92 lines
2.8 KiB
Diff
92 lines
2.8 KiB
Diff
From a1ff94c2973c43bc1e2677ac63ebb15b1d1ff846 Mon Sep 17 00:00:00 2001
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From: Vladimir Oltean <vladimir.oltean@nxp.com>
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Date: Thu, 6 Jan 2022 01:11:14 +0200
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Subject: [PATCH 3/6] net: dsa: stop updating master MTU from master.c
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At present there are two paths for changing the MTU of the DSA master.
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The first is:
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dsa_tree_setup
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-> dsa_tree_setup_ports
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-> dsa_port_setup
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-> dsa_slave_create
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-> dsa_slave_change_mtu
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-> dev_set_mtu(master)
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The second is:
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dsa_tree_setup
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-> dsa_tree_setup_master
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-> dsa_master_setup
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-> dev_set_mtu(dev)
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So the dev_set_mtu() call from dsa_master_setup() has been effectively
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superseded by the dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN) that is
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done from dsa_slave_create() for each user port. The later function also
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updates the master MTU according to the largest user port MTU from the
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tree. Therefore, updating the master MTU through a separate code path
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isn't needed.
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Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/dsa/master.c | 25 +------------------------
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1 file changed, 1 insertion(+), 24 deletions(-)
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--- a/net/dsa/master.c
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+++ b/net/dsa/master.c
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@@ -329,28 +329,13 @@ static const struct attribute_group dsa_
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.attrs = dsa_slave_attrs,
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};
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-static void dsa_master_reset_mtu(struct net_device *dev)
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-{
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- int err;
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-
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- rtnl_lock();
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- err = dev_set_mtu(dev, ETH_DATA_LEN);
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- if (err)
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- netdev_dbg(dev,
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- "Unable to reset MTU to exclude DSA overheads\n");
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- rtnl_unlock();
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-}
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-
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static struct lock_class_key dsa_master_addr_list_lock_key;
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int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
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{
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- const struct dsa_device_ops *tag_ops = cpu_dp->tag_ops;
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struct dsa_switch *ds = cpu_dp->ds;
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struct device_link *consumer_link;
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- int mtu, ret;
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-
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- mtu = ETH_DATA_LEN + dsa_tag_protocol_overhead(tag_ops);
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+ int ret;
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/* The DSA master must use SET_NETDEV_DEV for this to work. */
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consumer_link = device_link_add(ds->dev, dev->dev.parent,
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@@ -360,13 +345,6 @@ int dsa_master_setup(struct net_device *
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"Failed to create a device link to DSA switch %s\n",
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dev_name(ds->dev));
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- rtnl_lock();
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- ret = dev_set_mtu(dev, mtu);
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- rtnl_unlock();
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- if (ret)
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- netdev_warn(dev, "error %d setting MTU to %d to include DSA overhead\n",
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- ret, mtu);
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-
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/* If we use a tagging format that doesn't have an ethertype
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* field, make sure that all packets from this point on get
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* sent to the tag format's receive function.
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@@ -404,7 +382,6 @@ void dsa_master_teardown(struct net_devi
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sysfs_remove_group(&dev->dev.kobj, &dsa_group);
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dsa_netdev_ops_set(dev, NULL);
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dsa_master_ethtool_teardown(dev);
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- dsa_master_reset_mtu(dev);
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dsa_master_set_promiscuity(dev, -1);
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dev->dsa_ptr = NULL;
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