ebtables, pppoe and traffic control

I have a requirement which I don't think it's too fancy but there is
probably no off-hand ready solution to it. I would need some
advise on the subject matter.

I have made myself a Linux-based bridge, eth0 bridged with
eth1 to form br0.

In this bridge, I run 'tc' script to handle QoS.

So far nothing unusual.

However, what's different is that this bridge is sitted in between a pppoe
client
and pppoe server, ie pppoe frames are bridge between the Linux bridge, and
I am interested to perform QoS on the pppoe frames, based on the ip tos
setting of the ppp packets ( I presume the ip is encapsulated inside the
pppoe frames ?).

For example, normal tc script :-

tc filter add dev ppp0 parent 1:0 prio 10 u32 \
     match ip tos 0x10 0xff \
     flowid 1:4

This will work on a ppp0 device because the ppp0 has ip packets flowing
through it. Now in my bridge, there is no such device, I only have access to
eth0
or eth1, how could I perform the same thing on devices such as eth0 or eth1,
but
matching the ip TOS setting inside the pppoe frame ?

It seems somebody is already asking for ebtables to deal extra things for
pppoe.
But I wonder if my objective can be met with the help of ebtables ?

Best regards.




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