selftests: net: add flag to force zerocopy mode in xdp_helper

This commit adds an optional -z flag to xdp_helper. When this flag is
provided, the XDP socket binding is forced to be in zerocopy mode.

Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://patch.msgid.link/20250425071018.36078-3-minhquangbui99@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/lib/xdp_helper.c

@@ -17,6 +17,12 @@
 #define NUM_DESC (UMEM_SZ / 2048)
 
 
+static void print_usage(const char *bin)
+{
+	fprintf(stderr, "Usage: %s ifindex queue_id [-z]\n\n"
+		"where:\n\t-z: force zerocopy mode", bin);
+}
+
 /* this is a simple helper program that creates an XDP socket and does the
  * minimum necessary to get bind() to succeed.
  *
@@ -36,8 +42,8 @@ int main(int argc, char **argv)
 	int sock_fd;
 	int queue;
 
-	if (argc != 3) {
-		fprintf(stderr, "Usage: %s ifindex queue_id\n", argv[0]);
+	if (argc != 3 && argc != 4) {
+		print_usage(argv[0]);
 		return 1;
 	}
 
@@ -87,6 +93,15 @@ int main(int argc, char **argv)
 	sxdp.sxdp_queue_id = queue;
 	sxdp.sxdp_flags = 0;
 
+	if (argc > 3) {
+		if (!strcmp(argv[3], "-z")) {
+			sxdp.sxdp_flags = XDP_ZEROCOPY;
+		} else {
+			print_usage(argv[0]);
+			return 1;
+		}
+	}
+
 	if (bind(sock_fd, (struct sockaddr *)&sxdp, sizeof(sxdp)) != 0) {
 		munmap(umem_area, UMEM_SZ);
 		perror("bind failed");