Loading...
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);
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 DEFINE_MUTEX(dsa2_mutex);
22LIST_HEAD(dsa_tree_list);
23
24static const struct devlink_ops dsa_devlink_ops = {
25};
26
27struct dsa_switch *dsa_switch_find(int tree_index, int sw_index)
28{
29 struct dsa_switch_tree *dst;
30 struct dsa_port *dp;
31
32 list_for_each_entry(dst, &dsa_tree_list, list) {
33 if (dst->index != tree_index)
34 continue;
35
36 list_for_each_entry(dp, &dst->ports, list) {
37 if (dp->ds->index != sw_index)
38 continue;
39
40 return dp->ds;
41 }
42 }
43
44 return NULL;
45}
46EXPORT_SYMBOL_GPL(dsa_switch_find);
47
48static struct dsa_switch_tree *dsa_tree_find(int index)
49{
50 struct dsa_switch_tree *dst;
51
52 list_for_each_entry(dst, &dsa_tree_list, list)
53 if (dst->index == index)
54 return dst;
55
56 return NULL;
57}
58
59static struct dsa_switch_tree *dsa_tree_alloc(int index)
60{
61 struct dsa_switch_tree *dst;
62
63 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
64 if (!dst)
65 return NULL;
66
67 dst->index = index;
68
69 INIT_LIST_HEAD(&dst->rtable);
70
71 INIT_LIST_HEAD(&dst->ports);
72
73 INIT_LIST_HEAD(&dst->list);
74 list_add_tail(&dst->list, &dsa_tree_list);
75
76 kref_init(&dst->refcount);
77
78 return dst;
79}
80
81static void dsa_tree_free(struct dsa_switch_tree *dst)
82{
83 list_del(&dst->list);
84 kfree(dst);
85}
86
87static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst)
88{
89 if (dst)
90 kref_get(&dst->refcount);
91
92 return dst;
93}
94
95static struct dsa_switch_tree *dsa_tree_touch(int index)
96{
97 struct dsa_switch_tree *dst;
98
99 dst = dsa_tree_find(index);
100 if (dst)
101 return dsa_tree_get(dst);
102 else
103 return dsa_tree_alloc(index);
104}
105
106static void dsa_tree_release(struct kref *ref)
107{
108 struct dsa_switch_tree *dst;
109
110 dst = container_of(ref, struct dsa_switch_tree, refcount);
111
112 dsa_tree_free(dst);
113}
114
115static void dsa_tree_put(struct dsa_switch_tree *dst)
116{
117 if (dst)
118 kref_put(&dst->refcount, dsa_tree_release);
119}
120
121static bool dsa_port_is_dsa(struct dsa_port *port)
122{
123 return port->type == DSA_PORT_TYPE_DSA;
124}
125
126static bool dsa_port_is_cpu(struct dsa_port *port)
127{
128 return port->type == DSA_PORT_TYPE_CPU;
129}
130
131static bool dsa_port_is_user(struct dsa_port *dp)
132{
133 return dp->type == DSA_PORT_TYPE_USER;
134}
135
136static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
137 struct device_node *dn)
138{
139 struct dsa_port *dp;
140
141 list_for_each_entry(dp, &dst->ports, list)
142 if (dp->dn == dn)
143 return dp;
144
145 return NULL;
146}
147
148static struct dsa_link *dsa_link_touch(struct dsa_port *dp,
149 struct dsa_port *link_dp)
150{
151 struct dsa_switch *ds = dp->ds;
152 struct dsa_switch_tree *dst;
153 struct dsa_link *dl;
154
155 dst = ds->dst;
156
157 list_for_each_entry(dl, &dst->rtable, list)
158 if (dl->dp == dp && dl->link_dp == link_dp)
159 return dl;
160
161 dl = kzalloc(sizeof(*dl), GFP_KERNEL);
162 if (!dl)
163 return NULL;
164
165 dl->dp = dp;
166 dl->link_dp = link_dp;
167
168 INIT_LIST_HEAD(&dl->list);
169 list_add_tail(&dl->list, &dst->rtable);
170
171 return dl;
172}
173
174static bool dsa_port_setup_routing_table(struct dsa_port *dp)
175{
176 struct dsa_switch *ds = dp->ds;
177 struct dsa_switch_tree *dst = ds->dst;
178 struct device_node *dn = dp->dn;
179 struct of_phandle_iterator it;
180 struct dsa_port *link_dp;
