linux-kernel - Re: Fwd: Re: Linux r8169 interrupt patch

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Date:	Wed, 25 Aug 2010 00:07:08 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Alex <alexbtk@....de>
Cc:	eric.dumazet@...il.com, rjw@...k.pl, davem@...emloft.net,
	adobriyan@...il.com, jpirko@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Fwd: Re: Linux r8169 interrupt patch

Alex <alexbtk@....de> :
[...]
> I am writing to you, on case of the linux r8169 interrupt bug.
> Sergey gave me your addresses. I assume you can read all the
> neccessary informations below. Please reopen the thread at the
> bugtracker.
> I have several servers running with this chipset and driver. In my
> case, the problem is very critical. Network brokes even every day
> down. I can provide some testing if you would give me some patches
> or solution tips.

Can you send a complete dmesg from boot until problem and give the
patch below a try ?

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 078bbf4..ec706d2 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -4327,13 +4327,13 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
 
 	tp->cur_tx += frags + 1;
 
-	wmb();
-
 	RTL_W8(TxPoll, NPQ);	/* set polling bit */
 
+	mmiowb();
+
 	if (TX_BUFFS_AVAIL(tp) < MAX_SKB_FRAGS) {
 		netif_stop_queue(dev);
-		smp_rmb();
+		smp_mb();
 		if (TX_BUFFS_AVAIL(tp) >= MAX_SKB_FRAGS)
 			netif_wake_queue(dev);
 	}
@@ -4428,10 +4428,14 @@ static void rtl8169_tx_interrupt(struct net_device *dev,
 
 	if (tp->dirty_tx != dirty_tx) {
 		tp->dirty_tx = dirty_tx;
-		smp_wmb();
-		if (netif_queue_stopped(dev) &&
-		    (TX_BUFFS_AVAIL(tp) >= MAX_SKB_FRAGS)) {
-			netif_wake_queue(dev);
+		smp_mb();
+		if (unlikely(netif_queue_stopped(dev) &&
+		    (TX_BUFFS_AVAIL(tp) >= (NUM_TX_DESC / 4)))) {
+			netif_tx_lock(dev);
+			if (netif_queue_stopped(dev) &&
+			    (TX_BUFFS_AVAIL(tp) >= (NUM_TX_DESC / 4)))
+				netif_wake_queue(dev);
+			netif_tx_unlock(dev);
 		}
 		/*
 		 * 8168 hack: TxPoll requests are lost when the Tx packets are
--
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