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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/dsa/dsa.c - Hardware switch handling
4 * Copyright (c) 2008-2009 Marvell Semiconductor
5 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
6 */
7
8#include <linux/device.h>
9#include <linux/list.h>
10#include <linux/platform_device.h>
11#include <linux/slab.h>
12#include <linux/module.h>
13#include <linux/notifier.h>
14#include <linux/of.h>
15#include <linux/of_mdio.h>
16#include <linux/of_platform.h>
17#include <linux/of_net.h>
18#include <linux/netdevice.h>
19#include <linux/sysfs.h>
20#include <linux/phy_fixed.h>
21#include <linux/ptp_classify.h>
22#include <linux/etherdevice.h>
23
24#include "dsa_priv.h"
25
26static LIST_HEAD(dsa_tag_drivers_list);
27static DEFINE_MUTEX(dsa_tag_drivers_lock);
28
29static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
30 struct net_device *dev)
31{
32 /* Just return the original SKB */
33 return skb;
34}
35
36static const struct dsa_device_ops none_ops = {
37 .name = "none",
38 .proto = DSA_TAG_PROTO_NONE,
39 .xmit = dsa_slave_notag_xmit,
40 .rcv = NULL,
41};
42
43DSA_TAG_DRIVER(none_ops);
44
45static void dsa_tag_driver_register(struct dsa_tag_driver *dsa_tag_driver,
46 struct module *owner)
47{
48 dsa_tag_driver->owner = owner;
49
50 mutex_lock(&dsa_tag_drivers_lock);
51 list_add_tail(&dsa_tag_driver->list, &dsa_tag_drivers_list);
52 mutex_unlock(&dsa_tag_drivers_lock);
53}
54
55void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
56 unsigned int count, struct module *owner)
57{
58 unsigned int i;
59
60 for (i = 0; i < count; i++)
61 dsa_tag_driver_register(dsa_tag_driver_array[i], owner);
62}
63
64static void dsa_tag_driver_unregister(struct dsa_tag_driver *dsa_tag_driver)
65{
66 mutex_lock(&dsa_tag_drivers_lock);
67 list_del(&dsa_tag_driver->list);
68 mutex_unlock(&dsa_tag_drivers_lock);
69}
70EXPORT_SYMBOL_GPL(dsa_tag_drivers_register);
71
72void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
73 unsigned int count)
74{
75 unsigned int i;
76
77 for (i = 0; i < count; i++)
78 dsa_tag_driver_unregister(dsa_tag_driver_array[i]);
79}
80EXPORT_SYMBOL_GPL(dsa_tag_drivers_unregister);
81
82const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
83{
84 return ops->name;
85};
86
87const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
88{
89 struct dsa_tag_driver *dsa_tag_driver;
90 const struct dsa_device_ops *ops;
91 char module_name[128];
92 bool found = false;
93
94 snprintf(module_name, 127, "%s%d", DSA_TAG_DRIVER_ALIAS,
95 tag_protocol);
96
97 request_module(module_name);
98
99 mutex_lock(&dsa_tag_drivers_lock);
100 list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
101 ops = dsa_tag_driver->ops;
102 if (ops->proto == tag_protocol) {
103 found = true;
104 break;
105 }
106 }
107
108 if (found) {
109 if (!try_module_get(dsa_tag_driver->owner))
110 ops = ERR_PTR(-ENOPROTOOPT);
111 } else {
112 ops = ERR_PTR(-ENOPROTOOPT);
113 }
114
115 mutex_unlock(&dsa_tag_drivers_lock);
116
117 return ops;
118}
119
120void dsa_tag_driver_put(const struct dsa_device_ops *ops)
121{
122 struct dsa_tag_driver *dsa_tag_driver;
123
124 mutex_lock(&dsa_tag_drivers_lock);
125 list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
126 if (dsa_tag_driver->ops == ops) {
127 module_put(dsa_tag_driver->owner);
128 break;
129 }
130 }
131 mutex_unlock(&dsa_tag_drivers_lock);
132}
133
134static int dev_is_class(struct device *dev, void *class)
135{
136 if (dev->class != NULL && !strcmp(dev->class->name, class))
137 return 1;
138
139 return 0;
140}
141
142static struct device *dev_find_class(struct device *parent, char *class)
143{
144 if (dev_is_class(parent, class)) {
145 get_device(parent);
146 return parent;
147 }
148
149 return device_find_child(parent, class, dev_is_class);
150}
151
152struct net_device *dsa_dev_to_net_device(struct device *dev)
153{
154 struct device *d;
155
156 d = dev_find_class(dev, "net");
157 if (d != NULL) {
158 struct net_device *nd;
159
160 nd = to_net_dev(d);
161 dev_hold(nd);
162 put_device(d);
163
164 return nd;
165 }
166
167 return NULL;
168}
169EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
170
171/* Determine if we should defer delivery of skb until we have a rx timestamp.
172 *
173 * Called from dsa_switch_rcv. For now, this will only work if tagging is
174 * enabled on the switch. Normally the MAC driver would retrieve the hardware
175 * timestamp when it reads the packet out of the hardware. However in a DSA
176 * switch, the DSA driver owning the interface to which the packet is
177 * delivered is never notified unless we do so here.
