Merge branch 'bpf-metadata-direct-access'

Daniel Borkmann says:

====================
BPF metadata for direct access

This work enables generic transfer of metadata from XDP into skb,
meaning the packet has a flexible and programmable room for meta
data, which can later be used by BPF to set various skb members
when passing up the stack. For details, please see second patch.
Support has been implemented and tested with two drivers, and
should be straight forward to add to other drivers as well which
properly support head adjustment already.
====================

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