RIONET_TX_RING_SIZE
if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
RIONET_TX_RING_SIZE,
struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];