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/netdevice.h>
  11#include <linux/notifier.h>
  12#include <linux/of_mdio.h>
  13#include <linux/of_net.h>
  14
  15#include "dsa.h"
  16#include "port.h"
 
  17#include "switch.h"
  18#include "tag_8021q.h"
  19#include "user.h"
  20
  21/**
  22 * dsa_port_notify - Notify the switching fabric of changes to a port
  23 * @dp: port on which change occurred
  24 * @e: event, must be of type DSA_NOTIFIER_*
  25 * @v: event-specific value.
  26 *
  27 * Notify all switches in the DSA tree that this port's switch belongs to,
  28 * including this switch itself, of an event. Allows the other switches to
  29 * reconfigure themselves for cross-chip operations. Can also be used to
  30 * reconfigure ports without net_devices (CPU ports, DSA links) whenever
  31 * a user port's state changes.
  32 */
  33static int dsa_port_notify(const struct dsa_port *dp, unsigned long e, void *v)
  34{
  35	return dsa_tree_notify(dp->ds->dst, e, v);
  36}
  37
  38static void dsa_port_notify_bridge_fdb_flush(const struct dsa_port *dp, u16 vid)
  39{
  40	struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
  41	struct switchdev_notifier_fdb_info info = {
  42		.vid = vid,
  43	};
  44
  45	/* When the port becomes standalone it has already left the bridge.
  46	 * Don't notify the bridge in that case.
  47	 */
  48	if (!brport_dev)
  49		return;
  50
  51	call_switchdev_notifiers(SWITCHDEV_FDB_FLUSH_TO_BRIDGE,
  52				 brport_dev, &info.info, NULL);
  53}
  54
  55static void dsa_port_fast_age(const struct dsa_port *dp)
  56{
  57	struct dsa_switch *ds = dp->ds;
  58
  59	if (!ds->ops->port_fast_age)
  60		return;
  61
  62	ds->ops->port_fast_age(ds, dp->index);
  63
  64	/* flush all VLANs */
  65	dsa_port_notify_bridge_fdb_flush(dp, 0);
  66}
  67
  68static int dsa_port_vlan_fast_age(const struct dsa_port *dp, u16 vid)
  69{
  70	struct dsa_switch *ds = dp->ds;
  71	int err;
  72
  73	if (!ds->ops->port_vlan_fast_age)
  74		return -EOPNOTSUPP;
  75
  76	err = ds->ops->port_vlan_fast_age(ds, dp->index, vid);
  77
  78	if (!err)
  79		dsa_port_notify_bridge_fdb_flush(dp, vid);
  80
  81	return err;
  82}
  83
  84static int dsa_port_msti_fast_age(const struct dsa_port *dp, u16 msti)
  85{
  86	DECLARE_BITMAP(vids, VLAN_N_VID) = { 0 };
  87	int err, vid;
  88
  89	err = br_mst_get_info(dsa_port_bridge_dev_get(dp), msti, vids);
  90	if (err)
  91		return err;
  92
  93	for_each_set_bit(vid, vids, VLAN_N_VID) {
  94		err = dsa_port_vlan_fast_age(dp, vid);
  95		if (err)
  96			return err;
  97	}
  98
  99	return 0;
 100}
 101
 102static bool dsa_port_can_configure_learning(struct dsa_port *dp)
 103{
 104	struct switchdev_brport_flags flags = {
 105		.mask = BR_LEARNING,
 106	};
 107	struct dsa_switch *ds = dp->ds;
 108	int err;
 109
 110	if (!ds->ops->port_bridge_flags || !ds->ops->port_pre_bridge_flags)
 111		return false;
 112
 113	err = ds->ops->port_pre_bridge_flags(ds, dp->index, flags, NULL);
 114	return !err;
 115}
 116
 117bool dsa_port_supports_hwtstamp(struct dsa_port *dp)
 118{
 119	struct dsa_switch *ds = dp->ds;
 120	struct ifreq ifr = {};
 121	int err;
 122
 123	if (!ds->ops->port_hwtstamp_get || !ds->ops->port_hwtstamp_set)
 124		return false;
 125
 126	/* "See through" shim implementations of the "get" method.
 127	 * Since we can't cook up a complete ioctl request structure, this will
 128	 * fail in copy_to_user() with -EFAULT, which hopefully is enough to
 129	 * detect a valid implementation.
 130	 */
 131	err = ds->ops->port_hwtstamp_get(ds, dp->index, &ifr);
 132	return err != -EOPNOTSUPP;
 133}
 134
 135int dsa_port_set_state(struct dsa_port *dp, u8 state, bool do_fast_age)
 136{
 137	struct dsa_switch *ds = dp->ds;
 138	int port = dp->index;
 139
 140	if (!ds->ops->port_stp_state_set)
 141		return -EOPNOTSUPP;
 142
 143	ds->ops->port_stp_state_set(ds, port, state);
 144
 145	if (!dsa_port_can_configure_learning(dp) ||
 146	    (do_fast_age && dp->learning)) {
 147		/* Fast age FDB entries or flush appropriate forwarding database
 148		 * for the given port, if we are moving it from Learning or
 149		 * Forwarding state, to Disabled or Blocking or Listening state.
 150		 * Ports that were standalone before the STP state change don't
 151		 * need to fast age the FDB, since address learning is off in
 152		 * standalone mode.
 153		 */
 154
 155		if ((dp->stp_state == BR_STATE_LEARNING ||
 156		     dp->stp_state == BR_STATE_FORWARDING) &&
 157		    (state == BR_STATE_DISABLED ||
 158		     state == BR_STATE_BLOCKING ||
 159		     state == BR_STATE_LISTENING))
 160			dsa_port_fast_age(dp);
 161	}
 162
 163	dp->stp_state = state;
 164
 165	return 0;
 166}
 167
 168static void dsa_port_set_state_now(struct dsa_port *dp, u8 state,
 169				   bool do_fast_age)
 170{
 171	struct dsa_switch *ds = dp->ds;
 172	int err;
 173
 174	err = dsa_port_set_state(dp, state, do_fast_age);
 175	if (err && err != -EOPNOTSUPP) {
 176		dev_err(ds->dev, "port %d failed to set STP state %u: %pe\n",
 177			dp->index, state, ERR_PTR(err));
 178	}
 179}
 180
 181int dsa_port_set_mst_state(struct dsa_port *dp,
 182			   const struct switchdev_mst_state *state,
 183			   struct netlink_ext_ack *extack)
 184{
 185	struct dsa_switch *ds = dp->ds;
 186	u8 prev_state;
 187	int err;
 188
 189	if (!ds->ops->port_mst_state_set)
 190		return -EOPNOTSUPP;
 191
 192	err = br_mst_get_state(dsa_port_to_bridge_port(dp), state->msti,
 193			       &prev_state);
 194	if (err)
 195		return err;
 196
 197	err = ds->ops->port_mst_state_set(ds, dp->index, state);
 198	if (err)
 199		return err;
 200
 201	if (!(dp->learning &&
 202	      (prev_state == BR_STATE_LEARNING ||
 203	       prev_state == BR_STATE_FORWARDING) &&
 204	      (state->state == BR_STATE_DISABLED ||
 205	       state->state == BR_STATE_BLOCKING ||
 206	       state->state == BR_STATE_LISTENING)))
 207		return 0;
 208
 209	err = dsa_port_msti_fast_age(dp, state->msti);
 210	if (err)
 211		NL_SET_ERR_MSG_MOD(extack,
 212				   "Unable to flush associated VLANs");
 213
 214	return 0;
 215}
 216
 217int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy)
 218{
 219	struct dsa_switch *ds = dp->ds;
 220	int port = dp->index;
 221	int err;
 222
 223	if (ds->ops->port_enable) {
 224		err = ds->ops->port_enable(ds, port, phy);
 225		if (err)
 226			return err;
 227	}
 228
 229	if (!dp->bridge)
 230		dsa_port_set_state_now(dp, BR_STATE_FORWARDING, false);
 231
 232	if (dp->pl)
 233		phylink_start(dp->pl);
 234
 235	return 0;
 236}
 237
 238int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
 239{
 240	int err;
 241
 242	rtnl_lock();
 243	err = dsa_port_enable_rt(dp, phy);
 244	rtnl_unlock();
 245
 246	return err;
 247}
 248
 249void dsa_port_disable_rt(struct dsa_port *dp)
 250{
 251	struct dsa_switch *ds = dp->ds;
 252	int port = dp->index;
 253
 254	if (dp->pl)
 255		phylink_stop(dp->pl);
 256
 257	if (!dp->bridge)
 258		dsa_port_set_state_now(dp, BR_STATE_DISABLED, false);
 259
 260	if (ds->ops->port_disable)
 261		ds->ops->port_disable(ds, port);
 262}
 263
 264void dsa_port_disable(struct dsa_port *dp)
 265{
 266	rtnl_lock();
 267	dsa_port_disable_rt(dp);
 268	rtnl_unlock();
 269}
 270
 271static void dsa_port_reset_vlan_filtering(struct dsa_port *dp,
 272					  struct dsa_bridge bridge)
 273{
 274	struct netlink_ext_ack extack = {0};
 275	bool change_vlan_filtering = false;
 276	struct dsa_switch *ds = dp->ds;
 277	struct dsa_port *other_dp;
 278	bool vlan_filtering;
 279	int err;
 280
 281	if (ds->needs_standalone_vlan_filtering &&
 282	    !br_vlan_enabled(bridge.dev)) {
 283		change_vlan_filtering = true;
 284		vlan_filtering = true;
 285	} else if (!ds->needs_standalone_vlan_filtering &&
 286		   br_vlan_enabled(bridge.dev)) {
 287		change_vlan_filtering = true;
 288		vlan_filtering = false;
 289	}
 290
 291	/* If the bridge was vlan_filtering, the bridge core doesn't trigger an
 292	 * event for changing vlan_filtering setting upon user ports leaving
 293	 * it. That is a good thing, because that lets us handle it and also
 294	 * handle the case where the switch's vlan_filtering setting is global
 295	 * (not per port). When that happens, the correct moment to trigger the
 296	 * vlan_filtering callback is only when the last port leaves the last
 297	 * VLAN-aware bridge.
 298	 */
 299	if (change_vlan_filtering && ds->vlan_filtering_is_global) {
 300		dsa_switch_for_each_port(other_dp, ds) {
 301			struct net_device *br = dsa_port_bridge_dev_get(other_dp);
 302
 303			if (br && br_vlan_enabled(br)) {
 304				change_vlan_filtering = false;
 305				break;
 306			}
 307		}
 308	}
 309
 310	if (!change_vlan_filtering)
 311		return;
 312
 313	err = dsa_port_vlan_filtering(dp, vlan_filtering, &extack);
 314	if (extack._msg) {
 315		dev_err(ds->dev, "port %d: %s\n", dp->index,
 316			extack._msg);
 317	}
 318	if (err && err != -EOPNOTSUPP) {
 319		dev_err(ds->dev,
 320			"port %d failed to reset VLAN filtering to %d: %pe\n",
 321		       dp->index, vlan_filtering, ERR_PTR(err));
 322	}
 323}
 324
 325static int dsa_port_inherit_brport_flags(struct dsa_port *dp,
 326					 struct netlink_ext_ack *extack)
 327{
 328	const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
 329				   BR_BCAST_FLOOD | BR_PORT_LOCKED;
 330	struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
 331	int flag, err;
 332
 333	for_each_set_bit(flag, &mask, 32) {
 334		struct switchdev_brport_flags flags = {0};
 335
 336		flags.mask = BIT(flag);
 337
 338		if (br_port_flag_is_set(brport_dev, BIT(flag)))
 339			flags.val = BIT(flag);
 340
 341		err = dsa_port_bridge_flags(dp, flags, extack);
 342		if (err && err != -EOPNOTSUPP)
 343			return err;
 344	}
 345
