net/dsa/user.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/dsa/user.c - user 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 #include <linux/string.h>
  25
  26 #include "conduit.h"
  27 #include "dsa.h"
  28 #include "netlink.h"
  29 #include "port.h"
  30 #include "switch.h"
  31 #include "tag.h"
  32 #include "user.h"
  33
  34 struct dsa_switchdev_event_work {
  35         struct net_device *dev;
  36         struct net_device *orig_dev;
  37         struct work_struct work;
  38         unsigned long event;
  39         /* Specific for SWITCHDEV_FDB_ADD_TO_DEVICE and
  40          * SWITCHDEV_FDB_DEL_TO_DEVICE
  41          */
  42         unsigned char addr[ETH_ALEN];
  43         u16 vid;
  44         bool host_addr;
  45 };
  46
  47 enum dsa_standalone_event {
  48         DSA_UC_ADD,
  49         DSA_UC_DEL,
  50         DSA_MC_ADD,
  51         DSA_MC_DEL,
  52 };
  53
  54 struct dsa_standalone_event_work {
  55         struct work_struct work;
  56         struct net_device *dev;
  57         enum dsa_standalone_event event;
  58         unsigned char addr[ETH_ALEN];
  59         u16 vid;
  60 };
  61
  62 struct dsa_host_vlan_rx_filtering_ctx {
  63         struct net_device *dev;
  64         const unsigned char *addr;
  65         enum dsa_standalone_event event;
  66 };
  67
  68 static bool dsa_switch_supports_uc_filtering(struct dsa_switch *ds)
  69 {
  70         return ds->ops->port_fdb_add && ds->ops->port_fdb_del &&
  71                ds->fdb_isolation && !ds->vlan_filtering_is_global &&
  72                !ds->needs_standalone_vlan_filtering;
  73 }
  74
  75 static bool dsa_switch_supports_mc_filtering(struct dsa_switch *ds)
  76 {
  77         return ds->ops->port_mdb_add && ds->ops->port_mdb_del &&
  78                ds->fdb_isolation && !ds->vlan_filtering_is_global &&
  79                !ds->needs_standalone_vlan_filtering;
  80 }
  81
  82 static void dsa_user_standalone_event_work(struct work_struct *work)
  83 {
  84         struct dsa_standalone_event_work *standalone_work =
  85                 container_of(work, struct dsa_standalone_event_work, work);
  86         const unsigned char *addr = standalone_work->addr;
  87         struct net_device *dev = standalone_work->dev;
  88         struct dsa_port *dp = dsa_user_to_port(dev);
  89         struct switchdev_obj_port_mdb mdb;
  90         struct dsa_switch *ds = dp->ds;
  91         u16 vid = standalone_work->vid;
  92         int err;
  93
  94         switch (standalone_work->event) {
  95         case DSA_UC_ADD:
  96                 err = dsa_port_standalone_host_fdb_add(dp, addr, vid);
  97                 if (err) {
  98                         dev_err(ds->dev,
  99                                 "port %d failed to add %pM vid %d to fdb: %d\n",
 100                                 dp->index, addr, vid, err);
 101                         break;
 102                 }
 103                 break;
 104
 105         case DSA_UC_DEL:
 106                 err = dsa_port_standalone_host_fdb_del(dp, addr, vid);
 107                 if (err) {
 108                         dev_err(ds->dev,
 109                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
 110                                 dp->index, addr, vid, err);
 111                 }
 112
 113                 break;
 114         case DSA_MC_ADD:
 115                 ether_addr_copy(mdb.addr, addr);
 116                 mdb.vid = vid;
 117
 118                 err = dsa_port_standalone_host_mdb_add(dp, &mdb);
 119                 if (err) {
 120                         dev_err(ds->dev,
 121                                 "port %d failed to add %pM vid %d to mdb: %d\n",
 122                                 dp->index, addr, vid, err);
 123                         break;
 124                 }
 125                 break;
 126         case DSA_MC_DEL:
 127                 ether_addr_copy(mdb.addr, addr);
 128                 mdb.vid = vid;
 129
 130                 err = dsa_port_standalone_host_mdb_del(dp, &mdb);
 131                 if (err) {
 132                         dev_err(ds->dev,
 133                                 "port %d failed to delete %pM vid %d from mdb: %d\n",
 134                                 dp->index, addr, vid, err);
 135                 }
 136
 137                 break;
 138         }
 139
 140         kfree(standalone_work);
 141 }
 142
 143 static int dsa_user_schedule_standalone_work(struct net_device *dev,
 144                                              enum dsa_standalone_event event,
 145                                              const unsigned char *addr,
 146                                              u16 vid)
 147 {
 148         struct dsa_standalone_event_work *standalone_work;
 149
 150         standalone_work = kzalloc(sizeof(*standalone_work), GFP_ATOMIC);
 151         if (!standalone_work)
 152                 return -ENOMEM;
 153
 154         INIT_WORK(&standalone_work->work, dsa_user_standalone_event_work);
 155         standalone_work->event = event;
 156         standalone_work->dev = dev;
 157
 158         ether_addr_copy(standalone_work->addr, addr);
 159         standalone_work->vid = vid;
 160
 161         dsa_schedule_work(&standalone_work->work);
 162
 163         return 0;
 164 }
 165
 166 static int dsa_user_host_vlan_rx_filtering(void *arg, int vid)
 167 {
 168         struct dsa_host_vlan_rx_filtering_ctx *ctx = arg;
 169
 170         return dsa_user_schedule_standalone_work(ctx->dev, ctx->event,
 171                                                   ctx->addr, vid);
 172 }
 173
 174 static int dsa_user_vlan_for_each(struct net_device *dev,
 175                                   int (*cb)(void *arg, int vid), void *arg)
 176 {
 177         struct dsa_port *dp = dsa_user_to_port(dev);
 178         struct dsa_vlan *v;
 179         int err;
 180
 181         lockdep_assert_held(&dev->addr_list_lock);
 182
 183         err = cb(arg, 0);
 184         if (err)
 185                 return err;
 186
 187         list_for_each_entry(v, &dp->user_vlans, list) {
 188                 err = cb(arg, v->vid);
 189                 if (err)
 190                         return err;
 191         }
 192
 193         return 0;
 194 }
 195
 196 static int dsa_user_sync_uc(struct net_device *dev,
 197                             const unsigned char *addr)
 198 {
 199         struct net_device *conduit = dsa_user_to_conduit(dev);
 200         struct dsa_port *dp = dsa_user_to_port(dev);
 201         struct dsa_host_vlan_rx_filtering_ctx ctx = {
 202                 .dev = dev,
 203                 .addr = addr,
 204                 .event = DSA_UC_ADD,
 205         };
 206
 207         dev_uc_add(conduit, addr);
 208
 209         if (!dsa_switch_supports_uc_filtering(dp->ds))
 210                 return 0;
 211
 212         return dsa_user_vlan_for_each(dev, dsa_user_host_vlan_rx_filtering,
 213                                        &ctx);
 214 }
 215
 216 static int dsa_user_unsync_uc(struct net_device *dev,
 217                               const unsigned char *addr)
 218 {
 219         struct net_device *conduit = dsa_user_to_conduit(dev);
 220         struct dsa_port *dp = dsa_user_to_port(dev);
 221         struct dsa_host_vlan_rx_filtering_ctx ctx = {
 222                 .dev = dev,
 223                 .addr = addr,
 224                 .event = DSA_UC_DEL,
 225         };
 226
 227         dev_uc_del(conduit, addr);
 228
 229         if (!dsa_switch_supports_uc_filtering(dp->ds))
 230                 return 0;
 231
 232         return dsa_user_vlan_for_each(dev, dsa_user_host_vlan_rx_filtering,
 233                                        &ctx);
 234 }
 235
 236 static int dsa_user_sync_mc(struct net_device *dev,
 237                             const unsigned char *addr)
 238 {
 239         struct net_device *conduit = dsa_user_to_conduit(dev);
 240         struct dsa_port *dp = dsa_user_to_port(dev);
 241         struct dsa_host_vlan_rx_filtering_ctx ctx = {
 242                 .dev = dev,
 243                 .addr = addr,
 244                 .event = DSA_MC_ADD,
 245         };
 246
 247         dev_mc_add(conduit, addr);
 248
 249         if (!dsa_switch_supports_mc_filtering(dp->ds))
 250                 return 0;
 251
 252         return dsa_user_vlan_for_each(dev, dsa_user_host_vlan_rx_filtering,
 253                                        &ctx);
 254 }
 255
 256 static int dsa_user_unsync_mc(struct net_device *dev,
 257                               const unsigned char *addr)
 258 {
 259         struct net_device *conduit = dsa_user_to_conduit(dev);
 260         struct dsa_port *dp = dsa_user_to_port(dev);
 261         struct dsa_host_vlan_rx_filtering_ctx ctx = {
 262                 .dev = dev,
 263                 .addr = addr,
 264                 .event = DSA_MC_DEL,
 265         };
 266
 267         dev_mc_del(conduit, addr);
 268
 269         if (!dsa_switch_supports_mc_filtering(dp->ds))
 270                 return 0;
 271
 272         return dsa_user_vlan_for_each(dev, dsa_user_host_vlan_rx_filtering,
 273                                        &ctx);
 274 }
 275
 276 void dsa_user_sync_ha(struct net_device *dev)
 277 {
 278         struct dsa_port *dp = dsa_user_to_port(dev);
 279         struct dsa_switch *ds = dp->ds;
 280         struct netdev_hw_addr *ha;
 281
 282         netif_addr_lock_bh(dev);
 283
 284         netdev_for_each_synced_mc_addr(ha, dev)
 285                 dsa_user_sync_mc(dev, ha->addr);
 286
 287         netdev_for_each_synced_uc_addr(ha, dev)
 288                 dsa_user_sync_uc(dev, ha->addr);
 289
 290         netif_addr_unlock_bh(dev);
 291
 292         if (dsa_switch_supports_uc_filtering(ds) ||
 293             dsa_switch_supports_mc_filtering(ds))
 294                 dsa_flush_workqueue();
 295 }
 296
 297 void dsa_user_unsync_ha(struct net_device *dev)
 298 {
 299         struct dsa_port *dp = dsa_user_to_port(dev);
 300         struct dsa_switch *ds = dp->ds;
 301         struct netdev_hw_addr *ha;
 302
 303         netif_addr_lock_bh(dev);
 304
 305         netdev_for_each_synced_uc_addr(ha, dev)
 306                 dsa_user_unsync_uc(dev, ha->addr);
 307
 308         netdev_for_each_synced_mc_addr(ha, dev)
 309                 dsa_user_unsync_mc(dev, ha->addr);
 310
 311         netif_addr_unlock_bh(dev);
 312
 313         if (dsa_switch_supports_uc_filtering(ds) ||
 314             dsa_switch_supports_mc_filtering(ds))
 315                 dsa_flush_workqueue();
 316 }
 317
 318 /* user mii_bus handling ***************************************************/
 319 static int dsa_user_phy_read(struct mii_bus *bus, int addr, int reg)
 320 {
 321         struct dsa_switch *ds = bus->priv;
 322
 323         if (ds->phys_mii_mask & (1 << addr))
 324                 return ds->ops->phy_read(ds, addr, reg);
 325
 326         return 0xffff;
 327 }
 328
 329 static int dsa_user_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
 330 {
 331         struct dsa_switch *ds = bus->priv;
 332
 333         if (ds->phys_mii_mask & (1 << addr))
 334                 return ds->ops->phy_write(ds, addr, reg, val);
 335
 336         return 0;
 337 }
 338
 339 void dsa_user_mii_bus_init(struct dsa_switch *ds)
 340 {
 341         ds->user_mii_bus->priv = (void *)ds;
 342         ds->user_mii_bus->name = "dsa user smi";
 343         ds->user_mii_bus->read = dsa_user_phy_read;
 344         ds->user_mii_bus->write = dsa_user_phy_write;
 345         snprintf(ds->user_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
 346                  ds->dst->index, ds->index);
 347         ds->user_mii_bus->parent = ds->dev;
 348         ds->user_mii_bus->phy_mask = ~ds->phys_mii_mask;
 349 }
 350
 351
 352 /* user device handling ****************************************************/
 353 static int dsa_user_get_iflink(const struct net_device *dev)
 354 {
 355         return dsa_user_to_conduit(dev)->ifindex;
 356 }
 357
 358 static int dsa_user_open(struct net_device *dev)
 359 {
 360         struct net_device *conduit = dsa_user_to_conduit(dev);
 361         struct dsa_port *dp = dsa_user_to_port(dev);
 362         struct dsa_switch *ds = dp->ds;
 363         int err;
 364
 365         err = dev_open(conduit, NULL);
 366         if (err < 0) {
 367                 netdev_err(dev, "failed to open conduit %s\n", conduit->name);
 368                 goto out;
 369         }
 370
 371         if (dsa_switch_supports_uc_filtering(ds)) {
 372                 err = dsa_port_standalone_host_fdb_add(dp, dev->dev_addr, 0);
 373                 if (err)
 374                         goto out;
 375         }
 376
 377         if (!ether_addr_equal(dev->dev_addr, conduit->dev_addr)) {
 378                 err = dev_uc_add(conduit, dev->dev_addr);
 379                 if (err < 0)
 380                         goto del_host_addr;
 381         }
 382
 383         err = dsa_port_enable_rt(dp, dev->phydev);
 384         if (err)
 385                 goto del_unicast;
 386
 387         return 0;
 388
 389 del_unicast:
 390         if (!ether_addr_equal(dev->dev_addr, conduit->dev_addr))
 391                 dev_uc_del(conduit, dev->dev_addr);
 392 del_host_addr:
 393         if (dsa_switch_supports_uc_filtering(ds))
 394                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 395 out:
 396         return err;
 397 }
 398
 399 static int dsa_user_close(struct net_device *dev)
 400 {
 401         struct net_device *conduit = dsa_user_to_conduit(dev);
 402         struct dsa_port *dp = dsa_user_to_port(dev);
 403         struct dsa_switch *ds = dp->ds;
 404
 405         dsa_port_disable_rt(dp);
 406
 407         if (!ether_addr_equal(dev->dev_addr, conduit->dev_addr))
 408                 dev_uc_del(conduit, dev->dev_addr);
 409
 410         if (dsa_switch_supports_uc_filtering(ds))
 411                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 412
 413         return 0;
 414 }
 415
 416 static void dsa_user_manage_host_flood(struct net_device *dev)
 417 {
 418         bool mc = dev->flags & (IFF_PROMISC | IFF_ALLMULTI);
 419         struct dsa_port *dp = dsa_user_to_port(dev);
 420         bool uc = dev->flags & IFF_PROMISC;
 421
 422         dsa_port_set_host_flood(dp, uc, mc);
 423 }
 424
 425 static void dsa_user_change_rx_flags(struct net_device *dev, int change)
 426 {
 427         struct net_device *conduit = dsa_user_to_conduit(dev);
 428         struct dsa_port *dp = dsa_user_to_port(dev);
 429         struct dsa_switch *ds = dp->ds;
 430
 431         if (change & IFF_ALLMULTI)
 432                 dev_set_allmulti(conduit,
 433                                  dev->flags & IFF_ALLMULTI ? 1 : -1);
 434         if (change & IFF_PROMISC)
 435                 dev_set_promiscuity(conduit,
 436                                     dev->flags & IFF_PROMISC ? 1 : -1);
 437
 438         if (dsa_switch_supports_uc_filtering(ds) &&
 439             dsa_switch_supports_mc_filtering(ds))
 440                 dsa_user_manage_host_flood(dev);
 441 }
 442
 443 static void dsa_user_set_rx_mode(struct net_device *dev)
 444 {
 445         __dev_mc_sync(dev, dsa_user_sync_mc, dsa_user_unsync_mc);
 446         __dev_uc_sync(dev, dsa_user_sync_uc, dsa_user_unsync_uc);
 447 }
 448
 449 static int dsa_user_set_mac_address(struct net_device *dev, void *a)
 450 {
 451         struct net_device *conduit = dsa_user_to_conduit(dev);
 452         struct dsa_port *dp = dsa_user_to_port(dev);
 453         struct dsa_switch *ds = dp->ds;
 454         struct sockaddr *addr = a;
 455         int err;
 456
 457         if (!is_valid_ether_addr(addr->sa_data))
 458                 return -EADDRNOTAVAIL;
 459
 460         if (ds->ops->port_set_mac_address) {
 461                 err = ds->ops->port_set_mac_address(ds, dp->index,
 462                                                     addr->sa_data);
 463                 if (err)
 464                         return err;
 465         }
 466
 467         /* If the port is down, the address isn't synced yet to hardware or
 468          * to the DSA conduit, so there is nothing to change.
