cxgb3: Notify fatal errors

Set up a notification mechanism to inform upper layer modules
(iWARP, iSCSI) of a chip reset due to an EEH event or a fatal error.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 28 insertions, 4 deletions

diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 7381f378b4e6..f2c7cc3e263a 100644
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -2542,6 +2542,12 @@ static int t3_adapter_error(struct adapter *adapter, int reset)
 {
         int i, ret = 0;
 
+        if (is_offload(adapter) &&
+            test_bit(OFFLOAD_DEVMAP_BIT, &adapter->open_device_map)) {
+                cxgb3_err_notify(&adapter->tdev, OFFLOAD_STATUS_DOWN, 0);
+                offload_close(&adapter->tdev);
+        }
+
         /* Stop all ports */
         for_each_port(adapter, i) {
                 struct net_device *netdev = adapter->port[i];
@@ -2550,10 +2556,6 @@ static int t3_adapter_error(struct adapter *adapter, int reset)
                         cxgb_close(netdev);
         }
 
-        if (is_offload(adapter) &&
-            test_bit(OFFLOAD_DEVMAP_BIT, &adapter->open_device_map))
-                offload_close(&adapter->tdev);
-
         /* Stop SGE timers */
         t3_stop_sge_timers(adapter);
 
@@ -2605,6 +2607,9 @@ static void t3_resume_ports(struct adapter *adapter)
                         }
                 }
         }
+
+        if (is_offload(adapter) && !ofld_disable)
+                cxgb3_err_notify(&adapter->tdev, OFFLOAD_STATUS_UP, 0);
 }
 
 /*
diff --git a/drivers/net/cxgb3/cxgb3_offload.c b/drivers/net/cxgb3/cxgb3_offload.c
index 2d7f69aff1d9..620d80be6aac 100644
--- a/drivers/net/cxgb3/cxgb3_offload.c
+++ b/drivers/net/cxgb3/cxgb3_offload.c
@@ -153,6 +153,18 @@ void cxgb3_remove_clients(struct t3cdev *tdev)
         mutex_unlock(&cxgb3_db_lock);
 }
 
+void cxgb3_err_notify(struct t3cdev *tdev, u32 status, u32 error)
+{
+        struct cxgb3_client *client;
+
+        mutex_lock(&cxgb3_db_lock);
+        list_for_each_entry(client, &client_list, client_list) {
+                if (client->err_handler)
+                        client->err_handler(tdev, status, error);
+        }
+        mutex_unlock(&cxgb3_db_lock);
+}
+
 static struct net_device *get_iff_from_mac(struct adapter *adapter,
                                            const unsigned char *mac,
                                            unsigned int vlan)
diff --git a/drivers/net/cxgb3/cxgb3_offload.h b/drivers/net/cxgb3/cxgb3_offload.h
index d514e5019dfc..a8e8e5fcdf84 100644
--- a/drivers/net/cxgb3/cxgb3_offload.h
+++ b/drivers/net/cxgb3/cxgb3_offload.h
@@ -64,10 +64,16 @@ void cxgb3_register_client(struct cxgb3_client *client);
 void cxgb3_unregister_client(struct cxgb3_client *client);
 void cxgb3_add_clients(struct t3cdev *tdev);
 void cxgb3_remove_clients(struct t3cdev *tdev);
+void cxgb3_err_notify(struct t3cdev *tdev, u32 status, u32 error);
 
 typedef int (*cxgb3_cpl_handler_func)(struct t3cdev *dev,
                                       struct sk_buff *skb, void *ctx);
 
+enum {
+        OFFLOAD_STATUS_UP,
+        OFFLOAD_STATUS_DOWN
+};
+
 struct cxgb3_client {
         char *name;
         void (*add) (struct t3cdev *);
@@ -76,6 +82,7 @@ struct cxgb3_client {
         int (*redirect)(void *ctx, struct dst_entry *old,
                         struct dst_entry *new, struct l2t_entry *l2t);
         struct list_head client_list;
+        void (*err_handler)(struct t3cdev *tdev, u32 status, u32 error);
 };
 
 /*