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 <net/switchdev.h>
  20 #include <linux/if_bridge.h>
  21 #include "dsa_priv.h"
  22
  23 /* slave mii_bus handling ***************************************************/
  24 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  25 {
  26         struct dsa_switch *ds = bus->priv;
  27
  28         if (ds->phys_mii_mask & (1 << addr))
  29                 return ds->drv->phy_read(ds, addr, reg);
  30
  31         return 0xffff;
  32 }
  33
  34 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  35 {
  36         struct dsa_switch *ds = bus->priv;
  37
  38         if (ds->phys_mii_mask & (1 << addr))
  39                 return ds->drv->phy_write(ds, addr, reg, val);
  40
  41         return 0;
  42 }
  43
  44 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  45 {
  46         ds->slave_mii_bus->priv = (void *)ds;
  47         ds->slave_mii_bus->name = "dsa slave smi";
  48         ds->slave_mii_bus->read = dsa_slave_phy_read;
  49         ds->slave_mii_bus->write = dsa_slave_phy_write;
  50         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
  51                         ds->index, ds->pd->sw_addr);
  52         ds->slave_mii_bus->parent = ds->master_dev;
  53         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  54 }
  55
  56
  57 /* slave device handling ****************************************************/
  58 static int dsa_slave_init(struct net_device *dev)
  59 {
  60         struct dsa_slave_priv *p = netdev_priv(dev);
  61
  62         dev->iflink = p->parent->dst->master_netdev->ifindex;
  63
  64         return 0;
  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 int dsa_slave_open(struct net_device *dev)
  73 {
  74         struct dsa_slave_priv *p = netdev_priv(dev);
  75         struct net_device *master = p->parent->dst->master_netdev;
  76         struct dsa_switch *ds = p->parent;
  77         u8 stp_state = dsa_port_is_bridged(p) ?
  78                         BR_STATE_BLOCKING : BR_STATE_FORWARDING;
  79         int err;
  80
  81         if (!(master->flags & IFF_UP))
  82                 return -ENETDOWN;
  83
  84         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  85                 err = dev_uc_add(master, dev->dev_addr);
  86                 if (err < 0)
  87                         goto out;
  88         }
  89
  90         if (dev->flags & IFF_ALLMULTI) {
  91                 err = dev_set_allmulti(master, 1);
  92                 if (err < 0)
  93                         goto del_unicast;
  94         }
  95         if (dev->flags & IFF_PROMISC) {
  96                 err = dev_set_promiscuity(master, 1);
  97                 if (err < 0)
  98                         goto clear_allmulti;
  99         }
 100
 101         if (ds->drv->port_enable) {
 102                 err = ds->drv->port_enable(ds, p->port, p->phy);
 103                 if (err)
 104                         goto clear_promisc;
 105         }
 106
 107         if (ds->drv->port_stp_update)
 108                 ds->drv->port_stp_update(ds, p->port, stp_state);
 109
 110         if (p->phy)
 111                 phy_start(p->phy);
 112
 113         return 0;
 114
 115 clear_promisc:
 116         if (dev->flags & IFF_PROMISC)
 117                 dev_set_promiscuity(master, 0);
 118 clear_allmulti:
 119         if (dev->flags & IFF_ALLMULTI)
 120                 dev_set_allmulti(master, -1);
 121 del_unicast:
 122         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 123                 dev_uc_del(master, dev->dev_addr);
 124 out:
 125         return err;
 126 }
 127
 128 static int dsa_slave_close(struct net_device *dev)
 129 {
 130         struct dsa_slave_priv *p = netdev_priv(dev);
 131         struct net_device *master = p->parent->dst->master_netdev;
 132         struct dsa_switch *ds = p->parent;
 133
 134         if (p->phy)
 135                 phy_stop(p->phy);
 136
 137         dev_mc_unsync(master, dev);
 138         dev_uc_unsync(master, dev);
 139         if (dev->flags & IFF_ALLMULTI)
 140                 dev_set_allmulti(master, -1);
 141         if (dev->flags & IFF_PROMISC)
