.. _nbft.h: **nbft.h** NVM Express Boot Specification, Revision 1.0 Note: this API is currently unstable, subject to further additions. .. c:enum:: nbft_desc_type NBFT Elements - Descriptor Types (Figure 5) **Constants** ``NBFT_DESC_HEADER`` Header: an ACPI structure header with some additional NBFT specific info. ``NBFT_DESC_CONTROL`` Control Descriptor: indicates the location of host, HFI, SSNS, security, and discovery descriptors. ``NBFT_DESC_HOST`` Host Descriptor: host information. ``NBFT_DESC_HFI`` HFI Descriptor: an indexable table of HFI Descriptors, one for each fabric interface on the host. ``NBFT_DESC_SSNS`` Subsystem Namespace Descriptor: an indexable table of SSNS Descriptors. ``NBFT_DESC_SECURITY`` Security Descriptor: an indexable table of Security descriptors. ``NBFT_DESC_DISCOVERY`` Discovery Descriptor: an indexable table of Discovery Descriptors. ``NBFT_DESC_HFI_TRINFO`` HFI Transport Descriptor: indicated by an HFI Descriptor, corresponds to a specific transport for a single HFI. ``NBFT_DESC_RESERVED_8`` Reserved. ``NBFT_DESC_SSNS_EXT_INFO`` SSNS Extended Info Descriptor: indicated by an SSNS Descriptor if required. .. c:enum:: nbft_trtype NBFT Interface Transport Types (Figure 7) **Constants** ``NBFT_TRTYPE_TCP`` NVMe/TCP (802.3 + TCP/IP). String Designator "tcp". .. c:struct:: nbft_heap_obj NBFT Header Driver Signature **Definition** :: struct nbft_heap_obj { __le32 offset; __le16 length; }; **Members** ``offset`` Offset in bytes of the heap object, if any, from byte offset 0h of the NBFT Table Header. ``length`` Length in bytes of the heap object, if any. .. c:struct:: nbft_header NBFT Table - Header (Figure 8) **Definition** :: struct nbft_header { char signature[4]; __le32 length; __u8 major_revision; __u8 checksum; char oem_id[6]; char oem_table_id[8]; __le32 oem_revision; __le32 creator_id; __le32 creator_revision; __le32 heap_offset; __le32 heap_length; struct nbft_heap_obj driver_dev_path_sig; __u8 minor_revision; __u8 reserved[13]; }; **Members** ``signature`` Signature: An ASCII string representation of the table identifier. This field shall be set to the value 4E424654h (i.e. "NBFT", see #NBFT_HEADER_SIG). ``length`` Length: The length of the table, in bytes, including the header, starting from offset 0h. This field is used to record the size of the entire table. ``major_revision`` Major Revision: The major revision of the structure corresponding to the Signature field. Larger major revision numbers should not be assumed backward compatible to lower major revision numbers with the same signature. ``checksum`` Checksum: The entire table, including the Checksum field, shall sum to 0h to be considered valid. ``oem_id`` OEMID shall be populated by the NBFT driver writer by an OEM-supplied string that identifies the OEM. All trailing bytes shall be NULL. ``oem_table_id`` OEM Table ID: This field shall be populated by the NBFT driver writer with an OEM-supplied string that the OEM uses to identify the particular data table. This field is particularly useful when defining a definition block to distinguish definition block functions. The OEM assigns each dissimilar table a new OEM Table ID. ``oem_revision`` OEM Revision: An OEM-supplied revision number. Larger numbers are assumed to be newer revisions. ``creator_id`` Creator ID: Vendor ID of utility that created the table. For instance, this may be the ID for the ASL Compiler. ``creator_revision`` Creator Revision: Revision of utility that created the table. For instance, this may be the ID for the ASL Compiler. ``heap_offset`` Heap Offset (HO): This field indicates the offset in bytes of the heap, if any, from byte offset 0h of the NBFT Table Header. ``heap_length`` Heap Length (HL): The length of the heap, if any. ``driver_dev_path_sig`` Driver Signature Heap Object Reference: This field indicates the offset in bytes of a heap object containing the Driver Signature, if any, from byte offset 0h of the NBFT Table Header. ``minor_revision`` Minor Revision: The minor revision of the structure corresponding to the Signature field. If the major revision numbers are the same, any minor revision number differences shall be backwards compatible with the same signature. ``reserved`` Reserved. .. c:struct:: nbft_control NBFT Table - Control Descriptor (Figure 8) **Definition** :: struct nbft_control { __u8 structure_id; __u8 major_revision; __u8 minor_revision; __u8 reserved1; __le16 csl; __u8 flags; __u8 reserved2; struct nbft_heap_obj hdesc; __u8 hsv; __u8 reserved3; __le32 hfio; __le16 hfil; __u8 hfiv; __u8 num_hfi; __le32 ssnso; __le16 ssnsl; __u8 ssnsv; __u8 num_ssns; __le32 seco; __le16 secl; __u8 secv; __u8 num_sec; __le32 disco; __le16 discl; __u8 discv; __u8 num_disc; __u8 reserved4[16]; }; **Members** ``structure_id`` Structure ID: This field specifies the element (refer to :c:type:`enum nbft_desc_type `). This field shall be set to 1h (i.e., Control, #NBFT_DESC_CONTROL). ``major_revision`` Major Revision: The major revision of the structure corresponding to the Signature field. Larger major revision numbers should not be assumed backward compatible to lower major revision numbers with the same signature. ``minor_revision`` Minor Revision: The minor revision of the structure corresponding to the signature field. If the major revision numbers are the same, any minor revision number differences shall be backwards compatible with the same signature. ``reserved1`` Reserved. ``csl`` Control Structure Length (CSL): This field indicates the length in bytes of the Control Descriptor. ``flags`` Flags, see :c:type:`enum nbft_control_flags `. ``reserved2`` Reserved. ``hdesc`` Host Descriptor (HDESC): This field indicates the location and length of the Host Descriptor (see :c:type:`struct nbft_host `). ``hsv`` Host Descriptor Version (HSV): This field indicates the version of the Host Descriptor. ``reserved3`` Reserved. ``hfio`` HFI Descriptor List Offset (HFIO): If this field is set