From 6666cebc5e306f49a25bd20aa8c1cb8ef8950df5 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Thu, 2 May 2019 23:23:34 +0300 Subject: net: dsa: sja1105: Add support for VLAN operations VLAN filtering cannot be properly disabled in SJA1105. So in order to emulate the "no VLAN awareness" behavior (not dropping traffic that is tagged with a VID that isn't configured on the port), we need to hack another switch feature: programmable TPID (which is 0x8100 for 802.1Q). We are reprogramming the TPID to a bogus value which leaves the switch thinking that all traffic is untagged, and therefore accepts it. Under a vlan_filtering bridge, the proper TPID of ETH_P_8021Q is installed again, and the switch starts identifying 802.1Q-tagged traffic. Signed-off-by: Vladimir Oltean Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller --- include/linux/dsa/sja1105.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/dsa') diff --git a/include/linux/dsa/sja1105.h b/include/linux/dsa/sja1105.h index 30559d1d0e1b..abf3977e34fd 100644 --- a/include/linux/dsa/sja1105.h +++ b/include/linux/dsa/sja1105.h @@ -7,6 +7,10 @@ #ifndef _NET_DSA_SJA1105_H #define _NET_DSA_SJA1105_H +#include + +#define ETH_P_SJA1105 ETH_P_DSA_8021Q + /* The switch can only be convinced to stay in unmanaged mode and not trap any * link-local traffic by actually telling it to filter frames sent at the * 00:00:00:00:00:00 destination MAC. -- cgit v1.2.3