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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
91da11f8 LB |
2 | /* |
3 | * net/dsa/dsa.c - Hardware switch handling | |
e84665c9 | 4 | * Copyright (c) 2008-2009 Marvell Semiconductor |
5e95329b | 5 | * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org> |
91da11f8 LB |
6 | */ |
7 | ||
51579c3f | 8 | #include <linux/device.h> |
91da11f8 | 9 | #include <linux/list.h> |
91da11f8 | 10 | #include <linux/platform_device.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
3a9a231d | 12 | #include <linux/module.h> |
60724d4b | 13 | #include <linux/notifier.h> |
5e95329b FF |
14 | #include <linux/of.h> |
15 | #include <linux/of_mdio.h> | |
16 | #include <linux/of_platform.h> | |
769a0202 | 17 | #include <linux/of_net.h> |
c6e970a0 | 18 | #include <linux/netdevice.h> |
51579c3f | 19 | #include <linux/sysfs.h> |
cbc5d90b | 20 | #include <linux/phy_fixed.h> |
90af1059 | 21 | #include <linux/ptp_classify.h> |
a86d8bec | 22 | #include <linux/etherdevice.h> |
ea5dd34b | 23 | |
91da11f8 LB |
24 | #include "dsa_priv.h" |
25 | ||
bdc6fe5b AL |
26 | static LIST_HEAD(dsa_tag_drivers_list); |
27 | static DEFINE_MUTEX(dsa_tag_drivers_lock); | |
28 | ||
39a7f2a4 AL |
29 | static 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 | ||
36 | static const struct dsa_device_ops none_ops = { | |
875138f8 | 37 | .name = "none", |
056eed2f | 38 | .proto = DSA_TAG_PROTO_NONE, |
39a7f2a4 AL |
39 | .xmit = dsa_slave_notag_xmit, |
40 | .rcv = NULL, | |
41 | }; | |
42 | ||
409065b0 AL |
43 | DSA_TAG_DRIVER(none_ops); |
44 | ||
bdc6fe5b AL |
45 | static 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 | ||
d3b8c049 AL |
55 | void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[], |
56 | unsigned int count, struct module *owner) | |
57 | { | |
bdc6fe5b AL |
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 | ||
64 | static 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); | |
d3b8c049 AL |
69 | } |
70 | EXPORT_SYMBOL_GPL(dsa_tag_drivers_register); | |
71 | ||
72 | void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[], | |
73 | unsigned int count) | |
74 | { | |
bdc6fe5b AL |
75 | unsigned int i; |
76 | ||
77 | for (i = 0; i < count; i++) | |
78 | dsa_tag_driver_unregister(dsa_tag_driver_array[i]); | |
d3b8c049 AL |
79 | } |
80 | EXPORT_SYMBOL_GPL(dsa_tag_drivers_unregister); | |
81 | ||
98cdb480 FF |
82 | const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops) |
83 | { | |
875138f8 | 84 | return ops->name; |
98cdb480 FF |
85 | }; |
86 | ||
53da0eba VO |
87 | /* Function takes a reference on the module owning the tagger, |
88 | * so dsa_tag_driver_put must be called afterwards. | |
89 | */ | |
90 | const 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 | ||
c39e2a1d | 113 | const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol) |
39a7f2a4 | 114 | { |
36756175 | 115 | struct dsa_tag_driver *dsa_tag_driver; |
39a7f2a4 | 116 | const struct dsa_device_ops *ops; |
36756175 | 117 | bool found = false; |
39a7f2a4 | 118 | |
ee91a83e | 119 | request_module("%s%d", DSA_TAG_DRIVER_ALIAS, tag_protocol); |
36756175 AL |
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); | |
39a7f2a4 AL |
138 | |
139 | return ops; | |
140 | } | |
141 | ||
4dad81ee AL |
142 | void dsa_tag_driver_put(const struct dsa_device_ops *ops) |
143 | { | |
36756175 AL |
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); | |
4dad81ee AL |
154 | } |
155 | ||
91da11f8 LB |
156 | static 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 | ||
