Merge branch 'flow_dissector-improvements'

Jiri Pirko says:

====================
flow dissector improvements

This patchset follows-up the discussion about future extensions of flow
dissector and tries to address the mentioned concerns. Some parts are
cut out into sub-functions. Also, the processing of the code (ARP, MPLS)
is made dependent on user actually requiring the bisected values.
This prepares the code for future extensions to bisect IPv6 ND messages,
TCP flags, etc.
====================

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