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net: dsa: refine netdev event notifier 

Rework the netdev event handler, similar to what the Mellanox Spectrum
driver does, to easily welcome more events later (for example
NETDEV_PRECHANGEUPPER) and use netdev helpers (such as
netif_is_bridge_master).

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2016-03-13 16:21:34 -04:00 committed by David S. Miller
parent 16bfa7024e
commit 6debb68a2d
1 changed files with 31 additions and 25 deletions
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56
net/dsa/slave.c
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@ -451,7 +451,7 @@ static int dsa_slave_bridge_port_join(struct net_device *dev,
if (ds->drv->port_bridge_join)
ret = ds->drv->port_bridge_join(ds, p->port, br);
return ret;
return ret == -EOPNOTSUPP ? 0 : ret;
}
static void dsa_slave_bridge_port_leave(struct net_device *dev)
@ -1143,40 +1143,46 @@ static bool dsa_slave_dev_check(struct net_device *dev)
return dev->netdev_ops == &dsa_slave_netdev_ops;
}
static int dsa_slave_master_changed(struct net_device *dev)
static int dsa_slave_port_upper_event(struct net_device *dev,
unsigned long event, void *ptr)
{
struct net_device *master = netdev_master_upper_dev_get(dev);
struct dsa_slave_priv *p = netdev_priv(dev);
struct netdev_notifier_changeupper_info *info = ptr;
struct net_device *upper = info->upper_dev;
int err = 0;
if (master && master->rtnl_link_ops &&
!strcmp(master->rtnl_link_ops->kind, "bridge"))
err = dsa_slave_bridge_port_join(dev, master);
else if (dsa_port_is_bridged(p))
dsa_slave_bridge_port_leave(dev);
switch (event) {
case NETDEV_CHANGEUPPER:
if (netif_is_bridge_master(upper)) {
if (info->linking)
err = dsa_slave_bridge_port_join(dev, upper);
else
dsa_slave_bridge_port_leave(dev);
}
return err;
break;
}
return notifier_from_errno(err);
}
static int dsa_slave_port_event(struct net_device *dev, unsigned long event,
void *ptr)
{
switch (event) {
case NETDEV_CHANGEUPPER:
return dsa_slave_port_upper_event(dev, event, ptr);
}
return NOTIFY_DONE;
}
int dsa_slave_netdevice_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev;
int err = 0;
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
switch (event) {
case NETDEV_CHANGEUPPER:
dev = netdev_notifier_info_to_dev(ptr);
if (!dsa_slave_dev_check(dev))
goto out;
if (dsa_slave_dev_check(dev))
return dsa_slave_port_event(dev, event, ptr);
err = dsa_slave_master_changed(dev);
if (err && err != -EOPNOTSUPP)
netdev_warn(dev, "failed to reflect master change\n");
break;
}
out:
return NOTIFY_DONE;
}