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         default:
 305                 ret = -EOPNOTSUPP;
 306                 break;
 307         }
 308
 309         return ret;
 310 }
 311
 312 static int dsa_slave_port_obj_add(struct net_device *dev,
 313                                   const struct switchdev_obj *obj,
 314                                   struct switchdev_trans *trans,
 315                                   struct netlink_ext_ack *extack)
 316 {
 317         struct dsa_port *dp = dsa_slave_to_port(dev);
 318         int err;
 319
 320         /* For the prepare phase, ensure the full set of changes is feasable in
 321          * one go in order to signal a failure properly. If an operation is not
 322          * supported, return -EOPNOTSUPP.
 323          */
 324
 325         switch (obj->id) {
 326         case SWITCHDEV_OBJ_ID_PORT_MDB:
 327                 if (obj->orig_dev != dev)
 328                         return -EOPNOTSUPP;
 329                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 330                 break;
 331         case SWITCHDEV_OBJ_ID_HOST_MDB:
 332                 /* DSA can directly translate this to a normal MDB add,
 333                  * but on the CPU port.
 334                  */
 335                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj),
 336                                        trans);
 337                 break;
 338         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 339                 if (obj->orig_dev != dev)
 340                         return -EOPNOTSUPP;
 341                 err = dsa_port_vlan_add(dp, SWITCHDEV_OBJ_PORT_VLAN(obj),
 342                                         trans);
 343                 break;
 344         default:
 345                 err = -EOPNOTSUPP;
 346                 break;
 347         }
 348
 349         return err;
 350 }
 351
 352 static int dsa_slave_port_obj_del(struct net_device *dev,
 353                                   const struct switchdev_obj *obj)
 354 {
 355         struct dsa_port *dp = dsa_slave_to_port(dev);
 356         int err;
 357
 358         switch (obj->id) {
 359         case SWITCHDEV_OBJ_ID_PORT_MDB:
 360                 if (obj->orig_dev != dev)
 361                         return -EOPNOTSUPP;
 362                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 363                 break;
 364         case SWITCHDEV_OBJ_ID_HOST_MDB:
 365                 /* DSA can directly translate this to a normal MDB add,
 366                  * but on the CPU port.
 367                  */
 368                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 369                 break;
 370         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 371                 if (obj->orig_dev != dev)
 372                         return -EOPNOTSUPP;
 373                 err = dsa_port_vlan_del(dp, SWITCHDEV_OBJ_PORT_VLAN(obj));
 374                 break;
 375         default:
 376                 err = -EOPNOTSUPP;
 377                 break;
 378         }
 379
 380         return err;
 381 }
 382
 383 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 384                                         struct netdev_phys_item_id *ppid)
 385 {
 386         struct dsa_port *dp = dsa_slave_to_port(dev);
 387         struct dsa_switch *ds = dp->ds;
 388         struct dsa_switch_tree *dst = ds->dst;
 389
 390         /* For non-legacy ports, devlink is used and it takes
 391          * care of the name generation. This ndo implementation
 392          * should be removed with legacy support.
 393          */
 394         if (dp->ds->devlink)
 395                 return -EOPNOTSUPP;
 396
 397         ppid->id_len = sizeof(dst->index);
 398         memcpy(&ppid->id, &dst->index, ppid->id_len);
 399
 400         return 0;
 401 }
 402
 403 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 404                                                      struct sk_buff *skb)
 405 {
 406 #ifdef CONFIG_NET_POLL_CONTROLLER
 407         struct dsa_slave_priv *p = netdev_priv(dev);
 408
 409         if (p->netpoll)
 410                 netpoll_send_skb(p->netpoll, skb);
 411 #else
 412         BUG();
 413 #endif
 414         return NETDEV_TX_OK;
 415 }
 416
 417 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 418                                  struct sk_buff *skb)
 419 {
 420         struct dsa_switch *ds = p->dp->ds;
 421         struct sk_buff *clone;
 422         unsigned int type;
 423
 424         type = ptp_classify_raw(skb);
 425         if (type == PTP_CLASS_NONE)
 426                 return;
 427
 428         if (!ds->ops->port_txtstamp)
 429                 return;
 430
 431         clone = skb_clone_sk(skb);
 432         if (!clone)
 433                 return;
 434
 435         DSA_SKB_CB(skb)->clone = clone;
 436
 437         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type))
 438                 return;
 439
 440         kfree_skb(clone);
 441 }
 442
 443 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 444 {
 445         /* SKB for netpoll still need to be mangled with the protocol-specific
 446          * tag to be successfully transmitted
 447          */
 448         if (unlikely(netpoll_tx_running(dev)))
 449                 return dsa_slave_netpoll_send_skb(dev, skb);
 450
 451         /* Queue the SKB for transmission on the parent interface, but
 452          * do not modify its EtherType
 453          */
 454         skb->dev = dsa_slave_to_master(dev);
 455         dev_queue_xmit(skb);
 456
 457         return NETDEV_TX_OK;
 458 }
 459 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 460
 461 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 462 {
 463         struct dsa_slave_priv *p = netdev_priv(dev);
 464         struct pcpu_sw_netstats *s;
 465         struct sk_buff *nskb;
 466
 467         s = this_cpu_ptr(p->stats64);
 468         u64_stats_update_begin(&s->syncp);
 469         s->tx_packets++;
 470         s->tx_bytes += skb->len;
 471         u64_stats_update_end(&s->syncp);
 472
 473         DSA_SKB_CB(skb)->deferred_xmit = false;
 474         DSA_SKB_CB(skb)->clone = NULL;
 475
 476         /* Identify PTP protocol packets, clone them, and pass them to the
 477          * switch driver
 478          */
 479         dsa_skb_tx_timestamp(p, skb);
 480
 481         /* Transmit function may have to reallocate the original SKB,
 482          * in which case it must have freed it. Only free it here on error.
