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authorNicholas Bellinger <nab@linux-iscsi.org>2013-12-23 20:30:03 +0000
committerNicholas Bellinger <nab@linux-iscsi.org>2014-01-18 09:53:11 +0000
commit499bf77b0169605a23c38351e3849066fe696877 (patch)
treefbe3e65676dd452c29bf1ac82ba97479579a5a32 /drivers
parentfcc4f17b9ce931c93ce08f8cf27d6bd010f0b1ef (diff)
downloadlinux-499bf77b0169605a23c38351e3849066fe696877.tar.bz2
target/sbc: Add DIF setup in sbc_check_prot + sbc_parse_cdb
This patch adds sbc_check_prot() for performing various DIF related CDB sanity checks, along with setting cmd->prot_type once sanity checks have passed. Also, add calls in sbc_parse_cdb() for READ_[10,12,16] + WRITE_[10,12,16] to perform DIF sanity checking. v2 changes: - Make sbc_check_prot defined as static (Fengguang + Wei) - Remove unprotected READ/WRITE warning (mkp) - Populate cmd->prot_type + friends (Sagi) - Drop SCF_PROT usage Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/target/target_core_sbc.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 6863dbe0aadf..91a92f354e9f 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -563,6 +563,44 @@ sbc_compare_and_write(struct se_cmd *cmd)
return TCM_NO_SENSE;
}
+static bool
+sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
+ u32 sectors)
+{
+ if (!cmd->t_prot_sg || !cmd->t_prot_nents)
+ return true;
+
+ switch (dev->dev_attrib.pi_prot_type) {
+ case TARGET_DIF_TYPE3_PROT:
+ if (!(cdb[1] & 0xe0))
+ return true;
+
+ cmd->reftag_seed = 0xffffffff;
+ break;
+ case TARGET_DIF_TYPE2_PROT:
+ if (cdb[1] & 0xe0)
+ return false;
+
+ cmd->reftag_seed = cmd->t_task_lba;
+ break;
+ case TARGET_DIF_TYPE1_PROT:
+ if (!(cdb[1] & 0xe0))
+ return true;
+
+ cmd->reftag_seed = cmd->t_task_lba;
+ break;
+ case TARGET_DIF_TYPE0_PROT:
+ default:
+ return true;
+ }
+
+ cmd->prot_type = dev->dev_attrib.pi_prot_type;
+ cmd->prot_length = dev->prot_length * sectors;
+ cmd->prot_handover = PROT_SEPERATED;
+
+ return true;
+}
+
sense_reason_t
sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
{
@@ -583,6 +621,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case READ_10:
sectors = transport_get_sectors_10(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
cmd->execute_rw = ops->execute_rw;
cmd->execute_cmd = sbc_execute_rw;
@@ -590,6 +632,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case READ_12:
sectors = transport_get_sectors_12(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
cmd->execute_rw = ops->execute_rw;
cmd->execute_cmd = sbc_execute_rw;
@@ -597,6 +643,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case READ_16:
sectors = transport_get_sectors_16(cdb);
cmd->t_task_lba = transport_lba_64(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
cmd->execute_rw = ops->execute_rw;
cmd->execute_cmd = sbc_execute_rw;
@@ -612,6 +662,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case WRITE_VERIFY:
sectors = transport_get_sectors_10(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
if (cdb[1] & 0x8)
cmd->se_cmd_flags |= SCF_FUA;
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
@@ -621,6 +675,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case WRITE_12:
sectors = transport_get_sectors_12(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
if (cdb[1] & 0x8)
cmd->se_cmd_flags |= SCF_FUA;
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
@@ -630,6 +688,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case WRITE_16:
sectors = transport_get_sectors_16(cdb);
cmd->t_task_lba = transport_lba_64(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
if (cdb[1] & 0x8)
cmd->se_cmd_flags |= SCF_FUA;
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;