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         DSA_SKB_CB(skb)->clone = clone;
 526
 527         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type))
 528                 return;
 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 pcpu_sw_netstats *s;
 579         struct sk_buff *nskb;
 580
 581         s = this_cpu_ptr(p->stats64);
 582         u64_stats_update_begin(&s->syncp);
 583         s->tx_packets++;
 584         s->tx_bytes += skb->len;
 585         u64_stats_update_end(&s->syncp);
 586
 587         DSA_SKB_CB(skb)->clone = NULL;
 588
 589         /* Identify PTP protocol packets, clone them, and pass them to the
 590          * switch driver
 591          */
 592         dsa_skb_tx_timestamp(p, skb);
 593
 594         if (dsa_realloc_skb(skb, dev)) {
 595                 dev_kfree_skb_any(skb);
 596                 return NETDEV_TX_OK;
 597         }
 598
 599         /* needed_tailroom should still be 'warm' in the cache line from
 600          * dsa_realloc_skb(), which has also ensured that padding is safe.
 601          */
 602         if (dev->needed_tailroom)
 603                 eth_skb_pad(skb);
 604
 605         /* Transmit function may have to reallocate the original SKB,
 606          * in which case it must have freed it. Only free it here on error.
 607          */
 608         nskb = p->xmit(skb, dev);
 609         if (!nskb) {
 610                 kfree_skb(skb);
 611                 return NETDEV_TX_OK;
 612         }
 613
 614         return dsa_enqueue_skb(nskb, dev);
 615 }
 616
 617 /* ethtool operations *******************************************************/
 618
 619 static void dsa_slave_get_drvinfo(struct net_device *dev,
 620                                   struct ethtool_drvinfo *drvinfo)
 621 {
 622         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 623         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 624         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 625 }
 626
 627 static int dsa_slave_get_regs_len(struct net_device *dev)
 628 {
 629         struct dsa_port *dp = dsa_slave_to_port(dev);
 630         struct dsa_switch *ds = dp->ds;
 631
 632         if (ds->ops->get_regs_len)
 633                 return ds->ops->get_regs_len(ds, dp->index);
 634
 635         return -EOPNOTSUPP;
 636 }
 637
 638 static void
 639 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 640 {
 641         struct dsa_port *dp = dsa_slave_to_port(dev);
 642         struct dsa_switch *ds = dp->ds;
 643
 644         if (ds->ops->get_regs)
 645                 ds->ops->get_regs(ds, dp->index, regs, _p);
 646 }
 647
 648 static int dsa_slave_nway_reset(struct net_device *dev)
 649 {
 650         struct dsa_port *dp = dsa_slave_to_port(dev);
 651
 652         return phylink_ethtool_nway_reset(dp->pl);
 653 }
 654
 655 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 656 {
 657         struct dsa_port *dp = dsa_slave_to_port(dev);
 658         struct dsa_switch *ds = dp->ds;
 659
 660         if (ds->cd && ds->cd->eeprom_len)
 661                 return ds->cd->eeprom_len;
 662
 663         if (ds->ops->get_eeprom_len)
 664                 return ds->ops->get_eeprom_len(ds);
 665
 666         return 0;
 667 }
 668
 669 static int dsa_slave_get_eeprom(struct net_device *dev,
 670                                 struct ethtool_eeprom *eeprom, u8 *data)
 671 {
 672         struct dsa_port *dp = dsa_slave_to_port(dev);
 673         struct dsa_switch *ds = dp->ds;
 674
 675         if (ds->ops->get_eeprom)
 676                 return ds->ops->get_eeprom(ds, eeprom, data);
 677
 678         return -EOPNOTSUPP;
 679 }
 680
 681 static int dsa_slave_set_eeprom(struct net_device *dev,
 682                                 struct ethtool_eeprom *eeprom, u8 *data)
 683 {
 684         struct dsa_port *dp = dsa_slave_to_port(dev);
 685         struct dsa_switch *ds = dp->ds;
 686
 687         if (ds->ops->set_eeprom)
 688                 return ds->ops->set_eeprom(ds, eeprom, data);
 689
 690         return -EOPNOTSUPP;
 691 }
 692
 693 static void dsa_slave_get_strings(struct net_device *dev,
 694                                   uint32_t stringset, uint8_t *data)
 695 {
 696         struct dsa_port *dp = dsa_slave_to_port(dev);
 697         struct dsa_switch *ds = dp->ds;
 698
 699         if (stringset == ETH_SS_STATS) {
 700                 int len = ETH_GSTRING_LEN;
 701
 702                 strncpy(data, "tx_packets", len);
 703                 strncpy(data + len, "tx_bytes", len);
 704                 strncpy(data + 2 * len, "rx_packets", len);
 705                 strncpy(data + 3 * len, "rx_bytes", len);
 706                 if (ds->ops->get_strings)
 707                         ds->ops->get_strings(ds, dp->index, stringset,
 708                                              data + 4 * len);
 709         }
 710 }
 711
 712 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 713                                         struct ethtool_stats *stats,
 714                                         uint64_t *data)
 715 {
 716         struct dsa_port *dp = dsa_slave_to_port(dev);
 717         struct dsa_slave_priv *p = netdev_priv(dev);
 718         struct dsa_switch *ds = dp->ds;
 719         struct pcpu_sw_netstats *s;
 720         unsigned int start;
 721         int i;
 722
 723         for_each_possible_cpu(i) {
 724                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 725
 726                 s = per_cpu_ptr(p->stats64, i);
 727                 do {
 728                         start = u64_stats_fetch_begin_irq(&s->syncp);
 729                         tx_packets = s->tx_packets;
 730                         tx_bytes = s->tx_bytes;
 731                         rx_packets = s->rx_packets;
 732                         rx_bytes = s->rx_bytes;
 733                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 734                 data[0] += tx_packets;
 735                 data[1] += tx_bytes;
 736                 data[2] += rx_packets;
 737                 data[3] += rx_bytes;
 738         }
 739         if (ds->ops->get_ethtool_stats)
 740                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 741 }
 742
 743 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 744 {
 745         struct dsa_port *dp = dsa_slave_to_port(dev);
 746         struct dsa_switch *ds = dp->ds;
 747
 748         if (sset == ETH_SS_STATS) {
 749                 int count = 0;
 750
 751                 if (ds->ops->get_sset_count) {
 752                         count = ds->ops->get_sset_count(ds, dp->index, sset);
 753                         if (count < 0)
 754                                 return count;
 755                 }
 756
 757                 return count + 4;
 758         }
 759
 760         return -EOPNOTSUPP;
 761 }
 762
 763 static void dsa_slave_get_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
 768         phylink_ethtool_get_wol(dp->pl, w);
 769
 770         if (ds->ops->get_wol)
 771                 ds->ops->get_wol(ds, dp->index, w);
 772 }
 773
 774 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 775 {
 776         struct dsa_port *dp = dsa_slave_to_port(dev);
 777         struct dsa_switch *ds = dp->ds;
 778         int ret = -EOPNOTSUPP;
 779
 780         phylink_ethtool_set_wol(dp->pl, w);
 781
 782         if (ds->ops->set_wol)
 783                 ret = ds->ops->set_wol(ds, dp->index, w);
 784
 785         return ret;
 786 }
 787
 788 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 789 {
 790         struct dsa_port *dp = dsa_slave_to_port(dev);
 791         struct dsa_switch *ds = dp->ds;
 792         int ret;
 793
 794         /* Port's PHY and MAC both need to be EEE capable */
 795         if (!dev->phydev || !dp->pl)
 796                 return -ENODEV;
 797
 798         if (!ds->ops->set_mac_eee)