 483          */
 484         nskb = p->xmit(skb, dev);
 485         if (!nskb) {
 486                 if (!DSA_SKB_CB(skb)->deferred_xmit)
 487                         kfree_skb(skb);
 488                 return NETDEV_TX_OK;
 489         }
 490
 491         return dsa_enqueue_skb(nskb, dev);
 492 }
 493
 494 void *dsa_defer_xmit(struct sk_buff *skb, struct net_device *dev)
 495 {
 496         struct dsa_port *dp = dsa_slave_to_port(dev);
 497
 498         DSA_SKB_CB(skb)->deferred_xmit = true;
 499
 500         skb_queue_tail(&dp->xmit_queue, skb);
 501         schedule_work(&dp->xmit_work);
 502         return NULL;
 503 }
 504 EXPORT_SYMBOL_GPL(dsa_defer_xmit);
 505
 506 static void dsa_port_xmit_work(struct work_struct *work)
 507 {
 508         struct dsa_port *dp = container_of(work, struct dsa_port, xmit_work);
 509         struct dsa_switch *ds = dp->ds;
 510         struct sk_buff *skb;
 511
 512         if (unlikely(!ds->ops->port_deferred_xmit))
 513                 return;
 514
 515         while ((skb = skb_dequeue(&dp->xmit_queue)) != NULL)
 516                 ds->ops->port_deferred_xmit(ds, dp->index, skb);
 517 }
 518
 519 /* ethtool operations *******************************************************/
 520
 521 static void dsa_slave_get_drvinfo(struct net_device *dev,
 522                                   struct ethtool_drvinfo *drvinfo)
 523 {
 524         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 525         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 526         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 527 }
 528
 529 static int dsa_slave_get_regs_len(struct net_device *dev)
 530 {
 531         struct dsa_port *dp = dsa_slave_to_port(dev);
 532         struct dsa_switch *ds = dp->ds;
 533
 534         if (ds->ops->get_regs_len)
 535                 return ds->ops->get_regs_len(ds, dp->index);
 536
 537         return -EOPNOTSUPP;
 538 }
 539
 540 static void
 541 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 542 {
 543         struct dsa_port *dp = dsa_slave_to_port(dev);
 544         struct dsa_switch *ds = dp->ds;
 545
 546         if (ds->ops->get_regs)
 547                 ds->ops->get_regs(ds, dp->index, regs, _p);
 548 }
 549
 550 static int dsa_slave_nway_reset(struct net_device *dev)
 551 {
 552         struct dsa_port *dp = dsa_slave_to_port(dev);
 553
 554         return phylink_ethtool_nway_reset(dp->pl);
 555 }
 556
 557 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 558 {
 559         struct dsa_port *dp = dsa_slave_to_port(dev);
 560         struct dsa_switch *ds = dp->ds;
 561
 562         if (ds->cd && ds->cd->eeprom_len)
 563                 return ds->cd->eeprom_len;
 564
 565         if (ds->ops->get_eeprom_len)
 566                 return ds->ops->get_eeprom_len(ds);
 567
 568         return 0;
 569 }
 570
 571 static int dsa_slave_get_eeprom(struct net_device *dev,
 572                                 struct ethtool_eeprom *eeprom, u8 *data)
 573 {
 574         struct dsa_port *dp = dsa_slave_to_port(dev);
 575         struct dsa_switch *ds = dp->ds;
 576
 577         if (ds->ops->get_eeprom)
 578                 return ds->ops->get_eeprom(ds, eeprom, data);
 579
 580         return -EOPNOTSUPP;
 581 }
 582
 583 static int dsa_slave_set_eeprom(struct net_device *dev,
 584                                 struct ethtool_eeprom *eeprom, u8 *data)
 585 {
 586         struct dsa_port *dp = dsa_slave_to_port(dev);
 587         struct dsa_switch *ds = dp->ds;
 588
 589         if (ds->ops->set_eeprom)
 590                 return ds->ops->set_eeprom(ds, eeprom, data);
 591
 592         return -EOPNOTSUPP;
 593 }
 594
 595 static void dsa_slave_get_strings(struct net_device *dev,
 596                                   uint32_t stringset, uint8_t *data)
 597 {
 598         struct dsa_port *dp = dsa_slave_to_port(dev);
 599         struct dsa_switch *ds = dp->ds;
 600
 601         if (stringset == ETH_SS_STATS) {
 602                 int len = ETH_GSTRING_LEN;
 603
 604                 strncpy(data, "tx_packets", len);
 605                 strncpy(data + len, "tx_bytes", len);
 606                 strncpy(data + 2 * len, "rx_packets", len);
 607                 strncpy(data + 3 * len, "rx_bytes", len);
 608                 if (ds->ops->get_strings)
 609                         ds->ops->get_strings(ds, dp->index, stringset,
 610                                              data + 4 * len);
 611         }
 612 }
 613
 614 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 615                                         struct ethtool_stats *stats,
 616                                         uint64_t *data)
 617 {
 618         struct dsa_port *dp = dsa_slave_to_port(dev);
 619         struct dsa_slave_priv *p = netdev_priv(dev);
 620         struct dsa_switch *ds = dp->ds;
 621         struct pcpu_sw_netstats *s;
 622         unsigned int start;
 623         int i;
 624
 625         for_each_possible_cpu(i) {
 626                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 627
 628                 s = per_cpu_ptr(p->stats64, i);
 629                 do {
 630                         start = u64_stats_fetch_begin_irq(&s->syncp);
