linux-kernel - Re: [PATCH v4 4/5] scsi: hisi_sas: Add support for DIF feature for v3 hw

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Message-ID: <yq11s6flde1.fsf@oracle.com>
Date:   Mon, 17 Dec 2018 22:31:02 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     John Garry <john.garry@...wei.com>
Cc:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        <jejb@...ux.vnet.ibm.com>, <linuxarm@...wei.com>,
        <linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        Xiang Chen <chenxiang66@...ilicon.com>
Subject: Re: [PATCH v4 4/5] scsi: hisi_sas: Add support for DIF feature for v3 hw


John,

> We have an issue with using scsi_transfer_length().
>
> As I understand, for our controller we need to set the host structure
> data transfer size to the size of data to write to the disk for WRITE
> type command, and at size of info received to host memory for READ
> type command. As such, for READ STRIP, we only want the SCSI buf len,
> and not the scsi buf len and PI (this is what scsi_transfer_length()
> provides).

Interesting asymmetry.

-- 
Martin K. Petersen	Oracle Linux Engineering