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Commit a353e0ce authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by David S. Miller
Browse files

skbuff: add an api to orphan frags 



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: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d47e12d6

include/linux/skbuff.h

+16 −0
Original line number Diff line number Diff line
@@ -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