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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/dsa/dsa2.c - Hardware switch handling, binding version 2
4 * Copyright (c) 2008-2009 Marvell Semiconductor
5 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
6 * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
7 */
8
9#include <linux/device.h>
10#include <linux/err.h>
11#include <linux/list.h>
12#include <linux/netdevice.h>
13#include <linux/slab.h>
14#include <linux/rtnetlink.h>
15#include <linux/of.h>
16#include <linux/of_net.h>
17#include <net/devlink.h>
18
19#include "dsa_priv.h"
20
21static DEFINE_MUTEX(dsa2_mutex);
22LIST_HEAD(dsa_tree_list);
23
24static const struct devlink_ops dsa_devlink_ops = {
25};
26
27struct dsa_switch *dsa_switch_find(int tree_index, int sw_index)
28{
29 struct dsa_switch_tree *dst;
30 struct dsa_port *dp;
31
32 list_for_each_entry(dst, &dsa_tree_list, list) {
33 if (dst->index != tree_index)
34 continue;
35
36 list_for_each_entry(dp, &dst->ports, list) {
37 if (dp->ds->index != sw_index)
38 continue;
39
40 return dp->ds;
41 }
42 }
43
44 return NULL;
45}
46EXPORT_SYMBOL_GPL(dsa_switch_find);
47
48static struct dsa_switch_tree *dsa_tree_find(int index)
49{
50 struct dsa_switch_tree *dst;
51
52 list_for_each_entry(dst, &dsa_tree_list, list)
53 if (dst->index == index)
54 return dst;
55
56 return NULL;
57}
58
59static struct dsa_switch_tree *dsa_tree_alloc(int index)
60{
61 struct dsa_switch_tree *dst;
62
63 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
64 if (!dst)
65 return NULL;
66
67 dst->index = index;
68
69 INIT_LIST_HEAD(&dst->rtable);
70
71 INIT_LIST_HEAD(&dst->ports);
72
73 INIT_LIST_HEAD(&dst->list);
74 list_add_tail(&dst->list, &dsa_tree_list);
75
76 kref_init(&dst->refcount);
77
78 return dst;
79}
80
81static void dsa_tree_free(struct dsa_switch_tree *dst)
82{
83 list_del(&dst->list);
84 kfree(dst);
85}
86
87static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst)
88{
89 if (dst)
90 kref_get(&dst->refcount);
91
92 return dst;
93}
94
95static struct dsa_switch_tree *dsa_tree_touch(int index)
96{
97 struct dsa_switch_tree *dst;
98
99 dst = dsa_tree_find(index);
100 if (dst)
101 return dsa_tree_get(dst);
102 else
103 return dsa_tree_alloc(index);
104}
105
106static void dsa_tree_release(struct kref *ref)
107{
108 struct dsa_switch_tree *dst;
109
110 dst = container_of(ref, struct dsa_switch_tree, refcount);
111
112 dsa_tree_free(dst);
113}
114
115static void dsa_tree_put(struct dsa_switch_tree *dst)
116{
117 if (dst)
118 kref_put(&dst->refcount, dsa_tree_release);
119}
120
121static bool dsa_port_is_dsa(struct dsa_port *port)
122{
123 return port->type == DSA_PORT_TYPE_DSA;
124}
125
126static bool dsa_port_is_cpu(struct dsa_port *port)
127{
128 return port->type == DSA_PORT_TYPE_CPU;
129}
130
131static bool dsa_port_is_user(struct dsa_port *dp)
132{
133 return dp->type == DSA_PORT_TYPE_USER;
134}
135
136static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
137 struct device_node *dn)
138{
139 struct dsa_port *dp;
140
141 list_for_each_entry(dp, &dst->ports, list)
142 if (dp->dn == dn)
143 return dp;
144
145 return NULL;
146}
147
148static struct dsa_link *dsa_link_touch(struct dsa_port *dp,
149 struct dsa_port *link_dp)
150{
151 struct dsa_switch *ds = dp->ds;
152 struct dsa_switch_tree *dst;
153 struct dsa_link *dl;
154
155 dst = ds->dst;
156
157 list_for_each_entry(dl, &dst->rtable, list)
158 if (dl->dp == dp && dl->link_dp == link_dp)
159 return dl;
160
161 dl = kzalloc(sizeof(*dl), GFP_KERNEL);
162 if (!dl)
163 return NULL;
164
165 dl->dp = dp;
166 dl->link_dp = link_dp;
167
168 INIT_LIST_HEAD(&dl->list);
169 list_add_tail(&dl->list, &dst->rtable);
170
