This patchset addresses a limitation in dsa_8021q where this sequence of
commands was causing the switch to stop forwarding traffic:

  ip link add name br0 type bridge vlan_filtering 0
  ip link set dev swp2 master br0
  echo 1 > /sys/class/net/br0/bridge/vlan_filtering
  echo 0 > /sys/class/net/br0/bridge/vlan_filtering

The issue has to do with the VLAN table manipulations that dsa_8021q
does without notifying the bridge layer. The solution is to always
restore the VLANs that the bridge knows about, when disabling tagging.

Depends on Vivien Didelot's patchset:
https://patchwork.ozlabs.org/project/netdev/list/?series=127197&state=*

Also see this discussion thread:
https://www.spinics.net/lists/netdev/msg581042.html

Vladimir Oltean (2):
  net: bridge: Populate the pvid flag in br_vlan_get_info
  net: dsa: tag_8021q: Restore bridge VLANs when enabling vlan_filtering

 net/bridge/br_vlan.c |  2 +
 net/dsa/tag_8021q.c  | 91 ++++++++++++++++++++++++++++++++++----------
 2 files changed, 73 insertions(+), 20 deletions(-)

-- 
2.17.1