RTW_TX_QUEUE_BK
rtw_pci_tx_isr(rtwdev, rtwpci, RTW_TX_QUEUE_BK);
[RTW_TX_QUEUE_BK] = RTK_PCI_TXBD_IDX_BKQ,
len = rtwpci->tx_rings[RTW_TX_QUEUE_BK].r.len;
dma = rtwpci->tx_rings[RTW_TX_QUEUE_BK].r.dma;
rtwpci->tx_rings[RTW_TX_QUEUE_BK].r.rp = 0;
rtwpci->tx_rings[RTW_TX_QUEUE_BK].r.wp = 0;
case RTW_TX_QUEUE_BK:
case RTW_TX_QUEUE_BK:
case RTW_TX_QUEUE_BK:
[IEEE80211_AC_BK] = RTW_TX_QUEUE_BK,