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