net/dsa/slave.c

   1 /*
   2  * net/dsa/slave.c - Slave device handling
   3  * Copyright (c) 2008-2009 Marvell Semiconductor
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/list.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/phy.h>
  15 #include <linux/phy_fixed.h>
  16 #include <linux/of_net.h>
  17 #include <linux/of_mdio.h>
  18 #include <linux/mdio.h>
  19 #include <net/rtnetlink.h>
  20 #include <net/switchdev.h>
  21 #include <linux/if_bridge.h>
  22 #include <linux/netpoll.h>
  23 #include "dsa_priv.h"
  24
  25 /* slave mii_bus handling ***************************************************/
  26 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  27 {
  28         struct dsa_switch *ds = bus->priv;
  29
  30         if (ds->phys_mii_mask & (1 << addr))
  31                 return ds->ops->phy_read(ds, addr, reg);
  32
  33         return 0xffff;
  34 }
  35
  36 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  37 {
  38         struct dsa_switch *ds = bus->priv;
  39
  40         if (ds->phys_mii_mask & (1 << addr))
  41                 return ds->ops->phy_write(ds, addr, reg, val);
  42
  43         return 0;
  44 }
  45
  46 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  47 {
  48         ds->slave_mii_bus->priv = (void *)ds;
  49         ds->slave_mii_bus->name = "dsa slave smi";
  50         ds->slave_mii_bus->read = dsa_slave_phy_read;
  51         ds->slave_mii_bus->write = dsa_slave_phy_write;
  52         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  53                  ds->dst->tree, ds->index);
  54         ds->slave_mii_bus->parent = ds->dev;
  55         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  56 }
  57
  58
  59 /* slave device handling ****************************************************/
  60 static int dsa_slave_get_iflink(const struct net_device *dev)
  61 {
  62         struct dsa_slave_priv *p = netdev_priv(dev);
  63
  64         return p->parent->dst->master_netdev->ifindex;
  65 }
  66
  67 static inline bool dsa_port_is_bridged(struct dsa_slave_priv *p)
  68 {
  69         return !!p->bridge_dev;
  70 }
  71
  72 static void dsa_port_set_stp_state(struct dsa_switch *ds, int port, u8 state)
  73 {
  74         struct dsa_port *dp = &ds->ports[port];
  75
  76         if (ds->ops->port_stp_state_set)
  77                 ds->ops->port_stp_state_set(ds, port, state);
  78
  79         if (ds->ops->port_fast_age) {
  80                 /* Fast age FDB entries or flush appropriate forwarding database
  81                  * for the given port, if we are moving it from Learning or
  82                  * Forwarding state, to Disabled or Blocking or Listening state.
  83                  */
  84
  85                 if ((dp->stp_state == BR_STATE_LEARNING ||
  86                      dp->stp_state == BR_STATE_FORWARDING) &&
  87                     (state == BR_STATE_DISABLED ||
  88                      state == BR_STATE_BLOCKING ||
  89                      state == BR_STATE_LISTENING))
  90                         ds->ops->port_fast_age(ds, port);
  91         }
  92
  93         dp->stp_state = state;
  94 }
  95
  96 static int dsa_slave_open(struct net_device *dev)
  97 {
  98         struct dsa_slave_priv *p = netdev_priv(dev);
  99         struct net_device *master = p->parent->dst->master_netdev;
 100         struct dsa_switch *ds = p->parent;
 101         u8 stp_state = dsa_port_is_bridged(p) ?
 102                         BR_STATE_BLOCKING : BR_STATE_FORWARDING;
 103         int err;
 104
 105         if (!(master->flags & IFF_UP))
 106                 return -ENETDOWN;
 107
 108         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
 109                 err = dev_uc_add(master, dev->dev_addr);
 110                 if (err < 0)
 111                         goto out;
 112         }
 113
 114         if (dev->flags & IFF_ALLMULTI) {
 115                 err = dev_set_allmulti(master, 1);
 116                 if (err < 0)
 117                         goto del_unicast;
 118         }
 119         if (dev->flags & IFF_PROMISC) {
 120                 err = dev_set_promiscuity(master, 1);
 121                 if (err < 0)
 122                         goto clear_allmulti;
 123         }
 124
 125         if (ds->ops->port_enable) {
 126                 err = ds->ops->port_enable(ds, p->port, p->phy);
 127                 if (err)
 128                         goto clear_promisc;
 129         }
 130
 131         dsa_port_set_stp_state(ds, p->port, stp_state);
 132
 133         if (p->phy)
 134                 phy_start(p->phy);
 135
 136         return 0;
 137
 138 clear_promisc:
 139         if (dev->flags & IFF_PROMISC)
 140                 dev_set_promiscuity(master, -1);
 141 clear_allmulti:
 142         if (dev->flags & IFF_ALLMULTI)
 143                 dev_set_allmulti(master, -1);
 144 del_unicast:
 145         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 146                 dev_uc_del(master, dev->dev_addr);
 147 out:
 148         return err;
 149 }
 150
 151 static int dsa_slave_close(struct net_device *dev)
 152 {
 153         struct dsa_slave_priv *p = netdev_priv(dev);
 154         struct net_device *master = p->parent->dst->master_netdev;
 155         struct dsa_switch *ds = p->parent;
 156
 157         if (p->phy)
 158                 phy_stop(p->phy);
 159
 160         dev_mc_unsync(master, dev);
 161         dev_uc_unsync(master, dev);
 162         if (dev->flags & IFF_ALLMULTI)
 163                 dev_set_allmulti(master, -1);
 164         if (dev->flags & IFF_PROMISC)
 165                 dev_set_promiscuity(master, -1);
 166
 167         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 168                 dev_uc_del(master, dev->dev_addr);