171 return dl;
172}
173
174static bool dsa_port_setup_routing_table(struct dsa_port *dp)
175{
176 struct dsa_switch *ds = dp->ds;
177 struct dsa_switch_tree *dst = ds->dst;
178 struct device_node *dn = dp->dn;
179 struct of_phandle_iterator it;
180 struct dsa_port *link_dp;
181 struct dsa_link *dl;
182 int err;
183
184 of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
185 link_dp = dsa_tree_find_port_by_node(dst, it.node);
186 if (!link_dp) {
187 of_node_put(it.node);
188 return false;
189 }
190
191 dl = dsa_link_touch(dp, link_dp);
192 if (!dl) {
193 of_node_put(it.node);
194 return false;
195 }
196 }
197
198 return true;
199}
200
201static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
202{
203 bool complete = true;
204 struct dsa_port *dp;
205
206 list_for_each_entry(dp, &dst->ports, list) {
207 if (dsa_port_is_dsa(dp)) {
208 complete = dsa_port_setup_routing_table(dp);
209 if (!complete)
210 break;
211 }
212 }
213
214 return complete;
215}
216
217static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
218{
219 struct dsa_port *dp;
220
221 list_for_each_entry(dp, &dst->ports, list)
222 if (dsa_port_is_cpu(dp))
223 return dp;
224
225 return NULL;
226}
227
228static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
229{
230 struct dsa_port *cpu_dp, *dp;
231
232 cpu_dp = dsa_tree_find_first_cpu(dst);
233 if (!cpu_dp) {
234 pr_err("DSA: tree %d has no CPU port\n", dst->index);
235 return -EINVAL;
236 }
237
238 /* Assign the default CPU port to all ports of the fabric */
239 list_for_each_entry(dp, &dst->ports, list)
240 if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
241 dp->cpu_dp = cpu_dp;
242
243 return 0;
244}
245
246static void dsa_tree_teardown_default_cpu(struct dsa_switch_tree *dst)
247{
248 struct dsa_port *dp;
249
250 list_for_each_entry(dp, &dst->ports, list)
251 if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
252 dp->cpu_dp = NULL;
253}
254
255static int dsa_port_setup(struct dsa_port *dp)
256{
257 struct dsa_switch *ds = dp->ds;
258 struct dsa_switch_tree *dst = ds->dst;
259 const unsigned char *id = (const unsigned char *)&dst->index;
260 const unsigned char len = sizeof(dst->index);
261 struct devlink_port *dlp = &dp->devlink_port;
262 bool dsa_port_link_registered = false;
263 bool devlink_port_registered = false;
264 struct devlink_port_attrs attrs = {};
265 struct devlink *dl = ds->devlink;
266 bool dsa_port_enabled = false;
267 int err = 0;
268
269 attrs.phys.port_number = dp->index;
270 memcpy(attrs.switch_id.id, id, len);
271 attrs.switch_id.id_len = len;
272
273 if (dp->setup)
274 return 0;
275
276 switch (dp->type) {
277 case DSA_PORT_TYPE_UNUSED:
278 dsa_port_disable(dp);
279 break;
280 case DSA_PORT_TYPE_CPU:
281 memset(dlp, 0, sizeof(*dlp));
282 attrs.flavour = DEVLINK_PORT_FLAVOUR_CPU;
283 devlink_port_attrs_set(dlp, &attrs);
284 err = devlink_port_register(dl, dlp, dp->index);
285 if (err)
286 break;
287 devlink_port_registered = true;
288
289 err = dsa_port_link_register_of(dp);
290 if (err)
291 break;
292 dsa_port_link_registered = true;
293
294 err = dsa_port_enable(dp, NULL);
295 if (err)
296 break;
297 dsa_port_enabled = true;
298
299 break;
300 case DSA_PORT_TYPE_DSA:
301 memset(dlp, 0, sizeof(*dlp));
302 attrs.flavour = DEVLINK_PORT_FLAVOUR_DSA;
303 devlink_port_attrs_set(dlp, &attrs);
304 err = devlink_port_register(dl, dlp, dp->index);
305 if (err)
306 break;
307 devlink_port_registered = true;
308
309 err = dsa_port_link_register_of(dp);
310 if (err)
311 break;
312 dsa_port_link_registered = true;
313
314 err = dsa_port_enable(dp, NULL);
315 if (err)
316 break;
317 dsa_port_enabled = true;
318
319 break;
320 case DSA_PORT_TYPE_USER:
321 memset(dlp, 0, sizeof(*dlp));
