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 netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 552 {
 553         struct dsa_slave_priv *p = netdev_priv(dev);
 554         struct pcpu_sw_netstats *s;
 555         struct sk_buff *nskb;
 556
 557         s = this_cpu_ptr(p->stats64);
 558         u64_stats_update_begin(&s->syncp);
 559         s->tx_packets++;
 560         s->tx_bytes += skb->len;
 561         u64_stats_update_end(&s->syncp);
 562
 563         DSA_SKB_CB(skb)->clone = NULL;
 564
 565         /* Identify PTP protocol packets, clone them, and pass them to the
 566          * switch driver
 567          */
 568         dsa_skb_tx_timestamp(p, skb);
 569
 570         /* Transmit function may have to reallocate the original SKB,
 571          * in which case it must have freed it. Only free it here on error.
 572          */
 573         nskb = p->xmit(skb, dev);
 574         if (!nskb) {
 575                 kfree_skb(skb);
 576                 return NETDEV_TX_OK;
 577         }
 578
 579         return dsa_enqueue_skb(nskb, dev);
 580 }
 581
 582 /* ethtool operations *******************************************************/
 583
 584 static void dsa_slave_get_drvinfo(struct net_device *dev,
 585                                   struct ethtool_drvinfo *drvinfo)
 586 {
 587         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 588         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 589         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 590 }
 591
 592 static int dsa_slave_get_regs_len(struct net_device *dev)
 593 {
 594         struct dsa_port *dp = dsa_slave_to_port(dev);
 595         struct dsa_switch *ds = dp->ds;
 596
 597         if (ds->ops->get_regs_len)
 598                 return ds->ops->get_regs_len(ds, dp->index);
 599
 600         return -EOPNOTSUPP;
 601 }
 602
 603 static void
 604 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 605 {
 606         struct dsa_port *dp = dsa_slave_to_port(dev);
 607         struct dsa_switch *ds = dp->ds;
 608
 609         if (ds->ops->get_regs)
 610                 ds->ops->get_regs(ds, dp->index, regs, _p);
 611 }
 612
 613 static int dsa_slave_nway_reset(struct net_device *dev)
 614 {
 615         struct dsa_port *dp = dsa_slave_to_port(dev);
 616
 617         return phylink_ethtool_nway_reset(dp->pl);
 618 }
 619
 620 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 621 {
 622         struct dsa_port *dp = dsa_slave_to_port(dev);
 623         struct dsa_switch *ds = dp->ds;
 624
 625         if (ds->cd && ds->cd->eeprom_len)
 626                 return ds->cd->eeprom_len;
 627
 628         if (ds->ops->get_eeprom_len)
 629                 return ds->ops->get_eeprom_len(ds);
 630
 631         return 0;
 632 }
 633
 634 static int dsa_slave_get_eeprom(struct net_device *dev,
 635                                 struct ethtool_eeprom *eeprom, u8 *data)
 636 {
 637         struct dsa_port *dp = dsa_slave_to_port(dev);
 638         struct dsa_switch *ds = dp->ds;
 639
 640         if (ds->ops->get_eeprom)
 641                 return ds->ops->get_eeprom(ds, eeprom, data);
 642
 643         return -EOPNOTSUPP;
 644 }
 645
 646 static int dsa_slave_set_eeprom(struct net_device *dev,
 647                                 struct ethtool_eeprom *eeprom, u8 *data)
 648 {
 649         struct dsa_port *dp = dsa_slave_to_port(dev);
 650         struct dsa_switch *ds = dp->ds;
 651
 652         if (ds->ops->set_eeprom)
 653                 return ds->ops->set_eeprom(ds, eeprom, data);
 654
 655         return -EOPNOTSUPP;
 656 }
 657
 658 static void dsa_slave_get_strings(struct net_device *dev,
 659                                   uint32_t stringset, uint8_t *data)
 660 {
 661         struct dsa_port *dp = dsa_slave_to_port(dev);
 662         struct dsa_switch *ds = dp->ds;
 663
 664         if (stringset == ETH_SS_STATS) {
 665                 int len = ETH_GSTRING_LEN;
 666
 667                 strncpy(data, "tx_packets", len);
 668                 strncpy(data + len, "tx_bytes", len);
 669                 strncpy(data + 2 * len, "rx_packets", len);
 670                 strncpy(data + 3 * len, "rx_bytes", len);
 671                 if (ds->ops->get_strings)
 672                         ds->ops->get_strings(ds, dp->index, stringset,
 673                                              data + 4 * len);
 674         }
 675 }
 676
 677 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 678                                         struct ethtool_stats *stats,
 679                                         uint64_t *data)
 680 {
 681         struct dsa_port *dp = dsa_slave_to_port(dev);
 682         struct dsa_slave_priv *p = netdev_priv(dev);
 683         struct dsa_switch *ds = dp->ds;
 684         struct pcpu_sw_netstats *s;
 685         unsigned int start;
 686         int i;
 687
 688         for_each_possible_cpu(i) {
 689                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 690
 691                 s = per_cpu_ptr(p->stats64, i);
 692                 do {
 693                         start = u64_stats_fetch_begin_irq(&s->syncp);
 694                         tx_packets = s->tx_packets;
 695                         tx_bytes = s->tx_bytes;
 696                         rx_packets = s->rx_packets;
 697                         rx_bytes = s->rx_bytes;
 698                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 699                 data[0] += tx_packets;
 700                 data[1] += tx_bytes;
 701                 data[2] += rx_packets;
 702                 data[3] += rx_bytes;
 703         }
 704         if (ds->ops->get_ethtool_stats)
 705                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 706 }
 707
 708 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 709 {
 710         struct dsa_port *dp = dsa_slave_to_port(dev);
 711         struct dsa_switch *ds = dp->ds;
 712
 713         if (sset == ETH_SS_STATS) {
 714                 int count;
 715
 716                 count = 4;
 717                 if (ds->ops->get_sset_count)
 718                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 719
 720                 return count;
 721         }
 722
 723         return -EOPNOTSUPP;
 724 }
 725
 726 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 727 {
 728         struct dsa_port *dp = dsa_slave_to_port(dev);
 729         struct dsa_switch *ds = dp->ds;
 730
 731         phylink_ethtool_get_wol(dp->pl, w);
 732
 733         if (ds->ops->get_wol)
 734                 ds->ops->get_wol(ds, dp->index, w);
 735 }
 736
 737 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 738 {
 739         struct dsa_port *dp = dsa_slave_to_port(dev);
 740         struct dsa_switch *ds = dp->ds;
 741         int ret = -EOPNOTSUPP;
 742
 743         phylink_ethtool_set_wol(dp->pl, w);
 744
 745         if (ds->ops->set_wol)
 746                 ret = ds->ops->set_wol(ds, dp->index, w);
 747
 748         return ret;
 749 }
 750
 751 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 752 {
 753         struct dsa_port *dp = dsa_slave_to_port(dev);
 754         struct dsa_switch *ds = dp->ds;
 755         int ret;
 756
 757         /* Port's PHY and MAC both need to be EEE capable */
 758         if (!dev->phydev || !dp->pl)
 759                 return -ENODEV;
 760
 761         if (!ds->ops->set_mac_eee)
 762                 return -EOPNOTSUPP;
 763
 764         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 765         if (ret)
 766                 return ret;
 767
 768         return phylink_ethtool_set_eee(dp->pl, e);
 769 }
 770
 771 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 772 {
 773         struct dsa_port *dp = dsa_slave_to_port(dev);
 774         struct dsa_switch *ds = dp->ds;
 775         int ret;
 776
 777         /* Port's PHY and MAC both need to be EEE capable */
 778         if (!dev->phydev || !dp->pl)
