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Merge tag 'pm-6.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
[linux-2.6-block.git] / net / dsa / dsa.c
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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * DSA topology and switch handling
4 *
5 * Copyright (c) 2008-2009 Marvell Semiconductor
6 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
7 * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
8 */
9
10#include <linux/device.h>
11#include <linux/err.h>
12#include <linux/list.h>
13#include <linux/module.h>
14#include <linux/netdevice.h>
15#include <linux/slab.h>
16#include <linux/rtnetlink.h>
17#include <linux/of.h>
18#include <linux/of_net.h>
19#include <net/dsa_stubs.h>
20#include <net/sch_generic.h>
21
22#include "conduit.h"
23#include "devlink.h"
24#include "dsa.h"
25#include "netlink.h"
26#include "port.h"
27#include "switch.h"
28#include "tag.h"
29#include "user.h"
30
31#define DSA_MAX_NUM_OFFLOADING_BRIDGES BITS_PER_LONG
32
33static DEFINE_MUTEX(dsa2_mutex);
34LIST_HEAD(dsa_tree_list);
35
36static struct workqueue_struct *dsa_owq;
37
38/* Track the bridges with forwarding offload enabled */
39static unsigned long dsa_fwd_offloading_bridges;
40
41bool dsa_schedule_work(struct work_struct *work)
42{
43 return queue_work(dsa_owq, work);
44}
45
46void dsa_flush_workqueue(void)
47{
48 flush_workqueue(dsa_owq);
49}
50EXPORT_SYMBOL_GPL(dsa_flush_workqueue);
51
52/**
53 * dsa_lag_map() - Map LAG structure to a linear LAG array
54 * @dst: Tree in which to record the mapping.
55 * @lag: LAG structure that is to be mapped to the tree's array.
56 *
57 * dsa_lag_id/dsa_lag_by_id can then be used to translate between the
58 * two spaces. The size of the mapping space is determined by the
59 * driver by setting ds->num_lag_ids. It is perfectly legal to leave
60 * it unset if it is not needed, in which case these functions become
61 * no-ops.
62 */
63void dsa_lag_map(struct dsa_switch_tree *dst, struct dsa_lag *lag)
64{
65 unsigned int id;
66
67 for (id = 1; id <= dst->lags_len; id++) {
68 if (!dsa_lag_by_id(dst, id)) {
69 dst->lags[id - 1] = lag;
70 lag->id = id;
71 return;
72 }
73 }
74
75 /* No IDs left, which is OK. Some drivers do not need it. The
76 * ones that do, e.g. mv88e6xxx, will discover that dsa_lag_id
77 * returns an error for this device when joining the LAG. The
78 * driver can then return -EOPNOTSUPP back to DSA, which will
79 * fall back to a software LAG.
80 */
81}
82
83/**
84 * dsa_lag_unmap() - Remove a LAG ID mapping
85 * @dst: Tree in which the mapping is recorded.
86 * @lag: LAG structure that was mapped.
87 *
88 * As there may be multiple users of the mapping, it is only removed
89 * if there are no other references to it.
90 */
91void dsa_lag_unmap(struct dsa_switch_tree *dst, struct dsa_lag *lag)
92{
93 unsigned int id;
94
95 dsa_lags_foreach_id(id, dst) {
96 if (dsa_lag_by_id(dst, id) == lag) {
97 dst->lags[id - 1] = NULL;
98 lag->id = 0;
99 break;
100 }
101 }
102}
103
104struct dsa_lag *dsa_tree_lag_find(struct dsa_switch_tree *dst,
105 const struct net_device *lag_dev)
106{
107 struct dsa_port *dp;
108
109 list_for_each_entry(dp, &dst->ports, list)
110 if (dsa_port_lag_dev_get(dp) == lag_dev)
111 return dp->lag;
112
113 return NULL;
114}
115
116struct dsa_bridge *dsa_tree_bridge_find(struct dsa_switch_tree *dst,
117 const struct net_device *br)
118{
119 struct dsa_port *dp;
120
121 list_for_each_entry(dp, &dst->ports, list)
122 if (dsa_port_bridge_dev_get(dp) == br)
123 return dp->bridge;
124
125 return NULL;
126}
127
128static int dsa_bridge_num_find(const struct net_device *bridge_dev)
129{
130 struct dsa_switch_tree *dst;
131
132 list_for_each_entry(dst, &dsa_tree_list, list) {
133 struct dsa_bridge *bridge;
134
135 bridge = dsa_tree_bridge_find(dst, bridge_dev);
136 if (bridge)
137 return bridge->num;
138 }
139
140 return 0;
141}
142
143unsigned int dsa_bridge_num_get(const struct net_device *bridge_dev, int max)
144{
145 unsigned int bridge_num = dsa_bridge_num_find(bridge_dev);
146
147 /* Switches without FDB isolation support don't get unique
148 * bridge numbering
149 */
150 if (!max)
151 return 0;
152
153 if (!bridge_num) {
154 /* First port that requests FDB isolation or TX forwarding
155 * offload for this bridge
156 */
157 bridge_num = find_next_zero_bit(&dsa_fwd_offloading_bridges,
158 DSA_MAX_NUM_OFFLOADING_BRIDGES,
159 1);
160 if (bridge_num >= max)
161 return 0;
162
163 set_bit(bridge_num, &dsa_fwd_offloading_bridges);
164 }
165
166 return bridge_num;
167}
168
169void dsa_bridge_num_put(const struct net_device *bridge_dev,
170 unsigned int bridge_num)
171{
172 /* Since we refcount bridges, we know that when we call this function
173 * it is no longer in use, so we can just go ahead and remove it from
174 * the bit mask.
