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->dp->ds->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->dp->ds->dst->master_netdev;
 100         struct dsa_switch *ds = p->dp->ds;
 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->dp->index, p->phy);
 127                 if (err)
 128                         goto clear_promisc;
 129         }
 130
 131         dsa_port_set_stp_state(ds, p->dp->index, 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->dp->ds->dst->master_netdev;
 155         struct dsa_switch *ds = p->dp->ds;
 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->dp->index, p->phy);
 172
 173         dsa_port_set_stp_state(ds, p->dp->index, 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->dp->ds->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->dp->ds->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->dp->ds->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_port *dp = p->dp;
 232         struct dsa_switch *ds = dp->ds;
 233
 234         if (switchdev_trans_ph_prepare(trans)) {
 235                 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
 236                         return -EOPNOTSUPP;
 237
 238                 return ds->ops->port_vlan_prepare(ds, dp->index, vlan, trans);
 239         }
 240
 241         ds->ops->port_vlan_add(ds, dp->index, vlan, trans);
 242
 243         return 0;
 244 }
 245
 246 static int dsa_slave_port_vlan_del(struct net_device *dev,
 247                                    const struct switchdev_obj_port_vlan *vlan)
 248 {
 249         struct dsa_slave_priv *p = netdev_priv(dev);
 250         struct dsa_switch *ds = p->dp->ds;
 251
 252         if (!ds->ops->port_vlan_del)
 253                 return -EOPNOTSUPP;
 254
 255         return ds->ops->port_vlan_del(ds, p->dp->index, vlan);
 256 }
 257
 258 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 259                                     struct switchdev_obj_port_vlan *vlan,
 260                                     switchdev_obj_dump_cb_t *cb)
 261 {
 262         struct dsa_slave_priv *p = netdev_priv(dev);
 263         struct dsa_switch *ds = p->dp->ds;
 264
 265         if (ds->ops->port_vlan_dump)
 266                 return ds->ops->port_vlan_dump(ds, p->dp->index, vlan, cb);
 267
 268         return -EOPNOTSUPP;
 269 }
 270
 271 static int dsa_slave_port_fdb_add(struct net_device *dev,
 272                                   const struct switchdev_obj_port_fdb *fdb,
 273                                   struct switchdev_trans *trans)
 274 {
 275         struct dsa_slave_priv *p = netdev_priv(dev);
 276         struct dsa_switch *ds = p->dp->ds;
 277
 278         if (switchdev_trans_ph_prepare(trans)) {
 279                 if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add)
 280                         return -EOPNOTSUPP;
 281
 282                 return ds->ops->port_fdb_prepare(ds, p->dp->index, fdb, trans);
 283         }
 284
 285         ds->ops->port_fdb_add(ds, p->dp->index, fdb, trans);
 286
 287         return 0;
 288 }
 289
 290 static int dsa_slave_port_fdb_del(struct net_device *dev,
 291                                   const struct switchdev_obj_port_fdb *fdb)
 292 {
 293         struct dsa_slave_priv *p = netdev_priv(dev);
 294         struct dsa_switch *ds = p->dp->ds;
 295         int ret = -EOPNOTSUPP;
 296
 297         if (ds->ops->port_fdb_del)
 298                 ret = ds->ops->port_fdb_del(ds, p->dp->index, fdb);
 299
 300         return ret;
 301 }
 302
 303 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 304                                    struct switchdev_obj_port_fdb *fdb,
 305                                    switchdev_obj_dump_cb_t *cb)
 306 {
 307         struct dsa_slave_priv *p = netdev_priv(dev);
 308         struct dsa_switch *ds = p->dp->ds;
 309
 310         if (ds->ops->port_fdb_dump)
 311                 return ds->ops->port_fdb_dump(ds, p->dp->index, fdb, cb);
 312
 313         return -EOPNOTSUPP;
 314 }
 315
 316 static int dsa_slave_port_mdb_add(struct net_device *dev,
 317                                   const struct switchdev_obj_port_mdb *mdb,
 318                                   struct switchdev_trans *trans)
 319 {
 320         struct dsa_slave_priv *p = netdev_priv(dev);
 321         struct dsa_switch *ds = p->dp->ds;
 322
 323         if (switchdev_trans_ph_prepare(trans)) {
 324                 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
 325                         return -EOPNOTSUPP;
 326
 327                 return ds->ops->port_mdb_prepare(ds, p->dp->index, mdb, trans);
 328         }
 329
 330         ds->ops->port_mdb_add(ds, p->dp->index, mdb, trans);
 331
 332         return 0;
 333 }
 334
 335 static int dsa_slave_port_mdb_del(struct net_device *dev,
 336                                   const struct switchdev_obj_port_mdb *mdb)
 337 {
 338         struct dsa_slave_priv *p = netdev_priv(dev);
 339         struct dsa_switch *ds = p->dp->ds;
 340
 341         if (ds->ops->port_mdb_del)
