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 #ifdef CONFIG_NET_POLL_CONTROLLER
 793 static int dsa_slave_netpoll_setup(struct net_device *dev,
 794                                    struct netpoll_info *ni)
 795 {
 796         struct net_device *master = dsa_slave_to_master(dev);
 797         struct dsa_slave_priv *p = netdev_priv(dev);
 798         struct netpoll *netpoll;
 799         int err = 0;
 800
 801         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 802         if (!netpoll)
 803                 return -ENOMEM;
 804
 805         err = __netpoll_setup(netpoll, master);
 806         if (err) {
 807                 kfree(netpoll);
 808                 goto out;
 809         }
 810
 811         p->netpoll = netpoll;
 812 out:
 813         return err;
 814 }
 815
 816 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 817 {
 818         struct dsa_slave_priv *p = netdev_priv(dev);
 819         struct netpoll *netpoll = p->netpoll;
 820
 821         if (!netpoll)
 822                 return;
 823
 824         p->netpoll = NULL;
 825
 826         __netpoll_free(netpoll);
 827 }
 828
 829 static void dsa_slave_poll_controller(struct net_device *dev)
 830 {
 831 }
 832 #endif
 833
 834 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 835                                         char *name, size_t len)
 836 {
 837         struct dsa_port *dp = dsa_slave_to_port(dev);
 838
 839         /* For non-legacy ports, devlink is used and it takes
 840          * care of the name generation. This ndo implementation
 841          * should be removed with legacy support.
 842          */
 843         if (dp->ds->devlink)
 844                 return -EOPNOTSUPP;
 845
 846         if (snprintf(name, len, "p%d", dp->index) >= len)
 847                 return -EINVAL;
 848
 849         return 0;
 850 }
 851
 852 static struct dsa_mall_tc_entry *
 853 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 854 {
 855         struct dsa_slave_priv *p = netdev_priv(dev);
 856         struct dsa_mall_tc_entry *mall_tc_entry;
 857
 858         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 859                 if (mall_tc_entry->cookie == cookie)
 860                         return mall_tc_entry;
 861
 862         return NULL;
 863 }
 864
 865 static int dsa_slave_add_cls_matchall(struct net_device *dev,
 866                                       struct tc_cls_matchall_offload *cls,
 867                                       bool ingress)
 868 {
 869         struct dsa_port *dp = dsa_slave_to_port(dev);
 870         struct dsa_slave_priv *p = netdev_priv(dev);
 871         struct dsa_mall_tc_entry *mall_tc_entry;
 872         __be16 protocol = cls->common.protocol;
 873         struct dsa_switch *ds = dp->ds;
 874         struct flow_action_entry *act;
 875         struct dsa_port *to_dp;
 876         int err = -EOPNOTSUPP;
 877
 878         if (!ds->ops->port_mirror_add)
 879                 return err;
 880
 881         if (!flow_offload_has_one_action(&cls->rule->action))
 882                 return err;
 883
 884         act = &cls->rule->action.entries[0];
 885
 886         if (act->id == FLOW_ACTION_MIRRED && protocol == htons(ETH_P_ALL)) {
 887                 struct dsa_mall_mirror_tc_entry *mirror;
 888
 889                 if (!act->dev)
 890                         return -EINVAL;
 891
 892                 if (!dsa_slave_dev_check(act->dev))
 893                         return -EOPNOTSUPP;
 894
 895                 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 896                 if (!mall_tc_entry)
 897                         return -ENOMEM;
 898
 899                 mall_tc_entry->cookie = cls->cookie;
 900                 mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 901                 mirror = &mall_tc_entry->mirror;
 902
 903                 to_dp = dsa_slave_to_port(act->dev);
 904
 905                 mirror->to_local_port = to_dp->index;
 906                 mirror->ingress = ingress;
 907
 908                 err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 909                 if (err) {
 910                         kfree(mall_tc_entry);
 911                         return err;
 912                 }
 913
 914                 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 915         }
 916
 917         return 0;
 918 }
 919
 920 static void dsa_slave_del_cls_matchall(struct net_device *dev,