 142                 dev_set_promiscuity(master, -1);
 143
 144         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 145                 dev_uc_del(master, dev->dev_addr);
 146
 147         if (ds->drv->port_disable)
 148                 ds->drv->port_disable(ds, p->port, p->phy);
 149
 150         if (ds->drv->port_stp_update)
 151                 ds->drv->port_stp_update(ds, p->port, BR_STATE_DISABLED);
 152
 153         return 0;
 154 }
 155
 156 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 157 {
 158         struct dsa_slave_priv *p = netdev_priv(dev);
 159         struct net_device *master = p->parent->dst->master_netdev;
 160
 161         if (change & IFF_ALLMULTI)
 162                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 163         if (change & IFF_PROMISC)
 164                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 165 }
 166
 167 static void dsa_slave_set_rx_mode(struct net_device *dev)
 168 {
 169         struct dsa_slave_priv *p = netdev_priv(dev);
 170         struct net_device *master = p->parent->dst->master_netdev;
 171
 172         dev_mc_sync(master, dev);
 173         dev_uc_sync(master, dev);
 174 }
 175
 176 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 177 {
 178         struct dsa_slave_priv *p = netdev_priv(dev);
 179         struct net_device *master = p->parent->dst->master_netdev;
 180         struct sockaddr *addr = a;
 181         int err;
 182
 183         if (!is_valid_ether_addr(addr->sa_data))
 184                 return -EADDRNOTAVAIL;
 185
 186         if (!(dev->flags & IFF_UP))
 187                 goto out;
 188
 189         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 190                 err = dev_uc_add(master, addr->sa_data);
 191                 if (err < 0)
 192                         return err;
 193         }
 194
 195         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 196                 dev_uc_del(master, dev->dev_addr);
 197
 198 out:
 199         ether_addr_copy(dev->dev_addr, addr->sa_data);
 200
 201         return 0;
 202 }
 203
 204 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 205 {
 206         struct dsa_slave_priv *p = netdev_priv(dev);
 207
 208         if (p->phy != NULL)
 209                 return phy_mii_ioctl(p->phy, ifr, cmd);
 210
 211         return -EOPNOTSUPP;
 212 }
 213
 214 /* Return a bitmask of all ports being currently bridged within a given bridge
 215  * device. Note that on leave, the mask will still return the bitmask of ports
 216  * currently bridged, prior to port removal, and this is exactly what we want.
 217  */
 218 static u32 dsa_slave_br_port_mask(struct dsa_switch *ds,
 219                                   struct net_device *bridge)
 220 {
 221         struct dsa_slave_priv *p;
 222         unsigned int port;
 223         u32 mask = 0;
 224
 225         for (port = 0; port < DSA_MAX_PORTS; port++) {
 226                 if (!dsa_is_port_initialized(ds, port))
 227                         continue;
 228
 229                 p = netdev_priv(ds->ports[port]);
 230
 231                 if (ds->ports[port]->priv_flags & IFF_BRIDGE_PORT &&
 232                     p->bridge_dev == bridge)
 233                         mask |= 1 << port;
 234         }
 235
 236         return mask;
 237 }
 238
 239 static int dsa_slave_stp_update(struct net_device *dev, u8 state)
 240 {
 241         struct dsa_slave_priv *p = netdev_priv(dev);
 242         struct dsa_switch *ds = p->parent;
 243         int ret = -EOPNOTSUPP;
 244
 245         if (ds->drv->port_stp_update)
 246                 ret = ds->drv->port_stp_update(ds, p->port, state);
 247
 248         return ret;
 249 }
 250
 251 static int dsa_slave_bridge_port_join(struct net_device *dev,
 252                                       struct net_device *br)
 253 {
 254         struct dsa_slave_priv *p = netdev_priv(dev);
 255         struct dsa_switch *ds = p->parent;
 256         int ret = -EOPNOTSUPP;
 257
 258         p->bridge_dev = br;
 259
 260         if (ds->drv->port_join_bridge)
 261                 ret = ds->drv->port_join_bridge(ds, p->port,
 262                                                 dsa_slave_br_port_mask(ds, br));
