xref: /openbmc/linux/net/dsa/port.c (revision e5bd61e8)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Handling of a single switch port
4  *
5  * Copyright (c) 2017 Savoir-faire Linux Inc.
6  *	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
7  */
8 
9 #include <linux/if_bridge.h>
10 #include <linux/notifier.h>
11 #include <linux/of_mdio.h>
12 #include <linux/of_net.h>
13 
14 #include "dsa_priv.h"
15 
16 /**
17  * dsa_port_notify - Notify the switching fabric of changes to a port
18  * @dp: port on which change occurred
19  * @e: event, must be of type DSA_NOTIFIER_*
20  * @v: event-specific value.
21  *
22  * Notify all switches in the DSA tree that this port's switch belongs to,
23  * including this switch itself, of an event. Allows the other switches to
24  * reconfigure themselves for cross-chip operations. Can also be used to
25  * reconfigure ports without net_devices (CPU ports, DSA links) whenever
26  * a user port's state changes.
27  */
28 static int dsa_port_notify(const struct dsa_port *dp, unsigned long e, void *v)
29 {
30 	return dsa_tree_notify(dp->ds->dst, e, v);
31 }
32 
33 int dsa_port_set_state(struct dsa_port *dp, u8 state)
34 {
35 	struct dsa_switch *ds = dp->ds;
36 	int port = dp->index;
37 
38 	if (!ds->ops->port_stp_state_set)
39 		return -EOPNOTSUPP;
40 
41 	ds->ops->port_stp_state_set(ds, port, state);
42 
43 	if (ds->ops->port_fast_age) {
44 		/* Fast age FDB entries or flush appropriate forwarding database
45 		 * for the given port, if we are moving it from Learning or
46 		 * Forwarding state, to Disabled or Blocking or Listening state.
47 		 */
48 
49 		if ((dp->stp_state == BR_STATE_LEARNING ||
50 		     dp->stp_state == BR_STATE_FORWARDING) &&
51 		    (state == BR_STATE_DISABLED ||
52 		     state == BR_STATE_BLOCKING ||
53 		     state == BR_STATE_LISTENING))
54 			ds->ops->port_fast_age(ds, port);
55 	}
56 
57 	dp->stp_state = state;
58 
59 	return 0;
60 }
61 
62 static void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
63 {
64 	int err;
65 
66 	err = dsa_port_set_state(dp, state);
67 	if (err)
68 		pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
69 }
70 
71 int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy)
72 {
73 	struct dsa_switch *ds = dp->ds;
74 	int port = dp->index;
75 	int err;
76 
77 	if (ds->ops->port_enable) {
78 		err = ds->ops->port_enable(ds, port, phy);
79 		if (err)
80 			return err;
81 	}
82 
83 	if (!dp->bridge_dev)
84 		dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
85 
86 	if (dp->pl)
87 		phylink_start(dp->pl);
88 
89 	return 0;
90 }
91 
92 int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
93 {
94 	int err;
95 
96 	rtnl_lock();
97 	err = dsa_port_enable_rt(dp, phy);
98 	rtnl_unlock();
99 
100 	return err;
101 }
102 
103 void dsa_port_disable_rt(struct dsa_port *dp)
104 {
105 	struct dsa_switch *ds = dp->ds;
106 	int port = dp->index;
107 
108 	if (dp->pl)
109 		phylink_stop(dp->pl);
110 
111 	if (!dp->bridge_dev)
112 		dsa_port_set_state_now(dp, BR_STATE_DISABLED);
113 
114 	if (ds->ops->port_disable)
115 		ds->ops->port_disable(ds, port);
116 }
117 
118 void dsa_port_disable(struct dsa_port *dp)
119 {
120 	rtnl_lock();
121 	dsa_port_disable_rt(dp);
122 	rtnl_unlock();
123 }
124 
125 static int dsa_port_inherit_brport_flags(struct dsa_port *dp,
126 					 struct netlink_ext_ack *extack)
127 {
128 	const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
129 				   BR_BCAST_FLOOD;
130 	struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
131 	int flag, err;
132 
133 	for_each_set_bit(flag, &mask, 32) {
134 		struct switchdev_brport_flags flags = {0};
135 
136 		flags.mask = BIT(flag);
137 
138 		if (br_port_flag_is_set(brport_dev, BIT(flag)))
139 			flags.val = BIT(flag);
140 
141 		err = dsa_port_bridge_flags(dp, flags, extack);
142 		if (err && err != -EOPNOTSUPP)
143 			return err;
144 	}
145 
146 	return 0;
147 }
148 
149 static void dsa_port_clear_brport_flags(struct dsa_port *dp)
150 {
151 	const unsigned long val = BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD;
152 	const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
153 				   BR_BCAST_FLOOD;
154 	int flag, err;
155 
156 	for_each_set_bit(flag, &mask, 32) {
157 		struct switchdev_brport_flags flags = {0};
158 
159 		flags.mask = BIT(flag);
160 		flags.val = val & BIT(flag);