 921                                        struct tc_cls_matchall_offload *cls)
 922 {
 923         struct dsa_port *dp = dsa_slave_to_port(dev);
 924         struct dsa_mall_tc_entry *mall_tc_entry;
 925         struct dsa_switch *ds = dp->ds;
 926
 927         if (!ds->ops->port_mirror_del)
 928                 return;
 929
 930         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
 931         if (!mall_tc_entry)
 932                 return;
 933
 934         list_del(&mall_tc_entry->list);
 935
 936         switch (mall_tc_entry->type) {
 937         case DSA_PORT_MALL_MIRROR:
 938                 ds->ops->port_mirror_del(ds, dp->index, &mall_tc_entry->mirror);
 939                 break;
 940         default:
 941                 WARN_ON(1);
 942         }
 943
 944         kfree(mall_tc_entry);
 945 }
 946
 947 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
 948                                            struct tc_cls_matchall_offload *cls,
 949                                            bool ingress)
 950 {
 951         if (cls->common.chain_index)
 952                 return -EOPNOTSUPP;
 953
 954         switch (cls->command) {
 955         case TC_CLSMATCHALL_REPLACE:
 956                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
 957         case TC_CLSMATCHALL_DESTROY:
 958                 dsa_slave_del_cls_matchall(dev, cls);
 959                 return 0;
 960         default:
 961                 return -EOPNOTSUPP;
 962         }
 963 }
 964
 965 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
 966                                        void *cb_priv, bool ingress)
 967 {
 968         struct net_device *dev = cb_priv;
 969
 970         if (!tc_can_offload(dev))
 971                 return -EOPNOTSUPP;
 972
 973         switch (type) {
 974         case TC_SETUP_CLSMATCHALL:
 975                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
 976         default:
 977                 return -EOPNOTSUPP;
 978         }
 979 }
 980
 981 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
 982                                           void *type_data, void *cb_priv)
 983 {
 984         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
 985 }
 986
 987 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
 988                                           void *type_data, void *cb_priv)
 989 {
 990         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
 991 }
 992
 993 static LIST_HEAD(dsa_slave_block_cb_list);
 994
 995 static int dsa_slave_setup_tc_block(struct net_device *dev,
 996                                     struct flow_block_offload *f)
 997 {
 998         struct flow_block_cb *block_cb;
 999         flow_setup_cb_t *cb;
1000
1001         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1002                 cb = dsa_slave_setup_tc_block_cb_ig;
1003         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1004                 cb = dsa_slave_setup_tc_block_cb_eg;
1005         else
1006                 return -EOPNOTSUPP;
1007
1008         f->driver_block_list = &dsa_slave_block_cb_list;
1009
1010         switch (f->command) {
1011         case FLOW_BLOCK_BIND:
1012                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1013                         return -EBUSY;
1014
1015                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1016                 if (IS_ERR(block_cb))
1017                         return PTR_ERR(block_cb);
1018
1019                 flow_block_cb_add(block_cb, f);
1020                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1021                 return 0;
1022         case FLOW_BLOCK_UNBIND:
1023                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1024                 if (!block_cb)
1025                         return -ENOENT;
1026
1027                 flow_block_cb_remove(block_cb, f);
1028                 list_del(&block_cb->driver_list);
1029                 return 0;
1030         default:
1031                 return -EOPNOTSUPP;
1032         }
1033 }
1034
1035 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1036                               void *type_data)
1037 {
1038         struct dsa_port *dp = dsa_slave_to_port(dev);
1039         struct dsa_switch *ds = dp->ds;
1040
1041         if (type == TC_SETUP_BLOCK)
1042                 return dsa_slave_setup_tc_block(dev, type_data);
1043
1044         if (!ds->ops->port_setup_tc)
1045                 return -EOPNOTSUPP;
