netdev - Re: [PATCH RFCv2] arm64: eBPF JIT compiler

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Message-ID: <CAMEtUuwuQzYknOm4qqYFa2By=zCOpkk4_zp=_2BuPavg-rPc-A@mail.gmail.com>
Date:	Thu, 10 Jul 2014 11:51:08 +0200
From:	Alexei Starovoitov <ast@...mgrid.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>,
	Daniel Borkmann <dborkman@...hat.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 RFCv2] arm64: eBPF JIT compiler

On Wed, Jul 9, 2014 at 3:00 PM, Will Deacon <will.deacon@....com> wrote:
> On Tue, Jul 08, 2014 at 08:06:53AM +0100, Zi Shen Lim wrote:
>>
>> 1. Implement remaining classes of eBPF instructions: ST|MEM, STX|XADD
>>    which currently do not have corresponding test cases in test_bpf.
>
> I can help out with atomics, if you need it. Are the memory barrier
> semantics well-defined for eBPF?

There are no barrier or cmpxchg instructions in eBPF, since such use case
doesn't exist yet. There is only xadd that is equivalent to atomic_add
which can be JITed as exclusive load/store on arm64.
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