.. _mi.h - NVMe Management Interface library (libnvme-mi) definitions.:

**mi.h - NVMe Management Interface library (libnvme-mi) definitions.**


These provide an abstraction for the MI messaging between controllers
and a host, typically over an MCTP-over-i2c link to a NVMe device, used
as part of the out-of-band management of a system.

We have a few data structures define here to reflect the topology
of a MI connection with an NVMe subsystem:

 - :c:type:`nvme_mi_ep_t`: an MI endpoint - our mechanism of communication with a
   NVMe subsystem. For MCTP, an endpoint will be the component that
   holds the MCTP address (EID), and receives our request message.

   endpoints are defined in the NVMe-MI spec, and are specific to the MI
   interface.

   Each endpoint will provide access to one or more of:

 - :c:type:`nvme_mi_ctrl_t`: a NVMe controller, as defined by the NVMe base spec.
   The controllers are responsible for processing any NVMe standard
   commands (eg, the Admin command set). An endpoint (:c:type:`nvme_mi_ep_t`)
   may provide access to multiple controllers - so each of the controller-
   type commands will require a :c:type:`nvme_mi_ctrl_t` to be specified, rather than
   an endpoint

A couple of conventions with the libnvme-mi API:

 - All types and functions have the nvme_mi prefix, to distinguish from
   the libnvme core.

 - We currently support either MI commands and Admin commands. The
   former adds a _mi prefix, the latter an _admin prefix. [This does
   result in the MI functions having a double _mi, like
   :c:type:`nvme_mi_mi_subsystem_health_status_poll`, which is apparently amusing
   for our German-speaking readers]

For return values: unless specified in the per-function documentation,
all functions:

 - return 0 on success

 - return -1, with errno set, for errors communicating with the MI device,
   either in request or response data

 - return >1 on MI status errors. This value is the 8-bit MI status
   value, represented by :c:type:`enum nvme_mi_resp_status <nvme_mi_resp_status>`. Note that the
   status values may be vendor-defined above 0xe0.

For the second case, we have a few conventions for errno values:

 - EPROTO: response data violated the MI protocol, and libnvme cannot
   validly interpret the response

 - EIO: Other I/O error communicating with device (eg., valid but
   unexpected response data)

 - EINVAL: invalid input arguments for a command

In line with the core NVMe API, the Admin command functions take an
`_args` structure to provide the command-specific parameters. However,
for the MI interface, the fd and timeout members of these _args structs
are ignored.

References to the specifications here will either to be the NVM Express
Management Interface ("NVMe-MI") or the NVM Express Base specification
("NVMe"). At the time of writing, the versions we're referencing here
are:
 - NVMe-MI 1.2b
 - NVMe 2.0b
with a couple of accommodations for older spec types, particularly NVMe-MI
1.1, where possible.

.. c:macro:: NVME_MI_MSGTYPE_NVME

``NVME_MI_MSGTYPE_NVME ()``

   MCTP message type for NVMe-MI messages.

**Parameters**

**Description**


This is defined by MCTP, but is referenced as part of the NVMe-MI message
spec. This is the MCTP NVMe message type (0x4), with the message-integrity
bit (0x80) set.




.. c:enum:: nvme_mi_message_type

   NVMe-MI message type field.

**Constants**

``NVME_MI_MT_CONTROL``
  NVME-MI Control Primitive

``NVME_MI_MT_MI``
  NVMe-MI command

``NVME_MI_MT_ADMIN``
  NVMe Admin command

``NVME_MI_MT_PCIE``
  PCIe command

**Description**

Used as byte 1 of both request and response messages (NMIMT bits of NMP
byte). Not to be confused with the MCTP message type in byte 0.




.. c:enum:: nvme_mi_ror

   Request or response field.

**Constants**

``NVME_MI_ROR_REQ``
  request message

``NVME_MI_ROR_RSP``
  response message




.. c:enum:: nvme_mi_resp_status

   values for the response status field

**Constants**

``NVME_MI_RESP_SUCCESS``
  success

``NVME_MI_RESP_MPR``
  More Processing Required

``NVME_MI_RESP_INTERNAL_ERR``
  Internal Error

``NVME_MI_RESP_INVALID_OPCODE``
  Invalid command opcode

``NVME_MI_RESP_INVALID_PARAM``
  Invalid command parameter

``NVME_MI_RESP_INVALID_CMD_SIZE``
  Invalid command size

``NVME_MI_RESP_INVALID_INPUT_SIZE``
  Invalid command input data size

``NVME_MI_RESP_ACCESS_DENIED``
  Access Denied

``NVME_MI_RESP_VPD_UPDATES_EXCEEDED``
  More VPD updates than allowed

``NVME_MI_RESP_PCIE_INACCESSIBLE``
  PCIe functionality currently unavailable

``NVME_MI_RESP_MEB_SANITIZED``
  MEB has been cleared due to sanitize

``NVME_MI_RESP_ENC_SERV_FAILURE``
  Enclosure services process failed

``NVME_MI_RESP_ENC_SERV_XFER_FAILURE``
  Transfer with enclosure services failed

``NVME_MI_RESP_ENC_FAILURE``
  Unreoverable enclosure failure

``NVME_MI_RESP_ENC_XFER_REFUSED``
  Enclosure services transfer refused

``NVME_MI_RESP_ENC_FUNC_UNSUP``
  Unsupported enclosure services function

``NVME_MI_RESP_ENC_SERV_UNAVAIL``
  Enclosure services unavailable

``NVME_MI_RESP_ENC_DEGRADED``
  Noncritical failure detected by enc. services

``NVME_MI_RESP_SANITIZE_IN_PROGRESS``
  Command prohibited during sanitize




.. c:struct:: nvme_mi_msg_hdr

   General MI message header.

**Definition**

::

  struct nvme_mi_msg_hdr {
    __u8 type;
    __u8 nmp;
    __u8 meb;
    __u8 rsvd0;
  };

**Members**

``type``
  MCTP message type, will always be NVME_MI_MSGTYPE_NVME

``nmp``
  NVMe-MI message parameters (including MI message type)

``meb``
  Management Endpoint Buffer flag; unused for libnvme-mi implementation

``rsvd0``
  currently reserved


**Description**

Wire format shared by both request and response messages, per NVMe-MI
section 3.1. This is used for all message types, MI and Admin.




.. c:struct:: nvme_mi_msg_resp

   Generic response type.

**Definition**

::

  struct nvme_mi_msg_resp {
    struct nvme_mi_msg_hdr hdr;
    __u8 status;
    __u8 rsvd0[3];
  };

**Members**

``hdr``
  the general request/response message header

``status``
  response status value (see :c:type:`enum nvme_mi_resp_status <nvme_mi_resp_status>`)

``rsvd0``
  reserved data, may be defined by specific response


**Description**

Every response will start with one of these; command-specific responses
will define parts of the reserved data, and may add further fields.




.. c:enum:: nvme_mi_mi_opcode

   Operation code for supported NVMe-MI commands.

**Constants**

``nvme_mi_mi_opcode_mi_data_read``
  Read NVMe-MI Data Structure

``nvme_mi_mi_opcode_subsys_health_status_poll``
  Subsystem Health Status Poll

``nvme_mi_mi_opcode_configuration_set``
  MI Configuration Set

``nvme_mi_mi_opcode_configuration_get``
  MI Configuration Get




.. c:struct:: nvme_mi_mi_req_hdr

   MI request message header.

**Definition**

::

  struct nvme_mi_mi_req_hdr {
    struct nvme_mi_msg_hdr hdr;
    __u8 opcode;
    __u8 rsvd0[3];
    __le32 cdw0, cdw1;
  };

**Members**

``hdr``
  generic MI message header

``opcode``
  opcode (OPC) for the specific MI command

``rsvd0``
  reserved bytes

``cdw0``
  Management Request Doubleword 0 - command specific usage

``cdw1``
  Management Request Doubleword 1 - command specific usage


**Description**

Wire format for MI request message headers, defined in section 5 of NVMe-MI.




