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
 846 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 847                                   struct tc_cls_matchall_offload *cls,
 848                                   bool ingress)
 849 {
 850         struct dsa_port *dp = dsa_slave_to_port(dev);
 851         struct dsa_slave_priv *p = netdev_priv(dev);
 852         struct dsa_mall_mirror_tc_entry *mirror;
 853         struct dsa_mall_tc_entry *mall_tc_entry;
 854         struct dsa_switch *ds = dp->ds;
 855         struct flow_action_entry *act;
 856         struct dsa_port *to_dp;
 857         int err;
 858
 859         if (!ds->ops->port_mirror_add)
 860                 return -EOPNOTSUPP;
 861
 862         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 863                                               cls->common.extack))
 864                 return -EOPNOTSUPP;
 865
 866         act = &cls->rule->action.entries[0];
 867
 868         if (!act->dev)
 869                 return -EINVAL;
 870
 871         if (!dsa_slave_dev_check(act->dev))
 872                 return -EOPNOTSUPP;
 873
 874         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 875         if (!mall_tc_entry)
 876                 return -ENOMEM;
 877
 878         mall_tc_entry->cookie = cls->cookie;
 879         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 880         mirror = &mall_tc_entry->mirror;
 881
 882         to_dp = dsa_slave_to_port(act->dev);
 883
 884         mirror->to_local_port = to_dp->index;
 885         mirror->ingress = ingress;
 886
 887         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 888         if (err) {
 889                 kfree(mall_tc_entry);
 890                 return err;
 891         }
 892
 893         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 894
 895         return err;
 896 }
 897
 898 static int
 899 dsa_slave_add_cls_matchall_police(struct net_device *dev,
 900                                   struct tc_cls_matchall_offload *cls,
 901                                   bool ingress)
 902 {
 903         struct netlink_ext_ack *extack = cls->common.extack;
 904         struct dsa_port *dp = dsa_slave_to_port(dev);
 905         struct dsa_slave_priv *p = netdev_priv(dev);
 906         struct dsa_mall_policer_tc_entry *policer;
 907         struct dsa_mall_tc_entry *mall_tc_entry;
 908         struct dsa_switch *ds = dp->ds;
 909         struct flow_action_entry *act;
 910         int err;
 911
 912         if (!ds->ops->port_policer_add) {
 913                 NL_SET_ERR_MSG_MOD(extack,
 914                                    "Policing offload not implemented\n");
 915                 return -EOPNOTSUPP;
 916         }
 917
 918         if (!ingress) {
 919                 NL_SET_ERR_MSG_MOD(extack,
 920                                    "Only supported on ingress qdisc\n");
 921                 return -EOPNOTSUPP;
 922         }
 923
 924         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 925                                               cls->common.extack))
 926                 return -EOPNOTSUPP;
 927
 928         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
 929                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
 930                         NL_SET_ERR_MSG_MOD(extack,
 931                                            "Only one port policer allowed\n");
 932                         return -EEXIST;
 933                 }
 934         }
 935
 936         act = &cls->rule->action.entries[0];
 937
 938         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 939         if (!mall_tc_entry)
 940                 return -ENOMEM;
 941
 942         mall_tc_entry->cookie = cls->cookie;
 943         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
 944         policer = &mall_tc_entry->policer;
 945         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
 946         policer->burst = act->police.burst;
 947
 948         err = ds->ops->port_policer_add(ds, dp->index, policer);
 949         if (err) {
 950                 kfree(mall_tc_entry);
 951                 return err;
 952         }
 953
 954         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 955
 956         return err;
 957 }
 958
 959 static int dsa_slave_add_cls_matchall(struct net_device *dev,
 960                                       struct tc_cls_matchall_offload *cls,
 961                                       bool ingress)
 962 {
 963         int err = -EOPNOTSUPP;
 964
 965         if (cls->common.protocol == htons(ETH_P_ALL) &&
 966             flow_offload_has_one_action(&cls->rule->action) &&
 967             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
 968                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
 969         else if (flow_offload_has_one_action(&cls->rule->action) &&
 970                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
 971                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
 972
 973         return err;
 974 }
 975
 976 static void dsa_slave_del_cls_matchall(struct net_device *dev,
 977                                        struct tc_cls_matchall_offload *cls)
 978 {
 979         struct dsa_port *dp = dsa_slave_to_port(dev);
 980         struct dsa_mall_tc_entry *mall_tc_entry;
 981         struct dsa_switch *ds = dp->ds;
 982
 983         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
 984         if (!mall_tc_entry)
 985                 return;
 986
 987         list_del(&mall_tc_entry->list);
 988
 989         switch (mall_tc_entry->type) {
 990         case DSA_PORT_MALL_MIRROR:
