net/dsa/slave.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/dsa/slave.c - Slave device handling
   4  * Copyright (c) 2008-2009 Marvell Semiconductor
   5  */
   6
   7 #include <linux/list.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/phy.h>
  11 #include <linux/phy_fixed.h>
  12 #include <linux/phylink.h>
  13 #include <linux/of_net.h>
  14 #include <linux/of_mdio.h>
  15 #include <linux/mdio.h>
  16 #include <net/rtnetlink.h>
  17 #include <net/pkt_cls.h>
  18 #include <net/selftests.h>
  19 #include <net/tc_act/tc_mirred.h>
  20 #include <linux/if_bridge.h>
  21 #include <linux/if_hsr.h>
  22 #include <net/dcbnl.h>
  23 #include <linux/netpoll.h>
  24
  25 #include "dsa.h"
  26 #include "port.h"
  27 #include "master.h"
  28 #include "netlink.h"
  29 #include "slave.h"
  30 #include "tag.h"
  31
  32 struct dsa_switchdev_event_work {
  33         struct net_device *dev;
  34         struct net_device *orig_dev;
  35         struct work_struct work;
  36         unsigned long event;
  37         /* Specific for SWITCHDEV_FDB_ADD_TO_DEVICE and
  38          * SWITCHDEV_FDB_DEL_TO_DEVICE
  39          */
  40         unsigned char addr[ETH_ALEN];
  41         u16 vid;
  42         bool host_addr;
  43 };
  44
  45 enum dsa_standalone_event {
  46         DSA_UC_ADD,
  47         DSA_UC_DEL,
  48         DSA_MC_ADD,
  49         DSA_MC_DEL,
  50 };
  51
  52 struct dsa_standalone_event_work {
  53         struct work_struct work;
  54         struct net_device *dev;
  55         enum dsa_standalone_event event;
  56         unsigned char addr[ETH_ALEN];
  57         u16 vid;
  58 };
  59
  60 struct dsa_host_vlan_rx_filtering_ctx {
  61         struct net_device *dev;
  62         const unsigned char *addr;
  63         enum dsa_standalone_event event;
  64 };
  65
  66 static bool dsa_switch_supports_uc_filtering(struct dsa_switch *ds)
  67 {
  68         return ds->ops->port_fdb_add && ds->ops->port_fdb_del &&
  69                ds->fdb_isolation && !ds->vlan_filtering_is_global &&
  70                !ds->needs_standalone_vlan_filtering;
  71 }
  72
  73 static bool dsa_switch_supports_mc_filtering(struct dsa_switch *ds)
  74 {
  75         return ds->ops->port_mdb_add && ds->ops->port_mdb_del &&
  76                ds->fdb_isolation && !ds->vlan_filtering_is_global &&
  77                !ds->needs_standalone_vlan_filtering;
  78 }
  79
  80 static void dsa_slave_standalone_event_work(struct work_struct *work)
  81 {
  82         struct dsa_standalone_event_work *standalone_work =
  83                 container_of(work, struct dsa_standalone_event_work, work);
  84         const unsigned char *addr = standalone_work->addr;
  85         struct net_device *dev = standalone_work->dev;
  86         struct dsa_port *dp = dsa_slave_to_port(dev);
  87         struct switchdev_obj_port_mdb mdb;
  88         struct dsa_switch *ds = dp->ds;
  89         u16 vid = standalone_work->vid;
  90         int err;
  91
  92         switch (standalone_work->event) {
  93         case DSA_UC_ADD:
  94                 err = dsa_port_standalone_host_fdb_add(dp, addr, vid);
  95                 if (err) {
  96                         dev_err(ds->dev,
  97                                 "port %d failed to add %pM vid %d to fdb: %d\n",
  98                                 dp->index, addr, vid, err);
  99                         break;
 100                 }
 101                 break;
 102
 103         case DSA_UC_DEL:
 104                 err = dsa_port_standalone_host_fdb_del(dp, addr, vid);
 105                 if (err) {
 106                         dev_err(ds->dev,
 107                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
 108                                 dp->index, addr, vid, err);
 109                 }
 110
 111                 break;
 112         case DSA_MC_ADD:
 113                 ether_addr_copy(mdb.addr, addr);
 114                 mdb.vid = vid;
 115
 116                 err = dsa_port_standalone_host_mdb_add(dp, &mdb);
 117                 if (err) {
 118                         dev_err(ds->dev,
 119                                 "port %d failed to add %pM vid %d to mdb: %d\n",
 120                                 dp->index, addr, vid, err);
 121                         break;
 122                 }
 123                 break;
 124         case DSA_MC_DEL:
 125                 ether_addr_copy(mdb.addr, addr);
 126                 mdb.vid = vid;
 127
 128                 err = dsa_port_standalone_host_mdb_del(dp, &mdb);
 129                 if (err) {
 130                         dev_err(ds->dev,
 131                                 "port %d failed to delete %pM vid %d from mdb: %d\n",
 132                                 dp->index, addr, vid, err);
 133                 }
 134
 135                 break;
 136         }
 137
 138         kfree(standalone_work);
 139 }
 140
 141 static int dsa_slave_schedule_standalone_work(struct net_device *dev,
 142                                               enum dsa_standalone_event event,
 143                                               const unsigned char *addr,
 144                                               u16 vid)
 145 {
 146         struct dsa_standalone_event_work *standalone_work;
 147
 148         standalone_work = kzalloc(sizeof(*standalone_work), GFP_ATOMIC);
 149         if (!standalone_work)
 150                 return -ENOMEM;
 151
 152         INIT_WORK(&standalone_work->work, dsa_slave_standalone_event_work);
 153         standalone_work->event = event;
 154         standalone_work->dev = dev;
 155
 156         ether_addr_copy(standalone_work->addr, addr);
 157         standalone_work->vid = vid;
 158
 159         dsa_schedule_work(&standalone_work->work);
 160
 161         return 0;
 162 }
 163
 164 static int dsa_slave_host_vlan_rx_filtering(struct net_device *vdev, int vid,
 165                                             void *arg)
 166 {
 167         struct dsa_host_vlan_rx_filtering_ctx *ctx = arg;
 168
 169         return dsa_slave_schedule_standalone_work(ctx->dev, ctx->event,
 170                                                   ctx->addr, vid);
 171 }
 172
 173 static int dsa_slave_sync_uc(struct net_device *dev,
 174                              const unsigned char *addr)
 175 {
 176         struct net_device *master = dsa_slave_to_master(dev);
 177         struct dsa_port *dp = dsa_slave_to_port(dev);
 178         struct dsa_host_vlan_rx_filtering_ctx ctx = {
 179                 .dev = dev,
 180                 .addr = addr,
 181                 .event = DSA_UC_ADD,
 182         };
 183         int err;
 184
 185         dev_uc_add(master, addr);
 186
 187         if (!dsa_switch_supports_uc_filtering(dp->ds))
 188                 return 0;
 189
 190         err = dsa_slave_schedule_standalone_work(dev, DSA_UC_ADD, addr, 0);
 191         if (err)
 192                 return err;
 193
 194         return vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering, &ctx);
 195 }
 196
 197 static int dsa_slave_unsync_uc(struct net_device *dev,
 198                                const unsigned char *addr)
 199 {
 200         struct net_device *master = dsa_slave_to_master(dev);
 201         struct dsa_port *dp = dsa_slave_to_port(dev);
 202         struct dsa_host_vlan_rx_filtering_ctx ctx = {
 203                 .dev = dev,
 204                 .addr = addr,
 205                 .event = DSA_UC_DEL,
 206         };
 207         int err;
 208
 209         dev_uc_del(master, addr);
 210
 211         if (!dsa_switch_supports_uc_filtering(dp->ds))
 212                 return 0;
 213
 214         err = dsa_slave_schedule_standalone_work(dev, DSA_UC_DEL, addr, 0);
 215         if (err)
 216                 return err;
 217
 218         return vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering, &ctx);
 219 }
 220
 221 static int dsa_slave_sync_mc(struct net_device *dev,
 222                              const unsigned char *addr)
 223 {
 224         struct net_device *master = dsa_slave_to_master(dev);
 225         struct dsa_port *dp = dsa_slave_to_port(dev);
