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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
16static int dsa_port_notify(const struct dsa_port *dp, unsigned long e, void *v)
17{
18 struct raw_notifier_head *nh = &dp->ds->dst->nh;
19 int err;
20
21 err = raw_notifier_call_chain(nh, e, v);
22
23 return notifier_to_errno(err);
24}
25
26int dsa_port_set_state(struct dsa_port *dp, u8 state,
27 struct switchdev_trans *trans)
28{
29 struct dsa_switch *ds = dp->ds;
30 int port = dp->index;
31
32 if (switchdev_trans_ph_prepare(trans))
33 return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;
34
35 if (ds->ops->port_stp_state_set)
36 ds->ops->port_stp_state_set(ds, port, state);
37
38 if (ds->ops->port_fast_age) {
39 /* Fast age FDB entries or flush appropriate forwarding database
40 * for the given port, if we are moving it from Learning or
41 * Forwarding state, to Disabled or Blocking or Listening state.
42 */
43
44 if ((dp->stp_state == BR_STATE_LEARNING ||
45 dp->stp_state == BR_STATE_FORWARDING) &&
46 (state == BR_STATE_DISABLED ||
47 state == BR_STATE_BLOCKING ||
48 state == BR_STATE_LISTENING))
49 ds->ops->port_fast_age(ds, port);
50 }
51
52 dp->stp_state = state;
53
54 return 0;
55}
56
57static void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
58{
59 int err;
60
61 err = dsa_port_set_state(dp, state, NULL);
62 if (err)
63 pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
64}
65
66int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
67{
68 struct dsa_switch *ds = dp->ds;
69 int port = dp->index;
70 int err;
71
72 if (ds->ops->port_enable) {
73 err = ds->ops->port_enable(ds, port, phy);
74 if (err)
75 return err;
76 }
77
78 if (!dp->bridge_dev)
79 dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
80
81 return 0;
82}
83
84void dsa_port_disable(struct dsa_port *dp)
85{
86 struct dsa_switch *ds = dp->ds;
87 int port = dp->index;
88
89 if (!dp->bridge_dev)
90 dsa_port_set_state_now(dp, BR_STATE_DISABLED);
91
92 if (ds->ops->port_disable)
93 ds->ops->port_disable(ds, port);
94}
95
96int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br)
97{
98 struct dsa_notifier_bridge_info info = {
99 .sw_index = dp->ds->index,
100 .port = dp->index,
101 .br = br,
102 };
103 int err;
104
105 /* Set the flooding mode before joining the port in the switch */
106 err = dsa_port_bridge_flags(dp, BR_FLOOD | BR_MCAST_FLOOD, NULL);
107 if (err)
108 return err;
109
110 /* Here the interface is already bridged. Reflect the current
111 * configuration so that drivers can program their chips accordingly.
112 */
113 dp->bridge_dev = br;
114
115 err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info);
116
117 /* The bridging is rolled back on error */
118 if (err) {
119 dsa_port_bridge_flags(dp, 0, NULL);
120 dp->bridge_dev = NULL;
121 }
122
123 return err;
124}
125
126void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
127{
128 struct dsa_notifier_bridge_info info = {
129 .sw_index = dp->ds->index,
130 .port = dp->index,
131 .br = br,
132 };
133 int err;
134
135 /* Here the port is already unbridged. Reflect the current configuration
136 * so that drivers can program their chips accordingly.
137 */
138 dp->bridge_dev = NULL;
139
140 err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info);
141 if (err)
142 pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
143
144 /* Port is leaving the bridge, disable flooding */
145 dsa_port_bridge_flags(dp, 0, NULL);
146
147 /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
148 * so allow it to be in BR_STATE_FORWARDING to be kept functional
149 */
150 dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
151}
152
153static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp,
154 bool vlan_filtering)
155{
156 struct dsa_switch *ds = dp->ds;
157 int i;
158
159 if (!ds->vlan_filtering_is_global)
160 return true;
161
162 /* For cases where enabling/disabling VLAN awareness is global to the
163 * switch, we need to handle the case where multiple bridges span
164 * different ports of the same switch device and one of them has a
165 * different setting than what is being requested.
