netdev - Re: [PATCH net-next v2 2/2] net: dsa: mv88e6xxx: fix duplicate vlan warning

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Message-ID: <20200226171129.GC25745@shell.armlinux.org.uk>
Date:   Wed, 26 Feb 2020 17:11:29 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: Re: [PATCH net-next v2 2/2] net: dsa: mv88e6xxx: fix duplicate vlan
 warning

Please ignore this patch - I'll send v3 with an updated version, as
I've found the same workaround is needed for DSA ports as well.

On Wed, Feb 26, 2020 at 05:10:15PM +0000, Russell King wrote:
> When setting VLANs on DSA switches, the VLAN is added to both the port
> concerned as well as the CPU port by dsa_slave_vlan_add().  If multiple
> ports are configured with the same VLAN ID, this triggers a warning on
> the CPU port.
> 
> Avoid this warning for CPU ports.
> 
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
> ---
>  drivers/net/dsa/mv88e6xxx/chip.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
> index 4ec09cc8dcdc..629eb7bbbb23 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.c
> +++ b/drivers/net/dsa/mv88e6xxx/chip.c
> @@ -1795,7 +1795,7 @@ static int mv88e6xxx_broadcast_setup(struct mv88e6xxx_chip *chip, u16 vid)
>  }
>  
>  static int mv88e6xxx_port_vlan_join(struct mv88e6xxx_chip *chip, int port,
> -				    u16 vid, u8 member)
> +				    u16 vid, u8 member, bool warn)
>  {
>  	const u8 non_member = MV88E6XXX_G1_VTU_DATA_MEMBER_TAG_NON_MEMBER;
>  	struct mv88e6xxx_vtu_entry vlan;
> @@ -1840,7 +1840,7 @@ static int mv88e6xxx_port_vlan_join(struct mv88e6xxx_chip *chip, int port,
>  		err = mv88e6xxx_vtu_loadpurge(chip, &vlan);
>  		if (err)
>  			return err;
> -	} else {
> +	} else if (warn) {
>  		dev_info(chip->dev, "p%d: already a member of VLAN %d\n",
>  			 port, vid);
>  	}
> @@ -1854,6 +1854,7 @@ static void mv88e6xxx_port_vlan_add(struct dsa_switch *ds, int port,
>  	struct mv88e6xxx_chip *chip = ds->priv;
>  	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
>  	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
> +	bool warn;
>  	u8 member;
>  	u16 vid;
>  
> @@ -1867,10 +1868,15 @@ static void mv88e6xxx_port_vlan_add(struct dsa_switch *ds, int port,
>  	else
>  		member = MV88E6XXX_G1_VTU_DATA_MEMBER_TAG_TAGGED;
>  
> +	/* net/dsa/slave.c will call dsa_port_vlan_add() for the affected port
> +	 * and then the CPU port. Do not warn for duplicates for the CPU port.
> +	 */
> +	warn = !dsa_is_cpu_port(ds, port);
> +
>  	mv88e6xxx_reg_lock(chip);
>  
>  	for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid)
> -		if (mv88e6xxx_port_vlan_join(chip, port, vid, member))
> +		if (mv88e6xxx_port_vlan_join(chip, port, vid, member, warn))
>  			dev_err(ds->dev, "p%d: failed to add VLAN %d%c\n", port,
>  				vid, untagged ? 'u' : 't');
>  
> -- 
> 2.20.1
> 
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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