net/dsa/slave.c

   1 /*
   2  * net/dsa/slave.c - Slave device handling
   3  * Copyright (c) 2008-2009 Marvell Semiconductor
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/list.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/phy.h>
  15 #include <linux/phy_fixed.h>
  16 #include <linux/of_net.h>
  17 #include <linux/of_mdio.h>
  18 #include <linux/mdio.h>
  19 #include <net/rtnetlink.h>
  20 #include <net/pkt_cls.h>
  21 #include <net/tc_act/tc_mirred.h>
  22 #include <linux/if_bridge.h>
  23 #include <linux/netpoll.h>
  24
  25 #include "dsa_priv.h"
  26
  27 static bool dsa_slave_dev_check(struct net_device *dev);
  28
  29 /* slave mii_bus handling ***************************************************/
  30 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  31 {
  32         struct dsa_switch *ds = bus->priv;
  33
  34         if (ds->phys_mii_mask & (1 << addr))
  35                 return ds->ops->phy_read(ds, addr, reg);
  36
  37         return 0xffff;
  38 }
  39
  40 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  41 {
  42         struct dsa_switch *ds = bus->priv;
  43
  44         if (ds->phys_mii_mask & (1 << addr))
  45                 return ds->ops->phy_write(ds, addr, reg, val);
  46
  47         return 0;
  48 }
  49
  50 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  51 {
  52         ds->slave_mii_bus->priv = (void *)ds;
  53         ds->slave_mii_bus->name = "dsa slave smi";
  54         ds->slave_mii_bus->read = dsa_slave_phy_read;
  55         ds->slave_mii_bus->write = dsa_slave_phy_write;
  56         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  57                  ds->dst->index, ds->index);
  58         ds->slave_mii_bus->parent = ds->dev;
  59         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  60 }
  61
  62
  63 /* slave device handling ****************************************************/
  64 static int dsa_slave_get_iflink(const struct net_device *dev)
  65 {
  66         return dsa_slave_to_master(dev)->ifindex;
  67 }
  68
  69 static int dsa_slave_open(struct net_device *dev)
  70 {
  71         struct net_device *master = dsa_slave_to_master(dev);
  72         struct dsa_port *dp = dsa_slave_to_port(dev);
  73         int err;
  74
  75         if (!(master->flags & IFF_UP))
  76                 return -ENETDOWN;
  77
  78         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  79                 err = dev_uc_add(master, dev->dev_addr);
  80                 if (err < 0)
  81                         goto out;
  82         }
  83
  84         if (dev->flags & IFF_ALLMULTI) {
  85                 err = dev_set_allmulti(master, 1);
  86                 if (err < 0)
  87                         goto del_unicast;
  88         }
  89         if (dev->flags & IFF_PROMISC) {
  90                 err = dev_set_promiscuity(master, 1);
  91                 if (err < 0)
  92                         goto clear_allmulti;
  93         }
  94
  95         err = dsa_port_enable(dp, dev->phydev);
  96         if (err)
  97                 goto clear_promisc;
  98
  99         if (dev->phydev)
 100                 phy_start(dev->phydev);
 101
 102         return 0;
 103
 104 clear_promisc:
 105         if (dev->flags & IFF_PROMISC)
 106                 dev_set_promiscuity(master, -1);
 107 clear_allmulti:
 108         if (dev->flags & IFF_ALLMULTI)
 109                 dev_set_allmulti(master, -1);
 110 del_unicast:
 111         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 112                 dev_uc_del(master, dev->dev_addr);
 113 out:
 114         return err;
 115 }
 116
 117 static int dsa_slave_close(struct net_device *dev)
 118 {
 119         struct net_device *master = dsa_slave_to_master(dev);
 120         struct dsa_port *dp = dsa_slave_to_port(dev);
 121
 122         if (dev->phydev)
 123                 phy_stop(dev->phydev);
 124
 125         dsa_port_disable(dp, dev->phydev);
 126
 127         dev_mc_unsync(master, dev);
 128         dev_uc_unsync(master, dev);
 129         if (dev->flags & IFF_ALLMULTI)
 130                 dev_set_allmulti(master, -1);
 131         if (dev->flags & IFF_PROMISC)
 132                 dev_set_promiscuity(master, -1);
 133
 134         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 135                 dev_uc_del(master, dev->dev_addr);
 136
 137         return 0;
 138 }
 139
 140 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 141 {
 142         struct net_device *master = dsa_slave_to_master(dev);
 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 net_device *master = dsa_slave_to_master(dev);
 153
 154         dev_mc_sync(master, dev);
 155         dev_uc_sync(master, dev);
 156 }
 157
 158 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 159 {
 160         struct net_device *master = dsa_slave_to_master(dev);
 161         struct sockaddr *addr = a;
 162         int err;
 163
 164         if (!is_valid_ether_addr(addr->sa_data))
 165                 return -EADDRNOTAVAIL;
 166
 167         if (!(dev->flags & IFF_UP))
 168                 goto out;
 169
 170         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 171                 err = dev_uc_add(master, addr->sa_data);
 172                 if (err < 0)
 173                         return err;
 174         }
 175
 176         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 177                 dev_uc_del(master, dev->dev_addr);
 178
 179 out:
 180         ether_addr_copy(dev->dev_addr, addr->sa_data);
 181
 182         return 0;
 183 }
 184
 185 struct dsa_slave_dump_ctx {
 186         struct net_device *dev;
 187         struct sk_buff *skb;
 188         struct netlink_callback *cb;
 189         int idx;
 190 };
 191
 192 static int
 193 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 194                            bool is_static, void *data)
 195 {
 196         struct dsa_slave_dump_ctx *dump = data;
 197         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 198         u32 seq = dump->cb->nlh->nlmsg_seq;
 199         struct nlmsghdr *nlh;
 200         struct ndmsg *ndm;
 201
 202         if (dump->idx < dump->cb->args[2])
 203                 goto skip;
 204
 205         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 206                         sizeof(*ndm), NLM_F_MULTI);
 207         if (!nlh)
 208                 return -EMSGSIZE;
 209
 210         ndm = nlmsg_data(nlh);
 211         ndm->ndm_family  = AF_BRIDGE;
 212         ndm->ndm_pad1    = 0;
 213         ndm->ndm_pad2    = 0;
 214         ndm->ndm_flags   = NTF_SELF;
 215         ndm->ndm_type    = 0;
 216         ndm->ndm_ifindex = dump->dev->ifindex;
