On 9/1/22 4:27 AM, Tiezhu Yang wrote:
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.
For bpf-next tree this doesn't apply cleanly. Huacai, probably easier if you
take it in. Otherwise this needs rebase (and your Ack as arch maintainer), but
then there'll be merge conflict later anyway.
[...]
Applying: LoongArch: Move {signed,unsigned}_imm_check() to inst.h
Applying: LoongArch: Add some instruction opcodes and formats
error: patch failed: arch/loongarch/include/asm/inst.h:18
error: arch/loongarch/include/asm/inst.h: patch does not apply
Patch failed at 0002 LoongArch: Add some instruction opcodes and formats
[...]
Thanks,
Daniel
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-email-yangtiezhu@xxxxxxxxxxx/
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@xxxxxxxxxxx/
RFC:
https://lore.kernel.org/bpf/1660013580-19053-1-git-send-email-yangtiezhu@xxxxxxxxxxx/
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
