2 * Distributed Switch Architecture loopback driver
4 * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
12 #include <linux/platform_device.h>
13 #include <linux/netdevice.h>
14 #include <linux/phy.h>
15 #include <linux/phy_fixed.h>
16 #include <linux/export.h>
17 #include <linux/ethtool.h>
18 #include <linux/workqueue.h>
19 #include <linux/module.h>
20 #include <linux/if_bridge.h>
25 struct dsa_loop_vlan {
30 struct dsa_loop_mib_entry {
31 char name[ETH_GSTRING_LEN];
35 enum dsa_loop_mib_counters {
37 DSA_LOOP_PHY_READ_ERR,
38 DSA_LOOP_PHY_WRITE_OK,
39 DSA_LOOP_PHY_WRITE_ERR,
43 static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
44 [DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },
45 [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
46 [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
47 [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
50 struct dsa_loop_port {
51 struct dsa_loop_mib_entry mib[__DSA_LOOP_CNT_MAX];
54 #define DSA_LOOP_VLANS 5
56 struct dsa_loop_priv {
58 unsigned int port_base;
59 struct dsa_loop_vlan vlans[DSA_LOOP_VLANS];
60 struct net_device *netdev;
61 struct dsa_loop_port ports[DSA_MAX_PORTS];
65 static struct phy_device *phydevs[PHY_MAX_ADDR];
67 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds)
69 dev_dbg(ds->dev, "%s\n", __func__);
71 return DSA_TAG_PROTO_NONE;
74 static int dsa_loop_setup(struct dsa_switch *ds)
76 struct dsa_loop_priv *ps = ds->priv;
79 for (i = 0; i < ds->num_ports; i++)
80 memcpy(ps->ports[i].mib, dsa_loop_mibs,
81 sizeof(dsa_loop_mibs));
83 dev_dbg(ds->dev, "%s\n", __func__);
88 static int dsa_loop_get_sset_count(struct dsa_switch *ds)
90 return __DSA_LOOP_CNT_MAX;
93 static void dsa_loop_get_strings(struct dsa_switch *ds, int port, uint8_t *data)
95 struct dsa_loop_priv *ps = ds->priv;
98 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
99 memcpy(data + i * ETH_GSTRING_LEN,
100 ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
103 static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
106 struct dsa_loop_priv *ps = ds->priv;
109 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
110 data[i] = ps->ports[port].mib[i].val;
113 static int dsa_loop_set_addr(struct dsa_switch *ds, u8 *addr)
115 dev_dbg(ds->dev, "%s\n", __func__);
120 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
122 struct dsa_loop_priv *ps = ds->priv;
123 struct mii_bus *bus = ps->bus;
126 dev_dbg(ds->dev, "%s\n", __func__);
128 ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
130 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
132 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
137 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
138 int regnum, u16 value)
140 struct dsa_loop_priv *ps = ds->priv;
141 struct mii_bus *bus = ps->bus;
144 dev_dbg(ds->dev, "%s\n", __func__);
146 ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
148 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
150 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
155 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
156 struct net_device *bridge)
158 dev_dbg(ds->dev, "%s\n", __func__);
163 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
164 struct net_device *bridge)
166 dev_dbg(ds->dev, "%s\n", __func__);
169 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
172 dev_dbg(ds->dev, "%s\n", __func__);
175 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
178 dev_dbg(ds->dev, "%s\n", __func__);
183 static int dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
184 const struct switchdev_obj_port_vlan *vlan,
185 struct switchdev_trans *trans)
187 struct dsa_loop_priv *ps = ds->priv;
188 struct mii_bus *bus = ps->bus;
190 dev_dbg(ds->dev, "%s\n", __func__);
192 /* Just do a sleeping operation to make lockdep checks effective */
193 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
195 if (vlan->vid_end > DSA_LOOP_VLANS)
201 static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
202 const struct switchdev_obj_port_vlan *vlan,
203 struct switchdev_trans *trans)
205 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
206 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
207 struct dsa_loop_priv *ps = ds->priv;
208 struct mii_bus *bus = ps->bus;
