eHEA: Introducing support vor DLPAR memory add

This patch adds support for DLPAR memory add to the eHEA driver. To detect
whether memory was added the driver uses its own memory mapping table and
checks for kernel addresses whether they're located in already known memory
sections. If not the function ehea_rereg_mrs() is triggered which performs
a rebuild of the mapping table and a re-registration of the global memory
region.

Signed-off-by: Thomas Klein <tklein@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 130 insertions, 14 deletions

diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index 383144db4d1..1d1571cf322 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -79,6 +79,11 @@ MODULE_PARM_DESC(sq_entries, " Number of entries for the Send Queue  "
 MODULE_PARM_DESC(use_mcs, " 0:NAPI, 1:Multiple receive queues, Default = 1 ");
 
 static int port_name_cnt = 0;
+static LIST_HEAD(adapter_list);
+u64 ehea_driver_flags = 0;
+struct workqueue_struct *ehea_driver_wq;
+struct work_struct ehea_rereg_mr_task;
+
 
 static int __devinit ehea_probe_adapter(struct ibmebus_dev *dev,
 					const struct of_device_id *id);
@@ -238,13 +243,17 @@ static int ehea_refill_rq_def(struct ehea_port_res *pr,
 		rwqe->wr_id = EHEA_BMASK_SET(EHEA_WR_ID_TYPE, wqe_type)
 			    | EHEA_BMASK_SET(EHEA_WR_ID_INDEX, index);
 		rwqe->sg_list[0].l_key = pr->recv_mr.lkey;
-		rwqe->sg_list[0].vaddr = (u64)skb->data;
+		rwqe->sg_list[0].vaddr = ehea_map_vaddr(skb->data);
 		rwqe->sg_list[0].len = packet_size;
 		rwqe->data_segments = 1;
 
 		index++;
 		index &= max_index_mask;
+
+		if (unlikely(test_bit(__EHEA_STOP_XFER, &ehea_driver_flags)))
+			goto out;
 	}
+
 	q_skba->index = index;
 
 	/* Ring doorbell */
@@ -253,7 +262,7 @@ static int ehea_refill_rq_def(struct ehea_port_res *pr,
 		ehea_update_rq2a(pr->qp, i);
 	else
 		ehea_update_rq3a(pr->qp, i);
-
+out:
 	return ret;
 }
 
@@ -1321,7 +1330,7 @@ static void write_swqe2_TSO(struct sk_buff *skb,
 			sg1entry->len = skb_data_size - headersize;
 
 			tmp_addr = (u64)(skb->data + headersize);
-			sg1entry->vaddr = tmp_addr;
+			sg1entry->vaddr = ehea_map_vaddr(tmp_addr);
 			swqe->descriptors++;
 		}
 	} else
@@ -1352,7 +1361,7 @@ static void write_swqe2_nonTSO(struct sk_buff *skb,
 			sg1entry->l_key = lkey;
 			sg1entry->len = skb_data_size - SWQE2_MAX_IMM;
 			tmp_addr = (u64)(skb->data + SWQE2_MAX_IMM);
-			sg1entry->vaddr = tmp_addr;
+			sg1entry->vaddr = ehea_map_vaddr(tmp_addr);
 			swqe->descriptors++;
 		}
 	} else {
@@ -1391,7 +1400,7 @@ static inline void write_swqe2_data(struct sk_buff *skb, struct net_device *dev,
 			sg1entry->len = frag->size;
 			tmp_addr =  (u64)(page_address(frag->page)
 					  + frag->page_offset);
-			sg1entry->vaddr = tmp_addr;
+			sg1entry->vaddr = ehea_map_vaddr(tmp_addr);
 			swqe->descriptors++;
 			sg1entry_contains_frag_data = 1;
 		}
@@ -1406,7 +1415,7 @@ static inline void write_swqe2_data(struct sk_buff *skb, struct net_device *dev,
 
 			tmp_addr = (u64)(page_address(frag->page)
 					 + frag->page_offset);
-			sgentry->vaddr = tmp_addr;
+			sgentry->vaddr = ehea_map_vaddr(tmp_addr);
 			swqe->descriptors++;
 		}
 	}
@@ -1878,6 +1887,9 @@ static int ehea_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		ehea_dump(swqe, 512, "swqe");
 	}
 
+	if (unlikely(test_bit(__EHEA_STOP_XFER, &ehea_driver_flags)))
+		goto out;
+
 	ehea_post_swqe(pr->qp, swqe);
 	pr->tx_packets++;
 
@@ -1892,7 +1904,7 @@ static int ehea_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 	dev->trans_start = jiffies;
 	spin_unlock(&pr->xmit_lock);
-
+out:
 	return NETDEV_TX_OK;
 }
 
@@ -2220,6 +2232,9 @@ out_dereg_bc:
 out_clean_pr:
 	ehea_clean_all_portres(port);
 out:
+	if (ret)
+		ehea_info("Failed starting %s. ret=%i", dev->name, ret);
+
 	return ret;
 }
 
@@ -2259,8 +2274,13 @@ static int ehea_down(struct net_device *dev)
 			msleep(1);
 
 	ehea_broadcast_reg_helper(port, H_DEREG_BCMC);
-	ret = ehea_clean_all_portres(port);
 	port->state = EHEA_PORT_DOWN;
+
+	ret = ehea_clean_all_portres(port);
+	if (ret)
+		ehea_info("Failed freeing resources for %s. ret=%i",
+			  dev->name, ret);
+
 	return ret;
 }
 
