Add support for the following ethtool commands:

ethtool -s|--change devname [msglvl N] [msglevel type on|off]
ethtool -S|--statistics devname
ethtool -i|--driver devname
ethtool -l|--show-channels devname
ethtool -L|--set-channels devname
ethtool -g|--show-ring devname
ethtool --reset devname
Signed-off-by: NCatherine Sullivan <csully@google.com>
Signed-off-by: NSagi Shahar <sagis@google.com>
Signed-off-by: NJon Olson <jonolson@google.com>
Acked-by: NWillem de Bruijn <willemb@google.com>
Reviewed-by: NLuigi Rizzo <lrizzo@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>