 469          */
 470         if (!(dev->flags & IFF_UP))
 471                 goto out_change_dev_addr;
 472
 473         if (dsa_switch_supports_uc_filtering(ds)) {
 474                 err = dsa_port_standalone_host_fdb_add(dp, addr->sa_data, 0);
 475                 if (err)
 476                         return err;
 477         }
 478
 479         if (!ether_addr_equal(addr->sa_data, conduit->dev_addr)) {
 480                 err = dev_uc_add(conduit, addr->sa_data);
 481                 if (err < 0)
 482                         goto del_unicast;
 483         }
 484
 485         if (!ether_addr_equal(dev->dev_addr, conduit->dev_addr))
 486                 dev_uc_del(conduit, dev->dev_addr);
 487
 488         if (dsa_switch_supports_uc_filtering(ds))
 489                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 490
 491 out_change_dev_addr:
 492         eth_hw_addr_set(dev, addr->sa_data);
 493
 494         return 0;
 495
 496 del_unicast:
 497         if (dsa_switch_supports_uc_filtering(ds))
 498                 dsa_port_standalone_host_fdb_del(dp, addr->sa_data, 0);
 499
 500         return err;
 501 }
 502
 503 struct dsa_user_dump_ctx {
 504         struct net_device *dev;
 505         struct sk_buff *skb;
 506         struct netlink_callback *cb;
 507         int idx;
 508 };
 509
 510 static int
 511 dsa_user_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 512                           bool is_static, void *data)
 513 {
 514         struct dsa_user_dump_ctx *dump = data;
 515         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 516         u32 seq = dump->cb->nlh->nlmsg_seq;
 517         struct nlmsghdr *nlh;
 518         struct ndmsg *ndm;
 519
 520         if (dump->idx < dump->cb->args[2])
 521                 goto skip;
 522
 523         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 524                         sizeof(*ndm), NLM_F_MULTI);
 525         if (!nlh)
 526                 return -EMSGSIZE;
 527
 528         ndm = nlmsg_data(nlh);
 529         ndm->ndm_family  = AF_BRIDGE;
 530         ndm->ndm_pad1    = 0;
 531         ndm->ndm_pad2    = 0;
 532         ndm->ndm_flags   = NTF_SELF;
 533         ndm->ndm_type    = 0;
 534         ndm->ndm_ifindex = dump->dev->ifindex;
 535         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 536
 537         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 538                 goto nla_put_failure;
 539
 540         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 541                 goto nla_put_failure;
 542
 543         nlmsg_end(dump->skb, nlh);
 544
 545 skip:
 546         dump->idx++;
 547         return 0;
 548
 549 nla_put_failure:
 550         nlmsg_cancel(dump->skb, nlh);
 551         return -EMSGSIZE;
 552 }
 553
 554 static int
 555 dsa_user_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 556                   struct net_device *dev, struct net_device *filter_dev,
 557                   int *idx)
 558 {
 559         struct dsa_port *dp = dsa_user_to_port(dev);
 560         struct dsa_user_dump_ctx dump = {
 561                 .dev = dev,
 562                 .skb = skb,
 563                 .cb = cb,
 564                 .idx = *idx,
 565         };
 566         int err;
 567
 568         err = dsa_port_fdb_dump(dp, dsa_user_port_fdb_do_dump, &dump);
 569         *idx = dump.idx;
 570
 571         return err;
 572 }
 573
 574 static int dsa_user_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 575 {
 576         struct dsa_user_priv *p = netdev_priv(dev);
 577         struct dsa_switch *ds = p->dp->ds;
 578         int port = p->dp->index;
 579
 580         /* Pass through to switch driver if it supports timestamping */
 581         switch (cmd) {
 582         case SIOCGHWTSTAMP:
 583                 if (ds->ops->port_hwtstamp_get)
 584                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 585                 break;
 586         case SIOCSHWTSTAMP:
 587                 if (ds->ops->port_hwtstamp_set)
 588                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 589                 break;
 590         }
 591
 592         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 593 }
 594
 595 static int dsa_user_port_attr_set(struct net_device *dev, const void *ctx,
 596                                   const struct switchdev_attr *attr,
 597                                   struct netlink_ext_ack *extack)
 598 {
 599         struct dsa_port *dp = dsa_user_to_port(dev);
 600         int ret;
 601
 602         if (ctx && ctx != dp)
 603                 return 0;
 604
 605         switch (attr->id) {
 606         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 607                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 608                         return -EOPNOTSUPP;
 609
 610                 ret = dsa_port_set_state(dp, attr->u.stp_state, true);
 611                 break;
 612         case SWITCHDEV_ATTR_ID_PORT_MST_STATE:
 613                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 614                         return -EOPNOTSUPP;
 615
 616                 ret = dsa_port_set_mst_state(dp, &attr->u.mst_state, extack);
 617                 break;
 618         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 619                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 620                         return -EOPNOTSUPP;
 621
 622                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 623                                               extack);
 624                 break;
 625         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 626                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 627                         return -EOPNOTSUPP;
 628
 629                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 630                 break;
 631         case SWITCHDEV_ATTR_ID_BRIDGE_MST:
 632                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 633                         return -EOPNOTSUPP;
 634
 635                 ret = dsa_port_mst_enable(dp, attr->u.mst, extack);
 636                 break;
 637         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 638                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 639                         return -EOPNOTSUPP;
 640
 641                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 642                                                 extack);
 643                 break;
 644         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 645                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 646                         return -EOPNOTSUPP;
 647
 648                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 649                 break;
 650         case SWITCHDEV_ATTR_ID_VLAN_MSTI:
 651                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 652                         return -EOPNOTSUPP;
 653
 654                 ret = dsa_port_vlan_msti(dp, &attr->u.vlan_msti);
 655                 break;
 656         default:
 657                 ret = -EOPNOTSUPP;
 658                 break;
 659         }
 660
 661         return ret;
 662 }
 663
 664 /* Must be called under rcu_read_lock() */
 665 static int
 666 dsa_user_vlan_check_for_8021q_uppers(struct net_device *user,
 667                                      const struct switchdev_obj_port_vlan *vlan)
 668 {
 669         struct net_device *upper_dev;
 670         struct list_head *iter;
 671
 672         netdev_for_each_upper_dev_rcu(user, upper_dev, iter) {
 673                 u16 vid;
 674
 675                 if (!is_vlan_dev(upper_dev))
 676                         continue;
 677
 678                 vid = vlan_dev_vlan_id(upper_dev);
 679                 if (vid == vlan->vid)
 680                         return -EBUSY;
 681         }
 682
 683         return 0;
 684 }
 685
 686 static int dsa_user_vlan_add(struct net_device *dev,
 687                              const struct switchdev_obj *obj,
 688                              struct netlink_ext_ack *extack)
 689 {
 690         struct dsa_port *dp = dsa_user_to_port(dev);
 691         struct switchdev_obj_port_vlan *vlan;
 692         int err;
 693
 694         if (dsa_port_skip_vlan_configuration(dp)) {
 695                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 696                 return 0;
 697         }
 698
 699         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 700
 701         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 702          * the same VID.
 703          */
 704         if (br_vlan_enabled(dsa_port_bridge_dev_get(dp))) {
 705                 rcu_read_lock();
 706                 err = dsa_user_vlan_check_for_8021q_uppers(dev, vlan);
 707                 rcu_read_unlock();
 708                 if (err) {
 709                         NL_SET_ERR_MSG_MOD(extack,
 710                                            "Port already has a VLAN upper with this VID");
 711                         return err;
 712                 }
 713         }
 714
 715         return dsa_port_vlan_add(dp, vlan, extack);
 716 }
 717
 718 /* Offload a VLAN installed on the bridge or on a foreign interface by
 719  * installing it as a VLAN towards the CPU port.
 720  */
 721 static int dsa_user_host_vlan_add(struct net_device *dev,
 722                                   const struct switchdev_obj *obj,
 723                                   struct netlink_ext_ack *extack)
 724 {
 725         struct dsa_port *dp = dsa_user_to_port(dev);
 726         struct switchdev_obj_port_vlan vlan;
 727
 728         /* Do nothing if this is a software bridge */
 729         if (!dp->bridge)
 730                 return -EOPNOTSUPP;
 731
 732         if (dsa_port_skip_vlan_configuration(dp)) {
 733                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 734                 return 0;
 735         }
 736
 737         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 738
 739         /* Even though drivers often handle CPU membership in special ways,
 740          * it doesn't make sense to program a PVID, so clear this flag.
 741          */
 742         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 743
 744         return dsa_port_host_vlan_add(dp, &vlan, extack);
 745 }
 746
 747 static int dsa_user_port_obj_add(struct net_device *dev, const void *ctx,
 748                                  const struct switchdev_obj *obj,
 749                                  struct netlink_ext_ack *extack)
 750 {
 751         struct dsa_port *dp = dsa_user_to_port(dev);
 752         int err;
 753
 754         if (ctx && ctx != dp)
 755                 return 0;
 756
 757         switch (obj->id) {
 758         case SWITCHDEV_OBJ_ID_PORT_MDB:
 759                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 760                         return -EOPNOTSUPP;
 761
 762                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 763                 break;
 764         case SWITCHDEV_OBJ_ID_HOST_MDB:
 765                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 766                         return -EOPNOTSUPP;
 767
 768                 err = dsa_port_bridge_host_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 769                 break;
 770         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 771                 if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 772                         err = dsa_user_vlan_add(dev, obj, extack);
 773                 else
 774                         err = dsa_user_host_vlan_add(dev, obj, extack);
 775                 break;
 776         case SWITCHDEV_OBJ_ID_MRP:
 777                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 778                         return -EOPNOTSUPP;
 779
 780                 err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 781                 break;
 782         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 783                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 784                         return -EOPNOTSUPP;
 785
 786                 err = dsa_port_mrp_add_ring_role(dp,
 787                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 788                 break;
 789         default:
 790                 err = -EOPNOTSUPP;
 791                 break;
 792         }
 793
 794         return err;
 795 }
 796
 797 static int dsa_user_vlan_del(struct net_device *dev,
 798                              const struct switchdev_obj *obj)
 799 {
 800         struct dsa_port *dp = dsa_user_to_port(dev);
 801         struct switchdev_obj_port_vlan *vlan;
 802
 803         if (dsa_port_skip_vlan_configuration(dp))
 804                 return 0;
 805
 806         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 807
 808         return dsa_port_vlan_del(dp, vlan);
 809 }
 810
 811 static int dsa_user_host_vlan_del(struct net_device *dev,
 812                                   const struct switchdev_obj *obj)
 813 {
 814         struct dsa_port *dp = dsa_user_to_port(dev);
 815         struct switchdev_obj_port_vlan *vlan;
 816
 817         /* Do nothing if this is a software bridge */
 818         if (!dp->bridge)
 819                 return -EOPNOTSUPP;
 820
 821         if (dsa_port_skip_vlan_configuration(dp))
 822                 return 0;
 823
 824         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 825
 826         return dsa_port_host_vlan_del(dp, vlan);
 827 }
 828
 829 static int dsa_user_port_obj_del(struct net_device *dev, const void *ctx,
 830                                  const struct switchdev_obj *obj)
 831 {
 832         struct dsa_port *dp = dsa_user_to_port(dev);
 833         int err;
 834
 835         if (ctx && ctx != dp)
 836                 return 0;
 837
 838         switch (obj->id) {
 839         case SWITCHDEV_OBJ_ID_PORT_MDB:
 840                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 841                         return -EOPNOTSUPP;
 842
 843                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 844                 break;
 845         case SWITCHDEV_OBJ_ID_HOST_MDB:
 846                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 847                         return -EOPNOTSUPP;
 848
 849                 err = dsa_port_bridge_host_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 850                 break;
 851         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 852                 if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 853                         err = dsa_user_vlan_del(dev, obj);
 854                 else
 855                         err = dsa_user_host_vlan_del(dev, obj);
 856                 break;
 857         case SWITCHDEV_OBJ_ID_MRP:
 858                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 859                         return -EOPNOTSUPP;
 860
 861                 err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 862                 break;
 863         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 864                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 865                         return -EOPNOTSUPP;
 866
 867                 err = dsa_port_mrp_del_ring_role(dp,
 868                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 869                 break;
 870         default:
 871                 err = -EOPNOTSUPP;
 872                 break;
 873         }
 874
 875         return err;
 876 }
 877
 878 static inline netdev_tx_t dsa_user_netpoll_send_skb(struct net_device *dev,
 879                                                     struct sk_buff *skb)
 880 {
 881 #ifdef CONFIG_NET_POLL_CONTROLLER
 882         struct dsa_user_priv *p = netdev_priv(dev);
 883
 884         return netpoll_send_skb(p->netpoll, skb);
 885 #else
 886         BUG();
 887         return NETDEV_TX_OK;
 888 #endif
 889 }
 890
 891 static void dsa_skb_tx_timestamp(struct dsa_user_priv *p,
 892                                  struct sk_buff *skb)
 893 {
 894         struct dsa_switch *ds = p->dp->ds;
 895
 896         if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 897                 return;
 898
 899         if (!ds->ops->port_txtstamp)
 900                 return;
 901
 902         ds->ops->port_txtstamp(ds, p->dp->index, skb);
 903 }
 904
 905 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 906 {
 907         /* SKB for netpoll still need to be mangled with the protocol-specific
 908          * tag to be successfully transmitted
 909          */
 910         if (unlikely(netpoll_tx_running(dev)))
 911                 return dsa_user_netpoll_send_skb(dev, skb);
 912
 913         /* Queue the SKB for transmission on the parent interface, but
 914          * do not modify its EtherType
 915          */
 916         skb->dev = dsa_user_to_conduit(dev);
 917         dev_queue_xmit(skb);
 918
 919         return NETDEV_TX_OK;
 920 }
 921 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 922
 923 static netdev_tx_t dsa_user_xmit(struct sk_buff *skb, struct net_device *dev)
 924 {
 925         struct dsa_user_priv *p = netdev_priv(dev);
 926         struct sk_buff *nskb;
 927
 928         dev_sw_netstats_tx_add(dev, 1, skb->len);
 929
 930         memset(skb->cb, 0, sizeof(skb->cb));
 931
 932         /* Handle tx timestamp if any */
 933         dsa_skb_tx_timestamp(p, skb);
 934
 935         if (skb_ensure_writable_head_tail(skb, dev)) {
 936                 dev_kfree_skb_any(skb);
 937                 return NETDEV_TX_OK;
 938         }
 939
 940         /* needed_tailroom should still be 'warm' in the cache line from
 941          * skb_ensure_writable_head_tail(), which has also ensured that
 942          * padding is safe.
 943          */
 944         if (dev->needed_tailroom)
 945                 eth_skb_pad(skb);
 946
 947         /* Transmit function may have to reallocate the original SKB,
 948          * in which case it must have freed it. Only free it here on error.
