Arria10 PCIe need two DMAs, (one for data moving ; the other for control msg transfer)

Hi,

You can refer to the following link chapter 30 for the detail of the MSGDMA:

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_embedded_ip.pdf

This depends on your application and requirement to customize the arbitrator and descriptor controller. Hence, I might not able to provide further design recommendations.

Regards -SK