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