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-rw-r--r--net/bridge/br.c2
-rw-r--r--net/bridge/br_device.c3
-rw-r--r--net/bridge/br_if.c43
-rw-r--r--net/bridge/br_private.h2
4 files changed, 18 insertions, 32 deletions
diff --git a/net/bridge/br.c b/net/bridge/br.c
index 26e1616b2c90..565ff055813b 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -52,7 +52,7 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v
switch (event) {
case NETDEV_CHANGEMTU:
- dev_set_mtu(br->dev, br_mtu(br));
+ dev_set_mtu(br->dev, br_mtu(br, false));
break;
case NETDEV_CHANGEADDR:
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 278fc999d355..edb9967eb165 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -224,7 +224,8 @@ static void br_get_stats64(struct net_device *dev,
static int br_change_mtu(struct net_device *dev, int new_mtu)
{
struct net_bridge *br = netdev_priv(dev);
- if (new_mtu > br_mtu(br))
+
+ if (new_mtu > br_mtu(br, br_vlan_enabled(dev)))
return -EINVAL;
dev->mtu = new_mtu;
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 87b2afd455c7..7d5dc5a91084 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -424,41 +424,26 @@ int br_del_bridge(struct net *net, const char *name)
return ret;
}
-static bool min_mtu(int a, int b)
-{
- return a < b ? 1 : 0;
-}
-
-static bool max_mtu(int a, int b)
-{
- return a > b ? 1 : 0;
-}
-
-/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
-static int __br_mtu(const struct net_bridge *br, bool (compare_fn)(int, int))
+/* MTU of the bridge pseudo-device: ETH_DATA_LEN if there are no ports, the
+ * minimum of the ports if @max is false or the maximum if it's true
+ */
+int br_mtu(const struct net_bridge *br, bool max)
{
const struct net_bridge_port *p;
- int mtu = 0;
+ int ret_mtu = 0;
ASSERT_RTNL();
- if (list_empty(&br->port_list))
- mtu = ETH_DATA_LEN;
- else {
- list_for_each_entry(p, &br->port_list, list) {
- if (!mtu || compare_fn(p->dev->mtu, mtu))
- mtu = p->dev->mtu;
+ list_for_each_entry(p, &br->port_list, list) {
+ if (!max) {
+ if (!ret_mtu || ret_mtu > p->dev->mtu)
+ ret_mtu = p->dev->mtu;
+ } else if (p->dev->mtu > ret_mtu) {
+ ret_mtu = p->dev->mtu;
}
}
- return mtu;
-}
-int br_mtu(const struct net_bridge *br)
-{
- if (br_vlan_enabled(br->dev))
- return __br_mtu(br, max_mtu);
- else
- return __br_mtu(br, min_mtu);
+ return ret_mtu ? ret_mtu : ETH_DATA_LEN;
}
static void br_set_gso_limits(struct net_bridge *br)
@@ -612,7 +597,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev,
if (changed_addr)
call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
- dev_set_mtu(br->dev, br_mtu(br));
+ dev_set_mtu(br->dev, br_mtu(br, false));
br_set_gso_limits(br);
kobject_uevent(&p->kobj, KOBJ_ADD);
@@ -659,7 +644,7 @@ int br_del_if(struct net_bridge *br, struct net_device *dev)
*/
del_nbp(p);
- dev_set_mtu(br->dev, br_mtu(br));
+ dev_set_mtu(br->dev, br_mtu(br, false));
br_set_gso_limits(br);
spin_lock_bh(&br->lock);
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 048d5b51813b..586f84b9670d 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -578,7 +578,7 @@ int br_del_bridge(struct net *net, const char *name);
int br_add_if(struct net_bridge *br, struct net_device *dev,
struct netlink_ext_ack *extack);
int br_del_if(struct net_bridge *br, struct net_device *dev);
-int br_mtu(const struct net_bridge *br);
+int br_mtu(const struct net_bridge *br, bool max);
netdev_features_t br_features_recompute(struct net_bridge *br,
netdev_features_t features);
void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);