 217         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 218
 219         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 220                 goto nla_put_failure;
 221
 222         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 223                 goto nla_put_failure;
 224
 225         nlmsg_end(dump->skb, nlh);
 226
 227 skip:
 228         dump->idx++;
 229         return 0;
 230
 231 nla_put_failure:
 232         nlmsg_cancel(dump->skb, nlh);
 233         return -EMSGSIZE;
 234 }
 235
 236 static int
 237 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 238                    struct net_device *dev, struct net_device *filter_dev,
 239                    int *idx)
 240 {
 241         struct dsa_port *dp = dsa_slave_to_port(dev);
 242         struct dsa_slave_dump_ctx dump = {
 243                 .dev = dev,
 244                 .skb = skb,
 245                 .cb = cb,
 246                 .idx = *idx,
 247         };
 248         int err;
 249
 250         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 251         *idx = dump.idx;
 252
 253         return err;
 254 }
 255
 256 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 257 {
 258         if (!dev->phydev)
 259                 return -ENODEV;
 260
 261         return phy_mii_ioctl(dev->phydev, ifr, cmd);
 262 }
 263
 264 static int dsa_slave_port_attr_set(struct net_device *dev,
 265                                    const struct switchdev_attr *attr,
 266                                    struct switchdev_trans *trans)
 267 {
 268         struct dsa_port *dp = dsa_slave_to_port(dev);
 269         int ret;
 270
 271         switch (attr->id) {
 272         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 273                 ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
 274                 break;
 275         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 276                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 277                                               trans);
 278                 break;
 279         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 280                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
 281                 break;
 282         default:
 283                 ret = -EOPNOTSUPP;
 284                 break;
 285         }
 286
 287         return ret;
 288 }
 289
 290 static int dsa_slave_port_obj_add(struct net_device *dev,
 291                                   const struct switchdev_obj *obj,
 292                                   struct switchdev_trans *trans)
 293 {
 294         struct dsa_port *dp = dsa_slave_to_port(dev);
 295         int err;
 296
 297         /* For the prepare phase, ensure the full set of changes is feasable in
 298          * one go in order to signal a failure properly. If an operation is not
 299          * supported, return -EOPNOTSUPP.
 300          */
 301
 302         switch (obj->id) {
 303         case SWITCHDEV_OBJ_ID_PORT_MDB:
 304                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 305                 break;
 306         case SWITCHDEV_OBJ_ID_HOST_MDB:
 307                 /* DSA can directly translate this to a normal MDB add,
 308                  * but on the CPU port.
 309                  */
 310                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj),
 311                                        trans);
 312                 break;
 313         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 314                 err = dsa_port_vlan_add(dp, SWITCHDEV_OBJ_PORT_VLAN(obj),
 315                                         trans);
 316                 break;
 317         default:
 318                 err = -EOPNOTSUPP;
 319                 break;
 320         }
 321
 322         return err;
 323 }
 324
 325 static int dsa_slave_port_obj_del(struct net_device *dev,
 326                                   const struct switchdev_obj *obj)
 327 {
 328         struct dsa_port *dp = dsa_slave_to_port(dev);
 329         int err;
 330
 331         switch (obj->id) {
 332         case SWITCHDEV_OBJ_ID_PORT_MDB:
 333                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 334                 break;
 335         case SWITCHDEV_OBJ_ID_HOST_MDB:
 336                 /* DSA can directly translate this to a normal MDB add,
 337                  * but on the CPU port.
 338                  */
 339                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 340                 break;
 341         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 342                 err = dsa_port_vlan_del(dp, SWITCHDEV_OBJ_PORT_VLAN(obj));
 343                 break;
 344         default:
 345                 err = -EOPNOTSUPP;
 346                 break;
 347         }
 348
 349         return err;
 350 }
 351
 352 static int dsa_slave_port_attr_get(struct net_device *dev,
 353                                    struct switchdev_attr *attr)
 354 {
 355         struct dsa_port *dp = dsa_slave_to_port(dev);
 356         struct dsa_switch *ds = dp->ds;
 357         struct dsa_switch_tree *dst = ds->dst;
 358
 359         switch (attr->id) {
 360         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 361                 attr->u.ppid.id_len = sizeof(dst->index);
 362                 memcpy(&attr->u.ppid.id, &dst->index, attr->u.ppid.id_len);
 363                 break;
 364         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT:
 365                 attr->u.brport_flags_support = 0;
 366                 break;
 367         default:
 368                 return -EOPNOTSUPP;
 369         }
 370
 371         return 0;
 372 }
 373
 374 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 375                                                      struct sk_buff *skb)
 376 {
 377 #ifdef CONFIG_NET_POLL_CONTROLLER
 378         struct dsa_slave_priv *p = netdev_priv(dev);
 379
 380         if (p->netpoll)
 381                 netpoll_send_skb(p->netpoll, skb);
 382 #else
 383         BUG();
 384 #endif
 385         return NETDEV_TX_OK;
 386 }
 387
 388 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 389 {
 390         struct dsa_slave_priv *p = netdev_priv(dev);
 391         struct pcpu_sw_netstats *s;
 392         struct sk_buff *nskb;
 393
 394         s = this_cpu_ptr(p->stats64);
 395         u64_stats_update_begin(&s->syncp);
 396         s->tx_packets++;
 397         s->tx_bytes += skb->len;
 398         u64_stats_update_end(&s->syncp);
 399
 400         /* Transmit function may have to reallocate the original SKB,
 401          * in which case it must have freed it. Only free it here on error.