 799                 return -EOPNOTSUPP;
 800
 801         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 802         if (ret)
 803                 return ret;
 804
 805         return phylink_ethtool_set_eee(dp->pl, e);
 806 }
 807
 808 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 809 {
 810         struct dsa_port *dp = dsa_slave_to_port(dev);
 811         struct dsa_switch *ds = dp->ds;
 812         int ret;
 813
 814         /* Port's PHY and MAC both need to be EEE capable */
 815         if (!dev->phydev || !dp->pl)
 816                 return -ENODEV;
 817
 818         if (!ds->ops->get_mac_eee)
 819                 return -EOPNOTSUPP;
 820
 821         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 822         if (ret)
 823                 return ret;
 824
 825         return phylink_ethtool_get_eee(dp->pl, e);
 826 }
 827
 828 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 829                                         struct ethtool_link_ksettings *cmd)
 830 {
 831         struct dsa_port *dp = dsa_slave_to_port(dev);
 832
 833         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 834 }
 835
 836 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 837                                         const struct ethtool_link_ksettings *cmd)
 838 {
 839         struct dsa_port *dp = dsa_slave_to_port(dev);
 840
 841         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 842 }
 843
 844 static void dsa_slave_get_pauseparam(struct net_device *dev,
 845                                      struct ethtool_pauseparam *pause)
 846 {
 847         struct dsa_port *dp = dsa_slave_to_port(dev);
 848
 849         phylink_ethtool_get_pauseparam(dp->pl, pause);
 850 }
 851
 852 static int dsa_slave_set_pauseparam(struct net_device *dev,
 853                                     struct ethtool_pauseparam *pause)
 854 {
 855         struct dsa_port *dp = dsa_slave_to_port(dev);
 856
 857         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 858 }
 859
 860 #ifdef CONFIG_NET_POLL_CONTROLLER
 861 static int dsa_slave_netpoll_setup(struct net_device *dev,
 862                                    struct netpoll_info *ni)
 863 {
 864         struct net_device *master = dsa_slave_to_master(dev);
 865         struct dsa_slave_priv *p = netdev_priv(dev);
 866         struct netpoll *netpoll;
 867         int err = 0;
 868
 869         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 870         if (!netpoll)
 871                 return -ENOMEM;
 872
 873         err = __netpoll_setup(netpoll, master);
 874         if (err) {
 875                 kfree(netpoll);
 876                 goto out;
 877         }
 878
 879         p->netpoll = netpoll;
 880 out:
 881         return err;
 882 }
 883
 884 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 885 {
 886         struct dsa_slave_priv *p = netdev_priv(dev);
 887         struct netpoll *netpoll = p->netpoll;
 888
 889         if (!netpoll)
 890                 return;
 891
 892         p->netpoll = NULL;
 893
 894         __netpoll_free(netpoll);
 895 }
 896
 897 static void dsa_slave_poll_controller(struct net_device *dev)
 898 {
 899 }
 900 #endif
 901
 902 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 903                                         char *name, size_t len)
 904 {
 905         struct dsa_port *dp = dsa_slave_to_port(dev);
 906
 907         /* For non-legacy ports, devlink is used and it takes
 908          * care of the name generation. This ndo implementation
 909          * should be removed with legacy support.
 910          */
 911         if (dp->ds->devlink)
 912                 return -EOPNOTSUPP;
 913
 914         if (snprintf(name, len, "p%d", dp->index) >= len)
 915                 return -EINVAL;
 916
 917         return 0;
 918 }
 919
 920 static struct dsa_mall_tc_entry *
 921 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 922 {
 923         struct dsa_slave_priv *p = netdev_priv(dev);
 924         struct dsa_mall_tc_entry *mall_tc_entry;
 925
 926         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 927                 if (mall_tc_entry->cookie == cookie)
 928                         return mall_tc_entry;
 929
 930         return NULL;
 931 }
 932
 933 static int
 934 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 935                                   struct tc_cls_matchall_offload *cls,
 936                                   bool ingress)
 937 {
 938         struct dsa_port *dp = dsa_slave_to_port(dev);
 939         struct dsa_slave_priv *p = netdev_priv(dev);
 940         struct dsa_mall_mirror_tc_entry *mirror;
 941         struct dsa_mall_tc_entry *mall_tc_entry;
 942         struct dsa_switch *ds = dp->ds;
 943         struct flow_action_entry *act;
 944         struct dsa_port *to_dp;
 945         int err;
 946
 947         if (!ds->ops->port_mirror_add)
 948                 return -EOPNOTSUPP;
 949
 950         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 951                                               cls->common.extack))
 952                 return -EOPNOTSUPP;
 953
 954         act = &cls->rule->action.entries[0];
 955
 956         if (!act->dev)
 957                 return -EINVAL;
 958
 959         if (!dsa_slave_dev_check(act->dev))
 960                 return -EOPNOTSUPP;
 961
 962         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 963         if (!mall_tc_entry)
 964                 return -ENOMEM;
 965
 966         mall_tc_entry->cookie = cls->cookie;
 967         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 968         mirror = &mall_tc_entry->mirror;
 969
 970         to_dp = dsa_slave_to_port(act->dev);
 971
 972         mirror->to_local_port = to_dp->index;
 973         mirror->ingress = ingress;
 974
 975         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 976         if (err) {
 977                 kfree(mall_tc_entry);
 978                 return err;
 979         }
 980
 981         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 982
 983         return err;
 984 }
 985
 986 static int
 987 dsa_slave_add_cls_matchall_police(struct net_device *dev,
 988                                   struct tc_cls_matchall_offload *cls,
 989                                   bool ingress)
 990 {
 991         struct netlink_ext_ack *extack = cls->common.extack;
 992         struct dsa_port *dp = dsa_slave_to_port(dev);
 993         struct dsa_slave_priv *p = netdev_priv(dev);
 994         struct dsa_mall_policer_tc_entry *policer;
 995         struct dsa_mall_tc_entry *mall_tc_entry;
 996         struct dsa_switch *ds = dp->ds;
 997         struct flow_action_entry *act;
 998         int err;
 999
1000         if (!ds->ops->port_policer_add) {
1001                 NL_SET_ERR_MSG_MOD(extack,
1002                                    "Policing offload not implemented");
1003                 return -EOPNOTSUPP;
1004         }
1005
1006         if (!ingress) {
1007                 NL_SET_ERR_MSG_MOD(extack,
1008                                    "Only supported on ingress qdisc");
1009                 return -EOPNOTSUPP;
1010         }
1011
1012         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1013                                               cls->common.extack))
1014                 return -EOPNOTSUPP;
1015
1016         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1017                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1018                         NL_SET_ERR_MSG_MOD(extack,
1019                                            "Only one port policer allowed");
1020                         return -EEXIST;
1021                 }
1022         }
1023
1024         act = &cls->rule->action.entries[0];
1025
1026         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1027         if (!mall_tc_entry)
