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 static int dsa_port_notify(const struct dsa_port *dp, unsigned long e, void *v)
  17 {
  18         struct raw_notifier_head *nh = &dp->ds->dst->nh;
  19         int err;
  20
  21         err = raw_notifier_call_chain(nh, e, v);
  22
  23         return notifier_to_errno(err);
  24 }
  25
  26 int dsa_port_set_state(struct dsa_port *dp, u8 state,
  27                        struct switchdev_trans *trans)
  28 {
  29         struct dsa_switch *ds = dp->ds;
  30         int port = dp->index;
  31
  32         if (switchdev_trans_ph_prepare(trans))
  33                 return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;
  34
  35         if (ds->ops->port_stp_state_set)
  36                 ds->ops->port_stp_state_set(ds, port, state);
  37
  38         if (ds->ops->port_fast_age) {
  39                 /* Fast age FDB entries or flush appropriate forwarding database
  40                  * for the given port, if we are moving it from Learning or
  41                  * Forwarding state, to Disabled or Blocking or Listening state.
  42                  */
  43
  44                 if ((dp->stp_state == BR_STATE_LEARNING ||
  45                      dp->stp_state == BR_STATE_FORWARDING) &&
  46                     (state == BR_STATE_DISABLED ||
  47                      state == BR_STATE_BLOCKING ||
  48                      state == BR_STATE_LISTENING))
  49                         ds->ops->port_fast_age(ds, port);
  50         }
  51
  52         dp->stp_state = state;
  53
  54         return 0;
  55 }
  56
  57 static void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
  58 {
  59         int err;
  60
  61         err = dsa_port_set_state(dp, state, NULL);
  62         if (err)
  63                 pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
  64 }
  65
  66 int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
  67 {
  68         struct dsa_switch *ds = dp->ds;
  69         int port = dp->index;
  70         int err;
  71
  72         if (ds->ops->port_enable) {
  73                 err = ds->ops->port_enable(ds, port, phy);
  74                 if (err)
  75                         return err;
  76         }
  77
  78         if (!dp->bridge_dev)
  79                 dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
  80
  81         return 0;
  82 }
  83
  84 void dsa_port_disable(struct dsa_port *dp)
  85 {
  86         struct dsa_switch *ds = dp->ds;
  87         int port = dp->index;
  88
  89         if (!dp->bridge_dev)
  90                 dsa_port_set_state_now(dp, BR_STATE_DISABLED);
  91
  92         if (ds->ops->port_disable)
  93                 ds->ops->port_disable(ds, port);
  94 }
  95
  96 int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br)
  97 {
  98         struct dsa_notifier_bridge_info info = {
  99                 .sw_index = dp->ds->index,
 100                 .port = dp->index,
 101                 .br = br,
 102         };
 103         int err;
 104
 105         /* Set the flooding mode before joining the port in the switch */
 106         err = dsa_port_bridge_flags(dp, BR_FLOOD | BR_MCAST_FLOOD, NULL);
 107         if (err)
 108                 return err;
 109
 110         /* Here the interface is already bridged. Reflect the current
 111          * configuration so that drivers can program their chips accordingly.
 112          */
 113         dp->bridge_dev = br;
 114
 115         err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info);
 116
 117         /* The bridging is rolled back on error */
 118         if (err) {
 119                 dsa_port_bridge_flags(dp, 0, NULL);
 120                 dp->bridge_dev = NULL;
 121         }
 122
 123         return err;
 124 }
 125
 126 void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
 127 {
 128         struct dsa_notifier_bridge_info info = {
 129                 .sw_index = dp->ds->index,
 130                 .port = dp->index,
 131                 .br = br,
 132         };
 133         int err;
 134
 135         /* Here the port is already unbridged. Reflect the current configuration
 136          * so that drivers can program their chips accordingly.
 137          */
 138         dp->bridge_dev = NULL;
 139
 140         err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info);
 141         if (err)
 142                 pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
 143
 144         /* Port is leaving the bridge, disable flooding */
 145         dsa_port_bridge_flags(dp, 0, NULL);
 146
 147         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 148          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 149          */
 150         dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
 151 }
 152
 153 static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp,
 154                                               bool vlan_filtering)
 155 {
 156         struct dsa_switch *ds = dp->ds;
 157         int i;
 158
 159         if (!ds->vlan_filtering_is_global)
 160                 return true;
 161
 162         /* For cases where enabling/disabling VLAN awareness is global to the
 163          * switch, we need to handle the case where multiple bridges span
 164          * different ports of the same switch device and one of them has a
 165          * different setting than what is being requested.
