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From: Andrew Lunn <andrew@lunn.ch>
To: Vladimir Oltean <olteanv@gmail.com>
Cc: f.fainelli@gmail.com, vivien.didelot@gmail.com,
	davem@davemloft.net, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 net-next 05/12] ether: Add dedicated Ethertype for pseudo-802.1Q DSA tagging
Date: Tue, 30 Apr 2019 00:18:58 +0200	[thread overview]
Message-ID: <20190429221858.GR12333@lunn.ch> (raw)
In-Reply-To: <20190429001706.7449-6-olteanv@gmail.com>

On Mon, Apr 29, 2019 at 03:16:59AM +0300, Vladimir Oltean wrote:
> There are two possible utilizations so far:
> 
> - Switch devices that don't support a native insertion/extraction header
>   on the CPU port may still enjoy the benefits of port isolation with a
>   custom VLAN tag.
> 
>   For this, they need to have a customizable TPID in hardware and a new
>   Ethertype to distinguish between real 802.1Q traffic and the private
>   tags used for port separation.
> 
> - Switches that don't support the deactivation of VLAN awareness, but
>   still want to have a mode in which they accept all traffic, including
>   frames that are tagged with a VLAN not configured on their ports, may
>   use this as a fake to trick the hardware into thinking that the TPID
>   for VLAN is something other than 0x8100.
> 
> What follows after the ETH_P_DSA_8021Q EtherType is a regular VLAN
> header (TCI), however there is no other EtherType that can be used for
> this purpose and doesn't already have a well-defined meaning.
> ETH_P_8021AD, ETH_P_QINQ1, ETH_P_QINQ2 and ETH_P_QINQ3 expect that
> another follow-up VLAN tag is present, which is not the case here.
> 
> Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
> Suggested-by: Andrew Lunn <andrew@lunn.ch>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

  reply	other threads:[~2019-04-29 22:19 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-29  0:16 [PATCH v4 net-next 00/12] NXP SJA1105 DSA driver Vladimir Oltean
2019-04-29  0:16 ` [PATCH v4 net-next 01/12] lib: Add support for generic packing operations Vladimir Oltean
2019-04-29  0:16 ` [PATCH v4 net-next 02/12] net: dsa: Introduce driver for NXP SJA1105 5-port L2 switch Vladimir Oltean
2019-04-29  0:16 ` [PATCH v4 net-next 03/12] net: dsa: sja1105: Add support for FDB and MDB management Vladimir Oltean
2019-04-29  0:16 ` [PATCH v4 net-next 04/12] net: dsa: sja1105: Error out if RGMII delays are requested in DT Vladimir Oltean
2019-04-29  0:16 ` [PATCH v4 net-next 05/12] ether: Add dedicated Ethertype for pseudo-802.1Q DSA tagging Vladimir Oltean
2019-04-29 22:18   ` Andrew Lunn [this message]
2019-04-29  0:17 ` [PATCH v4 net-next 06/12] net: dsa: sja1105: Add support for VLAN operations Vladimir Oltean
2019-04-29  0:17 ` [PATCH v4 net-next 07/12] net: dsa: sja1105: Add support for ethtool port counters Vladimir Oltean
2019-04-29  0:17 ` [PATCH v4 net-next 08/12] net: dsa: sja1105: Add support for configuring address aging time Vladimir Oltean
2019-04-29 22:21   ` Andrew Lunn
2019-04-29  0:17 ` [PATCH v4 net-next 09/12] net: dsa: sja1105: Prevent PHY jabbering during switch reset Vladimir Oltean
2019-04-29  0:17 ` [PATCH v4 net-next 10/12] net: dsa: sja1105: Reject unsupported link modes for AN Vladimir Oltean
2019-04-29  0:17 ` [PATCH v4 net-next 11/12] Documentation: net: dsa: Add details about NXP SJA1105 driver Vladimir Oltean
2019-04-29  0:17 ` [PATCH v4 net-next 12/12] dt-bindings: net: dsa: Add documentation for " Vladimir Oltean
2019-05-01  3:44 ` [PATCH v4 net-next 00/12] NXP SJA1105 DSA driver David Miller
2019-05-02 16:31   ` Vladimir Oltean
2019-05-02 16:55     ` Andrew Lunn
2019-05-02 17:05       ` Vladimir Oltean
2019-05-02 19:44     ` David Miller
2019-05-02 16:25 ` Vladimir Oltean

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