[PATCH net-next v26 04/23] ovpn: keep carrier always on for MP interfaces

[Antonio Quartulli]

An ovpn interface configured in MP mode will keep carrier always
on and let the user decide when to bring it administratively up and
down.

This way a MP node (i.e. a server) will keep its interface always
up and running, even when no peer is connected.

Signed-off-by: Antonio Quartulli <antonio@xxxxxxxxxxx>
---
 drivers/net/ovpn/main.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ovpn/main.c b/drivers/net/ovpn/main.c
index ea7dad374c0088cab46282c61cd8fef65bab0d5c..fa1dd84be24060d6dc749dc9e097f166a7adea26 100644
--- a/drivers/net/ovpn/main.c
+++ b/drivers/net/ovpn/main.c
@@ -93,10 +93,18 @@ static int ovpn_newlink(struct net_device *dev,
 	ovpn->dev = dev;
 	ovpn->mode = mode;
 
-	/* turn carrier explicitly off after registration, this way state is
-	 * clearly defined
+	/* Set carrier explicitly after registration, this way state is
+	 * clearly defined.
+	 *
+	 * In case of MP interfaces we keep the carrier always on.
+	 *
+	 * Carrier for P2P interfaces is initially off and it is then
+	 * switched on and off when the remote peer is added or deleted.
 	 */
-	netif_carrier_off(dev);
+	if (ovpn->mode == OVPN_MODE_MP)
+		netif_carrier_on(dev);
+	else
+		netif_carrier_off(dev);
 
 	return register_netdevice(dev);
 }

-- 
2.49.0