0];
 836
 837         if (ucmd.cqe_comp_en == 1) {
 838                 int mini_cqe_format;
 839
 840                 if (!((*cqe_size == 128 &&
 841                        MLX5_CAP_GEN(dev->mdev, cqe_compression_128)) ||
 842                       (*cqe_size == 64  &&
 843                        MLX5_CAP_GEN(dev->mdev, cqe_compression)))) {
 844                         err = -EOPNOTSUPP;
 845                         mlx5_ib_warn(dev, "CQE compression is not supported for size %d!\n",
 846                                      *cqe_size);
 847                         goto err_cqb;
 848                 }
 849
 850                 mini_cqe_format =
 851                         mini_cqe_res_format_to_hw(dev,
 852                                                   ucmd.cqe_comp_res_format);
 853                 if (mini_cqe_format < 0) {
 854                         err = mini_cqe_format;
 855                         mlx5_ib_dbg(dev, "CQE compression res format %d error: %d\n",
 856                                     ucmd.cqe_comp_res_format, err);
 857                         goto err_cqb;
 858                 }
 859
 860                 MLX5_SET(cqc, cqc, cqe_comp_en, 1);
 861                 MLX5_SET(cqc, cqc, mini_cqe_res_format, mini_cqe_format);
 862         }
 863
 864         if (ucmd.flags & MLX5_IB_CREATE_CQ_FLAGS_CQE_128B_PAD) {
 865                 if (*cqe_size != 128 ||
 866                     !MLX5_CAP_GEN(dev->mdev, cqe_128_always)) {
 867                         err = -EOPNOTSUPP;
 868                         mlx5_ib_warn(dev,
 869                                      "CQE padding is not supported for CQE size of %dB!\n",
 870                                      *cqe_size);
 871                         goto err_cqb;
 872                 }
 873
 874                 cq->private_flags |= MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD;
 875         }
 876
 877         MLX5_SET(create_cq_in, *cqb, uid, to_mucontext(context)->devx_uid);
 878         return 0;
 879
 880 err_cqb:
 881         kvfree(*cqb);
 882
 883 err_db:
 884         mlx5_ib_db_unmap_user(to_mucontext(context), &cq->db);
 885
 886 err_umem:
 887         ib_umem_release(cq->buf.umem);
 888         return err;
 889 }
 890
 891 static void destroy_cq_user(struct mlx5_ib_cq *cq, struct ib_ucontext *context)
 892 {
 893         mlx5_ib_db_unmap_user(to_mucontext(context), &cq->db);
 894         ib_umem_release(cq->buf.umem);
 895 }
 896
 897 static void init_cq_frag_buf(struct mlx5_ib_cq *cq,
 898                              struct mlx5_ib_cq_buf *buf)
 899 {
 900         int i;
 901         void *cqe;
 902         struct mlx5_cqe64 *cqe64;
 903
 904         for (i = 0; i < buf->nent; i++) {
 905                 cqe = get_cqe(cq, i);
 906                 cqe64 = buf->cqe_size == 64 ? cqe : cqe + 64;
 907                 cqe64->op_own = MLX5_CQE_INVALID << 4;
 908         }
 909 }
 910
 911 static int create_cq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
 912                             int entries, int cqe_size,
 913                             u32 **cqb, int *index, int *inlen)
 914 {
 915         __be64 *pas;
 916         void *cqc;
 917         int err;
 918
 919         err = mlx5_db_alloc(dev->mdev, &cq->db);
 920         if (err)
 921                 return err;
 922
 923         cq->mcq.set_ci_db  = cq->db.db;
 924         cq->mcq.arm_db     = cq->db.db + 1;
 925         cq->mcq.cqe_sz = cqe_size;
 926
 927         err = alloc_cq_frag_buf(dev, &cq->buf, entries, cqe_size);
 928         if (err)
 929                 goto err_db;
 930
 931         init_cq_frag_buf(cq, &cq->buf);
 932
 933         *inlen = MLX5_ST_SZ_BYTES(create_cq_in) +
 934                  MLX5_FLD_SZ_BYTES(create_cq_in, pas[0]) *
 935                  cq->buf.frag_buf.npages;
 936         *cqb = kvzalloc(*inlen, GFP_KERNEL);
 937         if (!*cqb) {
 938                 err = -ENOMEM;
 939                 goto err_buf;
 940         }
 941
 942         pas = (__be64 *)MLX5_ADDR_OF(create_cq_in, *cqb, pas);
 943         mlx5_fill_page_frag_array(&cq->buf.frag_buf, pas);
