Xilinx KCU105 User Manual page 64

User Space Application Software Components
The user space software component comprises the application traffic generator block and
the GUI. The function of the traffic generator block is to feed I/O buffers to the XDMA driver
for demonstrating raw I/O performance capable by the Expresso DMA.
The user space software interfaces with the XDMA driver through an application data driver
in the I/O path and directly with the XDMA driver to fetch performance data from hardware
performance monitoring registers.
The application data driver provides a character driver interface to user space software
components.
Graphical User Interface
The user space GUI is a Java-based interface that provides these features:
• Install/uninstall selected mode device drivers
• Gather statistics like power, PCIe reads/writes, and AXI reads/writes from the DMA
driver and display them in the Java GUI
• Control test parameters like packet size and mode (S2C/C2S)
• Display PCIe information such as credits, etc.
• Graphically represent performance numbers
• JNI layer of the GUI interacts with the application traffic generator and driver interface.
It is written in C++.
Application Traffic Generator
The application traffic generator is a multi-threaded application that generates traffic. It
constructs a packet according to the format of the application driver and includes these
threads:
• A TX thread allocates and formats a packet according to test parameters.
• A TX done thread polls for packet completion.
• An RX thread provides buffers to the DMA ring.
• An RX done thread polls for receiving packets. I
• A main thread spawns all these threads according to test parameters.
PCIe Streaming Data Plane TRD
UG920 (v2017.1) June 01, 2017
Chapter 5: Targeted Reference Design Details and Modifications
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