 779                 return -ENODEV;
 780
 781         if (!ds->ops->get_mac_eee)
 782                 return -EOPNOTSUPP;
 783
 784         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 785         if (ret)
 786                 return ret;
 787
 788         return phylink_ethtool_get_eee(dp->pl, e);
 789 }
 790
 791 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 792                                         struct ethtool_link_ksettings *cmd)
 793 {
 794         struct dsa_port *dp = dsa_slave_to_port(dev);
 795
 796         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 797 }
 798
 799 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 800                                         const struct ethtool_link_ksettings *cmd)
 801 {
 802         struct dsa_port *dp = dsa_slave_to_port(dev);
 803
 804         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 805 }
 806
 807 static void dsa_slave_get_pauseparam(struct net_device *dev,
 808                                      struct ethtool_pauseparam *pause)
 809 {
 810         struct dsa_port *dp = dsa_slave_to_port(dev);
 811
 812         phylink_ethtool_get_pauseparam(dp->pl, pause);
 813 }
 814
 815 static int dsa_slave_set_pauseparam(struct net_device *dev,
 816                                     struct ethtool_pauseparam *pause)
 817 {
 818         struct dsa_port *dp = dsa_slave_to_port(dev);
 819
 820         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 821 }
 822
 823 #ifdef CONFIG_NET_POLL_CONTROLLER
 824 static int dsa_slave_netpoll_setup(struct net_device *dev,
 825                                    struct netpoll_info *ni)
 826 {
 827         struct net_device *master = dsa_slave_to_master(dev);
 828         struct dsa_slave_priv *p = netdev_priv(dev);
 829         struct netpoll *netpoll;
 830         int err = 0;
 831
 832         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 833         if (!netpoll)
 834                 return -ENOMEM;
 835
 836         err = __netpoll_setup(netpoll, master);
 837         if (err) {
 838                 kfree(netpoll);
 839                 goto out;
 840         }
 841
 842         p->netpoll = netpoll;
 843 out:
 844         return err;
 845 }
 846
 847 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 848 {
 849         struct dsa_slave_priv *p = netdev_priv(dev);
 850         struct netpoll *netpoll = p->netpoll;
 851
 852         if (!netpoll)
 853                 return;
 854
 855         p->netpoll = NULL;
 856
 857         __netpoll_free(netpoll);
 858 }
 859
 860 static void dsa_slave_poll_controller(struct net_device *dev)
 861 {
 862 }
 863 #endif
 864
 865 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 866                                         char *name, size_t len)
 867 {
 868         struct dsa_port *dp = dsa_slave_to_port(dev);
 869
 870         /* For non-legacy ports, devlink is used and it takes
 871          * care of the name generation. This ndo implementation
 872          * should be removed with legacy support.
 873          */
 874         if (dp->ds->devlink)
 875                 return -EOPNOTSUPP;
 876
 877         if (snprintf(name, len, "p%d", dp->index) >= len)
 878                 return -EINVAL;
 879
 880         return 0;
 881 }
 882
 883 static struct dsa_mall_tc_entry *
 884 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 885 {
 886         struct dsa_slave_priv *p = netdev_priv(dev);
 887         struct dsa_mall_tc_entry *mall_tc_entry;
 888
 889         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 890                 if (mall_tc_entry->cookie == cookie)
 891                         return mall_tc_entry;
 892
 893         return NULL;
 894 }
 895
 896 static int
 897 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 898                                   struct tc_cls_matchall_offload *cls,
 899                                   bool ingress)
 900 {
 901         struct dsa_port *dp = dsa_slave_to_port(dev);
 902         struct dsa_slave_priv *p = netdev_priv(dev);
 903         struct dsa_mall_mirror_tc_entry *mirror;
 904         struct dsa_mall_tc_entry *mall_tc_entry;
 905         struct dsa_switch *ds = dp->ds;
 906         struct flow_action_entry *act;
 907         struct dsa_port *to_dp;
 908         int err;
 909
 910         if (!ds->ops->port_mirror_add)
 911                 return -EOPNOTSUPP;
 912
 913         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 914                                               cls->common.extack))
 915                 return -EOPNOTSUPP;
 916
 917         act = &cls->rule->action.entries[0];
 918
 919         if (!act->dev)
 920                 return -EINVAL;
 921
 922         if (!dsa_slave_dev_check(act->dev))
 923                 return -EOPNOTSUPP;
 924
 925         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 926         if (!mall_tc_entry)
 927                 return -ENOMEM;
 928
 929         mall_tc_entry->cookie = cls->cookie;
 930         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 931         mirror = &mall_tc_entry->mirror;
 932
 933         to_dp = dsa_slave_to_port(act->dev);
 934
 935         mirror->to_local_port = to_dp->index;
 936         mirror->ingress = ingress;
 937
 938         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 939         if (err) {
 940                 kfree(mall_tc_entry);
 941                 return err;
 942         }
 943
 944         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 945
 946         return err;
 947 }
 948
 949 static int
 950 dsa_slave_add_cls_matchall_police(struct net_device *dev,
 951                                   struct tc_cls_matchall_offload *cls,
 952                                   bool ingress)
 953 {
 954         struct netlink_ext_ack *extack = cls->common.extack;
 955         struct dsa_port *dp = dsa_slave_to_port(dev);
 956         struct dsa_slave_priv *p = netdev_priv(dev);
 957         struct dsa_mall_policer_tc_entry *policer;
 958         struct dsa_mall_tc_entry *mall_tc_entry;
 959         struct dsa_switch *ds = dp->ds;
 960         struct flow_action_entry *act;
 961         int err;
 962
 963         if (!ds->ops->port_policer_add) {
 964                 NL_SET_ERR_MSG_MOD(extack,
 965                                    "Policing offload not implemented");
 966                 return -EOPNOTSUPP;
 967         }
 968
 969         if (!ingress) {
 970                 NL_SET_ERR_MSG_MOD(extack,
 971                                    "Only supported on ingress qdisc");
 972                 return -EOPNOTSUPP;
 973         }
 974
 975         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 976                                               cls->common.extack))
 977                 return -EOPNOTSUPP;
 978
 979         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
 980                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
 981                         NL_SET_ERR_MSG_MOD(extack,
 982                                            "Only one port policer allowed");
 983                         return -EEXIST;
 984                 }
 985         }
 986
 987         act = &cls->rule->action.entries[0];
 988
 989         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 990         if (!mall_tc_entry)
 991                 return -ENOMEM;
 992
 993         mall_tc_entry->cookie = cls->cookie;
 994         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
 995         policer = &mall_tc_entry->policer;
 996         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
 997         policer->burst = act->police.burst;
 998
 999         err = ds->ops->port_policer_add(ds, dp->index, policer);
1000         if (err) {
1001                 kfree(mall_tc_entry);
1002                 return err;
1003         }
1004
1005         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1006
1007         return err;
1008 }
1009
