target/linux/generic-2.6/patches-2.6.31/205-skb_padding.patch

   1 --- a/include/linux/skbuff.h
   2 +++ b/include/linux/skbuff.h
   3 @@ -1387,11 +1387,18 @@ static inline int skb_network_offset(con
   4   *
   5   * Various parts of the networking layer expect at least 32 bytes of
   6   * headroom, you should not reduce this.
   7 + *
   8 + * This has been changed to 64 to acommodate for routing between ethernet
   9 + * and wireless, but only for new allocations
  10   */
  11  #ifndef NET_SKB_PAD
  12  #define NET_SKB_PAD    32
  13  #endif
  14
  15 +#ifndef NET_SKB_PAD_ALLOC
  16 +#define NET_SKB_PAD_ALLOC      64
  17 +#endif
  18 +
  19  extern int ___pskb_trim(struct sk_buff *skb, unsigned int len);
  20
  21  static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
  22 @@ -1481,9 +1488,9 @@ static inline void __skb_queue_purge(str
  23  static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
  24                                               gfp_t gfp_mask)
  25  {
  26 -       struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD, gfp_mask);
  27 +       struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask);
  28         if (likely(skb))
  29 -               skb_reserve(skb, NET_SKB_PAD);
  30 +               skb_reserve(skb, NET_SKB_PAD_ALLOC);
  31         return skb;
  32  }
  33
  34 @@ -1556,7 +1563,7 @@ static inline int __skb_cow(struct sk_bu
  35                 delta = headroom - skb_headroom(skb);
  36
  37         if (delta || cloned)
  38 -               return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
  39 +               return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD_ALLOC), 0,
  40                                         GFP_ATOMIC);
  41         return 0;
  42  }
  43 --- a/net/core/skbuff.c
  44 +++ b/net/core/skbuff.c
  45 @@ -336,9 +336,9 @@ struct sk_buff *__netdev_alloc_skb(struc
  46         int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1;
  47         struct sk_buff *skb;
  48
  49 -       skb = __alloc_skb(length + NET_SKB_PAD, gfp_mask, 0, node);
  50 +       skb = __alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask, 0, node);
  51         if (likely(skb)) {
  52 -               skb_reserve(skb, NET_SKB_PAD);
  53 +               skb_reserve(skb, NET_SKB_PAD_ALLOC);
  54                 skb->dev = dev;
  55         }
  56         return skb;