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 (change & IFF_ALLMULTI)
 184                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 185         if (change & IFF_PROMISC)
 186                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 187 }
 188
 189 static void dsa_slave_set_rx_mode(struct net_device *dev)
 190 {
 191         struct dsa_slave_priv *p = netdev_priv(dev);
 192         struct net_device *master = p->parent->dst->master_netdev;
 193
 194         dev_mc_sync(master, dev);
 195         dev_uc_sync(master, dev);
 196 }
 197
 198 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 199 {
 200         struct dsa_slave_priv *p = netdev_priv(dev);
 201         struct net_device *master = p->parent->dst->master_netdev;
 202         struct sockaddr *addr = a;
 203         int err;
 204
 205         if (!is_valid_ether_addr(addr->sa_data))
 206                 return -EADDRNOTAVAIL;
 207
 208         if (!(dev->flags & IFF_UP))
 209                 goto out;
 210
 211         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 212                 err = dev_uc_add(master, addr->sa_data);
 213                 if (err < 0)
 214                         return err;
 215         }
 216
 217         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 218                 dev_uc_del(master, dev->dev_addr);
 219
 220 out:
 221         ether_addr_copy(dev->dev_addr, addr->sa_data);
 222
 223         return 0;
 224 }
 225
 226 static int dsa_slave_port_vlan_add(struct net_device *dev,
 227                                    const struct switchdev_obj_port_vlan *vlan,
 228                                    struct switchdev_trans *trans)
 229 {
 230         struct dsa_slave_priv *p = netdev_priv(dev);
 231         struct dsa_switch *ds = p->parent;
 232
 233         if (switchdev_trans_ph_prepare(trans)) {
 234                 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
 235                         return -EOPNOTSUPP;
 236
 237                 return ds->ops->port_vlan_prepare(ds, p->port, vlan, trans);
 238         }
 239
 240         ds->ops->port_vlan_add(ds, p->port, vlan, trans);
 241
 242         return 0;
 243 }
 244
 245 static int dsa_slave_port_vlan_del(struct net_device *dev,
 246                                    const struct switchdev_obj_port_vlan *vlan)
 247 {
 248         struct dsa_slave_priv *p = netdev_priv(dev);
 249         struct dsa_switch *ds = p->parent;
 250
 251         if (!ds->ops->port_vlan_del)
 252                 return -EOPNOTSUPP;
 253
 254         return ds->ops->port_vlan_del(ds, p->port, vlan);
 255 }
 256
 257 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 258                                     struct switchdev_obj_port_vlan *vlan,
 259                                     switchdev_obj_dump_cb_t *cb)
 260 {
 261         struct dsa_slave_priv *p = netdev_priv(dev);
 262         struct dsa_switch *ds = p->parent;
 263
 264         if (ds->ops->port_vlan_dump)
 265                 return ds->ops->port_vlan_dump(ds, p->port, vlan, cb);
 266
 267         return -EOPNOTSUPP;
 268 }
 269
 270 static int dsa_slave_port_fdb_add(struct net_device *dev,
 271                                   const struct switchdev_obj_port_fdb *fdb,
 272                                   struct switchdev_trans *trans)
 273 {
 274         struct dsa_slave_priv *p = netdev_priv(dev);
 275         struct dsa_switch *ds = p->parent;
 276
 277         if (switchdev_trans_ph_prepare(trans)) {
 278                 if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add)
 279                         return -EOPNOTSUPP;
 280
 281                 return ds->ops->port_fdb_prepare(ds, p->port, fdb, trans);
 282         }
 283
 284         ds->ops->port_fdb_add(ds, p->port, fdb, trans);
 285
 286         return 0;
 287 }
 288
 289 static int dsa_slave_port_fdb_del(struct net_device *dev,
 290                                   const struct switchdev_obj_port_fdb *fdb)
 291 {
 292         struct dsa_slave_priv *p = netdev_priv(dev);
 293         struct dsa_switch *ds = p->parent;
 294         int ret = -EOPNOTSUPP;
 295
 296         if (ds->ops->port_fdb_del)
 297                 ret = ds->ops->port_fdb_del(ds, p->port, fdb);
 298
 299         return ret;
 300 }
 301
 302 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 303                                    struct switchdev_obj_port_fdb *fdb,
 304                                    switchdev_obj_dump_cb_t *cb)
 305 {
 306         struct dsa_slave_priv *p = netdev_priv(dev);
 307         struct dsa_switch *ds = p->parent;
 308
 309         if (ds->ops->port_fdb_dump)
 310                 return ds->ops->port_fdb_dump(ds, p->port, fdb, cb);
 311
 312         return -EOPNOTSUPP;
 313 }
 314
 315 static int dsa_slave_port_mdb_add(struct net_device *dev,
 316                                   const struct switchdev_obj_port_mdb *mdb,
 317                                   struct switchdev_trans *trans)
 318 {
 319         struct dsa_slave_priv *p = netdev_priv(dev);
 320         struct dsa_switch *ds = p->parent;
 321
 322         if (switchdev_trans_ph_prepare(trans)) {
 323                 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
 324                         return -EOPNOTSUPP;
 325
 326                 return ds->ops->port_mdb_prepare(ds, p->port, mdb, trans);
 327         }
 328
