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Diffstat (limited to 'net/bridge/br_if.c')
-rw-r--r--net/bridge/br_if.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 9ba4ed65c52b..48dc4d2e2be3 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -424,8 +424,18 @@ 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 */
-int br_min_mtu(const struct net_bridge *br)
+static int __br_mtu(const struct net_bridge *br, bool (compare_fn)(int, int))
{
const struct net_bridge_port *p;
int mtu = 0;
@@ -436,13 +446,21 @@ int br_min_mtu(const struct net_bridge *br)
mtu = ETH_DATA_LEN;
else {
list_for_each_entry(p, &br->port_list, list) {
- if (!mtu || p->dev->mtu < mtu)
+ if (!mtu || compare_fn(p->dev->mtu, mtu))
mtu = p->dev->mtu;
}
}
return mtu;
}
+int br_mtu(const struct net_bridge *br)
+{
+ if (br->vlan_enabled)
+ return __br_mtu(br, max_mtu);
+ else
+ return __br_mtu(br, min_mtu);
+}
+
static void br_set_gso_limits(struct net_bridge *br)
{
unsigned int gso_max_size = GSO_MAX_SIZE;
@@ -594,7 +612,7 @@ 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_min_mtu(br));
+ dev_set_mtu(br->dev, br_mtu(br));
br_set_gso_limits(br);
kobject_uevent(&p->kobj, KOBJ_ADD);
@@ -641,7 +659,7 @@ int br_del_if(struct net_bridge *br, struct net_device *dev)
*/
del_nbp(p);
- dev_set_mtu(br->dev, br_min_mtu(br));
+ dev_set_mtu(br->dev, br_mtu(br));
br_set_gso_limits(br);
spin_lock_bh(&br->lock);