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

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Message-ID: <20170721162825.0b42e9ba@xeon-e3>
Date:   Fri, 21 Jul 2017 16:28:25 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     ast@...com, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 master 1/2] bpf: improve error reporting around
 tail calls

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)