As different nvme controllers are connect via different fabrics, some require different timeout settings than others. This series implements per-controller timeouts in the nvme subsystem which can be set via sysfs.
How much of a real issue is this? block io_timeout defaults to 30 seconds which are considered a universal eternity for pretty much any nvme fabric. Moreover, io_timeout is mutable already on a per-namespace level. This leaves the admin_timeout which goes beyond this to 60 seconds... Can you describe what exactly are you trying to solve?
