Re: [PATCH net-next V2] ARM: net: support BPF_ALU | BPF_MOD instructions in the BPF JIT.

From	David Miller <davem@davemloft.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH net-next V2] ARM: net: support BPF_ALU \| BPF_MOD instructions in the BPF JIT.
Date	2015-10-05 15:50 +0200
Message-ID	<qgejn-uJ-7@gated-at.bofh.it> (permalink)
References	<qfa8b-6Wx-23@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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From: Nicolas Schichan <nschichan@freebox.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@freebox.fr>

Applied, thanks.
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[PATCH net-next V2] ARM: net: support BPF_ALU | BPF_MOD instructions in the BPF JIT. Nicolas Schichan <nschichan@freebox.fr> - 2015-10-02 17:10 +0200
  Re: [PATCH net-next V2] ARM: net: support BPF_ALU | BPF_MOD  instructions in the BPF JIT. Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-10-02 17:30 +0200
  Re: [PATCH net-next V2] ARM: net: support BPF_ALU | BPF_MOD  instructions in the BPF JIT. David Miller <davem@davemloft.net> - 2015-10-05 15:50 +0200

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