 169
 170         if (ds->ops->port_disable)
 171                 ds->ops->port_disable(ds, p->port, p->phy);
 172
 173         dsa_port_set_stp_state(ds, p->port, BR_STATE_DISABLED);
 174
 175         return 0;
 176 }
 177
 178 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 179 {
 180         struct dsa_slave_priv *p = netdev_priv(dev);
 181         struct net_device *master = p->parent->dst->master_netdev;
 182
 183         if (dev->flags & IFF_UP) {
 184                 if (change & IFF_ALLMULTI)
 185                         dev_set_allmulti(master,
 186                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 187                 if (change & IFF_PROMISC)
 188                         dev_set_promiscuity(master,
 189                                             dev->flags & IFF_PROMISC ? 1 : -1);
 190         }
 191 }
 192
 193 static void dsa_slave_set_rx_mode(struct net_device *dev)
 194 {
 195         struct dsa_slave_priv *p = netdev_priv(dev);
 196         struct net_device *master = p->parent->dst->master_netdev;
 197
 198         dev_mc_sync(master, dev);
 199         dev_uc_sync(master, dev);
 200 }
 201
 202 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 203 {
 204         struct dsa_slave_priv *p = netdev_priv(dev);
 205         struct net_device *master = p->parent->dst->master_netdev;
 206         struct sockaddr *addr = a;
 207         int err;
 208
 209         if (!is_valid_ether_addr(addr->sa_data))
 210                 return -EADDRNOTAVAIL;
 211
 212         if (!(dev->flags & IFF_UP))
 213                 goto out;
 214
 215         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 216                 err = dev_uc_add(master, addr->sa_data);
 217                 if (err < 0)
 218                         return err;
 219         }
 220
 221         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 222                 dev_uc_del(master, dev->dev_addr);
 223
 224 out:
 225         ether_addr_copy(dev->dev_addr, addr->sa_data);
 226
 227         return 0;
 228 }
 229
 230 static int dsa_slave_port_vlan_add(struct net_device *dev,
 231                                    const struct switchdev_obj_port_vlan *vlan,
 232                                    struct switchdev_trans *trans)
 233 {
 234         struct dsa_slave_priv *p = netdev_priv(dev);
 235         struct dsa_switch *ds = p->parent;
 236
 237         if (switchdev_trans_ph_prepare(trans)) {
 238                 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
 239                         return -EOPNOTSUPP;
 240
 241                 return ds->ops->port_vlan_prepare(ds, p->port, vlan, trans);
 242         }
 243
 244         ds->ops->port_vlan_add(ds, p->port, vlan, trans);
 245
 246         return 0;
 247 }
 248
 249 static int dsa_slave_port_vlan_del(struct net_device *dev,
 250                                    const struct switchdev_obj_port_vlan *vlan)
 251 {
 252         struct dsa_slave_priv *p = netdev_priv(dev);
 253         struct dsa_switch *ds = p->parent;
 254
 255         if (!ds->ops->port_vlan_del)
 256                 return -EOPNOTSUPP;
 257
 258         return ds->ops->port_vlan_del(ds, p->port, vlan);
 259 }
 260
 261 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 262                                     struct switchdev_obj_port_vlan *vlan,
 263                                     switchdev_obj_dump_cb_t *cb)
 264 {
 265         struct dsa_slave_priv *p = netdev_priv(dev);
 266         struct dsa_switch *ds = p->parent;
 267
 268         if (ds->ops->port_vlan_dump)
 269                 return ds->ops->port_vlan_dump(ds, p->port, vlan, cb);
 270
 271         return -EOPNOTSUPP;
 272 }
 273
 274 static int dsa_slave_port_fdb_add(struct net_device *dev,
 275                                   const struct switchdev_obj_port_fdb *fdb,
 276                                   struct switchdev_trans *trans)
 277 {
 278         struct dsa_slave_priv *p = netdev_priv(dev);
 279         struct dsa_switch *ds = p->parent;
 280
 281         if (switchdev_trans_ph_prepare(trans)) {
 282                 if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add)
 283                         return -EOPNOTSUPP;
 284
 285                 return ds->ops->port_fdb_prepare(ds, p->port, fdb, trans);
 286         }
 287
 288         ds->ops->port_fdb_add(ds, p->port, fdb, trans);
 289
 290         return 0;
 291 }
 292
 293 static int dsa_slave_port_fdb_del(struct net_device *dev,
 294                                   const struct switchdev_obj_port_fdb *fdb)
 295 {
 296         struct dsa_slave_priv *p = netdev_priv(dev);
 297         struct dsa_switch *ds = p->parent;
 298         int ret = -EOPNOTSUPP;
 299
 300         if (ds->ops->port_fdb_del)
 301                 ret = ds->ops->port_fdb_del(ds, p->port, fdb);
 302
 303         return ret;
 304 }
 305
 306 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 307                                    struct switchdev_obj_port_fdb *fdb,
 308                                    switchdev_obj_dump_cb_t *cb)
 309 {
 310         struct dsa_slave_priv *p = netdev_priv(dev);
 311         struct dsa_switch *ds = p->parent;
 312
 313         if (ds->ops->port_fdb_dump)
 314                 return ds->ops->port_fdb_dump(ds, p->port, fdb, cb);
 315
 316         return -EOPNOTSUPP;
 317 }
 318
 319 static int dsa_slave_port_mdb_add(struct net_device *dev,
 320                                   const struct switchdev_obj_port_mdb *mdb,
 321                                   struct switchdev_trans *trans)
 322 {
 323         struct dsa_slave_priv *p = netdev_priv(dev);
 324         struct dsa_switch *ds = p->parent;
