From e2a4f55c6498b59a17a85a1bb6db122a993ffe02 Mon Sep 17 00:00:00 2001 From: Sagi Grimberg Date: Wed, 11 Jun 2014 12:09:59 +0300 Subject: [PATCH] TARGET/sbc,loopback: Adjust command data length in case pi exists on the wire 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 Cc: stable@vger.kernel.org # 3.15+ Signed-off-by: Nicholas Bellinger --- 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 c886ad1c39fb..1f4c015e9078 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 1d3a626bf24f..bd78d9235ac6 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -647,8 +647,19 @@ 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;