linux-kernel - [PATCH v2 net-next 07/22] ether: Add dedicated Ethertype for pseudo-802.1Q DSA tagging

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Date:   Wed, 10 Apr 2019 03:56:45 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     f.fainelli@...il.com, vivien.didelot@...il.com, andrew@...n.ch,
        davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        georg.waibel@...sor-technik.de, Vladimir Oltean <olteanv@...il.com>
Subject: [PATCH v2 net-next 07/22] ether: Add dedicated Ethertype for pseudo-802.1Q DSA tagging

With the newly added DSA_TAG_PROTO_8021Q, 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.

Signed-off-by: Vladimir Oltean <olteanv@...il.com>
---
Changes in v2:
New patch.

 include/uapi/linux/if_ether.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h
index 3a45b4ad71a3..3158ba672b72 100644
--- a/include/uapi/linux/if_ether.h
+++ b/include/uapi/linux/if_ether.h
@@ -109,6 +109,7 @@
 #define ETH_P_QINQ2	0x9200		/* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */
 #define ETH_P_QINQ3	0x9300		/* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */
 #define ETH_P_EDSA	0xDADA		/* Ethertype DSA [ NOT AN OFFICIALLY REGISTERED ID ] */
+#define ETH_P_DSA_8021Q	0xDADB		/* Fake VLAN Header for DSA [ NOT AN OFFICIALLY REGISTERED ID ] */
 #define ETH_P_IFE	0xED3E		/* ForCES inter-FE LFB type */
 #define ETH_P_AF_IUCV   0xFBFB		/* IBM af_iucv [ NOT AN OFFICIALLY REGISTERED ID ] */
 
-- 
2.17.1