NAME

       mlx5dv_alloc_var - Allocates a VAR

       mlx5dv_free_var - Frees a VAR

SYNOPSIS

              #include <infiniband/mlx5dv.h>

              struct mlx5dv_var *
              mlx5dv_alloc_var(struct ibv_context *context, uint32_t flags);

              void mlx5dv_free_var(struct mlx5dv_var *dv_var);

DESCRIPTION

       Create / free a VAR which can be used for some device commands over the DEVX interface.

       The DEVX API enables direct access from the user space area to the mlx5 device driver, the
       VAR information is needed for few commands related to Virtio.

ARGUMENTS

       context
              RDMA device context to work on.

       flags  Allocation flags for the UAR.

   dv_var
              struct mlx5dv_var {
                  uint32_t page_id;
                  uint32_t length;
                  off_t mmap_off;
                  uint64_t comp_mask;
              };

       page_id
              The device page id to be used.

       length The mmap length parameter to be used for mapping a VA to the allocated VAR entry.

       mmap_off
              The mmap offset parameter to be used for mapping a VA to the allocated VAR entry.

RETURN VALUE

       Upon success mlx5dv_alloc_var returns a pointer to the created VAR ,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_alloc_var / mlx5dv_free_var(3)