[ovs-discuss] DPDK OVS with vhostuser problem

Mon Mar 7 15:46:46 UTC 2016


> -----Original Message-----
> From: discuss [mailto:discuss-bounces at openvswitch.org] On Behalf Of Eli
> Britstein
> Sent: Monday, 07 March, 2016 5:24 PM
> To: Loftus, Ciara; discuss at openvswitch.org
> Subject: Re: [ovs-discuss] DPDK OVS with vhostuser problem
>
>
>
> > -----Original Message-----
> > From: Loftus, Ciara [mailto:ciara.loftus at intel.com]
> > Sent: Monday, 07 March, 2016 1:48 PM
> > To: Eli Britstein; discuss at openvswitch.org
> > Subject: RE: DPDK OVS with vhostuser problem
> >
> > > > > Hi
> > > > >
> > > > > I followed the instructions in INSTALL.md and INSTALL.DPDK.md.
> > > > > I have created two ports in a bridge, and set the flows 1<->2.
> > > > > Doing ovs-ofctl dump-flows br0 shows it right.
> > > > > The purpose of this setup is to measure latency of those ports
> > > > > (using a simple ping).
> > > > >
> > > > > I invoke a VM, with those 2 ports. It gives those messages:
> > > > > 2016-03-02T17:08:17.410601Z qemu-system-x86_64: -netdev
> > > > > type=vhost-
> > > > > user,id=mynet1,chardev=char1,vhostforce: chardev "char1" went up
> > > 2016-
> > > > > 03-02T17:08:17.410851Z qemu-system-x86_64: -netdev type=vhost-
> > > > > user,id=mynet2,chardev=char2,vhostforce: chardev "char2" went up
> > > > >
> > > > > From within the VM (qemu), I have eth0 and eth1.
> > > > > I configure them as:
> > > > > ifconfig eth0 1.1.1.1
> > > > > ifconfig eth1 1.1.1.2
> > > > >
> > > > > Ping will fail though:
> > > > > ping 1.1.1.2 -I eth1 obviously works.
> > > > > ping 1.1.1.2 -I eth0 fails.
> > > > >
> > > > > In the host, I wanted to see some statistics, but ovs-ofctl
> > > > > dump-flows
> > > > > br0 fails, with this message:
> > > > >
> > > > > ovs-ofctl: /usr/local/var/run/openvswitch/br0.mgmt: failed to
> > > > > open socket (Connection refused)
> > > > >
> > > > > I see that this issue is right after invoking the VM.
> > > > >
> > > > > 1. What do I do wrong?
> > > > > 2. How can I track the packets to see why they are not forwarded
> > > correctly?
> > > >
> > > > Hi Eli,
> > > >
> > > > Can you give more information about your set up please - OVS /
> > > > QEMU / DPDK tags / commit ids?
> > > [Eli Britstein]
> > > OVS: 2.5.0
> > > QEMU:
> > > qemu-system-x86_64 --version
> > > QEMU emulator version 2.1.3 (qemu-2.1.3-11.fc21), Copyright (c)
> > > 2003-2008 Fabrice Bellard
> > > --> Before that version I had 2.1.2. I did "yum update qemu" and got
> > > --> this. I
> > > have Fedora21, and that's the latest for this dist
> > > (http://rpm.pbone.net/index.php3/stat/3/srodzaj/1/search/qemu-
> kvm).
> > > I see in documentation that need QEMU 2.2, but on the other hand it
> > > was verified with Fedora 18/19/20.
> > Okay, it may be an issue with the QEMU version so.
> > To try another version of QEMU, you could clone the QEMU git repo (git
> > clone git://git.qemu-project.org/qemu.git) and checkout a newer tag eg.
> > 2.5.0 Then configure & make, and use for your vhost-user test.
> [Eli Britstein] Thanks. Indeed, that was the problem. Now (with qemu 2.5.0)
> the process doesn't crash, and I can see the flows:
> NXST_FLOW reply (xid=0x4):
>  cookie=0x0, duration=393.732s, table=0, n_packets=14, n_bytes=588,
> idle_age=376, in_port=1 actions=output:2  cookie=0x0, duration=393.729s,
> table=0, n_packets=3, n_bytes=126, idle_age=352, in_port=2
> actions=output:1
>
> However, it still doesn't quite works.
> As I wrote before, in the VM, I do "ping 1.1.1.2 -I eth0" - then I can see it
> indeed gets packets on port 1 of the ovs (see 14 packets above), but the ping
> is not answered.
> To verify the second port indeed works, I also did "ping 1.1.1.1 -I eth1", and I
> see 3 packets above in port 2 of the ovs.
> Could you please advise why packets are not forwarded 1<->2 as I want so
> ping would work?
[Eli Britstein] Problem solved. The problem was ARP issue in the VM.
I assigned each port to a different VM, and then ping between VMs.
Thanks for your help!

