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 <net/rtnetlink.h>
  19 #include <linux/if_bridge.h>
  20 #include "dsa_priv.h"
  21
  22 /* slave mii_bus handling ***************************************************/
  23 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  24 {
  25         struct dsa_switch *ds = bus->priv;
  26
  27         if (ds->phys_mii_mask & (1 << addr))
  28                 return ds->drv->phy_read(ds, addr, reg);
  29
  30         return 0xffff;
  31 }
  32
  33 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  34 {
  35         struct dsa_switch *ds = bus->priv;
  36
  37         if (ds->phys_mii_mask & (1 << addr))
  38                 return ds->drv->phy_write(ds, addr, reg, val);
  39
  40         return 0;
  41 }
  42
  43 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  44 {
  45         ds->slave_mii_bus->priv = (void *)ds;
  46         ds->slave_mii_bus->name = "dsa slave smi";
  47         ds->slave_mii_bus->read = dsa_slave_phy_read;
  48         ds->slave_mii_bus->write = dsa_slave_phy_write;
  49         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
  50                         ds->index, ds->pd->sw_addr);
  51         ds->slave_mii_bus->parent = ds->master_dev;
  52         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  53 }
  54
  55
  56 /* slave device handling ****************************************************/
  57 static int dsa_slave_init(struct net_device *dev)
  58 {
  59         struct dsa_slave_priv *p = netdev_priv(dev);
  60
  61         dev->iflink = p->parent->dst->master_netdev->ifindex;
  62
  63         return 0;
  64 }
  65
  66 static inline bool dsa_port_is_bridged(struct dsa_slave_priv *p)
  67 {
  68         return !!p->bridge_dev;
  69 }
  70
  71 static int dsa_slave_open(struct net_device *dev)
  72 {
  73         struct dsa_slave_priv *p = netdev_priv(dev);
  74         struct net_device *master = p->parent->dst->master_netdev;
  75         struct dsa_switch *ds = p->parent;
  76         u8 stp_state = dsa_port_is_bridged(p) ?
  77                         BR_STATE_BLOCKING : BR_STATE_FORWARDING;
  78         int err;
  79
  80         if (!(master->flags & IFF_UP))
  81                 return -ENETDOWN;
  82
  83         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  84                 err = dev_uc_add(master, dev->dev_addr);
  85                 if (err < 0)
  86                         goto out;
  87         }
  88
  89         if (dev->flags & IFF_ALLMULTI) {
  90                 err = dev_set_allmulti(master, 1);
  91                 if (err < 0)
  92                         goto del_unicast;
  93         }
  94         if (dev->flags & IFF_PROMISC) {
  95                 err = dev_set_promiscuity(master, 1);
  96                 if (err < 0)
  97                         goto clear_allmulti;
  98         }
  99
 100         if (ds->drv->port_enable) {
 101                 err = ds->drv->port_enable(ds, p->port, p->phy);
 102                 if (err)
 103                         goto clear_promisc;
 104         }
 105
 106         if (ds->drv->port_stp_update)
 107                 ds->drv->port_stp_update(ds, p->port, stp_state);
 108
 109         if (p->phy)
 110                 phy_start(p->phy);
 111
 112         return 0;
 113
 114 clear_promisc:
 115         if (dev->flags & IFF_PROMISC)
 116                 dev_set_promiscuity(master, 0);
 117 clear_allmulti:
 118         if (dev->flags & IFF_ALLMULTI)
 119                 dev_set_allmulti(master, -1);
 120 del_unicast:
 121         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 122                 dev_uc_del(master, dev->dev_addr);
 123 out:
 124         return err;
 125 }
 126
 127 static int dsa_slave_close(struct net_device *dev)
 128 {
 129         struct dsa_slave_priv *p = netdev_priv(dev);
 130         struct net_device *master = p->parent->dst->master_netdev;
 131         struct dsa_switch *ds = p->parent;
 132
 133         if (p->phy)
 134                 phy_stop(p->phy);
 135
 136         dev_mc_unsync(master, dev);
 137         dev_uc_unsync(master, dev);
 138         if (dev->flags & IFF_ALLMULTI)
