.. _nvme-types-nbft.h - NVMe Boot Firmware Table (NBFT) type definitions:

**nvme-types-nbft.h - NVMe Boot Firmware Table (NBFT) type definitions**


This file defines the ACPI table structures for the NVMe Boot Specification.
These types describe the NVMe Boot Firmware Table (NBFT) used for pre-OS
boot configuration and discovery of NVMe-oF boot devices.

Scope
=====
- ACPI NBFT table structures
- Boot device discovery descriptors
- Host Fabric Interface (HFI) configuration
- Subsystem/Namespace boot information
- Security descriptors for boot
- Discovery service descriptors

This file is part of the nvme-types-*.h family following the established
naming pattern for NVMe specification type definitions.



.. c:enum:: nbft_desc_type

   NBFT Elements - Descriptor Types (Figure 6)

**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.

``NBFT_DESC_HFI_EXT_INFO``
  HFI Extended Info Descriptor: indicated by an HFI Transport
  Info descriptor (since rev. 1.1).




.. c:enum:: nbft_trtype

   NBFT Interface Transport Types (Figure 8)

**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 9)

**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 9)

**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 <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 <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 <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 <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 <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 <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 <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 10)

**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 <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 <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 12)

**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 <nbft_hfi_flags>`.

``trtype``
  HFI Transport Type, see :c:type:`enum nbft_trtype <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 14)

**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;
    struct nbft_heap_obj hfi_ext_info_obj;
    __u8 pcie_seg_num;
    __u8 reserved2[11];
  };

**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 <nbft_trtype>`: This field
  shall be set to 03h (i.e., NVMe/TCP; #NBFT_TRTYPE_TCP).

``trinfo_version``
  Transport Info Version: This field shall be set to 2h,
  supported values include 1h (Boot Spec rev. 1.0).

``hfi_index``
  HFI Descriptor Index: The value of the HFI Descriptor Index
  field of the HFI Descriptor (see :c:type:`struct nbft_hfi <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 <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.

``hfi_ext_info_obj``
  HFI Transport Info Extended Information Descriptor Object
  Reference (since rev. 1.1): 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
  Extended Information Descriptor (see :c:type:`struct nbft_hfi_info_ext <nbft_hfi_info_ext>`).

``pcie_seg_num``
  PCIe Segment Number (since rev. 1.1): The Segment
  Number for the specified Controller when the PCI Express Link
  is in Flit mode. If the PCI Express interface is not in Flit
  mode, or if the pre-OS driver does not support Flit mode,
  then this field should be cleared to 0h.

``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.

``NBFT_HFI_INFO_TCP_IPADDR_AUTOCONF``
  Interface Address Autoconfigured (since rev.
  1.1): if set to 1h, then the IP Address,
  Subnet Mask Prefix, and IP Gateway fields are
  populated by an advanced stateless mechanism
  (e.g., IPv6-SLAAC or IPv6-ND); in addition,
  the DHCP Override bit shall be cleared to 0h,
  and the IP Origin field shall be cleared to 0h.
  If cleared to 0h, then the HFI information
  was not set by such a mechanism.




.. c:struct:: nbft_hfi_info_ext

   HFI Transport Info Extended Information Descriptor (Figure 15, since rev. 1.1)

**Definition**

::

  struct nbft_hfi_info_ext {
    __u8 structure_id;
    __u8 version;
    __le16 hfi_trinfo_index;
    __le32 flags;
    struct nbft_heap_obj dhcp_iaid_obj;
    struct nbft_heap_obj dhcp_duid_obj;
  };

**Members**

``structure_id``
  Structure ID: This field shall be set to Ah
  (i.e., HFI Ext Info; #NBFT_DESC_HFI_EXT_INFO).

``version``
  Version: This field shall be set to 1h.

``hfi_trinfo_index``
  HFI Transport Info Descriptor Index: This field shall
  be set to the same value as the HFI Transport Info
  Descriptor Index field of the referencing HFI Transport
  Info Descriptor.

