[dpdk-dev] [PATCH v2 0/3] ethdev: configure SR-IOV VF from host

Thomas Monjalon thomas at monjalon.net
Fri Nov 1 01:24:43 CET 2019


30/10/2019 10:24, Jerin Jacob:
> On Wed, Oct 30, 2019 at 12:52 PM Shahaf Shuler <shahafs at mellanox.com> wrote:
> > Wednesday, October 30, 2019 6:09 AM, Jerin Jacob:
> > > Subject: Re: [dpdk-dev] [PATCH v2 0/3] ethdev: configure SR-IOV VF from
> > > host
> > >
> > > On Wed, Oct 30, 2019 at 12:21 AM Thomas Monjalon
> > > <thomas at monjalon.net> wrote:
> > > >
> > > > In a virtual environment, the network controller may have to configure
> > > > some SR-IOV VF parameters for security reasons.
> > >
> > > Just to understand, Could you explain more details/examples for security
> > > reasons?
> > >
> > > >
> > > > When the PF (host port) is driven by DPDK (OVS-DPDK case), we face two
> > > > different cases:
> > > >     - driver is bifurcated (Mellanox case),
> > > >       so the VF can be configured via the kernel.
> > > >     - driver is on top of UIO or VFIO, so DPDK API is required,
> > >
> > > Not true. Both UIO and VFIO are NOT allowed to create SRIOV VF from the
> > > PF device.
> > > It is only allowed through igb-uio out of tree driver without iommu support.
> >
> > Per my understanding Thomas proposal is not to create the VFs
> > from the PF device. it is to configure their network attributes
> > from the PF after they have been created.
> 
> Yes. My question is without creating the VF, How do you control them?

We can create the VF via the kernel PF driver, before binding the PF to VFIO.




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