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