drivers/common/mlx5/linux/mlx5_common_verbs.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2020 Mellanox Technologies, Ltd
   3  */
   4
   5 #include <stddef.h>
   6 #include <errno.h>
   7 #include <string.h>
   8 #include <stdint.h>
   9 #include <unistd.h>
  10 #include <sys/mman.h>
  11 #include <inttypes.h>
  12
  13 #include "mlx5_autoconf.h"
  14 #include <mlx5_glue.h>
  15 #include <mlx5_common.h>
  16 #include <mlx5_common_mr.h>
  17
  18 /**
  19  * Register mr. Given protection domain pointer, pointer to addr and length
  20  * register the memory region.
  21  *
  22  * @param[in] pd
  23  *   Pointer to protection domain context.
  24  * @param[in] addr
  25  *   Pointer to memory start address.
  26  * @param[in] length
  27  *   Length of the memory to register.
  28  * @param[out] pmd_mr
  29  *   pmd_mr struct set with lkey, address, length and pointer to mr object
  30  *
  31  * @return
  32  *   0 on successful registration, -1 otherwise
  33  */
  34 int
  35 mlx5_common_verbs_reg_mr(void *pd, void *addr, size_t length,
  36                          struct mlx5_pmd_mr *pmd_mr)
  37 {
  38         struct ibv_mr *ibv_mr;
  39
  40         memset(pmd_mr, 0, sizeof(*pmd_mr));
  41         ibv_mr = mlx5_glue->reg_mr(pd, addr, length,
  42                                    IBV_ACCESS_LOCAL_WRITE |
  43                                    (haswell_broadwell_cpu ? 0 :
  44                                    IBV_ACCESS_RELAXED_ORDERING));
  45         if (!ibv_mr)
  46                 return -1;
  47
  48         *pmd_mr = (struct mlx5_pmd_mr){
  49                 .lkey = ibv_mr->lkey,
  50                 .addr = ibv_mr->addr,
  51                 .len = ibv_mr->length,
  52                 .obj = (void *)ibv_mr,
  53         };
  54         return 0;
  55 }
  56
  57 /**
  58  * Deregister mr. Given the mlx5 pmd MR - deregister the MR
  59  *
  60  * @param[in] pmd_mr
  61  *   pmd_mr struct set with lkey, address, length and pointer to mr object
  62  *
  63  */
  64 void
  65 mlx5_common_verbs_dereg_mr(struct mlx5_pmd_mr *pmd_mr)
  66 {
  67         if (pmd_mr && pmd_mr->obj != NULL) {
  68                 claim_zero(mlx5_glue->dereg_mr(pmd_mr->obj));
  69                 memset(pmd_mr, 0, sizeof(*pmd_mr));
  70         }
  71 }
  72