1
2
3
4
5
6
7
8
9
10
11
12
13#include <linux/device.h>
14#include <linux/err.h>
15#include <linux/list.h>
16#include <linux/netdevice.h>
17#include <linux/slab.h>
18#include <linux/rtnetlink.h>
19#include <linux/of.h>
20#include <linux/of_net.h>
21
22#include "dsa_priv.h"
23
24static LIST_HEAD(dsa_tree_list);
25static DEFINE_MUTEX(dsa2_mutex);
26
27static const struct devlink_ops dsa_devlink_ops = {
28};
29
30static struct dsa_switch_tree *dsa_tree_find(int index)
31{
32 struct dsa_switch_tree *dst;
33
34 list_for_each_entry(dst, &dsa_tree_list, list)
35 if (dst->index == index)
36 return dst;
37
38 return NULL;
39}
40
41static struct dsa_switch_tree *dsa_tree_alloc(int index)
42{
43 struct dsa_switch_tree *dst;
44
45 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
46 if (!dst)
47 return NULL;
48
49 dst->index = index;
50
51 INIT_LIST_HEAD(&dst->list);
52 list_add_tail(&dsa_tree_list, &dst->list);
53
54 kref_init(&dst->refcount);
55
56 return dst;
57}
58
59static void dsa_tree_free(struct dsa_switch_tree *dst)
60{
61 list_del(&dst->list);
62 kfree(dst);
63}
64
65static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst)
66{
67 if (dst)
68 kref_get(&dst->refcount);
69
70 return dst;
71}
72
73static struct dsa_switch_tree *dsa_tree_touch(int index)
74{
75 struct dsa_switch_tree *dst;
76
77 dst = dsa_tree_find(index);
78 if (dst)
79 return dsa_tree_get(dst);
80 else
81 return dsa_tree_alloc(index);
82}
83
84static void dsa_tree_release(struct kref *ref)
85{
86 struct dsa_switch_tree *dst;
87
88 dst = container_of(ref, struct dsa_switch_tree, refcount);
89
90 dsa_tree_free(dst);
91}
92
93static void dsa_tree_put(struct dsa_switch_tree *dst)
94{
95 if (dst)
96 kref_put(&dst->refcount, dsa_tree_release);
97}
98
99static bool dsa_port_is_dsa(struct dsa_port *port)
100{
101 return port->type == DSA_PORT_TYPE_DSA;
102}
103
104static bool dsa_port_is_cpu(struct dsa_port *port)
105{
106 return port->type == DSA_PORT_TYPE_CPU;
107}
108
109static bool dsa_port_is_user(struct dsa_port *dp)
110{
111 return dp->type == DSA_PORT_TYPE_USER;
112}
113
114static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
115 struct device_node *dn)
116{
117 struct dsa_switch *ds;
118 struct dsa_port *dp;
119 int device, port;
120
121 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
122 ds = dst->ds[device];
123 if (!ds)
124 continue;
125
126 for (port = 0; port < ds->num_ports; port++) {
127 dp = &ds->ports[port];
128
129 if (dp->dn == dn)
130 return dp;
131 }
132 }
133
134 return NULL;
135}
136
137static bool dsa_port_setup_routing_table(struct dsa_port *dp)
138{
139 struct dsa_switch *ds = dp->ds;
140 struct dsa_switch_tree *dst = ds->dst;
141 struct device_node *dn = dp->dn;
142 struct of_phandle_iterator it;
143 struct dsa_port *link_dp;
144 int err;
145
146 of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
147 link_dp = dsa_tree_find_port_by_node(dst, it.node);
148 if (!link_dp) {
149 of_node_put(it.node);
150 return false;
151 }
152
153 ds->rtable[link_dp->ds->index] = dp->index;
154 }
155
156 return true;
157}
158
159static bool dsa_switch_setup_routing_table(struct dsa_switch *ds)
160{
161 bool complete = true;
162 struct dsa_port *dp;
163 int i;
164
165 for (i = 0; i < DSA_MAX_SWITCHES; i++)
166 ds->rtable[i] = DSA_RTABLE_NONE;
167
168 for (i = 0; i < ds->num_ports; i++) {
169 dp = &ds->ports[i];
170
171 if (dsa_port_is_dsa(dp)) {
