[PATCH bpf-next v4 23/27] selftests/bpf: Add fexit multi func test

[Jiri Olsa <jolsa@redhat.com>]

Adding selftest for fexit 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/Makefile          |  3 +-
 .../bpf/prog_tests/multi_fexit_test.c         | 31 +++++++++++++++++++
 .../testing/selftests/bpf/progs/multi_check.c | 22 +++++++++++++
 .../testing/selftests/bpf/progs/multi_fexit.c | 20 ++++++++++++
 4 files changed, 75 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/multi_fexit_test.c
 create mode 100644 tools/testing/selftests/bpf/progs/multi_fexit.c

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 013d41c8edae..8da3be0972de 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -313,7 +313,7 @@ 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_fentry_test.skel.h multi_fexit_test.skel.h
 
 LSKELS := kfunc_call_test.c fentry_test.c fexit_test.c fexit_sleep.c \
 	test_ksyms_module.c test_ringbuf.c atomics.c trace_printk.c
@@ -324,6 +324,7 @@ linked_funcs.skel.h-deps := linked_funcs1.o linked_funcs2.o
 linked_vars.skel.h-deps := linked_vars1.o linked_vars2.o
 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
 
 LINKED_BPF_SRCS := $(patsubst %.o,%.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
 
diff --git a/tools/testing/selftests/bpf/prog_tests/multi_fexit_test.c b/tools/testing/selftests/bpf/prog_tests/multi_fexit_test.c
new file mode 100644
index 000000000000..d9b0eedd9f45
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/multi_fexit_test.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include "multi_fexit_test.skel.h"
+#include "trace_helpers.h"
+
+void test_multi_fexit_test(void)
+{
+	struct multi_fexit_test *skel = NULL;
+	__u32 duration = 0, retval;
+	int err, prog_fd;
+
+	skel = multi_fexit_test__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "fexit_multi_skel_load"))
+		goto cleanup;
+
+	err = multi_fexit_test__attach(skel);
+	if (!ASSERT_OK(err, "fexit_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_arg_result, 8, "fexit_multi_arg_result");
+	ASSERT_EQ(skel->bss->test_ret_result, 8, "fexit_multi_ret_result");
+
+cleanup:
+	multi_fexit_test__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/multi_check.c b/tools/testing/selftests/bpf/progs/multi_check.c
index 415c96684a30..80ebbefaa8cd 100644
--- a/tools/testing/selftests/bpf/progs/multi_check.c
+++ b/tools/testing/selftests/bpf/progs/multi_check.c
@@ -61,3 +61,25 @@ void multi_arg_check(__u64 *ctx, __u64 *test_result)
 		*test_result += 1;
 	}
 }
+
+void multi_ret_check(void *ctx, int ret, __u64 *test_result)
+{
+	void *ip = (void *) bpf_get_func_ip(ctx);
+
+	if (ip == &bpf_fentry_test1)
+		*test_result += ret == 2;
+	else if (ip == &bpf_fentry_test2)
+		*test_result += ret == 5;
+	else if (ip == &bpf_fentry_test3)
+		*test_result += ret == 15;
+	else if (ip == &bpf_fentry_test4)
+		*test_result += ret == 34;
+	else if (ip == &bpf_fentry_test5)
+		*test_result += ret == 65;
+	else if (ip == &bpf_fentry_test6)
+		*test_result += ret == 111;
+	else if (ip == &bpf_fentry_test7)
+		*test_result += ret == 0;
+	else if (ip == &bpf_fentry_test8)
+		*test_result += ret == 0;
+}
diff --git a/tools/testing/selftests/bpf/progs/multi_fexit.c b/tools/testing/selftests/bpf/progs/multi_fexit.c
new file mode 100644
index 000000000000..29c49aa3bfc2
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/multi_fexit.c
@@ -0,0 +1,20 @@
+// 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, int ret, __u64 *test_result);
+
+__u64 test_arg_result = 0;
+__u64 test_ret_result = 0;
+
+SEC("fexit.multi/bpf_fentry_test*")
+int BPF_PROG(test, __u64 a, __u64 b, __u64 c, __u64 d, __u64 e, __u64 f, int ret)
+{
+	multi_arg_check(ctx, &test_arg_result);
+	multi_ret_check(ctx, ret, &test_ret_result);
+	return 0;
+}
-- 
2.31.1