 166          */
 167         for (i = 0; i < ds->num_ports; i++) {
 168                 struct net_device *other_bridge;
 169
 170                 other_bridge = dsa_to_port(ds, i)->bridge_dev;
 171                 if (!other_bridge)
 172                         continue;
 173                 /* If it's the same bridge, it also has same
 174                  * vlan_filtering setting => no need to check
 175                  */
 176                 if (other_bridge == dp->bridge_dev)
 177                         continue;
 178                 if (br_vlan_enabled(other_bridge) != vlan_filtering) {
 179                         dev_err(ds->dev, "VLAN filtering is a global setting\n");
 180                         return false;
 181                 }
 182         }
 183         return true;
 184 }
 185
 186 int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
 187                             struct switchdev_trans *trans)
 188 {
 189         struct dsa_switch *ds = dp->ds;
 190         int err;
 191
 192         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 193         if (switchdev_trans_ph_prepare(trans))
 194                 return 0;
 195
 196         if (!ds->ops->port_vlan_filtering)
 197                 return 0;
 198
 199         if (!dsa_port_can_apply_vlan_filtering(dp, vlan_filtering))
 200                 return -EINVAL;
 201
 202         if (dsa_port_is_vlan_filtering(dp) == vlan_filtering)
 203                 return 0;
 204
 205         err = ds->ops->port_vlan_filtering(ds, dp->index,
 206                                            vlan_filtering);
 207         if (err)
 208                 return err;
 209
 210         if (ds->vlan_filtering_is_global)
 211                 ds->vlan_filtering = vlan_filtering;
 212         else
 213                 dp->vlan_filtering = vlan_filtering;
 214         return 0;
 215 }
 216
 217 int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
 218                          struct switchdev_trans *trans)
 219 {
 220         unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
 221         unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
 222         struct dsa_notifier_ageing_time_info info = {
 223                 .ageing_time = ageing_time,
 224                 .trans = trans,
 225         };
 226
 227         if (switchdev_trans_ph_prepare(trans))
 228                 return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
 229
 230         dp->ageing_time = ageing_time;
 231
 232         return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
 233 }
 234
 235 int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags,
 236                               struct switchdev_trans *trans)
 237 {
 238         struct dsa_switch *ds = dp->ds;
 239
 240         if (!ds->ops->port_egress_floods ||
 241             (flags & ~(BR_FLOOD | BR_MCAST_FLOOD)))
 242                 return -EINVAL;
 243
 244         return 0;
 245 }
 246
 247 int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
 248                           struct switchdev_trans *trans)
 249 {
 250         struct dsa_switch *ds = dp->ds;
 251         int port = dp->index;
 252         int err = 0;
 253
 254         if (switchdev_trans_ph_prepare(trans))
 255                 return 0;
 256
 257         if (ds->ops->port_egress_floods)
 258                 err = ds->ops->port_egress_floods(ds, port, flags & BR_FLOOD,
 259                                                   flags & BR_MCAST_FLOOD);
 260
 261         return err;
 262 }
 263
 264 int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
 265                      struct switchdev_trans *trans)
 266 {
 267         struct dsa_switch *ds = dp->ds;
 268         int port = dp->index;
 269
 270         if (switchdev_trans_ph_prepare(trans))
 271                 return ds->ops->port_egress_floods ? 0 : -EOPNOTSUPP;
 272
 273         return ds->ops->port_egress_floods(ds, port, true, mrouter);
 274 }
 275
 276 int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
 277                      u16 vid)
 278 {
 279         struct dsa_notifier_fdb_info info = {
 280                 .sw_index = dp->ds->index,
 281                 .port = dp->index,
 282                 .addr = addr,
 283                 .vid = vid,
 284         };
 285
 286         return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info);
 287 }
 288
 289 int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
 290                      u16 vid)
 291 {
 292         struct dsa_notifier_fdb_info info = {
 293                 .sw_index = dp->ds->index,
 294                 .port = dp->index,
 295                 .addr = addr,
 296                 .vid = vid,
 297
 298         };
 299
 300         return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info);
