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 /* slave mii_bus handling ***************************************************/
  26 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  27 {
  28         struct dsa_switch *ds = bus->priv;
  29
  30         if (ds->phys_mii_mask & (1 << addr))
  31                 return ds->ops->phy_read(ds, addr, reg);
  32
  33         return 0xffff;
  34 }
  35
  36 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  37 {
  38         struct dsa_switch *ds = bus->priv;
  39
  40         if (ds->phys_mii_mask & (1 << addr))
  41                 return ds->ops->phy_write(ds, addr, reg, val);
  42
  43         return 0;
  44 }
  45
  46 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  47 {
  48         ds->slave_mii_bus->priv = (void *)ds;
  49         ds->slave_mii_bus->name = "dsa slave smi";
  50         ds->slave_mii_bus->read = dsa_slave_phy_read;
  51         ds->slave_mii_bus->write = dsa_slave_phy_write;
  52         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  53                  ds->dst->index, ds->index);
  54         ds->slave_mii_bus->parent = ds->dev;
  55         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  56 }
  57
  58
  59 /* slave device handling ****************************************************/
  60 static int dsa_slave_get_iflink(const struct net_device *dev)
  61 {
  62         return dsa_slave_to_master(dev)->ifindex;
  63 }
  64
  65 static int dsa_slave_open(struct net_device *dev)
  66 {
  67         struct net_device *master = dsa_slave_to_master(dev);
  68         struct dsa_port *dp = dsa_slave_to_port(dev);
  69         int err;
  70
  71         if (!(master->flags & IFF_UP))
  72                 return -ENETDOWN;
  73
  74         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  75                 err = dev_uc_add(master, dev->dev_addr);
  76                 if (err < 0)
  77                         goto out;
  78         }
  79
  80         if (dev->flags & IFF_ALLMULTI) {
  81                 err = dev_set_allmulti(master, 1);
  82                 if (err < 0)
  83                         goto del_unicast;
  84         }
  85         if (dev->flags & IFF_PROMISC) {
  86                 err = dev_set_promiscuity(master, 1);
  87                 if (err < 0)
  88                         goto clear_allmulti;
  89         }
  90
  91         err = dsa_port_enable_rt(dp, dev->phydev);
  92         if (err)
  93                 goto clear_promisc;
  94
  95         return 0;
  96
  97 clear_promisc:
  98         if (dev->flags & IFF_PROMISC)
  99                 dev_set_promiscuity(master, -1);
 100 clear_allmulti:
 101         if (dev->flags & IFF_ALLMULTI)
 102                 dev_set_allmulti(master, -1);
 103 del_unicast:
 104         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 105                 dev_uc_del(master, dev->dev_addr);
 106 out:
 107         return err;
 108 }
 109
 110 static int dsa_slave_close(struct net_device *dev)
 111 {
 112         struct net_device *master = dsa_slave_to_master(dev);
 113         struct dsa_port *dp = dsa_slave_to_port(dev);
 114
 115         dsa_port_disable_rt(dp);
 116
 117         dev_mc_unsync(master, dev);
 118         dev_uc_unsync(master, dev);
 119         if (dev->flags & IFF_ALLMULTI)
 120                 dev_set_allmulti(master, -1);
 121         if (dev->flags & IFF_PROMISC)
 122                 dev_set_promiscuity(master, -1);
 123
 124         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 125                 dev_uc_del(master, dev->dev_addr);
 126
 127         return 0;
 128 }
 129
 130 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 131 {
 132         struct net_device *master = dsa_slave_to_master(dev);
 133         if (dev->flags & IFF_UP) {
 134                 if (change & IFF_ALLMULTI)
 135                         dev_set_allmulti(master,
 136                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 137                 if (change & IFF_PROMISC)
 138                         dev_set_promiscuity(master,
 139                                             dev->flags & IFF_PROMISC ? 1 : -1);
 140         }
 141 }
 142
 143 static void dsa_slave_set_rx_mode(struct net_device *dev)
 144 {
 145         struct net_device *master = dsa_slave_to_master(dev);
 146
 147         dev_mc_sync(master, dev);
 148         dev_uc_sync(master, dev);
 149 }
 150
 151 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 152 {
 153         struct net_device *master = dsa_slave_to_master(dev);
 154         struct sockaddr *addr = a;
 155         int err;
 156
 157         if (!is_valid_ether_addr(addr->sa_data))
 158                 return -EADDRNOTAVAIL;
 159
 160         if (!(dev->flags & IFF_UP))
 161                 goto out;
 162
 163         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 164                 err = dev_uc_add(master, addr->sa_data);
 165                 if (err < 0)
 166                         return err;
 167         }
 168
 169         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 170                 dev_uc_del(master, dev->dev_addr);
 171
 172 out:
 173         ether_addr_copy(dev->dev_addr, addr->sa_data);
 174
 175         return 0;
 176 }
 177
 178 struct dsa_slave_dump_ctx {
 179         struct net_device *dev;
 180         struct sk_buff *skb;
 181         struct netlink_callback *cb;
 182         int idx;
 183 };
 184
 185 static int
 186 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 187                            bool is_static, void *data)
 188 {
 189         struct dsa_slave_dump_ctx *dump = data;
 190         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 191         u32 seq = dump->cb->nlh->nlmsg_seq;
 192         struct nlmsghdr *nlh;
 193         struct ndmsg *ndm;
 194
 195         if (dump->idx < dump->cb->args[2])
 196                 goto skip;
 197
 198         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 199                         sizeof(*ndm), NLM_F_MULTI);
 200         if (!nlh)
 201                 return -EMSGSIZE;
 202
 203         ndm = nlmsg_data(nlh);
 204         ndm->ndm_family  = AF_BRIDGE;
 205         ndm->ndm_pad1    = 0;
 206         ndm->ndm_pad2    = 0;
 207         ndm->ndm_flags   = NTF_SELF;
 208         ndm->ndm_type    = 0;
 209         ndm->ndm_ifindex = dump->dev->ifindex;
 210         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 211
 212         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 213                 goto nla_put_failure;
 214
 215         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 216                 goto nla_put_failure;
 217
 218         nlmsg_end(dump->skb, nlh);
 219
 220 skip:
 221         dump->idx++;
 222         return 0;
 223
 224 nla_put_failure:
 225         nlmsg_cancel(dump->skb, nlh);
 226         return -EMSGSIZE;
 227 }
 228
 229 static int
 230 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 231                    struct net_device *dev, struct net_device *filter_dev,
 232                    int *idx)
 233 {
 234         struct dsa_port *dp = dsa_slave_to_port(dev);
 235         struct dsa_slave_dump_ctx dump = {
 236                 .dev = dev,
 237                 .skb = skb,
 238                 .cb = cb,
 239                 .idx = *idx,
 240         };
 241         int err;
 242
 243         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 244         *idx = dump.idx;
 245
 246         return err;
 247 }
 248
 249 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 250 {
 251         struct dsa_slave_priv *p = netdev_priv(dev);
 252         struct dsa_switch *ds = p->dp->ds;
 253         int port = p->dp->index;
 254
 255         /* Pass through to switch driver if it supports timestamping */
 256         switch (cmd) {
 257         case SIOCGHWTSTAMP:
 258                 if (ds->ops->port_hwtstamp_get)
 259                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 260                 break;
 261         case SIOCSHWTSTAMP:
 262                 if (ds->ops->port_hwtstamp_set)
 263                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 264                 break;
 265         }
 266
 267         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 268 }
 269
 270 static int dsa_slave_port_attr_set(struct net_device *dev,
 271                                    const struct switchdev_attr *attr,
 272                                    struct switchdev_trans *trans)
 273 {
 274         struct dsa_port *dp = dsa_slave_to_port(dev);
 275         int ret;
 276
 277         switch (attr->id) {
 278         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 279                 ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
 280                 break;
 281         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 282                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 283                                               trans);
 284                 break;
 285         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 286                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
 287                 break;
 288         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 289                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 290                                                 trans);
 291                 break;
 292         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 293                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans);
 294                 break;
 295         case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 296                 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, trans);
 297                 break;
 298         default:
 299                 ret = -EOPNOTSUPP;
 300                 break;
 301         }
 302
 303         return ret;
 304 }
 305
 306 static int dsa_slave_vlan_add(struct net_device *dev,
 307                               const struct switchdev_obj *obj,
 308                               struct switchdev_trans *trans)
 309 {
 310         struct dsa_port *dp = dsa_slave_to_port(dev);
 311         struct switchdev_obj_port_vlan vlan;
 312         int err;
 313
 314         if (obj->orig_dev != dev)
 315                 return -EOPNOTSUPP;
 316
 317         if (dsa_port_skip_vlan_configuration(dp))
 318                 return 0;
 319
 320         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 321
 322         err = dsa_port_vlan_add(dp, &vlan, trans);
 323         if (err)
 324                 return err;
 325
 326         /* We need the dedicated CPU port to be a member of the VLAN as well.
