[Bug]: "netlink error: Invalid argument" when changing combined queue count

[Jalle19]

Preliminary Actions

• I have searched the existing issues and didn't find a duplicate.
• I have followed the AWS official troubleshoot documentation.
• I have followed the driver readme and best practices.

Driver Type

Linux kernel driver for Elastic Network Adapter (ENA)

Driver Tag/Commit

2.16.0g

Custom Code

No

OS Platform and Distribution

Rocky Linux 10 (both ARM64 and x86_64 affected)

Bug description

When you try to change the combined queues for an interface using ethtool -L eth1 combined 1, ethtool exits with 1 and prints netlink error: Invalid argument. This did not happen on version 2.15.0g.

When run a second time, there is no error, because the value has actually been changed, as verified by running ethtool -l eth1.

Reproduction steps

# ethtool -L eth1 combined 1
netlink error: Invalid argument

Expected Behavior

No error

Actual Behavior

netlink error: Invalid argument

Additional Data

Relevant log output

Contact Details

No response

[davidarinzon]

Hi @Jalle19

Thanks for raising the issue.

I tried re-creating the scenario on Rocky Linux 10 (6.12.0-124.8.1.el10_1.aarch64), RHEL 10 (6.12.0-124.13.1.el10_1.aarch64) and AL2023 6.12 (6.12.55-74.119.amzn2023.aarch64) and I didn't observe any error.
I will note that by default, in all three OSs, my interface name was ens5 and not eth1 (unless some tools/scripts happened to modify it).

Can you share more info? Configuration, state of the interface when running the command (UP/DOWN) number of interfaces (eth1 indicates more than one interface I assume), AMI ID, kernel version, etc. dmesg logs would also be useful.

[Jalle19]

The setup is the same as described in #354, except with Rocky Linux 10 and the latest ENA driver. I'll do some testing to see if I can narrow down the issue.

[davidarinzon]

Hi @Jalle19

Were you able to get more information about this in order to help with re-creation?

[Jalle19]

Not yet, hasn't been prioritized so far. I'll see after the holidays if I have time to pick this up.