VM66302: VIRTUAL SWITCH CORRECTIVE SERVICE AND ENHANCEMENTS

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• Enhancements are made to add internal Destination MAC Address
  caching across multiple data transfers.  In addition, both
  inbound and outbound I/O Interruption processing is streamlined
  to reduce the number of interruptions required to support a high
  bandwith network data transfer.  Also, corrected errors in
  DETACH VSWITCH and IVL VSwitch & Takeover processing.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of z/VM Virtual Switch (VSWITCH).  *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  Internal testing revealed base areas where improvements could be
  made as well as prevent z/VM ABENDs from occurring for rare
  timing situations.
  
  - Moved from a local MAC Address cache to a persistent cache
    spanning multiple data transfers to the same destination, and
    reducing the amount of time to resolve the destination port
    for a data transfer.
  
  - Reduced the number of Adapter Interrupts presented to the
    guest for an incoming data transfer.
  
  - Fixed an HTT001 ABEND that may occur when detaching a VSwitch
    with a port group (LAG) that had outstanding LACP Marker tasks
    in flight.
  
  - Fixed an HTT001 ABEND that occurred when performing failover
    testing for a global VSwitch with a shared LAG when IVL
    Takeover logic was processing.
  

Problem conclusion

Temporary fix

Comments

• The code has been updated to address the items listed in the
  problem summary.
  ×**** PE20/06/19 FIX IN ERROR. SEE APAR VM66406  FOR DESCRIPTION
  ×**** AE21/02/17 FIX IN ERROR. SEE APAR VM66502  FOR DESCRIPTION
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UM35537

Modules/Macros

• HCPARP   HCPCBI   HCPDGQ   HCPECBBK HCPIQE   HCPIQQ   HCPIQR
  HCPLAN   HCPLANBK HCPMFN   HCPNICBK HCPNID   HCPNIDBK HCPQDIO
  HCPSWA   HCPVAI   HCPVAP   HCPVLC   HCPVLF   HCPVLU   HCPVNS
  HCPVQA   HCPVQT
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R710 PSY UM35537

     UP19/09/30 P 2001

Fix is available

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