1046
1047         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1048 }
1049
1050 static void dsa_slave_get_stats64(struct net_device *dev,
1051                                   struct rtnl_link_stats64 *stats)
1052 {
1053         struct dsa_slave_priv *p = netdev_priv(dev);
1054         struct pcpu_sw_netstats *s;
1055         unsigned int start;
1056         int i;
1057
1058         netdev_stats_to_stats64(stats, &dev->stats);
1059         for_each_possible_cpu(i) {
1060                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
1061
1062                 s = per_cpu_ptr(p->stats64, i);
1063                 do {
1064                         start = u64_stats_fetch_begin_irq(&s->syncp);
1065                         tx_packets = s->tx_packets;
1066                         tx_bytes = s->tx_bytes;
1067                         rx_packets = s->rx_packets;
1068                         rx_bytes = s->rx_bytes;
1069                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
1070
1071                 stats->tx_packets += tx_packets;
1072                 stats->tx_bytes += tx_bytes;
1073                 stats->rx_packets += rx_packets;
1074                 stats->rx_bytes += rx_bytes;
1075         }
1076 }
1077
1078 static int dsa_slave_get_rxnfc(struct net_device *dev,
1079                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1080 {
1081         struct dsa_port *dp = dsa_slave_to_port(dev);
1082         struct dsa_switch *ds = dp->ds;
1083
1084         if (!ds->ops->get_rxnfc)
1085                 return -EOPNOTSUPP;
1086
1087         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1088 }
1089
1090 static int dsa_slave_set_rxnfc(struct net_device *dev,
1091                                struct ethtool_rxnfc *nfc)
1092 {
1093         struct dsa_port *dp = dsa_slave_to_port(dev);
1094         struct dsa_switch *ds = dp->ds;
1095
1096         if (!ds->ops->set_rxnfc)
1097                 return -EOPNOTSUPP;
1098
1099         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1100 }
1101
1102 static int dsa_slave_get_ts_info(struct net_device *dev,
1103                                  struct ethtool_ts_info *ts)
1104 {
1105         struct dsa_slave_priv *p = netdev_priv(dev);
1106         struct dsa_switch *ds = p->dp->ds;
1107
1108         if (!ds->ops->get_ts_info)
1109                 return -EOPNOTSUPP;
1110
1111         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1112 }
1113
1114 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1115                                      u16 vid)
1116 {
1117         struct dsa_port *dp = dsa_slave_to_port(dev);
1118         struct bridge_vlan_info info;
1119         int ret;
1120
1121         /* Check for a possible bridge VLAN entry now since there is no
1122          * need to emulate the switchdev prepare + commit phase.
1123          */
1124         if (dp->bridge_dev) {
1125                 if (!br_vlan_enabled(dp->bridge_dev))
1126                         return 0;
1127
1128                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1129                  * device, respectively the VID is not found, returning
1130                  * 0 means success, which is a failure for us here.
1131                  */
1132                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1133                 if (ret == 0)
1134                         return -EBUSY;
1135         }
1136
1137         ret = dsa_port_vid_add(dp, vid, 0);
1138         if (ret)
1139                 return ret;
1140
1141         ret = dsa_port_vid_add(dp->cpu_dp, vid, 0);
1142         if (ret)
1143                 return ret;
1144
1145         return 0;
1146 }
1147
1148 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1149                                       u16 vid)
1150 {
1151         struct dsa_port *dp = dsa_slave_to_port(dev);
1152         struct bridge_vlan_info info;
1153         int ret;
1154
1155         /* Check for a possible bridge VLAN entry now since there is no
1156          * need to emulate the switchdev prepare + commit phase.
1157          */
1158         if (dp->bridge_dev) {
1159                 if (!br_vlan_enabled(dp->bridge_dev))
1160                         return 0;
1161
1162                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1163                  * device, respectively the VID is not found, returning
1164                  * 0 means success, which is a failure for us here.
