#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/export.h>
#include <linux/ethtool.h>
#include <linux/workqueue.h>
#include <linux/module.h>
#include <linux/if_bridge.h>
#include <linux/dsa/loop.h>
#include <net/dsa.h>
#define DSA_LOOP_NUM_PORTS 6
#define DSA_LOOP_CPU_PORT (DSA_LOOP_NUM_PORTS - 1)
#define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
struct dsa_loop_pdata {
struct dsa_chip_data cd;
const char *name;
unsigned int enabled_ports;
const char *netdev;
};
static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
[DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },
[DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
[DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
[DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
};
static struct phy_device *phydevs[PHY_MAX_ADDR];
static struct mdio_device *switch_mdiodev;
enum dsa_loop_devlink_resource_id {
DSA_LOOP_DEVLINK_PARAM_ID_VTU,
};
static u64 dsa_loop_devlink_vtu_get(void *priv)
{
struct dsa_loop_priv *ps = priv;
unsigned int i, count = 0;
struct dsa_loop_vlan *vl;
for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {
vl = &ps->vlans[i];
if (vl->members)
count++;
}
return count;
}
static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)
{
struct devlink_resource_size_params size_params;
struct dsa_loop_priv *ps = ds->priv;
int err;
devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),
ARRAY_SIZE(ps->vlans),
1, DEVLINK_RESOURCE_UNIT_ENTRY);
err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),
DSA_LOOP_DEVLINK_PARAM_ID_VTU,
DEVLINK_RESOURCE_ID_PARENT_TOP,
&size_params);
if (err)
goto out;
dsa_devlink_resource_occ_get_register(ds,
DSA_LOOP_DEVLINK_PARAM_ID_VTU,
dsa_loop_devlink_vtu_get, ps);
return 0;
out:
dsa_devlink_resources_unregister(ds);
return err;
}
static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
int port,
enum dsa_tag_protocol mp)
{
dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
return DSA_TAG_PROTO_NONE;
}
static int dsa_loop_setup(struct dsa_switch *ds)
{
struct dsa_loop_priv *ps = ds->priv;
unsigned int i;
for (i = 0; i < ds->num_ports; i++)
memcpy(ps->ports[i].mib, dsa_loop_mibs,
sizeof(dsa_loop_mibs));
dev_dbg(ds->dev, "%s\n", __func__);
return dsa_loop_setup_devlink_resources(ds);
}
static void dsa_loop_teardown(struct dsa_switch *ds)
{
dsa_devlink_resources_unregister(ds);
}
static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
{
if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
return 0;
return __DSA_LOOP_CNT_MAX;
}
static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
u32 stringset, uint8_t *data)
{
struct dsa_loop_priv *ps = ds->priv;
unsigned int i;
if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
return;
for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
ethtool_puts(&data, ps->ports[port].mib[i].name);
}
static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
uint64_t *data)
{
struct dsa_loop_priv *ps = ds->priv;
unsigned int i;
for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
data[i] = ps->ports[port].mib[i].val;
}
static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
{
struct dsa_loop_priv *ps = ds->priv;
struct mii_bus *bus = ps->bus;
int ret;
ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
if (ret < 0)
ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
else
ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
return ret;
}
static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
int regnum, u16 value)
{
struct dsa_loop_priv *ps = ds->priv;
struct mii_bus *bus = ps->bus;
int ret;
ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
if (ret < 0)
ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
else
ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
return ret;
}
static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
struct dsa_bridge bridge,
bool *tx_fwd_offload,
struct netlink_ext_ack *extack)
{
dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
__func__, port, bridge.dev->name);
return 0;
}
static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
struct dsa_bridge bridge)
{
dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
__func__, port, bridge.dev->name);
}
static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
u8 state)
{
dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
__func__, port, state);
}
static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
bool vlan_filtering,
struct netlink_ext_ack *extack)
{
dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
__func__, port, vlan_filtering);
return 0;
}
static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_vlan *vlan,
struct netlink_ext_ack *extack)
{
bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
struct dsa_loop_priv *ps = ds->priv;
struct mii_bus *bus = ps->bus;
struct dsa_loop_vlan *vl;
if (vlan->vid >= ARRAY_SIZE(ps->vlans))
return -ERANGE;
mdiobus_read(bus, ps->port_base + port, MII_BMSR);
vl = &ps->vlans[vlan->vid];
vl->members |= BIT(port);
if (untagged)
vl->untagged |= BIT(port);
else
vl->untagged &= ~BIT(port);
dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
__func__, port, vlan->vid, untagged ? "un" : "", pvid);
if (pvid)
