IV95372: VLAN TAGGED LARGESEND PACKETS ARE DROPPED FOR SOME ADAPTERS

APAR status

• Closed as program error.

Error description

• **************************************************************
  * USERS AFFECTED:
  * Systems running the AIX 6100-09 Technology Level
  * or VIOS 2.2.3.90 or VIOS 2.2.4.40 or VIOS 2.2.5.20
  * with devices.ethernet.lnc.rte at the 6.1.9.201 level.
  **************************************************************
  * ERROR DESCRIPTION:
  * In the latest SPs, for certain adapters, VLAN tagged
  * largesend packets are silently dropped in the AIX/VIOS
  * adapter layer.
  *
  * On all AIX and VIOS levels mentioned above, adapters using
  * the lncentdd driver are exposed.
  * On 7100-03-09, adapters using the mlxentdd driver are also
  * exposed.
  *
  * Find out if a system has any adapters using an affected
  * driver with lsdev, for example:
  * # lsdev -F "name ddins" | grep lncentdd
  * Note: on a VIOS, this must be run as root using
  * 'oem_setup_env'.
  **************************************************************
  * RECOMMENDATION:
  * Install APAR IV95372.
  * Prior to fix availability, an interim fix is available from
  * either
  * ftp://aix.software.ibm.com/aix/ifixes/iv95372/
  * https://aix.software.ibm.com/aix/ifixes/iv95372/
  * Installation of the ifix requires a reboot.
  **************************************************************
  

Local fix

• Disable largesend on the physical adapter:
  chdev -a large_send=no -l entX
  

Problem summary

• The driver incorrectly calculates the packet header size for
  VLAN tagged
  largesend packets and therefore the packets are silently dropped
  

Problem conclusion

• Correct the code to properly handle VLAN tagged largesend
  packets
  

Temporary fix

•   *********
    * HIPER *
    *********
  

Comments

APAR Information

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

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

  IV95517 IV95637 IV95638

Fix information

• Fixed component name

  VIRTUAL I/O SER

• Fixed component ID

  5765G3400

Applicable component levels