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         /* We need the dedicated CPU port to be a member of the VLAN as well.
 336          * Even though drivers often handle CPU membership in special ways,
 337          * it doesn't make sense to program a PVID, so clear this flag.
 338          */
 339         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 340
 341         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, trans);
 342         if (err)
 343                 return err;
 344
 345         return 0;
 346 }
 347
 348 static int dsa_slave_port_obj_add(struct net_device *dev,
 349                                   const struct switchdev_obj *obj,
 350                                   struct switchdev_trans *trans,
 351                                   struct netlink_ext_ack *extack)
 352 {
 353         struct dsa_port *dp = dsa_slave_to_port(dev);
 354         int err;
 355
 356         /* For the prepare phase, ensure the full set of changes is feasable in
 357          * one go in order to signal a failure properly. If an operation is not
 358          * supported, return -EOPNOTSUPP.
 359          */
 360
 361         switch (obj->id) {
 362         case SWITCHDEV_OBJ_ID_PORT_MDB:
 363                 if (obj->orig_dev != dev)
 364                         return -EOPNOTSUPP;
 365                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 366                 break;
 367         case SWITCHDEV_OBJ_ID_HOST_MDB:
 368                 /* DSA can directly translate this to a normal MDB add,
 369                  * but on the CPU port.
 370                  */
 371                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj),
 372                                        trans);
 373                 break;
 374         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 375                 err = dsa_slave_vlan_add(dev, obj, trans);
 376                 break;
 377         default:
 378                 err = -EOPNOTSUPP;
 379                 break;
 380         }
 381
 382         return err;
 383 }
 384
 385 static int dsa_slave_vlan_del(struct net_device *dev,
 386                               const struct switchdev_obj *obj)
 387 {
 388         struct dsa_port *dp = dsa_slave_to_port(dev);
 389
 390         if (obj->orig_dev != dev)
 391                 return -EOPNOTSUPP;
 392
 393         if (dp->bridge_dev && !br_vlan_enabled(dp->bridge_dev))
 394                 return 0;
 395
 396         /* Do not deprogram the CPU port as it may be shared with other user
 397          * ports which can be members of this VLAN as well.
 398          */
 399         return dsa_port_vlan_del(dp, SWITCHDEV_OBJ_PORT_VLAN(obj));
 400 }
 401
 402 static int dsa_slave_port_obj_del(struct net_device *dev,
 403                                   const struct switchdev_obj *obj)
 404 {
 405         struct dsa_port *dp = dsa_slave_to_port(dev);
 406         int err;
 407
 408         switch (obj->id) {
 409         case SWITCHDEV_OBJ_ID_PORT_MDB:
 410                 if (obj->orig_dev != dev)
 411                         return -EOPNOTSUPP;
 412                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 413                 break;
 414         case SWITCHDEV_OBJ_ID_HOST_MDB:
 415                 /* DSA can directly translate this to a normal MDB add,
 416                  * but on the CPU port.
 417                  */
 418                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 419                 break;
 420         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 421                 err = dsa_slave_vlan_del(dev, obj);
 422                 break;
 423         default:
 424                 err = -EOPNOTSUPP;
 425                 break;
 426         }
 427
 428         return err;
 429 }
 430
 431 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 432                                         struct netdev_phys_item_id *ppid)
 433 {
 434         struct dsa_port *dp = dsa_slave_to_port(dev);
 435         struct dsa_switch *ds = dp->ds;
 436         struct dsa_switch_tree *dst = ds->dst;
 437
 438         /* For non-legacy ports, devlink is used and it takes
 439          * care of the name generation. This ndo implementation
 440          * should be removed with legacy support.
 441          */
 442         if (dp->ds->devlink)
 443                 return -EOPNOTSUPP;
 444
 445         ppid->id_len = sizeof(dst->index);
 446         memcpy(&ppid->id, &dst->index, ppid->id_len);
 447
 448         return 0;
 449 }
 450
 451 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 452                                                      struct sk_buff *skb)
 453 {
 454 #ifdef CONFIG_NET_POLL_CONTROLLER
 455         struct dsa_slave_priv *p = netdev_priv(dev);
 456
 457         if (p->netpoll)
 458                 netpoll_send_skb(p->netpoll, skb);
 459 #else
 460         BUG();
 461 #endif
 462         return NETDEV_TX_OK;
 463 }
 464
 465 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 466                                  struct sk_buff *skb)
 467 {
 468         struct dsa_switch *ds = p->dp->ds;
 469         struct sk_buff *clone;
 470         unsigned int type;
 471
 472         type = ptp_classify_raw(skb);
 473         if (type == PTP_CLASS_NONE)
 474                 return;
 475
 476         if (!ds->ops->port_txtstamp)
 477                 return;
 478
 479         clone = skb_clone_sk(skb);
 480         if (!clone)
 481                 return;
 482
 483         DSA_SKB_CB(skb)->clone = clone;
 484
 485         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type))
 486                 return;
 487
 488         kfree_skb(clone);
 489 }
 490
 491 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 492 {
 493         /* SKB for netpoll still need to be mangled with the protocol-specific
 494          * tag to be successfully transmitted
 495          */
 496         if (unlikely(netpoll_tx_running(dev)))
 497                 return dsa_slave_netpoll_send_skb(dev, skb);
 498
 499         /* Queue the SKB for transmission on the parent interface, but
 500          * do not modify its EtherType
 501          */
 502         skb->dev = dsa_slave_to_master(dev);
 503         dev_queue_xmit(skb);
 504
 505         return NETDEV_TX_OK;
 506 }
 507 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 508
 509 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 510 {
 511         struct dsa_slave_priv *p = netdev_priv(dev);
 512         struct pcpu_sw_netstats *s;
 513         struct sk_buff *nskb;
 514
 515         s = this_cpu_ptr(p->stats64);
 516         u64_stats_update_begin(&s->syncp);
 517         s->tx_packets++;
 518         s->tx_bytes += skb->len;
 519         u64_stats_update_end(&s->syncp);
 520
 521         DSA_SKB_CB(skb)->deferred_xmit = false;
 522         DSA_SKB_CB(skb)->clone = NULL;
 523
 524         /* Identify PTP protocol packets, clone them, and pass them to the
 525          * switch driver
 526          */
 527         dsa_skb_tx_timestamp(p, skb);
 528
 529         /* Transmit function may have to reallocate the original SKB,
 530          * in which case it must have freed it. Only free it here on error.