 346	return 0;
 347}
 348
 349static void dsa_port_clear_brport_flags(struct dsa_port *dp)
 350{
 351	const unsigned long val = BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD;
 352	const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
 353				   BR_BCAST_FLOOD | BR_PORT_LOCKED;
 354	int flag, err;
 355
 356	for_each_set_bit(flag, &mask, 32) {
 357		struct switchdev_brport_flags flags = {0};
 358
 359		flags.mask = BIT(flag);
 360		flags.val = val & BIT(flag);
 361
 362		err = dsa_port_bridge_flags(dp, flags, NULL);
 363		if (err && err != -EOPNOTSUPP)
 364			dev_err(dp->ds->dev,
 365				"failed to clear bridge port flag %lu: %pe\n",
 366				flags.val, ERR_PTR(err));
 367	}
 368}
 369
 370static int dsa_port_switchdev_sync_attrs(struct dsa_port *dp,
 371					 struct netlink_ext_ack *extack)
 372{
 373	struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
 374	struct net_device *br = dsa_port_bridge_dev_get(dp);
 375	int err;
 376
 377	err = dsa_port_inherit_brport_flags(dp, extack);
 378	if (err)
 379		return err;
 380
 381	err = dsa_port_set_state(dp, br_port_get_stp_state(brport_dev), false);
 382	if (err && err != -EOPNOTSUPP)
 383		return err;
 384
 385	err = dsa_port_vlan_filtering(dp, br_vlan_enabled(br), extack);
 386	if (err && err != -EOPNOTSUPP)
 387		return err;
 388
 389	err = dsa_port_ageing_time(dp, br_get_ageing_time(br));
 390	if (err && err != -EOPNOTSUPP)
 391		return err;
 392
 393	return 0;
 394}
 395
 396static void dsa_port_switchdev_unsync_attrs(struct dsa_port *dp,
 397					    struct dsa_bridge bridge)
 398{
 399	/* Configure the port for standalone mode (no address learning,
 400	 * flood everything).
 401	 * The bridge only emits SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS events
 402	 * when the user requests it through netlink or sysfs, but not
 403	 * automatically at port join or leave, so we need to handle resetting
 404	 * the brport flags ourselves. But we even prefer it that way, because
 405	 * otherwise, some setups might never get the notification they need,
 406	 * for example, when a port leaves a LAG that offloads the bridge,
 407	 * it becomes standalone, but as far as the bridge is concerned, no
 408	 * port ever left.
 409	 */
 410	dsa_port_clear_brport_flags(dp);
 411
 412	/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 413	 * so allow it to be in BR_STATE_FORWARDING to be kept functional
 414	 */
 415	dsa_port_set_state_now(dp, BR_STATE_FORWARDING, true);
 416
 417	dsa_port_reset_vlan_filtering(dp, bridge);
 418
 419	/* Ageing time may be global to the switch chip, so don't change it
 420	 * here because we have no good reason (or value) to change it to.
 421	 */
 422}
 423
 424static int dsa_port_bridge_create(struct dsa_port *dp,
 425				  struct net_device *br,
 426				  struct netlink_ext_ack *extack)
 427{
 428	struct dsa_switch *ds = dp->ds;
 429	struct dsa_bridge *bridge;
 430
 431	bridge = dsa_tree_bridge_find(ds->dst, br);
 432	if (bridge) {
 433		refcount_inc(&bridge->refcount);
 434		dp->bridge = bridge;
 435		return 0;
 436	}
 437
 438	bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
 439	if (!bridge)
 440		return -ENOMEM;
 441
 442	refcount_set(&bridge->refcount, 1);
 443
 444	bridge->dev = br;
 445
 446	bridge->num = dsa_bridge_num_get(br, ds->max_num_bridges);
 447	if (ds->max_num_bridges && !bridge->num) {
 448		NL_SET_ERR_MSG_MOD(extack,
 449				   "Range of offloadable bridges exceeded");
 450		kfree(bridge);
 451		return -EOPNOTSUPP;
 452	}
 453
 454	dp->bridge = bridge;
 455
 456	return 0;
 457}
 458
 459static void dsa_port_bridge_destroy(struct dsa_port *dp,
 460				    const struct net_device *br)
 461{
 462	struct dsa_bridge *bridge = dp->bridge;
 463
 464	dp->bridge = NULL;
 465
 466	if (!refcount_dec_and_test(&bridge->refcount))
 467		return;
 468
 469	if (bridge->num)
 470		dsa_bridge_num_put(br, bridge->num);
 471
 472	kfree(bridge);
 473}
 474
 475static bool dsa_port_supports_mst(struct dsa_port *dp)
 476{
 477	struct dsa_switch *ds = dp->ds;
 478
 479	return ds->ops->vlan_msti_set &&
 480		ds->ops->port_mst_state_set &&
 481		ds->ops->port_vlan_fast_age &&
 482		dsa_port_can_configure_learning(dp);
 483}
 484
 485int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br,
 486			 struct netlink_ext_ack *extack)
 487{
 488	struct dsa_notifier_bridge_info info = {
 489		.dp = dp,
 490		.extack = extack,
 491	};
 492	struct net_device *dev = dp->user;
 493	struct net_device *brport_dev;
 494	int err;
 495
 496	if (br_mst_enabled(br) && !dsa_port_supports_mst(dp))
 497		return -EOPNOTSUPP;
 498
 499	/* Here the interface is already bridged. Reflect the current
 500	 * configuration so that drivers can program their chips accordingly.
 501	 */
 502	err = dsa_port_bridge_create(dp, br, extack);
 503	if (err)
 504		return err;
 505
 506	brport_dev = dsa_port_to_bridge_port(dp);
 507
 508	info.bridge = *dp->bridge;
 509	err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_JOIN, &info);
 510	if (err)
 511		goto out_rollback;
 512
 513	/* Drivers which support bridge TX forwarding should set this */
 514	dp->bridge->tx_fwd_offload = info.tx_fwd_offload;
 515
 516	err = switchdev_bridge_port_offload(brport_dev, dev, dp,
 517					    &dsa_user_switchdev_notifier,
 518					    &dsa_user_switchdev_blocking_notifier,
 519					    dp->bridge->tx_fwd_offload, extack);
 520	if (err)
 521		goto out_rollback_unbridge;
 522
 523	err = dsa_port_switchdev_sync_attrs(dp, extack);
 524	if (err)
 525		goto out_rollback_unoffload;
 526
 527	return 0;
 528
 529out_rollback_unoffload:
 530	switchdev_bridge_port_unoffload(brport_dev, dp,
 531					&dsa_user_switchdev_notifier,
 532					&dsa_user_switchdev_blocking_notifier);
 533	dsa_flush_workqueue();
 534out_rollback_unbridge:
 535	dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
 536out_rollback:
 537	dsa_port_bridge_destroy(dp, br);
 538	return err;
 539}
 540
 541void dsa_port_pre_bridge_leave(struct dsa_port *dp, struct net_device *br)
 542{
 543	struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
 544
 545	/* Don't try to unoffload something that is not offloaded */
 546	if (!brport_dev)
 547		return;
 548
 549	switchdev_bridge_port_unoffload(brport_dev, dp,
 550					&dsa_user_switchdev_notifier,
 551					&dsa_user_switchdev_blocking_notifier);
 552
 553	dsa_flush_workqueue();
 554}
 555
 556void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
 557{
 558	struct dsa_notifier_bridge_info info = {
 559		.dp = dp,
 560	};
 561	int err;
 562
 563	/* If the port could not be offloaded to begin with, then
 564	 * there is nothing to do.
 565	 */
 566	if (!dp->bridge)
 567		return;
 568
 569	info.bridge = *dp->bridge;
 570
 571	/* Here the port is already unbridged. Reflect the current configuration
 572	 * so that drivers can program their chips accordingly.
 573	 */
 574	dsa_port_bridge_destroy(dp, br);
 575
 576	err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
 577	if (err)
 578		dev_err(dp->ds->dev,
 579			"port %d failed to notify DSA_NOTIFIER_BRIDGE_LEAVE: %pe\n",
 580			dp->index, ERR_PTR(err));
 581
 582	dsa_port_switchdev_unsync_attrs(dp, info.bridge);
 583}
 584
 585int dsa_port_lag_change(struct dsa_port *dp,
 586			struct netdev_lag_lower_state_info *linfo)
 587{
 588	struct dsa_notifier_lag_info info = {
 589		.dp = dp,
 590	};
 591	bool tx_enabled;
 592
 593	if (!dp->lag)
 594		return 0;
 595
 596	/* On statically configured aggregates (e.g. loadbalance
 597	 * without LACP) ports will always be tx_enabled, even if the
 598	 * link is down. Thus we require both link_up and tx_enabled
 599	 * in order to include it in the tx set.
 600	 */
 601	tx_enabled = linfo->link_up && linfo->tx_enabled;
 602
 603	if (tx_enabled == dp->lag_tx_enabled)
 604		return 0;
 605
 606	dp->lag_tx_enabled = tx_enabled;
 607
 608	return dsa_port_notify(dp, DSA_NOTIFIER_LAG_CHANGE, &info);
 609}
 610
 611static int dsa_port_lag_create(struct dsa_port *dp,
 612			       struct net_device *lag_dev)
 613{
 614	struct dsa_switch *ds = dp->ds;
 615	struct dsa_lag *lag;
 616
 617	lag = dsa_tree_lag_find(ds->dst, lag_dev);
 618	if (lag) {
 619		refcount_inc(&lag->refcount);
 620		dp->lag = lag;
 621		return 0;
 622	}
 623
 624	lag = kzalloc(sizeof(*lag), GFP_KERNEL);
 625	if (!lag)
 626		return -ENOMEM;
 627
 628	refcount_set(&lag->refcount, 1);
 629	mutex_init(&lag->fdb_lock);
 630	INIT_LIST_HEAD(&lag->fdbs);
 631	lag->dev = lag_dev;
 632	dsa_lag_map(ds->dst, lag);
 633	dp->lag = lag;
 634
 635	return 0;
 636}
 637
 638static void dsa_port_lag_destroy(struct dsa_port *dp)
 639{
 640	struct dsa_lag *lag = dp->lag;
 641
 642	dp->lag = NULL;
 643	dp->lag_tx_enabled = false;
 644
 645	if (!refcount_dec_and_test(&lag->refcount))
 646		return;
 647
 648	WARN_ON(!list_empty(&lag->fdbs));
 649	dsa_lag_unmap(dp->ds->dst, lag);
 650	kfree(lag);
 651}
 652
 653int dsa_port_lag_join(struct dsa_port *dp, struct net_device *lag_dev,
 654		      struct netdev_lag_upper_info *uinfo,
 655		      struct netlink_ext_ack *extack)
 656{
 657	struct dsa_notifier_lag_info info = {
 658		.dp = dp,
 659		.info = uinfo,
 660		.extack = extack,
 661	};
 662	struct net_device *bridge_dev;
 663	int err;
 664
 665	err = dsa_port_lag_create(dp, lag_dev);
 666	if (err)
 667		goto err_lag_create;
 668
 669	info.lag = *dp->lag;
 670	err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_JOIN, &info);
 671	if (err)
 672		goto err_lag_join;
 673
 674	bridge_dev = netdev_master_upper_dev_get(lag_dev);
 675	if (!bridge_dev || !netif_is_bridge_master(bridge_dev))
 676		return 0;
 677
 678	err = dsa_port_bridge_join(dp, bridge_dev, extack);
 679	if (err)
 680		goto err_bridge_join;
 681
 682	return 0;
 683
