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-rw-r--r--drivers/scsi/scsi_error.c3
-rw-r--r--include/scsi/scsi_cmnd.h66
-rw-r--r--include/scsi/scsi_eh.h1
3 files changed, 70 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 006a95916f72..a69397fd314a 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -664,7 +664,9 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
ses->sdb = scmd->sdb;
ses->next_rq = scmd->request->next_rq;
ses->result = scmd->result;
+ ses->prot_op = scmd->prot_op;
+ scmd->prot_op = SCSI_PROT_NORMAL;
scmd->cmnd = ses->eh_cmnd;
memset(scmd->cmnd, 0, BLK_MAX_CDB);
memset(&scmd->sdb, 0, sizeof(scmd->sdb));
@@ -722,6 +724,7 @@ void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
scmd->sdb = ses->sdb;
scmd->request->next_rq = ses->next_rq;
scmd->result = ses->result;
+ scmd->prot_op = ses->prot_op;
}
EXPORT_SYMBOL(scsi_eh_restore_cmnd);
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 66c944849d6b..402c1078d01c 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -77,6 +77,9 @@ struct scsi_cmnd {
int allowed;
int timeout_per_command;
+ unsigned char prot_op;
+ unsigned char prot_type;
+
unsigned short cmd_len;
enum dma_data_direction sc_data_direction;
@@ -208,4 +211,67 @@ static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
buf, buflen);
}
+/*
+ * The operations below are hints that tell the controller driver how
+ * to handle I/Os with DIF or similar types of protection information.
+ */
+enum scsi_prot_operations {
+ /* Normal I/O */
+ SCSI_PROT_NORMAL = 0,
+
+ /* OS-HBA: Protected, HBA-Target: Unprotected */
+ SCSI_PROT_READ_INSERT,
+ SCSI_PROT_WRITE_STRIP,
+
+ /* OS-HBA: Unprotected, HBA-Target: Protected */
+ SCSI_PROT_READ_STRIP,
+ SCSI_PROT_WRITE_INSERT,
+
+ /* OS-HBA: Protected, HBA-Target: Protected */
+ SCSI_PROT_READ_PASS,
+ SCSI_PROT_WRITE_PASS,
+
+ /* OS-HBA: Protected, HBA-Target: Protected, checksum conversion */
+ SCSI_PROT_READ_CONVERT,
+ SCSI_PROT_WRITE_CONVERT,
+};
+
+static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
+{
+ scmd->prot_op = op;
+}
+
+static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
+{
+ return scmd->prot_op;
+}
+
+/*
+ * The controller usually does not know anything about the target it
+ * is communicating with. However, when DIX is enabled the controller
+ * must be know target type so it can verify the protection
+ * information passed along with the I/O.
+ */
+enum scsi_prot_target_type {
+ SCSI_PROT_DIF_TYPE0 = 0,
+ SCSI_PROT_DIF_TYPE1,
+ SCSI_PROT_DIF_TYPE2,
+ SCSI_PROT_DIF_TYPE3,
+};
+
+static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
+{
+ scmd->prot_type = type;
+}
+
+static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
+{
+ return scmd->prot_type;
+}
+
+static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
+{
+ return scmd->request->sector;
+}
+
#endif /* _SCSI_SCSI_CMND_H */
diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h
index 2a9add21267d..e5499ed0e376 100644
--- a/include/scsi/scsi_eh.h
+++ b/include/scsi/scsi_eh.h
@@ -75,6 +75,7 @@ struct scsi_eh_save {
int result;
enum dma_data_direction data_direction;
unsigned char cmd_len;
+ unsigned char prot_op;
unsigned char *cmnd;
struct scsi_data_buffer sdb;
struct request *next_rq;