nvme_io_args - Man Page

struct nvme_io_args {
   __u64 slba;
   __u64 storage_tag;
   __u32 *result;
   void *data;
   void *metadata;
   int args_size;
   int fd;
   __u32 timeout;
   __u32 nsid;
   __u32 reftag;
   __u32 data_len;
   __u32 metadata_len;
   __u16 nlb;
   __u16 control;
   __u16 apptag;
   __u16 appmask;
   __u16 dspec;
   __u8 dsm;
   __u8 rsvd1[1];
   __u64 reftag_u64;
   __u8 sts;
   __u8 pif;
};

slba

Starting logical block

storage_tag

This filed specifies Variable Sized Expected Logical Block Storage Tag (ELBST) or Logical Block Storage Tag (LBST)

result

The command completion result from CQE dword0

data

Pointer to user address of the data buffer

metadata

Pointer to user address of the metadata buffer

args_size

Size of struct nvme_io_args

fd

File descriptor of nvme device

timeout

Timeout in ms

nsid

Namespace ID

reftag

This field specifies the variable sized Expected Initial Logical Block Reference Tag (EILBRT) or Initial Logical Block Reference Tag (ILBRT). Used only if the namespace is formatted to use end-to-end protection information.

data_len

Length of user buffer, data, in bytes

metadata_len

Length of user buffer, metadata, in bytes

nlb

Number of logical blocks to send (0's based value)

control

Command control flags, see enum nvme_io_control_flags.

apptag

This field specifies the Application Tag Mask expected value. Used only if the namespace is formatted to use end-to-end protection information.

appmask

This field specifies the Application Tag expected value. Used only if the namespace is formatted to use end-to-end protection information.

dspec

Directive specific value

dsm

Data set management attributes, see enum nvme_io_dsm_flags

rsvd1

Reserved

reftag_u64

This field specifies the variable sized Expected Initial Logical Block Reference Tag (EILBRT) or Initial Logical Block Reference Tag (ILBRT). It is the 8 byte version required for enhanced protection information.  Used only if the namespace is formatted to use end-to-end protection information.

sts

Storage tag size in bits, set by namespace Extended LBA Format

pif

Protection information format, determines how variable sized storage_tag and reftag are put into dwords 2, 3, and 14. Set by namespace Extended LBA Format.