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, true);
 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         default:
 318                 ret = -EOPNOTSUPP;
 319                 break;
 320         }
 321
 322         return ret;
 323 }
 324
 325 /* Must be called under rcu_read_lock() */
 326 static int
 327 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 328                                       const struct switchdev_obj_port_vlan *vlan)
 329 {
 330         struct net_device *upper_dev;
 331         struct list_head *iter;
 332
 333         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 334                 u16 vid;
 335
 336                 if (!is_vlan_dev(upper_dev))
 337                         continue;
 338
 339                 vid = vlan_dev_vlan_id(upper_dev);
 340                 if (vid == vlan->vid)
 341                         return -EBUSY;
 342         }
 343
 344         return 0;
 345 }
 346
 347 static int dsa_slave_vlan_add(struct net_device *dev,
 348                               const struct switchdev_obj *obj,
 349                               struct netlink_ext_ack *extack)
 350 {
 351         struct net_device *master = dsa_slave_to_master(dev);
 352         struct dsa_port *dp = dsa_slave_to_port(dev);
 353         struct switchdev_obj_port_vlan vlan;
 354         int err;
 355
 356         if (dsa_port_skip_vlan_configuration(dp)) {
 357                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 358                 return 0;
 359         }
 360
 361         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 362
 363         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 364          * the same VID.
 365          */
 366         if (br_vlan_enabled(dp->bridge_dev)) {
 367                 rcu_read_lock();
 368                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
 369                 rcu_read_unlock();
 370                 if (err) {
 371                         NL_SET_ERR_MSG_MOD(extack,
 372                                            "Port already has a VLAN upper with this VID");
 373                         return err;
 374                 }
 375         }
 376
 377         err = dsa_port_vlan_add(dp, &vlan, extack);
 378         if (err)
 379                 return err;
 380
 381         /* We need the dedicated CPU port to be a member of the VLAN as well.
 382          * Even though drivers often handle CPU membership in special ways,
 383          * it doesn't make sense to program a PVID, so clear this flag.
 384          */
 385         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 386
 387         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, extack);
 388         if (err)
 389                 return err;
 390
 391         return vlan_vid_add(master, htons(ETH_P_8021Q), vlan.vid);
 392 }
 393
 394 static int dsa_slave_port_obj_add(struct net_device *dev, const void *ctx,
 395                                   const struct switchdev_obj *obj,
 396                                   struct netlink_ext_ack *extack)
 397 {
 398         struct dsa_port *dp = dsa_slave_to_port(dev);
 399         int err;
 400
 401         if (ctx && ctx != dp)
 402                 return 0;
 403
 404         switch (obj->id) {
 405         case SWITCHDEV_OBJ_ID_PORT_MDB:
 406                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 407                         return -EOPNOTSUPP;
 408
 409                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 410                 break;
 411         case SWITCHDEV_OBJ_ID_HOST_MDB:
 412                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 413                         return -EOPNOTSUPP;
 414
 415                 err = dsa_port_host_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 416                 break;
 417         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 418                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 419                         return -EOPNOTSUPP;
 420
 421                 err = dsa_slave_vlan_add(dev, obj, extack);
 422                 break;
 423         case SWITCHDEV_OBJ_ID_MRP:
 424                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 425                         return -EOPNOTSUPP;
 426
 427                 err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 428                 break;
 429         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 430                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 431                         return -EOPNOTSUPP;
 432
 433                 err = dsa_port_mrp_add_ring_role(dp,
 434                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 435                 break;
 436         default:
 437                 err = -EOPNOTSUPP;
 438                 break;
 439         }
 440
 441         return err;
 442 }
 443
 444 static int dsa_slave_vlan_del(struct net_device *dev,
 445                               const struct switchdev_obj *obj)
 446 {
 447         struct net_device *master = dsa_slave_to_master(dev);
 448         struct dsa_port *dp = dsa_slave_to_port(dev);
 449         struct switchdev_obj_port_vlan *vlan;
 450         int err;
 451
 452         if (dsa_port_skip_vlan_configuration(dp))
 453                 return 0;
 454
 455         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 456
 457         /* Do not deprogram the CPU port as it may be shared with other user
 458          * ports which can be members of this VLAN as well.
 459          */
 460         err = dsa_port_vlan_del(dp, vlan);
 461         if (err)
 462                 return err;
 463
 464         vlan_vid_del(master, htons(ETH_P_8021Q), vlan->vid);
 465
 466         return 0;
 467 }
 468
 469 static int dsa_slave_port_obj_del(struct net_device *dev, const void *ctx,
 470                                   const struct switchdev_obj *obj)
 471 {
 472         struct dsa_port *dp = dsa_slave_to_port(dev);
 473         int err;
 474
 475         if (ctx && ctx != dp)
 476                 return 0;
 477
 478         switch (obj->id) {
 479         case SWITCHDEV_OBJ_ID_PORT_MDB:
 480                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 481                         return -EOPNOTSUPP;
 482
 483                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 484                 break;
 485         case SWITCHDEV_OBJ_ID_HOST_MDB:
 486                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 487                         return -EOPNOTSUPP;
 488
 489                 err = dsa_port_host_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 490                 break;
 491         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 492                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 493                         return -EOPNOTSUPP;
 494
 495                 err = dsa_slave_vlan_del(dev, obj);
 496                 break;
 497         case SWITCHDEV_OBJ_ID_MRP:
 498                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 499                         return -EOPNOTSUPP;
 500
 501                 err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 502                 break;
 503         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 504                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 505                         return -EOPNOTSUPP;
 506
 507                 err = dsa_port_mrp_del_ring_role(dp,
 508                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 509                 break;
 510         default:
 511                 err = -EOPNOTSUPP;
 512                 break;
 513         }
 514
 515         return err;
 516 }
 517
 518 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 519                                         struct netdev_phys_item_id *ppid)
 520 {
 521         struct dsa_port *dp = dsa_slave_to_port(dev);
 522         struct dsa_switch *ds = dp->ds;
 523         struct dsa_switch_tree *dst = ds->dst;
 524
 525         /* For non-legacy ports, devlink is used and it takes
 526          * care of the name generation. This ndo implementation
 527          * should be removed with legacy support.
 528          */
 529         if (dp->ds->devlink)
 530                 return -EOPNOTSUPP;
 531
 532         ppid->id_len = sizeof(dst->index);
 533         memcpy(&ppid->id, &dst->index, ppid->id_len);
 534
 535         return 0;
 536 }
 537
 538 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 539                                                      struct sk_buff *skb)
 540 {
 541 #ifdef CONFIG_NET_POLL_CONTROLLER
 542         struct dsa_slave_priv *p = netdev_priv(dev);
 543
 544         return netpoll_send_skb(p->netpoll, skb);
 545 #else
 546         BUG();
 547         return NETDEV_TX_OK;
 548 #endif
 549 }
 550
 551 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 552                                  struct sk_buff *skb)
 553 {
 554         struct dsa_switch *ds = p->dp->ds;
 555
 556         if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 557                 return;
 558
 559         if (!ds->ops->port_txtstamp)
 560                 return;
 561
 562         ds->ops->port_txtstamp(ds, p->dp->index, skb);
 563 }
 564
 565 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 566 {
 567         /* SKB for netpoll still need to be mangled with the protocol-specific
 568          * tag to be successfully transmitted
 569          */
 570         if (unlikely(netpoll_tx_running(dev)))
 571                 return dsa_slave_netpoll_send_skb(dev, skb);
 572
 573         /* Queue the SKB for transmission on the parent interface, but
 574          * do not modify its EtherType
 575          */
 576         skb->dev = dsa_slave_to_master(dev);
 577         dev_queue_xmit(skb);
 578
 579         return NETDEV_TX_OK;
 580 }
 581 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 582
 583 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 584 {
 585         int needed_headroom = dev->needed_headroom;
 586         int needed_tailroom = dev->needed_tailroom;
 587
 588         /* For tail taggers, we need to pad short frames ourselves, to ensure
 589          * that the tail tag does not fail at its role of being at the end of
 590          * the packet, once the master interface pads the frame. Account for
 591          * that pad length here, and pad later.
 592          */
 593         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 594                 needed_tailroom += ETH_ZLEN - skb->len;
 595         /* skb_headroom() returns unsigned int... */
 596         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 597         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 598
 599         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 600                 /* No reallocation needed, yay! */
 601                 return 0;
 602
 603         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 604                                 GFP_ATOMIC);
 605 }
 606
 607 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 608 {
 609         struct dsa_slave_priv *p = netdev_priv(dev);
 610         struct sk_buff *nskb;
 611
 612         dev_sw_netstats_tx_add(dev, 1, skb->len);
 613
 614         memset(skb->cb, 0, sizeof(skb->cb));
 615
 616         /* Handle tx timestamp if any */
 617         dsa_skb_tx_timestamp(p, skb);
 618
 619         if (dsa_realloc_skb(skb, dev)) {
 620                 dev_kfree_skb_any(skb);
 621                 return NETDEV_TX_OK;
 622         }
 623
 624         /* needed_tailroom should still be 'warm' in the cache line from
 625          * dsa_realloc_skb(), which has also ensured that padding is safe.
 626          */
 627         if (dev->needed_tailroom)
 628                 eth_skb_pad(skb);
 629
 630         /* Transmit function may have to reallocate the original SKB,
 631          * in which case it must have freed it. Only free it here on error.
