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