1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Distributed Switch Architecture loopback driver
5 * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
8 #include <linux/platform_device.h>
9 #include <linux/netdevice.h>
10 #include <linux/phy.h>
11 #include <linux/phy_fixed.h>
12 #include <linux/export.h>
13 #include <linux/ethtool.h>
14 #include <linux/workqueue.h>
15 #include <linux/module.h>
16 #include <linux/if_bridge.h>
17 #include <linux/dsa/loop.h>
22 static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
23 [DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },
24 [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
25 [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
26 [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
29 static struct phy_device *phydevs[PHY_MAX_ADDR];
31 enum dsa_loop_devlink_resource_id {
32 DSA_LOOP_DEVLINK_PARAM_ID_VTU,
35 static u64 dsa_loop_devlink_vtu_get(void *priv)
37 struct dsa_loop_priv *ps = priv;
38 unsigned int i, count = 0;
39 struct dsa_loop_vlan *vl;
41 for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {
50 static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)
52 struct devlink_resource_size_params size_params;
53 struct dsa_loop_priv *ps = ds->priv;
56 devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),
57 ARRAY_SIZE(ps->vlans),
58 1, DEVLINK_RESOURCE_UNIT_ENTRY);
60 err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),
61 DSA_LOOP_DEVLINK_PARAM_ID_VTU,
62 DEVLINK_RESOURCE_ID_PARENT_TOP,
67 dsa_devlink_resource_occ_get_register(ds,
68 DSA_LOOP_DEVLINK_PARAM_ID_VTU,
69 dsa_loop_devlink_vtu_get, ps);
74 dsa_devlink_resources_unregister(ds);
78 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
80 enum dsa_tag_protocol mp)
82 dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
84 return DSA_TAG_PROTO_NONE;
87 static int dsa_loop_setup(struct dsa_switch *ds)
89 struct dsa_loop_priv *ps = ds->priv;
92 for (i = 0; i < ds->num_ports; i++)
93 memcpy(ps->ports[i].mib, dsa_loop_mibs,
94 sizeof(dsa_loop_mibs));
96 dev_dbg(ds->dev, "%s\n", __func__);
98 return dsa_loop_setup_devlink_resources(ds);
101 static void dsa_loop_teardown(struct dsa_switch *ds)
103 dsa_devlink_resources_unregister(ds);
106 static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
108 if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
111 return __DSA_LOOP_CNT_MAX;
114 static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
115 u32 stringset, uint8_t *data)
117 struct dsa_loop_priv *ps = ds->priv;
120 if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
123 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
124 memcpy(data + i * ETH_GSTRING_LEN,
125 ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
128 static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
131 struct dsa_loop_priv *ps = ds->priv;
134 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
135 data[i] = ps->ports[port].mib[i].val;
138 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
140 struct dsa_loop_priv *ps = ds->priv;
141 struct mii_bus *bus = ps->bus;
144 ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
146 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
148 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
153 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
154 int regnum, u16 value)
156 struct dsa_loop_priv *ps = ds->priv;
157 struct mii_bus *bus = ps->bus;
160 ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
162 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
164 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
169 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
170 struct net_device *bridge)
172 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
173 __func__, port, bridge->name);
178 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
179 struct net_device *bridge)
181 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
182 __func__, port, bridge->name);
185 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
188 dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
189 __func__, port, state);
192 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
195 dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
196 __func__, port, vlan_filtering);
201 static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
