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 READ_ONCE(dsa_user_to_conduit(dev)->ifindex);
 356 }
 357
 358 int dsa_user_host_uc_install(struct net_device *dev, const u8 *addr)
 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         if (dsa_switch_supports_uc_filtering(ds)) {
 366                 err = dsa_port_standalone_host_fdb_add(dp, addr, 0);
 367                 if (err)
 368                         goto out;
 369         }
 370
 371         if (!ether_addr_equal(addr, conduit->dev_addr)) {
 372                 err = dev_uc_add(conduit, addr);
 373                 if (err < 0)
 374                         goto del_host_addr;
 375         }
 376
 377         return 0;
 378
 379 del_host_addr:
 380         if (dsa_switch_supports_uc_filtering(ds))
 381                 dsa_port_standalone_host_fdb_del(dp, addr, 0);
 382 out:
 383         return err;
 384 }
 385
 386 void dsa_user_host_uc_uninstall(struct net_device *dev)
 387 {
 388         struct net_device *conduit = dsa_user_to_conduit(dev);
 389         struct dsa_port *dp = dsa_user_to_port(dev);
 390         struct dsa_switch *ds = dp->ds;
 391
 392         if (!ether_addr_equal(dev->dev_addr, conduit->dev_addr))
 393                 dev_uc_del(conduit, dev->dev_addr);
 394
 395         if (dsa_switch_supports_uc_filtering(ds))
 396                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 397 }
 398
 399 static int dsa_user_open(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         int err;
 404
 405         err = dev_open(conduit, NULL);
 406         if (err < 0) {
 407                 netdev_err(dev, "failed to open conduit %s\n", conduit->name);
 408                 goto out;
 409         }
 410
 411         err = dsa_user_host_uc_install(dev, dev->dev_addr);
 412         if (err)
 413                 goto out;
 414
 415         err = dsa_port_enable_rt(dp, dev->phydev);
 416         if (err)
 417                 goto out_del_host_uc;
 418
 419         return 0;
 420
 421 out_del_host_uc:
 422         dsa_user_host_uc_uninstall(dev);
 423 out:
 424         return err;
 425 }
 426
 427 static int dsa_user_close(struct net_device *dev)
 428 {
 429         struct dsa_port *dp = dsa_user_to_port(dev);
 430
 431         dsa_port_disable_rt(dp);
 432
 433         dsa_user_host_uc_uninstall(dev);
 434
 435         return 0;
 436 }
 437
 438 static void dsa_user_manage_host_flood(struct net_device *dev)
 439 {
 440         bool mc = dev->flags & (IFF_PROMISC | IFF_ALLMULTI);
 441         struct dsa_port *dp = dsa_user_to_port(dev);
 442         bool uc = dev->flags & IFF_PROMISC;
 443
 444         dsa_port_set_host_flood(dp, uc, mc);
 445 }
 446
 447 static void dsa_user_change_rx_flags(struct net_device *dev, int change)
 448 {
 449         struct net_device *conduit = dsa_user_to_conduit(dev);
 450         struct dsa_port *dp = dsa_user_to_port(dev);
 451         struct dsa_switch *ds = dp->ds;
 452
 453         if (change & IFF_ALLMULTI)
 454                 dev_set_allmulti(conduit,
 455                                  dev->flags & IFF_ALLMULTI ? 1 : -1);
 456         if (change & IFF_PROMISC)
 457                 dev_set_promiscuity(conduit,
 458                                     dev->flags & IFF_PROMISC ? 1 : -1);
 459
 460         if (dsa_switch_supports_uc_filtering(ds) &&
 461             dsa_switch_supports_mc_filtering(ds))
 462                 dsa_user_manage_host_flood(dev);
 463 }
 464
 465 static void dsa_user_set_rx_mode(struct net_device *dev)
 466 {
 467         __dev_mc_sync(dev, dsa_user_sync_mc, dsa_user_unsync_mc);
 468         __dev_uc_sync(dev, dsa_user_sync_uc, dsa_user_unsync_uc);
 469 }
 470
 471 static int dsa_user_set_mac_address(struct net_device *dev, void *a)
 472 {
 473         struct dsa_port *dp = dsa_user_to_port(dev);
 474         struct dsa_switch *ds = dp->ds;
 475         struct sockaddr *addr = a;
 476         int err;
 477
 478         if (!is_valid_ether_addr(addr->sa_data))
 479                 return -EADDRNOTAVAIL;
 480
 481         if (ds->ops->port_set_mac_address) {
 482                 err = ds->ops->port_set_mac_address(ds, dp->index,
 483                                                     addr->sa_data);
 484                 if (err)
 485                         return err;
 486         }
 487
 488         /* If the port is down, the address isn't synced yet to hardware or
 489          * to the DSA conduit, so there is nothing to change.
 490          */
 491         if (!(dev->flags & IFF_UP))
 492                 goto out_change_dev_addr;
 493
 494         err = dsa_user_host_uc_install(dev, addr->sa_data);
 495         if (err)
 496                 return err;
 497
 498         dsa_user_host_uc_uninstall(dev);
 499
 500 out_change_dev_addr:
 501         eth_hw_addr_set(dev, addr->sa_data);
 502
 503         return 0;
 504 }
 505
 506 struct dsa_user_dump_ctx {
 507         struct net_device *dev;
 508         struct sk_buff *skb;
 509         struct netlink_callback *cb;
 510         int idx;
 511 };
 512
 513 static int
 514 dsa_user_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 515                           bool is_static, void *data)
 516 {
 517         struct dsa_user_dump_ctx *dump = data;
 518         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 519         u32 seq = dump->cb->nlh->nlmsg_seq;
 520         struct nlmsghdr *nlh;
 521         struct ndmsg *ndm;
 522
 523         if (dump->idx < dump->cb->args[2])
 524                 goto skip;
 525
 526         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 527                         sizeof(*ndm), NLM_F_MULTI);
 528         if (!nlh)
 529                 return -EMSGSIZE;
 530
 531         ndm = nlmsg_data(nlh);
 532         ndm->ndm_family  = AF_BRIDGE;
 533         ndm->ndm_pad1    = 0;
 534         ndm->ndm_pad2    = 0;
 535         ndm->ndm_flags   = NTF_SELF;
 536         ndm->ndm_type    = 0;
 537         ndm->ndm_ifindex = dump->dev->ifindex;
 538         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 539
 540         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 541                 goto nla_put_failure;
 542
 543         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 544                 goto nla_put_failure;
 545
 546         nlmsg_end(dump->skb, nlh);
 547
 548 skip:
 549         dump->idx++;
 550         return 0;
 551
 552 nla_put_failure:
 553         nlmsg_cancel(dump->skb, nlh);
 554         return -EMSGSIZE;
 555 }
 556
 557 static int
 558 dsa_user_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 559                   struct net_device *dev, struct net_device *filter_dev,
 560                   int *idx)
 561 {
 562         struct dsa_port *dp = dsa_user_to_port(dev);
 563         struct dsa_user_dump_ctx dump = {
 564                 .dev = dev,
 565                 .skb = skb,
 566                 .cb = cb,
 567                 .idx = *idx,
 568         };
 569         int err;
 570
 571         err = dsa_port_fdb_dump(dp, dsa_user_port_fdb_do_dump, &dump);
 572         *idx = dump.idx;
 573
 574         return err;
 575 }
 576
 577 static int dsa_user_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 578 {
 579         struct dsa_user_priv *p = netdev_priv(dev);
 580         struct dsa_switch *ds = p->dp->ds;
 581         int port = p->dp->index;
 582
 583         /* Pass through to switch driver if it supports timestamping */
 584         switch (cmd) {
 585         case SIOCGHWTSTAMP:
 586                 if (ds->ops->port_hwtstamp_get)
 587                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 588                 break;
 589         case SIOCSHWTSTAMP:
 590                 if (ds->ops->port_hwtstamp_set)
 591                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 592                 break;
 593         }
 594
 595         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 596 }
 597
 598 static int dsa_user_port_attr_set(struct net_device *dev, const void *ctx,
 599                                   const struct switchdev_attr *attr,
 600                                   struct netlink_ext_ack *extack)
 601 {
 602         struct dsa_port *dp = dsa_user_to_port(dev);
 603         int ret;
 604
 605         if (ctx && ctx != dp)
 606                 return 0;
 607
 608         switch (attr->id) {
 609         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 610                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 611                         return -EOPNOTSUPP;
 612
 613                 ret = dsa_port_set_state(dp, attr->u.stp_state, true);
 614                 break;
 615         case SWITCHDEV_ATTR_ID_PORT_MST_STATE:
 616                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 617                         return -EOPNOTSUPP;
 618
 619                 ret = dsa_port_set_mst_state(dp, &attr->u.mst_state, extack);
 620                 break;
 621         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 622                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 623                         return -EOPNOTSUPP;
 624
 625                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 626                                               extack);
 627                 break;
 628         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 629                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 630                         return -EOPNOTSUPP;
 631
 632                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 633                 break;
 634         case SWITCHDEV_ATTR_ID_BRIDGE_MST:
 635                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 636                         return -EOPNOTSUPP;
 637
 638                 ret = dsa_port_mst_enable(dp, attr->u.mst, extack);
 639                 break;
 640         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 641                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 642                         return -EOPNOTSUPP;
 643
 644                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 645                                                 extack);
 646                 break;
 647         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 648                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 649                         return -EOPNOTSUPP;
 650
 651                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 652                 break;
 653         case SWITCHDEV_ATTR_ID_VLAN_MSTI:
 654                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 655                         return -EOPNOTSUPP;
 656
 657                 ret = dsa_port_vlan_msti(dp, &attr->u.vlan_msti);
 658                 break;
 659         default:
 660                 ret = -EOPNOTSUPP;
 661                 break;
 662         }
 663
 664         return ret;
 665 }
 666
 667 /* Must be called under rcu_read_lock() */
 668 static int
 669 dsa_user_vlan_check_for_8021q_uppers(struct net_device *user,
 670                                      const struct switchdev_obj_port_vlan *vlan)
 671 {
 672         struct net_device *upper_dev;
 673         struct list_head *iter;
 674
 675         netdev_for_each_upper_dev_rcu(user, upper_dev, iter) {
 676                 u16 vid;
 677
 678                 if (!is_vlan_dev(upper_dev))
 679                         continue;
 680
 681                 vid = vlan_dev_vlan_id(upper_dev);
 682                 if (vid == vlan->vid)
 683                         return -EBUSY;
 684         }
 685
 686         return 0;
 687 }
 688
 689 static int dsa_user_vlan_add(struct net_device *dev,
 690                              const struct switchdev_obj *obj,
 691                              struct netlink_ext_ack *extack)
 692 {
 693         struct dsa_port *dp = dsa_user_to_port(dev);
 694         struct switchdev_obj_port_vlan *vlan;
 695         int err;
 696
 697         if (dsa_port_skip_vlan_configuration(dp)) {
 698                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 699                 return 0;
 700         }
 701
 702         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 703
 704         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 705          * the same VID.
 706          */
 707         if (br_vlan_enabled(dsa_port_bridge_dev_get(dp))) {
 708                 rcu_read_lock();
 709                 err = dsa_user_vlan_check_for_8021q_uppers(dev, vlan);
 710                 rcu_read_unlock();
 711                 if (err) {
 712                         NL_SET_ERR_MSG_MOD(extack,
 713                                            "Port already has a VLAN upper with this VID");
 714                         return err;
 715                 }
 716         }
 717
 718         return dsa_port_vlan_add(dp, vlan, extack);
 719 }
 720
 721 /* Offload a VLAN installed on the bridge or on a foreign interface by
 722  * installing it as a VLAN towards the CPU port.
 723  */
 724 static int dsa_user_host_vlan_add(struct net_device *dev,
 725                                   const struct switchdev_obj *obj,
 726                                   struct netlink_ext_ack *extack)
 727 {
 728         struct dsa_port *dp = dsa_user_to_port(dev);
 729         struct switchdev_obj_port_vlan vlan;
 730
 731         /* Do nothing if this is a software bridge */
 732         if (!dp->bridge)
 733                 return -EOPNOTSUPP;
 734
 735         if (dsa_port_skip_vlan_configuration(dp)) {
 736                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 737                 return 0;
 738         }
 739
 740         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 741
 742         /* Even though drivers often handle CPU membership in special ways,
 743          * it doesn't make sense to program a PVID, so clear this flag.
