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