Merge branch 'mptcp-advertisement-reliability-improvement-and-misc-updates'

Merge branch 'mptcp-advertisement-reliability-improvement-and-misc-updates'

Mat Martineau says:

====================
mptcp: Advertisement reliability improvement and misc. updates

Patch 1 adds a helpful debug tracepoint for outgoing MPTCP packets.

Patch 2 is a small "magic number" refactor.

Patches 3 & 4 refactor parts of the mptcp_join.sh selftest. No change in
test coverage.

Patch 5 ensures only advertised address IDs are un-advertised.

Patches 6-8 improve handling of an edge case where endpoint IDs need to
be created on-the-fly when adding subflows. Includes selftest coverage.

Patch 9 adds validation of the fullmesh flag in a MPTCP netlink command,
which was overlooked when this flag was introduced for 5.18.
====================

Link: https://lore.kernel.org/r/20220307204439.65164-1-mathew.j.martineau@linux.intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>