ps->ports[port].pvid = vlan->vid;
return 0;
}
static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_vlan *vlan)
{
bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
struct dsa_loop_priv *ps = ds->priv;
u16 pvid = ps->ports[port].pvid;
struct mii_bus *bus = ps->bus;
struct dsa_loop_vlan *vl;
mdiobus_read(bus, ps->port_base + port, MII_BMSR);
vl = &ps->vlans[vlan->vid];
vl->members &= ~BIT(port);
if (untagged)
vl->untagged &= ~BIT(port);
if (pvid == vlan->vid)
pvid = 1;
dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
__func__, port, vlan->vid, untagged ? "un" : "", pvid);
ps->ports[port].pvid = pvid;
return 0;
}
static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
int new_mtu)
{
struct dsa_loop_priv *priv = ds->priv;
priv->ports[port].mtu = new_mtu;
return 0;
}
static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
{
return ETH_MAX_MTU;
}
static void dsa_loop_phylink_get_caps(struct dsa_switch *dsa, int port,
struct phylink_config *config)
{
bitmap_fill(config->supported_interfaces, PHY_INTERFACE_MODE_MAX);
__clear_bit(PHY_INTERFACE_MODE_NA, config->supported_interfaces);
config->mac_capabilities = ~0;
}
static const struct dsa_switch_ops dsa_loop_driver = {
.get_tag_protocol = dsa_loop_get_protocol,
.setup = dsa_loop_setup,
.teardown = dsa_loop_teardown,
.get_strings = dsa_loop_get_strings,
.get_ethtool_stats = dsa_loop_get_ethtool_stats,
.get_sset_count = dsa_loop_get_sset_count,
.get_ethtool_phy_stats = dsa_loop_get_ethtool_stats,
.phy_read = dsa_loop_phy_read,
.phy_write = dsa_loop_phy_write,
.port_bridge_join = dsa_loop_port_bridge_join,
.port_bridge_leave = dsa_loop_port_bridge_leave,
.port_stp_state_set = dsa_loop_port_stp_state_set,
.port_vlan_filtering = dsa_loop_port_vlan_filtering,
.port_vlan_add = dsa_loop_port_vlan_add,
.port_vlan_del = dsa_loop_port_vlan_del,
.port_change_mtu = dsa_loop_port_change_mtu,
.port_max_mtu = dsa_loop_port_max_mtu,
.phylink_get_caps = dsa_loop_phylink_get_caps,
};
static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
{
struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
struct dsa_loop_priv *ps;
struct dsa_switch *ds;
int ret;
if (!pdata)
return -ENODEV;
ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
if (!ds)
return -ENOMEM;
ds->dev = &mdiodev->dev;
ds->num_ports = DSA_LOOP_NUM_PORTS;
ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
if (!ps)
return -ENOMEM;
ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
if (!ps->netdev)
return -EPROBE_DEFER;
pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
ds->dev = &mdiodev->dev;
ds->ops = &dsa_loop_driver;
ds->priv = ps;
ps->bus = mdiodev->bus;
dev_set_drvdata(&mdiodev->dev, ds);
ret = dsa_register_switch(ds);
if (!ret)
dev_info(&mdiodev->dev, "%s: 0x%0x\n",
pdata->name, pdata->enabled_ports);
return ret;
}
static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
{
struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
struct dsa_loop_priv *ps;
if (!ds)
return;
ps = ds->priv;
dsa_unregister_switch(ds);
dev_put(ps->netdev);
}
static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)
{
struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
if (!ds)
return;
dsa_switch_shutdown(ds);
dev_set_drvdata(&mdiodev->dev, NULL);
}
static struct mdio_driver dsa_loop_drv = {
.mdiodrv.driver = {
.name = "dsa-loop",
},
.probe = dsa_loop_drv_probe,
.remove = dsa_loop_drv_remove,
.shutdown = dsa_loop_drv_shutdown,
};
static int dsa_loop_bus_match(struct device *dev,
const struct device_driver *drv)
{
return drv == &dsa_loop_drv.mdiodrv.driver;
}
static void dsa_loop_phydevs_unregister(void)
{
for (int i = 0; i < NUM_FIXED_PHYS; i++) {
if (!IS_ERR(phydevs[i]))
fixed_phy_unregister(phydevs[i]);
}
}
static int __init dsa_loop_create_switch_mdiodev(void)
{
static struct dsa_loop_pdata dsa_loop_pdata = {
.cd = {
.port_names[0] = "lan1",
.port_names[1] = "lan2",
.port_names[2] = "lan3",
.port_names[3] = "lan4",
.port_names[DSA_LOOP_CPU_PORT] = "cpu",
},
.name = "DSA mockup driver",
.enabled_ports = 0x1f,
.netdev = "eth0",
};
struct mii_bus *bus;
int ret = -ENODEV;
bus = mdio_find_bus("fixed-0");
if (WARN_ON(!bus))
return ret;
switch_mdiodev = mdio_device_create(bus, 31);
if (IS_ERR(switch_mdiodev))
goto out;
switch_mdiodev->bus_match = dsa_loop_bus_match;
switch_mdiodev->dev.platform_data = &dsa_loop_pdata;
ret = mdio_device_register(switch_mdiodev);
if (ret)
mdio_device_free(switch_mdiodev);
out:
put_device(&bus->dev);
return ret;
}
static int __init dsa_loop_init(void)
{
unsigned int i;
int ret;
ret = dsa_loop_create_switch_mdiodev();
if (ret)
return ret;
for (i = 0; i < NUM_FIXED_PHYS; i++)
phydevs[i] = fixed_phy_register_100fd();
ret = mdio_driver_register(&dsa_loop_drv);
if (ret) {
dsa_loop_phydevs_unregister();
mdio_device_remove(switch_mdiodev);
mdio_device_free(switch_mdiodev);
}
return ret;
}
module_init(dsa_loop_init);
static void __exit dsa_loop_exit(void)
{
mdio_driver_unregister(&dsa_loop_drv);
dsa_loop_phydevs_unregister();
mdio_device_remove(switch_mdiodev);
mdio_device_free(switch_mdiodev);
}
module_exit(dsa_loop_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Fainelli");
MODULE_DESCRIPTION("DSA loopback driver");
