No , As u say u have the network device driver code. U must look for a Abstraction Layer this code provides to the user-space programs to send and receive packets , call this in the ethernetif.c file and also include the driver code in the compile. What I mean is , the lwip and network device driver code should be compiled together. So compile lwip+ device driver as a module and insert in the device is one option.
this is just a suggestion. Regards
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