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         eth_hw_addr_set(dev, 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_get_eth_phy_stats(struct net_device *dev,
 793                                         struct ethtool_eth_phy_stats *phy_stats)
 794 {
 795         struct dsa_port *dp = dsa_slave_to_port(dev);
 796         struct dsa_switch *ds = dp->ds;
 797
 798         if (ds->ops->get_eth_phy_stats)
 799                 ds->ops->get_eth_phy_stats(ds, dp->index, phy_stats);
 800 }
 801
 802 static void dsa_slave_get_eth_mac_stats(struct net_device *dev,
 803                                         struct ethtool_eth_mac_stats *mac_stats)
 804 {
 805         struct dsa_port *dp = dsa_slave_to_port(dev);
 806         struct dsa_switch *ds = dp->ds;
 807
 808         if (ds->ops->get_eth_mac_stats)
 809                 ds->ops->get_eth_mac_stats(ds, dp->index, mac_stats);
 810 }
 811
 812 static void
 813 dsa_slave_get_eth_ctrl_stats(struct net_device *dev,
 814                              struct ethtool_eth_ctrl_stats *ctrl_stats)
 815 {
 816         struct dsa_port *dp = dsa_slave_to_port(dev);
 817         struct dsa_switch *ds = dp->ds;
 818
 819         if (ds->ops->get_eth_ctrl_stats)
 820                 ds->ops->get_eth_ctrl_stats(ds, dp->index, ctrl_stats);
 821 }
 822
 823 static void dsa_slave_net_selftest(struct net_device *ndev,
 824                                    struct ethtool_test *etest, u64 *buf)
 825 {
 826         struct dsa_port *dp = dsa_slave_to_port(ndev);
 827         struct dsa_switch *ds = dp->ds;
 828
 829         if (ds->ops->self_test) {
 830                 ds->ops->self_test(ds, dp->index, etest, buf);
 831                 return;
 832         }
 833
 834         net_selftest(ndev, etest, buf);
 835 }
 836
 837 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 838 {
 839         struct dsa_port *dp = dsa_slave_to_port(dev);
 840         struct dsa_switch *ds = dp->ds;
 841
 842         phylink_ethtool_get_wol(dp->pl, w);
 843
 844         if (ds->ops->get_wol)
 845                 ds->ops->get_wol(ds, dp->index, w);
 846 }
 847
 848 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 849 {
 850         struct dsa_port *dp = dsa_slave_to_port(dev);
 851         struct dsa_switch *ds = dp->ds;
 852         int ret = -EOPNOTSUPP;
 853
 854         phylink_ethtool_set_wol(dp->pl, w);
 855
 856         if (ds->ops->set_wol)
 857                 ret = ds->ops->set_wol(ds, dp->index, w);
 858
 859         return ret;
 860 }
 861
 862 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 863 {
 864         struct dsa_port *dp = dsa_slave_to_port(dev);
 865         struct dsa_switch *ds = dp->ds;
 866         int ret;
 867
 868         /* Port's PHY and MAC both need to be EEE capable */
 869         if (!dev->phydev || !dp->pl)
 870                 return -ENODEV;
 871
 872         if (!ds->ops->set_mac_eee)
 873                 return -EOPNOTSUPP;
 874
 875         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 876         if (ret)
 877                 return ret;
 878
 879         return phylink_ethtool_set_eee(dp->pl, e);
 880 }
 881
 882 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 883 {
 884         struct dsa_port *dp = dsa_slave_to_port(dev);
 885         struct dsa_switch *ds = dp->ds;
 886         int ret;
 887
 888         /* Port's PHY and MAC both need to be EEE capable */
 889         if (!dev->phydev || !dp->pl)
 890                 return -ENODEV;
 891
 892         if (!ds->ops->get_mac_eee)
 893                 return -EOPNOTSUPP;
 894
 895         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 896         if (ret)
 897                 return ret;
 898
 899         return phylink_ethtool_get_eee(dp->pl, e);
 900 }
 901
 902 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 903                                         struct ethtool_link_ksettings *cmd)
 904 {
 905         struct dsa_port *dp = dsa_slave_to_port(dev);
 906
 907         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 908 }
 909
 910 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 911                                         const struct ethtool_link_ksettings *cmd)
 912 {
 913         struct dsa_port *dp = dsa_slave_to_port(dev);
 914
 915         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 916 }
 917
 918 static void dsa_slave_get_pauseparam(struct net_device *dev,
 919                                      struct ethtool_pauseparam *pause)
 920 {
 921         struct dsa_port *dp = dsa_slave_to_port(dev);
 922
 923         phylink_ethtool_get_pauseparam(dp->pl, pause);
 924 }
 925
 926 static int dsa_slave_set_pauseparam(struct net_device *dev,
 927                                     struct ethtool_pauseparam *pause)
 928 {
 929         struct dsa_port *dp = dsa_slave_to_port(dev);
 930
 931         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 932 }
 933
 934 #ifdef CONFIG_NET_POLL_CONTROLLER
 935 static int dsa_slave_netpoll_setup(struct net_device *dev,
 936                                    struct netpoll_info *ni)
 937 {
 938         struct net_device *master = dsa_slave_to_master(dev);
 939         struct dsa_slave_priv *p = netdev_priv(dev);
 940         struct netpoll *netpoll;
 941         int err = 0;
 942
 943         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 944         if (!netpoll)
 945                 return -ENOMEM;
 946
 947         err = __netpoll_setup(netpoll, master);
 948         if (err) {
 949                 kfree(netpoll);
 950                 goto out;
 951         }
 952
 953         p->netpoll = netpoll;
 954 out:
 955         return err;
 956 }
 957
 958 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 959 {
 960         struct dsa_slave_priv *p = netdev_priv(dev);
 961         struct netpoll *netpoll = p->netpoll;
 962
 963         if (!netpoll)
 964                 return;
 965
 966         p->netpoll = NULL;
 967
 968         __netpoll_free(netpoll);
 969 }
 970
 971 static void dsa_slave_poll_controller(struct net_device *dev)
 972 {
 973 }
 974 #endif
 975
 976 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 977                                         char *name, size_t len)
 978 {
 979         struct dsa_port *dp = dsa_slave_to_port(dev);
 980
 981         /* For non-legacy ports, devlink is used and it takes
 982          * care of the name generation. This ndo implementation
 983          * should be removed with legacy support.
