【NVMe2.0b 14】NVMe Admin Command Set

5Admin Command Set

Admin Command Set Defines that you can submit to Admin Submission Queue The order of .

Submit queue entries (submission queue entry,SQE) Structure and all Admin The fields common to the command are listed in 3.3.3 Section . Complete queue entry (completion queue entry,CQE) Structure and all Admin The fields common to the command are listed in 3.3.3.2 Section . This section defines what is used for Admin Command Set Of SQE and CQE Command specific fields in the structure （ namely SQE command Dword 10 To 15、CQE Dword 0 and CQE Dword 1）. Admin Orders should not be subject to I/O queues The effect of state （ for example , complete I/O Completion Queue Should not delay or stop Delete I/O Submission Queue command ）.

Figure 138 All defined Admin command . Mandatory for various controller types 、 Optional and forbidden commands , see also Figure 22、Figure 28 and Figure 32.

Figure 138: Opcodes for Admin Commands

1. Unlisted opcode It's reserved .
2. The command subset uses Namespace Identifier (NSID) Field . If you use Namespace Identifier Field , This field supports FFFFFFFFh, Unless otherwise stated in the footnote in the figure , The value is not supported by a specific command or is only supported under specific conditions . When this field is not used , This field is cleared to
0h, Such as Figure 87 Described in .
3. Indicates the data transmission direction of the command . All options of the command should transfer data or not transfer data according to the specified code . All commands , Include vendor specific commands , The following agreement shall be followed ： 00b = No data transfer ; 01b = Host to controller ; 10b = Controller to host ; 11b = two-way .
4. This command does not support the use of setting to FFFFFFFFh Of Namespace Identifier (NSID) Field .
5. Yes, set to FFFFFFFFh Of Namespace Identifier Field support depends on the instruction operation （ Please refer to the first 8.7 section ）.
6.Namespace Identifier The use of fields depends on Identify Command Medium CNS value , Such as Figure 273 Described in .
7.Namespace Identifier The use of is specific to Security Protocol Of .
8.No = Not I/O Command Set specific, A = All I/O Command Sets, NVM = NVM Command Set specific, ZNS = Zoned Namespace Command Set. all
Fabrics All commands use opcode 7Fh. For more information , Please refer to the first 6 section .

Figure 139 Lists what is being handled sanitize Allowed during operation Admin Command and processing Format NVM Should be allowed during the command Admin command .

If Format NVM Command in progress , Then it means that Format NVM Any namespace affected by the command is not committed in Figure 139 Listed in the Admin The command may be aborted . If so suspended , Then return to Format in Progress Status code for .

If you are processing for a namespace Figure 139 Not listed in Admin command , Commit the that will affect the namespace Format NVM The command may be aborted . If for this reason , Then return to Command Sequence Error Of status code.

Figure 139: Sanitize Operations and Format NVM Command – Admin Commands Allowed

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Abort command
Asynchronous Event Request command
Capacity Management command