 744          */
 745         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 746
 747         return dsa_port_host_vlan_add(dp, &vlan, extack);
 748 }
 749
 750 static int dsa_user_port_obj_add(struct net_device *dev, const void *ctx,
 751                                  const struct switchdev_obj *obj,
 752                                  struct netlink_ext_ack *extack)
 753 {
 754         struct dsa_port *dp = dsa_user_to_port(dev);
 755         int err;
 756
 757         if (ctx && ctx != dp)
 758                 return 0;
 759
 760         switch (obj->id) {
 761         case SWITCHDEV_OBJ_ID_PORT_MDB:
 762                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 763                         return -EOPNOTSUPP;
 764
 765                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 766                 break;
 767         case SWITCHDEV_OBJ_ID_HOST_MDB:
 768                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 769                         return -EOPNOTSUPP;
 770
 771                 err = dsa_port_bridge_host_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 772                 break;
 773         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 774                 if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 775                         err = dsa_user_vlan_add(dev, obj, extack);
 776                 else
 777                         err = dsa_user_host_vlan_add(dev, obj, extack);
 778                 break;
 779         case SWITCHDEV_OBJ_ID_MRP:
 780                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 781                         return -EOPNOTSUPP;
 782
 783                 err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 784                 break;
 785         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 786                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 787                         return -EOPNOTSUPP;
 788
 789                 err = dsa_port_mrp_add_ring_role(dp,
 790                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 791                 break;
 792         default:
 793                 err = -EOPNOTSUPP;
 794                 break;
 795         }
 796
 797         return err;
 798 }
 799
 800 static int dsa_user_vlan_del(struct net_device *dev,
 801                              const struct switchdev_obj *obj)
 802 {
 803         struct dsa_port *dp = dsa_user_to_port(dev);
 804         struct switchdev_obj_port_vlan *vlan;
 805
 806         if (dsa_port_skip_vlan_configuration(dp))
 807                 return 0;
 808
 809         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 810
 811         return dsa_port_vlan_del(dp, vlan);
 812 }
 813
 814 static int dsa_user_host_vlan_del(struct net_device *dev,
 815                                   const struct switchdev_obj *obj)
 816 {
 817         struct dsa_port *dp = dsa_user_to_port(dev);
 818         struct switchdev_obj_port_vlan *vlan;
 819
 820         /* Do nothing if this is a software bridge */
 821         if (!dp->bridge)
 822                 return -EOPNOTSUPP;
 823
 824         if (dsa_port_skip_vlan_configuration(dp))
 825                 return 0;
 826
 827         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 828
 829         return dsa_port_host_vlan_del(dp, vlan);
 830 }
 831
 832 static int dsa_user_port_obj_del(struct net_device *dev, const void *ctx,
 833                                  const struct switchdev_obj *obj)
 834 {
 835         struct dsa_port *dp = dsa_user_to_port(dev);
 836         int err;
 837
 838         if (ctx && ctx != dp)
 839                 return 0;
 840
 841         switch (obj->id) {
 842         case SWITCHDEV_OBJ_ID_PORT_MDB:
 843                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 844                         return -EOPNOTSUPP;
 845
 846                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 847                 break;
 848         case SWITCHDEV_OBJ_ID_HOST_MDB:
 849                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 850                         return -EOPNOTSUPP;
 851
 852                 err = dsa_port_bridge_host_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 853                 break;
 854         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 855                 if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 856                         err = dsa_user_vlan_del(dev, obj);
 857                 else
 858                         err = dsa_user_host_vlan_del(dev, obj);
 859                 break;
 860         case SWITCHDEV_OBJ_ID_MRP:
 861                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 862                         return -EOPNOTSUPP;
 863
 864                 err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 865                 break;
 866         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 867                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 868                         return -EOPNOTSUPP;
 869
 870                 err = dsa_port_mrp_del_ring_role(dp,
 871                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 872                 break;
 873         default:
 874                 err = -EOPNOTSUPP;
 875                 break;
 876         }
 877
 878         return err;
 879 }
 880
 881 static netdev_tx_t dsa_user_netpoll_send_skb(struct net_device *dev,
 882                                              struct sk_buff *skb)
 883 {
 884 #ifdef CONFIG_NET_POLL_CONTROLLER
 885         struct dsa_user_priv *p = netdev_priv(dev);
 886
 887         return netpoll_send_skb(p->netpoll, skb);
 888 #else
 889         BUG();
 890         return NETDEV_TX_OK;
 891 #endif
 892 }
 893
 894 static void dsa_skb_tx_timestamp(struct dsa_user_priv *p,
 895                                  struct sk_buff *skb)
 896 {
 897         struct dsa_switch *ds = p->dp->ds;
 898
 899         if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 900                 return;
 901
 902         if (!ds->ops->port_txtstamp)
 903                 return;
 904
 905         ds->ops->port_txtstamp(ds, p->dp->index, skb);
 906 }
 907
 908 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 909 {
 910         /* SKB for netpoll still need to be mangled with the protocol-specific
 911          * tag to be successfully transmitted
 912          */
 913         if (unlikely(netpoll_tx_running(dev)))
 914                 return dsa_user_netpoll_send_skb(dev, skb);
 915
 916         /* Queue the SKB for transmission on the parent interface, but
 917          * do not modify its EtherType
 918          */
 919         skb->dev = dsa_user_to_conduit(dev);
 920         dev_queue_xmit(skb);
 921
 922         return NETDEV_TX_OK;
 923 }
 924 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 925
 926 static netdev_tx_t dsa_user_xmit(struct sk_buff *skb, struct net_device *dev)
 927 {
 928         struct dsa_user_priv *p = netdev_priv(dev);
 929         struct sk_buff *nskb;
 930
 931         dev_sw_netstats_tx_add(dev, 1, skb->len);
 932
 933         memset(skb->cb, 0, sizeof(skb->cb));
 934
 935         /* Handle tx timestamp if any */
 936         dsa_skb_tx_timestamp(p, skb);
 937
 938         if (skb_ensure_writable_head_tail(skb, dev)) {
 939                 dev_kfree_skb_any(skb);
 940                 return NETDEV_TX_OK;
 941         }
 942
 943         /* needed_tailroom should still be 'warm' in the cache line from
 944          * skb_ensure_writable_head_tail(), which has also ensured that
 945          * padding is safe.
 946          */
 947         if (dev->needed_tailroom)
 948                 eth_skb_pad(skb);
 949
 950         /* Transmit function may have to reallocate the original SKB,
 951          * in which case it must have freed it. Only free it here on error.
 952          */
 953         nskb = p->xmit(skb, dev);
 954         if (!nskb) {
 955                 kfree_skb(skb);
 956                 return NETDEV_TX_OK;
 957         }
 958
 959         return dsa_enqueue_skb(nskb, dev);
 960 }
 961
 962 /* ethtool operations *******************************************************/
 963
 964 static void dsa_user_get_drvinfo(struct net_device *dev,
 965                                  struct ethtool_drvinfo *drvinfo)
 966 {
 967         strscpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 968         strscpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 969         strscpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 970 }
 971
 972 static int dsa_user_get_regs_len(struct net_device *dev)
 973 {
 974         struct dsa_port *dp = dsa_user_to_port(dev);
 975         struct dsa_switch *ds = dp->ds;
 976
 977         if (ds->ops->get_regs_len)
 978                 return ds->ops->get_regs_len(ds, dp->index);
 979
 980         return -EOPNOTSUPP;
 981 }
 982
 983 static void
 984 dsa_user_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 985 {
 986         struct dsa_port *dp = dsa_user_to_port(dev);
 987         struct dsa_switch *ds = dp->ds;
 988
 989         if (ds->ops->get_regs)
 990                 ds->ops->get_regs(ds, dp->index, regs, _p);
 991 }
 992
 993 static int dsa_user_nway_reset(struct net_device *dev)
 994 {
 995         struct dsa_port *dp = dsa_user_to_port(dev);
 996
 997         return phylink_ethtool_nway_reset(dp->pl);
 998 }
 999
1000 static int dsa_user_get_eeprom_len(struct net_device *dev)
1001 {
1002         struct dsa_port *dp = dsa_user_to_port(dev);
1003         struct dsa_switch *ds = dp->ds;
1004
1005         if (ds->cd && ds->cd->eeprom_len)
1006                 return ds->cd->eeprom_len;
1007
1008         if (ds->ops->get_eeprom_len)
1009                 return ds->ops->get_eeprom_len(ds);
1010
1011         return 0;
1012 }
1013
1014 static int dsa_user_get_eeprom(struct net_device *dev,
1015                                struct ethtool_eeprom *eeprom, u8 *data)
1016 {
1017         struct dsa_port *dp = dsa_user_to_port(dev);
1018         struct dsa_switch *ds = dp->ds;
1019
1020         if (ds->ops->get_eeprom)
1021                 return ds->ops->get_eeprom(ds, eeprom, data);
1022
1023         return -EOPNOTSUPP;
1024 }
1025
1026 static int dsa_user_set_eeprom(struct net_device *dev,
1027                                struct ethtool_eeprom *eeprom, u8 *data)
1028 {
1029         struct dsa_port *dp = dsa_user_to_port(dev);
1030         struct dsa_switch *ds = dp->ds;
1031
1032         if (ds->ops->set_eeprom)
1033                 return ds->ops->set_eeprom(ds, eeprom, data);
1034
1035         return -EOPNOTSUPP;
1036 }
1037
1038 static void dsa_user_get_strings(struct net_device *dev,
1039                                  uint32_t stringset, uint8_t *data)
1040 {
1041         struct dsa_port *dp = dsa_user_to_port(dev);
1042         struct dsa_switch *ds = dp->ds;
1043
1044         if (stringset == ETH_SS_STATS) {
1045                 int len = ETH_GSTRING_LEN;
1046
1047                 strscpy_pad(data, "tx_packets", len);
1048                 strscpy_pad(data + len, "tx_bytes", len);
1049                 strscpy_pad(data + 2 * len, "rx_packets", len);
1050                 strscpy_pad(data + 3 * len, "rx_bytes", len);
1051                 if (ds->ops->get_strings)
1052                         ds->ops->get_strings(ds, dp->index, stringset,
1053                                              data + 4 * len);
1054         } else if (stringset ==  ETH_SS_TEST) {
1055                 net_selftest_get_strings(data);
1056         }
1057
1058 }
1059
1060 static void dsa_user_get_ethtool_stats(struct net_device *dev,
1061                                        struct ethtool_stats *stats,
1062                                        uint64_t *data)
1063 {
1064         struct dsa_port *dp = dsa_user_to_port(dev);
1065         struct dsa_switch *ds = dp->ds;
1066         struct pcpu_sw_netstats *s;
1067         unsigned int start;
1068         int i;
1069
1070         for_each_possible_cpu(i) {
1071                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
1072
1073                 s = per_cpu_ptr(dev->tstats, i);
1074                 do {
1075                         start = u64_stats_fetch_begin(&s->syncp);
1076                         tx_packets = u64_stats_read(&s->tx_packets);
1077                         tx_bytes = u64_stats_read(&s->tx_bytes);
1078                         rx_packets = u64_stats_read(&s->rx_packets);
1079                         rx_bytes = u64_stats_read(&s->rx_bytes);
1080                 } while (u64_stats_fetch_retry(&s->syncp, start));
1081                 data[0] += tx_packets;
1082                 data[1] += tx_bytes;
1083                 data[2] += rx_packets;
1084                 data[3] += rx_bytes;
1085         }
1086         if (ds->ops->get_ethtool_stats)
1087                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
1088 }
1089
1090 static int dsa_user_get_sset_count(struct net_device *dev, int sset)
1091 {
1092         struct dsa_port *dp = dsa_user_to_port(dev);
1093         struct dsa_switch *ds = dp->ds;
1094
1095         if (sset == ETH_SS_STATS) {
1096                 int count = 0;
1097
1098                 if (ds->ops->get_sset_count) {
1099                         count = ds->ops->get_sset_count(ds, dp->index, sset);
1100                         if (count < 0)
1101                                 return count;
1102                 }
1103
1104                 return count + 4;
1105         } else if (sset ==  ETH_SS_TEST) {
1106                 return net_selftest_get_count();
1107         }
1108
1109         return -EOPNOTSUPP;
1110 }
1111
1112 static void dsa_user_get_eth_phy_stats(struct net_device *dev,
1113                                        struct ethtool_eth_phy_stats *phy_stats)
1114 {
1115         struct dsa_port *dp = dsa_user_to_port(dev);
1116         struct dsa_switch *ds = dp->ds;
1117
1118         if (ds->ops->get_eth_phy_stats)
1119                 ds->ops->get_eth_phy_stats(ds, dp->index, phy_stats);
1120 }
1121
1122 static void dsa_user_get_eth_mac_stats(struct net_device *dev,
1123                                        struct ethtool_eth_mac_stats *mac_stats)
1124 {
1125         struct dsa_port *dp = dsa_user_to_port(dev);
1126         struct dsa_switch *ds = dp->ds;
1127
1128         if (ds->ops->get_eth_mac_stats)
1129                 ds->ops->get_eth_mac_stats(ds, dp->index, mac_stats);
1130 }
1131
1132 static void
1133 dsa_user_get_eth_ctrl_stats(struct net_device *dev,
1134                             struct ethtool_eth_ctrl_stats *ctrl_stats)
1135 {
1136         struct dsa_port *dp = dsa_user_to_port(dev);
1137         struct dsa_switch *ds = dp->ds;
1138
1139         if (ds->ops->get_eth_ctrl_stats)
1140                 ds->ops->get_eth_ctrl_stats(ds, dp->index, ctrl_stats);
1141 }
1142
1143 static void
1144 dsa_user_get_rmon_stats(struct net_device *dev,
1145                         struct ethtool_rmon_stats *rmon_stats,
1146                         const struct ethtool_rmon_hist_range **ranges)
1147 {
1148         struct dsa_port *dp = dsa_user_to_port(dev);
1149         struct dsa_switch *ds = dp->ds;
1150
1151         if (ds->ops->get_rmon_stats)
1152                 ds->ops->get_rmon_stats(ds, dp->index, rmon_stats, ranges);
1153 }
1154
1155 static void dsa_user_net_selftest(struct net_device *ndev,
1156                                   struct ethtool_test *etest, u64 *buf)
1157 {
1158         struct dsa_port *dp = dsa_user_to_port(ndev);
1159         struct dsa_switch *ds = dp->ds;
1160
1161         if (ds->ops->self_test) {
1162                 ds->ops->self_test(ds, dp->index, etest, buf);
1163                 return;
1164         }
1165
1166         net_selftest(ndev, etest, buf);
1167 }
1168
1169 static int dsa_user_get_mm(struct net_device *dev,
1170                            struct ethtool_mm_state *state)
1171 {
1172         struct dsa_port *dp = dsa_user_to_port(dev);
1173         struct dsa_switch *ds = dp->ds;
1174
1175         if (!ds->ops->get_mm)
1176                 return -EOPNOTSUPP;
1177
1178         return ds->ops->get_mm(ds, dp->index, state);
1179 }
1180
1181 static int dsa_user_set_mm(struct net_device *dev, struct ethtool_mm_cfg *cfg,
1182                            struct netlink_ext_ack *extack)
1183 {
1184         struct dsa_port *dp = dsa_user_to_port(dev);
1185         struct dsa_switch *ds = dp->ds;
1186
1187         if (!ds->ops->set_mm)
1188                 return -EOPNOTSUPP;
1189
1190         return ds->ops->set_mm(ds, dp->index, cfg, extack);
1191 }
1192
1193 static void dsa_user_get_mm_stats(struct net_device *dev,
1194                                   struct ethtool_mm_stats *stats)
1195 {
1196         struct dsa_port *dp = dsa_user_to_port(dev);
1197         struct dsa_switch *ds = dp->ds;
1198
1199         if (ds->ops->get_mm_stats)
1200                 ds->ops->get_mm_stats(ds, dp->index, stats);
1201 }
1202
1203 static void dsa_user_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1204 {
1205         struct dsa_port *dp = dsa_user_to_port(dev);
1206         struct dsa_switch *ds = dp->ds;
1207
1208         phylink_ethtool_get_wol(dp->pl, w);
1209
1210         if (ds->ops->get_wol)
1211                 ds->ops->get_wol(ds, dp->index, w);
1212 }
1213
1214 static int dsa_user_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1215 {
1216         struct dsa_port *dp = dsa_user_to_port(dev);
1217         struct dsa_switch *ds = dp->ds;
1218         int ret = -EOPNOTSUPP;
1219
1220         phylink_ethtool_set_wol(dp->pl, w);
1221
1222         if (ds->ops->set_wol)
1223                 ret = ds->ops->set_wol(ds, dp->index, w);
1224