 226         struct dsa_host_vlan_rx_filtering_ctx ctx = {
 227                 .dev = dev,
 228                 .addr = addr,
 229                 .event = DSA_MC_ADD,
 230         };
 231         int err;
 232
 233         dev_mc_add(master, addr);
 234
 235         if (!dsa_switch_supports_mc_filtering(dp->ds))
 236                 return 0;
 237
 238         err = dsa_slave_schedule_standalone_work(dev, DSA_MC_ADD, addr, 0);
 239         if (err)
 240                 return err;
 241
 242         return vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering, &ctx);
 243 }
 244
 245 static int dsa_slave_unsync_mc(struct net_device *dev,
 246                                const unsigned char *addr)
 247 {
 248         struct net_device *master = dsa_slave_to_master(dev);
 249         struct dsa_port *dp = dsa_slave_to_port(dev);
 250         struct dsa_host_vlan_rx_filtering_ctx ctx = {
 251                 .dev = dev,
 252                 .addr = addr,
 253                 .event = DSA_MC_DEL,
 254         };
 255         int err;
 256
 257         dev_mc_del(master, addr);
 258
 259         if (!dsa_switch_supports_mc_filtering(dp->ds))
 260                 return 0;
 261
 262         err = dsa_slave_schedule_standalone_work(dev, DSA_MC_DEL, addr, 0);
 263         if (err)
 264                 return err;
 265
 266         return vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering, &ctx);
 267 }
 268
 269 void dsa_slave_sync_ha(struct net_device *dev)
 270 {
 271         struct dsa_port *dp = dsa_slave_to_port(dev);
 272         struct dsa_switch *ds = dp->ds;
 273         struct netdev_hw_addr *ha;
 274
 275         netif_addr_lock_bh(dev);
 276
 277         netdev_for_each_synced_mc_addr(ha, dev)
 278                 dsa_slave_sync_mc(dev, ha->addr);
 279
 280         netdev_for_each_synced_uc_addr(ha, dev)
 281                 dsa_slave_sync_uc(dev, ha->addr);
 282
 283         netif_addr_unlock_bh(dev);
 284
 285         if (dsa_switch_supports_uc_filtering(ds) ||
 286             dsa_switch_supports_mc_filtering(ds))
 287                 dsa_flush_workqueue();
 288 }
 289
 290 void dsa_slave_unsync_ha(struct net_device *dev)
 291 {
 292         struct dsa_port *dp = dsa_slave_to_port(dev);
 293         struct dsa_switch *ds = dp->ds;
 294         struct netdev_hw_addr *ha;
 295
 296         netif_addr_lock_bh(dev);
 297
 298         netdev_for_each_synced_uc_addr(ha, dev)
 299                 dsa_slave_unsync_uc(dev, ha->addr);
 300
 301         netdev_for_each_synced_mc_addr(ha, dev)
 302                 dsa_slave_unsync_mc(dev, ha->addr);
 303
 304         netif_addr_unlock_bh(dev);
 305
 306         if (dsa_switch_supports_uc_filtering(ds) ||
 307             dsa_switch_supports_mc_filtering(ds))
 308                 dsa_flush_workqueue();
 309 }
 310
 311 /* slave mii_bus handling ***************************************************/
 312 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
 313 {
 314         struct dsa_switch *ds = bus->priv;
 315
 316         if (ds->phys_mii_mask & (1 << addr))
 317                 return ds->ops->phy_read(ds, addr, reg);
 318
 319         return 0xffff;
 320 }
 321
 322 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
 323 {
 324         struct dsa_switch *ds = bus->priv;
 325
 326         if (ds->phys_mii_mask & (1 << addr))
 327                 return ds->ops->phy_write(ds, addr, reg, val);
 328
 329         return 0;
 330 }
 331
 332 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
 333 {
 334         ds->slave_mii_bus->priv = (void *)ds;
 335         ds->slave_mii_bus->name = "dsa slave smi";
 336         ds->slave_mii_bus->read = dsa_slave_phy_read;
 337         ds->slave_mii_bus->write = dsa_slave_phy_write;
 338         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
 339                  ds->dst->index, ds->index);
 340         ds->slave_mii_bus->parent = ds->dev;
 341         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
 342 }
 343
 344
 345 /* slave device handling ****************************************************/
 346 static int dsa_slave_get_iflink(const struct net_device *dev)
 347 {
 348         return dsa_slave_to_master(dev)->ifindex;
 349 }
 350
 351 static int dsa_slave_open(struct net_device *dev)
 352 {
 353         struct net_device *master = dsa_slave_to_master(dev);
 354         struct dsa_port *dp = dsa_slave_to_port(dev);
 355         struct dsa_switch *ds = dp->ds;
 356         int err;
 357
 358         err = dev_open(master, NULL);
 359         if (err < 0) {
 360                 netdev_err(dev, "failed to open master %s\n", master->name);
 361                 goto out;
 362         }
 363
 364         if (dsa_switch_supports_uc_filtering(ds)) {
 365                 err = dsa_port_standalone_host_fdb_add(dp, dev->dev_addr, 0);
 366                 if (err)
 367                         goto out;
 368         }
 369
 370         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
 371                 err = dev_uc_add(master, dev->dev_addr);
 372                 if (err < 0)
 373                         goto del_host_addr;
 374         }
 375
 376         err = dsa_port_enable_rt(dp, dev->phydev);
 377         if (err)
 378                 goto del_unicast;
 379
 380         return 0;
 381
 382 del_unicast:
 383         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 384                 dev_uc_del(master, dev->dev_addr);
 385 del_host_addr:
 386         if (dsa_switch_supports_uc_filtering(ds))
 387                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 388 out:
 389         return err;
 390 }
 391
 392 static int dsa_slave_close(struct net_device *dev)
 393 {
 394         struct net_device *master = dsa_slave_to_master(dev);
 395         struct dsa_port *dp = dsa_slave_to_port(dev);
 396         struct dsa_switch *ds = dp->ds;
 397
 398         dsa_port_disable_rt(dp);
 399
 400         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 401                 dev_uc_del(master, dev->dev_addr);
 402
 403         if (dsa_switch_supports_uc_filtering(ds))
 404                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 405
 406         return 0;
 407 }
 408
 409 static void dsa_slave_manage_host_flood(struct net_device *dev)
 410 {
 411         bool mc = dev->flags & (IFF_PROMISC | IFF_ALLMULTI);
 412         struct dsa_port *dp = dsa_slave_to_port(dev);
 413         bool uc = dev->flags & IFF_PROMISC;
 414
 415         dsa_port_set_host_flood(dp, uc, mc);
 416 }
 417
 418 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 419 {
 420         struct net_device *master = dsa_slave_to_master(dev);
 421         struct dsa_port *dp = dsa_slave_to_port(dev);
 422         struct dsa_switch *ds = dp->ds;
 423
 424         if (change & IFF_ALLMULTI)
 425                 dev_set_allmulti(master,
 426                                  dev->flags & IFF_ALLMULTI ? 1 : -1);
 427         if (change & IFF_PROMISC)
 428                 dev_set_promiscuity(master,
 429                                     dev->flags & IFF_PROMISC ? 1 : -1);
 430
 431         if (dsa_switch_supports_uc_filtering(ds) &&
 432             dsa_switch_supports_mc_filtering(ds))
 433                 dsa_slave_manage_host_flood(dev);
 434 }
 435
 436 static void dsa_slave_set_rx_mode(struct net_device *dev)
 437 {
 438         __dev_mc_sync(dev, dsa_slave_sync_mc, dsa_slave_unsync_mc);
 439         __dev_uc_sync(dev, dsa_slave_sync_uc, dsa_slave_unsync_uc);
 440 }
 441
 442 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 443 {
 444         struct net_device *master = dsa_slave_to_master(dev);
 445         struct dsa_port *dp = dsa_slave_to_port(dev);
 446         struct dsa_switch *ds = dp->ds;
 447         struct sockaddr *addr = a;
 448         int err;
 449
 450         if (!is_valid_ether_addr(addr->sa_data))
 451                 return -EADDRNOTAVAIL;
 452
 453         /* If the port is down, the address isn't synced yet to hardware or
 454          * to the DSA master, so there is nothing to change.
