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/openbmc/linux/arch/riscv/net/ |
H A D | bpf_jit.h | dd642ccb Sun Apr 10 05:12:46 CDT 2022 Pu Lehui <pulehui@huawei.com> riscv, bpf: Implement more atomic operations for RV64
This patch implement more BPF atomic operations for RV64. The newly added operations are shown below:
atomic[64]_[fetch_]add atomic[64]_[fetch_]and atomic[64]_[fetch_]or atomic[64]_xchg atomic[64]_cmpxchg
Since riscv specification does not provide AMO instruction for CAS operation, we use lr/sc instruction for cmpxchg operation, and AMO instructions for the rest ops.
Tests "test_bpf.ko" and "test_progs -t atomic" have passed, as well as "test_verifier" with no new failure cases.
Signed-off-by: Pu Lehui <pulehui@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Song Liu <songliubraving@fb.com> Acked-by: Björn Töpel <bjorn@kernel.org> Link: https://lore.kernel.org/bpf/20220410101246.232875-1-pulehui@huawei.com
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H A D | bpf_jit_comp64.c | dd642ccb Sun Apr 10 05:12:46 CDT 2022 Pu Lehui <pulehui@huawei.com> riscv, bpf: Implement more atomic operations for RV64
This patch implement more BPF atomic operations for RV64. The newly added operations are shown below:
atomic[64]_[fetch_]add atomic[64]_[fetch_]and atomic[64]_[fetch_]or atomic[64]_xchg atomic[64]_cmpxchg
Since riscv specification does not provide AMO instruction for CAS operation, we use lr/sc instruction for cmpxchg operation, and AMO instructions for the rest ops.
Tests "test_bpf.ko" and "test_progs -t atomic" have passed, as well as "test_verifier" with no new failure cases.
Signed-off-by: Pu Lehui <pulehui@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Song Liu <songliubraving@fb.com> Acked-by: Björn Töpel <bjorn@kernel.org> Link: https://lore.kernel.org/bpf/20220410101246.232875-1-pulehui@huawei.com
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