1010 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1011                                       struct tc_cls_matchall_offload *cls,
1012                                       bool ingress)
1013 {
1014         int err = -EOPNOTSUPP;
1015
1016         if (cls->common.protocol == htons(ETH_P_ALL) &&
1017             flow_offload_has_one_action(&cls->rule->action) &&
1018             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1019                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1020         else if (flow_offload_has_one_action(&cls->rule->action) &&
1021                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1022                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1023
1024         return err;
1025 }
1026
1027 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1028                                        struct tc_cls_matchall_offload *cls)
1029 {
1030         struct dsa_port *dp = dsa_slave_to_port(dev);
1031         struct dsa_mall_tc_entry *mall_tc_entry;
1032         struct dsa_switch *ds = dp->ds;
1033
1034         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1035         if (!mall_tc_entry)
1036                 return;
1037
1038         list_del(&mall_tc_entry->list);
1039
1040         switch (mall_tc_entry->type) {
1041         case DSA_PORT_MALL_MIRROR:
1042                 if (ds->ops->port_mirror_del)
1043                         ds->ops->port_mirror_del(ds, dp->index,
1044                                                  &mall_tc_entry->mirror);
1045                 break;
1046         case DSA_PORT_MALL_POLICER:
1047                 if (ds->ops->port_policer_del)
1048                         ds->ops->port_policer_del(ds, dp->index);
1049                 break;
1050         default:
1051                 WARN_ON(1);
1052         }
1053
1054         kfree(mall_tc_entry);
1055 }
1056
1057 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1058                                            struct tc_cls_matchall_offload *cls,
1059                                            bool ingress)
1060 {
1061         if (cls->common.chain_index)
1062                 return -EOPNOTSUPP;
1063
1064         switch (cls->command) {
1065         case TC_CLSMATCHALL_REPLACE:
1066                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1067         case TC_CLSMATCHALL_DESTROY:
1068                 dsa_slave_del_cls_matchall(dev, cls);
1069                 return 0;
1070         default:
1071                 return -EOPNOTSUPP;
1072         }
1073 }
1074
1075 static int dsa_slave_add_cls_flower(struct net_device *dev,
1076                                     struct flow_cls_offload *cls,
1077                                     bool ingress)
1078 {
1079         struct dsa_port *dp = dsa_slave_to_port(dev);
1080         struct dsa_switch *ds = dp->ds;
1081         int port = dp->index;
1082
1083         if (!ds->ops->cls_flower_add)
1084                 return -EOPNOTSUPP;
1085
1086         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1087 }
1088
1089 static int dsa_slave_del_cls_flower(struct net_device *dev,
1090                                     struct flow_cls_offload *cls,
1091                                     bool ingress)
1092 {
1093         struct dsa_port *dp = dsa_slave_to_port(dev);
1094         struct dsa_switch *ds = dp->ds;
1095         int port = dp->index;
1096
1097         if (!ds->ops->cls_flower_del)
1098                 return -EOPNOTSUPP;
1099
1100         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1101 }
1102
1103 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1104                                       struct flow_cls_offload *cls,
1105                                       bool ingress)
1106 {
1107         struct dsa_port *dp = dsa_slave_to_port(dev);
1108         struct dsa_switch *ds = dp->ds;
1109         int port = dp->index;
1110
1111         if (!ds->ops->cls_flower_stats)
1112                 return -EOPNOTSUPP;
1113
1114         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1115 }
1116
1117 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1118                                          struct flow_cls_offload *cls,
1119                                          bool ingress)
1120 {
1121         switch (cls->command) {
1122         case FLOW_CLS_REPLACE:
1123                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1124         case FLOW_CLS_DESTROY:
1125                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1126         case FLOW_CLS_STATS:
1127                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1128         default:
1129                 return -EOPNOTSUPP;
1130         }
1131 }
1132
1133 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1134                                        void *cb_priv, bool ingress)
1135 {
1136         struct net_device *dev = cb_priv;
1137
1138         if (!tc_can_offload(dev))
1139                 return -EOPNOTSUPP;
1140
1141         switch (type) {
1142         case TC_SETUP_CLSMATCHALL:
1143                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1144         case TC_SETUP_CLSFLOWER:
1145                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1146         default:
1147                 return -EOPNOTSUPP;
1148         }
1149 }
1150
1151 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1152                                           void *type_data, void *cb_priv)
1153 {
1154         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1155 }
1156
1157 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1158                                           void *type_data, void *cb_priv)
1159 {
1160         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1161 }
1162
1163 static LIST_HEAD(dsa_slave_block_cb_list);
1164
1165 static int dsa_slave_setup_tc_block(struct net_device *dev,
1166                                     struct flow_block_offload *f)
1167 {
1168         struct flow_block_cb *block_cb;
1169         flow_setup_cb_t *cb;
1170
1171         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1172                 cb = dsa_slave_setup_tc_block_cb_ig;
1173         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1174                 cb = dsa_slave_setup_tc_block_cb_eg;
1175         else
1176                 return -EOPNOTSUPP;
1177
1178         f->driver_block_list = &dsa_slave_block_cb_list;
1179
1180         switch (f->command) {
1181         case FLOW_BLOCK_BIND:
1182                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1183                         return -EBUSY;
1184
1185                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1186                 if (IS_ERR(block_cb))
1187                         return PTR_ERR(block_cb);
1188
1189                 flow_block_cb_add(block_cb, f);
1190                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1191                 return 0;
1192         case FLOW_BLOCK_UNBIND:
1193                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1194                 if (!block_cb)
1195                         return -ENOENT;
1196
1197                 flow_block_cb_remove(block_cb, f);
1198                 list_del(&block_cb->driver_list);
1199                 return 0;
1200         default:
1201                 return -EOPNOTSUPP;
1202         }
1203 }
1204
1205 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1206                               void *type_data)
1207 {
1208         struct dsa_port *dp = dsa_slave_to_port(dev);
1209         struct dsa_switch *ds = dp->ds;
1210
1211         if (type == TC_SETUP_BLOCK)
1212                 return dsa_slave_setup_tc_block(dev, type_data);
1213
1214         if (!ds->ops->port_setup_tc)
1215                 return -EOPNOTSUPP;
1216
1217         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1218 }
1219
