linux-kernel - [PATCH bpf-next v10 01/23] selftests/bpf: regroup and declare similar kfuncs selftests in an array

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Date:   Fri,  2 Sep 2022 15:29:16 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Jiri Kosina <jikos@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Joe Stringer <joe@...ium.io>, Jonathan Corbet <corbet@....net>
Cc:     Tero Kristo <tero.kristo@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-doc@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH bpf-next v10 01/23] selftests/bpf: regroup and declare similar kfuncs selftests in an array

Similar to tools/testing/selftests/bpf/prog_tests/dynptr.c:
we declare an array of tests that we run one by one in a for loop.

Followup patches will add more similar-ish tests, so avoid a lot of copy
paste by grouping the declaration in an array.

To be able to call bpf_object__find_program_by_name(), we need to use
plain libbpf calls, and not light skeletons. So also change the Makefile
to not generate light skeletons.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

---

new in v10
---
 tools/testing/selftests/bpf/Makefile          |  2 +-
 .../selftests/bpf/prog_tests/kfunc_call.c     | 56 +++++++++++++------
 2 files changed, 39 insertions(+), 19 deletions(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index eecad99f1735..b19b0b35aec8 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -351,7 +351,7 @@ LINKED_SKELS := test_static_linked.skel.h linked_funcs.skel.h		\
 		test_subskeleton.skel.h test_subskeleton_lib.skel.h	\
 		test_usdt.skel.h
 
-LSKELS := kfunc_call_test.c fentry_test.c fexit_test.c fexit_sleep.c \
+LSKELS := fentry_test.c fexit_test.c fexit_sleep.c \
 	test_ringbuf.c atomics.c trace_printk.c trace_vprintk.c \
 	map_ptr_kern.c core_kern.c core_kern_overflow.c
 # Generate both light skeleton and libbpf skeleton for these
diff --git a/tools/testing/selftests/bpf/prog_tests/kfunc_call.c b/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
index eede7c304f86..21e347f46c93 100644
--- a/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
+++ b/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
@@ -2,16 +2,28 @@
 /* Copyright (c) 2021 Facebook */
 #include <test_progs.h>
 #include <network_helpers.h>
-#include "kfunc_call_test.lskel.h"
+#include "kfunc_call_test.skel.h"
 #include "kfunc_call_test_subprog.skel.h"
 #include "kfunc_call_test_subprog.lskel.h"
 #include "kfunc_call_destructive.skel.h"
 
 #include "cap_helpers.h"
 
-static void test_main(void)
+struct kfunc_test_params {
+	const char *prog_name;
+	int retval;
+};
+
+static struct kfunc_test_params kfunc_tests[] = {
+	{"kfunc_call_test1", 12},
+	{"kfunc_call_test2", 3},
+	{"kfunc_call_test_ref_btf_id", 0},
+};
+
+static void verify_success(struct kfunc_test_params *param)
 {
-	struct kfunc_call_test_lskel *skel;
+	struct kfunc_call_test *skel;
+	struct bpf_program *prog;
 	int prog_fd, err;
 	LIBBPF_OPTS(bpf_test_run_opts, topts,
 		.data_in = &pkt_v4,
@@ -19,26 +31,35 @@ static void test_main(void)
 		.repeat = 1,
 	);
 
-	skel = kfunc_call_test_lskel__open_and_load();
+	skel = kfunc_call_test__open_and_load();
 	if (!ASSERT_OK_PTR(skel, "skel"))
 		return;
 
-	prog_fd = skel->progs.kfunc_call_test1.prog_fd;
-	err = bpf_prog_test_run_opts(prog_fd, &topts);
-	ASSERT_OK(err, "bpf_prog_test_run(test1)");
-	ASSERT_EQ(topts.retval, 12, "test1-retval");
+	prog = bpf_object__find_program_by_name(skel->obj, param->prog_name);
+	if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
+		goto cleanup;
 
-	prog_fd = skel->progs.kfunc_call_test2.prog_fd;
+	prog_fd = bpf_program__fd(prog);
 	err = bpf_prog_test_run_opts(prog_fd, &topts);
-	ASSERT_OK(err, "bpf_prog_test_run(test2)");
-	ASSERT_EQ(topts.retval, 3, "test2-retval");
+	if (!ASSERT_OK(err, param->prog_name))
+		goto cleanup;
 
-	prog_fd = skel->progs.kfunc_call_test_ref_btf_id.prog_fd;
-	err = bpf_prog_test_run_opts(prog_fd, &topts);
-	ASSERT_OK(err, "bpf_prog_test_run(test_ref_btf_id)");
-	ASSERT_EQ(topts.retval, 0, "test_ref_btf_id-retval");
+	ASSERT_EQ(topts.retval, param->retval, "retval");
+
+cleanup:
+	kfunc_call_test__destroy(skel);
+}
+
+static void test_main(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(kfunc_tests); i++) {
+		if (!test__start_subtest(kfunc_tests[i].prog_name))
+			continue;
 
-	kfunc_call_test_lskel__destroy(skel);
+		verify_success(&kfunc_tests[i]);
+	}
 }
 
 static void test_subprog(void)
@@ -121,8 +142,7 @@ static void test_destructive(void)
 
 void test_kfunc_call(void)
 {
-	if (test__start_subtest("main"))
-		test_main();
+	test_main();
 
 	if (test__start_subtest("subprog"))
 		test_subprog();
-- 
2.36.1