172 complete = dsa_port_setup_routing_table(dp);
173 if (!complete)
174 break;
175 }
176 }
177
178 return complete;
179}
180
181static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
182{
183 struct dsa_switch *ds;
184 bool complete = true;
185 int device;
186
187 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
188 ds = dst->ds[device];
189 if (!ds)
190 continue;
191
192 complete = dsa_switch_setup_routing_table(ds);
193 if (!complete)
194 break;
195 }
196
197 return complete;
198}
199
200static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
201{
202 struct dsa_switch *ds;
203 struct dsa_port *dp;
204 int device, port;
205
206 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
207 ds = dst->ds[device];
208 if (!ds)
209 continue;
210
211 for (port = 0; port < ds->num_ports; port++) {
212 dp = &ds->ports[port];
213
214 if (dsa_port_is_cpu(dp))
215 return dp;
216 }
217 }
218
219 return NULL;
220}
221
222static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
223{
224 struct dsa_switch *ds;
225 struct dsa_port *dp;
226 int device, port;
227
228
229 dst->cpu_dp = dsa_tree_find_first_cpu(dst);
230 if (!dst->cpu_dp) {
231 pr_warn("Tree has no master device\n");
232 return -EINVAL;
233 }
234
235
236 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
237 ds = dst->ds[device];
238 if (!ds)
239 continue;
240
241 for (port = 0; port < ds->num_ports; port++) {
242 dp = &ds->ports[port];
243
244 if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
245 dp->cpu_dp = dst->cpu_dp;
246 }
247 }
248
249 return 0;
250}
251
252static void dsa_tree_teardown_default_cpu(struct dsa_switch_tree *dst)
253{
254
255 dst->cpu_dp = NULL;
256}
257
258static int dsa_port_setup(struct dsa_port *dp)
259{
260 struct dsa_switch *ds = dp->ds;
261 int err = 0;
262
263 memset(&dp->devlink_port, 0, sizeof(dp->devlink_port));
264
265 if (dp->type != DSA_PORT_TYPE_UNUSED)
266 err = devlink_port_register(ds->devlink, &dp->devlink_port,
267 dp->index);
268 if (err)
269 return err;
270
271 switch (dp->type) {
272 case DSA_PORT_TYPE_UNUSED:
273 break;
274 case DSA_PORT_TYPE_CPU:
275
276
277
278
279 devlink_port_attrs_set(&dp->devlink_port,
280 DEVLINK_PORT_FLAVOUR_CPU,
281 dp->index, false, 0);
282 err = dsa_port_link_register_of(dp);
283 if (err) {
284 dev_err(ds->dev, "failed to setup link for port %d.%d\n",
285 ds->index, dp->index);
286 return err;
287 }
288 break;
289 case DSA_PORT_TYPE_DSA:
290
291
292
293
294 devlink_port_attrs_set(&dp->devlink_port,
295 DEVLINK_PORT_FLAVOUR_DSA,
296 dp->index, false, 0);
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 return err;
302 }
303 break;
304 case DSA_PORT_TYPE_USER:
305 devlink_port_attrs_set(&dp->devlink_port,
306 DEVLINK_PORT_FLAVOUR_PHYSICAL,
307 dp->index, false, 0);
308 err = dsa_slave_create(dp);
309 if (err)
310 dev_err(ds->dev, "failed to create slave for port %d.%d\n",
311 ds->index, dp->index);
312 else
313 devlink_port_type_eth_set(&dp->devlink_port, dp->slave);
314 break;
315 }
316
317 return 0;
318}
319
320static void dsa_port_teardown(struct dsa_port *dp)
321{
322 if (dp->type != DSA_PORT_TYPE_UNUSED)
323 devlink_port_unregister(&dp->devlink_port);
324
325 switch (dp->type) {
326 case DSA_PORT_TYPE_UNUSED:
327 break;
328 case DSA_PORT_TYPE_CPU:
329 case DSA_PORT_TYPE_DSA:
330 dsa_port_link_unregister_of(dp);
331 break;
332 case DSA_PORT_TYPE_USER:
333 if (dp->slave) {
