IBM s390 QDIO Ethernet Driver
  
  OSA and HiperSockets Bridge Port Support
  
  Uevents
  
  To generate the events the device must be assigned a role of either
  a primary or a secondary Bridge Port. For more information, see
  "z/VM Connectivity, SC24-6174".
  
  When run on an OSA or HiperSockets Bridge Capable Port hardware, and the state
  of some configured Bridge Port device on the channel changes, a udev
  event with ACTION=CHANGE is emitted on behalf of the corresponding
  ccwgroup device. The event has the following attributes:
  
  BRIDGEPORT=statechange -  indicates that the Bridge Port device changed
    its state.
  
  ROLE={primary|secondary|none} - the role assigned to the port.
  
  STATE={active|standby|inactive} - the newly assumed state of the port.
  
  When run on HiperSockets Bridge Capable Port hardware with host address
  notifications enabled, a udev event with ACTION=CHANGE is emitted.
  It is emitted on behalf of the corresponding ccwgroup device when a host
  or a VLAN is registered or unregistered on the network served by the device.
  The event has the following attributes:
  
  BRIDGEDHOST={reset|register|deregister|abort} - host address
    notifications are started afresh, a new host or VLAN is registered or
    deregistered on the Bridge Port HiperSockets channel, or address
    notifications are aborted.
  
  VLAN=numeric-vlan-id - VLAN ID on which the event occurred. Not included
    if no VLAN is involved in the event.
  
  MAC=xx:xx:xx:xx:xx:xx - MAC address of the host that is being registered
    or deregistered from the HiperSockets channel. Not reported if the
    event reports the creation or destruction of a VLAN.
  
  NTOK_BUSID=x.y.zzzz - device bus ID (CSSID, SSID and device number).
  
  NTOK_IID=xx - device IID.
  
  NTOK_CHPID=xx - device CHPID.
  
  NTOK_CHID=xxxx - device channel ID.
  
  Note that the NTOK_* attributes refer to devices other than  the one
  connected to the system on which the OS is running.