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 <linux/list.h>
  20 #include <net/rtnetlink.h>
  21 #include <net/pkt_cls.h>
  22 #include <net/tc_act/tc_mirred.h>
  23 #include <linux/if_bridge.h>
  24 #include <linux/netpoll.h>
  25
  26 #include "dsa_priv.h"
  27
  28 static bool dsa_slave_dev_check(struct net_device *dev);
  29
  30 /* slave mii_bus handling ***************************************************/
  31 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  32 {
  33         struct dsa_switch *ds = bus->priv;
  34
  35         if (ds->phys_mii_mask & (1 << addr))
  36                 return ds->ops->phy_read(ds, addr, reg);
  37
  38         return 0xffff;
  39 }
  40
  41 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  42 {
  43         struct dsa_switch *ds = bus->priv;
  44
  45         if (ds->phys_mii_mask & (1 << addr))
  46                 return ds->ops->phy_write(ds, addr, reg, val);
  47
  48         return 0;
  49 }
  50
  51 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  52 {
  53         ds->slave_mii_bus->priv = (void *)ds;
  54         ds->slave_mii_bus->name = "dsa slave smi";
  55         ds->slave_mii_bus->read = dsa_slave_phy_read;
  56         ds->slave_mii_bus->write = dsa_slave_phy_write;
  57         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  58                  ds->dst->tree, ds->index);
  59         ds->slave_mii_bus->parent = ds->dev;
  60         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  61 }
  62
  63
  64 /* slave device handling ****************************************************/
  65 static int dsa_slave_get_iflink(const struct net_device *dev)
  66 {
  67         struct dsa_slave_priv *p = netdev_priv(dev);
  68
  69         return dsa_master_netdev(p)->ifindex;
  70 }
  71
  72 static int dsa_slave_open(struct net_device *dev)
  73 {
  74         struct dsa_slave_priv *p = netdev_priv(dev);
  75         struct dsa_port *dp = p->dp;
  76         struct dsa_switch *ds = dp->ds;
  77         struct net_device *master = dsa_master_netdev(p);
  78         u8 stp_state = dp->bridge_dev ? 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->ops->port_enable) {
 102                 err = ds->ops->port_enable(ds, p->dp->index, p->phy);
 103                 if (err)
 104                         goto clear_promisc;
 105         }
 106
 107         dsa_port_set_state_now(p->dp, 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, -1);
 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 = dsa_master_netdev(p);
 131         struct dsa_switch *ds = p->dp->ds;
 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->ops->port_disable)
 147                 ds->ops->port_disable(ds, p->dp->index, p->phy);
 148
 149         dsa_port_set_state_now(p->dp, BR_STATE_DISABLED);
 150
 151         return 0;
 152 }
 153
 154 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 155 {
 156         struct dsa_slave_priv *p = netdev_priv(dev);
 157         struct net_device *master = dsa_master_netdev(p);
 158
 159         if (change & IFF_ALLMULTI)
 160                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 161         if (change & IFF_PROMISC)
 162                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 163 }
 164
 165 static void dsa_slave_set_rx_mode(struct net_device *dev)
 166 {
 167         struct dsa_slave_priv *p = netdev_priv(dev);
 168         struct net_device *master = dsa_master_netdev(p);
 169
 170         dev_mc_sync(master, dev);
 171         dev_uc_sync(master, dev);
 172 }
 173
 174 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 175 {
 176         struct dsa_slave_priv *p = netdev_priv(dev);
 177         struct net_device *master = dsa_master_netdev(p);
 178         struct sockaddr *addr = a;
 179         int err;
 180
 181         if (!is_valid_ether_addr(addr->sa_data))
 182                 return -EADDRNOTAVAIL;
 183
 184         if (!(dev->flags & IFF_UP))
 185                 goto out;
 186
 187         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 188                 err = dev_uc_add(master, addr->sa_data);
 189                 if (err < 0)
 190                         return err;
 191         }
 192
 193         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 194                 dev_uc_del(master, dev->dev_addr);
 195
 196 out:
 197         ether_addr_copy(dev->dev_addr, addr->sa_data);
 198
 199         return 0;
 200 }
 201
 202 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 203 {
 204         struct dsa_slave_priv *p = netdev_priv(dev);
 205
 206         if (p->phy != NULL)
 207                 return phy_mii_ioctl(p->phy, ifr, cmd);
 208
 209         return -EOPNOTSUPP;
 210 }
 211
 212 static int dsa_slave_port_attr_set(struct net_device *dev,
 213                                    const struct switchdev_attr *attr,
 214                                    struct switchdev_trans *trans)
 215 {
 216         struct dsa_slave_priv *p = netdev_priv(dev);
 217         struct dsa_port *dp = p->dp;
 218         int ret;
 219
 220         switch (attr->id) {
 221         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 222                 ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
 223                 break;
 224         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 225                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 226                                               trans);
 227                 break;
 228         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 229                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
 230                 break;
 231         default:
 232                 ret = -EOPNOTSUPP;
 233                 break;
 234         }
 235
 236         return ret;
 237 }
 238
 239 static int dsa_slave_port_obj_add(struct net_device *dev,
 240                                   const struct switchdev_obj *obj,
 241                                   struct switchdev_trans *trans)
 242 {
 243         struct dsa_slave_priv *p = netdev_priv(dev);
 244         struct dsa_port *dp = p->dp;
 245         int err;
 246
 247         /* For the prepare phase, ensure the full set of changes is feasable in
 248          * one go in order to signal a failure properly. If an operation is not
 249          * supported, return -EOPNOTSUPP.
 250          */
 251
 252         switch (obj->id) {
 253         case SWITCHDEV_OBJ_ID_PORT_FDB:
 254                 err = dsa_port_fdb_add(dp, SWITCHDEV_OBJ_PORT_FDB(obj), trans);
 255                 break;
 256         case SWITCHDEV_OBJ_ID_PORT_MDB:
 257                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 258                 break;
 259         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 260                 err = dsa_port_vlan_add(dp, SWITCHDEV_OBJ_PORT_VLAN(obj),
 261                                         trans);
 262                 break;
 263         default:
 264                 err = -EOPNOTSUPP;
 265                 break;
 266         }
 267
 268         return err;
 269 }
 270
 271 static int dsa_slave_port_obj_del(struct net_device *dev,
 272                                   const struct switchdev_obj *obj)
 273 {
 274         struct dsa_slave_priv *p = netdev_priv(dev);
 275         struct dsa_port *dp = p->dp;
 276         int err;
 277
 278         switch (obj->id) {
 279         case SWITCHDEV_OBJ_ID_PORT_FDB:
 280                 err = dsa_port_fdb_del(dp, SWITCHDEV_OBJ_PORT_FDB(obj));
 281                 break;
 282         case SWITCHDEV_OBJ_ID_PORT_MDB:
 283                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 284                 break;
 285         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 286                 err = dsa_port_vlan_del(dp, SWITCHDEV_OBJ_PORT_VLAN(obj));
 287                 break;
 288         default:
 289                 err = -EOPNOTSUPP;
 290                 break;
 291         }
 292
 293         return err;
 294 }
 295
 296 static int dsa_slave_port_obj_dump(struct net_device *dev,
 297                                    struct switchdev_obj *obj,
 298                                    switchdev_obj_dump_cb_t *cb)
 299 {
 300         struct dsa_slave_priv *p = netdev_priv(dev);
 301         struct dsa_port *dp = p->dp;
 302         int err;
 303
 304         switch (obj->id) {
 305         case SWITCHDEV_OBJ_ID_PORT_FDB:
 306                 err = dsa_port_fdb_dump(dp, SWITCHDEV_OBJ_PORT_FDB(obj), cb);
 307                 break;
 308         case SWITCHDEV_OBJ_ID_PORT_MDB:
 309                 err = dsa_port_mdb_dump(dp, SWITCHDEV_OBJ_PORT_MDB(obj), cb);
 310                 break;
 311         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 312                 err = dsa_port_vlan_dump(dp, SWITCHDEV_OBJ_PORT_VLAN(obj), cb);
 313                 break;
 314         default:
 315                 err = -EOPNOTSUPP;
 316                 break;
 317         }
 318
 319         return err;
 320 }
 321
 322 static int dsa_slave_port_attr_get(struct net_device *dev,
 323                                    struct switchdev_attr *attr)
 324 {
 325         struct dsa_slave_priv *p = netdev_priv(dev);
 326         struct dsa_switch *ds = p->dp->ds;
 327
 328         switch (attr->id) {
 329         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 330                 attr->u.ppid.id_len = sizeof(ds->index);
 331                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 332                 break;
 333         default:
 334                 return -EOPNOTSUPP;
 335         }
 336
 337         return 0;
 338 }
 339
 340 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 341                                                struct sk_buff *skb)
 342 {
 343 #ifdef CONFIG_NET_POLL_CONTROLLER
 344         if (p->netpoll)
 345                 netpoll_send_skb(p->netpoll, skb);
 346 #else
 347         BUG();
 348 #endif
 349         return NETDEV_TX_OK;
 350 }
 351
 352 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 353 {
 354         struct dsa_slave_priv *p = netdev_priv(dev);
 355         struct pcpu_sw_netstats *s;
 356         struct sk_buff *nskb;
 357
 358         s = this_cpu_ptr(p->stats64);
 359         u64_stats_update_begin(&s->syncp);
 360         s->tx_packets++;
 361         s->tx_bytes += skb->len;
 362         u64_stats_update_end(&s->syncp);
 363
 364         /* Transmit function may have to reallocate the original SKB,
 365          * in which case it must have freed it. Only free it here on error.
