net/hyperv: use skb_vlan_tag_*() helpers

Replace open-coded bitfield manipulation with skb_vlan_tag_*() helpers.
This also enables correctly passing of VLAN.CFI bit.
Signed-off-by: NMichał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: NHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/hyperv/netvsc_drv.c

@@ -605,9 +605,9 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 				     IEEE_8021Q_INFO);
 
 		vlan->value = 0;
-		vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
-		vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
-				VLAN_PRIO_SHIFT;
+		vlan->vlanid = skb_vlan_tag_get_id(skb);
+		vlan->cfi = skb_vlan_tag_get_cfi(skb);
+		vlan->pri = skb_vlan_tag_get_prio(skb);
 	}
 
 	if (skb_is_gso(skb)) {
@@ -781,7 +781,8 @@ static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 	}
 
 	if (vlan) {
-		u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT);
+		u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT) |
+			(vlan->cfi ? VLAN_CFI_MASK : 0);
 
 		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 				       vlan_tci);