1225         return ret;
1226 }
1227
1228 static int dsa_user_set_eee(struct net_device *dev, struct ethtool_keee *e)
1229 {
1230         struct dsa_port *dp = dsa_user_to_port(dev);
1231         struct dsa_switch *ds = dp->ds;
1232         int ret;
1233
1234         /* Port's PHY and MAC both need to be EEE capable */
1235         if (!dev->phydev || !dp->pl)
1236                 return -ENODEV;
1237
1238         if (!ds->ops->set_mac_eee)
1239                 return -EOPNOTSUPP;
1240
1241         ret = ds->ops->set_mac_eee(ds, dp->index, e);
1242         if (ret)
1243                 return ret;
1244
1245         return phylink_ethtool_set_eee(dp->pl, e);
1246 }
1247
1248 static int dsa_user_get_eee(struct net_device *dev, struct ethtool_keee *e)
1249 {
1250         struct dsa_port *dp = dsa_user_to_port(dev);
1251         struct dsa_switch *ds = dp->ds;
1252         int ret;
1253
1254         /* Port's PHY and MAC both need to be EEE capable */
1255         if (!dev->phydev || !dp->pl)
1256                 return -ENODEV;
1257
1258         if (!ds->ops->get_mac_eee)
1259                 return -EOPNOTSUPP;
1260
1261         ret = ds->ops->get_mac_eee(ds, dp->index, e);
1262         if (ret)
1263                 return ret;
1264
1265         return phylink_ethtool_get_eee(dp->pl, e);
1266 }
1267
1268 static int dsa_user_get_link_ksettings(struct net_device *dev,
1269                                        struct ethtool_link_ksettings *cmd)
1270 {
1271         struct dsa_port *dp = dsa_user_to_port(dev);
1272
1273         return phylink_ethtool_ksettings_get(dp->pl, cmd);
1274 }
1275
1276 static int dsa_user_set_link_ksettings(struct net_device *dev,
1277                                        const struct ethtool_link_ksettings *cmd)
1278 {
1279         struct dsa_port *dp = dsa_user_to_port(dev);
1280
1281         return phylink_ethtool_ksettings_set(dp->pl, cmd);
1282 }
1283
1284 static void dsa_user_get_pause_stats(struct net_device *dev,
1285                                      struct ethtool_pause_stats *pause_stats)
1286 {
1287         struct dsa_port *dp = dsa_user_to_port(dev);
1288         struct dsa_switch *ds = dp->ds;
1289
1290         if (ds->ops->get_pause_stats)
1291                 ds->ops->get_pause_stats(ds, dp->index, pause_stats);
1292 }
1293
1294 static void dsa_user_get_pauseparam(struct net_device *dev,
1295                                     struct ethtool_pauseparam *pause)
1296 {
1297         struct dsa_port *dp = dsa_user_to_port(dev);
1298
1299         phylink_ethtool_get_pauseparam(dp->pl, pause);
1300 }
1301
1302 static int dsa_user_set_pauseparam(struct net_device *dev,
1303                                    struct ethtool_pauseparam *pause)
1304 {
1305         struct dsa_port *dp = dsa_user_to_port(dev);
1306
1307         return phylink_ethtool_set_pauseparam(dp->pl, pause);
1308 }
1309
1310 #ifdef CONFIG_NET_POLL_CONTROLLER
1311 static int dsa_user_netpoll_setup(struct net_device *dev,
1312                                   struct netpoll_info *ni)
1313 {
1314         struct net_device *conduit = dsa_user_to_conduit(dev);
1315         struct dsa_user_priv *p = netdev_priv(dev);
1316         struct netpoll *netpoll;
1317         int err = 0;
1318
1319         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1320         if (!netpoll)
1321                 return -ENOMEM;
1322
1323         err = __netpoll_setup(netpoll, conduit);
1324         if (err) {
1325                 kfree(netpoll);
1326                 goto out;
1327         }
1328
1329         p->netpoll = netpoll;
1330 out:
1331         return err;
1332 }
1333
1334 static void dsa_user_netpoll_cleanup(struct net_device *dev)
1335 {
1336         struct dsa_user_priv *p = netdev_priv(dev);
1337         struct netpoll *netpoll = p->netpoll;
1338
1339         if (!netpoll)
1340                 return;
1341
1342         p->netpoll = NULL;
1343
1344         __netpoll_free(netpoll);
1345 }
1346
1347 static void dsa_user_poll_controller(struct net_device *dev)
1348 {
1349 }
1350 #endif
1351
1352 static struct dsa_mall_tc_entry *
1353 dsa_user_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
1354 {
1355         struct dsa_user_priv *p = netdev_priv(dev);
1356         struct dsa_mall_tc_entry *mall_tc_entry;
1357
1358         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
1359                 if (mall_tc_entry->cookie == cookie)
1360                         return mall_tc_entry;
1361
1362         return NULL;
1363 }
1364
1365 static int
1366 dsa_user_add_cls_matchall_mirred(struct net_device *dev,
1367                                  struct tc_cls_matchall_offload *cls,
1368                                  bool ingress)
1369 {
1370         struct netlink_ext_ack *extack = cls->common.extack;
1371         struct dsa_port *dp = dsa_user_to_port(dev);
1372         struct dsa_user_priv *p = netdev_priv(dev);
1373         struct dsa_mall_mirror_tc_entry *mirror;
1374         struct dsa_mall_tc_entry *mall_tc_entry;
1375         struct dsa_switch *ds = dp->ds;
1376         struct flow_action_entry *act;
1377         struct dsa_port *to_dp;
1378         int err;
1379
1380         if (!ds->ops->port_mirror_add)
1381                 return -EOPNOTSUPP;
1382
1383         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1384                                               cls->common.extack))
1385                 return -EOPNOTSUPP;
1386
1387         act = &cls->rule->action.entries[0];
1388
1389         if (!act->dev)
1390                 return -EINVAL;
1391
1392         if (!dsa_user_dev_check(act->dev))
1393                 return -EOPNOTSUPP;
1394
1395         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1396         if (!mall_tc_entry)
1397                 return -ENOMEM;
1398
1399         mall_tc_entry->cookie = cls->cookie;
1400         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1401         mirror = &mall_tc_entry->mirror;
1402
1403         to_dp = dsa_user_to_port(act->dev);
1404
1405         mirror->to_local_port = to_dp->index;
1406         mirror->ingress = ingress;
1407
1408         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress, extack);
1409         if (err) {
1410                 kfree(mall_tc_entry);
1411                 return err;
1412         }
1413
1414         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1415
1416         return err;
1417 }
1418
1419 static int
1420 dsa_user_add_cls_matchall_police(struct net_device *dev,
1421                                  struct tc_cls_matchall_offload *cls,
1422                                  bool ingress)
1423 {
1424         struct netlink_ext_ack *extack = cls->common.extack;
1425         struct dsa_port *dp = dsa_user_to_port(dev);
1426         struct dsa_user_priv *p = netdev_priv(dev);
1427         struct dsa_mall_policer_tc_entry *policer;
1428         struct dsa_mall_tc_entry *mall_tc_entry;
1429         struct dsa_switch *ds = dp->ds;
1430         struct flow_action_entry *act;
1431         int err;
1432
1433         if (!ds->ops->port_policer_add) {
1434                 NL_SET_ERR_MSG_MOD(extack,
1435                                    "Policing offload not implemented");
1436                 return -EOPNOTSUPP;
1437         }
1438
1439         if (!ingress) {
1440                 NL_SET_ERR_MSG_MOD(extack,
1441                                    "Only supported on ingress qdisc");
1442                 return -EOPNOTSUPP;
1443         }
1444
1445         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1446                                               cls->common.extack))
1447                 return -EOPNOTSUPP;
1448
1449         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1450                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1451                         NL_SET_ERR_MSG_MOD(extack,
1452                                            "Only one port policer allowed");
1453                         return -EEXIST;
1454                 }
1455         }
1456
1457         act = &cls->rule->action.entries[0];
1458
1459         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1460         if (!mall_tc_entry)
1461                 return -ENOMEM;
1462
1463         mall_tc_entry->cookie = cls->cookie;
1464         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1465         policer = &mall_tc_entry->policer;
1466         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1467         policer->burst = act->police.burst;
1468
1469         err = ds->ops->port_policer_add(ds, dp->index, policer);
1470         if (err) {
1471                 kfree(mall_tc_entry);
1472                 return err;
1473         }
1474
1475         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1476
1477         return err;
1478 }
1479
1480 static int dsa_user_add_cls_matchall(struct net_device *dev,
1481                                      struct tc_cls_matchall_offload *cls,
1482                                      bool ingress)
1483 {
1484         int err = -EOPNOTSUPP;
1485
1486         if (cls->common.protocol == htons(ETH_P_ALL) &&
1487             flow_offload_has_one_action(&cls->rule->action) &&
1488             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1489                 err = dsa_user_add_cls_matchall_mirred(dev, cls, ingress);
1490         else if (flow_offload_has_one_action(&cls->rule->action) &&
1491                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1492                 err = dsa_user_add_cls_matchall_police(dev, cls, ingress);
1493
1494         return err;
1495 }
1496
1497 static void dsa_user_del_cls_matchall(struct net_device *dev,
1498                                       struct tc_cls_matchall_offload *cls)
1499 {
1500         struct dsa_port *dp = dsa_user_to_port(dev);
1501         struct dsa_mall_tc_entry *mall_tc_entry;
1502         struct dsa_switch *ds = dp->ds;
1503
1504         mall_tc_entry = dsa_user_mall_tc_entry_find(dev, cls->cookie);
1505         if (!mall_tc_entry)
1506                 return;
1507
1508         list_del(&mall_tc_entry->list);
1509
1510         switch (mall_tc_entry->type) {
1511         case DSA_PORT_MALL_MIRROR:
1512                 if (ds->ops->port_mirror_del)
1513                         ds->ops->port_mirror_del(ds, dp->index,
1514                                                  &mall_tc_entry->mirror);
1515                 break;
1516         case DSA_PORT_MALL_POLICER:
1517                 if (ds->ops->port_policer_del)
1518                         ds->ops->port_policer_del(ds, dp->index);
1519                 break;
1520         default:
1521                 WARN_ON(1);
1522         }
1523
1524         kfree(mall_tc_entry);
1525 }
1526
1527 static int dsa_user_setup_tc_cls_matchall(struct net_device *dev,
1528                                           struct tc_cls_matchall_offload *cls,
1529                                           bool ingress)
1530 {
1531         if (cls->common.chain_index)
1532                 return -EOPNOTSUPP;
1533
1534         switch (cls->command) {
1535         case TC_CLSMATCHALL_REPLACE:
1536                 return dsa_user_add_cls_matchall(dev, cls, ingress);
1537         case TC_CLSMATCHALL_DESTROY:
1538                 dsa_user_del_cls_matchall(dev, cls);
1539                 return 0;
1540         default:
1541                 return -EOPNOTSUPP;
1542         }
1543 }
1544
1545 static int dsa_user_add_cls_flower(struct net_device *dev,
1546                                    struct flow_cls_offload *cls,
1547                                    bool ingress)
1548 {
1549         struct dsa_port *dp = dsa_user_to_port(dev);
1550         struct dsa_switch *ds = dp->ds;
1551         int port = dp->index;
1552
1553         if (!ds->ops->cls_flower_add)
1554                 return -EOPNOTSUPP;
1555
1556         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1557 }
1558
1559 static int dsa_user_del_cls_flower(struct net_device *dev,
1560                                    struct flow_cls_offload *cls,
1561                                    bool ingress)
1562 {
1563         struct dsa_port *dp = dsa_user_to_port(dev);
1564         struct dsa_switch *ds = dp->ds;
1565         int port = dp->index;
1566
1567         if (!ds->ops->cls_flower_del)
1568                 return -EOPNOTSUPP;
1569
1570         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1571 }
1572
1573 static int dsa_user_stats_cls_flower(struct net_device *dev,
1574                                      struct flow_cls_offload *cls,
1575                                      bool ingress)
1576 {
1577         struct dsa_port *dp = dsa_user_to_port(dev);
1578         struct dsa_switch *ds = dp->ds;
1579         int port = dp->index;
1580
1581         if (!ds->ops->cls_flower_stats)
1582                 return -EOPNOTSUPP;
1583
1584         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1585 }
1586
1587 static int dsa_user_setup_tc_cls_flower(struct net_device *dev,
1588                                         struct flow_cls_offload *cls,
1589                                         bool ingress)
1590 {
1591         switch (cls->command) {
1592         case FLOW_CLS_REPLACE:
1593                 return dsa_user_add_cls_flower(dev, cls, ingress);
1594         case FLOW_CLS_DESTROY:
1595                 return dsa_user_del_cls_flower(dev, cls, ingress);
1596         case FLOW_CLS_STATS:
1597                 return dsa_user_stats_cls_flower(dev, cls, ingress);
1598         default:
1599                 return -EOPNOTSUPP;
1600         }
1601 }
1602
1603 static int dsa_user_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1604                                       void *cb_priv, bool ingress)
1605 {
1606         struct net_device *dev = cb_priv;
1607
1608         if (!tc_can_offload(dev))
1609                 return -EOPNOTSUPP;
1610
1611         switch (type) {
1612         case TC_SETUP_CLSMATCHALL:
1613                 return dsa_user_setup_tc_cls_matchall(dev, type_data, ingress);
1614         case TC_SETUP_CLSFLOWER:
1615                 return dsa_user_setup_tc_cls_flower(dev, type_data, ingress);
1616         default:
1617                 return -EOPNOTSUPP;
1618         }
1619 }
1620
1621 static int dsa_user_setup_tc_block_cb_ig(enum tc_setup_type type,
1622                                          void *type_data, void *cb_priv)
1623 {
1624         return dsa_user_setup_tc_block_cb(type, type_data, cb_priv, true);
1625 }
1626
1627 static int dsa_user_setup_tc_block_cb_eg(enum tc_setup_type type,
1628                                          void *type_data, void *cb_priv)
1629 {
1630         return dsa_user_setup_tc_block_cb(type, type_data, cb_priv, false);
1631 }
1632
1633 static LIST_HEAD(dsa_user_block_cb_list);
1634
1635 static int dsa_user_setup_tc_block(struct net_device *dev,
1636                                    struct flow_block_offload *f)
1637 {
1638         struct flow_block_cb *block_cb;
1639         flow_setup_cb_t *cb;
1640
1641         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1642                 cb = dsa_user_setup_tc_block_cb_ig;
1643         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1644                 cb = dsa_user_setup_tc_block_cb_eg;
1645         else
1646                 return -EOPNOTSUPP;
1647
1648         f->driver_block_list = &dsa_user_block_cb_list;
1649
1650         switch (f->command) {
1651         case FLOW_BLOCK_BIND:
1652                 if (flow_block_cb_is_busy(cb, dev, &dsa_user_block_cb_list))
1653                         return -EBUSY;
1654
1655                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1656                 if (IS_ERR(block_cb))
1657                         return PTR_ERR(block_cb);
1658
1659                 flow_block_cb_add(block_cb, f);
1660                 list_add_tail(&block_cb->driver_list, &dsa_user_block_cb_list);
1661                 return 0;
1662         case FLOW_BLOCK_UNBIND:
1663                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1664                 if (!block_cb)
1665                         return -ENOENT;
1666
1667                 flow_block_cb_remove(block_cb, f);
1668                 list_del(&block_cb->driver_list);
1669                 return 0;
1670         default:
1671                 return -EOPNOTSUPP;
1672         }
1673 }
1674
1675 static int dsa_user_setup_ft_block(struct dsa_switch *ds, int port,
1676                                    void *type_data)
1677 {
1678         struct net_device *conduit = dsa_port_to_conduit(dsa_to_port(ds, port));
1679
1680         if (!conduit->netdev_ops->ndo_setup_tc)
1681                 return -EOPNOTSUPP;
1682
1683         return conduit->netdev_ops->ndo_setup_tc(conduit, TC_SETUP_FT, type_data);
1684 }
1685
1686 static int dsa_user_setup_tc(struct net_device *dev, enum tc_setup_type type,
1687                              void *type_data)
1688 {
1689         struct dsa_port *dp = dsa_user_to_port(dev);
1690         struct dsa_switch *ds = dp->ds;
1691
1692         switch (type) {
1693         case TC_SETUP_BLOCK:
1694                 return dsa_user_setup_tc_block(dev, type_data);
1695         case TC_SETUP_FT:
1696                 return dsa_user_setup_ft_block(ds, dp->index, type_data);
1697         default:
1698                 break;
1699         }
1700
1701         if (!ds->ops->port_setup_tc)
1702                 return -EOPNOTSUPP;
1703
1704         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1705 }
1706
1707 static int dsa_user_get_rxnfc(struct net_device *dev,
1708                               struct ethtool_rxnfc *nfc, u32 *rule_locs)
1709 {
1710         struct dsa_port *dp = dsa_user_to_port(dev);
