| From: |
| Tiezhu Yang <yangtiezhu-AT-loongson.cn> |
| To: |
| Huacai Chen <chenhuacai-AT-kernel.org>, Alexei Starovoitov <ast-AT-kernel.org>, Daniel Borkmann <daniel-AT-iogearbox.net>, Andrii Nakryiko <andrii-AT-kernel.org> |
| Subject: |
| [PATCH bpf-next v3 0/4] Add BPF JIT support for LoongArch |
| Date: |
| Thu, 01 Sep 2022 10:27:25 +0800 |
| Message-ID: |
| <1661999249-10258-1-git-send-email-yangtiezhu@loongson.cn> |
| Cc: |
| bpf-AT-vger.kernel.org, loongarch-AT-lists.linux.dev |
| Archive-link: |
| Article |
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.
v3:
-- Remove CONFIG_TEST_BPF in loongson3_defconfig
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
https://lore.kernel.org/bpf/1661857809-10828-1-git-send-e...
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-e...
RFC:
https://lore.kernel.org/bpf/1660013580-19053-1-git-send-e...
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 in default config
arch/loongarch/Kbuild | 1 +
arch/loongarch/Kconfig | 1 +
arch/loongarch/configs/loongson3_defconfig | 1 +
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, 1830 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
--
2.1.0