 531          */
 532         nskb = p->xmit(skb, dev);
 533         if (!nskb) {
 534                 if (!DSA_SKB_CB(skb)->deferred_xmit)
 535                         kfree_skb(skb);
 536                 return NETDEV_TX_OK;
 537         }
 538
 539         return dsa_enqueue_skb(nskb, dev);
 540 }
 541
 542 void *dsa_defer_xmit(struct sk_buff *skb, struct net_device *dev)
 543 {
 544         struct dsa_port *dp = dsa_slave_to_port(dev);
 545
 546         DSA_SKB_CB(skb)->deferred_xmit = true;
 547
 548         skb_queue_tail(&dp->xmit_queue, skb);
 549         schedule_work(&dp->xmit_work);
 550         return NULL;
 551 }
 552 EXPORT_SYMBOL_GPL(dsa_defer_xmit);
 553
 554 static void dsa_port_xmit_work(struct work_struct *work)
 555 {
 556         struct dsa_port *dp = container_of(work, struct dsa_port, xmit_work);
 557         struct dsa_switch *ds = dp->ds;
 558         struct sk_buff *skb;
 559
 560         if (unlikely(!ds->ops->port_deferred_xmit))
 561                 return;
 562
 563         while ((skb = skb_dequeue(&dp->xmit_queue)) != NULL)
 564                 ds->ops->port_deferred_xmit(ds, dp->index, skb);
 565 }
 566
 567 /* ethtool operations *******************************************************/
 568
 569 static void dsa_slave_get_drvinfo(struct net_device *dev,
 570                                   struct ethtool_drvinfo *drvinfo)
 571 {
 572         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 573         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 574         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 575 }
 576
 577 static int dsa_slave_get_regs_len(struct net_device *dev)
 578 {
 579         struct dsa_port *dp = dsa_slave_to_port(dev);
 580         struct dsa_switch *ds = dp->ds;
 581
 582         if (ds->ops->get_regs_len)
 583                 return ds->ops->get_regs_len(ds, dp->index);
 584
 585         return -EOPNOTSUPP;
 586 }
 587
 588 static void
 589 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 590 {
 591         struct dsa_port *dp = dsa_slave_to_port(dev);
 592         struct dsa_switch *ds = dp->ds;
 593
 594         if (ds->ops->get_regs)
 595                 ds->ops->get_regs(ds, dp->index, regs, _p);
 596 }
 597
 598 static int dsa_slave_nway_reset(struct net_device *dev)
 599 {
 600         struct dsa_port *dp = dsa_slave_to_port(dev);
 601
 602         return phylink_ethtool_nway_reset(dp->pl);
 603 }
 604
 605 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 606 {
 607         struct dsa_port *dp = dsa_slave_to_port(dev);
 608         struct dsa_switch *ds = dp->ds;
 609
 610         if (ds->cd && ds->cd->eeprom_len)
 611                 return ds->cd->eeprom_len;
 612
 613         if (ds->ops->get_eeprom_len)
 614                 return ds->ops->get_eeprom_len(ds);
 615
 616         return 0;
 617 }
 618
 619 static int dsa_slave_get_eeprom(struct net_device *dev,
 620                                 struct ethtool_eeprom *eeprom, u8 *data)
 621 {
 622         struct dsa_port *dp = dsa_slave_to_port(dev);
 623         struct dsa_switch *ds = dp->ds;
 624
 625         if (ds->ops->get_eeprom)
 626                 return ds->ops->get_eeprom(ds, eeprom, data);
 627
 628         return -EOPNOTSUPP;
 629 }
 630
 631 static int dsa_slave_set_eeprom(struct net_device *dev,
 632                                 struct ethtool_eeprom *eeprom, u8 *data)
 633 {
 634         struct dsa_port *dp = dsa_slave_to_port(dev);
 635         struct dsa_switch *ds = dp->ds;
 636
 637         if (ds->ops->set_eeprom)
 638                 return ds->ops->set_eeprom(ds, eeprom, data);
 639
 640         return -EOPNOTSUPP;
 641 }
 642
 643 static void dsa_slave_get_strings(struct net_device *dev,
 644                                   uint32_t stringset, uint8_t *data)
 645 {
 646         struct dsa_port *dp = dsa_slave_to_port(dev);
 647         struct dsa_switch *ds = dp->ds;
 648
 649         if (stringset == ETH_SS_STATS) {
 650                 int len = ETH_GSTRING_LEN;
 651
 652                 strncpy(data, "tx_packets", len);
 653                 strncpy(data + len, "tx_bytes", len);
 654                 strncpy(data + 2 * len, "rx_packets", len);
 655                 strncpy(data + 3 * len, "rx_bytes", len);
 656                 if (ds->ops->get_strings)
 657                         ds->ops->get_strings(ds, dp->index, stringset,
 658                                              data + 4 * len);
 659         }
 660 }
 661
 662 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 663                                         struct ethtool_stats *stats,
 664                                         uint64_t *data)
 665 {
 666         struct dsa_port *dp = dsa_slave_to_port(dev);
 667         struct dsa_slave_priv *p = netdev_priv(dev);
 668         struct dsa_switch *ds = dp->ds;
 669         struct pcpu_sw_netstats *s;
 670         unsigned int start;
 671         int i;
 672
 673         for_each_possible_cpu(i) {
 674                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 675
 676                 s = per_cpu_ptr(p->stats64, i);
 677                 do {
 678                         start = u64_stats_fetch_begin_irq(&s->syncp);
 679                         tx_packets = s->tx_packets;
 680                         tx_bytes = s->tx_bytes;
 681                         rx_packets = s->rx_packets;
 682                         rx_bytes = s->rx_bytes;
 683                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 684                 data[0] += tx_packets;
