[bpf-next,v3,0/6] Zbb support and code simplification for RV64 JIT

Message

Pu Lehui Jan. 15, 2024, 12:54 p.m. UTC

Add Zbb support [0] to optimize code size and performance of RV64 JIT.
Meanwhile, adjust the code for unification and simplification. Tests
test_bpf.ko and test_verifier have passed, as well as the relative
testcases of test_progs*.

Link: https://github.com/riscv/riscv-bitmanip/releases/download/1.0.0/bitmanip-1.0.0-38-g865e7a7.pdf [0]

v3:
- Change to early-exit code style and make code more explicit.

v2:
https://lore.kernel.org/bpf/[e-mail]
- Add runtime detection for Zbb instructions.
- Correct formatting issues detected by checkpatch.

v1:
https://lore.kernel.org/bpf/[e-mail]


Pu Lehui (6):
  riscv, bpf: Unify 32-bit sign-extension to emit_sextw
  riscv, bpf: Unify 32-bit zero-extension to emit_zextw
  riscv, bpf: Simplify sext and zext logics in branch instructions
  riscv, bpf: Add necessary Zbb instructions
  riscv, bpf: Optimize sign-extention mov insns with Zbb support
  riscv, bpf: Optimize bswap insns with Zbb support

 arch/riscv/net/bpf_jit.h        | 134 ++++++++++++++++++++
 arch/riscv/net/bpf_jit_comp64.c | 210 +++++++++++---------------------
 2 files changed, 205 insertions(+), 139 deletions(-)