From patchwork Wed Jun 11 09:09:59 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sagi Grimberg X-Patchwork-Id: 4334871 Return-Path: X-Original-To: patchwork-linux-rdma@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id CB6129F505 for ; Wed, 11 Jun 2014 09:15:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EFE22201DE for ; Wed, 11 Jun 2014 09:15:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F3CC9202DD for ; Wed, 11 Jun 2014 09:15:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755734AbaFKJPQ (ORCPT ); Wed, 11 Jun 2014 05:15:16 -0400 Received: from mailp.voltaire.com ([193.47.165.129]:45631 "EHLO mellanox.co.il" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1755403AbaFKJPN (ORCPT ); Wed, 11 Jun 2014 05:15:13 -0400 Received: from Internal Mail-Server by MTLPINE1 (envelope-from sagig@mellanox.com) with SMTP; 11 Jun 2014 12:10:03 +0300 Received: from r-vnc05.mtr.labs.mlnx (r-vnc05.mtr.labs.mlnx [10.208.0.115]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id s5B9A2vQ005363; Wed, 11 Jun 2014 12:10:02 +0300 Received: from r-vnc05.mtr.labs.mlnx (localhost [127.0.0.1]) by r-vnc05.mtr.labs.mlnx (8.14.4/8.14.4) with ESMTP id s5B9A2YG025291; Wed, 11 Jun 2014 12:10:02 +0300 Received: (from sagig@localhost) by r-vnc05.mtr.labs.mlnx (8.14.4/8.14.4/Submit) id s5B9A263025290; Wed, 11 Jun 2014 12:10:02 +0300 From: Sagi Grimberg To: michaelc@cs.wisc.edu, martin.petersen@oracle.com, nab@linux-iscsi.org, roland@kernel.org Cc: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-rdma@vger.kernel.org Subject: [PATCH v2 3/3] TARGET/sbc, loopback: Adjust command data length in case pi exists on the wire Date: Wed, 11 Jun 2014 12:09:59 +0300 Message-Id: <1402477799-24610-4-git-send-email-sagig@mellanox.com> X-Mailer: git-send-email 1.8.4.3 In-Reply-To: <1402477799-24610-1-git-send-email-sagig@mellanox.com> References: <1402477799-24610-1-git-send-email-sagig@mellanox.com> Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In various areas of the code, it is assumed that se_cmd->data_length describes pure data. In case that protection information exists over the wire (protect bits is are on) the target core re-calculates the data length from the CDB and the backed device block size (instead of each transport peeking in the cdb). Modify loopback device to include protection information in the transferred data length (like other scsi transports). Signed-off-by: Sagi Grimberg --- drivers/target/loopback/tcm_loop.c | 15 ++++++++++++--- drivers/target/target_core_sbc.c | 15 +++++++++++++-- 2 files changed, 25 insertions(+), 5 deletions(-) diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c index c886ad1..1f4c015 100644 --- a/drivers/target/loopback/tcm_loop.c +++ b/drivers/target/loopback/tcm_loop.c @@ -179,7 +179,7 @@ static void tcm_loop_submission_work(struct work_struct *work) struct tcm_loop_hba *tl_hba; struct tcm_loop_tpg *tl_tpg; struct scatterlist *sgl_bidi = NULL; - u32 sgl_bidi_count = 0; + u32 sgl_bidi_count = 0, transfer_length; int rc; tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); @@ -213,12 +213,21 @@ static void tcm_loop_submission_work(struct work_struct *work) } - if (!scsi_prot_sg_count(sc) && scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) + transfer_length = scsi_transfer_length(sc); + if (!scsi_prot_sg_count(sc) && + scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) { se_cmd->prot_pto = true; + /* + * loopback transport doesn't support + * WRITE_GENERATE, READ_STRIP protection + * information operations, go ahead unprotected. + */ + transfer_length = scsi_bufflen(sc); + } rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd, &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun, - scsi_bufflen(sc), tcm_loop_sam_attr(sc), + transfer_length, tcm_loop_sam_attr(sc), sc->sc_data_direction, 0, scsi_sglist(sc), scsi_sg_count(sc), sgl_bidi, sgl_bidi_count, diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index e022959..4b5716f 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -665,8 +665,19 @@ sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, cmd->prot_type = dev->dev_attrib.pi_prot_type; cmd->prot_length = dev->prot_length * sectors; - pr_debug("%s: prot_type=%d, prot_length=%d prot_op=%d prot_checks=%d\n", - __func__, cmd->prot_type, cmd->prot_length, + + /** + * In case protection information exists over the wire + * we modify command data length to describe pure data. + * The actual transfer length is data length + protection + * length + **/ + if (protect) + cmd->data_length = sectors * dev->dev_attrib.block_size; + + pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " + "prot_op=%d prot_checks=%d\n", + __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, cmd->prot_op, cmd->prot_checks); return true;