161 
162 		err = dsa_port_bridge_flags(dp, flags, NULL);
163 		if (err && err != -EOPNOTSUPP)
164 			dev_err(dp->ds->dev,
165 				"failed to clear bridge port flag %lu: %pe\n",
166 				flags.val, ERR_PTR(err));
167 	}
168 }
169 
170 static int dsa_port_switchdev_sync(struct dsa_port *dp,
171 				   struct netlink_ext_ack *extack)
172 {
173 	struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
174 	struct net_device *br = dp->bridge_dev;
175 	int err;
176 
177 	err = dsa_port_inherit_brport_flags(dp, extack);
178 	if (err)
179 		return err;
180 
181 	err = dsa_port_set_state(dp, br_port_get_stp_state(brport_dev));
182 	if (err && err != -EOPNOTSUPP)
183 		return err;
184 
185 	err = dsa_port_vlan_filtering(dp, br_vlan_enabled(br), extack);
186 	if (err && err != -EOPNOTSUPP)
187 		return err;
188 
189 	err = dsa_port_mrouter(dp->cpu_dp, br_multicast_router(br), extack);
190 	if (err && err != -EOPNOTSUPP)
191 		return err;
192 
193 	err = dsa_port_ageing_time(dp, br_get_ageing_time(br));
194 	if (err && err != -EOPNOTSUPP)
195 		return err;
196 
197 	err = br_mdb_replay(br, brport_dev,
198 			    &dsa_slave_switchdev_blocking_notifier,
199 			    extack);
200 	if (err && err != -EOPNOTSUPP)
201 		return err;
202 
203 	err = br_fdb_replay(br, brport_dev, &dsa_slave_switchdev_notifier);
204 	if (err && err != -EOPNOTSUPP)
205 		return err;
206 
207 	err = br_vlan_replay(br, brport_dev,
208 			     &dsa_slave_switchdev_blocking_notifier,
209 			     extack);
210 	if (err && err != -EOPNOTSUPP)
211 		return err;
212 
213 	return 0;
214 }
215 
216 static void dsa_port_switchdev_unsync(struct dsa_port *dp)
217 {
218 	/* Configure the port for standalone mode (no address learning,
219 	 * flood everything).
220 	 * The bridge only emits SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS events
221 	 * when the user requests it through netlink or sysfs, but not
222 	 * automatically at port join or leave, so we need to handle resetting
223 	 * the brport flags ourselves. But we even prefer it that way, because
224 	 * otherwise, some setups might never get the notification they need,
225 	 * for example, when a port leaves a LAG that offloads the bridge,
226 	 * it becomes standalone, but as far as the bridge is concerned, no
227 	 * port ever left.
228 	 */
229 	dsa_port_clear_brport_flags(dp);
230 
231 	/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
232 	 * so allow it to be in BR_STATE_FORWARDING to be kept functional
233 	 */
234 	dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
235 
236 	/* VLAN filtering is handled by dsa_switch_bridge_leave */
237 
238 	/* Some drivers treat the notification for having a local multicast
239 	 * router by allowing multicast to be flooded to the CPU, so we should
240 	 * allow this in standalone mode too.
241 	 */
242 	dsa_port_mrouter(dp->cpu_dp, true, NULL);
243 
244 	/* Ageing time may be global to the switch chip, so don't change it
245 	 * here because we have no good reason (or value) to change it to.
246 	 */
247 }
248 
249 int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br,
250 			 struct netlink_ext_ack *extack)
251 {
252 	struct dsa_notifier_bridge_info info = {
253 		.tree_index = dp->ds->dst->index,
254 		.sw_index = dp->ds->index,
255 		.port = dp->index,
256 		.br = br,
257 	};
258 	int err;
259 
260 	/* Here the interface is already bridged. Reflect the current
261 	 * configuration so that drivers can program their chips accordingly.
262 	 */
263 	dp->bridge_dev = br;
264 
265 	err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_JOIN, &info);
266 	if (err)
267 		goto out_rollback;
268 
269 	err = dsa_port_switchdev_sync(dp, extack);
270 	if (err)
271 		goto out_rollback_unbridge;
272 
273 	return 0;
274 
275 out_rollback_unbridge:
276 	dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
277 out_rollback:
278 	dp->bridge_dev = NULL;
279 	return err;
280 }
281 
282 void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
283 {
284 	struct dsa_notifier_bridge_info info = {
285 		.tree_index = dp->ds->dst->index,
286 		.sw_index = dp->ds->index,
287 		.port = dp->index,
288 		.br = br,
289 	};
290 	int err;
291 
292 	/* Here the port is already unbridged. Reflect the current configuration
293 	 * so that drivers can program their chips accordingly.
