aboutsummaryrefslogtreecommitdiff
path: root/net/dsa/master.c
blob: c91de041a91d83a03e58b502f45febdd6dc69f93 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Handling of a master device, switching frames via its switch fabric CPU port
 *
 * Copyright (c) 2017 Savoir-faire Linux Inc.
 *	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
 */

#include "dsa_priv.h"

static int dsa_master_get_regs_len(struct net_device *dev)
{
	struct dsa_port *cpu_dp = dev->dsa_ptr;
	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
	struct dsa_switch *ds = cpu_dp->ds;
	int port = cpu_dp->index;
	int ret = 0;
	int len;

	if (ops->get_regs_len) {
		len = ops->get_regs_len(dev);
		if (len < 0)
			return len;
		ret += len;
	}

	ret += sizeof(struct ethtool_drvinfo);
	ret += sizeof(struct ethtool_regs);

	if (ds->ops->get_regs_len) {
		len = ds->ops->get_regs_len(ds, port);
		if (len < 0)
			return len;
		ret += len;
	}

	return ret;
}

static void dsa_master_get_regs(struct net_device *dev,
				struct ethtool_regs *regs, void *data)
{
	struct dsa_port *cpu_dp = dev->dsa_ptr;
	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
	struct dsa_switch *ds = cpu_dp->ds;
	struct ethtool_drvinfo *cpu_info;
	struct ethtool_regs *cpu_regs;
	int port = cpu_dp->index;
	int len;

	if (ops->get_regs_len && ops->get_regs) {
		len = ops->get_regs_len(dev);
		if (len < 0)
			return;
		regs->len = len;
		ops->get_regs(dev, regs, data);
		data += regs->len;
	}

	cpu_info = (struct ethtool_drvinfo *)data;
	strlcpy(cpu_info->driver, "dsa", sizeof(cpu_info->driver));
	data += sizeof(*cpu_info);
	cpu_regs = (struct ethtool_regs *)data;
	data += sizeof(*cpu_regs);

	if (ds->ops->get_regs_len && ds->ops->get_regs) {
		len = ds->ops->get_regs_len(ds, port);
		if (len < 0)
			return;
		cpu_regs->len = len;
		ds->ops->get_regs(ds, port, cpu_regs, data);
	}
}

static void dsa_master_get_ethtool_stats(struct net_device *dev,
					 struct ethtool_stats *stats,
					 uint64_t *data)
{
	struct dsa_port *cpu_dp = dev->dsa_ptr;
	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
	struct dsa_switch *ds = cpu_dp->ds;
	int port = cpu_dp->index;
	int count = 0;

	if (ops->get_sset_count && ops->get_ethtool_stats) {
		count = ops->get_sset_count(dev, ETH_SS_STATS);
		ops->get_ethtool_stats(dev, stats, data);
	}

	if (ds->ops->get_ethtool_stats)
		ds->ops->get_ethtool_stats(ds, port, data + count);
}

static void dsa_master_get_ethtool_phy_stats(struct net_device *dev,
					     struct ethtool_stats *stats,
					     uint64_t *data)
{
	struct dsa_port *cpu_dp = dev->dsa_ptr;
	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
	struct dsa_switch *ds = cpu_dp->ds;
	int port = cpu_dp->index;
	int count = 0;

	if (dev->phydev && !ops->get_ethtool_phy_stats) {
		count = phy_ethtool_get_sset_count(dev->phydev);
		if (count >= 0)
			phy_ethtool_get_stats(dev->phydev, stats, data);
	} else if (ops->get_sset_count && ops->get_ethtool_phy_stats) {
		count = ops->get_sset_count(dev, ETH_SS_PHY_STATS);
		ops->get_ethtool_phy_stats(dev, stats, data);
	}

	if (count < 0)
		count = 0;

	if (ds->ops->get_ethtool_phy_stats)
		ds->ops->get_ethtool_phy_stats(ds, port, data + count);
}

