[dpdk-users] Mellanox CX-5 failed with DPDK 20.05, but ok with DPDK 19.11.3

[David Christensen]

> Dear DPDK Users,
> 
> I met a problem with DPDK 20.05 + Mellanox CX-5 NIC. Does anyone know how to fix it? Thanks a lot!
> 
> Problem:
> Mellanox CX-5 card ok with DPDK 19.11.3 but failed with DPDK 20.05.
> 20.05 Reports no ethernet device, ok with 19.11.3

The Mellanox CX-5 poll mode driver (PMD) is not built by default in some 
configurations.  When using meson to build the framework the mlx5 
dependencies are usually detected automatically and the PMD is built 
correctly.  On the other hand, if you're building with GNU make then the 
MLX5 PMD needs to be specifically enabled by modifying a configuration 
file.  Refer to the MLX5 PMD documentation for more details:

https://doc.dpdk.org/guides/nics/mlx5.html

Dave