Re: [PATCH net-next v2 3/3] ftgmac100: Support NCSI VLAN filtering when available

[Joel Stanley]

On Mon, Aug 14, 2017 at 10:59 AM, Samuel Mendoza-Jonas
<sam@xxxxxxxxxxxxxxxx> wrote:
> Register the ndo_vlan_rx_{add,kill}_vid callbacks and set the
> NETIF_F_HW_VLAN_CTAG_FILTER if NCSI is available.
> This allows the VLAN core to notify the NCSI driver when changes occur
> so that the remote NCSI channel can be properly configured to filter on
> the set VLAN tags.
>
> Signed-off-by: Samuel Mendoza-Jonas <sam@xxxxxxxxxxxxxxxx>

I'm not a vlan expert, so I asked why this was only being set when
doing NCSI. The answer was:

> There is no point setting it when not doing ncsi. The HW doesn't have a
> filter in that case (we do have HW vlan tag extraction and injection,
> which my driver supports, but that's different flags).

Reviewed-by: Joel Stanley <joel@xxxxxxxxx>

> ---
> v2: Moved ftgmac100 change into same patch and reordered
>
>  drivers/net/ethernet/faraday/ftgmac100.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
> index 34dae51effd4..05fe7123d5ae 100644
> --- a/drivers/net/ethernet/faraday/ftgmac100.c
> +++ b/drivers/net/ethernet/faraday/ftgmac100.c
> @@ -1623,6 +1623,8 @@ static const struct net_device_ops ftgmac100_netdev_ops = {
>  #ifdef CONFIG_NET_POLL_CONTROLLER
>         .ndo_poll_controller    = ftgmac100_poll_controller,
>  #endif
> +       .ndo_vlan_rx_add_vid    = ncsi_vlan_rx_add_vid,
> +       .ndo_vlan_rx_kill_vid   = ncsi_vlan_rx_kill_vid,
>  };
>
>  static int ftgmac100_setup_mdio(struct net_device *netdev)
> @@ -1837,6 +1839,9 @@ static int ftgmac100_probe(struct platform_device *pdev)
>                 NETIF_F_GRO | NETIF_F_SG | NETIF_F_HW_VLAN_CTAG_RX |
>                 NETIF_F_HW_VLAN_CTAG_TX;
>
> +       if (priv->use_ncsi)
> +               netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER;
> +
>         /* AST2400  doesn't have working HW checksum generation */
>         if (np && (of_device_is_compatible(np, "aspeed,ast2400-mac")))
>                 netdev->hw_features &= ~NETIF_F_HW_CSUM;
> --
> 2.14.0
>