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

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Date:   Thu, 28 Jul 2022 13:00:30 -0700
From:   "Asutosh Das (asd)" <quic_asutoshd@...cinc.com>
To:     Bart Van Assche <bvanassche@....org>,
        Can Guo <quic_cang@...cinc.com>, <stanley.chu@...iatek.com>,
        <adrian.hunter@...el.com>, <alim.akhtar@...sung.com>,
        <avri.altman@....com>, <beanhuo@...ron.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 7/28/2022 12:38 PM, Bart Van Assche wrote:
> On 7/19/22 00:01, Can Guo wrote:
>>   static int ufshcd_map_queues(struct Scsi_Host *shost)
>>   {
>> -    int i, ret;
>> +    int i, queue_offset = 0, ret;
>> +    struct ufs_hba *hba = shost_priv(shost);
>>       for (i = 0; i < shost->nr_maps; i++) {
>>           struct blk_mq_queue_map *map = &shost->tag_set.map[i];
>> -        switch (i) {
>> -        case HCTX_TYPE_DEFAULT:
>> -        case HCTX_TYPE_POLL:
>> -            map->nr_queues = 1;
>> -            break;
>> -        case HCTX_TYPE_READ:
>> -            map->nr_queues = 0;
>> +        map->nr_queues = hba->nr_queues[i];
>> +        if (!map->nr_queues)
>>               continue;
>> -        default:
>> -            WARN_ON_ONCE(true);
>> -        }
>> -        map->queue_offset = 0;
>> +
>> +        map->queue_offset = queue_offset;
>> +        if (i == HCTX_TYPE_POLL && !is_mcq_enabled(hba))
>> +            map->queue_offset = 0;
>> +
>>           ret = blk_mq_map_queues(map);
>> -        WARN_ON_ONCE(ret);
>> +
>> +        if (ret)
>> +            return ret;
>> +
>> +        queue_offset += map->nr_queues;
>>       }
> 
> It is not clear to me why the WARN_ON_ONCE(ret) statement has been 
> changed into "if (ret) return ret;"?
> 
Looks like blk_mq_map_queues() only returns 0.
Will remove the if (ret) return ret statement in the next version.

> Thanks,
> 
> Bart.