2 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index 1005ebf17575..5a09a48f2658 100644
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h
@@ -163,4 +163,11 @@ enum {
 /* changeable features with no special hardware requirements */
 #define NETIF_F_SOFT_FEATURES   (NETIF_F_GSO | NETIF_F_GRO)
 
+#define NETIF_F_VLAN_FEATURES   (NETIF_F_HW_VLAN_CTAG_FILTER | \
+                                 NETIF_F_HW_VLAN_CTAG_RX | \
+                                 NETIF_F_HW_VLAN_CTAG_TX | \
+                                 NETIF_F_HW_VLAN_STAG_FILTER | \
+                                 NETIF_F_HW_VLAN_STAG_RX | \
+                                 NETIF_F_HW_VLAN_STAG_TX)
+
 #endif  /* _LINUX_NETDEV_FEATURES_H */
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index a9591ff2b678..27bfe2f8e2de 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -578,6 +578,9 @@ static int vlan_dev_init(struct net_device *dev)
 
         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
         dev->gso_max_size = real_dev->gso_max_size;
+        if (dev->features & NETIF_F_VLAN_FEATURES)
+                netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
+
 
         /* ipv6 shared card related stuff */
         dev->dev_id = real_dev->dev_id;