[ovs-discuss] Test OVS kernel module using only one machine

Ahmed Talha Khan auny87 at gmail.com
Tue Dec 18 14:30:36 UTC 2012

How do i use them if they are not on the host? I mean these are not
eth0/eth1 type actual interfaces, so how will they be visible on the host
until i make some device myself? How do you propose that I add the port.

On Tue, Dec 18, 2012 at 7:22 PM, Kyle Mestery (kmestery) <kmestery at cisco.com
> wrote:

> On Dec 18, 2012, at 8:19 AM, Ahmed Talha Khan <auny87 at gmail.com> wrote:
> >
> > I am not aware of the internal port functionality. Can you kindly
> elaborate your answer a bit more. Also what do you mean by "add IP
> configuration on your bridge port"? How will that help in sending traffic
> in?
> >
> Internal ports are internal ports created in OVS on the bridge. You can
> use them on the host itself for different purposes, one of which is you can
> apply IP configuration onto them. For the VXLAN testing I did, I would use
> this functionality, for example. If you test does not require IP, then just
> configure the port up and send traffic into it. Add another internal port
> to receive the traffic on.
> >
> > On Tue, Dec 18, 2012 at 7:14 PM, Kyle Mestery (kmestery) <
> kmestery at cisco.com> wrote:
> > On Dec 18, 2012, at 7:58 AM, Ahmed Talha Khan <auny87 at gmail.com> wrote:
> > > Hey Ben,Jesse,Kyle,ALL,
> > >
> > > I made some changes in the kernel module and would like to test them.
> Ideally I would want to test it on a single machine that i am on without
> firing up other vms(eg kvm/qemu integration). I would like to know what is
> the preferred method used by the community for this.
> > >
> > > I thought of using a combination of tcpreplay and TAP devices to
> achieve this. I only want send traffic into ovs-port 1, receive it in the
> kernel mod, and send it out to  ovs-port 2 after doing my processing.
>  Since I was trying to use tcpreplay,which is an out-bound utility(sends
> traffic out of the stack), I need to make some interface on which i replay
> this traffic. I made a TAP interface for this, since that can be used to
> inject packets into the network stack. The problem is that when i replay
> the traffic on this TAP device it is not received inside OVS obviously
> because the TAP device only sends up the traffic to kernel but ovs will not
> receive it since it  is not coming form any OVS port.
> > >
> > > Then there is a way to make 2 TAP devices, bridge them, play traffic
> on one of them and add the 2nd one to ovs. But that is not possible since
> OVS and linux bridge module cannot co-exist.
> > >
> > > So the questions is how to input traffic into ports, in a
> non-programmatic way, without external vms.
> > >
> > > Also, are there any tests in the /test directory to test the datapath
> functionality independent of the userland ovs code?
> > >
> > I usually just use OVS internal ports for this. Either add IP
> configuration on your bridge port itself, or just create another internal
> port and use that for your tests.
> >
> > Thanks,
> > Kyle
> >
> > >

-Ahmed Talha Khan
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