 342                 return ds->ops->port_mdb_del(ds, p->dp->index, mdb);
 343
 344         return -EOPNOTSUPP;
 345 }
 346
 347 static int dsa_slave_port_mdb_dump(struct net_device *dev,
 348                                    struct switchdev_obj_port_mdb *mdb,
 349                                    switchdev_obj_dump_cb_t *cb)
 350 {
 351         struct dsa_slave_priv *p = netdev_priv(dev);
 352         struct dsa_switch *ds = p->dp->ds;
 353
 354         if (ds->ops->port_mdb_dump)
 355                 return ds->ops->port_mdb_dump(ds, p->dp->index, mdb, cb);
 356
 357         return -EOPNOTSUPP;
 358 }
 359
 360 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 361 {
 362         struct dsa_slave_priv *p = netdev_priv(dev);
 363
 364         if (p->phy != NULL)
 365                 return phy_mii_ioctl(p->phy, ifr, cmd);
 366
 367         return -EOPNOTSUPP;
 368 }
 369
 370 static int dsa_slave_stp_state_set(struct net_device *dev,
 371                                    const struct switchdev_attr *attr,
 372                                    struct switchdev_trans *trans)
 373 {
 374         struct dsa_slave_priv *p = netdev_priv(dev);
 375         struct dsa_switch *ds = p->dp->ds;
 376
 377         if (switchdev_trans_ph_prepare(trans))
 378                 return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;
 379
 380         dsa_port_set_stp_state(ds, p->dp->index, attr->u.stp_state);
 381
 382         return 0;
 383 }
 384
 385 static int dsa_slave_vlan_filtering(struct net_device *dev,
 386                                     const struct switchdev_attr *attr,
 387                                     struct switchdev_trans *trans)
 388 {
 389         struct dsa_slave_priv *p = netdev_priv(dev);
 390         struct dsa_switch *ds = p->dp->ds;
 391
 392         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 393         if (switchdev_trans_ph_prepare(trans))
 394                 return 0;
 395
 396         if (ds->ops->port_vlan_filtering)
 397                 return ds->ops->port_vlan_filtering(ds, p->dp->index,
 398                                                     attr->u.vlan_filtering);
 399
 400         return 0;
 401 }
 402
 403 static int dsa_fastest_ageing_time(struct dsa_switch *ds,
 404                                    unsigned int ageing_time)
 405 {
 406         int i;
 407
 408         for (i = 0; i < ds->num_ports; ++i) {
 409                 struct dsa_port *dp = &ds->ports[i];
 410
 411                 if (dp && dp->ageing_time && dp->ageing_time < ageing_time)
 412                         ageing_time = dp->ageing_time;
 413         }
 414
 415         return ageing_time;
 416 }
 417
 418 static int dsa_slave_ageing_time(struct net_device *dev,
 419                                  const struct switchdev_attr *attr,
 420                                  struct switchdev_trans *trans)
 421 {
 422         struct dsa_slave_priv *p = netdev_priv(dev);
 423         struct dsa_switch *ds = p->dp->ds;
 424         unsigned long ageing_jiffies = clock_t_to_jiffies(attr->u.ageing_time);
 425         unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
 426
 427         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 428         if (switchdev_trans_ph_prepare(trans))
 429                 return 0;
 430
 431         /* Keep the fastest ageing time in case of multiple bridges */
 432         p->dp->ageing_time = ageing_time;
 433         ageing_time = dsa_fastest_ageing_time(ds, ageing_time);
 434
 435         if (ds->ops->set_ageing_time)
 436                 return ds->ops->set_ageing_time(ds, ageing_time);
 437
 438         return 0;
 439 }
 440
 441 static int dsa_slave_port_attr_set(struct net_device *dev,
 442                                    const struct switchdev_attr *attr,
 443                                    struct switchdev_trans *trans)
 444 {
 445         int ret;
 446
 447         switch (attr->id) {
 448         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 449                 ret = dsa_slave_stp_state_set(dev, attr, trans);
 450                 break;
 451         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 452                 ret = dsa_slave_vlan_filtering(dev, attr, trans);
 453                 break;
 454         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 455                 ret = dsa_slave_ageing_time(dev, attr, trans);
 456                 break;
 457         default:
 458                 ret = -EOPNOTSUPP;
 459                 break;
 460         }
 461
 462         return ret;
 463 }
 464
 465 static int dsa_slave_port_obj_add(struct net_device *dev,
 466                                   const struct switchdev_obj *obj,
 467                                   struct switchdev_trans *trans)
 468 {
 469         int err;
 470
 471         /* For the prepare phase, ensure the full set of changes is feasable in
 472          * one go in order to signal a failure properly. If an operation is not
 473          * supported, return -EOPNOTSUPP.
