default or selected kernelversion does not have config value CONFIG_OCTEONEP_VDPA.
Result is shown for kernelversion 6.11-rc7

vDPA driver for Octeon DPU devices

modulename: octep_vdpa.ko

configname: CONFIG_OCTEONEP_VDPA

Linux Kernel Configuration
└─>Device Drivers
└─>vDPA drivers
└─>vDPA driver for Octeon DPU devices
This is a vDPA driver designed for Marvell's Octeon DPU devices.
This driver enables the offloading of the VirtIO dataplane to an
Octeon DPU device.
Please note that this driver must be built as a module and it
cannot be loaded until the Octeon emulation software is running.

source code:
depends
CONFIG_MODULES
CONFIG_PCI_MSI
CONFIG_VDPA