 327          * Even though drivers often handle CPU membership in special ways,
 328          * it doesn't make sense to program a PVID, so clear this flag.
 329          */
 330         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 331
 332         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, trans);
 333         if (err)
 334                 return err;
 335
 336         return 0;
 337 }
 338
 339 static int dsa_slave_port_obj_add(struct net_device *dev,
 340                                   const struct switchdev_obj *obj,
 341                                   struct switchdev_trans *trans,
 342                                   struct netlink_ext_ack *extack)
 343 {
 344         struct dsa_port *dp = dsa_slave_to_port(dev);
 345         int err;
 346
 347         /* For the prepare phase, ensure the full set of changes is feasable in
 348          * one go in order to signal a failure properly. If an operation is not
 349          * supported, return -EOPNOTSUPP.
 350          */
 351
 352         switch (obj->id) {
 353         case SWITCHDEV_OBJ_ID_PORT_MDB:
 354                 if (obj->orig_dev != dev)
 355                         return -EOPNOTSUPP;
 356                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 357                 break;
 358         case SWITCHDEV_OBJ_ID_HOST_MDB:
 359                 /* DSA can directly translate this to a normal MDB add,
 360                  * but on the CPU port.
 361                  */
 362                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj),
 363                                        trans);
 364                 break;
 365         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 366                 err = dsa_slave_vlan_add(dev, obj, trans);
 367                 break;
 368         default:
 369                 err = -EOPNOTSUPP;
 370                 break;
 371         }
 372
 373         return err;
 374 }
 375
 376 static int dsa_slave_vlan_del(struct net_device *dev,
 377                               const struct switchdev_obj *obj)
 378 {
 379         struct dsa_port *dp = dsa_slave_to_port(dev);
 380
 381         if (obj->orig_dev != dev)
 382                 return -EOPNOTSUPP;
 383
 384         if (dsa_port_skip_vlan_configuration(dp))
 385                 return 0;
 386
 387         /* Do not deprogram the CPU port as it may be shared with other user
 388          * ports which can be members of this VLAN as well.
 389          */
 390         return dsa_port_vlan_del(dp, SWITCHDEV_OBJ_PORT_VLAN(obj));
 391 }
 392
 393 static int dsa_slave_port_obj_del(struct net_device *dev,
 394                                   const struct switchdev_obj *obj)
 395 {
 396         struct dsa_port *dp = dsa_slave_to_port(dev);
 397         int err;
 398
 399         switch (obj->id) {
 400         case SWITCHDEV_OBJ_ID_PORT_MDB:
 401                 if (obj->orig_dev != dev)
 402                         return -EOPNOTSUPP;
 403                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 404                 break;
 405         case SWITCHDEV_OBJ_ID_HOST_MDB:
 406                 /* DSA can directly translate this to a normal MDB add,
 407                  * but on the CPU port.
 408                  */
 409                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 410                 break;
 411         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 412                 err = dsa_slave_vlan_del(dev, obj);
 413                 break;
 414         default:
 415                 err = -EOPNOTSUPP;
 416                 break;
 417         }
 418
 419         return err;
 420 }
 421
 422 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 423                                         struct netdev_phys_item_id *ppid)
 424 {
 425         struct dsa_port *dp = dsa_slave_to_port(dev);
 426         struct dsa_switch *ds = dp->ds;
 427         struct dsa_switch_tree *dst = ds->dst;
 428
 429         /* For non-legacy ports, devlink is used and it takes
 430          * care of the name generation. This ndo implementation
 431          * should be removed with legacy support.
 432          */
 433         if (dp->ds->devlink)
 434                 return -EOPNOTSUPP;
 435
 436         ppid->id_len = sizeof(dst->index);
 437         memcpy(&ppid->id, &dst->index, ppid->id_len);
 438
 439         return 0;
 440 }
 441
 442 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 443                                                      struct sk_buff *skb)
 444 {
 445 #ifdef CONFIG_NET_POLL_CONTROLLER
 446         struct dsa_slave_priv *p = netdev_priv(dev);
 447
 448         return netpoll_send_skb(p->netpoll, skb);
 449 #else
 450         BUG();
 451         return NETDEV_TX_OK;
 452 #endif
 453 }
 454
 455 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 456                                  struct sk_buff *skb)
 457 {
 458         struct dsa_switch *ds = p->dp->ds;
 459         struct sk_buff *clone;
 460         unsigned int type;
 461
 462         type = ptp_classify_raw(skb);
 463         if (type == PTP_CLASS_NONE)
 464                 return;
 465
 466         if (!ds->ops->port_txtstamp)
 467                 return;
 468
 469         clone = skb_clone_sk(skb);
 470         if (!clone)
 471                 return;
 472
 473         DSA_SKB_CB(skb)->clone = clone;
 474
 475         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type))
 476                 return;
 477
 478         kfree_skb(clone);
 479 }
 480
 481 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 482 {
 483         /* SKB for netpoll still need to be mangled with the protocol-specific
 484          * tag to be successfully transmitted
 485          */
 486         if (unlikely(netpoll_tx_running(dev)))
 487                 return dsa_slave_netpoll_send_skb(dev, skb);
 488
 489         /* Queue the SKB for transmission on the parent interface, but
 490          * do not modify its EtherType
 491          */
 492         skb->dev = dsa_slave_to_master(dev);
 493         dev_queue_xmit(skb);
 494
 495         return NETDEV_TX_OK;
 496 }
 497 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 498
 499 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 500 {
 501         struct dsa_slave_priv *p = netdev_priv(dev);
 502         struct pcpu_sw_netstats *s;
 503         struct sk_buff *nskb;
 504
 505         s = this_cpu_ptr(p->stats64);
 506         u64_stats_update_begin(&s->syncp);
 507         s->tx_packets++;
 508         s->tx_bytes += skb->len;
 509         u64_stats_update_end(&s->syncp);
 510
 511         DSA_SKB_CB(skb)->clone = NULL;
 512
 513         /* Identify PTP protocol packets, clone them, and pass them to the
 514          * switch driver
 515          */
 516         dsa_skb_tx_timestamp(p, skb);
 517
 518         /* Transmit function may have to reallocate the original SKB,
 519          * in which case it must have freed it. Only free it here on error.
 520          */
 521         nskb = p->xmit(skb, dev);
 522         if (!nskb) {
 523                 kfree_skb(skb);
 524                 return NETDEV_TX_OK;
 525         }
 526
 527         return dsa_enqueue_skb(nskb, dev);
 528 }
 529
 530 /* ethtool operations *******************************************************/
 531
 532 static void dsa_slave_get_drvinfo(struct net_device *dev,
 533                                   struct ethtool_drvinfo *drvinfo)
 534 {
 535         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 536         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 537         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 538 }
 539
 540 static int dsa_slave_get_regs_len(struct net_device *dev)
 541 {
 542         struct dsa_port *dp = dsa_slave_to_port(dev);
 543         struct dsa_switch *ds = dp->ds;
 544
 545         if (ds->ops->get_regs_len)
 546                 return ds->ops->get_regs_len(ds, dp->index);
 547
 548         return -EOPNOTSUPP;
 549 }
 550
 551 static void
 552 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 553 {
 554         struct dsa_port *dp = dsa_slave_to_port(dev);
 555         struct dsa_switch *ds = dp->ds;
 556
 557         if (ds->ops->get_regs)
 558                 ds->ops->get_regs(ds, dp->index, regs, _p);
 559 }
 560
 561 static int dsa_slave_nway_reset(struct net_device *dev)
 562 {
 563         struct dsa_port *dp = dsa_slave_to_port(dev);
 564
 565         return phylink_ethtool_nway_reset(dp->pl);
 566 }
 567
 568 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 569 {
 570         struct dsa_port *dp = dsa_slave_to_port(dev);
 571         struct dsa_switch *ds = dp->ds;
 572
 573         if (ds->cd && ds->cd->eeprom_len)
 574                 return ds->cd->eeprom_len;
 575
 576         if (ds->ops->get_eeprom_len)
 577                 return ds->ops->get_eeprom_len(ds);
 578
 579         return 0;
 580 }
 581
 582 static int dsa_slave_get_eeprom(struct net_device *dev,
 583                                 struct ethtool_eeprom *eeprom, u8 *data)
 584 {
 585         struct dsa_port *dp = dsa_slave_to_port(dev);
 586         struct dsa_switch *ds = dp->ds;
 587
 588         if (ds->ops->get_eeprom)
 589                 return ds->ops->get_eeprom(ds, eeprom, data);
 590
 591         return -EOPNOTSUPP;
 592 }
 593
 594 static int dsa_slave_set_eeprom(struct net_device *dev,
 595                                 struct ethtool_eeprom *eeprom, u8 *data)
 596 {
 597         struct dsa_port *dp = dsa_slave_to_port(dev);
 598         struct dsa_switch *ds = dp->ds;
 599
 600         if (ds->ops->set_eeprom)
 601                 return ds->ops->set_eeprom(ds, eeprom, data);
 602
 603         return -EOPNOTSUPP;
 604 }
 605
 606 static void dsa_slave_get_strings(struct net_device *dev,
 607                                   uint32_t stringset, uint8_t *data)
 608 {
 609         struct dsa_port *dp = dsa_slave_to_port(dev);
 610         struct dsa_switch *ds = dp->ds;
 611
 612         if (stringset == ETH_SS_STATS) {
 613                 int len = ETH_GSTRING_LEN;
 614
 615                 strncpy(data, "tx_packets", len);
 616                 strncpy(data + len, "tx_bytes", len);
 617                 strncpy(data + 2 * len, "rx_packets", len);
 618                 strncpy(data + 3 * len, "rx_bytes", len);
 619                 if (ds->ops->get_strings)
 620                         ds->ops->get_strings(ds, dp->index, stringset,
 621                                              data + 4 * len);
 622         }
 623 }
 624
 625 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 626                                         struct ethtool_stats *stats,
 627                                         uint64_t *data)
 628 {
 629         struct dsa_port *dp = dsa_slave_to_port(dev);
 630         struct dsa_slave_priv *p = netdev_priv(dev);
 631         struct dsa_switch *ds = dp->ds;
 632         struct pcpu_sw_netstats *s;
 633         unsigned int start;
 634         int i;
 635
 636         for_each_possible_cpu(i) {
 637                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 638
 639                 s = per_cpu_ptr(p->stats64, i);
 640                 do {
 641                         start = u64_stats_fetch_begin_irq(&s->syncp);
 642                         tx_packets = s->tx_packets;
 643                         tx_bytes = s->tx_bytes;
 644                         rx_packets = s->rx_packets;
 645                         rx_bytes = s->rx_bytes;
 646                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 647                 data[0] += tx_packets;
 648                 data[1] += tx_bytes;
 649                 data[2] += rx_packets;
 650                 data[3] += rx_bytes;
 651         }
 652         if (ds->ops->get_ethtool_stats)
 653                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 654 }
 655
 656 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 657 {
 658         struct dsa_port *dp = dsa_slave_to_port(dev);
 659         struct dsa_switch *ds = dp->ds;
 660
 661         if (sset == ETH_SS_STATS) {
 662                 int count;
 663
 664                 count = 4;
 665                 if (ds->ops->get_sset_count)
 666                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 667
 668                 return count;
 669         }
 670
 671         return -EOPNOTSUPP;
 672 }
 673
 674 static void dsa_slave_get_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
 679         phylink_ethtool_get_wol(dp->pl, w);
 680
 681         if (ds->ops->get_wol)
 682                 ds->ops->get_wol(ds, dp->index, w);
 683 }
 684
 685 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 686 {
 687         struct dsa_port *dp = dsa_slave_to_port(dev);
 688         struct dsa_switch *ds = dp->ds;
 689         int ret = -EOPNOTSUPP;
 690
 691         phylink_ethtool_set_wol(dp->pl, w);
 692
 693         if (ds->ops->set_wol)
 694                 ret = ds->ops->set_wol(ds, dp->index, w);
 695
 696         return ret;
 697 }
 698
 699 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 700 {
 701         struct dsa_port *dp = dsa_slave_to_port(dev);
 702         struct dsa_switch *ds = dp->ds;
 703         int ret;
 704
 705         /* Port's PHY and MAC both need to be EEE capable */
 706         if (!dev->phydev || !dp->pl)
 707                 return -ENODEV;
 708
 709         if (!ds->ops->set_mac_eee)
 710                 return -EOPNOTSUPP;
 711
 712         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 713         if (ret)
 714                 return ret;
 715
 716         return phylink_ethtool_set_eee(dp->pl, e);
 717 }
 718
 719 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 720 {
 721         struct dsa_port *dp = dsa_slave_to_port(dev);
 722         struct dsa_switch *ds = dp->ds;
 723         int ret;
 724
 725         /* Port's PHY and MAC both need to be EEE capable */
 726         if (!dev->phydev || !dp->pl)
 727                 return -ENODEV;
 728
 729         if (!ds->ops->get_mac_eee)
 730                 return -EOPNOTSUPP;
 731
 732         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 733         if (ret)
 734                 return ret;
 735
 736         return phylink_ethtool_get_eee(dp->pl, e);
 737 }
 738
 739 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 740                                         struct ethtool_link_ksettings *cmd)
 741 {
 742         struct dsa_port *dp = dsa_slave_to_port(dev);
 743
 744         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 745 }
 746
 747 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 748                                         const struct ethtool_link_ksettings *cmd)
 749 {
 750         struct dsa_port *dp = dsa_slave_to_port(dev);
 751
 752         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 753 }
 754
 755 static void dsa_slave_get_pauseparam(struct net_device *dev,
 756                                      struct ethtool_pauseparam *pause)
 757 {
 758         struct dsa_port *dp = dsa_slave_to_port(dev);
 759
 760         phylink_ethtool_get_pauseparam(dp->pl, pause);
 761 }
 762
 763 static int dsa_slave_set_pauseparam(struct net_device *dev,
 764                                     struct ethtool_pauseparam *pause)
 765 {
 766         struct dsa_port *dp = dsa_slave_to_port(dev);
 767
 768         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 769 }
 770
 771 #ifdef CONFIG_NET_POLL_CONTROLLER
 772 static int dsa_slave_netpoll_setup(struct net_device *dev,
 773                                    struct netpoll_info *ni)
 774 {
 775         struct net_device *master = dsa_slave_to_master(dev);
 776         struct dsa_slave_priv *p = netdev_priv(dev);
 777         struct netpoll *netpoll;
 778         int err = 0;
 779
 780         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 781         if (!netpoll)
 782                 return -ENOMEM;
 783
 784         err = __netpoll_setup(netpoll, master);
 785         if (err) {
 786                 kfree(netpoll);
 787                 goto out;
 788         }
 789
 790         p->netpoll = netpoll;
 791 out:
 792         return err;
 793 }
 794
 795 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 796 {
 797         struct dsa_slave_priv *p = netdev_priv(dev);
 798         struct netpoll *netpoll = p->netpoll;
 799
 800         if (!netpoll)
 801                 return;
 802
 803         p->netpoll = NULL;
 804
 805         __netpoll_free(netpoll);
 806 }
 807
 808 static void dsa_slave_poll_controller(struct net_device *dev)
 809 {
 810 }
 811 #endif
 812
 813 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 814                                         char *name, size_t len)
 815 {
 816         struct dsa_port *dp = dsa_slave_to_port(dev);
 817
 818         /* For non-legacy ports, devlink is used and it takes
 819          * care of the name generation. This ndo implementation
 820          * should be removed with legacy support.