209 struct dsa_loop_vlan *vl;
212 dev_dbg(ds->dev, "%s\n", __func__);
214 /* Just do a sleeping operation to make lockdep checks effective */
215 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
217 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
218 vl = &ps->vlans[vid];
220 vl->members |= BIT(port);
222 vl->untagged |= BIT(port);
224 vl->untagged &= ~BIT(port);
231 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
232 const struct switchdev_obj_port_vlan *vlan)
234 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
235 struct dsa_loop_priv *ps = ds->priv;
236 struct mii_bus *bus = ps->bus;
237 struct dsa_loop_vlan *vl;
238 u16 vid, pvid = ps->pvid;
240 dev_dbg(ds->dev, "%s\n", __func__);
242 /* Just do a sleeping operation to make lockdep checks effective */
243 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
245 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
246 vl = &ps->vlans[vid];
248 vl->members &= ~BIT(port);
250 vl->untagged &= ~BIT(port);
260 static int dsa_loop_port_vlan_dump(struct dsa_switch *ds, int port,
261 struct switchdev_obj_port_vlan *vlan,
262 switchdev_obj_dump_cb_t *cb)
264 struct dsa_loop_priv *ps = ds->priv;
265 struct mii_bus *bus = ps->bus;
266 struct dsa_loop_vlan *vl;
267 u16 vid, vid_start = 0;
270 dev_dbg(ds->dev, "%s\n", __func__);
272 /* Just do a sleeping operation to make lockdep checks effective */
273 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
275 for (vid = vid_start; vid < DSA_LOOP_VLANS; vid++) {
276 vl = &ps->vlans[vid];
278 if (!(vl->members & BIT(port)))
281 vlan->vid_begin = vlan->vid_end = vid;
284 if (vl->untagged & BIT(port))
285 vlan->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
287 vlan->flags |= BRIDGE_VLAN_INFO_PVID;
289 err = cb(&vlan->obj);
297 static struct dsa_switch_ops dsa_loop_driver = {
298 .get_tag_protocol = dsa_loop_get_protocol,
299 .setup = dsa_loop_setup,
300 .get_strings = dsa_loop_get_strings,
301 .get_ethtool_stats = dsa_loop_get_ethtool_stats,
302 .get_sset_count = dsa_loop_get_sset_count,
303 .set_addr = dsa_loop_set_addr,
304 .phy_read = dsa_loop_phy_read,
305 .phy_write = dsa_loop_phy_write,
306 .port_bridge_join = dsa_loop_port_bridge_join,
307 .port_bridge_leave = dsa_loop_port_bridge_leave,
308 .port_stp_state_set = dsa_loop_port_stp_state_set,
309 .port_vlan_filtering = dsa_loop_port_vlan_filtering,
310 .port_vlan_prepare = dsa_loop_port_vlan_prepare,
311 .port_vlan_add = dsa_loop_port_vlan_add,
312 .port_vlan_del = dsa_loop_port_vlan_del,
313 .port_vlan_dump = dsa_loop_port_vlan_dump,
316 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
318 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
319 struct dsa_loop_priv *ps;
320 struct dsa_switch *ds;
325 dev_info(&mdiodev->dev, "%s: 0x%0x\n",
326 pdata->name, pdata->enabled_ports);
328 ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
332 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
336 ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
338 return -EPROBE_DEFER;
340 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
342 ds->dev = &mdiodev->dev;
343 ds->ops = &dsa_loop_driver;
345 ps->bus = mdiodev->bus;
347 dev_set_drvdata(&mdiodev->dev, ds);
349 return dsa_register_switch(ds);
352 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
354 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
355 struct dsa_loop_priv *ps = ds->priv;
357 dsa_unregister_switch(ds);
361 static struct mdio_driver dsa_loop_drv = {
365 .probe = dsa_loop_drv_probe,
366 .remove = dsa_loop_drv_remove,
369 #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
371 static int __init dsa_loop_init(void)
373 struct fixed_phy_status status = {
376 .duplex = DUPLEX_FULL,
380 for (i = 0; i < NUM_FIXED_PHYS; i++)
381 phydevs[i] = fixed_phy_register(PHY_POLL, &status, -1, NULL);
383 return mdio_driver_register(&dsa_loop_drv);
385 module_init(dsa_loop_init);
387 static void __exit dsa_loop_exit(void)
391 mdio_driver_unregister(&dsa_loop_drv);
392 for (i = 0; i < NUM_FIXED_PHYS; i++)
394 fixed_phy_unregister(phydevs[i]);
396 module_exit(dsa_loop_exit);
398 MODULE_LICENSE("GPL");
399 MODULE_AUTHOR("Florian Fainelli");
400 MODULE_DESCRIPTION("DSA loopback driver");