 329         ds->ops->port_mdb_add(ds, p->port, mdb, trans);
 330
 331         return 0;
 332 }
 333
 334 static int dsa_slave_port_mdb_del(struct net_device *dev,
 335                                   const struct switchdev_obj_port_mdb *mdb)
 336 {
 337         struct dsa_slave_priv *p = netdev_priv(dev);
 338         struct dsa_switch *ds = p->parent;
 339
 340         if (ds->ops->port_mdb_del)
 341                 return ds->ops->port_mdb_del(ds, p->port, mdb);
 342
 343         return -EOPNOTSUPP;
 344 }
 345
 346 static int dsa_slave_port_mdb_dump(struct net_device *dev,
 347                                    struct switchdev_obj_port_mdb *mdb,
 348                                    switchdev_obj_dump_cb_t *cb)
 349 {
 350         struct dsa_slave_priv *p = netdev_priv(dev);
 351         struct dsa_switch *ds = p->parent;
 352
 353         if (ds->ops->port_mdb_dump)
 354                 return ds->ops->port_mdb_dump(ds, p->port, mdb, cb);
 355
 356         return -EOPNOTSUPP;
 357 }
 358
 359 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 360 {
 361         struct dsa_slave_priv *p = netdev_priv(dev);
 362
 363         if (p->phy != NULL)
 364                 return phy_mii_ioctl(p->phy, ifr, cmd);
 365
 366         return -EOPNOTSUPP;
 367 }
 368
 369 static int dsa_slave_stp_state_set(struct net_device *dev,
 370                                    const struct switchdev_attr *attr,
 371                                    struct switchdev_trans *trans)
 372 {
 373         struct dsa_slave_priv *p = netdev_priv(dev);
 374         struct dsa_switch *ds = p->parent;
 375
 376         if (switchdev_trans_ph_prepare(trans))
 377                 return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;
 378
 379         dsa_port_set_stp_state(ds, p->port, attr->u.stp_state);
 380
 381         return 0;
 382 }
 383
 384 static int dsa_slave_vlan_filtering(struct net_device *dev,
 385                                     const struct switchdev_attr *attr,
 386                                     struct switchdev_trans *trans)
 387 {
 388         struct dsa_slave_priv *p = netdev_priv(dev);
 389         struct dsa_switch *ds = p->parent;
 390
 391         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 392         if (switchdev_trans_ph_prepare(trans))
 393                 return 0;
 394
 395         if (ds->ops->port_vlan_filtering)
 396                 return ds->ops->port_vlan_filtering(ds, p->port,
 397                                                     attr->u.vlan_filtering);
 398
 399         return 0;
 400 }
 401
 402 static int dsa_fastest_ageing_time(struct dsa_switch *ds,
 403                                    unsigned int ageing_time)
 404 {
 405         int i;
 406
 407         for (i = 0; i < DSA_MAX_PORTS; ++i) {
 408                 struct dsa_port *dp = &ds->ports[i];
 409
 410                 if (dp && dp->ageing_time && dp->ageing_time < ageing_time)
 411                         ageing_time = dp->ageing_time;
 412         }
 413
 414         return ageing_time;
 415 }
 416
 417 static int dsa_slave_ageing_time(struct net_device *dev,
 418                                  const struct switchdev_attr *attr,
 419                                  struct switchdev_trans *trans)
 420 {
 421         struct dsa_slave_priv *p = netdev_priv(dev);
 422         struct dsa_switch *ds = p->parent;
 423         unsigned long ageing_jiffies = clock_t_to_jiffies(attr->u.ageing_time);
 424         unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
 425
 426         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 427         if (switchdev_trans_ph_prepare(trans))
 428                 return 0;
 429
 430         /* Keep the fastest ageing time in case of multiple bridges */
 431         ds->ports[p->port].ageing_time = ageing_time;
 432         ageing_time = dsa_fastest_ageing_time(ds, ageing_time);
 433
 434         if (ds->ops->set_ageing_time)
 435                 return ds->ops->set_ageing_time(ds, ageing_time);
 436
 437         return 0;
 438 }
 439
 440 static int dsa_slave_port_attr_set(struct net_device *dev,
 441                                    const struct switchdev_attr *attr,
 442                                    struct switchdev_trans *trans)
 443 {
 444         int ret;
 445
 446         switch (attr->id) {
 447         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 448                 ret = dsa_slave_stp_state_set(dev, attr, trans);
 449                 break;
 450         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 451                 ret = dsa_slave_vlan_filtering(dev, attr, trans);
 452                 break;
 453         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 454                 ret = dsa_slave_ageing_time(dev, attr, trans);
 455                 break;
 456         default:
 457                 ret = -EOPNOTSUPP;
 458                 break;
 459         }
 460
 461         return ret;
 462 }
 463
 464 static int dsa_slave_port_obj_add(struct net_device *dev,
 465                                   const struct switchdev_obj *obj,
 466                                   struct switchdev_trans *trans)
 467 {
 468         int err;
 469
 470         /* For the prepare phase, ensure the full set of changes is feasable in
 471          * one go in order to signal a failure properly. If an operation is not
 472          * supported, return -EOPNOTSUPP.
