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->index, 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         return dsa_slave_to_master(dev)->ifindex;
  68 }
  69
  70 static int dsa_slave_open(struct net_device *dev)
  71 {
  72         struct net_device *master = dsa_slave_to_master(dev);
  73         struct dsa_port *dp = dsa_slave_to_port(dev);
  74         int err;
  75
  76         if (!(master->flags & IFF_UP))
  77                 return -ENETDOWN;
  78
  79         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  80                 err = dev_uc_add(master, dev->dev_addr);
  81                 if (err < 0)
  82                         goto out;
  83         }
  84
  85         if (dev->flags & IFF_ALLMULTI) {
  86                 err = dev_set_allmulti(master, 1);
  87                 if (err < 0)
  88                         goto del_unicast;
  89         }
  90         if (dev->flags & IFF_PROMISC) {
  91                 err = dev_set_promiscuity(master, 1);
  92                 if (err < 0)
  93                         goto clear_allmulti;
  94         }
  95
  96         err = dsa_port_enable(dp, dev->phydev);
  97         if (err)
  98                 goto clear_promisc;
  99
 100         if (dev->phydev)
 101                 phy_start(dev->phydev);
 102
 103         return 0;
 104
 105 clear_promisc:
 106         if (dev->flags & IFF_PROMISC)
 107                 dev_set_promiscuity(master, -1);
 108 clear_allmulti:
 109         if (dev->flags & IFF_ALLMULTI)
 110                 dev_set_allmulti(master, -1);
 111 del_unicast:
 112         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 113                 dev_uc_del(master, dev->dev_addr);
 114 out:
 115         return err;
 116 }
 117
 118 static int dsa_slave_close(struct net_device *dev)
 119 {
 120         struct net_device *master = dsa_slave_to_master(dev);
 121         struct dsa_port *dp = dsa_slave_to_port(dev);
 122
 123         if (dev->phydev)
 124                 phy_stop(dev->phydev);
 125
 126         dsa_port_disable(dp, dev->phydev);
 127
 128         dev_mc_unsync(master, dev);
 129         dev_uc_unsync(master, dev);
 130         if (dev->flags & IFF_ALLMULTI)
 131                 dev_set_allmulti(master, -1);
 132         if (dev->flags & IFF_PROMISC)
 133                 dev_set_promiscuity(master, -1);
 134
 135         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 136                 dev_uc_del(master, dev->dev_addr);
 137
 138         return 0;
 139 }
 140
 141 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 142 {
 143         struct net_device *master = dsa_slave_to_master(dev);
 144
 145         if (change & IFF_ALLMULTI)
 146                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 147         if (change & IFF_PROMISC)
 148                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 149 }
 150
 151 static void dsa_slave_set_rx_mode(struct net_device *dev)
 152 {
 153         struct net_device *master = dsa_slave_to_master(dev);
 154
 155         dev_mc_sync(master, dev);
 156         dev_uc_sync(master, dev);
 157 }
 158
 159 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 160 {
 161         struct net_device *master = dsa_slave_to_master(dev);
 162         struct sockaddr *addr = a;
 163         int err;
 164
 165         if (!is_valid_ether_addr(addr->sa_data))
 166                 return -EADDRNOTAVAIL;
 167
 168         if (!(dev->flags & IFF_UP))
 169                 goto out;
 170
 171         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 172                 err = dev_uc_add(master, addr->sa_data);
 173                 if (err < 0)
 174                         return err;
 175         }
 176
 177         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 178                 dev_uc_del(master, dev->dev_addr);
 179
 180 out:
 181         ether_addr_copy(dev->dev_addr, addr->sa_data);
 182
 183         return 0;
 184 }
 185
 186 struct dsa_slave_dump_ctx {
 187         struct net_device *dev;
 188         struct sk_buff *skb;
 189         struct netlink_callback *cb;
 190         int idx;
 191 };
 192
 193 static int
 194 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 195                            bool is_static, void *data)
 196 {
 197         struct dsa_slave_dump_ctx *dump = data;
 198         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 199         u32 seq = dump->cb->nlh->nlmsg_seq;
 200         struct nlmsghdr *nlh;
 201         struct ndmsg *ndm;
 202
 203         if (dump->idx < dump->cb->args[2])
 204                 goto skip;
 205
 206         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 207                         sizeof(*ndm), NLM_F_MULTI);
 208         if (!nlh)
 209                 return -EMSGSIZE;
 210
 211         ndm = nlmsg_data(nlh);
 212         ndm->ndm_family  = AF_BRIDGE;
 213         ndm->ndm_pad1    = 0;
 214         ndm->ndm_pad2    = 0;
 215         ndm->ndm_flags   = NTF_SELF;
 216         ndm->ndm_type    = 0;
 217         ndm->ndm_ifindex = dump->dev->ifindex;
 218         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 219
 220         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 221                 goto nla_put_failure;
 222
 223         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 224                 goto nla_put_failure;
 225
 226         nlmsg_end(dump->skb, nlh);
 227
 228 skip:
 229         dump->idx++;
 230         return 0;
 231
 232 nla_put_failure:
 233         nlmsg_cancel(dump->skb, nlh);
 234         return -EMSGSIZE;
 235 }
 236
 237 static int
 238 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 239                    struct net_device *dev, struct net_device *filter_dev,
 240                    int *idx)
 241 {
 242         struct dsa_port *dp = dsa_slave_to_port(dev);
 243         struct dsa_slave_dump_ctx dump = {