 402          */
 403         nskb = p->xmit(skb, dev);
 404         if (!nskb) {
 405                 kfree_skb(skb);
 406                 return NETDEV_TX_OK;
 407         }
 408
 409         /* SKB for netpoll still need to be mangled with the protocol-specific
 410          * tag to be successfully transmitted
 411          */
 412         if (unlikely(netpoll_tx_running(dev)))
 413                 return dsa_slave_netpoll_send_skb(dev, nskb);
 414
 415         /* Queue the SKB for transmission on the parent interface, but
 416          * do not modify its EtherType
 417          */
 418         nskb->dev = dsa_slave_to_master(dev);
 419         dev_queue_xmit(nskb);
 420
 421         return NETDEV_TX_OK;
 422 }
 423
 424 /* ethtool operations *******************************************************/
 425
 426 static void dsa_slave_get_drvinfo(struct net_device *dev,
 427                                   struct ethtool_drvinfo *drvinfo)
 428 {
 429         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 430         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 431         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 432 }
 433
 434 static int dsa_slave_get_regs_len(struct net_device *dev)
 435 {
 436         struct dsa_port *dp = dsa_slave_to_port(dev);
 437         struct dsa_switch *ds = dp->ds;
 438
 439         if (ds->ops->get_regs_len)
 440                 return ds->ops->get_regs_len(ds, dp->index);
 441
 442         return -EOPNOTSUPP;
 443 }
 444
 445 static void
 446 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 447 {
 448         struct dsa_port *dp = dsa_slave_to_port(dev);
 449         struct dsa_switch *ds = dp->ds;
 450
 451         if (ds->ops->get_regs)
 452                 ds->ops->get_regs(ds, dp->index, regs, _p);
 453 }
 454
 455 static u32 dsa_slave_get_link(struct net_device *dev)
 456 {
 457         if (!dev->phydev)
 458                 return -ENODEV;
 459
 460         genphy_update_link(dev->phydev);
 461
 462         return dev->phydev->link;
 463 }
 464
 465 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 466 {
 467         struct dsa_port *dp = dsa_slave_to_port(dev);
 468         struct dsa_switch *ds = dp->ds;
 469
 470         if (ds->cd && ds->cd->eeprom_len)
 471                 return ds->cd->eeprom_len;
 472
 473         if (ds->ops->get_eeprom_len)
 474                 return ds->ops->get_eeprom_len(ds);
 475
 476         return 0;
 477 }
 478
 479 static int dsa_slave_get_eeprom(struct net_device *dev,
 480                                 struct ethtool_eeprom *eeprom, u8 *data)
 481 {
 482         struct dsa_port *dp = dsa_slave_to_port(dev);
 483         struct dsa_switch *ds = dp->ds;
 484
 485         if (ds->ops->get_eeprom)
 486                 return ds->ops->get_eeprom(ds, eeprom, data);
 487
 488         return -EOPNOTSUPP;
 489 }
 490
 491 static int dsa_slave_set_eeprom(struct net_device *dev,
 492                                 struct ethtool_eeprom *eeprom, u8 *data)
 493 {
 494         struct dsa_port *dp = dsa_slave_to_port(dev);
 495         struct dsa_switch *ds = dp->ds;
 496
 497         if (ds->ops->set_eeprom)
 498                 return ds->ops->set_eeprom(ds, eeprom, data);
 499
 500         return -EOPNOTSUPP;
 501 }
 502
 503 static void dsa_slave_get_strings(struct net_device *dev,
 504                                   uint32_t stringset, uint8_t *data)
 505 {
 506         struct dsa_port *dp = dsa_slave_to_port(dev);
 507         struct dsa_switch *ds = dp->ds;
 508
 509         if (stringset == ETH_SS_STATS) {
 510                 int len = ETH_GSTRING_LEN;
 511
 512                 strncpy(data, "tx_packets", len);
 513                 strncpy(data + len, "tx_bytes", len);
 514                 strncpy(data + 2 * len, "rx_packets", len);
 515                 strncpy(data + 3 * len, "rx_bytes", len);
 516                 if (ds->ops->get_strings)
 517                         ds->ops->get_strings(ds, dp->index, data + 4 * len);
 518         }
 519 }
 520
 521 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 522                                         struct ethtool_stats *stats,
 523                                         uint64_t *data)
 524 {
 525         struct dsa_port *dp = dsa_slave_to_port(dev);
 526         struct dsa_slave_priv *p = netdev_priv(dev);
 527         struct dsa_switch *ds = dp->ds;
 528         struct pcpu_sw_netstats *s;
 529         unsigned int start;
 530         int i;
 531
 532         for_each_possible_cpu(i) {
 533                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 534
 535                 s = per_cpu_ptr(p->stats64, i);
 536                 do {
 537                         start = u64_stats_fetch_begin_irq(&s->syncp);
 538                         tx_packets = s->tx_packets;
 539                         tx_bytes = s->tx_bytes;
 540                         rx_packets = s->rx_packets;
 541                         rx_bytes = s->rx_bytes;
 542                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 543                 data[0] += tx_packets;
 544                 data[1] += tx_bytes;
 545                 data[2] += rx_packets;
 546                 data[3] += rx_bytes;
 547         }
 548         if (ds->ops->get_ethtool_stats)
 549                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 550 }
 551
 552 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 553 {
 554         struct dsa_port *dp = dsa_slave_to_port(dev);
 555         struct dsa_switch *ds = dp->ds;
 556
 557         if (sset == ETH_SS_STATS) {
 558                 int count;
 559
 560                 count = 4;
 561                 if (ds->ops->get_sset_count)
 562                         count += ds->ops->get_sset_count(ds);
 563
 564                 return count;
 565         }
 566
 567         return -EOPNOTSUPP;
 568 }
 569
 570 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 571 {
 572         struct dsa_port *dp = dsa_slave_to_port(dev);
 573         struct dsa_switch *ds = dp->ds;
 574
 575         if (ds->ops->get_wol)
 576                 ds->ops->get_wol(ds, dp->index, w);
 577 }
 578
 579 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 580 {
 581         struct dsa_port *dp = dsa_slave_to_port(dev);
 582         struct dsa_switch *ds = dp->ds;