 684err_bridge_join:
 685	dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info);
 686err_lag_join:
 687	dsa_port_lag_destroy(dp);
 688err_lag_create:
 689	return err;
 690}
 691
 692void dsa_port_pre_lag_leave(struct dsa_port *dp, struct net_device *lag_dev)
 693{
 694	struct net_device *br = dsa_port_bridge_dev_get(dp);
 695
 696	if (br)
 697		dsa_port_pre_bridge_leave(dp, br);
 698}
 699
 700void dsa_port_lag_leave(struct dsa_port *dp, struct net_device *lag_dev)
 701{
 702	struct net_device *br = dsa_port_bridge_dev_get(dp);
 703	struct dsa_notifier_lag_info info = {
 704		.dp = dp,
 705	};
 706	int err;
 707
 708	if (!dp->lag)
 709		return;
 710
 711	/* Port might have been part of a LAG that in turn was
 712	 * attached to a bridge.
 713	 */
 714	if (br)
 715		dsa_port_bridge_leave(dp, br);
 716
 717	info.lag = *dp->lag;
 718
 719	dsa_port_lag_destroy(dp);
 720
 721	err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info);
 722	if (err)
 723		dev_err(dp->ds->dev,
 724			"port %d failed to notify DSA_NOTIFIER_LAG_LEAVE: %pe\n",
 725			dp->index, ERR_PTR(err));
 726}
 727
 728/* Must be called under rcu_read_lock() */
 729static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp,
 730					      bool vlan_filtering,
 731					      struct netlink_ext_ack *extack)
 732{
 733	struct dsa_switch *ds = dp->ds;
 734	struct dsa_port *other_dp;
 735	int err;
 736
 737	/* VLAN awareness was off, so the question is "can we turn it on".
 738	 * We may have had 8021q uppers, those need to go. Make sure we don't
 739	 * enter an inconsistent state: deny changing the VLAN awareness state
 740	 * as long as we have 8021q uppers.
 741	 */
 742	if (vlan_filtering && dsa_port_is_user(dp)) {
 743		struct net_device *br = dsa_port_bridge_dev_get(dp);
 744		struct net_device *upper_dev, *user = dp->user;
 745		struct list_head *iter;
 746
 747		netdev_for_each_upper_dev_rcu(user, upper_dev, iter) {
 748			struct bridge_vlan_info br_info;
 749			u16 vid;
 750
 751			if (!is_vlan_dev(upper_dev))
 752				continue;
 753
 754			vid = vlan_dev_vlan_id(upper_dev);
 755
 756			/* br_vlan_get_info() returns -EINVAL or -ENOENT if the
 757			 * device, respectively the VID is not found, returning
 758			 * 0 means success, which is a failure for us here.
 759			 */
 760			err = br_vlan_get_info(br, vid, &br_info);
 761			if (err == 0) {
 762				NL_SET_ERR_MSG_MOD(extack,
 763						   "Must first remove VLAN uppers having VIDs also present in bridge");
 764				return false;
 765			}
 766		}
 767	}
 768
 769	if (!ds->vlan_filtering_is_global)
 770		return true;
 771
 772	/* For cases where enabling/disabling VLAN awareness is global to the
 773	 * switch, we need to handle the case where multiple bridges span
 774	 * different ports of the same switch device and one of them has a
 775	 * different setting than what is being requested.
 776	 */
 777	dsa_switch_for_each_port(other_dp, ds) {
 778		struct net_device *other_br = dsa_port_bridge_dev_get(other_dp);
 779
 780		/* If it's the same bridge, it also has same
 781		 * vlan_filtering setting => no need to check
 782		 */
 783		if (!other_br || other_br == dsa_port_bridge_dev_get(dp))
 784			continue;
 785
 786		if (br_vlan_enabled(other_br) != vlan_filtering) {
 787			NL_SET_ERR_MSG_MOD(extack,
 788					   "VLAN filtering is a global setting");
 789			return false;
 790		}
 791	}
 792	return true;
 793}
 794
 795int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
 796			    struct netlink_ext_ack *extack)
 797{
 798	bool old_vlan_filtering = dsa_port_is_vlan_filtering(dp);
 799	struct dsa_switch *ds = dp->ds;
 800	bool apply;
 801	int err;
 802
 803	if (!ds->ops->port_vlan_filtering)
 804		return -EOPNOTSUPP;
 805
 806	/* We are called from dsa_user_switchdev_blocking_event(),
 807	 * which is not under rcu_read_lock(), unlike
 808	 * dsa_user_switchdev_event().
 809	 */
 810	rcu_read_lock();
 811	apply = dsa_port_can_apply_vlan_filtering(dp, vlan_filtering, extack);
 812	rcu_read_unlock();
 813	if (!apply)
 814		return -EINVAL;
 815
 816	if (dsa_port_is_vlan_filtering(dp) == vlan_filtering)
 817		return 0;
 818
 819	err = ds->ops->port_vlan_filtering(ds, dp->index, vlan_filtering,
 820					   extack);
 821	if (err)
 822		return err;
 823
 824	if (ds->vlan_filtering_is_global) {
 825		struct dsa_port *other_dp;
 826
 827		ds->vlan_filtering = vlan_filtering;
 828
 829		dsa_switch_for_each_user_port(other_dp, ds) {
 830			struct net_device *user = other_dp->user;
 831
 832			/* We might be called in the unbind path, so not
 833			 * all user devices might still be registered.
 834			 */
 835			if (!user)
 836				continue;
 837
 838			err = dsa_user_manage_vlan_filtering(user,
 839							     vlan_filtering);
 840			if (err)
 841				goto restore;
 842		}
 843	} else {
 844		dp->vlan_filtering = vlan_filtering;
 845
 846		err = dsa_user_manage_vlan_filtering(dp->user,
 847						     vlan_filtering);
 848		if (err)
 849			goto restore;
 850	}
 851
 852	return 0;
 853
 854restore:
 855	ds->ops->port_vlan_filtering(ds, dp->index, old_vlan_filtering, NULL);
 856
 857	if (ds->vlan_filtering_is_global)
 858		ds->vlan_filtering = old_vlan_filtering;
 859	else
 860		dp->vlan_filtering = old_vlan_filtering;
 861
 862	return err;
 863}
 864
 865/* This enforces legacy behavior for switch drivers which assume they can't
 866 * receive VLAN configuration when joining a bridge with vlan_filtering=0
 867 */
 868bool dsa_port_skip_vlan_configuration(struct dsa_port *dp)
 869{
 870	struct net_device *br = dsa_port_bridge_dev_get(dp);
 871	struct dsa_switch *ds = dp->ds;
 872
 873	if (!br)
 874		return false;
 875
 876	return !ds->configure_vlan_while_not_filtering && !br_vlan_enabled(br);
 877}
 878
 879int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock)
 880{
 881	unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
 882	unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
 883	struct dsa_notifier_ageing_time_info info;
 884	int err;
 885
 886	info.ageing_time = ageing_time;
 887
 888	err = dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
 889	if (err)
 890		return err;
 891
 892	dp->ageing_time = ageing_time;
 893
 894	return 0;
 895}
 896
 897int dsa_port_mst_enable(struct dsa_port *dp, bool on,
 898			struct netlink_ext_ack *extack)
 899{
 900	if (on && !dsa_port_supports_mst(dp)) {
 901		NL_SET_ERR_MSG_MOD(extack, "Hardware does not support MST");
 902		return -EINVAL;
 903	}
 904
 905	return 0;
 906}
 907
 908int dsa_port_pre_bridge_flags(const struct dsa_port *dp,
 909			      struct switchdev_brport_flags flags,
 910			      struct netlink_ext_ack *extack)
 911{
 912	struct dsa_switch *ds = dp->ds;
 913
 914	if (!ds->ops->port_pre_bridge_flags)
 915		return -EINVAL;
 916
 917	return ds->ops->port_pre_bridge_flags(ds, dp->index, flags, extack);
 918}
 919
 920int dsa_port_bridge_flags(struct dsa_port *dp,
 921			  struct switchdev_brport_flags flags,
 922			  struct netlink_ext_ack *extack)
 923{
 924	struct dsa_switch *ds = dp->ds;
 925	int err;
 926
 927	if (!ds->ops->port_bridge_flags)
 928		return -EOPNOTSUPP;
 929
 930	err = ds->ops->port_bridge_flags(ds, dp->index, flags, extack);
 931	if (err)
 932		return err;
 933
 934	if (flags.mask & BR_LEARNING) {
 935		bool learning = flags.val & BR_LEARNING;
 936
 937		if (learning == dp->learning)
 938			return 0;
 939
 940		if ((dp->learning && !learning) &&
 941		    (dp->stp_state == BR_STATE_LEARNING ||
 942		     dp->stp_state == BR_STATE_FORWARDING))
 943			dsa_port_fast_age(dp);
 944
 945		dp->learning = learning;
 946	}
 947
 948	return 0;
 949}
 950
 951void dsa_port_set_host_flood(struct dsa_port *dp, bool uc, bool mc)
 952{
 953	struct dsa_switch *ds = dp->ds;
 954
 955	if (ds->ops->port_set_host_flood)
 956		ds->ops->port_set_host_flood(ds, dp->index, uc, mc);
 957}
 958
 959int dsa_port_vlan_msti(struct dsa_port *dp,
 960		       const struct switchdev_vlan_msti *msti)
 961{
 962	struct dsa_switch *ds = dp->ds;
 963
 964	if (!ds->ops->vlan_msti_set)
 965		return -EOPNOTSUPP;
 966
 967	return ds->ops->vlan_msti_set(ds, *dp->bridge, msti);
 968}
 969
 970int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu)
 971{
 972	struct dsa_notifier_mtu_info info = {
 973		.dp = dp,
 974		.mtu = new_mtu,
 975	};
 976
 977	return dsa_port_notify(dp, DSA_NOTIFIER_MTU, &info);
 978}
 979
 980int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
 981		     u16 vid)
 982{
 983	struct dsa_notifier_fdb_info info = {
 984		.dp = dp,
 985		.addr = addr,
 986		.vid = vid,
 987		.db = {
 988			.type = DSA_DB_BRIDGE,
 989			.bridge = *dp->bridge,
 990		},
 991	};
 992
 993	/* Refcounting takes bridge.num as a key, and should be global for all
 994	 * bridges in the absence of FDB isolation, and per bridge otherwise.
 995	 * Force the bridge.num to zero here in the absence of FDB isolation.
 996	 */
 997	if (!dp->ds->fdb_isolation)
 998		info.db.bridge.num = 0;
 999
1000	return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info);
1001}
1002
1003int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
1004		     u16 vid)
1005{
1006	struct dsa_notifier_fdb_info info = {
1007		.dp = dp,
1008		.addr = addr,
1009		.vid = vid,
1010		.db = {
1011			.type = DSA_DB_BRIDGE,
1012			.bridge = *dp->bridge,
1013		},
1014	};
1015
1016	if (!dp->ds->fdb_isolation)
1017		info.db.bridge.num = 0;
1018
1019	return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info);
1020}
1021
1022static int dsa_port_host_fdb_add(struct dsa_port *dp,
1023				 const unsigned char *addr, u16 vid,
1024				 struct dsa_db db)
1025{
1026	struct dsa_notifier_fdb_info info = {
1027		.dp = dp,
1028		.addr = addr,
1029		.vid = vid,
1030		.db = db,
1031	};
1032
 
