diff options
Diffstat (limited to 'net/dsa/master.c')
| -rw-r--r-- | net/dsa/master.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/net/dsa/master.c b/net/dsa/master.c index 5e8c9bef78bd..71bb15f491c8 100644 --- a/net/dsa/master.c +++ b/net/dsa/master.c @@ -179,10 +179,38 @@ static const struct attribute_group dsa_group = { .attrs = dsa_slave_attrs, }; +static 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(); +} + +static void dsa_master_reset_mtu(struct net_device *dev) +{ + int err; + + rtnl_lock(); + err = dev_set_mtu(dev, ETH_DATA_LEN); + if (err) + netdev_dbg(dev, + "Unable to reset MTU to exclude DSA overheads\n"); + rtnl_unlock(); +} + int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp) { int ret; + 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. @@ -206,6 +234,7 @@ void dsa_master_teardown(struct net_device *dev) { sysfs_remove_group(&dev->dev.kobj, &dsa_group); dsa_master_ethtool_teardown(dev); + dsa_master_reset_mtu(dev); dev->dsa_ptr = NULL; |