linux-kernel - Re: [PATCH v2 4/7] nvme.h: add telemetry log page definisions

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Date:   Tue, 7 May 2019 11:28:16 -0600
From:   "Heitke, Kenneth" <kenneth.heitke@...el.com>
To:     Akinobu Mita <akinobu.mita@...il.com>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Jens Axboe <axboe@...com>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <keith.busch@...el.com>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 4/7] nvme.h: add telemetry log page definisions



On 5/7/2019 10:58 AM, Akinobu Mita wrote:
> Copy telemetry log page definisions from nvme-cli.
> 
> Cc: Johannes Berg <johannes@...solutions.net>
> Cc: Keith Busch <keith.busch@...el.com>
> Cc: Jens Axboe <axboe@...com>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Sagi Grimberg <sagi@...mberg.me>
> Cc: Minwoo Im <minwoo.im.dev@...il.com>
> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
> ---
> * v2
> - New patch in this version.
> 
>   include/linux/nvme.h | 23 +++++++++++++++++++++++
>   1 file changed, 23 insertions(+)
> 
> diff --git a/include/linux/nvme.h b/include/linux/nvme.h
> index c40720c..5217fe4 100644
> --- a/include/linux/nvme.h
> +++ b/include/linux/nvme.h
> @@ -396,6 +396,28 @@ enum {
>   	NVME_NIDT_UUID		= 0x03,
>   };
>   
> +/* Derived from 1.3a Figure 101: Get Log Page – Telemetry Host
> + * -Initiated Log (Log Identifier 07h)
> + */
> +struct nvme_telemetry_log_page_hdr {
> +	__u8    lpi; /* Log page identifier */
> +	__u8    rsvd[4];
> +	__u8    iee_oui[3];
> +	__le16  dalb1; /* Data area 1 last block */
> +	__le16  dalb2; /* Data area 2 last block */
> +	__le16  dalb3; /* Data area 3 last block */
> +	__u8    rsvd1[368]; /* TODO verify */

Remove the TODO

> +	__u8    ctrlavail; /* Controller initiated data avail?*/
> +	__u8    ctrldgn; /* Controller initiated telemetry Data Gen # */
> +	__u8    rsnident[128];
> +	/* We'll have to double fetch so we can get the header,
> +	 * parse dalb1->3 determine how much size we need for the
> +	 * log then alloc below. Or just do a secondary non-struct
> +	 * allocation.
> +	 */

This comment isn't necessary. You usually can't read the entire
telemetry log at once and the header is a fixed size. You would likely
just read the header followed by reads of the different data areas.

> +	__u8    telemetry_dataarea[0];
> +};
> +
>   struct nvme_smart_log {
>   	__u8			critical_warning;
>   	__u8			temperature[2];
> @@ -832,6 +854,7 @@ enum {
>   	NVME_LOG_FW_SLOT	= 0x03,
>   	NVME_LOG_CHANGED_NS	= 0x04,
>   	NVME_LOG_CMD_EFFECTS	= 0x05,
> +	NVME_LOG_TELEMETRY_CTRL	= 0x08,
>   	NVME_LOG_ANA		= 0x0c,
>   	NVME_LOG_DISC		= 0x70,
>   	NVME_LOG_RESERVATION	= 0x80,
>