 583         int ret = -EOPNOTSUPP;
 584
 585         if (ds->ops->set_wol)
 586                 ret = ds->ops->set_wol(ds, dp->index, w);
 587
 588         return ret;
 589 }
 590
 591 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 592 {
 593         struct dsa_port *dp = dsa_slave_to_port(dev);
 594         struct dsa_switch *ds = dp->ds;
 595         int ret;
 596
 597         /* Port's PHY and MAC both need to be EEE capable */
 598         if (!dev->phydev)
 599                 return -ENODEV;
 600
 601         if (!ds->ops->set_mac_eee)
 602                 return -EOPNOTSUPP;
 603
 604         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 605         if (ret)
 606                 return ret;
 607
 608         if (e->eee_enabled) {
 609                 ret = phy_init_eee(dev->phydev, 0);
 610                 if (ret)
 611                         return ret;
 612         }
 613
 614         return phy_ethtool_set_eee(dev->phydev, e);
 615 }
 616
 617 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 618 {
 619         struct dsa_port *dp = dsa_slave_to_port(dev);
 620         struct dsa_switch *ds = dp->ds;
 621         int ret;
 622
 623         /* Port's PHY and MAC both need to be EEE capable */
 624         if (!dev->phydev)
 625                 return -ENODEV;
 626
 627         if (!ds->ops->get_mac_eee)
 628                 return -EOPNOTSUPP;
 629
 630         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 631         if (ret)
 632                 return ret;
 633
 634         return phy_ethtool_get_eee(dev->phydev, e);
 635 }
 636
 637 #ifdef CONFIG_NET_POLL_CONTROLLER
 638 static int dsa_slave_netpoll_setup(struct net_device *dev,
 639                                    struct netpoll_info *ni)
 640 {
 641         struct net_device *master = dsa_slave_to_master(dev);
 642         struct dsa_slave_priv *p = netdev_priv(dev);
 643         struct netpoll *netpoll;
 644         int err = 0;
 645
 646         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 647         if (!netpoll)
 648                 return -ENOMEM;
 649
 650         err = __netpoll_setup(netpoll, master);
 651         if (err) {
 652                 kfree(netpoll);
 653                 goto out;
 654         }
 655
 656         p->netpoll = netpoll;
 657 out:
 658         return err;
 659 }
 660
 661 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 662 {
 663         struct dsa_slave_priv *p = netdev_priv(dev);
 664         struct netpoll *netpoll = p->netpoll;
 665
 666         if (!netpoll)
 667                 return;
 668
 669         p->netpoll = NULL;
 670
 671         __netpoll_free_async(netpoll);
 672 }
 673
 674 static void dsa_slave_poll_controller(struct net_device *dev)
 675 {
 676 }
 677 #endif
 678
 679 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 680                                         char *name, size_t len)
 681 {
 682         struct dsa_port *dp = dsa_slave_to_port(dev);
 683
 684         if (snprintf(name, len, "p%d", dp->index) >= len)
 685                 return -EINVAL;
 686
 687         return 0;
 688 }
 689
 690 static struct dsa_mall_tc_entry *
 691 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 692 {
 693         struct dsa_slave_priv *p = netdev_priv(dev);
 694         struct dsa_mall_tc_entry *mall_tc_entry;
 695
 696         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 697                 if (mall_tc_entry->cookie == cookie)
 698                         return mall_tc_entry;
 699
 700         return NULL;
 701 }
 702
 703 static int dsa_slave_add_cls_matchall(struct net_device *dev,
 704                                       struct tc_cls_matchall_offload *cls,
 705                                       bool ingress)
 706 {
 707         struct dsa_port *dp = dsa_slave_to_port(dev);
 708         struct dsa_slave_priv *p = netdev_priv(dev);
 709         struct dsa_mall_tc_entry *mall_tc_entry;
 710         __be16 protocol = cls->common.protocol;
 711         struct net *net = dev_net(dev);
 712         struct dsa_switch *ds = dp->ds;
 713         struct net_device *to_dev;
 714         const struct tc_action *a;
 715         struct dsa_port *to_dp;
 716         int err = -EOPNOTSUPP;
 717         LIST_HEAD(actions);
 718         int ifindex;
 719
 720         if (!ds->ops->port_mirror_add)
 721                 return err;
 722
 723         if (!tcf_exts_has_one_action(cls->exts))
 724                 return err;
 725
 726         tcf_exts_to_list(cls->exts, &actions);
 727         a = list_first_entry(&actions, struct tc_action, list);
 728
 729         if (is_tcf_mirred_egress_mirror(a) && protocol == htons(ETH_P_ALL)) {
 730                 struct dsa_mall_mirror_tc_entry *mirror;
 731
 732                 ifindex = tcf_mirred_ifindex(a);
 733                 to_dev = __dev_get_by_index(net, ifindex);
 734                 if (!to_dev)
 735                         return -EINVAL;
 736
 737                 if (!dsa_slave_dev_check(to_dev))
 738                         return -EOPNOTSUPP;
 739
 740                 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 741                 if (!mall_tc_entry)
 742                         return -ENOMEM;
 743
 744                 mall_tc_entry->cookie = cls->cookie;
 745                 mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 746                 mirror = &mall_tc_entry->mirror;
 747
 748                 to_dp = dsa_slave_to_port(to_dev);
 749
 750                 mirror->to_local_port = to_dp->index;
 751                 mirror->ingress = ingress;
 752
 753                 err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 754                 if (err) {
 755                         kfree(mall_tc_entry);
 756                         return err;
 757                 }
 758
 759                 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 760         }
 761
 762         return 0;
 763 }
 764
 765 static void dsa_slave_del_cls_matchall(struct net_device *dev,
 766                                        struct tc_cls_matchall_offload *cls)
 767 {
 768         struct dsa_port *dp = dsa_slave_to_port(dev);
 769         struct dsa_mall_tc_entry *mall_tc_entry;
 770         struct dsa_switch *ds = dp->ds;
 771
 772         if (!ds->ops->port_mirror_del)
 773                 return;
