[PATCH v2 1/4] selftests/bpf: test_progs/sockopt_sk: Convert to use BPF skeleton

[Yauheni Kaliuta <yauheni.kaliuta@xxxxxxxxxx>]

Switch the test to use BPF skeleton to save some boilerplate and
make it easy to access bpf program bss segment.

The latter will be used to pass PAGE_SIZE from userspace since there
is no convenient way for bpf program to get it from inside of the
kernel.

Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@xxxxxxxxxx>
---
 .../selftests/bpf/prog_tests/sockopt_sk.c     | 72 ++++++-------------
 1 file changed, 23 insertions(+), 49 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c b/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c
index d5b44b135c00..114c1a622ffa 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c
@@ -3,6 +3,7 @@
 #include "cgroup_helpers.h"
 
 #include <linux/tcp.h>
+#include "sockopt_sk.skel.h"
 
 #ifndef SOL_TCP
 #define SOL_TCP IPPROTO_TCP
@@ -191,60 +192,33 @@ static int getsetsockopt(void)
 	return -1;
 }
 
-static int prog_attach(struct bpf_object *obj, int cgroup_fd, const char *title)
-{
-	enum bpf_attach_type attach_type;
-	enum bpf_prog_type prog_type;
-	struct bpf_program *prog;
-	int err;
-
-	err = libbpf_prog_type_by_name(title, &prog_type, &attach_type);
-	if (err) {
-		log_err("Failed to deduct types for %s BPF program", title);
-		return -1;
-	}
-
-	prog = bpf_object__find_program_by_title(obj, title);
-	if (!prog) {
-		log_err("Failed to find %s BPF program", title);
-		return -1;
-	}
-
-	err = bpf_prog_attach(bpf_program__fd(prog), cgroup_fd,
-			      attach_type, 0);
-	if (err) {
-		log_err("Failed to attach %s BPF program", title);
-		return -1;
-	}
-
-	return 0;
-}
-
 static void run_test(int cgroup_fd)
 {
-	struct bpf_prog_load_attr attr = {
-		.file = "./sockopt_sk.o",
-	};
-	struct bpf_object *obj;
-	int ignored;
-	int err;
-
-	err = bpf_prog_load_xattr(&attr, &obj, &ignored);
-	if (CHECK_FAIL(err))
-		return;
-
-	err = prog_attach(obj, cgroup_fd, "cgroup/getsockopt");
-	if (CHECK_FAIL(err))
-		goto close_bpf_object;
-
-	err = prog_attach(obj, cgroup_fd, "cgroup/setsockopt");
-	if (CHECK_FAIL(err))
-		goto close_bpf_object;
+	struct sockopt_sk *skel;
+	int duration = 0;
+
+	skel = sockopt_sk__open_and_load();
+	if (CHECK(!skel, "skel_load", "sockopt_sk skeleton failed\n"))
+		goto cleanup;
+
+	skel->links._setsockopt =
+		bpf_program__attach_cgroup(skel->progs._setsockopt, cgroup_fd);
+	if (CHECK(IS_ERR(skel->links._setsockopt),
+			 "setsockopt_attach", "err: %ld\n",
+			 PTR_ERR(skel->links._setsockopt)))
+		goto cleanup;
+
+	skel->links._getsockopt =
+		bpf_program__attach_cgroup(skel->progs._getsockopt, cgroup_fd);
+	if (CHECK(IS_ERR(skel->links._getsockopt),
+			 "getsockopt_attach", "err: %ld\n",
+			 PTR_ERR(skel->links._getsockopt)))
+		goto cleanup;
 
 	CHECK_FAIL(getsetsockopt());
 
-close_bpf_object:
-	bpf_object__close(obj);
+cleanup:
+	sockopt_sk__destroy(skel);
 }
 
 void test_sockopt_sk(void)
-- 
2.29.2