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

[daniel pecka]

well, i did some more investigations and here come a results ..

this patch http://patchwork.ozlabs.org/patch/65137/raw/ solves problem
partially .. NICs are working with that but after a deeper look,
connection is lost when the netstack is flooded with higher traffic ..

i can connect with ssh|telnet from qemu-kvm host to sunos machines, but
when i type dmesg for example (or anything else which does for a moment
a higher traffic), the connection freezes ..

when i bind both tap ifaces under one bridge, access each machine via
theirs /dev/console, conection to neighboring guest seems like works as
expected, so this issue only affects connection between kvm host and
guests ..

sorry for my very plain description of problem, but it's again easy to
reproduce ..

so once more in short:

two machines with following settings:
-net nic,model=e1000,macaddr="00:50:56:ba:5e:74",vlan=1 \
-net tap,ifname=oi0,script=no,vlan=1 & ## openindiana

-net nic,model=e1000,macaddr="00:50:56:ba:6e:74",vlan=1 \
-net tap,ifname=solaris0,script=no,vlan=1 & ## solaris

1) ping over directly assigned address on oi0|solaris0 works, connection
is lost when invoked higher trafic aka - ssh|telnet in there and then
typed dmesg command or whatever else which floods /dev/stdin and invokes
due to the that higher traffic

2) when created bridge (brctl addbr br0; brctl addif br0 oi0 solaris0)
and assigned address it behaves same way with exception, that when used
/dev/console on each of them for connection to second machine, netstack
seems like working there okay ..

regards, daniel

-- 
emulated netcards don't work with recent sunos kernel
https://bugs.launchpad.net/bugs/638955
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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