 473          */
 474
 475         switch (obj->id) {
 476         case SWITCHDEV_OBJ_ID_PORT_FDB:
 477                 err = dsa_slave_port_fdb_add(dev,
 478                                              SWITCHDEV_OBJ_PORT_FDB(obj),
 479                                              trans);
 480                 break;
 481         case SWITCHDEV_OBJ_ID_PORT_MDB:
 482                 err = dsa_slave_port_mdb_add(dev, SWITCHDEV_OBJ_PORT_MDB(obj),
 483                                              trans);
 484                 break;
 485         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 486                 err = dsa_slave_port_vlan_add(dev,
 487                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 488                                               trans);
 489                 break;
 490         default:
 491                 err = -EOPNOTSUPP;
 492                 break;
 493         }
 494
 495         return err;
 496 }
 497
 498 static int dsa_slave_port_obj_del(struct net_device *dev,
 499                                   const struct switchdev_obj *obj)
 500 {
 501         int err;
 502
 503         switch (obj->id) {
 504         case SWITCHDEV_OBJ_ID_PORT_FDB:
 505                 err = dsa_slave_port_fdb_del(dev,
 506                                              SWITCHDEV_OBJ_PORT_FDB(obj));
 507                 break;
 508         case SWITCHDEV_OBJ_ID_PORT_MDB:
 509                 err = dsa_slave_port_mdb_del(dev, SWITCHDEV_OBJ_PORT_MDB(obj));
 510                 break;
 511         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 512                 err = dsa_slave_port_vlan_del(dev,
 513                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 514                 break;
 515         default:
 516                 err = -EOPNOTSUPP;
 517                 break;
 518         }
 519
 520         return err;
 521 }
 522
 523 static int dsa_slave_port_obj_dump(struct net_device *dev,
 524                                    struct switchdev_obj *obj,
 525                                    switchdev_obj_dump_cb_t *cb)
 526 {
 527         int err;
 528
 529         switch (obj->id) {
 530         case SWITCHDEV_OBJ_ID_PORT_FDB:
 531                 err = dsa_slave_port_fdb_dump(dev,
 532                                               SWITCHDEV_OBJ_PORT_FDB(obj),
 533                                               cb);
 534                 break;
 535         case SWITCHDEV_OBJ_ID_PORT_MDB:
 536                 err = dsa_slave_port_mdb_dump(dev, SWITCHDEV_OBJ_PORT_MDB(obj),
 537                                               cb);
 538                 break;
 539         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 540                 err = dsa_slave_port_vlan_dump(dev,
 541                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 542                                                cb);
 543                 break;
 544         default:
 545                 err = -EOPNOTSUPP;
 546                 break;
 547         }
 548
 549         return err;
 550 }
 551
 552 static int dsa_slave_bridge_port_join(struct net_device *dev,
 553                                       struct net_device *br)
 554 {
 555         struct dsa_slave_priv *p = netdev_priv(dev);
 556         struct dsa_switch *ds = p->parent;
 557         int ret = -EOPNOTSUPP;
 558
 559         p->bridge_dev = br;
 560
 561         if (ds->ops->port_bridge_join)
 562                 ret = ds->ops->port_bridge_join(ds, p->port, br);
 563
 564         return ret == -EOPNOTSUPP ? 0 : ret;
 565 }
 566
 567 static void dsa_slave_bridge_port_leave(struct net_device *dev)
 568 {
 569         struct dsa_slave_priv *p = netdev_priv(dev);
 570         struct dsa_switch *ds = p->parent;
 571
 572
 573         if (ds->ops->port_bridge_leave)
 574                 ds->ops->port_bridge_leave(ds, p->port);
 575
 576         p->bridge_dev = NULL;
 577
 578         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 579          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 580          */
 581         dsa_port_set_stp_state(ds, p->port, BR_STATE_FORWARDING);
 582 }
 583
 584 static int dsa_slave_port_attr_get(struct net_device *dev,
 585                                    struct switchdev_attr *attr)
 586 {
 587         struct dsa_slave_priv *p = netdev_priv(dev);
 588         struct dsa_switch *ds = p->parent;
 589
 590         switch (attr->id) {
 591         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 592                 attr->u.ppid.id_len = sizeof(ds->index);
 593                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 594                 break;
 595         default:
 596                 return -EOPNOTSUPP;
 597         }
 598
 599         return 0;
 600 }
 601