 366          */
 367         nskb = p->xmit(skb, dev);
 368         if (!nskb) {
 369                 kfree_skb(skb);
 370                 return NETDEV_TX_OK;
 371         }
 372
 373         /* SKB for netpoll still need to be mangled with the protocol-specific
 374          * tag to be successfully transmitted
 375          */
 376         if (unlikely(netpoll_tx_running(dev)))
 377                 return dsa_netpoll_send_skb(p, nskb);
 378
 379         /* Queue the SKB for transmission on the parent interface, but
 380          * do not modify its EtherType
 381          */
 382         nskb->dev = dsa_master_netdev(p);
 383         dev_queue_xmit(nskb);
 384
 385         return NETDEV_TX_OK;
 386 }
 387
 388 /* ethtool operations *******************************************************/
 389 static int
 390 dsa_slave_get_link_ksettings(struct net_device *dev,
 391                              struct ethtool_link_ksettings *cmd)
 392 {
 393         struct dsa_slave_priv *p = netdev_priv(dev);
 394
 395         if (!p->phy)
 396                 return -EOPNOTSUPP;
 397
 398         phy_ethtool_ksettings_get(p->phy, cmd);
 399
 400         return 0;
 401 }
 402
 403 static int
 404 dsa_slave_set_link_ksettings(struct net_device *dev,
 405                              const struct ethtool_link_ksettings *cmd)
 406 {
 407         struct dsa_slave_priv *p = netdev_priv(dev);
 408
 409         if (p->phy != NULL)
 410                 return phy_ethtool_ksettings_set(p->phy, cmd);
 411
 412         return -EOPNOTSUPP;
 413 }
 414
 415 static void dsa_slave_get_drvinfo(struct net_device *dev,
 416                                   struct ethtool_drvinfo *drvinfo)
 417 {
 418         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 419         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 420         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 421 }
 422
 423 static int dsa_slave_get_regs_len(struct net_device *dev)
 424 {
 425         struct dsa_slave_priv *p = netdev_priv(dev);
 426         struct dsa_switch *ds = p->dp->ds;
 427
 428         if (ds->ops->get_regs_len)
 429                 return ds->ops->get_regs_len(ds, p->dp->index);
 430
 431         return -EOPNOTSUPP;
 432 }
 433
 434 static void
 435 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 436 {
 437         struct dsa_slave_priv *p = netdev_priv(dev);
 438         struct dsa_switch *ds = p->dp->ds;
 439
 440         if (ds->ops->get_regs)
 441                 ds->ops->get_regs(ds, p->dp->index, regs, _p);
 442 }
 443
 444 static int dsa_slave_nway_reset(struct net_device *dev)
 445 {
 446         struct dsa_slave_priv *p = netdev_priv(dev);
 447
 448         if (p->phy != NULL)
 449                 return genphy_restart_aneg(p->phy);
 450
 451         return -EOPNOTSUPP;
 452 }
 453
 454 static u32 dsa_slave_get_link(struct net_device *dev)
 455 {
 456         struct dsa_slave_priv *p = netdev_priv(dev);
 457
 458         if (p->phy != NULL) {
 459                 genphy_update_link(p->phy);
 460                 return p->phy->link;
 461         }
 462
 463         return -EOPNOTSUPP;
 464 }
 465
 466 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 467 {
 468         struct dsa_slave_priv *p = netdev_priv(dev);
 469         struct dsa_switch *ds = p->dp->ds;
 470
 471         if (ds->cd && ds->cd->eeprom_len)
 472                 return ds->cd->eeprom_len;
 473
 474         if (ds->ops->get_eeprom_len)
 475                 return ds->ops->get_eeprom_len(ds);
 476
 477         return 0;
 478 }
 479
 480 static int dsa_slave_get_eeprom(struct net_device *dev,
 481                                 struct ethtool_eeprom *eeprom, u8 *data)
 482 {
 483         struct dsa_slave_priv *p = netdev_priv(dev);
 484         struct dsa_switch *ds = p->dp->ds;
 485
 486         if (ds->ops->get_eeprom)
 487                 return ds->ops->get_eeprom(ds, eeprom, data);
 488
 489         return -EOPNOTSUPP;
 490 }
 491
 492 static int dsa_slave_set_eeprom(struct net_device *dev,
 493                                 struct ethtool_eeprom *eeprom, u8 *data)
 494 {
 495         struct dsa_slave_priv *p = netdev_priv(dev);
 496         struct dsa_switch *ds = p->dp->ds;
 497
 498         if (ds->ops->set_eeprom)
 499                 return ds->ops->set_eeprom(ds, eeprom, data);
 500
 501         return -EOPNOTSUPP;
 502 }
 503
 504 static void dsa_slave_get_strings(struct net_device *dev,
 505                                   uint32_t stringset, uint8_t *data)
 506 {
 507         struct dsa_slave_priv *p = netdev_priv(dev);
 508         struct dsa_switch *ds = p->dp->ds;
 509
 510         if (stringset == ETH_SS_STATS) {
 511                 int len = ETH_GSTRING_LEN;
 512
 513                 strncpy(data, "tx_packets", len);
 514                 strncpy(data + len, "tx_bytes", len);
 515                 strncpy(data + 2 * len, "rx_packets", len);
 516                 strncpy(data + 3 * len, "rx_bytes", len);
 517                 if (ds->ops->get_strings)
 518                         ds->ops->get_strings(ds, p->dp->index, data + 4 * len);
 519         }
 520 }
 521
 522 static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
 523                                            struct ethtool_stats *stats,
 524                                            uint64_t *data)
 525 {
 526         struct dsa_switch_tree *dst = dev->dsa_ptr;
 527         struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
 528         struct dsa_switch *ds = cpu_dp->ds;
 529         s8 cpu_port = cpu_dp->index;
 530         int count = 0;
 531
 532         if (cpu_dp->ethtool_ops.get_sset_count) {
 533                 count = cpu_dp->ethtool_ops.get_sset_count(dev, ETH_SS_STATS);
 534                 cpu_dp->ethtool_ops.get_ethtool_stats(dev, stats, data);
 535         }
 536
 537         if (ds->ops->get_ethtool_stats)
 538                 ds->ops->get_ethtool_stats(ds, cpu_port, data + count);
 539 }
 540
 541 static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
