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 #include "srq.h"
  39 #include "qp.h"
  40
  41 static void mlx5_ib_cq_comp(struct mlx5_core_cq *cq, struct mlx5_eqe *eqe)
  42 {
  43         struct ib_cq *ibcq = &to_mibcq(cq)->ibcq;
  44
  45         ibcq->comp_handler(ibcq, ibcq->cq_context);
  46 }
  47
  48 static void mlx5_ib_cq_event(struct mlx5_core_cq *mcq, enum mlx5_event type)
  49 {
  50         struct mlx5_ib_cq *cq = container_of(mcq, struct mlx5_ib_cq, mcq);
  51         struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
  52         struct ib_cq *ibcq = &cq->ibcq;
  53         struct ib_event event;
  54
  55         if (type != MLX5_EVENT_TYPE_CQ_ERROR) {
  56                 mlx5_ib_warn(dev, "Unexpected event type %d on CQ %06x\n",
  57                              type, mcq->cqn);
  58                 return;
  59         }
  60
  61         if (ibcq->event_handler) {
  62                 event.device     = &dev->ib_dev;
  63                 event.event      = IB_EVENT_CQ_ERR;
  64                 event.element.cq = ibcq;
  65                 ibcq->event_handler(&event, ibcq->cq_context);
  66         }
  67 }
  68
  69 static void *get_cqe(struct mlx5_ib_cq *cq, int n)
  70 {
  71         return mlx5_frag_buf_get_wqe(&cq->buf.fbc, n);
  72 }
  73
  74 static u8 sw_ownership_bit(int n, int nent)
  75 {
  76         return (n & nent) ? 1 : 0;
  77 }
  78
  79 static void *get_sw_cqe(struct mlx5_ib_cq *cq, int n)
  80 {
  81         void *cqe = get_cqe(cq, n & cq->ibcq.cqe);
  82         struct mlx5_cqe64 *cqe64;
  83
  84         cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64;
  85
  86         if (likely(get_cqe_opcode(cqe64) != MLX5_CQE_INVALID) &&
  87             !((cqe64->op_own & MLX5_CQE_OWNER_MASK) ^ !!(n & (cq->ibcq.cqe + 1)))) {
  88                 return cqe;
  89         } else {
  90                 return NULL;
  91         }
  92 }
  93
  94 static void *next_cqe_sw(struct mlx5_ib_cq *cq)
  95 {
  96         return get_sw_cqe(cq, cq->mcq.cons_index);
  97 }
  98
  99 static enum ib_wc_opcode get_umr_comp(struct mlx5_ib_wq *wq, int idx)
 100 {
 101         switch (wq->wr_data[idx]) {
 102         case MLX5_IB_WR_UMR:
 103                 return 0;
 104
 105         case IB_WR_LOCAL_INV:
 106                 return IB_WC_LOCAL_INV;
 107
 108         case IB_WR_REG_MR:
 109                 return IB_WC_REG_MR;
 110
 111         default:
 112                 pr_warn("unknown completion status\n");
 113                 return 0;
 114         }
 115 }
 116
 117 static void handle_good_req(struct ib_wc *wc, struct mlx5_cqe64 *cqe,
 118                             struct mlx5_ib_wq *wq, int idx)
 119 {
 120         wc->wc_flags = 0;
 121         switch (be32_to_cpu(cqe->sop_drop_qpn) >> 24) {
 122         case MLX5_OPCODE_RDMA_WRITE_IMM:
 123                 wc->wc_flags |= IB_WC_WITH_IMM;
 124                 fallthrough;
 125         case MLX5_OPCODE_RDMA_WRITE:
 126                 wc->opcode    = IB_WC_RDMA_WRITE;
 127                 break;
 128         case MLX5_OPCODE_SEND_IMM:
 129                 wc->wc_flags |= IB_WC_WITH_IMM;
 130                 fallthrough;
 131         case MLX5_OPCODE_SEND:
 132         case MLX5_OPCODE_SEND_INVAL:
 133                 wc->opcode    = IB_WC_SEND;
 134                 break;
 135         case MLX5_OPCODE_RDMA_READ:
 136                 wc->opcode    = IB_WC_RDMA_READ;
 137                 wc->byte_len  = be32_to_cpu(cqe->byte_cnt);
 138                 break;
 139         case MLX5_OPCODE_ATOMIC_CS:
 140                 wc->opcode    = IB_WC_COMP_SWAP;
 141                 wc->byte_len  = 8;
 142                 break;
 143         case MLX5_OPCODE_ATOMIC_FA:
 144                 wc->opcode    = IB_WC_FETCH_ADD;
 145                 wc->byte_len  = 8;
 146                 break;
 147         case MLX5_OPCODE_ATOMIC_MASKED_CS:
 148                 wc->opcode    = IB_WC_MASKED_COMP_SWAP;
 149                 wc->byte_len  = 8;
 150                 break;
 151         case MLX5_OPCODE_ATOMIC_MASKED_FA:
 152                 wc->opcode    = IB_WC_MASKED_FETCH_ADD;
 153                 wc->byte_len  = 8;
 154                 break;
 155         case MLX5_OPCODE_UMR:
 156                 wc->opcode = get_umr_comp(wq, idx);
 157                 break;
 158         }
 159 }
 160
 161 enum {
 162         MLX5_GRH_IN_BUFFER = 1,
 163         MLX5_GRH_IN_CQE    = 2,
 164 };
 165
 166 static void handle_responder(struct ib_wc *wc, struct mlx5_cqe64 *cqe,
 167                              struct mlx5_ib_qp *qp)
 168 {
 169         enum rdma_link_layer ll = rdma_port_get_link_layer(qp->ibqp.device, 1);
 170         struct mlx5_ib_dev *dev = to_mdev(qp->ibqp.device);
 171         struct mlx5_ib_srq *srq = NULL;
 172         struct mlx5_ib_wq *wq;
 173         u16 wqe_ctr;
 174         u8  roce_packet_type;
 175         bool vlan_present;
 176         u8 g;
 177
 178         if (qp->ibqp.srq || qp->ibqp.xrcd) {
 179                 struct mlx5_core_srq *msrq = NULL;
 180
 181                 if (qp->ibqp.xrcd) {
 182                         msrq = mlx5_cmd_get_srq(dev, be32_to_cpu(cqe->srqn));
 183                         if (msrq)
 184                                 srq = to_mibsrq(msrq);
 185                 } else {
 186                         srq = to_msrq(qp->ibqp.srq);
 187                 }
 188                 if (srq) {
 189                         wqe_ctr = be16_to_cpu(cqe->wqe_counter);
 190                         wc->wr_id = srq->wrid[wqe_ctr];
 191                         mlx5_ib_free_srq_wqe(srq, wqe_ctr);
 192                         if (msrq)
 193                                 mlx5_core_res_put(&msrq->common);
 194                 }
 195         } else {
 196                 wq        = &qp->rq;
 197                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 198                 ++wq->tail;
 199         }
 200         wc->byte_len = be32_to_cpu(cqe->byte_cnt);
 201
 202         switch (get_cqe_opcode(cqe)) {
 203         case MLX5_CQE_RESP_WR_IMM:
 204                 wc->opcode      = IB_WC_RECV_RDMA_WITH_IMM;
 205                 wc->wc_flags    = IB_WC_WITH_IMM;
 206                 wc->ex.imm_data = cqe->immediate;
