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** Tags added: verification-needed-eoan

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https://bugs.launchpad.net/bugs/1860523

Title:
  Fix misleading error message: Configuring the VNIC characteristics
  failed

Status in Ubuntu on IBM z Systems:
  In Progress
Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Eoan:
  Fix Committed
Status in linux source package in Focal:
  Triaged

Bug description:
  SRU Justification:
  ------------------

  [Impact]

  * For devices that don't support the 'INVISIBLE' characteristic (ie.
  OSA), the resulting IO failure raises the noisy error message
  "Configuring the VNIC characteristics failed"

  * The INVISIBLE characteristic unconditionally gets switched off,
  which is reverted with this patch.

  * For Internal Queued Direct communication (IQD) 'INVISIBLE' is off by
  default.

  * Hence the INVISIBLE characteristic case is unnecessary.

  [Fix]

  * 68c57bfd52836e31bff33e5e1fc64029749d2c35 68c57bf "s390/qeth: fix
  false reporting of VNIC CHAR config failure"

  * Upstream accepted with v5.5-rc5, but backport for 4.19-stable and
  5.4-stable here:
  https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-
  queue.git

  [Test Case]

  * Configure an IBM z15 for LinuxONE III machine with at least one OSA
  adapter.

  * Check dmsg for message "Configuring the VNIC characteristics failed"
  while setting an OSA device online.

  [Regression Potential]

  * The regression potential is low, since the patch is limited to a
  single line

  * again limited to the s390x architecture and once again limited to
  the qeth network driver

  * and on z15 hardware only.

  [Other Info]

  * This bug was identified at IBM while testing and is now rolled out
  to several different kernels.

  * Once the patch got applied to the Ubuntu kernel(s) and a
  verification is required,

  * this needs to be done by IBM, since Canonical doesn't have the
  needed machine generation.

  __________

  The patch titled s390/qeth: fix false reporting of VNIC CHAR config failure
  has been added to the 4.19-stable tree which can be found at: 
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

  The filename of the patch is: s390-qeth-fix-false-reporting-of-vnic-
  char-config-failure.patch and it can be found in the queue-4.19
  subdirectory.

  Same for the the 5.4-stable tree which can be found at:
  http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-
  queue.git;a=summary

  The filename of the patch is: s390-qeth-fix-vnicc_is_in_use-if-
  rx_bcast-not-set.patch and it can be found in the queue-5.4
  subdirectory.

  s390/qeth: fix false reporting of VNIC CHAR config failure
  commit 68c57bfd52836e31bff33e5e1fc64029749d2c35 upstream.

  Request: Please provide that fix also for Ubuntu 18.04 .

  Many thanks in advance

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