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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Distributed Switch Architecture loopback driver
4 *
5 * Copyright (C) 2016, Florian Fainelli <[email protected]>
6 */
7
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/if_vlan.h>
18#include <linux/types.h>
19#include <net/dsa.h>
20
21#define DSA_LOOP_NUM_PORTS 6
22#define DSA_LOOP_CPU_PORT (DSA_LOOP_NUM_PORTS - 1)
23#define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
24
25struct dsa_loop_vlan {
26 u16 members;
27 u16 untagged;
28};
29
30struct dsa_loop_mib_entry {
31 char name[ETH_GSTRING_LEN];
32 unsigned long val;
33};
34
35enum dsa_loop_mib_counters {
36 DSA_LOOP_PHY_READ_OK,
37 DSA_LOOP_PHY_READ_ERR,
38 DSA_LOOP_PHY_WRITE_OK,
39 DSA_LOOP_PHY_WRITE_ERR,
40 __DSA_LOOP_CNT_MAX,
41};
42
43struct dsa_loop_port {
44 struct dsa_loop_mib_entry mib[__DSA_LOOP_CNT_MAX];
45 u16 pvid;
46 int mtu;
47};
48
49struct dsa_loop_priv {
50 struct mii_bus *bus;
51 unsigned int port_base;
52 struct dsa_loop_vlan vlans[VLAN_N_VID];
53 struct net_device *netdev;
54 struct dsa_loop_port ports[DSA_MAX_PORTS];
55};
56
57struct dsa_loop_pdata {
58 /* Must be first, such that dsa_register_switch() can access this
59 * without gory pointer manipulations
60 */
61 struct dsa_chip_data cd;
62 const char *name;
63 unsigned int enabled_ports;
64 const char *netdev;
65};
66
67static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
68 [DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },
69 [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
70 [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
71 [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
72};
73
74static struct phy_device *phydevs[PHY_MAX_ADDR];
75static struct mdio_device *switch_mdiodev;
76
77enum dsa_loop_devlink_resource_id {
78 DSA_LOOP_DEVLINK_PARAM_ID_NONE, /* DEVLINK_RESOURCE_ID_PARENT_TOP */
79 DSA_LOOP_DEVLINK_PARAM_ID_VTU,
80};
81
82static u64 dsa_loop_devlink_vtu_get(void *priv)
83{
84 struct dsa_loop_priv *ps = priv;
85 unsigned int i, count = 0;
86 struct dsa_loop_vlan *vl;
87
88 for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {
89 vl = &ps->vlans[i];
90 if (vl->members)
91 count++;
92 }
93
94 return count;
95}
96
97static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)
98{
99 struct devlink_resource_size_params size_params;
100 struct dsa_loop_priv *ps = ds->priv;
101 int err;
102
103 devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),
104 ARRAY_SIZE(ps->vlans),
105 1, DEVLINK_RESOURCE_UNIT_ENTRY);
106
107 err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),
108 DSA_LOOP_DEVLINK_PARAM_ID_VTU,
109 DEVLINK_RESOURCE_ID_PARENT_TOP,
110 &size_params);
111 if (err)
112 goto out;
113
114 dsa_devlink_resource_occ_get_register(ds,
115 DSA_LOOP_DEVLINK_PARAM_ID_VTU,
116 dsa_loop_devlink_vtu_get, ps);
117
118 return 0;
119
120out:
121 dsa_devlink_resources_unregister(ds);
122 return err;
123}
124
125static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
126 int port,
127 enum dsa_tag_protocol mp)
128{
129 dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
130
131 return DSA_TAG_PROTO_NONE;
132}
133
134static int dsa_loop_setup(struct dsa_switch *ds)
135{
136 struct dsa_loop_priv *ps = ds->priv;
137 unsigned int i;
138
139 for (i = 0; i < ds->num_ports; i++)
140 memcpy(ps->ports[i].mib, dsa_loop_mibs,
141 sizeof(dsa_loop_mibs));
142
143 dev_dbg(ds->dev, "%s\n", __func__);
144
145 return dsa_loop_setup_devlink_resources(ds);
146}
147
148static void dsa_loop_teardown(struct dsa_switch *ds)
149{
150 dsa_devlink_resources_unregister(ds);
151}
152
153static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
154{
155 if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
156 return 0;
157
158 return __DSA_LOOP_CNT_MAX;
159}
160
161static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
162 u32 stringset, uint8_t *data)
163{
164 struct dsa_loop_priv *ps = ds->priv;
165 unsigned int i;
166
167 if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
168 return;
169
170 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
171 ethtool_puts(&data, ps->ports[port].mib[i].name);
172}
173
174static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
175 uint64_t *data)
176{
177 struct dsa_loop_priv *ps = ds->priv;
178 unsigned int i;
179
180 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