 949          */
 950         nskb = p->xmit(skb, dev);
 951         if (!nskb) {
 952                 kfree_skb(skb);
 953                 return NETDEV_TX_OK;
 954         }
 955
 956         return dsa_enqueue_skb(nskb, dev);
 957 }
 958
 959 /* ethtool operations *******************************************************/
 960
 961 static void dsa_user_get_drvinfo(struct net_device *dev,
 962                                  struct ethtool_drvinfo *drvinfo)
 963 {
 964         strscpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 965         strscpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 966         strscpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 967 }
 968
 969 static int dsa_user_get_regs_len(struct net_device *dev)
 970 {
 971         struct dsa_port *dp = dsa_user_to_port(dev);
 972         struct dsa_switch *ds = dp->ds;
 973
 974         if (ds->ops->get_regs_len)
 975                 return ds->ops->get_regs_len(ds, dp->index);
 976
 977         return -EOPNOTSUPP;
 978 }
 979
 980 static void
 981 dsa_user_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 982 {
 983         struct dsa_port *dp = dsa_user_to_port(dev);
 984         struct dsa_switch *ds = dp->ds;
 985
 986         if (ds->ops->get_regs)
 987                 ds->ops->get_regs(ds, dp->index, regs, _p);
 988 }
 989
 990 static int dsa_user_nway_reset(struct net_device *dev)
 991 {
 992         struct dsa_port *dp = dsa_user_to_port(dev);
 993
 994         return phylink_ethtool_nway_reset(dp->pl);
 995 }
 996
 997 static int dsa_user_get_eeprom_len(struct net_device *dev)
 998 {
 999         struct dsa_port *dp = dsa_user_to_port(dev);
1000         struct dsa_switch *ds = dp->ds;
1001
1002         if (ds->cd && ds->cd->eeprom_len)
1003                 return ds->cd->eeprom_len;
1004
1005         if (ds->ops->get_eeprom_len)
1006                 return ds->ops->get_eeprom_len(ds);
1007
1008         return 0;
1009 }
1010
1011 static int dsa_user_get_eeprom(struct net_device *dev,
1012                                struct ethtool_eeprom *eeprom, u8 *data)
1013 {
1014         struct dsa_port *dp = dsa_user_to_port(dev);
1015         struct dsa_switch *ds = dp->ds;
1016
1017         if (ds->ops->get_eeprom)
1018                 return ds->ops->get_eeprom(ds, eeprom, data);
1019
1020         return -EOPNOTSUPP;
1021 }
1022
1023 static int dsa_user_set_eeprom(struct net_device *dev,
1024                                struct ethtool_eeprom *eeprom, u8 *data)
1025 {
1026         struct dsa_port *dp = dsa_user_to_port(dev);
1027         struct dsa_switch *ds = dp->ds;
1028
1029         if (ds->ops->set_eeprom)
1030                 return ds->ops->set_eeprom(ds, eeprom, data);
1031
1032         return -EOPNOTSUPP;
1033 }
1034
1035 static void dsa_user_get_strings(struct net_device *dev,
1036                                  uint32_t stringset, uint8_t *data)
1037 {
1038         struct dsa_port *dp = dsa_user_to_port(dev);
1039         struct dsa_switch *ds = dp->ds;
1040
1041         if (stringset == ETH_SS_STATS) {
1042                 int len = ETH_GSTRING_LEN;
1043
1044                 strscpy_pad(data, "tx_packets", len);
1045                 strscpy_pad(data + len, "tx_bytes", len);
1046                 strscpy_pad(data + 2 * len, "rx_packets", len);
1047                 strscpy_pad(data + 3 * len, "rx_bytes", len);
1048                 if (ds->ops->get_strings)
1049                         ds->ops->get_strings(ds, dp->index, stringset,
1050                                              data + 4 * len);
1051         } else if (stringset ==  ETH_SS_TEST) {
1052                 net_selftest_get_strings(data);
1053         }
1054
1055 }
1056
1057 static void dsa_user_get_ethtool_stats(struct net_device *dev,
1058                                        struct ethtool_stats *stats,
1059                                        uint64_t *data)
1060 {
1061         struct dsa_port *dp = dsa_user_to_port(dev);
1062         struct dsa_switch *ds = dp->ds;
1063         struct pcpu_sw_netstats *s;
1064         unsigned int start;
1065         int i;
1066
1067         for_each_possible_cpu(i) {
1068                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
1069
1070                 s = per_cpu_ptr(dev->tstats, i);
1071                 do {
1072                         start = u64_stats_fetch_begin(&s->syncp);
1073                         tx_packets = u64_stats_read(&s->tx_packets);
1074                         tx_bytes = u64_stats_read(&s->tx_bytes);
1075                         rx_packets = u64_stats_read(&s->rx_packets);
1076                         rx_bytes = u64_stats_read(&s->rx_bytes);
1077                 } while (u64_stats_fetch_retry(&s->syncp, start));
1078                 data[0] += tx_packets;
1079                 data[1] += tx_bytes;
1080                 data[2] += rx_packets;
1081                 data[3] += rx_bytes;
1082         }
1083         if (ds->ops->get_ethtool_stats)
1084                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
1085 }
1086
1087 static int dsa_user_get_sset_count(struct net_device *dev, int sset)
1088 {
1089         struct dsa_port *dp = dsa_user_to_port(dev);
1090         struct dsa_switch *ds = dp->ds;
1091
1092         if (sset == ETH_SS_STATS) {
1093                 int count = 0;
1094
1095                 if (ds->ops->get_sset_count) {
1096                         count = ds->ops->get_sset_count(ds, dp->index, sset);
1097                         if (count < 0)
1098                                 return count;
1099                 }
1100
1101                 return count + 4;
1102         } else if (sset ==  ETH_SS_TEST) {
1103                 return net_selftest_get_count();
1104         }
1105
1106         return -EOPNOTSUPP;
1107 }
1108
1109 static void dsa_user_get_eth_phy_stats(struct net_device *dev,
1110                                        struct ethtool_eth_phy_stats *phy_stats)
1111 {
1112         struct dsa_port *dp = dsa_user_to_port(dev);
1113         struct dsa_switch *ds = dp->ds;
1114
1115         if (ds->ops->get_eth_phy_stats)
1116                 ds->ops->get_eth_phy_stats(ds, dp->index, phy_stats);
1117 }
1118
1119 static void dsa_user_get_eth_mac_stats(struct net_device *dev,
1120                                        struct ethtool_eth_mac_stats *mac_stats)
1121 {
1122         struct dsa_port *dp = dsa_user_to_port(dev);
1123         struct dsa_switch *ds = dp->ds;
1124
1125         if (ds->ops->get_eth_mac_stats)
1126                 ds->ops->get_eth_mac_stats(ds, dp->index, mac_stats);
1127 }
1128
1129 static void
1130 dsa_user_get_eth_ctrl_stats(struct net_device *dev,
1131                             struct ethtool_eth_ctrl_stats *ctrl_stats)
1132 {
1133         struct dsa_port *dp = dsa_user_to_port(dev);
1134         struct dsa_switch *ds = dp->ds;
1135
1136         if (ds->ops->get_eth_ctrl_stats)
1137                 ds->ops->get_eth_ctrl_stats(ds, dp->index, ctrl_stats);
1138 }
1139
1140 static void
1141 dsa_user_get_rmon_stats(struct net_device *dev,
1142                         struct ethtool_rmon_stats *rmon_stats,
1143                         const struct ethtool_rmon_hist_range **ranges)
1144 {
1145         struct dsa_port *dp = dsa_user_to_port(dev);
1146         struct dsa_switch *ds = dp->ds;
1147
1148         if (ds->ops->get_rmon_stats)
1149                 ds->ops->get_rmon_stats(ds, dp->index, rmon_stats, ranges);
1150 }
1151
1152 static void dsa_user_net_selftest(struct net_device *ndev,
1153                                   struct ethtool_test *etest, u64 *buf)
1154 {
1155         struct dsa_port *dp = dsa_user_to_port(ndev);
1156         struct dsa_switch *ds = dp->ds;
1157
1158         if (ds->ops->self_test) {
1159                 ds->ops->self_test(ds, dp->index, etest, buf);
1160                 return;
1161         }
1162
1163         net_selftest(ndev, etest, buf);
1164 }
1165
1166 static int dsa_user_get_mm(struct net_device *dev,
1167                            struct ethtool_mm_state *state)
1168 {
1169         struct dsa_port *dp = dsa_user_to_port(dev);
1170         struct dsa_switch *ds = dp->ds;
1171
1172         if (!ds->ops->get_mm)
1173                 return -EOPNOTSUPP;
1174
1175         return ds->ops->get_mm(ds, dp->index, state);
1176 }
1177
1178 static int dsa_user_set_mm(struct net_device *dev, struct ethtool_mm_cfg *cfg,
1179                            struct netlink_ext_ack *extack)
1180 {
1181         struct dsa_port *dp = dsa_user_to_port(dev);
1182         struct dsa_switch *ds = dp->ds;
1183
1184         if (!ds->ops->set_mm)
1185                 return -EOPNOTSUPP;
1186
1187         return ds->ops->set_mm(ds, dp->index, cfg, extack);
1188 }
1189
1190 static void dsa_user_get_mm_stats(struct net_device *dev,
1191                                   struct ethtool_mm_stats *stats)
1192 {
1193         struct dsa_port *dp = dsa_user_to_port(dev);
1194         struct dsa_switch *ds = dp->ds;
1195
1196         if (ds->ops->get_mm_stats)
1197                 ds->ops->get_mm_stats(ds, dp->index, stats);
1198 }
1199
1200 static void dsa_user_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1201 {
1202         struct dsa_port *dp = dsa_user_to_port(dev);
1203         struct dsa_switch *ds = dp->ds;
1204
1205         phylink_ethtool_get_wol(dp->pl, w);
1206
1207         if (ds->ops->get_wol)
1208                 ds->ops->get_wol(ds, dp->index, w);
1209 }
1210
1211 static int dsa_user_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1212 {
1213         struct dsa_port *dp = dsa_user_to_port(dev);
1214         struct dsa_switch *ds = dp->ds;
1215         int ret = -EOPNOTSUPP;
1216
1217         phylink_ethtool_set_wol(dp->pl, w);
1218
1219         if (ds->ops->set_wol)
1220                 ret = ds->ops->set_wol(ds, dp->index, w);
1221
1222         return ret;
1223 }
1224
1225 static int dsa_user_set_eee(struct net_device *dev, struct ethtool_eee *e)
1226 {
1227         struct dsa_port *dp = dsa_user_to_port(dev);
1228         struct dsa_switch *ds = dp->ds;
1229         int ret;
1230
1231         /* Port's PHY and MAC both need to be EEE capable */
1232         if (!dev->phydev || !dp->pl)
1233                 return -ENODEV;
1234
1235         if (!ds->ops->set_mac_eee)
1236                 return -EOPNOTSUPP;
1237
1238         ret = ds->ops->set_mac_eee(ds, dp->index, e);
1239         if (ret)
1240                 return ret;
1241
1242         return phylink_ethtool_set_eee(dp->pl, e);
1243 }
1244
1245 static int dsa_user_get_eee(struct net_device *dev, struct ethtool_eee *e)
1246 {
1247         struct dsa_port *dp = dsa_user_to_port(dev);
1248         struct dsa_switch *ds = dp->ds;
1249         int ret;
1250
1251         /* Port's PHY and MAC both need to be EEE capable */
1252         if (!dev->phydev || !dp->pl)
1253                 return -ENODEV;
1254
1255         if (!ds->ops->get_mac_eee)
1256                 return -EOPNOTSUPP;
1257
1258         ret = ds->ops->get_mac_eee(ds, dp->index, e);
1259         if (ret)
1260                 return ret;
1261
1262         return phylink_ethtool_get_eee(dp->pl, e);
1263 }
1264
1265 static int dsa_user_get_link_ksettings(struct net_device *dev,
1266                                        struct ethtool_link_ksettings *cmd)
1267 {
1268         struct dsa_port *dp = dsa_user_to_port(dev);
1269
1270         return phylink_ethtool_ksettings_get(dp->pl, cmd);
1271 }
1272
1273 static int dsa_user_set_link_ksettings(struct net_device *dev,
1274                                        const struct ethtool_link_ksettings *cmd)
1275 {
1276         struct dsa_port *dp = dsa_user_to_port(dev);
1277
1278         return phylink_ethtool_ksettings_set(dp->pl, cmd);
1279 }
1280
1281 static void dsa_user_get_pause_stats(struct net_device *dev,
1282                                      struct ethtool_pause_stats *pause_stats)
1283 {
1284         struct dsa_port *dp = dsa_user_to_port(dev);
1285         struct dsa_switch *ds = dp->ds;
1286
1287         if (ds->ops->get_pause_stats)
1288                 ds->ops->get_pause_stats(ds, dp->index, pause_stats);
1289 }
1290
1291 static void dsa_user_get_pauseparam(struct net_device *dev,
1292                                     struct ethtool_pauseparam *pause)
1293 {
1294         struct dsa_port *dp = dsa_user_to_port(dev);
1295
1296         phylink_ethtool_get_pauseparam(dp->pl, pause);
1297 }
1298
1299 static int dsa_user_set_pauseparam(struct net_device *dev,
1300                                    struct ethtool_pauseparam *pause)
1301 {
1302         struct dsa_port *dp = dsa_user_to_port(dev);
1303
1304         return phylink_ethtool_set_pauseparam(dp->pl, pause);
1305 }
1306
1307 #ifdef CONFIG_NET_POLL_CONTROLLER
1308 static int dsa_user_netpoll_setup(struct net_device *dev,
1309                                   struct netpoll_info *ni)
1310 {
1311         struct net_device *conduit = dsa_user_to_conduit(dev);
1312         struct dsa_user_priv *p = netdev_priv(dev);
1313         struct netpoll *netpoll;
1314         int err = 0;
1315
1316         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1317         if (!netpoll)
1318                 return -ENOMEM;
1319
1320         err = __netpoll_setup(netpoll, conduit);
1321         if (err) {
1322                 kfree(netpoll);
1323                 goto out;
1324         }
1325
1326         p->netpoll = netpoll;
1327 out:
1328         return err;
1329 }
1330
1331 static void dsa_user_netpoll_cleanup(struct net_device *dev)
1332 {
1333         struct dsa_user_priv *p = netdev_priv(dev);
1334         struct netpoll *netpoll = p->netpoll;
1335
1336         if (!netpoll)
1337                 return;
1338
1339         p->netpoll = NULL;
1340
1341         __netpoll_free(netpoll);
1342 }
1343
1344 static void dsa_user_poll_controller(struct net_device *dev)
1345 {
1346 }
1347 #endif
1348
1349 static struct dsa_mall_tc_entry *
1350 dsa_user_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
1351 {
1352         struct dsa_user_priv *p = netdev_priv(dev);
1353         struct dsa_mall_tc_entry *mall_tc_entry;
1354
1355         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
1356                 if (mall_tc_entry->cookie == cookie)
1357                         return mall_tc_entry;
1358
1359         return NULL;
1360 }
1361
1362 static int
1363 dsa_user_add_cls_matchall_mirred(struct net_device *dev,
1364                                  struct tc_cls_matchall_offload *cls,
1365                                  bool ingress)
1366 {
1367         struct netlink_ext_ack *extack = cls->common.extack;
1368         struct dsa_port *dp = dsa_user_to_port(dev);
1369         struct dsa_user_priv *p = netdev_priv(dev);
1370         struct dsa_mall_mirror_tc_entry *mirror;
1371         struct dsa_mall_tc_entry *mall_tc_entry;
1372         struct dsa_switch *ds = dp->ds;
1373         struct flow_action_entry *act;
1374         struct dsa_port *to_dp;
1375         int err;
1376
1377         if (!ds->ops->port_mirror_add)
1378                 return -EOPNOTSUPP;
1379
1380         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1381                                               cls->common.extack))
1382                 return -EOPNOTSUPP;
1383
1384         act = &cls->rule->action.entries[0];
1385
1386         if (!act->dev)
1387                 return -EINVAL;
1388
1389         if (!dsa_user_dev_check(act->dev))
1390                 return -EOPNOTSUPP;
1391
1392         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1393         if (!mall_tc_entry)
1394                 return -ENOMEM;
1395
1396         mall_tc_entry->cookie = cls->cookie;
1397         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1398         mirror = &mall_tc_entry->mirror;
1399
1400         to_dp = dsa_user_to_port(act->dev);
1401
1402         mirror->to_local_port = to_dp->index;
1403         mirror->ingress = ingress;
1404
1405         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress, extack);
1406         if (err) {
1407                 kfree(mall_tc_entry);
1408                 return err;
1409         }
1410
1411         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1412
1413         return err;
1414 }
1415
1416 static int
1417 dsa_user_add_cls_matchall_police(struct net_device *dev,
1418                                  struct tc_cls_matchall_offload *cls,
1419                                  bool ingress)
1420 {
1421         struct netlink_ext_ack *extack = cls->common.extack;
1422         struct dsa_port *dp = dsa_user_to_port(dev);
1423         struct dsa_user_priv *p = netdev_priv(dev);
1424         struct dsa_mall_policer_tc_entry *policer;
1425         struct dsa_mall_tc_entry *mall_tc_entry;
1426         struct dsa_switch *ds = dp->ds;
1427         struct flow_action_entry *act;
1428         int err;
1429
1430         if (!ds->ops->port_policer_add) {
1431                 NL_SET_ERR_MSG_MOD(extack,
1432                                    "Policing offload not implemented");
1433                 return -EOPNOTSUPP;
1434         }
1435
1436         if (!ingress) {
1437                 NL_SET_ERR_MSG_MOD(extack,
1438                                    "Only supported on ingress qdisc");
1439                 return -EOPNOTSUPP;
1440         }
1441
1442         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1443                                               cls->common.extack))
1444                 return -EOPNOTSUPP;
1445
1446         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1447                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1448                         NL_SET_ERR_MSG_MOD(extack,
