netdev - Re: [net-next 08/14] pci: Add SRIOV helper function to determine if VFs are assigned to guest

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Date:	Mon, 22 Apr 2013 09:13:26 -0700
From:	Alexander Duyck <alexander.h.duyck@...el.com>
To:	Gavin Shan <shangw@...ux.vnet.ibm.com>
CC:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net,
	Bjorn Helgaas <bhelgaas@...gle.com>, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [net-next 08/14] pci: Add SRIOV helper function to determine
 if VFs are assigned to guest

On 04/20/2013 10:14 PM, Gavin Shan wrote:
> On Sat, Apr 20, 2013 at 08:31:28PM -0700, Jeff Kirsher wrote:
>> On Sat, 2013-04-20 at 02:49 -0700, Jeff Kirsher wrote:
>>> From: Alexander Duyck <alexander.h.duyck@...el.com>
>>>
>>> This function is meant to add a helper function that will determine if a PF
>>> has any VFs that are currently assigned to a guest.  We currently have been
>>> implementing this function per driver, and going forward I would like to avoid
>>> that by making this function generic and using this helper.
>>>
>>> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
>>> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
>> Adding linux-pci mailing list and Bjorn to the CC.
>>
>> Bjorn- David Miller needs a signoff by PCI maintainer. 
>>
>>> ---
>>>  drivers/pci/iov.c   | 41 +++++++++++++++++++++++++++++++++++++++++
>>>  include/linux/pci.h |  5 +++++
>>>  2 files changed, 46 insertions(+)
>>>
>>> diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
>>> index ee599f2..fd99720 100644
>>> --- a/drivers/pci/iov.c
>>> +++ b/drivers/pci/iov.c
>>> @@ -729,6 +729,47 @@ int pci_num_vf(struct pci_dev *dev)
>>>  EXPORT_SYMBOL_GPL(pci_num_vf);
>>>  
>>>  /**
>>> + * pci_vfs_assigned - returns number of VFs are assigned to a guest
>>> + * @dev: the PCI device
>>> + *
>>> + * Returns number of VFs belonging to this device that are assigned to a guest.
>>> + * If device is not a physical function returns -ENODEV.
>>> + */
>>> +int pci_vfs_assigned(struct pci_dev *dev)
>>> +{
>>> +	struct pci_dev *vfdev;
>>> +	unsigned int vfs_assigned = 0;
>>> +	unsigned short dev_id;
>>> +
>>> +	/* only search if we are a PF */
>>> +	if (!dev->is_physfn)
>>> +		return -ENODEV;
> I think it's more reasonable to return zero here?

I suppose that is true, it would be more in keeping with how pci_num_vf
works so I will make that change.

Thanks,

Alex
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