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/netpoll.h>
  21 #include <linux/ptp_classify.h>
  22
  23 #include "dsa_priv.h"
  24
  25 /* slave mii_bus handling ***************************************************/
  26 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  27 {
  28         struct dsa_switch *ds = bus->priv;
  29
  30         if (ds->phys_mii_mask & (1 << addr))
  31                 return ds->ops->phy_read(ds, addr, reg);
  32
  33         return 0xffff;
  34 }
  35
  36 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  37 {
  38         struct dsa_switch *ds = bus->priv;
  39
  40         if (ds->phys_mii_mask & (1 << addr))
  41                 return ds->ops->phy_write(ds, addr, reg, val);
  42
  43         return 0;
  44 }
  45
  46 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  47 {
  48         ds->slave_mii_bus->priv = (void *)ds;
  49         ds->slave_mii_bus->name = "dsa slave smi";
  50         ds->slave_mii_bus->read = dsa_slave_phy_read;
  51         ds->slave_mii_bus->write = dsa_slave_phy_write;
  52         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  53                  ds->dst->index, ds->index);
  54         ds->slave_mii_bus->parent = ds->dev;
  55         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  56 }
  57
  58
  59 /* slave device handling ****************************************************/
  60 static int dsa_slave_get_iflink(const struct net_device *dev)
  61 {
  62         return dsa_slave_to_master(dev)->ifindex;
  63 }
  64
  65 static int dsa_slave_open(struct net_device *dev)
  66 {
  67         struct net_device *master = dsa_slave_to_master(dev);
  68         struct dsa_port *dp = dsa_slave_to_port(dev);
  69         int err;
  70
  71         if (!(master->flags & IFF_UP))
  72                 return -ENETDOWN;
  73
  74         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  75                 err = dev_uc_add(master, dev->dev_addr);
  76                 if (err < 0)
  77                         goto out;
  78         }
  79
  80         if (dev->flags & IFF_ALLMULTI) {
  81                 err = dev_set_allmulti(master, 1);
  82                 if (err < 0)
  83                         goto del_unicast;
  84         }
  85         if (dev->flags & IFF_PROMISC) {
  86                 err = dev_set_promiscuity(master, 1);
  87                 if (err < 0)
  88                         goto clear_allmulti;
  89         }
  90
  91         err = dsa_port_enable_rt(dp, dev->phydev);
  92         if (err)
  93                 goto clear_promisc;
  94
  95         return 0;
  96
  97 clear_promisc:
  98         if (dev->flags & IFF_PROMISC)
  99                 dev_set_promiscuity(master, -1);
 100 clear_allmulti:
 101         if (dev->flags & IFF_ALLMULTI)
 102                 dev_set_allmulti(master, -1);
 103 del_unicast:
 104         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 105                 dev_uc_del(master, dev->dev_addr);
 106 out:
 107         return err;
 108 }
 109
 110 static int dsa_slave_close(struct net_device *dev)
 111 {
 112         struct net_device *master = dsa_slave_to_master(dev);
 113         struct dsa_port *dp = dsa_slave_to_port(dev);
 114
 115         dsa_port_disable_rt(dp);
 116
 117         dev_mc_unsync(master, dev);
 118         dev_uc_unsync(master, dev);
 119         if (dev->flags & IFF_ALLMULTI)
 120                 dev_set_allmulti(master, -1);
 121         if (dev->flags & IFF_PROMISC)
 122                 dev_set_promiscuity(master, -1);
 123
 124         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 125                 dev_uc_del(master, dev->dev_addr);
 126
 127         return 0;
 128 }
 129
 130 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 131 {
 132         struct net_device *master = dsa_slave_to_master(dev);
 133         if (dev->flags & IFF_UP) {
 134                 if (change & IFF_ALLMULTI)
 135                         dev_set_allmulti(master,
 136                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 137                 if (change & IFF_PROMISC)
 138                         dev_set_promiscuity(master,
 139                                             dev->flags & IFF_PROMISC ? 1 : -1);
 140         }
 141 }
 142
 143 static void dsa_slave_set_rx_mode(struct net_device *dev)
 144 {
 145         struct net_device *master = dsa_slave_to_master(dev);
 146
 147         dev_mc_sync(master, dev);
 148         dev_uc_sync(master, dev);
 149 }
 150
 151 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 152 {
 153         struct net_device *master = dsa_slave_to_master(dev);
 154         struct sockaddr *addr = a;
 155         int err;
 156
 157         if (!is_valid_ether_addr(addr->sa_data))
 158                 return -EADDRNOTAVAIL;
 159
 160         if (!(dev->flags & IFF_UP))
 161                 goto out;
 162
 163         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 164                 err = dev_uc_add(master, addr->sa_data);
 165                 if (err < 0)
 166                         return err;
 167         }
 168
 169         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 170                 dev_uc_del(master, dev->dev_addr);
 171
 172 out:
 173         ether_addr_copy(dev->dev_addr, addr->sa_data);
 174
 175         return 0;
 176 }
 177
 178 struct dsa_slave_dump_ctx {
 179         struct net_device *dev;
 180         struct sk_buff *skb;
 181         struct netlink_callback *cb;
 182         int idx;
 183 };
 184
 185 static int
 186 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 187                            bool is_static, void *data)
 188 {
 189         struct dsa_slave_dump_ctx *dump = data;
 190         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 191         u32 seq = dump->cb->nlh->nlmsg_seq;
 192         struct nlmsghdr *nlh;
 193         struct ndmsg *ndm;
 194
 195         if (dump->idx < dump->cb->args[2])
 196                 goto skip;
 197
 198         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 199                         sizeof(*ndm), NLM_F_MULTI);
 200         if (!nlh)
 201                 return -EMSGSIZE;
 202
 203         ndm = nlmsg_data(nlh);
 204         ndm->ndm_family  = AF_BRIDGE;
 205         ndm->ndm_pad1    = 0;
 206         ndm->ndm_pad2    = 0;
 207         ndm->ndm_flags   = NTF_SELF;
 208         ndm->ndm_type    = 0;
 209         ndm->ndm_ifindex = dump->dev->ifindex;
 210         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 211
 212         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 213                 goto nla_put_failure;
 214
 215         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 216                 goto nla_put_failure;
 217
 218         nlmsg_end(dump->skb, nlh);
 219
 220 skip:
 221         dump->idx++;
 222         return 0;
 223
 224 nla_put_failure:
 225         nlmsg_cancel(dump->skb, nlh);
 226         return -EMSGSIZE;
 227 }
 228
 229 static int
 230 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 231                    struct net_device *dev, struct net_device *filter_dev,
 232                    int *idx)
 233 {
 234         struct dsa_port *dp = dsa_slave_to_port(dev);
 235         struct dsa_slave_dump_ctx dump = {
 236                 .dev = dev,
 237                 .skb = skb,
 238                 .cb = cb,
 239                 .idx = *idx,
 240         };
 241         int err;
 242
 243         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 244         *idx = dump.idx;
 245
 246         return err;
 247 }
 248
 249 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 250 {
 251         struct dsa_slave_priv *p = netdev_priv(dev);
 252         struct dsa_switch *ds = p->dp->ds;
 253         int port = p->dp->index;
 254
 255         /* Pass through to switch driver if it supports timestamping */
 256         switch (cmd) {
 257         case SIOCGHWTSTAMP:
 258                 if (ds->ops->port_hwtstamp_get)
 259                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 260                 break;
 261         case SIOCSHWTSTAMP:
 262                 if (ds->ops->port_hwtstamp_set)
 263                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 264                 break;
 265         }
 266
 267         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 268 }
 269
 270 static int dsa_slave_port_attr_set(struct net_device *dev,
 271                                    const struct switchdev_attr *attr,
 272                                    struct switchdev_trans *trans)
 273 {
 274         struct dsa_port *dp = dsa_slave_to_port(dev);
 275         int ret;
 276
 277         switch (attr->id) {
 278         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 279                 ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
 280                 break;
 281         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 282                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 283                                               trans);
 284                 break;
 285         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 286                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
 287                 break;
 288         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 289                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 290                                                 trans);
 291                 break;
 292         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 293                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans);
 294                 break;
 295         case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 296                 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, trans);
 297                 break;
 298         default:
 299                 ret = -EOPNOTSUPP;
 300                 break;
 301         }
 302
 303         return ret;
 304 }
 305
 306 /* Must be called under rcu_read_lock() */
 307 static int
 308 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 309                                       const struct switchdev_obj_port_vlan *vlan)
 310 {
 311         struct net_device *upper_dev;
 312         struct list_head *iter;
 313
 314         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 315                 u16 vid;
 316
 317                 if (!is_vlan_dev(upper_dev))
 318                         continue;
 319
 320                 vid = vlan_dev_vlan_id(upper_dev);
 321                 if (vid >= vlan->vid_begin && vid <= vlan->vid_end)
 322                         return -EBUSY;
 323         }
 324
 325         return 0;
 326 }
 327
 328 static int dsa_slave_vlan_add(struct net_device *dev,
 329                               const struct switchdev_obj *obj,
 330                               struct switchdev_trans *trans)
 331 {
 332         struct net_device *master = dsa_slave_to_master(dev);
 333         struct dsa_port *dp = dsa_slave_to_port(dev);
 334         struct switchdev_obj_port_vlan vlan;
 335         int vid, err;
 336
 337         if (obj->orig_dev != dev)
 338                 return -EOPNOTSUPP;
 339
 340         if (dsa_port_skip_vlan_configuration(dp))
 341                 return 0;
 342
 343         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 344
 345         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 346          * the same VID.
