net/dsa/slave.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/dsa/slave.c - Slave device handling
   4  * Copyright (c) 2008-2009 Marvell Semiconductor
   5  */
   6
   7 #include <linux/list.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/phy.h>
  11 #include <linux/phy_fixed.h>
  12 #include <linux/phylink.h>
  13 #include <linux/of_net.h>
  14 #include <linux/of_mdio.h>
  15 #include <linux/mdio.h>
  16 #include <net/rtnetlink.h>
  17 #include <net/pkt_cls.h>
  18 #include <net/tc_act/tc_mirred.h>
  19 #include <linux/if_bridge.h>
  20 #include <linux/netpoll.h>
  21 #include <linux/ptp_classify.h>
  22
  23 #include "dsa_priv.h"
  24
  25 /* slave mii_bus handling ***************************************************/
  26 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  27 {
  28         struct dsa_switch *ds = bus->priv;
  29
  30         if (ds->phys_mii_mask & (1 << addr))
  31                 return ds->ops->phy_read(ds, addr, reg);
  32
  33         return 0xffff;
  34 }
  35
  36 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  37 {
  38         struct dsa_switch *ds = bus->priv;
  39
  40         if (ds->phys_mii_mask & (1 << addr))
  41                 return ds->ops->phy_write(ds, addr, reg, val);
  42
  43         return 0;
  44 }
  45
  46 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  47 {
  48         ds->slave_mii_bus->priv = (void *)ds;
  49         ds->slave_mii_bus->name = "dsa slave smi";
  50         ds->slave_mii_bus->read = dsa_slave_phy_read;
  51         ds->slave_mii_bus->write = dsa_slave_phy_write;
  52         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  53                  ds->dst->index, ds->index);
  54         ds->slave_mii_bus->parent = ds->dev;
  55         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  56 }
  57
  58
  59 /* slave device handling ****************************************************/
  60 static int dsa_slave_get_iflink(const struct net_device *dev)
  61 {
  62         return dsa_slave_to_master(dev)->ifindex;
  63 }
  64
  65 static int dsa_slave_open(struct net_device *dev)
  66 {
  67         struct net_device *master = dsa_slave_to_master(dev);
  68         struct dsa_port *dp = dsa_slave_to_port(dev);
  69         int err;
  70
  71         if (!(master->flags & IFF_UP))
  72                 return -ENETDOWN;
  73
  74         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  75                 err = dev_uc_add(master, dev->dev_addr);
  76                 if (err < 0)
  77                         goto out;
  78         }
  79
  80         if (dev->flags & IFF_ALLMULTI) {
  81                 err = dev_set_allmulti(master, 1);
  82                 if (err < 0)
  83                         goto del_unicast;
  84         }
  85         if (dev->flags & IFF_PROMISC) {
  86                 err = dev_set_promiscuity(master, 1);
  87                 if (err < 0)
  88                         goto clear_allmulti;
  89         }
  90
  91         err = dsa_port_enable_rt(dp, dev->phydev);
  92         if (err)
  93                 goto clear_promisc;
  94
  95         return 0;
  96
  97 clear_promisc:
  98         if (dev->flags & IFF_PROMISC)
  99                 dev_set_promiscuity(master, -1);
 100 clear_allmulti:
 101         if (dev->flags & IFF_ALLMULTI)
 102                 dev_set_allmulti(master, -1);
 103 del_unicast:
 104         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 105                 dev_uc_del(master, dev->dev_addr);
 106 out:
 107         return err;
 108 }
 109
 110 static int dsa_slave_close(struct net_device *dev)
 111 {
 112         struct net_device *master = dsa_slave_to_master(dev);
 113         struct dsa_port *dp = dsa_slave_to_port(dev);
 114
 115         dsa_port_disable_rt(dp);
 116
 117         dev_mc_unsync(master, dev);
 118         dev_uc_unsync(master, dev);
 119         if (dev->flags & IFF_ALLMULTI)
 120                 dev_set_allmulti(master, -1);
 121         if (dev->flags & IFF_PROMISC)
 122                 dev_set_promiscuity(master, -1);
 123
 124         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 125                 dev_uc_del(master, dev->dev_addr);
 126
 127         return 0;
 128 }
 129
 130 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 131 {
 132         struct net_device *master = dsa_slave_to_master(dev);
 133         if (dev->flags & IFF_UP) {
 134                 if (change & IFF_ALLMULTI)
 135                         dev_set_allmulti(master,
 136                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 137                 if (change & IFF_PROMISC)
 138                         dev_set_promiscuity(master,
 139                                             dev->flags & IFF_PROMISC ? 1 : -1);
 140         }
 141 }
 142
 143 static void dsa_slave_set_rx_mode(struct net_device *dev)
 144 {
 145         struct net_device *master = dsa_slave_to_master(dev);
 146
 147         dev_mc_sync(master, dev);
 148         dev_uc_sync(master, dev);
 149 }
 150
 151 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 152 {
 153         struct net_device *master = dsa_slave_to_master(dev);
 154         struct sockaddr *addr = a;
 155         int err;
 156
 157         if (!is_valid_ether_addr(addr->sa_data))
 158                 return -EADDRNOTAVAIL;
 159
 160         if (!(dev->flags & IFF_UP))
 161                 goto out;
 162
 163         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 164                 err = dev_uc_add(master, addr->sa_data);
 165                 if (err < 0)
 166                         return err;
 167         }
 168
 169         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 170                 dev_uc_del(master, dev->dev_addr);
 171
 172 out:
 173         ether_addr_copy(dev->dev_addr, addr->sa_data);
 174
 175         return 0;
 176 }
 177
 178 struct dsa_slave_dump_ctx {
 179         struct net_device *dev;
 180         struct sk_buff *skb;
 181         struct netlink_callback *cb;
 182         int idx;
 183 };
 184
 185 static int
 186 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 187                            bool is_static, void *data)
 188 {
 189         struct dsa_slave_dump_ctx *dump = data;
 190         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 191         u32 seq = dump->cb->nlh->nlmsg_seq;
 192         struct nlmsghdr *nlh;
 193         struct ndmsg *ndm;
 194
 195         if (dump->idx < dump->cb->args[2])
 196                 goto skip;
 197
 198         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 199                         sizeof(*ndm), NLM_F_MULTI);
 200         if (!nlh)
 201                 return -EMSGSIZE;
 202
 203         ndm = nlmsg_data(nlh);
 204         ndm->ndm_family  = AF_BRIDGE;
 205         ndm->ndm_pad1    = 0;
 206         ndm->ndm_pad2    = 0;
 207         ndm->ndm_flags   = NTF_SELF;
 208         ndm->ndm_type    = 0;
 209         ndm->ndm_ifindex = dump->dev->ifindex;
 210         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 211
 212         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 213                 goto nla_put_failure;
 214
 215         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 216                 goto nla_put_failure;
 217
 218         nlmsg_end(dump->skb, nlh);
 219
 220 skip:
 221         dump->idx++;
 222         return 0;
 223
 224 nla_put_failure:
 225         nlmsg_cancel(dump->skb, nlh);
 226         return -EMSGSIZE;
 227 }
 228
 229 static int
 230 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 231                    struct net_device *dev, struct net_device *filter_dev,
 232                    int *idx)
 233 {
 234         struct dsa_port *dp = dsa_slave_to_port(dev);
 235         struct dsa_slave_dump_ctx dump = {
 236                 .dev = dev,
 237                 .skb = skb,
 238                 .cb = cb,
 239                 .idx = *idx,
 240         };
 241         int err;
 242
 243         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 244         *idx = dump.idx;
 245
 246         return err;
 247 }
 248
 249 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 250 {
 251         struct dsa_slave_priv *p = netdev_priv(dev);
 252         struct dsa_switch *ds = p->dp->ds;
 253         int port = p->dp->index;
 254
 255         /* Pass through to switch driver if it supports timestamping */
 256         switch (cmd) {
 257         case SIOCGHWTSTAMP:
 258                 if (ds->ops->port_hwtstamp_get)
 259                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 260                 break;
 261         case SIOCSHWTSTAMP:
 262                 if (ds->ops->port_hwtstamp_set)
 263                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 264                 break;
 265         }
 266
 267         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 268 }
 269
 270 static int dsa_slave_port_attr_set(struct net_device *dev,
 271                                    const struct switchdev_attr *attr,
 272                                    struct switchdev_trans *trans)
 273 {
 274         struct dsa_port *dp = dsa_slave_to_port(dev);
 275         int ret;
 276
 277         switch (attr->id) {
 278         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 279                 ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
 280                 break;
 281         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 282                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 283                                               trans);
 284                 break;
 285         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 286                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
 287                 break;
 288         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 289                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 290                                                 trans);
 291                 break;
 292         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 293                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans);
 294                 break;
 295         case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 296                 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, trans);
 297                 break;
 298         default:
 299                 ret = -EOPNOTSUPP;
 300                 break;
 301         }
 302
 303         return ret;
 304 }
 305
 306 static int dsa_slave_vlan_add(struct net_device *dev,
 307                               const struct switchdev_obj *obj,
 308                               struct switchdev_trans *trans)
 309 {
 310         struct dsa_port *dp = dsa_slave_to_port(dev);
 311         struct switchdev_obj_port_vlan vlan;
 312         int err;
 313
 314         if (obj->orig_dev != dev)
 315                 return -EOPNOTSUPP;
 316
 317         if (dp->bridge_dev && !br_vlan_enabled(dp->bridge_dev))
 318                 return 0;
 319
 320         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 321
 322         err = dsa_port_vlan_add(dp, &vlan, trans);
 323         if (err)
 324                 return err;
 325
 326         /* We need the dedicated CPU port to be a member of the VLAN as well.
