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/phy.h>
  14 #include <linux/phy_fixed.h>
  15 #include <linux/of_net.h>
  16 #include <linux/of_mdio.h>
  17 #include "dsa_priv.h"
  18
  19 /* slave mii_bus handling ***************************************************/
  20 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  21 {
  22         struct dsa_switch *ds = bus->priv;
  23
  24         if (ds->phys_mii_mask & (1 << addr))
  25                 return ds->drv->phy_read(ds, addr, reg);
  26
  27         return 0xffff;
  28 }
  29
  30 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  31 {
  32         struct dsa_switch *ds = bus->priv;
  33
  34         if (ds->phys_mii_mask & (1 << addr))
  35                 return ds->drv->phy_write(ds, addr, reg, val);
  36
  37         return 0;
  38 }
  39
  40 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  41 {
  42         ds->slave_mii_bus->priv = (void *)ds;
  43         ds->slave_mii_bus->name = "dsa slave smi";
  44         ds->slave_mii_bus->read = dsa_slave_phy_read;
  45         ds->slave_mii_bus->write = dsa_slave_phy_write;
  46         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
  47                         ds->index, ds->pd->sw_addr);
  48         ds->slave_mii_bus->parent = ds->master_dev;
  49         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  50 }
  51
  52
  53 /* slave device handling ****************************************************/
  54 static int dsa_slave_init(struct net_device *dev)
  55 {
  56         struct dsa_slave_priv *p = netdev_priv(dev);
  57
  58         dev->iflink = p->parent->dst->master_netdev->ifindex;
  59
  60         return 0;
  61 }
  62
  63 static int dsa_slave_open(struct net_device *dev)
  64 {
  65         struct dsa_slave_priv *p = netdev_priv(dev);
  66         struct net_device *master = p->parent->dst->master_netdev;
  67         struct dsa_switch *ds = p->parent;
  68         int err;
  69
  70         if (!(master->flags & IFF_UP))
  71                 return -ENETDOWN;
  72
  73         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  74                 err = dev_uc_add(master, dev->dev_addr);
  75                 if (err < 0)
  76                         goto out;
  77         }
  78
  79         if (dev->flags & IFF_ALLMULTI) {
  80                 err = dev_set_allmulti(master, 1);
  81                 if (err < 0)
  82                         goto del_unicast;
  83         }
  84         if (dev->flags & IFF_PROMISC) {
  85                 err = dev_set_promiscuity(master, 1);
  86                 if (err < 0)
  87                         goto clear_allmulti;
  88         }
  89
  90         if (ds->drv->port_enable) {
  91                 err = ds->drv->port_enable(ds, p->port, p->phy);
  92                 if (err)
  93                         goto clear_promisc;
  94         }
  95
  96         if (p->phy)
  97                 phy_start(p->phy);
  98
  99         return 0;
 100
 101 clear_promisc:
 102         if (dev->flags & IFF_PROMISC)
 103                 dev_set_promiscuity(master, 0);
 104 clear_allmulti:
 105         if (dev->flags & IFF_ALLMULTI)
 106                 dev_set_allmulti(master, -1);
 107 del_unicast:
 108         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 109                 dev_uc_del(master, dev->dev_addr);
 110 out:
 111         return err;
 112 }
 113
 114 static int dsa_slave_close(struct net_device *dev)
 115 {
 116         struct dsa_slave_priv *p = netdev_priv(dev);
 117         struct net_device *master = p->parent->dst->master_netdev;
 118         struct dsa_switch *ds = p->parent;
 119
 120         if (p->phy)
 121                 phy_stop(p->phy);
 122
 123         dev_mc_unsync(master, dev);
 124         dev_uc_unsync(master, dev);
 125         if (dev->flags & IFF_ALLMULTI)
 126                 dev_set_allmulti(master, -1);
 127         if (dev->flags & IFF_PROMISC)
 128                 dev_set_promiscuity(master, -1);
 129
 130         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 131                 dev_uc_del(master, dev->dev_addr);
 132
 133         if (ds->drv->port_disable)
 134                 ds->drv->port_disable(ds, p->port, p->phy);
 135
 136         return 0;
 137 }
 138
 139 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 140 {
 141         struct dsa_slave_priv *p = netdev_priv(dev);
 142         struct net_device *master = p->parent->dst->master_netdev;
 143
 144         if (change & IFF_ALLMULTI)
 145                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 146         if (change & IFF_PROMISC)
 147                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 148 }
 149
 150 static void dsa_slave_set_rx_mode(struct net_device *dev)
 151 {
 152         struct dsa_slave_priv *p = netdev_priv(dev);
 153         struct net_device *master = p->parent->dst->master_netdev;
 154
 155         dev_mc_sync(master, dev);
 156         dev_uc_sync(master, dev);
 157 }
 158
 159 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 160 {
 161         struct dsa_slave_priv *p = netdev_priv(dev);
 162         struct net_device *master = p->parent->dst->master_netdev;
 163         struct sockaddr *addr = a;
 164         int err;
 165
 166         if (!is_valid_ether_addr(addr->sa_data))
 167                 return -EADDRNOTAVAIL;
 168
 169         if (!(dev->flags & IFF_UP))
 170                 goto out;
 171
 172         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 173                 err = dev_uc_add(master, addr->sa_data);
 174                 if (err < 0)
 175                         return err;
 176         }
 177
 178         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 179                 dev_uc_del(master, dev->dev_addr);
 180
 181 out:
 182         ether_addr_copy(dev->dev_addr, addr->sa_data);
 183
 184         return 0;
 185 }
 186
 187 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 188 {
 189         struct dsa_slave_priv *p = netdev_priv(dev);
 190
 191         if (p->phy != NULL)
 192                 return phy_mii_ioctl(p->phy, ifr, cmd);
 193
 194         return -EOPNOTSUPP;
 195 }
 196
 197 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 198 {
 199         struct dsa_slave_priv *p = netdev_priv(dev);
 200
 201         return p->xmit(skb, dev);
 202 }
 203
 204 static netdev_tx_t dsa_slave_notag_xmit(struct sk_buff *skb,
 205                                         struct net_device *dev)
 206 {
 207         struct dsa_slave_priv *p = netdev_priv(dev);
 208
 209         skb->dev = p->parent->dst->master_netdev;
 210         dev_queue_xmit(skb);
 211
 212         return NETDEV_TX_OK;
 213 }
 214
 215
 216 /* ethtool operations *******************************************************/
 217 static int
 218 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 219 {
 220         struct dsa_slave_priv *p = netdev_priv(dev);
 221         int err;
 222
 223         err = -EOPNOTSUPP;
 224         if (p->phy != NULL) {
 225                 err = phy_read_status(p->phy);
 226                 if (err == 0)
 227                         err = phy_ethtool_gset(p->phy, cmd);
 228         }
 229
 230         return err;
 231 }
 232
 233 static int
 234 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 235 {
 236         struct dsa_slave_priv *p = netdev_priv(dev);
 237
 238         if (p->phy != NULL)
 239                 return phy_ethtool_sset(p->phy, cmd);
 240
 241         return -EOPNOTSUPP;
 242 }
 243
 244 static void dsa_slave_get_drvinfo(struct net_device *dev,
 245                                   struct ethtool_drvinfo *drvinfo)
 246 {
 247         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 248         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 249         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 250         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 251 }
 252
 253 static int dsa_slave_get_regs_len(struct net_device *dev)
 254 {
 255         struct dsa_slave_priv *p = netdev_priv(dev);
 256         struct dsa_switch *ds = p->parent;
 257
 258         if (ds->drv->get_regs_len)
 259                 return ds->drv->get_regs_len(ds, p->port);
 260
 261         return -EOPNOTSUPP;
 262 }
 263
 264 static void
 265 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 266 {
 267         struct dsa_slave_priv *p = netdev_priv(dev);
 268         struct dsa_switch *ds = p->parent;
 269
 270         if (ds->drv->get_regs)
 271                 ds->drv->get_regs(ds, p->port, regs, _p);
 272 }
 273
 274 static int dsa_slave_nway_reset(struct net_device *dev)
 275 {
 276         struct dsa_slave_priv *p = netdev_priv(dev);
 277
 278         if (p->phy != NULL)
 279                 return genphy_restart_aneg(p->phy);
 280
 281         return -EOPNOTSUPP;
 282 }
 283
 284 static u32 dsa_slave_get_link(struct net_device *dev)
 285 {
 286         struct dsa_slave_priv *p = netdev_priv(dev);
 287
 288         if (p->phy != NULL) {
 289                 genphy_update_link(p->phy);
 290                 return p->phy->link;
 291         }
 292
 293         return -EOPNOTSUPP;
 294 }
 295
 296 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 297 {
