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libbpf: Add support for kprobe session attach

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Adding support to attach program in kprobe session mode
with bpf_program__attach_kprobe_multi_opts function.

Adding session bool to bpf_kprobe_multi_opts struct that allows
to load and attach the bpf program via kprobe session.
the attachment to create kprobe multi session.

Also adding new program loader section that allows:
 SEC("kprobe.session/bpf_fentry_test*")

and loads/attaches kprobe program as kprobe session.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240430112830.1184228-5-jolsa@kernel.org
This commit is contained in:
Jiri Olsa
2024-04-30 13:28:27 +02:00
committed by Andrii Nakryiko
parent b63d2945ff
commit 6c3cf5108e
3 changed files with 41 additions and 3 deletions
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4
src/libbpf.h
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@@ -539,10 +539,12 @@ struct bpf_kprobe_multi_opts {
size_t cnt;
/* create return kprobes */
bool retprobe;
/* create session kprobes */
bool session;
size_t :0;
};
#define bpf_kprobe_multi_opts__last_field retprobe
#define bpf_kprobe_multi_opts__last_field session
LIBBPF_API struct bpf_link *
bpf_program__attach_kprobe_multi_opts(const struct bpf_program *prog,