eth_tx_bd_types
union eth_tx_bd_types *tx_desc_ring;
#define TX_DESC_CNT (BCM_PAGE_SIZE / sizeof(union eth_tx_bd_types))
sizeof(union eth_tx_bd_types) * NUM_TX_BD);
sizeof(union eth_tx_bd_types) * NUM_TX_BD);
union eth_tx_bd_types bds[13];
union eth_tx_bd_types *txbd = (union eth_tx_bd_types *) udev->l2_ring;
.elem_size = sizeof(union eth_tx_bd_types),