to a non-zero value, then this field indicates the offset in bytes of the HFI Descriptor List, if any, from byte offset 0h of the NBFT Table Header. If the **num_hfi** field is cleared to 0h, then this field is reserved. ``hfil`` HFI Descriptor Length (HFIL): This field indicates the length in bytes of each HFI Descriptor, if any. If the **num_hfi** field is cleared to 0h, then this field is reserved. ``hfiv`` HFI Descriptor Version (HFIV): This field indicates the version of each HFI Descriptor. ``num_hfi`` Number of Host Fabric Interface Descriptors (NumHFI): This field indicates the number of HFI Descriptors (see :c:type:`struct nbft_hfi `) in the HFI Descriptor List, if any. If no interfaces have been configured, then this field shall be cleared to 0h. ``ssnso`` SSNS Descriptor List Offset (SSNSO):: This field indicates the offset in bytes of the SSNS Descriptor List, if any, from byte offset 0h of the NBFT Table Header. If the **num_ssns** field is cleared to 0h, then this field is reserved. ``ssnsl`` SSNS Descriptor Length (SSNSL): This field indicates the length in bytes of each SSNS Descriptor, if any. If the **num_ssns** field is cleared to 0h, then this field is reserved. ``ssnsv`` SSNS Descriptor Version (SSNSV): This field indicates the version of the SSNS Descriptor. ``num_ssns`` Number of Subsystem and Namespace Descriptors (NumSSNS): This field indicates the number of Subsystem Namespace (SSNS) Descriptors (see :c:type:`struct nbft_ssns `) in the SSNS Descriptor List, if any. ``seco`` Security Profile Descriptor List Offset (SECO): This field indicates the offset in bytes of the Security Profile Descriptor List, if any, from byte offset 0h of the NBFT Table Header. If the **num_sec** field is cleared to 0h, then this field is reserved. ``secl`` Security Profile Descriptor Length (SECL): This field indicates the length in bytes of each Security Profile Descriptor, if any. If the **num_sec** field is cleared to 0h, then this field is reserved. ``secv`` Security Profile Descriptor Version (SECV): This field indicates the version of the Security Profile Descriptor. ``num_sec`` Number of Security Profile Descriptors (NumSec): This field indicates the number of Security Profile Descriptors (see :c:type:`struct nbft_security `), if any, in the Security Profile Descriptor List. ``disco`` Discovery Descriptor Offset (DISCO): This field indicates the offset in bytes of the Discovery Descriptor List, if any, from byte offset 0h of the NBFT Table Header. If the **num_disc** field is cleared to 0h, then this field is reserved. ``discl`` Discovery Descriptor Length (DISCL): This field indicates the length in bytes of each Discovery Descriptor, if any. If the **num_disc** field is cleared to 0h, then this field is reserved. ``discv`` Discovery Descriptor Version (DISCV): This field indicates the version of the Discovery Descriptor. ``num_disc`` Number of Discovery Descriptors (NumDisc): This field indicates the number of Discovery Descriptors (see :c:type:`struct nbft_discovery `), if any, in the Discovery Descriptor List, if any. ``reserved4`` Reserved. .. c:enum:: nbft_control_flags Control Descriptor Flags **Constants** ``NBFT_CONTROL_VALID`` Block Valid: indicates that the structure is valid. .. c:struct:: nbft_host Host Descriptor (Figure 9) **Definition** :: struct nbft_host { __u8 structure_id; __u8 flags; __u8 host_id[16]; struct nbft_heap_obj host_nqn_obj; __u8 reserved[8]; }; **Members** ``structure_id`` Structure ID: This field shall be set to 2h (i.e., Host Descriptor; #NBFT_DESC_HOST). ``flags`` Host Flags, see :c:type:`enum nbft_host_flags `. ``host_id`` Host ID: This field shall be set to the Host Identifier. This field shall not be empty if the NBFT and NVMe Boot are supported by the Platform. ``host_nqn_obj`` Host NQN Heap Object Reference: this field indicates a heap object containing a Host NQN. This object shall not be empty if the NBFT and NVMe Boot are supported by the Platform. ``reserved`` Reserved. .. c:enum:: nbft_host_flags Host Flags **Constants** ``NBFT_HOST_VALID`` Descriptor Valid: If set to 1h, then this descriptor is valid. If cleared to 0h, then this descriptor is reserved. ``NBFT_HOST_HOSTID_CONFIGURED`` HostID Configured: If set to 1h, then the Host ID field contains an administratively-configured value. If cleared to 0h, then the Host ID field contains a driver default value. ``NBFT_HOST_HOSTNQN_CONFIGURED`` Host NQN Configured: If set to 1h, then the Host NQN indicated by the Host NQN Heap Object Reference field (:c:type:`struct nbft_host `.host_nqn) contains an administratively-configured value. If cleared to 0h, then the Host NQN indicated by the Host NQN Offset field contains a driver default value. ``NBFT_HOST_PRIMARY_ADMIN_MASK`` Mask to get Primary Administrative Host Descriptor: indicates whether the Host Descriptor in this NBFT was selected as the primary NBFT for administrative purposes of platform identity as a hint to the OS. If multiple NBFT tables are present, only one NBFT should be administratively selected. There is no enforcement mechanism for this to be coordinated between multiple NBFT tables, but this field should be set to Selected (#NBFT_HOST_PRIMARY_ADMIN_SELECTED) if more than one NBFT is present. ``NBFT_HOST_PRIMARY_ADMIN_NOT_INDICATED`` Not Indicated by Driver: The driver that created this NBFT provided no administrative priority hint for this NBFT. ``NBFT_HOST_PRIMARY_ADMIN_UNSELECTED`` Unselected: The driver that created this NBFT explicitly indicated that this NBFT should not be prioritized over any other NBFT. ``NBFT_HOST_PRIMARY_ADMIN_SELECTED`` Selected: The driver that created this NBFT explicitly indicated that this NBFT should be prioritized over any other NBFT. .. c:struct:: nbft_hfi Host Fabric Interface (HFI) Descriptor (Figure 11) **Definition** :: struct nbft_hfi { __u8 structure_id; __u8 index; __u8 flags; __u8 trtype; __u8 reserved1[12]; struct nbft_heap_obj