linux-kernel - Re: [PATCH] PCI: Intel 10G NIC ACS quirks

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Message-ID: <20140929194855.GA15712@google.com>
Date:	Mon, 29 Sep 2014 13:48:55 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	John Ronciak <john.ronciak@...el.com>
Subject: Re: [PATCH] PCI: Intel 10G NIC ACS quirks

On Fri, Sep 26, 2014 at 05:07:59PM -0600, Alex Williamson wrote:
> Intel has verified there is no peer-to-peer between functions for the
> below selection of 82598, 82599, and X520 10G NICs.  These NICs lack
> an ACS capability, so we're not able to determine this isolation
> without the help of quirks.  Generalize the Solarflare quirk and add
> these.
> 
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> Cc: John Ronciak <john.ronciak@...el.com>

Applied to pci/virtualization for v3.18, thanks!

> ---
> 
>  drivers/pci/quirks.c |   34 ++++++++++++++++++++++++++++------
>  1 file changed, 28 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 95239e0..b6c6500 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -3635,14 +3635,16 @@ static int pci_quirk_intel_pch_acs(struct pci_dev *dev, u16 acs_flags)
>  	return acs_flags & ~flags ? 0 : 1;
>  }
>  
> -static int pci_quirk_solarflare_acs(struct pci_dev *dev, u16 acs_flags)
> +static int pci_quirk_mf_endpoint_acs(struct pci_dev *dev, u16 acs_flags)
>  {
>  	/*
>  	 * SV, TB, and UF are not relevant to multifunction endpoints.
>  	 *
> -	 * Solarflare indicates that peer-to-peer between functions is not
> -	 * possible, therefore RR, CR, and DT are not implemented.  Mask
> -	 * these out as if they were clear in the ACS capabilities register.
> +	 * Multifunction devices are only required to implement RR, CR, and DT
> +	 * in their ACS capability if they support peer-to-peer transactions.
> +	 * Devices matching this quirk have been verified by the vendor to not
> +	 * perform peer-to-peer with other functions, allowing us to mask out
> +	 * these bits as if they were unimplemented in the ACS capability.
>  	 */
>  	acs_flags &= ~(PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR |
>  		       PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_DT);
> @@ -3661,8 +3663,28 @@ static const struct pci_dev_acs_enabled {
>  	{ PCI_VENDOR_ID_ATI, 0x439d, pci_quirk_amd_sb_acs },
>  	{ PCI_VENDOR_ID_ATI, 0x4384, pci_quirk_amd_sb_acs },
>  	{ PCI_VENDOR_ID_ATI, 0x4399, pci_quirk_amd_sb_acs },
> -	{ PCI_VENDOR_ID_SOLARFLARE, 0x0903, pci_quirk_solarflare_acs },
> -	{ PCI_VENDOR_ID_SOLARFLARE, 0x0923, pci_quirk_solarflare_acs },
> +	{ PCI_VENDOR_ID_SOLARFLARE, 0x0903, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_SOLARFLARE, 0x0923, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x10C6, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x10DB, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x10DD, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x10E1, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x10F1, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x10F7, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x10F8, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x10F9, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x10FA, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x10FB, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x10FC, pci_quirk_mf_endpoint_acs },
> +	{ 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, 0x1529, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x152A, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x154D, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x154F, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x1551, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_INTEL, 0x1558, pci_quirk_mf_endpoint_acs },
>  	{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_intel_pch_acs },
>  	{ 0 }
>  };
> 
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