From a353e0ce0fd42d8859260666d1e9b10f2abd4698 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Fri, 20 Jul 2012 09:23:07 +0000 Subject: [PATCH] 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: Michael S. Tsirkin Signed-off-by: David S. Miller --- include/linux/skbuff.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 642cb7355df3..d205c4be7f5b 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -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 -- 2.30.2