[SCSI] fcoe: fix offload feature flag change from netdev

Currently, when FCoE netdev feature flags are toggled by the LLD, lport's
corresponding flags are not updated. This causes the fc_fcp to still try to
offload the I/O. This patch adds support of NETDEV_FEAT_CHANGE event in fcoe
netdev device notification callback so we can update the lport offload flags
appropriately.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 49 insertions, 19 deletions

diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index ab6ea60f2aee..cf9d718c731c 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -589,6 +589,50 @@ static int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
 }
 
 /**
+ * fcoe_netdev_features_change - Updates the lport's offload flags based
+ * on the LLD netdev's FCoE feature flags
+ */
+static void fcoe_netdev_features_change(struct fc_lport *lport,
+                                        struct net_device *netdev)
+{
+        mutex_lock(&lport->lp_mutex);
+
+        if (netdev->features & NETIF_F_SG)
+                lport->sg_supp = 1;
+        else
+                lport->sg_supp = 0;
+
+        if (netdev->features & NETIF_F_FCOE_CRC) {
+                lport->crc_offload = 1;
+                FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
+        } else {
+                lport->crc_offload = 0;
+        }
+
+        if (netdev->features & NETIF_F_FSO) {
+                lport->seq_offload = 1;
+                lport->lso_max = netdev->gso_max_size;
+                FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
+                                lport->lso_max);
+        } else {
+                lport->seq_offload = 0;
+                lport->lso_max = 0;
+        }
+
+        if (netdev->fcoe_ddp_xid) {
+                lport->lro_enabled = 1;
+                lport->lro_xid = netdev->fcoe_ddp_xid;
+                FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
+                                lport->lro_xid);
+        } else {
+                lport->lro_enabled = 0;
+                lport->lro_xid = 0;
+        }
+
+        mutex_unlock(&lport->lp_mutex);
+}
+
+/**
  * fcoe_netdev_config() - Set up net devive for SW FCoE
  * @lport:  The local port that is associated with the net device
  * @netdev: The associated net device
@@ -624,25 +668,8 @@ static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
                 return -EINVAL;
 
         /* offload features support */
-        if (netdev->features & NETIF_F_SG)
-                lport->sg_supp = 1;
+        fcoe_netdev_features_change(lport, netdev);
 
-        if (netdev->features & NETIF_F_FCOE_CRC) {
-                lport->crc_offload = 1;
-                FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
-        }
-        if (netdev->features & NETIF_F_FSO) {
-                lport->seq_offload = 1;
-                lport->lso_max = netdev->gso_max_size;
-                FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
-                                lport->lso_max);
-        }
-        if (netdev->fcoe_ddp_xid) {
-                lport->lro_enabled = 1;
-                lport->lro_xid = netdev->fcoe_ddp_xid;
-                FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
-                                lport->lro_xid);
-        }
         skb_queue_head_init(&port->fcoe_pending_queue);
         port->fcoe_pending_queue_active = 0;
         setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport);
@@ -1861,6 +1888,9 @@ static int fcoe_device_notification(struct notifier_block *notifier,
                 schedule_work(&port->destroy_work);
                 goto out;
                 break;
+        case NETDEV_FEAT_CHANGE:
+                fcoe_netdev_features_change(lport, netdev);
+                break;
         default:
                 FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
                                 "from netdev netlink\n", event);
@@ -2056,8 +2086,8 @@ static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
                 rc = -ENODEV;
                 goto out_putdev;
         }
-        list_del(&fcoe->list);
         fcoe_interface_cleanup(fcoe);
+        list_del(&fcoe->list);
         /* RTNL mutex is dropped by fcoe_if_destroy */
         fcoe_if_destroy(fcoe->ctlr.lp);