 685                 data[1] += tx_bytes;
 686                 data[2] += rx_packets;
 687                 data[3] += rx_bytes;
 688         }
 689         if (ds->ops->get_ethtool_stats)
 690                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 691 }
 692
 693 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 694 {
 695         struct dsa_port *dp = dsa_slave_to_port(dev);
 696         struct dsa_switch *ds = dp->ds;
 697
 698         if (sset == ETH_SS_STATS) {
 699                 int count;
 700
 701                 count = 4;
 702                 if (ds->ops->get_sset_count)
 703                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 704
 705                 return count;
 706         }
 707
 708         return -EOPNOTSUPP;
 709 }
 710
 711 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 712 {
 713         struct dsa_port *dp = dsa_slave_to_port(dev);
 714         struct dsa_switch *ds = dp->ds;
 715
 716         phylink_ethtool_get_wol(dp->pl, w);
 717
 718         if (ds->ops->get_wol)
 719                 ds->ops->get_wol(ds, dp->index, w);
 720 }
 721
 722 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 723 {
 724         struct dsa_port *dp = dsa_slave_to_port(dev);
 725         struct dsa_switch *ds = dp->ds;
 726         int ret = -EOPNOTSUPP;
 727
 728         phylink_ethtool_set_wol(dp->pl, w);
 729
 730         if (ds->ops->set_wol)
 731                 ret = ds->ops->set_wol(ds, dp->index, w);
 732
 733         return ret;
 734 }
 735
 736 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 737 {
 738         struct dsa_port *dp = dsa_slave_to_port(dev);
 739         struct dsa_switch *ds = dp->ds;
 740         int ret;
 741
 742         /* Port's PHY and MAC both need to be EEE capable */
 743         if (!dev->phydev || !dp->pl)
 744                 return -ENODEV;
 745
 746         if (!ds->ops->set_mac_eee)
 747                 return -EOPNOTSUPP;
 748
 749         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 750         if (ret)
 751                 return ret;
 752
 753         return phylink_ethtool_set_eee(dp->pl, e);
 754 }
 755
 756 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 757 {
 758         struct dsa_port *dp = dsa_slave_to_port(dev);
 759         struct dsa_switch *ds = dp->ds;
 760         int ret;
 761
 762         /* Port's PHY and MAC both need to be EEE capable */
 763         if (!dev->phydev || !dp->pl)
 764                 return -ENODEV;
 765
 766         if (!ds->ops->get_mac_eee)
 767                 return -EOPNOTSUPP;
 768
 769         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 770         if (ret)
 771                 return ret;
 772
 773         return phylink_ethtool_get_eee(dp->pl, e);
 774 }
 775
 776 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 777                                         struct ethtool_link_ksettings *cmd)
 778 {
 779         struct dsa_port *dp = dsa_slave_to_port(dev);
 780
 781         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 782 }
 783
 784 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 785                                         const struct ethtool_link_ksettings *cmd)
 786 {
 787         struct dsa_port *dp = dsa_slave_to_port(dev);
 788
 789         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 790 }
 791
 792 static void dsa_slave_get_pauseparam(struct net_device *dev,
 793                                      struct ethtool_pauseparam *pause)
 794 {
 795         struct dsa_port *dp = dsa_slave_to_port(dev);
 796
 797         phylink_ethtool_get_pauseparam(dp->pl, pause);
 798 }
 799
 800 static int dsa_slave_set_pauseparam(struct net_device *dev,
 801                                     struct ethtool_pauseparam *pause)
 802 {
 803         struct dsa_port *dp = dsa_slave_to_port(dev);
 804
 805         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 806 }
 807
 808 #ifdef CONFIG_NET_POLL_CONTROLLER
 809 static int dsa_slave_netpoll_setup(struct net_device *dev,
 810                                    struct netpoll_info *ni)
 811 {
 812         struct net_device *master = dsa_slave_to_master(dev);
 813         struct dsa_slave_priv *p = netdev_priv(dev);
 814         struct netpoll *netpoll;
 815         int err = 0;
 816
 817         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 818         if (!netpoll)
 819                 return -ENOMEM;
 820
 821         err = __netpoll_setup(netpoll, master);
 822         if (err) {
 823                 kfree(netpoll);
 824                 goto out;
 825         }
 826
 827         p->netpoll = netpoll;
 828 out:
 829         return err;
 830 }
 831
 832 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 833 {
 834         struct dsa_slave_priv *p = netdev_priv(dev);
 835         struct netpoll *netpoll = p->netpoll;
 836
 837         if (!netpoll)
 838                 return;
 839
 840         p->netpoll = NULL;
 841
 842         __netpoll_free(netpoll);
 843 }
 844
 845 static void dsa_slave_poll_controller(struct net_device *dev)
 846 {
 847 }
 848 #endif
 849
 850 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 851                                         char *name, size_t len)
 852 {
 853         struct dsa_port *dp = dsa_slave_to_port(dev);
 854
 855         /* For non-legacy ports, devlink is used and it takes
 856          * care of the name generation. This ndo implementation
 857          * should be removed with legacy support.