 347          */
 348         if (trans->ph_prepare && br_vlan_enabled(dp->bridge_dev)) {
 349                 rcu_read_lock();
 350                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
 351                 rcu_read_unlock();
 352                 if (err)
 353                         return err;
 354         }
 355
 356         err = dsa_port_vlan_add(dp, &vlan, trans);
 357         if (err)
 358                 return err;
 359
 360         /* We need the dedicated CPU port to be a member of the VLAN as well.
 361          * Even though drivers often handle CPU membership in special ways,
 362          * it doesn't make sense to program a PVID, so clear this flag.
 363          */
 364         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 365
 366         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, trans);
 367         if (err)
 368                 return err;
 369
 370         for (vid = vlan.vid_begin; vid <= vlan.vid_end; vid++) {
 371                 err = vlan_vid_add(master, htons(ETH_P_8021Q), vid);
 372                 if (err)
 373                         return err;
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int dsa_slave_port_obj_add(struct net_device *dev,
 380                                   const struct switchdev_obj *obj,
 381                                   struct switchdev_trans *trans,
 382                                   struct netlink_ext_ack *extack)
 383 {
 384         struct dsa_port *dp = dsa_slave_to_port(dev);
 385         int err;
 386
 387         /* For the prepare phase, ensure the full set of changes is feasable in
 388          * one go in order to signal a failure properly. If an operation is not
 389          * supported, return -EOPNOTSUPP.
 390          */
 391
 392         switch (obj->id) {
 393         case SWITCHDEV_OBJ_ID_PORT_MDB:
 394                 if (obj->orig_dev != dev)
 395                         return -EOPNOTSUPP;
 396                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 397                 break;
 398         case SWITCHDEV_OBJ_ID_HOST_MDB:
 399                 /* DSA can directly translate this to a normal MDB add,
 400                  * but on the CPU port.
 401                  */
 402                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj),
 403                                        trans);
 404                 break;
 405         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 406                 err = dsa_slave_vlan_add(dev, obj, trans);
 407                 break;
 408         default:
 409                 err = -EOPNOTSUPP;
 410                 break;
 411         }
 412
 413         return err;
 414 }
 415
 416 static int dsa_slave_vlan_del(struct net_device *dev,
 417                               const struct switchdev_obj *obj)
 418 {
 419         struct net_device *master = dsa_slave_to_master(dev);
 420         struct dsa_port *dp = dsa_slave_to_port(dev);
 421         struct switchdev_obj_port_vlan *vlan;
 422         int vid, err;
 423
 424         if (obj->orig_dev != dev)
 425                 return -EOPNOTSUPP;
 426
 427         if (dsa_port_skip_vlan_configuration(dp))
 428                 return 0;
 429
 430         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 431
 432         /* Do not deprogram the CPU port as it may be shared with other user
 433          * ports which can be members of this VLAN as well.
 434          */
 435         err = dsa_port_vlan_del(dp, vlan);
 436         if (err)
 437                 return err;
 438
 439         for (vid = vlan->vid_begin; vid <= vlan->vid_end; vid++)
 440                 vlan_vid_del(master, htons(ETH_P_8021Q), vid);
 441
 442         return 0;
 443 }
 444
 445 static int dsa_slave_port_obj_del(struct net_device *dev,
 446                                   const struct switchdev_obj *obj)
 447 {
 448         struct dsa_port *dp = dsa_slave_to_port(dev);
 449         int err;
 450
 451         switch (obj->id) {
 452         case SWITCHDEV_OBJ_ID_PORT_MDB:
 453                 if (obj->orig_dev != dev)
 454                         return -EOPNOTSUPP;
 455                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 456                 break;
 457         case SWITCHDEV_OBJ_ID_HOST_MDB:
 458                 /* DSA can directly translate this to a normal MDB add,
 459                  * but on the CPU port.
 460                  */
 461                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 462                 break;
 463         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 464                 err = dsa_slave_vlan_del(dev, obj);
 465                 break;
 466         default:
 467                 err = -EOPNOTSUPP;
 468                 break;
 469         }
 470
 471         return err;
 472 }
 473
 474 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 475                                         struct netdev_phys_item_id *ppid)
 476 {
 477         struct dsa_port *dp = dsa_slave_to_port(dev);
 478         struct dsa_switch *ds = dp->ds;
 479         struct dsa_switch_tree *dst = ds->dst;
 480
 481         /* For non-legacy ports, devlink is used and it takes
 482          * care of the name generation. This ndo implementation
 483          * should be removed with legacy support.
 484          */
 485         if (dp->ds->devlink)
 486                 return -EOPNOTSUPP;
 487
 488         ppid->id_len = sizeof(dst->index);
 489         memcpy(&ppid->id, &dst->index, ppid->id_len);
 490
 491         return 0;
 492 }
 493
 494 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 495                                                      struct sk_buff *skb)
 496 {
 497 #ifdef CONFIG_NET_POLL_CONTROLLER
 498         struct dsa_slave_priv *p = netdev_priv(dev);
 499
 500         return netpoll_send_skb(p->netpoll, skb);
 501 #else
 502         BUG();
 503         return NETDEV_TX_OK;
 504 #endif
 505 }
 506
 507 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 508                                  struct sk_buff *skb)
 509 {
 510         struct dsa_switch *ds = p->dp->ds;
 511         struct sk_buff *clone;
 512         unsigned int type;
 513
 514         type = ptp_classify_raw(skb);
 515         if (type == PTP_CLASS_NONE)
 516                 return;
 517
 518         if (!ds->ops->port_txtstamp)
 519                 return;
 520
 521         clone = skb_clone_sk(skb);
 522         if (!clone)
 523                 return;
 524
 525         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type)) {
 526                 DSA_SKB_CB(skb)->clone = clone;
 527                 return;
 528         }
 529
 530         kfree_skb(clone);
 531 }
 532
 533 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 534 {
 535         /* SKB for netpoll still need to be mangled with the protocol-specific
 536          * tag to be successfully transmitted
 537          */
 538         if (unlikely(netpoll_tx_running(dev)))
 539                 return dsa_slave_netpoll_send_skb(dev, skb);
 540
 541         /* Queue the SKB for transmission on the parent interface, but
 542          * do not modify its EtherType
 543          */
 544         skb->dev = dsa_slave_to_master(dev);
 545         dev_queue_xmit(skb);
 546
 547         return NETDEV_TX_OK;
 548 }
 549 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 550
 551 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 552 {
 553         int needed_headroom = dev->needed_headroom;
 554         int needed_tailroom = dev->needed_tailroom;
 555
 556         /* For tail taggers, we need to pad short frames ourselves, to ensure
 557          * that the tail tag does not fail at its role of being at the end of
 558          * the packet, once the master interface pads the frame. Account for
 559          * that pad length here, and pad later.
 560          */
 561         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 562                 needed_tailroom += ETH_ZLEN - skb->len;
 563         /* skb_headroom() returns unsigned int... */
 564         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 565         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 566
 567         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 568                 /* No reallocation needed, yay! */
 569                 return 0;
 570
 571         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 572                                 GFP_ATOMIC);
 573 }
 574
 575 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 576 {
 577         struct dsa_slave_priv *p = netdev_priv(dev);
 578         struct sk_buff *nskb;
 579
 580         dev_sw_netstats_tx_add(dev, 1, skb->len);
 581
 582         DSA_SKB_CB(skb)->clone = NULL;
 583
 584         /* Identify PTP protocol packets, clone them, and pass them to the
 585          * switch driver
 586          */
 587         dsa_skb_tx_timestamp(p, skb);
 588
 589         if (dsa_realloc_skb(skb, dev)) {
 590                 dev_kfree_skb_any(skb);
 591                 return NETDEV_TX_OK;
 592         }
 593
 594         /* needed_tailroom should still be 'warm' in the cache line from
 595          * dsa_realloc_skb(), which has also ensured that padding is safe.