 
 
1033	return dsa_port_notify(dp, DSA_NOTIFIER_HOST_FDB_ADD, &info);
1034}
1035
1036int dsa_port_standalone_host_fdb_add(struct dsa_port *dp,
1037				     const unsigned char *addr, u16 vid)
1038{
1039	struct dsa_db db = {
1040		.type = DSA_DB_PORT,
1041		.dp = dp,
1042	};
1043
1044	return dsa_port_host_fdb_add(dp, addr, vid, db);
1045}
1046
1047int dsa_port_bridge_host_fdb_add(struct dsa_port *dp,
1048				 const unsigned char *addr, u16 vid)
1049{
1050	struct net_device *conduit = dsa_port_to_conduit(dp);
1051	struct dsa_db db = {
1052		.type = DSA_DB_BRIDGE,
1053		.bridge = *dp->bridge,
1054	};
1055	int err;
1056
1057	if (!dp->ds->fdb_isolation)
1058		db.bridge.num = 0;
1059
1060	/* Avoid a call to __dev_set_promiscuity() on the conduit, which
1061	 * requires rtnl_lock(), since we can't guarantee that is held here,
1062	 * and we can't take it either.
1063	 */
1064	if (conduit->priv_flags & IFF_UNICAST_FLT) {
1065		err = dev_uc_add(conduit, addr);
1066		if (err)
1067			return err;
1068	}
1069
1070	return dsa_port_host_fdb_add(dp, addr, vid, db);
1071}
1072
1073static int dsa_port_host_fdb_del(struct dsa_port *dp,
1074				 const unsigned char *addr, u16 vid,
1075				 struct dsa_db db)
1076{
1077	struct dsa_notifier_fdb_info info = {
1078		.dp = dp,
1079		.addr = addr,
1080		.vid = vid,
1081		.db = db,
1082	};
1083
 
 
 
1084	return dsa_port_notify(dp, DSA_NOTIFIER_HOST_FDB_DEL, &info);
1085}
1086
1087int dsa_port_standalone_host_fdb_del(struct dsa_port *dp,
1088				     const unsigned char *addr, u16 vid)
1089{
1090	struct dsa_db db = {
1091		.type = DSA_DB_PORT,
1092		.dp = dp,
1093	};
1094
1095	return dsa_port_host_fdb_del(dp, addr, vid, db);
1096}
1097
1098int dsa_port_bridge_host_fdb_del(struct dsa_port *dp,
1099				 const unsigned char *addr, u16 vid)
1100{
1101	struct net_device *conduit = dsa_port_to_conduit(dp);
1102	struct dsa_db db = {
1103		.type = DSA_DB_BRIDGE,
1104		.bridge = *dp->bridge,
1105	};
1106	int err;
1107
1108	if (!dp->ds->fdb_isolation)
1109		db.bridge.num = 0;
1110
1111	if (conduit->priv_flags & IFF_UNICAST_FLT) {
1112		err = dev_uc_del(conduit, addr);
1113		if (err)
1114			return err;
1115	}
1116
1117	return dsa_port_host_fdb_del(dp, addr, vid, db);
1118}
1119
1120int dsa_port_lag_fdb_add(struct dsa_port *dp, const unsigned char *addr,
1121			 u16 vid)
1122{
1123	struct dsa_notifier_lag_fdb_info info = {
1124		.lag = dp->lag,
1125		.addr = addr,
1126		.vid = vid,
1127		.db = {
1128			.type = DSA_DB_BRIDGE,
1129			.bridge = *dp->bridge,
1130		},
1131	};
1132
1133	if (!dp->ds->fdb_isolation)
1134		info.db.bridge.num = 0;
1135
1136	return dsa_port_notify(dp, DSA_NOTIFIER_LAG_FDB_ADD, &info);
1137}
1138
1139int dsa_port_lag_fdb_del(struct dsa_port *dp, const unsigned char *addr,
1140			 u16 vid)
1141{
1142	struct dsa_notifier_lag_fdb_info info = {
1143		.lag = dp->lag,
1144		.addr = addr,
1145		.vid = vid,
1146		.db = {
1147			.type = DSA_DB_BRIDGE,
1148			.bridge = *dp->bridge,
1149		},
1150	};
1151
1152	if (!dp->ds->fdb_isolation)
1153		info.db.bridge.num = 0;
1154
1155	return dsa_port_notify(dp, DSA_NOTIFIER_LAG_FDB_DEL, &info);
1156}
1157
1158int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data)
1159{
1160	struct dsa_switch *ds = dp->ds;
1161	int port = dp->index;
1162
1163	if (!ds->ops->port_fdb_dump)
1164		return -EOPNOTSUPP;
1165
1166	return ds->ops->port_fdb_dump(ds, port, cb, data);
1167}
1168
1169int dsa_port_mdb_add(const struct dsa_port *dp,
1170		     const struct switchdev_obj_port_mdb *mdb)
1171{
1172	struct dsa_notifier_mdb_info info = {
1173		.dp = dp,
1174		.mdb = mdb,
1175		.db = {
1176			.type = DSA_DB_BRIDGE,
1177			.bridge = *dp->bridge,
1178		},
1179	};
1180
1181	if (!dp->ds->fdb_isolation)
1182		info.db.bridge.num = 0;
1183
1184	return dsa_port_notify(dp, DSA_NOTIFIER_MDB_ADD, &info);
1185}
1186
1187int dsa_port_mdb_del(const struct dsa_port *dp,
1188		     const struct switchdev_obj_port_mdb *mdb)
1189{
1190	struct dsa_notifier_mdb_info info = {
1191		.dp = dp,
1192		.mdb = mdb,
1193		.db = {
1194			.type = DSA_DB_BRIDGE,
1195			.bridge = *dp->bridge,
1196		},
1197	};
1198
1199	if (!dp->ds->fdb_isolation)
1200		info.db.bridge.num = 0;
1201
1202	return dsa_port_notify(dp, DSA_NOTIFIER_MDB_DEL, &info);
1203}
1204
1205static int dsa_port_host_mdb_add(const struct dsa_port *dp,
1206				 const struct switchdev_obj_port_mdb *mdb,
1207				 struct dsa_db db)
1208{
1209	struct dsa_notifier_mdb_info info = {
1210		.dp = dp,
1211		.mdb = mdb,
1212		.db = db,
1213	};
1214
 
 
 
1215	return dsa_port_notify(dp, DSA_NOTIFIER_HOST_MDB_ADD, &info);
1216}
1217
1218int dsa_port_standalone_host_mdb_add(const struct dsa_port *dp,
1219				     const struct switchdev_obj_port_mdb *mdb)
1220{
1221	struct dsa_db db = {
1222		.type = DSA_DB_PORT,
1223		.dp = dp,
1224	};
1225
1226	return dsa_port_host_mdb_add(dp, mdb, db);
1227}
1228
1229int dsa_port_bridge_host_mdb_add(const struct dsa_port *dp,
1230				 const struct switchdev_obj_port_mdb *mdb)
1231{
1232	struct net_device *conduit = dsa_port_to_conduit(dp);
1233	struct dsa_db db = {
1234		.type = DSA_DB_BRIDGE,
1235		.bridge = *dp->bridge,
1236	};
1237	int err;
1238
1239	if (!dp->ds->fdb_isolation)
1240		db.bridge.num = 0;
1241
1242	err = dev_mc_add(conduit, mdb->addr);
1243	if (err)
1244		return err;
1245
1246	return dsa_port_host_mdb_add(dp, mdb, db);
1247}
1248
1249static int dsa_port_host_mdb_del(const struct dsa_port *dp,
1250				 const struct switchdev_obj_port_mdb *mdb,
1251				 struct dsa_db db)
1252{
1253	struct dsa_notifier_mdb_info info = {
1254		.dp = dp,
1255		.mdb = mdb,
1256		.db = db,
1257	};
1258
 
 
 
