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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/notifier.h>
18#include <linux/of.h>
19#include <linux/of_mdio.h>
20#include <linux/of_platform.h>
21#include <linux/of_net.h>
22#include <linux/of_gpio.h>
23#include <linux/netdevice.h>
24#include <linux/sysfs.h>
25#include <linux/phy_fixed.h>
26#include <linux/ptp_classify.h>
27#include <linux/gpio/consumer.h>
28#include <linux/etherdevice.h>
29
30#include "dsa_priv.h"
31
32static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
33 struct net_device *dev)
34{
35 /* Just return the original SKB */
36 return skb;
37}
38
39static const struct dsa_device_ops none_ops = {
40 .xmit = dsa_slave_notag_xmit,
41 .rcv = NULL,
42};
43
44const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
45#ifdef CONFIG_NET_DSA_TAG_BRCM
46 [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
47#endif
48#ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND
49 [DSA_TAG_PROTO_BRCM_PREPEND] = &brcm_prepend_netdev_ops,
50#endif
51#ifdef CONFIG_NET_DSA_TAG_DSA
52 [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
53#endif
54#ifdef CONFIG_NET_DSA_TAG_EDSA
55 [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
56#endif
57#ifdef CONFIG_NET_DSA_TAG_KSZ
58 [DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
59#endif
60#ifdef CONFIG_NET_DSA_TAG_LAN9303
61 [DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
62#endif
63#ifdef CONFIG_NET_DSA_TAG_MTK
64 [DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
65#endif
66#ifdef CONFIG_NET_DSA_TAG_QCA
67 [DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
68#endif
69#ifdef CONFIG_NET_DSA_TAG_TRAILER
70 [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
71#endif
72 [DSA_TAG_PROTO_NONE] = &none_ops,
73};
74
75const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
76{
77 const struct dsa_device_ops *ops;
78
79 if (tag_protocol >= DSA_TAG_LAST)
80 return ERR_PTR(-EINVAL);
81 ops = dsa_device_ops[tag_protocol];
82
83 if (!ops)
84 return ERR_PTR(-ENOPROTOOPT);
85
86 return ops;
87}
88
89static int dev_is_class(struct device *dev, void *class)
90{
91 if (dev->class != NULL && !strcmp(dev->class->name, class))
92 return 1;
93
94 return 0;
95}
96
97static struct device *dev_find_class(struct device *parent, char *class)
98{
99 if (dev_is_class(parent, class)) {
100 get_device(parent);
101 return parent;
102 }
103
104 return device_find_child(parent, class, dev_is_class);
105}
106
107struct net_device *dsa_dev_to_net_device(struct device *dev)
108{
109 struct device *d;
110
111 d = dev_find_class(dev, "net");
112 if (d != NULL) {
113 struct net_device *nd;
114
115 nd = to_net_dev(d);
116 dev_hold(nd);
117 put_device(d);
118
119 return nd;
120 }
121
122 return NULL;
123}
124EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
125
126/* Determine if we should defer delivery of skb until we have a rx timestamp.
127 *
128 * Called from dsa_switch_rcv. For now, this will only work if tagging is
129 * enabled on the switch. Normally the MAC driver would retrieve the hardware
130 * timestamp when it reads the packet out of the hardware. However in a DSA
131 * switch, the DSA driver owning the interface to which the packet is
132 * delivered is never notified unless we do so here.
