default or selected kernelversion does not have config value CONFIG_DRM_TDFX.
Result is shown for kernelversion 6.9.5

3dfx Banshee/Voodoo3+

modulename: tdfx.ko

configname: CONFIG_DRM_TDFX

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Enable legacy drivers (DANGEROUS)
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>3dfx Banshee/Voodoo3+
In linux kernel since version 2.6.12  
Choose this option if you have a 3dfx Banshee or Voodoo3 (or later),
graphics card. If M is selected, the module will be called tdfx.

source code: