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NVME_COMMAND_STATUS union (nvme.h)

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Contains information about the status of a command.

This structure is used in the Status field of the NVME_COMPLETION_ENTRY and in the Status field of the NVME_ERROR_INFO_LOG to indicate the status of a command that has completed.

Syntax

typedef union {
  struct {
    USHORT P : 1;
    USHORT SC : 8;
    USHORT SCT : 3;
    USHORT Reserved : 2;
    USHORT M : 1;
    USHORT DNR : 1;
  } DUMMYSTRUCTNAME;
  USHORT AsUshort;
} NVME_COMMAND_STATUS, *PNVME_COMMAND_STATUS;

Members

DUMMYSTRUCTNAME

DUMMYSTRUCTNAME.P

Indicates whether a Completion Queue entry is a new entry.

The Phase Tag (P) values for all Completion Queue entries should be initialized to ‘0’ by the host software prior to setting the EN field of the NVME_CONTROLLER_CONFIGURATION to 1.

When the controller places an entry in the Completion Queue, it will invert the phase tag to enable host software to identify a new entry. Specifically, for the first set of completion queue entries after EN is set to 1, all Phase Tags are set to 1 when they are posted. For the second set of completion queue entries, when the controller has wrapped around to the top of the Completion Queue, all Phase Tags are cleared to 0 when they are posted. The value of the Phase Tag is inverted on each pass through the Completion Queue.

DUMMYSTRUCTNAME.SC

Indicates a status code identifying any error or status information for the command.

DUMMYSTRUCTNAME.SCT

A NVME_STATUS_TYPES value that indicates the type of status the controller is returning.

DUMMYSTRUCTNAME.Reserved

DUMMYSTRUCTNAME.M

Indicates whether there is additional status information for the command.

When this value is set to 1, there is more status information for this command as part of the Error Information log that can be retrieved with the Get Log Page command.

When this value is cleared to 0, there is no additional status information for this command.

DUMMYSTRUCTNAME.DNR

Indicates whether the command will succeed if it is re-submitted.

When this value is set to 1, it indicates that if the same command is re-submitted it is expected to fail.

When this value is cleared to 0, it indicates that the same command may succeed if retried.

If a command is aborted due to a time limited error recovery, this field should be cleared to 0. If the SCT and SC fields are cleared to 0h then this field should be cleared to 0.

AsUshort

Requirements

Requirement Value
Minimum supported client Windows 10
Header nvme.h

See also