 991                 if (ds->ops->port_mirror_del)
 992                         ds->ops->port_mirror_del(ds, dp->index,
 993                                                  &mall_tc_entry->mirror);
 994                 break;
 995         case DSA_PORT_MALL_POLICER:
 996                 if (ds->ops->port_policer_del)
 997                         ds->ops->port_policer_del(ds, dp->index);
 998                 break;
 999         default:
1000                 WARN_ON(1);
1001         }
1002
1003         kfree(mall_tc_entry);
1004 }
1005
1006 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1007                                            struct tc_cls_matchall_offload *cls,
1008                                            bool ingress)
1009 {
1010         if (cls->common.chain_index)
1011                 return -EOPNOTSUPP;
1012
1013         switch (cls->command) {
1014         case TC_CLSMATCHALL_REPLACE:
1015                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1016         case TC_CLSMATCHALL_DESTROY:
1017                 dsa_slave_del_cls_matchall(dev, cls);
1018                 return 0;
1019         default:
1020                 return -EOPNOTSUPP;
1021         }
1022 }
1023
1024 static int dsa_slave_add_cls_flower(struct net_device *dev,
1025                                     struct flow_cls_offload *cls,
1026                                     bool ingress)
1027 {
1028         struct dsa_port *dp = dsa_slave_to_port(dev);
1029         struct dsa_switch *ds = dp->ds;
1030         int port = dp->index;
1031
1032         if (!ds->ops->cls_flower_add)
1033                 return -EOPNOTSUPP;
1034
1035         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1036 }
1037
1038 static int dsa_slave_del_cls_flower(struct net_device *dev,
1039                                     struct flow_cls_offload *cls,
1040                                     bool ingress)
1041 {
1042         struct dsa_port *dp = dsa_slave_to_port(dev);
1043         struct dsa_switch *ds = dp->ds;
1044         int port = dp->index;
1045
1046         if (!ds->ops->cls_flower_del)
1047                 return -EOPNOTSUPP;
1048
1049         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1050 }
1051
1052 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1053                                       struct flow_cls_offload *cls,
1054                                       bool ingress)
1055 {
1056         struct dsa_port *dp = dsa_slave_to_port(dev);
1057         struct dsa_switch *ds = dp->ds;
1058         int port = dp->index;
1059
1060         if (!ds->ops->cls_flower_stats)
1061                 return -EOPNOTSUPP;
1062
1063         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1064 }
1065
1066 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1067                                          struct flow_cls_offload *cls,
1068                                          bool ingress)
1069 {
1070         switch (cls->command) {
1071         case FLOW_CLS_REPLACE:
1072                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1073         case FLOW_CLS_DESTROY:
1074                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1075         case FLOW_CLS_STATS:
1076                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1077         default:
1078                 return -EOPNOTSUPP;
1079         }
1080 }
1081
1082 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1083                                        void *cb_priv, bool ingress)
1084 {
1085         struct net_device *dev = cb_priv;
1086
1087         if (!tc_can_offload(dev))
1088                 return -EOPNOTSUPP;
1089
1090         switch (type) {
1091         case TC_SETUP_CLSMATCHALL:
1092                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1093         case TC_SETUP_CLSFLOWER:
1094                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1095         default:
1096                 return -EOPNOTSUPP;
1097         }
1098 }
1099
1100 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1101                                           void *type_data, void *cb_priv)
1102 {
1103         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1104 }
1105
1106 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1107                                           void *type_data, void *cb_priv)
1108 {
1109         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1110 }
1111
1112 static LIST_HEAD(dsa_slave_block_cb_list);
1113
1114 static int dsa_slave_setup_tc_block(struct net_device *dev,
1115                                     struct flow_block_offload *f)
1116 {
1117         struct flow_block_cb *block_cb;
1118         flow_setup_cb_t *cb;
1119
1120         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1121                 cb = dsa_slave_setup_tc_block_cb_ig;
1122         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1123                 cb = dsa_slave_setup_tc_block_cb_eg;
1124         else
1125                 return -EOPNOTSUPP;
1126
1127         f->driver_block_list = &dsa_slave_block_cb_list;
1128
1129         switch (f->command) {
1130         case FLOW_BLOCK_BIND:
1131                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1132                         return -EBUSY;
1133
1134                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1135                 if (IS_ERR(block_cb))
1136                         return PTR_ERR(block_cb);
1137
1138                 flow_block_cb_add(block_cb, f);
1139                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1140                 return 0;