 944
 945         cqc = MLX5_ADDR_OF(create_cq_in, *cqb, cq_context);
 946         MLX5_SET(cqc, cqc, log_page_size,
 947                  cq->buf.frag_buf.page_shift -
 948                  MLX5_ADAPTER_PAGE_SHIFT);
 949
 950         *index = dev->mdev->priv.uar->index;
 951
 952         return 0;
 953
 954 err_buf:
 955         free_cq_buf(dev, &cq->buf);
 956
 957 err_db:
 958         mlx5_db_free(dev->mdev, &cq->db);
 959         return err;
 960 }
 961
 962 static void destroy_cq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq)
 963 {
 964         free_cq_buf(dev, &cq->buf);
 965         mlx5_db_free(dev->mdev, &cq->db);
 966 }
 967
 968 static void notify_soft_wc_handler(struct work_struct *work)
 969 {
 970         struct mlx5_ib_cq *cq = container_of(work, struct mlx5_ib_cq,
 971                                              notify_work);
 972
 973         cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
 974 }
 975
 976 struct ib_cq *mlx5_ib_create_cq(struct ib_device *ibdev,
 977                                 const struct ib_cq_init_attr *attr,
 978                                 struct ib_ucontext *context,
 979                                 struct ib_udata *udata)
 980 {
 981         int entries = attr->cqe;
 982         int vector = attr->comp_vector;
 983         struct mlx5_ib_dev *dev = to_mdev(ibdev);
 984         struct mlx5_ib_cq *cq;
 985         int uninitialized_var(index);
 986         int uninitialized_var(inlen);
 987         u32 *cqb = NULL;
 988         void *cqc;
 989         int cqe_size;
 990         unsigned int irqn;
 991         int eqn;
 992         int err;
 993
 994         if (entries < 0 ||
 995             (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz))))
 996                 return ERR_PTR(-EINVAL);
 997
 998         if (check_cq_create_flags(attr->flags))
 999                 return ERR_PTR(-EOPNOTSUPP);
1000
1001         entries = roundup_pow_of_two(entries + 1);
1002         if (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz)))
1003                 return ERR_PTR(-EINVAL);
1004
1005         cq = kzalloc(sizeof(*cq), GFP_KERNEL);
1006         if (!cq)
1007                 return ERR_PTR(-ENOMEM);
1008
1009         cq->ibcq.cqe = entries - 1;
1010         mutex_init(&cq->resize_mutex);
1011         spin_lock_init(&cq->lock);
1012         cq->resize_buf = NULL;
1013         cq->resize_umem = NULL;
1014         cq->create_flags = attr->flags;
1015         INIT_LIST_HEAD(&cq->list_send_qp);
1016         INIT_LIST_HEAD(&cq->list_recv_qp);
1017
1018         if (context) {
1019                 err = create_cq_user(dev, udata, context, cq, entries,
1020                                      &cqb, &cqe_size, &index, &inlen);
1021                 if (err)
1022                         goto err_create;
1023         } else {
1024                 cqe_size = cache_line_size() == 128 ? 128 : 64;
1025                 err = create_cq_kernel(dev, cq, entries, cqe_size, &cqb,
1026                                        &index, &inlen);
1027                 if (err)
1028                         goto err_create;
1029
1030                 INIT_WORK(&cq->notify_work, notify_soft_wc_handler);
1031         }
1032
1033         err = mlx5_vector2eqn(dev->mdev, vector, &eqn, &irqn);
1034         if (err)
1035                 goto err_cqb;
1036
1037         cq->cqe_size = cqe_size;
1038
1039         cqc = MLX5_ADDR_OF(create_cq_in, cqb, cq_context);
1040         MLX5_SET(cqc, cqc, cqe_sz,
1041                  cqe_sz_to_mlx_sz(cqe_size,
1042                                   cq->private_flags &
1043                                   MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD));
1044         MLX5_SET(cqc, cqc, log_cq_size, ilog2(entries));
1045         MLX5_SET(cqc, cqc, uar_page, index);
1046         MLX5_SET(cqc, cqc, c_eqn, eqn);
1047         MLX5_SET64(cqc, cqc, dbr_addr, cq->db.dma);
1048         if (cq->create_flags & IB_UVERBS_CQ_FLAGS_IGNORE_OVERRUN)
1049                 MLX5_SET(cqc, cqc, oi, 1);
1050
1051         err = mlx5_core_create_cq(dev->mdev, &cq->mcq, cqb, inlen);
