Get channel information using ethtool-over-netlink #53

In recent kernels with the CONFIG_ETHTOOL_NETLINK kernel option enabled, one can retrieve (and even set) information using netlink that once required the grotesque ethtool ioctl(2)s. Go ahead and add netlink ethtool support, starting with channel information (ETHTOOL_A_CHANNELS_GET) ala the old ETHTOOL_GCHANNELS ioctl.

More information is available here