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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);
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 LIST_HEAD(dsa_tree_list);
22static DEFINE_MUTEX(dsa2_mutex);
23
24static const struct devlink_ops dsa_devlink_ops = {
25};
26
27static 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
38static 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
56static void dsa_tree_free(struct dsa_switch_tree *dst)
57{
58 list_del(&dst->list);
59 kfree(dst);
60}
61
62static 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
70static 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
81static 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
90static void dsa_tree_put(struct dsa_switch_tree *dst)
91{
92 if (dst)
93 kref_put(&dst->refcount, dsa_tree_release);
94}
95
96static bool dsa_port_is_dsa(struct dsa_port *port)
97{
98 return port->type == DSA_PORT_TYPE_DSA;
99}
100
101static bool dsa_port_is_cpu(struct dsa_port *port)
102{
103 return port->type == DSA_PORT_TYPE_CPU;
104}
105
106static bool dsa_port_is_user(struct dsa_port *dp)
107{
108 return dp->type == DSA_PORT_TYPE_USER;
109}
110
111static 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
134static 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
156static 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
178static 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
197static 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
219static 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
249static 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
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 *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
340static 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
368static int dsa_switch_setup(struct dsa_switch *ds)
369{
370 int err = 0;
371
372 /* Initialize ds->phys_mii_mask before registering the slave MDIO bus
373 * driver and before ops->setup() has run, since the switch drivers and
374 * the slave MDIO bus driver rely on these values for probing PHY
375 * devices or not
376 */
377 ds->phys_mii_mask |= dsa_user_ports(ds);
378
379 /* Add the switch to devlink before calling setup, so that setup can
380 * add dpipe tables
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
414unregister_notifier:
415 dsa_switch_unregister_notifier(ds);
416unregister_devlink:
417 devlink_unregister(ds->devlink);
418free_devlink:
419 devlink_free(ds->devlink);
420 ds->devlink = NULL;
421
422 return err;
423}
424
425static 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
443static 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 goto ports_teardown;
465 }
466 }
467
468 return 0;
469
470ports_teardown:
471 for (i = 0; i < port; i++)
472 dsa_port_teardown(&ds->ports[i]);
473
474 dsa_switch_teardown(ds);
475
476switch_teardown:
477 for (i = 0; i < device; i++) {
478 ds = dst->ds[i];
479 if (!ds)
480 continue;
481
482 for (port = 0; port < ds->num_ports; port++) {
483 dp = &ds->ports[port];
484
485 dsa_port_teardown(dp);
486 }
487
488 dsa_switch_teardown(ds);
489 }
490
491 return err;
492}
493
494static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
495{
496 struct dsa_switch *ds;
497 struct dsa_port *dp;
498 int device, port;
499
500 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
501 ds = dst->ds[device];
502 if (!ds)
503 continue;
504
505 for (port = 0; port < ds->num_ports; port++) {
506 dp = &ds->ports[port];
507
508 dsa_port_teardown(dp);
509 }
510
511 dsa_switch_teardown(ds);
512 }
513}
514
515static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
516{
517 struct dsa_port *cpu_dp = dst->cpu_dp;
518 struct net_device *master = cpu_dp->master;
519
520 /* DSA currently supports a single pair of CPU port and master device */
521 return dsa_master_setup(master, cpu_dp);
522}
523
524static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
525{
526 struct dsa_port *cpu_dp = dst->cpu_dp;
