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Date: Fri, 10 May 2013 12:10:42 -0700 (PDT)
From: Bhavesh Davda <bhavesh@vmware.com>
To: Stephen Hemminger <stephen@networkplumber.org>
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Thread-Topic: rte_eth_dev_count() returns 0
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Cc: Henry Wang <wang_hr@neusoft.com>, dev@dpdk.org
Subject: Re: [dpdk-dev] rte_eth_dev_count() returns 0
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Hi Stephen,

I checked both our hypervisor code and with the experts who wrote and maintain the code, and we don't have any such limitation about not supporting SR-IOV if the motherboard or device doesn't support PCIe ASPM.

If you can point me to the Intel person(s) who gave you that information (offline, no need to make this public :)), we can make sure such FUD doesn't continue getting spread too far.

Thanks for making us aware of this FUD though.

--
Bhavesh Davda

----- Original Message -----
> From: "Stephen Hemminger" <stephen@networkplumber.org>
> To: "Bhavesh Davda" <bhavesh@vmware.com>
> Cc: "Henry Wang" <wang_hr@neusoft.com>, dev@dpdk.org
> Sent: Friday, May 10, 2013 11:44:50 AM
> Subject: Re: [dpdk-dev] rte_eth_dev_count() returns 0
> 
> On Fri, 10 May 2013 09:21:36 -0700 (PDT)
> Bhavesh Davda <bhavesh@vmware.com> wrote:
> 
> > Right: VMware has supported VMDirectPath passthrough since ESXi 4.0, on any
> > platform with an IOMMU (Intel VT-d) which is anything Nehalem Xeons or
> > newer.
> > 
> > I know this is a DPDK forum, but Stephen, if you know of specific
> > limitations of ESXi 5.1's SR-IOV support, please let me know and I'll make
> > sure we work on addressing them.
> 
> I had trouble getting it to work on a white box ASUS motherboard. It seems
> the MB didn't
> support PCIe power management ASPM. And Intel confirmed that was required by
> Vmware.
> Linux didn't care if ASPM wasn't available and worked fine with SR-IOV
>