322 attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
323 devlink_port_attrs_set(dlp, &attrs);
324 err = devlink_port_register(dl, dlp, dp->index);
325 if (err)
326 break;
327 devlink_port_registered = true;
328
329 dp->mac = of_get_mac_address(dp->dn);
330 err = dsa_slave_create(dp);
331 if (err)
332 break;
333
334 devlink_port_type_eth_set(dlp, dp->slave);
335 break;
336 }
337
338 if (err && dsa_port_enabled)
339 dsa_port_disable(dp);
340 if (err && dsa_port_link_registered)
341 dsa_port_link_unregister_of(dp);
342 if (err && devlink_port_registered)
343 devlink_port_unregister(dlp);
344 if (err)
345 return err;
346
347 dp->setup = true;
348
349 return 0;
350}
351
352static void dsa_port_teardown(struct dsa_port *dp)
353{
354 struct devlink_port *dlp = &dp->devlink_port;
355
356 if (!dp->setup)
357 return;
358
359 switch (dp->type) {
360 case DSA_PORT_TYPE_UNUSED:
361 break;
362 case DSA_PORT_TYPE_CPU:
363 dsa_port_disable(dp);
364 dsa_tag_driver_put(dp->tag_ops);
365 devlink_port_unregister(dlp);
366 dsa_port_link_unregister_of(dp);
367 break;
368 case DSA_PORT_TYPE_DSA:
369 dsa_port_disable(dp);
370 devlink_port_unregister(dlp);
371 dsa_port_link_unregister_of(dp);
372 break;
373 case DSA_PORT_TYPE_USER:
374 devlink_port_unregister(dlp);
375 if (dp->slave) {
376 dsa_slave_destroy(dp->slave);
377 dp->slave = NULL;
378 }
379 break;
380 }
381
382 dp->setup = false;
383}
384
385static int dsa_switch_setup(struct dsa_switch *ds)
386{
387 struct dsa_devlink_priv *dl_priv;
388 int err;
389
390 if (ds->setup)
391 return 0;
392
393 /* Initialize ds->phys_mii_mask before registering the slave MDIO bus
394 * driver and before ops->setup() has run, since the switch drivers and
395 * the slave MDIO bus driver rely on these values for probing PHY
396 * devices or not
397 */
398 ds->phys_mii_mask |= dsa_user_ports(ds);
399
400 /* Add the switch to devlink before calling setup, so that setup can
401 * add dpipe tables
402 */
403 ds->devlink = devlink_alloc(&dsa_devlink_ops, sizeof(*dl_priv));
404 if (!ds->devlink)
405 return -ENOMEM;
406 dl_priv = devlink_priv(ds->devlink);
407 dl_priv->ds = ds;
408
409 err = devlink_register(ds->devlink, ds->dev);
410 if (err)
411 goto free_devlink;
412
413 err = dsa_switch_register_notifier(ds);
414 if (err)
415 goto unregister_devlink;
416
417 err = ds->ops->setup(ds);
418 if (err < 0)
419 goto unregister_notifier;
420
421 devlink_params_publish(ds->devlink);
422
423 if (!ds->slave_mii_bus && ds->ops->phy_read) {
424 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
425 if (!ds->slave_mii_bus) {
426 err = -ENOMEM;
427 goto unregister_notifier;
428 }
429
430 dsa_slave_mii_bus_init(ds);
431
432 err = mdiobus_register(ds->slave_mii_bus);
433 if (err < 0)
434 goto unregister_notifier;
435 }
436
437 ds->setup = true;
438
439 return 0;
440
441unregister_notifier:
442 dsa_switch_unregister_notifier(ds);
443unregister_devlink:
444 devlink_unregister(ds->devlink);
445free_devlink:
446 devlink_free(ds->devlink);
447 ds->devlink = NULL;
448
449 return err;
450}
451
452static void dsa_switch_teardown(struct dsa_switch *ds)
453{
454 if (!ds->setup)
455 return;
456
457 if (ds->slave_mii_bus && ds->ops->phy_read)
458 mdiobus_unregister(ds->slave_mii_bus);
459
460 dsa_switch_unregister_notifier(ds);
461
462 if (ds->ops->teardown)
463 ds->ops->teardown(ds);
464
465 if (ds->devlink) {
466 devlink_unregister(ds->devlink);
467 devlink_free(ds->devlink);
468 ds->devlink = NULL;
469 }
470
471 ds->setup = false;
472}
473
474static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
475{
476 struct dsa_port *dp;
477 int err;
478
479 list_for_each_entry(dp, &dst->ports, list) {
480 err = dsa_switch_setup(dp->ds);
481 if (err)
