bonding: remap muticast addresses without using dev_close() and dev_open()

This patch fixes commit e36b9d16c6a6d0f59803b3ef04ff3c22c3844c10. The approach
there is to call dev_close()/dev_open() whenever the device type is changed in
order to remap the device IP multicast addresses to HW multicast addresses.
This approach suffers from 2 drawbacks:

*. It assumes tha the device is UP when calling dev_close(), or otherwise
   dev_close() has no affect. It is worth to mention that initscripts (Redhat)
   and sysconfig (Suse) doesn't act the same in this matter. 
*. dev_close() has other side affects, like deleting entries from the routing
   table, which might be unnecessary.

The fix here is to directly remap the IP multicast addresses to HW multicast
addresses for a bonding device that changes its type, and nothing else.
   
Reported-by:   Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Moni Shoua <monis@voltaire.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 8 insertions, 1 deletions

diff --git a/include/linux/igmp.h b/include/linux/igmp.h
index 92fbd8cbd68f..fe158e0e20e6 100644
--- a/include/linux/igmp.h
+++ b/include/linux/igmp.h
@@ -233,6 +233,8 @@ extern void ip_mc_init_dev(struct in_device *);
 extern void ip_mc_destroy_dev(struct in_device *);
 extern void ip_mc_up(struct in_device *);
 extern void ip_mc_down(struct in_device *);
+extern void ip_mc_unmap(struct in_device *);
+extern void ip_mc_remap(struct in_device *);
 extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
 extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
 extern void ip_mc_rejoin_group(struct ip_mc_list *im);
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 65ee1929b2b1..f46db6c7a734 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1873,7 +1873,8 @@ extern void		__dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct
 extern int              dev_set_promiscuity(struct net_device *dev, int inc);
 extern int              dev_set_allmulti(struct net_device *dev, int inc);
 extern void             netdev_state_change(struct net_device *dev);
-extern void             netdev_bonding_change(struct net_device *dev);
+extern void             netdev_bonding_change(struct net_device *dev,
+                                              unsigned long event);
 extern void             netdev_features_change(struct net_device *dev);
 /* Load a device via the kmod */
 extern void             dev_load(struct net *net, const char *name);
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index 81bc252dc8ac..44428d247dbe 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -199,6 +199,8 @@ static inline int notifier_to_errno(int ret)
 #define NETDEV_FEAT_CHANGE      0x000B
 #define NETDEV_BONDING_FAILOVER 0x000C
 #define NETDEV_PRE_UP           0x000D
+#define NETDEV_BONDING_OLDTYPE  0x000E
+#define NETDEV_BONDING_NEWTYPE  0x000F
 
 #define SYS_DOWN        0x0001  /* Notify of system down */
 #define SYS_RESTART     SYS_DOWN
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 7b55ab215a64..0f7c37825fc1 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -143,6 +143,8 @@ extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr
 extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 extern void ipv6_mc_up(struct inet6_dev *idev);
 extern void ipv6_mc_down(struct inet6_dev *idev);
+extern void ipv6_mc_unmap(struct inet6_dev *idev);
+extern void ipv6_mc_remap(struct inet6_dev *idev);
 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);