netdev - [PATCH net-next] mlx4: dont orphan skbs in mlx4_en

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Date:	Fri, 28 Sep 2012 19:53:26 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yevgeny Petrilin <yevgenyp@...lanox.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Or Gerlitz <ogerlitz@...lanox.com>
Subject: [PATCH net-next] mlx4: dont orphan skbs in mlx4_en_xmit()

From: Eric Dumazet <edumazet@...gle.com>

After commit e22979d96a55d (mlx4_en: Moving to Interrupts for TX
completions) we no longer need to orphan skbs in mlx4_en_xmit()
since skb wont stay a long time in TX ring before their release.

Orphaning skbs in ndo_start_xmit() should be avoided as much as
possible, since it breaks TCP Small Queue or other flow control
mechanisms (per socket limits)

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Yevgeny Petrilin <yevgenyp@...lanox.com>
Cc: Or Gerlitz <ogerlitz@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_tx.c |    4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 10bba09..c10e3a6 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -712,10 +712,6 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (bounce)
 		tx_desc = mlx4_en_bounce_to_desc(priv, ring, index, desc_size);
 
-	/* Run destructor before passing skb to HW */
-	if (likely(!skb_shared(skb)))
-		skb_orphan(skb);
-
 	if (ring->bf_enabled && desc_size <= MAX_BF && !bounce && !vlan_tag) {
 		*(__be32 *) (&tx_desc->ctrl.vlan_tag) |= cpu_to_be32(ring->doorbell_qpn);
 		op_own |= htonl((bf_index & 0xffff) << 8);


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