 596          */
 597         if (dev->needed_tailroom)
 598                 eth_skb_pad(skb);
 599
 600         /* Transmit function may have to reallocate the original SKB,
 601          * in which case it must have freed it. Only free it here on error.
 602          */
 603         nskb = p->xmit(skb, dev);
 604         if (!nskb) {
 605                 kfree_skb(skb);
 606                 return NETDEV_TX_OK;
 607         }
 608
 609         return dsa_enqueue_skb(nskb, dev);
 610 }
 611
 612 /* ethtool operations *******************************************************/
 613
 614 static void dsa_slave_get_drvinfo(struct net_device *dev,
 615                                   struct ethtool_drvinfo *drvinfo)
 616 {
 617         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 618         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 619         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 620 }
 621
 622 static int dsa_slave_get_regs_len(struct net_device *dev)
 623 {
 624         struct dsa_port *dp = dsa_slave_to_port(dev);
 625         struct dsa_switch *ds = dp->ds;
 626
 627         if (ds->ops->get_regs_len)
 628                 return ds->ops->get_regs_len(ds, dp->index);
 629
 630         return -EOPNOTSUPP;
 631 }
 632
 633 static void
 634 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 635 {
 636         struct dsa_port *dp = dsa_slave_to_port(dev);
 637         struct dsa_switch *ds = dp->ds;
 638
 639         if (ds->ops->get_regs)
 640                 ds->ops->get_regs(ds, dp->index, regs, _p);
 641 }
 642
 643 static int dsa_slave_nway_reset(struct net_device *dev)
 644 {
 645         struct dsa_port *dp = dsa_slave_to_port(dev);
 646
 647         return phylink_ethtool_nway_reset(dp->pl);
 648 }
 649
 650 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 651 {
 652         struct dsa_port *dp = dsa_slave_to_port(dev);
 653         struct dsa_switch *ds = dp->ds;
 654
 655         if (ds->cd && ds->cd->eeprom_len)
 656                 return ds->cd->eeprom_len;
 657
 658         if (ds->ops->get_eeprom_len)
 659                 return ds->ops->get_eeprom_len(ds);
 660
 661         return 0;
 662 }
 663
 664 static int dsa_slave_get_eeprom(struct net_device *dev,
 665                                 struct ethtool_eeprom *eeprom, u8 *data)
 666 {
 667         struct dsa_port *dp = dsa_slave_to_port(dev);
 668         struct dsa_switch *ds = dp->ds;
 669
 670         if (ds->ops->get_eeprom)
 671                 return ds->ops->get_eeprom(ds, eeprom, data);
 672
 673         return -EOPNOTSUPP;
 674 }
 675
 676 static int dsa_slave_set_eeprom(struct net_device *dev,
 677                                 struct ethtool_eeprom *eeprom, u8 *data)
 678 {
 679         struct dsa_port *dp = dsa_slave_to_port(dev);
 680         struct dsa_switch *ds = dp->ds;
 681
 682         if (ds->ops->set_eeprom)
 683                 return ds->ops->set_eeprom(ds, eeprom, data);
 684
 685         return -EOPNOTSUPP;
 686 }
 687
 688 static void dsa_slave_get_strings(struct net_device *dev,
 689                                   uint32_t stringset, uint8_t *data)
 690 {
 691         struct dsa_port *dp = dsa_slave_to_port(dev);
 692         struct dsa_switch *ds = dp->ds;
 693
 694         if (stringset == ETH_SS_STATS) {
 695                 int len = ETH_GSTRING_LEN;
 696
 697                 strncpy(data, "tx_packets", len);
 698                 strncpy(data + len, "tx_bytes", len);
 699                 strncpy(data + 2 * len, "rx_packets", len);
 700                 strncpy(data + 3 * len, "rx_bytes", len);
 701                 if (ds->ops->get_strings)
 702                         ds->ops->get_strings(ds, dp->index, stringset,
 703                                              data + 4 * len);
 704         }
 705 }
 706
 707 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 708                                         struct ethtool_stats *stats,
 709                                         uint64_t *data)
 710 {
 711         struct dsa_port *dp = dsa_slave_to_port(dev);
 712         struct dsa_switch *ds = dp->ds;
 713         struct pcpu_sw_netstats *s;
 714         unsigned int start;
 715         int i;
 716
 717         for_each_possible_cpu(i) {
 718                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 719
 720                 s = per_cpu_ptr(dev->tstats, i);
 721                 do {
 722                         start = u64_stats_fetch_begin_irq(&s->syncp);
 723                         tx_packets = s->tx_packets;
 724                         tx_bytes = s->tx_bytes;
 725                         rx_packets = s->rx_packets;
 726                         rx_bytes = s->rx_bytes;
 727                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 728                 data[0] += tx_packets;
 729                 data[1] += tx_bytes;
 730                 data[2] += rx_packets;
 731                 data[3] += rx_bytes;
 732         }
 733         if (ds->ops->get_ethtool_stats)
 734                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 735 }
 736
 737 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 738 {
 739         struct dsa_port *dp = dsa_slave_to_port(dev);
 740         struct dsa_switch *ds = dp->ds;
 741
 742         if (sset == ETH_SS_STATS) {
 743                 int count;
 744
 745                 count = 4;
 746                 if (ds->ops->get_sset_count)
 747                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 748
 749                 return count;
 750         }
 751
 752         return -EOPNOTSUPP;
 753 }
 754
 755 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 756 {
 757         struct dsa_port *dp = dsa_slave_to_port(dev);
 758         struct dsa_switch *ds = dp->ds;
 759
 760         phylink_ethtool_get_wol(dp->pl, w);
 761
 762         if (ds->ops->get_wol)
 763                 ds->ops->get_wol(ds, dp->index, w);
 764 }
 765
 766 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 767 {
 768         struct dsa_port *dp = dsa_slave_to_port(dev);
 769         struct dsa_switch *ds = dp->ds;
 770         int ret = -EOPNOTSUPP;
 771
 772         phylink_ethtool_set_wol(dp->pl, w);
 773
 774         if (ds->ops->set_wol)
 775                 ret = ds->ops->set_wol(ds, dp->index, w);
 776
 777         return ret;
 778 }
 779
 780 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 781 {
 782         struct dsa_port *dp = dsa_slave_to_port(dev);
 783         struct dsa_switch *ds = dp->ds;
 784         int ret;
 785
 786         /* Port's PHY and MAC both need to be EEE capable */
 787         if (!dev->phydev || !dp->pl)
 788                 return -ENODEV;
 789
 790         if (!ds->ops->set_mac_eee)
 791                 return -EOPNOTSUPP;
 792
 793         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 794         if (ret)
 795                 return ret;
 796
 797         return phylink_ethtool_set_eee(dp->pl, e);
 798 }
 799
 800 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 801 {
 802         struct dsa_port *dp = dsa_slave_to_port(dev);
 803         struct dsa_switch *ds = dp->ds;
 804         int ret;
 805
 806         /* Port's PHY and MAC both need to be EEE capable */
 807         if (!dev->phydev || !dp->pl)
 808                 return -ENODEV;
 809
 810         if (!ds->ops->get_mac_eee)
 811                 return -EOPNOTSUPP;
 812
 813         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 814         if (ret)
 815                 return ret;
 816
 817         return phylink_ethtool_get_eee(dp->pl, e);
 818 }
 819
 820 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 821                                         struct ethtool_link_ksettings *cmd)
 822 {
 823         struct dsa_port *dp = dsa_slave_to_port(dev);
 824
 825         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 826 }
 827
 828 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 829                                         const struct ethtool_link_ksettings *cmd)
 830 {
 831         struct dsa_port *dp = dsa_slave_to_port(dev);
 832
 833         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 834 }
 835
 836 static void dsa_slave_get_pauseparam(struct net_device *dev,
 837                                      struct ethtool_pauseparam *pause)
 838 {
 839         struct dsa_port *dp = dsa_slave_to_port(dev);
 840
 841         phylink_ethtool_get_pauseparam(dp->pl, pause);
 842 }
 843
 844 static int dsa_slave_set_pauseparam(struct net_device *dev,
 845                                     struct ethtool_pauseparam *pause)
 846 {
 847         struct dsa_port *dp = dsa_slave_to_port(dev);
 848
 849         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 850 }
 851
 852 #ifdef CONFIG_NET_POLL_CONTROLLER
 853 static int dsa_slave_netpoll_setup(struct net_device *dev,
 854                                    struct netpoll_info *ni)
 855 {
 856         struct net_device *master = dsa_slave_to_master(dev);
 857         struct dsa_slave_priv *p = netdev_priv(dev);
 858         struct netpoll *netpoll;
 859         int err = 0;
 860
 861         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 862         if (!netpoll)
 863                 return -ENOMEM;
 864
 865         err = __netpoll_setup(netpoll, master);
 866         if (err) {
 867                 kfree(netpoll);
 868                 goto out;
 869         }
 870
 871         p->netpoll = netpoll;
 872 out:
 873         return err;
 874 }
 875
 876 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 877 {
 878         struct dsa_slave_priv *p = netdev_priv(dev);
 879         struct netpoll *netpoll = p->netpoll;
 880
 881         if (!netpoll)
 882                 return;
 883
 884         p->netpoll = NULL;
 885
 886         __netpoll_free(netpoll);
 887 }
 888
 889 static void dsa_slave_poll_controller(struct net_device *dev)
 890 {
 891 }
 892 #endif
 893
 894 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 895                                         char *name, size_t len)
 896 {
 897         struct dsa_port *dp = dsa_slave_to_port(dev);
 898
 899         /* For non-legacy ports, devlink is used and it takes
 900          * care of the name generation. This ndo implementation
 901          * should be removed with legacy support.