 207                 break;
 208         case MLX5_CQE_RESP_SEND:
 209                 wc->opcode   = IB_WC_RECV;
 210                 wc->wc_flags = IB_WC_IP_CSUM_OK;
 211                 if (unlikely(!((cqe->hds_ip_ext & CQE_L3_OK) &&
 212                                (cqe->hds_ip_ext & CQE_L4_OK))))
 213                         wc->wc_flags = 0;
 214                 break;
 215         case MLX5_CQE_RESP_SEND_IMM:
 216                 wc->opcode      = IB_WC_RECV;
 217                 wc->wc_flags    = IB_WC_WITH_IMM;
 218                 wc->ex.imm_data = cqe->immediate;
 219                 break;
 220         case MLX5_CQE_RESP_SEND_INV:
 221                 wc->opcode      = IB_WC_RECV;
 222                 wc->wc_flags    = IB_WC_WITH_INVALIDATE;
 223                 wc->ex.invalidate_rkey = be32_to_cpu(cqe->inval_rkey);
 224                 break;
 225         }
 226         wc->src_qp         = be32_to_cpu(cqe->flags_rqpn) & 0xffffff;
 227         wc->dlid_path_bits = cqe->ml_path;
 228         g = (be32_to_cpu(cqe->flags_rqpn) >> 28) & 3;
 229         wc->wc_flags |= g ? IB_WC_GRH : 0;
 230         if (is_qp1(qp->type)) {
 231                 u16 pkey = be32_to_cpu(cqe->pkey) & 0xffff;
 232
 233                 ib_find_cached_pkey(&dev->ib_dev, qp->port, pkey,
 234                                     &wc->pkey_index);
 235         } else {
 236                 wc->pkey_index = 0;
 237         }
 238
 239         if (ll != IB_LINK_LAYER_ETHERNET) {
 240                 wc->slid = be16_to_cpu(cqe->slid);
 241                 wc->sl = (be32_to_cpu(cqe->flags_rqpn) >> 24) & 0xf;
 242                 return;
 243         }
 244
 245         wc->slid = 0;
 246         vlan_present = cqe->l4_l3_hdr_type & 0x1;
 247         roce_packet_type   = (be32_to_cpu(cqe->flags_rqpn) >> 24) & 0x3;
 248         if (vlan_present) {
 249                 wc->vlan_id = (be16_to_cpu(cqe->vlan_info)) & 0xfff;
 250                 wc->sl = (be16_to_cpu(cqe->vlan_info) >> 13) & 0x7;
 251                 wc->wc_flags |= IB_WC_WITH_VLAN;
 252         } else {
 253                 wc->sl = 0;
 254         }
 255
 256         switch (roce_packet_type) {
 257         case MLX5_CQE_ROCE_L3_HEADER_TYPE_GRH:
 258                 wc->network_hdr_type = RDMA_NETWORK_ROCE_V1;
 259                 break;
 260         case MLX5_CQE_ROCE_L3_HEADER_TYPE_IPV6:
 261                 wc->network_hdr_type = RDMA_NETWORK_IPV6;
 262                 break;
 263         case MLX5_CQE_ROCE_L3_HEADER_TYPE_IPV4:
 264                 wc->network_hdr_type = RDMA_NETWORK_IPV4;
 265                 break;
 266         }
 267         wc->wc_flags |= IB_WC_WITH_NETWORK_HDR_TYPE;
 268 }
 269
 270 static void dump_cqe(struct mlx5_ib_dev *dev, struct mlx5_err_cqe *cqe)
 271 {
 272         mlx5_ib_warn(dev, "dump error cqe\n");
 273         mlx5_dump_err_cqe(dev->mdev, cqe);
 274 }
 275
 276 static void mlx5_handle_error_cqe(struct mlx5_ib_dev *dev,
 277                                   struct mlx5_err_cqe *cqe,
 278                                   struct ib_wc *wc)
 279 {
 280         int dump = 1;
 281
 282         switch (cqe->syndrome) {
 283         case MLX5_CQE_SYNDROME_LOCAL_LENGTH_ERR:
 284                 wc->status = IB_WC_LOC_LEN_ERR;
 285                 break;
 286         case MLX5_CQE_SYNDROME_LOCAL_QP_OP_ERR:
 287                 wc->status = IB_WC_LOC_QP_OP_ERR;
 288                 break;
 289         case MLX5_CQE_SYNDROME_LOCAL_PROT_ERR:
 290                 wc->status = IB_WC_LOC_PROT_ERR;
 291                 break;
 292         case MLX5_CQE_SYNDROME_WR_FLUSH_ERR:
 293                 dump = 0;
 294                 wc->status = IB_WC_WR_FLUSH_ERR;
 295                 break;
 296         case MLX5_CQE_SYNDROME_MW_BIND_ERR:
 297                 wc->status = IB_WC_MW_BIND_ERR;
 298                 break;
 299         case MLX5_CQE_SYNDROME_BAD_RESP_ERR:
 300                 wc->status = IB_WC_BAD_RESP_ERR;
 301                 break;
 302         case MLX5_CQE_SYNDROME_LOCAL_ACCESS_ERR:
 303                 wc->status = IB_WC_LOC_ACCESS_ERR;
 304                 break;
 305         case MLX5_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
 306                 wc->status = IB_WC_REM_INV_REQ_ERR;
 307                 break;
 308         case MLX5_CQE_SYNDROME_REMOTE_ACCESS_ERR:
 309                 wc->status = IB_WC_REM_ACCESS_ERR;
 310                 break;
 311         case MLX5_CQE_SYNDROME_REMOTE_OP_ERR:
 312                 wc->status = IB_WC_REM_OP_ERR;
 313                 break;
 314         case MLX5_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
 315                 wc->status = IB_WC_RETRY_EXC_ERR;
 316                 dump = 0;
 317                 break;
 318         case MLX5_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
 319                 wc->status = IB_WC_RNR_RETRY_EXC_ERR;
 320                 dump = 0;
 321                 break;
 322         case MLX5_CQE_SYNDROME_REMOTE_ABORTED_ERR:
 323                 wc->status = IB_WC_REM_ABORT_ERR;
 324                 break;
 325         default:
 326                 wc->status = IB_WC_GENERAL_ERR;
 327                 break;
 328         }
 329
 330         wc->vendor_err = cqe->vendor_err_synd;
 331         if (dump)
 332                 dump_cqe(dev, cqe);
 333 }
 334
 335 static void handle_atomics(struct mlx5_ib_qp *qp, struct mlx5_cqe64 *cqe64,
 336                            u16 tail, u16 head)
 337 {
 338         u16 idx;
 339
 340         do {
 341                 idx = tail & (qp->sq.wqe_cnt - 1);
 342                 if (idx == head)
 343                         break;
 344
 345                 tail = qp->sq.w_list[idx].next;
 346         } while (1);
 347         tail = qp->sq.w_list[idx].next;
 348         qp->sq.last_poll = tail;
 349 }
 350
 351 static void free_cq_buf(struct mlx5_ib_dev *dev, struct mlx5_ib_cq_buf *buf)
 352 {
 353         mlx5_frag_buf_free(dev->mdev, &buf->frag_buf);
 354 }
 355
 356 static void get_sig_err_item(struct mlx5_sig_err_cqe *cqe,
 357                              struct ib_sig_err *item)
 358 {
 359         u16 syndrome = be16_to_cpu(cqe->syndrome);
 360
 361 #define GUARD_ERR   (1 << 13)
 362 #define APPTAG_ERR  (1 << 12)
 363 #define REFTAG_ERR  (1 << 11)