 455          */
 456         if (!(dev->flags & IFF_UP))
 457                 goto out_change_dev_addr;
 458
 459         if (dsa_switch_supports_uc_filtering(ds)) {
 460                 err = dsa_port_standalone_host_fdb_add(dp, addr->sa_data, 0);
 461                 if (err)
 462                         return err;
 463         }
 464
 465         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 466                 err = dev_uc_add(master, addr->sa_data);
 467                 if (err < 0)
 468                         goto del_unicast;
 469         }
 470
 471         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 472                 dev_uc_del(master, dev->dev_addr);
 473
 474         if (dsa_switch_supports_uc_filtering(ds))
 475                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 476
 477 out_change_dev_addr:
 478         eth_hw_addr_set(dev, addr->sa_data);
 479
 480         return 0;
 481
 482 del_unicast:
 483         if (dsa_switch_supports_uc_filtering(ds))
 484                 dsa_port_standalone_host_fdb_del(dp, addr->sa_data, 0);
 485
 486         return err;
 487 }
 488
 489 struct dsa_slave_dump_ctx {
 490         struct net_device *dev;
 491         struct sk_buff *skb;
 492         struct netlink_callback *cb;
 493         int idx;
 494 };
 495
 496 static int
 497 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 498                            bool is_static, void *data)
 499 {
 500         struct dsa_slave_dump_ctx *dump = data;
 501         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 502         u32 seq = dump->cb->nlh->nlmsg_seq;
 503         struct nlmsghdr *nlh;
 504         struct ndmsg *ndm;
 505
 506         if (dump->idx < dump->cb->args[2])
 507                 goto skip;
 508
 509         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 510                         sizeof(*ndm), NLM_F_MULTI);
 511         if (!nlh)
 512                 return -EMSGSIZE;
 513
 514         ndm = nlmsg_data(nlh);
 515         ndm->ndm_family  = AF_BRIDGE;
 516         ndm->ndm_pad1    = 0;
 517         ndm->ndm_pad2    = 0;
 518         ndm->ndm_flags   = NTF_SELF;
 519         ndm->ndm_type    = 0;
 520         ndm->ndm_ifindex = dump->dev->ifindex;
 521         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 522
 523         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 524                 goto nla_put_failure;
 525
 526         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 527                 goto nla_put_failure;
 528
 529         nlmsg_end(dump->skb, nlh);
 530
 531 skip:
 532         dump->idx++;
 533         return 0;
 534
 535 nla_put_failure:
 536         nlmsg_cancel(dump->skb, nlh);
 537         return -EMSGSIZE;
 538 }
 539
 540 static int
 541 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 542                    struct net_device *dev, struct net_device *filter_dev,
 543                    int *idx)
 544 {
 545         struct dsa_port *dp = dsa_slave_to_port(dev);
 546         struct dsa_slave_dump_ctx dump = {
 547                 .dev = dev,
 548                 .skb = skb,
 549                 .cb = cb,
 550                 .idx = *idx,
 551         };
 552         int err;
 553
 554         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 555         *idx = dump.idx;
 556
 557         return err;
 558 }
 559
 560 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 561 {
 562         struct dsa_slave_priv *p = netdev_priv(dev);
 563         struct dsa_switch *ds = p->dp->ds;
 564         int port = p->dp->index;
 565
 566         /* Pass through to switch driver if it supports timestamping */
 567         switch (cmd) {
 568         case SIOCGHWTSTAMP:
 569                 if (ds->ops->port_hwtstamp_get)
 570                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 571                 break;
 572         case SIOCSHWTSTAMP:
 573                 if (ds->ops->port_hwtstamp_set)
 574                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 575                 break;
 576         }
 577
 578         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 579 }
 580
 581 static int dsa_slave_port_attr_set(struct net_device *dev, const void *ctx,
 582                                    const struct switchdev_attr *attr,
 583                                    struct netlink_ext_ack *extack)
 584 {
 585         struct dsa_port *dp = dsa_slave_to_port(dev);
 586         int ret;
 587
 588         if (ctx && ctx != dp)
 589                 return 0;
 590
 591         switch (attr->id) {
 592         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 593                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 594                         return -EOPNOTSUPP;
 595
 596                 ret = dsa_port_set_state(dp, attr->u.stp_state, true);
 597                 break;
 598         case SWITCHDEV_ATTR_ID_PORT_MST_STATE:
 599                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 600                         return -EOPNOTSUPP;
 601
 602                 ret = dsa_port_set_mst_state(dp, &attr->u.mst_state, extack);
 603                 break;
 604         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 605                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 606                         return -EOPNOTSUPP;
 607
 608                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 609                                               extack);
 610                 break;
 611         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 612                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 613                         return -EOPNOTSUPP;
 614
 615                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 616                 break;
 617         case SWITCHDEV_ATTR_ID_BRIDGE_MST:
 618                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 619                         return -EOPNOTSUPP;
 620
 621                 ret = dsa_port_mst_enable(dp, attr->u.mst, extack);
 622                 break;
 623         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 624                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 625                         return -EOPNOTSUPP;
 626
 627                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 628                                                 extack);
 629                 break;
 630         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 631                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 632                         return -EOPNOTSUPP;
 633
 634                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 635                 break;
 636         case SWITCHDEV_ATTR_ID_VLAN_MSTI:
 637                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 638                         return -EOPNOTSUPP;
 639
 640                 ret = dsa_port_vlan_msti(dp, &attr->u.vlan_msti);
 641                 break;
 642         default:
 643                 ret = -EOPNOTSUPP;
 644                 break;
 645         }
 646
 647         return ret;
 648 }
 649
 650 /* Must be called under rcu_read_lock() */
 651 static int
 652 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 653                                       const struct switchdev_obj_port_vlan *vlan)
 654 {
 655         struct net_device *upper_dev;
 656         struct list_head *iter;
 657
 658         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 659                 u16 vid;
 660
 661                 if (!is_vlan_dev(upper_dev))
 662                         continue;
 663
 664                 vid = vlan_dev_vlan_id(upper_dev);
 665                 if (vid == vlan->vid)
 666                         return -EBUSY;
 667         }
 668
 669         return 0;
 670 }
 671
 672 static int dsa_slave_vlan_add(struct net_device *dev,
 673                               const struct switchdev_obj *obj,
 674                               struct netlink_ext_ack *extack)
 675 {
 676         struct dsa_port *dp = dsa_slave_to_port(dev);
 677         struct switchdev_obj_port_vlan *vlan;
 678         int err;
 679
 680         if (dsa_port_skip_vlan_configuration(dp)) {
 681                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 682                 return 0;
 683         }
 684
 685         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 686
 687         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 688          * the same VID.
 689          */
 690         if (br_vlan_enabled(dsa_port_bridge_dev_get(dp))) {
 691                 rcu_read_lock();
 692                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, vlan);
 693                 rcu_read_unlock();
 694                 if (err) {
 695                         NL_SET_ERR_MSG_MOD(extack,
 696                                            "Port already has a VLAN upper with this VID");
 697                         return err;
 698                 }
 699         }
 700
 701         return dsa_port_vlan_add(dp, vlan, extack);
 702 }
 703
 704 /* Offload a VLAN installed on the bridge or on a foreign interface by
 705  * installing it as a VLAN towards the CPU port.
