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net: introduce a helper to move notifier block to different namespace

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Currently, net_dev() netdev notifier variant follows the netdev with
per-net notifier from namespace to namespace. This is implemented
by move_netdevice_notifiers_dev_net() helper.

For devlink it is needed to re-register per-net notifier during
devlink reload. Introduce a new helper called
move_netdevice_notifier_net() and share the unregister/register code
with existing move_netdevice_notifiers_dev_net() helper.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jiri Pirko 2022-11-08 14:22:06 +01:00 committed by Jakub Kicinski
parent 154ba79c9f
commit 3e52fba03a
2 changed files with 20 additions and 4 deletions
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2
include/linux/netdevice.h
View File

@ -2826,6 +2826,8 @@ int unregister_netdevice_notifier(struct notifier_block *nb);
int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb);
int unregister_netdevice_notifier_net(struct net *net,
struct notifier_block *nb);
void move_netdevice_notifier_net(struct net *src_net, struct net *dst_net,
struct notifier_block *nb);
int register_netdevice_notifier_dev_net(struct net_device *dev,
struct notifier_block *nb,
struct netdev_net_notifier *nn);

22
net/core/dev.c
View File

@ -1861,6 +1861,22 @@ int unregister_netdevice_notifier_net(struct net *net,
}
EXPORT_SYMBOL(unregister_netdevice_notifier_net);
static void __move_netdevice_notifier_net(struct net *src_net,
struct net *dst_net,
struct notifier_block *nb)
{
__unregister_netdevice_notifier_net(src_net, nb);
__register_netdevice_notifier_net(dst_net, nb, true);
}
void move_netdevice_notifier_net(struct net *src_net, struct net *dst_net,
struct notifier_block *nb)
{
rtnl_lock();
__move_netdevice_notifier_net(src_net, dst_net, nb);
rtnl_unlock();
}
int register_netdevice_notifier_dev_net(struct net_device *dev,
struct notifier_block *nb,
struct netdev_net_notifier *nn)
@ -1897,10 +1913,8 @@ static void move_netdevice_notifiers_dev_net(struct net_device *dev,
{
struct netdev_net_notifier *nn;
list_for_each_entry(nn, &dev->net_notifier_list, list) {
__unregister_netdevice_notifier_net(dev_net(dev), nn->nb);
__register_netdevice_notifier_net(net, nn->nb, true);
}
list_for_each_entry(nn, &dev->net_notifier_list, list)
__move_netdevice_notifier_net(dev_net(dev), net, nn->nb);
}
/**