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83c0afae AL |
1 | /* |
2 | * net/dsa/dsa2.c - Hardware switch handling, binding version 2 | |
3 | * Copyright (c) 2008-2009 Marvell Semiconductor | |
4 | * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org> | |
5 | * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/device.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/list.h> | |
c6e970a0 | 16 | #include <linux/netdevice.h> |
83c0afae AL |
17 | #include <linux/slab.h> |
18 | #include <linux/rtnetlink.h> | |
83c0afae AL |
19 | #include <linux/of.h> |
20 | #include <linux/of_net.h> | |
ea5dd34b | 21 | |
83c0afae AL |
22 | #include "dsa_priv.h" |
23 | ||
24 | static LIST_HEAD(dsa_switch_trees); | |
25 | static DEFINE_MUTEX(dsa2_mutex); | |
26 | ||
96567d5d AL |
27 | static const struct devlink_ops dsa_devlink_ops = { |
28 | }; | |
29 | ||
83c0afae AL |
30 | static struct dsa_switch_tree *dsa_get_dst(u32 tree) |
31 | { | |
32 | struct dsa_switch_tree *dst; | |
33 | ||
34 | list_for_each_entry(dst, &dsa_switch_trees, list) | |
7a99cd6e NY |
35 | if (dst->tree == tree) { |
36 | kref_get(&dst->refcount); | |
83c0afae | 37 | return dst; |
7a99cd6e | 38 | } |
83c0afae AL |
39 | return NULL; |
40 | } | |
41 | ||
42 | static void dsa_free_dst(struct kref *ref) | |
43 | { | |
44 | struct dsa_switch_tree *dst = container_of(ref, struct dsa_switch_tree, | |
45 | refcount); | |
46 | ||
47 | list_del(&dst->list); | |
48 | kfree(dst); | |
49 | } | |
50 | ||
51 | static void dsa_put_dst(struct dsa_switch_tree *dst) | |
52 | { | |
53 | kref_put(&dst->refcount, dsa_free_dst); | |
54 | } | |
55 | ||
56 | static struct dsa_switch_tree *dsa_add_dst(u32 tree) | |
57 | { | |
58 | struct dsa_switch_tree *dst; | |
59 | ||
60 | dst = kzalloc(sizeof(*dst), GFP_KERNEL); | |
61 | if (!dst) | |
62 | return NULL; | |
63 | dst->tree = tree; | |
83c0afae AL |
64 | INIT_LIST_HEAD(&dst->list); |
65 | list_add_tail(&dsa_switch_trees, &dst->list); | |
66 | kref_init(&dst->refcount); | |
67 | ||
68 | return dst; | |
69 | } | |
70 | ||
71 | static void dsa_dst_add_ds(struct dsa_switch_tree *dst, | |
72 | struct dsa_switch *ds, u32 index) | |
73 | { | |
74 | kref_get(&dst->refcount); | |
75 | dst->ds[index] = ds; | |
76 | } | |
77 | ||
78 | static void dsa_dst_del_ds(struct dsa_switch_tree *dst, | |
79 | struct dsa_switch *ds, u32 index) | |
80 | { | |
81 | dst->ds[index] = NULL; | |
82 | kref_put(&dst->refcount, dsa_free_dst); | |
83 | } | |
84 | ||
71e0bbde FF |
85 | /* For platform data configurations, we need to have a valid name argument to |
86 | * differentiate a disabled port from an enabled one | |
87 | */ | |
293784a8 | 88 | static bool dsa_port_is_valid(struct dsa_port *port) |
83c0afae | 89 | { |
71e0bbde | 90 | return !!(port->dn || port->name); |
83c0afae AL |
91 | } |
92 | ||
293784a8 | 93 | static bool dsa_port_is_dsa(struct dsa_port *port) |
83c0afae | 94 | { |
71e0bbde FF |
95 | if (port->name && !strcmp(port->name, "dsa")) |
96 | return true; | |
97 | else | |
98 | return !!of_parse_phandle(port->dn, "link", 0); | |
293784a8 FF |
99 | } |
100 | ||
101 | static bool dsa_port_is_cpu(struct dsa_port *port) | |
102 | { | |
71e0bbde FF |
103 | if (port->name && !strcmp(port->name, "cpu")) |
