net/dsa/port.c

   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, bool do_fast_age)
  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 (do_fast_age && 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                  * Ports that were standalone before the STP state change don't
  48                  * need to fast age the FDB, since address learning is off in
  49                  * standalone mode.
  50                  */
  51
  52                 if ((dp->stp_state == BR_STATE_LEARNING ||
  53                      dp->stp_state == BR_STATE_FORWARDING) &&
  54                     (state == BR_STATE_DISABLED ||
  55                      state == BR_STATE_BLOCKING ||
  56                      state == BR_STATE_LISTENING))
  57                         ds->ops->port_fast_age(ds, port);
  58         }
  59
  60         dp->stp_state = state;
  61
  62         return 0;
  63 }
  64
  65 static void dsa_port_set_state_now(struct dsa_port *dp, u8 state,
  66                                    bool do_fast_age)
  67 {
  68         int err;
  69
  70         err = dsa_port_set_state(dp, state, do_fast_age);
  71         if (err)
  72                 pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
  73 }
  74
  75 int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy)
  76 {
  77         struct dsa_switch *ds = dp->ds;
  78         int port = dp->index;
  79         int err;
  80
  81         if (ds->ops->port_enable) {
  82                 err = ds->ops->port_enable(ds, port, phy);
  83                 if (err)
  84                         return err;
  85         }
  86
  87         if (!dp->bridge_dev)
  88                 dsa_port_set_state_now(dp, BR_STATE_FORWARDING, false);
  89
  90         if (dp->pl)
  91                 phylink_start(dp->pl);
  92
  93         return 0;
  94 }
  95
  96 int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
  97 {
  98         int err;
  99
 100         rtnl_lock();
 101         err = dsa_port_enable_rt(dp, phy);
 102         rtnl_unlock();
 103
 104         return err;
 105 }
 106
 107 void dsa_port_disable_rt(struct dsa_port *dp)
 108 {
 109         struct dsa_switch *ds = dp->ds;
 110         int port = dp->index;
 111
 112         if (dp->pl)
 113                 phylink_stop(dp->pl);
 114
 115         if (!dp->bridge_dev)
 116                 dsa_port_set_state_now(dp, BR_STATE_DISABLED, false);
 117
 118         if (ds->ops->port_disable)
 119                 ds->ops->port_disable(ds, port);
 120 }
 121
 122 void dsa_port_disable(struct dsa_port *dp)
 123 {
 124         rtnl_lock();
 125         dsa_port_disable_rt(dp);
 126         rtnl_unlock();
 127 }
 128
 129 static int dsa_port_inherit_brport_flags(struct dsa_port *dp,
 130                                          struct netlink_ext_ack *extack)
 131 {
 132         const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
 133                                    BR_BCAST_FLOOD;
 134         struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
 135         int flag, err;
 136
 137         for_each_set_bit(flag, &mask, 32) {
 138                 struct switchdev_brport_flags flags = {0};
 139
 140                 flags.mask = BIT(flag);
 141
 142                 if (br_port_flag_is_set(brport_dev, BIT(flag)))
 143                         flags.val = BIT(flag);
 144
 145                 err = dsa_port_bridge_flags(dp, flags, extack);
 146                 if (err && err != -EOPNOTSUPP)
 147                         return err;
 148         }
 149
 150         return 0;
 151 }
 152
 153 static void dsa_port_clear_brport_flags(struct dsa_port *dp)
 154 {
 155         const unsigned long val = BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD;
 156         const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
 157                                    BR_BCAST_FLOOD;
 158         int flag, err;
 159
 160         for_each_set_bit(flag, &mask, 32) {
 161                 struct switchdev_brport_flags flags = {0};
 162
 163                 flags.mask = BIT(flag);
 164                 flags.val = val & BIT(flag);
 165
 166                 err = dsa_port_bridge_flags(dp, flags, NULL);
 167                 if (err && err != -EOPNOTSUPP)
 168                         dev_err(dp->ds->dev,
 169                                 "failed to clear bridge port flag %lu: %pe\n",
 170                                 flags.val, ERR_PTR(err));
 171         }
 172 }
 173
 174 static int dsa_port_switchdev_sync_attrs(struct dsa_port *dp,
 175                                          struct netlink_ext_ack *extack)
 176 {
 177         struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
 178         struct net_device *br = dp->bridge_dev;
 179         int err;
 180
 181         err = dsa_port_inherit_brport_flags(dp, extack);
 182         if (err)
 183                 return err;
 184
 185         err = dsa_port_set_state(dp, br_port_get_stp_state(brport_dev), false);
 186         if (err && err != -EOPNOTSUPP)
 187                 return err;
 188
 189         err = dsa_port_vlan_filtering(dp, br_vlan_enabled(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         return 0;
 198 }
 199
 200 static void dsa_port_switchdev_unsync_attrs(struct dsa_port *dp)
 201 {
 202         /* Configure the port for standalone mode (no address learning,
 203          * flood everything).
 204          * The bridge only emits SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS events
 205          * when the user requests it through netlink or sysfs, but not
 206          * automatically at port join or leave, so we need to handle resetting
 207          * the brport flags ourselves. But we even prefer it that way, because
 208          * otherwise, some setups might never get the notification they need,
 209          * for example, when a port leaves a LAG that offloads the bridge,
 210          * it becomes standalone, but as far as the bridge is concerned, no
 211          * port ever left.