1711         struct dsa_switch *ds = dp->ds;
1712
1713         if (!ds->ops->get_rxnfc)
1714                 return -EOPNOTSUPP;
1715
1716         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1717 }
1718
1719 static int dsa_user_set_rxnfc(struct net_device *dev,
1720                               struct ethtool_rxnfc *nfc)
1721 {
1722         struct dsa_port *dp = dsa_user_to_port(dev);
1723         struct dsa_switch *ds = dp->ds;
1724
1725         if (!ds->ops->set_rxnfc)
1726                 return -EOPNOTSUPP;
1727
1728         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1729 }
1730
1731 static int dsa_user_get_ts_info(struct net_device *dev,
1732                                 struct kernel_ethtool_ts_info *ts)
1733 {
1734         struct dsa_user_priv *p = netdev_priv(dev);
1735         struct dsa_switch *ds = p->dp->ds;
1736
1737         if (!ds->ops->get_ts_info)
1738                 return -EOPNOTSUPP;
1739
1740         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1741 }
1742
1743 static int dsa_user_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1744                                     u16 vid)
1745 {
1746         struct dsa_port *dp = dsa_user_to_port(dev);
1747         struct switchdev_obj_port_vlan vlan = {
1748                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1749                 .vid = vid,
1750                 /* This API only allows programming tagged, non-PVID VIDs */
1751                 .flags = 0,
1752         };
1753         struct netlink_ext_ack extack = {0};
1754         struct dsa_switch *ds = dp->ds;
1755         struct netdev_hw_addr *ha;
1756         struct dsa_vlan *v;
1757         int ret;
1758
1759         /* User port... */
1760         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1761         if (ret) {
1762                 if (extack._msg)
1763                         netdev_err(dev, "%s\n", extack._msg);
1764                 return ret;
1765         }
1766
1767         /* And CPU port... */
1768         ret = dsa_port_host_vlan_add(dp, &vlan, &extack);
1769         if (ret) {
1770                 if (extack._msg)
1771                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1772                                    extack._msg);
1773                 return ret;
1774         }
1775
1776         if (!dsa_switch_supports_uc_filtering(ds) &&
1777             !dsa_switch_supports_mc_filtering(ds))
1778                 return 0;
1779
1780         v = kzalloc(sizeof(*v), GFP_KERNEL);
1781         if (!v) {
1782                 ret = -ENOMEM;
1783                 goto rollback;
1784         }
1785
1786         netif_addr_lock_bh(dev);
1787
1788         v->vid = vid;
1789         list_add_tail(&v->list, &dp->user_vlans);
1790
1791         if (dsa_switch_supports_mc_filtering(ds)) {
1792                 netdev_for_each_synced_mc_addr(ha, dev) {
1793                         dsa_user_schedule_standalone_work(dev, DSA_MC_ADD,
1794                                                           ha->addr, vid);
1795                 }
1796         }
1797
1798         if (dsa_switch_supports_uc_filtering(ds)) {
1799                 netdev_for_each_synced_uc_addr(ha, dev) {
1800                         dsa_user_schedule_standalone_work(dev, DSA_UC_ADD,
1801                                                           ha->addr, vid);
1802                 }
1803         }
1804
1805         netif_addr_unlock_bh(dev);
1806
1807         dsa_flush_workqueue();
1808
1809         return 0;
1810
1811 rollback:
1812         dsa_port_host_vlan_del(dp, &vlan);
1813         dsa_port_vlan_del(dp, &vlan);
1814
1815         return ret;
1816 }
1817
1818 static int dsa_user_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1819                                      u16 vid)
1820 {
1821         struct dsa_port *dp = dsa_user_to_port(dev);
1822         struct switchdev_obj_port_vlan vlan = {
1823                 .vid = vid,
1824                 /* This API only allows programming tagged, non-PVID VIDs */
1825                 .flags = 0,
1826         };
1827         struct dsa_switch *ds = dp->ds;
1828         struct netdev_hw_addr *ha;
1829         struct dsa_vlan *v;
1830         int err;
1831
1832         err = dsa_port_vlan_del(dp, &vlan);
1833         if (err)
1834                 return err;
1835
1836         err = dsa_port_host_vlan_del(dp, &vlan);
1837         if (err)
1838                 return err;
1839
1840         if (!dsa_switch_supports_uc_filtering(ds) &&
1841             !dsa_switch_supports_mc_filtering(ds))
1842                 return 0;
1843
1844         netif_addr_lock_bh(dev);
1845
1846         v = dsa_vlan_find(&dp->user_vlans, &vlan);
1847         if (!v) {
1848                 netif_addr_unlock_bh(dev);
1849                 return -ENOENT;
1850         }
1851
1852         list_del(&v->list);
1853         kfree(v);
1854
1855         if (dsa_switch_supports_mc_filtering(ds)) {
1856                 netdev_for_each_synced_mc_addr(ha, dev) {
1857                         dsa_user_schedule_standalone_work(dev, DSA_MC_DEL,
1858                                                           ha->addr, vid);
1859                 }
1860         }
1861
1862         if (dsa_switch_supports_uc_filtering(ds)) {
1863                 netdev_for_each_synced_uc_addr(ha, dev) {
1864                         dsa_user_schedule_standalone_work(dev, DSA_UC_DEL,
1865                                                           ha->addr, vid);
1866                 }
1867         }
1868
1869         netif_addr_unlock_bh(dev);
1870
1871         dsa_flush_workqueue();
1872
1873         return 0;
1874 }
1875
1876 static int dsa_user_restore_vlan(struct net_device *vdev, int vid, void *arg)
1877 {
1878         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1879
1880         return dsa_user_vlan_rx_add_vid(arg, proto, vid);
1881 }
1882
1883 static int dsa_user_clear_vlan(struct net_device *vdev, int vid, void *arg)
1884 {
1885         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1886
1887         return dsa_user_vlan_rx_kill_vid(arg, proto, vid);
1888 }
1889
1890 /* Keep the VLAN RX filtering list in sync with the hardware only if VLAN
1891  * filtering is enabled. The baseline is that only ports that offload a
1892  * VLAN-aware bridge are VLAN-aware, and standalone ports are VLAN-unaware,
1893  * but there are exceptions for quirky hardware.
1894  *
1895  * If ds->vlan_filtering_is_global = true, then standalone ports which share
1896  * the same switch with other ports that offload a VLAN-aware bridge are also
1897  * inevitably VLAN-aware.
1898  *
1899  * To summarize, a DSA switch port offloads:
1900  *
1901  * - If standalone (this includes software bridge, software LAG):
1902  *     - if ds->needs_standalone_vlan_filtering = true, OR if
1903  *       (ds->vlan_filtering_is_global = true AND there are bridges spanning
1904  *       this switch chip which have vlan_filtering=1)
1905  *         - the 8021q upper VLANs
1906  *     - else (standalone VLAN filtering is not needed, VLAN filtering is not
1907  *       global, or it is, but no port is under a VLAN-aware bridge):
1908  *         - no VLAN (any 8021q upper is a software VLAN)
1909  *
1910  * - If under a vlan_filtering=0 bridge which it offload:
1911  *     - if ds->configure_vlan_while_not_filtering = true (default):
1912  *         - the bridge VLANs. These VLANs are committed to hardware but inactive.
1913  *     - else (deprecated):
1914  *         - no VLAN. The bridge VLANs are not restored when VLAN awareness is
1915  *           enabled, so this behavior is broken and discouraged.
1916  *
1917  * - If under a vlan_filtering=1 bridge which it offload:
1918  *     - the bridge VLANs
1919  *     - the 8021q upper VLANs
1920  */
1921 int dsa_user_manage_vlan_filtering(struct net_device *user,
1922                                    bool vlan_filtering)
1923 {
1924         int err;
1925
1926         if (vlan_filtering) {
1927                 user->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1928
1929                 err = vlan_for_each(user, dsa_user_restore_vlan, user);
1930                 if (err) {
1931                         vlan_for_each(user, dsa_user_clear_vlan, user);
1932                         user->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1933                         return err;
1934                 }
1935         } else {
1936                 err = vlan_for_each(user, dsa_user_clear_vlan, user);
1937                 if (err)
1938                         return err;
1939
1940                 user->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1941         }
1942
1943         return 0;
1944 }
1945
1946 struct dsa_hw_port {
1947         struct list_head list;
1948         struct net_device *dev;
1949         int old_mtu;
1950 };
1951
1952 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1953 {
1954         const struct dsa_hw_port *p;
1955         int err;
1956
1957         list_for_each_entry(p, hw_port_list, list) {
1958                 if (p->dev->mtu == mtu)
1959                         continue;
1960
1961                 err = dev_set_mtu(p->dev, mtu);
1962                 if (err)
1963                         goto rollback;
1964         }
1965
1966         return 0;
1967
1968 rollback:
1969         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1970                 if (p->dev->mtu == p->old_mtu)
1971                         continue;
1972
1973                 if (dev_set_mtu(p->dev, p->old_mtu))
1974                         netdev_err(p->dev, "Failed to restore MTU\n");
1975         }
1976
1977         return err;
1978 }
1979
1980 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1981 {
1982         struct dsa_hw_port *p, *n;
1983
1984         list_for_each_entry_safe(p, n, hw_port_list, list)
1985                 kfree(p);
1986 }
1987
1988 /* Make the hardware datapath to/from @dev limited to a common MTU */
1989 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1990 {
1991         struct list_head hw_port_list;
1992         struct dsa_switch_tree *dst;
1993         int min_mtu = ETH_MAX_MTU;
1994         struct dsa_port *other_dp;
1995         int err;
1996
1997         if (!dp->ds->mtu_enforcement_ingress)
1998                 return;
1999
2000         if (!dp->bridge)
2001                 return;
2002
2003         INIT_LIST_HEAD(&hw_port_list);
2004
2005         /* Populate the list of ports that are part of the same bridge
2006          * as the newly added/modified port
2007          */
2008         list_for_each_entry(dst, &dsa_tree_list, list) {
2009                 list_for_each_entry(other_dp, &dst->ports, list) {
2010                         struct dsa_hw_port *hw_port;
2011                         struct net_device *user;
2012
2013                         if (other_dp->type != DSA_PORT_TYPE_USER)
2014                                 continue;
2015
2016                         if (!dsa_port_bridge_same(dp, other_dp))
2017                                 continue;
2018
2019                         if (!other_dp->ds->mtu_enforcement_ingress)
2020                                 continue;
2021
2022                         user = other_dp->user;
2023
2024                         if (min_mtu > user->mtu)
2025                                 min_mtu = user->mtu;
2026
2027                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
2028                         if (!hw_port)
2029                                 goto out;
2030
2031                         hw_port->dev = user;
2032                         hw_port->old_mtu = user->mtu;
2033
2034                         list_add(&hw_port->list, &hw_port_list);
2035                 }
2036         }
2037
2038         /* Attempt to configure the entire hardware bridge to the newly added
2039          * interface's MTU first, regardless of whether the intention of the
2040          * user was to raise or lower it.
2041          */
2042         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->user->mtu);
2043         if (!err)
2044                 goto out;
2045
2046         /* Clearly that didn't work out so well, so just set the minimum MTU on
2047          * all hardware bridge ports now. If this fails too, then all ports will
2048          * still have their old MTU rolled back anyway.
2049          */
2050         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
2051
2052 out:
2053         dsa_hw_port_list_free(&hw_port_list);
2054 }
2055
2056 int dsa_user_change_mtu(struct net_device *dev, int new_mtu)
2057 {
2058         struct net_device *conduit = dsa_user_to_conduit(dev);
2059         struct dsa_port *dp = dsa_user_to_port(dev);
2060         struct dsa_port *cpu_dp = dp->cpu_dp;
2061         struct dsa_switch *ds = dp->ds;
2062         struct dsa_port *other_dp;
2063         int largest_mtu = 0;
2064         int new_conduit_mtu;
2065         int old_conduit_mtu;
2066         int mtu_limit;
2067         int overhead;
2068         int cpu_mtu;
2069         int err;
2070
2071         if (!ds->ops->port_change_mtu)
2072                 return -EOPNOTSUPP;
2073
2074         dsa_tree_for_each_user_port(other_dp, ds->dst) {
2075                 int user_mtu;
2076
2077                 /* During probe, this function will be called for each user
2078                  * device, while not all of them have been allocated. That's
2079                  * ok, it doesn't change what the maximum is, so ignore it.
2080                  */
2081                 if (!other_dp->user)
2082                         continue;
2083
2084                 /* Pretend that we already applied the setting, which we
2085                  * actually haven't (still haven't done all integrity checks)
2086                  */
2087                 if (dp == other_dp)
2088                         user_mtu = new_mtu;
2089                 else
2090                         user_mtu = other_dp->user->mtu;
2091
2092                 if (largest_mtu < user_mtu)
2093                         largest_mtu = user_mtu;
2094         }
2095
2096         overhead = dsa_tag_protocol_overhead(cpu_dp->tag_ops);
2097         mtu_limit = min_t(int, conduit->max_mtu, dev->max_mtu + overhead);
2098         old_conduit_mtu = conduit->mtu;
2099         new_conduit_mtu = largest_mtu + overhead;
2100         if (new_conduit_mtu > mtu_limit)
2101                 return -ERANGE;
2102
2103         /* If the conduit MTU isn't over limit, there's no need to check the CPU
2104          * MTU, since that surely isn't either.
2105          */
2106         cpu_mtu = largest_mtu;
2107
2108         /* Start applying stuff */
2109         if (new_conduit_mtu != old_conduit_mtu) {
2110                 err = dev_set_mtu(conduit, new_conduit_mtu);
2111                 if (err < 0)
2112                         goto out_conduit_failed;
2113
2114                 /* We only need to propagate the MTU of the CPU port to
2115                  * upstream switches, so emit a notifier which updates them.
2116                  */
2117                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu);
2118                 if (err)
2119                         goto out_cpu_failed;
2120         }
2121
2122         err = ds->ops->port_change_mtu(ds, dp->index, new_mtu);
2123         if (err)
2124                 goto out_port_failed;
2125
2126         WRITE_ONCE(dev->mtu, new_mtu);
2127
2128         dsa_bridge_mtu_normalization(dp);
2129
2130         return 0;
2131
2132 out_port_failed:
2133         if (new_conduit_mtu != old_conduit_mtu)
2134                 dsa_port_mtu_change(cpu_dp, old_conduit_mtu - overhead);
2135 out_cpu_failed:
2136         if (new_conduit_mtu != old_conduit_mtu)
2137                 dev_set_mtu(conduit, old_conduit_mtu);
2138 out_conduit_failed:
2139         return err;
2140 }
2141
2142 static int __maybe_unused
2143 dsa_user_dcbnl_set_apptrust(struct net_device *dev, u8 *sel, int nsel)
2144 {
2145         struct dsa_port *dp = dsa_user_to_port(dev);
2146         struct dsa_switch *ds = dp->ds;
2147         int port = dp->index;
2148
2149         if (!ds->ops->port_set_apptrust)
2150                 return -EOPNOTSUPP;
2151
2152         return ds->ops->port_set_apptrust(ds, port, sel, nsel);
2153 }
2154
2155 static int __maybe_unused
2156 dsa_user_dcbnl_get_apptrust(struct net_device *dev, u8 *sel, int *nsel)
2157 {
2158         struct dsa_port *dp = dsa_user_to_port(dev);
2159         struct dsa_switch *ds = dp->ds;
2160         int port = dp->index;
2161
2162         if (!ds->ops->port_get_apptrust)
2163                 return -EOPNOTSUPP;
2164
2165         return ds->ops->port_get_apptrust(ds, port, sel, nsel);
2166 }
2167
2168 static int __maybe_unused
2169 dsa_user_dcbnl_set_default_prio(struct net_device *dev, struct dcb_app *app)
2170 {
2171         struct dsa_port *dp = dsa_user_to_port(dev);
2172         struct dsa_switch *ds = dp->ds;
2173         unsigned long mask, new_prio;
2174         int err, port = dp->index;
2175
2176         if (!ds->ops->port_set_default_prio)
2177                 return -EOPNOTSUPP;
2178
2179         err = dcb_ieee_setapp(dev, app);
2180         if (err)
2181                 return err;
2182
2183         mask = dcb_ieee_getapp_mask(dev, app);
2184         new_prio = __fls(mask);
2185
2186         err = ds->ops->port_set_default_prio(ds, port, new_prio);
2187         if (err) {
2188                 dcb_ieee_delapp(dev, app);
2189                 return err;
2190         }
2191
2192         return 0;
2193 }
2194
2195 /* Update the DSCP prio entries on all user ports of the switch in case
2196  * the switch supports global DSCP prio instead of per port DSCP prios.