1165                  */
1166                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1167                 if (ret == 0)
1168                         return -EBUSY;
1169         }
1170
1171         /* Do not deprogram the CPU port as it may be shared with other user
1172          * ports which can be members of this VLAN as well.
1173          */
1174         return dsa_port_vid_del(dp, vid);
1175 }
1176
1177 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1178         .get_drvinfo            = dsa_slave_get_drvinfo,
1179         .get_regs_len           = dsa_slave_get_regs_len,
1180         .get_regs               = dsa_slave_get_regs,
1181         .nway_reset             = dsa_slave_nway_reset,
1182         .get_link               = ethtool_op_get_link,
1183         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1184         .get_eeprom             = dsa_slave_get_eeprom,
1185         .set_eeprom             = dsa_slave_set_eeprom,
1186         .get_strings            = dsa_slave_get_strings,
1187         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1188         .get_sset_count         = dsa_slave_get_sset_count,
1189         .set_wol                = dsa_slave_set_wol,
1190         .get_wol                = dsa_slave_get_wol,
1191         .set_eee                = dsa_slave_set_eee,
1192         .get_eee                = dsa_slave_get_eee,
1193         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1194         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1195         .get_rxnfc              = dsa_slave_get_rxnfc,
1196         .set_rxnfc              = dsa_slave_set_rxnfc,
1197         .get_ts_info            = dsa_slave_get_ts_info,
1198 };
1199
1200 /* legacy way, bypassing the bridge *****************************************/
1201 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1202                        struct net_device *dev,
1203                        const unsigned char *addr, u16 vid,
1204                        u16 flags,
1205                        struct netlink_ext_ack *extack)
1206 {
1207         struct dsa_port *dp = dsa_slave_to_port(dev);
1208
1209         return dsa_port_fdb_add(dp, addr, vid);
1210 }
1211
1212 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1213                        struct net_device *dev,
1214                        const unsigned char *addr, u16 vid)
1215 {
1216         struct dsa_port *dp = dsa_slave_to_port(dev);
1217
1218         return dsa_port_fdb_del(dp, addr, vid);
1219 }
1220
1221 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1222 {
1223         struct dsa_port *dp = dsa_slave_to_port(dev);
1224
1225         return dp->ds->devlink ? &dp->devlink_port : NULL;
1226 }
1227
1228 static const struct net_device_ops dsa_slave_netdev_ops = {
1229         .ndo_open               = dsa_slave_open,
1230         .ndo_stop               = dsa_slave_close,
1231         .ndo_start_xmit         = dsa_slave_xmit,
1232         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1233         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1234         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1235         .ndo_fdb_add            = dsa_legacy_fdb_add,
1236         .ndo_fdb_del            = dsa_legacy_fdb_del,
1237         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1238         .ndo_do_ioctl           = dsa_slave_ioctl,
1239         .ndo_get_iflink         = dsa_slave_get_iflink,
1240 #ifdef CONFIG_NET_POLL_CONTROLLER
1241         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1242         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1243         .ndo_poll_controller    = dsa_slave_poll_controller,
1244 #endif
1245         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1246         .ndo_setup_tc           = dsa_slave_setup_tc,
1247         .ndo_get_stats64        = dsa_slave_get_stats64,
1248         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1249         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1250         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1251         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1252 };
1253
1254 static struct device_type dsa_type = {
1255         .name   = "dsa",
1256 };
1257
1258 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1259 {
1260         const struct dsa_port *dp = dsa_to_port(ds, port);
1261
1262         phylink_mac_change(dp->pl, up);
1263 }
1264 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1265
1266 static void dsa_slave_phylink_fixed_state(struct net_device *dev,
1267                                           struct phylink_link_state *state)
1268 {
1269         struct dsa_port *dp = dsa_slave_to_port(dev);
1270         struct dsa_switch *ds = dp->ds;
1271
1272         /* No need to check that this operation is valid, the callback would
1273          * not be called if it was not.
