triple speed ethernet without external memory

Thank you very much for response, board consists of EP4SE230k (Stratix iv), I am using onchip memory (M9K) as memory for Nios processor. I am a beginer to this environment, I am explaning here, what is the task to be done through ethernet port, I am running some DSP algorithms (filtering, FFT, decision logics) using IP cores and some custom logic. I need to send control information from host PC to FPGA, as well as need to receive the processed results from FPGA to host PC. Now, can you suggest me best or better approach?