1What: /config/nvmet/ports/N/addr_adrfam 2What: /config/nvmet/ports/N/addr_portid 3What: /config/nvmet/ports/N/addr_traddr 4What: /config/nvmet/ports/N/addr_trsvcid 5What: /config/nvmet/ports/N/addr_trtype 6What: /config/nvmet/ports/N/addr_treq 7Date: June 2016 8KernelVersion: 4.8 9Contact: Christoph Hellwig <hch@lst.de> 10Description: 11 Address attributes for an NVMe-oF target port. 12 13 addr_adrfam: Shows or sets the address family. Accepted 14 values: "pcie", "ipv4", "ipv6", "ib", "fc", "pci", "loop". 15 16 addr_portid: Shows or sets the port identifier (u16). 17 18 addr_traddr: Shows or sets the transport address string. 19 20 addr_trsvcid: Shows or sets the transport service identifier. 21 22 addr_trtype: Shows or sets the transport type. Accepted 23 values: "rdma", "fc", "tcp", "pci", "loop". Also 24 initializes default TSAS values. 25 26 addr_treq: Shows or sets the transport security requirements. 27 Accepted values: "not specified", "required", 28 "not required". For TCP with TLS1.3, "not specified" is 29 rejected. 30 31 All attributes require the port to be disabled before 32 modification. 33 34What: /config/nvmet/ports/N/referrals/NAME/addr_adrfam 35What: /config/nvmet/ports/N/referrals/NAME/addr_portid 36What: /config/nvmet/ports/N/referrals/NAME/addr_traddr 37What: /config/nvmet/ports/N/referrals/NAME/addr_trsvcid 38What: /config/nvmet/ports/N/referrals/NAME/addr_trtype 39What: /config/nvmet/ports/N/referrals/NAME/addr_treq 40What: /config/nvmet/ports/N/referrals/NAME/enable 41Date: June 2016 42KernelVersion: 4.8 43Contact: Christoph Hellwig <hch@lst.de> 44Description: 45 Address attributes and enable control for a referral entry 46 under a port. The addr_* attributes have the same semantics 47 as the corresponding port-level attributes. The enable 48 attribute shows or sets whether this referral is enabled 49 (boolean). 50 51What: /config/nvmet/ports/N/param_inline_data_size 52Date: June 2018 53KernelVersion: 4.19 54Contact: Steve Wise <swise@opengridcomputing.com> 55Description: 56 Shows or sets the inline data size for this port. Default 57 is -1 which lets the transport choose. The port must be 58 disabled before modification. 59 60What: /config/nvmet/ports/N/ana_groups/ID/ana_state 61Date: June 2018 62KernelVersion: 4.19 63Contact: Christoph Hellwig <hch@lst.de> 64Description: 65 Shows or sets the ANA (Asymmetric Namespace Access) state 66 for this group on this port. Accepted values: "optimized", 67 "non-optimized", "inaccessible", "persistent-loss", 68 "change". Changes trigger an ANA change event. 69 70What: /config/nvmet/ports/N/param_pi_enable 71Date: May 2020 72KernelVersion: 5.8 73Contact: Israel Rukshin <israelr@mellanox.com> 74Description: 75 Shows or sets whether protection information (PI) is 76 enabled/supported for this port. Accepts boolean value. 77 Only available when CONFIG_BLK_DEV_INTEGRITY is enabled. 78 The port must be disabled before modification. 79 80What: /config/nvmet/ports/N/addr_tsas 81Date: August 2023 82KernelVersion: 6.7 83Contact: Hannes Reinecke <hare@suse.de> 84Description: 85 Shows or sets the transport-specific address subtype. For 86 TCP transport, accepted values: "none", "tls1.3" (requires 87 CONFIG_NVME_TARGET_TCP_TLS). For RDMA transport, shows the 88 QP type: "connected" or "datagram". The port must be 89 disabled before modification. 90 91What: /config/nvmet/ports/N/param_max_queue_size 92Date: January 2024 93KernelVersion: 6.9 94Contact: Max Gurtovoy <mgurtovoy@nvidia.com> 95Description: 96 Shows or sets the maximum queue size for this port. Default 97 is -1 which lets the transport choose. The port must be 98 disabled before modification. 99 100What: /config/nvmet/ports/N/param_mdts 101Date: April 2026 102KernelVersion: 7.1 103Contact: Aurelien Aptel <aaptel@nvidia.com> 104Description: 105 Shows or sets the maximum data transfer size for this port. 106 Default is -1 which lets the transport choose. The port 107 must be disabled before modification. 108 109What: /config/nvmet/subsystems/NAME/attr_allow_any_host 110Date: June 2016 111KernelVersion: 4.8 112Contact: Christoph Hellwig <hch@lst.de> 113Description: 114 Shows or sets whether any host is allowed to connect. 115 Accepts boolean value. Cannot be set to 1 if explicit 116 hosts are linked in the allowed_hosts/ directory. 117 118What: /config/nvmet/subsystems/NAME/namespaces/NSID/device_path 119What: /config/nvmet/subsystems/NAME/namespaces/NSID/device_nguid 120What: /config/nvmet/subsystems/NAME/namespaces/NSID/enable 121Date: June 2016 122KernelVersion: 4.8 123Contact: Christoph Hellwig <hch@lst.de> 124Description: 125 Namespace attributes added with the initial NVMe target. 126 127 device_path: Shows or sets the backend block device path. 128 The namespace must be disabled before modification. 129 130 device_nguid: Shows or sets the NGUID (128-bit identifier). 131 Accepts 32 hex digits with optional "-" or ":" separators. 132 The namespace must be disabled before modification. 133 134 enable: Shows or sets whether this namespace is enabled 135 (boolean). 136 137What: /config/nvmet/subsystems/NAME/namespaces/NSID/device_uuid 138Date: June 2017 139KernelVersion: 4.13 140Contact: Johannes Thumshirn <jthumshirn@suse.de> 141Description: 142 Shows or sets the UUID for this namespace. The namespace 143 must be disabled before modification. 144 145What: /config/nvmet/subsystems/NAME/attr_version 146What: /config/nvmet/subsystems/NAME/attr_serial 147Date: July 2017 148KernelVersion: 4.13 149Contact: Johannes Thumshirn <jthumshirn@suse.de> 150Description: 151 attr_version: Shows or sets the NVMe version reported by 152 this subsystem. Format: "major.minor" or 153 "major.minor.tertiary". Cannot be changed after the 154 subsystem has been discovered. 155 156 attr_serial: Shows or sets the serial number. Must be a 157 1-20 byte ASCII string (characters 0x20-0x7e). Cannot be 158 changed after the subsystem has been discovered. 159 160What: /config/nvmet/subsystems/NAME/namespaces/NSID/ana_grpid 161Date: June 2018 162KernelVersion: 4.19 163Contact: Christoph Hellwig <hch@lst.de> 164Description: 165 Shows or sets the ANA (Asymmetric Namespace Access) Group 166 ID for this namespace. Must be between 1 and 128. Changing 167 triggers an ANA event notification. 168 169What: /config/nvmet/subsystems/NAME/namespaces/NSID/buffered_io 170Date: June 2018 171KernelVersion: 4.19 172Contact: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> 173Description: 174 Shows or sets whether buffered I/O is used for this 175 namespace. Accepts boolean value. The namespace must be 176 disabled before modification. 177 178What: /config/nvmet/subsystems/NAME/namespaces/NSID/p2pmem 179Date: October 2018 180KernelVersion: 4.20 181Contact: Logan Gunthorpe <logang@deltatee.com> 182Description: 183 Shows or sets the P2P DMA memory device for this namespace. 184 Accepts a PCI device BDF, "auto", or "none". The namespace 185 must be disabled before modification. Only available when 186 CONFIG_PCI_P2PDMA is enabled. 187 188What: /config/nvmet/subsystems/NAME/attr_cntlid_min 189What: /config/nvmet/subsystems/NAME/attr_cntlid_max 190Date: January 2020 191KernelVersion: 5.7 192Contact: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> 193Description: 194 attr_cntlid_min: Shows or sets the minimum controller ID 195 (u16). Must be nonzero and not greater than attr_cntlid_max. 196 197 attr_cntlid_max: Shows or sets the maximum controller ID 198 (u16). Must be nonzero and not less than attr_cntlid_min. 199 200What: /config/nvmet/subsystems/NAME/attr_model 201Date: January 2020 202KernelVersion: 5.7 203Contact: Mark Ruijter <MRuijter@onestopsystems.com> 204Description: 205 Shows or sets the model number for this subsystem. Must 206 be a 1-40 byte ASCII string (characters 0x20-0x7e). 207 Cannot be changed after the subsystem has been discovered. 208 209What: /config/nvmet/subsystems/NAME/attr_pi_enable 210Date: May 2020 211KernelVersion: 5.8 212Contact: Israel Rukshin <israelr@mellanox.com> 213Description: 214 Shows or sets whether protection information (PI) is 215 enabled/supported for this subsystem. Accepts boolean 216 value. Only available when CONFIG_BLK_DEV_INTEGRITY is 217 enabled. 218 219What: /config/nvmet/subsystems/NAME/namespaces/NSID/revalidate_size 220Date: May 2020 221KernelVersion: 5.8 222Contact: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> 223Description: 224 Write-only. Writing 1 triggers namespace size revalidation. 225 If the size has changed, a namespace changed AEN is sent. 226 The namespace must be enabled. 227 228What: /config/nvmet/subsystems/NAME/passthru/device_path 229What: /config/nvmet/subsystems/NAME/passthru/enable 230Date: July 2020 231KernelVersion: 5.9 232Contact: Logan Gunthorpe <logang@deltatee.com> 233Description: 234 Passthrough mode attributes. 