 984          */
 985         if (dp->ds->devlink)
 986                 return -EOPNOTSUPP;
 987
 988         if (snprintf(name, len, "p%d", dp->index) >= len)
 989                 return -EINVAL;
 990
 991         return 0;
 992 }
 993
 994 static struct dsa_mall_tc_entry *
 995 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 996 {
 997         struct dsa_slave_priv *p = netdev_priv(dev);
 998         struct dsa_mall_tc_entry *mall_tc_entry;
 999
1000         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
1001                 if (mall_tc_entry->cookie == cookie)
1002                         return mall_tc_entry;
1003
1004         return NULL;
1005 }
1006
1007 static int
1008 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
1009                                   struct tc_cls_matchall_offload *cls,
1010                                   bool ingress)
1011 {
1012         struct dsa_port *dp = dsa_slave_to_port(dev);
1013         struct dsa_slave_priv *p = netdev_priv(dev);
1014         struct dsa_mall_mirror_tc_entry *mirror;
1015         struct dsa_mall_tc_entry *mall_tc_entry;
1016         struct dsa_switch *ds = dp->ds;
1017         struct flow_action_entry *act;
1018         struct dsa_port *to_dp;
1019         int err;
1020
1021         if (!ds->ops->port_mirror_add)
1022                 return -EOPNOTSUPP;
1023
1024         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1025                                               cls->common.extack))
1026                 return -EOPNOTSUPP;
1027
1028         act = &cls->rule->action.entries[0];
1029
1030         if (!act->dev)
1031                 return -EINVAL;
1032
1033         if (!dsa_slave_dev_check(act->dev))
1034                 return -EOPNOTSUPP;
1035
1036         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1037         if (!mall_tc_entry)
1038                 return -ENOMEM;
1039
1040         mall_tc_entry->cookie = cls->cookie;
1041         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1042         mirror = &mall_tc_entry->mirror;
1043
1044         to_dp = dsa_slave_to_port(act->dev);
1045
1046         mirror->to_local_port = to_dp->index;
1047         mirror->ingress = ingress;
1048
1049         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
1050         if (err) {
1051                 kfree(mall_tc_entry);
1052                 return err;
1053         }
1054
1055         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1056
1057         return err;
1058 }
1059
1060 static int
1061 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1062                                   struct tc_cls_matchall_offload *cls,
1063                                   bool ingress)
1064 {
1065         struct netlink_ext_ack *extack = cls->common.extack;
1066         struct dsa_port *dp = dsa_slave_to_port(dev);
1067         struct dsa_slave_priv *p = netdev_priv(dev);
1068         struct dsa_mall_policer_tc_entry *policer;
1069         struct dsa_mall_tc_entry *mall_tc_entry;
1070         struct dsa_switch *ds = dp->ds;
1071         struct flow_action_entry *act;
1072         int err;
1073
1074         if (!ds->ops->port_policer_add) {
1075                 NL_SET_ERR_MSG_MOD(extack,
1076                                    "Policing offload not implemented");
1077                 return -EOPNOTSUPP;
1078         }
1079
1080         if (!ingress) {
1081                 NL_SET_ERR_MSG_MOD(extack,
1082                                    "Only supported on ingress qdisc");
1083                 return -EOPNOTSUPP;
1084         }
1085
1086         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1087                                               cls->common.extack))
1088                 return -EOPNOTSUPP;
1089
1090         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1091                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1092                         NL_SET_ERR_MSG_MOD(extack,
1093                                            "Only one port policer allowed");
1094                         return -EEXIST;
1095                 }
1096         }
1097
1098         act = &cls->rule->action.entries[0];
1099
1100         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1101         if (!mall_tc_entry)
1102                 return -ENOMEM;
1103
1104         mall_tc_entry->cookie = cls->cookie;
1105         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1106         policer = &mall_tc_entry->policer;
1107         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1108         policer->burst = act->police.burst;
1109
1110         err = ds->ops->port_policer_add(ds, dp->index, policer);
1111         if (err) {
1112                 kfree(mall_tc_entry);
1113                 return err;
1114         }
1115
1116         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1117
1118         return err;
1119 }
1120
1121 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1122                                       struct tc_cls_matchall_offload *cls,
1123                                       bool ingress)
1124 {
1125         int err = -EOPNOTSUPP;
1126
1127         if (cls->common.protocol == htons(ETH_P_ALL) &&
1128             flow_offload_has_one_action(&cls->rule->action) &&
1129             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1130                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1131         else if (flow_offload_has_one_action(&cls->rule->action) &&
1132                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1133                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1134
1135         return err;
1136 }
1137
1138 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1139                                        struct tc_cls_matchall_offload *cls)
1140 {
1141         struct dsa_port *dp = dsa_slave_to_port(dev);
1142         struct dsa_mall_tc_entry *mall_tc_entry;
1143         struct dsa_switch *ds = dp->ds;
1144
1145         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1146         if (!mall_tc_entry)
1147                 return;
1148
1149         list_del(&mall_tc_entry->list);
1150
1151         switch (mall_tc_entry->type) {
1152         case DSA_PORT_MALL_MIRROR:
1153                 if (ds->ops->port_mirror_del)
1154                         ds->ops->port_mirror_del(ds, dp->index,
1155                                                  &mall_tc_entry->mirror);
1156                 break;
1157         case DSA_PORT_MALL_POLICER:
1158                 if (ds->ops->port_policer_del)
1159                         ds->ops->port_policer_del(ds, dp->index);
1160                 break;
1161         default:
1162                 WARN_ON(1);
1163         }
1164
1165         kfree(mall_tc_entry);
1166 }
1167
1168 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1169                                            struct tc_cls_matchall_offload *cls,
1170                                            bool ingress)
1171 {
1172         if (cls->common.chain_index)
1173                 return -EOPNOTSUPP;
1174
1175         switch (cls->command) {
1176         case TC_CLSMATCHALL_REPLACE:
1177                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1178         case TC_CLSMATCHALL_DESTROY:
1179                 dsa_slave_del_cls_matchall(dev, cls);
1180                 return 0;
1181         default:
1182                 return -EOPNOTSUPP;
1183         }
1184 }
1185
1186 static int dsa_slave_add_cls_flower(struct net_device *dev,
1187                                     struct flow_cls_offload *cls,
1188                                     bool ingress)
1189 {
1190         struct dsa_port *dp = dsa_slave_to_port(dev);
1191         struct dsa_switch *ds = dp->ds;
1192         int port = dp->index;
1193
1194         if (!ds->ops->cls_flower_add)
1195                 return -EOPNOTSUPP;
1196
1197         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1198 }
1199
1200 static int dsa_slave_del_cls_flower(struct net_device *dev,
1201                                     struct flow_cls_offload *cls,
1202                                     bool ingress)
1203 {
1204         struct dsa_port *dp = dsa_slave_to_port(dev);
1205         struct dsa_switch *ds = dp->ds;
1206         int port = dp->index;
1207
1208         if (!ds->ops->cls_flower_del)
1209                 return -EOPNOTSUPP;
1210
1211         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1212 }
1213
1214 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1215                                       struct flow_cls_offload *cls,
1216                                       bool ingress)
1217 {
1218         struct dsa_port *dp = dsa_slave_to_port(dev);
1219         struct dsa_switch *ds = dp->ds;
1220         int port = dp->index;
1221
1222         if (!ds->ops->cls_flower_stats)
1223                 return -EOPNOTSUPP;
1224
1225         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1226 }
1227
1228 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1229                                          struct flow_cls_offload *cls,
1230                                          bool ingress)
1231 {
1232         switch (cls->command) {
1233         case FLOW_CLS_REPLACE:
1234                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1235         case FLOW_CLS_DESTROY:
1236                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1237         case FLOW_CLS_STATS:
1238                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1239         default:
1240                 return -EOPNOTSUPP;
1241         }
1242 }
1243
1244 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1245                                        void *cb_priv, bool ingress)
1246 {
1247         struct net_device *dev = cb_priv;
1248
1249         if (!tc_can_offload(dev))
1250                 return -EOPNOTSUPP;
1251
1252         switch (type) {
1253         case TC_SETUP_CLSMATCHALL:
1254                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1255         case TC_SETUP_CLSFLOWER:
1256                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1257         default:
1258                 return -EOPNOTSUPP;
1259         }
1260 }
1261
1262 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1263                                           void *type_data, void *cb_priv)
1264 {
1265         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1266 }
1267
1268 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1269                                           void *type_data, void *cb_priv)
1270 {
1271         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1272 }
1273
1274 static LIST_HEAD(dsa_slave_block_cb_list);
1275
1276 static int dsa_slave_setup_tc_block(struct net_device *dev,
1277                                     struct flow_block_offload *f)
1278 {
1279         struct flow_block_cb *block_cb;
1280         flow_setup_cb_t *cb;
1281
1282         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1283                 cb = dsa_slave_setup_tc_block_cb_ig;
1284         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1285                 cb = dsa_slave_setup_tc_block_cb_eg;
1286         else
1287                 return -EOPNOTSUPP;
1288
1289         f->driver_block_list = &dsa_slave_block_cb_list;
1290
1291         switch (f->command) {
1292         case FLOW_BLOCK_BIND:
1293                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1294                         return -EBUSY;
1295
1296                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1297                 if (IS_ERR(block_cb))
1298                         return PTR_ERR(block_cb);
1299
1300                 flow_block_cb_add(block_cb, f);
1301                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1302                 return 0;
1303         case FLOW_BLOCK_UNBIND:
1304                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1305                 if (!block_cb)
1306                         return -ENOENT;
1307
1308                 flow_block_cb_remove(block_cb, f);
1309                 list_del(&block_cb->driver_list);
1310                 return 0;
1311         default:
1312                 return -EOPNOTSUPP;
1313         }
1314 }
1315
1316 static int dsa_slave_setup_ft_block(struct dsa_switch *ds, int port,
1317                                     void *type_data)
1318 {
1319         struct dsa_port *cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1320         struct net_device *master = cpu_dp->master;
1321
1322         if (!master->netdev_ops->ndo_setup_tc)
1323                 return -EOPNOTSUPP;
1324
1325         return master->netdev_ops->ndo_setup_tc(master, TC_SETUP_FT, type_data);
1326 }
1327
1328 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1329                               void *type_data)
1330 {
1331         struct dsa_port *dp = dsa_slave_to_port(dev);
1332         struct dsa_switch *ds = dp->ds;
1333
1334         switch (type) {
1335         case TC_SETUP_BLOCK:
1336                 return dsa_slave_setup_tc_block(dev, type_data);
1337         case TC_SETUP_FT:
1338                 return dsa_slave_setup_ft_block(ds, dp->index, type_data);
1339         default:
1340                 break;
1341         }
1342
1343         if (!ds->ops->port_setup_tc)
1344                 return -EOPNOTSUPP;
1345
1346         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1347 }
1348
1349 static int dsa_slave_get_rxnfc(struct net_device *dev,
1350                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1351 {
1352         struct dsa_port *dp = dsa_slave_to_port(dev);
1353         struct dsa_switch *ds = dp->ds;
1354
1355         if (!ds->ops->get_rxnfc)
1356                 return -EOPNOTSUPP;
1357
1358         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1359 }
1360
1361 static int dsa_slave_set_rxnfc(struct net_device *dev,
1362                                struct ethtool_rxnfc *nfc)
1363 {
1364         struct dsa_port *dp = dsa_slave_to_port(dev);
1365         struct dsa_switch *ds = dp->ds;
1366
1367         if (!ds->ops->set_rxnfc)
1368                 return -EOPNOTSUPP;
1369
1370         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1371 }
1372
1373 static int dsa_slave_get_ts_info(struct net_device *dev,
1374                                  struct ethtool_ts_info *ts)
1375 {
1376         struct dsa_slave_priv *p = netdev_priv(dev);
1377         struct dsa_switch *ds = p->dp->ds;
1378
1379         if (!ds->ops->get_ts_info)
1380                 return -EOPNOTSUPP;
1381
1382         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1383 }
1384
1385 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1386                                      u16 vid)
1387 {
1388         struct net_device *master = dsa_slave_to_master(dev);
1389         struct dsa_port *dp = dsa_slave_to_port(dev);
1390         struct switchdev_obj_port_vlan vlan = {
1391                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1392                 .vid = vid,
1393                 /* This API only allows programming tagged, non-PVID VIDs */
1394                 .flags = 0,
1395         };
1396         struct netlink_ext_ack extack = {0};
1397         int ret;
1398
1399         /* User port... */
1400         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1401         if (ret) {
1402                 if (extack._msg)
1403                         netdev_err(dev, "%s\n", extack._msg);
1404                 return ret;
1405         }
1406
1407         /* And CPU port... */
1408         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &extack);
1409         if (ret) {
1410                 if (extack._msg)
1411                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1412                                    extack._msg);
1413                 return ret;
1414         }
1415
1416         return vlan_vid_add(master, proto, vid);
1417 }
1418
1419 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1420                                       u16 vid)
1421 {
1422         struct net_device *master = dsa_slave_to_master(dev);
1423         struct dsa_port *dp = dsa_slave_to_port(dev);
1424         struct switchdev_obj_port_vlan vlan = {
1425                 .vid = vid,
1426                 /* This API only allows programming tagged, non-PVID VIDs */
1427                 .flags = 0,
1428         };
1429         int err;
1430
1431         /* Do not deprogram the CPU port as it may be shared with other user
1432          * ports which can be members of this VLAN as well.
1433          */
1434         err = dsa_port_vlan_del(dp, &vlan);
1435         if (err)
1436                 return err;
1437
1438         vlan_vid_del(master, proto, vid);
1439
1440         return 0;
1441 }
1442
1443 static int dsa_slave_restore_vlan(struct net_device *vdev, int vid, void *arg)
1444 {
1445         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1446
1447         return dsa_slave_vlan_rx_add_vid(arg, proto, vid);
1448 }
1449
1450 static int dsa_slave_clear_vlan(struct net_device *vdev, int vid, void *arg)
1451 {
1452         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1453
1454         return dsa_slave_vlan_rx_kill_vid(arg, proto, vid);
1455 }
1456
1457 /* Keep the VLAN RX filtering list in sync with the hardware only if VLAN
1458  * filtering is enabled. The baseline is that only ports that offload a
1459  * VLAN-aware bridge are VLAN-aware, and standalone ports are VLAN-unaware,
1460  * but there are exceptions for quirky hardware.
1461  *
1462  * If ds->vlan_filtering_is_global = true, then standalone ports which share
1463  * the same switch with other ports that offload a VLAN-aware bridge are also
1464  * inevitably VLAN-aware.
1465  *
1466  * To summarize, a DSA switch port offloads:
1467  *
1468  * - If standalone (this includes software bridge, software LAG):
1469  *     - if ds->needs_standalone_vlan_filtering = true, OR if
1470  *       (ds->vlan_filtering_is_global = true AND there are bridges spanning
1471  *       this switch chip which have vlan_filtering=1)
1472  *         - the 8021q upper VLANs
1473  *     - else (standalone VLAN filtering is not needed, VLAN filtering is not
1474  *       global, or it is, but no port is under a VLAN-aware bridge):
1475  *         - no VLAN (any 8021q upper is a software VLAN)
1476  *
1477  * - If under a vlan_filtering=0 bridge which it offload:
1478  *     - if ds->configure_vlan_while_not_filtering = true (default):
1479  *         - the bridge VLANs. These VLANs are committed to hardware but inactive.
1480  *     - else (deprecated):
1481  *         - no VLAN. The bridge VLANs are not restored when VLAN awareness is
1482  *           enabled, so this behavior is broken and discouraged.