 327          * Even though drivers often handle CPU membership in special ways,
 328          * it doesn't make sense to program a PVID, so clear this flag.
 329          */
 330         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 331
 332         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, trans);
 333         if (err)
 334                 return err;
 335
 336         return 0;
 337 }
 338
 339 static int dsa_slave_port_obj_add(struct net_device *dev,
 340                                   const struct switchdev_obj *obj,
 341                                   struct switchdev_trans *trans,
 342                                   struct netlink_ext_ack *extack)
 343 {
 344         struct dsa_port *dp = dsa_slave_to_port(dev);
 345         int err;
 346
 347         /* For the prepare phase, ensure the full set of changes is feasable in
 348          * one go in order to signal a failure properly. If an operation is not
 349          * supported, return -EOPNOTSUPP.
 350          */
 351
 352         switch (obj->id) {
 353         case SWITCHDEV_OBJ_ID_PORT_MDB:
 354                 if (obj->orig_dev != dev)
 355                         return -EOPNOTSUPP;
 356                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 357                 break;
 358         case SWITCHDEV_OBJ_ID_HOST_MDB:
 359                 /* DSA can directly translate this to a normal MDB add,
 360                  * but on the CPU port.
 361                  */
 362                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj),
 363                                        trans);
 364                 break;
 365         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 366                 err = dsa_slave_vlan_add(dev, obj, trans);
 367                 break;
 368         default:
 369                 err = -EOPNOTSUPP;
 370                 break;
 371         }
 372
 373         return err;
 374 }
 375
 376 static int dsa_slave_vlan_del(struct net_device *dev,
 377                               const struct switchdev_obj *obj)
 378 {
 379         struct dsa_port *dp = dsa_slave_to_port(dev);
 380
 381         if (obj->orig_dev != dev)
 382                 return -EOPNOTSUPP;
 383
 384         if (dp->bridge_dev && !br_vlan_enabled(dp->bridge_dev))
 385                 return 0;
 386
 387         /* Do not deprogram the CPU port as it may be shared with other user
 388          * ports which can be members of this VLAN as well.
 389          */
 390         return dsa_port_vlan_del(dp, SWITCHDEV_OBJ_PORT_VLAN(obj));
 391 }
 392
 393 static int dsa_slave_port_obj_del(struct net_device *dev,
 394                                   const struct switchdev_obj *obj)
 395 {
 396         struct dsa_port *dp = dsa_slave_to_port(dev);
 397         int err;
 398
 399         switch (obj->id) {
 400         case SWITCHDEV_OBJ_ID_PORT_MDB:
 401                 if (obj->orig_dev != dev)
 402                         return -EOPNOTSUPP;
 403                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 404                 break;
 405         case SWITCHDEV_OBJ_ID_HOST_MDB:
 406                 /* DSA can directly translate this to a normal MDB add,
 407                  * but on the CPU port.
 408                  */
 409                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 410                 break;
 411         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 412                 err = dsa_slave_vlan_del(dev, obj);
 413                 break;
 414         default:
 415                 err = -EOPNOTSUPP;
 416                 break;
 417         }
 418
 419         return err;
 420 }
 421
 422 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 423                                         struct netdev_phys_item_id *ppid)
 424 {
 425         struct dsa_port *dp = dsa_slave_to_port(dev);
 426         struct dsa_switch *ds = dp->ds;
 427         struct dsa_switch_tree *dst = ds->dst;
 428
 429         /* For non-legacy ports, devlink is used and it takes
 430          * care of the name generation. This ndo implementation
 431          * should be removed with legacy support.
 432          */
 433         if (dp->ds->devlink)
 434                 return -EOPNOTSUPP;
 435
 436         ppid->id_len = sizeof(dst->index);
 437         memcpy(&ppid->id, &dst->index, ppid->id_len);
 438
 439         return 0;
 440 }
 441
 442 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 443                                                      struct sk_buff *skb)
 444 {
 445 #ifdef CONFIG_NET_POLL_CONTROLLER
 446         struct dsa_slave_priv *p = netdev_priv(dev);
 447
 448         if (p->netpoll)
 449                 netpoll_send_skb(p->netpoll, skb);
 450 #else
 451         BUG();
 452 #endif
 453         return NETDEV_TX_OK;
 454 }
 455
 456 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 457                                  struct sk_buff *skb)
 458 {
 459         struct dsa_switch *ds = p->dp->ds;
 460         struct sk_buff *clone;
 461         unsigned int type;
 462
 463         type = ptp_classify_raw(skb);
 464         if (type == PTP_CLASS_NONE)
 465                 return;
 466
 467         if (!ds->ops->port_txtstamp)
 468                 return;
 469
 470         clone = skb_clone_sk(skb);
 471         if (!clone)
 472                 return;
 473
 474         DSA_SKB_CB(skb)->clone = clone;
 475
 476         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type))
 477                 return;
 478
 479         kfree_skb(clone);
 480 }
 481
 482 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 483 {
 484         /* SKB for netpoll still need to be mangled with the protocol-specific
 485          * tag to be successfully transmitted
 486          */
 487         if (unlikely(netpoll_tx_running(dev)))
 488                 return dsa_slave_netpoll_send_skb(dev, skb);
 489
 490         /* Queue the SKB for transmission on the parent interface, but
 491          * do not modify its EtherType
 492          */
 493         skb->dev = dsa_slave_to_master(dev);
 494         dev_queue_xmit(skb);
 495
 496         return NETDEV_TX_OK;
 497 }
 498 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 499
 500 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 501 {
 502         struct dsa_slave_priv *p = netdev_priv(dev);
 503         struct pcpu_sw_netstats *s;
 504         struct sk_buff *nskb;
 505
 506         s = this_cpu_ptr(p->stats64);
 507         u64_stats_update_begin(&s->syncp);
 508         s->tx_packets++;
 509         s->tx_bytes += skb->len;
 510         u64_stats_update_end(&s->syncp);
 511
 512         DSA_SKB_CB(skb)->clone = NULL;
 513
 514         /* Identify PTP protocol packets, clone them, and pass them to the
 515          * switch driver
 516          */
 517         dsa_skb_tx_timestamp(p, skb);
 518
 519         /* Transmit function may have to reallocate the original SKB,
 520          * in which case it must have freed it. Only free it here on error.
