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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
87/* Function takes a reference on the module owning the tagger,
88 * so dsa_tag_driver_put must be called afterwards.
89 */
90const struct dsa_device_ops *dsa_find_tagger_by_name(const char *buf)
91{
92 const struct dsa_device_ops *ops = ERR_PTR(-ENOPROTOOPT);
93 struct dsa_tag_driver *dsa_tag_driver;
94
95 mutex_lock(&dsa_tag_drivers_lock);
96 list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
97 const struct dsa_device_ops *tmp = dsa_tag_driver->ops;
98
99 if (!sysfs_streq(buf, tmp->name))
100 continue;
101
102 if (!try_module_get(dsa_tag_driver->owner))
103 break;
104
105 ops = tmp;
106 break;
107 }
108 mutex_unlock(&dsa_tag_drivers_lock);
109
110 return ops;
111}
112
113const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
114{
115 struct dsa_tag_driver *dsa_tag_driver;
116 const struct dsa_device_ops *ops;
117 bool found = false;
118
119 request_module("%s%d", DSA_TAG_DRIVER_ALIAS, tag_protocol);
120
121 mutex_lock(&dsa_tag_drivers_lock);
122 list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
123 ops = dsa_tag_driver->ops;
124 if (ops->proto == tag_protocol) {
125 found = true;
126 break;
127 }
128 }
129
130 if (found) {
131 if (!try_module_get(dsa_tag_driver->owner))
132 ops = ERR_PTR(-ENOPROTOOPT);
133 } else {
134 ops = ERR_PTR(-ENOPROTOOPT);
135 }
136
137 mutex_unlock(&dsa_tag_drivers_lock);
138
139 return ops;
140}
141
142void dsa_tag_driver_put(const struct dsa_device_ops *ops)
143{
144 struct dsa_tag_driver *dsa_tag_driver;
145
146 mutex_lock(&dsa_tag_drivers_lock);
147 list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
148 if (dsa_tag_driver->ops == ops) {
149 module_put(dsa_tag_driver->owner);
150 break;
151 }
152 }
153 mutex_unlock(&dsa_tag_drivers_lock);
154}
155
156static int dev_is_class(struct device *dev, void *class)
157{
158 if (dev->class != NULL && !strcmp(dev->class->name, class))
159 return 1;
160
161 return 0;
162}
163
164static struct device *dev_find_class(struct device *parent, char *class)
165{
166 if (dev_is_class(parent, class)) {
167 get_device(parent);
168 return parent;
169 }
170
171 return device_find_child(parent, class, dev_is_class);
172}
173
174struct net_device *dsa_dev_to_net_device(struct device *dev)
175{
176 struct device *d;
177
178 d = dev_find_class(dev, "net");
179 if (d != NULL) {
180 struct net_device *nd;
181
182 nd = to_net_dev(d);
183 dev_hold(nd);
184 put_device(d);
185
186 return nd;
187 }
188
189 return NULL;
190}
191EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
192
193/* Determine if we should defer delivery of skb until we have a rx timestamp.
194 *
195 * Called from dsa_switch_rcv. For now, this will only work if tagging is
196 * enabled on the switch. Normally the MAC driver would retrieve the hardware
197 * timestamp when it reads the packet out of the hardware. However in a DSA
198 * switch, the DSA driver owning the interface to which the packet is
199 * delivered is never notified unless we do so here.
200 */
201static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
202 struct sk_buff *skb)
203{
204 struct dsa_switch *ds = p->dp->ds;
205 unsigned int type;
206
207 if (skb_headroom(skb) < ETH_HLEN)
208 return false;
209
210 __skb_push(skb, ETH_HLEN);
211
212 type = ptp_classify_raw(skb);
213
214 __skb_pull(skb, ETH_HLEN);
215
216 if (type == PTP_CLASS_NONE)
217 return false;
218
219 if (likely(ds->ops->port_rxtstamp))
220 return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
221
222 return false;
223}
224
225static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
226 struct packet_type *pt, struct net_device *unused)
227{
228 struct dsa_port *cpu_dp = dev->dsa_ptr;
229 struct sk_buff *nskb = NULL;
230 struct dsa_slave_priv *p;
231
232 if (unlikely(!cpu_dp)) {
233 kfree_skb(skb);
234 return 0;
235 }
236
237 skb = skb_unshare(skb, GFP_ATOMIC);
238 if (!skb)
239 return 0;
240
241 nskb = cpu_dp->rcv(skb, dev, pt);
242 if (!nskb) {
243 kfree_skb(skb);
244 return 0;
245 }
246
247 skb = nskb;
248 skb_push(skb, ETH_HLEN);
249 skb->pkt_type = PACKET_HOST;
250 skb->protocol = eth_type_trans(skb, skb->dev);
251
252 if (unlikely(!dsa_slave_dev_check(skb->dev))) {
253 /* Packet is to be injected directly on an upper
254 * device, e.g. a team/bond, so skip all DSA-port
255 * specific actions.
