scsi: qla2xxx: Fix Management Server NPort handle reservation logic

After selecting the NPort handle/loop_id, set a bit in the loop_id_map to
prevent others from selecting the same NPort handle.
Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_gbl.h

@@ -118,6 +118,7 @@ extern int qla2x00_post_async_prlo_done_work(struct scsi_qla_host *,
     fc_port_t *, uint16_t *);
 int qla_post_iidma_work(struct scsi_qla_host *vha, fc_port_t *fcport);
 void qla_do_iidma_work(struct scsi_qla_host *vha, fc_port_t *fcport);
+int qla2x00_reserve_mgmt_server_loop_id(scsi_qla_host_t *);
 /*
  * Global Data in qla_os.c source file.
  */

drivers/scsi/qla2xxx/qla_init.c

@@ -5616,6 +5616,34 @@ qla2x00_find_new_loop_id(scsi_qla_host_t *vha, fc_port_t *dev)
 }
 
 
+/* FW does not set aside Loop id for MGMT Server/FFFFFAh */
+int
+qla2x00_reserve_mgmt_server_loop_id(scsi_qla_host_t *vha)
+{
+	int loop_id = FC_NO_LOOP_ID;
+	int lid = NPH_MGMT_SERVER - vha->vp_idx;
+	unsigned long flags;
+	struct qla_hw_data *ha = vha->hw;
+
+	if (vha->vp_idx == 0) {
+		set_bit(NPH_MGMT_SERVER, ha->loop_id_map);
+		return NPH_MGMT_SERVER;
+	}
+
+	/* pick id from high and work down to low */
+	spin_lock_irqsave(&ha->vport_slock, flags);
+	for (; lid > 0; lid--) {
+		if (!test_bit(lid, vha->hw->loop_id_map)) {
+			set_bit(lid, vha->hw->loop_id_map);
+			loop_id = lid;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&ha->vport_slock, flags);
+
+	return loop_id;
+}
+
 /*
  * qla2x00_fabric_login
  *	Issue fabric login command.

drivers/scsi/qla2xxx/qla_mid.c

@@ -485,7 +485,7 @@ qla24xx_create_vhost(struct fc_vport *fc_vport)
 		    "Couldn't allocate vp_id.\n");
 		goto create_vhost_failed;
 	}
-	vha->mgmt_svr_loop_id = NPH_MGMT_SERVER;
+	vha->mgmt_svr_loop_id = qla2x00_reserve_mgmt_server_loop_id(vha);
 
 	vha->dpc_flags = 0L;
 

drivers/scsi/qla2xxx/qla_os.c

@@ -3048,7 +3048,8 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 	host = base_vha->host;
 	base_vha->req = req;
 	if (IS_QLA2XXX_MIDTYPE(ha))
-		base_vha->mgmt_svr_loop_id = NPH_MGMT_SERVER;
+		base_vha->mgmt_svr_loop_id =
+			qla2x00_reserve_mgmt_server_loop_id(base_vha);
 	else
 		base_vha->mgmt_svr_loop_id = MANAGEMENT_SERVER +
 						base_vha->vp_idx;