 139                 dev_set_allmulti(master, -1);
 140         if (dev->flags & IFF_PROMISC)
 141                 dev_set_promiscuity(master, -1);
 142
 143         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 144                 dev_uc_del(master, dev->dev_addr);
 145
 146         if (ds->drv->port_disable)
 147                 ds->drv->port_disable(ds, p->port, p->phy);
 148
 149         if (ds->drv->port_stp_update)
 150                 ds->drv->port_stp_update(ds, p->port, BR_STATE_DISABLED);
 151
 152         return 0;
 153 }
 154
 155 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 156 {
 157         struct dsa_slave_priv *p = netdev_priv(dev);
 158         struct net_device *master = p->parent->dst->master_netdev;
 159
 160         if (change & IFF_ALLMULTI)
 161                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 162         if (change & IFF_PROMISC)
 163                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 164 }
 165
 166 static void dsa_slave_set_rx_mode(struct net_device *dev)
 167 {
 168         struct dsa_slave_priv *p = netdev_priv(dev);
 169         struct net_device *master = p->parent->dst->master_netdev;
 170
 171         dev_mc_sync(master, dev);
 172         dev_uc_sync(master, dev);
 173 }
 174
 175 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 176 {
 177         struct dsa_slave_priv *p = netdev_priv(dev);
 178         struct net_device *master = p->parent->dst->master_netdev;
 179         struct sockaddr *addr = a;
 180         int err;
 181
 182         if (!is_valid_ether_addr(addr->sa_data))
 183                 return -EADDRNOTAVAIL;
 184
 185         if (!(dev->flags & IFF_UP))
 186                 goto out;
 187
 188         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 189                 err = dev_uc_add(master, addr->sa_data);
 190                 if (err < 0)
 191                         return err;
 192         }
 193
 194         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 195                 dev_uc_del(master, dev->dev_addr);
 196
 197 out:
 198         ether_addr_copy(dev->dev_addr, addr->sa_data);
 199
 200         return 0;
 201 }
 202
 203 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 204 {
 205         struct dsa_slave_priv *p = netdev_priv(dev);
 206
 207         if (p->phy != NULL)
 208                 return phy_mii_ioctl(p->phy, ifr, cmd);
 209
 210         return -EOPNOTSUPP;
 211 }
 212
 213 /* Return a bitmask of all ports being currently bridged within a given bridge
 214  * device. Note that on leave, the mask will still return the bitmask of ports
 215  * currently bridged, prior to port removal, and this is exactly what we want.
 216  */
 217 static u32 dsa_slave_br_port_mask(struct dsa_switch *ds,
 218                                   struct net_device *bridge)
 219 {
 220         struct dsa_slave_priv *p;
 221         unsigned int port;
 222         u32 mask = 0;
 223
 224         for (port = 0; port < DSA_MAX_PORTS; port++) {
 225                 if (!dsa_is_port_initialized(ds, port))
 226                         continue;
 227
 228                 p = netdev_priv(ds->ports[port]);
 229
 230                 if (ds->ports[port]->priv_flags & IFF_BRIDGE_PORT &&
 231                     p->bridge_dev == bridge)
 232                         mask |= 1 << port;
 233         }
 234
 235         return mask;
 236 }
 237
 238 static int dsa_slave_stp_update(struct net_device *dev, u8 state)
 239 {
 240         struct dsa_slave_priv *p = netdev_priv(dev);
 241         struct dsa_switch *ds = p->parent;
 242         int ret = -EOPNOTSUPP;
 243
 244         if (ds->drv->port_stp_update)
 245                 ret = ds->drv->port_stp_update(ds, p->port, state);
 246
 247         return ret;
 248 }
 249
 250 static int dsa_slave_bridge_port_join(struct net_device *dev,
 251                                       struct net_device *br)
 252 {
 253         struct dsa_slave_priv *p = netdev_priv(dev);
 254         struct dsa_switch *ds = p->parent;
 255         int ret = -EOPNOTSUPP;
 256
 257         p->bridge_dev = br;
 258
 259         if (ds->drv->port_join_bridge)