 521          */
 522         nskb = p->xmit(skb, dev);
 523         if (!nskb) {
 524                 kfree_skb(skb);
 525                 return NETDEV_TX_OK;
 526         }
 527
 528         return dsa_enqueue_skb(nskb, dev);
 529 }
 530
 531 /* ethtool operations *******************************************************/
 532
 533 static void dsa_slave_get_drvinfo(struct net_device *dev,
 534                                   struct ethtool_drvinfo *drvinfo)
 535 {
 536         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 537         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 538         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 539 }
 540
 541 static int dsa_slave_get_regs_len(struct net_device *dev)
 542 {
 543         struct dsa_port *dp = dsa_slave_to_port(dev);
 544         struct dsa_switch *ds = dp->ds;
 545
 546         if (ds->ops->get_regs_len)
 547                 return ds->ops->get_regs_len(ds, dp->index);
 548
 549         return -EOPNOTSUPP;
 550 }
 551
 552 static void
 553 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 554 {
 555         struct dsa_port *dp = dsa_slave_to_port(dev);
 556         struct dsa_switch *ds = dp->ds;
 557
 558         if (ds->ops->get_regs)
 559                 ds->ops->get_regs(ds, dp->index, regs, _p);
 560 }
 561
 562 static int dsa_slave_nway_reset(struct net_device *dev)
 563 {
 564         struct dsa_port *dp = dsa_slave_to_port(dev);
 565
 566         return phylink_ethtool_nway_reset(dp->pl);
 567 }
 568
 569 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 570 {
 571         struct dsa_port *dp = dsa_slave_to_port(dev);
 572         struct dsa_switch *ds = dp->ds;
 573
 574         if (ds->cd && ds->cd->eeprom_len)
 575                 return ds->cd->eeprom_len;
 576
 577         if (ds->ops->get_eeprom_len)
 578                 return ds->ops->get_eeprom_len(ds);
 579
 580         return 0;
 581 }
 582
 583 static int dsa_slave_get_eeprom(struct net_device *dev,
 584                                 struct ethtool_eeprom *eeprom, u8 *data)
 585 {
 586         struct dsa_port *dp = dsa_slave_to_port(dev);
 587         struct dsa_switch *ds = dp->ds;
 588
 589         if (ds->ops->get_eeprom)
 590                 return ds->ops->get_eeprom(ds, eeprom, data);
 591
 592         return -EOPNOTSUPP;
 593 }
 594
 595 static int dsa_slave_set_eeprom(struct net_device *dev,
 596                                 struct ethtool_eeprom *eeprom, u8 *data)
 597 {
 598         struct dsa_port *dp = dsa_slave_to_port(dev);
 599         struct dsa_switch *ds = dp->ds;
 600
 601         if (ds->ops->set_eeprom)
 602                 return ds->ops->set_eeprom(ds, eeprom, data);
 603
 604         return -EOPNOTSUPP;
 605 }
 606
 607 static void dsa_slave_get_strings(struct net_device *dev,
 608                                   uint32_t stringset, uint8_t *data)
 609 {
 610         struct dsa_port *dp = dsa_slave_to_port(dev);
 611         struct dsa_switch *ds = dp->ds;
 612
 613         if (stringset == ETH_SS_STATS) {
 614                 int len = ETH_GSTRING_LEN;
 615
 616                 strncpy(data, "tx_packets", len);
 617                 strncpy(data + len, "tx_bytes", len);
 618                 strncpy(data + 2 * len, "rx_packets", len);
 619                 strncpy(data + 3 * len, "rx_bytes", len);
 620                 if (ds->ops->get_strings)
 621                         ds->ops->get_strings(ds, dp->index, stringset,
 622                                              data + 4 * len);
 623         }
 624 }
 625
 626 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 627                                         struct ethtool_stats *stats,
 628                                         uint64_t *data)
 629 {
 630         struct dsa_port *dp = dsa_slave_to_port(dev);
 631         struct dsa_slave_priv *p = netdev_priv(dev);
 632         struct dsa_switch *ds = dp->ds;
 633         struct pcpu_sw_netstats *s;
 634         unsigned int start;
 635         int i;
 636
 637         for_each_possible_cpu(i) {
 638                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 639
 640                 s = per_cpu_ptr(p->stats64, i);
 641                 do {
 642                         start = u64_stats_fetch_begin_irq(&s->syncp);
 643                         tx_packets = s->tx_packets;
 644                         tx_bytes = s->tx_bytes;
 645                         rx_packets = s->rx_packets;
 646                         rx_bytes = s->rx_bytes;
 647                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 648                 data[0] += tx_packets;
 649                 data[1] += tx_bytes;
 650                 data[2] += rx_packets;
 651                 data[3] += rx_bytes;
 652         }
 653         if (ds->ops->get_ethtool_stats)
 654                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 655 }
 656
 657 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 658 {
 659         struct dsa_port *dp = dsa_slave_to_port(dev);
 660         struct dsa_switch *ds = dp->ds;
 661
 662         if (sset == ETH_SS_STATS) {
 663                 int count;
 664
 665                 count = 4;
 666                 if (ds->ops->get_sset_count)
 667                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 668
 669                 return count;
 670         }
 671
 672         return -EOPNOTSUPP;
 673 }
 674
 675 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 676 {
 677         struct dsa_port *dp = dsa_slave_to_port(dev);
 678         struct dsa_switch *ds = dp->ds;
 679
 680         phylink_ethtool_get_wol(dp->pl, w);
 681
 682         if (ds->ops->get_wol)
 683                 ds->ops->get_wol(ds, dp->index, w);
 684 }
 685
 686 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 687 {
 688         struct dsa_port *dp = dsa_slave_to_port(dev);
 689         struct dsa_switch *ds = dp->ds;
 690         int ret = -EOPNOTSUPP;
 691
 692         phylink_ethtool_set_wol(dp->pl, w);
 693
 694         if (ds->ops->set_wol)
 695                 ret = ds->ops->set_wol(ds, dp->index, w);
 696
 697         return ret;
 698 }
 699
 700 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 701 {
 702         struct dsa_port *dp = dsa_slave_to_port(dev);
 703         struct dsa_switch *ds = dp->ds;
 704         int ret;
 705
 706         /* Port's PHY and MAC both need to be EEE capable */
 707         if (!dev->phydev || !dp->pl)
 708                 return -ENODEV;
 709
 710         if (!ds->ops->set_mac_eee)
 711                 return -EOPNOTSUPP;
 712
 713         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 714         if (ret)
 715                 return ret;
 716
 717         return phylink_ethtool_set_eee(dp->pl, e);
 718 }
 719
 720 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 721 {
 722         struct dsa_port *dp = dsa_slave_to_port(dev);
 723         struct dsa_switch *ds = dp->ds;
 724         int ret;
 725
 726         /* Port's PHY and MAC both need to be EEE capable */
 727         if (!dev->phydev || !dp->pl)
 728                 return -ENODEV;
 729
 730         if (!ds->ops->get_mac_eee)
 731                 return -EOPNOTSUPP;
 732
 733         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 734         if (ret)
 735                 return ret;
 736
 737         return phylink_ethtool_get_eee(dp->pl, e);
 738 }
 739
 740 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 741                                         struct ethtool_link_ksettings *cmd)
 742 {
 743         struct dsa_port *dp = dsa_slave_to_port(dev);
 744
 745         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 746 }
 747
 748 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 749                                         const struct ethtool_link_ksettings *cmd)
 750 {
 751         struct dsa_port *dp = dsa_slave_to_port(dev);
 752
 753         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 754 }
 755
 756 static void dsa_slave_get_pauseparam(struct net_device *dev,
 757                                      struct ethtool_pauseparam *pause)
 758 {
 759         struct dsa_port *dp = dsa_slave_to_port(dev);
 760
 761         phylink_ethtool_get_pauseparam(dp->pl, pause);
 762 }
 763
 764 static int dsa_slave_set_pauseparam(struct net_device *dev,
 765                                     struct ethtool_pauseparam *pause)
 766 {
 767         struct dsa_port *dp = dsa_slave_to_port(dev);
 768
 769         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 770 }
 771
 772 #ifdef CONFIG_NET_POLL_CONTROLLER
 773 static int dsa_slave_netpoll_setup(struct net_device *dev,
 774                                    struct netpoll_info *ni)
 775 {
 776         struct net_device *master = dsa_slave_to_master(dev);
 777         struct dsa_slave_priv *p = netdev_priv(dev);
 778         struct netpoll *netpoll;
 779         int err = 0;
 780
 781         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 782         if (!netpoll)
 783                 return -ENOMEM;
 784
 785         err = __netpoll_setup(netpoll, master);
 786         if (err) {
 787                 kfree(netpoll);
 788                 goto out;
 789         }
 790
 791         p->netpoll = netpoll;
 792 out:
 793         return err;
 794 }
 795
 796 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 797 {
 798         struct dsa_slave_priv *p = netdev_priv(dev);
 799         struct netpoll *netpoll = p->netpoll;
 800
 801         if (!netpoll)
 802                 return;
 803
 804         p->netpoll = NULL;
 805
 806         __netpoll_free(netpoll);
 807 }
 808
 809 static void dsa_slave_poll_controller(struct net_device *dev)
 810 {
 811 }
 812 #endif
 813
 814 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 815                                         char *name, size_t len)
 816 {
 817         struct dsa_port *dp = dsa_slave_to_port(dev);
 818
 819         /* For non-legacy ports, devlink is used and it takes
 820          * care of the name generation. This ndo implementation
 821          * should be removed with legacy support.
