netdev - Re: [PATCH] xen/netback: Calculate the number of SKB slots required correctly

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Message-Id: <20120524.162117.2167559109226305167.davem@davemloft.net>
Date:	Thu, 24 May 2012 16:21:17 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	simon.graham@...rix.com
Cc:	Ian.Campbell@...rix.com, konrad.wilk@...cle.com,
	xen-devel@...ts.xensource.com, netdev@...r.kernel.org,
	bhutchings@...arflare.com, adnan.misherfi@...cle.com
Subject: Re: [PATCH] xen/netback: Calculate the number of SKB slots
 required correctly

From: Simon Graham <simon.graham@...rix.com>
Date: Thu, 24 May 2012 12:26:07 -0400

> When calculating the number of slots required for a packet header, the code
> was reserving too many slots if the header crossed a page boundary. Since
> netbk_gop_skb copies the header to the start of the page, the count of
> slots required for the header should be based solely on the header size.
> 
> This problem is easy to reproduce if a VIF is bridged to a USB 3G modem
> device as the skb->data value always starts near the end of the first page.
> 
> Signed-off-by: Simon Graham <simon.graham@...rix.com>

Applied.
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