104 | return true; | |
105 | else | |
106 | return !!of_parse_phandle(port->dn, "ethernet", 0); | |
83c0afae AL |
107 | } |
108 | ||
3512a8e9 FF |
109 | static bool dsa_ds_find_port_dn(struct dsa_switch *ds, |
110 | struct device_node *port) | |
83c0afae AL |
111 | { |
112 | u32 index; | |
113 | ||
26895e29 | 114 | for (index = 0; index < ds->num_ports; index++) |
83c0afae AL |
115 | if (ds->ports[index].dn == port) |
116 | return true; | |
117 | return false; | |
118 | } | |
119 | ||
3512a8e9 FF |
120 | static struct dsa_switch *dsa_dst_find_port_dn(struct dsa_switch_tree *dst, |
121 | struct device_node *port) | |
83c0afae AL |
122 | { |
123 | struct dsa_switch *ds; | |
124 | u32 index; | |
125 | ||
126 | for (index = 0; index < DSA_MAX_SWITCHES; index++) { | |
127 | ds = dst->ds[index]; | |
128 | if (!ds) | |
129 | continue; | |
130 | ||
3512a8e9 | 131 | if (dsa_ds_find_port_dn(ds, port)) |
83c0afae AL |
132 | return ds; |
133 | } | |
134 | ||
135 | return NULL; | |
136 | } | |
137 | ||
138 | static int dsa_port_complete(struct dsa_switch_tree *dst, | |
139 | struct dsa_switch *src_ds, | |
293784a8 | 140 | struct dsa_port *port, |
83c0afae AL |
141 | u32 src_port) |
142 | { | |
143 | struct device_node *link; | |
144 | int index; | |
145 | struct dsa_switch *dst_ds; | |
146 | ||
147 | for (index = 0;; index++) { | |
293784a8 | 148 | link = of_parse_phandle(port->dn, "link", index); |
83c0afae AL |
149 | if (!link) |
150 | break; | |
151 | ||
3512a8e9 | 152 | dst_ds = dsa_dst_find_port_dn(dst, link); |
83c0afae AL |
153 | of_node_put(link); |
154 | ||
155 | if (!dst_ds) | |
156 | return 1; | |
157 | ||
158 | src_ds->rtable[dst_ds->index] = src_port; | |
159 | } | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | /* A switch is complete if all the DSA ports phandles point to ports | |
165 | * known in the tree. A return value of 1 means the tree is not | |
166 | * complete. This is not an error condition. A value of 0 is | |
167 | * success. | |
168 | */ | |
169 | static int dsa_ds_complete(struct dsa_switch_tree *dst, struct dsa_switch *ds) | |
170 | { | |
293784a8 | 171 | struct dsa_port *port; |
83c0afae AL |
172 | u32 index; |
173 | int err; | |
174 | ||
26895e29 | 175 | for (index = 0; index < ds->num_ports; index++) { |
293784a8 FF |
176 | port = &ds->ports[index]; |
177 | if (!dsa_port_is_valid(port)) | |
83c0afae AL |
178 | continue; |
179 | ||
180 | if (!dsa_port_is_dsa(port)) | |
181 | continue; | |
182 | ||
183 | err = dsa_port_complete(dst, ds, port, index); | |
184 | if (err != 0) | |
185 | return err; | |
186 | ||
187 | ds->dsa_port_mask |= BIT(index); | |
188 | } | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | /* A tree is complete if all the DSA ports phandles point to ports | |
194 | * known in the tree. A return value of 1 means the tree is not | |
195 | * complete. This is not an error condition. A value of 0 is | |
196 | * success. | |
197 | */ | |
198 | static int dsa_dst_complete(struct dsa_switch_tree *dst) | |
199 | { | |
200 | struct dsa_switch *ds; | |
201 | u32 index; | |
202 | int err; | |
203 | ||
204 | for (index = 0; index < DSA_MAX_SWITCHES; index++) { | |
205 | ds = dst->ds[index]; | |