 474          */
 475
 476         switch (obj->id) {
 477         case SWITCHDEV_OBJ_ID_PORT_FDB:
 478                 err = dsa_slave_port_fdb_add(dev,
 479                                              SWITCHDEV_OBJ_PORT_FDB(obj),
 480                                              trans);
 481                 break;
 482         case SWITCHDEV_OBJ_ID_PORT_MDB:
 483                 err = dsa_slave_port_mdb_add(dev, SWITCHDEV_OBJ_PORT_MDB(obj),
 484                                              trans);
 485                 break;
 486         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 487                 err = dsa_slave_port_vlan_add(dev,
 488                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 489                                               trans);
 490                 break;
 491         default:
 492                 err = -EOPNOTSUPP;
 493                 break;
 494         }
 495
 496         return err;
 497 }
 498
 499 static int dsa_slave_port_obj_del(struct net_device *dev,
 500                                   const struct switchdev_obj *obj)
 501 {
 502         int err;
 503
 504         switch (obj->id) {
 505         case SWITCHDEV_OBJ_ID_PORT_FDB:
 506                 err = dsa_slave_port_fdb_del(dev,
 507                                              SWITCHDEV_OBJ_PORT_FDB(obj));
 508                 break;
 509         case SWITCHDEV_OBJ_ID_PORT_MDB:
 510                 err = dsa_slave_port_mdb_del(dev, SWITCHDEV_OBJ_PORT_MDB(obj));
 511                 break;
 512         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 513                 err = dsa_slave_port_vlan_del(dev,
 514                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 515                 break;
 516         default:
 517                 err = -EOPNOTSUPP;
 518                 break;
 519         }
 520
 521         return err;
 522 }
 523
 524 static int dsa_slave_port_obj_dump(struct net_device *dev,
 525                                    struct switchdev_obj *obj,
 526                                    switchdev_obj_dump_cb_t *cb)
 527 {
 528         int err;
 529
 530         switch (obj->id) {
 531         case SWITCHDEV_OBJ_ID_PORT_FDB:
 532                 err = dsa_slave_port_fdb_dump(dev,
 533                                               SWITCHDEV_OBJ_PORT_FDB(obj),
 534                                               cb);
 535                 break;
 536         case SWITCHDEV_OBJ_ID_PORT_MDB:
 537                 err = dsa_slave_port_mdb_dump(dev, SWITCHDEV_OBJ_PORT_MDB(obj),
 538                                               cb);
 539                 break;
 540         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 541                 err = dsa_slave_port_vlan_dump(dev,
 542                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 543                                                cb);
 544                 break;
 545         default:
 546                 err = -EOPNOTSUPP;
 547                 break;
 548         }
 549
 550         return err;
 551 }
 552
 553 static int dsa_slave_bridge_port_join(struct net_device *dev,
 554                                       struct net_device *br)
 555 {
 556         struct dsa_slave_priv *p = netdev_priv(dev);
 557         struct dsa_switch *ds = p->dp->ds;
 558         int ret = -EOPNOTSUPP;
 559
 560         p->bridge_dev = br;
 561
 562         if (ds->ops->port_bridge_join)
 563                 ret = ds->ops->port_bridge_join(ds, p->dp->index, br);
 564
 565         return ret == -EOPNOTSUPP ? 0 : ret;
 566 }
 567
 568 static void dsa_slave_bridge_port_leave(struct net_device *dev)
 569 {
 570         struct dsa_slave_priv *p = netdev_priv(dev);
 571         struct dsa_switch *ds = p->dp->ds;
 572
 573
 574         if (ds->ops->port_bridge_leave)
 575                 ds->ops->port_bridge_leave(ds, p->dp->index);
 576
 577         p->bridge_dev = NULL;
 578
 579         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 580          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 581          */
 582         dsa_port_set_stp_state(ds, p->dp->index, BR_STATE_FORWARDING);
 583 }
 584
 585 static int dsa_slave_port_attr_get(struct net_device *dev,
 586                                    struct switchdev_attr *attr)
 587 {
 588         struct dsa_slave_priv *p = netdev_priv(dev);
 589         struct dsa_switch *ds = p->dp->ds;
 590
 591         switch (attr->id) {
 592         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 593                 attr->u.ppid.id_len = sizeof(ds->index);
 594                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 595                 break;
 596         default:
 597                 return -EOPNOTSUPP;
 598         }
 599
 600         return 0;
 601 }
 602
 603 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 604                                                struct sk_buff *skb)
