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/selftests.h>
  19 #include <net/tc_act/tc_mirred.h>
  20 #include <linux/if_bridge.h>
  21 #include <linux/if_hsr.h>
  22 #include <linux/netpoll.h>
  23
  24 #include "dsa_priv.h"
  25
  26 /* slave mii_bus handling ***************************************************/
  27 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  28 {
  29         struct dsa_switch *ds = bus->priv;
  30
  31         if (ds->phys_mii_mask & (1 << addr))
  32                 return ds->ops->phy_read(ds, addr, reg);
  33
  34         return 0xffff;
  35 }
  36
  37 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  38 {
  39         struct dsa_switch *ds = bus->priv;
  40
  41         if (ds->phys_mii_mask & (1 << addr))
  42                 return ds->ops->phy_write(ds, addr, reg, val);
  43
  44         return 0;
  45 }
  46
  47 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  48 {
  49         ds->slave_mii_bus->priv = (void *)ds;
  50         ds->slave_mii_bus->name = "dsa slave smi";
  51         ds->slave_mii_bus->read = dsa_slave_phy_read;
  52         ds->slave_mii_bus->write = dsa_slave_phy_write;
  53         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  54                  ds->dst->index, ds->index);
  55         ds->slave_mii_bus->parent = ds->dev;
  56         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  57 }
  58
  59
  60 /* slave device handling ****************************************************/
  61 static int dsa_slave_get_iflink(const struct net_device *dev)
  62 {
  63         return dsa_slave_to_master(dev)->ifindex;
  64 }
  65
  66 static int dsa_slave_open(struct net_device *dev)
  67 {
  68         struct net_device *master = dsa_slave_to_master(dev);
  69         struct dsa_port *dp = dsa_slave_to_port(dev);
  70         int err;
  71
  72         err = dev_open(master, NULL);
  73         if (err < 0) {
  74                 netdev_err(dev, "failed to open master %s\n", master->name);
  75                 goto out;
  76         }
  77
  78         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  79                 err = dev_uc_add(master, dev->dev_addr);
  80                 if (err < 0)
  81                         goto out;
  82         }
  83
  84         if (dev->flags & IFF_ALLMULTI) {
  85                 err = dev_set_allmulti(master, 1);
  86                 if (err < 0)
  87                         goto del_unicast;
  88         }
  89         if (dev->flags & IFF_PROMISC) {
  90                 err = dev_set_promiscuity(master, 1);
  91                 if (err < 0)
  92                         goto clear_allmulti;
  93         }
  94
  95         err = dsa_port_enable_rt(dp, dev->phydev);
  96         if (err)
  97                 goto clear_promisc;
  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         dsa_port_disable_rt(dp);
 120
 121         dev_mc_unsync(master, dev);
 122         dev_uc_unsync(master, dev);
 123         if (dev->flags & IFF_ALLMULTI)
 124                 dev_set_allmulti(master, -1);
 125         if (dev->flags & IFF_PROMISC)
 126                 dev_set_promiscuity(master, -1);
 127
 128         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 129                 dev_uc_del(master, dev->dev_addr);
 130
 131         return 0;
 132 }
 133
 134 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 135 {
 136         struct net_device *master = dsa_slave_to_master(dev);
 137         if (dev->flags & IFF_UP) {
 138                 if (change & IFF_ALLMULTI)
 139                         dev_set_allmulti(master,
 140                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 141                 if (change & IFF_PROMISC)
 142                         dev_set_promiscuity(master,
 143                                             dev->flags & IFF_PROMISC ? 1 : -1);
 144         }
 145 }
 146
 147 static void dsa_slave_set_rx_mode(struct net_device *dev)
 148 {
 149         struct net_device *master = dsa_slave_to_master(dev);
 150
 151         dev_mc_sync(master, dev);
 152         dev_uc_sync(master, dev);
 153 }
 154
 155 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 156 {
 157         struct net_device *master = dsa_slave_to_master(dev);
 158         struct sockaddr *addr = a;
 159         int err;
 160
 161         if (!is_valid_ether_addr(addr->sa_data))
 162                 return -EADDRNOTAVAIL;
 163
 164         if (!(dev->flags & IFF_UP))
 165                 goto out;
 166
 167         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 168                 err = dev_uc_add(master, addr->sa_data);
 169                 if (err < 0)
 170                         return err;
 171         }
 172
 173         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 174                 dev_uc_del(master, dev->dev_addr);
 175
 176 out:
 177         ether_addr_copy(dev->dev_addr, addr->sa_data);
 178
 179         return 0;
 180 }
 181
 182 struct dsa_slave_dump_ctx {
 183         struct net_device *dev;
 184         struct sk_buff *skb;
 185         struct netlink_callback *cb;
 186         int idx;
 187 };
 188
 189 static int
 190 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 191                            bool is_static, void *data)
 192 {
 193         struct dsa_slave_dump_ctx *dump = data;
 194         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 195         u32 seq = dump->cb->nlh->nlmsg_seq;
 196         struct nlmsghdr *nlh;
 197         struct ndmsg *ndm;
 198
 199         if (dump->idx < dump->cb->args[2])
 200                 goto skip;
 201
 202         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 203                         sizeof(*ndm), NLM_F_MULTI);
 204         if (!nlh)
 205                 return -EMSGSIZE;
 206
 207         ndm = nlmsg_data(nlh);
 208         ndm->ndm_family  = AF_BRIDGE;
 209         ndm->ndm_pad1    = 0;
 210         ndm->ndm_pad2    = 0;
 211         ndm->ndm_flags   = NTF_SELF;
 212         ndm->ndm_type    = 0;
 213         ndm->ndm_ifindex = dump->dev->ifindex;
 214         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 215
 216         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 217                 goto nla_put_failure;
 218
 219         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 220                 goto nla_put_failure;
 221
 222         nlmsg_end(dump->skb, nlh);
 223
 224 skip:
 225         dump->idx++;
 226         return 0;
 227
 228 nla_put_failure:
 229         nlmsg_cancel(dump->skb, nlh);
 230         return -EMSGSIZE;
 231 }
 232
 233 static int
 234 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 235                    struct net_device *dev, struct net_device *filter_dev,
 236                    int *idx)
 237 {
 238         struct dsa_port *dp = dsa_slave_to_port(dev);
 239         struct dsa_slave_dump_ctx dump = {
 240                 .dev = dev,
 241                 .skb = skb,
 242                 .cb = cb,
 243                 .idx = *idx,
 244         };
 245         int err;
 246
 247         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 248         *idx = dump.idx;
 249
 250         return err;
 251 }
 252
 253 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 254 {
 255         struct dsa_slave_priv *p = netdev_priv(dev);
 256         struct dsa_switch *ds = p->dp->ds;
 257         int port = p->dp->index;
 258
 259         /* Pass through to switch driver if it supports timestamping */
 260         switch (cmd) {
 261         case SIOCGHWTSTAMP:
 262                 if (ds->ops->port_hwtstamp_get)
 263                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 264                 break;
 265         case SIOCSHWTSTAMP:
 266                 if (ds->ops->port_hwtstamp_set)
 267                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 268                 break;
 269         }
 270
 271         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 272 }
 273
 274 static int dsa_slave_port_attr_set(struct net_device *dev, const void *ctx,
 275                                    const struct switchdev_attr *attr,
 276                                    struct netlink_ext_ack *extack)
 277 {
 278         struct dsa_port *dp = dsa_slave_to_port(dev);
 279         int ret;
 280
 281         if (ctx && ctx != dp)
 282                 return 0;
 283
 284         switch (attr->id) {
 285         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 286                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 287                         return -EOPNOTSUPP;
 288
 289                 ret = dsa_port_set_state(dp, attr->u.stp_state);
 290                 break;
 291         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 292                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 293                         return -EOPNOTSUPP;
 294
 295                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 296                                               extack);
 297                 break;
 298         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 299                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 300                         return -EOPNOTSUPP;
 301
 302                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 303                 break;
 304         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 305                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 306                         return -EOPNOTSUPP;
 307
 308                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 309                                                 extack);
 310                 break;
 311         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 312                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 313                         return -EOPNOTSUPP;
 314
 315                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 316                 break;
 317         case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 318                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 319                         return -EOPNOTSUPP;
 320
 321                 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, extack);
 322                 break;
 323         default:
 324                 ret = -EOPNOTSUPP;
 325                 break;
 326         }
 327
 328         return ret;
 329 }
 330
 331 /* Must be called under rcu_read_lock() */
 332 static int
 333 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 334                                       const struct switchdev_obj_port_vlan *vlan)
 335 {
 336         struct net_device *upper_dev;
 337         struct list_head *iter;
 338
 339         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 340                 u16 vid;
 341
 342                 if (!is_vlan_dev(upper_dev))
 343                         continue;
 344
 345                 vid = vlan_dev_vlan_id(upper_dev);
 346                 if (vid == vlan->vid)
 347                         return -EBUSY;
 348         }
 349
 350         return 0;
 351 }
 352
 353 static int dsa_slave_vlan_add(struct net_device *dev,
 354                               const struct switchdev_obj *obj,
 355                               struct netlink_ext_ack *extack)
 356 {
 357         struct net_device *master = dsa_slave_to_master(dev);
 358         struct dsa_port *dp = dsa_slave_to_port(dev);
 359         struct switchdev_obj_port_vlan vlan;
 360         int err;
 361
 362         if (dsa_port_skip_vlan_configuration(dp)) {
 363                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 364                 return 0;
 365         }
 366
 367         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 368
 369         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 370          * the same VID.
 371          */
 372         if (br_vlan_enabled(dp->bridge_dev)) {
 373                 rcu_read_lock();
 374                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
 375                 rcu_read_unlock();
 376                 if (err) {
 377                         NL_SET_ERR_MSG_MOD(extack,
 378                                            "Port already has a VLAN upper with this VID");
 379                         return err;
 380                 }
 381         }
 382
 383         err = dsa_port_vlan_add(dp, &vlan, extack);
 384         if (err)
 385                 return err;
 386
 387         /* We need the dedicated CPU port to be a member of the VLAN as well.