294 	 */
295 	dp->bridge_dev = NULL;
296 
297 	err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
298 	if (err)
299 		pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
300 
301 	dsa_port_switchdev_unsync(dp);
302 }
303 
304 int dsa_port_lag_change(struct dsa_port *dp,
305 			struct netdev_lag_lower_state_info *linfo)
306 {
307 	struct dsa_notifier_lag_info info = {
308 		.sw_index = dp->ds->index,
309 		.port = dp->index,
310 	};
311 	bool tx_enabled;
312 
313 	if (!dp->lag_dev)
314 		return 0;
315 
316 	/* On statically configured aggregates (e.g. loadbalance
317 	 * without LACP) ports will always be tx_enabled, even if the
318 	 * link is down. Thus we require both link_up and tx_enabled
319 	 * in order to include it in the tx set.
320 	 */
321 	tx_enabled = linfo->link_up && linfo->tx_enabled;
322 
323 	if (tx_enabled == dp->lag_tx_enabled)
324 		return 0;
325 
326 	dp->lag_tx_enabled = tx_enabled;
327 
328 	return dsa_port_notify(dp, DSA_NOTIFIER_LAG_CHANGE, &info);
329 }
330 
331 int dsa_port_lag_join(struct dsa_port *dp, struct net_device *lag,
332 		      struct netdev_lag_upper_info *uinfo,
333 		      struct netlink_ext_ack *extack)
334 {
335 	struct dsa_notifier_lag_info info = {
336 		.sw_index = dp->ds->index,
337 		.port = dp->index,
338 		.lag = lag,
339 		.info = uinfo,
340 	};
341 	struct net_device *bridge_dev;
342 	int err;
343 
344 	dsa_lag_map(dp->ds->dst, lag);
345 	dp->lag_dev = lag;
346 
347 	err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_JOIN, &info);
348 	if (err)
349 		goto err_lag_join;
350 
351 	bridge_dev = netdev_master_upper_dev_get(lag);
352 	if (!bridge_dev || !netif_is_bridge_master(bridge_dev))
353 		return 0;
354 
355 	err = dsa_port_bridge_join(dp, bridge_dev, extack);
356 	if (err)
357 		goto err_bridge_join;
358 
359 	return 0;
360 
361 err_bridge_join:
362 	dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info);
363 err_lag_join:
364 	dp->lag_dev = NULL;
365 	dsa_lag_unmap(dp->ds->dst, lag);
366 	return err;
367 }
368 
369 void dsa_port_lag_leave(struct dsa_port *dp, struct net_device *lag)
370 {
371 	struct dsa_notifier_lag_info info = {
372 		.sw_index = dp->ds->index,
373 		.port = dp->index,
374 		.lag = lag,
375 	};
376 	int err;
377 
378 	if (!dp->lag_dev)
379 		return;
380 
381 	/* Port might have been part of a LAG that in turn was
382 	 * attached to a bridge.
383 	 */
384 	if (dp->bridge_dev)
385 		dsa_port_bridge_leave(dp, dp->bridge_dev);
386 
387 	dp->lag_tx_enabled = false;
388 	dp->lag_dev = NULL;
389 
390 	err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info);
391 	if (err)
392 		pr_err("DSA: failed to notify DSA_NOTIFIER_LAG_LEAVE: %d\n",
393 		       err);
394 
395 	dsa_lag_unmap(dp->ds->dst, lag);
396 }
397 
398 /* Must be called under rcu_read_lock() */
399 static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp,
400 					      bool vlan_filtering,
401 					      struct netlink_ext_ack *extack)
402 {
403 	struct dsa_switch *ds = dp->ds;
404 	int err, i;
405 
406 	/* VLAN awareness was off, so the question is "can we turn it on".
407 	 * We may have had 8021q uppers, those need to go. Make sure we don't
408 	 * enter an inconsistent state: deny changing the VLAN awareness state
409 	 * as long as we have 8021q uppers.
