What:		/config/nvmet/ports/N/addr_adrfam
What:		/config/nvmet/ports/N/addr_portid
What:		/config/nvmet/ports/N/addr_traddr
What:		/config/nvmet/ports/N/addr_trsvcid
What:		/config/nvmet/ports/N/addr_trtype
What:		/config/nvmet/ports/N/addr_treq
Date:		June 2016
KernelVersion:	4.8
Contact:	Christoph Hellwig <hch@lst.de>
Description:
		Address attributes for an NVMe-oF target port.

		addr_adrfam: Shows or sets the address family. Accepted
		values: "pcie", "ipv4", "ipv6", "ib", "fc", "pci", "loop".

		addr_portid: Shows or sets the port identifier (u16).

		addr_traddr: Shows or sets the transport address string.

		addr_trsvcid: Shows or sets the transport service identifier.

		addr_trtype: Shows or sets the transport type. Accepted
		values: "rdma", "fc", "tcp", "pci", "loop". Also
		initializes default TSAS values.

		addr_treq: Shows or sets the transport security requirements.
		Accepted values: "not specified", "required",
		"not required". For TCP with TLS1.3, "not specified" is
		rejected.

		All attributes require the port to be disabled before
		modification.

What:		/config/nvmet/ports/N/referrals/NAME/addr_adrfam
What:		/config/nvmet/ports/N/referrals/NAME/addr_portid
What:		/config/nvmet/ports/N/referrals/NAME/addr_traddr
What:		/config/nvmet/ports/N/referrals/NAME/addr_trsvcid
What:		/config/nvmet/ports/N/referrals/NAME/addr_trtype
What:		/config/nvmet/ports/N/referrals/NAME/addr_treq
What:		/config/nvmet/ports/N/referrals/NAME/enable
Date:		June 2016
KernelVersion:	4.8
Contact:	Christoph Hellwig <hch@lst.de>
Description:
		Address attributes and enable control for a referral entry
		under a port. The addr_* attributes have the same semantics
		as the corresponding port-level attributes. The enable
		attribute shows or sets whether this referral is enabled
		(boolean).

What:		/config/nvmet/ports/N/param_inline_data_size
Date:		June 2018
KernelVersion:	4.19
Contact:	Steve Wise <swise@opengridcomputing.com>
Description:
		Shows or sets the inline data size for this port. Default
		is -1 which lets the transport choose. The port must be
		disabled before modification.

What:		/config/nvmet/ports/N/ana_groups/ID/ana_state
Date:		June 2018
KernelVersion:	4.19
Contact:	Christoph Hellwig <hch@lst.de>
Description:
		Shows or sets the ANA (Asymmetric Namespace Access) state
		for this group on this port. Accepted values: "optimized",
		"non-optimized", "inaccessible", "persistent-loss",
		"change". Changes trigger an ANA change event.

What:		/config/nvmet/ports/N/param_pi_enable
Date:		May 2020
KernelVersion:	5.8
Contact:	Israel Rukshin <israelr@mellanox.com>
Description:
		Shows or sets whether protection information (PI) is
		enabled/supported for this port. Accepts boolean value.
		Only available when CONFIG_BLK_DEV_INTEGRITY is enabled.
		The port must be disabled before modification.

What:		/config/nvmet/ports/N/addr_tsas
Date:		August 2023
KernelVersion:	6.7
Contact:	Hannes Reinecke <hare@suse.de>
Description:
		Shows or sets the transport-specific address subtype. For
		TCP transport, accepted values: "none", "tls1.3" (requires
		CONFIG_NVME_TARGET_TCP_TLS). For RDMA transport, shows the
		QP type: "connected" or "datagram". The port must be
		disabled before modification.

What:		/config/nvmet/ports/N/param_max_queue_size
Date:		January 2024
KernelVersion:	6.9
Contact:	Max Gurtovoy <mgurtovoy@nvidia.com>
Description:
		Shows or sets the maximum queue size for this port. Default
		is -1 which lets the transport choose. The port must be
		disabled before modification.

What:		/config/nvmet/ports/N/param_mdts
Date:		April 2026
KernelVersion:	7.1
Contact:	Aurelien Aptel <aaptel@nvidia.com>
Description:
		Shows or sets the maximum data transfer size for this port.
		Default is -1 which lets the transport choose. The port
		must be disabled before modification.

What:		/config/nvmet/subsystems/NAME/attr_allow_any_host
Date:		June 2016
KernelVersion:	4.8
Contact:	Christoph Hellwig <hch@lst.de>
Description:
		Shows or sets whether any host is allowed to connect.
		Accepts boolean value. Cannot be set to 1 if explicit
		hosts are linked in the allowed_hosts/ directory.