1052         if (err)
1053                 goto err_cqb;
1054
1055         mlx5_ib_dbg(dev, "cqn 0x%x\n", cq->mcq.cqn);
1056         cq->mcq.irqn = irqn;
1057         if (context)
1058                 cq->mcq.tasklet_ctx.comp = mlx5_ib_cq_comp;
1059         else
1060                 cq->mcq.comp  = mlx5_ib_cq_comp;
1061         cq->mcq.event = mlx5_ib_cq_event;
1062
1063         INIT_LIST_HEAD(&cq->wc_list);
1064
1065         if (context)
1066                 if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof(__u32))) {
1067                         err = -EFAULT;
1068                         goto err_cmd;
1069                 }
1070
1071
1072         kvfree(cqb);
1073         return &cq->ibcq;
1074
1075 err_cmd:
1076         mlx5_core_destroy_cq(dev->mdev, &cq->mcq);
1077
1078 err_cqb:
1079         kvfree(cqb);
1080         if (context)
1081                 destroy_cq_user(cq, context);
1082         else
1083                 destroy_cq_kernel(dev, cq);
1084
1085 err_create:
1086         kfree(cq);
1087
1088         return ERR_PTR(err);
1089 }
1090
1091
1092 int mlx5_ib_destroy_cq(struct ib_cq *cq)
1093 {
1094         struct mlx5_ib_dev *dev = to_mdev(cq->device);
1095         struct mlx5_ib_cq *mcq = to_mcq(cq);
1096         struct ib_ucontext *context = NULL;
1097
1098         if (cq->uobject)
1099                 context = cq->uobject->context;
1100
1101         mlx5_core_destroy_cq(dev->mdev, &mcq->mcq);
1102         if (context)
1103                 destroy_cq_user(mcq, context);
1104         else
1105                 destroy_cq_kernel(dev, mcq);
1106
1107         kfree(mcq);
1108
1109         return 0;
1110 }
1111
1112 static int is_equal_rsn(struct mlx5_cqe64 *cqe64, u32 rsn)
1113 {
1114         return rsn == (ntohl(cqe64->sop_drop_qpn) & 0xffffff);
1115 }
1116
1117 void __mlx5_ib_cq_clean(struct mlx5_ib_cq *cq, u32 rsn, struct mlx5_ib_srq *srq)
1118 {
1119         struct mlx5_cqe64 *cqe64, *dest64;
1120         void *cqe, *dest;
1121         u32 prod_index;
1122         int nfreed = 0;
1123         u8 owner_bit;
1124
1125         if (!cq)
1126                 return;
1127
1128         /* First we need to find the current producer index, so we
1129          * know where to start cleaning from.  It doesn't matter if HW
1130          * adds new entries after this loop -- the QP we're worried
1131          * about is already in RESET, so the new entries won't come
1132          * from our QP and therefore don't need to be checked.
1133          */
1134         for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); prod_index++)
1135                 if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
1136                         break;
1137
1138         /* Now sweep backwards through the CQ, removing CQ entries
1139          * that match our QP by copying older entries on top of them.
1140          */
1141         while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
1142                 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
1143                 cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64;
1144                 if (is_equal_rsn(cqe64, rsn)) {
1145                         if (srq && (ntohl(cqe64->srqn) & 0xffffff))
1146                                 mlx5_ib_free_srq_wqe(srq, be16_to_cpu(cqe64->wqe_counter));
1147                         ++nfreed;
1148                 } else if (nfreed) {
1149                         dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe);
1150                         dest64 = (cq->mcq.cqe_sz == 64) ? dest : dest + 64;
1151                         owner_bit = dest64->op_own & MLX5_CQE_OWNER_MASK;
1152                         memcpy(dest, cqe, cq->mcq.cqe_sz);
1153                         dest64->op_own = owner_bit |
1154                                 (dest64->op_own & ~MLX5_CQE_OWNER_MASK);
1155                 }
1156         }
1157
1158         if (nfreed) {
1159                 cq->mcq.cons_index += nfreed;
1160                 /* Make sure update of buffer contents is done before
1161                  * updating consumer index.