410 	 */
411 	if (vlan_filtering && dsa_is_user_port(ds, dp->index)) {
412 		struct net_device *upper_dev, *slave = dp->slave;
413 		struct net_device *br = dp->bridge_dev;
414 		struct list_head *iter;
415 
416 		netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
417 			struct bridge_vlan_info br_info;
418 			u16 vid;
419 
420 			if (!is_vlan_dev(upper_dev))
421 				continue;
422 
423 			vid = vlan_dev_vlan_id(upper_dev);
424 
425 			/* br_vlan_get_info() returns -EINVAL or -ENOENT if the
426 			 * device, respectively the VID is not found, returning
427 			 * 0 means success, which is a failure for us here.
428 			 */
429 			err = br_vlan_get_info(br, vid, &br_info);
430 			if (err == 0) {
431 				NL_SET_ERR_MSG_MOD(extack,
432 						   "Must first remove VLAN uppers having VIDs also present in bridge");
433 				return false;
434 			}
435 		}
436 	}
437 
438 	if (!ds->vlan_filtering_is_global)
439 		return true;
440 
441 	/* For cases where enabling/disabling VLAN awareness is global to the
442 	 * switch, we need to handle the case where multiple bridges span
443 	 * different ports of the same switch device and one of them has a
444 	 * different setting than what is being requested.
445 	 */
446 	for (i = 0; i < ds->num_ports; i++) {
447 		struct net_device *other_bridge;
448 
449 		other_bridge = dsa_to_port(ds, i)->bridge_dev;
450 		if (!other_bridge)
451 			continue;
452 		/* If it's the same bridge, it also has same
453 		 * vlan_filtering setting => no need to check
454 		 */
455 		if (other_bridge == dp->bridge_dev)
456 			continue;
457 		if (br_vlan_enabled(other_bridge) != vlan_filtering) {
458 			NL_SET_ERR_MSG_MOD(extack,
459 					   "VLAN filtering is a global setting");
460 			return false;
461 		}
462 	}
463 	return true;
464 }
465 
466 int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
467 			    struct netlink_ext_ack *extack)
468 {
469 	struct dsa_switch *ds = dp->ds;
470 	bool apply;
471 	int err;
472 
473 	if (!ds->ops->port_vlan_filtering)
474 		return -EOPNOTSUPP;
475 
476 	/* We are called from dsa_slave_switchdev_blocking_event(),
477 	 * which is not under rcu_read_lock(), unlike
478 	 * dsa_slave_switchdev_event().
479 	 */
480 	rcu_read_lock();
481 	apply = dsa_port_can_apply_vlan_filtering(dp, vlan_filtering, extack);
482 	rcu_read_unlock();
483 	if (!apply)
484 		return -EINVAL;
485 
486 	if (dsa_port_is_vlan_filtering(dp) == vlan_filtering)
487 		return 0;
488 
489 	err = ds->ops->port_vlan_filtering(ds, dp->index, vlan_filtering,
490 					   extack);
491 	if (err)
492 		return err;
493 
494 	if (ds->vlan_filtering_is_global)
495 		ds->vlan_filtering = vlan_filtering;
496 	else
497 		dp->vlan_filtering = vlan_filtering;
498 
499 	return 0;
500 }
501 
502 /* This enforces legacy behavior for switch drivers which assume they can't
503  * receive VLAN configuration when enslaved to a bridge with vlan_filtering=0
504  */
505 bool dsa_port_skip_vlan_configuration(struct dsa_port *dp)
506 {
507 	struct dsa_switch *ds = dp->ds;
508 
509 	if (!dp->bridge_dev)
510 		return false;
511 
512 	return (!ds->configure_vlan_while_not_filtering &&
513 		!br_vlan_enabled(dp->bridge_dev));
514 }
515 
516 int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock)
517 {
518 	unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
519 	unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
520 	struct dsa_notifier_ageing_time_info info;
521 	int err;
522 
523 	info.ageing_time = ageing_time;
524 
525 	err = dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
526 	if (err)
527 		return err;
528 
529 	dp->ageing_time = ageing_time;
530 
531 	return 0;
532 }
533 
534 int dsa_port_pre_bridge_flags(const struct dsa_port *dp,
535 			      struct switchdev_brport_flags flags,