1141         case FLOW_BLOCK_UNBIND:
1142                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1143                 if (!block_cb)
1144                         return -ENOENT;
1145
1146                 flow_block_cb_remove(block_cb, f);
1147                 list_del(&block_cb->driver_list);
1148                 return 0;
1149         default:
1150                 return -EOPNOTSUPP;
1151         }
1152 }
1153
1154 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1155                               void *type_data)
1156 {
1157         struct dsa_port *dp = dsa_slave_to_port(dev);
1158         struct dsa_switch *ds = dp->ds;
1159
1160         if (type == TC_SETUP_BLOCK)
1161                 return dsa_slave_setup_tc_block(dev, type_data);
1162
1163         if (!ds->ops->port_setup_tc)
1164                 return -EOPNOTSUPP;
1165
1166         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1167 }
1168
1169 static void dsa_slave_get_stats64(struct net_device *dev,
1170                                   struct rtnl_link_stats64 *stats)
1171 {
1172         struct dsa_slave_priv *p = netdev_priv(dev);
1173         struct pcpu_sw_netstats *s;
1174         unsigned int start;
1175         int i;
1176
1177         netdev_stats_to_stats64(stats, &dev->stats);
1178         for_each_possible_cpu(i) {
1179                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
1180
1181                 s = per_cpu_ptr(p->stats64, i);
1182                 do {
1183                         start = u64_stats_fetch_begin_irq(&s->syncp);
1184                         tx_packets = s->tx_packets;
1185                         tx_bytes = s->tx_bytes;
1186                         rx_packets = s->rx_packets;
1187                         rx_bytes = s->rx_bytes;
1188                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
1189
1190                 stats->tx_packets += tx_packets;
1191                 stats->tx_bytes += tx_bytes;
1192                 stats->rx_packets += rx_packets;
1193                 stats->rx_bytes += rx_bytes;
1194         }
1195 }
1196
1197 static int dsa_slave_get_rxnfc(struct net_device *dev,
1198                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1199 {
1200         struct dsa_port *dp = dsa_slave_to_port(dev);
1201         struct dsa_switch *ds = dp->ds;
1202
1203         if (!ds->ops->get_rxnfc)
1204                 return -EOPNOTSUPP;
1205
1206         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1207 }
1208
1209 static int dsa_slave_set_rxnfc(struct net_device *dev,
1210                                struct ethtool_rxnfc *nfc)
1211 {
1212         struct dsa_port *dp = dsa_slave_to_port(dev);
1213         struct dsa_switch *ds = dp->ds;
1214
1215         if (!ds->ops->set_rxnfc)
1216                 return -EOPNOTSUPP;
1217
1218         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1219 }
1220
1221 static int dsa_slave_get_ts_info(struct net_device *dev,
1222                                  struct ethtool_ts_info *ts)
1223 {
1224         struct dsa_slave_priv *p = netdev_priv(dev);
1225         struct dsa_switch *ds = p->dp->ds;
1226
1227         if (!ds->ops->get_ts_info)
1228                 return -EOPNOTSUPP;
1229
1230         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1231 }
1232
1233 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1234                                      u16 vid)
1235 {
1236         struct dsa_port *dp = dsa_slave_to_port(dev);
1237         struct bridge_vlan_info info;
1238         int ret;
1239
1240         /* Check for a possible bridge VLAN entry now since there is no
1241          * need to emulate the switchdev prepare + commit phase.
1242          */
1243         if (dp->bridge_dev) {
1244                 if (!br_vlan_enabled(dp->bridge_dev))
1245                         return 0;
1246
1247                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1248                  * device, respectively the VID is not found, returning
1249                  * 0 means success, which is a failure for us here.
1250                  */
1251                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1252                 if (ret == 0)
1253                         return -EBUSY;
1254         }
1255
1256         ret = dsa_port_vid_add(dp, vid, 0);
1257         if (ret)
1258                 return ret;
1259
1260         ret = dsa_port_vid_add(dp->cpu_dp, vid, 0);
1261         if (ret)
1262                 return ret;
1263
1264         return 0;
1265 }
1266
1267 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1268                                       u16 vid)
1269 {
1270         struct dsa_port *dp = dsa_slave_to_port(dev);
1271         struct bridge_vlan_info info;
1272         int ret;
1273
1274         /* Check for a possible bridge VLAN entry now since there is no
1275          * need to emulate the switchdev prepare + commit phase.
1276          */
1277         if (dp->bridge_dev) {
1278                 if (!br_vlan_enabled(dp->bridge_dev))
1279                         return 0;
1280
1281                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1282                  * device, respectively the VID is not found, returning
1283                  * 0 means success, which is a failure for us here.
1284                  */
1285                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1286                 if (ret == 0)
1287                         return -EBUSY;
1288         }
1289
1290         /* Do not deprogram the CPU port as it may be shared with other user
1291          * ports which can be members of this VLAN as well.