 858          */
 859         if (dp->ds->devlink)
 860                 return -EOPNOTSUPP;
 861
 862         if (snprintf(name, len, "p%d", dp->index) >= len)
 863                 return -EINVAL;
 864
 865         return 0;
 866 }
 867
 868 static struct dsa_mall_tc_entry *
 869 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 870 {
 871         struct dsa_slave_priv *p = netdev_priv(dev);
 872         struct dsa_mall_tc_entry *mall_tc_entry;
 873
 874         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 875                 if (mall_tc_entry->cookie == cookie)
 876                         return mall_tc_entry;
 877
 878         return NULL;
 879 }
 880
 881 static int dsa_slave_add_cls_matchall(struct net_device *dev,
 882                                       struct tc_cls_matchall_offload *cls,
 883                                       bool ingress)
 884 {
 885         struct dsa_port *dp = dsa_slave_to_port(dev);
 886         struct dsa_slave_priv *p = netdev_priv(dev);
 887         struct dsa_mall_tc_entry *mall_tc_entry;
 888         __be16 protocol = cls->common.protocol;
 889         struct dsa_switch *ds = dp->ds;
 890         struct flow_action_entry *act;
 891         struct dsa_port *to_dp;
 892         int err = -EOPNOTSUPP;
 893
 894         if (!ds->ops->port_mirror_add)
 895                 return err;
 896
 897         if (!flow_offload_has_one_action(&cls->rule->action))
 898                 return err;
 899
 900         act = &cls->rule->action.entries[0];
 901
 902         if (act->id == FLOW_ACTION_MIRRED && protocol == htons(ETH_P_ALL)) {
 903                 struct dsa_mall_mirror_tc_entry *mirror;
 904
 905                 if (!act->dev)
 906                         return -EINVAL;
 907
 908                 if (!dsa_slave_dev_check(act->dev))
 909                         return -EOPNOTSUPP;
 910
 911                 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 912                 if (!mall_tc_entry)
 913                         return -ENOMEM;
 914
 915                 mall_tc_entry->cookie = cls->cookie;
 916                 mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 917                 mirror = &mall_tc_entry->mirror;
 918
 919                 to_dp = dsa_slave_to_port(act->dev);
 920
 921                 mirror->to_local_port = to_dp->index;
 922                 mirror->ingress = ingress;
 923
 924                 err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 925                 if (err) {
 926                         kfree(mall_tc_entry);
 927                         return err;
 928                 }
 929
 930                 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 931         }
 932
 933         return 0;
 934 }
 935
 936 static void dsa_slave_del_cls_matchall(struct net_device *dev,
 937                                        struct tc_cls_matchall_offload *cls)
 938 {
 939         struct dsa_port *dp = dsa_slave_to_port(dev);
 940         struct dsa_mall_tc_entry *mall_tc_entry;
 941         struct dsa_switch *ds = dp->ds;
 942
 943         if (!ds->ops->port_mirror_del)
 944                 return;
 945
 946         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
 947         if (!mall_tc_entry)
 948                 return;
 949
 950         list_del(&mall_tc_entry->list);
 951
 952         switch (mall_tc_entry->type) {
 953         case DSA_PORT_MALL_MIRROR:
 954                 ds->ops->port_mirror_del(ds, dp->index, &mall_tc_entry->mirror);
 955                 break;
 956         default:
 957                 WARN_ON(1);
 958         }
 959
 960         kfree(mall_tc_entry);
 961 }
 962
 963 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
 964                                            struct tc_cls_matchall_offload *cls,
 965                                            bool ingress)
 966 {
 967         if (cls->common.chain_index)
 968                 return -EOPNOTSUPP;
 969
 970         switch (cls->command) {
 971         case TC_CLSMATCHALL_REPLACE:
 972                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
 973         case TC_CLSMATCHALL_DESTROY:
 974                 dsa_slave_del_cls_matchall(dev, cls);
 975                 return 0;
 976         default:
 977                 return -EOPNOTSUPP;
 978         }
 979 }
 980
 981 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
 982                                        void *cb_priv, bool ingress)
 983 {
 984         struct net_device *dev = cb_priv;
 985
 986         if (!tc_can_offload(dev))
 987                 return -EOPNOTSUPP;
 988
 989         switch (type) {
 990         case TC_SETUP_CLSMATCHALL:
 991                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
 992         default:
 993                 return -EOPNOTSUPP;
 994         }
 995 }
 996
 997 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
 998                                           void *type_data, void *cb_priv)
 999 {
1000         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1001 }
1002
1003 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1004                                           void *type_data, void *cb_priv)
1005 {
1006         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1007 }
1008
1009 static LIST_HEAD(dsa_slave_block_cb_list);
1010
1011 static int dsa_slave_setup_tc_block(struct net_device *dev,
1012                                     struct flow_block_offload *f)
1013 {
1014         struct flow_block_cb *block_cb;
1015         flow_setup_cb_t *cb;
1016
1017         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1018                 cb = dsa_slave_setup_tc_block_cb_ig;
1019         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1020                 cb = dsa_slave_setup_tc_block_cb_eg;
1021         else
1022                 return -EOPNOTSUPP;
1023
1024         f->driver_block_list = &dsa_slave_block_cb_list;
1025
1026         switch (f->command) {
1027         case FLOW_BLOCK_BIND:
1028                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1029                         return -EBUSY;
1030
1031                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1032                 if (IS_ERR(block_cb))
1033                         return PTR_ERR(block_cb);
1034
1035                 flow_block_cb_add(block_cb, f);
1036                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1037                 return 0;
1038         case FLOW_BLOCK_UNBIND:
1039                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1040                 if (!block_cb)
1041                         return -ENOENT;
1042
1043                 flow_block_cb_remove(block_cb, f);
1044                 list_del(&block_cb->driver_list);
1045                 return 0;
1046         default:
1047                 return -EOPNOTSUPP;
1048         }
1049 }
1050
1051 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1052                               void *type_data)
1053 {
