ACE_TX_RING_ENTRIES
ap->last_tx = ACE_TX_RING_ENTRIES(ap) - 1;
info->tx_ctrl.max_len = ACE_TX_RING_ENTRIES(ap);
idx = (idx + 1) % ACE_TX_RING_ENTRIES(ap);
for (i = 0; i < ACE_TX_RING_ENTRIES(ap); i++) {
idx = (idx + 1) % ACE_TX_RING_ENTRIES(ap);
idx = (idx + 1) % ACE_TX_RING_ENTRIES(ap);
idx = (idx + 1) % ACE_TX_RING_ENTRIES(ap);
return (csm - prd - 1) & (ACE_TX_RING_ENTRIES(ap) - 1);