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_mdio.h> |
19 | #include <linux/of_net.h> |
20 | #include <net/dsa_stubs.h> |
21 | #include <net/sch_generic.h> |
22 | |
23 | #include "conduit.h" |
24 | #include "devlink.h" |
25 | #include "dsa.h" |
26 | #include "netlink.h" |
27 | #include "port.h" |
28 | #include "switch.h" |
29 | #include "tag.h" |
30 | #include "user.h" |
31 | |
32 | #define DSA_MAX_NUM_OFFLOADING_BRIDGES BITS_PER_LONG |
33 | |
34 | static DEFINE_MUTEX(dsa2_mutex); |
35 | LIST_HEAD(dsa_tree_list); |
36 | |
37 | static struct workqueue_struct *dsa_owq; |
38 | |
39 | /* Track the bridges with forwarding offload enabled */ |
40 | static unsigned long dsa_fwd_offloading_bridges; |
41 | |
42 | bool dsa_schedule_work(struct work_struct *work) |
43 | { |
44 | return queue_work(wq: dsa_owq, work); |
45 | } |
46 | |
47 | void dsa_flush_workqueue(void) |
48 | { |
49 | flush_workqueue(dsa_owq); |
50 | } |
51 | EXPORT_SYMBOL_GPL(dsa_flush_workqueue); |
52 | |
53 | /** |
54 | * dsa_lag_map() - Map LAG structure to a linear LAG array |
55 | * @dst: Tree in which to record the mapping. |
56 | * @lag: LAG structure that is to be mapped to the tree's array. |
57 | * |
58 | * dsa_lag_id/dsa_lag_by_id can then be used to translate between the |
59 | * two spaces. The size of the mapping space is determined by the |
60 | * driver by setting ds->num_lag_ids. It is perfectly legal to leave |
61 | * it unset if it is not needed, in which case these functions become |
62 | * no-ops. |
63 | */ |
64 | void dsa_lag_map(struct dsa_switch_tree *dst, struct dsa_lag *lag) |
65 | { |
66 | unsigned int id; |
67 | |
68 | for (id = 1; id <= dst->lags_len; id++) { |
69 | if (!dsa_lag_by_id(dst, id)) { |
70 | dst->lags[id - 1] = lag; |
71 | lag->id = id; |
72 | return; |
73 | } |
74 | } |
75 | |
76 | /* No IDs left, which is OK. Some drivers do not need it. The |
77 | * ones that do, e.g. mv88e6xxx, will discover that dsa_lag_id |
78 | * returns an error for this device when joining the LAG. The |
79 | * driver can then return -EOPNOTSUPP back to DSA, which will |
80 | * fall back to a software LAG. |
81 | */ |
82 | } |
83 | |
84 | /** |
85 | * dsa_lag_unmap() - Remove a LAG ID mapping |
86 | * @dst: Tree in which the mapping is recorded. |
87 | * @lag: LAG structure that was mapped. |
88 | * |
89 | * As there may be multiple users of the mapping, it is only removed |
90 | * if there are no other references to it. |
91 | */ |
92 | void dsa_lag_unmap(struct dsa_switch_tree *dst, struct dsa_lag *lag) |
93 | { |
94 | unsigned int id; |
95 | |
96 | dsa_lags_foreach_id(id, dst) { |
97 | if (dsa_lag_by_id(dst, id) == lag) { |
98 | dst->lags[id - 1] = NULL; |
99 | lag->id = 0; |
100 | break; |
101 | } |
102 | } |
103 | } |
104 | |
105 | struct dsa_lag *dsa_tree_lag_find(struct dsa_switch_tree *dst, |
106 | const struct net_device *lag_dev) |
107 | { |
108 | struct dsa_port *dp; |
109 | |
110 | list_for_each_entry(dp, &dst->ports, list) |
111 | if (dsa_port_lag_dev_get(dp) == lag_dev) |
112 | return dp->lag; |
113 | |
114 | return NULL; |
115 | } |
116 | |
117 | struct dsa_bridge *dsa_tree_bridge_find(struct dsa_switch_tree *dst, |
118 | const struct net_device *br) |
119 | { |
120 | struct dsa_port *dp; |
121 | |
122 | list_for_each_entry(dp, &dst->ports, list) |
123 | if (dsa_port_bridge_dev_get(dp) == br) |
124 | return dp->bridge; |
125 | |
126 | return NULL; |
127 | } |
128 | |
129 | static int dsa_bridge_num_find(const struct net_device *bridge_dev) |
130 | { |
131 | struct dsa_switch_tree *dst; |
132 | |
133 | list_for_each_entry(dst, &dsa_tree_list, list) { |
134 | struct dsa_bridge *bridge; |
135 | |
136 | bridge = dsa_tree_bridge_find(dst, br: bridge_dev); |
137 | if (bridge) |
138 | return bridge->num; |
139 | } |
140 | |
141 | return 0; |
142 | } |
143 | |
144 | unsigned int dsa_bridge_num_get(const struct net_device *bridge_dev, int max) |
145 | { |
146 | unsigned int bridge_num = dsa_bridge_num_find(bridge_dev); |
147 | |
148 | /* Switches without FDB isolation support don't get unique |
149 | * bridge numbering |
150 | */ |
151 | if (!max) |
152 | return 0; |
153 | |
154 | if (!bridge_num) { |
155 | /* First port that requests FDB isolation or TX forwarding |
156 | * offload for this bridge |
157 | */ |
158 | bridge_num = find_next_zero_bit(addr: &dsa_fwd_offloading_bridges, |
159 | DSA_MAX_NUM_OFFLOADING_BRIDGES, |
160 | offset: 1); |
161 | if (bridge_num >= max) |
162 | return 0; |
163 | |
164 | set_bit(nr: bridge_num, addr: &dsa_fwd_offloading_bridges); |
165 | } |
166 | |
167 | return bridge_num; |
168 | } |
169 | |
170 | void dsa_bridge_num_put(const struct net_device *bridge_dev, |
171 | unsigned int bridge_num) |
172 | { |
173 | /* Since we refcount bridges, we know that when we call this function |
174 | * it is no longer in use, so we can just go ahead and remove it from |
175 | * the bit mask. |
176 | */ |
177 | clear_bit(nr: bridge_num, addr: &dsa_fwd_offloading_bridges); |
178 | } |
179 | |
180 | struct dsa_switch *dsa_switch_find(int tree_index, int sw_index) |
181 | { |
182 | struct dsa_switch_tree *dst; |
183 | struct dsa_port *dp; |
184 | |
185 | list_for_each_entry(dst, &dsa_tree_list, list) { |
186 | if (dst->index != tree_index) |
187 | continue; |
188 | |
189 | list_for_each_entry(dp, &dst->ports, list) { |
190 | if (dp->ds->index != sw_index) |
191 | continue; |
192 | |
193 | return dp->ds; |
194 | } |
195 | } |
196 | |
197 | return NULL; |
198 | } |
199 | EXPORT_SYMBOL_GPL(dsa_switch_find); |
200 | |
201 | static struct dsa_switch_tree *dsa_tree_find(int index) |
202 | { |
203 | struct dsa_switch_tree *dst; |
204 | |
205 | list_for_each_entry(dst, &dsa_tree_list, list) |
206 | if (dst->index == index) |
207 | return dst; |
208 | |
209 | return NULL; |
210 | } |
211 | |
212 | static struct dsa_switch_tree *dsa_tree_alloc(int index) |
213 | { |
214 | struct dsa_switch_tree *dst; |
215 | |
216 | dst = kzalloc(size: sizeof(*dst), GFP_KERNEL); |
217 | if (!dst) |
218 | return NULL; |
219 | |
220 | dst->index = index; |
221 | |
222 | INIT_LIST_HEAD(list: &dst->rtable); |
223 | |
224 | INIT_LIST_HEAD(list: &dst->ports); |
225 | |
226 | INIT_LIST_HEAD(list: &dst->list); |
227 | list_add_tail(new: &dst->list, head: &dsa_tree_list); |
228 | |
229 | kref_init(kref: &dst->refcount); |
230 | |
231 | return dst; |
232 | } |
233 | |
234 | static void dsa_tree_free(struct dsa_switch_tree *dst) |
235 | { |
236 | if (dst->tag_ops) |
