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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/*
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/slab.h>
17#include <linux/rtnetlink.h>
18#include <net/dsa.h>
19#include <linux/of.h>
20#include <linux/of_net.h>
21#include "dsa_priv.h"
22
23static LIST_HEAD(dsa_switch_trees);
24static DEFINE_MUTEX(dsa2_mutex);
25
26static struct dsa_switch_tree *dsa_get_dst(u32 tree)
27{
28 struct dsa_switch_tree *dst;
29
30 list_for_each_entry(dst, &dsa_switch_trees, list)
31 if (dst->tree == tree) {
32 kref_get(&dst->refcount);
33 return dst;
34 }
35 return NULL;
36}
37
38static void dsa_free_dst(struct kref *ref)
39{
40 struct dsa_switch_tree *dst = container_of(ref, struct dsa_switch_tree,
41 refcount);
42
43 list_del(&dst->list);
44 kfree(dst);
45}
46
47static void dsa_put_dst(struct dsa_switch_tree *dst)
48{
49 kref_put(&dst->refcount, dsa_free_dst);
50}
51
52static struct dsa_switch_tree *dsa_add_dst(u32 tree)
53{
54 struct dsa_switch_tree *dst;
55
56 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
57 if (!dst)
58 return NULL;
59 dst->tree = tree;
60 dst->cpu_switch = -1;
61 INIT_LIST_HEAD(&dst->list);
62 list_add_tail(&dsa_switch_trees, &dst->list);
63 kref_init(&dst->refcount);
64
65 return dst;
66}
67
68static void dsa_dst_add_ds(struct dsa_switch_tree *dst,
69 struct dsa_switch *ds, u32 index)
70{
71 kref_get(&dst->refcount);
72 dst->ds[index] = ds;
73}
74
75static void dsa_dst_del_ds(struct dsa_switch_tree *dst,
76 struct dsa_switch *ds, u32 index)
77{
78 dst->ds[index] = NULL;
79 kref_put(&dst->refcount, dsa_free_dst);
80}
81
82static bool dsa_port_is_dsa(struct device_node *port)
83{
84 const char *name;
85
86 name = of_get_property(port, "label", NULL);
87 if (!name)
88 return false;
89
90 if (!strcmp(name, "dsa"))
91 return true;
92
93 return false;
94}
95
96static bool dsa_port_is_cpu(struct device_node *port)
97{
98 const char *name;
99
100 name = of_get_property(port, "label", NULL);
101 if (!name)
102 return false;
103
104 if (!strcmp(name, "cpu"))
105 return true;
106
107 return false;
108}
109
110static bool dsa_ds_find_port(struct dsa_switch *ds,
111 struct device_node *port)
112{
113 u32 index;
114
115 for (index = 0; index < DSA_MAX_PORTS; index++)
116 if (ds->ports[index].dn == port)
117 return true;
118 return false;
119}
120
121static struct dsa_switch *dsa_dst_find_port(struct dsa_switch_tree *dst,
122 struct device_node *port)
123{
124 struct dsa_switch *ds;
125 u32 index;
126
127 for (index = 0; index < DSA_MAX_SWITCHES; index++) {
128 ds = dst->ds[index];
129 if (!ds)
130 continue;
131
132 if (dsa_ds_find_port(ds, port))
133 return ds;
134 }
135
136 return NULL;
137}
138
139static int dsa_port_complete(struct dsa_switch_tree *dst,
140 struct dsa_switch *src_ds,
141 struct device_node *port,
142 u32 src_port)
143{
144 struct device_node *link;
145 int index;
146 struct dsa_switch *dst_ds;
147
148 for (index = 0;; index++) {
149 link = of_parse_phandle(port, "link", index);
150 if (!link)
151 break;
152
153 dst_ds = dsa_dst_find_port(dst, link);
154 of_node_put(link);
155
156 if (!dst_ds)
157 return 1;
158
159 src_ds->rtable[dst_ds->index] = src_port;
160 }
161
162 return 0;
163}
164
165/* A switch is complete if all the DSA ports phandles point to ports
166 * known in the tree. A return value of 1 means the tree is not
167 * complete. This is not an error condition. A value of 0 is
168 * success.
169 */
170static int dsa_ds_complete(struct dsa_switch_tree *dst, struct dsa_switch *ds)
171{
172 struct device_node *port;
173 u32 index;
174 int err;
175
176 for (index = 0; index < DSA_MAX_PORTS; index++) {
177 port = ds->ports[index].dn;
178 if (!port)
179 continue;
180
181 if (!dsa_port_is_dsa(port))
182 continue;
183
184 err = dsa_port_complete(dst, ds, port, index);
185 if (err != 0)
186 return err;
187
188 ds->dsa_port_mask |= BIT(index);
189 }
190
191 return 0;
192}
193
194/* A tree is complete if all the DSA ports phandles point to ports
195 * known in the tree. A return value of 1 means the tree is not
196 * complete. This is not an error condition. A value of 0 is
197 * success.
