linux-kernel - [PATCH net-next 3/4] net: dsa: Obtain VLAN protocol from skb->protocol

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Date:   Thu,  1 Oct 2020 19:42:14 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-kernel@...r.kernel.org (open list),
        vladimir.oltean@....com, olteanv@...il.com
Subject: [PATCH net-next 3/4] net: dsa: Obtain VLAN protocol from skb->protocol

Now that dsa_untag_bridge_pvid() is called after eth_type_trans() we are
guaranteed that skb->protocol will be set to a correct value, thus
allowing us to avoid calling vlan_eth_hdr().

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 net/dsa/dsa_priv.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 0348dbab4131..d6ce8c2a2590 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -201,7 +201,6 @@ dsa_slave_to_master(const struct net_device *dev)
 static inline struct sk_buff *dsa_untag_bridge_pvid(struct sk_buff *skb)
 {
 	struct dsa_port *dp = dsa_slave_to_port(skb->dev);
-	struct vlan_ethhdr *hdr = vlan_eth_hdr(skb);
 	struct net_device *br = dp->bridge_dev;
 	struct net_device *dev = skb->dev;
 	struct net_device *upper_dev;
@@ -217,7 +216,7 @@ static inline struct sk_buff *dsa_untag_bridge_pvid(struct sk_buff *skb)
 		return skb;
 
 	/* Move VLAN tag from data to hwaccel */
-	if (!skb_vlan_tag_present(skb) && hdr->h_vlan_proto == htons(proto)) {
+	if (!skb_vlan_tag_present(skb) && skb->protocol == htons(proto)) {
 		skb = skb_vlan_untag(skb);
 		if (!skb)
 			return NULL;
-- 
2.25.1