netdev - RE: [net v2 3/8] ixgbe: fix vf lookup

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Date:	Thu, 9 Feb 2012 16:27:51 +0000
From:	"Rose, Gregory V" <gregory.v.rose@...el.com>
To:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>,
	"sassmann@...hat.com" <sassmann@...hat.com>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [net v2 3/8] ixgbe: fix vf lookup

> -----Original Message-----
> From: Kirsher, Jeffrey T
> Sent: Thursday, February 09, 2012 1:34 AM
> To: davem@...emloft.net
> Cc: Rose, Gregory V; netdev@...r.kernel.org; gospo@...hat.com;
> sassmann@...hat.com; stable@...r.kernel.org; Kirsher, Jeffrey T
> Subject: [net v2 3/8] ixgbe: fix vf lookup
> 
> From: Greg Rose <gregory.v.rose@...el.com>
> 
> Recent addition of code to find already allocated VFs failed to take
> account that systems with 2 or more multi-port SR-IOV capable controllers
> might have already enabled VFs.  Make sure that the VFs the function is
> finding are actually subordinate to the particular instance of the adapter
> that is looking for them and not subordinate to some device that has
> previously enabled SR-IOV.
> 
> This bug exists in 3.2 stable as well as 3.3 release candidates.
> 
> CC: stable@...r.kernel.org
> Reported-by: David Ahern <daahern@...co.com>
> Signed-off-by: Greg Rose <gregory.v.rose@...el.com>
> Tested-by: Robert E Garrett <robertX.e.garrett@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> index 8d8cdbc..b982710 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> @@ -67,7 +67,8 @@ static int ixgbe_find_enabled_vfs(struct ixgbe_adapter
> *adapter)
>  	vf_devfn = pdev->devfn + 0x80;
>  	pvfdev = pci_get_device(IXGBE_INTEL_VENDOR_ID, device_id, NULL);
>  	while (pvfdev) {
> -		if (pvfdev->devfn == vf_devfn)
> +		if (pvfdev->devfn == vf_devfn &&
> +		    (pvfdev->bus->number >= pdev->bus->number))
>  			vfs_found++;
>  		vf_devfn += 2;
>  		pvfdev = pci_get_device(IXGBE_INTEL_VENDOR_ID,
> --
> 1.7.7.6

It still has unneeded parenthesis around the second half of the if expression.  I'll fix that up in the next series of patches.  Same for the igb driver.

- Greg


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