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Commit 82e6b1eee6 ("bpf: Allow to specify user-provided bpf_cookie for
BPF perf links") introduced the concept of user specified bpf_cookie,
which could be accessed by BPF programs using bpf_get_attach_cookie().
For troubleshooting purposes it is convenient to expose bpf_cookie via
bpftool as well, so there is no need to meddle with the target BPF
program itself.
Implemented using the pid iterator BPF program to actually fetch
bpf_cookies, which allows constraining code changes only to bpftool.
$ bpftool link
1: type 7 prog 5
bpf_cookie 123
pids bootstrap(81)
Signed-off-by: Dmitrii Dolgov <9erthalion6@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20220309163112.24141-1-9erthalion6@gmail.com
15 lines
252 B
C
15 lines
252 B
C
/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
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/* Copyright (c) 2020 Facebook */
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#ifndef __PID_ITER_H
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#define __PID_ITER_H
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struct pid_iter_entry {
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__u32 id;
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int pid;
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__u64 bpf_cookie;
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bool has_bpf_cookie;
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char comm[16];
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};
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#endif
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