aq_txc_desc_t
.isc_nrxd_default = {PAGE_SIZE / sizeof(aq_txc_desc_t) * 4},
.isc_ntxd_default = {PAGE_SIZE / sizeof(aq_txc_desc_t) * 4},
aq_txc_desc_t *txc)
aq_txc_desc_t *txc;
txc = (aq_txc_desc_t *)&ring->tx_descs[pidx];