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Date:	Thu, 30 Jan 2014 19:54:30 +0000
From:	Paul Zimmerman <paulz@...opsys.com>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	David Laight <David.Laight@...LAB.COM>
CC:	"renevant@...ernode.on.net" <renevant@...ernode.on.net>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Mark Lord <mlord@...ox.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Help testing for USB ethernet/xHCI regression

> From: linux-usb-owner@...r.kernel.org [mailto:linux-usb-owner@...r.kernel.org] On Behalf Of Sarah Sharp
> Sent: Thursday, January 30, 2014 10:44 AM
> To: David Laight
> Cc: renevant@...ernode.on.net; linux-usb@...r.kernel.org; Mark Lord; Greg Kroah-Hartman;
> netdev@...r.kernel.org
> Subject: Re: Help testing for USB ethernet/xHCI regression
> 
> On Thu, Jan 30, 2014 at 09:44:53AM +0000, David Laight wrote:
> > From: Sarah Sharp
> > > > Current issue is when plugging in the ax88179 there is lag when bringing the
> > > > interface up and a bunch of kernel messages:
> 
> > > > [   79.481028] IPv6: ADDRCONF(NETDEV_UP): enp7s0u1: link is not ready
> > > > [   82.210721] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1
> > > > [   82.338947] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1
> > > > [   82.467148] ax88179_178a 2-1:1.0 enp7s0u1: kevent 4 may have been dropped
> > > > [   82.470028] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1
> > > > [   82.595364] ax88179_178a 2-1:1.0 enp7s0u1: kevent 4 may have been dropped
> > > > [   82.598312] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1
> > > > [   82.723580] ax88179_178a 2-1:1.0 enp7s0u1: kevent 4 may have been dropped
> > > > [   82.726487] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1
> > > > [   82.851796] ax88179_178a 2-1:1.0 enp7s0u1: kevent 4 may have been dropped
> > > > [   82.854642] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1
> 
> > >
> > > With which kernel?
> >
> > I saw similar issues testing some patches yesterday.
> > Both with the ax179_178a and smsx95xx cards (connected to xhci).
> > My kernel claims to be 3.13.0-dsl+ but it is lying since it was
> > updated from linus's tree earlier this week.
> > I'd not seen any similar delays until the last week or so.
> 
> I see a report that these types of errors have been seen since the 3.11
> kernel:
> 
> http://marc.info/?l=linux-usb&m=139105963723745&w=2
> 
> Since the USB ethernet scatter-gather support wasn't added until the
> 3.12 kernel, it's unlikely that the xHCI TD fragment issue is actually
> the root cause.
> 
> The interesting piece of information in that report is that when the USB
> 3.0 device falls back to USB 2.0 speeds under xHCI, it works.
> 
> > The xhci controller I'm using is the Intel 'Panther Point' 8086:1e31
> > rev 4 (also says 8086:1e2d and 8086:1e26).
> 
> That's the host I have as well.  I've been able to find an ASIX device
> with the right chipset, so I'm going to poke around at what's happening
> at the USB 3.0 bus level.

Hi Sarah,

Can you give a pointer to where we could buy one of these devices? I
would like to test this with our (Synopsys) xHCI controller as well.

-- 
Paul

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