1274          */
1275         ds->ops->phylink_fixed_state(ds, dp->index, state);
1276 }
1277
1278 /* slave device setup *******************************************************/
1279 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1280 {
1281         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1282         struct dsa_switch *ds = dp->ds;
1283
1284         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1285         if (!slave_dev->phydev) {
1286                 netdev_err(slave_dev, "no phy at %d\n", addr);
1287                 return -ENODEV;
1288         }
1289
1290         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1291 }
1292
1293 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1294 {
1295         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1296         struct device_node *port_dn = dp->dn;
1297         struct dsa_switch *ds = dp->ds;
1298         u32 phy_flags = 0;
1299         int mode, ret;
1300
1301         mode = of_get_phy_mode(port_dn);
1302         if (mode < 0)
1303                 mode = PHY_INTERFACE_MODE_NA;
1304
1305         dp->pl_config.dev = &slave_dev->dev;
1306         dp->pl_config.type = PHYLINK_NETDEV;
1307
1308         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1309                                 &dsa_port_phylink_mac_ops);
1310         if (IS_ERR(dp->pl)) {
1311                 netdev_err(slave_dev,
1312                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1313                 return PTR_ERR(dp->pl);
1314         }
1315
1316         /* Register only if the switch provides such a callback, since this
1317          * callback takes precedence over polling the link GPIO in PHYLINK
1318          * (see phylink_get_fixed_state).
1319          */
1320         if (ds->ops->phylink_fixed_state)
1321                 phylink_fixed_state_cb(dp->pl, dsa_slave_phylink_fixed_state);
1322
1323         if (ds->ops->get_phy_flags)
1324                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1325
1326         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1327         if (ret == -ENODEV && ds->slave_mii_bus) {
1328                 /* We could not connect to a designated PHY or SFP, so try to
1329                  * use the switch internal MDIO bus instead
1330                  */
1331                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1332                 if (ret) {
1333                         netdev_err(slave_dev,
1334                                    "failed to connect to port %d: %d\n",
1335                                    dp->index, ret);
1336                         phylink_destroy(dp->pl);
1337                         return ret;
1338                 }
1339         }
1340
1341         return ret;
1342 }
1343
1344 int dsa_slave_suspend(struct net_device *slave_dev)
1345 {
1346         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1347
1348         if (!netif_running(slave_dev))
1349                 return 0;
1350
1351         cancel_work_sync(&dp->xmit_work);
1352         skb_queue_purge(&dp->xmit_queue);
1353
1354         netif_device_detach(slave_dev);
1355
1356         rtnl_lock();
1357         phylink_stop(dp->pl);
1358         rtnl_unlock();
1359
1360         return 0;
1361 }
1362
1363 int dsa_slave_resume(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         netif_device_attach(slave_dev);
1371
1372         rtnl_lock();
1373         phylink_start(dp->pl);
1374         rtnl_unlock();
1375
1376         return 0;
1377 }
1378
1379 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1380 {
1381         struct net_device *master = dsa_slave_to_master(dev);
1382         struct dsa_port *dp = dsa_slave_to_port(dev);
1383         struct dsa_notifier_register_info rinfo = {
1384                 .switch_number = dp->ds->index,
1385                 .port_number = dp->index,
1386                 .master = master,
1387                 .info.dev = dev,
1388         };
1389
1390         call_dsa_notifiers(val, dev, &rinfo.info);
1391 }
1392
1393 int dsa_slave_create(struct dsa_port *port)
1394 {
1395         const struct dsa_port *cpu_dp = port->cpu_dp;
1396         struct net_device *master = cpu_dp->master;
1397         struct dsa_switch *ds = port->ds;
1398         const char *name = port->name;
1399         struct net_device *slave_dev;
1400         struct dsa_slave_priv *p;
1401         int ret;
1402
1403         if (!ds->num_tx_queues)
1404                 ds->num_tx_queues = 1;
1405
