net/dsa/slave.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/dsa/slave.c - Slave device handling
   4  * Copyright (c) 2008-2009 Marvell Semiconductor
   5  */
   6
   7 #include <linux/list.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/phy.h>
  11 #include <linux/phy_fixed.h>
  12 #include <linux/phylink.h>
  13 #include <linux/of_net.h>
  14 #include <linux/of_mdio.h>
  15 #include <linux/mdio.h>
  16 #include <net/rtnetlink.h>
  17 #include <net/pkt_cls.h>
  18 #include <net/tc_act/tc_mirred.h>
  19 #include <linux/if_bridge.h>
  20 #include <linux/if_hsr.h>
  21 #include <linux/netpoll.h>
  22 #include <linux/ptp_classify.h>
  23
  24 #include "dsa_priv.h"
  25
  26 /* slave mii_bus handling ***************************************************/
  27 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  28 {
  29         struct dsa_switch *ds = bus->priv;
  30
  31         if (ds->phys_mii_mask & (1 << addr))
  32                 return ds->ops->phy_read(ds, addr, reg);
  33
  34         return 0xffff;
  35 }
  36
  37 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  38 {
  39         struct dsa_switch *ds = bus->priv;
  40
  41         if (ds->phys_mii_mask & (1 << addr))
  42                 return ds->ops->phy_write(ds, addr, reg, val);
  43
  44         return 0;
  45 }
  46
  47 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  48 {
  49         ds->slave_mii_bus->priv = (void *)ds;
  50         ds->slave_mii_bus->name = "dsa slave smi";
  51         ds->slave_mii_bus->read = dsa_slave_phy_read;
  52         ds->slave_mii_bus->write = dsa_slave_phy_write;
  53         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  54                  ds->dst->index, ds->index);
  55         ds->slave_mii_bus->parent = ds->dev;
  56         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  57 }
  58
  59
  60 /* slave device handling ****************************************************/
  61 static int dsa_slave_get_iflink(const struct net_device *dev)
  62 {
  63         return dsa_slave_to_master(dev)->ifindex;
  64 }
  65
  66 static int dsa_slave_open(struct net_device *dev)
  67 {
  68         struct net_device *master = dsa_slave_to_master(dev);
  69         struct dsa_port *dp = dsa_slave_to_port(dev);
  70         int err;
  71
  72         err = dev_open(master, NULL);
  73         if (err < 0) {
  74                 netdev_err(dev, "failed to open master %s\n", master->name);
  75                 goto out;
  76         }
  77
  78         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  79                 err = dev_uc_add(master, dev->dev_addr);
  80                 if (err < 0)
  81                         goto out;
  82         }
  83
  84         if (dev->flags & IFF_ALLMULTI) {
  85                 err = dev_set_allmulti(master, 1);
  86                 if (err < 0)
  87                         goto del_unicast;
  88         }
  89         if (dev->flags & IFF_PROMISC) {
  90                 err = dev_set_promiscuity(master, 1);
  91                 if (err < 0)
  92                         goto clear_allmulti;
  93         }
  94
  95         err = dsa_port_enable_rt(dp, dev->phydev);
  96         if (err)
  97                 goto clear_promisc;
  98
  99         return 0;
 100
 101 clear_promisc:
 102         if (dev->flags & IFF_PROMISC)
 103                 dev_set_promiscuity(master, -1);
 104 clear_allmulti:
 105         if (dev->flags & IFF_ALLMULTI)
 106                 dev_set_allmulti(master, -1);
 107 del_unicast:
 108         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 109                 dev_uc_del(master, dev->dev_addr);
 110 out:
 111         return err;
 112 }
 113
 114 static int dsa_slave_close(struct net_device *dev)
 115 {
 116         struct net_device *master = dsa_slave_to_master(dev);
 117         struct dsa_port *dp = dsa_slave_to_port(dev);
 118
 119         dsa_port_disable_rt(dp);
 120
 121         dev_mc_unsync(master, dev);
 122         dev_uc_unsync(master, dev);
 123         if (dev->flags & IFF_ALLMULTI)
 124                 dev_set_allmulti(master, -1);
 125         if (dev->flags & IFF_PROMISC)
 126                 dev_set_promiscuity(master, -1);
 127
 128         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 129                 dev_uc_del(master, dev->dev_addr);
 130
 131         return 0;
 132 }
 133
 134 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 135 {
 136         struct net_device *master = dsa_slave_to_master(dev);
 137         if (dev->flags & IFF_UP) {
 138                 if (change & IFF_ALLMULTI)
 139                         dev_set_allmulti(master,
 140                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 141                 if (change & IFF_PROMISC)
 142                         dev_set_promiscuity(master,
 143                                             dev->flags & IFF_PROMISC ? 1 : -1);
 144         }
 145 }
 146
 147 static void dsa_slave_set_rx_mode(struct net_device *dev)
 148 {
 149         struct net_device *master = dsa_slave_to_master(dev);
 150
 151         dev_mc_sync(master, dev);
 152         dev_uc_sync(master, dev);
 153 }
 154
 155 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 156 {
 157         struct net_device *master = dsa_slave_to_master(dev);
 158         struct sockaddr *addr = a;
 159         int err;
 160
 161         if (!is_valid_ether_addr(addr->sa_data))
 162                 return -EADDRNOTAVAIL;
 163
 164         if (!(dev->flags & IFF_UP))
 165                 goto out;
 166
 167         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 168                 err = dev_uc_add(master, addr->sa_data);
 169                 if (err < 0)
 170                         return err;
 171         }
 172
 173         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 174                 dev_uc_del(master, dev->dev_addr);
 175
 176 out:
 177         ether_addr_copy(dev->dev_addr, addr->sa_data);
 178
 179         return 0;
 180 }
 181
 182 struct dsa_slave_dump_ctx {
 183         struct net_device *dev;
 184         struct sk_buff *skb;
 185         struct netlink_callback *cb;
 186         int idx;
 187 };
 188
 189 static int
 190 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 191                            bool is_static, void *data)
 192 {
 193         struct dsa_slave_dump_ctx *dump = data;
 194         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 195         u32 seq = dump->cb->nlh->nlmsg_seq;
 196         struct nlmsghdr *nlh;
 197         struct ndmsg *ndm;
 198
 199         if (dump->idx < dump->cb->args[2])
 200                 goto skip;
 201
 202         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 203                         sizeof(*ndm), NLM_F_MULTI);
 204         if (!nlh)
 205                 return -EMSGSIZE;
 206
 207         ndm = nlmsg_data(nlh);
 208         ndm->ndm_family  = AF_BRIDGE;
 209         ndm->ndm_pad1    = 0;
 210         ndm->ndm_pad2    = 0;
 211         ndm->ndm_flags   = NTF_SELF;
 212         ndm->ndm_type    = 0;
 213         ndm->ndm_ifindex = dump->dev->ifindex;
 214         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 215
 216         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 217                 goto nla_put_failure;
 218
 219         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 220                 goto nla_put_failure;
 221
 222         nlmsg_end(dump->skb, nlh);
 223
 224 skip:
 225         dump->idx++;
 226         return 0;
 227
 228 nla_put_failure:
 229         nlmsg_cancel(dump->skb, nlh);
 230         return -EMSGSIZE;
 231 }
 232
 233 static int
 234 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 235                    struct net_device *dev, struct net_device *filter_dev,
 236                    int *idx)
 237 {
 238         struct dsa_port *dp = dsa_slave_to_port(dev);
 239         struct dsa_slave_dump_ctx dump = {
 240                 .dev = dev,
 241                 .skb = skb,
 242                 .cb = cb,
 243                 .idx = *idx,
 244         };
 245         int err;
 246
 247         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 248         *idx = dump.idx;
 249
 250         return err;
 251 }
 252
 253 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 254 {
 255         struct dsa_slave_priv *p = netdev_priv(dev);
 256         struct dsa_switch *ds = p->dp->ds;
 257         int port = p->dp->index;
 258
 259         /* Pass through to switch driver if it supports timestamping */
 260         switch (cmd) {
 261         case SIOCGHWTSTAMP:
 262                 if (ds->ops->port_hwtstamp_get)
 263                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 264                 break;
 265         case SIOCSHWTSTAMP:
 266                 if (ds->ops->port_hwtstamp_set)
 267                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 268                 break;
 269         }
 270
 271         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 272 }
 273
 274 static int dsa_slave_port_attr_set(struct net_device *dev,
 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 (!dsa_port_offloads_netdev(dp, attr->orig_dev))
 282                 return -EOPNOTSUPP;
 283
 284         switch (attr->id) {
 285         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 286                 ret = dsa_port_set_state(dp, attr->u.stp_state);
 287                 break;
 288         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 289                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 290                                               extack);
 291                 break;
 292         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 293                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 294                 break;
 295         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 296                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 297                                                 extack);
 298                 break;
 299         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 300                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 301                 break;
 302         case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 303                 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, extack);
 304                 break;
 305         default:
 306                 ret = -EOPNOTSUPP;
 307                 break;
 308         }
 309
 310         return ret;
 311 }
 312
 313 /* Must be called under rcu_read_lock() */
 314 static int
 315 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 316                                       const struct switchdev_obj_port_vlan *vlan)
 317 {
 318         struct net_device *upper_dev;
 319         struct list_head *iter;
 320
 321         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 322                 u16 vid;
 323
 324                 if (!is_vlan_dev(upper_dev))
 325                         continue;
 326
 327                 vid = vlan_dev_vlan_id(upper_dev);
 328                 if (vid == vlan->vid)
 329                         return -EBUSY;
 330         }
 331
 332         return 0;
 333 }
 334
 335 static int dsa_slave_vlan_add(struct net_device *dev,
 336                               const struct switchdev_obj *obj,
 337                               struct netlink_ext_ack *extack)
 338 {
 339         struct net_device *master = dsa_slave_to_master(dev);
 340         struct dsa_port *dp = dsa_slave_to_port(dev);
 341         struct switchdev_obj_port_vlan vlan;
 342         int err;
 343
 344         if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 345                 return -EOPNOTSUPP;
 346
 347         if (dsa_port_skip_vlan_configuration(dp)) {
 348                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 349                 return 0;
 350         }
 351
 352         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 353
 354         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 355          * the same VID.