 542 {
 543         struct dsa_switch_tree *dst = dev->dsa_ptr;
 544         struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
 545         struct dsa_switch *ds = cpu_dp->ds;
 546         int count = 0;
 547
 548         if (cpu_dp->ethtool_ops.get_sset_count)
 549                 count += cpu_dp->ethtool_ops.get_sset_count(dev, sset);
 550
 551         if (sset == ETH_SS_STATS && ds->ops->get_sset_count)
 552                 count += ds->ops->get_sset_count(ds);
 553
 554         return count;
 555 }
 556
 557 static void dsa_cpu_port_get_strings(struct net_device *dev,
 558                                      uint32_t stringset, uint8_t *data)
 559 {
 560         struct dsa_switch_tree *dst = dev->dsa_ptr;
 561         struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
 562         struct dsa_switch *ds = cpu_dp->ds;
 563         s8 cpu_port = cpu_dp->index;
 564         int len = ETH_GSTRING_LEN;
 565         int mcount = 0, count;
 566         unsigned int i;
 567         uint8_t pfx[4];
 568         uint8_t *ndata;
 569
 570         snprintf(pfx, sizeof(pfx), "p%.2d", cpu_port);
 571         /* We do not want to be NULL-terminated, since this is a prefix */
 572         pfx[sizeof(pfx) - 1] = '_';
 573
 574         if (cpu_dp->ethtool_ops.get_sset_count) {
 575                 mcount = cpu_dp->ethtool_ops.get_sset_count(dev, ETH_SS_STATS);
 576                 cpu_dp->ethtool_ops.get_strings(dev, stringset, data);
 577         }
 578
 579         if (stringset == ETH_SS_STATS && ds->ops->get_strings) {
 580                 ndata = data + mcount * len;
 581                 /* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
 582                  * the output after to prepend our CPU port prefix we
 583                  * constructed earlier
 584                  */
 585                 ds->ops->get_strings(ds, cpu_port, ndata);
 586                 count = ds->ops->get_sset_count(ds);
 587                 for (i = 0; i < count; i++) {
 588                         memmove(ndata + (i * len + sizeof(pfx)),
 589                                 ndata + i * len, len - sizeof(pfx));
 590                         memcpy(ndata + i * len, pfx, sizeof(pfx));
 591                 }
 592         }
 593 }
 594
 595 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 596                                         struct ethtool_stats *stats,
 597                                         uint64_t *data)
 598 {
 599         struct dsa_slave_priv *p = netdev_priv(dev);
 600         struct dsa_switch *ds = p->dp->ds;
 601         struct pcpu_sw_netstats *s;
 602         unsigned int start;
 603         int i;
 604
 605         for_each_possible_cpu(i) {
 606                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 607
 608                 s = per_cpu_ptr(p->stats64, i);
 609                 do {
 610                         start = u64_stats_fetch_begin_irq(&s->syncp);
 611                         tx_packets = s->tx_packets;
 612                         tx_bytes = s->tx_bytes;
 613                         rx_packets = s->rx_packets;
 614                         rx_bytes = s->rx_bytes;
 615                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 616                 data[0] += tx_packets;
 617                 data[1] += tx_bytes;
 618                 data[2] += rx_packets;
 619                 data[3] += rx_bytes;
 620         }
 621         if (ds->ops->get_ethtool_stats)
 622                 ds->ops->get_ethtool_stats(ds, p->dp->index, data + 4);
 623 }
 624
 625 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 626 {
 627         struct dsa_slave_priv *p = netdev_priv(dev);
 628         struct dsa_switch *ds = p->dp->ds;
 629
 630         if (sset == ETH_SS_STATS) {
 631                 int count;
 632
 633                 count = 4;
 634                 if (ds->ops->get_sset_count)
 635                         count += ds->ops->get_sset_count(ds);
 636
 637                 return count;
 638         }
 639
 640         return -EOPNOTSUPP;
 641 }
 642
 643 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 644 {
 645         struct dsa_slave_priv *p = netdev_priv(dev);
 646         struct dsa_switch *ds = p->dp->ds;
 647
 648         if (ds->ops->get_wol)
 649                 ds->ops->get_wol(ds, p->dp->index, w);
 650 }
 651
 652 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 653 {
 654         struct dsa_slave_priv *p = netdev_priv(dev);
 655         struct dsa_switch *ds = p->dp->ds;
 656         int ret = -EOPNOTSUPP;
 657
 658         if (ds->ops->set_wol)
 659                 ret = ds->ops->set_wol(ds, p->dp->index, w);
 660
 661         return ret;
 662 }
 663
 664 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 665 {
 666         struct dsa_slave_priv *p = netdev_priv(dev);
 667         struct dsa_switch *ds = p->dp->ds;
 668         int ret;
 669
 670         /* Port's PHY and MAC both need to be EEE capable */
 671         if (!p->phy)
 672                 return -ENODEV;
 673
 674         if (!ds->ops->set_mac_eee)
 675                 return -EOPNOTSUPP;
 676
 677         ret = ds->ops->set_mac_eee(ds, p->dp->index, e);
 678         if (ret)
 679                 return ret;
 680
 681         if (e->eee_enabled) {
 682                 ret = phy_init_eee(p->phy, 0);
 683                 if (ret)
 684                         return ret;
 685         }
 686
 687         return phy_ethtool_set_eee(p->phy, e);
 688 }
 689
 690 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 691 {
 692         struct dsa_slave_priv *p = netdev_priv(dev);
 693         struct dsa_switch *ds = p->dp->ds;
 694         int ret;
 695
 696         /* Port's PHY and MAC both need to be EEE capable */
 697         if (!p->phy)
 698                 return -ENODEV;
 699
 700         if (!ds->ops->get_mac_eee)
 701                 return -EOPNOTSUPP;
 702
 703         ret = ds->ops->get_mac_eee(ds, p->dp->index, e);
 704         if (ret)
 705                 return ret;
