Re: [dpdk-dev] [PATCH 2/3] usertools: add hv_uio_setup script

[Stephen Hemminger <stephen@networkplumber.org>]

On Thu, 05 Apr 2018 23:13:54 +0200
Thomas Monjalon <thomas@monjalon.net> wrote:

> 05/04/2018 23:03, Stephen Hemminger:
> > On Thu, 05 Apr 2018 22:43:39 +0200
> > Thomas Monjalon <thomas@monjalon.net> wrote:
> >   
> > > 05/04/2018 21:13, Stephen Hemminger:  
> > > > Small script to rebind netvsc kernel device to Hyper-V
> > > > networking PMD. It could be integrated in dpdk-bind, but dpdk-bind
> > > > is focused on PCI, and that would get messy.
> > > > 
> > > > Eventually, this functionality will be built into netvsc driver
> > > > (see vdev_netvsc as an example).    
> > > 
> > > I believe we should avoid creating such script.
> > > The direction to go, for hotplug, is to remove dpdk-devbind.py,
> > > and implement kernel binding in PMDs (with EAL helpers).
> > > 
> > > In order to make this change happen, we should not
> > > add this hv_uio_setup.sh script.  
> > 
> > Yes, this is a temporary script like dpdk-bind, want to get rid of it
> > and do everything inside driver. That is the next step.  
> 
> If this is temporary, it is a step in the wrong direction which
> could confuse users.
> 
> If it becomes definitive (design discussion in progress), then it should
> be merged in dpdk-devbind.py.

Right now PCI does it the same way. It doesn't have a good cold plug interface.
The whole PCI probe logic expects that the device will have a vfio/uio already
bound.

When PCI is fixed, then VMBUS can be changed to the same thing.