P4 Model Repository
This repository maintains a sample set of the P4 programs and allows building P4 for the P4 Behavioral Model.
Important: git submodules
We often update the submodules for this repo. This is why we recommend that you run the following command whenever pulling the latest version of master:
git submodule update --init --recursive
Quickstart
To install all the Ubuntu 14.04 dependencies, run
./install.sh
Before running the simulator, you need to create veth interfaces that the simulator can connect to. To create them, you need to run:
sudo p4factory/tools/veth_setup.sh
To validate your installation and test the simulator on a simple P4 target, do the following:
cd p4factory/targets/basic_routing/
make bm
sudo ./behavioral-model
To run a simple test, run this in a different terminal:
cd p4factory/targets/basic_routing/
sudo python run_tests.py --test-dir of-tests/tests/
Mininet Integration
We provide a Mininet integration for one of our existing targets: simple_router
To run it, do the following:
cd p4factory/targets/simple_router/
make bm
./run_demo.bash
To install some table entries, run the following (in a different terminal):
./run_add_demo_entries.bash
You can then type commands in the Mininet CLI:
mininet> h1 ping h2
Building and Running a Target
Each P4 program (called a 'target') is set up in a directory under targets/. Inside the target directory is a Makefile with the instructions on how to build the behavioral model for that P4 program.
To build the target "project_name":
cd targets/project_name
make bm
This should result in an executable in the same directory called "behavioral_model"
Creating a New Target
To add a new target, cd to targets/ and run:
p4factory/tools/newtarget.py project_name
where project_name is the name of the P4 program (without the .p4 extension). This will create a new directory in targets/ called project_name/, set it up to build the behavioral model, and create a template for the P4 program there named project_name.p4. Then, edit that file or copy your P4 program to that file and make in that directory.
P4 Dependency Graph Generator
The relationships between tables of more complex P4 program can be difficult to comprehend. The p4c-graphs utility parses through the the P4 program and generates a dependency graph using graphviz. The dependency graph can be generated with the following command:
p4c-graphs <p4 code>
The resulting files can be viewed using xdot or with a PNG viewer.