206 | if (!ds) | |
207 | continue; | |
208 | ||
209 | err = dsa_ds_complete(dst, ds); | |
210 | if (err != 0) | |
211 | return err; | |
212 | } | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
293784a8 | 217 | static int dsa_dsa_port_apply(struct dsa_port *port, u32 index, |
83c0afae AL |
218 | struct dsa_switch *ds) |
219 | { | |
220 | int err; | |
221 | ||
222 | err = dsa_cpu_dsa_setup(ds, ds->dev, port, index); | |
223 | if (err) { | |
224 | dev_warn(ds->dev, "Failed to setup dsa port %d: %d\n", | |
225 | index, err); | |
226 | return err; | |
227 | } | |
228 | ||
96567d5d AL |
229 | memset(&ds->ports[index].devlink_port, 0, |
230 | sizeof(ds->ports[index].devlink_port)); | |
231 | ||
232 | return devlink_port_register(ds->devlink, | |
233 | &ds->ports[index].devlink_port, | |
234 | index); | |
83c0afae AL |
235 | } |
236 | ||
293784a8 | 237 | static void dsa_dsa_port_unapply(struct dsa_port *port, u32 index, |
83c0afae AL |
238 | struct dsa_switch *ds) |
239 | { | |
96567d5d | 240 | devlink_port_unregister(&ds->ports[index].devlink_port); |
83c0afae AL |
241 | dsa_cpu_dsa_destroy(port); |
242 | } | |
243 | ||
293784a8 | 244 | static int dsa_cpu_port_apply(struct dsa_port *port, u32 index, |
83c0afae AL |
245 | struct dsa_switch *ds) |
246 | { | |
247 | int err; | |
248 | ||
249 | err = dsa_cpu_dsa_setup(ds, ds->dev, port, index); | |
250 | if (err) { | |
251 | dev_warn(ds->dev, "Failed to setup cpu port %d: %d\n", | |
252 | index, err); | |
253 | return err; | |
254 | } | |
255 | ||
256 | ds->cpu_port_mask |= BIT(index); | |
257 | ||
96567d5d AL |
258 | memset(&ds->ports[index].devlink_port, 0, |
259 | sizeof(ds->ports[index].devlink_port)); | |
260 | err = devlink_port_register(ds->devlink, &ds->ports[index].devlink_port, | |
261 | index); | |
262 | return err; | |
83c0afae AL |
263 | } |
264 | ||
293784a8 | 265 | static void dsa_cpu_port_unapply(struct dsa_port *port, u32 index, |
83c0afae AL |
266 | struct dsa_switch *ds) |
267 | { | |
96567d5d | 268 | devlink_port_unregister(&ds->ports[index].devlink_port); |
83c0afae AL |
269 | dsa_cpu_dsa_destroy(port); |
270 | ds->cpu_port_mask &= ~BIT(index); | |
271 | ||
272 | } | |
273 | ||
293784a8 | 274 | static int dsa_user_port_apply(struct dsa_port *port, u32 index, |
83c0afae AL |
275 | struct dsa_switch *ds) |
276 | { | |
71e0bbde | 277 | const char *name = port->name; |
83c0afae AL |
278 | int err; |
279 | ||
71e0bbde FF |
280 | if (port->dn) |
281 | name = of_get_property(port->dn, "label", NULL); | |
9f91484f VD |
282 | if (!name) |
283 | name = "eth%d"; | |
83c0afae AL |
284 | |
285 | err = dsa_slave_create(ds, ds->dev, index, name); | |
286 | if (err) { | |
287 | dev_warn(ds->dev, "Failed to create slave %d: %d\n", | |
288 | index, err); | |
382e1eea | 289 | ds->ports[index].netdev = NULL; |
83c0afae AL |
290 | return err; |
291 | } | |
292 | ||
96567d5d AL |
293 | memset(&ds->ports[index].devlink_port, 0, |
294 | sizeof(ds->ports[index].devlink_port)); | |
295 | err = devlink_port_register(ds->devlink, &ds->ports[index].devlink_port, | |
296 | index); | |
297 | if (err) | |
298 | return err; | |
299 | ||
300 | devlink_port_type_eth_set(&ds->ports[index].devlink_port, | |
301 | ds->ports[index].netdev); | |
