From: Vasu Dev <vasu.dev@xxxxxxxxx>
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: Vasu Dev <vasu.dev@xxxxxxxxx>
Signed-off-by: Robert Love <robert.w.love@xxxxxxxxx>
---
drivers/scsi/fcoe/fcoe.c | 131 +++++++++++++++++++++-------------------------
1 files changed, 60 insertions(+), 71 deletions(-)
diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index 34408d9..5d3700d 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -381,6 +381,42 @@ out:
}
/**
+ * 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 @@ skip_oem:
* 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);
}
--
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