133 */
134static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
135 struct sk_buff *skb)
136{
137 struct dsa_switch *ds = p->dp->ds;
138 unsigned int type;
139
140 if (skb_headroom(skb) < ETH_HLEN)
141 return false;
142
143 __skb_push(skb, ETH_HLEN);
144
145 type = ptp_classify_raw(skb);
146
147 __skb_pull(skb, ETH_HLEN);
148
149 if (type == PTP_CLASS_NONE)
150 return false;
151
152 if (likely(ds->ops->port_rxtstamp))
153 return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
154
155 return false;
156}
157
158static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
159 struct packet_type *pt, struct net_device *unused)
160{
161 struct dsa_port *cpu_dp = dev->dsa_ptr;
162 struct sk_buff *nskb = NULL;
163 struct pcpu_sw_netstats *s;
164 struct dsa_slave_priv *p;
165
166 if (unlikely(!cpu_dp)) {
167 kfree_skb(skb);
168 return 0;
169 }
170
171 skb = skb_unshare(skb, GFP_ATOMIC);
172 if (!skb)
173 return 0;
174
175 nskb = cpu_dp->rcv(skb, dev, pt);
176 if (!nskb) {
177 kfree_skb(skb);
178 return 0;
179 }
180
181 skb = nskb;
182 p = netdev_priv(skb->dev);
183 skb_push(skb, ETH_HLEN);
184 skb->pkt_type = PACKET_HOST;
185 skb->protocol = eth_type_trans(skb, skb->dev);
186
187 s = this_cpu_ptr(p->stats64);
188 u64_stats_update_begin(&s->syncp);
189 s->rx_packets++;
190 s->rx_bytes += skb->len;
191 u64_stats_update_end(&s->syncp);
192
193 if (dsa_skb_defer_rx_timestamp(p, skb))
194 return 0;
195
196 netif_receive_skb(skb);
197
198 return 0;
199}
200
201#ifdef CONFIG_PM_SLEEP
202static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
203{
204 return dsa_is_user_port(ds, p) && ds->ports[p].slave;
205}
206
207int dsa_switch_suspend(struct dsa_switch *ds)
208{
209 int i, ret = 0;
210
211 /* Suspend slave network devices */
212 for (i = 0; i < ds->num_ports; i++) {
213 if (!dsa_is_port_initialized(ds, i))
214 continue;
215
216 ret = dsa_slave_suspend(ds->ports[i].slave);
217 if (ret)
218 return ret;
219 }
220
221 if (ds->ops->suspend)
222 ret = ds->ops->suspend(ds);
223
224 return ret;
225}
226EXPORT_SYMBOL_GPL(dsa_switch_suspend);
227
228int dsa_switch_resume(struct dsa_switch *ds)
229{
230 int i, ret = 0;
231
232 if (ds->ops->resume)
233 ret = ds->ops->resume(ds);
234
235 if (ret)
236 return ret;
237
238 /* Resume 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_resume(ds->ports[i].slave);
244 if (ret)
245 return ret;
246 }
247
248 return 0;
249}
250EXPORT_SYMBOL_GPL(dsa_switch_resume);
251#endif
252
253static struct packet_type dsa_pack_type __read_mostly = {
254 .type = cpu_to_be16(ETH_P_XDSA),
255 .func = dsa_switch_rcv,
256};
257
258static struct workqueue_struct *dsa_owq;
259
260bool dsa_schedule_work(struct work_struct *work)
261{
262 return queue_work(dsa_owq, work);
263}
264
265static ATOMIC_NOTIFIER_HEAD(dsa_notif_chain);
266
267int register_dsa_notifier(struct notifier_block *nb)
268{
269 return atomic_notifier_chain_register(&dsa_notif_chain, nb);
270}
271EXPORT_SYMBOL_GPL(register_dsa_notifier);
272
273int unregister_dsa_notifier(struct notifier_block *nb)
274{
275 return atomic_notifier_chain_unregister(&dsa_notif_chain, nb);
276}
277EXPORT_SYMBOL_GPL(unregister_dsa_notifier);
278
279int call_dsa_notifiers(unsigned long val, struct net_device *dev,
280 struct dsa_notifier_info *info)
281{
282 info->dev = dev;
283 return atomic_notifier_call_chain(&dsa_notif_chain, val, info);
284}
285EXPORT_SYMBOL_GPL(call_dsa_notifiers);
286
287static int __init dsa_init_module(void)
288{
289 int rc;
290
291 dsa_owq = alloc_ordered_workqueue("dsa_ordered",
292 WQ_MEM_RECLAIM);
293 if (!dsa_owq)
294 return -ENOMEM;
295
296 rc = dsa_slave_register_notifier();
297 if (rc)
298 return rc;
299
300 rc = dsa_legacy_register();
301 if (rc)
302 return rc;
303
304 dev_add_pack(&dsa_pack_type);
305
306 return 0;
307}
