Squash to "selftests/bpf: Add mptcp subflow subtest"

Drop ss_search() from run_subflow().

Use the "cgroup/getsockopt" way to inspect the subflows.

Signed-off-by: Geliang Tang <[email protected]>

Author: Geliang Tang

tools/testing/selftests/bpf/prog_tests/mptcp.c

@@ -368,21 +368,29 @@ static int endpoint_init(char *flags)
 	return -1;
 }
 
-static int _ss_search(char *src, char *dst, char *port, char *keyword)
+static void wait_for_new_subflows(int fd)
 {
-	return SYS_NOFAIL("ip netns exec %s ss -enita src %s dst %s %s %d | grep -q '%s'",
-			  NS_TEST, src, dst, port, PORT_1, keyword);
-}
+	socklen_t len;
+	u8 subflows;
+	int err, i;
 
-static int ss_search(char *src, char *keyword)
-{
-	return _ss_search(src, ADDR_1, "dport", keyword);
+	len = sizeof(subflows);
+	/* Wait max 1 sec for new subflows to be created */
+	for (i = 0; i < 10; i++) {
+		err = getsockopt(fd, SOL_MPTCP, MPTCP_INFO, &subflows, &len);
+		if (!err && subflows > 0)
+			break;
+
+		sleep(0.1);
+	}
 }
 
-static void run_subflow(char *new)
+static void run_subflow(void)
 {
 	int server_fd, client_fd, err;
+	char new[TCP_CA_NAME_MAX];
 	char cc[TCP_CA_NAME_MAX];
+	unsigned int mark;
 	socklen_t len;
 
 	server_fd = start_mptcp_server(AF_INET, ADDR_1, PORT_1, 0);
@@ -393,19 +401,21 @@ static void run_subflow(char *new)
 	if (!ASSERT_GE(client_fd, 0, "connect to fd"))
 		goto close_server;
 
-	len = sizeof(cc);
-	err = getsockopt(server_fd, SOL_TCP, TCP_CONGESTION, cc, &len);
-	if (!ASSERT_OK(err, "getsockopt(server_fd, TCP_CONGESTION)"))
-		goto close_client;
-
 	send_byte(client_fd);
+	wait_for_new_subflows(client_fd);
+
+	len = sizeof(mark);
+	err = getsockopt(client_fd, SOL_SOCKET, SO_MARK, &mark, &len);
+	if (ASSERT_OK(err, "getsockopt(client_fd, SO_MARK)"))
+		ASSERT_EQ(mark, 0, "mark");
+
+	len = sizeof(new);
+	err = getsockopt(client_fd, SOL_TCP, TCP_CONGESTION, new, &len);
+	if (ASSERT_OK(err, "getsockopt(client_fd, TCP_CONGESTION)")) {
+		get_msk_ca_name(cc);
+		ASSERT_STREQ(new, cc, "cc");
+	}
 
-	ASSERT_OK(ss_search(ADDR_1, "fwmark:0x1"), "ss_search fwmark:0x1");
-	ASSERT_OK(ss_search(ADDR_2, "fwmark:0x2"), "ss_search fwmark:0x2");
-	ASSERT_OK(ss_search(ADDR_1, new), "ss_search new cc");
-	ASSERT_OK(ss_search(ADDR_2, cc), "ss_search default cc");
-
-close_client:
 	close(client_fd);
 close_server:
 	close(server_fd);
@@ -416,6 +426,7 @@ static void test_subflow(void)
 	int cgroup_fd, prog_fd, err;
 	struct mptcp_subflow *skel;
 	struct nstoken *nstoken;
+	struct bpf_link *link;
 
 	cgroup_fd = test__join_cgroup("/mptcp_subflow");
 	if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup: mptcp_subflow"))
@@ -441,8 +452,14 @@ static void test_subflow(void)
 	if (endpoint_init("subflow") < 0)
 		goto close_netns;
 
-	run_subflow(skel->data->cc);
+	link = bpf_program__attach_cgroup(skel->progs._getsockopt_subflow,
+					  cgroup_fd);
+	if (!ASSERT_OK_PTR(link, "getsockopt prog"))
+		goto close_netns;
+
+	run_subflow();
 
+	bpf_link__destroy(link);
 close_netns:
 	cleanup_netns(nstoken);
 skel_destroy: