ti_tx_desc
TI_TX_RING_CNT * sizeof(struct ti_tx_desc));
struct ti_tx_desc txdesc;
struct ti_tx_desc *cur_tx = NULL;
struct ti_tx_desc txdesc;
struct ti_tx_desc *f = NULL;
sizeof(struct ti_tx_desc));
struct ti_tx_desc ti_tx_ring[TI_TX_RING_CNT];
struct ti_tx_desc *ti_tx_ring_nic;/* pointer to shared mem */