netdev - Re: [PATCH v11 net-next 12/12] bpf: mini eBPF library, test stubs and verifier testsuite

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Message-ID: <CAMEtUuzaCEX9RKDBMnQBZSHdTjjidp81myfSVVi4qQqtSGgtmw@mail.gmail.com>
Date:	Wed, 17 Sep 2014 09:17:41 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Chema Gonzalez <chema@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...uxfoundation.org>,
	Kees Cook <keescook@...omium.org>,
	Linux API <linux-api@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v11 net-next 12/12] bpf: mini eBPF library, test stubs and
 verifier testsuite

On Wed, Sep 17, 2014 at 12:16 AM, Daniel Borkmann <dborkman@...hat.com> wrote:
>
>
> That actually still doesn't answer my question why the test stub
> cannot live in lib/test_bpf where we have our actual testing
> framework for eBPF/BPF, also since you exactly only build test_stub.c
> when TEST_BPF is enabled which is the Kconfig for lib/test_bpf.

multiple reasons:
1.
lib/test_bpf.c is a module, whereas test_stub.c is kernel builtin.

2.
I wasn't sure that reusing CONFIG_TEST_BPF for this
purpose was a good idea. May be it's better to introduce
CONFIG_BPF_VERIFIER_TEST_STUBS or something.

3.
kernel/bpf/test_stubs.c can be removed once real tracing
or socket use case is in.
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