Linux/TMDSICE3359: PRU Ethernet switch implementation

Archer

Part Number: TMDSICE3359

Tool/software: Linux

Hello,

I'm new at using the PRU's. I am working with the linux-rt processor sdk and have implemented the PRU-ICSS Ethernet support. I have noticed in the industrial SDK PRU EthernetIP examples that there is the ability to remove the EthernetIP portion of the projects and implement a switch using the PRU's. Currently that supports RTOS, could that be implemented into linux-rt the PRU-ICSS Ethernet support? Since I am new to this i'm not sure exactly where to get started to accomplish this. My goal is to be able to select if I want the ports to be in a bonded mode or a switch mode. I can implement this on the board using hardware muxing and the Gig switch but it would be easier to switch between two PRU firmwares in software.

Any help and direction is greatly appreciated!

Thanks!

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The PRU Ethernet experts have been notified. They will respond here.

0 Archer over 8 years ago in reply to Biser Gatchev-XID

Prodigy 250 points

Any update on this?

Thanks!

0 David Zaucha over 8 years ago in reply to Archer

TI__Expert 7570 points

Hi Archer,

I apologize for the delay.
The EtherNet/IP adapter demo application is based on Molex EtherNet/IP stack on top of NDK TCP/IP stack .
I understand your question since EtherNet/IP is an industrial networking standard that takes advantage of commercial off-the-shelf Ethernet communication chips and physical media.

The Sitara Ethernet/IP implementation uses the PRU-ICSS to support the protocol with cut through Ethernet media-access-control to minimize jitter and maximize performance and to provide IEEE 1588 End to End support. Some additional information on the Ethernet/IP implementation is available at https://e2e.ti.com/blogs_/b/industrial_strength/archive/2016/02/25/how-to-select-the-right-industrial-ethernet-standard-ethernet-ip. and http://www.ti.com/lit/wp/spry249a/spry249a.pdf
Regretfully the PRU firmware for this implementation is not available in source form.

A good source of information on EtherNet/IP is ODVA.

David

0 Archer over 8 years ago in reply to David Zaucha

Prodigy 250 points

Hello David,

Thanks for the reply. The goal is to not use ethernetIP, but to implement a switch in the PRU-ICSS and select between a bonded mode or a switch mode in the ports. This can be done in hardware but I would like to avoid that (it takes up more GPIO). How can I implement a "soft switch" in the PRU-ICSS?

Thanks!

0 Schuyler Patton over 8 years ago in reply to Archer

TI__Mastermind 40730 points

From a Linux perspective port bonding and a switch are two different implementations. The kernel supports port bonding higher up in the network stack. I imagine a soft swith could be implemented higher in a user level daemon but at a significant cost to line rate. What type topology are you trying to implement? What type of redundancy do you want?

0 Archer over 8 years ago in reply to Schuyler Patton

Prodigy 250 points

The topology would be to switch between one device with a bonded connection to a switch. or run in the soft switch mode and daisy chain multiple devices together. The throughput would only need to be 10 Mbps at the soft switch, this topology would obviously have a limitation based on the number of daisy chained connections and this is understandable.

Thanks!

0 Archer over 8 years ago in reply to Archer

Prodigy 250 points

Any suggestion for a soft switch?

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Linux/TMDSICE3359: PRU Ethernet switch implementation