linux-kernel - Re: [RFC PATCH v3 1/4] ufs: core: prepare ufs for multi circular queue support

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Date:   Thu, 08 Sep 2022 10:23:20 +0200
From:   Bean Huo <huobean@...il.com>
To:     "Asutosh Das (asd)" <quic_asutoshd@...cinc.com>,
        quic_nguyenb@...cinc.com, quic_xiaosenh@...cinc.com,
        stanley.chu@...iatek.com, adrian.hunter@...el.com,
        bvanassche@....org, avri.altman@....com, mani@...nel.org,
        quic_cang@...cinc.com, beanhuo@...ron.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org
Cc:     linux-arm-msm@...r.kernel.org,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v3 1/4] ufs: core: prepare ufs for multi circular
 queue support

On Wed, 2022-09-07 at 20:00 -0700, Asutosh Das (asd) wrote:
> > > ufshcd_lrb *lrbp, u8 upiu_flags)
> > >           /* command descriptor fields */
> > >           ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
> > >                                   UPIU_TRANSACTION_COMMAND,
> > > upiu_flags,
> > > -                               lrbp->lun, lrbp->task_tag);
> > > +                               lrbp->lun, lrbp->task_tag &
> > > 0xff);
> > >           ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
> > > -                               UPIU_COMMAND_SET_TYPE_SCSI, 0, 0,
> > > 0);
> > > +                               UPIU_COMMAND_SET_TYPE_SCSI, 0, 0,
> > > +                               (lrbp->task_tag & 0xf00) << 4);
> > >    
> > 
> > Are you sure here "(lrbp->task_tag & 0xf00) << 4" is correct?
> > 
> EXT_IID is the higher nibble in DWORD1. So this looks correct to me.
> 
> COMMAND UPIU
> 0           1     2     3
> xx000001b Flags LUN Task Tag
> 4                       5       6       7
> IID Command Set Type Reserved Reserved EXT_IID | Reserved

Hi Asutosh,

yes, [7:4] of byte 7 in UPIU header for host to device UPIUs EXT_IID,
this is correct.

but I think byte7 should be  (lrbp->task_tag & 0xf00) >> 4); rather
than "<< 4"

or what I missundersood.


Kind regards,
Bean