 212          */
 213         dsa_port_clear_brport_flags(dp);
 214
 215         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 216          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 217          */
 218         dsa_port_set_state_now(dp, BR_STATE_FORWARDING, true);
 219
 220         /* VLAN filtering is handled by dsa_switch_bridge_leave */
 221
 222         /* Ageing time may be global to the switch chip, so don't change it
 223          * here because we have no good reason (or value) to change it to.
 224          */
 225 }
 226
 227 static int dsa_tree_find_bridge_num(struct dsa_switch_tree *dst,
 228                                     struct net_device *bridge_dev)
 229 {
 230         struct dsa_port *dp;
 231
 232         /* When preparing the offload for a port, it will have a valid
 233          * dp->bridge_dev pointer but a not yet valid dp->bridge_num.
 234          * However there might be other ports having the same dp->bridge_dev
 235          * and a valid dp->bridge_num, so just ignore this port.
 236          */
 237         list_for_each_entry(dp, &dst->ports, list)
 238                 if (dp->bridge_dev == bridge_dev && dp->bridge_num != -1)
 239                         return dp->bridge_num;
 240
 241         return -1;
 242 }
 243
 244 static void dsa_port_bridge_tx_fwd_unoffload(struct dsa_port *dp,
 245                                              struct net_device *bridge_dev)
 246 {
 247         struct dsa_switch_tree *dst = dp->ds->dst;
 248         int bridge_num = dp->bridge_num;
 249         struct dsa_switch *ds = dp->ds;
 250
 251         /* No bridge TX forwarding offload => do nothing */
 252         if (!ds->ops->port_bridge_tx_fwd_unoffload || dp->bridge_num == -1)
 253                 return;
 254
 255         dp->bridge_num = -1;
 256
 257         /* Check if the bridge is still in use, otherwise it is time
 258          * to clean it up so we can reuse this bridge_num later.
 259          */
 260         if (!dsa_tree_find_bridge_num(dst, bridge_dev))
 261                 clear_bit(bridge_num, &dst->fwd_offloading_bridges);
 262
 263         /* Notify the chips only once the offload has been deactivated, so
 264          * that they can update their configuration accordingly.
 265          */
 266         ds->ops->port_bridge_tx_fwd_unoffload(ds, dp->index, bridge_dev,
 267                                               bridge_num);
 268 }
 269
 270 static bool dsa_port_bridge_tx_fwd_offload(struct dsa_port *dp,
 271                                            struct net_device *bridge_dev)
 272 {
 273         struct dsa_switch_tree *dst = dp->ds->dst;
 274         struct dsa_switch *ds = dp->ds;
 275         int bridge_num, err;
 276
 277         if (!ds->ops->port_bridge_tx_fwd_offload)
 278                 return false;
 279
 280         bridge_num = dsa_tree_find_bridge_num(dst, bridge_dev);
 281         if (bridge_num < 0) {
 282                 /* First port that offloads TX forwarding for this bridge */
 283                 bridge_num = find_first_zero_bit(&dst->fwd_offloading_bridges,
 284                                                  DSA_MAX_NUM_OFFLOADING_BRIDGES);
 285                 if (bridge_num >= ds->num_fwd_offloading_bridges)
 286                         return false;
 287
 288                 set_bit(bridge_num, &dst->fwd_offloading_bridges);
 289         }
 290
 291         dp->bridge_num = bridge_num;
 292
 293         /* Notify the driver */
 294         err = ds->ops->port_bridge_tx_fwd_offload(ds, dp->index, bridge_dev,
 295                                                   bridge_num);
 296         if (err) {
 297                 dsa_port_bridge_tx_fwd_unoffload(dp, bridge_dev);
 298                 return false;
 299         }
 300
 301         return true;
 302 }
 303
 304 int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br,
 305                          struct netlink_ext_ack *extack)
 306 {
 307         struct dsa_notifier_bridge_info info = {
 308                 .tree_index = dp->ds->dst->index,
 309                 .sw_index = dp->ds->index,
 310                 .port = dp->index,
 311                 .br = br,
 312         };
 313         struct net_device *dev = dp->slave;
 314         struct net_device *brport_dev;
 315         bool tx_fwd_offload;
 316         int err;
 317
 318         /* Here the interface is already bridged. Reflect the current
 319          * configuration so that drivers can program their chips accordingly.
 320          */
 321         dp->bridge_dev = br;
 322
 323         brport_dev = dsa_port_to_bridge_port(dp);
 324
 325         err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_JOIN, &info);
 326         if (err)
 327                 goto out_rollback;
 328
 329         tx_fwd_offload = dsa_port_bridge_tx_fwd_offload(dp, br);
 330
 331         err = switchdev_bridge_port_offload(brport_dev, dev, dp,
 332                                             &dsa_slave_switchdev_notifier,
 333                                             &dsa_slave_switchdev_blocking_notifier,
 334                                             tx_fwd_offload, extack);
 335         if (err)
 336                 goto out_rollback_unbridge;
 337
 338         err = dsa_port_switchdev_sync_attrs(dp, extack);
 339         if (err)
 340                 goto out_rollback_unoffload;
 341
 342         return 0;
 343
 344 out_rollback_unoffload:
 345         switchdev_bridge_port_unoffload(brport_dev, dp,
 346                                         &dsa_slave_switchdev_notifier,
 347                                         &dsa_slave_switchdev_blocking_notifier);
 348 out_rollback_unbridge:
 349         dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
 350 out_rollback:
 351         dp->bridge_dev = NULL;
 352         return err;
 353 }
 354
 355 void dsa_port_pre_bridge_leave(struct dsa_port *dp, struct net_device *br)
 356 {
 357         struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
 358
 359         switchdev_bridge_port_unoffload(brport_dev, dp,
 360                                         &dsa_slave_switchdev_notifier,
 361                                         &dsa_slave_switchdev_blocking_notifier);
 362 }
 363
 364 void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
 365 {
 366         struct dsa_notifier_bridge_info info = {
 367                 .tree_index = dp->ds->dst->index,
 368                 .sw_index = dp->ds->index,
 369                 .port = dp->index,
 370                 .br = br,
 371         };
 372         int err;
 373
 374         /* Here the port is already unbridged. Reflect the current configuration
 375          * so that drivers can program their chips accordingly.