256 */
257 netif_rx(skb);
258 return 0;
259 }
260
261 p = netdev_priv(skb->dev);
262
263 if (unlikely(cpu_dp->ds->untag_bridge_pvid)) {
264 nskb = dsa_untag_bridge_pvid(skb);
265 if (!nskb) {
266 kfree_skb(skb);
267 return 0;
268 }
269 skb = nskb;
270 }
271
272 dev_sw_netstats_rx_add(skb->dev, skb->len);
273
274 if (dsa_skb_defer_rx_timestamp(p, skb))
275 return 0;
276
277 gro_cells_receive(&p->gcells, skb);
278
279 return 0;
280}
281
282#ifdef CONFIG_PM_SLEEP
283static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
284{
285 const struct dsa_port *dp = dsa_to_port(ds, p);
286
287 return dp->type == DSA_PORT_TYPE_USER && dp->slave;
288}
289
290int dsa_switch_suspend(struct dsa_switch *ds)
291{
292 int i, ret = 0;
293
294 /* Suspend slave network devices */
295 for (i = 0; i < ds->num_ports; i++) {
296 if (!dsa_is_port_initialized(ds, i))
297 continue;
298
299 ret = dsa_slave_suspend(dsa_to_port(ds, i)->slave);
300 if (ret)
301 return ret;
302 }
303
304 if (ds->ops->suspend)
305 ret = ds->ops->suspend(ds);
306
307 return ret;
308}
309EXPORT_SYMBOL_GPL(dsa_switch_suspend);
310
311int dsa_switch_resume(struct dsa_switch *ds)
312{
313 int i, ret = 0;
314
315 if (ds->ops->resume)
316 ret = ds->ops->resume(ds);
317
318 if (ret)
319 return ret;
320
321 /* Resume slave network devices */
322 for (i = 0; i < ds->num_ports; i++) {
323 if (!dsa_is_port_initialized(ds, i))
324 continue;
325
326 ret = dsa_slave_resume(dsa_to_port(ds, i)->slave);
327 if (ret)
328 return ret;
329 }
330
331 return 0;
332}
333EXPORT_SYMBOL_GPL(dsa_switch_resume);
334#endif
335
336static struct packet_type dsa_pack_type __read_mostly = {
337 .type = cpu_to_be16(ETH_P_XDSA),
338 .func = dsa_switch_rcv,
339};
340
341static struct workqueue_struct *dsa_owq;
342
343bool dsa_schedule_work(struct work_struct *work)
344{
345 return queue_work(dsa_owq, work);
346}
347
348void dsa_flush_workqueue(void)
349{
350 flush_workqueue(dsa_owq);
351}
352
353int dsa_devlink_param_get(struct devlink *dl, u32 id,
354 struct devlink_param_gset_ctx *ctx)
355{
356 struct dsa_switch *ds = dsa_devlink_to_ds(dl);
357
358 if (!ds->ops->devlink_param_get)
359 return -EOPNOTSUPP;
360
361 return ds->ops->devlink_param_get(ds, id, ctx);
362}
363EXPORT_SYMBOL_GPL(dsa_devlink_param_get);
364
365int dsa_devlink_param_set(struct devlink *dl, u32 id,
366 struct devlink_param_gset_ctx *ctx)
367{
368 struct dsa_switch *ds = dsa_devlink_to_ds(dl);
369
370 if (!ds->ops->devlink_param_set)
371 return -EOPNOTSUPP;
372
373 return ds->ops->devlink_param_set(ds, id, ctx);
374}
375EXPORT_SYMBOL_GPL(dsa_devlink_param_set);
376
377int dsa_devlink_params_register(struct dsa_switch *ds,
378 const struct devlink_param *params,
379 size_t params_count)
380{
381 return devlink_params_register(ds->devlink, params, params_count);
382}
383EXPORT_SYMBOL_GPL(dsa_devlink_params_register);
384
385void dsa_devlink_params_unregister(struct dsa_switch *ds,
386 const struct devlink_param *params,
387 size_t params_count)
388{
389 devlink_params_unregister(ds->devlink, params, params_count);
390}
391EXPORT_SYMBOL_GPL(dsa_devlink_params_unregister);
392
393int dsa_devlink_resource_register(struct dsa_switch *ds,
394 const char *resource_name,
395 u64 resource_size,
