bnx2/bnx2x: Unsupported Ethtool operations should return -EINVAL.

Some cards don't support changing vlan offloading settings.  Make
Ethtool set_flags return -EINVAL in those cases.
Reported-by: NBen Hutchings <bhutchings@solarflare.com>
Signed-off-by: NJesse Gross <jesse@nicira.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/bnx2.c

@@ -7528,7 +7528,7 @@ bnx2_set_flags(struct net_device *dev, u32 data)
 
 	if (!(bp->flags & BNX2_FLAG_CAN_KEEP_VLAN) &&
 	    !(data & ETH_FLAG_RXVLAN))
-		return -EOPNOTSUPP;
+		return -EINVAL;
 
 	rc = ethtool_op_set_flags(dev, data, ETH_FLAG_RXHASH | ETH_FLAG_RXVLAN |
 				  ETH_FLAG_TXVLAN);

drivers/net/bnx2x/bnx2x_ethtool.c

@@ -1123,7 +1123,7 @@ static int bnx2x_set_flags(struct net_device *dev, u32 data)
 	}
 
 	if (!(data & ETH_FLAG_RXVLAN))
-		return -EOPNOTSUPP;
+		return -EINVAL;
 
 	if ((data & ETH_FLAG_LRO) && bp->rx_csum && bp->disable_tpa)
 		return -EINVAL;