** Changed in: linux (Ubuntu Jammy)
Importance: Undecided => High
** Changed in: linux (Ubuntu Kinetic)
Importance: Undecided => High
** Changed in: linux (Ubuntu Jammy)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu Kinetic)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
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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
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