RTW_NTXDESCLO
&sc->sc_descs->hd_txlo[0], RTW_NTXDESCLO,
{RTW_NTXDESCLO, RTW_NTXDESCMD, RTW_NTXDESCHI,
#define RTW_NTXDESCTOTAL (RTW_NTXDESCLO + RTW_NTXDESCMD + \
struct rtw_txdesc hd_txlo[RTW_NTXDESCLO];