[hdgvhicv]

Most 2110 kit relies on narrow timing. That means packets arriving and leaving in a window on the order of 10 microseconds. Doing that in software reliably for your typical 100gbit interface is challenging.

[breezykoi]

Challenging but certainly doable with kernel bypass technologies and dedicated CPU cores.

[Sesse__]

It generally also needs help from the NIC, to pace out the packets at the right timestamps. (Typically delivered as part of said bypass technologies.)