 602 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 603                                                struct sk_buff *skb)
 604 {
 605 #ifdef CONFIG_NET_POLL_CONTROLLER
 606         if (p->netpoll)
 607                 netpoll_send_skb(p->netpoll, skb);
 608 #else
 609         BUG();
 610 #endif
 611         return NETDEV_TX_OK;
 612 }
 613
 614 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 615 {
 616         struct dsa_slave_priv *p = netdev_priv(dev);
 617         struct sk_buff *nskb;
 618
 619         dev->stats.tx_packets++;
 620         dev->stats.tx_bytes += skb->len;
 621
 622         /* Transmit function may have to reallocate the original SKB */
 623         nskb = p->xmit(skb, dev);
 624         if (!nskb)
 625                 return NETDEV_TX_OK;
 626
 627         /* SKB for netpoll still need to be mangled with the protocol-specific
 628          * tag to be successfully transmitted
 629          */
 630         if (unlikely(netpoll_tx_running(dev)))
 631                 return dsa_netpoll_send_skb(p, nskb);
 632
 633         /* Queue the SKB for transmission on the parent interface, but
 634          * do not modify its EtherType
 635          */
 636         nskb->dev = p->parent->dst->master_netdev;
 637         dev_queue_xmit(nskb);
 638
 639         return NETDEV_TX_OK;
 640 }
 641
 642 /* ethtool operations *******************************************************/
 643 static int
 644 dsa_slave_get_link_ksettings(struct net_device *dev,
 645                              struct ethtool_link_ksettings *cmd)
 646 {
 647         struct dsa_slave_priv *p = netdev_priv(dev);
 648         int err;
 649
 650         err = -EOPNOTSUPP;
 651         if (p->phy != NULL) {
 652                 err = phy_read_status(p->phy);
 653                 if (err == 0)
 654                         err = phy_ethtool_ksettings_get(p->phy, cmd);
 655         }
 656
 657         return err;
 658 }
 659
 660 static int
 661 dsa_slave_set_link_ksettings(struct net_device *dev,
 662                              const struct ethtool_link_ksettings *cmd)
 663 {
 664         struct dsa_slave_priv *p = netdev_priv(dev);
 665
 666         if (p->phy != NULL)
 667                 return phy_ethtool_ksettings_set(p->phy, cmd);
 668
 669         return -EOPNOTSUPP;
 670 }
 671
 672 static void dsa_slave_get_drvinfo(struct net_device *dev,
 673                                   struct ethtool_drvinfo *drvinfo)
 674 {
 675         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 676         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 677         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 678         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 679 }
 680
 681 static int dsa_slave_get_regs_len(struct net_device *dev)
 682 {
 683         struct dsa_slave_priv *p = netdev_priv(dev);
 684         struct dsa_switch *ds = p->parent;
 685
 686         if (ds->ops->get_regs_len)
 687                 return ds->ops->get_regs_len(ds, p->port);
 688
 689         return -EOPNOTSUPP;
 690 }
 691
 692 static void
 693 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 694 {
 695         struct dsa_slave_priv *p = netdev_priv(dev);
 696         struct dsa_switch *ds = p->parent;
 697
 698         if (ds->ops->get_regs)
 699                 ds->ops->get_regs(ds, p->port, regs, _p);
 700 }
 701
 702 static int dsa_slave_nway_reset(struct net_device *dev)
 703 {
 704         struct dsa_slave_priv *p = netdev_priv(dev);
 705
 706         if (p->phy != NULL)
 707                 return genphy_restart_aneg(p->phy);
 708
 709         return -EOPNOTSUPP;
 710 }
 711
 712 static u32 dsa_slave_get_link(struct net_device *dev)
 713 {
 714         struct dsa_slave_priv *p = netdev_priv(dev);
 715
 716         if (p->phy != NULL) {
 717                 genphy_update_link(p->phy);
 718                 return p->phy->link;
 719         }
 720
 721         return -EOPNOTSUPP;
 722 }
 723
 724 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 725 {
 726         struct dsa_slave_priv *p = netdev_priv(dev);
 727         struct dsa_switch *ds = p->parent;
 728
 729         if (ds->cd && ds->cd->eeprom_len)
 730                 return ds->cd->eeprom_len;
 731
 732         if (ds->ops->get_eeprom_len)
 733                 return ds->ops->get_eeprom_len(ds);
 734
 735         return 0;
 736 }
 737
 738 static int dsa_slave_get_eeprom(struct net_device *dev,
 739                                 struct ethtool_eeprom *eeprom, u8 *data)
 740 {
 741         struct dsa_slave_priv *p = netdev_priv(dev);
 742         struct dsa_switch *ds = p->parent;
 743
 744         if (ds->ops->get_eeprom)
 745                 return ds->ops->get_eeprom(ds, eeprom, data);
 746
 747         return -EOPNOTSUPP;
 748 }
 749
