netvsc: report rss field values

Report current components used in RSS hash.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/hyperv/netvsc_drv.c

@@ -1008,6 +1008,30 @@ static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 	}
 }
 
+static int
+netvsc_get_rss_hash_opts(struct netvsc_device *nvdev,
+			 struct ethtool_rxnfc *info)
+{
+	info->data = RXH_IP_SRC | RXH_IP_DST;
+
+	switch (info->flow_type) {
+	case TCP_V4_FLOW:
+	case TCP_V6_FLOW:
+		info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
+		/* fallthrough */
+	case UDP_V4_FLOW:
+	case UDP_V6_FLOW:
+	case IPV4_FLOW:
+	case IPV6_FLOW:
+		break;
+	default:
+		info->data = 0;
+		break;
+	}
+
+	return 0;
+}
+
 static int
 netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
 		 u32 *rules)
@@ -1019,6 +1043,9 @@ netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
 	case ETHTOOL_GRXRINGS:
 		info->data = nvdev->num_chn;
 		return 0;
+
+	case ETHTOOL_GRXFH:
+		return netvsc_get_rss_hash_opts(nvdev, info);
 	}
 	return -EOPNOTSUPP;
 }