 260                 ret = ds->drv->port_join_bridge(ds, p->port,
 261                                                 dsa_slave_br_port_mask(ds, br));
 262
 263         return ret;
 264 }
 265
 266 static int dsa_slave_bridge_port_leave(struct net_device *dev)
 267 {
 268         struct dsa_slave_priv *p = netdev_priv(dev);
 269         struct dsa_switch *ds = p->parent;
 270         int ret = -EOPNOTSUPP;
 271
 272
 273         if (ds->drv->port_leave_bridge)
 274                 ret = ds->drv->port_leave_bridge(ds, p->port,
 275                                                  dsa_slave_br_port_mask(ds, p->bridge_dev));
 276
 277         p->bridge_dev = NULL;
 278
 279         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 280          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 281          */
 282         dsa_slave_stp_update(dev, BR_STATE_FORWARDING);
 283
 284         return ret;
 285 }
 286
 287 static int dsa_slave_parent_id_get(struct net_device *dev,
 288                                    struct netdev_phys_item_id *psid)
 289 {
 290         struct dsa_slave_priv *p = netdev_priv(dev);
 291         struct dsa_switch *ds = p->parent;
 292
 293         psid->id_len = sizeof(ds->index);
 294         memcpy(&psid->id, &ds->index, psid->id_len);
 295
 296         return 0;
 297 }
 298
 299 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 300 {
 301         struct dsa_slave_priv *p = netdev_priv(dev);
 302
 303         return p->xmit(skb, dev);
 304 }
 305
 306 static netdev_tx_t dsa_slave_notag_xmit(struct sk_buff *skb,
 307                                         struct net_device *dev)
 308 {
 309         struct dsa_slave_priv *p = netdev_priv(dev);
 310
 311         skb->dev = p->parent->dst->master_netdev;
 312         dev_queue_xmit(skb);
 313
 314         return NETDEV_TX_OK;
 315 }
 316
 317
 318 /* ethtool operations *******************************************************/
 319 static int
 320 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 321 {
 322         struct dsa_slave_priv *p = netdev_priv(dev);
 323         int err;
 324
 325         err = -EOPNOTSUPP;
 326         if (p->phy != NULL) {
 327                 err = phy_read_status(p->phy);
 328                 if (err == 0)
 329                         err = phy_ethtool_gset(p->phy, cmd);
 330         }
 331
 332         return err;
 333 }
 334
 335 static int
 336 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 337 {
 338         struct dsa_slave_priv *p = netdev_priv(dev);
 339
 340         if (p->phy != NULL)
 341                 return phy_ethtool_sset(p->phy, cmd);
 342
 343         return -EOPNOTSUPP;
 344 }
 345
 346 static void dsa_slave_get_drvinfo(struct net_device *dev,
 347                                   struct ethtool_drvinfo *drvinfo)
 348 {
 349         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 350         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 351         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 352         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 353 }
 354
 355 static int dsa_slave_get_regs_len(struct net_device *dev)
 356 {
 357         struct dsa_slave_priv *p = netdev_priv(dev);
 358         struct dsa_switch *ds = p->parent;
 359
 360         if (ds->drv->get_regs_len)
 361                 return ds->drv->get_regs_len(ds, p->port);
 362
 363         return -EOPNOTSUPP;
 364 }
 365
 366 static void
 367 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 368 {
 369         struct dsa_slave_priv *p = netdev_priv(dev);
 370         struct dsa_switch *ds = p->parent;
 371
 372         if (ds->drv->get_regs)
 373                 ds->drv->get_regs(ds, p->port, regs, _p);
 374 }
 375
 376 static int dsa_slave_nway_reset(struct net_device *dev)
 377 {
 378         struct dsa_slave_priv *p = netdev_priv(dev);
 379
 380         if (p->phy != NULL)
 381                 return genphy_restart_aneg(p->phy);
 382
 383         return -EOPNOTSUPP;
 384 }
 385
 386 static u32 dsa_slave_get_link(struct net_device *dev)
 387 {
 388         struct dsa_slave_priv *p = netdev_priv(dev);
 389
 390         if (p->phy != NULL) {
 391                 genphy_update_link(p->phy);
