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Subject[PATCH net-next v2 4/4] net: dsa: Setup dsa_netdev_ops
Date
Now that we have all the infrastructure in place for calling into the
dsa_ptr->netdev_ops function pointers, install them when we configure
the DSA CPU/management interface and tear them down. The flow is
unchanged from before, but now we preserve equality of tests when
network device drivers do tests like dev->netdev_ops == &foo_ops which
was not the case before since we were allocating an entirely new
structure.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
include/net/dsa.h | 1 -
net/dsa/master.c | 52 ++++++++++++-----------------------------------
2 files changed, 13 insertions(+), 40 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 343642ca4f63..f1b63d06d132 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -230,7 +230,6 @@ struct dsa_port {
* Original copy of the master netdev net_device_ops
*/
const struct dsa_netdevice_ops *netdev_ops;
- const struct net_device_ops *orig_ndo_ops;

bool setup;
};
diff --git a/net/dsa/master.c b/net/dsa/master.c
index 480a61460c23..0a90911ae31b 100644
--- a/net/dsa/master.c
+++ b/net/dsa/master.c
@@ -220,12 +220,17 @@ static int dsa_master_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
break;
}

- if (cpu_dp->orig_ndo_ops && cpu_dp->orig_ndo_ops->ndo_do_ioctl)
- err = cpu_dp->orig_ndo_ops->ndo_do_ioctl(dev, ifr, cmd);
+ if (dev->netdev_ops->ndo_do_ioctl)
+ err = dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);

return err;
}

+static const struct dsa_netdevice_ops dsa_netdev_ops = {
+ .ndo_do_ioctl = dsa_master_ioctl,
+ .ndo_get_phys_port_name = dsa_master_get_phys_port_name,
+};
+
static int dsa_master_ethtool_setup(struct net_device *dev)
{
struct dsa_port *cpu_dp = dev->dsa_ptr;
@@ -260,38 +265,10 @@ static void dsa_master_ethtool_teardown(struct net_device *dev)
cpu_dp->orig_ethtool_ops = NULL;
}

-static int dsa_master_ndo_setup(struct net_device *dev)
-{
- struct dsa_port *cpu_dp = dev->dsa_ptr;
- struct dsa_switch *ds = cpu_dp->ds;
- struct net_device_ops *ops;
-
- if (dev->netdev_ops->ndo_get_phys_port_name)
- return 0;
-
- ops = devm_kzalloc(ds->dev, sizeof(*ops), GFP_KERNEL);
- if (!ops)
- return -ENOMEM;
-
- cpu_dp->orig_ndo_ops = dev->netdev_ops;
- if (cpu_dp->orig_ndo_ops)
- memcpy(ops, cpu_dp->orig_ndo_ops, sizeof(*ops));
-
- ops->ndo_get_phys_port_name = dsa_master_get_phys_port_name;
- ops->ndo_do_ioctl = dsa_master_ioctl;
-
- dev->netdev_ops = ops;
-
- return 0;
-}
-
-static void dsa_master_ndo_teardown(struct net_device *dev)
+static void dsa_netdev_ops_set(struct net_device *dev,
+ const struct dsa_netdevice_ops *ops)
{
- struct dsa_port *cpu_dp = dev->dsa_ptr;
-
- if (cpu_dp->orig_ndo_ops)
- dev->netdev_ops = cpu_dp->orig_ndo_ops;
- cpu_dp->orig_ndo_ops = NULL;
+ dev->dsa_ptr->netdev_ops = ops;
}

static ssize_t tagging_show(struct device *d, struct device_attribute *attr,
@@ -353,9 +330,7 @@ int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
if (ret)
return ret;

- ret = dsa_master_ndo_setup(dev);
- if (ret)
- goto out_err_ethtool_teardown;
+ dsa_netdev_ops_set(dev, &dsa_netdev_ops);

ret = sysfs_create_group(&dev->dev.kobj, &dsa_group);
if (ret)
@@ -364,8 +339,7 @@ int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
return ret;

out_err_ndo_teardown:
- dsa_master_ndo_teardown(dev);
-out_err_ethtool_teardown:
+ dsa_netdev_ops_set(dev, NULL);
dsa_master_ethtool_teardown(dev);
return ret;
}
@@ -373,7 +347,7 @@ int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
void dsa_master_teardown(struct net_device *dev)
{
sysfs_remove_group(&dev->dev.kobj, &dsa_group);
- dsa_master_ndo_teardown(dev);
+ dsa_netdev_ops_set(dev, NULL);
dsa_master_ethtool_teardown(dev);
dsa_master_reset_mtu(dev);

--
2.25.1
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