 605 {
 606 #ifdef CONFIG_NET_POLL_CONTROLLER
 607         if (p->netpoll)
 608                 netpoll_send_skb(p->netpoll, skb);
 609 #else
 610         BUG();
 611 #endif
 612         return NETDEV_TX_OK;
 613 }
 614
 615 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 616 {
 617         struct dsa_slave_priv *p = netdev_priv(dev);
 618         struct sk_buff *nskb;
 619
 620         dev->stats.tx_packets++;
 621         dev->stats.tx_bytes += skb->len;
 622
 623         /* Transmit function may have to reallocate the original SKB */
 624         nskb = p->xmit(skb, dev);
 625         if (!nskb)
 626                 return NETDEV_TX_OK;
 627
 628         /* SKB for netpoll still need to be mangled with the protocol-specific
 629          * tag to be successfully transmitted
 630          */
 631         if (unlikely(netpoll_tx_running(dev)))
 632                 return dsa_netpoll_send_skb(p, nskb);
 633
 634         /* Queue the SKB for transmission on the parent interface, but
 635          * do not modify its EtherType
 636          */
 637         nskb->dev = p->dp->ds->dst->master_netdev;
 638         dev_queue_xmit(nskb);
 639
 640         return NETDEV_TX_OK;
 641 }
 642
 643 /* ethtool operations *******************************************************/
 644 static int
 645 dsa_slave_get_link_ksettings(struct net_device *dev,
 646                              struct ethtool_link_ksettings *cmd)
 647 {
 648         struct dsa_slave_priv *p = netdev_priv(dev);
 649         int err;
 650
 651         err = -EOPNOTSUPP;
 652         if (p->phy != NULL) {
 653                 err = phy_read_status(p->phy);
 654                 if (err == 0)
 655                         err = phy_ethtool_ksettings_get(p->phy, cmd);
 656         }
 657
 658         return err;
 659 }
 660
 661 static int
 662 dsa_slave_set_link_ksettings(struct net_device *dev,
 663                              const struct ethtool_link_ksettings *cmd)
 664 {
 665         struct dsa_slave_priv *p = netdev_priv(dev);
 666
 667         if (p->phy != NULL)
 668                 return phy_ethtool_ksettings_set(p->phy, cmd);
 669
 670         return -EOPNOTSUPP;
 671 }
 672
 673 static void dsa_slave_get_drvinfo(struct net_device *dev,
 674                                   struct ethtool_drvinfo *drvinfo)
 675 {
 676         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 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->dp->ds;
 685
 686         if (ds->ops->get_regs_len)
 687                 return ds->ops->get_regs_len(ds, p->dp->index);
 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->dp->ds;
 697
 698         if (ds->ops->get_regs)
 699                 ds->ops->get_regs(ds, p->dp->index, 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->dp->ds;
 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->dp->ds;
 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->dp->ds;
 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->dp->ds;
 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->dp->index, 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->cpu_switch;
 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->cpu_switch;
 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->cpu_switch;
 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->dp->ds;
 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->dp->index, 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->dp->ds;
 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->dp->ds;
 889
 890         if (ds->ops->get_wol)
 891                 ds->ops->get_wol(ds, p->dp->index, 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->dp->ds;
 898         int ret = -EOPNOTSUPP;
 899
 900         if (ds->ops->set_wol)
 901                 ret = ds->ops->set_wol(ds, p->dp->index, 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->dp->ds;
 910         int ret;
 911
 912         if (!ds->ops->set_eee)
 913                 return -EOPNOTSUPP;
 914
 915         ret = ds->ops->set_eee(ds, p->dp->index, 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->dp->ds;
 929         int ret;
 930
 931         if (!ds->ops->get_eee)
 932                 return -EOPNOTSUPP;
 933
 934         ret = ds->ops->get_eee(ds, p->dp->index, 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->dp->ds;
 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 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 988                                         char *name, size_t len)
 989 {
 990         struct dsa_slave_priv *p = netdev_priv(dev);
 991
 992         if (snprintf(name, len, "p%d", p->dp->index) >= len)
 993                 return -EINVAL;
 994
 995         return 0;
 996 }
 997
 998 void dsa_cpu_port_ethtool_init(struct ethtool_ops *ops)
 999 {
