tse (Triple speed ethernet) and SGDMA (Scatter Gather DMA) do not seem fully connecte

Those connections aren't controlled in software, they are made in hardware and are fixed.

What you need to find out is the memory mapping seen from the SGDMA memory mapped masters (m_read and m_write). That should tell you what memories the SGDMAs are connected to, and at what addresses. Then in the debugger, see if the driver is filling the descriptors with a memory address in the correct range.

The SGDMAs should send an IRQ when the transfer finished. Maybe you can test if this interrupt is fired or not.

And by the way you were right in your first message, the value that you see changing is indeed the received frames counter. But are you sure you are using the correct MAC address?