 263
 264         return ret;
 265 }
 266
 267 static int dsa_slave_bridge_port_leave(struct net_device *dev)
 268 {
 269         struct dsa_slave_priv *p = netdev_priv(dev);
 270         struct dsa_switch *ds = p->parent;
 271         int ret = -EOPNOTSUPP;
 272
 273
 274         if (ds->drv->port_leave_bridge)
 275                 ret = ds->drv->port_leave_bridge(ds, p->port,
 276                                                  dsa_slave_br_port_mask(ds, p->bridge_dev));
 277
 278         p->bridge_dev = NULL;
 279
 280         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 281          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 282          */
 283         dsa_slave_stp_update(dev, BR_STATE_FORWARDING);
 284
 285         return ret;
 286 }
 287
 288 static int dsa_slave_parent_id_get(struct net_device *dev,
 289                                    struct netdev_phys_item_id *psid)
 290 {
 291         struct dsa_slave_priv *p = netdev_priv(dev);
 292         struct dsa_switch *ds = p->parent;
 293
 294         psid->id_len = sizeof(ds->index);
 295         memcpy(&psid->id, &ds->index, psid->id_len);
 296
 297         return 0;
 298 }
 299
 300 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 301 {
 302         struct dsa_slave_priv *p = netdev_priv(dev);
 303
 304         return p->xmit(skb, dev);
 305 }
 306
 307 static netdev_tx_t dsa_slave_notag_xmit(struct sk_buff *skb,
 308                                         struct net_device *dev)
 309 {
 310         struct dsa_slave_priv *p = netdev_priv(dev);
 311
 312         skb->dev = p->parent->dst->master_netdev;
 313         dev_queue_xmit(skb);
 314
 315         return NETDEV_TX_OK;
 316 }
 317
 318
 319 /* ethtool operations *******************************************************/
 320 static int
 321 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 322 {
 323         struct dsa_slave_priv *p = netdev_priv(dev);
 324         int err;
 325
 326         err = -EOPNOTSUPP;
 327         if (p->phy != NULL) {
 328                 err = phy_read_status(p->phy);
 329                 if (err == 0)
 330                         err = phy_ethtool_gset(p->phy, cmd);
 331         }
 332
 333         return err;
 334 }
 335
 336 static int
 337 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 338 {
 339         struct dsa_slave_priv *p = netdev_priv(dev);
 340
 341         if (p->phy != NULL)
 342                 return phy_ethtool_sset(p->phy, cmd);
 343
 344         return -EOPNOTSUPP;
 345 }
 346
 347 static void dsa_slave_get_drvinfo(struct net_device *dev,
 348                                   struct ethtool_drvinfo *drvinfo)
 349 {
 350         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 351         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 352         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 353         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 354 }
 355
 356 static int dsa_slave_get_regs_len(struct net_device *dev)
 357 {
 358         struct dsa_slave_priv *p = netdev_priv(dev);
 359         struct dsa_switch *ds = p->parent;
 360
 361         if (ds->drv->get_regs_len)
 362                 return ds->drv->get_regs_len(ds, p->port);
 363
 364         return -EOPNOTSUPP;
 365 }
 366
 367 static void
 368 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 369 {
 370         struct dsa_slave_priv *p = netdev_priv(dev);
 371         struct dsa_switch *ds = p->parent;
 372
 373         if (ds->drv->get_regs)
 374                 ds->drv->get_regs(ds, p->port, regs, _p);
 375 }
 376
 377 static int dsa_slave_nway_reset(struct net_device *dev)
 378 {
 379         struct dsa_slave_priv *p = netdev_priv(dev);
 380
 381         if (p->phy != NULL)
 382                 return genphy_restart_aneg(p->phy);
 383
 384         return -EOPNOTSUPP;
 385 }
 386
 387 static u32 dsa_slave_get_link(struct net_device *dev)
 388 {
 389         struct dsa_slave_priv *p = netdev_priv(dev);
 390
 391         if (p->phy != NULL) {
 392                 genphy_update_link(p->phy);
 393                 return p->phy->link;
 394         }
 395
 396         return -EOPNOTSUPP;
 397 }
 398