 301 }
 302
 303 int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data)
 304 {
 305         struct dsa_switch *ds = dp->ds;
 306         int port = dp->index;
 307
 308         if (!ds->ops->port_fdb_dump)
 309                 return -EOPNOTSUPP;
 310
 311         return ds->ops->port_fdb_dump(ds, port, cb, data);
 312 }
 313
 314 int dsa_port_mdb_add(const struct dsa_port *dp,
 315                      const struct switchdev_obj_port_mdb *mdb,
 316                      struct switchdev_trans *trans)
 317 {
 318         struct dsa_notifier_mdb_info info = {
 319                 .sw_index = dp->ds->index,
 320                 .port = dp->index,
 321                 .trans = trans,
 322                 .mdb = mdb,
 323         };
 324
 325         return dsa_port_notify(dp, DSA_NOTIFIER_MDB_ADD, &info);
 326 }
 327
 328 int dsa_port_mdb_del(const struct dsa_port *dp,
 329                      const struct switchdev_obj_port_mdb *mdb)
 330 {
 331         struct dsa_notifier_mdb_info info = {
 332                 .sw_index = dp->ds->index,
 333                 .port = dp->index,
 334                 .mdb = mdb,
 335         };
 336
 337         return dsa_port_notify(dp, DSA_NOTIFIER_MDB_DEL, &info);
 338 }
 339
 340 int dsa_port_vlan_add(struct dsa_port *dp,
 341                       const struct switchdev_obj_port_vlan *vlan,
 342                       struct switchdev_trans *trans)
 343 {
 344         struct dsa_notifier_vlan_info info = {
 345                 .sw_index = dp->ds->index,
 346                 .port = dp->index,
 347                 .trans = trans,
 348                 .vlan = vlan,
 349         };
 350
 351         return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);
 352 }
 353
 354 int dsa_port_vlan_del(struct dsa_port *dp,
 355                       const struct switchdev_obj_port_vlan *vlan)
 356 {
 357         struct dsa_notifier_vlan_info info = {
 358                 .sw_index = dp->ds->index,
 359                 .port = dp->index,
 360                 .vlan = vlan,
 361         };
 362
 363         return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);
 364 }
 365
 366 int dsa_port_vid_add(struct dsa_port *dp, u16 vid, u16 flags)
 367 {
 368         struct switchdev_obj_port_vlan vlan = {
 369                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 370                 .flags = flags,
 371                 .vid_begin = vid,
 372                 .vid_end = vid,
 373         };
 374         struct switchdev_trans trans;
 375         int err;
 376
 377         trans.ph_prepare = true;
 378         err = dsa_port_vlan_add(dp, &vlan, &trans);
 379         if (err)
 380                 return err;
 381
 382         trans.ph_prepare = false;
 383         return dsa_port_vlan_add(dp, &vlan, &trans);
 384 }
 385 EXPORT_SYMBOL(dsa_port_vid_add);
 386
 387 int dsa_port_vid_del(struct dsa_port *dp, u16 vid)
 388 {
 389         struct switchdev_obj_port_vlan vlan = {
 390                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 391                 .vid_begin = vid,
 392                 .vid_end = vid,
 393         };
 394
 395         return dsa_port_vlan_del(dp, &vlan);
 396 }
 397 EXPORT_SYMBOL(dsa_port_vid_del);
 398
 399 static struct phy_device *dsa_port_get_phy_device(struct dsa_port *dp)
 400 {
 401         struct device_node *phy_dn;
 402         struct phy_device *phydev;
 403
 404         phy_dn = of_parse_phandle(dp->dn, "phy-handle", 0);
 405         if (!phy_dn)
 406                 return NULL;
 407
 408         phydev = of_phy_find_device(phy_dn);
 409         if (!phydev) {
 410                 of_node_put(phy_dn);
 411                 return ERR_PTR(-EPROBE_DEFER);
 412         }
 413
 414         of_node_put(phy_dn);
 415         return phydev;
 416 }
 417
 418 void dsa_port_phylink_validate(struct phylink_config *config,
 419                                unsigned long *supported,
 420                                struct phylink_link_state *state)
 421 {
 422         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 423         struct dsa_switch *ds = dp->ds;
 424
 425         if (!ds->ops->phylink_validate)
 426                 return;
 427
 428         ds->ops->phylink_validate(ds, dp->index, supported, state);
 429 }
 430 EXPORT_SYMBOL_GPL(dsa_port_phylink_validate);
 431
 432 void dsa_port_phylink_mac_pcs_get_state(struct phylink_config *config,
 433                                         struct phylink_link_state *state)
 434 {
 435         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 436         struct dsa_switch *ds = dp->ds;
 437
 438         /* Only called for inband modes */
 439         if (!ds->ops->phylink_mac_link_state) {
 440                 state->link = 0;