181 struct dsa_link *dl;
182 int err;
183
184 of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
185 link_dp = dsa_tree_find_port_by_node(dst, it.node);
186 if (!link_dp) {
187 of_node_put(it.node);
188 return false;
189 }
190
191 dl = dsa_link_touch(dp, link_dp);
192 if (!dl) {
193 of_node_put(it.node);
194 return false;
195 }
196 }
197
198 return true;
199}
200
201static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
202{
203 bool complete = true;
204 struct dsa_port *dp;
205
206 list_for_each_entry(dp, &dst->ports, list) {
207 if (dsa_port_is_dsa(dp)) {
208 complete = dsa_port_setup_routing_table(dp);
209 if (!complete)
210 break;
211 }
212 }
213
214 return complete;
215}
216
217static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
218{
219 struct dsa_port *dp;
220
221 list_for_each_entry(dp, &dst->ports, list)
222 if (dsa_port_is_cpu(dp))
223 return dp;
224
225 return NULL;
226}
227
228static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
229{
230 struct dsa_port *cpu_dp, *dp;
231
232 cpu_dp = dsa_tree_find_first_cpu(dst);
233 if (!cpu_dp) {
234 pr_err("DSA: tree %d has no CPU port\n", dst->index);
235 return -EINVAL;
236 }
237
238 /* Assign the default CPU port to all ports of the fabric */
239 list_for_each_entry(dp, &dst->ports, list)
240 if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
241 dp->cpu_dp = cpu_dp;
242
243 return 0;
244}
245
246static void dsa_tree_teardown_default_cpu(struct dsa_switch_tree *dst)
247{
248 struct dsa_port *dp;
249
250 list_for_each_entry(dp, &dst->ports, list)
251 if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
252 dp->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_port_attrs attrs = {};
265 struct devlink *dl = ds->devlink;
266 bool dsa_port_enabled = false;
267 int err = 0;
268
269 attrs.phys.port_number = dp->index;
270 memcpy(attrs.switch_id.id, id, len);
271 attrs.switch_id.id_len = len;
272
273 if (dp->setup)
274 return 0;
275
276 switch (dp->type) {
277 case DSA_PORT_TYPE_UNUSED:
278 dsa_port_disable(dp);
279 break;
280 case DSA_PORT_TYPE_CPU:
281 memset(dlp, 0, sizeof(*dlp));
282 attrs.flavour = DEVLINK_PORT_FLAVOUR_CPU;
283 devlink_port_attrs_set(dlp, &attrs);
284 err = devlink_port_register(dl, dlp, dp->index);
285 if (err)
286 break;
287 devlink_port_registered = true;
288
289 err = dsa_port_link_register_of(dp);
290 if (err)
291 break;
292 dsa_port_link_registered = true;
293
294 err = dsa_port_enable(dp, NULL);
295 if (err)
296 break;
297 dsa_port_enabled = true;
298
299 break;
300 case DSA_PORT_TYPE_DSA:
301 memset(dlp, 0, sizeof(*dlp));
302 attrs.flavour = DEVLINK_PORT_FLAVOUR_DSA;
303 devlink_port_attrs_set(dlp, &attrs);
304 err = devlink_port_register(dl, dlp, dp->index);
305 if (err)
306 break;
307 devlink_port_registered = true;
308
309 err = dsa_port_link_register_of(dp);
310 if (err)
311 break;
312 dsa_port_link_registered = true;
313
314 err = dsa_port_enable(dp, NULL);
315 if (err)
316 break;
317 dsa_port_enabled = true;
318
319 break;
320 case DSA_PORT_TYPE_USER:
321 memset(dlp, 0, sizeof(*dlp));
322 attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
323 devlink_port_attrs_set(dlp, &attrs);
324 err = devlink_port_register(dl, dlp, dp->index);
325 if (err)
326 break;
327 devlink_port_registered = true;
328
329 dp->mac = of_get_mac_address(dp->dn);
330 err = dsa_slave_create(dp);
331 if (err)
332 break;
333
334 devlink_port_type_eth_set(dlp, dp->slave);
335 break;
336 }
337
338 if (err && dsa_port_enabled)
339 dsa_port_disable(dp);
