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Commit f04ca1b6 authored by Vasu Dev's avatar Vasu Dev Committed by James Bottomley
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[SCSI] fcoe: have fcoe log off and lport destroy before ndo_fcoe_disable 



Currently fcoe interface cleanup is done after ndo_fcoe_disable
and that prevents logoff going out to the peer, so this patch
moves all netdev cleanup and its releasing inside
fcoe_interface_cleanup to have log off before ndo_fcoe_disable
disables the fcoe.

This patch also fixes asymmetric rtnl locking around fcoe_if_destroy,
as currently this function requires rtnl held by its caller
and then have this func drops the lock, instead now don't have
any processing under rtnl inside fcoe_if_destroy, this required
moving few func to get build working again.

Signed-off-by: default avatarVasu Dev <vasu.dev@intel.com>
Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent f2817ec2

drivers/scsi/fcoe/fcoe.c

+60 −71
Original line number Diff line number Diff line
@@ -380,6 +380,42 @@ static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev, 
	return fcoe;

}



/**

 * fcoe_interface_release() - fcoe_port kref release function

 * @kref: Embedded reference count in an fcoe_interface struct

 */

static void fcoe_interface_release(struct kref *kref)

{

	struct fcoe_interface *fcoe;

	struct net_device *netdev;



	fcoe = container_of(kref, struct fcoe_interface, kref);

	netdev = fcoe->netdev;

	/* tear-down the FCoE controller */

	fcoe_ctlr_destroy(&fcoe->ctlr);

	kfree(fcoe);

	dev_put(netdev);

	module_put(THIS_MODULE);

}



/**

 * fcoe_interface_get() - Get a reference to a FCoE interface

 * @fcoe: The FCoE interface to be held

 */

static inline void fcoe_interface_get(struct fcoe_interface *fcoe)

{

	kref_get(&fcoe->kref);

}



/**

 * fcoe_interface_put() - Put a reference to a FCoE interface

 * @fcoe: The FCoE interface to be released

 */

static inline void fcoe_interface_put(struct fcoe_interface *fcoe)

{

	kref_put(&fcoe->kref, fcoe_interface_release);

}



/**

 * fcoe_interface_cleanup() - Clean up a FCoE interface

 * @fcoe: The FCoE interface to be cleaned up
@@ -392,6 +428,21 @@ 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.
@@ -414,6 +465,9 @@ 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) {
@@ -421,42 +475,7 @@ void fcoe_interface_cleanup(struct fcoe_interface *fcoe) 
			FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"

					" specific feature for LLD.\n");

	}

}



/**

 * fcoe_interface_release() - fcoe_port kref release function

 * @kref: Embedded reference count in an fcoe_interface struct

 */

static void fcoe_interface_release(struct kref *kref)

{

	struct fcoe_interface *fcoe;

	struct net_device *netdev;



	fcoe = container_of(kref, struct fcoe_interface, kref);

	netdev = fcoe->netdev;

	/* tear-down the FCoE controller */

	fcoe_ctlr_destroy(&fcoe->ctlr);

	kfree(fcoe);

	dev_put(netdev);

	module_put(THIS_MODULE);

}



/**

 * fcoe_interface_get() - Get a reference to a FCoE interface

 * @fcoe: The FCoE interface to be held

 */

static inline void fcoe_interface_get(struct fcoe_interface *fcoe)

{

	kref_get(&fcoe->kref);

}



/**

 * fcoe_interface_put() - Put a reference to a FCoE interface

 * @fcoe: The FCoE interface to be released

 */

static inline void fcoe_interface_put(struct fcoe_interface *fcoe)

{

	kref_put(&fcoe->kref, fcoe_interface_release);

	fcoe_interface_put(fcoe);

}



/**
@@ -821,39 +840,9 @@ static inline int fcoe_em_config(struct fc_lport *lport) 
 * fcoe_if_destroy() - Tear down a SW FCoE instance

 * @lport: The local port to be destroyed

 *

 * Locking: must be called with the RTNL mutex held and RTNL mutex

 * needed to be dropped by this function since not dropping RTNL

 * would cause circular locking warning on synchronous fip worker

 * cancelling thru fcoe_interface_put invoked by this function.

 *

 */

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);



	if (!is_zero_ether_addr(port->data_src_addr))

		dev_uc_del(netdev, port->data_src_addr);

	rtnl_unlock();



	/* receives may not be stopped until after this */

	fcoe_interface_put(fcoe);



	/* Free queued packets for the per-CPU receive threads */

	fcoe_percpu_clean(lport);
@@ -1836,6 +1825,7 @@ static int fcoe_enable(struct net_device *netdev) 
static int fcoe_destroy(struct net_device *netdev)

{

	struct fcoe_interface *fcoe;

	struct fc_lport *lport;

	int rc = 0;



	mutex_lock(&fcoe_config_mutex);
@@ -1846,10 +1836,11 @@ static int fcoe_destroy(struct net_device *netdev) 
		rc = -ENODEV;

		goto out_nodev;

	}

	fcoe_interface_cleanup(fcoe);

	lport = fcoe->ctlr.lp;

	list_del(&fcoe->list);

	/* RTNL mutex is dropped by fcoe_if_destroy */

	fcoe_if_destroy(fcoe->ctlr.lp);

	fcoe_interface_cleanup(fcoe);

	rtnl_unlock();

	fcoe_if_destroy(lport);

out_nodev:

	mutex_unlock(&fcoe_config_mutex);

	return rc;
@@ -1865,8 +1856,6 @@ static void fcoe_destroy_work(struct work_struct *work) 


	port = container_of(work, struct fcoe_port, destroy_work);

	mutex_lock(&fcoe_config_mutex);

	rtnl_lock();

	/* RTNL mutex is dropped by fcoe_if_destroy */

	fcoe_if_destroy(port->lport);

	mutex_unlock(&fcoe_config_mutex);

}