mbox series

[bpf-next,v2,0/4] Add BPF JIT support for LoongArch

Message ID 1661857809-10828-1-git-send-email-yangtiezhu@loongson.cn (mailing list archive)
Headers show
Series Add BPF JIT support for LoongArch | expand

Message

Tiezhu Yang Aug. 30, 2022, 11:10 a.m. UTC 
The basic support for LoongArch has been merged into the upstream Linux
kernel since 5.19-rc1 on June 5, 2022, this patch series adds BPF JIT
support for LoongArch.

Here is the LoongArch documention:
https://www.kernel.org/doc/html/latest/loongarch/index.html

With this patch series, the test cases in lib/test_bpf.ko have passed
on LoongArch.

  # echo 1 > /proc/sys/net/core/bpf_jit_enable
  # modprobe test_bpf
  # dmesg | grep Summary
  test_bpf: Summary: 1026 PASSED, 0 FAILED, [1014/1014 JIT'ed]
  test_bpf: test_tail_calls: Summary: 10 PASSED, 0 FAILED, [10/10 JIT'ed]
  test_bpf: test_skb_segment: Summary: 2 PASSED, 0 FAILED

It seems that this patch series can not be applied cleanly to bpf-next
which is not synced to v6.0-rc3.

v2:
  -- Rebased series on v6.0-rc3
  -- Make build_epilogue() static
  -- Use alsl.d, bstrpick.d, [ld/st]ptr.[w/d] to save some instructions
  -- Replace move_imm32() and move_imm64() with move_imm() and optimize it
  -- Add code comments to explain the considerations of conditional jump

v1:
  -- Rebased series on v6.0-rc1
  -- Move {signed,unsigned}_imm_check() to inst.h
  -- Define the imm field as "unsigned int" in the instruction format
  -- Use DEF_EMIT_*_FORMAT to define the same kind of instructions
  -- Use "stack_adjust += sizeof(long) * 8" in build_prologue()
  https://lore.kernel.org/bpf/1660996260-11337-1-git-send-email-yangtiezhu@loongson.cn/

RFC:
  https://lore.kernel.org/bpf/1660013580-19053-1-git-send-email-yangtiezhu@loongson.cn/

Tiezhu Yang (4):
  LoongArch: Move {signed,unsigned}_imm_check() to inst.h
  LoongArch: Add some instruction opcodes and formats
  LoongArch: Add BPF JIT support
  LoongArch: Enable BPF_JIT and TEST_BPF in default config

 arch/loongarch/Kbuild                      |    1 +
 arch/loongarch/Kconfig                     |    1 +
 arch/loongarch/configs/loongson3_defconfig |    2 +
 arch/loongarch/include/asm/inst.h          |  383 ++++++++-
 arch/loongarch/kernel/module.c             |   10 -
 arch/loongarch/net/Makefile                |    7 +
 arch/loongarch/net/bpf_jit.c               | 1160 ++++++++++++++++++++++++++++
 arch/loongarch/net/bpf_jit.h               |  282 +++++++
 8 files changed, 1831 insertions(+), 15 deletions(-)
 create mode 100644 arch/loongarch/net/Makefile
 create mode 100644 arch/loongarch/net/bpf_jit.c
 create mode 100644 arch/loongarch/net/bpf_jit.h