 325
 326         if (switchdev_trans_ph_prepare(trans)) {
 327                 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
 328                         return -EOPNOTSUPP;
 329
 330                 return ds->ops->port_mdb_prepare(ds, p->port, mdb, trans);
 331         }
 332
 333         ds->ops->port_mdb_add(ds, p->port, mdb, trans);
 334
 335         return 0;
 336 }
 337
 338 static int dsa_slave_port_mdb_del(struct net_device *dev,
 339                                   const struct switchdev_obj_port_mdb *mdb)
 340 {
 341         struct dsa_slave_priv *p = netdev_priv(dev);
 342         struct dsa_switch *ds = p->parent;
 343
 344         if (ds->ops->port_mdb_del)
 345                 return ds->ops->port_mdb_del(ds, p->port, mdb);
 346
 347         return -EOPNOTSUPP;
 348 }
 349
 350 static int dsa_slave_port_mdb_dump(struct net_device *dev,
 351                                    struct switchdev_obj_port_mdb *mdb,
 352                                    switchdev_obj_dump_cb_t *cb)
 353 {
 354         struct dsa_slave_priv *p = netdev_priv(dev);
 355         struct dsa_switch *ds = p->parent;
 356
 357         if (ds->ops->port_mdb_dump)
 358                 return ds->ops->port_mdb_dump(ds, p->port, mdb, cb);
 359
 360         return -EOPNOTSUPP;
 361 }
 362
 363 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 364 {
 365         struct dsa_slave_priv *p = netdev_priv(dev);
 366
 367         if (p->phy != NULL)
 368                 return phy_mii_ioctl(p->phy, ifr, cmd);
 369
 370         return -EOPNOTSUPP;
 371 }
 372
 373 static int dsa_slave_stp_state_set(struct net_device *dev,
 374                                    const struct switchdev_attr *attr,
 375                                    struct switchdev_trans *trans)
 376 {
 377         struct dsa_slave_priv *p = netdev_priv(dev);
 378         struct dsa_switch *ds = p->parent;
 379
 380         if (switchdev_trans_ph_prepare(trans))
 381                 return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;
 382
 383         dsa_port_set_stp_state(ds, p->port, attr->u.stp_state);
 384
 385         return 0;
 386 }
 387
 388 static int dsa_slave_vlan_filtering(struct net_device *dev,
 389                                     const struct switchdev_attr *attr,
 390                                     struct switchdev_trans *trans)
 391 {
 392         struct dsa_slave_priv *p = netdev_priv(dev);
 393         struct dsa_switch *ds = p->parent;
 394
 395         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 396         if (switchdev_trans_ph_prepare(trans))
 397                 return 0;
 398
 399         if (ds->ops->port_vlan_filtering)
 400                 return ds->ops->port_vlan_filtering(ds, p->port,
 401                                                     attr->u.vlan_filtering);
 402
 403         return 0;
 404 }
 405
 406 static int dsa_fastest_ageing_time(struct dsa_switch *ds,
 407                                    unsigned int ageing_time)
 408 {
 409         int i;
 410
 411         for (i = 0; i < DSA_MAX_PORTS; ++i) {
 412                 struct dsa_port *dp = &ds->ports[i];
 413
 414                 if (dp && dp->ageing_time && dp->ageing_time < ageing_time)
 415                         ageing_time = dp->ageing_time;
 416         }
 417
 418         return ageing_time;
 419 }
 420
 421 static int dsa_slave_ageing_time(struct net_device *dev,
 422                                  const struct switchdev_attr *attr,
 423                                  struct switchdev_trans *trans)
 424 {
 425         struct dsa_slave_priv *p = netdev_priv(dev);
 426         struct dsa_switch *ds = p->parent;
 427         unsigned long ageing_jiffies = clock_t_to_jiffies(attr->u.ageing_time);
 428         unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
 429
 430         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 431         if (switchdev_trans_ph_prepare(trans))
 432                 return 0;
 433
 434         /* Keep the fastest ageing time in case of multiple bridges */
 435         ds->ports[p->port].ageing_time = ageing_time;
 436         ageing_time = dsa_fastest_ageing_time(ds, ageing_time);
 437
 438         if (ds->ops->set_ageing_time)
 439                 return ds->ops->set_ageing_time(ds, ageing_time);
 440
 441         return 0;
 442 }
 443
 444 static int dsa_slave_port_attr_set(struct net_device *dev,
 445                                    const struct switchdev_attr *attr,
 446                                    struct switchdev_trans *trans)
 447 {
 448         int ret;
 449
 450         switch (attr->id) {
 451         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 452                 ret = dsa_slave_stp_state_set(dev, attr, trans);
 453                 break;
 454         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 455                 ret = dsa_slave_vlan_filtering(dev, attr, trans);
 456                 break;
 457         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 458                 ret = dsa_slave_ageing_time(dev, attr, trans);
 459                 break;
 460         default:
 461                 ret = -EOPNOTSUPP;
 462                 break;
 463         }
 464
 465         return ret;
 466 }
 467
 468 static int dsa_slave_port_obj_add(struct net_device *dev,
 469                                   const struct switchdev_obj *obj,
 470                                   struct switchdev_trans *trans)
 471 {
 472         int err;
 473
 474         /* For the prepare phase, ensure the full set of changes is feasable in
 475          * one go in order to signal a failure properly. If an operation is not
 476          * supported, return -EOPNOTSUPP.