1406         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1407                                      NET_NAME_UNKNOWN, ether_setup,
1408                                      ds->num_tx_queues, 1);
1409         if (slave_dev == NULL)
1410                 return -ENOMEM;
1411
1412         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1413         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1414                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1415         slave_dev->hw_features |= NETIF_F_HW_TC;
1416         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1417         if (!IS_ERR_OR_NULL(port->mac))
1418                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1419         else
1420                 eth_hw_addr_inherit(slave_dev, master);
1421         slave_dev->priv_flags |= IFF_NO_QUEUE;
1422         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1423         slave_dev->min_mtu = 0;
1424         slave_dev->max_mtu = ETH_MAX_MTU;
1425         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1426
1427         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1428         slave_dev->dev.of_node = port->dn;
1429         slave_dev->vlan_features = master->vlan_features;
1430
1431         p = netdev_priv(slave_dev);
1432         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1433         if (!p->stats64) {
1434                 free_netdev(slave_dev);
1435                 return -ENOMEM;
1436         }
1437         p->dp = port;
1438         INIT_LIST_HEAD(&p->mall_tc_list);
1439         INIT_WORK(&port->xmit_work, dsa_port_xmit_work);
1440         skb_queue_head_init(&port->xmit_queue);
1441         p->xmit = cpu_dp->tag_ops->xmit;
1442         port->slave = slave_dev;
1443
1444         netif_carrier_off(slave_dev);
1445
1446         ret = dsa_slave_phy_setup(slave_dev);
1447         if (ret) {
1448                 netdev_err(master, "error %d setting up slave phy\n", ret);
1449                 goto out_free;
1450         }
1451
1452         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1453
1454         ret = register_netdev(slave_dev);
1455         if (ret) {
1456                 netdev_err(master, "error %d registering interface %s\n",
1457                            ret, slave_dev->name);
1458                 goto out_phy;
1459         }
1460
1461         return 0;
1462
1463 out_phy:
1464         rtnl_lock();
1465         phylink_disconnect_phy(p->dp->pl);
1466         rtnl_unlock();
1467         phylink_destroy(p->dp->pl);
1468 out_free:
1469         free_percpu(p->stats64);
1470         free_netdev(slave_dev);
1471         port->slave = NULL;
1472         return ret;
1473 }
1474
1475 void dsa_slave_destroy(struct net_device *slave_dev)
1476 {
1477         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1478         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1479
1480         netif_carrier_off(slave_dev);
1481         rtnl_lock();
1482         phylink_disconnect_phy(dp->pl);
1483         rtnl_unlock();
1484
1485         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1486         unregister_netdev(slave_dev);
1487         phylink_destroy(dp->pl);
1488         free_percpu(p->stats64);
1489         free_netdev(slave_dev);
1490 }
1491
1492 static bool dsa_slave_dev_check(const struct net_device *dev)
1493 {
1494         return dev->netdev_ops == &dsa_slave_netdev_ops;
1495 }
1496
1497 static int dsa_slave_changeupper(struct net_device *dev,
1498                                  struct netdev_notifier_changeupper_info *info)
1499 {
1500         struct dsa_port *dp = dsa_slave_to_port(dev);
1501         int err = NOTIFY_DONE;
1502
1503         if (netif_is_bridge_master(info->upper_dev)) {
1504                 if (info->linking) {
1505                         err = dsa_port_bridge_join(dp, info->upper_dev);
1506                         err = notifier_from_errno(err);
1507                 } else {
1508                         dsa_port_bridge_leave(dp, info->upper_dev);
1509                         err = NOTIFY_OK;
1510                 }
1511         }
1512
1513         return err;
1514 }
1515
1516 static int dsa_slave_upper_vlan_check(struct net_device *dev,
1517                                       struct netdev_notifier_changeupper_info *
1518                                       info)
1519 {
1520         struct netlink_ext_ack *ext_ack;
1521         struct net_device *slave;
1522         struct dsa_port *dp;
1523
1524         ext_ack = netdev_notifier_info_to_extack(&info->info);
1525
