linux-kernel - Re: [PATCH net-next v3 2/6] net: dsa: qca: ar9331: make proper initial port defaults

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Message-ID: <20210802140345.zreovwix6nuyjwjy@skbuf>
Date:   Mon, 2 Aug 2021 17:03:45 +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 2/6] net: dsa: qca: ar9331: make proper
 initial port defaults

On Mon, Aug 02, 2021 at 03:10:33PM +0200, Oleksij Rempel wrote:
> Make sure that all external port are actually isolated from each other,
> so no packets are leaked.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/dsa/qca/ar9331.c | 109 ++++++++++++++++++++++++++++++++++-
>  1 file changed, 108 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/qca/ar9331.c b/drivers/net/dsa/qca/ar9331.c
> index 6686192e1883..2f5673ea3140 100644
> --- a/drivers/net/dsa/qca/ar9331.c
> +++ b/drivers/net/dsa/qca/ar9331.c
> @@ -60,10 +60,20 @@
>  
>  #define AR9331_SW_REG_FLOOD_MASK		0x2c
>  #define AR9331_SW_FLOOD_MASK_BROAD_TO_CPU	BIT(26)
> +#define AR9331_SW_FLOOD_MASK_MULTI_FLOOD_DP	GENMASK(20, 16)
> +#define AR9331_SW_FLOOD_MASK_UNI_FLOOD_DP	GENMASK(4, 0)
>  
>  #define AR9331_SW_REG_GLOBAL_CTRL		0x30
>  #define AR9331_SW_GLOBAL_CTRL_MFS_M		GENMASK(13, 0)
>  
> +#define AR9331_SW_REG_ADDR_TABLE_CTRL		0x5c
> +#define AR9331_SW_AT_ARP_EN			BIT(20)
> +#define AR9331_SW_AT_LEARN_CHANGE_EN		BIT(18)
> +#define AR9331_SW_AT_AGE_EN			BIT(17)
> +#define AR9331_SW_AT_AGE_TIME			GENMASK(15, 0)
> +/* AGE_TIME_COEF is not documented. This is "works for me" value */
> +#define AR9331_SW_AT_AGE_TIME_COEF		6900

Not documented, not used either, it seems.
"Works for you" based on what?

> +
>  #define AR9331_SW_REG_MDIO_CTRL			0x98
>  #define AR9331_SW_MDIO_CTRL_BUSY		BIT(31)
>  #define AR9331_SW_MDIO_CTRL_MASTER_EN		BIT(30)
> @@ -101,6 +111,46 @@
>  	 AR9331_SW_PORT_STATUS_RX_FLOW_EN | AR9331_SW_PORT_STATUS_TX_FLOW_EN | \
>  	 AR9331_SW_PORT_STATUS_SPEED_M)

Is this patch material for "net"? If standalone ports is all that ar9331
supports, then it would better not do packet forwarding in lack of a
bridge device.