 822          */
 823         if (dp->ds->devlink)
 824                 return -EOPNOTSUPP;
 825
 826         if (snprintf(name, len, "p%d", dp->index) >= len)
 827                 return -EINVAL;
 828
 829         return 0;
 830 }
 831
 832 static struct dsa_mall_tc_entry *
 833 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 834 {
 835         struct dsa_slave_priv *p = netdev_priv(dev);
 836         struct dsa_mall_tc_entry *mall_tc_entry;
 837
 838         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 839                 if (mall_tc_entry->cookie == cookie)
 840                         return mall_tc_entry;
 841
 842         return NULL;
 843 }
 844
 845 static int dsa_slave_add_cls_matchall(struct net_device *dev,
 846                                       struct tc_cls_matchall_offload *cls,
 847                                       bool ingress)
 848 {
 849         struct dsa_port *dp = dsa_slave_to_port(dev);
 850         struct dsa_slave_priv *p = netdev_priv(dev);
 851         struct dsa_mall_tc_entry *mall_tc_entry;
 852         __be16 protocol = cls->common.protocol;
 853         struct dsa_switch *ds = dp->ds;
 854         struct flow_action_entry *act;
 855         struct dsa_port *to_dp;
 856         int err = -EOPNOTSUPP;
 857
 858         if (!ds->ops->port_mirror_add)
 859                 return err;
 860
 861         if (!flow_offload_has_one_action(&cls->rule->action))
 862                 return err;
 863
 864         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 865                                               cls->common.extack))
 866                 return err;
 867
 868         act = &cls->rule->action.entries[0];
 869
 870         if (act->id == FLOW_ACTION_MIRRED && protocol == htons(ETH_P_ALL)) {
 871                 struct dsa_mall_mirror_tc_entry *mirror;
 872
 873                 if (!act->dev)
 874                         return -EINVAL;
 875
 876                 if (!dsa_slave_dev_check(act->dev))
 877                         return -EOPNOTSUPP;
 878
 879                 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 880                 if (!mall_tc_entry)
 881                         return -ENOMEM;
 882
 883                 mall_tc_entry->cookie = cls->cookie;
 884                 mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 885                 mirror = &mall_tc_entry->mirror;
 886
 887                 to_dp = dsa_slave_to_port(act->dev);
 888
 889                 mirror->to_local_port = to_dp->index;
 890                 mirror->ingress = ingress;
 891
 892                 err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 893                 if (err) {
 894                         kfree(mall_tc_entry);
 895                         return err;
 896                 }
 897
 898                 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 899         }
 900
 901         return 0;
 902 }
 903
 904 static void dsa_slave_del_cls_matchall(struct net_device *dev,
 905                                        struct tc_cls_matchall_offload *cls)
 906 {
 907         struct dsa_port *dp = dsa_slave_to_port(dev);
 908         struct dsa_mall_tc_entry *mall_tc_entry;
 909         struct dsa_switch *ds = dp->ds;
 910
 911         if (!ds->ops->port_mirror_del)
 912                 return;
 913
 914         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
 915         if (!mall_tc_entry)
 916                 return;
 917
 918         list_del(&mall_tc_entry->list);
 919
 920         switch (mall_tc_entry->type) {
 921         case DSA_PORT_MALL_MIRROR:
 922                 ds->ops->port_mirror_del(ds, dp->index, &mall_tc_entry->mirror);
 923                 break;
 924         default:
 925                 WARN_ON(1);
 926         }
 927
 928         kfree(mall_tc_entry);
 929 }
 930
 931 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
 932                                            struct tc_cls_matchall_offload *cls,
 933                                            bool ingress)
 934 {
 935         if (cls->common.chain_index)
 936                 return -EOPNOTSUPP;
 937
 938         switch (cls->command) {
 939         case TC_CLSMATCHALL_REPLACE:
 940                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
 941         case TC_CLSMATCHALL_DESTROY:
 942                 dsa_slave_del_cls_matchall(dev, cls);
 943                 return 0;
 944         default:
 945                 return -EOPNOTSUPP;
 946         }
 947 }
 948
 949 static int dsa_slave_add_cls_flower(struct net_device *dev,
 950                                     struct flow_cls_offload *cls,
 951                                     bool ingress)
 952 {
 953         struct dsa_port *dp = dsa_slave_to_port(dev);
 954         struct dsa_switch *ds = dp->ds;
 955         int port = dp->index;
 956
 957         if (!ds->ops->cls_flower_add)
 958                 return -EOPNOTSUPP;
 959
 960         return ds->ops->cls_flower_add(ds, port, cls, ingress);
 961 }
 962
 963 static int dsa_slave_del_cls_flower(struct net_device *dev,
 964                                     struct flow_cls_offload *cls,
 965                                     bool ingress)
 966 {
 967         struct dsa_port *dp = dsa_slave_to_port(dev);
 968         struct dsa_switch *ds = dp->ds;
 969         int port = dp->index;
 970
 971         if (!ds->ops->cls_flower_del)
 972                 return -EOPNOTSUPP;
 973
 974         return ds->ops->cls_flower_del(ds, port, cls, ingress);
 975 }
 976
 977 static int dsa_slave_stats_cls_flower(struct net_device *dev,
 978                                       struct flow_cls_offload *cls,
 979                                       bool ingress)
 980 {
 981         struct dsa_port *dp = dsa_slave_to_port(dev);
 982         struct dsa_switch *ds = dp->ds;
 983         int port = dp->index;
 984
 985         if (!ds->ops->cls_flower_stats)
 986                 return -EOPNOTSUPP;
 987
 988         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
 989 }
 990
 991 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
 992                                          struct flow_cls_offload *cls,
 993                                          bool ingress)
 994 {
 995         switch (cls->command) {
 996         case FLOW_CLS_REPLACE:
 997                 return dsa_slave_add_cls_flower(dev, cls, ingress);
 998         case FLOW_CLS_DESTROY:
 999                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1000         case FLOW_CLS_STATS:
1001                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1002         default:
1003                 return -EOPNOTSUPP;
1004         }
1005 }
1006
1007 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1008                                        void *cb_priv, bool ingress)
1009 {
1010         struct net_device *dev = cb_priv;
1011
1012         if (!tc_can_offload(dev))
1013                 return -EOPNOTSUPP;
1014
1015         switch (type) {
1016         case TC_SETUP_CLSMATCHALL:
1017                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1018         case TC_SETUP_CLSFLOWER:
1019                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1020         default:
1021                 return -EOPNOTSUPP;
1022         }
1023 }
1024
1025 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1026                                           void *type_data, void *cb_priv)
1027 {
1028         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1029 }
1030
1031 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1032                                           void *type_data, void *cb_priv)
1033 {
1034         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1035 }
1036
1037 static LIST_HEAD(dsa_slave_block_cb_list);
1038
1039 static int dsa_slave_setup_tc_block(struct net_device *dev,
1040                                     struct flow_block_offload *f)
1041 {
1042         struct flow_block_cb *block_cb;
1043         flow_setup_cb_t *cb;
1044
1045         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1046                 cb = dsa_slave_setup_tc_block_cb_ig;
1047         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1048                 cb = dsa_slave_setup_tc_block_cb_eg;
1049         else
1050                 return -EOPNOTSUPP;
1051
1052         f->driver_block_list = &dsa_slave_block_cb_list;
1053
1054         switch (f->command) {
1055         case FLOW_BLOCK_BIND:
1056                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1057                         return -EBUSY;
1058
1059                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1060                 if (IS_ERR(block_cb))
1061                         return PTR_ERR(block_cb);
1062
1063                 flow_block_cb_add(block_cb, f);
1064                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1065                 return 0;
1066         case FLOW_BLOCK_UNBIND:
