------- Comment From heinz-werner_se...@de.ibm.com 2018-03-06 10:02 EDT------- Not able to test this kernel, but this patch was verified upfront, before posting..
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1750810 Title: qeth: fix calculation of required buffer elements for skb Status in Ubuntu on IBM z Systems: In Progress Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: In Progress 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1750810/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