396 u64 resource_id,
397 u64 parent_resource_id,
398 const struct devlink_resource_size_params *size_params)
399{
400 return devlink_resource_register(ds->devlink, resource_name,
401 resource_size, resource_id,
402 parent_resource_id,
403 size_params);
404}
405EXPORT_SYMBOL_GPL(dsa_devlink_resource_register);
406
407void dsa_devlink_resources_unregister(struct dsa_switch *ds)
408{
409 devlink_resources_unregister(ds->devlink, NULL);
410}
411EXPORT_SYMBOL_GPL(dsa_devlink_resources_unregister);
412
413void dsa_devlink_resource_occ_get_register(struct dsa_switch *ds,
414 u64 resource_id,
415 devlink_resource_occ_get_t *occ_get,
416 void *occ_get_priv)
417{
418 return devlink_resource_occ_get_register(ds->devlink, resource_id,
419 occ_get, occ_get_priv);
420}
421EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_register);
422
423void dsa_devlink_resource_occ_get_unregister(struct dsa_switch *ds,
424 u64 resource_id)
425{
426 devlink_resource_occ_get_unregister(ds->devlink, resource_id);
427}
428EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_unregister);
429
430struct devlink_region *
431dsa_devlink_region_create(struct dsa_switch *ds,
432 const struct devlink_region_ops *ops,
433 u32 region_max_snapshots, u64 region_size)
434{
435 return devlink_region_create(ds->devlink, ops, region_max_snapshots,
436 region_size);
437}
438EXPORT_SYMBOL_GPL(dsa_devlink_region_create);
439
440struct devlink_region *
441dsa_devlink_port_region_create(struct dsa_switch *ds,
442 int port,
443 const struct devlink_port_region_ops *ops,
444 u32 region_max_snapshots, u64 region_size)
445{
446 struct dsa_port *dp = dsa_to_port(ds, port);
447
448 return devlink_port_region_create(&dp->devlink_port, ops,
449 region_max_snapshots,
450 region_size);
451}
452EXPORT_SYMBOL_GPL(dsa_devlink_port_region_create);
453
454void dsa_devlink_region_destroy(struct devlink_region *region)
455{
456 devlink_region_destroy(region);
457}
458EXPORT_SYMBOL_GPL(dsa_devlink_region_destroy);
459
460struct dsa_port *dsa_port_from_netdev(struct net_device *netdev)
461{
462 if (!netdev || !dsa_slave_dev_check(netdev))
463 return ERR_PTR(-ENODEV);
464
465 return dsa_slave_to_port(netdev);
466}
467EXPORT_SYMBOL_GPL(dsa_port_from_netdev);
468
469static int __init dsa_init_module(void)
470{
471 int rc;
472
473 dsa_owq = alloc_ordered_workqueue("dsa_ordered",
474 WQ_MEM_RECLAIM);
475 if (!dsa_owq)
476 return -ENOMEM;
477
478 rc = dsa_slave_register_notifier();
479 if (rc)
480 goto register_notifier_fail;
481
482 dev_add_pack(&dsa_pack_type);
483
484 dsa_tag_driver_register(&DSA_TAG_DRIVER_NAME(none_ops),
485 THIS_MODULE);
486
487 return 0;
488
489register_notifier_fail:
490 destroy_workqueue(dsa_owq);
491
492 return rc;
493}
494module_init(dsa_init_module);
495
496static void __exit dsa_cleanup_module(void)
497{
498 dsa_tag_driver_unregister(&DSA_TAG_DRIVER_NAME(none_ops));
499
500 dsa_slave_unregister_notifier();
501 dev_remove_pack(&dsa_pack_type);
502 destroy_workqueue(dsa_owq);
503}
504module_exit(dsa_cleanup_module);
505
506MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
507MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
508MODULE_LICENSE("GPL");
509MODULE_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");