libbpf: deprecate bpf_program__is_<type>() and bpf_program__set_<type>() APIs

Not sure why these APIs were added in the first place instead of
a completely generic (and not requiring constantly adding new APIs with
each new BPF program type) bpf_program__type() and
bpf_program__set_type() APIs. But as it is right now, there are 13 such
specialized is_type/set_type APIs, while latest kernel is already at 30+
BPF program types.

Instead of completing the set of APIs and keep chasing kernel's
bpf_prog_type enum, deprecate existing subset and recommend generic
bpf_program__type() and bpf_program__set_type() APIs.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20220124194254.2051434-4-andrii@kernel.orgSigned-off-by: Alexei Starovoitov <ast@kernel.org>

tools/lib/bpf/libbpf.h

@@ -593,18 +593,31 @@ LIBBPF_API int bpf_program__nth_fd(const struct bpf_program *prog, int n);
 /*
  * Adjust type of BPF program. Default is kprobe.
  */
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_lsm(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_tracing(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_struct_ops(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_extension(struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__set_type() instead")
 LIBBPF_API int bpf_program__set_sk_lookup(struct bpf_program *prog);
 
 LIBBPF_API enum bpf_prog_type bpf_program__type(const struct bpf_program *prog);
@@ -633,18 +646,31 @@ LIBBPF_API int
 bpf_program__set_attach_target(struct bpf_program *prog, int attach_prog_fd,
 			       const char *attach_func_name);
 
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_socket_filter(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_tracepoint(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_raw_tracepoint(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_kprobe(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_lsm(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_sched_cls(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_sched_act(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_xdp(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_tracing(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_struct_ops(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_extension(const struct bpf_program *prog);
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_program__type() instead")
 LIBBPF_API bool bpf_program__is_sk_lookup(const struct bpf_program *prog);
 
 /*