166 */
167 for (i = 0; i < ds->num_ports; i++) {
168 struct net_device *other_bridge;
169
170 other_bridge = dsa_to_port(ds, i)->bridge_dev;
171 if (!other_bridge)
172 continue;
173 /* If it's the same bridge, it also has same
174 * vlan_filtering setting => no need to check
175 */
176 if (other_bridge == dp->bridge_dev)
177 continue;
178 if (br_vlan_enabled(other_bridge) != vlan_filtering) {
179 dev_err(ds->dev, "VLAN filtering is a global setting\n");
180 return false;
181 }
182 }
183 return true;
184}
185
186int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
187 struct switchdev_trans *trans)
188{
189 struct dsa_switch *ds = dp->ds;
190 int err;
191
192 /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
193 if (switchdev_trans_ph_prepare(trans))
194 return 0;
195
196 if (!ds->ops->port_vlan_filtering)
197 return 0;
198
199 if (!dsa_port_can_apply_vlan_filtering(dp, vlan_filtering))
200 return -EINVAL;
201
202 if (dsa_port_is_vlan_filtering(dp) == vlan_filtering)
203 return 0;
204
205 err = ds->ops->port_vlan_filtering(ds, dp->index,
206 vlan_filtering);
207 if (err)
208 return err;
209
210 if (ds->vlan_filtering_is_global)
211 ds->vlan_filtering = vlan_filtering;
212 else
213 dp->vlan_filtering = vlan_filtering;
214 return 0;
215}
216
217int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
218 struct switchdev_trans *trans)
219{
220 unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
221 unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
222 struct dsa_notifier_ageing_time_info info = {
223 .ageing_time = ageing_time,
224 .trans = trans,
225 };
226
227 if (switchdev_trans_ph_prepare(trans))
228 return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
229
230 dp->ageing_time = ageing_time;
231
232 return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
233}
234
235int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags,
236 struct switchdev_trans *trans)
237{
238 struct dsa_switch *ds = dp->ds;
239
240 if (!ds->ops->port_egress_floods ||
241 (flags & ~(BR_FLOOD | BR_MCAST_FLOOD)))
242 return -EINVAL;
243
244 return 0;
245}
246
247int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
248 struct switchdev_trans *trans)
249{
250 struct dsa_switch *ds = dp->ds;
251 int port = dp->index;
252 int err = 0;
253
254 if (switchdev_trans_ph_prepare(trans))
255 return 0;
256
257 if (ds->ops->port_egress_floods)
258 err = ds->ops->port_egress_floods(ds, port, flags & BR_FLOOD,
259 flags & BR_MCAST_FLOOD);
260
261 return err;
262}
263
264int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
265 struct switchdev_trans *trans)
266{
267 struct dsa_switch *ds = dp->ds;
268 int port = dp->index;
269
270 if (switchdev_trans_ph_prepare(trans))
271 return ds->ops->port_egress_floods ? 0 : -EOPNOTSUPP;
272
273 return ds->ops->port_egress_floods(ds, port, true, mrouter);
274}
275
276int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
277 u16 vid)
278{
279 struct dsa_notifier_fdb_info info = {
280 .sw_index = dp->ds->index,
281 .port = dp->index,
282 .addr = addr,
283 .vid = vid,
284 };
285
286 return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info);
287}
288
289int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
290 u16 vid)
291{
292 struct dsa_notifier_fdb_info info = {
293 .sw_index = dp->ds->index,
294 .port = dp->index,
295 .addr = addr,
296 .vid = vid,
297
298 };
299
300 return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info);
301}
302
303int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data)
304{
