From 41812db8e2111abbebff4fccffecab1fc1eb090c Mon Sep 17 00:00:00 2001
From: Jitendra Kalsaria <jitendra.kalsaria@qlogic.com>
Date: Tue, 10 Jul 2012 14:57:31 +0000
Subject: [PATCH] qlge: Fix TX queue stoppage due to full condition.
TX queue was being stopped at beginning of send path instead
of at the end when last descriptor is used.
Signed-off-by: Jitendra Kalsaria <jitendra.kalsaria@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/qlogic/qlge/qlge_main.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/qlogic/qlge/qlge_main.c b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
index ca427eb32369..fb86f06e8f1e 100644
--- a/drivers/net/ethernet/qlogic/qlge/qlge_main.c
+++ b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
@@ -2556,7 +2556,7 @@ static netdev_tx_t qlge_send(struct sk_buff *skb, struct net_device *ndev)
if (unlikely(atomic_read(&tx_ring->tx_count) < 2)) {
netif_info(qdev, tx_queued, qdev->ndev,
- "%s: shutting down tx queue %d du to lack of resources.\n",
+ "%s: BUG! shutting down tx queue %d due to lack of resources.\n",
__func__, tx_ring_idx);
netif_stop_subqueue(ndev, tx_ring->wq_id);
atomic_inc(&tx_ring->queue_stopped);
@@ -2610,6 +2610,16 @@ static netdev_tx_t qlge_send(struct sk_buff *skb, struct net_device *ndev)
tx_ring->prod_idx, skb->len);
atomic_dec(&tx_ring->tx_count);
+
+ if (unlikely(atomic_read(&tx_ring->tx_count) < 2)) {
+ netif_stop_subqueue(ndev, tx_ring->wq_id);
+ if ((atomic_read(&tx_ring->tx_count) > (tx_ring->wq_len / 4)))
+ /*
+ * The queue got stopped because the tx_ring was full.
+ * Wake it up, because it's now at least 25% empty.
+ */
+ netif_wake_subqueue(qdev->ndev, tx_ring->wq_id);
+ }
return NETDEV_TX_OK;
}
--
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