diff options
| author | Matt Evans <matt@ozlabs.org> | 2011-07-20 15:51:00 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-07-21 12:38:32 -0700 |
| commit | 0ca87f05ba8bdc6791c14878464efc901ad71e99 (patch) | |
| tree | c37e25b30c22adae633dcacb2236e83086887418 /arch/powerpc/Makefile | |
| parent | 3aeb7d2243e55ddcad3c0b402e7b09619a67f5da (diff) | |
net: filter: BPF 'JIT' compiler for PPC64
An implementation of a code generator for BPF programs to speed up packet
filtering on PPC64, inspired by Eric Dumazet's x86-64 version.
Filter code is generated as an ABI-compliant function in module_alloc()'d mem
with stackframe & prologue/epilogue generated if required (simple filters don't
need anything more than an li/blr). The filter's local variables, M[], live in
registers. Supports all BPF opcodes, although "complicated" loads from negative
packet offsets (e.g. SKF_LL_OFF) are not yet supported.
There are a couple of further optimisations left for future work; many-pass
assembly with branch-reach reduction and a register allocator to push M[]
variables into volatile registers would improve the code quality further.
This currently supports big-endian 64-bit PowerPC only (but is fairly simple
to port to PPC32 or LE!).
Enabled in the same way as x86-64:
echo 1 > /proc/sys/net/core/bpf_jit_enable
Or, enabled with extra debug output:
echo 2 > /proc/sys/net/core/bpf_jit_enable
Signed-off-by: Matt Evans <matt@ozlabs.org>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/powerpc/Makefile')
| -rw-r--r-- | arch/powerpc/Makefile | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index b7212b619c5..b94740f36b1 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -154,7 +154,8 @@ core-y += arch/powerpc/kernel/ \ arch/powerpc/lib/ \ arch/powerpc/sysdev/ \ arch/powerpc/platforms/ \ - arch/powerpc/math-emu/ + arch/powerpc/math-emu/ \ + arch/powerpc/net/ core-$(CONFIG_XMON) += arch/powerpc/xmon/ core-$(CONFIG_KVM) += arch/powerpc/kvm/ |