IE_RXBUF_SIZE
return(actual & (IE_RXBUF_SIZE | (IE_RXBUF_SIZE-1))) ;
((NRXBUF*IE_RXBUF_SIZE)+(NTXBUF*IE_TXBUF_SIZE))/1024 );
rbd.ie_rbd_length = IE_RXBUF_SIZE;
rbd.ie_rbd_next = (u_short)(ptr + sizeof rbd + IE_RXBUF_SIZE);
ptr+=IE_RXBUF_SIZE;