334 dsa_slave_destroy(dp->slave);
335 dp->slave = NULL;
336 }
337 break;
338 }
339}
340
341static int dsa_switch_setup(struct dsa_switch *ds)
342{
343 int err;
344
345
346
347
348
349
350 ds->phys_mii_mask |= dsa_user_ports(ds);
351
352
353
354
355 ds->devlink = devlink_alloc(&dsa_devlink_ops, 0);
356 if (!ds->devlink)
357 return -ENOMEM;
358
359 err = devlink_register(ds->devlink, ds->dev);
360 if (err)
361 return err;
362
363 err = ds->ops->setup(ds);
364 if (err < 0)
365 return err;
366
367 err = dsa_switch_register_notifier(ds);
368 if (err)
369 return err;
370
371 if (!ds->slave_mii_bus && ds->ops->phy_read) {
372 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
373 if (!ds->slave_mii_bus)
374 return -ENOMEM;
375
376 dsa_slave_mii_bus_init(ds);
377
378 err = mdiobus_register(ds->slave_mii_bus);
379 if (err < 0)
380 return err;
381 }
382
383 return 0;
384}
385
386static void dsa_switch_teardown(struct dsa_switch *ds)
387{
388 if (ds->slave_mii_bus && ds->ops->phy_read)
389 mdiobus_unregister(ds->slave_mii_bus);
390
391 dsa_switch_unregister_notifier(ds);
392
393 if (ds->devlink) {
394 devlink_unregister(ds->devlink);
395 devlink_free(ds->devlink);
396 ds->devlink = NULL;
397 }
398
399}
400
401static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
402{
403 struct dsa_switch *ds;
404 struct dsa_port *dp;
405 int device, port;
406 int err;
407
408 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
409 ds = dst->ds[device];
410 if (!ds)
411 continue;
412
413 err = dsa_switch_setup(ds);
414 if (err)
415 return err;
416
417 for (port = 0; port < ds->num_ports; port++) {
418 dp = &ds->ports[port];
419
420 err = dsa_port_setup(dp);
421 if (err)
422 return err;
423 }
424 }
425
426 return 0;
427}
428
429static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
430{
431 struct dsa_switch *ds;
432 struct dsa_port *dp;
433 int device, port;
434
435 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
436 ds = dst->ds[device];
437 if (!ds)
438 continue;
439
440 for (port = 0; port < ds->num_ports; port++) {
441 dp = &ds->ports[port];
442
443 dsa_port_teardown(dp);
444 }
445
446 dsa_switch_teardown(ds);
447 }
448}
449
450static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
451{
452 struct dsa_port *cpu_dp = dst->cpu_dp;
453 struct net_device *master = cpu_dp->master;
454
455
456 return dsa_master_setup(master, cpu_dp);
457}
458
459static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
460{
461 struct dsa_port *cpu_dp = dst->cpu_dp;
462 struct net_device *master = cpu_dp->master;
463
464 return dsa_master_teardown(master);
465}
466
467static int dsa_tree_setup(struct dsa_switch_tree *dst)
468{
469 bool complete;
470 int err;
471
472 if (dst->setup) {
473 pr_err("DSA: tree %d already setup! Disjoint trees?\n",
474 dst->index);
475 return -EEXIST;
476 }
477
478 complete = dsa_tree_setup_routing_table(dst);
479 if (!complete)
480 return 0;
481
482 err = dsa_tree_setup_default_cpu(dst);
483 if (err)
484 return err;
485
486 err = dsa_tree_setup_switches(dst);
487 if (err)
488 return err;
489
490 err = dsa_tree_setup_master(dst);
491 if (err)
492 return err;
493
494 dst->setup = true;
495
496 pr_info("DSA: tree %d setup\n", dst->index);
497
498 return 0;
499}
500
501static void dsa_tree_teardown(struct dsa_switch_tree *dst)
502{
503 if (!dst->setup)
504 return;
505
506 dsa_tree_teardown_master(dst);
507
