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P4 Tutorial
Introduction
Welcome to the P4 Tutorial!
We've prepared a set of four exercises that will help you get started with P4 programming:
Obtaining required software
If you are starting this tutorial as part of the P4 Developer Day, then we've already provided you with a virtual machine that has all of the required software installed.
Otherwise, to complete the exercises, you will need to clone two p4lang Github repositories and install their dependencies. To clone the repositories:
git clone https://github.com/p4lang/behavioral-model.git bmv2git clone https://github.com/p4lang/p4c-bm.git p4c-bmv2
The first repository (bmv2) is the second version of the behavioral model. It is a C++ software switch that will behave according to your P4 program. The second repository (p4c-bmv2) is the compiler for the behavioral model: it takes P4 program and output a JSON file which can be loaded by the behavioral model.
Each of these repositories come with dependencies. p4c-bmv2 is a Python
repository and installing the required Python dependencies is very easy to do
using pip: sudo pip install -r requirements.txt.
bmv2 is a C++ repository and has more external dependencies. They are listed
in the
README. If
you are running Ubuntu 14.04+, the dependencies should be easy to install (you
can use the install_deps.sh script that comes with bmv2). Do not forget to
build the code once all the dependencies have been installed:
$ ./autogen.sh
$ ./configure
$ make
You will also need to install mininet, as well as the following Python
packages: scapy, thrift (>= 0.9.2) and networkx. On Ubuntu, it would look
like this:
$ sudo apt-get install mininet
$ sudo pip install scapy thrift networkx