1292          */
1293         return dsa_port_vid_del(dp, vid);
1294 }
1295
1296 struct dsa_hw_port {
1297         struct list_head list;
1298         struct net_device *dev;
1299         int old_mtu;
1300 };
1301
1302 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1303 {
1304         const struct dsa_hw_port *p;
1305         int err;
1306
1307         list_for_each_entry(p, hw_port_list, list) {
1308                 if (p->dev->mtu == mtu)
1309                         continue;
1310
1311                 err = dev_set_mtu(p->dev, mtu);
1312                 if (err)
1313                         goto rollback;
1314         }
1315
1316         return 0;
1317
1318 rollback:
1319         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1320                 if (p->dev->mtu == p->old_mtu)
1321                         continue;
1322
1323                 if (dev_set_mtu(p->dev, p->old_mtu))
1324                         netdev_err(p->dev, "Failed to restore MTU\n");
1325         }
1326
1327         return err;
1328 }
1329
1330 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1331 {
1332         struct dsa_hw_port *p, *n;
1333
1334         list_for_each_entry_safe(p, n, hw_port_list, list)
1335                 kfree(p);
1336 }
1337
1338 /* Make the hardware datapath to/from @dev limited to a common MTU */
1339 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1340 {
1341         struct list_head hw_port_list;
1342         struct dsa_switch_tree *dst;
1343         int min_mtu = ETH_MAX_MTU;
1344         struct dsa_port *other_dp;
1345         int err;
1346
1347         if (!dp->ds->mtu_enforcement_ingress)
1348                 return;
1349
1350         if (!dp->bridge_dev)
1351                 return;
1352
1353         INIT_LIST_HEAD(&hw_port_list);
1354
1355         /* Populate the list of ports that are part of the same bridge
1356          * as the newly added/modified port
1357          */
1358         list_for_each_entry(dst, &dsa_tree_list, list) {
1359                 list_for_each_entry(other_dp, &dst->ports, list) {
1360                         struct dsa_hw_port *hw_port;
1361                         struct net_device *slave;
1362
1363                         if (other_dp->type != DSA_PORT_TYPE_USER)
1364                                 continue;
1365
1366                         if (other_dp->bridge_dev != dp->bridge_dev)
1367                                 continue;
1368
1369                         if (!other_dp->ds->mtu_enforcement_ingress)
1370                                 continue;
1371
1372                         slave = other_dp->slave;
1373
1374                         if (min_mtu > slave->mtu)
1375                                 min_mtu = slave->mtu;
1376
1377                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1378                         if (!hw_port)
1379                                 goto out;
1380
1381                         hw_port->dev = slave;
1382                         hw_port->old_mtu = slave->mtu;
1383
1384                         list_add(&hw_port->list, &hw_port_list);
1385                 }
1386         }
1387
1388         /* Attempt to configure the entire hardware bridge to the newly added
1389          * interface's MTU first, regardless of whether the intention of the
1390          * user was to raise or lower it.
1391          */
1392         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1393         if (!err)
1394                 goto out;
1395
1396         /* Clearly that didn't work out so well, so just set the minimum MTU on
1397          * all hardware bridge ports now. If this fails too, then all ports will
1398          * still have their old MTU rolled back anyway.
1399          */
1400         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1401
1402 out:
1403         dsa_hw_port_list_free(&hw_port_list);
1404 }
1405
1406 static int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1407 {
1408         struct net_device *master = dsa_slave_to_master(dev);
1409         struct dsa_port *dp = dsa_slave_to_port(dev);
1410         struct dsa_slave_priv *p = netdev_priv(dev);
1411         struct dsa_switch *ds = p->dp->ds;
1412         struct dsa_port *cpu_dp;
1413         int port = p->dp->index;
1414         int largest_mtu = 0;
1415         int new_master_mtu;
1416         int old_master_mtu;
1417         int mtu_limit;
1418         int cpu_mtu;
1419         int err, i;
1420
1421         if (!ds->ops->port_change_mtu)
1422                 return -EOPNOTSUPP;
1423
1424         for (i = 0; i < ds->num_ports; i++) {
1425                 int slave_mtu;
1426
1427                 if (!dsa_is_user_port(ds, i))
1428                         continue;
1429
1430                 /* During probe, this function will be called for each slave
1431                  * device, while not all of them have been allocated. That's
1432                  * ok, it doesn't change what the maximum is, so ignore it.
1433                  */
1434                 if (!dsa_to_port(ds, i)->slave)
1435                         continue;
1436
1437                 /* Pretend that we already applied the setting, which we
1438                  * actually haven't (still haven't done all integrity checks)
1439                  */
1440                 if (i == port)
1441                         slave_mtu = new_mtu;
1442                 else
1443                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1444
1445                 if (largest_mtu < slave_mtu)
1446                         largest_mtu = slave_mtu;
1447         }
1448
1449         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1450
1451         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1452         old_master_mtu = master->mtu;
1453         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1454         if (new_master_mtu > mtu_limit)
1455                 return -ERANGE;
1456
1457         /* If the master MTU isn't over limit, there's no need to check the CPU
1458          * MTU, since that surely isn't either.
1459          */
1460         cpu_mtu = largest_mtu;
1461
1462         /* Start applying stuff */
1463         if (new_master_mtu != old_master_mtu) {
1464                 err = dev_set_mtu(master, new_master_mtu);
1465                 if (err < 0)
1466                         goto out_master_failed;
1467
1468                 /* We only need to propagate the MTU of the CPU port to
1469                  * upstream switches.