175 */
176 clear_bit(bridge_num, &dsa_fwd_offloading_bridges);
177}
178
179struct dsa_switch *dsa_switch_find(int tree_index, int sw_index)
180{
181 struct dsa_switch_tree *dst;
182 struct dsa_port *dp;
183
184 list_for_each_entry(dst, &dsa_tree_list, list) {
185 if (dst->index != tree_index)
186 continue;
187
188 list_for_each_entry(dp, &dst->ports, list) {
189 if (dp->ds->index != sw_index)
190 continue;
191
192 return dp->ds;
193 }
194 }
195
196 return NULL;
197}
198EXPORT_SYMBOL_GPL(dsa_switch_find);
199
200static struct dsa_switch_tree *dsa_tree_find(int index)
201{
202 struct dsa_switch_tree *dst;
203
204 list_for_each_entry(dst, &dsa_tree_list, list)
205 if (dst->index == index)
206 return dst;
207
208 return NULL;
209}
210
211static struct dsa_switch_tree *dsa_tree_alloc(int index)
212{
213 struct dsa_switch_tree *dst;
214
215 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
216 if (!dst)
217 return NULL;
218
219 dst->index = index;
220
221 INIT_LIST_HEAD(&dst->rtable);
222
223 INIT_LIST_HEAD(&dst->ports);
224
225 INIT_LIST_HEAD(&dst->list);
226 list_add_tail(&dst->list, &dsa_tree_list);
227
228 kref_init(&dst->refcount);
229
230 return dst;
231}
232
233static void dsa_tree_free(struct dsa_switch_tree *dst)
234{
235 if (dst->tag_ops)
236 dsa_tag_driver_put(dst->tag_ops);
237 list_del(&dst->list);
238 kfree(dst);
239}
240
241static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst)
242{
243 if (dst)
244 kref_get(&dst->refcount);
245
246 return dst;
247}
248
249static struct dsa_switch_tree *dsa_tree_touch(int index)
250{
251 struct dsa_switch_tree *dst;
252
253 dst = dsa_tree_find(index);
254 if (dst)
255 return dsa_tree_get(dst);
256 else
257 return dsa_tree_alloc(index);
258}
259
260static void dsa_tree_release(struct kref *ref)
261{
262 struct dsa_switch_tree *dst;
263
264 dst = container_of(ref, struct dsa_switch_tree, refcount);
265
266 dsa_tree_free(dst);
267}
268
269static void dsa_tree_put(struct dsa_switch_tree *dst)
270{
271 if (dst)
272 kref_put(&dst->refcount, dsa_tree_release);
273}
274
275static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
276 struct device_node *dn)
277{
278 struct dsa_port *dp;
279
280 list_for_each_entry(dp, &dst->ports, list)
281 if (dp->dn == dn)
282 return dp;
283
284 return NULL;
285}
286
287static struct dsa_link *dsa_link_touch(struct dsa_port *dp,
288 struct dsa_port *link_dp)
289{
290 struct dsa_switch *ds = dp->ds;
291 struct dsa_switch_tree *dst;
292 struct dsa_link *dl;
293
294 dst = ds->dst;
295
296 list_for_each_entry(dl, &dst->rtable, list)
297 if (dl->dp == dp && dl->link_dp == link_dp)
298 return dl;
299
300 dl = kzalloc(sizeof(*dl), GFP_KERNEL);
301 if (!dl)
302 return NULL;
303
304 dl->dp = dp;
305 dl->link_dp = link_dp;
306
307 INIT_LIST_HEAD(&dl->list);
308 list_add_tail(&dl->list, &dst->rtable);
309
310 return dl;
311}
312
313static bool dsa_port_setup_routing_table(struct dsa_port *dp)
314{
315 struct dsa_switch *ds = dp->ds;
316 struct dsa_switch_tree *dst = ds->dst;
317 struct device_node *dn = dp->dn;
318 struct of_phandle_iterator it;
319 struct dsa_port *link_dp;
320 struct dsa_link *dl;
321 int err;
322
323 of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
324 link_dp = dsa_tree_find_port_by_node(dst, it.node);
325 if (!link_dp) {
326 of_node_put(it.node);
327 return false;
328 }
329
330 dl = dsa_link_touch(dp, link_dp);
331 if (!dl) {
332 of_node_put(it.node);
333 return false;
334 }
335 }
336
337 return true;
338}
339
340static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
341{
342 bool complete = true;
343 struct dsa_port *dp;
344
345 list_for_each_entry(dp, &dst->ports, list) {
346 if (dsa_port_is_dsa(dp)) {
347 complete = dsa_port_setup_routing_table(dp);
348 if (!complete)
349 break;
350 }
351 }
352
353 return complete;
354}
355
356static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
357{
358 struct dsa_port *dp;
359
360 list_for_each_entry(dp, &dst->ports, list)
361 if (dsa_port_is_cpu(dp))
362 return dp;
363
364 return NULL;
365}
366
367struct net_device *dsa_tree_find_first_conduit(struct dsa_switch_tree *dst)
368{
369 struct device_node *ethernet;
370 struct net_device *conduit;
371 struct dsa_port *cpu_dp;
372
373 cpu_dp = dsa_tree_find_first_cpu(dst);
374 ethernet = of_parse_phandle(cpu_dp->dn, "ethernet", 0);
375 conduit = of_find_net_device_by_node(ethernet);
376 of_node_put(ethernet);
377
378 return conduit;
379}
380
381/* Assign the default CPU port (the first one in the tree) to all ports of the
382 * fabric which don't already have one as part of their own switch.
383 */
384static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
385{
386 struct dsa_port *cpu_dp, *dp;
387
388 cpu_dp = dsa_tree_find_first_cpu(dst);
389 if (!cpu_dp) {
390 pr_err("DSA: tree %d has no CPU port\n", dst->index);
391 return -EINVAL;
392 }
393
394 list_for_each_entry(dp, &dst->ports, list) {
395 if (dp->cpu_dp)
396 continue;
397
398 if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
399 dp->cpu_dp = cpu_dp;
400 }
401
402 return 0;
403}
404
405static struct dsa_port *
406dsa_switch_preferred_default_local_cpu_port(struct dsa_switch *ds)
407{
408 struct dsa_port *cpu_dp;
409
410 if (!ds->ops->preferred_default_local_cpu_port)
411 return NULL;
412
413 cpu_dp = ds->ops->preferred_default_local_cpu_port(ds);
414 if (!cpu_dp)
415 return NULL;
416
417 if (WARN_ON(!dsa_port_is_cpu(cpu_dp) || cpu_dp->ds != ds))
418 return NULL;
419
420 return cpu_dp;
421}
422
423/* Perform initial assignment of CPU ports to user ports and DSA links in the
424 * fabric, giving preference to CPU ports local to each switch. Default to
425 * using the first CPU port in the switch tree if the port does not have a CPU
426 * port local to this switch.