 750 static int dsa_slave_set_eeprom(struct net_device *dev,
 751                                 struct ethtool_eeprom *eeprom, u8 *data)
 752 {
 753         struct dsa_slave_priv *p = netdev_priv(dev);
 754         struct dsa_switch *ds = p->parent;
 755
 756         if (ds->ops->set_eeprom)
 757                 return ds->ops->set_eeprom(ds, eeprom, data);
 758
 759         return -EOPNOTSUPP;
 760 }
 761
 762 static void dsa_slave_get_strings(struct net_device *dev,
 763                                   uint32_t stringset, uint8_t *data)
 764 {
 765         struct dsa_slave_priv *p = netdev_priv(dev);
 766         struct dsa_switch *ds = p->parent;
 767
 768         if (stringset == ETH_SS_STATS) {
 769                 int len = ETH_GSTRING_LEN;
 770
 771                 strncpy(data, "tx_packets", len);
 772                 strncpy(data + len, "tx_bytes", len);
 773                 strncpy(data + 2 * len, "rx_packets", len);
 774                 strncpy(data + 3 * len, "rx_bytes", len);
 775                 if (ds->ops->get_strings)
 776                         ds->ops->get_strings(ds, p->port, data + 4 * len);
 777         }
 778 }
 779
 780 static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
 781                                            struct ethtool_stats *stats,
 782                                            uint64_t *data)
 783 {
 784         struct dsa_switch_tree *dst = dev->dsa_ptr;
 785         struct dsa_switch *ds = dst->ds[0];
 786         s8 cpu_port = dst->cpu_port;
 787         int count = 0;
 788
 789         if (dst->master_ethtool_ops.get_sset_count) {
 790                 count = dst->master_ethtool_ops.get_sset_count(dev,
 791                                                                ETH_SS_STATS);
 792                 dst->master_ethtool_ops.get_ethtool_stats(dev, stats, data);
 793         }
 794
 795         if (ds->ops->get_ethtool_stats)
 796                 ds->ops->get_ethtool_stats(ds, cpu_port, data + count);
 797 }
 798
 799 static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
 800 {
 801         struct dsa_switch_tree *dst = dev->dsa_ptr;
 802         struct dsa_switch *ds = dst->ds[0];
 803         int count = 0;
 804
 805         if (dst->master_ethtool_ops.get_sset_count)
 806                 count += dst->master_ethtool_ops.get_sset_count(dev, sset);
 807
 808         if (sset == ETH_SS_STATS && ds->ops->get_sset_count)
 809                 count += ds->ops->get_sset_count(ds);
 810
 811         return count;
 812 }
 813
 814 static void dsa_cpu_port_get_strings(struct net_device *dev,
 815                                      uint32_t stringset, uint8_t *data)
 816 {
 817         struct dsa_switch_tree *dst = dev->dsa_ptr;
 818         struct dsa_switch *ds = dst->ds[0];
 819         s8 cpu_port = dst->cpu_port;
 820         int len = ETH_GSTRING_LEN;
 821         int mcount = 0, count;
 822         unsigned int i;
 823         uint8_t pfx[4];
 824         uint8_t *ndata;
 825
 826         snprintf(pfx, sizeof(pfx), "p%.2d", cpu_port);
 827         /* We do not want to be NULL-terminated, since this is a prefix */
 828         pfx[sizeof(pfx) - 1] = '_';
 829
 830         if (dst->master_ethtool_ops.get_sset_count) {
 831                 mcount = dst->master_ethtool_ops.get_sset_count(dev,
 832                                                                 ETH_SS_STATS);
 833                 dst->master_ethtool_ops.get_strings(dev, stringset, data);
 834         }
 835
 836         if (stringset == ETH_SS_STATS && ds->ops->get_strings) {
 837                 ndata = data + mcount * len;
 838                 /* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
 839                  * the output after to prepend our CPU port prefix we
 840                  * constructed earlier
 841                  */
 842                 ds->ops->get_strings(ds, cpu_port, ndata);
 843                 count = ds->ops->get_sset_count(ds);
 844                 for (i = 0; i < count; i++) {
 845                         memmove(ndata + (i * len + sizeof(pfx)),
 846                                 ndata + i * len, len - sizeof(pfx));
 847                         memcpy(ndata + i * len, pfx, sizeof(pfx));
 848                 }
 849         }
 850 }
 851
 852 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 853                                         struct ethtool_stats *stats,
 854                                         uint64_t *data)
 855 {
 856         struct dsa_slave_priv *p = netdev_priv(dev);
 857         struct dsa_switch *ds = p->parent;
 858
 859         data[0] = dev->stats.tx_packets;
 860         data[1] = dev->stats.tx_bytes;
 861         data[2] = dev->stats.rx_packets;
 862         data[3] = dev->stats.rx_bytes;
 863         if (ds->ops->get_ethtool_stats)