 356          */
 357         if (br_vlan_enabled(dp->bridge_dev)) {
 358                 rcu_read_lock();
 359                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
 360                 rcu_read_unlock();
 361                 if (err) {
 362                         NL_SET_ERR_MSG_MOD(extack,
 363                                            "Port already has a VLAN upper with this VID");
 364                         return err;
 365                 }
 366         }
 367
 368         err = dsa_port_vlan_add(dp, &vlan, extack);
 369         if (err)
 370                 return err;
 371
 372         /* We need the dedicated CPU port to be a member of the VLAN as well.
 373          * Even though drivers often handle CPU membership in special ways,
 374          * it doesn't make sense to program a PVID, so clear this flag.
 375          */
 376         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 377
 378         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, extack);
 379         if (err)
 380                 return err;
 381
 382         return vlan_vid_add(master, htons(ETH_P_8021Q), vlan.vid);
 383 }
 384
 385 static int dsa_slave_port_obj_add(struct net_device *dev,
 386                                   const struct switchdev_obj *obj,
 387                                   struct netlink_ext_ack *extack)
 388 {
 389         struct dsa_port *dp = dsa_slave_to_port(dev);
 390         int err;
 391
 392         switch (obj->id) {
 393         case SWITCHDEV_OBJ_ID_PORT_MDB:
 394                 if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 395                         return -EOPNOTSUPP;
 396                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 397                 break;
 398         case SWITCHDEV_OBJ_ID_HOST_MDB:
 399                 /* DSA can directly translate this to a normal MDB add,
 400                  * but on the CPU port.
 401                  */
 402                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 403                 break;
 404         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 405                 err = dsa_slave_vlan_add(dev, obj, extack);
 406                 break;
 407         case SWITCHDEV_OBJ_ID_MRP:
 408                 if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 409                         return -EOPNOTSUPP;
 410                 err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 411                 break;
 412         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 413                 if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 414                         return -EOPNOTSUPP;
 415                 err = dsa_port_mrp_add_ring_role(dp,
 416                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 417                 break;
 418         default:
 419                 err = -EOPNOTSUPP;
 420                 break;
 421         }
 422
 423         return err;
 424 }
 425
 426 static int dsa_slave_vlan_del(struct net_device *dev,
 427                               const struct switchdev_obj *obj)
 428 {
 429         struct net_device *master = dsa_slave_to_master(dev);
 430         struct dsa_port *dp = dsa_slave_to_port(dev);
 431         struct switchdev_obj_port_vlan *vlan;
 432         int err;
 433
 434         if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 435                 return -EOPNOTSUPP;
 436
 437         if (dsa_port_skip_vlan_configuration(dp))
 438                 return 0;
 439
 440         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 441
 442         /* Do not deprogram the CPU port as it may be shared with other user
 443          * ports which can be members of this VLAN as well.
 444          */
 445         err = dsa_port_vlan_del(dp, vlan);
 446         if (err)
 447                 return err;
 448
 449         vlan_vid_del(master, htons(ETH_P_8021Q), vlan->vid);
 450
 451         return 0;
 452 }
 453
 454 static int dsa_slave_port_obj_del(struct net_device *dev,
 455                                   const struct switchdev_obj *obj)
 456 {
 457         struct dsa_port *dp = dsa_slave_to_port(dev);
 458         int err;
 459
 460         switch (obj->id) {
 461         case SWITCHDEV_OBJ_ID_PORT_MDB:
 462                 if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 463                         return -EOPNOTSUPP;
 464                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 465                 break;
 466         case SWITCHDEV_OBJ_ID_HOST_MDB:
 467                 /* DSA can directly translate this to a normal MDB add,
 468                  * but on the CPU port.
 469                  */
 470                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 471                 break;
 472         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 473                 err = dsa_slave_vlan_del(dev, obj);
 474                 break;
 475         case SWITCHDEV_OBJ_ID_MRP:
 476                 if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 477                         return -EOPNOTSUPP;
 478                 err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 479                 break;
 480         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 481                 if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 482                         return -EOPNOTSUPP;
 483                 err = dsa_port_mrp_del_ring_role(dp,
 484                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 485                 break;
 486         default:
 487                 err = -EOPNOTSUPP;
 488                 break;
 489         }
 490
 491         return err;
 492 }
 493
 494 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 495                                         struct netdev_phys_item_id *ppid)
 496 {
 497         struct dsa_port *dp = dsa_slave_to_port(dev);
 498         struct dsa_switch *ds = dp->ds;
 499         struct dsa_switch_tree *dst = ds->dst;
 500
 501         /* For non-legacy ports, devlink is used and it takes
 502          * care of the name generation. This ndo implementation
 503          * should be removed with legacy support.
 504          */
 505         if (dp->ds->devlink)
 506                 return -EOPNOTSUPP;
 507
 508         ppid->id_len = sizeof(dst->index);
 509         memcpy(&ppid->id, &dst->index, ppid->id_len);
 510
 511         return 0;
 512 }
 513
 514 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 515                                                      struct sk_buff *skb)
 516 {
 517 #ifdef CONFIG_NET_POLL_CONTROLLER
 518         struct dsa_slave_priv *p = netdev_priv(dev);
 519
 520         return netpoll_send_skb(p->netpoll, skb);
 521 #else
 522         BUG();
 523         return NETDEV_TX_OK;
 524 #endif
 525 }
 526
 527 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 528                                  struct sk_buff *skb)
 529 {
 530         struct dsa_switch *ds = p->dp->ds;
 531         struct sk_buff *clone;
 532         unsigned int type;
 533
 534         type = ptp_classify_raw(skb);
 535         if (type == PTP_CLASS_NONE)
 536                 return;
 537
 538         if (!ds->ops->port_txtstamp)
 539                 return;
 540
 541         clone = skb_clone_sk(skb);
 542         if (!clone)
 543                 return;
 544
 545         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type)) {
 546                 DSA_SKB_CB(skb)->clone = clone;
 547                 return;
 548         }
 549
 550         kfree_skb(clone);
 551 }
 552
 553 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 554 {
 555         /* SKB for netpoll still need to be mangled with the protocol-specific
 556          * tag to be successfully transmitted
 557          */
 558         if (unlikely(netpoll_tx_running(dev)))
 559                 return dsa_slave_netpoll_send_skb(dev, skb);
 560
 561         /* Queue the SKB for transmission on the parent interface, but
 562          * do not modify its EtherType
 563          */
 564         skb->dev = dsa_slave_to_master(dev);
 565         dev_queue_xmit(skb);
 566
 567         return NETDEV_TX_OK;
 568 }
 569 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 570
 571 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 572 {
 573         int needed_headroom = dev->needed_headroom;
 574         int needed_tailroom = dev->needed_tailroom;
 575
 576         /* For tail taggers, we need to pad short frames ourselves, to ensure
 577          * that the tail tag does not fail at its role of being at the end of
 578          * the packet, once the master interface pads the frame. Account for
 579          * that pad length here, and pad later.
 580          */
 581         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 582                 needed_tailroom += ETH_ZLEN - skb->len;
 583         /* skb_headroom() returns unsigned int... */
 584         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 585         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 586
 587         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 588                 /* No reallocation needed, yay! */
 589                 return 0;
 590
 591         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 592                                 GFP_ATOMIC);
 593 }
 594
 595 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 596 {
 597         struct dsa_slave_priv *p = netdev_priv(dev);
 598         struct sk_buff *nskb;
 599
 600         dev_sw_netstats_tx_add(dev, 1, skb->len);
 601
 602         DSA_SKB_CB(skb)->clone = NULL;
 603
 604         /* Identify PTP protocol packets, clone them, and pass them to the
 605          * switch driver
 606          */
 607         dsa_skb_tx_timestamp(p, skb);
 608
 609         if (dsa_realloc_skb(skb, dev)) {
 610                 dev_kfree_skb_any(skb);
 611                 return NETDEV_TX_OK;
 612         }
 613
 614         /* needed_tailroom should still be 'warm' in the cache line from
 615          * dsa_realloc_skb(), which has also ensured that padding is safe.
 616          */
 617         if (dev->needed_tailroom)
 618                 eth_skb_pad(skb);
 619
 620         /* Transmit function may have to reallocate the original SKB,
 621          * in which case it must have freed it. Only free it here on error.
