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net: add documentation for skb recycling

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Commit 04a4bb55bcf35b63d40fd2725e58599ff8310dd7 ("net: add
skb_recycle_check() to enable netdriver skb recycling") added a
method for network drivers to recycle skbuffs, but while use of
this mechanism was documented in the commit message, it should
really have been added as a docbook comment as well -- this
patch does that.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2008-11-01 21:01:09 -07:00 committed by David S. Miller
parent 920da6923c
commit d1a203eac0
1 changed files with 12 additions and 0 deletions
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12
net/core/skbuff.c
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@ -449,6 +449,18 @@ void kfree_skb(struct sk_buff *skb)
__kfree_skb(skb);
}
/**
* skb_recycle_check - check if skb can be reused for receive
* @skb: buffer
* @skb_size: minimum receive buffer size
*
* Checks that the skb passed in is not shared or cloned, and
* that it is linear and its head portion at least as large as
* skb_size so that it can be recycled as a receive buffer.
* If these conditions are met, this function does any necessary
* reference count dropping and cleans up the skbuff as if it
* just came from __alloc_skb().
*/
int skb_recycle_check(struct sk_buff *skb, int skb_size)
{
struct skb_shared_info *shinfo;