253. 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.
253.1. Running the Application¶
CONFIG_RTE_ETHDEV_RXTX_CALLBACKS=y in config/common_base.
To run the example in a
./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.
253.2. Test Case:rxtx callbacks¶
Run the example:
./examples/rxtx_callbacks/build/rxtx_callbacks -c 2 -n 4
Core X forwarding packets.
Send one packet from port0,check the received packet on port1. Should receive the packet sent from port0.