1449                                            "Only one port policer allowed");
1450                         return -EEXIST;
1451                 }
1452         }
1453
1454         act = &cls->rule->action.entries[0];
1455
1456         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1457         if (!mall_tc_entry)
1458                 return -ENOMEM;
1459
1460         mall_tc_entry->cookie = cls->cookie;
1461         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1462         policer = &mall_tc_entry->policer;
1463         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1464         policer->burst = act->police.burst;
1465
1466         err = ds->ops->port_policer_add(ds, dp->index, policer);
1467         if (err) {
1468                 kfree(mall_tc_entry);
1469                 return err;
1470         }
1471
1472         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1473
1474         return err;
1475 }
1476
1477 static int dsa_user_add_cls_matchall(struct net_device *dev,
1478                                      struct tc_cls_matchall_offload *cls,
1479                                      bool ingress)
1480 {
1481         int err = -EOPNOTSUPP;
1482
1483         if (cls->common.protocol == htons(ETH_P_ALL) &&
1484             flow_offload_has_one_action(&cls->rule->action) &&
1485             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1486                 err = dsa_user_add_cls_matchall_mirred(dev, cls, ingress);
1487         else if (flow_offload_has_one_action(&cls->rule->action) &&
1488                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1489                 err = dsa_user_add_cls_matchall_police(dev, cls, ingress);
1490
1491         return err;
1492 }
1493
1494 static void dsa_user_del_cls_matchall(struct net_device *dev,
1495                                       struct tc_cls_matchall_offload *cls)
1496 {
1497         struct dsa_port *dp = dsa_user_to_port(dev);
1498         struct dsa_mall_tc_entry *mall_tc_entry;
1499         struct dsa_switch *ds = dp->ds;
1500
1501         mall_tc_entry = dsa_user_mall_tc_entry_find(dev, cls->cookie);
1502         if (!mall_tc_entry)
1503                 return;
1504
1505         list_del(&mall_tc_entry->list);
1506
1507         switch (mall_tc_entry->type) {
1508         case DSA_PORT_MALL_MIRROR:
1509                 if (ds->ops->port_mirror_del)
1510                         ds->ops->port_mirror_del(ds, dp->index,
1511                                                  &mall_tc_entry->mirror);
1512                 break;
1513         case DSA_PORT_MALL_POLICER:
1514                 if (ds->ops->port_policer_del)
1515                         ds->ops->port_policer_del(ds, dp->index);
1516                 break;
1517         default:
1518                 WARN_ON(1);
1519         }
1520
1521         kfree(mall_tc_entry);
1522 }
1523
1524 static int dsa_user_setup_tc_cls_matchall(struct net_device *dev,
1525                                           struct tc_cls_matchall_offload *cls,
1526                                           bool ingress)
1527 {
1528         if (cls->common.chain_index)
1529                 return -EOPNOTSUPP;
1530
1531         switch (cls->command) {
1532         case TC_CLSMATCHALL_REPLACE:
1533                 return dsa_user_add_cls_matchall(dev, cls, ingress);
1534         case TC_CLSMATCHALL_DESTROY:
1535                 dsa_user_del_cls_matchall(dev, cls);
1536                 return 0;
1537         default:
1538                 return -EOPNOTSUPP;
1539         }
1540 }
1541
1542 static int dsa_user_add_cls_flower(struct net_device *dev,
1543                                    struct flow_cls_offload *cls,
1544                                    bool ingress)
1545 {
1546         struct dsa_port *dp = dsa_user_to_port(dev);
1547         struct dsa_switch *ds = dp->ds;
1548         int port = dp->index;
1549
1550         if (!ds->ops->cls_flower_add)
1551                 return -EOPNOTSUPP;
1552
1553         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1554 }
1555
1556 static int dsa_user_del_cls_flower(struct net_device *dev,
1557                                    struct flow_cls_offload *cls,
1558                                    bool ingress)
1559 {
1560         struct dsa_port *dp = dsa_user_to_port(dev);
1561         struct dsa_switch *ds = dp->ds;
1562         int port = dp->index;
1563
1564         if (!ds->ops->cls_flower_del)
1565                 return -EOPNOTSUPP;
1566
1567         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1568 }
1569
1570 static int dsa_user_stats_cls_flower(struct net_device *dev,
1571                                      struct flow_cls_offload *cls,
1572                                      bool ingress)
1573 {
1574         struct dsa_port *dp = dsa_user_to_port(dev);
1575         struct dsa_switch *ds = dp->ds;
1576         int port = dp->index;
1577
1578         if (!ds->ops->cls_flower_stats)
1579                 return -EOPNOTSUPP;
1580
1581         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1582 }
1583
1584 static int dsa_user_setup_tc_cls_flower(struct net_device *dev,
1585                                         struct flow_cls_offload *cls,
1586                                         bool ingress)
1587 {
1588         switch (cls->command) {
1589         case FLOW_CLS_REPLACE:
1590                 return dsa_user_add_cls_flower(dev, cls, ingress);
1591         case FLOW_CLS_DESTROY:
1592                 return dsa_user_del_cls_flower(dev, cls, ingress);
1593         case FLOW_CLS_STATS:
1594                 return dsa_user_stats_cls_flower(dev, cls, ingress);
1595         default:
1596                 return -EOPNOTSUPP;
1597         }
1598 }
1599
1600 static int dsa_user_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1601                                       void *cb_priv, bool ingress)
1602 {
1603         struct net_device *dev = cb_priv;
1604
1605         if (!tc_can_offload(dev))
1606                 return -EOPNOTSUPP;
1607
1608         switch (type) {
1609         case TC_SETUP_CLSMATCHALL:
1610                 return dsa_user_setup_tc_cls_matchall(dev, type_data, ingress);
1611         case TC_SETUP_CLSFLOWER:
1612                 return dsa_user_setup_tc_cls_flower(dev, type_data, ingress);
1613         default:
1614                 return -EOPNOTSUPP;
1615         }
1616 }
1617
1618 static int dsa_user_setup_tc_block_cb_ig(enum tc_setup_type type,
1619                                          void *type_data, void *cb_priv)
1620 {
1621         return dsa_user_setup_tc_block_cb(type, type_data, cb_priv, true);
1622 }
1623
1624 static int dsa_user_setup_tc_block_cb_eg(enum tc_setup_type type,
1625                                          void *type_data, void *cb_priv)
1626 {
1627         return dsa_user_setup_tc_block_cb(type, type_data, cb_priv, false);
1628 }
1629
1630 static LIST_HEAD(dsa_user_block_cb_list);
1631
1632 static int dsa_user_setup_tc_block(struct net_device *dev,
1633                                    struct flow_block_offload *f)
1634 {
1635         struct flow_block_cb *block_cb;
1636         flow_setup_cb_t *cb;
1637
1638         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1639                 cb = dsa_user_setup_tc_block_cb_ig;
1640         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1641                 cb = dsa_user_setup_tc_block_cb_eg;
1642         else
1643                 return -EOPNOTSUPP;
1644
1645         f->driver_block_list = &dsa_user_block_cb_list;
1646
1647         switch (f->command) {
1648         case FLOW_BLOCK_BIND:
1649                 if (flow_block_cb_is_busy(cb, dev, &dsa_user_block_cb_list))
1650                         return -EBUSY;
1651
1652                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1653                 if (IS_ERR(block_cb))
1654                         return PTR_ERR(block_cb);
1655
1656                 flow_block_cb_add(block_cb, f);
1657                 list_add_tail(&block_cb->driver_list, &dsa_user_block_cb_list);
1658                 return 0;
1659         case FLOW_BLOCK_UNBIND:
1660                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1661                 if (!block_cb)
1662                         return -ENOENT;
1663
1664                 flow_block_cb_remove(block_cb, f);
1665                 list_del(&block_cb->driver_list);
1666                 return 0;
1667         default:
1668                 return -EOPNOTSUPP;
1669         }
1670 }
1671
1672 static int dsa_user_setup_ft_block(struct dsa_switch *ds, int port,
1673                                    void *type_data)
1674 {
1675         struct net_device *conduit = dsa_port_to_conduit(dsa_to_port(ds, port));
1676
1677         if (!conduit->netdev_ops->ndo_setup_tc)
1678                 return -EOPNOTSUPP;
1679
1680         return conduit->netdev_ops->ndo_setup_tc(conduit, TC_SETUP_FT, type_data);
1681 }
1682
1683 static int dsa_user_setup_tc(struct net_device *dev, enum tc_setup_type type,
1684                              void *type_data)
1685 {
1686         struct dsa_port *dp = dsa_user_to_port(dev);
1687         struct dsa_switch *ds = dp->ds;
1688
1689         switch (type) {
1690         case TC_SETUP_BLOCK:
1691                 return dsa_user_setup_tc_block(dev, type_data);
1692         case TC_SETUP_FT:
1693                 return dsa_user_setup_ft_block(ds, dp->index, type_data);
1694         default:
1695                 break;
1696         }
1697
1698         if (!ds->ops->port_setup_tc)
1699                 return -EOPNOTSUPP;
1700
1701         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1702 }
1703
1704 static int dsa_user_get_rxnfc(struct net_device *dev,
1705                               struct ethtool_rxnfc *nfc, u32 *rule_locs)
1706 {
1707         struct dsa_port *dp = dsa_user_to_port(dev);
1708         struct dsa_switch *ds = dp->ds;
1709
1710         if (!ds->ops->get_rxnfc)
1711                 return -EOPNOTSUPP;
1712
1713         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1714 }
1715
1716 static int dsa_user_set_rxnfc(struct net_device *dev,
1717                               struct ethtool_rxnfc *nfc)
1718 {
1719         struct dsa_port *dp = dsa_user_to_port(dev);
1720         struct dsa_switch *ds = dp->ds;
1721
1722         if (!ds->ops->set_rxnfc)
1723                 return -EOPNOTSUPP;
1724
1725         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1726 }
1727
1728 static int dsa_user_get_ts_info(struct net_device *dev,
1729                                 struct ethtool_ts_info *ts)
1730 {
1731         struct dsa_user_priv *p = netdev_priv(dev);
1732         struct dsa_switch *ds = p->dp->ds;
1733
1734         if (!ds->ops->get_ts_info)
1735                 return -EOPNOTSUPP;
1736
1737         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1738 }
1739
1740 static int dsa_user_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1741                                     u16 vid)
1742 {
1743         struct dsa_port *dp = dsa_user_to_port(dev);
1744         struct switchdev_obj_port_vlan vlan = {
1745                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1746                 .vid = vid,
1747                 /* This API only allows programming tagged, non-PVID VIDs */
1748                 .flags = 0,
1749         };
1750         struct netlink_ext_ack extack = {0};
1751         struct dsa_switch *ds = dp->ds;
1752         struct netdev_hw_addr *ha;
1753         struct dsa_vlan *v;
1754         int ret;
1755
1756         /* User port... */
1757         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1758         if (ret) {
1759                 if (extack._msg)
1760                         netdev_err(dev, "%s\n", extack._msg);
1761                 return ret;
1762         }
1763
1764         /* And CPU port... */
1765         ret = dsa_port_host_vlan_add(dp, &vlan, &extack);
1766         if (ret) {
1767                 if (extack._msg)
1768                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1769                                    extack._msg);
1770                 return ret;
1771         }
1772
1773         if (!dsa_switch_supports_uc_filtering(ds) &&
1774             !dsa_switch_supports_mc_filtering(ds))
1775                 return 0;
1776
1777         v = kzalloc(sizeof(*v), GFP_KERNEL);
1778         if (!v) {
1779                 ret = -ENOMEM;
1780                 goto rollback;
1781         }
1782
1783         netif_addr_lock_bh(dev);
1784
1785         v->vid = vid;
1786         list_add_tail(&v->list, &dp->user_vlans);
1787
1788         if (dsa_switch_supports_mc_filtering(ds)) {
1789                 netdev_for_each_synced_mc_addr(ha, dev) {
1790                         dsa_user_schedule_standalone_work(dev, DSA_MC_ADD,
1791                                                           ha->addr, vid);
1792                 }
1793         }
1794
1795         if (dsa_switch_supports_uc_filtering(ds)) {
1796                 netdev_for_each_synced_uc_addr(ha, dev) {
1797                         dsa_user_schedule_standalone_work(dev, DSA_UC_ADD,
1798                                                           ha->addr, vid);
1799                 }
1800         }
1801
1802         netif_addr_unlock_bh(dev);
1803
1804         dsa_flush_workqueue();
1805
1806         return 0;
1807
1808 rollback:
1809         dsa_port_host_vlan_del(dp, &vlan);
1810         dsa_port_vlan_del(dp, &vlan);
1811
1812         return ret;
1813 }
1814
1815 static int dsa_user_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1816                                      u16 vid)
1817 {
1818         struct dsa_port *dp = dsa_user_to_port(dev);
1819         struct switchdev_obj_port_vlan vlan = {
1820                 .vid = vid,
1821                 /* This API only allows programming tagged, non-PVID VIDs */
1822                 .flags = 0,
1823         };
1824         struct dsa_switch *ds = dp->ds;
1825         struct netdev_hw_addr *ha;
1826         struct dsa_vlan *v;
1827         int err;
1828
1829         err = dsa_port_vlan_del(dp, &vlan);
1830         if (err)
1831                 return err;
1832
1833         err = dsa_port_host_vlan_del(dp, &vlan);
1834         if (err)
1835                 return err;
1836
1837         if (!dsa_switch_supports_uc_filtering(ds) &&
1838             !dsa_switch_supports_mc_filtering(ds))
1839                 return 0;
1840
1841         netif_addr_lock_bh(dev);
1842
1843         v = dsa_vlan_find(&dp->user_vlans, &vlan);
1844         if (!v) {
1845                 netif_addr_unlock_bh(dev);
1846                 return -ENOENT;
1847         }
1848
1849         list_del(&v->list);
1850         kfree(v);
1851
1852         if (dsa_switch_supports_mc_filtering(ds)) {
1853                 netdev_for_each_synced_mc_addr(ha, dev) {
1854                         dsa_user_schedule_standalone_work(dev, DSA_MC_DEL,
1855                                                           ha->addr, vid);
1856                 }
1857         }
1858
1859         if (dsa_switch_supports_uc_filtering(ds)) {
1860                 netdev_for_each_synced_uc_addr(ha, dev) {
1861                         dsa_user_schedule_standalone_work(dev, DSA_UC_DEL,
1862                                                           ha->addr, vid);
1863                 }
1864         }
1865
1866         netif_addr_unlock_bh(dev);
1867
1868         dsa_flush_workqueue();
1869
1870         return 0;
1871 }
1872
1873 static int dsa_user_restore_vlan(struct net_device *vdev, int vid, void *arg)
1874 {
1875         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1876
1877         return dsa_user_vlan_rx_add_vid(arg, proto, vid);
1878 }
1879
1880 static int dsa_user_clear_vlan(struct net_device *vdev, int vid, void *arg)
1881 {
1882         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1883
1884         return dsa_user_vlan_rx_kill_vid(arg, proto, vid);
1885 }
1886
1887 /* Keep the VLAN RX filtering list in sync with the hardware only if VLAN
1888  * filtering is enabled. The baseline is that only ports that offload a
1889  * VLAN-aware bridge are VLAN-aware, and standalone ports are VLAN-unaware,
1890  * but there are exceptions for quirky hardware.
1891  *
1892  * If ds->vlan_filtering_is_global = true, then standalone ports which share
1893  * the same switch with other ports that offload a VLAN-aware bridge are also
1894  * inevitably VLAN-aware.
1895  *
1896  * To summarize, a DSA switch port offloads:
1897  *
1898  * - If standalone (this includes software bridge, software LAG):
1899  *     - if ds->needs_standalone_vlan_filtering = true, OR if
1900  *       (ds->vlan_filtering_is_global = true AND there are bridges spanning
1901  *       this switch chip which have vlan_filtering=1)
1902  *         - the 8021q upper VLANs
1903  *     - else (standalone VLAN filtering is not needed, VLAN filtering is not
1904  *       global, or it is, but no port is under a VLAN-aware bridge):
1905  *         - no VLAN (any 8021q upper is a software VLAN)
1906  *
1907  * - If under a vlan_filtering=0 bridge which it offload:
1908  *     - if ds->configure_vlan_while_not_filtering = true (default):
1909  *         - the bridge VLANs. These VLANs are committed to hardware but inactive.
1910  *     - else (deprecated):
1911  *         - no VLAN. The bridge VLANs are not restored when VLAN awareness is
1912  *           enabled, so this behavior is broken and discouraged.
