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

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Message-ID: <1391543271.4804.44.camel@LTIRV-MCHAN1.corp.ad.broadcom.com>
Date:	Tue, 4 Feb 2014 11:47:51 -0800
From:	Michael Chan <mchan@...adcom.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
CC:	Zoltan Kiss <zoltan.kiss@...aman.hu>,
	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 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?

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