802.1p on Linux?

A question for Linux VLAN experts.

I tried to use 802.1p priorities without setting up a VLAN ID. It
seems to make it work, the only way is to create a VLAN interface
eth0.0:

vconfig add eth0 0

Then I can send out packets onto eth0.0 with custom priorities. Here
is the problem: when a DHCP request is sent out of eth0.0, the switch
sends back a DHCP offer packet without any VLAN header. Unfortunately,
the packet is dispatched to eth0 interface instead of eth0.0. As the
result, the DHCP client fails!

Is there anyway to make DHCP client work on eth0.0? Or there exists
any other trick to use 802.1p without setting up VLAN?

Thanks in advance.