• Arnd Bergmann's avatar
    usbnet: use eth%d name for known ethernet devices · c261344d
    Arnd Bergmann authored
    The documentation for the USB ethernet devices suggests that
    only some devices are supposed to use usb0 as the network interface
    name instead of eth0. The logic used there, and documented in
    Kconfig for CDC is that eth0 will be used when the mac address
    is a globally assigned one, but usb0 is used for the locally
    managed range that is typically used on point-to-point links.
    
    Unfortunately, this has caused a lot of pain on the smsc95xx
    device that is used on the popular pandaboard without an
    EEPROM to store the MAC address, which causes the driver to
    call random_ether_address().
    
    Obviously, there should be a proper MAC addressed assigned to
    the device, and discussions are ongoing about how to solve
    this, but this patch at least makes sure that the default
    interface naming gets a little saner and matches what the
    user can expect based on the documentation, including for
    new devices.
    
    The approach taken here is to flag whether a device might be a
    point-to-point link with the new FLAG_POINTTOPOINT setting in
    the usbnet driver_info. A driver can set both FLAG_POINTTOPOINT
    and FLAG_ETHER if it is not sure (e.g. cdc_ether), or just one
    of the two.  The usbnet framework only looks at the MAC address
    for device naming if both flags are set, otherwise it trusts the
    flag.
    Signed-off-by: default avatarArnd Bergmann <arnd.bergmann@linaro.org>
    Tested-by: default avatarAndy Green <andy.green@linaro.org>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    c261344d
cdc_subset.c 11 KB