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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
This commit is contained in:
Alexei Starovoitov
2021-02-09 19:36:31 -08:00
committed by Andrii Nakryiko
parent 06ee116fb1
commit 1015d47c2b
1 changed files with 1 additions and 0 deletions
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include/uapi/linux/bpf.h
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@@ -4501,6 +4501,7 @@ struct bpf_prog_info {
__aligned_u64 prog_tags;
__u64 run_time_ns;
__u64 run_cnt;
__u64 recursion_misses;
} __attribute__((aligned(8)));
struct bpf_map_info {