536 			      struct netlink_ext_ack *extack)
537 {
538 	struct dsa_switch *ds = dp->ds;
539 
540 	if (!ds->ops->port_pre_bridge_flags)
541 		return -EINVAL;
542 
543 	return ds->ops->port_pre_bridge_flags(ds, dp->index, flags, extack);
544 }
545 
546 int dsa_port_bridge_flags(const struct dsa_port *dp,
547 			  struct switchdev_brport_flags flags,
548 			  struct netlink_ext_ack *extack)
549 {
550 	struct dsa_switch *ds = dp->ds;
551 
552 	if (!ds->ops->port_bridge_flags)
553 		return -EOPNOTSUPP;
554 
555 	return ds->ops->port_bridge_flags(ds, dp->index, flags, extack);
556 }
557 
558 int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
559 		     struct netlink_ext_ack *extack)
560 {
561 	struct dsa_switch *ds = dp->ds;
562 
563 	if (!ds->ops->port_set_mrouter)
564 		return -EOPNOTSUPP;
565 
566 	return ds->ops->port_set_mrouter(ds, dp->index, mrouter, extack);
567 }
568 
569 int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu,
570 			bool propagate_upstream)
571 {
572 	struct dsa_notifier_mtu_info info = {
573 		.sw_index = dp->ds->index,
574 		.propagate_upstream = propagate_upstream,
575 		.port = dp->index,
576 		.mtu = new_mtu,
577 	};
578 
579 	return dsa_port_notify(dp, DSA_NOTIFIER_MTU, &info);
580 }
581 
582 int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
583 		     u16 vid)
584 {
585 	struct dsa_notifier_fdb_info info = {
586 		.sw_index = dp->ds->index,
587 		.port = dp->index,
588 		.addr = addr,
589 		.vid = vid,
590 	};
591 
592 	return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info);
593 }
594 
595 int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
596 		     u16 vid)
597 {
598 	struct dsa_notifier_fdb_info info = {
599 		.sw_index = dp->ds->index,
600 		.port = dp->index,
601 		.addr = addr,
602 		.vid = vid,
603 
604 	};
605 
606 	return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info);
607 }
608 
609 int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data)
610 {
611 	struct dsa_switch *ds = dp->ds;
612 	int port = dp->index;
613 
614 	if (!ds->ops->port_fdb_dump)
615 		return -EOPNOTSUPP;
616 
617 	return ds->ops->port_fdb_dump(ds, port, cb, data);
618 }
619 
620 int dsa_port_mdb_add(const struct dsa_port *dp,
621 		     const struct switchdev_obj_port_mdb *mdb)
622 {
623 	struct dsa_notifier_mdb_info info = {
624 		.sw_index = dp->ds->index,
625 		.port = dp->index,
626 		.mdb = mdb,
627 	};
628 
629 	return dsa_port_notify(dp, DSA_NOTIFIER_MDB_ADD, &info);
630 }
631 
632 int dsa_port_mdb_del(const struct dsa_port *dp,
633 		     const struct switchdev_obj_port_mdb *mdb)
634 {
635 	struct dsa_notifier_mdb_info info = {
636 		.sw_index = dp->ds->index,
637 		.port = dp->index,
638 		.mdb = mdb,
639 	};
640 
641 	return dsa_port_notify(dp, DSA_NOTIFIER_MDB_DEL, &info);
642 }
643 
644 int dsa_port_vlan_add(struct dsa_port *dp,
645 		      const struct switchdev_obj_port_vlan *vlan,
646 		      struct netlink_ext_ack *extack)
647 {
648 	struct dsa_notifier_vlan_info info = {
649 		.sw_index = dp->ds->index,
650 		.port = dp->index,
651 		.vlan = vlan,
652 		.extack = extack,
653 	};
654 
655 	return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);
656 }
657 
658 int dsa_port_vlan_del(struct dsa_port *dp,
659 		      const struct switchdev_obj_port_vlan *vlan)
660 {
661 	struct dsa_notifier_vlan_info info = {
662 		.sw_index = dp->ds->index,
663 		.port = dp->index,
664 		.vlan = vlan,
665 	};
666 
667 	return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);
668 }
669 
670 int dsa_port_mrp_add(const struct dsa_port *dp,
671 		     const struct switchdev_obj_mrp *mrp)
672 {
673 	struct dsa_notifier_mrp_info info = {
674 		.sw_index = dp->ds->index,
675 		.port = dp->index,
676 		.mrp = mrp,
677 	};