 774
 775         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
 776         if (!mall_tc_entry)
 777                 return;
 778
 779         list_del(&mall_tc_entry->list);
 780
 781         switch (mall_tc_entry->type) {
 782         case DSA_PORT_MALL_MIRROR:
 783                 ds->ops->port_mirror_del(ds, dp->index, &mall_tc_entry->mirror);
 784                 break;
 785         default:
 786                 WARN_ON(1);
 787         }
 788
 789         kfree(mall_tc_entry);
 790 }
 791
 792 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
 793                                            struct tc_cls_matchall_offload *cls,
 794                                            bool ingress)
 795 {
 796         if (cls->common.chain_index)
 797                 return -EOPNOTSUPP;
 798
 799         switch (cls->command) {
 800         case TC_CLSMATCHALL_REPLACE:
 801                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
 802         case TC_CLSMATCHALL_DESTROY:
 803                 dsa_slave_del_cls_matchall(dev, cls);
 804                 return 0;
 805         default:
 806                 return -EOPNOTSUPP;
 807         }
 808 }
 809
 810 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
 811                                        void *cb_priv, bool ingress)
 812 {
 813         struct net_device *dev = cb_priv;
 814
 815         if (!tc_can_offload(dev))
 816                 return -EOPNOTSUPP;
 817
 818         switch (type) {
 819         case TC_SETUP_CLSMATCHALL:
 820                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
 821         default:
 822                 return -EOPNOTSUPP;
 823         }
 824 }
 825
 826 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
 827                                           void *type_data, void *cb_priv)
 828 {
 829         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
 830 }
 831
 832 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
 833                                           void *type_data, void *cb_priv)
 834 {
 835         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
 836 }
 837
 838 static int dsa_slave_setup_tc_block(struct net_device *dev,
 839                                     struct tc_block_offload *f)
 840 {
 841         tc_setup_cb_t *cb;
 842
 843         if (f->binder_type == TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 844                 cb = dsa_slave_setup_tc_block_cb_ig;
 845         else if (f->binder_type == TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
 846                 cb = dsa_slave_setup_tc_block_cb_eg;
 847         else
 848                 return -EOPNOTSUPP;
 849
 850         switch (f->command) {
 851         case TC_BLOCK_BIND:
 852                 return tcf_block_cb_register(f->block, cb, dev, dev);
 853         case TC_BLOCK_UNBIND:
 854                 tcf_block_cb_unregister(f->block, cb, dev);
 855                 return 0;
 856         default:
 857                 return -EOPNOTSUPP;
 858         }
 859 }
 860
 861 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
 862                               void *type_data)
 863 {
 864         switch (type) {
 865         case TC_SETUP_BLOCK:
 866                 return dsa_slave_setup_tc_block(dev, type_data);
 867         default:
 868                 return -EOPNOTSUPP;
 869         }
 870 }
 871
 872 static void dsa_slave_get_stats64(struct net_device *dev,
 873                                   struct rtnl_link_stats64 *stats)
 874 {
 875         struct dsa_slave_priv *p = netdev_priv(dev);
 876         struct pcpu_sw_netstats *s;
 877         unsigned int start;
 878         int i;
 879
 880         netdev_stats_to_stats64(stats, &dev->stats);
 881         for_each_possible_cpu(i) {
 882                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 883
 884                 s = per_cpu_ptr(p->stats64, i);
 885                 do {
 886                         start = u64_stats_fetch_begin_irq(&s->syncp);
 887                         tx_packets = s->tx_packets;
 888                         tx_bytes = s->tx_bytes;
 889                         rx_packets = s->rx_packets;
 890                         rx_bytes = s->rx_bytes;
 891                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 892
 893                 stats->tx_packets += tx_packets;
 894                 stats->tx_bytes += tx_bytes;
 895                 stats->rx_packets += rx_packets;
 896                 stats->rx_bytes += rx_bytes;
 897         }
 898 }
 899
 900 static int dsa_slave_get_rxnfc(struct net_device *dev,
 901                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
 902 {
 903         struct dsa_port *dp = dsa_slave_to_port(dev);
 904         struct dsa_switch *ds = dp->ds;
 905
 906         if (!ds->ops->get_rxnfc)
 907                 return -EOPNOTSUPP;
 908
 909         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
 910 }
 911
 912 static int dsa_slave_set_rxnfc(struct net_device *dev,
 913                                struct ethtool_rxnfc *nfc)
 914 {
 915         struct dsa_port *dp = dsa_slave_to_port(dev);
 916         struct dsa_switch *ds = dp->ds;
 917
 918         if (!ds->ops->set_rxnfc)
 919                 return -EOPNOTSUPP;
 920
 921         return ds->ops->set_rxnfc(ds, dp->index, nfc);
 922 }
 923
 924 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 925         .get_drvinfo            = dsa_slave_get_drvinfo,
 926         .get_regs_len           = dsa_slave_get_regs_len,
 927         .get_regs               = dsa_slave_get_regs,
 928         .nway_reset             = phy_ethtool_nway_reset,
 929         .get_link               = dsa_slave_get_link,
 930         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 931         .get_eeprom             = dsa_slave_get_eeprom,
 932         .set_eeprom             = dsa_slave_set_eeprom,
 933         .get_strings            = dsa_slave_get_strings,
 934         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 935         .get_sset_count         = dsa_slave_get_sset_count,
 936         .set_wol                = dsa_slave_set_wol,
 937         .get_wol                = dsa_slave_get_wol,
 938         .set_eee                = dsa_slave_set_eee,
 939         .get_eee                = dsa_slave_get_eee,