1470                  */
1471                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1472                 if (err)
1473                         goto out_cpu_failed;
1474         }
1475
1476         err = dsa_port_mtu_change(dp, new_mtu, false);
1477         if (err)
1478                 goto out_port_failed;
1479
1480         dev->mtu = new_mtu;
1481
1482         dsa_bridge_mtu_normalization(dp);
1483
1484         return 0;
1485
1486 out_port_failed:
1487         if (new_master_mtu != old_master_mtu)
1488                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1489                                     cpu_dp->tag_ops->overhead,
1490                                     true);
1491 out_cpu_failed:
1492         if (new_master_mtu != old_master_mtu)
1493                 dev_set_mtu(master, old_master_mtu);
1494 out_master_failed:
1495         return err;
1496 }
1497
1498 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1499         .get_drvinfo            = dsa_slave_get_drvinfo,
1500         .get_regs_len           = dsa_slave_get_regs_len,
1501         .get_regs               = dsa_slave_get_regs,
1502         .nway_reset             = dsa_slave_nway_reset,
1503         .get_link               = ethtool_op_get_link,
1504         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1505         .get_eeprom             = dsa_slave_get_eeprom,
1506         .set_eeprom             = dsa_slave_set_eeprom,
1507         .get_strings            = dsa_slave_get_strings,
1508         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1509         .get_sset_count         = dsa_slave_get_sset_count,
1510         .set_wol                = dsa_slave_set_wol,
1511         .get_wol                = dsa_slave_get_wol,
1512         .set_eee                = dsa_slave_set_eee,
1513         .get_eee                = dsa_slave_get_eee,
1514         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1515         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1516         .get_pauseparam         = dsa_slave_get_pauseparam,
1517         .set_pauseparam         = dsa_slave_set_pauseparam,
1518         .get_rxnfc              = dsa_slave_get_rxnfc,
1519         .set_rxnfc              = dsa_slave_set_rxnfc,
1520         .get_ts_info            = dsa_slave_get_ts_info,
1521 };
1522
1523 /* legacy way, bypassing the bridge *****************************************/
1524 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1525                        struct net_device *dev,
1526                        const unsigned char *addr, u16 vid,
1527                        u16 flags,
1528                        struct netlink_ext_ack *extack)
1529 {
1530         struct dsa_port *dp = dsa_slave_to_port(dev);
1531
1532         return dsa_port_fdb_add(dp, addr, vid);
1533 }
1534
1535 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1536                        struct net_device *dev,
1537                        const unsigned char *addr, u16 vid)
1538 {
1539         struct dsa_port *dp = dsa_slave_to_port(dev);
1540
1541         return dsa_port_fdb_del(dp, addr, vid);
1542 }
1543
1544 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1545 {
1546         struct dsa_port *dp = dsa_slave_to_port(dev);
1547
1548         return dp->ds->devlink ? &dp->devlink_port : NULL;
1549 }
1550
1551 static const struct net_device_ops dsa_slave_netdev_ops = {
1552         .ndo_open               = dsa_slave_open,
1553         .ndo_stop               = dsa_slave_close,
1554         .ndo_start_xmit         = dsa_slave_xmit,
1555         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1556         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1557         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1558         .ndo_fdb_add            = dsa_legacy_fdb_add,
1559         .ndo_fdb_del            = dsa_legacy_fdb_del,
1560         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1561         .ndo_do_ioctl           = dsa_slave_ioctl,
1562         .ndo_get_iflink         = dsa_slave_get_iflink,
1563 #ifdef CONFIG_NET_POLL_CONTROLLER
1564         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1565         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1566         .ndo_poll_controller    = dsa_slave_poll_controller,
1567 #endif
1568         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1569         .ndo_setup_tc           = dsa_slave_setup_tc,
1570         .ndo_get_stats64        = dsa_slave_get_stats64,
1571         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1572         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1573         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1574         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1575         .ndo_change_mtu         = dsa_slave_change_mtu,
1576 };
1577
1578 static struct device_type dsa_type = {
1579         .name   = "dsa",
1580 };
1581
1582 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1583 {
1584         const struct dsa_port *dp = dsa_to_port(ds, port);
1585
1586         if (dp->pl)
1587                 phylink_mac_change(dp->pl, up);
1588 }
1589 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1590
1591 static void dsa_slave_phylink_fixed_state(struct net_device *dev,
1592                                           struct phylink_link_state *state)
1593 {
1594         struct dsa_port *dp = dsa_slave_to_port(dev);
1595         struct dsa_switch *ds = dp->ds;
1596
1597         /* No need to check that this operation is valid, the callback would
1598          * not be called if it was not.
1599          */
1600         ds->ops->phylink_fixed_state(ds, dp->index, state);
1601 }
1602
1603 /* slave device setup *******************************************************/
1604 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1605 {
1606         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1607         struct dsa_switch *ds = dp->ds;
1608
1609         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1610         if (!slave_dev->phydev) {
1611                 netdev_err(slave_dev, "no phy at %d\n", addr);
1612                 return -ENODEV;
1613         }
1614
1615         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1616 }
1617
1618 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1619 {
1620         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1621         struct device_node *port_dn = dp->dn;
1622         struct dsa_switch *ds = dp->ds;
1623         phy_interface_t mode;
1624         u32 phy_flags = 0;
1625         int ret;
1626
1627         ret = of_get_phy_mode(port_dn, &mode);
1628         if (ret)
1629                 mode = PHY_INTERFACE_MODE_NA;
1630
1631         dp->pl_config.dev = &slave_dev->dev;
1632         dp->pl_config.type = PHYLINK_NETDEV;
1633
1634         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1635                                 &dsa_port_phylink_mac_ops);
1636         if (IS_ERR(dp->pl)) {
1637                 netdev_err(slave_dev,
1638                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1639                 return PTR_ERR(dp->pl);
1640         }
1641
1642         /* Register only if the switch provides such a callback, since this
1643          * callback takes precedence over polling the link GPIO in PHYLINK
1644          * (see phylink_get_fixed_state).
