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

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Date:   Mon, 14 Aug 2017 11:46:36 +0930
From:   Joel Stanley <joel@....id.au>
To:     Samuel Mendoza-Jonas <sam@...dozajonas.com>
Cc:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Gavin Shan <gwshan@...ux.vnet.ibm.com>,
        Ratan K Gupta <ratagupt@...ibm.com>
Subject: Re: [PATCH net-next v2 3/3] ftgmac100: Support NCSI VLAN filtering
 when available

On Mon, Aug 14, 2017 at 10:59 AM, Samuel Mendoza-Jonas
<sam@...dozajonas.com> 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@...dozajonas.com>

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@....id.au>

> ---
> 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
>