 632          */
 633         nskb = p->xmit(skb, dev);
 634         if (!nskb) {
 635                 kfree_skb(skb);
 636                 return NETDEV_TX_OK;
 637         }
 638
 639         return dsa_enqueue_skb(nskb, dev);
 640 }
 641
 642 /* ethtool operations *******************************************************/
 643
 644 static void dsa_slave_get_drvinfo(struct net_device *dev,
 645                                   struct ethtool_drvinfo *drvinfo)
 646 {
 647         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 648         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 649         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 650 }
 651
 652 static int dsa_slave_get_regs_len(struct net_device *dev)
 653 {
 654         struct dsa_port *dp = dsa_slave_to_port(dev);
 655         struct dsa_switch *ds = dp->ds;
 656
 657         if (ds->ops->get_regs_len)
 658                 return ds->ops->get_regs_len(ds, dp->index);
 659
 660         return -EOPNOTSUPP;
 661 }
 662
 663 static void
 664 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 665 {
 666         struct dsa_port *dp = dsa_slave_to_port(dev);
 667         struct dsa_switch *ds = dp->ds;
 668
 669         if (ds->ops->get_regs)
 670                 ds->ops->get_regs(ds, dp->index, regs, _p);
 671 }
 672
 673 static int dsa_slave_nway_reset(struct net_device *dev)
 674 {
 675         struct dsa_port *dp = dsa_slave_to_port(dev);
 676
 677         return phylink_ethtool_nway_reset(dp->pl);
 678 }
 679
 680 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 681 {
 682         struct dsa_port *dp = dsa_slave_to_port(dev);
 683         struct dsa_switch *ds = dp->ds;
 684
 685         if (ds->cd && ds->cd->eeprom_len)
 686                 return ds->cd->eeprom_len;
 687
 688         if (ds->ops->get_eeprom_len)
 689                 return ds->ops->get_eeprom_len(ds);
 690
 691         return 0;
 692 }
 693
 694 static int dsa_slave_get_eeprom(struct net_device *dev,
 695                                 struct ethtool_eeprom *eeprom, u8 *data)
 696 {
 697         struct dsa_port *dp = dsa_slave_to_port(dev);
 698         struct dsa_switch *ds = dp->ds;
 699
 700         if (ds->ops->get_eeprom)
 701                 return ds->ops->get_eeprom(ds, eeprom, data);
 702
 703         return -EOPNOTSUPP;
 704 }
 705
 706 static int dsa_slave_set_eeprom(struct net_device *dev,
 707                                 struct ethtool_eeprom *eeprom, u8 *data)
 708 {
 709         struct dsa_port *dp = dsa_slave_to_port(dev);
 710         struct dsa_switch *ds = dp->ds;
 711
 712         if (ds->ops->set_eeprom)
 713                 return ds->ops->set_eeprom(ds, eeprom, data);
 714
 715         return -EOPNOTSUPP;
 716 }
 717
 718 static void dsa_slave_get_strings(struct net_device *dev,
 719                                   uint32_t stringset, uint8_t *data)
 720 {
 721         struct dsa_port *dp = dsa_slave_to_port(dev);
 722         struct dsa_switch *ds = dp->ds;
 723
 724         if (stringset == ETH_SS_STATS) {
 725                 int len = ETH_GSTRING_LEN;
 726
 727                 strncpy(data, "tx_packets", len);
 728                 strncpy(data + len, "tx_bytes", len);
 729                 strncpy(data + 2 * len, "rx_packets", len);
 730                 strncpy(data + 3 * len, "rx_bytes", len);
 731                 if (ds->ops->get_strings)
 732                         ds->ops->get_strings(ds, dp->index, stringset,
 733                                              data + 4 * len);
 734         } else if (stringset ==  ETH_SS_TEST) {
 735                 net_selftest_get_strings(data);
 736         }
 737
 738 }
 739
 740 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 741                                         struct ethtool_stats *stats,
 742                                         uint64_t *data)
 743 {
 744         struct dsa_port *dp = dsa_slave_to_port(dev);
 745         struct dsa_switch *ds = dp->ds;
 746         struct pcpu_sw_netstats *s;
 747         unsigned int start;
 748         int i;
 749
 750         for_each_possible_cpu(i) {
 751                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 752
 753                 s = per_cpu_ptr(dev->tstats, i);
 754                 do {
 755                         start = u64_stats_fetch_begin_irq(&s->syncp);
 756                         tx_packets = s->tx_packets;
 757                         tx_bytes = s->tx_bytes;
 758                         rx_packets = s->rx_packets;
 759                         rx_bytes = s->rx_bytes;
 760                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 761                 data[0] += tx_packets;
 762                 data[1] += tx_bytes;
 763                 data[2] += rx_packets;
 764                 data[3] += rx_bytes;
 765         }
 766         if (ds->ops->get_ethtool_stats)
 767                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 768 }
 769
 770 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 771 {
 772         struct dsa_port *dp = dsa_slave_to_port(dev);
 773         struct dsa_switch *ds = dp->ds;
 774
 775         if (sset == ETH_SS_STATS) {
 776                 int count = 0;
 777
 778                 if (ds->ops->get_sset_count) {
 779                         count = ds->ops->get_sset_count(ds, dp->index, sset);
 780                         if (count < 0)
 781                                 return count;
 782                 }
 783
 784                 return count + 4;
 785         } else if (sset ==  ETH_SS_TEST) {
 786                 return net_selftest_get_count();
 787         }
 788
 789         return -EOPNOTSUPP;
 790 }
 791
 792 static void dsa_slave_net_selftest(struct net_device *ndev,
 793                                    struct ethtool_test *etest, u64 *buf)
 794 {
 795         struct dsa_port *dp = dsa_slave_to_port(ndev);
 796         struct dsa_switch *ds = dp->ds;
 797
 798         if (ds->ops->self_test) {
 799                 ds->ops->self_test(ds, dp->index, etest, buf);
 800                 return;
 801         }
 802
 803         net_selftest(ndev, etest, buf);
 804 }
 805
 806 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 807 {
 808         struct dsa_port *dp = dsa_slave_to_port(dev);
 809         struct dsa_switch *ds = dp->ds;
 810
 811         phylink_ethtool_get_wol(dp->pl, w);
 812
 813         if (ds->ops->get_wol)
 814                 ds->ops->get_wol(ds, dp->index, w);
 815 }
 816
 817 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 818 {
 819         struct dsa_port *dp = dsa_slave_to_port(dev);
 820         struct dsa_switch *ds = dp->ds;
 821         int ret = -EOPNOTSUPP;
 822
 823         phylink_ethtool_set_wol(dp->pl, w);
 824
 825         if (ds->ops->set_wol)
 826                 ret = ds->ops->set_wol(ds, dp->index, w);
 827
 828         return ret;
 829 }
 830
 831 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 832 {
 833         struct dsa_port *dp = dsa_slave_to_port(dev);
 834         struct dsa_switch *ds = dp->ds;
 835         int ret;
 836
 837         /* Port's PHY and MAC both need to be EEE capable */
 838         if (!dev->phydev || !dp->pl)
 839                 return -ENODEV;
 840
 841         if (!ds->ops->set_mac_eee)
 842                 return -EOPNOTSUPP;
 843
 844         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 845         if (ret)
 846                 return ret;
 847
 848         return phylink_ethtool_set_eee(dp->pl, e);
 849 }
 850
 851 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 852 {
 853         struct dsa_port *dp = dsa_slave_to_port(dev);
 854         struct dsa_switch *ds = dp->ds;
 855         int ret;
 856
 857         /* Port's PHY and MAC both need to be EEE capable */
 858         if (!dev->phydev || !dp->pl)
 859                 return -ENODEV;
 860
 861         if (!ds->ops->get_mac_eee)
 862                 return -EOPNOTSUPP;
 863
 864         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 865         if (ret)
 866                 return ret;
 867
 868         return phylink_ethtool_get_eee(dp->pl, e);
 869 }
 870
 871 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 872                                         struct ethtool_link_ksettings *cmd)
 873 {
 874         struct dsa_port *dp = dsa_slave_to_port(dev);
 875
 876         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 877 }
 878
 879 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 880                                         const struct ethtool_link_ksettings *cmd)
 881 {
 882         struct dsa_port *dp = dsa_slave_to_port(dev);
 883
 884         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 885 }
 886
 887 static void dsa_slave_get_pauseparam(struct net_device *dev,
 888                                      struct ethtool_pauseparam *pause)
 889 {
 890         struct dsa_port *dp = dsa_slave_to_port(dev);
 891
 892         phylink_ethtool_get_pauseparam(dp->pl, pause);
 893 }
 894
 895 static int dsa_slave_set_pauseparam(struct net_device *dev,
 896                                     struct ethtool_pauseparam *pause)
 897 {
 898         struct dsa_port *dp = dsa_slave_to_port(dev);
 899
 900         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 901 }
 902
 903 #ifdef CONFIG_NET_POLL_CONTROLLER
 904 static int dsa_slave_netpoll_setup(struct net_device *dev,
 905                                    struct netpoll_info *ni)
 906 {
 907         struct net_device *master = dsa_slave_to_master(dev);
 908         struct dsa_slave_priv *p = netdev_priv(dev);
 909         struct netpoll *netpoll;
 910         int err = 0;
 911
 912         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 913         if (!netpoll)
 914                 return -ENOMEM;
 915
 916         err = __netpoll_setup(netpoll, master);
 917         if (err) {
 918                 kfree(netpoll);
 919                 goto out;
 920         }
 921
 922         p->netpoll = netpoll;
 923 out:
 924         return err;
 925 }
 926
 927 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 928 {
 929         struct dsa_slave_priv *p = netdev_priv(dev);
 930         struct netpoll *netpoll = p->netpoll;
 931
 932         if (!netpoll)
 933                 return;
 934
 935         p->netpoll = NULL;
 936
 937         __netpoll_free(netpoll);
 938 }
 939
 940 static void dsa_slave_poll_controller(struct net_device *dev)
 941 {
 942 }
 943 #endif
 944
 945 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 946                                         char *name, size_t len)
 947 {
 948         struct dsa_port *dp = dsa_slave_to_port(dev);
 949
 950         /* For non-legacy ports, devlink is used and it takes
 951          * care of the name generation. This ndo implementation
 952          * should be removed with legacy support.
