[PATCH] Part 1 of low level 802.1p priority support

[Bruce M Simpson]

Hi,

Here is the first patch to bring in 802.1p Packet Priority to FreeBSD; 
this is to support Differentiated Services and Quality-of-Service. This 
builds on the M_VLANTAG support introduced by Andre last September.

This first stage enables FreeBSD to pass packets for 802.1q with VLAN 0 
to the main input path in the stack, which is the IEEE 
standards-compliant behaviour. With the attached patch and test packet, 
you can test this for yourself.

Currently this is limited to interfaces which support VLAN_HWTAGGING. To 
make the change universal, an architectural change is needed; some of 
the inline 802.1q processing needs to be moved from if_vlan.c to 
if_ethersubr.c.

To use this:
 1. Apply attached patch on a separate machine to be used as a test peer.
 2. Process attached hex dump with xxd from Vim distribution 
(editors/vim) to convert back to a binary pcap file.
 3. Configure test address on test peer, preferably using a separate 
physical LAN.
 4. Use ports/net-mgmt/tcpreplay to inject the traffic, with the 
appropriate IP and MAC addresses.
 5. Observe that you get an ICMP echo reply back WITHOUT 802.1q 
encapsulation.

Currently, the code deals only with receiving VLAN tags at a low level 
and does nothing about sending them.
This is just the low level stuff -- QoS is not magically happening right 
now.

Comments... testing... suggestions...

Regards,
BMS

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