2197  */
2198 static int dsa_user_dcbnl_ieee_global_dscp_setdel(struct net_device *dev,
2199                                                   struct dcb_app *app, bool del)
2200 {
2201         int (*setdel)(struct net_device *dev, struct dcb_app *app);
2202         struct dsa_port *dp = dsa_user_to_port(dev);
2203         struct dsa_switch *ds = dp->ds;
2204         struct dsa_port *other_dp;
2205         int err, restore_err;
2206
2207         if (del)
2208                 setdel = dcb_ieee_delapp;
2209         else
2210                 setdel = dcb_ieee_setapp;
2211
2212         dsa_switch_for_each_user_port(other_dp, ds) {
2213                 struct net_device *user = other_dp->user;
2214
2215                 if (!user || user == dev)
2216                         continue;
2217
2218                 err = setdel(user, app);
2219                 if (err)
2220                         goto err_try_to_restore;
2221         }
2222
2223         return 0;
2224
2225 err_try_to_restore:
2226
2227         /* Revert logic to restore previous state of app entries */
2228         if (!del)
2229                 setdel = dcb_ieee_delapp;
2230         else
2231                 setdel = dcb_ieee_setapp;
2232
2233         dsa_switch_for_each_user_port_continue_reverse(other_dp, ds) {
2234                 struct net_device *user = other_dp->user;
2235
2236                 if (!user || user == dev)
2237                         continue;
2238
2239                 restore_err = setdel(user, app);
2240                 if (restore_err)
2241                         netdev_err(user, "Failed to restore DSCP prio entry configuration\n");
2242         }
2243
2244         return err;
2245 }
2246
2247 static int __maybe_unused
2248 dsa_user_dcbnl_add_dscp_prio(struct net_device *dev, struct dcb_app *app)
2249 {
2250         struct dsa_port *dp = dsa_user_to_port(dev);
2251         struct dsa_switch *ds = dp->ds;
2252         unsigned long mask, new_prio;
2253         int err, port = dp->index;
2254         u8 dscp = app->protocol;
2255
2256         if (!ds->ops->port_add_dscp_prio)
2257                 return -EOPNOTSUPP;
2258
2259         if (dscp >= 64) {
2260                 netdev_err(dev, "DSCP APP entry with protocol value %u is invalid\n",
2261                            dscp);
2262                 return -EINVAL;
2263         }
2264
2265         err = dcb_ieee_setapp(dev, app);
2266         if (err)
2267                 return err;
2268
2269         mask = dcb_ieee_getapp_mask(dev, app);
2270         new_prio = __fls(mask);
2271
2272         err = ds->ops->port_add_dscp_prio(ds, port, dscp, new_prio);
2273         if (err) {
2274                 dcb_ieee_delapp(dev, app);
2275                 return err;
2276         }
2277
2278         if (!ds->dscp_prio_mapping_is_global)
2279                 return 0;
2280
2281         err = dsa_user_dcbnl_ieee_global_dscp_setdel(dev, app, false);
2282         if (err) {
2283                 if (ds->ops->port_del_dscp_prio)
2284                         ds->ops->port_del_dscp_prio(ds, port, dscp, new_prio);
2285                 dcb_ieee_delapp(dev, app);
2286                 return err;
2287         }
2288
2289         return 0;
2290 }
2291
2292 static int __maybe_unused dsa_user_dcbnl_ieee_setapp(struct net_device *dev,
2293                                                      struct dcb_app *app)
2294 {
2295         switch (app->selector) {
2296         case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
2297                 switch (app->protocol) {
2298                 case 0:
2299                         return dsa_user_dcbnl_set_default_prio(dev, app);
2300                 default:
2301                         return -EOPNOTSUPP;
2302                 }
2303                 break;
2304         case IEEE_8021QAZ_APP_SEL_DSCP:
2305                 return dsa_user_dcbnl_add_dscp_prio(dev, app);
2306         default:
2307                 return -EOPNOTSUPP;
2308         }
2309 }
2310
2311 static int __maybe_unused
2312 dsa_user_dcbnl_del_default_prio(struct net_device *dev, struct dcb_app *app)
2313 {
2314         struct dsa_port *dp = dsa_user_to_port(dev);
2315         struct dsa_switch *ds = dp->ds;
2316         unsigned long mask, new_prio;
2317         int err, port = dp->index;
2318
2319         if (!ds->ops->port_set_default_prio)
2320                 return -EOPNOTSUPP;
2321
2322         err = dcb_ieee_delapp(dev, app);
2323         if (err)
2324                 return err;
2325
2326         mask = dcb_ieee_getapp_mask(dev, app);
2327         new_prio = mask ? __fls(mask) : 0;
2328
2329         err = ds->ops->port_set_default_prio(ds, port, new_prio);
2330         if (err) {
2331                 dcb_ieee_setapp(dev, app);
2332                 return err;
2333         }
2334
2335         return 0;
2336 }
2337
2338 static int __maybe_unused
2339 dsa_user_dcbnl_del_dscp_prio(struct net_device *dev, struct dcb_app *app)
2340 {
2341         struct dsa_port *dp = dsa_user_to_port(dev);
2342         struct dsa_switch *ds = dp->ds;
2343         int err, port = dp->index;
2344         u8 dscp = app->protocol;
2345
2346         if (!ds->ops->port_del_dscp_prio)
2347                 return -EOPNOTSUPP;
2348
2349         err = dcb_ieee_delapp(dev, app);
2350         if (err)
2351                 return err;
2352
2353         err = ds->ops->port_del_dscp_prio(ds, port, dscp, app->priority);
2354         if (err) {
2355                 dcb_ieee_setapp(dev, app);
2356                 return err;
2357         }
2358
2359         if (!ds->dscp_prio_mapping_is_global)
2360                 return 0;
2361
2362         err = dsa_user_dcbnl_ieee_global_dscp_setdel(dev, app, true);
2363         if (err) {
2364                 if (ds->ops->port_add_dscp_prio)
2365                         ds->ops->port_add_dscp_prio(ds, port, dscp,
2366                                                     app->priority);
2367                 dcb_ieee_setapp(dev, app);
2368                 return err;
2369         }
2370
2371         return 0;
2372 }
2373
2374 static int __maybe_unused dsa_user_dcbnl_ieee_delapp(struct net_device *dev,
2375                                                      struct dcb_app *app)
2376 {
2377         switch (app->selector) {
2378         case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
2379                 switch (app->protocol) {
2380                 case 0:
2381                         return dsa_user_dcbnl_del_default_prio(dev, app);
2382                 default:
2383                         return -EOPNOTSUPP;
2384                 }
2385                 break;
2386         case IEEE_8021QAZ_APP_SEL_DSCP:
2387                 return dsa_user_dcbnl_del_dscp_prio(dev, app);
2388         default:
2389                 return -EOPNOTSUPP;
2390         }
2391 }
2392
2393 /* Pre-populate the DCB application priority table with the priorities
2394  * configured during switch setup, which we read from hardware here.
2395  */
2396 static int dsa_user_dcbnl_init(struct net_device *dev)
2397 {
2398         struct dsa_port *dp = dsa_user_to_port(dev);
2399         struct dsa_switch *ds = dp->ds;
2400         int port = dp->index;
2401         int err;
2402
2403         if (ds->ops->port_get_default_prio) {
2404                 int prio = ds->ops->port_get_default_prio(ds, port);
2405                 struct dcb_app app = {
2406                         .selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE,
2407                         .protocol = 0,
2408                         .priority = prio,
2409                 };
2410
2411                 if (prio < 0)
2412                         return prio;
2413
2414                 err = dcb_ieee_setapp(dev, &app);
2415                 if (err)
2416                         return err;
2417         }
2418
2419         if (ds->ops->port_get_dscp_prio) {
2420                 int protocol;
2421
2422                 for (protocol = 0; protocol < 64; protocol++) {
2423                         struct dcb_app app = {
2424                                 .selector = IEEE_8021QAZ_APP_SEL_DSCP,
2425                                 .protocol = protocol,
2426                         };
2427                         int prio;
2428
2429                         prio = ds->ops->port_get_dscp_prio(ds, port, protocol);
2430                         if (prio == -EOPNOTSUPP)
2431                                 continue;
2432                         if (prio < 0)
2433                                 return prio;
2434
2435                         app.priority = prio;
2436
2437                         err = dcb_ieee_setapp(dev, &app);
2438                         if (err)
2439                                 return err;
2440                 }
2441         }
2442
2443         return 0;
2444 }
2445
2446 static const struct ethtool_ops dsa_user_ethtool_ops = {
2447         .get_drvinfo            = dsa_user_get_drvinfo,
2448         .get_regs_len           = dsa_user_get_regs_len,
2449         .get_regs               = dsa_user_get_regs,
2450         .nway_reset             = dsa_user_nway_reset,
2451         .get_link               = ethtool_op_get_link,
2452         .get_eeprom_len         = dsa_user_get_eeprom_len,
2453         .get_eeprom             = dsa_user_get_eeprom,
2454         .set_eeprom             = dsa_user_set_eeprom,
2455         .get_strings            = dsa_user_get_strings,
2456         .get_ethtool_stats      = dsa_user_get_ethtool_stats,
2457         .get_sset_count         = dsa_user_get_sset_count,
2458         .get_eth_phy_stats      = dsa_user_get_eth_phy_stats,
2459         .get_eth_mac_stats      = dsa_user_get_eth_mac_stats,
2460         .get_eth_ctrl_stats     = dsa_user_get_eth_ctrl_stats,
2461         .get_rmon_stats         = dsa_user_get_rmon_stats,
2462         .set_wol                = dsa_user_set_wol,
2463         .get_wol                = dsa_user_get_wol,
2464         .set_eee                = dsa_user_set_eee,
2465         .get_eee                = dsa_user_get_eee,
2466         .get_link_ksettings     = dsa_user_get_link_ksettings,
2467         .set_link_ksettings     = dsa_user_set_link_ksettings,
2468         .get_pause_stats        = dsa_user_get_pause_stats,
2469         .get_pauseparam         = dsa_user_get_pauseparam,
2470         .set_pauseparam         = dsa_user_set_pauseparam,
2471         .get_rxnfc              = dsa_user_get_rxnfc,
2472         .set_rxnfc              = dsa_user_set_rxnfc,
2473         .get_ts_info            = dsa_user_get_ts_info,
2474         .self_test              = dsa_user_net_selftest,
2475         .get_mm                 = dsa_user_get_mm,
2476         .set_mm                 = dsa_user_set_mm,
2477         .get_mm_stats           = dsa_user_get_mm_stats,
2478 };
2479
2480 static const struct dcbnl_rtnl_ops __maybe_unused dsa_user_dcbnl_ops = {
2481         .ieee_setapp            = dsa_user_dcbnl_ieee_setapp,
2482         .ieee_delapp            = dsa_user_dcbnl_ieee_delapp,
2483         .dcbnl_setapptrust      = dsa_user_dcbnl_set_apptrust,
2484         .dcbnl_getapptrust      = dsa_user_dcbnl_get_apptrust,
2485 };
2486
2487 static void dsa_user_get_stats64(struct net_device *dev,
2488                                  struct rtnl_link_stats64 *s)
2489 {
2490         struct dsa_port *dp = dsa_user_to_port(dev);
2491         struct dsa_switch *ds = dp->ds;
2492
2493         if (ds->ops->get_stats64)
2494                 ds->ops->get_stats64(ds, dp->index, s);
2495         else
2496                 dev_get_tstats64(dev, s);
2497 }
2498
2499 static int dsa_user_fill_forward_path(struct net_device_path_ctx *ctx,
2500                                       struct net_device_path *path)
2501 {
2502         struct dsa_port *dp = dsa_user_to_port(ctx->dev);
2503         struct net_device *conduit = dsa_port_to_conduit(dp);
2504         struct dsa_port *cpu_dp = dp->cpu_dp;
2505
2506         path->dev = ctx->dev;
2507         path->type = DEV_PATH_DSA;
2508         path->dsa.proto = cpu_dp->tag_ops->proto;
2509         path->dsa.port = dp->index;
2510         ctx->dev = conduit;
2511
2512         return 0;
2513 }
2514
2515 static const struct net_device_ops dsa_user_netdev_ops = {
2516         .ndo_open               = dsa_user_open,
2517         .ndo_stop               = dsa_user_close,
2518         .ndo_start_xmit         = dsa_user_xmit,
2519         .ndo_change_rx_flags    = dsa_user_change_rx_flags,
2520         .ndo_set_rx_mode        = dsa_user_set_rx_mode,
2521         .ndo_set_mac_address    = dsa_user_set_mac_address,
2522         .ndo_fdb_dump           = dsa_user_fdb_dump,
2523         .ndo_eth_ioctl          = dsa_user_ioctl,
2524         .ndo_get_iflink         = dsa_user_get_iflink,
2525 #ifdef CONFIG_NET_POLL_CONTROLLER
2526         .ndo_netpoll_setup      = dsa_user_netpoll_setup,
2527         .ndo_netpoll_cleanup    = dsa_user_netpoll_cleanup,
2528         .ndo_poll_controller    = dsa_user_poll_controller,
2529 #endif
2530         .ndo_setup_tc           = dsa_user_setup_tc,
2531         .ndo_get_stats64        = dsa_user_get_stats64,
2532         .ndo_vlan_rx_add_vid    = dsa_user_vlan_rx_add_vid,
2533         .ndo_vlan_rx_kill_vid   = dsa_user_vlan_rx_kill_vid,
2534         .ndo_change_mtu         = dsa_user_change_mtu,
2535         .ndo_fill_forward_path  = dsa_user_fill_forward_path,
2536 };
2537
2538 static const struct device_type dsa_type = {
2539         .name   = "dsa",
2540 };
2541
2542 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
2543 {
2544         const struct dsa_port *dp = dsa_to_port(ds, port);
2545
2546         if (dp->pl)
2547                 phylink_mac_change(dp->pl, up);
2548 }
2549 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
2550
2551 static void dsa_user_phylink_fixed_state(struct phylink_config *config,
2552                                          struct phylink_link_state *state)
2553 {
2554         struct dsa_port *dp = dsa_phylink_to_port(config);
2555         struct dsa_switch *ds = dp->ds;
2556
2557         /* No need to check that this operation is valid, the callback would
2558          * not be called if it was not.
