netdev: Make ethtool_ops::set_flags() return -EINVAL for unsupported flags

The documented error code for attempts to set unsupported flags (or
to clear flags that cannot be disabled) is EINVAL, not EOPNOTSUPP.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2x_main.c

@@ -10983,7 +10983,7 @@ static int bnx2x_set_flags(struct net_device *dev, u32 data)
 	int rc = 0;
 
 	if (data & ~(ETH_FLAG_LRO | ETH_FLAG_RXHASH))
-		return -EOPNOTSUPP;
+		return -EINVAL;
 
 	if (bp->recovery_state != BNX2X_RECOVERY_DONE) {
 		printk(KERN_ERR "Handling parity error recovery. Try again later\n");

drivers/net/netxen/netxen_nic_ethtool.c

@@ -888,7 +888,7 @@ static int netxen_nic_set_flags(struct net_device *netdev, u32 data)
 	int hw_lro;
 
 	if (data & ~ETH_FLAG_LRO)
-		return -EOPNOTSUPP;
+		return -EINVAL;
 
 	if (!(adapter->capabilities & NX_FW_CAPABILITY_HW_LRO))
 		return -EINVAL;

drivers/net/qlcnic/qlcnic_ethtool.c

@@ -984,7 +984,7 @@ static int qlcnic_set_flags(struct net_device *netdev, u32 data)
 	int hw_lro;
 
 	if (data & ~ETH_FLAG_LRO)
-		return -EOPNOTSUPP;
+		return -EINVAL;
 
 	if (!(adapter->capabilities & QLCNIC_FW_CAPABILITY_HW_LRO))
 		return -EINVAL;

drivers/net/s2io.c

@@ -6692,7 +6692,7 @@ static int s2io_ethtool_set_flags(struct net_device *dev, u32 data)
 	int changed = 0;
 
 	if (data & ~ETH_FLAG_LRO)
-		return -EOPNOTSUPP;
+		return -EINVAL;
 
 	if (data & ETH_FLAG_LRO) {
 		if (lro_enable) {