1259	return dsa_port_notify(dp, DSA_NOTIFIER_HOST_MDB_DEL, &info);
1260}
1261
1262int dsa_port_standalone_host_mdb_del(const struct dsa_port *dp,
1263				     const struct switchdev_obj_port_mdb *mdb)
1264{
1265	struct dsa_db db = {
1266		.type = DSA_DB_PORT,
1267		.dp = dp,
1268	};
1269
1270	return dsa_port_host_mdb_del(dp, mdb, db);
1271}
1272
1273int dsa_port_bridge_host_mdb_del(const struct dsa_port *dp,
1274				 const struct switchdev_obj_port_mdb *mdb)
1275{
1276	struct net_device *conduit = dsa_port_to_conduit(dp);
1277	struct dsa_db db = {
1278		.type = DSA_DB_BRIDGE,
1279		.bridge = *dp->bridge,
1280	};
1281	int err;
1282
1283	if (!dp->ds->fdb_isolation)
1284		db.bridge.num = 0;
1285
1286	err = dev_mc_del(conduit, mdb->addr);
1287	if (err)
1288		return err;
1289
1290	return dsa_port_host_mdb_del(dp, mdb, db);
1291}
1292
1293int dsa_port_vlan_add(struct dsa_port *dp,
1294		      const struct switchdev_obj_port_vlan *vlan,
1295		      struct netlink_ext_ack *extack)
1296{
1297	struct dsa_notifier_vlan_info info = {
1298		.dp = dp,
1299		.vlan = vlan,
1300		.extack = extack,
1301	};
1302
1303	return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);
1304}
1305
1306int dsa_port_vlan_del(struct dsa_port *dp,
1307		      const struct switchdev_obj_port_vlan *vlan)
1308{
1309	struct dsa_notifier_vlan_info info = {
1310		.dp = dp,
1311		.vlan = vlan,
1312	};
1313
1314	return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);
1315}
1316
1317int dsa_port_host_vlan_add(struct dsa_port *dp,
1318			   const struct switchdev_obj_port_vlan *vlan,
1319			   struct netlink_ext_ack *extack)
1320{
1321	struct net_device *conduit = dsa_port_to_conduit(dp);
1322	struct dsa_notifier_vlan_info info = {
1323		.dp = dp,
1324		.vlan = vlan,
1325		.extack = extack,
1326	};
1327	int err;
1328
1329	err = dsa_port_notify(dp, DSA_NOTIFIER_HOST_VLAN_ADD, &info);
1330	if (err && err != -EOPNOTSUPP)
1331		return err;
1332
1333	vlan_vid_add(conduit, htons(ETH_P_8021Q), vlan->vid);
1334
1335	return err;
1336}
1337
1338int dsa_port_host_vlan_del(struct dsa_port *dp,
1339			   const struct switchdev_obj_port_vlan *vlan)
1340{
1341	struct net_device *conduit = dsa_port_to_conduit(dp);
1342	struct dsa_notifier_vlan_info info = {
1343		.dp = dp,
1344		.vlan = vlan,
1345	};
1346	int err;
1347
1348	err = dsa_port_notify(dp, DSA_NOTIFIER_HOST_VLAN_DEL, &info);
1349	if (err && err != -EOPNOTSUPP)
1350		return err;
1351
1352	vlan_vid_del(conduit, htons(ETH_P_8021Q), vlan->vid);
1353
1354	return err;
1355}
1356
1357int dsa_port_mrp_add(const struct dsa_port *dp,
1358		     const struct switchdev_obj_mrp *mrp)
1359{
1360	struct dsa_switch *ds = dp->ds;
1361
1362	if (!ds->ops->port_mrp_add)
1363		return -EOPNOTSUPP;
1364
1365	return ds->ops->port_mrp_add(ds, dp->index, mrp);
1366}
1367
1368int dsa_port_mrp_del(const struct dsa_port *dp,
1369		     const struct switchdev_obj_mrp *mrp)
1370{
1371	struct dsa_switch *ds = dp->ds;
1372
1373	if (!ds->ops->port_mrp_del)
1374		return -EOPNOTSUPP;
1375
1376	return ds->ops->port_mrp_del(ds, dp->index, mrp);
1377}
1378
1379int dsa_port_mrp_add_ring_role(const struct dsa_port *dp,
1380			       const struct switchdev_obj_ring_role_mrp *mrp)
1381{
1382	struct dsa_switch *ds = dp->ds;
1383
1384	if (!ds->ops->port_mrp_add_ring_role)
1385		return -EOPNOTSUPP;
1386
1387	return ds->ops->port_mrp_add_ring_role(ds, dp->index, mrp);
1388}
1389
1390int dsa_port_mrp_del_ring_role(const struct dsa_port *dp,
1391			       const struct switchdev_obj_ring_role_mrp *mrp)
1392{
1393	struct dsa_switch *ds = dp->ds;
1394
1395	if (!ds->ops->port_mrp_del_ring_role)
1396		return -EOPNOTSUPP;
1397
1398	return ds->ops->port_mrp_del_ring_role(ds, dp->index, mrp);
1399}
1400
1401static int dsa_port_assign_conduit(struct dsa_port *dp,
1402				   struct net_device *conduit,
1403				   struct netlink_ext_ack *extack,
1404				   bool fail_on_err)
1405{
1406	struct dsa_switch *ds = dp->ds;
1407	int port = dp->index, err;
1408
1409	err = ds->ops->port_change_conduit(ds, port, conduit, extack);
1410	if (err && !fail_on_err)
1411		dev_err(ds->dev, "port %d failed to assign conduit %s: %pe\n",
1412			port, conduit->name, ERR_PTR(err));
1413
1414	if (err && fail_on_err)
1415		return err;
1416
1417	dp->cpu_dp = conduit->dsa_ptr;
1418	dp->cpu_port_in_lag = netif_is_lag_master(conduit);
1419
1420	return 0;
1421}
1422
1423/* Change the dp->cpu_dp affinity for a user port. Note that both cross-chip
1424 * notifiers and drivers have implicit assumptions about user-to-CPU-port
1425 * mappings, so we unfortunately cannot delay the deletion of the objects
1426 * (switchdev, standalone addresses, standalone VLANs) on the old CPU port
1427 * until the new CPU port has been set up. So we need to completely tear down
1428 * the old CPU port before changing it, and restore it on errors during the
1429 * bringup of the new one.
1430 */
1431int dsa_port_change_conduit(struct dsa_port *dp, struct net_device *conduit,
1432			    struct netlink_ext_ack *extack)
1433{
1434	struct net_device *bridge_dev = dsa_port_bridge_dev_get(dp);
1435	struct net_device *old_conduit = dsa_port_to_conduit(dp);
1436	struct net_device *dev = dp->user;
1437	struct dsa_switch *ds = dp->ds;
1438	bool vlan_filtering;
1439	int err, tmp;
1440
1441	/* Bridges may hold host FDB, MDB and VLAN objects. These need to be
1442	 * migrated, so dynamically unoffload and later reoffload the bridge
1443	 * port.
1444	 */
1445	if (bridge_dev) {
1446		dsa_port_pre_bridge_leave(dp, bridge_dev);
1447		dsa_port_bridge_leave(dp, bridge_dev);
1448	}
1449
1450	/* The port might still be VLAN filtering even if it's no longer
1451	 * under a bridge, either due to ds->vlan_filtering_is_global or
1452	 * ds->needs_standalone_vlan_filtering. In turn this means VLANs
1453	 * on the CPU port.
1454	 */
1455	vlan_filtering = dsa_port_is_vlan_filtering(dp);
1456	if (vlan_filtering) {
1457		err = dsa_user_manage_vlan_filtering(dev, false);
1458		if (err) {
1459			NL_SET_ERR_MSG_MOD(extack,
1460					   "Failed to remove standalone VLANs");
1461			goto rewind_old_bridge;
1462		}
1463	}
1464
1465	/* Standalone addresses, and addresses of upper interfaces like
1466	 * VLAN, LAG, HSR need to be migrated.
1467	 */
1468	dsa_user_unsync_ha(dev);
1469
1470	/* If live-changing, we also need to uninstall the user device address
1471	 * from the port FDB and the conduit interface.
1472	 */
1473	if (dev->flags & IFF_UP)
1474		dsa_user_host_uc_uninstall(dev);
1475
1476	err = dsa_port_assign_conduit(dp, conduit, extack, true);
1477	if (err)
1478		goto rewind_old_addrs;
1479
1480	/* If the port doesn't have its own MAC address and relies on the DSA
1481	 * conduit's one, inherit it again from the new DSA conduit.
1482	 */
1483	if (is_zero_ether_addr(dp->mac))
1484		eth_hw_addr_inherit(dev, conduit);
1485
1486	/* If live-changing, we need to install the user device address to the
1487	 * port FDB and the conduit interface.
1488	 */
1489	if (dev->flags & IFF_UP) {
1490		err = dsa_user_host_uc_install(dev, dev->dev_addr);
1491		if (err) {
1492			NL_SET_ERR_MSG_MOD(extack,
1493					   "Failed to install host UC address");
1494			goto rewind_addr_inherit;
1495		}
1496	}
1497
1498	dsa_user_sync_ha(dev);
1499
1500	if (vlan_filtering) {
1501		err = dsa_user_manage_vlan_filtering(dev, true);
1502		if (err) {
1503			NL_SET_ERR_MSG_MOD(extack,
1504					   "Failed to restore standalone VLANs");
1505			goto rewind_new_addrs;
1506		}
1507	}
1508
1509	if (bridge_dev) {
1510		err = dsa_port_bridge_join(dp, bridge_dev, extack);
1511		if (err && err == -EOPNOTSUPP) {
1512			NL_SET_ERR_MSG_MOD(extack,
1513					   "Failed to reoffload bridge");
1514			goto rewind_new_vlan;
1515		}
1516	}
1517
1518	return 0;
1519
1520rewind_new_vlan:
1521	if (vlan_filtering)
1522		dsa_user_manage_vlan_filtering(dev, false);
1523
1524rewind_new_addrs:
1525	dsa_user_unsync_ha(dev);
1526
1527	if (dev->flags & IFF_UP)
1528		dsa_user_host_uc_uninstall(dev);
1529
1530rewind_addr_inherit:
1531	if (is_zero_ether_addr(dp->mac))
1532		eth_hw_addr_inherit(dev, old_conduit);
1533
1534	dsa_port_assign_conduit(dp, old_conduit, NULL, false);
1535
1536/* Restore the objects on the old CPU port */
1537rewind_old_addrs:
1538	if (dev->flags & IFF_UP) {
1539		tmp = dsa_user_host_uc_install(dev, dev->dev_addr);
1540		if (tmp) {
1541			dev_err(ds->dev,
1542				"port %d failed to restore host UC address: %pe\n",
1543				dp->index, ERR_PTR(tmp));
1544		}
1545	}
1546
1547	dsa_user_sync_ha(dev);
1548
1549	if (vlan_filtering) {
1550		tmp = dsa_user_manage_vlan_filtering(dev, true);
1551		if (tmp) {
1552			dev_err(ds->dev,
1553				"port %d failed to restore standalone VLANs: %pe\n",
1554				dp->index, ERR_PTR(tmp));
1555		}
1556	}
1557
1558rewind_old_bridge:
1559	if (bridge_dev) {
1560		tmp = dsa_port_bridge_join(dp, bridge_dev, extack);
1561		if (tmp) {
1562			dev_err(ds->dev,
1563				"port %d failed to rejoin bridge %s: %pe\n",
1564				dp->index, bridge_dev->name, ERR_PTR(tmp));
1565		}
1566	}
1567
1568	return err;
1569}
1570
1571void dsa_port_set_tag_protocol(struct dsa_port *cpu_dp,
1572			       const struct dsa_device_ops *tag_ops)
1573{
1574	cpu_dp->rcv = tag_ops->rcv;
1575	cpu_dp->tag_ops = tag_ops;
1576}
1577
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1578static void dsa_port_phylink_mac_config(struct phylink_config *config,
1579					unsigned int mode,
1580					const struct phylink_link_state *state)
1581{
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1582}
1583
1584static void dsa_port_phylink_mac_link_down(struct phylink_config *config,
1585					   unsigned int mode,
1586					   phy_interface_t interface)
1587{
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1588}
1589
1590static void dsa_port_phylink_mac_link_up(struct phylink_config *config,
1591					 struct phy_device *phydev,
1592					 unsigned int mode,
1593					 phy_interface_t interface,
1594					 int speed, int duplex,
1595					 bool tx_pause, bool rx_pause)
1596{
 
