This source file includes following definitions.
- dsa_tree_find
- dsa_tree_alloc
- dsa_tree_free
- dsa_tree_get
- dsa_tree_touch
- dsa_tree_release
- dsa_tree_put
- dsa_port_is_dsa
- dsa_port_is_cpu
- dsa_port_is_user
- dsa_tree_find_port_by_node
- dsa_port_setup_routing_table
- dsa_switch_setup_routing_table
- dsa_tree_setup_routing_table
- dsa_tree_find_first_cpu
- dsa_tree_setup_default_cpu
- dsa_tree_teardown_default_cpu
- dsa_port_setup
- dsa_port_teardown
- dsa_switch_setup
- dsa_switch_teardown
- dsa_tree_setup_switches
- dsa_tree_teardown_switches
- dsa_tree_setup_master
- dsa_tree_teardown_master
- dsa_tree_setup
- dsa_tree_teardown
- dsa_tree_remove_switch
- dsa_tree_add_switch
- dsa_port_parse_user
- dsa_port_parse_dsa
- dsa_port_parse_cpu
- dsa_port_parse_of
- dsa_switch_parse_ports_of
- dsa_switch_parse_member_of
- dsa_switch_parse_of
- dsa_port_parse
- dsa_switch_parse_ports
- dsa_switch_parse
- dsa_switch_add
- dsa_switch_probe
- dsa_switch_alloc
- dsa_register_switch
- dsa_switch_remove
- dsa_unregister_switch
1
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5
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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
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
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
252 dst->cpu_dp = NULL;
253 }
254
255 static 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 *dl = ds->devlink;
265 bool dsa_port_enabled = false;
266 int err = 0;
267
268 switch (dp->type) {
269 case DSA_PORT_TYPE_UNUSED:
270 dsa_port_disable(dp);
271 break;
272 case DSA_PORT_TYPE_CPU:
273 memset(dlp, 0, sizeof(*dlp));
274 devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_CPU,
275 dp->index, false, 0, id, len);
276 err = devlink_port_register(dl, dlp, dp->index);
277 if (err)
278 break;
279 devlink_port_registered = true;
280
281 err = dsa_port_link_register_of(dp);
282 if (err)
283 break;
284 dsa_port_link_registered = true;
285
286 err = dsa_port_enable(dp, NULL);
287 if (err)
288 break;
289 dsa_port_enabled = true;
290
291 break;
292 case DSA_PORT_TYPE_DSA:
293 memset(dlp, 0, sizeof(*dlp));
294 devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_DSA,
295 dp->index, false, 0, id, len);
296 err = devlink_port_register(dl, dlp, dp->index);
297 if (err)
298 break;
299 devlink_port_registered = true;
300
301 err = dsa_port_link_register_of(dp);
302 if (err)
303 break;
304 dsa_port_link_registered = true;
305
306 err = dsa_port_enable(dp, NULL);
307 if (err)
308 break;
309 dsa_port_enabled = true;
310
311 break;
312 case DSA_PORT_TYPE_USER:
313 memset(dlp, 0, sizeof(*dlp));
314 devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_PHYSICAL,
315 dp->index, false, 0, id, len);
316 err = devlink_port_register(dl, dlp, dp->index);
317 if (err)
318 break;
319 devlink_port_registered = true;
320
321 dp->mac = of_get_mac_address(dp->dn);
322 err = dsa_slave_create(dp);
323 if (err)
324 break;
325
326 devlink_port_type_eth_set(dlp, dp->slave);
327 break;
328 }
329
330 if (err && dsa_port_enabled)
331 dsa_port_disable(dp);
332 if (err && dsa_port_link_registered)
333 dsa_port_link_unregister_of(dp);
334 if (err && devlink_port_registered)
335 devlink_port_unregister(dlp);
336
337 return err;
338 }
339
340 static void dsa_port_teardown(struct dsa_port *dp)
341 {
342 struct devlink_port *dlp = &dp->devlink_port;
343
344 switch (dp->type) {
345 case DSA_PORT_TYPE_UNUSED:
346 break;
347 case DSA_PORT_TYPE_CPU:
348 dsa_port_disable(dp);
349 dsa_tag_driver_put(dp->tag_ops);
350 devlink_port_unregister(dlp);
351 dsa_port_link_unregister_of(dp);
352 break;
353 case DSA_PORT_TYPE_DSA:
354 dsa_port_disable(dp);
355 devlink_port_unregister(dlp);
