linux-kernel - Re: [PATCH net-next v3 5/6] net: dsa: qca: ar9331: add bridge support

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Message-ID: <20210802145529.5k57qhsp7i43wmff@skbuf>
Date:   Mon, 2 Aug 2021 17:55:29 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH net-next v3 5/6] net: dsa: qca: ar9331: add bridge support

On Mon, Aug 02, 2021 at 03:10:36PM +0200, Oleksij Rempel wrote:
> This switch is providing forwarding matrix, with it we can configure
> individual bridges. Potentially we can configure more than one not VLAN
> based bridge on this HW.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/net/dsa/qca/ar9331.c | 53 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 53 insertions(+)
> 
> diff --git a/drivers/net/dsa/qca/ar9331.c b/drivers/net/dsa/qca/ar9331.c
> index d726d2f223ea..a0324fed2136 100644
> --- a/drivers/net/dsa/qca/ar9331.c
> +++ b/drivers/net/dsa/qca/ar9331.c
> @@ -40,6 +40,7 @@
>   */
>  
>  #include <linux/bitfield.h>
> +#include <linux/if_bridge.h>
>  #include <linux/module.h>
>  #include <linux/of_irq.h>
>  #include <linux/of_mdio.h>
> @@ -1093,6 +1094,56 @@ static int ar9331_sw_set_ageing_time(struct dsa_switch *ds,
>  				  val);
>  }
>  
> +static int ar9331_sw_port_bridge_mod(struct dsa_switch *ds, int port,
> +				     struct net_device *br, bool join)
> +{
> +	struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
> +	struct regmap *regmap = priv->regmap;

Reverse Christmas tree notation..

> +	int port_mask = BIT(dsa_to_port(ds, port)->cpu_dp->index);

Could you use dsa_upstream_port(ds, port) instead of raw access to cpu_dp?
Or alternatively, you can add another condition in your "for" loop, for
dsa_is_cpu_port(ds, port) => port_mask |= BIT(i);

> +	int i, ret;
> +	u32 val;
> +
> +	for (i = 0; i < ds->num_ports; i++) {
> +		if (dsa_to_port(ds, i)->bridge_dev != br)
> +			continue;
> +
> +		if (!dsa_is_user_port(ds, port))
> +			continue;

Only user ports can have a ->bridge_dev pointer populated in the first place.
Also, did you mean dsa_is_user_port(ds, i)? The "port" variable is an
invariant as far as this loop is concerned.

> +
> +		val = FIELD_PREP(AR9331_SW_PORT_VLAN_PORT_VID_MEMBER, BIT(port));
> +		ret = regmap_set_bits(regmap, AR9331_SW_REG_PORT_VLAN(i), val);
> +		if (ret)
> +			goto error;
> +
> +		if (join && i != port)
> +			port_mask |= BIT(i);
> +	}
> +
> +	val = FIELD_PREP(AR9331_SW_PORT_VLAN_PORT_VID_MEMBER, port_mask);
> +	ret = regmap_update_bits(regmap, AR9331_SW_REG_PORT_VLAN(port),
> +				 AR9331_SW_PORT_VLAN_PORT_VID_MEMBER, val);
> +	if (ret)
> +		goto error;
> +
> +	return 0;
> +error:
> +	dev_err(priv->dev, "%s: error: %i\n", __func__, ret);
> +
> +	return ret;
> +}
> +
> +static int ar9331_sw_port_bridge_join(struct dsa_switch *ds, int port,
> +				      struct net_device *br)
> +{
> +	return ar9331_sw_port_bridge_mod(ds, port, br, true);
> +}
> +
> +static void ar9331_sw_port_bridge_leave(struct dsa_switch *ds, int port,
> +					struct net_device *br)
> +{
> +	ar9331_sw_port_bridge_mod(ds, port, br, false);
> +}
> +
>  static const struct dsa_switch_ops ar9331_sw_ops = {
>  	.get_tag_protocol	= ar9331_sw_get_tag_protocol,
>  	.setup			= ar9331_sw_setup,
> @@ -1109,6 +1160,8 @@ static const struct dsa_switch_ops ar9331_sw_ops = {
>  	.port_mdb_add           = ar9331_sw_port_mdb_add,
>  	.port_mdb_del           = ar9331_sw_port_mdb_del,
>  	.set_ageing_time	= ar9331_sw_set_ageing_time,
> +	.port_bridge_join	= ar9331_sw_port_bridge_join,
> +	.port_bridge_leave	= ar9331_sw_port_bridge_leave,
>  };
>  
>  static irqreturn_t ar9331_sw_irq(int irq, void *data)
> -- 
> 2.30.2
>