mlx5dv_create_cq(3)

NAME
mlx5dv_create_cq - creates a completion queue (CQ)

SYNOPSIS

        #include <infiniband/mlx5dv.h>

        struct ibv_cq_ex *mlx5dv_create_cq(struct ibv_context *context,
                           struct ibv_cq_init_attr_ex *cq_attr,
                           struct mlx5dv_cq_init_attr *mlx5_cq_attr);

DESCRIPTION
mlx5dv_create_cq() creates a completion queue (CQ) with specific driver properties.

ARGUMENTS
Please see ibv_create_cq_ex(3) man page for context and cq_attr

  mlx5_cq_attr

        struct mlx5dv_cq_init_attr {
            uint64_t comp_mask;
            uint8_t  cqe_comp_res_format;
            uint32_t flags;
            uint16_t cqe_size;
        };

comp_mask
    Bitmask specifying what fields in the structure are valid:

    MLX5DV_CQ_INIT_ATTR_MASK_COMPRESSED_CQE enables creating a CQ in a mode that few CQEs may be compressed into a single CQE, valid values in cqe_comp_res_format

    MLX5DV_CQ_INIT_ATTR_MASK_FLAGS valid values in flags

    MLX5DV_CQ_INIT_ATTR_MASK_CQE_SIZE valid values in cqe_size

cqe_comp_res_format
    A bitwise OR of the various CQE response formats of the responder side:

    MLX5DV_CQE_RES_FORMAT_HASH CQE compression with hash

    MLX5DV_CQE_RES_FORMAT_CSUM CQE compression with RX checksum

    MLX5DV_CQE_RES_FORMAT_CSUM_STRIDX CQE compression with stride index

flags
    A bitwise OR of the various values described below:

    MLX5DV_CQ_INIT_ATTR_FLAGS_CQE_PAD create a padded 128B CQE

cqe_size
    configure the CQE size to be 64 or 128 bytes other values will fail mlx5dv_create_cq.

RETURN VALUE
mlx5dv_create_cq() returns a pointer to the created CQ, or NULL if the request fails and errno will be set.

SEE ALSO
ibv_create_cq_ex(3),

AUTHOR
Yonatan Cohen yonatanc@mellanox.com