@@ -508,26 +508,31 @@ static void team_set_no_mode(struct team *team)
team->mode = &__team_no_mode;
}
-static void team_adjust_ops(struct team *team)
+static void __team_adjust_ops(struct team *team, int en_port_count)
{
/*
* To avoid checks in rx/tx skb paths, ensure here that non-null and
* correct ops are always set.
*/
- if (list_empty(&team->port_list) ||
- !team_is_mode_set(team) || !team->mode->ops->transmit)
+ if (!en_port_count || !team_is_mode_set(team) ||
+ !team->mode->ops->transmit)
team->ops.transmit = team_dummy_transmit;
else
team->ops.transmit = team->mode->ops->transmit;
- if (list_empty(&team->port_list) ||
- !team_is_mode_set(team) || !team->mode->ops->receive)
+ if (!en_port_count || !team_is_mode_set(team) ||
+ !team->mode->ops->receive)
team->ops.receive = team_dummy_receive;
else
team->ops.receive = team->mode->ops->receive;
}
+static void team_adjust_ops(struct team *team)
+{
+ __team_adjust_ops(team, team->en_port_count);
+}
+
/*
* We can benefit from the fact that it's ensured no port is present
* at the time of mode change. Therefore no packets are in fly so there's no
@@ -687,6 +692,7 @@ static void team_port_enable(struct team *team,
port->index = team->en_port_count++;
hlist_add_head_rcu(&port->hlist,
team_port_index_hash(team, port->index));
+ team_adjust_ops(team);
if (team->ops.port_enabled)
team->ops.port_enabled(team, port);
}
@@ -708,16 +714,20 @@ static void __reconstruct_port_hlist(struct team *team, int rm_index)
static void team_port_disable(struct team *team,
struct team_port *port)
{
- int rm_index = port->index;
-
if (!team_port_enabled(port))
return;
if (team->ops.port_disabled)
team->ops.port_disabled(team, port);
hlist_del_rcu(&port->hlist);
- __reconstruct_port_hlist(team, rm_index);
- team->en_port_count--;
+ __reconstruct_port_hlist(team, port->index);
port->index = -1;
+ __team_adjust_ops(team, team->en_port_count - 1);
+ /*
+ * Wait until readers see adjusted ops. This ensures that
+ * readers never see team->en_port_count == 0
+ */
+ synchronize_rcu();
+ team->en_port_count--;
}
#define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
@@ -874,7 +884,6 @@ static int team_port_add(struct team *team, struct net_device *port_dev)
port->index = -1;
team_port_enable(team, port);
list_add_tail_rcu(&port->list, &team->port_list);
- team_adjust_ops(team);
__team_compute_features(team);
__team_port_change_check(port, !!netif_carrier_ok(port_dev));
__team_options_change_check(team);
@@ -928,7 +937,6 @@ static int team_port_del(struct team *team, struct net_device *port_dev)
__team_port_change_check(port, false);
team_port_disable(team, port);
list_del_rcu(&port->list);
- team_adjust_ops(team);
netdev_rx_handler_unregister(port_dev);
netdev_set_master(port_dev, NULL);
vlan_vids_del_by_dev(port_dev, dev);
team_adjust_ops should check for enabled ports, not all ports. This may lead to division by zero. This patch fixes this. Signed-off-by: Jiri Pirko <jpirko@redhat.com> --- drivers/net/team/team.c | 30 +++++++++++++++++++----------- 1 file changed, 19 insertions(+), 11 deletions(-)