 622          */
 623         nskb = p->xmit(skb, dev);
 624         if (!nskb) {
 625                 kfree_skb(skb);
 626                 return NETDEV_TX_OK;
 627         }
 628
 629         return dsa_enqueue_skb(nskb, dev);
 630 }
 631
 632 /* ethtool operations *******************************************************/
 633
 634 static void dsa_slave_get_drvinfo(struct net_device *dev,
 635                                   struct ethtool_drvinfo *drvinfo)
 636 {
 637         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 638         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 639         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 640 }
 641
 642 static int dsa_slave_get_regs_len(struct net_device *dev)
 643 {
 644         struct dsa_port *dp = dsa_slave_to_port(dev);
 645         struct dsa_switch *ds = dp->ds;
 646
 647         if (ds->ops->get_regs_len)
 648                 return ds->ops->get_regs_len(ds, dp->index);
 649
 650         return -EOPNOTSUPP;
 651 }
 652
 653 static void
 654 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 655 {
 656         struct dsa_port *dp = dsa_slave_to_port(dev);
 657         struct dsa_switch *ds = dp->ds;
 658
 659         if (ds->ops->get_regs)
 660                 ds->ops->get_regs(ds, dp->index, regs, _p);
 661 }
 662
 663 static int dsa_slave_nway_reset(struct net_device *dev)
 664 {
 665         struct dsa_port *dp = dsa_slave_to_port(dev);
 666
 667         return phylink_ethtool_nway_reset(dp->pl);
 668 }
 669
 670 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 671 {
 672         struct dsa_port *dp = dsa_slave_to_port(dev);
 673         struct dsa_switch *ds = dp->ds;
 674
 675         if (ds->cd && ds->cd->eeprom_len)
 676                 return ds->cd->eeprom_len;
 677
 678         if (ds->ops->get_eeprom_len)
 679                 return ds->ops->get_eeprom_len(ds);
 680
 681         return 0;
 682 }
 683
 684 static int dsa_slave_get_eeprom(struct net_device *dev,
 685                                 struct ethtool_eeprom *eeprom, u8 *data)
 686 {
 687         struct dsa_port *dp = dsa_slave_to_port(dev);
 688         struct dsa_switch *ds = dp->ds;
 689
 690         if (ds->ops->get_eeprom)
 691                 return ds->ops->get_eeprom(ds, eeprom, data);
 692
 693         return -EOPNOTSUPP;
 694 }
 695
 696 static int dsa_slave_set_eeprom(struct net_device *dev,
 697                                 struct ethtool_eeprom *eeprom, u8 *data)
 698 {
 699         struct dsa_port *dp = dsa_slave_to_port(dev);
 700         struct dsa_switch *ds = dp->ds;
 701
 702         if (ds->ops->set_eeprom)
 703                 return ds->ops->set_eeprom(ds, eeprom, data);
 704
 705         return -EOPNOTSUPP;
 706 }
 707
 708 static void dsa_slave_get_strings(struct net_device *dev,
 709                                   uint32_t stringset, uint8_t *data)
 710 {
 711         struct dsa_port *dp = dsa_slave_to_port(dev);
 712         struct dsa_switch *ds = dp->ds;
 713
 714         if (stringset == ETH_SS_STATS) {
 715                 int len = ETH_GSTRING_LEN;
 716
 717                 strncpy(data, "tx_packets", len);
 718                 strncpy(data + len, "tx_bytes", len);
 719                 strncpy(data + 2 * len, "rx_packets", len);
 720                 strncpy(data + 3 * len, "rx_bytes", len);
 721                 if (ds->ops->get_strings)
 722                         ds->ops->get_strings(ds, dp->index, stringset,
 723                                              data + 4 * len);
 724         }
 725 }
 726
 727 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 728                                         struct ethtool_stats *stats,
 729                                         uint64_t *data)
 730 {
 731         struct dsa_port *dp = dsa_slave_to_port(dev);
 732         struct dsa_switch *ds = dp->ds;
 733         struct pcpu_sw_netstats *s;
 734         unsigned int start;
 735         int i;
 736
 737         for_each_possible_cpu(i) {
 738                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 739
 740                 s = per_cpu_ptr(dev->tstats, i);
 741                 do {
 742                         start = u64_stats_fetch_begin_irq(&s->syncp);
 743                         tx_packets = s->tx_packets;
 744                         tx_bytes = s->tx_bytes;
 745                         rx_packets = s->rx_packets;
 746                         rx_bytes = s->rx_bytes;
 747                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 748                 data[0] += tx_packets;
 749                 data[1] += tx_bytes;
 750                 data[2] += rx_packets;
 751                 data[3] += rx_bytes;
 752         }
 753         if (ds->ops->get_ethtool_stats)
 754                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 755 }
 756
 757 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 758 {
 759         struct dsa_port *dp = dsa_slave_to_port(dev);
 760         struct dsa_switch *ds = dp->ds;
 761
 762         if (sset == ETH_SS_STATS) {
 763                 int count;
 764
 765                 count = 4;
 766                 if (ds->ops->get_sset_count)
 767                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 768
 769                 return count;
 770         }
 771
 772         return -EOPNOTSUPP;
 773 }
 774
 775 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 776 {
 777         struct dsa_port *dp = dsa_slave_to_port(dev);
 778         struct dsa_switch *ds = dp->ds;
 779
 780         phylink_ethtool_get_wol(dp->pl, w);
 781
 782         if (ds->ops->get_wol)
 783                 ds->ops->get_wol(ds, dp->index, w);
 784 }
 785
 786 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 787 {
 788         struct dsa_port *dp = dsa_slave_to_port(dev);
 789         struct dsa_switch *ds = dp->ds;
 790         int ret = -EOPNOTSUPP;
 791
 792         phylink_ethtool_set_wol(dp->pl, w);
 793
 794         if (ds->ops->set_wol)
 795                 ret = ds->ops->set_wol(ds, dp->index, w);
 796
 797         return ret;
 798 }
 799
 800 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 801 {
 802         struct dsa_port *dp = dsa_slave_to_port(dev);
 803         struct dsa_switch *ds = dp->ds;
 804         int ret;
 805
 806         /* Port's PHY and MAC both need to be EEE capable */
 807         if (!dev->phydev || !dp->pl)
 808                 return -ENODEV;
 809
 810         if (!ds->ops->set_mac_eee)
 811                 return -EOPNOTSUPP;
 812
 813         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 814         if (ret)
 815                 return ret;
 816
 817         return phylink_ethtool_set_eee(dp->pl, e);
 818 }
 819
 820 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 821 {
 822         struct dsa_port *dp = dsa_slave_to_port(dev);
 823         struct dsa_switch *ds = dp->ds;
 824         int ret;
 825
 826         /* Port's PHY and MAC both need to be EEE capable */
 827         if (!dev->phydev || !dp->pl)
 828                 return -ENODEV;
 829
 830         if (!ds->ops->get_mac_eee)
 831                 return -EOPNOTSUPP;
 832
 833         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 834         if (ret)
 835                 return ret;
 836
 837         return phylink_ethtool_get_eee(dp->pl, e);
 838 }
 839
 840 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 841                                         struct ethtool_link_ksettings *cmd)
 842 {
 843         struct dsa_port *dp = dsa_slave_to_port(dev);
 844
 845         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 846 }
 847
 848 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 849                                         const struct ethtool_link_ksettings *cmd)
 850 {
 851         struct dsa_port *dp = dsa_slave_to_port(dev);
 852
 853         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 854 }
 855
 856 static void dsa_slave_get_pauseparam(struct net_device *dev,
 857                                      struct ethtool_pauseparam *pause)
 858 {
 859         struct dsa_port *dp = dsa_slave_to_port(dev);
 860
 861         phylink_ethtool_get_pauseparam(dp->pl, pause);
 862 }
 863
 864 static int dsa_slave_set_pauseparam(struct net_device *dev,
 865                                     struct ethtool_pauseparam *pause)
 866 {
 867         struct dsa_port *dp = dsa_slave_to_port(dev);
 868
 869         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 870 }
 871
 872 #ifdef CONFIG_NET_POLL_CONTROLLER
 873 static int dsa_slave_netpoll_setup(struct net_device *dev,
 874                                    struct netpoll_info *ni)
 875 {
 876         struct net_device *master = dsa_slave_to_master(dev);
 877         struct dsa_slave_priv *p = netdev_priv(dev);
 878         struct netpoll *netpoll;
 879         int err = 0;
 880
 881         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 882         if (!netpoll)
 883                 return -ENOMEM;
 884
 885         err = __netpoll_setup(netpoll, master);
 886         if (err) {
 887                 kfree(netpoll);
 888                 goto out;
 889         }
 890
 891         p->netpoll = netpoll;
 892 out:
 893         return err;
 894 }
 895
 896 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 897 {
 898         struct dsa_slave_priv *p = netdev_priv(dev);
 899         struct netpoll *netpoll = p->netpoll;
 900
 901         if (!netpoll)
 902                 return;
 903
 904         p->netpoll = NULL;
 905
 906         __netpoll_free(netpoll);
 907 }
 908
 909 static void dsa_slave_poll_controller(struct net_device *dev)
 910 {
 911 }
 912 #endif
 913
 914 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 915                                         char *name, size_t len)
 916 {
 917         struct dsa_port *dp = dsa_slave_to_port(dev);
 918
 919         /* For non-legacy ports, devlink is used and it takes
 920          * care of the name generation. This ndo implementation
 921          * should be removed with legacy support.