340 if (err && dsa_port_link_registered)
341 dsa_port_link_unregister_of(dp);
342 if (err && devlink_port_registered)
343 devlink_port_unregister(dlp);
344 if (err)
345 return err;
346
347 dp->setup = true;
348
349 return 0;
350}
351
352static void dsa_port_teardown(struct dsa_port *dp)
353{
354 struct devlink_port *dlp = &dp->devlink_port;
355
356 if (!dp->setup)
357 return;
358
359 switch (dp->type) {
360 case DSA_PORT_TYPE_UNUSED:
361 break;
362 case DSA_PORT_TYPE_CPU:
363 dsa_port_disable(dp);
364 dsa_tag_driver_put(dp->tag_ops);
365 devlink_port_unregister(dlp);
366 dsa_port_link_unregister_of(dp);
367 break;
368 case DSA_PORT_TYPE_DSA:
369 dsa_port_disable(dp);
370 devlink_port_unregister(dlp);
371 dsa_port_link_unregister_of(dp);
372 break;
373 case DSA_PORT_TYPE_USER:
374 devlink_port_unregister(dlp);
375 if (dp->slave) {
376 dsa_slave_destroy(dp->slave);
377 dp->slave = NULL;
378 }
379 break;
380 }
381
382 dp->setup = false;
383}
384
385static int dsa_switch_setup(struct dsa_switch *ds)
386{
387 struct dsa_devlink_priv *dl_priv;
388 int err;
389
390 if (ds->setup)
391 return 0;
392
393 /* Initialize ds->phys_mii_mask before registering the slave MDIO bus
394 * driver and before ops->setup() has run, since the switch drivers and
395 * the slave MDIO bus driver rely on these values for probing PHY
396 * devices or not
397 */
398 ds->phys_mii_mask |= dsa_user_ports(ds);
399
400 /* Add the switch to devlink before calling setup, so that setup can
401 * add dpipe tables
402 */
403 ds->devlink = devlink_alloc(&dsa_devlink_ops, sizeof(*dl_priv));
404 if (!ds->devlink)
405 return -ENOMEM;
406 dl_priv = devlink_priv(ds->devlink);
407 dl_priv->ds = ds;
408
409 err = devlink_register(ds->devlink, ds->dev);
410 if (err)
411 goto free_devlink;
412
413 err = dsa_switch_register_notifier(ds);
414 if (err)
415 goto unregister_devlink;
416
417 err = ds->ops->setup(ds);
418 if (err < 0)
419 goto unregister_notifier;
420
421 devlink_params_publish(ds->devlink);
422
423 if (!ds->slave_mii_bus && ds->ops->phy_read) {
424 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
425 if (!ds->slave_mii_bus) {
426 err = -ENOMEM;
427 goto unregister_notifier;
428 }
429
430 dsa_slave_mii_bus_init(ds);
431
432 err = mdiobus_register(ds->slave_mii_bus);
433 if (err < 0)
434 goto unregister_notifier;
435 }
436
437 ds->setup = true;
438
439 return 0;
440
441unregister_notifier:
442 dsa_switch_unregister_notifier(ds);
443unregister_devlink:
444 devlink_unregister(ds->devlink);
445free_devlink:
446 devlink_free(ds->devlink);
447 ds->devlink = NULL;
448
449 return err;
450}
451
452static void dsa_switch_teardown(struct dsa_switch *ds)
453{
454 if (!ds->setup)
455 return;
456
457 if (ds->slave_mii_bus && ds->ops->phy_read)
458 mdiobus_unregister(ds->slave_mii_bus);
459
460 dsa_switch_unregister_notifier(ds);
461
462 if (ds->ops->teardown)
463 ds->ops->teardown(ds);
464
465 if (ds->devlink) {
466 devlink_unregister(ds->devlink);
467 devlink_free(ds->devlink);
468 ds->devlink = NULL;
469 }
470
471 ds->setup = false;
472}
473
474static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
475{
476 struct dsa_port *dp;
477 int err;
478
479 list_for_each_entry(dp, &dst->ports, list) {
480 err = dsa_switch_setup(dp->ds);
481 if (err)
482 goto teardown;
483 }
484
485 list_for_each_entry(dp, &dst->ports, list) {
486 err = dsa_port_setup(dp);
487 if (err)
488 continue;
489 }
490
491 return 0;
492
493teardown:
494 list_for_each_entry(dp, &dst->ports, list)