237 | dsa_tag_driver_put(ops: dst->tag_ops); |
238 | list_del(entry: &dst->list); |
239 | kfree(objp: dst); |
240 | } |
241 | |
242 | static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst) |
243 | { |
244 | if (dst) |
245 | kref_get(kref: &dst->refcount); |
246 | |
247 | return dst; |
248 | } |
249 | |
250 | static struct dsa_switch_tree *dsa_tree_touch(int index) |
251 | { |
252 | struct dsa_switch_tree *dst; |
253 | |
254 | dst = dsa_tree_find(index); |
255 | if (dst) |
256 | return dsa_tree_get(dst); |
257 | else |
258 | return dsa_tree_alloc(index); |
259 | } |
260 | |
261 | static void dsa_tree_release(struct kref *ref) |
262 | { |
263 | struct dsa_switch_tree *dst; |
264 | |
265 | dst = container_of(ref, struct dsa_switch_tree, refcount); |
266 | |
267 | dsa_tree_free(dst); |
268 | } |
269 | |
270 | static void dsa_tree_put(struct dsa_switch_tree *dst) |
271 | { |
272 | if (dst) |
273 | kref_put(kref: &dst->refcount, release: dsa_tree_release); |
274 | } |
275 | |
276 | static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst, |
277 | struct device_node *dn) |
278 | { |
279 | struct dsa_port *dp; |
280 | |
281 | list_for_each_entry(dp, &dst->ports, list) |
282 | if (dp->dn == dn) |
283 | return dp; |
284 | |
285 | return NULL; |
286 | } |
287 | |
288 | static struct dsa_link *dsa_link_touch(struct dsa_port *dp, |
289 | struct dsa_port *link_dp) |
290 | { |
291 | struct dsa_switch *ds = dp->ds; |
292 | struct dsa_switch_tree *dst; |
293 | struct dsa_link *dl; |
294 | |
295 | dst = ds->dst; |
296 | |
297 | list_for_each_entry(dl, &dst->rtable, list) |
298 | if (dl->dp == dp && dl->link_dp == link_dp) |
299 | return dl; |
300 | |
301 | dl = kzalloc(size: sizeof(*dl), GFP_KERNEL); |
302 | if (!dl) |
303 | return NULL; |
304 | |
305 | dl->dp = dp; |
306 | dl->link_dp = link_dp; |
307 | |
308 | INIT_LIST_HEAD(list: &dl->list); |
309 | list_add_tail(new: &dl->list, head: &dst->rtable); |
310 | |
311 | return dl; |
312 | } |
313 | |
314 | static bool dsa_port_setup_routing_table(struct dsa_port *dp) |
315 | { |
316 | struct dsa_switch *ds = dp->ds; |
317 | struct dsa_switch_tree *dst = ds->dst; |
318 | struct device_node *dn = dp->dn; |
319 | struct of_phandle_iterator it; |
320 | struct dsa_port *link_dp; |
321 | struct dsa_link *dl; |
322 | int err; |
323 | |
324 | of_for_each_phandle(&it, err, dn, "link" , NULL, 0) { |
325 | link_dp = dsa_tree_find_port_by_node(dst, dn: it.node); |
326 | if (!link_dp) { |
327 | of_node_put(node: it.node); |
328 | return false; |
329 | } |
330 | |
331 | dl = dsa_link_touch(dp, link_dp); |
332 | if (!dl) { |
333 | of_node_put(node: it.node); |
334 | return false; |
335 | } |
336 | } |
337 | |
338 | return true; |
339 | } |
340 | |
341 | static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst) |
342 | { |
343 | bool complete = true; |
344 | struct dsa_port *dp; |
345 | |
346 | list_for_each_entry(dp, &dst->ports, list) { |
347 | if (dsa_port_is_dsa(port: dp)) { |
348 | complete = dsa_port_setup_routing_table(dp); |
349 | if (!complete) |
350 | break; |
351 | } |
352 | } |
353 | |
354 | return complete; |
355 | } |
356 | |
357 | static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst) |
358 | { |
359 | struct dsa_port *dp; |
360 | |
361 | list_for_each_entry(dp, &dst->ports, list) |
362 | if (dsa_port_is_cpu(port: dp)) |
363 | return dp; |
364 | |
365 | return NULL; |
366 | } |
367 | |
368 | struct net_device *dsa_tree_find_first_conduit(struct dsa_switch_tree *dst) |
369 | { |
370 | struct device_node *ethernet; |
371 | struct net_device *conduit; |
372 | struct dsa_port *cpu_dp; |
373 | |
374 | cpu_dp = dsa_tree_find_first_cpu(dst); |
375 | ethernet = of_parse_phandle(np: cpu_dp->dn, phandle_name: "ethernet" , index: 0); |
376 | conduit = of_find_net_device_by_node(np: ethernet); |
377 | of_node_put(node: ethernet); |
378 | |
379 | return conduit; |
380 | } |
381 | |
382 | /* Assign the default CPU port (the first one in the tree) to all ports of the |
383 | * fabric which don't already have one as part of their own switch. |
384 | */ |
385 | static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst) |
386 | { |
387 | struct dsa_port *cpu_dp, *dp; |
388 | |
389 | cpu_dp = dsa_tree_find_first_cpu(dst); |
390 | if (!cpu_dp) { |
391 | pr_err("DSA: tree %d has no CPU port\n" , dst->index); |
392 | return -EINVAL; |
393 | } |
394 | |
395 | list_for_each_entry(dp, &dst->ports, list) { |
396 | if (dp->cpu_dp) |
397 | continue; |
398 | |
399 | if (dsa_port_is_user(dp) || dsa_port_is_dsa(port: dp)) |
400 | dp->cpu_dp = cpu_dp; |
401 | } |
402 | |
403 | return 0; |
404 | } |
405 | |
406 | static struct dsa_port * |
407 | dsa_switch_preferred_default_local_cpu_port(struct dsa_switch *ds) |
408 | { |
409 | struct dsa_port *cpu_dp; |
410 | |
411 | if (!ds->ops->preferred_default_local_cpu_port) |
412 | return NULL; |
413 | |
414 | cpu_dp = ds->ops->preferred_default_local_cpu_port(ds); |
415 | if (!cpu_dp) |
416 | return NULL; |
417 | |
418 | if (WARN_ON(!dsa_port_is_cpu(cpu_dp) || cpu_dp->ds != ds)) |
419 | return NULL; |
420 | |
421 | return cpu_dp; |
422 | } |
423 | |
424 | /* Perform initial assignment of CPU ports to user ports and DSA links in the |
425 | * fabric, giving preference to CPU ports local to each switch. Default to |
426 | * using the first CPU port in the switch tree if the port does not have a CPU |
427 | * port local to this switch. |
428 | */ |
429 | static int dsa_tree_setup_cpu_ports(struct dsa_switch_tree *dst) |
430 | { |
431 | struct dsa_port *preferred_cpu_dp, *cpu_dp, *dp; |
432 | |
433 | list_for_each_entry(cpu_dp, &dst->ports, list) { |
434 | if (!dsa_port_is_cpu(port: cpu_dp)) |
435 | continue; |
436 | |
437 | preferred_cpu_dp = dsa_switch_preferred_default_local_cpu_port(ds: cpu_dp->ds); |
438 | if (preferred_cpu_dp && preferred_cpu_dp != cpu_dp) |
439 | continue; |
440 | |
441 | /* Prefer a local CPU port */ |
442 | dsa_switch_for_each_port(dp, cpu_dp->ds) { |
443 | /* Prefer the first local CPU port found */ |
444 | if (dp->cpu_dp) |
445 | continue; |
446 | |
447 | if (dsa_port_is_user(dp) || dsa_port_is_dsa(port: dp)) |
448 | dp->cpu_dp = cpu_dp; |
449 | } |
450 | } |
451 | |
452 | return dsa_tree_setup_default_cpu(dst); |
453 | } |
454 | |
455 | static void dsa_tree_teardown_cpu_ports(struct dsa_switch_tree *dst) |
456 | { |
457 | struct dsa_port *dp; |
458 | |
459 | list_for_each_entry(dp, &dst->ports, list) |
460 | if (dsa_port_is_user(dp) || dsa_port_is_dsa(port: dp)) |