2559          */
2560         ds->ops->phylink_fixed_state(ds, dp->index, state);
2561 }
2562
2563 /* user device setup *******************************************************/
2564 static int dsa_user_phy_connect(struct net_device *user_dev, int addr,
2565                                 u32 flags)
2566 {
2567         struct dsa_port *dp = dsa_user_to_port(user_dev);
2568         struct dsa_switch *ds = dp->ds;
2569
2570         user_dev->phydev = mdiobus_get_phy(ds->user_mii_bus, addr);
2571         if (!user_dev->phydev) {
2572                 netdev_err(user_dev, "no phy at %d\n", addr);
2573                 return -ENODEV;
2574         }
2575
2576         user_dev->phydev->dev_flags |= flags;
2577
2578         return phylink_connect_phy(dp->pl, user_dev->phydev);
2579 }
2580
2581 static int dsa_user_phy_setup(struct net_device *user_dev)
2582 {
2583         struct dsa_port *dp = dsa_user_to_port(user_dev);
2584         struct device_node *port_dn = dp->dn;
2585         struct dsa_switch *ds = dp->ds;
2586         u32 phy_flags = 0;
2587         int ret;
2588
2589         dp->pl_config.dev = &user_dev->dev;
2590         dp->pl_config.type = PHYLINK_NETDEV;
2591
2592         /* The get_fixed_state callback takes precedence over polling the
2593          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
2594          * this if the switch provides such a callback.
2595          */
2596         if (ds->ops->phylink_fixed_state) {
2597                 dp->pl_config.get_fixed_state = dsa_user_phylink_fixed_state;
2598                 dp->pl_config.poll_fixed_state = true;
2599         }
2600
2601         ret = dsa_port_phylink_create(dp);
2602         if (ret)
2603                 return ret;
2604
2605         if (ds->ops->get_phy_flags)
2606                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
2607
2608         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
2609         if (ret == -ENODEV && ds->user_mii_bus) {
2610                 /* We could not connect to a designated PHY or SFP, so try to
2611                  * use the switch internal MDIO bus instead
2612                  */
2613                 ret = dsa_user_phy_connect(user_dev, dp->index, phy_flags);
2614         }
2615         if (ret) {
2616                 netdev_err(user_dev, "failed to connect to PHY: %pe\n",
2617                            ERR_PTR(ret));
2618                 dsa_port_phylink_destroy(dp);
2619         }
2620
2621         return ret;
2622 }
2623
2624 void dsa_user_setup_tagger(struct net_device *user)
2625 {
2626         struct dsa_port *dp = dsa_user_to_port(user);
2627         struct net_device *conduit = dsa_port_to_conduit(dp);
2628         struct dsa_user_priv *p = netdev_priv(user);
2629         const struct dsa_port *cpu_dp = dp->cpu_dp;
2630         const struct dsa_switch *ds = dp->ds;
2631
2632         user->needed_headroom = cpu_dp->tag_ops->needed_headroom;
2633         user->needed_tailroom = cpu_dp->tag_ops->needed_tailroom;
2634         /* Try to save one extra realloc later in the TX path (in the conduit)
2635          * by also inheriting the conduit's needed headroom and tailroom.
2636          * The 8021q driver also does this.
2637          */
2638         user->needed_headroom += conduit->needed_headroom;
2639         user->needed_tailroom += conduit->needed_tailroom;
2640
2641         p->xmit = cpu_dp->tag_ops->xmit;
2642
2643         user->features = conduit->vlan_features | NETIF_F_HW_TC;
2644         user->hw_features |= NETIF_F_HW_TC;
2645         if (user->needed_tailroom)
2646                 user->features &= ~(NETIF_F_SG | NETIF_F_FRAGLIST);
2647         if (ds->needs_standalone_vlan_filtering)
2648                 user->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2649
2650         user->lltx = true;
2651 }
2652
2653 int dsa_user_suspend(struct net_device *user_dev)
2654 {
2655         struct dsa_port *dp = dsa_user_to_port(user_dev);
2656
2657         if (!netif_running(user_dev))
2658                 return 0;
2659
2660         netif_device_detach(user_dev);
2661
2662         rtnl_lock();
2663         phylink_stop(dp->pl);
2664         rtnl_unlock();
2665
2666         return 0;
2667 }
2668
2669 int dsa_user_resume(struct net_device *user_dev)
2670 {
2671         struct dsa_port *dp = dsa_user_to_port(user_dev);
2672
2673         if (!netif_running(user_dev))
2674                 return 0;
2675
2676         netif_device_attach(user_dev);
2677
2678         rtnl_lock();
2679         phylink_start(dp->pl);
2680         rtnl_unlock();
2681
2682         return 0;
2683 }
2684
2685 int dsa_user_create(struct dsa_port *port)
2686 {
2687         struct net_device *conduit = dsa_port_to_conduit(port);
2688         struct dsa_switch *ds = port->ds;
2689         struct net_device *user_dev;
2690         struct dsa_user_priv *p;
2691         const char *name;
2692         int assign_type;
2693         int ret;
2694
2695         if (!ds->num_tx_queues)
2696                 ds->num_tx_queues = 1;
2697
2698         if (port->name) {
2699                 name = port->name;
2700                 assign_type = NET_NAME_PREDICTABLE;
2701         } else {
2702                 name = "eth%d";
2703                 assign_type = NET_NAME_ENUM;
2704         }
2705
2706         user_dev = alloc_netdev_mqs(sizeof(struct dsa_user_priv), name,
2707                                     assign_type, ether_setup,
2708                                     ds->num_tx_queues, 1);
2709         if (user_dev == NULL)
2710                 return -ENOMEM;
2711
2712         user_dev->rtnl_link_ops = &dsa_link_ops;
2713         user_dev->ethtool_ops = &dsa_user_ethtool_ops;
2714 #if IS_ENABLED(CONFIG_DCB)
2715         user_dev->dcbnl_ops = &dsa_user_dcbnl_ops;
2716 #endif
2717         if (!is_zero_ether_addr(port->mac))
2718                 eth_hw_addr_set(user_dev, port->mac);
2719         else
2720                 eth_hw_addr_inherit(user_dev, conduit);
2721         user_dev->priv_flags |= IFF_NO_QUEUE;
2722         if (dsa_switch_supports_uc_filtering(ds))
2723                 user_dev->priv_flags |= IFF_UNICAST_FLT;
2724         user_dev->netdev_ops = &dsa_user_netdev_ops;
2725         if (ds->ops->port_max_mtu)
2726                 user_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
2727         SET_NETDEV_DEVTYPE(user_dev, &dsa_type);
2728
2729         SET_NETDEV_DEV(user_dev, port->ds->dev);
2730         SET_NETDEV_DEVLINK_PORT(user_dev, &port->devlink_port);
2731         user_dev->dev.of_node = port->dn;
2732         user_dev->vlan_features = conduit->vlan_features;
2733
2734         p = netdev_priv(user_dev);
2735         user_dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2736
2737         ret = gro_cells_init(&p->gcells, user_dev);
2738         if (ret)
2739                 goto out_free;
2740
2741         p->dp = port;
2742         INIT_LIST_HEAD(&p->mall_tc_list);
2743         port->user = user_dev;
2744         dsa_user_setup_tagger(user_dev);
2745
2746         netif_carrier_off(user_dev);
2747
2748         ret = dsa_user_phy_setup(user_dev);
2749         if (ret) {
2750                 netdev_err(user_dev,
2751                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
2752                            ret, ds->dst->index, ds->index, port->index);
2753                 goto out_gcells;
2754         }
2755
2756         rtnl_lock();
2757
2758         ret = dsa_user_change_mtu(user_dev, ETH_DATA_LEN);
2759         if (ret && ret != -EOPNOTSUPP)
2760                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
2761                          ret, ETH_DATA_LEN, port->index);
2762
2763         ret = register_netdevice(user_dev);
2764         if (ret) {
2765                 netdev_err(conduit, "error %d registering interface %s\n",
2766                            ret, user_dev->name);
2767                 rtnl_unlock();
2768                 goto out_phy;
2769         }
2770
2771         if (IS_ENABLED(CONFIG_DCB)) {
2772                 ret = dsa_user_dcbnl_init(user_dev);
2773                 if (ret) {
2774                         netdev_err(user_dev,
2775                                    "failed to initialize DCB: %pe\n",
2776                                    ERR_PTR(ret));
2777                         rtnl_unlock();
2778                         goto out_unregister;
2779                 }
2780         }
2781
2782         ret = netdev_upper_dev_link(conduit, user_dev, NULL);
2783
2784         rtnl_unlock();
2785
2786         if (ret)
2787                 goto out_unregister;
2788
2789         return 0;
2790
2791 out_unregister:
2792         unregister_netdev(user_dev);
2793 out_phy:
2794         rtnl_lock();
2795         phylink_disconnect_phy(p->dp->pl);
2796         rtnl_unlock();
2797         dsa_port_phylink_destroy(p->dp);
2798 out_gcells:
2799         gro_cells_destroy(&p->gcells);
2800 out_free:
2801         free_netdev(user_dev);
2802         port->user = NULL;
2803         return ret;
2804 }
2805
2806 void dsa_user_destroy(struct net_device *user_dev)
2807 {
2808         struct net_device *conduit = dsa_user_to_conduit(user_dev);
2809         struct dsa_port *dp = dsa_user_to_port(user_dev);
2810         struct dsa_user_priv *p = netdev_priv(user_dev);
2811
2812         netif_carrier_off(user_dev);
2813         rtnl_lock();
2814         netdev_upper_dev_unlink(conduit, user_dev);
2815         unregister_netdevice(user_dev);
2816         phylink_disconnect_phy(dp->pl);
2817         rtnl_unlock();
2818
2819         dsa_port_phylink_destroy(dp);
2820         gro_cells_destroy(&p->gcells);
2821         free_netdev(user_dev);
2822 }
2823
2824 int dsa_user_change_conduit(struct net_device *dev, struct net_device *conduit,
2825                             struct netlink_ext_ack *extack)
2826 {
2827         struct net_device *old_conduit = dsa_user_to_conduit(dev);
2828         struct dsa_port *dp = dsa_user_to_port(dev);
2829         struct dsa_switch *ds = dp->ds;
2830         struct net_device *upper;
2831         struct list_head *iter;
2832         int err;
2833
2834         if (conduit == old_conduit)
2835                 return 0;
2836
2837         if (!ds->ops->port_change_conduit) {
2838                 NL_SET_ERR_MSG_MOD(extack,
2839                                    "Driver does not support changing DSA conduit");
2840                 return -EOPNOTSUPP;
2841         }
2842
2843         if (!netdev_uses_dsa(conduit)) {
2844                 NL_SET_ERR_MSG_MOD(extack,
2845                                    "Interface not eligible as DSA conduit");
2846                 return -EOPNOTSUPP;
2847         }
2848
2849         netdev_for_each_upper_dev_rcu(conduit, upper, iter) {
2850                 if (dsa_user_dev_check(upper))
2851                         continue;
2852                 if (netif_is_bridge_master(upper))
2853                         continue;
2854                 NL_SET_ERR_MSG_MOD(extack, "Cannot join conduit with unknown uppers");
2855                 return -EOPNOTSUPP;
2856         }
2857
2858         /* Since we allow live-changing the DSA conduit, plus we auto-open the
2859          * DSA conduit when the user port opens => we need to ensure that the
2860          * new DSA conduit is open too.
2861          */
2862         if (dev->flags & IFF_UP) {
2863                 err = dev_open(conduit, extack);
2864                 if (err)
2865                         return err;
2866         }
2867
2868         netdev_upper_dev_unlink(old_conduit, dev);
2869
2870         err = netdev_upper_dev_link(conduit, dev, extack);
2871         if (err)
2872                 goto out_revert_old_conduit_unlink;
2873
2874         err = dsa_port_change_conduit(dp, conduit, extack);
2875         if (err)
2876                 goto out_revert_conduit_link;
2877
2878         /* Update the MTU of the new CPU port through cross-chip notifiers */
2879         err = dsa_user_change_mtu(dev, dev->mtu);
2880         if (err && err != -EOPNOTSUPP) {
2881                 netdev_warn(dev,
2882                             "nonfatal error updating MTU with new conduit: %pe\n",
2883                             ERR_PTR(err));
2884         }
2885
2886         return 0;
2887
2888 out_revert_conduit_link:
2889         netdev_upper_dev_unlink(conduit, dev);
2890 out_revert_old_conduit_unlink:
2891         netdev_upper_dev_link(old_conduit, dev, NULL);
2892         return err;
2893 }
2894
2895 bool dsa_user_dev_check(const struct net_device *dev)
2896 {
2897         return dev->netdev_ops == &dsa_user_netdev_ops;
2898 }
2899 EXPORT_SYMBOL_GPL(dsa_user_dev_check);
2900
2901 static int dsa_user_changeupper(struct net_device *dev,
2902                                 struct netdev_notifier_changeupper_info *info)
2903 {
2904         struct netlink_ext_ack *extack;
2905         int err = NOTIFY_DONE;
2906         struct dsa_port *dp;
2907
2908         if (!dsa_user_dev_check(dev))
2909                 return err;
2910
2911         dp = dsa_user_to_port(dev);
2912         extack = netdev_notifier_info_to_extack(&info->info);
2913
2914         if (netif_is_bridge_master(info->upper_dev)) {
2915                 if (info->linking) {
2916                         err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2917                         if (!err)
2918                                 dsa_bridge_mtu_normalization(dp);
2919                         if (err == -EOPNOTSUPP) {
2920                                 NL_SET_ERR_MSG_WEAK_MOD(extack,
2921                                                         "Offloading not supported");
2922                                 err = 0;
2923                         }
2924                         err = notifier_from_errno(err);
2925                 } else {
2926                         dsa_port_bridge_leave(dp, info->upper_dev);
2927                         err = NOTIFY_OK;
2928                 }
2929         } else if (netif_is_lag_master(info->upper_dev)) {
2930                 if (info->linking) {
2931                         err = dsa_port_lag_join(dp, info->upper_dev,
2932                                                 info->upper_info, extack);
2933                         if (err == -EOPNOTSUPP) {
2934                                 NL_SET_ERR_MSG_WEAK_MOD(extack,
2935                                                         "Offloading not supported");
2936                                 err = 0;
2937                         }
2938                         err = notifier_from_errno(err);
2939                 } else {
2940                         dsa_port_lag_leave(dp, info->upper_dev);
2941                         err = NOTIFY_OK;
2942                 }
2943         } else if (is_hsr_master(info->upper_dev)) {
2944                 if (info->linking) {
2945                         err = dsa_port_hsr_join(dp, info->upper_dev, extack);
2946                         if (err == -EOPNOTSUPP) {
2947                                 NL_SET_ERR_MSG_WEAK_MOD(extack,
2948                                                         "Offloading not supported");
2949                                 err = 0;
2950                         }
2951                         err = notifier_from_errno(err);
2952                 } else {
2953                         dsa_port_hsr_leave(dp, info->upper_dev);
2954                         err = NOTIFY_OK;
2955                 }
2956         }
2957
2958         return err;
2959 }
2960
2961 static int dsa_user_prechangeupper(struct net_device *dev,
2962                                    struct netdev_notifier_changeupper_info *info)
2963 {
2964         struct dsa_port *dp;
2965
2966         if (!dsa_user_dev_check(dev))
2967                 return NOTIFY_DONE;
2968
2969         dp = dsa_user_to_port(dev);
2970
2971         if (netif_is_bridge_master(info->upper_dev) && !info->linking)
2972                 dsa_port_pre_bridge_leave(dp, info->upper_dev);
2973         else if (netif_is_lag_master(info->upper_dev) && !info->linking)
2974                 dsa_port_pre_lag_leave(dp, info->upper_dev);
2975         /* dsa_port_pre_hsr_leave is not yet necessary since hsr devices cannot
2976          * meaningfully placed under a bridge yet
2977          */
2978
2979         return NOTIFY_DONE;
2980 }
2981
2982 static int
2983 dsa_user_lag_changeupper(struct net_device *dev,
2984                          struct netdev_notifier_changeupper_info *info)
2985 {
2986         struct net_device *lower;
2987         struct list_head *iter;
2988         int err = NOTIFY_DONE;
2989         struct dsa_port *dp;
2990
2991         if (!netif_is_lag_master(dev))
2992                 return err;
2993
2994         netdev_for_each_lower_dev(dev, lower, iter) {
2995                 if (!dsa_user_dev_check(lower))
2996                         continue;
2997
2998                 dp = dsa_user_to_port(lower);
2999                 if (!dp->lag)
3000                         /* Software LAG */
3001                         continue;
3002
3003                 err = dsa_user_changeupper(lower, info);
3004                 if (notifier_to_errno(err))
3005                         break;
3006         }
3007
3008         return err;
3009 }
3010
3011 /* Same as dsa_user_lag_changeupper() except that it calls
3012  * dsa_user_prechangeupper()
3013  */
3014 static int
3015 dsa_user_lag_prechangeupper(struct net_device *dev,
3016                             struct netdev_notifier_changeupper_info *info)
3017 {
3018         struct net_device *lower;
3019         struct list_head *iter;
3020         int err = NOTIFY_DONE;
3021         struct dsa_port *dp;
3022
3023         if (!netif_is_lag_master(dev))
3024                 return err;
3025
3026         netdev_for_each_lower_dev(dev, lower, iter) {
3027                 if (!dsa_user_dev_check(lower))
3028                         continue;
3029
3030                 dp = dsa_user_to_port(lower);
3031                 if (!dp->lag)
3032                         /* Software LAG */
3033                         continue;
3034
3035                 err = dsa_user_prechangeupper(lower, info);
3036                 if (notifier_to_errno(err))
3037                         break;
3038         }
3039
3040         return err;
3041 }
3042
3043 static int
3044 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
3045                                  struct netdev_notifier_changeupper_info *info)
3046 {
3047         struct netlink_ext_ack *ext_ack;
3048         struct net_device *user, *br;
3049         struct dsa_port *dp;
3050
3051         ext_ack = netdev_notifier_info_to_extack(&info->info);
3052
3053         if (!is_vlan_dev(dev))
3054                 return NOTIFY_DONE;
3055
3056         user = vlan_dev_real_dev(dev);
3057         if (!dsa_user_dev_check(user))
3058                 return NOTIFY_DONE;
3059
3060         dp = dsa_user_to_port(user);
3061         br = dsa_port_bridge_dev_get(dp);
3062         if (!br)
3063                 return NOTIFY_DONE;
3064
3065         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
3066         if (br_vlan_enabled(br) &&
3067             netif_is_bridge_master(info->upper_dev) && info->linking) {
3068                 NL_SET_ERR_MSG_MOD(ext_ack,
3069                                    "Cannot make VLAN device join VLAN-aware bridge");
3070                 return notifier_from_errno(-EINVAL);
3071         }
3072
3073         return NOTIFY_DONE;
3074 }
3075
3076 static int
3077 dsa_user_check_8021q_upper(struct net_device *dev,
3078                            struct netdev_notifier_changeupper_info *info)
3079 {
3080         struct dsa_port *dp = dsa_user_to_port(dev);
3081         struct net_device *br = dsa_port_bridge_dev_get(dp);
3082         struct bridge_vlan_info br_info;
3083         struct netlink_ext_ack *extack;
3084         int err = NOTIFY_DONE;
3085         u16 vid;
3086
3087         if (!br || !br_vlan_enabled(br))
3088                 return NOTIFY_DONE;
3089
3090         extack = netdev_notifier_info_to_extack(&info->info);
3091         vid = vlan_dev_vlan_id(info->upper_dev);
3092
3093         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
3094          * device, respectively the VID is not found, returning
3095          * 0 means success, which is a failure for us here.