 388          * Even though drivers often handle CPU membership in special ways,
 389          * it doesn't make sense to program a PVID, so clear this flag.
 390          */
 391         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 392
 393         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, extack);
 394         if (err)
 395                 return err;
 396
 397         return vlan_vid_add(master, htons(ETH_P_8021Q), vlan.vid);
 398 }
 399
 400 static int dsa_slave_port_obj_add(struct net_device *dev, const void *ctx,
 401                                   const struct switchdev_obj *obj,
 402                                   struct netlink_ext_ack *extack)
 403 {
 404         struct dsa_port *dp = dsa_slave_to_port(dev);
 405         int err;
 406
 407         if (ctx && ctx != dp)
 408                 return 0;
 409
 410         switch (obj->id) {
 411         case SWITCHDEV_OBJ_ID_PORT_MDB:
 412                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 413                         return -EOPNOTSUPP;
 414
 415                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 416                 break;
 417         case SWITCHDEV_OBJ_ID_HOST_MDB:
 418                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 419                         return -EOPNOTSUPP;
 420
 421                 err = dsa_port_host_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 422                 break;
 423         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 424                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 425                         return -EOPNOTSUPP;
 426
 427                 err = dsa_slave_vlan_add(dev, obj, extack);
 428                 break;
 429         case SWITCHDEV_OBJ_ID_MRP:
 430                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 431                         return -EOPNOTSUPP;
 432
 433                 err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 434                 break;
 435         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 436                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 437                         return -EOPNOTSUPP;
 438
 439                 err = dsa_port_mrp_add_ring_role(dp,
 440                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 441                 break;
 442         default:
 443                 err = -EOPNOTSUPP;
 444                 break;
 445         }
 446
 447         return err;
 448 }
 449
 450 static int dsa_slave_vlan_del(struct net_device *dev,
 451                               const struct switchdev_obj *obj)
 452 {
 453         struct net_device *master = dsa_slave_to_master(dev);
 454         struct dsa_port *dp = dsa_slave_to_port(dev);
 455         struct switchdev_obj_port_vlan *vlan;
 456         int err;
 457
 458         if (dsa_port_skip_vlan_configuration(dp))
 459                 return 0;
 460
 461         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 462
 463         /* Do not deprogram the CPU port as it may be shared with other user
 464          * ports which can be members of this VLAN as well.
 465          */
 466         err = dsa_port_vlan_del(dp, vlan);
 467         if (err)
 468                 return err;
 469
 470         vlan_vid_del(master, htons(ETH_P_8021Q), vlan->vid);
 471
 472         return 0;
 473 }
 474
 475 static int dsa_slave_port_obj_del(struct net_device *dev, const void *ctx,
 476                                   const struct switchdev_obj *obj)
 477 {
 478         struct dsa_port *dp = dsa_slave_to_port(dev);
 479         int err;
 480
 481         if (ctx && ctx != dp)
 482                 return 0;
 483
 484         switch (obj->id) {
 485         case SWITCHDEV_OBJ_ID_PORT_MDB:
 486                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 487                         return -EOPNOTSUPP;
 488
 489                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 490                 break;
 491         case SWITCHDEV_OBJ_ID_HOST_MDB:
 492                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 493                         return -EOPNOTSUPP;
 494
 495                 err = dsa_port_host_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 496                 break;
 497         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 498                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 499                         return -EOPNOTSUPP;
 500
 501                 err = dsa_slave_vlan_del(dev, obj);
 502                 break;
 503         case SWITCHDEV_OBJ_ID_MRP:
 504                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 505                         return -EOPNOTSUPP;
 506
 507                 err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 508                 break;
 509         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 510                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 511                         return -EOPNOTSUPP;
 512
 513                 err = dsa_port_mrp_del_ring_role(dp,
 514                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 515                 break;
 516         default:
 517                 err = -EOPNOTSUPP;
 518                 break;
 519         }
 520
 521         return err;
 522 }
 523
 524 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 525                                         struct netdev_phys_item_id *ppid)
 526 {
 527         struct dsa_port *dp = dsa_slave_to_port(dev);
 528         struct dsa_switch *ds = dp->ds;
 529         struct dsa_switch_tree *dst = ds->dst;
 530
 531         /* For non-legacy ports, devlink is used and it takes
 532          * care of the name generation. This ndo implementation
 533          * should be removed with legacy support.
 534          */
 535         if (dp->ds->devlink)
 536                 return -EOPNOTSUPP;
 537
 538         ppid->id_len = sizeof(dst->index);
 539         memcpy(&ppid->id, &dst->index, ppid->id_len);
 540
 541         return 0;
 542 }
 543
 544 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 545                                                      struct sk_buff *skb)
 546 {
 547 #ifdef CONFIG_NET_POLL_CONTROLLER
 548         struct dsa_slave_priv *p = netdev_priv(dev);
 549
 550         return netpoll_send_skb(p->netpoll, skb);
 551 #else
 552         BUG();
 553         return NETDEV_TX_OK;
 554 #endif
 555 }
 556
 557 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 558                                  struct sk_buff *skb)
 559 {
 560         struct dsa_switch *ds = p->dp->ds;
 561
 562         if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 563                 return;
 564
 565         if (!ds->ops->port_txtstamp)
 566                 return;
 567
 568         ds->ops->port_txtstamp(ds, p->dp->index, skb);
 569 }
 570
 571 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 572 {
 573         /* SKB for netpoll still need to be mangled with the protocol-specific
 574          * tag to be successfully transmitted
 575          */
 576         if (unlikely(netpoll_tx_running(dev)))
 577                 return dsa_slave_netpoll_send_skb(dev, skb);
 578
 579         /* Queue the SKB for transmission on the parent interface, but
 580          * do not modify its EtherType
 581          */
 582         skb->dev = dsa_slave_to_master(dev);
 583         dev_queue_xmit(skb);
 584
 585         return NETDEV_TX_OK;
 586 }
 587 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 588
 589 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 590 {
 591         int needed_headroom = dev->needed_headroom;
 592         int needed_tailroom = dev->needed_tailroom;
 593
 594         /* For tail taggers, we need to pad short frames ourselves, to ensure
 595          * that the tail tag does not fail at its role of being at the end of
 596          * the packet, once the master interface pads the frame. Account for
 597          * that pad length here, and pad later.
 598          */
 599         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 600                 needed_tailroom += ETH_ZLEN - skb->len;
 601         /* skb_headroom() returns unsigned int... */
 602         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 603         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 604
 605         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 606                 /* No reallocation needed, yay! */
 607                 return 0;
 608
 609         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 610                                 GFP_ATOMIC);
 611 }
 612
 613 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 614 {
 615         struct dsa_slave_priv *p = netdev_priv(dev);
 616         struct sk_buff *nskb;
 617
 618         dev_sw_netstats_tx_add(dev, 1, skb->len);
 619
 620         memset(skb->cb, 0, sizeof(skb->cb));
 621
 622         /* Handle tx timestamp if any */
 623         dsa_skb_tx_timestamp(p, skb);
 624
 625         if (dsa_realloc_skb(skb, dev)) {
 626                 dev_kfree_skb_any(skb);
 627                 return NETDEV_TX_OK;
 628         }
 629
 630         /* needed_tailroom should still be 'warm' in the cache line from
 631          * dsa_realloc_skb(), which has also ensured that padding is safe.
 632          */
 633         if (dev->needed_tailroom)
 634                 eth_skb_pad(skb);
 635
 636         /* Transmit function may have to reallocate the original SKB,
 637          * in which case it must have freed it. Only free it here on error.