 864                 ds->ops->get_ethtool_stats(ds, p->port, data + 4);
 865 }
 866
 867 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 868 {
 869         struct dsa_slave_priv *p = netdev_priv(dev);
 870         struct dsa_switch *ds = p->parent;
 871
 872         if (sset == ETH_SS_STATS) {
 873                 int count;
 874
 875                 count = 4;
 876                 if (ds->ops->get_sset_count)
 877                         count += ds->ops->get_sset_count(ds);
 878
 879                 return count;
 880         }
 881
 882         return -EOPNOTSUPP;
 883 }
 884
 885 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 886 {
 887         struct dsa_slave_priv *p = netdev_priv(dev);
 888         struct dsa_switch *ds = p->parent;
 889
 890         if (ds->ops->get_wol)
 891                 ds->ops->get_wol(ds, p->port, w);
 892 }
 893
 894 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 895 {
 896         struct dsa_slave_priv *p = netdev_priv(dev);
 897         struct dsa_switch *ds = p->parent;
 898         int ret = -EOPNOTSUPP;
 899
 900         if (ds->ops->set_wol)
 901                 ret = ds->ops->set_wol(ds, p->port, w);
 902
 903         return ret;
 904 }
 905
 906 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 907 {
 908         struct dsa_slave_priv *p = netdev_priv(dev);
 909         struct dsa_switch *ds = p->parent;
 910         int ret;
 911
 912         if (!ds->ops->set_eee)
 913                 return -EOPNOTSUPP;
 914
 915         ret = ds->ops->set_eee(ds, p->port, p->phy, e);
 916         if (ret)
 917                 return ret;
 918
 919         if (p->phy)
 920                 ret = phy_ethtool_set_eee(p->phy, e);
 921
 922         return ret;
 923 }
 924
 925 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 926 {
 927         struct dsa_slave_priv *p = netdev_priv(dev);
 928         struct dsa_switch *ds = p->parent;
 929         int ret;
 930
 931         if (!ds->ops->get_eee)
 932                 return -EOPNOTSUPP;
 933
 934         ret = ds->ops->get_eee(ds, p->port, e);
 935         if (ret)
 936                 return ret;
 937
 938         if (p->phy)
 939                 ret = phy_ethtool_get_eee(p->phy, e);
 940
 941         return ret;
 942 }
 943
 944 #ifdef CONFIG_NET_POLL_CONTROLLER
 945 static int dsa_slave_netpoll_setup(struct net_device *dev,
 946                                    struct netpoll_info *ni)
 947 {
 948         struct dsa_slave_priv *p = netdev_priv(dev);
 949         struct dsa_switch *ds = p->parent;
 950         struct net_device *master = ds->dst->master_netdev;
 951         struct netpoll *netpoll;
 952         int err = 0;
 953
 954         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 955         if (!netpoll)
 956                 return -ENOMEM;
 957
 958         err = __netpoll_setup(netpoll, master);
 959         if (err) {
 960                 kfree(netpoll);
 961                 goto out;
 962         }
 963
 964         p->netpoll = netpoll;
 965 out:
 966         return err;
 967 }
 968
 969 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 970 {
 971         struct dsa_slave_priv *p = netdev_priv(dev);
 972         struct netpoll *netpoll = p->netpoll;
 973
 974         if (!netpoll)
 975                 return;
 976
 977         p->netpoll = NULL;
 978
 979         __netpoll_free_async(netpoll);
 980 }
 981
 982 static void dsa_slave_poll_controller(struct net_device *dev)
 983 {
 984 }
 985 #endif
 986
 987 void dsa_cpu_port_ethtool_init(struct ethtool_ops *ops)
 988 {
 989         ops->get_sset_count = dsa_cpu_port_get_sset_count;
 990         ops->get_ethtool_stats = dsa_cpu_port_get_ethtool_stats;
 991         ops->get_strings = dsa_cpu_port_get_strings;
 992 }
 993
 994 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 995         .get_drvinfo            = dsa_slave_get_drvinfo,
 996         .get_regs_len           = dsa_slave_get_regs_len,
 997         .get_regs               = dsa_slave_get_regs,
 998         .nway_reset             = dsa_slave_nway_reset,
 999         .get_link               = dsa_slave_get_link,
1000         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1001         .get_eeprom             = dsa_slave_get_eeprom,
1002         .set_eeprom             = dsa_slave_set_eeprom,
1003         .get_strings            = dsa_slave_get_strings,
1004         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1005         .get_sset_count         = dsa_slave_get_sset_count,
1006         .set_wol                = dsa_slave_set_wol,
1007         .get_wol                = dsa_slave_get_wol,
1008         .set_eee                = dsa_slave_set_eee,
1009         .get_eee                = dsa_slave_get_eee,