461 | dp->cpu_dp = NULL; |
462 | } |
463 | |
464 | static int dsa_port_setup(struct dsa_port *dp) |
465 | { |
466 | bool dsa_port_link_registered = false; |
467 | struct dsa_switch *ds = dp->ds; |
468 | bool dsa_port_enabled = false; |
469 | int err = 0; |
470 | |
471 | if (dp->setup) |
472 | return 0; |
473 | |
474 | err = dsa_port_devlink_setup(dp); |
475 | if (err) |
476 | return err; |
477 | |
478 | switch (dp->type) { |
479 | case DSA_PORT_TYPE_UNUSED: |
480 | dsa_port_disable(dp); |
481 | break; |
482 | case DSA_PORT_TYPE_CPU: |
483 | if (dp->dn) { |
484 | err = dsa_shared_port_link_register_of(dp); |
485 | if (err) |
486 | break; |
487 | dsa_port_link_registered = true; |
488 | } else { |
489 | dev_warn(ds->dev, |
490 | "skipping link registration for CPU port %d\n" , |
491 | dp->index); |
492 | } |
493 | |
494 | err = dsa_port_enable(dp, NULL); |
495 | if (err) |
496 | break; |
497 | dsa_port_enabled = true; |
498 | |
499 | break; |
500 | case DSA_PORT_TYPE_DSA: |
501 | if (dp->dn) { |
502 | err = dsa_shared_port_link_register_of(dp); |
503 | if (err) |
504 | break; |
505 | dsa_port_link_registered = true; |
506 | } else { |
507 | dev_warn(ds->dev, |
508 | "skipping link registration for DSA port %d\n" , |
509 | dp->index); |
510 | } |
511 | |
512 | err = dsa_port_enable(dp, NULL); |
513 | if (err) |
514 | break; |
515 | dsa_port_enabled = true; |
516 | |
517 | break; |
518 | case DSA_PORT_TYPE_USER: |
519 | of_get_mac_address(np: dp->dn, mac: dp->mac); |
520 | err = dsa_user_create(dp); |
521 | break; |
522 | } |
523 | |
524 | if (err && dsa_port_enabled) |
525 | dsa_port_disable(dp); |
526 | if (err && dsa_port_link_registered) |
527 | dsa_shared_port_link_unregister_of(dp); |
528 | if (err) { |
529 | dsa_port_devlink_teardown(dp); |
530 | return err; |
531 | } |
532 | |
533 | dp->setup = true; |
534 | |
535 | return 0; |
536 | } |
537 | |
538 | static void dsa_port_teardown(struct dsa_port *dp) |
539 | { |
540 | if (!dp->setup) |
541 | return; |
542 | |
543 | switch (dp->type) { |
544 | case DSA_PORT_TYPE_UNUSED: |
545 | break; |
546 | case DSA_PORT_TYPE_CPU: |
547 | dsa_port_disable(dp); |
548 | if (dp->dn) |
549 | dsa_shared_port_link_unregister_of(dp); |
550 | break; |
551 | case DSA_PORT_TYPE_DSA: |
552 | dsa_port_disable(dp); |
553 | if (dp->dn) |
554 | dsa_shared_port_link_unregister_of(dp); |
555 | break; |
556 | case DSA_PORT_TYPE_USER: |
557 | if (dp->user) { |
558 | dsa_user_destroy(user_dev: dp->user); |
559 | dp->user = NULL; |
560 | } |
561 | break; |
562 | } |
563 | |
564 | dsa_port_devlink_teardown(dp); |
565 | |
566 | dp->setup = false; |
567 | } |
568 | |
569 | static int dsa_port_setup_as_unused(struct dsa_port *dp) |
570 | { |
571 | dp->type = DSA_PORT_TYPE_UNUSED; |
572 | return dsa_port_setup(dp); |
573 | } |
574 | |
575 | static int dsa_switch_setup_tag_protocol(struct dsa_switch *ds) |
576 | { |
577 | const struct dsa_device_ops *tag_ops = ds->dst->tag_ops; |
578 | struct dsa_switch_tree *dst = ds->dst; |
579 | int err; |
580 | |
581 | if (tag_ops->proto == dst->default_proto) |
582 | goto connect; |
583 | |
584 | rtnl_lock(); |
585 | err = ds->ops->change_tag_protocol(ds, tag_ops->proto); |
586 | rtnl_unlock(); |
587 | if (err) { |
588 | dev_err(ds->dev, "Unable to use tag protocol \"%s\": %pe\n" , |
589 | tag_ops->name, ERR_PTR(err)); |
590 | return err; |
591 | } |
592 | |
593 | connect: |
594 | if (tag_ops->connect) { |
595 | err = tag_ops->connect(ds); |
596 | if (err) |
597 | return err; |
598 | } |
599 | |
600 | if (ds->ops->connect_tag_protocol) { |
601 | err = ds->ops->connect_tag_protocol(ds, tag_ops->proto); |
602 | if (err) { |
603 | dev_err(ds->dev, |
604 | "Unable to connect to tag protocol \"%s\": %pe\n" , |
605 | tag_ops->name, ERR_PTR(err)); |
606 | goto disconnect; |
607 | } |
608 | } |
609 | |
610 | return 0; |
611 | |
612 | disconnect: |
613 | if (tag_ops->disconnect) |
614 | tag_ops->disconnect(ds); |
615 | |
616 | return err; |
617 | } |
618 | |
619 | static void dsa_switch_teardown_tag_protocol(struct dsa_switch *ds) |
620 | { |
621 | const struct dsa_device_ops *tag_ops = ds->dst->tag_ops; |
622 | |
623 | if (tag_ops->disconnect) |
624 | tag_ops->disconnect(ds); |
625 | } |
626 | |
627 | static int dsa_switch_setup(struct dsa_switch *ds) |
628 | { |
629 | struct device_node *dn; |
630 | int err; |
631 | |
632 | if (ds->setup) |
633 | return 0; |
634 | |
635 | /* Initialize ds->phys_mii_mask before registering the user MDIO bus |
636 | * driver and before ops->setup() has run, since the switch drivers and |
637 | * the user MDIO bus driver rely on these values for probing PHY |
638 | * devices or not |
639 | */ |
640 | ds->phys_mii_mask |= dsa_user_ports(ds); |
641 | |
642 | err = dsa_switch_devlink_alloc(ds); |
643 | if (err) |
644 | return err; |
645 | |
646 | err = dsa_switch_register_notifier(ds); |
647 | if (err) |
648 | goto devlink_free; |
649 | |
650 | ds->configure_vlan_while_not_filtering = true; |
651 | |
652 | err = ds->ops->setup(ds); |
653 | if (err < 0) |
654 | goto unregister_notifier; |
655 | |
656 | err = dsa_switch_setup_tag_protocol(ds); |
657 | if (err) |
658 | goto teardown; |
659 | |
660 | if (!ds->user_mii_bus && ds->ops->phy_read) { |
661 | ds->user_mii_bus = mdiobus_alloc(); |
662 | if (!ds->user_mii_bus) { |
663 | err = -ENOMEM; |
664 | goto teardown; |
665 | } |
666 | |
667 | dsa_user_mii_bus_init(ds); |
668 | |
669 | dn = of_get_child_by_name(node: ds->dev->of_node, name: "mdio" ); |
670 | |
671 | err = of_mdiobus_register(mdio: ds->user_mii_bus, np: dn); |
672 | of_node_put(node: dn); |
673 | if (err < 0) |
674 | goto free_user_mii_bus; |
675 | } |
676 | |
677 | dsa_switch_devlink_register(ds); |
678 | |
679 | ds->setup = true; |
680 | return 0; |
681 | |
682 | free_user_mii_bus: |
683 | if (ds->user_mii_bus && ds->ops->phy_read) |
684 | mdiobus_free(bus: ds->user_mii_bus); |
685 | teardown: |
686 | if (ds->ops->teardown) |
687 | ds->ops->teardown(ds); |
688 | unregister_notifier: |
689 | dsa_switch_unregister_notifier(ds); |
690 | devlink_free: |
691 | dsa_switch_devlink_free(ds); |
692 | return err; |
693 | } |
694 | |
695 | static void dsa_switch_teardown(struct dsa_switch *ds) |
696 | { |
697 | if (!ds->setup) |
698 | return; |
699 | |
700 | dsa_switch_devlink_unregister(ds); |
701 | |
702 | if (ds->user_mii_bus && ds->ops->phy_read) { |
703 | mdiobus_unregister(bus: ds->user_mii_bus); |
704 | mdiobus_free(bus: ds->user_mii_bus); |