 953          */
 954         if (dp->ds->devlink)
 955                 return -EOPNOTSUPP;
 956
 957         if (snprintf(name, len, "p%d", dp->index) >= len)
 958                 return -EINVAL;
 959
 960         return 0;
 961 }
 962
 963 static struct dsa_mall_tc_entry *
 964 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 965 {
 966         struct dsa_slave_priv *p = netdev_priv(dev);
 967         struct dsa_mall_tc_entry *mall_tc_entry;
 968
 969         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 970                 if (mall_tc_entry->cookie == cookie)
 971                         return mall_tc_entry;
 972
 973         return NULL;
 974 }
 975
 976 static int
 977 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 978                                   struct tc_cls_matchall_offload *cls,
 979                                   bool ingress)
 980 {
 981         struct dsa_port *dp = dsa_slave_to_port(dev);
 982         struct dsa_slave_priv *p = netdev_priv(dev);
 983         struct dsa_mall_mirror_tc_entry *mirror;
 984         struct dsa_mall_tc_entry *mall_tc_entry;
 985         struct dsa_switch *ds = dp->ds;
 986         struct flow_action_entry *act;
 987         struct dsa_port *to_dp;
 988         int err;
 989
 990         if (!ds->ops->port_mirror_add)
 991                 return -EOPNOTSUPP;
 992
 993         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 994                                               cls->common.extack))
 995                 return -EOPNOTSUPP;
 996
 997         act = &cls->rule->action.entries[0];
 998
 999         if (!act->dev)
1000                 return -EINVAL;
1001
1002         if (!dsa_slave_dev_check(act->dev))
1003                 return -EOPNOTSUPP;
1004
1005         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1006         if (!mall_tc_entry)
1007                 return -ENOMEM;
1008
1009         mall_tc_entry->cookie = cls->cookie;
1010         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1011         mirror = &mall_tc_entry->mirror;
1012
1013         to_dp = dsa_slave_to_port(act->dev);
1014
1015         mirror->to_local_port = to_dp->index;
1016         mirror->ingress = ingress;
1017
1018         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
1019         if (err) {
1020                 kfree(mall_tc_entry);
1021                 return err;
1022         }
1023
1024         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1025
1026         return err;
1027 }
1028
1029 static int
1030 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1031                                   struct tc_cls_matchall_offload *cls,
1032                                   bool ingress)
1033 {
1034         struct netlink_ext_ack *extack = cls->common.extack;
1035         struct dsa_port *dp = dsa_slave_to_port(dev);
1036         struct dsa_slave_priv *p = netdev_priv(dev);
1037         struct dsa_mall_policer_tc_entry *policer;
1038         struct dsa_mall_tc_entry *mall_tc_entry;
1039         struct dsa_switch *ds = dp->ds;
1040         struct flow_action_entry *act;
1041         int err;
1042
1043         if (!ds->ops->port_policer_add) {
1044                 NL_SET_ERR_MSG_MOD(extack,
1045                                    "Policing offload not implemented");
1046                 return -EOPNOTSUPP;
1047         }
1048
1049         if (!ingress) {
1050                 NL_SET_ERR_MSG_MOD(extack,
1051                                    "Only supported on ingress qdisc");
1052                 return -EOPNOTSUPP;
1053         }
1054
1055         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1056                                               cls->common.extack))
1057                 return -EOPNOTSUPP;
1058
1059         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1060                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1061                         NL_SET_ERR_MSG_MOD(extack,
1062                                            "Only one port policer allowed");
1063                         return -EEXIST;
1064                 }
1065         }
1066
1067         act = &cls->rule->action.entries[0];
1068
1069         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1070         if (!mall_tc_entry)
1071                 return -ENOMEM;
1072
1073         mall_tc_entry->cookie = cls->cookie;
1074         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1075         policer = &mall_tc_entry->policer;
1076         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1077         policer->burst = act->police.burst;
1078
1079         err = ds->ops->port_policer_add(ds, dp->index, policer);
1080         if (err) {
1081                 kfree(mall_tc_entry);
1082                 return err;
1083         }
1084
1085         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1086
1087         return err;
1088 }
1089
1090 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1091                                       struct tc_cls_matchall_offload *cls,
1092                                       bool ingress)
1093 {
1094         int err = -EOPNOTSUPP;
1095
1096         if (cls->common.protocol == htons(ETH_P_ALL) &&
1097             flow_offload_has_one_action(&cls->rule->action) &&
1098             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1099                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1100         else if (flow_offload_has_one_action(&cls->rule->action) &&
1101                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1102                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1103
1104         return err;
1105 }
1106
1107 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1108                                        struct tc_cls_matchall_offload *cls)
1109 {
1110         struct dsa_port *dp = dsa_slave_to_port(dev);
1111         struct dsa_mall_tc_entry *mall_tc_entry;
1112         struct dsa_switch *ds = dp->ds;
1113
1114         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1115         if (!mall_tc_entry)
1116                 return;
1117
1118         list_del(&mall_tc_entry->list);
1119
1120         switch (mall_tc_entry->type) {
1121         case DSA_PORT_MALL_MIRROR:
1122                 if (ds->ops->port_mirror_del)
1123                         ds->ops->port_mirror_del(ds, dp->index,
1124                                                  &mall_tc_entry->mirror);
1125                 break;
1126         case DSA_PORT_MALL_POLICER:
1127                 if (ds->ops->port_policer_del)
1128                         ds->ops->port_policer_del(ds, dp->index);
1129                 break;
1130         default:
1131                 WARN_ON(1);
1132         }
1133
1134         kfree(mall_tc_entry);
1135 }
1136
1137 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1138                                            struct tc_cls_matchall_offload *cls,
1139                                            bool ingress)
1140 {
1141         if (cls->common.chain_index)
1142                 return -EOPNOTSUPP;
1143
1144         switch (cls->command) {
1145         case TC_CLSMATCHALL_REPLACE:
1146                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1147         case TC_CLSMATCHALL_DESTROY:
1148                 dsa_slave_del_cls_matchall(dev, cls);
1149                 return 0;
1150         default:
1151                 return -EOPNOTSUPP;
1152         }
1153 }
1154
1155 static int dsa_slave_add_cls_flower(struct net_device *dev,
1156                                     struct flow_cls_offload *cls,
1157                                     bool ingress)
1158 {
1159         struct dsa_port *dp = dsa_slave_to_port(dev);
1160         struct dsa_switch *ds = dp->ds;
1161         int port = dp->index;
1162
1163         if (!ds->ops->cls_flower_add)
1164                 return -EOPNOTSUPP;
1165
1166         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1167 }
1168
1169 static int dsa_slave_del_cls_flower(struct net_device *dev,
1170                                     struct flow_cls_offload *cls,
1171                                     bool ingress)
1172 {
1173         struct dsa_port *dp = dsa_slave_to_port(dev);
1174         struct dsa_switch *ds = dp->ds;
1175         int port = dp->index;
1176
1177         if (!ds->ops->cls_flower_del)
1178                 return -EOPNOTSUPP;
1179
1180         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1181 }
1182
1183 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1184                                       struct flow_cls_offload *cls,
1185                                       bool ingress)
1186 {
1187         struct dsa_port *dp = dsa_slave_to_port(dev);
1188         struct dsa_switch *ds = dp->ds;
1189         int port = dp->index;
1190
1191         if (!ds->ops->cls_flower_stats)
1192                 return -EOPNOTSUPP;
1193
1194         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1195 }
1196
1197 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1198                                          struct flow_cls_offload *cls,
1199                                          bool ingress)
1200 {
1201         switch (cls->command) {
1202         case FLOW_CLS_REPLACE:
1203                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1204         case FLOW_CLS_DESTROY:
1205                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1206         case FLOW_CLS_STATS:
1207                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1208         default:
1209                 return -EOPNOTSUPP;
1210         }
1211 }
1212
1213 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1214                                        void *cb_priv, bool ingress)
1215 {
1216         struct net_device *dev = cb_priv;
1217
1218         if (!tc_can_offload(dev))
1219                 return -EOPNOTSUPP;
1220
1221         switch (type) {
1222         case TC_SETUP_CLSMATCHALL:
1223                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1224         case TC_SETUP_CLSFLOWER:
1225                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1226         default:
1227                 return -EOPNOTSUPP;
1228         }
1229 }
1230
1231 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1232                                           void *type_data, void *cb_priv)
1233 {
1234         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1235 }
1236
1237 static int dsa_slave_setup_tc_block_cb_eg(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, false);
1241 }
1242
1243 static LIST_HEAD(dsa_slave_block_cb_list);
1244
1245 static int dsa_slave_setup_tc_block(struct net_device *dev,
1246                                     struct flow_block_offload *f)
1247 {
1248         struct flow_block_cb *block_cb;
1249         flow_setup_cb_t *cb;
1250
1251         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1252                 cb = dsa_slave_setup_tc_block_cb_ig;
1253         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1254                 cb = dsa_slave_setup_tc_block_cb_eg;
1255         else
1256                 return -EOPNOTSUPP;
1257
1258         f->driver_block_list = &dsa_slave_block_cb_list;
1259
1260         switch (f->command) {
1261         case FLOW_BLOCK_BIND:
1262                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1263                         return -EBUSY;
1264
1265                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1266                 if (IS_ERR(block_cb))
