Ubuntu Manpage: struct nvme_id_ctrl - Identify Controller data structure

NAME

       struct nvme_id_ctrl - Identify Controller data structure

SYNOPSIS

       struct nvme_id_ctrl {
           __le16 vid;
           __le16 ssvid;
           char sn[20];
           char mn[40];
           char fr[8];
           __u8 rab;
           __u8 ieee[3];
           __u8 cmic;
           __u8 mdts;
           __le16 cntlid;
           __le32 ver;
           __le32 rtd3r;
           __le32 rtd3e;
           __le32 oaes;
           __le32 ctratt;
           __le16 rrls;
           __u8 rsvd102[9];
           __u8 cntrltype;
           __u8 fguid[16];
           __le16 crdt1;
           __le16 crdt2;
           __le16 crdt3;
           __u8 rsvd134[119];
           __u8 nvmsr;
           __u8 vwci;
           __u8 mec;
           __le16 oacs;
           __u8 acl;
           __u8 aerl;
           __u8 frmw;
           __u8 lpa;
           __u8 elpe;
           __u8 npss;
           __u8 avscc;
           __u8 apsta;
           __le16 wctemp;
           __le16 cctemp;
           __le16 mtfa;
           __le32 hmpre;
           __le32 hmmin;
           __u8 tnvmcap[16];
           __u8 unvmcap[16];
           __le32 rpmbs;
           __le16 edstt;
           __u8 dsto;
           __u8 fwug;
           __le16 kas;
           __le16 hctma;
           __le16 mntmt;
           __le16 mxtmt;
           __le32 sanicap;
           __le32 hmminds;
           __le16 hmmaxd;
           __le16 nsetidmax;
           __le16 endgidmax;
           __u8 anatt;
           __u8 anacap;
           __le32 anagrpmax;
           __le32 nanagrpid;
           __le32 pels;
           __le16 domainid;
           __u8 rsvd358[10];
           __u8 megcap[16];
           __u8 tmpthha;
           __u8 rsvd385[127];
           __u8 sqes;
           __u8 cqes;
           __le16 maxcmd;
           __le32 nn;
           __le16 oncs;
           __le16 fuses;
           __u8 fna;
           __u8 vwc;
           __le16 awun;
           __le16 awupf;
           __u8 icsvscc;
           __u8 nwpc;
           __le16 acwu;
           __le16 ocfs;
           __le32 sgls;
           __le32 mnan;
           __u8 maxdna[16];
           __le32 maxcna;
           __le32 oaqd;
           __u8 rsvd568[2];
           __u16 cmmrtd;
           __u16 nmmrtd;
           __u8 minmrtg;
           __u8 maxmrtg;
           __u8 trattr;
           __u8 rsvd577;
           __u16 mcudmq;
           __u16 mnsudmq;
           __u16 mcmr;
           __u16 nmcmr;
           __u16 mcdqpc;
           __u8 rsvd588[180];
           char subnqn[NVME_NQN_LENGTH];
           __u8 rsvd1024[768];
           __le32 ioccsz;
           __le32 iorcsz;
           __le16 icdoff;
           __u8 fcatt;
           __u8 msdbd;
           __le16 ofcs;
           __u8 dctype;
           __u8 rsvd1807[241];
           struct nvme_id_psd      psd[32];
           __u8 vs[1024];
        };

Members

vid PCI Vendor ID, the company vendor identifier that is assigned by the PCI SIG.

ssvid PCI Subsystem Vendor ID, the company vendor identifier that is assigned by the PCI SIG for
the subsystem.

sn Serial Number in ASCII

mn Model Number in ASCII

fr Firmware Revision in ASCII, the currently active firmware revision for the NVM subsystem

rab Recommended Arbitration Burst, reported as a power of two

ieee IEEE assigned Organization Unique Identifier

cmic Controller Multipath IO and Namespace Sharing Capabilities of the controller and NVM
subsystem. See enum nvme_id_ctrl_cmic.

