Submitted Xenial SRU request:
https://lists.ubuntu.com/archives/kernel-team/2018-March/090640.html

** Description changed:

+ == SRU Justification ==
+ 
  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.
+               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.
+               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.
+               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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https://bugs.launchpad.net/bugs/1750810

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

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