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authorNicolas Schichan <nschichan@freebox.fr>2015-10-02 17:06:47 +0200
committerDavid S. Miller <davem@davemloft.net>2015-10-05 07:02:42 -0700
commit4560cdff03a76348ee5fae48e3c7914e4de2db5b (patch)
treebf49e0f4eeecaf5be9af85af14b203978e54b9ba /kernel/bpf/arraymap.c
parentdf7b6015421babdf0fe7c0061dcc0bddf8ebab09 (diff)
downloadlinux-sh-4560cdff03a76348ee5fae48e3c7914e4de2db5b.tar.gz
ARM: net: support BPF_ALU | BPF_MOD instructions in the BPF JIT.
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> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf/arraymap.c')
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