net: dsa: b53: Set untag_bridge_pvid

Indicate to the DSA receive path that we need to untage the bridge PVID,
this allows us to remove the dsa_untag_bridge_pvid() calls from
net/dsa/tag_brcm.c.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/b53/b53_common.c

@@ -2603,6 +2603,7 @@ struct b53_device *b53_switch_alloc(struct device *base,
 	dev->ops = ops;
 	ds->ops = &b53_switch_ops;
 	ds->configure_vlan_while_not_filtering = true;
+	ds->untag_bridge_pvid = true;
 	dev->vlan_enabled = ds->configure_vlan_while_not_filtering;
 	mutex_init(&dev->reg_mutex);
 	mutex_init(&dev->stats_mutex);

net/dsa/tag_brcm.c

@@ -152,11 +152,6 @@ static struct sk_buff *brcm_tag_rcv_ll(struct sk_buff *skb,
 	/* Remove Broadcom tag and update checksum */
 	skb_pull_rcsum(skb, BRCM_TAG_LEN);
 
-	/* Set the MAC header to where it should point for
-	 * dsa_untag_bridge_pvid() to parse the correct VLAN header.
-	 */
-	skb_set_mac_header(skb, -ETH_HLEN);
-
 	skb->offload_fwd_mark = 1;
 
 	return skb;
@@ -187,7 +182,7 @@ static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 		nskb->data - ETH_HLEN - BRCM_TAG_LEN,
 		2 * ETH_ALEN);
 
-	return dsa_untag_bridge_pvid(nskb);
+	return nskb;
 }
 
 static const struct dsa_device_ops brcm_netdev_ops = {
@@ -214,14 +209,8 @@ static struct sk_buff *brcm_tag_rcv_prepend(struct sk_buff *skb,
 					    struct net_device *dev,
 					    struct packet_type *pt)
 {
-	struct sk_buff *nskb;
-
 	/* tag is prepended to the packet */
-	nskb = brcm_tag_rcv_ll(skb, dev, pt, ETH_HLEN);
-	if (!nskb)
-		return nskb;
-
-	return dsa_untag_bridge_pvid(nskb);
+	return brcm_tag_rcv_ll(skb, dev, pt, ETH_HLEN);
 }
 
 static const struct dsa_device_ops brcm_prepend_netdev_ops = {