mlx5en & tcpdump -Q

Related to the other issue just mentioned, I found that when trying to 
perform unidirectional packet captures using the tcpdump -Q option, when 
trying this against a CX5 NIC, i get this error message:

tcpdump: e4a: pcap_setdirection() failed: Setting direction is not 
implemented on this platform

(this is a 13.0 kernel, can not really check main).

Does anyone know if this functionality is available already, or any 
plans to implement this for mlx5en ?

Thanks,
   Richard