netdev - Re: [bpf-next PATCH 3/3] samples/bpf: xdp_fwd explain bpf_fib

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Message-ID: <CAH3MdRV+LUuKpbUJFzqFrodEDbfm5aif+qmzWsUJYSFGQyCMow@mail.gmail.com>
Date:   Wed, 7 Aug 2019 11:05:33 -0700
From:   Y Song <ys114321@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Xdp <xdp-newbies@...r.kernel.org>, a.s.protopopov@...il.com,
        David Ahern <dsahern@...il.com>
Subject: Re: [bpf-next PATCH 3/3] samples/bpf: xdp_fwd explain bpf_fib_lookup
 return codes

On Wed, Aug 7, 2019 at 5:38 AM Jesper Dangaard Brouer <brouer@...hat.com> wrote:
>
> 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@...il.com>
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>

Acked-by: Yonghong Song <yhs@...com>