From: Geliang Tang <tanggeliang@kylinos.cn>

This patch adds two more test addresses ADDR_3 and ADDR_4, and adds a new
parameter "subflows" for endpoint_init() to control how many subflows are
used for the tests. This makes it more flexible.

Update the parameters of endpoint_init() in test_subflow().

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 .../testing/selftests/bpf/prog_tests/mptcp.c  | 25 ++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
index a3e68bc6afa3..b5fdb6dc36e0 100644
--- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
+++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
@@ -20,6 +20,8 @@
 #define NS_TEST "mptcp_ns"
 #define ADDR_1	"10.0.1.1"
 #define ADDR_2	"10.0.1.2"
+#define ADDR_3	"10.0.1.3"
+#define ADDR_4	"10.0.1.4"
 #define PORT_1	10001
 #define WITH_DATA	true
 #define WITHOUT_DATA	false
@@ -351,19 +353,36 @@ static void test_mptcpify(void)
 	close(cgroup_fd);
 }
 
-static int endpoint_init(char *flags)
+static int endpoint_init(char *flags, int subflows)
 {
+	if (subflows > 4)
+		goto fail;
+
 	SYS(fail, "ip -net %s link add veth1 type veth peer name veth2", NS_TEST);
 	SYS(fail, "ip -net %s addr add %s/24 dev veth1", NS_TEST, ADDR_1);
 	SYS(fail, "ip -net %s link set dev veth1 up", NS_TEST);
 	SYS(fail, "ip -net %s addr add %s/24 dev veth2", NS_TEST, ADDR_2);
 	SYS(fail, "ip -net %s link set dev veth2 up", NS_TEST);
-	if (SYS_NOFAIL("ip -net %s mptcp endpoint add %s %s", NS_TEST, ADDR_2, flags)) {
+
+	SYS(fail, "ip -net %s link add veth3 type veth peer name veth4", NS_TEST);
+	SYS(fail, "ip -net %s addr add %s/24 dev veth3", NS_TEST, ADDR_3);
+	SYS(fail, "ip -net %s link set dev veth3 up", NS_TEST);
+	SYS(fail, "ip -net %s addr add %s/24 dev veth4", NS_TEST, ADDR_4);
+	SYS(fail, "ip -net %s link set dev veth4 up", NS_TEST);
+
+	if (SYS_NOFAIL("ip -net %s mptcp limits set subflows 4", NS_TEST)) {
 		printf("'ip mptcp' not supported, skip this test.\n");
 		test__skip();
 		goto fail;
 	}
 
+	if (subflows > 1)
+		SYS_NOFAIL("ip -net %s mptcp endpoint add %s %s", NS_TEST, ADDR_2, flags);
+	if (subflows > 2)
+		SYS_NOFAIL("ip -net %s mptcp endpoint add %s %s", NS_TEST, ADDR_3, flags);
+	if (subflows > 3)
+		SYS_NOFAIL("ip -net %s mptcp endpoint add %s %s", NS_TEST, ADDR_4, flags);
+
 	return 0;
 fail:
 	return -1;
@@ -452,7 +471,7 @@ static void test_subflow(void)
 	if (!ASSERT_OK_PTR(nstoken, "create_netns: mptcp_subflow"))
 		goto skel_destroy;
 
-	if (endpoint_init("subflow") < 0)
+	if (endpoint_init("subflow", 2) < 0)
 		goto close_netns;
 
 	link = bpf_program__attach_cgroup(skel->progs._getsockopt_subflow,
-- 
2.43.0