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 static bool dsa_slave_dev_check(struct net_device *dev);
  26
  27 /* slave mii_bus handling ***************************************************/
  28 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  29 {
  30         struct dsa_switch *ds = bus->priv;
  31
  32         if (ds->phys_mii_mask & (1 << addr))
  33                 return ds->ops->phy_read(ds, addr, reg);
  34
  35         return 0xffff;
  36 }
  37
  38 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  39 {
  40         struct dsa_switch *ds = bus->priv;
  41
  42         if (ds->phys_mii_mask & (1 << addr))
  43                 return ds->ops->phy_write(ds, addr, reg, val);
  44
  45         return 0;
  46 }
  47
  48 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  49 {
  50         ds->slave_mii_bus->priv = (void *)ds;
  51         ds->slave_mii_bus->name = "dsa slave smi";
  52         ds->slave_mii_bus->read = dsa_slave_phy_read;
  53         ds->slave_mii_bus->write = dsa_slave_phy_write;
  54         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  55                  ds->dst->index, ds->index);
  56         ds->slave_mii_bus->parent = ds->dev;
  57         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  58 }
  59
  60
  61 /* slave device handling ****************************************************/
  62 static int dsa_slave_get_iflink(const struct net_device *dev)
  63 {
  64         return dsa_slave_to_master(dev)->ifindex;
  65 }
  66
  67 static int dsa_slave_open(struct net_device *dev)
  68 {
  69         struct net_device *master = dsa_slave_to_master(dev);
  70         struct dsa_port *dp = dsa_slave_to_port(dev);
  71         int err;
  72
  73         if (!(master->flags & IFF_UP))
  74                 return -ENETDOWN;
  75
  76         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  77                 err = dev_uc_add(master, dev->dev_addr);
  78                 if (err < 0)
  79                         goto out;
  80         }
  81
  82         if (dev->flags & IFF_ALLMULTI) {
  83                 err = dev_set_allmulti(master, 1);
  84                 if (err < 0)
  85                         goto del_unicast;
  86         }
  87         if (dev->flags & IFF_PROMISC) {
  88                 err = dev_set_promiscuity(master, 1);
  89                 if (err < 0)
  90                         goto clear_allmulti;
  91         }
  92
  93         err = dsa_port_enable(dp, dev->phydev);
  94         if (err)
  95                 goto clear_promisc;
  96
  97         phylink_start(dp->pl);
  98
  99         return 0;
 100
 101 clear_promisc:
 102         if (dev->flags & IFF_PROMISC)
 103                 dev_set_promiscuity(master, -1);
 104 clear_allmulti:
 105         if (dev->flags & IFF_ALLMULTI)
 106                 dev_set_allmulti(master, -1);
 107 del_unicast:
 108         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 109                 dev_uc_del(master, dev->dev_addr);
 110 out:
 111         return err;
 112 }
 113
 114 static int dsa_slave_close(struct net_device *dev)
 115 {
 116         struct net_device *master = dsa_slave_to_master(dev);
 117         struct dsa_port *dp = dsa_slave_to_port(dev);
 118
 119         cancel_work_sync(&dp->xmit_work);
 120         skb_queue_purge(&dp->xmit_queue);
 121
 122         phylink_stop(dp->pl);
 123
 124         dsa_port_disable(dp);
 125
 126         dev_mc_unsync(master, dev);
 127         dev_uc_unsync(master, dev);
 128         if (dev->flags & IFF_ALLMULTI)
 129                 dev_set_allmulti(master, -1);
 130         if (dev->flags & IFF_PROMISC)
 131                 dev_set_promiscuity(master, -1);
 132
 133         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 134                 dev_uc_del(master, dev->dev_addr);
 135
 136         return 0;
 137 }
 138
 139 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 140 {
 141         struct net_device *master = dsa_slave_to_master(dev);
 142         if (dev->flags & IFF_UP) {
 143                 if (change & IFF_ALLMULTI)
 144                         dev_set_allmulti(master,
 145                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 146                 if (change & IFF_PROMISC)
 147                         dev_set_promiscuity(master,
 148                                             dev->flags & IFF_PROMISC ? 1 : -1);
 149         }
 150 }
 151
 152 static void dsa_slave_set_rx_mode(struct net_device *dev)
 153 {
 154         struct net_device *master = dsa_slave_to_master(dev);
 155
 156         dev_mc_sync(master, dev);
 157         dev_uc_sync(master, dev);
 158 }
 159
 160 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 161 {
 162         struct net_device *master = dsa_slave_to_master(dev);
 163         struct sockaddr *addr = a;
 164         int err;
 165
 166         if (!is_valid_ether_addr(addr->sa_data))
 167                 return -EADDRNOTAVAIL;
 168
 169         if (!(dev->flags & IFF_UP))
 170                 goto out;
 171
 172         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 173                 err = dev_uc_add(master, addr->sa_data);
 174                 if (err < 0)
 175                         return err;
 176         }
 177
 178         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 179                 dev_uc_del(master, dev->dev_addr);
 180
 181 out:
 182         ether_addr_copy(dev->dev_addr, addr->sa_data);
 183
 184         return 0;
 185 }
 186
 187 struct dsa_slave_dump_ctx {
 188         struct net_device *dev;
 189         struct sk_buff *skb;
 190         struct netlink_callback *cb;
 191         int idx;
 192 };
 193
 194 static int
 195 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 196                            bool is_static, void *data)
 197 {
 198         struct dsa_slave_dump_ctx *dump = data;
 199         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 200         u32 seq = dump->cb->nlh->nlmsg_seq;
 201         struct nlmsghdr *nlh;
 202         struct ndmsg *ndm;
 203
 204         if (dump->idx < dump->cb->args[2])
 205                 goto skip;
 206
 207         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 208                         sizeof(*ndm), NLM_F_MULTI);
 209         if (!nlh)
 210                 return -EMSGSIZE;
 211
 212         ndm = nlmsg_data(nlh);
 213         ndm->ndm_family  = AF_BRIDGE;
 214         ndm->ndm_pad1    = 0;
 215         ndm->ndm_pad2    = 0;
 216         ndm->ndm_flags   = NTF_SELF;
 217         ndm->ndm_type    = 0;
 218         ndm->ndm_ifindex = dump->dev->ifindex;
 219         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 220
 221         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 222                 goto nla_put_failure;
 223
 224         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 225                 goto nla_put_failure;
 226
 227         nlmsg_end(dump->skb, nlh);
 228
 229 skip:
 230         dump->idx++;
 231         return 0;
 232
 233 nla_put_failure:
 234         nlmsg_cancel(dump->skb, nlh);
 235         return -EMSGSIZE;
 236 }
 237
 238 static int
 239 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 240                    struct net_device *dev, struct net_device *filter_dev,
 241                    int *idx)
 242 {
 243         struct dsa_port *dp = dsa_slave_to_port(dev);
 244         struct dsa_slave_dump_ctx dump = {
 245                 .dev = dev,
 246                 .skb = skb,
 247                 .cb = cb,
 248                 .idx = *idx,
 249         };
 250         int err;
 251
 252         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 253         *idx = dump.idx;
 254
 255         return err;
 256 }
 257
 258 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 259 {
 260         struct dsa_slave_priv *p = netdev_priv(dev);
 261         struct dsa_switch *ds = p->dp->ds;
 262         int port = p->dp->index;
 263
 264         /* Pass through to switch driver if it supports timestamping */
 265         switch (cmd) {
 266         case SIOCGHWTSTAMP:
 267                 if (ds->ops->port_hwtstamp_get)
 268                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 269                 break;
 270         case SIOCSHWTSTAMP:
 271                 if (ds->ops->port_hwtstamp_set)
 272                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 273                 break;
 274         }
 275
 276         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 277 }
 278
 279 static int dsa_slave_port_attr_set(struct net_device *dev,
 280                                    const struct switchdev_attr *attr,
 281                                    struct switchdev_trans *trans)
 282 {
 283         struct dsa_port *dp = dsa_slave_to_port(dev);
 284         int ret;
 285
 286         switch (attr->id) {
 287         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 288                 ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
 289                 break;
 290         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 291                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 292                                               trans);
 293                 break;
 294         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 295                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
 296                 break;
 297         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 298                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 299                                                 trans);
 300                 break;
 301         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 302                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans);
 303                 break;
 304         default:
 305                 ret = -EOPNOTSUPP;
 306                 break;
 307         }
 308
 309         return ret;
 310 }
 311
 312 static int dsa_slave_port_obj_add(struct net_device *dev,
 313                                   const struct switchdev_obj *obj,
 314                                   struct switchdev_trans *trans)
 315 {
 316         struct dsa_port *dp = dsa_slave_to_port(dev);
 317         int err;
 318
 319         /* For the prepare phase, ensure the full set of changes is feasable in
 320          * one go in order to signal a failure properly. If an operation is not
 321          * supported, return -EOPNOTSUPP.
