Yepp, it's all about kernel patches. This bug was wrongly marked as affecting the ethtool (well, it affects the ethtool, but not in the 'affects' send of Launchpad), which caused some confusion. I just changed that, pointing now to the kernel (which is "linux (Ubuntu)" in the above affects section).
-- 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/1984103 Title: [UBUNTU 22.04] s390/qeth: cache link_info for ethtool Status in Ubuntu on IBM z Systems: Confirmed Status in linux package in Ubuntu: Confirmed Status in linux source package in Jammy: Confirmed Status in linux source package in Kinetic: Confirmed Bug description: == Comment: #0 - J?rn Siglen <sig...@de.ibm.com> - 2022-08-09 07:38:27 == +++ This bug was initially created as a clone of Bug #199319 +++ Description: s390/qeth: cache link_info for ethtool Symptom: lost of IP connection and log entries in journalctl: kernel: qeth 0.0.0365: The qeth device driver failed to recover an error on the device Problem: Since commit e6e771b3d897 ("s390/qeth: detach netdevice while card is offline") there was a timing window during recovery, that qeth_query_card_info could be sent to the card, even before it was ready for it, leading to a failing card recovery. There is evidence that this window was hit, as not all callers of get_link_ksettings() check for netif_device_present. Solution: Use cached values in qeth_get_link_ksettings(), instead of calling qeth_query_card_info() and falling back to default values in case it fails. Link info is already updated when the card goes online, e.g. after STARTLAN (physical link up). Set the link info to default values, when the card goes offline or at STOPLAN (physical link down). A follow-on patch will improve values reported for link down. Fixes: e6e771b3d897 ("s390/qeth: detach netdevice while card is offline") Reproduction: enforce a eth device recvoery, while running ethtool multiple times in parallel and using iperf to get load on the interface. Upstream-ID: 7a07a29e4f6713b224f3bcde5f835e777301bdb8 https://lore.kernel.org/all/20220805184504.7f6f2...@kernel.org/T/#m2e3799a38d1d4630822db50f9a5d9b2ca018252f applicable for most kernel > 3.14 == Comment: #3 - J?rn Siglen <sig...@de.ibm.com> - 2022-08-09 07:54:41 == the inital update came in with kernel 5.1 upstream, but we found it backported in many older kernel versions == Comment: #4 - J?rn Siglen <sig...@de.ibm.com> - 2022-08-09 08:03:09 == the acceptance info of the patch can be found here: https://lore.kernel.org/all/20220805184504.7f6f2...@kernel.org/T/#m2e3799a38d1d4630822db50f9a5d9b2ca018252f To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1984103/+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