1028                 return -ENOMEM;
1029
1030         mall_tc_entry->cookie = cls->cookie;
1031         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1032         policer = &mall_tc_entry->policer;
1033         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1034         policer->burst = act->police.burst;
1035
1036         err = ds->ops->port_policer_add(ds, dp->index, policer);
1037         if (err) {
1038                 kfree(mall_tc_entry);
1039                 return err;
1040         }
1041
1042         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1043
1044         return err;
1045 }
1046
1047 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1048                                       struct tc_cls_matchall_offload *cls,
1049                                       bool ingress)
1050 {
1051         int err = -EOPNOTSUPP;
1052
1053         if (cls->common.protocol == htons(ETH_P_ALL) &&
1054             flow_offload_has_one_action(&cls->rule->action) &&
1055             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1056                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1057         else if (flow_offload_has_one_action(&cls->rule->action) &&
1058                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1059                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1060
1061         return err;
1062 }
1063
1064 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1065                                        struct tc_cls_matchall_offload *cls)
1066 {
1067         struct dsa_port *dp = dsa_slave_to_port(dev);
1068         struct dsa_mall_tc_entry *mall_tc_entry;
1069         struct dsa_switch *ds = dp->ds;
1070
1071         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1072         if (!mall_tc_entry)
1073                 return;
1074
1075         list_del(&mall_tc_entry->list);
1076
1077         switch (mall_tc_entry->type) {
1078         case DSA_PORT_MALL_MIRROR:
1079                 if (ds->ops->port_mirror_del)
1080                         ds->ops->port_mirror_del(ds, dp->index,
1081                                                  &mall_tc_entry->mirror);
1082                 break;
1083         case DSA_PORT_MALL_POLICER:
1084                 if (ds->ops->port_policer_del)
1085                         ds->ops->port_policer_del(ds, dp->index);
1086                 break;
1087         default:
1088                 WARN_ON(1);
1089         }
1090
1091         kfree(mall_tc_entry);
1092 }
1093
1094 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1095                                            struct tc_cls_matchall_offload *cls,
1096                                            bool ingress)
1097 {
1098         if (cls->common.chain_index)
1099                 return -EOPNOTSUPP;
1100
1101         switch (cls->command) {
1102         case TC_CLSMATCHALL_REPLACE:
1103                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1104         case TC_CLSMATCHALL_DESTROY:
1105                 dsa_slave_del_cls_matchall(dev, cls);
1106                 return 0;
1107         default:
1108                 return -EOPNOTSUPP;
1109         }
1110 }
1111
1112 static int dsa_slave_add_cls_flower(struct net_device *dev,
1113                                     struct flow_cls_offload *cls,
1114                                     bool ingress)
1115 {
1116         struct dsa_port *dp = dsa_slave_to_port(dev);
1117         struct dsa_switch *ds = dp->ds;
1118         int port = dp->index;
1119
1120         if (!ds->ops->cls_flower_add)
1121                 return -EOPNOTSUPP;
1122
1123         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1124 }
1125
1126 static int dsa_slave_del_cls_flower(struct net_device *dev,
1127                                     struct flow_cls_offload *cls,
1128                                     bool ingress)
1129 {
1130         struct dsa_port *dp = dsa_slave_to_port(dev);
1131         struct dsa_switch *ds = dp->ds;
1132         int port = dp->index;
1133
1134         if (!ds->ops->cls_flower_del)
1135                 return -EOPNOTSUPP;
1136
1137         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1138 }
1139
1140 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1141                                       struct flow_cls_offload *cls,
1142                                       bool ingress)
1143 {
1144         struct dsa_port *dp = dsa_slave_to_port(dev);
1145         struct dsa_switch *ds = dp->ds;
1146         int port = dp->index;
1147
1148         if (!ds->ops->cls_flower_stats)
1149                 return -EOPNOTSUPP;
1150
1151         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1152 }
1153
1154 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1155                                          struct flow_cls_offload *cls,
1156                                          bool ingress)
1157 {
1158         switch (cls->command) {
1159         case FLOW_CLS_REPLACE:
1160                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1161         case FLOW_CLS_DESTROY:
1162                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1163         case FLOW_CLS_STATS:
1164                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1165         default:
1166                 return -EOPNOTSUPP;
1167         }
1168 }
1169
1170 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1171                                        void *cb_priv, bool ingress)
1172 {
1173         struct net_device *dev = cb_priv;
1174
1175         if (!tc_can_offload(dev))
1176                 return -EOPNOTSUPP;
1177
1178         switch (type) {
1179         case TC_SETUP_CLSMATCHALL:
1180                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1181         case TC_SETUP_CLSFLOWER:
1182                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1183         default:
1184                 return -EOPNOTSUPP;
1185         }
1186 }
1187
1188 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1189                                           void *type_data, void *cb_priv)
1190 {
1191         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1192 }
1193
1194 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1195                                           void *type_data, void *cb_priv)
1196 {
1197         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1198 }
1199
1200 static LIST_HEAD(dsa_slave_block_cb_list);
1201
1202 static int dsa_slave_setup_tc_block(struct net_device *dev,
1203                                     struct flow_block_offload *f)
1204 {
1205         struct flow_block_cb *block_cb;
1206         flow_setup_cb_t *cb;
1207
1208         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1209                 cb = dsa_slave_setup_tc_block_cb_ig;
1210         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1211                 cb = dsa_slave_setup_tc_block_cb_eg;
1212         else
1213                 return -EOPNOTSUPP;
1214
1215         f->driver_block_list = &dsa_slave_block_cb_list;
1216
1217         switch (f->command) {
1218         case FLOW_BLOCK_BIND:
1219                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1220                         return -EBUSY;
1221
1222                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1223                 if (IS_ERR(block_cb))
1224                         return PTR_ERR(block_cb);
1225
1226                 flow_block_cb_add(block_cb, f);
1227                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1228                 return 0;
1229         case FLOW_BLOCK_UNBIND:
1230                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1231                 if (!block_cb)
1232                         return -ENOENT;
1233
