[ovs-dev] Q on ovs-dpdk + Vxlan user space tunneling

Ravi Kerur rkerur at gmail.com
Sun Oct 14 14:51:16 UTC 2018


Hello Daniel,

Thank you for your quick response and explanation on br-phy to br-int. I
will gather debug logs and update.

Thanks.
Ravi

On Sun, Oct 14, 2018 at 6:19 AM benli ye <danielbenliye at gmail.com> wrote:

> Hi Ravi,
>
> Let me try to answer your question.
> (1) For the first one: I believe NORMAL action can lead the packet to
> tunnel port.
> (2) For how packets flow from br-phy to br-int, You can search code
> “terminate_native_tunnel()” in ofproto-dpif-xlate.c.
>      When it generates datapath flow for an incoming tunnel packet, a
> OVS_ACTION_ATTR_TUNNEL_POP is inserted in the actions.
>      When the encapsulated packet hit OVS_ACTION_ATTR_TUNNEL_POP action,
> it will be handled to tunnel port on br-int as a re-injected packet.
>      Then tunnel headers can be split and delivered to corresponding
> interface in br-int. When packet sent out from br-int to br-phy, it will
> hit the tnl_push action which
>      is added when computing output action (see native_tunnel_output()),
> then it will use the route you added to send the encapsulated packet from
> br-phy interface.
> (3) That’s a historic issue as it copied from an original guide. I believe
> your assumption is right.
> (4) I don’t try this command, I think more log information in
> /var/log/openvswitch may be helpful. Hope someone have this answer.
>
> Thanks,
> Daniel Benli Ye
>
> > On Oct 14, 2018, at 8:55 PM, Ravi Kerur <rkerur at gmail.com> wrote:
> >
> > Hi,
> >
> > I am going through following link and setting up the testbed
> >
> > http://docs.openvswitch.org/en/latest/howto/userspace-tunneling/
> >
> > and it is very confusing to me at least. Can someone please clarify
> > following questions?
> >
> > (1) I believe flows needs to be programmed on br-int bridge with
> > in_port=vm_port0, out_port=vxlan0, vice-versa. When bridge is created it
> > has a default flow with NORMAL action, i don't think this suffices?
> >
> > (2) How do packets flow from br-int to br-phy and br-phy to br-int?
> >
> > (3) Link says add following route
> >
> > "ovs-appctl ovs/route/add 172.168.1.1/24 br-eth1"
> >
> > What is br-eth1? I don't see anything about it in the link?
> >
> > (4) Assuming br-eth1 is br-phy, I tried to add route on the testbed I
> > am configuring I get
> >
> > ovs-appctl ovs/route/add 11.11.11.4/32 br1-phy
> > Error while inserting route.
> > ovs-appctl: ovs-vswitchd: server returned an error
> >
> > Thanks.
> > _______________________________________________
> > dev mailing list
> > dev at openvswitch.org
> > https://mail.openvswitch.org/mailman/listinfo/ovs-dev
>
>


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