[PATCH v4 net-next 1/7] ether: add EtherType for proprietary Realtek protocols

From: Alvin Šipraga
Date: Mon Oct 18 2021 - 05:40:40 EST


From: Alvin Šipraga <alsi@xxxxxxxxxxxxxxx>

Add a new EtherType ETH_P_REALTEK to the if_ether.h uapi header. The
EtherType 0x8899 is used in a number of different protocols from Realtek
Semiconductor Corp [1], so no general assumptions should be made when
trying to decode such packets. Observed protocols include:

0x1 - Realtek Remote Control protocol [2]
0x2 - Echo protocol [2]
0x3 - Loop detection protocol [2]
0x4 - RTL8365MB 4- and 8-byte switch CPU tag protocols [3]
0x9 - RTL8306 switch CPU tag protocol [4]
0xA - RTL8366RB switch CPU tag protocol [4]

[1] https://lore.kernel.org/netdev/CACRpkdYQthFgjwVzHyK3DeYUOdcYyWmdjDPG=Rf9B3VrJ12Rzg@xxxxxxxxxxxxxx/
[2] https://www.wireshark.org/lists/ethereal-dev/200409/msg00090.html
[3] https://lore.kernel.org/netdev/20210822193145.1312668-4-alvin@xxxxxxx/
[4] https://lore.kernel.org/netdev/20200708122537.1341307-2-linus.walleij@xxxxxxxxxx/

Suggested-by: Andrew Lunn <andrew@xxxxxxx>
Signed-off-by: Alvin Šipraga <alsi@xxxxxxxxxxxxxxx>
Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>
Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
---

v3 -> v4: no change

v2 -> v3: no change; collect Reviewed-by from Florian

v1 -> v2: no change; collect Reviewed-by from Vladimir

RFC -> v1: this patch is new


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 5f589c7a8382..5da4ee234e0b 100644
--- a/include/uapi/linux/if_ether.h
+++ b/include/uapi/linux/if_ether.h
@@ -86,6 +86,7 @@
* over Ethernet
*/
#define ETH_P_PAE 0x888E /* Port Access Entity (IEEE 802.1X) */
+#define ETH_P_REALTEK 0x8899 /* Multiple proprietary protocols */
#define ETH_P_AOE 0x88A2 /* ATA over Ethernet */
#define ETH_P_8021AD 0x88A8 /* 802.1ad Service VLAN */
#define ETH_P_802_EX1 0x88B5 /* 802.1 Local Experimental 1. */
--
2.32.0