.. c:struct:: nvme_mi_mi_resp_hdr

   MI response message header.

**Definition**

::

  struct nvme_mi_mi_resp_hdr {
    struct nvme_mi_msg_hdr hdr;
    __u8 status;
    __u8 nmresp[3];
  };

**Members**

``hdr``
  generic MI message header

``status``
  generic response status from command; non-zero on failure.

``nmresp``
  NVMe Management Response: command-type-specific response data


**Description**

Wire format for MI response message header, defined in section 5 of NVMe-MI.




.. c:enum:: nvme_mi_dtyp

   Data Structure Type field.

**Constants**

``nvme_mi_dtyp_subsys_info``
  NVM Subsystem Information

``nvme_mi_dtyp_port_info``
  Port information

``nvme_mi_dtyp_ctrl_list``
  Controller List

``nvme_mi_dtyp_ctrl_info``
  Controller Information

``nvme_mi_dtyp_opt_cmd_support``
  Optionally Supported Command List

``nvme_mi_dtyp_meb_support``
  Management Endpoint Buffer Command Support List

**Description**

Data Structure Type field for Read NVMe-MI Data Structure command, used to
indicate the particular structure to query from the endpoint.




.. c:enum:: nvme_mi_config_id

   NVMe-MI Configuration identifier.

**Constants**

``NVME_MI_CONFIG_SMBUS_FREQ``
  Current SMBus/I2C frequency

``NVME_MI_CONFIG_HEALTH_STATUS_CHANGE``
  Health Status change - used to clear
  health status bits in CCS bits of
  status poll. Only for Set ops.

``NVME_MI_CONFIG_MCTP_MTU``
  MCTP maximum transmission unit size of port
  specified in dw 0

**Description**

Configuration parameters for the MI Get/Set Configuration commands.

See :c:type:`nvme_mi_mi_config_get`() and :c:type:`nvme_mi_config_set`().




.. c:enum:: nvme_mi_config_smbus_freq

   SMBus/I2C frequency values

**Constants**

``NVME_MI_CONFIG_SMBUS_FREQ_100kHz``
  100kHz

``NVME_MI_CONFIG_SMBUS_FREQ_400kHz``
  400kHz

``NVME_MI_CONFIG_SMBUS_FREQ_1MHz``
  1MHz

**Description**

Values used in the SMBus Frequency device configuration. See
:c:type:`nvme_mi_mi_config_get_smbus_freq`() and :c:type:`nvme_mi_mi_config_set_smbus_freq`().




.. c:struct:: nvme_mi_admin_req_hdr

   Admin command request header.

**Definition**

::

  struct nvme_mi_admin_req_hdr {
    struct nvme_mi_msg_hdr hdr;
    __u8 opcode;
    __u8 flags;
    __le16 ctrl_id;
    __le32 cdw1, cdw2, cdw3, cdw4, cdw5;
    __le32 doff;
    __le32 dlen;
    __le32 rsvd0, rsvd1;
    __le32 cdw10, cdw11, cdw12, cdw13, cdw14, cdw15;
  };

**Members**

``hdr``
  Generic MI message header

``opcode``
  Admin command opcode (using enum nvme_admin_opcode)

``flags``
  Command Flags, indicating dlen and doff validity; Only defined in
  NVMe-MI version 1.1, no fields defined in 1.2 (where the dlen/doff
  are always considered valid).

``ctrl_id``
  Controller ID target of command

``cdw1``
  Submission Queue Entry doubleword 1

``cdw2``
  Submission Queue Entry doubleword 2

``cdw3``
  Submission Queue Entry doubleword 3

``cdw4``
  Submission Queue Entry doubleword 4

``cdw5``
  Submission Queue Entry doubleword 5

``doff``
  Offset of data to return from command

``dlen``
  Length of sent/returned data

``rsvd0``
  Reserved

``rsvd1``
  Reserved

``cdw10``
  Submission Queue Entry doubleword 10

``cdw11``
  Submission Queue Entry doubleword 11

``cdw12``
  Submission Queue Entry doubleword 12

``cdw13``
  Submission Queue Entry doubleword 13

``cdw14``
  Submission Queue Entry doubleword 14

``cdw15``
  Submission Queue Entry doubleword 15


**Description**

Wire format for Admin command message headers, defined in section 6 of
NVMe-MI.




.. c:struct:: nvme_mi_admin_resp_hdr

   Admin command response header.

**Definition**

::

  struct nvme_mi_admin_resp_hdr {
    struct nvme_mi_msg_hdr hdr;
    __u8 status;
    __u8 rsvd0[3];
    __le32 cdw0, cdw1, cdw3;
  };

**Members**

``hdr``
  Generic MI message header

``status``
  Generic response code, non-zero on failure

``rsvd0``
  Reserved

``cdw0``
  Completion Queue Entry doubleword 0

``cdw1``
  Completion Queue Entry doubleword 1

``cdw3``
  Completion Queue Entry doubleword 3


**Description**

This is the generic response format with the three doublewords of completion
queue data, plus optional response data.


.. c:function:: const char * nvme_mi_status_to_string (int status)

   return a string representation of the MI status.

**Parameters**

``int status``
  MI response status

**Description**

Gives a string description of **status**, as per section 4.1.2 of the NVMe-MI
spec. The status value should be of type NVME_STATUS_MI, and extracted
from the return value using nvme_status_get_value().

Returned string is const, and should not be free()ed.

**Return**

A string representing the status value


.. c:function:: nvme_root_t nvme_mi_create_root (FILE *fp, int log_level)

   Create top-level MI (root) handle.

**Parameters**

``FILE *fp``
  File descriptor for logging messages

``int log_level``
  Logging level to use

**Description**

Create the top-level (library) handle for creating subsequent endpoint
objects. Similar to nvme_create_root(), but we provide this to allow linking
without the core libnvme.

See :c:type:`nvme_create_root`.

**Return**

new root object, or NULL on failure.


.. c:function:: void nvme_mi_free_root (nvme_root_t root)

   Free root object.

**Parameters**

``nvme_root_t root``
  root to free


.. c:function:: void nvme_mi_set_probe_enabled (nvme_root_t root, bool enabled)

   enable/disable the probe for new endpoints

**Parameters**

``nvme_root_t root``
  :c:type:`nvme_root_t` object

``bool enabled``
  whether to probe new endpoints

**Description**

Controls whether newly-created endpoints are probed for quirks on creation.
Defaults to enabled, which results in some initial messaging with the
endpoint to determine model-specific details.




.. c:type:: nvme_mi_ep_t

   MI Endpoint object.

**Description**


Represents our communication endpoint on the remote MI-capable device.
To be used for direct MI commands for the endpoint (through the
nvme_mi_mi_* functions(), or to communicate with individual controllers
(see :c:type:`nvme_mi_init_ctrl`).

Endpoints are created through a transport-specific constructor; currently
only MCTP-connected endpoints are supported, through :c:type:`nvme_mi_open_mctp`.
Subsequent operations on the endpoint (and related controllers) are
transport-independent.


.. c:function:: nvme_mi_ep_t nvme_mi_first_endpoint (nvme_root_t m)

   Start endpoint iterator

**Parameters**

``nvme_root_t m``
  :c:type:`nvme_root_t` object

**Return**

first MI endpoint object under this root, or NULL if no endpoints
        are present.

**Description**

See: :c:type:`nvme_mi_next_endpoint`, :c:type:`nvme_mi_for_each_endpoint`


.. c:function:: nvme_mi_ep_t nvme_mi_next_endpoint (nvme_root_t m, nvme_mi_ep_t e)

   Continue endpoint iterator

**Parameters**

``nvme_root_t m``
  :c:type:`nvme_root_t` object

``nvme_mi_ep_t e``
  :c:type:`nvme_mi_ep_t` current position of iterator

**Return**

next endpoint MI endpoint object after **e** under this root, or NULL
        if no further endpoints are present.