427 */
428static int dsa_tree_setup_cpu_ports(struct dsa_switch_tree *dst)
429{
430 struct dsa_port *preferred_cpu_dp, *cpu_dp, *dp;
431
432 list_for_each_entry(cpu_dp, &dst->ports, list) {
433 if (!dsa_port_is_cpu(cpu_dp))
434 continue;
435
436 preferred_cpu_dp = dsa_switch_preferred_default_local_cpu_port(cpu_dp->ds);
437 if (preferred_cpu_dp && preferred_cpu_dp != cpu_dp)
438 continue;
439
440 /* Prefer a local CPU port */
441 dsa_switch_for_each_port(dp, cpu_dp->ds) {
442 /* Prefer the first local CPU port found */
443 if (dp->cpu_dp)
444 continue;
445
446 if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
447 dp->cpu_dp = cpu_dp;
448 }
449 }
450
451 return dsa_tree_setup_default_cpu(dst);
452}
453
454static void dsa_tree_teardown_cpu_ports(struct dsa_switch_tree *dst)
455{
456 struct dsa_port *dp;
457
458 list_for_each_entry(dp, &dst->ports, list)
459 if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
460 dp->cpu_dp = NULL;
461}
462
463static int dsa_port_setup(struct dsa_port *dp)
464{
465 bool dsa_port_link_registered = false;
466 struct dsa_switch *ds = dp->ds;
467 bool dsa_port_enabled = false;
468 int err = 0;
469
470 if (dp->setup)
471 return 0;
472
473 err = dsa_port_devlink_setup(dp);
474 if (err)
475 return err;
476
477 switch (dp->type) {
478 case DSA_PORT_TYPE_UNUSED:
479 dsa_port_disable(dp);
480 break;
481 case DSA_PORT_TYPE_CPU:
482 if (dp->dn) {
483 err = dsa_shared_port_link_register_of(dp);
484 if (err)
485 break;
486 dsa_port_link_registered = true;
487 } else {
488 dev_warn(ds->dev,
489 "skipping link registration for CPU port %d\n",
490 dp->index);
491 }
492
493 err = dsa_port_enable(dp, NULL);
494 if (err)
495 break;
496 dsa_port_enabled = true;
497
498 break;
499 case DSA_PORT_TYPE_DSA:
500 if (dp->dn) {
501 err = dsa_shared_port_link_register_of(dp);
502 if (err)
503 break;
504 dsa_port_link_registered = true;
505 } else {
506 dev_warn(ds->dev,
507 "skipping link registration for DSA port %d\n",
508 dp->index);
509 }
510
511 err = dsa_port_enable(dp, NULL);
512 if (err)
513 break;
514 dsa_port_enabled = true;
515
516 break;
517 case DSA_PORT_TYPE_USER:
518 of_get_mac_address(dp->dn, dp->mac);
519 err = dsa_user_create(dp);
520 break;
521 }
522
523 if (err && dsa_port_enabled)
524 dsa_port_disable(dp);
525 if (err && dsa_port_link_registered)
526 dsa_shared_port_link_unregister_of(dp);
527 if (err) {
528 dsa_port_devlink_teardown(dp);
529 return err;
530 }
531
532 dp->setup = true;
533
534 return 0;
535}
536
537static void dsa_port_teardown(struct dsa_port *dp)
538{
539 if (!dp->setup)
540 return;
541
542 switch (dp->type) {
543 case DSA_PORT_TYPE_UNUSED:
544 break;
545 case DSA_PORT_TYPE_CPU:
546 dsa_port_disable(dp);
547 if (dp->dn)
548 dsa_shared_port_link_unregister_of(dp);
549 break;
550 case DSA_PORT_TYPE_DSA:
551 dsa_port_disable(dp);
552 if (dp->dn)
553 dsa_shared_port_link_unregister_of(dp);
554 break;
555 case DSA_PORT_TYPE_USER:
556 if (dp->user) {
557 dsa_user_destroy(dp->user);
558 dp->user = NULL;
559 }
560 break;
561 }
562
563 dsa_port_devlink_teardown(dp);
564
565 dp->setup = false;
566}
567
568static int dsa_port_setup_as_unused(struct dsa_port *dp)
569{
570 dp->type = DSA_PORT_TYPE_UNUSED;
571 return dsa_port_setup(dp);
572}
573
574static int dsa_switch_setup_tag_protocol(struct dsa_switch *ds)
575{
576 const struct dsa_device_ops *tag_ops = ds->dst->tag_ops;
577 struct dsa_switch_tree *dst = ds->dst;
578 int err;
579
580 if (tag_ops->proto == dst->default_proto)
581 goto connect;
582
583 rtnl_lock();
584 err = ds->ops->change_tag_protocol(ds, tag_ops->proto);
585 rtnl_unlock();
586 if (err) {
587 dev_err(ds->dev, "Unable to use tag protocol \"%s\": %pe\n",
588 tag_ops->name, ERR_PTR(err));
589 return err;
590 }
591
592connect:
593 if (tag_ops->connect) {
594 err = tag_ops->connect(ds);
595 if (err)
596 return err;
597 }
598
599 if (ds->ops->connect_tag_protocol) {
600 err = ds->ops->connect_tag_protocol(ds, tag_ops->proto);
601 if (err) {
602 dev_err(ds->dev,
603 "Unable to connect to tag protocol \"%s\": %pe\n",
604 tag_ops->name, ERR_PTR(err));
605 goto disconnect;
606 }
607 }
608
609 return 0;
610
611disconnect:
612 if (tag_ops->disconnect)
613 tag_ops->disconnect(ds);
614
615 return err;
616}
617
618static void dsa_switch_teardown_tag_protocol(struct dsa_switch *ds)
619{
620 const struct dsa_device_ops *tag_ops = ds->dst->tag_ops;
621
622 if (tag_ops->disconnect)
623 tag_ops->disconnect(ds);
624}
625
626static int dsa_switch_setup(struct dsa_switch *ds)
627{
628 int err;
629
630 if (ds->setup)
631 return 0;
632
633 /* Initialize ds->phys_mii_mask before registering the user MDIO bus
634 * driver and before ops->setup() has run, since the switch drivers and
635 * the user MDIO bus driver rely on these values for probing PHY
636 * devices or not
637 */
638 ds->phys_mii_mask |= dsa_user_ports(ds);
639
640 err = dsa_switch_devlink_alloc(ds);
641 if (err)
642 return err;
643
644 err = dsa_switch_register_notifier(ds);
645 if (err)
646 goto devlink_free;
647
648 ds->configure_vlan_while_not_filtering = true;
649
650 err = ds->ops->setup(ds);
651 if (err < 0)
652 goto unregister_notifier;
653
654 err = dsa_switch_setup_tag_protocol(ds);
655 if (err)
656 goto teardown;
657
658 if (!ds->user_mii_bus && ds->ops->phy_read) {
659 ds->user_mii_bus = mdiobus_alloc();
660 if (!ds->user_mii_bus) {
661 err = -ENOMEM;
662 goto teardown;
663 }
664
665 dsa_user_mii_bus_init(ds);
666
667 err = mdiobus_register(ds->user_mii_bus);
668 if (err < 0)
669 goto free_user_mii_bus;
670 }
671
672 dsa_switch_devlink_register(ds);
673
674 ds->setup = true;
675 return 0;
676
677free_user_mii_bus:
678 if (ds->user_mii_bus && ds->ops->phy_read)
679 mdiobus_free(ds->user_mii_bus);
680teardown:
681 if (ds->ops->teardown)
682 ds->ops->teardown(ds);
683unregister_notifier:
684 dsa_switch_unregister_notifier(ds);
685devlink_free:
686 dsa_switch_devlink_free(ds);
687 return err;
688}
689
690static void dsa_switch_teardown(struct dsa_switch *ds)
691{
692 if (!ds->setup)
693 return;
694
695 dsa_switch_devlink_unregister(ds);
696
697 if (ds->user_mii_bus && ds->ops->phy_read) {
698 mdiobus_unregister(ds->user_mii_bus);
699 mdiobus_free(ds->user_mii_bus);
700 ds->user_mii_bus = NULL;
701 }
702
703 dsa_switch_teardown_tag_protocol(ds);
704
705 if (ds->ops->teardown)
706 ds->ops->teardown(ds);
707
708 dsa_switch_unregister_notifier(ds);
709
710 dsa_switch_devlink_free(ds);
711
712 ds->setup = false;
713}
714
715/* First tear down the non-shared, then the shared ports. This ensures that
716 * all work items scheduled by our switchdev handlers for user ports have
717 * completed before we destroy the refcounting kept on the shared ports.
