linux-kernel - Re: [bug?] r8169: hangs under heavy load

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Date:	Sat, 26 Nov 2011 01:44:47 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Jonathan Nieder <jrnieder@...il.com>, netdev@...r.kernel.org,
	nic_swsd@...ltek.com, linux-kernel@...r.kernel.org,
	Armin Kazmi <armin.kazmi@...dortmund.de>,
	Gerd <booster@...ke7.net>
Subject: Re: [bug?] r8169: hangs under heavy load

Eric Dumazet <eric.dumazet@...il.com> :
> Le vendredi 25 novembre 2011 ?? 23:22 +0100, Francois Romieu a ??crit :
[...]
> > This path is not used.
> 
> OK, then we receive a RxFIFOOver indication while napi handler is
> running (quite possible if machine under network load)

Welcome to the post 92fc43b4159b518f5baae57301f26d770b0834c9 world. :o/

The hack below could help (the XID matches RTL_GIGA_MAC_VER_22):

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 6f06aa1..4fcfb3f 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -5818,7 +5818,6 @@ static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
 			switch (tp->mac_version) {
 			/* Work around for rx fifo overflow */
 			case RTL_GIGA_MAC_VER_11:
-			case RTL_GIGA_MAC_VER_22:
 			case RTL_GIGA_MAC_VER_26:
 				netif_stop_queue(dev);
 				rtl8169_tx_timeout(dev);
@@ -5835,6 +5834,7 @@ static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
 			case RTL_GIGA_MAC_VER_31:
 			/* Experimental science. Pktgen proof. */
 			case RTL_GIGA_MAC_VER_12:
+			case RTL_GIGA_MAC_VER_22:
 			case RTL_GIGA_MAC_VER_25:
 				if (status == RxFIFOOver)
 					goto done;


Traffic may stop flowing though. The patch below should be better:

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 6f06aa1..54be9e1 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -5820,8 +5820,7 @@ static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
 			case RTL_GIGA_MAC_VER_11:
 			case RTL_GIGA_MAC_VER_22:
 			case RTL_GIGA_MAC_VER_26:
-				netif_stop_queue(dev);
-				rtl8169_tx_timeout(dev);
+				rtl8169_schedule_work(dev, rtl8169_reset_task);
 				goto done;
 			/* Testers needed. */
 			case RTL_GIGA_MAC_VER_17:

-- 
Ueimor
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