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

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Date:	Mon, 28 May 2012 09:42:08 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	David Miller <davem@...emloft.net>
CC:	Simon Graham <simon.graham@...rix.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"bhutchings@...arflare.com" <bhutchings@...arflare.com>,
	"adnan.misherfi@...cle.com" <adnan.misherfi@...cle.com>
Subject: Re: [PATCH] xen/netback: Calculate the number of SKB slots required
 correctly

On Thu, 2012-05-24 at 21:21 +0100, David Miller wrote:
> 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.

Thanks both!

Ian.

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