Did you get a chance to take a look at converting PCIe over?
I started to play around with it, not anywhere near getting it in shape though...
A lot of the design decisions seem to be driven by allowing PCIe as well,
That's true.
and I'd like to see if that's possible / useful to start with.
From what my radar got, it seems feasible. If you look at the nvme-core routines, they really consists of the abstract part of the controller initiation. From what I've seen so far, PCIe will require some extra hooks on top of what we have now (some portion of nvme_pci_enable will probably need to be added as well, and we'll need some generic representation for pci device error states). I do expect nvme-core changes for PCIe, but I don't expect the teardown/initiation structure to change. The only real design choice taken to accommodate PCIe was to manage admin and io queues in the transports instead of nvme-core as queues release procedure is different in PCIe. I think its a very desirable goal to have PCIe consolidate with fabrics here, so I'd like to shoot for that and backoff later (and change again where makes sense). Having said that, I'm very much open to suggestions if you have anything better in mind...
