Hi Jac,
BTW,  what do you mean by saying "networking does not work anymore" -- can you
please check if your issue is the same as

Bug 187006 - [hyper-v] dynamic address (dhcp) obtaining doesn't work on HYPER-V 
OS 2012 R2
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187006 ?

Thanks,
-- Dexuan


> -----Original Message-----
> From: Dexuan Cui
> Sent: Tuesday, January 26, 2016 14:49
> To: Kylie Liang <kyl...@microsoft.com>; Jac Backus <j.bac...@bugworks.com>;
> 'freebsd-virtualization@freebsd.org' <freebsd-virtualization@freebsd.org>; BSD
> Integration Components for Hyper-V <bs...@microsoft.com>
> Subject: RE: Hyper-V networking: problem after upgrade to 10.2
> 
> Hi Jac,
> Kylie meant disabling TSO. Please try this ("ifconfig hn0 -tso").
> 
> The message " hn0: unknown status 1073872902 received" should be an
> unnecessary warning only.
> My 10.2 VM can work fine even if I see the message too.
> 
> Can you please install a 10.2 VM from the 10.2 .ISO file directly as I did 
> and see if
> it works for you?
> 
> I guess we never tried upgrading 10.1 from 10.2.
> Can you please list the steps how you did the upgrading? We'll try the same
> steps.
> 
> Thanks,
> -- Dexuan
> 
> > -----Original Message-----
> > From: Kylie Liang
> > Sent: Tuesday, January 26, 2016 8:01
> > To: Jac Backus <j.bac...@bugworks.com>; 'freebsd-
> virtualizat...@freebsd.org'
> > <freebsd-virtualization@freebsd.org>; BSD Integration Components for Hyper-
> V
> > <bs...@microsoft.com>
> > Subject: RE: Hyper-V networking: problem after upgrade to 10.2
> >
> > Hi Jac,
> >
> > Thank you for asking. To isolate your issue, could you please try disabling 
> > SO
> on
> > your 10.2 system first? Thank you.
> >
> > And I would like to confirm with you
> > 1) You met issue for 10.2 kernel + 10.2 system
> > 2) No issue for 10.1 kernel + 10.1 system
> > 3) No issue for 10.1 kernel + 10.2 system
> >
> > Right? And add our engineers in the list.
> >
> > Thanks,
> > Kylie Liang
> >
> > -----Original Message-----
> > From: owner-freebsd-virtualizat...@freebsd.org [mailto:owner-freebsd-
> > virtualizat...@freebsd.org] On Behalf Of Jac Backus
> > Sent: Tuesday, January 26, 2016 5:56 AM
> > To: 'freebsd-virtualization@freebsd.org' 
> > <freebsd-virtualization@freebsd.org>
> > Subject: Hyper-V networking: problem after upgrade to 10.2
> >
> > Dear reader,
> >
> > Today, I did  upgrade  FreeBSD 10.1 to 10.2 running on Hyper-V on a full
> patched
> > Windows Server 2012 R2 x64 version.
> >
> > After the update, networking does not work anymore.
> >
> > In /var/log/messages is this:
> >
> > Jan 25 21:02:01 mercurius kernel: hn0: <Synthetic Network Interface> on
> > vmbus0 Jan 25 21:02:01 mercurius kernel: hn0: unknown status 1073872902
> > received Jan 25 21:02:01 mercurius kernel: hn0: unknown status 1073872902
> > received Jan 25 21:02:01 mercurius kernel: hn0: hv send offload request
> > succeeded Jan 25 21:02:01 mercurius kernel: hn0: Using defaults for TSO:
> > 65518/35/2048 Jan 25 21:02:01 mercurius kernel: hn0: Ethernet address:
> > 00:15:5d:ac:11:08 Jan 25 21:02:01 mercurius kernel: hn1: <Synthetic Network
> > Interface> on vmbus0 Jan 25 21:02:01 mercurius kernel: hn1: unknown status
> > 1073872902 received Jan 25 21:02:01 mercurius kernel: hn1: unknown status
> > 1073872902 received Jan 25 21:02:01 mercurius kernel: hn1: hv send offload
> > request succeeded Jan 25 21:02:01 mercurius kernel: hn1: Using defaults for
> TSO:
> > 65518/35/2048 Jan 25 21:02:01 mercurius kernel: hn1: Ethernet address:
> > 00:15:5d:ac:11:09 Jan 25 21:02:01 mercurius kernel: hn2: <Synthetic Network
> > Interface> on vmbus0 Jan 25 21:02:01 mercurius kernel: hn2: unknown status
> > 1073872902 received Jan 25 21:02:01 mercurius kernel: hn2: unknown status
> > 1073872902 received Jan 25 21:02:01 mercurius kernel: hn2: hv send offload
> > request succeeded Jan 25 21:02:01 mercurius kernel: hn2: Using defaults for
> TSO:
> > 65518/35/2048 Jan 25 21:02:01 mercurius kernel: hn2: Ethernet address:
> > 00:15:5d:ac:11:07
> >
> > It worked fine with the 10.1 kernel, and when I boot this kernel, it works 
> > again:
> >
> > Jan 25 22:20:02 mercurius kernel: hn0: <Synthetic Network Interface> on
> > vmbus0 Jan 25 22:20:02 mercurius kernel: hn0: Ethernet address:
> > 00:15:5d:ac:11:07 Jan 25 22:20:02 mercurius kernel: hn1: <Synthetic Network
> > Interface> on vmbus0 Jan 25 22:20:02 mercurius kernel: hn1: Ethernet 
> > address:
> > 00:15:5d:ac:11:08 Jan 25 22:20:02 mercurius kernel: hn2: <Synthetic Network
> > Interface> on vmbus0 Jan 25 22:20:02 mercurius kernel: hn2: Ethernet 
> > address:
> > 00:15:5d:ac:11:09
> >
> > So I am running  a 10.2 system on a 10.1 kernel at the moment.
> >
> > I found nothing in /usr/src/UPDATING and not really anything on the net.
> >
> > So, could you tell why does this happen, and how can I solve this?
> >
> > Thanks for the help!
> >
> > With kind regards,
> >
> > Jac Backus
> >
> >
> >
> > _______________________________________________
> > freebsd-virtualization@freebsd.org mailing list
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