linux-kernel - Re: [PATCH v6 net-next 4/6] bpf: enable bpf syscall on x64 and i386

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Message-ID: <CAMEtUuxicvHsEQ59CeG2kmLW0b4TQ9ExfDkKo2kktH-t8x5tBg@mail.gmail.com>
Date:	Mon, 25 Aug 2014 21:24:34 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Chema Gonzalez <chema@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.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 v6 net-next 4/6] bpf: enable bpf syscall on x64 and i386

On Mon, Aug 25, 2014 at 8:52 PM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> Per discussion at Kernel Summit. Every new syscall requires
> a manual page and test programs. We have had too many new syscalls
> that are DOA.

There is verifier testsuite that is testing eBPF verifier from userspace
via bpf syscall. Also there are multiple examples and libbpf.
I think test coverage for bpf syscall is quite substantial already.

As far as manpage I already mentioned my plan in the other thread.
I will do it when stuff lands, since writing docs in english is the most
difficult part of these patches. I already rewrote Documentation/../filter.txt
several times. Even once Kees noticed discrepancies there when
interface changed from map_id to map_fd.
To do a manpage I'll use a help from tech writer, since I want it to
be better than docs I put in Documentation/...
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