netdev - [PATCH net-next-2.6] net: call dev_queue_xmit_nit() after skb_dst

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Date:	Tue, 07 Dec 2010 08:19:19 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: [PATCH net-next-2.6] net: call dev_queue_xmit_nit() after
 skb_dst_drop()

Avoid some atomic ops on dst refcount, calling dev_queue_xmit_nit()
after skb_dst_drop() in dev_hard_start_xmit().

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
Next patch will perform the sk_run_filter() in dev_queue_xmit_nit(),
before cloning skb and af_packet rcv() call.

 net/core/dev.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 55ff66f..59360ef 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2025,9 +2025,6 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 	int rc = NETDEV_TX_OK;
 
 	if (likely(!skb->next)) {
-		if (!list_empty(&ptype_all))
-			dev_queue_xmit_nit(skb, dev);
-
 		/*
 		 * If device doesnt need skb->dst, release it right now while
 		 * its hot in this cpu cache
@@ -2037,6 +2034,9 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 
 		skb_orphan_try(skb);
 
+		if (!list_empty(&ptype_all))
+			dev_queue_xmit_nit(skb, dev);
+
 		if (vlan_tx_tag_present(skb) &&
 		    !(dev->features & NETIF_F_HW_VLAN_TX)) {
 			skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));


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