 244                 .dev = dev,
 245                 .skb = skb,
 246                 .cb = cb,
 247                 .idx = *idx,
 248         };
 249         int err;
 250
 251         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 252         *idx = dump.idx;
 253
 254         return err;
 255 }
 256
 257 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 258 {
 259         if (!dev->phydev)
 260                 return -ENODEV;
 261
 262         return phy_mii_ioctl(dev->phydev, ifr, cmd);
 263 }
 264
 265 static int dsa_slave_port_attr_set(struct net_device *dev,
 266                                    const struct switchdev_attr *attr,
 267                                    struct switchdev_trans *trans)
 268 {
 269         struct dsa_port *dp = dsa_slave_to_port(dev);
 270         int ret;
 271
 272         switch (attr->id) {
 273         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 274                 ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
 275                 break;
 276         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 277                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 278                                               trans);
 279                 break;
 280         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 281                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
 282                 break;
 283         default:
 284                 ret = -EOPNOTSUPP;
 285                 break;
 286         }
 287
 288         return ret;
 289 }
 290
 291 static int dsa_slave_port_obj_add(struct net_device *dev,
 292                                   const struct switchdev_obj *obj,
 293                                   struct switchdev_trans *trans)
 294 {
 295         struct dsa_port *dp = dsa_slave_to_port(dev);
 296         int err;
 297
 298         /* For the prepare phase, ensure the full set of changes is feasable in
 299          * one go in order to signal a failure properly. If an operation is not
 300          * supported, return -EOPNOTSUPP.
 301          */
 302
 303         switch (obj->id) {
 304         case SWITCHDEV_OBJ_ID_PORT_MDB:
 305                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 306                 break;
 307         case SWITCHDEV_OBJ_ID_HOST_MDB:
 308                 /* DSA can directly translate this to a normal MDB add,
 309                  * but on the CPU port.
 310                  */
 311                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj),
 312                                        trans);
 313                 break;
 314         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 315                 err = dsa_port_vlan_add(dp, SWITCHDEV_OBJ_PORT_VLAN(obj),
 316                                         trans);
 317                 break;
 318         default:
 319                 err = -EOPNOTSUPP;
 320                 break;
 321         }
 322
 323         return err;
 324 }
 325
 326 static int dsa_slave_port_obj_del(struct net_device *dev,
 327                                   const struct switchdev_obj *obj)
 328 {
 329         struct dsa_port *dp = dsa_slave_to_port(dev);
 330         int err;
 331
 332         switch (obj->id) {
 333         case SWITCHDEV_OBJ_ID_PORT_MDB:
 334                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 335                 break;
 336         case SWITCHDEV_OBJ_ID_HOST_MDB:
 337                 /* DSA can directly translate this to a normal MDB add,
 338                  * but on the CPU port.
 339                  */
 340                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 341                 break;
 342         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 343                 err = dsa_port_vlan_del(dp, SWITCHDEV_OBJ_PORT_VLAN(obj));
 344                 break;
 345         default:
 346                 err = -EOPNOTSUPP;
 347                 break;
 348         }
 349
 350         return err;
 351 }
 352
 353 static int dsa_slave_port_attr_get(struct net_device *dev,
 354                                    struct switchdev_attr *attr)
 355 {
 356         struct dsa_port *dp = dsa_slave_to_port(dev);
 357         struct dsa_switch *ds = dp->ds;
 358         struct dsa_switch_tree *dst = ds->dst;
 359
 360         switch (attr->id) {
 361         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 362                 attr->u.ppid.id_len = sizeof(dst->index);
 363                 memcpy(&attr->u.ppid.id, &dst->index, attr->u.ppid.id_len);
 364                 break;
 365         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT:
 366                 attr->u.brport_flags_support = 0;
 367                 break;
 368         default:
 369                 return -EOPNOTSUPP;
 370         }
 371
 372         return 0;
 373 }
 374
 375 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 376                                                      struct sk_buff *skb)
 377 {
 378 #ifdef CONFIG_NET_POLL_CONTROLLER
 379         struct dsa_slave_priv *p = netdev_priv(dev);
 380
 381         if (p->netpoll)
 382                 netpoll_send_skb(p->netpoll, skb);
 383 #else
 384         BUG();
 385 #endif
 386         return NETDEV_TX_OK;
 387 }
 388
 389 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 390 {
 391         struct dsa_slave_priv *p = netdev_priv(dev);
 392         struct pcpu_sw_netstats *s;
 393         struct sk_buff *nskb;
 394
 395         s = this_cpu_ptr(p->stats64);
 396         u64_stats_update_begin(&s->syncp);
 397         s->tx_packets++;
 398         s->tx_bytes += skb->len;
 399         u64_stats_update_end(&s->syncp);
 400
 401         /* Transmit function may have to reallocate the original SKB,
 402          * in which case it must have freed it. Only free it here on error.