 631                         tx_packets = s->tx_packets;
 632                         tx_bytes = s->tx_bytes;
 633                         rx_packets = s->rx_packets;
 634                         rx_bytes = s->rx_bytes;
 635                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 636                 data[0] += tx_packets;
 637                 data[1] += tx_bytes;
 638                 data[2] += rx_packets;
 639                 data[3] += rx_bytes;
 640         }
 641         if (ds->ops->get_ethtool_stats)
 642                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 643 }
 644
 645 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 646 {
 647         struct dsa_port *dp = dsa_slave_to_port(dev);
 648         struct dsa_switch *ds = dp->ds;
 649
 650         if (sset == ETH_SS_STATS) {
 651                 int count;
 652
 653                 count = 4;
 654                 if (ds->ops->get_sset_count)
 655                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 656
 657                 return count;
 658         }
 659
 660         return -EOPNOTSUPP;
 661 }
 662
 663 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 664 {
 665         struct dsa_port *dp = dsa_slave_to_port(dev);
 666         struct dsa_switch *ds = dp->ds;
 667
 668         phylink_ethtool_get_wol(dp->pl, w);
 669
 670         if (ds->ops->get_wol)
 671                 ds->ops->get_wol(ds, dp->index, w);
 672 }
 673
 674 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 675 {
 676         struct dsa_port *dp = dsa_slave_to_port(dev);
 677         struct dsa_switch *ds = dp->ds;
 678         int ret = -EOPNOTSUPP;
 679
 680         phylink_ethtool_set_wol(dp->pl, w);
 681
 682         if (ds->ops->set_wol)
 683                 ret = ds->ops->set_wol(ds, dp->index, w);
 684
 685         return ret;
 686 }
 687
 688 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 689 {
 690         struct dsa_port *dp = dsa_slave_to_port(dev);
 691         struct dsa_switch *ds = dp->ds;
 692         int ret;
 693
 694         /* Port's PHY and MAC both need to be EEE capable */
 695         if (!dev->phydev || !dp->pl)
 696                 return -ENODEV;
 697
 698         if (!ds->ops->set_mac_eee)
 699                 return -EOPNOTSUPP;
 700
 701         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 702         if (ret)
 703                 return ret;
 704
 705         return phylink_ethtool_set_eee(dp->pl, e);
 706 }
 707
 708 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 709 {
 710         struct dsa_port *dp = dsa_slave_to_port(dev);
 711         struct dsa_switch *ds = dp->ds;
 712         int ret;
 713
 714         /* Port's PHY and MAC both need to be EEE capable */
 715         if (!dev->phydev || !dp->pl)
 716                 return -ENODEV;
 717
 718         if (!ds->ops->get_mac_eee)
 719                 return -EOPNOTSUPP;
 720
 721         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 722         if (ret)
 723                 return ret;
 724
 725         return phylink_ethtool_get_eee(dp->pl, e);
 726 }
 727
 728 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 729                                         struct ethtool_link_ksettings *cmd)
 730 {
 731         struct dsa_port *dp = dsa_slave_to_port(dev);
 732
 733         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 734 }
 735
 736 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 737                                         const struct ethtool_link_ksettings *cmd)
 738 {
 739         struct dsa_port *dp = dsa_slave_to_port(dev);
 740
 741         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 742 }
 743
 744 #ifdef CONFIG_NET_POLL_CONTROLLER
 745 static int dsa_slave_netpoll_setup(struct net_device *dev,
 746                                    struct netpoll_info *ni)
 747 {
 748         struct net_device *master = dsa_slave_to_master(dev);
 749         struct dsa_slave_priv *p = netdev_priv(dev);
 750         struct netpoll *netpoll;
 751         int err = 0;
 752
 753         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 754         if (!netpoll)
 755                 return -ENOMEM;
 756
 757         err = __netpoll_setup(netpoll, master);
 758         if (err) {
 759                 kfree(netpoll);
 760                 goto out;
 761         }
 762
 763         p->netpoll = netpoll;
 764 out:
 765         return err;
 766 }
 767
 768 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 769 {
 770         struct dsa_slave_priv *p = netdev_priv(dev);
 771         struct netpoll *netpoll = p->netpoll;
 772
 773         if (!netpoll)
 774                 return;
 775
 776         p->netpoll = NULL;
 777
 778         __netpoll_free(netpoll);
 779 }
 780
 781 static void dsa_slave_poll_controller(struct net_device *dev)
 782 {
 783 }
 784 #endif
 785
 786 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 787                                         char *name, size_t len)
 788 {
 789         struct dsa_port *dp = dsa_slave_to_port(dev);
 790
 791         /* For non-legacy ports, devlink is used and it takes
 792          * care of the name generation. This ndo implementation
 793          * should be removed with legacy support.