 298         struct dsa_slave_priv *p = netdev_priv(dev);
 299         struct dsa_switch *ds = p->parent;
 300
 301         if (ds->pd->eeprom_len)
 302                 return ds->pd->eeprom_len;
 303
 304         if (ds->drv->get_eeprom_len)
 305                 return ds->drv->get_eeprom_len(ds);
 306
 307         return 0;
 308 }
 309
 310 static int dsa_slave_get_eeprom(struct net_device *dev,
 311                                 struct ethtool_eeprom *eeprom, u8 *data)
 312 {
 313         struct dsa_slave_priv *p = netdev_priv(dev);
 314         struct dsa_switch *ds = p->parent;
 315
 316         if (ds->drv->get_eeprom)
 317                 return ds->drv->get_eeprom(ds, eeprom, data);
 318
 319         return -EOPNOTSUPP;
 320 }
 321
 322 static int dsa_slave_set_eeprom(struct net_device *dev,
 323                                 struct ethtool_eeprom *eeprom, u8 *data)
 324 {
 325         struct dsa_slave_priv *p = netdev_priv(dev);
 326         struct dsa_switch *ds = p->parent;
 327
 328         if (ds->drv->set_eeprom)
 329                 return ds->drv->set_eeprom(ds, eeprom, data);
 330
 331         return -EOPNOTSUPP;
 332 }
 333
 334 static void dsa_slave_get_strings(struct net_device *dev,
 335                                   uint32_t stringset, uint8_t *data)
 336 {
 337         struct dsa_slave_priv *p = netdev_priv(dev);
 338         struct dsa_switch *ds = p->parent;
 339
 340         if (stringset == ETH_SS_STATS) {
 341                 int len = ETH_GSTRING_LEN;
 342
 343                 strncpy(data, "tx_packets", len);
 344                 strncpy(data + len, "tx_bytes", len);
 345                 strncpy(data + 2 * len, "rx_packets", len);
 346                 strncpy(data + 3 * len, "rx_bytes", len);
 347                 if (ds->drv->get_strings != NULL)
 348                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 349         }
 350 }
 351
 352 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 353                                         struct ethtool_stats *stats,
 354                                         uint64_t *data)
 355 {
 356         struct dsa_slave_priv *p = netdev_priv(dev);
 357         struct dsa_switch *ds = p->parent;
 358
 359         data[0] = p->dev->stats.tx_packets;
 360         data[1] = p->dev->stats.tx_bytes;
 361         data[2] = p->dev->stats.rx_packets;
 362         data[3] = p->dev->stats.rx_bytes;
 363         if (ds->drv->get_ethtool_stats != NULL)
 364                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 365 }
 366
 367 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 368 {
 369         struct dsa_slave_priv *p = netdev_priv(dev);
 370         struct dsa_switch *ds = p->parent;
 371
 372         if (sset == ETH_SS_STATS) {
 373                 int count;
 374
 375                 count = 4;
 376                 if (ds->drv->get_sset_count != NULL)
 377                         count += ds->drv->get_sset_count(ds);
 378
 379                 return count;
 380         }
 381
 382         return -EOPNOTSUPP;
 383 }
 384
 385 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 386 {
 387         struct dsa_slave_priv *p = netdev_priv(dev);
 388         struct dsa_switch *ds = p->parent;
 389
 390         if (ds->drv->get_wol)
 391                 ds->drv->get_wol(ds, p->port, w);
 392 }
 393
 394 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 395 {
 396         struct dsa_slave_priv *p = netdev_priv(dev);
 397         struct dsa_switch *ds = p->parent;
 398         int ret = -EOPNOTSUPP;
 399
 400         if (ds->drv->set_wol)
 401                 ret = ds->drv->set_wol(ds, p->port, w);
 402
 403         return ret;
 404 }
 405
 406 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 407 {
 408         struct dsa_slave_priv *p = netdev_priv(dev);
 409         struct dsa_switch *ds = p->parent;
 410         int ret;
 411
 412         if (!ds->drv->set_eee)
 413                 return -EOPNOTSUPP;
 414
 415         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 416         if (ret)
 417                 return ret;
 418
 419         if (p->phy)
 420                 ret = phy_ethtool_set_eee(p->phy, e);
 421
 422         return ret;
 423 }
 424
 425 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 426 {
 427         struct dsa_slave_priv *p = netdev_priv(dev);
 428         struct dsa_switch *ds = p->parent;
 429         int ret;
 430
 431         if (!ds->drv->get_eee)
 432                 return -EOPNOTSUPP;
 433
 434         ret = ds->drv->get_eee(ds, p->port, e);
 435         if (ret)
 436                 return ret;