 364
 365         if (syndrome & GUARD_ERR) {
 366                 item->err_type = IB_SIG_BAD_GUARD;
 367                 item->expected = be32_to_cpu(cqe->expected_trans_sig) >> 16;
 368                 item->actual = be32_to_cpu(cqe->actual_trans_sig) >> 16;
 369         } else
 370         if (syndrome & REFTAG_ERR) {
 371                 item->err_type = IB_SIG_BAD_REFTAG;
 372                 item->expected = be32_to_cpu(cqe->expected_reftag);
 373                 item->actual = be32_to_cpu(cqe->actual_reftag);
 374         } else
 375         if (syndrome & APPTAG_ERR) {
 376                 item->err_type = IB_SIG_BAD_APPTAG;
 377                 item->expected = be32_to_cpu(cqe->expected_trans_sig) & 0xffff;
 378                 item->actual = be32_to_cpu(cqe->actual_trans_sig) & 0xffff;
 379         } else {
 380                 pr_err("Got signature completion error with bad syndrome %04x\n",
 381                        syndrome);
 382         }
 383
 384         item->sig_err_offset = be64_to_cpu(cqe->err_offset);
 385         item->key = be32_to_cpu(cqe->mkey);
 386 }
 387
 388 static void sw_comp(struct mlx5_ib_qp *qp, int num_entries, struct ib_wc *wc,
 389                     int *npolled, bool is_send)
 390 {
 391         struct mlx5_ib_wq *wq;
 392         unsigned int cur;
 393         int np;
 394         int i;
 395
 396         wq = (is_send) ? &qp->sq : &qp->rq;
 397         cur = wq->head - wq->tail;
 398         np = *npolled;
 399
 400         if (cur == 0)
 401                 return;
 402
 403         for (i = 0;  i < cur && np < num_entries; i++) {
 404                 unsigned int idx;
 405
 406                 idx = (is_send) ? wq->last_poll : wq->tail;
 407                 idx &= (wq->wqe_cnt - 1);
 408                 wc->wr_id = wq->wrid[idx];
 409                 wc->status = IB_WC_WR_FLUSH_ERR;
 410                 wc->vendor_err = MLX5_CQE_SYNDROME_WR_FLUSH_ERR;
 411                 wq->tail++;
 412                 if (is_send)
 413                         wq->last_poll = wq->w_list[idx].next;
 414                 np++;
 415                 wc->qp = &qp->ibqp;
 416                 wc++;
 417         }
 418         *npolled = np;
 419 }
 420
 421 static void mlx5_ib_poll_sw_comp(struct mlx5_ib_cq *cq, int num_entries,
 422                                  struct ib_wc *wc, int *npolled)
 423 {
 424         struct mlx5_ib_qp *qp;
 425
 426         *npolled = 0;
 427         /* Find uncompleted WQEs belonging to that cq and return mmics ones */
 428         list_for_each_entry(qp, &cq->list_send_qp, cq_send_list) {
 429                 sw_comp(qp, num_entries, wc + *npolled, npolled, true);
 430                 if (*npolled >= num_entries)
 431                         return;
 432         }
 433
 434         list_for_each_entry(qp, &cq->list_recv_qp, cq_recv_list) {
 435                 sw_comp(qp, num_entries, wc + *npolled, npolled, false);
 436                 if (*npolled >= num_entries)
 437                         return;
 438         }
 439 }
 440
 441 static int mlx5_poll_one(struct mlx5_ib_cq *cq,
 442                          struct mlx5_ib_qp **cur_qp,
 443                          struct ib_wc *wc)
 444 {
 445         struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
 446         struct mlx5_err_cqe *err_cqe;
 447         struct mlx5_cqe64 *cqe64;
 448         struct mlx5_core_qp *mqp;
 449         struct mlx5_ib_wq *wq;
 450         uint8_t opcode;
 451         uint32_t qpn;
 452         u16 wqe_ctr;
 453         void *cqe;
 454         int idx;
 455
 456 repoll:
 457         cqe = next_cqe_sw(cq);
 458         if (!cqe)
 459                 return -EAGAIN;
 460
 461         cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64;
 462
 463         ++cq->mcq.cons_index;
 464
 465         /* Make sure we read CQ entry contents after we've checked the
 466          * ownership bit.
 467          */
 468         rmb();
 469
 470         opcode = get_cqe_opcode(cqe64);
 471         if (unlikely(opcode == MLX5_CQE_RESIZE_CQ)) {
 472                 if (likely(cq->resize_buf)) {
 473                         free_cq_buf(dev, &cq->buf);
 474                         cq->buf = *cq->resize_buf;
 475                         kfree(cq->resize_buf);
 476                         cq->resize_buf = NULL;
 477                         goto repoll;
 478                 } else {
 479                         mlx5_ib_warn(dev, "unexpected resize cqe\n");
 480                 }
 481         }
 482
 483         qpn = ntohl(cqe64->sop_drop_qpn) & 0xffffff;
 484         if (!*cur_qp || (qpn != (*cur_qp)->ibqp.qp_num)) {
 485                 /* We do not have to take the QP table lock here,
 486                  * because CQs will be locked while QPs are removed
 487                  * from the table.
 488                  */
 489                 mqp = radix_tree_lookup(&dev->qp_table.tree, qpn);
 490                 *cur_qp = to_mibqp(mqp);
 491         }
 492
 493         wc->qp  = &(*cur_qp)->ibqp;
 494         switch (opcode) {
 495         case MLX5_CQE_REQ:
 496                 wq = &(*cur_qp)->sq;
 497                 wqe_ctr = be16_to_cpu(cqe64->wqe_counter);
 498                 idx = wqe_ctr & (wq->wqe_cnt - 1);
 499                 handle_good_req(wc, cqe64, wq, idx);
 500                 handle_atomics(*cur_qp, cqe64, wq->last_poll, idx);
 501                 wc->wr_id = wq->wrid[idx];
 502                 wq->tail = wq->wqe_head[idx] + 1;
 503                 wc->status = IB_WC_SUCCESS;
 504                 break;
 505         case MLX5_CQE_RESP_WR_IMM:
 506         case MLX5_CQE_RESP_SEND:
 507         case MLX5_CQE_RESP_SEND_IMM:
 508         case MLX5_CQE_RESP_SEND_INV:
 509                 handle_responder(wc, cqe64, *cur_qp);
 510                 wc->status = IB_WC_SUCCESS;
 511                 break;
 512         case MLX5_CQE_RESIZE_CQ:
 513                 break;
 514         case MLX5_CQE_REQ_ERR:
 515         case MLX5_CQE_RESP_ERR:
 516                 err_cqe = (struct mlx5_err_cqe *)cqe64;
 517                 mlx5_handle_error_cqe(dev, err_cqe, wc);
 518                 mlx5_ib_dbg(dev, "%s error cqe on cqn 0x%x:\n",
 519                             opcode == MLX5_CQE_REQ_ERR ?