678 
679 	return dsa_port_notify(dp, DSA_NOTIFIER_MRP_ADD, &info);
680 }
681 
682 int dsa_port_mrp_del(const struct dsa_port *dp,
683 		     const struct switchdev_obj_mrp *mrp)
684 {
685 	struct dsa_notifier_mrp_info info = {
686 		.sw_index = dp->ds->index,
687 		.port = dp->index,
688 		.mrp = mrp,
689 	};
690 
691 	return dsa_port_notify(dp, DSA_NOTIFIER_MRP_DEL, &info);
692 }
693 
694 int dsa_port_mrp_add_ring_role(const struct dsa_port *dp,
695 			       const struct switchdev_obj_ring_role_mrp *mrp)
696 {
697 	struct dsa_notifier_mrp_ring_role_info info = {
698 		.sw_index = dp->ds->index,
699 		.port = dp->index,
700 		.mrp = mrp,
701 	};
702 
703 	return dsa_port_notify(dp, DSA_NOTIFIER_MRP_ADD_RING_ROLE, &info);
704 }
705 
706 int dsa_port_mrp_del_ring_role(const struct dsa_port *dp,
707 			       const struct switchdev_obj_ring_role_mrp *mrp)
708 {
709 	struct dsa_notifier_mrp_ring_role_info info = {
710 		.sw_index = dp->ds->index,
711 		.port = dp->index,
712 		.mrp = mrp,
713 	};
714 
715 	return dsa_port_notify(dp, DSA_NOTIFIER_MRP_DEL_RING_ROLE, &info);
716 }
717 
718 void dsa_port_set_tag_protocol(struct dsa_port *cpu_dp,
719 			       const struct dsa_device_ops *tag_ops)
720 {
721 	cpu_dp->filter = tag_ops->filter;
722 	cpu_dp->rcv = tag_ops->rcv;
723 	cpu_dp->tag_ops = tag_ops;
724 }
725 
726 static struct phy_device *dsa_port_get_phy_device(struct dsa_port *dp)
727 {
728 	struct device_node *phy_dn;
729 	struct phy_device *phydev;
730 
731 	phy_dn = of_parse_phandle(dp->dn, "phy-handle", 0);
732 	if (!phy_dn)
733 		return NULL;
734 
735 	phydev = of_phy_find_device(phy_dn);
736 	if (!phydev) {
737 		of_node_put(phy_dn);
738 		return ERR_PTR(-EPROBE_DEFER);
739 	}
740 
741 	of_node_put(phy_dn);
742 	return phydev;
743 }
744 
745 static void dsa_port_phylink_validate(struct phylink_config *config,
746 				      unsigned long *supported,
747 				      struct phylink_link_state *state)
748 {
749 	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
750 	struct dsa_switch *ds = dp->ds;
751 
752 	if (!ds->ops->phylink_validate)
753 		return;
754 
755 	ds->ops->phylink_validate(ds, dp->index, supported, state);
756 }
757 
758 static void dsa_port_phylink_mac_pcs_get_state(struct phylink_config *config,
759 					       struct phylink_link_state *state)
760 {
761 	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
762 	struct dsa_switch *ds = dp->ds;
763 	int err;
764 
765 	/* Only called for inband modes */
766 	if (!ds->ops->phylink_mac_link_state) {
767 		state->link = 0;
768 		return;
769 	}
770 
771 	err = ds->ops->phylink_mac_link_state(ds, dp->index, state);
772 	if (err < 0) {
773 		dev_err(ds->dev, "p%d: phylink_mac_link_state() failed: %d\n",
774 			dp->index, err);
775 		state->link = 0;
776 	}
777 }
778 
779 static void dsa_port_phylink_mac_config(struct phylink_config *config,
780 					unsigned int mode,
781 					const struct phylink_link_state *state)
782 {
783 	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
784 	struct dsa_switch *ds = dp->ds;
785 
786 	if (!ds->ops->phylink_mac_config)
787 		return;
788 
789 	ds->ops->phylink_mac_config(ds, dp->index, mode, state);
790 }
791 
792 static void dsa_port_phylink_mac_an_restart(struct phylink_config *config)
793 {
794 	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
795 	struct dsa_switch *ds = dp->ds;
796 
797 	if (!ds->ops->phylink_mac_an_restart)
798 		return;
799 
800 	ds->ops->phylink_mac_an_restart(ds, dp->index);
801 }
802 
803 static void dsa_port_phylink_mac_link_down(struct phylink_config *config,
804 					   unsigned int mode,
805 					   phy_interface_t interface)
806 {
807 	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
808 	struct phy_device *phydev = NULL;