1220 static void dsa_slave_get_stats64(struct net_device *dev,
1221                                   struct rtnl_link_stats64 *stats)
1222 {
1223         struct dsa_slave_priv *p = netdev_priv(dev);
1224         struct pcpu_sw_netstats *s;
1225         unsigned int start;
1226         int i;
1227
1228         netdev_stats_to_stats64(stats, &dev->stats);
1229         for_each_possible_cpu(i) {
1230                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
1231
1232                 s = per_cpu_ptr(p->stats64, i);
1233                 do {
1234                         start = u64_stats_fetch_begin_irq(&s->syncp);
1235                         tx_packets = s->tx_packets;
1236                         tx_bytes = s->tx_bytes;
1237                         rx_packets = s->rx_packets;
1238                         rx_bytes = s->rx_bytes;
1239                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
1240
1241                 stats->tx_packets += tx_packets;
1242                 stats->tx_bytes += tx_bytes;
1243                 stats->rx_packets += rx_packets;
1244                 stats->rx_bytes += rx_bytes;
1245         }
1246 }
1247
1248 static int dsa_slave_get_rxnfc(struct net_device *dev,
1249                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1250 {
1251         struct dsa_port *dp = dsa_slave_to_port(dev);
1252         struct dsa_switch *ds = dp->ds;
1253
1254         if (!ds->ops->get_rxnfc)
1255                 return -EOPNOTSUPP;
1256
1257         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1258 }
1259
1260 static int dsa_slave_set_rxnfc(struct net_device *dev,
1261                                struct ethtool_rxnfc *nfc)
1262 {
1263         struct dsa_port *dp = dsa_slave_to_port(dev);
1264         struct dsa_switch *ds = dp->ds;
1265
1266         if (!ds->ops->set_rxnfc)
1267                 return -EOPNOTSUPP;
1268
1269         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1270 }
1271
1272 static int dsa_slave_get_ts_info(struct net_device *dev,
1273                                  struct ethtool_ts_info *ts)
1274 {
1275         struct dsa_slave_priv *p = netdev_priv(dev);
1276         struct dsa_switch *ds = p->dp->ds;
1277
1278         if (!ds->ops->get_ts_info)
1279                 return -EOPNOTSUPP;
1280
1281         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1282 }
1283
1284 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1285                                      u16 vid)
1286 {
1287         struct net_device *master = dsa_slave_to_master(dev);
1288         struct dsa_port *dp = dsa_slave_to_port(dev);
1289         struct switchdev_obj_port_vlan vlan = {
1290                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1291                 .vid_begin = vid,
1292                 .vid_end = vid,
1293                 /* This API only allows programming tagged, non-PVID VIDs */
1294                 .flags = 0,
1295         };
1296         struct switchdev_trans trans;
1297         int ret;
1298
1299         /* User port... */
1300         trans.ph_prepare = true;
1301         ret = dsa_port_vlan_add(dp, &vlan, &trans);
1302         if (ret)
1303                 return ret;
1304
1305         trans.ph_prepare = false;
1306         ret = dsa_port_vlan_add(dp, &vlan, &trans);
1307         if (ret)
1308                 return ret;
1309
1310         /* And CPU port... */
1311         trans.ph_prepare = true;
1312         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &trans);
1313         if (ret)
1314                 return ret;
1315
1316         trans.ph_prepare = false;
1317         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &trans);
1318         if (ret)
1319                 return ret;
1320
1321         return vlan_vid_add(master, proto, vid);
1322 }
1323
1324 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1325                                       u16 vid)
1326 {
1327         struct net_device *master = dsa_slave_to_master(dev);
1328         struct dsa_port *dp = dsa_slave_to_port(dev);
1329         struct switchdev_obj_port_vlan vlan = {
1330                 .vid_begin = vid,
1331                 .vid_end = vid,
1332                 /* This API only allows programming tagged, non-PVID VIDs */
1333                 .flags = 0,
1334         };
1335         int err;
1336
1337         /* Do not deprogram the CPU port as it may be shared with other user
1338          * ports which can be members of this VLAN as well.
1339          */
1340         err = dsa_port_vlan_del(dp, &vlan);
1341         if (err)
1342                 return err;
1343
1344         vlan_vid_del(master, proto, vid);
1345
1346         return 0;
1347 }
1348
1349 struct dsa_hw_port {
1350         struct list_head list;
1351         struct net_device *dev;
1352         int old_mtu;
1353 };
1354
1355 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1356 {
1357         const struct dsa_hw_port *p;
1358         int err;
1359
1360         list_for_each_entry(p, hw_port_list, list) {
1361                 if (p->dev->mtu == mtu)
1362                         continue;
1363
1364                 err = dev_set_mtu(p->dev, mtu);
1365                 if (err)
1366                         goto rollback;
1367         }
1368
1369         return 0;
1370
1371 rollback:
1372         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1373                 if (p->dev->mtu == p->old_mtu)
1374                         continue;
1375
1376                 if (dev_set_mtu(p->dev, p->old_mtu))
1377                         netdev_err(p->dev, "Failed to restore MTU\n");
1378         }
1379
1380         return err;
1381 }
1382
1383 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1384 {
1385         struct dsa_hw_port *p, *n;
1386
1387         list_for_each_entry_safe(p, n, hw_port_list, list)
1388                 kfree(p);
1389 }
1390
1391 /* Make the hardware datapath to/from @dev limited to a common MTU */
1392 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1393 {
1394         struct list_head hw_port_list;
1395         struct dsa_switch_tree *dst;
1396         int min_mtu = ETH_MAX_MTU;
1397         struct dsa_port *other_dp;
1398         int err;
1399
1400         if (!dp->ds->mtu_enforcement_ingress)
1401                 return;
1402
1403         if (!dp->bridge_dev)
1404                 return;
1405
1406         INIT_LIST_HEAD(&hw_port_list);
1407
1408         /* Populate the list of ports that are part of the same bridge
1409          * as the newly added/modified port
1410          */
1411         list_for_each_entry(dst, &dsa_tree_list, list) {
1412                 list_for_each_entry(other_dp, &dst->ports, list) {
1413                         struct dsa_hw_port *hw_port;
1414                         struct net_device *slave;
1415
1416                         if (other_dp->type != DSA_PORT_TYPE_USER)
1417                                 continue;
1418
1419                         if (other_dp->bridge_dev != dp->bridge_dev)
1420                                 continue;
1421
1422                         if (!other_dp->ds->mtu_enforcement_ingress)
1423                                 continue;
1424
1425                         slave = other_dp->slave;
1426
1427                         if (min_mtu > slave->mtu)
1428                                 min_mtu = slave->mtu;
1429
1430                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1431                         if (!hw_port)
1432                                 goto out;
1433
1434                         hw_port->dev = slave;
1435                         hw_port->old_mtu = slave->mtu;
1436
1437                         list_add(&hw_port->list, &hw_port_list);
1438                 }
1439         }
1440
1441         /* Attempt to configure the entire hardware bridge to the newly added
1442          * interface's MTU first, regardless of whether the intention of the
1443          * user was to raise or lower it.
