net: Simplify ptp class checks

Replace two switch statements enumerating all valid ptp classes with an if
statement matching for not PTP_CLASS_NONE.
Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/timestamping.c

@@ -43,14 +43,9 @@ void skb_clone_tx_timestamp(struct sk_buff *skb)
 		return;
 
 	type = classify(skb);
+	if (type == PTP_CLASS_NONE)
+		return;
 
-	switch (type) {
-	case PTP_CLASS_V1_IPV4:
-	case PTP_CLASS_V1_IPV6:
-	case PTP_CLASS_V2_IPV4:
-	case PTP_CLASS_V2_IPV6:
-	case PTP_CLASS_V2_L2:
-	case PTP_CLASS_V2_VLAN:
 	phydev = skb->dev->phydev;
 	if (likely(phydev->drv->txtstamp)) {
 		if (!atomic_inc_not_zero(&sk->sk_refcnt))
@@ -65,10 +60,6 @@ void skb_clone_tx_timestamp(struct sk_buff *skb)
 		clone->sk = sk;
 		phydev->drv->txtstamp(phydev, clone, type);
 	}
-		break;
-	default:
-		break;
-	}
 }
 EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp);
 
@@ -114,20 +105,12 @@ bool skb_defer_rx_timestamp(struct sk_buff *skb)
 
 	__skb_pull(skb, ETH_HLEN);
 
-	switch (type) {
-	case PTP_CLASS_V1_IPV4:
-	case PTP_CLASS_V1_IPV6:
-	case PTP_CLASS_V2_IPV4:
-	case PTP_CLASS_V2_IPV6:
-	case PTP_CLASS_V2_L2:
-	case PTP_CLASS_V2_VLAN:
+	if (type == PTP_CLASS_NONE)
+		return false;
+
 	phydev = skb->dev->phydev;
 	if (likely(phydev->drv->rxtstamp))
 		return phydev->drv->rxtstamp(phydev, skb, type);
-		break;
-	default:
-		break;
-	}
 
 	return false;
 }