 940         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 941         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 942         .get_rxnfc              = dsa_slave_get_rxnfc,
 943         .set_rxnfc              = dsa_slave_set_rxnfc,
 944 };
 945
 946 static const struct net_device_ops dsa_slave_netdev_ops = {
 947         .ndo_open               = dsa_slave_open,
 948         .ndo_stop               = dsa_slave_close,
 949         .ndo_start_xmit         = dsa_slave_xmit,
 950         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 951         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 952         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 953         .ndo_fdb_add            = dsa_legacy_fdb_add,
 954         .ndo_fdb_del            = dsa_legacy_fdb_del,
 955         .ndo_fdb_dump           = dsa_slave_fdb_dump,
 956         .ndo_do_ioctl           = dsa_slave_ioctl,
 957         .ndo_get_iflink         = dsa_slave_get_iflink,
 958 #ifdef CONFIG_NET_POLL_CONTROLLER
 959         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 960         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 961         .ndo_poll_controller    = dsa_slave_poll_controller,
 962 #endif
 963         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
 964         .ndo_setup_tc           = dsa_slave_setup_tc,
 965         .ndo_get_stats64        = dsa_slave_get_stats64,
 966 };
 967
 968 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 969         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 970         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 971         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 972         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 973 };
 974
 975 static struct device_type dsa_type = {
 976         .name   = "dsa",
 977 };
 978
 979 static void dsa_slave_adjust_link(struct net_device *dev)
 980 {
 981         struct dsa_port *dp = dsa_slave_to_port(dev);
 982         struct dsa_slave_priv *p = netdev_priv(dev);
 983         struct dsa_switch *ds = dp->ds;
 984         unsigned int status_changed = 0;
 985
 986         if (p->old_link != dev->phydev->link) {
 987                 status_changed = 1;
 988                 p->old_link = dev->phydev->link;
 989         }
 990
 991         if (p->old_duplex != dev->phydev->duplex) {
 992                 status_changed = 1;
 993                 p->old_duplex = dev->phydev->duplex;
 994         }
 995
 996         if (p->old_pause != dev->phydev->pause) {
 997                 status_changed = 1;
 998                 p->old_pause = dev->phydev->pause;
 999         }
1000
1001         if (ds->ops->adjust_link && status_changed)
1002                 ds->ops->adjust_link(ds, dp->index, dev->phydev);
1003
1004         if (status_changed)
1005                 phy_print_status(dev->phydev);
1006 }
1007
1008 static int dsa_slave_fixed_link_update(struct net_device *dev,
1009                                        struct fixed_phy_status *status)
1010 {
1011         struct dsa_switch *ds;
1012         struct dsa_port *dp;
1013
1014         if (dev) {
1015                 dp = dsa_slave_to_port(dev);
1016                 ds = dp->ds;
1017                 if (ds->ops->fixed_link_update)
1018                         ds->ops->fixed_link_update(ds, dp->index, status);
1019         }
1020
1021         return 0;
1022 }
1023
1024 /* slave device setup *******************************************************/
1025 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1026 {
1027         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1028         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1029         struct dsa_switch *ds = dp->ds;
1030
1031         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1032         if (!slave_dev->phydev) {
1033                 netdev_err(slave_dev, "no phy at %d\n", addr);
1034                 return -ENODEV;
1035         }
1036
1037         /* Use already configured phy mode */
1038         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1039                 p->phy_interface = slave_dev->phydev->interface;
1040
1041         return phy_connect_direct(slave_dev, slave_dev->phydev,
1042                                   dsa_slave_adjust_link, p->phy_interface);
1043 }
1044
1045 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1046 {
1047         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1048         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1049         struct device_node *port_dn = dp->dn;
1050         struct dsa_switch *ds = dp->ds;
1051         struct device_node *phy_dn;
1052         bool phy_is_fixed = false;
1053         u32 phy_flags = 0;
1054         int mode, ret;
1055
1056         mode = of_get_phy_mode(port_dn);
1057         if (mode < 0)
1058                 mode = PHY_INTERFACE_MODE_NA;
1059         p->phy_interface = mode;
1060
1061         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1062         if (!phy_dn && of_phy_is_fixed_link(port_dn)) {
1063                 /* In the case of a fixed PHY, the DT node associated
1064                  * to the fixed PHY is the Port DT node
1065                  */
1066                 ret = of_phy_register_fixed_link(port_dn);
1067                 if (ret) {
1068                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1069                         return ret;
1070                 }
1071                 phy_is_fixed = true;
1072                 phy_dn = of_node_get(port_dn);
1073         }
1074
1075         if (ds->ops->get_phy_flags)
1076                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1077
1078         if (phy_dn) {
1079                 slave_dev->phydev = of_phy_connect(slave_dev, phy_dn,
1080                                                    dsa_slave_adjust_link,
1081                                                    phy_flags,
1082                                                    p->phy_interface);
1083                 of_node_put(phy_dn);
1084         }
1085
1086         if (slave_dev->phydev && phy_is_fixed)
1087                 fixed_phy_set_link_update(slave_dev->phydev,
1088                                           dsa_slave_fixed_link_update);
1089
1090         /* We could not connect to a designated PHY, so use the switch internal