508 dsa_tree_teardown_switches(dst);
509
510 dsa_tree_teardown_default_cpu(dst);
511
512 pr_info("DSA: tree %d torn down\n", dst->index);
513
514 dst->setup = false;
515}
516
517static void dsa_tree_remove_switch(struct dsa_switch_tree *dst,
518 unsigned int index)
519{
520 dsa_tree_teardown(dst);
521
522 dst->ds[index] = NULL;
523 dsa_tree_put(dst);
524}
525
526static int dsa_tree_add_switch(struct dsa_switch_tree *dst,
527 struct dsa_switch *ds)
528{
529 unsigned int index = ds->index;
530 int err;
531
532 if (dst->ds[index])
533 return -EBUSY;
534
535 dsa_tree_get(dst);
536 dst->ds[index] = ds;
537
538 err = dsa_tree_setup(dst);
539 if (err)
540 dsa_tree_remove_switch(dst, index);
541
542 return err;
543}
544
545static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
546{
547 if (!name)
548 name = "eth%d";
549
550 dp->type = DSA_PORT_TYPE_USER;
551 dp->name = name;
552
553 return 0;
554}
555
556static int dsa_port_parse_dsa(struct dsa_port *dp)
557{
558 dp->type = DSA_PORT_TYPE_DSA;
559
560 return 0;
561}
562
563static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
564{
565 struct dsa_switch *ds = dp->ds;
566 struct dsa_switch_tree *dst = ds->dst;
567 const struct dsa_device_ops *tag_ops;
568 enum dsa_tag_protocol tag_protocol;
569
570 tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
571 tag_ops = dsa_resolve_tag_protocol(tag_protocol);
572 if (IS_ERR(tag_ops)) {
573 dev_warn(ds->dev, "No tagger for this switch\n");
574 return PTR_ERR(tag_ops);
575 }
576
577 dp->type = DSA_PORT_TYPE_CPU;
578 dp->rcv = tag_ops->rcv;
579 dp->tag_ops = tag_ops;
580 dp->master = master;
581 dp->dst = dst;
582
583 return 0;
584}
585
586static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
587{
588 struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
589 const char *name = of_get_property(dn, "label", NULL);
590 bool link = of_property_read_bool(dn, "link");
591
592 dp->dn = dn;
593
594 if (ethernet) {
595 struct net_device *master;
596
597 master = of_find_net_device_by_node(ethernet);
598 if (!master)
599 return -EPROBE_DEFER;
600
601 return dsa_port_parse_cpu(dp, master);
602 }
603
604 if (link)
605 return dsa_port_parse_dsa(dp);
606
607 return dsa_port_parse_user(dp, name);
608}
609
610static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
611 struct device_node *dn)
612{
613 struct device_node *ports, *port;
614 struct dsa_port *dp;
615 u32 reg;
616 int err;
617
618 ports = of_get_child_by_name(dn, "ports");
619 if (!ports) {
620 dev_err(ds->dev, "no ports child node found\n");
621 return -EINVAL;
622 }
623
624 for_each_available_child_of_node(ports, port) {
625 err = of_property_read_u32(port, "reg", ®);
626 if (err)
627 return err;
628
629 if (reg >= ds->num_ports)
630 return -EINVAL;
631
632 dp = &ds->ports[reg];
633
634 err = dsa_port_parse_of(dp, port);
635 if (err)
636 return err;
637 }
638
639 return 0;
640}
641
642static int dsa_switch_parse_member_of(struct dsa_switch *ds,
643 struct device_node *dn)
644{
645 u32 m[2] = { 0, 0 };
646 int sz;
647
648
649 sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
650 if (sz < 0 && sz != -EINVAL)
651 return sz;
652
653 ds->index = m[1];
654 if (ds->index >= DSA_MAX_SWITCHES)
655 return -EINVAL;
656
657 ds->dst = dsa_tree_touch(m[0]);
658 if (!ds->dst)
659 return -ENOMEM;
660
661 return 0;
662}
663
664static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
665{
