[Bug 195978] Add vlan support to xen netfront

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195978

--- Comment #7 from Grischa Zengel <bugs.freebsd.org at zengel.info> ---
1. You have to look if netback can have frames with >= 1522 Bytes.
See 802.1q at
http://www.firewall.cx/networking-topics/vlan-networks/219-vlan-tagging.html
Here is some code from Linux:
netfront (DomU):
http://lxr.free-electrons.com/source/drivers/net/xen-netfront.c
netback (Dom0):
http://lxr.free-electrons.com/source/drivers/net/xen-netback/xenbus.c

2a. https://www.freebsd.org/cgi/man.cgi?query=altq&sektion=4
2b.
https://www.freebsd.org/cgi/man.cgi?query=altq&sektion=9&apropos=0&manpath=FreeBSD+10.1-RELEASE#HOW_TO_CONVERT_THE_EXISTING_DRIVERS

I can't help much more.

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