 477          */
 478
 479         switch (obj->id) {
 480         case SWITCHDEV_OBJ_ID_PORT_FDB:
 481                 err = dsa_slave_port_fdb_add(dev,
 482                                              SWITCHDEV_OBJ_PORT_FDB(obj),
 483                                              trans);
 484                 break;
 485         case SWITCHDEV_OBJ_ID_PORT_MDB:
 486                 err = dsa_slave_port_mdb_add(dev, SWITCHDEV_OBJ_PORT_MDB(obj),
 487                                              trans);
 488                 break;
 489         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 490                 err = dsa_slave_port_vlan_add(dev,
 491                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 492                                               trans);
 493                 break;
 494         default:
 495                 err = -EOPNOTSUPP;
 496                 break;
 497         }
 498
 499         return err;
 500 }
 501
 502 static int dsa_slave_port_obj_del(struct net_device *dev,
 503                                   const struct switchdev_obj *obj)
 504 {
 505         int err;
 506
 507         switch (obj->id) {
 508         case SWITCHDEV_OBJ_ID_PORT_FDB:
 509                 err = dsa_slave_port_fdb_del(dev,
 510                                              SWITCHDEV_OBJ_PORT_FDB(obj));
 511                 break;
 512         case SWITCHDEV_OBJ_ID_PORT_MDB:
 513                 err = dsa_slave_port_mdb_del(dev, SWITCHDEV_OBJ_PORT_MDB(obj));
 514                 break;
 515         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 516                 err = dsa_slave_port_vlan_del(dev,
 517                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 518                 break;
 519         default:
 520                 err = -EOPNOTSUPP;
 521                 break;
 522         }
 523
 524         return err;
 525 }
 526
 527 static int dsa_slave_port_obj_dump(struct net_device *dev,
 528                                    struct switchdev_obj *obj,
 529                                    switchdev_obj_dump_cb_t *cb)
 530 {
 531         int err;
 532
 533         switch (obj->id) {
 534         case SWITCHDEV_OBJ_ID_PORT_FDB:
 535                 err = dsa_slave_port_fdb_dump(dev,
 536                                               SWITCHDEV_OBJ_PORT_FDB(obj),
 537                                               cb);
 538                 break;
 539         case SWITCHDEV_OBJ_ID_PORT_MDB:
 540                 err = dsa_slave_port_mdb_dump(dev, SWITCHDEV_OBJ_PORT_MDB(obj),
 541                                               cb);
 542                 break;
 543         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 544                 err = dsa_slave_port_vlan_dump(dev,
 545                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 546                                                cb);
 547                 break;
 548         default:
 549                 err = -EOPNOTSUPP;
 550                 break;
 551         }
 552
 553         return err;
 554 }
 555
 556 static int dsa_slave_bridge_port_join(struct net_device *dev,
 557                                       struct net_device *br)
 558 {
 559         struct dsa_slave_priv *p = netdev_priv(dev);
 560         struct dsa_switch *ds = p->parent;
 561         int ret = -EOPNOTSUPP;
 562
 563         p->bridge_dev = br;
 564
 565         if (ds->ops->port_bridge_join)
 566                 ret = ds->ops->port_bridge_join(ds, p->port, br);
 567
 568         return ret == -EOPNOTSUPP ? 0 : ret;
 569 }
 570
 571 static void dsa_slave_bridge_port_leave(struct net_device *dev)
 572 {
 573         struct dsa_slave_priv *p = netdev_priv(dev);
 574         struct dsa_switch *ds = p->parent;
 575
 576
 577         if (ds->ops->port_bridge_leave)
 578                 ds->ops->port_bridge_leave(ds, p->port);
 579
 580         p->bridge_dev = NULL;
 581
 582         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 583          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 584          */
 585         dsa_port_set_stp_state(ds, p->port, BR_STATE_FORWARDING);
 586 }
 587
 588 static int dsa_slave_port_attr_get(struct net_device *dev,
 589                                    struct switchdev_attr *attr)
 590 {
 591         struct dsa_slave_priv *p = netdev_priv(dev);
 592         struct dsa_switch *ds = p->parent;
 593
 594         switch (attr->id) {
 595         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 596                 attr->u.ppid.id_len = sizeof(ds->index);
 597                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 598                 break;
 599         default:
 600                 return -EOPNOTSUPP;
 601         }
 602
 603         return 0;
 604 }
 605
 606 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 607                                                struct sk_buff *skb)
 608 {
 609 #ifdef CONFIG_NET_POLL_CONTROLLER
 610         if (p->netpoll)
 611                 netpoll_send_skb(p->netpoll, skb);
 612 #else
 613         BUG();
 614 #endif
 615         return NETDEV_TX_OK;
 616 }
 617
 618 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 619 {
 620         struct dsa_slave_priv *p = netdev_priv(dev);
 621         struct sk_buff *nskb;
 622
 623         dev->stats.tx_packets++;
 624         dev->stats.tx_bytes += skb->len;
 625
 626         /* Transmit function may have to reallocate the original SKB */
 627         nskb = p->xmit(skb, dev);
 628         if (!nskb)
 629                 return NETDEV_TX_OK;
 630
 631         /* SKB for netpoll still need to be mangled with the protocol-specific
 632          * tag to be successfully transmitted
 633          */
 634         if (unlikely(netpoll_tx_running(dev)))
 635                 return dsa_netpoll_send_skb(p, nskb);
 636
 637         /* Queue the SKB for transmission on the parent interface, but
 638          * do not modify its EtherType
 639          */
 640         nskb->dev = p->parent->dst->master_netdev;
 641         dev_queue_xmit(nskb);
 642
 643         return NETDEV_TX_OK;
 644 }
 645
 646 /* ethtool operations *******************************************************/