 706
 707         return phy_ethtool_get_eee(p->phy, e);
 708 }
 709
 710 #ifdef CONFIG_NET_POLL_CONTROLLER
 711 static int dsa_slave_netpoll_setup(struct net_device *dev,
 712                                    struct netpoll_info *ni)
 713 {
 714         struct dsa_slave_priv *p = netdev_priv(dev);
 715         struct net_device *master = dsa_master_netdev(p);
 716         struct netpoll *netpoll;
 717         int err = 0;
 718
 719         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 720         if (!netpoll)
 721                 return -ENOMEM;
 722
 723         err = __netpoll_setup(netpoll, master);
 724         if (err) {
 725                 kfree(netpoll);
 726                 goto out;
 727         }
 728
 729         p->netpoll = netpoll;
 730 out:
 731         return err;
 732 }
 733
 734 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 735 {
 736         struct dsa_slave_priv *p = netdev_priv(dev);
 737         struct netpoll *netpoll = p->netpoll;
 738
 739         if (!netpoll)
 740                 return;
 741
 742         p->netpoll = NULL;
 743
 744         __netpoll_free_async(netpoll);
 745 }
 746
 747 static void dsa_slave_poll_controller(struct net_device *dev)
 748 {
 749 }
 750 #endif
 751
 752 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 753                                         char *name, size_t len)
 754 {
 755         struct dsa_slave_priv *p = netdev_priv(dev);
 756
 757         if (snprintf(name, len, "p%d", p->dp->index) >= len)
 758                 return -EINVAL;
 759
 760         return 0;
 761 }
 762
 763 static struct dsa_mall_tc_entry *
 764 dsa_slave_mall_tc_entry_find(struct dsa_slave_priv *p,
 765                              unsigned long cookie)
 766 {
 767         struct dsa_mall_tc_entry *mall_tc_entry;
 768
 769         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 770                 if (mall_tc_entry->cookie == cookie)
 771                         return mall_tc_entry;
 772
 773         return NULL;
 774 }
 775
 776 static int dsa_slave_add_cls_matchall(struct net_device *dev,
 777                                       __be16 protocol,
 778                                       struct tc_cls_matchall_offload *cls,
 779                                       bool ingress)
 780 {
 781         struct dsa_slave_priv *p = netdev_priv(dev);
 782         struct dsa_mall_tc_entry *mall_tc_entry;
 783         struct dsa_switch *ds = p->dp->ds;
 784         struct net *net = dev_net(dev);
 785         struct dsa_slave_priv *to_p;
 786         struct net_device *to_dev;
 787         const struct tc_action *a;
 788         int err = -EOPNOTSUPP;
 789         LIST_HEAD(actions);
 790         int ifindex;
 791
 792         if (!ds->ops->port_mirror_add)
 793                 return err;
 794
 795         if (!tcf_exts_has_one_action(cls->exts))
 796                 return err;
 797
 798         tcf_exts_to_list(cls->exts, &actions);
 799         a = list_first_entry(&actions, struct tc_action, list);
 800
 801         if (is_tcf_mirred_egress_mirror(a) && protocol == htons(ETH_P_ALL)) {
 802                 struct dsa_mall_mirror_tc_entry *mirror;
 803
 804                 ifindex = tcf_mirred_ifindex(a);
 805                 to_dev = __dev_get_by_index(net, ifindex);
 806                 if (!to_dev)
 807                         return -EINVAL;
 808
 809                 if (!dsa_slave_dev_check(to_dev))
 810                         return -EOPNOTSUPP;
 811
 812                 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 813                 if (!mall_tc_entry)
 814                         return -ENOMEM;
 815
 816                 mall_tc_entry->cookie = cls->cookie;
 817                 mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 818                 mirror = &mall_tc_entry->mirror;
 819
 820                 to_p = netdev_priv(to_dev);
 821
 822                 mirror->to_local_port = to_p->dp->index;
 823                 mirror->ingress = ingress;
 824
 825                 err = ds->ops->port_mirror_add(ds, p->dp->index, mirror,
 826                                                ingress);
 827                 if (err) {
 828                         kfree(mall_tc_entry);
 829                         return err;
 830                 }
 831
 832                 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 833         }
 834
 835         return 0;
 836 }
 837
 838 static void dsa_slave_del_cls_matchall(struct net_device *dev,
 839                                        struct tc_cls_matchall_offload *cls)
 840 {
 841         struct dsa_slave_priv *p = netdev_priv(dev);
 842         struct dsa_mall_tc_entry *mall_tc_entry;
 843         struct dsa_switch *ds = p->dp->ds;
 844
 845         if (!ds->ops->port_mirror_del)
 846                 return;
 847
 848         mall_tc_entry = dsa_slave_mall_tc_entry_find(p, cls->cookie);
 849         if (!mall_tc_entry)
 850                 return;
 851
 852         list_del(&mall_tc_entry->list);
 853
 854         switch (mall_tc_entry->type) {
 855         case DSA_PORT_MALL_MIRROR:
 856                 ds->ops->port_mirror_del(ds, p->dp->index,
 857                                          &mall_tc_entry->mirror);
 858                 break;
 859         default:
 860                 WARN_ON(1);
 861         }
 862
 863         kfree(mall_tc_entry);
 864 }
 865
 866 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
 867                               u32 handle, u32 chain_index, __be16 protocol,
 868                               struct tc_to_netdev *tc)
 869 {
 870         bool ingress = TC_H_MAJ(handle) == TC_H_MAJ(TC_H_INGRESS);
 871
 872         if (chain_index)
 873                 return -EOPNOTSUPP;
 874
 875         switch (type) {
 876         case TC_SETUP_MATCHALL:
 877                 switch (tc->cls_mall->command) {
 878                 case TC_CLSMATCHALL_REPLACE:
 879                         return dsa_slave_add_cls_matchall(dev, protocol,