 376          */
 377         dp->bridge_dev = NULL;
 378
 379         dsa_port_bridge_tx_fwd_unoffload(dp, br);
 380
 381         err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
 382         if (err)
 383                 pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
 384
 385         dsa_port_switchdev_unsync_attrs(dp);
 386 }
 387
 388 int dsa_port_lag_change(struct dsa_port *dp,
 389                         struct netdev_lag_lower_state_info *linfo)
 390 {
 391         struct dsa_notifier_lag_info info = {
 392                 .sw_index = dp->ds->index,
 393                 .port = dp->index,
 394         };
 395         bool tx_enabled;
 396
 397         if (!dp->lag_dev)
 398                 return 0;
 399
 400         /* On statically configured aggregates (e.g. loadbalance
 401          * without LACP) ports will always be tx_enabled, even if the
 402          * link is down. Thus we require both link_up and tx_enabled
 403          * in order to include it in the tx set.
 404          */
 405         tx_enabled = linfo->link_up && linfo->tx_enabled;
 406
 407         if (tx_enabled == dp->lag_tx_enabled)
 408                 return 0;
 409
 410         dp->lag_tx_enabled = tx_enabled;
 411
 412         return dsa_port_notify(dp, DSA_NOTIFIER_LAG_CHANGE, &info);
 413 }
 414
 415 int dsa_port_lag_join(struct dsa_port *dp, struct net_device *lag,
 416                       struct netdev_lag_upper_info *uinfo,
 417                       struct netlink_ext_ack *extack)
 418 {
 419         struct dsa_notifier_lag_info info = {
 420                 .sw_index = dp->ds->index,
 421                 .port = dp->index,
 422                 .lag = lag,
 423                 .info = uinfo,
 424         };
 425         struct net_device *bridge_dev;
 426         int err;
 427
 428         dsa_lag_map(dp->ds->dst, lag);
 429         dp->lag_dev = lag;
 430
 431         err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_JOIN, &info);
 432         if (err)
 433                 goto err_lag_join;
 434
 435         bridge_dev = netdev_master_upper_dev_get(lag);
 436         if (!bridge_dev || !netif_is_bridge_master(bridge_dev))
 437                 return 0;
 438
 439         err = dsa_port_bridge_join(dp, bridge_dev, extack);
 440         if (err)
 441                 goto err_bridge_join;
 442
 443         return 0;
 444
 445 err_bridge_join:
 446         dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info);
 447 err_lag_join:
 448         dp->lag_dev = NULL;
 449         dsa_lag_unmap(dp->ds->dst, lag);
 450         return err;
 451 }
 452
 453 void dsa_port_pre_lag_leave(struct dsa_port *dp, struct net_device *lag)
 454 {
 455         if (dp->bridge_dev)
 456                 dsa_port_pre_bridge_leave(dp, dp->bridge_dev);
 457 }
 458
 459 void dsa_port_lag_leave(struct dsa_port *dp, struct net_device *lag)
 460 {
 461         struct dsa_notifier_lag_info info = {
 462                 .sw_index = dp->ds->index,
 463                 .port = dp->index,
 464                 .lag = lag,
 465         };
 466         int err;
 467
 468         if (!dp->lag_dev)
 469                 return;
 470
 471         /* Port might have been part of a LAG that in turn was
 472          * attached to a bridge.
 473          */
 474         if (dp->bridge_dev)
 475                 dsa_port_bridge_leave(dp, dp->bridge_dev);
 476
 477         dp->lag_tx_enabled = false;
 478         dp->lag_dev = NULL;
 479
 480         err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info);
 481         if (err)
 482                 pr_err("DSA: failed to notify DSA_NOTIFIER_LAG_LEAVE: %d\n",
 483                        err);
 484
 485         dsa_lag_unmap(dp->ds->dst, lag);
 486 }
 487
 488 /* Must be called under rcu_read_lock() */
 489 static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp,
 490                                               bool vlan_filtering,
 491                                               struct netlink_ext_ack *extack)
 492 {
 493         struct dsa_switch *ds = dp->ds;
 494         int err, i;
 495
 496         /* VLAN awareness was off, so the question is "can we turn it on".
 497          * We may have had 8021q uppers, those need to go. Make sure we don't
 498          * enter an inconsistent state: deny changing the VLAN awareness state
 499          * as long as we have 8021q uppers.
