Re: [PATCH net-next] net: hsr: Add support for MC filtering at the slave device

[Wojciech Drewek]

On 20.11.2023 12:01, Ravi Gunasekaran wrote:
> From: Murali Karicheri <m-karicheri2@xxxxxx>
> 
> When MC (multicast) list is updated by the networking layer due to a
> user command and as well as when allmulti flag is set, it needs to be
> passed to the enslaved Ethernet devices. This patch allows this
> to happen by implementing ndo_change_rx_flags() and ndo_set_rx_mode()
> API calls that in turns pass it to the slave devices using
> existing API calls.
> 
> Signed-off-by: Murali Karicheri <m-karicheri2@xxxxxx>
> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@xxxxxx>
> ---

One small nit, besides that:
Reviewed-by: Wojciech Drewek <wojciech.drewek@xxxxxxxxx>

>  net/hsr/hsr_device.c | 67 +++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 66 insertions(+), 1 deletion(-)
> 
> diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
> index 306f942c3b28..4e8f4a3cefbf 100644
> --- a/net/hsr/hsr_device.c
> +++ b/net/hsr/hsr_device.c
> @@ -173,7 +173,24 @@ static int hsr_dev_open(struct net_device *dev)
>  
>  static int hsr_dev_close(struct net_device *dev)
>  {
> -	/* Nothing to do here. */
> +	struct hsr_port *port;
> +	struct hsr_priv *hsr;
> +
> +	hsr = netdev_priv(dev);
> +	hsr_for_each_port(hsr, port) {
> +		if (port->type == HSR_PT_MASTER)
> +			continue;
> +		switch (port->type) {
> +		case HSR_PT_SLAVE_A:
> +		case HSR_PT_SLAVE_B:
> +			dev_uc_unsync(port->dev, dev);
> +			dev_mc_unsync(port->dev, dev);
> +			break;
> +		default:
> +			break;
> +		}
> +	}
> +
>  	return 0;
>  }
>  
> @@ -404,12 +421,60 @@ void hsr_del_ports(struct hsr_priv *hsr)
>  		hsr_del_port(port);
>  }
>  
> +static void hsr_ndo_set_rx_mode(struct net_device *dev)

I wouldn't add "ndo" to the callback name, let's not stand out from other ndo callbacks here.

> +{
> +	struct hsr_port *port;
> +	struct hsr_priv *hsr;
> +
> +	hsr = netdev_priv(dev);
> +
> +	hsr_for_each_port(hsr, port) {
> +		if (port->type == HSR_PT_MASTER)
> +			continue;
> +		switch (port->type) {
> +		case HSR_PT_SLAVE_A:
> +		case HSR_PT_SLAVE_B:
> +			dev_mc_sync_multiple(port->dev, dev);
> +			dev_uc_sync_multiple(port->dev, dev);
> +			break;
> +		default:
> +			break;
> +		}
> +	}
> +}
> +
> +static void hsr_change_rx_flags(struct net_device *dev, int change)
> +{
> +	struct hsr_port *port;
> +	struct hsr_priv *hsr;
> +
> +	hsr = netdev_priv(dev);
> +
> +	hsr_for_each_port(hsr, port) {
> +		if (port->type == HSR_PT_MASTER)
> +			continue;
> +		switch (port->type) {
> +		case HSR_PT_SLAVE_A:
> +		case HSR_PT_SLAVE_B:
> +			if (change & IFF_ALLMULTI)
> +				dev_set_allmulti(port->dev,
> +						 dev->flags &
> +						 IFF_ALLMULTI ? 1 : -1);
> +			break;
> +		default:
> +			break;
> +		}
> +	}
> +}
> +
>  static const struct net_device_ops hsr_device_ops = {
>  	.ndo_change_mtu = hsr_dev_change_mtu,
>  	.ndo_open = hsr_dev_open,
>  	.ndo_stop = hsr_dev_close,
>  	.ndo_start_xmit = hsr_dev_xmit,
> +	.ndo_change_rx_flags = hsr_change_rx_flags,
>  	.ndo_fix_features = hsr_fix_features,
> +	.ndo_set_rx_mode = hsr_ndo_set_rx_mode,
>  };
>  
>  static struct device_type hsr_type = {
> 
> base-commit: 5a82d69d48c82e89aef44483d2a129f869f3506a