[SCSI] transport_srp: add rport roles attribute

This adds a 'roles' attribute to rport like transport_fc. The role can
be initiator or target. That is, the initiator driver creates target
remote ports and the target driver creates initiator remote ports.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 28 insertions, 1 deletions

diff --git a/drivers/scsi/scsi_transport_srp.c b/drivers/scsi/scsi_transport_srp.c
index dcb3d2aa780c..608abd8aef20 100644
--- a/drivers/scsi/scsi_transport_srp.c
+++ b/drivers/scsi/scsi_transport_srp.c
@@ -37,7 +37,7 @@ struct srp_host_attrs {
 #define to_srp_host_attrs(host) ((struct srp_host_attrs *)(host)->shost_data)
 
 #define SRP_HOST_ATTRS 0
-#define SRP_RPORT_ATTRS 3
+#define SRP_RPORT_ATTRS 2
 
 struct srp_internal {
         struct scsi_transport_template t;
@@ -107,6 +107,31 @@ show_srp_rport_id(struct class_device *cdev, char *buf)
 
 static CLASS_DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL);
 
+static const struct {
+        u32 value;
+        char *name;
+} srp_rport_role_names[] = {
+        {SRP_RPORT_ROLE_INITIATOR, "SRP Initiator"},
+        {SRP_RPORT_ROLE_TARGET, "SRP Target"},
+};
+
+static ssize_t
+show_srp_rport_roles(struct class_device *cdev, char *buf)
+{
+        struct srp_rport *rport = transport_class_to_srp_rport(cdev);
+        int i;
+        char *name = NULL;
+
+        for (i = 0; i < ARRAY_SIZE(srp_rport_role_names); i++)
+                if (srp_rport_role_names[i].value == rport->roles) {
+                        name = srp_rport_role_names[i].name;
+                        break;
+                }
+        return sprintf(buf, "%s\n", name ? : "unknown");
+}
+
+static CLASS_DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL);
+
 static void srp_rport_release(struct device *dev)
 {
         struct srp_rport *rport = dev_to_rport(dev);
@@ -182,6 +207,7 @@ struct srp_rport *srp_rport_add(struct Scsi_Host *shost,
         rport->dev.release = srp_rport_release;
 
         memcpy(rport->port_id, ids->port_id, sizeof(rport->port_id));
+        rport->roles = ids->roles;
 
         id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id);
         sprintf(rport->dev.bus_id, "port-%d:%d", shost->host_no, id);
@@ -266,6 +292,7 @@ srp_attach_transport(struct srp_function_template *ft)
 
         count = 0;
         SETUP_RPORT_ATTRIBUTE_RD(port_id);
+        SETUP_RPORT_ATTRIBUTE_RD(roles);
         i->rport_attrs[count] = NULL;
 
         i->f = ft;