1444          */
1445         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1446         if (!err)
1447                 goto out;
1448
1449         /* Clearly that didn't work out so well, so just set the minimum MTU on
1450          * all hardware bridge ports now. If this fails too, then all ports will
1451          * still have their old MTU rolled back anyway.
1452          */
1453         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1454
1455 out:
1456         dsa_hw_port_list_free(&hw_port_list);
1457 }
1458
1459 static int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1460 {
1461         struct net_device *master = dsa_slave_to_master(dev);
1462         struct dsa_port *dp = dsa_slave_to_port(dev);
1463         struct dsa_slave_priv *p = netdev_priv(dev);
1464         struct dsa_switch *ds = p->dp->ds;
1465         struct dsa_port *cpu_dp;
1466         int port = p->dp->index;
1467         int largest_mtu = 0;
1468         int new_master_mtu;
1469         int old_master_mtu;
1470         int mtu_limit;
1471         int cpu_mtu;
1472         int err, i;
1473
1474         if (!ds->ops->port_change_mtu)
1475                 return -EOPNOTSUPP;
1476
1477         for (i = 0; i < ds->num_ports; i++) {
1478                 int slave_mtu;
1479
1480                 if (!dsa_is_user_port(ds, i))
1481                         continue;
1482
1483                 /* During probe, this function will be called for each slave
1484                  * device, while not all of them have been allocated. That's
1485                  * ok, it doesn't change what the maximum is, so ignore it.
1486                  */
1487                 if (!dsa_to_port(ds, i)->slave)
1488                         continue;
1489
1490                 /* Pretend that we already applied the setting, which we
1491                  * actually haven't (still haven't done all integrity checks)
1492                  */
1493                 if (i == port)
1494                         slave_mtu = new_mtu;
1495                 else
1496                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1497
1498                 if (largest_mtu < slave_mtu)
1499                         largest_mtu = slave_mtu;
1500         }
1501
1502         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1503
1504         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1505         old_master_mtu = master->mtu;
1506         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1507         if (new_master_mtu > mtu_limit)
1508                 return -ERANGE;
1509
1510         /* If the master MTU isn't over limit, there's no need to check the CPU
1511          * MTU, since that surely isn't either.
1512          */
1513         cpu_mtu = largest_mtu;
1514
1515         /* Start applying stuff */
1516         if (new_master_mtu != old_master_mtu) {
1517                 err = dev_set_mtu(master, new_master_mtu);
1518                 if (err < 0)
1519                         goto out_master_failed;
1520
1521                 /* We only need to propagate the MTU of the CPU port to
1522                  * upstream switches.
1523                  */
1524                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1525                 if (err)
1526                         goto out_cpu_failed;
1527         }
1528
1529         err = dsa_port_mtu_change(dp, new_mtu, false);
1530         if (err)
1531                 goto out_port_failed;
1532
1533         dev->mtu = new_mtu;
1534
1535         dsa_bridge_mtu_normalization(dp);
1536
1537         return 0;
1538
1539 out_port_failed:
1540         if (new_master_mtu != old_master_mtu)
1541                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1542                                     cpu_dp->tag_ops->overhead,
1543                                     true);
1544 out_cpu_failed:
1545         if (new_master_mtu != old_master_mtu)
1546                 dev_set_mtu(master, old_master_mtu);
1547 out_master_failed:
1548         return err;
1549 }
1550
1551 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1552         .get_drvinfo            = dsa_slave_get_drvinfo,
1553         .get_regs_len           = dsa_slave_get_regs_len,
1554         .get_regs               = dsa_slave_get_regs,
1555         .nway_reset             = dsa_slave_nway_reset,
1556         .get_link               = ethtool_op_get_link,
1557         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1558         .get_eeprom             = dsa_slave_get_eeprom,
1559         .set_eeprom             = dsa_slave_set_eeprom,
1560         .get_strings            = dsa_slave_get_strings,
1561         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1562         .get_sset_count         = dsa_slave_get_sset_count,
1563         .set_wol                = dsa_slave_set_wol,
1564         .get_wol                = dsa_slave_get_wol,
1565         .set_eee                = dsa_slave_set_eee,
1566         .get_eee                = dsa_slave_get_eee,
1567         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1568         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1569         .get_pauseparam         = dsa_slave_get_pauseparam,
1570         .set_pauseparam         = dsa_slave_set_pauseparam,
1571         .get_rxnfc              = dsa_slave_get_rxnfc,
1572         .set_rxnfc              = dsa_slave_set_rxnfc,
1573         .get_ts_info            = dsa_slave_get_ts_info,
1574 };
1575
1576 /* legacy way, bypassing the bridge *****************************************/
1577 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1578                        struct net_device *dev,
1579                        const unsigned char *addr, u16 vid,
1580                        u16 flags,
1581                        struct netlink_ext_ack *extack)
1582 {
1583         struct dsa_port *dp = dsa_slave_to_port(dev);
1584
1585         return dsa_port_fdb_add(dp, addr, vid);
1586 }
1587
1588 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1589                        struct net_device *dev,
1590                        const unsigned char *addr, u16 vid)
1591 {
1592         struct dsa_port *dp = dsa_slave_to_port(dev);
1593
1594         return dsa_port_fdb_del(dp, addr, vid);
1595 }
1596
1597 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1598 {
1599         struct dsa_port *dp = dsa_slave_to_port(dev);
1600
1601         return dp->ds->devlink ? &dp->devlink_port : NULL;
1602 }
1603
1604 static const struct net_device_ops dsa_slave_netdev_ops = {
1605         .ndo_open               = dsa_slave_open,
1606         .ndo_stop               = dsa_slave_close,
1607         .ndo_start_xmit         = dsa_slave_xmit,
1608         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1609         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1610         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1611         .ndo_fdb_add            = dsa_legacy_fdb_add,
1612         .ndo_fdb_del            = dsa_legacy_fdb_del,
1613         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1614         .ndo_do_ioctl           = dsa_slave_ioctl,
1615         .ndo_get_iflink         = dsa_slave_get_iflink,
1616 #ifdef CONFIG_NET_POLL_CONTROLLER
1617         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1618         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1619         .ndo_poll_controller    = dsa_slave_poll_controller,
1620 #endif
1621         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1622         .ndo_setup_tc           = dsa_slave_setup_tc,
1623         .ndo_get_stats64        = dsa_slave_get_stats64,
1624         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1625         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1626         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1627         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1628         .ndo_change_mtu         = dsa_slave_change_mtu,
1629 };
1630
1631 static struct device_type dsa_type = {
1632         .name   = "dsa",
1633 };
1634
1635 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1636 {
1637         const struct dsa_port *dp = dsa_to_port(ds, port);
1638
1639         if (dp->pl)
1640                 phylink_mac_change(dp->pl, up);
1641 }
1642 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1643
1644 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1645                                           struct phylink_link_state *state)
1646 {
1647         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1648         struct dsa_switch *ds = dp->ds;
1649
1650         /* No need to check that this operation is valid, the callback would
1651          * not be called if it was not.
