cvs commit: src/sys/dev/bge if_bge.c
jkim at FreeBSD.org
Tue Sep 19 12:35:27 PDT 2006
On Tuesday 19 September 2006 03:04 pm, Peter Jeremy wrote:
> 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.
Why don't we just fake it up from ether_input() and pass it to
BPF_MTAP() instead of 'teaching' bpf? I think it is more logical
thing to do.
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