718 */
719static void dsa_tree_teardown_ports(struct dsa_switch_tree *dst)
720{
721 struct dsa_port *dp;
722
723 list_for_each_entry(dp, &dst->ports, list)
724 if (dsa_port_is_user(dp) || dsa_port_is_unused(dp))
725 dsa_port_teardown(dp);
726
727 dsa_flush_workqueue();
728
729 list_for_each_entry(dp, &dst->ports, list)
730 if (dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp))
731 dsa_port_teardown(dp);
732}
733
734static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
735{
736 struct dsa_port *dp;
737
738 list_for_each_entry(dp, &dst->ports, list)
739 dsa_switch_teardown(dp->ds);
740}
741
742/* Bring shared ports up first, then non-shared ports */
743static int dsa_tree_setup_ports(struct dsa_switch_tree *dst)
744{
745 struct dsa_port *dp;
746 int err = 0;
747
748 list_for_each_entry(dp, &dst->ports, list) {
749 if (dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp)) {
750 err = dsa_port_setup(dp);
751 if (err)
752 goto teardown;
753 }
754 }
755
756 list_for_each_entry(dp, &dst->ports, list) {
757 if (dsa_port_is_user(dp) || dsa_port_is_unused(dp)) {
758 err = dsa_port_setup(dp);
759 if (err) {
760 err = dsa_port_setup_as_unused(dp);
761 if (err)
762 goto teardown;
763 }
764 }
765 }
766
767 return 0;
768
769teardown:
770 dsa_tree_teardown_ports(dst);
771
772 return err;
773}
774
775static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
776{
777 struct dsa_port *dp;
778 int err = 0;
779
780 list_for_each_entry(dp, &dst->ports, list) {
781 err = dsa_switch_setup(dp->ds);
782 if (err) {
783 dsa_tree_teardown_switches(dst);
784 break;
785 }
786 }
787
788 return err;
789}
790
791static int dsa_tree_setup_conduit(struct dsa_switch_tree *dst)
792{
793 struct dsa_port *cpu_dp;
794 int err = 0;
795
796 rtnl_lock();
797
798 dsa_tree_for_each_cpu_port(cpu_dp, dst) {
799 struct net_device *conduit = cpu_dp->conduit;
800 bool admin_up = (conduit->flags & IFF_UP) &&
801 !qdisc_tx_is_noop(conduit);
802
803 err = dsa_conduit_setup(conduit, cpu_dp);
804 if (err)
805 break;
806
807 /* Replay conduit state event */
808 dsa_tree_conduit_admin_state_change(dst, conduit, admin_up);
809 dsa_tree_conduit_oper_state_change(dst, conduit,
810 netif_oper_up(conduit));
811 }
812
813 rtnl_unlock();
814
815 return err;
816}
817
818static void dsa_tree_teardown_conduit(struct dsa_switch_tree *dst)
819{
820 struct dsa_port *cpu_dp;
821
822 rtnl_lock();
823
824 dsa_tree_for_each_cpu_port(cpu_dp, dst) {
825 struct net_device *conduit = cpu_dp->conduit;
826
827 /* Synthesizing an "admin down" state is sufficient for
828 * the switches to get a notification if the conduit is
829 * currently up and running.
830 */
831 dsa_tree_conduit_admin_state_change(dst, conduit, false);
832
833 dsa_conduit_teardown(conduit);
834 }
835
836 rtnl_unlock();
837}
838
839static int dsa_tree_setup_lags(struct dsa_switch_tree *dst)
840{
841 unsigned int len = 0;
842 struct dsa_port *dp;
843
844 list_for_each_entry(dp, &dst->ports, list) {
845 if (dp->ds->num_lag_ids > len)
846 len = dp->ds->num_lag_ids;
847 }
848
849 if (!len)
850 return 0;
851
852 dst->lags = kcalloc(len, sizeof(*dst->lags), GFP_KERNEL);
853 if (!dst->lags)
854 return -ENOMEM;
855
856 dst->lags_len = len;
857 return 0;
858}
859
860static void dsa_tree_teardown_lags(struct dsa_switch_tree *dst)
861{
862 kfree(dst->lags);
863}
864
865static void dsa_tree_teardown_routing_table(struct dsa_switch_tree *dst)
866{
867 struct dsa_link *dl, *next;
868
869 list_for_each_entry_safe(dl, next, &dst->rtable, list) {
870 list_del(&dl->list);
871 kfree(dl);
872 }
873}
874
875static int dsa_tree_setup(struct dsa_switch_tree *dst)
876{
877 bool complete;
878 int err;
879
880 if (dst->setup) {
881 pr_err("DSA: tree %d already setup! Disjoint trees?\n",
882 dst->index);
883 return -EEXIST;
884 }
885
886 complete = dsa_tree_setup_routing_table(dst);
887 if (!complete)
888 return 0;
889
890 err = dsa_tree_setup_cpu_ports(dst);
891 if (err)
892 goto teardown_rtable;
893
894 err = dsa_tree_setup_switches(dst);
895 if (err)
896 goto teardown_cpu_ports;
897
898 err = dsa_tree_setup_ports(dst);
899 if (err)
900 goto teardown_switches;
901
902 err = dsa_tree_setup_conduit(dst);
903 if (err)
904 goto teardown_ports;
905
906 err = dsa_tree_setup_lags(dst);
907 if (err)
908 goto teardown_conduit;
909
910 dst->setup = true;
911
912 pr_info("DSA: tree %d setup\n", dst->index);
913
914 return 0;
915
916teardown_conduit:
917 dsa_tree_teardown_conduit(dst);
918teardown_ports:
919 dsa_tree_teardown_ports(dst);
920teardown_switches:
921 dsa_tree_teardown_switches(dst);
922teardown_cpu_ports:
923 dsa_tree_teardown_cpu_ports(dst);
924teardown_rtable:
925 dsa_tree_teardown_routing_table(dst);
926
927 return err;
928}
929
930static void dsa_tree_teardown(struct dsa_switch_tree *dst)
931{
932 if (!dst->setup)
933 return;
934
935 dsa_tree_teardown_lags(dst);
936
937 dsa_tree_teardown_conduit(dst);
938
939 dsa_tree_teardown_ports(dst);
940
941 dsa_tree_teardown_switches(dst);
942
943 dsa_tree_teardown_cpu_ports(dst);
944
945 dsa_tree_teardown_routing_table(dst);
946
947 pr_info("DSA: tree %d torn down\n", dst->index);
948
949 dst->setup = false;
950}
951
952static int dsa_tree_bind_tag_proto(struct dsa_switch_tree *dst,
953 const struct dsa_device_ops *tag_ops)
954{
955 const struct dsa_device_ops *old_tag_ops = dst->tag_ops;
956 struct dsa_notifier_tag_proto_info info;
957 int err;
958
959 dst->tag_ops = tag_ops;
960
961 /* Notify the switches from this tree about the connection
962 * to the new tagger
963 */
964 info.tag_ops = tag_ops;
965 err = dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_CONNECT, &info);
966 if (err && err != -EOPNOTSUPP)
967 goto out_disconnect;
968
969 /* Notify the old tagger about the disconnection from this tree */
970 info.tag_ops = old_tag_ops;
971 dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_DISCONNECT, &info);
972
973 return 0;
974
975out_disconnect:
976 info.tag_ops = tag_ops;
977 dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_DISCONNECT, &info);
978 dst->tag_ops = old_tag_ops;
979
980 return err;
981}
982
983/* Since the dsa/tagging sysfs device attribute is per conduit, the assumption
984 * is that all DSA switches within a tree share the same tagger, otherwise
985 * they would have formed disjoint trees (different "dsa,member" values).
