[ovs-discuss] Behaviour change in OpenVSwitch

[Alex Wang]

Hey,

Few questions,

1. how do you change the flow to output to port 2?  using
ovs-ofctl mod-flows?  Could you show the exact commands?

2. There was a commit (b2a4692 ofproto: Increase default datapath
max_idle time.) that increased the max_idle time of dpif flows.  That may
be related.

Thanks,
Alex Wang,

On Wed, Jun 3, 2015 at 10:37 PM, Tony van der Peet <
tony.vanderpeet at gmail.com> wrote:

> I use OpenVSwitch and occasionally upgrade from the tip of master. My
> previous upgrade was in Sep/2014, and I have just upgraded to last Friday's
> tip. A number of previously running test cases (using oftest) now fail for
> me, and I am investigating.
>
> The v1.3 test basic.OutputExact creates a flow outputting to port 1, then
> sends packets in ports 2, 3 and 4. The flow is then changed to output to
> port 2 instead. Since everything else about the flow is the same, this
> actually represents a change in the same flow (in my opinion) and therefore
> the dpif flows created when packets were received should now be invalid.
> However, when a packet is sent on port 3, instead of being output to port
> 2, it is output to port 1, causing the test to fail.
>
> I think what's happening is that the dpif flows are not being deleted when
> the flow changes. I am almost certain that this is not how the code used to
> behave. I have also tweaked the test to explicitly remove the flow before
> changing the output port, and this test passes.
>
> The questions I have are: Can anyone point me to the code change that
> might have introduced this behaviour? Is it a deliberate change or a
> by-product? While I could happily proceed by changing our regression test,
> I would rather see if this behaviour can be altered to behave the way it
> used to, which seems to me to be more conformant to the specification.
>
> Any advice gratefully accepted.
>
> Tony
>
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