356 dsa_port_link_unregister_of(dp);
357 break;
358 case DSA_PORT_TYPE_USER:
359 devlink_port_unregister(dlp);
360 if (dp->slave) {
361 dsa_slave_destroy(dp->slave);
362 dp->slave = NULL;
363 }
364 break;
365 }
366 }
367
368 static int dsa_switch_setup(struct dsa_switch *ds)
369 {
370 int err = 0;
371
372
373
374
375
376
377 ds->phys_mii_mask |= dsa_user_ports(ds);
378
379
380
381
382 ds->devlink = devlink_alloc(&dsa_devlink_ops, 0);
383 if (!ds->devlink)
384 return -ENOMEM;
385
386 err = devlink_register(ds->devlink, ds->dev);
387 if (err)
388 goto free_devlink;
389
390 err = dsa_switch_register_notifier(ds);
391 if (err)
392 goto unregister_devlink;
393
394 err = ds->ops->setup(ds);
395 if (err < 0)
396 goto unregister_notifier;
397
398 if (!ds->slave_mii_bus && ds->ops->phy_read) {
399 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
400 if (!ds->slave_mii_bus) {
401 err = -ENOMEM;
402 goto unregister_notifier;
403 }
404
405 dsa_slave_mii_bus_init(ds);
406
407 err = mdiobus_register(ds->slave_mii_bus);
408 if (err < 0)
409 goto unregister_notifier;
410 }
411
412 return 0;
413
414 unregister_notifier:
415 dsa_switch_unregister_notifier(ds);
416 unregister_devlink:
417 devlink_unregister(ds->devlink);
418 free_devlink:
419 devlink_free(ds->devlink);
420 ds->devlink = NULL;
421
422 return err;
423 }
424
425 static void dsa_switch_teardown(struct dsa_switch *ds)
426 {
427 if (ds->slave_mii_bus && ds->ops->phy_read)
428 mdiobus_unregister(ds->slave_mii_bus);
429
430 dsa_switch_unregister_notifier(ds);
431
432 if (ds->ops->teardown)
433 ds->ops->teardown(ds);
434
435 if (ds->devlink) {
436 devlink_unregister(ds->devlink);
437 devlink_free(ds->devlink);
438 ds->devlink = NULL;
439 }
440
441 }
442
443 static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
444 {
445 struct dsa_switch *ds;
446 struct dsa_port *dp;
447 int device, port, i;
448 int err = 0;
449
450 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
451 ds = dst->ds[device];
452 if (!ds)
453 continue;
454
455 err = dsa_switch_setup(ds);
456 if (err)
457 goto switch_teardown;
458
459 for (port = 0; port < ds->num_ports; port++) {
460 dp = &ds->ports[port];
461
462 err = dsa_port_setup(dp);
463 if (err)
464 continue;
465 }
466 }
467
468 return 0;
469
470 switch_teardown:
471 for (i = 0; i < device; i++) {
472 ds = dst->ds[i];
473 if (!ds)
474 continue;
475
476 for (port = 0; port < ds->num_ports; port++) {
477 dp = &ds->ports[port];
478
479 dsa_port_teardown(dp);
480 }
481
482 dsa_switch_teardown(ds);
483 }
484
485 return err;
486 }
487
488 static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
489 {
490 struct dsa_switch *ds;
491 struct dsa_port *dp;
492 int device, port;
493
494 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
495 ds = dst->ds[device];
496 if (!ds)
497 continue;
498
499 for (port = 0; port < ds->num_ports; port++) {
500 dp = &ds->ports[port];
501
502 dsa_port_teardown(dp);
503 }
504
505 dsa_switch_teardown(ds);
506 }
507 }
508
509 static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
510 {
511 struct dsa_port *cpu_dp = dst->cpu_dp;
512 struct net_device *master = cpu_dp->master;
513
514
515 return dsa_master_setup(master, cpu_dp);
516 }
517
518 static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
519 {
520 struct dsa_port *cpu_dp = dst->cpu_dp;
521 struct net_device *master = cpu_dp->master;
522
523 return dsa_master_teardown(master);
524 }
525
526 static int dsa_tree_setup(struct dsa_switch_tree *dst)
527 {
528 bool complete;
529 int err;
530
531 if (dst->setup) {
532 pr_err("DSA: tree %d already setup! Disjoint trees?\n",
533 dst->index);
534 return -EEXIST;
535 }
536
537 complete = dsa_tree_setup_routing_table(dst);
538 if (!complete)