1483  *
1484  * - If under a vlan_filtering=1 bridge which it offload:
1485  *     - the bridge VLANs
1486  *     - the 8021q upper VLANs
1487  */
1488 int dsa_slave_manage_vlan_filtering(struct net_device *slave,
1489                                     bool vlan_filtering)
1490 {
1491         int err;
1492
1493         if (vlan_filtering) {
1494                 slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1495
1496                 err = vlan_for_each(slave, dsa_slave_restore_vlan, slave);
1497                 if (err) {
1498                         vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1499                         slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1500                         return err;
1501                 }
1502         } else {
1503                 err = vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1504                 if (err)
1505                         return err;
1506
1507                 slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1508         }
1509
1510         return 0;
1511 }
1512
1513 struct dsa_hw_port {
1514         struct list_head list;
1515         struct net_device *dev;
1516         int old_mtu;
1517 };
1518
1519 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1520 {
1521         const struct dsa_hw_port *p;
1522         int err;
1523
1524         list_for_each_entry(p, hw_port_list, list) {
1525                 if (p->dev->mtu == mtu)
1526                         continue;
1527
1528                 err = dev_set_mtu(p->dev, mtu);
1529                 if (err)
1530                         goto rollback;
1531         }
1532
1533         return 0;
1534
1535 rollback:
1536         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1537                 if (p->dev->mtu == p->old_mtu)
1538                         continue;
1539
1540                 if (dev_set_mtu(p->dev, p->old_mtu))
1541                         netdev_err(p->dev, "Failed to restore MTU\n");
1542         }
1543
1544         return err;
1545 }
1546
1547 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1548 {
1549         struct dsa_hw_port *p, *n;
1550
1551         list_for_each_entry_safe(p, n, hw_port_list, list)
1552                 kfree(p);
1553 }
1554
1555 /* Make the hardware datapath to/from @dev limited to a common MTU */
1556 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1557 {
1558         struct list_head hw_port_list;
1559         struct dsa_switch_tree *dst;
1560         int min_mtu = ETH_MAX_MTU;
1561         struct dsa_port *other_dp;
1562         int err;
1563
1564         if (!dp->ds->mtu_enforcement_ingress)
1565                 return;
1566
1567         if (!dp->bridge_dev)
1568                 return;
1569
1570         INIT_LIST_HEAD(&hw_port_list);
1571
1572         /* Populate the list of ports that are part of the same bridge
1573          * as the newly added/modified port
1574          */
1575         list_for_each_entry(dst, &dsa_tree_list, list) {
1576                 list_for_each_entry(other_dp, &dst->ports, list) {
1577                         struct dsa_hw_port *hw_port;
1578                         struct net_device *slave;
1579
1580                         if (other_dp->type != DSA_PORT_TYPE_USER)
1581                                 continue;
1582
1583                         if (other_dp->bridge_dev != dp->bridge_dev)
1584                                 continue;
1585
1586                         if (!other_dp->ds->mtu_enforcement_ingress)
1587                                 continue;
1588
1589                         slave = other_dp->slave;
1590
1591                         if (min_mtu > slave->mtu)
1592                                 min_mtu = slave->mtu;
1593
1594                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1595                         if (!hw_port)
1596                                 goto out;
1597
1598                         hw_port->dev = slave;
1599                         hw_port->old_mtu = slave->mtu;
1600
1601                         list_add(&hw_port->list, &hw_port_list);
1602                 }
1603         }
1604
1605         /* Attempt to configure the entire hardware bridge to the newly added
1606          * interface's MTU first, regardless of whether the intention of the
1607          * user was to raise or lower it.
1608          */
1609         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1610         if (!err)
1611                 goto out;
1612
1613         /* Clearly that didn't work out so well, so just set the minimum MTU on
1614          * all hardware bridge ports now. If this fails too, then all ports will
1615          * still have their old MTU rolled back anyway.
1616          */
1617         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1618
1619 out:
1620         dsa_hw_port_list_free(&hw_port_list);
1621 }
1622
1623 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1624 {
1625         struct net_device *master = dsa_slave_to_master(dev);
1626         struct dsa_port *dp = dsa_slave_to_port(dev);
1627         struct dsa_slave_priv *p = netdev_priv(dev);
1628         struct dsa_switch *ds = p->dp->ds;
1629         struct dsa_port *dp_iter;
1630         struct dsa_port *cpu_dp;
1631         int port = p->dp->index;
1632         int largest_mtu = 0;
1633         int new_master_mtu;
1634         int old_master_mtu;
1635         int mtu_limit;
1636         int cpu_mtu;
1637         int err;
1638
1639         if (!ds->ops->port_change_mtu)
1640                 return -EOPNOTSUPP;
1641
1642         list_for_each_entry(dp_iter, &ds->dst->ports, list) {
1643                 int slave_mtu;
1644
1645                 if (!dsa_port_is_user(dp_iter))
1646                         continue;
1647
1648                 /* During probe, this function will be called for each slave
1649                  * device, while not all of them have been allocated. That's
1650                  * ok, it doesn't change what the maximum is, so ignore it.
1651                  */
1652                 if (!dp_iter->slave)
1653                         continue;
1654
1655                 /* Pretend that we already applied the setting, which we
1656                  * actually haven't (still haven't done all integrity checks)
1657                  */
1658                 if (dp_iter == dp)
1659                         slave_mtu = new_mtu;
1660                 else
1661                         slave_mtu = dp_iter->slave->mtu;
1662
1663                 if (largest_mtu < slave_mtu)
1664                         largest_mtu = slave_mtu;
1665         }
1666
1667         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1668
1669         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1670         old_master_mtu = master->mtu;
1671         new_master_mtu = largest_mtu + dsa_tag_protocol_overhead(cpu_dp->tag_ops);
1672         if (new_master_mtu > mtu_limit)
1673                 return -ERANGE;
1674
1675         /* If the master MTU isn't over limit, there's no need to check the CPU
1676          * MTU, since that surely isn't either.
1677          */
1678         cpu_mtu = largest_mtu;
1679
1680         /* Start applying stuff */
1681         if (new_master_mtu != old_master_mtu) {
1682                 err = dev_set_mtu(master, new_master_mtu);
1683                 if (err < 0)
1684                         goto out_master_failed;
1685
1686                 /* We only need to propagate the MTU of the CPU port to
1687                  * upstream switches, so create a non-targeted notifier which
1688                  * updates all switches.
1689                  */
1690                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, false);
1691                 if (err)
1692                         goto out_cpu_failed;
1693         }
1694
1695         err = dsa_port_mtu_change(dp, new_mtu, true);
1696         if (err)
1697                 goto out_port_failed;
1698
1699         dev->mtu = new_mtu;
1700
1701         dsa_bridge_mtu_normalization(dp);
1702
1703         return 0;
1704
1705 out_port_failed:
1706         if (new_master_mtu != old_master_mtu)
1707                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1708                                     dsa_tag_protocol_overhead(cpu_dp->tag_ops),
1709                                     false);
1710 out_cpu_failed:
1711         if (new_master_mtu != old_master_mtu)
1712                 dev_set_mtu(master, old_master_mtu);
1713 out_master_failed:
1714         return err;
1715 }
1716
1717 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1718         .get_drvinfo            = dsa_slave_get_drvinfo,
1719         .get_regs_len           = dsa_slave_get_regs_len,