1234                 flow_block_cb_remove(block_cb, f);
1235                 list_del(&block_cb->driver_list);
1236                 return 0;
1237         default:
1238                 return -EOPNOTSUPP;
1239         }
1240 }
1241
1242 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1243                               void *type_data)
1244 {
1245         struct dsa_port *dp = dsa_slave_to_port(dev);
1246         struct dsa_switch *ds = dp->ds;
1247
1248         if (type == TC_SETUP_BLOCK)
1249                 return dsa_slave_setup_tc_block(dev, type_data);
1250
1251         if (!ds->ops->port_setup_tc)
1252                 return -EOPNOTSUPP;
1253
1254         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1255 }
1256
1257 static void dsa_slave_get_stats64(struct net_device *dev,
1258                                   struct rtnl_link_stats64 *stats)
1259 {
1260         struct dsa_slave_priv *p = netdev_priv(dev);
1261
1262         netdev_stats_to_stats64(stats, &dev->stats);
1263         dev_fetch_sw_netstats(stats, p->stats64);
1264 }
1265
1266 static int dsa_slave_get_rxnfc(struct net_device *dev,
1267                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1268 {
1269         struct dsa_port *dp = dsa_slave_to_port(dev);
1270         struct dsa_switch *ds = dp->ds;
1271
1272         if (!ds->ops->get_rxnfc)
1273                 return -EOPNOTSUPP;
1274
1275         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1276 }
1277
1278 static int dsa_slave_set_rxnfc(struct net_device *dev,
1279                                struct ethtool_rxnfc *nfc)
1280 {
1281         struct dsa_port *dp = dsa_slave_to_port(dev);
1282         struct dsa_switch *ds = dp->ds;
1283
1284         if (!ds->ops->set_rxnfc)
1285                 return -EOPNOTSUPP;
1286
1287         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1288 }
1289
1290 static int dsa_slave_get_ts_info(struct net_device *dev,
1291                                  struct ethtool_ts_info *ts)
1292 {
1293         struct dsa_slave_priv *p = netdev_priv(dev);
1294         struct dsa_switch *ds = p->dp->ds;
1295
1296         if (!ds->ops->get_ts_info)
1297                 return -EOPNOTSUPP;
1298
1299         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1300 }
1301
1302 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1303                                      u16 vid)
1304 {
1305         struct net_device *master = dsa_slave_to_master(dev);
1306         struct dsa_port *dp = dsa_slave_to_port(dev);
1307         struct switchdev_obj_port_vlan vlan = {
1308                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1309                 .vid_begin = vid,
1310                 .vid_end = vid,
1311                 /* This API only allows programming tagged, non-PVID VIDs */
1312                 .flags = 0,
1313         };
1314         struct switchdev_trans trans;
1315         int ret;
1316
1317         /* User port... */
1318         trans.ph_prepare = true;
1319         ret = dsa_port_vlan_add(dp, &vlan, &trans);
1320         if (ret)
1321                 return ret;
1322
1323         trans.ph_prepare = false;
1324         ret = dsa_port_vlan_add(dp, &vlan, &trans);
1325         if (ret)
1326                 return ret;
1327
1328         /* And CPU port... */
1329         trans.ph_prepare = true;
1330         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &trans);
1331         if (ret)
1332                 return ret;
1333
1334         trans.ph_prepare = false;
1335         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &trans);
1336         if (ret)
1337                 return ret;
1338
1339         return vlan_vid_add(master, proto, vid);
1340 }
1341
1342 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1343                                       u16 vid)
1344 {
1345         struct net_device *master = dsa_slave_to_master(dev);
1346         struct dsa_port *dp = dsa_slave_to_port(dev);
1347         struct switchdev_obj_port_vlan vlan = {
1348                 .vid_begin = vid,
1349                 .vid_end = vid,
1350                 /* This API only allows programming tagged, non-PVID VIDs */
1351                 .flags = 0,
1352         };
1353         int err;
1354
1355         /* Do not deprogram the CPU port as it may be shared with other user
1356          * ports which can be members of this VLAN as well.
1357          */
1358         err = dsa_port_vlan_del(dp, &vlan);
1359         if (err)
1360                 return err;
1361
1362         vlan_vid_del(master, proto, vid);
1363
1364         return 0;
1365 }
1366
1367 struct dsa_hw_port {
1368         struct list_head list;
1369         struct net_device *dev;
1370         int old_mtu;
1371 };
1372
1373 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1374 {
1375         const struct dsa_hw_port *p;
1376         int err;
1377
1378         list_for_each_entry(p, hw_port_list, list) {
1379                 if (p->dev->mtu == mtu)
1380                         continue;
1381
1382                 err = dev_set_mtu(p->dev, mtu);
1383                 if (err)
1384                         goto rollback;
1385         }
1386
1387         return 0;
1388
1389 rollback:
1390         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1391                 if (p->dev->mtu == p->old_mtu)
1392                         continue;
1393
1394                 if (dev_set_mtu(p->dev, p->old_mtu))
1395                         netdev_err(p->dev, "Failed to restore MTU\n");
1396         }
1397
1398         return err;
1399 }
1400
1401 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1402 {
1403         struct dsa_hw_port *p, *n;
1404
1405         list_for_each_entry_safe(p, n, hw_port_list, list)
1406                 kfree(p);
1407 }
1408
1409 /* Make the hardware datapath to/from @dev limited to a common MTU */
1410 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1411 {
1412         struct list_head hw_port_list;
1413         struct dsa_switch_tree *dst;
1414         int min_mtu = ETH_MAX_MTU;
1415         struct dsa_port *other_dp;
1416         int err;
1417
1418         if (!dp->ds->mtu_enforcement_ingress)
1419                 return;
1420
1421         if (!dp->bridge_dev)
1422                 return;
1423
1424         INIT_LIST_HEAD(&hw_port_list);
1425
1426         /* Populate the list of ports that are part of the same bridge
1427          * as the newly added/modified port
1428          */
1429         list_for_each_entry(dst, &dsa_tree_list, list) {
1430                 list_for_each_entry(other_dp, &dst->ports, list) {
1431                         struct dsa_hw_port *hw_port;
1432                         struct net_device *slave;
1433
1434                         if (other_dp->type != DSA_PORT_TYPE_USER)
1435                                 continue;
1436
1437                         if (other_dp->bridge_dev != dp->bridge_dev)
1438                                 continue;
1439
1440                         if (!other_dp->ds->mtu_enforcement_ingress)
1441                                 continue;
1442
1443                         slave = other_dp->slave;
1444
1445                         if (min_mtu > slave->mtu)
1446                                 min_mtu = slave->mtu;
1447
1448                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1449                         if (!hw_port)
1450                                 goto out;
1451
1452                         hw_port->dev = slave;
1453                         hw_port->old_mtu = slave->mtu;
1454
1455                         list_add(&hw_port->list, &hw_port_list);
1456                 }
1457         }
1458
1459         /* Attempt to configure the entire hardware bridge to the newly added
1460          * interface's MTU first, regardless of whether the intention of the
1461          * user was to raise or lower it.