 647 static int
 648 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 649 {
 650         struct dsa_slave_priv *p = netdev_priv(dev);
 651         int err;
 652
 653         err = -EOPNOTSUPP;
 654         if (p->phy != NULL) {
 655                 err = phy_read_status(p->phy);
 656                 if (err == 0)
 657                         err = phy_ethtool_gset(p->phy, cmd);
 658         }
 659
 660         return err;
 661 }
 662
 663 static int
 664 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 665 {
 666         struct dsa_slave_priv *p = netdev_priv(dev);
 667
 668         if (p->phy != NULL)
 669                 return phy_ethtool_sset(p->phy, cmd);
 670
 671         return -EOPNOTSUPP;
 672 }
 673
 674 static void dsa_slave_get_drvinfo(struct net_device *dev,
 675                                   struct ethtool_drvinfo *drvinfo)
 676 {
 677         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 678         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 679         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 680         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 681 }
 682
 683 static int dsa_slave_get_regs_len(struct net_device *dev)
 684 {
 685         struct dsa_slave_priv *p = netdev_priv(dev);
 686         struct dsa_switch *ds = p->parent;
 687
 688         if (ds->ops->get_regs_len)
 689                 return ds->ops->get_regs_len(ds, p->port);
 690
 691         return -EOPNOTSUPP;
 692 }
 693
 694 static void
 695 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 696 {
 697         struct dsa_slave_priv *p = netdev_priv(dev);
 698         struct dsa_switch *ds = p->parent;
 699
 700         if (ds->ops->get_regs)
 701                 ds->ops->get_regs(ds, p->port, regs, _p);
 702 }
 703
 704 static int dsa_slave_nway_reset(struct net_device *dev)
 705 {
 706         struct dsa_slave_priv *p = netdev_priv(dev);
 707
 708         if (p->phy != NULL)
 709                 return genphy_restart_aneg(p->phy);
 710
 711         return -EOPNOTSUPP;
 712 }
 713
 714 static u32 dsa_slave_get_link(struct net_device *dev)
 715 {
 716         struct dsa_slave_priv *p = netdev_priv(dev);
 717
 718         if (p->phy != NULL) {
 719                 genphy_update_link(p->phy);
 720                 return p->phy->link;
 721         }
 722
 723         return -EOPNOTSUPP;
 724 }
 725
 726 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 727 {
 728         struct dsa_slave_priv *p = netdev_priv(dev);
 729         struct dsa_switch *ds = p->parent;
 730
 731         if (ds->cd && ds->cd->eeprom_len)
 732                 return ds->cd->eeprom_len;
 733
 734         if (ds->ops->get_eeprom_len)
 735                 return ds->ops->get_eeprom_len(ds);
 736
 737         return 0;
 738 }
 739
 740 static int dsa_slave_get_eeprom(struct net_device *dev,
 741                                 struct ethtool_eeprom *eeprom, u8 *data)
 742 {
 743         struct dsa_slave_priv *p = netdev_priv(dev);
 744         struct dsa_switch *ds = p->parent;
 745
 746         if (ds->ops->get_eeprom)
 747                 return ds->ops->get_eeprom(ds, eeprom, data);
 748
 749         return -EOPNOTSUPP;
 750 }
 751
 752 static int dsa_slave_set_eeprom(struct net_device *dev,
 753                                 struct ethtool_eeprom *eeprom, u8 *data)
 754 {
 755         struct dsa_slave_priv *p = netdev_priv(dev);
 756         struct dsa_switch *ds = p->parent;
 757
 758         if (ds->ops->set_eeprom)
 759                 return ds->ops->set_eeprom(ds, eeprom, data);
 760
 761         return -EOPNOTSUPP;
 762 }
 763
 764 static void dsa_slave_get_strings(struct net_device *dev,
 765                                   uint32_t stringset, uint8_t *data)
 766 {
 767         struct dsa_slave_priv *p = netdev_priv(dev);
 768         struct dsa_switch *ds = p->parent;
 769
 770         if (stringset == ETH_SS_STATS) {
 771                 int len = ETH_GSTRING_LEN;
 772
 773                 strncpy(data, "tx_packets", len);
 774                 strncpy(data + len, "tx_bytes", len);
 775                 strncpy(data + 2 * len, "rx_packets", len);
 776                 strncpy(data + 3 * len, "rx_bytes", len);
 777                 if (ds->ops->get_strings)
 778                         ds->ops->get_strings(ds, p->port, data + 4 * len);
 779         }
 780 }
 781
 782 static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
 783                                            struct ethtool_stats *stats,
 784                                            uint64_t *data)
 785 {
 786         struct dsa_switch_tree *dst = dev->dsa_ptr;
 787         struct dsa_switch *ds = dst->ds[0];
 788         s8 cpu_port = dst->cpu_port;
 789         int count = 0;
 790
 791         if (dst->master_ethtool_ops.get_sset_count) {
 792                 count = dst->master_ethtool_ops.get_sset_count(dev,
 793                                                                ETH_SS_STATS);
 794                 dst->master_ethtool_ops.get_ethtool_stats(dev, stats, data);
 795         }
 796
 797         if (ds->ops->get_ethtool_stats)
 798                 ds->ops->get_ethtool_stats(ds, cpu_port, data + count);
 799 }
 800
 801 static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
 802 {
 803         struct dsa_switch_tree *dst = dev->dsa_ptr;
 804         struct dsa_switch *ds = dst->ds[0];
 805         int count = 0;
 806
 807         if (dst->master_ethtool_ops.get_sset_count)
 808                 count += dst->master_ethtool_ops.get_sset_count(dev, sset);
 809
 810         if (sset == ETH_SS_STATS && ds->ops->get_sset_count)
 811                 count += ds->ops->get_sset_count(ds);
 812
 813         return count;
 814 }
 815
 816 static void dsa_cpu_port_get_strings(struct net_device *dev,
 817                                      uint32_t stringset, uint8_t *data)
 818 {
 819         struct dsa_switch_tree *dst = dev->dsa_ptr;
 820         struct dsa_switch *ds = dst->ds[0];
 821         s8 cpu_port = dst->cpu_port;
 822         int len = ETH_GSTRING_LEN;
 823         int mcount = 0, count;
 824         unsigned int i;
 825         uint8_t pfx[4];
 826         uint8_t *ndata;
 827
