netdev - RE: [PATCH 1/2 v2] usbnet: fix bad header length bug

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Date:	Mon, 10 Feb 2014 12:39:07 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Oliver Neukum' <oliver@...kum.org>,
	Emil Goode <emilgoode@...il.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Ming Lei <ming.lei@...onical.com>,
	Mark Brown <broonie@...aro.org>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Glen Turner <gdt@....id.au>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2 v2] usbnet: fix bad header length bug

From: Oliver Neukum
> <censored>. Oh well. But how about merging it with FLAG_MULTI_PACKET?
> I really don't want to add more flags. There is a point where enough
> flags make absurd having a common code. We are closing in on that point.

Any sub-driver that supports multi-packet either has to use stupidly
long URB and/or set the rx_urb_size to a multiple of the usb transfer
size.

It will also have to detect illegal short headers.

Actually it might be worth double-checking the encapsulations used.
IIRC the ax88179_178a uses different headers for tx and rx.
So there might be some that support multi-packet but still have
a short(ish) limit on the bulk receive size (before the short fragment).

I'm sat at the wrong desk to look at the code...

	David