1720         .get_regs               = dsa_slave_get_regs,
1721         .nway_reset             = dsa_slave_nway_reset,
1722         .get_link               = ethtool_op_get_link,
1723         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1724         .get_eeprom             = dsa_slave_get_eeprom,
1725         .set_eeprom             = dsa_slave_set_eeprom,
1726         .get_strings            = dsa_slave_get_strings,
1727         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1728         .get_sset_count         = dsa_slave_get_sset_count,
1729         .get_eth_phy_stats      = dsa_slave_get_eth_phy_stats,
1730         .get_eth_mac_stats      = dsa_slave_get_eth_mac_stats,
1731         .get_eth_ctrl_stats     = dsa_slave_get_eth_ctrl_stats,
1732         .set_wol                = dsa_slave_set_wol,
1733         .get_wol                = dsa_slave_get_wol,
1734         .set_eee                = dsa_slave_set_eee,
1735         .get_eee                = dsa_slave_get_eee,
1736         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1737         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1738         .get_pauseparam         = dsa_slave_get_pauseparam,
1739         .set_pauseparam         = dsa_slave_set_pauseparam,
1740         .get_rxnfc              = dsa_slave_get_rxnfc,
1741         .set_rxnfc              = dsa_slave_set_rxnfc,
1742         .get_ts_info            = dsa_slave_get_ts_info,
1743         .self_test              = dsa_slave_net_selftest,
1744 };
1745
1746 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1747 {
1748         struct dsa_port *dp = dsa_slave_to_port(dev);
1749
1750         return dp->ds->devlink ? &dp->devlink_port : NULL;
1751 }
1752
1753 static void dsa_slave_get_stats64(struct net_device *dev,
1754                                   struct rtnl_link_stats64 *s)
1755 {
1756         struct dsa_port *dp = dsa_slave_to_port(dev);
1757         struct dsa_switch *ds = dp->ds;
1758
1759         if (ds->ops->get_stats64)
1760                 ds->ops->get_stats64(ds, dp->index, s);
1761         else
1762                 dev_get_tstats64(dev, s);
1763 }
1764
1765 static int dsa_slave_fill_forward_path(struct net_device_path_ctx *ctx,
1766                                        struct net_device_path *path)
1767 {
1768         struct dsa_port *dp = dsa_slave_to_port(ctx->dev);
1769         struct dsa_port *cpu_dp = dp->cpu_dp;
1770
1771         path->dev = ctx->dev;
1772         path->type = DEV_PATH_DSA;
1773         path->dsa.proto = cpu_dp->tag_ops->proto;
1774         path->dsa.port = dp->index;
1775         ctx->dev = cpu_dp->master;
1776
1777         return 0;
1778 }
1779
1780 static const struct net_device_ops dsa_slave_netdev_ops = {
1781         .ndo_open               = dsa_slave_open,
1782         .ndo_stop               = dsa_slave_close,
1783         .ndo_start_xmit         = dsa_slave_xmit,
1784         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1785         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1786         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1787         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1788         .ndo_eth_ioctl          = dsa_slave_ioctl,
1789         .ndo_get_iflink         = dsa_slave_get_iflink,
1790 #ifdef CONFIG_NET_POLL_CONTROLLER
1791         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1792         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1793         .ndo_poll_controller    = dsa_slave_poll_controller,
1794 #endif
1795         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1796         .ndo_setup_tc           = dsa_slave_setup_tc,
1797         .ndo_get_stats64        = dsa_slave_get_stats64,
1798         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1799         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1800         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1801         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1802         .ndo_change_mtu         = dsa_slave_change_mtu,
1803         .ndo_fill_forward_path  = dsa_slave_fill_forward_path,
1804 };
1805
1806 static struct device_type dsa_type = {
1807         .name   = "dsa",
1808 };
1809
1810 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1811 {
1812         const struct dsa_port *dp = dsa_to_port(ds, port);
1813
1814         if (dp->pl)
1815                 phylink_mac_change(dp->pl, up);
1816 }
1817 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1818
1819 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1820                                           struct phylink_link_state *state)
1821 {
1822         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1823         struct dsa_switch *ds = dp->ds;
1824
1825         /* No need to check that this operation is valid, the callback would
1826          * not be called if it was not.
1827          */
1828         ds->ops->phylink_fixed_state(ds, dp->index, state);
1829 }
1830
1831 /* slave device setup *******************************************************/
1832 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr,
1833                                  u32 flags)
1834 {
1835         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1836         struct dsa_switch *ds = dp->ds;
1837
1838         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1839         if (!slave_dev->phydev) {
1840                 netdev_err(slave_dev, "no phy at %d\n", addr);
1841                 return -ENODEV;
1842         }
1843
1844         slave_dev->phydev->dev_flags |= flags;
1845
1846         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1847 }
1848
1849 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1850 {
1851         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1852         struct device_node *port_dn = dp->dn;
1853         struct dsa_switch *ds = dp->ds;
1854         phy_interface_t mode;
1855         u32 phy_flags = 0;
1856         int ret;
1857
1858         ret = of_get_phy_mode(port_dn, &mode);
1859         if (ret)
1860                 mode = PHY_INTERFACE_MODE_NA;
1861
1862         dp->pl_config.dev = &slave_dev->dev;
1863         dp->pl_config.type = PHYLINK_NETDEV;
1864
1865         /* The get_fixed_state callback takes precedence over polling the
1866          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1867          * this if the switch provides such a callback.
1868          */
1869         if (ds->ops->phylink_fixed_state) {
1870                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1871                 dp->pl_config.poll_fixed_state = true;
1872         }
1873
1874         if (ds->ops->phylink_get_interfaces)
1875                 ds->ops->phylink_get_interfaces(ds, dp->index,
1876                                         dp->pl_config.supported_interfaces);
1877
1878         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1879                                 &dsa_port_phylink_mac_ops);
1880         if (IS_ERR(dp->pl)) {
1881                 netdev_err(slave_dev,
1882                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1883                 return PTR_ERR(dp->pl);
1884         }
1885
1886         if (ds->ops->get_phy_flags)
1887                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1888
1889         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1890         if (ret == -ENODEV && ds->slave_mii_bus) {
1891                 /* We could not connect to a designated PHY or SFP, so try to
1892                  * use the switch internal MDIO bus instead
1893                  */
1894                 ret = dsa_slave_phy_connect(slave_dev, dp->index, phy_flags);
1895         }
1896         if (ret) {
1897                 netdev_err(slave_dev, "failed to connect to PHY: %pe\n",
1898                            ERR_PTR(ret));
1899                 phylink_destroy(dp->pl);
1900         }
1901
1902         return ret;
1903 }
1904
1905 void dsa_slave_setup_tagger(struct net_device *slave)
1906 {
1907         struct dsa_port *dp = dsa_slave_to_port(slave);
1908         struct dsa_slave_priv *p = netdev_priv(slave);
1909         const struct dsa_port *cpu_dp = dp->cpu_dp;
1910         struct net_device *master = cpu_dp->master;
1911         const struct dsa_switch *ds = dp->ds;
1912
1913         slave->needed_headroom = cpu_dp->tag_ops->needed_headroom;
1914         slave->needed_tailroom = cpu_dp->tag_ops->needed_tailroom;
1915         /* Try to save one extra realloc later in the TX path (in the master)
1916          * by also inheriting the master's needed headroom and tailroom.
1917          * The 8021q driver also does this.