705 | ds->user_mii_bus = NULL; |
706 | } |
707 | |
708 | dsa_switch_teardown_tag_protocol(ds); |
709 | |
710 | if (ds->ops->teardown) |
711 | ds->ops->teardown(ds); |
712 | |
713 | dsa_switch_unregister_notifier(ds); |
714 | |
715 | dsa_switch_devlink_free(ds); |
716 | |
717 | ds->setup = false; |
718 | } |
719 | |
720 | /* First tear down the non-shared, then the shared ports. This ensures that |
721 | * all work items scheduled by our switchdev handlers for user ports have |
722 | * completed before we destroy the refcounting kept on the shared ports. |
723 | */ |
724 | static void dsa_tree_teardown_ports(struct dsa_switch_tree *dst) |
725 | { |
726 | struct dsa_port *dp; |
727 | |
728 | list_for_each_entry(dp, &dst->ports, list) |
729 | if (dsa_port_is_user(dp) || dsa_port_is_unused(dp)) |
730 | dsa_port_teardown(dp); |
731 | |
732 | dsa_flush_workqueue(); |
733 | |
734 | list_for_each_entry(dp, &dst->ports, list) |
735 | if (dsa_port_is_dsa(port: dp) || dsa_port_is_cpu(port: dp)) |
736 | dsa_port_teardown(dp); |
737 | } |
738 | |
739 | static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst) |
740 | { |
741 | struct dsa_port *dp; |
742 | |
743 | list_for_each_entry(dp, &dst->ports, list) |
744 | dsa_switch_teardown(ds: dp->ds); |
745 | } |
746 | |
747 | /* Bring shared ports up first, then non-shared ports */ |
748 | static int dsa_tree_setup_ports(struct dsa_switch_tree *dst) |
749 | { |
750 | struct dsa_port *dp; |
751 | int err = 0; |
752 | |
753 | list_for_each_entry(dp, &dst->ports, list) { |
754 | if (dsa_port_is_dsa(port: dp) || dsa_port_is_cpu(port: dp)) { |
755 | err = dsa_port_setup(dp); |
756 | if (err) |
757 | goto teardown; |
758 | } |
759 | } |
760 | |
761 | list_for_each_entry(dp, &dst->ports, list) { |
762 | if (dsa_port_is_user(dp) || dsa_port_is_unused(dp)) { |
763 | err = dsa_port_setup(dp); |
764 | if (err) { |
765 | err = dsa_port_setup_as_unused(dp); |
766 | if (err) |
767 | goto teardown; |
768 | } |
769 | } |
770 | } |
771 | |
772 | return 0; |
773 | |
774 | teardown: |
775 | dsa_tree_teardown_ports(dst); |
776 | |
777 | return err; |
778 | } |
779 | |
780 | static int dsa_tree_setup_switches(struct dsa_switch_tree *dst) |
781 | { |
782 | struct dsa_port *dp; |
783 | int err = 0; |
784 | |
785 | list_for_each_entry(dp, &dst->ports, list) { |
786 | err = dsa_switch_setup(ds: dp->ds); |
787 | if (err) { |
788 | dsa_tree_teardown_switches(dst); |
789 | break; |
790 | } |
791 | } |
792 | |
793 | return err; |
794 | } |
795 | |
796 | static int dsa_tree_setup_conduit(struct dsa_switch_tree *dst) |
797 | { |
798 | struct dsa_port *cpu_dp; |
799 | int err = 0; |
800 | |
801 | rtnl_lock(); |
802 | |
803 | dsa_tree_for_each_cpu_port(cpu_dp, dst) { |
804 | struct net_device *conduit = cpu_dp->conduit; |
805 | bool admin_up = (conduit->flags & IFF_UP) && |
806 | !qdisc_tx_is_noop(dev: conduit); |
807 | |
808 | err = dsa_conduit_setup(dev: conduit, cpu_dp); |
809 | if (err) |
810 | break; |
811 | |
812 | /* Replay conduit state event */ |
813 | dsa_tree_conduit_admin_state_change(dst, conduit, up: admin_up); |
814 | dsa_tree_conduit_oper_state_change(dst, conduit, |
815 | up: netif_oper_up(dev: conduit)); |
816 | } |
817 | |
818 | rtnl_unlock(); |
819 | |
820 | return err; |
821 | } |
822 | |
823 | static void dsa_tree_teardown_conduit(struct dsa_switch_tree *dst) |
824 | { |
825 | struct dsa_port *cpu_dp; |
826 | |
827 | rtnl_lock(); |
828 | |
829 | dsa_tree_for_each_cpu_port(cpu_dp, dst) { |
830 | struct net_device *conduit = cpu_dp->conduit; |
831 | |
832 | /* Synthesizing an "admin down" state is sufficient for |
833 | * the switches to get a notification if the conduit is |
834 | * currently up and running. |
835 | */ |
836 | dsa_tree_conduit_admin_state_change(dst, conduit, up: false); |
837 | |
838 | dsa_conduit_teardown(dev: conduit); |
839 | } |
840 | |
841 | rtnl_unlock(); |
842 | } |
843 | |
844 | static int dsa_tree_setup_lags(struct dsa_switch_tree *dst) |
845 | { |
846 | unsigned int len = 0; |
847 | struct dsa_port *dp; |
848 | |
849 | list_for_each_entry(dp, &dst->ports, list) { |
850 | if (dp->ds->num_lag_ids > len) |
851 | len = dp->ds->num_lag_ids; |
852 | } |
853 | |
854 | if (!len) |
855 | return 0; |
856 | |
857 | dst->lags = kcalloc(n: len, size: sizeof(*dst->lags), GFP_KERNEL); |
858 | if (!dst->lags) |
859 | return -ENOMEM; |
860 | |
861 | dst->lags_len = len; |
862 | return 0; |
863 | } |
864 | |
865 | static void dsa_tree_teardown_lags(struct dsa_switch_tree *dst) |
866 | { |
867 | kfree(objp: dst->lags); |
868 | } |
869 | |
870 | static int dsa_tree_setup(struct dsa_switch_tree *dst) |
871 | { |
872 | bool complete; |
873 | int err; |
874 | |
875 | if (dst->setup) { |
876 | pr_err("DSA: tree %d already setup! Disjoint trees?\n" , |
877 | dst->index); |
878 | return -EEXIST; |
879 | } |
880 | |
881 | complete = dsa_tree_setup_routing_table(dst); |
882 | if (!complete) |
883 | return 0; |
884 | |
885 | err = dsa_tree_setup_cpu_ports(dst); |
886 | if (err) |
887 | return err; |
888 | |
889 | err = dsa_tree_setup_switches(dst); |
890 | if (err) |
891 | goto teardown_cpu_ports; |
892 | |
893 | err = dsa_tree_setup_ports(dst); |
894 | if (err) |
895 | goto teardown_switches; |
896 | |
897 | err = dsa_tree_setup_conduit(dst); |
898 | if (err) |
899 | goto teardown_ports; |
900 | |
901 | err = dsa_tree_setup_lags(dst); |
902 | if (err) |
903 | goto teardown_conduit; |
904 | |
905 | dst->setup = true; |
906 | |
907 | pr_info("DSA: tree %d setup\n" , dst->index); |
908 | |
909 | return 0; |
910 | |
911 | teardown_conduit: |
912 | dsa_tree_teardown_conduit(dst); |
913 | teardown_ports: |
914 | dsa_tree_teardown_ports(dst); |
915 | teardown_switches: |
916 | dsa_tree_teardown_switches(dst); |
917 | teardown_cpu_ports: |
918 | dsa_tree_teardown_cpu_ports(dst); |
919 | |
920 | return err; |
921 | } |
922 | |
923 | static void dsa_tree_teardown(struct dsa_switch_tree *dst) |
924 | { |
925 | struct dsa_link *dl, *next; |
926 | |
927 | if (!dst->setup) |
928 | return; |
929 | |
930 | dsa_tree_teardown_lags(dst); |
931 | |
932 | dsa_tree_teardown_conduit(dst); |
933 | |
934 | dsa_tree_teardown_ports(dst); |
935 | |
936 | dsa_tree_teardown_switches(dst); |
937 | |
938 | dsa_tree_teardown_cpu_ports(dst); |
939 | |
940 | list_for_each_entry_safe(dl, next, &dst->rtable, list) { |
941 | list_del(entry: &dl->list); |
942 | kfree(objp: dl); |
943 | } |
944 | |
945 | pr_info("DSA: tree %d torn down\n" , dst->index); |