 500          */
 501         if (vlan_filtering && dsa_is_user_port(ds, dp->index)) {
 502                 struct net_device *upper_dev, *slave = dp->slave;
 503                 struct net_device *br = dp->bridge_dev;
 504                 struct list_head *iter;
 505
 506                 netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 507                         struct bridge_vlan_info br_info;
 508                         u16 vid;
 509
 510                         if (!is_vlan_dev(upper_dev))
 511                                 continue;
 512
 513                         vid = vlan_dev_vlan_id(upper_dev);
 514
 515                         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
 516                          * device, respectively the VID is not found, returning
 517                          * 0 means success, which is a failure for us here.
 518                          */
 519                         err = br_vlan_get_info(br, vid, &br_info);
 520                         if (err == 0) {
 521                                 NL_SET_ERR_MSG_MOD(extack,
 522                                                    "Must first remove VLAN uppers having VIDs also present in bridge");
 523                                 return false;
 524                         }
 525                 }
 526         }
 527
 528         if (!ds->vlan_filtering_is_global)
 529                 return true;
 530
 531         /* For cases where enabling/disabling VLAN awareness is global to the
 532          * switch, we need to handle the case where multiple bridges span
 533          * different ports of the same switch device and one of them has a
 534          * different setting than what is being requested.
 535          */
 536         for (i = 0; i < ds->num_ports; i++) {
 537                 struct net_device *other_bridge;
 538
 539                 other_bridge = dsa_to_port(ds, i)->bridge_dev;
 540                 if (!other_bridge)
 541                         continue;
 542                 /* If it's the same bridge, it also has same
 543                  * vlan_filtering setting => no need to check
 544                  */
 545                 if (other_bridge == dp->bridge_dev)
 546                         continue;
 547                 if (br_vlan_enabled(other_bridge) != vlan_filtering) {
 548                         NL_SET_ERR_MSG_MOD(extack,
 549                                            "VLAN filtering is a global setting");
 550                         return false;
 551                 }
 552         }
 553         return true;
 554 }
 555
 556 int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
 557                             struct netlink_ext_ack *extack)
 558 {
 559         struct dsa_switch *ds = dp->ds;
 560         bool apply;
 561         int err;
 562
 563         if (!ds->ops->port_vlan_filtering)
 564                 return -EOPNOTSUPP;
 565
 566         /* We are called from dsa_slave_switchdev_blocking_event(),
 567          * which is not under rcu_read_lock(), unlike
 568          * dsa_slave_switchdev_event().
 569          */
 570         rcu_read_lock();
 571         apply = dsa_port_can_apply_vlan_filtering(dp, vlan_filtering, extack);
 572         rcu_read_unlock();
 573         if (!apply)
 574                 return -EINVAL;
 575
 576         if (dsa_port_is_vlan_filtering(dp) == vlan_filtering)
 577                 return 0;
 578
 579         err = ds->ops->port_vlan_filtering(ds, dp->index, vlan_filtering,
 580                                            extack);
 581         if (err)
 582                 return err;
 583
 584         if (ds->vlan_filtering_is_global)
 585                 ds->vlan_filtering = vlan_filtering;
 586         else
 587                 dp->vlan_filtering = vlan_filtering;
 588
 589         return 0;
 590 }
 591
 592 /* This enforces legacy behavior for switch drivers which assume they can't
 593  * receive VLAN configuration when enslaved to a bridge with vlan_filtering=0
 594  */
 595 bool dsa_port_skip_vlan_configuration(struct dsa_port *dp)
 596 {
 597         struct dsa_switch *ds = dp->ds;
 598
 599         if (!dp->bridge_dev)
 600                 return false;
 601
 602         return (!ds->configure_vlan_while_not_filtering &&
 603                 !br_vlan_enabled(dp->bridge_dev));
 604 }
 605
 606 int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock)
 607 {
 608         unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
 609         unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
 610         struct dsa_notifier_ageing_time_info info;
 611         int err;
 612
 613         info.ageing_time = ageing_time;
 614
 615         err = dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
 616         if (err)
 617                 return err;
 618
 619         dp->ageing_time = ageing_time;
 620
 621         return 0;
 622 }
 623
 624 int dsa_port_pre_bridge_flags(const struct dsa_port *dp,
 625                               struct switchdev_brport_flags flags,
 626                               struct netlink_ext_ack *extack)
 627 {
 628         struct dsa_switch *ds = dp->ds;
 629
 630         if (!ds->ops->port_pre_bridge_flags)
 631                 return -EINVAL;
 632
 633         return ds->ops->port_pre_bridge_flags(ds, dp->index, flags, extack);
 634 }
 635
 636 int dsa_port_bridge_flags(const struct dsa_port *dp,
 637                           struct switchdev_brport_flags flags,
