linux-kernel - [PATCH v12 09/17] Don't do skb recycle, if device use external buffer.

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Message-Id: <480af4c409789eafb08c5aa13e3c195ae1ab747a.1285853725.git.xiaohui.xin@intel.com>
Date:	Thu, 30 Sep 2010 22:04:26 +0800
From:	xiaohui.xin@...el.com
To:	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com, mingo@...e.hu,
	davem@...emloft.net, herbert@...dor.apana.org.au,
	jdike@...ux.intel.com
Cc:	Xin Xiaohui <xiaohui.xin@...el.com>
Subject: [PATCH v12 09/17] Don't do skb recycle, if device use external buffer.

From: Xin Xiaohui <xiaohui.xin@...el.com>

    Signed-off-by: Xin Xiaohui <xiaohui.xin@...el.com>
    Signed-off-by: Zhao Yu <yzhao81new@...il.com>
    Reviewed-by: Jeff Dike <jdike@...ux.intel.com>
---
 net/core/skbuff.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 76c8301..1aede3a 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -565,6 +565,12 @@ int skb_recycle_check(struct sk_buff *skb, int skb_size)
 	if (skb_shared(skb) || skb_cloned(skb))
 		return 0;
 
+	/* if the device wants to do mediate passthru, the skb may
+	 * get external buffer, so don't recycle
+	 */
+	if (dev_is_mpassthru(skb->dev))
+		return 0;
+
 	skb_release_head_state(skb);
 	shinfo = skb_shinfo(skb);
 	atomic_set(&shinfo->dataref, 1);
-- 
1.7.3

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