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

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Date:	Tue, 3 Jun 2014 13:58:21 -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>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chema Gonzalez <chema@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	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

On Tue, Jun 3, 2014 at 1:35 PM, Daniel Borkmann <dborkman@...hat.com> wrote:
> On 06/03/2014 05:44 PM, Alexei Starovoitov wrote:
> ...
>>
>> All of your points are valid. They are right questions to ask. I just
>>
>> don't see why you're still arguing about first step of filter.c split,
>> whereas your concerns are about steps 2, 3, 4.
>
>
> Fair enough, lets keep them in mind though for future work. Btw,

Ok :)

> are other files planned for kernel/bpf/ or should it instead just
> simply be kernel/bpf.c?

The most obvious one is eBPF verifier in separate file (kernel/bpf/verifier.c)
bpf maps is yet another thing, but that's different topic.
Probably a set of bpf-callable functions in another file. Like right now
for sockets these helpers are __skb_get_pay_offset(), __skb_get_nlattr()
For tracing there will be a different set of helper functions and eventually
some will be common. Like __get_raw_cpu_id() from filter.c could
eventually move to kernel/bpf/helpers.c
I'm not a fan of squeezing different logic into one file.
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