netdev - [patch net-next v2] docs: netlink: add NLMSG_DONE message format for doit actions

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Date: Fri,  1 Dec 2023 16:34:09 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org,
	pabeni@...hat.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	corbet@....net
Subject: [patch net-next v2] docs: netlink: add NLMSG_DONE message format for doit actions

From: Jiri Pirko <jiri@...dia.com>

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@...dia.com>
---
v1->v2:
- Changed the note completely
---
 Documentation/userspace-api/netlink/intro.rst | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/userspace-api/netlink/intro.rst b/Documentation/userspace-api/netlink/intro.rst
index 7b1d401210ef..e0efa75db94b 100644
--- a/Documentation/userspace-api/netlink/intro.rst
+++ b/Documentation/userspace-api/netlink/intro.rst
@@ -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 avoided.
+
 .. _res_fam:
 
 Resolving the Family ID
-- 
2.41.0