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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>
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 /* DSA currently only supports a single CPU port */
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 /* Assign the default CPU port to all ports of the fabric */
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 /* DSA currently only supports a single CPU port */
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 case DSA_PORT_TYPE_DSA:
276 err = dsa_port_link_register_of(dp);
277 if (err) {
278 dev_err(ds->dev, "failed to setup link for port %d.%d\n",
279 ds->index, dp->index);
280 return err;
281 }
282 break;
283 case DSA_PORT_TYPE_USER:
284 err = dsa_slave_create(dp);
285 if (err)
286 dev_err(ds->dev, "failed to create slave for port %d.%d\n",
287 ds->index, dp->index);
288 else
289 devlink_port_type_eth_set(&dp->devlink_port, dp->slave);
290 break;
291 }
292
293 return 0;
294}
295
296static void dsa_port_teardown(struct dsa_port *dp)
297{
298 if (dp->type != DSA_PORT_TYPE_UNUSED)
299 devlink_port_unregister(&dp->devlink_port);
300
301 switch (dp->type) {
302 case DSA_PORT_TYPE_UNUSED:
303 break;
304 case DSA_PORT_TYPE_CPU:
305 case DSA_PORT_TYPE_DSA:
306 dsa_port_link_unregister_of(dp);
307 break;
308 case DSA_PORT_TYPE_USER:
309 if (dp->slave) {
310 dsa_slave_destroy(dp->slave);
311 dp->slave = NULL;
312 }
313 break;
314 }
315}
316
317static int dsa_switch_setup(struct dsa_switch *ds)
318{
319 int err;
320
321 /* Initialize ds->phys_mii_mask before registering the slave MDIO bus
322 * driver and before ops->setup() has run, since the switch drivers and
323 * the slave MDIO bus driver rely on these values for probing PHY
324 * devices or not
325 */
326 ds->phys_mii_mask |= dsa_user_ports(ds);
327
328 /* Add the switch to devlink before calling setup, so that setup can
329 * add dpipe tables
330 */
331 ds->devlink = devlink_alloc(&dsa_devlink_ops, 0);
332 if (!ds->devlink)
333 return -ENOMEM;
334
335 err = devlink_register(ds->devlink, ds->dev);
336 if (err)
337 return err;
338
339 err = ds->ops->setup(ds);
340 if (err < 0)
341 return err;
342
343 err = dsa_switch_register_notifier(ds);
344 if (err)
345 return err;
346
347 if (!ds->slave_mii_bus && ds->ops->phy_read) {
348 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
349 if (!ds->slave_mii_bus)
350 return -ENOMEM;
351
352 dsa_slave_mii_bus_init(ds);
353
354 err = mdiobus_register(ds->slave_mii_bus);
355 if (err < 0)
356 return err;
357 }
358
359 return 0;
360}
361
362static void dsa_switch_teardown(struct dsa_switch *ds)
363{
364 if (ds->slave_mii_bus && ds->ops->phy_read)
365 mdiobus_unregister(ds->slave_mii_bus);
366
367 dsa_switch_unregister_notifier(ds);
368
369 if (ds->devlink) {
370 devlink_unregister(ds->devlink);
371 devlink_free(ds->devlink);
372 ds->devlink = NULL;
373 }
374
375}
376
377static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
378{
379 struct dsa_switch *ds;
380 struct dsa_port *dp;
381 int device, port;
382 int err;
383
384 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
385 ds = dst->ds[device];
386 if (!ds)
387 continue;
388
389 err = dsa_switch_setup(ds);
390 if (err)
391 return err;
392
393 for (port = 0; port < ds->num_ports; port++) {
394 dp = &ds->ports[port];
395
396 err = dsa_port_setup(dp);
397 if (err)
398 return err;
399 }
400 }
401
402 return 0;
403}
404
405static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
406{
407 struct dsa_switch *ds;
408 struct dsa_port *dp;
409 int device, port;
410
411 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
412 ds = dst->ds[device];
413 if (!ds)
414 continue;
415
416 for (port = 0; port < ds->num_ports; port++) {
417 dp = &ds->ports[port];
418
419 dsa_port_teardown(dp);
420 }
421
422 dsa_switch_teardown(ds);
423 }
424}
425
426static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
427{
428 struct dsa_port *cpu_dp = dst->cpu_dp;
