Skip to content

Tools and Tutorials

Learn about some tools you can use and watch our OFP how-to videos

CODE COVERAGE

Generate code coverage report from unit tests by passing ‘–coverage’ during building, and use lcov to view the results:

./configure <typical-ofp-flags> CFLAGS='-g -O0 --coverage' LDFLAGS='-g -O0 --coverage'
 
make check
 
cd test/cunit
 
lcov --directory . --directory ../../src --capture --output-file coverage.info
 
genhtml coverage.info --output-directory out .. view out/index.html ..

TUTORIAL: UDP FORWARDING APPLICATION

This short tutorial shows some of the available OpenFastPath functionality including an UDP forwarding application using BSD sockets on a real ARMv8 system. The UDP echo application is available as an example in the git repository (location: example/udpecho).

Purpose

  • Show a working OFP application on a real ARMv8
  • Use OFP socket functionality to receive and send UDP data
  • Other OFP available features in demo:
    • Command line interface(CLI) to show statistics and interface configuration
    • ICMP protocol
    • Ethernet, IP and ARP processing
  • Use of standard Linux applications to instrument demo:
    • Netcat: UDP client application
    • Tcpdump: capture and analyze responses
    • Ping: check availability

Setup

The setup of the tutorial is represented in the image below

UDP forwarding setup

Video

Let’s get to the action, shall we?

[vc_video link=”https://youtu.be/BM7xhG9HVqY”]

Steps taken in the video

  1. Connect to Freescale LS2085ardb target where is running OpenFastPath UDP echo application.
  2. ifconfig eth0 – shows IP address(172.24.30.141) for the Linux interface used for Control/Debug
  3. Uname –a – shows the system information for the ARMv8 Freescale board running Linux
  4. Lower-right window: start interface capture
  5. Top-right window: connect to OpenFastPath Command Line interface on the target. This is found at port 2345 on IP 172.24.30.141.
  6. Show statistics. 1 packet received and 1 packet sent from the ARP discovery of target.
  7. Show OpenFastPath interface ip: 192.168.100.1
  8. Lower-left window: ping the target interface managed by OpenFastPath
  9. Show incremented statistics (2) on OFP CLI
  10. Top-left window: Connect to OpenFastPath UDP echo application. The application listens on port 2048
  11. Type a text message to send to OFP application then ENTER
  12. Message “ECHO:text sent” is received back
  13. Lower-right window: UDP packet sent to 192.168.100.1 port 2048 with data:”text sent“
  14. UDP ECHO packet sent from OFP application with modified data:”ECHO:text sent“
  15. Top-left window: statistics incremented (3) on OFP CLI