linux-kernel - Re: igb and bnx2: "NETDEV WATCHDOG: transmit queue timed out" when skb has huge linear buffer

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Message-ID: <52F2A282.5040502@citrix.com>
Date:	Wed, 5 Feb 2014 20:43:46 +0000
From:	Andrew Cooper <andrew.cooper3@...rix.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>,
	Michael Chan <mchan@...adcom.com>
CC:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	"Peter P Waskiewicz Jr" <peter.p.waskiewicz.jr@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Tushar Dave <tushar.n.dave@...el.com>,
	Akeem G Abodunrin <akeem.g.abodunrin@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: igb and bnx2: "NETDEV WATCHDOG: transmit queue timed out" when
 skb has huge linear buffer

On 05/02/2014 20:23, Zoltan Kiss wrote:
> On 04/02/14 19:47, Michael Chan wrote:
>> On Fri, 2014-01-31 at 14:29 +0100, Zoltan Kiss wrote:
>>> [ 5417.275472] WARNING: at net/sched/sch_generic.c:255
>>> dev_watchdog+0x156/0x1f0()
>>> [ 5417.275474] NETDEV WATCHDOG: eth1 (bnx2): transmit queue 2 timed out
>>
>> The dump shows an internal IRQ pending on MSIX vector 2 which matches
>> the the queue number that is timing out.  I don't know what happened to
>> the MSIX and why the driver is not seeing it.  Do you see an IRQ error
>> message from the kernel a few seconds before the tx timeout message?
>
> I haven't seen any IRQ related error message. Note, this is on Xen
> 4.3.1. Now I have new results with a reworked version of the patch,
> unfortunately it still has this issue. Here is a bnx2 dump, lspci
> output and some Xen debug output (MSI and interrupt bindings, I have
> more if needed).

You need debug-keys 'Q' as well to map between the PCI devices and Xen IRQs

~Andrew
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