Commit 9d0d68fa authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller

team: fix mtu setting

Now it is not possible to set mtu to team device which has a port
enslaved to it. The reason is that when team_change_mtu() calls
dev_set_mtu() for port device, notificator for NETDEV_PRECHANGEMTU
event is called and team_device_event() returns NOTIFY_BAD forbidding
the change. So fix this by returning NOTIFY_DONE here in case team is
changing mtu in team_change_mtu().

Introduced-by: 3d249d4c "net: introduce ethernet teaming device"
Signed-off-by: default avatarJiri Pirko <>
Acked-by: default avatarFlavio Leitner <>
Signed-off-by: default avatarDavid S. Miller <>
parent 39c36094
......@@ -1724,6 +1724,7 @@ static int team_change_mtu(struct net_device *dev, int new_mtu)
* to traverse list in reverse under rcu_read_lock
team->port_mtu_change_allowed = true;
list_for_each_entry(port, &team->port_list, list) {
err = dev_set_mtu(port->dev, new_mtu);
if (err) {
......@@ -1732,6 +1733,7 @@ static int team_change_mtu(struct net_device *dev, int new_mtu)
goto unwind;
team->port_mtu_change_allowed = false;
dev->mtu = new_mtu;
......@@ -1741,6 +1743,7 @@ static int team_change_mtu(struct net_device *dev, int new_mtu)
list_for_each_entry_continue_reverse(port, &team->port_list, list)
dev_set_mtu(port->dev, dev->mtu);
team->port_mtu_change_allowed = false;
return err;
......@@ -2851,7 +2854,9 @@ static int team_device_event(struct notifier_block *unused,
/* Forbid to change mtu of underlaying device */
return NOTIFY_BAD;
if (!port->team->port_mtu_change_allowed)
return NOTIFY_BAD;
/* Forbid to change type of underlaying device */
return NOTIFY_BAD;
......@@ -194,6 +194,7 @@ struct team {
bool user_carrier_enabled;
bool queue_override_enabled;
struct list_head *qom_lists; /* array of queue override mapping lists */
bool port_mtu_change_allowed;
struct {
unsigned int count;
unsigned int interval; /* in ms */
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