linux-kernel - Re: [PATCH v7 1/3] nvme-fc: Update hardware queues before using them

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Message-ID: <6C03188F-7715-4DF9-AC7E-52FC975ED214@oracle.com>
Date:   Tue, 14 Sep 2021 13:52:47 +0000
From:   Himanshu Madhani <himanshu.madhani@...cle.com>
To:     Daniel Wagner <dwagner@...e.de>
CC:     "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        Hannes Reinecke <hare@...e.de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>,
        Ming Lei <ming.lei@...hat.com>,
        Wen Xiong <wenxiong@...ibm.com>,
        James Smart <jsmart2021@...il.com>
Subject: Re: [PATCH v7 1/3] nvme-fc: Update hardware queues before using them



> On Sep 14, 2021, at 4:20 AM, Daniel Wagner <dwagner@...e.de> wrote:
> 
> In case the number of hardware queues changes, we need to update the
> tagset and the mapping of ctx to hctx first.
> 
> If we try to create and connect the I/O queues first, this operation
> will fail (target will reject the connect call due to the wrong number
> of queues) and hence we bail out of the recreate function. Then we
> will to try the very same operation again, thus we don't make any
> progress.
> 
> 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 b08a61ca283f..b5d9a5507de5 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:
> -- 
> 2.29.2
> 

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

--
Himanshu Madhani	 Oracle Linux Engineering