RAL_TX_DESC_SIZE
xferlen = (RAL_TX_DESC_SIZE + m0->m_pkthdr.len + 1) & ~1;
m_copydata(m0, 0, m0->m_pkthdr.len, buf + RAL_TX_DESC_SIZE);
m_copydata(m0, 0, m0->m_pkthdr.len, data->buf + RAL_TX_DESC_SIZE);
xferlen = (RAL_TX_DESC_SIZE + m0->m_pkthdr.len + 1) & ~1;
m_copydata(m0, 0, m0->m_pkthdr.len, data->buf + RAL_TX_DESC_SIZE);
xferlen = (RAL_TX_DESC_SIZE + m0->m_pkthdr.len + 1) & ~1;
RAL_TX_DESC_SIZE + MCLBYTES, USBD_FORCE_SHORT_XFER, 0,