1091          * MDIO bus instead
1092          */
1093         if (!slave_dev->phydev) {
1094                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1095                 if (ret) {
1096                         netdev_err(slave_dev, "failed to connect to port %d: %d\n",
1097                                    dp->index, ret);
1098                         if (phy_is_fixed)
1099                                 of_phy_deregister_fixed_link(port_dn);
1100                         return ret;
1101                 }
1102         }
1103
1104         phy_attached_info(slave_dev->phydev);
1105
1106         return 0;
1107 }
1108
1109 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1110 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1111                                             struct netdev_queue *txq,
1112                                             void *_unused)
1113 {
1114         lockdep_set_class(&txq->_xmit_lock,
1115                           &dsa_slave_netdev_xmit_lock_key);
1116 }
1117
1118 int dsa_slave_suspend(struct net_device *slave_dev)
1119 {
1120         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1121
1122         netif_device_detach(slave_dev);
1123
1124         if (slave_dev->phydev) {
1125                 phy_stop(slave_dev->phydev);
1126                 p->old_pause = -1;
1127                 p->old_link = -1;
1128                 p->old_duplex = -1;
1129                 phy_suspend(slave_dev->phydev);
1130         }
1131
1132         return 0;
1133 }
1134
1135 int dsa_slave_resume(struct net_device *slave_dev)
1136 {
1137         netif_device_attach(slave_dev);
1138
1139         if (slave_dev->phydev) {
1140                 phy_resume(slave_dev->phydev);
1141                 phy_start(slave_dev->phydev);
1142         }
1143
1144         return 0;
1145 }
1146
1147 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1148 {
1149         struct net_device *master = dsa_slave_to_master(dev);
1150         struct dsa_port *dp = dsa_slave_to_port(dev);
1151         struct dsa_notifier_register_info rinfo = {
1152                 .switch_number = dp->ds->index,
1153                 .port_number = dp->index,
1154                 .master = master,
1155                 .info.dev = dev,
1156         };
1157
1158         call_dsa_notifiers(val, dev, &rinfo.info);
1159 }
1160
1161 int dsa_slave_create(struct dsa_port *port)
1162 {
1163         const struct dsa_port *cpu_dp = port->cpu_dp;
1164         struct net_device *master = cpu_dp->master;
1165         struct dsa_switch *ds = port->ds;
1166         const char *name = port->name;
1167         struct net_device *slave_dev;
1168         struct dsa_slave_priv *p;
1169         int ret;
1170
1171         if (!ds->num_tx_queues)
1172                 ds->num_tx_queues = 1;
1173
1174         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1175                                      NET_NAME_UNKNOWN, ether_setup,
1176                                      ds->num_tx_queues, 1);
1177         if (slave_dev == NULL)
1178                 return -ENOMEM;
1179
1180         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1181         slave_dev->hw_features |= NETIF_F_HW_TC;
1182         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1183         eth_hw_addr_inherit(slave_dev, master);
1184         slave_dev->priv_flags |= IFF_NO_QUEUE;
1185         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1186         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1187         slave_dev->min_mtu = 0;
1188         slave_dev->max_mtu = ETH_MAX_MTU;
1189         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1190
1191         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1192                                  NULL);
1193
1194         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1195         slave_dev->dev.of_node = port->dn;
1196         slave_dev->vlan_features = master->vlan_features;
1197
1198         p = netdev_priv(slave_dev);
1199         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1200         if (!p->stats64) {
1201                 free_netdev(slave_dev);
1202                 return -ENOMEM;
1203         }
1204         p->dp = port;
1205         INIT_LIST_HEAD(&p->mall_tc_list);
1206         p->xmit = cpu_dp->tag_ops->xmit;
1207
1208         p->old_pause = -1;
1209         p->old_link = -1;
1210         p->old_duplex = -1;
1211
1212         port->slave = slave_dev;
1213
1214         netif_carrier_off(slave_dev);
1215
1216         ret = dsa_slave_phy_setup(slave_dev);
1217         if (ret) {
1218                 netdev_err(master, "error %d setting up slave phy\n", ret);
1219                 goto out_free;
1220         }
1221
1222         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1223
1224         ret = register_netdev(slave_dev);
1225         if (ret) {
1226                 netdev_err(master, "error %d registering interface %s\n",
1227                            ret, slave_dev->name);
1228                 goto out_phy;
1229         }
1230
1231         return 0;
1232
1233 out_phy:
1234         phy_disconnect(slave_dev->phydev);
1235         if (of_phy_is_fixed_link(port->dn))
1236                 of_phy_deregister_fixed_link(port->dn);
1237 out_free:
1238         free_percpu(p->stats64);
1239         free_netdev(slave_dev);
1240         port->slave = NULL;
1241         return ret;
1242 }
1243
1244 void dsa_slave_destroy(struct net_device *slave_dev)
1245 {
1246         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1247         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1248         struct device_node *port_dn = dp->dn;
1249
1250         netif_carrier_off(slave_dev);
1251         if (slave_dev->phydev) {
1252                 phy_disconnect(slave_dev->phydev);
1253
1254                 if (of_phy_is_fixed_link(port_dn))
1255                         of_phy_deregister_fixed_link(port_dn);
1256         }
1257         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1258         unregister_netdev(slave_dev);
1259         free_percpu(p->stats64);
1260         free_netdev(slave_dev);
1261 }
1262
1263 static bool dsa_slave_dev_check(struct net_device *dev)
1264 {
1265         return dev->netdev_ops == &dsa_slave_netdev_ops;
1266 }
1267