**Description**

See: :c:type:`nvme_mi_first_endpoint`, :c:type:`nvme_mi_for_each_endpoint`


.. c:macro:: nvme_mi_for_each_endpoint

``nvme_mi_for_each_endpoint (m, e)``

   Iterator for NVMe-MI endpoints.

**Parameters**

``m``
  :c:type:`nvme_root_t` containing endpoints

``e``
  :c:type:`nvme_mi_ep_t` object, set on each iteration


.. c:macro:: nvme_mi_for_each_endpoint_safe

``nvme_mi_for_each_endpoint_safe (m, e, _e)``

   Iterator for NVMe-MI endpoints, allowing deletion during traversal

**Parameters**

``m``
  :c:type:`nvme_root_t` containing endpoints

``e``
  :c:type:`nvme_mi_ep_t` object, set on each iteration

``_e``
  :c:type:`nvme_mi_ep_t` object used as temporary storage


.. c:function:: int nvme_mi_ep_set_timeout (nvme_mi_ep_t ep, unsigned int timeout_ms)

   set a timeout for NVMe-MI responses

**Parameters**

``nvme_mi_ep_t ep``
  MI endpoint object

``unsigned int timeout_ms``
  Timeout for MI responses, given in milliseconds


.. c:function:: void nvme_mi_ep_set_mprt_max (nvme_mi_ep_t ep, unsigned int mprt_max_ms)

   set the maximum wait time for a More Processing Required response

**Parameters**

``nvme_mi_ep_t ep``
  MI endpoint object

``unsigned int mprt_max_ms``
  Maximum more processing required wait time

**Description**

NVMe-MI endpoints may respond to a request with a "More Processing Required"
response; this also includes a hint on the worst-case processing time for
the eventual response data, with a specification-defined maximum of 65.535
seconds.

This function provides a way to limit the maximum time we're prepared to
wait for the final response. Specify zero in **mprt_max_ms** for no limit.
This should be larger than the command/response timeout set in
:c:type:`nvme_mi_ep_set_timeout`().


.. c:function:: unsigned int nvme_mi_ep_get_timeout (nvme_mi_ep_t ep)

   get the current timeout value for NVMe-MI responses

**Parameters**

``nvme_mi_ep_t ep``
  MI endpoint object

**Description**

Returns the current timeout value, in milliseconds, for this endpoint.




.. c:type:: nvme_mi_ctrl_t

   NVMe-MI Controller object.

**Description**


Provides NVMe command functionality, through the MI interface.


.. c:function:: nvme_mi_ctrl_t nvme_mi_first_ctrl (nvme_mi_ep_t ep)

   Start controller iterator

**Parameters**

``nvme_mi_ep_t ep``
  :c:type:`nvme_mi_ep_t` object

**Return**

first MI controller object under this root, or NULL if no controllers
        are present.

**Description**

See: :c:type:`nvme_mi_next_ctrl`, :c:type:`nvme_mi_for_each_ctrl`


.. c:function:: nvme_mi_ctrl_t nvme_mi_next_ctrl (nvme_mi_ep_t ep, nvme_mi_ctrl_t c)

   Continue ctrl iterator

**Parameters**

``nvme_mi_ep_t ep``
  :c:type:`nvme_mi_ep_t` object

``nvme_mi_ctrl_t c``
  :c:type:`nvme_mi_ctrl_t` current position of iterator

**Return**

next MI controller object after **c** under this endpoint, or NULL
        if no further controllers are present.

**Description**

See: :c:type:`nvme_mi_first_ctrl`, :c:type:`nvme_mi_for_each_ctrl`


.. c:macro:: nvme_mi_for_each_ctrl

``nvme_mi_for_each_ctrl (ep, c)``

   Iterator for NVMe-MI controllers.

**Parameters**

``ep``
  :c:type:`nvme_mi_ep_t` containing endpoints

``c``
  :c:type:`nvme_mi_ctrl_t` object, set on each iteration

**Description**

Allows iteration of the list of controllers behind an endpoint. Unless the
controllers have already been created explicitly, you'll probably want to
call :c:type:`nvme_mi_scan_ep`() to scan for the controllers first.

See: :c:type:`nvme_mi_scan_ep`()


.. c:macro:: nvme_mi_for_each_ctrl_safe

``nvme_mi_for_each_ctrl_safe (ep, c, _c)``

   Iterator for NVMe-MI controllers, allowing deletion during traversal

**Parameters**

``ep``
  :c:type:`nvme_mi_ep_t` containing controllers

``c``
  :c:type:`nvme_mi_ctrl_t` object, set on each iteration

``_c``
  :c:type:`nvme_mi_ctrl_t` object used as temporary storage

**Description**

Allows iteration of the list of controllers behind an endpoint, safe against
deletion during iteration. Unless the controllers have already been created
explicitly (or you're just iterating to destroy controllers) you'll probably
want to call :c:type:`nvme_mi_scan_ep`() to scan for the controllers first.

See: :c:type:`nvme_mi_scan_ep`()


.. c:function:: nvme_mi_ep_t nvme_mi_open_mctp (nvme_root_t root, unsigned int netid, uint8_t eid)

   Create an endpoint using a MCTP connection.

**Parameters**

``nvme_root_t root``
  root object to create under

``unsigned int netid``
  MCTP network ID on this system

``uint8_t eid``
  MCTP endpoint ID

**Description**

Transport-specific endpoint initialization for MI-connected endpoints. Once
an endpoint is created, the rest of the API is transport-independent.

See :c:type:`nvme_mi_close`

**Return**

New endpoint object for **netid** & **eid**, or NULL on failure.


.. c:function:: void nvme_mi_close (nvme_mi_ep_t ep)

   Close an endpoint connection and release resources, including controller objects.

**Parameters**

``nvme_mi_ep_t ep``
  Endpoint object to close


.. c:function:: nvme_root_t nvme_mi_scan_mctp (void)

   look for MCTP-connected NVMe-MI endpoints.

**Parameters**

``void``
  no arguments

**Description**

This function queries the system MCTP daemon ("mctpd") over
D-Bus, to find MCTP endpoints that report support for NVMe-MI over MCTP.

This requires libvnme-mi to be compiled with D-Bus support; if not, this
will return NULL.

**Return**

A **nvme_root_t** populated with a set of MCTP-connected endpoints,
        or NULL on failure


.. c:function:: int nvme_mi_scan_ep (nvme_mi_ep_t ep, bool force_rescan)

   query an endpoint for its NVMe controllers.

**Parameters**

``nvme_mi_ep_t ep``
  Endpoint to scan

``bool force_rescan``
  close existing controllers and rescan

**Description**

This function queries an MI endpoint for the controllers available, by
performing an MI Read MI Data Structure command (requesting the
controller list). The controllers are stored in the endpoint's internal
list, and can be iterated with nvme_mi_for_each_ctrl.

This will only scan the endpoint once, unless **force_rescan** is set. If
so, all existing controller objects will be freed - the caller must not
hold a reference to those across this call.

See: :c:type:`nvme_mi_for_each_ctrl`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: nvme_mi_ctrl_t nvme_mi_init_ctrl (nvme_mi_ep_t ep, __u16 ctrl_id)

   initialise a NVMe controller.

**Parameters**

``nvme_mi_ep_t ep``
  Endpoint to create under

``__u16 ctrl_id``
  ID of controller to initialize.

**Description**

Create a connection to a controller behind the endpoint specified in **ep**.
Controller IDs may be queried from the endpoint through
:c:type:`nvme_mi_mi_read_mi_data_ctrl_list`.

See :c:type:`nvme_mi_close_ctrl`

**Return**

New controller object, or NULL on failure.


.. c:function:: void nvme_mi_close_ctrl (nvme_mi_ctrl_t ctrl)

   free a controller

**Parameters**

``nvme_mi_ctrl_t ctrl``
  controller to free


.. c:function:: char * nvme_mi_endpoint_desc (nvme_mi_ep_t ep)

   Get a string describing a MI endpoint.