305 struct dsa_switch *ds = dp->ds;
306 int port = dp->index;
307
308 if (!ds->ops->port_fdb_dump)
309 return -EOPNOTSUPP;
310
311 return ds->ops->port_fdb_dump(ds, port, cb, data);
312}
313
314int dsa_port_mdb_add(const struct dsa_port *dp,
315 const struct switchdev_obj_port_mdb *mdb,
316 struct switchdev_trans *trans)
317{
318 struct dsa_notifier_mdb_info info = {
319 .sw_index = dp->ds->index,
320 .port = dp->index,
321 .trans = trans,
322 .mdb = mdb,
323 };
324
325 return dsa_port_notify(dp, DSA_NOTIFIER_MDB_ADD, &info);
326}
327
328int dsa_port_mdb_del(const struct dsa_port *dp,
329 const struct switchdev_obj_port_mdb *mdb)
330{
331 struct dsa_notifier_mdb_info info = {
332 .sw_index = dp->ds->index,
333 .port = dp->index,
334 .mdb = mdb,
335 };
336
337 return dsa_port_notify(dp, DSA_NOTIFIER_MDB_DEL, &info);
338}
339
340int dsa_port_vlan_add(struct dsa_port *dp,
341 const struct switchdev_obj_port_vlan *vlan,
342 struct switchdev_trans *trans)
343{
344 struct dsa_notifier_vlan_info info = {
345 .sw_index = dp->ds->index,
346 .port = dp->index,
347 .trans = trans,
348 .vlan = vlan,
349 };
350
351 return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);
352}
353
354int dsa_port_vlan_del(struct dsa_port *dp,
355 const struct switchdev_obj_port_vlan *vlan)
356{
357 struct dsa_notifier_vlan_info info = {
358 .sw_index = dp->ds->index,
359 .port = dp->index,
360 .vlan = vlan,
361 };
362
363 return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);
364}
365
366int dsa_port_vid_add(struct dsa_port *dp, u16 vid, u16 flags)
367{
368 struct switchdev_obj_port_vlan vlan = {
369 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
370 .flags = flags,
371 .vid_begin = vid,
372 .vid_end = vid,
373 };
374 struct switchdev_trans trans;
375 int err;
376
377 trans.ph_prepare = true;
378 err = dsa_port_vlan_add(dp, &vlan, &trans);
379 if (err)
380 return err;
381
382 trans.ph_prepare = false;
383 return dsa_port_vlan_add(dp, &vlan, &trans);
384}
385EXPORT_SYMBOL(dsa_port_vid_add);
386
387int dsa_port_vid_del(struct dsa_port *dp, u16 vid)
388{
389 struct switchdev_obj_port_vlan vlan = {
390 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
391 .vid_begin = vid,
392 .vid_end = vid,
393 };
394
395 return dsa_port_vlan_del(dp, &vlan);
396}
397EXPORT_SYMBOL(dsa_port_vid_del);
398
399static struct phy_device *dsa_port_get_phy_device(struct dsa_port *dp)
400{
401 struct device_node *phy_dn;
402 struct phy_device *phydev;
403
404 phy_dn = of_parse_phandle(dp->dn, "phy-handle", 0);
405 if (!phy_dn)
406 return NULL;
407
408 phydev = of_phy_find_device(phy_dn);
409 if (!phydev) {
410 of_node_put(phy_dn);
411 return ERR_PTR(-EPROBE_DEFER);
412 }
413
414 of_node_put(phy_dn);
415 return phydev;
416}
417
418void dsa_port_phylink_validate(struct phylink_config *config,
419 unsigned long *supported,
420 struct phylink_link_state *state)
421{
422 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
423 struct dsa_switch *ds = dp->ds;
424
425 if (!ds->ops->phylink_validate)
426 return;
427
428 ds->ops->phylink_validate(ds, dp->index, supported, state);
429}
430EXPORT_SYMBOL_GPL(dsa_port_phylink_validate);
431
432int dsa_port_phylink_mac_link_state(struct phylink_config *config,
433 struct phylink_link_state *state)
434{
435 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
436 struct dsa_switch *ds = dp->ds;
437
438 /* Only called for SGMII and 802.3z */
439 if (!ds->ops->phylink_mac_link_state)
440 return -EOPNOTSUPP;
441
442 return ds->ops->phylink_mac_link_state(ds, dp->index, state);
