"Supports VLAN insertion and removal for up to 512 VLAN tags located anywhere in the 4K VLAN space"
I think you were saying about this introduction, right?
In my understanding this is related with HW tagging, an offload functionality. Does it also limit the VLAN_MAC filter number?
Can you help confirm the meaning of the 2 return errors (-53/16)?
I tried with 82599 NIC in the same box and 4094 VLAN can be configured successfully.