 638                           struct netlink_ext_ack *extack)
 639 {
 640         struct dsa_switch *ds = dp->ds;
 641
 642         if (!ds->ops->port_bridge_flags)
 643                 return -EOPNOTSUPP;
 644
 645         return ds->ops->port_bridge_flags(ds, dp->index, flags, extack);
 646 }
 647
 648 int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu,
 649                         bool targeted_match)
 650 {
 651         struct dsa_notifier_mtu_info info = {
 652                 .sw_index = dp->ds->index,
 653                 .targeted_match = targeted_match,
 654                 .port = dp->index,
 655                 .mtu = new_mtu,
 656         };
 657
 658         return dsa_port_notify(dp, DSA_NOTIFIER_MTU, &info);
 659 }
 660
 661 int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
 662                      u16 vid)
 663 {
 664         struct dsa_notifier_fdb_info info = {
 665                 .sw_index = dp->ds->index,
 666                 .port = dp->index,
 667                 .addr = addr,
 668                 .vid = vid,
 669         };
 670
 671         return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info);
 672 }
 673
 674 int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
 675                      u16 vid)
 676 {
 677         struct dsa_notifier_fdb_info info = {
 678                 .sw_index = dp->ds->index,
 679                 .port = dp->index,
 680                 .addr = addr,
 681                 .vid = vid,
 682
 683         };
 684
 685         return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info);
 686 }
 687
 688 int dsa_port_host_fdb_add(struct dsa_port *dp, const unsigned char *addr,
 689                           u16 vid)
 690 {
 691         struct dsa_notifier_fdb_info info = {
 692                 .sw_index = dp->ds->index,
 693                 .port = dp->index,
 694                 .addr = addr,
 695                 .vid = vid,
 696         };
 697         struct dsa_port *cpu_dp = dp->cpu_dp;
 698         int err;
 699
 700         err = dev_uc_add(cpu_dp->master, addr);
 701         if (err)
 702                 return err;
 703
 704         return dsa_port_notify(dp, DSA_NOTIFIER_HOST_FDB_ADD, &info);
 705 }
 706
 707 int dsa_port_host_fdb_del(struct dsa_port *dp, const unsigned char *addr,
 708                           u16 vid)
 709 {
 710         struct dsa_notifier_fdb_info info = {
 711                 .sw_index = dp->ds->index,
 712                 .port = dp->index,
 713                 .addr = addr,
 714                 .vid = vid,
 715         };
 716         struct dsa_port *cpu_dp = dp->cpu_dp;
 717         int err;
 718
 719         err = dev_uc_del(cpu_dp->master, addr);
 720         if (err)
 721                 return err;
 722
 723         return dsa_port_notify(dp, DSA_NOTIFIER_HOST_FDB_DEL, &info);
 724 }
 725
 726 int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data)
 727 {
 728         struct dsa_switch *ds = dp->ds;
 729         int port = dp->index;
 730
 731         if (!ds->ops->port_fdb_dump)
 732                 return -EOPNOTSUPP;
 733
 734         return ds->ops->port_fdb_dump(ds, port, cb, data);
 735 }
 736
 737 int dsa_port_mdb_add(const struct dsa_port *dp,
 738                      const struct switchdev_obj_port_mdb *mdb)
 739 {
 740         struct dsa_notifier_mdb_info info = {
 741                 .sw_index = dp->ds->index,
 742                 .port = dp->index,
 743                 .mdb = mdb,
 744         };
 745
 746         return dsa_port_notify(dp, DSA_NOTIFIER_MDB_ADD, &info);
 747 }
 748
 749 int dsa_port_mdb_del(const struct dsa_port *dp,
 750                      const struct switchdev_obj_port_mdb *mdb)
 751 {
 752         struct dsa_notifier_mdb_info info = {
 753                 .sw_index = dp->ds->index,
 754                 .port = dp->index,
 755                 .mdb = mdb,
 756         };
 757
 758         return dsa_port_notify(dp, DSA_NOTIFIER_MDB_DEL, &info);
 759 }
 760
 761 int dsa_port_host_mdb_add(const struct dsa_port *dp,
 762                           const struct switchdev_obj_port_mdb *mdb)
 763 {
 764         struct dsa_notifier_mdb_info info = {
 765                 .sw_index = dp->ds->index,
 766                 .port = dp->index,
 767                 .mdb = mdb,
 768         };
 769         struct dsa_port *cpu_dp = dp->cpu_dp;
 770         int err;
 771
 772         err = dev_mc_add(cpu_dp->master, mdb->addr);
 773         if (err)
 774                 return err;
 775
 776         return dsa_port_notify(dp, DSA_NOTIFIER_HOST_MDB_ADD, &info);
 777 }
 778
 779 int dsa_port_host_mdb_del(const struct dsa_port *dp,
 780                           const struct switchdev_obj_port_mdb *mdb)
 781 {
 782         struct dsa_notifier_mdb_info info = {
 783                 .sw_index = dp->ds->index,
 784                 .port = dp->index,
 785                 .mdb = mdb,
 786         };
 787         struct dsa_port *cpu_dp = dp->cpu_dp;
 788         int err;
 789
 790         err = dev_mc_del(cpu_dp->master, mdb->addr);
 791         if (err)
 792                 return err;
 793
 794         return dsa_port_notify(dp, DSA_NOTIFIER_HOST_MDB_DEL, &info);
 795 }
 796
 797 int dsa_port_vlan_add(struct dsa_port *dp,
 798                       const struct switchdev_obj_port_vlan *vlan,
 799                       struct netlink_ext_ack *extack)
 800 {
 801         struct dsa_notifier_vlan_info info = {