235 236 device_path: Shows or sets the NVMe controller character 237 device path (e.g., /dev/nvme0). Cannot be changed while 238 the passthrough controller is active. 239 240 enable: Shows or sets whether passthrough mode is enabled 241 (boolean). 242 243 Only available when CONFIG_NVME_TARGET_PASSTHRU is enabled. 244 245What: /config/nvmet/subsystems/NAME/passthru/admin_timeout 246What: /config/nvmet/subsystems/NAME/passthru/io_timeout 247Date: November 2020 248KernelVersion: 5.11 249Contact: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> 250Description: 251 admin_timeout: Shows or sets the admin command timeout for 252 passthrough mode, in jiffies. 253 254 io_timeout: Shows or sets the I/O command timeout for 255 passthrough mode, in jiffies. 256 257 Only available when CONFIG_NVME_TARGET_PASSTHRU is enabled. 258 259What: /config/nvmet/subsystems/NAME/passthru/clear_ids 260Date: June 2022 261KernelVersion: 5.19 262Contact: Alan Adamson <alan.adamson@oracle.com> 263Description: 264 Shows or sets whether to clear identify data IDs in 265 passthrough mode. Only available when 266 CONFIG_NVME_TARGET_PASSTHRU is enabled. 267 268What: /config/nvmet/subsystems/NAME/attr_qid_max 269Date: August 2022 270KernelVersion: 6.1 271Contact: Daniel Wagner <dwagner@suse.de> 272Description: 273 Shows or sets the maximum queue ID (number of I/O queues, 274 u16). Must be between 1 and 128. Changing this value 275 forces reconnection of all connected controllers. 276 277What: /config/nvmet/subsystems/NAME/attr_ieee_oui 278Date: November 2022 279KernelVersion: 6.2 280Contact: Aleksandr Miloserdov <a.miloserdov@yadro.com> 281Description: 282 Shows or sets the IEEE OUI for this subsystem. Displayed 283 in "0x%06x" format. Must be a 24-bit value. Cannot be 284 changed after the subsystem has been discovered. 285 286What: /config/nvmet/subsystems/NAME/attr_firmware 287Date: November 2022 288KernelVersion: 6.2 289Contact: Aleksandr Miloserdov <a.miloserdov@yadro.com> 290Description: 291 Shows or sets the firmware revision string for this 292 subsystem. Must be a 1-8 byte ASCII string (characters 293 0x20-0x7e). Cannot be changed after the subsystem has 294 been discovered. 295 296What: /config/nvmet/subsystems/NAME/namespaces/NSID/resv_enable 297Date: November 2024 298KernelVersion: 6.13 299Contact: Guixin Liu <kanie@linux.alibaba.com> 300Description: 301 Shows or sets whether persistent reservation support is 302 enabled for this namespace. Accepts boolean value. The 303 namespace must be disabled before modification. 304 305What: /config/nvmet/subsystems/NAME/attr_vendor_id 306What: /config/nvmet/subsystems/NAME/attr_subsys_vendor_id 307Date: January 2025 308KernelVersion: 6.14 309Contact: Damien Le Moal <dlemoal@kernel.org> 310Description: 311 attr_vendor_id: Shows or sets the PCI vendor ID reported 312 by this subsystem. Displayed in "0x%x" format. 313 314 attr_subsys_vendor_id: Shows or sets the PCI subsystem 315 vendor ID. Displayed in "0x%x" format. 316 317What: /config/nvmet/hosts/HOSTNQN/dhchap_key 318What: /config/nvmet/hosts/HOSTNQN/dhchap_ctrl_key 319What: /config/nvmet/hosts/HOSTNQN/dhchap_hash 320What: /config/nvmet/hosts/HOSTNQN/dhchap_dhgroup 321Date: June 2022 322KernelVersion: 6.0 323Contact: Hannes Reinecke <hare@suse.de> 324Description: 325 DH-HMAC-CHAP authentication attributes. 326 327 dhchap_key: Shows or sets the host secret key. Accepts a 328 key string in "DHHC-1:" format. 329 330 dhchap_ctrl_key: Shows or sets the controller secret key 331 for bidirectional authentication. Same format as dhchap_key. 332 333 dhchap_hash: Shows or sets the HMAC hash algorithm. 334 Accepted values: "hmac(sha256)", "hmac(sha384)", 335 "hmac(sha512)". 336 337 dhchap_dhgroup: Shows or sets the Diffie-Hellman group for 338 DH-HMAC-CHAP key exchange. Accepted values: "null", 339 "ffdhe2048", "ffdhe3072", "ffdhe4096", "ffdhe6144". 340 Non-null groups require the corresponding KPP crypto 341 algorithm to be available. 342 343 Only available when CONFIG_NVME_TARGET_AUTH is enabled. 344 345What: /config/nvmet/discovery_nqn 346Date: April 2024 347KernelVersion: 6.9 348Contact: Hannes Reinecke <hare@kernel.org> 349Description: 350 Shows or sets the NQN of the discovery subsystem. The 351 value must be unique and not duplicate any existing 352 subsystem name. 353