linux-kernel - Re: [PATCH v2 net-next 0/2] split BPF out of core networking

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Date:	Tue, 3 Jun 2014 20:16:46 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jonathan Corbet <corbet@....net>,
	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	Chema Gonzalez <chema@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 net-next 0/2] split BPF out of core networking


* Alexei Starovoitov <ast@...mgrid.com> wrote:

> On Mon, Jun 2, 2014 at 7:16 AM, Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> > Em Mon, Jun 02, 2014 at 09:24:56AM -0400, Steven Rostedt escreveu:
> >> On Mon, 2 Jun 2014 08:15:45 -0500
> >> Jonathan Corbet <corbet@....net> wrote:
> >
> >> > On Mon,  2 Jun 2014 00:01:44 -0700
> >> > Alexei Starovoitov <ast@...mgrid.com> wrote:
> >
> >> > > This patch set splits BPF out of core networking into generic component
> >
> >> > Quick, probably dumb question: if you're going to split it out, why not
> >> > split it out entirely, into kernel/ or (perhaps better) lib/?  The
> >> > whole point seems to be that BPF is outgrowing its networking home, so
> >> > it seems like it might be better to make it truly generic.
> >
> >> I believe this is what Ingo suggested as well. If it is become generic,
> >> it belongs in lib/
> >
> > Yes, that was his suggestion, which I agree with, FWIW.
> 
> I guess I posted v2 too quickly :) v2 splits filter.c into 
> kernel/bpf/. I think it's a better location than lib/bpf, since lib 
> feels too constrained by definition of 'library'. bpf is more than a 
> set of library calls.

Yeah, the upgrade to kernel/bpf/ is a better place for BPF IMO: BPF is 
really an 'active', stateful subsystem, with non-trivial per arch 
implementations, while lib/ is generally for standalone, generic, 
platform-decoupled library functions (with a few exceptions).

Thanks,

	Ingo
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