While researching this I found out that Intel also offers something similar with their "eSwitch" feature of their E810 cards. Since I had such a card on hand I also tried it out:
It offers a switchdev driver and rules just like the Mellanox card and you can use it with or without Open vSwitch to control the connection to your VMs and virtual functions. They also offer advanced rules and actions like VLAN-tagging and filtering on port numbers etc. The performance is even a few single-digit MBytes/s better than on the Mellanox card.
But there is one important limitation: virtual functions are tightly bound to one physical port. You can't bond the physical ports together or add them both into one big bridge. The driver complains and errors out when you try to do that. They also explain this limitation in their readme.
While they claim that their cards are highly flexible and can be reconfigured with firmware (they call it "DDP"), I'm not sure if this limitation is something that they can work around with software/gateware in the future or if it is a hard limitation of their ASIC.
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