Re: [dpdk-dev] i40e igb_uio: reset pci on process exit

[Gregory Etelson <gregory@weka.io>]

I did not look into VFIO driver yet

Regards,
Gregory

On Friday, 26 May 2017 18:53:21 IDT Stephen Hemminger wrote:
> On Fri, 26 May 2017 09:17:33 +0300
> Gregory Etelson <gregory@weka.io> wrote:
> 
> > Thank you.
> > 
> > Regards,
> > Gregory
> > 
> > On Friday, 26 May 2017 09:05:11 IDT Shijith Thotton wrote:
> > > On Fri, May 26, 2017 at 07:30:58AM +0300, Gregory Etelson wrote:
> > > 
> > > Hi Gregory,
> > > 
> > > The patch is useful for LiquidIO PMD as we can avoid VF FLR request to
> > > PF. One comment inline..
> > > 
> > > [..]
> > > > > >  
> > > > > > +static int
> > > > > > +igbuio_pci_release(struct uio_info *info, struct inode *inode)
> > > > > > +{
> > > > > > +       int ret;
> > > > > > +       struct rte_uio_pci_dev *udev = info->priv;
> > > > > > +       struct pci_dev *dev = udev->pdev;
> > > > > > +       ret = __pci_reset_function(dev);
> > > 
> > > s/__pci_reset_function/pci_reset_function
> > > 
> > > > > > +       dev_info(&dev->dev, "pci_reset_function %s \n",
> > > > > > +                 ret == 0 ? "succeded" : "failed");
> > > > > > +       return 0;
> > > > > > +}
> > > [..]
> > > 
> > > Thanks,
> > > Shijith
> > > 
> > 
> 
> What does VFIO do?
> 
> It looks like in vfio case pci_enable is held off until open and pci_disable is done
> on close. There are other things that may need to be done to make close work
> correctly. Like turning of msix. Also reset may not always be possible.
>