VIRTNET_RX_PAD
header_offset = VIRTNET_RX_PAD + xdp_headroom;
unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom;
header_offset = VIRTNET_RX_PAD + xdp_headroom;
xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len,
buf -= VIRTNET_RX_PAD + xdp_headroom;
int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom;
buf += VIRTNET_RX_PAD + xdp_headroom;