 403          */
 404         nskb = p->xmit(skb, dev);
 405         if (!nskb) {
 406                 kfree_skb(skb);
 407                 return NETDEV_TX_OK;
 408         }
 409
 410         /* SKB for netpoll still need to be mangled with the protocol-specific
 411          * tag to be successfully transmitted
 412          */
 413         if (unlikely(netpoll_tx_running(dev)))
 414                 return dsa_slave_netpoll_send_skb(dev, nskb);
 415
 416         /* Queue the SKB for transmission on the parent interface, but
 417          * do not modify its EtherType
 418          */
 419         nskb->dev = dsa_slave_to_master(dev);
 420         dev_queue_xmit(nskb);
 421
 422         return NETDEV_TX_OK;
 423 }
 424
 425 /* ethtool operations *******************************************************/
 426
 427 static void dsa_slave_get_drvinfo(struct net_device *dev,
 428                                   struct ethtool_drvinfo *drvinfo)
 429 {
 430         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 431         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 432         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 433 }
 434
 435 static int dsa_slave_get_regs_len(struct net_device *dev)
 436 {
 437         struct dsa_port *dp = dsa_slave_to_port(dev);
 438         struct dsa_switch *ds = dp->ds;
 439
 440         if (ds->ops->get_regs_len)
 441                 return ds->ops->get_regs_len(ds, dp->index);
 442
 443         return -EOPNOTSUPP;
 444 }
 445
 446 static void
 447 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 448 {
 449         struct dsa_port *dp = dsa_slave_to_port(dev);
 450         struct dsa_switch *ds = dp->ds;
 451
 452         if (ds->ops->get_regs)
 453                 ds->ops->get_regs(ds, dp->index, regs, _p);
 454 }
 455
 456 static u32 dsa_slave_get_link(struct net_device *dev)
 457 {
 458         if (!dev->phydev)
 459                 return -ENODEV;
 460
 461         genphy_update_link(dev->phydev);
 462
 463         return dev->phydev->link;
 464 }
 465
 466 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 467 {
 468         struct dsa_port *dp = dsa_slave_to_port(dev);
 469         struct dsa_switch *ds = 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_port *dp = dsa_slave_to_port(dev);
 484         struct dsa_switch *ds = 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_port *dp = dsa_slave_to_port(dev);
 496         struct dsa_switch *ds = 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_port *dp = dsa_slave_to_port(dev);
 508         struct dsa_switch *ds = 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, dp->index, data + 4 * len);
 519         }
 520 }
 521
 522 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 523                                         struct ethtool_stats *stats,
 524                                         uint64_t *data)
 525 {
 526         struct dsa_port *dp = dsa_slave_to_port(dev);
 527         struct dsa_slave_priv *p = netdev_priv(dev);
 528         struct dsa_switch *ds = dp->ds;
 529         struct pcpu_sw_netstats *s;
 530         unsigned int start;
 531         int i;
 532
 533         for_each_possible_cpu(i) {
 534                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 535
 536                 s = per_cpu_ptr(p->stats64, i);
 537                 do {
 538                         start = u64_stats_fetch_begin_irq(&s->syncp);
 539                         tx_packets = s->tx_packets;
 540                         tx_bytes = s->tx_bytes;
 541                         rx_packets = s->rx_packets;
 542                         rx_bytes = s->rx_bytes;
 543                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 544                 data[0] += tx_packets;
 545                 data[1] += tx_bytes;
 546                 data[2] += rx_packets;
 547                 data[3] += rx_bytes;
 548         }
 549         if (ds->ops->get_ethtool_stats)
 550                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 551 }
 552
 553 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 554 {
 555         struct dsa_port *dp = dsa_slave_to_port(dev);
 556         struct dsa_switch *ds = dp->ds;
 557
 558         if (sset == ETH_SS_STATS) {
 559                 int count;
 560
 561                 count = 4;
 562                 if (ds->ops->get_sset_count)
 563                         count += ds->ops->get_sset_count(ds);
 564
 565                 return count;
 566         }
 567
 568         return -EOPNOTSUPP;
 569 }
 570
 571 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 572 {
 573         struct dsa_port *dp = dsa_slave_to_port(dev);
 574         struct dsa_switch *ds = dp->ds;
 575
 576         if (ds->ops->get_wol)
 577                 ds->ops->get_wol(ds, dp->index, w);
 578 }
 579
 580 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 581 {
 582         struct dsa_port *dp = dsa_slave_to_port(dev);
 583         struct dsa_switch *ds = dp->ds;
 584         int ret = -EOPNOTSUPP;
 585
 586         if (ds->ops->set_wol)
 587                 ret = ds->ops->set_wol(ds, dp->index, w);
 588
 589         return ret;
 590 }
 591
 592 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 593 {
 594         struct dsa_port *dp = dsa_slave_to_port(dev);
 595         struct dsa_switch *ds = dp->ds;
 596         int ret;
 597
 598         /* Port's PHY and MAC both need to be EEE capable */
 599         if (!dev->phydev)
 600                 return -ENODEV;
 601
 602         if (!ds->ops->set_mac_eee)
 603                 return -EOPNOTSUPP;
 604
 605         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 606         if (ret)
 607                 return ret;
 608
 609         if (e->eee_enabled) {
 610                 ret = phy_init_eee(dev->phydev, 0);
 611                 if (ret)
 612                         return ret;
 613         }
 614
 615         return phy_ethtool_set_eee(dev->phydev, e);
 616 }
 617
 618 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 619 {
 620         struct dsa_port *dp = dsa_slave_to_port(dev);