 399 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 400 {
 401         struct dsa_slave_priv *p = netdev_priv(dev);
 402         struct dsa_switch *ds = p->parent;
 403
 404         if (ds->pd->eeprom_len)
 405                 return ds->pd->eeprom_len;
 406
 407         if (ds->drv->get_eeprom_len)
 408                 return ds->drv->get_eeprom_len(ds);
 409
 410         return 0;
 411 }
 412
 413 static int dsa_slave_get_eeprom(struct net_device *dev,
 414                                 struct ethtool_eeprom *eeprom, u8 *data)
 415 {
 416         struct dsa_slave_priv *p = netdev_priv(dev);
 417         struct dsa_switch *ds = p->parent;
 418
 419         if (ds->drv->get_eeprom)
 420                 return ds->drv->get_eeprom(ds, eeprom, data);
 421
 422         return -EOPNOTSUPP;
 423 }
 424
 425 static int dsa_slave_set_eeprom(struct net_device *dev,
 426                                 struct ethtool_eeprom *eeprom, u8 *data)
 427 {
 428         struct dsa_slave_priv *p = netdev_priv(dev);
 429         struct dsa_switch *ds = p->parent;
 430
 431         if (ds->drv->set_eeprom)
 432                 return ds->drv->set_eeprom(ds, eeprom, data);
 433
 434         return -EOPNOTSUPP;
 435 }
 436
 437 static void dsa_slave_get_strings(struct net_device *dev,
 438                                   uint32_t stringset, uint8_t *data)
 439 {
 440         struct dsa_slave_priv *p = netdev_priv(dev);
 441         struct dsa_switch *ds = p->parent;
 442
 443         if (stringset == ETH_SS_STATS) {
 444                 int len = ETH_GSTRING_LEN;
 445
 446                 strncpy(data, "tx_packets", len);
 447                 strncpy(data + len, "tx_bytes", len);
 448                 strncpy(data + 2 * len, "rx_packets", len);
 449                 strncpy(data + 3 * len, "rx_bytes", len);
 450                 if (ds->drv->get_strings != NULL)
 451                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 452         }
 453 }
 454
 455 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 456                                         struct ethtool_stats *stats,
 457                                         uint64_t *data)
 458 {
 459         struct dsa_slave_priv *p = netdev_priv(dev);
 460         struct dsa_switch *ds = p->parent;
 461
 462         data[0] = p->dev->stats.tx_packets;
 463         data[1] = p->dev->stats.tx_bytes;
 464         data[2] = p->dev->stats.rx_packets;
 465         data[3] = p->dev->stats.rx_bytes;
 466         if (ds->drv->get_ethtool_stats != NULL)
 467                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 468 }
 469
 470 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 471 {
 472         struct dsa_slave_priv *p = netdev_priv(dev);
 473         struct dsa_switch *ds = p->parent;
 474
 475         if (sset == ETH_SS_STATS) {
 476                 int count;
 477
 478                 count = 4;
 479                 if (ds->drv->get_sset_count != NULL)
 480                         count += ds->drv->get_sset_count(ds);
 481
 482                 return count;
 483         }
 484
 485         return -EOPNOTSUPP;
 486 }
 487
 488 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 489 {
 490         struct dsa_slave_priv *p = netdev_priv(dev);
 491         struct dsa_switch *ds = p->parent;
 492
 493         if (ds->drv->get_wol)
 494                 ds->drv->get_wol(ds, p->port, w);
 495 }
 496
 497 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 498 {
 499         struct dsa_slave_priv *p = netdev_priv(dev);
 500         struct dsa_switch *ds = p->parent;
 501         int ret = -EOPNOTSUPP;
 502
 503         if (ds->drv->set_wol)
 504                 ret = ds->drv->set_wol(ds, p->port, w);
 505
 506         return ret;
 507 }
 508
 509 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 510 {
 511         struct dsa_slave_priv *p = netdev_priv(dev);
 512         struct dsa_switch *ds = p->parent;
 513         int ret;
 514
 515         if (!ds->drv->set_eee)
 516                 return -EOPNOTSUPP;
 517
 518         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 519         if (ret)
 520                 return ret;
 521
 522         if (p->phy)
