Name
rio_disc_mport — 
     Start discovery through a master port
 
Arguments
- mport
- 
     Master port to send transactions
     
- flags
- 
     discovery control flags
     
Description
   Starts the discovery process. If we have an active link,
   then wait for the signal that enumeration is complete (if wait
   is allowed).
   When enumeration completion is signaled, start recursive
   peer discovery. Returns 0 if discovery succeeds or -EBUSY
   on failure.