Hi Patrick,
what Interconnect modules are used in the c7000 Enclosure and what is the firmware of the modules? What is the FOS on the Brocade B300 SAN Switches? Do you see the FC ports from the Enclosure logging into a F-Port (with or without NPIV) on the switch?
This should be the right driver and readme for the CNA and RHEL 7.2.
HPE QLogic NX2 1/10/20 GbE Multifunction Drivers for Red Hat Enterprise Linux 7 x86_64
http://h20565.www2.hpe.com/hpsc/swd/public/detail?swItemId=MTX_a0a5853c691e471ab4c66c9d5b
Please use the Accept Solution button next to my post and assign a KUDO (thumbs up icon) if this works for you.
Regards,
Sebastian Koehler