mdts Max Data Transfer Size is the largest data transfer size. The host should not submit a
command that exceeds this maximum data transfer size. The value is in units of the minimum
memory page size (CAP.MPSMIN) and is reported as a power of two

cntlid Controller ID, the NVM subsystem unique controller identifier associated with the controller.

ver Version, this field contains the value reported in the Version register, or property (see
enum nvme_registers NVME_REG_VS).

rtd3r RTD3 Resume Latency, the expected latency in microseconds to resume from Runtime D3

rtd3e RTD3 Exit Latency, the typical latency in microseconds to enter Runtime D3.

oaes Optional Async Events Supported, see enum nvme_id_ctrl_oaes.

ctratt Controller Attributes, see enum nvme_id_ctrl_ctratt.

rrls Read Recovery Levels. If a bit is set, then the corresponding Read Recovery Level is
supported. If a bit is cleared, then the corresponding Read Recovery Level is not supported.

rsvd102 Reserved

cntrltype Controller Type, see enum nvme_id_ctrl_cntrltype

fguid FRU GUID, a 128-bit value that is globally unique for a given Field Replaceable Unit

crdt1 Controller Retry Delay time in 100 millisecond units if CQE CRD field is 1

crdt2 Controller Retry Delay time in 100 millisecond units if CQE CRD field is 2

crdt3 Controller Retry Delay time in 100 millisecond units if CQE CRD field is 3

rsvd134 Reserved

nvmsr NVM Subsystem Report, see enum nvme_id_ctrl_nvmsr

vwci VPD Write Cycle Information, see enum nvme_id_ctrl_vwci

mec Management Endpoint Capabilities, see enum nvme_id_ctrl_mec

oacs Optional Admin Command Support,the optional Admin commands and features supported by the
controller, see enum nvme_id_ctrl_oacs.

acl Abort Command Limit, the maximum number of concurrently executing Abort commands supported by
the controller. This is a 0's based value.

aerl Async Event Request Limit, the maximum number of concurrently outstanding Asynchronous Event
Request commands supported by the controller This is a 0's based value.

frmw Firmware Updates indicates capabilities regarding firmware updates. See enum
nvme_id_ctrl_frmw.

lpa Log Page Attributes, see enum nvme_id_ctrl_lpa.

elpe Error Log Page Entries, the maximum number of Error Information log entries that are stored
by the controller. This field is a 0's based value.

npss Number of Power States Supported, the number of NVM Express power states supported by the
controller, indicating the number of valid entries in struct nvme_id_ctrl.psd. This is a 0's
based value.

avscc Admin Vendor Specific Command Configuration, see enum nvme_id_ctrl_avscc.

apsta Autonomous Power State Transition Attributes, see enum nvme_id_ctrl_apsta.

wctemp Warning Composite Temperature Threshold indicates the minimum Composite Temperature field
value (see struct nvme_smart_log.critical_comp_time) that indicates an overheating condition
during which controller operation continues.

cctemp Critical Composite Temperature Threshold, field indicates the minimum Composite Temperature
field value (see struct nvme_smart_log.critical_comp_time) that indicates a critical
overheating condition.

mtfa Maximum Time for Firmware Activation indicates the maximum time the controller temporarily
stops processing commands to activate the firmware image, specified in 100 millisecond units.
This field is always valid if the controller supports firmware activation without a reset.

hmpre Host Memory Buffer Preferred Size indicates the preferred size that the host is requested to
allocate for the Host Memory Buffer feature in 4 KiB units.

hmmin Host Memory Buffer Minimum Size indicates the minimum size that the host is requested to
allocate for the Host Memory Buffer feature in 4 KiB units.

tnvmcap Total NVM Capacity, the total NVM capacity in the NVM subsystem. The value is in bytes.

unvmcap Unallocated NVM Capacity, the unallocated NVM capacity in the NVM subsystem. The value is in
bytes.

rpmbs Replay Protected Memory Block Support, see enum nvme_id_ctrl_rpmbs.