1162                  */
1163                 wmb();
1164                 mlx5_cq_set_ci(&cq->mcq);
1165         }
1166 }
1167
1168 void mlx5_ib_cq_clean(struct mlx5_ib_cq *cq, u32 qpn, struct mlx5_ib_srq *srq)
1169 {
1170         if (!cq)
1171                 return;
1172
1173         spin_lock_irq(&cq->lock);
1174         __mlx5_ib_cq_clean(cq, qpn, srq);
1175         spin_unlock_irq(&cq->lock);
1176 }
1177
1178 int mlx5_ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
1179 {
1180         struct mlx5_ib_dev *dev = to_mdev(cq->device);
1181         struct mlx5_ib_cq *mcq = to_mcq(cq);
1182         int err;
1183
1184         if (!MLX5_CAP_GEN(dev->mdev, cq_moderation))
1185                 return -EOPNOTSUPP;
1186
1187         if (cq_period > MLX5_MAX_CQ_PERIOD)
1188                 return -EINVAL;
1189
1190         err = mlx5_core_modify_cq_moderation(dev->mdev, &mcq->mcq,
1191                                              cq_period, cq_count);
1192         if (err)
1193                 mlx5_ib_warn(dev, "modify cq 0x%x failed\n", mcq->mcq.cqn);
1194
1195         return err;
1196 }
1197
1198 static int resize_user(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
1199                        int entries, struct ib_udata *udata, int *npas,
1200                        int *page_shift, int *cqe_size)
1201 {
1202         struct mlx5_ib_resize_cq ucmd;
1203         struct ib_umem *umem;
1204         int err;
1205         int npages;
1206         struct ib_ucontext *context = cq->buf.umem->context;
1207
1208         err = ib_copy_from_udata(&ucmd, udata, sizeof(ucmd));
1209         if (err)
1210                 return err;
1211
1212         if (ucmd.reserved0 || ucmd.reserved1)
1213                 return -EINVAL;
1214
1215         /* check multiplication overflow */
1216         if (ucmd.cqe_size && SIZE_MAX / ucmd.cqe_size <= entries - 1)
1217                 return -EINVAL;
1218
1219         umem = ib_umem_get(context, ucmd.buf_addr,
1220                            (size_t)ucmd.cqe_size * entries,
1221                            IB_ACCESS_LOCAL_WRITE, 1);
1222         if (IS_ERR(umem)) {
1223                 err = PTR_ERR(umem);
1224                 return err;
1225         }
1226
1227         mlx5_ib_cont_pages(umem, ucmd.buf_addr, 0, &npages, page_shift,
1228                            npas, NULL);
1229
1230         cq->resize_umem = umem;
1231         *cqe_size = ucmd.cqe_size;
1232
1233         return 0;
1234 }
1235
1236 static void un_resize_user(struct mlx5_ib_cq *cq)
1237 {
1238         ib_umem_release(cq->resize_umem);
1239 }
1240
1241 static int resize_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
1242                          int entries, int cqe_size)
1243 {
1244         int err;
1245
1246         cq->resize_buf = kzalloc(sizeof(*cq->resize_buf), GFP_KERNEL);
1247         if (!cq->resize_buf)
1248                 return -ENOMEM;
1249
1250         err = alloc_cq_frag_buf(dev, cq->resize_buf, entries, cqe_size);
1251         if (err)
1252                 goto ex;
1253
1254         init_cq_frag_buf(cq, cq->resize_buf);
1255
1256         return 0;
1257
1258 ex:
1259         kfree(cq->resize_buf);
1260         return err;
1261 }
1262
1263 static void un_resize_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq)
1264 {
1265         free_cq_buf(dev, cq->resize_buf);
1266         cq->resize_buf = NULL;
1267 }
1268
1269 static int copy_resize_cqes(struct mlx5_ib_cq *cq)
1270 {
1271         struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
1272         struct mlx5_cqe64 *scqe64;
1273         struct mlx5_cqe64 *dcqe64;
1274         void *start_cqe;
1275         void *scqe;
1276         void *dcqe;
1277         int ssize;
1278         int dsize;
1279         int i;
1280         u8 sw_own;
1281
1282         ssize = cq->buf.cqe_size;
1283         dsize = cq->resize_buf->cqe_size;
1284         if (ssize != dsize) {