**Parameters**

``nvme_mi_ep_t ep``
  endpoint to describe

**Description**

Generates a human-readable string describing the endpoint, with possibly
transport-specific data. The string is allocated during the call, and the
caller is responsible for free()-ing the string.

**Return**

a newly-allocated string containing the endpoint description, or
        NULL on failure.


.. c:function:: int nvme_mi_mi_read_mi_data_subsys (nvme_mi_ep_t ep, struct nvme_mi_read_nvm_ss_info *s)

   Perform a Read MI Data Structure command, retrieving subsystem data.

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``struct nvme_mi_read_nvm_ss_info *s``
  subsystem information to populate

**Description**

Retrieves the Subsystem information - number of external ports and
NVMe version information. See :c:type:`struct nvme_mi_read_nvm_ss_info <nvme_mi_read_nvm_ss_info>`.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_mi_read_mi_data_port (nvme_mi_ep_t ep, __u8 portid, struct nvme_mi_read_port_info *p)

   Perform a Read MI Data Structure command, retrieving port data.

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``__u8 portid``
  id of port data to retrieve

``struct nvme_mi_read_port_info *p``
  port information to populate

**Description**

Retrieves the Port information, for the specified port ID. The subsystem
data (from :c:type:`nvme_mi_mi_read_mi_data_subsys`) nmp field contains the allowed
range of port IDs.

See :c:type:`struct nvme_mi_read_port_info <nvme_mi_read_port_info>`.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_mi_read_mi_data_ctrl_list (nvme_mi_ep_t ep, __u8 start_ctrlid, struct nvme_ctrl_list *list)

   Perform a Read MI Data Structure command, retrieving the list of attached controllers.

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``__u8 start_ctrlid``
  starting controller ID

``struct nvme_ctrl_list *list``
  controller list to populate

**Description**

Retrieves the list of attached controllers, with IDs greater than or
equal to **start_ctrlid**.

See :c:type:`struct nvme_ctrl_list <nvme_ctrl_list>`.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_mi_read_mi_data_ctrl (nvme_mi_ep_t ep, __u16 ctrl_id, struct nvme_mi_read_ctrl_info *ctrl)

   Perform a Read MI Data Structure command, retrieving controller information

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``__u16 ctrl_id``
  ID of controller to query

``struct nvme_mi_read_ctrl_info *ctrl``
  controller data to populate

**Description**

Retrieves the Controller Information Data Structure for the attached
controller with ID **ctrlid**.

See :c:type:`struct nvme_mi_read_ctrl_info <nvme_mi_read_ctrl_info>`.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_mi_subsystem_health_status_poll (nvme_mi_ep_t ep, bool clear, struct nvme_mi_nvm_ss_health_status *nshds)

   Read the Subsystem Health Data Structure from the NVM subsystem

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``bool clear``
  flag to clear the Composite Controller Status state

``struct nvme_mi_nvm_ss_health_status *nshds``
  subsystem health status data to populate

**Description**

Retrieves the Subsystem Health Data Structure into **nshds**. If **clear** is
set, requests that the Composite Controller Status bits are cleared after
the read. See NVMe-MI section 5.6 for details on the CCS bits.

See :c:type:`struct nvme_mi_nvm_ss_health_status <nvme_mi_nvm_ss_health_status>`.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_mi_config_get (nvme_mi_ep_t ep, __u32 dw0, __u32 dw1, __u32 *nmresp)

   query a configuration parameter

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``__u32 dw0``
  management doubleword 0, containing configuration identifier, plus
  config-specific fields

``__u32 dw1``
  management doubleword 0, config-specific.

``__u32 *nmresp``
  set to queried configuration data in NMRESP field of response.

**Description**

Performs a MI Configuration Get command, with the configuration identifier
as the LSB of **dw0**. Other **dw0** and **dw1** data is configuration-identifier
specific.

On a successful Configuration Get, the **nmresp** pointer will be populated with
the bytes from the 3-byte NMRESP field, converted to native endian.

See :c:type:`enum nvme_mi_config_id <nvme_mi_config_id>` for identifiers.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_mi_config_set (nvme_mi_ep_t ep, __u32 dw0, __u32 dw1)

   set a configuration parameter

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``__u32 dw0``
  management doubleword 0, containing configuration identifier, plus
  config-specific fields

``__u32 dw1``
  management doubleword 0, config-specific.

**Description**

Performs a MI Configuration Set command, with the command as the LSB of
**dw0**. Other **dw0** and **dw1** data is configuration-identifier specific.

See :c:type:`enum nvme_mi_config_id <nvme_mi_config_id>` for identifiers.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_mi_config_get_smbus_freq (nvme_mi_ep_t ep, __u8 port, enum nvme_mi_config_smbus_freq *freq)

   get configuration: SMBus port frequency

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``__u8 port``
  port ID to query

``enum nvme_mi_config_smbus_freq *freq``
  output value for current frequency configuration

**Description**

Performs a MI Configuration Get, to query the current SMBus frequency of
the port specified in **port**. On success, populates **freq** with the port
frequency

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_mi_config_set_smbus_freq (nvme_mi_ep_t ep, __u8 port, enum nvme_mi_config_smbus_freq freq)

   set configuration: SMBus port frequency

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``__u8 port``
  port ID to set

``enum nvme_mi_config_smbus_freq freq``
  new frequency configuration

**Description**

Performs a MI Configuration Set, to update the current SMBus frequency of
the port specified in **port**.

See :c:type:`struct nvme_mi_read_port_info <nvme_mi_read_port_info>` for the maximum supported SMBus frequency
for the port.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_mi_config_set_health_status_change (nvme_mi_ep_t ep, __u32 mask)

   clear CCS bits in health status

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``__u32 mask``
  bitmask to clear

**Description**

Performs a MI Configuration Set, to update the current health status poll
values of the Composite Controller Status bits. Bits set in **mask** will
be cleared from future health status poll data, and may be re-triggered by
a future health change event.

See :c:type:`nvme_mi_mi_subsystem_health_status_poll`(), :c:type:`enum nvme_mi_ccs <nvme_mi_ccs>` for
values in **mask**.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_mi_config_get_mctp_mtu (nvme_mi_ep_t ep, __u8 port, __u16 *mtu)

   get configuration: MCTP MTU

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``__u8 port``
  port ID to query

``__u16 *mtu``
  output value for current MCTP MTU configuration

**Description**

Performs a MI Configuration Get, to query the current MCTP Maximum
Transmission Unit size (MTU) of the port specified in **port**. On success,
populates **mtu** with the MTU.

The default reset value is 64, corresponding to the MCTP baseline MTU.

Some controllers may also use this as the maximum receive unit size, and
may not accept MCTP messages larger than the configured MTU.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_mi_config_set_mctp_mtu (nvme_mi_ep_t ep, __u8 port, __u16 mtu)

   set configuration: MCTP MTU

**Parameters**

``nvme_mi_ep_t ep``
  endpoint for MI communication

``__u8 port``
  port ID to set

``__u16 mtu``
  new MTU configuration

**Description**

Performs a MI Configuration Set, to update the current MCTP MTU value for
the port specified in **port**.

Some controllers may also use this as the maximum receive unit size, and
may not accept MCTP messages larger than the configured MTU. When setting
this value, you will likely need to change the MTU of the local MCTP
interface(s) to match.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_admin_xfer (nvme_mi_ctrl_t ctrl, struct nvme_mi_admin_req_hdr *admin_req, size_t req_data_size, struct nvme_mi_admin_resp_hdr *admin_resp, off_t resp_data_offset, size_t *resp_data_size)

   Raw admin transfer interface.

**Parameters**

``nvme_mi_ctrl_t ctrl``
  controller to send the admin command to

``struct nvme_mi_admin_req_hdr *admin_req``
  request data

``size_t req_data_size``
  size of request data payload

``struct nvme_mi_admin_resp_hdr *admin_resp``
  buffer for response data

``off_t resp_data_offset``
  offset into request data to retrieve from controller

``size_t *resp_data_size``
  size of response data buffer, updated to received size

**Description**

Performs an arbitrary NVMe Admin command, using the provided request data,
in **admin_req**. The size of the request data *payload* is specified in
**req_data_size** - this does not include the standard header length (so a
header-only request would have a size of 0).

