NXE_TXD_DESCS
if (nxe_ring_writeable(nr, sc->sc_cmd_consumer_cur) < NXE_TXD_DESCS) {
} while (nr->nr_ready >= NXE_TXD_DESCS);
#define NXE_TXD_MAX_SEGS (NXE_TXD_SEGS * NXE_TXD_DESCS)