lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[NET] skbuff: Add skb_cow_head

Browse Source 
This patch adds an optimised version of skb_cow that avoids the copy if
the header can be modified even if the rest of the payload is cloned.

This can be used in encapsulating paths where we only need to modify the
header.  As it is, this can be used in PPPOE and bridging.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2007-09-16 16:21:16 -07:00
committed by David S. Miller
parent e081e1e3ef
commit d9cc20484e
3 changed files with 33 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/pppoe.c
View File

@@ -860,7 +860,7 @@ static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
/* Copy the data if there is no space for the header or if it's
* read-only.
*/
if (skb_cow(skb, sizeof(*ph) + dev->hard_header_len))
if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
goto abort;
__skb_push(skb, sizeof(*ph));