Re: [PATCH bpf-next 00/10] Add support arena atomics for RV64

[Pu Lehui <pulehui@huaweicloud.com>]

On 2025/8/15 16:55, Daniel Borkmann wrote:
> On 8/5/25 8:52 AM, Pu Lehui wrote:
>> On 2025/8/5 14:38, Björn Töpel wrote:
>>> Pu Lehui <pulehui@huaweicloud.com> writes:
>>>
>>>> From: Pu Lehui <pulehui@huawei.com>
>>>>
>>>> patch 1-3 refactor redundant load and store operations.
>>>> patch 4-7 add Zacas instructions for cmpxchg.
>>>> patch 8 optimizes exception table handling.
>>>> patch 9-10 add support arena atomics for RV64.
>>>>
>>>> Tests `test_progs -t atomic,arena` have passed as shown bellow,
>>>> as well as `test_verifier` and `test_bpf.ko` have passed.
>>>
>>> [...]
>>>
>>>> Pu Lehui (10):
>>>>    riscv, bpf: Extract emit_stx() helper
>>>>    riscv, bpf: Extract emit_st() helper
>>>>    riscv, bpf: Extract emit_ldx() helper
>>>>    riscv: Separate toolchain support dependency from RISCV_ISA_ZACAS
>>>>    riscv, bpf: Add rv_ext_enabled macro for runtime detection 
>>>> extentsion
>>>>    riscv, bpf: Add Zacas instructions
>>>>    riscv, bpf: Optimize cmpxchg insn with Zacas support
>>>>    riscv, bpf: Add ex_insn_off and ex_jmp_off for exception table
>>>>      handling
>>>>    riscv, bpf: Add support arena atomics for RV64
>>>>    selftests/bpf: Enable arena atomics tests for RV64
>>>>
>>>>   arch/riscv/Kconfig                            |   1 -
>>>>   arch/riscv/include/asm/cmpxchg.h              |   6 +-
>>>>   arch/riscv/kernel/setup.c                     |   1 +
>>>>   arch/riscv/net/bpf_jit.h                      |  70 ++-
>>>>   arch/riscv/net/bpf_jit_comp64.c               | 516 
>>>> +++++-------------
>>>>   .../selftests/bpf/progs/arena_atomics.c       |   9 +-
>>>>   6 files changed, 214 insertions(+), 389 deletions(-)
>>>
>>> What a nice series! The best kind of changeset -- new feature, less
>>> code! Thank you, Lehui! Again, apologies for the horrible SLA. The
>>> weather in Sweden was simply Too Good this summer!
>>
>> Sounds like a great vacation!
> 
> Thanks for working on this! I just took this into bpf-next, please also
> make sure to address the small follow-up request from Bjorn.

Hi Daniel,

Already explained and aligned with Bjorn, no further processing is 
required. Thanks.

> 
>>> Tested-by: Björn Töpel <bjorn@rivosinc.com> # QEMU only
>>> Acked-by: Björn Töpel <bjorn@kernel.org>
> 
> Thanks,
> Daniel


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