 902          */
 903         if (dp->ds->devlink)
 904                 return -EOPNOTSUPP;
 905
 906         if (snprintf(name, len, "p%d", dp->index) >= len)
 907                 return -EINVAL;
 908
 909         return 0;
 910 }
 911
 912 static struct dsa_mall_tc_entry *
 913 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 914 {
 915         struct dsa_slave_priv *p = netdev_priv(dev);
 916         struct dsa_mall_tc_entry *mall_tc_entry;
 917
 918         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 919                 if (mall_tc_entry->cookie == cookie)
 920                         return mall_tc_entry;
 921
 922         return NULL;
 923 }
 924
 925 static int
 926 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 927                                   struct tc_cls_matchall_offload *cls,
 928                                   bool ingress)
 929 {
 930         struct dsa_port *dp = dsa_slave_to_port(dev);
 931         struct dsa_slave_priv *p = netdev_priv(dev);
 932         struct dsa_mall_mirror_tc_entry *mirror;
 933         struct dsa_mall_tc_entry *mall_tc_entry;
 934         struct dsa_switch *ds = dp->ds;
 935         struct flow_action_entry *act;
 936         struct dsa_port *to_dp;
 937         int err;
 938
 939         if (!ds->ops->port_mirror_add)
 940                 return -EOPNOTSUPP;
 941
 942         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 943                                               cls->common.extack))
 944                 return -EOPNOTSUPP;
 945
 946         act = &cls->rule->action.entries[0];
 947
 948         if (!act->dev)
 949                 return -EINVAL;
 950
 951         if (!dsa_slave_dev_check(act->dev))
 952                 return -EOPNOTSUPP;
 953
 954         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 955         if (!mall_tc_entry)
 956                 return -ENOMEM;
 957
 958         mall_tc_entry->cookie = cls->cookie;
 959         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 960         mirror = &mall_tc_entry->mirror;
 961
 962         to_dp = dsa_slave_to_port(act->dev);
 963
 964         mirror->to_local_port = to_dp->index;
 965         mirror->ingress = ingress;
 966
 967         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 968         if (err) {
 969                 kfree(mall_tc_entry);
 970                 return err;
 971         }
 972
 973         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 974
 975         return err;
 976 }
 977
 978 static int
 979 dsa_slave_add_cls_matchall_police(struct net_device *dev,
 980                                   struct tc_cls_matchall_offload *cls,
 981                                   bool ingress)
 982 {
 983         struct netlink_ext_ack *extack = cls->common.extack;
 984         struct dsa_port *dp = dsa_slave_to_port(dev);
 985         struct dsa_slave_priv *p = netdev_priv(dev);
 986         struct dsa_mall_policer_tc_entry *policer;
 987         struct dsa_mall_tc_entry *mall_tc_entry;
 988         struct dsa_switch *ds = dp->ds;
 989         struct flow_action_entry *act;
 990         int err;
 991
 992         if (!ds->ops->port_policer_add) {
 993                 NL_SET_ERR_MSG_MOD(extack,
 994                                    "Policing offload not implemented");
 995                 return -EOPNOTSUPP;
 996         }
 997
 998         if (!ingress) {
 999                 NL_SET_ERR_MSG_MOD(extack,
1000                                    "Only supported on ingress qdisc");
1001                 return -EOPNOTSUPP;
1002         }
1003
1004         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1005                                               cls->common.extack))
1006                 return -EOPNOTSUPP;
1007
1008         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1009                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1010                         NL_SET_ERR_MSG_MOD(extack,
1011                                            "Only one port policer allowed");
1012                         return -EEXIST;
1013                 }
1014         }
1015
1016         act = &cls->rule->action.entries[0];
1017
1018         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1019         if (!mall_tc_entry)
1020                 return -ENOMEM;
1021
1022         mall_tc_entry->cookie = cls->cookie;
1023         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1024         policer = &mall_tc_entry->policer;
1025         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1026         policer->burst = act->police.burst;
1027
1028         err = ds->ops->port_policer_add(ds, dp->index, policer);
1029         if (err) {
1030                 kfree(mall_tc_entry);
1031                 return err;
1032         }
1033
1034         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1035
1036         return err;
1037 }
1038
1039 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1040                                       struct tc_cls_matchall_offload *cls,
1041                                       bool ingress)
1042 {
1043         int err = -EOPNOTSUPP;
1044
1045         if (cls->common.protocol == htons(ETH_P_ALL) &&
1046             flow_offload_has_one_action(&cls->rule->action) &&
1047             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1048                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1049         else if (flow_offload_has_one_action(&cls->rule->action) &&
1050                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1051                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1052
1053         return err;
1054 }
1055
1056 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1057                                        struct tc_cls_matchall_offload *cls)
1058 {
1059         struct dsa_port *dp = dsa_slave_to_port(dev);
1060         struct dsa_mall_tc_entry *mall_tc_entry;
1061         struct dsa_switch *ds = dp->ds;
1062
1063         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1064         if (!mall_tc_entry)
1065                 return;
1066
1067         list_del(&mall_tc_entry->list);
1068
1069         switch (mall_tc_entry->type) {
1070         case DSA_PORT_MALL_MIRROR:
1071                 if (ds->ops->port_mirror_del)
1072                         ds->ops->port_mirror_del(ds, dp->index,
1073                                                  &mall_tc_entry->mirror);
1074                 break;
1075         case DSA_PORT_MALL_POLICER:
1076                 if (ds->ops->port_policer_del)
1077                         ds->ops->port_policer_del(ds, dp->index);
1078                 break;
1079         default:
1080                 WARN_ON(1);
1081         }
1082
1083         kfree(mall_tc_entry);
1084 }
1085
1086 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1087                                            struct tc_cls_matchall_offload *cls,
1088                                            bool ingress)
1089 {
1090         if (cls->common.chain_index)
1091                 return -EOPNOTSUPP;
1092
1093         switch (cls->command) {
1094         case TC_CLSMATCHALL_REPLACE:
1095                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1096         case TC_CLSMATCHALL_DESTROY:
1097                 dsa_slave_del_cls_matchall(dev, cls);
1098                 return 0;
1099         default:
1100                 return -EOPNOTSUPP;
1101         }
1102 }
1103
1104 static int dsa_slave_add_cls_flower(struct net_device *dev,
1105                                     struct flow_cls_offload *cls,
1106                                     bool ingress)
1107 {
1108         struct dsa_port *dp = dsa_slave_to_port(dev);
1109         struct dsa_switch *ds = dp->ds;
1110         int port = dp->index;
1111
1112         if (!ds->ops->cls_flower_add)
1113                 return -EOPNOTSUPP;
1114
1115         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1116 }
1117
1118 static int dsa_slave_del_cls_flower(struct net_device *dev,
1119                                     struct flow_cls_offload *cls,
1120                                     bool ingress)
1121 {
1122         struct dsa_port *dp = dsa_slave_to_port(dev);
1123         struct dsa_switch *ds = dp->ds;
1124         int port = dp->index;
1125
1126         if (!ds->ops->cls_flower_del)
1127                 return -EOPNOTSUPP;
1128
1129         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1130 }
1131
1132 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1133                                       struct flow_cls_offload *cls,
1134                                       bool ingress)
1135 {
1136         struct dsa_port *dp = dsa_slave_to_port(dev);
1137         struct dsa_switch *ds = dp->ds;
1138         int port = dp->index;
1139
1140         if (!ds->ops->cls_flower_stats)
1141                 return -EOPNOTSUPP;
1142
1143         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1144 }
1145
1146 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1147                                          struct flow_cls_offload *cls,
1148                                          bool ingress)
1149 {
1150         switch (cls->command) {
1151         case FLOW_CLS_REPLACE:
1152                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1153         case FLOW_CLS_DESTROY:
1154                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1155         case FLOW_CLS_STATS:
1156                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1157         default:
1158                 return -EOPNOTSUPP;
1159         }
1160 }
1161
1162 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1163                                        void *cb_priv, bool ingress)
1164 {
1165         struct net_device *dev = cb_priv;
1166
1167         if (!tc_can_offload(dev))
1168                 return -EOPNOTSUPP;
1169
1170         switch (type) {
1171         case TC_SETUP_CLSMATCHALL:
1172                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1173         case TC_SETUP_CLSFLOWER:
1174                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1175         default:
1176                 return -EOPNOTSUPP;
1177         }
1178 }
1179
1180 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1181                                           void *type_data, void *cb_priv)
1182 {
1183         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1184 }
1185
1186 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1187                                           void *type_data, void *cb_priv)
1188 {
1189         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1190 }
1191
1192 static LIST_HEAD(dsa_slave_block_cb_list);
1193
1194 static int dsa_slave_setup_tc_block(struct net_device *dev,
1195                                     struct flow_block_offload *f)
1196 {
1197         struct flow_block_cb *block_cb;
1198         flow_setup_cb_t *cb;
1199
1200         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1201                 cb = dsa_slave_setup_tc_block_cb_ig;
1202         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1203                 cb = dsa_slave_setup_tc_block_cb_eg;
1204         else
1205                 return -EOPNOTSUPP;
1206
1207         f->driver_block_list = &dsa_slave_block_cb_list;
1208
1209         switch (f->command) {
1210         case FLOW_BLOCK_BIND:
1211                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1212                         return -EBUSY;
1213
1214                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1215                 if (IS_ERR(block_cb))
1216                         return PTR_ERR(block_cb);
1217
1218                 flow_block_cb_add(block_cb, f);
1219                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1220                 return 0;
1221         case FLOW_BLOCK_UNBIND:
1222                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1223                 if (!block_cb)
1224                         return -ENOENT;
1225
1226                 flow_block_cb_remove(block_cb, f);
1227                 list_del(&block_cb->driver_list);
1228                 return 0;
1229         default:
1230                 return -EOPNOTSUPP;
1231         }
1232 }
1233
1234 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1235                               void *type_data)
1236 {
1237         struct dsa_port *dp = dsa_slave_to_port(dev);
1238         struct dsa_switch *ds = dp->ds;
1239
1240         if (type == TC_SETUP_BLOCK)
1241                 return dsa_slave_setup_tc_block(dev, type_data);
1242
1243         if (!ds->ops->port_setup_tc)
1244                 return -EOPNOTSUPP;
1245
1246         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1247 }
1248
1249 static int dsa_slave_get_rxnfc(struct net_device *dev,
1250                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1251 {
1252         struct dsa_port *dp = dsa_slave_to_port(dev);
1253         struct dsa_switch *ds = dp->ds;
1254
1255         if (!ds->ops->get_rxnfc)
1256                 return -EOPNOTSUPP;
1257
1258         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1259 }
1260
1261 static int dsa_slave_set_rxnfc(struct net_device *dev,
1262                                struct ethtool_rxnfc *nfc)
1263 {
1264         struct dsa_port *dp = dsa_slave_to_port(dev);
1265         struct dsa_switch *ds = dp->ds;
1266
1267         if (!ds->ops->set_rxnfc)
1268                 return -EOPNOTSUPP;
1269
1270         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1271 }
1272
1273 static int dsa_slave_get_ts_info(struct net_device *dev,
1274                                  struct ethtool_ts_info *ts)
1275 {
1276         struct dsa_slave_priv *p = netdev_priv(dev);
1277         struct dsa_switch *ds = p->dp->ds;
1278
1279         if (!ds->ops->get_ts_info)
1280                 return -EOPNOTSUPP;
1281
1282         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1283 }
1284
1285 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1286                                      u16 vid)
1287 {
1288         struct net_device *master = dsa_slave_to_master(dev);
1289         struct dsa_port *dp = dsa_slave_to_port(dev);
1290         struct switchdev_obj_port_vlan vlan = {
1291                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1292                 .vid_begin = vid,
1293                 .vid_end = vid,
1294                 /* This API only allows programming tagged, non-PVID VIDs */
1295                 .flags = 0,
1296         };
1297         struct switchdev_trans trans;
1298         int ret;
1299
1300         /* User port... */
1301         trans.ph_prepare = true;
1302         ret = dsa_port_vlan_add(dp, &vlan, &trans);
1303         if (ret)
1304                 return ret;
1305
1306         trans.ph_prepare = false;
1307         ret = dsa_port_vlan_add(dp, &vlan, &trans);
1308         if (ret)
1309                 return ret;
1310
1311         /* And CPU port... */
1312         trans.ph_prepare = true;
1313         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &trans);
1314         if (ret)
1315                 return ret;
1316
1317         trans.ph_prepare = false;
1318         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &trans);
1319         if (ret)
1320                 return ret;
1321
1322         return vlan_vid_add(master, proto, vid);
1323 }
1324
1325 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1326                                       u16 vid)
1327 {
1328         struct net_device *master = dsa_slave_to_master(dev);
1329         struct dsa_port *dp = dsa_slave_to_port(dev);
1330         struct switchdev_obj_port_vlan vlan = {
1331                 .vid_begin = vid,
1332                 .vid_end = vid,
1333                 /* This API only allows programming tagged, non-PVID VIDs */
1334                 .flags = 0,
1335         };
1336         int err;
1337
1338         /* Do not deprogram the CPU port as it may be shared with other user
1339          * ports which can be members of this VLAN as well.
1340          */
1341         err = dsa_port_vlan_del(dp, &vlan);
1342         if (err)
1343                 return err;
1344
1345         vlan_vid_del(master, proto, vid);
1346
1347         return 0;
1348 }
1349
1350 struct dsa_hw_port {
1351         struct list_head list;
1352         struct net_device *dev;
1353         int old_mtu;
1354 };
1355
1356 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1357 {
1358         const struct dsa_hw_port *p;
1359         int err;
1360
1361         list_for_each_entry(p, hw_port_list, list) {
1362                 if (p->dev->mtu == mtu)
1363                         continue;
1364
1365                 err = dev_set_mtu(p->dev, mtu);
1366                 if (err)
1367                         goto rollback;
1368         }
1369
1370         return 0;
1371
1372 rollback:
1373         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1374                 if (p->dev->mtu == p->old_mtu)
1375                         continue;
1376
1377                 if (dev_set_mtu(p->dev, p->old_mtu))
1378                         netdev_err(p->dev, "Failed to restore MTU\n");
1379         }
1380
1381         return err;
1382 }
1383
1384 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1385 {
1386         struct dsa_hw_port *p, *n;
1387
1388         list_for_each_entry_safe(p, n, hw_port_list, list)
1389                 kfree(p);
1390 }
1391
1392 /* Make the hardware datapath to/from @dev limited to a common MTU */
1393 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1394 {
1395         struct list_head hw_port_list;
1396         struct dsa_switch_tree *dst;
1397         int min_mtu = ETH_MAX_MTU;
1398         struct dsa_port *other_dp;
1399         int err;
1400
1401         if (!dp->ds->mtu_enforcement_ingress)
1402                 return;
1403
1404         if (!dp->bridge_dev)
1405                 return;
1406
1407         INIT_LIST_HEAD(&hw_port_list);
1408
1409         /* Populate the list of ports that are part of the same bridge
1410          * as the newly added/modified port
1411          */
1412         list_for_each_entry(dst, &dsa_tree_list, list) {
1413                 list_for_each_entry(other_dp, &dst->ports, list) {
1414                         struct dsa_hw_port *hw_port;
1415                         struct net_device *slave;
1416
1417                         if (other_dp->type != DSA_PORT_TYPE_USER)
1418                                 continue;
1419
1420                         if (other_dp->bridge_dev != dp->bridge_dev)
1421                                 continue;
1422
1423                         if (!other_dp->ds->mtu_enforcement_ingress)
1424                                 continue;
1425
1426                         slave = other_dp->slave;
1427
1428                         if (min_mtu > slave->mtu)
1429                                 min_mtu = slave->mtu;
1430
1431                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1432                         if (!hw_port)
1433                                 goto out;
1434
1435                         hw_port->dev = slave;
1436                         hw_port->old_mtu = slave->mtu;
1437
1438                         list_add(&hw_port->list, &hw_port_list);
1439                 }
1440         }
1441
1442         /* Attempt to configure the entire hardware bridge to the newly added
1443          * interface's MTU first, regardless of whether the intention of the
1444          * user was to raise or lower it.
