selftests/bpf: Move some tc_helpers.h functions to test_progs.h

Move static inline functions id_from_prog_fd() and id_from_link_fd()
from prog_tests/tc_helpers.h to test_progs.h so these two functions
can be reused for later cgroup mprog selftests.

Signed-off-by: Yonghong Song <[e-mail]>
Signed-off-by: Andrii Nakryiko <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

tools/testing/selftests/bpf/prog_tests/tc_helpers.h

···
 # define loopback 1
 #endif
 
-static inline __u32 id_from_prog_fd(int fd)
-{
-	struct bpf_prog_info prog_info = {};
-	__u32 prog_info_len = sizeof(prog_info);
-	int err;
-
-	err = bpf_obj_get_info_by_fd(fd, &prog_info, &prog_info_len);
-	if (!ASSERT_OK(err, "id_from_prog_fd"))
-		return 0;
-
-	ASSERT_NEQ(prog_info.id, 0, "prog_info.id");
-	return prog_info.id;
-}
-
-static inline __u32 id_from_link_fd(int fd)
-{
-	struct bpf_link_info link_info = {};
-	__u32 link_info_len = sizeof(link_info);
-	int err;
-
-	err = bpf_link_get_info_by_fd(fd, &link_info, &link_info_len);
-	if (!ASSERT_OK(err, "id_from_link_fd"))
-		return 0;
-
-	ASSERT_NEQ(link_info.id, 0, "link_info.id");
-	return link_info.id;
-}
-
 static inline __u32 ifindex_from_link_fd(int fd)
 {
 	struct bpf_link_info link_info = {};

tools/testing/selftests/bpf/test_progs.h

···
 	return (void *) (unsigned long) ptr;
 }
 
+static inline __u32 id_from_prog_fd(int fd)
+{
+	struct bpf_prog_info prog_info = {};
+	__u32 prog_info_len = sizeof(prog_info);
+	int err;
+
+	err = bpf_obj_get_info_by_fd(fd, &prog_info, &prog_info_len);
+	if (!ASSERT_OK(err, "id_from_prog_fd"))
+		return 0;
+
+	ASSERT_NEQ(prog_info.id, 0, "prog_info.id");
+	return prog_info.id;
+}
+
+static inline __u32 id_from_link_fd(int fd)
+{
+	struct bpf_link_info link_info = {};
+	__u32 link_info_len = sizeof(link_info);
+	int err;
+
+	err = bpf_link_get_info_by_fd(fd, &link_info, &link_info_len);
+	if (!ASSERT_OK(err, "id_from_link_fd"))
+		return 0;
+
+	ASSERT_NEQ(link_info.id, 0, "link_info.id");
+	return link_info.id;
+}
+
 int bpf_find_map(const char *test, struct bpf_object *obj, const char *name);
 int compare_map_keys(int map1_fd, int map2_fd);
 int compare_stack_ips(int smap_fd, int amap_fd, int stack_trace_len);