302 | ||
83c0afae AL |
303 | return 0; |
304 | } | |
305 | ||
293784a8 | 306 | static void dsa_user_port_unapply(struct dsa_port *port, u32 index, |
83c0afae AL |
307 | struct dsa_switch *ds) |
308 | { | |
96567d5d | 309 | devlink_port_unregister(&ds->ports[index].devlink_port); |
83c0afae AL |
310 | if (ds->ports[index].netdev) { |
311 | dsa_slave_destroy(ds->ports[index].netdev); | |
312 | ds->ports[index].netdev = NULL; | |
6e830d8f | 313 | ds->enabled_port_mask &= ~(1 << index); |
83c0afae AL |
314 | } |
315 | } | |
316 | ||
317 | static int dsa_ds_apply(struct dsa_switch_tree *dst, struct dsa_switch *ds) | |
318 | { | |
293784a8 | 319 | struct dsa_port *port; |
83c0afae AL |
320 | u32 index; |
321 | int err; | |
322 | ||
6e830d8f | 323 | /* Initialize ds->phys_mii_mask before registering the slave MDIO bus |
9d490b4e | 324 | * driver and before ops->setup() has run, since the switch drivers and |
6e830d8f FF |
325 | * the slave MDIO bus driver rely on these values for probing PHY |
326 | * devices or not | |
327 | */ | |
328 | ds->phys_mii_mask = ds->enabled_port_mask; | |
329 | ||
96567d5d AL |
330 | /* Add the switch to devlink before calling setup, so that setup can |
331 | * add dpipe tables | |
332 | */ | |
333 | ds->devlink = devlink_alloc(&dsa_devlink_ops, 0); | |
334 | if (!ds->devlink) | |
335 | return -ENOMEM; | |
336 | ||
337 | err = devlink_register(ds->devlink, ds->dev); | |
338 | if (err) | |
339 | return err; | |
340 | ||
9d490b4e | 341 | err = ds->ops->setup(ds); |
83c0afae AL |
342 | if (err < 0) |
343 | return err; | |
344 | ||
f515f192 VD |
345 | err = dsa_switch_register_notifier(ds); |
346 | if (err) | |
347 | return err; | |
348 | ||
092183df JC |
349 | if (ds->ops->set_addr) { |
350 | err = ds->ops->set_addr(ds, dst->master_netdev->dev_addr); | |
351 | if (err < 0) | |
352 | return err; | |
353 | } | |
83c0afae | 354 | |
9d490b4e | 355 | if (!ds->slave_mii_bus && ds->ops->phy_read) { |
1eb59443 FF |
356 | ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev); |
357 | if (!ds->slave_mii_bus) | |
358 | return -ENOMEM; | |
359 | ||
360 | dsa_slave_mii_bus_init(ds); | |
361 | ||
362 | err = mdiobus_register(ds->slave_mii_bus); | |
363 | if (err < 0) | |
364 | return err; | |
365 | } | |
366 | ||
26895e29 | 367 | for (index = 0; index < ds->num_ports; index++) { |
293784a8 FF |
368 | port = &ds->ports[index]; |
369 | if (!dsa_port_is_valid(port)) | |
83c0afae AL |
370 | continue; |
371 | ||
372 | if (dsa_port_is_dsa(port)) { | |
373 | err = dsa_dsa_port_apply(port, index, ds); | |
374 | if (err) | |
375 | return err; | |
376 | continue; | |
377 | } | |
378 | ||
379 | if (dsa_port_is_cpu(port)) { | |
380 | err = dsa_cpu_port_apply(port, index, ds); | |
381 | if (err) | |
382 | return err; | |
383 | continue; | |
384 | } | |
385 | ||
386 | err = dsa_user_port_apply(port, index, ds); | |
387 | if (err) | |
388 | continue; | |
389 | } | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
394 | static void dsa_ds_unapply(struct dsa_switch_tree *dst, struct dsa_switch *ds) | |
395 | { | |
293784a8 | 396 | struct dsa_port *port; |
83c0afae AL |
397 | u32 index; |
398 | ||
26895e29 | 399 | for (index = 0; index < ds->num_ports; index++) { |
