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/selftests.h>
  19 #include <net/tc_act/tc_mirred.h>
  20 #include <linux/if_bridge.h>
  21 #include <linux/if_hsr.h>
  22 #include <net/dcbnl.h>
  23 #include <linux/netpoll.h>
  24
  25 #include "dsa_priv.h"
  26
  27 static void dsa_slave_standalone_event_work(struct work_struct *work)
  28 {
  29         struct dsa_standalone_event_work *standalone_work =
  30                 container_of(work, struct dsa_standalone_event_work, work);
  31         const unsigned char *addr = standalone_work->addr;
  32         struct net_device *dev = standalone_work->dev;
  33         struct dsa_port *dp = dsa_slave_to_port(dev);
  34         struct switchdev_obj_port_mdb mdb;
  35         struct dsa_switch *ds = dp->ds;
  36         u16 vid = standalone_work->vid;
  37         int err;
  38
  39         switch (standalone_work->event) {
  40         case DSA_UC_ADD:
  41                 err = dsa_port_standalone_host_fdb_add(dp, addr, vid);
  42                 if (err) {
  43                         dev_err(ds->dev,
  44                                 "port %d failed to add %pM vid %d to fdb: %d\n",
  45                                 dp->index, addr, vid, err);
  46                         break;
  47                 }
  48                 break;
  49
  50         case DSA_UC_DEL:
  51                 err = dsa_port_standalone_host_fdb_del(dp, addr, vid);
  52                 if (err) {
  53                         dev_err(ds->dev,
  54                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
  55                                 dp->index, addr, vid, err);
  56                 }
  57
  58                 break;
  59         case DSA_MC_ADD:
  60                 ether_addr_copy(mdb.addr, addr);
  61                 mdb.vid = vid;
  62
  63                 err = dsa_port_standalone_host_mdb_add(dp, &mdb);
  64                 if (err) {
  65                         dev_err(ds->dev,
  66                                 "port %d failed to add %pM vid %d to mdb: %d\n",
  67                                 dp->index, addr, vid, err);
  68                         break;
  69                 }
  70                 break;
  71         case DSA_MC_DEL:
  72                 ether_addr_copy(mdb.addr, addr);
  73                 mdb.vid = vid;
  74
  75                 err = dsa_port_standalone_host_mdb_del(dp, &mdb);
  76                 if (err) {
  77                         dev_err(ds->dev,
  78                                 "port %d failed to delete %pM vid %d from mdb: %d\n",
  79                                 dp->index, addr, vid, err);
  80                 }
  81
  82                 break;
  83         }
  84
  85         kfree(standalone_work);
  86 }
  87
  88 static int dsa_slave_schedule_standalone_work(struct net_device *dev,
  89                                               enum dsa_standalone_event event,
  90                                               const unsigned char *addr,
  91                                               u16 vid)
  92 {
  93         struct dsa_standalone_event_work *standalone_work;
  94
  95         standalone_work = kzalloc(sizeof(*standalone_work), GFP_ATOMIC);
  96         if (!standalone_work)
  97                 return -ENOMEM;
  98
  99         INIT_WORK(&standalone_work->work, dsa_slave_standalone_event_work);
 100         standalone_work->event = event;
 101         standalone_work->dev = dev;
 102
 103         ether_addr_copy(standalone_work->addr, addr);
 104         standalone_work->vid = vid;
 105
 106         dsa_schedule_work(&standalone_work->work);
 107
 108         return 0;
 109 }
 110
 111 static int dsa_slave_sync_uc(struct net_device *dev,
 112                              const unsigned char *addr)
 113 {
 114         struct net_device *master = dsa_slave_to_master(dev);
 115         struct dsa_port *dp = dsa_slave_to_port(dev);
 116
 117         dev_uc_add(master, addr);
 118
 119         if (!dsa_switch_supports_uc_filtering(dp->ds))
 120                 return 0;
 121
 122         return dsa_slave_schedule_standalone_work(dev, DSA_UC_ADD, addr, 0);
 123 }
 124
 125 static int dsa_slave_unsync_uc(struct net_device *dev,
 126                                const unsigned char *addr)
 127 {
 128         struct net_device *master = dsa_slave_to_master(dev);
 129         struct dsa_port *dp = dsa_slave_to_port(dev);
 130
 131         dev_uc_del(master, addr);
 132
 133         if (!dsa_switch_supports_uc_filtering(dp->ds))
 134                 return 0;
 135
 136         return dsa_slave_schedule_standalone_work(dev, DSA_UC_DEL, addr, 0);
 137 }
 138
 139 static int dsa_slave_sync_mc(struct net_device *dev,
 140                              const unsigned char *addr)
 141 {
 142         struct net_device *master = dsa_slave_to_master(dev);
 143         struct dsa_port *dp = dsa_slave_to_port(dev);
 144
 145         dev_mc_add(master, addr);
 146
 147         if (!dsa_switch_supports_mc_filtering(dp->ds))
 148                 return 0;
 149
 150         return dsa_slave_schedule_standalone_work(dev, DSA_MC_ADD, addr, 0);
 151 }
 152
 153 static int dsa_slave_unsync_mc(struct net_device *dev,
 154                                const unsigned char *addr)
 155 {
 156         struct net_device *master = dsa_slave_to_master(dev);
 157         struct dsa_port *dp = dsa_slave_to_port(dev);
 158
 159         dev_mc_del(master, addr);
 160
 161         if (!dsa_switch_supports_mc_filtering(dp->ds))
 162                 return 0;
 163
 164         return dsa_slave_schedule_standalone_work(dev, DSA_MC_DEL, addr, 0);
 165 }
 166
 167 void dsa_slave_sync_ha(struct net_device *dev)
 168 {
 169         struct dsa_port *dp = dsa_slave_to_port(dev);
 170         struct dsa_switch *ds = dp->ds;
 171         struct netdev_hw_addr *ha;
 172
 173         netif_addr_lock_bh(dev);
 174
 175         netdev_for_each_synced_mc_addr(ha, dev)
 176                 dsa_slave_sync_mc(dev, ha->addr);
 177
 178         netdev_for_each_synced_uc_addr(ha, dev)
 179                 dsa_slave_sync_uc(dev, ha->addr);
 180
 181         netif_addr_unlock_bh(dev);
 182
 183         if (dsa_switch_supports_uc_filtering(ds) ||
 184             dsa_switch_supports_mc_filtering(ds))
 185                 dsa_flush_workqueue();
 186 }
 187
 188 void dsa_slave_unsync_ha(struct net_device *dev)
 189 {
 190         struct dsa_port *dp = dsa_slave_to_port(dev);
 191         struct dsa_switch *ds = dp->ds;
 192         struct netdev_hw_addr *ha;
 193
 194         netif_addr_lock_bh(dev);
 195
 196         netdev_for_each_synced_uc_addr(ha, dev)
 197                 dsa_slave_unsync_uc(dev, ha->addr);
 198
 199         netdev_for_each_synced_mc_addr(ha, dev)
 200                 dsa_slave_unsync_mc(dev, ha->addr);
 201
 202         netif_addr_unlock_bh(dev);
 203
 204         if (dsa_switch_supports_uc_filtering(ds) ||
 205             dsa_switch_supports_mc_filtering(ds))
 206                 dsa_flush_workqueue();
 207 }
 208
 209 /* slave mii_bus handling ***************************************************/
 210 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
 211 {
 212         struct dsa_switch *ds = bus->priv;
 213
 214         if (ds->phys_mii_mask & (1 << addr))
 215                 return ds->ops->phy_read(ds, addr, reg);
 216
 217         return 0xffff;
 218 }
 219
 220 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
 221 {
 222         struct dsa_switch *ds = bus->priv;
 223
 224         if (ds->phys_mii_mask & (1 << addr))
 225                 return ds->ops->phy_write(ds, addr, reg, val);
 226
 227         return 0;
 228 }
 229
 230 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
 231 {
 232         ds->slave_mii_bus->priv = (void *)ds;
 233         ds->slave_mii_bus->name = "dsa slave smi";
 234         ds->slave_mii_bus->read = dsa_slave_phy_read;
 235         ds->slave_mii_bus->write = dsa_slave_phy_write;
 236         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
 237                  ds->dst->index, ds->index);
 238         ds->slave_mii_bus->parent = ds->dev;
 239         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
 240 }
 241
 242
 243 /* slave device handling ****************************************************/
 244 static int dsa_slave_get_iflink(const struct net_device *dev)
 245 {
 246         return dsa_slave_to_master(dev)->ifindex;
 247 }
 248
 249 static int dsa_slave_open(struct net_device *dev)
 250 {
 251         struct net_device *master = dsa_slave_to_master(dev);
 252         struct dsa_port *dp = dsa_slave_to_port(dev);
 253         struct dsa_switch *ds = dp->ds;
 254         int err;
 255
 256         err = dev_open(master, NULL);
 257         if (err < 0) {
 258                 netdev_err(dev, "failed to open master %s\n", master->name);
 259                 goto out;
 260         }
 261
 262         if (dsa_switch_supports_uc_filtering(ds)) {
 263                 err = dsa_port_standalone_host_fdb_add(dp, dev->dev_addr, 0);
 264                 if (err)
 265                         goto out;
 266         }
 267
 268         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
 269                 err = dev_uc_add(master, dev->dev_addr);
 270                 if (err < 0)
 271                         goto del_host_addr;
 272         }
 273
 274         err = dsa_port_enable_rt(dp, dev->phydev);
 275         if (err)
 276                 goto del_unicast;
 277
 278         return 0;
 279
 280 del_unicast:
 281         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 282                 dev_uc_del(master, dev->dev_addr);
 283 del_host_addr:
 284         if (dsa_switch_supports_uc_filtering(ds))
 285                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 286 out:
 287         return err;
 288 }
 289
 290 static int dsa_slave_close(struct net_device *dev)
 291 {
 292         struct net_device *master = dsa_slave_to_master(dev);
 293         struct dsa_port *dp = dsa_slave_to_port(dev);
 294         struct dsa_switch *ds = dp->ds;
 295
 296         dsa_port_disable_rt(dp);
 297
 298         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 299                 dev_uc_del(master, dev->dev_addr);
 300
 301         if (dsa_switch_supports_uc_filtering(ds))
 302                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 303
 304         return 0;
 305 }
 306
 307 static void dsa_slave_manage_host_flood(struct net_device *dev)
 308 {
 309         bool mc = dev->flags & (IFF_PROMISC | IFF_ALLMULTI);
 310         struct dsa_port *dp = dsa_slave_to_port(dev);
 311         bool uc = dev->flags & IFF_PROMISC;
 312
 313         dsa_port_set_host_flood(dp, uc, mc);
 314 }
 315
 316 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 317 {
 318         struct net_device *master = dsa_slave_to_master(dev);
 319         struct dsa_port *dp = dsa_slave_to_port(dev);
 320         struct dsa_switch *ds = dp->ds;
 321
 322         if (change & IFF_ALLMULTI)
 323                 dev_set_allmulti(master,
 324                                  dev->flags & IFF_ALLMULTI ? 1 : -1);
 325         if (change & IFF_PROMISC)
 326                 dev_set_promiscuity(master,
 327                                     dev->flags & IFF_PROMISC ? 1 : -1);
 328
 329         if (dsa_switch_supports_uc_filtering(ds) &&
 330             dsa_switch_supports_mc_filtering(ds))
 331                 dsa_slave_manage_host_flood(dev);
 332 }
 333
 334 static void dsa_slave_set_rx_mode(struct net_device *dev)
 335 {
 336         __dev_mc_sync(dev, dsa_slave_sync_mc, dsa_slave_unsync_mc);
 337         __dev_uc_sync(dev, dsa_slave_sync_uc, dsa_slave_unsync_uc);
 338 }
 339
 340 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 341 {
 342         struct net_device *master = dsa_slave_to_master(dev);
 343         struct dsa_port *dp = dsa_slave_to_port(dev);
 344         struct dsa_switch *ds = dp->ds;
 345         struct sockaddr *addr = a;
 346         int err;
 347
 348         if (!is_valid_ether_addr(addr->sa_data))
 349                 return -EADDRNOTAVAIL;
 350
 351         /* If the port is down, the address isn't synced yet to hardware or
 352          * to the DSA master, so there is nothing to change.
