[PATCH 03/14] target/sbc: Add sbc_check_prot + update sbc_parse_cdb for DIF

[Nicholas A. Bellinger]

From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

This patch adds sbc_check_prot() for performing various DIF
related CDB sanity checks, along with setting SCF_PROT 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.

Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Sagi Grimberg <sagig@xxxxxxxxxxxx>
Cc: Or Gerlitz <ogerlitz@xxxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
 drivers/target/target_core_sbc.c |   39 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 52ae54e..600ffcb 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -563,6 +563,27 @@ sbc_compare_and_write(struct se_cmd *cmd)
 	return TCM_NO_SENSE;
 }
 
+bool
+sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
+{
+	if (!dev->dev_attrib.pi_prot_type)
+		return true;
+
+	if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT &&
+	   (cdb[1] & 0xe0))
+		return false;
+
+	if (!(cdb[1] & 0xe0)) {
+		pr_warn("Target: Unprotected READ/WRITE to DIF device\n");
+		return true;
+	}
+	if (!cmd->t_prot_sg || !cmd->t_prot_nents)
+		return true;
+
+	cmd->se_cmd_flags |= SCF_PROT;
+	return true;
+}
+
 sense_reason_t
 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 {
@@ -581,6 +602,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 		cmd->execute_cmd = sbc_execute_rw;
 		break;
 	case READ_10:
+		if (!sbc_check_prot(dev, cmd, cdb))
+			return TCM_UNSUPPORTED_SCSI_OPCODE;
+
 		sectors = transport_get_sectors_10(cdb);
 		cmd->t_task_lba = transport_lba_32(cdb);
 		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
@@ -588,6 +612,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 		cmd->execute_cmd = sbc_execute_rw;
 		break;
 	case READ_12:
+		if (!sbc_check_prot(dev, cmd, cdb))
+			return TCM_UNSUPPORTED_SCSI_OPCODE;
+
 		sectors = transport_get_sectors_12(cdb);
 		cmd->t_task_lba = transport_lba_32(cdb);
 		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
@@ -595,6 +622,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 		cmd->execute_cmd = sbc_execute_rw;
 		break;
 	case READ_16:
+		if (!sbc_check_prot(dev, cmd, cdb))
+			return TCM_UNSUPPORTED_SCSI_OPCODE;
+
 		sectors = transport_get_sectors_16(cdb);
 		cmd->t_task_lba = transport_lba_64(cdb);
 		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
@@ -610,6 +640,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 		break;
 	case WRITE_10:
 	case WRITE_VERIFY:
+		if (!sbc_check_prot(dev, cmd, cdb))
+			return TCM_UNSUPPORTED_SCSI_OPCODE;
+
 		sectors = transport_get_sectors_10(cdb);
 		cmd->t_task_lba = transport_lba_32(cdb);
 		if (cdb[1] & 0x8)
@@ -619,6 +652,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 		cmd->execute_cmd = sbc_execute_rw;
 		break;
 	case WRITE_12:
+		if (!sbc_check_prot(dev, cmd, cdb))
+			return TCM_UNSUPPORTED_SCSI_OPCODE;
+
 		sectors = transport_get_sectors_12(cdb);
 		cmd->t_task_lba = transport_lba_32(cdb);
 		if (cdb[1] & 0x8)
@@ -628,6 +664,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 		cmd->execute_cmd = sbc_execute_rw;
 		break;
 	case WRITE_16:
+		if (!sbc_check_prot(dev, cmd, cdb))
+			return TCM_UNSUPPORTED_SCSI_OPCODE;
+
 		sectors = transport_get_sectors_16(cdb);
 		cmd->t_task_lba = transport_lba_64(cdb);
 		if (cdb[1] & 0x8)
-- 
1.7.10.4

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