smsc95xx: add tx checksum offload support
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: NSteve Glendinning <steve.glendinning@smsc.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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