308module_init(dsa_init_module);
309
310static void __exit dsa_cleanup_module(void)
311{
312 dsa_slave_unregister_notifier();
313 dev_remove_pack(&dsa_pack_type);
314 dsa_legacy_unregister();
315 destroy_workqueue(dsa_owq);
316}
317module_exit(dsa_cleanup_module);
318
319MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
320MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
321MODULE_LICENSE("GPL");
322MODULE_ALIAS("platform:dsa");
1/*
2 * net/dsa/dsa.c - Hardware switch handling
3 * Copyright (c) 2008-2009 Marvell Semiconductor
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 */
10
11#include <linux/list.h>
12#include <linux/netdevice.h>
13#include <linux/platform_device.h>
14#include <linux/slab.h>
15#include <linux/module.h>
16#include <net/dsa.h>
17#include "dsa_priv.h"
18
19char dsa_driver_version[] = "0.1";
20
21
22/* switch driver registration ***********************************************/
23static DEFINE_MUTEX(dsa_switch_drivers_mutex);
24static LIST_HEAD(dsa_switch_drivers);
25
26void register_switch_driver(struct dsa_switch_driver *drv)
27{
28 mutex_lock(&dsa_switch_drivers_mutex);
29 list_add_tail(&drv->list, &dsa_switch_drivers);
30 mutex_unlock(&dsa_switch_drivers_mutex);
31}
32EXPORT_SYMBOL_GPL(register_switch_driver);
33
34void unregister_switch_driver(struct dsa_switch_driver *drv)
35{
36 mutex_lock(&dsa_switch_drivers_mutex);
37 list_del_init(&drv->list);
38 mutex_unlock(&dsa_switch_drivers_mutex);
39}
40EXPORT_SYMBOL_GPL(unregister_switch_driver);
41
42static struct dsa_switch_driver *
43dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
44{
45 struct dsa_switch_driver *ret;
46 struct list_head *list;
47 char *name;
48
49 ret = NULL;
50 name = NULL;
51
52 mutex_lock(&dsa_switch_drivers_mutex);
53 list_for_each(list, &dsa_switch_drivers) {
54 struct dsa_switch_driver *drv;
55
56 drv = list_entry(list, struct dsa_switch_driver, list);
57
58 name = drv->probe(bus, sw_addr);
59 if (name != NULL) {
60 ret = drv;
61 break;
62 }
63 }
64 mutex_unlock(&dsa_switch_drivers_mutex);
65
66 *_name = name;
67
68 return ret;
69}
70
71
72/* basic switch operations **************************************************/
73static struct dsa_switch *
74dsa_switch_setup(struct dsa_switch_tree *dst, int index,
75 struct device *parent, struct mii_bus *bus)
76{
77 struct dsa_chip_data *pd = dst->pd->chip + index;
78 struct dsa_switch_driver *drv;
79 struct dsa_switch *ds;
80 int ret;
81 char *name;
82 int i;
83
84 /*
85 * Probe for switch model.
86 */
87 drv = dsa_switch_probe(bus, pd->sw_addr, &name);
88 if (drv == NULL) {
89 printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
90 dst->master_netdev->name, index);
91 return ERR_PTR(-EINVAL);
92 }
93 printk(KERN_INFO "%s[%d]: detected a %s switch\n",
94 dst->master_netdev->name, index, name);
95
96
97 /*
98 * Allocate and initialise switch state.
99 */
100 ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
101 if (ds == NULL)
102 return ERR_PTR(-ENOMEM);
103
104 ds->dst = dst;
105 ds->index = index;
106 ds->pd = dst->pd->chip + index;
107 ds->drv = drv;
108 ds->master_mii_bus = bus;
109
110
111 /*
112 * Validate supplied switch configuration.
113 */
114 for (i = 0; i < DSA_MAX_PORTS; i++) {
115 char *name;
116
117 name = pd->port_names[i];
118 if (name == NULL)
119 continue;
120
121 if (!strcmp(name, "cpu")) {
122 if (dst->cpu_switch != -1) {
123 printk(KERN_ERR "multiple cpu ports?!\n");
124 ret = -EINVAL;
125 goto out;
126 }
127 dst->cpu_switch = index;
128 dst->cpu_port = i;
129 } else if (!strcmp(name, "dsa")) {
130 ds->dsa_port_mask |= 1 << i;
131 } else {
132 ds->phys_port_mask |= 1 << i;
133 }
134 }
135
136
137 /*
138 * If the CPU connects to this switch, set the switch tree
139 * tagging protocol to the preferred tagging format of this
140 * switch.
