DGE_NTXDESC
if (sc->sc_txfree != DGE_NTXDESC) {
#define DGE_NTXDESC_MASK (DGE_NTXDESC - 1)
DGE_CDTXSYNC(sc, 0, DGE_NTXDESC,
sc->sc_txfree = DGE_NTXDESC;
struct dge_tdes wcd_txdescs[DGE_NTXDESC];
if ((__x + __n) > DGE_NTXDESC) { \
(DGE_NTXDESC - __x), (ops)); \
__n -= (DGE_NTXDESC - __x); \