linux-kernel - [PATCH bpf-next v2 2/2] selftests/bpf: Tests libbpf autoattach APIs

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Date:   Tue, 16 Aug 2022 16:40:12 -0700
From:   Hao Luo <haoluo@...gle.com>
To:     linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        Jiri Olsa <jolsa@...nel.org>, KP Singh <kpsingh@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        Hao Luo <haoluo@...gle.com>
Subject: [PATCH bpf-next v2 2/2] selftests/bpf: Tests libbpf autoattach APIs

Adds test for libbpf APIs that toggle bpf program auto-attaching.

Signed-off-by: Hao Luo <haoluo@...gle.com>
---
 .../selftests/bpf/prog_tests/autoattach.c     | 30 +++++++++++++++++++
 .../selftests/bpf/progs/test_autoattach.c     | 23 ++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/autoattach.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_autoattach.c

diff --git a/tools/testing/selftests/bpf/prog_tests/autoattach.c b/tools/testing/selftests/bpf/prog_tests/autoattach.c
new file mode 100644
index 000000000000..b34b5945d297
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/autoattach.c
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Google */
+
+#include <test_progs.h>
+#include "test_autoattach.skel.h"
+
+void test_autoattach(void)
+{
+	struct test_autoattach* skel;
+
+	skel = test_autoattach__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
+		goto cleanup;
+
+	/* disable auto-attach for prog2 */
+	bpf_program__set_autoattach(skel->progs.prog2, false);
+	ASSERT_TRUE(bpf_program__autoattach(skel->progs.prog1), "autoattach_prog1");
+	ASSERT_FALSE(bpf_program__autoattach(skel->progs.prog2), "autoattach_prog2");
+	if (!ASSERT_OK(test_autoattach__attach(skel), "skel_attach"))
+		goto cleanup;
+
+	usleep(1);
+
+	ASSERT_TRUE(skel->bss->prog1_called, "attached_prog1");
+	ASSERT_FALSE(skel->bss->prog2_called, "attached_prog2");
+
+cleanup:
+	test_autoattach__destroy(skel);
+}
+
diff --git a/tools/testing/selftests/bpf/progs/test_autoattach.c b/tools/testing/selftests/bpf/progs/test_autoattach.c
new file mode 100644
index 000000000000..11a44493ebce
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_autoattach.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Google */
+
+#include "vmlinux.h"
+#include <bpf/bpf_tracing.h>
+
+bool prog1_called = false;
+bool prog2_called = false;
+
+SEC("raw_tp/sys_enter")
+int prog1(const void *ctx)
+{
+	prog1_called = true;
+	return 0;
+}
+
+SEC("raw_tp/sys_exit")
+int prog2(const void *ctx)
+{
+	prog2_called = true;
+	return 0;
+}
+
-- 
2.37.1.595.g718a3a8f04-goog