946 | |
947 | dst->setup = false; |
948 | } |
949 | |
950 | static int dsa_tree_bind_tag_proto(struct dsa_switch_tree *dst, |
951 | const struct dsa_device_ops *tag_ops) |
952 | { |
953 | const struct dsa_device_ops *old_tag_ops = dst->tag_ops; |
954 | struct dsa_notifier_tag_proto_info info; |
955 | int err; |
956 | |
957 | dst->tag_ops = tag_ops; |
958 | |
959 | /* Notify the switches from this tree about the connection |
960 | * to the new tagger |
961 | */ |
962 | info.tag_ops = tag_ops; |
963 | err = dsa_tree_notify(dst, e: DSA_NOTIFIER_TAG_PROTO_CONNECT, v: &info); |
964 | if (err && err != -EOPNOTSUPP) |
965 | goto out_disconnect; |
966 | |
967 | /* Notify the old tagger about the disconnection from this tree */ |
968 | info.tag_ops = old_tag_ops; |
969 | dsa_tree_notify(dst, e: DSA_NOTIFIER_TAG_PROTO_DISCONNECT, v: &info); |
970 | |
971 | return 0; |
972 | |
973 | out_disconnect: |
974 | info.tag_ops = tag_ops; |
975 | dsa_tree_notify(dst, e: DSA_NOTIFIER_TAG_PROTO_DISCONNECT, v: &info); |
976 | dst->tag_ops = old_tag_ops; |
977 | |
978 | return err; |
979 | } |
980 | |
981 | /* Since the dsa/tagging sysfs device attribute is per conduit, the assumption |
982 | * is that all DSA switches within a tree share the same tagger, otherwise |
983 | * they would have formed disjoint trees (different "dsa,member" values). |
984 | */ |
985 | int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst, |
986 | const struct dsa_device_ops *tag_ops, |
987 | const struct dsa_device_ops *old_tag_ops) |
988 | { |
989 | struct dsa_notifier_tag_proto_info info; |
990 | struct dsa_port *dp; |
991 | int err = -EBUSY; |
992 | |
993 | if (!rtnl_trylock()) |
994 | return restart_syscall(); |
995 | |
996 | /* At the moment we don't allow changing the tag protocol under |
997 | * traffic. The rtnl_mutex also happens to serialize concurrent |
998 | * attempts to change the tagging protocol. If we ever lift the IFF_UP |
999 | * restriction, there needs to be another mutex which serializes this. |
1000 | */ |
1001 | dsa_tree_for_each_user_port(dp, dst) { |
1002 | if (dsa_port_to_conduit(dp)->flags & IFF_UP) |
1003 | goto out_unlock; |
1004 | |
1005 | if (dp->user->flags & IFF_UP) |
1006 | goto out_unlock; |
1007 | } |
1008 | |
1009 | /* Notify the tag protocol change */ |
1010 | info.tag_ops = tag_ops; |
1011 | err = dsa_tree_notify(dst, e: DSA_NOTIFIER_TAG_PROTO, v: &info); |
1012 | if (err) |
1013 | goto out_unwind_tagger; |
1014 | |
1015 | err = dsa_tree_bind_tag_proto(dst, tag_ops); |
1016 | if (err) |
1017 | goto out_unwind_tagger; |
1018 | |
1019 | rtnl_unlock(); |
1020 | |
1021 | return 0; |
1022 | |
1023 | out_unwind_tagger: |
1024 | info.tag_ops = old_tag_ops; |
1025 | dsa_tree_notify(dst, e: DSA_NOTIFIER_TAG_PROTO, v: &info); |
1026 | out_unlock: |
1027 | rtnl_unlock(); |
1028 | return err; |
1029 | } |
1030 | |
1031 | static void dsa_tree_conduit_state_change(struct dsa_switch_tree *dst, |
1032 | struct net_device *conduit) |
1033 | { |
1034 | struct dsa_notifier_conduit_state_info info; |
1035 | struct dsa_port *cpu_dp = conduit->dsa_ptr; |
1036 | |
1037 | info.conduit = conduit; |
1038 | info.operational = dsa_port_conduit_is_operational(dp: cpu_dp); |
1039 | |
1040 | dsa_tree_notify(dst, e: DSA_NOTIFIER_CONDUIT_STATE_CHANGE, v: &info); |
1041 | } |
1042 | |
1043 | void dsa_tree_conduit_admin_state_change(struct dsa_switch_tree *dst, |
1044 | struct net_device *conduit, |
1045 | bool up) |
1046 | { |
1047 | struct dsa_port *cpu_dp = conduit->dsa_ptr; |
1048 | bool notify = false; |
1049 | |
1050 | /* Don't keep track of admin state on LAG DSA conduits, |
1051 | * but rather just of physical DSA conduits |
1052 | */ |
1053 | if (netif_is_lag_master(dev: conduit)) |
1054 | return; |
1055 | |
1056 | if ((dsa_port_conduit_is_operational(dp: cpu_dp)) != |
1057 | (up && cpu_dp->conduit_oper_up)) |
1058 | notify = true; |
1059 | |
1060 | cpu_dp->conduit_admin_up = up; |
1061 | |
1062 | if (notify) |
1063 | dsa_tree_conduit_state_change(dst, conduit); |
1064 | } |
1065 | |
1066 | void dsa_tree_conduit_oper_state_change(struct dsa_switch_tree *dst, |
1067 | struct net_device *conduit, |
1068 | bool up) |
1069 | { |
1070 | struct dsa_port *cpu_dp = conduit->dsa_ptr; |
1071 | bool notify = false; |
1072 | |
1073 | /* Don't keep track of oper state on LAG DSA conduits, |
1074 | * but rather just of physical DSA conduits |
1075 | */ |
1076 | if (netif_is_lag_master(dev: conduit)) |
1077 | return; |
1078 | |
1079 | if ((dsa_port_conduit_is_operational(dp: cpu_dp)) != |
1080 | (cpu_dp->conduit_admin_up && up)) |
1081 | notify = true; |
1082 | |
1083 | cpu_dp->conduit_oper_up = up; |
1084 | |
1085 | if (notify) |
1086 | dsa_tree_conduit_state_change(dst, conduit); |
1087 | } |
1088 | |
1089 | static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index) |
1090 | { |
1091 | struct dsa_switch_tree *dst = ds->dst; |
1092 | struct dsa_port *dp; |
1093 | |
1094 | dsa_switch_for_each_port(dp, ds) |
1095 | if (dp->index == index) |
1096 | return dp; |
1097 | |
1098 | dp = kzalloc(size: sizeof(*dp), GFP_KERNEL); |
1099 | if (!dp) |
1100 | return NULL; |
1101 | |
1102 | dp->ds = ds; |
1103 | dp->index = index; |
1104 | |
1105 | mutex_init(&dp->addr_lists_lock); |
1106 | mutex_init(&dp->vlans_lock); |
1107 | INIT_LIST_HEAD(list: &dp->fdbs); |
1108 | INIT_LIST_HEAD(list: &dp->mdbs); |
1109 | INIT_LIST_HEAD(list: &dp->vlans); /* also initializes &dp->user_vlans */ |
1110 | INIT_LIST_HEAD(list: &dp->list); |
1111 | list_add_tail(new: &dp->list, head: &dst->ports); |
1112 | |
1113 | return dp; |
1114 | } |
1115 | |
1116 | static int dsa_port_parse_user(struct dsa_port *dp, const char *name) |
1117 | { |
1118 | dp->type = DSA_PORT_TYPE_USER; |
1119 | dp->name = name; |
1120 | |
1121 | return 0; |
1122 | } |
1123 | |
1124 | static int dsa_port_parse_dsa(struct dsa_port *dp) |
1125 | { |
1126 | dp->type = DSA_PORT_TYPE_DSA; |
1127 | |
1128 | return 0; |
1129 | } |
1130 | |
1131 | static enum dsa_tag_protocol dsa_get_tag_protocol(struct dsa_port *dp, |
1132 | struct net_device *conduit) |
1133 | { |
1134 | enum dsa_tag_protocol tag_protocol = DSA_TAG_PROTO_NONE; |
1135 | struct dsa_switch *mds, *ds = dp->ds; |
1136 | unsigned int mdp_upstream; |
1137 | struct dsa_port *mdp; |
1138 | |
1139 | /* It is possible to stack DSA switches onto one another when that |
1140 | * happens the switch driver may want to know if its tagging protocol |
