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I want to use ethernet to send data from FPGA to PC and PC to FPGA via NIOS.
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Where exactly does the data come from? Since it's already on fpga it should be straightforward for Nios to read it and sent it to ethernet.
As I said before, I guess the data is stored into registers or onchip ram; in this case you only need share it or provide dual port access and connect to Nios data bus.
If your data comes from any other source, like a serial port or PIO, you only need to add the proper interface component in Qsys and, again, connect to Nios on the other side.
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