Current FC FCOE licensing model on N5K is honour based.which comes in increment of 8.
(N5K-8P-SSK9) 8 port FC license .
However future model is going restrict on port based lcienses.
After installing N5K-8P-SSK9 license file which is called storage protocol service license.
you would see
"show license usage" output show as
ENTERPRISE_PKG Yes - Unused Never -
FC_FEATURES_PKG Yes - Unused Never
N55xx-FNPV-SSK9 is only for FCoE NPV mode, not for FC NPV mode. If you'd like to run FC NPV mode you need the Storage Services License, this license also includes the FCoE NPV license.
http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/san_switching/503_n2_1/Cisco_n5k_nxos_sanswitching_config_guide_rel503_n2_1_chapter6.html#topic_5492D4043C0746BFBE94FE6E2EBF7397