 922          */
 923         if (dp->ds->devlink)
 924                 return -EOPNOTSUPP;
 925
 926         if (snprintf(name, len, "p%d", dp->index) >= len)
 927                 return -EINVAL;
 928
 929         return 0;
 930 }
 931
 932 static struct dsa_mall_tc_entry *
 933 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 934 {
 935         struct dsa_slave_priv *p = netdev_priv(dev);
 936         struct dsa_mall_tc_entry *mall_tc_entry;
 937
 938         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 939                 if (mall_tc_entry->cookie == cookie)
 940                         return mall_tc_entry;
 941
 942         return NULL;
 943 }
 944
 945 static int
 946 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 947                                   struct tc_cls_matchall_offload *cls,
 948                                   bool ingress)
 949 {
 950         struct dsa_port *dp = dsa_slave_to_port(dev);
 951         struct dsa_slave_priv *p = netdev_priv(dev);
 952         struct dsa_mall_mirror_tc_entry *mirror;
 953         struct dsa_mall_tc_entry *mall_tc_entry;
 954         struct dsa_switch *ds = dp->ds;
 955         struct flow_action_entry *act;
 956         struct dsa_port *to_dp;
 957         int err;
 958
 959         if (!ds->ops->port_mirror_add)
 960                 return -EOPNOTSUPP;
 961
 962         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 963                                               cls->common.extack))
 964                 return -EOPNOTSUPP;
 965
 966         act = &cls->rule->action.entries[0];
 967
 968         if (!act->dev)
 969                 return -EINVAL;
 970
 971         if (!dsa_slave_dev_check(act->dev))
 972                 return -EOPNOTSUPP;
 973
 974         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 975         if (!mall_tc_entry)
 976                 return -ENOMEM;
 977
 978         mall_tc_entry->cookie = cls->cookie;
 979         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 980         mirror = &mall_tc_entry->mirror;
 981
 982         to_dp = dsa_slave_to_port(act->dev);
 983
 984         mirror->to_local_port = to_dp->index;
 985         mirror->ingress = ingress;
 986
 987         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 988         if (err) {
 989                 kfree(mall_tc_entry);
 990                 return err;
 991         }
 992
 993         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 994
 995         return err;
 996 }
 997
 998 static int
 999 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1000                                   struct tc_cls_matchall_offload *cls,
1001                                   bool ingress)
1002 {
1003         struct netlink_ext_ack *extack = cls->common.extack;
1004         struct dsa_port *dp = dsa_slave_to_port(dev);
1005         struct dsa_slave_priv *p = netdev_priv(dev);
1006         struct dsa_mall_policer_tc_entry *policer;
1007         struct dsa_mall_tc_entry *mall_tc_entry;
1008         struct dsa_switch *ds = dp->ds;
1009         struct flow_action_entry *act;
1010         int err;
1011
1012         if (!ds->ops->port_policer_add) {
1013                 NL_SET_ERR_MSG_MOD(extack,
1014                                    "Policing offload not implemented");
1015                 return -EOPNOTSUPP;
1016         }
1017
1018         if (!ingress) {
1019                 NL_SET_ERR_MSG_MOD(extack,
1020                                    "Only supported on ingress qdisc");
1021                 return -EOPNOTSUPP;
1022         }
1023
1024         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1025                                               cls->common.extack))
1026                 return -EOPNOTSUPP;
1027
1028         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1029                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1030                         NL_SET_ERR_MSG_MOD(extack,
1031                                            "Only one port policer allowed");
1032                         return -EEXIST;
1033                 }
1034         }
1035
1036         act = &cls->rule->action.entries[0];
1037
1038         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1039         if (!mall_tc_entry)
1040                 return -ENOMEM;
1041
1042         mall_tc_entry->cookie = cls->cookie;
1043         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1044         policer = &mall_tc_entry->policer;
1045         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1046         policer->burst = act->police.burst;
1047
1048         err = ds->ops->port_policer_add(ds, dp->index, policer);
1049         if (err) {
1050                 kfree(mall_tc_entry);
1051                 return err;
1052         }
1053
1054         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1055
1056         return err;
1057 }
1058
1059 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1060                                       struct tc_cls_matchall_offload *cls,
1061                                       bool ingress)
1062 {
1063         int err = -EOPNOTSUPP;
1064
1065         if (cls->common.protocol == htons(ETH_P_ALL) &&
1066             flow_offload_has_one_action(&cls->rule->action) &&
1067             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1068                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1069         else if (flow_offload_has_one_action(&cls->rule->action) &&
1070                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1071                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1072
1073         return err;
1074 }
1075
1076 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1077                                        struct tc_cls_matchall_offload *cls)
1078 {
1079         struct dsa_port *dp = dsa_slave_to_port(dev);
1080         struct dsa_mall_tc_entry *mall_tc_entry;
1081         struct dsa_switch *ds = dp->ds;
1082
1083         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1084         if (!mall_tc_entry)
1085                 return;
1086
1087         list_del(&mall_tc_entry->list);
1088
1089         switch (mall_tc_entry->type) {
1090         case DSA_PORT_MALL_MIRROR:
1091                 if (ds->ops->port_mirror_del)
1092                         ds->ops->port_mirror_del(ds, dp->index,
1093                                                  &mall_tc_entry->mirror);
1094                 break;
1095         case DSA_PORT_MALL_POLICER:
1096                 if (ds->ops->port_policer_del)
1097                         ds->ops->port_policer_del(ds, dp->index);
1098                 break;
1099         default:
1100                 WARN_ON(1);
1101         }
1102
1103         kfree(mall_tc_entry);
1104 }
1105
1106 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1107                                            struct tc_cls_matchall_offload *cls,
1108                                            bool ingress)
1109 {
1110         if (cls->common.chain_index)
1111                 return -EOPNOTSUPP;
1112
1113         switch (cls->command) {
1114         case TC_CLSMATCHALL_REPLACE:
1115                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1116         case TC_CLSMATCHALL_DESTROY:
1117                 dsa_slave_del_cls_matchall(dev, cls);
1118                 return 0;
1119         default:
1120                 return -EOPNOTSUPP;
1121         }
1122 }
1123
1124 static int dsa_slave_add_cls_flower(struct net_device *dev,
1125                                     struct flow_cls_offload *cls,
1126                                     bool ingress)
1127 {
1128         struct dsa_port *dp = dsa_slave_to_port(dev);
1129         struct dsa_switch *ds = dp->ds;
1130         int port = dp->index;
1131
1132         if (!ds->ops->cls_flower_add)
1133                 return -EOPNOTSUPP;
1134
1135         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1136 }
1137
1138 static int dsa_slave_del_cls_flower(struct net_device *dev,
1139                                     struct flow_cls_offload *cls,
1140                                     bool ingress)
1141 {
1142         struct dsa_port *dp = dsa_slave_to_port(dev);
1143         struct dsa_switch *ds = dp->ds;
1144         int port = dp->index;
1145
1146         if (!ds->ops->cls_flower_del)
1147                 return -EOPNOTSUPP;
1148
1149         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1150 }
1151
1152 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1153                                       struct flow_cls_offload *cls,
1154                                       bool ingress)
1155 {
1156         struct dsa_port *dp = dsa_slave_to_port(dev);
1157         struct dsa_switch *ds = dp->ds;
1158         int port = dp->index;
1159
1160         if (!ds->ops->cls_flower_stats)
1161                 return -EOPNOTSUPP;
1162
1163         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1164 }
1165
1166 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1167                                          struct flow_cls_offload *cls,
1168                                          bool ingress)
1169 {
1170         switch (cls->command) {
1171         case FLOW_CLS_REPLACE:
1172                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1173         case FLOW_CLS_DESTROY:
1174                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1175         case FLOW_CLS_STATS:
1176                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1177         default:
1178                 return -EOPNOTSUPP;
1179         }
1180 }
1181
1182 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1183                                        void *cb_priv, bool ingress)
1184 {
1185         struct net_device *dev = cb_priv;
1186
1187         if (!tc_can_offload(dev))
1188                 return -EOPNOTSUPP;
1189
1190         switch (type) {
1191         case TC_SETUP_CLSMATCHALL:
1192                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1193         case TC_SETUP_CLSFLOWER:
1194                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1195         default:
1196                 return -EOPNOTSUPP;
1197         }
1198 }
1199
1200 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1201                                           void *type_data, void *cb_priv)
1202 {
1203         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1204 }
1205
1206 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1207                                           void *type_data, void *cb_priv)
1208 {
1209         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1210 }
1211
1212 static LIST_HEAD(dsa_slave_block_cb_list);
1213
1214 static int dsa_slave_setup_tc_block(struct net_device *dev,
1215                                     struct flow_block_offload *f)
1216 {
1217         struct flow_block_cb *block_cb;
1218         flow_setup_cb_t *cb;
1219
1220         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1221                 cb = dsa_slave_setup_tc_block_cb_ig;
1222         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1223                 cb = dsa_slave_setup_tc_block_cb_eg;
1224         else
1225                 return -EOPNOTSUPP;
1226
