Kenneth D. Merry
ba75cf0572
The NVMe reservation model is closely patterned after SCSI Persistent Reservations, so support NVMe devices through the existing persist subcommand rather than adding a transport-specific subcommand. The persist subcommand now dispatches on the device protocol, in the same way the identify subcommand does. The SCSI syntax is unchanged. For NVMe devices, the -i modes all map to the Reservation Report command (read_full_status requests the extended data structure, which contains 128-bit Host Identifiers), and the -o service actions map to the corresponding NVMe reservation operations: register, register_ignore, reserve, preempt, preempt_abort, release and clear, plus two NVMe-only actions, unregister and replace. The reservation type names for -T are shared between SCSI and NVMe. A new -c option gives explicit control over the NVMe Persist Through Power Loss State; -p is equivalent to -c enable. SCSI-only options return an error for NVMe devices. Tested against a PASCARI X200 series SSD (reservation capabilities: WR_EX, PTPL, IEKEY13): register, reserve, release, replace, unregister, -c enable/disable (Persist Through Power Loss State change verified in the report output), reservation report, and the error paths. register_ignore is rejected by drives that implement NVMe 1.3 IEKEY semantics, as expected. SCSI persist against a da(4) device is unchanged. sbin/camcontrol/nvres.c: New file, the NVMe reservation backend for the persist subcommand. sbin/camcontrol/camcontrol.c: Dispatch the persist subcommand to scsipersist() or nvmepersist() based on the device protocol. sbin/camcontrol/camcontrol.h: Add the nvmepersist() prototype. sbin/camcontrol/Makefile: Add nvres.c to the build. sbin/camcontrol/camcontrol.8: Document NVMe support in the persist subcommand section, and note the differences from SCSI where they occur. Co-authored-by: Reid Linnemann <[email protected]> Co-authored-by: Claude Fable 5 <[email protected]> Reviewed by: imp MFC after: 1 week Sponsored by: Spectra Logic Differential Revision: https://reviews.freebsd.org/D59534
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