netdev - Re: [PATCH net-next 4/5 v2] net: dsa: rtl8366rb: Support flood control

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Date:   Mon, 30 Aug 2021 23:35:31 +0000
From:   Alvin Šipraga <ALSI@...g-olufsen.dk>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Mauri Sandberg <sandberg@...lfence.com>,
        DENG Qingfang <dqfext@...il.com>
Subject: Re: [PATCH net-next 4/5 v2] net: dsa: rtl8366rb: Support flood
 control

On 8/30/21 11:48 PM, Linus Walleij wrote:
> Now that we have implemented bridge flag handling we can easily
> support flood (storm) control as well so let's do it.
> 
> Cc: Vladimir Oltean <olteanv@...il.com>
> Cc: Alvin Šipraga <alsi@...g-olufsen.dk>
> Cc: Mauri Sandberg <sandberg@...lfence.com>
> Cc: DENG Qingfang <dqfext@...il.com>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---

Reviewed-by: Alvin Šipraga <alsi@...g-olufsen.dk>

> ChangeLog v1->v2:
> - New patch
> ---
>   drivers/net/dsa/rtl8366rb.c | 38 ++++++++++++++++++++++++++++++++++++-
>   1 file changed, 37 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/rtl8366rb.c b/drivers/net/dsa/rtl8366rb.c
> index 2cadd3e57e8b..4cb0e336ce6b 100644
> --- a/drivers/net/dsa/rtl8366rb.c
> +++ b/drivers/net/dsa/rtl8366rb.c
> @@ -149,6 +149,11 @@
>   
>   #define RTL8366RB_VLAN_INGRESS_CTRL2_REG	0x037f
>   
> +#define RTL8366RB_STORM_BC_CTRL			0x03e0
> +#define RTL8366RB_STORM_MC_CTRL			0x03e1
> +#define RTL8366RB_STORM_UNDA_CTRL		0x03e2
> +#define RTL8366RB_STORM_UNMC_CTRL		0x03e3
> +
>   /* LED control registers */
>   #define RTL8366RB_LED_BLINKRATE_REG		0x0430
>   #define RTL8366RB_LED_BLINKRATE_MASK		0x0007
> @@ -1158,7 +1163,8 @@ rtl8366rb_port_pre_bridge_flags(struct dsa_switch *ds, int port,
>   				struct netlink_ext_ack *extack)
>   {
>   	/* We support enabling/disabling learning */

Perhaps you can remove this comment altogether, since we support more 
things now, and it is self evident anyway.

> -	if (flags.mask & ~(BR_LEARNING))
> +	if (flags.mask & ~(BR_LEARNING | BR_BCAST_FLOOD |
> +                           BR_MCAST_FLOOD | BR_FLOOD))
>   		return -EINVAL;
>   
>   	return 0;
> @@ -1180,6 +1186,36 @@ rtl8366rb_port_bridge_flags(struct dsa_switch *ds, int port,
>   			return ret;
>   	}
>   
> +	if (flags.mask & BR_BCAST_FLOOD) {
> +		ret = regmap_update_bits(smi->map, RTL8366RB_STORM_BC_CTRL,
> +					 BIT(port),
> +					 (flags.val & BR_BCAST_FLOOD) ? BIT(port) : 0);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	if (flags.mask & BR_MCAST_FLOOD) {
> +		ret = regmap_update_bits(smi->map, RTL8366RB_STORM_MC_CTRL,
> +					 BIT(port),
> +					 (flags.val & BR_MCAST_FLOOD) ? BIT(port) : 0);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	/* Enable/disable both types of unicast floods */
> +	if (flags.mask & BR_FLOOD) {
> +		ret = regmap_update_bits(smi->map, RTL8366RB_STORM_UNDA_CTRL,
> +					 BIT(port),
> +					 (flags.val & BR_FLOOD) ? BIT(port) : 0);
> +		if (ret)
> +			return ret;
> +		ret = regmap_update_bits(smi->map, RTL8366RB_STORM_UNMC_CTRL,
> +					 BIT(port),
> +					 (flags.val & BR_FLOOD) ? BIT(port) : 0);
> +		if (ret)
> +			return ret;
> +	}
> +
>   	return 0;
>   }
>   
>