[Bug 1772461] Re: chzdev behaviour change in bionic

[Andrew McLeod]

Also, after a reboot:

ubuntu at s4lp5:~$ lszdev --configure --info c003
DEVICE qeth 0.0.c003:0.0.c004:0.0.c005
  Names              : encc003
  Network interfaces : encc003
  Modules            : qeth
  Online             : yes
  Exists             : yes
  Persistent         : yes

  ATTRIBUTE                ACTIVE            PERSISTENT
  bridge_hostnotify        "0"               -
  bridge_reflect_promisc   "none"            -
  bridge_role              "none"            "primary"
  buffer_count             "64"              -
  hw_trap                  "disarm"          -
  isolation                "none"            -
  layer2                   "1"               "1"
  online                   "1"               "1"
  performance_stats        "0"               -
  portname                 ""                -
  portno                   "0"               -
  priority_queueing        "always queue 0"  -
  vnicc/bridge_invisible   "n/a"             -
  vnicc/flooding           "n/a"             -
  vnicc/learning           "n/a"             -
  vnicc/learning_timeout   "n/a"             -
  vnicc/mcast_flooding     "n/a"             -
  vnicc/rx_bcast           "n/a"             -
  vnicc/takeover_learning  "n/a"             -
  vnicc/takeover_setvmac   "n/a"             -


....

It appears that the error from the tool is just misleading, as I have
just found this in dmesg:

[   14.218702] qeth.8c5944: 0.0.c003: The LAN already has a primary
Bridge Port

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Title:
  chzdev behaviour change in bionic

Status in Ubuntu on IBM z Systems:
  New
Status in s390-tools package in Ubuntu:
  New

Bug description:
  This may be less of a bug, and more of a change of usage:

  Using preseeds for xenial I was successfully able to configure
  bridge_role=primary on a qeth device, using this command:

  chzdev --no-root-update -pVe ${NIC_ID} layer2=1 bridge_role=primary

  However, this no longer works - upon reboot, bridge_role is set to
  none.

  Running this command manually, on the built lpar, without --no-root-
  update, returns:

  QETH device 0.0.c003:0.0.c004:0.0.c005 already configured

  Running sudo chzdev -Ve 0.0.c003 layer2=1 bridge_role=primary

  returns

  Error: Cannot set layer2='1' while online='1' (*)

  Running with --force still complains about being online, so first i
  take the dev offline, and rerun the command, but get this:

  Error: Settings bridge_role and vnicc/rx_bcast are in conflict (*)

  ubuntu at s4lp5:/sys/devices/qeth/0.0.c003$ cat vnicc/rx_bcast 
  n/a
  ubuntu at s4lp5:/sys/devices/qeth/0.0.c003$

  The only combination that seems to work is:

  ubuntu at s4lp5:/sys/devices/qeth/0.0.c003$ sudo chzdev -Ve 0.0.c003 layer2=1 bridge_role=primary online=0 --force
  Scanning for devices in all configurations:
    ECKD DASD          : 268
  Loading required kernel module: dasd_fba_mod
  Failed to load kernel module: dasd_fba_mod
    FBA DASD           : 0
    FCP device         : 20
    zFCP LUN           : 0
    QETH device        : 42
  Loading required kernel module: ctcm
  Failed to load kernel module: ctcm
    CTC device         : 0
  Loading required kernel module: lcs
  Failed to load kernel module: lcs
    LCS device         : 0
    Generic CCW device : 1
    Total              : 331
  QETH device 0.0.c003:0.0.c004:0.0.c005 configured
      Changes: online=0 bridge_role=primary
      Network interface: encc003
      Warning: Settings bridge_role and vnicc/rx_bcast are in conflict

  ubuntu at s4lp5:/sys/devices/qeth/0.0.c003$ cat bridge_role
  primary
  ubuntu at s4lp5:/sys/devices/qeth/0.0.c003$ sudo chzdev -Ve 0.0.c003 online=1
  Scanning for devices in all configurations:
    ECKD DASD          : 268
  Loading required kernel module: dasd_fba_mod
  Failed to load kernel module: dasd_fba_mod
    FBA DASD           : 0
    FCP device         : 20
    zFCP LUN           : 0
    QETH device        : 42
  Loading required kernel module: ctcm
  Failed to load kernel module: ctcm
    CTC device         : 0
  Loading required kernel module: lcs
  Failed to load kernel module: lcs
    LCS device         : 0
    Generic CCW device : 1
    Total              : 331
  QETH device 0.0.c003:0.0.c004:0.0.c005 configured
      Changes: online=1
      Network interface: encc003
  ubuntu at s4lp5:/sys/devices/qeth/0.0.c003$ cat bridge_role
  none
  ubuntu at s4lp5:/sys/devices/qeth/0.0.c003$

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