[PATCH] zfcp: add rports to enable scsi_add_device to work again

This patch fixes a severe problem with 2.6.13-rc7.

Due to recent SCSI changes it is not possible to add any LUNs to the zfcp
device driver anymore.  With registration of remote ports this is fixed.

Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com>
Acked-by: James Bottomley <jejb@steeleye.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Author: Andreas Herrmann

drivers/s390/scsi/zfcp_aux.c

@@ -1299,13 +1299,10 @@ struct zfcp_port *
 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
 		  u32 d_id)
 {
-	struct zfcp_port *port, *tmp_port;
+	struct zfcp_port *port;
 	int check_wwpn;
-	scsi_id_t scsi_id;
-	int found;
 
 	check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
-
 	/*
 	 * check that there is no port with this WWPN already in list
 	 */
@@ -1368,7 +1365,7 @@ zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
 	} else {
 		snprintf(port->sysfs_device.bus_id,
 			 BUS_ID_SIZE, "0x%016llx", wwpn);
-	port->sysfs_device.parent = &adapter->ccw_device->dev;
+		port->sysfs_device.parent = &adapter->ccw_device->dev;
 	}
 	port->sysfs_device.release = zfcp_sysfs_port_release;
 	dev_set_drvdata(&port->sysfs_device, port);
@@ -1388,24 +1385,8 @@ zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
 
 	zfcp_port_get(port);
 
-	scsi_id = 1;
-	found = 0;
 	write_lock_irq(&zfcp_data.config_lock);
-	list_for_each_entry(tmp_port, &adapter->port_list_head, list) {
-		if (atomic_test_mask(ZFCP_STATUS_PORT_NO_SCSI_ID,
-				     &tmp_port->status))
-			continue;
-		if (tmp_port->scsi_id != scsi_id) {
-			found = 1;
-			break;
-		}
-		scsi_id++;
-	}
-	port->scsi_id = scsi_id;
-	if (found)
-		list_add_tail(&port->list, &tmp_port->list);
-	else
-		list_add_tail(&port->list, &adapter->port_list_head);
+	list_add_tail(&port->list, &adapter->port_list_head);
 	atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 	atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
 	if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
@@ -1422,11 +1403,15 @@ zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
 void
 zfcp_port_dequeue(struct zfcp_port *port)
 {
+	struct fc_port *rport;
+
 	zfcp_port_wait(port);
 	write_lock_irq(&zfcp_data.config_lock);
 	list_del(&port->list);
 	port->adapter->ports--;
 	write_unlock_irq(&zfcp_data.config_lock);
+	if (port->rport)
+		fc_remote_port_delete(rport);
 	zfcp_adapter_put(port->adapter);
 	zfcp_sysfs_port_remove_files(&port->sysfs_device,
 				     atomic_read(&port->status));

drivers/s390/scsi/zfcp_ccw.c

@@ -202,9 +202,19 @@ static int
 zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 {
 	struct zfcp_adapter *adapter;
+	struct zfcp_port *port;
+	struct fc_port *rport;
 
 	down(&zfcp_data.config_sema);
 	adapter = dev_get_drvdata(&ccw_device->dev);
+	/* might be racy, but we cannot take config_lock due to the fact that
+	   fc_remote_port_delete might sleep */
+	list_for_each_entry(port, &adapter->port_list_head, list)
+		if (port->rport) {
+			rport = port->rport;
+			port->rport = NULL;
+			fc_remote_port_delete(rport);
+		}
 	zfcp_erp_adapter_shutdown(adapter, 0);
 	zfcp_erp_wait(adapter);
 	zfcp_adapter_scsi_unregister(adapter);

drivers/s390/scsi/zfcp_def.h

@@ -906,6 +906,7 @@ struct zfcp_adapter {
  */
 struct zfcp_port {
 	struct device          sysfs_device;   /* sysfs device */
+	struct fc_rport        *rport;         /* rport of fc transport class */
 	struct list_head       list;	       /* list of remote ports */
 	atomic_t               refcount;       /* reference count */
 	wait_queue_head_t      remove_wq;      /* can be used to wait for
@@ -916,7 +917,6 @@ struct zfcp_port {
 						  list */
 	u32		       units;	       /* # of logical units in list */
 	atomic_t	       status;	       /* status of this remote port */
-	scsi_id_t	       scsi_id;	       /* own SCSI ID */
 	wwn_t		       wwnn;	       /* WWNN if known */
 	wwn_t		       wwpn;	       /* WWPN */
 	fc_id_t		       d_id;	       /* D_ID */

