Bond case:
ethX/Y --> BondX --> Bridge  ---> TAP
             |
              -----> Bridge2 ---> VLAN => TAP

no bond:
ethX/Y -> Bridge ----> TAP
  |
  ------> Bridge2 ---> VLAN => TAP


Patched one / my idea / working gvrp:
BondX/EthX --> Bridge ---> TAP
                  |
                   -> VLAN ---> Bridge ---> TAP