Alexei Starovoitov wrote:
> Add minimal support for program extensions. bpf_object_open_opts() needs to be
> called with attach_prog_fd = target_prog_fd and BPF program extension needs to
> have in .c file section definition like SEC("freplace/func_to_be_replaced").
> libbpf will search for "func_to_be_replaced" in the target_prog_fd's BTF and
> will pass it in attach_btf_id to the kernel. This approach works for tests, but
> more compex use case may need to request function name (and attach_btf_id that
> kernel sees) to be more dynamic. Such API will be added in future patches.
>
> Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
> ---
Acked-by: John Fastabend <john.fastabend@xxxxxxxxx>
