Subject: [PATCH bpf-next 27/29] selftests/bpf: Add mixed multi func test

From: Jiri Olsa <[email-masked]>
Date: Thu, 18 Nov 2021 12:24:53 +0100

Adding selftest for fentry/fexit multi func tests that attaches
to bpf_fentry_test* functions, where some of them have already
attached trampoline.

Signed-off-by: Jiri Olsa <[email-masked]>
---
 tools/testing/selftests/bpf/Makefile          |  3 +-
 .../bpf/prog_tests/multi_mixed_test.c         | 34 +++++++++++++++
 .../testing/selftests/bpf/progs/multi_mixed.c | 43 +++++++++++++++++++
 3 files changed, 79 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/multi_mixed_test.c
 create mode 100644 tools/testing/selftests/bpf/progs/multi_mixed.c

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 236b6e0a36de..48970e983250 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -324,7 +324,7 @@ SKEL_BLACKLIST := btf__% test_pinning_invalid.c test_sk_assign.c
 LINKED_SKELS := test_static_linked.skel.h linked_funcs.skel.h		\
 		linked_vars.skel.h linked_maps.skel.h			\
 		multi_fentry_test.skel.h multi_fexit_test.skel.h	\
-		multi_fentry_fexit_test.skel.h
+		multi_fentry_fexit_test.skel.h multi_mixed_test.skel.h
 
 LSKELS := kfunc_call_test.c fentry_test.c fexit_test.c fexit_sleep.c \
 	test_ringbuf.c atomics.c trace_printk.c trace_vprintk.c
@@ -339,6 +339,7 @@ linked_maps.skel.h-deps := linked_maps1.o linked_maps2.o
 multi_fentry_test.skel.h-deps := multi_fentry.o multi_check.o
 multi_fexit_test.skel.h-deps := multi_fexit.o multi_check.o
 multi_fentry_fexit_test.skel.h-deps := multi_fentry_fexit.o multi_check.o
+multi_mixed_test.skel.h-deps := multi_mixed.o multi_check.o
 
 LINKED_BPF_SRCS := $(patsubst %.o,%.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
 
diff --git a/tools/testing/selftests/bpf/prog_tests/multi_mixed_test.c b/tools/testing/selftests/bpf/prog_tests/multi_mixed_test.c
new file mode 100644
index 000000000000..c9395b4eb5ac
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/multi_mixed_test.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include "multi_mixed_test.skel.h"
+
+void test_multi_mixed_test(void)
+{
+	DECLARE_LIBBPF_OPTS(bpf_link_update_opts, link_upd_opts);
+	struct multi_mixed_test *skel = NULL;
+	__u32 duration = 0, retval;
+	int err, prog_fd;
+
+	skel = multi_mixed_test__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "fentry_multi_skel_load"))
+		goto cleanup;
+
+	err = multi_mixed_test__attach(skel);
+	if (!ASSERT_OK(err, "fentry_attach"))
+		goto cleanup;
+
+	prog_fd = bpf_program__fd(skel->progs.test1);
+	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->test1_result, 1, "test1_result");
+	ASSERT_EQ(skel->bss->test2_result, 1, "test2_result");
+	ASSERT_EQ(skel->bss->test3_arg_result, 8, "test3_arg_result");
+	ASSERT_EQ(skel->bss->test4_arg_result, 8, "test4_arg_result");
+	ASSERT_EQ(skel->bss->test4_ret_result, 8, "test4_ret_result");
+
+cleanup:
+	multi_mixed_test__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/multi_mixed.c b/tools/testing/selftests/bpf/progs/multi_mixed.c
new file mode 100644
index 000000000000..468a044753e9
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/multi_mixed.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+__hidden extern void multi_arg_check(__u64 *ctx, __u64 *test_result);
+__hidden extern void multi_ret_check(void *ctx, __u64 *test_result);
+
+__u64 test1_result = 0;
+SEC("fentry/bpf_fentry_test1")
+int BPF_PROG(test1, int a)
+{
+	test1_result += a == 1;
+	return 0;
+}
+
+__u64 test2_result = 0;
+SEC("fexit/bpf_fentry_test2")
+int BPF_PROG(test2, int a, __u64 b, int ret)
+{
+	test2_result += a == 2 && b == 3;
+	return 0;
+}
+
+__u64 test3_arg_result = 0;
+SEC("fentry.multi/bpf_fentry_test*")
+int BPF_PROG(test3, __u64 a, __u64 b, __u64 c, __u64 d, __u64 e, __u64 f)
+{
+	multi_arg_check(ctx, &test3_arg_result);
+	return 0;
+}
+
+__u64 test4_arg_result = 0;
+__u64 test4_ret_result = 0;
+SEC("fexit.multi/bpf_fentry_test*")
+int BPF_PROG(test4, __u64 a, __u64 b, __u64 c, __u64 d, __u64 e, __u64 f, int ret)
+{
+	multi_arg_check(ctx, &test4_arg_result);
+	multi_ret_check(ctx, &test4_ret_result);
+	return 0;
+}
-- 
2.31.1