 638          */
 639         nskb = p->xmit(skb, dev);
 640         if (!nskb) {
 641                 kfree_skb(skb);
 642                 return NETDEV_TX_OK;
 643         }
 644
 645         return dsa_enqueue_skb(nskb, dev);
 646 }
 647
 648 /* ethtool operations *******************************************************/
 649
 650 static void dsa_slave_get_drvinfo(struct net_device *dev,
 651                                   struct ethtool_drvinfo *drvinfo)
 652 {
 653         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 654         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 655         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 656 }
 657
 658 static int dsa_slave_get_regs_len(struct net_device *dev)
 659 {
 660         struct dsa_port *dp = dsa_slave_to_port(dev);
 661         struct dsa_switch *ds = dp->ds;
 662
 663         if (ds->ops->get_regs_len)
 664                 return ds->ops->get_regs_len(ds, dp->index);
 665
 666         return -EOPNOTSUPP;
 667 }
 668
 669 static void
 670 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 671 {
 672         struct dsa_port *dp = dsa_slave_to_port(dev);
 673         struct dsa_switch *ds = dp->ds;
 674
 675         if (ds->ops->get_regs)
 676                 ds->ops->get_regs(ds, dp->index, regs, _p);
 677 }
 678
 679 static int dsa_slave_nway_reset(struct net_device *dev)
 680 {
 681         struct dsa_port *dp = dsa_slave_to_port(dev);
 682
 683         return phylink_ethtool_nway_reset(dp->pl);
 684 }
 685
 686 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 687 {
 688         struct dsa_port *dp = dsa_slave_to_port(dev);
 689         struct dsa_switch *ds = dp->ds;
 690
 691         if (ds->cd && ds->cd->eeprom_len)
 692                 return ds->cd->eeprom_len;
 693
 694         if (ds->ops->get_eeprom_len)
 695                 return ds->ops->get_eeprom_len(ds);
 696
 697         return 0;
 698 }
 699
 700 static int dsa_slave_get_eeprom(struct net_device *dev,
 701                                 struct ethtool_eeprom *eeprom, u8 *data)
 702 {
 703         struct dsa_port *dp = dsa_slave_to_port(dev);
 704         struct dsa_switch *ds = dp->ds;
 705
 706         if (ds->ops->get_eeprom)
 707                 return ds->ops->get_eeprom(ds, eeprom, data);
 708
 709         return -EOPNOTSUPP;
 710 }
 711
 712 static int dsa_slave_set_eeprom(struct net_device *dev,
 713                                 struct ethtool_eeprom *eeprom, u8 *data)
 714 {
 715         struct dsa_port *dp = dsa_slave_to_port(dev);
 716         struct dsa_switch *ds = dp->ds;
 717
 718         if (ds->ops->set_eeprom)
 719                 return ds->ops->set_eeprom(ds, eeprom, data);
 720
 721         return -EOPNOTSUPP;
 722 }
 723
 724 static void dsa_slave_get_strings(struct net_device *dev,
 725                                   uint32_t stringset, uint8_t *data)
 726 {
 727         struct dsa_port *dp = dsa_slave_to_port(dev);
 728         struct dsa_switch *ds = dp->ds;
 729
 730         if (stringset == ETH_SS_STATS) {
 731                 int len = ETH_GSTRING_LEN;
 732
 733                 strncpy(data, "tx_packets", len);
 734                 strncpy(data + len, "tx_bytes", len);
 735                 strncpy(data + 2 * len, "rx_packets", len);
 736                 strncpy(data + 3 * len, "rx_bytes", len);
 737                 if (ds->ops->get_strings)
 738                         ds->ops->get_strings(ds, dp->index, stringset,
 739                                              data + 4 * len);
 740         } else if (stringset ==  ETH_SS_TEST) {
 741                 net_selftest_get_strings(data);
 742         }
 743
 744 }
 745
 746 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 747                                         struct ethtool_stats *stats,
 748                                         uint64_t *data)
 749 {
 750         struct dsa_port *dp = dsa_slave_to_port(dev);
 751         struct dsa_switch *ds = dp->ds;
 752         struct pcpu_sw_netstats *s;
 753         unsigned int start;
 754         int i;
 755
 756         for_each_possible_cpu(i) {
 757                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 758
 759                 s = per_cpu_ptr(dev->tstats, i);
 760                 do {
 761                         start = u64_stats_fetch_begin_irq(&s->syncp);
 762                         tx_packets = s->tx_packets;
 763                         tx_bytes = s->tx_bytes;
 764                         rx_packets = s->rx_packets;
 765                         rx_bytes = s->rx_bytes;
 766                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 767                 data[0] += tx_packets;
 768                 data[1] += tx_bytes;
 769                 data[2] += rx_packets;
 770                 data[3] += rx_bytes;
 771         }
 772         if (ds->ops->get_ethtool_stats)
 773                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 774 }
 775
 776 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 777 {
 778         struct dsa_port *dp = dsa_slave_to_port(dev);
 779         struct dsa_switch *ds = dp->ds;
 780
 781         if (sset == ETH_SS_STATS) {
 782                 int count = 0;
 783
 784                 if (ds->ops->get_sset_count) {
 785                         count = ds->ops->get_sset_count(ds, dp->index, sset);
 786                         if (count < 0)
 787                                 return count;
 788                 }
 789
 790                 return count + 4;
 791         } else if (sset ==  ETH_SS_TEST) {
 792                 return net_selftest_get_count();
 793         }
 794
 795         return -EOPNOTSUPP;
 796 }
 797
 798 static void dsa_slave_net_selftest(struct net_device *ndev,
 799                                    struct ethtool_test *etest, u64 *buf)
 800 {
 801         struct dsa_port *dp = dsa_slave_to_port(ndev);
 802         struct dsa_switch *ds = dp->ds;
 803
 804         if (ds->ops->self_test) {
 805                 ds->ops->self_test(ds, dp->index, etest, buf);
 806                 return;
 807         }
 808
 809         net_selftest(ndev, etest, buf);
 810 }
 811
 812 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 813 {
 814         struct dsa_port *dp = dsa_slave_to_port(dev);
 815         struct dsa_switch *ds = dp->ds;
 816
 817         phylink_ethtool_get_wol(dp->pl, w);
 818
 819         if (ds->ops->get_wol)
 820                 ds->ops->get_wol(ds, dp->index, w);
 821 }
 822
 823 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 824 {
 825         struct dsa_port *dp = dsa_slave_to_port(dev);
 826         struct dsa_switch *ds = dp->ds;
 827         int ret = -EOPNOTSUPP;
 828
 829         phylink_ethtool_set_wol(dp->pl, w);
 830
 831         if (ds->ops->set_wol)
 832                 ret = ds->ops->set_wol(ds, dp->index, w);
 833
 834         return ret;
 835 }
 836
 837 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 838 {
 839         struct dsa_port *dp = dsa_slave_to_port(dev);
 840         struct dsa_switch *ds = dp->ds;
 841         int ret;
 842
 843         /* Port's PHY and MAC both need to be EEE capable */
 844         if (!dev->phydev || !dp->pl)
 845                 return -ENODEV;
 846
 847         if (!ds->ops->set_mac_eee)
 848                 return -EOPNOTSUPP;
 849
 850         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 851         if (ret)
 852                 return ret;
 853
 854         return phylink_ethtool_set_eee(dp->pl, e);
 855 }
 856
 857 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 858 {
 859         struct dsa_port *dp = dsa_slave_to_port(dev);
 860         struct dsa_switch *ds = dp->ds;
 861         int ret;
 862
 863         /* Port's PHY and MAC both need to be EEE capable */
 864         if (!dev->phydev || !dp->pl)
 865                 return -ENODEV;
 866
 867         if (!ds->ops->get_mac_eee)
 868                 return -EOPNOTSUPP;
 869
 870         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 871         if (ret)
 872                 return ret;
 873
 874         return phylink_ethtool_get_eee(dp->pl, e);
 875 }
 876
 877 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 878                                         struct ethtool_link_ksettings *cmd)
 879 {
 880         struct dsa_port *dp = dsa_slave_to_port(dev);
 881
 882         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 883 }
 884
 885 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 886                                         const struct ethtool_link_ksettings *cmd)
 887 {
 888         struct dsa_port *dp = dsa_slave_to_port(dev);
 889
 890         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 891 }
 892
 893 static void dsa_slave_get_pauseparam(struct net_device *dev,
 894                                      struct ethtool_pauseparam *pause)
 895 {
 896         struct dsa_port *dp = dsa_slave_to_port(dev);
 897
 898         phylink_ethtool_get_pauseparam(dp->pl, pause);
 899 }
 900
 901 static int dsa_slave_set_pauseparam(struct net_device *dev,
 902                                     struct ethtool_pauseparam *pause)
 903 {
 904         struct dsa_port *dp = dsa_slave_to_port(dev);
 905
 906         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 907 }
 908
 909 #ifdef CONFIG_NET_POLL_CONTROLLER
 910 static int dsa_slave_netpoll_setup(struct net_device *dev,
 911                                    struct netpoll_info *ni)
 912 {
 913         struct net_device *master = dsa_slave_to_master(dev);
 914         struct dsa_slave_priv *p = netdev_priv(dev);
 915         struct netpoll *netpoll;
 916         int err = 0;
 917
 918         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 919         if (!netpoll)
 920                 return -ENOMEM;
 921
 922         err = __netpoll_setup(netpoll, master);
 923         if (err) {
 924                 kfree(netpoll);
 925                 goto out;
 926         }
 927
 928         p->netpoll = netpoll;
 929 out:
 930         return err;
 931 }
 932
 933 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 934 {
 935         struct dsa_slave_priv *p = netdev_priv(dev);
 936         struct netpoll *netpoll = p->netpoll;
 937
 938         if (!netpoll)
 939                 return;
 940
 941         p->netpoll = NULL;
 942
 943         __netpoll_free(netpoll);
 944 }
 945
 946 static void dsa_slave_poll_controller(struct net_device *dev)
 947 {
 948 }
 949 #endif
 950
 951 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 952                                         char *name, size_t len)
 953 {
 954         struct dsa_port *dp = dsa_slave_to_port(dev);
 955
 956         /* For non-legacy ports, devlink is used and it takes
 957          * care of the name generation. This ndo implementation
 958          * should be removed with legacy support.
 959          */
 960         if (dp->ds->devlink)
 961                 return -EOPNOTSUPP;
 962
 963         if (snprintf(name, len, "p%d", dp->index) >= len)
 964                 return -EINVAL;
 965
 966         return 0;
 967 }
 968
 969 static struct dsa_mall_tc_entry *
 970 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 971 {
 972         struct dsa_slave_priv *p = netdev_priv(dev);
 973         struct dsa_mall_tc_entry *mall_tc_entry;
 974
 975         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 976                 if (mall_tc_entry->cookie == cookie)
 977                         return mall_tc_entry;
 978
 979         return NULL;
 980 }
 981
 982 static int
 983 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 984                                   struct tc_cls_matchall_offload *cls,
 985                                   bool ingress)
 986 {
 987         struct dsa_port *dp = dsa_slave_to_port(dev);
 988         struct dsa_slave_priv *p = netdev_priv(dev);
 989         struct dsa_mall_mirror_tc_entry *mirror;
 990         struct dsa_mall_tc_entry *mall_tc_entry;
 991         struct dsa_switch *ds = dp->ds;
 992         struct flow_action_entry *act;
 993         struct dsa_port *to_dp;
 994         int err;
 995
 996         if (!ds->ops->port_mirror_add)
 997                 return -EOPNOTSUPP;
 998
 999         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1000                                               cls->common.extack))
1001                 return -EOPNOTSUPP;
1002
1003         act = &cls->rule->action.entries[0];
1004
1005         if (!act->dev)
1006                 return -EINVAL;
1007
1008         if (!dsa_slave_dev_check(act->dev))
1009                 return -EOPNOTSUPP;
1010
1011         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1012         if (!mall_tc_entry)
1013                 return -ENOMEM;
1014
1015         mall_tc_entry->cookie = cls->cookie;
1016         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1017         mirror = &mall_tc_entry->mirror;
1018
1019         to_dp = dsa_slave_to_port(act->dev);
1020
1021         mirror->to_local_port = to_dp->index;
1022         mirror->ingress = ingress;
1023
1024         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
1025         if (err) {
1026                 kfree(mall_tc_entry);
1027                 return err;
1028         }
1029
1030         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1031
1032         return err;
1033 }
1034
1035 static int
1036 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1037                                   struct tc_cls_matchall_offload *cls,
1038                                   bool ingress)
1039 {
1040         struct netlink_ext_ack *extack = cls->common.extack;
1041         struct dsa_port *dp = dsa_slave_to_port(dev);
1042         struct dsa_slave_priv *p = netdev_priv(dev);
1043         struct dsa_mall_policer_tc_entry *policer;
1044         struct dsa_mall_tc_entry *mall_tc_entry;
1045         struct dsa_switch *ds = dp->ds;
1046         struct flow_action_entry *act;
1047         int err;
1048
1049         if (!ds->ops->port_policer_add) {
1050                 NL_SET_ERR_MSG_MOD(extack,
1051                                    "Policing offload not implemented");
1052                 return -EOPNOTSUPP;
1053         }
1054
1055         if (!ingress) {
1056                 NL_SET_ERR_MSG_MOD(extack,
1057                                    "Only supported on ingress qdisc");
1058                 return -EOPNOTSUPP;
1059         }
1060
1061         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1062                                               cls->common.extack))
1063                 return -EOPNOTSUPP;
1064
1065         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1066                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1067                         NL_SET_ERR_MSG_MOD(extack,
1068                                            "Only one port policer allowed");
1069                         return -EEXIST;
1070                 }
1071         }
1072
1073         act = &cls->rule->action.entries[0];
1074
1075         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1076         if (!mall_tc_entry)
1077                 return -ENOMEM;
1078
1079         mall_tc_entry->cookie = cls->cookie;
1080         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1081         policer = &mall_tc_entry->policer;
1082         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1083         policer->burst = act->police.burst;
1084
1085         err = ds->ops->port_policer_add(ds, dp->index, policer);
1086         if (err) {
1087                 kfree(mall_tc_entry);
1088                 return err;
1089         }
1090
1091         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1092
1093         return err;
1094 }
1095
1096 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1097                                       struct tc_cls_matchall_offload *cls,
1098                                       bool ingress)
1099 {
1100         int err = -EOPNOTSUPP;
1101
1102         if (cls->common.protocol == htons(ETH_P_ALL) &&
1103             flow_offload_has_one_action(&cls->rule->action) &&
1104             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1105                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1106         else if (flow_offload_has_one_action(&cls->rule->action) &&
1107                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1108                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1109
1110         return err;
1111 }
1112
1113 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1114                                        struct tc_cls_matchall_offload *cls)
1115 {
1116         struct dsa_port *dp = dsa_slave_to_port(dev);
1117         struct dsa_mall_tc_entry *mall_tc_entry;
1118         struct dsa_switch *ds = dp->ds;
1119
1120         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1121         if (!mall_tc_entry)
1122                 return;
1123
1124         list_del(&mall_tc_entry->list);
1125
1126         switch (mall_tc_entry->type) {
1127         case DSA_PORT_MALL_MIRROR:
1128                 if (ds->ops->port_mirror_del)
1129                         ds->ops->port_mirror_del(ds, dp->index,
1130                                                  &mall_tc_entry->mirror);
1131                 break;
1132         case DSA_PORT_MALL_POLICER:
1133                 if (ds->ops->port_policer_del)
1134                         ds->ops->port_policer_del(ds, dp->index);
1135                 break;
1136         default:
1137                 WARN_ON(1);
1138         }
1139
1140         kfree(mall_tc_entry);
1141 }
1142
1143 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1144                                            struct tc_cls_matchall_offload *cls,
1145                                            bool ingress)
1146 {
1147         if (cls->common.chain_index)
1148                 return -EOPNOTSUPP;
1149
1150         switch (cls->command) {
1151         case TC_CLSMATCHALL_REPLACE:
1152                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1153         case TC_CLSMATCHALL_DESTROY:
1154                 dsa_slave_del_cls_matchall(dev, cls);
1155                 return 0;
1156         default:
1157                 return -EOPNOTSUPP;
1158         }
1159 }
1160
1161 static int dsa_slave_add_cls_flower(struct net_device *dev,
1162                                     struct flow_cls_offload *cls,
1163                                     bool ingress)
1164 {
1165         struct dsa_port *dp = dsa_slave_to_port(dev);
1166         struct dsa_switch *ds = dp->ds;
1167         int port = dp->index;
1168
1169         if (!ds->ops->cls_flower_add)
1170                 return -EOPNOTSUPP;
1171
1172         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1173 }
1174
1175 static int dsa_slave_del_cls_flower(struct net_device *dev,
1176                                     struct flow_cls_offload *cls,
1177                                     bool ingress)
1178 {
1179         struct dsa_port *dp = dsa_slave_to_port(dev);
1180         struct dsa_switch *ds = dp->ds;
1181         int port = dp->index;
1182
1183         if (!ds->ops->cls_flower_del)
1184                 return -EOPNOTSUPP;
1185
1186         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1187 }
1188
1189 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1190                                       struct flow_cls_offload *cls,
1191                                       bool ingress)
1192 {
1193         struct dsa_port *dp = dsa_slave_to_port(dev);
1194         struct dsa_switch *ds = dp->ds;
1195         int port = dp->index;
1196
1197         if (!ds->ops->cls_flower_stats)
1198                 return -EOPNOTSUPP;
1199
1200         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1201 }
1202
1203 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1204                                          struct flow_cls_offload *cls,
1205                                          bool ingress)
1206 {
1207         switch (cls->command) {
1208         case FLOW_CLS_REPLACE:
1209                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1210         case FLOW_CLS_DESTROY:
1211                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1212         case FLOW_CLS_STATS:
1213                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1214         default:
1215                 return -EOPNOTSUPP;
1216         }
1217 }
1218
1219 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1220                                        void *cb_priv, bool ingress)
1221 {
1222         struct net_device *dev = cb_priv;
1223
1224         if (!tc_can_offload(dev))
1225                 return -EOPNOTSUPP;
1226
1227         switch (type) {
1228         case TC_SETUP_CLSMATCHALL:
1229                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1230         case TC_SETUP_CLSFLOWER:
1231                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1232         default:
1233                 return -EOPNOTSUPP;
1234         }
1235 }
1236
1237 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1238                                           void *type_data, void *cb_priv)
1239 {
1240         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1241 }
1242
1243 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1244                                           void *type_data, void *cb_priv)
1245 {
1246         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1247 }
1248
1249 static LIST_HEAD(dsa_slave_block_cb_list);
1250
1251 static int dsa_slave_setup_tc_block(struct net_device *dev,
1252                                     struct flow_block_offload *f)
1253 {
1254         struct flow_block_cb *block_cb;
1255         flow_setup_cb_t *cb;
1256
1257         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1258                 cb = dsa_slave_setup_tc_block_cb_ig;
1259         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1260                 cb = dsa_slave_setup_tc_block_cb_eg;
1261         else
1262                 return -EOPNOTSUPP;
1263
1264         f->driver_block_list = &dsa_slave_block_cb_list;
1265
1266         switch (f->command) {
1267         case FLOW_BLOCK_BIND:
1268                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1269                         return -EBUSY;
1270
1271                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1272                 if (IS_ERR(block_cb))
1273                         return PTR_ERR(block_cb);
1274
1275                 flow_block_cb_add(block_cb, f);
1276                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1277                 return 0;
1278         case FLOW_BLOCK_UNBIND:
1279                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1280                 if (!block_cb)
1281                         return -ENOENT;
1282
1283                 flow_block_cb_remove(block_cb, f);
1284                 list_del(&block_cb->driver_list);
1285                 return 0;
1286         default:
1287                 return -EOPNOTSUPP;
1288         }
1289 }
1290
1291 static int dsa_slave_setup_ft_block(struct dsa_switch *ds, int port,
1292                                     void *type_data)
1293 {
1294         struct dsa_port *cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1295         struct net_device *master = cpu_dp->master;
1296
1297         if (!master->netdev_ops->ndo_setup_tc)
1298                 return -EOPNOTSUPP;
1299
1300         return master->netdev_ops->ndo_setup_tc(master, TC_SETUP_FT, type_data);
1301 }
1302
1303 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1304                               void *type_data)
1305 {
1306         struct dsa_port *dp = dsa_slave_to_port(dev);
1307         struct dsa_switch *ds = dp->ds;
1308
1309         switch (type) {
1310         case TC_SETUP_BLOCK:
1311                 return dsa_slave_setup_tc_block(dev, type_data);
1312         case TC_SETUP_FT:
1313                 return dsa_slave_setup_ft_block(ds, dp->index, type_data);
1314         default:
1315                 break;
1316         }
1317
1318         if (!ds->ops->port_setup_tc)
1319                 return -EOPNOTSUPP;
1320
1321         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1322 }
1323
1324 static int dsa_slave_get_rxnfc(struct net_device *dev,
1325                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1326 {
1327         struct dsa_port *dp = dsa_slave_to_port(dev);
1328         struct dsa_switch *ds = dp->ds;
1329
1330         if (!ds->ops->get_rxnfc)
1331                 return -EOPNOTSUPP;
1332
1333         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1334 }
1335
1336 static int dsa_slave_set_rxnfc(struct net_device *dev,
1337                                struct ethtool_rxnfc *nfc)
1338 {
1339         struct dsa_port *dp = dsa_slave_to_port(dev);
1340         struct dsa_switch *ds = dp->ds;
1341
1342         if (!ds->ops->set_rxnfc)
1343                 return -EOPNOTSUPP;
1344
1345         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1346 }
1347
1348 static int dsa_slave_get_ts_info(struct net_device *dev,
1349                                  struct ethtool_ts_info *ts)
1350 {
1351         struct dsa_slave_priv *p = netdev_priv(dev);
1352         struct dsa_switch *ds = p->dp->ds;
1353
1354         if (!ds->ops->get_ts_info)
1355                 return -EOPNOTSUPP;
1356
1357         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1358 }
1359
1360 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1361                                      u16 vid)
1362 {
1363         struct net_device *master = dsa_slave_to_master(dev);
1364         struct dsa_port *dp = dsa_slave_to_port(dev);
1365         struct switchdev_obj_port_vlan vlan = {
1366                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1367                 .vid = vid,
1368                 /* This API only allows programming tagged, non-PVID VIDs */
1369                 .flags = 0,
1370         };
1371         struct netlink_ext_ack extack = {0};
1372         int ret;
1373
1374         /* User port... */
1375         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1376         if (ret) {
1377                 if (extack._msg)
1378                         netdev_err(dev, "%s\n", extack._msg);
1379                 return ret;
1380         }
1381
1382         /* And CPU port... */
1383         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &extack);
1384         if (ret) {
1385                 if (extack._msg)
1386                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1387                                    extack._msg);
1388                 return ret;
1389         }
1390
1391         return vlan_vid_add(master, proto, vid);
1392 }
1393
1394 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1395                                       u16 vid)
1396 {
1397         struct net_device *master = dsa_slave_to_master(dev);
1398         struct dsa_port *dp = dsa_slave_to_port(dev);
1399         struct switchdev_obj_port_vlan vlan = {
1400                 .vid = vid,
1401                 /* This API only allows programming tagged, non-PVID VIDs */
1402                 .flags = 0,
1403         };
1404         int err;
1405
1406         /* Do not deprogram the CPU port as it may be shared with other user
1407          * ports which can be members of this VLAN as well.
