• Mike Looijmans's avatar
    usb: gadget: ether: Allow changing the MTU · ab738ff1
    Mike Looijmans authored
    The gadget ethernet driver supports changing the MTU, but only allows this
    when the USB cable is removed. The comment indicates that this is because
    the "peer won't know". Even if the network link is still down and only the
    USB link is established, the driver won't allow the change.
    
    Other network interfaces allow changing the MTU any time, and don't force
    the link to be disabled. This makes perfect sense, because in order to be
    able to negotiate the MTU, the link needs to be up.
    
    Remove the restriction so that it is now actually possible to change the
    MTU (e.g. using "ifconfig usb0 mtu 15000") without having to manually pull
    the plug or change the driver's default setting.
    
    This is especially important after commit bba787a8
    ("usb: gadget: ether: Allow jumbo frames")
    Signed-off-by: default avatarMike Looijmans <mike.looijmans@topic.nl>
    Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
    ab738ff1
u_ether.c 28.7 KB