1000         ops->get_sset_count = dsa_cpu_port_get_sset_count;
1001         ops->get_ethtool_stats = dsa_cpu_port_get_ethtool_stats;
1002         ops->get_strings = dsa_cpu_port_get_strings;
1003 }
1004
1005 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1006         .get_drvinfo            = dsa_slave_get_drvinfo,
1007         .get_regs_len           = dsa_slave_get_regs_len,
1008         .get_regs               = dsa_slave_get_regs,
1009         .nway_reset             = dsa_slave_nway_reset,
1010         .get_link               = dsa_slave_get_link,
1011         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1012         .get_eeprom             = dsa_slave_get_eeprom,
1013         .set_eeprom             = dsa_slave_set_eeprom,
1014         .get_strings            = dsa_slave_get_strings,
1015         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1016         .get_sset_count         = dsa_slave_get_sset_count,
1017         .set_wol                = dsa_slave_set_wol,
1018         .get_wol                = dsa_slave_get_wol,
1019         .set_eee                = dsa_slave_set_eee,
1020         .get_eee                = dsa_slave_get_eee,
1021         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1022         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1023 };
1024
1025 static const struct net_device_ops dsa_slave_netdev_ops = {
1026         .ndo_open               = dsa_slave_open,
1027         .ndo_stop               = dsa_slave_close,
1028         .ndo_start_xmit         = dsa_slave_xmit,
1029         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1030         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1031         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1032         .ndo_fdb_add            = switchdev_port_fdb_add,
1033         .ndo_fdb_del            = switchdev_port_fdb_del,
1034         .ndo_fdb_dump           = switchdev_port_fdb_dump,
1035         .ndo_do_ioctl           = dsa_slave_ioctl,
1036         .ndo_get_iflink         = dsa_slave_get_iflink,
1037 #ifdef CONFIG_NET_POLL_CONTROLLER
1038         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1039         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1040         .ndo_poll_controller    = dsa_slave_poll_controller,
1041 #endif
1042         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
1043         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
1044         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
1045         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1046 };
1047
1048 static const struct switchdev_ops dsa_slave_switchdev_ops = {
1049         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
1050         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
1051         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
1052         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
1053         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
1054 };
1055
1056 static struct device_type dsa_type = {
1057         .name   = "dsa",
1058 };
1059
1060 static void dsa_slave_adjust_link(struct net_device *dev)
1061 {
1062         struct dsa_slave_priv *p = netdev_priv(dev);
1063         struct dsa_switch *ds = p->dp->ds;
1064         unsigned int status_changed = 0;
1065
1066         if (p->old_link != p->phy->link) {
1067                 status_changed = 1;
1068                 p->old_link = p->phy->link;
1069         }
1070
1071         if (p->old_duplex != p->phy->duplex) {
1072                 status_changed = 1;
1073                 p->old_duplex = p->phy->duplex;
1074         }
1075
1076         if (p->old_pause != p->phy->pause) {
1077                 status_changed = 1;
1078                 p->old_pause = p->phy->pause;
1079         }
1080
1081         if (ds->ops->adjust_link && status_changed)
1082                 ds->ops->adjust_link(ds, p->dp->index, p->phy);
1083
1084         if (status_changed)
1085                 phy_print_status(p->phy);
1086 }
1087
1088 static int dsa_slave_fixed_link_update(struct net_device *dev,
1089                                        struct fixed_phy_status *status)
1090 {
1091         struct dsa_slave_priv *p;
1092         struct dsa_switch *ds;
1093
1094         if (dev) {
1095                 p = netdev_priv(dev);
1096                 ds = p->dp->ds;
1097                 if (ds->ops->fixed_link_update)
1098                         ds->ops->fixed_link_update(ds, p->dp->index, status);
1099         }
1100
1101         return 0;
1102 }
1103
1104 /* slave device setup *******************************************************/
1105 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
1106                                  struct net_device *slave_dev,
1107                                  int addr)
1108 {
1109         struct dsa_switch *ds = p->dp->ds;
1110
