netdev - [RFC PATCH net-next 3/9] net: export netdev_name_node

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Date:   Tue, 28 Sep 2021 14:54:54 +0200
From:   Antoine Tenart <atenart@...nel.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     Antoine Tenart <atenart@...nel.org>, pabeni@...hat.com,
        gregkh@...uxfoundation.org, ebiederm@...ssion.com,
        stephen@...workplumber.org, herbert@...dor.apana.org.au,
        juri.lelli@...hat.com, netdev@...r.kernel.org
Subject: [RFC PATCH net-next 3/9] net: export netdev_name_node_lookup

Export netdev_name_node_lookup for use outside of net/core/dev.c. Prior
to this __dev_get_by_name was used for both name collision detection and
to retrieve a net device reference. We now want to allow a difference in
behaviour between the two, hence exporting netdev_name_node_lookup. (It
will be used in the next commits).

Signed-off-by: Antoine Tenart <atenart@...nel.org>
---
 include/linux/netdevice.h | 2 ++
 net/core/dev.c            | 5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index d79163208dfd..f8dae47b9aa8 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2955,6 +2955,8 @@ struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags,
 struct net_device *dev_get_by_name(struct net *net, const char *name);
 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
 struct net_device *__dev_get_by_name(struct net *net, const char *name);
+struct netdev_name_node *netdev_name_node_lookup(struct net *net,
+						 const char *name);
 int dev_alloc_name(struct net_device *dev, const char *name);
 int dev_open(struct net_device *dev, struct netlink_ext_ack *extack);
 void dev_close(struct net_device *dev);
diff --git a/net/core/dev.c b/net/core/dev.c
index 2f28b70e5244..bfe17a264d6c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -279,8 +279,8 @@ static void netdev_name_node_del(struct netdev_name_node *name_node)
 	hlist_del_rcu(&name_node->hlist);
 }
 
-static struct netdev_name_node *netdev_name_node_lookup(struct net *net,
-							const char *name)
+struct netdev_name_node *netdev_name_node_lookup(struct net *net,
+						 const char *name)
 {
 	struct hlist_head *head = dev_name_hash(net, name);
 	struct netdev_name_node *name_node;
@@ -290,6 +290,7 @@ static struct netdev_name_node *netdev_name_node_lookup(struct net *net,
 			return name_node;
 	return NULL;
 }
+EXPORT_SYMBOL(netdev_name_node_lookup);
 
 static struct netdev_name_node *netdev_name_node_lookup_rcu(struct net *net,
 							    const char *name)
-- 
2.31.1