linux-kernel - RE: [Intel-wired-lan] [PATCH 1/2] igb: Teardown SR-IOV before unregister

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Date:	Tue, 11 Aug 2015 02:11:57 +0000
From:	"Brown, Aaron F" <aaron.f.brown@...el.com>
To:	Alex Williamson <alex.williamson@...hat.com>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH 1/2] igb: Teardown SR-IOV before
	unregister_netdev()

> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@...ts.osuosl.org] On
> Behalf Of Alex Williamson
> Sent: Monday, July 27, 2015 4:19 PM
> To: intel-wired-lan@...ts.osuosl.org; Kirsher, Jeffrey T
> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [Intel-wired-lan] [PATCH 1/2] igb: Teardown SR-IOV before
> unregister_netdev()
> 
> When the .remove() callback for a PF is called, SR-IOV support for the
> device is disabled, which requires unbinding and removing the VFs.
> The VFs may be in-use either by the host kernel or userspace, such as
> assigned to a VM through vfio-pci.  In this latter case, the VFs may
> be removed either by shutting down the VM or hot-unplugging the
> devices from the VM.  Unfortunately in the case of a Windows 2012 R2
> guest, hot-unplug is broken due to the ordering of the PF driver
> teardown.  Disabling SR-IOV prior to unregister_netdev() avoids this
> issue.
> 
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> ---
>  drivers/net/ethernet/intel/igb/igb_main.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

Tested-by: Aaron Brown <aaron.f.brown@...el.com>
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