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devlink: change port event netdev notifier from per-net to global

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Currently only the network namespace of devlink instance is monitored
for port events. If netdev is moved to a different namespace and then
unregistered, NETDEV_PRE_UNINIT is missed which leads to trigger
following WARN_ON in devl_port_unregister().
WARN_ON(devlink_port->type != DEVLINK_PORT_TYPE_NOTSET);

Fix this by changing the netdev notifier from per-net to global so no
event is missed.

Fixes: 02a68a47ea ("net: devlink: track netdev with devlink_port assigned")
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20230206094151.2557264-1-jiri@resnulli.us
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jiri Pirko 2023-02-06 10:41:51 +01:00 committed by Paolo Abeni
parent bbb253b206
commit 565b4824c3
1 changed files with 6 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

9
net/core/devlink.c
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@ -9979,7 +9979,7 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
goto err_xa_alloc;
devlink->netdevice_nb.notifier_call = devlink_netdevice_event;
ret = register_netdevice_notifier_net(net, &devlink->netdevice_nb);
ret = register_netdevice_notifier(&devlink->netdevice_nb);
if (ret)
goto err_register_netdevice_notifier;
@ -10171,8 +10171,7 @@ void devlink_free(struct devlink *devlink)
xa_destroy(&devlink->snapshot_ids);
xa_destroy(&devlink->ports);
WARN_ON_ONCE(unregister_netdevice_notifier_net(devlink_net(devlink),
&devlink->netdevice_nb));
WARN_ON_ONCE(unregister_netdevice_notifier(&devlink->netdevice_nb));
xa_erase(&devlinks, devlink->index);
@ -10503,6 +10502,8 @@ static int devlink_netdevice_event(struct notifier_block *nb,
break;
case NETDEV_REGISTER:
case NETDEV_CHANGENAME:
if (devlink_net(devlink) != dev_net(netdev))
return NOTIFY_OK;
/* Set the netdev on top of previously set type. Note this
* event happens also during net namespace change so here
* we take into account netdev pointer appearing in this
@ -10512,6 +10513,8 @@ static int devlink_netdevice_event(struct notifier_block *nb,
netdev);
break;
case NETDEV_UNREGISTER:
if (devlink_net(devlink) != dev_net(netdev))
return NOTIFY_OK;
/* Clear netdev pointer, but not the type. This event happens
* also during net namespace change so we need to clear
* pointer to netdev that is going to another net namespace.