RT2573_TX_DESC_SIZE
data->buf + RT2573_TX_DESC_SIZE);
xferlen = RT2573_TX_DESC_SIZE + mprot->m_pkthdr.len;
m_copydata(m0, 0, m0->m_pkthdr.len, data->buf + RT2573_TX_DESC_SIZE);
xferlen = (RT2573_TX_DESC_SIZE + m0->m_pkthdr.len + 3) & ~3;
(size_t)m0->m_pkthdr.len + RT2573_TX_DESC_SIZE,
RT2573_TX_DESC_SIZE + IEEE80211_MAX_LEN,
memset(data->buf, 0, RT2573_TX_DESC_SIZE);