linux-kernel - Re: [RFC 8/9] net: dsa: mv88e6352: set port 802.1Q mode to Secure

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Date:	Tue, 02 Jun 2015 07:31:57 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
	netdev@...r.kernel.org
CC:	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Andrew Lunn <andrew@...n.ch>,
	Scott Feldman <sfeldma@...il.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Jerome Oufella <jerome.oufella@...oirfairelinux.com>,
	linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com,
	Chris Healy <cphealy@...il.com>
Subject: Re: [RFC 8/9] net: dsa: mv88e6352: set port 802.1Q mode to Secure

On 06/01/2015 06:27 PM, Vivien Didelot wrote:
> This commit changes the 802.1Q mode of each port from Disabled to
> Secure. This enables the VLAN support, by checking the VTU entries on
> ingress.
>
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> ---
>   drivers/net/dsa/mv88e6xxx.c | 14 +++++++-------
>   drivers/net/dsa/mv88e6xxx.h |  5 +++++
>   2 files changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
> index ed49bd8..35243d8 100644
> --- a/drivers/net/dsa/mv88e6xxx.c
> +++ b/drivers/net/dsa/mv88e6xxx.c
> @@ -1723,13 +1723,11 @@ static int mv88e6xxx_setup_port(struct dsa_switch *ds, int port)
>   			goto abort;
>   	}
>
> -	/* Port Control 2: don't force a good FCS, set the maximum
> -	 * frame size to 10240 bytes, don't let the switch add or
> -	 * strip 802.1q tags, don't discard tagged or untagged frames
> -	 * on this port, do a destination address lookup on all
> -	 * received packets as usual, disable ARP mirroring and don't
> -	 * send a copy of all transmitted/received frames on this port
> -	 * to the CPU.
> +	/* Port Control 2: don't force a good FCS, set the maximum frame size to
> +	 * 10240 bytes, enable secure 802.1q tags, don't discard tagged or
> +	 * untagged frames on this port, do a destination address lookup on all
> +	 * received packets as usual, disable ARP mirroring and don't send a
> +	 * copy of all transmitted/received frames on this port to the CPU.
>   	 */
>   	reg = 0;
>   	if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
> @@ -1751,6 +1749,8 @@ static int mv88e6xxx_setup_port(struct dsa_switch *ds, int port)
>   			reg |= PORT_CONTROL_2_FORWARD_UNKNOWN;
>   	}
>
> +	reg |= PORT_CONTROL_2_8021Q_SECURE;
> +

Hi Vivien,

Unless I misunderstand the documentation, this effectively disables VLAN
support on non-bridge ports, especially since the ndo_ functions to add VLAN
entries to such ports are not implemented. Is that intentional, or am I
missing something ?

Thanks,
Guenter

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