Re: Add a helper function in PCI IOV to get VF device

From: Jesse Barnes
Date: Tue Jun 08 2010 - 17:36:24 EST

On Tue, 1 Jun 2010 13:05:25 +0800
Frank Pan <frankpzh@xxxxxxxxx> wrote:

> Greetings,
> The motivation is make VF device visible to PF driver. PF driver
> may need this to access VF's PCI configuration.
> Another use case is in sysfs symbolic linking. Some of VF's sysfs
> entries are created by PF driver. For example, /sys/class/net/ethx/vfx
> in Intel 82576 NIC driver. Makeing a symbolic link from VF's pci device
> to this path also must be done in PF's driver.
> Currently, there is no hint about VF's bus/devfn in PF's pci_dev.
> The offset and stride entries(which are used to calculate bus/devfn
> of VF devices) in VF's PCI configuration is also invisible in PF's
> driver. So IMO this helper function is needed.
> Any reply is appreciated, THX.
> (ps: gmail will do line wrap/tab replace, use attachment instead to patch)

Per the discussion in this thread it sounds like this really has
nothing to do with sysfs and more to do with being a convenient API for

Is that correct? If so, and assuming there's not some other way of
getting this info from a driver, I'm ok with it, but it should be
submitted as part of a patchset including driver code that uses it.

Jesse Barnes, Intel Open Source Technology Center
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