netdev - Re: [PATCH] PCI: Update ACS quirk for more Intel 10G NICs

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Date:   Fri, 4 Aug 2017 08:28:13 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     'Bjorn Helgaas' <helgaas@...nel.org>,
        Roland Dreier <roland@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Emil Tantilov <emil.s.tantilov@...el.com>
Subject: Re: [PATCH] PCI: Update ACS quirk for more Intel 10G NICs

On Fri, 4 Aug 2017 13:28:32 +0000
David Laight <David.Laight@...LAB.COM> wrote:

> From: Bjorn Helgaas
> > Sent: 03 August 2017 22:49
> > On Thu, Jul 20, 2017 at 02:41:01PM -0700, Roland Dreier wrote:  
> > > From: Roland Dreier <roland@...estorage.com>
> > >
> > > Add one more variant of the 82599 plus the device IDs for X540 and X550
> > > variants.  Intel has confirmed that none of these devices does peer-to-peer
> > > between functions.  The X540 and X550 have added ACS capabilities in their
> > > PCI config space, but the ACS control register is hard-wired to 0 for both
> > > devices, so we still need the quirk for IOMMU grouping to allow assignment
> > > of individual SR-IOV functions.  
> ...
> > > --- a/drivers/pci/quirks.c
> > > +++ b/drivers/pci/quirks.c
> > > @@ -4335,12 +4335,33 @@ static const struct pci_dev_acs_enabled {
> > >  	{ PCI_VENDOR_ID_INTEL, 0x1507, pci_quirk_mf_endpoint_acs },
> > >  	{ PCI_VENDOR_ID_INTEL, 0x1514, pci_quirk_mf_endpoint_acs },
> > >  	{ PCI_VENDOR_ID_INTEL, 0x151C, pci_quirk_mf_endpoint_acs },
> > > +	{ PCI_VENDOR_ID_INTEL, 0x1528, pci_quirk_mf_endpoint_acs },
> > >  	{ PCI_VENDOR_ID_INTEL, 0x1529, pci_quirk_mf_endpoint_acs },
> > > +	{ PCI_VENDOR_ID_INTEL, 0x154A, pci_quirk_mf_endpoint_acs },  
> ...
> 
> That list is looking a bit long.
> Is it possible to run-time determine that the ACS control register is hard wired
> to zero, and apply the quirk to all such devices.
> Or even changing to a (device & mask) == value test??

In fact, hard-wired ACS doesn't need a quirk at all, please see the
other thread of the discussion.  Thanks,

Alex