nvme: read the subsystem NQN from Identify Controller
NVMe 1.2.1 or later requires controllers to provide a subsystem NQN in the Identify controller data structures. Use this NQN for the subsysnqn sysfs attribute by storing it in the nvme_ctrl structure after verifying it. For older controllers we generate a "fake" NQN per non-normative text in the NVMe 1.3 spec. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NKeith Busch <keith.busch@intel.com> Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NSagi Grimberg <sagi@grimberg.me> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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