[vlan] Allow external code to identify VLAN priority as well as tag

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/vlan.h

diff --git a/src/include/ipxe/vlan.h b/src/include/ipxe/vlan.h
index 7f93439..e4baf4c 100644
--- a/src/include/ipxe/vlan.h
+++ b/src/include/ipxe/vlan.h
@@ -61,7 +61,19 @@
  */
 #define VLAN_PRIORITY_IS_VALID( priority ) ( (priority) <= 7 )
 
-extern unsigned int vlan_tag ( struct net_device *netdev );
+extern unsigned int vlan_tci ( struct net_device *netdev );
+
+/**
+ * Get the VLAN tag
+ *
+ * @v netdev		Network device
+ * @ret tag		VLAN tag, or 0 if device is not a VLAN device
+ */
+static inline __attribute__ (( always_inline )) unsigned int
+vlan_tag ( struct net_device *netdev ) {
+	return VLAN_TAG ( vlan_tci ( netdev ) );
+}
+
 extern int vlan_can_be_trunk ( struct net_device *trunk );
 extern int vlan_create ( struct net_device *trunk, unsigned int tag,
 			 unsigned int priority );

src/net/netdevice.c

diff --git a/src/net/netdevice.c b/src/net/netdevice.c
index 5df306e..51d1831 100644
--- a/src/net/netdevice.c
+++ b/src/net/netdevice.c
@@ -1171,12 +1171,12 @@
 }
 
 /**
- * Get the VLAN tag (when VLAN support is not present)
+ * Get the VLAN tag control information (when VLAN support is not present)
  *
  * @v netdev		Network device
  * @ret tag		0, indicating that device is not a VLAN device
  */
-__weak unsigned int vlan_tag ( struct net_device *netdev __unused ) {
+__weak unsigned int vlan_tci ( struct net_device *netdev __unused ) {
 	return 0;
 }
 

src/net/vlan.c

diff --git a/src/net/vlan.c b/src/net/vlan.c
index 90f2934..fe44886 100644
--- a/src/net/vlan.c
+++ b/src/net/vlan.c
@@ -288,17 +288,17 @@
 };
 
 /**
- * Get the VLAN tag
+ * Get the VLAN tag control information
  *
  * @v netdev		Network device
- * @ret tag		VLAN tag, or 0 if device is not a VLAN device
+ * @ret tci		VLAN tag control information, or 0 if not a VLAN device
  */
-unsigned int vlan_tag ( struct net_device *netdev ) {
+unsigned int vlan_tci ( struct net_device *netdev ) {
 	struct vlan_device *vlan;
 
 	if ( netdev->op == &vlan_operations ) {
 		vlan = netdev->priv;
-		return vlan->tag;
+		return ( VLAN_TCI ( vlan->tag, vlan->priority ) );
 	} else {
 		return 0;
 	}