static int dsa_master_get_sset_count(struct net_device *dev, int sset)
{
	struct dsa_port *cpu_dp = dev->dsa_ptr;
	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
	struct dsa_switch *ds = cpu_dp->ds;
	int count = 0;

	if (sset == ETH_SS_PHY_STATS && dev->phydev &&
	    !ops->get_ethtool_phy_stats)
		count = phy_ethtool_get_sset_count(dev->phydev);
	else if (ops->get_sset_count)
		count = ops->get_sset_count(dev, sset);

	if (count < 0)
		count = 0;

	if (ds->ops->get_sset_count)
		count += ds->ops->get_sset_count(ds, cpu_dp->index, sset);

	return count;
}

static void dsa_master_get_strings(struct net_device *dev, uint32_t stringset,
				   uint8_t *data)
{
	struct dsa_port *cpu_dp = dev->dsa_ptr;
	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
	struct dsa_switch *ds = cpu_dp->ds;
	int port = cpu_dp->index;
	int len = ETH_GSTRING_LEN;
	int mcount = 0, count;
	unsigned int i;
	uint8_t pfx[4];
	uint8_t *ndata;

	snprintf(pfx, sizeof(pfx), "p%.2d", port);
	/* We do not want to be NULL-terminated, since this is a prefix */
	pfx[sizeof(pfx) - 1] = '_';

	if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
	    !ops->get_ethtool_phy_stats) {
		mcount = phy_ethtool_get_sset_count(dev->phydev);
		if (mcount < 0)
			mcount = 0;
		else
			phy_ethtool_get_strings(dev->phydev, data);
	} else if (ops->get_sset_count && ops->get_strings) {
		mcount = ops->get_sset_count(dev, stringset);
		if (mcount < 0)
			mcount = 0;
		ops->get_strings(dev, stringset, data);
	}

	if (ds->ops->get_strings) {
		ndata = data + mcount * len;
		/* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
		 * the output after to prepend our CPU port prefix we
		 * constructed earlier
		 */
		ds->ops->get_strings(ds, port, stringset, ndata);
		count = ds->ops->get_sset_count(ds, port, stringset);
		for (i = 0; i < count; i++) {
			memmove(ndata + (i * len + sizeof(pfx)),
				ndata + i * len, len - sizeof(pfx));
			memcpy(ndata + i * len, pfx, sizeof(pfx));
		}
	}
}

static int dsa_master_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct dsa_port *cpu_dp = dev->dsa_ptr;
	struct dsa_switch *ds = cpu_dp->ds;
	struct dsa_switch_tree *dst;
	int err = -EOPNOTSUPP;
	struct dsa_port *dp;

	dst = ds->dst;

	switch (cmd) {
	case SIOCGHWTSTAMP:
	case SIOCSHWTSTAMP:
		/* Deny PTP operations on master if there is at least one
		 * switch in the tree that is PTP capable.
		 */
		list_for_each_entry(dp, &dst->ports, list)
			if (dp->ds->ops->port_hwtstamp_get ||
			    dp->ds->ops->port_hwtstamp_set)
				return -EBUSY;
		break;
	}

	if (dev->netdev_ops->ndo_do_ioctl)
		err = dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);

	return err;
}

static const struct dsa_netdevice_ops dsa_netdev_ops = {
	.ndo_do_ioctl = dsa_master_ioctl,
};

static int dsa_master_ethtool_setup(struct net_device *dev)
{
	struct dsa_port *cpu_dp = dev->dsa_ptr;
	struct dsa_switch *ds = cpu_dp->ds;
	struct ethtool_ops *ops;

	ops = devm_kzalloc(ds->dev, sizeof(*ops), GFP_KERNEL);
	if (!ops)
		return -ENOMEM;

	cpu_dp->orig_ethtool_ops = dev->ethtool_ops;
	if (cpu_dp->orig_ethtool_ops)
		memcpy(ops, cpu_dp->orig_ethtool_ops, sizeof(*ops));