 794          */
 795         if (dp->ds->devlink)
 796                 return -EOPNOTSUPP;
 797
 798         if (snprintf(name, len, "p%d", dp->index) >= len)
 799                 return -EINVAL;
 800
 801         return 0;
 802 }
 803
 804 static struct dsa_mall_tc_entry *
 805 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 806 {
 807         struct dsa_slave_priv *p = netdev_priv(dev);
 808         struct dsa_mall_tc_entry *mall_tc_entry;
 809
 810         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 811                 if (mall_tc_entry->cookie == cookie)
 812                         return mall_tc_entry;
 813
 814         return NULL;
 815 }
 816
 817 static int dsa_slave_add_cls_matchall(struct net_device *dev,
 818                                       struct tc_cls_matchall_offload *cls,
 819                                       bool ingress)
 820 {
 821         struct dsa_port *dp = dsa_slave_to_port(dev);
 822         struct dsa_slave_priv *p = netdev_priv(dev);
 823         struct dsa_mall_tc_entry *mall_tc_entry;
 824         __be16 protocol = cls->common.protocol;
 825         struct dsa_switch *ds = dp->ds;
 826         struct flow_action_entry *act;
 827         struct dsa_port *to_dp;
 828         int err = -EOPNOTSUPP;
 829
 830         if (!ds->ops->port_mirror_add)
 831                 return err;
 832
 833         if (!flow_offload_has_one_action(&cls->rule->action))
 834                 return err;
 835
 836         act = &cls->rule->action.entries[0];
 837
 838         if (act->id == FLOW_ACTION_MIRRED && protocol == htons(ETH_P_ALL)) {
 839                 struct dsa_mall_mirror_tc_entry *mirror;
 840
 841                 if (!act->dev)
 842                         return -EINVAL;
 843
 844                 if (!dsa_slave_dev_check(act->dev))
 845                         return -EOPNOTSUPP;
 846
 847                 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 848                 if (!mall_tc_entry)
 849                         return -ENOMEM;
 850
 851                 mall_tc_entry->cookie = cls->cookie;
 852                 mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 853                 mirror = &mall_tc_entry->mirror;
 854
 855                 to_dp = dsa_slave_to_port(act->dev);
 856
 857                 mirror->to_local_port = to_dp->index;
 858                 mirror->ingress = ingress;
 859
 860                 err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 861                 if (err) {
 862                         kfree(mall_tc_entry);
 863                         return err;
 864                 }
 865
 866                 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 867         }
 868
 869         return 0;
 870 }
 871
 872 static void dsa_slave_del_cls_matchall(struct net_device *dev,
 873                                        struct tc_cls_matchall_offload *cls)
 874 {
 875         struct dsa_port *dp = dsa_slave_to_port(dev);
 876         struct dsa_mall_tc_entry *mall_tc_entry;
 877         struct dsa_switch *ds = dp->ds;
 878
 879         if (!ds->ops->port_mirror_del)
 880                 return;
 881
 882         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
 883         if (!mall_tc_entry)
 884                 return;
 885
 886         list_del(&mall_tc_entry->list);
 887
 888         switch (mall_tc_entry->type) {
 889         case DSA_PORT_MALL_MIRROR:
 890                 ds->ops->port_mirror_del(ds, dp->index, &mall_tc_entry->mirror);
 891                 break;
 892         default:
 893                 WARN_ON(1);
 894         }
 895
 896         kfree(mall_tc_entry);
 897 }
 898
 899 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
 900                                            struct tc_cls_matchall_offload *cls,
 901                                            bool ingress)
 902 {
 903         if (cls->common.chain_index)
 904                 return -EOPNOTSUPP;
 905
 906         switch (cls->command) {
 907         case TC_CLSMATCHALL_REPLACE:
 908                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
 909         case TC_CLSMATCHALL_DESTROY:
 910                 dsa_slave_del_cls_matchall(dev, cls);
 911                 return 0;
 912         default:
 913                 return -EOPNOTSUPP;
 914         }
 915 }
 916
 917 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
 918                                        void *cb_priv, bool ingress)
 919 {
 920         struct net_device *dev = cb_priv;
 921
 922         if (!tc_can_offload(dev))
 923                 return -EOPNOTSUPP;
 924
 925         switch (type) {
 926         case TC_SETUP_CLSMATCHALL:
 927                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
 928         default:
 929                 return -EOPNOTSUPP;
 930         }
 931 }
 932
 933 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
 934                                           void *type_data, void *cb_priv)
 935 {
 936         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
 937 }
 938
 939 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
 940                                           void *type_data, void *cb_priv)
 941 {
 942         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
 943 }
 944
 945 static int dsa_slave_setup_tc_block(struct net_device *dev,
 946                                     struct tc_block_offload *f)
 947 {
 948         tc_setup_cb_t *cb;
 949
 950         if (f->binder_type == TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 951                 cb = dsa_slave_setup_tc_block_cb_ig;
 952         else if (f->binder_type == TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
 953                 cb = dsa_slave_setup_tc_block_cb_eg;
 954         else
 955                 return -EOPNOTSUPP;
 956
 957         switch (f->command) {
 958         case TC_BLOCK_BIND:
 959                 return tcf_block_cb_register(f->block, cb, dev, dev, f->extack);
 960         case TC_BLOCK_UNBIND:
 961                 tcf_block_cb_unregister(f->block, cb, dev);
 962                 return 0;
 963         default:
 964                 return -EOPNOTSUPP;
 965         }
 966 }
 967
 968 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
 969                               void *type_data)
 970 {
 971         switch (type) {
 972         case TC_SETUP_BLOCK:
 973                 return dsa_slave_setup_tc_block(dev, type_data);
 974         default:
 975                 return -EOPNOTSUPP;
 976         }
 977 }
 978
 979 static void dsa_slave_get_stats64(struct net_device *dev,
 980                                   struct rtnl_link_stats64 *stats)
 981 {
 982         struct dsa_slave_priv *p = netdev_priv(dev);
 983         struct pcpu_sw_netstats *s;
 984         unsigned int start;
 985         int i;
 986
 987         netdev_stats_to_stats64(stats, &dev->stats);
 988         for_each_possible_cpu(i) {
 989                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 990
 991                 s = per_cpu_ptr(p->stats64, i);
 992                 do {
 993                         start = u64_stats_fetch_begin_irq(&s->syncp);
 994                         tx_packets = s->tx_packets;
 995                         tx_bytes = s->tx_bytes;
 996                         rx_packets = s->rx_packets;
 997                         rx_bytes = s->rx_bytes;
 998                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 999
1000                 stats->tx_packets += tx_packets;
1001                 stats->tx_bytes += tx_bytes;
1002                 stats->rx_packets += rx_packets;
1003                 stats->rx_bytes += rx_bytes;
1004         }
1005 }
1006