443}
444EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_link_state);
445
446void dsa_port_phylink_mac_config(struct phylink_config *config,
447 unsigned int mode,
448 const struct phylink_link_state *state)
449{
450 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
451 struct dsa_switch *ds = dp->ds;
452
453 if (!ds->ops->phylink_mac_config)
454 return;
455
456 ds->ops->phylink_mac_config(ds, dp->index, mode, state);
457}
458EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_config);
459
460void dsa_port_phylink_mac_an_restart(struct phylink_config *config)
461{
462 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
463 struct dsa_switch *ds = dp->ds;
464
465 if (!ds->ops->phylink_mac_an_restart)
466 return;
467
468 ds->ops->phylink_mac_an_restart(ds, dp->index);
469}
470EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_an_restart);
471
472void dsa_port_phylink_mac_link_down(struct phylink_config *config,
473 unsigned int mode,
474 phy_interface_t interface)
475{
476 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
477 struct phy_device *phydev = NULL;
478 struct dsa_switch *ds = dp->ds;
479
480 if (dsa_is_user_port(ds, dp->index))
481 phydev = dp->slave->phydev;
482
483 if (!ds->ops->phylink_mac_link_down) {
484 if (ds->ops->adjust_link && phydev)
485 ds->ops->adjust_link(ds, dp->index, phydev);
486 return;
487 }
488
489 ds->ops->phylink_mac_link_down(ds, dp->index, mode, interface);
490}
491EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_link_down);
492
493void dsa_port_phylink_mac_link_up(struct phylink_config *config,
494 unsigned int mode,
495 phy_interface_t interface,
496 struct phy_device *phydev)
497{
498 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
499 struct dsa_switch *ds = dp->ds;
500
501 if (!ds->ops->phylink_mac_link_up) {
502 if (ds->ops->adjust_link && phydev)
503 ds->ops->adjust_link(ds, dp->index, phydev);
504 return;
505 }
506
507 ds->ops->phylink_mac_link_up(ds, dp->index, mode, interface, phydev);
508}
509EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_link_up);
510
511const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
512 .validate = dsa_port_phylink_validate,
513 .mac_link_state = dsa_port_phylink_mac_link_state,
514 .mac_config = dsa_port_phylink_mac_config,
515 .mac_an_restart = dsa_port_phylink_mac_an_restart,
516 .mac_link_down = dsa_port_phylink_mac_link_down,
517 .mac_link_up = dsa_port_phylink_mac_link_up,
518};
519
520static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
521{
522 struct dsa_switch *ds = dp->ds;
523 struct phy_device *phydev;
524 int port = dp->index;
525 int err = 0;
526
527 phydev = dsa_port_get_phy_device(dp);
528 if (!phydev)
529 return 0;
530
531 if (IS_ERR(phydev))
532 return PTR_ERR(phydev);
533
534 if (enable) {
535 err = genphy_resume(phydev);
536 if (err < 0)
537 goto err_put_dev;
538
539 err = genphy_read_status(phydev);
540 if (err < 0)
541 goto err_put_dev;
542 } else {
543 err = genphy_suspend(phydev);
544 if (err < 0)
545 goto err_put_dev;
546 }
547
548 if (ds->ops->adjust_link)
549 ds->ops->adjust_link(ds, port, phydev);
550
551 dev_dbg(ds->dev, "enabled port's phy: %s", phydev_name(phydev));
552
553err_put_dev:
554 put_device(&phydev->mdio.dev);
555 return err;
556}
557
558static int dsa_port_fixed_link_register_of(struct dsa_port *dp)
559{
560 struct device_node *dn = dp->dn;
561 struct dsa_switch *ds = dp->ds;
562 struct phy_device *phydev;
563 int port = dp->index;
564 int mode;
565 int err;
566
567 err = of_phy_register_fixed_link(dn);
