Linux/TMS320DM365: smsc95xx Driver Issue

Jeff61040

Part Number: TMS320DM365

Tool/software: Linux

I'm running into an issue where sending an Ethernet frame of exactly 500 bytes to a LAN9513 connected to a DM365 causes the driver to stop receiving new packets. I can resolve the issue by running ifdown usb0 && ifup usb0, but obviously that's not much of a solution.

I've merged a few upstream patches into the kernel to try and fix the issue with no success so far. Based on the very specific frame size, I suspect it to be related to the change made in revision ec4756 for transmitting 500-byte frames. Does anyone have any insight into how to proceed here?

Reproducing the issue is as simple as running the following command, where x.x.x.x is the DM365's IP address:

ping -s 458 x.x.x.x

Any feedback would be GREATLY appreciated; this is a very critical issue for us.

over 8 years ago

0 Dwarakesh Radhakrishnan over 8 years ago

Guru 13660 points

Hi Jeff,

What software version are you using? Would suggest you try ZLP related patches upstream or in Arago git

0 Jeff61040 over 8 years ago in reply to Dwarakesh Radhakrishnan

Intellectual 270 points

Hi Dwarakesh,

Thank you for the very prompt reply. I am using RidgeRun's SDK, based on DVSDK version 4.02.00.06.

So far, I've merged the following changes from github.com/.../linux:

db443c4
d946092
8092880
11bc308
3c0f3c6
cf2acec
ec4756
603fe2b

I hadn't looked into Arago yet, but am doing so right now. Please let me know if there are any other resources you'd recommend.

0 Jeff61040 over 8 years ago in reply to Jeff61040

Intellectual 270 points

Oh, it looks like I left b4d562e off my list

0 Dwarakesh Radhakrishnan over 8 years ago in reply to Jeff61040

Guru 13660 points

Hi Jeff,

I was referring to **6.2. Zero-Length Packet status does not get updated when zlp packet received in grndis mode** in the following link: processors.wiki.ti.com/.../Sitara_Linux_MUSB_Issues

Though it is for a different processor(Sitara), it uses the same MUSB controller. You can give a try of this patch. It may not apply straight away, but you can port the same to DM36x CPPI_DMA, instead of CPPI41_DMA.

I have not yet cloned main line kernel and not able to spot the equivalent one in CPPI DMA which is older version to CPPI41 DMA

0 Jeff61040 over 8 years ago in reply to Jeff61040

Intellectual 270 points

I did not see any changes to drivers/net/usb, drivers/usb/core or drivers/usb/musb on Arago that looked interesting, besides the patches I've already integrated

0 Jeff61040 over 8 years ago in reply to Dwarakesh Radhakrishnan

Intellectual 270 points

Interesting – I had seen 8.1 on that page, but I ignored it because it only applies to ZLP transmission, not reception. Nothing similar seems to be in mainline (for CPPI41 or CPPI), though, and confusingly, my cppi_dma.c is very different from the versions in Arago and mainline. Specifically, I have some strange code in cppi_rx_scan that doesn't appear in either location.

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Linux/TMS320DM365: smsc95xx Driver Issue