1067                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1068                 if (!block_cb)
1069                         return -ENOENT;
1070
1071                 flow_block_cb_remove(block_cb, f);
1072                 list_del(&block_cb->driver_list);
1073                 return 0;
1074         default:
1075                 return -EOPNOTSUPP;
1076         }
1077 }
1078
1079 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1080                               void *type_data)
1081 {
1082         struct dsa_port *dp = dsa_slave_to_port(dev);
1083         struct dsa_switch *ds = dp->ds;
1084
1085         if (type == TC_SETUP_BLOCK)
1086                 return dsa_slave_setup_tc_block(dev, type_data);
1087
1088         if (!ds->ops->port_setup_tc)
1089                 return -EOPNOTSUPP;
1090
1091         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1092 }
1093
1094 static void dsa_slave_get_stats64(struct net_device *dev,
1095                                   struct rtnl_link_stats64 *stats)
1096 {
1097         struct dsa_slave_priv *p = netdev_priv(dev);
1098         struct pcpu_sw_netstats *s;
1099         unsigned int start;
1100         int i;
1101
1102         netdev_stats_to_stats64(stats, &dev->stats);
1103         for_each_possible_cpu(i) {
1104                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
1105
1106                 s = per_cpu_ptr(p->stats64, i);
1107                 do {
1108                         start = u64_stats_fetch_begin_irq(&s->syncp);
1109                         tx_packets = s->tx_packets;
1110                         tx_bytes = s->tx_bytes;
1111                         rx_packets = s->rx_packets;
1112                         rx_bytes = s->rx_bytes;
1113                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
1114
1115                 stats->tx_packets += tx_packets;
1116                 stats->tx_bytes += tx_bytes;
1117                 stats->rx_packets += rx_packets;
1118                 stats->rx_bytes += rx_bytes;
1119         }
1120 }
1121
1122 static int dsa_slave_get_rxnfc(struct net_device *dev,
1123                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1124 {
1125         struct dsa_port *dp = dsa_slave_to_port(dev);
1126         struct dsa_switch *ds = dp->ds;
1127
1128         if (!ds->ops->get_rxnfc)
1129                 return -EOPNOTSUPP;
1130
1131         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1132 }
1133
1134 static int dsa_slave_set_rxnfc(struct net_device *dev,
1135                                struct ethtool_rxnfc *nfc)
1136 {
1137         struct dsa_port *dp = dsa_slave_to_port(dev);
1138         struct dsa_switch *ds = dp->ds;
1139
1140         if (!ds->ops->set_rxnfc)
1141                 return -EOPNOTSUPP;
1142
1143         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1144 }
1145
1146 static int dsa_slave_get_ts_info(struct net_device *dev,
1147                                  struct ethtool_ts_info *ts)
1148 {
1149         struct dsa_slave_priv *p = netdev_priv(dev);
1150         struct dsa_switch *ds = p->dp->ds;
1151
1152         if (!ds->ops->get_ts_info)
1153                 return -EOPNOTSUPP;
1154
1155         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1156 }
1157
1158 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1159                                      u16 vid)
1160 {
1161         struct dsa_port *dp = dsa_slave_to_port(dev);
1162         struct bridge_vlan_info info;
1163         int ret;
1164
1165         /* Check for a possible bridge VLAN entry now since there is no
1166          * need to emulate the switchdev prepare + commit phase.
1167          */
1168         if (dp->bridge_dev) {
1169                 if (!br_vlan_enabled(dp->bridge_dev))
1170                         return 0;
1171
1172                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1173                  * device, respectively the VID is not found, returning
1174                  * 0 means success, which is a failure for us here.
1175                  */
1176                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1177                 if (ret == 0)
1178                         return -EBUSY;
1179         }
1180
1181         ret = dsa_port_vid_add(dp, vid, 0);
1182         if (ret)
1183                 return ret;
1184
1185         ret = dsa_port_vid_add(dp->cpu_dp, vid, 0);
1186         if (ret)
1187                 return ret;
1188
1189         return 0;
1190 }
1191
1192 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1193                                       u16 vid)
1194 {
1195         struct dsa_port *dp = dsa_slave_to_port(dev);
1196         struct bridge_vlan_info info;
1197         int ret;
1198
1199         /* Check for a possible bridge VLAN entry now since there is no
1200          * need to emulate the switchdev prepare + commit phase.
1201          */
1202         if (dp->bridge_dev) {
1203                 if (!br_vlan_enabled(dp->bridge_dev))
1204                         return 0;
1205
1206                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1207                  * device, respectively the VID is not found, returning
1208                  * 0 means success, which is a failure for us here.
1209                  */
1210                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1211                 if (ret == 0)
1212                         return -EBUSY;
1213         }
1214
1215         /* Do not deprogram the CPU port as it may be shared with other user
1216          * ports which can be members of this VLAN as well.
1217          */
1218         return dsa_port_vid_del(dp, vid);
1219 }
1220
1221 struct dsa_hw_port {
1222         struct list_head list;
1223         struct net_device *dev;
1224         int old_mtu;
1225 };
1226
1227 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1228 {
1229         const struct dsa_hw_port *p;
1230         int err;
1231
1232         list_for_each_entry(p, hw_port_list, list) {
1233                 if (p->dev->mtu == mtu)
1234                         continue;
1235
1236                 err = dev_set_mtu(p->dev, mtu);
1237                 if (err)
1238                         goto rollback;
1239         }
1240
1241         return 0;
1242
1243 rollback:
1244         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1245                 if (p->dev->mtu == p->old_mtu)
1246                         continue;
1247
1248                 if (dev_set_mtu(p->dev, p->old_mtu))
1249                         netdev_err(p->dev, "Failed to restore MTU\n");
1250         }
1251
1252         return err;
1253 }
1254
1255 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1256 {
1257         struct dsa_hw_port *p, *n;
1258
1259         list_for_each_entry_safe(p, n, hw_port_list, list)
1260                 kfree(p);
1261 }
1262
1263 /* Make the hardware datapath to/from @dev limited to a common MTU */
1264 void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1265 {
1266         struct list_head hw_port_list;
1267         struct dsa_switch_tree *dst;
1268         int min_mtu = ETH_MAX_MTU;
1269         struct dsa_port *other_dp;
1270         int err;
1271
1272         if (!dp->ds->mtu_enforcement_ingress)
1273                 return;
1274
1275         if (!dp->bridge_dev)
1276                 return;
1277
1278         INIT_LIST_HEAD(&hw_port_list);
1279
1280         /* Populate the list of ports that are part of the same bridge
1281          * as the newly added/modified port
1282          */
1283         list_for_each_entry(dst, &dsa_tree_list, list) {
1284                 list_for_each_entry(other_dp, &dst->ports, list) {
1285                         struct dsa_hw_port *hw_port;
1286                         struct net_device *slave;
1287
1288                         if (other_dp->type != DSA_PORT_TYPE_USER)
1289                                 continue;
1290
1291                         if (other_dp->bridge_dev != dp->bridge_dev)
1292                                 continue;
1293
1294                         if (!other_dp->ds->mtu_enforcement_ingress)
1295                                 continue;
1296
1297                         slave = other_dp->slave;
1298
1299                         if (min_mtu > slave->mtu)
1300                                 min_mtu = slave->mtu;
1301
1302                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1303                         if (!hw_port)
1304                                 goto out;
1305
1306                         hw_port->dev = slave;
1307                         hw_port->old_mtu = slave->mtu;
1308
1309                         list_add(&hw_port->list, &hw_port_list);
1310                 }
1311         }
1312
1313         /* Attempt to configure the entire hardware bridge to the newly added
1314          * interface's MTU first, regardless of whether the intention of the
1315          * user was to raise or lower it.