1913  *
1914  * - If under a vlan_filtering=1 bridge which it offload:
1915  *     - the bridge VLANs
1916  *     - the 8021q upper VLANs
1917  */
1918 int dsa_user_manage_vlan_filtering(struct net_device *user,
1919                                    bool vlan_filtering)
1920 {
1921         int err;
1922
1923         if (vlan_filtering) {
1924                 user->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1925
1926                 err = vlan_for_each(user, dsa_user_restore_vlan, user);
1927                 if (err) {
1928                         vlan_for_each(user, dsa_user_clear_vlan, user);
1929                         user->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1930                         return err;
1931                 }
1932         } else {
1933                 err = vlan_for_each(user, dsa_user_clear_vlan, user);
1934                 if (err)
1935                         return err;
1936
1937                 user->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1938         }
1939
1940         return 0;
1941 }
1942
1943 struct dsa_hw_port {
1944         struct list_head list;
1945         struct net_device *dev;
1946         int old_mtu;
1947 };
1948
1949 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1950 {
1951         const struct dsa_hw_port *p;
1952         int err;
1953
1954         list_for_each_entry(p, hw_port_list, list) {
1955                 if (p->dev->mtu == mtu)
1956                         continue;
1957
1958                 err = dev_set_mtu(p->dev, mtu);
1959                 if (err)
1960                         goto rollback;
1961         }
1962
1963         return 0;
1964
1965 rollback:
1966         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1967                 if (p->dev->mtu == p->old_mtu)
1968                         continue;
1969
1970                 if (dev_set_mtu(p->dev, p->old_mtu))
1971                         netdev_err(p->dev, "Failed to restore MTU\n");
1972         }
1973
1974         return err;
1975 }
1976
1977 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1978 {
1979         struct dsa_hw_port *p, *n;
1980
1981         list_for_each_entry_safe(p, n, hw_port_list, list)
1982                 kfree(p);
1983 }
1984
1985 /* Make the hardware datapath to/from @dev limited to a common MTU */
1986 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1987 {
1988         struct list_head hw_port_list;
1989         struct dsa_switch_tree *dst;
1990         int min_mtu = ETH_MAX_MTU;
1991         struct dsa_port *other_dp;
1992         int err;
1993
1994         if (!dp->ds->mtu_enforcement_ingress)
1995                 return;
1996
1997         if (!dp->bridge)
1998                 return;
1999
2000         INIT_LIST_HEAD(&hw_port_list);
2001
2002         /* Populate the list of ports that are part of the same bridge
2003          * as the newly added/modified port
2004          */
2005         list_for_each_entry(dst, &dsa_tree_list, list) {
2006                 list_for_each_entry(other_dp, &dst->ports, list) {
2007                         struct dsa_hw_port *hw_port;
2008                         struct net_device *user;
2009
2010                         if (other_dp->type != DSA_PORT_TYPE_USER)
2011                                 continue;
2012
2013                         if (!dsa_port_bridge_same(dp, other_dp))
2014                                 continue;
2015
2016                         if (!other_dp->ds->mtu_enforcement_ingress)
2017                                 continue;
2018
2019                         user = other_dp->user;
2020
2021                         if (min_mtu > user->mtu)
2022                                 min_mtu = user->mtu;
2023
2024                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
2025                         if (!hw_port)
2026                                 goto out;
2027
2028                         hw_port->dev = user;
2029                         hw_port->old_mtu = user->mtu;
2030
2031                         list_add(&hw_port->list, &hw_port_list);
2032                 }
2033         }
2034
2035         /* Attempt to configure the entire hardware bridge to the newly added
2036          * interface's MTU first, regardless of whether the intention of the
2037          * user was to raise or lower it.
2038          */
2039         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->user->mtu);
2040         if (!err)
2041                 goto out;
2042
2043         /* Clearly that didn't work out so well, so just set the minimum MTU on
2044          * all hardware bridge ports now. If this fails too, then all ports will
2045          * still have their old MTU rolled back anyway.
2046          */
2047         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
2048
2049 out:
2050         dsa_hw_port_list_free(&hw_port_list);
2051 }
2052
2053 int dsa_user_change_mtu(struct net_device *dev, int new_mtu)
2054 {
2055         struct net_device *conduit = dsa_user_to_conduit(dev);
2056         struct dsa_port *dp = dsa_user_to_port(dev);
2057         struct dsa_port *cpu_dp = dp->cpu_dp;
2058         struct dsa_switch *ds = dp->ds;
2059         struct dsa_port *other_dp;
2060         int largest_mtu = 0;
2061         int new_conduit_mtu;
2062         int old_conduit_mtu;
2063         int mtu_limit;
2064         int overhead;
2065         int cpu_mtu;
2066         int err;
2067
2068         if (!ds->ops->port_change_mtu)
2069                 return -EOPNOTSUPP;
2070
2071         dsa_tree_for_each_user_port(other_dp, ds->dst) {
2072                 int user_mtu;
2073
2074                 /* During probe, this function will be called for each user
2075                  * device, while not all of them have been allocated. That's
2076                  * ok, it doesn't change what the maximum is, so ignore it.
2077                  */
2078                 if (!other_dp->user)
2079                         continue;
2080
2081                 /* Pretend that we already applied the setting, which we
2082                  * actually haven't (still haven't done all integrity checks)
2083                  */
2084                 if (dp == other_dp)
2085                         user_mtu = new_mtu;
2086                 else
2087                         user_mtu = other_dp->user->mtu;
2088
2089                 if (largest_mtu < user_mtu)
2090                         largest_mtu = user_mtu;
2091         }
2092
2093         overhead = dsa_tag_protocol_overhead(cpu_dp->tag_ops);
2094         mtu_limit = min_t(int, conduit->max_mtu, dev->max_mtu + overhead);
2095         old_conduit_mtu = conduit->mtu;
2096         new_conduit_mtu = largest_mtu + overhead;
2097         if (new_conduit_mtu > mtu_limit)
2098                 return -ERANGE;
2099
2100         /* If the conduit MTU isn't over limit, there's no need to check the CPU
2101          * MTU, since that surely isn't either.
2102          */
2103         cpu_mtu = largest_mtu;
2104
2105         /* Start applying stuff */
2106         if (new_conduit_mtu != old_conduit_mtu) {
2107                 err = dev_set_mtu(conduit, new_conduit_mtu);
2108                 if (err < 0)
2109                         goto out_conduit_failed;
2110
2111                 /* We only need to propagate the MTU of the CPU port to
2112                  * upstream switches, so emit a notifier which updates them.
2113                  */
2114                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu);
2115                 if (err)
2116                         goto out_cpu_failed;
2117         }
2118
2119         err = ds->ops->port_change_mtu(ds, dp->index, new_mtu);
2120         if (err)
2121                 goto out_port_failed;
2122
2123         dev->mtu = new_mtu;
2124
2125         dsa_bridge_mtu_normalization(dp);
2126
2127         return 0;
2128
2129 out_port_failed:
2130         if (new_conduit_mtu != old_conduit_mtu)
2131                 dsa_port_mtu_change(cpu_dp, old_conduit_mtu - overhead);
2132 out_cpu_failed:
2133         if (new_conduit_mtu != old_conduit_mtu)
2134                 dev_set_mtu(conduit, old_conduit_mtu);
2135 out_conduit_failed:
2136         return err;
2137 }
2138
2139 static int __maybe_unused
2140 dsa_user_dcbnl_set_default_prio(struct net_device *dev, struct dcb_app *app)
2141 {
2142         struct dsa_port *dp = dsa_user_to_port(dev);
2143         struct dsa_switch *ds = dp->ds;
2144         unsigned long mask, new_prio;
2145         int err, port = dp->index;
2146
2147         if (!ds->ops->port_set_default_prio)
2148                 return -EOPNOTSUPP;
2149
2150         err = dcb_ieee_setapp(dev, app);
2151         if (err)
2152                 return err;
2153
2154         mask = dcb_ieee_getapp_mask(dev, app);
2155         new_prio = __fls(mask);
2156
2157         err = ds->ops->port_set_default_prio(ds, port, new_prio);
2158         if (err) {
2159                 dcb_ieee_delapp(dev, app);
2160                 return err;
2161         }
2162
2163         return 0;
2164 }
2165
2166 static int __maybe_unused
2167 dsa_user_dcbnl_add_dscp_prio(struct net_device *dev, struct dcb_app *app)
2168 {
2169         struct dsa_port *dp = dsa_user_to_port(dev);
2170         struct dsa_switch *ds = dp->ds;
2171         unsigned long mask, new_prio;
2172         int err, port = dp->index;
2173         u8 dscp = app->protocol;
2174
2175         if (!ds->ops->port_add_dscp_prio)
2176                 return -EOPNOTSUPP;
2177
2178         if (dscp >= 64) {
2179                 netdev_err(dev, "DSCP APP entry with protocol value %u is invalid\n",
2180                            dscp);
2181                 return -EINVAL;
2182         }
2183
2184         err = dcb_ieee_setapp(dev, app);
2185         if (err)
2186                 return err;
2187
2188         mask = dcb_ieee_getapp_mask(dev, app);
2189         new_prio = __fls(mask);
2190
2191         err = ds->ops->port_add_dscp_prio(ds, port, dscp, new_prio);
2192         if (err) {
2193                 dcb_ieee_delapp(dev, app);
2194                 return err;
2195         }
2196
2197         return 0;
2198 }
2199
2200 static int __maybe_unused dsa_user_dcbnl_ieee_setapp(struct net_device *dev,
2201                                                      struct dcb_app *app)
2202 {
2203         switch (app->selector) {
2204         case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
2205                 switch (app->protocol) {
2206                 case 0:
2207                         return dsa_user_dcbnl_set_default_prio(dev, app);
2208                 default:
2209                         return -EOPNOTSUPP;
2210                 }
2211                 break;
2212         case IEEE_8021QAZ_APP_SEL_DSCP:
2213                 return dsa_user_dcbnl_add_dscp_prio(dev, app);
2214         default:
2215                 return -EOPNOTSUPP;
2216         }
2217 }
2218
2219 static int __maybe_unused
2220 dsa_user_dcbnl_del_default_prio(struct net_device *dev, struct dcb_app *app)
2221 {
2222         struct dsa_port *dp = dsa_user_to_port(dev);
2223         struct dsa_switch *ds = dp->ds;
2224         unsigned long mask, new_prio;
2225         int err, port = dp->index;
2226
2227         if (!ds->ops->port_set_default_prio)
2228                 return -EOPNOTSUPP;
2229
2230         err = dcb_ieee_delapp(dev, app);
2231         if (err)
2232                 return err;
2233
2234         mask = dcb_ieee_getapp_mask(dev, app);
2235         new_prio = mask ? __fls(mask) : 0;
2236
2237         err = ds->ops->port_set_default_prio(ds, port, new_prio);
2238         if (err) {
2239                 dcb_ieee_setapp(dev, app);
2240                 return err;
2241         }
2242
2243         return 0;
2244 }
2245
2246 static int __maybe_unused
2247 dsa_user_dcbnl_del_dscp_prio(struct net_device *dev, struct dcb_app *app)
2248 {
2249         struct dsa_port *dp = dsa_user_to_port(dev);
2250         struct dsa_switch *ds = dp->ds;
2251         int err, port = dp->index;
2252         u8 dscp = app->protocol;
2253
2254         if (!ds->ops->port_del_dscp_prio)
2255                 return -EOPNOTSUPP;
2256
2257         err = dcb_ieee_delapp(dev, app);
2258         if (err)
2259                 return err;
2260
2261         err = ds->ops->port_del_dscp_prio(ds, port, dscp, app->priority);
2262         if (err) {
2263                 dcb_ieee_setapp(dev, app);
2264                 return err;
2265         }
2266
2267         return 0;
2268 }
2269
2270 static int __maybe_unused dsa_user_dcbnl_ieee_delapp(struct net_device *dev,
2271                                                      struct dcb_app *app)
2272 {
2273         switch (app->selector) {
2274         case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
2275                 switch (app->protocol) {
2276                 case 0:
2277                         return dsa_user_dcbnl_del_default_prio(dev, app);
2278                 default:
2279                         return -EOPNOTSUPP;
2280                 }
2281                 break;
2282         case IEEE_8021QAZ_APP_SEL_DSCP:
2283                 return dsa_user_dcbnl_del_dscp_prio(dev, app);
2284         default:
2285                 return -EOPNOTSUPP;
2286         }
2287 }
2288
2289 /* Pre-populate the DCB application priority table with the priorities
2290  * configured during switch setup, which we read from hardware here.
2291  */
2292 static int dsa_user_dcbnl_init(struct net_device *dev)
2293 {
2294         struct dsa_port *dp = dsa_user_to_port(dev);
2295         struct dsa_switch *ds = dp->ds;
2296         int port = dp->index;
2297         int err;
2298
2299         if (ds->ops->port_get_default_prio) {
2300                 int prio = ds->ops->port_get_default_prio(ds, port);
2301                 struct dcb_app app = {
2302                         .selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE,
2303                         .protocol = 0,
2304                         .priority = prio,
2305                 };
2306
2307                 if (prio < 0)
2308                         return prio;
2309
2310                 err = dcb_ieee_setapp(dev, &app);
2311                 if (err)
2312                         return err;
2313         }
2314
2315         if (ds->ops->port_get_dscp_prio) {
2316                 int protocol;
2317
2318                 for (protocol = 0; protocol < 64; protocol++) {
2319                         struct dcb_app app = {
2320                                 .selector = IEEE_8021QAZ_APP_SEL_DSCP,
2321                                 .protocol = protocol,
2322                         };
2323                         int prio;
2324
2325                         prio = ds->ops->port_get_dscp_prio(ds, port, protocol);
2326                         if (prio == -EOPNOTSUPP)
2327                                 continue;
2328                         if (prio < 0)
2329                                 return prio;
2330
2331                         app.priority = prio;
2332
2333                         err = dcb_ieee_setapp(dev, &app);
2334                         if (err)
2335                                 return err;
2336                 }
2337         }
2338
2339         return 0;
2340 }
2341
2342 static const struct ethtool_ops dsa_user_ethtool_ops = {
2343         .get_drvinfo            = dsa_user_get_drvinfo,
2344         .get_regs_len           = dsa_user_get_regs_len,
2345         .get_regs               = dsa_user_get_regs,
2346         .nway_reset             = dsa_user_nway_reset,
2347         .get_link               = ethtool_op_get_link,
2348         .get_eeprom_len         = dsa_user_get_eeprom_len,
2349         .get_eeprom             = dsa_user_get_eeprom,
2350         .set_eeprom             = dsa_user_set_eeprom,
2351         .get_strings            = dsa_user_get_strings,
2352         .get_ethtool_stats      = dsa_user_get_ethtool_stats,
2353         .get_sset_count         = dsa_user_get_sset_count,
2354         .get_eth_phy_stats      = dsa_user_get_eth_phy_stats,
2355         .get_eth_mac_stats      = dsa_user_get_eth_mac_stats,
2356         .get_eth_ctrl_stats     = dsa_user_get_eth_ctrl_stats,
2357         .get_rmon_stats         = dsa_user_get_rmon_stats,
2358         .set_wol                = dsa_user_set_wol,
2359         .get_wol                = dsa_user_get_wol,
2360         .set_eee                = dsa_user_set_eee,
2361         .get_eee                = dsa_user_get_eee,
2362         .get_link_ksettings     = dsa_user_get_link_ksettings,
2363         .set_link_ksettings     = dsa_user_set_link_ksettings,
2364         .get_pause_stats        = dsa_user_get_pause_stats,
2365         .get_pauseparam         = dsa_user_get_pauseparam,
2366         .set_pauseparam         = dsa_user_set_pauseparam,
2367         .get_rxnfc              = dsa_user_get_rxnfc,
2368         .set_rxnfc              = dsa_user_set_rxnfc,
2369         .get_ts_info            = dsa_user_get_ts_info,
2370         .self_test              = dsa_user_net_selftest,
2371         .get_mm                 = dsa_user_get_mm,
2372         .set_mm                 = dsa_user_set_mm,
2373         .get_mm_stats           = dsa_user_get_mm_stats,
2374 };
2375
2376 static const struct dcbnl_rtnl_ops __maybe_unused dsa_user_dcbnl_ops = {
2377         .ieee_setapp            = dsa_user_dcbnl_ieee_setapp,
2378         .ieee_delapp            = dsa_user_dcbnl_ieee_delapp,
2379 };
2380
2381 static void dsa_user_get_stats64(struct net_device *dev,
2382                                  struct rtnl_link_stats64 *s)
2383 {
2384         struct dsa_port *dp = dsa_user_to_port(dev);
2385         struct dsa_switch *ds = dp->ds;
2386
2387         if (ds->ops->get_stats64)
2388                 ds->ops->get_stats64(ds, dp->index, s);
2389         else
2390                 dev_get_tstats64(dev, s);
2391 }
2392
2393 static int dsa_user_fill_forward_path(struct net_device_path_ctx *ctx,
2394                                       struct net_device_path *path)
2395 {
2396         struct dsa_port *dp = dsa_user_to_port(ctx->dev);
2397         struct net_device *conduit = dsa_port_to_conduit(dp);
2398         struct dsa_port *cpu_dp = dp->cpu_dp;
2399
2400         path->dev = ctx->dev;
2401         path->type = DEV_PATH_DSA;
2402         path->dsa.proto = cpu_dp->tag_ops->proto;
2403         path->dsa.port = dp->index;
2404         ctx->dev = conduit;
2405
2406         return 0;
2407 }
2408
2409 static const struct net_device_ops dsa_user_netdev_ops = {
2410         .ndo_open               = dsa_user_open,
2411         .ndo_stop               = dsa_user_close,
2412         .ndo_start_xmit         = dsa_user_xmit,
2413         .ndo_change_rx_flags    = dsa_user_change_rx_flags,
2414         .ndo_set_rx_mode        = dsa_user_set_rx_mode,
2415         .ndo_set_mac_address    = dsa_user_set_mac_address,
2416         .ndo_fdb_dump           = dsa_user_fdb_dump,
2417         .ndo_eth_ioctl          = dsa_user_ioctl,
2418         .ndo_get_iflink         = dsa_user_get_iflink,
2419 #ifdef CONFIG_NET_POLL_CONTROLLER
2420         .ndo_netpoll_setup      = dsa_user_netpoll_setup,
2421         .ndo_netpoll_cleanup    = dsa_user_netpoll_cleanup,
2422         .ndo_poll_controller    = dsa_user_poll_controller,
2423 #endif
2424         .ndo_setup_tc           = dsa_user_setup_tc,
2425         .ndo_get_stats64        = dsa_user_get_stats64,
2426         .ndo_vlan_rx_add_vid    = dsa_user_vlan_rx_add_vid,
2427         .ndo_vlan_rx_kill_vid   = dsa_user_vlan_rx_kill_vid,
2428         .ndo_change_mtu         = dsa_user_change_mtu,
2429         .ndo_fill_forward_path  = dsa_user_fill_forward_path,
2430 };
2431
2432 static struct device_type dsa_type = {
2433         .name   = "dsa",
2434 };
2435
2436 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
2437 {
2438         const struct dsa_port *dp = dsa_to_port(ds, port);
2439
2440         if (dp->pl)
2441                 phylink_mac_change(dp->pl, up);
2442 }
2443 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
2444
2445 static void dsa_user_phylink_fixed_state(struct phylink_config *config,
2446                                          struct phylink_link_state *state)
2447 {
2448         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
2449         struct dsa_switch *ds = dp->ds;
2450
2451         /* No need to check that this operation is valid, the callback would
2452          * not be called if it was not.