1652          */
1653         ds->ops->phylink_fixed_state(ds, dp->index, state);
1654 }
1655
1656 /* slave device setup *******************************************************/
1657 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1658 {
1659         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1660         struct dsa_switch *ds = dp->ds;
1661
1662         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1663         if (!slave_dev->phydev) {
1664                 netdev_err(slave_dev, "no phy at %d\n", addr);
1665                 return -ENODEV;
1666         }
1667
1668         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1669 }
1670
1671 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1672 {
1673         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1674         struct device_node *port_dn = dp->dn;
1675         struct dsa_switch *ds = dp->ds;
1676         phy_interface_t mode;
1677         u32 phy_flags = 0;
1678         int ret;
1679
1680         ret = of_get_phy_mode(port_dn, &mode);
1681         if (ret)
1682                 mode = PHY_INTERFACE_MODE_NA;
1683
1684         dp->pl_config.dev = &slave_dev->dev;
1685         dp->pl_config.type = PHYLINK_NETDEV;
1686
1687         /* The get_fixed_state callback takes precedence over polling the
1688          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1689          * this if the switch provides such a callback.
1690          */
1691         if (ds->ops->phylink_fixed_state) {
1692                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1693                 dp->pl_config.poll_fixed_state = true;
1694         }
1695
1696         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1697                                 &dsa_port_phylink_mac_ops);
1698         if (IS_ERR(dp->pl)) {
1699                 netdev_err(slave_dev,
1700                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1701                 return PTR_ERR(dp->pl);
1702         }
1703
1704         if (ds->ops->get_phy_flags)
1705                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1706
1707         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1708         if (ret == -ENODEV && ds->slave_mii_bus) {
1709                 /* We could not connect to a designated PHY or SFP, so try to
1710                  * use the switch internal MDIO bus instead
1711                  */
1712                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1713                 if (ret) {
1714                         netdev_err(slave_dev,
1715                                    "failed to connect to port %d: %d\n",
1716                                    dp->index, ret);
1717                         phylink_destroy(dp->pl);
1718                         return ret;
1719                 }
1720         }
1721
1722         return ret;
1723 }
1724
1725 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1726 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1727                                             struct netdev_queue *txq,
1728                                             void *_unused)
1729 {
1730         lockdep_set_class(&txq->_xmit_lock,
1731                           &dsa_slave_netdev_xmit_lock_key);
1732 }
1733
1734 int dsa_slave_suspend(struct net_device *slave_dev)
1735 {
1736         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1737
1738         if (!netif_running(slave_dev))
1739                 return 0;
1740
1741         netif_device_detach(slave_dev);
1742
1743         rtnl_lock();
1744         phylink_stop(dp->pl);
1745         rtnl_unlock();
1746
1747         return 0;
1748 }
1749
1750 int dsa_slave_resume(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_attach(slave_dev);
1758
1759         rtnl_lock();
1760         phylink_start(dp->pl);
1761         rtnl_unlock();
1762
1763         return 0;
1764 }
1765
1766 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1767 {
1768         struct net_device *master = dsa_slave_to_master(dev);
1769         struct dsa_port *dp = dsa_slave_to_port(dev);
1770         struct dsa_notifier_register_info rinfo = {
1771                 .switch_number = dp->ds->index,
1772                 .port_number = dp->index,
1773                 .master = master,
1774                 .info.dev = dev,
1775         };
1776
1777         call_dsa_notifiers(val, dev, &rinfo.info);
1778 }
1779
1780 int dsa_slave_create(struct dsa_port *port)
1781 {
1782         const struct dsa_port *cpu_dp = port->cpu_dp;
1783         struct net_device *master = cpu_dp->master;
1784         struct dsa_switch *ds = port->ds;
1785         const char *name = port->name;
1786         struct net_device *slave_dev;
1787         struct dsa_slave_priv *p;
1788         int ret;
1789
1790         if (!ds->num_tx_queues)
1791                 ds->num_tx_queues = 1;
1792
1793         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1794                                      NET_NAME_UNKNOWN, ether_setup,
1795                                      ds->num_tx_queues, 1);
1796         if (slave_dev == NULL)
1797                 return -ENOMEM;
1798
1799         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1800         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1801                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1802         slave_dev->hw_features |= NETIF_F_HW_TC;
1803         slave_dev->features |= NETIF_F_LLTX;
1804         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1805         if (!IS_ERR_OR_NULL(port->mac))
1806                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1807         else
1808                 eth_hw_addr_inherit(slave_dev, master);
1809         slave_dev->priv_flags |= IFF_NO_QUEUE;
1810         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1811         if (ds->ops->port_max_mtu)
1812                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1813         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1814
1815         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1816                                  NULL);
1817
