netdev - Re: [PATCH net-next] net: dsa: rtl8366rb: support bridge offloading

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Date:   Mon, 15 Mar 2021 23:49:44 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     LGA1150 <dqfext@...il.com>
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>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH net-next] net: dsa: rtl8366rb: support bridge offloading

On Tue, Mar 16, 2021 at 01:01:44AM +0800, LGA1150 wrote:
> From: DENG Qingfang <dqfext@...il.com>
> 
> Use port isolation registers to configure bridge offloading.
> Remove the VLAN init, as we have proper CPU tag and bridge offloading
> support now.
> 
> Signed-off-by: DENG Qingfang <dqfext@...il.com>
> ---
> Changes since RFC:
>   Fix build error
> 
>  drivers/net/dsa/rtl8366rb.c | 71 +++++++++++++++++++++++++++++++++----
>  1 file changed, 65 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/dsa/rtl8366rb.c b/drivers/net/dsa/rtl8366rb.c
> index a89093bc6c6a..bbcfdd84f0e9 100644
> --- a/drivers/net/dsa/rtl8366rb.c
> +++ b/drivers/net/dsa/rtl8366rb.c
> @@ -300,6 +300,12 @@
>  #define RTL8366RB_INTERRUPT_STATUS_REG	0x0442
>  #define RTL8366RB_NUM_INTERRUPT		14 /* 0..13 */
>  
> +/* Port isolation registers */
> +#define RTL8366RB_PORT_ISO_BASE		0x0F08
> +#define RTL8366RB_PORT_ISO(pnum)	(RTL8366RB_PORT_ISO_BASE + (pnum))
> +#define RTL8366RB_PORT_ISO_EN		BIT(0)
> +#define RTL8366RB_PORT_ISO_PORTS_MASK	GENMASK(7, 1)
> +
>  /* bits 0..5 enable force when cleared */
>  #define RTL8366RB_MAC_FORCE_CTRL_REG	0x0F11
>  
> @@ -835,6 +841,15 @@ static int rtl8366rb_setup(struct dsa_switch *ds)
>  	if (ret)
>  		return ret;
>  
> +	/* Isolate user ports */
> +	for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) {
> +		ret = regmap_write(smi->map, RTL8366RB_PORT_ISO(i),
> +				   RTL8366RB_PORT_ISO_EN |
> +				   BIT(RTL8366RB_PORT_NUM_CPU + 1));

You have a RTL8366RB_PORT_ISO_PORTS_MASK that you don't use, and you
open-code a +1 here and everywhere below. Wouldn't it be more useful to
have a macro for RTL8366RB_PORT_ISO_PORTS(mask)?

> +		if (ret)
> +			return ret;
> +	}
> +
>  	/* Set up the "green ethernet" feature */
>  	ret = rtl8366rb_jam_table(rtl8366rb_green_jam,
>  				  ARRAY_SIZE(rtl8366rb_green_jam), smi, false);
> @@ -963,10 +978,6 @@ static int rtl8366rb_setup(struct dsa_switch *ds)
>  			return ret;
>  	}
>  
> -	ret = rtl8366_init_vlan(smi);
> -	if (ret)
> -		return ret;
> -

You can actually delete rtl8366_init_vlan now, it is unused.

>  	ret = rtl8366rb_setup_cascaded_irq(smi);
>  	if (ret)
>  		dev_info(smi->dev, "no interrupt support\n");
> @@ -977,8 +988,6 @@ static int rtl8366rb_setup(struct dsa_switch *ds)
>  		return -ENODEV;
>  	}
>  
> -	ds->configure_vlan_while_not_filtering = false;
> -
>  	return 0;
>  }
>  
> @@ -1127,6 +1136,54 @@ rtl8366rb_port_disable(struct dsa_switch *ds, int port)
>  	rb8366rb_set_port_led(smi, port, false);
>  }
>  
> +static int
> +rtl8366rb_port_bridge_join(struct dsa_switch *ds, int port,
> +			   struct net_device *bridge)
> +{
> +	struct realtek_smi *smi = ds->priv;
> +	unsigned int port_bitmap = 0;
> +	int ret, i;
> +
> +	for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) {

Could you use ds->num_ports please?

> +		if (i == port)
> +			continue;
> +		if (dsa_to_port(ds, i)->bridge_dev != bridge)
> +			continue;
> +		ret = regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(i),
> +					 0, BIT(port + 1));

You call regmap_update_bits with a mask of 0? What does it mean?
This is tested, right?

> +		if (ret)
> +			return ret;
> +
> +		port_bitmap |= BIT(i);
> +	}
> +
> +	return regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(port),
> +				  0, port_bitmap << 1);
> +}
> +
> +static void
> +rtl8366rb_port_bridge_leave(struct dsa_switch *ds, int port,
> +			    struct net_device *bridge)
> +{
> +	struct realtek_smi *smi = ds->priv;
> +	unsigned int port_bitmap = 0;
> +	int i;
> +
> +	for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) {
> +		if (i == port)
> +			continue;
> +		if (dsa_to_port(ds, i)->bridge_dev != bridge)
> +			continue;
> +		regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(i),
> +				   BIT(port + 1), 0);
> +
> +		port_bitmap |= BIT(i);
> +	}
> +
> +	regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(port),
> +			   port_bitmap << 1, 0);
> +}
> +