164 | static 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 | ||
14b89f36 | 174 | struct net_device *dsa_dev_to_net_device(struct device *dev) |
91da11f8 LB |
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 | } | |
14b89f36 | 191 | EXPORT_SYMBOL_GPL(dsa_dev_to_net_device); |
91da11f8 | 192 | |
90af1059 BS |
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 | */ | |
201 | static 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 | ||
3e8a72d1 | 225 | static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev, |
89e49506 | 226 | struct packet_type *pt, struct net_device *unused) |
3e8a72d1 | 227 | { |
2f657a60 | 228 | struct dsa_port *cpu_dp = dev->dsa_ptr; |
a86d8bec | 229 | struct sk_buff *nskb = NULL; |
f613ed66 | 230 | struct dsa_slave_priv *p; |
3e8a72d1 | 231 | |
2f657a60 | 232 | if (unlikely(!cpu_dp)) { |
3e8a72d1 FF |
233 | kfree_skb(skb); |
234 | return 0; | |
235 | } | |
236 | ||
16c5dcb1 FF |
237 | skb = skb_unshare(skb, GFP_ATOMIC); |
238 | if (!skb) | |
239 | return 0; | |
240 | ||
29a097b7 | 241 | nskb = cpu_dp->rcv(skb, dev); |
a86d8bec FF |
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 | ||
5b60dadb TW |
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 | ||
1dc0408c FF |
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 | ||
6a900628 | 272 | dev_sw_netstats_rx_add(skb->dev, skb->len); |
a86d8bec | 273 | |
90af1059 BS |
274 | if (dsa_skb_defer_rx_timestamp(p, skb)) |
275 | return 0; | |
276 | ||
e131a563 | 277 | gro_cells_receive(&p->gcells, skb); |
a86d8bec FF |
278 | |
279 | return 0; | |
3e8a72d1 FF |
280 | } |
281 | ||
ac2629a4 | 282 | #ifdef CONFIG_PM_SLEEP |
e7d53ad3 VD |
283 | static bool dsa_is_port_initialized(struct dsa_switch *ds, int p) |
284 | { | |
68bb8ea8 VD |
285 | const struct dsa_port *dp = dsa_to_port(ds, p); |
286 | ||
287 | return dp->type == DSA_PORT_TYPE_USER && dp->slave; | |
e7d53ad3 VD |
288 | } |
289 | ||
ac2629a4 FF |
290 | int 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 | ||
68bb8ea8 | 299 | ret = dsa_slave_suspend(dsa_to_port(ds, i)->slave); |
ac2629a4 FF |
300 | if (ret) |
301 | return ret; | |
302 | } | |
303 | ||
304 | if (ds->ops->suspend) | |
305 | ret = ds->ops->suspend(ds); | |
306 | ||
307 | return ret; | |
308 | } | |
309 | EXPORT_SYMBOL_GPL(dsa_switch_suspend); | |
310 | ||
311 | int 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 | ||
68bb8ea8 | 326 | ret = dsa_slave_resume(dsa_to_port(ds, i)->slave); |
ac2629a4 FF |
327 | if (ret) |
328 | return ret; | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(dsa_switch_resume); | |
334 | #endif | |
335 | ||
61b7363f | 336 | static struct packet_type dsa_pack_type __read_mostly = { |
3e8a72d1 FF |
337 | .type = cpu_to_be16(ETH_P_XDSA), |
338 | .func = dsa_switch_rcv, | |
339 | }; | |
340 | ||
c9eb3e0f AS |
341 | static struct workqueue_struct *dsa_owq; |
342 | ||
343 | bool dsa_schedule_work(struct work_struct *work) | |
344 | { | |
345 | return queue_work(dsa_owq, work); | |
346 | } | |
347 | ||
a57d8c21 VO |
348 | void dsa_flush_workqueue(void) |
349 | { | |
350 | flush_workqueue(dsa_owq); | |
351 | } | |
352 | ||
6b297524 AL |
353 | int dsa_devlink_param_get(struct devlink *dl, u32 id, |
354 | struct devlink_param_gset_ctx *ctx) | |
355 | { | |
ccc3e6b0 | 356 | struct dsa_switch *ds = dsa_devlink_to_ds(dl); |
6b297524 AL |
357 | |
358 | if (!ds->ops->devlink_param_get) | |
359 | return -EOPNOTSUPP; | |
360 | ||
361 | return ds->ops->devlink_param_get(ds, id, ctx); | |
362 | } | |
363 | EXPORT_SYMBOL_GPL(dsa_devlink_param_get); | |
364 | ||
