Hi Aleksandr,
If you want to use TCP IP layer, please check documentation of LWIP stack.
https://www.nongnu.org/lwip/2_0_x/index.html
Notice that LWIP is open source software, so we provide only very limited support.
ENET_DRV... belongs to data link layer which is described in SDK user manual:
c:\NXP\S32DS.3.4\S32DS\software\S32SDK_S32K1XX_RTM_4.0.2\doc\S32SDK_S32K148_UserManual.pdf
Regards,
Lukas