[ovs-discuss] Flow-Mode Userspace GRE Tunneling

[David Griswold]

The patch works. Thanks for that.

One other anomaly I noticed when displaying tunnel ports:

## port-mode tunnel port, looks good.
##
ovs-appctl tnl/ports/show
Listening ports:
gre_sys (2) : eth_type(0x0800),ipv4(proto=47,frag=no)

## flow-mode tunnel port, port type is garbled
##
ovs-appctl tnl/ports/show
Listening ports:
���  (2) : eth_type(0x0800),ipv4(proto=47,frag=no)



-----Original Message-----
From: Jesse Gross [mailto:jesse at nicira.com]
Sent: Wednesday, June 24, 2015 6:00 PM
To: David Griswold
Cc: discuss at openvswitch.org
Subject: Re: [ovs-discuss] Flow-Mode Userspace GRE Tunneling

On Wed, Jun 24, 2015 at 1:40 PM, David Griswold <David.Griswold at overturenetworks.com> wrote:
> I’m trying to get flow-mode tunneling working with native GRE
> tunneling.  I have a 2 port switch, access and trunk (tunnel) with the
> 2 ports connected to test gear. The problem is that the
> trunk-to-access direction is not working. It looks like packets are
> egressing from b1 on port NORMAL, where they disappear.
>
> When I configure port-mode tunneling, everything works and I notice
> that b1 does not egress to port NORMAL but ingresses directly to b0 from b1.

I think I see the problem, a check from port based tunneling was carried over to the more general native tunneling case. I just sent out a patch, can you please try it out?

> Another observation is that when it is working for port mode
> tunneling, the call to “tnl_port_should_receive” in function “xlate_lookup_ofproto_”
>
> sometimes return “true”. For flow mode tunneling, this function always
> returns “false”.

This check only tests to see if a flow has tunnel IP addresses, which should be true for all decapsulated packets. I guess you are probably looking at this on the physical bridge, where the packet hasn't been decapsulated yet? The "sometimes" for port based tunnels would depend on whether the packet has been decapsulated yet and the never for flow based tunnels is because the process fails before decapsulation.


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