 821          */
 822         if (dp->ds->devlink)
 823                 return -EOPNOTSUPP;
 824
 825         if (snprintf(name, len, "p%d", dp->index) >= len)
 826                 return -EINVAL;
 827
 828         return 0;
 829 }
 830
 831 static struct dsa_mall_tc_entry *
 832 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 833 {
 834         struct dsa_slave_priv *p = netdev_priv(dev);
 835         struct dsa_mall_tc_entry *mall_tc_entry;
 836
 837         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 838                 if (mall_tc_entry->cookie == cookie)
 839                         return mall_tc_entry;
 840
 841         return NULL;
 842 }
 843
 844 static int
 845 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 846                                   struct tc_cls_matchall_offload *cls,
 847                                   bool ingress)
 848 {
 849         struct dsa_port *dp = dsa_slave_to_port(dev);
 850         struct dsa_slave_priv *p = netdev_priv(dev);
 851         struct dsa_mall_mirror_tc_entry *mirror;
 852         struct dsa_mall_tc_entry *mall_tc_entry;
 853         struct dsa_switch *ds = dp->ds;
 854         struct flow_action_entry *act;
 855         struct dsa_port *to_dp;
 856         int err;
 857
 858         if (!ds->ops->port_mirror_add)
 859                 return -EOPNOTSUPP;
 860
 861         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 862                                               cls->common.extack))
 863                 return -EOPNOTSUPP;
 864
 865         act = &cls->rule->action.entries[0];
 866
 867         if (!act->dev)
 868                 return -EINVAL;
 869
 870         if (!dsa_slave_dev_check(act->dev))
 871                 return -EOPNOTSUPP;
 872
 873         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 874         if (!mall_tc_entry)
 875                 return -ENOMEM;
 876
 877         mall_tc_entry->cookie = cls->cookie;
 878         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 879         mirror = &mall_tc_entry->mirror;
 880
 881         to_dp = dsa_slave_to_port(act->dev);
 882
 883         mirror->to_local_port = to_dp->index;
 884         mirror->ingress = ingress;
 885
 886         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 887         if (err) {
 888                 kfree(mall_tc_entry);
 889                 return err;
 890         }
 891
 892         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 893
 894         return err;
 895 }
 896
 897 static int
 898 dsa_slave_add_cls_matchall_police(struct net_device *dev,
 899                                   struct tc_cls_matchall_offload *cls,
 900                                   bool ingress)
 901 {
 902         struct netlink_ext_ack *extack = cls->common.extack;
 903         struct dsa_port *dp = dsa_slave_to_port(dev);
 904         struct dsa_slave_priv *p = netdev_priv(dev);
 905         struct dsa_mall_policer_tc_entry *policer;
 906         struct dsa_mall_tc_entry *mall_tc_entry;
 907         struct dsa_switch *ds = dp->ds;
 908         struct flow_action_entry *act;
 909         int err;
 910
 911         if (!ds->ops->port_policer_add) {
 912                 NL_SET_ERR_MSG_MOD(extack,
 913                                    "Policing offload not implemented");
 914                 return -EOPNOTSUPP;
 915         }
 916
 917         if (!ingress) {
 918                 NL_SET_ERR_MSG_MOD(extack,
 919                                    "Only supported on ingress qdisc");
 920                 return -EOPNOTSUPP;
 921         }
 922
 923         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 924                                               cls->common.extack))
 925                 return -EOPNOTSUPP;
 926
 927         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
 928                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
 929                         NL_SET_ERR_MSG_MOD(extack,
 930                                            "Only one port policer allowed");
 931                         return -EEXIST;
 932                 }
 933         }
 934
 935         act = &cls->rule->action.entries[0];
 936
 937         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 938         if (!mall_tc_entry)
 939                 return -ENOMEM;
 940
 941         mall_tc_entry->cookie = cls->cookie;
 942         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
 943         policer = &mall_tc_entry->policer;
 944         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
 945         policer->burst = act->police.burst;
 946
 947         err = ds->ops->port_policer_add(ds, dp->index, policer);
 948         if (err) {
 949                 kfree(mall_tc_entry);
 950                 return err;
 951         }
 952
 953         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 954
 955         return err;
 956 }
 957
 958 static int dsa_slave_add_cls_matchall(struct net_device *dev,
 959                                       struct tc_cls_matchall_offload *cls,
 960                                       bool ingress)
 961 {
 962         int err = -EOPNOTSUPP;
 963
 964         if (cls->common.protocol == htons(ETH_P_ALL) &&
 965             flow_offload_has_one_action(&cls->rule->action) &&
 966             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
 967                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
 968         else if (flow_offload_has_one_action(&cls->rule->action) &&
 969                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
 970                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
 971
 972         return err;
 973 }
 974
 975 static void dsa_slave_del_cls_matchall(struct net_device *dev,
 976                                        struct tc_cls_matchall_offload *cls)
 977 {
 978         struct dsa_port *dp = dsa_slave_to_port(dev);
 979         struct dsa_mall_tc_entry *mall_tc_entry;
 980         struct dsa_switch *ds = dp->ds;
 981
 982         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
 983         if (!mall_tc_entry)
 984                 return;
 985
 986         list_del(&mall_tc_entry->list);
 987
 988         switch (mall_tc_entry->type) {
 989         case DSA_PORT_MALL_MIRROR:
 990                 if (ds->ops->port_mirror_del)
 991                         ds->ops->port_mirror_del(ds, dp->index,
 992                                                  &mall_tc_entry->mirror);
 993                 break;
 994         case DSA_PORT_MALL_POLICER:
 995                 if (ds->ops->port_policer_del)
 996                         ds->ops->port_policer_del(ds, dp->index);
 997                 break;
 998         default:
 999                 WARN_ON(1);
1000         }
1001
1002         kfree(mall_tc_entry);
1003 }
1004
1005 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1006                                            struct tc_cls_matchall_offload *cls,
1007                                            bool ingress)
1008 {
1009         if (cls->common.chain_index)
1010                 return -EOPNOTSUPP;
1011
1012         switch (cls->command) {
1013         case TC_CLSMATCHALL_REPLACE:
1014                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1015         case TC_CLSMATCHALL_DESTROY:
1016                 dsa_slave_del_cls_matchall(dev, cls);
1017                 return 0;
1018         default:
1019                 return -EOPNOTSUPP;
1020         }
1021 }
1022
1023 static int dsa_slave_add_cls_flower(struct net_device *dev,
1024                                     struct flow_cls_offload *cls,
1025                                     bool ingress)
1026 {
1027         struct dsa_port *dp = dsa_slave_to_port(dev);
1028         struct dsa_switch *ds = dp->ds;
1029         int port = dp->index;
1030
1031         if (!ds->ops->cls_flower_add)
1032                 return -EOPNOTSUPP;
1033
1034         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1035 }
1036
1037 static int dsa_slave_del_cls_flower(struct net_device *dev,
1038                                     struct flow_cls_offload *cls,
1039                                     bool ingress)
1040 {
1041         struct dsa_port *dp = dsa_slave_to_port(dev);
1042         struct dsa_switch *ds = dp->ds;
1043         int port = dp->index;
1044
1045         if (!ds->ops->cls_flower_del)
1046                 return -EOPNOTSUPP;
1047
1048         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1049 }
1050
1051 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1052                                       struct flow_cls_offload *cls,
1053                                       bool ingress)
1054 {
1055         struct dsa_port *dp = dsa_slave_to_port(dev);
1056         struct dsa_switch *ds = dp->ds;
1057         int port = dp->index;
1058
1059         if (!ds->ops->cls_flower_stats)
1060                 return -EOPNOTSUPP;
1061
1062         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1063 }
1064
1065 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1066                                          struct flow_cls_offload *cls,
1067                                          bool ingress)
1068 {
1069         switch (cls->command) {
1070         case FLOW_CLS_REPLACE:
1071                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1072         case FLOW_CLS_DESTROY:
1073                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1074         case FLOW_CLS_STATS:
1075                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1076         default:
1077                 return -EOPNOTSUPP;
1078         }
1079 }
1080
1081 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1082                                        void *cb_priv, bool ingress)
1083 {
1084         struct net_device *dev = cb_priv;
1085
1086         if (!tc_can_offload(dev))
1087                 return -EOPNOTSUPP;
1088
1089         switch (type) {
1090         case TC_SETUP_CLSMATCHALL:
1091                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1092         case TC_SETUP_CLSFLOWER:
1093                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1094         default:
1095                 return -EOPNOTSUPP;
1096         }
1097 }
1098
1099 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1100                                           void *type_data, void *cb_priv)
1101 {