	ops->get_regs_len = dsa_master_get_regs_len;
	ops->get_regs = dsa_master_get_regs;
	ops->get_sset_count = dsa_master_get_sset_count;
	ops->get_ethtool_stats = dsa_master_get_ethtool_stats;
	ops->get_strings = dsa_master_get_strings;
	ops->get_ethtool_phy_stats = dsa_master_get_ethtool_phy_stats;

	dev->ethtool_ops = ops;

	return 0;
}

static void dsa_master_ethtool_teardown(struct net_device *dev)
{
	struct dsa_port *cpu_dp = dev->dsa_ptr;

	dev->ethtool_ops = cpu_dp->orig_ethtool_ops;
	cpu_dp->orig_ethtool_ops = NULL;
}

static void dsa_netdev_ops_set(struct net_device *dev,
			       const struct dsa_netdevice_ops *ops)
{
	dev->dsa_ptr->netdev_ops = ops;
}

static void dsa_master_set_promiscuity(struct net_device *dev, int inc)
{
	const struct dsa_device_ops *ops = dev->dsa_ptr->tag_ops;

	if (!ops->promisc_on_master)
		return;

	rtnl_lock();
	dev_set_promiscuity(dev, inc);
	rtnl_unlock();
}

static ssize_t tagging_show(struct device *d, struct device_attribute *attr,
			    char *buf)
{
	struct net_device *dev = to_net_dev(d);
	struct dsa_port *cpu_dp = dev->dsa_ptr;

	return sprintf(buf, "%s\n",
		       dsa_tag_protocol_to_str(cpu_dp->tag_ops));
}
static DEVICE_ATTR_RO(tagging);

static struct attribute *dsa_slave_attrs[] = {
	&dev_attr_tagging.attr,
	NULL
};

static const struct attribute_group dsa_group = {
	.name	= "dsa",
	.attrs	= dsa_slave_attrs,
};

static void dsa_master_reset_mtu(struct net_device *dev)
{
	int err;

	rtnl_lock();
	err = dev_set_mtu(dev, ETH_DATA_LEN);
	if (err)
		netdev_dbg(dev,
			   "Unable to reset MTU to exclude DSA overheads\n");
	rtnl_unlock();
}

static struct lock_class_key dsa_master_addr_list_lock_key;

int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
{
	int ret;

	rtnl_lock();
	ret = dev_set_mtu(dev, ETH_DATA_LEN + cpu_dp->tag_ops->overhead);
	rtnl_unlock();
	if (ret)
		netdev_warn(dev, "error %d setting MTU to include DSA overhead\n",
			    ret);

	/* If we use a tagging format that doesn't have an ethertype
	 * field, make sure that all packets from this point on get
	 * sent to the tag format's receive function.
	 */
	wmb();

	dev->dsa_ptr = cpu_dp;
	lockdep_set_class(&dev->addr_list_lock,
			  &dsa_master_addr_list_lock_key);

	dsa_master_set_promiscuity(dev, 1);

	ret = dsa_master_ethtool_setup(dev);
	if (ret)
		goto out_err_reset_promisc;

	dsa_netdev_ops_set(dev, &dsa_netdev_ops);

	ret = sysfs_create_group(&dev->dev.kobj, &dsa_group);
	if (ret)
		goto out_err_ndo_teardown;

	return ret;

out_err_ndo_teardown:
	dsa_netdev_ops_set(dev, NULL);
	dsa_master_ethtool_teardown(dev);
out_err_reset_promisc:
	dsa_master_set_promiscuity(dev, -1);
	return ret;
}

void dsa_master_teardown(struct net_device *dev)
{
	sysfs_remove_group(&dev->dev.kobj, &dsa_group);
	dsa_netdev_ops_set(dev, NULL);
	dsa_master_ethtool_teardown(dev);
	dsa_master_reset_mtu(dev);
	dsa_master_set_promiscuity(dev, -1);

	dev->dsa_ptr = NULL;

	/* If we used a tagging format that doesn't have an ethertype
	 * field, make sure that all packets from this point get sent
	 * without the tag and go through the regular receive path.
	 */
	wmb();
}