linux-kernel - Re: [PATCH] PCI: Make pci_find_upstream_pcie

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Date:	Wed, 09 Jan 2013 10:27:33 +0000
From:	Tadeusz Struk <tadeusz.struk@...el.com>
To:	Don Dutile <ddutile@...hat.com>
CC:	bhelgaas@...gle.com, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] PCI: Make pci_find_upstream_pcie_bridge() handle non
 PCIE VFs well

On 01/08/2013 05:05 PM, Don Dutile wrote:

> (a) no such thing as a non-PCIe VF -- all VFs
>     are PCIe-based.

The sriov spec says that a VF doesn't necessarily has to have PCIE cap:
"3.5 PCI Express Capability:
   ...
   PFs and VFs are required to implement this capability ... subject to
   the exceptions and additional requirements described below"

> (b) code says to return null if VF doesn't have PCIe cap,
>     but the code checks if pdev is VF and if PF is PCIe,
>     which it must be! ...

You are right, I should rather check if the VF is not a pcie.

> nack until a better &/or matching explanation of what
> the real problem is, and what the solution is trying to do.

The problem is that I do have a device where VFs are not PCIE and I get this nasty warning.
For now I have a workaround, but it would be nice it Linux would support non PCIE VFs.

Thanks,
T

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