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doc/netlink: Describe sub-message selector resolution

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Update the netlink-raw docs to add a description of sub-message selector
resolution to explain that selector resolution is constrained by the
spec.

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240129223458.52046-4-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Donald Hunter
2024-01-29 22:34:48 +00:00
committed by Jakub Kicinski
parent bf8b832374
commit 78d2341697
1 changed files with 8 additions and 0 deletions
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Documentation/userspace-api/netlink/netlink-raw.rst
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@@ -150,3 +150,11 @@ attributes from an ``attribute-set``. For example the following
Note that a selector attribute must appear in a netlink message before any
sub-message attributes that depend on it.
If an attribute such as ``kind`` is defined at more than one nest level, then a
sub-message selector will be resolved using the value 'closest' to the selector.
For example, if the same attribute name is defined in a nested ``attribute-set``
alongside a sub-message selector and also in a top level ``attribute-set``, then
the selector will be resolved using the value 'closest' to the selector. If the
value is not present in the message at the same level as defined in the spec
then this is an error.