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
archs.
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
[1]: https://lore.kernel.org/bpf/20210114181751.768687-2-jackmanb@xxxxxxxxxx/
Change Log:
v2:
* patch #1: use two seperated ASSERT_OK() instead of ASSERT_TRUE()
* add Acked-by tag for both patches
v1: https://lore.kernel.org/bpf/20220121135632.136976-1-houtao1@xxxxxxxxxx/
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 | 121 +++-------
tools/testing/selftests/bpf/progs/atomics.c | 28 +--
6 files changed, 444 insertions(+), 164 deletions(-)
--
2.27.0
