[ovs-discuss] problem with multiple pop_mpls

Adel Belkhiri adel.belkhiri at gmail.com
Thu Nov 14 16:39:05 UTC 2019


Hello again,

Thanks Ahmed and Tonghao for your replies.


Tonghao : IP packets are encapsulated By the MPLS protocol. After popping
the inner mpls header we will find the IP header. That's why i used
pop_mpls:0x800 to change the type of the ethernet frame.

Ahmed : Yes. I'm working with the kernel datapath. Normally since it
supports multiple pushing it should also support multiple popping. With
double popping the kernel datapath forward the packet to the ovs-vswitchd
but this latter could not handle it properly (may be because of a bug).


Best regards,
Adele


Le jeu. 14 nov. 2019 à 04:14, Ahmed Medhat <a.medhat.h at gmail.com> a écrit :

> Hi Adel,
>
> I expect you are using the kernel datapath type which has basic
> support to mpls. You can use the userspace datapath typeif you need
> multiple mpls pushing/popping.
>
> ovs-vsctl add-br br0 -- set bridge <bridge name> datapath_type=netdev
>
> Best regards,
> Ahmed
>
> On Wed, Nov 13, 2019 at 6:46 PM Adel Belkhiri <adel.belkhiri at gmail.com>
> wrote:
> >
> > Hi All,
> >
> > I have an issue with popping multiple mpls headers with ovs. The pushing
> via push_mpls works fine but the popping via pop_mpls triggers a warning in
> the log and the operation is not accomplished.
> >
> > |WARN|system at ovs-system: execute pop_mpls(eth_type=0x8847),pop_mpls
> (eth_type=0x800),2 failed (Invalid argument) on packet
> mpls,vlan_tci=0x0000,
> dl_src=ba:bd:0d:9d:c5:ee,dl_dst=ea:f5:19:d4:e2:4f,mpls_label=15,mpls_tc=0,mpls_ttl=64,mpls_bos=0,mpls_lse1=45376
> with metadata skb_priority(0),skb_mark(0), in_port(1) mtu 0
> >
> > I'm using the last version of OVS : 2.12.90. My OpenFlow rules are the
> following :
> >
> > sudo ovs-ofctl add-flow $S1
> "table=0,in_port=$S1_ETH2,eth_type=0x8847,mpls_bos=1,actions=pop_mpls:0x8847,resubmit(,0)"
> > sudo ovs-ofctl add-flow $S1
> "table=0,in_port=$S1_ETH2,eth_type=0x8847,mpls_bos=0,actions=pop_mpls:0x800,output:$S1_ETH1"
> >
> >
> > Any hint how to solve this?
> >
> > Many thanks.
> > Adele.
> > _______________________________________________
> > discuss mailing list
> > discuss at openvswitch.org
> > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
>
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