 392                 return p->phy->link;
 393         }
 394
 395         return -EOPNOTSUPP;
 396 }
 397
 398 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 399 {
 400         struct dsa_slave_priv *p = netdev_priv(dev);
 401         struct dsa_switch *ds = p->parent;
 402
 403         if (ds->pd->eeprom_len)
 404                 return ds->pd->eeprom_len;
 405
 406         if (ds->drv->get_eeprom_len)
 407                 return ds->drv->get_eeprom_len(ds);
 408
 409         return 0;
 410 }
 411
 412 static int dsa_slave_get_eeprom(struct net_device *dev,
 413                                 struct ethtool_eeprom *eeprom, u8 *data)
 414 {
 415         struct dsa_slave_priv *p = netdev_priv(dev);
 416         struct dsa_switch *ds = p->parent;
 417
 418         if (ds->drv->get_eeprom)
 419                 return ds->drv->get_eeprom(ds, eeprom, data);
 420
 421         return -EOPNOTSUPP;
 422 }
 423
 424 static int dsa_slave_set_eeprom(struct net_device *dev,
 425                                 struct ethtool_eeprom *eeprom, u8 *data)
 426 {
 427         struct dsa_slave_priv *p = netdev_priv(dev);
 428         struct dsa_switch *ds = p->parent;
 429
 430         if (ds->drv->set_eeprom)
 431                 return ds->drv->set_eeprom(ds, eeprom, data);
 432
 433         return -EOPNOTSUPP;
 434 }
 435
 436 static void dsa_slave_get_strings(struct net_device *dev,
 437                                   uint32_t stringset, uint8_t *data)
 438 {
 439         struct dsa_slave_priv *p = netdev_priv(dev);
 440         struct dsa_switch *ds = p->parent;
 441
 442         if (stringset == ETH_SS_STATS) {
 443                 int len = ETH_GSTRING_LEN;
 444
 445                 strncpy(data, "tx_packets", len);
 446                 strncpy(data + len, "tx_bytes", len);
 447                 strncpy(data + 2 * len, "rx_packets", len);
 448                 strncpy(data + 3 * len, "rx_bytes", len);
 449                 if (ds->drv->get_strings != NULL)
 450                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 451         }
 452 }
 453
 454 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 455                                         struct ethtool_stats *stats,
 456                                         uint64_t *data)
 457 {
 458         struct dsa_slave_priv *p = netdev_priv(dev);
 459         struct dsa_switch *ds = p->parent;
 460
 461         data[0] = p->dev->stats.tx_packets;
 462         data[1] = p->dev->stats.tx_bytes;
 463         data[2] = p->dev->stats.rx_packets;
 464         data[3] = p->dev->stats.rx_bytes;
 465         if (ds->drv->get_ethtool_stats != NULL)
 466                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 467 }
 468
 469 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 470 {
 471         struct dsa_slave_priv *p = netdev_priv(dev);
 472         struct dsa_switch *ds = p->parent;
 473
 474         if (sset == ETH_SS_STATS) {
 475                 int count;
 476
 477                 count = 4;
 478                 if (ds->drv->get_sset_count != NULL)
 479                         count += ds->drv->get_sset_count(ds);
 480
 481                 return count;
 482         }
 483
 484         return -EOPNOTSUPP;
 485 }
 486
 487 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 488 {
 489         struct dsa_slave_priv *p = netdev_priv(dev);
 490         struct dsa_switch *ds = p->parent;
 491
 492         if (ds->drv->get_wol)
 493                 ds->drv->get_wol(ds, p->port, w);
 494 }
 495
 496 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 497 {
 498         struct dsa_slave_priv *p = netdev_priv(dev);
 499         struct dsa_switch *ds = p->parent;
 500         int ret = -EOPNOTSUPP;
 501
 502         if (ds->drv->set_wol)
 503                 ret = ds->drv->set_wol(ds, p->port, w);
 504
 505         return ret;
 506 }
 507
 508 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 509 {
 510         struct dsa_slave_priv *p = netdev_priv(dev);
 511         struct dsa_switch *ds = p->parent;
 512         int ret;
 513
 514         if (!ds->drv->set_eee)
 515                 return -EOPNOTSUPP;
 516
