MPDU entry for MPC PDU processing
- Entry:
- MPDU
- VIT option:
- CIA
- Event:
- Inbound or outbound PDU over high performance data transfer
- VIT processing module:
- ISTRACCI
- Control is returned to:
- ISTTSCDP and IUTLLCMB for inbound processing or ISTTSC88 for outbound processing
The MPDU trace record shows outbound and inbound MPC PDU
processing of CSM buffers.
- Byte (hex)
- Contents
- 00–03
- Record ID: C"MPDU"
- 04
- ID is the primary address space ID (ASID). This field is 0 if the ASID is greater than X'FF'.
- 05
- 0
- 06–07
- PDU moved data length
- 08–0A
- PDU total data length
- 0B
- PDU header flag byte (See ISTPDHDR - PDHFLAGS)
- 0C
- Protocol ID (See ISTPDHDR - PDHPID)
- 0D–0F
- PDU route action word
- OSD
- Outbound data
- IRS
- A PDU is routed to MPC DLC user.
- IRG
- A PDU is routed to MPC DLC user with queued PDUs.
- ICF
- The first M2A wait entry is created with the PDU.
- ICA
- A PDU is queued to a new M2A entry. The new M2A entry has a backward chain to an existing M2A entry.
- ICB
- A PDU is queued to a new M2A entry. The new M2A entry has a forward chain to an existing M2A entry.
- IEE
- Enterprise extender input.
- IQH
- A PDU is queued to a head of the M2A entry.
- IQT
- A PDU is queued to a tail of the M2A entry.
- IQC
- A PDU is queued to M2A entry. Two M2A entries are combined into one M2A.
- IDP
- A duplicate PDU is discarded.
- ICT
- Connection termination is requested.
- OEE
- Enterprise extender output.
- 10–13
- PDU sequence number or X'00000000' for CNLS PDU
- 14–17
- Address of the first ISTXBFLST
- 18–1B
- Address of the PDU header
- 1C–1F
- Address of VTAM® RPH