1818         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1819         slave_dev->dev.of_node = port->dn;
1820         slave_dev->vlan_features = master->vlan_features;
1821
1822         p = netdev_priv(slave_dev);
1823         p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1824         if (!p->stats64) {
1825                 free_netdev(slave_dev);
1826                 return -ENOMEM;
1827         }
1828
1829         ret = gro_cells_init(&p->gcells, slave_dev);
1830         if (ret)
1831                 goto out_free;
1832
1833         p->dp = port;
1834         INIT_LIST_HEAD(&p->mall_tc_list);
1835         p->xmit = cpu_dp->tag_ops->xmit;
1836         port->slave = slave_dev;
1837
1838         rtnl_lock();
1839         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1840         rtnl_unlock();
1841         if (ret && ret != -EOPNOTSUPP)
1842                 dev_warn(ds->dev, "nonfatal error %d setting MTU on port %d\n",
1843                          ret, port->index);
1844
1845         netif_carrier_off(slave_dev);
1846
1847         ret = dsa_slave_phy_setup(slave_dev);
1848         if (ret) {
1849                 netdev_err(slave_dev,
1850                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1851                            ret, ds->dst->index, ds->index, port->index);
1852                 goto out_gcells;
1853         }
1854
1855         dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1856
1857         rtnl_lock();
1858
1859         ret = register_netdevice(slave_dev);
1860         if (ret) {
1861                 netdev_err(master, "error %d registering interface %s\n",
1862                            ret, slave_dev->name);
1863                 rtnl_unlock();
1864                 goto out_phy;
1865         }
1866
1867         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1868
1869         rtnl_unlock();
1870
1871         if (ret)
1872                 goto out_unregister;
1873
1874         return 0;
1875
1876 out_unregister:
1877         unregister_netdev(slave_dev);
1878 out_phy:
1879         rtnl_lock();
1880         phylink_disconnect_phy(p->dp->pl);
1881         rtnl_unlock();
1882         phylink_destroy(p->dp->pl);
1883 out_gcells:
1884         gro_cells_destroy(&p->gcells);
1885 out_free:
1886         free_percpu(p->stats64);
1887         free_netdev(slave_dev);
1888         port->slave = NULL;
1889         return ret;
1890 }
1891
1892 void dsa_slave_destroy(struct net_device *slave_dev)
1893 {
1894         struct net_device *master = dsa_slave_to_master(slave_dev);
1895         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1896         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1897
1898         netif_carrier_off(slave_dev);
1899         rtnl_lock();
1900         netdev_upper_dev_unlink(master, slave_dev);
1901         unregister_netdevice(slave_dev);
1902         phylink_disconnect_phy(dp->pl);
1903         rtnl_unlock();
1904
1905         dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1906         phylink_destroy(dp->pl);
1907         gro_cells_destroy(&p->gcells);
1908         free_percpu(p->stats64);
1909         free_netdev(slave_dev);
1910 }
1911
1912 bool dsa_slave_dev_check(const struct net_device *dev)
1913 {
1914         return dev->netdev_ops == &dsa_slave_netdev_ops;
1915 }
1916
1917 static int dsa_slave_changeupper(struct net_device *dev,
1918                                  struct netdev_notifier_changeupper_info *info)
1919 {
1920         struct dsa_port *dp = dsa_slave_to_port(dev);
1921         int err = NOTIFY_DONE;
1922
1923         if (netif_is_bridge_master(info->upper_dev)) {
1924                 if (info->linking) {
1925                         err = dsa_port_bridge_join(dp, info->upper_dev);
1926                         if (!err)
1927                                 dsa_bridge_mtu_normalization(dp);
1928                         err = notifier_from_errno(err);
1929                 } else {
1930                         dsa_port_bridge_leave(dp, info->upper_dev);
1931                         err = NOTIFY_OK;
1932                 }
1933         }
1934
1935         return err;
1936 }
1937
1938 static int
1939 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
1940                                  struct netdev_notifier_changeupper_info *info)
1941 {
1942         struct netlink_ext_ack *ext_ack;
1943         struct net_device *slave;
1944         struct dsa_port *dp;
1945
1946         ext_ack = netdev_notifier_info_to_extack(&info->info);
1947
1948         if (!is_vlan_dev(dev))
1949                 return NOTIFY_DONE;
1950
1951         slave = vlan_dev_real_dev(dev);
1952         if (!dsa_slave_dev_check(slave))
1953                 return NOTIFY_DONE;
1954
1955         dp = dsa_slave_to_port(slave);
1956         if (!dp->bridge_dev)
1957                 return NOTIFY_DONE;
1958
1959         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1960         if (br_vlan_enabled(dp->bridge_dev) &&
1961             netif_is_bridge_master(info->upper_dev) && info->linking) {
1962                 NL_SET_ERR_MSG_MOD(ext_ack,
1963                                    "Cannot enslave VLAN device into VLAN aware bridge");
1964                 return notifier_from_errno(-EINVAL);
1965         }
1966
1967         return NOTIFY_DONE;
1968 }
1969
1970 static int
1971 dsa_slave_check_8021q_upper(struct net_device *dev,
1972                             struct netdev_notifier_changeupper_info *info)
1973 {
1974         struct dsa_port *dp = dsa_slave_to_port(dev);
1975         struct net_device *br = dp->bridge_dev;
1976         struct bridge_vlan_info br_info;
1977         struct netlink_ext_ack *extack;
1978         int err = NOTIFY_DONE;
1979         u16 vid;
1980
1981         if (!br || !br_vlan_enabled(br))
1982                 return NOTIFY_DONE;
1983
1984         extack = netdev_notifier_info_to_extack(&info->info);
1985         vid = vlan_dev_vlan_id(info->upper_dev);
1986
1987         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1988          * device, respectively the VID is not found, returning
1989          * 0 means success, which is a failure for us here.