drivers/s390/scsi/zfcp_erp.c

@@ -3360,13 +3360,32 @@ zfcp_erp_action_cleanup(int action, struct zfcp_adapter *adapter,
 		if ((result == ZFCP_ERP_SUCCEEDED)
 		    && (!atomic_test_mask(ZFCP_STATUS_UNIT_TEMPORARY,
 					  &unit->status))
-		    && (!unit->device))
- 			scsi_add_device(unit->port->adapter->scsi_host, 0,
- 					unit->port->scsi_id, unit->scsi_lun);
+		    && !unit->device
+		    && port->rport)
+ 			scsi_add_device(port->adapter->scsi_host, 0,
+ 					port->rport->scsi_target_id,
+					unit->scsi_lun);
 		zfcp_unit_put(unit);
 		break;
 	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 	case ZFCP_ERP_ACTION_REOPEN_PORT:
+		if ((result == ZFCP_ERP_SUCCEEDED)
+		    && !atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN,
+					 &port->status)
+		    && !port->rport) {
+			struct fc_rport_identifiers ids;
+			ids.node_name = port->wwnn;
+			ids.port_name = port->wwpn;
+			ids.port_id = port->d_id;
+			ids.roles = FC_RPORT_ROLE_FCP_TARGET;
+			port->rport =
+				fc_remote_port_add(adapter->scsi_host, 0, &ids);
+			if (!port->rport)
+				ZFCP_LOG_NORMAL("failed registration of rport"
+						"(adapter %s, wwpn=0x%016Lx)\n",
+						zfcp_get_busid_by_port(port),
+						port->wwpn);
+		}
 		zfcp_port_put(port);
 		break;
 	case ZFCP_ERP_ACTION_REOPEN_ADAPTER:

drivers/s390/scsi/zfcp_ext.h

@@ -143,6 +143,8 @@ extern int zfcp_scsi_command_async(struct zfcp_adapter *,struct zfcp_unit *,
 				   struct scsi_cmnd *, struct timer_list *);
 extern int zfcp_scsi_command_sync(struct zfcp_unit *, struct scsi_cmnd *,
 				  struct timer_list *);
+extern void zfcp_set_fc_host_attrs(struct zfcp_adapter *);
+extern void zfcp_set_fc_rport_attrs(struct zfcp_port *);
 extern struct scsi_transport_template *zfcp_transport_template;
 extern struct fc_function_template zfcp_transport_functions;
 

drivers/s390/scsi/zfcp_fsf.c

@@ -2062,6 +2062,7 @@ zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
 		zfcp_erp_adapter_shutdown(adapter, 0);
 		return -EIO;
 	}
+	zfcp_set_fc_host_attrs(adapter);
 	return 0;
 }
 

drivers/s390/scsi/zfcp_scsi.c

@@ -389,7 +389,7 @@ zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id,
 	struct zfcp_unit *unit, *retval = NULL;
 
 	list_for_each_entry(port, &adapter->port_list_head, list) {
-		if (id != port->scsi_id)
+		if (!port->rport || (id != port->rport->scsi_target_id))
 			continue;
 		list_for_each_entry(unit, &port->unit_list_head, list) {
 			if (lun == unit->scsi_lun) {
@@ -408,7 +408,7 @@ zfcp_port_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id)
 	struct zfcp_port *port;
 
 	list_for_each_entry(port, &adapter->port_list_head, list) {
-		if (id == port->scsi_id)
+		if (port->rport && (id == port->rport->scsi_target_id))
 			return port;
 	}
 	return (struct zfcp_port *) NULL;
@@ -634,7 +634,6 @@ zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 {
 	int retval;
 	struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
-	struct Scsi_Host *scsi_host = scpnt->device->host;
 
 	if (!unit) {
 		ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
@@ -729,7 +728,6 @@ zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
 {
 	int retval = 0;
 	struct zfcp_unit *unit;
-	struct Scsi_Host *scsi_host = scpnt->device->host;
 
 	unit = (struct zfcp_unit *) scpnt->device->hostdata;
 	ZFCP_LOG_NORMAL("bus reset because of problems with "
@@ -753,7 +751,6 @@ zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 {
 	int retval = 0;
 	struct zfcp_unit *unit;
-	struct Scsi_Host *scsi_host = scpnt->device->host;
 
 	unit = (struct zfcp_unit *) scpnt->device->hostdata;
 	ZFCP_LOG_NORMAL("host reset because of problems with "
@@ -833,6 +830,7 @@ zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 	shost = adapter->scsi_host;
 	if (!shost)
 		return;
+	fc_remove_host(shost);
 	scsi_remove_host(shost);
 	scsi_host_put(shost);
 	adapter->scsi_host = NULL;
@@ -906,13 +904,30 @@ zfcp_get_node_name(struct scsi_target *starget)
 	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 }
 
+void
+zfcp_set_fc_host_attrs(struct zfcp_adapter *adapter)
+{
+	struct Scsi_Host *shost = adapter->scsi_host;
+
+	fc_host_node_name(shost) = adapter->wwnn;
+	fc_host_port_name(shost) = adapter->wwpn;
+	strncpy(fc_host_serial_number(shost), adapter->serial_number,
+                min(FC_SERIAL_NUMBER_SIZE, 32));
+	fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
+}
+
 struct fc_function_template zfcp_transport_functions = {
 	.get_starget_port_id = zfcp_get_port_id,
 	.get_starget_port_name = zfcp_get_port_name,
 	.get_starget_node_name = zfcp_get_node_name,
 	.show_starget_port_id = 1,
 	.show_starget_port_name = 1,
 	.show_starget_node_name = 1,
+	.show_rport_supported_classes = 1,
+	.show_host_node_name = 1,
+	.show_host_port_name = 1,
+	.show_host_supported_classes = 1,
+	.show_host_serial_number = 1,
 };
 
 /**