mlx5dv_devx_alloc_uar / mlx5dv_mlx5dvrdevxaalloc_uar / mlx5dv_devx_free_uar(3)
NAME
mlx5dv_devx_alloc_uar - Allocates a DEVX UAR
mlx5dv_devx_free_uar - Frees a DEVX UAR
SYNOPSIS
#include <infiniband/mlx5dv.h>
struct mlx5dv_devx_uar *mlx5dv_devx_alloc_uar(struct ibv_context *context,
uint32_t flags);
void mlx5dv_devx_free_uar(struct mlx5dv_devx_uar *devx_uar);
DESCRIPTION
Create / free a DEVX UAR which is needed for other device commands over
the DEVX interface.
The DEVX API enables direct access from the user space area to the mlx5
device driver, the UAR information is needed for few commands as of QP
creation.
ARGUMENTS
context
RDMA device context to work on.
flags Allocation flags for the UAR. MLX5DV_UAR_ALLOC_TYPE_BF: Allo-
cate UAR with Blueflame properties. MLX5DV_UAR_ALLOC_TYPE_NC:
Allocate UAR with non-cache properties.
devx_uar
struct mlx5dv_devx_uar {
void *reg_addr;
void *base_addr;
uint32_t page_id;
off_t mmap_off;
uint64_t comp_mask;
};
reg_addr
The write address of DB/BF.
base_addr
The base address of the UAR.
page_id
The device page id to be used.
mmap_off
The mmap offset parameter to be used for re-mapping, to be used
by a secondary process.
RETURN VALUE
Upon success mlx5dv_devx_alloc_uar will return a new struct mlx5dv_de-
vx_uar, on error NULL will be returned and errno will be set.
SEE ALSO
mlx5dv_open_device, mlx5dv_devx_obj_create
#AUTHOR
Yishai Hadas <yishaih@mellanox.com>
mlx5dv_devx_alloc_uar / mlx5dv_devx_free_uar(3)
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