The EFF launches a router project

"My understanding of DPDK and ODP is that they are mostly interested in running proprietary network stacks in user space, in order to implement features there that don't exist in the kernel, but at the same time completely bypassing the kernel and the features that exist in it. The fact that Intel and some others can do DMA into caches is independent of that and you can do that in both kernel and user space based network stacks."

Have a look at openfastpath on ODP.
Linux is still used as controlplane with --enable-sp, ARP, RIPv2 et.c. is sent to the kernel stack.
Standard cmds "arp", "ip" et.c. are used to configure parts of the stack thats common between both.
Control plane stack state is mirrored via netlink for fast access by packet churning cores, i.e. ARP table, FIB et.c.