Merge branch 'net-dsa-loop-Preparatory-changes-for-802-1Q-data-path'

net: dsa: loop: Preparatory changes for 802.1Q data path
Florian Fainelli says:

====================
These patches are all meant to help pave the way for a 802.1Q data path
added to the mockup driver, making it more useful than just testing for
configuration. Sending those out now since there is no real need to
wait.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>