There is no way for an application to get the Ethernet bandwidth 
information from eepro100(version 1.18). I have a work around by adding 
the following code to the driver(after line 1932):

case SIOCDEVPRIVATE+3:		/* return the bandwidth */
{
    short data = mdio_read(ioaddr, phy, 0);
    if (data & 0x1000) /* Auto-negotiate? */ {
	data = mdio_read(ioaddr, phy, 16);
	rq->ifr_bandwidth = (data & 0x0002) ? 100000000 : 10000000;
    } else {
	rq->ifr_bandwidth = (data & 0x2000) ? 100000000 : 10000000;
    }
}
return 0;
 
And use the following code in the application to get the bandwidth:
    fd = socket(AF_INET, SOCK_DGRAM, 0);
    strcpy(req.ifr_name, "eth0");
    if (ioctl(fd, SIOCDEVPRIVATE+3, &req) != -1) 
        bandWidth = req.ifr_bandwidth;

It would be nice to have a special ioctl to get these information.