1918          */
1919         slave->needed_headroom += master->needed_headroom;
1920         slave->needed_tailroom += master->needed_tailroom;
1921
1922         p->xmit = cpu_dp->tag_ops->xmit;
1923
1924         slave->features = master->vlan_features | NETIF_F_HW_TC;
1925         slave->hw_features |= NETIF_F_HW_TC;
1926         slave->features |= NETIF_F_LLTX;
1927         if (slave->needed_tailroom)
1928                 slave->features &= ~(NETIF_F_SG | NETIF_F_FRAGLIST);
1929         if (ds->needs_standalone_vlan_filtering)
1930                 slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1931 }
1932
1933 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1934 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1935                                             struct netdev_queue *txq,
1936                                             void *_unused)
1937 {
1938         lockdep_set_class(&txq->_xmit_lock,
1939                           &dsa_slave_netdev_xmit_lock_key);
1940 }
1941
1942 int dsa_slave_suspend(struct net_device *slave_dev)
1943 {
1944         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1945
1946         if (!netif_running(slave_dev))
1947                 return 0;
1948
1949         netif_device_detach(slave_dev);
1950
1951         rtnl_lock();
1952         phylink_stop(dp->pl);
1953         rtnl_unlock();
1954
1955         return 0;
1956 }
1957
1958 int dsa_slave_resume(struct net_device *slave_dev)
1959 {
1960         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1961
1962         if (!netif_running(slave_dev))
1963                 return 0;
1964
1965         netif_device_attach(slave_dev);
1966
1967         rtnl_lock();
1968         phylink_start(dp->pl);
1969         rtnl_unlock();
1970
1971         return 0;
1972 }
1973
1974 int dsa_slave_create(struct dsa_port *port)
1975 {
1976         const struct dsa_port *cpu_dp = port->cpu_dp;
1977         struct net_device *master = cpu_dp->master;
1978         struct dsa_switch *ds = port->ds;
1979         const char *name = port->name;
1980         struct net_device *slave_dev;
1981         struct dsa_slave_priv *p;
1982         int ret;
1983
1984         if (!ds->num_tx_queues)
1985                 ds->num_tx_queues = 1;
1986
1987         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1988                                      NET_NAME_UNKNOWN, ether_setup,
1989                                      ds->num_tx_queues, 1);
1990         if (slave_dev == NULL)
1991                 return -ENOMEM;
1992
1993         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1994         if (!is_zero_ether_addr(port->mac))
1995                 eth_hw_addr_set(slave_dev, port->mac);
1996         else
1997                 eth_hw_addr_inherit(slave_dev, master);
1998         slave_dev->priv_flags |= IFF_NO_QUEUE;
1999         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
2000         if (ds->ops->port_max_mtu)
2001                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
2002         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
2003
2004         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
2005                                  NULL);
2006
2007         SET_NETDEV_DEV(slave_dev, port->ds->dev);
2008         slave_dev->dev.of_node = port->dn;
2009         slave_dev->vlan_features = master->vlan_features;
2010
2011         p = netdev_priv(slave_dev);
2012         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2013         if (!slave_dev->tstats) {
2014                 free_netdev(slave_dev);
2015                 return -ENOMEM;
2016         }
2017
2018         ret = gro_cells_init(&p->gcells, slave_dev);
2019         if (ret)
2020                 goto out_free;
2021
2022         p->dp = port;
2023         INIT_LIST_HEAD(&p->mall_tc_list);
2024         port->slave = slave_dev;
2025         dsa_slave_setup_tagger(slave_dev);
2026
2027         rtnl_lock();
2028         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
2029         rtnl_unlock();
2030         if (ret && ret != -EOPNOTSUPP)
2031                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
2032                          ret, ETH_DATA_LEN, port->index);
2033
2034         netif_carrier_off(slave_dev);
2035
2036         ret = dsa_slave_phy_setup(slave_dev);
2037         if (ret) {
2038                 netdev_err(slave_dev,
2039                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
2040                            ret, ds->dst->index, ds->index, port->index);
2041                 goto out_gcells;
2042         }
2043
2044         rtnl_lock();
2045
2046         ret = register_netdevice(slave_dev);
2047         if (ret) {
2048                 netdev_err(master, "error %d registering interface %s\n",
2049                            ret, slave_dev->name);
2050                 rtnl_unlock();
2051                 goto out_phy;
2052         }
2053
2054         ret = netdev_upper_dev_link(master, slave_dev, NULL);
2055
2056         rtnl_unlock();
2057
2058         if (ret)
2059                 goto out_unregister;
2060
2061         return 0;
2062
2063 out_unregister:
2064         unregister_netdev(slave_dev);
2065 out_phy:
2066         rtnl_lock();
2067         phylink_disconnect_phy(p->dp->pl);
2068         rtnl_unlock();
2069         phylink_destroy(p->dp->pl);
2070 out_gcells:
2071         gro_cells_destroy(&p->gcells);
2072 out_free:
2073         free_percpu(slave_dev->tstats);
2074         free_netdev(slave_dev);
2075         port->slave = NULL;
2076         return ret;
2077 }
2078
2079 void dsa_slave_destroy(struct net_device *slave_dev)
2080 {
2081         struct net_device *master = dsa_slave_to_master(slave_dev);
2082         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2083         struct dsa_slave_priv *p = netdev_priv(slave_dev);
2084
2085         netif_carrier_off(slave_dev);
2086         rtnl_lock();
2087         netdev_upper_dev_unlink(master, slave_dev);
2088         unregister_netdevice(slave_dev);
2089         phylink_disconnect_phy(dp->pl);
2090         rtnl_unlock();
2091
2092         phylink_destroy(dp->pl);
2093         gro_cells_destroy(&p->gcells);
2094         free_percpu(slave_dev->tstats);
2095         free_netdev(slave_dev);
2096 }
2097
2098 bool dsa_slave_dev_check(const struct net_device *dev)
2099 {
2100         return dev->netdev_ops == &dsa_slave_netdev_ops;
2101 }
2102 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
2103
2104 static int dsa_slave_changeupper(struct net_device *dev,
2105                                  struct netdev_notifier_changeupper_info *info)
2106 {
2107         struct dsa_port *dp = dsa_slave_to_port(dev);
2108         struct netlink_ext_ack *extack;
2109         int err = NOTIFY_DONE;
2110
2111         extack = netdev_notifier_info_to_extack(&info->info);
2112
2113         if (netif_is_bridge_master(info->upper_dev)) {
2114                 if (info->linking) {
2115                         err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2116                         if (!err)
2117                                 dsa_bridge_mtu_normalization(dp);
2118                         if (err == -EOPNOTSUPP) {
2119                                 NL_SET_ERR_MSG_MOD(extack,
2120                                                    "Offloading not supported");
2121                                 err = 0;
2122                         }
2123                         err = notifier_from_errno(err);
2124                 } else {
2125                         dsa_port_bridge_leave(dp, info->upper_dev);
2126                         err = NOTIFY_OK;
2127                 }
2128         } else if (netif_is_lag_master(info->upper_dev)) {
2129                 if (info->linking) {
2130                         err = dsa_port_lag_join(dp, info->upper_dev,
2131                                                 info->upper_info, extack);
2132                         if (err == -EOPNOTSUPP) {
2133                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2134                                                    "Offloading not supported");
2135                                 err = 0;
2136                         }
2137                         err = notifier_from_errno(err);
2138                 } else {
2139                         dsa_port_lag_leave(dp, info->upper_dev);
2140                         err = NOTIFY_OK;
2141                 }
2142         } else if (is_hsr_master(info->upper_dev)) {
2143                 if (info->linking) {
2144                         err = dsa_port_hsr_join(dp, info->upper_dev);
2145                         if (err == -EOPNOTSUPP) {
2146                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2147                                                    "Offloading not supported");
2148                                 err = 0;
2149                         }
2150                         err = notifier_from_errno(err);
2151                 } else {
2152                         dsa_port_hsr_leave(dp, info->upper_dev);
2153                         err = NOTIFY_OK;
2154                 }
2155         }
2156
2157         return err;
2158 }
2159
2160 static int dsa_slave_prechangeupper(struct net_device *dev,
2161                                     struct netdev_notifier_changeupper_info *info)