 353          */
 354         if (!(dev->flags & IFF_UP))
 355                 goto out_change_dev_addr;
 356
 357         if (dsa_switch_supports_uc_filtering(ds)) {
 358                 err = dsa_port_standalone_host_fdb_add(dp, addr->sa_data, 0);
 359                 if (err)
 360                         return err;
 361         }
 362
 363         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 364                 err = dev_uc_add(master, addr->sa_data);
 365                 if (err < 0)
 366                         goto del_unicast;
 367         }
 368
 369         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 370                 dev_uc_del(master, dev->dev_addr);
 371
 372         if (dsa_switch_supports_uc_filtering(ds))
 373                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 374
 375 out_change_dev_addr:
 376         eth_hw_addr_set(dev, addr->sa_data);
 377
 378         return 0;
 379
 380 del_unicast:
 381         if (dsa_switch_supports_uc_filtering(ds))
 382                 dsa_port_standalone_host_fdb_del(dp, addr->sa_data, 0);
 383
 384         return err;
 385 }
 386
 387 struct dsa_slave_dump_ctx {
 388         struct net_device *dev;
 389         struct sk_buff *skb;
 390         struct netlink_callback *cb;
 391         int idx;
 392 };
 393
 394 static int
 395 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 396                            bool is_static, void *data)
 397 {
 398         struct dsa_slave_dump_ctx *dump = data;
 399         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 400         u32 seq = dump->cb->nlh->nlmsg_seq;
 401         struct nlmsghdr *nlh;
 402         struct ndmsg *ndm;
 403
 404         if (dump->idx < dump->cb->args[2])
 405                 goto skip;
 406
 407         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 408                         sizeof(*ndm), NLM_F_MULTI);
 409         if (!nlh)
 410                 return -EMSGSIZE;
 411
 412         ndm = nlmsg_data(nlh);
 413         ndm->ndm_family  = AF_BRIDGE;
 414         ndm->ndm_pad1    = 0;
 415         ndm->ndm_pad2    = 0;
 416         ndm->ndm_flags   = NTF_SELF;
 417         ndm->ndm_type    = 0;
 418         ndm->ndm_ifindex = dump->dev->ifindex;
 419         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 420
 421         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 422                 goto nla_put_failure;
 423
 424         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 425                 goto nla_put_failure;
 426
 427         nlmsg_end(dump->skb, nlh);
 428
 429 skip:
 430         dump->idx++;
 431         return 0;
 432
 433 nla_put_failure:
 434         nlmsg_cancel(dump->skb, nlh);
 435         return -EMSGSIZE;
 436 }
 437
 438 static int
 439 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 440                    struct net_device *dev, struct net_device *filter_dev,
 441                    int *idx)
 442 {
 443         struct dsa_port *dp = dsa_slave_to_port(dev);
 444         struct dsa_slave_dump_ctx dump = {
 445                 .dev = dev,
 446                 .skb = skb,
 447                 .cb = cb,
 448                 .idx = *idx,
 449         };
 450         int err;
 451
 452         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 453         *idx = dump.idx;
 454
 455         return err;
 456 }
 457
 458 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 459 {
 460         struct dsa_slave_priv *p = netdev_priv(dev);
 461         struct dsa_switch *ds = p->dp->ds;
 462         int port = p->dp->index;
 463
 464         /* Pass through to switch driver if it supports timestamping */
 465         switch (cmd) {
 466         case SIOCGHWTSTAMP:
 467                 if (ds->ops->port_hwtstamp_get)
 468                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 469                 break;
 470         case SIOCSHWTSTAMP:
 471                 if (ds->ops->port_hwtstamp_set)
 472                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 473                 break;
 474         }
 475
 476         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 477 }
 478
 479 static int dsa_slave_port_attr_set(struct net_device *dev, const void *ctx,
 480                                    const struct switchdev_attr *attr,
 481                                    struct netlink_ext_ack *extack)
 482 {
 483         struct dsa_port *dp = dsa_slave_to_port(dev);
 484         int ret;
 485
 486         if (ctx && ctx != dp)
 487                 return 0;
 488
 489         switch (attr->id) {
 490         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 491                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 492                         return -EOPNOTSUPP;
 493
 494                 ret = dsa_port_set_state(dp, attr->u.stp_state, true);
 495                 break;
 496         case SWITCHDEV_ATTR_ID_PORT_MST_STATE:
 497                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 498                         return -EOPNOTSUPP;
 499
 500                 ret = dsa_port_set_mst_state(dp, &attr->u.mst_state, extack);
 501                 break;
 502         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 503                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 504                         return -EOPNOTSUPP;
 505
 506                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 507                                               extack);
 508                 break;
 509         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 510                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 511                         return -EOPNOTSUPP;
 512
 513                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 514                 break;
 515         case SWITCHDEV_ATTR_ID_BRIDGE_MST:
 516                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 517                         return -EOPNOTSUPP;
 518
 519                 ret = dsa_port_mst_enable(dp, attr->u.mst, extack);
 520                 break;
 521         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 522                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 523                         return -EOPNOTSUPP;
 524
 525                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 526                                                 extack);
 527                 break;
 528         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 529                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 530                         return -EOPNOTSUPP;
 531
 532                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 533                 break;
 534         case SWITCHDEV_ATTR_ID_VLAN_MSTI:
 535                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 536                         return -EOPNOTSUPP;
 537
 538                 ret = dsa_port_vlan_msti(dp, &attr->u.vlan_msti);
 539                 break;
 540         default:
 541                 ret = -EOPNOTSUPP;
 542                 break;
 543         }
 544
 545         return ret;
 546 }
 547
 548 /* Must be called under rcu_read_lock() */
 549 static int
 550 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 551                                       const struct switchdev_obj_port_vlan *vlan)
 552 {
 553         struct net_device *upper_dev;
 554         struct list_head *iter;
 555
 556         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 557                 u16 vid;
 558
 559                 if (!is_vlan_dev(upper_dev))
 560                         continue;
 561
 562                 vid = vlan_dev_vlan_id(upper_dev);
 563                 if (vid == vlan->vid)
 564                         return -EBUSY;
 565         }
 566
 567         return 0;
 568 }
 569
 570 static int dsa_slave_vlan_add(struct net_device *dev,
 571                               const struct switchdev_obj *obj,
 572                               struct netlink_ext_ack *extack)
 573 {
 574         struct dsa_port *dp = dsa_slave_to_port(dev);
 575         struct switchdev_obj_port_vlan *vlan;
 576         int err;
 577
 578         if (dsa_port_skip_vlan_configuration(dp)) {
 579                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 580                 return 0;
 581         }
 582
 583         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 584
 585         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 586          * the same VID.
 587          */
 588         if (br_vlan_enabled(dsa_port_bridge_dev_get(dp))) {
 589                 rcu_read_lock();
 590                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, vlan);
 591                 rcu_read_unlock();
 592                 if (err) {
 593                         NL_SET_ERR_MSG_MOD(extack,
 594                                            "Port already has a VLAN upper with this VID");
 595                         return err;
 596                 }
 597         }
 598
 599         return dsa_port_vlan_add(dp, vlan, extack);
 600 }
 601
 602 /* Offload a VLAN installed on the bridge or on a foreign interface by
 603  * installing it as a VLAN towards the CPU port.
 604  */
 605 static int dsa_slave_host_vlan_add(struct net_device *dev,
 606                                    const struct switchdev_obj *obj,
 607                                    struct netlink_ext_ack *extack)
 608 {
 609         struct dsa_port *dp = dsa_slave_to_port(dev);
 610         struct switchdev_obj_port_vlan vlan;
 611
 612         /* Do nothing if this is a software bridge */
 613         if (!dp->bridge)
 614                 return -EOPNOTSUPP;
 615
 616         if (dsa_port_skip_vlan_configuration(dp)) {
 617                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 618                 return 0;
 619         }
 620
 621         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 622
 623         /* Even though drivers often handle CPU membership in special ways,
 624          * it doesn't make sense to program a PVID, so clear this flag.
 625          */
 626         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 627
 628         return dsa_port_host_vlan_add(dp, &vlan, extack);
 629 }
 630
 631 static int dsa_slave_port_obj_add(struct net_device *dev, const void *ctx,
 632                                   const struct switchdev_obj *obj,
 633                                   struct netlink_ext_ack *extack)
 634 {
 635         struct dsa_port *dp = dsa_slave_to_port(dev);
 636         int err;
 637
 638         if (ctx && ctx != dp)
 639                 return 0;
 640
 641         switch (obj->id) {
 642         case SWITCHDEV_OBJ_ID_PORT_MDB:
 643                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 644                         return -EOPNOTSUPP;
 645
 646                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 647                 break;
 648         case SWITCHDEV_OBJ_ID_HOST_MDB:
 649                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 650                         return -EOPNOTSUPP;
 651
 652                 err = dsa_port_bridge_host_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 653                 break;
 654         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 655                 if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 656                         err = dsa_slave_vlan_add(dev, obj, extack);
 657                 else
 658                         err = dsa_slave_host_vlan_add(dev, obj, extack);
 659                 break;
 660         case SWITCHDEV_OBJ_ID_MRP:
 661                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 662                         return -EOPNOTSUPP;
 663
 664                 err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 665                 break;
 666         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 667                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 668                         return -EOPNOTSUPP;
 669
 670                 err = dsa_port_mrp_add_ring_role(dp,
 671                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 672                 break;
 673         default:
 674                 err = -EOPNOTSUPP;
 675                 break;
 676         }
 677
 678         return err;
 679 }
 680
 681 static int dsa_slave_vlan_del(struct net_device *dev,
 682                               const struct switchdev_obj *obj)
 683 {
 684         struct dsa_port *dp = dsa_slave_to_port(dev);
 685         struct switchdev_obj_port_vlan *vlan;
 686
 687         if (dsa_port_skip_vlan_configuration(dp))
 688                 return 0;
 689
 690         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 691
 692         return dsa_port_vlan_del(dp, vlan);
 693 }
 694
 695 static int dsa_slave_host_vlan_del(struct net_device *dev,
 696                                    const struct switchdev_obj *obj)
 697 {
 698         struct dsa_port *dp = dsa_slave_to_port(dev);
 699         struct switchdev_obj_port_vlan *vlan;
 700
 701         /* Do nothing if this is a software bridge */
 702         if (!dp->bridge)
 703                 return -EOPNOTSUPP;
 704
 705         if (dsa_port_skip_vlan_configuration(dp))
 706                 return 0;
 707
 708         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 709
 710         return dsa_port_host_vlan_del(dp, vlan);
 711 }
 712
 713 static int dsa_slave_port_obj_del(struct net_device *dev, const void *ctx,
 714                                   const struct switchdev_obj *obj)
 715 {
 716         struct dsa_port *dp = dsa_slave_to_port(dev);
 717         int err;
 718
 719         if (ctx && ctx != dp)
 720                 return 0;
 721
 722         switch (obj->id) {
 723         case SWITCHDEV_OBJ_ID_PORT_MDB:
 724                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 725                         return -EOPNOTSUPP;
 726
 727                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 728                 break;
 729         case SWITCHDEV_OBJ_ID_HOST_MDB:
 730                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 731                         return -EOPNOTSUPP;
 732
 733                 err = dsa_port_bridge_host_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 734                 break;
 735         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 736                 if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 737                         err = dsa_slave_vlan_del(dev, obj);
 738                 else
 739                         err = dsa_slave_host_vlan_del(dev, obj);
 740                 break;
 741         case SWITCHDEV_OBJ_ID_MRP:
 742                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 743                         return -EOPNOTSUPP;
 744
 745                 err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 746                 break;
 747         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 748                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 749                         return -EOPNOTSUPP;
 750
 751                 err = dsa_port_mrp_del_ring_role(dp,
 752                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 753                 break;
 754         default:
 755                 err = -EOPNOTSUPP;
 756                 break;
 757         }
 758
 759         return err;
 760 }
 761
 762 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 763                                                      struct sk_buff *skb)
 764 {
 765 #ifdef CONFIG_NET_POLL_CONTROLLER
 766         struct dsa_slave_priv *p = netdev_priv(dev);
 767
 768         return netpoll_send_skb(p->netpoll, skb);
 769 #else
 770         BUG();
 771         return NETDEV_TX_OK;
 772 #endif
 773 }
 774
 775 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 776                                  struct sk_buff *skb)
 777 {
 778         struct dsa_switch *ds = p->dp->ds;
 779
 780         if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 781                 return;
 782
 783         if (!ds->ops->port_txtstamp)
 784                 return;
 785
 786         ds->ops->port_txtstamp(ds, p->dp->index, skb);
 787 }
 788
 789 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 790 {
 791         /* SKB for netpoll still need to be mangled with the protocol-specific
 792          * tag to be successfully transmitted
 793          */
 794         if (unlikely(netpoll_tx_running(dev)))
 795                 return dsa_slave_netpoll_send_skb(dev, skb);
 796
 797         /* Queue the SKB for transmission on the parent interface, but
 798          * do not modify its EtherType
 799          */
 800         skb->dev = dsa_slave_to_master(dev);
 801         dev_queue_xmit(skb);
 802
 803         return NETDEV_TX_OK;
 804 }
 805 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 806
 807 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 808 {
 809         int needed_headroom = dev->needed_headroom;
 810         int needed_tailroom = dev->needed_tailroom;
 811
 812         /* For tail taggers, we need to pad short frames ourselves, to ensure
 813          * that the tail tag does not fail at its role of being at the end of
 814          * the packet, once the master interface pads the frame. Account for
 815          * that pad length here, and pad later.
 816          */
 817         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 818                 needed_tailroom += ETH_ZLEN - skb->len;
 819         /* skb_headroom() returns unsigned int... */
 820         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 821         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 822
 823         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 824                 /* No reallocation needed, yay! */
 825                 return 0;
 826
 827         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 828                                 GFP_ATOMIC);
 829 }
 830
 831 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 832 {
 833         struct dsa_slave_priv *p = netdev_priv(dev);
 834         struct sk_buff *nskb;
 835
 836         dev_sw_netstats_tx_add(dev, 1, skb->len);
 837
 838         memset(skb->cb, 0, sizeof(skb->cb));
 839
 840         /* Handle tx timestamp if any */
 841         dsa_skb_tx_timestamp(p, skb);
 842
 843         if (dsa_realloc_skb(skb, dev)) {
 844                 dev_kfree_skb_any(skb);
 845                 return NETDEV_TX_OK;
 846         }
 847
 848         /* needed_tailroom should still be 'warm' in the cache line from
 849          * dsa_realloc_skb(), which has also ensured that padding is safe.
 850          */
 851         if (dev->needed_tailroom)
 852                 eth_skb_pad(skb);
 853
 854         /* Transmit function may have to reallocate the original SKB,
 855          * in which case it must have freed it. Only free it here on error.