1316          */
1317         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1318         if (!err)
1319                 goto out;
1320
1321         /* Clearly that didn't work out so well, so just set the minimum MTU on
1322          * all hardware bridge ports now. If this fails too, then all ports will
1323          * still have their old MTU rolled back anyway.
1324          */
1325         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1326
1327 out:
1328         dsa_hw_port_list_free(&hw_port_list);
1329 }
1330
1331 static int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1332 {
1333         struct net_device *master = dsa_slave_to_master(dev);
1334         struct dsa_port *dp = dsa_slave_to_port(dev);
1335         struct dsa_slave_priv *p = netdev_priv(dev);
1336         struct dsa_switch *ds = p->dp->ds;
1337         struct dsa_port *cpu_dp;
1338         int port = p->dp->index;
1339         int largest_mtu = 0;
1340         int new_master_mtu;
1341         int old_master_mtu;
1342         int mtu_limit;
1343         int cpu_mtu;
1344         int err, i;
1345
1346         if (!ds->ops->port_change_mtu)
1347                 return -EOPNOTSUPP;
1348
1349         for (i = 0; i < ds->num_ports; i++) {
1350                 int slave_mtu;
1351
1352                 if (!dsa_is_user_port(ds, i))
1353                         continue;
1354
1355                 /* During probe, this function will be called for each slave
1356                  * device, while not all of them have been allocated. That's
1357                  * ok, it doesn't change what the maximum is, so ignore it.
1358                  */
1359                 if (!dsa_to_port(ds, i)->slave)
1360                         continue;
1361
1362                 /* Pretend that we already applied the setting, which we
1363                  * actually haven't (still haven't done all integrity checks)
1364                  */
1365                 if (i == port)
1366                         slave_mtu = new_mtu;
1367                 else
1368                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1369
1370                 if (largest_mtu < slave_mtu)
1371                         largest_mtu = slave_mtu;
1372         }
1373
1374         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1375
1376         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1377         old_master_mtu = master->mtu;
1378         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1379         if (new_master_mtu > mtu_limit)
1380                 return -ERANGE;
1381
1382         /* If the master MTU isn't over limit, there's no need to check the CPU
1383          * MTU, since that surely isn't either.
1384          */
1385         cpu_mtu = largest_mtu;
1386
1387         /* Start applying stuff */
1388         if (new_master_mtu != old_master_mtu) {
1389                 err = dev_set_mtu(master, new_master_mtu);
1390                 if (err < 0)
1391                         goto out_master_failed;
1392
1393                 /* We only need to propagate the MTU of the CPU port to
1394                  * upstream switches.
1395                  */
1396                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1397                 if (err)
1398                         goto out_cpu_failed;
1399         }
1400
1401         err = dsa_port_mtu_change(dp, new_mtu, false);
1402         if (err)
1403                 goto out_port_failed;
1404
1405         dev->mtu = new_mtu;
1406
1407         dsa_bridge_mtu_normalization(dp);
1408
1409         return 0;
1410
1411 out_port_failed:
1412         if (new_master_mtu != old_master_mtu)
1413                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1414                                     cpu_dp->tag_ops->overhead,
1415                                     true);
1416 out_cpu_failed:
1417         if (new_master_mtu != old_master_mtu)
1418                 dev_set_mtu(master, old_master_mtu);
1419 out_master_failed:
1420         return err;
1421 }
1422
1423 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1424         .get_drvinfo            = dsa_slave_get_drvinfo,
1425         .get_regs_len           = dsa_slave_get_regs_len,
1426         .get_regs               = dsa_slave_get_regs,
1427         .nway_reset             = dsa_slave_nway_reset,
1428         .get_link               = ethtool_op_get_link,
1429         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1430         .get_eeprom             = dsa_slave_get_eeprom,
1431         .set_eeprom             = dsa_slave_set_eeprom,
1432         .get_strings            = dsa_slave_get_strings,
1433         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1434         .get_sset_count         = dsa_slave_get_sset_count,
1435         .set_wol                = dsa_slave_set_wol,
1436         .get_wol                = dsa_slave_get_wol,
1437         .set_eee                = dsa_slave_set_eee,
1438         .get_eee                = dsa_slave_get_eee,
1439         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1440         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1441         .get_pauseparam         = dsa_slave_get_pauseparam,
1442         .set_pauseparam         = dsa_slave_set_pauseparam,
1443         .get_rxnfc              = dsa_slave_get_rxnfc,
1444         .set_rxnfc              = dsa_slave_set_rxnfc,
1445         .get_ts_info            = dsa_slave_get_ts_info,
1446 };
1447
1448 /* legacy way, bypassing the bridge *****************************************/
1449 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1450                        struct net_device *dev,
1451                        const unsigned char *addr, u16 vid,
1452                        u16 flags,
1453                        struct netlink_ext_ack *extack)
1454 {
1455         struct dsa_port *dp = dsa_slave_to_port(dev);
1456
1457         return dsa_port_fdb_add(dp, addr, vid);
1458 }
1459
1460 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1461                        struct net_device *dev,
1462                        const unsigned char *addr, u16 vid)
1463 {
1464         struct dsa_port *dp = dsa_slave_to_port(dev);
1465
1466         return dsa_port_fdb_del(dp, addr, vid);
1467 }
1468
1469 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1470 {
1471         struct dsa_port *dp = dsa_slave_to_port(dev);
1472
1473         return dp->ds->devlink ? &dp->devlink_port : NULL;
1474 }
1475
1476 static const struct net_device_ops dsa_slave_netdev_ops = {
1477         .ndo_open               = dsa_slave_open,
1478         .ndo_stop               = dsa_slave_close,
1479         .ndo_start_xmit         = dsa_slave_xmit,
1480         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1481         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1482         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1483         .ndo_fdb_add            = dsa_legacy_fdb_add,
1484         .ndo_fdb_del            = dsa_legacy_fdb_del,
1485         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1486         .ndo_do_ioctl           = dsa_slave_ioctl,
1487         .ndo_get_iflink         = dsa_slave_get_iflink,
1488 #ifdef CONFIG_NET_POLL_CONTROLLER
1489         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1490         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1491         .ndo_poll_controller    = dsa_slave_poll_controller,
1492 #endif
1493         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1494         .ndo_setup_tc           = dsa_slave_setup_tc,
1495         .ndo_get_stats64        = dsa_slave_get_stats64,
1496         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1497         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1498         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1499         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1500         .ndo_change_mtu         = dsa_slave_change_mtu,
1501 };
1502
1503 static struct device_type dsa_type = {
1504         .name   = "dsa",
1505 };
1506
1507 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1508 {
1509         const struct dsa_port *dp = dsa_to_port(ds, port);
1510
1511         phylink_mac_change(dp->pl, up);
1512 }
1513 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1514
1515 static void dsa_slave_phylink_fixed_state(struct net_device *dev,
1516                                           struct phylink_link_state *state)
1517 {
1518         struct dsa_port *dp = dsa_slave_to_port(dev);
1519         struct dsa_switch *ds = dp->ds;
1520
1521         /* No need to check that this operation is valid, the callback would
1522          * not be called if it was not.
