[RFC PATCH 0/6] eBPF JIT for PPC64

[Naveen N. Rao]

Implement extended BPF JIT for ppc64. We retain the classic BPF JIT for
ppc32 and move ppc64 BE/LE to use the new JIT. Classic BPF filters will
be converted to extended BPF (see convert_filter()) and JIT'ed with the
new compiler.

Most of the existing macros are retained and fixed/enhanced where
appropriate. Patches 1-4 are geared towards this.

Patch 5 breaks out the classic BPF JIT specifics into a separate
bpf_jit32.h header file, while retaining all the generic instruction
macros in bpf_jit.h. Most of these macros can potentially be generalized
and moved to more common code (tagged with a TODO in patch 6).

Patch 6 implements eBPF JIT for ppc64.

This is still *early* *RFC* and there are still a few instruction
classes to be JIT'ed. I am posting this in advance so as to get early
feedback. Kindly review the same and if possible, try it out and let me
know how it goes!


- Naveen

Naveen N. Rao (6):
  ppc: bpf/jit: Fix/enhance 32-bit Load Immediate implementation
  ppc: bpf/jit: Optimize 64-bit Immediate loads
  ppc: bpf/jit: Introduce rotate immediate instructions
  ppc: bpf/jit: A few cleanups
  ppc: bpf/jit: Isolate classic BPF JIT specifics into a separate header
  ppc: ebpf/jit: Implement JIT compiler for extended BPF

 arch/powerpc/include/asm/ppc-opcode.h |  21 +-
 arch/powerpc/net/Makefile             |   4 +
 arch/powerpc/net/bpf_jit.h            | 251 +++++------
 arch/powerpc/net/bpf_jit32.h          | 140 ++++++
 arch/powerpc/net/bpf_jit64.h          |  58 +++
 arch/powerpc/net/bpf_jit_asm.S        |   2 +-
 arch/powerpc/net/bpf_jit_comp.c       |  10 +-
 arch/powerpc/net/bpf_jit_comp64.c     | 828 ++++++++++++++++++++++++++++++++++
 8 files changed, 1163 insertions(+), 151 deletions(-)
 create mode 100644 arch/powerpc/net/bpf_jit32.h
 create mode 100644 arch/powerpc/net/bpf_jit64.h
 create mode 100644 arch/powerpc/net/bpf_jit_comp64.c

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2.7.4