2453          */
2454         ds->ops->phylink_fixed_state(ds, dp->index, state);
2455 }
2456
2457 /* user device setup *******************************************************/
2458 static int dsa_user_phy_connect(struct net_device *user_dev, int addr,
2459                                 u32 flags)
2460 {
2461         struct dsa_port *dp = dsa_user_to_port(user_dev);
2462         struct dsa_switch *ds = dp->ds;
2463
2464         user_dev->phydev = mdiobus_get_phy(ds->user_mii_bus, addr);
2465         if (!user_dev->phydev) {
2466                 netdev_err(user_dev, "no phy at %d\n", addr);
2467                 return -ENODEV;
2468         }
2469
2470         user_dev->phydev->dev_flags |= flags;
2471
2472         return phylink_connect_phy(dp->pl, user_dev->phydev);
2473 }
2474
2475 static int dsa_user_phy_setup(struct net_device *user_dev)
2476 {
2477         struct dsa_port *dp = dsa_user_to_port(user_dev);
2478         struct device_node *port_dn = dp->dn;
2479         struct dsa_switch *ds = dp->ds;
2480         u32 phy_flags = 0;
2481         int ret;
2482
2483         dp->pl_config.dev = &user_dev->dev;
2484         dp->pl_config.type = PHYLINK_NETDEV;
2485
2486         /* The get_fixed_state callback takes precedence over polling the
2487          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
2488          * this if the switch provides such a callback.
2489          */
2490         if (ds->ops->phylink_fixed_state) {
2491                 dp->pl_config.get_fixed_state = dsa_user_phylink_fixed_state;
2492                 dp->pl_config.poll_fixed_state = true;
2493         }
2494
2495         ret = dsa_port_phylink_create(dp);
2496         if (ret)
2497                 return ret;
2498
2499         if (ds->ops->get_phy_flags)
2500                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
2501
2502         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
2503         if (ret == -ENODEV && ds->user_mii_bus) {
2504                 /* We could not connect to a designated PHY or SFP, so try to
2505                  * use the switch internal MDIO bus instead
2506                  */
2507                 ret = dsa_user_phy_connect(user_dev, dp->index, phy_flags);
2508         }
2509         if (ret) {
2510                 netdev_err(user_dev, "failed to connect to PHY: %pe\n",
2511                            ERR_PTR(ret));
2512                 dsa_port_phylink_destroy(dp);
2513         }
2514
2515         return ret;
2516 }
2517
2518 void dsa_user_setup_tagger(struct net_device *user)
2519 {
2520         struct dsa_port *dp = dsa_user_to_port(user);
2521         struct net_device *conduit = dsa_port_to_conduit(dp);
2522         struct dsa_user_priv *p = netdev_priv(user);
2523         const struct dsa_port *cpu_dp = dp->cpu_dp;
2524         const struct dsa_switch *ds = dp->ds;
2525
2526         user->needed_headroom = cpu_dp->tag_ops->needed_headroom;
2527         user->needed_tailroom = cpu_dp->tag_ops->needed_tailroom;
2528         /* Try to save one extra realloc later in the TX path (in the conduit)
2529          * by also inheriting the conduit's needed headroom and tailroom.
2530          * The 8021q driver also does this.
2531          */
2532         user->needed_headroom += conduit->needed_headroom;
2533         user->needed_tailroom += conduit->needed_tailroom;
2534
2535         p->xmit = cpu_dp->tag_ops->xmit;
2536
2537         user->features = conduit->vlan_features | NETIF_F_HW_TC;
2538         user->hw_features |= NETIF_F_HW_TC;
2539         user->features |= NETIF_F_LLTX;
2540         if (user->needed_tailroom)
2541                 user->features &= ~(NETIF_F_SG | NETIF_F_FRAGLIST);
2542         if (ds->needs_standalone_vlan_filtering)
2543                 user->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2544 }
2545
2546 int dsa_user_suspend(struct net_device *user_dev)
2547 {
2548         struct dsa_port *dp = dsa_user_to_port(user_dev);
2549
2550         if (!netif_running(user_dev))
2551                 return 0;
2552
2553         netif_device_detach(user_dev);
2554
2555         rtnl_lock();
2556         phylink_stop(dp->pl);
2557         rtnl_unlock();
2558
2559         return 0;
2560 }
2561
2562 int dsa_user_resume(struct net_device *user_dev)
2563 {
2564         struct dsa_port *dp = dsa_user_to_port(user_dev);
2565
2566         if (!netif_running(user_dev))
2567                 return 0;
2568
2569         netif_device_attach(user_dev);
2570
2571         rtnl_lock();
2572         phylink_start(dp->pl);
2573         rtnl_unlock();
2574
2575         return 0;
2576 }
2577
2578 int dsa_user_create(struct dsa_port *port)
2579 {
2580         struct net_device *conduit = dsa_port_to_conduit(port);
2581         struct dsa_switch *ds = port->ds;
2582         struct net_device *user_dev;
2583         struct dsa_user_priv *p;
2584         const char *name;
2585         int assign_type;
2586         int ret;
2587
2588         if (!ds->num_tx_queues)
2589                 ds->num_tx_queues = 1;
2590
2591         if (port->name) {
2592                 name = port->name;
2593                 assign_type = NET_NAME_PREDICTABLE;
2594         } else {
2595                 name = "eth%d";
2596                 assign_type = NET_NAME_ENUM;
2597         }
2598
2599         user_dev = alloc_netdev_mqs(sizeof(struct dsa_user_priv), name,
2600                                     assign_type, ether_setup,
2601                                     ds->num_tx_queues, 1);
2602         if (user_dev == NULL)
2603                 return -ENOMEM;
2604
2605         user_dev->rtnl_link_ops = &dsa_link_ops;
2606         user_dev->ethtool_ops = &dsa_user_ethtool_ops;
2607 #if IS_ENABLED(CONFIG_DCB)
2608         user_dev->dcbnl_ops = &dsa_user_dcbnl_ops;
2609 #endif
2610         if (!is_zero_ether_addr(port->mac))
2611                 eth_hw_addr_set(user_dev, port->mac);
2612         else
2613                 eth_hw_addr_inherit(user_dev, conduit);
2614         user_dev->priv_flags |= IFF_NO_QUEUE;
2615         if (dsa_switch_supports_uc_filtering(ds))
2616                 user_dev->priv_flags |= IFF_UNICAST_FLT;
2617         user_dev->netdev_ops = &dsa_user_netdev_ops;
2618         if (ds->ops->port_max_mtu)
2619                 user_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
2620         SET_NETDEV_DEVTYPE(user_dev, &dsa_type);
2621
2622         SET_NETDEV_DEV(user_dev, port->ds->dev);
2623         SET_NETDEV_DEVLINK_PORT(user_dev, &port->devlink_port);
2624         user_dev->dev.of_node = port->dn;
2625         user_dev->vlan_features = conduit->vlan_features;
2626
2627         p = netdev_priv(user_dev);
2628         user_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2629         if (!user_dev->tstats) {
2630                 free_netdev(user_dev);
2631                 return -ENOMEM;
2632         }
2633
2634         ret = gro_cells_init(&p->gcells, user_dev);
2635         if (ret)
2636                 goto out_free;
2637
2638         p->dp = port;
2639         INIT_LIST_HEAD(&p->mall_tc_list);
2640         port->user = user_dev;
2641         dsa_user_setup_tagger(user_dev);
2642
2643         netif_carrier_off(user_dev);
2644
2645         ret = dsa_user_phy_setup(user_dev);
2646         if (ret) {
2647                 netdev_err(user_dev,
2648                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
2649                            ret, ds->dst->index, ds->index, port->index);
2650                 goto out_gcells;
2651         }
2652
2653         rtnl_lock();
2654
2655         ret = dsa_user_change_mtu(user_dev, ETH_DATA_LEN);
2656         if (ret && ret != -EOPNOTSUPP)
2657                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
2658                          ret, ETH_DATA_LEN, port->index);
2659
2660         ret = register_netdevice(user_dev);
2661         if (ret) {
2662                 netdev_err(conduit, "error %d registering interface %s\n",
2663                            ret, user_dev->name);
2664                 rtnl_unlock();
2665                 goto out_phy;
2666         }
2667
2668         if (IS_ENABLED(CONFIG_DCB)) {
2669                 ret = dsa_user_dcbnl_init(user_dev);
2670                 if (ret) {
2671                         netdev_err(user_dev,
2672                                    "failed to initialize DCB: %pe\n",
2673                                    ERR_PTR(ret));
2674                         rtnl_unlock();
2675                         goto out_unregister;
2676                 }
2677         }
2678
2679         ret = netdev_upper_dev_link(conduit, user_dev, NULL);
2680
2681         rtnl_unlock();
2682
2683         if (ret)
2684                 goto out_unregister;
2685
2686         return 0;
2687
2688 out_unregister:
2689         unregister_netdev(user_dev);
2690 out_phy:
2691         rtnl_lock();
2692         phylink_disconnect_phy(p->dp->pl);
2693         rtnl_unlock();
2694         dsa_port_phylink_destroy(p->dp);
2695 out_gcells:
2696         gro_cells_destroy(&p->gcells);
2697 out_free:
2698         free_percpu(user_dev->tstats);
2699         free_netdev(user_dev);
2700         port->user = NULL;
2701         return ret;
2702 }
2703
2704 void dsa_user_destroy(struct net_device *user_dev)
2705 {
2706         struct net_device *conduit = dsa_user_to_conduit(user_dev);
2707         struct dsa_port *dp = dsa_user_to_port(user_dev);
2708         struct dsa_user_priv *p = netdev_priv(user_dev);
2709
2710         netif_carrier_off(user_dev);
2711         rtnl_lock();
2712         netdev_upper_dev_unlink(conduit, user_dev);
2713         unregister_netdevice(user_dev);
2714         phylink_disconnect_phy(dp->pl);
2715         rtnl_unlock();
2716
2717         dsa_port_phylink_destroy(dp);
2718         gro_cells_destroy(&p->gcells);
2719         free_percpu(user_dev->tstats);
2720         free_netdev(user_dev);
2721 }
2722
2723 int dsa_user_change_conduit(struct net_device *dev, struct net_device *conduit,
2724                             struct netlink_ext_ack *extack)
2725 {
2726         struct net_device *old_conduit = dsa_user_to_conduit(dev);
2727         struct dsa_port *dp = dsa_user_to_port(dev);
2728         struct dsa_switch *ds = dp->ds;
2729         struct net_device *upper;
2730         struct list_head *iter;
2731         int err;
2732
2733         if (conduit == old_conduit)
2734                 return 0;
2735
2736         if (!ds->ops->port_change_conduit) {
2737                 NL_SET_ERR_MSG_MOD(extack,
2738                                    "Driver does not support changing DSA conduit");
2739                 return -EOPNOTSUPP;
2740         }
2741
2742         if (!netdev_uses_dsa(conduit)) {
2743                 NL_SET_ERR_MSG_MOD(extack,
2744                                    "Interface not eligible as DSA conduit");
2745                 return -EOPNOTSUPP;
2746         }
2747
2748         netdev_for_each_upper_dev_rcu(conduit, upper, iter) {
2749                 if (dsa_user_dev_check(upper))
2750                         continue;
2751                 if (netif_is_bridge_master(upper))
2752                         continue;
2753                 NL_SET_ERR_MSG_MOD(extack, "Cannot join conduit with unknown uppers");
2754                 return -EOPNOTSUPP;
2755         }
2756
2757         /* Since we allow live-changing the DSA conduit, plus we auto-open the
2758          * DSA conduit when the user port opens => we need to ensure that the
2759          * new DSA conduit is open too.
2760          */
2761         if (dev->flags & IFF_UP) {
2762                 err = dev_open(conduit, extack);
2763                 if (err)
2764                         return err;
2765         }
2766
2767         netdev_upper_dev_unlink(old_conduit, dev);
2768
2769         err = netdev_upper_dev_link(conduit, dev, extack);
2770         if (err)
2771                 goto out_revert_old_conduit_unlink;
2772
2773         err = dsa_port_change_conduit(dp, conduit, extack);
2774         if (err)
2775                 goto out_revert_conduit_link;
2776
2777         /* Update the MTU of the new CPU port through cross-chip notifiers */
2778         err = dsa_user_change_mtu(dev, dev->mtu);
2779         if (err && err != -EOPNOTSUPP) {
2780                 netdev_warn(dev,
2781                             "nonfatal error updating MTU with new conduit: %pe\n",
2782                             ERR_PTR(err));
2783         }
2784
2785         /* If the port doesn't have its own MAC address and relies on the DSA
2786          * conduit's one, inherit it again from the new DSA conduit.
