Specifying the relative port number

LPAR mode z/VM guest

Use the portno attribute to specify the relative port number.

Before you begin

  • This description applies to network adapters that, per CHPID, show more than one port to Linux®.
  • The device must be offline while you specify the relative port number.

Procedure

By default, the qeth group device uses port 0.
To use a different port, issue a command of the form: 
# chzdev <device_bus_id> portno=<integer>
Where <integer> is either 0 or 1. This setting persists across re-boots. For more details, see Persistent device configuration.
To apply this setting to the running system only, use the chzdev command with the -a option or the sysfs attribute portno:
# echo <integer> > /sys/bus/ccwgroup/drivers/qeth/<device_bus_id>/portno

Example

In this example, port 1 is assigned to the qeth group device. 
# chzdev 0.0.a000 portno=1
or, using sysfs:
# echo 1 > /sys/bus/ccwgroup/drivers/qeth/0.0.a000/portno