809 	struct dsa_switch *ds = dp->ds;
810 
811 	if (dsa_is_user_port(ds, dp->index))
812 		phydev = dp->slave->phydev;
813 
814 	if (!ds->ops->phylink_mac_link_down) {
815 		if (ds->ops->adjust_link && phydev)
816 			ds->ops->adjust_link(ds, dp->index, phydev);
817 		return;
818 	}
819 
820 	ds->ops->phylink_mac_link_down(ds, dp->index, mode, interface);
821 }
822 
823 static void dsa_port_phylink_mac_link_up(struct phylink_config *config,
824 					 struct phy_device *phydev,
825 					 unsigned int mode,
826 					 phy_interface_t interface,
827 					 int speed, int duplex,
828 					 bool tx_pause, bool rx_pause)
829 {
830 	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
831 	struct dsa_switch *ds = dp->ds;
832 
833 	if (!ds->ops->phylink_mac_link_up) {
834 		if (ds->ops->adjust_link && phydev)
835 			ds->ops->adjust_link(ds, dp->index, phydev);
836 		return;
837 	}
838 
839 	ds->ops->phylink_mac_link_up(ds, dp->index, mode, interface, phydev,
840 				     speed, duplex, tx_pause, rx_pause);
841 }
842 
843 const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
844 	.validate = dsa_port_phylink_validate,
845 	.mac_pcs_get_state = dsa_port_phylink_mac_pcs_get_state,
846 	.mac_config = dsa_port_phylink_mac_config,
847 	.mac_an_restart = dsa_port_phylink_mac_an_restart,
848 	.mac_link_down = dsa_port_phylink_mac_link_down,
849 	.mac_link_up = dsa_port_phylink_mac_link_up,
850 };
851 
852 static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
853 {
854 	struct dsa_switch *ds = dp->ds;
855 	struct phy_device *phydev;
856 	int port = dp->index;
857 	int err = 0;
858 
859 	phydev = dsa_port_get_phy_device(dp);
860 	if (!phydev)
861 		return 0;
862 
863 	if (IS_ERR(phydev))
864 		return PTR_ERR(phydev);
865 
866 	if (enable) {
867 		err = genphy_resume(phydev);
868 		if (err < 0)
869 			goto err_put_dev;
870 
871 		err = genphy_read_status(phydev);
872 		if (err < 0)
873 			goto err_put_dev;
874 	} else {
875 		err = genphy_suspend(phydev);
876 		if (err < 0)
877 			goto err_put_dev;
878 	}
879 
880 	if (ds->ops->adjust_link)
881 		ds->ops->adjust_link(ds, port, phydev);
882 
883 	dev_dbg(ds->dev, "enabled port's phy: %s", phydev_name(phydev));
884 
885 err_put_dev:
886 	put_device(&phydev->mdio.dev);
887 	return err;
888 }
889 
890 static int dsa_port_fixed_link_register_of(struct dsa_port *dp)
891 {
892 	struct device_node *dn = dp->dn;
893 	struct dsa_switch *ds = dp->ds;
894 	struct phy_device *phydev;
895 	int port = dp->index;
896 	phy_interface_t mode;
897 	int err;
898 
899 	err = of_phy_register_fixed_link(dn);
900 	if (err) {
901 		dev_err(ds->dev,
902 			"failed to register the fixed PHY of port %d\n",
903 			port);
904 		return err;
905 	}
906 
907 	phydev = of_phy_find_device(dn);
908 
909 	err = of_get_phy_mode(dn, &mode);
910 	if (err)
911 		mode = PHY_INTERFACE_MODE_NA;
912 	phydev->interface = mode;
913 
914 	genphy_read_status(phydev);
915 
916 	if (ds->ops->adjust_link)
917 		ds->ops->adjust_link(ds, port, phydev);
918 
919 	put_device(&phydev->mdio.dev);
920 
921 	return 0;
922 }
923 
924 static int dsa_port_phylink_register(struct dsa_port *dp)
925 {
926 	struct dsa_switch *ds = dp->ds;
927 	struct device_node *port_dn = dp->dn;
928 	phy_interface_t mode;
929 	int err;
930 
931 	err = of_get_phy_mode(port_dn, &mode);
932 	if (err)
933 		mode = PHY_INTERFACE_MODE_NA;
934 
935 	dp->pl_config.dev = ds->dev;
936 	dp->pl_config.type = PHYLINK_DEV;
937 	dp->pl_config.pcs_poll = ds->pcs_poll;
938 
939 	dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn),
940 				mode, &dsa_port_phylink_mac_ops);
941 	if (IS_ERR(dp->pl)) {
942 		pr_err("error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
943 		return PTR_ERR(dp->pl);
944 	}
945 
946 	err = phylink_of_phy_connect(dp->pl, port_dn, 0);
