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mlx5dv_create_cq(3) mlx5 Programmer's Manual 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>
2018-9-1 mlx5