1227         f->driver_block_list = &dsa_slave_block_cb_list;
1228
1229         switch (f->command) {
1230         case FLOW_BLOCK_BIND:
1231                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1232                         return -EBUSY;
1233
1234                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1235                 if (IS_ERR(block_cb))
1236                         return PTR_ERR(block_cb);
1237
1238                 flow_block_cb_add(block_cb, f);
1239                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1240                 return 0;
1241         case FLOW_BLOCK_UNBIND:
1242                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1243                 if (!block_cb)
1244                         return -ENOENT;
1245
1246                 flow_block_cb_remove(block_cb, f);
1247                 list_del(&block_cb->driver_list);
1248                 return 0;
1249         default:
1250                 return -EOPNOTSUPP;
1251         }
1252 }
1253
1254 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1255                               void *type_data)
1256 {
1257         struct dsa_port *dp = dsa_slave_to_port(dev);
1258         struct dsa_switch *ds = dp->ds;
1259
1260         if (type == TC_SETUP_BLOCK)
1261                 return dsa_slave_setup_tc_block(dev, type_data);
1262
1263         if (!ds->ops->port_setup_tc)
1264                 return -EOPNOTSUPP;
1265
1266         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1267 }
1268
1269 static int dsa_slave_get_rxnfc(struct net_device *dev,
1270                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1271 {
1272         struct dsa_port *dp = dsa_slave_to_port(dev);
1273         struct dsa_switch *ds = dp->ds;
1274
1275         if (!ds->ops->get_rxnfc)
1276                 return -EOPNOTSUPP;
1277
1278         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1279 }
1280
1281 static int dsa_slave_set_rxnfc(struct net_device *dev,
1282                                struct ethtool_rxnfc *nfc)
1283 {
1284         struct dsa_port *dp = dsa_slave_to_port(dev);
1285         struct dsa_switch *ds = dp->ds;
1286
1287         if (!ds->ops->set_rxnfc)
1288                 return -EOPNOTSUPP;
1289
1290         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1291 }
1292
1293 static int dsa_slave_get_ts_info(struct net_device *dev,
1294                                  struct ethtool_ts_info *ts)
1295 {
1296         struct dsa_slave_priv *p = netdev_priv(dev);
1297         struct dsa_switch *ds = p->dp->ds;
1298
1299         if (!ds->ops->get_ts_info)
1300                 return -EOPNOTSUPP;
1301
1302         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1303 }
1304
1305 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1306                                      u16 vid)
1307 {
1308         struct net_device *master = dsa_slave_to_master(dev);
1309         struct dsa_port *dp = dsa_slave_to_port(dev);
1310         struct switchdev_obj_port_vlan vlan = {
1311                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1312                 .vid = vid,
1313                 /* This API only allows programming tagged, non-PVID VIDs */
1314                 .flags = 0,
1315         };
1316         struct netlink_ext_ack extack = {0};
1317         int ret;
1318
1319         /* User port... */
1320         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1321         if (ret) {
1322                 if (extack._msg)
1323                         netdev_err(dev, "%s\n", extack._msg);
1324                 return ret;
1325         }
1326
1327         /* And CPU port... */
1328         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &extack);
1329         if (ret) {
1330                 if (extack._msg)
1331                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1332                                    extack._msg);
1333                 return ret;
1334         }
1335
1336         return vlan_vid_add(master, proto, vid);
1337 }
1338
1339 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1340                                       u16 vid)
1341 {
1342         struct net_device *master = dsa_slave_to_master(dev);
1343         struct dsa_port *dp = dsa_slave_to_port(dev);
1344         struct switchdev_obj_port_vlan vlan = {
1345                 .vid = vid,
1346                 /* This API only allows programming tagged, non-PVID VIDs */
1347                 .flags = 0,
1348         };
1349         int err;
1350
1351         /* Do not deprogram the CPU port as it may be shared with other user
1352          * ports which can be members of this VLAN as well.
1353          */
1354         err = dsa_port_vlan_del(dp, &vlan);
1355         if (err)
1356                 return err;
1357
1358         vlan_vid_del(master, proto, vid);
1359
1360         return 0;
1361 }
1362
1363 struct dsa_hw_port {
1364         struct list_head list;
1365         struct net_device *dev;
1366         int old_mtu;
1367 };
1368
1369 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1370 {
1371         const struct dsa_hw_port *p;
1372         int err;
1373
1374         list_for_each_entry(p, hw_port_list, list) {
1375                 if (p->dev->mtu == mtu)
1376                         continue;
1377
1378                 err = dev_set_mtu(p->dev, mtu);
1379                 if (err)
1380                         goto rollback;
1381         }
1382
1383         return 0;
1384
1385 rollback:
1386         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1387                 if (p->dev->mtu == p->old_mtu)
1388                         continue;
1389
1390                 if (dev_set_mtu(p->dev, p->old_mtu))
1391                         netdev_err(p->dev, "Failed to restore MTU\n");
1392         }
1393
1394         return err;
1395 }
1396
1397 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1398 {
1399         struct dsa_hw_port *p, *n;
1400
1401         list_for_each_entry_safe(p, n, hw_port_list, list)
1402                 kfree(p);
1403 }
1404
1405 /* Make the hardware datapath to/from @dev limited to a common MTU */
1406 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1407 {
1408         struct list_head hw_port_list;
1409         struct dsa_switch_tree *dst;
1410         int min_mtu = ETH_MAX_MTU;
1411         struct dsa_port *other_dp;
1412         int err;
1413
1414         if (!dp->ds->mtu_enforcement_ingress)
1415                 return;
1416
1417         if (!dp->bridge_dev)
1418                 return;
1419
1420         INIT_LIST_HEAD(&hw_port_list);
1421
1422         /* Populate the list of ports that are part of the same bridge
1423          * as the newly added/modified port
1424          */
1425         list_for_each_entry(dst, &dsa_tree_list, list) {
1426                 list_for_each_entry(other_dp, &dst->ports, list) {
1427                         struct dsa_hw_port *hw_port;
1428                         struct net_device *slave;
1429
1430                         if (other_dp->type != DSA_PORT_TYPE_USER)
1431                                 continue;
1432
1433                         if (other_dp->bridge_dev != dp->bridge_dev)
1434                                 continue;
1435
1436                         if (!other_dp->ds->mtu_enforcement_ingress)
1437                                 continue;
1438
1439                         slave = other_dp->slave;
1440
1441                         if (min_mtu > slave->mtu)
1442                                 min_mtu = slave->mtu;
1443
1444                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1445                         if (!hw_port)
1446                                 goto out;
1447
1448                         hw_port->dev = slave;
1449                         hw_port->old_mtu = slave->mtu;
1450
1451                         list_add(&hw_port->list, &hw_port_list);
1452                 }
1453         }
1454
1455         /* Attempt to configure the entire hardware bridge to the newly added
1456          * interface's MTU first, regardless of whether the intention of the
1457          * user was to raise or lower it.
1458          */
1459         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1460         if (!err)
1461                 goto out;
1462
1463         /* Clearly that didn't work out so well, so just set the minimum MTU on
1464          * all hardware bridge ports now. If this fails too, then all ports will
1465          * still have their old MTU rolled back anyway.
1466          */
1467         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1468
1469 out:
1470         dsa_hw_port_list_free(&hw_port_list);
1471 }
1472
1473 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1474 {
1475         struct net_device *master = dsa_slave_to_master(dev);
1476         struct dsa_port *dp = dsa_slave_to_port(dev);
1477         struct dsa_slave_priv *p = netdev_priv(dev);
1478         struct dsa_switch *ds = p->dp->ds;
1479         struct dsa_port *cpu_dp;
1480         int port = p->dp->index;
1481         int largest_mtu = 0;
1482         int new_master_mtu;
1483         int old_master_mtu;
1484         int mtu_limit;
1485         int cpu_mtu;
1486         int err, i;
1487
1488         if (!ds->ops->port_change_mtu)
1489                 return -EOPNOTSUPP;
1490
1491         for (i = 0; i < ds->num_ports; i++) {
1492                 int slave_mtu;
1493
1494                 if (!dsa_is_user_port(ds, i))
1495                         continue;
1496
1497                 /* During probe, this function will be called for each slave
1498                  * device, while not all of them have been allocated. That's
1499                  * ok, it doesn't change what the maximum is, so ignore it.
1500                  */
1501                 if (!dsa_to_port(ds, i)->slave)
1502                         continue;
1503
1504                 /* Pretend that we already applied the setting, which we
1505                  * actually haven't (still haven't done all integrity checks)
1506                  */
1507                 if (i == port)
1508                         slave_mtu = new_mtu;
1509                 else
1510                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1511
1512                 if (largest_mtu < slave_mtu)
1513                         largest_mtu = slave_mtu;
1514         }
1515
1516         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1517
1518         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1519         old_master_mtu = master->mtu;
1520         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1521         if (new_master_mtu > mtu_limit)
1522                 return -ERANGE;
1523
1524         /* If the master MTU isn't over limit, there's no need to check the CPU
1525          * MTU, since that surely isn't either.
1526          */
1527         cpu_mtu = largest_mtu;
1528
1529         /* Start applying stuff */
1530         if (new_master_mtu != old_master_mtu) {
1531                 err = dev_set_mtu(master, new_master_mtu);
1532                 if (err < 0)
1533                         goto out_master_failed;
1534
1535                 /* We only need to propagate the MTU of the CPU port to
1536                  * upstream switches.
