bpf: Add BPF_FETCH field / create atomic_fetch_add instruction

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The BPF_FETCH field can be set in bpf_insn.imm, for BPF_ATOMIC
instructions, in order to have the previous value of the
atomically-modified memory location loaded into the src register
after an atomic op is carried out.

Suggested-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210114181751.768687-7-jackmanb@google.com

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Brendan Jackman 2021-01-14 18:17:46 +00:00 • committed by Alexei Starovoitov

parent c5bcb5eb4d

commit 5ca419f286

8 changed files with 56 additions and 9 deletions

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4

arch/x86/net/bpf_jit_comp.c

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include/linux/filter.h

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3

include/uapi/linux/bpf.h

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kernel/bpf/core.c

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kernel/bpf/disasm.c

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33

kernel/bpf/verifier.c

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tools/include/linux/filter.h

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3

tools/include/uapi/linux/bpf.h

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