1007 static int dsa_slave_get_rxnfc(struct net_device *dev,
1008                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1009 {
1010         struct dsa_port *dp = dsa_slave_to_port(dev);
1011         struct dsa_switch *ds = dp->ds;
1012
1013         if (!ds->ops->get_rxnfc)
1014                 return -EOPNOTSUPP;
1015
1016         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1017 }
1018
1019 static int dsa_slave_set_rxnfc(struct net_device *dev,
1020                                struct ethtool_rxnfc *nfc)
1021 {
1022         struct dsa_port *dp = dsa_slave_to_port(dev);
1023         struct dsa_switch *ds = dp->ds;
1024
1025         if (!ds->ops->set_rxnfc)
1026                 return -EOPNOTSUPP;
1027
1028         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1029 }
1030
1031 static int dsa_slave_get_ts_info(struct net_device *dev,
1032                                  struct ethtool_ts_info *ts)
1033 {
1034         struct dsa_slave_priv *p = netdev_priv(dev);
1035         struct dsa_switch *ds = p->dp->ds;
1036
1037         if (!ds->ops->get_ts_info)
1038                 return -EOPNOTSUPP;
1039
1040         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1041 }
1042
1043 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1044                                      u16 vid)
1045 {
1046         struct dsa_port *dp = dsa_slave_to_port(dev);
1047         struct bridge_vlan_info info;
1048         int ret;
1049
1050         /* Check for a possible bridge VLAN entry now since there is no
1051          * need to emulate the switchdev prepare + commit phase.
1052          */
1053         if (dp->bridge_dev) {
1054                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1055                  * device, respectively the VID is not found, returning
1056                  * 0 means success, which is a failure for us here.
1057                  */
1058                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1059                 if (ret == 0)
1060                         return -EBUSY;
1061         }
1062
1063         /* This API only allows programming tagged, non-PVID VIDs */
1064         return dsa_port_vid_add(dp, vid, 0);
1065 }
1066
1067 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1068                                       u16 vid)
1069 {
1070         struct dsa_port *dp = dsa_slave_to_port(dev);
1071         struct bridge_vlan_info info;
1072         int ret;
1073
1074         /* Check for a possible bridge VLAN entry now since there is no
1075          * need to emulate the switchdev prepare + commit phase.
1076          */
1077         if (dp->bridge_dev) {
1078                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1079                  * device, respectively the VID is not found, returning
1080                  * 0 means success, which is a failure for us here.
1081                  */
1082                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1083                 if (ret == 0)
1084                         return -EBUSY;
1085         }
1086
1087         ret = dsa_port_vid_del(dp, vid);
1088         if (ret == -EOPNOTSUPP)
1089                 ret = 0;
1090
1091         return ret;
1092 }
1093
1094 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1095         .get_drvinfo            = dsa_slave_get_drvinfo,
1096         .get_regs_len           = dsa_slave_get_regs_len,
1097         .get_regs               = dsa_slave_get_regs,
1098         .nway_reset             = dsa_slave_nway_reset,
1099         .get_link               = ethtool_op_get_link,
1100         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1101         .get_eeprom             = dsa_slave_get_eeprom,
1102         .set_eeprom             = dsa_slave_set_eeprom,
1103         .get_strings            = dsa_slave_get_strings,
1104         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1105         .get_sset_count         = dsa_slave_get_sset_count,
1106         .set_wol                = dsa_slave_set_wol,
1107         .get_wol                = dsa_slave_get_wol,
1108         .set_eee                = dsa_slave_set_eee,
1109         .get_eee                = dsa_slave_get_eee,
1110         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1111         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1112         .get_rxnfc              = dsa_slave_get_rxnfc,
1113         .set_rxnfc              = dsa_slave_set_rxnfc,
1114         .get_ts_info            = dsa_slave_get_ts_info,
1115 };
1116
1117 /* legacy way, bypassing the bridge *****************************************/
1118 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1119                        struct net_device *dev,
1120                        const unsigned char *addr, u16 vid,
1121                        u16 flags,
1122                        struct netlink_ext_ack *extack)
1123 {
1124         struct dsa_port *dp = dsa_slave_to_port(dev);
1125
1126         return dsa_port_fdb_add(dp, addr, vid);
1127 }
1128
1129 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1130                        struct net_device *dev,
1131                        const unsigned char *addr, u16 vid)
1132 {
1133         struct dsa_port *dp = dsa_slave_to_port(dev);
1134
1135         return dsa_port_fdb_del(dp, addr, vid);
1136 }
1137
1138 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1139 {
1140         struct dsa_port *dp = dsa_slave_to_port(dev);
1141
1142         return dp->ds->devlink ? &dp->devlink_port : NULL;
1143 }
1144
1145 static const struct net_device_ops dsa_slave_netdev_ops = {
1146         .ndo_open               = dsa_slave_open,
1147         .ndo_stop               = dsa_slave_close,
1148         .ndo_start_xmit         = dsa_slave_xmit,
1149         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1150         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1151         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1152         .ndo_fdb_add            = dsa_legacy_fdb_add,
1153         .ndo_fdb_del            = dsa_legacy_fdb_del,
1154         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1155         .ndo_do_ioctl           = dsa_slave_ioctl,
1156         .ndo_get_iflink         = dsa_slave_get_iflink,
1157 #ifdef CONFIG_NET_POLL_CONTROLLER
1158         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1159         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1160         .ndo_poll_controller    = dsa_slave_poll_controller,
1161 #endif
1162         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1163         .ndo_setup_tc           = dsa_slave_setup_tc,
1164         .ndo_get_stats64        = dsa_slave_get_stats64,
1165         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1166         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1167         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1168         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1169 };
1170
1171 static struct device_type dsa_type = {
1172         .name   = "dsa",
1173 };
1174
1175 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1176 {
1177         const struct dsa_port *dp = dsa_to_port(ds, port);
1178
1179         phylink_mac_change(dp->pl, up);
1180 }
1181 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1182
1183 static void dsa_slave_phylink_fixed_state(struct net_device *dev,
1184                                           struct phylink_link_state *state)
1185 {
1186         struct dsa_port *dp = dsa_slave_to_port(dev);
1187         struct dsa_switch *ds = dp->ds;
1188
1189         /* No need to check that this operation is valid, the callback would
1190          * not be called if it was not.
