netdev - Re: [Patch net] ipv6: reorder ip6_route_dev_notifier after ipv6_dev

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Date:   Thu, 4 May 2017 08:00:20 -0600
From:   David Ahern <dsahern@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Cc:     andreyknvl@...gle.com
Subject: Re: [Patch net] ipv6: reorder ip6_route_dev_notifier after
 ipv6_dev_notf

On 5/3/17 11:07 PM, Cong Wang wrote:
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index 2f11366..4dbf7e2 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -4024,7 +4024,7 @@ static struct pernet_operations ip6_route_net_late_ops = {
>  
>  static struct notifier_block ip6_route_dev_notifier = {
>  	.notifier_call = ip6_route_dev_notify,
> -	.priority = 0,
> +	.priority = -10, /* Must be called after addrconf_notify!! */
>  };
>  
>  void __init ip6_route_init_special_entries(void)
> 

That should be codified such that if someone changes the priority of the
addrconf notifier, it fixes up the route notifier as well. e.g.,

diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 1aeb25dd42a7..6c0ee3ccbe0f 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -20,6 +20,8 @@
 #define ADDRCONF_TIMER_FUZZ            (HZ / 4)
 #define ADDRCONF_TIMER_FUZZ_MAX                (HZ)
+#define ADDRCONF_NOTIFY_PRIORITY       0
+
 #include <linux/in.h>
 #include <linux/in6.h>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a2a370b71249..7a4e6b2996a1 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3548,6 +3548,7 @@ static int addrconf_notify(struct notifier_block
*this, unsigned long event,
  */
 static struct notifier_block ipv6_dev_notf = {
        .notifier_call = addrconf_notify,
+       .priority      = ADDRCONF_NOTIFY_PRIORITY,
 };

 static void addrconf_type_change(struct net_device *dev, unsigned long
event)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a1bf426c959b..e0d83f8bc01a 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -4024,7 +4024,7 @@ static struct pernet_operations
ip6_route_net_late_ops = {

 static struct notifier_block ip6_route_dev_notifier = {
        .notifier_call = ip6_route_dev_notify,
-       .priority = 0,
+       .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
 };


And you marked this as a patch for net; I think this should go into
net-next.