1537                  */
1538                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1539                 if (err)
1540                         goto out_cpu_failed;
1541         }
1542
1543         err = dsa_port_mtu_change(dp, new_mtu, false);
1544         if (err)
1545                 goto out_port_failed;
1546
1547         dev->mtu = new_mtu;
1548
1549         dsa_bridge_mtu_normalization(dp);
1550
1551         return 0;
1552
1553 out_port_failed:
1554         if (new_master_mtu != old_master_mtu)
1555                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1556                                     cpu_dp->tag_ops->overhead,
1557                                     true);
1558 out_cpu_failed:
1559         if (new_master_mtu != old_master_mtu)
1560                 dev_set_mtu(master, old_master_mtu);
1561 out_master_failed:
1562         return err;
1563 }
1564
1565 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1566         .get_drvinfo            = dsa_slave_get_drvinfo,
1567         .get_regs_len           = dsa_slave_get_regs_len,
1568         .get_regs               = dsa_slave_get_regs,
1569         .nway_reset             = dsa_slave_nway_reset,
1570         .get_link               = ethtool_op_get_link,
1571         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1572         .get_eeprom             = dsa_slave_get_eeprom,
1573         .set_eeprom             = dsa_slave_set_eeprom,
1574         .get_strings            = dsa_slave_get_strings,
1575         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1576         .get_sset_count         = dsa_slave_get_sset_count,
1577         .set_wol                = dsa_slave_set_wol,
1578         .get_wol                = dsa_slave_get_wol,
1579         .set_eee                = dsa_slave_set_eee,
1580         .get_eee                = dsa_slave_get_eee,
1581         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1582         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1583         .get_pauseparam         = dsa_slave_get_pauseparam,
1584         .set_pauseparam         = dsa_slave_set_pauseparam,
1585         .get_rxnfc              = dsa_slave_get_rxnfc,
1586         .set_rxnfc              = dsa_slave_set_rxnfc,
1587         .get_ts_info            = dsa_slave_get_ts_info,
1588 };
1589
1590 /* legacy way, bypassing the bridge *****************************************/
1591 static int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1592                               struct net_device *dev,
1593                               const unsigned char *addr, u16 vid,
1594                               u16 flags,
1595                               struct netlink_ext_ack *extack)
1596 {
1597         struct dsa_port *dp = dsa_slave_to_port(dev);
1598
1599         return dsa_port_fdb_add(dp, addr, vid);
1600 }
1601
1602 static int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1603                               struct net_device *dev,
1604                               const unsigned char *addr, u16 vid)
1605 {
1606         struct dsa_port *dp = dsa_slave_to_port(dev);
1607
1608         return dsa_port_fdb_del(dp, addr, vid);
1609 }
1610
1611 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1612 {
1613         struct dsa_port *dp = dsa_slave_to_port(dev);
1614
1615         return dp->ds->devlink ? &dp->devlink_port : NULL;
1616 }
1617
1618 static void dsa_slave_get_stats64(struct net_device *dev,
1619                                   struct rtnl_link_stats64 *s)
1620 {
1621         struct dsa_port *dp = dsa_slave_to_port(dev);
1622         struct dsa_switch *ds = dp->ds;
1623
1624         if (ds->ops->get_stats64)
1625                 ds->ops->get_stats64(ds, dp->index, s);
1626         else
1627                 dev_get_tstats64(dev, s);
1628 }
1629
1630 static const struct net_device_ops dsa_slave_netdev_ops = {
1631         .ndo_open               = dsa_slave_open,
1632         .ndo_stop               = dsa_slave_close,
1633         .ndo_start_xmit         = dsa_slave_xmit,
1634         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1635         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1636         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1637         .ndo_fdb_add            = dsa_legacy_fdb_add,
1638         .ndo_fdb_del            = dsa_legacy_fdb_del,
1639         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1640         .ndo_do_ioctl           = dsa_slave_ioctl,
1641         .ndo_get_iflink         = dsa_slave_get_iflink,
1642 #ifdef CONFIG_NET_POLL_CONTROLLER
1643         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1644         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1645         .ndo_poll_controller    = dsa_slave_poll_controller,
1646 #endif
1647         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1648         .ndo_setup_tc           = dsa_slave_setup_tc,
1649         .ndo_get_stats64        = dsa_slave_get_stats64,
1650         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1651         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1652         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1653         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1654         .ndo_change_mtu         = dsa_slave_change_mtu,
1655 };
1656
1657 static struct device_type dsa_type = {
1658         .name   = "dsa",
1659 };
1660
1661 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1662 {
1663         const struct dsa_port *dp = dsa_to_port(ds, port);
1664
1665         if (dp->pl)
1666                 phylink_mac_change(dp->pl, up);
1667 }
1668 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1669
1670 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1671                                           struct phylink_link_state *state)
1672 {
1673         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1674         struct dsa_switch *ds = dp->ds;
1675
1676         /* No need to check that this operation is valid, the callback would
1677          * not be called if it was not.
1678          */
1679         ds->ops->phylink_fixed_state(ds, dp->index, state);
1680 }
1681
1682 /* slave device setup *******************************************************/
1683 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1684 {
1685         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1686         struct dsa_switch *ds = dp->ds;
1687
1688         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1689         if (!slave_dev->phydev) {
1690                 netdev_err(slave_dev, "no phy at %d\n", addr);
1691                 return -ENODEV;
1692         }
1693
1694         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1695 }
1696
1697 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1698 {
1699         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1700         struct device_node *port_dn = dp->dn;
1701         struct dsa_switch *ds = dp->ds;
1702         phy_interface_t mode;
1703         u32 phy_flags = 0;
1704         int ret;
1705
1706         ret = of_get_phy_mode(port_dn, &mode);
1707         if (ret)
1708                 mode = PHY_INTERFACE_MODE_NA;
1709
1710         dp->pl_config.dev = &slave_dev->dev;
1711         dp->pl_config.type = PHYLINK_NETDEV;
1712
1713         /* The get_fixed_state callback takes precedence over polling the
1714          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1715          * this if the switch provides such a callback.
1716          */
1717         if (ds->ops->phylink_fixed_state) {
1718                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1719                 dp->pl_config.poll_fixed_state = true;
1720         }
1721
1722         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1723                                 &dsa_port_phylink_mac_ops);
1724         if (IS_ERR(dp->pl)) {
1725                 netdev_err(slave_dev,
1726                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1727                 return PTR_ERR(dp->pl);
1728         }
1729
1730         if (ds->ops->get_phy_flags)
1731                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1732
1733         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1734         if (ret == -ENODEV && ds->slave_mii_bus) {
1735                 /* We could not connect to a designated PHY or SFP, so try to
1736                  * use the switch internal MDIO bus instead
1737                  */
1738                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1739                 if (ret) {
1740                         netdev_err(slave_dev,
1741                                    "failed to connect to port %d: %d\n",
1742                                    dp->index, ret);
1743                         phylink_destroy(dp->pl);
1744                         return ret;
1745                 }
1746         }
1747
1748         return ret;
1749 }
1750
1751 void dsa_slave_setup_tagger(struct net_device *slave)
1752 {
1753         struct dsa_port *dp = dsa_slave_to_port(slave);
1754         struct dsa_slave_priv *p = netdev_priv(slave);
1755         const struct dsa_port *cpu_dp = dp->cpu_dp;
1756         struct net_device *master = cpu_dp->master;
1757
1758         if (cpu_dp->tag_ops->tail_tag)
1759                 slave->needed_tailroom = cpu_dp->tag_ops->overhead;
1760         else
1761                 slave->needed_headroom = cpu_dp->tag_ops->overhead;
1762         /* Try to save one extra realloc later in the TX path (in the master)
1763          * by also inheriting the master's needed headroom and tailroom.
1764          * The 8021q driver also does this.
