netdev - RE: SR-IOV problem with Intel 82599EB (not enough MMIO resources for SR-IOV)

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Message-ID: <A3A921390EAE4044940E99EBF13D97321AE2114C@FMSMSX104.amr.corp.intel.com>
Date:	Fri, 9 Nov 2012 18:08:00 +0000
From:	"Li, Sibai" <sibai.li@...el.com>
To:	"Rose, Gregory V" <gregory.v.rose@...el.com>,
	Jason Gao <pkill.2012@...il.com>
CC:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>, kvm <kvm@...r.kernel.org>
Subject: RE: SR-IOV problem with Intel 82599EB (not enough MMIO resources
 for SR-IOV)

Jason,

DellR710 with the latest BIOS should work fine for SR-IOV. My BIOS is v.6.3.0 and release date is 07/24/2012
Please check if you configured intel_iommu=on in the grub.conf file. 
If you did, check your kernel .config file under Device Drivers-> IOMMU Hardware support->enable Support for Intel IOMMU using DMA remapping Devices, enable Intel DMA Remapping Devices by Default, enable Support for Interrupt Remapping.

Thanks,
Sibai

> -----Original Message-----
> From: Rose, Gregory V
> Sent: Friday, November 09, 2012 9:16 AM
> To: Jason Gao; Li, Sibai
> Cc: Kirsher, Jeffrey T; linux-kernel; netdev; kvm
> Subject: RE: SR-IOV problem with Intel 82599EB (not enough MMIO resources
> for SR-IOV)
> 
> > -----Original Message-----
> > From: Jason Gao [mailto:pkill.2012@...il.com]
> > Sent: Thursday, November 08, 2012 8:00 PM
> > To: Rose, Gregory V
> > Cc: Kirsher, Jeffrey T; linux-kernel; netdev; kvm; e1000-
> > devel@...ts.sourceforge.net
> > Subject: Re: SR-IOV problem with Intel 82599EB (not enough MMIO
> > resources for SR-IOV)
> >
> > > The BIOS in your machine doesn't support SR-IOV.  You'll need to ask
> > > the
> > manufacturer for a BIOS upgrade, if in fact one is available.
> > Sometimes they're not.
> >
> > very thanks Greg,my server Dell R710 with latest BIOS version and
> > option for SR-IOV(SR-IOV Global Enable->Enabled)  opened,I'm confused
> > that Does
> > R710 provide full support for SR-IOV, kernel or  ixgbe driver's bug?
> > but I'm not sure where the problem lies,anyone has any
> > experience about this?   .
> 
> I use a Dell R710 for all my SR-IOV testing and it works fine but I had to acquire a
> special BIOS from Dell to get it to work.  As I said, you'll want to contact them
> and make sure you've got the correct BIOS.
> 
> The error you're seeing, "not enough MMIO resources" has been an issue with
> the BIOS 100% of the times that we've run into it.  In any case, it is NOT a driver
> bug.  The driver has nothing to do with allocation of MMIO space reservation for
> VF devices.  The message you're seeing pops up when the driver calls
> pci_enable_sriov().  There is nothing the driver can do to force that call to be
> successful.
> 
> I've added Sibai Li to this response.  She should be able to get the BIOS version
> string off of one of our working Dell R710s.
> 
> Sibai,
> 
> Could you please reply to this message with that information?
> 
> Thanks,
> 
> - Greg
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