482 goto teardown;
483 }
484
485 list_for_each_entry(dp, &dst->ports, list) {
486 err = dsa_port_setup(dp);
487 if (err)
488 continue;
489 }
490
491 return 0;
492
493teardown:
494 list_for_each_entry(dp, &dst->ports, list)
495 dsa_port_teardown(dp);
496
497 list_for_each_entry(dp, &dst->ports, list)
498 dsa_switch_teardown(dp->ds);
499
500 return err;
501}
502
503static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
504{
505 struct dsa_port *dp;
506
507 list_for_each_entry(dp, &dst->ports, list)
508 dsa_port_teardown(dp);
509
510 list_for_each_entry(dp, &dst->ports, list)
511 dsa_switch_teardown(dp->ds);
512}
513
514static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
515{
516 struct dsa_port *dp;
517 int err;
518
519 list_for_each_entry(dp, &dst->ports, list) {
520 if (dsa_port_is_cpu(dp)) {
521 err = dsa_master_setup(dp->master, dp);
522 if (err)
523 return err;
524 }
525 }
526
527 return 0;
528}
529
530static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
531{
532 struct dsa_port *dp;
533
534 list_for_each_entry(dp, &dst->ports, list)
535 if (dsa_port_is_cpu(dp))
536 dsa_master_teardown(dp->master);
537}
538
539static int dsa_tree_setup(struct dsa_switch_tree *dst)
540{
541 bool complete;
542 int err;
543
544 if (dst->setup) {
545 pr_err("DSA: tree %d already setup! Disjoint trees?\n",
546 dst->index);
547 return -EEXIST;
548 }
549
550 complete = dsa_tree_setup_routing_table(dst);
551 if (!complete)
552 return 0;
553
554 err = dsa_tree_setup_default_cpu(dst);
555 if (err)
556 return err;
557
558 err = dsa_tree_setup_switches(dst);
559 if (err)
560 goto teardown_default_cpu;
561
562 err = dsa_tree_setup_master(dst);
563 if (err)
564 goto teardown_switches;
565
566 dst->setup = true;
567
568 pr_info("DSA: tree %d setup\n", dst->index);
569
570 return 0;
571
572teardown_switches:
573 dsa_tree_teardown_switches(dst);
574teardown_default_cpu:
575 dsa_tree_teardown_default_cpu(dst);
576
577 return err;
578}
579
580static void dsa_tree_teardown(struct dsa_switch_tree *dst)
581{
582 struct dsa_link *dl, *next;
583
584 if (!dst->setup)
585 return;
586
587 dsa_tree_teardown_master(dst);
588
589 dsa_tree_teardown_switches(dst);
590
591 dsa_tree_teardown_default_cpu(dst);
592
593 list_for_each_entry_safe(dl, next, &dst->rtable, list) {
594 list_del(&dl->list);
595 kfree(dl);
596 }
597
598 pr_info("DSA: tree %d torn down\n", dst->index);
599
600 dst->setup = false;
601}
602
603static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index)
604{
605 struct dsa_switch_tree *dst = ds->dst;
606 struct dsa_port *dp;
607
608 list_for_each_entry(dp, &dst->ports, list)
609 if (dp->ds == ds && dp->index == index)
610 return dp;
611
612 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
613 if (!dp)
614 return NULL;
615
616 dp->ds = ds;
617 dp->index = index;
618
619 INIT_LIST_HEAD(&dp->list);
620 list_add_tail(&dp->list, &dst->ports);
621
622 return dp;
623}
624
625static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
626{
627 if (!name)
628 name = "eth%d";
629
630 dp->type = DSA_PORT_TYPE_USER;
631 dp->name = name;
632
633 return 0;
634}
635
636static int dsa_port_parse_dsa(struct dsa_port *dp)
637{
638 dp->type = DSA_PORT_TYPE_DSA;
639
640 return 0;
641}
642
643static enum dsa_tag_protocol dsa_get_tag_protocol(struct dsa_port *dp,
644 struct net_device *master)
645{
646 enum dsa_tag_protocol tag_protocol = DSA_TAG_PROTO_NONE;
647 struct dsa_switch *mds, *ds = dp->ds;
648 unsigned int mdp_upstream;
649 struct dsa_port *mdp;
650
651 /* It is possible to stack DSA switches onto one another when that
652 * happens the switch driver may want to know if its tagging protocol
653 * is going to work in such a configuration.
