mlx5dv_reg_dmabuf_mr - Man Page
Register a dma-buf based memory region (MR)
Synopsis
#include <infiniband/mlx5dv.h>
struct ibv_mr *mlx5dv_reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset,
size_t length, uint64_t iova, int fd,
int access, int mlx5_access)Description
Register a dma-buf based memory region (MR), it follows the functionality of ibv_reg_dmabuf_mr() with the ability to supply specific mlx5 access flags.
Arguments
- pd
The associated protection domain.
- offset
The offset of the dma-buf where the MR starts.
- length
The length of the MR.
- iova
Specifies the virtual base address of the MR when accessed through a lkey or rkey. It must have the same page offset as offset and be aligned with the system page size.
- fd
The file descriptor that the dma-buf is identified by.
- access
The desired memory protection attributes; it is either 0 or the bitwise OR of one or more of enum ibv_access_flags.
- mlx5_access
A specific device access flags, it is either 0 or the below.
MLX5DV_REG_DMABUF_ACCESS_DATA_DIRECT if set, this MR will be accessed through the Data Direct engine bonded with that RDMA device.
Return Value
Upon success returns a pointer to the registered MR, or NULL if the request fails, in that case the value of errno indicates the failure reason.
See Also
ibv_reg_dmabuf_mr(3), mlx5dv_get_data_direct_sysfs_path(3)
Author
Yishai Hadas yishaih@nvidia.com\c