netdev - Re: [PATCH iproute2 master 1/2] bpf: improve error reporting around tail calls

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Date:   Sat, 22 Jul 2017 10:06:37 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Stephen Hemminger <stephen@...workplumber.org>
CC:     ast@...com, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 master 1/2] bpf: improve error reporting around
 tail calls

On 07/22/2017 01:28 AM, Stephen Hemminger wrote:
> On Fri, 21 Jul 2017 21:13:06 +0200
> Daniel Borkmann <daniel@...earbox.net> wrote:
>
>> Currently, it's still quite hard to figure out if a prog passed the
>> verifier, but later gets rejected due to different tail call ownership.
>> Figure out whether that is the case and provide appropriate error
>> messages to the user.
>>
>> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
>
> Sorry, dead code. Please fix and resubmit.
>
> bpf.c:356:12: warning: ‘bpf_derive_prog_from_fdinfo’ defined but not used [-Wunused-function]
>   static int bpf_derive_prog_from_fdinfo(int fd, struct bpf_prog_data *prog)

Yeah, v2 coming later today. I didn't compile with !HAVE_ELF,
where it's not in use indeed. Thanks!