Merge pull request #4 from RT-Thread/master

sync

1 files changed, 34 insertions, 5 deletions

diff --git a/components/net/netdev/src/netdev.c b/components/net/netdev/src/netdev.c
index bfefc2d1de..71b1ec7ccd 100644
--- a/components/net/netdev/src/netdev.c
+++ b/components/net/netdev/src/netdev.c
@@ -134,12 +134,14 @@ int netdev_unregister(struct netdev *netdev)
 
 /**
  * This function will get the first network interface device
- * with the link_up status in network interface device list.
+ * with the flags in network interface device list.
+ * 
+ * @param flags the network interface device flags
  * 
  * @return != NULL: network interface device object
  *            NULL: get failed 
  */
-struct netdev *netdev_get_first_link_up(void)
+struct netdev *netdev_get_first_by_flags(uint16_t flags)
 {
     rt_base_t level;
     rt_slist_t *node = RT_NULL;
@@ -155,7 +157,7 @@ struct netdev *netdev_get_first_link_up(void)
     for (node = &(netdev_list->list); node; node = rt_slist_next(node))
     {
         netdev = rt_slist_entry(node, struct netdev, list);
-        if (netdev && netdev_is_up(netdev) && netdev_is_link_up(netdev))
+        if (netdev && (netdev->flags & flags) != 0)
         {
             rt_hw_interrupt_enable(level);
             return netdev;
@@ -269,7 +271,7 @@ struct netdev *netdev_get_by_family(int family)
     {
         netdev = rt_slist_entry(node, struct netdev, list);
         pf = (struct sal_proto_family *) netdev->sal_user_data;
-        if (pf && pf->skt_ops && pf->family == family && netdev_is_up(netdev) && netdev_is_link_up(netdev))
+        if (pf && pf->skt_ops && pf->family == family && netdev_is_up(netdev))
         {
             rt_hw_interrupt_enable(level);
             return netdev;
@@ -671,6 +673,23 @@ void netdev_low_level_set_dns_server(struct netdev *netdev, uint8_t dns_num, con
     }
 }
 
+#ifdef NETDEV_USING_AUTO_DEFAULT
+/* Change to the first link_up network interface device automatically */
+static void netdev_auto_change_default(struct netdev *netdev)
+{
+    struct netdev *new_netdev = RT_NULL;
+
+    if (rt_memcmp(netdev, netdev_default, sizeof(struct netdev)) == 0)
+    {
+        new_netdev = netdev_get_first_by_flags(NETDEV_FLAG_LINK_UP);
+        if (new_netdev)
+        {
+            netdev_set_default(new_netdev);
+        }
+    }
+}
+#endif /* NETDEV_USING_AUTO_DEFAULT */
+
 /**
  * This function will set network interface device status.
  * @NOTE it can only be called in the network interface device driver.
@@ -689,6 +708,11 @@ void netdev_low_level_set_status(struct netdev *netdev, rt_bool_t is_up)
         else
         {
             netdev->flags &= ~NETDEV_FLAG_UP;
+
+#ifdef NETDEV_USING_AUTO_DEFAULT
+            /* change to the first link_up network interface device automatically */
+            netdev_auto_change_default(netdev);
+#endif /* NETDEV_USING_AUTO_DEFAULT */
         }
 
         /* execute  network interface device status change callback function */
@@ -728,6 +752,11 @@ void netdev_low_level_set_link_status(struct netdev *netdev, rt_bool_t is_up)
             
             /* set network interface device flags to internet down */
             netdev->flags &= ~NETDEV_FLAG_INTERNET_UP;
+
+#ifdef NETDEV_USING_AUTO_DEFAULT
+            /* change to the first link_up network interface device automatically */
+            netdev_auto_change_default(netdev);
+#endif /* NETDEV_USING_AUTO_DEFAULT */
         }
 
         /* execute link status change callback function */
@@ -937,7 +966,7 @@ static int netdev_cmd_ping(char* target_name, rt_uint32_t times, rt_size_t size)
     else
     {
         /* using first internet up status network interface device */
-        netdev = netdev_get_first_link_up();
+        netdev = netdev_get_first_by_flags(NETDEV_FLAG_LINK_UP);
         if (netdev == RT_NULL || NETDEV_PING_IS_COMMONICABLE(netdev) == 0)
         {
             rt_kprintf("ping: network interface device get error.\n");