VRTBK Back to Index page
 
Prolog 
Control Block Contents 
   VRTBK DSECT
   VRTBLE DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  VRTBK Prolog Top of page
  
 NAME       : HCPVRTBK
 DESCRIPTION: VSWITCH Stage I Routing Table
 DSECT      : VRTBK
 FUNCTION   : Define the structures to represent a VSWITCH Stage I
              Routing Table and Routing Table Entry.
 LOCATED BY :
              LANRTBL L: ADR of first routing table entry
 CREATED BY :
              HCPSWAVT - Allocate VSWITCH Routing Table
 DELETED BY :
              HCPSWART - Release VSWITCH Routing Table
 REFERENCES : None
 SERIALIZED :
              LANLKWRD (LAN Lock)
 RELOCATION CONSIDERATIONS : None
 NOTES      : None
  SWITCH Stage I Routing Table
  X
 
 
  VRTBK Control Block Content Top of page
  




 VRTBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      VRTBK          VSWITCH Stage I Routing Table
0000    0 Signed       4 VRTEYE         Eye catcher "RTBL"
0004    4 Signed       4 VRTLANBK       L:LANBK Address
0008    8 Address      4 VRTNEXT        L:ADR of next page in table
000C   12 Address      4 VRTPREV        L:ADR of previous page in table
0010   16 Signed       4 VRTMAP         Allocation Map
      Stage I Routing Table Suspension Queue
0014   20 Signed       4 VRTSCNT        Count of L:NDMBKs suspended
0018   24 Dbl-Word     8 VRTSPRTS (0)   Next and previous pointers
0018   24 Address      4 VRTSFIRS       First or oldest L:NDMBK queued
                                        and SPIN lock for entry
001C   28 Address      4 VRTSLAST       Last or latest L:NDMBK queued
0020   32 Signed       4 VRTHICAP       High Capacity Time-Out Count
0024   36 Signed       4 VRTPOFF        New Stage I Entry Value to Set
0028   40 Bitstring    1 * (88)         Reserved for future IBM use
0080  128 Bitstring    1 VRTEND (0)     The end
          00000080       VRTSIZE        VRTBSZB*8 VSWITCH Routing Table
                                        Size
          00000080       VRTFIRST       VRTEND-VRTBK Offset 1st Routing
                                        Table in page
          00000ABC       VRTMMASK       PFX7FFFS Maximum allocation mask
      Routing Table Entry




 VRTBLE DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      VRTBLE         VSWITCH Stage I Routing Table
0000    0 Signed       4 VRTLOCK        SPIN Lock and Offset
0004    4 Signed       4 *              Reserved for future IBM use
0008    8 Dbl-Word     8 VRTCNTRS (0)   Load Balance Interval Counters
0008    8 Signed       4 VRTPFRME       Frame count previous interval
000C   12 Signed       4 VRTCFRME       Frame count current interval
0010   16 Bitstring    1 VRTBEND (0)    The end
          00000010       VRTBSZB        (VRTBEND-VRTBLE) Size in bytes
          00000002       VRTBSZ         (VRTBEND-VRTBLE+7)/8 Size in
                                        d-words
          00000004       VRTBS2OF       4 Shift value to create a port
                                        number to an offset into VRTBLE
                                        array
 
 
  VRTBK Storage Layout Top of page
  
          
*** VRTBK - VSWITCH Stage I Routing Table
*
*     +---------------------------+---------------------------+
*   0 |          VRTEYE           |         VRTLANBK          |
*     +---------------------------+---------------------------+
*   8 |         VRTNEXT           |         VRTPREV           |
*     +---------------------------+---------------------------+
*  10 |          VRTMAP           |         VRTSCNT           |
*     +---------------------------+---------------------------+
*  18 |         VRTSFIRS          |         VRTSLAST          |
*     +---------------------------+---------------------------+
*  20 |         VRTHICAP          |         VRTPOFF           |
*     +---------------------------+---------------------------+
*  28 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*
*** VRTBK - VSWITCH Stage I Routing Table
          
*** VRTBLE - VSWITCH Stage I Routing Table
*
*     +---------------------------+---------------------------+
*   0 |         VRTLOCK           |///////////////////////////|
*     +---------------------------+---------------------------+
*   8 |         VRTPFRME          |         VRTCFRME          |
*     +---------------------------+---------------------------+
*
*** VRTBLE - VSWITCH Stage I Routing Table
 
 
  VRTBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
VRTBEND        0010
VRTBSZ         0010 00000002
VRTBSZB        0010 00000010
VRTBS2OF       0010 00000004
VRTCFRME       000C
VRTCNTRS       0008
VRTEND         0080
VRTEYE         0000
VRTFIRST       0080 00000080
VRTHICAP       0020
VRTLANBK       0004
VRTLOCK        0000
VRTMAP         0010
VRTMMASK       0080 00000ABC
VRTNEXT        0008
VRTPFRME       0008
VRTPOFF        0024
VRTPREV        000C
VRTSCNT        0014
VRTSFIRS       0018
VRTSIZE        0080 00000080
VRTSLAST       001C
VRTSPRTS       0018
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:58:07 EDT.
Copyright IBM Corporation, 1990, 2022