msk_tx_desc
struct msk_tx_desc *tx_le;
struct msk_tx_desc *cur_tx;
bzero(rd->msk_tx_ring, sizeof(struct msk_tx_desc) * MSK_TX_RING_CNT);
struct msk_tx_desc *tx_le;
struct msk_tx_desc *msk_tx_ring;
((sc)->msk_rdata.msk_tx_ring_paddr + sizeof(struct msk_tx_desc) * (i))
(sizeof(struct msk_tx_desc) * MSK_TX_RING_CNT)