2787          */
2788         if (is_zero_ether_addr(dp->mac))
2789                 eth_hw_addr_inherit(dev, conduit);
2790
2791         return 0;
2792
2793 out_revert_conduit_link:
2794         netdev_upper_dev_unlink(conduit, dev);
2795 out_revert_old_conduit_unlink:
2796         netdev_upper_dev_link(old_conduit, dev, NULL);
2797         return err;
2798 }
2799
2800 bool dsa_user_dev_check(const struct net_device *dev)
2801 {
2802         return dev->netdev_ops == &dsa_user_netdev_ops;
2803 }
2804 EXPORT_SYMBOL_GPL(dsa_user_dev_check);
2805
2806 static int dsa_user_changeupper(struct net_device *dev,
2807                                 struct netdev_notifier_changeupper_info *info)
2808 {
2809         struct netlink_ext_ack *extack;
2810         int err = NOTIFY_DONE;
2811         struct dsa_port *dp;
2812
2813         if (!dsa_user_dev_check(dev))
2814                 return err;
2815
2816         dp = dsa_user_to_port(dev);
2817         extack = netdev_notifier_info_to_extack(&info->info);
2818
2819         if (netif_is_bridge_master(info->upper_dev)) {
2820                 if (info->linking) {
2821                         err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2822                         if (!err)
2823                                 dsa_bridge_mtu_normalization(dp);
2824                         if (err == -EOPNOTSUPP) {
2825                                 NL_SET_ERR_MSG_WEAK_MOD(extack,
2826                                                         "Offloading not supported");
2827                                 err = 0;
2828                         }
2829                         err = notifier_from_errno(err);
2830                 } else {
2831                         dsa_port_bridge_leave(dp, info->upper_dev);
2832                         err = NOTIFY_OK;
2833                 }
2834         } else if (netif_is_lag_master(info->upper_dev)) {
2835                 if (info->linking) {
2836                         err = dsa_port_lag_join(dp, info->upper_dev,
2837                                                 info->upper_info, extack);
2838                         if (err == -EOPNOTSUPP) {
2839                                 NL_SET_ERR_MSG_WEAK_MOD(extack,
2840                                                         "Offloading not supported");
2841                                 err = 0;
2842                         }
2843                         err = notifier_from_errno(err);
2844                 } else {
2845                         dsa_port_lag_leave(dp, info->upper_dev);
2846                         err = NOTIFY_OK;
2847                 }
2848         } else if (is_hsr_master(info->upper_dev)) {
2849                 if (info->linking) {
2850                         err = dsa_port_hsr_join(dp, info->upper_dev, extack);
2851                         if (err == -EOPNOTSUPP) {
2852                                 NL_SET_ERR_MSG_WEAK_MOD(extack,
2853                                                         "Offloading not supported");
2854                                 err = 0;
2855                         }
2856                         err = notifier_from_errno(err);
2857                 } else {
2858                         dsa_port_hsr_leave(dp, info->upper_dev);
2859                         err = NOTIFY_OK;
2860                 }
2861         }
2862
2863         return err;
2864 }
2865
2866 static int dsa_user_prechangeupper(struct net_device *dev,
2867                                    struct netdev_notifier_changeupper_info *info)
2868 {
2869         struct dsa_port *dp;
2870
2871         if (!dsa_user_dev_check(dev))
2872                 return NOTIFY_DONE;
2873
2874         dp = dsa_user_to_port(dev);
2875
2876         if (netif_is_bridge_master(info->upper_dev) && !info->linking)
2877                 dsa_port_pre_bridge_leave(dp, info->upper_dev);
2878         else if (netif_is_lag_master(info->upper_dev) && !info->linking)
2879                 dsa_port_pre_lag_leave(dp, info->upper_dev);
2880         /* dsa_port_pre_hsr_leave is not yet necessary since hsr devices cannot
2881          * meaningfully placed under a bridge yet
2882          */
2883
2884         return NOTIFY_DONE;
2885 }
2886
2887 static int
2888 dsa_user_lag_changeupper(struct net_device *dev,
2889                          struct netdev_notifier_changeupper_info *info)
2890 {
2891         struct net_device *lower;
2892         struct list_head *iter;
2893         int err = NOTIFY_DONE;
2894         struct dsa_port *dp;
2895
2896         if (!netif_is_lag_master(dev))
2897                 return err;
2898
2899         netdev_for_each_lower_dev(dev, lower, iter) {
2900                 if (!dsa_user_dev_check(lower))
2901                         continue;
2902
2903                 dp = dsa_user_to_port(lower);
2904                 if (!dp->lag)
2905                         /* Software LAG */
2906                         continue;
2907
2908                 err = dsa_user_changeupper(lower, info);
2909                 if (notifier_to_errno(err))
2910                         break;
2911         }
2912
2913         return err;
2914 }
2915
2916 /* Same as dsa_user_lag_changeupper() except that it calls
2917  * dsa_user_prechangeupper()
2918  */
2919 static int
2920 dsa_user_lag_prechangeupper(struct net_device *dev,
2921                             struct netdev_notifier_changeupper_info *info)
2922 {
2923         struct net_device *lower;
2924         struct list_head *iter;
2925         int err = NOTIFY_DONE;
2926         struct dsa_port *dp;
2927
2928         if (!netif_is_lag_master(dev))
2929                 return err;
2930
2931         netdev_for_each_lower_dev(dev, lower, iter) {
2932                 if (!dsa_user_dev_check(lower))
2933                         continue;
2934
2935                 dp = dsa_user_to_port(lower);
2936                 if (!dp->lag)
2937                         /* Software LAG */
2938                         continue;
2939
2940                 err = dsa_user_prechangeupper(lower, info);
2941                 if (notifier_to_errno(err))
2942                         break;
2943         }
2944
2945         return err;
2946 }
2947
2948 static int
2949 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2950                                  struct netdev_notifier_changeupper_info *info)
2951 {
2952         struct netlink_ext_ack *ext_ack;
2953         struct net_device *user, *br;
2954         struct dsa_port *dp;
2955
2956         ext_ack = netdev_notifier_info_to_extack(&info->info);
2957
2958         if (!is_vlan_dev(dev))
2959                 return NOTIFY_DONE;
2960
2961         user = vlan_dev_real_dev(dev);
2962         if (!dsa_user_dev_check(user))
2963                 return NOTIFY_DONE;
2964
2965         dp = dsa_user_to_port(user);
2966         br = dsa_port_bridge_dev_get(dp);
2967         if (!br)
2968                 return NOTIFY_DONE;
2969
2970         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2971         if (br_vlan_enabled(br) &&
2972             netif_is_bridge_master(info->upper_dev) && info->linking) {
2973                 NL_SET_ERR_MSG_MOD(ext_ack,
2974                                    "Cannot make VLAN device join VLAN-aware bridge");
2975                 return notifier_from_errno(-EINVAL);
2976         }
2977
2978         return NOTIFY_DONE;
2979 }
2980
2981 static int
2982 dsa_user_check_8021q_upper(struct net_device *dev,
2983                            struct netdev_notifier_changeupper_info *info)
2984 {
2985         struct dsa_port *dp = dsa_user_to_port(dev);
2986         struct net_device *br = dsa_port_bridge_dev_get(dp);
2987         struct bridge_vlan_info br_info;
2988         struct netlink_ext_ack *extack;
2989         int err = NOTIFY_DONE;
2990         u16 vid;
2991
2992         if (!br || !br_vlan_enabled(br))
2993                 return NOTIFY_DONE;
2994
2995         extack = netdev_notifier_info_to_extack(&info->info);
2996         vid = vlan_dev_vlan_id(info->upper_dev);
2997
2998         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2999          * device, respectively the VID is not found, returning
3000          * 0 means success, which is a failure for us here.
3001          */
3002         err = br_vlan_get_info(br, vid, &br_info);
3003         if (err == 0) {
3004                 NL_SET_ERR_MSG_MOD(extack,
3005                                    "This VLAN is already configured by the bridge");
3006                 return notifier_from_errno(-EBUSY);
3007         }
3008
3009         return NOTIFY_DONE;
3010 }
3011
3012 static int
3013 dsa_user_prechangeupper_sanity_check(struct net_device *dev,
3014                                      struct netdev_notifier_changeupper_info *info)
3015 {
3016         struct dsa_switch *ds;
3017         struct dsa_port *dp;
3018         int err;
3019
3020         if (!dsa_user_dev_check(dev))
3021                 return dsa_prevent_bridging_8021q_upper(dev, info);
3022
3023         dp = dsa_user_to_port(dev);
3024         ds = dp->ds;
3025
3026         if (ds->ops->port_prechangeupper) {
3027                 err = ds->ops->port_prechangeupper(ds, dp->index, info);
3028                 if (err)
3029                         return notifier_from_errno(err);
3030         }
3031
3032         if (is_vlan_dev(info->upper_dev))
3033                 return dsa_user_check_8021q_upper(dev, info);
3034
3035         return NOTIFY_DONE;
3036 }
3037
3038 /* To be eligible as a DSA conduit, a LAG must have all lower interfaces be
3039  * eligible DSA conduits. Additionally, all LAG slaves must be DSA conduits of
3040  * switches in the same switch tree.
3041  */
3042 static int dsa_lag_conduit_validate(struct net_device *lag_dev,
3043                                     struct netlink_ext_ack *extack)
3044 {
3045         struct net_device *lower1, *lower2;
3046         struct list_head *iter1, *iter2;
3047
3048         netdev_for_each_lower_dev(lag_dev, lower1, iter1) {
3049                 netdev_for_each_lower_dev(lag_dev, lower2, iter2) {
3050                         if (!netdev_uses_dsa(lower1) ||
3051                             !netdev_uses_dsa(lower2)) {
3052                                 NL_SET_ERR_MSG_MOD(extack,
3053                                                    "All LAG ports must be eligible as DSA conduits");
3054                                 return notifier_from_errno(-EINVAL);
3055                         }
3056
3057                         if (lower1 == lower2)
3058                                 continue;
3059
3060                         if (!dsa_port_tree_same(lower1->dsa_ptr,
3061                                                 lower2->dsa_ptr)) {
3062                                 NL_SET_ERR_MSG_MOD(extack,
3063                                                    "LAG contains DSA conduits of disjoint switch trees");
3064                                 return notifier_from_errno(-EINVAL);
3065                         }
3066                 }
3067         }
3068
3069         return NOTIFY_DONE;
3070 }
3071
3072 static int
3073 dsa_conduit_prechangeupper_sanity_check(struct net_device *conduit,
3074                                         struct netdev_notifier_changeupper_info *info)
3075 {
3076         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(&info->info);
3077
3078         if (!netdev_uses_dsa(conduit))
3079                 return NOTIFY_DONE;
3080
3081         if (!info->linking)
3082                 return NOTIFY_DONE;
3083
3084         /* Allow DSA switch uppers */
3085         if (dsa_user_dev_check(info->upper_dev))
3086                 return NOTIFY_DONE;
3087
3088         /* Allow bridge uppers of DSA conduits, subject to further
3089          * restrictions in dsa_bridge_prechangelower_sanity_check()
3090          */
3091         if (netif_is_bridge_master(info->upper_dev))
3092                 return NOTIFY_DONE;
3093
3094         /* Allow LAG uppers, subject to further restrictions in
3095          * dsa_lag_conduit_prechangelower_sanity_check()
3096          */
3097         if (netif_is_lag_master(info->upper_dev))
3098                 return dsa_lag_conduit_validate(info->upper_dev, extack);
3099
3100         NL_SET_ERR_MSG_MOD(extack,
3101                            "DSA conduit cannot join unknown upper interfaces");
3102         return notifier_from_errno(-EBUSY);
3103 }
3104
3105 static int
3106 dsa_lag_conduit_prechangelower_sanity_check(struct net_device *dev,
3107                                             struct netdev_notifier_changeupper_info *info)
3108 {
3109         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(&info->info);
3110         struct net_device *lag_dev = info->upper_dev;
3111         struct net_device *lower;
3112         struct list_head *iter;
3113
3114         if (!netdev_uses_dsa(lag_dev) || !netif_is_lag_master(lag_dev))
3115                 return NOTIFY_DONE;
3116
3117         if (!info->linking)
3118                 return NOTIFY_DONE;
3119
3120         if (!netdev_uses_dsa(dev)) {
3121                 NL_SET_ERR_MSG(extack,
3122                                "Only DSA conduits can join a LAG DSA conduit");
3123                 return notifier_from_errno(-EINVAL);
3124         }
3125
3126         netdev_for_each_lower_dev(lag_dev, lower, iter) {
3127                 if (!dsa_port_tree_same(dev->dsa_ptr, lower->dsa_ptr)) {
3128                         NL_SET_ERR_MSG(extack,
3129                                        "Interface is DSA conduit for a different switch tree than this LAG");
3130                         return notifier_from_errno(-EINVAL);
3131                 }
3132
3133                 break;
3134         }
3135
3136         return NOTIFY_DONE;
3137 }
3138
3139 /* Don't allow bridging of DSA conduits, since the bridge layer rx_handler
3140  * prevents the DSA fake ethertype handler to be invoked, so we don't get the
3141  * chance to strip off and parse the DSA switch tag protocol header (the bridge
3142  * layer just returns RX_HANDLER_CONSUMED, stopping RX processing for these
3143  * frames).
3144  * The only case where that would not be an issue is when bridging can already
3145  * be offloaded, such as when the DSA conduit is itself a DSA or plain switchdev
3146  * port, and is bridged only with other ports from the same hardware device.
