vlan/macvlan: propagate transmission state to upper layers

Both vlan and macvlan devices usually don't use a qdisc and immediately
queue packets to the underlying device. Propagate transmission state of
the underlying device to the upper layers so they can react on congestion
and/or inform the sending process.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/macvlan.c

@@ -202,7 +202,7 @@ static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 	} else
 		txq->tx_dropped++;
 
-	return NETDEV_TX_OK;
+	return ret;
 }
 
 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,

net/8021q/vlan_dev.c

@@ -332,7 +332,7 @@ static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 	} else
 		txq->tx_dropped++;
 
-	return NETDEV_TX_OK;
+	return ret;
 }
 
 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
@@ -358,7 +358,7 @@ static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 	} else
 		txq->tx_dropped++;
 
-	return NETDEV_TX_OK;
+	return ret;
 }
 
 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)