linux-kernel - Re: [PATCH v3 01/16] nvmet: report ioccsz and iorcsz for disc ctrl

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Date: Tue, 19 Dec 2023 08:24:58 +0100
From: Hannes Reinecke <hare@...e.de>
To: Daniel Wagner <dwagner@...e.de>, linux-nvme@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
 Sagi Grimberg <sagi@...mberg.me>, Keith Busch <kbusch@...nel.org>,
 James Smart <james.smart@...adcom.com>
Subject: Re: [PATCH v3 01/16] nvmet: report ioccsz and iorcsz for disc ctrl

On 12/18/23 16:30, Daniel Wagner wrote:
> The host started to verify the ioccsz and iorcsz values. I/O controllers
> return valid values but not the discovery controllers. Use the same
> values as for I/O controllers.
> 
> Fixes: 2fcd3ab39826 ("nvme-fabrics: check ioccsz and iorcsz")
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>   drivers/nvme/target/discovery.c | 13 +++++++++++++
>   1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/nvme/target/discovery.c b/drivers/nvme/target/discovery.c
> index 668d257fa986..e3c4d247dd23 100644
> --- a/drivers/nvme/target/discovery.c
> +++ b/drivers/nvme/target/discovery.c
> @@ -249,6 +249,7 @@ static void nvmet_execute_disc_identify(struct nvmet_req *req)
>   {
>   	struct nvmet_ctrl *ctrl = req->sq->ctrl;
>   	struct nvme_id_ctrl *id;
> +	u32 cmd_capsule_size;
>   	u16 status = 0;
>   
>   	if (!nvmet_check_transfer_len(req, NVME_IDENTIFY_DATA_SIZE))
> @@ -294,6 +295,18 @@ static void nvmet_execute_disc_identify(struct nvmet_req *req)
>   
>   	strscpy(id->subnqn, ctrl->subsys->subsysnqn, sizeof(id->subnqn));
>   
> +	/*
> +	 * Max command capsule size is sqe + in-capsule data size.

'is sqe size + in-capsule data size'

> +	 * Disable in-capsule data for Metadata capable controllers.
> +	 */
> +	cmd_capsule_size = sizeof(struct nvme_command);
> +	if (!ctrl->pi_support)
> +		cmd_capsule_size += req->port->inline_data_size;
> +	id->ioccsz = cpu_to_le32(cmd_capsule_size / 16);

Why the division by 16?

> +
> +	/* Max response capsule size is cqe */
'is cqe size'

> +	id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
> +
>   	status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
>   
>   	kfree(id);

Otherwise looks good.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
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