[dpdk-users] qdisc errors on 20.11.1 & Azure

[Tyler Blair]

Hi,

I'm seeing what looks like benign errors from qdisc on testpmd & our DPDK app on Azure. I'm wondering if anyone knows of a way to 'fix' these?

EAL: Detected 8 lcore(s)
EAL: Detected 1 NUMA nodes
EAL: Detected static linkage of DPDK
EAL: Selected IOVA mode 'VA'
EAL: Probing VFIO support...
EAL: VFIO support initialized
EAL: Probe PCI driver: mlx5_pci (15b3:1016) device: 2a8d:00:02.0 (socket 0)
EAL: Probe PCI driver: mlx5_pci (15b3:1016) device: 5ed7:00:02.0 (socket 0)
net_vdev_netvsc: probably using routed NetVSC interface "eth1" (index 3)*
*
*tap_nl_dump_ext_ack(): Cannot delete qdisc with handle of zero**
*
*tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid**
*
*tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid**
*
*tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid**
*
*tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid**
*
*tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid**
*
*tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid**
*
*tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid**
*
*tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid*
[...]

It's not causing any issues that I can see, I'm just wondering if there's a cause for this in the environment that we can fix so we don't have benign errors showing up.

Reproduced by running testpmd with no arguments on Azure:

- OS: Ubuntu 20.04 5.4.0-1048-azure
- DPDK: 20.11.1 (LTS)
- Networking: Azure Accelerated Networking (netvsc)

OS setup is pretty minimal, nothing special other than DPDK is installed.

I don't recall these errors happening while on bare metal - only on Azure.

Thanks!

Regards,
Tyler