virtnet_get_headroom
if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) {
xdp_headroom = virtnet_get_headroom(vi);
if (likely(headroom >= virtnet_get_headroom(vi) &&
unsigned int xdp_headroom = virtnet_get_headroom(vi);
unsigned int headroom = virtnet_get_headroom(vi);
unsigned int headroom = virtnet_get_headroom(vi);