1523          */
1524         ds->ops->phylink_fixed_state(ds, dp->index, state);
1525 }
1526
1527 /* slave device setup *******************************************************/
1528 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1529 {
1530         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1531         struct dsa_switch *ds = dp->ds;
1532
1533         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1534         if (!slave_dev->phydev) {
1535                 netdev_err(slave_dev, "no phy at %d\n", addr);
1536                 return -ENODEV;
1537         }
1538
1539         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1540 }
1541
1542 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1543 {
1544         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1545         struct device_node *port_dn = dp->dn;
1546         struct dsa_switch *ds = dp->ds;
1547         phy_interface_t mode;
1548         u32 phy_flags = 0;
1549         int ret;
1550
1551         ret = of_get_phy_mode(port_dn, &mode);
1552         if (ret)
1553                 mode = PHY_INTERFACE_MODE_NA;
1554
1555         dp->pl_config.dev = &slave_dev->dev;
1556         dp->pl_config.type = PHYLINK_NETDEV;
1557
1558         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1559                                 &dsa_port_phylink_mac_ops);
1560         if (IS_ERR(dp->pl)) {
1561                 netdev_err(slave_dev,
1562                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1563                 return PTR_ERR(dp->pl);
1564         }
1565
1566         /* Register only if the switch provides such a callback, since this
1567          * callback takes precedence over polling the link GPIO in PHYLINK
1568          * (see phylink_get_fixed_state).
1569          */
1570         if (ds->ops->phylink_fixed_state)
1571                 phylink_fixed_state_cb(dp->pl, dsa_slave_phylink_fixed_state);
1572
1573         if (ds->ops->get_phy_flags)
1574                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1575
1576         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1577         if (ret == -ENODEV && ds->slave_mii_bus) {
1578                 /* We could not connect to a designated PHY or SFP, so try to
1579                  * use the switch internal MDIO bus instead
1580                  */
1581                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1582                 if (ret) {
1583                         netdev_err(slave_dev,
1584                                    "failed to connect to port %d: %d\n",
1585                                    dp->index, ret);
1586                         phylink_destroy(dp->pl);
1587                         return ret;
1588                 }
1589         }
1590
1591         return ret;
1592 }
1593
1594 int dsa_slave_suspend(struct net_device *slave_dev)
1595 {
1596         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1597
1598         if (!netif_running(slave_dev))
1599                 return 0;
1600
1601         netif_device_detach(slave_dev);
1602
1603         rtnl_lock();
1604         phylink_stop(dp->pl);
1605         rtnl_unlock();
1606
1607         return 0;
1608 }
1609
1610 int dsa_slave_resume(struct net_device *slave_dev)
1611 {
1612         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1613
1614         if (!netif_running(slave_dev))
1615                 return 0;
1616
1617         netif_device_attach(slave_dev);
1618
1619         rtnl_lock();
1620         phylink_start(dp->pl);
1621         rtnl_unlock();
1622
1623         return 0;
1624 }
1625
1626 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1627 {
1628         struct net_device *master = dsa_slave_to_master(dev);
1629         struct dsa_port *dp = dsa_slave_to_port(dev);
1630         struct dsa_notifier_register_info rinfo = {
1631                 .switch_number = dp->ds->index,
1632                 .port_number = dp->index,
1633                 .master = master,
1634                 .info.dev = dev,
1635         };
1636
1637         call_dsa_notifiers(val, dev, &rinfo.info);
1638 }
1639
1640 int dsa_slave_create(struct dsa_port *port)
1641 {
1642         const struct dsa_port *cpu_dp = port->cpu_dp;
1643         struct net_device *master = cpu_dp->master;
1644         struct dsa_switch *ds = port->ds;
1645         const char *name = port->name;
1646         struct net_device *slave_dev;
1647         struct dsa_slave_priv *p;
1648         int ret;
1649
1650         if (!ds->num_tx_queues)
1651                 ds->num_tx_queues = 1;
1652
1653         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1654                                      NET_NAME_UNKNOWN, ether_setup,
1655                                      ds->num_tx_queues, 1);
1656         if (slave_dev == NULL)
1657                 return -ENOMEM;
1658
1659         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1660         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1661                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1662         slave_dev->hw_features |= NETIF_F_HW_TC;
1663         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1664         if (!IS_ERR_OR_NULL(port->mac))
1665                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1666         else
1667                 eth_hw_addr_inherit(slave_dev, master);
1668         slave_dev->priv_flags |= IFF_NO_QUEUE;
1669         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1670         slave_dev->min_mtu = 0;
1671         if (ds->ops->port_max_mtu)
1672                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1673         else
1674                 slave_dev->max_mtu = ETH_MAX_MTU;
1675         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1676
1677         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1678         slave_dev->dev.of_node = port->dn;
1679         slave_dev->vlan_features = master->vlan_features;
1680
1681         p = netdev_priv(slave_dev);
1682         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1683         if (!p->stats64) {
1684                 free_netdev(slave_dev);
1685                 return -ENOMEM;
1686         }
1687         p->dp = port;
1688         INIT_LIST_HEAD(&p->mall_tc_list);
1689         p->xmit = cpu_dp->tag_ops->xmit;
1690         port->slave = slave_dev;
1691
1692         rtnl_lock();
1693         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1694         rtnl_unlock();
1695         if (ret && ret != -EOPNOTSUPP) {
1696                 dev_err(ds->dev, "error %d setting MTU on port %d\n",
1697                         ret, port->index);
1698                 goto out_free;
1699         }
1700
1701         netif_carrier_off(slave_dev);
1702
1703         ret = dsa_slave_phy_setup(slave_dev);
1704         if (ret) {
1705                 netdev_err(master, "error %d setting up slave phy\n", ret);
1706                 goto out_free;
1707         }
1708
1709         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1710
1711         ret = register_netdev(slave_dev);
1712         if (ret) {
1713                 netdev_err(master, "error %d registering interface %s\n",
1714                            ret, slave_dev->name);
1715                 goto out_phy;
1716         }
1717
1718         return 0;
1719
1720 out_phy:
1721         rtnl_lock();
1722         phylink_disconnect_phy(p->dp->pl);
1723         rtnl_unlock();
1724         phylink_destroy(p->dp->pl);
1725 out_free:
1726         free_percpu(p->stats64);
1727         free_netdev(slave_dev);
1728         port->slave = NULL;
1729         return ret;
1730 }
1731
1732 void dsa_slave_destroy(struct net_device *slave_dev)
1733 {
1734         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1735         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1736
1737         netif_carrier_off(slave_dev);
1738         rtnl_lock();
1739         phylink_disconnect_phy(dp->pl);
1740         rtnl_unlock();
1741
1742         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1743         unregister_netdev(slave_dev);
1744         phylink_destroy(dp->pl);
1745         free_percpu(p->stats64);
1746         free_netdev(slave_dev);
1747 }
1748
1749 bool dsa_slave_dev_check(const struct net_device *dev)
1750 {
1751         return dev->netdev_ops == &dsa_slave_netdev_ops;
1752 }
1753
1754 static int dsa_slave_changeupper(struct net_device *dev,
1755                                  struct netdev_notifier_changeupper_info *info)
1756 {
1757         struct dsa_port *dp = dsa_slave_to_port(dev);
1758         int err = NOTIFY_DONE;
1759
1760         if (netif_is_bridge_master(info->upper_dev)) {
1761                 if (info->linking) {
1762                         err = dsa_port_bridge_join(dp, info->upper_dev);
1763                         if (!err)
1764                                 dsa_bridge_mtu_normalization(dp);
1765                         err = notifier_from_errno(err);
1766                 } else {
1767                         dsa_port_bridge_leave(dp, info->upper_dev);
1768                         err = NOTIFY_OK;
1769                 }
1770         }
1771
1772         return err;
1773 }
1774
1775 static int dsa_slave_upper_vlan_check(struct net_device *dev,
1776                                       struct netdev_notifier_changeupper_info *