edstt Extended Device Self-test Time, if Device Self-test command is supported (see struct
nvme_id_ctrl.oacs, NVME_CTRL_OACS_SELF_TEST), then this field indicates the nominal amount of
time in one minute units that the controller takes to complete an extended device self-test
operation when in power state 0.

dsto Device Self-test Options, see enum nvme_id_ctrl_dsto.

fwug Firmware Update Granularity indicates the granularity and alignment requirement of the
firmware image being updated by the Firmware Image Download command. The value is reported in
4 KiB units. A value of 0h indicates no information on granularity is provided. A value of
FFh indicates no restriction

kas Keep Alive Support indicates the granularity of the Keep Alive Timer in 100 millisecond
units.

hctma Host Controlled Thermal Management Attributes, see enum nvme_id_ctrl_hctm.

mntmt Minimum Thermal Management Temperature indicates the minimum temperature, in degrees Kelvin,
that the host may request in the Thermal Management Temperature 1 field and Thermal
Management Temperature 2 field of a Set Features command with the Feature Identifier field
set to NVME_FEAT_FID_HCTM.

mxtmt Maximum Thermal Management Temperature indicates the maximum temperature, in degrees Kelvin,
that the host may request in the Thermal Management Temperature 1 field and Thermal
Management Temperature 2 field of the Set Features command with the Feature Identifier set to
NVME_FEAT_FID_HCTM.

sanicap Sanitize Capabilities, see enum nvme_id_ctrl_sanicap

hmminds Host Memory Buffer Minimum Descriptor Entry Size indicates the minimum usable size of a Host
Memory Buffer Descriptor Entry in 4 KiB units.

hmmaxd Host Memory Maximum Descriptors Entries indicates the number of usable Host Memory Buffer
Descriptor Entries.

nsetidmax NVM Set Identifier Maximum, defines the maximum value of a valid NVM Set Identifier for any
controller in the NVM subsystem.

endgidmax Endurance Group Identifier Maximum, defines the maximum value of a valid Endurance Group
Identifier for any controller in the NVM subsystem.

anatt ANA Transition Time indicates the maximum amount of time, in seconds, for a transition
between ANA states or the maximum amount of time, in seconds, that the controller reports the
ANA change state.

anacap Asymmetric Namespace Access Capabilities, see enum nvme_id_ctrl_anacap.

anagrpmax ANA Group Identifier Maximum indicates the maximum value of a valid ANA Group Identifier for
any controller in the NVM subsystem.

nanagrpid Number of ANA Group Identifiers indicates the number of ANA groups supported by this
controller.

pels Persistent Event Log Size indicates the maximum reportable size for the Persistent Event Log.

domainid Domain Identifier indicates the identifier of the domain that contains this controller.

rsvd358 Reserved

megcap Max Endurance Group Capacity indicates the maximum capacity of a single Endurance Group.

tmpthha Temperature Threshold Hysteresis Attributes

rsvd385 Reserved

sqes Submission Queue Entry Size, see enum nvme_id_ctrl_sqes.

cqes Completion Queue Entry Size, see enum nvme_id_ctrl_cqes.

maxcmd Maximum Outstanding Commands indicates the maximum number of commands that the controller
processes at one time for a particular queue.

nn Number of Namespaces indicates the maximum value of a valid nsid for the NVM subsystem. If
the MNAN (struct nvme_id_ctrl.mnan field is cleared to 0h, then this field also indicates the
maximum number of namespaces supported by the NVM subsystem.

oncs Optional NVM Command Support, see enum nvme_id_ctrl_oncs.

fuses Fused Operation Support, see enum nvme_id_ctrl_fuses.

fna Format NVM Attributes, see enum nvme_id_ctrl_fna.

vwc Volatile Write Cache, see enum nvme_id_ctrl_vwc.

awun Atomic Write Unit Normal indicates the size of the write operation guaranteed to be written
atomically to the NVM across all namespaces with any supported namespace format during normal
operation. This field is specified in logical blocks and is a 0's based value.

awupf Atomic Write Unit Power Fail indicates the size of the write operation guaranteed to be
written atomically to the NVM across all namespaces with any supported namespace format
during a power fail or error condition. This field is specified in logical blocks and is a
0’s based value.

