bpf: move event_output to const_size_or_zero for xdp/skb as well
authorDaniel Borkmann <daniel@iogearbox.net>
Sat, 20 Jan 2018 00:24:37 +0000 (01:24 +0100)
committerAlexei Starovoitov <ast@kernel.org>
Sat, 20 Jan 2018 02:37:00 +0000 (18:37 -0800)
commit1728a4f2ad6840746a6b1b9f01d652c5842f7e8d
treef94d94db60f1bd595fc080694f8660566eeaf28b
parent4bd95f4b99e921f51783bfddcd9738e9d3eef2b5
bpf: move event_output to const_size_or_zero for xdp/skb as well

Similar rationale as in a60dd35d2e39 ("bpf: change bpf_perf_event_output
arg5 type to ARG_CONST_SIZE_OR_ZERO"), change the type to CONST_SIZE_OR_ZERO
such that we can better deal with optimized code. No changes needed in
bpf_event_output() as it can also deal with 0 size entirely (e.g. as only
wake-up signal with empty frame in perf RB, or packet dumps w/o meta data
as another such possibility).

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
net/core/filter.c