1777                                       info)
1778 {
1779         struct netlink_ext_ack *ext_ack;
1780         struct net_device *slave;
1781         struct dsa_port *dp;
1782
1783         ext_ack = netdev_notifier_info_to_extack(&info->info);
1784
1785         if (!is_vlan_dev(dev))
1786                 return NOTIFY_DONE;
1787
1788         slave = vlan_dev_real_dev(dev);
1789         if (!dsa_slave_dev_check(slave))
1790                 return NOTIFY_DONE;
1791
1792         dp = dsa_slave_to_port(slave);
1793         if (!dp->bridge_dev)
1794                 return NOTIFY_DONE;
1795
1796         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1797         if (br_vlan_enabled(dp->bridge_dev) &&
1798             netif_is_bridge_master(info->upper_dev) && info->linking) {
1799                 NL_SET_ERR_MSG_MOD(ext_ack,
1800                                    "Cannot enslave VLAN device into VLAN aware bridge");
1801                 return notifier_from_errno(-EINVAL);
1802         }
1803
1804         return NOTIFY_DONE;
1805 }
1806
1807 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1808                                      unsigned long event, void *ptr)
1809 {
1810         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1811
1812         if (event == NETDEV_CHANGEUPPER) {
1813                 if (!dsa_slave_dev_check(dev))
1814                         return dsa_slave_upper_vlan_check(dev, ptr);
1815
1816                 return dsa_slave_changeupper(dev, ptr);
1817         }
1818
1819         return NOTIFY_DONE;
1820 }
1821
1822 struct dsa_switchdev_event_work {
1823         struct work_struct work;
1824         struct switchdev_notifier_fdb_info fdb_info;
1825         struct net_device *dev;
1826         unsigned long event;
1827 };
1828
1829 static void dsa_slave_switchdev_event_work(struct work_struct *work)
1830 {
1831         struct dsa_switchdev_event_work *switchdev_work =
1832                 container_of(work, struct dsa_switchdev_event_work, work);
1833         struct net_device *dev = switchdev_work->dev;
1834         struct switchdev_notifier_fdb_info *fdb_info;
1835         struct dsa_port *dp = dsa_slave_to_port(dev);
1836         int err;
1837
1838         rtnl_lock();
1839         switch (switchdev_work->event) {
1840         case SWITCHDEV_FDB_ADD_TO_DEVICE:
1841                 fdb_info = &switchdev_work->fdb_info;
1842                 if (!fdb_info->added_by_user)
1843                         break;
1844
1845                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
1846                 if (err) {
1847                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
1848                         break;
1849                 }
1850                 fdb_info->offloaded = true;
1851                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
1852                                          &fdb_info->info, NULL);
1853                 break;
1854
1855         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1856                 fdb_info = &switchdev_work->fdb_info;
1857                 if (!fdb_info->added_by_user)
1858                         break;
1859
1860                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
1861                 if (err) {
1862                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
1863                         dev_close(dev);
1864                 }
1865                 break;
1866         }
1867         rtnl_unlock();
1868
1869         kfree(switchdev_work->fdb_info.addr);
1870         kfree(switchdev_work);
1871         dev_put(dev);
1872 }
1873
1874 static int
1875 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
1876                                   switchdev_work,
1877                                   const struct switchdev_notifier_fdb_info *
1878                                   fdb_info)
1879 {
1880         memcpy(&switchdev_work->fdb_info, fdb_info,
1881                sizeof(switchdev_work->fdb_info));
1882         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
1883         if (!switchdev_work->fdb_info.addr)
1884                 return -ENOMEM;
1885         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
1886                         fdb_info->addr);
1887         return 0;
1888 }
1889
1890 /* Called under rcu_read_lock() */
1891 static int dsa_slave_switchdev_event(struct notifier_block *unused,
1892                                      unsigned long event, void *ptr)
1893 {
1894         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1895         struct dsa_switchdev_event_work *switchdev_work;
1896         int err;
1897
1898         if (event == SWITCHDEV_PORT_ATTR_SET) {
1899                 err = switchdev_handle_port_attr_set(dev, ptr,
1900                                                      dsa_slave_dev_check,
1901                                                      dsa_slave_port_attr_set);
1902                 return notifier_from_errno(err);
1903         }
1904
1905         if (!dsa_slave_dev_check(dev))
1906                 return NOTIFY_DONE;
1907
1908         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
1909         if (!switchdev_work)
1910                 return NOTIFY_BAD;
1911
1912         INIT_WORK(&switchdev_work->work,
1913                   dsa_slave_switchdev_event_work);
1914         switchdev_work->dev = dev;
1915         switchdev_work->event = event;
1916
1917         switch (event) {
1918         case SWITCHDEV_FDB_ADD_TO_DEVICE: /* fall through */
1919         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1920                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
1921                         goto err_fdb_work_init;
1922                 dev_hold(dev);
1923                 break;
1924         default:
1925                 kfree(switchdev_work);
1926                 return NOTIFY_DONE;
1927         }
1928
1929         dsa_schedule_work(&switchdev_work->work);
1930         return NOTIFY_OK;
1931
1932 err_fdb_work_init:
1933         kfree(switchdev_work);
1934         return NOTIFY_BAD;
1935 }
1936
1937 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
1938                                               unsigned long event, void *ptr)
1939 {
1940         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1941         int err;
1942
1943         switch (event) {
1944         case SWITCHDEV_PORT_OBJ_ADD:
1945                 err = switchdev_handle_port_obj_add(dev, ptr,
1946                                                     dsa_slave_dev_check,
1947                                                     dsa_slave_port_obj_add);
1948                 return notifier_from_errno(err);
1949         case SWITCHDEV_PORT_OBJ_DEL:
1950                 err = switchdev_handle_port_obj_del(dev, ptr,
1951                                                     dsa_slave_dev_check,
1952                                                     dsa_slave_port_obj_del);
1953                 return notifier_from_errno(err);
1954         case SWITCHDEV_PORT_ATTR_SET:
1955                 err = switchdev_handle_port_attr_set(dev, ptr,
1956                                                      dsa_slave_dev_check,
1957                                                      dsa_slave_port_attr_set);
1958                 return notifier_from_errno(err);
1959         }
1960
1961         return NOTIFY_DONE;
1962 }
1963
1964 static struct notifier_block dsa_slave_nb __read_mostly = {
1965         .notifier_call  = dsa_slave_netdevice_event,
1966 };
1967
1968 static struct notifier_block dsa_slave_switchdev_notifier = {
1969         .notifier_call = dsa_slave_switchdev_event,
1970 };
1971
1972 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
1973         .notifier_call = dsa_slave_switchdev_blocking_event,
1974 };
1975
1976 int dsa_slave_register_notifier(void)
1977 {
1978         struct notifier_block *nb;
1979         int err;
1980
1981         err = register_netdevice_notifier(&dsa_slave_nb);
1982         if (err)
1983                 return err;
1984
1985         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
1986         if (err)
1987                 goto err_switchdev_nb;
1988
1989         nb = &dsa_slave_switchdev_blocking_notifier;
1990         err = register_switchdev_blocking_notifier(nb);
1991         if (err)
1992                 goto err_switchdev_blocking_nb;
1993
1994         return 0;
1995
1996 err_switchdev_blocking_nb:
1997         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
1998 err_switchdev_nb:
1999         unregister_netdevice_notifier(&dsa_slave_nb);
2000         return err;
2001 }
2002
2003 void dsa_slave_unregister_notifier(void)
2004 {
2005         struct notifier_block *nb;
2006         int err;
2007
2008         nb = &dsa_slave_switchdev_blocking_notifier;
2009         err = unregister_switchdev_blocking_notifier(nb);
2010         if (err)
2011                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2012
2013         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2014         if (err)
2015                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2016
2017         err = unregister_netdevice_notifier(&dsa_slave_nb);
2018         if (err)
2019                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2020 }