table of contents
| 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¶
AUTHOR¶
Yonatan Cohen <yonatanc@mellanox.com>
| 2018-9-1 | mlx5 |