 441                 return;
 442         }
 443
 444         if (ds->ops->phylink_mac_link_state(ds, dp->index, state) < 0)
 445                 state->link = 0;
 446 }
 447 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_pcs_get_state);
 448
 449 void dsa_port_phylink_mac_config(struct phylink_config *config,
 450                                  unsigned int mode,
 451                                  const struct phylink_link_state *state)
 452 {
 453         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 454         struct dsa_switch *ds = dp->ds;
 455
 456         if (!ds->ops->phylink_mac_config)
 457                 return;
 458
 459         ds->ops->phylink_mac_config(ds, dp->index, mode, state);
 460 }
 461 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_config);
 462
 463 void dsa_port_phylink_mac_an_restart(struct phylink_config *config)
 464 {
 465         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 466         struct dsa_switch *ds = dp->ds;
 467
 468         if (!ds->ops->phylink_mac_an_restart)
 469                 return;
 470
 471         ds->ops->phylink_mac_an_restart(ds, dp->index);
 472 }
 473 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_an_restart);
 474
 475 void dsa_port_phylink_mac_link_down(struct phylink_config *config,
 476                                     unsigned int mode,
 477                                     phy_interface_t interface)
 478 {
 479         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 480         struct phy_device *phydev = NULL;
 481         struct dsa_switch *ds = dp->ds;
 482
 483         if (dsa_is_user_port(ds, dp->index))
 484                 phydev = dp->slave->phydev;
 485
 486         if (!ds->ops->phylink_mac_link_down) {
 487                 if (ds->ops->adjust_link && phydev)
 488                         ds->ops->adjust_link(ds, dp->index, phydev);
 489                 return;
 490         }
 491
 492         ds->ops->phylink_mac_link_down(ds, dp->index, mode, interface);
 493 }
 494 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_link_down);
 495
 496 void dsa_port_phylink_mac_link_up(struct phylink_config *config,
 497                                   unsigned int mode,
 498                                   phy_interface_t interface,
 499                                   struct phy_device *phydev)
 500 {
 501         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
 502         struct dsa_switch *ds = dp->ds;
 503
 504         if (!ds->ops->phylink_mac_link_up) {
 505                 if (ds->ops->adjust_link && phydev)
 506                         ds->ops->adjust_link(ds, dp->index, phydev);
 507                 return;
 508         }
 509
 510         ds->ops->phylink_mac_link_up(ds, dp->index, mode, interface, phydev);
 511 }
 512 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_link_up);
 513
 514 const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
 515         .validate = dsa_port_phylink_validate,
 516         .mac_pcs_get_state = dsa_port_phylink_mac_pcs_get_state,
 517         .mac_config = dsa_port_phylink_mac_config,
 518         .mac_an_restart = dsa_port_phylink_mac_an_restart,
 519         .mac_link_down = dsa_port_phylink_mac_link_down,
 520         .mac_link_up = dsa_port_phylink_mac_link_up,
 521 };
 522
 523 static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
 524 {
 525         struct dsa_switch *ds = dp->ds;
 526         struct phy_device *phydev;
 527         int port = dp->index;
 528         int err = 0;
 529
 530         phydev = dsa_port_get_phy_device(dp);
 531         if (!phydev)
 532                 return 0;
 533
 534         if (IS_ERR(phydev))
 535                 return PTR_ERR(phydev);
 536
 537         if (enable) {
 538                 err = genphy_resume(phydev);
 539                 if (err < 0)
 540                         goto err_put_dev;
 541
 542                 err = genphy_read_status(phydev);
 543                 if (err < 0)
 544                         goto err_put_dev;
 545         } else {
 546                 err = genphy_suspend(phydev);
 547                 if (err < 0)
 548                         goto err_put_dev;
 549         }
 550
 551         if (ds->ops->adjust_link)
 552                 ds->ops->adjust_link(ds, port, phydev);
 553
 554         dev_dbg(ds->dev, "enabled port's phy: %s", phydev_name(phydev));
 555
 556 err_put_dev:
 557         put_device(&phydev->mdio.dev);
 558         return err;
 559 }
 560
 561 static int dsa_port_fixed_link_register_of(struct dsa_port *dp)
 562 {
 563         struct device_node *dn = dp->dn;
 564         struct dsa_switch *ds = dp->ds;
 565         struct phy_device *phydev;
 566         int port = dp->index;
 567         phy_interface_t mode;
