netdev - Re: [PATCH] e1000: Reset rx ring index on receive overrun

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Message-ID: <20120518001202.GN683@type.famille.thibault.fr>
Date:	Fri, 18 May 2012 02:12:02 +0200
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Cc:	"Dave, Tushar N" <tushar.n.dave@...el.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>,
	"Skidmore, Donald C" <donald.c.skidmore@...el.com>,
	"Rose, Gregory V" <gregory.v.rose@...el.com>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	"Duyck, Alexander H" <alexander.h.duyck@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Pirko <jpirko@...hat.com>,
	Dean Nelson <dnelson@...hat.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] e1000: Reset rx ring index on receive overrun

Brandeburg, Jesse, le Thu 17 May 2012 17:04:04 -0700, a écrit :
> On Thu, 17 May 2012, Samuel Thibault wrote:
> 
> > Samuel Thibault, le Fri 18 May 2012 01:28:21 +0200, a écrit :
> > > Dave, Tushar N, le Thu 17 May 2012 23:22:31 +0000, a écrit :
> > > > I am interested in to see if you have actual test case and more 
> > > > importantly test data that shows that kernel and device indexes are 
> > > > not synchronized any more.
> > > 
> > > Well, it's not with an actual physical device, but with the kvm
> > > emulation.
> > 
> > BTW, it also happens easily when request_irq takes some time to
> > complete: since we enable E1000_TCTL_EN before that, the card can have
> > time to fill the ring before irqs are processed.
> 
> I think there may well be a bug in the implementation in kvm.  The 
> hardware doesn't have this bug.

How does it avoid filling the ring?  What is the purpose of the RXO flag
if it does avoid them?

Samuel
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