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mlx5dv_devx_alloc_msi_vector(3) mlx5 Programmer’s Manual mlx5dv_devx_alloc_msi_vector(3)

NAME

mlx5dv_devx_alloc_msi_vector - Allocate an msi vector to be used for creating an EQ.

mlx5dv_devx_free_msi_vector - Release an msi vector.

SYNOPSIS

#include <infiniband/mlx5dv.h>
struct mlx5dv_devx_msi_vector *
mlx5dv_devx_alloc_msi_vector(struct ibv_context *ibctx);
int mlx5dv_devx_free_msi_vector(struct mlx5dv_devx_msi_vector *msi);

DESCRIPTION

Allocate or free an msi vector to be used for creating an EQ.

The allocate API exposes a mlx5dv_devx_msi_vector object, which includes an msi vector and a fd. The vector can be used as the “eqc.intr” field when creating an EQ, while the fd (created as non-blocking) can be polled to see once there is some data on that EQ.

ARGUMENTS

RDMA device context to create the action on.
The msi vector object to work on.

msi_vector

struct mlx5dv_devx_msi_vector {


    int vector;


    int fd;
};
The vector to be used when creating the EQ over the device specification.
The FD that will be used for polling.

RETURN VALUE

Upon success mlx5dv_devx_alloc_msi_vector will return a new struct mlx5dv_devx_msi_vector; On error NULL will be returned and errno will be set.

Upon success mlx5dv_devx_free_msi_vector will return 0, on error errno will be returned.

AUTHOR

Mark Zhang <markzhang@nvidia.com>

2022-01-12 mlx5