 322          */
 323
 324         switch (obj->id) {
 325         case SWITCHDEV_OBJ_ID_PORT_MDB:
 326                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 327                 break;
 328         case SWITCHDEV_OBJ_ID_HOST_MDB:
 329                 /* DSA can directly translate this to a normal MDB add,
 330                  * but on the CPU port.
 331                  */
 332                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj),
 333                                        trans);
 334                 break;
 335         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 336                 err = dsa_port_vlan_add(dp, SWITCHDEV_OBJ_PORT_VLAN(obj),
 337                                         trans);
 338                 break;
 339         default:
 340                 err = -EOPNOTSUPP;
 341                 break;
 342         }
 343
 344         return err;
 345 }
 346
 347 static int dsa_slave_port_obj_del(struct net_device *dev,
 348                                   const struct switchdev_obj *obj)
 349 {
 350         struct dsa_port *dp = dsa_slave_to_port(dev);
 351         int err;
 352
 353         switch (obj->id) {
 354         case SWITCHDEV_OBJ_ID_PORT_MDB:
 355                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 356                 break;
 357         case SWITCHDEV_OBJ_ID_HOST_MDB:
 358                 /* DSA can directly translate this to a normal MDB add,
 359                  * but on the CPU port.
 360                  */
 361                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 362                 break;
 363         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 364                 err = dsa_port_vlan_del(dp, SWITCHDEV_OBJ_PORT_VLAN(obj));
 365                 break;
 366         default:
 367                 err = -EOPNOTSUPP;
 368                 break;
 369         }
 370
 371         return err;
 372 }
 373
 374 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 375                                         struct netdev_phys_item_id *ppid)
 376 {
 377         struct dsa_port *dp = dsa_slave_to_port(dev);
 378         struct dsa_switch *ds = dp->ds;
 379         struct dsa_switch_tree *dst = ds->dst;
 380
 381         /* For non-legacy ports, devlink is used and it takes
 382          * care of the name generation. This ndo implementation
 383          * should be removed with legacy support.
 384          */
 385         if (dp->ds->devlink)
 386                 return -EOPNOTSUPP;
 387
 388         ppid->id_len = sizeof(dst->index);
 389         memcpy(&ppid->id, &dst->index, ppid->id_len);
 390
 391         return 0;
 392 }
 393
 394 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 395                                                      struct sk_buff *skb)
 396 {
 397 #ifdef CONFIG_NET_POLL_CONTROLLER
 398         struct dsa_slave_priv *p = netdev_priv(dev);
 399
 400         if (p->netpoll)
 401                 netpoll_send_skb(p->netpoll, skb);
 402 #else
 403         BUG();
 404 #endif
 405         return NETDEV_TX_OK;
 406 }
 407
 408 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 409                                  struct sk_buff *skb)
 410 {
 411         struct dsa_switch *ds = p->dp->ds;
 412         struct sk_buff *clone;
 413         unsigned int type;
 414
 415         type = ptp_classify_raw(skb);
 416         if (type == PTP_CLASS_NONE)
 417                 return;
 418
 419         if (!ds->ops->port_txtstamp)
 420                 return;
 421
 422         clone = skb_clone_sk(skb);
 423         if (!clone)
 424                 return;
 425
 426         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type))
 427                 return;
 428
 429         kfree_skb(clone);
 430 }
 431
 432 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 433 {
 434         /* SKB for netpoll still need to be mangled with the protocol-specific
 435          * tag to be successfully transmitted
 436          */
 437         if (unlikely(netpoll_tx_running(dev)))
 438                 return dsa_slave_netpoll_send_skb(dev, skb);
 439
 440         /* Queue the SKB for transmission on the parent interface, but
 441          * do not modify its EtherType
 442          */
 443         skb->dev = dsa_slave_to_master(dev);
 444         dev_queue_xmit(skb);
 445
 446         return NETDEV_TX_OK;
 447 }
 448 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 449
 450 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 451 {
 452         struct dsa_slave_priv *p = netdev_priv(dev);
 453         struct pcpu_sw_netstats *s;
 454         struct sk_buff *nskb;
 455
 456         s = this_cpu_ptr(p->stats64);
 457         u64_stats_update_begin(&s->syncp);
 458         s->tx_packets++;
 459         s->tx_bytes += skb->len;
 460         u64_stats_update_end(&s->syncp);
 461
 462         DSA_SKB_CB(skb)->deferred_xmit = false;
 463
 464         /* Identify PTP protocol packets, clone them, and pass them to the
 465          * switch driver
 466          */
 467         dsa_skb_tx_timestamp(p, skb);
 468
 469         /* Transmit function may have to reallocate the original SKB,
 470          * in which case it must have freed it. Only free it here on error.