429 struct net_device *master = cpu_dp->master;
430
431 /* DSA currently supports a single pair of CPU port and master device */
432 return dsa_master_setup(master, cpu_dp);
433}
434
435static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
436{
437 struct dsa_port *cpu_dp = dst->cpu_dp;
438 struct net_device *master = cpu_dp->master;
439
440 return dsa_master_teardown(master);
441}
442
443static int dsa_tree_setup(struct dsa_switch_tree *dst)
444{
445 bool complete;
446 int err;
447
448 if (dst->setup) {
449 pr_err("DSA: tree %d already setup! Disjoint trees?\n",
450 dst->index);
451 return -EEXIST;
452 }
453
454 complete = dsa_tree_setup_routing_table(dst);
455 if (!complete)
456 return 0;
457
458 err = dsa_tree_setup_default_cpu(dst);
459 if (err)
460 return err;
461
462 err = dsa_tree_setup_switches(dst);
463 if (err)
464 return err;
465
466 err = dsa_tree_setup_master(dst);
467 if (err)
468 return err;
469
470 dst->setup = true;
471
472 pr_info("DSA: tree %d setup\n", dst->index);
473
474 return 0;
475}
476
477static void dsa_tree_teardown(struct dsa_switch_tree *dst)
478{
479 if (!dst->setup)
480 return;
481
482 dsa_tree_teardown_master(dst);
483
484 dsa_tree_teardown_switches(dst);
485
486 dsa_tree_teardown_default_cpu(dst);
487
488 pr_info("DSA: tree %d torn down\n", dst->index);
489
490 dst->setup = false;
491}
492
493static void dsa_tree_remove_switch(struct dsa_switch_tree *dst,
494 unsigned int index)
495{
496 dsa_tree_teardown(dst);
497
498 dst->ds[index] = NULL;
499 dsa_tree_put(dst);
500}
501
502static int dsa_tree_add_switch(struct dsa_switch_tree *dst,
503 struct dsa_switch *ds)
504{
505 unsigned int index = ds->index;
506 int err;
507
508 if (dst->ds[index])
509 return -EBUSY;
510
511 dsa_tree_get(dst);
512 dst->ds[index] = ds;
513
514 err = dsa_tree_setup(dst);
515 if (err)
516 dsa_tree_remove_switch(dst, index);
517
518 return err;
519}
520
521static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
522{
523 if (!name)
524 name = "eth%d";
525
526 dp->type = DSA_PORT_TYPE_USER;
527 dp->name = name;
528
529 return 0;
530}
531
532static int dsa_port_parse_dsa(struct dsa_port *dp)
533{
534 dp->type = DSA_PORT_TYPE_DSA;
535
536 return 0;
537}
538
539static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
540{
541 struct dsa_switch *ds = dp->ds;
542 struct dsa_switch_tree *dst = ds->dst;
543 const struct dsa_device_ops *tag_ops;
544 enum dsa_tag_protocol tag_protocol;
545
546 tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
547 tag_ops = dsa_resolve_tag_protocol(tag_protocol);
548 if (IS_ERR(tag_ops)) {
549 dev_warn(ds->dev, "No tagger for this switch\n");
550 return PTR_ERR(tag_ops);
551 }
552
553 dp->type = DSA_PORT_TYPE_CPU;
554 dp->rcv = tag_ops->rcv;
555 dp->tag_ops = tag_ops;
556 dp->master = master;
557 dp->dst = dst;
558
559 return 0;
560}
561
562static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
563{
564 struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
565 const char *name = of_get_property(dn, "label", NULL);
566 bool link = of_property_read_bool(dn, "link");
567
568 dp->dn = dn;
569
570 if (ethernet) {
571 struct net_device *master;
572
573 master = of_find_net_device_by_node(ethernet);
574 if (!master)
575 return -EPROBE_DEFER;
576
577 return dsa_port_parse_cpu(dp, master);
578 }
579
580 if (link)
581 return dsa_port_parse_dsa(dp);
582
583 return dsa_port_parse_user(dp, name);
584}
585
586static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
587 struct device_node *dn)
588{
589 struct device_node *ports, *port;
590 struct dsa_port *dp;
591 u32 reg;
592 int err;
593
594 ports = of_get_child_by_name(dn, "ports");
595 if (!ports) {
596 dev_err(ds->dev, "no ports child node found\n");
597 return -EINVAL;
598 }
599
600 for_each_available_child_of_node(ports, port) {
601 err = of_property_read_u32(port, "reg", ®);
602 if (err)
603 return err;
604
605 if (reg >= ds->num_ports)
606 return -EINVAL;
607
608 dp = &ds->ports[reg];