181 data[i] = ps->ports[port].mib[i].val;
182}
183
184static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
185{
186 struct dsa_loop_priv *ps = ds->priv;
187 struct mii_bus *bus = ps->bus;
188 int ret;
189
190 ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
191 if (ret < 0)
192 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
193 else
194 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
195
196 return ret;
197}
198
199static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
200 int regnum, u16 value)
201{
202 struct dsa_loop_priv *ps = ds->priv;
203 struct mii_bus *bus = ps->bus;
204 int ret;
205
206 ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
207 if (ret < 0)
208 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
209 else
210 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
211
212 return ret;
213}
214
215static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
216 struct dsa_bridge bridge,
217 bool *tx_fwd_offload,
218 struct netlink_ext_ack *extack)
219{
220 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
221 __func__, port, bridge.dev->name);
222
223 return 0;
224}
225
226static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
227 struct dsa_bridge bridge)
228{
229 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
230 __func__, port, bridge.dev->name);
231}
232
233static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
234 u8 state)
235{
236 dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
237 __func__, port, state);
238}
239
240static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
241 bool vlan_filtering,
242 struct netlink_ext_ack *extack)
243{
244 dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
245 __func__, port, vlan_filtering);
246
247 return 0;
248}
249
250static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
251 const struct switchdev_obj_port_vlan *vlan,
252 struct netlink_ext_ack *extack)
253{
254 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
255 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
256 struct dsa_loop_priv *ps = ds->priv;
257 struct mii_bus *bus = ps->bus;
258 struct dsa_loop_vlan *vl;
259
260 if (vlan->vid >= ARRAY_SIZE(ps->vlans))
261 return -ERANGE;
262
263 /* Just do a sleeping operation to make lockdep checks effective */
264 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
265
266 vl = &ps->vlans[vlan->vid];
267
268 vl->members |= BIT(port);
269 if (untagged)
270 vl->untagged |= BIT(port);
271 else
272 vl->untagged &= ~BIT(port);
273
274 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
275 __func__, port, vlan->vid, untagged ? "un" : "", pvid);
276
277 if (pvid)
278 ps->ports[port].pvid = vlan->vid;
279
280 return 0;
281}
282
283static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
284 const struct switchdev_obj_port_vlan *vlan)
285{
286 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
287 struct dsa_loop_priv *ps = ds->priv;
288 u16 pvid = ps->ports[port].pvid;
289 struct mii_bus *bus = ps->bus;
290 struct dsa_loop_vlan *vl;
291
292 /* Just do a sleeping operation to make lockdep checks effective */
293 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
294
295 vl = &ps->vlans[vlan->vid];
296
297 vl->members &= ~BIT(port);
298 if (untagged)
299 vl->untagged &= ~BIT(port);
300
301 if (pvid == vlan->vid)
302 pvid = 1;
303
304 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
305 __func__, port, vlan->vid, untagged ? "un" : "", pvid);
306 ps->ports[port].pvid = pvid;
307
308 return 0;
309}
310
311static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
312 int new_mtu)
313{
314 struct dsa_loop_priv *priv = ds->priv;
315
316 priv->ports[port].mtu = new_mtu;
317
318 return 0;
319}
320
321static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
322{
323 return ETH_MAX_MTU;
324}
325
326static void dsa_loop_phylink_get_caps(struct dsa_switch *dsa, int port,
327 struct phylink_config *config)
328{
329 bitmap_fill(config->supported_interfaces, PHY_INTERFACE_MODE_MAX);
330 __clear_bit(PHY_INTERFACE_MODE_NA, config->supported_interfaces);
331 config->mac_capabilities = ~0;
332}
333
334static const struct dsa_switch_ops dsa_loop_driver = {
335 .get_tag_protocol = dsa_loop_get_protocol,
336 .setup = dsa_loop_setup,
337 .teardown = dsa_loop_teardown,
338 .get_strings = dsa_loop_get_strings,
339 .get_ethtool_stats = dsa_loop_get_ethtool_stats,
340 .get_sset_count = dsa_loop_get_sset_count,
