qeth.ce500a <bus ID of the qeth device>: The HiperSockets device is already a primary Bridge Port
Explanation
A HiperSockets device cannot be configured as a primary or secondary Bridge Port if it is already configured as a primary Bridge Port.
User response
None, if you want the device to be a primary Bridge Port.
If you want to configure the device as a secondary Bridge Port,
withdraw the primary role by writing 'none' to the 'bridgeport_role'
sysfs attribute of the device. Then try again to configure the
device as the secondary Bridge Port.