Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932409AbaF1RxO (ORCPT ); Sat, 28 Jun 2014 13:53:14 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:54436 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756163AbaF1RxH (ORCPT ); Sat, 28 Jun 2014 13:53:07 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sagi Grimberg , Nicholas Bellinger Subject: [PATCH 3.15 100/139] TARGET/sbc,loopback: Adjust command data length in case pi exists on the wire Date: Sat, 28 Jun 2014 10:47:41 -0700 Message-Id: <20140628174609.976607067@linuxfoundation.org> X-Mailer: git-send-email 2.0.1 In-Reply-To: <20140628174605.352098823@linuxfoundation.org> References: <20140628174605.352098823@linuxfoundation.org> User-Agent: quilt/0.63-1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sagi Grimberg commit e2a4f55c6498b59a17a85a1bb6db122a993ffe02 upstream. 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 Signed-off-by: Nicholas Bellinger Signed-off-by: Greg Kroah-Hartman --- drivers/target/loopback/tcm_loop.c | 15 ++++++++++++--- drivers/target/target_core_sbc.c | 15 +++++++++++++-- 2 files changed, 25 insertions(+), 5 deletions(-) --- a/drivers/target/loopback/tcm_loop.c +++ b/drivers/target/loopback/tcm_loop.c @@ -179,7 +179,7 @@ static void tcm_loop_submission_work(str 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(str } - 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, --- 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, st 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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/