vlan: Add GRO interfaces

This patch adds GRO interfaces for hardware-assisted VLAN reception.
With this in place we're now at parity with LRO as far as the
interface is concerned.  That is, you can now take any LRO driver
and convert it over to GRO.

As the CB memory clashes with GRO's use of CB, I've removed it
entirely by storing dev in skb->dev.  This is OK because VLAN
gets called first thing in netif_receive_skb and skb->dev is
not used in between us calling netif_rx and netif_receive_skb
getting called.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index a5cb0c3f6dcf..f8ff918c208f 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -115,6 +115,11 @@ extern u16 vlan_dev_vlan_id(const struct net_device *dev);
 extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
                              u16 vlan_tci, int polling);
 extern int vlan_hwaccel_do_receive(struct sk_buff *skb);
+extern int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
+                            unsigned int vlan_tci, struct sk_buff *skb);
+extern int vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
+                          unsigned int vlan_tci,
+                          struct napi_gro_fraginfo *info);
 
 #else
 static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
@@ -140,6 +145,20 @@ static inline int vlan_hwaccel_do_receive(struct sk_buff *skb)
 {
         return 0;
 }
+
+static inline int vlan_gro_receive(struct napi_struct *napi,
+                                   struct vlan_group *grp,
+                                   unsigned int vlan_tci, struct sk_buff *skb)
+{
+        return NET_RX_DROP;
+}
+
+static inline int vlan_gro_frags(struct napi_struct *napi,
+                                 struct vlan_group *grp, unsigned int vlan_tci,
+                                 struct napi_gro_fraginfo *info)
+{
+        return NET_RX_DROP;
+}
 #endif
 
 /**