bpf_map__set_inner_map_fd
LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd);
err = bpf_map__set_inner_map_fd(skel->maps.ringbuf_hash, proto_fd);
err = bpf_map__set_inner_map_fd(map, fd);
err = bpf_map__set_inner_map_fd(map, fd);