bpf: Count the number of times recursion was prevented

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Add per-program counter for number of times recursion prevention mechanism
was triggered and expose it via show_fdinfo and bpf_prog_info.
Teach bpftool to print it.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210210033634.62081-7-alexei.starovoitov@gmail.com

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Alexei Starovoitov 2021-02-09 19:36:31 -08:00 • committed by Daniel Borkmann

parent 406c557edc

commit 9ed9e9ba23

6 changed files with 33 additions and 6 deletions

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1

include/linux/filter.h

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1

include/uapi/linux/bpf.h

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14

kernel/bpf/syscall.c

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18

kernel/bpf/trampoline.c

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4

tools/bpf/bpftool/prog.c

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1

tools/include/uapi/linux/bpf.h

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