netdev - [patch net-next 1/3] net: devlink: export devlink net setter

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Message-Id: <20191005061033.24235-2-jiri@resnulli.us>
Date:   Sat,  5 Oct 2019 08:10:31 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, idosch@...lanox.com,
        jakub.kicinski@...ronome.com, petrm@...lanox.com,
        tariqt@...lanox.com, saeedm@...lanox.com, shuah@...nel.org,
        mlxsw@...lanox.com
Subject: [patch net-next 1/3] net: devlink: export devlink net setter

From: Jiri Pirko <jiri@...lanox.com>

For newly allocated devlink instance allow drivers to set net struct

Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 include/net/devlink.h |  2 ++
 net/core/devlink.c    | 15 ++++++++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index 3c9d4a063c98..4095657fc23f 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -39,6 +39,7 @@ struct devlink {
 	possible_net_t _net;
 	struct mutex lock;
 	bool reload_failed;
+	bool registered;
 	char priv[0] __aligned(NETDEV_ALIGN);
 };
 
@@ -772,6 +773,7 @@ static inline struct devlink *netdev_to_devlink(struct net_device *dev)
 struct ib_device;
 
 struct net *devlink_net(const struct devlink *devlink);
+void devlink_net_set(struct devlink *devlink, struct net *net);
 struct devlink *devlink_alloc(const struct devlink_ops *ops, size_t priv_size);
 int devlink_register(struct devlink *devlink, struct device *dev);
 void devlink_unregister(struct devlink *devlink);
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 6d16908f34b0..c628083cdf14 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -101,11 +101,19 @@ struct net *devlink_net(const struct devlink *devlink)
 }
 EXPORT_SYMBOL_GPL(devlink_net);
 
-static void devlink_net_set(struct devlink *devlink, struct net *net)
+static void __devlink_net_set(struct devlink *devlink, struct net *net)
 {
 	write_pnet(&devlink->_net, net);
 }
 
+void devlink_net_set(struct devlink *devlink, struct net *net)
+{
+	if (WARN_ON(devlink->registered))
+		return;
+	__devlink_net_set(devlink, net);
+}
+EXPORT_SYMBOL_GPL(devlink_net_set);
+
 static struct devlink *devlink_get_from_attrs(struct net *net,
 					      struct nlattr **attrs)
 {
@@ -2750,7 +2758,7 @@ static void devlink_reload_netns_change(struct devlink *devlink,
 				     DEVLINK_CMD_PARAM_DEL);
 	devlink_notify(devlink, DEVLINK_CMD_DEL);
 
-	devlink_net_set(devlink, dest_net);
+	__devlink_net_set(devlink, dest_net);
 
 	devlink_notify(devlink, DEVLINK_CMD_NEW);
 	list_for_each_entry(param_item, &devlink->param_list, list)
@@ -6278,7 +6286,7 @@ struct devlink *devlink_alloc(const struct devlink_ops *ops, size_t priv_size)
 	if (!devlink)
 		return NULL;
 	devlink->ops = ops;
-	devlink_net_set(devlink, &init_net);
+	__devlink_net_set(devlink, &init_net);
 	INIT_LIST_HEAD(&devlink->port_list);
 	INIT_LIST_HEAD(&devlink->sb_list);
 	INIT_LIST_HEAD_RCU(&devlink->dpipe_table_list);
@@ -6304,6 +6312,7 @@ int devlink_register(struct devlink *devlink, struct device *dev)
 {
 	mutex_lock(&devlink_mutex);
 	devlink->dev = dev;
+	devlink->registered = true;
 	list_add_tail(&devlink->list, &devlink_list);
 	devlink_notify(devlink, DEVLINK_CMD_NEW);
 	mutex_unlock(&devlink_mutex);
-- 
2.21.0