libnvme(2)

NAME
struct nvme_io_args - Arguments for NVMe I/O commands

SYNOPSIS
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;
};

Members

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.