linux-kernel - [PATCH 3.4 35/43] skbuff: add an api to orphan frags

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Message-Id: <20140628174451.386819756@linuxfoundation.org>
Date:	Sat, 28 Jun 2014 10:46:26 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.4 35/43] skbuff: add an api to orphan frags

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Michael S. Tsirkin" <mst@...hat.com>

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 <mst@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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
  *


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