 802                 .sw_index = dp->ds->index,
 803                 .port = dp->index,
 804                 .vlan = vlan,
 805                 .extack = extack,
 806         };
 807
 808         return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);
 809 }
 810
 811 int dsa_port_vlan_del(struct dsa_port *dp,
 812                       const struct switchdev_obj_port_vlan *vlan)
 813 {
 814         struct dsa_notifier_vlan_info info = {
 815                 .sw_index = dp->ds->index,
 816                 .port = dp->index,
 817                 .vlan = vlan,
 818         };
 819
 820         return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);
 821 }
 822
 823 int dsa_port_mrp_add(const struct dsa_port *dp,
 824                      const struct switchdev_obj_mrp *mrp)
 825 {
 826         struct dsa_notifier_mrp_info info = {
 827                 .sw_index = dp->ds->index,
 828                 .port = dp->index,
 829                 .mrp = mrp,
 830         };
 831
 832         return dsa_port_notify(dp, DSA_NOTIFIER_MRP_ADD, &info);
 833 }
 834
 835 int dsa_port_mrp_del(const struct dsa_port *dp,
 836                      const struct switchdev_obj_mrp *mrp)
 837 {
 838         struct dsa_notifier_mrp_info info = {
 839                 .sw_index = dp->ds->index,
 840                 .port = dp->index,
 841                 .mrp = mrp,
 842         };
 843
 844         return dsa_port_notify(dp, DSA_NOTIFIER_MRP_DEL, &info);
 845 }
 846
 847 int dsa_port_mrp_add_ring_role(const struct dsa_port *dp,
 848                                const struct switchdev_obj_ring_role_mrp *mrp)
 849 {
 850         struct dsa_notifier_mrp_ring_role_info info = {
 851                 .sw_index = dp->ds->index,
 852                 .port = dp->index,
 853                 .mrp = mrp,
 854         };
 855
 856         return dsa_port_notify(dp, DSA_NOTIFIER_MRP_ADD_RING_ROLE, &info);
 857 }
 858
 859 int dsa_port_mrp_del_ring_role(const struct dsa_port *dp,
 860                                const struct switchdev_obj_ring_role_mrp *mrp)
 861 {
 862         struct dsa_notifier_mrp_ring_role_info info = {
 863                 .sw_index = dp->ds->index,
 864                 .port = dp->index,
 865                 .mrp = mrp,
 866         };
 867
 868         return dsa_port_notify(dp, DSA_NOTIFIER_MRP_DEL_RING_ROLE, &info);
 869 }
 870
 871 void dsa_port_set_tag_protocol(struct dsa_port *cpu_dp,
 872                                const struct dsa_device_ops *tag_ops)
 873 {
 874         cpu_dp->rcv = tag_ops->rcv;
 875         cpu_dp->tag_ops = tag_ops;
 876 }
 877
 878 static struct phy_device *dsa_port_get_phy_device(struct dsa_port *dp)
 879 {
 880         struct device_node *phy_dn;
 881         struct phy_device *phydev;
 882
 883         phy_dn = of_parse_phandle(dp->dn, "phy-handle", 0);
 884         if (!phy_dn)
 885                 return NULL;
 886
 887         phydev = of_phy_find_device(phy_dn);
 888         if (!phydev) {
 889                 of_node_put(phy_dn);
 890                 return ERR_PTR(-EPROBE_DEFER);
 891         }
 892
 893         of_node_put(phy_dn);
 894         return phydev;
 895 }
 896
 897 static void dsa_port_phylink_validate(struct phylink_config *config,
 898                                       unsigned long *supported,
 899                                       struct phylink_link_state *state)
 900 {
 901         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 902         struct dsa_switch *ds = dp->ds;
 903
 904         if (!ds->ops->phylink_validate)
 905                 return;
 906
 907         ds->ops->phylink_validate(ds, dp->index, supported, state);
 908 }
 909
 910 static void dsa_port_phylink_mac_pcs_get_state(struct phylink_config *config,
 911                                                struct phylink_link_state *state)
 912 {
 913         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 914         struct dsa_switch *ds = dp->ds;
 915         int err;
 916
 917         /* Only called for inband modes */
 918         if (!ds->ops->phylink_mac_link_state) {
 919                 state->link = 0;
 920                 return;
 921         }
 922
 923         err = ds->ops->phylink_mac_link_state(ds, dp->index, state);
 924         if (err < 0) {
 925                 dev_err(ds->dev, "p%d: phylink_mac_link_state() failed: %d\n",
 926                         dp->index, err);
 927                 state->link = 0;
 928         }
 929 }
 930
 931 static void dsa_port_phylink_mac_config(struct phylink_config *config,
 932                                         unsigned int mode,
 933                                         const struct phylink_link_state *state)
 934 {
 935         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 936         struct dsa_switch *ds = dp->ds;
 937
 938         if (!ds->ops->phylink_mac_config)
 939                 return;
 940
 941         ds->ops->phylink_mac_config(ds, dp->index, mode, state);
 942 }
 943
 944 static void dsa_port_phylink_mac_an_restart(struct phylink_config *config)
 945 {
 946         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 947         struct dsa_switch *ds = dp->ds;
 948
 949         if (!ds->ops->phylink_mac_an_restart)
 950                 return;
 951
 952         ds->ops->phylink_mac_an_restart(ds, dp->index);
 953 }
 954
 955 static void dsa_port_phylink_mac_link_down(struct phylink_config *config,