1054         struct dsa_port *dp = dsa_slave_to_port(dev);
1055         struct dsa_switch *ds = dp->ds;
1056
1057         if (type == TC_SETUP_BLOCK)
1058                 return dsa_slave_setup_tc_block(dev, type_data);
1059
1060         if (!ds->ops->port_setup_tc)
1061                 return -EOPNOTSUPP;
1062
1063         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1064 }
1065
1066 static void dsa_slave_get_stats64(struct net_device *dev,
1067                                   struct rtnl_link_stats64 *stats)
1068 {
1069         struct dsa_slave_priv *p = netdev_priv(dev);
1070         struct pcpu_sw_netstats *s;
1071         unsigned int start;
1072         int i;
1073
1074         netdev_stats_to_stats64(stats, &dev->stats);
1075         for_each_possible_cpu(i) {
1076                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
1077
1078                 s = per_cpu_ptr(p->stats64, i);
1079                 do {
1080                         start = u64_stats_fetch_begin_irq(&s->syncp);
1081                         tx_packets = s->tx_packets;
1082                         tx_bytes = s->tx_bytes;
1083                         rx_packets = s->rx_packets;
1084                         rx_bytes = s->rx_bytes;
1085                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
1086
1087                 stats->tx_packets += tx_packets;
1088                 stats->tx_bytes += tx_bytes;
1089                 stats->rx_packets += rx_packets;
1090                 stats->rx_bytes += rx_bytes;
1091         }
1092 }
1093
1094 static int dsa_slave_get_rxnfc(struct net_device *dev,
1095                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1096 {
1097         struct dsa_port *dp = dsa_slave_to_port(dev);
1098         struct dsa_switch *ds = dp->ds;
1099
1100         if (!ds->ops->get_rxnfc)
1101                 return -EOPNOTSUPP;
1102
1103         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1104 }
1105
1106 static int dsa_slave_set_rxnfc(struct net_device *dev,
1107                                struct ethtool_rxnfc *nfc)
1108 {
1109         struct dsa_port *dp = dsa_slave_to_port(dev);
1110         struct dsa_switch *ds = dp->ds;
1111
1112         if (!ds->ops->set_rxnfc)
1113                 return -EOPNOTSUPP;
1114
1115         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1116 }
1117
1118 static int dsa_slave_get_ts_info(struct net_device *dev,
1119                                  struct ethtool_ts_info *ts)
1120 {
1121         struct dsa_slave_priv *p = netdev_priv(dev);
1122         struct dsa_switch *ds = p->dp->ds;
1123
1124         if (!ds->ops->get_ts_info)
1125                 return -EOPNOTSUPP;
1126
1127         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1128 }
1129
1130 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1131                                      u16 vid)
1132 {
1133         struct dsa_port *dp = dsa_slave_to_port(dev);
1134         struct bridge_vlan_info info;
1135         int ret;
1136
1137         /* Check for a possible bridge VLAN entry now since there is no
1138          * need to emulate the switchdev prepare + commit phase.
1139          */
1140         if (dp->bridge_dev) {
1141                 if (!br_vlan_enabled(dp->bridge_dev))
1142                         return 0;
1143
1144                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1145                  * device, respectively the VID is not found, returning
1146                  * 0 means success, which is a failure for us here.
1147                  */
1148                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1149                 if (ret == 0)
1150                         return -EBUSY;
1151         }
1152
1153         ret = dsa_port_vid_add(dp, vid, 0);
1154         if (ret)
1155                 return ret;
1156
1157         ret = dsa_port_vid_add(dp->cpu_dp, vid, 0);
1158         if (ret)
1159                 return ret;
1160
1161         return 0;
1162 }
1163
1164 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1165                                       u16 vid)
1166 {
1167         struct dsa_port *dp = dsa_slave_to_port(dev);
1168         struct bridge_vlan_info info;
1169         int ret;
1170
1171         /* Check for a possible bridge VLAN entry now since there is no
1172          * need to emulate the switchdev prepare + commit phase.
1173          */
1174         if (dp->bridge_dev) {
1175                 if (!br_vlan_enabled(dp->bridge_dev))
1176                         return 0;
1177
1178                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1179                  * device, respectively the VID is not found, returning
1180                  * 0 means success, which is a failure for us here.
1181                  */
1182                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1183                 if (ret == 0)
1184                         return -EBUSY;
1185         }
1186
1187         /* Do not deprogram the CPU port as it may be shared with other user
1188          * ports which can be members of this VLAN as well.
1189          */
1190         return dsa_port_vid_del(dp, vid);
1191 }
1192
1193 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1194         .get_drvinfo            = dsa_slave_get_drvinfo,
1195         .get_regs_len           = dsa_slave_get_regs_len,
1196         .get_regs               = dsa_slave_get_regs,
1197         .nway_reset             = dsa_slave_nway_reset,
1198         .get_link               = ethtool_op_get_link,
1199         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1200         .get_eeprom             = dsa_slave_get_eeprom,
1201         .set_eeprom             = dsa_slave_set_eeprom,
1202         .get_strings            = dsa_slave_get_strings,
1203         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1204         .get_sset_count         = dsa_slave_get_sset_count,
1205         .set_wol                = dsa_slave_set_wol,
1206         .get_wol                = dsa_slave_get_wol,
1207         .set_eee                = dsa_slave_set_eee,
1208         .get_eee                = dsa_slave_get_eee,
1209         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1210         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1211         .get_pauseparam         = dsa_slave_get_pauseparam,
1212         .set_pauseparam         = dsa_slave_set_pauseparam,
1213         .get_rxnfc              = dsa_slave_get_rxnfc,
1214         .set_rxnfc              = dsa_slave_set_rxnfc,
1215         .get_ts_info            = dsa_slave_get_ts_info,
1216 };
1217
1218 /* legacy way, bypassing the bridge *****************************************/
1219 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1220                        struct net_device *dev,
1221                        const unsigned char *addr, u16 vid,
1222                        u16 flags,
1223                        struct netlink_ext_ack *extack)
1224 {
1225         struct dsa_port *dp = dsa_slave_to_port(dev);