 621         struct dsa_switch *ds = dp->ds;
 622         int ret;
 623
 624         /* Port's PHY and MAC both need to be EEE capable */
 625         if (!dev->phydev)
 626                 return -ENODEV;
 627
 628         if (!ds->ops->get_mac_eee)
 629                 return -EOPNOTSUPP;
 630
 631         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 632         if (ret)
 633                 return ret;
 634
 635         return phy_ethtool_get_eee(dev->phydev, e);
 636 }
 637
 638 #ifdef CONFIG_NET_POLL_CONTROLLER
 639 static int dsa_slave_netpoll_setup(struct net_device *dev,
 640                                    struct netpoll_info *ni)
 641 {
 642         struct net_device *master = dsa_slave_to_master(dev);
 643         struct dsa_slave_priv *p = netdev_priv(dev);
 644         struct netpoll *netpoll;
 645         int err = 0;
 646
 647         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 648         if (!netpoll)
 649                 return -ENOMEM;
 650
 651         err = __netpoll_setup(netpoll, master);
 652         if (err) {
 653                 kfree(netpoll);
 654                 goto out;
 655         }
 656
 657         p->netpoll = netpoll;
 658 out:
 659         return err;
 660 }
 661
 662 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 663 {
 664         struct dsa_slave_priv *p = netdev_priv(dev);
 665         struct netpoll *netpoll = p->netpoll;
 666
 667         if (!netpoll)
 668                 return;
 669
 670         p->netpoll = NULL;
 671
 672         __netpoll_free_async(netpoll);
 673 }
 674
 675 static void dsa_slave_poll_controller(struct net_device *dev)
 676 {
 677 }
 678 #endif
 679
 680 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 681                                         char *name, size_t len)
 682 {
 683         struct dsa_port *dp = dsa_slave_to_port(dev);
 684
 685         if (snprintf(name, len, "p%d", dp->index) >= len)
 686                 return -EINVAL;
 687
 688         return 0;
 689 }
 690
 691 static struct dsa_mall_tc_entry *
 692 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 693 {
 694         struct dsa_slave_priv *p = netdev_priv(dev);
 695         struct dsa_mall_tc_entry *mall_tc_entry;
 696
 697         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 698                 if (mall_tc_entry->cookie == cookie)
 699                         return mall_tc_entry;
 700
 701         return NULL;
 702 }
 703
 704 static int dsa_slave_add_cls_matchall(struct net_device *dev,
 705                                       struct tc_cls_matchall_offload *cls,
 706                                       bool ingress)
 707 {
 708         struct dsa_port *dp = dsa_slave_to_port(dev);
 709         struct dsa_slave_priv *p = netdev_priv(dev);
 710         struct dsa_mall_tc_entry *mall_tc_entry;
 711         __be16 protocol = cls->common.protocol;
 712         struct net *net = dev_net(dev);
 713         struct dsa_switch *ds = dp->ds;
 714         struct net_device *to_dev;
 715         const struct tc_action *a;
 716         struct dsa_port *to_dp;
 717         int err = -EOPNOTSUPP;
 718         LIST_HEAD(actions);
 719         int ifindex;
 720
 721         if (!ds->ops->port_mirror_add)
 722                 return err;
 723
 724         if (!tcf_exts_has_one_action(cls->exts))
 725                 return err;
 726
 727         tcf_exts_to_list(cls->exts, &actions);
 728         a = list_first_entry(&actions, struct tc_action, list);
 729
 730         if (is_tcf_mirred_egress_mirror(a) && protocol == htons(ETH_P_ALL)) {
 731                 struct dsa_mall_mirror_tc_entry *mirror;
 732
 733                 ifindex = tcf_mirred_ifindex(a);
 734                 to_dev = __dev_get_by_index(net, ifindex);
 735                 if (!to_dev)
 736                         return -EINVAL;
 737
 738                 if (!dsa_slave_dev_check(to_dev))
 739                         return -EOPNOTSUPP;
 740
 741                 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 742                 if (!mall_tc_entry)
 743                         return -ENOMEM;
 744
 745                 mall_tc_entry->cookie = cls->cookie;
 746                 mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 747                 mirror = &mall_tc_entry->mirror;
 748
 749                 to_dp = dsa_slave_to_port(to_dev);
 750
 751                 mirror->to_local_port = to_dp->index;
 752                 mirror->ingress = ingress;
 753
 754                 err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 755                 if (err) {
 756                         kfree(mall_tc_entry);
 757                         return err;
 758                 }
 759
 760                 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 761         }
 762
 763         return 0;
 764 }
 765
 766 static void dsa_slave_del_cls_matchall(struct net_device *dev,
 767                                        struct tc_cls_matchall_offload *cls)
 768 {
 769         struct dsa_port *dp = dsa_slave_to_port(dev);
 770         struct dsa_mall_tc_entry *mall_tc_entry;
 771         struct dsa_switch *ds = dp->ds;
 772
 773         if (!ds->ops->port_mirror_del)
 774                 return;
 775
 776         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
 777         if (!mall_tc_entry)
 778                 return;
 779
 780         list_del(&mall_tc_entry->list);
 781
 782         switch (mall_tc_entry->type) {
 783         case DSA_PORT_MALL_MIRROR:
 784                 ds->ops->port_mirror_del(ds, dp->index, &mall_tc_entry->mirror);
 785                 break;
 786         default:
 787                 WARN_ON(1);
 788         }
 789
 790         kfree(mall_tc_entry);
 791 }
 792
 793 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
 794                                            struct tc_cls_matchall_offload *cls,
 795                                            bool ingress)
 796 {
 797         if (cls->common.chain_index)
 798                 return -EOPNOTSUPP;
 799
 800         switch (cls->command) {
 801         case TC_CLSMATCHALL_REPLACE:
 802                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
 803         case TC_CLSMATCHALL_DESTROY:
 804                 dsa_slave_del_cls_matchall(dev, cls);
 805                 return 0;
 806         default:
 807                 return -EOPNOTSUPP;
 808         }
 809 }
 810
 811 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
 812                                        void *cb_priv, bool ingress)
 813 {
 814         struct net_device *dev = cb_priv;
 815
 816         if (!tc_can_offload(dev))
 817                 return -EOPNOTSUPP;
 818
 819         switch (type) {
 820         case TC_SETUP_CLSMATCHALL:
 821                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
 822         default:
 823                 return -EOPNOTSUPP;
 824         }
 825 }
 826
 827 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
 828                                           void *type_data, void *cb_priv)
 829 {
 830         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
 831 }
 832
 833 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
 834                                           void *type_data, void *cb_priv)
 835 {
 836         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
 837 }
 838
 839 static int dsa_slave_setup_tc_block(struct net_device *dev,
 840                                     struct tc_block_offload *f)
 841 {
 842         tc_setup_cb_t *cb;
 843
 844         if (f->binder_type == TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 845                 cb = dsa_slave_setup_tc_block_cb_ig;
 846         else if (f->binder_type == TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
 847                 cb = dsa_slave_setup_tc_block_cb_eg;
 848         else
 849                 return -EOPNOTSUPP;
 850
 851         switch (f->command) {
 852         case TC_BLOCK_BIND:
 853                 return tcf_block_cb_register(f->block, cb, dev, dev);
 854         case TC_BLOCK_UNBIND:
 855                 tcf_block_cb_unregister(f->block, cb, dev);
 856                 return 0;
 857         default:
 858                 return -EOPNOTSUPP;
 859         }
 860 }
 861
 862 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
 863                               void *type_data)
 864 {
 865         switch (type) {
 866         case TC_SETUP_BLOCK:
 867                 return dsa_slave_setup_tc_block(dev, type_data);
 868         default:
 869                 return -EOPNOTSUPP;
 870         }
 871 }
 872
 873 static void dsa_slave_get_stats64(struct net_device *dev,
 874                                   struct rtnl_link_stats64 *stats)
 875 {
 876         struct dsa_slave_priv *p = netdev_priv(dev);
 877         struct pcpu_sw_netstats *s;
 878         unsigned int start;
 879         int i;
 880
 881         netdev_stats_to_stats64(stats, &dev->stats);
 882         for_each_possible_cpu(i) {
 883                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 884
 885                 s = per_cpu_ptr(p->stats64, i);
 886                 do {
 887                         start = u64_stats_fetch_begin_irq(&s->syncp);
 888                         tx_packets = s->tx_packets;
 889                         tx_bytes = s->tx_bytes;
 890                         rx_packets = s->rx_packets;
 891                         rx_bytes = s->rx_bytes;
 892                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 893
 894                 stats->tx_packets += tx_packets;
 895                 stats->tx_bytes += tx_bytes;
 896                 stats->rx_packets += rx_packets;
 897                 stats->rx_bytes += rx_bytes;
 898         }
 899 }
 900
 901 static int dsa_slave_get_rxnfc(struct net_device *dev,
 902                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
 903 {
 904         struct dsa_port *dp = dsa_slave_to_port(dev);
 905         struct dsa_switch *ds = dp->ds;
 906
 907         if (!ds->ops->get_rxnfc)
 908                 return -EOPNOTSUPP;
 909
 910         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
 911 }
 912
 913 static int dsa_slave_set_rxnfc(struct net_device *dev,
 914                                struct ethtool_rxnfc *nfc)
 915 {
 916         struct dsa_port *dp = dsa_slave_to_port(dev);
 917         struct dsa_switch *ds = dp->ds;
 918
 919         if (!ds->ops->set_rxnfc)
 920                 return -EOPNOTSUPP;
 921
 922         return ds->ops->set_rxnfc(ds, dp->index, nfc);
 923 }
 924
 925 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 926         .get_drvinfo            = dsa_slave_get_drvinfo,
 927         .get_regs_len           = dsa_slave_get_regs_len,
 928         .get_regs               = dsa_slave_get_regs,
 929         .nway_reset             = phy_ethtool_nway_reset,
 930         .get_link               = dsa_slave_get_link,
 931         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 932         .get_eeprom             = dsa_slave_get_eeprom,
 933         .set_eeprom             = dsa_slave_set_eeprom,
 934         .get_strings            = dsa_slave_get_strings,
 935         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 936         .get_sset_count         = dsa_slave_get_sset_count,
 937         .set_wol                = dsa_slave_set_wol,
 938         .get_wol                = dsa_slave_get_wol,
 939         .set_eee                = dsa_slave_set_eee,
 940         .get_eee                = dsa_slave_get_eee,
 941         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 942         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 943         .get_rxnfc              = dsa_slave_get_rxnfc,
 944         .set_rxnfc              = dsa_slave_set_rxnfc,
 945 };
 946
 947 static const struct net_device_ops dsa_slave_netdev_ops = {
 948         .ndo_open               = dsa_slave_open,
 949         .ndo_stop               = dsa_slave_close,
 950         .ndo_start_xmit         = dsa_slave_xmit,
 951         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 952         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 953         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 954         .ndo_fdb_add            = dsa_legacy_fdb_add,
