[NET]: Rework dev_base via list_head (v3)

Cleanup of dev_base list use, with the aim to simplify making device
list per-namespace. In almost every occasion, use of dev_base variable
and dev->next pointer could be easily replaced by for_each_netdev
loop. A few most complicated places were converted to using
first_netdev()/next_netdev().

Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Acked-by: Kirill Korotaev <dev@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 2 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4428f1c3c13c..30446222b396 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -304,7 +304,7 @@ struct net_device
 
         unsigned long           state;
 
-        struct net_device       *next;
+        struct list_head        dev_list;
         
         /* The device initialization function. Called only once. */
         int                     (*init)(struct net_device *dev);
@@ -575,9 +575,31 @@ struct packet_type {
 #include <linux/notifier.h>
 
 extern struct net_device                loopback_dev;           /* The loopback */
-extern struct net_device                *dev_base;              /* All devices */
+extern struct list_head                 dev_base_head;          /* All devices */
 extern rwlock_t                         dev_base_lock;          /* Device list lock */
 
+#define for_each_netdev(d)              \
+                list_for_each_entry(d, &dev_base_head, dev_list)
+#define for_each_netdev_safe(d, n)      \
+                list_for_each_entry_safe(d, n, &dev_base_head, dev_list)
+#define for_each_netdev_continue(d)             \
+                list_for_each_entry_continue(d, &dev_base_head, dev_list)
+#define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
+
+static inline struct net_device *next_net_device(struct net_device *dev)
+{
+        struct list_head *lh;
+
+        lh = dev->dev_list.next;
+        return lh == &dev_base_head ? NULL : net_device_entry(lh);
+}
+
+static inline struct net_device *first_net_device(void)
+{
+        return list_empty(&dev_base_head) ? NULL :
+                net_device_entry(dev_base_head.next);
+}
+
 extern int                      netdev_boot_setup_check(struct net_device *dev);
 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 extern struct net_device    *dev_getbyhwaddr(unsigned short type, char *hwaddr);