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:
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:
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 (nvme_mi_ep_t
) may provide access to multiple controllers - so each of the controller- type commands will require anvme_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
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
enum 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.
-
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.
-
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.
-
enum
nvme_mi_ror
Request or response field.
Constants
NVME_MI_ROR_REQ
request message
NVME_MI_ROR_RSP
response message
-
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
-
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.
-
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
enum 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.
-
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
-
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.
-
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.
-
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.
-
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`().
-
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`().
-
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.
-
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.
-
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 nvme_create_root
.
Return
new root object, or NULL on failure.
-
void
nvme_mi_free_root
(nvme_root_t root) Free root object.
Parameters
nvme_root_t root
root to free
-
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 nvme_mi_init_ctrl
).
Endpoints are created through a transport-specific constructor; currently
only MCTP-connected endpoints are supported, through nvme_mi_open_mctp
.
Subsequent operations on the endpoint (and related controllers) are
transport-independent.
-
nvme_mi_ep_t
nvme_mi_first_endpoint
(nvme_root_t m) Start endpoint iterator
Parameters
nvme_root_t m
nvme_root_t
object
Return
- first MI endpoint object under this root, or NULL if no endpoints
are present.
Description
See: nvme_mi_next_endpoint
, nvme_mi_for_each_endpoint
-
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
nvme_root_t
objectnvme_mi_ep_t e
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: nvme_mi_first_endpoint
, nvme_mi_for_each_endpoint
-
nvme_mi_for_each_endpoint
nvme_mi_for_each_endpoint (m, e)
Iterator for NVMe-MI endpoints.
Parameters
m
nvme_root_t
containing endpointse
nvme_mi_ep_t
object, set on each iteration
-
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
nvme_root_t
containing endpointse
nvme_mi_ep_t
object, set on each iteration_e
nvme_mi_ep_t
object used as temporary storage
-
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
-
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`().
-
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.
-
type
nvme_mi_ctrl_t
NVMe-MI Controller object.
Description
Provides NVMe command functionality, through the MI interface.
-
nvme_mi_ctrl_t
nvme_mi_first_ctrl
(nvme_mi_ep_t ep) Start controller iterator
Parameters
nvme_mi_ep_t ep
nvme_mi_ep_t
object
Return
- first MI controller object under this root, or NULL if no controllers
are present.
Description
See: nvme_mi_next_ctrl
, nvme_mi_for_each_ctrl
-
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
nvme_mi_ep_t
objectnvme_mi_ctrl_t c
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: nvme_mi_first_ctrl
, nvme_mi_for_each_ctrl
-
nvme_mi_for_each_ctrl
nvme_mi_for_each_ctrl (ep, c)
Iterator for NVMe-MI controllers.
Parameters
ep
nvme_mi_ep_t
containing endpointsc
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`()
-
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
nvme_mi_ep_t
containing controllersc
nvme_mi_ctrl_t
object, set on each iteration_c
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`()
-
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 nvme_mi_close
Return
New endpoint object for netid & eid, or NULL on failure.
-
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
-
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
-
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.
Return
0 on success, non-zero on failure
-
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
nvme_mi_mi_read_mi_data_ctrl_list
.
Return
New controller object, or NULL on failure.
-
void
nvme_mi_close_ctrl
(nvme_mi_ctrl_t ctrl) free a controller
Parameters
nvme_mi_ctrl_t ctrl
controller to free
-
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.
-
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 struct nvme_mi_read_nvm_ss_info
.
Return
0 on success, non-zero on failure.
-
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 nvme_mi_mi_read_mi_data_subsys
) nmp field contains the allowed
range of port IDs.
See struct nvme_mi_read_port_info
.
Return
0 on success, non-zero on failure.
-
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.
Return
0 on success, non-zero on failure.
-
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 struct nvme_mi_read_ctrl_info
.
Return
0 on success, non-zero on failure.
-
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 struct nvme_mi_nvm_ss_health_status
.
Return
0 on success, non-zero on failure.
-
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 enum nvme_mi_config_id
for identifiers.
Return
0 on success, non-zero on failure.
-
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 enum nvme_mi_config_id
for identifiers.
Return
0 on success, non-zero on failure.
-
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
0 on success, non-zero on failure.
-
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 struct nvme_mi_read_port_info
for the maximum supported SMBus frequency
for the port.
Return
0 on success, non-zero on failure.
-
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 nvme_mi_mi_subsystem_health_status_poll`(), :c:type:`enum nvme_mi_ccs
for
values in mask.
Return
0 on success, non-zero on failure.
-
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
0 on success, non-zero on failure.
-
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
0 on success, non-zero on failure.
-
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: struct nvme_mi_admin_req_hdr
and struct nvme_mi_admin_resp_hdr
.
Return
0 on success, non-zero on failure.
-
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: struct nvme_identify_args
Return
0 on success, non-zero on failure
-
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 NVME_IDENTIFY_DATA_SIZE
.
See: struct nvme_identify_args
Return
0 on success, non-zero on failure
-
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
NVME_IDENTIFY_DATA_SIZE
bytes.
Will return an error if the length of the response data (from the
controller) is not a full NVME_IDENTIFY_DATA_SIZE
.
Return
0 on success, non-zero on failure
-
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 NVME_IDENTIFY_DATA_SIZE
, so id will be
fully populated on success.
See: struct nvme_id_ctrl
Return
0 on success, non-zero on failure
-
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 NVME_IDENTIFY_DATA_SIZE
, so id will be
fully populated on success.
Return
0 on success, non-zero on failure
-
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: struct nvme_get_log_args
Return
0 on success, non-zero on failure
-
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: struct nvme_get_log_args
Return
0 on success, non-zero on failure
-
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: struct nvme_get_log_args
Return
0 on success, non-zero on failure