netdev - Re: [PATCH v3] net: filter: BPF 'JIT' compiler for PPC64

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Message-Id: <20110721.124757.1998243180954846915.davem@davemloft.net>
Date:	Thu, 21 Jul 2011 12:47:57 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	matt@...abs.org
Cc:	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3] net: filter: BPF 'JIT' compiler for PPC64

From: Matt Evans <matt@...abs.org>
Date: Thu, 21 Jul 2011 11:51:00 +1000

> An implementation of a code generator for BPF programs to speed up packet
> filtering on PPC64, inspired by Eric Dumazet's x86-64 version.
> 
> Filter code is generated as an ABI-compliant function in module_alloc()'d mem
> with stackframe & prologue/epilogue generated if required (simple filters don't
> need anything more than an li/blr).  The filter's local variables, M[], live in
> registers.  Supports all BPF opcodes, although "complicated" loads from negative
> packet offsets (e.g. SKF_LL_OFF) are not yet supported.
> 
> There are a couple of further optimisations left for future work; many-pass
> assembly with branch-reach reduction and a register allocator to push M[]
> variables into volatile registers would improve the code quality further.
> 
> This currently supports big-endian 64-bit PowerPC only (but is fairly simple
> to port to PPC32 or LE!).
> 
> Enabled in the same way as x86-64:
> 
> 	echo 1 > /proc/sys/net/core/bpf_jit_enable
> 
> Or, enabled with extra debug output:
> 
> 	echo 2 > /proc/sys/net/core/bpf_jit_enable
> 
> Signed-off-by: Matt Evans <matt@...abs.org>

Applied.
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