198 */
199static int dsa_dst_complete(struct dsa_switch_tree *dst)
200{
201 struct dsa_switch *ds;
202 u32 index;
203 int err;
204
205 for (index = 0; index < DSA_MAX_SWITCHES; index++) {
206 ds = dst->ds[index];
207 if (!ds)
208 continue;
209
210 err = dsa_ds_complete(dst, ds);
211 if (err != 0)
212 return err;
213 }
214
215 return 0;
216}
217
218static int dsa_dsa_port_apply(struct device_node *port, u32 index,
219 struct dsa_switch *ds)
220{
221 int err;
222
223 err = dsa_cpu_dsa_setup(ds, ds->dev, port, index);
224 if (err) {
225 dev_warn(ds->dev, "Failed to setup dsa port %d: %d\n",
226 index, err);
227 return err;
228 }
229
230 return 0;
231}
232
233static void dsa_dsa_port_unapply(struct device_node *port, u32 index,
234 struct dsa_switch *ds)
235{
236 dsa_cpu_dsa_destroy(port);
237}
238
239static int dsa_cpu_port_apply(struct device_node *port, u32 index,
240 struct dsa_switch *ds)
241{
242 int err;
243
244 err = dsa_cpu_dsa_setup(ds, ds->dev, port, index);
245 if (err) {
246 dev_warn(ds->dev, "Failed to setup cpu port %d: %d\n",
247 index, err);
248 return err;
249 }
250
251 ds->cpu_port_mask |= BIT(index);
252
253 return 0;
254}
255
256static void dsa_cpu_port_unapply(struct device_node *port, u32 index,
257 struct dsa_switch *ds)
258{
259 dsa_cpu_dsa_destroy(port);
260 ds->cpu_port_mask &= ~BIT(index);
261
262}
263
264static int dsa_user_port_apply(struct device_node *port, u32 index,
265 struct dsa_switch *ds)
266{
267 const char *name;
268 int err;
269
270 name = of_get_property(port, "label", NULL);
271
272 err = dsa_slave_create(ds, ds->dev, index, name);
273 if (err) {
274 dev_warn(ds->dev, "Failed to create slave %d: %d\n",
275 index, err);
276 ds->ports[index].netdev = NULL;
277 return err;
278 }
279
280 return 0;
281}
282
283static void dsa_user_port_unapply(struct device_node *port, u32 index,
284 struct dsa_switch *ds)
285{
286 if (ds->ports[index].netdev) {
287 dsa_slave_destroy(ds->ports[index].netdev);
288 ds->ports[index].netdev = NULL;
289 ds->enabled_port_mask &= ~(1 << index);
290 }
291}
292
293static int dsa_ds_apply(struct dsa_switch_tree *dst, struct dsa_switch *ds)
294{
295 struct device_node *port;
296 u32 index;
297 int err;
298
299 /* Initialize ds->phys_mii_mask before registering the slave MDIO bus
300 * driver and before ops->setup() has run, since the switch drivers and
301 * the slave MDIO bus driver rely on these values for probing PHY
302 * devices or not
303 */
304 ds->phys_mii_mask = ds->enabled_port_mask;
305
306 err = ds->ops->setup(ds);
307 if (err < 0)
308 return err;
309
310 if (ds->ops->set_addr) {
311 err = ds->ops->set_addr(ds, dst->master_netdev->dev_addr);
312 if (err < 0)
313 return err;
314 }
315
316 if (!ds->slave_mii_bus && ds->ops->phy_read) {
317 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
318 if (!ds->slave_mii_bus)
319 return -ENOMEM;
320
321 dsa_slave_mii_bus_init(ds);
322
323 err = mdiobus_register(ds->slave_mii_bus);
324 if (err < 0)
325 return err;
326 }
327
328 for (index = 0; index < DSA_MAX_PORTS; index++) {
329 port = ds->ports[index].dn;
330 if (!port)
331 continue;
332
333 if (dsa_port_is_dsa(port)) {
334 err = dsa_dsa_port_apply(port, index, ds);
335 if (err)
336 return err;
337 continue;
338 }
339
340 if (dsa_port_is_cpu(port)) {
341 err = dsa_cpu_port_apply(port, index, ds);
342 if (err)
343 return err;
344 continue;
345 }
346
347 err = dsa_user_port_apply(port, index, ds);
348 if (err)
349 continue;
350 }
351
352 return 0;
353}
354
355static void dsa_ds_unapply(struct dsa_switch_tree *dst, struct dsa_switch *ds)
356{
357 struct device_node *port;
358 u32 index;
359
360 for (index = 0; index < DSA_MAX_PORTS; index++) {
361 port = ds->ports[index].dn;
362 if (!port)
363 continue;
364
365 if (dsa_port_is_dsa(port)) {
366 dsa_dsa_port_unapply(port, index, ds);
367 continue;
368 }
369
370 if (dsa_port_is_cpu(port)) {
371 dsa_cpu_port_unapply(port, index, ds);
372 continue;
373 }
374
375 dsa_user_port_unapply(port, index, ds);
376 }
377
378 if (ds->slave_mii_bus && ds->ops->phy_read)
379 mdiobus_unregister(ds->slave_mii_bus);
380}
381
382static int dsa_dst_apply(struct dsa_switch_tree *dst)
383{
384 struct dsa_switch *ds;
385 u32 index;
386 int err;
387
388 for (index = 0; index < DSA_MAX_SWITCHES; index++) {
389 ds = dst->ds[index];
390 if (!ds)
391 continue;
392
393 err = dsa_ds_apply(dst, ds);
394 if (err)
395 return err;
396 }
397
398 if (dst->ds[0]) {
399 err = dsa_cpu_port_ethtool_setup(dst->ds[0]);
400 if (err)
401 return err;
402 }
403
404 /* If we use a tagging format that doesn't have an ethertype
405 * field, make sure that all packets from this point on get
406 * sent to the tag format's receive function.