 828         snprintf(pfx, sizeof(pfx), "p%.2d", cpu_port);
 829         /* We do not want to be NULL-terminated, since this is a prefix */
 830         pfx[sizeof(pfx) - 1] = '_';
 831
 832         if (dst->master_ethtool_ops.get_sset_count) {
 833                 mcount = dst->master_ethtool_ops.get_sset_count(dev,
 834                                                                 ETH_SS_STATS);
 835                 dst->master_ethtool_ops.get_strings(dev, stringset, data);
 836         }
 837
 838         if (stringset == ETH_SS_STATS && ds->ops->get_strings) {
 839                 ndata = data + mcount * len;
 840                 /* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
 841                  * the output after to prepend our CPU port prefix we
 842                  * constructed earlier
 843                  */
 844                 ds->ops->get_strings(ds, cpu_port, ndata);
 845                 count = ds->ops->get_sset_count(ds);
 846                 for (i = 0; i < count; i++) {
 847                         memmove(ndata + (i * len + sizeof(pfx)),
 848                                 ndata + i * len, len - sizeof(pfx));
 849                         memcpy(ndata + i * len, pfx, sizeof(pfx));
 850                 }
 851         }
 852 }
 853
 854 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 855                                         struct ethtool_stats *stats,
 856                                         uint64_t *data)
 857 {
 858         struct dsa_slave_priv *p = netdev_priv(dev);
 859         struct dsa_switch *ds = p->parent;
 860
 861         data[0] = dev->stats.tx_packets;
 862         data[1] = dev->stats.tx_bytes;
 863         data[2] = dev->stats.rx_packets;
 864         data[3] = dev->stats.rx_bytes;
 865         if (ds->ops->get_ethtool_stats)
 866                 ds->ops->get_ethtool_stats(ds, p->port, data + 4);
 867 }
 868
 869 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 870 {
 871         struct dsa_slave_priv *p = netdev_priv(dev);
 872         struct dsa_switch *ds = p->parent;
 873
 874         if (sset == ETH_SS_STATS) {
 875                 int count;
 876
 877                 count = 4;
 878                 if (ds->ops->get_sset_count)
 879                         count += ds->ops->get_sset_count(ds);
 880
 881                 return count;
 882         }
 883
 884         return -EOPNOTSUPP;
 885 }
 886
 887 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 888 {
 889         struct dsa_slave_priv *p = netdev_priv(dev);
 890         struct dsa_switch *ds = p->parent;
 891
 892         if (ds->ops->get_wol)
 893                 ds->ops->get_wol(ds, p->port, w);
 894 }
 895
 896 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 897 {
 898         struct dsa_slave_priv *p = netdev_priv(dev);
 899         struct dsa_switch *ds = p->parent;
 900         int ret = -EOPNOTSUPP;
 901
 902         if (ds->ops->set_wol)
 903                 ret = ds->ops->set_wol(ds, p->port, w);
 904
 905         return ret;
 906 }
 907
 908 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 909 {
 910         struct dsa_slave_priv *p = netdev_priv(dev);
 911         struct dsa_switch *ds = p->parent;
 912         int ret;
 913
 914         if (!ds->ops->set_eee)
 915                 return -EOPNOTSUPP;
 916
 917         ret = ds->ops->set_eee(ds, p->port, p->phy, e);
 918         if (ret)
 919                 return ret;
 920
 921         if (p->phy)
 922                 ret = phy_ethtool_set_eee(p->phy, e);
 923
 924         return ret;
 925 }
 926
 927 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 928 {
 929         struct dsa_slave_priv *p = netdev_priv(dev);
 930         struct dsa_switch *ds = p->parent;
 931         int ret;
 932
 933         if (!ds->ops->get_eee)
 934                 return -EOPNOTSUPP;
 935
 936         ret = ds->ops->get_eee(ds, p->port, e);
 937         if (ret)
 938                 return ret;
 939
 940         if (p->phy)
 941                 ret = phy_ethtool_get_eee(p->phy, e);
 942
 943         return ret;
 944 }
 945
 946 #ifdef CONFIG_NET_POLL_CONTROLLER
 947 static int dsa_slave_netpoll_setup(struct net_device *dev,
 948                                    struct netpoll_info *ni)
 949 {
 950         struct dsa_slave_priv *p = netdev_priv(dev);
 951         struct dsa_switch *ds = p->parent;
 952         struct net_device *master = ds->dst->master_netdev;
 953         struct netpoll *netpoll;
 954         int err = 0;
 955
 956         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 957         if (!netpoll)
 958                 return -ENOMEM;
 959
 960         err = __netpoll_setup(netpoll, master);
 961         if (err) {
 962                 kfree(netpoll);
 963                 goto out;
 964         }
 965
 966         p->netpoll = netpoll;
 967 out:
 968         return err;
 969 }
 970
 971 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 972 {
 973         struct dsa_slave_priv *p = netdev_priv(dev);
 974         struct netpoll *netpoll = p->netpoll;
 975
 976         if (!netpoll)
 977                 return;
 978
 979         p->netpoll = NULL;
 980
 981         __netpoll_free_async(netpoll);
 982 }
 983
 984 static void dsa_slave_poll_controller(struct net_device *dev)
 985 {
 986 }
 987 #endif
 988
 989 void dsa_cpu_port_ethtool_init(struct ethtool_ops *ops)
 990 {
 991         ops->get_sset_count = dsa_cpu_port_get_sset_count;
 992         ops->get_ethtool_stats = dsa_cpu_port_get_ethtool_stats;
 993         ops->get_strings = dsa_cpu_port_get_strings;
 994 }
 995
 996 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 997         .get_settings           = dsa_slave_get_settings,
 998         .set_settings           = dsa_slave_set_settings,
 999         .get_drvinfo            = dsa_slave_get_drvinfo,
1000         .get_regs_len           = dsa_slave_get_regs_len,
1001         .get_regs               = dsa_slave_get_regs,
1002         .nway_reset             = dsa_slave_nway_reset,
1003         .get_link               = dsa_slave_get_link,
1004         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1005         .get_eeprom             = dsa_slave_get_eeprom,
