Support 3-tuple filtering by making client_ip optional. When -c is
not passed, don't specify src-ip/src-port in the filter.

Reviewed-by: Mina Almasry <almasrymina@google.com>
Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
---
 tools/testing/selftests/net/ncdevmem.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/net/ncdevmem.c b/tools/testing/selftests/net/ncdevmem.c
index b89b62445158..b94f7c4a53ed 100644
--- a/tools/testing/selftests/net/ncdevmem.c
+++ b/tools/testing/selftests/net/ncdevmem.c
@@ -62,7 +62,7 @@
  */
 
 static char *server_ip = "192.168.1.4";
-static char *client_ip = "192.168.1.2";
+static char *client_ip;
 static char *port = "5201";
 static size_t do_validation;
 static int start_queue = 8;
@@ -236,8 +236,14 @@ static int configure_channels(unsigned int rx, unsigned int tx)
 
 static int configure_flow_steering(void)
 {
-	return run_command("sudo ethtool -N %s flow-type tcp4 src-ip %s dst-ip %s src-port %s dst-port %s queue %d >&2",
-			   ifname, client_ip, server_ip, port, port, start_queue);
+	return run_command("sudo ethtool -N %s flow-type tcp4 %s %s dst-ip %s %s %s dst-port %s queue %d >&2",
+			   ifname,
+			   client_ip ? "src-ip" : "",
+			   client_ip ?: "",
+			   server_ip,
+			   client_ip ? "src-port" : "",
+			   client_ip ? port : "",
+			   port, start_queue);
 }
 
 static int bind_rx_queue(unsigned int ifindex, unsigned int dmabuf_fd,
-- 
2.47.0