Merge branch 'bpf_event_output'

Daniel Borkmann says:

====================
BPF updates

This minor set adds a new helper bpf_event_output() for eBPF cls/act
program types which allows to pass events to user space applications.
For details, please see individual patches.

v1 -> v2:
  - Address kbuild bot found compile issue in patch 2
  - Rest as is
====================

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