How a single tofino switch is virtualized into two switches?

[chocolate0515]

HI Sir
Now it compiles smoothly.
Thanks for your help
But I would like to ask another question.
How a single tofino switch is virtualized into two switches?

[Scofield626]

Don't get lost by virtualization. In essence, what authors do is implementing a virtSwitch control at data plane and properly defining table entries (port, addr, in table_setup.py) to identify the logical/virtual switches. Btw, there is a couple of typos in table_setup.py, please refer to my issue.