nvmft: The in-kernel NVMe over Fabrics controller

[jhb]

Summary

This is the server (target in SCSI terms) for NVMe over Fabrics.
Userland is responsible for accepting a new queue pair and receiving
the initial Connect command before handing the queue pair off via an
ioctl to this CTL frontend.

This frontend exposes CTL LUNs as NVMe namespaces to remote hosts.
Users can ask LUNS to CTL that can be shared via either iSCSI or
NVMeoF.

Sponsored by: Chelsio Communications

[imp]

Nothing bad stood out, but the size of this makes it hard to review carefully.

sys/dev/nvmf/controller/ctl_frontend_nvmf.c

128

For NDA the LUN == NSID. Does the mismatch matter in this context?

[jhb]

This is indeed a large change, but it's not really feasible to split it up further. :(

sys/dev/nvmf/controller/ctl_frontend_nvmf.c

128

No. CTL LUNs start at 0, but NVMe namespaces start at 1, so I can't reuse CTL LUNs directly.

[jhb]

Switch to SPDX-only license blocks for C files