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Petersen" , , , , , Xiang Chen Subject: Re: [PATCH v4 4/5] scsi: hisi_sas: Add support for DIF feature for v3 hw From: "Martin K. Petersen" Organization: Oracle Corporation References: <1544103284-100497-1-git-send-email-john.garry@huawei.com> <1544103284-100497-5-git-send-email-john.garry@huawei.com> <4752be71-f39c-ac55-0e51-36c146108a38@huawei.com> Date: Mon, 17 Dec 2018 22:31:02 -0500 In-Reply-To: (John Garry's message of "Mon, 17 Dec 2018 14:51:36 +0000") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9110 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=532 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1812180028 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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