1445          */
1446         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1447         if (!err)
1448                 goto out;
1449
1450         /* Clearly that didn't work out so well, so just set the minimum MTU on
1451          * all hardware bridge ports now. If this fails too, then all ports will
1452          * still have their old MTU rolled back anyway.
1453          */
1454         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1455
1456 out:
1457         dsa_hw_port_list_free(&hw_port_list);
1458 }
1459
1460 static int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1461 {
1462         struct net_device *master = dsa_slave_to_master(dev);
1463         struct dsa_port *dp = dsa_slave_to_port(dev);
1464         struct dsa_slave_priv *p = netdev_priv(dev);
1465         struct dsa_switch *ds = p->dp->ds;
1466         struct dsa_port *cpu_dp;
1467         int port = p->dp->index;
1468         int largest_mtu = 0;
1469         int new_master_mtu;
1470         int old_master_mtu;
1471         int mtu_limit;
1472         int cpu_mtu;
1473         int err, i;
1474
1475         if (!ds->ops->port_change_mtu)
1476                 return -EOPNOTSUPP;
1477
1478         for (i = 0; i < ds->num_ports; i++) {
1479                 int slave_mtu;
1480
1481                 if (!dsa_is_user_port(ds, i))
1482                         continue;
1483
1484                 /* During probe, this function will be called for each slave
1485                  * device, while not all of them have been allocated. That's
1486                  * ok, it doesn't change what the maximum is, so ignore it.
1487                  */
1488                 if (!dsa_to_port(ds, i)->slave)
1489                         continue;
1490
1491                 /* Pretend that we already applied the setting, which we
1492                  * actually haven't (still haven't done all integrity checks)
1493                  */
1494                 if (i == port)
1495                         slave_mtu = new_mtu;
1496                 else
1497                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1498
1499                 if (largest_mtu < slave_mtu)
1500                         largest_mtu = slave_mtu;
1501         }
1502
1503         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1504
1505         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1506         old_master_mtu = master->mtu;
1507         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1508         if (new_master_mtu > mtu_limit)
1509                 return -ERANGE;
1510
1511         /* If the master MTU isn't over limit, there's no need to check the CPU
1512          * MTU, since that surely isn't either.
1513          */
1514         cpu_mtu = largest_mtu;
1515
1516         /* Start applying stuff */
1517         if (new_master_mtu != old_master_mtu) {
1518                 err = dev_set_mtu(master, new_master_mtu);
1519                 if (err < 0)
1520                         goto out_master_failed;
1521
1522                 /* We only need to propagate the MTU of the CPU port to
1523                  * upstream switches.
1524                  */
1525                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1526                 if (err)
1527                         goto out_cpu_failed;
1528         }
1529
1530         err = dsa_port_mtu_change(dp, new_mtu, false);
1531         if (err)
1532                 goto out_port_failed;
1533
1534         dev->mtu = new_mtu;
1535
1536         dsa_bridge_mtu_normalization(dp);
1537
1538         return 0;
1539
1540 out_port_failed:
1541         if (new_master_mtu != old_master_mtu)
1542                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1543                                     cpu_dp->tag_ops->overhead,
1544                                     true);
1545 out_cpu_failed:
1546         if (new_master_mtu != old_master_mtu)
1547                 dev_set_mtu(master, old_master_mtu);
1548 out_master_failed:
1549         return err;
1550 }
1551
1552 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1553         .get_drvinfo            = dsa_slave_get_drvinfo,
1554         .get_regs_len           = dsa_slave_get_regs_len,
1555         .get_regs               = dsa_slave_get_regs,
1556         .nway_reset             = dsa_slave_nway_reset,
1557         .get_link               = ethtool_op_get_link,
1558         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1559         .get_eeprom             = dsa_slave_get_eeprom,
1560         .set_eeprom             = dsa_slave_set_eeprom,
1561         .get_strings            = dsa_slave_get_strings,
1562         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1563         .get_sset_count         = dsa_slave_get_sset_count,
1564         .set_wol                = dsa_slave_set_wol,
1565         .get_wol                = dsa_slave_get_wol,
1566         .set_eee                = dsa_slave_set_eee,
1567         .get_eee                = dsa_slave_get_eee,
1568         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1569         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1570         .get_pauseparam         = dsa_slave_get_pauseparam,
1571         .set_pauseparam         = dsa_slave_set_pauseparam,
1572         .get_rxnfc              = dsa_slave_get_rxnfc,
1573         .set_rxnfc              = dsa_slave_set_rxnfc,
1574         .get_ts_info            = dsa_slave_get_ts_info,
1575 };
1576
1577 /* legacy way, bypassing the bridge *****************************************/
1578 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1579                        struct net_device *dev,
1580                        const unsigned char *addr, u16 vid,
1581                        u16 flags,
1582                        struct netlink_ext_ack *extack)
1583 {
1584         struct dsa_port *dp = dsa_slave_to_port(dev);
1585
1586         return dsa_port_fdb_add(dp, addr, vid);
1587 }
1588
1589 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1590                        struct net_device *dev,
1591                        const unsigned char *addr, u16 vid)
1592 {
1593         struct dsa_port *dp = dsa_slave_to_port(dev);
1594
1595         return dsa_port_fdb_del(dp, addr, vid);
1596 }
1597
1598 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1599 {
1600         struct dsa_port *dp = dsa_slave_to_port(dev);
1601
1602         return dp->ds->devlink ? &dp->devlink_port : NULL;
1603 }
1604
1605 static const struct net_device_ops dsa_slave_netdev_ops = {
1606         .ndo_open               = dsa_slave_open,
1607         .ndo_stop               = dsa_slave_close,
1608         .ndo_start_xmit         = dsa_slave_xmit,
1609         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1610         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1611         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1612         .ndo_fdb_add            = dsa_legacy_fdb_add,
1613         .ndo_fdb_del            = dsa_legacy_fdb_del,
1614         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1615         .ndo_do_ioctl           = dsa_slave_ioctl,
1616         .ndo_get_iflink         = dsa_slave_get_iflink,
1617 #ifdef CONFIG_NET_POLL_CONTROLLER
1618         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1619         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1620         .ndo_poll_controller    = dsa_slave_poll_controller,
1621 #endif
1622         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1623         .ndo_setup_tc           = dsa_slave_setup_tc,
1624         .ndo_get_stats64        = dev_get_tstats64,
1625         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1626         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1627         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1628         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1629         .ndo_change_mtu         = dsa_slave_change_mtu,
1630 };
1631
1632 static struct device_type dsa_type = {
1633         .name   = "dsa",
1634 };
1635
1636 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1637 {
1638         const struct dsa_port *dp = dsa_to_port(ds, port);
1639
1640         if (dp->pl)
1641                 phylink_mac_change(dp->pl, up);
1642 }
1643 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1644
1645 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1646                                           struct phylink_link_state *state)
1647 {
1648         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1649         struct dsa_switch *ds = dp->ds;
1650
1651         /* No need to check that this operation is valid, the callback would
1652          * not be called if it was not.
1653          */
1654         ds->ops->phylink_fixed_state(ds, dp->index, state);
1655 }
1656
1657 /* slave device setup *******************************************************/
1658 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1659 {
1660         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1661         struct dsa_switch *ds = dp->ds;
1662
1663         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1664         if (!slave_dev->phydev) {
1665                 netdev_err(slave_dev, "no phy at %d\n", addr);
1666                 return -ENODEV;
1667         }
1668
1669         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1670 }
1671
1672 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1673 {
1674         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1675         struct device_node *port_dn = dp->dn;
1676         struct dsa_switch *ds = dp->ds;
1677         phy_interface_t mode;
1678         u32 phy_flags = 0;
1679         int ret;
1680
1681         ret = of_get_phy_mode(port_dn, &mode);
1682         if (ret)
1683                 mode = PHY_INTERFACE_MODE_NA;
1684
1685         dp->pl_config.dev = &slave_dev->dev;
1686         dp->pl_config.type = PHYLINK_NETDEV;
1687
1688         /* The get_fixed_state callback takes precedence over polling the
1689          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1690          * this if the switch provides such a callback.
