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

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Date:	Fri, 17 Apr 2015 15:12:08 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	konrad.wilk@...cle.com
Cc:	mchan@...adcom.com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, Ian.Jackson@...citrix.com,
	prashant@...adcom.com, cascardo@...ux.vnet.ibm.com,
	boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
	vyasevich@...il.com, xen-devel@...ts.xensource.com,
	netdev@...r.kernel.org, siva.kallam@...adcom.com,
	sanjeevb@...adcom.com
Subject: Re: tg3 NIC driver bug in 3.14.x under Xen [and 3 more messages]

From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Date: Fri, 17 Apr 2015 15:04:48 -0400

> From 9e417af099e3cee2b219ab28ffc1e96b0564b213 Mon Sep 17 00:00:00 2001
> From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Date: Fri, 17 Apr 2015 14:55:47 -0400
> Subject: [PATCH] config: Enable NEED_DMA_MAP_STATE when SWIOTLB is selected
> 
> A huge amount of NIC drivers use the DMA API, however if compiled
> under 32-bit an very important part of the DMA API can be ommitted leading
> to the drivers not working at all (especially if used with
> 'swiotlb=force iommu=soft').
> 
> As Prashant Sreedharan explains it: "the driver [tg3] uses
> DEFINE_DMA_UNMAP_ADDR(), dma_unmap_addr_set() to keep a copy of the dma
> "mapping" and dma_unmap_addr() to get the "mapping" value. On most of
> the platforms this is a no-op, but ... with "iommu=soft and
> swiotlb=force" this house keeping is required, ... otherwise
> we pass 0 while calling pci_unmap_/pci_dma_sync_ instead of the
> DMA address."
> 
> As such enable this even when using 32-bit kernels.
> 
> Reported-by: Ian Jackson <Ian.Jackson@...citrix.com>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

Acked-by: David S. Miller <davem@...emloft.net>
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