 956                                            unsigned int mode,
 957                                            phy_interface_t interface)
 958 {
 959         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 960         struct phy_device *phydev = NULL;
 961         struct dsa_switch *ds = dp->ds;
 962
 963         if (dsa_is_user_port(ds, dp->index))
 964                 phydev = dp->slave->phydev;
 965
 966         if (!ds->ops->phylink_mac_link_down) {
 967                 if (ds->ops->adjust_link && phydev)
 968                         ds->ops->adjust_link(ds, dp->index, phydev);
 969                 return;
 970         }
 971
 972         ds->ops->phylink_mac_link_down(ds, dp->index, mode, interface);
 973 }
 974
 975 static void dsa_port_phylink_mac_link_up(struct phylink_config *config,
 976                                          struct phy_device *phydev,
 977                                          unsigned int mode,
 978                                          phy_interface_t interface,
 979                                          int speed, int duplex,
 980                                          bool tx_pause, bool rx_pause)
 981 {
 982         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 983         struct dsa_switch *ds = dp->ds;
 984
 985         if (!ds->ops->phylink_mac_link_up) {
 986                 if (ds->ops->adjust_link && phydev)
 987                         ds->ops->adjust_link(ds, dp->index, phydev);
 988                 return;
 989         }
 990
 991         ds->ops->phylink_mac_link_up(ds, dp->index, mode, interface, phydev,
 992                                      speed, duplex, tx_pause, rx_pause);
 993 }
 994
 995 const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
 996         .validate = dsa_port_phylink_validate,
 997         .mac_pcs_get_state = dsa_port_phylink_mac_pcs_get_state,
 998         .mac_config = dsa_port_phylink_mac_config,
 999         .mac_an_restart = dsa_port_phylink_mac_an_restart,
1000         .mac_link_down = dsa_port_phylink_mac_link_down,
1001         .mac_link_up = dsa_port_phylink_mac_link_up,
1002 };
1003
1004 static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
1005 {
1006         struct dsa_switch *ds = dp->ds;
1007         struct phy_device *phydev;
1008         int port = dp->index;
1009         int err = 0;
1010
1011         phydev = dsa_port_get_phy_device(dp);
1012         if (!phydev)
1013                 return 0;
1014
1015         if (IS_ERR(phydev))
1016                 return PTR_ERR(phydev);
1017
1018         if (enable) {
1019                 err = genphy_resume(phydev);
1020                 if (err < 0)
1021                         goto err_put_dev;
1022
1023                 err = genphy_read_status(phydev);
1024                 if (err < 0)
1025                         goto err_put_dev;
1026         } else {
1027                 err = genphy_suspend(phydev);
1028                 if (err < 0)
1029                         goto err_put_dev;
1030         }
1031
1032         if (ds->ops->adjust_link)
1033                 ds->ops->adjust_link(ds, port, phydev);
1034
1035         dev_dbg(ds->dev, "enabled port's phy: %s", phydev_name(phydev));
1036
1037 err_put_dev:
1038         put_device(&phydev->mdio.dev);
1039         return err;
1040 }
1041
1042 static int dsa_port_fixed_link_register_of(struct dsa_port *dp)
1043 {
1044         struct device_node *dn = dp->dn;
1045         struct dsa_switch *ds = dp->ds;
1046         struct phy_device *phydev;
1047         int port = dp->index;
1048         phy_interface_t mode;
1049         int err;
1050
1051         err = of_phy_register_fixed_link(dn);
1052         if (err) {
1053                 dev_err(ds->dev,
1054                         "failed to register the fixed PHY of port %d\n",
1055                         port);
1056                 return err;
1057         }
1058
1059         phydev = of_phy_find_device(dn);
1060
1061         err = of_get_phy_mode(dn, &mode);
1062         if (err)
1063                 mode = PHY_INTERFACE_MODE_NA;
1064         phydev->interface = mode;
1065
1066         genphy_read_status(phydev);
1067
1068         if (ds->ops->adjust_link)
1069                 ds->ops->adjust_link(ds, port, phydev);
1070
1071         put_device(&phydev->mdio.dev);
1072
1073         return 0;
1074 }
1075
1076 static int dsa_port_phylink_register(struct dsa_port *dp)
1077 {
1078         struct dsa_switch *ds = dp->ds;
1079         struct device_node *port_dn = dp->dn;
1080         phy_interface_t mode;
1081         int err;
1082
1083         err = of_get_phy_mode(port_dn, &mode);
1084         if (err)
1085                 mode = PHY_INTERFACE_MODE_NA;
1086
1087         dp->pl_config.dev = ds->dev;
1088         dp->pl_config.type = PHYLINK_DEV;
1089         dp->pl_config.pcs_poll = ds->pcs_poll;
1090
1091         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn),
1092                                 mode, &dsa_port_phylink_mac_ops);
1093         if (IS_ERR(dp->pl)) {
1094                 pr_err("error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1095                 return PTR_ERR(dp->pl);
1096         }
1097
1098         err = phylink_of_phy_connect(dp->pl, port_dn, 0);
1099         if (err && err != -ENODEV) {
1100                 pr_err("could not attach to PHY: %d\n", err);
1101                 goto err_phy_connect;
1102         }
1103
1104         return 0;
1105
1106 err_phy_connect:
1107         phylink_destroy(dp->pl);
1108         return err;
1109 }
1110
1111 int dsa_port_link_register_of(struct dsa_port *dp)
1112 {
1113         struct dsa_switch *ds = dp->ds;
1114         struct device_node *phy_np;
1115         int port = dp->index;
1116
1117         if (!ds->ops->adjust_link) {
1118                 phy_np = of_parse_phandle(dp->dn, "phy-handle", 0);
1119                 if (of_phy_is_fixed_link(dp->dn) || phy_np) {
1120                         if (ds->ops->phylink_mac_link_down)
1121                                 ds->ops->phylink_mac_link_down(ds, port,
1122                                         MLO_AN_FIXED, PHY_INTERFACE_MODE_NA);
1123                         return dsa_port_phylink_register(dp);
1124                 }
1125                 return 0;
1126         }
1127
1128         dev_warn(ds->dev,
1129                  "Using legacy PHYLIB callbacks. Please migrate to PHYLINK!\n");
1130
1131         if (of_phy_is_fixed_link(dp->dn))
1132                 return dsa_port_fixed_link_register_of(dp);
1133         else
1134                 return dsa_port_setup_phy_of(dp, true);
1135 }
1136
1137 void dsa_port_link_unregister_of(struct dsa_port *dp)
1138 {
1139         struct dsa_switch *ds = dp->ds;
1140
1141         if (!ds->ops->adjust_link && dp->pl) {
1142                 rtnl_lock();
1143                 phylink_disconnect_phy(dp->pl);
1144                 rtnl_unlock();
1145                 phylink_destroy(dp->pl);
1146                 dp->pl = NULL;
1147                 return;
1148         }
1149
1150         if (of_phy_is_fixed_link(dp->dn))
1151                 of_phy_deregister_fixed_link(dp->dn);
1152         else
1153                 dsa_port_setup_phy_of(dp, false);
1154 }
1155
1156 int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data)
1157 {
1158         struct phy_device *phydev;
1159         int ret = -EOPNOTSUPP;
1160
1161         if (of_phy_is_fixed_link(dp->dn))
1162                 return ret;
1163
1164         phydev = dsa_port_get_phy_device(dp);
1165         if (IS_ERR_OR_NULL(phydev))
1166                 return ret;
1167
1168         ret = phy_ethtool_get_strings(phydev, data);
1169         put_device(&phydev->mdio.dev);
1170
1171         return ret;
1172 }
1173 EXPORT_SYMBOL_GPL(dsa_port_get_phy_strings);
1174
1175 int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data)
1176 {
1177         struct phy_device *phydev;
1178         int ret = -EOPNOTSUPP;
1179
1180         if (of_phy_is_fixed_link(dp->dn))
1181                 return ret;
1182
1183         phydev = dsa_port_get_phy_device(dp);
1184         if (IS_ERR_OR_NULL(phydev))
1185                 return ret;
1186
1187         ret = phy_ethtool_get_stats(phydev, NULL, data);
1188         put_device(&phydev->mdio.dev);
1189
1190         return ret;
1191 }
1192 EXPORT_SYMBOL_GPL(dsa_port_get_ethtool_phy_stats);
1193
1194 int dsa_port_get_phy_sset_count(struct dsa_port *dp)
1195 {
1196         struct phy_device *phydev;
1197         int ret = -EOPNOTSUPP;
1198
1199         if (of_phy_is_fixed_link(dp->dn))
1200                 return ret;
1201
1202         phydev = dsa_port_get_phy_device(dp);
1203         if (IS_ERR_OR_NULL(phydev))
1204                 return ret;
1205
1206         ret = phy_ethtool_get_sset_count(phydev);
1207         put_device(&phydev->mdio.dev);
1208
1209         return ret;
1210 }
1211 EXPORT_SYMBOL_GPL(dsa_port_get_phy_sset_count);
1212
1213 int dsa_port_hsr_join(struct dsa_port *dp, struct net_device *hsr)
1214 {
1215         struct dsa_notifier_hsr_info info = {
1216                 .sw_index = dp->ds->index,
1217                 .port = dp->index,
1218                 .hsr = hsr,
1219         };
1220         int err;
1221
1222         dp->hsr_dev = hsr;
1223
1224         err = dsa_port_notify(dp, DSA_NOTIFIER_HSR_JOIN, &info);
1225         if (err)
1226                 dp->hsr_dev = NULL;
1227
1228         return err;
1229 }
1230
1231 void dsa_port_hsr_leave(struct dsa_port *dp, struct net_device *hsr)
1232 {
1233         struct dsa_notifier_hsr_info info = {
1234                 .sw_index = dp->ds->index,
1235                 .port = dp->index,
1236                 .hsr = hsr,
1237         };
1238         int err;
1239
1240         dp->hsr_dev = NULL;
1241
1242         err = dsa_port_notify(dp, DSA_NOTIFIER_HSR_LEAVE, &info);
1243         if (err)
1244                 pr_err("DSA: failed to notify DSA_NOTIFIER_HSR_LEAVE\n");
1245 }
1246
1247 int dsa_port_tag_8021q_vlan_add(struct dsa_port *dp, u16 vid)
1248 {
1249         struct dsa_notifier_tag_8021q_vlan_info info = {
1250                 .tree_index = dp->ds->dst->index,
1251                 .sw_index = dp->ds->index,
1252                 .port = dp->index,
1253                 .vid = vid,
1254         };
1255
1256         return dsa_broadcast(DSA_NOTIFIER_TAG_8021Q_VLAN_ADD, &info);
1257 }
1258
1259 void dsa_port_tag_8021q_vlan_del(struct dsa_port *dp, u16 vid)
1260 {
1261         struct dsa_notifier_tag_8021q_vlan_info info = {
1262                 .tree_index = dp->ds->dst->index,
1263                 .sw_index = dp->ds->index,
1264                 .port = dp->index,
1265                 .vid = vid,
1266         };
1267         int err;
1268
1269         err = dsa_broadcast(DSA_NOTIFIER_TAG_8021Q_VLAN_DEL, &info);
1270         if (err)
1271                 pr_err("DSA: failed to notify tag_8021q VLAN deletion: %pe\n",
1272                        ERR_PTR(err));
1273 }