xref: /openbmc/linux/net/dsa/dsa.c (revision ca481398)
1  /*
2   * net/dsa/dsa.c - Hardware switch handling
3   * Copyright (c) 2008-2009 Marvell Semiconductor
4   * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
5   *
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.
10   */
11  
12  #include <linux/device.h>
13  #include <linux/list.h>
14  #include <linux/platform_device.h>
15  #include <linux/slab.h>
16  #include <linux/module.h>
17  #include <linux/of.h>
18  #include <linux/of_mdio.h>
19  #include <linux/of_platform.h>
20  #include <linux/of_net.h>
21  #include <linux/of_gpio.h>
22  #include <linux/netdevice.h>
23  #include <linux/sysfs.h>
24  #include <linux/phy_fixed.h>
25  #include <linux/gpio/consumer.h>
26  #include <linux/etherdevice.h>
27  
28  #include "dsa_priv.h"
29  
30  static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
31  					    struct net_device *dev)
32  {
33  	/* Just return the original SKB */
34  	return skb;
35  }
36  
37  static const struct dsa_device_ops none_ops = {
38  	.xmit	= dsa_slave_notag_xmit,
39  	.rcv	= NULL,
40  };
41  
42  const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
43  #ifdef CONFIG_NET_DSA_TAG_BRCM
44  	[DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
45  #endif
46  #ifdef CONFIG_NET_DSA_TAG_DSA
47  	[DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
48  #endif
49  #ifdef CONFIG_NET_DSA_TAG_EDSA
50  	[DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
51  #endif
52  #ifdef CONFIG_NET_DSA_TAG_KSZ
53  	[DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
54  #endif
55  #ifdef CONFIG_NET_DSA_TAG_LAN9303
56  	[DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
57  #endif
58  #ifdef CONFIG_NET_DSA_TAG_MTK
59  	[DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
60  #endif
61  #ifdef CONFIG_NET_DSA_TAG_QCA
62  	[DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
63  #endif
64  #ifdef CONFIG_NET_DSA_TAG_TRAILER
65  	[DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
66  #endif
67  	[DSA_TAG_PROTO_NONE] = &none_ops,
68  };
69  
70  int dsa_cpu_dsa_setup(struct dsa_port *port)
71  {
72  	struct device_node *port_dn = port->dn;
73  	struct dsa_switch *ds = port->ds;
74  	struct phy_device *phydev;
75  	int ret, mode;
76  
77  	if (of_phy_is_fixed_link(port_dn)) {
78  		ret = of_phy_register_fixed_link(port_dn);
79  		if (ret) {
80  			dev_err(ds->dev, "failed to register fixed PHY\n");
81  			return ret;
82  		}
83  		phydev = of_phy_find_device(port_dn);
84  
85  		mode = of_get_phy_mode(port_dn);
86  		if (mode < 0)
87  			mode = PHY_INTERFACE_MODE_NA;
88  		phydev->interface = mode;
89  
90  		genphy_config_init(phydev);
91  		genphy_read_status(phydev);
92  		if (ds->ops->adjust_link)
93  			ds->ops->adjust_link(ds, port->index, phydev);
94  
95  		put_device(&phydev->mdio.dev);
96  	}
97  
98  	return 0;
99  }
100  
101  const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
102  {
103  	const struct dsa_device_ops *ops;
104  
105  	if (tag_protocol >= DSA_TAG_LAST)
106  		return ERR_PTR(-EINVAL);
107  	ops = dsa_device_ops[tag_protocol];
108  
109  	if (!ops)
110  		return ERR_PTR(-ENOPROTOOPT);
111  
112  	return ops;
113  }
114  
115  int dsa_cpu_port_ethtool_setup(struct dsa_port *cpu_dp)
116  {
117  	struct dsa_switch *ds = cpu_dp->ds;
118  	struct net_device *master;
119  	struct ethtool_ops *cpu_ops;
120  
121  	master = cpu_dp->netdev;
122  
123  	cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
124  	if (!cpu_ops)
125  		return -ENOMEM;
126  
127  	memcpy(&cpu_dp->ethtool_ops, master->ethtool_ops,
128  	       sizeof(struct ethtool_ops));
129  	cpu_dp->orig_ethtool_ops = master->ethtool_ops;
130  	memcpy(cpu_ops, &cpu_dp->ethtool_ops,
131  	       sizeof(struct ethtool_ops));
132  	dsa_cpu_port_ethtool_init(cpu_ops);
133  	master->ethtool_ops = cpu_ops;
134  
135  	return 0;
136  }
137  
138  void dsa_cpu_port_ethtool_restore(struct dsa_port *cpu_dp)
139  {
140  	cpu_dp->netdev->ethtool_ops = cpu_dp->orig_ethtool_ops;
141  }
142  
143  void dsa_cpu_dsa_destroy(struct dsa_port *port)
144  {
145  	struct device_node *port_dn = port->dn;
146  
147  	if (of_phy_is_fixed_link(port_dn))
148  		of_phy_deregister_fixed_link(port_dn);
149  }
150  
