Are you likely to get it automatically if you run a recent stock Debian / Ubuntu / Alpine / Arch / Mint / whatever? Or do you have to do something specific to enable it?

> it does require driver changes which is a bit of a pain. By my count it is supported by more than fifty drivers

How do you check? Can you give an example of where the code's different in a driver that supports it and a driver that doesn't? It might be nice to have a Python script to analyze the kernel source tree and produce a list of which drivers support BQL, it might affect my purchasing decisions if I'm building a system I expect to have heavy network loads (media server / NAS or the like).