1462          */
1463         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1464         if (!err)
1465                 goto out;
1466
1467         /* Clearly that didn't work out so well, so just set the minimum MTU on
1468          * all hardware bridge ports now. If this fails too, then all ports will
1469          * still have their old MTU rolled back anyway.
1470          */
1471         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1472
1473 out:
1474         dsa_hw_port_list_free(&hw_port_list);
1475 }
1476
1477 static int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1478 {
1479         struct net_device *master = dsa_slave_to_master(dev);
1480         struct dsa_port *dp = dsa_slave_to_port(dev);
1481         struct dsa_slave_priv *p = netdev_priv(dev);
1482         struct dsa_switch *ds = p->dp->ds;
1483         struct dsa_port *cpu_dp;
1484         int port = p->dp->index;
1485         int largest_mtu = 0;
1486         int new_master_mtu;
1487         int old_master_mtu;
1488         int mtu_limit;
1489         int cpu_mtu;
1490         int err, i;
1491
1492         if (!ds->ops->port_change_mtu)
1493                 return -EOPNOTSUPP;
1494
1495         for (i = 0; i < ds->num_ports; i++) {
1496                 int slave_mtu;
1497
1498                 if (!dsa_is_user_port(ds, i))
1499                         continue;
1500
1501                 /* During probe, this function will be called for each slave
1502                  * device, while not all of them have been allocated. That's
1503                  * ok, it doesn't change what the maximum is, so ignore it.
1504                  */
1505                 if (!dsa_to_port(ds, i)->slave)
1506                         continue;
1507
1508                 /* Pretend that we already applied the setting, which we
1509                  * actually haven't (still haven't done all integrity checks)
1510                  */
1511                 if (i == port)
1512                         slave_mtu = new_mtu;
1513                 else
1514                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1515
1516                 if (largest_mtu < slave_mtu)
1517                         largest_mtu = slave_mtu;
1518         }
1519
1520         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1521
1522         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1523         old_master_mtu = master->mtu;
1524         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1525         if (new_master_mtu > mtu_limit)
1526                 return -ERANGE;
1527
1528         /* If the master MTU isn't over limit, there's no need to check the CPU
1529          * MTU, since that surely isn't either.
1530          */
1531         cpu_mtu = largest_mtu;
1532
1533         /* Start applying stuff */
1534         if (new_master_mtu != old_master_mtu) {
1535                 err = dev_set_mtu(master, new_master_mtu);
1536                 if (err < 0)
1537                         goto out_master_failed;
1538
1539                 /* We only need to propagate the MTU of the CPU port to
1540                  * upstream switches.
1541                  */
1542                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1543                 if (err)
1544                         goto out_cpu_failed;
1545         }
1546
1547         err = dsa_port_mtu_change(dp, new_mtu, false);
1548         if (err)
1549                 goto out_port_failed;
1550
1551         dev->mtu = new_mtu;
1552
1553         dsa_bridge_mtu_normalization(dp);
1554
1555         return 0;
1556
1557 out_port_failed:
1558         if (new_master_mtu != old_master_mtu)
1559                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1560                                     cpu_dp->tag_ops->overhead,
1561                                     true);
1562 out_cpu_failed:
1563         if (new_master_mtu != old_master_mtu)
1564                 dev_set_mtu(master, old_master_mtu);
1565 out_master_failed:
1566         return err;
1567 }
1568
1569 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1570         .get_drvinfo            = dsa_slave_get_drvinfo,
1571         .get_regs_len           = dsa_slave_get_regs_len,
1572         .get_regs               = dsa_slave_get_regs,
1573         .nway_reset             = dsa_slave_nway_reset,
1574         .get_link               = ethtool_op_get_link,
1575         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1576         .get_eeprom             = dsa_slave_get_eeprom,
1577         .set_eeprom             = dsa_slave_set_eeprom,
1578         .get_strings            = dsa_slave_get_strings,
1579         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1580         .get_sset_count         = dsa_slave_get_sset_count,
1581         .set_wol                = dsa_slave_set_wol,
1582         .get_wol                = dsa_slave_get_wol,
1583         .set_eee                = dsa_slave_set_eee,
1584         .get_eee                = dsa_slave_get_eee,
1585         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1586         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1587         .get_pauseparam         = dsa_slave_get_pauseparam,
1588         .set_pauseparam         = dsa_slave_set_pauseparam,
1589         .get_rxnfc              = dsa_slave_get_rxnfc,
1590         .set_rxnfc              = dsa_slave_set_rxnfc,
1591         .get_ts_info            = dsa_slave_get_ts_info,
1592 };
1593
1594 /* legacy way, bypassing the bridge *****************************************/
1595 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1596                        struct net_device *dev,
1597                        const unsigned char *addr, u16 vid,
1598                        u16 flags,
1599                        struct netlink_ext_ack *extack)
1600 {
1601         struct dsa_port *dp = dsa_slave_to_port(dev);
1602
1603         return dsa_port_fdb_add(dp, addr, vid);
1604 }
1605
1606 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1607                        struct net_device *dev,
1608                        const unsigned char *addr, u16 vid)
1609 {
1610         struct dsa_port *dp = dsa_slave_to_port(dev);
1611
1612         return dsa_port_fdb_del(dp, addr, vid);
1613 }
1614
1615 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1616 {
1617         struct dsa_port *dp = dsa_slave_to_port(dev);
1618
1619         return dp->ds->devlink ? &dp->devlink_port : NULL;
1620 }
1621
1622 static const struct net_device_ops dsa_slave_netdev_ops = {
1623         .ndo_open               = dsa_slave_open,
1624         .ndo_stop               = dsa_slave_close,
1625         .ndo_start_xmit         = dsa_slave_xmit,
1626         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1627         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1628         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1629         .ndo_fdb_add            = dsa_legacy_fdb_add,
1630         .ndo_fdb_del            = dsa_legacy_fdb_del,
1631         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1632         .ndo_do_ioctl           = dsa_slave_ioctl,
1633         .ndo_get_iflink         = dsa_slave_get_iflink,
1634 #ifdef CONFIG_NET_POLL_CONTROLLER
1635         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1636         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1637         .ndo_poll_controller    = dsa_slave_poll_controller,
1638 #endif
1639         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1640         .ndo_setup_tc           = dsa_slave_setup_tc,
1641         .ndo_get_stats64        = dsa_slave_get_stats64,
1642         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1643         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1644         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1645         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1646         .ndo_change_mtu         = dsa_slave_change_mtu,
1647 };
1648
1649 static struct device_type dsa_type = {
1650         .name   = "dsa",
1651 };
1652
1653 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1654 {
1655         const struct dsa_port *dp = dsa_to_port(ds, port);
1656
1657         if (dp->pl)
1658                 phylink_mac_change(dp->pl, up);
1659 }
1660 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1661
1662 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1663                                           struct phylink_link_state *state)
1664 {
1665         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1666         struct dsa_switch *ds = dp->ds;
1667
1668         /* No need to check that this operation is valid, the callback would
1669          * not be called if it was not.
