[PATCH v2 12/12] fcoe: Rearrange fcoe port and NPIV port cleanup

[Robert Love <robert.w.love@intel.com>]

From: Neerav Parikh <neerav.parikh@intel.com>

When NPIV port destroy handler is called it does not do all the cleanup
required for the given NPIV port. This was happening as some of the
lport cleanup moved to fcoe_interface_cleanup() routine, which is not
called as part of the vport delete process.

This patch rearranges the sequence in which the fcoe_if_destory() and
fcoe_interface_cleanup() functions are being called from various places
in the code. It now matches the sequence they are constructed during the
create process for both N_Port as well as NPIV port.

Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Neerav Parikh <Neerav.Parikh@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
---
 drivers/scsi/fcoe/fcoe.c |   86 ++++++++++++++++++++++++++--------------------
 1 files changed, 49 insertions(+), 37 deletions(-)

diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index 522fbaa..204fa8d 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -431,21 +431,6 @@ void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
 	struct fcoe_ctlr *fip = &fcoe->ctlr;
 	u8 flogi_maddr[ETH_ALEN];
 	const struct net_device_ops *ops;
-	struct fcoe_port *port = lport_priv(fcoe->ctlr.lp);
-
-	FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
-
-	/* Logout of the fabric */
-	fc_fabric_logoff(fcoe->ctlr.lp);
-
-	/* Cleanup the fc_lport */
-	fc_lport_destroy(fcoe->ctlr.lp);
-
-	/* Stop the transmit retry timer */
-	del_timer_sync(&port->timer);
-
-	/* Free existing transmit skbs */
-	fcoe_clean_pending_queue(fcoe->ctlr.lp);
 
 	/*
 	 * Don't listen for Ethernet packets anymore.
@@ -468,9 +453,6 @@ void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
 	} else
 		dev_mc_del(netdev, FIP_ALL_ENODE_MACS);
 
-	if (!is_zero_ether_addr(port->data_src_addr))
-		dev_uc_del(netdev, port->data_src_addr);
-
 	/* Tell the LLD we are done w/ FCoE */
 	ops = netdev->netdev_ops;
 	if (ops->ndo_fcoe_disable) {
@@ -478,6 +460,8 @@ void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
 			FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
 					" specific feature for LLD.\n");
 	}
+
+	/* Release the self-reference taken during fcoe_interface_create() */
 	fcoe_interface_put(fcoe);
 }
 
@@ -861,6 +845,32 @@ skip_oem:
  */
 static void fcoe_if_destroy(struct fc_lport *lport)
 {
+	struct fcoe_port *port = lport_priv(lport);
+	struct fcoe_interface *fcoe = port->priv;
+	struct net_device *netdev = fcoe->netdev;
+
+	FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
+
+	/* Logout of the fabric */
+	fc_fabric_logoff(lport);
+
+	/* Cleanup the fc_lport */
+	fc_lport_destroy(lport);
+
+	/* Stop the transmit retry timer */
+	del_timer_sync(&port->timer);
+
+	/* Free existing transmit skbs */
+	fcoe_clean_pending_queue(lport);
+
+	rtnl_lock();
+	if (!is_zero_ether_addr(port->data_src_addr))
+		dev_uc_del(netdev, port->data_src_addr);
+	rtnl_unlock();
+
+	/* Release reference held in fcoe_if_create() */
+	fcoe_interface_put(fcoe);
+
 	/* Free queued packets for the per-CPU receive threads */
 	fcoe_percpu_clean(lport);
 
@@ -1813,7 +1823,6 @@ static int fcoe_device_notification(struct notifier_block *notifier,
 	case NETDEV_UNREGISTER:
 		list_del(&fcoe->list);
 		port = lport_priv(fcoe->ctlr.lp);
-		fcoe_interface_cleanup(fcoe);
 		queue_work(fcoe_wq, &port->destroy_work);
 		goto out;
 		break;
@@ -1907,22 +1916,22 @@ static int fcoe_destroy(struct net_device *netdev)
 {
 	struct fcoe_interface *fcoe;
 	struct fc_lport *lport;
+	struct fcoe_port *port;
 	int rc = 0;
 
 	mutex_lock(&fcoe_config_mutex);
 	rtnl_lock();
 	fcoe = fcoe_hostlist_lookup_port(netdev);
 	if (!fcoe) {
-		rtnl_unlock();
 		rc = -ENODEV;
 		goto out_nodev;
 	}
 	lport = fcoe->ctlr.lp;
+	port = lport_priv(lport);
 	list_del(&fcoe->list);
-	fcoe_interface_cleanup(fcoe);
-	rtnl_unlock();
-	fcoe_if_destroy(lport);
+	queue_work(fcoe_wq, &port->destroy_work);
 out_nodev:
+	rtnl_unlock();
 	mutex_unlock(&fcoe_config_mutex);
 	return rc;
 }
@@ -1934,10 +1943,25 @@ out_nodev:
 static void fcoe_destroy_work(struct work_struct *work)
 {
 	struct fcoe_port *port;
+	struct fcoe_interface *fcoe;
+	int npiv = 0;
 
 	port = container_of(work, struct fcoe_port, destroy_work);
 	mutex_lock(&fcoe_config_mutex);
+
+	/* set if this is an NPIV port */
+	npiv = port->lport->vport ? 1 : 0;
+
+	fcoe = port->priv;
 	fcoe_if_destroy(port->lport);
+
+	/* Do not tear down the fcoe interface for NPIV port */
+	if (!npiv) {
+		rtnl_lock();
+		fcoe_interface_cleanup(fcoe);
+		rtnl_unlock();
+	}
+
 	mutex_unlock(&fcoe_config_mutex);
 }
 
@@ -1966,7 +1990,7 @@ static bool fcoe_match(struct net_device *netdev)
  */
 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode)
 {
-	int rc;
+	int rc = 0;
 	struct fcoe_interface *fcoe;
 	struct fc_lport *lport;
 
@@ -1991,7 +2015,7 @@ static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode)
 		       netdev->name);
 		rc = -EIO;
 		fcoe_interface_cleanup(fcoe);
-		goto out_free;
+		goto out_nodev;
 	}
 
 	/* Make this the "master" N_Port */
@@ -2006,17 +2030,6 @@ static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode)
 	if (!fcoe_link_ok(lport))
 		fcoe_ctlr_link_up(&fcoe->ctlr);
 
-	/*
-	 * Release from init in fcoe_interface_create(), on success lport
-	 * should be holding a reference taken in fcoe_if_create().
-	 */
-	fcoe_interface_put(fcoe);
-	rtnl_unlock();
-	mutex_unlock(&fcoe_config_mutex);
-
-	return 0;
-out_free:
-	fcoe_interface_put(fcoe);
 out_nodev:
 	rtnl_unlock();
 	mutex_unlock(&fcoe_config_mutex);
@@ -2298,7 +2311,6 @@ static void __exit fcoe_exit(void)
 	list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
 		list_del(&fcoe->list);
 		port = lport_priv(fcoe->ctlr.lp);
-		fcoe_interface_cleanup(fcoe);
 		queue_work(fcoe_wq, &port->destroy_work);
 	}
 	rtnl_unlock();