[PATCH] 802.1p priority (fixed)

[Jeremie Le Hen]

> > Having the possibility to test and set the 802.1p or TOS values
> > separately would avoid making a "trust"/"override" subtlety and will
> > obviously make it more flexible.
> 
> I agree on this point.  The one thing to be careful of is that 802.1p
> priorities and TOS values work rather differently in that TOS values fit
> in to an existing field of the packet and 802.1p values require
> modifications to the header and adding data between the header and the
> real body, possiably with a resuling reduction in MTU (though what
> you're doing trying to use 802.1p priority with crappy nic I don't know
> :-).

I do not understand your point here.  TOS is indeed an existing field
of the IPv4 header but AFAIK, this is the same for the 802.1p header [1].
There are already 3 bits reserved for priority (802.1p) near the 802.1q
field which are both inside what they call "Tag Control Information".

Regards,

[1] http://www.networkdictionnary.com/protocols/8021p.php
-- 
Jeremie Le Hen
jeremie at le-hen.org