[PATCH 16/19] selftests/bpf: Add fentry multi func test

Jiri Olsa
2021-06-05T11:11:38Z

Adding selftest for fentry multi func test that attaches
to bpf_fentry_test* functions and checks argument values
based on the processed function.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/testing/selftests/bpf/multi_check.h | 52 +++++++++++++++++++
.../bpf/prog_tests/fentry_multi_test.c | 43 +++++++++++++++
.../selftests/bpf/progs/fentry_multi_test.c | 18 +++++++
3 files changed, 113 insertions(+)
create mode 100644 tools/testing/selftests/bpf/multi_check.h
create mode 100644 tools/testing/selftests/bpf/prog_tests/fentry_multi_test.c
create mode 100644 tools/testing/selftests/bpf/progs/fentry_multi_test.c

diff --git a/tools/testing/selftests/bpf/multi_check.h b/tools/testing/selftests/bpf/multi_check.h
new file mode 100644
index 000000000000..36c2a93f9be3
--- /dev/null
+++ b/tools/testing/selftests/bpf/multi_check.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __MULTI_CHECK_H
+#define __MULTI_CHECK_H
+
+extern unsigned long long bpf_fentry_test[8];
+
+static __attribute__((unused)) inline
+void multi_arg_check(unsigned long ip, __u64 a, __u64 b, __u64 c, __u64 d, __u64 e, __u64 f, __u64 *test_result)
+{
+ if (ip == bpf_fentry_test[0]) {
+ *test_result += (int) a == 1;
+ } else if (ip == bpf_fentry_test[1]) {
+ *test_result += (int) a == 2 && (__u64) b == 3;
+ } else if (ip == bpf_fentry_test[2]) {
+ *test_result += (char) a == 4 && (int) b == 5 && (__u64) c == 6;
+ } else if (ip == bpf_fentry_test[3]) {
+ *test_result += (void *) a == (void *) 7 && (char) b == 8 && (int) c == 9 && (__u64) d == 10;
+ } else if (ip == bpf_fentry_test[4]) {
+ *test_result += (__u64) a == 11 && (void *) b == (void *) 12 && (short) c == 13 && (int) d == 14 && (__u64) e == 15;
+ } else if (ip == bpf_fentry_test[5]) {
+ *test_result += (__u64) a == 16 && (void *) b == (void *) 17 && (short) c == 18 && (int) d == 19 && (void *) e == (void *) 20 && (__u64) f == 21;
+ } else if (ip == bpf_fentry_test[6]) {
+ *test_result += 1;
+ } else if (ip == bpf_fentry_test[7]) {
+ *test_result += 1;
+ }
+}
+
+static __attribute__((unused)) inline
+void multi_ret_check(unsigned long ip, int ret, __u64 *test_result)
+{
+ if (ip == bpf_fentry_test[0]) {
+ *test_result += ret == 2;
+ } else if (ip == bpf_fentry_test[1]) {
+ *test_result += ret == 5;
+ } else if (ip == bpf_fentry_test[2]) {
+ *test_result += ret == 15;
+ } else if (ip == bpf_fentry_test[3]) {
+ *test_result += ret == 34;
+ } else if (ip == bpf_fentry_test[4]) {
+ *test_result += ret == 65;
+ } else if (ip == bpf_fentry_test[5]) {
+ *test_result += ret == 111;
+ } else if (ip == bpf_fentry_test[6]) {
+ *test_result += ret == 0;
+ } else if (ip == bpf_fentry_test[7]) {
+ *test_result += ret == 0;
+ }
+}
+
+#endif /* __MULTI_CHECK_H */
diff --git a/tools/testing/selftests/bpf/prog_tests/fentry_multi_test.c b/tools/testing/selftests/bpf/prog_tests/fentry_multi_test.c
new file mode 100644
index 000000000000..e4a8089533d6
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/fentry_multi_test.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include "fentry_multi_test.skel.h"
+#include "trace_helpers.h"
+
+void test_fentry_multi_test(void)
+{
+ struct fentry_multi_test *skel = NULL;
+ unsigned long long *bpf_fentry_test;
+ __u32 duration = 0, retval;
+ int err, prog_fd;
+
+ skel = fentry_multi_test__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "fentry_multi_skel_load"))
+ goto cleanup;
+
+ bpf_fentry_test = &skel->bss->bpf_fentry_test[0];
+ ASSERT_OK(kallsyms_find("bpf_fentry_test1", &bpf_fentry_test[0]), "kallsyms_find");
+ ASSERT_OK(kallsyms_find("bpf_fentry_test2", &bpf_fentry_test[1]), "kallsyms_find");
+ ASSERT_OK(kallsyms_find("bpf_fentry_test3", &bpf_fentry_test[2]), "kallsyms_find");
+ ASSERT_OK(kallsyms_find("bpf_fentry_test4", &bpf_fentry_test[3]), "kallsyms_find");
+ ASSERT_OK(kallsyms_find("bpf_fentry_test5", &bpf_fentry_test[4]), "kallsyms_find");
+ ASSERT_OK(kallsyms_find("bpf_fentry_test6", &bpf_fentry_test[5]), "kallsyms_find");
+ ASSERT_OK(kallsyms_find("bpf_fentry_test7", &bpf_fentry_test[6]), "kallsyms_find");
+ ASSERT_OK(kallsyms_find("bpf_fentry_test8", &bpf_fentry_test[7]), "kallsyms_find");
+
+ err = fentry_multi_test__attach(skel);
+ if (!ASSERT_OK(err, "fentry_attach"))
+ goto cleanup;
+
+ prog_fd = bpf_program__fd(skel->progs.test);
+ err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
+ NULL, NULL, &retval, &duration);
+ ASSERT_OK(err, "test_run");
+ ASSERT_EQ(retval, 0, "test_run");
+
+ ASSERT_EQ(skel->bss->test_result, 8, "test_result");
+
+ fentry_multi_test__detach(skel);
+
+cleanup:
+ fentry_multi_test__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/fentry_multi_test.c b/tools/testing/selftests/bpf/progs/fentry_multi_test.c
new file mode 100644
index 000000000000..a443fc958e5a
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/fentry_multi_test.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include "multi_check.h"
+
+char _license[] SEC("license") = "GPL";
+
+unsigned long long bpf_fentry_test[8];
+
+__u64 test_result = 0;
+
+SEC("fentry.multi/bpf_fentry_test*")
+int BPF_PROG(test, unsigned long ip, __u64 a, __u64 b, __u64 c, __u64 d, __u64 e, __u64 f)
+{
+ multi_arg_check(ip, a, b, c, d, e, f, &test_result);
+ return 0;
+}
--
2.31.1