[SCSI] fc transport: add permanent_port_name fc_host attribute

Add fc_host attribute permanent_port_name which is
used to show the port name of the primary port -
the port that initially logged into the fabric.

For a virtual port (registered via the primary port with
FDISC command) it is useful to know not only its (virtual)
port name but also the permanent port name.
Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/scsi_transport_fc.c

@@ -295,6 +295,7 @@ static int fc_host_setup(struct transport_container *tc, struct device *dev,
 	 */
 	fc_host_node_name(shost) = -1;
 	fc_host_port_name(shost) = -1;
+	fc_host_permanent_port_name(shost) = -1;
 	fc_host_supported_classes(shost) = FC_COS_UNSPECIFIED;
 	memset(fc_host_supported_fc4s(shost), 0,
 		sizeof(fc_host_supported_fc4s(shost)));
@@ -795,6 +796,8 @@ static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
 
 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
+fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
+			     unsigned long long);
 fc_private_host_rd_attr(symbolic_name, "%s\n", (FC_SYMBOLIC_NAME_SIZE +1));
 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
@@ -1160,6 +1163,7 @@ fc_attach_transport(struct fc_function_template *ft)
 	count=0;
 	SETUP_HOST_ATTRIBUTE_RD(node_name);
 	SETUP_HOST_ATTRIBUTE_RD(port_name);
+	SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
 	SETUP_HOST_ATTRIBUTE_RD(supported_classes);
 	SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
 	SETUP_HOST_ATTRIBUTE_RD(symbolic_name);

include/scsi/scsi_transport_fc.h

@@ -303,6 +303,7 @@ struct fc_host_attrs {
 	/* Fixed Attributes */
 	u64 node_name;
 	u64 port_name;
+	u64 permanent_port_name;
 	u32 supported_classes;
 	u8  supported_fc4s[FC_FC4_LIST_SIZE];
 	char symbolic_name[FC_SYMBOLIC_NAME_SIZE];
@@ -338,6 +339,8 @@ struct fc_host_attrs {
 	(((struct fc_host_attrs *)(x)->shost_data)->node_name)
 #define fc_host_port_name(x)	\
 	(((struct fc_host_attrs *)(x)->shost_data)->port_name)
+#define fc_host_permanent_port_name(x)	\
+	(((struct fc_host_attrs *)(x)->shost_data)->permanent_port_name)
 #define fc_host_supported_classes(x)	\
 	(((struct fc_host_attrs *)(x)->shost_data)->supported_classes)
 #define fc_host_supported_fc4s(x)	\
@@ -426,6 +429,7 @@ struct fc_function_template {
 	/* host fixed attributes */
 	unsigned long	show_host_node_name:1;
 	unsigned long	show_host_port_name:1;
+	unsigned long	show_host_permanent_port_name:1;
 	unsigned long	show_host_supported_classes:1;
 	unsigned long	show_host_supported_fc4s:1;
 	unsigned long	show_host_symbolic_name:1;