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Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r--include/linux/skbuff.h29
1 files changed, 25 insertions, 4 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 613b9513f8b9..c4619a428d9b 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -941,6 +941,25 @@ static inline void skb_reserve(struct sk_buff *skb, int len)
#define NET_IP_ALIGN 2
#endif
+/*
+ * The networking layer reserves some headroom in skb data (via
+ * dev_alloc_skb). This is used to avoid having to reallocate skb data when
+ * the header has to grow. In the default case, if the header has to grow
+ * 16 bytes or less we avoid the reallocation.
+ *
+ * Unfortunately this headroom changes the DMA alignment of the resulting
+ * network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive
+ * on some architectures. An architecture can override this value,
+ * perhaps setting it to a cacheline in size (since that will maintain
+ * cacheline alignment of the DMA). It must be a power of 2.
+ *
+ * Various parts of the networking layer expect at least 16 bytes of
+ * headroom, you should not reduce this.
+ */
+#ifndef NET_SKB_PAD
+#define NET_SKB_PAD 16
+#endif
+
extern int ___pskb_trim(struct sk_buff *skb, unsigned int len, int realloc);
static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
@@ -1030,9 +1049,9 @@ static inline void __skb_queue_purge(struct sk_buff_head *list)
static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
gfp_t gfp_mask)
{
- struct sk_buff *skb = alloc_skb(length + 16, gfp_mask);
+ struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD, gfp_mask);
if (likely(skb))
- skb_reserve(skb, 16);
+ skb_reserve(skb, NET_SKB_PAD);
return skb;
}
#else
@@ -1070,13 +1089,15 @@ static inline struct sk_buff *dev_alloc_skb(unsigned int length)
*/
static inline int skb_cow(struct sk_buff *skb, unsigned int headroom)
{
- int delta = (headroom > 16 ? headroom : 16) - skb_headroom(skb);
+ int delta = (headroom > NET_SKB_PAD ? headroom : NET_SKB_PAD) -
+ skb_headroom(skb);
if (delta < 0)
delta = 0;
if (delta || skb_cloned(skb))
- return pskb_expand_head(skb, (delta + 15) & ~15, 0, GFP_ATOMIC);
+ return pskb_expand_head(skb, (delta + (NET_SKB_PAD-1)) &
+ ~(NET_SKB_PAD-1), 0, GFP_ATOMIC);
return 0;
}