 523                 ret = phy_ethtool_set_eee(p->phy, e);
 524
 525         return ret;
 526 }
 527
 528 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 529 {
 530         struct dsa_slave_priv *p = netdev_priv(dev);
 531         struct dsa_switch *ds = p->parent;
 532         int ret;
 533
 534         if (!ds->drv->get_eee)
 535                 return -EOPNOTSUPP;
 536
 537         ret = ds->drv->get_eee(ds, p->port, e);
 538         if (ret)
 539                 return ret;
 540
 541         if (p->phy)
 542                 ret = phy_ethtool_get_eee(p->phy, e);
 543
 544         return ret;
 545 }
 546
 547 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 548         .get_settings           = dsa_slave_get_settings,
 549         .set_settings           = dsa_slave_set_settings,
 550         .get_drvinfo            = dsa_slave_get_drvinfo,
 551         .get_regs_len           = dsa_slave_get_regs_len,
 552         .get_regs               = dsa_slave_get_regs,
 553         .nway_reset             = dsa_slave_nway_reset,
 554         .get_link               = dsa_slave_get_link,
 555         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 556         .get_eeprom             = dsa_slave_get_eeprom,
 557         .set_eeprom             = dsa_slave_set_eeprom,
 558         .get_strings            = dsa_slave_get_strings,
 559         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 560         .get_sset_count         = dsa_slave_get_sset_count,
 561         .set_wol                = dsa_slave_set_wol,
 562         .get_wol                = dsa_slave_get_wol,
 563         .set_eee                = dsa_slave_set_eee,
 564         .get_eee                = dsa_slave_get_eee,
 565 };
 566
 567 static const struct net_device_ops dsa_slave_netdev_ops = {
 568         .ndo_init               = dsa_slave_init,
 569         .ndo_open               = dsa_slave_open,
 570         .ndo_stop               = dsa_slave_close,
 571         .ndo_start_xmit         = dsa_slave_xmit,
 572         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 573         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 574         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 575         .ndo_do_ioctl           = dsa_slave_ioctl,
 576 };
 577
 578 static const struct swdev_ops dsa_slave_swdev_ops = {
 579         .swdev_parent_id_get = dsa_slave_parent_id_get,
 580         .swdev_port_stp_update = dsa_slave_stp_update,
 581 };
 582
 583 static void dsa_slave_adjust_link(struct net_device *dev)
 584 {
 585         struct dsa_slave_priv *p = netdev_priv(dev);
 586         struct dsa_switch *ds = p->parent;
 587         unsigned int status_changed = 0;
 588
 589         if (p->old_link != p->phy->link) {
 590                 status_changed = 1;
 591                 p->old_link = p->phy->link;
 592         }
 593
 594         if (p->old_duplex != p->phy->duplex) {
 595                 status_changed = 1;
 596                 p->old_duplex = p->phy->duplex;
 597         }
 598
 599         if (p->old_pause != p->phy->pause) {
 600                 status_changed = 1;
 601                 p->old_pause = p->phy->pause;
 602         }
 603
 604         if (ds->drv->adjust_link && status_changed)
 605                 ds->drv->adjust_link(ds, p->port, p->phy);
 606
 607         if (status_changed)
 608                 phy_print_status(p->phy);
 609 }
 610
 611 static int dsa_slave_fixed_link_update(struct net_device *dev,
 612                                        struct fixed_phy_status *status)
 613 {
 614         struct dsa_slave_priv *p = netdev_priv(dev);
 615         struct dsa_switch *ds = p->parent;
 616
 617         if (ds->drv->fixed_link_update)
 618                 ds->drv->fixed_link_update(ds, p->port, status);
 619
 620         return 0;
 621 }
 622
 623 /* slave device setup *******************************************************/
 624 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
 625                                  struct net_device *slave_dev,
 626                                  int addr)
 627 {
 628         struct dsa_switch *ds = p->parent;
 629
 630         p->phy = ds->slave_mii_bus->phy_map[addr];
