[ETHTOOL] Provide default behaviors for a few ethtool sub-ioctls

For the operations
	get-tx-csum
	get-sg
	get-tso
	get-ufo
the default ethtool_op_xxx behavior is fine for all drivers, so we
permit op==NULL to imply the default behavior.

This provides a more uniform behavior across all drivers, eliminating
ethtool(8) "ioctl not supported" errors on older drivers that had
not been updated for the latest sub-ioctls.

The ethtool_op_xxx() functions are left exported, in case anyone
wishes to call them directly from a driver-private implementation --
a not-uncommon case.  Should an ethtool_op_xxx() helper remain unused
for a while, except by net/core/ethtool.c, we can un-export it at a
later date.

[ Resolved conflicts with set/get value ethtool patch... -DaveM ]

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/pcnet32.c

@@ -1509,9 +1509,6 @@ static const struct ethtool_ops pcnet32_ethtool_ops = {
 	.get_link		= pcnet32_get_link,
 	.get_ringparam		= pcnet32_get_ringparam,
 	.set_ringparam		= pcnet32_set_ringparam,
-	.get_tx_csum		= ethtool_op_get_tx_csum,
-	.get_sg			= ethtool_op_get_sg,
-	.get_tso		= ethtool_op_get_tso,
 	.get_strings		= pcnet32_get_strings,
 	.self_test_count	= pcnet32_self_test_count,
 	.self_test		= pcnet32_ethtool_test,