[Bug 195978] New: Add vlan support to xen netback

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

            Bug ID: 195978
           Summary: Add vlan support to xen netback
           Product: Base System
           Version: 10.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bugs.freebsd.org at zengel.info

My pfsense is running on XEN with Debian Wheezy and now Jessie.
I'm using vlans in my pfsense because I have more than 8 networks on xen host.

After upgrading from pfsense 2.1.5 to 2.2 beta (FreeBSD 10.1) I can use PV
drivers and interface changed from em0 to xn0 (netfront).

But Pfsense didn't let me use VLANs on xn0 because this interface is not
VLANMTU capable.
All my arguments that tagging is always posible won't be heared.
https://redmine.pfsense.org/issues/4103

Chris Buechler means that there are problems with vlans in the netfront driver.

So I can't use the improvements of PV enabled systems.

Please make the netfront driver VLAN cappable.

Here I found a patch:
https://forum.pfsense.org/index.php/topic,37693.0.html

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