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NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | RETURN VALUE | SEE ALSO | AUTHOR | COLOPHON |
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mlx5dv_v..._unimport(3) Library Functions Manual mlx5dv_v..._unimport(3)
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
dv_var The VAR object to export.
data Pointer to a buffer to be filled with the exported
attributes. The buffer must be at least var_attrs_size
bytes as returned by mlx5dv_get_export_sizes().
mlx5dv_var_import
context
RDMA device context to import the VAR into.
data Pointer to a buffer previously filled by
mlx5dv_var_export().
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⟩
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 2026-05-24. (At
that time, the date of the most recent commit that was found in
the repository was 2026-05-20.) 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_v..._unimport(3)
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HTML rendering created 2026-05-24 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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