netdev - VLAN ID 0 with priority tagging

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Date:	Wed, 22 Jan 2014 15:49:21 -0800
From:	Sridhar Samudrala <sri@...ibm.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: VLAN ID 0 with priority tagging

I am trying to send a packet with VLAN ID 0 and non-zero priority.

The VLAN interfaces are created on 2 hosts using
     ip link add link eth1 eth1.0 type vlan id 0 egress-qos-map 0:2

When i try to send a packet using ping/arping, on the sender side tcpdump
shows that the VLAN tag is added with ID 0 and priority 2.

However, the receiver is receiving the packet with vlan tag stripped.

I am seeing the same behavior with multiple NICs and also with a switch in
between the 2 hosts or with the 2 hosts connected over loopback cable.

It looks as if the driver on the send side is stripping the tag if vlan 
id is 0.
Is this correct behavior or a bug?
Any clues on how to  get priority tagging to work with vlan id 0?

Thanks
Sridhar

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