1267                         return PTR_ERR(block_cb);
1268
1269                 flow_block_cb_add(block_cb, f);
1270                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1271                 return 0;
1272         case FLOW_BLOCK_UNBIND:
1273                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1274                 if (!block_cb)
1275                         return -ENOENT;
1276
1277                 flow_block_cb_remove(block_cb, f);
1278                 list_del(&block_cb->driver_list);
1279                 return 0;
1280         default:
1281                 return -EOPNOTSUPP;
1282         }
1283 }
1284
1285 static int dsa_slave_setup_ft_block(struct dsa_switch *ds, int port,
1286                                     void *type_data)
1287 {
1288         struct dsa_port *cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1289         struct net_device *master = cpu_dp->master;
1290
1291         if (!master->netdev_ops->ndo_setup_tc)
1292                 return -EOPNOTSUPP;
1293
1294         return master->netdev_ops->ndo_setup_tc(master, TC_SETUP_FT, type_data);
1295 }
1296
1297 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1298                               void *type_data)
1299 {
1300         struct dsa_port *dp = dsa_slave_to_port(dev);
1301         struct dsa_switch *ds = dp->ds;
1302
1303         switch (type) {
1304         case TC_SETUP_BLOCK:
1305                 return dsa_slave_setup_tc_block(dev, type_data);
1306         case TC_SETUP_FT:
1307                 return dsa_slave_setup_ft_block(ds, dp->index, type_data);
1308         default:
1309                 break;
1310         }
1311
1312         if (!ds->ops->port_setup_tc)
1313                 return -EOPNOTSUPP;
1314
1315         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1316 }
1317
1318 static int dsa_slave_get_rxnfc(struct net_device *dev,
1319                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1320 {
1321         struct dsa_port *dp = dsa_slave_to_port(dev);
1322         struct dsa_switch *ds = dp->ds;
1323
1324         if (!ds->ops->get_rxnfc)
1325                 return -EOPNOTSUPP;
1326
1327         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1328 }
1329
1330 static int dsa_slave_set_rxnfc(struct net_device *dev,
1331                                struct ethtool_rxnfc *nfc)
1332 {
1333         struct dsa_port *dp = dsa_slave_to_port(dev);
1334         struct dsa_switch *ds = dp->ds;
1335
1336         if (!ds->ops->set_rxnfc)
1337                 return -EOPNOTSUPP;
1338
1339         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1340 }
1341
1342 static int dsa_slave_get_ts_info(struct net_device *dev,
1343                                  struct ethtool_ts_info *ts)
1344 {
1345         struct dsa_slave_priv *p = netdev_priv(dev);
1346         struct dsa_switch *ds = p->dp->ds;
1347
1348         if (!ds->ops->get_ts_info)
1349                 return -EOPNOTSUPP;
1350
1351         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1352 }
1353
1354 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1355                                      u16 vid)
1356 {
1357         struct net_device *master = dsa_slave_to_master(dev);
1358         struct dsa_port *dp = dsa_slave_to_port(dev);
1359         struct switchdev_obj_port_vlan vlan = {
1360                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1361                 .vid = vid,
1362                 /* This API only allows programming tagged, non-PVID VIDs */
1363                 .flags = 0,
1364         };
1365         struct netlink_ext_ack extack = {0};
1366         int ret;
1367
1368         /* User port... */
1369         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1370         if (ret) {
1371                 if (extack._msg)
1372                         netdev_err(dev, "%s\n", extack._msg);
1373                 return ret;
1374         }
1375
1376         /* And CPU port... */
1377         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &extack);
1378         if (ret) {
1379                 if (extack._msg)
1380                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1381                                    extack._msg);
1382                 return ret;
1383         }
1384
1385         return vlan_vid_add(master, proto, vid);
1386 }
1387
1388 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1389                                       u16 vid)
1390 {
1391         struct net_device *master = dsa_slave_to_master(dev);
1392         struct dsa_port *dp = dsa_slave_to_port(dev);
1393         struct switchdev_obj_port_vlan vlan = {
1394                 .vid = vid,
1395                 /* This API only allows programming tagged, non-PVID VIDs */
1396                 .flags = 0,
1397         };
1398         int err;
1399
1400         /* Do not deprogram the CPU port as it may be shared with other user
1401          * ports which can be members of this VLAN as well.
1402          */
1403         err = dsa_port_vlan_del(dp, &vlan);
1404         if (err)
1405                 return err;
1406
1407         vlan_vid_del(master, proto, vid);
1408
1409         return 0;
1410 }
1411
1412 static int dsa_slave_restore_vlan(struct net_device *vdev, int vid, void *arg)
1413 {
1414         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1415
1416         return dsa_slave_vlan_rx_add_vid(arg, proto, vid);
1417 }
1418
1419 static int dsa_slave_clear_vlan(struct net_device *vdev, int vid, void *arg)
1420 {
1421         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1422
1423         return dsa_slave_vlan_rx_kill_vid(arg, proto, vid);
1424 }
1425
1426 /* Keep the VLAN RX filtering list in sync with the hardware only if VLAN
1427  * filtering is enabled. The baseline is that only ports that offload a
1428  * VLAN-aware bridge are VLAN-aware, and standalone ports are VLAN-unaware,
1429  * but there are exceptions for quirky hardware.
1430  *
1431  * If ds->vlan_filtering_is_global = true, then standalone ports which share
1432  * the same switch with other ports that offload a VLAN-aware bridge are also
1433  * inevitably VLAN-aware.
1434  *
1435  * To summarize, a DSA switch port offloads:
1436  *
1437  * - If standalone (this includes software bridge, software LAG):
1438  *     - if ds->needs_standalone_vlan_filtering = true, OR if
1439  *       (ds->vlan_filtering_is_global = true AND there are bridges spanning
1440  *       this switch chip which have vlan_filtering=1)
1441  *         - the 8021q upper VLANs
1442  *     - else (standalone VLAN filtering is not needed, VLAN filtering is not
1443  *       global, or it is, but no port is under a VLAN-aware bridge):
1444  *         - no VLAN (any 8021q upper is a software VLAN)
1445  *
1446  * - If under a vlan_filtering=0 bridge which it offload:
1447  *     - if ds->configure_vlan_while_not_filtering = true (default):
1448  *         - the bridge VLANs. These VLANs are committed to hardware but inactive.
1449  *     - else (deprecated):
1450  *         - no VLAN. The bridge VLANs are not restored when VLAN awareness is
1451  *           enabled, so this behavior is broken and discouraged.
1452  *
1453  * - If under a vlan_filtering=1 bridge which it offload:
1454  *     - the bridge VLANs
1455  *     - the 8021q upper VLANs
1456  */
1457 int dsa_slave_manage_vlan_filtering(struct net_device *slave,
1458                                     bool vlan_filtering)
1459 {
1460         int err;
1461
1462         if (vlan_filtering) {
1463                 slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1464
1465                 err = vlan_for_each(slave, dsa_slave_restore_vlan, slave);
1466                 if (err) {
1467                         vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1468                         slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1469                         return err;
1470                 }
1471         } else {
1472                 err = vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1473                 if (err)
1474                         return err;
1475
1476                 slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1477         }
1478
1479         return 0;
1480 }
1481
1482 struct dsa_hw_port {
1483         struct list_head list;
1484         struct net_device *dev;
1485         int old_mtu;
1486 };
1487
1488 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1489 {
1490         const struct dsa_hw_port *p;
1491         int err;
1492
1493         list_for_each_entry(p, hw_port_list, list) {
1494                 if (p->dev->mtu == mtu)
1495                         continue;
1496
1497                 err = dev_set_mtu(p->dev, mtu);
1498                 if (err)
1499                         goto rollback;
1500         }
1501
1502         return 0;
1503
1504 rollback:
1505         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1506                 if (p->dev->mtu == p->old_mtu)
1507                         continue;
1508
1509                 if (dev_set_mtu(p->dev, p->old_mtu))
1510                         netdev_err(p->dev, "Failed to restore MTU\n");
1511         }
1512
1513         return err;
1514 }
1515
1516 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1517 {
1518         struct dsa_hw_port *p, *n;
1519
1520         list_for_each_entry_safe(p, n, hw_port_list, list)
1521                 kfree(p);
1522 }
1523
1524 /* Make the hardware datapath to/from @dev limited to a common MTU */
1525 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1526 {
1527         struct list_head hw_port_list;
1528         struct dsa_switch_tree *dst;
1529         int min_mtu = ETH_MAX_MTU;
1530         struct dsa_port *other_dp;
1531         int err;
1532
1533         if (!dp->ds->mtu_enforcement_ingress)
1534                 return;
1535
1536         if (!dp->bridge_dev)
1537                 return;
1538
1539         INIT_LIST_HEAD(&hw_port_list);
1540
1541         /* Populate the list of ports that are part of the same bridge
1542          * as the newly added/modified port
1543          */
1544         list_for_each_entry(dst, &dsa_tree_list, list) {
1545                 list_for_each_entry(other_dp, &dst->ports, list) {
1546                         struct dsa_hw_port *hw_port;
1547                         struct net_device *slave;
1548
1549                         if (other_dp->type != DSA_PORT_TYPE_USER)
1550                                 continue;
1551
1552                         if (other_dp->bridge_dev != dp->bridge_dev)
1553                                 continue;
1554
1555                         if (!other_dp->ds->mtu_enforcement_ingress)
1556                                 continue;
1557
1558                         slave = other_dp->slave;
1559
1560                         if (min_mtu > slave->mtu)
1561                                 min_mtu = slave->mtu;
1562
1563                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1564                         if (!hw_port)
1565                                 goto out;
1566
1567                         hw_port->dev = slave;
1568                         hw_port->old_mtu = slave->mtu;
1569
1570                         list_add(&hw_port->list, &hw_port_list);
1571                 }
1572         }
1573
1574         /* Attempt to configure the entire hardware bridge to the newly added
1575          * interface's MTU first, regardless of whether the intention of the
1576          * user was to raise or lower it.
