[SCSI] iscsi_transport: export hw address

Add hw address sysfs file.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

3 files changed, 45 insertions, 3 deletions

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 4fbd8e1a0695..1ba98d255fac 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -32,7 +32,7 @@
 
 #define ISCSI_SESSION_ATTRS 11
 #define ISCSI_CONN_ATTRS 11
-#define ISCSI_HOST_ATTRS 0
+#define ISCSI_HOST_ATTRS 1
 #define ISCSI_TRANSPORT_VERSION "2.0-724"
 
 struct iscsi_internal {
@@ -1197,6 +1197,25 @@ static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
                         NULL)
 iscsi_priv_session_attr(recovery_tmo, "%d");
 
+/*
+ * iSCSI host attrs
+ */
+#define iscsi_host_attr_show(param)                                     \
+static ssize_t                                                          \
+show_host_param_##param(struct class_device *cdev, char *buf)           \
+{                                                                       \
+        struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
+        struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
+        return priv->iscsi_transport->get_host_param(shost, param, buf); \
+}
+
+#define iscsi_host_attr(field, param)                                   \
+        iscsi_host_attr_show(param)                                     \
+static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
+                        NULL);
+
+iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
+
 #define SETUP_PRIV_SESSION_RD_ATTR(field)                               \
 do {                                                                    \
         priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \
@@ -1220,6 +1239,14 @@ do {									\
         }                                                               \
 } while (0)
 
+#define SETUP_HOST_RD_ATTR(field, param_flag)                           \
+do {                                                                    \
+        if (tt->host_param_mask & param_flag) {                         \
+                priv->host_attrs[count] = &class_device_attr_host_##field; \
+                count++;                                                \
+        }                                                               \
+} while (0)
+
 static int iscsi_session_match(struct attribute_container *cont,
                            struct device *dev)
 {
@@ -1321,9 +1348,13 @@ iscsi_register_transport(struct iscsi_transport *tt)
         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
         priv->t.host_attrs.ac.match = iscsi_host_match;
         priv->t.host_size = sizeof(struct iscsi_host);
-        priv->host_attrs[0] = NULL;
         transport_container_register(&priv->t.host_attrs);
 
+        SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
+        BUG_ON(count > ISCSI_HOST_ATTRS);
+        priv->host_attrs[count] = NULL;
+        count = 0;
+
         /* connection parameters */
         priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
         priv->conn_cont.ac.class = &iscsi_connection_class.class;
diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index 55ebf035e620..fba211743729 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -250,6 +250,14 @@ enum iscsi_param {
 #define ISCSI_CONN_PORT                 (1 << ISCSI_PARAM_CONN_PORT)
 #define ISCSI_CONN_ADDRESS              (1 << ISCSI_PARAM_CONN_ADDRESS)
 
+/* iSCSI HBA params */
+enum iscsi_host_param {
+        ISCSI_HOST_PARAM_HWADDRESS,
+        ISCSI_HOST_PARAM_MAX,
+};
+
+#define ISCSI_HOST_HWADDRESS            (1 << ISCSI_HOST_PARAM_HWADDRESS)
+
 #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
 #define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index d5c218ddc527..e962c5357eef 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -79,7 +79,8 @@ struct iscsi_transport {
         char *name;
         unsigned int caps;
         /* LLD sets this to indicate what values it can export to sysfs */
-        unsigned int param_mask;
+        uint64_t param_mask;
+        uint64_t host_param_mask;
         struct scsi_host_template *host_template;
         /* LLD connection data size */
         int conndata_size;
@@ -105,6 +106,8 @@ struct iscsi_transport {
                                enum iscsi_param param, char *buf);
         int (*get_session_param) (struct iscsi_cls_session *session,
                                   enum iscsi_param param, char *buf);
+        int (*get_host_param) (struct Scsi_Host *shost,
+                                enum iscsi_host_param param, char *buf);
         int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
                          char *data, uint32_t data_size);
         void (*get_stats) (struct iscsi_cls_conn *conn,