1645          */
1646         if (ds->ops->phylink_fixed_state)
1647                 phylink_fixed_state_cb(dp->pl, dsa_slave_phylink_fixed_state);
1648
1649         if (ds->ops->get_phy_flags)
1650                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1651
1652         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1653         if (ret == -ENODEV && ds->slave_mii_bus) {
1654                 /* We could not connect to a designated PHY or SFP, so try to
1655                  * use the switch internal MDIO bus instead
1656                  */
1657                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1658                 if (ret) {
1659                         netdev_err(slave_dev,
1660                                    "failed to connect to port %d: %d\n",
1661                                    dp->index, ret);
1662                         phylink_destroy(dp->pl);
1663                         return ret;
1664                 }
1665         }
1666
1667         return ret;
1668 }
1669
1670 int dsa_slave_suspend(struct net_device *slave_dev)
1671 {
1672         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1673
1674         if (!netif_running(slave_dev))
1675                 return 0;
1676
1677         netif_device_detach(slave_dev);
1678
1679         rtnl_lock();
1680         phylink_stop(dp->pl);
1681         rtnl_unlock();
1682
1683         return 0;
1684 }
1685
1686 int dsa_slave_resume(struct net_device *slave_dev)
1687 {
1688         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1689
1690         if (!netif_running(slave_dev))
1691                 return 0;
1692
1693         netif_device_attach(slave_dev);
1694
1695         rtnl_lock();
1696         phylink_start(dp->pl);
1697         rtnl_unlock();
1698
1699         return 0;
1700 }
1701
1702 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1703 {
1704         struct net_device *master = dsa_slave_to_master(dev);
1705         struct dsa_port *dp = dsa_slave_to_port(dev);
1706         struct dsa_notifier_register_info rinfo = {
1707                 .switch_number = dp->ds->index,
1708                 .port_number = dp->index,
1709                 .master = master,
1710                 .info.dev = dev,
1711         };
1712
1713         call_dsa_notifiers(val, dev, &rinfo.info);
1714 }
1715
1716 int dsa_slave_create(struct dsa_port *port)
1717 {
1718         const struct dsa_port *cpu_dp = port->cpu_dp;
1719         struct net_device *master = cpu_dp->master;
1720         struct dsa_switch *ds = port->ds;
1721         const char *name = port->name;
1722         struct net_device *slave_dev;
1723         struct dsa_slave_priv *p;
1724         int ret;
1725
1726         if (!ds->num_tx_queues)
1727                 ds->num_tx_queues = 1;
1728
1729         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1730                                      NET_NAME_UNKNOWN, ether_setup,
1731                                      ds->num_tx_queues, 1);
1732         if (slave_dev == NULL)
1733                 return -ENOMEM;
1734
1735         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1736         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1737                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1738         slave_dev->hw_features |= NETIF_F_HW_TC;
1739         slave_dev->features |= NETIF_F_LLTX;
1740         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1741         if (!IS_ERR_OR_NULL(port->mac))
1742                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1743         else
1744                 eth_hw_addr_inherit(slave_dev, master);
1745         slave_dev->priv_flags |= IFF_NO_QUEUE;
1746         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1747         slave_dev->min_mtu = 0;
1748         if (ds->ops->port_max_mtu)
1749                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1750         else
1751                 slave_dev->max_mtu = ETH_MAX_MTU;
1752         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1753
1754         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1755         slave_dev->dev.of_node = port->dn;
1756         slave_dev->vlan_features = master->vlan_features;
1757
1758         p = netdev_priv(slave_dev);
1759         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1760         if (!p->stats64) {
1761                 free_netdev(slave_dev);
1762                 return -ENOMEM;
1763         }
1764         p->dp = port;
1765         INIT_LIST_HEAD(&p->mall_tc_list);
1766         p->xmit = cpu_dp->tag_ops->xmit;
1767         port->slave = slave_dev;
1768
1769         rtnl_lock();
1770         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1771         rtnl_unlock();
1772         if (ret)
1773                 dev_warn(ds->dev, "nonfatal error %d setting MTU on port %d\n",
1774                          ret, port->index);
1775
1776         netif_carrier_off(slave_dev);
1777
1778         ret = dsa_slave_phy_setup(slave_dev);
1779         if (ret) {
1780                 netdev_err(master, "error %d setting up slave phy\n", ret);
1781                 goto out_free;
1782         }
1783
1784         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1785
1786         ret = register_netdev(slave_dev);
1787         if (ret) {
1788                 netdev_err(master, "error %d registering interface %s\n",
1789                            ret, slave_dev->name);
1790                 goto out_phy;
1791         }
1792
1793         return 0;
1794
1795 out_phy:
1796         rtnl_lock();
1797         phylink_disconnect_phy(p->dp->pl);