293784a8 FF |
400 | port = &ds->ports[index]; |
401 | if (!dsa_port_is_valid(port)) | |
83c0afae AL |
402 | continue; |
403 | ||
404 | if (dsa_port_is_dsa(port)) { | |
405 | dsa_dsa_port_unapply(port, index, ds); | |
406 | continue; | |
407 | } | |
408 | ||
409 | if (dsa_port_is_cpu(port)) { | |
410 | dsa_cpu_port_unapply(port, index, ds); | |
411 | continue; | |
412 | } | |
413 | ||
414 | dsa_user_port_unapply(port, index, ds); | |
415 | } | |
1eb59443 | 416 | |
9d490b4e | 417 | if (ds->slave_mii_bus && ds->ops->phy_read) |
1eb59443 | 418 | mdiobus_unregister(ds->slave_mii_bus); |
f515f192 VD |
419 | |
420 | dsa_switch_unregister_notifier(ds); | |
96567d5d AL |
421 | |
422 | if (ds->devlink) { | |
423 | devlink_unregister(ds->devlink); | |
424 | devlink_free(ds->devlink); | |
425 | ds->devlink = NULL; | |
426 | } | |
427 | ||
83c0afae AL |
428 | } |
429 | ||
430 | static int dsa_dst_apply(struct dsa_switch_tree *dst) | |
431 | { | |
432 | struct dsa_switch *ds; | |
433 | u32 index; | |
434 | int err; | |
435 | ||
436 | for (index = 0; index < DSA_MAX_SWITCHES; index++) { | |
437 | ds = dst->ds[index]; | |
438 | if (!ds) | |
439 | continue; | |
440 | ||
441 | err = dsa_ds_apply(dst, ds); | |
442 | if (err) | |
443 | return err; | |
444 | } | |
445 | ||
8b0d3ea5 VD |
446 | if (dst->cpu_dp) { |
447 | err = dsa_cpu_port_ethtool_setup(dst->cpu_dp->ds); | |
faf3a932 FF |
448 | if (err) |
449 | return err; | |
450 | } | |
0c73c523 | 451 | |
83c0afae AL |
452 | /* If we use a tagging format that doesn't have an ethertype |
453 | * field, make sure that all packets from this point on get | |
454 | * sent to the tag format's receive function. | |
455 | */ | |
456 | wmb(); | |
457 | dst->master_netdev->dsa_ptr = (void *)dst; | |
458 | dst->applied = true; | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | static void dsa_dst_unapply(struct dsa_switch_tree *dst) | |
464 | { | |
465 | struct dsa_switch *ds; | |
466 | u32 index; | |
467 | ||
468 | if (!dst->applied) | |
469 | return; | |
470 | ||
471 | dst->master_netdev->dsa_ptr = NULL; | |
472 | ||
473 | /* If we used a tagging format that doesn't have an ethertype | |
474 | * field, make sure that all packets from this point get sent | |
475 | * without the tag and go through the regular receive path. | |
476 | */ | |
477 | wmb(); | |
478 | ||
479 | for (index = 0; index < DSA_MAX_SWITCHES; index++) { | |
480 | ds = dst->ds[index]; | |
481 | if (!ds) | |
482 | continue; | |
483 | ||
484 | dsa_ds_unapply(dst, ds); | |
485 | } | |
486 | ||
8b0d3ea5 VD |
487 | if (dst->cpu_dp) |
488 | dsa_cpu_port_ethtool_restore(dst->cpu_dp->ds); | |
0c73c523 | 489 | |
83c0afae AL |
490 | pr_info("DSA: tree %d unapplied\n", dst->tree); |
491 | dst->applied = false; | |
492 | } | |
493 | ||
293784a8 | 494 | static int dsa_cpu_parse(struct dsa_port *port, u32 index, |
83c0afae AL |
495 | struct dsa_switch_tree *dst, |
496 | struct dsa_switch *ds) | |
497 | { | |
7b314362 | 498 | enum dsa_tag_protocol tag_protocol; |
83c0afae AL |
499 | struct net_device *ethernet_dev; |
500 | struct device_node *ethernet; | |
501 | ||
71e0bbde FF |
502 | if (port->dn) { |
503 | ethernet = of_parse_phandle(port->dn, "ethernet", 0); | |
