RE: [Xen-devel] Problem with VLANs on tg3 NICs

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I have 3 machines,
>     T60 thinkpad with e1000 NIC
>     Dell PowerEdge 2950 with bnx2 NIC
>     HP DL360 G4P with tg3 NIC
> All running xen 3.03 / 2.6.16.29-xen
> 
> I have a netbootable image with 2.6.16.29-xenU.  This image when it
> boots creates a vlan eth0.4002, and then tries to communicate on that
> interface to a central server.

Please can you describe the setup in more detail, including the bridge
and NIC setup in dom0. It sounds like you're trying to pass a VLAN trunk
into a guest and then use vconfig inside the guest, but I didn't think
you could do this with the standard linux bridge as it didn't support
VLAN trunking. 

Ian

 
> On the machines with e1000 an bnx2 NICs, this works fine.  On the
> machine with tg3 NICs, this does not work.
> 
> It's a little bit hard to tell, but I think whats happening is that
the
> packets are going out tagged ok.  But, on ingress in dom0, the tg3
> driver is stripping the vlan tag:
> 
> I'm not sure I trust tcpdump 100% but it seems to support that the arp
> request is going out tagged, but the response is coming back untagged:
> 
> 09:41:43.126497 00:16:3e:5a:4e:d8 > Broadcast, ethertype 802.1Q
> (0x8100), length 46: vlan 4002, p 0, ethertype ARP, arp who-has
> 10.21.1.1 tell 10.21.1.99
>         0x0000:  0fa2 0806 0001 0800 0604 0001 0016 3e5a
..............>Z
>         0x0010:  4ed8 0a15 0163 0000 0000 0000 0a15 0101
N....c..........
> 09:41:43.126591 00:0e:aa:04:00:01 > 00:16:3e:5a:4e:d8, ethertype ARP
> (0x0806), length 60: arp reply 10.21.1.1 is-at 00:0e:aa:04:00:01
>         0x0000:  0001 0800 0604 0002 000e aa04 0001 0a15
................
>         0x0010:  0101 0016 3e5a 4ed8 0a15 0163 0000 0000
....>ZN....c....
>         0x0020:  0000 0000 0000 0000 0000 0000 0000
..............
> 
> I did a quick experiment using xen 3.0.4_1 and got the same results.
> 
> Any ideas?
> 
> Evan
> 
> 
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