v0.1.0-custom-header
Add Custom Header.
Core modification: custom-header, custom-p2p-net-device
PS: The p4-sim can simulate the custom-defined header, check the example p4-custom-test.cc, which implements the Tunnel for the forwarding, without that tunnel, the flow will go through all the switches, with the tunnel, it will only pass the switch 0 and 1, in that case, shorten the flow path. Now we also support the CSMA channel and P2P channel by P4GlobalVar::g_channelType.