netdev - Re: [RFC PATCH net-next 10/11] net: dsa: microchip: lan937x: update vlan untag membership

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Date:   Sat, 4 Feb 2023 01:48:57 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Rakesh Sankaranarayanan <rakesh.sankaranarayanan@...rochip.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        andrew@...n.ch, f.fainelli@...il.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        woojung.huh@...rochip.com, UNGLinuxDriver@...rochip.com,
        linux@...linux.org.uk
Subject: Re: [RFC PATCH net-next 10/11] net: dsa: microchip: lan937x: update
 vlan untag membership

On Thu, Feb 02, 2023 at 06:29:29PM +0530, Rakesh Sankaranarayanan wrote:
> Exclude cascaded port from vlan untag membership table since it will be
> the host port for second switch. Here setting 1 means, port will be
> capable of receiving tagged frames and 0 means, port can not receive
> tagged frames.
> 
> Signed-off-by: Rakesh Sankaranarayanan <rakesh.sankaranarayanan@...rochip.com>
> ---
>  drivers/net/dsa/microchip/ksz9477.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
> index bf13d47c26cf..4c12131098b1 100644
> --- a/drivers/net/dsa/microchip/ksz9477.c
> +++ b/drivers/net/dsa/microchip/ksz9477.c
> @@ -399,7 +399,7 @@ int ksz9477_port_vlan_add(struct ksz_device *dev, int port,
>  		vlan_table[1] |= BIT(port);
>  	else
>  		vlan_table[1] &= ~BIT(port);
> -	vlan_table[1] &= ~(BIT(dev->cpu_port));
> +	vlan_table[1] &= ~(BIT(dev->cpu_port) | BIT(dev->dsa_port));

same comment, what if dev->dsa_port is 0xff?

>  
>  	vlan_table[2] |= BIT(port) | BIT(dev->cpu_port);
>  
> -- 
> 2.34.1
>