407 */
408 wmb();
409 dst->master_netdev->dsa_ptr = (void *)dst;
410 dst->applied = true;
411
412 return 0;
413}
414
415static void dsa_dst_unapply(struct dsa_switch_tree *dst)
416{
417 struct dsa_switch *ds;
418 u32 index;
419
420 if (!dst->applied)
421 return;
422
423 dst->master_netdev->dsa_ptr = NULL;
424
425 /* If we used a tagging format that doesn't have an ethertype
426 * field, make sure that all packets from this point get sent
427 * without the tag and go through the regular receive path.
428 */
429 wmb();
430
431 for (index = 0; index < DSA_MAX_SWITCHES; index++) {
432 ds = dst->ds[index];
433 if (!ds)
434 continue;
435
436 dsa_ds_unapply(dst, ds);
437 }
438
439 if (dst->ds[0])
440 dsa_cpu_port_ethtool_restore(dst->ds[0]);
441
442 pr_info("DSA: tree %d unapplied\n", dst->tree);
443 dst->applied = false;
444}
445
446static int dsa_cpu_parse(struct device_node *port, u32 index,
447 struct dsa_switch_tree *dst,
448 struct dsa_switch *ds)
449{
450 enum dsa_tag_protocol tag_protocol;
451 struct net_device *ethernet_dev;
452 struct device_node *ethernet;
453
454 ethernet = of_parse_phandle(port, "ethernet", 0);
455 if (!ethernet)
456 return -EINVAL;
457
458 ethernet_dev = of_find_net_device_by_node(ethernet);
459 if (!ethernet_dev)
460 return -EPROBE_DEFER;
461
462 if (!ds->master_netdev)
463 ds->master_netdev = ethernet_dev;
464
465 if (!dst->master_netdev)
466 dst->master_netdev = ethernet_dev;
467
468 if (dst->cpu_switch == -1) {
469 dst->cpu_switch = ds->index;
470 dst->cpu_port = index;
471 }
472
473 tag_protocol = ds->ops->get_tag_protocol(ds);
474 dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
475 if (IS_ERR(dst->tag_ops)) {
476 dev_warn(ds->dev, "No tagger for this switch\n");
477 return PTR_ERR(dst->tag_ops);
478 }
479
480 dst->rcv = dst->tag_ops->rcv;
481
482 return 0;
483}
484
485static int dsa_ds_parse(struct dsa_switch_tree *dst, struct dsa_switch *ds)
486{
487 struct device_node *port;
488 u32 index;
489 int err;
490
491 for (index = 0; index < DSA_MAX_PORTS; index++) {
492 port = ds->ports[index].dn;
493 if (!port)
494 continue;
495
496 if (dsa_port_is_cpu(port)) {
497 err = dsa_cpu_parse(port, index, dst, ds);
498 if (err)
499 return err;
500 }
501 }
502
503 pr_info("DSA: switch %d %d parsed\n", dst->tree, ds->index);
504
505 return 0;
506}
507
508static int dsa_dst_parse(struct dsa_switch_tree *dst)
509{
510 struct dsa_switch *ds;
511 u32 index;
512 int err;
513
514 for (index = 0; index < DSA_MAX_SWITCHES; index++) {
515 ds = dst->ds[index];
516 if (!ds)
517 continue;
518
519 err = dsa_ds_parse(dst, ds);
520 if (err)
521 return err;
522 }
523
524 if (!dst->master_netdev) {
525 pr_warn("Tree has no master device\n");
526 return -EINVAL;
527 }
528
529 pr_info("DSA: tree %d parsed\n", dst->tree);
530
531 return 0;
532}
533
534static int dsa_parse_ports_dn(struct device_node *ports, struct dsa_switch *ds)
535{
536 struct device_node *port;
537 int err;
538 u32 reg;
539
540 for_each_available_child_of_node(ports, port) {
541 err = of_property_read_u32(port, "reg", ®);
542 if (err)
543 return err;
544
545 if (reg >= DSA_MAX_PORTS)
546 return -EINVAL;
547
548 ds->ports[reg].dn = port;
549
550 /* Initialize enabled_port_mask now for ops->setup()
551 * to have access to a correct value, just like what
552 * net/dsa/dsa.c::dsa_switch_setup_one does.
