DESC_WRAP
mod->fastrx_num = (desc.control & DESC_WRAP) ? 0
mod->fasttx_num = (desc.control & DESC_WRAP) ? 0
desc.control |= DESC_WRAP;
desc.control |= DESC_WRAP;
desc.control = DESC_VALID | DESC_WRAP | DESC_LEN(1); /* VW L=1 */
desc.control = DESC_VALID | DESC_WRAP | DESC_LEN(1); /* VW L=1 */
desc.control |= DESC_WRAP;
desc.control |= DESC_WRAP;
mod->tx_num = (desc.control & DESC_WRAP) ? 0 : (mod->tx_num + 1);
mod->rx_num = (desc.control & DESC_WRAP) ? 0 : (mod->rx_num + 1);