John Fastabend 34f79502bb bpf: avoid preempt enable/disable in sockmap using tcp_skb_cb region ... SK_SKB BPF programs are run from the socket/tcp context but early in the stack before much of the TCP metadata is needed in tcp_skb_cb. So we can use some unused fields to place BPF metadata needed for SK_SKB programs when implementing the redirect function. This allows us to drop the preempt disable logic. It does however require an API change so sk_redirect_map() has been updated to additionally provide ctx_ptr to skb. Note, we do however continue to disable/enable preemption around actual BPF program running to account for map updates. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-10-20 13:01:29 +01:00
..
asm-generic	tools include: Sync kernel ABI headers with tooling headers	2017-09-25 10:39:44 -03:00
drm	tools include: Sync kernel ABI headers with tooling headers	2017-09-25 10:39:44 -03:00
linux	bpf: avoid preempt enable/disable in sockmap using tcp_skb_cb region	2017-10-20 13:01:29 +01:00
sound	tools include uapi: Grab a copy of sound/asound.h	2017-08-01 13:02:11 -03:00