 631         if (!p->phy)
 632                 return -ENODEV;
 633
 634         /* Use already configured phy mode */
 635         p->phy_interface = p->phy->interface;
 636         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
 637                            p->phy_interface);
 638
 639         return 0;
 640 }
 641
 642 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
 643                                 struct net_device *slave_dev)
 644 {
 645         struct dsa_switch *ds = p->parent;
 646         struct dsa_chip_data *cd = ds->pd;
 647         struct device_node *phy_dn, *port_dn;
 648         bool phy_is_fixed = false;
 649         u32 phy_flags = 0;
 650         int mode, ret;
 651
 652         port_dn = cd->port_dn[p->port];
 653         mode = of_get_phy_mode(port_dn);
 654         if (mode < 0)
 655                 mode = PHY_INTERFACE_MODE_NA;
 656         p->phy_interface = mode;
 657
 658         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
 659         if (of_phy_is_fixed_link(port_dn)) {
 660                 /* In the case of a fixed PHY, the DT node associated
 661                  * to the fixed PHY is the Port DT node
 662                  */
 663                 ret = of_phy_register_fixed_link(port_dn);
 664                 if (ret) {
 665                         netdev_err(slave_dev, "failed to register fixed PHY\n");
 666                         return ret;
 667                 }
 668                 phy_is_fixed = true;
 669                 phy_dn = port_dn;
 670         }
 671
 672         if (ds->drv->get_phy_flags)
 673                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
 674
 675         if (phy_dn) {
 676                 ret = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
 677                 /* If this PHY address is part of phys_mii_mask, which means
 678                  * that we need to divert reads and writes to/from it, then we
 679                  * want to bind this device using the slave MII bus created by
 680                  * DSA to make that happen.
 681                  */
 682                 if (!phy_is_fixed && ret >= 0 &&
 683                     (ds->phys_mii_mask & (1 << ret))) {
 684                         ret = dsa_slave_phy_connect(p, slave_dev, ret);
 685                         if (ret)
 686                                 return ret;
 687                 } else {
 688                         p->phy = of_phy_connect(slave_dev, phy_dn,
 689                                                 dsa_slave_adjust_link,
 690                                                 phy_flags,
 691                                                 p->phy_interface);
 692                 }
 693         }
 694
 695         if (p->phy && phy_is_fixed)
 696                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
 697
 698         /* We could not connect to a designated PHY, so use the switch internal
 699          * MDIO bus instead
 700          */
 701         if (!p->phy) {
 702                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
 703                 if (ret)
 704                         return ret;
 705         } else {
 706                 netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
 707                             p->phy->addr, p->phy->drv->name);
 708         }
 709
 710         return 0;
 711 }
 712
 713 int dsa_slave_suspend(struct net_device *slave_dev)
 714 {
 715         struct dsa_slave_priv *p = netdev_priv(slave_dev);
 716
 717         netif_device_detach(slave_dev);
 718
 719         if (p->phy) {
 720                 phy_stop(p->phy);
 721                 p->old_pause = -1;
 722                 p->old_link = -1;
 723                 p->old_duplex = -1;
 724                 phy_suspend(p->phy);
 725         }
 726
 727         return 0;
 728 }
 729
 730 int dsa_slave_resume(struct net_device *slave_dev)
 731 {
 732         struct dsa_slave_priv *p = netdev_priv(slave_dev);
 733
 734         netif_device_attach(slave_dev);
 735
 736         if (p->phy) {
 737                 phy_resume(p->phy);
 738                 phy_start(p->phy);
 739         }
 740