 568         int err;
 569
 570         err = of_phy_register_fixed_link(dn);
 571         if (err) {
 572                 dev_err(ds->dev,
 573                         "failed to register the fixed PHY of port %d\n",
 574                         port);
 575                 return err;
 576         }
 577
 578         phydev = of_phy_find_device(dn);
 579
 580         err = of_get_phy_mode(dn, &mode);
 581         if (err)
 582                 mode = PHY_INTERFACE_MODE_NA;
 583         phydev->interface = mode;
 584
 585         genphy_read_status(phydev);
 586
 587         if (ds->ops->adjust_link)
 588                 ds->ops->adjust_link(ds, port, phydev);
 589
 590         put_device(&phydev->mdio.dev);
 591
 592         return 0;
 593 }
 594
 595 static int dsa_port_phylink_register(struct dsa_port *dp)
 596 {
 597         struct dsa_switch *ds = dp->ds;
 598         struct device_node *port_dn = dp->dn;
 599         phy_interface_t mode;
 600         int err;
 601
 602         err = of_get_phy_mode(port_dn, &mode);
 603         if (err)
 604                 mode = PHY_INTERFACE_MODE_NA;
 605
 606         dp->pl_config.dev = ds->dev;
 607         dp->pl_config.type = PHYLINK_DEV;
 608
 609         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn),
 610                                 mode, &dsa_port_phylink_mac_ops);
 611         if (IS_ERR(dp->pl)) {
 612                 pr_err("error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
 613                 return PTR_ERR(dp->pl);
 614         }
 615
 616         err = phylink_of_phy_connect(dp->pl, port_dn, 0);
 617         if (err && err != -ENODEV) {
 618                 pr_err("could not attach to PHY: %d\n", err);
 619                 goto err_phy_connect;
 620         }
 621
 622         rtnl_lock();
 623         phylink_start(dp->pl);
 624         rtnl_unlock();
 625
 626         return 0;
 627
 628 err_phy_connect:
 629         phylink_destroy(dp->pl);
 630         return err;
 631 }
 632
 633 int dsa_port_link_register_of(struct dsa_port *dp)
 634 {
 635         struct dsa_switch *ds = dp->ds;
 636
 637         if (!ds->ops->adjust_link)
 638                 return dsa_port_phylink_register(dp);
 639
 640         dev_warn(ds->dev,
 641                  "Using legacy PHYLIB callbacks. Please migrate to PHYLINK!\n");
 642
 643         if (of_phy_is_fixed_link(dp->dn))
 644                 return dsa_port_fixed_link_register_of(dp);
 645         else
 646                 return dsa_port_setup_phy_of(dp, true);
 647 }
 648
 649 void dsa_port_link_unregister_of(struct dsa_port *dp)
 650 {
 651         struct dsa_switch *ds = dp->ds;
 652
 653         if (!ds->ops->adjust_link) {
 654                 rtnl_lock();
 655                 phylink_disconnect_phy(dp->pl);
 656                 rtnl_unlock();
 657                 phylink_destroy(dp->pl);
 658                 return;
 659         }
 660
 661         if (of_phy_is_fixed_link(dp->dn))
 662                 of_phy_deregister_fixed_link(dp->dn);
 663         else
 664                 dsa_port_setup_phy_of(dp, false);
 665 }
 666
 667 int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data)
 668 {
 669         struct phy_device *phydev;
 670         int ret = -EOPNOTSUPP;
 671
 672         if (of_phy_is_fixed_link(dp->dn))
 673                 return ret;
 674
 675         phydev = dsa_port_get_phy_device(dp);
 676         if (IS_ERR_OR_NULL(phydev))
 677                 return ret;
 678
 679         ret = phy_ethtool_get_strings(phydev, data);
 680         put_device(&phydev->mdio.dev);
 681
 682         return ret;
 683 }
 684 EXPORT_SYMBOL_GPL(dsa_port_get_phy_strings);
 685
 686 int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data)
 687 {
 688         struct phy_device *phydev;
 689         int ret = -EOPNOTSUPP;
 690
 691         if (of_phy_is_fixed_link(dp->dn))
 692                 return ret;
 693
 694         phydev = dsa_port_get_phy_device(dp);
 695         if (IS_ERR_OR_NULL(phydev))
 696                 return ret;
 697
 698         ret = phy_ethtool_get_stats(phydev, NULL, data);
 699         put_device(&phydev->mdio.dev);
 700
 701         return ret;
 702 }
 703 EXPORT_SYMBOL_GPL(dsa_port_get_ethtool_phy_stats);
 704
 705 int dsa_port_get_phy_sset_count(struct dsa_port *dp)
 706 {
 707         struct phy_device *phydev;
 708         int ret = -EOPNOTSUPP;
 709
 710         if (of_phy_is_fixed_link(dp->dn))
 711                 return ret;
 712
 713         phydev = dsa_port_get_phy_device(dp);
 714         if (IS_ERR_OR_NULL(phydev))
 715                 return ret;
 716
 717         ret = phy_ethtool_get_sset_count(phydev);
 718         put_device(&phydev->mdio.dev);
 719
 720         return ret;
 721 }
 722 EXPORT_SYMBOL_GPL(dsa_port_get_phy_sset_count);