bridge: make bridge support netpoll

Based on the previous patch, make bridge support netpoll by:

1) implement the 2 methods to support netpoll for bridge;

2) modify netpoll during forwarding packets via bridge;

3) disable netpoll support of bridge when a netpoll-unabled device
   is added to bridge;

4) enable netpoll support when all underlying devices support netpoll.

Cc: David Miller <davem@davemloft.net>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: WANG Cong <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 25 insertions, 0 deletions

diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 521439333316..537bdd60d9b9 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -13,6 +13,7 @@
 
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
+#include <linux/netpoll.h>
 #include <linux/ethtool.h>
 #include <linux/if_arp.h>
 #include <linux/module.h>
@@ -153,6 +154,14 @@ static void del_nbp(struct net_bridge_port *p)
         kobject_uevent(&p->kobj, KOBJ_REMOVE);
         kobject_del(&p->kobj);
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+        if (br_devices_support_netpoll(br))
+                br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
+        if (dev->netdev_ops->ndo_netpoll_cleanup)
+                dev->netdev_ops->ndo_netpoll_cleanup(dev);
+        else
+                dev->npinfo = NULL;
+#endif
         call_rcu(&p->rcu, destroy_nbp_rcu);
 }
 
@@ -165,6 +174,8 @@ static void del_br(struct net_bridge *br, struct list_head *head)
                 del_nbp(p);
         }
 
+        br_netpoll_cleanup(br->dev);
+
         del_timer_sync(&br->gc_timer);
 
         br_sysfs_delbr(br->dev);
@@ -444,6 +455,20 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
 
         kobject_uevent(&p->kobj, KOBJ_ADD);
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+        if (br_devices_support_netpoll(br)) {
+                br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
+                if (br->dev->npinfo)
+                        dev->npinfo = br->dev->npinfo;
+        } else if (!(br->dev->priv_flags & IFF_DISABLE_NETPOLL)) {
+                br->dev->priv_flags |= IFF_DISABLE_NETPOLL;
+                printk(KERN_INFO "New device %s does not support netpoll\n",
+                        dev->name);
+                printk(KERN_INFO "Disabling netpoll for %s\n",
+                        br->dev->name);
+        }
+#endif
+
         return 0;
 err2:
         br_fdb_delete_by_port(br, p, 1);