Running Trellis with P4Runtime with P4 Switch

[Sreenivasulu Saya]

Hi All,

I am trying to run Trellis topology with a P4 switches controlled by ONOS. I have ONOS ver 2.3.0 running on my local machine.

I have cloned the routing repo and I see that there is Python script trellis.py in routing/routing/trellis directory. I also see there is a trellisp4.py as well in the same directory.

I tried to run the command:

   $ sudo -E ./trellisp4.py --onos-ip=127.0.0.1

expecting it to connect to ONOS running on the local machine. I got the following error:

------------

*** Starting 4 switches

s204 .......................................................................................................................................................................................................

--------------------------------------------------------------------------------

s204 log (from /tmp/bmv2-s204-log):

simple_switch_grpc --device-id 1 -i 1@s204-eth1 -i 2@s204-eth2 -i 3@s204-eth3 -i 4@s204-eth4 --thrift-port 33805 --log-console -Lwarn --no-p4 -- --cpu-port 255 --grpc-server-addr 0.0.0.0:49657

--------------------------------------------------------------------------------

simple_switch_grpc: No such file or directory

Traceback (most recent call last):

  File "./trellisp4.py", line 103, in <module>

    main(args)

  File "./trellisp4.py", line 88, in main

    net.start()

  File "build/bdist.linux-x86_64/egg/mininet/net.py", line 549, in start

  File "/home/sayasree/Work/onos/tools/dev/mininet/bmv2.py", line 341, in start

    self.waitBmv2Start()

  File "/home/sayasree/Work/onos/tools/dev/mininet/bmv2.py", line 427, in waitBmv2Start

--------------------------------------------------------------------------------

From the above log, I see that it is not able to find the 'simple_switch_grpc'. I tried building th  'simple_switch_grpc' from the P4C Behaviral-Model repo, I got some compile errors.

Is there any easier way to get the Trellis topology with P4 switches simulated by Mininet?

Any pointers would be greatly appreciated.

Regards,

  --Sreeni Saya

[Carmelo Cascone]

Hi Sreeni,

Here's a guide to run Trellis with Mininet and BMv2 (P4 software switch):

https://wiki.onosproject.org/display/ONOS/Try+fabric.p4+with+ONOS+and+bmv2

Hope it helps,

Carmelo

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[Sreenivasulu Saya]

Hi Carmelo,

I downloaded the ONOS+P4 Dev VM from the link: https://wiki.onosproject.org/display/ONOS/Try+fabric.p4+with+ONOS+and+bmv2

When I tried to start the VM in VirtualBox, I am getting the following error:

---------------

Failed to open a session for the virtual machine ONOS+P4 Dev (2019-05-16) 1:
RawFile#0 failed to create the raw output file /Users/carmelo/workspace/onos/tools/dev/p4vm/ubuntu-bionic-18.04-cloudimg-console.log (VERR_FILE_NOT_FOUND).
Result Code:
NS_ERROR_FAILURE (0x80004005)
Component:
ConsoleWrap
Interface:
IConsole {872da645-4a9b-1727-bee2-5585105b9eed}

---------------

Looks like the directory /Users/carmelo ha sbeen hardcoded in the VM and hence it is failing to start.

Regards,
  --Sreeni Saya

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[Sreenivasulu Saya]

Hi Carmelo,

I followed the instruction given in the page: https://wiki.onosproject.org/display/ONOS/Try+fabric.p4+with+ONOS+and+bmv2

I ran the following docker command:

docker run --rm -it --privileged -v /tmp/p4mn:/tmp \

    -v${WORKSPACE}/routing:/routing -w/routing/trellis \

    --name p4trellis --hostname p4trellis \

    -p 50001-50030:50001-50030 \

    --env PYTHONPATH=/root \

    --entrypoint python opennetworking/p4mn:stable trellisp4.py --onos-ip 127.0.0.1

and the I got the mininet prompt. At the prompt, the 'pingall' command is failing for all the hosts. I am able ot see the Trellis topology in the ONOS Web GUI2. 

I ran the following commands as well:

-------------

$ cd /tmp/p4mn

$ onos-netcfg localhost bmv2-s204-netcfg.json

$ onos-netcfg localhost bmv2-s205-netcfg.json

$ onos-netcfg localhost bmv2-s226-netcfg.json

$ onos-netcfg localhost bmv2-s227-netcfg.json

-----




I suspect that the configuration  in trellisp4.json or the IP addresses assigned to h1, h2, h3, h4 in the trellisp4.py file might be incorrect.

I had cloned the repo with the command: git clone https://github.com/opennetworkinglab/routing/

In the mininet h1, h2 has the following IP addresses:

mininet> py h1.IP()
10.0.0.1
mininet> py h2.IP()
10.0.0.2

 but in the trellisp4.py, the h1 is created with the folllowing:

        h1 = self.addHost('h1', cls=RoutedHost, mac='00:aa:00:00:00:01', ips=['10.0.2.1/24'], gateway='10.0.2.254')

        h2 = self.addHost('h2', cls=TaggedRoutedHost, mac='00:aa:00:00:00:02', ips=['10.0.2.2/24'], gateway='10.0.2.254', vlan=10)

I think, the ping is failing due to the mismatch of the IP subnets. I would greatly appreciate if you could confirm whether the configuration and the IP addresses are correctly configured.

Regards,
  --Sreeni Saya

On Mon, Sep 2, 2019 at 11:41 PM Carmelo Cascone <car...@opennetworking.org> wrote:

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