1141 | * is going to work in such a configuration. |
1142 | */ |
1143 | if (dsa_user_dev_check(dev: conduit)) { |
1144 | mdp = dsa_user_to_port(dev: conduit); |
1145 | mds = mdp->ds; |
1146 | mdp_upstream = dsa_upstream_port(ds: mds, port: mdp->index); |
1147 | tag_protocol = mds->ops->get_tag_protocol(mds, mdp_upstream, |
1148 | DSA_TAG_PROTO_NONE); |
1149 | } |
1150 | |
1151 | /* If the conduit device is not itself a DSA user in a disjoint DSA |
1152 | * tree, then return immediately. |
1153 | */ |
1154 | return ds->ops->get_tag_protocol(ds, dp->index, tag_protocol); |
1155 | } |
1156 | |
1157 | static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *conduit, |
1158 | const char *user_protocol) |
1159 | { |
1160 | const struct dsa_device_ops *tag_ops = NULL; |
1161 | struct dsa_switch *ds = dp->ds; |
1162 | struct dsa_switch_tree *dst = ds->dst; |
1163 | enum dsa_tag_protocol default_proto; |
1164 | |
1165 | /* Find out which protocol the switch would prefer. */ |
1166 | default_proto = dsa_get_tag_protocol(dp, conduit); |
1167 | if (dst->default_proto) { |
1168 | if (dst->default_proto != default_proto) { |
1169 | dev_err(ds->dev, |
1170 | "A DSA switch tree can have only one tagging protocol\n" ); |
1171 | return -EINVAL; |
1172 | } |
1173 | } else { |
1174 | dst->default_proto = default_proto; |
1175 | } |
1176 | |
1177 | /* See if the user wants to override that preference. */ |
1178 | if (user_protocol) { |
1179 | if (!ds->ops->change_tag_protocol) { |
1180 | dev_err(ds->dev, "Tag protocol cannot be modified\n" ); |
1181 | return -EINVAL; |
1182 | } |
1183 | |
1184 | tag_ops = dsa_tag_driver_get_by_name(name: user_protocol); |
1185 | if (IS_ERR(ptr: tag_ops)) { |
1186 | dev_warn(ds->dev, |
1187 | "Failed to find a tagging driver for protocol %s, using default\n" , |
1188 | user_protocol); |
1189 | tag_ops = NULL; |
1190 | } |
1191 | } |
1192 | |
1193 | if (!tag_ops) |
1194 | tag_ops = dsa_tag_driver_get_by_id(tag_protocol: default_proto); |
1195 | |
1196 | if (IS_ERR(ptr: tag_ops)) { |
1197 | if (PTR_ERR(ptr: tag_ops) == -ENOPROTOOPT) |
1198 | return -EPROBE_DEFER; |
1199 | |
1200 | dev_warn(ds->dev, "No tagger for this switch\n" ); |
1201 | return PTR_ERR(ptr: tag_ops); |
1202 | } |
1203 | |
1204 | if (dst->tag_ops) { |
1205 | if (dst->tag_ops != tag_ops) { |
1206 | dev_err(ds->dev, |
1207 | "A DSA switch tree can have only one tagging protocol\n" ); |
1208 | |
1209 | dsa_tag_driver_put(ops: tag_ops); |
1210 | return -EINVAL; |
1211 | } |
1212 | |
1213 | /* In the case of multiple CPU ports per switch, the tagging |
1214 | * protocol is still reference-counted only per switch tree. |
1215 | */ |
1216 | dsa_tag_driver_put(ops: tag_ops); |
1217 | } else { |
1218 | dst->tag_ops = tag_ops; |
1219 | } |
1220 | |
1221 | dp->conduit = conduit; |
1222 | dp->type = DSA_PORT_TYPE_CPU; |
1223 | dsa_port_set_tag_protocol(cpu_dp: dp, tag_ops: dst->tag_ops); |
1224 | dp->dst = dst; |
1225 | |
1226 | /* At this point, the tree may be configured to use a different |
1227 | * tagger than the one chosen by the switch driver during |
1228 | * .setup, in the case when a user selects a custom protocol |
1229 | * through the DT. |
1230 | * |
1231 | * This is resolved by syncing the driver with the tree in |
1232 | * dsa_switch_setup_tag_protocol once .setup has run and the |
1233 | * driver is ready to accept calls to .change_tag_protocol. If |
1234 | * the driver does not support the custom protocol at that |
1235 | * point, the tree is wholly rejected, thereby ensuring that the |
1236 | * tree and driver are always in agreement on the protocol to |
1237 | * use. |
1238 | */ |
1239 | return 0; |
1240 | } |
1241 | |
1242 | static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn) |
1243 | { |
1244 | struct device_node *ethernet = of_parse_phandle(np: dn, phandle_name: "ethernet" , index: 0); |
1245 | const char *name = of_get_property(node: dn, name: "label" , NULL); |
1246 | bool link = of_property_read_bool(np: dn, propname: "link" ); |
1247 | |
1248 | dp->dn = dn; |
1249 | |
1250 | if (ethernet) { |
1251 | struct net_device *conduit; |
1252 | const char *user_protocol; |
1253 | |
1254 | conduit = of_find_net_device_by_node(np: ethernet); |
1255 | of_node_put(node: ethernet); |
1256 | if (!conduit) |
1257 | return -EPROBE_DEFER; |
1258 | |
1259 | user_protocol = of_get_property(node: dn, name: "dsa-tag-protocol" , NULL); |
1260 | return dsa_port_parse_cpu(dp, conduit, user_protocol); |
1261 | } |
1262 | |
1263 | if (link) |
1264 | return dsa_port_parse_dsa(dp); |
1265 | |
1266 | return dsa_port_parse_user(dp, name); |
1267 | } |
1268 | |
1269 | static int dsa_switch_parse_ports_of(struct dsa_switch *ds, |
1270 | struct device_node *dn) |
1271 | { |
1272 | struct device_node *ports, *port; |
1273 | struct dsa_port *dp; |
1274 | int err = 0; |
1275 | u32 reg; |
1276 | |
1277 | ports = of_get_child_by_name(node: dn, name: "ports" ); |
1278 | if (!ports) { |
1279 | /* The second possibility is "ethernet-ports" */ |
1280 | ports = of_get_child_by_name(node: dn, name: "ethernet-ports" ); |
1281 | if (!ports) { |
1282 | dev_err(ds->dev, "no ports child node found\n" ); |
1283 | return -EINVAL; |
1284 | } |
1285 | } |
1286 | |
1287 | for_each_available_child_of_node(ports, port) { |
1288 | err = of_property_read_u32(np: port, propname: "reg" , out_value: ®); |
1289 | if (err) { |
1290 | of_node_put(node: port); |
1291 | goto out_put_node; |
1292 | } |
1293 | |
1294 | if (reg >= ds->num_ports) { |
1295 | dev_err(ds->dev, "port %pOF index %u exceeds num_ports (%u)\n" , |
1296 | port, reg, ds->num_ports); |
1297 | of_node_put(node: port); |
1298 | err = -EINVAL; |
1299 | goto out_put_node; |
1300 | } |
1301 | |
1302 | dp = dsa_to_port(ds, p: reg); |
1303 | |
1304 | err = dsa_port_parse_of(dp, dn: port); |
1305 | if (err) { |
1306 | of_node_put(node: port); |
1307 | goto out_put_node; |
1308 | } |
1309 | } |
1310 | |
1311 | out_put_node: |
1312 | of_node_put(node: ports); |
1313 | return err; |
1314 | } |
1315 | |
1316 | static int dsa_switch_parse_member_of(struct dsa_switch *ds, |
1317 | struct device_node *dn) |
1318 | { |
1319 | u32 m[2] = { 0, 0 }; |
1320 | int sz; |
1321 | |
1322 | /* Don't error out if this optional property isn't found */ |
1323 | sz = of_property_read_variable_u32_array(np: dn, propname: "dsa,member" , out_values: m, sz_min: 2, sz_max: 2); |
1324 | if (sz < 0 && sz != -EINVAL) |
1325 | return sz; |
1326 | |
1327 | ds->index = m[1]; |
1328 | |
