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-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 -- 2.1.0