495 dsa_port_teardown(dp);
496
497 list_for_each_entry(dp, &dst->ports, list)
498 dsa_switch_teardown(dp->ds);
499
500 return err;
501}
502
503static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
504{
505 struct dsa_port *dp;
506
507 list_for_each_entry(dp, &dst->ports, list)
508 dsa_port_teardown(dp);
509
510 list_for_each_entry(dp, &dst->ports, list)
511 dsa_switch_teardown(dp->ds);
512}
513
514static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
515{
516 struct dsa_port *dp;
517 int err;
518
519 list_for_each_entry(dp, &dst->ports, list) {
520 if (dsa_port_is_cpu(dp)) {
521 err = dsa_master_setup(dp->master, dp);
522 if (err)
523 return err;
524 }
525 }
526
527 return 0;
528}
529
530static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
531{
532 struct dsa_port *dp;
533
534 list_for_each_entry(dp, &dst->ports, list)
535 if (dsa_port_is_cpu(dp))
536 dsa_master_teardown(dp->master);
537}
538
539static int dsa_tree_setup(struct dsa_switch_tree *dst)
540{
541 bool complete;
542 int err;
543
544 if (dst->setup) {
545 pr_err("DSA: tree %d already setup! Disjoint trees?\n",
546 dst->index);
547 return -EEXIST;
548 }
549
550 complete = dsa_tree_setup_routing_table(dst);
551 if (!complete)
552 return 0;
553
554 err = dsa_tree_setup_default_cpu(dst);
555 if (err)
556 return err;
557
558 err = dsa_tree_setup_switches(dst);
559 if (err)
560 goto teardown_default_cpu;
561
562 err = dsa_tree_setup_master(dst);
563 if (err)
564 goto teardown_switches;
565
566 dst->setup = true;
567
568 pr_info("DSA: tree %d setup\n", dst->index);
569
570 return 0;
571
572teardown_switches:
573 dsa_tree_teardown_switches(dst);
574teardown_default_cpu:
575 dsa_tree_teardown_default_cpu(dst);
576
577 return err;
578}
579
580static void dsa_tree_teardown(struct dsa_switch_tree *dst)
581{
582 struct dsa_link *dl, *next;
583
584 if (!dst->setup)
585 return;
586
587 dsa_tree_teardown_master(dst);
588
589 dsa_tree_teardown_switches(dst);
590
591 dsa_tree_teardown_default_cpu(dst);
592
593 list_for_each_entry_safe(dl, next, &dst->rtable, list) {
594 list_del(&dl->list);
595 kfree(dl);
596 }
597
598 pr_info("DSA: tree %d torn down\n", dst->index);
599
600 dst->setup = false;
601}
602
603static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index)
604{
605 struct dsa_switch_tree *dst = ds->dst;
606 struct dsa_port *dp;
607
608 list_for_each_entry(dp, &dst->ports, list)
609 if (dp->ds == ds && dp->index == index)
610 return dp;
611
612 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
613 if (!dp)
614 return NULL;
615
616 dp->ds = ds;
617 dp->index = index;
618
619 INIT_LIST_HEAD(&dp->list);
620 list_add_tail(&dp->list, &dst->ports);
621
622 return dp;
623}
624
625static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
626{
627 if (!name)
628 name = "eth%d";
629
630 dp->type = DSA_PORT_TYPE_USER;
631 dp->name = name;
632
633 return 0;
634}
635
636static int dsa_port_parse_dsa(struct dsa_port *dp)
637{
638 dp->type = DSA_PORT_TYPE_DSA;
639
640 return 0;
641}
642
643static enum dsa_tag_protocol dsa_get_tag_protocol(struct dsa_port *dp,
644 struct net_device *master)
645{
646 enum dsa_tag_protocol tag_protocol = DSA_TAG_PROTO_NONE;
647 struct dsa_switch *mds, *ds = dp->ds;
648 unsigned int mdp_upstream;
649 struct dsa_port *mdp;
650
651 /* It is possible to stack DSA switches onto one another when that
652 * happens the switch driver may want to know if its tagging protocol
653 * is going to work in such a configuration.