 706  */
 707 static int dsa_slave_host_vlan_add(struct net_device *dev,
 708                                    const struct switchdev_obj *obj,
 709                                    struct netlink_ext_ack *extack)
 710 {
 711         struct dsa_port *dp = dsa_slave_to_port(dev);
 712         struct switchdev_obj_port_vlan vlan;
 713
 714         /* Do nothing if this is a software bridge */
 715         if (!dp->bridge)
 716                 return -EOPNOTSUPP;
 717
 718         if (dsa_port_skip_vlan_configuration(dp)) {
 719                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 720                 return 0;
 721         }
 722
 723         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 724
 725         /* Even though drivers often handle CPU membership in special ways,
 726          * it doesn't make sense to program a PVID, so clear this flag.
 727          */
 728         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 729
 730         return dsa_port_host_vlan_add(dp, &vlan, extack);
 731 }
 732
 733 static int dsa_slave_port_obj_add(struct net_device *dev, const void *ctx,
 734                                   const struct switchdev_obj *obj,
 735                                   struct netlink_ext_ack *extack)
 736 {
 737         struct dsa_port *dp = dsa_slave_to_port(dev);
 738         int err;
 739
 740         if (ctx && ctx != dp)
 741                 return 0;
 742
 743         switch (obj->id) {
 744         case SWITCHDEV_OBJ_ID_PORT_MDB:
 745                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 746                         return -EOPNOTSUPP;
 747
 748                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 749                 break;
 750         case SWITCHDEV_OBJ_ID_HOST_MDB:
 751                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 752                         return -EOPNOTSUPP;
 753
 754                 err = dsa_port_bridge_host_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 755                 break;
 756         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 757                 if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 758                         err = dsa_slave_vlan_add(dev, obj, extack);
 759                 else
 760                         err = dsa_slave_host_vlan_add(dev, obj, extack);
 761                 break;
 762         case SWITCHDEV_OBJ_ID_MRP:
 763                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 764                         return -EOPNOTSUPP;
 765
 766                 err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 767                 break;
 768         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 769                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 770                         return -EOPNOTSUPP;
 771
 772                 err = dsa_port_mrp_add_ring_role(dp,
 773                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 774                 break;
 775         default:
 776                 err = -EOPNOTSUPP;
 777                 break;
 778         }
 779
 780         return err;
 781 }
 782
 783 static int dsa_slave_vlan_del(struct net_device *dev,
 784                               const struct switchdev_obj *obj)
 785 {
 786         struct dsa_port *dp = dsa_slave_to_port(dev);
 787         struct switchdev_obj_port_vlan *vlan;
 788
 789         if (dsa_port_skip_vlan_configuration(dp))
 790                 return 0;
 791
 792         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 793
 794         return dsa_port_vlan_del(dp, vlan);
 795 }
 796
 797 static int dsa_slave_host_vlan_del(struct net_device *dev,
 798                                    const struct switchdev_obj *obj)
 799 {
 800         struct dsa_port *dp = dsa_slave_to_port(dev);
 801         struct switchdev_obj_port_vlan *vlan;
 802
 803         /* Do nothing if this is a software bridge */
 804         if (!dp->bridge)
 805                 return -EOPNOTSUPP;
 806
 807         if (dsa_port_skip_vlan_configuration(dp))
 808                 return 0;
 809
 810         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 811
 812         return dsa_port_host_vlan_del(dp, vlan);
 813 }
 814
 815 static int dsa_slave_port_obj_del(struct net_device *dev, const void *ctx,
 816                                   const struct switchdev_obj *obj)
 817 {
 818         struct dsa_port *dp = dsa_slave_to_port(dev);
 819         int err;
 820
 821         if (ctx && ctx != dp)
 822                 return 0;
 823
 824         switch (obj->id) {
 825         case SWITCHDEV_OBJ_ID_PORT_MDB:
 826                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 827                         return -EOPNOTSUPP;
 828
 829                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 830                 break;
 831         case SWITCHDEV_OBJ_ID_HOST_MDB:
 832                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 833                         return -EOPNOTSUPP;
 834
 835                 err = dsa_port_bridge_host_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 836                 break;
 837         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 838                 if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 839                         err = dsa_slave_vlan_del(dev, obj);
 840                 else
 841                         err = dsa_slave_host_vlan_del(dev, obj);
 842                 break;
 843         case SWITCHDEV_OBJ_ID_MRP:
 844                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 845                         return -EOPNOTSUPP;
 846
 847                 err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 848                 break;
 849         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 850                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 851                         return -EOPNOTSUPP;
 852
 853                 err = dsa_port_mrp_del_ring_role(dp,
 854                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 855                 break;
 856         default:
 857                 err = -EOPNOTSUPP;
 858                 break;
 859         }
 860
 861         return err;
 862 }
 863
 864 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 865                                                      struct sk_buff *skb)
 866 {
 867 #ifdef CONFIG_NET_POLL_CONTROLLER
 868         struct dsa_slave_priv *p = netdev_priv(dev);
 869
 870         return netpoll_send_skb(p->netpoll, skb);
 871 #else
 872         BUG();
 873         return NETDEV_TX_OK;
 874 #endif
 875 }
 876
 877 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 878                                  struct sk_buff *skb)
 879 {
 880         struct dsa_switch *ds = p->dp->ds;
 881
 882         if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 883                 return;
 884
 885         if (!ds->ops->port_txtstamp)
 886                 return;
 887
 888         ds->ops->port_txtstamp(ds, p->dp->index, skb);
 889 }
 890
 891 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 892 {
 893         /* SKB for netpoll still need to be mangled with the protocol-specific
 894          * tag to be successfully transmitted
 895          */
 896         if (unlikely(netpoll_tx_running(dev)))
 897                 return dsa_slave_netpoll_send_skb(dev, skb);
 898
 899         /* Queue the SKB for transmission on the parent interface, but
 900          * do not modify its EtherType
 901          */
 902         skb->dev = dsa_slave_to_master(dev);
 903         dev_queue_xmit(skb);
 904
 905         return NETDEV_TX_OK;
 906 }
 907 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 908
 909 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 910 {
 911         int needed_headroom = dev->needed_headroom;
 912         int needed_tailroom = dev->needed_tailroom;
 913
 914         /* For tail taggers, we need to pad short frames ourselves, to ensure
 915          * that the tail tag does not fail at its role of being at the end of
 916          * the packet, once the master interface pads the frame. Account for
 917          * that pad length here, and pad later.
 918          */
 919         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 920                 needed_tailroom += ETH_ZLEN - skb->len;
 921         /* skb_headroom() returns unsigned int... */
 922         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 923         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 924
 925         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 926                 /* No reallocation needed, yay! */
 927                 return 0;
 928
 929         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 930                                 GFP_ATOMIC);
 931 }
 932
 933 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 934 {
 935         struct dsa_slave_priv *p = netdev_priv(dev);
 936         struct sk_buff *nskb;
 937
 938         dev_sw_netstats_tx_add(dev, 1, skb->len);
 939
 940         memset(skb->cb, 0, sizeof(skb->cb));
 941
 942         /* Handle tx timestamp if any */
 943         dsa_skb_tx_timestamp(p, skb);
 944
 945         if (dsa_realloc_skb(skb, dev)) {
 946                 dev_kfree_skb_any(skb);
 947                 return NETDEV_TX_OK;
 948         }
 949
 950         /* needed_tailroom should still be 'warm' in the cache line from
 951          * dsa_realloc_skb(), which has also ensured that padding is safe.