On success, response data is stored in **admin_resp**, which has an optional
appended payload buffer of **resp_data_size** bytes. The actual payload
transferred will be stored in **resp_data_size**. These sizes do not include
the Admin request header, so 0 represents no payload.

As with all Admin commands, we can request partial data from the Admin
Response payload, offset by **resp_data_offset**.

See: :c:type:`struct nvme_mi_admin_req_hdr <nvme_mi_admin_req_hdr>` and :c:type:`struct nvme_mi_admin_resp_hdr <nvme_mi_admin_resp_hdr>`.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise..


.. c:function:: int nvme_mi_admin_admin_passthru (nvme_mi_ctrl_t ctrl, __u8 opcode, __u8 flags, __u16 rsvd, __u32 nsid, __u32 cdw2, __u32 cdw3, __u32 cdw10, __u32 cdw11, __u32 cdw12, __u32 cdw13, __u32 cdw14, __u32 cdw15, __u32 data_len, void *data, __u32 metadata_len, void *metadata, __u32 timeout_ms, __u32 *result)

   Submit an nvme admin passthrough command

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``__u8 opcode``
  The nvme admin command to send

``__u8 flags``
  NVMe command flags (not used)

``__u16 rsvd``
  Reserved for future use

``__u32 nsid``
  Namespace identifier

``__u32 cdw2``
  Command dword 2

``__u32 cdw3``
  Command dword 3

``__u32 cdw10``
  Command dword 10

``__u32 cdw11``
  Command dword 11

``__u32 cdw12``
  Command dword 12

``__u32 cdw13``
  Command dword 13

``__u32 cdw14``
  Command dword 14

``__u32 cdw15``
  Command dword 15

``__u32 data_len``
  Length of the data transferred in this command in bytes

``void *data``
  Pointer to user address of the data buffer

``__u32 metadata_len``
  Length of metadata transferred in this command(not used)

``void *metadata``
  Pointer to user address of the metadata buffer(not used)

``__u32 timeout_ms``
  How long to wait for the command to complete

``__u32 *result``
  Optional field to return the result from the CQE dword 0

**Description**

Send a customized NVMe Admin command request message and get the corresponding
response message.

This interface supports no data, host to controller and controller to
host but it doesn't support bidirectional data transfer.
Also this interface only supports data transfer size range [0, 4096] (bytes)
so the & data_len parameter must be less than 4097.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify_partial (nvme_mi_ctrl_t ctrl, struct nvme_identify_args *args, off_t offset, size_t size)

   Perform an Admin identify command, and retrieve partial response data.

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``struct nvme_identify_args *args``
  Identify command arguments

``off_t offset``
  offset of identify data to retrieve from response

``size_t size``
  size of identify data to return

**Description**

Perform an Identify command, using the Identify command parameters in **args**.
The **offset** and **size** arguments allow the caller to retrieve part of
the identify response. See NVMe-MI section 6.2 for the semantics (and some
handy diagrams) of the offset & size parameters.

Will return an error if the length of the response data (from the controller)
did not match **size**.

Unless you're performing a vendor-unique identify command, You'll probably
want to use one of the identify helpers (nvme_mi_admin_identify,
nvme_mi_admin_identify_cns_nsid, or nvme_mi_admin_identify_<type>) instead
of this. If the type of your identify command is standardized but not
yet supported by libnvme-mi, please contact the maintainers.

See: :c:type:`struct nvme_identify_args <nvme_identify_args>`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify (nvme_mi_ctrl_t ctrl, struct nvme_identify_args *args)

   Perform an Admin identify command.

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``struct nvme_identify_args *args``
  Identify command arguments

**Description**

Perform an Identify command, using the Identify command parameters in **args**.
Stores the identify data in ->data, and (if set) the result from cdw0
into args->result.

Will return an error if the length of the response data (from the
controller) is not a full :c:type:`NVME_IDENTIFY_DATA_SIZE`.

See: :c:type:`struct nvme_identify_args <nvme_identify_args>`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify_cns_nsid (nvme_mi_ctrl_t ctrl, enum nvme_identify_cns cns, __u32 nsid, void *data)

   Perform an Admin identify command using specific CNS/NSID parameters.

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``enum nvme_identify_cns cns``
  Controller or Namespace Structure, specifying identified object

``__u32 nsid``
  namespace ID

``void *data``
  buffer for identify data response

**Description**

Perform an Identify command, using the CNS specifier **cns**, and the
namespace ID **nsid** if required by the CNS type.

Stores the identify data in **data**, which is expected to be a buffer of
:c:type:`NVME_IDENTIFY_DATA_SIZE` bytes.

Will return an error if the length of the response data (from the
controller) is not a full :c:type:`NVME_IDENTIFY_DATA_SIZE`.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify_ns (nvme_mi_ctrl_t ctrl, __u32 nsid, struct nvme_id_ns *ns)

   Perform an Admin identify command for a namespace

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``__u32 nsid``
  namespace ID

``struct nvme_id_ns *ns``
  Namespace identification to populate

**Description**

Perform an Identify (namespace) command, setting the namespace id data
in **ns**. The namespace is expected to active and allocated.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify_ns_descs (nvme_mi_ctrl_t ctrl, __u32 nsid, struct nvme_ns_id_desc *descs)

   Perform an Admin identify Namespace Identification Descriptor list command for a namespace

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``__u32 nsid``
  Namespace ID

``struct nvme_ns_id_desc *descs``
  Namespace Identification Descriptor list to populate

**Description**

Perform an Identify namespace identification description list command,
setting the namespace identification description list in **descs**

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify_allocated_ns (nvme_mi_ctrl_t ctrl, __u32 nsid, struct nvme_id_ns *ns)

   Perform an Admin identify command for an allocated namespace

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``__u32 nsid``
  namespace ID

``struct nvme_id_ns *ns``
  Namespace identification to populate

**Description**

Perform an Identify (namespace) command, setting the namespace id data
in **ns**.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify_ctrl (nvme_mi_ctrl_t ctrl, struct nvme_id_ctrl *id)

   Perform an Admin identify for a controller

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``struct nvme_id_ctrl *id``
  Controller identify data to populate

**Description**

Perform an Identify command, for the controller specified by **ctrl**,
writing identify data to **id**.

Will return an error if the length of the response data (from the
controller) is not a full :c:type:`NVME_IDENTIFY_DATA_SIZE`, so **id** will be
fully populated on success.

See: :c:type:`struct nvme_id_ctrl <nvme_id_ctrl>`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify_ctrl_list (nvme_mi_ctrl_t ctrl, __u16 cntid, struct nvme_ctrl_list *list)

   Perform an Admin identify for a controller list.

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``__u16 cntid``
  Controller ID to specify list start

``struct nvme_ctrl_list *list``
  List data to populate

**Description**

Perform an Identify command, for the controller list starting with
IDs greater than or equal to **cntid**.

Will return an error if the length of the response data (from the
controller) is not a full :c:type:`NVME_IDENTIFY_DATA_SIZE`, so **id** will be
fully populated on success.

See: :c:type:`struct nvme_ctrl_list <nvme_ctrl_list>`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify_nsid_ctrl_list (nvme_mi_ctrl_t ctrl, __u32 nsid, __u16 cntid, struct nvme_ctrl_list *list)

   Perform an Admin identify for a controller list with specific namespace ID

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``__u32 nsid``
  Namespace identifier

``__u16 cntid``
  Controller ID to specify list start

``struct nvme_ctrl_list *list``
  List data to populate

**Description**

Perform an Identify command, for the controller list for **nsid**, starting
with IDs greater than or equal to **cntid**.

Will return an error if the length of the response data (from the
controller) is not a full :c:type:`NVME_IDENTIFY_DATA_SIZE`, so **id** will be
fully populated on success.