 
 
 
 
 
 
 
 
 
 
1597}
1598
1599static const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
 
 
 
1600	.mac_config = dsa_port_phylink_mac_config,
 
1601	.mac_link_down = dsa_port_phylink_mac_link_down,
1602	.mac_link_up = dsa_port_phylink_mac_link_up,
1603};
1604
1605int dsa_port_phylink_create(struct dsa_port *dp)
1606{
1607	const struct phylink_mac_ops *mac_ops;
1608	struct dsa_switch *ds = dp->ds;
1609	phy_interface_t mode;
1610	struct phylink *pl;
1611	int err;
1612
1613	err = of_get_phy_mode(dp->dn, &mode);
1614	if (err)
1615		mode = PHY_INTERFACE_MODE_NA;
1616
1617	if (ds->ops->phylink_get_caps) {
1618		ds->ops->phylink_get_caps(ds, dp->index, &dp->pl_config);
1619	} else {
1620		/* For legacy drivers */
1621		if (mode != PHY_INTERFACE_MODE_NA) {
1622			__set_bit(mode, dp->pl_config.supported_interfaces);
1623		} else {
1624			__set_bit(PHY_INTERFACE_MODE_INTERNAL,
1625				  dp->pl_config.supported_interfaces);
1626			__set_bit(PHY_INTERFACE_MODE_GMII,
1627				  dp->pl_config.supported_interfaces);
1628		}
1629	}
1630
1631	mac_ops = &dsa_port_phylink_mac_ops;
1632	if (ds->phylink_mac_ops)
1633		mac_ops = ds->phylink_mac_ops;
1634
1635	pl = phylink_create(&dp->pl_config, of_fwnode_handle(dp->dn), mode,
1636			    mac_ops);
1637	if (IS_ERR(pl)) {
1638		pr_err("error creating PHYLINK: %ld\n", PTR_ERR(pl));
1639		return PTR_ERR(pl);
1640	}
1641
1642	dp->pl = pl;
1643
1644	return 0;
1645}
1646
1647void dsa_port_phylink_destroy(struct dsa_port *dp)
1648{
1649	phylink_destroy(dp->pl);
1650	dp->pl = NULL;
1651}
1652
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1653static int dsa_shared_port_phylink_register(struct dsa_port *dp)
1654{
1655	struct dsa_switch *ds = dp->ds;
1656	struct device_node *port_dn = dp->dn;
1657	int err;
1658
1659	dp->pl_config.dev = ds->dev;
1660	dp->pl_config.type = PHYLINK_DEV;
1661
1662	err = dsa_port_phylink_create(dp);
1663	if (err)
1664		return err;
1665
1666	err = phylink_of_phy_connect(dp->pl, port_dn, 0);
1667	if (err && err != -ENODEV) {
1668		pr_err("could not attach to PHY: %d\n", err);
1669		goto err_phy_connect;
1670	}
1671
1672	return 0;
1673
1674err_phy_connect:
1675	dsa_port_phylink_destroy(dp);
1676	return err;
1677}
1678
1679/* During the initial DSA driver migration to OF, port nodes were sometimes
1680 * added to device trees with no indication of how they should operate from a
1681 * link management perspective (phy-handle, fixed-link, etc). Additionally, the
1682 * phy-mode may be absent. The interpretation of these port OF nodes depends on
1683 * their type.
1684 *
1685 * User ports with no phy-handle or fixed-link are expected to connect to an
1686 * internal PHY located on the ds->user_mii_bus at an MDIO address equal to
1687 * the port number. This description is still actively supported.
1688 *
1689 * Shared (CPU and DSA) ports with no phy-handle or fixed-link are expected to
1690 * operate at the maximum speed that their phy-mode is capable of. If the
1691 * phy-mode is absent, they are expected to operate using the phy-mode
1692 * supported by the port that gives the highest link speed. It is unspecified
1693 * if the port should use flow control or not, half duplex or full duplex, or
1694 * if the phy-mode is a SERDES link, whether in-band autoneg is expected to be
1695 * enabled or not.
1696 *
1697 * In the latter case of shared ports, omitting the link management description
1698 * from the firmware node is deprecated and strongly discouraged. DSA uses
1699 * phylink, which rejects the firmware nodes of these ports for lacking
1700 * required properties.
1701 *
1702 * For switches in this table, DSA will skip enforcing validation and will
1703 * later omit registering a phylink instance for the shared ports, if they lack
1704 * a fixed-link, a phy-handle, or a managed = "in-band-status" property.
1705 * It becomes the responsibility of the driver to ensure that these ports
1706 * operate at the maximum speed (whatever this means) and will interoperate
1707 * with the DSA conduit or other cascade port, since phylink methods will not be
1708 * invoked for them.
1709 *
1710 * If you are considering expanding this table for newly introduced switches,
1711 * think again. It is OK to remove switches from this table if there aren't DT
1712 * blobs in circulation which rely on defaulting the shared ports.
1713 */
1714static const char * const dsa_switches_apply_workarounds[] = {
1715#if IS_ENABLED(CONFIG_NET_DSA_XRS700X)
1716	"arrow,xrs7003e",
1717	"arrow,xrs7003f",
1718	"arrow,xrs7004e",
1719	"arrow,xrs7004f",
1720#endif
1721#if IS_ENABLED(CONFIG_B53)
1722	"brcm,bcm5325",
1723	"brcm,bcm53115",
1724	"brcm,bcm53125",
1725	"brcm,bcm53128",
1726	"brcm,bcm5365",
1727	"brcm,bcm5389",
1728	"brcm,bcm5395",
1729	"brcm,bcm5397",
1730	"brcm,bcm5398",
1731	"brcm,bcm53010-srab",
1732	"brcm,bcm53011-srab",
1733	"brcm,bcm53012-srab",
1734	"brcm,bcm53018-srab",
1735	"brcm,bcm53019-srab",
1736	"brcm,bcm5301x-srab",
1737	"brcm,bcm11360-srab",
1738	"brcm,bcm58522-srab",
1739	"brcm,bcm58525-srab",
1740	"brcm,bcm58535-srab",
1741	"brcm,bcm58622-srab",
1742	"brcm,bcm58623-srab",
1743	"brcm,bcm58625-srab",
1744	"brcm,bcm88312-srab",
1745	"brcm,cygnus-srab",
1746	"brcm,nsp-srab",
1747	"brcm,omega-srab",
1748	"brcm,bcm3384-switch",
1749	"brcm,bcm6328-switch",
1750	"brcm,bcm6368-switch",
1751	"brcm,bcm63xx-switch",
1752#endif
1753#if IS_ENABLED(CONFIG_NET_DSA_BCM_SF2)
1754	"brcm,bcm7445-switch-v4.0",
1755	"brcm,bcm7278-switch-v4.0",
1756	"brcm,bcm7278-switch-v4.8",
1757#endif
1758#if IS_ENABLED(CONFIG_NET_DSA_LANTIQ_GSWIP)
1759	"lantiq,xrx200-gswip",
1760	"lantiq,xrx300-gswip",
1761	"lantiq,xrx330-gswip",
1762#endif
1763#if IS_ENABLED(CONFIG_NET_DSA_MV88E6060)
1764	"marvell,mv88e6060",
1765#endif
1766#if IS_ENABLED(CONFIG_NET_DSA_MV88E6XXX)
1767	"marvell,mv88e6085",
1768	"marvell,mv88e6190",
1769	"marvell,mv88e6250",
1770#endif
1771#if IS_ENABLED(CONFIG_NET_DSA_MICROCHIP_KSZ_COMMON)
1772	"microchip,ksz8765",
1773	"microchip,ksz8794",
1774	"microchip,ksz8795",
1775	"microchip,ksz8863",
1776	"microchip,ksz8873",
1777	"microchip,ksz9477",
1778	"microchip,ksz9897",
1779	"microchip,ksz9893",
1780	"microchip,ksz9563",
1781	"microchip,ksz8563",
1782	"microchip,ksz9567",
1783#endif
1784#if IS_ENABLED(CONFIG_NET_DSA_SMSC_LAN9303_MDIO)
1785	"smsc,lan9303-mdio",
1786#endif
1787#if IS_ENABLED(CONFIG_NET_DSA_SMSC_LAN9303_I2C)
1788	"smsc,lan9303-i2c",
1789#endif
1790	NULL,
1791};
1792
1793static void dsa_shared_port_validate_of(struct dsa_port *dp,
1794					bool *missing_phy_mode,
1795					bool *missing_link_description)
1796{
1797	struct device_node *dn = dp->dn, *phy_np;
1798	struct dsa_switch *ds = dp->ds;
1799	phy_interface_t mode;
1800
1801	*missing_phy_mode = false;
1802	*missing_link_description = false;
1803
1804	if (of_get_phy_mode(dn, &mode)) {
1805		*missing_phy_mode = true;
1806		dev_err(ds->dev,
1807			"OF node %pOF of %s port %d lacks the required \"phy-mode\" property\n",
1808			dn, dsa_port_is_cpu(dp) ? "CPU" : "DSA", dp->index);
1809	}
1810
1811	/* Note: of_phy_is_fixed_link() also returns true for
1812	 * managed = "in-band-status"
1813	 */
1814	if (of_phy_is_fixed_link(dn))
1815		return;
1816
1817	phy_np = of_parse_phandle(dn, "phy-handle", 0);
1818	if (phy_np) {
1819		of_node_put(phy_np);
1820		return;
1821	}
1822
1823	*missing_link_description = true;
1824
1825	dev_err(ds->dev,
1826		"OF node %pOF of %s port %d lacks the required \"phy-handle\", \"fixed-link\" or \"managed\" properties\n",
1827		dn, dsa_port_is_cpu(dp) ? "CPU" : "DSA", dp->index);
1828}
1829
1830static void dsa_shared_port_link_down(struct dsa_port *dp)
1831{
1832	struct dsa_switch *ds = dp->ds;
1833
1834	if (ds->phylink_mac_ops && ds->phylink_mac_ops->mac_link_down)
1835		ds->phylink_mac_ops->mac_link_down(&dp->pl_config, MLO_AN_FIXED,
1836						   PHY_INTERFACE_MODE_NA);
1837}
1838
1839int dsa_shared_port_link_register_of(struct dsa_port *dp)
1840{
1841	struct dsa_switch *ds = dp->ds;
1842	bool missing_link_description;
1843	bool missing_phy_mode;
 
