net: release dst entry while cache-hot for GSO case too

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 <[email protected]> Acked-by: Eric Dumazet <[email protected]> Signed-off-by: David S. Miller <[email protected]>
makiko-fly · Dec 23, 2009 · 068a2de · 068a2de
1 parent def87cf
commit 068a2de
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/net/core/dev.c b/net/core/dev.c
@@ -1853,6 +1853,14 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 
 		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)) {
 			if (rc & ~NETDEV_TX_MASK)