1691          */
1692         if (ds->ops->phylink_fixed_state) {
1693                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1694                 dp->pl_config.poll_fixed_state = true;
1695         }
1696
1697         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1698                                 &dsa_port_phylink_mac_ops);
1699         if (IS_ERR(dp->pl)) {
1700                 netdev_err(slave_dev,
1701                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1702                 return PTR_ERR(dp->pl);
1703         }
1704
1705         if (ds->ops->get_phy_flags)
1706                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1707
1708         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1709         if (ret == -ENODEV && ds->slave_mii_bus) {
1710                 /* We could not connect to a designated PHY or SFP, so try to
1711                  * use the switch internal MDIO bus instead
1712                  */
1713                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1714                 if (ret) {
1715                         netdev_err(slave_dev,
1716                                    "failed to connect to port %d: %d\n",
1717                                    dp->index, ret);
1718                         phylink_destroy(dp->pl);
1719                         return ret;
1720                 }
1721         }
1722
1723         return ret;
1724 }
1725
1726 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1727 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1728                                             struct netdev_queue *txq,
1729                                             void *_unused)
1730 {
1731         lockdep_set_class(&txq->_xmit_lock,
1732                           &dsa_slave_netdev_xmit_lock_key);
1733 }
1734
1735 int dsa_slave_suspend(struct net_device *slave_dev)
1736 {
1737         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1738
1739         if (!netif_running(slave_dev))
1740                 return 0;
1741
1742         netif_device_detach(slave_dev);
1743
1744         rtnl_lock();
1745         phylink_stop(dp->pl);
1746         rtnl_unlock();
1747
1748         return 0;
1749 }
1750
1751 int dsa_slave_resume(struct net_device *slave_dev)
1752 {
1753         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1754
1755         if (!netif_running(slave_dev))
1756                 return 0;
1757
1758         netif_device_attach(slave_dev);
1759
1760         rtnl_lock();
1761         phylink_start(dp->pl);
1762         rtnl_unlock();
1763
1764         return 0;
1765 }
1766
1767 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1768 {
1769         struct net_device *master = dsa_slave_to_master(dev);
1770         struct dsa_port *dp = dsa_slave_to_port(dev);
1771         struct dsa_notifier_register_info rinfo = {
1772                 .switch_number = dp->ds->index,
1773                 .port_number = dp->index,
1774                 .master = master,
1775                 .info.dev = dev,
1776         };
1777
1778         call_dsa_notifiers(val, dev, &rinfo.info);
1779 }
1780
1781 int dsa_slave_create(struct dsa_port *port)
1782 {
1783         const struct dsa_port *cpu_dp = port->cpu_dp;
1784         struct net_device *master = cpu_dp->master;
1785         struct dsa_switch *ds = port->ds;
1786         const char *name = port->name;
1787         struct net_device *slave_dev;
1788         struct dsa_slave_priv *p;
1789         int ret;
1790
1791         if (!ds->num_tx_queues)
1792                 ds->num_tx_queues = 1;
1793
1794         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1795                                      NET_NAME_UNKNOWN, ether_setup,
1796                                      ds->num_tx_queues, 1);
1797         if (slave_dev == NULL)
1798                 return -ENOMEM;
1799
1800         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1801         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1802                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1803         slave_dev->hw_features |= NETIF_F_HW_TC;
1804         slave_dev->features |= NETIF_F_LLTX;
1805         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1806         if (!IS_ERR_OR_NULL(port->mac))
1807                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1808         else
1809                 eth_hw_addr_inherit(slave_dev, master);
1810         slave_dev->priv_flags |= IFF_NO_QUEUE;
1811         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1812         if (ds->ops->port_max_mtu)
1813                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1814         if (cpu_dp->tag_ops->tail_tag)
1815                 slave_dev->needed_tailroom = cpu_dp->tag_ops->overhead;
1816         else
1817                 slave_dev->needed_headroom = cpu_dp->tag_ops->overhead;
1818         /* Try to save one extra realloc later in the TX path (in the master)
1819          * by also inheriting the master's needed headroom and tailroom.
1820          * The 8021q driver also does this.
1821          */
1822         slave_dev->needed_headroom += master->needed_headroom;
1823         slave_dev->needed_tailroom += master->needed_tailroom;
1824         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1825
1826         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1827                                  NULL);
1828
1829         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1830         slave_dev->dev.of_node = port->dn;
1831         slave_dev->vlan_features = master->vlan_features;
1832
1833         p = netdev_priv(slave_dev);
1834         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1835         if (!slave_dev->tstats) {
1836                 free_netdev(slave_dev);
1837                 return -ENOMEM;
1838         }
1839
1840         ret = gro_cells_init(&p->gcells, slave_dev);
1841         if (ret)
1842                 goto out_free;
1843
1844         p->dp = port;
1845         INIT_LIST_HEAD(&p->mall_tc_list);
1846         p->xmit = cpu_dp->tag_ops->xmit;
1847         port->slave = slave_dev;
1848
1849         rtnl_lock();
1850         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1851         rtnl_unlock();
1852         if (ret && ret != -EOPNOTSUPP)
1853                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1854                          ret, ETH_DATA_LEN, port->index);
1855
1856         netif_carrier_off(slave_dev);
1857
1858         ret = dsa_slave_phy_setup(slave_dev);
1859         if (ret) {
1860                 netdev_err(slave_dev,
1861                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1862                            ret, ds->dst->index, ds->index, port->index);
1863                 goto out_gcells;
1864         }
1865
1866         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1867
1868         rtnl_lock();
1869
1870         ret = register_netdevice(slave_dev);
1871         if (ret) {
1872                 netdev_err(master, "error %d registering interface %s\n",
1873                            ret, slave_dev->name);
1874                 rtnl_unlock();
1875                 goto out_phy;
1876         }
1877
1878         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1879
1880         rtnl_unlock();
1881
1882         if (ret)
1883                 goto out_unregister;
1884
1885         return 0;
1886
1887 out_unregister:
1888         unregister_netdev(slave_dev);
1889 out_phy:
1890         rtnl_lock();
1891         phylink_disconnect_phy(p->dp->pl);
1892         rtnl_unlock();
1893         phylink_destroy(p->dp->pl);
1894 out_gcells:
1895         gro_cells_destroy(&p->gcells);
1896 out_free:
1897         free_percpu(slave_dev->tstats);
1898         free_netdev(slave_dev);
1899         port->slave = NULL;
1900         return ret;
1901 }
1902
1903 void dsa_slave_destroy(struct net_device *slave_dev)
1904 {
1905         struct net_device *master = dsa_slave_to_master(slave_dev);
1906         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1907         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1908
1909         netif_carrier_off(slave_dev);
1910         rtnl_lock();
1911         netdev_upper_dev_unlink(master, slave_dev);
1912         unregister_netdevice(slave_dev);
1913         phylink_disconnect_phy(dp->pl);
1914         rtnl_unlock();
1915
1916         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1917         phylink_destroy(dp->pl);
1918         gro_cells_destroy(&p->gcells);
1919         free_percpu(slave_dev->tstats);
1920         free_netdev(slave_dev);
1921 }
1922
1923 bool dsa_slave_dev_check(const struct net_device *dev)
1924 {
1925         return dev->netdev_ops == &dsa_slave_netdev_ops;
1926 }
1927
1928 static int dsa_slave_changeupper(struct net_device *dev,
1929                                  struct netdev_notifier_changeupper_info *info)
1930 {
1931         struct dsa_port *dp = dsa_slave_to_port(dev);
1932         int err = NOTIFY_DONE;
1933
1934         if (netif_is_bridge_master(info->upper_dev)) {
1935                 if (info->linking) {
1936                         err = dsa_port_bridge_join(dp, info->upper_dev);
1937                         if (!err)
1938                                 dsa_bridge_mtu_normalization(dp);
1939                         err = notifier_from_errno(err);
1940                 } else {
1941                         dsa_port_bridge_leave(dp, info->upper_dev);
1942                         err = NOTIFY_OK;
1943                 }
1944         }
1945
1946         return err;
1947 }
1948
1949 static int
1950 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
1951                                  struct netdev_notifier_changeupper_info *info)
1952 {
1953         struct netlink_ext_ack *ext_ack;
1954         struct net_device *slave;
1955         struct dsa_port *dp;
1956
1957         ext_ack = netdev_notifier_info_to_extack(&info->info);
1958
1959         if (!is_vlan_dev(dev))
1960                 return NOTIFY_DONE;
1961
1962         slave = vlan_dev_real_dev(dev);
1963         if (!dsa_slave_dev_check(slave))
1964                 return NOTIFY_DONE;
1965
1966         dp = dsa_slave_to_port(slave);
1967         if (!dp->bridge_dev)
1968                 return NOTIFY_DONE;
1969
1970         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1971         if (br_vlan_enabled(dp->bridge_dev) &&
1972             netif_is_bridge_master(info->upper_dev) && info->linking) {
1973                 NL_SET_ERR_MSG_MOD(ext_ack,
1974                                    "Cannot enslave VLAN device into VLAN aware bridge");
1975                 return notifier_from_errno(-EINVAL);
1976         }
1977
1978         return NOTIFY_DONE;
1979 }
1980
1981 static int
1982 dsa_slave_check_8021q_upper(struct net_device *dev,
1983                             struct netdev_notifier_changeupper_info *info)
1984 {
1985         struct dsa_port *dp = dsa_slave_to_port(dev);
1986         struct net_device *br = dp->bridge_dev;
1987         struct bridge_vlan_info br_info;
1988         struct netlink_ext_ack *extack;
1989         int err = NOTIFY_DONE;
1990         u16 vid;
1991
1992         if (!br || !br_vlan_enabled(br))
1993                 return NOTIFY_DONE;
1994
1995         extack = netdev_notifier_info_to_extack(&info->info);
1996         vid = vlan_dev_vlan_id(info->upper_dev);
1997
1998         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1999          * device, respectively the VID is not found, returning
2000          * 0 means success, which is a failure for us here.
