[Intel-wired-lan] [next PATCH S80-V3 02/11] i40evf: fix mac filter removal timing issue

[Bowers, AndrewX]

> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces at osuosl.org] On
> Behalf Of Alice Michael
> Sent: Thursday, September 7, 2017 5:06 AM
> To: Michael, Alice <alice.michael at intel.com>; intel-wired-
> lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [next PATCH S80-V3 02/11] i40evf: fix mac filter
> removal timing issue
> 
> From: Alan Brady <alan.brady at intel.com>
> 
> Due to the asynchronous nature in which mac filters are added and deleted,
> there exists a bug in which filters are erroneously removed if removed then
> added again quickly.
> 
> The events are as such:
>     - filter marked for removal
>     - same filter is re-added before watchdog that cleans up filters
>     - we skip re-adding the filter because we have it already in the list
>     - watchdog filter cleanup kicks off and filter is removed
> 
> So when we were re-adding the same filter, it didn't actually get added
> because it already existed in the list, but was marked for removal and had yet
> to actually be removed.
> 
> This patch fixes the issue by making sure that when adding a filter, if we find
> it already existing in our list, make sure it is not marked to be removed.
> 
> Signed-off-by: Alan Brady <alan.brady at intel.com>
> ---
>  drivers/net/ethernet/intel/i40evf/i40evf_main.c | 2 ++
>  1 file changed, 2 insertions(+)

Tested-by: Andrew Bowers <andrewx.bowers at intel.com>