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

Bui Quang Minh
2025-04-17T07:29:39Z

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