 952          */
 953         if (dev->needed_tailroom)
 954                 eth_skb_pad(skb);
 955
 956         /* Transmit function may have to reallocate the original SKB,
 957          * in which case it must have freed it. Only free it here on error.
 958          */
 959         nskb = p->xmit(skb, dev);
 960         if (!nskb) {
 961                 kfree_skb(skb);
 962                 return NETDEV_TX_OK;
 963         }
 964
 965         return dsa_enqueue_skb(nskb, dev);
 966 }
 967
 968 /* ethtool operations *******************************************************/
 969
 970 static void dsa_slave_get_drvinfo(struct net_device *dev,
 971                                   struct ethtool_drvinfo *drvinfo)
 972 {
 973         strscpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 974         strscpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 975         strscpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 976 }
 977
 978 static int dsa_slave_get_regs_len(struct net_device *dev)
 979 {
 980         struct dsa_port *dp = dsa_slave_to_port(dev);
 981         struct dsa_switch *ds = dp->ds;
 982
 983         if (ds->ops->get_regs_len)
 984                 return ds->ops->get_regs_len(ds, dp->index);
 985
 986         return -EOPNOTSUPP;
 987 }
 988
 989 static void
 990 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 991 {
 992         struct dsa_port *dp = dsa_slave_to_port(dev);
 993         struct dsa_switch *ds = dp->ds;
 994
 995         if (ds->ops->get_regs)
 996                 ds->ops->get_regs(ds, dp->index, regs, _p);
 997 }
 998
 999 static int dsa_slave_nway_reset(struct net_device *dev)
1000 {
1001         struct dsa_port *dp = dsa_slave_to_port(dev);
1002
1003         return phylink_ethtool_nway_reset(dp->pl);
1004 }
1005
1006 static int dsa_slave_get_eeprom_len(struct net_device *dev)
1007 {
1008         struct dsa_port *dp = dsa_slave_to_port(dev);
1009         struct dsa_switch *ds = dp->ds;
1010
1011         if (ds->cd && ds->cd->eeprom_len)
1012                 return ds->cd->eeprom_len;
1013
1014         if (ds->ops->get_eeprom_len)
1015                 return ds->ops->get_eeprom_len(ds);
1016
1017         return 0;
1018 }
1019
1020 static int dsa_slave_get_eeprom(struct net_device *dev,
1021                                 struct ethtool_eeprom *eeprom, u8 *data)
1022 {
1023         struct dsa_port *dp = dsa_slave_to_port(dev);
1024         struct dsa_switch *ds = dp->ds;
1025
1026         if (ds->ops->get_eeprom)
1027                 return ds->ops->get_eeprom(ds, eeprom, data);
1028
1029         return -EOPNOTSUPP;
1030 }
1031
1032 static int dsa_slave_set_eeprom(struct net_device *dev,
1033                                 struct ethtool_eeprom *eeprom, u8 *data)
1034 {
1035         struct dsa_port *dp = dsa_slave_to_port(dev);
1036         struct dsa_switch *ds = dp->ds;
1037
1038         if (ds->ops->set_eeprom)
1039                 return ds->ops->set_eeprom(ds, eeprom, data);
1040
1041         return -EOPNOTSUPP;
1042 }
1043
1044 static void dsa_slave_get_strings(struct net_device *dev,
1045                                   uint32_t stringset, uint8_t *data)
1046 {
1047         struct dsa_port *dp = dsa_slave_to_port(dev);
1048         struct dsa_switch *ds = dp->ds;
1049
1050         if (stringset == ETH_SS_STATS) {
1051                 int len = ETH_GSTRING_LEN;
1052
1053                 strncpy(data, "tx_packets", len);
1054                 strncpy(data + len, "tx_bytes", len);
1055                 strncpy(data + 2 * len, "rx_packets", len);
1056                 strncpy(data + 3 * len, "rx_bytes", len);
1057                 if (ds->ops->get_strings)
1058                         ds->ops->get_strings(ds, dp->index, stringset,
1059                                              data + 4 * len);
1060         } else if (stringset ==  ETH_SS_TEST) {
1061                 net_selftest_get_strings(data);
1062         }
1063
1064 }
1065
1066 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
1067                                         struct ethtool_stats *stats,
1068                                         uint64_t *data)
1069 {
1070         struct dsa_port *dp = dsa_slave_to_port(dev);
1071         struct dsa_switch *ds = dp->ds;
1072         struct pcpu_sw_netstats *s;
1073         unsigned int start;
1074         int i;
1075
1076         for_each_possible_cpu(i) {
1077                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
1078
1079                 s = per_cpu_ptr(dev->tstats, i);
1080                 do {
1081                         start = u64_stats_fetch_begin(&s->syncp);
1082                         tx_packets = u64_stats_read(&s->tx_packets);
1083                         tx_bytes = u64_stats_read(&s->tx_bytes);
1084                         rx_packets = u64_stats_read(&s->rx_packets);
1085                         rx_bytes = u64_stats_read(&s->rx_bytes);
1086                 } while (u64_stats_fetch_retry(&s->syncp, start));
1087                 data[0] += tx_packets;
1088                 data[1] += tx_bytes;
1089                 data[2] += rx_packets;
1090                 data[3] += rx_bytes;
1091         }
1092         if (ds->ops->get_ethtool_stats)
1093                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
1094 }
1095
1096 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
1097 {
1098         struct dsa_port *dp = dsa_slave_to_port(dev);
1099         struct dsa_switch *ds = dp->ds;
1100
1101         if (sset == ETH_SS_STATS) {
1102                 int count = 0;
1103
1104                 if (ds->ops->get_sset_count) {
1105                         count = ds->ops->get_sset_count(ds, dp->index, sset);
1106                         if (count < 0)
1107                                 return count;
1108                 }
1109
1110                 return count + 4;
1111         } else if (sset ==  ETH_SS_TEST) {
1112                 return net_selftest_get_count();
1113         }
1114
1115         return -EOPNOTSUPP;
1116 }
1117
1118 static void dsa_slave_get_eth_phy_stats(struct net_device *dev,
1119                                         struct ethtool_eth_phy_stats *phy_stats)
1120 {
1121         struct dsa_port *dp = dsa_slave_to_port(dev);
1122         struct dsa_switch *ds = dp->ds;
1123
1124         if (ds->ops->get_eth_phy_stats)
1125                 ds->ops->get_eth_phy_stats(ds, dp->index, phy_stats);
1126 }
1127
1128 static void dsa_slave_get_eth_mac_stats(struct net_device *dev,
1129                                         struct ethtool_eth_mac_stats *mac_stats)
1130 {
1131         struct dsa_port *dp = dsa_slave_to_port(dev);
1132         struct dsa_switch *ds = dp->ds;
1133
1134         if (ds->ops->get_eth_mac_stats)
1135                 ds->ops->get_eth_mac_stats(ds, dp->index, mac_stats);
1136 }
1137
1138 static void
1139 dsa_slave_get_eth_ctrl_stats(struct net_device *dev,
1140                              struct ethtool_eth_ctrl_stats *ctrl_stats)
1141 {
1142         struct dsa_port *dp = dsa_slave_to_port(dev);
1143         struct dsa_switch *ds = dp->ds;
1144
1145         if (ds->ops->get_eth_ctrl_stats)
1146                 ds->ops->get_eth_ctrl_stats(ds, dp->index, ctrl_stats);
1147 }
1148
1149 static void
1150 dsa_slave_get_rmon_stats(struct net_device *dev,
1151                          struct ethtool_rmon_stats *rmon_stats,
1152                          const struct ethtool_rmon_hist_range **ranges)
1153 {
1154         struct dsa_port *dp = dsa_slave_to_port(dev);
1155         struct dsa_switch *ds = dp->ds;
1156
1157         if (ds->ops->get_rmon_stats)
1158                 ds->ops->get_rmon_stats(ds, dp->index, rmon_stats, ranges);
1159 }
1160
1161 static void dsa_slave_net_selftest(struct net_device *ndev,
1162                                    struct ethtool_test *etest, u64 *buf)
1163 {
1164         struct dsa_port *dp = dsa_slave_to_port(ndev);
1165         struct dsa_switch *ds = dp->ds;
1166
1167         if (ds->ops->self_test) {
1168                 ds->ops->self_test(ds, dp->index, etest, buf);
1169                 return;
1170         }
1171
1172         net_selftest(ndev, etest, buf);
1173 }
1174
1175 static int dsa_slave_get_mm(struct net_device *dev,
1176                             struct ethtool_mm_state *state)
1177 {
1178         struct dsa_port *dp = dsa_slave_to_port(dev);
