_NVME_COMMAND Struct Reference

#include <nvme.h>

Data Fields
unsigned short	qID
unsigned short	cmdSlotTag
unsigned int	cmdSeqNum
unsigned int	cmdDword [16]

Detailed Description

The main structure of NVMe Commands.

Definition at line 205 of file nvme.h.

Field Documentation

cmdDword

unsigned int _NVME_COMMAND::cmdDword[16]

Each command consisted of 16 DWORDs (64B), also called CDW (Command DWords):

Todo:

• CDW[00]:
  • bit[00,07]: Command opcode.
  • bit[08,09]: Fused operation, 00 for normal operation.
  • bit[10,13]: RESERVED.
  • bit[14,15]: 00 for PRP, otherwise SGL.
  • bit[16,31]: Command ID.
• CDW[01]: NSID (NameSpace ID, infomation of the controller and driver?)
• CDW[02,03]: RESERVED.
• CDW[04,05]: Metadata pointer.
• CDW[06,07]: PRP[0], physical memory address of data or PRP list
• CDW[08,09]: PRP[1], physical memory address of data or PRP list
  • the first entry of PRP list may be misaligned
  • the last entry may point to a page that contains more PRP entries
• CDW[10,15]: Command specific.

This member will be casted to NVME_IO_COMMAND or NVME_ADMIN_COMMAND.

Definition at line 233 of file nvme.h.

cmdSeqNum

unsigned int _NVME_COMMAND::cmdSeqNum

Definition at line 209 of file nvme.h.

cmdSlotTag

unsigned short _NVME_COMMAND::cmdSlotTag

Definition at line 208 of file nvme.h.

qID

unsigned short _NVME_COMMAND::qID

Definition at line 207 of file nvme.h.

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The documentation for this struct was generated from the following file:

• Toshiba-8c8w/nvme/nvme.h