1 files changed, 16 insertions, 0 deletions

diff --git a/net/dsa/master.c b/net/dsa/master.c
index c90ee3227dea..42f525bc68e2 100644
--- a/net/dsa/master.c
+++ b/net/dsa/master.c
@@ -158,8 +158,24 @@ static void dsa_master_ethtool_teardown(struct net_device *dev)
         cpu_dp->orig_ethtool_ops = NULL;
 }
 
+void dsa_master_set_mtu(struct net_device *dev, struct dsa_port *cpu_dp)
+{
+        unsigned int mtu = ETH_DATA_LEN + cpu_dp->tag_ops->overhead;
+        int err;
+
+        rtnl_lock();
+        if (mtu <= dev->max_mtu) {
+                err = dev_set_mtu(dev, mtu);
+                if (err)
+                        netdev_dbg(dev, "Unable to set MTU to include for DSA overheads\n");
+        }
+        rtnl_unlock();
+}
+
 int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
 {
+        dsa_master_set_mtu(dev,  cpu_dp);
+
         /* If we use a tagging format that doesn't have an ethertype
          * field, make sure that all packets from this point on get
          * sent to the tag format's receive function.