 856          */
 857         nskb = p->xmit(skb, dev);
 858         if (!nskb) {
 859                 kfree_skb(skb);
 860                 return NETDEV_TX_OK;
 861         }
 862
 863         return dsa_enqueue_skb(nskb, dev);
 864 }
 865
 866 /* ethtool operations *******************************************************/
 867
 868 static void dsa_slave_get_drvinfo(struct net_device *dev,
 869                                   struct ethtool_drvinfo *drvinfo)
 870 {
 871         strscpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 872         strscpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 873         strscpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 874 }
 875
 876 static int dsa_slave_get_regs_len(struct net_device *dev)
 877 {
 878         struct dsa_port *dp = dsa_slave_to_port(dev);
 879         struct dsa_switch *ds = dp->ds;
 880
 881         if (ds->ops->get_regs_len)
 882                 return ds->ops->get_regs_len(ds, dp->index);
 883
 884         return -EOPNOTSUPP;
 885 }
 886
 887 static void
 888 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 889 {
 890         struct dsa_port *dp = dsa_slave_to_port(dev);
 891         struct dsa_switch *ds = dp->ds;
 892
 893         if (ds->ops->get_regs)
 894                 ds->ops->get_regs(ds, dp->index, regs, _p);
 895 }
 896
 897 static int dsa_slave_nway_reset(struct net_device *dev)
 898 {
 899         struct dsa_port *dp = dsa_slave_to_port(dev);
 900
 901         return phylink_ethtool_nway_reset(dp->pl);
 902 }
 903
 904 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 905 {
 906         struct dsa_port *dp = dsa_slave_to_port(dev);
 907         struct dsa_switch *ds = dp->ds;
 908
 909         if (ds->cd && ds->cd->eeprom_len)
 910                 return ds->cd->eeprom_len;
 911
 912         if (ds->ops->get_eeprom_len)
 913                 return ds->ops->get_eeprom_len(ds);
 914
 915         return 0;
 916 }
 917
 918 static int dsa_slave_get_eeprom(struct net_device *dev,
 919                                 struct ethtool_eeprom *eeprom, u8 *data)
 920 {
 921         struct dsa_port *dp = dsa_slave_to_port(dev);
 922         struct dsa_switch *ds = dp->ds;
 923
 924         if (ds->ops->get_eeprom)
 925                 return ds->ops->get_eeprom(ds, eeprom, data);
 926
 927         return -EOPNOTSUPP;
 928 }
 929
 930 static int dsa_slave_set_eeprom(struct net_device *dev,
 931                                 struct ethtool_eeprom *eeprom, u8 *data)
 932 {
 933         struct dsa_port *dp = dsa_slave_to_port(dev);
 934         struct dsa_switch *ds = dp->ds;
 935
 936         if (ds->ops->set_eeprom)
 937                 return ds->ops->set_eeprom(ds, eeprom, data);
 938
 939         return -EOPNOTSUPP;
 940 }
 941
 942 static void dsa_slave_get_strings(struct net_device *dev,
 943                                   uint32_t stringset, uint8_t *data)
 944 {
 945         struct dsa_port *dp = dsa_slave_to_port(dev);
 946         struct dsa_switch *ds = dp->ds;
 947
 948         if (stringset == ETH_SS_STATS) {
 949                 int len = ETH_GSTRING_LEN;
 950
 951                 strncpy(data, "tx_packets", len);
 952                 strncpy(data + len, "tx_bytes", len);
 953                 strncpy(data + 2 * len, "rx_packets", len);
 954                 strncpy(data + 3 * len, "rx_bytes", len);
 955                 if (ds->ops->get_strings)
 956                         ds->ops->get_strings(ds, dp->index, stringset,
 957                                              data + 4 * len);
 958         } else if (stringset ==  ETH_SS_TEST) {
 959                 net_selftest_get_strings(data);
 960         }
 961
 962 }
 963
 964 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 965                                         struct ethtool_stats *stats,
 966                                         uint64_t *data)
 967 {
 968         struct dsa_port *dp = dsa_slave_to_port(dev);
 969         struct dsa_switch *ds = dp->ds;
 970         struct pcpu_sw_netstats *s;
 971         unsigned int start;
 972         int i;
 973
 974         for_each_possible_cpu(i) {
 975                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 976
 977                 s = per_cpu_ptr(dev->tstats, i);
 978                 do {
 979                         start = u64_stats_fetch_begin_irq(&s->syncp);
 980                         tx_packets = u64_stats_read(&s->tx_packets);
 981                         tx_bytes = u64_stats_read(&s->tx_bytes);
 982                         rx_packets = u64_stats_read(&s->rx_packets);
 983                         rx_bytes = u64_stats_read(&s->rx_bytes);
 984                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 985                 data[0] += tx_packets;
 986                 data[1] += tx_bytes;
 987                 data[2] += rx_packets;
 988                 data[3] += rx_bytes;
 989         }
 990         if (ds->ops->get_ethtool_stats)
 991                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 992 }
 993
 994 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 995 {
 996         struct dsa_port *dp = dsa_slave_to_port(dev);
 997         struct dsa_switch *ds = dp->ds;
 998
 999         if (sset == ETH_SS_STATS) {
1000                 int count = 0;
1001
1002                 if (ds->ops->get_sset_count) {
1003                         count = ds->ops->get_sset_count(ds, dp->index, sset);
1004                         if (count < 0)
1005                                 return count;
1006                 }
1007
1008                 return count + 4;
1009         } else if (sset ==  ETH_SS_TEST) {
1010                 return net_selftest_get_count();
1011         }
1012
1013         return -EOPNOTSUPP;
1014 }
1015
1016 static void dsa_slave_get_eth_phy_stats(struct net_device *dev,
1017                                         struct ethtool_eth_phy_stats *phy_stats)
1018 {
1019         struct dsa_port *dp = dsa_slave_to_port(dev);
1020         struct dsa_switch *ds = dp->ds;
1021
1022         if (ds->ops->get_eth_phy_stats)
1023                 ds->ops->get_eth_phy_stats(ds, dp->index, phy_stats);
1024 }
1025
1026 static void dsa_slave_get_eth_mac_stats(struct net_device *dev,
1027                                         struct ethtool_eth_mac_stats *mac_stats)
1028 {
1029         struct dsa_port *dp = dsa_slave_to_port(dev);
1030         struct dsa_switch *ds = dp->ds;
1031
1032         if (ds->ops->get_eth_mac_stats)
1033                 ds->ops->get_eth_mac_stats(ds, dp->index, mac_stats);
1034 }
1035
1036 static void
1037 dsa_slave_get_eth_ctrl_stats(struct net_device *dev,
1038                              struct ethtool_eth_ctrl_stats *ctrl_stats)
1039 {
1040         struct dsa_port *dp = dsa_slave_to_port(dev);
1041         struct dsa_switch *ds = dp->ds;
1042
1043         if (ds->ops->get_eth_ctrl_stats)
1044                 ds->ops->get_eth_ctrl_stats(ds, dp->index, ctrl_stats);
1045 }
1046
1047 static void
1048 dsa_slave_get_rmon_stats(struct net_device *dev,
1049                          struct ethtool_rmon_stats *rmon_stats,
1050                          const struct ethtool_rmon_hist_range **ranges)
1051 {
1052         struct dsa_port *dp = dsa_slave_to_port(dev);
1053         struct dsa_switch *ds = dp->ds;
1054
1055         if (ds->ops->get_rmon_stats)
1056                 ds->ops->get_rmon_stats(ds, dp->index, rmon_stats, ranges);
1057 }
1058
1059 static void dsa_slave_net_selftest(struct net_device *ndev,
1060                                    struct ethtool_test *etest, u64 *buf)
1061 {
1062         struct dsa_port *dp = dsa_slave_to_port(ndev);
1063         struct dsa_switch *ds = dp->ds;
1064
1065         if (ds->ops->self_test) {
1066                 ds->ops->self_test(ds, dp->index, etest, buf);
1067                 return;
1068         }
1069
1070         net_selftest(ndev, etest, buf);
1071 }
1072
1073 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1074 {
1075         struct dsa_port *dp = dsa_slave_to_port(dev);
1076         struct dsa_switch *ds = dp->ds;
1077
1078         phylink_ethtool_get_wol(dp->pl, w);
1079
1080         if (ds->ops->get_wol)
1081                 ds->ops->get_wol(ds, dp->index, w);
1082 }
1083
1084 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1085 {
1086         struct dsa_port *dp = dsa_slave_to_port(dev);
1087         struct dsa_switch *ds = dp->ds;
1088         int ret = -EOPNOTSUPP;
1089
1090         phylink_ethtool_set_wol(dp->pl, w);
1091
1092         if (ds->ops->set_wol)
1093                 ret = ds->ops->set_wol(ds, dp->index, w);
1094
1095         return ret;
1096 }
1097
1098 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
1099 {
1100         struct dsa_port *dp = dsa_slave_to_port(dev);
1101         struct dsa_switch *ds = dp->ds;
1102         int ret;
1103
1104         /* Port's PHY and MAC both need to be EEE capable */
1105         if (!dev->phydev || !dp->pl)
1106                 return -ENODEV;
1107
1108         if (!ds->ops->set_mac_eee)
1109                 return -EOPNOTSUPP;
1110
1111         ret = ds->ops->set_mac_eee(ds, dp->index, e);
1112         if (ret)
1113                 return ret;
1114
1115         return phylink_ethtool_set_eee(dp->pl, e);
1116 }
1117
1118 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
1119 {
1120         struct dsa_port *dp = dsa_slave_to_port(dev);
1121         struct dsa_switch *ds = dp->ds;
1122         int ret;
1123
1124         /* Port's PHY and MAC both need to be EEE capable */
1125         if (!dev->phydev || !dp->pl)
1126                 return -ENODEV;
1127
1128         if (!ds->ops->get_mac_eee)
1129                 return -EOPNOTSUPP;
1130
1131         ret = ds->ops->get_mac_eee(ds, dp->index, e);
1132         if (ret)
1133                 return ret;
1134
1135         return phylink_ethtool_get_eee(dp->pl, e);
1136 }
1137
1138 static int dsa_slave_get_link_ksettings(struct net_device *dev,
1139                                         struct ethtool_link_ksettings *cmd)
1140 {
1141         struct dsa_port *dp = dsa_slave_to_port(dev);
1142
1143         return phylink_ethtool_ksettings_get(dp->pl, cmd);
1144 }
1145
1146 static int dsa_slave_set_link_ksettings(struct net_device *dev,
1147                                         const struct ethtool_link_ksettings *cmd)
1148 {
1149         struct dsa_port *dp = dsa_slave_to_port(dev);
1150
1151         return phylink_ethtool_ksettings_set(dp->pl, cmd);
1152 }
1153
1154 static void dsa_slave_get_pause_stats(struct net_device *dev,
1155                                   struct ethtool_pause_stats *pause_stats)
1156 {
1157         struct dsa_port *dp = dsa_slave_to_port(dev);
1158         struct dsa_switch *ds = dp->ds;
1159
1160         if (ds->ops->get_pause_stats)
1161                 ds->ops->get_pause_stats(ds, dp->index, pause_stats);
1162 }
1163
1164 static void dsa_slave_get_pauseparam(struct net_device *dev,
1165                                      struct ethtool_pauseparam *pause)
1166 {
1167         struct dsa_port *dp = dsa_slave_to_port(dev);
1168
1169         phylink_ethtool_get_pauseparam(dp->pl, pause);
1170 }
1171
1172 static int dsa_slave_set_pauseparam(struct net_device *dev,
1173                                     struct ethtool_pauseparam *pause)
1174 {
1175         struct dsa_port *dp = dsa_slave_to_port(dev);
1176
1177         return phylink_ethtool_set_pauseparam(dp->pl, pause);
1178 }
1179
1180 #ifdef CONFIG_NET_POLL_CONTROLLER
1181 static int dsa_slave_netpoll_setup(struct net_device *dev,
1182                                    struct netpoll_info *ni)
1183 {
1184         struct net_device *master = dsa_slave_to_master(dev);
1185         struct dsa_slave_priv *p = netdev_priv(dev);
1186         struct netpoll *netpoll;
1187         int err = 0;
1188
1189         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1190         if (!netpoll)
1191                 return -ENOMEM;
1192
1193         err = __netpoll_setup(netpoll, master);
1194         if (err) {
1195                 kfree(netpoll);
1196                 goto out;
1197         }
1198
1199         p->netpoll = netpoll;
1200 out:
1201         return err;
1202 }
1203
1204 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
1205 {
1206         struct dsa_slave_priv *p = netdev_priv(dev);
1207         struct netpoll *netpoll = p->netpoll;
1208
1209         if (!netpoll)
1210                 return;
1211
1212         p->netpoll = NULL;
1213
1214         __netpoll_free(netpoll);
1215 }
1216
1217 static void dsa_slave_poll_controller(struct net_device *dev)
1218 {
1219 }
1220 #endif
1221
1222 static struct dsa_mall_tc_entry *
1223 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
1224 {
1225         struct dsa_slave_priv *p = netdev_priv(dev);
1226         struct dsa_mall_tc_entry *mall_tc_entry;
1227
1228         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
1229                 if (mall_tc_entry->cookie == cookie)
1230                         return mall_tc_entry;
1231
1232         return NULL;
1233 }
1234
1235 static int
1236 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
1237                                   struct tc_cls_matchall_offload *cls,
1238                                   bool ingress)
1239 {
1240         struct netlink_ext_ack *extack = cls->common.extack;
1241         struct dsa_port *dp = dsa_slave_to_port(dev);
1242         struct dsa_slave_priv *p = netdev_priv(dev);
1243         struct dsa_mall_mirror_tc_entry *mirror;
1244         struct dsa_mall_tc_entry *mall_tc_entry;
1245         struct dsa_switch *ds = dp->ds;
1246         struct flow_action_entry *act;
1247         struct dsa_port *to_dp;
1248         int err;
1249
1250         if (!ds->ops->port_mirror_add)
1251                 return -EOPNOTSUPP;
1252
1253         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1254                                               cls->common.extack))
1255                 return -EOPNOTSUPP;
1256
1257         act = &cls->rule->action.entries[0];
1258
1259         if (!act->dev)
1260                 return -EINVAL;
1261
1262         if (!dsa_slave_dev_check(act->dev))
1263                 return -EOPNOTSUPP;
1264
1265         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1266         if (!mall_tc_entry)
1267                 return -ENOMEM;
1268
1269         mall_tc_entry->cookie = cls->cookie;
1270         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1271         mirror = &mall_tc_entry->mirror;
1272
1273         to_dp = dsa_slave_to_port(act->dev);
1274
1275         mirror->to_local_port = to_dp->index;
1276         mirror->ingress = ingress;
1277
1278         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress, extack);
1279         if (err) {
1280                 kfree(mall_tc_entry);
1281                 return err;
1282         }
1283
1284         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1285
1286         return err;
1287 }
1288
1289 static int
1290 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1291                                   struct tc_cls_matchall_offload *cls,
1292                                   bool ingress)
1293 {
1294         struct netlink_ext_ack *extack = cls->common.extack;
1295         struct dsa_port *dp = dsa_slave_to_port(dev);
1296         struct dsa_slave_priv *p = netdev_priv(dev);
1297         struct dsa_mall_policer_tc_entry *policer;
1298         struct dsa_mall_tc_entry *mall_tc_entry;
1299         struct dsa_switch *ds = dp->ds;
1300         struct flow_action_entry *act;
1301         int err;
1302
1303         if (!ds->ops->port_policer_add) {
1304                 NL_SET_ERR_MSG_MOD(extack,
1305                                    "Policing offload not implemented");
1306                 return -EOPNOTSUPP;
1307         }
1308
1309         if (!ingress) {
1310                 NL_SET_ERR_MSG_MOD(extack,
1311                                    "Only supported on ingress qdisc");
1312                 return -EOPNOTSUPP;
1313         }
1314
1315         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1316                                               cls->common.extack))
1317                 return -EOPNOTSUPP;
1318
1319         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1320                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1321                         NL_SET_ERR_MSG_MOD(extack,
1322                                            "Only one port policer allowed");
1323                         return -EEXIST;
1324                 }
1325         }
1326
1327         act = &cls->rule->action.entries[0];
1328
1329         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1330         if (!mall_tc_entry)
1331                 return -ENOMEM;
1332
1333         mall_tc_entry->cookie = cls->cookie;
1334         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1335         policer = &mall_tc_entry->policer;
1336         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1337         policer->burst = act->police.burst;
1338
1339         err = ds->ops->port_policer_add(ds, dp->index, policer);
1340         if (err) {
1341                 kfree(mall_tc_entry);
1342                 return err;
1343         }
1344
1345         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1346
1347         return err;
1348 }
1349
1350 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1351                                       struct tc_cls_matchall_offload *cls,
1352                                       bool ingress)
1353 {
1354         int err = -EOPNOTSUPP;
1355
1356         if (cls->common.protocol == htons(ETH_P_ALL) &&
1357             flow_offload_has_one_action(&cls->rule->action) &&
1358             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1359                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1360         else if (flow_offload_has_one_action(&cls->rule->action) &&
1361                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1362                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1363
1364         return err;
1365 }
1366
1367 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1368                                        struct tc_cls_matchall_offload *cls)
1369 {
1370         struct dsa_port *dp = dsa_slave_to_port(dev);
1371         struct dsa_mall_tc_entry *mall_tc_entry;
