91   	u_int tx_head, tx_tail; /* Head and tail of transmit ring buffer. */  member
354 	sc->tx_head = sc->tx_tail = sc->tx_lower_limit;  in ex_init()
410 		if ((i = sc->tx_tail - sc->tx_head) >= 0)  in ex_start()
477 			if (sc->tx_head != sc->tx_tail) {  in ex_start()
501 			if (sc->tx_head == sc->tx_tail) {  in ex_start()
504 				sc->tx_head = dest;  in ex_start()
545 	sc->tx_head = sc->tx_tail = sc->tx_lower_limit;  in ex_stop()
617 	while (sc->tx_head != sc->tx_tail) {  in ex_tx_intr()
618 		CSR_WRITE_2(sc, HOST_ADDR_REG, sc->tx_head);  in ex_tx_intr()
622 		sc->tx_head = CSR_READ_2(sc, IO_PORT_REG);  in ex_tx_intr()
842 		sc->tx_head = sc->tx_lower_limit;  in ex_setmulti()
843 		sc->tx_tail = sc->tx_head + XMT_HEADER_LEN + (count + 1) * 6;  in ex_setmulti()
855 		sc->tx_head = sc->tx_tail;  in ex_setmulti()