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net: dsa: sja1105: Add support for VLAN operations

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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 <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2019-05-02 23:23:34 +03:00 • committed by David S. Miller
parent bf5bc3ce8a
commit 6666cebc5e
4 changed files with 291 additions and 2 deletions
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4
include/linux/dsa/sja1105.h
View file

@ -7,6 +7,10 @@
#ifndef _NET_DSA_SJA1105_H
#define _NET_DSA_SJA1105_H
#include <linux/etherdevice.h>
#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.