986 */
987int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst,
988 const struct dsa_device_ops *tag_ops,
989 const struct dsa_device_ops *old_tag_ops)
990{
991 struct dsa_notifier_tag_proto_info info;
992 struct dsa_port *dp;
993 int err = -EBUSY;
994
995 if (!rtnl_trylock())
996 return restart_syscall();
997
998 /* At the moment we don't allow changing the tag protocol under
999 * traffic. The rtnl_mutex also happens to serialize concurrent
1000 * attempts to change the tagging protocol. If we ever lift the IFF_UP
1001 * restriction, there needs to be another mutex which serializes this.
1002 */
1003 dsa_tree_for_each_user_port(dp, dst) {
1004 if (dsa_port_to_conduit(dp)->flags & IFF_UP)
1005 goto out_unlock;
1006
1007 if (dp->user->flags & IFF_UP)
1008 goto out_unlock;
1009 }
1010
1011 /* Notify the tag protocol change */
1012 info.tag_ops = tag_ops;
1013 err = dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO, &info);
1014 if (err)
1015 goto out_unwind_tagger;
1016
1017 err = dsa_tree_bind_tag_proto(dst, tag_ops);
1018 if (err)
1019 goto out_unwind_tagger;
1020
1021 rtnl_unlock();
1022
1023 return 0;
1024
1025out_unwind_tagger:
1026 info.tag_ops = old_tag_ops;
1027 dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO, &info);
1028out_unlock:
1029 rtnl_unlock();
1030 return err;
1031}
1032
1033static void dsa_tree_conduit_state_change(struct dsa_switch_tree *dst,
1034 struct net_device *conduit)
1035{
1036 struct dsa_notifier_conduit_state_info info;
1037 struct dsa_port *cpu_dp = conduit->dsa_ptr;
1038
1039 info.conduit = conduit;
1040 info.operational = dsa_port_conduit_is_operational(cpu_dp);
1041
1042 dsa_tree_notify(dst, DSA_NOTIFIER_CONDUIT_STATE_CHANGE, &info);
1043}
1044
1045void dsa_tree_conduit_admin_state_change(struct dsa_switch_tree *dst,
1046 struct net_device *conduit,
1047 bool up)
1048{
1049 struct dsa_port *cpu_dp = conduit->dsa_ptr;
1050 bool notify = false;
1051
1052 /* Don't keep track of admin state on LAG DSA conduits,
1053 * but rather just of physical DSA conduits
1054 */
1055 if (netif_is_lag_master(conduit))
1056 return;
1057
1058 if ((dsa_port_conduit_is_operational(cpu_dp)) !=
1059 (up && cpu_dp->conduit_oper_up))
1060 notify = true;
1061
1062 cpu_dp->conduit_admin_up = up;
1063
1064 if (notify)
1065 dsa_tree_conduit_state_change(dst, conduit);
1066}
1067
1068void dsa_tree_conduit_oper_state_change(struct dsa_switch_tree *dst,
1069 struct net_device *conduit,
1070 bool up)
1071{
1072 struct dsa_port *cpu_dp = conduit->dsa_ptr;
1073 bool notify = false;
1074
1075 /* Don't keep track of oper state on LAG DSA conduits,
1076 * but rather just of physical DSA conduits
1077 */
1078 if (netif_is_lag_master(conduit))
1079 return;
1080
1081 if ((dsa_port_conduit_is_operational(cpu_dp)) !=
1082 (cpu_dp->conduit_admin_up && up))
1083 notify = true;
1084
1085 cpu_dp->conduit_oper_up = up;
1086
1087 if (notify)
1088 dsa_tree_conduit_state_change(dst, conduit);
1089}
1090
1091static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index)
1092{
1093 struct dsa_switch_tree *dst = ds->dst;
1094 struct dsa_port *dp;
1095
1096 dsa_switch_for_each_port(dp, ds)
1097 if (dp->index == index)
1098 return dp;
1099
1100 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1101 if (!dp)
1102 return NULL;
1103
1104 dp->ds = ds;
1105 dp->index = index;
1106
1107 mutex_init(&dp->addr_lists_lock);
1108 mutex_init(&dp->vlans_lock);
1109 INIT_LIST_HEAD(&dp->fdbs);
1110 INIT_LIST_HEAD(&dp->mdbs);
1111 INIT_LIST_HEAD(&dp->vlans); /* also initializes &dp->user_vlans */
1112 INIT_LIST_HEAD(&dp->list);
1113 list_add_tail(&dp->list, &dst->ports);
1114
1115 return dp;
1116}
1117
1118static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
1119{
1120 dp->type = DSA_PORT_TYPE_USER;
1121 dp->name = name;
1122
1123 return 0;
1124}
1125
1126static int dsa_port_parse_dsa(struct dsa_port *dp)
1127{
1128 dp->type = DSA_PORT_TYPE_DSA;
1129
1130 return 0;
1131}
1132
1133static enum dsa_tag_protocol dsa_get_tag_protocol(struct dsa_port *dp,
1134 struct net_device *conduit)
1135{
1136 enum dsa_tag_protocol tag_protocol = DSA_TAG_PROTO_NONE;
1137 struct dsa_switch *mds, *ds = dp->ds;
1138 unsigned int mdp_upstream;
1139 struct dsa_port *mdp;
1140
1141 /* It is possible to stack DSA switches onto one another when that
1142 * happens the switch driver may want to know if its tagging protocol
1143 * is going to work in such a configuration.
1144 */
1145 if (dsa_user_dev_check(conduit)) {
1146 mdp = dsa_user_to_port(conduit);
1147 mds = mdp->ds;
1148 mdp_upstream = dsa_upstream_port(mds, mdp->index);
1149 tag_protocol = mds->ops->get_tag_protocol(mds, mdp_upstream,
1150 DSA_TAG_PROTO_NONE);
1151 }
1152
1153 /* If the conduit device is not itself a DSA user in a disjoint DSA
1154 * tree, then return immediately.