@@ -2292,15 +2312,11 @@ static void ehea_reset_port(struct work_struct *work)
 	netif_stop_queue(dev);
 	netif_poll_disable(dev);
 
-	ret = ehea_down(dev);
-	if (ret)
-		ehea_error("ehea_down failed. not all resources are freed");
+	ehea_down(dev);
 
 	ret = ehea_up(dev);
-	if (ret) {
-		ehea_error("Reset device %s failed: ret=%d", dev->name, ret);
+	if (ret)
 		goto out;
-	}
 
 	if (netif_msg_timer(port))
 		ehea_info("Device %s resetted successfully", dev->name);
@@ -2312,6 +2328,88 @@ out:
 	return;
 }
 
+static void ehea_rereg_mrs(struct work_struct *work)
+{
+	int ret, i;
+	struct ehea_adapter *adapter;
+
+	ehea_info("LPAR memory enlarged - re-initializing driver");
+
+	list_for_each_entry(adapter, &adapter_list, list)
+		if (adapter->active_ports) {
+			/* Shutdown all ports */
+			for (i = 0; i < EHEA_MAX_PORTS; i++) {
+				struct ehea_port *port = adapter->port[i];
+
+				if (port) {
+					struct net_device *dev = port->netdev;
+
+					if (dev->flags & IFF_UP) {
+						ehea_info("stopping %s",
+							  dev->name);
+						down(&port->port_lock);
+						netif_stop_queue(dev);
+						netif_poll_disable(dev);
+						ehea_down(dev);
+						up(&port->port_lock);
+					}
+				}
+			}
+
+			/* Unregister old memory region */
+			ret = ehea_rem_mr(&adapter->mr);
+			if (ret) {
+				ehea_error("unregister MR failed - driver"
+					   " inoperable!");
+				goto out;
+			}
+		}
+
+	ehea_destroy_busmap();
+
+	ret = ehea_create_busmap();
+	if (ret)
+		goto out;
+
+	clear_bit(__EHEA_STOP_XFER, &ehea_driver_flags);
+
+	list_for_each_entry(adapter, &adapter_list, list)
+		if (adapter->active_ports) {
+			/* Register new memory region */
+			ret = ehea_reg_kernel_mr(adapter, &adapter->mr);
+			if (ret) {
+				ehea_error("register MR failed - driver"
+					   " inoperable!");
+				goto out;
+			}
+
+			/* Restart all ports */
+			for (i = 0; i < EHEA_MAX_PORTS; i++) {
+				struct ehea_port *port = adapter->port[i];
+
+				if (port) {
+					struct net_device *dev = port->netdev;
+
+					if (dev->flags & IFF_UP) {
+						ehea_info("restarting %s",
+							  dev->name);
+						down(&port->port_lock);
+
+						ret = ehea_up(dev);
+						if (!ret) {
+							netif_poll_enable(dev);
+							netif_wake_queue(dev);
+						}
+
+						up(&port->port_lock);
+					}
+				}
+			}
+		}
+out:
+	return;
+}
+
 static void ehea_tx_watchdog(struct net_device *dev)
 {
 	struct ehea_port *port = netdev_priv(dev);
@@ -2573,6 +2671,8 @@ struct ehea_port *ehea_setup_single_port(struct ehea_adapter *adapter,
 	ehea_info("%s: Jumbo frames are %sabled", dev->name,
 		  jumbo == 1 ? "en" : "dis");
 
+	adapter->active_ports++;
+
 	return port;
 
 out_unreg_port:
@@ -2596,6 +2696,7 @@ static void ehea_shutdown_single_port(struct ehea_port *port)
 	ehea_unregister_port(port);
 	kfree(port->mc_list);
 	free_netdev(port->netdev);
+	port->adapter->active_ports--;
 }
 
 static int ehea_setup_ports(struct ehea_adapter *adapter)
@@ -2788,6 +2889,8 @@ static int __devinit ehea_probe_adapter(struct ibmebus_dev *dev,
 		goto out;
 	}
 
+	list_add(&adapter->list, &adapter_list);
+
 	adapter->ebus_dev = dev;
 
 	adapter_handle = of_get_property(dev->ofdev.node, "ibm,hea-handle",
@@ -2891,7 +2994,10 @@ static int __devexit ehea_remove(struct ibmebus_dev *dev)
 
 	ehea_destroy_eq(adapter->neq);
 	ehea_remove_adapter_mr(adapter);
+	list_del(&adapter->list);
+
 	kfree(adapter);
+
 	return 0;
 }
 
@@ -2939,9 +3045,18 @@ int __init ehea_module_init(void)
 	printk(KERN_INFO "IBM eHEA ethernet device driver (Release %s)\n",
 	       DRV_VERSION);
 
+	ehea_driver_wq = create_workqueue("ehea_driver_wq");
+
+	INIT_WORK(&ehea_rereg_mr_task, ehea_rereg_mrs);
+
 	ret = check_module_parm();
 	if (ret)
 		goto out;
+
+	ret = ehea_create_busmap();
+	if (ret)
+		goto out;
+
 	ret = ibmebus_register_driver(&ehea_driver);
 	if (ret) {
 		ehea_error("failed registering eHEA device driver on ebus");
@@ -2965,6 +3080,7 @@ static void __exit ehea_module_exit(void)
 {
 	driver_remove_file(&ehea_driver.driver, &driver_attr_capabilities);
 	ibmebus_unregister_driver(&ehea_driver);
+	ehea_destroy_busmap();
 }
 
 module_init(ehea_module_init);