vmxnet3: allow rx flow hash ops only when rss is enabled

It makes sense to allow changes to get/set rx flow hash callback only
when rss is enabled. This patch restricts get_rss_hash_opts and
set_rss_hash_opts methods to allow querying and configuring different
Rx flow hash configurations only when rss is enabled
Signed-off-by: NRonak Doshi <doshir@vmware.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/vmxnet3/vmxnet3_ethtool.c

@@ -899,6 +899,12 @@ vmxnet3_get_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *info,
 			err = -EOPNOTSUPP;
 			break;
 		}
+#ifdef VMXNET3_RSS
+		if (!adapter->rss) {
+			err = -EOPNOTSUPP;
+			break;
+		}
+#endif
 		err = vmxnet3_get_rss_hash_opts(adapter, info);
 		break;
 	default:
@@ -919,6 +925,12 @@ vmxnet3_set_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *info)
 		err = -EOPNOTSUPP;
 		goto done;
 	}
+#ifdef VMXNET3_RSS
+	if (!adapter->rss) {
+		err = -EOPNOTSUPP;
+		goto done;
+	}
+#endif
 
 	switch (info->cmd) {
 	case ETHTOOL_SRXFH: