How to get MTU of an dpdk interface?

I'm built an async high level network stack that supports websocket based on capsule(customized, runtime independent)/rawsocket and smoltcp.
Currently the mtu of rawsocket is fetched by pnet, mtu of dpdk device is hard coded. I would like to play around jumbo frames with multiple interfaces at the same time.
This requires getting MTU of a dpdk interface.
How to get MTU of an dpdk interface?

I can use `ip a` to get `ena` devices' MTU, but not `igb_uio`.

Start by tracing the existing pnet-based MTU path for rawsocket and the DPDK device handling in the async network stack, including its smoltcp integration. Compare MTU behavior for ena and igb_uio devices and identify what interface information is available; done means establishing a supported way to obtain a DPDK interface MTU for multi-interface jumbo-frame use.

Written by the indexing model from the issue text.