1408          */
1409         err = dsa_port_vlan_del(dp, &vlan);
1410         if (err)
1411                 return err;
1412
1413         vlan_vid_del(master, proto, vid);
1414
1415         return 0;
1416 }
1417
1418 struct dsa_hw_port {
1419         struct list_head list;
1420         struct net_device *dev;
1421         int old_mtu;
1422 };
1423
1424 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1425 {
1426         const struct dsa_hw_port *p;
1427         int err;
1428
1429         list_for_each_entry(p, hw_port_list, list) {
1430                 if (p->dev->mtu == mtu)
1431                         continue;
1432
1433                 err = dev_set_mtu(p->dev, mtu);
1434                 if (err)
1435                         goto rollback;
1436         }
1437
1438         return 0;
1439
1440 rollback:
1441         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1442                 if (p->dev->mtu == p->old_mtu)
1443                         continue;
1444
1445                 if (dev_set_mtu(p->dev, p->old_mtu))
1446                         netdev_err(p->dev, "Failed to restore MTU\n");
1447         }
1448
1449         return err;
1450 }
1451
1452 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1453 {
1454         struct dsa_hw_port *p, *n;
1455
1456         list_for_each_entry_safe(p, n, hw_port_list, list)
1457                 kfree(p);
1458 }
1459
1460 /* Make the hardware datapath to/from @dev limited to a common MTU */
1461 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1462 {
1463         struct list_head hw_port_list;
1464         struct dsa_switch_tree *dst;
1465         int min_mtu = ETH_MAX_MTU;
1466         struct dsa_port *other_dp;
1467         int err;
1468
1469         if (!dp->ds->mtu_enforcement_ingress)
1470                 return;
1471
1472         if (!dp->bridge_dev)
1473                 return;
1474
1475         INIT_LIST_HEAD(&hw_port_list);
1476
1477         /* Populate the list of ports that are part of the same bridge
1478          * as the newly added/modified port
1479          */
1480         list_for_each_entry(dst, &dsa_tree_list, list) {
1481                 list_for_each_entry(other_dp, &dst->ports, list) {
1482                         struct dsa_hw_port *hw_port;
1483                         struct net_device *slave;
1484
1485                         if (other_dp->type != DSA_PORT_TYPE_USER)
1486                                 continue;
1487
1488                         if (other_dp->bridge_dev != dp->bridge_dev)
1489                                 continue;
1490
1491                         if (!other_dp->ds->mtu_enforcement_ingress)
1492                                 continue;
1493
1494                         slave = other_dp->slave;
1495
1496                         if (min_mtu > slave->mtu)
1497                                 min_mtu = slave->mtu;
1498
1499                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1500                         if (!hw_port)
1501                                 goto out;
1502
1503                         hw_port->dev = slave;
1504                         hw_port->old_mtu = slave->mtu;
1505
1506                         list_add(&hw_port->list, &hw_port_list);
1507                 }
1508         }
1509
1510         /* Attempt to configure the entire hardware bridge to the newly added
1511          * interface's MTU first, regardless of whether the intention of the
1512          * user was to raise or lower it.
1513          */
1514         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1515         if (!err)
1516                 goto out;
1517
1518         /* Clearly that didn't work out so well, so just set the minimum MTU on
1519          * all hardware bridge ports now. If this fails too, then all ports will
1520          * still have their old MTU rolled back anyway.
1521          */
1522         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1523
1524 out:
1525         dsa_hw_port_list_free(&hw_port_list);
1526 }
1527
1528 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1529 {
1530         struct net_device *master = dsa_slave_to_master(dev);
1531         struct dsa_port *dp = dsa_slave_to_port(dev);
1532         struct dsa_slave_priv *p = netdev_priv(dev);
1533         struct dsa_switch *ds = p->dp->ds;
1534         struct dsa_port *dp_iter;
1535         struct dsa_port *cpu_dp;
1536         int port = p->dp->index;
1537         int largest_mtu = 0;
1538         int new_master_mtu;
1539         int old_master_mtu;
1540         int mtu_limit;
1541         int cpu_mtu;
1542         int err;
1543
1544         if (!ds->ops->port_change_mtu)
1545                 return -EOPNOTSUPP;
1546
1547         list_for_each_entry(dp_iter, &ds->dst->ports, list) {
1548                 int slave_mtu;
1549
1550                 if (!dsa_port_is_user(dp_iter))
1551                         continue;
1552
1553                 /* During probe, this function will be called for each slave
1554                  * device, while not all of them have been allocated. That's
1555                  * ok, it doesn't change what the maximum is, so ignore it.
1556                  */
1557                 if (!dp_iter->slave)
1558                         continue;
1559
1560                 /* Pretend that we already applied the setting, which we
1561                  * actually haven't (still haven't done all integrity checks)
1562                  */
1563                 if (dp_iter == dp)
1564                         slave_mtu = new_mtu;
1565                 else
1566                         slave_mtu = dp_iter->slave->mtu;
1567
1568                 if (largest_mtu < slave_mtu)
1569                         largest_mtu = slave_mtu;
1570         }
1571
1572         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1573
1574         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1575         old_master_mtu = master->mtu;
1576         new_master_mtu = largest_mtu + dsa_tag_protocol_overhead(cpu_dp->tag_ops);
1577         if (new_master_mtu > mtu_limit)
1578                 return -ERANGE;
1579
1580         /* If the master MTU isn't over limit, there's no need to check the CPU
1581          * MTU, since that surely isn't either.
1582          */
1583         cpu_mtu = largest_mtu;
1584
1585         /* Start applying stuff */
1586         if (new_master_mtu != old_master_mtu) {
1587                 err = dev_set_mtu(master, new_master_mtu);
1588                 if (err < 0)
1589                         goto out_master_failed;
1590
1591                 /* We only need to propagate the MTU of the CPU port to
1592                  * upstream switches, so create a non-targeted notifier which
1593                  * updates all switches.
1594                  */
1595                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, false);
1596                 if (err)
1597                         goto out_cpu_failed;
1598         }
1599
1600         err = dsa_port_mtu_change(dp, new_mtu, true);
1601         if (err)
1602                 goto out_port_failed;
1603
1604         dev->mtu = new_mtu;
1605
1606         dsa_bridge_mtu_normalization(dp);
1607
1608         return 0;
1609
1610 out_port_failed:
1611         if (new_master_mtu != old_master_mtu)
1612                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1613                                     dsa_tag_protocol_overhead(cpu_dp->tag_ops),
1614                                     false);
1615 out_cpu_failed:
1616         if (new_master_mtu != old_master_mtu)
1617                 dev_set_mtu(master, old_master_mtu);
1618 out_master_failed:
1619         return err;
1620 }
1621
1622 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1623         .get_drvinfo            = dsa_slave_get_drvinfo,
1624         .get_regs_len           = dsa_slave_get_regs_len,
1625         .get_regs               = dsa_slave_get_regs,
1626         .nway_reset             = dsa_slave_nway_reset,
1627         .get_link               = ethtool_op_get_link,
1628         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1629         .get_eeprom             = dsa_slave_get_eeprom,
1630         .set_eeprom             = dsa_slave_set_eeprom,
1631         .get_strings            = dsa_slave_get_strings,
1632         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1633         .get_sset_count         = dsa_slave_get_sset_count,
1634         .set_wol                = dsa_slave_set_wol,
1635         .get_wol                = dsa_slave_get_wol,
1636         .set_eee                = dsa_slave_set_eee,
1637         .get_eee                = dsa_slave_get_eee,
1638         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1639         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1640         .get_pauseparam         = dsa_slave_get_pauseparam,
1641         .set_pauseparam         = dsa_slave_set_pauseparam,
1642         .get_rxnfc              = dsa_slave_get_rxnfc,
1643         .set_rxnfc              = dsa_slave_set_rxnfc,
1644         .get_ts_info            = dsa_slave_get_ts_info,
1645         .self_test              = dsa_slave_net_selftest,
1646 };
1647
1648 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1649 {
1650         struct dsa_port *dp = dsa_slave_to_port(dev);
1651
1652         return dp->ds->devlink ? &dp->devlink_port : NULL;
1653 }
1654
1655 static void dsa_slave_get_stats64(struct net_device *dev,
1656                                   struct rtnl_link_stats64 *s)
1657 {
1658         struct dsa_port *dp = dsa_slave_to_port(dev);
1659         struct dsa_switch *ds = dp->ds;
1660
1661         if (ds->ops->get_stats64)
1662                 ds->ops->get_stats64(ds, dp->index, s);
1663         else
1664                 dev_get_tstats64(dev, s);
1665 }
1666
1667 static int dsa_slave_fill_forward_path(struct net_device_path_ctx *ctx,
1668                                        struct net_device_path *path)
1669 {
1670         struct dsa_port *dp = dsa_slave_to_port(ctx->dev);
1671         struct dsa_port *cpu_dp = dp->cpu_dp;
1672
1673         path->dev = ctx->dev;
1674         path->type = DEV_PATH_DSA;
1675         path->dsa.proto = cpu_dp->tag_ops->proto;
1676         path->dsa.port = dp->index;
1677         ctx->dev = cpu_dp->master;
1678
1679         return 0;
1680 }
1681
1682 static const struct net_device_ops dsa_slave_netdev_ops = {
1683         .ndo_open               = dsa_slave_open,
1684         .ndo_stop               = dsa_slave_close,
1685         .ndo_start_xmit         = dsa_slave_xmit,
1686         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1687         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1688         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1689         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1690         .ndo_do_ioctl           = dsa_slave_ioctl,
1691         .ndo_get_iflink         = dsa_slave_get_iflink,
1692 #ifdef CONFIG_NET_POLL_CONTROLLER
1693         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1694         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1695         .ndo_poll_controller    = dsa_slave_poll_controller,
1696 #endif
1697         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1698         .ndo_setup_tc           = dsa_slave_setup_tc,
1699         .ndo_get_stats64        = dsa_slave_get_stats64,
1700         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1701         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1702         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1703         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1704         .ndo_change_mtu         = dsa_slave_change_mtu,
1705         .ndo_fill_forward_path  = dsa_slave_fill_forward_path,
1706 };
1707
1708 static struct device_type dsa_type = {
1709         .name   = "dsa",
1710 };
1711
1712 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1713 {
1714         const struct dsa_port *dp = dsa_to_port(ds, port);
1715
1716         if (dp->pl)
1717                 phylink_mac_change(dp->pl, up);
1718 }
1719 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1720
1721 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1722                                           struct phylink_link_state *state)
1723 {
1724         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1725         struct dsa_switch *ds = dp->ds;
1726
1727         /* No need to check that this operation is valid, the callback would
1728          * not be called if it was not.
