net: introduce NETDEV_UNREGISTER_PERNET

This new event is called once for each unique net namespace in batched
unregister operations (with the argument set to a random device from
that namespace) and once per device in non-batched unregister
operations.

It allows us to factorize some device unregister work such as clearing the
routing cache.

Signed-off-by: Octavian Purdila <opurdila@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index 29714b8441b1..b0c3671d463c 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -202,6 +202,7 @@ static inline int notifier_to_errno(int ret)
 #define NETDEV_BONDING_OLDTYPE  0x000E
 #define NETDEV_BONDING_NEWTYPE  0x000F
 #define NETDEV_POST_INIT        0x0010
+#define NETDEV_UNREGISTER_PERNET 0x0011
 
 #define SYS_DOWN        0x0001  /* Notify of system down */
 #define SYS_RESTART     SYS_DOWN