1179         struct dsa_switch *ds = dp->ds;
1180
1181         if (!ds->ops->get_mm)
1182                 return -EOPNOTSUPP;
1183
1184         return ds->ops->get_mm(ds, dp->index, state);
1185 }
1186
1187 static int dsa_slave_set_mm(struct net_device *dev, struct ethtool_mm_cfg *cfg,
1188                             struct netlink_ext_ack *extack)
1189 {
1190         struct dsa_port *dp = dsa_slave_to_port(dev);
1191         struct dsa_switch *ds = dp->ds;
1192
1193         if (!ds->ops->set_mm)
1194                 return -EOPNOTSUPP;
1195
1196         return ds->ops->set_mm(ds, dp->index, cfg, extack);
1197 }
1198
1199 static void dsa_slave_get_mm_stats(struct net_device *dev,
1200                                    struct ethtool_mm_stats *stats)
1201 {
1202         struct dsa_port *dp = dsa_slave_to_port(dev);
1203         struct dsa_switch *ds = dp->ds;
1204
1205         if (ds->ops->get_mm_stats)
1206                 ds->ops->get_mm_stats(ds, dp->index, stats);
1207 }
1208
1209 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1210 {
1211         struct dsa_port *dp = dsa_slave_to_port(dev);
1212         struct dsa_switch *ds = dp->ds;
1213
1214         phylink_ethtool_get_wol(dp->pl, w);
1215
1216         if (ds->ops->get_wol)
1217                 ds->ops->get_wol(ds, dp->index, w);
1218 }
1219
1220 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1221 {
1222         struct dsa_port *dp = dsa_slave_to_port(dev);
1223         struct dsa_switch *ds = dp->ds;
1224         int ret = -EOPNOTSUPP;
1225
1226         phylink_ethtool_set_wol(dp->pl, w);
1227
1228         if (ds->ops->set_wol)
1229                 ret = ds->ops->set_wol(ds, dp->index, w);
1230
1231         return ret;
1232 }
1233
1234 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
1235 {
1236         struct dsa_port *dp = dsa_slave_to_port(dev);
1237         struct dsa_switch *ds = dp->ds;
1238         int ret;
1239
1240         /* Port's PHY and MAC both need to be EEE capable */
1241         if (!dev->phydev || !dp->pl)
1242                 return -ENODEV;
1243
1244         if (!ds->ops->set_mac_eee)
1245                 return -EOPNOTSUPP;
1246
1247         ret = ds->ops->set_mac_eee(ds, dp->index, e);
1248         if (ret)
1249                 return ret;
1250
1251         return phylink_ethtool_set_eee(dp->pl, e);
1252 }
1253
1254 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
1255 {
1256         struct dsa_port *dp = dsa_slave_to_port(dev);
1257         struct dsa_switch *ds = dp->ds;
1258         int ret;
1259
1260         /* Port's PHY and MAC both need to be EEE capable */
1261         if (!dev->phydev || !dp->pl)
1262                 return -ENODEV;
1263
1264         if (!ds->ops->get_mac_eee)
1265                 return -EOPNOTSUPP;
1266
1267         ret = ds->ops->get_mac_eee(ds, dp->index, e);
1268         if (ret)
1269                 return ret;
1270
1271         return phylink_ethtool_get_eee(dp->pl, e);
1272 }
1273
1274 static int dsa_slave_get_link_ksettings(struct net_device *dev,
1275                                         struct ethtool_link_ksettings *cmd)
1276 {
1277         struct dsa_port *dp = dsa_slave_to_port(dev);
1278
1279         return phylink_ethtool_ksettings_get(dp->pl, cmd);
1280 }
1281
1282 static int dsa_slave_set_link_ksettings(struct net_device *dev,
1283                                         const struct ethtool_link_ksettings *cmd)
1284 {
1285         struct dsa_port *dp = dsa_slave_to_port(dev);
1286
1287         return phylink_ethtool_ksettings_set(dp->pl, cmd);
1288 }
1289
1290 static void dsa_slave_get_pause_stats(struct net_device *dev,
1291                                   struct ethtool_pause_stats *pause_stats)
1292 {
1293         struct dsa_port *dp = dsa_slave_to_port(dev);
1294         struct dsa_switch *ds = dp->ds;
1295
1296         if (ds->ops->get_pause_stats)
1297                 ds->ops->get_pause_stats(ds, dp->index, pause_stats);
1298 }
1299
1300 static void dsa_slave_get_pauseparam(struct net_device *dev,
1301                                      struct ethtool_pauseparam *pause)
1302 {
1303         struct dsa_port *dp = dsa_slave_to_port(dev);
1304
1305         phylink_ethtool_get_pauseparam(dp->pl, pause);
1306 }
1307
1308 static int dsa_slave_set_pauseparam(struct net_device *dev,
1309                                     struct ethtool_pauseparam *pause)
1310 {
1311         struct dsa_port *dp = dsa_slave_to_port(dev);
1312
1313         return phylink_ethtool_set_pauseparam(dp->pl, pause);
1314 }
1315
1316 #ifdef CONFIG_NET_POLL_CONTROLLER
1317 static int dsa_slave_netpoll_setup(struct net_device *dev,
1318                                    struct netpoll_info *ni)
1319 {
1320         struct net_device *master = dsa_slave_to_master(dev);
1321         struct dsa_slave_priv *p = netdev_priv(dev);
1322         struct netpoll *netpoll;
1323         int err = 0;
1324
1325         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1326         if (!netpoll)
1327                 return -ENOMEM;
1328
1329         err = __netpoll_setup(netpoll, master);
1330         if (err) {
1331                 kfree(netpoll);
1332                 goto out;
1333         }
1334
1335         p->netpoll = netpoll;
1336 out:
1337         return err;
1338 }
1339
1340 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
1341 {
1342         struct dsa_slave_priv *p = netdev_priv(dev);
1343         struct netpoll *netpoll = p->netpoll;
1344
1345         if (!netpoll)
1346                 return;
1347
1348         p->netpoll = NULL;
1349
1350         __netpoll_free(netpoll);
1351 }
1352
1353 static void dsa_slave_poll_controller(struct net_device *dev)
1354 {
1355 }
1356 #endif
1357
1358 static struct dsa_mall_tc_entry *
1359 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
1360 {
1361         struct dsa_slave_priv *p = netdev_priv(dev);
1362         struct dsa_mall_tc_entry *mall_tc_entry;
1363
1364         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
1365                 if (mall_tc_entry->cookie == cookie)
1366                         return mall_tc_entry;
1367
1368         return NULL;
1369 }
1370
1371 static int
1372 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
1373                                   struct tc_cls_matchall_offload *cls,
1374                                   bool ingress)
1375 {
1376         struct netlink_ext_ack *extack = cls->common.extack;
1377         struct dsa_port *dp = dsa_slave_to_port(dev);
1378         struct dsa_slave_priv *p = netdev_priv(dev);
1379         struct dsa_mall_mirror_tc_entry *mirror;
1380         struct dsa_mall_tc_entry *mall_tc_entry;
1381         struct dsa_switch *ds = dp->ds;
1382         struct flow_action_entry *act;
1383         struct dsa_port *to_dp;
1384         int err;
1385
1386         if (!ds->ops->port_mirror_add)
1387                 return -EOPNOTSUPP;
1388
1389         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1390                                               cls->common.extack))
1391                 return -EOPNOTSUPP;
1392
1393         act = &cls->rule->action.entries[0];
1394
1395         if (!act->dev)
1396                 return -EINVAL;
1397
1398         if (!dsa_slave_dev_check(act->dev))
1399                 return -EOPNOTSUPP;
1400
1401         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1402         if (!mall_tc_entry)
1403                 return -ENOMEM;
1404
1405         mall_tc_entry->cookie = cls->cookie;
1406         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1407         mirror = &mall_tc_entry->mirror;
1408
1409         to_dp = dsa_slave_to_port(act->dev);
1410
1411         mirror->to_local_port = to_dp->index;
1412         mirror->ingress = ingress;
1413
1414         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress, extack);
1415         if (err) {
1416                 kfree(mall_tc_entry);
1417                 return err;
1418         }
1419
1420         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1421
1422         return err;
1423 }
1424
1425 static int
1426 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1427                                   struct tc_cls_matchall_offload *cls,
1428                                   bool ingress)
1429 {
1430         struct netlink_ext_ack *extack = cls->common.extack;