 955         .ndo_fdb_del            = dsa_legacy_fdb_del,
 956         .ndo_fdb_dump           = dsa_slave_fdb_dump,
 957         .ndo_do_ioctl           = dsa_slave_ioctl,
 958         .ndo_get_iflink         = dsa_slave_get_iflink,
 959 #ifdef CONFIG_NET_POLL_CONTROLLER
 960         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 961         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 962         .ndo_poll_controller    = dsa_slave_poll_controller,
 963 #endif
 964         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
 965         .ndo_setup_tc           = dsa_slave_setup_tc,
 966         .ndo_get_stats64        = dsa_slave_get_stats64,
 967 };
 968
 969 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 970         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 971         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 972         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 973         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 974 };
 975
 976 static struct device_type dsa_type = {
 977         .name   = "dsa",
 978 };
 979
 980 static void dsa_slave_adjust_link(struct net_device *dev)
 981 {
 982         struct dsa_port *dp = dsa_slave_to_port(dev);
 983         struct dsa_slave_priv *p = netdev_priv(dev);
 984         struct dsa_switch *ds = dp->ds;
 985         unsigned int status_changed = 0;
 986
 987         if (p->old_link != dev->phydev->link) {
 988                 status_changed = 1;
 989                 p->old_link = dev->phydev->link;
 990         }
 991
 992         if (p->old_duplex != dev->phydev->duplex) {
 993                 status_changed = 1;
 994                 p->old_duplex = dev->phydev->duplex;
 995         }
 996
 997         if (p->old_pause != dev->phydev->pause) {
 998                 status_changed = 1;
 999                 p->old_pause = dev->phydev->pause;
1000         }
1001
1002         if (ds->ops->adjust_link && status_changed)
1003                 ds->ops->adjust_link(ds, dp->index, dev->phydev);
1004
1005         if (status_changed)
1006                 phy_print_status(dev->phydev);
1007 }
1008
1009 static int dsa_slave_fixed_link_update(struct net_device *dev,
1010                                        struct fixed_phy_status *status)
1011 {
1012         struct dsa_switch *ds;
1013         struct dsa_port *dp;
1014
1015         if (dev) {
1016                 dp = dsa_slave_to_port(dev);
1017                 ds = dp->ds;
1018                 if (ds->ops->fixed_link_update)
1019                         ds->ops->fixed_link_update(ds, dp->index, status);
1020         }
1021
1022         return 0;
1023 }
1024
1025 /* slave device setup *******************************************************/
1026 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1027 {
1028         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1029         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1030         struct dsa_switch *ds = dp->ds;
1031
1032         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1033         if (!slave_dev->phydev) {
1034                 netdev_err(slave_dev, "no phy at %d\n", addr);
1035                 return -ENODEV;
1036         }
1037
1038         /* Use already configured phy mode */
1039         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1040                 p->phy_interface = slave_dev->phydev->interface;
1041
1042         return phy_connect_direct(slave_dev, slave_dev->phydev,
1043                                   dsa_slave_adjust_link, p->phy_interface);
1044 }
1045
1046 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1047 {
1048         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1049         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1050         struct device_node *port_dn = dp->dn;
1051         struct dsa_switch *ds = dp->ds;
1052         struct device_node *phy_dn;
1053         bool phy_is_fixed = false;
1054         u32 phy_flags = 0;
1055         int mode, ret;
1056
1057         mode = of_get_phy_mode(port_dn);
1058         if (mode < 0)
1059                 mode = PHY_INTERFACE_MODE_NA;
1060         p->phy_interface = mode;
1061
1062         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1063         if (!phy_dn && of_phy_is_fixed_link(port_dn)) {
1064                 /* In the case of a fixed PHY, the DT node associated
1065                  * to the fixed PHY is the Port DT node
1066                  */
1067                 ret = of_phy_register_fixed_link(port_dn);
1068                 if (ret) {
1069                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1070                         return ret;
1071                 }
1072                 phy_is_fixed = true;
1073                 phy_dn = of_node_get(port_dn);
1074         }
1075
1076         if (ds->ops->get_phy_flags)
1077                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1078
1079         if (phy_dn) {
1080                 slave_dev->phydev = of_phy_connect(slave_dev, phy_dn,
1081                                                    dsa_slave_adjust_link,
1082                                                    phy_flags,
1083                                                    p->phy_interface);
1084                 of_node_put(phy_dn);
1085         }
1086
1087         if (slave_dev->phydev && phy_is_fixed)
1088                 fixed_phy_set_link_update(slave_dev->phydev,
1089                                           dsa_slave_fixed_link_update);
1090
1091         /* We could not connect to a designated PHY, so use the switch internal
1092          * MDIO bus instead
1093          */
1094         if (!slave_dev->phydev) {
1095                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1096                 if (ret) {
1097                         netdev_err(slave_dev, "failed to connect to port %d: %d\n",
1098                                    dp->index, ret);
1099                         if (phy_is_fixed)