 520                             "Requestor" : "Responder", cq->mcq.cqn);
 521                 mlx5_ib_dbg(dev, "syndrome 0x%x, vendor syndrome 0x%x\n",
 522                             err_cqe->syndrome, err_cqe->vendor_err_synd);
 523                 if (opcode == MLX5_CQE_REQ_ERR) {
 524                         wq = &(*cur_qp)->sq;
 525                         wqe_ctr = be16_to_cpu(cqe64->wqe_counter);
 526                         idx = wqe_ctr & (wq->wqe_cnt - 1);
 527                         wc->wr_id = wq->wrid[idx];
 528                         wq->tail = wq->wqe_head[idx] + 1;
 529                 } else {
 530                         struct mlx5_ib_srq *srq;
 531
 532                         if ((*cur_qp)->ibqp.srq) {
 533                                 srq = to_msrq((*cur_qp)->ibqp.srq);
 534                                 wqe_ctr = be16_to_cpu(cqe64->wqe_counter);
 535                                 wc->wr_id = srq->wrid[wqe_ctr];
 536                                 mlx5_ib_free_srq_wqe(srq, wqe_ctr);
 537                         } else {
 538                                 wq = &(*cur_qp)->rq;
 539                                 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
 540                                 ++wq->tail;
 541                         }
 542                 }
 543                 break;
 544         case MLX5_CQE_SIG_ERR: {
 545                 struct mlx5_sig_err_cqe *sig_err_cqe =
 546                         (struct mlx5_sig_err_cqe *)cqe64;
 547                 struct mlx5_core_sig_ctx *sig;
 548
 549                 xa_lock(&dev->sig_mrs);
 550                 sig = xa_load(&dev->sig_mrs,
 551                                 mlx5_base_mkey(be32_to_cpu(sig_err_cqe->mkey)));
 552                 get_sig_err_item(sig_err_cqe, &sig->err_item);
 553                 sig->sig_err_exists = true;
 554                 sig->sigerr_count++;
 555
 556                 mlx5_ib_warn(dev, "CQN: 0x%x Got SIGERR on key: 0x%x err_type %x err_offset %llx expected %x actual %x\n",
 557                              cq->mcq.cqn, sig->err_item.key,
 558                              sig->err_item.err_type,
 559                              sig->err_item.sig_err_offset,
 560                              sig->err_item.expected,
 561                              sig->err_item.actual);
 562
 563                 xa_unlock(&dev->sig_mrs);
 564                 goto repoll;
 565         }
 566         }
 567
 568         return 0;
 569 }
 570
 571 static int poll_soft_wc(struct mlx5_ib_cq *cq, int num_entries,
 572                         struct ib_wc *wc, bool is_fatal_err)
 573 {
 574         struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
 575         struct mlx5_ib_wc *soft_wc, *next;
 576         int npolled = 0;
 577
 578         list_for_each_entry_safe(soft_wc, next, &cq->wc_list, list) {
 579                 if (npolled >= num_entries)
 580                         break;
 581
 582                 mlx5_ib_dbg(dev, "polled software generated completion on CQ 0x%x\n",
 583                             cq->mcq.cqn);
 584
 585                 if (unlikely(is_fatal_err)) {
 586                         soft_wc->wc.status = IB_WC_WR_FLUSH_ERR;
 587                         soft_wc->wc.vendor_err = MLX5_CQE_SYNDROME_WR_FLUSH_ERR;
 588                 }
 589                 wc[npolled++] = soft_wc->wc;
 590                 list_del(&soft_wc->list);
 591                 kfree(soft_wc);
 592         }
 593
 594         return npolled;
 595 }
 596
 597 int mlx5_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 598 {
 599         struct mlx5_ib_cq *cq = to_mcq(ibcq);
 600         struct mlx5_ib_qp *cur_qp = NULL;
 601         struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
 602         struct mlx5_core_dev *mdev = dev->mdev;
 603         unsigned long flags;
 604         int soft_polled = 0;
 605         int npolled;
 606
 607         spin_lock_irqsave(&cq->lock, flags);
 608         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 609                 /* make sure no soft wqe's are waiting */
 610                 if (unlikely(!list_empty(&cq->wc_list)))
 611                         soft_polled = poll_soft_wc(cq, num_entries, wc, true);
 612
 613                 mlx5_ib_poll_sw_comp(cq, num_entries - soft_polled,
 614                                      wc + soft_polled, &npolled);
 615                 goto out;
 616         }
 617
 618         if (unlikely(!list_empty(&cq->wc_list)))
 619                 soft_polled = poll_soft_wc(cq, num_entries, wc, false);
 620
 621         for (npolled = 0; npolled < num_entries - soft_polled; npolled++) {
 622                 if (mlx5_poll_one(cq, &cur_qp, wc + soft_polled + npolled))
 623                         break;
 624         }
 625
 626         if (npolled)
 627                 mlx5_cq_set_ci(&cq->mcq);
 628 out:
 629         spin_unlock_irqrestore(&cq->lock, flags);
 630
 631         return soft_polled + npolled;
 632 }
 633
 634 int mlx5_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
 635 {
 636         struct mlx5_core_dev *mdev = to_mdev(ibcq->device)->mdev;
 637         struct mlx5_ib_cq *cq = to_mcq(ibcq);
 638         void __iomem *uar_page = mdev->priv.uar->map;
 639         unsigned long irq_flags;
 640         int ret = 0;
 641
 642         spin_lock_irqsave(&cq->lock, irq_flags);
 643         if (cq->notify_flags != IB_CQ_NEXT_COMP)
 644                 cq->notify_flags = flags & IB_CQ_SOLICITED_MASK;
 645
 646         if ((flags & IB_CQ_REPORT_MISSED_EVENTS) && !list_empty(&cq->wc_list))
 647                 ret = 1;
 648         spin_unlock_irqrestore(&cq->lock, irq_flags);
 649
 650         mlx5_cq_arm(&cq->mcq,
 651                     (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
 652                     MLX5_CQ_DB_REQ_NOT_SOL : MLX5_CQ_DB_REQ_NOT,
 653                     uar_page, to_mcq(ibcq)->mcq.cons_index);
 654
 655         return ret;
 656 }
 657
 658 static int alloc_cq_frag_buf(struct mlx5_ib_dev *dev,
 659                              struct mlx5_ib_cq_buf *buf,
 660                              int nent,
 661                              int cqe_size)
 662 {
 663         struct mlx5_frag_buf *frag_buf = &buf->frag_buf;
 664         u8 log_wq_stride = 6 + (cqe_size == 128 ? 1 : 0);
 665         u8 log_wq_sz     = ilog2(cqe_size);
 666         int err;
 667
 668         err = mlx5_frag_buf_alloc_node(dev->mdev,
 669                                        nent * cqe_size,
 670                                        frag_buf,
 671                                        dev->mdev->priv.numa_node);
 672         if (err)
 673                 return err;
 674
 675         mlx5_init_fbc(frag_buf->frags, log_wq_stride, log_wq_sz, &buf->fbc);
 676
 677         buf->cqe_size = cqe_size;
 678         buf->nent = nent;
 679
 680         return 0;
 681 }
 682
 683 enum {
 684         MLX5_CQE_RES_FORMAT_HASH = 0,
 685         MLX5_CQE_RES_FORMAT_CSUM = 1,
 686         MLX5_CQE_RES_FORMAT_CSUM_STRIDX = 3,
 687 };
 688
 689 static int mini_cqe_res_format_to_hw(struct mlx5_ib_dev *dev, u8 format)
 690 {
 691         switch (format) {
 692         case MLX5_IB_CQE_RES_FORMAT_HASH:
 693                 return MLX5_CQE_RES_FORMAT_HASH;
 694         case MLX5_IB_CQE_RES_FORMAT_CSUM:
 695                 return MLX5_CQE_RES_FORMAT_CSUM;
 696         case MLX5_IB_CQE_RES_FORMAT_CSUM_STRIDX:
 697                 if (MLX5_CAP_GEN(dev->mdev, mini_cqe_resp_stride_index))
 698                         return MLX5_CQE_RES_FORMAT_CSUM_STRIDX;
 699                 return -EOPNOTSUPP;
 700         default:
 701                 return -EINVAL;
 702         }
 703 }
 704
 705 static int create_cq_user(struct mlx5_ib_dev *dev, struct ib_udata *udata,
 706                           struct mlx5_ib_cq *cq, int entries, u32 **cqb,
 707                           int *cqe_size, int *index, int *inlen)
 708 {
 709         struct mlx5_ib_create_cq ucmd = {};
 710         unsigned long page_size;
 711         unsigned int page_offset_quantized;
 712         size_t ucmdlen;
 713         __be64 *pas;
 714         int ncont;
 715         void *cqc;
 716         int err;
 717         struct mlx5_ib_ucontext *context = rdma_udata_to_drv_context(
 718                 udata, struct mlx5_ib_ucontext, ibucontext);
 719
 720         ucmdlen = min(udata->inlen, sizeof(ucmd));
 721         if (ucmdlen < offsetof(struct mlx5_ib_create_cq, flags))
 722                 return -EINVAL;
 723
 724         if (ib_copy_from_udata(&ucmd, udata, ucmdlen))
 725                 return -EFAULT;
 726
 727         if ((ucmd.flags & ~(MLX5_IB_CREATE_CQ_FLAGS_CQE_128B_PAD |
 728                             MLX5_IB_CREATE_CQ_FLAGS_UAR_PAGE_INDEX |
 729                             MLX5_IB_CREATE_CQ_FLAGS_REAL_TIME_TS)))
 730                 return -EINVAL;
 731
 732         if ((ucmd.cqe_size != 64 && ucmd.cqe_size != 128) ||
 733             ucmd.reserved0 || ucmd.reserved1)
 734                 return -EINVAL;
 735
 736         *cqe_size = ucmd.cqe_size;
 737
 738         cq->buf.umem =
 739                 ib_umem_get(&dev->ib_dev, ucmd.buf_addr,
 740                             entries * ucmd.cqe_size, IB_ACCESS_LOCAL_WRITE);
 741         if (IS_ERR(cq->buf.umem)) {
 742                 err = PTR_ERR(cq->buf.umem);
 743                 return err;
 744         }
 745
 746         page_size = mlx5_umem_find_best_cq_quantized_pgoff(
 747                 cq->buf.umem, cqc, log_page_size, MLX5_ADAPTER_PAGE_SHIFT,
 748                 page_offset, 64, &page_offset_quantized);
 749         if (!page_size) {
 750                 err = -EINVAL;
 751                 goto err_umem;
 752         }
 753
 754         err = mlx5_ib_db_map_user(context, ucmd.db_addr, &cq->db);
 755         if (err)
 756                 goto err_umem;
 757
 758         ncont = ib_umem_num_dma_blocks(cq->buf.umem, page_size);
 759         mlx5_ib_dbg(
 760                 dev,
 761                 "addr 0x%llx, size %u, npages %zu, page_size %lu, ncont %d\n",
 762                 ucmd.buf_addr, entries * ucmd.cqe_size,
 763                 ib_umem_num_pages(cq->buf.umem), page_size, ncont);
 764
 765         *inlen = MLX5_ST_SZ_BYTES(create_cq_in) +
 766                  MLX5_FLD_SZ_BYTES(create_cq_in, pas[0]) * ncont;
 767         *cqb = kvzalloc(*inlen, GFP_KERNEL);
 768         if (!*cqb) {
 769                 err = -ENOMEM;
 770                 goto err_db;
 771         }
 772
 773         pas = (__be64 *)MLX5_ADDR_OF(create_cq_in, *cqb, pas);
 774         mlx5_ib_populate_pas(cq->buf.umem, page_size, pas, 0);
 775
 776         cqc = MLX5_ADDR_OF(create_cq_in, *cqb, cq_context);
 777         MLX5_SET(cqc, cqc, log_page_size,
 778                  order_base_2(page_size) - MLX5_ADAPTER_PAGE_SHIFT);
 779         MLX5_SET(cqc, cqc, page_offset, page_offset_quantized);
 780
 781         if (ucmd.flags & MLX5_IB_CREATE_CQ_FLAGS_UAR_PAGE_INDEX) {
 782                 *index = ucmd.uar_page_index;
 783         } else if (context->bfregi.lib_uar_dyn) {
 784                 err = -EINVAL;
 785                 goto err_cqb;
 786         } else {
 787                 *index = context->bfregi.sys_pages[0];
 788         }
 789
 790         if (ucmd.cqe_comp_en == 1) {
 791                 int mini_cqe_format;
 792
 793                 if (!((*cqe_size == 128 &&
 794                        MLX5_CAP_GEN(dev->mdev, cqe_compression_128)) ||
 795                       (*cqe_size == 64  &&
 796                        MLX5_CAP_GEN(dev->mdev, cqe_compression)))) {
 797                         err = -EOPNOTSUPP;
 798                         mlx5_ib_warn(dev, "CQE compression is not supported for size %d!\n",
 799                                      *cqe_size);
 800                         goto err_cqb;
 801                 }
 802
 803                 mini_cqe_format =
 804                         mini_cqe_res_format_to_hw(dev,
 805                                                   ucmd.cqe_comp_res_format);
 806                 if (mini_cqe_format < 0) {
 807                         err = mini_cqe_format;
 808                         mlx5_ib_dbg(dev, "CQE compression res format %d error: %d\n",
 809                                     ucmd.cqe_comp_res_format, err);
 810                         goto err_cqb;
 811                 }
 812
 813                 MLX5_SET(cqc, cqc, cqe_comp_en, 1);
 814                 MLX5_SET(cqc, cqc, mini_cqe_res_format, mini_cqe_format);
 815         }
 816
 817         if (ucmd.flags & MLX5_IB_CREATE_CQ_FLAGS_CQE_128B_PAD) {
 818                 if (*cqe_size != 128 ||
 819                     !MLX5_CAP_GEN(dev->mdev, cqe_128_always)) {
 820                         err = -EOPNOTSUPP;
 821                         mlx5_ib_warn(dev,
 822                                      "CQE padding is not supported for CQE size of %dB!\n",
 823                                      *cqe_size);
 824                         goto err_cqb;
 825                 }
 826
 827                 cq->private_flags |= MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD;
 828         }
 829
 830         if (ucmd.flags & MLX5_IB_CREATE_CQ_FLAGS_REAL_TIME_TS)
 831                 cq->private_flags |= MLX5_IB_CQ_PR_FLAGS_REAL_TIME_TS;
 832
 833         MLX5_SET(create_cq_in, *cqb, uid, context->devx_uid);
 834         return 0;
 835
 836 err_cqb:
 837         kvfree(*cqb);
 838
 839 err_db:
 840         mlx5_ib_db_unmap_user(context, &cq->db);
 841
 842 err_umem:
 843         ib_umem_release(cq->buf.umem);
 844         return err;
 845 }
 846
 847 static void destroy_cq_user(struct mlx5_ib_cq *cq, struct ib_udata *udata)
 848 {
 849         struct mlx5_ib_ucontext *context = rdma_udata_to_drv_context(
 850                 udata, struct mlx5_ib_ucontext, ibucontext);
 851
 852         mlx5_ib_db_unmap_user(context, &cq->db);
 853         ib_umem_release(cq->buf.umem);
 854 }
 855
 856 static void init_cq_frag_buf(struct mlx5_ib_cq_buf *buf)
 857 {
 858         int i;
 859         void *cqe;
 860         struct mlx5_cqe64 *cqe64;
 861
 862         for (i = 0; i < buf->nent; i++) {
 863                 cqe = mlx5_frag_buf_get_wqe(&buf->fbc, i);
 864                 cqe64 = buf->cqe_size == 64 ? cqe : cqe + 64;
 865                 cqe64->op_own = MLX5_CQE_INVALID << 4;
 866         }
 867 }
 868
 869 static int create_cq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
 870                             int entries, int cqe_size,
