netdev - Re: [PATCH iproute2 -master 2/4] tc, bpf: improve verifier logging

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Date:	Tue, 2 Feb 2016 16:02:12 +1100
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Daniel Borkmann <daniel@...earbox.net>
Cc:	ast@...nel.org, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 -master 2/4] tc, bpf: improve verifier logging

On Tue,  2 Feb 2016 01:12:27 +0100
Daniel Borkmann <daniel@...earbox.net> wrote:

> With a bit larger, branchy eBPF programs f.e. already ~BPF_MAXINSNS/7 in
> size, it happens rather quickly that bpf(2) rejects also valid programs
> when only the verifier log buffer size we have in tc is too small.
> 
> Change that, so by default we don't do any logging, and only in error
> case we retry with logging enabled. If we should fail providing a
> reasonable dump of the verifier analysis, retry few times with a larger
> log buffer so that we can at least give the user a chance to debug the
> program.
> 
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> ---

Does not apply

Applying: tc, bpf: improve verifier logging
error: patch failed: tc/tc_bpf.c:762
error: tc/tc_bpf.c: patch does not apply
Patch failed at 0002 tc, bpf: improve verifier logging