cvs commit: src/sys/dev/bge if_bge.c

Peter Jeremy peterjeremy at
Tue Sep 19 12:04:54 PDT 2006

On Tue, 2006-Sep-19 14:30:59 -0400, Jung-uk Kim wrote:
>On Tuesday 19 September 2006 01:52 pm, John Baldwin wrote:
>> Which I'm about to kill hopefully.  Please let's fix this the right
>> way and not hack it any further.
>Sure, no problem.  But I don't think we can DTRT on -STABLE without 
>breaking API.  Can we?

I've had a quick look into this problem because I extensively use
VLANs on a bge and discovered that I no longer have VLAN tag details
(which makes packet tracing a nuisance).

As far as I can see, there is nothing preventing bpf_tap() and
bpf_mtap2() being doctored to undo the VLAN detagging so that
bpf_filter() is passed a mbuf chain that looks like an 802.1Q
ethernet frame:  Dummy up an mbuf (as bpf_mtap2() does) that
contains the MAC addresses from the incoming data followed by
the 802.1Q packet type and tag information, with m_next pointing
to the byte after the MAC addresses in the original data.

Peter Jeremy
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