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Message-ID: <mb61pzft0zk8k.fsf@kernel.org>
Date: Wed, 08 May 2024 10:11:23 +0000
From: Puranjay Mohan <puranjay@...nel.org>
To: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
<daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Martin KaFai
Lau <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>, Song Liu
<song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, John Fastabend
<john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, Stanislav
Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa
<jolsa@...nel.org>, Zi Shen Lim <zlim.lnx@...il.com>, Catalin Marinas
<catalin.marinas@....com>, Will Deacon <will@...nel.org>, Mykola Lysenko
<mykolal@...com>, Shuah Khan <shuah@...nel.org>, bpf@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next] bpf, arm64: Add support for lse atomics in
bpf_arena
Puranjay Mohan <puranjay@...nel.org> writes:
> When LSE atomics are available, BPF atomic instructions are implemented
> as single ARM64 atomic instructions, therefore it is easy to enable
> these in bpf_arena using the currently available exception handling
> setup.
>
> LL_SC atomics use loops and therefore would need more work to enable in
> bpf_arena.
>
> Enable LSE atomics based instructions in bpf_arena and use the
> bpf_jit_supports_insn() callback to reject atomics in bpf_arena if LSE
> atomics are not available.
>
> All atomics and arena_atomics selftests are passing:
>
> [root@...172-31-2-216 bpf]# ./test_progs -a atomics,arena_atomics
> #3/1 arena_atomics/add:OK
> #3/2 arena_atomics/sub:OK
> #3/3 arena_atomics/and:OK
> #3/4 arena_atomics/or:OK
> #3/5 arena_atomics/xor:OK
> #3/6 arena_atomics/cmpxchg:OK
> #3/7 arena_atomics/xchg:OK
> #3 arena_atomics:OK
> #10/1 atomics/add:OK
> #10/2 atomics/sub:OK
> #10/3 atomics/and:OK
> #10/4 atomics/or:OK
> #10/5 atomics/xor:OK
> #10/6 atomics/cmpxchg:OK
> #10/7 atomics/xchg:OK
> #10 atomics:OK
> Summary: 2/14 PASSED, 0 SKIPPED, 0 FAILED
Gentle ping about this,
Thanks,
Puranjay
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