1372         struct dsa_switch *ds = dp->ds;
1373
1374         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1375         if (!mall_tc_entry)
1376                 return;
1377
1378         list_del(&mall_tc_entry->list);
1379
1380         switch (mall_tc_entry->type) {
1381         case DSA_PORT_MALL_MIRROR:
1382                 if (ds->ops->port_mirror_del)
1383                         ds->ops->port_mirror_del(ds, dp->index,
1384                                                  &mall_tc_entry->mirror);
1385                 break;
1386         case DSA_PORT_MALL_POLICER:
1387                 if (ds->ops->port_policer_del)
1388                         ds->ops->port_policer_del(ds, dp->index);
1389                 break;
1390         default:
1391                 WARN_ON(1);
1392         }
1393
1394         kfree(mall_tc_entry);
1395 }
1396
1397 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1398                                            struct tc_cls_matchall_offload *cls,
1399                                            bool ingress)
1400 {
1401         if (cls->common.chain_index)
1402                 return -EOPNOTSUPP;
1403
1404         switch (cls->command) {
1405         case TC_CLSMATCHALL_REPLACE:
1406                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1407         case TC_CLSMATCHALL_DESTROY:
1408                 dsa_slave_del_cls_matchall(dev, cls);
1409                 return 0;
1410         default:
1411                 return -EOPNOTSUPP;
1412         }
1413 }
1414
1415 static int dsa_slave_add_cls_flower(struct net_device *dev,
1416                                     struct flow_cls_offload *cls,
1417                                     bool ingress)
1418 {
1419         struct dsa_port *dp = dsa_slave_to_port(dev);
1420         struct dsa_switch *ds = dp->ds;
1421         int port = dp->index;
1422
1423         if (!ds->ops->cls_flower_add)
1424                 return -EOPNOTSUPP;
1425
1426         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1427 }
1428
1429 static int dsa_slave_del_cls_flower(struct net_device *dev,
1430                                     struct flow_cls_offload *cls,
1431                                     bool ingress)
1432 {
1433         struct dsa_port *dp = dsa_slave_to_port(dev);
1434         struct dsa_switch *ds = dp->ds;
1435         int port = dp->index;
1436
1437         if (!ds->ops->cls_flower_del)
1438                 return -EOPNOTSUPP;
1439
1440         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1441 }
1442
1443 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1444                                       struct flow_cls_offload *cls,
1445                                       bool ingress)
1446 {
1447         struct dsa_port *dp = dsa_slave_to_port(dev);
1448         struct dsa_switch *ds = dp->ds;
1449         int port = dp->index;
1450
1451         if (!ds->ops->cls_flower_stats)
1452                 return -EOPNOTSUPP;
1453
1454         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1455 }
1456
1457 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1458                                          struct flow_cls_offload *cls,
1459                                          bool ingress)
1460 {
1461         switch (cls->command) {
1462         case FLOW_CLS_REPLACE:
1463                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1464         case FLOW_CLS_DESTROY:
1465                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1466         case FLOW_CLS_STATS:
1467                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1468         default:
1469                 return -EOPNOTSUPP;
1470         }
1471 }
1472
1473 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1474                                        void *cb_priv, bool ingress)
1475 {
1476         struct net_device *dev = cb_priv;
1477
1478         if (!tc_can_offload(dev))
1479                 return -EOPNOTSUPP;
1480
1481         switch (type) {
1482         case TC_SETUP_CLSMATCHALL:
1483                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1484         case TC_SETUP_CLSFLOWER:
1485                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1486         default:
1487                 return -EOPNOTSUPP;
1488         }
1489 }
1490
1491 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1492                                           void *type_data, void *cb_priv)
1493 {
1494         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1495 }
1496
1497 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1498                                           void *type_data, void *cb_priv)
1499 {
1500         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1501 }
1502
1503 static LIST_HEAD(dsa_slave_block_cb_list);
1504
1505 static int dsa_slave_setup_tc_block(struct net_device *dev,
1506                                     struct flow_block_offload *f)
1507 {
1508         struct flow_block_cb *block_cb;
1509         flow_setup_cb_t *cb;
1510
1511         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1512                 cb = dsa_slave_setup_tc_block_cb_ig;
1513         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1514                 cb = dsa_slave_setup_tc_block_cb_eg;
1515         else
1516                 return -EOPNOTSUPP;
1517
1518         f->driver_block_list = &dsa_slave_block_cb_list;
1519
1520         switch (f->command) {
1521         case FLOW_BLOCK_BIND:
1522                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1523                         return -EBUSY;
1524
1525                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1526                 if (IS_ERR(block_cb))
1527                         return PTR_ERR(block_cb);
1528
1529                 flow_block_cb_add(block_cb, f);
1530                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1531                 return 0;
1532         case FLOW_BLOCK_UNBIND:
1533                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1534                 if (!block_cb)
1535                         return -ENOENT;
1536
1537                 flow_block_cb_remove(block_cb, f);
1538                 list_del(&block_cb->driver_list);
1539                 return 0;
1540         default:
1541                 return -EOPNOTSUPP;
1542         }
1543 }
1544
1545 static int dsa_slave_setup_ft_block(struct dsa_switch *ds, int port,
1546                                     void *type_data)
1547 {
1548         struct net_device *master = dsa_port_to_master(dsa_to_port(ds, port));
1549
1550         if (!master->netdev_ops->ndo_setup_tc)
1551                 return -EOPNOTSUPP;
1552
1553         return master->netdev_ops->ndo_setup_tc(master, TC_SETUP_FT, type_data);
1554 }
1555
1556 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1557                               void *type_data)
1558 {
1559         struct dsa_port *dp = dsa_slave_to_port(dev);
1560         struct dsa_switch *ds = dp->ds;
1561
1562         switch (type) {
1563         case TC_SETUP_BLOCK:
1564                 return dsa_slave_setup_tc_block(dev, type_data);
1565         case TC_SETUP_FT:
1566                 return dsa_slave_setup_ft_block(ds, dp->index, type_data);
1567         default:
1568                 break;
1569         }
1570
1571         if (!ds->ops->port_setup_tc)
1572                 return -EOPNOTSUPP;
1573
1574         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1575 }
1576
1577 static int dsa_slave_get_rxnfc(struct net_device *dev,
1578                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1579 {
1580         struct dsa_port *dp = dsa_slave_to_port(dev);
1581         struct dsa_switch *ds = dp->ds;
1582
1583         if (!ds->ops->get_rxnfc)
1584                 return -EOPNOTSUPP;
1585
1586         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1587 }
1588
1589 static int dsa_slave_set_rxnfc(struct net_device *dev,
1590                                struct ethtool_rxnfc *nfc)
1591 {
1592         struct dsa_port *dp = dsa_slave_to_port(dev);
1593         struct dsa_switch *ds = dp->ds;
1594
1595         if (!ds->ops->set_rxnfc)
1596                 return -EOPNOTSUPP;
1597
1598         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1599 }
1600
1601 static int dsa_slave_get_ts_info(struct net_device *dev,
1602                                  struct ethtool_ts_info *ts)
1603 {
1604         struct dsa_slave_priv *p = netdev_priv(dev);
1605         struct dsa_switch *ds = p->dp->ds;
1606
1607         if (!ds->ops->get_ts_info)
1608                 return -EOPNOTSUPP;
1609
1610         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1611 }
1612
1613 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1614                                      u16 vid)
1615 {
1616         struct dsa_port *dp = dsa_slave_to_port(dev);
1617         struct switchdev_obj_port_vlan vlan = {
1618                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1619                 .vid = vid,
1620                 /* This API only allows programming tagged, non-PVID VIDs */
1621                 .flags = 0,
1622         };
1623         struct netlink_ext_ack extack = {0};
1624         int ret;
1625
1626         /* User port... */
1627         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1628         if (ret) {
1629                 if (extack._msg)
1630                         netdev_err(dev, "%s\n", extack._msg);
1631                 return ret;
1632         }
1633
1634         /* And CPU port... */
1635         ret = dsa_port_host_vlan_add(dp, &vlan, &extack);
1636         if (ret) {
1637                 if (extack._msg)
1638                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1639                                    extack._msg);
1640                 return ret;
1641         }
1642
1643         return 0;
1644 }
1645
1646 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1647                                       u16 vid)
1648 {
1649         struct dsa_port *dp = dsa_slave_to_port(dev);
1650         struct switchdev_obj_port_vlan vlan = {
1651                 .vid = vid,
1652                 /* This API only allows programming tagged, non-PVID VIDs */
1653                 .flags = 0,
1654         };
1655         int err;
1656
1657         err = dsa_port_vlan_del(dp, &vlan);
1658         if (err)
1659                 return err;
1660
1661         return dsa_port_host_vlan_del(dp, &vlan);
1662 }
1663
1664 static int dsa_slave_restore_vlan(struct net_device *vdev, int vid, void *arg)
1665 {
1666         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1667
1668         return dsa_slave_vlan_rx_add_vid(arg, proto, vid);
1669 }
1670
1671 static int dsa_slave_clear_vlan(struct net_device *vdev, int vid, void *arg)
1672 {
1673         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1674
1675         return dsa_slave_vlan_rx_kill_vid(arg, proto, vid);
1676 }
1677
1678 /* Keep the VLAN RX filtering list in sync with the hardware only if VLAN
1679  * filtering is enabled. The baseline is that only ports that offload a
1680  * VLAN-aware bridge are VLAN-aware, and standalone ports are VLAN-unaware,
1681  * but there are exceptions for quirky hardware.
1682  *
1683  * If ds->vlan_filtering_is_global = true, then standalone ports which share
1684  * the same switch with other ports that offload a VLAN-aware bridge are also
1685  * inevitably VLAN-aware.
1686  *
1687  * To summarize, a DSA switch port offloads:
1688  *
1689  * - If standalone (this includes software bridge, software LAG):
1690  *     - if ds->needs_standalone_vlan_filtering = true, OR if
1691  *       (ds->vlan_filtering_is_global = true AND there are bridges spanning
1692  *       this switch chip which have vlan_filtering=1)
1693  *         - the 8021q upper VLANs
1694  *     - else (standalone VLAN filtering is not needed, VLAN filtering is not
1695  *       global, or it is, but no port is under a VLAN-aware bridge):
1696  *         - no VLAN (any 8021q upper is a software VLAN)
1697  *
1698  * - If under a vlan_filtering=0 bridge which it offload:
1699  *     - if ds->configure_vlan_while_not_filtering = true (default):
1700  *         - the bridge VLANs. These VLANs are committed to hardware but inactive.
1701  *     - else (deprecated):
1702  *         - no VLAN. The bridge VLANs are not restored when VLAN awareness is
1703  *           enabled, so this behavior is broken and discouraged.
1704  *
1705  * - If under a vlan_filtering=1 bridge which it offload:
1706  *     - the bridge VLANs
1707  *     - the 8021q upper VLANs
1708  */
1709 int dsa_slave_manage_vlan_filtering(struct net_device *slave,
1710                                     bool vlan_filtering)
1711 {
1712         int err;
1713
1714         if (vlan_filtering) {
1715                 slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1716
1717                 err = vlan_for_each(slave, dsa_slave_restore_vlan, slave);
1718                 if (err) {
1719                         vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1720                         slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1721                         return err;
1722                 }
1723         } else {
1724                 err = vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1725                 if (err)
1726                         return err;
1727
1728                 slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1729         }
1730
1731         return 0;
1732 }
1733
1734 struct dsa_hw_port {
1735         struct list_head list;
1736         struct net_device *dev;
1737         int old_mtu;
1738 };
1739
1740 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1741 {
1742         const struct dsa_hw_port *p;
1743         int err;
1744
1745         list_for_each_entry(p, hw_port_list, list) {
1746                 if (p->dev->mtu == mtu)
1747                         continue;
1748
1749                 err = dev_set_mtu(p->dev, mtu);
1750                 if (err)
1751                         goto rollback;
1752         }
1753
1754         return 0;
1755
1756 rollback:
1757         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1758                 if (p->dev->mtu == p->old_mtu)
1759                         continue;
1760
1761                 if (dev_set_mtu(p->dev, p->old_mtu))
1762                         netdev_err(p->dev, "Failed to restore MTU\n");
1763         }
1764
1765         return err;
1766 }
1767
1768 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1769 {
1770         struct dsa_hw_port *p, *n;
1771
1772         list_for_each_entry_safe(p, n, hw_port_list, list)
1773                 kfree(p);
1774 }
1775
1776 /* Make the hardware datapath to/from @dev limited to a common MTU */
1777 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1778 {
1779         struct list_head hw_port_list;
1780         struct dsa_switch_tree *dst;
1781         int min_mtu = ETH_MAX_MTU;
1782         struct dsa_port *other_dp;
1783         int err;
1784
1785         if (!dp->ds->mtu_enforcement_ingress)
1786                 return;
1787
1788         if (!dp->bridge)
1789                 return;
1790
1791         INIT_LIST_HEAD(&hw_port_list);
1792
1793         /* Populate the list of ports that are part of the same bridge
1794          * as the newly added/modified port
1795          */
1796         list_for_each_entry(dst, &dsa_tree_list, list) {
1797                 list_for_each_entry(other_dp, &dst->ports, list) {
1798                         struct dsa_hw_port *hw_port;
1799                         struct net_device *slave;
1800
1801                         if (other_dp->type != DSA_PORT_TYPE_USER)
1802                                 continue;
1803
1804                         if (!dsa_port_bridge_same(dp, other_dp))
1805                                 continue;
1806
1807                         if (!other_dp->ds->mtu_enforcement_ingress)
1808                                 continue;
1809
1810                         slave = other_dp->slave;
1811
1812                         if (min_mtu > slave->mtu)
1813                                 min_mtu = slave->mtu;
1814
1815                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1816                         if (!hw_port)
1817                                 goto out;
1818
1819                         hw_port->dev = slave;
1820                         hw_port->old_mtu = slave->mtu;
1821
1822                         list_add(&hw_port->list, &hw_port_list);
1823                 }
1824         }
1825
1826         /* Attempt to configure the entire hardware bridge to the newly added
1827          * interface's MTU first, regardless of whether the intention of the
1828          * user was to raise or lower it.
1829          */
1830         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1831         if (!err)
1832                 goto out;
1833
1834         /* Clearly that didn't work out so well, so just set the minimum MTU on
1835          * all hardware bridge ports now. If this fails too, then all ports will
1836          * still have their old MTU rolled back anyway.
1837          */
1838         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1839
1840 out:
1841         dsa_hw_port_list_free(&hw_port_list);
1842 }
1843
1844 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1845 {
1846         struct net_device *master = dsa_slave_to_master(dev);
1847         struct dsa_port *dp = dsa_slave_to_port(dev);
1848         struct dsa_port *cpu_dp = dp->cpu_dp;
1849         struct dsa_switch *ds = dp->ds;
1850         struct dsa_port *other_dp;
1851         int largest_mtu = 0;
1852         int new_master_mtu;
1853         int old_master_mtu;
1854         int mtu_limit;
1855         int overhead;
1856         int cpu_mtu;
1857         int err;
1858
1859         if (!ds->ops->port_change_mtu)
1860                 return -EOPNOTSUPP;
1861
1862         dsa_tree_for_each_user_port(other_dp, ds->dst) {
1863                 int slave_mtu;
1864
1865                 /* During probe, this function will be called for each slave
1866                  * device, while not all of them have been allocated. That's
1867                  * ok, it doesn't change what the maximum is, so ignore it.
