Commit b2243b36 authored by Vladimir Oltean's avatar Vladimir Oltean Committed by David S. Miller

net: dsa: Call driver's setup callback after setting up its switchdev notifier

This allows the driver to perform some manipulations of its own during
setup, using generic switchdev calls. Having the notifiers registered at
setup time is important because otherwise any switchdev transaction
emitted during this time would be ignored (dispatched to an empty call
chain).

One current usage scenario is for the driver to request DSA to set up
802.1Q based switch tagging for its ports.

There is no danger for the driver setup code to start racing now with
switchdev events emitted from the network stack (such as bridge core)
even if the notifier is registered earlier. This is because the network
stack needs a net_device as a vehicle to perform switchdev operations,
and the slave net_devices are registered later than the core driver
setup anyway (ds->ops->setup in dsa_switch_setup vs dsa_port_setup).

Luckily DSA doesn't need a net_device to carry out switchdev callbacks,
and therefore drivers shouldn't assume either that net_devices are
available at the time their switchdev callbacks get invoked.
Signed-off-by: default avatarVladimir Oltean <olteanv@gmail.com>
Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>-
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e7ba0fad
...@@ -371,14 +371,14 @@ static int dsa_switch_setup(struct dsa_switch *ds) ...@@ -371,14 +371,14 @@ static int dsa_switch_setup(struct dsa_switch *ds)
if (err) if (err)
return err; return err;
err = ds->ops->setup(ds);
if (err < 0)
return err;
err = dsa_switch_register_notifier(ds); err = dsa_switch_register_notifier(ds);
if (err) if (err)
return err; return err;
err = ds->ops->setup(ds);
if (err < 0)
return err;
if (!ds->slave_mii_bus && ds->ops->phy_read) { if (!ds->slave_mii_bus && ds->ops->phy_read) {
ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev); ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
if (!ds->slave_mii_bus) if (!ds->slave_mii_bus)
......
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