1329 | ds->dst = dsa_tree_touch(index: m[0]); |
1330 | if (!ds->dst) |
1331 | return -ENOMEM; |
1332 | |
1333 | if (dsa_switch_find(ds->dst->index, ds->index)) { |
1334 | dev_err(ds->dev, |
1335 | "A DSA switch with index %d already exists in tree %d\n" , |
1336 | ds->index, ds->dst->index); |
1337 | return -EEXIST; |
1338 | } |
1339 | |
1340 | if (ds->dst->last_switch < ds->index) |
1341 | ds->dst->last_switch = ds->index; |
1342 | |
1343 | return 0; |
1344 | } |
1345 | |
1346 | static int dsa_switch_touch_ports(struct dsa_switch *ds) |
1347 | { |
1348 | struct dsa_port *dp; |
1349 | int port; |
1350 | |
1351 | for (port = 0; port < ds->num_ports; port++) { |
1352 | dp = dsa_port_touch(ds, index: port); |
1353 | if (!dp) |
1354 | return -ENOMEM; |
1355 | } |
1356 | |
1357 | return 0; |
1358 | } |
1359 | |
1360 | static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn) |
1361 | { |
1362 | int err; |
1363 | |
1364 | err = dsa_switch_parse_member_of(ds, dn); |
1365 | if (err) |
1366 | return err; |
1367 | |
1368 | err = dsa_switch_touch_ports(ds); |
1369 | if (err) |
1370 | return err; |
1371 | |
1372 | return dsa_switch_parse_ports_of(ds, dn); |
1373 | } |
1374 | |
1375 | static int dev_is_class(struct device *dev, void *class) |
1376 | { |
1377 | if (dev->class != NULL && !strcmp(dev->class->name, class)) |
1378 | return 1; |
1379 | |
1380 | return 0; |
1381 | } |
1382 | |
1383 | static struct device *dev_find_class(struct device *parent, char *class) |
1384 | { |
1385 | if (dev_is_class(dev: parent, class)) { |
1386 | get_device(dev: parent); |
1387 | return parent; |
1388 | } |
1389 | |
1390 | return device_find_child(dev: parent, data: class, match: dev_is_class); |
1391 | } |
1392 | |
1393 | static struct net_device *dsa_dev_to_net_device(struct device *dev) |
1394 | { |
1395 | struct device *d; |
1396 | |
1397 | d = dev_find_class(parent: dev, class: "net" ); |
1398 | if (d != NULL) { |
1399 | struct net_device *nd; |
1400 | |
1401 | nd = to_net_dev(d); |
1402 | dev_hold(dev: nd); |
1403 | put_device(dev: d); |
1404 | |
1405 | return nd; |
1406 | } |
1407 | |
1408 | return NULL; |
1409 | } |
1410 | |
1411 | static int dsa_port_parse(struct dsa_port *dp, const char *name, |
1412 | struct device *dev) |
1413 | { |
1414 | if (!strcmp(name, "cpu" )) { |
1415 | struct net_device *conduit; |
1416 | |
1417 | conduit = dsa_dev_to_net_device(dev); |
1418 | if (!conduit) |
1419 | return -EPROBE_DEFER; |
1420 | |
1421 | dev_put(dev: conduit); |
1422 | |
1423 | return dsa_port_parse_cpu(dp, conduit, NULL); |
1424 | } |
1425 | |
1426 | if (!strcmp(name, "dsa" )) |
1427 | return dsa_port_parse_dsa(dp); |
1428 | |
1429 | return dsa_port_parse_user(dp, name); |
1430 | } |
1431 | |
1432 | static int dsa_switch_parse_ports(struct dsa_switch *ds, |
1433 | struct dsa_chip_data *cd) |
1434 | { |
1435 | bool valid_name_found = false; |
1436 | struct dsa_port *dp; |
1437 | struct device *dev; |
1438 | const char *name; |
1439 | unsigned int i; |
1440 | int err; |
1441 | |
1442 | for (i = 0; i < DSA_MAX_PORTS; i++) { |
1443 | name = cd->port_names[i]; |
1444 | dev = cd->netdev[i]; |
1445 | dp = dsa_to_port(ds, p: i); |
1446 | |
1447 | if (!name) |
1448 | continue; |
1449 | |
1450 | err = dsa_port_parse(dp, name, dev); |
1451 | if (err) |
1452 | return err; |
1453 | |
1454 | valid_name_found = true; |
1455 | } |
1456 | |
1457 | if (!valid_name_found && i == DSA_MAX_PORTS) |
1458 | return -EINVAL; |
1459 | |
1460 | return 0; |
1461 | } |
1462 | |
1463 | static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd) |
1464 | { |
1465 | int err; |
1466 | |
1467 | ds->cd = cd; |
1468 | |
1469 | /* We don't support interconnected switches nor multiple trees via |
1470 | * platform data, so this is the unique switch of the tree. |
1471 | */ |
1472 | ds->index = 0; |
1473 | ds->dst = dsa_tree_touch(index: 0); |
1474 | if (!ds->dst) |
1475 | return -ENOMEM; |
1476 | |
1477 | err = dsa_switch_touch_ports(ds); |
1478 | if (err) |
1479 | return err; |
1480 | |
1481 | return dsa_switch_parse_ports(ds, cd); |
1482 | } |
1483 | |
1484 | static void dsa_switch_release_ports(struct dsa_switch *ds) |
1485 | { |
1486 | struct dsa_port *dp, *next; |
1487 | |
1488 | dsa_switch_for_each_port_safe(dp, next, ds) { |
1489 | WARN_ON(!list_empty(&dp->fdbs)); |
1490 | WARN_ON(!list_empty(&dp->mdbs)); |
1491 | WARN_ON(!list_empty(&dp->vlans)); |
1492 | list_del(entry: &dp->list); |
1493 | kfree(objp: dp); |
1494 | } |
1495 | } |
1496 | |
1497 | static int dsa_switch_probe(struct dsa_switch *ds) |
1498 | { |
1499 | struct dsa_switch_tree *dst; |
1500 | struct dsa_chip_data *pdata; |
1501 | struct device_node *np; |
1502 | int err; |
1503 | |
1504 | if (!ds->dev) |
1505 | return -ENODEV; |
1506 | |
1507 | pdata = ds->dev->platform_data; |
1508 | np = ds->dev->of_node; |
1509 | |
1510 | if (!ds->num_ports) |
1511 | return -EINVAL; |
1512 | |
1513 | if (np) { |
1514 | err = dsa_switch_parse_of(ds, dn: np); |
1515 | if (err) |
1516 | dsa_switch_release_ports(ds); |
1517 | } else if (pdata) { |
1518 | err = dsa_switch_parse(ds, cd: pdata); |
1519 | if (err) |
1520 | dsa_switch_release_ports(ds); |
1521 | } else { |
1522 | err = -ENODEV; |
1523 | } |
1524 | |
1525 | if (err) |
1526 | return err; |
1527 | |
1528 | dst = ds->dst; |
1529 | dsa_tree_get(dst); |
1530 | err = dsa_tree_setup(dst); |
1531 | if (err) { |
1532 | dsa_switch_release_ports(ds); |
1533 | dsa_tree_put(dst); |
1534 | } |
1535 | |
1536 | return err; |
1537 | } |
1538 | |
1539 | int dsa_register_switch(struct dsa_switch *ds) |
1540 | { |
1541 | int err; |
1542 | |
1543 | mutex_lock(&dsa2_mutex); |
1544 | err = dsa_switch_probe(ds); |
1545 | dsa_tree_put(dst: ds->dst); |
1546 | mutex_unlock(lock: &dsa2_mutex); |
1547 | |
1548 | return err; |
1549 | } |
1550 | EXPORT_SYMBOL_GPL(dsa_register_switch); |
1551 | |
1552 | static void dsa_switch_remove(struct dsa_switch *ds) |
1553 | { |
1554 | struct dsa_switch_tree *dst = ds->dst; |
1555 | |
1556 | dsa_tree_teardown(dst); |
1557 | dsa_switch_release_ports(ds); |
1558 | dsa_tree_put(dst); |
1559 | } |
1560 | |
1561 | void dsa_unregister_switch(struct dsa_switch *ds) |
1562 | { |
1563 | mutex_lock(&dsa2_mutex); |
1564 | dsa_switch_remove(ds); |
1565 | mutex_unlock(lock: &dsa2_mutex); |
1566 | } |
1567 | EXPORT_SYMBOL_GPL(dsa_unregister_switch); |
1568 | |
1569 | /* If the DSA conduit chooses to unregister its net_device on .shutdown, DSA is |