See: :c:type:`struct nvme_ctrl_list <nvme_ctrl_list>`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify_allocated_ns_list (nvme_mi_ctrl_t ctrl, __u32 nsid, struct nvme_ns_list *list)

   Perform an Admin identify for an allocated namespace list

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``__u32 nsid``
  Namespace ID to specify list start

``struct nvme_ns_list *list``
  List data to populate

**Description**

Perform an Identify command, for the allocated namespace list starting with
IDs greater than or equal to **nsid**. Specify :c:type:`NVME_NSID_NONE` for the start
of the list.

Will return an error if the length of the response data (from the
controller) is not a full :c:type:`NVME_IDENTIFY_DATA_SIZE`, so **list** will be
be fully populated on success.

See: :c:type:`struct nvme_ns_list <nvme_ns_list>`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify_active_ns_list (nvme_mi_ctrl_t ctrl, __u32 nsid, struct nvme_ns_list *list)

   Perform an Admin identify for an active namespace list

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``__u32 nsid``
  Namespace ID to specify list start

``struct nvme_ns_list *list``
  List data to populate

**Description**

Perform an Identify command, for the active namespace list starting with
IDs greater than or equal to **nsid**. Specify :c:type:`NVME_NSID_NONE` for the start
of the list.

Will return an error if the length of the response data (from the
controller) is not a full :c:type:`NVME_IDENTIFY_DATA_SIZE`, so **list** will be
be fully populated on success.

See: :c:type:`struct nvme_ns_list <nvme_ns_list>`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_identify_primary_ctrl (nvme_mi_ctrl_t ctrl, __u16 cntid, struct nvme_primary_ctrl_cap *cap)

   Perform an Admin identify for primary controller capabilities data structure.

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``__u16 cntid``
  Controller ID to specify

``struct nvme_primary_ctrl_cap *cap``
  Primary Controller Capabilities data structure to populate

**Description**

Perform an Identify command to get the Primary Controller Capabilities data
for the controller specified by **cntid**

Will return an error if the length of the response data (from the
controller) is not a full :c:type:`NVME_IDENTIFY_DATA_SIZE`, so **cap** will be
be fully populated on success.

See: :c:type:`struct nvme_primary_ctrl_cap <nvme_primary_ctrl_cap>`

**Return**

0 on success, non-zero on failure


.. c:function:: int nvme_mi_admin_identify_secondary_ctrl_list (nvme_mi_ctrl_t ctrl, __u32 nsid, __u16 cntid, struct nvme_secondary_ctrl_list *list)

   Perform an Admin identify for a secondary controller list.

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to process identify command

``__u32 nsid``
  Namespace ID to specify list start

``__u16 cntid``
  Controller ID to specify list start

``struct nvme_secondary_ctrl_list *list``
  List data to populate

**Description**

Perform an Identify command, for the secondary controllers associated with
the current primary controller. Only entries with IDs greater than or
equal to **cntid** are returned.

Will return an error if the length of the response data (from the
controller) is not a full :c:type:`NVME_IDENTIFY_DATA_SIZE`, so **list** will be
be fully populated on success.

See: :c:type:`struct nvme_secondary_ctrl_list <nvme_secondary_ctrl_list>`

**Return**

0 on success, non-zero on failure


.. c:function:: int nvme_mi_admin_get_log_page (nvme_mi_ctrl_t ctrl, __u32 xfer_len, struct nvme_get_log_args *args)

   Retrieve log page data from controller

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``__u32 xfer_len``
  The chunk size of the read

``struct nvme_get_log_args *args``
  Get Log Page command arguments

**Description**

Performs a Get Log Page Admin command as specified by **args**. Response data
is stored in **args->data**, which should be a buffer of **args->data_len** bytes.
Resulting data length is stored in **args->data_len** on successful
command completion.

This request may be implemented as multiple log page commands, in order
to fit within MI message-size limits.

See: :c:type:`struct nvme_get_log_args <nvme_get_log_args>`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log (nvme_mi_ctrl_t ctrl, struct nvme_get_log_args *args)

   Retrieve log page data from controller

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``struct nvme_get_log_args *args``
  Get Log Page command arguments

**Description**

Performs a Get Log Page Admin command as specified by **args**. Response data
is stored in **args->data**, which should be a buffer of **args->data_len** bytes.
Resulting data length is stored in **args->data_len** on successful
command completion.

This request may be implemented as multiple log page commands, in order
to fit within MI message-size limits.

See: :c:type:`struct nvme_get_log_args <nvme_get_log_args>`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_nsid_log (nvme_mi_ctrl_t ctrl, bool rae, enum nvme_cmd_get_log_lid lid, __u32 nsid, __u32 len, void *log)

   Helper for Get Log Page functions

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain Asynchronous Events

``enum nvme_cmd_get_log_lid lid``
  Log identifier

``__u32 nsid``
  Namespace ID

``__u32 len``
  length of log buffer

``void *log``
  pointer for resulting log data

**Description**

Performs a Get Log Page Admin command for a specific log ID **lid** and
namespace ID **nsid**. Log data is expected to be **len** bytes, and is stored
in **log** on success. The **rae** flag is passed as-is to the Get Log Page
command, and is specific to the Log Page requested.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_simple (nvme_mi_ctrl_t ctrl, enum nvme_cmd_get_log_lid lid, __u32 len, void *log)

   Helper for Get Log Page functions with no NSID or RAE requirements

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``enum nvme_cmd_get_log_lid lid``
  Log identifier

``__u32 len``
  length of log buffer

``void *log``
  pointer for resulting log data

**Description**

Performs a Get Log Page Admin command for a specific log ID **lid**, using
NVME_NSID_ALL for the namespace identifier, and rae set to false.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_supported_log_pages (nvme_mi_ctrl_t ctrl, bool rae, struct nvme_supported_log_pages *log)

   Retrieve nmve supported log pages

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``struct nvme_supported_log_pages *log``
  Array of LID supported and Effects data structures

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_error (nvme_mi_ctrl_t ctrl, unsigned int nr_entries, bool rae, struct nvme_error_log_page *err_log)

   Retrieve nvme error log

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``unsigned int nr_entries``
  Number of error log entries allocated

``bool rae``
  Retain asynchronous events

``struct nvme_error_log_page *err_log``
  Array of error logs of size 'entries'

**Description**

This log page describes extended error information for a command that
completed with error, or may report an error that is not specific to a
particular command.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_smart (nvme_mi_ctrl_t ctrl, __u32 nsid, bool rae, struct nvme_smart_log *smart_log)

   Retrieve nvme smart log

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``__u32 nsid``
  Optional namespace identifier

``bool rae``
  Retain asynchronous events

``struct nvme_smart_log *smart_log``
  User address to store the smart log

**Description**

This log page provides SMART and general health information. The information
provided is over the life of the controller and is retained across power
cycles. To request the controller log page, the namespace identifier
specified is FFFFFFFFh. The controller may also support requesting the log
page on a per namespace basis, as indicated by bit 0 of the LPA field in the
Identify Controller data structure.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_fw_slot (nvme_mi_ctrl_t ctrl, bool rae, struct nvme_firmware_slot *fw_log)

   Retrieves the controller firmware log

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``struct nvme_firmware_slot *fw_log``
  User address to store the log page

**Description**

This log page describes the firmware revision stored in each firmware slot
supported. The firmware revision is indicated as an ASCII string. The log
page also indicates the active slot number.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_changed_ns_list (nvme_mi_ctrl_t ctrl, bool rae, struct nvme_ns_list *ns_log)

   Retrieve namespace changed list

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``struct nvme_ns_list *ns_log``
  User address to store the log page

**Description**

This log page describes namespaces attached to this controller that have
changed since the last time the namespace was identified, been added, or
deleted.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_cmd_effects (nvme_mi_ctrl_t ctrl, enum nvme_csi csi, struct nvme_cmd_effects_log *effects_log)

   Retrieve nvme command effects log

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``enum nvme_csi csi``
  Command Set Identifier

``struct nvme_cmd_effects_log *effects_log``
  User address to store the effects log