1006         .set_eeprom             = dsa_slave_set_eeprom,
1007         .get_strings            = dsa_slave_get_strings,
1008         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1009         .get_sset_count         = dsa_slave_get_sset_count,
1010         .set_wol                = dsa_slave_set_wol,
1011         .get_wol                = dsa_slave_get_wol,
1012         .set_eee                = dsa_slave_set_eee,
1013         .get_eee                = dsa_slave_get_eee,
1014 };
1015
1016 static const struct net_device_ops dsa_slave_netdev_ops = {
1017         .ndo_open               = dsa_slave_open,
1018         .ndo_stop               = dsa_slave_close,
1019         .ndo_start_xmit         = dsa_slave_xmit,
1020         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1021         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1022         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1023         .ndo_fdb_add            = switchdev_port_fdb_add,
1024         .ndo_fdb_del            = switchdev_port_fdb_del,
1025         .ndo_fdb_dump           = switchdev_port_fdb_dump,
1026         .ndo_do_ioctl           = dsa_slave_ioctl,
1027         .ndo_get_iflink         = dsa_slave_get_iflink,
1028 #ifdef CONFIG_NET_POLL_CONTROLLER
1029         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1030         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1031         .ndo_poll_controller    = dsa_slave_poll_controller,
1032 #endif
1033         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
1034         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
1035         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
1036 };
1037
1038 static const struct switchdev_ops dsa_slave_switchdev_ops = {
1039         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
1040         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
1041         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
1042         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
1043         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
1044 };
1045
1046 static struct device_type dsa_type = {
1047         .name   = "dsa",
1048 };
1049
1050 static void dsa_slave_adjust_link(struct net_device *dev)
1051 {
1052         struct dsa_slave_priv *p = netdev_priv(dev);
1053         struct dsa_switch *ds = p->parent;
1054         unsigned int status_changed = 0;
1055
1056         if (p->old_link != p->phy->link) {
1057                 status_changed = 1;
1058                 p->old_link = p->phy->link;
1059         }
1060
1061         if (p->old_duplex != p->phy->duplex) {
1062                 status_changed = 1;
1063                 p->old_duplex = p->phy->duplex;
1064         }
1065
1066         if (p->old_pause != p->phy->pause) {
1067                 status_changed = 1;
1068                 p->old_pause = p->phy->pause;
1069         }
1070
1071         if (ds->ops->adjust_link && status_changed)
1072                 ds->ops->adjust_link(ds, p->port, p->phy);
1073
1074         if (status_changed)
1075                 phy_print_status(p->phy);
1076 }
1077
1078 static int dsa_slave_fixed_link_update(struct net_device *dev,
1079                                        struct fixed_phy_status *status)
1080 {
1081         struct dsa_slave_priv *p;
1082         struct dsa_switch *ds;
1083
1084         if (dev) {
1085                 p = netdev_priv(dev);
1086                 ds = p->parent;
1087                 if (ds->ops->fixed_link_update)
1088                         ds->ops->fixed_link_update(ds, p->port, status);
1089         }
1090
1091         return 0;
1092 }
1093
1094 /* slave device setup *******************************************************/
1095 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
1096                                  struct net_device *slave_dev,
1097                                  int addr)
1098 {
1099         struct dsa_switch *ds = p->parent;
1100
1101         p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
1102         if (!p->phy) {
1103                 netdev_err(slave_dev, "no phy at %d\n", addr);
1104                 return -ENODEV;
1105         }
1106
1107         /* Use already configured phy mode */
1108         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1109                 p->phy_interface = p->phy->interface;
1110         return phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1111                                   p->phy_interface);
1112 }
1113
1114 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1115                                 struct net_device *slave_dev)
1116 {
1117         struct dsa_switch *ds = p->parent;
1118         struct device_node *phy_dn, *port_dn;
1119         bool phy_is_fixed = false;
1120         u32 phy_flags = 0;
1121         int mode, ret;
1122
1123         port_dn = ds->ports[p->port].dn;
1124         mode = of_get_phy_mode(port_dn);
1125         if (mode < 0)
1126                 mode = PHY_INTERFACE_MODE_NA;
1127         p->phy_interface = mode;
1128
1129         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1130         if (!phy_dn && of_phy_is_fixed_link(port_dn)) {
1131                 /* In the case of a fixed PHY, the DT node associated
1132                  * to the fixed PHY is the Port DT node
1133                  */
1134                 ret = of_phy_register_fixed_link(port_dn);
1135                 if (ret) {
1136                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1137                         return ret;
1138                 }
1139                 phy_is_fixed = true;
1140                 phy_dn = of_node_get(port_dn);
1141         }
1142
1143         if (ds->ops->get_phy_flags)
1144                 phy_flags = ds->ops->get_phy_flags(ds, p->port);
1145
1146         if (phy_dn) {
1147                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1148
1149                 /* If this PHY address is part of phys_mii_mask, which means
1150                  * that we need to divert reads and writes to/from it, then we
1151                  * want to bind this device using the slave MII bus created by
1152                  * DSA to make that happen.
