openwrt-xburst/target/linux/generic/patches-2.6.30/205-skb_padding.patch

--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1369,11 +1369,18 @@ static inline int skb_network_offset(con
  *
  * Various parts of the networking layer expect at least 32 bytes of
  * headroom, you should not reduce this.
+ *
+ * This has been changed to 64 to acommodate for routing between ethernet
+ * and wireless, but only for new allocations
  */
 #ifndef NET_SKB_PAD
 #define NET_SKB_PAD	32
 #endif
 
+#ifndef NET_SKB_PAD_ALLOC
+#define NET_SKB_PAD_ALLOC	64
+#endif
+
 extern int ___pskb_trim(struct sk_buff *skb, unsigned int len);
 
 static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
@@ -1463,9 +1470,9 @@ static inline void __skb_queue_purge(str
 static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
 					      gfp_t gfp_mask)
 {
-	struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD, gfp_mask);
+	struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask);
 	if (likely(skb))
-		skb_reserve(skb, NET_SKB_PAD);
+		skb_reserve(skb, NET_SKB_PAD_ALLOC);
 	return skb;
 }
 
@@ -1538,7 +1545,7 @@ static inline int __skb_cow(struct sk_bu
 		delta = headroom - skb_headroom(skb);
 
 	if (delta || cloned)
-		return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
+		return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD_ALLOC), 0,
 					GFP_ATOMIC);
 	return 0;
 }
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -327,9 +327,9 @@ struct sk_buff *__netdev_alloc_skb(struc
 	int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1;
 	struct sk_buff *skb;
 
-	skb = __alloc_skb(length + NET_SKB_PAD, gfp_mask, 0, node);
+	skb = __alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask, 0, node);
 	if (likely(skb)) {
-		skb_reserve(skb, NET_SKB_PAD);
+		skb_reserve(skb, NET_SKB_PAD_ALLOC);
 		skb->dev = dev;
 	}
 	return skb;