Merge branch 'ethtool-rss-support-creating-and-removing-contexts-via-netlink'

Merge branch 'ethtool-rss-support-creating-and-removing-contexts-via-netlink'

Jakub Kicinski says:

====================
ethtool: rss: support creating and removing contexts via Netlink

This series completes support of RSS configuration via Netlink.
All functionality supported by the IOCTL is now supported by
Netlink. Future series (time allowing) will add:
 - hashing on the flow label, which started this whole thing;
 - pinning the RSS context to a Netlink socket for auto-cleanup.

The first patch is a leftover held back from previous series
to avoid conflicting with Gal's fix.

Next 4 patches refactor existing code to make reusing it for
context creation possible. 2 patches after that add create
and delete commands. Last but not least the test is extended.
====================

Link: https://patch.msgid.link/20250717234343.2328602-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>