netdev - RE: [PATCH] usb: xhci: Link TRB must not occur with a USB payload burst.

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Message-ID: <1384959827.8604.141.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 20 Nov 2013 07:03:47 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org
Subject: RE: [PATCH] usb: xhci: Link TRB must not occur with a USB payload
 burst.

On Wed, 2013-11-20 at 09:36 +0000, David Laight wrote:

> Ben said the largest number of fragments from the current network
> stack will be 17, and that none of them will cross 32k boundaries.
> So the network stack won't send down long SG lists.

Please note that skb->head itself _might_ cross a 32K or 64K boundary :

skb->head is kmalloc() provided, and SLUB can be tweaked
(slub_max_order) to use very high order pages.



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