[PATCH v5 2/3] selftests: net: add flag to force zerocopy mode in xdp_helper

[Bui Quang Minh]

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 <minhquangbu...@gmail.com>
---
 tools/testing/selftests/net/lib/xdp_helper.c | 19 +++++++++++++++++--
 1 file changed, 17 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..f21536ab95ba 100644
--- a/tools/testing/selftests/net/lib/xdp_helper.c
+++ b/tools/testing/selftests/net/lib/xdp_helper.c
@@ -62,6 +62,12 @@ static void ksft_wait(void)
                close(fd);
 }
 
+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.
  *
@@ -81,8 +87,8 @@ 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;
        }
 
@@ -132,6 +138,15 @@ 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");
-- 
2.43.0