1577          */
1578         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1579         if (!err)
1580                 goto out;
1581
1582         /* Clearly that didn't work out so well, so just set the minimum MTU on
1583          * all hardware bridge ports now. If this fails too, then all ports will
1584          * still have their old MTU rolled back anyway.
1585          */
1586         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1587
1588 out:
1589         dsa_hw_port_list_free(&hw_port_list);
1590 }
1591
1592 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1593 {
1594         struct net_device *master = dsa_slave_to_master(dev);
1595         struct dsa_port *dp = dsa_slave_to_port(dev);
1596         struct dsa_slave_priv *p = netdev_priv(dev);
1597         struct dsa_switch *ds = p->dp->ds;
1598         struct dsa_port *dp_iter;
1599         struct dsa_port *cpu_dp;
1600         int port = p->dp->index;
1601         int largest_mtu = 0;
1602         int new_master_mtu;
1603         int old_master_mtu;
1604         int mtu_limit;
1605         int cpu_mtu;
1606         int err;
1607
1608         if (!ds->ops->port_change_mtu)
1609                 return -EOPNOTSUPP;
1610
1611         list_for_each_entry(dp_iter, &ds->dst->ports, list) {
1612                 int slave_mtu;
1613
1614                 if (!dsa_port_is_user(dp_iter))
1615                         continue;
1616
1617                 /* During probe, this function will be called for each slave
1618                  * device, while not all of them have been allocated. That's
1619                  * ok, it doesn't change what the maximum is, so ignore it.
1620                  */
1621                 if (!dp_iter->slave)
1622                         continue;
1623
1624                 /* Pretend that we already applied the setting, which we
1625                  * actually haven't (still haven't done all integrity checks)
1626                  */
1627                 if (dp_iter == dp)
1628                         slave_mtu = new_mtu;
1629                 else
1630                         slave_mtu = dp_iter->slave->mtu;
1631
1632                 if (largest_mtu < slave_mtu)
1633                         largest_mtu = slave_mtu;
1634         }
1635
1636         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1637
1638         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1639         old_master_mtu = master->mtu;
1640         new_master_mtu = largest_mtu + dsa_tag_protocol_overhead(cpu_dp->tag_ops);
1641         if (new_master_mtu > mtu_limit)
1642                 return -ERANGE;
1643
1644         /* If the master MTU isn't over limit, there's no need to check the CPU
1645          * MTU, since that surely isn't either.
1646          */
1647         cpu_mtu = largest_mtu;
1648
1649         /* Start applying stuff */
1650         if (new_master_mtu != old_master_mtu) {
1651                 err = dev_set_mtu(master, new_master_mtu);
1652                 if (err < 0)
1653                         goto out_master_failed;
1654
1655                 /* We only need to propagate the MTU of the CPU port to
1656                  * upstream switches, so create a non-targeted notifier which
1657                  * updates all switches.
1658                  */
1659                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, false);
1660                 if (err)
1661                         goto out_cpu_failed;
1662         }
1663
1664         err = dsa_port_mtu_change(dp, new_mtu, true);
1665         if (err)
1666                 goto out_port_failed;
1667
1668         dev->mtu = new_mtu;
1669
1670         dsa_bridge_mtu_normalization(dp);
1671
1672         return 0;
1673
1674 out_port_failed:
1675         if (new_master_mtu != old_master_mtu)
1676                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1677                                     dsa_tag_protocol_overhead(cpu_dp->tag_ops),
1678                                     false);
1679 out_cpu_failed:
1680         if (new_master_mtu != old_master_mtu)
1681                 dev_set_mtu(master, old_master_mtu);
1682 out_master_failed:
1683         return err;
1684 }
1685
1686 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1687         .get_drvinfo            = dsa_slave_get_drvinfo,
1688         .get_regs_len           = dsa_slave_get_regs_len,
1689         .get_regs               = dsa_slave_get_regs,
1690         .nway_reset             = dsa_slave_nway_reset,
1691         .get_link               = ethtool_op_get_link,
1692         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1693         .get_eeprom             = dsa_slave_get_eeprom,
1694         .set_eeprom             = dsa_slave_set_eeprom,
1695         .get_strings            = dsa_slave_get_strings,
1696         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1697         .get_sset_count         = dsa_slave_get_sset_count,
1698         .set_wol                = dsa_slave_set_wol,
1699         .get_wol                = dsa_slave_get_wol,
1700         .set_eee                = dsa_slave_set_eee,
1701         .get_eee                = dsa_slave_get_eee,
1702         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1703         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1704         .get_pauseparam         = dsa_slave_get_pauseparam,
1705         .set_pauseparam         = dsa_slave_set_pauseparam,
1706         .get_rxnfc              = dsa_slave_get_rxnfc,
1707         .set_rxnfc              = dsa_slave_set_rxnfc,
1708         .get_ts_info            = dsa_slave_get_ts_info,
1709         .self_test              = dsa_slave_net_selftest,
1710 };
1711
1712 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1713 {
1714         struct dsa_port *dp = dsa_slave_to_port(dev);
1715
1716         return dp->ds->devlink ? &dp->devlink_port : NULL;
1717 }
1718
1719 static void dsa_slave_get_stats64(struct net_device *dev,
1720                                   struct rtnl_link_stats64 *s)
1721 {
1722         struct dsa_port *dp = dsa_slave_to_port(dev);
1723         struct dsa_switch *ds = dp->ds;
1724
1725         if (ds->ops->get_stats64)
1726                 ds->ops->get_stats64(ds, dp->index, s);
1727         else
1728                 dev_get_tstats64(dev, s);
1729 }
1730
1731 static int dsa_slave_fill_forward_path(struct net_device_path_ctx *ctx,
1732                                        struct net_device_path *path)
1733 {
1734         struct dsa_port *dp = dsa_slave_to_port(ctx->dev);
1735         struct dsa_port *cpu_dp = dp->cpu_dp;
1736
1737         path->dev = ctx->dev;
1738         path->type = DEV_PATH_DSA;
1739         path->dsa.proto = cpu_dp->tag_ops->proto;
1740         path->dsa.port = dp->index;
1741         ctx->dev = cpu_dp->master;
1742
1743         return 0;
1744 }
1745
1746 static const struct net_device_ops dsa_slave_netdev_ops = {
1747         .ndo_open               = dsa_slave_open,
1748         .ndo_stop               = dsa_slave_close,
1749         .ndo_start_xmit         = dsa_slave_xmit,
1750         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1751         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1752         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1753         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1754         .ndo_eth_ioctl          = dsa_slave_ioctl,
1755         .ndo_get_iflink         = dsa_slave_get_iflink,
1756 #ifdef CONFIG_NET_POLL_CONTROLLER
1757         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1758         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1759         .ndo_poll_controller    = dsa_slave_poll_controller,
1760 #endif
1761         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1762         .ndo_setup_tc           = dsa_slave_setup_tc,
1763         .ndo_get_stats64        = dsa_slave_get_stats64,
1764         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1765         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1766         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1767         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1768         .ndo_change_mtu         = dsa_slave_change_mtu,
1769         .ndo_fill_forward_path  = dsa_slave_fill_forward_path,
1770 };
1771
1772 static struct device_type dsa_type = {
1773         .name   = "dsa",
1774 };
1775
1776 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1777 {
1778         const struct dsa_port *dp = dsa_to_port(ds, port);
1779
1780         if (dp->pl)
1781                 phylink_mac_change(dp->pl, up);
1782 }
1783 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1784
1785 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1786                                           struct phylink_link_state *state)
1787 {
1788         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1789         struct dsa_switch *ds = dp->ds;
1790
1791         /* No need to check that this operation is valid, the callback would
1792          * not be called if it was not.
1793          */
1794         ds->ops->phylink_fixed_state(ds, dp->index, state);
1795 }
1796
1797 /* slave device setup *******************************************************/
1798 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr,
1799                                  u32 flags)
1800 {
1801         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1802         struct dsa_switch *ds = dp->ds;
1803
1804         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1805         if (!slave_dev->phydev) {
1806                 netdev_err(slave_dev, "no phy at %d\n", addr);
1807                 return -ENODEV;
1808         }
1809
1810         slave_dev->phydev->dev_flags |= flags;
1811
1812         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1813 }
1814
1815 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1816 {
1817         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1818         struct device_node *port_dn = dp->dn;
1819         struct dsa_switch *ds = dp->ds;
1820         phy_interface_t mode;
1821         u32 phy_flags = 0;
1822         int ret;
1823
1824         ret = of_get_phy_mode(port_dn, &mode);
1825         if (ret)
1826                 mode = PHY_INTERFACE_MODE_NA;
1827
1828         dp->pl_config.dev = &slave_dev->dev;
1829         dp->pl_config.type = PHYLINK_NETDEV;
1830
1831         /* The get_fixed_state callback takes precedence over polling the
1832          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1833          * this if the switch provides such a callback.