1226
1227         return dsa_port_fdb_add(dp, addr, vid);
1228 }
1229
1230 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1231                        struct net_device *dev,
1232                        const unsigned char *addr, u16 vid)
1233 {
1234         struct dsa_port *dp = dsa_slave_to_port(dev);
1235
1236         return dsa_port_fdb_del(dp, addr, vid);
1237 }
1238
1239 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1240 {
1241         struct dsa_port *dp = dsa_slave_to_port(dev);
1242
1243         return dp->ds->devlink ? &dp->devlink_port : NULL;
1244 }
1245
1246 static const struct net_device_ops dsa_slave_netdev_ops = {
1247         .ndo_open               = dsa_slave_open,
1248         .ndo_stop               = dsa_slave_close,
1249         .ndo_start_xmit         = dsa_slave_xmit,
1250         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1251         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1252         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1253         .ndo_fdb_add            = dsa_legacy_fdb_add,
1254         .ndo_fdb_del            = dsa_legacy_fdb_del,
1255         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1256         .ndo_do_ioctl           = dsa_slave_ioctl,
1257         .ndo_get_iflink         = dsa_slave_get_iflink,
1258 #ifdef CONFIG_NET_POLL_CONTROLLER
1259         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1260         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1261         .ndo_poll_controller    = dsa_slave_poll_controller,
1262 #endif
1263         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1264         .ndo_setup_tc           = dsa_slave_setup_tc,
1265         .ndo_get_stats64        = dsa_slave_get_stats64,
1266         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1267         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1268         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1269         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1270 };
1271
1272 static struct device_type dsa_type = {
1273         .name   = "dsa",
1274 };
1275
1276 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1277 {
1278         const struct dsa_port *dp = dsa_to_port(ds, port);
1279
1280         phylink_mac_change(dp->pl, up);
1281 }
1282 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1283
1284 static void dsa_slave_phylink_fixed_state(struct net_device *dev,
1285                                           struct phylink_link_state *state)
1286 {
1287         struct dsa_port *dp = dsa_slave_to_port(dev);
1288         struct dsa_switch *ds = dp->ds;
1289
1290         /* No need to check that this operation is valid, the callback would
1291          * not be called if it was not.
1292          */
1293         ds->ops->phylink_fixed_state(ds, dp->index, state);
1294 }
1295
1296 /* slave device setup *******************************************************/
1297 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1298 {
1299         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1300         struct dsa_switch *ds = dp->ds;
1301
1302         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1303         if (!slave_dev->phydev) {
1304                 netdev_err(slave_dev, "no phy at %d\n", addr);
1305                 return -ENODEV;
1306         }
1307
1308         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1309 }
1310
1311 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1312 {
1313         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1314         struct device_node *port_dn = dp->dn;
1315         struct dsa_switch *ds = dp->ds;
1316         phy_interface_t mode;
1317         u32 phy_flags = 0;
1318         int ret;
1319
1320         ret = of_get_phy_mode(port_dn, &mode);
1321         if (ret)
1322                 mode = PHY_INTERFACE_MODE_NA;
1323
1324         dp->pl_config.dev = &slave_dev->dev;
1325         dp->pl_config.type = PHYLINK_NETDEV;
1326
1327         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1328                                 &dsa_port_phylink_mac_ops);
1329         if (IS_ERR(dp->pl)) {
1330                 netdev_err(slave_dev,
1331                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1332                 return PTR_ERR(dp->pl);
1333         }
1334
1335         /* Register only if the switch provides such a callback, since this
1336          * callback takes precedence over polling the link GPIO in PHYLINK
1337          * (see phylink_get_fixed_state).
1338          */
1339         if (ds->ops->phylink_fixed_state)
1340                 phylink_fixed_state_cb(dp->pl, dsa_slave_phylink_fixed_state);
1341
1342         if (ds->ops->get_phy_flags)
1343                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1344
1345         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1346         if (ret == -ENODEV && ds->slave_mii_bus) {
1347                 /* We could not connect to a designated PHY or SFP, so try to
1348                  * use the switch internal MDIO bus instead
1349                  */
1350                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1351                 if (ret) {
1352                         netdev_err(slave_dev,
1353                                    "failed to connect to port %d: %d\n",
1354                                    dp->index, ret);
1355                         phylink_destroy(dp->pl);
1356                         return ret;
1357                 }
1358         }
1359
1360         return ret;
1361 }
1362
1363 int dsa_slave_suspend(struct net_device *slave_dev)
1364 {
1365         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1366
1367         if (!netif_running(slave_dev))
1368                 return 0;
1369
1370         cancel_work_sync(&dp->xmit_work);
1371         skb_queue_purge(&dp->xmit_queue);
1372
1373         netif_device_detach(slave_dev);
1374
1375         rtnl_lock();
1376         phylink_stop(dp->pl);
1377         rtnl_unlock();
1378
1379         return 0;
1380 }
1381
1382 int dsa_slave_resume(struct net_device *slave_dev)
1383 {
1384         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1385
1386         if (!netif_running(slave_dev))
1387                 return 0;
1388
1389         netif_device_attach(slave_dev);
1390
1391         rtnl_lock();
1392         phylink_start(dp->pl);
1393         rtnl_unlock();
1394
1395         return 0;
1396 }
1397
1398 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1399 {
1400         struct net_device *master = dsa_slave_to_master(dev);
1401         struct dsa_port *dp = dsa_slave_to_port(dev);
1402         struct dsa_notifier_register_info rinfo = {
1403                 .switch_number = dp->ds->index,
1404                 .port_number = dp->index,
1405                 .master = master,
1406                 .info.dev = dev,
1407         };
1408
1409         call_dsa_notifiers(val, dev, &rinfo.info);
1410 }
1411
1412 int dsa_slave_create(struct dsa_port *port)
