netdev - [PATCH 2/2] ether: Add ETH_P

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Date:   Wed, 18 Dec 2019 14:44:48 -0800
From:   Andre Guedes <andre.guedes@...el.com>
To:     netdev@...r.kernel.org
Cc:     Andre Guedes <andre.guedes@...el.com>
Subject: [PATCH 2/2] ether: Add ETH_P_AVTP macro

This patch adds the ETH_P_AVTP macro which defines the Audio/Video
Transport Protocol (AVTP) ethertype assigned to 0x22F0, according to:

http://standards-oui.ieee.org/ethertype/eth.txt

AVTP is the transport protocol utilized in Audio/Video Bridging (AVB),
and it is defined by IEEE 1722 standard.

Note that we have ETH_P_TSN macro defined with the number assigned to
AVTP. However, there is no "TSN" ethertype. TSN is not a protocol, but a
set of features to deliver networking determinism, so ETH_P_TSN can be a
bit misleading. For compatibility reasons we should keep it around.
This patch re-defines it using the ETH_P_AVTP macro to make it explicit.

Signed-off-by: Andre Guedes <andre.guedes@...el.com>
---
 include/uapi/linux/if_ether.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h
index 0752281ee05a..c75cb646ba08 100644
--- a/include/uapi/linux/if_ether.h
+++ b/include/uapi/linux/if_ether.h
@@ -47,7 +47,8 @@
 #define ETH_P_LOOP	0x0060		/* Ethernet Loopback packet	*/
 #define ETH_P_PUP	0x0200		/* Xerox PUP packet		*/
 #define ETH_P_PUPAT	0x0201		/* Xerox PUP Addr Trans packet	*/
-#define ETH_P_TSN	0x22F0		/* TSN (IEEE 1722) packet	*/
+#define ETH_P_AVTP	0x22F0		/* AVTP (IEEE 1722)		*/
+#define ETH_P_TSN	ETH_P_AVTP	/* There is no TSN ethertype, we define it for compatibility reasons */
 #define ETH_P_ERSPAN2	0x22EB		/* ERSPAN version 2 (type III)	*/
 #define ETH_P_IP	0x0800		/* Internet Protocol packet	*/
 #define ETH_P_X25	0x0805		/* CCITT X.25			*/
-- 
2.24.1