 880                                                           tc->cls_mall,
 881                                                           ingress);
 882                 case TC_CLSMATCHALL_DESTROY:
 883                         dsa_slave_del_cls_matchall(dev, tc->cls_mall);
 884                         return 0;
 885                 }
 886         default:
 887                 return -EOPNOTSUPP;
 888         }
 889 }
 890
 891 static void dsa_slave_get_stats64(struct net_device *dev,
 892                                   struct rtnl_link_stats64 *stats)
 893 {
 894         struct dsa_slave_priv *p = netdev_priv(dev);
 895         struct pcpu_sw_netstats *s;
 896         unsigned int start;
 897         int i;
 898
 899         netdev_stats_to_stats64(stats, &dev->stats);
 900         for_each_possible_cpu(i) {
 901                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 902
 903                 s = per_cpu_ptr(p->stats64, i);
 904                 do {
 905                         start = u64_stats_fetch_begin_irq(&s->syncp);
 906                         tx_packets = s->tx_packets;
 907                         tx_bytes = s->tx_bytes;
 908                         rx_packets = s->rx_packets;
 909                         rx_bytes = s->rx_bytes;
 910                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 911
 912                 stats->tx_packets += tx_packets;
 913                 stats->tx_bytes += tx_bytes;
 914                 stats->rx_packets += rx_packets;
 915                 stats->rx_bytes += rx_bytes;
 916         }
 917 }
 918
 919 void dsa_cpu_port_ethtool_init(struct ethtool_ops *ops)
 920 {
 921         ops->get_sset_count = dsa_cpu_port_get_sset_count;
 922         ops->get_ethtool_stats = dsa_cpu_port_get_ethtool_stats;
 923         ops->get_strings = dsa_cpu_port_get_strings;
 924 }
 925
 926 static int dsa_slave_get_rxnfc(struct net_device *dev,
 927                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
 928 {
 929         struct dsa_slave_priv *p = netdev_priv(dev);
 930         struct dsa_switch *ds = p->dp->ds;
 931
 932         if (!ds->ops->get_rxnfc)
 933                 return -EOPNOTSUPP;
 934
 935         return ds->ops->get_rxnfc(ds, p->dp->index, nfc, rule_locs);
 936 }
 937
 938 static int dsa_slave_set_rxnfc(struct net_device *dev,
 939                                struct ethtool_rxnfc *nfc)
 940 {
 941         struct dsa_slave_priv *p = netdev_priv(dev);
 942         struct dsa_switch *ds = p->dp->ds;
 943
 944         if (!ds->ops->set_rxnfc)
 945                 return -EOPNOTSUPP;
 946
 947         return ds->ops->set_rxnfc(ds, p->dp->index, nfc);
 948 }
 949
 950 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 951         .get_drvinfo            = dsa_slave_get_drvinfo,
 952         .get_regs_len           = dsa_slave_get_regs_len,
 953         .get_regs               = dsa_slave_get_regs,
 954         .nway_reset             = dsa_slave_nway_reset,
 955         .get_link               = dsa_slave_get_link,
 956         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 957         .get_eeprom             = dsa_slave_get_eeprom,
 958         .set_eeprom             = dsa_slave_set_eeprom,
 959         .get_strings            = dsa_slave_get_strings,
 960         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 961         .get_sset_count         = dsa_slave_get_sset_count,
 962         .set_wol                = dsa_slave_set_wol,
 963         .get_wol                = dsa_slave_get_wol,
 964         .set_eee                = dsa_slave_set_eee,
 965         .get_eee                = dsa_slave_get_eee,
 966         .get_link_ksettings     = dsa_slave_get_link_ksettings,
 967         .set_link_ksettings     = dsa_slave_set_link_ksettings,
 968         .get_rxnfc              = dsa_slave_get_rxnfc,
 969         .set_rxnfc              = dsa_slave_set_rxnfc,
 970 };
 971
 972 static const struct net_device_ops dsa_slave_netdev_ops = {
 973         .ndo_open               = dsa_slave_open,
 974         .ndo_stop               = dsa_slave_close,
 975         .ndo_start_xmit         = dsa_slave_xmit,
 976         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 977         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 978         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 979         .ndo_fdb_add            = switchdev_port_fdb_add,
 980         .ndo_fdb_del            = switchdev_port_fdb_del,
 981         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 982         .ndo_do_ioctl           = dsa_slave_ioctl,
 983         .ndo_get_iflink         = dsa_slave_get_iflink,
 984 #ifdef CONFIG_NET_POLL_CONTROLLER
 985         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 986         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 987         .ndo_poll_controller    = dsa_slave_poll_controller,
 988 #endif
 989         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 990         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 991         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 992         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
 993         .ndo_setup_tc           = dsa_slave_setup_tc,
 994         .ndo_get_stats64        = dsa_slave_get_stats64,
 995 };
 996
 997 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 998         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 999         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
1000         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
1001         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
1002         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
1003 };
1004
1005 static struct device_type dsa_type = {
1006         .name   = "dsa",
1007 };
1008
1009 static void dsa_slave_adjust_link(struct net_device *dev)
1010 {
1011         struct dsa_slave_priv *p = netdev_priv(dev);
1012         struct dsa_switch *ds = p->dp->ds;
1013         unsigned int status_changed = 0;
1014
