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// 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");