1990          */
1991         err = br_vlan_get_info(br, vid, &br_info);
1992         if (err == 0) {
1993                 NL_SET_ERR_MSG_MOD(extack,
1994                                    "This VLAN is already configured by the bridge");
1995                 return notifier_from_errno(-EBUSY);
1996         }
1997
1998         return NOTIFY_DONE;
1999 }
2000
2001 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2002                                      unsigned long event, void *ptr)
2003 {
2004         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2005
2006         switch (event) {
2007         case NETDEV_PRECHANGEUPPER: {
2008                 struct netdev_notifier_changeupper_info *info = ptr;
2009
2010                 if (!dsa_slave_dev_check(dev))
2011                         return dsa_prevent_bridging_8021q_upper(dev, ptr);
2012
2013                 if (is_vlan_dev(info->upper_dev))
2014                         return dsa_slave_check_8021q_upper(dev, ptr);
2015                 break;
2016         }
2017         case NETDEV_CHANGEUPPER:
2018                 if (!dsa_slave_dev_check(dev))
2019                         return NOTIFY_DONE;
2020
2021                 return dsa_slave_changeupper(dev, ptr);
2022         }
2023
2024         return NOTIFY_DONE;
2025 }
2026
2027 struct dsa_switchdev_event_work {
2028         struct work_struct work;
2029         struct switchdev_notifier_fdb_info fdb_info;
2030         struct net_device *dev;
2031         unsigned long event;
2032 };
2033
2034 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2035 {
2036         struct dsa_switchdev_event_work *switchdev_work =
2037                 container_of(work, struct dsa_switchdev_event_work, work);
2038         struct net_device *dev = switchdev_work->dev;
2039         struct switchdev_notifier_fdb_info *fdb_info;
2040         struct dsa_port *dp = dsa_slave_to_port(dev);
2041         int err;
2042
2043         rtnl_lock();
2044         switch (switchdev_work->event) {
2045         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2046                 fdb_info = &switchdev_work->fdb_info;
2047                 if (!fdb_info->added_by_user)
2048                         break;
2049
2050                 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
2051                 if (err) {
2052                         netdev_dbg(dev, "fdb add failed err=%d\n", err);
2053                         break;
2054                 }
2055                 fdb_info->offloaded = true;
2056                 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
2057                                          &fdb_info->info, NULL);
2058                 break;
2059
2060         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2061                 fdb_info = &switchdev_work->fdb_info;
2062                 if (!fdb_info->added_by_user)
2063                         break;
2064
2065                 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
2066                 if (err) {
2067                         netdev_dbg(dev, "fdb del failed err=%d\n", err);
2068                         dev_close(dev);
2069                 }
2070                 break;
2071         }
2072         rtnl_unlock();
2073
2074         kfree(switchdev_work->fdb_info.addr);
2075         kfree(switchdev_work);
2076         dev_put(dev);
2077 }
2078
2079 static int
2080 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
2081                                   switchdev_work,
2082                                   const struct switchdev_notifier_fdb_info *
2083                                   fdb_info)
2084 {
2085         memcpy(&switchdev_work->fdb_info, fdb_info,
2086                sizeof(switchdev_work->fdb_info));
2087         switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
2088         if (!switchdev_work->fdb_info.addr)
2089                 return -ENOMEM;
2090         ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
2091                         fdb_info->addr);
2092         return 0;
2093 }
2094
2095 /* Called under rcu_read_lock() */
2096 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2097                                      unsigned long event, void *ptr)
2098 {
2099         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2100         struct dsa_switchdev_event_work *switchdev_work;
2101         int err;
2102
2103         if (event == SWITCHDEV_PORT_ATTR_SET) {
2104                 err = switchdev_handle_port_attr_set(dev, ptr,
2105                                                      dsa_slave_dev_check,
2106                                                      dsa_slave_port_attr_set);
2107                 return notifier_from_errno(err);
2108         }
2109
2110         if (!dsa_slave_dev_check(dev))
2111                 return NOTIFY_DONE;
2112
2113         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2114         if (!switchdev_work)
2115                 return NOTIFY_BAD;
2116
2117         INIT_WORK(&switchdev_work->work,
2118                   dsa_slave_switchdev_event_work);
2119         switchdev_work->dev = dev;
2120         switchdev_work->event = event;
2121
2122         switch (event) {
2123         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2124         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2125                 if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
2126                         goto err_fdb_work_init;
2127                 dev_hold(dev);
2128                 break;
2129         default:
2130                 kfree(switchdev_work);
2131                 return NOTIFY_DONE;
2132         }
2133
2134         dsa_schedule_work(&switchdev_work->work);
2135         return NOTIFY_OK;
2136
2137 err_fdb_work_init:
2138         kfree(switchdev_work);
2139         return NOTIFY_BAD;
2140 }
2141
2142 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2143                                               unsigned long event, void *ptr)
2144 {
2145         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2146         int err;
2147
2148         switch (event) {
2149         case SWITCHDEV_PORT_OBJ_ADD:
2150                 err = switchdev_handle_port_obj_add(dev, ptr,
2151                                                     dsa_slave_dev_check,
2152                                                     dsa_slave_port_obj_add);
2153                 return notifier_from_errno(err);
2154         case SWITCHDEV_PORT_OBJ_DEL:
2155                 err = switchdev_handle_port_obj_del(dev, ptr,
2156                                                     dsa_slave_dev_check,
2157                                                     dsa_slave_port_obj_del);
2158                 return notifier_from_errno(err);
2159         case SWITCHDEV_PORT_ATTR_SET:
2160                 err = switchdev_handle_port_attr_set(dev, ptr,
2161                                                      dsa_slave_dev_check,
2162                                                      dsa_slave_port_attr_set);
2163                 return notifier_from_errno(err);
2164         }
2165
2166         return NOTIFY_DONE;
2167 }
2168
2169 static struct notifier_block dsa_slave_nb __read_mostly = {
2170         .notifier_call  = dsa_slave_netdevice_event,
2171 };
2172
2173 static struct notifier_block dsa_slave_switchdev_notifier = {
2174         .notifier_call = dsa_slave_switchdev_event,
2175 };
2176
2177 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2178         .notifier_call = dsa_slave_switchdev_blocking_event,
2179 };
2180
2181 int dsa_slave_register_notifier(void)
2182 {
2183         struct notifier_block *nb;
2184         int err;
2185
2186         err = register_netdevice_notifier(&dsa_slave_nb);
2187         if (err)
2188                 return err;
2189
2190         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2191         if (err)
2192                 goto err_switchdev_nb;
2193
2194         nb = &dsa_slave_switchdev_blocking_notifier;
2195         err = register_switchdev_blocking_notifier(nb);
2196         if (err)
2197                 goto err_switchdev_blocking_nb;
2198
2199         return 0;
2200
2201 err_switchdev_blocking_nb:
2202         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2203 err_switchdev_nb:
2204         unregister_netdevice_notifier(&dsa_slave_nb);
2205         return err;
2206 }
2207
2208 void dsa_slave_unregister_notifier(void)
2209 {
2210         struct notifier_block *nb;
2211         int err;
2212
2213         nb = &dsa_slave_switchdev_blocking_notifier;
2214         err = unregister_switchdev_blocking_notifier(nb);
2215         if (err)
2216                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2217
2218         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2219         if (err)
2220                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2221
2222         err = unregister_netdevice_notifier(&dsa_slave_nb);
2223         if (err)
2224                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2225 }