Re: [dpdk-dev] How do you setup a VM in Promiscuous Mode using PCI Pass-Through (SR-IOV)?

[Bruce Richardson <bruce.richardson@intel.com>]

On Fri, May 15, 2015 at 12:54:19PM +0000, Assaad, Sami (Sami) wrote:
> Thanks Bruce for your reply.
> 
> Yes, your idea of bringing the PF into the VM looks like an option. However, how do you configure the physical interfaces within the VM supporting SRIOV?
> I always believed that the VM needed to be associated with a virtual/emulated interface card. With your suggestion, I would actually configure the physical interface card/non-emulated within the VM.
> 
> If you could provide me some example configuration commands, it would be really appreciated. 
> 

You'd pass in the PF in the same way as the VF, just skip all the steps
creating the VF on the host. To the system and hypervisor, both are just PCI
devices!

As for configuration, the setup and configuration of the PF in the guest is
exactly the same as on the host - it's the same hardware with the same PCI bars.
It's the IOMMU on your platform that takes care of memory isolation and address
translation and that should work with either PF or VF.

Regards,
/Bruce

> Thanks in advance.
> 
> Best Regards,
> Sami.
> 
> -----Original Message-----
> From: Bruce Richardson [mailto:bruce.richardson@intel.com] 
> Sent: Friday, May 15, 2015 5:27 AM
> To: Stephen Hemminger
> Cc: Assaad, Sami (Sami); dev@dpdk.org
> Subject: Re: [dpdk-dev] How do you setup a VM in Promiscuous Mode using PCI Pass-Through (SR-IOV)?
> 
> On Thu, May 14, 2015 at 04:47:19PM -0700, Stephen Hemminger wrote:
> > On Thu, 14 May 2015 21:38:24 +0000
> > "Assaad, Sami (Sami)" <sami.assaad@alcatel-lucent.com> wrote:
> > 
> > > Hello,
> > > 
> > > My Hardware consists of the following:
> > >   - DL380 Gen 9 Server supporting two Haswell Processors (Xeon CPU E5-2680 v3 @ 2.50GHz)
> > >   - An x540 Ethernet Controller Card supporting 2x10G ports.
> > > 
> > > Software:
> > >   - CentOS 7 (3.10.0-229.1.2.el7.x86_64)
> > >   - DPDK 1.8
> > > 
> > > I want all the network traffic received on the two 10G ports to be transmitted to my VM. The issue is that the Virtual Function / Physical Functions have setup the internal virtual switch to only route Ethernet packets with destination MAC address matching the VM virtual interface MAC. How can I configure my virtual environment to provide all network traffic to the VM...i.e. set the virtual functions for both PCI devices in Promiscuous mode?
> > > 
> > > [ If a l2fwd-vf example exists, this would actually solve this 
> > > problem ... Is there a DPDK l2fwd-vf example available? ]
> > > 
> > > 
> > > Thanks in advance.
> > > 
> > > Best Regards,
> > > Sami Assaad.
> > 
> > This is a host side (not DPDK) issue.
> > 
> > Intel PF driver will not allow guest (VF) to go into promiscious mode 
> > since it would allow traffic stealing which is a security violation.
> 
> Could you maybe try passing the PF directly into the VM, rather than a VF based off it? Since you seem to want all traffic to go to the one VM, there seems little point in creating a VF on the device, and should let the VM control the whole NIC directly.
> 
> Regards,
> /Bruce