 471          */
 472         nskb = p->xmit(skb, dev);
 473         if (!nskb) {
 474                 if (!DSA_SKB_CB(skb)->deferred_xmit)
 475                         kfree_skb(skb);
 476                 return NETDEV_TX_OK;
 477         }
 478
 479         return dsa_enqueue_skb(nskb, dev);
 480 }
 481
 482 void *dsa_defer_xmit(struct sk_buff *skb, struct net_device *dev)
 483 {
 484         struct dsa_port *dp = dsa_slave_to_port(dev);
 485
 486         DSA_SKB_CB(skb)->deferred_xmit = true;
 487
 488         skb_queue_tail(&dp->xmit_queue, skb);
 489         schedule_work(&dp->xmit_work);
 490         return NULL;
 491 }
 492 EXPORT_SYMBOL_GPL(dsa_defer_xmit);
 493
 494 static void dsa_port_xmit_work(struct work_struct *work)
 495 {
 496         struct dsa_port *dp = container_of(work, struct dsa_port, xmit_work);
 497         struct dsa_switch *ds = dp->ds;
 498         struct sk_buff *skb;
 499
 500         if (unlikely(!ds->ops->port_deferred_xmit))
 501                 return;
 502
 503         while ((skb = skb_dequeue(&dp->xmit_queue)) != NULL)
 504                 ds->ops->port_deferred_xmit(ds, dp->index, skb);
 505 }
 506
 507 /* ethtool operations *******************************************************/
 508
 509 static void dsa_slave_get_drvinfo(struct net_device *dev,
 510                                   struct ethtool_drvinfo *drvinfo)
 511 {
 512         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 513         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 514         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 515 }
 516
 517 static int dsa_slave_get_regs_len(struct net_device *dev)
 518 {
 519         struct dsa_port *dp = dsa_slave_to_port(dev);
 520         struct dsa_switch *ds = dp->ds;
 521
 522         if (ds->ops->get_regs_len)
 523                 return ds->ops->get_regs_len(ds, dp->index);
 524
 525         return -EOPNOTSUPP;
 526 }
 527
 528 static void
 529 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 530 {
 531         struct dsa_port *dp = dsa_slave_to_port(dev);
 532         struct dsa_switch *ds = dp->ds;
 533
 534         if (ds->ops->get_regs)
 535                 ds->ops->get_regs(ds, dp->index, regs, _p);
 536 }
 537
 538 static int dsa_slave_nway_reset(struct net_device *dev)
 539 {
 540         struct dsa_port *dp = dsa_slave_to_port(dev);
 541
 542         return phylink_ethtool_nway_reset(dp->pl);
 543 }
 544
 545 static int dsa_slave_get_eeprom_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->cd && ds->cd->eeprom_len)
 551                 return ds->cd->eeprom_len;
 552
 553         if (ds->ops->get_eeprom_len)
 554                 return ds->ops->get_eeprom_len(ds);
 555
 556         return 0;
 557 }
 558
 559 static int dsa_slave_get_eeprom(struct net_device *dev,
 560                                 struct ethtool_eeprom *eeprom, u8 *data)
 561 {
 562         struct dsa_port *dp = dsa_slave_to_port(dev);
 563         struct dsa_switch *ds = dp->ds;
 564
 565         if (ds->ops->get_eeprom)
 566                 return ds->ops->get_eeprom(ds, eeprom, data);
 567
 568         return -EOPNOTSUPP;
 569 }
 570
 571 static int dsa_slave_set_eeprom(struct net_device *dev,
 572                                 struct ethtool_eeprom *eeprom, u8 *data)
 573 {
 574         struct dsa_port *dp = dsa_slave_to_port(dev);
 575         struct dsa_switch *ds = dp->ds;
 576
 577         if (ds->ops->set_eeprom)
 578                 return ds->ops->set_eeprom(ds, eeprom, data);
 579
 580         return -EOPNOTSUPP;
 581 }
 582
 583 static void dsa_slave_get_strings(struct net_device *dev,
 584                                   uint32_t stringset, uint8_t *data)
 585 {
 586         struct dsa_port *dp = dsa_slave_to_port(dev);
 587         struct dsa_switch *ds = dp->ds;
 588
 589         if (stringset == ETH_SS_STATS) {
 590                 int len = ETH_GSTRING_LEN;
 591
 592                 strncpy(data, "tx_packets", len);
 593                 strncpy(data + len, "tx_bytes", len);
 594                 strncpy(data + 2 * len, "rx_packets", len);
 595                 strncpy(data + 3 * len, "rx_bytes", len);
 596                 if (ds->ops->get_strings)
 597                         ds->ops->get_strings(ds, dp->index, stringset,
 598                                              data + 4 * len);
 599         }
 600 }
 601
 602 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 603                                         struct ethtool_stats *stats,
 604                                         uint64_t *data)
 605 {
 606         struct dsa_port *dp = dsa_slave_to_port(dev);
 607         struct dsa_slave_priv *p = netdev_priv(dev);
 608         struct dsa_switch *ds = dp->ds;
 609         struct pcpu_sw_netstats *s;
 610         unsigned int start;
 611         int i;
 612
 613         for_each_possible_cpu(i) {
 614                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 615
 616                 s = per_cpu_ptr(p->stats64, i);
 617                 do {
 618                         start = u64_stats_fetch_begin_irq(&s->syncp);
 619                         tx_packets = s->tx_packets;
 620                         tx_bytes = s->tx_bytes;
 621                         rx_packets = s->rx_packets;
 622                         rx_bytes = s->rx_bytes;
 623                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 624                 data[0] += tx_packets;
 625                 data[1] += tx_bytes;
 626                 data[2] += rx_packets;
 627                 data[3] += rx_bytes;
 628         }
 629         if (ds->ops->get_ethtool_stats)
 630                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 631 }
 632
 633 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 634 {
 635         struct dsa_port *dp = dsa_slave_to_port(dev);
 636         struct dsa_switch *ds = dp->ds;
 637
 638         if (sset == ETH_SS_STATS) {
 639                 int count;
 640
 641                 count = 4;
 642                 if (ds->ops->get_sset_count)
 643                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 644
 645                 return count;
 646         }
 647
 648         return -EOPNOTSUPP;
 649 }
 650
 651 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 652 {
 653         struct dsa_port *dp = dsa_slave_to_port(dev);
 654         struct dsa_switch *ds = dp->ds;
 655
 656         phylink_ethtool_get_wol(dp->pl, w);
 657
 658         if (ds->ops->get_wol)
 659                 ds->ops->get_wol(ds, dp->index, w);
 660 }
 661
 662 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 663 {
 664         struct dsa_port *dp = dsa_slave_to_port(dev);
 665         struct dsa_switch *ds = dp->ds;
 666         int ret = -EOPNOTSUPP;
 667
 668         phylink_ethtool_set_wol(dp->pl, w);
 669
 670         if (ds->ops->set_wol)
 671                 ret = ds->ops->set_wol(ds, dp->index, w);
 672
 673         return ret;
 674 }
 675
 676 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 677 {
 678         struct dsa_port *dp = dsa_slave_to_port(dev);
 679         struct dsa_switch *ds = dp->ds;
 680         int ret;
 681
 682         /* Port's PHY and MAC both need to be EEE capable */
 683         if (!dev->phydev || !dp->pl)
 684                 return -ENODEV;
 685
 686         if (!ds->ops->set_mac_eee)
 687                 return -EOPNOTSUPP;
 688
 689         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 690         if (ret)
 691                 return ret;
 692
 693         return phylink_ethtool_set_eee(dp->pl, e);
 694 }
 695
 696 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 697 {
 698         struct dsa_port *dp = dsa_slave_to_port(dev);
 699         struct dsa_switch *ds = dp->ds;
 700         int ret;
 701