1015         if (p->old_link != p->phy->link) {
1016                 status_changed = 1;
1017                 p->old_link = p->phy->link;
1018         }
1019
1020         if (p->old_duplex != p->phy->duplex) {
1021                 status_changed = 1;
1022                 p->old_duplex = p->phy->duplex;
1023         }
1024
1025         if (p->old_pause != p->phy->pause) {
1026                 status_changed = 1;
1027                 p->old_pause = p->phy->pause;
1028         }
1029
1030         if (ds->ops->adjust_link && status_changed)
1031                 ds->ops->adjust_link(ds, p->dp->index, p->phy);
1032
1033         if (status_changed)
1034                 phy_print_status(p->phy);
1035 }
1036
1037 static int dsa_slave_fixed_link_update(struct net_device *dev,
1038                                        struct fixed_phy_status *status)
1039 {
1040         struct dsa_slave_priv *p;
1041         struct dsa_switch *ds;
1042
1043         if (dev) {
1044                 p = netdev_priv(dev);
1045                 ds = p->dp->ds;
1046                 if (ds->ops->fixed_link_update)
1047                         ds->ops->fixed_link_update(ds, p->dp->index, status);
1048         }
1049
1050         return 0;
1051 }
1052
1053 /* slave device setup *******************************************************/
1054 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
1055                                  struct net_device *slave_dev,
1056                                  int addr)
1057 {
1058         struct dsa_switch *ds = p->dp->ds;
1059
1060         p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
1061         if (!p->phy) {
1062                 netdev_err(slave_dev, "no phy at %d\n", addr);
1063                 return -ENODEV;
1064         }
1065
1066         /* Use already configured phy mode */
1067         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1068                 p->phy_interface = p->phy->interface;
1069         return phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1070                                   p->phy_interface);
1071 }
1072
1073 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1074                                 struct net_device *slave_dev)
1075 {
1076         struct dsa_switch *ds = p->dp->ds;
1077         struct device_node *phy_dn, *port_dn;
1078         bool phy_is_fixed = false;
1079         u32 phy_flags = 0;
1080         int mode, ret;
1081
1082         port_dn = p->dp->dn;
1083         mode = of_get_phy_mode(port_dn);
1084         if (mode < 0)
1085                 mode = PHY_INTERFACE_MODE_NA;
1086         p->phy_interface = mode;
1087
1088         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1089         if (!phy_dn && of_phy_is_fixed_link(port_dn)) {
1090                 /* In the case of a fixed PHY, the DT node associated
1091                  * to the fixed PHY is the Port DT node
1092                  */
1093                 ret = of_phy_register_fixed_link(port_dn);
1094                 if (ret) {
1095                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1096                         return ret;
1097                 }
1098                 phy_is_fixed = true;
1099                 phy_dn = of_node_get(port_dn);
1100         }
1101
1102         if (ds->ops->get_phy_flags)
1103                 phy_flags = ds->ops->get_phy_flags(ds, p->dp->index);
1104
1105         if (phy_dn) {
1106                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1107
1108                 /* If this PHY address is part of phys_mii_mask, which means
1109                  * that we need to divert reads and writes to/from it, then we
1110                  * want to bind this device using the slave MII bus created by
1111                  * DSA to make that happen.
1112                  */
1113                 if (!phy_is_fixed && phy_id >= 0 &&
1114                     (ds->phys_mii_mask & (1 << phy_id))) {
1115                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1116                         if (ret) {
1117                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1118                                 of_node_put(phy_dn);
1119                                 return ret;
1120                         }
1121                 } else {
1122                         p->phy = of_phy_connect(slave_dev, phy_dn,
1123                                                 dsa_slave_adjust_link,
1124                                                 phy_flags,
1125                                                 p->phy_interface);
1126                 }
1127
1128                 of_node_put(phy_dn);
1129         }
1130
1131         if (p->phy && phy_is_fixed)
1132                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1133
1134         /* We could not connect to a designated PHY, so use the switch internal
1135          * MDIO bus instead
1136          */
1137         if (!p->phy) {
1138                 ret = dsa_slave_phy_connect(p, slave_dev, p->dp->index);
1139                 if (ret) {
1140                         netdev_err(slave_dev, "failed to connect to port %d: %d\n",
1141                                    p->dp->index, ret);
1142                         if (phy_is_fixed)
1143                                 of_phy_deregister_fixed_link(port_dn);
1144                         return ret;
1145                 }
1146         }
1147
1148         phy_attached_info(p->phy);
1149
1150         return 0;
1151 }
1152
1153 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1154 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1155                                             struct netdev_queue *txq,
1156                                             void *_unused)
1157 {
1158         lockdep_set_class(&txq->_xmit_lock,
1159                           &dsa_slave_netdev_xmit_lock_key);
1160 }
1161
1162 int dsa_slave_suspend(struct net_device *slave_dev)
1163 {
1164         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1165
1166         netif_device_detach(slave_dev);