504 | if (!ethernet) | |
505 | return -EINVAL; | |
506 | ethernet_dev = of_find_net_device_by_node(ethernet); | |
507 | } else { | |
508 | ethernet_dev = dsa_dev_to_net_device(ds->cd->netdev[index]); | |
509 | dev_put(ethernet_dev); | |
510 | } | |
83c0afae | 511 | |
83c0afae AL |
512 | if (!ethernet_dev) |
513 | return -EPROBE_DEFER; | |
514 | ||
515 | if (!ds->master_netdev) | |
516 | ds->master_netdev = ethernet_dev; | |
517 | ||
518 | if (!dst->master_netdev) | |
519 | dst->master_netdev = ethernet_dev; | |
520 | ||
8b0d3ea5 VD |
521 | if (!dst->cpu_dp) |
522 | dst->cpu_dp = port; | |
83c0afae | 523 | |
9d490b4e | 524 | tag_protocol = ds->ops->get_tag_protocol(ds); |
7b314362 | 525 | dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol); |
83c0afae AL |
526 | if (IS_ERR(dst->tag_ops)) { |
527 | dev_warn(ds->dev, "No tagger for this switch\n"); | |
528 | return PTR_ERR(dst->tag_ops); | |
529 | } | |
530 | ||
531 | dst->rcv = dst->tag_ops->rcv; | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | static int dsa_ds_parse(struct dsa_switch_tree *dst, struct dsa_switch *ds) | |
537 | { | |
293784a8 | 538 | struct dsa_port *port; |
83c0afae AL |
539 | u32 index; |
540 | int err; | |
541 | ||
26895e29 | 542 | for (index = 0; index < ds->num_ports; index++) { |
293784a8 FF |
543 | port = &ds->ports[index]; |
544 | if (!dsa_port_is_valid(port)) | |
83c0afae AL |
545 | continue; |
546 | ||
547 | if (dsa_port_is_cpu(port)) { | |
548 | err = dsa_cpu_parse(port, index, dst, ds); | |
549 | if (err) | |
550 | return err; | |
551 | } | |
552 | } | |
553 | ||
554 | pr_info("DSA: switch %d %d parsed\n", dst->tree, ds->index); | |
555 | ||
556 | return 0; | |
557 | } | |
558 | ||
559 | static int dsa_dst_parse(struct dsa_switch_tree *dst) | |
560 | { | |
561 | struct dsa_switch *ds; | |
562 | u32 index; | |
563 | int err; | |
564 | ||
565 | for (index = 0; index < DSA_MAX_SWITCHES; index++) { | |
566 | ds = dst->ds[index]; | |
567 | if (!ds) | |
568 | continue; | |
569 | ||
570 | err = dsa_ds_parse(dst, ds); | |
571 | if (err) | |
572 | return err; | |
573 | } | |
574 | ||
575 | if (!dst->master_netdev) { | |
576 | pr_warn("Tree has no master device\n"); | |
577 | return -EINVAL; | |
578 | } | |
579 | ||
580 | pr_info("DSA: tree %d parsed\n", dst->tree); | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | static int dsa_parse_ports_dn(struct device_node *ports, struct dsa_switch *ds) | |
586 | { | |
587 | struct device_node *port; | |
588 | int err; | |
589 | u32 reg; | |
590 | ||
591 | for_each_available_child_of_node(ports, port) { | |
592 | err = of_property_read_u32(port, "reg", ®); | |
593 | if (err) | |
594 | return err; | |
595 | ||
26895e29 | 596 | if (reg >= ds->num_ports) |
83c0afae AL |
597 | return -EINVAL; |
598 | ||
599 | ds->ports[reg].dn = port; | |
6e830d8f | 600 | |
9d490b4e | 601 | /* Initialize enabled_port_mask now for ops->setup() |
6e830d8f FF |
602 | * to have access to a correct value, just like what |
603 | * net/dsa/dsa.c::dsa_switch_setup_one does. | |
604 | */ | |
293784a8 | 605 | if (!dsa_port_is_cpu(&ds->ports[reg])) |
6e830d8f | 606 | ds->enabled_port_mask |= 1 << reg; |
83c0afae AL |
607 | } |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