2001          */
2002         err = br_vlan_get_info(br, vid, &br_info);
2003         if (err == 0) {
2004                 NL_SET_ERR_MSG_MOD(extack,
2005                                    "This VLAN is already configured by the bridge");
2006                 return notifier_from_errno(-EBUSY);
2007         }
2008
2009         return NOTIFY_DONE;
2010 }
2011
2012 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2013                                      unsigned long event, void *ptr)
2014 {
2015         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2016
2017         switch (event) {
2018         case NETDEV_PRECHANGEUPPER: {
2019                 struct netdev_notifier_changeupper_info *info = ptr;
2020                 struct dsa_switch *ds;
2021                 struct dsa_port *dp;
2022                 int err;
2023
2024                 if (!dsa_slave_dev_check(dev))
2025                         return dsa_prevent_bridging_8021q_upper(dev, ptr);
2026
2027                 dp = dsa_slave_to_port(dev);
2028                 ds = dp->ds;
2029
2030                 if (ds->ops->port_prechangeupper) {
2031                         err = ds->ops->port_prechangeupper(ds, dp->index, info);
2032                         if (err)
2033                                 return notifier_from_errno(err);
2034                 }
2035
2036                 if (is_vlan_dev(info->upper_dev))
2037                         return dsa_slave_check_8021q_upper(dev, ptr);
2038                 break;
2039         }
2040         case NETDEV_CHANGEUPPER:
2041                 if (!dsa_slave_dev_check(dev))
2042                         return NOTIFY_DONE;
2043
2044                 return dsa_slave_changeupper(dev, ptr);
2045         }
2046
2047         return NOTIFY_DONE;
2048 }
2049
2050 struct dsa_switchdev_event_work {
2051         struct work_struct work;
2052         struct switchdev_notifier_fdb_info fdb_info;
2053         struct net_device *dev;
2054         unsigned long event;
2055 };
2056
2057 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2058 {
2059         struct dsa_switchdev_event_work *switchdev_work =
2060                 container_of(work, struct dsa_switchdev_event_work, work);
2061         struct net_device *dev = switchdev_work->dev;
2062         struct switchdev_notifier_fdb_info *fdb_info;
2063         struct dsa_port *dp = dsa_slave_to_port(dev);
2064         int err;
2065
2066         rtnl_lock();
2067         switch (switchdev_work->event) {
2068         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2069                 fdb_info = &switchdev_work->fdb_info;
2070                 if (!fdb_info->added_by_user)
2071                         break;
2072
2073                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
2074                 if (err) {
2075                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
2076                         break;
2077                 }
2078                 fdb_info->offloaded = true;
2079                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
2080                                          &fdb_info->info, NULL);
2081                 break;
2082
2083         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2084                 fdb_info = &switchdev_work->fdb_info;
2085                 if (!fdb_info->added_by_user)
2086                         break;
2087
2088                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
2089                 if (err) {
2090                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
2091                         dev_close(dev);
2092                 }
2093                 break;
2094         }
2095         rtnl_unlock();
2096
2097         kfree(switchdev_work->fdb_info.addr);
2098         kfree(switchdev_work);
2099         dev_put(dev);
2100 }
2101
2102 static int
2103 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
2104                                   switchdev_work,
2105                                   const struct switchdev_notifier_fdb_info *
2106                                   fdb_info)
2107 {
2108         memcpy(&switchdev_work->fdb_info, fdb_info,
2109                sizeof(switchdev_work->fdb_info));
2110         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
2111         if (!switchdev_work->fdb_info.addr)
2112                 return -ENOMEM;
2113         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
2114                         fdb_info->addr);
2115         return 0;
2116 }
2117
2118 /* Called under rcu_read_lock() */
2119 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2120                                      unsigned long event, void *ptr)
2121 {
2122         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2123         struct dsa_switchdev_event_work *switchdev_work;
2124         int err;
2125
2126         if (event == SWITCHDEV_PORT_ATTR_SET) {
2127                 err = switchdev_handle_port_attr_set(dev, ptr,
2128                                                      dsa_slave_dev_check,
2129                                                      dsa_slave_port_attr_set);
2130                 return notifier_from_errno(err);
2131         }
2132
2133         if (!dsa_slave_dev_check(dev))
2134                 return NOTIFY_DONE;
2135
2136         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2137         if (!switchdev_work)
2138                 return NOTIFY_BAD;
2139
2140         INIT_WORK(&switchdev_work->work,
2141                   dsa_slave_switchdev_event_work);
2142         switchdev_work->dev = dev;
2143         switchdev_work->event = event;
2144
2145         switch (event) {
2146         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2147         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2148                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
2149                         goto err_fdb_work_init;
2150                 dev_hold(dev);
2151                 break;
2152         default:
2153                 kfree(switchdev_work);
2154                 return NOTIFY_DONE;
2155         }
2156
2157         dsa_schedule_work(&switchdev_work->work);
2158         return NOTIFY_OK;
2159
2160 err_fdb_work_init:
2161         kfree(switchdev_work);
2162         return NOTIFY_BAD;
2163 }
2164
2165 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2166                                               unsigned long event, void *ptr)
2167 {
2168         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2169         int err;
2170
2171         switch (event) {
2172         case SWITCHDEV_PORT_OBJ_ADD:
2173                 err = switchdev_handle_port_obj_add(dev, ptr,
2174                                                     dsa_slave_dev_check,
2175                                                     dsa_slave_port_obj_add);
2176                 return notifier_from_errno(err);
2177         case SWITCHDEV_PORT_OBJ_DEL:
2178                 err = switchdev_handle_port_obj_del(dev, ptr,
2179                                                     dsa_slave_dev_check,
2180                                                     dsa_slave_port_obj_del);
2181                 return notifier_from_errno(err);
2182         case SWITCHDEV_PORT_ATTR_SET:
2183                 err = switchdev_handle_port_attr_set(dev, ptr,
2184                                                      dsa_slave_dev_check,
2185                                                      dsa_slave_port_attr_set);
2186                 return notifier_from_errno(err);
2187         }
2188
2189         return NOTIFY_DONE;
2190 }
2191
2192 static struct notifier_block dsa_slave_nb __read_mostly = {
2193         .notifier_call  = dsa_slave_netdevice_event,
2194 };
2195
2196 static struct notifier_block dsa_slave_switchdev_notifier = {
2197         .notifier_call = dsa_slave_switchdev_event,
2198 };
2199
2200 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2201         .notifier_call = dsa_slave_switchdev_blocking_event,
2202 };
2203
2204 int dsa_slave_register_notifier(void)
2205 {
2206         struct notifier_block *nb;
2207         int err;
2208
2209         err = register_netdevice_notifier(&dsa_slave_nb);
2210         if (err)
2211                 return err;
2212
2213         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2214         if (err)
2215                 goto err_switchdev_nb;
2216
2217         nb = &dsa_slave_switchdev_blocking_notifier;
2218         err = register_switchdev_blocking_notifier(nb);
2219         if (err)
2220                 goto err_switchdev_blocking_nb;
2221
2222         return 0;
2223
2224 err_switchdev_blocking_nb:
2225         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2226 err_switchdev_nb:
2227         unregister_netdevice_notifier(&dsa_slave_nb);
2228         return err;
2229 }
2230
2231 void dsa_slave_unregister_notifier(void)
2232 {
2233         struct notifier_block *nb;
2234         int err;
2235
2236         nb = &dsa_slave_switchdev_blocking_notifier;
2237         err = unregister_switchdev_blocking_notifier(nb);
2238         if (err)
2239                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2240
2241         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2242         if (err)
2243                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2244
2245         err = unregister_netdevice_notifier(&dsa_slave_nb);
2246         if (err)
2247                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2248 }