default or selected kernelversion does not have config value CONFIG_IBM_NEW_EMAC_RXB.
Result is shown for kernelversion 6.2.5
Number of receive buffers
configname: CONFIG_IBM_NEW_EMAC_RXB
Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet (10 or 100Mbit)
└─>Number of receive buffers