WIP: added eth_200g IP

applications/rdma_demo/libraries/rdma_packetiser/cocotb/tb_rdma_packetiser.py

@@ -318,13 +318,17 @@ async def tb_rdma_packetiser(dut):
         dut._log.debug("src_out data = \n%s", hexdump(data))
 
         # Verify icrc        
+        icrc = int.from_bytes(packet[-4:], "big")
+
         # calculation of icrc is done as in:
         # https://github.com/secdev/scapy/blob/master/scapy/contrib/roce.py
         # ICRC could be calculated using the scapy library (if installed) with the code below.
-        #   from scapy.layers.l2 import Ether        
-        #   from scapy.contrib.roce import BTH # for compute_icrc function        
-        #   exp_icrc = int.from_bytes(Ether(packet)['BTH'].compute_icrc(None), 'little')        
-        icrc = int.from_bytes(packet[-4:], "big")
+        try:
+            from scapy.layers.l2 import Ether        
+            from scapy.contrib.roce import BTH # for compute_icrc function        
+            Ether(packet).show() # print packet if scapy is installed.
+            exp_icrc = int.from_bytes(Ether(packet)['BTH'].compute_icrc(None), 'little')        
+        except ModuleNotFoundError:
             ones = (0xFF).to_bytes(1, 'little')
             pseudo_packet = ([ones] * 8 + [packet[14:15]] + 
                              [ones] + [packet[16:22]] + [ones] +