netdev - [PATCH bpf-next 0/2] arm64, bpf: support more atomic ops

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Date:   Fri, 21 Jan 2022 21:56:30 +0800
From:   Hou Tao <houtao1@...wei.com>
To:     Alexei Starovoitov <ast@...nel.org>
CC:     Martin KaFai Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Song Liu <songliubraving@...com>,
        "David S . Miller" <davem@...emloft.net>,
        John Fastabend <john.fastabend@...il.com>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <houtao1@...wei.com>, Zi Shen Lim <zlim.lnx@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Julien Thierry <jthierry@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH bpf-next 0/2] arm64, bpf: support more atomic ops

Hi,

Atomics support in bpf has already been done by "Atomics for eBPF"
patch series [1], but it only adds support for x86, and this patchset
adds support for arm64.

Patch #1 changes the type of test program from fentry/ to raw_tp/ for
atomics test, because bpf trampoline is not available for arm64 now.
After the change, atomics test will be available for arm64 and other
arches.

Patch #2 implements atomic[64]_fetch_add, atomic[64]_[fetch_]{and,or,xor}
and atomic[64]_{xchg|cmpxchg} for arm64. For no-LSE-ATOMICS case and
cpus_have_cap(ARM64_HAS_LSE_ATOMICS) case, both ./test_verifier and
"./test_progs -t atomic" are exercised and passed correspondingly.

Comments are always welcome.

Regards,
Tao

Hou Tao (2):
  selftests/bpf: use raw_tp program for atomic test
  arm64, bpf: support more atomic operations

 arch/arm64/include/asm/insn.h                 |  45 +++-
 arch/arm64/lib/insn.c                         | 155 +++++++++++--
 arch/arm64/net/bpf_jit.h                      |  43 +++-
 arch/arm64/net/bpf_jit_comp.c                 | 216 ++++++++++++++----
 .../selftests/bpf/prog_tests/atomics.c        | 114 +++------
 tools/testing/selftests/bpf/progs/atomics.c   |  29 +--
 6 files changed, 438 insertions(+), 164 deletions(-)

-- 
2.27.0