1868                  */
1869                 if (!other_dp->slave)
1870                         continue;
1871
1872                 /* Pretend that we already applied the setting, which we
1873                  * actually haven't (still haven't done all integrity checks)
1874                  */
1875                 if (dp == other_dp)
1876                         slave_mtu = new_mtu;
1877                 else
1878                         slave_mtu = other_dp->slave->mtu;
1879
1880                 if (largest_mtu < slave_mtu)
1881                         largest_mtu = slave_mtu;
1882         }
1883
1884         overhead = dsa_tag_protocol_overhead(cpu_dp->tag_ops);
1885         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu + overhead);
1886         old_master_mtu = master->mtu;
1887         new_master_mtu = largest_mtu + overhead;
1888         if (new_master_mtu > mtu_limit)
1889                 return -ERANGE;
1890
1891         /* If the master MTU isn't over limit, there's no need to check the CPU
1892          * MTU, since that surely isn't either.
1893          */
1894         cpu_mtu = largest_mtu;
1895
1896         /* Start applying stuff */
1897         if (new_master_mtu != old_master_mtu) {
1898                 err = dev_set_mtu(master, new_master_mtu);
1899                 if (err < 0)
1900                         goto out_master_failed;
1901
1902                 /* We only need to propagate the MTU of the CPU port to
1903                  * upstream switches, so emit a notifier which updates them.
1904                  */
1905                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu);
1906                 if (err)
1907                         goto out_cpu_failed;
1908         }
1909
1910         err = ds->ops->port_change_mtu(ds, dp->index, new_mtu);
1911         if (err)
1912                 goto out_port_failed;
1913
1914         dev->mtu = new_mtu;
1915
1916         dsa_bridge_mtu_normalization(dp);
1917
1918         return 0;
1919
1920 out_port_failed:
1921         if (new_master_mtu != old_master_mtu)
1922                 dsa_port_mtu_change(cpu_dp, old_master_mtu - overhead);
1923 out_cpu_failed:
1924         if (new_master_mtu != old_master_mtu)
1925                 dev_set_mtu(master, old_master_mtu);
1926 out_master_failed:
1927         return err;
1928 }
1929
1930 static int __maybe_unused
1931 dsa_slave_dcbnl_set_default_prio(struct net_device *dev, struct dcb_app *app)
1932 {
1933         struct dsa_port *dp = dsa_slave_to_port(dev);
1934         struct dsa_switch *ds = dp->ds;
1935         unsigned long mask, new_prio;
1936         int err, port = dp->index;
1937
1938         if (!ds->ops->port_set_default_prio)
1939                 return -EOPNOTSUPP;
1940
1941         err = dcb_ieee_setapp(dev, app);
1942         if (err)
1943                 return err;
1944
1945         mask = dcb_ieee_getapp_mask(dev, app);
1946         new_prio = __fls(mask);
1947
1948         err = ds->ops->port_set_default_prio(ds, port, new_prio);
1949         if (err) {
1950                 dcb_ieee_delapp(dev, app);
1951                 return err;
1952         }
1953
1954         return 0;
1955 }
1956
1957 static int __maybe_unused
1958 dsa_slave_dcbnl_add_dscp_prio(struct net_device *dev, struct dcb_app *app)
1959 {
1960         struct dsa_port *dp = dsa_slave_to_port(dev);
1961         struct dsa_switch *ds = dp->ds;
1962         unsigned long mask, new_prio;
1963         int err, port = dp->index;
1964         u8 dscp = app->protocol;
1965
1966         if (!ds->ops->port_add_dscp_prio)
1967                 return -EOPNOTSUPP;
1968
1969         if (dscp >= 64) {
1970                 netdev_err(dev, "DSCP APP entry with protocol value %u is invalid\n",
1971                            dscp);
1972                 return -EINVAL;
1973         }
1974
1975         err = dcb_ieee_setapp(dev, app);
1976         if (err)
1977                 return err;
1978
1979         mask = dcb_ieee_getapp_mask(dev, app);
1980         new_prio = __fls(mask);
1981
1982         err = ds->ops->port_add_dscp_prio(ds, port, dscp, new_prio);
1983         if (err) {
1984                 dcb_ieee_delapp(dev, app);
1985                 return err;
1986         }
1987
1988         return 0;
1989 }
1990
1991 static int __maybe_unused dsa_slave_dcbnl_ieee_setapp(struct net_device *dev,
1992                                                       struct dcb_app *app)
1993 {
1994         switch (app->selector) {
1995         case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
1996                 switch (app->protocol) {
1997                 case 0:
1998                         return dsa_slave_dcbnl_set_default_prio(dev, app);
1999                 default:
2000                         return -EOPNOTSUPP;
2001                 }
2002                 break;
2003         case IEEE_8021QAZ_APP_SEL_DSCP:
2004                 return dsa_slave_dcbnl_add_dscp_prio(dev, app);
2005         default:
2006                 return -EOPNOTSUPP;
2007         }
2008 }
2009
2010 static int __maybe_unused
2011 dsa_slave_dcbnl_del_default_prio(struct net_device *dev, struct dcb_app *app)
2012 {
2013         struct dsa_port *dp = dsa_slave_to_port(dev);
2014         struct dsa_switch *ds = dp->ds;
2015         unsigned long mask, new_prio;
2016         int err, port = dp->index;
2017
2018         if (!ds->ops->port_set_default_prio)
2019                 return -EOPNOTSUPP;
2020
2021         err = dcb_ieee_delapp(dev, app);
2022         if (err)
2023                 return err;
2024
2025         mask = dcb_ieee_getapp_mask(dev, app);
2026         new_prio = mask ? __fls(mask) : 0;
2027
2028         err = ds->ops->port_set_default_prio(ds, port, new_prio);
2029         if (err) {
2030                 dcb_ieee_setapp(dev, app);
2031                 return err;
2032         }
2033
2034         return 0;
2035 }
2036
2037 static int __maybe_unused
2038 dsa_slave_dcbnl_del_dscp_prio(struct net_device *dev, struct dcb_app *app)
2039 {
2040         struct dsa_port *dp = dsa_slave_to_port(dev);
2041         struct dsa_switch *ds = dp->ds;
2042         int err, port = dp->index;
2043         u8 dscp = app->protocol;
2044
2045         if (!ds->ops->port_del_dscp_prio)
2046                 return -EOPNOTSUPP;
2047
2048         err = dcb_ieee_delapp(dev, app);
2049         if (err)
2050                 return err;
2051
2052         err = ds->ops->port_del_dscp_prio(ds, port, dscp, app->priority);
2053         if (err) {
2054                 dcb_ieee_setapp(dev, app);
2055                 return err;
2056         }
2057
2058         return 0;
2059 }
2060
2061 static int __maybe_unused dsa_slave_dcbnl_ieee_delapp(struct net_device *dev,
2062                                                       struct dcb_app *app)
2063 {
2064         switch (app->selector) {
2065         case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
2066                 switch (app->protocol) {
2067                 case 0:
2068                         return dsa_slave_dcbnl_del_default_prio(dev, app);
2069                 default:
2070                         return -EOPNOTSUPP;
2071                 }
2072                 break;
2073         case IEEE_8021QAZ_APP_SEL_DSCP:
2074                 return dsa_slave_dcbnl_del_dscp_prio(dev, app);
2075         default:
2076                 return -EOPNOTSUPP;
2077         }
2078 }
2079
2080 /* Pre-populate the DCB application priority table with the priorities
2081  * configured during switch setup, which we read from hardware here.
2082  */
2083 static int dsa_slave_dcbnl_init(struct net_device *dev)
2084 {
2085         struct dsa_port *dp = dsa_slave_to_port(dev);
2086         struct dsa_switch *ds = dp->ds;
2087         int port = dp->index;
2088         int err;
2089
2090         if (ds->ops->port_get_default_prio) {
2091                 int prio = ds->ops->port_get_default_prio(ds, port);
2092                 struct dcb_app app = {
2093                         .selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE,
2094                         .protocol = 0,
2095                         .priority = prio,
2096                 };
2097
2098                 if (prio < 0)
2099                         return prio;
2100
2101                 err = dcb_ieee_setapp(dev, &app);
2102                 if (err)
2103                         return err;
2104         }
2105
2106         if (ds->ops->port_get_dscp_prio) {
2107                 int protocol;
2108
2109                 for (protocol = 0; protocol < 64; protocol++) {
2110                         struct dcb_app app = {
2111                                 .selector = IEEE_8021QAZ_APP_SEL_DSCP,
2112                                 .protocol = protocol,
2113                         };
2114                         int prio;
2115
2116                         prio = ds->ops->port_get_dscp_prio(ds, port, protocol);
2117                         if (prio == -EOPNOTSUPP)
2118                                 continue;
2119                         if (prio < 0)
2120                                 return prio;
2121
2122                         app.priority = prio;
2123
2124                         err = dcb_ieee_setapp(dev, &app);
2125                         if (err)
2126                                 return err;
2127                 }
2128         }
2129
2130         return 0;
2131 }
2132
2133 static const struct ethtool_ops dsa_slave_ethtool_ops = {
2134         .get_drvinfo            = dsa_slave_get_drvinfo,
2135         .get_regs_len           = dsa_slave_get_regs_len,
2136         .get_regs               = dsa_slave_get_regs,
2137         .nway_reset             = dsa_slave_nway_reset,
2138         .get_link               = ethtool_op_get_link,
2139         .get_eeprom_len         = dsa_slave_get_eeprom_len,
2140         .get_eeprom             = dsa_slave_get_eeprom,
2141         .set_eeprom             = dsa_slave_set_eeprom,
2142         .get_strings            = dsa_slave_get_strings,
2143         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
2144         .get_sset_count         = dsa_slave_get_sset_count,
2145         .get_eth_phy_stats      = dsa_slave_get_eth_phy_stats,
2146         .get_eth_mac_stats      = dsa_slave_get_eth_mac_stats,
2147         .get_eth_ctrl_stats     = dsa_slave_get_eth_ctrl_stats,
2148         .get_rmon_stats         = dsa_slave_get_rmon_stats,
2149         .set_wol                = dsa_slave_set_wol,
2150         .get_wol                = dsa_slave_get_wol,
2151         .set_eee                = dsa_slave_set_eee,
2152         .get_eee                = dsa_slave_get_eee,
2153         .get_link_ksettings     = dsa_slave_get_link_ksettings,
2154         .set_link_ksettings     = dsa_slave_set_link_ksettings,
2155         .get_pause_stats        = dsa_slave_get_pause_stats,
2156         .get_pauseparam         = dsa_slave_get_pauseparam,
2157         .set_pauseparam         = dsa_slave_set_pauseparam,
2158         .get_rxnfc              = dsa_slave_get_rxnfc,
2159         .set_rxnfc              = dsa_slave_set_rxnfc,
2160         .get_ts_info            = dsa_slave_get_ts_info,
2161         .self_test              = dsa_slave_net_selftest,
2162 };
2163
2164 static const struct dcbnl_rtnl_ops __maybe_unused dsa_slave_dcbnl_ops = {
2165         .ieee_setapp            = dsa_slave_dcbnl_ieee_setapp,
2166         .ieee_delapp            = dsa_slave_dcbnl_ieee_delapp,
2167 };
2168
2169 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
2170 {
2171         struct dsa_port *dp = dsa_slave_to_port(dev);
2172
2173         return &dp->devlink_port;
2174 }
2175
2176 static void dsa_slave_get_stats64(struct net_device *dev,
2177                                   struct rtnl_link_stats64 *s)
2178 {
2179         struct dsa_port *dp = dsa_slave_to_port(dev);
2180         struct dsa_switch *ds = dp->ds;
2181
2182         if (ds->ops->get_stats64)
2183                 ds->ops->get_stats64(ds, dp->index, s);
2184         else
2185                 dev_get_tstats64(dev, s);
2186 }
2187
2188 static int dsa_slave_fill_forward_path(struct net_device_path_ctx *ctx,
2189                                        struct net_device_path *path)
2190 {
2191         struct dsa_port *dp = dsa_slave_to_port(ctx->dev);
2192         struct net_device *master = dsa_port_to_master(dp);
2193         struct dsa_port *cpu_dp = dp->cpu_dp;
2194
2195         path->dev = ctx->dev;
2196         path->type = DEV_PATH_DSA;
2197         path->dsa.proto = cpu_dp->tag_ops->proto;
2198         path->dsa.port = dp->index;
2199         ctx->dev = master;
2200
2201         return 0;
2202 }
2203
2204 static const struct net_device_ops dsa_slave_netdev_ops = {
2205         .ndo_open               = dsa_slave_open,
2206         .ndo_stop               = dsa_slave_close,
2207         .ndo_start_xmit         = dsa_slave_xmit,
2208         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
2209         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
2210         .ndo_set_mac_address    = dsa_slave_set_mac_address,
2211         .ndo_fdb_dump           = dsa_slave_fdb_dump,
2212         .ndo_eth_ioctl          = dsa_slave_ioctl,
2213         .ndo_get_iflink         = dsa_slave_get_iflink,
2214 #ifdef CONFIG_NET_POLL_CONTROLLER
2215         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
2216         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
2217         .ndo_poll_controller    = dsa_slave_poll_controller,
2218 #endif
2219         .ndo_setup_tc           = dsa_slave_setup_tc,
2220         .ndo_get_stats64        = dsa_slave_get_stats64,
2221         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
2222         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
2223         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
2224         .ndo_change_mtu         = dsa_slave_change_mtu,
2225         .ndo_fill_forward_path  = dsa_slave_fill_forward_path,
2226 };
2227
2228 static struct device_type dsa_type = {
2229         .name   = "dsa",
2230 };
2231
2232 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
2233 {
2234         const struct dsa_port *dp = dsa_to_port(ds, port);
2235
2236         if (dp->pl)
2237                 phylink_mac_change(dp->pl, up);
2238 }
2239 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
2240
2241 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
2242                                           struct phylink_link_state *state)
2243 {
2244         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
2245         struct dsa_switch *ds = dp->ds;
2246
2247         /* No need to check that this operation is valid, the callback would
2248          * not be called if it was not.
