** Also affects: ubuntu-z-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-z-systems
   Importance: Undecided => High

** Changed in: ubuntu-z-systems
     Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

** Changed in: ubuntu-z-systems
       Status: New => Triaged

** Tags added: kernel-da-key

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https://bugs.launchpad.net/bugs/1750810

Title:
  qeth: fix calculation of required buffer elements for skb

Status in Ubuntu on IBM z Systems:
  Triaged
Status in linux package in Ubuntu:
  New

Bug description:
  Description:  qeth: fix calculation of required buffer elements for
  skb

  Symptom:      Repeated device recovery due to Subchannel Program
  Checks

  Problem:      skbs of certain lengths cause qeth to miscalculate the
                number of needed IO buffer elements, resulting in
                malformed TX buffer descriptors. When such a buffer is
                presented to the HW, it triggers a Subchannel Program
                Check. qeth handles this by starting device recovery.

  Solution:     Fix the buffer element calculation, so that qeth builds
                proper TX buffer descriptors.

  Reproduction: Occurs for skbs where the last byte of the linear data
                range / of a page frag sits on a page boundary.

  Upstream Git Commit:
  89271c65edd599207dd982007900506283c90ae3
  kernel 4.16


  backported to xenial/master-next

  Here's a backport of the upstream commit for pre-4.8 kernels.

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