From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH net-next V2] ARM: net: support BPF_ALU | BPF_MOD instructions in the BPF JIT. Date: Mon, 05 Oct 2015 07:03:14 -0700 (PDT) Message-ID: <20151005.070314.997252169637059167.davem@davemloft.net> References: <1443798407-19154-1-git-send-email-nschichan@freebox.fr> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: linux@arm.linux.org.uk, mgherzan@gmail.com, daniel@iogearbox.net, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: nschichan@freebox.fr Return-path: In-Reply-To: <1443798407-19154-1-git-send-email-nschichan@freebox.fr> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Nicolas Schichan 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:" 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 Applied, thanks.