[PATCH v4 3/4] selftests: net: add flag to force zerocopy mode in xdp_helper

[Bui Quang Minh <minhquangbui99@gmail.com>]

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>
---
 tools/testing/selftests/net/lib/xdp_helper.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/lib/xdp_helper.c b/tools/testing/selftests/net/lib/xdp_helper.c
index aeed25914104..6afd77bfbe8b 100644
--- a/tools/testing/selftests/net/lib/xdp_helper.c
+++ b/tools/testing/selftests/net/lib/xdp_helper.c
@@ -81,8 +81,9 @@ 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) {
+		fprintf(stderr, "Usage: %s ifindex queue_id [-z]\n\n"
+			"where:\n\t-z: force zerocopy mode", argv[0]);
 		return 1;
 	}
 
@@ -132,6 +133,14 @@ int main(int argc, char **argv)
 	sxdp.sxdp_queue_id = queue;
 	sxdp.sxdp_flags = 0;
 
+	if (argc == 4 && strcmp(argv[3], "-z")) {
+		fprintf(stderr, "Usage: %s ifindex queue_id [-z]\n\n"
+			"where:\n\t-z: force zerocopy mode\n", argv[0]);
+		return 1;
+	} else if (argc == 4) {
+		sxdp.sxdp_flags = XDP_ZEROCOPY;
+	}
+
 	if (bind(sock_fd, (struct sockaddr *)&sxdp, sizeof(sxdp)) != 0) {
 		munmap(umem_area, UMEM_SZ);
 		perror("bind failed");
-- 
2.43.0