141 */
142 if (ds->dst->cpu_switch == index)
143 ds->dst->tag_protocol = drv->tag_protocol;
144
145
146 /*
147 * Do basic register setup.
148 */
149 ret = drv->setup(ds);
150 if (ret < 0)
151 goto out;
152
153 ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
154 if (ret < 0)
155 goto out;
156
157 ds->slave_mii_bus = mdiobus_alloc();
158 if (ds->slave_mii_bus == NULL) {
159 ret = -ENOMEM;
160 goto out;
161 }
162 dsa_slave_mii_bus_init(ds);
163
164 ret = mdiobus_register(ds->slave_mii_bus);
165 if (ret < 0)
166 goto out_free;
167
168
169 /*
170 * Create network devices for physical switch ports.
171 */
172 for (i = 0; i < DSA_MAX_PORTS; i++) {
173 struct net_device *slave_dev;
174
175 if (!(ds->phys_port_mask & (1 << i)))
176 continue;
177
178 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
179 if (slave_dev == NULL) {
180 printk(KERN_ERR "%s[%d]: can't create dsa "
181 "slave device for port %d(%s)\n",
182 dst->master_netdev->name,
183 index, i, pd->port_names[i]);
184 continue;
185 }
186
187 ds->ports[i] = slave_dev;
188 }
189
190 return ds;
191
192out_free:
193 mdiobus_free(ds->slave_mii_bus);
194out:
195 kfree(ds);
196 return ERR_PTR(ret);
197}
198
199static void dsa_switch_destroy(struct dsa_switch *ds)
200{
201}
202
203
204/* link polling *************************************************************/
205static void dsa_link_poll_work(struct work_struct *ugly)
206{
207 struct dsa_switch_tree *dst;
208 int i;
209
210 dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
211
212 for (i = 0; i < dst->pd->nr_chips; i++) {
213 struct dsa_switch *ds = dst->ds[i];
214
215 if (ds != NULL && ds->drv->poll_link != NULL)
216 ds->drv->poll_link(ds);
217 }
218
219 mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
220}
221
222static void dsa_link_poll_timer(unsigned long _dst)
223{
224 struct dsa_switch_tree *dst = (void *)_dst;
225
226 schedule_work(&dst->link_poll_work);
227}
228
229
230/* platform driver init and cleanup *****************************************/
231static int dev_is_class(struct device *dev, void *class)
232{
233 if (dev->class != NULL && !strcmp(dev->class->name, class))
234 return 1;
235
236 return 0;
237}
238
239static struct device *dev_find_class(struct device *parent, char *class)
240{
241 if (dev_is_class(parent, class)) {
242 get_device(parent);
243 return parent;
244 }
245
246 return device_find_child(parent, class, dev_is_class);
247}
248
249static struct mii_bus *dev_to_mii_bus(struct device *dev)
250{
251 struct device *d;
252
253 d = dev_find_class(dev, "mdio_bus");
254 if (d != NULL) {
255 struct mii_bus *bus;
256
257 bus = to_mii_bus(d);
258 put_device(d);
259
260 return bus;
261 }
262
263 return NULL;
264}
265
266static struct net_device *dev_to_net_device(struct device *dev)
267{
268 struct device *d;
269
270 d = dev_find_class(dev, "net");
271 if (d != NULL) {
272 struct net_device *nd;
273
274 nd = to_net_dev(d);
275 dev_hold(nd);
276 put_device(d);
277
278 return nd;
279 }
280
281 return NULL;
282}
283
284static int dsa_probe(struct platform_device *pdev)
285{
286 static int dsa_version_printed;
287 struct dsa_platform_data *pd = pdev->dev.platform_data;
288 struct net_device *dev;
289 struct dsa_switch_tree *dst;
290 int i;
291
292 if (!dsa_version_printed++)
293 printk(KERN_NOTICE "Distributed Switch Architecture "
294 "driver version %s\n", dsa_driver_version);
295
296 if (pd == NULL || pd->netdev == NULL)
