prog-test-run

Chapter 7: Testing XDP programs

• A full description of this example can be found in Chapter 7. It explains the various steps better and walks you through the code here.
• Please remember that the examples here are tested in the Vagrant machine. Please read more in README.md.
• Make sure to change the example accordingly if you wish to build somewhere else, open an issue if you have problems doing so!
• All the dependencies are already handled if you followed the instructions in the main README.md.

Before reading this, make sure you follow the instructions to create the Vagrant machine so all the dependencies are already handled, see the main README.md.

In the vagrant machine:

Enter into this example folder:

cd ~/linux-observability-with-bpf/code/chapter-7/prog-test-run

First let's gather some dependencies.

We already have the BCC python library, coming from the BCC package provisioned in the Vagrantfile, but we need to install scapy.

sudo pip3 install scapy

Now we can take a look at our program.c, this program has different actions based on the destination mac address and packet type. What we want to achieve, is to write a test suite to verify that the program behaves correctly.

Our test suite is defined in the test_xdp.py program, let's run it:

sudo python3 test_xdp.py

Expected output:

...
----------------------------------------------------------------------
Ran 3 tests in 5.618s

OK

Try to play with the XDP program in program.c and run the test suite again, what happens?