linux-kernel - [35/49] net: release dst entry while cache-hot for GSO case too

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Message-Id: <20110105230326.974515123@clark.site>
Date:	Wed, 05 Jan 2011 15:00:53 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Krishna Kumar <krkumar2@...ibm.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andrey Vagin <avagin@...nvz.org>
Subject: [35/49] net: release dst entry while cache-hot for GSO case too

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

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

From: Krishna Kumar <krkumar2@...ibm.com>

commit 068a2de57ddf4f472e32e7af868613c574ad1d88 upstream.

Non-GSO code drops dst entry for performance reasons, but
the same is missing for GSO code. Drop dst while cache-hot
for GSO case too.

Signed-off-by: Krishna Kumar <krkumar2@...ibm.com>
Acked-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Andrey Vagin <avagin@...nvz.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/core/dev.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1747,6 +1747,14 @@ gso:
 
 		skb->next = nskb->next;
 		nskb->next = NULL;
+
+		/*
+		 * If device doesnt need nskb->dst, release it right now while
+		 * its hot in this cpu cache
+		 */
+		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
+			skb_dst_drop(nskb);
+
 		rc = ops->ndo_start_xmit(nskb, dev);
 		if (unlikely(rc != NETDEV_TX_OK)) {
 			nskb->next = skb->next;


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