654 */
655 if (dsa_slave_dev_check(master)) {
656 mdp = dsa_slave_to_port(master);
657 mds = mdp->ds;
658 mdp_upstream = dsa_upstream_port(mds, mdp->index);
659 tag_protocol = mds->ops->get_tag_protocol(mds, mdp_upstream,
660 DSA_TAG_PROTO_NONE);
661 }
662
663 /* If the master device is not itself a DSA slave in a disjoint DSA
664 * tree, then return immediately.
665 */
666 return ds->ops->get_tag_protocol(ds, dp->index, tag_protocol);
667}
668
669static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
670{
671 struct dsa_switch *ds = dp->ds;
672 struct dsa_switch_tree *dst = ds->dst;
673 const struct dsa_device_ops *tag_ops;
674 enum dsa_tag_protocol tag_protocol;
675
676 tag_protocol = dsa_get_tag_protocol(dp, master);
677 tag_ops = dsa_tag_driver_get(tag_protocol);
678 if (IS_ERR(tag_ops)) {
679 if (PTR_ERR(tag_ops) == -ENOPROTOOPT)
680 return -EPROBE_DEFER;
681 dev_warn(ds->dev, "No tagger for this switch\n");
682 dp->master = NULL;
683 return PTR_ERR(tag_ops);
684 }
685
686 dp->master = master;
687 dp->type = DSA_PORT_TYPE_CPU;
688 dp->filter = tag_ops->filter;
689 dp->rcv = tag_ops->rcv;
690 dp->tag_ops = tag_ops;
691 dp->dst = dst;
692
693 return 0;
694}
695
696static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
697{
698 struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
699 const char *name = of_get_property(dn, "label", NULL);
700 bool link = of_property_read_bool(dn, "link");
701
702 dp->dn = dn;
703
704 if (ethernet) {
705 struct net_device *master;
706
707 master = of_find_net_device_by_node(ethernet);
708 if (!master)
709 return -EPROBE_DEFER;
710
711 return dsa_port_parse_cpu(dp, master);
712 }
713
714 if (link)
715 return dsa_port_parse_dsa(dp);
716
717 return dsa_port_parse_user(dp, name);
718}
719
720static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
721 struct device_node *dn)
722{
723 struct device_node *ports, *port;
724 struct dsa_port *dp;
725 int err = 0;
726 u32 reg;
727
728 ports = of_get_child_by_name(dn, "ports");
729 if (!ports) {
730 /* The second possibility is "ethernet-ports" */
731 ports = of_get_child_by_name(dn, "ethernet-ports");
732 if (!ports) {
733 dev_err(ds->dev, "no ports child node found\n");
734 return -EINVAL;
735 }
736 }
737
738 for_each_available_child_of_node(ports, port) {
739 err = of_property_read_u32(port, "reg", ®);
740 if (err)
741 goto out_put_node;
742
743 if (reg >= ds->num_ports) {
744 err = -EINVAL;
745 goto out_put_node;
746 }
747
748 dp = dsa_to_port(ds, reg);
749
750 err = dsa_port_parse_of(dp, port);
751 if (err)
752 goto out_put_node;
753 }
754
755out_put_node:
756 of_node_put(ports);
757 return err;
758}
759
760static int dsa_switch_parse_member_of(struct dsa_switch *ds,
761 struct device_node *dn)
762{
763 u32 m[2] = { 0, 0 };
764 int sz;
765
766 /* Don't error out if this optional property isn't found */
767 sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
768 if (sz < 0 && sz != -EINVAL)
769 return sz;
770
771 ds->index = m[1];
772
773 ds->dst = dsa_tree_touch(m[0]);
774 if (!ds->dst)
775 return -ENOMEM;
776
777 return 0;
778}
779
780static int dsa_switch_touch_ports(struct dsa_switch *ds)
781{
782 struct dsa_port *dp;
783 int port;
784
785 for (port = 0; port < ds->num_ports; port++) {
786 dp = dsa_port_touch(ds, port);
787 if (!dp)
788 return -ENOMEM;
789 }
790
791 return 0;
792}
793
794static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
795{
796 int err;
797
