> Why link speed is undefined?
> Old kernel?
> Kernel mlx5 driver issue?
> Do you know?

Seems to be a bug in kernel mlx5 driver: 
http://mails.dpdk.org/archives/users/2020-March/004758.html
I still think this test is too strict, and from what I can see mlx4 PMD do not 
implement it (even if it uses 2 syscalls too).

ben

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