 741         return 0;
 742 }
 743
 744 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 745                      int port, char *name)
 746 {
 747         struct net_device *master = ds->dst->master_netdev;
 748         struct net_device *slave_dev;
 749         struct dsa_slave_priv *p;
 750         int ret;
 751
 752         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
 753                                  NET_NAME_UNKNOWN, ether_setup);
 754         if (slave_dev == NULL)
 755                 return -ENOMEM;
 756
 757         slave_dev->features = master->vlan_features;
 758         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
 759         eth_hw_addr_inherit(slave_dev, master);
 760         slave_dev->tx_queue_len = 0;
 761         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
 762         slave_dev->swdev_ops = &dsa_slave_swdev_ops;
 763
 764         SET_NETDEV_DEV(slave_dev, parent);
 765         slave_dev->dev.of_node = ds->pd->port_dn[port];
 766         slave_dev->vlan_features = master->vlan_features;
 767
 768         p = netdev_priv(slave_dev);
 769         p->dev = slave_dev;
 770         p->parent = ds;
 771         p->port = port;
 772
 773         switch (ds->dst->tag_protocol) {
 774 #ifdef CONFIG_NET_DSA_TAG_DSA
 775         case DSA_TAG_PROTO_DSA:
 776                 p->xmit = dsa_netdev_ops.xmit;
 777                 break;
 778 #endif
 779 #ifdef CONFIG_NET_DSA_TAG_EDSA
 780         case DSA_TAG_PROTO_EDSA:
 781                 p->xmit = edsa_netdev_ops.xmit;
 782                 break;
 783 #endif
 784 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 785         case DSA_TAG_PROTO_TRAILER:
 786                 p->xmit = trailer_netdev_ops.xmit;
 787                 break;
 788 #endif
 789 #ifdef CONFIG_NET_DSA_TAG_BRCM
 790         case DSA_TAG_PROTO_BRCM:
 791                 p->xmit = brcm_netdev_ops.xmit;
 792                 break;
 793 #endif
 794         default:
 795                 p->xmit = dsa_slave_notag_xmit;
 796                 break;
 797         }
 798
 799         p->old_pause = -1;
 800         p->old_link = -1;
 801         p->old_duplex = -1;
 802
 803         ret = dsa_slave_phy_setup(p, slave_dev);
 804         if (ret) {
 805                 free_netdev(slave_dev);
 806                 return ret;
 807         }
 808
 809         ds->ports[port] = slave_dev;
 810         ret = register_netdev(slave_dev);
 811         if (ret) {
 812                 netdev_err(master, "error %d registering interface %s\n",
 813                            ret, slave_dev->name);
 814                 phy_disconnect(p->phy);
 815                 ds->ports[port] = NULL;
 816                 free_netdev(slave_dev);
 817                 return ret;
 818         }
 819
 820         netif_carrier_off(slave_dev);
 821
 822         return 0;
 823 }
 824
 825 static bool dsa_slave_dev_check(struct net_device *dev)
 826 {
 827         return dev->netdev_ops == &dsa_slave_netdev_ops;
 828 }
 829
 830 static int dsa_slave_master_changed(struct net_device *dev)
 831 {
 832         struct net_device *master = netdev_master_upper_dev_get(dev);
 833         int err = 0;
 834
 835         if (master && master->rtnl_link_ops &&
 836             !strcmp(master->rtnl_link_ops->kind, "bridge"))
 837                 err = dsa_slave_bridge_port_join(dev, master);
 838         else
 839                 err = dsa_slave_bridge_port_leave(dev);
 840
 841         return err;
 842 }
 843
 844 int dsa_slave_netdevice_event(struct notifier_block *unused,
 845                               unsigned long event, void *ptr)
 846 {
 847         struct net_device *dev;
 848         int err = 0;
 849
 850         switch (event) {
 851         case NETDEV_CHANGEUPPER:
 852                 dev = netdev_notifier_info_to_dev(ptr);
 853                 if (!dsa_slave_dev_check(dev))
 854                         goto out;
 855
 856                 err = dsa_slave_master_changed(dev);
 857                 if (err)
 858                         netdev_warn(dev, "failed to reflect master change\n");
 859
 860                 break;
 861         }
 862
 863 out:
 864         return NOTIFY_DONE;
 865 }