What:		/config/nvmet/subsystems/NAME/namespaces/NSID/device_path
What:		/config/nvmet/subsystems/NAME/namespaces/NSID/device_nguid
What:		/config/nvmet/subsystems/NAME/namespaces/NSID/enable
Date:		June 2016
KernelVersion:	4.8
Contact:	Christoph Hellwig <hch@lst.de>
Description:
		Namespace attributes added with the initial NVMe target.

		device_path: Shows or sets the backend block device path.
		The namespace must be disabled before modification.

		device_nguid: Shows or sets the NGUID (128-bit identifier).
		Accepts 32 hex digits with optional "-" or ":" separators.
		The namespace must be disabled before modification.

		enable: Shows or sets whether this namespace is enabled
		(boolean).

What:		/config/nvmet/subsystems/NAME/namespaces/NSID/device_uuid
Date:		June 2017
KernelVersion:	4.13
Contact:	Johannes Thumshirn <jthumshirn@suse.de>
Description:
		Shows or sets the UUID for this namespace. The namespace
		must be disabled before modification.

What:		/config/nvmet/subsystems/NAME/attr_version
What:		/config/nvmet/subsystems/NAME/attr_serial
Date:		July 2017
KernelVersion:	4.13
Contact:	Johannes Thumshirn <jthumshirn@suse.de>
Description:
		attr_version: Shows or sets the NVMe version reported by
		this subsystem. Format: "major.minor" or
		"major.minor.tertiary". Cannot be changed after the
		subsystem has been discovered.

		attr_serial: Shows or sets the serial number. Must be a
		1-20 byte ASCII string (characters 0x20-0x7e). Cannot be
		changed after the subsystem has been discovered.

What:		/config/nvmet/subsystems/NAME/namespaces/NSID/ana_grpid
Date:		June 2018
KernelVersion:	4.19
Contact:	Christoph Hellwig <hch@lst.de>
Description:
		Shows or sets the ANA (Asymmetric Namespace Access) Group
		ID for this namespace. Must be between 1 and 128. Changing
		triggers an ANA event notification.

What:		/config/nvmet/subsystems/NAME/namespaces/NSID/buffered_io
Date:		June 2018
KernelVersion:	4.19
Contact:	Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Description:
		Shows or sets whether buffered I/O is used for this
		namespace. Accepts boolean value. The namespace must be
		disabled before modification.

What:		/config/nvmet/subsystems/NAME/namespaces/NSID/p2pmem
Date:		October 2018
KernelVersion:	4.20
Contact:	Logan Gunthorpe <logang@deltatee.com>
Description:
		Shows or sets the P2P DMA memory device for this namespace.
		Accepts a PCI device BDF, "auto", or "none". The namespace
		must be disabled before modification. Only available when
		CONFIG_PCI_P2PDMA is enabled.

What:		/config/nvmet/subsystems/NAME/attr_cntlid_min
What:		/config/nvmet/subsystems/NAME/attr_cntlid_max
Date:		January 2020
KernelVersion:	5.7
Contact:	Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Description:
		attr_cntlid_min: Shows or sets the minimum controller ID
		(u16). Must be nonzero and not greater than attr_cntlid_max.

		attr_cntlid_max: Shows or sets the maximum controller ID
		(u16). Must be nonzero and not less than attr_cntlid_min.

What:		/config/nvmet/subsystems/NAME/attr_model
Date:		January 2020
KernelVersion:	5.7
Contact:	Mark Ruijter <MRuijter@onestopsystems.com>
Description:
		Shows or sets the model number for this subsystem. Must
		be a 1-40 byte ASCII string (characters 0x20-0x7e).
		Cannot be changed after the subsystem has been discovered.

What:		/config/nvmet/subsystems/NAME/attr_pi_enable
Date:		May 2020
KernelVersion:	5.8
Contact:	Israel Rukshin <israelr@mellanox.com>
Description:
		Shows or sets whether protection information (PI) is
		enabled/supported for this subsystem. Accepts boolean
		value. Only available when CONFIG_BLK_DEV_INTEGRITY is
		enabled.

What:		/config/nvmet/subsystems/NAME/namespaces/NSID/revalidate_size
Date:		May 2020
KernelVersion:	5.8
Contact:	Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Description:
		Write-only. Writing 1 triggers namespace size revalidation.
		If the size has changed, a namespace changed AEN is sent.
		The namespace must be enabled.

What:		/config/nvmet/subsystems/NAME/passthru/device_path
What:		/config/nvmet/subsystems/NAME/passthru/enable
Date:		July 2020
KernelVersion:	5.9
Contact:	Logan Gunthorpe <logang@deltatee.com>
Description:
		Passthrough mode attributes.

		device_path: Shows or sets the NVMe controller character
		device path (e.g., /dev/nvme0). Cannot be changed while
		the passthrough controller is active.

		enable: Shows or sets whether passthrough mode is enabled
		(boolean).

