linux-kernel - Re: [RFC PATCH 2/5] scsi: ufs: Add UFS-feature layer

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Message-ID: <cf01e1d2-50e9-7fa8-b2ee-88a900231304@acm.org>
Date:   Thu, 11 Jun 2020 21:28:34 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     daejun7.park@...sung.com, ALIM AKHTAR <alim.akhtar@...sung.com>,
        "avri.altman@....com" <avri.altman@....com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "tomas.winkler@...el.com" <tomas.winkler@...el.com>
Cc:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sang-yoon Oh <sangyoon.oh@...sung.com>,
        Sung-Jun Park <sungjun07.park@...sung.com>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Jinyoung CHOI <j-young.choi@...sung.com>,
        Adel Choi <adel.choi@...sung.com>,
        BoRam Shin <boram.shin@...sung.com>
Subject: Re: [RFC PATCH 2/5] scsi: ufs: Add UFS-feature layer

On 2020-06-11 19:27, Daejun Park wrote:
>>> @@ -2525,6 +2525,8 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
>>>  
>>>    ufshcd_comp_scsi_upiu(hba, lrbp);
>>>  
>>> +  ufsf_ops_prep_fn(hba, lrbp);
>>> +
>>>    err = ufshcd_map_sg(hba, lrbp);
>>>    if (err) {
>>>      lrbp->cmd = NULL;
> 
>> What happens if a SCSI command is retried and hence ufsf_ops_prep_fn()
>> is called multiple times for the same SCSI command?
>
> Developers of UFS features should implement it so that prep_fn does not have
> any problems even if it processes the same SCSI command multiple times.
> In HPB feature, prep_fn modifies only upiu  structure. So it is ok to call
> it multiple times because the upiu is rebuilt from ufshcd_comp_scsi_upiu().

Please make sure that this expectation is documented somewhere.

Thanks,

Bart.