3147  */
3148 static int
3149 dsa_bridge_prechangelower_sanity_check(struct net_device *new_lower,
3150                                        struct netdev_notifier_changeupper_info *info)
3151 {
3152         struct net_device *br = info->upper_dev;
3153         struct netlink_ext_ack *extack;
3154         struct net_device *lower;
3155         struct list_head *iter;
3156
3157         if (!netif_is_bridge_master(br))
3158                 return NOTIFY_DONE;
3159
3160         if (!info->linking)
3161                 return NOTIFY_DONE;
3162
3163         extack = netdev_notifier_info_to_extack(&info->info);
3164
3165         netdev_for_each_lower_dev(br, lower, iter) {
3166                 if (!netdev_uses_dsa(new_lower) && !netdev_uses_dsa(lower))
3167                         continue;
3168
3169                 if (!netdev_port_same_parent_id(lower, new_lower)) {
3170                         NL_SET_ERR_MSG(extack,
3171                                        "Cannot do software bridging with a DSA conduit");
3172                         return notifier_from_errno(-EINVAL);
3173                 }
3174         }
3175
3176         return NOTIFY_DONE;
3177 }
3178
3179 static void dsa_tree_migrate_ports_from_lag_conduit(struct dsa_switch_tree *dst,
3180                                                     struct net_device *lag_dev)
3181 {
3182         struct net_device *new_conduit = dsa_tree_find_first_conduit(dst);
3183         struct dsa_port *dp;
3184         int err;
3185
3186         dsa_tree_for_each_user_port(dp, dst) {
3187                 if (dsa_port_to_conduit(dp) != lag_dev)
3188                         continue;
3189
3190                 err = dsa_user_change_conduit(dp->user, new_conduit, NULL);
3191                 if (err) {
3192                         netdev_err(dp->user,
3193                                    "failed to restore conduit to %s: %pe\n",
3194                                    new_conduit->name, ERR_PTR(err));
3195                 }
3196         }
3197 }
3198
3199 static int dsa_conduit_lag_join(struct net_device *conduit,
3200                                 struct net_device *lag_dev,
3201                                 struct netdev_lag_upper_info *uinfo,
3202                                 struct netlink_ext_ack *extack)
3203 {
3204         struct dsa_port *cpu_dp = conduit->dsa_ptr;
3205         struct dsa_switch_tree *dst = cpu_dp->dst;
3206         struct dsa_port *dp;
3207         int err;
3208
3209         err = dsa_conduit_lag_setup(lag_dev, cpu_dp, uinfo, extack);
3210         if (err)
3211                 return err;
3212
3213         dsa_tree_for_each_user_port(dp, dst) {
3214                 if (dsa_port_to_conduit(dp) != conduit)
3215                         continue;
3216
3217                 err = dsa_user_change_conduit(dp->user, lag_dev, extack);
3218                 if (err)
3219                         goto restore;
3220         }
3221
3222         return 0;
3223
3224 restore:
3225         dsa_tree_for_each_user_port_continue_reverse(dp, dst) {
3226                 if (dsa_port_to_conduit(dp) != lag_dev)
3227                         continue;
3228
3229                 err = dsa_user_change_conduit(dp->user, conduit, NULL);
3230                 if (err) {
3231                         netdev_err(dp->user,
3232                                    "failed to restore conduit to %s: %pe\n",
3233                                    conduit->name, ERR_PTR(err));
3234                 }
3235         }
3236
3237         dsa_conduit_lag_teardown(lag_dev, conduit->dsa_ptr);
3238
3239         return err;
3240 }
3241
3242 static void dsa_conduit_lag_leave(struct net_device *conduit,
3243                                   struct net_device *lag_dev)
3244 {
3245         struct dsa_port *dp, *cpu_dp = lag_dev->dsa_ptr;
3246         struct dsa_switch_tree *dst = cpu_dp->dst;
3247         struct dsa_port *new_cpu_dp = NULL;
3248         struct net_device *lower;
3249         struct list_head *iter;
3250
3251         netdev_for_each_lower_dev(lag_dev, lower, iter) {
3252                 if (netdev_uses_dsa(lower)) {
3253                         new_cpu_dp = lower->dsa_ptr;
3254                         break;
3255                 }
3256         }
3257
3258         if (new_cpu_dp) {
3259                 /* Update the CPU port of the user ports still under the LAG
3260                  * so that dsa_port_to_conduit() continues to work properly
3261                  */
3262                 dsa_tree_for_each_user_port(dp, dst)
3263                         if (dsa_port_to_conduit(dp) == lag_dev)
3264                                 dp->cpu_dp = new_cpu_dp;
3265
3266                 /* Update the index of the virtual CPU port to match the lowest
3267                  * physical CPU port
3268                  */
3269                 lag_dev->dsa_ptr = new_cpu_dp;
3270                 wmb();
3271         } else {
3272                 /* If the LAG DSA conduit has no ports left, migrate back all
3273                  * user ports to the first physical CPU port
3274                  */
3275                 dsa_tree_migrate_ports_from_lag_conduit(dst, lag_dev);
3276         }
3277
3278         /* This DSA conduit has left its LAG in any case, so let
3279          * the CPU port leave the hardware LAG as well
3280          */
3281         dsa_conduit_lag_teardown(lag_dev, conduit->dsa_ptr);
3282 }
3283
3284 static int dsa_conduit_changeupper(struct net_device *dev,
3285                                    struct netdev_notifier_changeupper_info *info)
3286 {
3287         struct netlink_ext_ack *extack;
3288         int err = NOTIFY_DONE;
3289
3290         if (!netdev_uses_dsa(dev))
3291                 return err;
3292
3293         extack = netdev_notifier_info_to_extack(&info->info);
3294
3295         if (netif_is_lag_master(info->upper_dev)) {
3296                 if (info->linking) {
3297                         err = dsa_conduit_lag_join(dev, info->upper_dev,
3298                                                    info->upper_info, extack);
3299                         err = notifier_from_errno(err);
3300                 } else {
3301                         dsa_conduit_lag_leave(dev, info->upper_dev);
3302                         err = NOTIFY_OK;
3303                 }
3304         }
3305
3306         return err;
3307 }
3308
3309 static int dsa_user_netdevice_event(struct notifier_block *nb,
3310                                     unsigned long event, void *ptr)
3311 {
3312         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3313
3314         switch (event) {
3315         case NETDEV_PRECHANGEUPPER: {
3316                 struct netdev_notifier_changeupper_info *info = ptr;
3317                 int err;
3318
3319                 err = dsa_user_prechangeupper_sanity_check(dev, info);
3320                 if (notifier_to_errno(err))
3321                         return err;
3322
3323                 err = dsa_conduit_prechangeupper_sanity_check(dev, info);
3324                 if (notifier_to_errno(err))
3325                         return err;
3326
3327                 err = dsa_lag_conduit_prechangelower_sanity_check(dev, info);
3328                 if (notifier_to_errno(err))
3329                         return err;
3330
3331                 err = dsa_bridge_prechangelower_sanity_check(dev, info);
3332                 if (notifier_to_errno(err))
3333                         return err;
3334
3335                 err = dsa_user_prechangeupper(dev, ptr);
3336                 if (notifier_to_errno(err))
3337                         return err;
3338
3339                 err = dsa_user_lag_prechangeupper(dev, ptr);
3340                 if (notifier_to_errno(err))
3341                         return err;
3342
3343                 break;
3344         }
3345         case NETDEV_CHANGEUPPER: {
3346                 int err;
3347
3348                 err = dsa_user_changeupper(dev, ptr);
3349                 if (notifier_to_errno(err))
3350                         return err;
3351
3352                 err = dsa_user_lag_changeupper(dev, ptr);
3353                 if (notifier_to_errno(err))
3354                         return err;
3355
3356                 err = dsa_conduit_changeupper(dev, ptr);
3357                 if (notifier_to_errno(err))
3358                         return err;
3359
3360                 break;
3361         }
3362         case NETDEV_CHANGELOWERSTATE: {
3363                 struct netdev_notifier_changelowerstate_info *info = ptr;
3364                 struct dsa_port *dp;
3365                 int err = 0;
3366
3367                 if (dsa_user_dev_check(dev)) {
3368                         dp = dsa_user_to_port(dev);
3369
3370                         err = dsa_port_lag_change(dp, info->lower_state_info);
3371                 }
3372
3373                 /* Mirror LAG port events on DSA conduits that are in
3374                  * a LAG towards their respective switch CPU ports
3375                  */
3376                 if (netdev_uses_dsa(dev)) {
3377                         dp = dev->dsa_ptr;
3378
3379                         err = dsa_port_lag_change(dp, info->lower_state_info);
3380                 }
3381
3382                 return notifier_from_errno(err);
3383         }
3384         case NETDEV_CHANGE:
3385         case NETDEV_UP: {
3386                 /* Track state of conduit port.
3387                  * DSA driver may require the conduit port (and indirectly
3388                  * the tagger) to be available for some special operation.
3389                  */
3390                 if (netdev_uses_dsa(dev)) {
3391                         struct dsa_port *cpu_dp = dev->dsa_ptr;
3392                         struct dsa_switch_tree *dst = cpu_dp->ds->dst;
3393
3394                         /* Track when the conduit port is UP */
3395                         dsa_tree_conduit_oper_state_change(dst, dev,
3396                                                            netif_oper_up(dev));
3397
3398                         /* Track when the conduit port is ready and can accept
3399                          * packet.
3400                          * NETDEV_UP event is not enough to flag a port as ready.
3401                          * We also have to wait for linkwatch_do_dev to dev_activate
3402                          * and emit a NETDEV_CHANGE event.
3403                          * We check if a conduit port is ready by checking if the dev
3404                          * have a qdisc assigned and is not noop.
3405                          */
3406                         dsa_tree_conduit_admin_state_change(dst, dev,
3407                                                             !qdisc_tx_is_noop(dev));
3408
3409                         return NOTIFY_OK;
3410                 }
3411
3412                 return NOTIFY_DONE;
3413         }
3414         case NETDEV_GOING_DOWN: {
3415                 struct dsa_port *dp, *cpu_dp;
3416                 struct dsa_switch_tree *dst;
3417                 LIST_HEAD(close_list);
3418
3419                 if (!netdev_uses_dsa(dev))
3420                         return NOTIFY_DONE;
3421
3422                 cpu_dp = dev->dsa_ptr;
3423                 dst = cpu_dp->ds->dst;
3424
3425                 dsa_tree_conduit_admin_state_change(dst, dev, false);
3426
3427                 list_for_each_entry(dp, &dst->ports, list) {
3428                         if (!dsa_port_is_user(dp))
3429                                 continue;
3430
3431                         if (dp->cpu_dp != cpu_dp)
3432                                 continue;
3433
3434                         list_add(&dp->user->close_list, &close_list);
3435                 }
3436
3437                 dev_close_many(&close_list, true);
3438
3439                 return NOTIFY_OK;
3440         }
3441         default:
3442                 break;
3443         }
3444
3445         return NOTIFY_DONE;
3446 }
3447
3448 static void
3449 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
3450 {
3451         struct switchdev_notifier_fdb_info info = {};
3452
3453         info.addr = switchdev_work->addr;
3454         info.vid = switchdev_work->vid;
3455         info.offloaded = true;
3456         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
3457                                  switchdev_work->orig_dev, &info.info, NULL);
3458 }
3459
3460 static void dsa_user_switchdev_event_work(struct work_struct *work)
3461 {
3462         struct dsa_switchdev_event_work *switchdev_work =
3463                 container_of(work, struct dsa_switchdev_event_work, work);
3464         const unsigned char *addr = switchdev_work->addr;
3465         struct net_device *dev = switchdev_work->dev;
3466         u16 vid = switchdev_work->vid;
3467         struct dsa_switch *ds;
3468         struct dsa_port *dp;
3469         int err;
3470
3471         dp = dsa_user_to_port(dev);
3472         ds = dp->ds;
3473
3474         switch (switchdev_work->event) {
3475         case SWITCHDEV_FDB_ADD_TO_DEVICE:
3476                 if (switchdev_work->host_addr)
3477                         err = dsa_port_bridge_host_fdb_add(dp, addr, vid);
3478                 else if (dp->lag)
3479                         err = dsa_port_lag_fdb_add(dp, addr, vid);
3480                 else
3481                         err = dsa_port_fdb_add(dp, addr, vid);
3482                 if (err) {
3483                         dev_err(ds->dev,
3484                                 "port %d failed to add %pM vid %d to fdb: %d\n",
3485                                 dp->index, addr, vid, err);
3486                         break;
3487                 }
3488                 dsa_fdb_offload_notify(switchdev_work);
3489                 break;
3490
3491         case SWITCHDEV_FDB_DEL_TO_DEVICE:
3492                 if (switchdev_work->host_addr)
3493                         err = dsa_port_bridge_host_fdb_del(dp, addr, vid);
3494                 else if (dp->lag)
3495                         err = dsa_port_lag_fdb_del(dp, addr, vid);
3496                 else
3497                         err = dsa_port_fdb_del(dp, addr, vid);
3498                 if (err) {
3499                         dev_err(ds->dev,
3500                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
3501                                 dp->index, addr, vid, err);
3502                 }
3503
3504                 break;
3505         }
3506
3507         kfree(switchdev_work);
3508 }
3509
3510 static bool dsa_foreign_dev_check(const struct net_device *dev,
3511                                   const struct net_device *foreign_dev)
3512 {
3513         const struct dsa_port *dp = dsa_user_to_port(dev);
3514         struct dsa_switch_tree *dst = dp->ds->dst;
3515
3516         if (netif_is_bridge_master(foreign_dev))
3517                 return !dsa_tree_offloads_bridge_dev(dst, foreign_dev);
3518
3519         if (netif_is_bridge_port(foreign_dev))
3520                 return !dsa_tree_offloads_bridge_port(dst, foreign_dev);
3521
3522         /* Everything else is foreign */
3523         return true;
3524 }
3525
3526 static int dsa_user_fdb_event(struct net_device *dev,
3527                               struct net_device *orig_dev,
3528                               unsigned long event, const void *ctx,
3529                               const struct switchdev_notifier_fdb_info *fdb_info)
3530 {
3531         struct dsa_switchdev_event_work *switchdev_work;
3532         struct dsa_port *dp = dsa_user_to_port(dev);
3533         bool host_addr = fdb_info->is_local;
3534         struct dsa_switch *ds = dp->ds;
3535
3536         if (ctx && ctx != dp)
3537                 return 0;
3538
3539         if (!dp->bridge)
3540                 return 0;
3541
3542         if (switchdev_fdb_is_dynamically_learned(fdb_info)) {
3543                 if (dsa_port_offloads_bridge_port(dp, orig_dev))
3544                         return 0;
3545
3546                 /* FDB entries learned by the software bridge or by foreign
3547                  * bridge ports should be installed as host addresses only if
3548                  * the driver requests assisted learning.
3549                  */
3550                 if (!ds->assisted_learning_on_cpu_port)
3551                         return 0;
3552         }
3553
3554         /* Also treat FDB entries on foreign interfaces bridged with us as host
3555          * addresses.
3556          */
3557         if (dsa_foreign_dev_check(dev, orig_dev))
3558                 host_addr = true;
3559
3560         /* Check early that we're not doing work in vain.
3561          * Host addresses on LAG ports still require regular FDB ops,
3562          * since the CPU port isn't in a LAG.
3563          */
3564         if (dp->lag && !host_addr) {
3565                 if (!ds->ops->lag_fdb_add || !ds->ops->lag_fdb_del)
3566                         return -EOPNOTSUPP;
3567         } else {
3568                 if (!ds->ops->port_fdb_add || !ds->ops->port_fdb_del)
3569                         return -EOPNOTSUPP;
3570         }
3571
3572         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
3573         if (!switchdev_work)
3574                 return -ENOMEM;
3575
3576         netdev_dbg(dev, "%s FDB entry towards %s, addr %pM vid %d%s\n",
3577                    event == SWITCHDEV_FDB_ADD_TO_DEVICE ? "Adding" : "Deleting",
3578                    orig_dev->name, fdb_info->addr, fdb_info->vid,
3579                    host_addr ? " as host address" : "");
3580
3581         INIT_WORK(&switchdev_work->work, dsa_user_switchdev_event_work);
3582         switchdev_work->event = event;
3583         switchdev_work->dev = dev;
3584         switchdev_work->orig_dev = orig_dev;
3585
3586         ether_addr_copy(switchdev_work->addr, fdb_info->addr);
3587         switchdev_work->vid = fdb_info->vid;
3588         switchdev_work->host_addr = host_addr;
3589
3590         dsa_schedule_work(&switchdev_work->work);
3591
3592         return 0;
3593 }
3594
3595 /* Called under rcu_read_lock() */
3596 static int dsa_user_switchdev_event(struct notifier_block *unused,
3597                                     unsigned long event, void *ptr)
3598 {
3599         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3600         int err;
3601
3602         switch (event) {
3603         case SWITCHDEV_PORT_ATTR_SET:
3604                 err = switchdev_handle_port_attr_set(dev, ptr,
3605                                                      dsa_user_dev_check,
3606                                                      dsa_user_port_attr_set);
3607                 return notifier_from_errno(err);
3608         case SWITCHDEV_FDB_ADD_TO_DEVICE:
3609         case SWITCHDEV_FDB_DEL_TO_DEVICE:
3610                 err = switchdev_handle_fdb_event_to_device(dev, event, ptr,
3611                                                            dsa_user_dev_check,
3612                                                            dsa_foreign_dev_check,
3613                                                            dsa_user_fdb_event);
3614                 return notifier_from_errno(err);
3615         default:
3616                 return NOTIFY_DONE;
3617         }
3618
3619         return NOTIFY_OK;
3620 }
3621
3622 static int dsa_user_switchdev_blocking_event(struct notifier_block *unused,
3623                                              unsigned long event, void *ptr)
3624 {
3625         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3626         int err;
3627
3628         switch (event) {
3629         case SWITCHDEV_PORT_OBJ_ADD:
3630                 err = switchdev_handle_port_obj_add_foreign(dev, ptr,
3631                                                             dsa_user_dev_check,
3632                                                             dsa_foreign_dev_check,
3633                                                             dsa_user_port_obj_add);
3634                 return notifier_from_errno(err);
3635         case SWITCHDEV_PORT_OBJ_DEL:
3636                 err = switchdev_handle_port_obj_del_foreign(dev, ptr,
3637                                                             dsa_user_dev_check,
3638                                                             dsa_foreign_dev_check,
3639                                                             dsa_user_port_obj_del);
3640                 return notifier_from_errno(err);
3641         case SWITCHDEV_PORT_ATTR_SET:
3642                 err = switchdev_handle_port_attr_set(dev, ptr,
3643                                                      dsa_user_dev_check,
3644                                                      dsa_user_port_attr_set);
3645                 return notifier_from_errno(err);
3646         }
3647
3648         return NOTIFY_DONE;
3649 }
3650
3651 static struct notifier_block dsa_user_nb __read_mostly = {
3652         .notifier_call  = dsa_user_netdevice_event,
3653 };
3654
3655 struct notifier_block dsa_user_switchdev_notifier = {
3656         .notifier_call = dsa_user_switchdev_event,
3657 };
3658
3659 struct notifier_block dsa_user_switchdev_blocking_notifier = {
3660         .notifier_call = dsa_user_switchdev_blocking_event,
3661 };
3662
3663 int dsa_user_register_notifier(void)
3664 {
3665         struct notifier_block *nb;
3666         int err;
3667
3668         err = register_netdevice_notifier(&dsa_user_nb);
3669         if (err)
3670                 return err;
3671
3672         err = register_switchdev_notifier(&dsa_user_switchdev_notifier);
3673         if (err)
3674                 goto err_switchdev_nb;
3675
3676         nb = &dsa_user_switchdev_blocking_notifier;
3677         err = register_switchdev_blocking_notifier(nb);
3678         if (err)
3679                 goto err_switchdev_blocking_nb;
3680
3681         return 0;
3682
3683 err_switchdev_blocking_nb:
3684         unregister_switchdev_notifier(&dsa_user_switchdev_notifier);
3685 err_switchdev_nb:
3686         unregister_netdevice_notifier(&dsa_user_nb);
3687         return err;
3688 }
3689
3690 void dsa_user_unregister_notifier(void)
3691 {
3692         struct notifier_block *nb;
3693         int err;
3694
3695         nb = &dsa_user_switchdev_blocking_notifier;
3696         err = unregister_switchdev_blocking_notifier(nb);
3697         if (err)
3698                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
3699
3700         err = unregister_switchdev_notifier(&dsa_user_switchdev_notifier);
3701         if (err)
3702                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
3703
3704         err = unregister_netdevice_notifier(&dsa_user_nb);
3705         if (err)
3706                 pr_err("DSA: failed to unregister user notifier (%d)\n", err);
3707 }