 517         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 518         if (ret)
 519                 return ret;
 520
 521         if (p->phy)
 522                 ret = phy_ethtool_set_eee(p->phy, e);
 523
 524         return ret;
 525 }
 526
 527 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 528 {
 529         struct dsa_slave_priv *p = netdev_priv(dev);
 530         struct dsa_switch *ds = p->parent;
 531         int ret;
 532
 533         if (!ds->drv->get_eee)
 534                 return -EOPNOTSUPP;
 535
 536         ret = ds->drv->get_eee(ds, p->port, e);
 537         if (ret)
 538                 return ret;
 539
 540         if (p->phy)
 541                 ret = phy_ethtool_get_eee(p->phy, e);
 542
 543         return ret;
 544 }
 545
 546 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 547         .get_settings           = dsa_slave_get_settings,
 548         .set_settings           = dsa_slave_set_settings,
 549         .get_drvinfo            = dsa_slave_get_drvinfo,
 550         .get_regs_len           = dsa_slave_get_regs_len,
 551         .get_regs               = dsa_slave_get_regs,
 552         .nway_reset             = dsa_slave_nway_reset,
 553         .get_link               = dsa_slave_get_link,
 554         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 555         .get_eeprom             = dsa_slave_get_eeprom,
 556         .set_eeprom             = dsa_slave_set_eeprom,
 557         .get_strings            = dsa_slave_get_strings,
 558         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 559         .get_sset_count         = dsa_slave_get_sset_count,
 560         .set_wol                = dsa_slave_set_wol,
 561         .get_wol                = dsa_slave_get_wol,
 562         .set_eee                = dsa_slave_set_eee,
 563         .get_eee                = dsa_slave_get_eee,
 564 };
 565
 566 static const struct net_device_ops dsa_slave_netdev_ops = {
 567         .ndo_init               = dsa_slave_init,
 568         .ndo_open               = dsa_slave_open,
 569         .ndo_stop               = dsa_slave_close,
 570         .ndo_start_xmit         = dsa_slave_xmit,
 571         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 572         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 573         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 574         .ndo_do_ioctl           = dsa_slave_ioctl,
 575         .ndo_switch_parent_id_get = dsa_slave_parent_id_get,
 576         .ndo_switch_port_stp_update = dsa_slave_stp_update,
 577 };
 578
 579 static void dsa_slave_adjust_link(struct net_device *dev)
 580 {
 581         struct dsa_slave_priv *p = netdev_priv(dev);
 582         struct dsa_switch *ds = p->parent;
 583         unsigned int status_changed = 0;
 584
 585         if (p->old_link != p->phy->link) {
 586                 status_changed = 1;
 587                 p->old_link = p->phy->link;
 588         }
 589
 590         if (p->old_duplex != p->phy->duplex) {
 591                 status_changed = 1;
 592                 p->old_duplex = p->phy->duplex;
 593         }
 594
 595         if (p->old_pause != p->phy->pause) {
 596                 status_changed = 1;
 597                 p->old_pause = p->phy->pause;
 598         }
 599
 600         if (ds->drv->adjust_link && status_changed)
 601                 ds->drv->adjust_link(ds, p->port, p->phy);
 602
 603         if (status_changed)
 604                 phy_print_status(p->phy);
 605 }
 606
 607 static int dsa_slave_fixed_link_update(struct net_device *dev,
 608                                        struct fixed_phy_status *status)
 609 {
 610         struct dsa_slave_priv *p = netdev_priv(dev);
 611         struct dsa_switch *ds = p->parent;
 612
 613         if (ds->drv->fixed_link_update)
 614                 ds->drv->fixed_link_update(ds, p->port, status);
 615
 616         return 0;
 617 }
 618
 619 /* slave device setup *******************************************************/
 620 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
 621                                  struct net_device *slave_dev,
 622                                  int addr)
 623 {