1526         if (!is_vlan_dev(dev))
1527                 return NOTIFY_DONE;
1528
1529         slave = vlan_dev_real_dev(dev);
1530         if (!dsa_slave_dev_check(slave))
1531                 return NOTIFY_DONE;
1532
1533         dp = dsa_slave_to_port(slave);
1534         if (!dp->bridge_dev)
1535                 return NOTIFY_DONE;
1536
1537         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1538         if (br_vlan_enabled(dp->bridge_dev) &&
1539             netif_is_bridge_master(info->upper_dev) && info->linking) {
1540                 NL_SET_ERR_MSG_MOD(ext_ack,
1541                                    "Cannot enslave VLAN device into VLAN aware bridge");
1542                 return notifier_from_errno(-EINVAL);
1543         }
1544
1545         return NOTIFY_DONE;
1546 }
1547
1548 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1549                                      unsigned long event, void *ptr)
1550 {
1551         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1552
1553         if (event == NETDEV_CHANGEUPPER) {
1554                 if (!dsa_slave_dev_check(dev))
1555                         return dsa_slave_upper_vlan_check(dev, ptr);
1556
1557                 return dsa_slave_changeupper(dev, ptr);
1558         }
1559
1560         return NOTIFY_DONE;
1561 }
1562
1563 struct dsa_switchdev_event_work {
1564         struct work_struct work;
1565         struct switchdev_notifier_fdb_info fdb_info;
1566         struct net_device *dev;
1567         unsigned long event;
1568 };
1569
1570 static void dsa_slave_switchdev_event_work(struct work_struct *work)
1571 {
1572         struct dsa_switchdev_event_work *switchdev_work =
1573                 container_of(work, struct dsa_switchdev_event_work, work);
1574         struct net_device *dev = switchdev_work->dev;
1575         struct switchdev_notifier_fdb_info *fdb_info;
1576         struct dsa_port *dp = dsa_slave_to_port(dev);
1577         int err;
1578
1579         rtnl_lock();
1580         switch (switchdev_work->event) {
1581         case SWITCHDEV_FDB_ADD_TO_DEVICE:
1582                 fdb_info = &switchdev_work->fdb_info;
1583                 if (!fdb_info->added_by_user)
1584                         break;
1585
1586                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
1587                 if (err) {
1588                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
1589                         break;
1590                 }
1591                 fdb_info->offloaded = true;
1592                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
1593                                          &fdb_info->info, NULL);
1594                 break;
1595
1596         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1597                 fdb_info = &switchdev_work->fdb_info;
1598                 if (!fdb_info->added_by_user)
1599                         break;
1600
1601                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
1602                 if (err) {
1603                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
1604                         dev_close(dev);
1605                 }
1606                 break;
1607         }
1608         rtnl_unlock();
1609
1610         kfree(switchdev_work->fdb_info.addr);
1611         kfree(switchdev_work);
1612         dev_put(dev);
1613 }
1614
1615 static int
1616 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
1617                                   switchdev_work,
1618                                   const struct switchdev_notifier_fdb_info *
1619                                   fdb_info)
1620 {
1621         memcpy(&switchdev_work->fdb_info, fdb_info,
1622                sizeof(switchdev_work->fdb_info));
1623         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
1624         if (!switchdev_work->fdb_info.addr)
1625                 return -ENOMEM;
1626         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
1627                         fdb_info->addr);
1628         return 0;
1629 }
1630
1631 /* Called under rcu_read_lock() */
1632 static int dsa_slave_switchdev_event(struct notifier_block *unused,
1633                                      unsigned long event, void *ptr)
1634 {
1635         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1636         struct dsa_switchdev_event_work *switchdev_work;
1637         int err;
1638
1639         if (event == SWITCHDEV_PORT_ATTR_SET) {
1640                 err = switchdev_handle_port_attr_set(dev, ptr,