 437
 438         if (p->phy)
 439                 ret = phy_ethtool_get_eee(p->phy, e);
 440
 441         return ret;
 442 }
 443
 444 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 445         .get_settings           = dsa_slave_get_settings,
 446         .set_settings           = dsa_slave_set_settings,
 447         .get_drvinfo            = dsa_slave_get_drvinfo,
 448         .get_regs_len           = dsa_slave_get_regs_len,
 449         .get_regs               = dsa_slave_get_regs,
 450         .nway_reset             = dsa_slave_nway_reset,
 451         .get_link               = dsa_slave_get_link,
 452         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 453         .get_eeprom             = dsa_slave_get_eeprom,
 454         .set_eeprom             = dsa_slave_set_eeprom,
 455         .get_strings            = dsa_slave_get_strings,
 456         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 457         .get_sset_count         = dsa_slave_get_sset_count,
 458         .set_wol                = dsa_slave_set_wol,
 459         .get_wol                = dsa_slave_get_wol,
 460         .set_eee                = dsa_slave_set_eee,
 461         .get_eee                = dsa_slave_get_eee,
 462 };
 463
 464 static const struct net_device_ops dsa_slave_netdev_ops = {
 465         .ndo_init               = dsa_slave_init,
 466         .ndo_open               = dsa_slave_open,
 467         .ndo_stop               = dsa_slave_close,
 468         .ndo_start_xmit         = dsa_slave_xmit,
 469         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 470         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 471         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 472         .ndo_do_ioctl           = dsa_slave_ioctl,
 473 };
 474
 475 static void dsa_slave_adjust_link(struct net_device *dev)
 476 {
 477         struct dsa_slave_priv *p = netdev_priv(dev);
 478         struct dsa_switch *ds = p->parent;
 479         unsigned int status_changed = 0;
 480
 481         if (p->old_link != p->phy->link) {
 482                 status_changed = 1;
 483                 p->old_link = p->phy->link;
 484         }
 485
 486         if (p->old_duplex != p->phy->duplex) {
 487                 status_changed = 1;
 488                 p->old_duplex = p->phy->duplex;
 489         }
 490
 491         if (p->old_pause != p->phy->pause) {
 492                 status_changed = 1;
 493                 p->old_pause = p->phy->pause;
 494         }
 495
 496         if (ds->drv->adjust_link && status_changed)
 497                 ds->drv->adjust_link(ds, p->port, p->phy);
 498
 499         if (status_changed)
 500                 phy_print_status(p->phy);
 501 }
 502
 503 static int dsa_slave_fixed_link_update(struct net_device *dev,
 504                                        struct fixed_phy_status *status)
 505 {
 506         struct dsa_slave_priv *p = netdev_priv(dev);
 507         struct dsa_switch *ds = p->parent;
 508
 509         if (ds->drv->fixed_link_update)
 510                 ds->drv->fixed_link_update(ds, p->port, status);
 511
 512         return 0;
 513 }
 514
 515 /* slave device setup *******************************************************/
 516 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
 517                                 struct net_device *slave_dev)
 518 {
 519         struct dsa_switch *ds = p->parent;
 520         struct dsa_chip_data *cd = ds->pd;
 521         struct device_node *phy_dn, *port_dn;
 522         bool phy_is_fixed = false;
 523         u32 phy_flags = 0;
 524         int mode, ret;
 525
 526         port_dn = cd->port_dn[p->port];
 527         mode = of_get_phy_mode(port_dn);
 528         if (mode < 0)
 529                 mode = PHY_INTERFACE_MODE_NA;
 530         p->phy_interface = mode;
 531
 532         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
 533         if (of_phy_is_fixed_link(port_dn)) {
 534                 /* In the case of a fixed PHY, the DT node associated
 535                  * to the fixed PHY is the Port DT node
 536                  */
 537                 ret = of_phy_register_fixed_link(port_dn);
 538                 if (ret) {
 539                         netdev_err(slave_dev, "failed to register fixed PHY\n");
 540                         return ret;
 541                 }
 542                 phy_is_fixed = true;
 543                 phy_dn = port_dn;
 544         }
 545
 546         if (ds->drv->get_phy_flags)
 547                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
 548
 549         if (phy_dn)
