.. c:struct:: libnvme_passthru_cmd

   nvme passthrough command structure

**Definition**

::

  struct libnvme_passthru_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;
    __u64 result;
  };

**Members**

``opcode``
  Operation code, see :c:type:`enum libnvme_io_opcodes <libnvme_io_opcodes>` and
  :c:type:`enum libnvme_admin_opcodes <libnvme_admin_opcodes>`

``flags``
  Supported only for NVMe-MI

``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

``result``
  Set on completion to the command's CQE DWORD 0-1
  controller response





.. c:struct:: libnvme_uring_cmd

   nvme uring command structure

**Definition**

::

  struct libnvme_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 :c:type:`enum libnvme_io_opcodes <libnvme_io_opcodes>` and
  :c:type:`enum libnvme_admin_opcodes <libnvme_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