1155 */
1156 return ds->ops->get_tag_protocol(ds, dp->index, tag_protocol);
1157}
1158
1159static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *conduit,
1160 const char *user_protocol)
1161{
1162 const struct dsa_device_ops *tag_ops = NULL;
1163 struct dsa_switch *ds = dp->ds;
1164 struct dsa_switch_tree *dst = ds->dst;
1165 enum dsa_tag_protocol default_proto;
1166
1167 /* Find out which protocol the switch would prefer. */
1168 default_proto = dsa_get_tag_protocol(dp, conduit);
1169 if (dst->default_proto) {
1170 if (dst->default_proto != default_proto) {
1171 dev_err(ds->dev,
1172 "A DSA switch tree can have only one tagging protocol\n");
1173 return -EINVAL;
1174 }
1175 } else {
1176 dst->default_proto = default_proto;
1177 }
1178
1179 /* See if the user wants to override that preference. */
1180 if (user_protocol) {
1181 if (!ds->ops->change_tag_protocol) {
1182 dev_err(ds->dev, "Tag protocol cannot be modified\n");
1183 return -EINVAL;
1184 }
1185
1186 tag_ops = dsa_tag_driver_get_by_name(user_protocol);
1187 if (IS_ERR(tag_ops)) {
1188 dev_warn(ds->dev,
1189 "Failed to find a tagging driver for protocol %s, using default\n",
1190 user_protocol);
1191 tag_ops = NULL;
1192 }
1193 }
1194
1195 if (!tag_ops)
1196 tag_ops = dsa_tag_driver_get_by_id(default_proto);
1197
1198 if (IS_ERR(tag_ops)) {
1199 if (PTR_ERR(tag_ops) == -ENOPROTOOPT)
1200 return -EPROBE_DEFER;
1201
1202 dev_warn(ds->dev, "No tagger for this switch\n");
1203 return PTR_ERR(tag_ops);
1204 }
1205
1206 if (dst->tag_ops) {
1207 if (dst->tag_ops != tag_ops) {
1208 dev_err(ds->dev,
1209 "A DSA switch tree can have only one tagging protocol\n");
1210
1211 dsa_tag_driver_put(tag_ops);
1212 return -EINVAL;
1213 }
1214
1215 /* In the case of multiple CPU ports per switch, the tagging
1216 * protocol is still reference-counted only per switch tree.
1217 */
1218 dsa_tag_driver_put(tag_ops);
1219 } else {
1220 dst->tag_ops = tag_ops;
1221 }
1222
1223 dp->conduit = conduit;
1224 dp->type = DSA_PORT_TYPE_CPU;
1225 dsa_port_set_tag_protocol(dp, dst->tag_ops);
1226 dp->dst = dst;
1227
1228 /* At this point, the tree may be configured to use a different
1229 * tagger than the one chosen by the switch driver during
1230 * .setup, in the case when a user selects a custom protocol
1231 * through the DT.
1232 *
1233 * This is resolved by syncing the driver with the tree in
1234 * dsa_switch_setup_tag_protocol once .setup has run and the
1235 * driver is ready to accept calls to .change_tag_protocol. If
1236 * the driver does not support the custom protocol at that
1237 * point, the tree is wholly rejected, thereby ensuring that the
1238 * tree and driver are always in agreement on the protocol to
1239 * use.
1240 */
1241 return 0;
1242}
1243
1244static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
1245{
1246 struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
1247 const char *name = of_get_property(dn, "label", NULL);
1248 bool link = of_property_read_bool(dn, "link");
1249
1250 dp->dn = dn;
1251
1252 if (ethernet) {
1253 struct net_device *conduit;
1254 const char *user_protocol;
1255
1256 conduit = of_find_net_device_by_node(ethernet);
1257 of_node_put(ethernet);
1258 if (!conduit)
1259 return -EPROBE_DEFER;
1260
1261 user_protocol = of_get_property(dn, "dsa-tag-protocol", NULL);
1262 return dsa_port_parse_cpu(dp, conduit, user_protocol);
1263 }
1264
1265 if (link)
1266 return dsa_port_parse_dsa(dp);
1267
1268 return dsa_port_parse_user(dp, name);
1269}
1270
1271static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
1272 struct device_node *dn)
1273{
1274 struct device_node *ports, *port;
1275 struct dsa_port *dp;
1276 int err = 0;
1277 u32 reg;
1278
1279 ports = of_get_child_by_name(dn, "ports");
1280 if (!ports) {
1281 /* The second possibility is "ethernet-ports" */
1282 ports = of_get_child_by_name(dn, "ethernet-ports");
1283 if (!ports) {
1284 dev_err(ds->dev, "no ports child node found\n");
1285 return -EINVAL;
1286 }
1287 }
1288
1289 for_each_available_child_of_node(ports, port) {
1290 err = of_property_read_u32(port, "reg", &reg);
1291 if (err) {
1292 of_node_put(port);
1293 goto out_put_node;
1294 }
1295
1296 if (reg >= ds->num_ports) {
1297 dev_err(ds->dev, "port %pOF index %u exceeds num_ports (%u)\n",
1298 port, reg, ds->num_ports);
1299 of_node_put(port);
1300 err = -EINVAL;
1301 goto out_put_node;
1302 }
1303
1304 dp = dsa_to_port(ds, reg);
1305
1306 err = dsa_port_parse_of(dp, port);
1307 if (err) {
1308 of_node_put(port);
1309 goto out_put_node;
1310 }
1311 }
1312
1313out_put_node:
1314 of_node_put(ports);
1315 return err;
1316}
1317
1318static int dsa_switch_parse_member_of(struct dsa_switch *ds,
1319 struct device_node *dn)
1320{
1321 u32 m[2] = { 0, 0 };
1322 int sz;
1323
1324 /* Don't error out if this optional property isn't found */
1325 sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
1326 if (sz < 0 && sz != -EINVAL)
1327 return sz;
1328
1329 ds->index = m[1];
1330
1331 ds->dst = dsa_tree_touch(m[0]);
1332 if (!ds->dst)
1333 return -ENOMEM;
1334
1335 if (dsa_switch_find(ds->dst->index, ds->index)) {
1336 dev_err(ds->dev,
1337 "A DSA switch with index %d already exists in tree %d\n",
1338 ds->index, ds->dst->index);
1339 return -EEXIST;
1340 }
1341
1342 if (ds->dst->last_switch < ds->index)
1343 ds->dst->last_switch = ds->index;
1344
1345 return 0;
1346}
1347
1348static int dsa_switch_touch_ports(struct dsa_switch *ds)
1349{
1350 struct dsa_port *dp;
1351 int port;
1352
1353 for (port = 0; port < ds->num_ports; port++) {
1354 dp = dsa_port_touch(ds, port);
1355 if (!dp)
1356 return -ENOMEM;
1357 }
1358
1359 return 0;
1360}
1361
1362static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
1363{
1364 int err;
1365
1366 err = dsa_switch_parse_member_of(ds, dn);