**Description**

This log page describes the commands that the controller supports and the
effects of those commands on the state of the NVM subsystem.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_device_self_test (nvme_mi_ctrl_t ctrl, struct nvme_self_test_log *log)

   Retrieve the device self test log

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``struct nvme_self_test_log *log``
  Userspace address of the log payload

**Description**

The log page indicates the status of an in progress self test and the
percent complete of that operation, and the results of the previous 20
self-test operations.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_create_telemetry_host (nvme_mi_ctrl_t ctrl, struct nvme_telemetry_log *log)

   Create host telemetry log

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``struct nvme_telemetry_log *log``
  Userspace address of the log payload

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_telemetry_host (nvme_mi_ctrl_t ctrl, __u64 offset, __u32 len, void *log)

   Get Telemetry Host-Initiated log page

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``__u64 offset``
  Offset into the telemetry data

``__u32 len``
  Length of provided user buffer to hold the log data in bytes

``void *log``
  User address for log page data

**Description**

Retrieves the Telemetry Host-Initiated log page at the requested offset
using the previously existing capture.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_telemetry_ctrl (nvme_mi_ctrl_t ctrl, bool rae, __u64 offset, __u32 len, void *log)

   Get Telemetry Controller-Initiated log page

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``__u64 offset``
  Offset into the telemetry data

``__u32 len``
  Length of provided user buffer to hold the log data in bytes

``void *log``
  User address for log page data

**Description**

Retrieves the Telemetry Controller-Initiated log page at the requested offset
using the previously existing capture.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_endurance_group (nvme_mi_ctrl_t ctrl, __u16 endgid, struct nvme_endurance_group_log *log)

   Get Endurance Group log

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``__u16 endgid``
  Starting group identifier to return in the list

``struct nvme_endurance_group_log *log``
  User address to store the endurance log

**Description**

This log page indicates if an Endurance Group Event has occurred for a
particular Endurance Group. If an Endurance Group Event has occurred, the
details of the particular event are included in the Endurance Group
Information log page for that Endurance Group. An asynchronous event is
generated when an entry for an Endurance Group is newly added to this log
page.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_predictable_lat_nvmset (nvme_mi_ctrl_t ctrl, __u16 nvmsetid, struct nvme_nvmset_predictable_lat_log *log)

   Predictable Latency Per NVM Set

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``__u16 nvmsetid``
  NVM set id

``struct nvme_nvmset_predictable_lat_log *log``
  User address to store the predictable latency log

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_predictable_lat_event (nvme_mi_ctrl_t ctrl, bool rae, __u32 offset, __u32 len, void *log)

   Retrieve Predictable Latency Event Aggregate Log Page

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``__u32 offset``
  Offset into the predictable latency event

``__u32 len``
  Length of provided user buffer to hold the log data in bytes

``void *log``
  User address for log page data

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_ana (nvme_mi_ctrl_t ctrl, enum nvme_log_ana_lsp lsp, bool rae, __u64 offset, __u32 len, void *log)

   Retrieve Asymmetric Namespace Access log page

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``enum nvme_log_ana_lsp lsp``
  Log specific, see :c:type:`enum nvme_get_log_ana_lsp <nvme_get_log_ana_lsp>`

``bool rae``
  Retain asynchronous events

``__u64 offset``
  Offset to the start of the log page

``__u32 len``
  The allocated length of the log page

``void *log``
  User address to store the ana log

**Description**

This log consists of a header describing the log and descriptors containing
the asymmetric namespace access information for ANA Groups that contain
namespaces that are attached to the controller processing the command.

See :c:type:`struct nvme_ana_rsp_hdr <nvme_ana_rsp_hdr>` for the definition of the returned structure.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_ana_groups (nvme_mi_ctrl_t ctrl, bool rae, __u32 len, struct nvme_ana_group_desc *log)

   Retrieve Asymmetric Namespace Access groups only log page

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``__u32 len``
  The allocated length of the log page

``struct nvme_ana_group_desc *log``
  User address to store the ana group log

**Description**

See :c:type:`struct nvme_ana_group_desc <nvme_ana_group_desc>` for the definition of the returned structure.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_lba_status (nvme_mi_ctrl_t ctrl, bool rae, __u64 offset, __u32 len, void *log)

   Retrieve LBA Status

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``__u64 offset``
  Offset to the start of the log page

``__u32 len``
  The allocated length of the log page

``void *log``
  User address to store the log page

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_endurance_grp_evt (nvme_mi_ctrl_t ctrl, bool rae, __u32 offset, __u32 len, void *log)

   Retrieve Rotational Media Information

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``__u32 offset``
  Offset to the start of the log page

``__u32 len``
  The allocated length of the log page

``void *log``
  User address to store the log page

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_fid_supported_effects (nvme_mi_ctrl_t ctrl, bool rae, struct nvme_fid_supported_effects_log *log)

   Retrieve Feature Identifiers Supported and Effects

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``struct nvme_fid_supported_effects_log *log``
  FID Supported and Effects data structure

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_mi_cmd_supported_effects (nvme_mi_ctrl_t ctrl, bool rae, struct nvme_mi_cmd_supported_effects_log *log)

   displays the MI Commands Supported by the controller

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``struct nvme_mi_cmd_supported_effects_log *log``
  MI Command Supported and Effects data structure

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_boot_partition (nvme_mi_ctrl_t ctrl, bool rae, __u8 lsp, __u32 len, struct nvme_boot_partition *part)

   Retrieve Boot Partition

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``__u8 lsp``
  The log specified field of LID

``__u32 len``
  The allocated size, minimum
  struct nvme_boot_partition

``struct nvme_boot_partition *part``
  User address to store the log page

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_discovery (nvme_mi_ctrl_t ctrl, bool rae, __u32 offset, __u32 len, void *log)

   Retrieve Discovery log page

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``__u32 offset``
  Offset of this log to retrieve

``__u32 len``
  The allocated size for this portion of the log

``void *log``
  User address to store the discovery log

**Description**

Supported only by fabrics discovery controllers, returning discovery
records.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_media_unit_stat (nvme_mi_ctrl_t ctrl, __u16 domid, struct nvme_media_unit_stat_log *mus)

   Retrieve Media Unit Status

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``__u16 domid``
  Domain Identifier selection, if supported

``struct nvme_media_unit_stat_log *mus``
  User address to store the Media Unit statistics log

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_support_cap_config_list (nvme_mi_ctrl_t ctrl, __u16 domid, struct nvme_supported_cap_config_list_log *cap)

   Retrieve Supported Capacity Configuration List

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``__u16 domid``
  Domain Identifier selection, if supported

``struct nvme_supported_cap_config_list_log *cap``
  User address to store supported capabilities config list

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_reservation (nvme_mi_ctrl_t ctrl, bool rae, struct nvme_resv_notification_log *log)

   Retrieve Reservation Notification

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``struct nvme_resv_notification_log *log``
  User address to store the reservation log

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_sanitize (nvme_mi_ctrl_t ctrl, bool rae, struct nvme_sanitize_log_page *log)

   Retrieve Sanitize Status

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``bool rae``
  Retain asynchronous events

``struct nvme_sanitize_log_page *log``
  User address to store the sanitize log

**Description**

The Sanitize Status log page reports sanitize operation time estimates and
information about the most recent sanitize operation.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_zns_changed_zones (nvme_mi_ctrl_t ctrl, __u32 nsid, bool rae, struct nvme_zns_changed_zone_log *log)

   Retrieve list of zones that have changed

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``__u32 nsid``
  Namespace ID

``bool rae``
  Retain asynchronous events

``struct nvme_zns_changed_zone_log *log``
  User address to store the changed zone log

**Description**

The list of zones that have changed state due to an exceptional event.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_log_persistent_event (nvme_mi_ctrl_t ctrl, enum nvme_pevent_log_action action, __u32 size, void *pevent_log)

   Retrieve Persistent Event Log

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to query

``enum nvme_pevent_log_action action``
  Action the controller should take during processing this command

``__u32 size``
  Size of **pevent_log**

``void *pevent_log``
  User address to store the persistent event log

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_security_send (nvme_mi_ctrl_t ctrl, struct nvme_security_send_args *args)

   Perform a Security Send command on a controller.