trinfo_obj; __u8 reserved2[10]; }; **Members** ``structure_id`` Structure ID: This field shall be set to 3h (i.e., Host Fabric Interface Descriptor; #NBFT_DESC_HFI). ``index`` HFI Descriptor Index: This field indicates the number of this HFI Descriptor in the Host Fabric Interface Descriptor List. ``flags`` HFI Descriptor Flags, see :c:type:`enum nbft_hfi_flags `. ``trtype`` HFI Transport Type, see :c:type:`enum nbft_trtype `. ``reserved1`` Reserved. ``trinfo_obj`` HFI Transport Info Descriptor Heap Object Reference: If this field is set to a non-zero value, then this field indicates the location and size of a heap object containing a HFI Transport Info. ``reserved2`` Reserved. .. c:enum:: nbft_hfi_flags HFI Descriptor Flags **Constants** ``NBFT_HFI_VALID`` Descriptor Valid: If set to 1h, then this descriptor is valid. If cleared to 0h, then this descriptor is reserved. .. c:struct:: nbft_hfi_info_tcp HFI Transport Info Descriptor - NVMe/TCP (Figure 13) **Definition** :: struct nbft_hfi_info_tcp { __u8 structure_id; __u8 version; __u8 trtype; __u8 trinfo_version; __le16 hfi_index; __u8 flags; __le32 pci_sbdf; __u8 mac_addr[6]; __le16 vlan; __u8 ip_origin; __u8 ip_address[16]; __u8 subnet_mask_prefix; __u8 ip_gateway[16]; __u8 reserved1; __le16 route_metric; __u8 primary_dns[16]; __u8 secondary_dns[16]; __u8 dhcp_server[16]; struct nbft_heap_obj host_name_obj; __u8 reserved2[18]; }; **Members** ``structure_id`` Structure ID: This field shall be set to 7h (i.e., HFI Transport Info; #NBFT_DESC_HFI_TRINFO). ``version`` Version: This field shall be set to 1h. ``trtype`` HFI Transport Type, see :c:type:`enum nbft_trtype `: This field shall be set to 03h (i.e., NVMe/TCP; #NBFT_TRTYPE_TCP). ``trinfo_version`` Transport Info Version: Implementations compliant to this specification shall set this field to 1h. ``hfi_index`` HFI Descriptor Index: The value of the HFI Descriptor Index field of the HFI Descriptor (see :c:type:`struct nbft_hfi `.index) whose HFI Transport Info Descriptor Heap Object Reference field indicates this HFI Transport Info Descriptor. ``flags`` HFI Transport Flags, see :c:type:`enum nbft_hfi_info_tcp_flags `. ``pci_sbdf`` PCI Express Routing ID for the HFI Transport Function: This field indicates the PCI Express Routing ID as specified in the PCI Express Base Specification. ``mac_addr`` MAC Address: The MAC address of this HFI, in EUI-48TM format, as defined in the IEEE Guidelines for Use of Extended Unique Identifiers. This field shall be set to a non-zero value. ``vlan`` VLAN: If this field is set to a non-zero value, then this field contains the VLAN identifier if the VLAN associated with this HFI, as defined in IEEE 802.1q-2018. If no VLAN is associated with this HFI, then this field shall be cleared to 0h. ``ip_origin`` IP Origin: If this field is set to a non-zero value, then this field indicates the source of Ethernet L3 configuration information used by the driver for this interface. Valid values are defined in the Win 32 API: NL_PREFIX_ORIGIN enumeration specification. This field should be cleared to 0h if the IP Origin field is unused by driver. ``ip_address`` IP Address: This field indicates the IPv4 or IPv6 address of this HFI. This field shall be set to a non-zero value. ``subnet_mask_prefix`` Subnet Mask Prefix: This field indicates the IPv4 or IPv6 subnet mask in CIDR routing prefix notation. ``ip_gateway`` IP Gateway: If this field is set to a non-zero value, this field indicates the IPv4 or IPv6 address of the IP gateway for this HFI. If this field is cleared to 0h, then no IP gateway is specified. ``reserved1`` Reserved. ``route_metric`` Route Metric: If this field is set to a non-zero value, this field indicates the cost value for the route indicated by this HF. This field contains the value utilized by the pre-OS driver when chosing among all available routes. Lower values relate to higher priority. Refer to IETF RFC 4249. If the pre-OS driver supports routing and did not configure a specific route metric for this interface, then the pre-OS driver should set this value to 500. If the pre-OS driver does not support routing, then this field should be cleared to 0h. ``primary_dns`` Primary DNS: If this field is set to a non-zero value, this field indicates the IPv4 or IPv6 address of the Primary DNS server for this HFI, if any, from byte offset 0h of the NBFT Table Header. If this field is cleared to 0h, then no Primary DNS is specified. ``secondary_dns`` Secondary DNS: If this field is set to a non-zero value, this field indicates the IPv4 or IPv6 address of the Secondary DNS server for this HFI, if any, from byte offset 0h of the NBFT Table Header. If this field is cleared to 0h, then no Secondary DNS is specified. ``dhcp_server`` DHCP Server: If the DHCP Override bit is set to 1h, then this field indicates the IPv4 or IPv6 address of the DHCP server used to assign this HFI address. If that bit is cleared to 0h, then this field is reserved. ``host_name_obj`` Host Name Heap Object Reference: If this field is set to a non-zero value, then this field indicates the location and size of a heap object containing a Host Name string. ``reserved2`` Reserved. .. c:enum:: nbft_hfi_info_tcp_flags HFI Transport Flags **Constants** ``NBFT_HFI_INFO_TCP_VALID`` Descriptor Valid: if set to 1h, then this descriptor is valid. If cleared to 0h, then this descriptor is reserved. ``NBFT_HFI_INFO_TCP_GLOBAL_ROUTE`` Global Route vs. Link Local Override Flag: if set to 1h, then the BIOS utilized this interface described by HFI to be the default route with highest priority. If cleared to 0h, then routes are local to their own scope. ``NBFT_HFI_INFO_TCP_DHCP_OVERRIDE`` DHCP Override: if set to 1, then HFI information was populated by consuming the DHCP on this interface. If cleared to 0h, then the HFI information was set administratively by a configuration interface to the driver and pre-OS envrionment. .. c:struct:: nbft_ssns Subsystem Namespace (SSNS) Descriptor (Figure 15) **Definition** :: struct nbft_ssns { __u8 structure_id; __le16 index; __le16 flags; __u8 trtype; __le16 trflags; __u8 primary_discovery_ctrl_index; __u8 reserved1; struct nbft_heap_obj subsys_traddr_obj; struct nbft_heap_obj subsys_trsvcid_obj; __le16 subsys_port_id; __le32 nsid; __u8 nidt; __u8 nid[16]; __u8 security_desc_index; __u8 primary_hfi_desc_index; __u8 reserved2; struct nbft_heap_obj secondary_hfi_assoc_obj; struct nbft_heap_obj subsys_ns_nqn_obj; struct nbft_heap_obj ssns_extended_info_desc_obj; __u8 reserved3[62]; }; **Members** ``structure_id`` Structure ID: This field shall be set to 4h (i.e., SSNS; #NBFT_DESC_SSNS). ``index`` SSNS Descriptor Index: This field indicates the number of this Subsystem Namespace Descriptor in the Subsystem Namespace Descriptor List. ``flags`` SSNS Flags, see :c:type:`enum nbft_ssns_flags `. ``trtype`` Transport Type, see :c:type:`enum nbft_trtype `. ``trflags`` Transport Specific Flags, see :c:type:`enum nbft_ssns_trflags `. ``primary_discovery_ctrl_index`` Primary Discovery Controller Index: The Discovery Descriptor Index field of the Discovery Descriptor (see :c:type:`struct nbft_discovery `) that is associated with this SSNS Descriptor. If a Discovery controller was used to establish this record this value shall be set to a non-zero value. If this namespace was associated with multiple Discovery controllers, those Discovery controllers shall have records in the Discovery Descriptor to facilitate multi-path rediscovery as required. If no Discovery controller was utilized to inform this namespace record, this field shall be cleared to 0h. ``reserved1`` Reserved. ``subsys_traddr_obj`` Subsystem Transport Address Heap Object Reference: This field indicates the location and size of a heap object containing the Subsystem Transport Address. For IP based transports types, shall be an IP Address. ``subsys_trsvcid_obj`` Subsystem Transport Service Identifier Heap Object Reference: This field indicates the location and size of a heap object containing an array of bytes indicating the Subsystem Transport Service Identifier. See :c:type:`enum nbft_trtype `. ``subsys_port_id`` Subsystem Port ID: Port in the NVM subsystem associated with this transport address used by the pre-OS driver. ``nsid`` Namespace ID: This field indicates the namespace identifier (NSID) of the namespace indicated by this descriptor. This field shall be cleared to 0h if not specified by the user. If this value is cleared to 0h, then consumers of the NBFT shall rely on the NID. ``nidt`` Namespace Identifier Type (NIDT): This field contains the value of the Namespace Identifier Type (NIDT) field in the Namespace Identification Descriptor for the namespace indicated by this descriptor. If a namespace supports multiple NIDT entries for uniqueness, the order of preference is NIDT field value of 3h (i.e., UUID) before 2h (i.e., NSGUID), and 2h before 1h (i.e., EUI-64). ``nid`` Namespace Identifier (NID): This field contains the value of the Namespace Identifier (NID) field in the Namespace Identification Descriptor for the namespace indicated by this descriptor. ``security_desc_index`` Security Profile Descriptor Index: If the Use Security Flag bit in the SSNS Flags field is set to 1h, then this field indicates the value of the Security Profile Descriptor Index field of the Security Profile Descriptor (see :c:type:`struct nbft_security `) associated with this namespace. If the Use Security Flag bit is cleared to 0h, then no Security Profile Descriptor is associated with this namespace and this field is reserved. ``primary_hfi_desc_index`` Primary HFI Descriptor Index: This field indicates the value of the HFI Descriptor Index field of the HFI Descriptor (see :c:type:`struct nbft_hfi `) for the interface associated with this namespace. If multiple HFIs are associated with this record, subsequent interfaces should be populated in the Secondary HFI Associations field. ``reserved2`` Reserved. ``secondary_hfi_assoc_obj`` Secondary HFI Associations Heap Object Reference: If this field is set to a non-zero value, then this field indicates an array of bytes, in which each byte contains the value of the HFI Descriptor Index field of an HFI Descriptor in the HFI Descriptor List. If this field is cleared to 0h, then no secondary HFI associations are specified. ``subsys_ns_nqn_obj`` Subsystem and Namespace NQN Heap Object Reference: This field indicates the location and size of a heap object containing the Subsystem and Namespace NQN. ``ssns_extended_info_desc_obj`` SSNS Extended Information Descriptor Heap Object Reference: If the SSNS Extended Info In-use Flag bit is set to 1h, then this field indicates the offset in bytes of a heap object containing an SSNS Extended Information Descriptor (see :c:type:`struct nbft_ssns_ext_info `) heap object from byte offset 0h of the NBFT Table Header. If the SSNS Extended Info In-use Flag bit is cleared to 0h, then this field is reserved. ``reserved3`` Reserved. .. c:enum:: nbft_ssns_flags Subsystem and Namespace Specific Flags Field (Figure 16) **Constants** ``NBFT_SSNS_VALID`` Descriptor Valid: If set to 1h, then this descriptor is valid. If cleared to 0h, then this descriptor is not valid. A host that supports NVMe-oF Boot, but does not currently have a remote Subsystem and Namespace assigned may clear this bit to 0h. ``NBFT_SSNS_NON_BOOTABLE_ENTRY`` Non-bootable Entry Flag: If set to 1h, this flag indicates that this SSNS Descriptor contains a namespace of administrative purpose to the boot process, but the pre-OS may not have established connectivity to or evaluated the contents of this Descriptor. Such namespaces may contain supplemental data deemed relevant by the Administrator as part of the pre-OS to OS hand off. This may include properties such as a UEFI device path that may not have been created for this namespace. This means an OS runtime may still require the contents of such a