1431         struct dsa_port *dp = dsa_slave_to_port(dev);
1432         struct dsa_slave_priv *p = netdev_priv(dev);
1433         struct dsa_mall_policer_tc_entry *policer;
1434         struct dsa_mall_tc_entry *mall_tc_entry;
1435         struct dsa_switch *ds = dp->ds;
1436         struct flow_action_entry *act;
1437         int err;
1438
1439         if (!ds->ops->port_policer_add) {
1440                 NL_SET_ERR_MSG_MOD(extack,
1441                                    "Policing offload not implemented");
1442                 return -EOPNOTSUPP;
1443         }
1444
1445         if (!ingress) {
1446                 NL_SET_ERR_MSG_MOD(extack,
1447                                    "Only supported on ingress qdisc");
1448                 return -EOPNOTSUPP;
1449         }
1450
1451         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1452                                               cls->common.extack))
1453                 return -EOPNOTSUPP;
1454
1455         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1456                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1457                         NL_SET_ERR_MSG_MOD(extack,
1458                                            "Only one port policer allowed");
1459                         return -EEXIST;
1460                 }
1461         }
1462
1463         act = &cls->rule->action.entries[0];
1464
1465         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1466         if (!mall_tc_entry)
1467                 return -ENOMEM;
1468
1469         mall_tc_entry->cookie = cls->cookie;
1470         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1471         policer = &mall_tc_entry->policer;
1472         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1473         policer->burst = act->police.burst;
1474
1475         err = ds->ops->port_policer_add(ds, dp->index, policer);
1476         if (err) {
1477                 kfree(mall_tc_entry);
1478                 return err;
1479         }
1480
1481         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1482
1483         return err;
1484 }
1485
1486 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1487                                       struct tc_cls_matchall_offload *cls,
1488                                       bool ingress)
1489 {
1490         int err = -EOPNOTSUPP;
1491
1492         if (cls->common.protocol == htons(ETH_P_ALL) &&
1493             flow_offload_has_one_action(&cls->rule->action) &&
1494             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1495                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1496         else if (flow_offload_has_one_action(&cls->rule->action) &&
1497                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1498                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1499
1500         return err;
1501 }
1502
1503 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1504                                        struct tc_cls_matchall_offload *cls)
1505 {
1506         struct dsa_port *dp = dsa_slave_to_port(dev);
1507         struct dsa_mall_tc_entry *mall_tc_entry;
1508         struct dsa_switch *ds = dp->ds;
1509
1510         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1511         if (!mall_tc_entry)
1512                 return;
1513
1514         list_del(&mall_tc_entry->list);
1515
1516         switch (mall_tc_entry->type) {
1517         case DSA_PORT_MALL_MIRROR:
1518                 if (ds->ops->port_mirror_del)
1519                         ds->ops->port_mirror_del(ds, dp->index,
1520                                                  &mall_tc_entry->mirror);
1521                 break;
1522         case DSA_PORT_MALL_POLICER:
1523                 if (ds->ops->port_policer_del)
1524                         ds->ops->port_policer_del(ds, dp->index);
1525                 break;
1526         default:
1527                 WARN_ON(1);
1528         }
1529
1530         kfree(mall_tc_entry);
1531 }
1532
1533 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1534                                            struct tc_cls_matchall_offload *cls,
1535                                            bool ingress)
1536 {
1537         if (cls->common.chain_index)
1538                 return -EOPNOTSUPP;
1539
1540         switch (cls->command) {
1541         case TC_CLSMATCHALL_REPLACE:
1542                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1543         case TC_CLSMATCHALL_DESTROY:
1544                 dsa_slave_del_cls_matchall(dev, cls);
1545                 return 0;
1546         default:
1547                 return -EOPNOTSUPP;
1548         }
1549 }
1550
1551 static int dsa_slave_add_cls_flower(struct net_device *dev,
1552                                     struct flow_cls_offload *cls,
1553                                     bool ingress)
1554 {
1555         struct dsa_port *dp = dsa_slave_to_port(dev);
1556         struct dsa_switch *ds = dp->ds;
1557         int port = dp->index;
1558
1559         if (!ds->ops->cls_flower_add)
1560                 return -EOPNOTSUPP;
1561
1562         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1563 }
1564
1565 static int dsa_slave_del_cls_flower(struct net_device *dev,
1566                                     struct flow_cls_offload *cls,
1567                                     bool ingress)
1568 {
1569         struct dsa_port *dp = dsa_slave_to_port(dev);
1570         struct dsa_switch *ds = dp->ds;
1571         int port = dp->index;
1572
1573         if (!ds->ops->cls_flower_del)
1574                 return -EOPNOTSUPP;
1575
1576         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1577 }
1578
1579 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1580                                       struct flow_cls_offload *cls,
1581                                       bool ingress)
1582 {
1583         struct dsa_port *dp = dsa_slave_to_port(dev);
1584         struct dsa_switch *ds = dp->ds;
1585         int port = dp->index;
1586
1587         if (!ds->ops->cls_flower_stats)
1588                 return -EOPNOTSUPP;
1589
1590         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1591 }
1592
1593 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1594                                          struct flow_cls_offload *cls,
1595                                          bool ingress)
1596 {
1597         switch (cls->command) {
1598         case FLOW_CLS_REPLACE:
1599                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1600         case FLOW_CLS_DESTROY:
1601                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1602         case FLOW_CLS_STATS:
1603                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1604         default:
1605                 return -EOPNOTSUPP;
1606         }
1607 }
1608
1609 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1610                                        void *cb_priv, bool ingress)
1611 {
1612         struct net_device *dev = cb_priv;
1613
1614         if (!tc_can_offload(dev))
1615                 return -EOPNOTSUPP;
1616
1617         switch (type) {
1618         case TC_SETUP_CLSMATCHALL:
1619                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1620         case TC_SETUP_CLSFLOWER:
1621                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1622         default:
1623                 return -EOPNOTSUPP;
1624         }
1625 }
1626
1627 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1628                                           void *type_data, void *cb_priv)
1629 {
1630         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1631 }
1632
1633 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1634                                           void *type_data, void *cb_priv)
1635 {
1636         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1637 }
1638
1639 static LIST_HEAD(dsa_slave_block_cb_list);
1640
1641 static int dsa_slave_setup_tc_block(struct net_device *dev,
1642                                     struct flow_block_offload *f)
1643 {
1644         struct flow_block_cb *block_cb;
1645         flow_setup_cb_t *cb;
1646
1647         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1648                 cb = dsa_slave_setup_tc_block_cb_ig;