151  static int dev_is_class(struct device *dev, void *class)
152  {
153  	if (dev->class != NULL && !strcmp(dev->class->name, class))
154  		return 1;
155  
156  	return 0;
157  }
158  
159  static struct device *dev_find_class(struct device *parent, char *class)
160  {
161  	if (dev_is_class(parent, class)) {
162  		get_device(parent);
163  		return parent;
164  	}
165  
166  	return device_find_child(parent, class, dev_is_class);
167  }
168  
169  struct net_device *dsa_dev_to_net_device(struct device *dev)
170  {
171  	struct device *d;
172  
173  	d = dev_find_class(dev, "net");
174  	if (d != NULL) {
175  		struct net_device *nd;
176  
177  		nd = to_net_dev(d);
178  		dev_hold(nd);
179  		put_device(d);
180  
181  		return nd;
182  	}
183  
184  	return NULL;
185  }
186  EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
187  
188  static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
189  			  struct packet_type *pt, struct net_device *unused)
190  {
191  	struct dsa_switch_tree *dst = dev->dsa_ptr;
192  	struct sk_buff *nskb = NULL;
193  	struct pcpu_sw_netstats *s;
194  	struct dsa_slave_priv *p;
195  
196  	if (unlikely(dst == NULL)) {
197  		kfree_skb(skb);
198  		return 0;
199  	}
200  
201  	skb = skb_unshare(skb, GFP_ATOMIC);
202  	if (!skb)
203  		return 0;
204  
205  	nskb = dst->rcv(skb, dev, pt);
206  	if (!nskb) {
207  		kfree_skb(skb);
208  		return 0;
209  	}
210  
211  	skb = nskb;
212  	p = netdev_priv(skb->dev);
213  	skb_push(skb, ETH_HLEN);
214  	skb->pkt_type = PACKET_HOST;
215  	skb->protocol = eth_type_trans(skb, skb->dev);
216  
217  	s = this_cpu_ptr(p->stats64);
218  	u64_stats_update_begin(&s->syncp);
219  	s->rx_packets++;
220  	s->rx_bytes += skb->len;
221  	u64_stats_update_end(&s->syncp);
222  
223  	netif_receive_skb(skb);
224  
225  	return 0;
226  }
227  
228  #ifdef CONFIG_PM_SLEEP
229  static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
230  {
231  	return ds->enabled_port_mask & (1 << p) && ds->ports[p].netdev;
232  }
233  
234  int dsa_switch_suspend(struct dsa_switch *ds)
235  {
236  	int i, ret = 0;
237  
238  	/* Suspend slave network devices */
239  	for (i = 0; i < ds->num_ports; i++) {
240  		if (!dsa_is_port_initialized(ds, i))
241  			continue;
242  
243  		ret = dsa_slave_suspend(ds->ports[i].netdev);
244  		if (ret)
245  			return ret;
246  	}
247  
248  	if (ds->ops->suspend)
249  		ret = ds->ops->suspend(ds);
250  
251  	return ret;
252  }
253  EXPORT_SYMBOL_GPL(dsa_switch_suspend);
254  
255  int dsa_switch_resume(struct dsa_switch *ds)
256  {
257  	int i, ret = 0;
258  
259  	if (ds->ops->resume)
260  		ret = ds->ops->resume(ds);
261  
262  	if (ret)
263  		return ret;
264  
265  	/* Resume slave network devices */
266  	for (i = 0; i < ds->num_ports; i++) {
267  		if (!dsa_is_port_initialized(ds, i))
268  			continue;
269  
270  		ret = dsa_slave_resume(ds->ports[i].netdev);
271  		if (ret)
272  			return ret;
273  	}
274  
275  	return 0;
276  }
277  EXPORT_SYMBOL_GPL(dsa_switch_resume);
278  #endif
279  
280  static struct packet_type dsa_pack_type __read_mostly = {
281  	.type	= cpu_to_be16(ETH_P_XDSA),
282  	.func	= dsa_switch_rcv,
283  };
284  
285  static struct workqueue_struct *dsa_owq;
286  
287  bool dsa_schedule_work(struct work_struct *work)
288  {
289  	return queue_work(dsa_owq, work);
290  }
291  
292  static int __init dsa_init_module(void)
293  {
294  	int rc;
295  
296  	dsa_owq = alloc_ordered_workqueue("dsa_ordered",
297  					  WQ_MEM_RECLAIM);
298  	if (!dsa_owq)
299  		return -ENOMEM;
300  
301  	rc = dsa_slave_register_notifier();
302  	if (rc)
303  		return rc;
304  
305  	rc = dsa_legacy_register();
306  	if (rc)
307  		return rc;
308  
309  	dev_add_pack(&dsa_pack_type);
310  
311  	return 0;
312  }
313  module_init(dsa_init_module);
314  
315  static void __exit dsa_cleanup_module(void)
316  {
317  	dsa_slave_unregister_notifier();
318  	dev_remove_pack(&dsa_pack_type);
319  	dsa_legacy_unregister();
320  	destroy_workqueue(dsa_owq);
321  }
322  module_exit(dsa_cleanup_module);
323  
324  MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
325  MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
326  MODULE_LICENSE("GPL");
327  MODULE_ALIAS("platform:dsa");
328