 702         /* Port's PHY and MAC both need to be EEE capable */
 703         if (!dev->phydev || !dp->pl)
 704                 return -ENODEV;
 705
 706         if (!ds->ops->get_mac_eee)
 707                 return -EOPNOTSUPP;
 708
 709         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 710         if (ret)
 711                 return ret;
 712
 713         return phylink_ethtool_get_eee(dp->pl, e);
 714 }
 715
 716 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 717                                         struct ethtool_link_ksettings *cmd)
 718 {
 719         struct dsa_port *dp = dsa_slave_to_port(dev);
 720
 721         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 722 }
 723
 724 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 725                                         const struct ethtool_link_ksettings *cmd)
 726 {
 727         struct dsa_port *dp = dsa_slave_to_port(dev);
 728
 729         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 730 }
 731
 732 #ifdef CONFIG_NET_POLL_CONTROLLER
 733 static int dsa_slave_netpoll_setup(struct net_device *dev,
 734                                    struct netpoll_info *ni)
 735 {
 736         struct net_device *master = dsa_slave_to_master(dev);
 737         struct dsa_slave_priv *p = netdev_priv(dev);
 738         struct netpoll *netpoll;
 739         int err = 0;
 740
 741         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 742         if (!netpoll)
 743                 return -ENOMEM;
 744
 745         err = __netpoll_setup(netpoll, master);
 746         if (err) {
 747                 kfree(netpoll);
 748                 goto out;
 749         }
 750
 751         p->netpoll = netpoll;
 752 out:
 753         return err;
 754 }
 755
 756 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 757 {
 758         struct dsa_slave_priv *p = netdev_priv(dev);
 759         struct netpoll *netpoll = p->netpoll;
 760
 761         if (!netpoll)
 762                 return;
 763
 764         p->netpoll = NULL;
 765
 766         __netpoll_free(netpoll);
 767 }
 768
 769 static void dsa_slave_poll_controller(struct net_device *dev)
 770 {
 771 }
 772 #endif
 773
 774 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 775                                         char *name, size_t len)
 776 {
 777         struct dsa_port *dp = dsa_slave_to_port(dev);
 778
 779         /* For non-legacy ports, devlink is used and it takes
 780          * care of the name generation. This ndo implementation
 781          * should be removed with legacy support.
 782          */
 783         if (dp->ds->devlink)
 784                 return -EOPNOTSUPP;
 785
 786         if (snprintf(name, len, "p%d", dp->index) >= len)
 787                 return -EINVAL;
 788
 789         return 0;
 790 }
 791
 792 static struct dsa_mall_tc_entry *
 793 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 794 {
 795         struct dsa_slave_priv *p = netdev_priv(dev);
 796         struct dsa_mall_tc_entry *mall_tc_entry;
 797
 798         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 799                 if (mall_tc_entry->cookie == cookie)
 800                         return mall_tc_entry;
 801
 802         return NULL;
 803 }
 804
 805 static int dsa_slave_add_cls_matchall(struct net_device *dev,
 806                                       struct tc_cls_matchall_offload *cls,
 807                                       bool ingress)
 808 {
 809         struct dsa_port *dp = dsa_slave_to_port(dev);
 810         struct dsa_slave_priv *p = netdev_priv(dev);
 811         struct dsa_mall_tc_entry *mall_tc_entry;
 812         __be16 protocol = cls->common.protocol;
 813         struct dsa_switch *ds = dp->ds;
 814         struct flow_action_entry *act;
 815         struct dsa_port *to_dp;
 816         int err = -EOPNOTSUPP;
 817
 818         if (!ds->ops->port_mirror_add)
 819                 return err;
 820
 821         if (!flow_offload_has_one_action(&cls->rule->action))
 822                 return err;
 823
 824         act = &cls->rule->action.entries[0];
 825
 826         if (act->id == FLOW_ACTION_MIRRED && protocol == htons(ETH_P_ALL)) {
 827                 struct dsa_mall_mirror_tc_entry *mirror;
 828
 829                 if (!act->dev)
 830                         return -EINVAL;
 831
 832                 if (!dsa_slave_dev_check(act->dev))
 833                         return -EOPNOTSUPP;
 834
 835                 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 836                 if (!mall_tc_entry)
 837                         return -ENOMEM;
 838
 839                 mall_tc_entry->cookie = cls->cookie;
 840                 mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 841                 mirror = &mall_tc_entry->mirror;
 842
 843                 to_dp = dsa_slave_to_port(act->dev);
 844
 845                 mirror->to_local_port = to_dp->index;
 846                 mirror->ingress = ingress;
 847
 848                 err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 849                 if (err) {
 850                         kfree(mall_tc_entry);
 851                         return err;
 852                 }
 853
 854                 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 855         }
 856
 857         return 0;
 858 }
 859
 860 static void dsa_slave_del_cls_matchall(struct net_device *dev,
 861                                        struct tc_cls_matchall_offload *cls)
 862 {
 863         struct dsa_port *dp = dsa_slave_to_port(dev);
 864         struct dsa_mall_tc_entry *mall_tc_entry;
 865         struct dsa_switch *ds = dp->ds;
 866
 867         if (!ds->ops->port_mirror_del)
 868                 return;
 869
 870         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
 871         if (!mall_tc_entry)
 872                 return;
 873
 874         list_del(&mall_tc_entry->list);
 875
 876         switch (mall_tc_entry->type) {
 877         case DSA_PORT_MALL_MIRROR:
 878                 ds->ops->port_mirror_del(ds, dp->index, &mall_tc_entry->mirror);
 879                 break;
 880         default:
 881                 WARN_ON(1);
 882         }
 883
 884         kfree(mall_tc_entry);
 885 }
 886
 887 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
 888                                            struct tc_cls_matchall_offload *cls,
 889                                            bool ingress)
 890 {
 891         if (cls->common.chain_index)
 892                 return -EOPNOTSUPP;
 893
 894         switch (cls->command) {
 895         case TC_CLSMATCHALL_REPLACE:
 896                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
 897         case TC_CLSMATCHALL_DESTROY:
 898                 dsa_slave_del_cls_matchall(dev, cls);
 899                 return 0;
 900         default:
 901                 return -EOPNOTSUPP;
 902         }
 903 }
 904
 905 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
 906                                        void *cb_priv, bool ingress)
 907 {
 908         struct net_device *dev = cb_priv;
 909
 910         if (!tc_can_offload(dev))
 911                 return -EOPNOTSUPP;
 912
 913         switch (type) {
 914         case TC_SETUP_CLSMATCHALL:
 915                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
 916         default:
 917                 return -EOPNOTSUPP;
 918         }
 919 }
 920
 921 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
 922                                           void *type_data, void *cb_priv)
 923 {
 924         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
 925 }
 926
 927 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
 928                                           void *type_data, void *cb_priv)
 929 {
