@htibosch Yes, the reception is working very well. Only when doing reverse sending, the iPerf will become 0.00 bit/s. Can you please help to check the xNetworkInterfaceOutput() and all code that is executed after that?
Please find some remarks in this version:
NetworkInterface.tips.zip (4.9 KB)
I like the way you have implemented zero-copy reception, that is very original.
I mean the code in prvNetworkInterfaceInput(). You swap the contents pucEthernetBuffer with the DMA field pxReceiveBuffer->to.
I wrote some remarks about sending packets in a zero-copy way. Make sure you get the ownership right. Starting a transfer of a buffer means that you transfer the ownership to “DMA”. Only when DMA (TX) is ready, the descriptor can be released.
My comments all appear as a // comment.
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