net/dsa/slave.c

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