net: dsa: Restore MTU on master device on unload (91ba4795) · Commits · 戴 / test

A previous change tries to set the MTU on the master device to take into account the DSA overheads. This patch tries to reset the master device back to the default MTU. Signed-off-by:

Andrew Lunn <andrew@lunn.ch> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/dsa/master.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -172,6 +172,18 @@ void dsa_master_set_mtu(struct net_device dev, struct dsa_port cpu_dp)
		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)
		{
		dsa_master_set_mtu(dev, cpu_dp);
		@@ -190,6 +202,7 @@ int dsa_master_setup(struct net_device dev, struct dsa_port cpu_dp)
		void dsa_master_teardown(struct net_device *dev)
		{
		dsa_master_ethtool_teardown(dev);
		dsa_master_reset_mtu(dev);

		dev->dsa_ptr = NULL;

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