When generating a light skeleton (bpftool gen skeleton -L), there is no
libbpf runtime object or bpf_program__set_autoload() API available to
enable/disable the autoloading of programs. If a BPF program in the
object has autoload disabled (e.g. via SEC("?...")), bpf_object__load()
silently skips loading it. bpftool still generates struct bpf_prog_desc
fields and attach functions in the light skeleton header, leaving
skel->progs.<name>.prog_fd uninitialized (0).Explicitly reject non-autoloaded programs when use_loader is true with an error message, preventing the generation of broken light skeleton headers. Signed-off-by: Thiébaud Weksteen <[email protected]> --- tools/bpf/bpftool/gen.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c index a50540ef6521..1583150241c8 100644 --- a/tools/bpf/bpftool/gen.c +++ b/tools/bpf/bpftool/gen.c @@ -1340,6 +1340,12 @@ static int do_skeleton(int argc, char **argv) } bpf_object__for_each_program(prog, obj) { prog_cnt++; + + if (use_loader && !bpf_program__autoload(prog)) { + p_err("program '%s' is marked as non-autoload, which is not supported for light skeletons", + bpf_program__name(prog)); + return -1; + } } get_header_guard(header_guard, obj_name, "SKEL_H"); -- 2.55.0.979.g7e5102b832-goog