namespace to complete later stages of boot. If cleared to 0h, then this namespace did not have any special administrative intent. ``NBFT_SSNS_USE_SECURITY_FIELD`` Use Security Flag: If set to 1h, then there is a Security Profile Descriptor associated with this SSNS record and the Security Profile Descriptor Index field is valid. If cleared to 0h, then there is no Security Profile Descriptor associated with this SSNS record and the Security Profile Descriptor Index field is not valid. ``NBFT_SSNS_DHCP_ROOT_PATH_OVERRIDE`` DHCP Root-Path Override Flag: If set to 1h, then this SSNS descriptor was populated by consuming the DHCP Root-Path on this interface. If cleared to 0h, then the DHCP Root-Path was not used in populating the SSNS descriptor. ``NBFT_SSNS_EXTENDED_INFO_IN_USE`` SSNS Extended Info In-use Flag: If set to 1h, then the SSNS Extended Information Offset field and the SSNS Extended Information Length field are valid. This flag, if set to 1h, indicates that a Subsystem and Namespace Extended Information Descriptor corresponding to this descriptor is present. ``NBFT_SSNS_SEPARATE_DISCOVERY_CTRL`` Separate Discovery Controller Flag: If set to 1h, then the Discovery controller associated with this volume is on a different transport address than the specified in the Subsystem Transport Address Heap Object Reference. If cleared to 0h, then the Discovery controller is the same as the Subsystem Transport Address Heap Object Reference. ``NBFT_SSNS_DISCOVERED_NAMESPACE`` Discovered Namespace Flag: If set to 1h, then this namespace was acquired through discovery. If cleared to 0h, then this namespace was explicitly configured in the system. ``NBFT_SSNS_UNAVAIL_NAMESPACE_MASK`` Mask to get Unavailable Namespace Flag: This field indicates the availability of the namespace at a specific point in time. Such use is only a hint and its use does not guarantee the availability of that referenced namespace at any future point in time. ``NBFT_SSNS_UNAVAIL_NAMESPACE_NOTIND`` Not Indicated by Driver: No information is provided. ``NBFT_SSNS_UNAVAIL_NAMESPACE_AVAIL`` Available: A referenced namespace described by this flag was previously accessible by the pre-OS driver. ``NBFT_SSNS_UNAVAIL_NAMESPACE_UNAVAIL`` Unavailable: This namespace was administratively configured but unattempted, unavailable or inaccessible when establishing connectivity by the pre-OS driver. .. c:enum:: nbft_ssns_trflags SSNS Transport Specific Flags Field (Figure 17) **Constants** ``NBFT_SSNS_TRFLAG_VALID`` Transport Specific Flags in Use: If set to 1h, then this descriptor is valid. If cleared to 0h, then this descriptor is not valid. ``NBFT_SSNS_PDU_HEADER_DIGEST`` PDU Header Digest (HDGST) Flag: If set to 1h, then the host or administrator required the connection described by this Subsystem and Namespace Descriptor to use the NVM Header Digest Enabled. A consumer of this information should attempt to use NVM Header Digest when recreating this connection if enabled. If cleared to 0h, then the host or administrator did not require the connection described by this Subsystem and Namespace Descriptor to use the NVM Header Digest Enabled. ``NBFT_SSNS_DATA_DIGEST`` Data Digest (DDGST) Flag: If set to 1h, then the host or administrator required the connection described by this Subsystem and Namespace Descriptor to use the NVM Data Digest Enabled. If cleared to 0h, then the host or administrator did not require the connection described by this Subsystem and Namespace Descriptor to use the NVM Data Digest Enabled. A consumer of this field should attempt to use NVM Data Digest when recreating this connection if enabled. .. c:struct:: nbft_ssns_ext_info Subsystem and Namespace Extended Information Descriptor (Figure 19) **Definition** :: struct nbft_ssns_ext_info { __u8 structure_id; __u8 version; __le16 ssns_index; __le32 flags; __le16 cntlid; __le16 asqsz; struct nbft_heap_obj dhcp_root_path_str_obj; }; **Members** ``structure_id`` Structure ID: This field shall be set to 9h (i.e., SSNS Extended Info; #NBFT_DESC_SSNS_EXT_INFO). ``version`` Version: This field shall be set to 1h. ``ssns_index`` SSNS Descriptor Index: This field indicates the value of the SSNS Descriptor Index field of the Subsystem and Namespace Descriptor (see :c:type:`struct nbft_ssns `) whose SSNS Extended Information Descriptor Heap Object Reference field indicates this descriptor. ``flags`` Flags, see :c:type:`enum nbft_ssns_ext_info_flags `. ``cntlid`` Controller ID: The controller identifier of the first controller associated with the Admin Queue by the driver. If a controller identifier is not administratively specified or direct configuration is not supported by the driver, then this field shall be cleared to 0h. ``asqsz`` Admin Submission Queue Size (ASQSZ): The Admin Submission Queue Size utilized for the respective SSNS by the driver. ``dhcp_root_path_str_obj`` DHCP Root Path String Heap Object Reference: If the SSNS DHCP Root Path Override (#NBFT_SSNS_DHCP_ROOT_PATH_OVERRIDE) flag bit is set to 1h, then this field indicates the offset in bytes of a heap object containing an DHCP Root Path String used by the driver. If the SNSS DHCP Root Path Override flag bit is cleared to 0h, then this field is reserved. .. c:enum:: nbft_ssns_ext_info_flags Subsystem and Namespace Extended Information Descriptor Flags **Constants** ``NBFT_SSNS_EXT_INFO_VALID`` Descriptor Valid: If set to 1h, then this descriptor is valid. If cleared to 0h, then this descriptor is reserved. ``NBFT_SSNS_EXT_INFO_ADMIN_ASQSZ`` Administrative ASQSZ: If set to 1h, then the value of the ASQSZ field was provided by administrative configuration for this SSNS record. If cleared to 0h, then the value of the ASQSZ field was either obtained by discovery or assumed by the driver. .. c:struct:: nbft_security Security Profile Descriptor (Figure 21) **Definition** :: struct nbft_security { __u8 structure_id; __u8 index; __le16 flags; __u8 secret_type; __u8 reserved1; struct