From: Puranjay Mohan <puranjay@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>, Zi Shen Lim <zlim.lnx@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Mykola Lysenko <mykolal@fb.com>,
Shuah Khan <shuah@kernel.org>,
bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: Re: [PATCH bpf-next] bpf, arm64: Add support for lse atomics in bpf_arena
Date: Wed, 08 May 2024 10:11:23 +0000 [thread overview]
Message-ID: <mb61pzft0zk8k.fsf@kernel.org> (raw)
In-Reply-To: <20240426161116.441-1-puranjay@kernel.org>
Puranjay Mohan <puranjay@kernel.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@ip-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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next prev parent reply other threads:[~2024-05-08 10:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-26 16:11 [PATCH bpf-next] bpf, arm64: Add support for lse atomics in bpf_arena Puranjay Mohan
2024-05-08 10:11 ` Puranjay Mohan [this message]
2024-05-08 14:40 ` patchwork-bot+netdevbpf
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