PROCESSOR-SDK-AM64X: XDP Support

Artur Toews

Prodigy 150 points

Part Number: PROCESSOR-SDK-AM64X

Hello,

do you support XDP in the CPSW driver for am64xx? For the previous cpsw it seems to be implemented.

over 4 years ago

0 Schuyler Patton over 4 years ago

TI__Mastermind 40730 points

Hi,

I apologize for the delay in responding. Currently as you noticed the support does not appear to be in the AM64x CPSW driver.

Best Regards,

Schuyler

0 Artur Toews over 4 years ago in reply to Schuyler Patton

Prodigy 150 points

Hi,

Is it on the roadmap?

Best,

Artur

0 Schuyler Patton over 4 years ago in reply to Artur Toews

TI__Mastermind 40730 points

Hi,

Currently adding this capability is not on the roadmap. Is there an application that you had in mind?

Best Regards,

Schuyler

0 Artur Toews over 4 years ago in reply to Schuyler Patton

Prodigy 150 points

Hi,

We want to run a PN Controller an this device. We already tried it with codesys, but the ethernet is a bottleneck.
Therefore we search for a "express path" for PN traffic.

0 Schuyler Patton over 4 years ago in reply to Artur Toews

TI__Mastermind 40730 points

Hi,

Would you be able to provide a little more feedback on the bottleneck that you are experiencing with CODESYS? Is this an industrial protocol application performance that you are working on?

Best Regards,

Schuyler

0 Artur Toews over 4 years ago in reply to Schuyler Patton

Prodigy 150 points

Hi,

Yes, PN=PROFINET is an industrial protocol.

The Application is CODESYS as PN Controller connected to multiple PN Devices.

0 Schuyler Patton over 4 years ago in reply to Artur Toews

TI__Mastermind 40730 points

Hi,

As I mentioned at the moment there is not an XDP option on AM64. So I would like to ask some additional questions on the setup.

- Are you using RT Linux?

- Are you using the Default TI SDK filesystem?

- Are you using a TI EVM?

- Are you doing any core isolation/shielding?

Best Regards,

Schuyler

0 Artur Toews over 4 years ago in reply to Schuyler Patton

Prodigy 150 points

Hi,

- Are you using RT Linux? - >Yes

- Are you using the Default TI SDK filesystem? - Yes

- Are you using a TI EVM? - Yes

- Are you doing any core isolation/shielding? - No

0 Schuyler Patton over 4 years ago in reply to Artur Toews

TI__Mastermind 40730 points

Hi,

Would you be able to try the TI tiny file system? I am not sure though if there is all the lib support necessary for CODESYS in the tiny file system. The default file system launches several daemons that include network traffic on ethernet ports. Also there are some steps that can be used to raise priority of softirq tasks and perhaps core isolation. Are you familiar with how to do that?

Best Regards,

Schuyler

0 Artur Toews over 4 years ago in reply to Schuyler Patton

Prodigy 150 points

Hi,

No I'm not familiar with core isolation. I could figure it out, but I would also be happy to get the instruction :-).

To change the softirq prio i would use "chrt" if you have no other proposal.
Can you tell me at which softirq tasks I have to raise the priority?

+1 Schuyler Patton over 4 years ago in reply to Artur Toews

TI__Mastermind 40730 points

Hi,

The tasks to be raised are the networking ksoftirqs. On my system using the ps command my ksoftirqs are 9 and 20, (ksoftirq0 and ksoftirq1).

chrt -p <ksoftirq pid #> will return the current scheduling policy and priority, should see something like SCHED_OTHER and priority 0. To set to a higher priority try: chrt -f -p 52 9. This should change the priority to 52 and scheduling policy to FIFO for pid 9. Then you would the same for ksoftirq1. Any prority above 50 is now higher than the kernel priority so please bear this in mind.

I will have an example for single shell boot tomorrow.

Best Regards,

Schuyler

0 Artur Toews over 4 years ago in reply to Schuyler Patton

Prodigy 150 points

Hi,

I tested the core isolation and changing the prio of the ksoftirqd and had success.

Thank you.

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PROCESSOR-SDK-AM64X: XDP Support