1111         p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
1112         if (!p->phy) {
1113                 netdev_err(slave_dev, "no phy at %d\n", addr);
1114                 return -ENODEV;
1115         }
1116
1117         /* Use already configured phy mode */
1118         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1119                 p->phy_interface = p->phy->interface;
1120         return phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1121                                   p->phy_interface);
1122 }
1123
1124 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1125                                 struct net_device *slave_dev)
1126 {
1127         struct dsa_switch *ds = p->dp->ds;
1128         struct device_node *phy_dn, *port_dn;
1129         bool phy_is_fixed = false;
1130         u32 phy_flags = 0;
1131         int mode, ret;
1132
1133         port_dn = p->dp->dn;
1134         mode = of_get_phy_mode(port_dn);
1135         if (mode < 0)
1136                 mode = PHY_INTERFACE_MODE_NA;
1137         p->phy_interface = mode;
1138
1139         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1140         if (!phy_dn && of_phy_is_fixed_link(port_dn)) {
1141                 /* In the case of a fixed PHY, the DT node associated
1142                  * to the fixed PHY is the Port DT node
1143                  */
1144                 ret = of_phy_register_fixed_link(port_dn);
1145                 if (ret) {
1146                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1147                         return ret;
1148                 }
1149                 phy_is_fixed = true;
1150                 phy_dn = of_node_get(port_dn);
1151         }
1152
1153         if (ds->ops->get_phy_flags)
1154                 phy_flags = ds->ops->get_phy_flags(ds, p->dp->index);
1155
1156         if (phy_dn) {
1157                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1158
1159                 /* If this PHY address is part of phys_mii_mask, which means
1160                  * that we need to divert reads and writes to/from it, then we
1161                  * want to bind this device using the slave MII bus created by
1162                  * DSA to make that happen.
1163                  */
1164                 if (!phy_is_fixed && phy_id >= 0 &&
1165                     (ds->phys_mii_mask & (1 << phy_id))) {
1166                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1167                         if (ret) {
1168                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1169                                 of_node_put(phy_dn);
1170                                 return ret;
1171                         }
1172                 } else {
1173                         p->phy = of_phy_connect(slave_dev, phy_dn,
1174                                                 dsa_slave_adjust_link,
1175                                                 phy_flags,
1176                                                 p->phy_interface);
1177                 }
1178
1179                 of_node_put(phy_dn);
1180         }
1181
1182         if (p->phy && phy_is_fixed)
1183                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1184
1185         /* We could not connect to a designated PHY, so use the switch internal
1186          * MDIO bus instead
1187          */
1188         if (!p->phy) {
1189                 ret = dsa_slave_phy_connect(p, slave_dev, p->dp->index);
1190                 if (ret) {
1191                         netdev_err(slave_dev, "failed to connect to port %d: %d\n",
1192                                    p->dp->index, ret);
1193                         if (phy_is_fixed)
1194                                 of_phy_deregister_fixed_link(port_dn);
1195                         return ret;
1196                 }
1197         }
1198
1199         phy_attached_info(p->phy);
1200
1201         return 0;
1202 }
1203
1204 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1205 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1206                                             struct netdev_queue *txq,
1207                                             void *_unused)
1208 {
1209         lockdep_set_class(&txq->_xmit_lock,
1210                           &dsa_slave_netdev_xmit_lock_key);
1211 }
1212
1213 int dsa_slave_suspend(struct net_device *slave_dev)
1214 {
1215         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1216
1217         netif_device_detach(slave_dev);
1218
1219         if (p->phy) {
1220                 phy_stop(p->phy);
1221                 p->old_pause = -1;
1222                 p->old_link = -1;
1223                 p->old_duplex = -1;
1224                 phy_suspend(p->phy);
1225         }
1226
1227         return 0;
1228 }
1229
1230 int dsa_slave_resume(struct net_device *slave_dev)
1231 {