1729          */
1730         ds->ops->phylink_fixed_state(ds, dp->index, state);
1731 }
1732
1733 /* slave device setup *******************************************************/
1734 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr,
1735                                  u32 flags)
1736 {
1737         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1738         struct dsa_switch *ds = dp->ds;
1739
1740         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1741         if (!slave_dev->phydev) {
1742                 netdev_err(slave_dev, "no phy at %d\n", addr);
1743                 return -ENODEV;
1744         }
1745
1746         slave_dev->phydev->dev_flags |= flags;
1747
1748         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1749 }
1750
1751 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1752 {
1753         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1754         struct device_node *port_dn = dp->dn;
1755         struct dsa_switch *ds = dp->ds;
1756         phy_interface_t mode;
1757         u32 phy_flags = 0;
1758         int ret;
1759
1760         ret = of_get_phy_mode(port_dn, &mode);
1761         if (ret)
1762                 mode = PHY_INTERFACE_MODE_NA;
1763
1764         dp->pl_config.dev = &slave_dev->dev;
1765         dp->pl_config.type = PHYLINK_NETDEV;
1766
1767         /* The get_fixed_state callback takes precedence over polling the
1768          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1769          * this if the switch provides such a callback.
1770          */
1771         if (ds->ops->phylink_fixed_state) {
1772                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1773                 dp->pl_config.poll_fixed_state = true;
1774         }
1775
1776         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1777                                 &dsa_port_phylink_mac_ops);
1778         if (IS_ERR(dp->pl)) {
1779                 netdev_err(slave_dev,
1780                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1781                 return PTR_ERR(dp->pl);
1782         }
1783
1784         if (ds->ops->get_phy_flags)
1785                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1786
1787         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1788         if (ret == -ENODEV && ds->slave_mii_bus) {
1789                 /* We could not connect to a designated PHY or SFP, so try to
1790                  * use the switch internal MDIO bus instead
1791                  */
1792                 ret = dsa_slave_phy_connect(slave_dev, dp->index, phy_flags);
1793                 if (ret) {
1794                         netdev_err(slave_dev,
1795                                    "failed to connect to port %d: %d\n",
1796                                    dp->index, ret);
1797                         phylink_destroy(dp->pl);
1798                         return ret;
1799                 }
1800         }
1801
1802         return ret;
1803 }
1804
1805 void dsa_slave_setup_tagger(struct net_device *slave)
1806 {
1807         struct dsa_port *dp = dsa_slave_to_port(slave);
1808         struct dsa_slave_priv *p = netdev_priv(slave);
1809         const struct dsa_port *cpu_dp = dp->cpu_dp;
1810         struct net_device *master = cpu_dp->master;
1811
1812         slave->needed_headroom = cpu_dp->tag_ops->needed_headroom;
1813         slave->needed_tailroom = cpu_dp->tag_ops->needed_tailroom;
1814         /* Try to save one extra realloc later in the TX path (in the master)
1815          * by also inheriting the master's needed headroom and tailroom.
1816          * The 8021q driver also does this.
1817          */
1818         slave->needed_headroom += master->needed_headroom;
1819         slave->needed_tailroom += master->needed_tailroom;
1820
1821         p->xmit = cpu_dp->tag_ops->xmit;
1822 }
1823
1824 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1825 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1826                                             struct netdev_queue *txq,
1827                                             void *_unused)
1828 {
1829         lockdep_set_class(&txq->_xmit_lock,
1830                           &dsa_slave_netdev_xmit_lock_key);
1831 }
1832
1833 int dsa_slave_suspend(struct net_device *slave_dev)
1834 {
1835         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1836
1837         if (!netif_running(slave_dev))
1838                 return 0;
1839
1840         netif_device_detach(slave_dev);
1841
1842         rtnl_lock();
1843         phylink_stop(dp->pl);
1844         rtnl_unlock();
1845
1846         return 0;
1847 }
1848
1849 int dsa_slave_resume(struct net_device *slave_dev)
1850 {
1851         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1852
1853         if (!netif_running(slave_dev))
1854                 return 0;
1855
1856         netif_device_attach(slave_dev);
1857
1858         rtnl_lock();
1859         phylink_start(dp->pl);
1860         rtnl_unlock();
1861
1862         return 0;
1863 }
1864
1865 int dsa_slave_create(struct dsa_port *port)
1866 {
1867         const struct dsa_port *cpu_dp = port->cpu_dp;
1868         struct net_device *master = cpu_dp->master;
1869         struct dsa_switch *ds = port->ds;
1870         const char *name = port->name;
1871         struct net_device *slave_dev;
1872         struct dsa_slave_priv *p;
1873         int ret;
1874
1875         if (!ds->num_tx_queues)
1876                 ds->num_tx_queues = 1;
1877
1878         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1879                                      NET_NAME_UNKNOWN, ether_setup,
1880                                      ds->num_tx_queues, 1);
1881         if (slave_dev == NULL)
1882                 return -ENOMEM;
1883
1884         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1885         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1886                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1887         slave_dev->hw_features |= NETIF_F_HW_TC;
1888         slave_dev->features |= NETIF_F_LLTX;
1889         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1890         if (!is_zero_ether_addr(port->mac))
1891                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1892         else
1893                 eth_hw_addr_inherit(slave_dev, master);
1894         slave_dev->priv_flags |= IFF_NO_QUEUE;
1895         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1896         if (ds->ops->port_max_mtu)
1897                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1898         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1899
1900         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1901                                  NULL);
1902
1903         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1904         slave_dev->dev.of_node = port->dn;
1905         slave_dev->vlan_features = master->vlan_features;
1906
1907         p = netdev_priv(slave_dev);
1908         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1909         if (!slave_dev->tstats) {
1910                 free_netdev(slave_dev);
1911                 return -ENOMEM;
1912         }
1913
1914         ret = gro_cells_init(&p->gcells, slave_dev);
1915         if (ret)
1916                 goto out_free;
1917
1918         p->dp = port;
1919         INIT_LIST_HEAD(&p->mall_tc_list);
1920         port->slave = slave_dev;
1921         dsa_slave_setup_tagger(slave_dev);
1922
1923         rtnl_lock();
1924         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1925         rtnl_unlock();
1926         if (ret && ret != -EOPNOTSUPP)
1927                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1928                          ret, ETH_DATA_LEN, port->index);
1929
1930         netif_carrier_off(slave_dev);
1931
1932         ret = dsa_slave_phy_setup(slave_dev);
1933         if (ret) {
1934                 netdev_err(slave_dev,
1935                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1936                            ret, ds->dst->index, ds->index, port->index);
1937                 goto out_gcells;
1938         }
1939
1940         rtnl_lock();
1941
1942         ret = register_netdevice(slave_dev);
1943         if (ret) {
1944                 netdev_err(master, "error %d registering interface %s\n",
1945                            ret, slave_dev->name);
1946                 rtnl_unlock();
1947                 goto out_phy;
1948         }
1949
1950         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1951
1952         rtnl_unlock();
1953
1954         if (ret)
1955                 goto out_unregister;
1956
1957         return 0;
1958
1959 out_unregister:
1960         unregister_netdev(slave_dev);
1961 out_phy:
1962         rtnl_lock();
1963         phylink_disconnect_phy(p->dp->pl);
1964         rtnl_unlock();
1965         phylink_destroy(p->dp->pl);
1966 out_gcells:
1967         gro_cells_destroy(&p->gcells);
1968 out_free:
1969         free_percpu(slave_dev->tstats);
1970         free_netdev(slave_dev);
1971         port->slave = NULL;
1972         return ret;
1973 }
1974
1975 void dsa_slave_destroy(struct net_device *slave_dev)
1976 {
1977         struct net_device *master = dsa_slave_to_master(slave_dev);
1978         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1979         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1980
1981         netif_carrier_off(slave_dev);
1982         rtnl_lock();
1983         netdev_upper_dev_unlink(master, slave_dev);
1984         unregister_netdevice(slave_dev);
1985         phylink_disconnect_phy(dp->pl);
1986         rtnl_unlock();
1987
1988         phylink_destroy(dp->pl);
1989         gro_cells_destroy(&p->gcells);
1990         free_percpu(slave_dev->tstats);
1991         free_netdev(slave_dev);
1992 }
1993
1994 bool dsa_slave_dev_check(const struct net_device *dev)
1995 {
1996         return dev->netdev_ops == &dsa_slave_netdev_ops;
1997 }
1998 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
1999
2000 static int dsa_slave_changeupper(struct net_device *dev,
2001                                  struct netdev_notifier_changeupper_info *info)
2002 {
2003         struct dsa_port *dp = dsa_slave_to_port(dev);
2004         struct netlink_ext_ack *extack;
2005         int err = NOTIFY_DONE;
2006
2007         extack = netdev_notifier_info_to_extack(&info->info);
2008
2009         if (netif_is_bridge_master(info->upper_dev)) {
2010                 if (info->linking) {
2011                         err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2012                         if (!err)
2013                                 dsa_bridge_mtu_normalization(dp);
2014                         err = notifier_from_errno(err);
2015                 } else {
2016                         dsa_port_bridge_leave(dp, info->upper_dev);
2017                         err = NOTIFY_OK;
2018                 }
2019         } else if (netif_is_lag_master(info->upper_dev)) {
2020                 if (info->linking) {
