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bpf: Add support for BPF_OBJ_GET_INFO_BY_FD for bpf_link

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Add ability to fetch bpf_link details through BPF_OBJ_GET_INFO_BY_FD command.
Also enhance show_fdinfo to potentially include bpf_link type-specific
information (similarly to obj_info).

Also introduce enum bpf_link_type stored in bpf_link itself and expose it in
UAPI. bpf_link_tracing also now will store and return bpf_attach_type.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200429001614.1544-5-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-04-28 17:16:08 -07:00 • committed by Alexei Starovoitov
parent 2d602c8cf4
commit f2e10bff16
9 changed files with 253 additions and 24 deletions
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2
include/linux/bpf-cgroup.h
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@ -57,8 +57,6 @@ struct bpf_cgroup_link {
enum bpf_attach_type type;
};
extern const struct bpf_link_ops bpf_cgroup_link_lops;
struct bpf_prog_list {
struct list_head node;
struct bpf_prog *prog;