1367 if (err)
1368 return err;
1369
1370 err = dsa_switch_touch_ports(ds);
1371 if (err)
1372 return err;
1373
1374 return dsa_switch_parse_ports_of(ds, dn);
1375}
1376
1377static int dev_is_class(struct device *dev, const void *class)
1378{
1379 if (dev->class != NULL && !strcmp(dev->class->name, class))
1380 return 1;
1381
1382 return 0;
1383}
1384
1385static struct device *dev_find_class(struct device *parent, char *class)
1386{
1387 if (dev_is_class(parent, class)) {
1388 get_device(parent);
1389 return parent;
1390 }
1391
1392 return device_find_child(parent, class, dev_is_class);
1393}
1394
1395static struct net_device *dsa_dev_to_net_device(struct device *dev)
1396{
1397 struct device *d;
1398
1399 d = dev_find_class(dev, "net");
1400 if (d != NULL) {
1401 struct net_device *nd;
1402
1403 nd = to_net_dev(d);
1404 dev_hold(nd);
1405 put_device(d);
1406
1407 return nd;
1408 }
1409
1410 return NULL;
1411}
1412
1413static int dsa_port_parse(struct dsa_port *dp, const char *name,
1414 struct device *dev)
1415{
1416 if (!strcmp(name, "cpu")) {
1417 struct net_device *conduit;
1418
1419 conduit = dsa_dev_to_net_device(dev);
1420 if (!conduit)
1421 return -EPROBE_DEFER;
1422
1423 dev_put(conduit);
1424
1425 return dsa_port_parse_cpu(dp, conduit, NULL);
1426 }
1427
1428 if (!strcmp(name, "dsa"))
1429 return dsa_port_parse_dsa(dp);
1430
1431 return dsa_port_parse_user(dp, name);
1432}
1433
1434static int dsa_switch_parse_ports(struct dsa_switch *ds,
1435 struct dsa_chip_data *cd)
1436{
1437 bool valid_name_found = false;
1438 struct dsa_port *dp;
1439 struct device *dev;
1440 const char *name;
1441 unsigned int i;
1442 int err;
1443
1444 for (i = 0; i < DSA_MAX_PORTS; i++) {
1445 name = cd->port_names[i];
1446 dev = cd->netdev[i];
1447 dp = dsa_to_port(ds, i);
1448
1449 if (!name)
1450 continue;
1451
1452 err = dsa_port_parse(dp, name, dev);
1453 if (err)
1454 return err;
1455
1456 valid_name_found = true;
1457 }
1458
1459 if (!valid_name_found && i == DSA_MAX_PORTS)
1460 return -EINVAL;
1461
1462 return 0;
1463}
1464
1465static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
1466{
1467 int err;
1468
1469 ds->cd = cd;
1470
1471 /* We don't support interconnected switches nor multiple trees via
1472 * platform data, so this is the unique switch of the tree.
1473 */
1474 ds->index = 0;
1475 ds->dst = dsa_tree_touch(0);
1476 if (!ds->dst)
1477 return -ENOMEM;
1478
1479 err = dsa_switch_touch_ports(ds);
1480 if (err)
1481 return err;
1482
1483 return dsa_switch_parse_ports(ds, cd);
1484}
1485
1486static void dsa_switch_release_ports(struct dsa_switch *ds)
1487{
1488 struct dsa_mac_addr *a, *tmp;
1489 struct dsa_port *dp, *next;
1490 struct dsa_vlan *v, *n;
1491
1492 dsa_switch_for_each_port_safe(dp, next, ds) {
1493 /* These are either entries that upper layers lost track of
1494 * (probably due to bugs), or installed through interfaces
1495 * where one does not necessarily have to remove them, like
1496 * ndo_dflt_fdb_add().
1497 */
1498 list_for_each_entry_safe(a, tmp, &dp->fdbs, list) {
1499 dev_info(ds->dev,
1500 "Cleaning up unicast address %pM vid %u from port %d\n",
1501 a->addr, a->vid, dp->index);
1502 list_del(&a->list);
1503 kfree(a);
1504 }
1505
1506 list_for_each_entry_safe(a, tmp, &dp->mdbs, list) {
1507 dev_info(ds->dev,
1508 "Cleaning up multicast address %pM vid %u from port %d\n",
1509 a->addr, a->vid, dp->index);
1510 list_del(&a->list);
1511 kfree(a);
1512 }
1513
1514 /* These are entries that upper layers have lost track of,
1515 * probably due to bugs, but also due to dsa_port_do_vlan_del()
1516 * having failed and the VLAN entry still lingering on.
1517 */
1518 list_for_each_entry_safe(v, n, &dp->vlans, list) {
1519 dev_info(ds->dev,
1520 "Cleaning up vid %u from port %d\n",
1521 v->vid, dp->index);
1522 list_del(&v->list);
1523 kfree(v);
1524 }
1525
1526 list_del(&dp->list);
1527 kfree(dp);
1528 }
1529}
1530
1531static int dsa_switch_probe(struct dsa_switch *ds)
1532{
1533 struct dsa_switch_tree *dst;
1534 struct dsa_chip_data *pdata;
1535 struct device_node *np;
1536 int err;
1537
1538 if (!ds->dev)
1539 return -ENODEV;
1540
1541 pdata = ds->dev->platform_data;
1542 np = ds->dev->of_node;
1543
1544 if (!ds->num_ports)
1545 return -EINVAL;
1546
1547 if (np) {
1548 err = dsa_switch_parse_of(ds, np);
1549 if (err)
1550 dsa_switch_release_ports(ds);
1551 } else if (pdata) {
1552 err = dsa_switch_parse(ds, pdata);
1553 if (err)
1554 dsa_switch_release_ports(ds);
1555 } else {
1556 err = -ENODEV;
1557 }
1558
1559 if (err)
1560 return err;
1561
1562 dst = ds->dst;
1563 dsa_tree_get(dst);
1564 err = dsa_tree_setup(dst);
1565 if (err) {
1566 dsa_switch_release_ports(ds);
1567 dsa_tree_put(dst);
1568 }
1569
1570 return err;
1571}
1572
1573int dsa_register_switch(struct dsa_switch *ds)
1574{
1575 int err;
1576
1577 mutex_lock(&dsa2_mutex);
1578 err = dsa_switch_probe(ds);
1579 dsa_tree_put(ds->dst);
1580 mutex_unlock(&dsa2_mutex);
1581
1582 return err;
1583}
1584EXPORT_SYMBOL_GPL(dsa_register_switch);
1585
1586static void dsa_switch_remove(struct dsa_switch *ds)
1587{
1588 struct dsa_switch_tree *dst = ds->dst;
1589
1590 dsa_tree_teardown(dst);
1591 dsa_switch_release_ports(ds);
1592 dsa_tree_put(dst);
1593}
1594
1595void dsa_unregister_switch(struct dsa_switch *ds)
1596{
1597 mutex_lock(&dsa2_mutex);
1598 dsa_switch_remove(ds);
1599 mutex_unlock(&dsa2_mutex);
1600}
1601EXPORT_SYMBOL_GPL(dsa_unregister_switch);
1602
1603/* If the DSA conduit chooses to unregister its net_device on .shutdown, DSA is
1604 * blocking that operation from completion, due to the dev_hold taken inside
1605 * netdev_upper_dev_link. Unlink the DSA user interfaces from being uppers of
1606 * the DSA conduit, so that the system can reboot successfully.