1268 static int dsa_slave_changeupper(struct net_device *dev,
1269                                  struct netdev_notifier_changeupper_info *info)
1270 {
1271         struct dsa_port *dp = dsa_slave_to_port(dev);
1272         int err = NOTIFY_DONE;
1273
1274         if (netif_is_bridge_master(info->upper_dev)) {
1275                 if (info->linking) {
1276                         err = dsa_port_bridge_join(dp, info->upper_dev);
1277                         err = notifier_from_errno(err);
1278                 } else {
1279                         dsa_port_bridge_leave(dp, info->upper_dev);
1280                         err = NOTIFY_OK;
1281                 }
1282         }
1283
1284         return err;
1285 }
1286
1287 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1288                                      unsigned long event, void *ptr)
1289 {
1290         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1291
1292         if (!dsa_slave_dev_check(dev))
1293                 return NOTIFY_DONE;
1294
1295         if (event == NETDEV_CHANGEUPPER)
1296                 return dsa_slave_changeupper(dev, ptr);
1297
1298         return NOTIFY_DONE;
1299 }
1300
1301 struct dsa_switchdev_event_work {
1302         struct work_struct work;
1303         struct switchdev_notifier_fdb_info fdb_info;
1304         struct net_device *dev;
1305         unsigned long event;
1306 };
1307
1308 static void dsa_slave_switchdev_event_work(struct work_struct *work)
1309 {
1310         struct dsa_switchdev_event_work *switchdev_work =
1311                 container_of(work, struct dsa_switchdev_event_work, work);
1312         struct net_device *dev = switchdev_work->dev;
1313         struct switchdev_notifier_fdb_info *fdb_info;
1314         struct dsa_port *dp = dsa_slave_to_port(dev);
1315         int err;
1316
1317         rtnl_lock();
1318         switch (switchdev_work->event) {
1319         case SWITCHDEV_FDB_ADD_TO_DEVICE:
1320                 fdb_info = &switchdev_work->fdb_info;
1321                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
1322                 if (err) {
1323                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
1324                         break;
1325                 }
1326                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
1327                                          &fdb_info->info);
1328                 break;
1329
1330         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1331                 fdb_info = &switchdev_work->fdb_info;
1332                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
1333                 if (err) {
1334                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
1335                         dev_close(dev);
1336                 }
1337                 break;
1338         }
1339         rtnl_unlock();
1340
1341         kfree(switchdev_work->fdb_info.addr);
1342         kfree(switchdev_work);
1343         dev_put(dev);
1344 }
1345
1346 static int
1347 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
1348                                   switchdev_work,
1349                                   const struct switchdev_notifier_fdb_info *
1350                                   fdb_info)
1351 {
1352         memcpy(&switchdev_work->fdb_info, fdb_info,
1353                sizeof(switchdev_work->fdb_info));
1354         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
1355         if (!switchdev_work->fdb_info.addr)
1356                 return -ENOMEM;
1357         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
1358                         fdb_info->addr);
1359         return 0;
1360 }
1361
1362 /* Called under rcu_read_lock() */
1363 static int dsa_slave_switchdev_event(struct notifier_block *unused,
1364                                      unsigned long event, void *ptr)
1365 {
1366         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1367         struct dsa_switchdev_event_work *switchdev_work;
1368
1369         if (!dsa_slave_dev_check(dev))
1370                 return NOTIFY_DONE;
1371
1372         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
1373         if (!switchdev_work)
1374                 return NOTIFY_BAD;
1375
1376         INIT_WORK(&switchdev_work->work,
1377                   dsa_slave_switchdev_event_work);
1378         switchdev_work->dev = dev;
1379         switchdev_work->event = event;
1380
1381         switch (event) {
1382         case SWITCHDEV_FDB_ADD_TO_DEVICE: /* fall through */
1383         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1384                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work,
1385                                                       ptr))
1386                         goto err_fdb_work_init;
1387                 dev_hold(dev);
1388                 break;
1389         default:
1390                 kfree(switchdev_work);
1391                 return NOTIFY_DONE;
1392         }
1393
1394         dsa_schedule_work(&switchdev_work->work);
1395         return NOTIFY_OK;
1396
1397 err_fdb_work_init:
1398         kfree(switchdev_work);
1399         return NOTIFY_BAD;
1400 }
1401
1402 static struct notifier_block dsa_slave_nb __read_mostly = {
1403         .notifier_call  = dsa_slave_netdevice_event,
1404 };
1405
1406 static struct notifier_block dsa_slave_switchdev_notifier = {
1407         .notifier_call = dsa_slave_switchdev_event,
1408 };
1409
1410 int dsa_slave_register_notifier(void)
1411 {
1412         int err;
1413
1414         err = register_netdevice_notifier(&dsa_slave_nb);
1415         if (err)
1416                 return err;
1417
1418         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
1419         if (err)
1420                 goto err_switchdev_nb;
1421
1422         return 0;
1423
1424 err_switchdev_nb:
1425         unregister_netdevice_notifier(&dsa_slave_nb);
1426         return err;
1427 }
1428
1429 void dsa_slave_unregister_notifier(void)
1430 {
1431         int err;
1432
1433         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
1434         if (err)
1435                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
1436
1437         err = unregister_netdevice_notifier(&dsa_slave_nb);
1438         if (err)
1439                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
1440 }