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Message-ID: <f93045ec-569c-bd09-3617-d7d7aca4e5cd@huawei.com>
Date:   Thu, 28 Jul 2022 20:10:28 +0100
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Subject: Re: [PATCH 1/2] scsi: ufs: Add Multi-Circular Queue support
To:     Can Guo <quic_cang@quicinc.com>, <bvanassche@acm.org>,
        <stanley.chu@mediatek.com>, <adrian.hunter@intel.com>,
        <alim.akhtar@samsung.com>, <avri.altman@wdc.com>,
        <beanhuo@micron.com>, <quic_asutoshd@quicinc.com>,
        <quic_nguyenb@quicinc.com>, <quic_ziqichen@quicinc.com>,
        <linux-scsi@vger.kernel.org>, <kernel-team@android.com>
CC:     "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Daejun Park <daejun7.park@samsung.com>,
        Jinyoung Choi <j-young.choi@samsung.com>,
        Kiwoong Kim <kwmad.kim@samsung.com>,
        open list <linux-kernel@vger.kernel.org>
References: <1658214120-22772-1-git-send-email-quic_cang@quicinc.com>
 <1658214120-22772-2-git-send-email-quic_cang@quicinc.com>
From:   John Garry <john.garry@huawei.com>
In-Reply-To: <1658214120-22772-2-git-send-email-quic_cang@quicinc.com>
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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