netdev - RE: net/usb/ax88179_178a driver broken in linux-3.12

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B742F@saturn3.aculab.com>
Date:	Mon, 18 Nov 2013 13:32:17 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"David Laight" <David.Laight@...LAB.COM>,
	"Mark Lord" <mlord@...ox.com>,
	"Eric Dumazet" <eric.dumazet@...il.com>,
	"Ming Lei" <ming.lei@...onical.com>, <davem@...emloft.net>,
	<netdev@...r.kernel.org>
Subject: RE: net/usb/ax88179_178a driver broken in linux-3.12

> From: David Laight
> > On 13-11-17 01:56 PM, Mark Lord wrote:
> > > On 13-11-17 01:35 PM, Mark Lord wrote:
> > >> The USB3 network adapter locks up consistently for me here in 3.12,
> > >> but was working without issues in 3.11.x
> 
> The xhci driver is well broken in 3.12.

To correct myself...

The xhci driver has never correctly support scatter-gather requests.
In 3.12 code was added to usbnet to generate SG transmits, and to the
ax88179_178a driver to use them.
TCP segmentation offload was then enabled - with does generate
SG transfers.

SG transfers for 'disks' almost certainly work because the
fragment boundaries are 'adequately aligned'.

	David