1834          */
1835         if (ds->ops->phylink_fixed_state) {
1836                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1837                 dp->pl_config.poll_fixed_state = true;
1838         }
1839
1840         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1841                                 &dsa_port_phylink_mac_ops);
1842         if (IS_ERR(dp->pl)) {
1843                 netdev_err(slave_dev,
1844                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1845                 return PTR_ERR(dp->pl);
1846         }
1847
1848         if (ds->ops->get_phy_flags)
1849                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1850
1851         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1852         if (ret == -ENODEV && ds->slave_mii_bus) {
1853                 /* We could not connect to a designated PHY or SFP, so try to
1854                  * use the switch internal MDIO bus instead
1855                  */
1856                 ret = dsa_slave_phy_connect(slave_dev, dp->index, phy_flags);
1857                 if (ret) {
1858                         netdev_err(slave_dev,
1859                                    "failed to connect to port %d: %d\n",
1860                                    dp->index, ret);
1861                         phylink_destroy(dp->pl);
1862                         return ret;
1863                 }
1864         }
1865
1866         return ret;
1867 }
1868
1869 void dsa_slave_setup_tagger(struct net_device *slave)
1870 {
1871         struct dsa_port *dp = dsa_slave_to_port(slave);
1872         struct dsa_slave_priv *p = netdev_priv(slave);
1873         const struct dsa_port *cpu_dp = dp->cpu_dp;
1874         struct net_device *master = cpu_dp->master;
1875         const struct dsa_switch *ds = dp->ds;
1876
1877         slave->needed_headroom = cpu_dp->tag_ops->needed_headroom;
1878         slave->needed_tailroom = cpu_dp->tag_ops->needed_tailroom;
1879         /* Try to save one extra realloc later in the TX path (in the master)
1880          * by also inheriting the master's needed headroom and tailroom.
1881          * The 8021q driver also does this.
1882          */
1883         slave->needed_headroom += master->needed_headroom;
1884         slave->needed_tailroom += master->needed_tailroom;
1885
1886         p->xmit = cpu_dp->tag_ops->xmit;
1887
1888         slave->features = master->vlan_features | NETIF_F_HW_TC;
1889         slave->hw_features |= NETIF_F_HW_TC;
1890         slave->features |= NETIF_F_LLTX;
1891         if (slave->needed_tailroom)
1892                 slave->features &= ~(NETIF_F_SG | NETIF_F_FRAGLIST);
1893         if (ds->needs_standalone_vlan_filtering)
1894                 slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1895 }
1896
1897 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1898 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1899                                             struct netdev_queue *txq,
1900                                             void *_unused)
1901 {
1902         lockdep_set_class(&txq->_xmit_lock,
1903                           &dsa_slave_netdev_xmit_lock_key);
1904 }
1905
1906 int dsa_slave_suspend(struct net_device *slave_dev)
1907 {
1908         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1909
1910         if (!netif_running(slave_dev))
1911                 return 0;
1912
1913         netif_device_detach(slave_dev);
1914
1915         rtnl_lock();
1916         phylink_stop(dp->pl);
1917         rtnl_unlock();
1918
1919         return 0;
1920 }
1921
1922 int dsa_slave_resume(struct net_device *slave_dev)
1923 {
1924         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1925
1926         if (!netif_running(slave_dev))
1927                 return 0;
1928
1929         netif_device_attach(slave_dev);
1930
1931         rtnl_lock();
1932         phylink_start(dp->pl);
1933         rtnl_unlock();
1934
1935         return 0;
1936 }
1937
1938 int dsa_slave_create(struct dsa_port *port)
1939 {
1940         const struct dsa_port *cpu_dp = port->cpu_dp;
1941         struct net_device *master = cpu_dp->master;
1942         struct dsa_switch *ds = port->ds;
1943         const char *name = port->name;
1944         struct net_device *slave_dev;
1945         struct dsa_slave_priv *p;
1946         int ret;
1947
1948         if (!ds->num_tx_queues)
1949                 ds->num_tx_queues = 1;
1950
1951         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1952                                      NET_NAME_UNKNOWN, ether_setup,
1953                                      ds->num_tx_queues, 1);
1954         if (slave_dev == NULL)
1955                 return -ENOMEM;
1956
1957         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1958         if (!is_zero_ether_addr(port->mac))
1959                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1960         else
1961                 eth_hw_addr_inherit(slave_dev, master);
1962         slave_dev->priv_flags |= IFF_NO_QUEUE;
1963         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1964         if (ds->ops->port_max_mtu)
1965                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1966         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1967
1968         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1969                                  NULL);
1970
1971         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1972         slave_dev->dev.of_node = port->dn;
1973         slave_dev->vlan_features = master->vlan_features;
1974
1975         p = netdev_priv(slave_dev);
1976         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1977         if (!slave_dev->tstats) {
1978                 free_netdev(slave_dev);
1979                 return -ENOMEM;
1980         }
1981
1982         ret = gro_cells_init(&p->gcells, slave_dev);
1983         if (ret)
1984                 goto out_free;
1985
1986         p->dp = port;
1987         INIT_LIST_HEAD(&p->mall_tc_list);
1988         port->slave = slave_dev;
1989         dsa_slave_setup_tagger(slave_dev);
1990
1991         rtnl_lock();
1992         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1993         rtnl_unlock();
1994         if (ret && ret != -EOPNOTSUPP)
1995                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1996                          ret, ETH_DATA_LEN, port->index);
1997
1998         netif_carrier_off(slave_dev);
1999
2000         ret = dsa_slave_phy_setup(slave_dev);
2001         if (ret) {
2002                 netdev_err(slave_dev,
2003                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
2004                            ret, ds->dst->index, ds->index, port->index);
2005                 goto out_gcells;
2006         }
2007
2008         rtnl_lock();
2009
2010         ret = register_netdevice(slave_dev);
2011         if (ret) {
2012                 netdev_err(master, "error %d registering interface %s\n",
2013                            ret, slave_dev->name);
2014                 rtnl_unlock();
2015                 goto out_phy;
2016         }
2017
2018         ret = netdev_upper_dev_link(master, slave_dev, NULL);
2019
2020         rtnl_unlock();
2021
2022         if (ret)
2023                 goto out_unregister;
2024
2025         return 0;
2026
2027 out_unregister:
2028         unregister_netdev(slave_dev);
2029 out_phy:
2030         rtnl_lock();
2031         phylink_disconnect_phy(p->dp->pl);
2032         rtnl_unlock();
2033         phylink_destroy(p->dp->pl);
2034 out_gcells:
2035         gro_cells_destroy(&p->gcells);
2036 out_free:
2037         free_percpu(slave_dev->tstats);
2038         free_netdev(slave_dev);
2039         port->slave = NULL;
2040         return ret;
2041 }
2042
2043 void dsa_slave_destroy(struct net_device *slave_dev)
2044 {
2045         struct net_device *master = dsa_slave_to_master(slave_dev);
2046         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2047         struct dsa_slave_priv *p = netdev_priv(slave_dev);
2048
2049         netif_carrier_off(slave_dev);
2050         rtnl_lock();
2051         netdev_upper_dev_unlink(master, slave_dev);
2052         unregister_netdevice(slave_dev);
2053         phylink_disconnect_phy(dp->pl);
2054         rtnl_unlock();
2055
2056         phylink_destroy(dp->pl);
2057         gro_cells_destroy(&p->gcells);
2058         free_percpu(slave_dev->tstats);
2059         free_netdev(slave_dev);
2060 }
2061
2062 bool dsa_slave_dev_check(const struct net_device *dev)
2063 {
2064         return dev->netdev_ops == &dsa_slave_netdev_ops;
2065 }
2066 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
2067
2068 static int dsa_slave_changeupper(struct net_device *dev,
2069                                  struct netdev_notifier_changeupper_info *info)
2070 {
2071         struct dsa_port *dp = dsa_slave_to_port(dev);
2072         struct netlink_ext_ack *extack;
2073         int err = NOTIFY_DONE;
2074
2075         extack = netdev_notifier_info_to_extack(&info->info);
2076
2077         if (netif_is_bridge_master(info->upper_dev)) {
2078                 if (info->linking) {
2079                         err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2080                         if (!err)
2081                                 dsa_bridge_mtu_normalization(dp);
2082                         if (err == -EOPNOTSUPP) {
2083                                 NL_SET_ERR_MSG_MOD(extack,
2084                                                    "Offloading not supported");
2085                                 err = 0;
2086                         }
2087                         err = notifier_from_errno(err);
2088                 } else {
2089                         dsa_port_bridge_leave(dp, info->upper_dev);
2090                         err = NOTIFY_OK;
2091                 }
2092         } else if (netif_is_lag_master(info->upper_dev)) {
2093                 if (info->linking) {
2094                         err = dsa_port_lag_join(dp, info->upper_dev,
2095                                                 info->upper_info, extack);
2096                         if (err == -EOPNOTSUPP) {
2097                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2098                                                    "Offloading not supported");
2099                                 err = 0;
2100                         }
2101                         err = notifier_from_errno(err);
2102                 } else {
2103                         dsa_port_lag_leave(dp, info->upper_dev);
