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

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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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72

kernel/trace/bpf_trace.c

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10

tools/include/uapi/linux/bpf.h

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