[ovs-discuss] ovs-vswitchd: dpif_netlink |ERR|failed to offload flow: Numerical result out of range

Koukal Petr p.koukal at radiokomunikace.cz
Thu Nov 21 13:55:08 UTC 2019


Hello,

We use a Mellanox ConnectX-5 card with Mellanox ASAP2 features. We use bond interface here.

When creating a new VM, there are constant errors in /openvswitch/ovs-vswitchd.log.

2019-11-11T15:54:46.937Z|00108|connmgr|INFO|br-int<->tcp:127.0.0.1:6633: 16 flow_mods in the 4 s starting 10 s ago (12 adds, 4 deletes)
2019-11-11T16:03:53.798Z|00001|dpif_netlink(handler7)|ERR|failed to offload flow: Numerical result out of range: eth51
2019-11-11T16:03:53.810Z|00002|dpif_netlink(handler7)|ERR|failed to offload flow: Numerical result out of range: eth51
2019-11-11T16:03:54.154Z|00003|dpif_netlink(handler7)|ERR|failed to offload flow: Numerical result out of range: eth51
2019-11-11T16:03:55.178Z|00004|dpif_netlink(handler7)|ERR|failed to offload flow: Numerical result out of range: eth51


root at dev-node1<https://mail.openvswitch.org/mailman/listinfo/ovs-discuss>:/usr/share/doc# service ovs-vswitchd status
* ovs-vswitchd.service - Open vSwitch Forwarding Unit
   Loaded: loaded (/lib/systemd/system/ovs-vswitchd.service; static; vendor preset: enabled)
   Active: active (running) since Mon 2019-11-11 16:28:43 CET; 36min ago
  Process: 26869 ExecStop=/usr/share/openvswitch/scripts/ovs-ctl --no-ovsdb-server stop (code=exited, status=0/SUCCESS)
  Process: 26993 ExecStart=/usr/share/openvswitch/scripts/ovs-ctl --no-ovsdb-server --no-monitor --system-id=random start $OPTIONS (code=exited,
 Main PID: 27037 (ovs-vswitchd)
    Tasks: 4 (limit: 4915)
   CGroup: /system.slice/ovs-vswitchd.service
           `-27037 ovs-vswitchd unix:/var/run/openvswitch/db.sock -vconsole:emer -vsyslog:err -vfile:info --mlockall --no-chdir --log-file=/var/l

Nov 11 16:28:43 dev-node1 ovs-vsctl[27057]: ovs|00001|vsctl|INFO|Called as ovs-vsctl --no-wait set Open_vSwitch . external-ids:hostname=dev-node1
Nov 11 16:28:43 dev-node1 ovs-ctl[26993]:  * Enabling remote OVSDB managers
Nov 11 16:28:43 dev-node1 systemd[1]: Started Open vSwitch Forwarding Unit.
Nov 11 17:03:53 dev-node1 ovs-vswitchd[27037]: ovs|00001|dpif_netlink(handler7)|ERR|failed to offload flow: Numerical result out of range: eth51
Nov 11 17:03:53 dev-node1 ovs-vswitchd[27037]: ovs|00002|dpif_netlink(handler7)|ERR|failed to offload flow: Numerical result out of range: eth51
Nov 11 17:03:54 dev-node1 ovs-vswitchd[27037]: ovs|00003|dpif_netlink(handler7)|ERR|failed to offload flow: Numerical result out of range: eth51


After restarting the OVS, this does not always occur immediately when the VM is created.
The problem starts after a few successfully created VMs. Then it happens every time.
Ovs-vswitchd does not crash, but the error is still there.


We have hw-offload turned on
root at dev-node1<https://mail.openvswitch.org/mailman/listinfo/ovs-discuss>: ~ # ovs-vsctl get Open_vSwitch. other-config
{hw-offload = "true"}

With hw-offload disabled, creating new instances is no problem.


We use 18.04.1-Ubuntu.
We have installed inux-generic-hwe-18.04-edge kernel as recommended.

apt list --installed | grep linux-image
linux-image-generic-hwe-18.04-edge/bionic,now 4.18.0.16.65 amd64 [installed]

cat /proc/version
Linux version 4.18.0-16-generic (buildd at lcy01-amd64-006) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #17~18.04.1-Ubuntu

hwe-support-status - verbose
Your Hardware Enablement Stack (HWE) is supported until April 2023



ovs-vswitchd --version
ovs-vswitchd (Open vSwitch) 2.12.0

We've installed these packages
openvswitch-common / now 2.12.0-0ubuntu1 ~ amd64 [installed, local]
openvswitch-dbg / now 2.12.0-0ubuntu1 ~ amd64 [installed, local]
openvswitch-switch / now 2.12.0-0ubuntu1 ~ amd64 [installed, local]
python3-openvswitch / now 2.12.0-0ubuntu1 ~ cloud0 all



Thank you for your help.

Petr Koukal

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