1765          */
1766         slave->needed_headroom += master->needed_headroom;
1767         slave->needed_tailroom += master->needed_tailroom;
1768
1769         p->xmit = cpu_dp->tag_ops->xmit;
1770 }
1771
1772 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1773 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1774                                             struct netdev_queue *txq,
1775                                             void *_unused)
1776 {
1777         lockdep_set_class(&txq->_xmit_lock,
1778                           &dsa_slave_netdev_xmit_lock_key);
1779 }
1780
1781 int dsa_slave_suspend(struct net_device *slave_dev)
1782 {
1783         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1784
1785         if (!netif_running(slave_dev))
1786                 return 0;
1787
1788         netif_device_detach(slave_dev);
1789
1790         rtnl_lock();
1791         phylink_stop(dp->pl);
1792         rtnl_unlock();
1793
1794         return 0;
1795 }
1796
1797 int dsa_slave_resume(struct net_device *slave_dev)
1798 {
1799         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1800
1801         if (!netif_running(slave_dev))
1802                 return 0;
1803
1804         netif_device_attach(slave_dev);
1805
1806         rtnl_lock();
1807         phylink_start(dp->pl);
1808         rtnl_unlock();
1809
1810         return 0;
1811 }
1812
1813 int dsa_slave_create(struct dsa_port *port)
1814 {
1815         const struct dsa_port *cpu_dp = port->cpu_dp;
1816         struct net_device *master = cpu_dp->master;
1817         struct dsa_switch *ds = port->ds;
1818         const char *name = port->name;
1819         struct net_device *slave_dev;
1820         struct dsa_slave_priv *p;
1821         int ret;
1822
1823         if (!ds->num_tx_queues)
1824                 ds->num_tx_queues = 1;
1825
1826         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1827                                      NET_NAME_UNKNOWN, ether_setup,
1828                                      ds->num_tx_queues, 1);
1829         if (slave_dev == NULL)
1830                 return -ENOMEM;
1831
1832         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1833         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1834                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1835         slave_dev->hw_features |= NETIF_F_HW_TC;
1836         slave_dev->features |= NETIF_F_LLTX;
1837         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1838         if (!IS_ERR_OR_NULL(port->mac))
1839                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1840         else
1841                 eth_hw_addr_inherit(slave_dev, master);
1842         slave_dev->priv_flags |= IFF_NO_QUEUE;
1843         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1844         if (ds->ops->port_max_mtu)
1845                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1846         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1847
1848         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1849                                  NULL);
1850
1851         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1852         slave_dev->dev.of_node = port->dn;
1853         slave_dev->vlan_features = master->vlan_features;
1854
1855         p = netdev_priv(slave_dev);
1856         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1857         if (!slave_dev->tstats) {
1858                 free_netdev(slave_dev);
1859                 return -ENOMEM;
1860         }
1861
1862         ret = gro_cells_init(&p->gcells, slave_dev);
1863         if (ret)
1864                 goto out_free;
1865
1866         p->dp = port;
1867         INIT_LIST_HEAD(&p->mall_tc_list);
1868         port->slave = slave_dev;
1869         dsa_slave_setup_tagger(slave_dev);
1870
1871         rtnl_lock();
1872         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1873         rtnl_unlock();
1874         if (ret && ret != -EOPNOTSUPP)
1875                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1876                          ret, ETH_DATA_LEN, port->index);
1877
1878         netif_carrier_off(slave_dev);
1879
1880         ret = dsa_slave_phy_setup(slave_dev);
1881         if (ret) {
1882                 netdev_err(slave_dev,
1883                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1884                            ret, ds->dst->index, ds->index, port->index);
1885                 goto out_gcells;
1886         }
1887
1888         rtnl_lock();
1889
1890         ret = register_netdevice(slave_dev);
1891         if (ret) {
1892                 netdev_err(master, "error %d registering interface %s\n",
1893                            ret, slave_dev->name);
1894                 rtnl_unlock();
1895                 goto out_phy;
1896         }
1897
1898         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1899
1900         rtnl_unlock();
1901
1902         if (ret)
1903                 goto out_unregister;
1904
1905         return 0;
1906
1907 out_unregister:
1908         unregister_netdev(slave_dev);
1909 out_phy:
1910         rtnl_lock();
1911         phylink_disconnect_phy(p->dp->pl);
1912         rtnl_unlock();
1913         phylink_destroy(p->dp->pl);
1914 out_gcells:
1915         gro_cells_destroy(&p->gcells);
1916 out_free:
1917         free_percpu(slave_dev->tstats);
1918         free_netdev(slave_dev);
1919         port->slave = NULL;
1920         return ret;
1921 }
1922
1923 void dsa_slave_destroy(struct net_device *slave_dev)
1924 {
1925         struct net_device *master = dsa_slave_to_master(slave_dev);
1926         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1927         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1928
1929         netif_carrier_off(slave_dev);
1930         rtnl_lock();
1931         netdev_upper_dev_unlink(master, slave_dev);
1932         unregister_netdevice(slave_dev);
1933         phylink_disconnect_phy(dp->pl);
1934         rtnl_unlock();
1935
1936         phylink_destroy(dp->pl);
1937         gro_cells_destroy(&p->gcells);
1938         free_percpu(slave_dev->tstats);
1939         free_netdev(slave_dev);
1940 }
1941
1942 bool dsa_slave_dev_check(const struct net_device *dev)
1943 {
1944         return dev->netdev_ops == &dsa_slave_netdev_ops;
1945 }
1946 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
1947
1948 static int dsa_slave_changeupper(struct net_device *dev,
1949                                  struct netdev_notifier_changeupper_info *info)
1950 {
1951         struct dsa_port *dp = dsa_slave_to_port(dev);
1952         int err = NOTIFY_DONE;
1953
1954         if (netif_is_bridge_master(info->upper_dev)) {
1955                 if (info->linking) {
1956                         err = dsa_port_bridge_join(dp, info->upper_dev);
1957                         if (!err)
1958                                 dsa_bridge_mtu_normalization(dp);
1959                         err = notifier_from_errno(err);
1960                 } else {
1961                         dsa_port_bridge_leave(dp, info->upper_dev);
1962                         err = NOTIFY_OK;
1963                 }
1964         } else if (netif_is_lag_master(info->upper_dev)) {
1965                 if (info->linking) {
1966                         err = dsa_port_lag_join(dp, info->upper_dev,
1967                                                 info->upper_info);
1968                         if (err == -EOPNOTSUPP) {
1969                                 NL_SET_ERR_MSG_MOD(info->info.extack,
1970                                                    "Offloading not supported");
1971                                 err = 0;
1972                         }
1973                         err = notifier_from_errno(err);
1974                 } else {
1975                         dsa_port_lag_leave(dp, info->upper_dev);
1976                         err = NOTIFY_OK;
1977                 }
1978         } else if (is_hsr_master(info->upper_dev)) {
1979                 if (info->linking) {
1980                         err = dsa_port_hsr_join(dp, info->upper_dev);
1981                         if (err == -EOPNOTSUPP) {
1982                                 NL_SET_ERR_MSG_MOD(info->info.extack,
1983                                                    "Offloading not supported");
1984                                 err = 0;
1985                         }
1986                         err = notifier_from_errno(err);
1987                 } else {
1988                         dsa_port_hsr_leave(dp, info->upper_dev);
1989                         err = NOTIFY_OK;
1990                 }
1991         }
1992
1993         return err;
1994 }
1995
1996 static int
1997 dsa_slave_lag_changeupper(struct net_device *dev,
1998                           struct netdev_notifier_changeupper_info *info)
1999 {
2000         struct net_device *lower;
2001         struct list_head *iter;
2002         int err = NOTIFY_DONE;
2003         struct dsa_port *dp;
2004
2005         netdev_for_each_lower_dev(dev, lower, iter) {
2006                 if (!dsa_slave_dev_check(lower))
2007                         continue;
2008
2009                 dp = dsa_slave_to_port(lower);
2010                 if (!dp->lag_dev)
2011                         /* Software LAG */
2012                         continue;
2013
2014                 err = dsa_slave_changeupper(lower, info);
2015                 if (notifier_to_errno(err))
2016                         break;
2017         }
2018
2019         return err;
2020 }
2021
2022 static int
2023 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2024                                  struct netdev_notifier_changeupper_info *info)
2025 {
2026         struct netlink_ext_ack *ext_ack;
2027         struct net_device *slave;
2028         struct dsa_port *dp;
2029
2030         ext_ack = netdev_notifier_info_to_extack(&info->info);
2031
2032         if (!is_vlan_dev(dev))
2033                 return NOTIFY_DONE;
2034
2035         slave = vlan_dev_real_dev(dev);
2036         if (!dsa_slave_dev_check(slave))
2037                 return NOTIFY_DONE;
2038
2039         dp = dsa_slave_to_port(slave);
2040         if (!dp->bridge_dev)
2041                 return NOTIFY_DONE;
2042
2043         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2044         if (br_vlan_enabled(dp->bridge_dev) &&
2045             netif_is_bridge_master(info->upper_dev) && info->linking) {
2046                 NL_SET_ERR_MSG_MOD(ext_ack,
2047                                    "Cannot enslave VLAN device into VLAN aware bridge");
2048                 return notifier_from_errno(-EINVAL);
2049         }
2050
2051         return NOTIFY_DONE;
2052 }
2053
2054 static int
2055 dsa_slave_check_8021q_upper(struct net_device *dev,
2056                             struct netdev_notifier_changeupper_info *info)
2057 {
2058         struct dsa_port *dp = dsa_slave_to_port(dev);
2059         struct net_device *br = dp->bridge_dev;
2060         struct bridge_vlan_info br_info;
2061         struct netlink_ext_ack *extack;
2062         int err = NOTIFY_DONE;
2063         u16 vid;
2064
2065         if (!br || !br_vlan_enabled(br))
2066                 return NOTIFY_DONE;
2067
2068         extack = netdev_notifier_info_to_extack(&info->info);
2069         vid = vlan_dev_vlan_id(info->upper_dev);
2070
2071         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2072          * device, respectively the VID is not found, returning
2073          * 0 means success, which is a failure for us here.
