netdev - Re: [PATCH RFC] arm64: eBPF JIT compiler

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Date:	Thu, 03 Jul 2014 11:23:14 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Will Deacon <will.deacon@....com>
CC:	Zi Shen Lim <zlim.lnx@...il.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Chema Gonzalez <chema@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH RFC] arm64: eBPF JIT compiler

On 07/03/2014 11:14 AM, Will Deacon wrote:
> On Wed, Jul 02, 2014 at 06:20:24AM +0100, Zi Shen Lim wrote:
>> The JIT compiler emits A64 instructions. It supports eBPF only.
>> Legacy BPF is supported thanks to conversion by BPF core.
>>
>> JIT is enabled in the same way as for other architectures:
>>
>>          echo 1 > /proc/sys/net/core/bpf_jit_enable
>>
>> Or for additional compiler output:
>>
>>          echo 2 > /proc/sys/net/core/bpf_jit_enable
>>
>> See Documentation/networking/filter.txt for more information.
>>
>> The implementation passes all 57 tests in lib/test_bpf.c
>> on ARMv8 Foundation Model :)
>
> First off, this is really cool. Thanks for putting in the effort to get this
> supported on arm64! I'm happy to run tests on some real hardware if you tell
> me how to run them :)

We have lib/test_bpf.c for this, see also Documentation/networking/filter.txt.

So, the procedure would be, e.g.:

  1) echo 1 > /proc/sys/net/core/bpf_jit_enable
  2) modprobe/insmod test_bpf
  3) See kernel log for passes/fails

For seccomp/BPF, there's a test suite in:

  https://github.com/redpig/seccomp
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