[Qemu-devel] Re: [Bug 638955] Re: emulated netcards don't work with recent sunos kernel

[Stefan Hajnoczi]

On Mon, Feb 28, 2011 at 7:06 PM, geppz <address@hidden> wrote:
> Going with tcpdump -e from within the guest, I have identified that the 
> problem is when a big enough packet is outputed.
> I tried a few times with dmesg, and as soon as the tcp packet reaches the 
> following length:
>
> 18:38:28.340097 52:54:69:b5:89:11 (oui Unknown) > 00:19:b9:81:2c:52 (oui
> Unknown), ethertype IPv4 (0x0800), length 1514: 192.168.7.38.ssh >
> 192.168.7.52.59008: Flags [.], ack 2824, win 64436, options [nop,nop,TS
> val 27488132 ecr 6063255], length 1448
>
> it cannot get through. Then the IP stack tries and retries to send the
> same identical packet, but there will never be any reply from the other
> side. Finally the socket is torn down.
>
> I have bridged networking for the VM. My bridge is a normal linux bridge br0 
> with MTU 1500.
> Has MTU anything to do with all this?
> Is it a linux-bridge bug or a qemu-kvm bug?

Excellent, thanks for posting these details.  The bug is probably in
the NIC hardware emulation and I think we can track this one down
fairly easily.

Can you please post your qemu-kvm command-line including the NIC model
that you are using?

Stefan

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https://bugs.launchpad.net/bugs/638955

Title:
  emulated netcards don't work with recent sunos kernel

Status in QEMU:
  New

Bug description:
  hi there,

  i'm using qemu-kvm backend in version: # qemu-kvm -version
  QEMU PC emulator version 0.12.5 (qemu-kvm-0.12.5), Copyright (c) 2003-2008 
Fabrice Bellard

  and there are just *not working any of model=$type with combinations
  of recent sunos (solaris, openindiana, opensolaris, ..) ..

  you can download for testing purposes iso from here: http://dlc-
  origin.openindiana.org/isos/147/ or from here:
  http://genunix.org/distributions/indiana/ << osol and oi are also
  bubuntu-like *live cds, so no need to bother with installing

  behaviour is as follows:
  e1000 - receiving doesn't work, transmitting works .. dladm (tool for handle 
ethers) shows that is all ok, correct mode is loaded up, it just seems like 
this driver works at 100% but ..

  rtl8169|pcnet - works in 10Mbit mode with several other issues like
  high cpu utilization and so .. dladm is unable to recognize options
  for this kind of -nic

  others - just don't work

  .. i experienced this issue several times in past .. woraround was,
  that rtl8169 worked so-so .. with recent sunos kernel it doesn't.

  it's easy to reproduce, this is why i'm not putting here more then
  launching script for my virtual machine:

  # cat openindiana.sh
  qemu-kvm -hda /home/kvm/openindiana/openindiana.img -m 2048 -localtime -cdrom 
/home/kvm/+images/oi-dev-147-x86.iso -boot d \
  -vga std -vnc :9 -k en-us -monitor 
unix:/home/kvm/openindiana/instance,server,nowait \
  -net nic,model=e1000,vlan=1 -net tap,ifname=oi0,script=no,vlan=1 &

  sleep 2;
  ip l set oi0 up;
  ip a a 192.168.99.9/24 dev oi0;

  regards by daniel