1844
1845	dsa_shared_port_validate_of(dp, &missing_phy_mode,
1846				    &missing_link_description);
1847
1848	if ((missing_phy_mode || missing_link_description) &&
1849	    !of_device_compatible_match(ds->dev->of_node,
1850					dsa_switches_apply_workarounds))
1851		return -EINVAL;
1852
1853	if (missing_link_description) {
1854		dev_warn(ds->dev,
1855			 "Skipping phylink registration for %s port %d\n",
1856			 dsa_port_is_cpu(dp) ? "CPU" : "DSA", dp->index);
1857	} else {
1858		dsa_shared_port_link_down(dp);
 
 
 
1859
1860		return dsa_shared_port_phylink_register(dp);
 
 
1861	}
1862
1863	return 0;
 
 
 
 
 
 
1864}
1865
1866void dsa_shared_port_link_unregister_of(struct dsa_port *dp)
1867{
1868	if (dp->pl) {
 
 
1869		rtnl_lock();
1870		phylink_disconnect_phy(dp->pl);
1871		rtnl_unlock();
1872		dsa_port_phylink_destroy(dp);
1873		return;
1874	}
 
 
 
 
 
1875}
1876
1877int dsa_port_hsr_join(struct dsa_port *dp, struct net_device *hsr,
1878		      struct netlink_ext_ack *extack)
1879{
1880	struct dsa_switch *ds = dp->ds;
1881	int err;
1882
1883	if (!ds->ops->port_hsr_join)
1884		return -EOPNOTSUPP;
1885
1886	dp->hsr_dev = hsr;
1887
1888	err = ds->ops->port_hsr_join(ds, dp->index, hsr, extack);
1889	if (err)
1890		dp->hsr_dev = NULL;
1891
1892	return err;
1893}
1894
1895void dsa_port_hsr_leave(struct dsa_port *dp, struct net_device *hsr)
1896{
1897	struct dsa_switch *ds = dp->ds;
1898	int err;
1899
1900	dp->hsr_dev = NULL;
1901
1902	if (ds->ops->port_hsr_leave) {
1903		err = ds->ops->port_hsr_leave(ds, dp->index, hsr);
1904		if (err)
1905			dev_err(dp->ds->dev,
1906				"port %d failed to leave HSR %s: %pe\n",
1907				dp->index, hsr->name, ERR_PTR(err));
1908	}
1909}
1910
1911int dsa_port_tag_8021q_vlan_add(struct dsa_port *dp, u16 vid, bool broadcast)
1912{
1913	struct dsa_notifier_tag_8021q_vlan_info info = {
1914		.dp = dp,
1915		.vid = vid,
1916	};
1917
1918	if (broadcast)
1919		return dsa_broadcast(DSA_NOTIFIER_TAG_8021Q_VLAN_ADD, &info);
1920
1921	return dsa_port_notify(dp, DSA_NOTIFIER_TAG_8021Q_VLAN_ADD, &info);
1922}
1923
1924void dsa_port_tag_8021q_vlan_del(struct dsa_port *dp, u16 vid, bool broadcast)
1925{
1926	struct dsa_notifier_tag_8021q_vlan_info info = {
1927		.dp = dp,
1928		.vid = vid,
1929	};
1930	int err;
1931
1932	if (broadcast)
1933		err = dsa_broadcast(DSA_NOTIFIER_TAG_8021Q_VLAN_DEL, &info);
1934	else
1935		err = dsa_port_notify(dp, DSA_NOTIFIER_TAG_8021Q_VLAN_DEL, &info);
1936	if (err)
1937		dev_err(dp->ds->dev,
1938			"port %d failed to notify tag_8021q VLAN %d deletion: %pe\n",
1939			dp->index, vid, ERR_PTR(err));
1940}