qeth.f823af `<bus ID of the qeth device>`: QDIO reported an error, rc=`<return code>`

Explanation
The QDIO subsystem reported an error.
User response
Check for related QDIO errors. Check the status of the qeth device, for
example, with the lsqeth command. If the device is not operational, initiate
a recovery process, for example, by writing '1' to the 'recover' sysfs
attribute of the device.
Severity
Warning