[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>
diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c
index bdbf3de..0636883 100644
--- a/drivers/net/ibmveth.c
+++ b/drivers/net/ibmveth.c
@@ -821,15 +821,11 @@
 	.get_drvinfo		= netdev_get_drvinfo,
 	.get_settings		= netdev_get_settings,
 	.get_link		= netdev_get_link,
-	.get_sg			= ethtool_op_get_sg,
-	.get_tx_csum		= ethtool_op_get_tx_csum,
 	.set_tx_csum		= ibmveth_set_tx_csum,
 	.get_rx_csum		= ibmveth_get_rx_csum,
 	.set_rx_csum		= ibmveth_set_rx_csum,
-	.get_tso			= ethtool_op_get_tso,
-	.get_ufo			= ethtool_op_get_ufo,
 	.get_strings		= ibmveth_get_strings,
-	.get_stats_count		= ibmveth_get_stats_count,
+	.get_stats_count	= ibmveth_get_stats_count,
 	.get_ethtool_stats	= ibmveth_get_ethtool_stats,
 };