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| author | Dmitrii Dolgov <9erthalion6@gmail.com> | 2022-03-09 17:31:12 +0100 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2022-03-15 15:07:27 -0700 |
| commit | cbdaf71f7e65a45d6e96378ee7bfe3da39c30908 (patch) | |
| tree | 8a74ca4a585b1b5d6b8a3b47e2d26bafa097f0d1 /tools/testing/selftests/bpf/prog_tests/linked_funcs.c | |
| parent | f98d6dd1e79d4b04c2e13e91a9348473cfa805a6 (diff) | |
bpftool: Add bpf_cookie to link output
Commit 82e6b1eee6a8 ("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
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/linked_funcs.c')
0 files changed, 0 insertions, 0 deletions