2249          */
2250         ds->ops->phylink_fixed_state(ds, dp->index, state);
2251 }
2252
2253 /* slave device setup *******************************************************/
2254 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr,
2255                                  u32 flags)
2256 {
2257         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2258         struct dsa_switch *ds = dp->ds;
2259
2260         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
2261         if (!slave_dev->phydev) {
2262                 netdev_err(slave_dev, "no phy at %d\n", addr);
2263                 return -ENODEV;
2264         }
2265
2266         slave_dev->phydev->dev_flags |= flags;
2267
2268         return phylink_connect_phy(dp->pl, slave_dev->phydev);
2269 }
2270
2271 static int dsa_slave_phy_setup(struct net_device *slave_dev)
2272 {
2273         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2274         struct device_node *port_dn = dp->dn;
2275         struct dsa_switch *ds = dp->ds;
2276         u32 phy_flags = 0;
2277         int ret;
2278
2279         dp->pl_config.dev = &slave_dev->dev;
2280         dp->pl_config.type = PHYLINK_NETDEV;
2281
2282         /* The get_fixed_state callback takes precedence over polling the
2283          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
2284          * this if the switch provides such a callback.
2285          */
2286         if (ds->ops->phylink_fixed_state) {
2287                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
2288                 dp->pl_config.poll_fixed_state = true;
2289         }
2290
2291         ret = dsa_port_phylink_create(dp);
2292         if (ret)
2293                 return ret;
2294
2295         if (ds->ops->get_phy_flags)
2296                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
2297
2298         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
2299         if (ret == -ENODEV && ds->slave_mii_bus) {
2300                 /* We could not connect to a designated PHY or SFP, so try to
2301                  * use the switch internal MDIO bus instead
2302                  */
2303                 ret = dsa_slave_phy_connect(slave_dev, dp->index, phy_flags);
2304         }
2305         if (ret) {
2306                 netdev_err(slave_dev, "failed to connect to PHY: %pe\n",
2307                            ERR_PTR(ret));
2308                 dsa_port_phylink_destroy(dp);
2309         }
2310
2311         return ret;
2312 }
2313
2314 void dsa_slave_setup_tagger(struct net_device *slave)
2315 {
2316         struct dsa_port *dp = dsa_slave_to_port(slave);
2317         struct net_device *master = dsa_port_to_master(dp);
2318         struct dsa_slave_priv *p = netdev_priv(slave);
2319         const struct dsa_port *cpu_dp = dp->cpu_dp;
2320         const struct dsa_switch *ds = dp->ds;
2321
2322         slave->needed_headroom = cpu_dp->tag_ops->needed_headroom;
2323         slave->needed_tailroom = cpu_dp->tag_ops->needed_tailroom;
2324         /* Try to save one extra realloc later in the TX path (in the master)
2325          * by also inheriting the master's needed headroom and tailroom.
2326          * The 8021q driver also does this.
2327          */
2328         slave->needed_headroom += master->needed_headroom;
2329         slave->needed_tailroom += master->needed_tailroom;
2330
2331         p->xmit = cpu_dp->tag_ops->xmit;
2332
2333         slave->features = master->vlan_features | NETIF_F_HW_TC;
2334         slave->hw_features |= NETIF_F_HW_TC;
2335         slave->features |= NETIF_F_LLTX;
2336         if (slave->needed_tailroom)
2337                 slave->features &= ~(NETIF_F_SG | NETIF_F_FRAGLIST);
2338         if (ds->needs_standalone_vlan_filtering)
2339                 slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2340 }
2341
2342 int dsa_slave_suspend(struct net_device *slave_dev)
2343 {
2344         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2345
2346         if (!netif_running(slave_dev))
2347                 return 0;
2348
2349         netif_device_detach(slave_dev);
2350
2351         rtnl_lock();
2352         phylink_stop(dp->pl);
2353         rtnl_unlock();
2354
2355         return 0;
2356 }
2357
2358 int dsa_slave_resume(struct net_device *slave_dev)
2359 {
2360         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2361
2362         if (!netif_running(slave_dev))
2363                 return 0;
2364
2365         netif_device_attach(slave_dev);
2366
2367         rtnl_lock();
2368         phylink_start(dp->pl);
2369         rtnl_unlock();
2370
2371         return 0;
2372 }
2373
2374 int dsa_slave_create(struct dsa_port *port)
2375 {
2376         struct net_device *master = dsa_port_to_master(port);
2377         struct dsa_switch *ds = port->ds;
2378         const char *name = port->name;
2379         struct net_device *slave_dev;
2380         struct dsa_slave_priv *p;
2381         int ret;
2382
2383         if (!ds->num_tx_queues)
2384                 ds->num_tx_queues = 1;
2385
2386         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
2387                                      NET_NAME_UNKNOWN, ether_setup,
2388                                      ds->num_tx_queues, 1);
2389         if (slave_dev == NULL)
2390                 return -ENOMEM;
2391
2392         slave_dev->rtnl_link_ops = &dsa_link_ops;
2393         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
2394 #if IS_ENABLED(CONFIG_DCB)
2395         slave_dev->dcbnl_ops = &dsa_slave_dcbnl_ops;
2396 #endif
2397         if (!is_zero_ether_addr(port->mac))
2398                 eth_hw_addr_set(slave_dev, port->mac);
2399         else
2400                 eth_hw_addr_inherit(slave_dev, master);
2401         slave_dev->priv_flags |= IFF_NO_QUEUE;
2402         if (dsa_switch_supports_uc_filtering(ds))
2403                 slave_dev->priv_flags |= IFF_UNICAST_FLT;
2404         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
2405         if (ds->ops->port_max_mtu)
2406                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
2407         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
2408
2409         SET_NETDEV_DEV(slave_dev, port->ds->dev);
2410         slave_dev->dev.of_node = port->dn;
2411         slave_dev->vlan_features = master->vlan_features;
2412
2413         p = netdev_priv(slave_dev);
2414         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2415         if (!slave_dev->tstats) {
2416                 free_netdev(slave_dev);
2417                 return -ENOMEM;
2418         }
2419
2420         ret = gro_cells_init(&p->gcells, slave_dev);
2421         if (ret)
2422                 goto out_free;
2423
2424         p->dp = port;
2425         INIT_LIST_HEAD(&p->mall_tc_list);
2426         port->slave = slave_dev;
2427         dsa_slave_setup_tagger(slave_dev);
2428
2429         netif_carrier_off(slave_dev);
2430
2431         ret = dsa_slave_phy_setup(slave_dev);
2432         if (ret) {
2433                 netdev_err(slave_dev,
2434                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
2435                            ret, ds->dst->index, ds->index, port->index);
2436                 goto out_gcells;
2437         }
2438
2439         rtnl_lock();
2440
2441         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
2442         if (ret && ret != -EOPNOTSUPP)
2443                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
2444                          ret, ETH_DATA_LEN, port->index);
2445
2446         ret = register_netdevice(slave_dev);
2447         if (ret) {
2448                 netdev_err(master, "error %d registering interface %s\n",
2449                            ret, slave_dev->name);
2450                 rtnl_unlock();
2451                 goto out_phy;
2452         }
2453
2454         if (IS_ENABLED(CONFIG_DCB)) {
2455                 ret = dsa_slave_dcbnl_init(slave_dev);
2456                 if (ret) {
2457                         netdev_err(slave_dev,
2458                                    "failed to initialize DCB: %pe\n",
2459                                    ERR_PTR(ret));
2460                         rtnl_unlock();
2461                         goto out_unregister;
2462                 }
2463         }
2464
2465         ret = netdev_upper_dev_link(master, slave_dev, NULL);
2466
2467         rtnl_unlock();
2468
2469         if (ret)
2470                 goto out_unregister;
2471
2472         return 0;
2473
2474 out_unregister:
2475         unregister_netdev(slave_dev);
2476 out_phy:
2477         rtnl_lock();
2478         phylink_disconnect_phy(p->dp->pl);
2479         rtnl_unlock();
2480         dsa_port_phylink_destroy(p->dp);
2481 out_gcells:
2482         gro_cells_destroy(&p->gcells);
2483 out_free:
2484         free_percpu(slave_dev->tstats);
2485         free_netdev(slave_dev);
2486         port->slave = NULL;
2487         return ret;
2488 }
2489
2490 void dsa_slave_destroy(struct net_device *slave_dev)
2491 {
2492         struct net_device *master = dsa_slave_to_master(slave_dev);
2493         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2494         struct dsa_slave_priv *p = netdev_priv(slave_dev);
2495
2496         netif_carrier_off(slave_dev);
2497         rtnl_lock();
2498         netdev_upper_dev_unlink(master, slave_dev);
2499         unregister_netdevice(slave_dev);
2500         phylink_disconnect_phy(dp->pl);
2501         rtnl_unlock();
2502
2503         dsa_port_phylink_destroy(dp);
2504         gro_cells_destroy(&p->gcells);
2505         free_percpu(slave_dev->tstats);
2506         free_netdev(slave_dev);
2507 }
2508
2509 int dsa_slave_change_master(struct net_device *dev, struct net_device *master,
2510                             struct netlink_ext_ack *extack)
2511 {
2512         struct net_device *old_master = dsa_slave_to_master(dev);
2513         struct dsa_port *dp = dsa_slave_to_port(dev);
2514         struct dsa_switch *ds = dp->ds;
2515         struct net_device *upper;
2516         struct list_head *iter;
2517         int err;
2518
2519         if (master == old_master)
2520                 return 0;
2521
2522         if (!ds->ops->port_change_master) {
2523                 NL_SET_ERR_MSG_MOD(extack,
2524                                    "Driver does not support changing DSA master");
2525                 return -EOPNOTSUPP;
2526         }
2527
2528         if (!netdev_uses_dsa(master)) {
2529                 NL_SET_ERR_MSG_MOD(extack,
2530                                    "Interface not eligible as DSA master");
2531                 return -EOPNOTSUPP;
2532         }
2533
2534         netdev_for_each_upper_dev_rcu(master, upper, iter) {
2535                 if (dsa_slave_dev_check(upper))
2536                         continue;
2537                 if (netif_is_bridge_master(upper))
2538                         continue;
2539                 NL_SET_ERR_MSG_MOD(extack, "Cannot join master with unknown uppers");
2540                 return -EOPNOTSUPP;
2541         }
2542
2543         /* Since we allow live-changing the DSA master, plus we auto-open the
2544          * DSA master when the user port opens => we need to ensure that the
2545          * new DSA master is open too.
2546          */
2547         if (dev->flags & IFF_UP) {
2548                 err = dev_open(master, extack);
2549                 if (err)
2550                         return err;
2551         }
2552
2553         netdev_upper_dev_unlink(old_master, dev);
2554
2555         err = netdev_upper_dev_link(master, dev, extack);
2556         if (err)
2557                 goto out_revert_old_master_unlink;
2558
2559         err = dsa_port_change_master(dp, master, extack);
2560         if (err)
2561                 goto out_revert_master_link;
2562
2563         /* Update the MTU of the new CPU port through cross-chip notifiers */
2564         err = dsa_slave_change_mtu(dev, dev->mtu);
2565         if (err && err != -EOPNOTSUPP) {
2566                 netdev_warn(dev,
2567                             "nonfatal error updating MTU with new master: %pe\n",
2568                             ERR_PTR(err));
2569         }
2570
2571         /* If the port doesn't have its own MAC address and relies on the DSA
2572          * master's one, inherit it again from the new DSA master.
2573          */
2574         if (is_zero_ether_addr(dp->mac))
2575                 eth_hw_addr_inherit(dev, master);
2576
2577         return 0;
2578
2579 out_revert_master_link:
2580         netdev_upper_dev_unlink(master, dev);
2581 out_revert_old_master_unlink:
2582         netdev_upper_dev_link(old_master, dev, NULL);
2583         return err;
2584 }
2585
2586 bool dsa_slave_dev_check(const struct net_device *dev)
2587 {
2588         return dev->netdev_ops == &dsa_slave_netdev_ops;
2589 }
2590 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
2591
2592 static int dsa_slave_changeupper(struct net_device *dev,
2593                                  struct netdev_notifier_changeupper_info *info)
2594 {
2595         struct dsa_port *dp = dsa_slave_to_port(dev);
2596         struct netlink_ext_ack *extack;
2597         int err = NOTIFY_DONE;
2598
2599         if (!dsa_slave_dev_check(dev))
2600                 return err;
2601
2602         extack = netdev_notifier_info_to_extack(&info->info);
2603
2604         if (netif_is_bridge_master(info->upper_dev)) {
2605                 if (info->linking) {
2606                         err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2607                         if (!err)
2608                                 dsa_bridge_mtu_normalization(dp);
2609                         if (err == -EOPNOTSUPP) {
2610                                 if (extack && !extack->_msg)
2611                                         NL_SET_ERR_MSG_MOD(extack,
2612                                                            "Offloading not supported");
2613                                 err = 0;
2614                         }
2615                         err = notifier_from_errno(err);
2616                 } else {
2617                         dsa_port_bridge_leave(dp, info->upper_dev);
2618                         err = NOTIFY_OK;
2619                 }
2620         } else if (netif_is_lag_master(info->upper_dev)) {
2621                 if (info->linking) {
2622                         err = dsa_port_lag_join(dp, info->upper_dev,
2623                                                 info->upper_info, extack);
2624                         if (err == -EOPNOTSUPP) {
2625                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2626                                                    "Offloading not supported");
2627                                 err = 0;
2628                         }
2629                         err = notifier_from_errno(err);
2630                 } else {
2631                         dsa_port_lag_leave(dp, info->upper_dev);
2632                         err = NOTIFY_OK;
2633                 }
2634         } else if (is_hsr_master(info->upper_dev)) {
2635                 if (info->linking) {
2636                         err = dsa_port_hsr_join(dp, info->upper_dev);
2637                         if (err == -EOPNOTSUPP) {
2638                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2639                                                    "Offloading not supported");
2640                                 err = 0;
2641                         }
2642                         err = notifier_from_errno(err);
2643                 } else {
2644                         dsa_port_hsr_leave(dp, info->upper_dev);
2645                         err = NOTIFY_OK;
2646                 }
2647         }
2648
2649         return err;
2650 }
2651
2652 static int dsa_slave_prechangeupper(struct net_device *dev,
2653                                     struct netdev_notifier_changeupper_info *info)
2654 {
2655         struct dsa_port *dp = dsa_slave_to_port(dev);
2656
2657         if (!dsa_slave_dev_check(dev))
2658                 return NOTIFY_DONE;
2659
2660         if (netif_is_bridge_master(info->upper_dev) && !info->linking)
2661                 dsa_port_pre_bridge_leave(dp, info->upper_dev);
2662         else if (netif_is_lag_master(info->upper_dev) && !info->linking)
2663                 dsa_port_pre_lag_leave(dp, info->upper_dev);
2664         /* dsa_port_pre_hsr_leave is not yet necessary since hsr cannot be
2665          * meaningfully enslaved to a bridge yet
2666          */
2667
2668         return NOTIFY_DONE;
2669 }
2670
2671 static int
2672 dsa_slave_lag_changeupper(struct net_device *dev,
2673                           struct netdev_notifier_changeupper_info *info)
2674 {
2675         struct net_device *lower;
2676         struct list_head *iter;
2677         int err = NOTIFY_DONE;
2678         struct dsa_port *dp;
2679
2680         if (!netif_is_lag_master(dev))
2681                 return err;
2682
2683         netdev_for_each_lower_dev(dev, lower, iter) {
2684                 if (!dsa_slave_dev_check(lower))
2685                         continue;
2686
2687                 dp = dsa_slave_to_port(lower);
2688                 if (!dp->lag)
2689                         /* Software LAG */
2690                         continue;
2691
2692                 err = dsa_slave_changeupper(lower, info);
2693                 if (notifier_to_errno(err))
2694                         break;
2695         }
2696
2697         return err;
2698 }
2699
2700 /* Same as dsa_slave_lag_changeupper() except that it calls
2701  * dsa_slave_prechangeupper()
2702  */
2703 static int
2704 dsa_slave_lag_prechangeupper(struct net_device *dev,
2705                              struct netdev_notifier_changeupper_info *info)
2706 {
2707         struct net_device *lower;
2708         struct list_head *iter;
2709         int err = NOTIFY_DONE;
2710         struct dsa_port *dp;
2711
2712         if (!netif_is_lag_master(dev))
2713                 return err;
2714
2715         netdev_for_each_lower_dev(dev, lower, iter) {
2716                 if (!dsa_slave_dev_check(lower))
2717                         continue;
2718
2719                 dp = dsa_slave_to_port(lower);
2720                 if (!dp->lag)
2721                         /* Software LAG */
2722                         continue;
2723
2724                 err = dsa_slave_prechangeupper(lower, info);
2725                 if (notifier_to_errno(err))
2726                         break;
2727         }
2728
2729         return err;
2730 }
2731
2732 static int
2733 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2734                                  struct netdev_notifier_changeupper_info *info)
2735 {
2736         struct netlink_ext_ack *ext_ack;
2737         struct net_device *slave, *br;
2738         struct dsa_port *dp;
2739
2740         ext_ack = netdev_notifier_info_to_extack(&info->info);
2741
2742         if (!is_vlan_dev(dev))
2743                 return NOTIFY_DONE;
2744
2745         slave = vlan_dev_real_dev(dev);
2746         if (!dsa_slave_dev_check(slave))
2747                 return NOTIFY_DONE;
2748
2749         dp = dsa_slave_to_port(slave);
2750         br = dsa_port_bridge_dev_get(dp);
2751         if (!br)
2752                 return NOTIFY_DONE;
2753
2754         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2755         if (br_vlan_enabled(br) &&
2756             netif_is_bridge_master(info->upper_dev) && info->linking) {
2757                 NL_SET_ERR_MSG_MOD(ext_ack,
2758                                    "Cannot enslave VLAN device into VLAN aware bridge");
2759                 return notifier_from_errno(-EINVAL);
2760         }
2761
2762         return NOTIFY_DONE;
2763 }
2764
2765 static int
2766 dsa_slave_check_8021q_upper(struct net_device *dev,
2767                             struct netdev_notifier_changeupper_info *info)
2768 {
2769         struct dsa_port *dp = dsa_slave_to_port(dev);
2770         struct net_device *br = dsa_port_bridge_dev_get(dp);
2771         struct bridge_vlan_info br_info;
2772         struct netlink_ext_ack *extack;
2773         int err = NOTIFY_DONE;
2774         u16 vid;
2775
2776         if (!br || !br_vlan_enabled(br))
2777                 return NOTIFY_DONE;
2778
2779         extack = netdev_notifier_info_to_extack(&info->info);
2780         vid = vlan_dev_vlan_id(info->upper_dev);
2781
2782         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2783          * device, respectively the VID is not found, returning
2784          * 0 means success, which is a failure for us here.
