With io-net, we were able to get the mac address of a particular port with:

nicfd = open(device, O_RDONLY);
devctl(nicfd, DCMD_IO_NET_GET_CONFIG, &nic, sizeof( nic_config_t );
close(nicfd);

Then use nic.current_address.

Since there isn't a device under dev with io-pkt with a native driver, how would you do the above?