609
610 err = dsa_port_parse_of(dp, port);
611 if (err)
612 return err;
613 }
614
615 return 0;
616}
617
618static int dsa_switch_parse_member_of(struct dsa_switch *ds,
619 struct device_node *dn)
620{
621 u32 m[2] = { 0, 0 };
622 int sz;
623
624 /* Don't error out if this optional property isn't found */
625 sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
626 if (sz < 0 && sz != -EINVAL)
627 return sz;
628
629 ds->index = m[1];
630 if (ds->index >= DSA_MAX_SWITCHES)
631 return -EINVAL;
632
633 ds->dst = dsa_tree_touch(m[0]);
634 if (!ds->dst)
635 return -ENOMEM;
636
637 return 0;
638}
639
640static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
641{
642 int err;
643
644 err = dsa_switch_parse_member_of(ds, dn);
645 if (err)
646 return err;
647
648 return dsa_switch_parse_ports_of(ds, dn);
649}
650
651static int dsa_port_parse(struct dsa_port *dp, const char *name,
652 struct device *dev)
653{
654 if (!strcmp(name, "cpu")) {
655 struct net_device *master;
656
657 master = dsa_dev_to_net_device(dev);
658 if (!master)
659 return -EPROBE_DEFER;
660
661 dev_put(master);
662
663 return dsa_port_parse_cpu(dp, master);
664 }
665
666 if (!strcmp(name, "dsa"))
667 return dsa_port_parse_dsa(dp);
668
669 return dsa_port_parse_user(dp, name);
670}
671
672static int dsa_switch_parse_ports(struct dsa_switch *ds,
673 struct dsa_chip_data *cd)
674{
675 bool valid_name_found = false;
676 struct dsa_port *dp;
677 struct device *dev;
678 const char *name;
679 unsigned int i;
680 int err;
681
682 for (i = 0; i < DSA_MAX_PORTS; i++) {
683 name = cd->port_names[i];
684 dev = cd->netdev[i];
685 dp = &ds->ports[i];
686
687 if (!name)
688 continue;
689
690 err = dsa_port_parse(dp, name, dev);
691 if (err)
692 return err;
693
694 valid_name_found = true;
695 }
696
697 if (!valid_name_found && i == DSA_MAX_PORTS)
698 return -EINVAL;
699
700 return 0;
701}
702
703static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
704{
705 ds->cd = cd;
706
707 /* We don't support interconnected switches nor multiple trees via
708 * platform data, so this is the unique switch of the tree.
709 */
710 ds->index = 0;
711 ds->dst = dsa_tree_touch(0);
712 if (!ds->dst)
713 return -ENOMEM;
714
715 return dsa_switch_parse_ports(ds, cd);
716}
717
718static int dsa_switch_add(struct dsa_switch *ds)
719{
720 struct dsa_switch_tree *dst = ds->dst;
721
722 return dsa_tree_add_switch(dst, ds);
723}
724
725static int dsa_switch_probe(struct dsa_switch *ds)
726{
727 struct dsa_chip_data *pdata = ds->dev->platform_data;
728 struct device_node *np = ds->dev->of_node;
729 int err;
730
731 if (np)
732 err = dsa_switch_parse_of(ds, np);
733 else if (pdata)
734 err = dsa_switch_parse(ds, pdata);
735 else
736 err = -ENODEV;
737
738 if (err)
739 return err;
740
741 return dsa_switch_add(ds);
742}
743
744struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
745{
746 size_t size = sizeof(struct dsa_switch) + n * sizeof(struct dsa_port);
747 struct dsa_switch *ds;
748 int i;
749
750 ds = devm_kzalloc(dev, size, GFP_KERNEL);
751 if (!ds)
752 return NULL;
753
754 ds->dev = dev;
755 ds->num_ports = n;
756
757 for (i = 0; i < ds->num_ports; ++i) {
758 ds->ports[i].index = i;
759 ds->ports[i].ds = ds;
760 }
761
762 return ds;
763}
764EXPORT_SYMBOL_GPL(dsa_switch_alloc);
765
766int dsa_register_switch(struct dsa_switch *ds)
767{
768 int err;
769
770 mutex_lock(&dsa2_mutex);
771 err = dsa_switch_probe(ds);
772 dsa_tree_put(ds->dst);
773 mutex_unlock(&dsa2_mutex);
774
775 return err;
776}
777EXPORT_SYMBOL_GPL(dsa_register_switch);
778
779static void dsa_switch_remove(struct dsa_switch *ds)
780{
781 struct dsa_switch_tree *dst = ds->dst;
782 unsigned int index = ds->index;
783
784 dsa_tree_remove_switch(dst, index);
785}
786
787void dsa_unregister_switch(struct dsa_switch *ds)
788{
789 mutex_lock(&dsa2_mutex);
790 dsa_switch_remove(ds);
791 mutex_unlock(&dsa2_mutex);
792}
793EXPORT_SYMBOL_GPL(dsa_unregister_switch);