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mlx5dv_devx_alloc_uar(3) — Linux manual page

mlx5dv_devx_all...v_devx_free_uar(3)mlx5dv_devx_all...v_devx_free_uar(3)

NAME        top

       mlx5dv_devx_alloc_uar - Allocates a DEVX UAR       mlx5dv_devx_free_uar - Frees a DEVX UAR

SYNOPSIS        top

              #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        top

       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        top

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.

RETURN VALUE        top

       Upon successmlx5dv_devx_alloc_uar will return a newstructmlx5dv_devx_uar, on error NULL will be returned and errno will be       set.

SEE ALSO        top

mlx5dv_open_device,mlx5dv_devx_obj_create       #AUTHOR       Yishai Hadas ⟨yishaih@mellanox.com⟩

COLOPHON        top

       This page is part of therdma-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 isnot part of the original manual page), send a mail to       man-pages@man7.orgmlx5dv_devx_all...v_devx_free_uar(3)

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