71e0bbde FF |
612 | static int dsa_parse_ports(struct dsa_chip_data *cd, struct dsa_switch *ds) |
613 | { | |
614 | bool valid_name_found = false; | |
615 | unsigned int i; | |
616 | ||
617 | for (i = 0; i < DSA_MAX_PORTS; i++) { | |
618 | if (!cd->port_names[i]) | |
619 | continue; | |
620 | ||
621 | ds->ports[i].name = cd->port_names[i]; | |
622 | ||
623 | /* Initialize enabled_port_mask now for drv->setup() | |
624 | * to have access to a correct value, just like what | |
625 | * net/dsa/dsa.c::dsa_switch_setup_one does. | |
626 | */ | |
627 | if (!dsa_port_is_cpu(&ds->ports[i])) | |
628 | ds->enabled_port_mask |= 1 << i; | |
629 | ||
630 | valid_name_found = true; | |
631 | } | |
632 | ||
633 | if (!valid_name_found && i == DSA_MAX_PORTS) | |
634 | return -EINVAL; | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
3512a8e9 | 639 | static int dsa_parse_member_dn(struct device_node *np, u32 *tree, u32 *index) |
83c0afae AL |
640 | { |
641 | int err; | |
642 | ||
643 | *tree = *index = 0; | |
644 | ||
645 | err = of_property_read_u32_index(np, "dsa,member", 0, tree); | |
646 | if (err) { | |
647 | /* Does not exist, but it is optional */ | |
648 | if (err == -EINVAL) | |
649 | return 0; | |
650 | return err; | |
651 | } | |
652 | ||
653 | err = of_property_read_u32_index(np, "dsa,member", 1, index); | |
654 | if (err) | |
655 | return err; | |
656 | ||
657 | if (*index >= DSA_MAX_SWITCHES) | |
658 | return -EINVAL; | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
71e0bbde FF |
663 | static int dsa_parse_member(struct dsa_chip_data *pd, u32 *tree, u32 *index) |
664 | { | |
665 | if (!pd) | |
666 | return -ENODEV; | |
667 | ||
668 | /* We do not support complex trees with dsa_chip_data */ | |
669 | *tree = 0; | |
670 | *index = 0; | |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
83c0afae AL |
675 | static struct device_node *dsa_get_ports(struct dsa_switch *ds, |
676 | struct device_node *np) | |
677 | { | |
678 | struct device_node *ports; | |
679 | ||
680 | ports = of_get_child_by_name(np, "ports"); | |
681 | if (!ports) { | |
682 | dev_err(ds->dev, "no ports child node found\n"); | |
683 | return ERR_PTR(-EINVAL); | |
684 | } | |
685 | ||
686 | return ports; | |
687 | } | |
688 | ||
55ed0ce0 | 689 | static int _dsa_register_switch(struct dsa_switch *ds, struct device *dev) |
83c0afae | 690 | { |
71e0bbde | 691 | struct dsa_chip_data *pdata = dev->platform_data; |
55ed0ce0 | 692 | struct device_node *np = dev->of_node; |
83c0afae | 693 | struct dsa_switch_tree *dst; |
bc1727d2 | 694 | struct device_node *ports; |
83c0afae | 695 | u32 tree, index; |
d390238c | 696 | int i, err; |
83c0afae | 697 | |
71e0bbde FF |
698 | if (np) { |
699 | err = dsa_parse_member_dn(np, &tree, &index); | |
700 | if (err) | |
701 | return err; | |
83c0afae | 702 | |
71e0bbde FF |
703 | ports = dsa_get_ports(ds, np); |
704 | if (IS_ERR(ports)) | |
705 | return PTR_ERR(ports); | |
83c0afae | 706 | |
71e0bbde FF |
707 | err = dsa_parse_ports_dn(ports, ds); |
708 | if (err) | |
709 | return err; | |
710 | } else { | |
711 | err = dsa_parse_member(pdata, &tree, &index); | |
712 | if (err) | |
713 | return err; | |
714 | ||
715 | err = dsa_parse_ports(pdata, ds); | |