2074          */
2075         err = br_vlan_get_info(br, vid, &br_info);
2076         if (err == 0) {
2077                 NL_SET_ERR_MSG_MOD(extack,
2078                                    "This VLAN is already configured by the bridge");
2079                 return notifier_from_errno(-EBUSY);
2080         }
2081
2082         return NOTIFY_DONE;
2083 }
2084
2085 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2086                                      unsigned long event, void *ptr)
2087 {
2088         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2089
2090         switch (event) {
2091         case NETDEV_PRECHANGEUPPER: {
2092                 struct netdev_notifier_changeupper_info *info = ptr;
2093                 struct dsa_switch *ds;
2094                 struct dsa_port *dp;
2095                 int err;
2096
2097                 if (!dsa_slave_dev_check(dev))
2098                         return dsa_prevent_bridging_8021q_upper(dev, ptr);
2099
2100                 dp = dsa_slave_to_port(dev);
2101                 ds = dp->ds;
2102
2103                 if (ds->ops->port_prechangeupper) {
2104                         err = ds->ops->port_prechangeupper(ds, dp->index, info);
2105                         if (err)
2106                                 return notifier_from_errno(err);
2107                 }
2108
2109                 if (is_vlan_dev(info->upper_dev))
2110                         return dsa_slave_check_8021q_upper(dev, ptr);
2111                 break;
2112         }
2113         case NETDEV_CHANGEUPPER:
2114                 if (dsa_slave_dev_check(dev))
2115                         return dsa_slave_changeupper(dev, ptr);
2116
2117                 if (netif_is_lag_master(dev))
2118                         return dsa_slave_lag_changeupper(dev, ptr);
2119
2120                 break;
2121         case NETDEV_CHANGELOWERSTATE: {
2122                 struct netdev_notifier_changelowerstate_info *info = ptr;
2123                 struct dsa_port *dp;
2124                 int err;
2125
2126                 if (!dsa_slave_dev_check(dev))
2127                         break;
2128
2129                 dp = dsa_slave_to_port(dev);
2130
2131                 err = dsa_port_lag_change(dp, info->lower_state_info);
2132                 return notifier_from_errno(err);
2133         }
2134         case NETDEV_GOING_DOWN: {
2135                 struct dsa_port *dp, *cpu_dp;
2136                 struct dsa_switch_tree *dst;
2137                 LIST_HEAD(close_list);
2138
2139                 if (!netdev_uses_dsa(dev))
2140                         return NOTIFY_DONE;
2141
2142                 cpu_dp = dev->dsa_ptr;
2143                 dst = cpu_dp->ds->dst;
2144
2145                 list_for_each_entry(dp, &dst->ports, list) {
2146                         if (!dsa_is_user_port(dp->ds, dp->index))
2147                                 continue;
2148
2149                         list_add(&dp->slave->close_list, &close_list);
2150                 }
2151
2152                 dev_close_many(&close_list, true);
2153
2154                 return NOTIFY_OK;
2155         }
2156         default:
2157                 break;
2158         }
2159
2160         return NOTIFY_DONE;
2161 }
2162
2163 static void
2164 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2165 {
2166         struct dsa_switch *ds = switchdev_work->ds;
2167         struct switchdev_notifier_fdb_info info;
2168         struct dsa_port *dp;
2169
2170         if (!dsa_is_user_port(ds, switchdev_work->port))
2171                 return;
2172
2173         info.addr = switchdev_work->addr;
2174         info.vid = switchdev_work->vid;
2175         info.offloaded = true;
2176         dp = dsa_to_port(ds, switchdev_work->port);
2177         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2178                                  dp->slave, &info.info, NULL);
2179 }
2180
2181 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2182 {
2183         struct dsa_switchdev_event_work *switchdev_work =
2184                 container_of(work, struct dsa_switchdev_event_work, work);
2185         struct dsa_switch *ds = switchdev_work->ds;
2186         struct dsa_port *dp;
2187         int err;
2188
2189         dp = dsa_to_port(ds, switchdev_work->port);
2190
2191         rtnl_lock();
2192         switch (switchdev_work->event) {
2193         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2194                 err = dsa_port_fdb_add(dp, switchdev_work->addr,
2195                                        switchdev_work->vid);
2196                 if (err) {
2197                         dev_err(ds->dev,
2198                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2199                                 dp->index, switchdev_work->addr,
2200                                 switchdev_work->vid, err);
2201                         break;
2202                 }
2203                 dsa_fdb_offload_notify(switchdev_work);
2204                 break;
2205
2206         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2207                 err = dsa_port_fdb_del(dp, switchdev_work->addr,
2208                                        switchdev_work->vid);
2209                 if (err) {
2210                         dev_err(ds->dev,
2211                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2212                                 dp->index, switchdev_work->addr,
2213                                 switchdev_work->vid, err);
2214                 }
2215
2216                 break;
2217         }
2218         rtnl_unlock();
2219
2220         kfree(switchdev_work);
2221         if (dsa_is_user_port(ds, dp->index))
2222                 dev_put(dp->slave);
2223 }
2224
2225 static int dsa_lower_dev_walk(struct net_device *lower_dev,
2226                               struct netdev_nested_priv *priv)
2227 {
2228         if (dsa_slave_dev_check(lower_dev)) {
2229                 priv->data = (void *)netdev_priv(lower_dev);
2230                 return 1;
2231         }
2232
2233         return 0;
2234 }
2235
2236 static struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev)
2237 {
2238         struct netdev_nested_priv priv = {
2239                 .data = NULL,
2240         };
2241
2242         netdev_walk_all_lower_dev_rcu(dev, dsa_lower_dev_walk, &priv);
2243
2244         return (struct dsa_slave_priv *)priv.data;
2245 }
2246
2247 /* Called under rcu_read_lock() */
2248 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2249                                      unsigned long event, void *ptr)
2250 {
2251         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2252         const struct switchdev_notifier_fdb_info *fdb_info;
2253         struct dsa_switchdev_event_work *switchdev_work;
2254         struct dsa_port *dp;
2255         int err;
2256
2257         switch (event) {
2258         case SWITCHDEV_PORT_ATTR_SET:
2259                 err = switchdev_handle_port_attr_set(dev, ptr,
2260                                                      dsa_slave_dev_check,
2261                                                      dsa_slave_port_attr_set);
2262                 return notifier_from_errno(err);
2263         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2264         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2265                 fdb_info = ptr;
2266
2267                 if (dsa_slave_dev_check(dev)) {
2268                         if (!fdb_info->added_by_user)
2269                                 return NOTIFY_OK;
2270
2271                         dp = dsa_slave_to_port(dev);
2272                 } else {
2273                         /* Snoop addresses learnt on foreign interfaces
2274                          * bridged with us, for switches that don't
2275                          * automatically learn SA from CPU-injected traffic
2276                          */
2277                         struct net_device *br_dev;
2278                         struct dsa_slave_priv *p;
2279
2280                         br_dev = netdev_master_upper_dev_get_rcu(dev);
2281                         if (!br_dev)
2282                                 return NOTIFY_DONE;
2283
2284                         if (!netif_is_bridge_master(br_dev))
2285                                 return NOTIFY_DONE;
2286
2287                         p = dsa_slave_dev_lower_find(br_dev);
2288                         if (!p)
2289                                 return NOTIFY_DONE;
2290
2291                         dp = p->dp->cpu_dp;
2292
2293                         if (!dp->ds->assisted_learning_on_cpu_port)
2294                                 return NOTIFY_DONE;
2295
2296                         /* When the bridge learns an address on an offloaded
2297                          * LAG we don't want to send traffic to the CPU, the
2298                          * other ports bridged with the LAG should be able to
2299                          * autonomously forward towards it.
2300                          */
2301                         if (dsa_tree_offloads_netdev(dp->ds->dst, dev))
2302                                 return NOTIFY_DONE;
2303                 }
2304
2305                 if (!dp->ds->ops->port_fdb_add || !dp->ds->ops->port_fdb_del)
2306                         return NOTIFY_DONE;
2307
2308                 switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2309                 if (!switchdev_work)
2310                         return NOTIFY_BAD;
2311
2312                 INIT_WORK(&switchdev_work->work,
2313                           dsa_slave_switchdev_event_work);
2314                 switchdev_work->ds = dp->ds;
2315                 switchdev_work->port = dp->index;
2316                 switchdev_work->event = event;
2317
2318                 ether_addr_copy(switchdev_work->addr,
2319                                 fdb_info->addr);
2320                 switchdev_work->vid = fdb_info->vid;
2321
2322                 /* Hold a reference on the slave for dsa_fdb_offload_notify */
2323                 if (dsa_is_user_port(dp->ds, dp->index))
2324                         dev_hold(dev);
2325                 dsa_schedule_work(&switchdev_work->work);
2326                 break;
2327         default:
2328                 return NOTIFY_DONE;
2329         }
2330
2331         return NOTIFY_OK;
2332 }
2333
2334 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2335                                               unsigned long event, void *ptr)
2336 {
2337         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2338         int err;
2339
2340         switch (event) {
2341         case SWITCHDEV_PORT_OBJ_ADD:
2342                 err = switchdev_handle_port_obj_add(dev, ptr,
2343                                                     dsa_slave_dev_check,
2344                                                     dsa_slave_port_obj_add);
2345                 return notifier_from_errno(err);
2346         case SWITCHDEV_PORT_OBJ_DEL:
2347                 err = switchdev_handle_port_obj_del(dev, ptr,
2348                                                     dsa_slave_dev_check,
2349                                                     dsa_slave_port_obj_del);
2350                 return notifier_from_errno(err);
2351         case SWITCHDEV_PORT_ATTR_SET:
2352                 err = switchdev_handle_port_attr_set(dev, ptr,
2353                                                      dsa_slave_dev_check,
2354                                                      dsa_slave_port_attr_set);
2355                 return notifier_from_errno(err);
2356         }
2357
2358         return NOTIFY_DONE;
2359 }
2360
2361 static struct notifier_block dsa_slave_nb __read_mostly = {
2362         .notifier_call  = dsa_slave_netdevice_event,
2363 };
2364
2365 static struct notifier_block dsa_slave_switchdev_notifier = {
2366         .notifier_call = dsa_slave_switchdev_event,
2367 };
2368
2369 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2370         .notifier_call = dsa_slave_switchdev_blocking_event,
2371 };
2372
2373 int dsa_slave_register_notifier(void)
2374 {
2375         struct notifier_block *nb;
2376         int err;
2377
2378         err = register_netdevice_notifier(&dsa_slave_nb);
2379         if (err)
2380                 return err;
2381
2382         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2383         if (err)
2384                 goto err_switchdev_nb;
2385
2386         nb = &dsa_slave_switchdev_blocking_notifier;
2387         err = register_switchdev_blocking_notifier(nb);
2388         if (err)
2389                 goto err_switchdev_blocking_nb;
2390
2391         return 0;
2392
2393 err_switchdev_blocking_nb:
2394         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2395 err_switchdev_nb:
2396         unregister_netdevice_notifier(&dsa_slave_nb);
2397         return err;
2398 }
2399
2400 void dsa_slave_unregister_notifier(void)
2401 {
2402         struct notifier_block *nb;
2403         int err;
2404
2405         nb = &dsa_slave_switchdev_blocking_notifier;
2406         err = unregister_switchdev_blocking_notifier(nb);
2407         if (err)
2408                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2409
2410         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2411         if (err)
2412                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2413
2414         err = unregister_netdevice_notifier(&dsa_slave_nb);
2415         if (err)
2416                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2417 }