1010         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1011         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1012 };
1013
1014 static const struct net_device_ops dsa_slave_netdev_ops = {
1015         .ndo_open               = dsa_slave_open,
1016         .ndo_stop               = dsa_slave_close,
1017         .ndo_start_xmit         = dsa_slave_xmit,
1018         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1019         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1020         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1021         .ndo_fdb_add            = switchdev_port_fdb_add,
1022         .ndo_fdb_del            = switchdev_port_fdb_del,
1023         .ndo_fdb_dump           = switchdev_port_fdb_dump,
1024         .ndo_do_ioctl           = dsa_slave_ioctl,
1025         .ndo_get_iflink         = dsa_slave_get_iflink,
1026 #ifdef CONFIG_NET_POLL_CONTROLLER
1027         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1028         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1029         .ndo_poll_controller    = dsa_slave_poll_controller,
1030 #endif
1031         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
1032         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
1033         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
1034 };
1035
1036 static const struct switchdev_ops dsa_slave_switchdev_ops = {
1037         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
1038         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
1039         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
1040         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
1041         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
1042 };
1043
1044 static struct device_type dsa_type = {
1045         .name   = "dsa",
1046 };
1047
1048 static void dsa_slave_adjust_link(struct net_device *dev)
1049 {
1050         struct dsa_slave_priv *p = netdev_priv(dev);
1051         struct dsa_switch *ds = p->parent;
1052         unsigned int status_changed = 0;
1053
1054         if (p->old_link != p->phy->link) {
1055                 status_changed = 1;
1056                 p->old_link = p->phy->link;
1057         }
1058
1059         if (p->old_duplex != p->phy->duplex) {
1060                 status_changed = 1;
1061                 p->old_duplex = p->phy->duplex;
1062         }
1063
1064         if (p->old_pause != p->phy->pause) {
1065                 status_changed = 1;
1066                 p->old_pause = p->phy->pause;
1067         }
1068
1069         if (ds->ops->adjust_link && status_changed)
1070                 ds->ops->adjust_link(ds, p->port, p->phy);
1071
1072         if (status_changed)
1073                 phy_print_status(p->phy);
1074 }
1075
1076 static int dsa_slave_fixed_link_update(struct net_device *dev,
1077                                        struct fixed_phy_status *status)
1078 {
1079         struct dsa_slave_priv *p;
1080         struct dsa_switch *ds;
1081
1082         if (dev) {
1083                 p = netdev_priv(dev);
1084                 ds = p->parent;
1085                 if (ds->ops->fixed_link_update)
1086                         ds->ops->fixed_link_update(ds, p->port, status);
1087         }
1088
1089         return 0;
1090 }
1091
1092 /* slave device setup *******************************************************/
1093 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
1094                                  struct net_device *slave_dev,
1095                                  int addr)
1096 {
1097         struct dsa_switch *ds = p->parent;
1098
1099         p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
1100         if (!p->phy) {
1101                 netdev_err(slave_dev, "no phy at %d\n", addr);
1102                 return -ENODEV;
1103         }
1104
1105         /* Use already configured phy mode */
1106         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1107                 p->phy_interface = p->phy->interface;
1108         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1109                            p->phy_interface);
1110
1111         return 0;
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 (p->phy) {
1207                 phy_stop(p->phy);
1208                 p->old_pause = -1;
1209                 p->old_link = -1;
1210                 p->old_duplex = -1;
1211                 phy_suspend(p->phy);
1212         }
1213
1214         return 0;
1215 }
1216
1217 int dsa_slave_resume(struct net_device *slave_dev)
1218 {
1219         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1220
1221         netif_device_attach(slave_dev);
1222
1223         if (p->phy) {
1224                 phy_resume(p->phy);
1225                 phy_start(p->phy);
1226         }
1227
1228         return 0;
1229 }
1230
