Re-implementing test-pmd, l3fwd, etc in Rust is OK but not huge leap.
DPDK examples and applications are part of inner infrastructure.
The patch allows external RUST application as well.
The real benefit would the ability to support PMD's built in Rust.
That would be much more invasive
It's not sure when and even if vendors decide to work on RUST PMD.
Before that happens, there must be native RUST API with RUST-DPDK library
functions.
In the meanwhile, RUST application can use existing C API.
Also, having RUST inside DPDK can shape existing API for future conversion.