1413 {
1414         const struct dsa_port *cpu_dp = port->cpu_dp;
1415         struct net_device *master = cpu_dp->master;
1416         struct dsa_switch *ds = port->ds;
1417         const char *name = port->name;
1418         struct net_device *slave_dev;
1419         struct dsa_slave_priv *p;
1420         int ret;
1421
1422         if (!ds->num_tx_queues)
1423                 ds->num_tx_queues = 1;
1424
1425         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1426                                      NET_NAME_UNKNOWN, ether_setup,
1427                                      ds->num_tx_queues, 1);
1428         if (slave_dev == NULL)
1429                 return -ENOMEM;
1430
1431         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1432         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1433                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1434         slave_dev->hw_features |= NETIF_F_HW_TC;
1435         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1436         if (!IS_ERR_OR_NULL(port->mac))
1437                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1438         else
1439                 eth_hw_addr_inherit(slave_dev, master);
1440         slave_dev->priv_flags |= IFF_NO_QUEUE;
1441         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1442         slave_dev->min_mtu = 0;
1443         slave_dev->max_mtu = ETH_MAX_MTU;
1444         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1445
1446         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1447         slave_dev->dev.of_node = port->dn;
1448         slave_dev->vlan_features = master->vlan_features;
1449
1450         p = netdev_priv(slave_dev);
1451         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1452         if (!p->stats64) {
1453                 free_netdev(slave_dev);
1454                 return -ENOMEM;
1455         }
1456         p->dp = port;
1457         INIT_LIST_HEAD(&p->mall_tc_list);
1458         INIT_WORK(&port->xmit_work, dsa_port_xmit_work);
1459         skb_queue_head_init(&port->xmit_queue);
1460         p->xmit = cpu_dp->tag_ops->xmit;
1461         port->slave = slave_dev;
1462
1463         netif_carrier_off(slave_dev);
1464
1465         ret = dsa_slave_phy_setup(slave_dev);
1466         if (ret) {
1467                 netdev_err(master, "error %d setting up slave phy\n", ret);
1468                 goto out_free;
1469         }
1470
1471         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1472
1473         ret = register_netdev(slave_dev);
1474         if (ret) {
1475                 netdev_err(master, "error %d registering interface %s\n",
1476                            ret, slave_dev->name);
1477                 goto out_phy;
1478         }
1479
1480         return 0;
1481
1482 out_phy:
1483         rtnl_lock();
1484         phylink_disconnect_phy(p->dp->pl);
1485         rtnl_unlock();
1486         phylink_destroy(p->dp->pl);
1487 out_free:
1488         free_percpu(p->stats64);
1489         free_netdev(slave_dev);
1490         port->slave = NULL;
1491         return ret;
1492 }
1493
1494 void dsa_slave_destroy(struct net_device *slave_dev)
1495 {
1496         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1497         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1498
1499         netif_carrier_off(slave_dev);
1500         rtnl_lock();
1501         phylink_disconnect_phy(dp->pl);
1502         rtnl_unlock();
1503
1504         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1505         unregister_netdev(slave_dev);
1506         phylink_destroy(dp->pl);
1507         free_percpu(p->stats64);
1508         free_netdev(slave_dev);
1509 }
1510
1511 static bool dsa_slave_dev_check(const struct net_device *dev)
1512 {
1513         return dev->netdev_ops == &dsa_slave_netdev_ops;
1514 }
1515
1516 static int dsa_slave_changeupper(struct net_device *dev,
1517                                  struct netdev_notifier_changeupper_info *info)
1518 {
1519         struct dsa_port *dp = dsa_slave_to_port(dev);
1520         int err = NOTIFY_DONE;
1521
1522         if (netif_is_bridge_master(info->upper_dev)) {
1523                 if (info->linking) {
1524                         err = dsa_port_bridge_join(dp, info->upper_dev);
1525                         err = notifier_from_errno(err);
1526                 } else {
1527                         dsa_port_bridge_leave(dp, info->upper_dev);
1528                         err = NOTIFY_OK;
1529                 }
1530         }
1531
1532         return err;
1533 }
1534
1535 static int dsa_slave_upper_vlan_check(struct net_device *dev,
1536                                       struct netdev_notifier_changeupper_info *
1537                                       info)
1538 {
1539         struct netlink_ext_ack *ext_ack;
1540         struct net_device *slave;
1541         struct dsa_port *dp;
1542
1543         ext_ack = netdev_notifier_info_to_extack(&info->info);
1544
1545         if (!is_vlan_dev(dev))
1546                 return NOTIFY_DONE;
1547
1548         slave = vlan_dev_real_dev(dev);
1549         if (!dsa_slave_dev_check(slave))
1550                 return NOTIFY_DONE;
1551
1552         dp = dsa_slave_to_port(slave);
1553         if (!dp->bridge_dev)
1554                 return NOTIFY_DONE;
1555
1556         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1557         if (br_vlan_enabled(dp->bridge_dev) &&
1558             netif_is_bridge_master(info->upper_dev) && info->linking) {
1559                 NL_SET_ERR_MSG_MOD(ext_ack,
1560                                    "Cannot enslave VLAN device into VLAN aware bridge");
1561                 return notifier_from_errno(-EINVAL);
1562         }
1563
1564         return NOTIFY_DONE;
1565 }
1566
1567 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1568                                      unsigned long event, void *ptr)
1569 {
1570         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1571
1572         if (event == NETDEV_CHANGEUPPER) {
1573                 if (!dsa_slave_dev_check(dev))
1574                         return dsa_slave_upper_vlan_check(dev, ptr);
1575
1576                 return dsa_slave_changeupper(dev, ptr);
1577         }
1578
1579         return NOTIFY_DONE;
1580 }
1581
1582 struct dsa_switchdev_event_work {
1583         struct work_struct work;
1584         struct switchdev_notifier_fdb_info fdb_info;
1585         struct net_device *dev;
1586         unsigned long event;
1587 };
1588
1589 static void dsa_slave_switchdev_event_work(struct work_struct *work)
1590 {
1591         struct dsa_switchdev_event_work *switchdev_work =
1592                 container_of(work, struct dsa_switchdev_event_work, work);
1593         struct net_device *dev = switchdev_work->dev;
1594         struct switchdev_notifier_fdb_info *fdb_info;
1595         struct dsa_port *dp = dsa_slave_to_port(dev);
1596         int err;
1597
1598         rtnl_lock();
1599         switch (switchdev_work->event) {
