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authorJesper Dangaard Brouer <brouer@redhat.com>2019-08-08 19:17:47 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2019-08-09 19:05:03 +0300
commitabcce733adb71013997fcb84142a5454ef133616 (patch)
tree28659aea47a6a2c3135b3f97a4ecb3dae929f2d1 /arch/ia64
parenta32a32cb26eb6291125e4eb49b569874ca9a53b5 (diff)
downloadlinux-abcce733adb71013997fcb84142a5454ef133616.tar.xz
samples/bpf: xdp_fwd explain bpf_fib_lookup return codes
Make it clear that this XDP program depend on the network stack to do the ARP resolution. This is connected with the BPF_FIB_LKUP_RET_NO_NEIGH return code from bpf_fib_lookup(). Another common mistake (seen via XDP-tutorial) is that users don't realize that sysctl net.ipv{4,6}.conf.all.forwarding setting is honored by bpf_fib_lookup. Reported-by: Anton Protopopov <a.s.protopopov@gmail.com> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Reviewed-by: David Ahern <dsahern@gmail.com> Acked-by: Yonghong Song <yhs@fb.com> Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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