539 return 0;
540
541 err = dsa_tree_setup_default_cpu(dst);
542 if (err)
543 return err;
544
545 err = dsa_tree_setup_switches(dst);
546 if (err)
547 goto teardown_default_cpu;
548
549 err = dsa_tree_setup_master(dst);
550 if (err)
551 goto teardown_switches;
552
553 dst->setup = true;
554
555 pr_info("DSA: tree %d setup\n", dst->index);
556
557 return 0;
558
559 teardown_switches:
560 dsa_tree_teardown_switches(dst);
561 teardown_default_cpu:
562 dsa_tree_teardown_default_cpu(dst);
563
564 return err;
565 }
566
567 static void dsa_tree_teardown(struct dsa_switch_tree *dst)
568 {
569 if (!dst->setup)
570 return;
571
572 dsa_tree_teardown_master(dst);
573
574 dsa_tree_teardown_switches(dst);
575
576 dsa_tree_teardown_default_cpu(dst);
577
578 pr_info("DSA: tree %d torn down\n", dst->index);
579
580 dst->setup = false;
581 }
582
583 static void dsa_tree_remove_switch(struct dsa_switch_tree *dst,
584 unsigned int index)
585 {
586 dsa_tree_teardown(dst);
587
588 dst->ds[index] = NULL;
589 dsa_tree_put(dst);
590 }
591
592 static int dsa_tree_add_switch(struct dsa_switch_tree *dst,
593 struct dsa_switch *ds)
594 {
595 unsigned int index = ds->index;
596 int err;
597
598 if (dst->ds[index])
599 return -EBUSY;
600
601 dsa_tree_get(dst);
602 dst->ds[index] = ds;
603
604 err = dsa_tree_setup(dst);
605 if (err) {
606 dst->ds[index] = NULL;
607 dsa_tree_put(dst);
608 }
609
610 return err;
611 }
612
613 static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
614 {
615 if (!name)
616 name = "eth%d";
617
618 dp->type = DSA_PORT_TYPE_USER;
619 dp->name = name;
620
621 return 0;
622 }
623
624 static int dsa_port_parse_dsa(struct dsa_port *dp)
625 {
626 dp->type = DSA_PORT_TYPE_DSA;
627
628 return 0;
629 }
630
631 static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
632 {
633 struct dsa_switch *ds = dp->ds;
634 struct dsa_switch_tree *dst = ds->dst;
635 const struct dsa_device_ops *tag_ops;
636 enum dsa_tag_protocol tag_protocol;
637
638 tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
639 tag_ops = dsa_tag_driver_get(tag_protocol);
640 if (IS_ERR(tag_ops)) {
641 if (PTR_ERR(tag_ops) == -ENOPROTOOPT)
642 return -EPROBE_DEFER;
643 dev_warn(ds->dev, "No tagger for this switch\n");
644 return PTR_ERR(tag_ops);
645 }
646
647 dp->type = DSA_PORT_TYPE_CPU;
648 dp->filter = tag_ops->filter;
649 dp->rcv = tag_ops->rcv;
650 dp->tag_ops = tag_ops;
651 dp->master = master;
652 dp->dst = dst;
653
654 return 0;
655 }
656
657 static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
658 {
659 struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
660 const char *name = of_get_property(dn, "label", NULL);
661 bool link = of_property_read_bool(dn, "link");
662
663 dp->dn = dn;
664
665 if (ethernet) {
666 struct net_device *master;
667
668 master = of_find_net_device_by_node(ethernet);
669 if (!master)
670 return -EPROBE_DEFER;
671
672 return dsa_port_parse_cpu(dp, master);
673 }
674
675 if (link)
676 return dsa_port_parse_dsa(dp);
677
678 return dsa_port_parse_user(dp, name);
679 }
680
681 static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
682 struct device_node *dn)
683 {
684 struct device_node *ports, *port;
685 struct dsa_port *dp;
686 int err = 0;
687 u32 reg;
688
689 ports = of_get_child_by_name(dn, "ports");
690 if (!ports) {
691 dev_err(ds->dev, "no ports child node found\n");
692 return -EINVAL;
693 }
694
695 for_each_available_child_of_node(ports, port) {
696 err = of_property_read_u32(port, "reg", ®);
697 if (err)
698 goto out_put_node;
699
700 if (reg >= ds->num_ports) {
701 err = -EINVAL;
702 goto out_put_node;
703 }
704
705 dp = &ds->ports[reg];
706
707 err = dsa_port_parse_of(dp, port);
708 if (err)
709 goto out_put_node;