716 | if (err) | |
717 | return err; | |
718 | } | |
83c0afae AL |
719 | |
720 | dst = dsa_get_dst(tree); | |
721 | if (!dst) { | |
722 | dst = dsa_add_dst(tree); | |
723 | if (!dst) | |
724 | return -ENOMEM; | |
725 | } | |
726 | ||
727 | if (dst->ds[index]) { | |
728 | err = -EBUSY; | |
729 | goto out; | |
730 | } | |
731 | ||
732 | ds->dst = dst; | |
733 | ds->index = index; | |
71e0bbde | 734 | ds->cd = pdata; |
d390238c VD |
735 | |
736 | /* Initialize the routing table */ | |
737 | for (i = 0; i < DSA_MAX_SWITCHES; ++i) | |
738 | ds->rtable[i] = DSA_RTABLE_NONE; | |
739 | ||
83c0afae AL |
740 | dsa_dst_add_ds(dst, ds, index); |
741 | ||
742 | err = dsa_dst_complete(dst); | |
743 | if (err < 0) | |
744 | goto out_del_dst; | |
745 | ||
746 | if (err == 1) { | |
747 | /* Not all switches registered yet */ | |
748 | err = 0; | |
749 | goto out; | |
750 | } | |
751 | ||
752 | if (dst->applied) { | |
753 | pr_info("DSA: Disjoint trees?\n"); | |
754 | return -EINVAL; | |
755 | } | |
756 | ||
757 | err = dsa_dst_parse(dst); | |
5e6eb456 VB |
758 | if (err) { |
759 | if (err == -EPROBE_DEFER) { | |
760 | dsa_dst_del_ds(dst, ds, ds->index); | |
761 | return err; | |
762 | } | |
763 | ||
83c0afae | 764 | goto out_del_dst; |
5e6eb456 | 765 | } |
83c0afae AL |
766 | |
767 | err = dsa_dst_apply(dst); | |
768 | if (err) { | |
769 | dsa_dst_unapply(dst); | |
770 | goto out_del_dst; | |
771 | } | |
772 | ||
773 | dsa_put_dst(dst); | |
774 | return 0; | |
775 | ||
776 | out_del_dst: | |
777 | dsa_dst_del_ds(dst, ds, ds->index); | |
778 | out: | |
779 | dsa_put_dst(dst); | |
780 | ||
781 | return err; | |
782 | } | |
783 | ||
a0c02161 VD |
784 | struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n) |
785 | { | |
786 | size_t size = sizeof(struct dsa_switch) + n * sizeof(struct dsa_port); | |
787 | struct dsa_switch *ds; | |
818be848 | 788 | int i; |
a0c02161 VD |
789 | |
790 | ds = devm_kzalloc(dev, size, GFP_KERNEL); | |
791 | if (!ds) | |
792 | return NULL; | |
793 | ||
794 | ds->dev = dev; | |
795 | ds->num_ports = n; | |
796 | ||
818be848 VD |
797 | for (i = 0; i < ds->num_ports; ++i) { |
798 | ds->ports[i].index = i; | |
799 | ds->ports[i].ds = ds; | |
800 | } | |
801 | ||
a0c02161 VD |
802 | return ds; |
803 | } | |
804 | EXPORT_SYMBOL_GPL(dsa_switch_alloc); | |
805 | ||
55ed0ce0 | 806 | int dsa_register_switch(struct dsa_switch *ds, struct device *dev) |
83c0afae AL |
807 | { |
808 | int err; | |
809 | ||
810 | mutex_lock(&dsa2_mutex); | |
55ed0ce0 | 811 | err = _dsa_register_switch(ds, dev); |
83c0afae AL |
812 | mutex_unlock(&dsa2_mutex); |
813 | ||
814 | return err; | |
815 | } | |
816 | EXPORT_SYMBOL_GPL(dsa_register_switch); | |
817 | ||
85c22bad | 818 | static void _dsa_unregister_switch(struct dsa_switch *ds) |
83c0afae AL |
819 | { |
820 | struct dsa_switch_tree *dst = ds->dst; | |
821 | ||
822 | dsa_dst_unapply(dst); | |
823 | ||
824 | dsa_dst_del_ds(dst, ds, ds->index); | |
825 | } | |
826 | ||
827 | void dsa_unregister_switch(struct dsa_switch *ds) | |
828 | { | |
829 | mutex_lock(&dsa2_mutex); | |
830 | _dsa_unregister_switch(ds); | |
831 | mutex_unlock(&dsa2_mutex); | |
832 | } | |
833 | EXPORT_SYMBOL_GPL(dsa_unregister_switch); |