[ovs-dev] [PATCH v7] Encap & Decap actions for MPLS packet type.

Eelco Chaudron echaudro at redhat.com
Fri Oct 15 11:40:39 UTC 2021



On 12 Oct 2021, at 6:23, Martin Varghese wrote:

> From: Martin Varghese <martin.varghese at nokia.com>
>
> The encap & decap actions are extended to support MPLS packet type.
> Encap & decap actions adds and removes MPLS header at start of the
> packet.
>
> The existing PUSH MPLS & POP MPLS actions inserts & removes MPLS
> header between ethernet header and the IP header. Though this behaviour
> is fine for L3 VPN where an IP packet is encapsulated inside a MPLS
> tunnel, it does not suffice the L2 VPN requirements. In L2 VPN the
> ethernet packets must be encapsulated inside MPLS tunnel.
>
> In this change the encap & decap actions are extended to support MPLS
> packet type. The encap & decap adds and removes MPLS header at the
> start of packet as depicted below.
>
> Encapsulation:
>
> Actions - encap(mpls(ether_type=0x8847)),encap(ethernet)
>
> Incoming packet -> | ETH | IP | Payload |
>
> 1 Actions -  encap(mpls(ether_type=0x8847)) [Datapath action - ADD_MPLS:0x8847]
>
>         Outgoing packet -> | MPLS | ETH | Payload|
>
> 2 Actions - encap(ethernet) [ Datapath action - push_eth ]
>
>         Outgoing packet -> | ETH | MPLS | ETH | Payload|
>
> Decapsulation:
>
> Incoming packet -> | ETH | MPLS | ETH | IP | Payload |
>
> Actions - decap(),decap(packet_type(ns=0,type=0)
>
> 1 Actions -  decap() [Datapath action - pop_eth)
>
>         Outgoing packet -> | MPLS | ETH | IP | Payload|
>
> 2 Actions - decap(packet_type(ns=0,type=0) [Datapath action - POP_MPLS:0x6558]
>
>         Outgoing packet -> | ETH  | IP | Payload|
>
> Signed-off-by: Martin Varghese <martin.varghese at nokia.com>

Thanks for following through!

Looking forward to see the follow on patch to also include the OVS_ACTION_ATTR_ADD_MPLS in TC, i.e. netdev_tc_flow_put().


Acked-by: Eelco Chaudron <echaudro at redhat.com>



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