 871                             u32 **cqb, int *index, int *inlen)
 872 {
 873         __be64 *pas;
 874         void *cqc;
 875         int err;
 876
 877         err = mlx5_db_alloc(dev->mdev, &cq->db);
 878         if (err)
 879                 return err;
 880
 881         cq->mcq.set_ci_db  = cq->db.db;
 882         cq->mcq.arm_db     = cq->db.db + 1;
 883         cq->mcq.cqe_sz = cqe_size;
 884
 885         err = alloc_cq_frag_buf(dev, &cq->buf, entries, cqe_size);
 886         if (err)
 887                 goto err_db;
 888
 889         init_cq_frag_buf(&cq->buf);
 890
 891         *inlen = MLX5_ST_SZ_BYTES(create_cq_in) +
 892                  MLX5_FLD_SZ_BYTES(create_cq_in, pas[0]) *
 893                  cq->buf.frag_buf.npages;
 894         *cqb = kvzalloc(*inlen, GFP_KERNEL);
 895         if (!*cqb) {
 896                 err = -ENOMEM;
 897                 goto err_buf;
 898         }
 899
 900         pas = (__be64 *)MLX5_ADDR_OF(create_cq_in, *cqb, pas);
 901         mlx5_fill_page_frag_array(&cq->buf.frag_buf, pas);
 902
 903         cqc = MLX5_ADDR_OF(create_cq_in, *cqb, cq_context);
 904         MLX5_SET(cqc, cqc, log_page_size,
 905                  cq->buf.frag_buf.page_shift -
 906                  MLX5_ADAPTER_PAGE_SHIFT);
 907
 908         *index = dev->mdev->priv.uar->index;
 909
 910         return 0;
 911
 912 err_buf:
 913         free_cq_buf(dev, &cq->buf);
 914
 915 err_db:
 916         mlx5_db_free(dev->mdev, &cq->db);
 917         return err;
 918 }
 919
 920 static void destroy_cq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq)
 921 {
 922         free_cq_buf(dev, &cq->buf);
 923         mlx5_db_free(dev->mdev, &cq->db);
 924 }
 925
 926 static void notify_soft_wc_handler(struct work_struct *work)
 927 {
 928         struct mlx5_ib_cq *cq = container_of(work, struct mlx5_ib_cq,
 929                                              notify_work);
 930
 931         cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
 932 }
 933
 934 int mlx5_ib_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
 935                       struct ib_udata *udata)
 936 {
 937         struct ib_device *ibdev = ibcq->device;
 938         int entries = attr->cqe;
 939         int vector = attr->comp_vector;
 940         struct mlx5_ib_dev *dev = to_mdev(ibdev);
 941         struct mlx5_ib_cq *cq = to_mcq(ibcq);
 942         u32 out[MLX5_ST_SZ_DW(create_cq_out)];
 943         int index;
 944         int inlen;
 945         u32 *cqb = NULL;
 946         void *cqc;
 947         int cqe_size;
 948         int eqn;
 949         int err;
 950
 951         if (entries < 0 ||
 952             (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz))))
 953                 return -EINVAL;
 954
 955         if (check_cq_create_flags(attr->flags))
 956                 return -EOPNOTSUPP;
 957
 958         entries = roundup_pow_of_two(entries + 1);
 959         if (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz)))
 960                 return -EINVAL;
 961
 962         cq->ibcq.cqe = entries - 1;
 963         mutex_init(&cq->resize_mutex);
 964         spin_lock_init(&cq->lock);
 965         cq->resize_buf = NULL;
 966         cq->resize_umem = NULL;
 967         cq->create_flags = attr->flags;
 968         INIT_LIST_HEAD(&cq->list_send_qp);
 969         INIT_LIST_HEAD(&cq->list_recv_qp);
 970
 971         if (udata) {
 972                 err = create_cq_user(dev, udata, cq, entries, &cqb, &cqe_size,
 973                                      &index, &inlen);
 974                 if (err)
 975                         return err;
 976         } else {
 977                 cqe_size = cache_line_size() == 128 ? 128 : 64;
 978                 err = create_cq_kernel(dev, cq, entries, cqe_size, &cqb,
 979                                        &index, &inlen);
 980                 if (err)
 981                         return err;
 982
 983                 INIT_WORK(&cq->notify_work, notify_soft_wc_handler);
 984         }
 985
 986         err = mlx5_vector2eqn(dev->mdev, vector, &eqn);
 987         if (err)
 988                 goto err_cqb;
 989
 990         cq->cqe_size = cqe_size;
 991
 992         cqc = MLX5_ADDR_OF(create_cq_in, cqb, cq_context);
 993         MLX5_SET(cqc, cqc, cqe_sz,
 994                  cqe_sz_to_mlx_sz(cqe_size,
 995                                   cq->private_flags &
 996                                   MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD));
 997         MLX5_SET(cqc, cqc, log_cq_size, ilog2(entries));
 998         MLX5_SET(cqc, cqc, uar_page, index);
 999         MLX5_SET(cqc, cqc, c_eqn_or_apu_element, eqn);
1000         MLX5_SET64(cqc, cqc, dbr_addr, cq->db.dma);
1001         if (cq->create_flags & IB_UVERBS_CQ_FLAGS_IGNORE_OVERRUN)
1002                 MLX5_SET(cqc, cqc, oi, 1);
1003
1004         err = mlx5_core_create_cq(dev->mdev, &cq->mcq, cqb, inlen, out, sizeof(out));
1005         if (err)
1006                 goto err_cqb;
1007
1008         mlx5_ib_dbg(dev, "cqn 0x%x\n", cq->mcq.cqn);
1009         if (udata)
1010                 cq->mcq.tasklet_ctx.comp = mlx5_ib_cq_comp;
1011         else
1012                 cq->mcq.comp  = mlx5_ib_cq_comp;
1013         cq->mcq.event = mlx5_ib_cq_event;
1014
1015         INIT_LIST_HEAD(&cq->wc_list);
1016
1017         if (udata)
1018                 if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof(__u32))) {
1019                         err = -EFAULT;
1020                         goto err_cmd;
1021                 }
1022
1023
1024         kvfree(cqb);
1025         return 0;
1026
1027 err_cmd:
1028         mlx5_core_destroy_cq(dev->mdev, &cq->mcq);
1029
1030 err_cqb:
1031         kvfree(cqb);
1032         if (udata)
1033                 destroy_cq_user(cq, udata);
1034         else
1035                 destroy_cq_kernel(dev, cq);
1036         return err;
1037 }
1038
1039 int mlx5_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata)
1040 {
1041         struct mlx5_ib_dev *dev = to_mdev(cq->device);
1042         struct mlx5_ib_cq *mcq = to_mcq(cq);
1043         int ret;
1044
1045         ret = mlx5_core_destroy_cq(dev->mdev, &mcq->mcq);
1046         if (ret)
1047                 return ret;
1048
1049         if (udata)
1050                 destroy_cq_user(mcq, udata);
1051         else
1052                 destroy_cq_kernel(dev, mcq);
1053         return 0;
1054 }
1055
1056 static int is_equal_rsn(struct mlx5_cqe64 *cqe64, u32 rsn)
1057 {
1058         return rsn == (ntohl(cqe64->sop_drop_qpn) & 0xffffff);
1059 }
1060
1061 void __mlx5_ib_cq_clean(struct mlx5_ib_cq *cq, u32 rsn, struct mlx5_ib_srq *srq)
1062 {
1063         struct mlx5_cqe64 *cqe64, *dest64;
1064         void *cqe, *dest;
1065         u32 prod_index;
1066         int nfreed = 0;
1067         u8 owner_bit;
1068
1069         if (!cq)
1070                 return;
1071
1072         /* First we need to find the current producer index, so we
1073          * know where to start cleaning from.  It doesn't matter if HW
1074          * adds new entries after this loop -- the QP we're worried
1075          * about is already in RESET, so the new entries won't come
1076          * from our QP and therefore don't need to be checked.