1102         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1103 }
1104
1105 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1106                                           void *type_data, void *cb_priv)
1107 {
1108         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1109 }
1110
1111 static LIST_HEAD(dsa_slave_block_cb_list);
1112
1113 static int dsa_slave_setup_tc_block(struct net_device *dev,
1114                                     struct flow_block_offload *f)
1115 {
1116         struct flow_block_cb *block_cb;
1117         flow_setup_cb_t *cb;
1118
1119         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1120                 cb = dsa_slave_setup_tc_block_cb_ig;
1121         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1122                 cb = dsa_slave_setup_tc_block_cb_eg;
1123         else
1124                 return -EOPNOTSUPP;
1125
1126         f->driver_block_list = &dsa_slave_block_cb_list;
1127
1128         switch (f->command) {
1129         case FLOW_BLOCK_BIND:
1130                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1131                         return -EBUSY;
1132
1133                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1134                 if (IS_ERR(block_cb))
1135                         return PTR_ERR(block_cb);
1136
1137                 flow_block_cb_add(block_cb, f);
1138                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1139                 return 0;
1140         case FLOW_BLOCK_UNBIND:
1141                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1142                 if (!block_cb)
1143                         return -ENOENT;
1144
1145                 flow_block_cb_remove(block_cb, f);
1146                 list_del(&block_cb->driver_list);
1147                 return 0;
1148         default:
1149                 return -EOPNOTSUPP;
1150         }
1151 }
1152
1153 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1154                               void *type_data)
1155 {
1156         struct dsa_port *dp = dsa_slave_to_port(dev);
1157         struct dsa_switch *ds = dp->ds;
1158
1159         if (type == TC_SETUP_BLOCK)
1160                 return dsa_slave_setup_tc_block(dev, type_data);
1161
1162         if (!ds->ops->port_setup_tc)
1163                 return -EOPNOTSUPP;
1164
1165         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1166 }
1167
1168 static void dsa_slave_get_stats64(struct net_device *dev,
1169                                   struct rtnl_link_stats64 *stats)
1170 {
1171         struct dsa_slave_priv *p = netdev_priv(dev);
1172         struct pcpu_sw_netstats *s;
1173         unsigned int start;
1174         int i;
1175
1176         netdev_stats_to_stats64(stats, &dev->stats);
1177         for_each_possible_cpu(i) {
1178                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
1179
1180                 s = per_cpu_ptr(p->stats64, i);
1181                 do {
1182                         start = u64_stats_fetch_begin_irq(&s->syncp);
1183                         tx_packets = s->tx_packets;
1184                         tx_bytes = s->tx_bytes;
1185                         rx_packets = s->rx_packets;
1186                         rx_bytes = s->rx_bytes;
1187                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
1188
1189                 stats->tx_packets += tx_packets;
1190                 stats->tx_bytes += tx_bytes;
1191                 stats->rx_packets += rx_packets;
1192                 stats->rx_bytes += rx_bytes;
1193         }
1194 }
1195
1196 static int dsa_slave_get_rxnfc(struct net_device *dev,
1197                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1198 {
1199         struct dsa_port *dp = dsa_slave_to_port(dev);
1200         struct dsa_switch *ds = dp->ds;
1201
1202         if (!ds->ops->get_rxnfc)
1203                 return -EOPNOTSUPP;
1204
1205         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1206 }
1207
1208 static int dsa_slave_set_rxnfc(struct net_device *dev,
1209                                struct ethtool_rxnfc *nfc)
1210 {
1211         struct dsa_port *dp = dsa_slave_to_port(dev);
1212         struct dsa_switch *ds = dp->ds;
1213
1214         if (!ds->ops->set_rxnfc)
1215                 return -EOPNOTSUPP;
1216
1217         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1218 }
1219
1220 static int dsa_slave_get_ts_info(struct net_device *dev,
1221                                  struct ethtool_ts_info *ts)
1222 {
1223         struct dsa_slave_priv *p = netdev_priv(dev);
1224         struct dsa_switch *ds = p->dp->ds;
1225
1226         if (!ds->ops->get_ts_info)
1227                 return -EOPNOTSUPP;
1228
1229         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1230 }
1231
1232 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1233                                      u16 vid)
1234 {
1235         struct dsa_port *dp = dsa_slave_to_port(dev);
1236         struct bridge_vlan_info info;
1237         int ret;
1238
1239         /* Check for a possible bridge VLAN entry now since there is no
1240          * need to emulate the switchdev prepare + commit phase.
1241          */
1242         if (dp->bridge_dev) {
1243                 if (dsa_port_skip_vlan_configuration(dp))
1244                         return 0;
1245
1246                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1247                  * device, respectively the VID is not found, returning
1248                  * 0 means success, which is a failure for us here.
1249                  */
1250                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1251                 if (ret == 0)
1252                         return -EBUSY;
1253         }
1254
1255         ret = dsa_port_vid_add(dp, vid, 0);
1256         if (ret)
1257                 return ret;
1258
1259         ret = dsa_port_vid_add(dp->cpu_dp, vid, 0);
1260         if (ret)
1261                 return ret;
1262
1263         return 0;
1264 }
1265
1266 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1267                                       u16 vid)
1268 {
1269         struct dsa_port *dp = dsa_slave_to_port(dev);
1270         struct bridge_vlan_info info;
1271         int ret;
1272
1273         /* Check for a possible bridge VLAN entry now since there is no
1274          * need to emulate the switchdev prepare + commit phase.
1275          */
1276         if (dp->bridge_dev) {
1277                 if (dsa_port_skip_vlan_configuration(dp))
1278                         return 0;
1279
1280                 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1281                  * device, respectively the VID is not found, returning
1282                  * 0 means success, which is a failure for us here.
1283                  */
1284                 ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1285                 if (ret == 0)
1286                         return -EBUSY;
1287         }
1288
1289         /* Do not deprogram the CPU port as it may be shared with other user
1290          * ports which can be members of this VLAN as well.
1291          */
1292         return dsa_port_vid_del(dp, vid);
1293 }
1294
1295 struct dsa_hw_port {
1296         struct list_head list;
1297         struct net_device *dev;
1298         int old_mtu;
1299 };
1300
1301 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1302 {
1303         const struct dsa_hw_port *p;
1304         int err;
1305
1306         list_for_each_entry(p, hw_port_list, list) {
1307                 if (p->dev->mtu == mtu)
1308                         continue;
1309
1310                 err = dev_set_mtu(p->dev, mtu);
1311                 if (err)
1312                         goto rollback;
1313         }
1314
1315         return 0;
1316
1317 rollback:
1318         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1319                 if (p->dev->mtu == p->old_mtu)
1320                         continue;
1321
1322                 if (dev_set_mtu(p->dev, p->old_mtu))
1323                         netdev_err(p->dev, "Failed to restore MTU\n");
1324         }
1325
1326         return err;
1327 }
1328
1329 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1330 {
1331         struct dsa_hw_port *p, *n;
1332
1333         list_for_each_entry_safe(p, n, hw_port_list, list)
1334                 kfree(p);
1335 }
1336
1337 /* Make the hardware datapath to/from @dev limited to a common MTU */
1338 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1339 {
1340         struct list_head hw_port_list;
1341         struct dsa_switch_tree *dst;
1342         int min_mtu = ETH_MAX_MTU;
1343         struct dsa_port *other_dp;
1344         int err;
1345
1346         if (!dp->ds->mtu_enforcement_ingress)
1347                 return;
1348
1349         if (!dp->bridge_dev)
1350                 return;
1351
1352         INIT_LIST_HEAD(&hw_port_list);
1353
1354         /* Populate the list of ports that are part of the same bridge
1355          * as the newly added/modified port
1356          */
1357         list_for_each_entry(dst, &dsa_tree_list, list) {
1358                 list_for_each_entry(other_dp, &dst->ports, list) {
1359                         struct dsa_hw_port *hw_port;
1360                         struct net_device *slave;
1361
1362                         if (other_dp->type != DSA_PORT_TYPE_USER)
1363                                 continue;
1364
1365                         if (other_dp->bridge_dev != dp->bridge_dev)
1366                                 continue;
1367
1368                         if (!other_dp->ds->mtu_enforcement_ingress)
1369                                 continue;
1370
1371                         slave = other_dp->slave;
1372
1373                         if (min_mtu > slave->mtu)
1374                                 min_mtu = slave->mtu;
1375
1376                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1377                         if (!hw_port)
1378                                 goto out;
1379
1380                         hw_port->dev = slave;
1381                         hw_port->old_mtu = slave->mtu;
1382
1383                         list_add(&hw_port->list, &hw_port_list);
1384                 }
1385         }
1386
1387         /* Attempt to configure the entire hardware bridge to the newly added
1388          * interface's MTU first, regardless of whether the intention of the
1389          * user was to raise or lower it.
