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authorAlexander Duyck <alexander.h.duyck@intel.com>2012-05-04 14:26:56 +0000
committerDavid S. Miller <davem@davemloft.net>2012-05-06 13:13:19 -0400
commitec47ea82477404631d49b8e568c71826c9b663ac (patch)
tree8b7890f23ad078d9eccbd4571e0b2da86b04a6a0 /include/linux/skbuff.h
parent3e24591a19bbda6fcb2cbe383b41b4ba794501bf (diff)
downloadblackbird-op-linux-ec47ea82477404631d49b8e568c71826c9b663ac.tar.gz
blackbird-op-linux-ec47ea82477404631d49b8e568c71826c9b663ac.zip
skb: Add inline helper for getting the skb end offset from head
With the recent changes for how we compute the skb truesize it occurs to me we are probably going to have a lot of calls to skb_end_pointer - skb->head. Instead of running all over the place doing that it would make more sense to just make it a separate inline skb_end_offset(skb) that way we can return the correct value without having gcc having to do all the optimization to cancel out skb->head - skb->head. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r--include/linux/skbuff.h12
1 files changed, 11 insertions, 1 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 37f539129d89..91ad5e227d1d 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -645,11 +645,21 @@ static inline unsigned char *skb_end_pointer(const struct sk_buff *skb)
{
return skb->head + skb->end;
}
+
+static inline unsigned int skb_end_offset(const struct sk_buff *skb)
+{
+ return skb->end;
+}
#else
static inline unsigned char *skb_end_pointer(const struct sk_buff *skb)
{
return skb->end;
}
+
+static inline unsigned int skb_end_offset(const struct sk_buff *skb)
+{
+ return skb->end - skb->head;
+}
#endif
/* Internal */
@@ -2558,7 +2568,7 @@ static inline bool skb_is_recycleable(const struct sk_buff *skb, int skb_size)
return false;
skb_size = SKB_DATA_ALIGN(skb_size + NET_SKB_PAD);
- if (skb_end_pointer(skb) - skb->head < skb_size)
+ if (skb_end_offset(skb) < skb_size)
return false;
if (skb_shared(skb) || skb_cloned(skb))
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