linux-kernel - Re: [PATCH v3 RFC 2/2] nvme: improve performance for virtual NVMe devices

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Date:	Tue, 16 Aug 2016 13:45:03 -0700
From:	J Freyensee <james_p_freyensee@...ux.intel.com>
To:	Helen Koike <helen.koike@...labora.co.uk>, hch@...radead.org,
	mlin@...nel.org, fes@...gle.com, keith.busch@...el.com,
	rlnelson@...gle.com, axboe@...com, digitaleric@...gle.com,
	tytso@....edu, mikew@...gle.com, monish@...gle.com
Cc:	open list <linux-kernel@...r.kernel.org>,
	"open list:NVM EXPRESS DRIVER" <linux-nvme@...ts.infradead.org>,
	"Huffman, Amber" <amber.huffman@...el.com>,
	"Minturn, Dave B" <dave.b.minturn@...el.com>
Subject: Re: [PATCH v3 RFC 2/2] nvme: improve performance for virtual NVMe
 devices

On Mon, 2016-08-15 at 22:41 -0300, Helen Koike wrote:


>  
> +struct nvme_doorbell_memory {
> +	__u8			opcode;
> +	__u8			flags;
> +	__u16			command_id;
> +	__u32			rsvd1[5];
> +	__le64			prp1;
> +	__le64			prp2;
> +	__u32			rsvd12[6];
> +};
> +
>  struct nvme_command {
>  	union {
>  		struct nvme_common_command common;
> @@ -845,6 +858,7 @@ struct nvme_command {
>  		struct nvmf_connect_command connect;
>  		struct nvmf_property_set_command prop_set;
>  		struct nvmf_property_get_command prop_get;
> +		struct nvme_doorbell_memory doorbell_memory;
>  	};
>  };

This looks like a new NVMe command being introduced, not found in the
latest NVMe specs (NVMe 1.2.1 spec or NVMe-over-Fabrics 1.0 spec)?

This is a big NACK, the command needs to be part of the NVMe standard
before adding it to the NVMe code base (this is exactly how NVMe-over-
Fabrics standard got implemented).  I would bring your proposal to
nvmexpress.org.

Jay


>  
> @@ -934,6 +948,9 @@ enum {
>  	/*
>  	 * Media and Data Integrity Errors:
>  	 */
> +#ifdef CONFIG_NVME_VDB
> +	NVME_SC_DOORBELL_MEMORY_INVALID	= 0x1C0,
> +#endif
>  	NVME_SC_WRITE_FAULT		= 0x280,
>  	NVME_SC_READ_ERROR		= 0x281,
>  	NVME_SC_GUARD_CHECK		= 0x282,