117. Sample Application Tests: RX/TX Callbacks¶
The RX/TX Callbacks sample application is a packet forwarding application that demonstrates the use of user defined callbacks on received and transmitted packets. The application performs a simple latency check, using callbacks, to determine the time packets spend within the application.
In the sample application a user defined callback is applied to all received packets to add a timestamp. A separate callback is applied to all packets prior to transmission to calculate the elapsed time, in CPU cycles.
117.1. Running the Application¶
Open common_base and set CONFIG_RTE_ETHDEV_RXTX_CALLBACKS=y
.
To run the example in a linuxapp
environment:
./build/rxtx_callbacks -c 2 -n 4
Refer to DPDK Getting Started Guide for general information on running applications and the Environment Abstraction Layer (EAL) options.
117.2. test_rxtx_callbacks¶
Running:
./examples/rxtx_callbacks/build/rxtx_callbacks -c 2 -n 4
waked up::
Core X forwarding packets.
Send one packet on Port0,check the port1 receive packet. It receive one packet that the port0 send.