This is a note to let you know that I've just added the patch titled
skbuff: add an api to orphan frags
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
skbuff-add-an-api-to-orphan-frags.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From a353e0ce0fd42d8859260666d1e9b10f2abd4698 Mon Sep 17 00:00:00 2001
From: "Michael S. Tsirkin" <[email protected]>
Date: Fri, 20 Jul 2012 09:23:07 +0000
Subject: skbuff: add an api to orphan frags
From: "Michael S. Tsirkin" <[email protected]>
commit a353e0ce0fd42d8859260666d1e9b10f2abd4698 upstream.
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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
include/linux/skbuff.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1674,6 +1674,22 @@ static inline void skb_orphan(struct sk_
}
/**
+ * 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
*
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/skbuff-export-skb_copy_ubufs.patch
queue-3.4/skbuff-skb_segment-orphan-frags-before-copying.patch
queue-3.4/skbuff-add-an-api-to-orphan-frags.patch
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