From: Geliang Tang <tanggeliang@kylinos.cn>

This patch defines MPTCP_SCHED_TEST macro, a template for all scheduler
tests. Every scheduler is identified by argument name, and use sysctl
to set net.mptcp.scheduler as "bpf_name" to use this sched. Add two
veth net devices to simulate the multiple addresses case. Use 'ip mptcp
endpoint' command to add the new endpoint ADDR2 to PM netlink. Arguments
addr1/add2 means whether the data has been sent on the first/second subflow
or not. Send data and check bytes_sent of 'ss' output after it using
send_data_and_verify().

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 .../testing/selftests/bpf/prog_tests/mptcp.c  | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
index 1268479281fc..dd625ff0e234 100644
--- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
+++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
@@ -508,6 +508,36 @@ static void test_default(void)
 	cleanup_netns(nstoken);
 }
 
+#define MPTCP_SCHED_TEST(name, addr1, addr2)			\
+static void test_##name(void)					\
+{								\
+	struct mptcp_bpf_##name *skel;				\
+	struct nstoken *nstoken;				\
+	struct bpf_link *link;					\
+	struct bpf_map *map;					\
+								\
+	skel = mptcp_bpf_##name##__open_and_load();		\
+	if (!ASSERT_OK_PTR(skel, "open_and_load " #name))	\
+		return;						\
+								\
+	map = bpf_object__find_map_by_name(skel->obj, #name);	\
+	link = bpf_map__attach_struct_ops(map);			\
+	if (!ASSERT_OK_PTR(link, "attach_struct_ops " #name))	\
+		goto skel_destroy;				\
+								\
+	nstoken = sched_init("subflow", "bpf_" #name);		\
+	if (!ASSERT_OK_PTR(nstoken, "sched_init " #name))	\
+		goto link_destroy;				\
+								\
+	send_data_and_verify(#name, atoi(#addr1), atoi(#addr2));\
+								\
+	cleanup_netns(nstoken);					\
+link_destroy:							\
+	bpf_link__destroy(link);				\
+skel_destroy:							\
+	mptcp_bpf_##name##__destroy(skel);			\
+}
+
 static void test_first(void)
 {
 	struct mptcp_bpf_first *first_skel;
-- 
2.40.1