202 const struct switchdev_obj_port_vlan *vlan)
204 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
205 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
206 struct dsa_loop_priv *ps = ds->priv;
207 struct mii_bus *bus = ps->bus;
208 struct dsa_loop_vlan *vl;
210 if (vlan->vid >= ARRAY_SIZE(ps->vlans))
213 /* Just do a sleeping operation to make lockdep checks effective */
214 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
216 vl = &ps->vlans[vlan->vid];
218 vl->members |= BIT(port);
220 vl->untagged |= BIT(port);
222 vl->untagged &= ~BIT(port);
224 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
225 __func__, port, vlan->vid, untagged ? "un" : "", pvid);
228 ps->ports[port].pvid = vlan->vid;
233 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
234 const struct switchdev_obj_port_vlan *vlan)
236 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
237 struct dsa_loop_priv *ps = ds->priv;
238 u16 pvid = ps->ports[port].pvid;
239 struct mii_bus *bus = ps->bus;
240 struct dsa_loop_vlan *vl;
242 /* Just do a sleeping operation to make lockdep checks effective */
243 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
245 vl = &ps->vlans[vlan->vid];
247 vl->members &= ~BIT(port);
249 vl->untagged &= ~BIT(port);
251 if (pvid == vlan->vid)
254 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
255 __func__, port, vlan->vid, untagged ? "un" : "", pvid);
256 ps->ports[port].pvid = pvid;
261 static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
264 struct dsa_loop_priv *priv = ds->priv;
266 priv->ports[port].mtu = new_mtu;
271 static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
276 static const struct dsa_switch_ops dsa_loop_driver = {
277 .get_tag_protocol = dsa_loop_get_protocol,
278 .setup = dsa_loop_setup,
279 .teardown = dsa_loop_teardown,
280 .get_strings = dsa_loop_get_strings,
281 .get_ethtool_stats = dsa_loop_get_ethtool_stats,
282 .get_sset_count = dsa_loop_get_sset_count,
283 .get_ethtool_phy_stats = dsa_loop_get_ethtool_stats,
284 .phy_read = dsa_loop_phy_read,
285 .phy_write = dsa_loop_phy_write,
286 .port_bridge_join = dsa_loop_port_bridge_join,
287 .port_bridge_leave = dsa_loop_port_bridge_leave,
288 .port_stp_state_set = dsa_loop_port_stp_state_set,
289 .port_vlan_filtering = dsa_loop_port_vlan_filtering,
290 .port_vlan_add = dsa_loop_port_vlan_add,
291 .port_vlan_del = dsa_loop_port_vlan_del,
292 .port_change_mtu = dsa_loop_port_change_mtu,
293 .port_max_mtu = dsa_loop_port_max_mtu,
296 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
298 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
299 struct dsa_loop_priv *ps;
300 struct dsa_switch *ds;
306 ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
310 ds->dev = &mdiodev->dev;
311 ds->num_ports = DSA_LOOP_NUM_PORTS;
313 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
317 ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
319 return -EPROBE_DEFER;
321 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
323 ds->dev = &mdiodev->dev;
324 ds->ops = &dsa_loop_driver;
326 ps->bus = mdiodev->bus;
328 dev_set_drvdata(&mdiodev->dev, ds);
330 ret = dsa_register_switch(ds);
332 dev_info(&mdiodev->dev, "%s: 0x%0x\n",
333 pdata->name, pdata->enabled_ports);
338 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
340 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
341 struct dsa_loop_priv *ps = ds->priv;
343 dsa_unregister_switch(ds);
347 static struct mdio_driver dsa_loop_drv = {
351 .probe = dsa_loop_drv_probe,
352 .remove = dsa_loop_drv_remove,
355 #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
357 static int __init dsa_loop_init(void)
359 struct fixed_phy_status status = {
362 .duplex = DUPLEX_FULL,
366 for (i = 0; i < NUM_FIXED_PHYS; i++)
367 phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
369 return mdio_driver_register(&dsa_loop_drv);
371 module_init(dsa_loop_init);
373 static void __exit dsa_loop_exit(void)
377 mdio_driver_unregister(&dsa_loop_drv);
378 for (i = 0; i < NUM_FIXED_PHYS; i++)
379 if (!IS_ERR(phydevs[i]))
380 fixed_phy_unregister(phydevs[i]);
382 module_exit(dsa_loop_exit);
384 MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
385 MODULE_LICENSE("GPL");
386 MODULE_AUTHOR("Florian Fainelli");
387 MODULE_DESCRIPTION("DSA loopback driver");