2785          */
2786         err = br_vlan_get_info(br, vid, &br_info);
2787         if (err == 0) {
2788                 NL_SET_ERR_MSG_MOD(extack,
2789                                    "This VLAN is already configured by the bridge");
2790                 return notifier_from_errno(-EBUSY);
2791         }
2792
2793         return NOTIFY_DONE;
2794 }
2795
2796 static int
2797 dsa_slave_prechangeupper_sanity_check(struct net_device *dev,
2798                                       struct netdev_notifier_changeupper_info *info)
2799 {
2800         struct dsa_switch *ds;
2801         struct dsa_port *dp;
2802         int err;
2803
2804         if (!dsa_slave_dev_check(dev))
2805                 return dsa_prevent_bridging_8021q_upper(dev, info);
2806
2807         dp = dsa_slave_to_port(dev);
2808         ds = dp->ds;
2809
2810         if (ds->ops->port_prechangeupper) {
2811                 err = ds->ops->port_prechangeupper(ds, dp->index, info);
2812                 if (err)
2813                         return notifier_from_errno(err);
2814         }
2815
2816         if (is_vlan_dev(info->upper_dev))
2817                 return dsa_slave_check_8021q_upper(dev, info);
2818
2819         return NOTIFY_DONE;
2820 }
2821
2822 /* To be eligible as a DSA master, a LAG must have all lower interfaces be
2823  * eligible DSA masters. Additionally, all LAG slaves must be DSA masters of
2824  * switches in the same switch tree.
2825  */
2826 static int dsa_lag_master_validate(struct net_device *lag_dev,
2827                                    struct netlink_ext_ack *extack)
2828 {
2829         struct net_device *lower1, *lower2;
2830         struct list_head *iter1, *iter2;
2831
2832         netdev_for_each_lower_dev(lag_dev, lower1, iter1) {
2833                 netdev_for_each_lower_dev(lag_dev, lower2, iter2) {
2834                         if (!netdev_uses_dsa(lower1) ||
2835                             !netdev_uses_dsa(lower2)) {
2836                                 NL_SET_ERR_MSG_MOD(extack,
2837                                                    "All LAG ports must be eligible as DSA masters");
2838                                 return notifier_from_errno(-EINVAL);
2839                         }
2840
2841                         if (lower1 == lower2)
2842                                 continue;
2843
2844                         if (!dsa_port_tree_same(lower1->dsa_ptr,
2845                                                 lower2->dsa_ptr)) {
2846                                 NL_SET_ERR_MSG_MOD(extack,
2847                                                    "LAG contains DSA masters of disjoint switch trees");
2848                                 return notifier_from_errno(-EINVAL);
2849                         }
2850                 }
2851         }
2852
2853         return NOTIFY_DONE;
2854 }
2855
2856 static int
2857 dsa_master_prechangeupper_sanity_check(struct net_device *master,
2858                                        struct netdev_notifier_changeupper_info *info)
2859 {
2860         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(&info->info);
2861
2862         if (!netdev_uses_dsa(master))
2863                 return NOTIFY_DONE;
2864
2865         if (!info->linking)
2866                 return NOTIFY_DONE;
2867
2868         /* Allow DSA switch uppers */
2869         if (dsa_slave_dev_check(info->upper_dev))
2870                 return NOTIFY_DONE;
2871
2872         /* Allow bridge uppers of DSA masters, subject to further
2873          * restrictions in dsa_bridge_prechangelower_sanity_check()
2874          */
2875         if (netif_is_bridge_master(info->upper_dev))
2876                 return NOTIFY_DONE;
2877
2878         /* Allow LAG uppers, subject to further restrictions in
2879          * dsa_lag_master_prechangelower_sanity_check()
2880          */
2881         if (netif_is_lag_master(info->upper_dev))
2882                 return dsa_lag_master_validate(info->upper_dev, extack);
2883
2884         NL_SET_ERR_MSG_MOD(extack,
2885                            "DSA master cannot join unknown upper interfaces");
2886         return notifier_from_errno(-EBUSY);
2887 }
2888
2889 static int
2890 dsa_lag_master_prechangelower_sanity_check(struct net_device *dev,
2891                                            struct netdev_notifier_changeupper_info *info)
2892 {
2893         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(&info->info);
2894         struct net_device *lag_dev = info->upper_dev;
2895         struct net_device *lower;
2896         struct list_head *iter;
2897
2898         if (!netdev_uses_dsa(lag_dev) || !netif_is_lag_master(lag_dev))
2899                 return NOTIFY_DONE;
2900
2901         if (!info->linking)
2902                 return NOTIFY_DONE;
2903
2904         if (!netdev_uses_dsa(dev)) {
2905                 NL_SET_ERR_MSG(extack,
2906                                "Only DSA masters can join a LAG DSA master");
2907                 return notifier_from_errno(-EINVAL);
2908         }
2909
2910         netdev_for_each_lower_dev(lag_dev, lower, iter) {
2911                 if (!dsa_port_tree_same(dev->dsa_ptr, lower->dsa_ptr)) {
2912                         NL_SET_ERR_MSG(extack,
2913                                        "Interface is DSA master for a different switch tree than this LAG");
2914                         return notifier_from_errno(-EINVAL);
2915                 }
2916
2917                 break;
2918         }
2919
2920         return NOTIFY_DONE;
2921 }
2922
2923 /* Don't allow bridging of DSA masters, since the bridge layer rx_handler
2924  * prevents the DSA fake ethertype handler to be invoked, so we don't get the
2925  * chance to strip off and parse the DSA switch tag protocol header (the bridge
2926  * layer just returns RX_HANDLER_CONSUMED, stopping RX processing for these
2927  * frames).
2928  * The only case where that would not be an issue is when bridging can already
2929  * be offloaded, such as when the DSA master is itself a DSA or plain switchdev
2930  * port, and is bridged only with other ports from the same hardware device.
2931  */
2932 static int
2933 dsa_bridge_prechangelower_sanity_check(struct net_device *new_lower,
2934                                        struct netdev_notifier_changeupper_info *info)
2935 {
2936         struct net_device *br = info->upper_dev;
2937         struct netlink_ext_ack *extack;
2938         struct net_device *lower;
2939         struct list_head *iter;
2940
2941         if (!netif_is_bridge_master(br))
2942                 return NOTIFY_DONE;
2943
2944         if (!info->linking)
2945                 return NOTIFY_DONE;
2946
2947         extack = netdev_notifier_info_to_extack(&info->info);
2948
2949         netdev_for_each_lower_dev(br, lower, iter) {
2950                 if (!netdev_uses_dsa(new_lower) && !netdev_uses_dsa(lower))
2951                         continue;
2952
2953                 if (!netdev_port_same_parent_id(lower, new_lower)) {
2954                         NL_SET_ERR_MSG(extack,
2955                                        "Cannot do software bridging with a DSA master");
2956                         return notifier_from_errno(-EINVAL);
2957                 }
2958         }
2959
2960         return NOTIFY_DONE;
2961 }
2962
2963 static void dsa_tree_migrate_ports_from_lag_master(struct dsa_switch_tree *dst,
2964                                                    struct net_device *lag_dev)
2965 {
2966         struct net_device *new_master = dsa_tree_find_first_master(dst);
2967         struct dsa_port *dp;
2968         int err;
2969
2970         dsa_tree_for_each_user_port(dp, dst) {
2971                 if (dsa_port_to_master(dp) != lag_dev)
2972                         continue;
2973
2974                 err = dsa_slave_change_master(dp->slave, new_master, NULL);
2975                 if (err) {
2976                         netdev_err(dp->slave,
2977                                    "failed to restore master to %s: %pe\n",
2978                                    new_master->name, ERR_PTR(err));
2979                 }
2980         }
2981 }
2982
2983 static int dsa_master_lag_join(struct net_device *master,
2984                                struct net_device *lag_dev,
2985                                struct netdev_lag_upper_info *uinfo,
2986                                struct netlink_ext_ack *extack)
2987 {
2988         struct dsa_port *cpu_dp = master->dsa_ptr;
2989         struct dsa_switch_tree *dst = cpu_dp->dst;
2990         struct dsa_port *dp;
2991         int err;
2992
2993         err = dsa_master_lag_setup(lag_dev, cpu_dp, uinfo, extack);
2994         if (err)
2995                 return err;
2996
2997         dsa_tree_for_each_user_port(dp, dst) {
2998                 if (dsa_port_to_master(dp) != master)
2999                         continue;
3000
3001                 err = dsa_slave_change_master(dp->slave, lag_dev, extack);
3002                 if (err)
3003                         goto restore;
3004         }
3005
3006         return 0;
3007
3008 restore:
3009         dsa_tree_for_each_user_port_continue_reverse(dp, dst) {
3010                 if (dsa_port_to_master(dp) != lag_dev)
3011                         continue;
3012
3013                 err = dsa_slave_change_master(dp->slave, master, NULL);
3014                 if (err) {
3015                         netdev_err(dp->slave,
3016                                    "failed to restore master to %s: %pe\n",
3017                                    master->name, ERR_PTR(err));
3018                 }
3019         }
3020
3021         dsa_master_lag_teardown(lag_dev, master->dsa_ptr);
3022
3023         return err;
3024 }
3025
3026 static void dsa_master_lag_leave(struct net_device *master,
3027                                  struct net_device *lag_dev)
3028 {
3029         struct dsa_port *dp, *cpu_dp = lag_dev->dsa_ptr;
3030         struct dsa_switch_tree *dst = cpu_dp->dst;
3031         struct dsa_port *new_cpu_dp = NULL;
3032         struct net_device *lower;
3033         struct list_head *iter;
3034
3035         netdev_for_each_lower_dev(lag_dev, lower, iter) {
3036                 if (netdev_uses_dsa(lower)) {
3037                         new_cpu_dp = lower->dsa_ptr;
3038                         break;
3039                 }
3040         }
3041
3042         if (new_cpu_dp) {
3043                 /* Update the CPU port of the user ports still under the LAG
3044                  * so that dsa_port_to_master() continues to work properly
3045                  */
3046                 dsa_tree_for_each_user_port(dp, dst)
3047                         if (dsa_port_to_master(dp) == lag_dev)
3048                                 dp->cpu_dp = new_cpu_dp;
3049
3050                 /* Update the index of the virtual CPU port to match the lowest
3051                  * physical CPU port
3052                  */
3053                 lag_dev->dsa_ptr = new_cpu_dp;
3054                 wmb();
3055         } else {
3056                 /* If the LAG DSA master has no ports left, migrate back all
3057                  * user ports to the first physical CPU port
3058                  */
3059                 dsa_tree_migrate_ports_from_lag_master(dst, lag_dev);
3060         }
3061
3062         /* This DSA master has left its LAG in any case, so let
3063          * the CPU port leave the hardware LAG as well
3064          */
3065         dsa_master_lag_teardown(lag_dev, master->dsa_ptr);
3066 }
3067
3068 static int dsa_master_changeupper(struct net_device *dev,
3069                                   struct netdev_notifier_changeupper_info *info)
3070 {
3071         struct netlink_ext_ack *extack;
3072         int err = NOTIFY_DONE;
3073
3074         if (!netdev_uses_dsa(dev))
3075                 return err;
3076
3077         extack = netdev_notifier_info_to_extack(&info->info);
3078
3079         if (netif_is_lag_master(info->upper_dev)) {
3080                 if (info->linking) {
3081                         err = dsa_master_lag_join(dev, info->upper_dev,
3082                                                   info->upper_info, extack);
3083                         err = notifier_from_errno(err);
3084                 } else {
3085                         dsa_master_lag_leave(dev, info->upper_dev);
3086                         err = NOTIFY_OK;
3087                 }
3088         }
3089
3090         return err;
3091 }
3092
3093 static int dsa_slave_netdevice_event(struct notifier_block *nb,
3094                                      unsigned long event, void *ptr)
3095 {
3096         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3097
3098         switch (event) {
3099         case NETDEV_PRECHANGEUPPER: {
3100                 struct netdev_notifier_changeupper_info *info = ptr;
3101                 int err;
3102
3103                 err = dsa_slave_prechangeupper_sanity_check(dev, info);
3104                 if (notifier_to_errno(err))
3105                         return err;
3106
3107                 err = dsa_master_prechangeupper_sanity_check(dev, info);
3108                 if (notifier_to_errno(err))
3109                         return err;
3110
3111                 err = dsa_lag_master_prechangelower_sanity_check(dev, info);
3112                 if (notifier_to_errno(err))
3113                         return err;
3114
3115                 err = dsa_bridge_prechangelower_sanity_check(dev, info);
3116                 if (notifier_to_errno(err))
3117                         return err;
3118
3119                 err = dsa_slave_prechangeupper(dev, ptr);
3120                 if (notifier_to_errno(err))
3121                         return err;
3122
3123                 err = dsa_slave_lag_prechangeupper(dev, ptr);
3124                 if (notifier_to_errno(err))
3125                         return err;
3126
3127                 break;
3128         }
3129         case NETDEV_CHANGEUPPER: {
3130                 int err;
3131
3132                 err = dsa_slave_changeupper(dev, ptr);
3133                 if (notifier_to_errno(err))
3134                         return err;
3135
3136                 err = dsa_slave_lag_changeupper(dev, ptr);
3137                 if (notifier_to_errno(err))
3138                         return err;
3139
3140                 err = dsa_master_changeupper(dev, ptr);
3141                 if (notifier_to_errno(err))
3142                         return err;
3143
3144                 break;
3145         }
3146         case NETDEV_CHANGELOWERSTATE: {
3147                 struct netdev_notifier_changelowerstate_info *info = ptr;
3148                 struct dsa_port *dp;
3149                 int err = 0;
3150
3151                 if (dsa_slave_dev_check(dev)) {
3152                         dp = dsa_slave_to_port(dev);
3153
3154                         err = dsa_port_lag_change(dp, info->lower_state_info);
3155                 }
3156
3157                 /* Mirror LAG port events on DSA masters that are in
3158                  * a LAG towards their respective switch CPU ports
3159                  */
3160                 if (netdev_uses_dsa(dev)) {
3161                         dp = dev->dsa_ptr;
3162
3163                         err = dsa_port_lag_change(dp, info->lower_state_info);
3164                 }
3165
3166                 return notifier_from_errno(err);
3167         }
3168         case NETDEV_CHANGE:
3169         case NETDEV_UP: {
3170                 /* Track state of master port.