1607 */
1608void dsa_switch_shutdown(struct dsa_switch *ds)
1609{
1610 struct net_device *conduit, *user_dev;
1611 LIST_HEAD(close_list);
1612 struct dsa_port *dp;
1613
1614 mutex_lock(&dsa2_mutex);
1615
1616 if (!ds->setup)
1617 goto out;
1618
1619 rtnl_lock();
1620
1621 dsa_switch_for_each_cpu_port(dp, ds)
1622 list_add(&dp->conduit->close_list, &close_list);
1623
1624 dev_close_many(&close_list, true);
1625
1626 dsa_switch_for_each_user_port(dp, ds) {
1627 conduit = dsa_port_to_conduit(dp);
1628 user_dev = dp->user;
1629
1630 netif_device_detach(user_dev);
1631 netdev_upper_dev_unlink(conduit, user_dev);
1632 }
1633
1634 /* Disconnect from further netdevice notifiers on the conduit,
1635 * since netdev_uses_dsa() will now return false.
1636 */
1637 dsa_switch_for_each_cpu_port(dp, ds)
1638 dp->conduit->dsa_ptr = NULL;
1639
1640 rtnl_unlock();
1641out:
1642 mutex_unlock(&dsa2_mutex);
1643}
1644EXPORT_SYMBOL_GPL(dsa_switch_shutdown);
1645
1646#ifdef CONFIG_PM_SLEEP
1647static bool dsa_port_is_initialized(const struct dsa_port *dp)
1648{
1649 return dp->type == DSA_PORT_TYPE_USER && dp->user;
1650}
1651
1652int dsa_switch_suspend(struct dsa_switch *ds)
1653{
1654 struct dsa_port *dp;
1655 int ret = 0;
1656
1657 /* Suspend user network devices */
1658 dsa_switch_for_each_port(dp, ds) {
1659 if (!dsa_port_is_initialized(dp))
1660 continue;
1661
1662 ret = dsa_user_suspend(dp->user);
1663 if (ret)
1664 return ret;
1665 }
1666
1667 if (ds->ops->suspend)
1668 ret = ds->ops->suspend(ds);
1669
1670 return ret;
1671}
1672EXPORT_SYMBOL_GPL(dsa_switch_suspend);
1673
1674int dsa_switch_resume(struct dsa_switch *ds)
1675{
1676 struct dsa_port *dp;
1677 int ret = 0;
1678
1679 if (ds->ops->resume)
1680 ret = ds->ops->resume(ds);
1681
1682 if (ret)
1683 return ret;
1684
1685 /* Resume user network devices */
1686 dsa_switch_for_each_port(dp, ds) {
1687 if (!dsa_port_is_initialized(dp))
1688 continue;
1689
1690 ret = dsa_user_resume(dp->user);
1691 if (ret)
1692 return ret;
1693 }
1694
1695 return 0;
1696}
1697EXPORT_SYMBOL_GPL(dsa_switch_resume);
1698#endif
1699
1700struct dsa_port *dsa_port_from_netdev(struct net_device *netdev)
1701{
1702 if (!netdev || !dsa_user_dev_check(netdev))
1703 return ERR_PTR(-ENODEV);
1704
1705 return dsa_user_to_port(netdev);
1706}
1707EXPORT_SYMBOL_GPL(dsa_port_from_netdev);
1708
1709bool dsa_db_equal(const struct dsa_db *a, const struct dsa_db *b)
1710{
1711 if (a->type != b->type)
1712 return false;
1713
1714 switch (a->type) {
1715 case DSA_DB_PORT:
1716 return a->dp == b->dp;
1717 case DSA_DB_LAG:
1718 return a->lag.dev == b->lag.dev;
1719 case DSA_DB_BRIDGE:
1720 return a->bridge.num == b->bridge.num;
1721 default:
1722 WARN_ON(1);
1723 return false;
1724 }
1725}
1726
1727bool dsa_fdb_present_in_other_db(struct dsa_switch *ds, int port,
1728 const unsigned char *addr, u16 vid,
1729 struct dsa_db db)
1730{
1731 struct dsa_port *dp = dsa_to_port(ds, port);
1732 struct dsa_mac_addr *a;
1733
1734 lockdep_assert_held(&dp->addr_lists_lock);
1735
1736 list_for_each_entry(a, &dp->fdbs, list) {
1737 if (!ether_addr_equal(a->addr, addr) || a->vid != vid)
1738 continue;
1739
1740 if (a->db.type == db.type && !dsa_db_equal(&a->db, &db))
1741 return true;
1742 }
1743
1744 return false;
1745}
1746EXPORT_SYMBOL_GPL(dsa_fdb_present_in_other_db);
1747
1748bool dsa_mdb_present_in_other_db(struct dsa_switch *ds, int port,
1749 const struct switchdev_obj_port_mdb *mdb,
1750 struct dsa_db db)
1751{
1752 struct dsa_port *dp = dsa_to_port(ds, port);
1753 struct dsa_mac_addr *a;
1754
1755 lockdep_assert_held(&dp->addr_lists_lock);
1756
1757 list_for_each_entry(a, &dp->mdbs, list) {
1758 if (!ether_addr_equal(a->addr, mdb->addr) || a->vid != mdb->vid)
1759 continue;
1760
1761 if (a->db.type == db.type && !dsa_db_equal(&a->db, &db))
1762 return true;
1763 }
1764
1765 return false;
1766}
1767EXPORT_SYMBOL_GPL(dsa_mdb_present_in_other_db);
1768
1769static const struct dsa_stubs __dsa_stubs = {
1770 .conduit_hwtstamp_validate = __dsa_conduit_hwtstamp_validate,
1771};
1772
1773static void dsa_register_stubs(void)
1774{
1775 dsa_stubs = &__dsa_stubs;
1776}
1777
1778static void dsa_unregister_stubs(void)
1779{
1780 dsa_stubs = NULL;
1781}
1782
1783static int __init dsa_init_module(void)
1784{
1785 int rc;
1786
1787 dsa_owq = alloc_ordered_workqueue("dsa_ordered",
1788 WQ_MEM_RECLAIM);
1789 if (!dsa_owq)
1790 return -ENOMEM;
1791
1792 rc = dsa_user_register_notifier();
1793 if (rc)
1794 goto register_notifier_fail;
1795
1796 dev_add_pack(&dsa_pack_type);
1797
1798 rc = rtnl_link_register(&dsa_link_ops);
1799 if (rc)
1800 goto netlink_register_fail;
1801
1802 dsa_register_stubs();
1803
1804 return 0;
1805
1806netlink_register_fail:
1807 dsa_user_unregister_notifier();
1808 dev_remove_pack(&dsa_pack_type);
1809register_notifier_fail:
1810 destroy_workqueue(dsa_owq);
1811
1812 return rc;
1813}
1814module_init(dsa_init_module);
1815
1816static void __exit dsa_cleanup_module(void)
1817{
1818 dsa_unregister_stubs();
1819
1820 rtnl_link_unregister(&dsa_link_ops);
1821
1822 dsa_user_unregister_notifier();
1823 dev_remove_pack(&dsa_pack_type);
1824 destroy_workqueue(dsa_owq);
1825}
1826module_exit(dsa_cleanup_module);
1827
1828MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1829MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1830MODULE_LICENSE("GPL");
1831MODULE_ALIAS("platform:dsa");
Linux 6.x block layer and io_uring tree(s)