mpc_level indicates the level of MPC connection, and can be one of the following:

• HPDT indicates that the connection is capable of performing channel I/O directly to or from communications storage manager (CSM) buffers.
• NOHPDT indicates that the connection is not capable of performing channel I/O directly to or from CSM buffers.
• QDIO (Queued Direct I/O) indicates that the connection performs channel I/O operations using direct I/O instead of CCW channel operations. An MPCLEVEL of QDIO implies that the connection is also HPDT capable, and can perform the direct I/O to or from CSM buffers.

mpc_usage indicates whether the MPC connection can be used exclusively by only one upper-layer protocol (ULP), or shared by multiple ULPs. It can be one of the following:

• If mpclevel is QDIO or HPDT, mpc_usage is:
  • SHARE indicates that the connection can be shared by multiple ULPs.
  • EXCLUSIVE indicates that the connection can only be used by the first ULP that requests usage of the MPC connection.
• If mpclevel is NOHPDT, mpc_usage is ***NA***.