1798         rtnl_unlock();
1799         phylink_destroy(p->dp->pl);
1800 out_free:
1801         free_percpu(p->stats64);
1802         free_netdev(slave_dev);
1803         port->slave = NULL;
1804         return ret;
1805 }
1806
1807 void dsa_slave_destroy(struct net_device *slave_dev)
1808 {
1809         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1810         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1811
1812         netif_carrier_off(slave_dev);
1813         rtnl_lock();
1814         phylink_disconnect_phy(dp->pl);
1815         rtnl_unlock();
1816
1817         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1818         unregister_netdev(slave_dev);
1819         phylink_destroy(dp->pl);
1820         free_percpu(p->stats64);
1821         free_netdev(slave_dev);
1822 }
1823
1824 bool dsa_slave_dev_check(const struct net_device *dev)
1825 {
1826         return dev->netdev_ops == &dsa_slave_netdev_ops;
1827 }
1828
1829 static int dsa_slave_changeupper(struct net_device *dev,
1830                                  struct netdev_notifier_changeupper_info *info)
1831 {
1832         struct dsa_port *dp = dsa_slave_to_port(dev);
1833         int err = NOTIFY_DONE;
1834
1835         if (netif_is_bridge_master(info->upper_dev)) {
1836                 if (info->linking) {
1837                         err = dsa_port_bridge_join(dp, info->upper_dev);
1838                         if (!err)
1839                                 dsa_bridge_mtu_normalization(dp);
1840                         err = notifier_from_errno(err);
1841                 } else {
1842                         dsa_port_bridge_leave(dp, info->upper_dev);
1843                         err = NOTIFY_OK;
1844                 }
1845         }
1846
1847         return err;
1848 }
1849
1850 static int dsa_slave_upper_vlan_check(struct net_device *dev,
1851                                       struct netdev_notifier_changeupper_info *
1852                                       info)
1853 {
1854         struct netlink_ext_ack *ext_ack;
1855         struct net_device *slave;
1856         struct dsa_port *dp;
1857
1858         ext_ack = netdev_notifier_info_to_extack(&info->info);
1859
1860         if (!is_vlan_dev(dev))
1861                 return NOTIFY_DONE;
1862
1863         slave = vlan_dev_real_dev(dev);
1864         if (!dsa_slave_dev_check(slave))
1865                 return NOTIFY_DONE;
1866
1867         dp = dsa_slave_to_port(slave);
1868         if (!dp->bridge_dev)
1869                 return NOTIFY_DONE;
1870
1871         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1872         if (br_vlan_enabled(dp->bridge_dev) &&
1873             netif_is_bridge_master(info->upper_dev) && info->linking) {
1874                 NL_SET_ERR_MSG_MOD(ext_ack,
1875                                    "Cannot enslave VLAN device into VLAN aware bridge");
1876                 return notifier_from_errno(-EINVAL);
1877         }
1878
1879         return NOTIFY_DONE;
1880 }
1881
1882 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1883                                      unsigned long event, void *ptr)
1884 {
1885         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1886
1887         if (event == NETDEV_CHANGEUPPER) {
1888                 if (!dsa_slave_dev_check(dev))
1889                         return dsa_slave_upper_vlan_check(dev, ptr);
1890
1891                 return dsa_slave_changeupper(dev, ptr);
1892         }
1893
1894         return NOTIFY_DONE;
1895 }
1896
1897 struct dsa_switchdev_event_work {
1898         struct work_struct work;
1899         struct switchdev_notifier_fdb_info fdb_info;
1900         struct net_device *dev;
1901         unsigned long event;
1902 };
1903
1904 static void dsa_slave_switchdev_event_work(struct work_struct *work)
1905 {
1906         struct dsa_switchdev_event_work *switchdev_work =
1907                 container_of(work, struct dsa_switchdev_event_work, work);
1908         struct net_device *dev = switchdev_work->dev;
1909         struct switchdev_notifier_fdb_info *fdb_info;
1910         struct dsa_port *dp = dsa_slave_to_port(dev);
1911         int err;
1912
1913         rtnl_lock();
1914         switch (switchdev_work->event) {
1915         case SWITCHDEV_FDB_ADD_TO_DEVICE:
1916                 fdb_info = &switchdev_work->fdb_info;
1917                 if (!fdb_info->added_by_user)
1918                         break;
1919
1920                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
1921                 if (err) {
1922                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
1923                         break;
1924                 }
1925                 fdb_info->offloaded = true;
1926                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
1927                                          &fdb_info->info, NULL);
1928                 break;
1929
1930         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1931                 fdb_info = &switchdev_work->fdb_info;
1932                 if (!fdb_info->added_by_user)
1933                         break;
1934
1935                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
1936                 if (err) {
1937                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
1938                         dev_close(dev);
1939                 }
1940                 break;
1941         }
1942         rtnl_unlock();
1943
1944         kfree(switchdev_work->fdb_info.addr);
1945         kfree(switchdev_work);
1946         dev_put(dev);
1947 }
1948
1949 static int
1950 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
