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authorMichael S. Tsirkin <mst@redhat.com>2012-07-20 09:23:07 +0000
committerDavid S. Miller <davem@davemloft.net>2012-07-22 12:39:33 -0700
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 642cb7355df..d205c4be7f5 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1667,6 +1667,22 @@ static inline void skb_orphan(struct sk_buff *skb)
}
/**
+ * 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
*