365 | int dsa_devlink_param_set(struct devlink *dl, u32 id, | |
366 | struct devlink_param_gset_ctx *ctx) | |
367 | { | |
ccc3e6b0 | 368 | struct dsa_switch *ds = dsa_devlink_to_ds(dl); |
6b297524 AL |
369 | |
370 | if (!ds->ops->devlink_param_set) | |
371 | return -EOPNOTSUPP; | |
372 | ||
373 | return ds->ops->devlink_param_set(ds, id, ctx); | |
374 | } | |
375 | EXPORT_SYMBOL_GPL(dsa_devlink_param_set); | |
376 | ||
377 | int 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 | } | |
383 | EXPORT_SYMBOL_GPL(dsa_devlink_params_register); | |
384 | ||
385 | void 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 | } | |
391 | EXPORT_SYMBOL_GPL(dsa_devlink_params_unregister); | |
392 | ||
5cd73fbd AL |
393 | int 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 | } | |
405 | EXPORT_SYMBOL_GPL(dsa_devlink_resource_register); | |
406 | ||
407 | void dsa_devlink_resources_unregister(struct dsa_switch *ds) | |
408 | { | |
409 | devlink_resources_unregister(ds->devlink, NULL); | |
410 | } | |
411 | EXPORT_SYMBOL_GPL(dsa_devlink_resources_unregister); | |
412 | ||
413 | void 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 | } | |
421 | EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_register); | |
422 | ||
423 | void 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 | } | |
428 | EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_unregister); | |
429 | ||
97c82c23 AL |
430 | struct devlink_region * |
431 | dsa_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 | } | |
438 | EXPORT_SYMBOL_GPL(dsa_devlink_region_create); | |
439 | ||
08156ba4 AL |
440 | struct devlink_region * |
441 | dsa_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 | } | |
452 | EXPORT_SYMBOL_GPL(dsa_devlink_port_region_create); | |
453 | ||
97c82c23 AL |
454 | void dsa_devlink_region_destroy(struct devlink_region *region) |
455 | { | |
456 | devlink_region_destroy(region); | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(dsa_devlink_region_destroy); | |
459 | ||
e1eea811 VO |
460 | struct 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 | } | |
467 | EXPORT_SYMBOL_GPL(dsa_port_from_netdev); | |
468 | ||
91da11f8 LB |
469 | static int __init dsa_init_module(void) |
470 | { | |
7df899c3 BH |
471 | int rc; |
472 | ||
c9eb3e0f AS |
473 | dsa_owq = alloc_ordered_workqueue("dsa_ordered", |
474 | WQ_MEM_RECLAIM); | |
475 | if (!dsa_owq) | |
476 | return -ENOMEM; | |
477 | ||
88e4f0ca VD |
478 | rc = dsa_slave_register_notifier(); |
479 | if (rc) | |
68be9302 | 480 | goto register_notifier_fail; |
b73adef6 | 481 | |
3e8a72d1 FF |
482 | dev_add_pack(&dsa_pack_type); |
483 | ||
409065b0 AL |
484 | dsa_tag_driver_register(&DSA_TAG_DRIVER_NAME(none_ops), |
485 | THIS_MODULE); | |
486 | ||
7df899c3 | 487 | return 0; |
68be9302 | 488 | |
68be9302 Y |
489 | register_notifier_fail: |
490 | destroy_workqueue(dsa_owq); | |
491 | ||
492 | return rc; | |
91da11f8 LB |
493 | } |
494 | module_init(dsa_init_module); | |
495 | ||
496 | static void __exit dsa_cleanup_module(void) | |
497 | { | |
409065b0 AL |
498 | dsa_tag_driver_unregister(&DSA_TAG_DRIVER_NAME(none_ops)); |
499 | ||
88e4f0ca | 500 | dsa_slave_unregister_notifier(); |
3e8a72d1 | 501 | dev_remove_pack(&dsa_pack_type); |
c9eb3e0f | 502 | destroy_workqueue(dsa_owq); |
91da11f8 LB |
503 | } |
504 | module_exit(dsa_cleanup_module); | |
505 | ||
577d6a7c | 506 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>"); |
91da11f8 LB |
507 | MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips"); |
508 | MODULE_LICENSE("GPL"); | |
509 | MODULE_ALIAS("platform:dsa"); |