		Only available when CONFIG_NVME_TARGET_PASSTHRU is enabled.

What:		/config/nvmet/subsystems/NAME/passthru/admin_timeout
What:		/config/nvmet/subsystems/NAME/passthru/io_timeout
Date:		November 2020
KernelVersion:	5.11
Contact:	Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Description:
		admin_timeout: Shows or sets the admin command timeout for
		passthrough mode, in jiffies.

		io_timeout: Shows or sets the I/O command timeout for
		passthrough mode, in jiffies.

		Only available when CONFIG_NVME_TARGET_PASSTHRU is enabled.

What:		/config/nvmet/subsystems/NAME/passthru/clear_ids
Date:		June 2022
KernelVersion:	5.19
Contact:	Alan Adamson <alan.adamson@oracle.com>
Description:
		Shows or sets whether to clear identify data IDs in
		passthrough mode. Only available when
		CONFIG_NVME_TARGET_PASSTHRU is enabled.

What:		/config/nvmet/subsystems/NAME/attr_qid_max
Date:		August 2022
KernelVersion:	6.1
Contact:	Daniel Wagner <dwagner@suse.de>
Description:
		Shows or sets the maximum queue ID (number of I/O queues,
		u16). Must be between 1 and 128. Changing this value
		forces reconnection of all connected controllers.

What:		/config/nvmet/subsystems/NAME/attr_ieee_oui
Date:		November 2022
KernelVersion:	6.2
Contact:	Aleksandr Miloserdov <a.miloserdov@yadro.com>
Description:
		Shows or sets the IEEE OUI for this subsystem. Displayed
		in "0x%06x" format. Must be a 24-bit value. Cannot be
		changed after the subsystem has been discovered.

What:		/config/nvmet/subsystems/NAME/attr_firmware
Date:		November 2022
KernelVersion:	6.2
Contact:	Aleksandr Miloserdov <a.miloserdov@yadro.com>
Description:
		Shows or sets the firmware revision string for this
		subsystem. Must be a 1-8 byte ASCII string (characters
		0x20-0x7e). Cannot be changed after the subsystem has
		been discovered.

What:		/config/nvmet/subsystems/NAME/namespaces/NSID/resv_enable
Date:		November 2024
KernelVersion:	6.13
Contact:	Guixin Liu <kanie@linux.alibaba.com>
Description:
		Shows or sets whether persistent reservation support is
		enabled for this namespace. Accepts boolean value. The
		namespace must be disabled before modification.

What:		/config/nvmet/subsystems/NAME/attr_vendor_id
What:		/config/nvmet/subsystems/NAME/attr_subsys_vendor_id
Date:		January 2025
KernelVersion:	6.14
Contact:	Damien Le Moal <dlemoal@kernel.org>
Description:
		attr_vendor_id: Shows or sets the PCI vendor ID reported
		by this subsystem. Displayed in "0x%x" format.

		attr_subsys_vendor_id: Shows or sets the PCI subsystem
		vendor ID. Displayed in "0x%x" format.

What:		/config/nvmet/hosts/HOSTNQN/dhchap_key
What:		/config/nvmet/hosts/HOSTNQN/dhchap_ctrl_key
What:		/config/nvmet/hosts/HOSTNQN/dhchap_hash
What:		/config/nvmet/hosts/HOSTNQN/dhchap_dhgroup
Date:		June 2022
KernelVersion:	6.0
Contact:	Hannes Reinecke <hare@suse.de>
Description:
		DH-HMAC-CHAP authentication attributes.

		dhchap_key: Shows or sets the host secret key. Accepts a
		key string in "DHHC-1:" format.

		dhchap_ctrl_key: Shows or sets the controller secret key
		for bidirectional authentication. Same format as dhchap_key.

		dhchap_hash: Shows or sets the HMAC hash algorithm.
		Accepted values: "hmac(sha256)", "hmac(sha384)",
		"hmac(sha512)".

		dhchap_dhgroup: Shows or sets the Diffie-Hellman group for
		DH-HMAC-CHAP key exchange. Accepted values: "null",
		"ffdhe2048", "ffdhe3072", "ffdhe4096", "ffdhe6144".
		Non-null groups require the corresponding KPP crypto
		algorithm to be available.

		Only available when CONFIG_NVME_TARGET_AUTH is enabled.

What:		/config/nvmet/discovery_nqn
Date:		April 2024
KernelVersion:	6.9
Contact:	Hannes Reinecke <hare@kernel.org>
Description:
		Shows or sets the NQN of the discovery subsystem. The
		value must be unique and not duplicate any existing
		subsystem name.