1570 | * blocking that operation from completion, due to the dev_hold taken inside |
1571 | * netdev_upper_dev_link. Unlink the DSA user interfaces from being uppers of |
1572 | * the DSA conduit, so that the system can reboot successfully. |
1573 | */ |
1574 | void dsa_switch_shutdown(struct dsa_switch *ds) |
1575 | { |
1576 | struct net_device *conduit, *user_dev; |
1577 | struct dsa_port *dp; |
1578 | |
1579 | mutex_lock(&dsa2_mutex); |
1580 | |
1581 | if (!ds->setup) |
1582 | goto out; |
1583 | |
1584 | rtnl_lock(); |
1585 | |
1586 | dsa_switch_for_each_user_port(dp, ds) { |
1587 | conduit = dsa_port_to_conduit(dp); |
1588 | user_dev = dp->user; |
1589 | |
1590 | netdev_upper_dev_unlink(dev: conduit, upper_dev: user_dev); |
1591 | } |
1592 | |
1593 | /* Disconnect from further netdevice notifiers on the conduit, |
1594 | * since netdev_uses_dsa() will now return false. |
1595 | */ |
1596 | dsa_switch_for_each_cpu_port(dp, ds) |
1597 | dp->conduit->dsa_ptr = NULL; |
1598 | |
1599 | rtnl_unlock(); |
1600 | out: |
1601 | mutex_unlock(lock: &dsa2_mutex); |
1602 | } |
1603 | EXPORT_SYMBOL_GPL(dsa_switch_shutdown); |
1604 | |
1605 | #ifdef CONFIG_PM_SLEEP |
1606 | static bool dsa_port_is_initialized(const struct dsa_port *dp) |
1607 | { |
1608 | return dp->type == DSA_PORT_TYPE_USER && dp->user; |
1609 | } |
1610 | |
1611 | int dsa_switch_suspend(struct dsa_switch *ds) |
1612 | { |
1613 | struct dsa_port *dp; |
1614 | int ret = 0; |
1615 | |
1616 | /* Suspend user network devices */ |
1617 | dsa_switch_for_each_port(dp, ds) { |
1618 | if (!dsa_port_is_initialized(dp)) |
1619 | continue; |
1620 | |
1621 | ret = dsa_user_suspend(user_dev: dp->user); |
1622 | if (ret) |
1623 | return ret; |
1624 | } |
1625 | |
1626 | if (ds->ops->suspend) |
1627 | ret = ds->ops->suspend(ds); |
1628 | |
1629 | return ret; |
1630 | } |
1631 | EXPORT_SYMBOL_GPL(dsa_switch_suspend); |
1632 | |
1633 | int dsa_switch_resume(struct dsa_switch *ds) |
1634 | { |
1635 | struct dsa_port *dp; |
1636 | int ret = 0; |
1637 | |
1638 | if (ds->ops->resume) |
1639 | ret = ds->ops->resume(ds); |
1640 | |
1641 | if (ret) |
1642 | return ret; |
1643 | |
1644 | /* Resume user network devices */ |
1645 | dsa_switch_for_each_port(dp, ds) { |
1646 | if (!dsa_port_is_initialized(dp)) |
1647 | continue; |
1648 | |
1649 | ret = dsa_user_resume(user_dev: dp->user); |
1650 | if (ret) |
1651 | return ret; |
1652 | } |
1653 | |
1654 | return 0; |
1655 | } |
1656 | EXPORT_SYMBOL_GPL(dsa_switch_resume); |
1657 | #endif |
1658 | |
1659 | struct dsa_port *dsa_port_from_netdev(struct net_device *netdev) |
1660 | { |
1661 | if (!netdev || !dsa_user_dev_check(dev: netdev)) |
1662 | return ERR_PTR(error: -ENODEV); |
1663 | |
1664 | return dsa_user_to_port(dev: netdev); |
1665 | } |
1666 | EXPORT_SYMBOL_GPL(dsa_port_from_netdev); |
1667 | |
1668 | bool dsa_db_equal(const struct dsa_db *a, const struct dsa_db *b) |
1669 | { |
1670 | if (a->type != b->type) |
1671 | return false; |
1672 | |
1673 | switch (a->type) { |
1674 | case DSA_DB_PORT: |
1675 | return a->dp == b->dp; |
1676 | case DSA_DB_LAG: |
1677 | return a->lag.dev == b->lag.dev; |
1678 | case DSA_DB_BRIDGE: |
1679 | return a->bridge.num == b->bridge.num; |
1680 | default: |
1681 | WARN_ON(1); |
1682 | return false; |
1683 | } |
1684 | } |
1685 | |
1686 | bool dsa_fdb_present_in_other_db(struct dsa_switch *ds, int port, |
1687 | const unsigned char *addr, u16 vid, |
1688 | struct dsa_db db) |
1689 | { |
1690 | struct dsa_port *dp = dsa_to_port(ds, p: port); |
1691 | struct dsa_mac_addr *a; |
1692 | |
1693 | lockdep_assert_held(&dp->addr_lists_lock); |
1694 | |
1695 | list_for_each_entry(a, &dp->fdbs, list) { |
1696 | if (!ether_addr_equal(addr1: a->addr, addr2: addr) || a->vid != vid) |
1697 | continue; |
1698 | |
1699 | if (a->db.type == db.type && !dsa_db_equal(a: &a->db, b: &db)) |
1700 | return true; |
1701 | } |
1702 | |
1703 | return false; |
1704 | } |
1705 | EXPORT_SYMBOL_GPL(dsa_fdb_present_in_other_db); |
1706 | |
1707 | bool dsa_mdb_present_in_other_db(struct dsa_switch *ds, int port, |
1708 | const struct switchdev_obj_port_mdb *mdb, |
1709 | struct dsa_db db) |
1710 | { |
1711 | struct dsa_port *dp = dsa_to_port(ds, p: port); |
1712 | struct dsa_mac_addr *a; |
1713 | |
1714 | lockdep_assert_held(&dp->addr_lists_lock); |
1715 | |
1716 | list_for_each_entry(a, &dp->mdbs, list) { |
1717 | if (!ether_addr_equal(addr1: a->addr, addr2: mdb->addr) || a->vid != mdb->vid) |
1718 | continue; |
1719 | |
1720 | if (a->db.type == db.type && !dsa_db_equal(a: &a->db, b: &db)) |
1721 | return true; |
1722 | } |
1723 | |
1724 | return false; |
1725 | } |
1726 | EXPORT_SYMBOL_GPL(dsa_mdb_present_in_other_db); |
1727 | |
1728 | static const struct dsa_stubs __dsa_stubs = { |
1729 | .conduit_hwtstamp_validate = __dsa_conduit_hwtstamp_validate, |
1730 | }; |
1731 | |
1732 | static void dsa_register_stubs(void) |
1733 | { |
1734 | dsa_stubs = &__dsa_stubs; |
1735 | } |
1736 | |
1737 | static void dsa_unregister_stubs(void) |
1738 | { |
1739 | dsa_stubs = NULL; |
1740 | } |
1741 | |
1742 | static int __init dsa_init_module(void) |
1743 | { |
1744 | int rc; |
1745 | |
1746 | dsa_owq = alloc_ordered_workqueue("dsa_ordered" , |
1747 | WQ_MEM_RECLAIM); |
1748 | if (!dsa_owq) |
1749 | return -ENOMEM; |
1750 | |
1751 | rc = dsa_user_register_notifier(); |
1752 | if (rc) |
1753 | goto register_notifier_fail; |
1754 | |
1755 | dev_add_pack(pt: &dsa_pack_type); |
1756 | |
1757 | rc = rtnl_link_register(ops: &dsa_link_ops); |
1758 | if (rc) |
1759 | goto netlink_register_fail; |
1760 | |
1761 | dsa_register_stubs(); |
1762 | |
1763 | return 0; |
1764 | |
1765 | netlink_register_fail: |
1766 | dsa_user_unregister_notifier(); |
1767 | dev_remove_pack(pt: &dsa_pack_type); |
1768 | register_notifier_fail: |
1769 | destroy_workqueue(wq: dsa_owq); |
1770 | |
1771 | return rc; |
1772 | } |
1773 | module_init(dsa_init_module); |
1774 | |
1775 | static void __exit dsa_cleanup_module(void) |
1776 | { |
1777 | dsa_unregister_stubs(); |
1778 | |
1779 | rtnl_link_unregister(ops: &dsa_link_ops); |
1780 | |
1781 | dsa_user_unregister_notifier(); |
1782 | dev_remove_pack(pt: &dsa_pack_type); |
1783 | destroy_workqueue(wq: dsa_owq); |
1784 | } |
1785 | module_exit(dsa_cleanup_module); |
1786 | |
1787 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>" ); |
1788 | MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips" ); |
1789 | MODULE_LICENSE("GPL" ); |
1790 | MODULE_ALIAS("platform:dsa" ); |
1791 | |