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libbpf: Add support for freplace attachment in bpf_link_create

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This adds support for supplying a target btf ID for the bpf_link_create()
operation, and adds a new bpf_program__attach_freplace() high-level API for
attaching freplace functions with a target.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/160138355387.48470.18026176785351166890.stgit@toke.dk
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Toke Høiland-Jørgensen authored and Andrii Nakryiko committed 2020-09-29 18:29:49 -07:00
1 parent 5e359219aa
commit e40af4de0c
5 files changed
+60 -9
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src/bpf.h
+2 -1
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@@ -174,8 +174,9 @@ struct bpf_link_create_opts {
__u32 flags;
union bpf_iter_link_info *iter_info;
__u32 iter_info_len;
__u32 target_btf_id;
};
#define bpf_link_create_opts__last_field iter_info_len
#define bpf_link_create_opts__last_field target_btf_id
LIBBPF_API int bpf_link_create(int prog_fd, int target_fd,
enum bpf_attach_type attach_type,