947 	if (err && err != -ENODEV) {
948 		pr_err("could not attach to PHY: %d\n", err);
949 		goto err_phy_connect;
950 	}
951 
952 	return 0;
953 
954 err_phy_connect:
955 	phylink_destroy(dp->pl);
956 	return err;
957 }
958 
959 int dsa_port_link_register_of(struct dsa_port *dp)
960 {
961 	struct dsa_switch *ds = dp->ds;
962 	struct device_node *phy_np;
963 	int port = dp->index;
964 
965 	if (!ds->ops->adjust_link) {
966 		phy_np = of_parse_phandle(dp->dn, "phy-handle", 0);
967 		if (of_phy_is_fixed_link(dp->dn) || phy_np) {
968 			if (ds->ops->phylink_mac_link_down)
969 				ds->ops->phylink_mac_link_down(ds, port,
970 					MLO_AN_FIXED, PHY_INTERFACE_MODE_NA);
971 			return dsa_port_phylink_register(dp);
972 		}
973 		return 0;
974 	}
975 
976 	dev_warn(ds->dev,
977 		 "Using legacy PHYLIB callbacks. Please migrate to PHYLINK!\n");
978 
979 	if (of_phy_is_fixed_link(dp->dn))
980 		return dsa_port_fixed_link_register_of(dp);
981 	else
982 		return dsa_port_setup_phy_of(dp, true);
983 }
984 
985 void dsa_port_link_unregister_of(struct dsa_port *dp)
986 {
987 	struct dsa_switch *ds = dp->ds;
988 
989 	if (!ds->ops->adjust_link && dp->pl) {
990 		rtnl_lock();
991 		phylink_disconnect_phy(dp->pl);
992 		rtnl_unlock();
993 		phylink_destroy(dp->pl);
994 		dp->pl = NULL;
995 		return;
996 	}
997 
998 	if (of_phy_is_fixed_link(dp->dn))
999 		of_phy_deregister_fixed_link(dp->dn);
1000 	else
1001 		dsa_port_setup_phy_of(dp, false);
1002 }
1003 
1004 int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data)
1005 {
1006 	struct phy_device *phydev;
1007 	int ret = -EOPNOTSUPP;
1008 
1009 	if (of_phy_is_fixed_link(dp->dn))
1010 		return ret;
1011 
1012 	phydev = dsa_port_get_phy_device(dp);
1013 	if (IS_ERR_OR_NULL(phydev))
1014 		return ret;
1015 
1016 	ret = phy_ethtool_get_strings(phydev, data);
1017 	put_device(&phydev->mdio.dev);
1018 
1019 	return ret;
1020 }
1021 EXPORT_SYMBOL_GPL(dsa_port_get_phy_strings);
1022 
1023 int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data)
1024 {
1025 	struct phy_device *phydev;
1026 	int ret = -EOPNOTSUPP;
1027 
1028 	if (of_phy_is_fixed_link(dp->dn))
1029 		return ret;
1030 
1031 	phydev = dsa_port_get_phy_device(dp);
1032 	if (IS_ERR_OR_NULL(phydev))
1033 		return ret;
1034 
1035 	ret = phy_ethtool_get_stats(phydev, NULL, data);
1036 	put_device(&phydev->mdio.dev);
1037 
1038 	return ret;
1039 }
1040 EXPORT_SYMBOL_GPL(dsa_port_get_ethtool_phy_stats);
1041 
1042 int dsa_port_get_phy_sset_count(struct dsa_port *dp)
1043 {
1044 	struct phy_device *phydev;
1045 	int ret = -EOPNOTSUPP;
1046 
1047 	if (of_phy_is_fixed_link(dp->dn))
1048 		return ret;
1049 
1050 	phydev = dsa_port_get_phy_device(dp);
1051 	if (IS_ERR_OR_NULL(phydev))
1052 		return ret;
1053 
1054 	ret = phy_ethtool_get_sset_count(phydev);
1055 	put_device(&phydev->mdio.dev);
1056 
1057 	return ret;
1058 }
1059 EXPORT_SYMBOL_GPL(dsa_port_get_phy_sset_count);
1060 
1061 int dsa_port_hsr_join(struct dsa_port *dp, struct net_device *hsr)
1062 {
1063 	struct dsa_notifier_hsr_info info = {
1064 		.sw_index = dp->ds->index,
1065 		.port = dp->index,
1066 		.hsr = hsr,
1067 	};
1068 	int err;
1069 
1070 	dp->hsr_dev = hsr;
1071 
1072 	err = dsa_port_notify(dp, DSA_NOTIFIER_HSR_JOIN, &info);
1073 	if (err)
1074 		dp->hsr_dev = NULL;
1075 
1076 	return err;
1077 }
1078 
1079 void dsa_port_hsr_leave(struct dsa_port *dp, struct net_device *hsr)
1080 {
1081 	struct dsa_notifier_hsr_info info = {
1082 		.sw_index = dp->ds->index,
1083 		.port = dp->index,
1084 		.hsr = hsr,
1085 	};
1086 	int err;
1087 
1088 	dp->hsr_dev = NULL;
1089 
1090 	err = dsa_port_notify(dp, DSA_NOTIFIER_HSR_LEAVE, &info);
1091 	if (err)
1092 		pr_err("DSA: failed to notify DSA_NOTIFIER_HSR_LEAVE\n");
1093 }
1094