553 */
554 if (!dsa_port_is_cpu(port))
555 ds->enabled_port_mask |= 1 << reg;
556 }
557
558 return 0;
559}
560
561static int dsa_parse_member(struct device_node *np, u32 *tree, u32 *index)
562{
563 int err;
564
565 *tree = *index = 0;
566
567 err = of_property_read_u32_index(np, "dsa,member", 0, tree);
568 if (err) {
569 /* Does not exist, but it is optional */
570 if (err == -EINVAL)
571 return 0;
572 return err;
573 }
574
575 err = of_property_read_u32_index(np, "dsa,member", 1, index);
576 if (err)
577 return err;
578
579 if (*index >= DSA_MAX_SWITCHES)
580 return -EINVAL;
581
582 return 0;
583}
584
585static struct device_node *dsa_get_ports(struct dsa_switch *ds,
586 struct device_node *np)
587{
588 struct device_node *ports;
589
590 ports = of_get_child_by_name(np, "ports");
591 if (!ports) {
592 dev_err(ds->dev, "no ports child node found\n");
593 return ERR_PTR(-EINVAL);
594 }
595
596 return ports;
597}
598
599static int _dsa_register_switch(struct dsa_switch *ds, struct device_node *np)
600{
601 struct device_node *ports = dsa_get_ports(ds, np);
602 struct dsa_switch_tree *dst;
603 u32 tree, index;
604 int i, err;
605
606 err = dsa_parse_member(np, &tree, &index);
607 if (err)
608 return err;
609
610 if (IS_ERR(ports))
611 return PTR_ERR(ports);
612
613 err = dsa_parse_ports_dn(ports, ds);
614 if (err)
615 return err;
616
617 dst = dsa_get_dst(tree);
618 if (!dst) {
619 dst = dsa_add_dst(tree);
620 if (!dst)
621 return -ENOMEM;
622 }
623
624 if (dst->ds[index]) {
625 err = -EBUSY;
626 goto out;
627 }
628
629 ds->dst = dst;
630 ds->index = index;
631
632 /* Initialize the routing table */
633 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
634 ds->rtable[i] = DSA_RTABLE_NONE;
635
636 dsa_dst_add_ds(dst, ds, index);
637
638 err = dsa_dst_complete(dst);
639 if (err < 0)
640 goto out_del_dst;
641
642 if (err == 1) {
643 /* Not all switches registered yet */
644 err = 0;
645 goto out;
646 }
647
648 if (dst->applied) {
649 pr_info("DSA: Disjoint trees?\n");
650 return -EINVAL;
651 }
652
653 err = dsa_dst_parse(dst);
654 if (err)
655 goto out_del_dst;
656
657 err = dsa_dst_apply(dst);
658 if (err) {
659 dsa_dst_unapply(dst);
660 goto out_del_dst;
661 }
662
663 dsa_put_dst(dst);
664 return 0;
665
666out_del_dst:
667 dsa_dst_del_ds(dst, ds, ds->index);
668out:
669 dsa_put_dst(dst);
670
671 return err;
672}
673
674int dsa_register_switch(struct dsa_switch *ds, struct device_node *np)
675{
676 int err;
677
678 mutex_lock(&dsa2_mutex);
679 err = _dsa_register_switch(ds, np);
680 mutex_unlock(&dsa2_mutex);
681
682 return err;
683}
684EXPORT_SYMBOL_GPL(dsa_register_switch);
685
686static void _dsa_unregister_switch(struct dsa_switch *ds)
687{
688 struct dsa_switch_tree *dst = ds->dst;
689
690 dsa_dst_unapply(dst);
691
692 dsa_dst_del_ds(dst, ds, ds->index);
693}
694
695void dsa_unregister_switch(struct dsa_switch *ds)
696{
697 mutex_lock(&dsa2_mutex);
698 _dsa_unregister_switch(ds);
699 mutex_unlock(&dsa2_mutex);
700}
701EXPORT_SYMBOL_GPL(dsa_unregister_switch);