1285                 mlx5_ib_warn(dev, "resize from different cqe size is not supported\n");
1286                 return -EINVAL;
1287         }
1288
1289         i = cq->mcq.cons_index;
1290         scqe = get_sw_cqe(cq, i);
1291         scqe64 = ssize == 64 ? scqe : scqe + 64;
1292         start_cqe = scqe;
1293         if (!scqe) {
1294                 mlx5_ib_warn(dev, "expected cqe in sw ownership\n");
1295                 return -EINVAL;
1296         }
1297
1298         while ((scqe64->op_own >> 4) != MLX5_CQE_RESIZE_CQ) {
1299                 dcqe = mlx5_frag_buf_get_wqe(&cq->resize_buf->fbc,
1300                                              (i + 1) & cq->resize_buf->nent);
1301                 dcqe64 = dsize == 64 ? dcqe : dcqe + 64;
1302                 sw_own = sw_ownership_bit(i + 1, cq->resize_buf->nent);
1303                 memcpy(dcqe, scqe, dsize);
1304                 dcqe64->op_own = (dcqe64->op_own & ~MLX5_CQE_OWNER_MASK) | sw_own;
1305
1306                 ++i;
1307                 scqe = get_sw_cqe(cq, i);
1308                 scqe64 = ssize == 64 ? scqe : scqe + 64;
1309                 if (!scqe) {
1310                         mlx5_ib_warn(dev, "expected cqe in sw ownership\n");
1311                         return -EINVAL;
1312                 }
1313
1314                 if (scqe == start_cqe) {
1315                         pr_warn("resize CQ failed to get resize CQE, CQN 0x%x\n",
1316                                 cq->mcq.cqn);
1317                         return -ENOMEM;
1318                 }
1319         }
1320         ++cq->mcq.cons_index;
1321         return 0;
1322 }
1323
1324 int mlx5_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
1325 {
1326         struct mlx5_ib_dev *dev = to_mdev(ibcq->device);
1327         struct mlx5_ib_cq *cq = to_mcq(ibcq);
1328         void *cqc;
1329         u32 *in;
1330         int err;
1331         int npas;
1332         __be64 *pas;
1333         int page_shift;
1334         int inlen;
1335         int uninitialized_var(cqe_size);
1336         unsigned long flags;
1337
1338         if (!MLX5_CAP_GEN(dev->mdev, cq_resize)) {
1339                 pr_info("Firmware does not support resize CQ\n");
1340                 return -ENOSYS;
1341         }
1342
1343         if (entries < 1 ||
1344             entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz))) {
1345                 mlx5_ib_warn(dev, "wrong entries number %d, max %d\n",
1346                              entries,
1347                              1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz));
1348                 return -EINVAL;
1349         }
1350
1351         entries = roundup_pow_of_two(entries + 1);
1352         if (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz)) + 1)
1353                 return -EINVAL;
1354
1355         if (entries == ibcq->cqe + 1)
1356                 return 0;
1357
1358         mutex_lock(&cq->resize_mutex);
1359         if (udata) {
1360                 err = resize_user(dev, cq, entries, udata, &npas, &page_shift,
1361                                   &cqe_size);
1362         } else {
1363                 cqe_size = 64;
1364                 err = resize_kernel(dev, cq, entries, cqe_size);
1365                 if (!err) {
1366                         struct mlx5_frag_buf *frag_buf = &cq->resize_buf->frag_buf;
1367
1368                         npas = frag_buf->npages;
1369                         page_shift = frag_buf->page_shift;
1370                 }
1371         }
1372
1373         if (err)
1374                 goto ex;
1375
1376         inlen = MLX5_ST_SZ_BYTES(modify_cq_in) +
1377                 MLX5_FLD_SZ_BYTES(modify_cq_in, pas[0]) * npas;
1378
1379         in = kvzalloc(inlen, GFP_KERNEL);
1380         if (!in) {
1381                 err = -ENOMEM;
1382                 goto ex_resize;
1383         }
1384
1385         pas = (__be64 *)MLX5_ADDR_OF(modify_cq_in, in, pas);
