[SCSI] fcoe: move offload exchange manager pointer from fcoe_port to fcoe_interface

The offload EM pointer is only used when setting up a new libfc instance, but
as it's designed to be shared among NPIV VN_Ports it should be tracked in
fcoe_interface.

With the host-list changed to track fcoe_interfaces as well, this is needed
before we can remove the priv pointer from that structure (which is only there
to help in the transition, and stops making sense once NPIV is enabled).

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/scsi/fcoe/fcoe.c

@@ -438,7 +438,6 @@ bool fcoe_oem_match(struct fc_frame *fp)
 static inline int fcoe_em_config(struct fc_lport *lp)
 {
 	struct fcoe_port *port = lport_priv(lp);
-	struct fcoe_port *oldport = NULL;
 	struct fcoe_interface *fcoe = port->fcoe;
 	struct fcoe_interface *oldfcoe = NULL;
 	struct net_device *old_real_dev, *cur_real_dev;
@@ -464,30 +463,29 @@ static inline int fcoe_em_config(struct fc_lport *lp)
 		cur_real_dev = fcoe->netdev;
 
 	list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
-		oldport = oldfcoe->priv;
 		if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
 			old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
 		else
 			old_real_dev = oldfcoe->netdev;
 
 		if (cur_real_dev == old_real_dev) {
-			port->oem = oldport->oem;
+			fcoe->oem = oldfcoe->oem;
 			break;
 		}
 	}
 
-	if (port->oem) {
-		if (!fc_exch_mgr_add(lp, port->oem, fcoe_oem_match)) {
+	if (fcoe->oem) {
+		if (!fc_exch_mgr_add(lp, fcoe->oem, fcoe_oem_match)) {
 			printk(KERN_ERR "fcoe_em_config: failed to add "
 			       "offload em:%p on interface:%s\n",
-			       port->oem, fcoe->netdev->name);
+			       fcoe->oem, fcoe->netdev->name);
 			return -ENOMEM;
 		}
 	} else {
-		port->oem = fc_exch_mgr_alloc(lp, FC_CLASS_3,
+		fcoe->oem = fc_exch_mgr_alloc(lp, FC_CLASS_3,
 					    FCOE_MIN_XID, lp->lro_xid,
 					    fcoe_oem_match);
-		if (!port->oem) {
+		if (!fcoe->oem) {
 			printk(KERN_ERR "fcoe_em_config: failed to allocate "
 			       "em for offload exches on interface:%s\n",
 			       fcoe->netdev->name);

drivers/scsi/fcoe/fcoe.h

@@ -86,6 +86,7 @@ struct fcoe_interface {
 	struct packet_type  fcoe_packet_type;
 	struct packet_type  fip_packet_type;
 	struct fcoe_ctlr ctlr;
+	struct fc_exch_mgr *oem;		/* offload exchange manager */
 };
 
 /*
@@ -94,7 +95,6 @@ struct fcoe_interface {
  */
 struct fcoe_port {
 	struct fcoe_interface *fcoe;
-	struct fc_exch_mgr *oem;		/* offload exchange manger */
 	struct sk_buff_head fcoe_pending_queue;
 	u8	fcoe_pending_queue_active;
 	struct timer_list timer;		/* queue timer */