1670          */
1671         ds->ops->phylink_fixed_state(ds, dp->index, state);
1672 }
1673
1674 /* slave device setup *******************************************************/
1675 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1676 {
1677         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1678         struct dsa_switch *ds = dp->ds;
1679
1680         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1681         if (!slave_dev->phydev) {
1682                 netdev_err(slave_dev, "no phy at %d\n", addr);
1683                 return -ENODEV;
1684         }
1685
1686         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1687 }
1688
1689 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1690 {
1691         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1692         struct device_node *port_dn = dp->dn;
1693         struct dsa_switch *ds = dp->ds;
1694         phy_interface_t mode;
1695         u32 phy_flags = 0;
1696         int ret;
1697
1698         ret = of_get_phy_mode(port_dn, &mode);
1699         if (ret)
1700                 mode = PHY_INTERFACE_MODE_NA;
1701
1702         dp->pl_config.dev = &slave_dev->dev;
1703         dp->pl_config.type = PHYLINK_NETDEV;
1704
1705         /* The get_fixed_state callback takes precedence over polling the
1706          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1707          * this if the switch provides such a callback.
1708          */
1709         if (ds->ops->phylink_fixed_state) {
1710                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1711                 dp->pl_config.poll_fixed_state = true;
1712         }
1713
1714         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1715                                 &dsa_port_phylink_mac_ops);
1716         if (IS_ERR(dp->pl)) {
1717                 netdev_err(slave_dev,
1718                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1719                 return PTR_ERR(dp->pl);
1720         }
1721
1722         if (ds->ops->get_phy_flags)
1723                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1724
1725         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1726         if (ret == -ENODEV && ds->slave_mii_bus) {
1727                 /* We could not connect to a designated PHY or SFP, so try to
1728                  * use the switch internal MDIO bus instead
1729                  */
1730                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1731         }
1732         if (ret) {
1733                 netdev_err(slave_dev, "failed to connect to PHY: %pe\n",
1734                            ERR_PTR(ret));
1735                 phylink_destroy(dp->pl);
1736         }
1737
1738         return ret;
1739 }
1740
1741 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1742 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1743                                             struct netdev_queue *txq,
1744                                             void *_unused)
1745 {
1746         lockdep_set_class(&txq->_xmit_lock,
1747                           &dsa_slave_netdev_xmit_lock_key);
1748 }
1749
1750 int dsa_slave_suspend(struct net_device *slave_dev)
1751 {
1752         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1753
1754         if (!netif_running(slave_dev))
1755                 return 0;
1756
1757         netif_device_detach(slave_dev);
1758
1759         rtnl_lock();
1760         phylink_stop(dp->pl);
1761         rtnl_unlock();
1762
1763         return 0;
1764 }
1765
1766 int dsa_slave_resume(struct net_device *slave_dev)
1767 {
1768         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1769
1770         if (!netif_running(slave_dev))
1771                 return 0;
1772
1773         netif_device_attach(slave_dev);
1774
1775         rtnl_lock();
1776         phylink_start(dp->pl);
1777         rtnl_unlock();
1778
1779         return 0;
1780 }
1781
1782 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1783 {
1784         struct net_device *master = dsa_slave_to_master(dev);
1785         struct dsa_port *dp = dsa_slave_to_port(dev);
1786         struct dsa_notifier_register_info rinfo = {
1787                 .switch_number = dp->ds->index,
1788                 .port_number = dp->index,
1789                 .master = master,
1790                 .info.dev = dev,
1791         };
1792
1793         call_dsa_notifiers(val, dev, &rinfo.info);
1794 }
1795
1796 int dsa_slave_create(struct dsa_port *port)
1797 {
1798         const struct dsa_port *cpu_dp = port->cpu_dp;
1799         struct net_device *master = cpu_dp->master;
1800         struct dsa_switch *ds = port->ds;
1801         const char *name = port->name;
1802         struct net_device *slave_dev;
1803         struct dsa_slave_priv *p;
1804         int ret;
1805
1806         if (!ds->num_tx_queues)
1807                 ds->num_tx_queues = 1;
1808
1809         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1810                                      NET_NAME_UNKNOWN, ether_setup,
1811                                      ds->num_tx_queues, 1);
1812         if (slave_dev == NULL)
1813                 return -ENOMEM;
1814
1815         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1816         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1817                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1818         slave_dev->hw_features |= NETIF_F_HW_TC;
1819         slave_dev->features |= NETIF_F_LLTX;
1820         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1821         if (!IS_ERR_OR_NULL(port->mac))
1822                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1823         else
1824                 eth_hw_addr_inherit(slave_dev, master);
1825         slave_dev->priv_flags |= IFF_NO_QUEUE;
1826         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1827         if (ds->ops->port_max_mtu)
1828                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1829         if (cpu_dp->tag_ops->tail_tag)
1830                 slave_dev->needed_tailroom = cpu_dp->tag_ops->overhead;
1831         else
1832                 slave_dev->needed_headroom = cpu_dp->tag_ops->overhead;
1833         /* Try to save one extra realloc later in the TX path (in the master)
1834          * by also inheriting the master's needed headroom and tailroom.
1835          * The 8021q driver also does this.