3171                  * DSA driver may require the master port (and indirectly
3172                  * the tagger) to be available for some special operation.
3173                  */
3174                 if (netdev_uses_dsa(dev)) {
3175                         struct dsa_port *cpu_dp = dev->dsa_ptr;
3176                         struct dsa_switch_tree *dst = cpu_dp->ds->dst;
3177
3178                         /* Track when the master port is UP */
3179                         dsa_tree_master_oper_state_change(dst, dev,
3180                                                           netif_oper_up(dev));
3181
3182                         /* Track when the master port is ready and can accept
3183                          * packet.
3184                          * NETDEV_UP event is not enough to flag a port as ready.
3185                          * We also have to wait for linkwatch_do_dev to dev_activate
3186                          * and emit a NETDEV_CHANGE event.
3187                          * We check if a master port is ready by checking if the dev
3188                          * have a qdisc assigned and is not noop.
3189                          */
3190                         dsa_tree_master_admin_state_change(dst, dev,
3191                                                            !qdisc_tx_is_noop(dev));
3192
3193                         return NOTIFY_OK;
3194                 }
3195
3196                 return NOTIFY_DONE;
3197         }
3198         case NETDEV_GOING_DOWN: {
3199                 struct dsa_port *dp, *cpu_dp;
3200                 struct dsa_switch_tree *dst;
3201                 LIST_HEAD(close_list);
3202
3203                 if (!netdev_uses_dsa(dev))
3204                         return NOTIFY_DONE;
3205
3206                 cpu_dp = dev->dsa_ptr;
3207                 dst = cpu_dp->ds->dst;
3208
3209                 dsa_tree_master_admin_state_change(dst, dev, false);
3210
3211                 list_for_each_entry(dp, &dst->ports, list) {
3212                         if (!dsa_port_is_user(dp))
3213                                 continue;
3214
3215                         if (dp->cpu_dp != cpu_dp)
3216                                 continue;
3217
3218                         list_add(&dp->slave->close_list, &close_list);
3219                 }
3220
3221                 dev_close_many(&close_list, true);
3222
3223                 return NOTIFY_OK;
3224         }
3225         default:
3226                 break;
3227         }
3228
3229         return NOTIFY_DONE;
3230 }
3231
3232 static void
3233 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
3234 {
3235         struct switchdev_notifier_fdb_info info = {};
3236
3237         info.addr = switchdev_work->addr;
3238         info.vid = switchdev_work->vid;
3239         info.offloaded = true;
3240         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
3241                                  switchdev_work->orig_dev, &info.info, NULL);
3242 }
3243
3244 static void dsa_slave_switchdev_event_work(struct work_struct *work)
3245 {
3246         struct dsa_switchdev_event_work *switchdev_work =
3247                 container_of(work, struct dsa_switchdev_event_work, work);
3248         const unsigned char *addr = switchdev_work->addr;
3249         struct net_device *dev = switchdev_work->dev;
3250         u16 vid = switchdev_work->vid;
3251         struct dsa_switch *ds;
3252         struct dsa_port *dp;
3253         int err;
3254
3255         dp = dsa_slave_to_port(dev);
3256         ds = dp->ds;
3257
3258         switch (switchdev_work->event) {
3259         case SWITCHDEV_FDB_ADD_TO_DEVICE:
3260                 if (switchdev_work->host_addr)
3261                         err = dsa_port_bridge_host_fdb_add(dp, addr, vid);
3262                 else if (dp->lag)
3263                         err = dsa_port_lag_fdb_add(dp, addr, vid);
3264                 else
3265                         err = dsa_port_fdb_add(dp, addr, vid);
3266                 if (err) {
3267                         dev_err(ds->dev,
3268                                 "port %d failed to add %pM vid %d to fdb: %d\n",
3269                                 dp->index, addr, vid, err);
3270                         break;
3271                 }
3272                 dsa_fdb_offload_notify(switchdev_work);
3273                 break;
3274
3275         case SWITCHDEV_FDB_DEL_TO_DEVICE:
3276                 if (switchdev_work->host_addr)
3277                         err = dsa_port_bridge_host_fdb_del(dp, addr, vid);
3278                 else if (dp->lag)
3279                         err = dsa_port_lag_fdb_del(dp, addr, vid);
3280                 else
3281                         err = dsa_port_fdb_del(dp, addr, vid);
3282                 if (err) {
3283                         dev_err(ds->dev,
3284                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
3285                                 dp->index, addr, vid, err);
3286                 }
3287
3288                 break;
3289         }
3290
3291         kfree(switchdev_work);
3292 }
3293
3294 static bool dsa_foreign_dev_check(const struct net_device *dev,
3295                                   const struct net_device *foreign_dev)
3296 {
3297         const struct dsa_port *dp = dsa_slave_to_port(dev);
3298         struct dsa_switch_tree *dst = dp->ds->dst;
3299
3300         if (netif_is_bridge_master(foreign_dev))
3301                 return !dsa_tree_offloads_bridge_dev(dst, foreign_dev);
3302
3303         if (netif_is_bridge_port(foreign_dev))
3304                 return !dsa_tree_offloads_bridge_port(dst, foreign_dev);
3305
3306         /* Everything else is foreign */
3307         return true;
3308 }
3309
3310 static int dsa_slave_fdb_event(struct net_device *dev,
3311                                struct net_device *orig_dev,
3312                                unsigned long event, const void *ctx,
3313                                const struct switchdev_notifier_fdb_info *fdb_info)
3314 {
3315         struct dsa_switchdev_event_work *switchdev_work;
3316         struct dsa_port *dp = dsa_slave_to_port(dev);
3317         bool host_addr = fdb_info->is_local;
3318         struct dsa_switch *ds = dp->ds;
3319
3320         if (ctx && ctx != dp)
3321                 return 0;
3322
3323         if (!dp->bridge)
3324                 return 0;
3325
3326         if (switchdev_fdb_is_dynamically_learned(fdb_info)) {
3327                 if (dsa_port_offloads_bridge_port(dp, orig_dev))
3328                         return 0;
3329
3330                 /* FDB entries learned by the software bridge or by foreign
3331                  * bridge ports should be installed as host addresses only if
3332                  * the driver requests assisted learning.
3333                  */
3334                 if (!ds->assisted_learning_on_cpu_port)
3335                         return 0;
3336         }
3337
3338         /* Also treat FDB entries on foreign interfaces bridged with us as host
3339          * addresses.
3340          */
3341         if (dsa_foreign_dev_check(dev, orig_dev))
3342                 host_addr = true;
3343
3344         /* Check early that we're not doing work in vain.
3345          * Host addresses on LAG ports still require regular FDB ops,
3346          * since the CPU port isn't in a LAG.
3347          */
3348         if (dp->lag && !host_addr) {
3349                 if (!ds->ops->lag_fdb_add || !ds->ops->lag_fdb_del)
3350                         return -EOPNOTSUPP;
3351         } else {
3352                 if (!ds->ops->port_fdb_add || !ds->ops->port_fdb_del)
3353                         return -EOPNOTSUPP;
3354         }
3355
3356         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
3357         if (!switchdev_work)
3358                 return -ENOMEM;
3359
3360         netdev_dbg(dev, "%s FDB entry towards %s, addr %pM vid %d%s\n",
3361                    event == SWITCHDEV_FDB_ADD_TO_DEVICE ? "Adding" : "Deleting",
3362                    orig_dev->name, fdb_info->addr, fdb_info->vid,
3363                    host_addr ? " as host address" : "");
3364
3365         INIT_WORK(&switchdev_work->work, dsa_slave_switchdev_event_work);
3366         switchdev_work->event = event;
3367         switchdev_work->dev = dev;
3368         switchdev_work->orig_dev = orig_dev;
3369
3370         ether_addr_copy(switchdev_work->addr, fdb_info->addr);
3371         switchdev_work->vid = fdb_info->vid;
3372         switchdev_work->host_addr = host_addr;
3373
3374         dsa_schedule_work(&switchdev_work->work);
3375
3376         return 0;
3377 }
3378
3379 /* Called under rcu_read_lock() */
3380 static int dsa_slave_switchdev_event(struct notifier_block *unused,
3381                                      unsigned long event, void *ptr)
3382 {
3383         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3384         int err;
3385
3386         switch (event) {
3387         case SWITCHDEV_PORT_ATTR_SET:
3388                 err = switchdev_handle_port_attr_set(dev, ptr,
3389                                                      dsa_slave_dev_check,
3390                                                      dsa_slave_port_attr_set);
3391                 return notifier_from_errno(err);
3392         case SWITCHDEV_FDB_ADD_TO_DEVICE:
3393         case SWITCHDEV_FDB_DEL_TO_DEVICE:
3394                 err = switchdev_handle_fdb_event_to_device(dev, event, ptr,
3395                                                            dsa_slave_dev_check,
3396                                                            dsa_foreign_dev_check,
3397                                                            dsa_slave_fdb_event);
3398                 return notifier_from_errno(err);
3399         default:
3400                 return NOTIFY_DONE;
3401         }
3402
3403         return NOTIFY_OK;
3404 }
3405
3406 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
3407                                               unsigned long event, void *ptr)
3408 {
3409         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3410         int err;
3411
3412         switch (event) {
3413         case SWITCHDEV_PORT_OBJ_ADD:
3414                 err = switchdev_handle_port_obj_add_foreign(dev, ptr,
3415                                                             dsa_slave_dev_check,
3416                                                             dsa_foreign_dev_check,
3417                                                             dsa_slave_port_obj_add);
3418                 return notifier_from_errno(err);
3419         case SWITCHDEV_PORT_OBJ_DEL:
3420                 err = switchdev_handle_port_obj_del_foreign(dev, ptr,
3421                                                             dsa_slave_dev_check,
3422                                                             dsa_foreign_dev_check,
3423                                                             dsa_slave_port_obj_del);
3424                 return notifier_from_errno(err);
3425         case SWITCHDEV_PORT_ATTR_SET:
3426                 err = switchdev_handle_port_attr_set(dev, ptr,
3427                                                      dsa_slave_dev_check,
3428                                                      dsa_slave_port_attr_set);
3429                 return notifier_from_errno(err);
3430         }
3431
3432         return NOTIFY_DONE;
3433 }
3434
3435 static struct notifier_block dsa_slave_nb __read_mostly = {
3436         .notifier_call  = dsa_slave_netdevice_event,
3437 };
3438
3439 struct notifier_block dsa_slave_switchdev_notifier = {
3440         .notifier_call = dsa_slave_switchdev_event,
3441 };
3442
3443 struct notifier_block dsa_slave_switchdev_blocking_notifier = {
3444         .notifier_call = dsa_slave_switchdev_blocking_event,
3445 };
3446
3447 int dsa_slave_register_notifier(void)
3448 {
3449         struct notifier_block *nb;
3450         int err;
3451
3452         err = register_netdevice_notifier(&dsa_slave_nb);
3453         if (err)
3454                 return err;
3455
3456         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
3457         if (err)
3458                 goto err_switchdev_nb;
3459
3460         nb = &dsa_slave_switchdev_blocking_notifier;
3461         err = register_switchdev_blocking_notifier(nb);
3462         if (err)
3463                 goto err_switchdev_blocking_nb;
3464
3465         return 0;
3466
3467 err_switchdev_blocking_nb:
3468         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
3469 err_switchdev_nb:
3470         unregister_netdevice_notifier(&dsa_slave_nb);
3471         return err;
3472 }
3473
3474 void dsa_slave_unregister_notifier(void)
3475 {
3476         struct notifier_block *nb;
3477         int err;
3478
3479         nb = &dsa_slave_switchdev_blocking_notifier;
3480         err = unregister_switchdev_blocking_notifier(nb);
3481         if (err)
3482                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
3483
3484         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
3485         if (err)
3486                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
3487
3488         err = unregister_netdevice_notifier(&dsa_slave_nb);
3489         if (err)
3490                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
3491 }