1951                                   switchdev_work,
1952                                   const struct switchdev_notifier_fdb_info *
1953                                   fdb_info)
1954 {
1955         memcpy(&switchdev_work->fdb_info, fdb_info,
1956                sizeof(switchdev_work->fdb_info));
1957         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
1958         if (!switchdev_work->fdb_info.addr)
1959                 return -ENOMEM;
1960         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
1961                         fdb_info->addr);
1962         return 0;
1963 }
1964
1965 /* Called under rcu_read_lock() */
1966 static int dsa_slave_switchdev_event(struct notifier_block *unused,
1967                                      unsigned long event, void *ptr)
1968 {
1969         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1970         struct dsa_switchdev_event_work *switchdev_work;
1971         int err;
1972
1973         if (event == SWITCHDEV_PORT_ATTR_SET) {
1974                 err = switchdev_handle_port_attr_set(dev, ptr,
1975                                                      dsa_slave_dev_check,
1976                                                      dsa_slave_port_attr_set);
1977                 return notifier_from_errno(err);
1978         }
1979
1980         if (!dsa_slave_dev_check(dev))
1981                 return NOTIFY_DONE;
1982
1983         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
1984         if (!switchdev_work)
1985                 return NOTIFY_BAD;
1986
1987         INIT_WORK(&switchdev_work->work,
1988                   dsa_slave_switchdev_event_work);
1989         switchdev_work->dev = dev;
1990         switchdev_work->event = event;
1991
1992         switch (event) {
1993         case SWITCHDEV_FDB_ADD_TO_DEVICE: /* fall through */
1994         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1995                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
1996                         goto err_fdb_work_init;
1997                 dev_hold(dev);
1998                 break;
1999         default:
2000                 kfree(switchdev_work);
2001                 return NOTIFY_DONE;
2002         }
2003
2004         dsa_schedule_work(&switchdev_work->work);
2005         return NOTIFY_OK;
2006
2007 err_fdb_work_init:
2008         kfree(switchdev_work);
2009         return NOTIFY_BAD;
2010 }
2011
2012 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2013                                               unsigned long event, void *ptr)
2014 {
2015         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2016         int err;
2017
2018         switch (event) {
2019         case SWITCHDEV_PORT_OBJ_ADD:
2020                 err = switchdev_handle_port_obj_add(dev, ptr,
2021                                                     dsa_slave_dev_check,
2022                                                     dsa_slave_port_obj_add);
2023                 return notifier_from_errno(err);
2024         case SWITCHDEV_PORT_OBJ_DEL:
2025                 err = switchdev_handle_port_obj_del(dev, ptr,
2026                                                     dsa_slave_dev_check,
2027                                                     dsa_slave_port_obj_del);
2028                 return notifier_from_errno(err);
2029         case SWITCHDEV_PORT_ATTR_SET:
2030                 err = switchdev_handle_port_attr_set(dev, ptr,
2031                                                      dsa_slave_dev_check,
2032                                                      dsa_slave_port_attr_set);
2033                 return notifier_from_errno(err);
2034         }
2035
2036         return NOTIFY_DONE;
2037 }
2038
2039 static struct notifier_block dsa_slave_nb __read_mostly = {
2040         .notifier_call  = dsa_slave_netdevice_event,
2041 };
2042
2043 static struct notifier_block dsa_slave_switchdev_notifier = {
2044         .notifier_call = dsa_slave_switchdev_event,
2045 };
2046
2047 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2048         .notifier_call = dsa_slave_switchdev_blocking_event,
2049 };
2050
2051 int dsa_slave_register_notifier(void)
2052 {
2053         struct notifier_block *nb;
2054         int err;
2055
2056         err = register_netdevice_notifier(&dsa_slave_nb);
2057         if (err)
2058                 return err;
2059
2060         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2061         if (err)
2062                 goto err_switchdev_nb;
2063
2064         nb = &dsa_slave_switchdev_blocking_notifier;
2065         err = register_switchdev_blocking_notifier(nb);
2066         if (err)
2067                 goto err_switchdev_blocking_nb;
2068
2069         return 0;
2070
2071 err_switchdev_blocking_nb:
2072         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2073 err_switchdev_nb:
2074         unregister_netdevice_notifier(&dsa_slave_nb);
2075         return err;
2076 }
2077
2078 void dsa_slave_unregister_notifier(void)
2079 {
2080         struct notifier_block *nb;
2081         int err;
2082
2083         nb = &dsa_slave_switchdev_blocking_notifier;
2084         err = unregister_switchdev_blocking_notifier(nb);
2085         if (err)
2086                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2087
2088         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2089         if (err)
2090                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2091
2092         err = unregister_netdevice_notifier(&dsa_slave_nb);
2093         if (err)
2094                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2095 }