linux-kernel - [PATCHv3 1/6] skbuff: add an api to orphan frags

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Message-ID: <b39e1550258a76085f15ff99dae7f3e265598d8b.1342812067.git.mst@redhat.com>
Date:	Fri, 20 Jul 2012 22:23:07 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Jason Wang <jasowang@...hat.com>, eric.dumazet@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	ebiederm@...ssion.com, davem@...emloft.net
Subject: [PATCHv3 1/6] 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@...hat.com>
---
 include/linux/skbuff.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 642cb73..d205c4b 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
  *
-- 
MST

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