netdev - RE: [Intel-wired-lan] [PATCH] ixgbe: Fix race when the VF driver does a reset

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Date:   Thu, 6 Dec 2018 22:48:18 +0000
From:   "Bowers, AndrewX" <andrewx.bowers@...el.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
Subject: RE: [Intel-wired-lan] [PATCH] ixgbe: Fix race when the VF driver
 does a reset

> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@...osl.org] On
> Behalf Of Ross Lagerwall
> Sent: Wednesday, December 5, 2018 5:54 AM
> To: netdev@...r.kernel.org; intel-wired-lan@...ts.osuosl.org
> Cc: Ross Lagerwall <ross.lagerwall@...rix.com>; David S. Miller
> <davem@...emloft.net>
> Subject: [Intel-wired-lan] [PATCH] ixgbe: Fix race when the VF driver does a
> reset
> 
> When the VF driver does a reset, it (at least the Linux one) writes to the
> VFCTRL register to issue a reset and then immediately sends a reset message
> using the mailbox API. This is racy because when the PF driver detects that
> the VFCTRL register reset pin has been asserted, it clears the mailbox
> memory. Depending on ordering, the reset message sent by the VF could be
> cleared by the PF driver. It then responds to the cleared message with a
> NACK which causes the VF driver to malfunction.
> Fix this by deferring clearing the mailbox memory until the reset message is
> received.
> 
> Fixes: 939b701ad633 ("ixgbe: fix driver behaviour after issuing VFLR")
> Signed-off-by: Ross Lagerwall <ross.lagerwall@...rix.com>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)

Tested-by: Andrew Bowers <andrewx.bowers@...el.com>