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docs: netlink: add NLMSG_DONE message format for doit actions 

In case NLMSG_DONE message is sent as a reply to doit action, multiple
kernel implementation do not send anything else than struct nlmsghdr.
Add this note to the Netlink intro documentation.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Link: https://lore.kernel.org/r/20231201180154.864007-1-jiri@resnulli.us
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jiri Pirko 2023-12-01 19:01:54 +01:00 committed by Jakub Kicinski
parent 21f4968165
commit 8ad55b1e73
1 changed files with 4 additions and 0 deletions
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4
Documentation/userspace-api/netlink/intro.rst
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@ -234,6 +234,10 @@ ACK attributes may be present::
| ** optionally extended ACK |
----------------------------------------------
Note that some implementations may issue custom ``NLMSG_DONE`` messages
in reply to ``do`` action requests. In that case the payload is
implementation-specific and may also be absent.
.. _res_fam:
Resolving the Family ID