1600         case SWITCHDEV_FDB_ADD_TO_DEVICE:
1601                 fdb_info = &switchdev_work->fdb_info;
1602                 if (!fdb_info->added_by_user)
1603                         break;
1604
1605                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
1606                 if (err) {
1607                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
1608                         break;
1609                 }
1610                 fdb_info->offloaded = true;
1611                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
1612                                          &fdb_info->info, NULL);
1613                 break;
1614
1615         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1616                 fdb_info = &switchdev_work->fdb_info;
1617                 if (!fdb_info->added_by_user)
1618                         break;
1619
1620                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
1621                 if (err) {
1622                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
1623                         dev_close(dev);
1624                 }
1625                 break;
1626         }
1627         rtnl_unlock();
1628
1629         kfree(switchdev_work->fdb_info.addr);
1630         kfree(switchdev_work);
1631         dev_put(dev);
1632 }
1633
1634 static int
1635 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
1636                                   switchdev_work,
1637                                   const struct switchdev_notifier_fdb_info *
1638                                   fdb_info)
1639 {
1640         memcpy(&switchdev_work->fdb_info, fdb_info,
1641                sizeof(switchdev_work->fdb_info));
1642         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
1643         if (!switchdev_work->fdb_info.addr)
1644                 return -ENOMEM;
1645         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
1646                         fdb_info->addr);
1647         return 0;
1648 }
1649
1650 /* Called under rcu_read_lock() */
1651 static int dsa_slave_switchdev_event(struct notifier_block *unused,
1652                                      unsigned long event, void *ptr)
1653 {
1654         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1655         struct dsa_switchdev_event_work *switchdev_work;
1656         int err;
1657
1658         if (event == SWITCHDEV_PORT_ATTR_SET) {
1659                 err = switchdev_handle_port_attr_set(dev, ptr,
1660                                                      dsa_slave_dev_check,
1661                                                      dsa_slave_port_attr_set);
1662                 return notifier_from_errno(err);
1663         }
1664
1665         if (!dsa_slave_dev_check(dev))
1666                 return NOTIFY_DONE;
1667
1668         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
1669         if (!switchdev_work)
1670                 return NOTIFY_BAD;
1671
1672         INIT_WORK(&switchdev_work->work,
1673                   dsa_slave_switchdev_event_work);
1674         switchdev_work->dev = dev;
1675         switchdev_work->event = event;
1676
1677         switch (event) {
1678         case SWITCHDEV_FDB_ADD_TO_DEVICE: /* fall through */
1679         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1680                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
1681                         goto err_fdb_work_init;
1682                 dev_hold(dev);
1683                 break;
1684         default:
1685                 kfree(switchdev_work);
1686                 return NOTIFY_DONE;
1687         }
1688
1689         dsa_schedule_work(&switchdev_work->work);
1690         return NOTIFY_OK;
1691
1692 err_fdb_work_init:
1693         kfree(switchdev_work);
1694         return NOTIFY_BAD;
1695 }
1696
1697 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
1698                                               unsigned long event, void *ptr)
1699 {
1700         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1701         int err;
1702
1703         switch (event) {
1704         case SWITCHDEV_PORT_OBJ_ADD:
1705                 err = switchdev_handle_port_obj_add(dev, ptr,
1706                                                     dsa_slave_dev_check,
1707                                                     dsa_slave_port_obj_add);
1708                 return notifier_from_errno(err);
1709         case SWITCHDEV_PORT_OBJ_DEL:
1710                 err = switchdev_handle_port_obj_del(dev, ptr,
1711                                                     dsa_slave_dev_check,
1712                                                     dsa_slave_port_obj_del);
1713                 return notifier_from_errno(err);
1714         case SWITCHDEV_PORT_ATTR_SET:
1715                 err = switchdev_handle_port_attr_set(dev, ptr,
1716                                                      dsa_slave_dev_check,
1717                                                      dsa_slave_port_attr_set);
1718                 return notifier_from_errno(err);
1719         }
1720
1721         return NOTIFY_DONE;
1722 }
1723
1724 static struct notifier_block dsa_slave_nb __read_mostly = {
1725         .notifier_call  = dsa_slave_netdevice_event,
1726 };
1727
1728 static struct notifier_block dsa_slave_switchdev_notifier = {
1729         .notifier_call = dsa_slave_switchdev_event,
1730 };
1731
1732 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
1733         .notifier_call = dsa_slave_switchdev_blocking_event,
1734 };
1735
1736 int dsa_slave_register_notifier(void)
1737 {
1738         struct notifier_block *nb;
1739         int err;
1740
1741         err = register_netdevice_notifier(&dsa_slave_nb);
1742         if (err)
1743                 return err;
1744
1745         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
1746         if (err)
1747                 goto err_switchdev_nb;
1748
1749         nb = &dsa_slave_switchdev_blocking_notifier;
1750         err = register_switchdev_blocking_notifier(nb);
1751         if (err)
1752                 goto err_switchdev_blocking_nb;
1753
1754         return 0;
1755
1756 err_switchdev_blocking_nb:
1757         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
1758 err_switchdev_nb:
1759         unregister_netdevice_notifier(&dsa_slave_nb);
1760         return err;
1761 }
1762
1763 void dsa_slave_unregister_notifier(void)
1764 {
1765         struct notifier_block *nb;
1766         int err;
1767
1768         nb = &dsa_slave_switchdev_blocking_notifier;
1769         err = unregister_switchdev_blocking_notifier(nb);
1770         if (err)
1771                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
1772
1773         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
1774         if (err)
1775                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
1776
1777         err = unregister_netdevice_notifier(&dsa_slave_nb);
1778         if (err)
1779                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
1780 }