1191          */
1192         ds->ops->phylink_fixed_state(ds, dp->index, state);
1193 }
1194
1195 /* slave device setup *******************************************************/
1196 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1197 {
1198         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1199         struct dsa_switch *ds = dp->ds;
1200
1201         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1202         if (!slave_dev->phydev) {
1203                 netdev_err(slave_dev, "no phy at %d\n", addr);
1204                 return -ENODEV;
1205         }
1206
1207         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1208 }
1209
1210 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1211 {
1212         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1213         struct device_node *port_dn = dp->dn;
1214         struct dsa_switch *ds = dp->ds;
1215         u32 phy_flags = 0;
1216         int mode, ret;
1217
1218         mode = of_get_phy_mode(port_dn);
1219         if (mode < 0)
1220                 mode = PHY_INTERFACE_MODE_NA;
1221
1222         dp->pl_config.dev = &slave_dev->dev;
1223         dp->pl_config.type = PHYLINK_NETDEV;
1224
1225         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1226                                 &dsa_port_phylink_mac_ops);
1227         if (IS_ERR(dp->pl)) {
1228                 netdev_err(slave_dev,
1229                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1230                 return PTR_ERR(dp->pl);
1231         }
1232
1233         /* Register only if the switch provides such a callback, since this
1234          * callback takes precedence over polling the link GPIO in PHYLINK
1235          * (see phylink_get_fixed_state).
1236          */
1237         if (ds->ops->phylink_fixed_state)
1238                 phylink_fixed_state_cb(dp->pl, dsa_slave_phylink_fixed_state);
1239
1240         if (ds->ops->get_phy_flags)
1241                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1242
1243         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1244         if (ret == -ENODEV && ds->slave_mii_bus) {
1245                 /* We could not connect to a designated PHY or SFP, so try to
1246                  * use the switch internal MDIO bus instead
1247                  */
1248                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1249                 if (ret) {
1250                         netdev_err(slave_dev,
1251                                    "failed to connect to port %d: %d\n",
1252                                    dp->index, ret);
1253                         phylink_destroy(dp->pl);
1254                         return ret;
1255                 }
1256         }
1257
1258         return ret;
1259 }
1260
1261 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1262 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1263                                             struct netdev_queue *txq,
1264                                             void *_unused)
1265 {
1266         lockdep_set_class(&txq->_xmit_lock,
1267                           &dsa_slave_netdev_xmit_lock_key);
1268 }
1269
1270 int dsa_slave_suspend(struct net_device *slave_dev)
1271 {
1272         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1273
1274         if (!netif_running(slave_dev))
1275                 return 0;
1276
1277         cancel_work_sync(&dp->xmit_work);
1278         skb_queue_purge(&dp->xmit_queue);
1279
1280         netif_device_detach(slave_dev);
1281
1282         rtnl_lock();
1283         phylink_stop(dp->pl);
1284         rtnl_unlock();
1285
1286         return 0;
1287 }
1288
1289 int dsa_slave_resume(struct net_device *slave_dev)
1290 {
1291         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1292
1293         if (!netif_running(slave_dev))
1294                 return 0;
1295
1296         netif_device_attach(slave_dev);
1297
1298         rtnl_lock();
1299         phylink_start(dp->pl);
1300         rtnl_unlock();
1301
1302         return 0;
1303 }
1304
1305 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1306 {
1307         struct net_device *master = dsa_slave_to_master(dev);
1308         struct dsa_port *dp = dsa_slave_to_port(dev);
1309         struct dsa_notifier_register_info rinfo = {
1310                 .switch_number = dp->ds->index,
1311                 .port_number = dp->index,
1312                 .master = master,
1313                 .info.dev = dev,
1314         };
1315
1316         call_dsa_notifiers(val, dev, &rinfo.info);
1317 }
1318
1319 int dsa_slave_create(struct dsa_port *port)
1320 {
1321         const struct dsa_port *cpu_dp = port->cpu_dp;
1322         struct net_device *master = cpu_dp->master;
1323         struct dsa_switch *ds = port->ds;
1324         const char *name = port->name;
1325         struct net_device *slave_dev;
1326         struct dsa_slave_priv *p;
1327         int ret;
1328
1329         if (!ds->num_tx_queues)
1330                 ds->num_tx_queues = 1;
1331
1332         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1333                                      NET_NAME_UNKNOWN, ether_setup,
1334                                      ds->num_tx_queues, 1);
1335         if (slave_dev == NULL)
1336                 return -ENOMEM;
1337
1338         slave_dev->features = master->vlan_features | NETIF_F_HW_TC |
1339                                 NETIF_F_HW_VLAN_CTAG_FILTER;
1340         slave_dev->hw_features |= NETIF_F_HW_TC;
1341         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1342         if (!IS_ERR_OR_NULL(port->mac))
1343                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1344         else
1345                 eth_hw_addr_inherit(slave_dev, master);
1346         slave_dev->priv_flags |= IFF_NO_QUEUE;
1347         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1348         slave_dev->min_mtu = 0;
1349         slave_dev->max_mtu = ETH_MAX_MTU;
1350         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1351
1352         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1353                                  NULL);
1354
1355         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1356         slave_dev->dev.of_node = port->dn;
