[SCSI] scsi_transport_sas: support link error attributes

For now supporting the ->get_linkerrors method is mandatory.  I'll
probably be beaten to implement the .show_foo variables and different
types of attributes soon..

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 19 insertions, 4 deletions

diff --git a/include/scsi/scsi_transport_sas.h b/include/scsi/scsi_transport_sas.h
index bc4aeb660dd..38389d8dd56 100644
--- a/include/scsi/scsi_transport_sas.h
+++ b/include/scsi/scsi_transport_sas.h
@@ -41,20 +41,28 @@ struct sas_identify {
 	u8			phy_identifier;
 };
 
-/* The functions by which the transport class and the driver communicate */
-struct sas_function_template {
-};
-
 struct sas_phy {
 	struct device		dev;
 	int			number;
+
+	/* phy identification */
 	struct sas_identify	identify;
+
+	/* phy attributes */
 	enum sas_linkrate	negotiated_linkrate;
 	enum sas_linkrate	minimum_linkrate_hw;
 	enum sas_linkrate	minimum_linkrate;
 	enum sas_linkrate	maximum_linkrate_hw;
 	enum sas_linkrate	maximum_linkrate;
 	u8			port_identifier;
+
+	/* link error statistics */
+	u32			invalid_dword_count;
+	u32			running_disparity_error_count;
+	u32			loss_of_dword_sync_count;
+	u32			phy_reset_problem_count;
+
+	/* the other end of the link */
 	struct sas_rphy		*rphy;
 };
 
@@ -79,6 +87,13 @@ struct sas_rphy {
 #define rphy_to_shost(rphy) \
 	dev_to_shost((rphy)->dev.parent)
 
+
+/* The functions by which the transport class and the driver communicate */
+struct sas_function_template {
+	int (*get_linkerrors)(struct sas_phy *);
+};
+
+
 extern void sas_remove_host(struct Scsi_Host *);
 
 extern struct sas_phy *sas_phy_alloc(struct device *, int);