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NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | RETURN VALUE | SEE ALSO | COLOPHON |
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mlx5dv_devx_all...v_devx_free_uar(3) mlx5dv_devx_all...v_devx_free_uar(3)
mlx5dv_devx_alloc_uar - Allocates a DEVX UAR
mlx5dv_devx_free_uar - Frees a DEVX UAR
#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);
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.
context
RDMA device context to work on.
flags Allocation flags for the UAR. MLX5DV_UAR_ALLOC_TYPE_BF:
Allocate UAR with Blueflame properties.
MLX5DV_UAR_ALLOC_TYPE_NC: Allocate UAR with non-cache
properties. MLX5DV_UAR_ALLOC_TYPE_NC_DEDICATED: Allocate a
dedicated 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.
Upon success mlx5dv_devx_alloc_uar will return a new struct
mlx5dv_devx_uar, on error NULL will be returned and errno will be
set.
mlx5dv_open_device, mlx5dv_devx_obj_create
#AUTHOR
Yishai Hadas ⟨yishaih@mellanox.com⟩
This page is part of the rdma-core (RDMA Core Userspace Libraries
and Daemons) project. Information about the project can be found
at ⟨https://github.com/linux-rdma/rdma-core⟩. If you have a bug
report for this manual page, send it to
linux-rdma@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2025-08-11. (At
that time, the date of the most recent commit that was found in
the repository was 2025-08-04.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
mlx5dv_devx_all...v_devx_free_uar(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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