2021                         err = dsa_port_lag_join(dp, info->upper_dev,
2022                                                 info->upper_info, extack);
2023                         if (err == -EOPNOTSUPP) {
2024                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2025                                                    "Offloading not supported");
2026                                 err = 0;
2027                         }
2028                         err = notifier_from_errno(err);
2029                 } else {
2030                         dsa_port_lag_leave(dp, info->upper_dev);
2031                         err = NOTIFY_OK;
2032                 }
2033         } else if (is_hsr_master(info->upper_dev)) {
2034                 if (info->linking) {
2035                         err = dsa_port_hsr_join(dp, info->upper_dev);
2036                         if (err == -EOPNOTSUPP) {
2037                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2038                                                    "Offloading not supported");
2039                                 err = 0;
2040                         }
2041                         err = notifier_from_errno(err);
2042                 } else {
2043                         dsa_port_hsr_leave(dp, info->upper_dev);
2044                         err = NOTIFY_OK;
2045                 }
2046         }
2047
2048         return err;
2049 }
2050
2051 static int dsa_slave_prechangeupper(struct net_device *dev,
2052                                     struct netdev_notifier_changeupper_info *info)
2053 {
2054         struct dsa_port *dp = dsa_slave_to_port(dev);
2055         struct netlink_ext_ack *extack;
2056         int err = 0;
2057
2058         extack = netdev_notifier_info_to_extack(&info->info);
2059
2060         if (netif_is_bridge_master(info->upper_dev) && !info->linking)
2061                 err = dsa_port_pre_bridge_leave(dp, info->upper_dev, extack);
2062         else if (netif_is_lag_master(info->upper_dev) && !info->linking)
2063                 err = dsa_port_pre_lag_leave(dp, info->upper_dev, extack);
2064         /* dsa_port_pre_hsr_leave is not yet necessary since hsr cannot be
2065          * meaningfully enslaved to a bridge yet
2066          */
2067
2068         return notifier_from_errno(err);
2069 }
2070
2071 static int
2072 dsa_slave_lag_changeupper(struct net_device *dev,
2073                           struct netdev_notifier_changeupper_info *info)
2074 {
2075         struct net_device *lower;
2076         struct list_head *iter;
2077         int err = NOTIFY_DONE;
2078         struct dsa_port *dp;
2079
2080         netdev_for_each_lower_dev(dev, lower, iter) {
2081                 if (!dsa_slave_dev_check(lower))
2082                         continue;
2083
2084                 dp = dsa_slave_to_port(lower);
2085                 if (!dp->lag_dev)
2086                         /* Software LAG */
2087                         continue;
2088
2089                 err = dsa_slave_changeupper(lower, info);
2090                 if (notifier_to_errno(err))
2091                         break;
2092         }
2093
2094         return err;
2095 }
2096
2097 /* Same as dsa_slave_lag_changeupper() except that it calls
2098  * dsa_slave_prechangeupper()
2099  */
2100 static int
2101 dsa_slave_lag_prechangeupper(struct net_device *dev,
2102                              struct netdev_notifier_changeupper_info *info)
2103 {
2104         struct net_device *lower;
2105         struct list_head *iter;
2106         int err = NOTIFY_DONE;
2107         struct dsa_port *dp;
2108
2109         netdev_for_each_lower_dev(dev, lower, iter) {
2110                 if (!dsa_slave_dev_check(lower))
2111                         continue;
2112
2113                 dp = dsa_slave_to_port(lower);
2114                 if (!dp->lag_dev)
2115                         /* Software LAG */
2116                         continue;
2117
2118                 err = dsa_slave_prechangeupper(lower, info);
2119                 if (notifier_to_errno(err))
2120                         break;
2121         }
2122
2123         return err;
2124 }
2125
2126 static int
2127 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2128                                  struct netdev_notifier_changeupper_info *info)
2129 {
2130         struct netlink_ext_ack *ext_ack;
2131         struct net_device *slave;
2132         struct dsa_port *dp;
2133
2134         ext_ack = netdev_notifier_info_to_extack(&info->info);
2135
2136         if (!is_vlan_dev(dev))
2137                 return NOTIFY_DONE;
2138
2139         slave = vlan_dev_real_dev(dev);
2140         if (!dsa_slave_dev_check(slave))
2141                 return NOTIFY_DONE;
2142
2143         dp = dsa_slave_to_port(slave);
2144         if (!dp->bridge_dev)
2145                 return NOTIFY_DONE;
2146
2147         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2148         if (br_vlan_enabled(dp->bridge_dev) &&
2149             netif_is_bridge_master(info->upper_dev) && info->linking) {
2150                 NL_SET_ERR_MSG_MOD(ext_ack,
2151                                    "Cannot enslave VLAN device into VLAN aware bridge");
2152                 return notifier_from_errno(-EINVAL);
2153         }
2154
2155         return NOTIFY_DONE;
2156 }
2157
2158 static int
2159 dsa_slave_check_8021q_upper(struct net_device *dev,
2160                             struct netdev_notifier_changeupper_info *info)
2161 {
2162         struct dsa_port *dp = dsa_slave_to_port(dev);
2163         struct net_device *br = dp->bridge_dev;
2164         struct bridge_vlan_info br_info;
2165         struct netlink_ext_ack *extack;
2166         int err = NOTIFY_DONE;
2167         u16 vid;
2168
2169         if (!br || !br_vlan_enabled(br))
2170                 return NOTIFY_DONE;
2171
2172         extack = netdev_notifier_info_to_extack(&info->info);
2173         vid = vlan_dev_vlan_id(info->upper_dev);
2174
2175         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2176          * device, respectively the VID is not found, returning
2177          * 0 means success, which is a failure for us here.
2178          */
2179         err = br_vlan_get_info(br, vid, &br_info);
2180         if (err == 0) {
2181                 NL_SET_ERR_MSG_MOD(extack,
2182                                    "This VLAN is already configured by the bridge");
2183                 return notifier_from_errno(-EBUSY);
2184         }
2185
2186         return NOTIFY_DONE;
2187 }
2188
2189 static int
2190 dsa_slave_prechangeupper_sanity_check(struct net_device *dev,
2191                                       struct netdev_notifier_changeupper_info *info)
2192 {
2193         struct dsa_switch *ds;
2194         struct dsa_port *dp;
2195         int err;
2196
2197         if (!dsa_slave_dev_check(dev))
2198                 return dsa_prevent_bridging_8021q_upper(dev, info);
2199
2200         dp = dsa_slave_to_port(dev);
2201         ds = dp->ds;
2202
2203         if (ds->ops->port_prechangeupper) {
2204                 err = ds->ops->port_prechangeupper(ds, dp->index, info);
2205                 if (err)
2206                         return notifier_from_errno(err);
2207         }
2208
2209         if (is_vlan_dev(info->upper_dev))
2210                 return dsa_slave_check_8021q_upper(dev, info);
2211
2212         return NOTIFY_DONE;
2213 }
2214
2215 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2216                                      unsigned long event, void *ptr)
2217 {
2218         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2219
2220         switch (event) {
2221         case NETDEV_PRECHANGEUPPER: {
2222                 struct netdev_notifier_changeupper_info *info = ptr;
2223                 int err;
2224
2225                 err = dsa_slave_prechangeupper_sanity_check(dev, info);
2226                 if (err != NOTIFY_DONE)
2227                         return err;
2228
2229                 if (dsa_slave_dev_check(dev))
2230                         return dsa_slave_prechangeupper(dev, ptr);
2231
2232                 if (netif_is_lag_master(dev))
2233                         return dsa_slave_lag_prechangeupper(dev, ptr);
2234
2235                 break;
2236         }
2237         case NETDEV_CHANGEUPPER:
2238                 if (dsa_slave_dev_check(dev))
2239                         return dsa_slave_changeupper(dev, ptr);
2240
2241                 if (netif_is_lag_master(dev))
2242                         return dsa_slave_lag_changeupper(dev, ptr);
2243
2244                 break;
2245         case NETDEV_CHANGELOWERSTATE: {
2246                 struct netdev_notifier_changelowerstate_info *info = ptr;
2247                 struct dsa_port *dp;
2248                 int err;
2249
2250                 if (!dsa_slave_dev_check(dev))
2251                         break;
2252
2253                 dp = dsa_slave_to_port(dev);
2254
2255                 err = dsa_port_lag_change(dp, info->lower_state_info);
2256                 return notifier_from_errno(err);
2257         }
2258         case NETDEV_GOING_DOWN: {
2259                 struct dsa_port *dp, *cpu_dp;
2260                 struct dsa_switch_tree *dst;
2261                 LIST_HEAD(close_list);
2262
2263                 if (!netdev_uses_dsa(dev))
2264                         return NOTIFY_DONE;
2265
2266                 cpu_dp = dev->dsa_ptr;
2267                 dst = cpu_dp->ds->dst;
2268
2269                 list_for_each_entry(dp, &dst->ports, list) {
2270                         if (!dsa_is_user_port(dp->ds, dp->index))
2271                                 continue;
2272
2273                         list_add(&dp->slave->close_list, &close_list);
2274                 }
2275
2276                 dev_close_many(&close_list, true);
2277
2278                 return NOTIFY_OK;
2279         }
2280         default:
2281                 break;
2282         }
2283
2284         return NOTIFY_DONE;
2285 }
2286
2287 static void
2288 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2289 {
2290         struct dsa_switch *ds = switchdev_work->ds;
2291         struct switchdev_notifier_fdb_info info;
2292         struct dsa_port *dp;
2293
2294         if (!dsa_is_user_port(ds, switchdev_work->port))
2295                 return;
2296
2297         info.addr = switchdev_work->addr;
2298         info.vid = switchdev_work->vid;
2299         info.offloaded = true;
2300         dp = dsa_to_port(ds, switchdev_work->port);
2301         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2302                                  dp->slave, &info.info, NULL);
2303 }
2304
2305 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2306 {
2307         struct dsa_switchdev_event_work *switchdev_work =
2308                 container_of(work, struct dsa_switchdev_event_work, work);
2309         struct dsa_switch *ds = switchdev_work->ds;
2310         struct dsa_port *dp;
2311         int err;
2312
2313         dp = dsa_to_port(ds, switchdev_work->port);
2314
2315         rtnl_lock();
2316         switch (switchdev_work->event) {