1100                                 of_phy_deregister_fixed_link(port_dn);
1101                         return ret;
1102                 }
1103         }
1104
1105         phy_attached_info(slave_dev->phydev);
1106
1107         return 0;
1108 }
1109
1110 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1111 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1112                                             struct netdev_queue *txq,
1113                                             void *_unused)
1114 {
1115         lockdep_set_class(&txq->_xmit_lock,
1116                           &dsa_slave_netdev_xmit_lock_key);
1117 }
1118
1119 int dsa_slave_suspend(struct net_device *slave_dev)
1120 {
1121         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1122
1123         netif_device_detach(slave_dev);
1124
1125         if (slave_dev->phydev) {
1126                 phy_stop(slave_dev->phydev);
1127                 p->old_pause = -1;
1128                 p->old_link = -1;
1129                 p->old_duplex = -1;
1130                 phy_suspend(slave_dev->phydev);
1131         }
1132
1133         return 0;
1134 }
1135
1136 int dsa_slave_resume(struct net_device *slave_dev)
1137 {
1138         netif_device_attach(slave_dev);
1139
1140         if (slave_dev->phydev) {
1141                 phy_resume(slave_dev->phydev);
1142                 phy_start(slave_dev->phydev);
1143         }
1144
1145         return 0;
1146 }
1147
1148 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1149 {
1150         struct net_device *master = dsa_slave_to_master(dev);
1151         struct dsa_port *dp = dsa_slave_to_port(dev);
1152         struct dsa_notifier_register_info rinfo = {
1153                 .switch_number = dp->ds->index,
1154                 .port_number = dp->index,
1155                 .master = master,
1156                 .info.dev = dev,
1157         };
1158
1159         call_dsa_notifiers(val, dev, &rinfo.info);
1160 }
1161
1162 int dsa_slave_create(struct dsa_port *port)
1163 {
1164         const struct dsa_port *cpu_dp = port->cpu_dp;
1165         struct net_device *master = cpu_dp->master;
1166         struct dsa_switch *ds = port->ds;
1167         const char *name = port->name;
1168         struct net_device *slave_dev;
1169         struct dsa_slave_priv *p;
1170         int ret;
1171
1172         if (!ds->num_tx_queues)
1173                 ds->num_tx_queues = 1;
1174
1175         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1176                                      NET_NAME_UNKNOWN, ether_setup,
1177                                      ds->num_tx_queues, 1);
1178         if (slave_dev == NULL)
1179                 return -ENOMEM;
1180
1181         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1182         slave_dev->hw_features |= NETIF_F_HW_TC;
1183         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1184         eth_hw_addr_inherit(slave_dev, master);
1185         slave_dev->priv_flags |= IFF_NO_QUEUE;
1186         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1187         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1188         slave_dev->min_mtu = 0;
1189         slave_dev->max_mtu = ETH_MAX_MTU;
1190         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1191
1192         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1193                                  NULL);
1194
1195         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1196         slave_dev->dev.of_node = port->dn;
1197         slave_dev->vlan_features = master->vlan_features;
1198
1199         p = netdev_priv(slave_dev);
1200         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1201         if (!p->stats64) {
1202                 free_netdev(slave_dev);
1203                 return -ENOMEM;
1204         }
1205         p->dp = port;
1206         INIT_LIST_HEAD(&p->mall_tc_list);
1207         p->xmit = cpu_dp->tag_ops->xmit;
1208
1209         p->old_pause = -1;
1210         p->old_link = -1;
1211         p->old_duplex = -1;
1212
1213         port->slave = slave_dev;
1214
1215         netif_carrier_off(slave_dev);
1216
1217         ret = dsa_slave_phy_setup(slave_dev);
1218         if (ret) {
1219                 netdev_err(master, "error %d setting up slave phy\n", ret);
1220                 goto out_free;
1221         }
1222
1223         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1224
1225         ret = register_netdev(slave_dev);
1226         if (ret) {
1227                 netdev_err(master, "error %d registering interface %s\n",
1228                            ret, slave_dev->name);
1229                 goto out_phy;
1230         }
1231
1232         return 0;
1233
1234 out_phy:
1235         phy_disconnect(slave_dev->phydev);
1236         if (of_phy_is_fixed_link(port->dn))
1237                 of_phy_deregister_fixed_link(port->dn);
1238 out_free:
1239         free_percpu(p->stats64);
1240         free_netdev(slave_dev);
1241         port->slave = NULL;
1242         return ret;
1243 }
1244
1245 void dsa_slave_destroy(struct net_device *slave_dev)
1246 {
1247         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1248         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1249         struct device_node *port_dn = dp->dn;
1250
1251         netif_carrier_off(slave_dev);
1252         if (slave_dev->phydev) {
1253                 phy_disconnect(slave_dev->phydev);
1254
1255                 if (of_phy_is_fixed_link(port_dn))
1256                         of_phy_deregister_fixed_link(port_dn);
1257         }
1258         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1259         unregister_netdev(slave_dev);
1260         free_percpu(p->stats64);
1261         free_netdev(slave_dev);
1262 }
1263
1264 static bool dsa_slave_dev_check(struct net_device *dev)
1265 {
1266         return dev->netdev_ops == &dsa_slave_netdev_ops;
1267 }
1268
1269 static int dsa_slave_changeupper(struct net_device *dev,
1270                                  struct netdev_notifier_changeupper_info *info)
1271 {
1272         struct dsa_port *dp = dsa_slave_to_port(dev);
1273         int err = NOTIFY_DONE;
