TSE or SGDMA related problem with concurrent tx and rx

Hi Daixiwen, thanks for answering me.

As I said before, I had the same problem both with TSE and with OpenCores MAC, which is what I currently use in this design.

Apart the mac, I use the standard uCOS/iniche.

I have two ethernet ports in my design.

The only diffence from standard usage is that on one port I send raw Ethernet packet eth the net->pkt_send function.

On other port I have no problems, but in this case I think the TCP protocol automatically fixes it.

Anyway, yesterday I found a way to solve the problem.

I defined ETH_OCM_SYNC_TX in OpenCores mac driver, so that drive syncronously transmits and blocks until frame is transmitted, rather than using interrupts.

It now uses the net->raw_send function rather then net->pkt_send.

Now everything is working perfectly; so it was really a driver problem when managing concurrent tx and rx data.

The performance has not decreased. I only have minimal performance drawbacks on the other ethernet port (the one using the tcp/ip stack), so I could use this as the final solution. I think I can also modify the driver in order to use sync mode only on the first port.

Regarding your message:

Version: I use Nios IDE 9.0sp2 with ucos and iniche which come with it.

Cache: I assumed the standard driver already flushed cache; I've not driver knowledge, so I don't know how to check if flushing is performed, nor how to force it.

Debug: same as above, I really don't know where I need to place the messages; maybe where putq and getq are called?

Cris