 930         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
 931 }
 932
 933 static int dsa_slave_setup_tc_block(struct net_device *dev,
 934                                     struct tc_block_offload *f)
 935 {
 936         tc_setup_cb_t *cb;
 937
 938         if (f->binder_type == TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 939                 cb = dsa_slave_setup_tc_block_cb_ig;
 940         else if (f->binder_type == TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
 941                 cb = dsa_slave_setup_tc_block_cb_eg;
 942         else
 943                 return -EOPNOTSUPP;
 944
 945         switch (f->command) {
 946         case TC_BLOCK_BIND:
 947                 return tcf_block_cb_register(f->block, cb, dev, dev, f->extack);
 948         case TC_BLOCK_UNBIND:
 949                 tcf_block_cb_unregister(f->block, cb, dev);
 950                 return 0;
 951         default:
 952                 return -EOPNOTSUPP;
 953         }
 954 }
 955
 956 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
 957                               void *type_data)
 958 {
 959         switch (type) {
 960         case TC_SETUP_BLOCK:
 961                 return dsa_slave_setup_tc_block(dev, type_data);
 962         default:
 963                 return -EOPNOTSUPP;
 964         }
 965 }
 966
 967 static void dsa_slave_get_stats64(struct net_device *dev,
 968                                   struct rtnl_link_stats64 *stats)
 969 {
 970         struct dsa_slave_priv *p = netdev_priv(dev);
 971         struct pcpu_sw_netstats *s;
 972         unsigned int start;
 973         int i;
 974
 975         netdev_stats_to_stats64(stats, &dev->stats);
 976         for_each_possible_cpu(i) {
 977                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 978
 979                 s = per_cpu_ptr(p->stats64, i);
 980                 do {
 981                         start = u64_stats_fetch_begin_irq(&s->syncp);
 982                         tx_packets = s->tx_packets;
 983                         tx_bytes = s->tx_bytes;
 984                         rx_packets = s->rx_packets;
 985                         rx_bytes = s->rx_bytes;
 986                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 987
 988                 stats->tx_packets += tx_packets;
 989                 stats->tx_bytes += tx_bytes;
 990                 stats->rx_packets += rx_packets;
 991                 stats->rx_bytes += rx_bytes;
 992         }
 993 }
 994
 995 static int dsa_slave_get_rxnfc(struct net_device *dev,
 996                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
 997 {
 998         struct dsa_port *dp = dsa_slave_to_port(dev);
 999         struct dsa_switch *ds = dp->ds;
1000
1001         if (!ds->ops->get_rxnfc)
1002                 return -EOPNOTSUPP;
1003
1004         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1005 }
1006
1007 static int dsa_slave_set_rxnfc(struct net_device *dev,
1008                                struct ethtool_rxnfc *nfc)
1009 {
1010         struct dsa_port *dp = dsa_slave_to_port(dev);
1011         struct dsa_switch *ds = dp->ds;
1012
1013         if (!ds->ops->set_rxnfc)
1014                 return -EOPNOTSUPP;
1015
1016         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1017 }
1018
1019 static int dsa_slave_get_ts_info(struct net_device *dev,
1020                                  struct ethtool_ts_info *ts)
1021 {
1022         struct dsa_slave_priv *p = netdev_priv(dev);
1023         struct dsa_switch *ds = p->dp->ds;
1024
1025         if (!ds->ops->get_ts_info)
1026                 return -EOPNOTSUPP;
1027
1028         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1029 }
1030
1031 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1032                                      u16 vid)
1033 {
1034         struct dsa_port *dp = dsa_slave_to_port(dev);
1035         struct bridge_vlan_info info;
1036         int ret;
1037
1038         /* Check for a possible bridge VLAN entry now since there is no
1039          * need to emulate the switchdev prepare + commit phase.
1040          */
1041         if (dp->bridge_dev) {
1042                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1043                  * device, respectively the VID is not found, returning
1044                  * 0 means success, which is a failure for us here.
1045                  */
1046                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1047                 if (ret == 0)
1048                         return -EBUSY;
1049         }
1050
1051         /* This API only allows programming tagged, non-PVID VIDs */
1052         return dsa_port_vid_add(dp, vid, 0);
1053 }
1054
1055 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1056                                       u16 vid)
1057 {
1058         struct dsa_port *dp = dsa_slave_to_port(dev);
1059         struct bridge_vlan_info info;
1060         int ret;
1061
1062         /* Check for a possible bridge VLAN entry now since there is no
1063          * need to emulate the switchdev prepare + commit phase.
1064          */
1065         if (dp->bridge_dev) {
1066                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1067                  * device, respectively the VID is not found, returning
1068                  * 0 means success, which is a failure for us here.
1069                  */
1070                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1071                 if (ret == 0)
1072                         return -EBUSY;
1073         }
1074
1075         ret = dsa_port_vid_del(dp, vid);
1076         if (ret == -EOPNOTSUPP)
1077                 ret = 0;
1078
1079         return ret;
1080 }
1081
1082 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1083         .get_drvinfo            = dsa_slave_get_drvinfo,
1084         .get_regs_len           = dsa_slave_get_regs_len,
1085         .get_regs               = dsa_slave_get_regs,
1086         .nway_reset             = dsa_slave_nway_reset,
1087         .get_link               = ethtool_op_get_link,
1088         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1089         .get_eeprom             = dsa_slave_get_eeprom,
1090         .set_eeprom             = dsa_slave_set_eeprom,
1091         .get_strings            = dsa_slave_get_strings,
1092         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1093         .get_sset_count         = dsa_slave_get_sset_count,
1094         .set_wol                = dsa_slave_set_wol,
1095         .get_wol                = dsa_slave_get_wol,
1096         .set_eee                = dsa_slave_set_eee,
1097         .get_eee                = dsa_slave_get_eee,
1098         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1099         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1100         .get_rxnfc              = dsa_slave_get_rxnfc,
1101         .set_rxnfc              = dsa_slave_set_rxnfc,
1102         .get_ts_info            = dsa_slave_get_ts_info,
1103 };
1104
1105 /* legacy way, bypassing the bridge *****************************************/
1106 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1107                        struct net_device *dev,
1108                        const unsigned char *addr, u16 vid,
1109                        u16 flags,
1110                        struct netlink_ext_ack *extack)
1111 {
1112         struct dsa_port *dp = dsa_slave_to_port(dev);
1113
1114         return dsa_port_fdb_add(dp, addr, vid);
1115 }
1116
1117 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1118                        struct net_device *dev,
1119                        const unsigned char *addr, u16 vid)
1120 {
1121         struct dsa_port *dp = dsa_slave_to_port(dev);
1122
