netdev - Re: Help testing for USB ethernet/xHCI regression

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Date:	Thu, 30 Jan 2014 14:45:36 -0500
From:	Mark Lord <mlord@...ox.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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Help testing for USB ethernet/xHCI regression

On 14-01-30 01:44 PM, Sarah Sharp wrote:
..
> 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.

Could be due to something related to the max URB length:

USB 2.0 High-Speed: max URB length 512.
USB 3.0 Super-Speed: max URB length 1024.

Cheers
-- 
Mark Lord
Real-Time Remedies Inc.
mlord@...ox.com
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