527 struct net_device *master = cpu_dp->master;
528
529 return dsa_master_teardown(master);
530}
531
532static int dsa_tree_setup(struct dsa_switch_tree *dst)
533{
534 bool complete;
535 int err;
536
537 if (dst->setup) {
538 pr_err("DSA: tree %d already setup! Disjoint trees?\n",
539 dst->index);
540 return -EEXIST;
541 }
542
543 complete = dsa_tree_setup_routing_table(dst);
544 if (!complete)
545 return 0;
546
547 err = dsa_tree_setup_default_cpu(dst);
548 if (err)
549 return err;
550
551 err = dsa_tree_setup_switches(dst);
552 if (err)
553 goto teardown_default_cpu;
554
555 err = dsa_tree_setup_master(dst);
556 if (err)
557 goto teardown_switches;
558
559 dst->setup = true;
560
561 pr_info("DSA: tree %d setup\n", dst->index);
562
563 return 0;
564
565teardown_switches:
566 dsa_tree_teardown_switches(dst);
567teardown_default_cpu:
568 dsa_tree_teardown_default_cpu(dst);
569
570 return err;
571}
572
573static void dsa_tree_teardown(struct dsa_switch_tree *dst)
574{
575 if (!dst->setup)
576 return;
577
578 dsa_tree_teardown_master(dst);
579
580 dsa_tree_teardown_switches(dst);
581
582 dsa_tree_teardown_default_cpu(dst);
583
584 pr_info("DSA: tree %d torn down\n", dst->index);
585
586 dst->setup = false;
587}
588
589static void dsa_tree_remove_switch(struct dsa_switch_tree *dst,
590 unsigned int index)
591{
592 dsa_tree_teardown(dst);
593
594 dst->ds[index] = NULL;
595 dsa_tree_put(dst);
596}
597
598static int dsa_tree_add_switch(struct dsa_switch_tree *dst,
599 struct dsa_switch *ds)
600{
601 unsigned int index = ds->index;
602 int err;
603
604 if (dst->ds[index])
605 return -EBUSY;
606
607 dsa_tree_get(dst);
608 dst->ds[index] = ds;
609
610 err = dsa_tree_setup(dst);
611 if (err) {
612 dst->ds[index] = NULL;
613 dsa_tree_put(dst);
614 }
615
616 return err;
617}
618
619static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
620{
621 if (!name)
622 name = "eth%d";
623
624 dp->type = DSA_PORT_TYPE_USER;
625 dp->name = name;
626
627 return 0;
628}
629
630static int dsa_port_parse_dsa(struct dsa_port *dp)
631{
632 dp->type = DSA_PORT_TYPE_DSA;
633
634 return 0;
635}
636
637static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
638{
639 struct dsa_switch *ds = dp->ds;
640 struct dsa_switch_tree *dst = ds->dst;
641 const struct dsa_device_ops *tag_ops;
642 enum dsa_tag_protocol tag_protocol;
643
644 tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
645 tag_ops = dsa_tag_driver_get(tag_protocol);
646 if (IS_ERR(tag_ops)) {
647 if (PTR_ERR(tag_ops) == -ENOPROTOOPT)
648 return -EPROBE_DEFER;
649 dev_warn(ds->dev, "No tagger for this switch\n");
650 return PTR_ERR(tag_ops);
651 }
652
653 dp->type = DSA_PORT_TYPE_CPU;
654 dp->filter = tag_ops->filter;
655 dp->rcv = tag_ops->rcv;
656 dp->tag_ops = tag_ops;
657 dp->master = master;
658 dp->dst = dst;
659
660 return 0;
661}
662
663static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
664{
665 struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
666 const char *name = of_get_property(dn, "label", NULL);
667 bool link = of_property_read_bool(dn, "link");
668
669 dp->dn = dn;
670
671 if (ethernet) {
672 struct net_device *master;
673
674 master = of_find_net_device_by_node(ethernet);
675 if (!master)
676 return -EPROBE_DEFER;
677
678 return dsa_port_parse_cpu(dp, master);
679 }
680
681 if (link)
682 return dsa_port_parse_dsa(dp);
683
684 return dsa_port_parse_user(dp, name);
685}
686
687static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
688 struct device_node *dn)
689{
690 struct device_node *ports, *port;
691 struct dsa_port *dp;
692 int err = 0;
693 u32 reg;
694
695 ports = of_get_child_by_name(dn, "ports");
696 if (!ports) {
697 dev_err(ds->dev, "no ports child node found\n");
698 return -EINVAL;
699 }
700
701 for_each_available_child_of_node(ports, port) {
702 err = of_property_read_u32(port, "reg", ®);
703 if (err)
704 goto out_put_node;
705
706 if (reg >= ds->num_ports) {
707 err = -EINVAL;
708 goto out_put_node;
