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skbuff: add an api to orphan frags

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Many places do
       if ((skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY))
		skb_copy_ubufs(skb, gfp_mask);
to copy and invoke frag destructors if necessary.
Add an inline helper for this.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael S. Tsirkin 2012-07-20 09:23:07 +00:00 committed by David S. Miller
parent d47e12d63e
commit a353e0ce0f
1 changed files with 16 additions and 0 deletions
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16
include/linux/skbuff.h
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@ -1666,6 +1666,22 @@ static inline void skb_orphan(struct sk_buff *skb)
skb->sk = NULL;
}
/**
* skb_orphan_frags - orphan the frags contained in a buffer
* @skb: buffer to orphan frags from
* @gfp_mask: allocation mask for replacement pages
*
* For each frag in the SKB which needs a destructor (i.e. has an
* owner) create a copy of that frag and release the original
* page by calling the destructor.
*/
static inline int skb_orphan_frags(struct sk_buff *skb, gfp_t gfp_mask)
{
if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY)))
return 0;
return skb_copy_ubufs(skb, gfp_mask);
}
/**
* __skb_queue_purge - empty a list
* @list: list to empty