1836          */
1837         slave_dev->needed_headroom += master->needed_headroom;
1838         slave_dev->needed_tailroom += master->needed_tailroom;
1839         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1840
1841         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1842                                  NULL);
1843
1844         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1845         slave_dev->dev.of_node = port->dn;
1846         slave_dev->vlan_features = master->vlan_features;
1847
1848         p = netdev_priv(slave_dev);
1849         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1850         if (!p->stats64) {
1851                 free_netdev(slave_dev);
1852                 return -ENOMEM;
1853         }
1854
1855         ret = gro_cells_init(&p->gcells, slave_dev);
1856         if (ret)
1857                 goto out_free;
1858
1859         p->dp = port;
1860         INIT_LIST_HEAD(&p->mall_tc_list);
1861         p->xmit = cpu_dp->tag_ops->xmit;
1862         port->slave = slave_dev;
1863
1864         rtnl_lock();
1865         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1866         rtnl_unlock();
1867         if (ret && ret != -EOPNOTSUPP)
1868                 dev_warn(ds->dev, "nonfatal error %d setting MTU on port %d\n",
1869                          ret, port->index);
1870
1871         netif_carrier_off(slave_dev);
1872
1873         ret = dsa_slave_phy_setup(slave_dev);
1874         if (ret) {
1875                 netdev_err(slave_dev,
1876                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1877                            ret, ds->dst->index, ds->index, port->index);
1878                 goto out_gcells;
1879         }
1880
1881         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1882
1883         rtnl_lock();
1884
1885         ret = register_netdevice(slave_dev);
1886         if (ret) {
1887                 netdev_err(master, "error %d registering interface %s\n",
1888                            ret, slave_dev->name);
1889                 rtnl_unlock();
1890                 goto out_phy;
1891         }
1892
1893         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1894
1895         rtnl_unlock();
1896
1897         if (ret)
1898                 goto out_unregister;
1899
1900         return 0;
1901
1902 out_unregister:
1903         unregister_netdev(slave_dev);
1904 out_phy:
1905         rtnl_lock();
1906         phylink_disconnect_phy(p->dp->pl);
1907         rtnl_unlock();
1908         phylink_destroy(p->dp->pl);
1909 out_gcells:
1910         gro_cells_destroy(&p->gcells);
1911 out_free:
1912         free_percpu(p->stats64);
1913         free_netdev(slave_dev);
1914         port->slave = NULL;
1915         return ret;
1916 }
1917
1918 void dsa_slave_destroy(struct net_device *slave_dev)
1919 {
1920         struct net_device *master = dsa_slave_to_master(slave_dev);
1921         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1922         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1923
1924         netif_carrier_off(slave_dev);
1925         rtnl_lock();
1926         netdev_upper_dev_unlink(master, slave_dev);
1927         unregister_netdevice(slave_dev);
1928         phylink_disconnect_phy(dp->pl);
1929         rtnl_unlock();
1930
1931         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1932         phylink_destroy(dp->pl);
1933         gro_cells_destroy(&p->gcells);
1934         free_percpu(p->stats64);
1935         free_netdev(slave_dev);
1936 }
1937
1938 bool dsa_slave_dev_check(const struct net_device *dev)
1939 {
1940         return dev->netdev_ops == &dsa_slave_netdev_ops;
1941 }
1942
1943 static int dsa_slave_changeupper(struct net_device *dev,
1944                                  struct netdev_notifier_changeupper_info *info)
1945 {
1946         struct dsa_port *dp = dsa_slave_to_port(dev);
1947         int err = NOTIFY_DONE;
1948
1949         if (netif_is_bridge_master(info->upper_dev)) {
1950                 if (info->linking) {
1951                         err = dsa_port_bridge_join(dp, info->upper_dev);
1952                         if (!err)
1953                                 dsa_bridge_mtu_normalization(dp);
1954                         err = notifier_from_errno(err);
1955                 } else {
1956                         dsa_port_bridge_leave(dp, info->upper_dev);
1957                         err = NOTIFY_OK;
1958                 }
1959         }
1960
1961         return err;
1962 }
1963
1964 static int
1965 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
1966                                  struct netdev_notifier_changeupper_info *info)
1967 {
1968         struct netlink_ext_ack *ext_ack;
1969         struct net_device *slave;
1970         struct dsa_port *dp;
1971
1972         ext_ack = netdev_notifier_info_to_extack(&info->info);
1973
1974         if (!is_vlan_dev(dev))
1975                 return NOTIFY_DONE;
1976
1977         slave = vlan_dev_real_dev(dev);
1978         if (!dsa_slave_dev_check(slave))
1979                 return NOTIFY_DONE;
1980
1981         dp = dsa_slave_to_port(slave);
1982         if (!dp->bridge_dev)
1983                 return NOTIFY_DONE;
1984
1985         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1986         if (br_vlan_enabled(dp->bridge_dev) &&
1987             netif_is_bridge_master(info->upper_dev) && info->linking) {
1988                 NL_SET_ERR_MSG_MOD(ext_ack,
1989                                    "Cannot enslave VLAN device into VLAN aware bridge");
1990                 return notifier_from_errno(-EINVAL);
1991         }
1992
1993         return NOTIFY_DONE;
1994 }
1995
1996 static int
1997 dsa_slave_check_8021q_upper(struct net_device *dev,
1998                             struct netdev_notifier_changeupper_info *info)
1999 {
2000         struct dsa_port *dp = dsa_slave_to_port(dev);
2001         struct net_device *br = dp->bridge_dev;
2002         struct bridge_vlan_info br_info;
2003         struct netlink_ext_ack *extack;
2004         int err = NOTIFY_DONE;
2005         u16 vid;
2006
2007         if (!br || !br_vlan_enabled(br))
2008                 return NOTIFY_DONE;
2009
2010         extack = netdev_notifier_info_to_extack(&info->info);
2011         vid = vlan_dev_vlan_id(info->upper_dev);
2012
2013         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2014          * device, respectively the VID is not found, returning
2015          * 0 means success, which is a failure for us here.
