netdev - MPLS in Linux

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Message-ID: <CY1PR11MB041020E739DE80A007366A1193390@CY1PR11MB0410.namprd11.prod.outlook.com>
Date:	Tue, 5 Jul 2016 11:28:21 +0000
From:	Manish Chopra <manish.chopra@...gic.com>
To:	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	Roopa Prabhu <roopa@...ulusnetworks.com>
CC:	netdev <netdev@...r.kernel.org>
Subject: MPLS in Linux

Hello Folks,

I am trying to play a bit with MPLS on linux. I have basically two servers connected back to back [No switch/router in between those] using NIC devices.
Linux kernels are configured for MPLS and all required modules [mpls_gso, mpls_router, mpls_iptunnel etc.] are loaded on the setups.

To visualize it  - here is the configuration with my setup.

Host A                                     Host B
########|                 	|########
        Eth0  <===========> Eth1
########|                	|########
IP: 192.168.44.20           IP: 192.168.44.21    

I want to send MPLS packets/traffic between these NICs [Eth0 and Eth1] in the above mentioned scenario - is there any way to achieve this in back to back connection topology ??
If so, can anyone supply necessary configurations needs to be done on the hosts via iproute2 utility ??
Or can MPLS be tested only using routers topology, not with back to back connection ?

Another question I have is - which NIC offloads can be supported with MPLS ?

Thanks,
Manish