 550                 p->phy = of_phy_connect(slave_dev, phy_dn,
 551                                         dsa_slave_adjust_link, phy_flags,
 552                                         p->phy_interface);
 553
 554         if (p->phy && phy_is_fixed)
 555                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
 556
 557         /* We could not connect to a designated PHY, so use the switch internal
 558          * MDIO bus instead
 559          */
 560         if (!p->phy) {
 561                 p->phy = ds->slave_mii_bus->phy_map[p->port];
 562                 if (!p->phy)
 563                         return -ENODEV;
 564
 565                 /* Use already configured phy mode */
 566                 p->phy_interface = p->phy->interface;
 567                 phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
 568                                    p->phy_interface);
 569         } else {
 570                 netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
 571                             p->phy->addr, p->phy->drv->name);
 572         }
 573
 574         return 0;
 575 }
 576
 577 int dsa_slave_suspend(struct net_device *slave_dev)
 578 {
 579         struct dsa_slave_priv *p = netdev_priv(slave_dev);
 580
 581         netif_device_detach(slave_dev);
 582
 583         if (p->phy) {
 584                 phy_stop(p->phy);
 585                 p->old_pause = -1;
 586                 p->old_link = -1;
 587                 p->old_duplex = -1;
 588                 phy_suspend(p->phy);
 589         }
 590
 591         return 0;
 592 }
 593
 594 int dsa_slave_resume(struct net_device *slave_dev)
 595 {
 596         struct dsa_slave_priv *p = netdev_priv(slave_dev);
 597
 598         netif_device_attach(slave_dev);
 599
 600         if (p->phy) {
 601                 phy_resume(p->phy);
 602                 phy_start(p->phy);
 603         }
 604
 605         return 0;
 606 }
 607
 608 struct net_device *
 609 dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 610                  int port, char *name)
 611 {
 612         struct net_device *master = ds->dst->master_netdev;
 613         struct net_device *slave_dev;
 614         struct dsa_slave_priv *p;
 615         int ret;
 616
 617         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
 618                                  NET_NAME_UNKNOWN, ether_setup);
 619         if (slave_dev == NULL)
 620                 return slave_dev;
 621
 622         slave_dev->features = master->vlan_features;
 623         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
 624         eth_hw_addr_inherit(slave_dev, master);
 625         slave_dev->tx_queue_len = 0;
 626         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
 627
 628         SET_NETDEV_DEV(slave_dev, parent);
 629         slave_dev->dev.of_node = ds->pd->port_dn[port];
 630         slave_dev->vlan_features = master->vlan_features;
 631
 632         p = netdev_priv(slave_dev);
 633         p->dev = slave_dev;
 634         p->parent = ds;
 635         p->port = port;
 636
 637         switch (ds->dst->tag_protocol) {
 638 #ifdef CONFIG_NET_DSA_TAG_DSA
 639         case DSA_TAG_PROTO_DSA:
 640                 p->xmit = dsa_netdev_ops.xmit;
 641                 break;
 642 #endif
 643 #ifdef CONFIG_NET_DSA_TAG_EDSA
 644         case DSA_TAG_PROTO_EDSA:
 645                 p->xmit = edsa_netdev_ops.xmit;
 646                 break;
 647 #endif
 648 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 649         case DSA_TAG_PROTO_TRAILER:
 650                 p->xmit = trailer_netdev_ops.xmit;
 651                 break;
 652 #endif
 653 #ifdef CONFIG_NET_DSA_TAG_BRCM
 654         case DSA_TAG_PROTO_BRCM:
 655                 p->xmit = brcm_netdev_ops.xmit;
 656                 break;
 657 #endif
 658         default:
 659                 p->xmit = dsa_slave_notag_xmit;
 660                 break;
 661         }
 662
 663         p->old_pause = -1;
 664         p->old_link = -1;
 665         p->old_duplex = -1;
 666
 667         ret = dsa_slave_phy_setup(p, slave_dev);
 668         if (ret) {
 669                 free_netdev(slave_dev);
 670                 return NULL;
 671         }
 672
 673         ret = register_netdev(slave_dev);
 674         if (ret) {
 675                 netdev_err(master, "error %d registering interface %s\n",
 676                            ret, slave_dev->name);
 677                 phy_disconnect(p->phy);
 678                 free_netdev(slave_dev);
 679                 return NULL;
 680         }
 681
 682         netif_carrier_off(slave_dev);
 683
 684         return slave_dev;
 685 }