Merge branch 'bpf'

Daniel Borkmann says:

====================
bpf/filter updates

This set adds just two minimal helper tools that complement the
already available bpf_jit_disasm and complete BPF tooling; plus
it adds and an extensive documentation update of filter.txt.

Please see individual descriptions for details.
====================

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