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authorMichael S. Tsirkin <mst@redhat.com>2012-07-20 05:23:07 -0400
committerDavid S. Miller <davem@davemloft.net>2012-07-22 15:39:33 -0400
commita353e0ce0fd42d8859260666d1e9b10f2abd4698 (patch)
tree3c7e5807d36bec7e774ab164598ff34638681e31
parentd47e12d63e745f667a977226c3f59ae14521592d (diff)
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 <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/skbuff.h16
1 files changed, 16 insertions, 0 deletions
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
@@ -1667,6 +1667,22 @@ static inline void skb_orphan(struct sk_buff *skb)
1667} 1667}
1668 1668
1669/** 1669/**
1670 * skb_orphan_frags - orphan the frags contained in a buffer
1671 * @skb: buffer to orphan frags from
1672 * @gfp_mask: allocation mask for replacement pages
1673 *
1674 * For each frag in the SKB which needs a destructor (i.e. has an
1675 * owner) create a copy of that frag and release the original
1676 * page by calling the destructor.
1677 */
1678static inline int skb_orphan_frags(struct sk_buff *skb, gfp_t gfp_mask)
1679{
1680 if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY)))
1681 return 0;
1682 return skb_copy_ubufs(skb, gfp_mask);
1683}
1684
1685/**
1670 * __skb_queue_purge - empty a list 1686 * __skb_queue_purge - empty a list
1671 * @list: list to empty 1687 * @list: list to empty
1672 * 1688 *