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| author | Nicolas Schichan <nschichan@freebox.fr> | 2015-10-02 17:06:47 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-10-05 07:02:42 -0700 |
| commit | 4560cdff03a76348ee5fae48e3c7914e4de2db5b (patch) | |
| tree | bf49e0f4eeecaf5be9af85af14b203978e54b9ba /arch/arm/net/bpf_jit_32.h | |
| parent | df7b6015421babdf0fe7c0061dcc0bddf8ebab09 (diff) | |
| download | op-kernel-dev-4560cdff03a76348ee5fae48e3c7914e4de2db5b.zip op-kernel-dev-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 'arch/arm/net/bpf_jit_32.h')
| -rw-r--r-- | arch/arm/net/bpf_jit_32.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm/net/bpf_jit_32.h b/arch/arm/net/bpf_jit_32.h index 4b17d5ab..c46fca2 100644 --- a/arch/arm/net/bpf_jit_32.h +++ b/arch/arm/net/bpf_jit_32.h @@ -115,6 +115,8 @@ #define ARM_INST_UMULL 0x00800090 +#define ARM_INST_MLS 0x00600090 + /* * Use a suitable undefined instruction to use for ARM/Thumb2 faulting. * We need to be careful not to conflict with those used by other modules @@ -210,4 +212,7 @@ #define ARM_UMULL(rd_lo, rd_hi, rn, rm) (ARM_INST_UMULL | (rd_hi) << 16 \ | (rd_lo) << 12 | (rm) << 8 | rn) +#define ARM_MLS(rd, rn, rm, ra) (ARM_INST_MLS | (rd) << 16 | (rn) | (rm) << 8 \ + | (ra) << 12) + #endif /* PFILTER_OPCODES_ARM_H */ |
