Bug 1977850
| Summary: | geneve virtual devices lack the NETIF_F_FRAGLIST feature | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 8 | Reporter: | Paolo Abeni <pabeni> |
| Component: | kernel | Assignee: | Paolo Abeni <pabeni> |
| kernel sub component: | Tunnel | QA Contact: | Jianlin Shi <jishi> |
| Status: | CLOSED ERRATA | Docs Contact: | |
| Severity: | medium | ||
| Priority: | medium | CC: | brdeoliv, jiji, lxin, network-qe, rkhan |
| Version: | 8.5 | Keywords: | FutureFeature, Triaged |
| Target Milestone: | beta | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | kernel-4.18.0-322.el8 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2021-11-09 19:23:41 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
reproduced on 4.18.0-316:
[root@hpe-dl380pgen8-02-vm-16 ~]# ip link add geneve1 type geneve id 1234 remote 1.1.1.1
[root@hpe-dl380pgen8-02-vm-16 ~]# ethtool -k geneve1 | grep frag
tx-scatter-gather-fraglist: off [fixed]
[root@hpe-dl380pgen8-02-vm-16 ~]# uname -a
Linux hpe-dl380pgen8-02-vm-16.hpe2.lab.eng.bos.redhat.com 4.18.0-316.el8.x86_64 #1 SMP Mon Jun 21 15:32:48 EDT 2021 x86_64 x86_64 x86_64 GNU/Linux
Verified with kernel in comment 4:
[root@hpe-dl380pgen8-02-vm-16 ~]# uname -a
Linux hpe-dl380pgen8-02-vm-16.hpe2.lab.eng.bos.redhat.com 4.18.0-319.el8.mr892_210701_1056.x86_64 #1 SMP Thu Jul 1 11:09:06 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
[root@hpe-dl380pgen8-02-vm-16 ~]# ip link add geneve1 type geneve id 1234 remote 1.1.1.1
[root@hpe-dl380pgen8-02-vm-16 ~]# ethtool -k geneve1 | grep frag
tx-scatter-gather-fraglist: on
Verified on 4.18.0-322:
[root@kvm-02-guest09 ~]# uname -a
Linux kvm-02-guest09.rhts.eng.brq.redhat.com 4.18.0-322.el8.x86_64 #1 SMP Wed Jul 7 22:22:31 EDT 2021 x86_64 x86_64 x86_64 GNU/Linux
[root@kvm-02-guest09 ~]# ip link add geneve1 type geneve id 1234 remote 1.1.1.1
[root@kvm-02-guest09 ~]# ethtool -k geneve1 | grep frag
tx-scatter-gather-fraglist: on
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Moderate: kernel security, bug fix, and enhancement update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2021:4356 |
The mentioned device feature is not exposed by the geneve devices: ethtool -k <geneve device name>|grep frag tx-scatter-gather-fraglist: off [fixed] that leads to unneeded segmentation for GSO traffic traversing such device, impacting especially layered products like OSP. Fixed by the upstream commit: commit 18423e1a9d7d72c84f04e7f5fa31070855966ea7 Author: Xin Long <lucien.xin> Date: Fri Jan 15 17:47:46 2021 +0800 geneve: add NETIF_F_FRAGLIST flag for dev features With the above commit applied the expected result is: ethtool -k <geneve device name>|grep frag tx-scatter-gather-fraglist: on