Can I turn a computer into a network switch/router?

I have 3 computers that I want to connect via 100Gbe network connections. 2 of the computers/servers are equipped with Mellanox ConnectX-4 single adapters and one computer is equipped with a dual ConnectX-4 adapter that has two QSFP28 connectors. The purpose of the latter computer is to function as storage server. So far I connect the other two machines each directly with the storage server and it works.

However, the two machines that connect to the storage server cannot communicate with each other. My question is: Can I configure the storage server, which houses the dual ConnectX-4 adapter and which connects to each of the two machines directly, in a way so that the two machines can communicate with each other via some sort of bridge on the storage server? Obviously I still want each of the machine to have access to the storage server but also want each of the machines to be able to communicate with each other.

My OS is Windows 10 for Workstatations for all machines but I am willing to consider a full-fledged Windows Server OS if it solves my problem but W10fWS does not.

Edit: This is not a data center or production environment but for experimental purpose. 100G switches are incredibly expensive for a small lab environment and only 3 machines hence my wanting to solve this issue on the software side.