summaryrefslogtreecommitdiff
path: root/net/dsa/dsa.c
blob: 6a9d0f50fbeea1ed5394564f2223aec0547b2348 (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
/*
 * net/dsa/dsa.c - Hardware switch handling
 * Copyright (c) 2008-2009 Marvell Semiconductor
 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/device.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/of_net.h>
#include <linux/of_gpio.h>
#include <linux/netdevice.h>
#include <linux/sysfs.h>
#include <linux/phy_fixed.h>
#include <linux/gpio/consumer.h>
#include <linux/etherdevice.h>

#include "dsa_priv.h"

static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
					    struct net_device *dev)
{
	/* Just return the original SKB */
	return skb;
}

static const struct dsa_device_ops none_ops = {
	.xmit	= dsa_slave_notag_xmit,
	.rcv	= NULL,
};

const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
#ifdef CONFIG_NET_DSA_TAG_BRCM
	[DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND
	[DSA_TAG_PROTO_BRCM_PREPEND] = &brcm_prepend_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_DSA
	[DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
	[DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_KSZ
	[DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_LAN9303
	[DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_MTK
	[DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_QCA
	[DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
	[DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
#endif
	[DSA_TAG_PROTO_NONE] = &none_ops,
};

const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
{
	const struct dsa_device_ops *ops;

	if (tag_protocol >= DSA_TAG_LAST)
		return ERR_PTR(-EINVAL);
	ops = dsa_device_ops[tag_protocol];

	if (!ops)
		return ERR_PTR(-ENOPROTOOPT);

	return ops;
}

static int dev_is_class(struct device *dev, void *class)
{
	if (dev->class != NULL && !strcmp(dev->class->name, class))
		return 1;

	return 0;
}

static struct device *dev_find_class(struct device *parent, char *class)
{
	if (dev_is_class(parent, class)) {
		get_device(parent);
		return parent;
	}

	return device_find_child(parent, class, dev_is_class);
}

struct net_device *dsa_dev_to_net_device(struct device *dev)
{
	struct device *d;

	d = dev_find_class(dev, "net");
	if (d != NULL) {
		struct net_device *nd;

		nd = to_net_dev(d);
		dev_hold(nd);
		put_device(d);

		return nd;
	}

	return NULL;
}
EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);

static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
			  struct packet_type *pt, struct net_device *unused)
{
	struct dsa_port *cpu_dp = dev->dsa_ptr;
	struct sk_buff *nskb = NULL;
	struct pcpu_sw_netstats *s;
	struct dsa_slave_priv *p;

	if (unlikely(!cpu_dp)) {
		kfree_skb(skb);
		return 0;
	}

	skb = skb_unshare(skb, GFP_ATOMIC);
	if (!skb)
		return 0;

	nskb = cpu_dp->rcv(skb, dev, pt);
	if (!nskb) {
		kfree_skb(skb);
		return 0;
	}

	skb = nskb;
	p = netdev_priv(skb->dev);
	skb_push(skb, ETH_HLEN);
	skb->pkt_type = PACKET_HOST;
	skb->protocol = eth_type_trans(skb, skb->dev);

	s = this_cpu_ptr(p->stats64);
	u64_stats_update_begin(&s->syncp);
	s->rx_packets++;
	s->rx_bytes += skb->len;
	u64_stats_update_end(&s->syncp);

	netif_receive_skb(skb);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
{
	return dsa_is_user_port(ds, p) && ds->ports[p].slave;
}

int dsa_switch_suspend(struct dsa_switch *ds)
{
	int i, ret = 0;

	/* Suspend slave network devices */
	for (i = 0; i < ds->num_ports; i++) {
		if (!dsa_is_port_initialized(ds, i))
			continue;

		ret = dsa_slave_suspend(ds->ports[i].slave);
		if (ret)
			return ret;
	}

	if (ds->ops->suspend)
		ret = ds->ops->suspend(ds);

	return ret;
}
EXPORT_SYMBOL_GPL(dsa_switch_suspend);

int dsa_switch_resume(struct dsa_switch *ds)
{
	int i, ret = 0;

	if (ds->ops->resume)
		ret = ds->ops->resume(ds);

	if (ret)
		return ret;

	/* Resume slave network devices */
	for (i = 0; i < ds->num_ports; i++) {
		if (!dsa_is_port_initialized(ds, i))
			continue;

		ret = dsa_slave_resume(ds->ports[i].slave);
		if (ret)
			return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(dsa_switch_resume);
#endif

static struct packet_type dsa_pack_type __read_mostly = {
	.type	= cpu_to_be16(ETH_P_XDSA),
	.func	= dsa_switch_rcv,
};

static struct workqueue_struct *dsa_owq;

bool dsa_schedule_work(struct work_struct *work)
{
	return queue_work(dsa_owq, work);
}

static ATOMIC_NOTIFIER_HEAD(dsa_notif_chain);

int register_dsa_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&dsa_notif_chain, nb);
}
EXPORT_SYMBOL_GPL(register_dsa_notifier);

int unregister_dsa_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_unregister(&dsa_notif_chain, nb);
}
EXPORT_SYMBOL_GPL(unregister_dsa_notifier);

int call_dsa_notifiers(unsigned long val, struct net_device *dev,
		       struct dsa_notifier_info *info)
{
	info->dev = dev;
	return atomic_notifier_call_chain(&dsa_notif_chain, val, info);
}
EXPORT_SYMBOL_GPL(call_dsa_notifiers);

static int __init dsa_init_module(void)
{
	int rc;

	dsa_owq = alloc_ordered_workqueue("dsa_ordered",
					  WQ_MEM_RECLAIM);
	if (!dsa_owq)
		return -ENOMEM;

	rc = dsa_slave_register_notifier();
	if (rc)
		return rc;

	rc = dsa_legacy_register();
	if (rc)
		return rc;

	dev_add_pack(&dsa_pack_type);

	return 0;
}
module_init(dsa_init_module);

static void __exit dsa_cleanup_module(void)
{
	dsa_slave_unregister_notifier();
	dev_remove_pack(&dsa_pack_type);
	dsa_legacy_unregister();
	destroy_workqueue(dsa_owq);
}
module_exit(dsa_cleanup_module);

MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:dsa");