 624         struct dsa_switch *ds = p->parent;
 625
 626         p->phy = ds->slave_mii_bus->phy_map[addr];
 627         if (!p->phy)
 628                 return -ENODEV;
 629
 630         /* Use already configured phy mode */
 631         p->phy_interface = p->phy->interface;
 632         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
 633                            p->phy_interface);
 634
 635         return 0;
 636 }
 637
 638 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
 639                                 struct net_device *slave_dev)
 640 {
 641         struct dsa_switch *ds = p->parent;
 642         struct dsa_chip_data *cd = ds->pd;
 643         struct device_node *phy_dn, *port_dn;
 644         bool phy_is_fixed = false;
 645         u32 phy_flags = 0;
 646         int mode, ret;
 647
 648         port_dn = cd->port_dn[p->port];
 649         mode = of_get_phy_mode(port_dn);
 650         if (mode < 0)
 651                 mode = PHY_INTERFACE_MODE_NA;
 652         p->phy_interface = mode;
 653
 654         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
 655         if (of_phy_is_fixed_link(port_dn)) {
 656                 /* In the case of a fixed PHY, the DT node associated
 657                  * to the fixed PHY is the Port DT node
 658                  */
 659                 ret = of_phy_register_fixed_link(port_dn);
 660                 if (ret) {
 661                         netdev_err(slave_dev, "failed to register fixed PHY\n");
 662                         return ret;
 663                 }
 664                 phy_is_fixed = true;
 665                 phy_dn = port_dn;
 666         }
 667
 668         if (ds->drv->get_phy_flags)
 669                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
 670
 671         if (phy_dn) {
 672                 ret = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
 673                 /* If this PHY address is part of phys_mii_mask, which means
 674                  * that we need to divert reads and writes to/from it, then we
 675                  * want to bind this device using the slave MII bus created by
 676                  * DSA to make that happen.
 677                  */
 678                 if (ret >= 0 && (ds->phys_mii_mask & (1 << ret))) {
 679                         ret = dsa_slave_phy_connect(p, slave_dev, ret);
 680                         if (ret)
 681                                 return ret;
 682                 } else {
 683                         p->phy = of_phy_connect(slave_dev, phy_dn,
 684                                                 dsa_slave_adjust_link,
 685                                                 phy_flags,
 686                                                 p->phy_interface);
 687                 }
 688         }
 689
 690         if (p->phy && phy_is_fixed)
 691                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
 692
 693         /* We could not connect to a designated PHY, so use the switch internal
 694          * MDIO bus instead
 695          */
 696         if (!p->phy) {
 697                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
 698                 if (ret)
 699                         return ret;
 700         } else {
 701                 netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
 702                             p->phy->addr, p->phy->drv->name);
 703         }
 704
 705         return 0;
 706 }
 707
 708 int dsa_slave_suspend(struct net_device *slave_dev)
 709 {
 710         struct dsa_slave_priv *p = netdev_priv(slave_dev);
 711
 712         netif_device_detach(slave_dev);
 713
 714         if (p->phy) {
 715                 phy_stop(p->phy);
 716                 p->old_pause = -1;
 717                 p->old_link = -1;
 718                 p->old_duplex = -1;
 719                 phy_suspend(p->phy);
 720         }
 721
 722         return 0;
 723 }
 724
 725 int dsa_slave_resume(struct net_device *slave_dev)
 726 {
 727         struct dsa_slave_priv *p = netdev_priv(slave_dev);
 728
 729         netif_device_attach(slave_dev);
 730
 731         if (p->phy) {
 732                 phy_resume(p->phy);
