[PATCH v6 bpf-next 3/3] bpf: add selftest for BPF_ENABLE_STATS

[Song Liu <songliubraving@fb.com>]

Add test for  BPF_ENABLE_STATS, which should enable run_time_ns stats.

~/selftests/bpf# ./test_progs -t enable_stats  -v
test_enable_stats:PASS:skel_open_and_load 0 nsec
test_enable_stats:PASS:get_stats_fd 0 nsec
test_enable_stats:PASS:attach_raw_tp 0 nsec
test_enable_stats:PASS:get_prog_info 0 nsec
test_enable_stats:PASS:check_stats_enabled 0 nsec
Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Song Liu <songliubraving@fb.com>
---
 .../selftests/bpf/prog_tests/enable_stats.c   | 45 +++++++++++++++++++
 .../selftests/bpf/progs/test_enable_stats.c   | 21 +++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/enable_stats.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_enable_stats.c

diff --git a/tools/testing/selftests/bpf/prog_tests/enable_stats.c b/tools/testing/selftests/bpf/prog_tests/enable_stats.c
new file mode 100644
index 000000000000..987fc743ab75
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/enable_stats.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include <sys/mman.h>
+#include "test_enable_stats.skel.h"
+
+void test_enable_stats(void)
+{
+	struct test_enable_stats *skel;
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
+	int stats_fd, err, prog_fd;
+	int duration = 0;
+
+	skel = test_enable_stats__open_and_load();
+
+	if (CHECK(!skel, "skel_open_and_load", "skeleton open/load failed\n"))
+		return;
+
+	stats_fd = bpf_enable_stats(BPF_STATS_RUNTIME_CNT);
+
+	if (CHECK(stats_fd < 0, "get_stats_fd", "failed %d\n", errno))
+		goto cleanup;
+
+	err = test_enable_stats__attach(skel);
+
+	if (CHECK(err, "attach_raw_tp", "err %d\n", err))
+		goto cleanup;
+
+	usleep(1000);
+
+	prog_fd = bpf_program__fd(skel->progs.test_enable_stats);
+	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+
+	if (CHECK(err, "get_prog_info",
+		  "failed to get bpf_prog_info for fd %d\n", prog_fd))
+		goto cleanup;
+
+	CHECK(info.run_time_ns == 0, "check_stats_enabled",
+	      "failed to enable run_time_ns stats\n");
+
+cleanup:
+	test_enable_stats__destroy(skel);
+	if (stats_fd >= 0)
+		close(stats_fd);
+}
diff --git a/tools/testing/selftests/bpf/progs/test_enable_stats.c b/tools/testing/selftests/bpf/progs/test_enable_stats.c
new file mode 100644
index 000000000000..aa9626330a9e
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_enable_stats.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Facebook
+
+#include <linux/bpf.h>
+#include <stdint.h>
+#include <bpf/bpf_helpers.h>
+
+char _license[] SEC("license") = "GPL";
+
+static int val = 1;
+
+SEC("raw_tracepoint/sys_enter")
+int test_enable_stats(void *ctx)
+{
+	__u32 key = 0;
+	__u64 *val;
+
+	val += 1;
+
+	return 0;
+}
-- 
2.24.1