riscv, bpf: Implement more atomic operations for RV64

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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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This commit is contained in:

Pu Lehui 2022-04-10 18:12:46 +08:00 • committed by Daniel Borkmann

parent 33fc250c3e

commit dd642ccb45

2 changed files with 153 additions and 24 deletions

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67

arch/riscv/net/bpf_jit.h

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110

arch/riscv/net/bpf_jit_comp64.c

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