mlx4_en  flow control

Hello

release 2.2-1 for red hat driver shows support for 802.1Qbb priority based flow control. Is the default LLFC or port based? Which flow control is enabled by default? I have tried making changes to the /etc/modprobe.d/mlx4.conf to set PFC flow control.

My entry:

options mlx4_en pfctx=3 pfcrx=3

Will this work?