nbft_heap_obj sec_chan_alg_obj; struct nbft_heap_obj auth_proto_obj; struct nbft_heap_obj cipher_suite_obj; struct nbft_heap_obj dh_grp_obj; struct nbft_heap_obj sec_hash_func_obj; struct nbft_heap_obj sec_keypath_obj; __u8 reserved2[22]; }; **Members** ``structure_id`` Structure ID: This field shall be set to 5h (i.e., Security; #NBFT_DESC_SECURITY). ``index`` Security Profile Descriptor Index: This field indicates the number of this Security Profile Descriptor in the Security Profile Descriptor List. ``flags`` Security Profile Descriptor Flags, see :c:type:`enum nbft_security_flags `. ``secret_type`` Secret Type, see :c:type:`enum nbft_security_secret_type `. ``reserved1`` Reserved. ``sec_chan_alg_obj`` Secure Channel Algorithm Heap Object Reference: If the Security Policy List field is set to 1h, then this field indicates the location and size of a heap object containing a list of secure channel algorithms. The list is an array of bytes and the values are defined in the Security Type (SECTYPE) field in the Transport Specific Address Subtype Definition in the NVMe TCP Transport Specification. If the Security Policy List field is cleared to 0h, then this field is reserved. ``auth_proto_obj`` Authentication Protocols Heap Object Reference: If the Authentication Policy List field is set to 1h, then this field indicates the location and size of a heap object containing a list of authentication protocol identifiers. If the Authentication Policy List field is cleared to 0h, then this field is reserved. ``cipher_suite_obj`` Cipher Suite Offset Heap Object Reference: If the Cipher Suites Restricted by Policy bit is set to 1h, then this field indicates the location and size of a heap object containing a list of cipher suite identifiers. The list, if any, is an array of bytes and the values are defined in the IANA TLS Parameters Registry. If the Cipher Suites Restricted by Policy bit is cleared to 0h, then this field is reserved. ``dh_grp_obj`` DH Groups Heap Object Reference: If the Authentication DH Groups Restricted by Policy List bit is set to 1h, then this field indicates the location and size of a heap object containing a list of DH-HMAC-CHAP Diffie-Hellman (DH) group identifiers. If the Authentication DH Groups Restricted by Policy List bit is cleared to 0h, then this field is reserved. ``sec_hash_func_obj`` Secure Hash Functions Offset Heap Object Reference: If the Secure Hash Functions Policy List bit is set to 1h, then this field indicates the offset in bytes of a heap object containing a list of DH-HMAC-CHAP hash function identifiers. The list is an array of bytes and the values are defined in the NVM Express Base Specification. If the Secure Hash Functions Policy List bit is cleared to 0h, then this field is reserved. ``sec_keypath_obj`` Secret Keypath Offset Heap Object Reference: if this field is set to a non-zero value, then this field indicates the location and size of a heap object containing a URI. The type of the URI is specified in the Secret Type field. If this field is cleared to 0h, then this field is reserved. ``reserved2`` Reserved. .. c:enum:: nbft_security_flags Security Profile Descriptor Flags (Figure 22) **Constants** ``NBFT_SECURITY_VALID`` Descriptor Valid: If set to 1h, then this descriptor is valid. If cleared to 0h, then this descriptor is not valid. ``NBFT_SECURITY_IN_BAND_AUTH_MASK`` Mask to get the In-Band Authentication Required field. ``NBFT_SECURITY_IN_BAND_AUTH_NOT_SUPPORTED`` In-band authentication is not supported by the NVM subsystem. ``NBFT_SECURITY_IN_BAND_AUTH_NOT_REQUIRED`` In-band authentication is supported by the NVM subsystem and is not required. ``NBFT_SECURITY_IN_BAND_AUTH_REQUIRED`` In-band authentication is supported by the NVM subsystem and is required. ``NBFT_SECURITY_AUTH_POLICY_LIST_MASK`` Mask to get the Authentication Policy List flag: This field indicates whether authentication protocols were indicated by policy from driver defaults or administrative configuration. ``NBFT_SECURITY_AUTH_POLICY_LIST_NOT_SUPPORTED`` Authentication Protocols Heap Object Reference field Offset and Length are reserved. ``NBFT_SECURITY_AUTH_POLICY_LIST_DRIVER`` Authentication Protocols Offset field and the Authentication Protocols Length field indicate a list of authentication protocols used by the driver. ``NBFT_SECURITY_AUTH_POLICY_LIST_ADMIN`` Authentication Protocols Offset field and the Authentication Protocols Length field indicate a list of authentication protocols that were administratively set and used by the driver. ``NBFT_SECURITY_SEC_CHAN_NEG_MASK`` Mask to get the Secure Channel Negotiation Required flag: This field indicates whether secure channel negotiation (e.g. TLS) is required. ``NBFT_SECURITY_SEC_CHAN_NEG_NOT_SUPPORTED`` Secure channel negotiation is not supported by the NVM subsystem. ``NBFT_SECURITY_SEC_CHAN_NEG_NOT_REQUIRED`` Secure channel negotiation is supported by the NVM subsystem and is not required. ``NBFT_SECURITY_SEC_CHAN_NEG_REQUIRED`` Secure channel negotiation is supported by the NVM subsystem and is required. ``NBFT_SECURITY_SEC_POLICY_LIST_MASK`` Mask to get the Security Policy List flag: This field indicates whether secure channel protocols were indicated by policy from driver defaults or administrative configuration. ``NBFT_SECURITY_SEC_POLICY_LIST_NOT_SUPPORTED`` The Offset field and Length field in the Secure Channel Algorithm Heap Object Reference field are reserved. ``NBFT_SECURITY_SEC_POLICY_LIST_DRIVER`` The Heap Object specified by the Secure Channel Algorithm Heap Object Reference field indicates a list of authentication protocols used by the driver. ``NBFT_SECURITY_SEC_POLICY_LIST_ADMIN`` The Heap Object specified by the Secure Channel Algorithm Heap Object Reference field indicates a list of authentication protocols that were administratively set and used by the driver. ``NBFT_SECURITY_CIPHER_RESTRICTED`` Cipher Suites Restricted by Policy: If set to 1h, then