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Date:	Sun, 25 May 2008 17:31:42 +0400
From:	Evgeniy Polyakov <>
To:	David Miller <>
Subject: Re: Single packet receiving in multiple ring buffers

On Sun, May 25, 2008 at 06:04:34AM -0700, David Miller ( wrote:
> > If it is not convenient to use such scheme, you can always put data
> > into pages and then copy tiny bit into skb->data to be able to
> > specify IP layer protocol, all the rest system will do for itself
> > via pskb_may_copy() if needed.
> The network input uses "pskb_may_pull()" not "pskb_may_copy()" :-)

For those who like pskb_may_copy() name, here is a patch :)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index bbd8d00..1fb5723 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -990,6 +990,11 @@ static inline int pskb_may_pull(struct sk_buff *skb, unsigned int len)
 	return __pskb_pull_tail(skb, len-skb_headlen(skb)) != NULL;
+static inline int pskb_may_copy(struct sk_buff *skb, unsigned int len)
+	return pskb_may_pull(skb, len);
  *	skb_headroom - bytes at buffer head
  *	@skb: buffer to check

	Evgeniy Polyakov
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