mlx5dv_var_export - Man Page

mlx5dv_var_export — Export VAR attributes for cross-process sharing

mlx5dv_var_import — Import a VAR from exported attributes

mlx5dv_var_unimport — Unimport a VAR

#include <infiniband/mlx5dv.h>

int mlx5dv_var_export(struct mlx5dv_var *dv_var, void *data);

struct mlx5dv_var *mlx5dv_var_import(struct ibv_context *context,
                                     void *data);

void mlx5dv_var_unimport(struct mlx5dv_var *dv_var);

These functions enable cross-process sharing of VAR objects.

mlx5dv_var_export() exports a VAR attributes into a data buffer. The buffer must be allocated by the caller with at least the size returned by mlx5dv_get_export_sizes() in the var_attrs_size field.

mlx5dv_var_import() returns a VAR that is associated with the exported attributes in the given context.

The context can be the original VAR allocating context or any context sharing the same kernel resources (e.g., via ibv_import_device()).

mlx5dv_var_unimport() unimports a VAR that was imported via mlx5dv_var_import(). Once the VAR usage has ended, either mlx5dv_free_var() or mlx5dv_var_unimport() should be called. mlx5dv_free_var() destroys the kernel object, while mlx5dv_var_unimport() only cleans up local resources without affecting the kernel object.

It is the responsibility of the application to coordinate between all contexts that use this VAR. Once destroy/free is done, no other process can use the object except for unimport. All users must collaborate to ensure this.

mlx5dv_var_export() returns 0 on success, or the value of errno on error.

mlx5dv_var_import() returns a pointer to a struct mlx5dv_var on success, or NULL on error with errno set.

mlx5dv_alloc_var, mlx5dv_get_export_sizes, mlx5dv_open_device

Maher Sanalla msanalla@nvidia.com\c

mlx5dv_get_export_sizes(3).

The man pages mlx5dv_var_import(3) and mlx5dv_var_unimport(3) are aliases of mlx5dv_var_export(3).