666 int err;
667
668 err = dsa_switch_parse_member_of(ds, dn);
669 if (err)
670 return err;
671
672 return dsa_switch_parse_ports_of(ds, dn);
673}
674
675static int dsa_port_parse(struct dsa_port *dp, const char *name,
676 struct device *dev)
677{
678 if (!strcmp(name, "cpu")) {
679 struct net_device *master;
680
681 master = dsa_dev_to_net_device(dev);
682 if (!master)
683 return -EPROBE_DEFER;
684
685 dev_put(master);
686
687 return dsa_port_parse_cpu(dp, master);
688 }
689
690 if (!strcmp(name, "dsa"))
691 return dsa_port_parse_dsa(dp);
692
693 return dsa_port_parse_user(dp, name);
694}
695
696static int dsa_switch_parse_ports(struct dsa_switch *ds,
697 struct dsa_chip_data *cd)
698{
699 bool valid_name_found = false;
700 struct dsa_port *dp;
701 struct device *dev;
702 const char *name;
703 unsigned int i;
704 int err;
705
706 for (i = 0; i < DSA_MAX_PORTS; i++) {
707 name = cd->port_names[i];
708 dev = cd->netdev[i];
709 dp = &ds->ports[i];
710
711 if (!name)
712 continue;
713
714 err = dsa_port_parse(dp, name, dev);
715 if (err)
716 return err;
717
718 valid_name_found = true;
719 }
720
721 if (!valid_name_found && i == DSA_MAX_PORTS)
722 return -EINVAL;
723
724 return 0;
725}
726
727static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
728{
729 ds->cd = cd;
730
731
732
733
734 ds->index = 0;
735 ds->dst = dsa_tree_touch(0);
736 if (!ds->dst)
737 return -ENOMEM;
738
739 return dsa_switch_parse_ports(ds, cd);
740}
741
742static int dsa_switch_add(struct dsa_switch *ds)
743{
744 struct dsa_switch_tree *dst = ds->dst;
745
746 return dsa_tree_add_switch(dst, ds);
747}
748
749static int dsa_switch_probe(struct dsa_switch *ds)
750{
751 struct dsa_chip_data *pdata = ds->dev->platform_data;
752 struct device_node *np = ds->dev->of_node;
753 int err;
754
755 if (np)
756 err = dsa_switch_parse_of(ds, np);
757 else if (pdata)
758 err = dsa_switch_parse(ds, pdata);
759 else
760 err = -ENODEV;
761
762 if (err)
763 return err;
764
765 return dsa_switch_add(ds);
766}
767
768struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
769{
770 size_t size = sizeof(struct dsa_switch) + n * sizeof(struct dsa_port);
771 struct dsa_switch *ds;
772 int i;
773
774 ds = devm_kzalloc(dev, size, GFP_KERNEL);
775 if (!ds)
776 return NULL;
777
778
779
780
781 if (n <= sizeof(ds->_bitmap) * 8) {
782 ds->bitmap = &ds->_bitmap;
783 } else {
784 ds->bitmap = devm_kcalloc(dev,
785 BITS_TO_LONGS(n),
786 sizeof(unsigned long),
787 GFP_KERNEL);
788 if (unlikely(!ds->bitmap))
789 return NULL;
790 }
791
792 ds->dev = dev;
793 ds->num_ports = n;
794
795 for (i = 0; i < ds->num_ports; ++i) {
796 ds->ports[i].index = i;
797 ds->ports[i].ds = ds;
798 }
799
800 return ds;
801}
802EXPORT_SYMBOL_GPL(dsa_switch_alloc);
803
804int dsa_register_switch(struct dsa_switch *ds)
805{
806 int err;
807
808 mutex_lock(&dsa2_mutex);
809 err = dsa_switch_probe(ds);
810 dsa_tree_put(ds->dst);
811 mutex_unlock(&dsa2_mutex);
812
813 return err;
814}
815EXPORT_SYMBOL_GPL(dsa_register_switch);
816
817static void dsa_switch_remove(struct dsa_switch *ds)
818{
819 struct dsa_switch_tree *dst = ds->dst;
820 unsigned int index = ds->index;
821
822 dsa_tree_remove_switch(dst, index);
823}
824
825void dsa_unregister_switch(struct dsa_switch *ds)
826{
827 mutex_lock(&dsa2_mutex);
828 dsa_switch_remove(ds);
829 mutex_unlock(&dsa2_mutex);
830}
831EXPORT_SYMBOL_GPL(dsa_unregister_switch);
832
