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