linux-kernel - Re: [PATCH 1/2] scsi: ufs: Add Multi-Circular Queue support

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Message-ID: <f93045ec-569c-bd09-3617-d7d7aca4e5cd@huawei.com>
Date:   Thu, 28 Jul 2022 20:10:28 +0100
From:   John Garry <john.garry@...wei.com>
To:     Can Guo <quic_cang@...cinc.com>, <bvanassche@....org>,
        <stanley.chu@...iatek.com>, <adrian.hunter@...el.com>,
        <alim.akhtar@...sung.com>, <avri.altman@....com>,
        <beanhuo@...ron.com>, <quic_asutoshd@...cinc.com>,
        <quic_nguyenb@...cinc.com>, <quic_ziqichen@...cinc.com>,
        <linux-scsi@...r.kernel.org>, <kernel-team@...roid.com>
CC:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Daejun Park <daejun7.park@...sung.com>,
        Jinyoung Choi <j-young.choi@...sung.com>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] scsi: ufs: Add Multi-Circular Queue support

On 19/07/2022 08:01, Can Guo wrote:
> +
> +	hba->nr_queues[HCTX_TYPE_DEFAULT] = num_possible_cpus();
> +	hba->nr_queues[HCTX_TYPE_READ] = 0;
> +	hba->nr_queues[HCTX_TYPE_POLL] = 1;
> +
> +	for (i = 0; i < HCTX_MAX_TYPES; i++)
> +		host->nr_hw_queues += hba->nr_queues[i];
> +
> +	host->can_queue = hba->nutrs;
> +	host->cmd_per_lun = hba->nutrs;
> +
> +	/* One more reserved for dev_cmd_queue */
> +	hba->nr_hw_queues = host->nr_hw_queues + 1;
> +

So this would mean that the host can accept .can_queue * .nr_hw_queues 
numbers of requests simultaneously - is that true?

thanks,
John