libnvme(9)

NAME
struct nvme_uring_cmd - nvme uring command structure

SYNOPSIS
struct nvme_uring_cmd {
__u8 opcode;
__u8 flags;
__u16 rsvd1;
__u32 nsid;
__u32 cdw2;
__u32 cdw3;
__u64 metadata;
__u64 addr;
__u32 metadata_len;
__u32 data_len;
__u32 cdw10;
__u32 cdw11;
__u32 cdw12;
__u32 cdw13;
__u32 cdw14;
__u32 cdw15;
__u32 timeout_ms;
__u32 rsvd2;
};

Members

opcode
    Operation code, see enum nvme_io_opcodes and enum nvme_admin_opcodes

flags
    Not supported: intended for command flags (eg: SGL, FUSE)

rsvd1
    Reserved for future use

nsid
    Namespace Identifier, or Fabrics type

cdw2
    Command Dword 2 (no spec defined use)

cdw3
    Command Dword 3 (no spec defined use)

metadata
    User space address to metadata buffer (NULL if not used)

addr
    User space address to data buffer (NULL if not used)

metadata_len
    Metadata buffer transfer length

data_len
    Data buffer transfer length

cdw10
    Command Dword 10 (command specific)

cdw11
    Command Dword 11 (command specific)

cdw12
    Command Dword 12 (command specific)

cdw13
    Command Dword 13 (command specific)

cdw14
    Command Dword 14 (command specific)

cdw15
    Command Dword 15 (command specific)

timeout_ms
    If non-zero, overrides system default timeout in milliseconds

rsvd2
    Reserved for future use (and fills an implicit struct pad