1123         return dsa_port_fdb_del(dp, addr, vid);
1124 }
1125
1126 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1127 {
1128         struct dsa_port *dp = dsa_slave_to_port(dev);
1129
1130         return dp->ds->devlink ? &dp->devlink_port : NULL;
1131 }
1132
1133 static const struct net_device_ops dsa_slave_netdev_ops = {
1134         .ndo_open               = dsa_slave_open,
1135         .ndo_stop               = dsa_slave_close,
1136         .ndo_start_xmit         = dsa_slave_xmit,
1137         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1138         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1139         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1140         .ndo_fdb_add            = dsa_legacy_fdb_add,
1141         .ndo_fdb_del            = dsa_legacy_fdb_del,
1142         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1143         .ndo_do_ioctl           = dsa_slave_ioctl,
1144         .ndo_get_iflink         = dsa_slave_get_iflink,
1145 #ifdef CONFIG_NET_POLL_CONTROLLER
1146         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1147         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1148         .ndo_poll_controller    = dsa_slave_poll_controller,
1149 #endif
1150         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1151         .ndo_setup_tc           = dsa_slave_setup_tc,
1152         .ndo_get_stats64        = dsa_slave_get_stats64,
1153         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1154         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1155         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1156         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1157 };
1158
1159 static struct device_type dsa_type = {
1160         .name   = "dsa",
1161 };
1162
1163 static void dsa_slave_phylink_validate(struct net_device *dev,
1164                                        unsigned long *supported,
1165                                        struct phylink_link_state *state)
1166 {
1167         struct dsa_port *dp = dsa_slave_to_port(dev);
1168         struct dsa_switch *ds = dp->ds;
1169
1170         if (!ds->ops->phylink_validate)
1171                 return;
1172
1173         ds->ops->phylink_validate(ds, dp->index, supported, state);
1174 }
1175
1176 static int dsa_slave_phylink_mac_link_state(struct net_device *dev,
1177                                             struct phylink_link_state *state)
1178 {
1179         struct dsa_port *dp = dsa_slave_to_port(dev);
1180         struct dsa_switch *ds = dp->ds;
1181
1182         /* Only called for SGMII and 802.3z */
1183         if (!ds->ops->phylink_mac_link_state)
1184                 return -EOPNOTSUPP;
1185
1186         return ds->ops->phylink_mac_link_state(ds, dp->index, state);
1187 }
1188
1189 static void dsa_slave_phylink_mac_config(struct net_device *dev,
1190                                          unsigned int mode,
1191                                          const struct phylink_link_state *state)
1192 {
1193         struct dsa_port *dp = dsa_slave_to_port(dev);
1194         struct dsa_switch *ds = dp->ds;
1195
1196         if (!ds->ops->phylink_mac_config)
1197                 return;
1198
1199         ds->ops->phylink_mac_config(ds, dp->index, mode, state);
1200 }
1201
1202 static void dsa_slave_phylink_mac_an_restart(struct net_device *dev)
1203 {
1204         struct dsa_port *dp = dsa_slave_to_port(dev);
1205         struct dsa_switch *ds = dp->ds;
1206
1207         if (!ds->ops->phylink_mac_an_restart)
1208                 return;
1209
1210         ds->ops->phylink_mac_an_restart(ds, dp->index);
1211 }
1212
1213 static void dsa_slave_phylink_mac_link_down(struct net_device *dev,
1214                                             unsigned int mode,
1215                                             phy_interface_t interface)
1216 {
1217         struct dsa_port *dp = dsa_slave_to_port(dev);
1218         struct dsa_switch *ds = dp->ds;
1219
1220         if (!ds->ops->phylink_mac_link_down) {
1221                 if (ds->ops->adjust_link && dev->phydev)
1222                         ds->ops->adjust_link(ds, dp->index, dev->phydev);
1223                 return;
1224         }
1225
1226         ds->ops->phylink_mac_link_down(ds, dp->index, mode, interface);
1227 }
1228
1229 static void dsa_slave_phylink_mac_link_up(struct net_device *dev,
1230                                           unsigned int mode,
1231                                           phy_interface_t interface,
1232                                           struct phy_device *phydev)
1233 {
1234         struct dsa_port *dp = dsa_slave_to_port(dev);
1235         struct dsa_switch *ds = dp->ds;
1236
1237         if (!ds->ops->phylink_mac_link_up) {
1238                 if (ds->ops->adjust_link && dev->phydev)
1239                         ds->ops->adjust_link(ds, dp->index, dev->phydev);
1240                 return;
1241         }
1242
1243         ds->ops->phylink_mac_link_up(ds, dp->index, mode, interface, phydev);
1244 }
1245
1246 static const struct phylink_mac_ops dsa_slave_phylink_mac_ops = {
1247         .validate = dsa_slave_phylink_validate,
1248         .mac_link_state = dsa_slave_phylink_mac_link_state,
1249         .mac_config = dsa_slave_phylink_mac_config,
1250         .mac_an_restart = dsa_slave_phylink_mac_an_restart,
1251         .mac_link_down = dsa_slave_phylink_mac_link_down,
1252         .mac_link_up = dsa_slave_phylink_mac_link_up,
1253 };
1254
1255 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1256 {
1257         const struct dsa_port *dp = dsa_to_port(ds, port);
1258
1259         phylink_mac_change(dp->pl, up);
1260 }
1261 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1262
1263 static void dsa_slave_phylink_fixed_state(struct net_device *dev,
1264                                           struct phylink_link_state *state)
1265 {
1266         struct dsa_port *dp = dsa_slave_to_port(dev);
1267         struct dsa_switch *ds = dp->ds;
1268
1269         /* No need to check that this operation is valid, the callback would
1270          * not be called if it was not.
1271          */
1272         ds->ops->phylink_fixed_state(ds, dp->index, state);
1273 }
1274
1275 /* slave device setup *******************************************************/
1276 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1277 {
1278         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1279         struct dsa_switch *ds = dp->ds;
1280
1281         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1282         if (!slave_dev->phydev) {
1283                 netdev_err(slave_dev, "no phy at %d\n", addr);
1284                 return -ENODEV;
1285         }
1286
1287         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1288 }
1289
1290 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1291 {
1292         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1293         struct device_node *port_dn = dp->dn;
1294         struct dsa_switch *ds = dp->ds;
1295         u32 phy_flags = 0;
1296         int mode, ret;
1297
1298         mode = of_get_phy_mode(port_dn);
1299         if (mode < 0)
1300                 mode = PHY_INTERFACE_MODE_NA;
1301
1302         dp->pl = phylink_create(slave_dev, of_fwnode_handle(port_dn), mode,
1303                                 &dsa_slave_phylink_mac_ops);
1304         if (IS_ERR(dp->pl)) {
1305                 netdev_err(slave_dev,
1306                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1307                 return PTR_ERR(dp->pl);
1308         }
1309
1310         /* Register only if the switch provides such a callback, since this
1311          * callback takes precedence over polling the link GPIO in PHYLINK
1312          * (see phylink_get_fixed_state).
