NLPx entry for network layer packet (Part 1)
- Entry:
- NLP
- VIT option:
- HPR
- Event:
- Network layer packet (NLP) sent or received
- VIT processing module:
- ISTITCHP
- Control is returned to:
- The module that issued the INTRACE macro
This trace record is written when a network layer packet
(NLP) is sent or received at the DLC layer. The NLPI and NLPO entries
provide, respectively, inbound and outbound information about the
NLPs, including the FID5 PIU and information about the network layer
header (control block ISTNLH) and the rapid transport protocol (RTP)
transport header (control block ISTTHDR). The NLP record is 32 bytes
in length, with up to 31 additional NLP2 continuation records, each
32 bytes in length.
- Byte (hex)
- Contents
- 00–03
- Record ID:
- C"NLPI" for inbound
- C"NLPO" for outbound
- 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
- Length of data (TSCILNG)
- 08–0B
- TSCB address
- 0C–0F
- DLC NCB address
- 10-13
- RPNCB address
- 14–17
- Related TSCB address:
- Continuation TSCB for inbound (0 if no continuation TSCB exists).
- Data TSCB for outbound (first TSCB in chain with TSCNLP off, 0 if no data TSCB exists).
- 18–1B
- Name of the module that issued this trace entry
- 1C–1F
- RPH address