178 */
179static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
180 struct sk_buff *skb)
181{
182 struct dsa_switch *ds = p->dp->ds;
183 unsigned int type;
184
185 if (skb_headroom(skb) < ETH_HLEN)
186 return false;
187
188 __skb_push(skb, ETH_HLEN);
189
190 type = ptp_classify_raw(skb);
191
192 __skb_pull(skb, ETH_HLEN);
193
194 if (type == PTP_CLASS_NONE)
195 return false;
196
197 if (likely(ds->ops->port_rxtstamp))
198 return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
199
200 return false;
201}
202
203static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
204 struct packet_type *pt, struct net_device *unused)
205{
206 struct dsa_port *cpu_dp = dev->dsa_ptr;
207 struct sk_buff *nskb = NULL;
208 struct pcpu_sw_netstats *s;
209 struct dsa_slave_priv *p;
210
211 if (unlikely(!cpu_dp)) {
212 kfree_skb(skb);
213 return 0;
214 }
215
216 skb = skb_unshare(skb, GFP_ATOMIC);
217 if (!skb)
218 return 0;
219
220 nskb = cpu_dp->rcv(skb, dev, pt);
221 if (!nskb) {
222 kfree_skb(skb);
223 return 0;
224 }
225
226 skb = nskb;
227 p = netdev_priv(skb->dev);
228 skb_push(skb, ETH_HLEN);
229 skb->pkt_type = PACKET_HOST;
230 skb->protocol = eth_type_trans(skb, skb->dev);
231
232 s = this_cpu_ptr(p->stats64);
233 u64_stats_update_begin(&s->syncp);
234 s->rx_packets++;
235 s->rx_bytes += skb->len;
236 u64_stats_update_end(&s->syncp);
237
238 if (dsa_skb_defer_rx_timestamp(p, skb))
239 return 0;
240
241 netif_receive_skb(skb);
242
243 return 0;
244}
245
246#ifdef CONFIG_PM_SLEEP
247static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
248{
249 return dsa_is_user_port(ds, p) && ds->ports[p].slave;
250}
251
252int dsa_switch_suspend(struct dsa_switch *ds)
253{
254 int i, ret = 0;
255
256 /* Suspend slave network devices */
257 for (i = 0; i < ds->num_ports; i++) {
258 if (!dsa_is_port_initialized(ds, i))
259 continue;
260
261 ret = dsa_slave_suspend(ds->ports[i].slave);
262 if (ret)
263 return ret;
264 }
265
266 if (ds->ops->suspend)
267 ret = ds->ops->suspend(ds);
268
269 return ret;
270}
271EXPORT_SYMBOL_GPL(dsa_switch_suspend);
272
273int dsa_switch_resume(struct dsa_switch *ds)
274{
275 int i, ret = 0;
276
277 if (ds->ops->resume)
278 ret = ds->ops->resume(ds);
279
280 if (ret)
281 return ret;
282
283 /* Resume slave network devices */
284 for (i = 0; i < ds->num_ports; i++) {
285 if (!dsa_is_port_initialized(ds, i))
286 continue;
287
288 ret = dsa_slave_resume(ds->ports[i].slave);
289 if (ret)
290 return ret;
291 }
292
293 return 0;
294}
295EXPORT_SYMBOL_GPL(dsa_switch_resume);
296#endif
297
298static struct packet_type dsa_pack_type __read_mostly = {
299 .type = cpu_to_be16(ETH_P_XDSA),
300 .func = dsa_switch_rcv,
301};
302
303static struct workqueue_struct *dsa_owq;
304
305bool dsa_schedule_work(struct work_struct *work)
306{
307 return queue_work(dsa_owq, work);
308}
309
310static ATOMIC_NOTIFIER_HEAD(dsa_notif_chain);
311
312int register_dsa_notifier(struct notifier_block *nb)
313{
314 return atomic_notifier_chain_register(&dsa_notif_chain, nb);
315}
316EXPORT_SYMBOL_GPL(register_dsa_notifier);
317
318int unregister_dsa_notifier(struct notifier_block *nb)
319{
320 return atomic_notifier_chain_unregister(&dsa_notif_chain, nb);
321}
322EXPORT_SYMBOL_GPL(unregister_dsa_notifier);
323
324int call_dsa_notifiers(unsigned long val, struct net_device *dev,
325 struct dsa_notifier_info *info)
326{
327 info->dev = dev;
328 return atomic_notifier_call_chain(&dsa_notif_chain, val, info);
329}
330EXPORT_SYMBOL_GPL(call_dsa_notifiers);
331
332static int __init dsa_init_module(void)
333{
334 int rc;
335
336 dsa_owq = alloc_ordered_workqueue("dsa_ordered",
337 WQ_MEM_RECLAIM);
338 if (!dsa_owq)
339 return -ENOMEM;
340
341 rc = dsa_slave_register_notifier();
342 if (rc)
343 goto register_notifier_fail;
344
345 dev_add_pack(&dsa_pack_type);
346
347 dsa_tag_driver_register(&DSA_TAG_DRIVER_NAME(none_ops),
348 THIS_MODULE);
349
350 return 0;
351
352register_notifier_fail:
353 destroy_workqueue(dsa_owq);
354
355 return rc;
356}
357module_init(dsa_init_module);
358
359static void __exit dsa_cleanup_module(void)
360{
361 dsa_tag_driver_unregister(&DSA_TAG_DRIVER_NAME(none_ops));
362
363 dsa_slave_unregister_notifier();
364 dev_remove_pack(&dsa_pack_type);
365 destroy_workqueue(dsa_owq);
366}
367module_exit(dsa_cleanup_module);
368
369MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
370MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
371MODULE_LICENSE("GPL");
372MODULE_ALIAS("platform:dsa");
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");