1390          */
1391         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1392         if (!err)
1393                 goto out;
1394
1395         /* Clearly that didn't work out so well, so just set the minimum MTU on
1396          * all hardware bridge ports now. If this fails too, then all ports will
1397          * still have their old MTU rolled back anyway.
1398          */
1399         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1400
1401 out:
1402         dsa_hw_port_list_free(&hw_port_list);
1403 }
1404
1405 static int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1406 {
1407         struct net_device *master = dsa_slave_to_master(dev);
1408         struct dsa_port *dp = dsa_slave_to_port(dev);
1409         struct dsa_slave_priv *p = netdev_priv(dev);
1410         struct dsa_switch *ds = p->dp->ds;
1411         struct dsa_port *cpu_dp;
1412         int port = p->dp->index;
1413         int largest_mtu = 0;
1414         int new_master_mtu;
1415         int old_master_mtu;
1416         int mtu_limit;
1417         int cpu_mtu;
1418         int err, i;
1419
1420         if (!ds->ops->port_change_mtu)
1421                 return -EOPNOTSUPP;
1422
1423         for (i = 0; i < ds->num_ports; i++) {
1424                 int slave_mtu;
1425
1426                 if (!dsa_is_user_port(ds, i))
1427                         continue;
1428
1429                 /* During probe, this function will be called for each slave
1430                  * device, while not all of them have been allocated. That's
1431                  * ok, it doesn't change what the maximum is, so ignore it.
1432                  */
1433                 if (!dsa_to_port(ds, i)->slave)
1434                         continue;
1435
1436                 /* Pretend that we already applied the setting, which we
1437                  * actually haven't (still haven't done all integrity checks)
1438                  */
1439                 if (i == port)
1440                         slave_mtu = new_mtu;
1441                 else
1442                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1443
1444                 if (largest_mtu < slave_mtu)
1445                         largest_mtu = slave_mtu;
1446         }
1447
1448         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1449
1450         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1451         old_master_mtu = master->mtu;
1452         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1453         if (new_master_mtu > mtu_limit)
1454                 return -ERANGE;
1455
1456         /* If the master MTU isn't over limit, there's no need to check the CPU
1457          * MTU, since that surely isn't either.
1458          */
1459         cpu_mtu = largest_mtu;
1460
1461         /* Start applying stuff */
1462         if (new_master_mtu != old_master_mtu) {
1463                 err = dev_set_mtu(master, new_master_mtu);
1464                 if (err < 0)
1465                         goto out_master_failed;
1466
1467                 /* We only need to propagate the MTU of the CPU port to
1468                  * upstream switches.
1469                  */
1470                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1471                 if (err)
1472                         goto out_cpu_failed;
1473         }
1474
1475         err = dsa_port_mtu_change(dp, new_mtu, false);
1476         if (err)
1477                 goto out_port_failed;
1478
1479         dev->mtu = new_mtu;
1480
1481         dsa_bridge_mtu_normalization(dp);
1482
1483         return 0;
1484
1485 out_port_failed:
1486         if (new_master_mtu != old_master_mtu)
1487                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1488                                     cpu_dp->tag_ops->overhead,
1489                                     true);
1490 out_cpu_failed:
1491         if (new_master_mtu != old_master_mtu)
1492                 dev_set_mtu(master, old_master_mtu);
1493 out_master_failed:
1494         return err;
1495 }
1496
1497 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1498         .get_drvinfo            = dsa_slave_get_drvinfo,
1499         .get_regs_len           = dsa_slave_get_regs_len,
1500         .get_regs               = dsa_slave_get_regs,
1501         .nway_reset             = dsa_slave_nway_reset,
1502         .get_link               = ethtool_op_get_link,
1503         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1504         .get_eeprom             = dsa_slave_get_eeprom,
1505         .set_eeprom             = dsa_slave_set_eeprom,
1506         .get_strings            = dsa_slave_get_strings,
1507         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1508         .get_sset_count         = dsa_slave_get_sset_count,
1509         .set_wol                = dsa_slave_set_wol,
1510         .get_wol                = dsa_slave_get_wol,
1511         .set_eee                = dsa_slave_set_eee,
1512         .get_eee                = dsa_slave_get_eee,
1513         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1514         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1515         .get_pauseparam         = dsa_slave_get_pauseparam,
1516         .set_pauseparam         = dsa_slave_set_pauseparam,
1517         .get_rxnfc              = dsa_slave_get_rxnfc,
1518         .set_rxnfc              = dsa_slave_set_rxnfc,
1519         .get_ts_info            = dsa_slave_get_ts_info,
1520 };
1521
1522 /* legacy way, bypassing the bridge *****************************************/
1523 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1524                        struct net_device *dev,
1525                        const unsigned char *addr, u16 vid,
1526                        u16 flags,
1527                        struct netlink_ext_ack *extack)
1528 {
1529         struct dsa_port *dp = dsa_slave_to_port(dev);
1530
1531         return dsa_port_fdb_add(dp, addr, vid);
1532 }
1533
1534 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1535                        struct net_device *dev,
1536                        const unsigned char *addr, u16 vid)
1537 {
1538         struct dsa_port *dp = dsa_slave_to_port(dev);
1539
1540         return dsa_port_fdb_del(dp, addr, vid);
1541 }
1542
1543 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1544 {
1545         struct dsa_port *dp = dsa_slave_to_port(dev);
1546
1547         return dp->ds->devlink ? &dp->devlink_port : NULL;
1548 }
1549
1550 static const struct net_device_ops dsa_slave_netdev_ops = {
1551         .ndo_open               = dsa_slave_open,
1552         .ndo_stop               = dsa_slave_close,
1553         .ndo_start_xmit         = dsa_slave_xmit,
1554         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1555         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1556         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1557         .ndo_fdb_add            = dsa_legacy_fdb_add,
1558         .ndo_fdb_del            = dsa_legacy_fdb_del,
1559         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1560         .ndo_do_ioctl           = dsa_slave_ioctl,
1561         .ndo_get_iflink         = dsa_slave_get_iflink,
1562 #ifdef CONFIG_NET_POLL_CONTROLLER
1563         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1564         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1565         .ndo_poll_controller    = dsa_slave_poll_controller,
1566 #endif
1567         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1568         .ndo_setup_tc           = dsa_slave_setup_tc,
1569         .ndo_get_stats64        = dsa_slave_get_stats64,
1570         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1571         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1572         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1573         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1574         .ndo_change_mtu         = dsa_slave_change_mtu,
1575 };
1576
1577 static struct device_type dsa_type = {
1578         .name   = "dsa",
1579 };
1580
1581 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1582 {
1583         const struct dsa_port *dp = dsa_to_port(ds, port);
1584
1585         if (dp->pl)
1586                 phylink_mac_change(dp->pl, up);
1587 }
1588 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1589
1590 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1591                                           struct phylink_link_state *state)
1592 {
1593         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1594         struct dsa_switch *ds = dp->ds;
1595
1596         /* No need to check that this operation is valid, the callback would
1597          * not be called if it was not.