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``struct nvme_security_send_args *args``
  Security Send command arguments

**Description**

Performs a Security Send Admin command as specified by **args**. Response data
is stored in **args->data**, which should be a buffer of **args->data_len** bytes.
Resulting data length is stored in **args->data_len** on successful
command completion.

Security Send data length should not be greater than 4096 bytes to
comply with specification limits.

See: :c:type:`struct nvme_get_log_args <nvme_get_log_args>`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_security_recv (nvme_mi_ctrl_t ctrl, struct nvme_security_receive_args *args)

   Perform a Security Receive command on a controller.

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``struct nvme_security_receive_args *args``
  Security Receive command arguments

**Description**

Performs a Security Receive Admin command as specified by **args**. Response
data is stored in **args->data**, which should be a buffer of **args->data_len**
bytes. Resulting data length is stored in **args->data_len** on successful
command completion.

Security Receive data length should not be greater than 4096 bytes to
comply with specification limits.

See: :c:type:`struct nvme_get_log_args <nvme_get_log_args>`

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_features (nvme_mi_ctrl_t ctrl, struct nvme_get_features_args *args)

   Perform a Get Feature command on a controller

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``struct nvme_get_features_args *args``
  Get Features command arguments

**Description**

Performs a Get Features Admin command as specified by **args**. Returned
feature data will be stored in **args->result** and **args->data**, depending
on the specification of the feature itself; most features do not return
additional data. See section 5.27.1 of the NVMe spec (v2.0b) for
feature-specific information.

On success, **args->data_len** will be updated with the actual data length
received.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_features_data (nvme_mi_ctrl_t ctrl, enum nvme_features_id fid, __u32 nsid, __u32 data_len, void *data, __u32 *result)

   Helper function for :c:type:`nvme_mi_admin_get_features`()

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``enum nvme_features_id fid``
  Feature identifier

``__u32 nsid``
  Namespace ID, if applicable for **fid**

``__u32 data_len``
  Length of feature data, if applicable for **fid**, in bytes

``void *data``
  User address of feature data, if applicable

``__u32 *result``
  The command completion result from CQE dword0

**Description**

Helper for optionally features that optionally return data, using the
SEL_CURRENT selector value.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_get_features_simple (nvme_mi_ctrl_t ctrl, enum nvme_features_id fid, __u32 nsid, __u32 *result)

   Get a simple feature value with no data

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``enum nvme_features_id fid``
  Feature identifier

``__u32 nsid``
  Namespace id, if required by **fid**

``__u32 *result``
  output feature data


.. c:function:: int nvme_mi_admin_set_features (nvme_mi_ctrl_t ctrl, struct nvme_set_features_args *args)

   Perform a Set Features command on a controller

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``struct nvme_set_features_args *args``
  Set Features command arguments

**Description**

Performs a Set Features Admin command as specified by **args**. Result
data will be stored in **args->result**.
on the specification of the feature itself; most features do not return
additional data. See section 5.27.1 of the NVMe spec (v2.0b) for
feature-specific information.

On success, **args->data_len** will be updated with the actual data length
received.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_ns_mgmt (nvme_mi_ctrl_t ctrl, struct nvme_ns_mgmt_args *args)

   Issue a Namespace Management command

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``struct nvme_ns_mgmt_args *args``
  Namespace management command arguments

**Description**

Issues a Namespace Management command to **ctrl**, with arguments specified
from **args**.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_ns_mgmt_create (nvme_mi_ctrl_t ctrl, struct nvme_id_ns *ns, __u8 csi, __u32 *nsid)

   Helper for Namespace Management Create command

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``struct nvme_id_ns *ns``
  New namespace parameters

``__u8 csi``
  Command Set Identifier for new NS

``__u32 *nsid``
  Set to new namespace ID on create

**Description**

Issues a Namespace Management (Create) command to **ctrl**, to create a
new namespace specified by **ns**, using command set **csi**. On success,
the new namespace ID will be written to **nsid**.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_ns_mgmt_delete (nvme_mi_ctrl_t ctrl, __u32 nsid)

   Helper for Namespace Management Delete command

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``__u32 nsid``
  Namespace ID to delete

**Description**

Issues a Namespace Management (Delete) command to **ctrl**, to delete the
namespace with id **nsid**.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_ns_attach (nvme_mi_ctrl_t ctrl, struct nvme_ns_attach_args *args)

   Attach or detach namespace to controller(s)

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``struct nvme_ns_attach_args *args``
  Namespace Attach command arguments

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_ns_attach_ctrls (nvme_mi_ctrl_t ctrl, __u32 nsid, struct nvme_ctrl_list *ctrlist)

   Attach namespace to controllers

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``__u32 nsid``
  Namespace ID to attach

``struct nvme_ctrl_list *ctrlist``
  Controller list to modify attachment state of nsid

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_ns_detach_ctrls (nvme_mi_ctrl_t ctrl, __u32 nsid, struct nvme_ctrl_list *ctrlist)

   Detach namespace from controllers

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``__u32 nsid``
  Namespace ID to detach

``struct nvme_ctrl_list *ctrlist``
  Controller list to modify attachment state of nsid

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_fw_download (nvme_mi_ctrl_t ctrl, struct nvme_fw_download_args *args)

   Download part or all of a firmware image to the controller

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send firmware data to

``struct nvme_fw_download_args *args``
  :c:type:`struct nvme_fw_download_args <nvme_fw_download_args>` argument structure

**Description**

The Firmware Image Download command downloads all or a portion of an image
for a future update to the controller. The Firmware Image Download command
downloads a new image (in whole or in part) to the controller.

The image may be constructed of multiple pieces that are individually
downloaded with separate Firmware Image Download commands. Each Firmware
Image Download command includes a Dword Offset and Number of Dwords that
specify a dword range.

The new firmware image is not activated as part of the Firmware Image
Download command. Use the nvme_mi_admin_fw_commit() to activate a newly
downloaded image.

**Return**

0 on success, non-zero on failure


.. c:function:: int nvme_mi_admin_fw_commit (nvme_mi_ctrl_t ctrl, struct nvme_fw_commit_args *args)

   Commit firmware using the specified action

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send firmware data to

``struct nvme_fw_commit_args *args``
  :c:type:`struct nvme_fw_download_args <nvme_fw_download_args>` argument structure

**Description**

The Firmware Commit command modifies the firmware image or Boot Partitions.

**Return**

0 on success, non-zero on failure


.. c:function:: int nvme_mi_admin_format_nvm (nvme_mi_ctrl_t ctrl, struct nvme_format_nvm_args *args)

   Format NVMe namespace

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``struct nvme_format_nvm_args *args``
  Format NVM command arguments

**Description**

Perform a low-level format to set the LBA data & metadata size. May destroy
data & metadata on the specified namespaces

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


.. c:function:: int nvme_mi_admin_sanitize_nvm (nvme_mi_ctrl_t ctrl, struct nvme_sanitize_nvm_args *args)

   Start a subsystem Sanitize operation

**Parameters**

``nvme_mi_ctrl_t ctrl``
  Controller to send command to

``struct nvme_sanitize_nvm_args *args``
  Sanitize command arguments

**Description**

A sanitize operation alters all user data in the NVM subsystem such that
recovery of any previous user data from any cache, the non-volatile media,
or any Controller Memory Buffer is not possible.

The Sanitize command starts a sanitize operation or to recover from a
previously failed sanitize operation. The sanitize operation types that may
be supported are Block Erase, Crypto Erase, and Overwrite. All sanitize
operations are processed in the background, i.e., completion of the sanitize
command does not indicate completion of the sanitize operation.

**Return**

The nvme command status if a response was received (see
:c:type:`enum nvme_status_field <nvme_status_field>`) or -1 with errno set otherwise.


