linux-kernel - Re: [PATCH v4 1/8] nvme-fc: Update hardware queues before using them

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Date:   Mon, 2 Aug 2021 14:34:11 -0500
From:   Himanshu Madhani <himanshu.madhani@...cle.com>
To:     Daniel Wagner <dwagner@...e.de>, linux-nvme@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org,
        James Smart <james.smart@...adcom.com>,
        Keith Busch <kbusch@...nel.org>,
        Ming Lei <ming.lei@...hat.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Hannes Reinecke <hare@...e.de>,
        Wen Xiong <wenxiong@...ibm.com>,
        James Smart <jsmart2021@...il.com>
Subject: Re: [PATCH v4 1/8] nvme-fc: Update hardware queues before using them



On 8/2/21 6:26 AM, Daniel Wagner wrote:
> In case the number of hardware queues changes, do the update the
> tagset and ctx to hctx first before using the mapping to recreate and
> connnect the IO queues.
> 
> Reviewed-by: James Smart <jsmart2021@...il.com>
> Reviewed-by: Ming Lei <ming.lei@...hat.com>
> Reviewed-by: Hannes Reinecke <hare@...e.de>
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>   drivers/nvme/host/fc.c | 16 ++++++++--------
>   1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
> index 7f462af1b02a..8a903769364f 100644
> --- a/drivers/nvme/host/fc.c
> +++ b/drivers/nvme/host/fc.c
> @@ -2951,14 +2951,6 @@ nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl)
>   	if (ctrl->ctrl.queue_count == 1)
>   		return 0;
>   
> -	ret = nvme_fc_create_hw_io_queues(ctrl, ctrl->ctrl.sqsize + 1);
> -	if (ret)
> -		goto out_free_io_queues;
> -
> -	ret = nvme_fc_connect_io_queues(ctrl, ctrl->ctrl.sqsize + 1);
> -	if (ret)
> -		goto out_delete_hw_queues;
> -
>   	if (prior_ioq_cnt != nr_io_queues) {
>   		dev_info(ctrl->ctrl.device,
>   			"reconnect: revising io queue count from %d to %d\n",
> @@ -2968,6 +2960,14 @@ nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl)
>   		nvme_unfreeze(&ctrl->ctrl);
>   	}
>   
> +	ret = nvme_fc_create_hw_io_queues(ctrl, ctrl->ctrl.sqsize + 1);
> +	if (ret)
> +		goto out_free_io_queues;
> +
> +	ret = nvme_fc_connect_io_queues(ctrl, ctrl->ctrl.sqsize + 1);
> +	if (ret)
> +		goto out_delete_hw_queues;
> +
>   	return 0;
>   
>   out_delete_hw_queues:
> 

Reviewed-by: Himanshu Madhani <himanshu.madhani@...cle.com>

-- 
Himanshu Madhani                                Oracle Linux Engineering