[edk2-devel] [PATCH v1 1/1] MdeModulePkg/NvmExpressDxe: Allow other NSIDs for Admin commands

Thu Sep 5 02:07:32 UTC 2019

Hello Tyler,

Some inline comments below.

Best Regards,
Hao Wu

From: Tyler J Erickson [mailto:tyler.j.erickson at seagate.com]
Sent: Wednesday, September 04, 2019 11:07 PM
To: Wu, Hao A
Cc: devel at edk2.groups.io; Ni, Ray
Subject: Re: [PATCH v1 1/1] MdeModulePkg/NvmExpressDxe: Allow other NSIDs for Admin commands

Hi Hao,

I tried making both the NamespaceID and NSID values the same when calling the passthru function for these admin commands and it didn't work. I think that is due to another place in the passthru code filtering the NamespaceId input values on line 517-520.
The NamespaceId parameter is being checked to make sure it isn't greater than the number of supported namespaces by the controller and it makes sure it isn't set to (UINT32)-1 (All F's).

[Hao]: I think the check on line 517-520 blocks ‘NamespaceId’ with value greater than the number of namespace. But it allows the value to be MAX_UINT32, which means the command takes effect on all namespaces.

I think this is correct since the NamespaceId input is what is discovered when calling the EFI_NVM_EXPRESS_PASS_THRU_GET_NEXT_NAMESPACE function. This is what I used to get the available namespaces available in the system.

In my case I'm sending some commands in my application with the NSID set to UINT32_MAX in order to request controller wide SMART/Health log data among other things. There are some commands where setting the NSID to another value may also be useful. For example, DST can use the NSID in the command to change between testing only the controller (0), testing all namespaces (UINT32_MAX), and a specific namespace.

[Hao]: Yes. Just as you said, commands like DST or Get Log Page will have different target when different Namespace values are provided.
I think for your case, you can:

1.       Set both the 'NamespaceId' parameter and 'Nsid' field to 0 if the target is the controller;

2.       Set both of them MAX_UINT32 if the target is all the namespaces;

3.       Set both of them to a corresponding ID if the target is a specific namespace.

As you can see from the current implementation of NvmExpressPassThru() function, the 'NamespaceId' parameter does not affect the construct of the submission queue item.
The 'NamespaceId' parameter only serves as a valid check for the 'Nsid' field in the EFI_NVM_EXPRESS_COMMAND structure.

The modification I made was done where the passthru command's NSID was actually being checked, which seemed like the best place to add this exception for admin commands.

-Tyler

On Tue, Sep 3, 2019 at 9:39 PM Wu, Hao A <hao.a.wu at intel.com<mailto:hao.a.wu at intel.com>> wrote:
> -----Original Message-----
> From: Wu, Hao A
> Sent: Wednesday, September 04, 2019 11:39 AM
> To: devel at edk2.groups.io<mailto:devel at edk2.groups.io>; Tyler Erickson
> Cc: Wu, Hao A; Ni, Ray
> Subject: [PATCH v1 1/1] MdeModulePkg/NvmExpressDxe: Allow other NSIDs
> for Admin commands
>
> Repost the mail to the list.
>
> Best Regards,
> Hao Wu
>
> -----Original Message-----
> From: Tyler Erickson [mailto:tyler.j.erickson at seagate.com<mailto:tyler.j.erickson at seagate.com>]
> Sent: Tuesday, September 03, 2019 9:55 PM
> To: edk2-devel at lists.01.org<mailto:edk2-devel at lists.01.org>
> Cc: Wu, Hao A; Ni, Ray
> Subject: [PATCH v1 1/1] MdeModulePkg/NvmExpressDxe: Allow other NSIDs
> for Admin commands
>
> Cc: Hao A Wu <hao.a.wu at intel.com<mailto:hao.a.wu at intel.com>>
> Cc: Ray Ni <ray.ni at intel.com<mailto:ray.ni at intel.com>>
> Signed-off-by: Tyler Erickson <tyler.j.erickson at seagate.com<mailto:tyler.j.erickson at seagate.com>>
> ---
>  MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressPassthru.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressPassthru.c
> b/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressPassthru.c
> index 8e721379466a..78a3c663ded4 100644
> --- a/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressPassthru.c
> +++ b/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressPassthru.c
> @@ -561,7 +561,7 @@ NvmExpressPassThru (
>    Sq  = Private->SqBuffer[QueueId] + Private->SqTdbl[QueueId].Sqt;
>    Cq  = Private->CqBuffer[QueueId] + Private->CqHdbl[QueueId].Cqh;
>
> -  if (Packet->NvmeCmd->Nsid != NamespaceId) {
> +  if (Packet->QueueType != NVME_ADMIN_QUEUE && Packet->NvmeCmd-
> >Nsid != NamespaceId) {

Hello,

Per my understanding to the codes, I think the:

* Input parameter 'NamespaceId' for the PassThru() service
* The 'Nsid' field of the EFI_NVM_EXPRESS_COMMAND

are of the same meaning.

Do you think setting these 2 values identical when calling the PassThru()
service can resolve the issue you met?

Best Regards,
Hao Wu

>      return EFI_INVALID_PARAMETER;
>    }
>
> --
> 2.17.1

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