654 */
655 if (dsa_slave_dev_check(master)) {
656 mdp = dsa_slave_to_port(master);
657 mds = mdp->ds;
658 mdp_upstream = dsa_upstream_port(mds, mdp->index);
659 tag_protocol = mds->ops->get_tag_protocol(mds, mdp_upstream,
660 DSA_TAG_PROTO_NONE);
661 }
662
663 /* If the master device is not itself a DSA slave in a disjoint DSA
664 * tree, then return immediately.
665 */
666 return ds->ops->get_tag_protocol(ds, dp->index, tag_protocol);
667}
668
669static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
670{
671 struct dsa_switch *ds = dp->ds;
672 struct dsa_switch_tree *dst = ds->dst;
673 const struct dsa_device_ops *tag_ops;
674 enum dsa_tag_protocol tag_protocol;
675
676 tag_protocol = dsa_get_tag_protocol(dp, master);
677 tag_ops = dsa_tag_driver_get(tag_protocol);
678 if (IS_ERR(tag_ops)) {
679 if (PTR_ERR(tag_ops) == -ENOPROTOOPT)
680 return -EPROBE_DEFER;
681 dev_warn(ds->dev, "No tagger for this switch\n");
682 dp->master = NULL;
683 return PTR_ERR(tag_ops);
684 }
685
686 dp->master = master;
687 dp->type = DSA_PORT_TYPE_CPU;
688 dp->filter = tag_ops->filter;
689 dp->rcv = tag_ops->rcv;
690 dp->tag_ops = tag_ops;
691 dp->dst = dst;
692
693 return 0;
694}
695
696static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
697{
698 struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
699 const char *name = of_get_property(dn, "label", NULL);
700 bool link = of_property_read_bool(dn, "link");
701
702 dp->dn = dn;
703
704 if (ethernet) {
705 struct net_device *master;
706
707 master = of_find_net_device_by_node(ethernet);
708 if (!master)
709 return -EPROBE_DEFER;
710
711 return dsa_port_parse_cpu(dp, master);
712 }
713
714 if (link)
715 return dsa_port_parse_dsa(dp);
716
717 return dsa_port_parse_user(dp, name);
718}
719
720static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
721 struct device_node *dn)
722{
723 struct device_node *ports, *port;
724 struct dsa_port *dp;
725 int err = 0;
726 u32 reg;
727
728 ports = of_get_child_by_name(dn, "ports");
729 if (!ports) {
730 /* The second possibility is "ethernet-ports" */
731 ports = of_get_child_by_name(dn, "ethernet-ports");
732 if (!ports) {
733 dev_err(ds->dev, "no ports child node found\n");
734 return -EINVAL;
735 }
736 }
737
738 for_each_available_child_of_node(ports, port) {
739 err = of_property_read_u32(port, "reg", ®);
740 if (err)
741 goto out_put_node;
742
743 if (reg >= ds->num_ports) {
744 err = -EINVAL;
745 goto out_put_node;
746 }
747
748 dp = dsa_to_port(ds, reg);
749
750 err = dsa_port_parse_of(dp, port);
751 if (err)
752 goto out_put_node;
753 }
754
755out_put_node:
756 of_node_put(ports);
757 return err;
758}
759
760static int dsa_switch_parse_member_of(struct dsa_switch *ds,
761 struct device_node *dn)
762{
763 u32 m[2] = { 0, 0 };
764 int sz;
765
766 /* Don't error out if this optional property isn't found */
767 sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
768 if (sz < 0 && sz != -EINVAL)
769 return sz;
770
771 ds->index = m[1];
772
773 ds->dst = dsa_tree_touch(m[0]);
774 if (!ds->dst)
775 return -ENOMEM;
776
777 return 0;
778}
779
780static int dsa_switch_touch_ports(struct dsa_switch *ds)
781{
782 struct dsa_port *dp;
783 int port;
784
785 for (port = 0; port < ds->num_ports; port++) {
786 dp = dsa_port_touch(ds, port);
787 if (!dp)
788 return -ENOMEM;
789 }
790
791 return 0;
792}
793
794static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
795{
796 int err;
797