2162 {
2163         struct dsa_port *dp = dsa_slave_to_port(dev);
2164
2165         if (netif_is_bridge_master(info->upper_dev) && !info->linking)
2166                 dsa_port_pre_bridge_leave(dp, info->upper_dev);
2167         else if (netif_is_lag_master(info->upper_dev) && !info->linking)
2168                 dsa_port_pre_lag_leave(dp, info->upper_dev);
2169         /* dsa_port_pre_hsr_leave is not yet necessary since hsr cannot be
2170          * meaningfully enslaved to a bridge yet
2171          */
2172
2173         return NOTIFY_DONE;
2174 }
2175
2176 static int
2177 dsa_slave_lag_changeupper(struct net_device *dev,
2178                           struct netdev_notifier_changeupper_info *info)
2179 {
2180         struct net_device *lower;
2181         struct list_head *iter;
2182         int err = NOTIFY_DONE;
2183         struct dsa_port *dp;
2184
2185         netdev_for_each_lower_dev(dev, lower, iter) {
2186                 if (!dsa_slave_dev_check(lower))
2187                         continue;
2188
2189                 dp = dsa_slave_to_port(lower);
2190                 if (!dp->lag_dev)
2191                         /* Software LAG */
2192                         continue;
2193
2194                 err = dsa_slave_changeupper(lower, info);
2195                 if (notifier_to_errno(err))
2196                         break;
2197         }
2198
2199         return err;
2200 }
2201
2202 /* Same as dsa_slave_lag_changeupper() except that it calls
2203  * dsa_slave_prechangeupper()
2204  */
2205 static int
2206 dsa_slave_lag_prechangeupper(struct net_device *dev,
2207                              struct netdev_notifier_changeupper_info *info)
2208 {
2209         struct net_device *lower;
2210         struct list_head *iter;
2211         int err = NOTIFY_DONE;
2212         struct dsa_port *dp;
2213
2214         netdev_for_each_lower_dev(dev, lower, iter) {
2215                 if (!dsa_slave_dev_check(lower))
2216                         continue;
2217
2218                 dp = dsa_slave_to_port(lower);
2219                 if (!dp->lag_dev)
2220                         /* Software LAG */
2221                         continue;
2222
2223                 err = dsa_slave_prechangeupper(lower, info);
2224                 if (notifier_to_errno(err))
2225                         break;
2226         }
2227
2228         return err;
2229 }
2230
2231 static int
2232 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2233                                  struct netdev_notifier_changeupper_info *info)
2234 {
2235         struct netlink_ext_ack *ext_ack;
2236         struct net_device *slave;
2237         struct dsa_port *dp;
2238
2239         ext_ack = netdev_notifier_info_to_extack(&info->info);
2240
2241         if (!is_vlan_dev(dev))
2242                 return NOTIFY_DONE;
2243
2244         slave = vlan_dev_real_dev(dev);
2245         if (!dsa_slave_dev_check(slave))
2246                 return NOTIFY_DONE;
2247
2248         dp = dsa_slave_to_port(slave);
2249         if (!dp->bridge_dev)
2250                 return NOTIFY_DONE;
2251
2252         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2253         if (br_vlan_enabled(dp->bridge_dev) &&
2254             netif_is_bridge_master(info->upper_dev) && info->linking) {
2255                 NL_SET_ERR_MSG_MOD(ext_ack,
2256                                    "Cannot enslave VLAN device into VLAN aware bridge");
2257                 return notifier_from_errno(-EINVAL);
2258         }
2259
2260         return NOTIFY_DONE;
2261 }
2262
2263 static int
2264 dsa_slave_check_8021q_upper(struct net_device *dev,
2265                             struct netdev_notifier_changeupper_info *info)
2266 {
2267         struct dsa_port *dp = dsa_slave_to_port(dev);
2268         struct net_device *br = dp->bridge_dev;
2269         struct bridge_vlan_info br_info;
2270         struct netlink_ext_ack *extack;
2271         int err = NOTIFY_DONE;
2272         u16 vid;
2273
2274         if (!br || !br_vlan_enabled(br))
2275                 return NOTIFY_DONE;
2276
2277         extack = netdev_notifier_info_to_extack(&info->info);
2278         vid = vlan_dev_vlan_id(info->upper_dev);
2279
2280         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2281          * device, respectively the VID is not found, returning
2282          * 0 means success, which is a failure for us here.
2283          */
2284         err = br_vlan_get_info(br, vid, &br_info);
2285         if (err == 0) {
2286                 NL_SET_ERR_MSG_MOD(extack,
2287                                    "This VLAN is already configured by the bridge");
2288                 return notifier_from_errno(-EBUSY);
2289         }
2290
2291         return NOTIFY_DONE;
2292 }
2293
2294 static int
2295 dsa_slave_prechangeupper_sanity_check(struct net_device *dev,
2296                                       struct netdev_notifier_changeupper_info *info)
2297 {
2298         struct dsa_switch *ds;
2299         struct dsa_port *dp;
2300         int err;
2301
2302         if (!dsa_slave_dev_check(dev))
2303                 return dsa_prevent_bridging_8021q_upper(dev, info);
2304
2305         dp = dsa_slave_to_port(dev);
2306         ds = dp->ds;
2307
2308         if (ds->ops->port_prechangeupper) {
2309                 err = ds->ops->port_prechangeupper(ds, dp->index, info);
2310                 if (err)
2311                         return notifier_from_errno(err);
2312         }
2313
2314         if (is_vlan_dev(info->upper_dev))
2315                 return dsa_slave_check_8021q_upper(dev, info);
2316
2317         return NOTIFY_DONE;
2318 }
2319
2320 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2321                                      unsigned long event, void *ptr)
2322 {
2323         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2324
2325         switch (event) {
2326         case NETDEV_PRECHANGEUPPER: {
2327                 struct netdev_notifier_changeupper_info *info = ptr;
2328                 int err;
2329
2330                 err = dsa_slave_prechangeupper_sanity_check(dev, info);
2331                 if (err != NOTIFY_DONE)
2332                         return err;
2333
2334                 if (dsa_slave_dev_check(dev))
2335                         return dsa_slave_prechangeupper(dev, ptr);
2336
2337                 if (netif_is_lag_master(dev))
2338                         return dsa_slave_lag_prechangeupper(dev, ptr);
2339
2340                 break;
2341         }
2342         case NETDEV_CHANGEUPPER:
2343                 if (dsa_slave_dev_check(dev))
2344                         return dsa_slave_changeupper(dev, ptr);
2345
2346                 if (netif_is_lag_master(dev))
2347                         return dsa_slave_lag_changeupper(dev, ptr);
2348
2349                 break;
2350         case NETDEV_CHANGELOWERSTATE: {
2351                 struct netdev_notifier_changelowerstate_info *info = ptr;
2352                 struct dsa_port *dp;
2353                 int err;
2354
2355                 if (!dsa_slave_dev_check(dev))
2356                         break;
2357
2358                 dp = dsa_slave_to_port(dev);
2359
2360                 err = dsa_port_lag_change(dp, info->lower_state_info);
2361                 return notifier_from_errno(err);
2362         }
2363         case NETDEV_GOING_DOWN: {
2364                 struct dsa_port *dp, *cpu_dp;
2365                 struct dsa_switch_tree *dst;
2366                 LIST_HEAD(close_list);
2367
2368                 if (!netdev_uses_dsa(dev))
2369                         return NOTIFY_DONE;
2370
2371                 cpu_dp = dev->dsa_ptr;
2372                 dst = cpu_dp->ds->dst;
2373
2374                 list_for_each_entry(dp, &dst->ports, list) {
2375                         if (!dsa_port_is_user(dp))
2376                                 continue;
2377
2378                         list_add(&dp->slave->close_list, &close_list);
2379                 }
2380
2381                 dev_close_many(&close_list, true);
2382
2383                 return NOTIFY_OK;
2384         }
2385         default:
2386                 break;
2387         }
2388
2389         return NOTIFY_DONE;
2390 }
2391
2392 static void
2393 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2394 {
2395         struct switchdev_notifier_fdb_info info = {};
2396         struct dsa_switch *ds = switchdev_work->ds;
2397         struct dsa_port *dp;
2398
2399         if (!dsa_is_user_port(ds, switchdev_work->port))
2400                 return;
2401
2402         info.addr = switchdev_work->addr;
2403         info.vid = switchdev_work->vid;
2404         info.offloaded = true;
2405         dp = dsa_to_port(ds, switchdev_work->port);
2406         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2407                                  dp->slave, &info.info, NULL);
2408 }
2409
2410 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2411 {
2412         struct dsa_switchdev_event_work *switchdev_work =
2413                 container_of(work, struct dsa_switchdev_event_work, work);
2414         struct dsa_switch *ds = switchdev_work->ds;
2415         struct dsa_port *dp;
2416         int err;
2417
2418         dp = dsa_to_port(ds, switchdev_work->port);
2419
2420         switch (switchdev_work->event) {