1386         if (udata)
1387                 mlx5_ib_populate_pas(dev, cq->resize_umem, page_shift,
1388                                      pas, 0);
1389         else
1390                 mlx5_fill_page_frag_array(&cq->resize_buf->frag_buf, pas);
1391
1392         MLX5_SET(modify_cq_in, in,
1393                  modify_field_select_resize_field_select.resize_field_select.resize_field_select,
1394                  MLX5_MODIFY_CQ_MASK_LOG_SIZE  |
1395                  MLX5_MODIFY_CQ_MASK_PG_OFFSET |
1396                  MLX5_MODIFY_CQ_MASK_PG_SIZE);
1397
1398         cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context);
1399
1400         MLX5_SET(cqc, cqc, log_page_size,
1401                  page_shift - MLX5_ADAPTER_PAGE_SHIFT);
1402         MLX5_SET(cqc, cqc, cqe_sz,
1403                  cqe_sz_to_mlx_sz(cqe_size,
1404                                   cq->private_flags &
1405                                   MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD));
1406         MLX5_SET(cqc, cqc, log_cq_size, ilog2(entries));
1407
1408         MLX5_SET(modify_cq_in, in, op_mod, MLX5_CQ_OPMOD_RESIZE);
1409         MLX5_SET(modify_cq_in, in, cqn, cq->mcq.cqn);
1410
1411         err = mlx5_core_modify_cq(dev->mdev, &cq->mcq, in, inlen);
1412         if (err)
1413                 goto ex_alloc;
1414
1415         if (udata) {
1416                 cq->ibcq.cqe = entries - 1;
1417                 ib_umem_release(cq->buf.umem);
1418                 cq->buf.umem = cq->resize_umem;
1419                 cq->resize_umem = NULL;
1420         } else {
1421                 struct mlx5_ib_cq_buf tbuf;
1422                 int resized = 0;
1423
1424                 spin_lock_irqsave(&cq->lock, flags);
1425                 if (cq->resize_buf) {
1426                         err = copy_resize_cqes(cq);
1427                         if (!err) {
1428                                 tbuf = cq->buf;
1429                                 cq->buf = *cq->resize_buf;
1430                                 kfree(cq->resize_buf);
1431                                 cq->resize_buf = NULL;
1432                                 resized = 1;
1433                         }
1434                 }
1435                 cq->ibcq.cqe = entries - 1;
1436                 spin_unlock_irqrestore(&cq->lock, flags);
1437                 if (resized)
1438                         free_cq_buf(dev, &tbuf);
1439         }
1440         mutex_unlock(&cq->resize_mutex);
1441
1442         kvfree(in);
1443         return 0;
1444
1445 ex_alloc:
1446         kvfree(in);
1447
1448 ex_resize:
1449         if (udata)
1450                 un_resize_user(cq);
1451         else
1452                 un_resize_kernel(dev, cq);
1453 ex:
1454         mutex_unlock(&cq->resize_mutex);
1455         return err;
1456 }
1457
1458 int mlx5_ib_get_cqe_size(struct ib_cq *ibcq)
1459 {
1460         struct mlx5_ib_cq *cq;
1461
1462         if (!ibcq)
1463                 return 128;
1464
1465         cq = to_mcq(ibcq);
1466         return cq->cqe_size;
1467 }
1468
1469 /* Called from atomic context */
1470 int mlx5_ib_generate_wc(struct ib_cq *ibcq, struct ib_wc *wc)
1471 {
1472         struct mlx5_ib_wc *soft_wc;
1473         struct mlx5_ib_cq *cq = to_mcq(ibcq);
1474         unsigned long flags;
1475
1476         soft_wc = kmalloc(sizeof(*soft_wc), GFP_ATOMIC);
1477         if (!soft_wc)
1478                 return -ENOMEM;
1479
1480         soft_wc->wc = *wc;
1481         spin_lock_irqsave(&cq->lock, flags);
1482         list_add_tail(&soft_wc->list, &cq->wc_list);
1483         if (cq->notify_flags == IB_CQ_NEXT_COMP ||
1484             wc->status != IB_WC_SUCCESS) {
1485                 cq->notify_flags = 0;
1486                 schedule_work(&cq->notify_work);
1487         }
1488         spin_unlock_irqrestore(&cq->lock, flags);
1489
1490         return 0;
1491 }