net: Move check for multiple vlans to drivers

[uclinux-h8/linux.git] / include / linux / if_vlan.h

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 4265d44..920e445 100644 (file)
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -606,4 +606,26 @@ static inline bool skb_vlan_tagged_multi(const struct sk_buff *skb)
        return true;
 }
 
+/**
+ * vlan_features_check - drop unsafe features for skb with multiple tags.
+ * @skb: skbuff to query
+ * @features: features to be checked
+ *
+ * Returns features without unsafe ones if the skb has multiple tags.
+ */
+static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
+                                                   netdev_features_t features)
+{
+       if (skb_vlan_tagged_multi(skb))
+               features = netdev_intersect_features(features,
+                                                    NETIF_F_SG |
+                                                    NETIF_F_HIGHDMA |
+                                                    NETIF_F_FRAGLIST |
+                                                    NETIF_F_GEN_CSUM |
+                                                    NETIF_F_HW_VLAN_CTAG_TX |
+                                                    NETIF_F_HW_VLAN_STAG_TX);
+
+       return features;
+}
+
 #endif /* !(_LINUX_IF_VLAN_H_) */