default or selected kernelversion does not have config value CONFIG_INFINIBAND_CXGB3_DEBUG.
Result is shown for kernelversion 6.7-rc3

Verbose debugging output

configname: CONFIG_INFINIBAND_CXGB3_DEBUG

Linux Kernel Configuration
└─>Device Drivers
└─>InfiniBand support
└─>Verbose debugging output
In linux kernel since version 2.6.21.1 (release Date: 2007-04-27)  
This option causes the Chelsio RDMA driver to produce copious
amounts of debug messages. Select this if you are developing
the driver or trying to diagnose a problem.