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@neterion.com>
Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/vxge/vxge-main.c b/drivers/net/vxge/vxge-main.c
index 335140d2834a..beee4ab2ed30 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,