2421         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2422                 if (switchdev_work->host_addr)
2423                         err = dsa_port_host_fdb_add(dp, switchdev_work->addr,
2424                                                     switchdev_work->vid);
2425                 else
2426                         err = dsa_port_fdb_add(dp, switchdev_work->addr,
2427                                                switchdev_work->vid);
2428                 if (err) {
2429                         dev_err(ds->dev,
2430                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2431                                 dp->index, switchdev_work->addr,
2432                                 switchdev_work->vid, err);
2433                         break;
2434                 }
2435                 dsa_fdb_offload_notify(switchdev_work);
2436                 break;
2437
2438         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2439                 if (switchdev_work->host_addr)
2440                         err = dsa_port_host_fdb_del(dp, switchdev_work->addr,
2441                                                     switchdev_work->vid);
2442                 else
2443                         err = dsa_port_fdb_del(dp, switchdev_work->addr,
2444                                                switchdev_work->vid);
2445                 if (err) {
2446                         dev_err(ds->dev,
2447                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2448                                 dp->index, switchdev_work->addr,
2449                                 switchdev_work->vid, err);
2450                 }
2451
2452                 break;
2453         }
2454
2455         kfree(switchdev_work);
2456 }
2457
2458 static bool dsa_foreign_dev_check(const struct net_device *dev,
2459                                   const struct net_device *foreign_dev)
2460 {
2461         const struct dsa_port *dp = dsa_slave_to_port(dev);
2462         struct dsa_switch_tree *dst = dp->ds->dst;
2463
2464         if (netif_is_bridge_master(foreign_dev))
2465                 return !dsa_tree_offloads_bridge(dst, foreign_dev);
2466
2467         if (netif_is_bridge_port(foreign_dev))
2468                 return !dsa_tree_offloads_bridge_port(dst, foreign_dev);
2469
2470         /* Everything else is foreign */
2471         return true;
2472 }
2473
2474 static int dsa_slave_fdb_event(struct net_device *dev,
2475                                struct net_device *orig_dev,
2476                                unsigned long event, const void *ctx,
2477                                const struct switchdev_notifier_fdb_info *fdb_info)
2478 {
2479         struct dsa_switchdev_event_work *switchdev_work;
2480         struct dsa_port *dp = dsa_slave_to_port(dev);
2481         bool host_addr = fdb_info->is_local;
2482         struct dsa_switch *ds = dp->ds;
2483
2484         if (ctx && ctx != dp)
2485                 return 0;
2486
2487         if (!ds->ops->port_fdb_add || !ds->ops->port_fdb_del)
2488                 return -EOPNOTSUPP;
2489
2490         if (dsa_slave_dev_check(orig_dev) &&
2491             switchdev_fdb_is_dynamically_learned(fdb_info))
2492                 return 0;
2493
2494         /* FDB entries learned by the software bridge should be installed as
2495          * host addresses only if the driver requests assisted learning.
2496          */
2497         if (switchdev_fdb_is_dynamically_learned(fdb_info) &&
2498             !ds->assisted_learning_on_cpu_port)
2499                 return 0;
2500
2501         /* Also treat FDB entries on foreign interfaces bridged with us as host
2502          * addresses.
2503          */
2504         if (dsa_foreign_dev_check(dev, orig_dev))
2505                 host_addr = true;
2506
2507         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2508         if (!switchdev_work)
2509                 return -ENOMEM;
2510
2511         netdev_dbg(dev, "%s FDB entry towards %s, addr %pM vid %d%s\n",
2512                    event == SWITCHDEV_FDB_ADD_TO_DEVICE ? "Adding" : "Deleting",
2513                    orig_dev->name, fdb_info->addr, fdb_info->vid,
2514                    host_addr ? " as host address" : "");
2515
2516         INIT_WORK(&switchdev_work->work, dsa_slave_switchdev_event_work);
2517         switchdev_work->ds = ds;
2518         switchdev_work->port = dp->index;
2519         switchdev_work->event = event;
2520         switchdev_work->dev = dev;
2521
2522         ether_addr_copy(switchdev_work->addr, fdb_info->addr);
2523         switchdev_work->vid = fdb_info->vid;
2524         switchdev_work->host_addr = host_addr;
2525
2526         dsa_schedule_work(&switchdev_work->work);
2527
2528         return 0;
2529 }
2530
2531 /* Called under rcu_read_lock() */
2532 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2533                                      unsigned long event, void *ptr)
2534 {
2535         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2536         int err;
2537
2538         switch (event) {
2539         case SWITCHDEV_PORT_ATTR_SET:
2540                 err = switchdev_handle_port_attr_set(dev, ptr,
2541                                                      dsa_slave_dev_check,
2542                                                      dsa_slave_port_attr_set);
2543                 return notifier_from_errno(err);
2544         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2545         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2546                 err = switchdev_handle_fdb_event_to_device(dev, event, ptr,
2547                                                            dsa_slave_dev_check,
2548                                                            dsa_foreign_dev_check,
2549                                                            dsa_slave_fdb_event,
2550                                                            NULL);
2551                 return notifier_from_errno(err);
2552         default:
2553                 return NOTIFY_DONE;
2554         }
2555
2556         return NOTIFY_OK;
2557 }
2558
2559 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2560                                               unsigned long event, void *ptr)
2561 {
2562         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2563         int err;
2564
2565         switch (event) {
2566         case SWITCHDEV_PORT_OBJ_ADD:
2567                 err = switchdev_handle_port_obj_add(dev, ptr,
2568                                                     dsa_slave_dev_check,
2569                                                     dsa_slave_port_obj_add);
2570                 return notifier_from_errno(err);
2571         case SWITCHDEV_PORT_OBJ_DEL:
2572                 err = switchdev_handle_port_obj_del(dev, ptr,
2573                                                     dsa_slave_dev_check,
2574                                                     dsa_slave_port_obj_del);
2575                 return notifier_from_errno(err);
2576         case SWITCHDEV_PORT_ATTR_SET:
2577                 err = switchdev_handle_port_attr_set(dev, ptr,
2578                                                      dsa_slave_dev_check,
2579                                                      dsa_slave_port_attr_set);
2580                 return notifier_from_errno(err);
2581         }
2582
2583         return NOTIFY_DONE;
2584 }
2585
2586 static struct notifier_block dsa_slave_nb __read_mostly = {
2587         .notifier_call  = dsa_slave_netdevice_event,
2588 };
2589
2590 struct notifier_block dsa_slave_switchdev_notifier = {
2591         .notifier_call = dsa_slave_switchdev_event,
2592 };
2593
2594 struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2595         .notifier_call = dsa_slave_switchdev_blocking_event,
2596 };
2597
2598 int dsa_slave_register_notifier(void)
2599 {
2600         struct notifier_block *nb;
2601         int err;
2602
2603         err = register_netdevice_notifier(&dsa_slave_nb);
2604         if (err)
2605                 return err;
2606
2607         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2608         if (err)
2609                 goto err_switchdev_nb;
2610
2611         nb = &dsa_slave_switchdev_blocking_notifier;
2612         err = register_switchdev_blocking_notifier(nb);
2613         if (err)
2614                 goto err_switchdev_blocking_nb;
2615
2616         return 0;
2617
2618 err_switchdev_blocking_nb:
2619         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2620 err_switchdev_nb:
2621         unregister_netdevice_notifier(&dsa_slave_nb);
2622         return err;
2623 }
2624
2625 void dsa_slave_unregister_notifier(void)
2626 {
2627         struct notifier_block *nb;
2628         int err;
2629
2630         nb = &dsa_slave_switchdev_blocking_notifier;
2631         err = unregister_switchdev_blocking_notifier(nb);
2632         if (err)
2633                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2634
2635         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2636         if (err)
2637                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2638
2639         err = unregister_netdevice_notifier(&dsa_slave_nb);
2640         if (err)
2641                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2642 }