1077          */
1078         for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); prod_index++)
1079                 if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
1080                         break;
1081
1082         /* Now sweep backwards through the CQ, removing CQ entries
1083          * that match our QP by copying older entries on top of them.
1084          */
1085         while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
1086                 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
1087                 cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64;
1088                 if (is_equal_rsn(cqe64, rsn)) {
1089                         if (srq && (ntohl(cqe64->srqn) & 0xffffff))
1090                                 mlx5_ib_free_srq_wqe(srq, be16_to_cpu(cqe64->wqe_counter));
1091                         ++nfreed;
1092                 } else if (nfreed) {
1093                         dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe);
1094                         dest64 = (cq->mcq.cqe_sz == 64) ? dest : dest + 64;
1095                         owner_bit = dest64->op_own & MLX5_CQE_OWNER_MASK;
1096                         memcpy(dest, cqe, cq->mcq.cqe_sz);
1097                         dest64->op_own = owner_bit |
1098                                 (dest64->op_own & ~MLX5_CQE_OWNER_MASK);
1099                 }
1100         }
1101
1102         if (nfreed) {
1103                 cq->mcq.cons_index += nfreed;
1104                 /* Make sure update of buffer contents is done before
1105                  * updating consumer index.
1106                  */
1107                 wmb();
1108                 mlx5_cq_set_ci(&cq->mcq);
1109         }
1110 }
1111
1112 void mlx5_ib_cq_clean(struct mlx5_ib_cq *cq, u32 qpn, struct mlx5_ib_srq *srq)
1113 {
1114         if (!cq)
1115                 return;
1116
1117         spin_lock_irq(&cq->lock);
1118         __mlx5_ib_cq_clean(cq, qpn, srq);
1119         spin_unlock_irq(&cq->lock);
1120 }
1121
1122 int mlx5_ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
1123 {
1124         struct mlx5_ib_dev *dev = to_mdev(cq->device);
1125         struct mlx5_ib_cq *mcq = to_mcq(cq);
1126         int err;
1127
1128         if (!MLX5_CAP_GEN(dev->mdev, cq_moderation))
1129                 return -EOPNOTSUPP;
1130
1131         if (cq_period > MLX5_MAX_CQ_PERIOD)
1132                 return -EINVAL;
1133
1134         err = mlx5_core_modify_cq_moderation(dev->mdev, &mcq->mcq,
1135                                              cq_period, cq_count);
1136         if (err)
1137                 mlx5_ib_warn(dev, "modify cq 0x%x failed\n", mcq->mcq.cqn);
1138
1139         return err;
1140 }
1141
1142 static int resize_user(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
1143                        int entries, struct ib_udata *udata,
1144                        int *cqe_size)
1145 {
1146         struct mlx5_ib_resize_cq ucmd;
1147         struct ib_umem *umem;
1148         int err;
1149
1150         err = ib_copy_from_udata(&ucmd, udata, sizeof(ucmd));
1151         if (err)
1152                 return err;
1153
1154         if (ucmd.reserved0 || ucmd.reserved1)
1155                 return -EINVAL;
1156
1157         /* check multiplication overflow */
1158         if (ucmd.cqe_size && SIZE_MAX / ucmd.cqe_size <= entries - 1)
1159                 return -EINVAL;
1160
1161         umem = ib_umem_get(&dev->ib_dev, ucmd.buf_addr,
1162                            (size_t)ucmd.cqe_size * entries,
1163                            IB_ACCESS_LOCAL_WRITE);
1164         if (IS_ERR(umem)) {
1165                 err = PTR_ERR(umem);
1166                 return err;
1167         }
1168
1169         cq->resize_umem = umem;
1170         *cqe_size = ucmd.cqe_size;
1171
1172         return 0;
1173 }
1174
1175 static int resize_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
1176                          int entries, int cqe_size)
1177 {
1178         int err;
1179
1180         cq->resize_buf = kzalloc(sizeof(*cq->resize_buf), GFP_KERNEL);
1181         if (!cq->resize_buf)
1182                 return -ENOMEM;
1183
1184         err = alloc_cq_frag_buf(dev, cq->resize_buf, entries, cqe_size);
1185         if (err)
1186                 goto ex;
1187
1188         init_cq_frag_buf(cq->resize_buf);
1189
1190         return 0;
1191
1192 ex:
1193         kfree(cq->resize_buf);
1194         return err;
1195 }
1196
1197 static int copy_resize_cqes(struct mlx5_ib_cq *cq)
1198 {
1199         struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
1200         struct mlx5_cqe64 *scqe64;
1201         struct mlx5_cqe64 *dcqe64;
1202         void *start_cqe;
1203         void *scqe;
1204         void *dcqe;
1205         int ssize;
1206         int dsize;
1207         int i;
1208         u8 sw_own;
1209
1210         ssize = cq->buf.cqe_size;
1211         dsize = cq->resize_buf->cqe_size;
1212         if (ssize != dsize) {
1213                 mlx5_ib_warn(dev, "resize from different cqe size is not supported\n");
1214                 return -EINVAL;
1215         }
1216
1217         i = cq->mcq.cons_index;
1218         scqe = get_sw_cqe(cq, i);
1219         scqe64 = ssize == 64 ? scqe : scqe + 64;
1220         start_cqe = scqe;
1221         if (!scqe) {
1222                 mlx5_ib_warn(dev, "expected cqe in sw ownership\n");
1223                 return -EINVAL;
1224         }
1225
1226         while (get_cqe_opcode(scqe64) != MLX5_CQE_RESIZE_CQ) {
1227                 dcqe = mlx5_frag_buf_get_wqe(&cq->resize_buf->fbc,
1228                                              (i + 1) & cq->resize_buf->nent);
1229                 dcqe64 = dsize == 64 ? dcqe : dcqe + 64;
1230                 sw_own = sw_ownership_bit(i + 1, cq->resize_buf->nent);
1231                 memcpy(dcqe, scqe, dsize);
1232                 dcqe64->op_own = (dcqe64->op_own & ~MLX5_CQE_OWNER_MASK) | sw_own;
1233
1234                 ++i;
1235                 scqe = get_sw_cqe(cq, i);
1236                 scqe64 = ssize == 64 ? scqe : scqe + 64;
1237                 if (!scqe) {
1238                         mlx5_ib_warn(dev, "expected cqe in sw ownership\n");
1239                         return -EINVAL;
1240                 }
1241
1242                 if (scqe == start_cqe) {
1243                         pr_warn("resize CQ failed to get resize CQE, CQN 0x%x\n",
1244                                 cq->mcq.cqn);
1245                         return -ENOMEM;
1246                 }
1247         }
1248         ++cq->mcq.cons_index;
1249         return 0;
1250 }
1251
1252 int mlx5_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
1253 {
1254         struct mlx5_ib_dev *dev = to_mdev(ibcq->device);
1255         struct mlx5_ib_cq *cq = to_mcq(ibcq);
