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| author | Donald Hunter <donald.hunter@gmail.com> | 2023-03-27 09:31:38 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-03-28 23:54:43 -0700 |
| commit | 04eac39361d3506c82ccf932cb288e84d5746969 (patch) | |
| tree | e68822bea6118a746cd656ea058680a4a03ec472 /Documentation/userspace-api | |
| parent | 88e288968412ec1ca3d3b2d96956baa543fdfe82 (diff) | |
| download | linux-04eac39361d3506c82ccf932cb288e84d5746969.tar.gz | |
docs: netlink: document the sub-type attribute property
Add a definition for sub-type to the protocol spec doc and a description of
its usage for C arrays in genetlink-legacy.
Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation/userspace-api')
| -rw-r--r-- | Documentation/userspace-api/netlink/genetlink-legacy.rst | 14 | ||||
| -rw-r--r-- | Documentation/userspace-api/netlink/specs.rst | 10 |
2 files changed, 24 insertions, 0 deletions
diff --git a/Documentation/userspace-api/netlink/genetlink-legacy.rst b/Documentation/userspace-api/netlink/genetlink-legacy.rst index b8fdcf7f6615..802875a37a27 100644 --- a/Documentation/userspace-api/netlink/genetlink-legacy.rst +++ b/Documentation/userspace-api/netlink/genetlink-legacy.rst @@ -234,6 +234,20 @@ specify a sub-type. type: binary struct: vport-stats +C Arrays +-------- + +Legacy families also use ``binary`` attributes to encapsulate C arrays. The +``sub-type`` is used to identify the type of scalar to extract. + +.. code-block:: yaml + + attributes: + - + name: ports + type: binary + sub-type: u32 + Multi-message DO ---------------- diff --git a/Documentation/userspace-api/netlink/specs.rst b/Documentation/userspace-api/netlink/specs.rst index a22442ba1d30..2e4acde890b7 100644 --- a/Documentation/userspace-api/netlink/specs.rst +++ b/Documentation/userspace-api/netlink/specs.rst @@ -254,6 +254,16 @@ rather than depend on what is specified in the spec file. The validation policy in the kernel is formed by combining the type definition (``type`` and ``nested-attributes``) and the ``checks``. +sub-type +~~~~~~~~ + +Legacy families have special ways of expressing arrays. ``sub-type`` can be +used to define the type of array members in case array members are not +fully defined as attributes (in a bona fide attribute space). For instance +a C array of u32 values can be specified with ``type: binary`` and +``sub-type: u32``. Binary types and legacy array formats are described in +more detail in :doc:`genetlink-legacy`. + operations ---------- |