1232         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1233
1234         netif_device_attach(slave_dev);
1235
1236         if (p->phy) {
1237                 phy_resume(p->phy);
1238                 phy_start(p->phy);
1239         }
1240
1241         return 0;
1242 }
1243
1244 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1245                      int port, const char *name)
1246 {
1247         struct dsa_switch_tree *dst = ds->dst;
1248         struct net_device *master;
1249         struct net_device *slave_dev;
1250         struct dsa_slave_priv *p;
1251         int ret;
1252
1253         master = ds->dst->master_netdev;
1254         if (ds->master_netdev)
1255                 master = ds->master_netdev;
1256
1257         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1258                                  NET_NAME_UNKNOWN, ether_setup);
1259         if (slave_dev == NULL)
1260                 return -ENOMEM;
1261
1262         slave_dev->features = master->vlan_features;
1263         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1264         eth_hw_addr_inherit(slave_dev, master);
1265         slave_dev->priv_flags |= IFF_NO_QUEUE;
1266         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1267         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1268         slave_dev->min_mtu = 0;
1269         slave_dev->max_mtu = ETH_MAX_MTU;
1270         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1271
1272         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1273                                  NULL);
1274
1275         SET_NETDEV_DEV(slave_dev, parent);
1276         slave_dev->dev.of_node = ds->ports[port].dn;
1277         slave_dev->vlan_features = master->vlan_features;
1278
1279         p = netdev_priv(slave_dev);
1280         p->dp = &ds->ports[port];
1281         p->xmit = dst->tag_ops->xmit;
1282
1283         p->old_pause = -1;
1284         p->old_link = -1;
1285         p->old_duplex = -1;
1286
1287         ds->ports[port].netdev = slave_dev;
1288         ret = register_netdev(slave_dev);
1289         if (ret) {
1290                 netdev_err(master, "error %d registering interface %s\n",
1291                            ret, slave_dev->name);
1292                 ds->ports[port].netdev = NULL;
1293                 free_netdev(slave_dev);
1294                 return ret;
1295         }
1296
1297         netif_carrier_off(slave_dev);
1298
1299         ret = dsa_slave_phy_setup(p, slave_dev);
1300         if (ret) {
1301                 netdev_err(master, "error %d setting up slave phy\n", ret);
1302                 unregister_netdev(slave_dev);
1303                 free_netdev(slave_dev);
1304                 return ret;
1305         }
1306
1307         return 0;
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 device_node *port_dn;
1314
1315         port_dn = p->dp->dn;
1316
1317         netif_carrier_off(slave_dev);
1318         if (p->phy) {
1319                 phy_disconnect(p->phy);
1320
1321                 if (of_phy_is_fixed_link(port_dn))
1322                         of_phy_deregister_fixed_link(port_dn);
1323         }
1324         unregister_netdev(slave_dev);
1325         free_netdev(slave_dev);
1326 }
1327
1328 static bool dsa_slave_dev_check(struct net_device *dev)
1329 {
1330         return dev->netdev_ops == &dsa_slave_netdev_ops;
1331 }
1332
1333 static int dsa_slave_port_upper_event(struct net_device *dev,
1334                                       unsigned long event, void *ptr)
1335 {
1336         struct netdev_notifier_changeupper_info *info = ptr;
1337         struct net_device *upper = info->upper_dev;
1338         int err = 0;
1339
1340         switch (event) {
1341         case NETDEV_CHANGEUPPER:
1342                 if (netif_is_bridge_master(upper)) {
1343                         if (info->linking)
1344                                 err = dsa_slave_bridge_port_join(dev, upper);
1345                         else
1346                                 dsa_slave_bridge_port_leave(dev);
1347                 }
1348
1349                 break;
1350         }
1351
1352         return notifier_from_errno(err);
1353 }
1354
1355 static int dsa_slave_port_event(struct net_device *dev, unsigned long event,
1356                                 void *ptr)
1357 {
1358         switch (event) {
1359         case NETDEV_CHANGEUPPER:
1360                 return dsa_slave_port_upper_event(dev, event, ptr);
1361         }
1362
1363         return NOTIFY_DONE;
1364 }
1365
1366 int dsa_slave_netdevice_event(struct notifier_block *unused,
1367                               unsigned long event, void *ptr)
1368 {
1369         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1370
1371         if (dsa_slave_dev_check(dev))
1372                 return dsa_slave_port_event(dev, event, ptr);
1373
1374         return NOTIFY_DONE;
1375 }