341 .get_ethtool_phy_stats = dsa_loop_get_ethtool_stats,
342 .phy_read = dsa_loop_phy_read,
343 .phy_write = dsa_loop_phy_write,
344 .port_bridge_join = dsa_loop_port_bridge_join,
345 .port_bridge_leave = dsa_loop_port_bridge_leave,
346 .port_stp_state_set = dsa_loop_port_stp_state_set,
347 .port_vlan_filtering = dsa_loop_port_vlan_filtering,
348 .port_vlan_add = dsa_loop_port_vlan_add,
349 .port_vlan_del = dsa_loop_port_vlan_del,
350 .port_change_mtu = dsa_loop_port_change_mtu,
351 .port_max_mtu = dsa_loop_port_max_mtu,
352 .phylink_get_caps = dsa_loop_phylink_get_caps,
353};
354
355static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
356{
357 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
358 struct dsa_loop_priv *ps;
359 struct dsa_switch *ds;
360 int ret;
361
362 if (!pdata)
363 return -ENODEV;
364
365 ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
366 if (!ds)
367 return -ENOMEM;
368
369 ds->dev = &mdiodev->dev;
370 ds->num_ports = DSA_LOOP_NUM_PORTS;
371
372 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
373 if (!ps)
374 return -ENOMEM;
375
376 ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
377 if (!ps->netdev)
378 return -EPROBE_DEFER;
379
380 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
381
382 ds->dev = &mdiodev->dev;
383 ds->ops = &dsa_loop_driver;
384 ds->priv = ps;
385 ps->bus = mdiodev->bus;
386
387 dev_set_drvdata(&mdiodev->dev, ds);
388
389 ret = dsa_register_switch(ds);
390 if (!ret)
391 dev_info(&mdiodev->dev, "%s: 0x%0x\n",
392 pdata->name, pdata->enabled_ports);
393
394 return ret;
395}
396
397static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
398{
399 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
400 struct dsa_loop_priv *ps;
401
402 if (!ds)
403 return;
404
405 ps = ds->priv;
406
407 dsa_unregister_switch(ds);
408 dev_put(ps->netdev);
409}
410
411static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)
412{
413 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
414
415 if (!ds)
416 return;
417
418 dsa_switch_shutdown(ds);
419
420 dev_set_drvdata(&mdiodev->dev, NULL);
421}
422
423static struct mdio_driver dsa_loop_drv = {
424 .mdiodrv.driver = {
425 .name = "dsa-loop",
426 },
427 .probe = dsa_loop_drv_probe,
428 .remove = dsa_loop_drv_remove,
429 .shutdown = dsa_loop_drv_shutdown,
430};
431
432static int dsa_loop_bus_match(struct device *dev,
433 const struct device_driver *drv)
434{
435 return drv == &dsa_loop_drv.mdiodrv.driver;
436}
437
438static void dsa_loop_phydevs_unregister(void)
439{
440 for (int i = 0; i < NUM_FIXED_PHYS; i++) {
441 if (!IS_ERR(phydevs[i]))
442 fixed_phy_unregister(phydevs[i]);
443 }
444}
445
446static int __init dsa_loop_create_switch_mdiodev(void)
447{
448 static struct dsa_loop_pdata dsa_loop_pdata = {
449 .cd = {
450 .port_names[0] = "lan1",
451 .port_names[1] = "lan2",
452 .port_names[2] = "lan3",
453 .port_names[3] = "lan4",
454 .port_names[DSA_LOOP_CPU_PORT] = "cpu",
455 },
456 .name = "DSA mockup driver",
457 .enabled_ports = 0x1f,
458 .netdev = "eth0",
459 };
460 struct mii_bus *bus;
461 int ret = -ENODEV;
462
463 bus = mdio_find_bus("fixed-0");
464 if (WARN_ON(!bus))
465 return ret;
466
467 switch_mdiodev = mdio_device_create(bus, 31);
468 if (IS_ERR(switch_mdiodev))
469 goto out;
470
471 switch_mdiodev->bus_match = dsa_loop_bus_match;
472 switch_mdiodev->dev.platform_data = &dsa_loop_pdata;
473
474 ret = mdio_device_register(switch_mdiodev);
475 if (ret)
476 mdio_device_free(switch_mdiodev);
477out:
478 put_device(&bus->dev);
479 return ret;
480}
481
482static int __init dsa_loop_init(void)
483{
484 unsigned int i;
485 int ret;
486
487 ret = dsa_loop_create_switch_mdiodev();
488 if (ret)
489 return ret;
490
491 for (i = 0; i < NUM_FIXED_PHYS; i++)
492 phydevs[i] = fixed_phy_register_100fd();
493
494 ret = mdio_driver_register(&dsa_loop_drv);
495 if (ret) {
496 dsa_loop_phydevs_unregister();
497 mdio_device_remove(switch_mdiodev);
498 mdio_device_free(switch_mdiodev);
499 }
500
501 return ret;
502}
503module_init(dsa_loop_init);
504
505static void __exit dsa_loop_exit(void)
506{
507 mdio_driver_unregister(&dsa_loop_drv);
508 dsa_loop_phydevs_unregister();
509 mdio_device_remove(switch_mdiodev);
510 mdio_device_free(switch_mdiodev);
511}
512module_exit(dsa_loop_exit);
513
514MODULE_LICENSE("GPL");
515MODULE_AUTHOR("Florian Fainelli");
516MODULE_DESCRIPTION("DSA loopback driver");