1357         slave_dev->vlan_features = master->vlan_features;
1358
1359         p = netdev_priv(slave_dev);
1360         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1361         if (!p->stats64) {
1362                 free_netdev(slave_dev);
1363                 return -ENOMEM;
1364         }
1365         p->dp = port;
1366         INIT_LIST_HEAD(&p->mall_tc_list);
1367         INIT_WORK(&port->xmit_work, dsa_port_xmit_work);
1368         skb_queue_head_init(&port->xmit_queue);
1369         p->xmit = cpu_dp->tag_ops->xmit;
1370         port->slave = slave_dev;
1371
1372         netif_carrier_off(slave_dev);
1373
1374         ret = dsa_slave_phy_setup(slave_dev);
1375         if (ret) {
1376                 netdev_err(master, "error %d setting up slave phy\n", ret);
1377                 goto out_free;
1378         }
1379
1380         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1381
1382         ret = register_netdev(slave_dev);
1383         if (ret) {
1384                 netdev_err(master, "error %d registering interface %s\n",
1385                            ret, slave_dev->name);
1386                 goto out_phy;
1387         }
1388
1389         return 0;
1390
1391 out_phy:
1392         rtnl_lock();
1393         phylink_disconnect_phy(p->dp->pl);
1394         rtnl_unlock();
1395         phylink_destroy(p->dp->pl);
1396 out_free:
1397         free_percpu(p->stats64);
1398         free_netdev(slave_dev);
1399         port->slave = NULL;
1400         return ret;
1401 }
1402
1403 void dsa_slave_destroy(struct net_device *slave_dev)
1404 {
1405         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1406         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1407
1408         netif_carrier_off(slave_dev);
1409         rtnl_lock();
1410         phylink_disconnect_phy(dp->pl);
1411         rtnl_unlock();
1412
1413         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1414         unregister_netdev(slave_dev);
1415         phylink_destroy(dp->pl);
1416         free_percpu(p->stats64);
1417         free_netdev(slave_dev);
1418 }
1419
1420 static bool dsa_slave_dev_check(const struct net_device *dev)
1421 {
1422         return dev->netdev_ops == &dsa_slave_netdev_ops;
1423 }
1424
1425 static int dsa_slave_changeupper(struct net_device *dev,
1426                                  struct netdev_notifier_changeupper_info *info)
1427 {
1428         struct dsa_port *dp = dsa_slave_to_port(dev);
1429         int err = NOTIFY_DONE;
1430
1431         if (netif_is_bridge_master(info->upper_dev)) {
1432                 if (info->linking) {
1433                         err = dsa_port_bridge_join(dp, info->upper_dev);
1434                         err = notifier_from_errno(err);
1435                 } else {
1436                         dsa_port_bridge_leave(dp, info->upper_dev);
1437                         err = NOTIFY_OK;
1438                 }
1439         }
1440
1441         return err;
1442 }
1443
1444 static int dsa_slave_upper_vlan_check(struct net_device *dev,
1445                                       struct netdev_notifier_changeupper_info *
1446                                       info)
1447 {
1448         struct netlink_ext_ack *ext_ack;
1449         struct net_device *slave;
1450         struct dsa_port *dp;
1451
1452         ext_ack = netdev_notifier_info_to_extack(&info->info);
1453
1454         if (!is_vlan_dev(dev))
1455                 return NOTIFY_DONE;
1456
1457         slave = vlan_dev_real_dev(dev);
1458         if (!dsa_slave_dev_check(slave))
1459                 return NOTIFY_DONE;
1460
1461         dp = dsa_slave_to_port(slave);
1462         if (!dp->bridge_dev)
1463                 return NOTIFY_DONE;
1464
1465         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1466         if (br_vlan_enabled(dp->bridge_dev) &&
1467             netif_is_bridge_master(info->upper_dev) && info->linking) {
1468                 NL_SET_ERR_MSG_MOD(ext_ack,
1469                                    "Cannot enslave VLAN device into VLAN aware bridge");
1470                 return notifier_from_errno(-EINVAL);
1471         }
1472
1473         return NOTIFY_DONE;
1474 }
1475
1476 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1477                                      unsigned long event, void *ptr)
1478 {
1479         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1480
1481         if (event == NETDEV_CHANGEUPPER) {
1482                 if (!dsa_slave_dev_check(dev))
1483                         return dsa_slave_upper_vlan_check(dev, ptr);
1484
1485                 return dsa_slave_changeupper(dev, ptr);
1486         }
1487
1488         return NOTIFY_DONE;
1489 }
1490
1491 struct dsa_switchdev_event_work {
1492         struct work_struct work;
1493         struct switchdev_notifier_fdb_info fdb_info;
1494         struct net_device *dev;
1495         unsigned long event;
1496 };
1497
1498 static void dsa_slave_switchdev_event_work(struct work_struct *work)
1499 {
1500         struct dsa_switchdev_event_work *switchdev_work =
1501                 container_of(work, struct dsa_switchdev_event_work, work);
1502         struct net_device *dev = switchdev_work->dev;
1503         struct switchdev_notifier_fdb_info *fdb_info;
1504         struct dsa_port *dp = dsa_slave_to_port(dev);
1505         int err;
1506
1507         rtnl_lock();
1508         switch (switchdev_work->event) {
1509         case SWITCHDEV_FDB_ADD_TO_DEVICE:
1510                 fdb_info = &switchdev_work->fdb_info;
1511                 if (!fdb_info->added_by_user)
1512                         break;
1513
1514                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
1515                 if (err) {
1516                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
1517                         break;
1518                 }
1519                 fdb_info->offloaded = true;
1520                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
1521                                          &fdb_info->info, NULL);
1522                 break;
1523
1524         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1525                 fdb_info = &switchdev_work->fdb_info;