3096          */
3097         err = br_vlan_get_info(br, vid, &br_info);
3098         if (err == 0) {
3099                 NL_SET_ERR_MSG_MOD(extack,
3100                                    "This VLAN is already configured by the bridge");
3101                 return notifier_from_errno(-EBUSY);
3102         }
3103
3104         return NOTIFY_DONE;
3105 }
3106
3107 static int
3108 dsa_user_prechangeupper_sanity_check(struct net_device *dev,
3109                                      struct netdev_notifier_changeupper_info *info)
3110 {
3111         struct dsa_switch *ds;
3112         struct dsa_port *dp;
3113         int err;
3114
3115         if (!dsa_user_dev_check(dev))
3116                 return dsa_prevent_bridging_8021q_upper(dev, info);
3117
3118         dp = dsa_user_to_port(dev);
3119         ds = dp->ds;
3120
3121         if (ds->ops->port_prechangeupper) {
3122                 err = ds->ops->port_prechangeupper(ds, dp->index, info);
3123                 if (err)
3124                         return notifier_from_errno(err);
3125         }
3126
3127         if (is_vlan_dev(info->upper_dev))
3128                 return dsa_user_check_8021q_upper(dev, info);
3129
3130         return NOTIFY_DONE;
3131 }
3132
3133 /* To be eligible as a DSA conduit, a LAG must have all lower interfaces be
3134  * eligible DSA conduits. Additionally, all LAG slaves must be DSA conduits of
3135  * switches in the same switch tree.
3136  */
3137 static int dsa_lag_conduit_validate(struct net_device *lag_dev,
3138                                     struct netlink_ext_ack *extack)
3139 {
3140         struct net_device *lower1, *lower2;
3141         struct list_head *iter1, *iter2;
3142
3143         netdev_for_each_lower_dev(lag_dev, lower1, iter1) {
3144                 netdev_for_each_lower_dev(lag_dev, lower2, iter2) {
3145                         if (!netdev_uses_dsa(lower1) ||
3146                             !netdev_uses_dsa(lower2)) {
3147                                 NL_SET_ERR_MSG_MOD(extack,
3148                                                    "All LAG ports must be eligible as DSA conduits");
3149                                 return notifier_from_errno(-EINVAL);
3150                         }
3151
3152                         if (lower1 == lower2)
3153                                 continue;
3154
3155                         if (!dsa_port_tree_same(lower1->dsa_ptr,
3156                                                 lower2->dsa_ptr)) {
3157                                 NL_SET_ERR_MSG_MOD(extack,
3158                                                    "LAG contains DSA conduits of disjoint switch trees");
3159                                 return notifier_from_errno(-EINVAL);
3160                         }
3161                 }
3162         }
3163
3164         return NOTIFY_DONE;
3165 }
3166
3167 static int
3168 dsa_conduit_prechangeupper_sanity_check(struct net_device *conduit,
3169                                         struct netdev_notifier_changeupper_info *info)
3170 {
3171         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(&info->info);
3172
3173         if (!netdev_uses_dsa(conduit))
3174                 return NOTIFY_DONE;
3175
3176         if (!info->linking)
3177                 return NOTIFY_DONE;
3178
3179         /* Allow DSA switch uppers */
3180         if (dsa_user_dev_check(info->upper_dev))
3181                 return NOTIFY_DONE;
3182
3183         /* Allow bridge uppers of DSA conduits, subject to further
3184          * restrictions in dsa_bridge_prechangelower_sanity_check()
3185          */
3186         if (netif_is_bridge_master(info->upper_dev))
3187                 return NOTIFY_DONE;
3188
3189         /* Allow LAG uppers, subject to further restrictions in
3190          * dsa_lag_conduit_prechangelower_sanity_check()
3191          */
3192         if (netif_is_lag_master(info->upper_dev))
3193                 return dsa_lag_conduit_validate(info->upper_dev, extack);
3194
3195         NL_SET_ERR_MSG_MOD(extack,
3196                            "DSA conduit cannot join unknown upper interfaces");
3197         return notifier_from_errno(-EBUSY);
3198 }
3199
3200 static int
3201 dsa_lag_conduit_prechangelower_sanity_check(struct net_device *dev,
3202                                             struct netdev_notifier_changeupper_info *info)
3203 {
3204         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(&info->info);
3205         struct net_device *lag_dev = info->upper_dev;
3206         struct net_device *lower;
3207         struct list_head *iter;
3208
3209         if (!netdev_uses_dsa(lag_dev) || !netif_is_lag_master(lag_dev))
3210                 return NOTIFY_DONE;
3211
3212         if (!info->linking)
3213                 return NOTIFY_DONE;
3214
3215         if (!netdev_uses_dsa(dev)) {
3216                 NL_SET_ERR_MSG(extack,
3217                                "Only DSA conduits can join a LAG DSA conduit");
3218                 return notifier_from_errno(-EINVAL);
3219         }
3220
3221         netdev_for_each_lower_dev(lag_dev, lower, iter) {
3222                 if (!dsa_port_tree_same(dev->dsa_ptr, lower->dsa_ptr)) {
3223                         NL_SET_ERR_MSG(extack,
3224                                        "Interface is DSA conduit for a different switch tree than this LAG");
3225                         return notifier_from_errno(-EINVAL);
3226                 }
3227
3228                 break;
3229         }
3230
3231         return NOTIFY_DONE;
3232 }
3233
3234 /* Don't allow bridging of DSA conduits, since the bridge layer rx_handler
3235  * prevents the DSA fake ethertype handler to be invoked, so we don't get the
3236  * chance to strip off and parse the DSA switch tag protocol header (the bridge
3237  * layer just returns RX_HANDLER_CONSUMED, stopping RX processing for these
3238  * frames).
3239  * The only case where that would not be an issue is when bridging can already
3240  * be offloaded, such as when the DSA conduit is itself a DSA or plain switchdev
3241  * port, and is bridged only with other ports from the same hardware device.
3242  */
3243 static int
3244 dsa_bridge_prechangelower_sanity_check(struct net_device *new_lower,
3245                                        struct netdev_notifier_changeupper_info *info)
3246 {
3247         struct net_device *br = info->upper_dev;
3248         struct netlink_ext_ack *extack;
3249         struct net_device *lower;
3250         struct list_head *iter;
3251
3252         if (!netif_is_bridge_master(br))
3253                 return NOTIFY_DONE;
3254
3255         if (!info->linking)
3256                 return NOTIFY_DONE;
3257
3258         extack = netdev_notifier_info_to_extack(&info->info);
3259
3260         netdev_for_each_lower_dev(br, lower, iter) {
3261                 if (!netdev_uses_dsa(new_lower) && !netdev_uses_dsa(lower))
3262                         continue;
3263
3264                 if (!netdev_port_same_parent_id(lower, new_lower)) {
3265                         NL_SET_ERR_MSG(extack,
3266                                        "Cannot do software bridging with a DSA conduit");
3267                         return notifier_from_errno(-EINVAL);
3268                 }
3269         }
3270
3271         return NOTIFY_DONE;
3272 }
3273
3274 static void dsa_tree_migrate_ports_from_lag_conduit(struct dsa_switch_tree *dst,
3275                                                     struct net_device *lag_dev)
3276 {
3277         struct net_device *new_conduit = dsa_tree_find_first_conduit(dst);
3278         struct dsa_port *dp;
3279         int err;
3280
3281         dsa_tree_for_each_user_port(dp, dst) {
3282                 if (dsa_port_to_conduit(dp) != lag_dev)
3283                         continue;
3284
3285                 err = dsa_user_change_conduit(dp->user, new_conduit, NULL);
3286                 if (err) {
3287                         netdev_err(dp->user,
3288                                    "failed to restore conduit to %s: %pe\n",
3289                                    new_conduit->name, ERR_PTR(err));
3290                 }
3291         }
3292 }
3293
3294 static int dsa_conduit_lag_join(struct net_device *conduit,
3295                                 struct net_device *lag_dev,
3296                                 struct netdev_lag_upper_info *uinfo,
3297                                 struct netlink_ext_ack *extack)
3298 {
3299         struct dsa_port *cpu_dp = conduit->dsa_ptr;
3300         struct dsa_switch_tree *dst = cpu_dp->dst;
3301         struct dsa_port *dp;
3302         int err;
3303
3304         err = dsa_conduit_lag_setup(lag_dev, cpu_dp, uinfo, extack);
3305         if (err)
3306                 return err;
3307
3308         dsa_tree_for_each_user_port(dp, dst) {
3309                 if (dsa_port_to_conduit(dp) != conduit)
3310                         continue;
3311
3312                 err = dsa_user_change_conduit(dp->user, lag_dev, extack);
3313                 if (err)
3314                         goto restore;
3315         }
3316
3317         return 0;
3318
3319 restore:
3320         dsa_tree_for_each_user_port_continue_reverse(dp, dst) {
3321                 if (dsa_port_to_conduit(dp) != lag_dev)
3322                         continue;
3323
3324                 err = dsa_user_change_conduit(dp->user, conduit, NULL);
3325                 if (err) {
3326                         netdev_err(dp->user,
3327                                    "failed to restore conduit to %s: %pe\n",
3328                                    conduit->name, ERR_PTR(err));
3329                 }
3330         }
3331
3332         dsa_conduit_lag_teardown(lag_dev, conduit->dsa_ptr);
3333
3334         return err;
3335 }
3336
3337 static void dsa_conduit_lag_leave(struct net_device *conduit,
3338                                   struct net_device *lag_dev)
3339 {
3340         struct dsa_port *dp, *cpu_dp = lag_dev->dsa_ptr;
3341         struct dsa_switch_tree *dst = cpu_dp->dst;
3342         struct dsa_port *new_cpu_dp = NULL;
3343         struct net_device *lower;
3344         struct list_head *iter;
3345
3346         netdev_for_each_lower_dev(lag_dev, lower, iter) {
3347                 if (netdev_uses_dsa(lower)) {
3348                         new_cpu_dp = lower->dsa_ptr;
3349                         break;
3350                 }
3351         }
3352
3353         if (new_cpu_dp) {
3354                 /* Update the CPU port of the user ports still under the LAG
3355                  * so that dsa_port_to_conduit() continues to work properly
3356                  */
3357                 dsa_tree_for_each_user_port(dp, dst)
3358                         if (dsa_port_to_conduit(dp) == lag_dev)
3359                                 dp->cpu_dp = new_cpu_dp;
3360
3361                 /* Update the index of the virtual CPU port to match the lowest
3362                  * physical CPU port
3363                  */
3364                 lag_dev->dsa_ptr = new_cpu_dp;
3365                 wmb();
3366         } else {
3367                 /* If the LAG DSA conduit has no ports left, migrate back all
3368                  * user ports to the first physical CPU port
3369                  */
3370                 dsa_tree_migrate_ports_from_lag_conduit(dst, lag_dev);
3371         }
3372
3373         /* This DSA conduit has left its LAG in any case, so let
3374          * the CPU port leave the hardware LAG as well
3375          */
3376         dsa_conduit_lag_teardown(lag_dev, conduit->dsa_ptr);
3377 }
3378
3379 static int dsa_conduit_changeupper(struct net_device *dev,
3380                                    struct netdev_notifier_changeupper_info *info)
3381 {
3382         struct netlink_ext_ack *extack;
3383         int err = NOTIFY_DONE;
3384
3385         if (!netdev_uses_dsa(dev))
3386                 return err;
3387
3388         extack = netdev_notifier_info_to_extack(&info->info);
3389
3390         if (netif_is_lag_master(info->upper_dev)) {
3391                 if (info->linking) {
3392                         err = dsa_conduit_lag_join(dev, info->upper_dev,
3393                                                    info->upper_info, extack);
3394                         err = notifier_from_errno(err);
3395                 } else {
3396                         dsa_conduit_lag_leave(dev, info->upper_dev);
3397                         err = NOTIFY_OK;
3398                 }
3399         }
3400
3401         return err;
3402 }
3403
3404 static int dsa_user_netdevice_event(struct notifier_block *nb,
3405                                     unsigned long event, void *ptr)
3406 {
3407         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3408
3409         switch (event) {
3410         case NETDEV_PRECHANGEUPPER: {
3411                 struct netdev_notifier_changeupper_info *info = ptr;
3412                 int err;
3413
3414                 err = dsa_user_prechangeupper_sanity_check(dev, info);
3415                 if (notifier_to_errno(err))
3416                         return err;
3417
3418                 err = dsa_conduit_prechangeupper_sanity_check(dev, info);
3419                 if (notifier_to_errno(err))
3420                         return err;
3421
3422                 err = dsa_lag_conduit_prechangelower_sanity_check(dev, info);
3423                 if (notifier_to_errno(err))
3424                         return err;
3425
3426                 err = dsa_bridge_prechangelower_sanity_check(dev, info);
3427                 if (notifier_to_errno(err))
3428                         return err;
3429
3430                 err = dsa_user_prechangeupper(dev, ptr);
3431                 if (notifier_to_errno(err))
3432                         return err;
3433
3434                 err = dsa_user_lag_prechangeupper(dev, ptr);
3435                 if (notifier_to_errno(err))
3436                         return err;
3437
3438                 break;
3439         }
3440         case NETDEV_CHANGEUPPER: {
3441                 int err;
3442
3443                 err = dsa_user_changeupper(dev, ptr);
3444                 if (notifier_to_errno(err))
3445                         return err;
3446
3447                 err = dsa_user_lag_changeupper(dev, ptr);
3448                 if (notifier_to_errno(err))
3449                         return err;
3450
3451                 err = dsa_conduit_changeupper(dev, ptr);
3452                 if (notifier_to_errno(err))
3453                         return err;
3454
3455                 break;
3456         }
3457         case NETDEV_CHANGELOWERSTATE: {
3458                 struct netdev_notifier_changelowerstate_info *info = ptr;
3459                 struct dsa_port *dp;
3460                 int err = 0;
3461
3462                 if (dsa_user_dev_check(dev)) {
3463                         dp = dsa_user_to_port(dev);
3464
3465                         err = dsa_port_lag_change(dp, info->lower_state_info);
3466                 }
3467
3468                 /* Mirror LAG port events on DSA conduits that are in
3469                  * a LAG towards their respective switch CPU ports
3470                  */
3471                 if (netdev_uses_dsa(dev)) {
3472                         dp = dev->dsa_ptr;
3473
3474                         err = dsa_port_lag_change(dp, info->lower_state_info);
3475                 }
3476
3477                 return notifier_from_errno(err);
3478         }
3479         case NETDEV_CHANGE:
3480         case NETDEV_UP: {
3481                 /* Track state of conduit port.
