netdev - Re: [PATCH bpf-next] bpf: better availability probing for seg6 helpers

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Message-ID: <5da76612-54b4-d616-6def-a103cafee074@iogearbox.net>
Date:   Tue, 10 Jul 2018 21:20:33 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Mathieu Xhonneux <m.xhonneux@...il.com>, netdev@...r.kernel.org
Cc:     alexei.starovoitov@...il.com
Subject: Re: [PATCH bpf-next] bpf: better availability probing for seg6
 helpers

On 07/10/2018 06:54 PM, Mathieu Xhonneux wrote:
> bpf_lwt_seg6_* helpers require CONFIG_IPV6_SEG6_BPF, and currently
> return -EOPNOTSUPP to indicate unavailability. This patch forces the
> BPF verifier to reject programs using these helpers when
> !CONFIG_IPV6_SEG6_BPF, allowing users to more easily probe if they are
> available or not.
> 
> Signed-off-by: Mathieu Xhonneux <m.xhonneux@...il.com>

Note, just fyi, this would need to go to bpf tree (and not bpf-next) as
otherwise there's a change in behavior.

Thanks,
Daniel