[PATCH 4/4] nvme: check that EUI/GUID/UUID are globally unique

[Chaitanya Kulkarni]

On 6/8/22 12:04, Keith Busch wrote:
> On Wed, Jun 08, 2022 at 06:11:04PM +0000, Alan Adamson wrote:
>>> On Jun 8, 2022, at 12:52 AM, Christoph Hellwig <hch at lst.de> wrote:
>>
>> How do we get the clear_ids setting from the connect to the target?
> 
> I'm assuming something like this (untested):
> 
> ---
> diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
> index 59024af2da2e..3eaf463d0567 100644
> --- a/drivers/nvme/target/loop.c
> +++ b/drivers/nvme/target/loop.c
> @@ -687,6 +687,7 @@ static void nvme_loop_remove_port(struct nvmet_port *port)
>   static const struct nvmet_fabrics_ops nvme_loop_ops = {
>   	.owner		= THIS_MODULE,
>   	.type		= NVMF_TRTYPE_LOOP,
> +	.flags		= NVMF_CLEAR_NS_DESCS,
>   	.add_port	= nvme_loop_add_port,
>   	.remove_port	= nvme_loop_remove_port,
>   	.queue_response = nvme_loop_queue_response,
> diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
> index 69818752a33a..03ce045af54e 100644
> --- a/drivers/nvme/target/nvmet.h
> +++ b/drivers/nvme/target/nvmet.h
> @@ -300,6 +300,7 @@ struct nvmet_fabrics_ops {
>   	unsigned int flags;
>   #define NVMF_KEYED_SGLS			(1 << 0)
>   #define NVMF_METADATA_SUPPORTED		(1 << 1)
> +#define NVMF_CLEAR_NS_DESCS		(1 << 3)
>   	void (*queue_response)(struct nvmet_req *req);
>   	int (*add_port)(struct nvmet_port *port);
>   	void (*remove_port)(struct nvmet_port *port);
> diff --git a/drivers/nvme/target/passthru.c b/drivers/nvme/target/passthru.c
> index b1f7efab3918..9fa5bc0e26d0 100644
> --- a/drivers/nvme/target/passthru.c
> +++ b/drivers/nvme/target/passthru.c
> @@ -30,6 +30,19 @@ void nvmet_passthrough_override_cap(struct nvmet_ctrl *ctrl)
>   		ctrl->cap &= ~(1ULL << 43);
>   }
>   
> +static u16 nvmet_passthru_override_id_descs(struct nvmet_req *req)
> +{
> +	struct nvmet_ctrl *ctrl = req->sq->ctrl;
> +	u16 ret = NVME_SC_SUCCESS;
> +
> +	if (ctrl->ops->flags & NVMF_CLEAR_NS_DESCS) {
> +		ret = NVME_SC_INVALID_FIELD;
> +		nvmet_zero_sgl(req, 0, 0x1000);
> +	}
> +
> +	return ret;
> +}
> +
>   static u16 nvmet_passthru_override_id_ctrl(struct nvmet_req *req)
>   {
>   	struct nvmet_ctrl *ctrl = req->sq->ctrl;
> @@ -176,6 +189,9 @@ static void nvmet_passthru_execute_cmd_work(struct work_struct *w)
>   		case NVME_ID_CNS_NS:
>   			nvmet_passthru_override_id_ns(req);
>   			break;
> +		case NVME_ID_CNS_NS_DESC_LIST:
> +			nvmet_passthru_override_id_descs(req);
> +			break;
>   		}
>   	} else if (status < 0)
>   		status = NVME_SC_INTERNAL;
> --
> 

this problem exists from early days of passthru,
I think something like will be definitely useful.

Alan, can you give it a test ?

-ck