f7b29271c3
LAN9500 supports tx checksum offload, which slightly decreases cpu utilisation. The benefit isn't very large because we still require the skb to be linearized, but it does save a few cycles. This patch adds support for it, and enables it by default. Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com> Signed-off-by: David S. Miller <davem@davemloft.net>