798 err = dsa_switch_parse_member_of(ds, dn);
799 if (err)
800 return err;
801
802 err = dsa_switch_touch_ports(ds);
803 if (err)
804 return err;
805
806 return dsa_switch_parse_ports_of(ds, dn);
807}
808
809static int dsa_port_parse(struct dsa_port *dp, const char *name,
810 struct device *dev)
811{
812 if (!strcmp(name, "cpu")) {
813 struct net_device *master;
814
815 master = dsa_dev_to_net_device(dev);
816 if (!master)
817 return -EPROBE_DEFER;
818
819 dev_put(master);
820
821 return dsa_port_parse_cpu(dp, master);
822 }
823
824 if (!strcmp(name, "dsa"))
825 return dsa_port_parse_dsa(dp);
826
827 return dsa_port_parse_user(dp, name);
828}
829
830static int dsa_switch_parse_ports(struct dsa_switch *ds,
831 struct dsa_chip_data *cd)
832{
833 bool valid_name_found = false;
834 struct dsa_port *dp;
835 struct device *dev;
836 const char *name;
837 unsigned int i;
838 int err;
839
840 for (i = 0; i < DSA_MAX_PORTS; i++) {
841 name = cd->port_names[i];
842 dev = cd->netdev[i];
843 dp = dsa_to_port(ds, i);
844
845 if (!name)
846 continue;
847
848 err = dsa_port_parse(dp, name, dev);
849 if (err)
850 return err;
851
852 valid_name_found = true;
853 }
854
855 if (!valid_name_found && i == DSA_MAX_PORTS)
856 return -EINVAL;
857
858 return 0;
859}
860
861static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
862{
863 int err;
864
865 ds->cd = cd;
866
867 /* We don't support interconnected switches nor multiple trees via
868 * platform data, so this is the unique switch of the tree.
869 */
870 ds->index = 0;
871 ds->dst = dsa_tree_touch(0);
872 if (!ds->dst)
873 return -ENOMEM;
874
875 err = dsa_switch_touch_ports(ds);
876 if (err)
877 return err;
878
879 return dsa_switch_parse_ports(ds, cd);
880}
881
882static void dsa_switch_release_ports(struct dsa_switch *ds)
883{
884 struct dsa_switch_tree *dst = ds->dst;
885 struct dsa_port *dp, *next;
886
887 list_for_each_entry_safe(dp, next, &dst->ports, list) {
888 if (dp->ds != ds)
889 continue;
890 list_del(&dp->list);
891 kfree(dp);
892 }
893}
894
895static int dsa_switch_probe(struct dsa_switch *ds)
896{
897 struct dsa_switch_tree *dst;
898 struct dsa_chip_data *pdata;
899 struct device_node *np;
900 int err;
901
902 if (!ds->dev)
903 return -ENODEV;
904
905 pdata = ds->dev->platform_data;
906 np = ds->dev->of_node;
907
908 if (!ds->num_ports)
909 return -EINVAL;
910
911 if (np) {
912 err = dsa_switch_parse_of(ds, np);
913 if (err)
914 dsa_switch_release_ports(ds);
915 } else if (pdata) {
916 err = dsa_switch_parse(ds, pdata);
917 if (err)
918 dsa_switch_release_ports(ds);
919 } else {
920 err = -ENODEV;
921 }
922
923 if (err)
924 return err;
925
926 dst = ds->dst;
927 dsa_tree_get(dst);
928 err = dsa_tree_setup(dst);
929 if (err) {
930 dsa_switch_release_ports(ds);
931 dsa_tree_put(dst);
932 }
933
934 return err;
935}
936
937int dsa_register_switch(struct dsa_switch *ds)
938{
939 int err;
940
941 mutex_lock(&dsa2_mutex);
942 err = dsa_switch_probe(ds);
943 dsa_tree_put(ds->dst);
944 mutex_unlock(&dsa2_mutex);
945
946 return err;
947}
948EXPORT_SYMBOL_GPL(dsa_register_switch);
949
950static void dsa_switch_remove(struct dsa_switch *ds)
951{
952 struct dsa_switch_tree *dst = ds->dst;
953
954 dsa_tree_teardown(dst);
955 dsa_switch_release_ports(ds);
956 dsa_tree_put(dst);
957}
958
959void dsa_unregister_switch(struct dsa_switch *ds)
960{
961 mutex_lock(&dsa2_mutex);
962 dsa_switch_remove(ds);
963 mutex_unlock(&dsa2_mutex);
964}
965EXPORT_SYMBOL_GPL(dsa_unregister_switch);