I don't know the details of the hardware interface of NVMe (not ssd, the real NVMe), but how setting up hardware scatter and gater lists for DMA will end up sig

I don't know the details of the hardware interface of NVMe (not ssd, the real NVMe), but how setting up hardware scatter and gater lists for DMA will end up significantly faster, I cannot see any pertinent meaning. And, is this code compiling with the rust compiler written in rust? (namely not pulling in the SDK this horrible c++ diareha which is gcc). I have not checked rust syntax lately, but hopefully, it did not become insane like the c++ one (and what they are trying hard to do with C). Even at the start, I really did not like the hardcoding of strings directly into the syntax, but at least it had the decency to not require a garbage collector.