netdev - Re: [PATCH net-next V2] ARM: net: support BPF_ALU | BPF

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Message-Id: <20151005.070314.997252169637059167.davem@davemloft.net>
Date:	Mon, 05 Oct 2015 07:03:14 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	nschichan@...ebox.fr
Cc:	linux@....linux.org.uk, mgherzan@...il.com, daniel@...earbox.net,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next V2] ARM: net: support BPF_ALU | BPF_MOD
 instructions in the BPF JIT.

From: Nicolas Schichan <nschichan@...ebox.fr>
Date: Fri,  2 Oct 2015 17:06:47 +0200

> For ARMv7 with UDIV instruction support, generate an UDIV instruction
> followed by an MLS instruction.
> 
> For other ARM variants, generate code calling a C wrapper similar to
> the jit_udiv() function used for BPF_ALU | BPF_DIV instructions.
> 
> Some performance numbers reported by the test_bpf module (the duration
> per filter run is reported in nanoseconds, between "jitted:<x>" and
> "PASS":
> 
> ARMv7 QEMU nojit:	test_bpf: #3 DIV_MOD_KX jited:0 2196 PASS
> ARMv7 QEMU jit:		test_bpf: #3 DIV_MOD_KX jited:1 104 PASS
> ARMv5 QEMU nojit:	test_bpf: #3 DIV_MOD_KX jited:0 2176 PASS
> ARMv5 QEMU jit:		test_bpf: #3 DIV_MOD_KX jited:1 1104 PASS
> ARMv5 kirkwood nojit:	test_bpf: #3 DIV_MOD_KX jited:0 1103 PASS
> ARMv5 kirkwood jit:	test_bpf: #3 DIV_MOD_KX jited:1 311 PASS
> 
> Signed-off-by: Nicolas Schichan <nschichan@...ebox.fr>

Applied, thanks.
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