2317         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2318                 if (switchdev_work->host_addr)
2319                         err = dsa_port_host_fdb_add(dp, switchdev_work->addr,
2320                                                     switchdev_work->vid);
2321                 else
2322                         err = dsa_port_fdb_add(dp, switchdev_work->addr,
2323                                                switchdev_work->vid);
2324                 if (err) {
2325                         dev_err(ds->dev,
2326                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2327                                 dp->index, switchdev_work->addr,
2328                                 switchdev_work->vid, err);
2329                         break;
2330                 }
2331                 dsa_fdb_offload_notify(switchdev_work);
2332                 break;
2333
2334         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2335                 if (switchdev_work->host_addr)
2336                         err = dsa_port_host_fdb_del(dp, switchdev_work->addr,
2337                                                     switchdev_work->vid);
2338                 else
2339                         err = dsa_port_fdb_del(dp, switchdev_work->addr,
2340                                                switchdev_work->vid);
2341                 if (err) {
2342                         dev_err(ds->dev,
2343                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2344                                 dp->index, switchdev_work->addr,
2345                                 switchdev_work->vid, err);
2346                 }
2347
2348                 break;
2349         }
2350         rtnl_unlock();
2351
2352         dev_put(switchdev_work->dev);
2353         kfree(switchdev_work);
2354 }
2355
2356 static int dsa_lower_dev_walk(struct net_device *lower_dev,
2357                               struct netdev_nested_priv *priv)
2358 {
2359         if (dsa_slave_dev_check(lower_dev)) {
2360                 priv->data = (void *)netdev_priv(lower_dev);
2361                 return 1;
2362         }
2363
2364         return 0;
2365 }
2366
2367 static struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev)
2368 {
2369         struct netdev_nested_priv priv = {
2370                 .data = NULL,
2371         };
2372
2373         netdev_walk_all_lower_dev_rcu(dev, dsa_lower_dev_walk, &priv);
2374
2375         return (struct dsa_slave_priv *)priv.data;
2376 }
2377
2378 /* Called under rcu_read_lock() */
2379 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2380                                      unsigned long event, void *ptr)
2381 {
2382         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2383         const struct switchdev_notifier_fdb_info *fdb_info;
2384         struct dsa_switchdev_event_work *switchdev_work;
2385         bool host_addr = false;
2386         struct dsa_port *dp;
2387         int err;
2388
2389         switch (event) {
2390         case SWITCHDEV_PORT_ATTR_SET:
2391                 err = switchdev_handle_port_attr_set(dev, ptr,
2392                                                      dsa_slave_dev_check,
2393                                                      dsa_slave_port_attr_set);
2394                 return notifier_from_errno(err);
2395         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2396         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2397                 fdb_info = ptr;
2398
2399                 if (dsa_slave_dev_check(dev)) {
2400                         dp = dsa_slave_to_port(dev);
2401
2402                         if (fdb_info->is_local)
2403                                 host_addr = true;
2404                         else if (!fdb_info->added_by_user)
2405                                 return NOTIFY_OK;
2406                 } else {
2407                         /* Snoop addresses added to foreign interfaces
2408                          * bridged with us, or the bridge
2409                          * itself. Dynamically learned addresses can
2410                          * also be added for switches that don't
2411                          * automatically learn SA from CPU-injected
2412                          * traffic.
2413                          */
2414                         struct net_device *br_dev;
2415                         struct dsa_slave_priv *p;
2416
2417                         if (netif_is_bridge_master(dev))
2418                                 br_dev = dev;
2419                         else
2420                                 br_dev = netdev_master_upper_dev_get_rcu(dev);
2421
2422                         if (!br_dev)
2423                                 return NOTIFY_DONE;
2424
2425                         if (!netif_is_bridge_master(br_dev))
2426                                 return NOTIFY_DONE;
2427
2428                         p = dsa_slave_dev_lower_find(br_dev);
2429                         if (!p)
2430                                 return NOTIFY_DONE;
2431
2432                         dp = p->dp;
2433                         host_addr = fdb_info->is_local;
2434
2435                         /* FDB entries learned by the software bridge should
2436                          * be installed as host addresses only if the driver
2437                          * requests assisted learning.
2438                          * On the other hand, FDB entries for local termination
2439                          * should always be installed.
2440                          */
2441                         if (!fdb_info->added_by_user && !fdb_info->is_local &&
2442                             !dp->ds->assisted_learning_on_cpu_port)
2443                                 return NOTIFY_DONE;
2444
2445                         /* When the bridge learns an address on an offloaded
2446                          * LAG we don't want to send traffic to the CPU, the
2447                          * other ports bridged with the LAG should be able to
2448                          * autonomously forward towards it.
2449                          * On the other hand, if the address is local
2450                          * (therefore not learned) then we want to trap it to
2451                          * the CPU regardless of whether the interface it
2452                          * belongs to is offloaded or not.
2453                          */
2454                         if (dsa_tree_offloads_bridge_port(dp->ds->dst, dev) &&
2455                             !fdb_info->is_local)
2456                                 return NOTIFY_DONE;
2457                 }
2458
2459                 if (!dp->ds->ops->port_fdb_add || !dp->ds->ops->port_fdb_del)
2460                         return NOTIFY_DONE;
2461
2462                 switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2463                 if (!switchdev_work)
2464                         return NOTIFY_BAD;
2465
2466                 INIT_WORK(&switchdev_work->work,
2467                           dsa_slave_switchdev_event_work);
2468                 switchdev_work->ds = dp->ds;
2469                 switchdev_work->port = dp->index;
2470                 switchdev_work->event = event;
2471                 switchdev_work->dev = dev;
2472
2473                 ether_addr_copy(switchdev_work->addr,
2474                                 fdb_info->addr);
2475                 switchdev_work->vid = fdb_info->vid;
2476                 switchdev_work->host_addr = host_addr;
2477
2478                 /* Hold a reference for dsa_fdb_offload_notify */
2479                 dev_hold(dev);
2480                 dsa_schedule_work(&switchdev_work->work);
2481                 break;
2482         default:
2483                 return NOTIFY_DONE;
2484         }
2485
2486         return NOTIFY_OK;
2487 }
2488
2489 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2490                                               unsigned long event, void *ptr)
2491 {
2492         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2493         int err;
2494
2495         switch (event) {
2496         case SWITCHDEV_PORT_OBJ_ADD:
2497                 err = switchdev_handle_port_obj_add(dev, ptr,
2498                                                     dsa_slave_dev_check,
2499                                                     dsa_slave_port_obj_add);
2500                 return notifier_from_errno(err);
2501         case SWITCHDEV_PORT_OBJ_DEL:
2502                 err = switchdev_handle_port_obj_del(dev, ptr,
2503                                                     dsa_slave_dev_check,
2504                                                     dsa_slave_port_obj_del);
2505                 return notifier_from_errno(err);
2506         case SWITCHDEV_PORT_ATTR_SET:
2507                 err = switchdev_handle_port_attr_set(dev, ptr,
2508                                                      dsa_slave_dev_check,
2509                                                      dsa_slave_port_attr_set);
2510                 return notifier_from_errno(err);
2511         }
2512
2513         return NOTIFY_DONE;
2514 }
2515
2516 static struct notifier_block dsa_slave_nb __read_mostly = {
2517         .notifier_call  = dsa_slave_netdevice_event,
2518 };
2519
2520 struct notifier_block dsa_slave_switchdev_notifier = {
2521         .notifier_call = dsa_slave_switchdev_event,
2522 };
2523
2524 struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2525         .notifier_call = dsa_slave_switchdev_blocking_event,
2526 };
2527
2528 int dsa_slave_register_notifier(void)
2529 {
2530         struct notifier_block *nb;
2531         int err;
2532
2533         err = register_netdevice_notifier(&dsa_slave_nb);
2534         if (err)
2535                 return err;
2536
2537         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2538         if (err)
2539                 goto err_switchdev_nb;
2540
2541         nb = &dsa_slave_switchdev_blocking_notifier;
2542         err = register_switchdev_blocking_notifier(nb);
2543         if (err)
2544                 goto err_switchdev_blocking_nb;
2545
2546         return 0;
2547
2548 err_switchdev_blocking_nb:
2549         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2550 err_switchdev_nb:
2551         unregister_netdevice_notifier(&dsa_slave_nb);
2552         return err;
2553 }
2554
2555 void dsa_slave_unregister_notifier(void)
2556 {
2557         struct notifier_block *nb;
2558         int err;
2559
2560         nb = &dsa_slave_switchdev_blocking_notifier;
2561         err = unregister_switchdev_blocking_notifier(nb);
2562         if (err)
2563                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2564
2565         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2566         if (err)
2567                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2568
2569         err = unregister_netdevice_notifier(&dsa_slave_nb);
2570         if (err)
2571                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2572 }