icsvscc NVM Vendor Specific Command Configuration, see enum nvme_id_ctrl_nvscc.

nwpc Namespace Write Protection Capabilities, see enum nvme_id_ctrl_nwpc.

acwu Atomic Compare & Write Unit indicates the size of the write operation guaranteed to be
written atomically to the NVM across all namespaces with any supported namespace format for a
Compare and Write fused operation. This field is specified in logical blocks and is a 0’s
based value.

ocfs Optional Copy Formats Supported, each bit n means controller supports Copy Format n.

sgls SGL Support, see enum nvme_id_ctrl_sgls

mnan Maximum Number of Allowed Namespaces indicates the maximum number of namespaces supported by
the NVM subsystem.

maxdna Maximum Domain Namespace Attachments indicates the maximum of the sum of the number of
namespaces attached to each I/O controller in the Domain.

maxcna Maximum I/O Controller Namespace Attachments indicates the maximum number of namespaces that
are allowed to be attached to this I/O controller.

oaqd Optimal Aggregated Queue Depth indicates the recommended maximum total number of outstanding
I/O commands across all I/O queues on the controller for optimal operation.

rsvd568 Reserved

cmmrtd Controller Maximum Memory Range Tracking Descriptors indicates the maximum number of Memory
Range Tracking Descriptors the controller supports.

nmmrtd NVM Subsystem Maximum Memory Range Tracking Descriptors indicates the maximum number of
Memory Range Tracking Descriptors the NVM subsystem supports.

minmrtg Minimum Memory Range Tracking Granularity indicates the minimum value supported in the
Requested Memory Range Tracking Granularity (RMRTG) field of the Track Memory Ranges data
structure.

maxmrtg Maximum Memory Range Tracking Granularity indicates the maximum value supported in the
Requested Memory Range Tracking Granularity (RMRTG) field of the Track Memory Ranges data
structure.

trattr Tracking Attributes indicates supported attributes for the Track Send command and Track
Receive command.

rsvd577 Reserved

mcudmq Maximum Controller User Data Migration Queues indicates the maximum number of User Data
Migration Queues supported by the controller.

mnsudmq Maximum NVM Subsystem User Data Migration Queues indicates the maximum number of User Data
Migration Queues supported by the NVM subsystem.

mcmr Maximum CDQ Memory Ranges indicates the maximum number of memory ranges allowed to be
specified by the PRP1 field of a Controller Data Queue command.

nmcmr NVM Subsystem Maximum CDQ Memory Ranges indicates the maximum number of memory ranges for all
Controller Data Queues in the NVM subsystem.

mcdqpc Maximum Controller Data Queue PRP Count indicates the maximum number of PRPs allowed to be
specified in the PRP list in the Controller Data Queue command.

rsvd588 Reserved

subnqn NVM Subsystem NVMe Qualified Name, UTF-8 null terminated string

rsvd1024 Reserved

ioccsz I/O Queue Command Capsule Supported Size, defines the maximum I/O command capsule size in 16
byte units.

iorcsz I/O Queue Response Capsule Supported Size, defines the maximum I/O response capsule size in
16 byte units.

icdoff In Capsule Data Offset, defines the offset where data starts within a capsule. This value is
applicable to I/O Queues only.

fcatt Fabrics Controller Attributes, see enum nvme_id_ctrl_fcatt.

msdbd Maximum SGL Data Block Descriptors indicates the maximum number of SGL Data Block or Keyed
SGL Data Block descriptors that a host is allowed to place in a capsule. A value of 0h
indicates no limit.

ofcs Optional Fabric Commands Support, see enum nvme_id_ctrl_ofcs.

dctype Discovery Controller Type (DCTYPE). This field indicates what type of Discovery controller
the controller is (see enum nvme_id_ctrl_dctype)

rsvd1807 Reserved

psd Power State Descriptors, see struct nvme_id_psd.

vs Vendor Specific

February 2025 struct nvme_id_ctrl libnvme(2)