]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/commit
net: dsa: sja1105: Add support for VLAN operations
authorVladimir Oltean <olteanv@gmail.com>
Thu, 2 May 2019 20:23:34 +0000 (23:23 +0300)
committerDavid S. Miller <davem@davemloft.net>
Fri, 3 May 2019 14:49:17 +0000 (10:49 -0400)
commit6666cebc5e306f49a25bd20aa8c1cb8ef8950df5
treefeac9879b812fff6394bba7c875007002847a759
parentbf5bc3ce8a8f32a0d45b6820ede8f9fc3e9c23df
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 <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/dsa/sja1105/sja1105_main.c
drivers/net/dsa/sja1105/sja1105_static_config.c
drivers/net/dsa/sja1105/sja1105_static_config.h
include/linux/dsa/sja1105.h