Jason Thorpe <thorpej@wasabisystems.com> writes:

> Currently, bus_dma(9) has no real special support for "control data",
> i.e. buffer descriptors used for network interfaces, s/g lists for
> disk controllers, etc.  However, because of the nature of control
> data, it sometimes requires special handling.

Could you elaborate a bit on the "nature of control data" and "special
handling", because I don't quite see what the problem is. I would
prefer, in particular, that the name of this feature in the bus_dma(9)
interface reflect what it does, rather than what it is intended to be
used for.

        - Nathan