netdev - Re: [PATCH net v2 2/2] iavf: remove active_cvlans and active

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Date:   Sun, 9 Apr 2023 13:40:55 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Tony Nguyen <anthony.l.nguyen@...el.com>
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, netdev@...r.kernel.org,
        Ahmed Zaki <ahmed.zaki@...el.com>,
        Rafal Romanowski <rafal.romanowski@...el.com>
Subject: Re: [PATCH net v2 2/2] iavf: remove active_cvlans and active_svlans
 bitmaps

On Fri, Apr 07, 2023 at 02:07:30PM -0700, Tony Nguyen wrote:
> From: Ahmed Zaki <ahmed.zaki@...el.com>
> 
> The VLAN filters info is currently being held in a list and 2 bitmaps
> (active_cvlans and active_svlans). We are experiencing some racing where
> data is not in sync in the list and bitmaps. For example, the VLAN is
> initially added to the list but only when the PF replies, it is added to
> the bitmap. If a user adds many V2 VLANS before the PF responds:
> 
>     while [ $((i++)) ]
>         ip l add l eth0 name eth0.$i type vlan id $i
> 
> we might end up with more VLAN list entries than the designated limit.
> Also, The "ip link show" will show more links added than the PF limit.
> 
> On the other and, the bitmaps are only used to check the number of VLAN
> filters and to re-enable the filters when the interface goes from DOWN to
> UP.
> 
> This patch gets rid of the bitmaps and uses the list only. To do that,
> the states of the VLAN filter are modified:
> 1 - IAVF_VLAN_REMOVE: the entry needs to be totally removed after informing
>   the PF. This is the "ip link del eth0.$i" path.
> 2 - IAVF_VLAN_DISABLE: (new) the netdev went down. The filter needs to be
>   removed from the PF and then marked INACTIVE.
> 3 - IAVF_VLAN_INACTIVE: (new) no PF filter exists, but the user did not
>   delete the VLAN.
> 
> Fixes: 48ccc43ecf10 ("iavf: Add support VIRTCHNL_VF_OFFLOAD_VLAN_V2 during netdev config")
> Signed-off-by: Ahmed Zaki <ahmed.zaki@...el.com>
> Tested-by: Rafal Romanowski <rafal.romanowski@...el.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
> ---
>  drivers/net/ethernet/intel/iavf/iavf.h        |  7 +--
>  drivers/net/ethernet/intel/iavf/iavf_main.c   | 40 +++++++----------
>  .../net/ethernet/intel/iavf/iavf_virtchnl.c   | 45 ++++++++++---------
>  3 files changed, 45 insertions(+), 47 deletions(-)
> 

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...dia.com>