>
> Thanks, Eli.
>
> >
> > Thanks,
> > Ciara
> >
> >
> > > DPDK: 2.2.0
> > >
> > > > When ovs-ofctl dump-flows fails with 'connection refused', are the
> > > > ovs- vswitchd/ovsdb-server processes still running? Or has
> > > > something
> > crashed?
> > > [Eli Britstein] I didn't notice before. I see ovs-vswitchd doesn't exist in
> "ps"
> > > anymore. Probably crached.
> > > I did it again with --log-file and -vconsole:dbg -vsyslog:dbg -vfile:dbg.
> > > I see towards the end of the file "dumped all flows", but that's a
> > > try I did before invoking QEMU.
> > > Attached the log file, though I don't see any errors there...
> > > After invoking QEMU:
> > > [root at localhost openvswitch-2.5.0]# ovs-ofctl dump-flows br0
> > > ovs-ofctl: /usr/local/var/run/openvswitch/br0.mgmt: failed to open
> > > socket (Connection refused)
> > >
> > >
> > > >
> > > > Thanks,
> > > > Ciara
> > > >
> > > > >
> > > > > Thanks,
> > > > > Eli
> > > > >
> > >
> > > --------------------------------------------------------------------
> > > --
> > > ------------------------
> > > ---------------------------------------------------
> > > This email and any files transmitted and/or attachments with it are
> > > confidential and proprietary information of Toga Networks Ltd., and
> > > intended solely for the use of the individual or entity to whom they
> > > are addressed.
> > > If you have received this email in error please notify the system manager.
> > > This message contains confidential
> > > information of Toga Networks Ltd., and is intended only for the
> > > individual named. If you are not the named addressee you should not
> > > disseminate, distribute or copy this e-mail. Please notify the
> > > sender immediately by e-mail if you have received this e-mail by
> > > mistake and delete this e-mail from your system. If you are not the
> > > intended recipient you are notified that disclosing, copying,
> > > distributing or taking any action in reliance on the contents of
> > > this information is strictly prohibited.
> > > --------------------------------------------------------------------
> > > --
> > > ------------------------
> > > --------------------------------------------------
>
> ----------------------------------------------------------------------------------------------
> ---------------------------------------------------
> This email and any files transmitted and/or attachments with it are
> confidential and proprietary information of Toga Networks Ltd., and
> intended solely for the use of the individual or entity to whom they are
> addressed.
> If you have received this email in error please notify the system manager.
> This message contains confidential information of Toga Networks Ltd., and is
> intended only for the individual named. If you are not the named addressee
> you should not disseminate, distribute or copy this e-mail. Please notify the
> sender immediately by e-mail if you have received this e-mail by mistake and
> delete this e-mail from your system. If you are not the intended recipient
> you are notified that disclosing, copying, distributing or taking any action in
> reliance on the contents of this information is strictly prohibited.
> ----------------------------------------------------------------------------------------------
> --------------------------------------------------
>
> _______________________________________________
> discuss mailing list
> discuss at openvswitch.org
> http://openvswitch.org/mailman/listinfo/discuss
> ----------------------------------------------------------------------------------------------
> ---------------------------------------------------
> This email and any files transmitted and/or attachments with it are
> confidential and proprietary information of Toga Networks Ltd., and
> intended solely for the use of the individual or entity to whom they are
> addressed.
> If you have received this email in error please notify the system manager.
> This message contains confidential information of Toga Networks Ltd., and is
> intended only for the individual named. If you are not the named addressee
> you should not disseminate, distribute or copy this e-mail. Please notify the
> sender immediately by e-mail if you have received this e-mail by mistake and
> delete this e-mail from your system. If you are not the intended recipient
> you are notified that disclosing, copying, distributing or taking any action in
> reliance on the contents of this information is strictly prohibited.
> ----------------------------------------------------------------------------------------------
> --------------------------------------------------

-------------------------------------------------------------------------------------------------------------------------------------------------
This email and any files transmitted and/or attachments with it are confidential and proprietary information of
Toga Networks Ltd., and intended solely for the use of the individual or entity to whom they are addressed.
If you have received this email in error please notify the system manager. This message contains confidential
information of Toga Networks Ltd., and is intended only for the individual named. If you are not the named
addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately
by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not
the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on
the contents of this information is strictly prohibited.
------------------------------------------------------------------------------------------------------------------------------------------------