1256         void *cqc;
1257         u32 *in;
1258         int err;
1259         int npas;
1260         __be64 *pas;
1261         unsigned int page_offset_quantized = 0;
1262         unsigned int page_shift;
1263         int inlen;
1264         int cqe_size;
1265         unsigned long flags;
1266
1267         if (!MLX5_CAP_GEN(dev->mdev, cq_resize)) {
1268                 pr_info("Firmware does not support resize CQ\n");
1269                 return -ENOSYS;
1270         }
1271
1272         if (entries < 1 ||
1273             entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz))) {
1274                 mlx5_ib_warn(dev, "wrong entries number %d, max %d\n",
1275                              entries,
1276                              1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz));
1277                 return -EINVAL;
1278         }
1279
1280         entries = roundup_pow_of_two(entries + 1);
1281         if (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz)) + 1)
1282                 return -EINVAL;
1283
1284         if (entries == ibcq->cqe + 1)
1285                 return 0;
1286
1287         mutex_lock(&cq->resize_mutex);
1288         if (udata) {
1289                 unsigned long page_size;
1290
1291                 err = resize_user(dev, cq, entries, udata, &cqe_size);
1292                 if (err)
1293                         goto ex;
1294
1295                 page_size = mlx5_umem_find_best_cq_quantized_pgoff(
1296                         cq->resize_umem, cqc, log_page_size,
1297                         MLX5_ADAPTER_PAGE_SHIFT, page_offset, 64,
1298                         &page_offset_quantized);
1299                 if (!page_size) {
1300                         err = -EINVAL;
1301                         goto ex_resize;
1302                 }
1303                 npas = ib_umem_num_dma_blocks(cq->resize_umem, page_size);
1304                 page_shift = order_base_2(page_size);
1305         } else {
1306                 struct mlx5_frag_buf *frag_buf;
1307
1308                 cqe_size = 64;
1309                 err = resize_kernel(dev, cq, entries, cqe_size);
1310                 if (err)
1311                         goto ex;
1312                 frag_buf = &cq->resize_buf->frag_buf;
1313                 npas = frag_buf->npages;
1314                 page_shift = frag_buf->page_shift;
1315         }
1316
1317         inlen = MLX5_ST_SZ_BYTES(modify_cq_in) +
1318                 MLX5_FLD_SZ_BYTES(modify_cq_in, pas[0]) * npas;
1319
1320         in = kvzalloc(inlen, GFP_KERNEL);
1321         if (!in) {
1322                 err = -ENOMEM;
1323                 goto ex_resize;
1324         }
1325
1326         pas = (__be64 *)MLX5_ADDR_OF(modify_cq_in, in, pas);
1327         if (udata)
1328                 mlx5_ib_populate_pas(cq->resize_umem, 1UL << page_shift, pas,
1329                                      0);
1330         else
1331                 mlx5_fill_page_frag_array(&cq->resize_buf->frag_buf, pas);
1332
1333         MLX5_SET(modify_cq_in, in,
1334                  modify_field_select_resize_field_select.resize_field_select.resize_field_select,
1335                  MLX5_MODIFY_CQ_MASK_LOG_SIZE  |
1336                  MLX5_MODIFY_CQ_MASK_PG_OFFSET |
1337                  MLX5_MODIFY_CQ_MASK_PG_SIZE);
1338
1339         cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context);
1340
1341         MLX5_SET(cqc, cqc, log_page_size,
1342                  page_shift - MLX5_ADAPTER_PAGE_SHIFT);
1343         MLX5_SET(cqc, cqc, page_offset, page_offset_quantized);
1344         MLX5_SET(cqc, cqc, cqe_sz,
1345                  cqe_sz_to_mlx_sz(cqe_size,
1346                                   cq->private_flags &
1347                                   MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD));
1348         MLX5_SET(cqc, cqc, log_cq_size, ilog2(entries));
1349
1350         MLX5_SET(modify_cq_in, in, op_mod, MLX5_CQ_OPMOD_RESIZE);
1351         MLX5_SET(modify_cq_in, in, cqn, cq->mcq.cqn);
1352
1353         err = mlx5_core_modify_cq(dev->mdev, &cq->mcq, in, inlen);
1354         if (err)
1355                 goto ex_alloc;
1356
1357         if (udata) {
1358                 cq->ibcq.cqe = entries - 1;
1359                 ib_umem_release(cq->buf.umem);
1360                 cq->buf.umem = cq->resize_umem;
1361                 cq->resize_umem = NULL;
1362         } else {
1363                 struct mlx5_ib_cq_buf tbuf;
1364                 int resized = 0;
1365
1366                 spin_lock_irqsave(&cq->lock, flags);
1367                 if (cq->resize_buf) {
1368                         err = copy_resize_cqes(cq);
1369                         if (!err) {
1370                                 tbuf = cq->buf;
1371                                 cq->buf = *cq->resize_buf;
1372                                 kfree(cq->resize_buf);
1373                                 cq->resize_buf = NULL;
1374                                 resized = 1;
1375                         }
1376                 }
1377                 cq->ibcq.cqe = entries - 1;
1378                 spin_unlock_irqrestore(&cq->lock, flags);
1379                 if (resized)
1380                         free_cq_buf(dev, &tbuf);
1381         }
1382         mutex_unlock(&cq->resize_mutex);
1383
1384         kvfree(in);
1385         return 0;
1386
1387 ex_alloc:
1388         kvfree(in);
1389
1390 ex_resize:
1391         ib_umem_release(cq->resize_umem);
1392         if (!udata) {
1393                 free_cq_buf(dev, cq->resize_buf);
1394                 cq->resize_buf = NULL;
1395         }
1396 ex:
1397         mutex_unlock(&cq->resize_mutex);
1398         return err;
1399 }
1400
1401 int mlx5_ib_get_cqe_size(struct ib_cq *ibcq)
1402 {
1403         struct mlx5_ib_cq *cq;
1404
1405         if (!ibcq)
1406                 return 128;
1407
1408         cq = to_mcq(ibcq);
1409         return cq->cqe_size;
1410 }
1411
1412 /* Called from atomic context */
1413 int mlx5_ib_generate_wc(struct ib_cq *ibcq, struct ib_wc *wc)
1414 {
1415         struct mlx5_ib_wc *soft_wc;
1416         struct mlx5_ib_cq *cq = to_mcq(ibcq);
1417         unsigned long flags;
1418
1419         soft_wc = kmalloc(sizeof(*soft_wc), GFP_ATOMIC);
1420         if (!soft_wc)
1421                 return -ENOMEM;
1422
1423         soft_wc->wc = *wc;
1424         spin_lock_irqsave(&cq->lock, flags);
1425         list_add_tail(&soft_wc->list, &cq->wc_list);
1426         if (cq->notify_flags == IB_CQ_NEXT_COMP ||
1427             wc->status != IB_WC_SUCCESS) {
1428                 cq->notify_flags = 0;
1429                 schedule_work(&cq->notify_work);
1430         }
1431         spin_unlock_irqrestore(&cq->lock, flags);
1432
1433         return 0;
1434 }