1313          */
1314         if (ds->ops->phylink_fixed_state)
1315                 phylink_fixed_state_cb(dp->pl, dsa_slave_phylink_fixed_state);
1316
1317         if (ds->ops->get_phy_flags)
1318                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1319
1320         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1321         if (ret == -ENODEV && ds->slave_mii_bus) {
1322                 /* We could not connect to a designated PHY or SFP, so try to
1323                  * use the switch internal MDIO bus instead
1324                  */
1325                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1326                 if (ret) {
1327                         netdev_err(slave_dev,
1328                                    "failed to connect to port %d: %d\n",
1329                                    dp->index, ret);
1330                         phylink_destroy(dp->pl);
1331                         return ret;
1332                 }
1333         }
1334
1335         return ret;
1336 }
1337
1338 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1339 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1340                                             struct netdev_queue *txq,
1341                                             void *_unused)
1342 {
1343         lockdep_set_class(&txq->_xmit_lock,
1344                           &dsa_slave_netdev_xmit_lock_key);
1345 }
1346
1347 int dsa_slave_suspend(struct net_device *slave_dev)
1348 {
1349         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1350
1351         if (!netif_running(slave_dev))
1352                 return 0;
1353
1354         cancel_work_sync(&dp->xmit_work);
1355         skb_queue_purge(&dp->xmit_queue);
1356
1357         netif_device_detach(slave_dev);
1358
1359         rtnl_lock();
1360         phylink_stop(dp->pl);
1361         rtnl_unlock();
1362
1363         return 0;
1364 }
1365
1366 int dsa_slave_resume(struct net_device *slave_dev)
1367 {
1368         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1369
1370         if (!netif_running(slave_dev))
1371                 return 0;
1372
1373         netif_device_attach(slave_dev);
1374
1375         rtnl_lock();
1376         phylink_start(dp->pl);
1377         rtnl_unlock();
1378
1379         return 0;
1380 }
1381
1382 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1383 {
1384         struct net_device *master = dsa_slave_to_master(dev);
1385         struct dsa_port *dp = dsa_slave_to_port(dev);
1386         struct dsa_notifier_register_info rinfo = {
1387                 .switch_number = dp->ds->index,
1388                 .port_number = dp->index,
1389                 .master = master,
1390                 .info.dev = dev,
1391         };
1392
1393         call_dsa_notifiers(val, dev, &rinfo.info);
1394 }
1395
1396 int dsa_slave_create(struct dsa_port *port)
1397 {
1398         const struct dsa_port *cpu_dp = port->cpu_dp;
1399         struct net_device *master = cpu_dp->master;
1400         struct dsa_switch *ds = port->ds;
1401         const char *name = port->name;
1402         struct net_device *slave_dev;
1403         struct dsa_slave_priv *p;
1404         int ret;
1405
1406         if (!ds->num_tx_queues)
1407                 ds->num_tx_queues = 1;
1408
1409         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1410                                      NET_NAME_UNKNOWN, ether_setup,
1411                                      ds->num_tx_queues, 1);
1412         if (slave_dev == NULL)
1413                 return -ENOMEM;
1414
1415         slave_dev->features = master->vlan_features | NETIF_F_HW_TC |
1416                                 NETIF_F_HW_VLAN_CTAG_FILTER;
1417         slave_dev->hw_features |= NETIF_F_HW_TC;
1418         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1419         if (!IS_ERR_OR_NULL(port->mac))
1420                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1421         else
1422                 eth_hw_addr_inherit(slave_dev, master);
1423         slave_dev->priv_flags |= IFF_NO_QUEUE;
1424         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1425         slave_dev->min_mtu = 0;
1426         slave_dev->max_mtu = ETH_MAX_MTU;
1427         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1428
1429         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1430                                  NULL);
1431
1432         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1433         slave_dev->dev.of_node = port->dn;
1434         slave_dev->vlan_features = master->vlan_features;
1435
1436         p = netdev_priv(slave_dev);
1437         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1438         if (!p->stats64) {
1439                 free_netdev(slave_dev);
1440                 return -ENOMEM;
1441         }
1442         p->dp = port;
1443         INIT_LIST_HEAD(&p->mall_tc_list);
1444         INIT_WORK(&port->xmit_work, dsa_port_xmit_work);
1445         skb_queue_head_init(&port->xmit_queue);
1446         p->xmit = cpu_dp->tag_ops->xmit;
1447         port->slave = slave_dev;
1448
1449         netif_carrier_off(slave_dev);
1450
1451         ret = dsa_slave_phy_setup(slave_dev);
1452         if (ret) {
1453                 netdev_err(master, "error %d setting up slave phy\n", ret);
1454                 goto out_free;
1455         }
1456
1457         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1458
1459         ret = register_netdev(slave_dev);
1460         if (ret) {
1461                 netdev_err(master, "error %d registering interface %s\n",
1462                            ret, slave_dev->name);
1463                 goto out_phy;
1464         }
1465
1466         return 0;
1467
1468 out_phy:
1469         rtnl_lock();
1470         phylink_disconnect_phy(p->dp->pl);
1471         rtnl_unlock();
1472         phylink_destroy(p->dp->pl);
1473 out_free:
1474         free_percpu(p->stats64);
1475         free_netdev(slave_dev);
1476         port->slave = NULL;
1477         return ret;
1478 }
1479
1480 void dsa_slave_destroy(struct net_device *slave_dev)
1481 {
1482         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1483         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1484
1485         netif_carrier_off(slave_dev);
1486         rtnl_lock();
1487         phylink_disconnect_phy(dp->pl);
1488         rtnl_unlock();
1489
1490         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1491         unregister_netdev(slave_dev);
1492         phylink_destroy(dp->pl);
1493         free_percpu(p->stats64);
1494         free_netdev(slave_dev);
1495 }
1496
1497 static bool dsa_slave_dev_check(struct net_device *dev)
1498 {
1499         return dev->netdev_ops == &dsa_slave_netdev_ops;
1500 }
1501
1502 static int dsa_slave_changeupper(struct net_device *dev,
1503                                  struct netdev_notifier_changeupper_info *info)
1504 {
1505         struct dsa_port *dp = dsa_slave_to_port(dev);
1506         int err = NOTIFY_DONE;
1507
1508         if (netif_is_bridge_master(info->upper_dev)) {
1509                 if (info->linking) {
1510                         err = dsa_port_bridge_join(dp, info->upper_dev);
1511                         err = notifier_from_errno(err);
1512                 } else {
1513                         dsa_port_bridge_leave(dp, info->upper_dev);
1514                         err = NOTIFY_OK;
1515                 }
1516         }
1517
1518         return err;
1519 }
1520
1521 static int dsa_slave_upper_vlan_check(struct net_device *dev,
1522                                       struct netdev_notifier_changeupper_info *
1523                                       info)
1524 {
1525         struct netlink_ext_ack *ext_ack;
1526         struct net_device *slave;
1527         struct dsa_port *dp;
1528
1529         ext_ack = netdev_notifier_info_to_extack(&info->info);
1530
1531         if (!is_vlan_dev(dev))
1532                 return NOTIFY_DONE;
1533
1534         slave = vlan_dev_real_dev(dev);
1535         if (!dsa_slave_dev_check(slave))
1536                 return NOTIFY_DONE;
1537
1538         dp = dsa_slave_to_port(slave);
1539         if (!dp->bridge_dev)
1540                 return NOTIFY_DONE;
1541
1542         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1543         if (br_vlan_enabled(dp->bridge_dev) &&
1544             netif_is_bridge_master(info->upper_dev) && info->linking) {
1545                 NL_SET_ERR_MSG_MOD(ext_ack,
1546                                    "Cannot enslave VLAN device into VLAN aware bridge");
1547                 return notifier_from_errno(-EINVAL);
1548         }
1549
1550         return NOTIFY_DONE;