710 }
711
712 out_put_node:
713 of_node_put(ports);
714 return err;
715 }
716
717 static int dsa_switch_parse_member_of(struct dsa_switch *ds,
718 struct device_node *dn)
719 {
720 u32 m[2] = { 0, 0 };
721 int sz;
722
723
724 sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
725 if (sz < 0 && sz != -EINVAL)
726 return sz;
727
728 ds->index = m[1];
729 if (ds->index >= DSA_MAX_SWITCHES)
730 return -EINVAL;
731
732 ds->dst = dsa_tree_touch(m[0]);
733 if (!ds->dst)
734 return -ENOMEM;
735
736 return 0;
737 }
738
739 static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
740 {
741 int err;
742
743 err = dsa_switch_parse_member_of(ds, dn);
744 if (err)
745 return err;
746
747 return dsa_switch_parse_ports_of(ds, dn);
748 }
749
750 static int dsa_port_parse(struct dsa_port *dp, const char *name,
751 struct device *dev)
752 {
753 if (!strcmp(name, "cpu")) {
754 struct net_device *master;
755
756 master = dsa_dev_to_net_device(dev);
757 if (!master)
758 return -EPROBE_DEFER;
759
760 dev_put(master);
761
762 return dsa_port_parse_cpu(dp, master);
763 }
764
765 if (!strcmp(name, "dsa"))
766 return dsa_port_parse_dsa(dp);
767
768 return dsa_port_parse_user(dp, name);
769 }
770
771 static int dsa_switch_parse_ports(struct dsa_switch *ds,
772 struct dsa_chip_data *cd)
773 {
774 bool valid_name_found = false;
775 struct dsa_port *dp;
776 struct device *dev;
777 const char *name;
778 unsigned int i;
779 int err;
780
781 for (i = 0; i < DSA_MAX_PORTS; i++) {
782 name = cd->port_names[i];
783 dev = cd->netdev[i];
784 dp = &ds->ports[i];
785
786 if (!name)
787 continue;
788
789 err = dsa_port_parse(dp, name, dev);
790 if (err)
791 return err;
792
793 valid_name_found = true;
794 }
795
796 if (!valid_name_found && i == DSA_MAX_PORTS)
797 return -EINVAL;
798
799 return 0;
800 }
801
802 static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
803 {
804 ds->cd = cd;
805
806
807
808
809 ds->index = 0;
810 ds->dst = dsa_tree_touch(0);
811 if (!ds->dst)
812 return -ENOMEM;
813
814 return dsa_switch_parse_ports(ds, cd);
815 }
816
817 static int dsa_switch_add(struct dsa_switch *ds)
818 {
819 struct dsa_switch_tree *dst = ds->dst;
820
821 return dsa_tree_add_switch(dst, ds);
822 }
823
824 static int dsa_switch_probe(struct dsa_switch *ds)
825 {
826 struct dsa_chip_data *pdata = ds->dev->platform_data;
827 struct device_node *np = ds->dev->of_node;
828 int err;
829
830 if (np)
831 err = dsa_switch_parse_of(ds, np);
832 else if (pdata)
833 err = dsa_switch_parse(ds, pdata);
834 else
835 err = -ENODEV;
836
837 if (err)
838 return err;
839
840 return dsa_switch_add(ds);
841 }
842
843 struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
844 {
845 struct dsa_switch *ds;
846 int i;
847
848 ds = devm_kzalloc(dev, struct_size(ds, ports, n), GFP_KERNEL);
849 if (!ds)
850 return NULL;
851
852 ds->dev = dev;
853 ds->num_ports = n;
854
855 for (i = 0; i < ds->num_ports; ++i) {
856 ds->ports[i].index = i;
857 ds->ports[i].ds = ds;
858 }
859
860 return ds;
861 }
862 EXPORT_SYMBOL_GPL(dsa_switch_alloc);
863
864 int dsa_register_switch(struct dsa_switch *ds)
865 {
866 int err;
867
868 mutex_lock(&dsa2_mutex);
869 err = dsa_switch_probe(ds);
870 dsa_tree_put(ds->dst);
871 mutex_unlock(&dsa2_mutex);
872
873 return err;
874 }
875 EXPORT_SYMBOL_GPL(dsa_register_switch);
876
877 static void dsa_switch_remove(struct dsa_switch *ds)
878 {
879 struct dsa_switch_tree *dst = ds->dst;
880 unsigned int index = ds->index;
881
882 dsa_tree_remove_switch(dst, index);
883 }
884
885 void dsa_unregister_switch(struct dsa_switch *ds)
886 {
887 mutex_lock(&dsa2_mutex);
888 dsa_switch_remove(ds);
889 mutex_unlock(&dsa2_mutex);
890 }
891 EXPORT_SYMBOL_GPL(dsa_unregister_switch);