Rare project developers

[Alexander Gall <>]

On Wed, 8 Jun 2022 08:24:30 +0200, Alexander Gall <> said:

> On Tue, 7 Jun 2022 11:49:53 +0200, mc36 <> said:

>> another idea, you support now onie_machine=model in /etc/machine.conf
>> please consider splitting it to two... let's say model_veth where the 
>> current
>> functionality would be exposed, and model_ext where you dont spin up the 
>> veth
>> creation but start with an external port map exposing the vm physical 
>> interfaces...
>> this way one could drop the image to gns3 and surround it with other 
>> boxes...
>> this is how i start my dataplane vm:
>> https://github.com/rare-freertr/freeRtr/blob/master/misc/p4bf/r1.sh
>> https://github.com/rare-freertr/freeRtr/blob/master/misc/p4bf/r2.sh
>> https://github.com/rare-freertr/freeRtr/blob/master/misc/p4bf/ports.json

> This is on my todo list. What I'm planning to do is to make the
> port-configuration JSON file (i.e. your ports.json) for the model
> configurable and have a wrapper that creates the veths specified in
> that file (if there are any).

Added in
https://bitbucket.software.geant.org/projects/RARE/repos/rare-nix/commits/89aa6ee7b467bd76c174313b41bc082968ce6c5e

With this, the freerouter systemd service is started with the
environment variable

TOFINO_MODEL_PORTINFO=/etc/freertr/ports.json

It only has an effect if RARE is running on the model pseudo-platform,
i.e. if /etc/machine.conf contains eiter onie_machine=model or
onie_machine=modelT2.

By default /etc/freertr/ports.json does not exist. In that case, the
model binary is started without "-f" and thus uses the built-in
portinfo files with the mappings

Tofino1:
  port 0 -> veth0
  port 1 -> veth2
  ...
  port 16 -> veth32
  port 64 -> veth250 (CPU port)

Tofino2:
  port 8 -> veth0
  port 9 -> veth2
  ...
  port 24 -> veth32
  port 2  -> veth250 (CPU port)

The wrapper script that starts the model and bf_switchd first creates
all of those veth pairs (and deletes them when the service is
stopped).

/etc/freertr/rtr-hw.txt maps the cpuport process to veth251.

If /etc/freertr/ports.json exists, it is passed to the model binary
with "-f /etc/freertr/ports.json". In addition, instead of creating
the default veth pairs, the wrapper for the model and bf_switchd also
parses the portinfo file and creates only those veth pairs specified
by the "PortToVeth" JSON objcets. For example

{
    "PortToVeth": [
        {
            "device_port": 8,
            "veth1": 0,
            "veth2": 1
        },
        {
            "device_port": 2,
            "veth1": 250,
            "veth2": 251
        }
    ]
}

will create the pairs veth0/veth1 and veth250/veth251. Interfaces
referred to by "PortToIf" objects must already exist or be created by
other means.

The CPU port must always be mapped to the pair veth250/veth251 due to
the fixed setting in rtr-hw.txt. The RARE profiles are compiled with
the CPU port assigned to port 64 for Tofino and 2 for Tofino2 (it
could be arbitrary but this choice is compatible with the default
ports.json files built into the model binary). Hence, the file must
always include

        {
            "device_port": 64,
            "veth1": 250,
            "veth2": 251
        }

for Tofino and

        {
            "device_port": 2,
            "veth1": 250,
            "veth2": 251
        }

for Tofino2.

--
Alex