1274
1275         if (netif_is_bridge_master(info->upper_dev)) {
1276                 if (info->linking) {
1277                         err = dsa_port_bridge_join(dp, info->upper_dev);
1278                         err = notifier_from_errno(err);
1279                 } else {
1280                         dsa_port_bridge_leave(dp, info->upper_dev);
1281                         err = NOTIFY_OK;
1282                 }
1283         }
1284
1285         return err;
1286 }
1287
1288 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1289                                      unsigned long event, void *ptr)
1290 {
1291         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1292
1293         if (!dsa_slave_dev_check(dev))
1294                 return NOTIFY_DONE;
1295
1296         if (event == NETDEV_CHANGEUPPER)
1297                 return dsa_slave_changeupper(dev, ptr);
1298
1299         return NOTIFY_DONE;
1300 }
1301
1302 struct dsa_switchdev_event_work {
1303         struct work_struct work;
1304         struct switchdev_notifier_fdb_info fdb_info;
1305         struct net_device *dev;
1306         unsigned long event;
1307 };
1308
1309 static void dsa_slave_switchdev_event_work(struct work_struct *work)
1310 {
1311         struct dsa_switchdev_event_work *switchdev_work =
1312                 container_of(work, struct dsa_switchdev_event_work, work);
1313         struct net_device *dev = switchdev_work->dev;
1314         struct switchdev_notifier_fdb_info *fdb_info;
1315         struct dsa_port *dp = dsa_slave_to_port(dev);
1316         int err;
1317
1318         rtnl_lock();
1319         switch (switchdev_work->event) {
1320         case SWITCHDEV_FDB_ADD_TO_DEVICE:
1321                 fdb_info = &switchdev_work->fdb_info;
1322                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
1323                 if (err) {
1324                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
1325                         break;
1326                 }
1327                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
1328                                          &fdb_info->info);
1329                 break;
1330
1331         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1332                 fdb_info = &switchdev_work->fdb_info;
1333                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
1334                 if (err) {
1335                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
1336                         dev_close(dev);
1337                 }
1338                 break;
1339         }
1340         rtnl_unlock();
1341
1342         kfree(switchdev_work->fdb_info.addr);
1343         kfree(switchdev_work);
1344         dev_put(dev);
1345 }
1346
1347 static int
1348 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
1349                                   switchdev_work,
1350                                   const struct switchdev_notifier_fdb_info *
1351                                   fdb_info)
1352 {
1353         memcpy(&switchdev_work->fdb_info, fdb_info,
1354                sizeof(switchdev_work->fdb_info));
1355         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
1356         if (!switchdev_work->fdb_info.addr)
1357                 return -ENOMEM;
1358         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
1359                         fdb_info->addr);
1360         return 0;
1361 }
1362
1363 /* Called under rcu_read_lock() */
1364 static int dsa_slave_switchdev_event(struct notifier_block *unused,
1365                                      unsigned long event, void *ptr)
1366 {
1367         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1368         struct dsa_switchdev_event_work *switchdev_work;
1369
1370         if (!dsa_slave_dev_check(dev))
1371                 return NOTIFY_DONE;
1372
1373         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
1374         if (!switchdev_work)
1375                 return NOTIFY_BAD;
1376
1377         INIT_WORK(&switchdev_work->work,
1378                   dsa_slave_switchdev_event_work);
1379         switchdev_work->dev = dev;
1380         switchdev_work->event = event;
1381
1382         switch (event) {
1383         case SWITCHDEV_FDB_ADD_TO_DEVICE: /* fall through */
1384         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1385                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work,
1386                                                       ptr))
1387                         goto err_fdb_work_init;
1388                 dev_hold(dev);
1389                 break;
1390         default:
1391                 kfree(switchdev_work);
1392                 return NOTIFY_DONE;
1393         }
1394
1395         dsa_schedule_work(&switchdev_work->work);
1396         return NOTIFY_OK;
1397
1398 err_fdb_work_init:
1399         kfree(switchdev_work);
1400         return NOTIFY_BAD;
1401 }
1402
1403 static struct notifier_block dsa_slave_nb __read_mostly = {
1404         .notifier_call  = dsa_slave_netdevice_event,
1405 };
1406
1407 static struct notifier_block dsa_slave_switchdev_notifier = {
1408         .notifier_call = dsa_slave_switchdev_event,
1409 };
1410
1411 int dsa_slave_register_notifier(void)
1412 {
1413         int err;
1414
1415         err = register_netdevice_notifier(&dsa_slave_nb);
1416         if (err)
1417                 return err;
1418
1419         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
1420         if (err)
1421                 goto err_switchdev_nb;
1422
1423         return 0;
1424
1425 err_switchdev_nb:
1426         unregister_netdevice_notifier(&dsa_slave_nb);
1427         return err;
1428 }
1429
1430 void dsa_slave_unregister_notifier(void)
1431 {
1432         int err;
1433
1434         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
1435         if (err)
1436                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
1437
1438         err = unregister_netdevice_notifier(&dsa_slave_nb);
1439         if (err)
1440                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
1441 }