 733                 phy_start(p->phy);
 734         }
 735
 736         return 0;
 737 }
 738
 739 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 740                      int port, char *name)
 741 {
 742         struct net_device *master = ds->dst->master_netdev;
 743         struct net_device *slave_dev;
 744         struct dsa_slave_priv *p;
 745         int ret;
 746
 747         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
 748                                  NET_NAME_UNKNOWN, ether_setup);
 749         if (slave_dev == NULL)
 750                 return -ENOMEM;
 751
 752         slave_dev->features = master->vlan_features;
 753         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
 754         eth_hw_addr_inherit(slave_dev, master);
 755         slave_dev->tx_queue_len = 0;
 756         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
 757
 758         SET_NETDEV_DEV(slave_dev, parent);
 759         slave_dev->dev.of_node = ds->pd->port_dn[port];
 760         slave_dev->vlan_features = master->vlan_features;
 761
 762         p = netdev_priv(slave_dev);
 763         p->dev = slave_dev;
 764         p->parent = ds;
 765         p->port = port;
 766
 767         switch (ds->dst->tag_protocol) {
 768 #ifdef CONFIG_NET_DSA_TAG_DSA
 769         case DSA_TAG_PROTO_DSA:
 770                 p->xmit = dsa_netdev_ops.xmit;
 771                 break;
 772 #endif
 773 #ifdef CONFIG_NET_DSA_TAG_EDSA
 774         case DSA_TAG_PROTO_EDSA:
 775                 p->xmit = edsa_netdev_ops.xmit;
 776                 break;
 777 #endif
 778 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 779         case DSA_TAG_PROTO_TRAILER:
 780                 p->xmit = trailer_netdev_ops.xmit;
 781                 break;
 782 #endif
 783 #ifdef CONFIG_NET_DSA_TAG_BRCM
 784         case DSA_TAG_PROTO_BRCM:
 785                 p->xmit = brcm_netdev_ops.xmit;
 786                 break;
 787 #endif
 788         default:
 789                 p->xmit = dsa_slave_notag_xmit;
 790                 break;
 791         }
 792
 793         p->old_pause = -1;
 794         p->old_link = -1;
 795         p->old_duplex = -1;
 796
 797         ret = dsa_slave_phy_setup(p, slave_dev);
 798         if (ret) {
 799                 free_netdev(slave_dev);
 800                 return ret;
 801         }
 802
 803         ds->ports[port] = slave_dev;
 804         ret = register_netdev(slave_dev);
 805         if (ret) {
 806                 netdev_err(master, "error %d registering interface %s\n",
 807                            ret, slave_dev->name);
 808                 phy_disconnect(p->phy);
 809                 ds->ports[port] = NULL;
 810                 free_netdev(slave_dev);
 811                 return ret;
 812         }
 813
 814         netif_carrier_off(slave_dev);
 815
 816         return 0;
 817 }
 818
 819 static bool dsa_slave_dev_check(struct net_device *dev)
 820 {
 821         return dev->netdev_ops == &dsa_slave_netdev_ops;
 822 }
 823
 824 static int dsa_slave_master_changed(struct net_device *dev)
 825 {
 826         struct net_device *master = netdev_master_upper_dev_get(dev);
 827         int err = 0;
 828
 829         if (master && master->rtnl_link_ops &&
 830             !strcmp(master->rtnl_link_ops->kind, "bridge"))
 831                 err = dsa_slave_bridge_port_join(dev, master);
 832         else
 833                 err = dsa_slave_bridge_port_leave(dev);
 834
 835         return err;
 836 }
 837
 838 int dsa_slave_netdevice_event(struct notifier_block *unused,
 839                               unsigned long event, void *ptr)
 840 {
 841         struct net_device *dev;
 842         int err = 0;
 843
 844         switch (event) {
 845         case NETDEV_CHANGEUPPER:
 846                 dev = netdev_notifier_info_to_dev(ptr);
 847                 if (!dsa_slave_dev_check(dev))
 848                         goto out;
 849
 850                 err = dsa_slave_master_changed(dev);
 851                 if (err)
 852                         netdev_warn(dev, "failed to reflect master change\n");
 853
 854                 break;
 855         }
 856
 857 out:
 858         return NOTIFY_DONE;
 859 }