1231 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1232                      int port, const char *name)
1233 {
1234         struct dsa_switch_tree *dst = ds->dst;
1235         struct net_device *master;
1236         struct net_device *slave_dev;
1237         struct dsa_slave_priv *p;
1238         int ret;
1239
1240         master = ds->dst->master_netdev;
1241         if (ds->master_netdev)
1242                 master = ds->master_netdev;
1243
1244         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1245                                  NET_NAME_UNKNOWN, ether_setup);
1246         if (slave_dev == NULL)
1247                 return -ENOMEM;
1248
1249         slave_dev->features = master->vlan_features;
1250         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1251         eth_hw_addr_inherit(slave_dev, master);
1252         slave_dev->priv_flags |= IFF_NO_QUEUE;
1253         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1254         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1255         slave_dev->min_mtu = 0;
1256         slave_dev->max_mtu = ETH_MAX_MTU;
1257         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1258
1259         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1260                                  NULL);
1261
1262         SET_NETDEV_DEV(slave_dev, parent);
1263         slave_dev->dev.of_node = ds->ports[port].dn;
1264         slave_dev->vlan_features = master->vlan_features;
1265
1266         p = netdev_priv(slave_dev);
1267         p->parent = ds;
1268         p->port = port;
1269         p->xmit = dst->tag_ops->xmit;
1270
1271         p->old_pause = -1;
1272         p->old_link = -1;
1273         p->old_duplex = -1;
1274
1275         ds->ports[port].netdev = slave_dev;
1276         ret = register_netdev(slave_dev);
1277         if (ret) {
1278                 netdev_err(master, "error %d registering interface %s\n",
1279                            ret, slave_dev->name);
1280                 ds->ports[port].netdev = NULL;
1281                 free_netdev(slave_dev);
1282                 return ret;
1283         }
1284
1285         netif_carrier_off(slave_dev);
1286
1287         ret = dsa_slave_phy_setup(p, slave_dev);
1288         if (ret) {
1289                 netdev_err(master, "error %d setting up slave phy\n", ret);
1290                 unregister_netdev(slave_dev);
1291                 free_netdev(slave_dev);
1292                 return ret;
1293         }
1294
1295         return 0;
1296 }
1297
1298 void dsa_slave_destroy(struct net_device *slave_dev)
1299 {
1300         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1301         struct dsa_switch *ds = p->parent;
1302         struct device_node *port_dn;
1303
1304         port_dn = ds->ports[p->port].dn;
1305
1306         netif_carrier_off(slave_dev);
1307         if (p->phy) {
1308                 phy_disconnect(p->phy);
1309
1310                 if (of_phy_is_fixed_link(port_dn))
1311                         of_phy_deregister_fixed_link(port_dn);
1312         }
1313         unregister_netdev(slave_dev);
1314         free_netdev(slave_dev);
1315 }
1316
1317 static bool dsa_slave_dev_check(struct net_device *dev)
1318 {
1319         return dev->netdev_ops == &dsa_slave_netdev_ops;
1320 }
1321
1322 static int dsa_slave_port_upper_event(struct net_device *dev,
1323                                       unsigned long event, void *ptr)
1324 {
1325         struct netdev_notifier_changeupper_info *info = ptr;
1326         struct net_device *upper = info->upper_dev;
1327         int err = 0;
1328
1329         switch (event) {
1330         case NETDEV_CHANGEUPPER:
1331                 if (netif_is_bridge_master(upper)) {
1332                         if (info->linking)
1333                                 err = dsa_slave_bridge_port_join(dev, upper);
1334                         else
1335                                 dsa_slave_bridge_port_leave(dev);
1336                 }
1337
1338                 break;
1339         }
1340
1341         return notifier_from_errno(err);
1342 }
1343
1344 static int dsa_slave_port_event(struct net_device *dev, unsigned long event,
1345                                 void *ptr)
1346 {
1347         switch (event) {
1348         case NETDEV_CHANGEUPPER:
1349                 return dsa_slave_port_upper_event(dev, event, ptr);
1350         }
1351
1352         return NOTIFY_DONE;
1353 }
1354
1355 int dsa_slave_netdevice_event(struct notifier_block *unused,
1356                               unsigned long event, void *ptr)
1357 {
1358         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1359
1360         if (dsa_slave_dev_check(dev))
1361                 return dsa_slave_port_event(dev, event, ptr);
1362
1363         return NOTIFY_DONE;
1364 }