798 err = dsa_switch_parse_member_of(ds, dn);
799 if (err)
800 return err;
801
802 err = dsa_switch_touch_ports(ds);
803 if (err)
804 return err;
805
806 return dsa_switch_parse_ports_of(ds, dn);
807}
808
809static int dsa_port_parse(struct dsa_port *dp, const char *name,
810 struct device *dev)
811{
812 if (!strcmp(name, "cpu")) {
813 struct net_device *master;
814
815 master = dsa_dev_to_net_device(dev);
816 if (!master)
817 return -EPROBE_DEFER;
818
819 dev_put(master);
820
821 return dsa_port_parse_cpu(dp, master);
822 }
823
824 if (!strcmp(name, "dsa"))
825 return dsa_port_parse_dsa(dp);
826
827 return dsa_port_parse_user(dp, name);
828}
829
830static int dsa_switch_parse_ports(struct dsa_switch *ds,
831 struct dsa_chip_data *cd)
832{
833 bool valid_name_found = false;
834 struct dsa_port *dp;
835 struct device *dev;
836 const char *name;
837 unsigned int i;
838 int err;
839
840 for (i = 0; i < DSA_MAX_PORTS; i++) {
841 name = cd->port_names[i];
842 dev = cd->netdev[i];
843 dp = dsa_to_port(ds, i);
844
845 if (!name)
846 continue;
847
848 err = dsa_port_parse(dp, name, dev);
849 if (err)
850 return err;
851
852 valid_name_found = true;
853 }
854
855 if (!valid_name_found && i == DSA_MAX_PORTS)
856 return -EINVAL;
857
858 return 0;
859}
860
861static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
862{
863 int err;
864
865 ds->cd = cd;
866
867 /* We don't support interconnected switches nor multiple trees via
868 * platform data, so this is the unique switch of the tree.
869 */
870 ds->index = 0;
871 ds->dst = dsa_tree_touch(0);
872 if (!ds->dst)
873 return -ENOMEM;
874
875 err = dsa_switch_touch_ports(ds);
876 if (err)
877 return err;
878
879 return dsa_switch_parse_ports(ds, cd);
880}
881
882static void dsa_switch_release_ports(struct dsa_switch *ds)
883{
884 struct dsa_switch_tree *dst = ds->dst;
885 struct dsa_port *dp, *next;
886
887 list_for_each_entry_safe(dp, next, &dst->ports, list) {
888 if (dp->ds != ds)
889 continue;
890 list_del(&dp->list);
891 kfree(dp);
892 }
893}
894
895static int dsa_switch_probe(struct dsa_switch *ds)
896{
897 struct dsa_switch_tree *dst;
898 struct dsa_chip_data *pdata;
899 struct device_node *np;
900 int err;
901
902 if (!ds->dev)
903 return -ENODEV;
904
905 pdata = ds->dev->platform_data;
906 np = ds->dev->of_node;
907
908 if (!ds->num_ports)
909 return -EINVAL;
910
911 if (np) {
912 err = dsa_switch_parse_of(ds, np);
913 if (err)
914 dsa_switch_release_ports(ds);
915 } else if (pdata) {
916 err = dsa_switch_parse(ds, pdata);
917 if (err)
918 dsa_switch_release_ports(ds);
919 } else {
920 err = -ENODEV;
921 }
922
923 if (err)
924 return err;
925
926 dst = ds->dst;
927 dsa_tree_get(dst);
928 err = dsa_tree_setup(dst);
929 if (err) {
930 dsa_switch_release_ports(ds);
931 dsa_tree_put(dst);
932 }
933
934 return err;
935}
936
937int dsa_register_switch(struct dsa_switch *ds)
938{
939 int err;
940
941 mutex_lock(&dsa2_mutex);
942 err = dsa_switch_probe(ds);
943 dsa_tree_put(ds->dst);
944 mutex_unlock(&dsa2_mutex);
945
946 return err;
947}
948EXPORT_SYMBOL_GPL(dsa_register_switch);
949
950static void dsa_switch_remove(struct dsa_switch *ds)
951{
952 struct dsa_switch_tree *dst = ds->dst;
953
954 dsa_tree_teardown(dst);
955 dsa_switch_release_ports(ds);
956 dsa_tree_put(dst);
957}
958
959void dsa_unregister_switch(struct dsa_switch *ds)
960{
961 mutex_lock(&dsa2_mutex);
962 dsa_switch_remove(ds);
963 mutex_unlock(&dsa2_mutex);
964}
965EXPORT_SYMBOL_GPL(dsa_unregister_switch);