net: add netdev->up protected by netdev_lock()

Some uAPI (netdev netlink) hide net_device's sub-objects while
the interface is down to ensure uniform behavior across drivers.
To remove the rtnl_lock dependency from those uAPIs we need a way
to safely tell if the device is down or up.

Add an indication of whether device is open or closed, protected
by netdev->lock. The semantics are the same as IFF_UP, but taking
netdev_lock around every write to ->flags would be a lot of code
churn.

We don't want to blanket the entire open / close path by netdev_lock,
because it will prevent us from applying it to specific structures -
core helpers won't be able to take that lock from any function
called by the drivers on open/close paths.

So the state of the flag is "pessimistic", as in it may report false
negatives, but never false positives.

Reviewed-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250115035319.559603-5-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/net/core/dev.h b/net/core/dev.h
index 25ae732c0775..ef37e2dd44f4 100644
--- a/net/core/dev.h
+++ b/net/core/dev.h
@@ -128,6 +128,18 @@ void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
 void unregister_netdevice_many_notify(struct list_head *head,
 				      u32 portid, const struct nlmsghdr *nlh);
 
+static inline void netif_set_up(struct net_device *dev, bool value)
+{
+	if (value)
+		dev->flags |= IFF_UP;
+	else
+		dev->flags &= ~IFF_UP;
+
+	netdev_lock(dev);
+	dev->up = value;
+	netdev_unlock(dev);
+}
+
 static inline void netif_set_gso_max_size(struct net_device *dev,
 					  unsigned int size)
 {