/sys/kernel was chosen ages ago and I completely forgot to move it to configfs. IBTRS is not a block device, so for some read-only entries (statistics or states) something else should be probably used, not configfs. Or it is fine to read state of the connection from configfs? For me sounds a bit weird.
Configs go via configfs, states and alike go to sysfs (but you need your own class device).
