default or selected kernelversion does not have config value CONFIG_HFI1_VERBS_31BIT_PSN.
Result is shown for kernelversion 6.4.14
HFI1 enable 31 bit PSN
configname: CONFIG_HFI1_VERBS_31BIT_PSN
Linux Kernel Configuration
└─>Device Drivers
└─>InfiniBand support
└─>HFI1 enable 31 bit PSN
In linux kernel since version 4.1 (release Date: 2015-06-21)
Setting this enables 31 BIT PSN
For verbs RC/UC
For verbs RC/UC