1551 }
1552
1553 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1554                                      unsigned long event, void *ptr)
1555 {
1556         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1557
1558         if (event == NETDEV_CHANGEUPPER) {
1559                 if (!dsa_slave_dev_check(dev))
1560                         return dsa_slave_upper_vlan_check(dev, ptr);
1561
1562                 return dsa_slave_changeupper(dev, ptr);
1563         }
1564
1565         return NOTIFY_DONE;
1566 }
1567
1568 static int
1569 dsa_slave_switchdev_port_attr_set_event(struct net_device *netdev,
1570                 struct switchdev_notifier_port_attr_info *port_attr_info)
1571 {
1572         int err;
1573
1574         err = dsa_slave_port_attr_set(netdev, port_attr_info->attr,
1575                                       port_attr_info->trans);
1576
1577         port_attr_info->handled = true;
1578         return notifier_from_errno(err);
1579 }
1580
1581 struct dsa_switchdev_event_work {
1582         struct work_struct work;
1583         struct switchdev_notifier_fdb_info fdb_info;
1584         struct net_device *dev;
1585         unsigned long event;
1586 };
1587
1588 static void dsa_slave_switchdev_event_work(struct work_struct *work)
1589 {
1590         struct dsa_switchdev_event_work *switchdev_work =
1591                 container_of(work, struct dsa_switchdev_event_work, work);
1592         struct net_device *dev = switchdev_work->dev;
1593         struct switchdev_notifier_fdb_info *fdb_info;
1594         struct dsa_port *dp = dsa_slave_to_port(dev);
1595         int err;
1596
1597         rtnl_lock();
1598         switch (switchdev_work->event) {
1599         case SWITCHDEV_FDB_ADD_TO_DEVICE:
1600                 fdb_info = &switchdev_work->fdb_info;
1601                 if (!fdb_info->added_by_user)
1602                         break;
1603
1604                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
1605                 if (err) {
1606                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
1607                         break;
1608                 }
1609                 fdb_info->offloaded = true;
1610                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
1611                                          &fdb_info->info, NULL);
1612                 break;
1613
1614         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1615                 fdb_info = &switchdev_work->fdb_info;
1616                 if (!fdb_info->added_by_user)
1617                         break;
1618
1619                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
1620                 if (err) {
1621                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
1622                         dev_close(dev);
1623                 }
1624                 break;
1625         }
1626         rtnl_unlock();
1627
1628         kfree(switchdev_work->fdb_info.addr);
1629         kfree(switchdev_work);
1630         dev_put(dev);
1631 }
1632
1633 static int
1634 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
1635                                   switchdev_work,
1636                                   const struct switchdev_notifier_fdb_info *
1637                                   fdb_info)
1638 {
1639         memcpy(&switchdev_work->fdb_info, fdb_info,
1640                sizeof(switchdev_work->fdb_info));
1641         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
1642         if (!switchdev_work->fdb_info.addr)
1643                 return -ENOMEM;
1644         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
1645                         fdb_info->addr);
1646         return 0;
1647 }
1648
1649 /* Called under rcu_read_lock() */
1650 static int dsa_slave_switchdev_event(struct notifier_block *unused,
1651                                      unsigned long event, void *ptr)
1652 {
1653         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1654         struct dsa_switchdev_event_work *switchdev_work;
1655
1656         if (!dsa_slave_dev_check(dev))
1657                 return NOTIFY_DONE;
1658
1659         if (event == SWITCHDEV_PORT_ATTR_SET)
1660                 return dsa_slave_switchdev_port_attr_set_event(dev, ptr);
1661
1662         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
1663         if (!switchdev_work)
1664                 return NOTIFY_BAD;
1665
1666         INIT_WORK(&switchdev_work->work,
1667                   dsa_slave_switchdev_event_work);
1668         switchdev_work->dev = dev;
1669         switchdev_work->event = event;
1670
1671         switch (event) {
1672         case SWITCHDEV_FDB_ADD_TO_DEVICE: /* fall through */
1673         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1674                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
1675                         goto err_fdb_work_init;
1676                 dev_hold(dev);
1677                 break;
1678         default:
1679                 kfree(switchdev_work);
1680                 return NOTIFY_DONE;
1681         }
1682
1683         dsa_schedule_work(&switchdev_work->work);
1684         return NOTIFY_OK;
1685
1686 err_fdb_work_init:
1687         kfree(switchdev_work);
1688         return NOTIFY_BAD;
1689 }
1690
1691 static int
1692 dsa_slave_switchdev_port_obj_event(unsigned long event,
1693                         struct net_device *netdev,
1694                         struct switchdev_notifier_port_obj_info *port_obj_info)
1695 {
1696         int err = -EOPNOTSUPP;
1697
1698         switch (event) {
1699         case SWITCHDEV_PORT_OBJ_ADD:
1700                 err = dsa_slave_port_obj_add(netdev, port_obj_info->obj,
1701                                              port_obj_info->trans);
1702                 break;
1703         case SWITCHDEV_PORT_OBJ_DEL:
1704                 err = dsa_slave_port_obj_del(netdev, port_obj_info->obj);
1705                 break;
1706         }
1707
1708         port_obj_info->handled = true;
1709         return notifier_from_errno(err);
1710 }
1711
1712 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
1713                                               unsigned long event, void *ptr)
1714 {
1715         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1716
1717         if (!dsa_slave_dev_check(dev))
1718                 return NOTIFY_DONE;
1719
1720         switch (event) {
1721         case SWITCHDEV_PORT_OBJ_ADD: /* fall through */
1722         case SWITCHDEV_PORT_OBJ_DEL:
1723                 return dsa_slave_switchdev_port_obj_event(event, dev, ptr);
1724         case SWITCHDEV_PORT_ATTR_SET:
1725                 return dsa_slave_switchdev_port_attr_set_event(dev, ptr);
1726         }
1727
1728         return NOTIFY_DONE;
1729 }
1730
1731 static struct notifier_block dsa_slave_nb __read_mostly = {
1732         .notifier_call  = dsa_slave_netdevice_event,
1733 };
1734
1735 static struct notifier_block dsa_slave_switchdev_notifier = {
1736         .notifier_call = dsa_slave_switchdev_event,
1737 };
1738
1739 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
1740         .notifier_call = dsa_slave_switchdev_blocking_event,
1741 };
1742
1743 int dsa_slave_register_notifier(void)
1744 {
1745         struct notifier_block *nb;
1746         int err;
1747
1748         err = register_netdevice_notifier(&dsa_slave_nb);
1749         if (err)
1750                 return err;
1751
1752         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
1753         if (err)
1754                 goto err_switchdev_nb;
1755
1756         nb = &dsa_slave_switchdev_blocking_notifier;
1757         err = register_switchdev_blocking_notifier(nb);
1758         if (err)
1759                 goto err_switchdev_blocking_nb;
1760
1761         return 0;
1762
1763 err_switchdev_blocking_nb:
1764         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
1765 err_switchdev_nb:
1766         unregister_netdevice_notifier(&dsa_slave_nb);
1767         return err;
1768 }
1769
1770 void dsa_slave_unregister_notifier(void)
1771 {
1772         struct notifier_block *nb;
1773         int err;
1774
1775         nb = &dsa_slave_switchdev_blocking_notifier;
1776         err = unregister_switchdev_blocking_notifier(nb);
1777         if (err)
1778                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
1779
1780         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
1781         if (err)
1782                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
1783
1784         err = unregister_netdevice_notifier(&dsa_slave_nb);
1785         if (err)
1786                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
1787 }