568 if (err) {
569 dev_err(ds->dev,
570 "failed to register the fixed PHY of port %d\n",
571 port);
572 return err;
573 }
574
575 phydev = of_phy_find_device(dn);
576
577 mode = of_get_phy_mode(dn);
578 if (mode < 0)
579 mode = PHY_INTERFACE_MODE_NA;
580 phydev->interface = mode;
581
582 genphy_read_status(phydev);
583
584 if (ds->ops->adjust_link)
585 ds->ops->adjust_link(ds, port, phydev);
586
587 put_device(&phydev->mdio.dev);
588
589 return 0;
590}
591
592static int dsa_port_phylink_register(struct dsa_port *dp)
593{
594 struct dsa_switch *ds = dp->ds;
595 struct device_node *port_dn = dp->dn;
596 int mode, err;
597
598 mode = of_get_phy_mode(port_dn);
599 if (mode < 0)
600 mode = PHY_INTERFACE_MODE_NA;
601
602 dp->pl_config.dev = ds->dev;
603 dp->pl_config.type = PHYLINK_DEV;
604
605 dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn),
606 mode, &dsa_port_phylink_mac_ops);
607 if (IS_ERR(dp->pl)) {
608 pr_err("error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
609 return PTR_ERR(dp->pl);
610 }
611
612 err = phylink_of_phy_connect(dp->pl, port_dn, 0);
613 if (err && err != -ENODEV) {
614 pr_err("could not attach to PHY: %d\n", err);
615 goto err_phy_connect;
616 }
617
618 rtnl_lock();
619 phylink_start(dp->pl);
620 rtnl_unlock();
621
622 return 0;
623
624err_phy_connect:
625 phylink_destroy(dp->pl);
626 return err;
627}
628
629int dsa_port_link_register_of(struct dsa_port *dp)
630{
631 struct dsa_switch *ds = dp->ds;
632
633 if (!ds->ops->adjust_link)
634 return dsa_port_phylink_register(dp);
635
636 dev_warn(ds->dev,
637 "Using legacy PHYLIB callbacks. Please migrate to PHYLINK!\n");
638
639 if (of_phy_is_fixed_link(dp->dn))
640 return dsa_port_fixed_link_register_of(dp);
641 else
642 return dsa_port_setup_phy_of(dp, true);
643}
644
645void dsa_port_link_unregister_of(struct dsa_port *dp)
646{
647 struct dsa_switch *ds = dp->ds;
648
649 if (!ds->ops->adjust_link) {
650 rtnl_lock();
651 phylink_disconnect_phy(dp->pl);
652 rtnl_unlock();
653 phylink_destroy(dp->pl);
654 return;
655 }
656
657 if (of_phy_is_fixed_link(dp->dn))
658 of_phy_deregister_fixed_link(dp->dn);
659 else
660 dsa_port_setup_phy_of(dp, false);
661}
662
663int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data)
664{
665 struct phy_device *phydev;
666 int ret = -EOPNOTSUPP;
667
668 if (of_phy_is_fixed_link(dp->dn))
669 return ret;
670
671 phydev = dsa_port_get_phy_device(dp);
672 if (IS_ERR_OR_NULL(phydev))
673 return ret;
674
675 ret = phy_ethtool_get_strings(phydev, data);
676 put_device(&phydev->mdio.dev);
677
678 return ret;
679}
680EXPORT_SYMBOL_GPL(dsa_port_get_phy_strings);
681
682int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data)
683{
684 struct phy_device *phydev;
685 int ret = -EOPNOTSUPP;
686
687 if (of_phy_is_fixed_link(dp->dn))
688 return ret;
689
690 phydev = dsa_port_get_phy_device(dp);
691 if (IS_ERR_OR_NULL(phydev))
692 return ret;
693
694 ret = phy_ethtool_get_stats(phydev, NULL, data);
695 put_device(&phydev->mdio.dev);
696
697 return ret;
698}
699EXPORT_SYMBOL_GPL(dsa_port_get_ethtool_phy_stats);
700
701int dsa_port_get_phy_sset_count(struct dsa_port *dp)
702{
703 struct phy_device *phydev;
704 int ret = -EOPNOTSUPP;
705
706 if (of_phy_is_fixed_link(dp->dn))
707 return ret;
708
709 phydev = dsa_port_get_phy_device(dp);
710 if (IS_ERR_OR_NULL(phydev))
711 return ret;
712
713 ret = phy_ethtool_get_sset_count(phydev);
714 put_device(&phydev->mdio.dev);
715
716 return ret;
717}
718EXPORT_SYMBOL_GPL(dsa_port_get_phy_sset_count);