709 }
710
711 dp = &ds->ports[reg];
712
713 err = dsa_port_parse_of(dp, port);
714 if (err)
715 goto out_put_node;
716 }
717
718out_put_node:
719 of_node_put(ports);
720 return err;
721}
722
723static int dsa_switch_parse_member_of(struct dsa_switch *ds,
724 struct device_node *dn)
725{
726 u32 m[2] = { 0, 0 };
727 int sz;
728
729 /* Don't error out if this optional property isn't found */
730 sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
731 if (sz < 0 && sz != -EINVAL)
732 return sz;
733
734 ds->index = m[1];
735 if (ds->index >= DSA_MAX_SWITCHES)
736 return -EINVAL;
737
738 ds->dst = dsa_tree_touch(m[0]);
739 if (!ds->dst)
740 return -ENOMEM;
741
742 return 0;
743}
744
745static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
746{
747 int err;
748
749 err = dsa_switch_parse_member_of(ds, dn);
750 if (err)
751 return err;
752
753 return dsa_switch_parse_ports_of(ds, dn);
754}
755
756static int dsa_port_parse(struct dsa_port *dp, const char *name,
757 struct device *dev)
758{
759 if (!strcmp(name, "cpu")) {
760 struct net_device *master;
761
762 master = dsa_dev_to_net_device(dev);
763 if (!master)
764 return -EPROBE_DEFER;
765
766 dev_put(master);
767
768 return dsa_port_parse_cpu(dp, master);
769 }
770
771 if (!strcmp(name, "dsa"))
772 return dsa_port_parse_dsa(dp);
773
774 return dsa_port_parse_user(dp, name);
775}
776
777static int dsa_switch_parse_ports(struct dsa_switch *ds,
778 struct dsa_chip_data *cd)
779{
780 bool valid_name_found = false;
781 struct dsa_port *dp;
782 struct device *dev;
783 const char *name;
784 unsigned int i;
785 int err;
786
787 for (i = 0; i < DSA_MAX_PORTS; i++) {
788 name = cd->port_names[i];
789 dev = cd->netdev[i];
790 dp = &ds->ports[i];
791
792 if (!name)
793 continue;
794
795 err = dsa_port_parse(dp, name, dev);
796 if (err)
797 return err;
798
799 valid_name_found = true;
800 }
801
802 if (!valid_name_found && i == DSA_MAX_PORTS)
803 return -EINVAL;
804
805 return 0;
806}
807
808static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
809{
810 ds->cd = cd;
811
812 /* We don't support interconnected switches nor multiple trees via
813 * platform data, so this is the unique switch of the tree.
814 */
815 ds->index = 0;
816 ds->dst = dsa_tree_touch(0);
817 if (!ds->dst)
818 return -ENOMEM;
819
820 return dsa_switch_parse_ports(ds, cd);
821}
822
823static int dsa_switch_add(struct dsa_switch *ds)
824{
825 struct dsa_switch_tree *dst = ds->dst;
826
827 return dsa_tree_add_switch(dst, ds);
828}
829
830static int dsa_switch_probe(struct dsa_switch *ds)
831{
832 struct dsa_chip_data *pdata = ds->dev->platform_data;
833 struct device_node *np = ds->dev->of_node;
834 int err;
835
836 if (np)
837 err = dsa_switch_parse_of(ds, np);
838 else if (pdata)
839 err = dsa_switch_parse(ds, pdata);
840 else
841 err = -ENODEV;
842
843 if (err)
844 return err;
845
846 return dsa_switch_add(ds);
847}
848
849struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
850{
851 struct dsa_switch *ds;
852 int i;
853
854 ds = devm_kzalloc(dev, struct_size(ds, ports, n), GFP_KERNEL);
855 if (!ds)
856 return NULL;
857
858 ds->dev = dev;
859 ds->num_ports = n;
860
861 for (i = 0; i < ds->num_ports; ++i) {
862 ds->ports[i].index = i;
863 ds->ports[i].ds = ds;
864 }
865
866 return ds;
867}
868EXPORT_SYMBOL_GPL(dsa_switch_alloc);
869
870int dsa_register_switch(struct dsa_switch *ds)
871{
872 int err;
873
874 mutex_lock(&dsa2_mutex);
875 err = dsa_switch_probe(ds);
876 dsa_tree_put(ds->dst);
877 mutex_unlock(&dsa2_mutex);
878
879 return err;
880}
881EXPORT_SYMBOL_GPL(dsa_register_switch);
882
883static void dsa_switch_remove(struct dsa_switch *ds)
884{
885 struct dsa_switch_tree *dst = ds->dst;
886 unsigned int index = ds->index;
887
888 dsa_tree_remove_switch(dst, index);
889}
890
891void dsa_unregister_switch(struct dsa_switch *ds)
892{
893 mutex_lock(&dsa2_mutex);
894 dsa_switch_remove(ds);
895 mutex_unlock(&dsa2_mutex);
896}
897EXPORT_SYMBOL_GPL(dsa_unregister_switch);