2016          */
2017         err = br_vlan_get_info(br, vid, &br_info);
2018         if (err == 0) {
2019                 NL_SET_ERR_MSG_MOD(extack,
2020                                    "This VLAN is already configured by the bridge");
2021                 return notifier_from_errno(-EBUSY);
2022         }
2023
2024         return NOTIFY_DONE;
2025 }
2026
2027 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2028                                      unsigned long event, void *ptr)
2029 {
2030         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2031
2032         switch (event) {
2033         case NETDEV_PRECHANGEUPPER: {
2034                 struct netdev_notifier_changeupper_info *info = ptr;
2035
2036                 if (!dsa_slave_dev_check(dev))
2037                         return dsa_prevent_bridging_8021q_upper(dev, ptr);
2038
2039                 if (is_vlan_dev(info->upper_dev))
2040                         return dsa_slave_check_8021q_upper(dev, ptr);
2041                 break;
2042         }
2043         case NETDEV_CHANGEUPPER:
2044                 if (!dsa_slave_dev_check(dev))
2045                         return NOTIFY_DONE;
2046
2047                 return dsa_slave_changeupper(dev, ptr);
2048         }
2049
2050         return NOTIFY_DONE;
2051 }
2052
2053 struct dsa_switchdev_event_work {
2054         struct work_struct work;
2055         struct switchdev_notifier_fdb_info fdb_info;
2056         struct net_device *dev;
2057         unsigned long event;
2058 };
2059
2060 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2061 {
2062         struct dsa_switchdev_event_work *switchdev_work =
2063                 container_of(work, struct dsa_switchdev_event_work, work);
2064         struct net_device *dev = switchdev_work->dev;
2065         struct switchdev_notifier_fdb_info *fdb_info;
2066         struct dsa_port *dp = dsa_slave_to_port(dev);
2067         int err;
2068
2069         rtnl_lock();
2070         switch (switchdev_work->event) {
2071         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2072                 fdb_info = &switchdev_work->fdb_info;
2073                 if (!fdb_info->added_by_user)
2074                         break;
2075
2076                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
2077                 if (err) {
2078                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
2079                         break;
2080                 }
2081                 fdb_info->offloaded = true;
2082                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
2083                                          &fdb_info->info, NULL);
2084                 break;
2085
2086         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2087                 fdb_info = &switchdev_work->fdb_info;
2088                 if (!fdb_info->added_by_user)
2089                         break;
2090
2091                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
2092                 if (err) {
2093                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
2094                         dev_close(dev);
2095                 }
2096                 break;
2097         }
2098         rtnl_unlock();
2099
2100         kfree(switchdev_work->fdb_info.addr);
2101         kfree(switchdev_work);
2102         dev_put(dev);
2103 }
2104
2105 static int
2106 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
2107                                   switchdev_work,
2108                                   const struct switchdev_notifier_fdb_info *
2109                                   fdb_info)
2110 {
2111         memcpy(&switchdev_work->fdb_info, fdb_info,
2112                sizeof(switchdev_work->fdb_info));
2113         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
2114         if (!switchdev_work->fdb_info.addr)
2115                 return -ENOMEM;
2116         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
2117                         fdb_info->addr);
2118         return 0;
2119 }
2120
2121 /* Called under rcu_read_lock() */
2122 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2123                                      unsigned long event, void *ptr)
2124 {
2125         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2126         struct dsa_switchdev_event_work *switchdev_work;
2127         int err;
2128
2129         if (event == SWITCHDEV_PORT_ATTR_SET) {
2130                 err = switchdev_handle_port_attr_set(dev, ptr,
2131                                                      dsa_slave_dev_check,
2132                                                      dsa_slave_port_attr_set);
2133                 return notifier_from_errno(err);
2134         }
2135
2136         if (!dsa_slave_dev_check(dev))
2137                 return NOTIFY_DONE;
2138
2139         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2140         if (!switchdev_work)
2141                 return NOTIFY_BAD;
2142
2143         INIT_WORK(&switchdev_work->work,
2144                   dsa_slave_switchdev_event_work);
2145         switchdev_work->dev = dev;
2146         switchdev_work->event = event;
2147
2148         switch (event) {
2149         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2150         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2151                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
2152                         goto err_fdb_work_init;
2153                 dev_hold(dev);
2154                 break;
2155         default:
2156                 kfree(switchdev_work);
2157                 return NOTIFY_DONE;
2158         }
2159
2160         dsa_schedule_work(&switchdev_work->work);
2161         return NOTIFY_OK;
2162
2163 err_fdb_work_init:
2164         kfree(switchdev_work);
2165         return NOTIFY_BAD;
2166 }
2167
2168 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2169                                               unsigned long event, void *ptr)
2170 {
2171         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2172         int err;
2173
2174         switch (event) {
2175         case SWITCHDEV_PORT_OBJ_ADD:
2176                 err = switchdev_handle_port_obj_add(dev, ptr,
2177                                                     dsa_slave_dev_check,
2178                                                     dsa_slave_port_obj_add);
2179                 return notifier_from_errno(err);
2180         case SWITCHDEV_PORT_OBJ_DEL:
2181                 err = switchdev_handle_port_obj_del(dev, ptr,
2182                                                     dsa_slave_dev_check,
2183                                                     dsa_slave_port_obj_del);
2184                 return notifier_from_errno(err);
2185         case SWITCHDEV_PORT_ATTR_SET:
2186                 err = switchdev_handle_port_attr_set(dev, ptr,
2187                                                      dsa_slave_dev_check,
2188                                                      dsa_slave_port_attr_set);
2189                 return notifier_from_errno(err);
2190         }
2191
2192         return NOTIFY_DONE;
2193 }
2194
2195 static struct notifier_block dsa_slave_nb __read_mostly = {
2196         .notifier_call  = dsa_slave_netdevice_event,
2197 };
2198
2199 static struct notifier_block dsa_slave_switchdev_notifier = {
2200         .notifier_call = dsa_slave_switchdev_event,
2201 };
2202
2203 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2204         .notifier_call = dsa_slave_switchdev_blocking_event,
2205 };
2206
2207 int dsa_slave_register_notifier(void)
2208 {
2209         struct notifier_block *nb;
2210         int err;
2211
2212         err = register_netdevice_notifier(&dsa_slave_nb);
2213         if (err)
2214                 return err;
2215
2216         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2217         if (err)
2218                 goto err_switchdev_nb;
2219
2220         nb = &dsa_slave_switchdev_blocking_notifier;
2221         err = register_switchdev_blocking_notifier(nb);
2222         if (err)
2223                 goto err_switchdev_blocking_nb;
2224
2225         return 0;
2226
2227 err_switchdev_blocking_nb:
2228         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2229 err_switchdev_nb:
2230         unregister_netdevice_notifier(&dsa_slave_nb);
2231         return err;
2232 }
2233
2234 void dsa_slave_unregister_notifier(void)
2235 {
2236         struct notifier_block *nb;
2237         int err;
2238
2239         nb = &dsa_slave_switchdev_blocking_notifier;
2240         err = unregister_switchdev_blocking_notifier(nb);
2241         if (err)
2242                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2243
2244         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2245         if (err)
2246                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2247
2248         err = unregister_netdevice_notifier(&dsa_slave_nb);
2249         if (err)
2250                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2251 }