2104                         err = NOTIFY_OK;
2105                 }
2106         } else if (is_hsr_master(info->upper_dev)) {
2107                 if (info->linking) {
2108                         err = dsa_port_hsr_join(dp, info->upper_dev);
2109                         if (err == -EOPNOTSUPP) {
2110                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2111                                                    "Offloading not supported");
2112                                 err = 0;
2113                         }
2114                         err = notifier_from_errno(err);
2115                 } else {
2116                         dsa_port_hsr_leave(dp, info->upper_dev);
2117                         err = NOTIFY_OK;
2118                 }
2119         }
2120
2121         return err;
2122 }
2123
2124 static int dsa_slave_prechangeupper(struct net_device *dev,
2125                                     struct netdev_notifier_changeupper_info *info)
2126 {
2127         struct dsa_port *dp = dsa_slave_to_port(dev);
2128
2129         if (netif_is_bridge_master(info->upper_dev) && !info->linking)
2130                 dsa_port_pre_bridge_leave(dp, info->upper_dev);
2131         else if (netif_is_lag_master(info->upper_dev) && !info->linking)
2132                 dsa_port_pre_lag_leave(dp, info->upper_dev);
2133         /* dsa_port_pre_hsr_leave is not yet necessary since hsr cannot be
2134          * meaningfully enslaved to a bridge yet
2135          */
2136
2137         return NOTIFY_DONE;
2138 }
2139
2140 static int
2141 dsa_slave_lag_changeupper(struct net_device *dev,
2142                           struct netdev_notifier_changeupper_info *info)
2143 {
2144         struct net_device *lower;
2145         struct list_head *iter;
2146         int err = NOTIFY_DONE;
2147         struct dsa_port *dp;
2148
2149         netdev_for_each_lower_dev(dev, lower, iter) {
2150                 if (!dsa_slave_dev_check(lower))
2151                         continue;
2152
2153                 dp = dsa_slave_to_port(lower);
2154                 if (!dp->lag_dev)
2155                         /* Software LAG */
2156                         continue;
2157
2158                 err = dsa_slave_changeupper(lower, info);
2159                 if (notifier_to_errno(err))
2160                         break;
2161         }
2162
2163         return err;
2164 }
2165
2166 /* Same as dsa_slave_lag_changeupper() except that it calls
2167  * dsa_slave_prechangeupper()
2168  */
2169 static int
2170 dsa_slave_lag_prechangeupper(struct net_device *dev,
2171                              struct netdev_notifier_changeupper_info *info)
2172 {
2173         struct net_device *lower;
2174         struct list_head *iter;
2175         int err = NOTIFY_DONE;
2176         struct dsa_port *dp;
2177
2178         netdev_for_each_lower_dev(dev, lower, iter) {
2179                 if (!dsa_slave_dev_check(lower))
2180                         continue;
2181
2182                 dp = dsa_slave_to_port(lower);
2183                 if (!dp->lag_dev)
2184                         /* Software LAG */
2185                         continue;
2186
2187                 err = dsa_slave_prechangeupper(lower, info);
2188                 if (notifier_to_errno(err))
2189                         break;
2190         }
2191
2192         return err;
2193 }
2194
2195 static int
2196 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2197                                  struct netdev_notifier_changeupper_info *info)
2198 {
2199         struct netlink_ext_ack *ext_ack;
2200         struct net_device *slave;
2201         struct dsa_port *dp;
2202
2203         ext_ack = netdev_notifier_info_to_extack(&info->info);
2204
2205         if (!is_vlan_dev(dev))
2206                 return NOTIFY_DONE;
2207
2208         slave = vlan_dev_real_dev(dev);
2209         if (!dsa_slave_dev_check(slave))
2210                 return NOTIFY_DONE;
2211
2212         dp = dsa_slave_to_port(slave);
2213         if (!dp->bridge_dev)
2214                 return NOTIFY_DONE;
2215
2216         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2217         if (br_vlan_enabled(dp->bridge_dev) &&
2218             netif_is_bridge_master(info->upper_dev) && info->linking) {
2219                 NL_SET_ERR_MSG_MOD(ext_ack,
2220                                    "Cannot enslave VLAN device into VLAN aware bridge");
2221                 return notifier_from_errno(-EINVAL);
2222         }
2223
2224         return NOTIFY_DONE;
2225 }
2226
2227 static int
2228 dsa_slave_check_8021q_upper(struct net_device *dev,
2229                             struct netdev_notifier_changeupper_info *info)
2230 {
2231         struct dsa_port *dp = dsa_slave_to_port(dev);
2232         struct net_device *br = dp->bridge_dev;
2233         struct bridge_vlan_info br_info;
2234         struct netlink_ext_ack *extack;
2235         int err = NOTIFY_DONE;
2236         u16 vid;
2237
2238         if (!br || !br_vlan_enabled(br))
2239                 return NOTIFY_DONE;
2240
2241         extack = netdev_notifier_info_to_extack(&info->info);
2242         vid = vlan_dev_vlan_id(info->upper_dev);
2243
2244         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2245          * device, respectively the VID is not found, returning
2246          * 0 means success, which is a failure for us here.
2247          */
2248         err = br_vlan_get_info(br, vid, &br_info);
2249         if (err == 0) {
2250                 NL_SET_ERR_MSG_MOD(extack,
2251                                    "This VLAN is already configured by the bridge");
2252                 return notifier_from_errno(-EBUSY);
2253         }
2254
2255         return NOTIFY_DONE;
2256 }
2257
2258 static int
2259 dsa_slave_prechangeupper_sanity_check(struct net_device *dev,
2260                                       struct netdev_notifier_changeupper_info *info)
2261 {
2262         struct dsa_switch *ds;
2263         struct dsa_port *dp;
2264         int err;
2265
2266         if (!dsa_slave_dev_check(dev))
2267                 return dsa_prevent_bridging_8021q_upper(dev, info);
2268
2269         dp = dsa_slave_to_port(dev);
2270         ds = dp->ds;
2271
2272         if (ds->ops->port_prechangeupper) {
2273                 err = ds->ops->port_prechangeupper(ds, dp->index, info);
2274                 if (err)
2275                         return notifier_from_errno(err);
2276         }
2277
2278         if (is_vlan_dev(info->upper_dev))
2279                 return dsa_slave_check_8021q_upper(dev, info);
2280
2281         return NOTIFY_DONE;
2282 }
2283
2284 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2285                                      unsigned long event, void *ptr)
2286 {
2287         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2288
2289         switch (event) {
2290         case NETDEV_PRECHANGEUPPER: {
2291                 struct netdev_notifier_changeupper_info *info = ptr;
2292                 int err;
2293
2294                 err = dsa_slave_prechangeupper_sanity_check(dev, info);
2295                 if (err != NOTIFY_DONE)
2296                         return err;
2297
2298                 if (dsa_slave_dev_check(dev))
2299                         return dsa_slave_prechangeupper(dev, ptr);
2300
2301                 if (netif_is_lag_master(dev))
2302                         return dsa_slave_lag_prechangeupper(dev, ptr);
2303
2304                 break;
2305         }
2306         case NETDEV_CHANGEUPPER:
2307                 if (dsa_slave_dev_check(dev))
2308                         return dsa_slave_changeupper(dev, ptr);
2309
2310                 if (netif_is_lag_master(dev))
2311                         return dsa_slave_lag_changeupper(dev, ptr);
2312
2313                 break;
2314         case NETDEV_CHANGELOWERSTATE: {
2315                 struct netdev_notifier_changelowerstate_info *info = ptr;
2316                 struct dsa_port *dp;
2317                 int err;
2318
2319                 if (!dsa_slave_dev_check(dev))
2320                         break;
2321
2322                 dp = dsa_slave_to_port(dev);
2323
2324                 err = dsa_port_lag_change(dp, info->lower_state_info);
2325                 return notifier_from_errno(err);
2326         }
2327         case NETDEV_GOING_DOWN: {
2328                 struct dsa_port *dp, *cpu_dp;
2329                 struct dsa_switch_tree *dst;
2330                 LIST_HEAD(close_list);
2331
2332                 if (!netdev_uses_dsa(dev))
2333                         return NOTIFY_DONE;
2334
2335                 cpu_dp = dev->dsa_ptr;
2336                 dst = cpu_dp->ds->dst;
2337
2338                 list_for_each_entry(dp, &dst->ports, list) {
2339                         if (!dsa_is_user_port(dp->ds, dp->index))
2340                                 continue;
2341
2342                         list_add(&dp->slave->close_list, &close_list);
2343                 }
2344
2345                 dev_close_many(&close_list, true);
2346
2347                 return NOTIFY_OK;
2348         }
2349         default:
2350                 break;
2351         }
2352
2353         return NOTIFY_DONE;
2354 }
2355
2356 static void
2357 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2358 {
2359         struct switchdev_notifier_fdb_info info = {};
2360         struct dsa_switch *ds = switchdev_work->ds;
2361         struct dsa_port *dp;
2362
2363         if (!dsa_is_user_port(ds, switchdev_work->port))
2364                 return;
2365
2366         info.addr = switchdev_work->addr;
2367         info.vid = switchdev_work->vid;
2368         info.offloaded = true;
2369         dp = dsa_to_port(ds, switchdev_work->port);
2370         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2371                                  dp->slave, &info.info, NULL);
2372 }
2373
2374 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2375 {
2376         struct dsa_switchdev_event_work *switchdev_work =
2377                 container_of(work, struct dsa_switchdev_event_work, work);
2378         struct dsa_switch *ds = switchdev_work->ds;
2379         struct dsa_port *dp;
2380         int err;
2381
2382         dp = dsa_to_port(ds, switchdev_work->port);
2383
2384         rtnl_lock();
2385         switch (switchdev_work->event) {
2386         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2387                 if (switchdev_work->host_addr)
2388                         err = dsa_port_host_fdb_add(dp, switchdev_work->addr,