1167
1168         if (p->phy) {
1169                 phy_stop(p->phy);
1170                 p->old_pause = -1;
1171                 p->old_link = -1;
1172                 p->old_duplex = -1;
1173                 phy_suspend(p->phy);
1174         }
1175
1176         return 0;
1177 }
1178
1179 int dsa_slave_resume(struct net_device *slave_dev)
1180 {
1181         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1182
1183         netif_device_attach(slave_dev);
1184
1185         if (p->phy) {
1186                 phy_resume(p->phy);
1187                 phy_start(p->phy);
1188         }
1189
1190         return 0;
1191 }
1192
1193 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1194                      int port, const char *name)
1195 {
1196         struct dsa_switch_tree *dst = ds->dst;
1197         struct net_device *master;
1198         struct net_device *slave_dev;
1199         struct dsa_slave_priv *p;
1200         struct dsa_port *cpu_dp;
1201         int ret;
1202
1203         cpu_dp = ds->dst->cpu_dp;
1204         master = cpu_dp->netdev;
1205
1206         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1207                                  NET_NAME_UNKNOWN, ether_setup);
1208         if (slave_dev == NULL)
1209                 return -ENOMEM;
1210
1211         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1212         slave_dev->hw_features |= NETIF_F_HW_TC;
1213         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1214         eth_hw_addr_inherit(slave_dev, master);
1215         slave_dev->priv_flags |= IFF_NO_QUEUE;
1216         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1217         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1218         slave_dev->min_mtu = 0;
1219         slave_dev->max_mtu = ETH_MAX_MTU;
1220         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1221
1222         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1223                                  NULL);
1224
1225         SET_NETDEV_DEV(slave_dev, parent);
1226         slave_dev->dev.of_node = ds->ports[port].dn;
1227         slave_dev->vlan_features = master->vlan_features;
1228
1229         p = netdev_priv(slave_dev);
1230         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1231         if (!p->stats64) {
1232                 free_netdev(slave_dev);
1233                 return -ENOMEM;
1234         }
1235         p->dp = &ds->ports[port];
1236         INIT_LIST_HEAD(&p->mall_tc_list);
1237         p->xmit = dst->tag_ops->xmit;
1238
1239         p->old_pause = -1;
1240         p->old_link = -1;
1241         p->old_duplex = -1;
1242
1243         ds->ports[port].netdev = slave_dev;
1244         ret = register_netdev(slave_dev);
1245         if (ret) {
1246                 netdev_err(master, "error %d registering interface %s\n",
1247                            ret, slave_dev->name);
1248                 ds->ports[port].netdev = NULL;
1249                 free_percpu(p->stats64);
1250                 free_netdev(slave_dev);
1251                 return ret;
1252         }
1253
1254         netif_carrier_off(slave_dev);
1255
1256         ret = dsa_slave_phy_setup(p, slave_dev);
1257         if (ret) {
1258                 netdev_err(master, "error %d setting up slave phy\n", ret);
1259                 unregister_netdev(slave_dev);
1260                 free_percpu(p->stats64);
1261                 free_netdev(slave_dev);
1262                 return ret;
1263         }
1264
1265         return 0;
1266 }
1267
1268 void dsa_slave_destroy(struct net_device *slave_dev)
1269 {
1270         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1271         struct device_node *port_dn;
1272
1273         port_dn = p->dp->dn;
1274
1275         netif_carrier_off(slave_dev);
1276         if (p->phy) {
1277                 phy_disconnect(p->phy);
1278
1279                 if (of_phy_is_fixed_link(port_dn))
1280                         of_phy_deregister_fixed_link(port_dn);
1281         }
1282         unregister_netdev(slave_dev);
1283         free_percpu(p->stats64);
1284         free_netdev(slave_dev);
1285 }
1286
1287 static bool dsa_slave_dev_check(struct net_device *dev)
1288 {
1289         return dev->netdev_ops == &dsa_slave_netdev_ops;
1290 }
1291
1292 static int dsa_slave_changeupper(struct net_device *dev,
1293                                  struct netdev_notifier_changeupper_info *info)
1294 {
1295         struct dsa_slave_priv *p = netdev_priv(dev);
1296         struct dsa_port *dp = p->dp;
1297         int err = NOTIFY_DONE;
1298
1299         if (netif_is_bridge_master(info->upper_dev)) {
1300                 if (info->linking) {
1301                         err = dsa_port_bridge_join(dp, info->upper_dev);
1302                         err = notifier_from_errno(err);
1303                 } else {
1304                         dsa_port_bridge_leave(dp, info->upper_dev);
1305                         err = NOTIFY_OK;
1306                 }
1307         }
1308
1309         return err;
1310 }
1311
1312 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1313                                      unsigned long event, void *ptr)
1314 {
1315         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1316
1317         if (dev->netdev_ops != &dsa_slave_netdev_ops)
1318                 return NOTIFY_DONE;
1319
1320         if (event == NETDEV_CHANGEUPPER)
1321                 return dsa_slave_changeupper(dev, ptr);
1322
1323         return NOTIFY_DONE;
1324 }
1325
1326 static struct notifier_block dsa_slave_nb __read_mostly = {
1327         .notifier_call  = dsa_slave_netdevice_event,
1328 };
1329
1330 int dsa_slave_register_notifier(void)
1331 {
1332         return register_netdevice_notifier(&dsa_slave_nb);
1333 }
1334
1335 void dsa_slave_unregister_notifier(void)
1336 {
1337         int err;
1338
1339         err = unregister_netdevice_notifier(&dsa_slave_nb);
1340         if (err)
1341                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
1342 }