[ovs-dev] [PATCH 2/3] netdev-linux: make tap devices persistent.

[Flavio Leitner]

On Tue, Jun 20, 2017 at 06:35:11AM +0000, Vishal Deep Ajmera wrote:
> Hi Flavio,
> 
> I did not configure IP address to the interface, simply brought up the interface br0 using ifconfig and see this issue consistently.
> 
> $ ifconfig br0 up

Well, that includes IPv6 automatically, so could you try reverting that patch
and see if the issue goes away?



> 
> Regards,
> Vishal
> 
> -----Original Message-----
> From: Flavio Leitner [mailto:fbl at sysclose.org] 
> Sent: Tuesday, June 20, 2017 12:32 AM
> To: Vishal Deep Ajmera <vishal.deep.ajmera at ericsson.com>
> Cc: dev at openvswitch.org
> Subject: Re: [ovs-dev] [PATCH 2/3] netdev-linux: make tap devices persistent.
> 
> Hi Vishal,
> 
> 
> On Thu, Jun 08, 2017 at 02:22:38PM -0300, Flavio Leitner wrote:
> > On Thu, Jun 08, 2017 at 11:24:58AM +0000, Vishal Deep Ajmera wrote:
> > > Hi Flavio,
> > > 
> > > I am facing some issue with ovs-master on Ubuntu 14.04 system. Here are the steps I followed and the error message I get. Can it be possibly related to your patch for making tap device persistent ? Let me know if I am missing some steps here.
> > > 
> > > 1. Create netdev bridge
> > > $ ovs-vsctl add-br br0 -- set Bridge br0 datapath_type=netdev $ 
> > > ovs-vsctl show
> > > 4c516433-c305-4894-96ad-f44af0b01b63
> > >     Bridge "br0"
> > >         Port "br0"
> > >             Interface "br0"
> > >                 type: internal
> > >     ovs_version: "2.7.90"
> > > 
> > > 2. Bring up br0 interface
> > > $ ifconfig br0 up
> > > 
> > > 3. Restart the openvswitch
> > > $ service openvswitch-switch restart
> > > 
> > > 4. Show ovs db
> > > $ ovs-vsctl show
> > > 4c516433-c305-4894-96ad-f44af0b01b63
> > >     Bridge "br0"
> > >         Port "br0"
> > >             Interface "br0"
> > >                 type: internal
> > >                 error: "could not open network device br0 (File exists)"
> > >     ovs_version: "2.7.90"
> > 
> > 
> > The same thing Eric reported to me when a test unit had failed.
> > Oddly I can't reproduce (yet), but reviewing the code seems that a 
> > rtnetlink to add a route can open the device but not add to the DP, 
> > then when it tries to that error would be reported.
> > 
> > I will look more into it and see if I can fix it.
> 
> I think I have reproduced the issue here and it only happens if you have an IP address on a port. Could you confirm that?
> 
> If so, OVS will receive rtnetlink msgs from each device with routes.
> That creates netdev objects before they are added to the datapath.
> Then when vswitchd is configuring the datapath, netdev_open() returns EEXIST error preventing the device to be added.
> 
> It looks like related to this commit:
> https://github.com/openvswitch/ovs/commit/67ac844b55d4c5f6bbfa01773c82b3d6d8b62131
> 
> Could you revert it and see if the issue goes away?
> 
> Thanks,
> --
> Flavio
> 
> _______________________________________________
> dev mailing list
> dev at openvswitch.org
> https://mail.openvswitch.org/mailman/listinfo/ovs-dev

-- 
Flavio