1153                  */
1154                 if (!phy_is_fixed && phy_id >= 0 &&
1155                     (ds->phys_mii_mask & (1 << phy_id))) {
1156                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1157                         if (ret) {
1158                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1159                                 of_node_put(phy_dn);
1160                                 return ret;
1161                         }
1162                 } else {
1163                         p->phy = of_phy_connect(slave_dev, phy_dn,
1164                                                 dsa_slave_adjust_link,
1165                                                 phy_flags,
1166                                                 p->phy_interface);
1167                 }
1168
1169                 of_node_put(phy_dn);
1170         }
1171
1172         if (p->phy && phy_is_fixed)
1173                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1174
1175         /* We could not connect to a designated PHY, so use the switch internal
1176          * MDIO bus instead
1177          */
1178         if (!p->phy) {
1179                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
1180                 if (ret) {
1181                         netdev_err(slave_dev, "failed to connect to port %d: %d\n", p->port, ret);
1182                         if (phy_is_fixed)
1183                                 of_phy_deregister_fixed_link(port_dn);
1184                         return ret;
1185                 }
1186         }
1187
1188         phy_attached_info(p->phy);
1189
1190         return 0;
1191 }
1192
1193 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1194 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1195                                             struct netdev_queue *txq,
1196                                             void *_unused)
1197 {
1198         lockdep_set_class(&txq->_xmit_lock,
1199                           &dsa_slave_netdev_xmit_lock_key);
1200 }
1201
1202 int dsa_slave_suspend(struct net_device *slave_dev)
1203 {
1204         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1205
1206         if (!netif_running(slave_dev))
1207                 return 0;
1208
1209         netif_device_detach(slave_dev);
1210
1211         if (p->phy) {
1212                 phy_stop(p->phy);
1213                 p->old_pause = -1;
1214                 p->old_link = -1;
1215                 p->old_duplex = -1;
1216                 phy_suspend(p->phy);
1217         }
1218
1219         return 0;
1220 }
1221
1222 int dsa_slave_resume(struct net_device *slave_dev)
1223 {
1224         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1225
1226         if (!netif_running(slave_dev))
1227                 return 0;
1228
1229         netif_device_attach(slave_dev);
1230
1231         if (p->phy) {
1232                 phy_resume(p->phy);
1233                 phy_start(p->phy);
1234         }
1235
1236         return 0;
1237 }
1238
1239 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1240                      int port, const char *name)
1241 {
1242         struct dsa_switch_tree *dst = ds->dst;
1243         struct net_device *master;
1244         struct net_device *slave_dev;
1245         struct dsa_slave_priv *p;
1246         int ret;
1247
1248         master = ds->dst->master_netdev;
1249         if (ds->master_netdev)
1250                 master = ds->master_netdev;
1251
1252         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1253                                  NET_NAME_UNKNOWN, ether_setup);
1254         if (slave_dev == NULL)
1255                 return -ENOMEM;
1256
1257         slave_dev->features = master->vlan_features;
1258         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1259         eth_hw_addr_inherit(slave_dev, master);
1260         slave_dev->priv_flags |= IFF_NO_QUEUE;
1261         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1262         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1263         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1264
1265         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1266                                  NULL);
1267
1268         SET_NETDEV_DEV(slave_dev, parent);
1269         slave_dev->dev.of_node = ds->ports[port].dn;
1270         slave_dev->vlan_features = master->vlan_features;
1271
1272         p = netdev_priv(slave_dev);
1273         p->parent = ds;
1274         p->port = port;
1275         p->xmit = dst->tag_ops->xmit;
1276
1277         p->old_pause = -1;
1278         p->old_link = -1;
1279         p->old_duplex = -1;
1280
1281         ds->ports[port].netdev = slave_dev;
1282
1283         netif_carrier_off(slave_dev);
1284
1285         ret = dsa_slave_phy_setup(p, slave_dev);
1286         if (ret) {
1287                 netdev_err(master, "error %d setting up slave phy\n", ret);
1288                 goto out_free;
1289         }
1290
1291         ret = register_netdev(slave_dev);
1292         if (ret) {
1293                 netdev_err(master, "error %d registering interface %s\n",
1294                            ret, slave_dev->name);
1295                 goto out_phy;
1296         }
1297
1298         return 0;
1299
1300 out_phy:
1301         phy_disconnect(p->phy);
1302         if (of_phy_is_fixed_link(ds->ports[port].dn))
1303                 of_phy_deregister_fixed_link(ds->ports[port].dn);
1304 out_free:
1305         free_netdev(slave_dev);
1306         ds->ports[port].netdev = NULL;
1307         return ret;
1308 }
1309
1310 void dsa_slave_destroy(struct net_device *slave_dev)
1311 {
1312         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1313         struct dsa_switch *ds = p->parent;
1314         struct device_node *port_dn;
1315
1316         port_dn = ds->ports[p->port].dn;
1317
1318         netif_carrier_off(slave_dev);
1319         if (p->phy) {
1320                 phy_disconnect(p->phy);
1321
1322                 if (of_phy_is_fixed_link(port_dn))
1323                         of_phy_deregister_fixed_link(port_dn);
1324         }
1325         unregister_netdev(slave_dev);
1326         free_netdev(slave_dev);
1327 }
1328
1329 static bool dsa_slave_dev_check(struct net_device *dev)
1330 {
1331         return dev->netdev_ops == &dsa_slave_netdev_ops;
1332 }
1333
1334 static int dsa_slave_port_upper_event(struct net_device *dev,
1335                                       unsigned long event, void *ptr)
1336 {
1337         struct netdev_notifier_changeupper_info *info = ptr;
1338         struct net_device *upper = info->upper_dev;
1339         int err = 0;
1340
1341         switch (event) {
1342         case NETDEV_CHANGEUPPER:
1343                 if (netif_is_bridge_master(upper)) {
1344                         if (info->linking)
1345                                 err = dsa_slave_bridge_port_join(dev, upper);
1346                         else
1347                                 dsa_slave_bridge_port_leave(dev);
1348                 }
1349
1350                 break;
1351         }
1352
1353         return notifier_from_errno(err);
1354 }
1355
1356 static int dsa_slave_port_event(struct net_device *dev, unsigned long event,
1357                                 void *ptr)
1358 {
1359         switch (event) {
1360         case NETDEV_CHANGEUPPER:
1361                 return dsa_slave_port_upper_event(dev, event, ptr);
1362         }
1363
1364         return NOTIFY_DONE;
1365 }
1366
1367 int dsa_slave_netdevice_event(struct notifier_block *unused,
1368                               unsigned long event, void *ptr)
1369 {
1370         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1371
1372         if (dsa_slave_dev_check(dev))
1373                 return dsa_slave_port_event(dev, event, ptr);
1374
1375         return NOTIFY_DONE;
1376 }