the Cipher Suite Offset field and the Ciper Suite Length field indicate a list of supported cipher suites by the driver. If cleared to 0h, then the Cipher Suite Offset field and the Cipher Suite Length field are reserved. ``NBFT_SECURITY_AUTH_DH_GROUPS_RESTRICTED`` Authentication DH Groups Restricted by Policy List: If set to 1h, then connections shall use one of the authentication DH groups in the Authentication DH Groups List is required. If cleared to 0h, then no Authentication DH Groups List is indicated and use of an authentication DH Group is not required. ``NBFT_SECURITY_SEC_HASH_FUNC_POLICY_LIST`` Secure Hash Functions Policy List: If set to 1h, then connections shall use one of the secure hash functions in the Secure Hash Functions Policy List is required. If cleared to 0h, then no Secure Hash Functions Policy List is indicated and use of a secure hash function is not required. .. c:enum:: nbft_security_secret_type Security Profile Descriptor Secret Type **Constants** ``NBFT_SECURITY_SECRET_REDFISH_HOST_IFACE_URI`` Redfish Host Interface URI: If set to 1h, then the Secret Keypath Object Reference is a URI pointing to a Redfish Key Collection Object that contains the PSK. .. c:struct:: nbft_discovery Discovery Descriptor (Figure 24) **Definition** :: struct nbft_discovery { __u8 structure_id; __u8 flags; __u8 index; __u8 hfi_index; __u8 sec_index; __u8 reserved1; struct nbft_heap_obj discovery_ctrl_addr_obj; struct nbft_heap_obj discovery_ctrl_nqn_obj; __u8 reserved2[14]; }; **Members** ``structure_id`` Structure ID: This field shall be set to 6h (i.e., Discovery Descriptor; #NBFT_DESC_DISCOVERY). ``flags`` Discovery Descriptor Flags, see :c:type:`enum nbft_discovery_flags `. ``index`` Discovery Descriptor Index: This field indicates the number of this Discovery Descriptor in the Discovery Descriptor List. ``hfi_index`` HFI Descriptor Index: This field indicates the value of the HFI Descriptor Index field of the HFI Descriptor associated with this Discovery Descriptor. If multiple HFIs share a common Discovery controller, there shall be multiple Discovery Descriptor entries with one per HFI. ``sec_index`` Security Profile Descriptor Index: This field indicates the value of the Security Profile Descriptor Index field of the Security Descriptor associated with this Discovery Descriptor. ``reserved1`` Reserved. ``discovery_ctrl_addr_obj`` Discovery Controller Address Heap Object Reference: This field indicates the location and size of a heap object containing a URI which indicates an NVMe Discovery controller associated with this Discovery Descriptor. If this field is cleared to 0h, then no URI is specified. ``discovery_ctrl_nqn_obj`` Discovery Controller NQN Heap Object Reference: If set to a non-zero value, this field indicates the location and size of a heap object containing an NVMe Discovery controller NQN. If the NVMe Discovery controller referenced by this record requires secure authentication with a well known Subsystem NQN, this field indicates the unique NQN for that NVMe Discovery controller. This record is involved formatted as an NQN string. If this field is cleared to 0h, then this field is reserved and the OS shall use the well known discovery NQN for this record. ``reserved2`` Reserved. .. c:enum:: nbft_discovery_flags Discovery Descriptor Flags **Constants** ``NBFT_DISCOVERY_VALID`` Descriptor Valid: if set to 1h, then this descriptor is valid. If cleared to 0h, then this descriptor is reserved. .. c:enum:: nbft_info_primary_admin_host_flag Primary Administrative Host Descriptor Flags **Constants** ``NBFT_INFO_PRIMARY_ADMIN_HOST_FLAG_NOT_INDICATED`` Not Indicated by Driver: The driver that created this NBFT provided no administrative priority hint for this NBFT. ``NBFT_INFO_PRIMARY_ADMIN_HOST_FLAG_UNSELECTED`` Unselected: The driver that created this NBFT explicitly indicated that this NBFT should not be prioritized over any other NBFT. ``NBFT_INFO_PRIMARY_ADMIN_HOST_FLAG_SELECTED`` Selected: The driver that created this NBFT explicitly indicated that this NBFT should be prioritized over any other NBFT. ``NBFT_INFO_PRIMARY_ADMIN_HOST_FLAG_RESERVED`` Reserved. .. c:struct:: nbft_info_host Host Descriptor **Definition** :: struct nbft_info_host { unsigned char *id; char *nqn; bool host_id_configured; bool host_nqn_configured; enum nbft_info_primary_admin_host_flag primary; }; **Members** ``id`` Host ID (raw UUID, length = 16 bytes). ``nqn`` Host NQN. ``host_id_configured`` HostID Configured Flag: value of True indicates that **id** contains administratively-configured value, or driver default value if False. ``host_nqn_configured`` Host NQN Configured Flag: value of True indicates that **nqn** contains administratively-configured value, or driver default value if False. ``primary`` Primary Administrative Host Descriptor, see :c:type:`enum nbft_info_primary_admin_host_flag `. .. c:struct:: nbft_info_hfi_info_tcp HFI Transport Info Descriptor - NVMe/TCP **Definition** :: struct nbft_info_hfi_info_tcp { __u32 pci_sbdf; __u8 mac_addr[6]; __u16 vlan; __u8 ip_origin; char ipaddr[40]; __u8 subnet_mask_prefix; char gateway_ipaddr[40]; __u16 route_metric; char primary_dns_ipaddr[40]; char secondary_dns_ipaddr[40]; char dhcp_server_ipaddr[40]; char *host_name; bool this_hfi_is_default_route; bool dhcp_override; }; **Members** ``pci_sbdf`` PCI Express Routing ID for the HFI Transport Function. ``mac_addr`` MAC Address: The MAC address of this HFI, in EUI-48TM format. ``vlan`` The VLAN identifier if the VLAN is associated with this HFI, as defined in IEEE 802.1q-2018 or zeroes if no VLAN is associated with this HFI. ``ip_origin`` The source of Ethernet L3 configuration information used by the driver or 0 if not used. ``ipaddr`` The IPv4 or IPv6 address of this HFI. ``subnet_mask_prefix`` The IPv4 or IPv6 subnet mask in CIDR routing prefix notation. ``gateway_ipaddr`` The IPv4 or IPv6 address of the IP gateway for this HFI or zeroes if