code: func (e *Ethtool) BusInfo(intf string) (string, error) {
  	info, err := e.getDriverInfo(intf)
  	if err != nil {
  		return "", err
  	}
  	return string(bytes.Trim(info.bus_info[:], "\x00")), nil
  }
docs: // BusInfo returns the bus information of the given interface name.