``flags``
  Flags, see :c:type:`enum nbft_hfi_info_ext_flags <nbft_hfi_info_ext_flags>`.

``dhcp_iaid_obj``
  IPv4 and IPv6 DHCP Client Identifier Heap IAID Object
  Reference: If the DHCP Client Identifier bit is set to 1h,
  then this heap object references the Identity Association
  Identifier (IAID). This identifier shall be constructed
  conformant to RFC4361. The IAID is stored in little endian
  format within the heap object.

``dhcp_duid_obj``
  IPv4 and IPv6 DHCP Client Identifier Heap DUID Object
  Reference: If the DHCP Client Identifier bit is set to 1h,
  then this heap object references the DHCP Unique Identifier
  (DUID). This identifier shall be constructed conformant
  to RFC4361. The DUID is stored in little endian format
  within the heap object.





.. c:enum:: nbft_hfi_info_ext_flags

   HFI Transport Info Extended Information Descriptor Flags (since rev. 1.1)

**Constants**

``NBFT_HFI_INFO_EXT_VALID``
  Descriptor Valid: If set to 1h, then this
  descriptor is valid. If cleared to 0h, then
  this descriptor is reserved.

``NBFT_HFI_INFO_EXT_DCI``
  DHCP Client Identifier: If set to 1h, then the
  IPv4 and IPv6 DHCP Client Identifier Heap Object
  Reference fields are valid and the IP Origin field
  shall be set to 3h. If cleared to 0h, then the
  DHCP Client Identifier Heap Object References
  are reserved.




.. c:struct:: nbft_ssns

   Subsystem Namespace (SSNS) Descriptor (Figure 17)

**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 <nbft_ssns_flags>`.

``trtype``
  Transport Type, see :c:type:`enum nbft_trtype <nbft_trtype>`.

``trflags``
  Transport Specific Flags, see :c:type:`enum nbft_ssns_trflags <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 <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 <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 <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 <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 <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 18)

**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 19)

**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 21)

**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;
    __u8 naed;
    __u8 cipeec;
    __le16 cto;
    __u8 nceec;
  };

**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 <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 <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.

``naed``
  Namespace Availability Enhanced Diagnostic (since
  rev. 1.1): If the Unavailable Namespace Flag bit
  is set to 1h (i.e., Unavailable) in the Subsystem
  Namespace Descriptor, this field may provide additional
  status codes provided by the pre-OS driver,
  see :c:type:`enum nbft_ssns_ext_info_naed <nbft_ssns_ext_info_naed>`.

``cipeec``
  Connect Invalid Parameters Extended Error Codes (since
  rev, 1.1): Connect Invalid Parameters may be returned
  with additional status details,
  see :c:type:`enum nbft_ssns_ext_info_cipeec <nbft_ssns_ext_info_cipeec>`.

``cto``
  Connection Timeout (since rev. 1.1): Specifies
  in seconds the timeout value used by the pre-OS driver
  for connecting to the object specified with this SSNS
  descriptor. If cleared to 0h, this indicates a timeout
  of 0 seconds. If set to FFFFh, this indicates that no
  timeout was specified.

``nceec``
  Network and Connection Extended Error Codes (since
  rev, 1.1): Error codes specific to network and connectio
  errors, see :c:type:`enum nbft_ssns_ext_info_nceec <nbft_ssns_ext_info_nceec>`.





.. c:enum:: nbft_ssns_ext_info_naed

   SSNS Extended Info Namespace Availability Enhanced Diagnostic values (since rev. 1.1)

**Constants**

``NBFT_SSNS_EXT_INFO_NAED_NO_INFO``
  No additional information.

``NBFT_SSNS_EXT_INFO_NAED_NETWORK_ERR``
  Network Error: The network HFI or
  SSNS destination was invalid.