1598          */
1599         ds->ops->phylink_fixed_state(ds, dp->index, state);
1600 }
1601
1602 /* slave device setup *******************************************************/
1603 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1604 {
1605         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1606         struct dsa_switch *ds = dp->ds;
1607
1608         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1609         if (!slave_dev->phydev) {
1610                 netdev_err(slave_dev, "no phy at %d\n", addr);
1611                 return -ENODEV;
1612         }
1613
1614         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1615 }
1616
1617 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1618 {
1619         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1620         struct device_node *port_dn = dp->dn;
1621         struct dsa_switch *ds = dp->ds;
1622         phy_interface_t mode;
1623         u32 phy_flags = 0;
1624         int ret;
1625
1626         ret = of_get_phy_mode(port_dn, &mode);
1627         if (ret)
1628                 mode = PHY_INTERFACE_MODE_NA;
1629
1630         dp->pl_config.dev = &slave_dev->dev;
1631         dp->pl_config.type = PHYLINK_NETDEV;
1632
1633         /* The get_fixed_state callback takes precedence over polling the
1634          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1635          * this if the switch provides such a callback.
1636          */
1637         if (ds->ops->phylink_fixed_state) {
1638                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1639                 dp->pl_config.poll_fixed_state = true;
1640         }
1641
1642         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1643                                 &dsa_port_phylink_mac_ops);
1644         if (IS_ERR(dp->pl)) {
1645                 netdev_err(slave_dev,
1646                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1647                 return PTR_ERR(dp->pl);
1648         }
1649
1650         if (ds->ops->get_phy_flags)
1651                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1652
1653         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1654         if (ret == -ENODEV && ds->slave_mii_bus) {
1655                 /* We could not connect to a designated PHY or SFP, so try to
1656                  * use the switch internal MDIO bus instead
1657                  */
1658                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1659                 if (ret) {
1660                         netdev_err(slave_dev,
1661                                    "failed to connect to port %d: %d\n",
1662                                    dp->index, ret);
1663                         phylink_destroy(dp->pl);
1664                         return ret;
1665                 }
1666         }
1667
1668         return ret;
1669 }
1670
1671 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1672 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1673                                             struct netdev_queue *txq,
1674                                             void *_unused)
1675 {
1676         lockdep_set_class(&txq->_xmit_lock,
1677                           &dsa_slave_netdev_xmit_lock_key);
1678 }
1679
1680 int dsa_slave_suspend(struct net_device *slave_dev)
1681 {
1682         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1683
1684         if (!netif_running(slave_dev))
1685                 return 0;
1686
1687         netif_device_detach(slave_dev);
1688
1689         rtnl_lock();
1690         phylink_stop(dp->pl);
1691         rtnl_unlock();
1692
1693         return 0;
1694 }
1695
1696 int dsa_slave_resume(struct net_device *slave_dev)
1697 {
1698         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1699
1700         if (!netif_running(slave_dev))
1701                 return 0;
1702
1703         netif_device_attach(slave_dev);
1704
1705         rtnl_lock();
1706         phylink_start(dp->pl);
1707         rtnl_unlock();
1708
1709         return 0;
1710 }
1711
1712 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1713 {
1714         struct net_device *master = dsa_slave_to_master(dev);
1715         struct dsa_port *dp = dsa_slave_to_port(dev);
1716         struct dsa_notifier_register_info rinfo = {
1717                 .switch_number = dp->ds->index,
1718                 .port_number = dp->index,
1719                 .master = master,
1720                 .info.dev = dev,
1721         };
1722
1723         call_dsa_notifiers(val, dev, &rinfo.info);
1724 }
1725
1726 int dsa_slave_create(struct dsa_port *port)
1727 {
1728         const struct dsa_port *cpu_dp = port->cpu_dp;
1729         struct net_device *master = cpu_dp->master;
1730         struct dsa_switch *ds = port->ds;
1731         const char *name = port->name;
1732         struct net_device *slave_dev;
1733         struct dsa_slave_priv *p;
1734         int ret;
1735
1736         if (!ds->num_tx_queues)
1737                 ds->num_tx_queues = 1;
1738
1739         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1740                                      NET_NAME_UNKNOWN, ether_setup,
1741                                      ds->num_tx_queues, 1);
1742         if (slave_dev == NULL)
1743                 return -ENOMEM;
1744
1745         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1746         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1747                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1748         slave_dev->hw_features |= NETIF_F_HW_TC;
1749         slave_dev->features |= NETIF_F_LLTX;
1750         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1751         if (!IS_ERR_OR_NULL(port->mac))
1752                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1753         else
1754                 eth_hw_addr_inherit(slave_dev, master);
1755         slave_dev->priv_flags |= IFF_NO_QUEUE;
1756         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1757         slave_dev->min_mtu = 0;
1758         if (ds->ops->port_max_mtu)
1759                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1760         else
1761                 slave_dev->max_mtu = ETH_MAX_MTU;
1762         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1763
1764         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1765                                  NULL);
1766
1767         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1768         slave_dev->dev.of_node = port->dn;
1769         slave_dev->vlan_features = master->vlan_features;
1770
1771         p = netdev_priv(slave_dev);
1772         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1773         if (!p->stats64) {
1774                 free_netdev(slave_dev);
1775                 return -ENOMEM;
1776         }
1777
1778         ret = gro_cells_init(&p->gcells, slave_dev);
1779         if (ret)
1780                 goto out_free;
1781
1782         p->dp = port;
1783         INIT_LIST_HEAD(&p->mall_tc_list);
1784         p->xmit = cpu_dp->tag_ops->xmit;
1785         port->slave = slave_dev;
1786
1787         rtnl_lock();
1788         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1789         rtnl_unlock();
1790         if (ret)
1791                 dev_warn(ds->dev, "nonfatal error %d setting MTU on port %d\n",
1792                          ret, port->index);
1793
1794         netif_carrier_off(slave_dev);
1795
1796         ret = dsa_slave_phy_setup(slave_dev);
1797         if (ret) {
1798                 netdev_err(master, "error %d setting up slave phy\n", ret);
1799                 goto out_gcells;
1800         }
1801
1802         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1803
1804         ret = register_netdev(slave_dev);
1805         if (ret) {
1806                 netdev_err(master, "error %d registering interface %s\n",
1807                            ret, slave_dev->name);
1808                 goto out_phy;
1809         }
1810
1811         return 0;
1812
1813 out_phy:
1814         rtnl_lock();
1815         phylink_disconnect_phy(p->dp->pl);
1816         rtnl_unlock();
1817         phylink_destroy(p->dp->pl);
1818 out_gcells:
1819         gro_cells_destroy(&p->gcells);
1820 out_free:
1821         free_percpu(p->stats64);
1822         free_netdev(slave_dev);
1823         port->slave = NULL;
1824         return ret;
1825 }
1826
1827 void dsa_slave_destroy(struct net_device *slave_dev)
1828 {
1829         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1830         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1831
1832         netif_carrier_off(slave_dev);
1833         rtnl_lock();
1834         phylink_disconnect_phy(dp->pl);
1835         rtnl_unlock();
1836
1837         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1838         unregister_netdev(slave_dev);
1839         phylink_destroy(dp->pl);
1840         gro_cells_destroy(&p->gcells);
1841         free_percpu(p->stats64);
1842         free_netdev(slave_dev);
1843 }
1844
1845 bool dsa_slave_dev_check(const struct net_device *dev)
1846 {
1847         return dev->netdev_ops == &dsa_slave_netdev_ops;
1848 }
1849
1850 static int dsa_slave_changeupper(struct net_device *dev,
1851                                  struct netdev_notifier_changeupper_info *info)
1852 {
1853         struct dsa_port *dp = dsa_slave_to_port(dev);
1854         int err = NOTIFY_DONE;
1855
1856         if (netif_is_bridge_master(info->upper_dev)) {
1857                 if (info->linking) {
1858                         err = dsa_port_bridge_join(dp, info->upper_dev);
1859                         if (!err)
1860                                 dsa_bridge_mtu_normalization(dp);
