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bpf: Add link_info support for uprobe multi link

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Adding support to get uprobe_link details through bpf_link_info
interface.

Adding new struct uprobe_multi to struct bpf_link_info to carry
the uprobe_multi link details.

The uprobe_multi.count is passed from user space to denote size
of array fields (offsets/ref_ctr_offsets/cookies). The actual
array size is stored back to uprobe_multi.count (allowing user
to find out the actual array size) and array fields are populated
up to the user passed size.

All the non-array fields (path/count/flags/pid) are always set.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/bpf/20231125193130.834322-4-jolsa@kernel.org
This commit is contained in:
Jiri Olsa
2023-11-25 20:31:27 +01:00
committed by Andrii Nakryiko
parent 4930b7f53a
commit e56fdbfb06
3 changed files with 92 additions and 0 deletions
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10
include/uapi/linux/bpf.h
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@@ -6562,6 +6562,16 @@ struct bpf_link_info {
__u32 flags;
__u64 missed;
} kprobe_multi;
struct {
__aligned_u64 path;
__aligned_u64 offsets;
__aligned_u64 ref_ctr_offsets;
__aligned_u64 cookies;
__u32 path_size; /* in/out: real path size on success, including zero byte */
__u32 count; /* in/out: uprobe_multi offsets/ref_ctr_offsets/cookies count */
__u32 flags;
__u32 pid;
} uprobe_multi;
struct {
__u32 type; /* enum bpf_perf_event_type */
__u32 :32;