3482                  * DSA driver may require the conduit port (and indirectly
3483                  * the tagger) to be available for some special operation.
3484                  */
3485                 if (netdev_uses_dsa(dev)) {
3486                         struct dsa_port *cpu_dp = dev->dsa_ptr;
3487                         struct dsa_switch_tree *dst = cpu_dp->ds->dst;
3488
3489                         /* Track when the conduit port is UP */
3490                         dsa_tree_conduit_oper_state_change(dst, dev,
3491                                                            netif_oper_up(dev));
3492
3493                         /* Track when the conduit port is ready and can accept
3494                          * packet.
3495                          * NETDEV_UP event is not enough to flag a port as ready.
3496                          * We also have to wait for linkwatch_do_dev to dev_activate
3497                          * and emit a NETDEV_CHANGE event.
3498                          * We check if a conduit port is ready by checking if the dev
3499                          * have a qdisc assigned and is not noop.
3500                          */
3501                         dsa_tree_conduit_admin_state_change(dst, dev,
3502                                                             !qdisc_tx_is_noop(dev));
3503
3504                         return NOTIFY_OK;
3505                 }
3506
3507                 return NOTIFY_DONE;
3508         }
3509         case NETDEV_GOING_DOWN: {
3510                 struct dsa_port *dp, *cpu_dp;
3511                 struct dsa_switch_tree *dst;
3512                 LIST_HEAD(close_list);
3513
3514                 if (!netdev_uses_dsa(dev))
3515                         return NOTIFY_DONE;
3516
3517                 cpu_dp = dev->dsa_ptr;
3518                 dst = cpu_dp->ds->dst;
3519
3520                 dsa_tree_conduit_admin_state_change(dst, dev, false);
3521
3522                 list_for_each_entry(dp, &dst->ports, list) {
3523                         if (!dsa_port_is_user(dp))
3524                                 continue;
3525
3526                         if (dp->cpu_dp != cpu_dp)
3527                                 continue;
3528
3529                         list_add(&dp->user->close_list, &close_list);
3530                 }
3531
3532                 dev_close_many(&close_list, true);
3533
3534                 return NOTIFY_OK;
3535         }
3536         default:
3537                 break;
3538         }
3539
3540         return NOTIFY_DONE;
3541 }
3542
3543 static void
3544 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
3545 {
3546         struct switchdev_notifier_fdb_info info = {};
3547
3548         info.addr = switchdev_work->addr;
3549         info.vid = switchdev_work->vid;
3550         info.offloaded = true;
3551         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
3552                                  switchdev_work->orig_dev, &info.info, NULL);
3553 }
3554
3555 static void dsa_user_switchdev_event_work(struct work_struct *work)
3556 {
3557         struct dsa_switchdev_event_work *switchdev_work =
3558                 container_of(work, struct dsa_switchdev_event_work, work);
3559         const unsigned char *addr = switchdev_work->addr;
3560         struct net_device *dev = switchdev_work->dev;
3561         u16 vid = switchdev_work->vid;
3562         struct dsa_switch *ds;
3563         struct dsa_port *dp;
3564         int err;
3565
3566         dp = dsa_user_to_port(dev);
3567         ds = dp->ds;
3568
3569         switch (switchdev_work->event) {
3570         case SWITCHDEV_FDB_ADD_TO_DEVICE:
3571                 if (switchdev_work->host_addr)
3572                         err = dsa_port_bridge_host_fdb_add(dp, addr, vid);
3573                 else if (dp->lag)
3574                         err = dsa_port_lag_fdb_add(dp, addr, vid);
3575                 else
3576                         err = dsa_port_fdb_add(dp, addr, vid);
3577                 if (err) {
3578                         dev_err(ds->dev,
3579                                 "port %d failed to add %pM vid %d to fdb: %d\n",
3580                                 dp->index, addr, vid, err);
3581                         break;
3582                 }
3583                 dsa_fdb_offload_notify(switchdev_work);
3584                 break;
3585
3586         case SWITCHDEV_FDB_DEL_TO_DEVICE:
3587                 if (switchdev_work->host_addr)
3588                         err = dsa_port_bridge_host_fdb_del(dp, addr, vid);
3589                 else if (dp->lag)
3590                         err = dsa_port_lag_fdb_del(dp, addr, vid);
3591                 else
3592                         err = dsa_port_fdb_del(dp, addr, vid);
3593                 if (err) {
3594                         dev_err(ds->dev,
3595                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
3596                                 dp->index, addr, vid, err);
3597                 }
3598
3599                 break;
3600         }
3601
3602         kfree(switchdev_work);
3603 }
3604
3605 static bool dsa_foreign_dev_check(const struct net_device *dev,
3606                                   const struct net_device *foreign_dev)
3607 {
3608         const struct dsa_port *dp = dsa_user_to_port(dev);
3609         struct dsa_switch_tree *dst = dp->ds->dst;
3610
3611         if (netif_is_bridge_master(foreign_dev))
3612                 return !dsa_tree_offloads_bridge_dev(dst, foreign_dev);
3613
3614         if (netif_is_bridge_port(foreign_dev))
3615                 return !dsa_tree_offloads_bridge_port(dst, foreign_dev);
3616
3617         /* Everything else is foreign */
3618         return true;
3619 }
3620
3621 static int dsa_user_fdb_event(struct net_device *dev,
3622                               struct net_device *orig_dev,
3623                               unsigned long event, const void *ctx,
3624                               const struct switchdev_notifier_fdb_info *fdb_info)
3625 {
3626         struct dsa_switchdev_event_work *switchdev_work;
3627         struct dsa_port *dp = dsa_user_to_port(dev);
3628         bool host_addr = fdb_info->is_local;
3629         struct dsa_switch *ds = dp->ds;
3630
3631         if (ctx && ctx != dp)
3632                 return 0;
3633
3634         if (!dp->bridge)
3635                 return 0;
3636
3637         if (switchdev_fdb_is_dynamically_learned(fdb_info)) {
3638                 if (dsa_port_offloads_bridge_port(dp, orig_dev))
3639                         return 0;
3640
3641                 /* FDB entries learned by the software bridge or by foreign
3642                  * bridge ports should be installed as host addresses only if
3643                  * the driver requests assisted learning.
3644                  */
3645                 if (!ds->assisted_learning_on_cpu_port)
3646                         return 0;
3647         }
3648
3649         /* Also treat FDB entries on foreign interfaces bridged with us as host
3650          * addresses.
3651          */
3652         if (dsa_foreign_dev_check(dev, orig_dev))
3653                 host_addr = true;
3654
3655         /* Check early that we're not doing work in vain.
3656          * Host addresses on LAG ports still require regular FDB ops,
3657          * since the CPU port isn't in a LAG.
3658          */
3659         if (dp->lag && !host_addr) {
3660                 if (!ds->ops->lag_fdb_add || !ds->ops->lag_fdb_del)
3661                         return -EOPNOTSUPP;
3662         } else {
3663                 if (!ds->ops->port_fdb_add || !ds->ops->port_fdb_del)
3664                         return -EOPNOTSUPP;
3665         }
3666
3667         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
3668         if (!switchdev_work)
3669                 return -ENOMEM;
3670
3671         netdev_dbg(dev, "%s FDB entry towards %s, addr %pM vid %d%s\n",
3672                    event == SWITCHDEV_FDB_ADD_TO_DEVICE ? "Adding" : "Deleting",
3673                    orig_dev->name, fdb_info->addr, fdb_info->vid,
3674                    host_addr ? " as host address" : "");
3675
3676         INIT_WORK(&switchdev_work->work, dsa_user_switchdev_event_work);
3677         switchdev_work->event = event;
3678         switchdev_work->dev = dev;
3679         switchdev_work->orig_dev = orig_dev;
3680
3681         ether_addr_copy(switchdev_work->addr, fdb_info->addr);
3682         switchdev_work->vid = fdb_info->vid;
3683         switchdev_work->host_addr = host_addr;
3684
3685         dsa_schedule_work(&switchdev_work->work);
3686
3687         return 0;
3688 }
3689
3690 /* Called under rcu_read_lock() */
3691 static int dsa_user_switchdev_event(struct notifier_block *unused,
3692                                     unsigned long event, void *ptr)
3693 {
3694         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3695         int err;
3696
3697         switch (event) {
3698         case SWITCHDEV_PORT_ATTR_SET:
3699                 err = switchdev_handle_port_attr_set(dev, ptr,
3700                                                      dsa_user_dev_check,
3701                                                      dsa_user_port_attr_set);
3702                 return notifier_from_errno(err);
3703         case SWITCHDEV_FDB_ADD_TO_DEVICE:
3704         case SWITCHDEV_FDB_DEL_TO_DEVICE:
3705                 err = switchdev_handle_fdb_event_to_device(dev, event, ptr,
3706                                                            dsa_user_dev_check,
3707                                                            dsa_foreign_dev_check,
3708                                                            dsa_user_fdb_event);
3709                 return notifier_from_errno(err);
3710         default:
3711                 return NOTIFY_DONE;
3712         }
3713
3714         return NOTIFY_OK;
3715 }
3716
3717 static int dsa_user_switchdev_blocking_event(struct notifier_block *unused,
3718                                              unsigned long event, void *ptr)
3719 {
3720         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3721         int err;
3722
3723         switch (event) {
3724         case SWITCHDEV_PORT_OBJ_ADD:
3725                 err = switchdev_handle_port_obj_add_foreign(dev, ptr,
3726                                                             dsa_user_dev_check,
3727                                                             dsa_foreign_dev_check,
3728                                                             dsa_user_port_obj_add);
3729                 return notifier_from_errno(err);
3730         case SWITCHDEV_PORT_OBJ_DEL:
3731                 err = switchdev_handle_port_obj_del_foreign(dev, ptr,
3732                                                             dsa_user_dev_check,
3733                                                             dsa_foreign_dev_check,
3734                                                             dsa_user_port_obj_del);
3735                 return notifier_from_errno(err);
3736         case SWITCHDEV_PORT_ATTR_SET:
3737                 err = switchdev_handle_port_attr_set(dev, ptr,
3738                                                      dsa_user_dev_check,
3739                                                      dsa_user_port_attr_set);
3740                 return notifier_from_errno(err);
3741         }
3742
3743         return NOTIFY_DONE;
3744 }
3745
3746 static struct notifier_block dsa_user_nb __read_mostly = {
3747         .notifier_call  = dsa_user_netdevice_event,
3748 };
3749
3750 struct notifier_block dsa_user_switchdev_notifier = {
3751         .notifier_call = dsa_user_switchdev_event,
3752 };
3753
3754 struct notifier_block dsa_user_switchdev_blocking_notifier = {
3755         .notifier_call = dsa_user_switchdev_blocking_event,
3756 };
3757
3758 int dsa_user_register_notifier(void)
3759 {
3760         struct notifier_block *nb;
3761         int err;
3762
3763         err = register_netdevice_notifier(&dsa_user_nb);
3764         if (err)
3765                 return err;
3766
3767         err = register_switchdev_notifier(&dsa_user_switchdev_notifier);
3768         if (err)
3769                 goto err_switchdev_nb;
3770
3771         nb = &dsa_user_switchdev_blocking_notifier;
3772         err = register_switchdev_blocking_notifier(nb);
3773         if (err)
3774                 goto err_switchdev_blocking_nb;
3775
3776         return 0;
3777
3778 err_switchdev_blocking_nb:
3779         unregister_switchdev_notifier(&dsa_user_switchdev_notifier);
3780 err_switchdev_nb:
3781         unregister_netdevice_notifier(&dsa_user_nb);
3782         return err;
3783 }
3784
3785 void dsa_user_unregister_notifier(void)
3786 {
3787         struct notifier_block *nb;
3788         int err;
3789
3790         nb = &dsa_user_switchdev_blocking_notifier;
3791         err = unregister_switchdev_blocking_notifier(nb);
3792         if (err)
3793                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
3794
3795         err = unregister_switchdev_notifier(&dsa_user_switchdev_notifier);
3796         if (err)
3797                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
3798
3799         err = unregister_netdevice_notifier(&dsa_user_nb);
3800         if (err)
3801                 pr_err("DSA: failed to unregister user notifier (%d)\n", err);
3802 }