1861                         err = notifier_from_errno(err);
1862                 } else {
1863                         dsa_port_bridge_leave(dp, info->upper_dev);
1864                         err = NOTIFY_OK;
1865                 }
1866         }
1867
1868         return err;
1869 }
1870
1871 static int dsa_slave_upper_vlan_check(struct net_device *dev,
1872                                       struct netdev_notifier_changeupper_info *
1873                                       info)
1874 {
1875         struct netlink_ext_ack *ext_ack;
1876         struct net_device *slave;
1877         struct dsa_port *dp;
1878
1879         ext_ack = netdev_notifier_info_to_extack(&info->info);
1880
1881         if (!is_vlan_dev(dev))
1882                 return NOTIFY_DONE;
1883
1884         slave = vlan_dev_real_dev(dev);
1885         if (!dsa_slave_dev_check(slave))
1886                 return NOTIFY_DONE;
1887
1888         dp = dsa_slave_to_port(slave);
1889         if (!dp->bridge_dev)
1890                 return NOTIFY_DONE;
1891
1892         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1893         if (br_vlan_enabled(dp->bridge_dev) &&
1894             netif_is_bridge_master(info->upper_dev) && info->linking) {
1895                 NL_SET_ERR_MSG_MOD(ext_ack,
1896                                    "Cannot enslave VLAN device into VLAN aware bridge");
1897                 return notifier_from_errno(-EINVAL);
1898         }
1899
1900         return NOTIFY_DONE;
1901 }
1902
1903 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1904                                      unsigned long event, void *ptr)
1905 {
1906         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1907
1908         if (event == NETDEV_CHANGEUPPER) {
1909                 if (!dsa_slave_dev_check(dev))
1910                         return dsa_slave_upper_vlan_check(dev, ptr);
1911
1912                 return dsa_slave_changeupper(dev, ptr);
1913         }
1914
1915         return NOTIFY_DONE;
1916 }
1917
1918 struct dsa_switchdev_event_work {
1919         struct work_struct work;
1920         struct switchdev_notifier_fdb_info fdb_info;
1921         struct net_device *dev;
1922         unsigned long event;
1923 };
1924
1925 static void dsa_slave_switchdev_event_work(struct work_struct *work)
1926 {
1927         struct dsa_switchdev_event_work *switchdev_work =
1928                 container_of(work, struct dsa_switchdev_event_work, work);
1929         struct net_device *dev = switchdev_work->dev;
1930         struct switchdev_notifier_fdb_info *fdb_info;
1931         struct dsa_port *dp = dsa_slave_to_port(dev);
1932         int err;
1933
1934         rtnl_lock();
1935         switch (switchdev_work->event) {
1936         case SWITCHDEV_FDB_ADD_TO_DEVICE:
1937                 fdb_info = &switchdev_work->fdb_info;
1938                 if (!fdb_info->added_by_user)
1939                         break;
1940
1941                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
1942                 if (err) {
1943                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
1944                         break;
1945                 }
1946                 fdb_info->offloaded = true;
1947                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
1948                                          &fdb_info->info, NULL);
1949                 break;
1950
1951         case SWITCHDEV_FDB_DEL_TO_DEVICE:
1952                 fdb_info = &switchdev_work->fdb_info;
1953                 if (!fdb_info->added_by_user)
1954                         break;
1955
1956                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
1957                 if (err) {
1958                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
1959                         dev_close(dev);
1960                 }
1961                 break;
1962         }
1963         rtnl_unlock();
1964
1965         kfree(switchdev_work->fdb_info.addr);
1966         kfree(switchdev_work);
1967         dev_put(dev);
1968 }
1969
1970 static int
1971 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
1972                                   switchdev_work,
1973                                   const struct switchdev_notifier_fdb_info *
1974                                   fdb_info)
1975 {
1976         memcpy(&switchdev_work->fdb_info, fdb_info,
1977                sizeof(switchdev_work->fdb_info));
1978         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
1979         if (!switchdev_work->fdb_info.addr)
1980                 return -ENOMEM;
1981         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
1982                         fdb_info->addr);
1983         return 0;
1984 }
1985
1986 /* Called under rcu_read_lock() */
1987 static int dsa_slave_switchdev_event(struct notifier_block *unused,
1988                                      unsigned long event, void *ptr)
1989 {
1990         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
1991         struct dsa_switchdev_event_work *switchdev_work;
1992         int err;
1993
1994         if (event == SWITCHDEV_PORT_ATTR_SET) {
1995                 err = switchdev_handle_port_attr_set(dev, ptr,
1996                                                      dsa_slave_dev_check,
1997                                                      dsa_slave_port_attr_set);
1998                 return notifier_from_errno(err);
1999         }
2000
2001         if (!dsa_slave_dev_check(dev))
2002                 return NOTIFY_DONE;
2003
2004         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2005         if (!switchdev_work)
2006                 return NOTIFY_BAD;
2007
2008         INIT_WORK(&switchdev_work->work,
2009                   dsa_slave_switchdev_event_work);
2010         switchdev_work->dev = dev;
2011         switchdev_work->event = event;
2012
2013         switch (event) {
2014         case SWITCHDEV_FDB_ADD_TO_DEVICE: /* fall through */
2015         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2016                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
2017                         goto err_fdb_work_init;
2018                 dev_hold(dev);
2019                 break;
2020         default:
2021                 kfree(switchdev_work);
2022                 return NOTIFY_DONE;
2023         }
2024
2025         dsa_schedule_work(&switchdev_work->work);
2026         return NOTIFY_OK;
2027
2028 err_fdb_work_init:
2029         kfree(switchdev_work);
2030         return NOTIFY_BAD;
2031 }
2032
2033 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2034                                               unsigned long event, void *ptr)
2035 {
2036         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2037         int err;
2038
2039         switch (event) {
2040         case SWITCHDEV_PORT_OBJ_ADD:
2041                 err = switchdev_handle_port_obj_add(dev, ptr,
2042                                                     dsa_slave_dev_check,
2043                                                     dsa_slave_port_obj_add);
2044                 return notifier_from_errno(err);
2045         case SWITCHDEV_PORT_OBJ_DEL:
2046                 err = switchdev_handle_port_obj_del(dev, ptr,
2047                                                     dsa_slave_dev_check,
2048                                                     dsa_slave_port_obj_del);
2049                 return notifier_from_errno(err);
2050         case SWITCHDEV_PORT_ATTR_SET:
2051                 err = switchdev_handle_port_attr_set(dev, ptr,
2052                                                      dsa_slave_dev_check,
2053                                                      dsa_slave_port_attr_set);
2054                 return notifier_from_errno(err);
2055         }
2056
2057         return NOTIFY_DONE;
2058 }
2059
2060 static struct notifier_block dsa_slave_nb __read_mostly = {
2061         .notifier_call  = dsa_slave_netdevice_event,
2062 };
2063
2064 static struct notifier_block dsa_slave_switchdev_notifier = {
2065         .notifier_call = dsa_slave_switchdev_event,
2066 };
2067
2068 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2069         .notifier_call = dsa_slave_switchdev_blocking_event,
2070 };
2071
2072 int dsa_slave_register_notifier(void)
2073 {
2074         struct notifier_block *nb;
2075         int err;
2076
2077         err = register_netdevice_notifier(&dsa_slave_nb);
2078         if (err)
2079                 return err;
2080
2081         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2082         if (err)
2083                 goto err_switchdev_nb;
2084
2085         nb = &dsa_slave_switchdev_blocking_notifier;
2086         err = register_switchdev_blocking_notifier(nb);
2087         if (err)
2088                 goto err_switchdev_blocking_nb;
2089
2090         return 0;
2091
2092 err_switchdev_blocking_nb:
2093         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2094 err_switchdev_nb:
2095         unregister_netdevice_notifier(&dsa_slave_nb);
2096         return err;
2097 }
2098
2099 void dsa_slave_unregister_notifier(void)
2100 {
2101         struct notifier_block *nb;
2102         int err;
2103
2104         nb = &dsa_slave_switchdev_blocking_notifier;
2105         err = unregister_switchdev_blocking_notifier(nb);
2106         if (err)
2107                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2108
2109         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2110         if (err)
2111                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2112
2113         err = unregister_netdevice_notifier(&dsa_slave_nb);
2114         if (err)
2115                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2116 }