Enet Layer 2 CPSW Example

Table of Contents

• Introduction
• Supported Combinations
• Steps to Run the Example
  • Build the example
  • HW Setup
    • AM64X-EVM
      • For CPSW based example
    • AM64X-SK
      • For CPSW based example
  • Run the example
  • Sample output for Multiport example
• See Also

Introduction

The layer 2 cpsw example is dedicated to demonstrate usage of Enet CPSW3G peripheral operation.

On AM64X, we can do ethernet based communication using CPSW HW mechanism

• This is a standard ethernet switch + port HW

This example also demonstrates Rx Scatter-Gather. Due to the Limitation with LC-DMA, We need to prelink the buffers before submitting to the DMA to exercise scatter-gather.

This example do below:

• Target-side application running on a Cortex R5F core.
  • Target-side application running on a Cortex R5F core.
  • Application receives the packet, copies the payload into a new packet which is then sent back.
  • The application has a menu to enable/disable features, such as getting mac address and stats. This menu along with application logs are implemented via UART.
• Host-side functionality
  • Software applications like Colasoft Pkt Builder or packETH tool could be used to generate and send packets, Wireshark can be used to receive and verify packet contents
• The data path enabled in this example is as follows:
  • Host side (PC) application sends a packet to MAC port.
  • Target side application receives the packet, updates the MAC addresses in the Layer-2 header and sends the packet back.
  • Application like Wireshark (PC) receives the packet and can be seen in the capture window.

Attention

AM64xSK CPSW3G RGMII1 RX pins use IOset2 pinmux combination. In the system configuration file, use the default values for the RX signals of RGMII1 module and do not change the pins option.

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0_freertos
Toolchain	ti-arm-clang
Board	am64x-evm, am64x-sk
Example folder	examples/networking/enet_layer2_cpsw/V0

Steps to Run the Example

Build the example

• When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
• When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)

HW Setup

Note

Make sure you have setup the EVM with cable connections as shown here, EVM Setup. In addition do below steps.

AM64X-EVM

For CPSW based example

• Connect a ethernet cable to the EVM from host PC as shown below

Ethernet cable for CPSW based ethernet

AM64X-SK

For CPSW based example

• Connect a ethernet cable to the CPSW RGMII 1 port in AM64X-SK from host PC as shown below

Ethernet cable for CPSW based ethernet

Run the example

Attention

If you need to reload and run again, a CPU power-cycle is MUST

• Launch a CCS debug session and run the example executable, see CCS Launch, Load and Run
• You will see logs in the UART terminal as shown in the next section.
• We can start sending unicast packets from Colasoft Pkt Builder or packETH tool.
  • In the Colasoft Pkt Builder, click on Add icon , select any layer2 Packet and click ok.
  • Edit the source and destination address in the decode editor.
  • Click on send icon and select the ethernet adapater.
  • Click start, packets will be send to the target.
• Capture the packets in Wireshark.

Colasoft Pkt Builder to generate and send packets.

Sample output for Multiport example

==========================
     Layer 2 CPSW Test
==========================
Init Enet's OSAL and utils to use defaults
Init memory utils
Create clock and task for periodic tick
Create periodic tick task
Create periodic tick clock
Open Main UDMA driver
 
Init all peripheral clocks
----------------------------------------------
Enabling clocks!
 
Init all configs
----------------------------------------------
cpsw-3g: init config
 
Create RX tasks
----------------------------------------------
cpsw-3g: Create RX task
 
Open all peripherals
----------------------------------------------
cpsw-3g: Open enet
 
Attach core id 1 on all peripherals
----------------------------------------------
cpsw-3g: Attach core
cpsw-3g: Open port 1
cpsw-3g: Open port 1 link
cpsw-3g: Open DMA
initQs() txFreePktInfoQ initialized with 16 pkts
cpsw-3g: Waiting for link up...
MAC Port 1: link up
cpsw-3g: Port 1 link is up
cpsw-3g: MAC port addr: f4:84:4c:f9:88:c4
 
Enet L2 cpsw Menu:
 's'  -  Print statistics
 'r'  -  Reset statistics
 'm'  -  Show allocated MAC addresses
 'x'  -  Stop the test
 
m
 
Allocated MAC addresses
----------------------------------------------
cpsw-3g:        f4:84:4c:f9:88:c4
s
 
Print statistics
----------------------------------------------
  rxGoodFrames            = 92
  rxOctets                = 9156
  txGoodFrames            = 92
  txBcastFrames           = 4
  txMcastFrames           = 88
  txOctets                = 9156
  octetsFrames64          = 24
  octetsFrames65to127     = 134
  octetsFrames128to255    = 24
  octetsFrames256to511    = 2
  netOctets               = 18312
  txPri[0]                = 92
  txPriBcnt[0]            = 9156

• On Wireshark we can see the packets received:

Wireshark log for Layer 2 CPSW Example

See Also

Ethernet And Networking