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-rw-r--r--include/scsi/scsi_cmnd.h86
1 files changed, 86 insertions, 0 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 66c944849d6..f9f6e793575 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;
@@ -87,6 +90,8 @@ struct scsi_cmnd {
/* These elements define the operation we ultimately want to perform */
struct scsi_data_buffer sdb;
+ struct scsi_data_buffer *prot_sdb;
+
unsigned underflow; /* Return error if less than
this amount is transferred */
@@ -208,4 +213,85 @@ 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;
+}
+
+static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
+{
+ return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
+}
+
+static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
+{
+ return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
+}
+
+static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
+{
+ return cmd->prot_sdb;
+}
+
+#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
+ for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
+
#endif /* _SCSI_SCSI_CMND_H */