netdev - Re: [PATCH net-next-2.6] net: Introduce skb_orphan

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Message-Id: <20100422.005421.155629785.davem@davemloft.net>
Date:	Thu, 22 Apr 2010 00:54:21 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] net: Introduce skb_orphan_try()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 22 Apr 2010 09:47:03 +0200

> You could have one skb_orphan_try() call before the
> 
> if (netif_needs_gso(dev, skb)) {
> 
> and remove it from dev_gso_segment() ?

Yes, that's much more concise.  This should be ready to go:

net: Orphan and de-dst skbs earlier in xmit path.

This way GSO packets don't get handled differently.

With help from Eric Dumazet.

Signed-off-by: David S. Miller <davem@...emloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index 3ba774b..a4a7c36 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1902,13 +1902,6 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 		if (!list_empty(&ptype_all))
 			dev_queue_xmit_nit(skb, dev);
 
-		if (netif_needs_gso(dev, skb)) {
-			if (unlikely(dev_gso_segment(skb)))
-				goto out_kfree_skb;
-			if (skb->next)
-				goto gso;
-		}
-
 		/*
 		 * If device doesnt need skb->dst, release it right now while
 		 * its hot in this cpu cache
@@ -1917,6 +1910,14 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 			skb_dst_drop(skb);
 
 		skb_orphan_try(skb);
+
+		if (netif_needs_gso(dev, skb)) {
+			if (unlikely(dev_gso_segment(skb)))
+				goto out_kfree_skb;
+			if (skb->next)
+				goto gso;
+		}
+
 		rc = ops->ndo_start_xmit(skb, dev);
 		if (rc == NETDEV_TX_OK)
 			txq_trans_update(txq);
--
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