297 return -EINVAL;
298
299 dev = dev_to_net_device(pd->netdev);
300 if (dev == NULL)
301 return -EINVAL;
302
303 if (dev->dsa_ptr != NULL) {
304 dev_put(dev);
305 return -EEXIST;
306 }
307
308 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
309 if (dst == NULL) {
310 dev_put(dev);
311 return -ENOMEM;
312 }
313
314 platform_set_drvdata(pdev, dst);
315
316 dst->pd = pd;
317 dst->master_netdev = dev;
318 dst->cpu_switch = -1;
319 dst->cpu_port = -1;
320
321 for (i = 0; i < pd->nr_chips; i++) {
322 struct mii_bus *bus;
323 struct dsa_switch *ds;
324
325 bus = dev_to_mii_bus(pd->chip[i].mii_bus);
326 if (bus == NULL) {
327 printk(KERN_ERR "%s[%d]: no mii bus found for "
328 "dsa switch\n", dev->name, i);
329 continue;
330 }
331
332 ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
333 if (IS_ERR(ds)) {
334 printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
335 "instance (error %ld)\n", dev->name, i,
336 PTR_ERR(ds));
337 continue;
338 }
339
340 dst->ds[i] = ds;
341 if (ds->drv->poll_link != NULL)
342 dst->link_poll_needed = 1;
343 }
344
345 /*
346 * If we use a tagging format that doesn't have an ethertype
347 * field, make sure that all packets from this point on get
348 * sent to the tag format's receive function.
349 */
350 wmb();
351 dev->dsa_ptr = (void *)dst;
352
353 if (dst->link_poll_needed) {
354 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
355 init_timer(&dst->link_poll_timer);
356 dst->link_poll_timer.data = (unsigned long)dst;
357 dst->link_poll_timer.function = dsa_link_poll_timer;
358 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
359 add_timer(&dst->link_poll_timer);
360 }
361
362 return 0;
363}
364
365static int dsa_remove(struct platform_device *pdev)
366{
367 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
368 int i;
369
370 if (dst->link_poll_needed)
371 del_timer_sync(&dst->link_poll_timer);
372
373 flush_work_sync(&dst->link_poll_work);
374
375 for (i = 0; i < dst->pd->nr_chips; i++) {
376 struct dsa_switch *ds = dst->ds[i];
377
378 if (ds != NULL)
379 dsa_switch_destroy(ds);
380 }
381
382 return 0;
383}
384
385static void dsa_shutdown(struct platform_device *pdev)
386{
387}
388
389static struct platform_driver dsa_driver = {
390 .probe = dsa_probe,
391 .remove = dsa_remove,
392 .shutdown = dsa_shutdown,
393 .driver = {
394 .name = "dsa",
395 .owner = THIS_MODULE,
396 },
397};
398
399static int __init dsa_init_module(void)
400{
401 int rc;
402
403 rc = platform_driver_register(&dsa_driver);
404 if (rc)
405 return rc;
406
407#ifdef CONFIG_NET_DSA_TAG_DSA
408 dev_add_pack(&dsa_packet_type);
409#endif
410#ifdef CONFIG_NET_DSA_TAG_EDSA
411 dev_add_pack(&edsa_packet_type);
412#endif
413#ifdef CONFIG_NET_DSA_TAG_TRAILER
414 dev_add_pack(&trailer_packet_type);
415#endif
416 return 0;
417}
418module_init(dsa_init_module);
419
420static void __exit dsa_cleanup_module(void)
421{
422#ifdef CONFIG_NET_DSA_TAG_TRAILER
423 dev_remove_pack(&trailer_packet_type);
424#endif
425#ifdef CONFIG_NET_DSA_TAG_EDSA
426 dev_remove_pack(&edsa_packet_type);
427#endif
428#ifdef CONFIG_NET_DSA_TAG_DSA
429 dev_remove_pack(&dsa_packet_type);
430#endif
431 platform_driver_unregister(&dsa_driver);
432}
433module_exit(dsa_cleanup_module);
434
435MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
436MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
437MODULE_LICENSE("GPL");
438MODULE_ALIAS("platform:dsa");