linux-kernel - Re: SR-IOV problem with Intel 82599EB (not enough MMIO resources for SR-IOV)

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Message-ID: <CAErSpo4xn9t=4yXGLdPQMtUJF=n38tYrMutAoj7NCsLUzQEbcg@mail.gmail.com>
Date:	Fri, 9 Nov 2012 08:26:59 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Jason Gao <pkill.2012@...il.com>
Cc:	"Rose, Gregory V" <gregory.v.rose@...el.com>,
	"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>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>, linux-pci@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: SR-IOV problem with Intel 82599EB (not enough MMIO resources for SR-IOV)

[+ linux-pci, Yinghai]

On Thu, Nov 8, 2012 at 8:59 PM, Jason Gao <pkill.2012@...il.com> wrote:
>> 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?   .

Linux normally uses the resource assignments done by the BIOS, but it
is possible for the kernel to reassign those.  We don't have good
automatic support for that yet, but on a recent upstream kernel, you
can try "pci=realloc".  I doubt this option is in CentOS 6.3, though.

If an upstream kernel with "pci=realloc" still doesn't work, please
post the entire dmesg log.
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