[Bug 207633] bce0: Discard frame w/o leading ethernet header (len 0 pkt len 0) - pfSense 2.2.6 and 2.3 Beta

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207633

            Bug ID: 207633
           Summary: bce0: Discard frame w/o leading ethernet header (len 0
                    pkt len 0) - pfSense 2.2.6 and 2.3 Beta
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: parwok at gmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

I recently my physical pfSesne install to a virtual machine. I have tried both
pfSense 2.5.6 and 2.6 in kvm and am passing two physical interfaces through,
using a Proxmox (debian) host. Each interface is a BCM5709, in a Dell PowerEdge
R710.

I have found that in order to work around the issue, I have to disconnect the
ethernet cables and allow pfSense to fully boot to the login prompt before
reconnecting them, or else all interfaces spam discard frame errors with len 0
and pkt klen 0. Occasionally, even this workaround fails.

This is problematic in the case of a power event, as it means I will need to be
physically present for the network to come back up. While I realize I'm
thankfully not using this in an enterprise environment, it would be nice to fix
this issue if possible.

Original bug on pfSense tracker: https://redmine.pfsense.org/issues/5649

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