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net: dsa: Add ndo_get_phys_port_name() for CPU port 

There is not currently way to infer the port number through sysfs that
is being used as the CPU port number. Overlay a ndo_get_phys_port_name()
operation onto the DSA master network device in order to retrieve that
information.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2019-01-15 14:43:04 -08:00 committed by David S. Miller
parent 44543f1dd2
commit da7b9e9b00
2 changed files with 60 additions and 1 deletions
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5
include/net/dsa.h
View File

@ -208,6 +208,11 @@ struct dsa_port {
* Original copy of the master netdev ethtool_ops
*/
const struct ethtool_ops *orig_ethtool_ops;
/*
* Original copy of the master netdev net_device_ops
*/
const struct net_device_ops *orig_ndo_ops;
};
struct dsa_switch {

56
net/dsa/master.c
View File

@ -126,6 +126,17 @@ static void dsa_master_get_strings(struct net_device *dev, uint32_t stringset,
}
}
static int dsa_master_get_phys_port_name(struct net_device *dev,
char *name, size_t len)
{
struct dsa_port *cpu_dp = dev->dsa_ptr;
if (snprintf(name, len, "p%d", cpu_dp->index) >= len)
return -EINVAL;
return 0;
}
static int dsa_master_ethtool_setup(struct net_device *dev)
{
struct dsa_port *cpu_dp = dev->dsa_ptr;
@ -158,6 +169,38 @@ 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;
dev->netdev_ops = ops;
return 0;
}
static void dsa_master_ndo_teardown(struct net_device *dev)
{
struct dsa_port *cpu_dp = dev->dsa_ptr;
dev->netdev_ops = cpu_dp->orig_ndo_ops;
cpu_dp->orig_ndo_ops = NULL;
}
static ssize_t tagging_show(struct device *d, struct device_attribute *attr,
char *buf)
{
@ -223,16 +266,27 @@ 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;
ret = sysfs_create_group(&dev->dev.kobj, &dsa_group);
if (ret)
dsa_master_ethtool_teardown(dev);
goto out_err_ndo_teardown;
return ret;
out_err_ndo_teardown:
dsa_master_ndo_teardown(dev);
out_err_ethtool_teardown:
dsa_master_ethtool_teardown(dev);
return ret;
}
void dsa_master_teardown(struct net_device *dev)
{
sysfs_remove_group(&dev->dev.kobj, &dsa_group);
dsa_master_ndo_teardown(dev);
dsa_master_ethtool_teardown(dev);
dsa_master_reset_mtu(dev);