no IP gateway is specified. ``route_metric`` The cost value for the route indicated by this HFI. ``primary_dns_ipaddr`` The IPv4 or IPv6 address of the Primary DNS server for this HFI. ``secondary_dns_ipaddr`` The IPv4 or IPv6 address of the Secondary DNS server for this HFI. ``dhcp_server_ipaddr`` The IPv4 or IPv6 address of the DHCP server used to assign this HFI address. ``host_name`` The Host Name string. ``this_hfi_is_default_route`` If True, then the BIOS utilized this interface described by HFI to be the default route with highest priority. If False, then routes are local to their own scope. ``dhcp_override`` If True, then HFI information was populated by consuming the DHCP on this interface. If False, then the HFI information was set administratively by a configuration interface to the driver and pre-OS envrionment. .. c:struct:: nbft_info_hfi Host Fabric Interface (HFI) Descriptor **Definition** :: struct nbft_info_hfi { int index; char transport[8]; struct nbft_info_hfi_info_tcp tcp_info; }; **Members** ``index`` HFI Descriptor Index: indicates the number of this HFI Descriptor in the Host Fabric Interface Descriptor List. ``transport`` Transport Type string (e.g. 'tcp'). ``tcp_info`` The HFI Transport Info Descriptor, see :c:type:`struct nbft_info_hfi_info_tcp `. .. c:struct:: nbft_info_discovery Discovery Descriptor **Definition** :: struct nbft_info_discovery { int index; struct nbft_info_security *security; struct nbft_info_hfi *hfi; char *uri; char *nqn; }; **Members** ``index`` The number of this Discovery Descriptor in the Discovery Descriptor List. ``security`` The Security Profile Descriptor, see :c:type:`struct nbft_info_security `. ``hfi`` The HFI Descriptor associated with this Discovery Descriptor. See :c:type:`struct nbft_info_hfi `. ``uri`` A URI which indicates an NVMe Discovery controller associated with this Discovery Descriptor. ``nqn`` An NVMe Discovery controller NQN. .. c:struct:: nbft_info_security Security Profile Descriptor **Definition** :: struct nbft_info_security { int index; }; **Members** ``index`` The number of this Security Profile Descriptor in the Security Profile Descriptor List. .. c:enum:: nbft_info_nid_type Namespace Identifier Type (NIDT) **Constants** ``NBFT_INFO_NID_TYPE_NONE`` No identifier available. ``NBFT_INFO_NID_TYPE_EUI64`` The EUI-64 identifier. ``NBFT_INFO_NID_TYPE_NGUID`` The NSGUID identifier. ``NBFT_INFO_NID_TYPE_NS_UUID`` The UUID identifier. .. c:struct:: nbft_info_subsystem_ns Subsystem Namespace (SSNS) info **Definition** :: struct nbft_info_subsystem_ns { int index; struct nbft_info_discovery *discovery; struct nbft_info_security *security; int num_hfis; struct nbft_info_hfi **hfis; char transport[8]; char traddr[40]; char *trsvcid; __u16 subsys_port_id; __u32 nsid; enum nbft_info_nid_type nid_type; __u8 *nid; char *subsys_nqn; bool pdu_header_digest_required; bool data_digest_required; int controller_id; int asqsz; char *dhcp_root_path_string; bool discovered; bool unavailable; }; **Members** ``index`` SSNS Descriptor Index in the descriptor list. ``discovery`` Primary Discovery Controller associated with this SSNS Descriptor. ``security`` Security Profile Descriptor associated with this namespace. ``num_hfis`` Number of HFIs. ``hfis`` List of HFIs associated with this namespace. Includes the primary HFI at the first position and all secondary HFIs. This array is null-terminated. ``transport`` Transport Type string (e.g. 'tcp'). ``traddr`` Subsystem Transport Address. ``trsvcid`` Subsystem Transport Service Identifier. ``subsys_port_id`` The Subsystem Port ID. ``nsid`` The Namespace ID of this descriptor or when **nid** should be used instead. ``nid_type`` Namespace Identifier Type, see :c:type:`enum nbft_info_nid_type `. ``nid`` The Namespace Identifier value. ``subsys_nqn`` Subsystem and Namespace NQN. ``pdu_header_digest_required`` PDU Header Digest (HDGST) Flag: the use of NVM Header Digest Enabled is required. ``data_digest_required`` Data Digest (DDGST) Flag: the use of NVM Data Digest Enabled is required. ``controller_id`` Controller ID (SSNS Extended Information Descriptor): The controller ID associated with the Admin Queue or 0 if not supported. ``asqsz`` Admin Submission Queue Size (SSNS Extended Information Descriptor) or 0 if not supported. ``dhcp_root_path_string`` DHCP Root Path Override string (SSNS Extended Information Descriptor). ``discovered`` Indicates that this namespace was acquired through discovery. ``unavailable`` Namespace is unavailable as indicated by the pre-OS driver. .. c:struct:: nbft_info The parsed NBFT table data. **Definition** :: struct nbft_info { char *filename; __u8 *raw_nbft; ssize_t raw_nbft_size; struct nbft_info_host host; struct nbft_info_hfi **hfi_list; struct nbft_info_security **security_list; struct nbft_info_discovery **discovery_list; struct nbft_info_subsystem_ns **subsystem_ns_list; }; **Members** ``filename`` Path to the NBFT table. ``raw_nbft`` The original NBFT table contents. ``raw_nbft_size`` Size of **raw_nbft**. ``host`` The Host Descriptor (should match other NBFTs). ``hfi_list`` The HFI Descriptor List (null-terminated array). ``security_list`` The Security Profile Descriptor List (null-terminated array). ``discovery_list`` The Discovery Descriptor List (null-terminated array). ``subsystem_ns_list`` The SSNS Descriptor List (null-terminated array). .. c:function:: int nvme_nbft_read (struct nbft_info **nbft, const char *filename) Read and parse contents of an ACPI NBFT table **Parameters** ``struct nbft_info **nbft`` Parsed NBFT table data. ``const char *filename`` Filename of the raw NBFT table to read. **Description** Read and parse the specified NBFT file into a struct nbft_info. Free with nvme_nbft_free(). **Return** 0 on success, errno otherwise. .. c:function:: void nvme_nbft_free (struct nbft_info *nbft) Free the struct nbft_info and its contents **Parameters** ``struct nbft_info *nbft`` Parsed NBFT table data.