netdev - [1/6] vxge: don't drop frame on tx queue full

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Date:	Tue, 4 Aug 2009 16:20:44 -0400
From:	Benjamin LaHaise <ben.lahaise@...erion.com>
To:	netdev@...r.kernel.org
Subject: [1/6] vxge: don't drop frame on tx queue full

The vxge driver will drop a packet in its transmit function if the number
of TxDs available hits 0.  Instead of doing that, simply stop the transmit
queue when transmitting a packet with the last available TxD.

Signed-off-by: Benjamin LaHaise <ben.lahaise@...erion.com>
Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@...erion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@...erion.com>
---
 drivers/net/vxge/vxge-main.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/net/vxge/vxge-main.c b/drivers/net/vxge/vxge-main.c
index 7b5402b..7c2241c 100644
--- a/drivers/net/vxge/vxge-main.c
+++ b/drivers/net/vxge/vxge-main.c
@@ -895,6 +895,12 @@ vxge_xmit(struct sk_buff *skb, struct net_device *dev)
 		goto _exit2;
 	}
 
+	/* Last TXD?  Stop tx queue to avoid dropping packets.  TX
+	 * completion will resume the queue.
+	 */
+	if (avail == 1)
+		vxge_stop_tx_queue(fifo);
+
 	status = vxge_hw_fifo_txdl_reserve(fifo_hw, &dtr, &dtr_priv);
 	if (unlikely(status != VXGE_HW_OK)) {
 		vxge_debug_tx(VXGE_ERR,
-- 
1.6.0.6

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