From: Matt Evans <[email protected]> Date: Thu, 21 Jul 2011 11:51:00 +1000
> 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 <[email protected]> Applied. _______________________________________________ Linuxppc-dev mailing list [email protected] https://lists.ozlabs.org/listinfo/linuxppc-dev