1641                                                      dsa_slave_dev_check,
1642                                                      dsa_slave_port_attr_set);
1643                 return notifier_from_errno(err);
1644         }
1645
1646         if (!dsa_slave_dev_check(dev))
1647                 return NOTIFY_DONE;
1648
1649         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
1650         if (!switchdev_work)
1651                 return NOTIFY_BAD;
1652
1653         INIT_WORK(&switchdev_work->work,
1654                   dsa_slave_switchdev_event_work);
1655         switchdev_work->dev = dev;
1656         switchdev_work->event = event;
1657
1658         switch (event) {
1659         case SWITCHDEV_FDB_ADD_TO_DEVICE: /* fall through */
1660         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1661                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
1662                         goto err_fdb_work_init;
1663                 dev_hold(dev);
1664                 break;
1665         default:
1666                 kfree(switchdev_work);
1667                 return NOTIFY_DONE;
1668         }
1669
1670         dsa_schedule_work(&switchdev_work->work);
1671         return NOTIFY_OK;
1672
1673 err_fdb_work_init:
1674         kfree(switchdev_work);
1675         return NOTIFY_BAD;
1676 }
1677
1678 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
1679                                               unsigned long event, void *ptr)
1680 {
1681         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1682         int err;
1683
1684         switch (event) {
1685         case SWITCHDEV_PORT_OBJ_ADD:
1686                 err = switchdev_handle_port_obj_add(dev, ptr,
1687                                                     dsa_slave_dev_check,
1688                                                     dsa_slave_port_obj_add);
1689                 return notifier_from_errno(err);
1690         case SWITCHDEV_PORT_OBJ_DEL:
1691                 err = switchdev_handle_port_obj_del(dev, ptr,
1692                                                     dsa_slave_dev_check,
1693                                                     dsa_slave_port_obj_del);
1694                 return notifier_from_errno(err);
1695         case SWITCHDEV_PORT_ATTR_SET:
1696                 err = switchdev_handle_port_attr_set(dev, ptr,
1697                                                      dsa_slave_dev_check,
1698                                                      dsa_slave_port_attr_set);
1699                 return notifier_from_errno(err);
1700         }
1701
1702         return NOTIFY_DONE;
1703 }
1704
1705 static struct notifier_block dsa_slave_nb __read_mostly = {
1706         .notifier_call  = dsa_slave_netdevice_event,
1707 };
1708
1709 static struct notifier_block dsa_slave_switchdev_notifier = {
1710         .notifier_call = dsa_slave_switchdev_event,
1711 };
1712
1713 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
1714         .notifier_call = dsa_slave_switchdev_blocking_event,
1715 };
1716
1717 int dsa_slave_register_notifier(void)
1718 {
1719         struct notifier_block *nb;
1720         int err;
1721
1722         err = register_netdevice_notifier(&dsa_slave_nb);
1723         if (err)
1724                 return err;
1725
1726         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
1727         if (err)
1728                 goto err_switchdev_nb;
1729
1730         nb = &dsa_slave_switchdev_blocking_notifier;
1731         err = register_switchdev_blocking_notifier(nb);
1732         if (err)
1733                 goto err_switchdev_blocking_nb;
1734
1735         return 0;
1736
1737 err_switchdev_blocking_nb:
1738         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
1739 err_switchdev_nb:
1740         unregister_netdevice_notifier(&dsa_slave_nb);
1741         return err;
1742 }
1743
1744 void dsa_slave_unregister_notifier(void)
1745 {
1746         struct notifier_block *nb;
1747         int err;
1748
1749         nb = &dsa_slave_switchdev_blocking_notifier;
1750         err = unregister_switchdev_blocking_notifier(nb);
1751         if (err)
1752                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
1753
1754         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
1755         if (err)
1756                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
1757
1758         err = unregister_netdevice_notifier(&dsa_slave_nb);
1759         if (err)
1760                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
1761 }