1526                 if (!fdb_info->added_by_user)
1527                         break;
1528
1529                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
1530                 if (err) {
1531                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
1532                         dev_close(dev);
1533                 }
1534                 break;
1535         }
1536         rtnl_unlock();
1537
1538         kfree(switchdev_work->fdb_info.addr);
1539         kfree(switchdev_work);
1540         dev_put(dev);
1541 }
1542
1543 static int
1544 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
1545                                   switchdev_work,
1546                                   const struct switchdev_notifier_fdb_info *
1547                                   fdb_info)
1548 {
1549         memcpy(&switchdev_work->fdb_info, fdb_info,
1550                sizeof(switchdev_work->fdb_info));
1551         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
1552         if (!switchdev_work->fdb_info.addr)
1553                 return -ENOMEM;
1554         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
1555                         fdb_info->addr);
1556         return 0;
1557 }
1558
1559 /* Called under rcu_read_lock() */
1560 static int dsa_slave_switchdev_event(struct notifier_block *unused,
1561                                      unsigned long event, void *ptr)
1562 {
1563         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1564         struct dsa_switchdev_event_work *switchdev_work;
1565         int err;
1566
1567         if (event == SWITCHDEV_PORT_ATTR_SET) {
1568                 err = switchdev_handle_port_attr_set(dev, ptr,
1569                                                      dsa_slave_dev_check,
1570                                                      dsa_slave_port_attr_set);
1571                 return notifier_from_errno(err);
1572         }
1573
1574         if (!dsa_slave_dev_check(dev))
1575                 return NOTIFY_DONE;
1576
1577         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
1578         if (!switchdev_work)
1579                 return NOTIFY_BAD;
1580
1581         INIT_WORK(&switchdev_work->work,
1582                   dsa_slave_switchdev_event_work);
1583         switchdev_work->dev = dev;
1584         switchdev_work->event = event;
1585
1586         switch (event) {
1587         case SWITCHDEV_FDB_ADD_TO_DEVICE: /* fall through */
1588         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1589                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
1590                         goto err_fdb_work_init;
1591                 dev_hold(dev);
1592                 break;
1593         default:
1594                 kfree(switchdev_work);
1595                 return NOTIFY_DONE;
1596         }
1597
1598         dsa_schedule_work(&switchdev_work->work);
1599         return NOTIFY_OK;
1600
1601 err_fdb_work_init:
1602         kfree(switchdev_work);
1603         return NOTIFY_BAD;
1604 }
1605
1606 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
1607                                               unsigned long event, void *ptr)
1608 {
1609         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1610         int err;
1611
1612         switch (event) {
1613         case SWITCHDEV_PORT_OBJ_ADD:
1614                 err = switchdev_handle_port_obj_add(dev, ptr,
1615                                                     dsa_slave_dev_check,
1616                                                     dsa_slave_port_obj_add);
1617                 return notifier_from_errno(err);
1618         case SWITCHDEV_PORT_OBJ_DEL:
1619                 err = switchdev_handle_port_obj_del(dev, ptr,
1620                                                     dsa_slave_dev_check,
1621                                                     dsa_slave_port_obj_del);
1622                 return notifier_from_errno(err);
1623         case SWITCHDEV_PORT_ATTR_SET:
1624                 err = switchdev_handle_port_attr_set(dev, ptr,
1625                                                      dsa_slave_dev_check,
1626                                                      dsa_slave_port_attr_set);
1627                 return notifier_from_errno(err);
1628         }
1629
1630         return NOTIFY_DONE;
1631 }
1632
1633 static struct notifier_block dsa_slave_nb __read_mostly = {
1634         .notifier_call  = dsa_slave_netdevice_event,
1635 };
1636
1637 static struct notifier_block dsa_slave_switchdev_notifier = {
1638         .notifier_call = dsa_slave_switchdev_event,
1639 };
1640
1641 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
1642         .notifier_call = dsa_slave_switchdev_blocking_event,
1643 };
1644
1645 int dsa_slave_register_notifier(void)
1646 {
1647         struct notifier_block *nb;
1648         int err;
1649
1650         err = register_netdevice_notifier(&dsa_slave_nb);
1651         if (err)
1652                 return err;
1653
1654         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
1655         if (err)
1656                 goto err_switchdev_nb;
1657
1658         nb = &dsa_slave_switchdev_blocking_notifier;
1659         err = register_switchdev_blocking_notifier(nb);
1660         if (err)
1661                 goto err_switchdev_blocking_nb;
1662
1663         return 0;
1664
1665 err_switchdev_blocking_nb:
1666         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
1667 err_switchdev_nb:
1668         unregister_netdevice_notifier(&dsa_slave_nb);
1669         return err;
1670 }
1671
1672 void dsa_slave_unregister_notifier(void)
1673 {
1674         struct notifier_block *nb;
1675         int err;
1676
1677         nb = &dsa_slave_switchdev_blocking_notifier;
1678         err = unregister_switchdev_blocking_notifier(nb);
1679         if (err)
1680                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
1681
1682         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
1683         if (err)
1684                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
1685
1686         err = unregister_netdevice_notifier(&dsa_slave_nb);
1687         if (err)
1688                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
1689 }