summaryrefslogtreecommitdiffstats
path: root/drivers/net/dsa/dsa_loop.c
blob: e638e3eea9112d504a28173ad3527d67ff2e3aa8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Distributed Switch Architecture loopback driver
 *
 * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
 */

#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>

#include "dsa_loop.h"

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];

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++)
		memcpy(data + i * ETH_GSTRING_LEN,
		       ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
}

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 net_device *bridge)
{
	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
		__func__, port, bridge->name);

	return 0;
}

static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
				       struct net_device *bridge)
{
	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
		__func__, port, bridge->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;

	/* Just do a sleeping operation to make lockdep checks effective */
	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;

	/* Just do a sleeping operation to make lockdep checks effective */
	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 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,
};

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);

	dev_set_drvdata(&mdiodev->dev, NULL);
}

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,
};

#define NUM_FIXED_PHYS	(DSA_LOOP_NUM_PORTS - 2)

static int __init dsa_loop_init(void)
{
	struct fixed_phy_status status = {
		.link = 1,
		.speed = SPEED_100,
		.duplex = DUPLEX_FULL,
	};
	unsigned int i;

	for (i = 0; i < NUM_FIXED_PHYS; i++)
		phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);

	return mdio_driver_register(&dsa_loop_drv);
}
module_init(dsa_loop_init);

static void __exit dsa_loop_exit(void)
{
	unsigned int i;

	mdio_driver_unregister(&dsa_loop_drv);
	for (i = 0; i < NUM_FIXED_PHYS; i++)
		if (!IS_ERR(phydevs[i]))
			fixed_phy_unregister(phydevs[i]);
}
module_exit(dsa_loop_exit);

MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Fainelli");
MODULE_DESCRIPTION("DSA loopback driver");