2389                                                     switchdev_work->vid);
2390                 else
2391                         err = dsa_port_fdb_add(dp, switchdev_work->addr,
2392                                                switchdev_work->vid);
2393                 if (err) {
2394                         dev_err(ds->dev,
2395                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2396                                 dp->index, switchdev_work->addr,
2397                                 switchdev_work->vid, err);
2398                         break;
2399                 }
2400                 dsa_fdb_offload_notify(switchdev_work);
2401                 break;
2402
2403         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2404                 if (switchdev_work->host_addr)
2405                         err = dsa_port_host_fdb_del(dp, switchdev_work->addr,
2406                                                     switchdev_work->vid);
2407                 else
2408                         err = dsa_port_fdb_del(dp, switchdev_work->addr,
2409                                                switchdev_work->vid);
2410                 if (err) {
2411                         dev_err(ds->dev,
2412                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2413                                 dp->index, switchdev_work->addr,
2414                                 switchdev_work->vid, err);
2415                 }
2416
2417                 break;
2418         }
2419         rtnl_unlock();
2420
2421         dev_put(switchdev_work->dev);
2422         kfree(switchdev_work);
2423 }
2424
2425 static bool dsa_foreign_dev_check(const struct net_device *dev,
2426                                   const struct net_device *foreign_dev)
2427 {
2428         const struct dsa_port *dp = dsa_slave_to_port(dev);
2429         struct dsa_switch_tree *dst = dp->ds->dst;
2430
2431         if (netif_is_bridge_master(foreign_dev))
2432                 return !dsa_tree_offloads_bridge(dst, foreign_dev);
2433
2434         if (netif_is_bridge_port(foreign_dev))
2435                 return !dsa_tree_offloads_bridge_port(dst, foreign_dev);
2436
2437         /* Everything else is foreign */
2438         return true;
2439 }
2440
2441 static int dsa_slave_fdb_event(struct net_device *dev,
2442                                const struct net_device *orig_dev,
2443                                const void *ctx,
2444                                const struct switchdev_notifier_fdb_info *fdb_info,
2445                                unsigned long event)
2446 {
2447         struct dsa_switchdev_event_work *switchdev_work;
2448         struct dsa_port *dp = dsa_slave_to_port(dev);
2449         bool host_addr = fdb_info->is_local;
2450         struct dsa_switch *ds = dp->ds;
2451
2452         if (ctx && ctx != dp)
2453                 return 0;
2454
2455         if (!ds->ops->port_fdb_add || !ds->ops->port_fdb_del)
2456                 return -EOPNOTSUPP;
2457
2458         if (dsa_slave_dev_check(orig_dev) &&
2459             switchdev_fdb_is_dynamically_learned(fdb_info))
2460                 return 0;
2461
2462         /* FDB entries learned by the software bridge should be installed as
2463          * host addresses only if the driver requests assisted learning.
2464          */
2465         if (switchdev_fdb_is_dynamically_learned(fdb_info) &&
2466             !ds->assisted_learning_on_cpu_port)
2467                 return 0;
2468
2469         /* Also treat FDB entries on foreign interfaces bridged with us as host
2470          * addresses.
2471          */
2472         if (dsa_foreign_dev_check(dev, orig_dev))
2473                 host_addr = true;
2474
2475         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2476         if (!switchdev_work)
2477                 return -ENOMEM;
2478
2479         netdev_dbg(dev, "%s FDB entry towards %s, addr %pM vid %d%s\n",
2480                    event == SWITCHDEV_FDB_ADD_TO_DEVICE ? "Adding" : "Deleting",
2481                    orig_dev->name, fdb_info->addr, fdb_info->vid,
2482                    host_addr ? " as host address" : "");
2483
2484         INIT_WORK(&switchdev_work->work, dsa_slave_switchdev_event_work);
2485         switchdev_work->ds = ds;
2486         switchdev_work->port = dp->index;
2487         switchdev_work->event = event;
2488         switchdev_work->dev = dev;
2489
2490         ether_addr_copy(switchdev_work->addr, fdb_info->addr);
2491         switchdev_work->vid = fdb_info->vid;
2492         switchdev_work->host_addr = host_addr;
2493
2494         /* Hold a reference for dsa_fdb_offload_notify */
2495         dev_hold(dev);
2496         dsa_schedule_work(&switchdev_work->work);
2497
2498         return 0;
2499 }
2500
2501 static int
2502 dsa_slave_fdb_add_to_device(struct net_device *dev,
2503                             const struct net_device *orig_dev, const void *ctx,
2504                             const struct switchdev_notifier_fdb_info *fdb_info)
2505 {
2506         return dsa_slave_fdb_event(dev, orig_dev, ctx, fdb_info,
2507                                    SWITCHDEV_FDB_ADD_TO_DEVICE);
2508 }
2509
2510 static int
2511 dsa_slave_fdb_del_to_device(struct net_device *dev,
2512                             const struct net_device *orig_dev, const void *ctx,
2513                             const struct switchdev_notifier_fdb_info *fdb_info)
2514 {
2515         return dsa_slave_fdb_event(dev, orig_dev, ctx, fdb_info,
2516                                    SWITCHDEV_FDB_DEL_TO_DEVICE);
2517 }
2518
2519 /* Called under rcu_read_lock() */
2520 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2521                                      unsigned long event, void *ptr)
2522 {
2523         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2524         int err;
2525
2526         switch (event) {
2527         case SWITCHDEV_PORT_ATTR_SET:
2528                 err = switchdev_handle_port_attr_set(dev, ptr,
2529                                                      dsa_slave_dev_check,
2530                                                      dsa_slave_port_attr_set);
2531                 return notifier_from_errno(err);
2532         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2533                 err = switchdev_handle_fdb_add_to_device(dev, ptr,
2534                                                          dsa_slave_dev_check,
2535                                                          dsa_foreign_dev_check,
2536                                                          dsa_slave_fdb_add_to_device,
2537                                                          NULL);
2538                 return notifier_from_errno(err);
2539         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2540                 err = switchdev_handle_fdb_del_to_device(dev, ptr,
2541                                                          dsa_slave_dev_check,
2542                                                          dsa_foreign_dev_check,
2543                                                          dsa_slave_fdb_del_to_device,
2544                                                          NULL);
2545                 return notifier_from_errno(err);
2546         default:
2547                 return NOTIFY_DONE;
2548         }
2549
2550         return NOTIFY_OK;
2551 }
2552
2553 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2554                                               unsigned long event, void *ptr)
2555 {
2556         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2557         int err;
2558
2559         switch (event) {
2560         case SWITCHDEV_PORT_OBJ_ADD:
2561                 err = switchdev_handle_port_obj_add(dev, ptr,
2562                                                     dsa_slave_dev_check,
2563                                                     dsa_slave_port_obj_add);
2564                 return notifier_from_errno(err);
2565         case SWITCHDEV_PORT_OBJ_DEL:
2566                 err = switchdev_handle_port_obj_del(dev, ptr,
2567                                                     dsa_slave_dev_check,
2568                                                     dsa_slave_port_obj_del);
2569                 return notifier_from_errno(err);
2570         case SWITCHDEV_PORT_ATTR_SET:
2571                 err = switchdev_handle_port_attr_set(dev, ptr,
2572                                                      dsa_slave_dev_check,
2573                                                      dsa_slave_port_attr_set);
2574                 return notifier_from_errno(err);
2575         }
2576
2577         return NOTIFY_DONE;
2578 }
2579
2580 static struct notifier_block dsa_slave_nb __read_mostly = {
2581         .notifier_call  = dsa_slave_netdevice_event,
2582 };
2583
2584 struct notifier_block dsa_slave_switchdev_notifier = {
2585         .notifier_call = dsa_slave_switchdev_event,
2586 };
2587
2588 struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2589         .notifier_call = dsa_slave_switchdev_blocking_event,
2590 };
2591
2592 int dsa_slave_register_notifier(void)
2593 {
2594         struct notifier_block *nb;
2595         int err;
2596
2597         err = register_netdevice_notifier(&dsa_slave_nb);
2598         if (err)
2599                 return err;
2600
2601         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2602         if (err)
2603                 goto err_switchdev_nb;
2604
2605         nb = &dsa_slave_switchdev_blocking_notifier;
2606         err = register_switchdev_blocking_notifier(nb);
2607         if (err)
2608                 goto err_switchdev_blocking_nb;
2609
2610         return 0;
2611
2612 err_switchdev_blocking_nb:
2613         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2614 err_switchdev_nb:
2615         unregister_netdevice_notifier(&dsa_slave_nb);
2616         return err;
2617 }
2618
2619 void dsa_slave_unregister_notifier(void)
2620 {
2621         struct notifier_block *nb;
2622         int err;
2623
2624         nb = &dsa_slave_switchdev_blocking_notifier;
2625         err = unregister_switchdev_blocking_notifier(nb);
2626         if (err)
2627                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2628
2629         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2630         if (err)
2631                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2632
2633         err = unregister_netdevice_notifier(&dsa_slave_nb);
2634         if (err)
2635                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2636 }