netdev - Re: tg3 NIC driver bug in 3.14.x under Xen [and 3 more messages]

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Date:	Thu, 16 Apr 2015 09:39:13 -0700
From:	Michael Chan <mchan@...adcom.com>
To:	<cascardo@...ux.vnet.ibm.com>
CC:	Ian Jackson <Ian.Jackson@...citrix.com>,
	Prashant <prashant@...adcom.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	"Vlad Yasevich" <vyasevich@...il.com>,
	<xen-devel@...ts.xensource.com>, <netdev@...r.kernel.org>,
	"Siva Reddy (Siva) Kallam" <siva.kallam@...adcom.com>,
	Sanjeev Bansal <sanjeevb@...adcom.com>
Subject: Re: tg3 NIC driver bug in 3.14.x under Xen [and 3 more messages]

On Thu, 2015-04-16 at 09:24 -0300, cascardo@...ux.vnet.ibm.com wrote: 
> Yes, this looks like the driver is not syncing the DMA buffers. Unmap is
> supposed to synchronize as well.
> 

For small rx packets (< 256 bytes), we sync the DMA buffer before we
copy the data to another SKB.  For larger packets, we unmap the DMA
buffer.  Do we see the corruption in both cases?

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