``NBFT_SSNS_EXT_INFO_NAED_CONN_FAILURE``
  Connection Failure: The connection
  to the controller was invalid.

``NBFT_SSNS_EXT_INFO_NAED_CONN_INV_PARAMS``
  Connect Invalid Parameters.

``NBFT_SSNS_EXT_INFO_NAED_CONN_INV_HOST``
  Connect Invalid Host.

``NBFT_SSNS_EXT_INFO_NAED_CONN_TIMEOUT``
  Connection Timeout.

``NBFT_SSNS_EXT_INFO_NAED_DLP_TIMEOUT``
  Discovery Log Page Traversal Timeout.

``NBFT_SSNS_EXT_INFO_NAED_NS_MISSING``
  Namespace Missing: The referenced
  NID or NSID is missing.

``NBFT_SSNS_EXT_INFO_NAED_NS_NOT_READY``
  Namespace Not Ready.

``NBFT_SSNS_EXT_INFO_NAED_REDFISH_FAILURE``
  Redfish Secret Keypath Object: The
  pre-OS driver encountered a failure
  interacting with the Redfish Secret
  Keypath Object.

``NBFT_SSNS_EXT_INFO_NAED_SEC_CHAN_NEG``
  Secure Channel Negotiation error.

``NBFT_SSNS_EXT_INFO_NAED_AUTH_FAILURE``
  Authentication Failure.

``NBFT_SSNS_EXT_INFO_NAED_AUTH_REQUIRED``
  Authentication Required.

``NBFT_SSNS_EXT_INFO_NAED_DHCP_FAILURE``
  DHCP Failure.

``NBFT_SSNS_EXT_INFO_NAED_DHCP_ROOT_PATH``
  SSNS DHCP Root-Path.




.. c:enum:: nbft_ssns_ext_info_cipeec

   Connect Invalid Parameters Extended Error Codes (since rev. 1.1)

**Constants**

``NBFT_SSNS_EXT_INFO_CIPEEC_NO_ERROR``
  No Extended Error Known.

``NBFT_SSNS_EXT_INFO_CIPEEC_GENERAL``
  General Parameters Failure.

``NBFT_SSNS_EXT_INFO_CIPEEC_INV_ATTR``
  Invalid Attributes in Connect Response.

``NBFT_SSNS_EXT_INFO_CIPEEC_DH_MISMATCH``
  Diffie-Hellman Mismatch.

``NBFT_SSNS_EXT_INFO_CIPEEC_INV_CTRLID``
  Invalid Controller ID.

``NBFT_SSNS_EXT_INFO_CIPEEC_IO_CTRL_DIS``
  I/O Controller Disabled.




.. c:enum:: nbft_ssns_ext_info_nceec

   Network and Connection Extended Error Codes (since rev. 1.1)

**Constants**

``NBFT_SSNS_EXT_INFO_NCEEC_NO_ERROR``
  No Extended Error Known.

``NBFT_SSNS_EXT_INFO_NCEEC_LINK_ERR``
  Link Error.

``NBFT_SSNS_EXT_INFO_NCEEC_CARRIER_ERR``
  Carrier Error.

``NBFT_SSNS_EXT_INFO_NCEEC_CONN_REFUSED``
  Connection Refused.

``NBFT_SSNS_EXT_INFO_NCEEC_NO_ROUTE``
  No Route to Host.

``NBFT_SSNS_EXT_INFO_NCEEC_FRAG_ERR``
  Packet Fragmentation Error.

``NBFT_SSNS_EXT_INFO_NCEEC_MTU_MISMATCH``
  MTU Mismatch.

``NBFT_SSNS_EXT_INFO_NCEEC_NAME_RES``
  Name Resolution Failure.




.. 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 23)

**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 <nbft_security_flags>`.

``secret_type``
  Secret Type, see :c:type:`enum nbft_security_secret_type <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 24)

**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 26)

**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 <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.