1649         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1650                 cb = dsa_slave_setup_tc_block_cb_eg;
1651         else
1652                 return -EOPNOTSUPP;
1653
1654         f->driver_block_list = &dsa_slave_block_cb_list;
1655
1656         switch (f->command) {
1657         case FLOW_BLOCK_BIND:
1658                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1659                         return -EBUSY;
1660
1661                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1662                 if (IS_ERR(block_cb))
1663                         return PTR_ERR(block_cb);
1664
1665                 flow_block_cb_add(block_cb, f);
1666                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1667                 return 0;
1668         case FLOW_BLOCK_UNBIND:
1669                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1670                 if (!block_cb)
1671                         return -ENOENT;
1672
1673                 flow_block_cb_remove(block_cb, f);
1674                 list_del(&block_cb->driver_list);
1675                 return 0;
1676         default:
1677                 return -EOPNOTSUPP;
1678         }
1679 }
1680
1681 static int dsa_slave_setup_ft_block(struct dsa_switch *ds, int port,
1682                                     void *type_data)
1683 {
1684         struct net_device *master = dsa_port_to_master(dsa_to_port(ds, port));
1685
1686         if (!master->netdev_ops->ndo_setup_tc)
1687                 return -EOPNOTSUPP;
1688
1689         return master->netdev_ops->ndo_setup_tc(master, TC_SETUP_FT, type_data);
1690 }
1691
1692 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1693                               void *type_data)
1694 {
1695         struct dsa_port *dp = dsa_slave_to_port(dev);
1696         struct dsa_switch *ds = dp->ds;
1697
1698         switch (type) {
1699         case TC_SETUP_BLOCK:
1700                 return dsa_slave_setup_tc_block(dev, type_data);
1701         case TC_SETUP_FT:
1702                 return dsa_slave_setup_ft_block(ds, dp->index, type_data);
1703         default:
1704                 break;
1705         }
1706
1707         if (!ds->ops->port_setup_tc)
1708                 return -EOPNOTSUPP;
1709
1710         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1711 }
1712
1713 static int dsa_slave_get_rxnfc(struct net_device *dev,
1714                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1715 {
1716         struct dsa_port *dp = dsa_slave_to_port(dev);
1717         struct dsa_switch *ds = dp->ds;
1718
1719         if (!ds->ops->get_rxnfc)
1720                 return -EOPNOTSUPP;
1721
1722         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1723 }
1724
1725 static int dsa_slave_set_rxnfc(struct net_device *dev,
1726                                struct ethtool_rxnfc *nfc)
1727 {
1728         struct dsa_port *dp = dsa_slave_to_port(dev);
1729         struct dsa_switch *ds = dp->ds;
1730
1731         if (!ds->ops->set_rxnfc)
1732                 return -EOPNOTSUPP;
1733
1734         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1735 }
1736
1737 static int dsa_slave_get_ts_info(struct net_device *dev,
1738                                  struct ethtool_ts_info *ts)
1739 {
1740         struct dsa_slave_priv *p = netdev_priv(dev);
1741         struct dsa_switch *ds = p->dp->ds;
1742
1743         if (!ds->ops->get_ts_info)
1744                 return -EOPNOTSUPP;
1745
1746         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1747 }
1748
1749 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1750                                      u16 vid)
1751 {
1752         struct dsa_port *dp = dsa_slave_to_port(dev);
1753         struct switchdev_obj_port_vlan vlan = {
1754                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1755                 .vid = vid,
1756                 /* This API only allows programming tagged, non-PVID VIDs */
1757                 .flags = 0,
1758         };
1759         struct netlink_ext_ack extack = {0};
1760         struct dsa_switch *ds = dp->ds;
1761         struct netdev_hw_addr *ha;
1762         int ret;
1763
1764         /* User port... */
1765         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1766         if (ret) {
1767                 if (extack._msg)
1768                         netdev_err(dev, "%s\n", extack._msg);
1769                 return ret;
1770         }
1771
1772         /* And CPU port... */
1773         ret = dsa_port_host_vlan_add(dp, &vlan, &extack);
1774         if (ret) {
1775                 if (extack._msg)
1776                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1777                                    extack._msg);
1778                 return ret;
1779         }
1780
1781         if (!dsa_switch_supports_uc_filtering(ds) &&
1782             !dsa_switch_supports_mc_filtering(ds))
1783                 return 0;
1784
1785         netif_addr_lock_bh(dev);
1786
1787         if (dsa_switch_supports_mc_filtering(ds)) {
1788                 netdev_for_each_synced_mc_addr(ha, dev) {
1789                         dsa_slave_schedule_standalone_work(dev, DSA_MC_ADD,
1790                                                            ha->addr, vid);
1791                 }
1792         }
1793
1794         if (dsa_switch_supports_uc_filtering(ds)) {
1795                 netdev_for_each_synced_uc_addr(ha, dev) {
1796                         dsa_slave_schedule_standalone_work(dev, DSA_UC_ADD,
1797                                                            ha->addr, vid);
1798                 }
1799         }
1800
1801         netif_addr_unlock_bh(dev);
1802
1803         dsa_flush_workqueue();
1804
1805         return 0;
1806 }
1807
1808 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1809                                       u16 vid)
1810 {
1811         struct dsa_port *dp = dsa_slave_to_port(dev);
1812         struct switchdev_obj_port_vlan vlan = {
1813                 .vid = vid,
1814                 /* This API only allows programming tagged, non-PVID VIDs */
1815                 .flags = 0,
1816         };
1817         struct dsa_switch *ds = dp->ds;
1818         struct netdev_hw_addr *ha;
1819         int err;
1820
1821         err = dsa_port_vlan_del(dp, &vlan);
1822         if (err)
1823                 return err;
1824
1825         err = dsa_port_host_vlan_del(dp, &vlan);
1826         if (err)
1827                 return err;
1828
1829         if (!dsa_switch_supports_uc_filtering(ds) &&
1830             !dsa_switch_supports_mc_filtering(ds))
1831                 return 0;
1832
1833         netif_addr_lock_bh(dev);
1834
1835         if (dsa_switch_supports_mc_filtering(ds)) {
1836                 netdev_for_each_synced_mc_addr(ha, dev) {
1837                         dsa_slave_schedule_standalone_work(dev, DSA_MC_DEL,
1838                                                            ha->addr, vid);
1839                 }
1840         }
1841
1842         if (dsa_switch_supports_uc_filtering(ds)) {
1843                 netdev_for_each_synced_uc_addr(ha, dev) {
1844                         dsa_slave_schedule_standalone_work(dev, DSA_UC_DEL,
1845                                                            ha->addr, vid);
1846                 }
1847         }
1848
1849         netif_addr_unlock_bh(dev);
1850
1851         dsa_flush_workqueue();
1852
1853         return 0;
1854 }
1855
1856 static int dsa_slave_restore_vlan(struct net_device *vdev, int vid, void *arg)
1857 {
1858         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1859
1860         return dsa_slave_vlan_rx_add_vid(arg, proto, vid);
1861 }
1862
1863 static int dsa_slave_clear_vlan(struct net_device *vdev, int vid, void *arg)
1864 {
1865         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1866
1867         return dsa_slave_vlan_rx_kill_vid(arg, proto, vid);
1868 }
1869
1870 /* Keep the VLAN RX filtering list in sync with the hardware only if VLAN
1871  * filtering is enabled. The baseline is that only ports that offload a
1872  * VLAN-aware bridge are VLAN-aware, and standalone ports are VLAN-unaware,
1873  * but there are exceptions for quirky hardware.
1874  *
1875  * If ds->vlan_filtering_is_global = true, then standalone ports which share
1876  * the same switch with other ports that offload a VLAN-aware bridge are also
1877  * inevitably VLAN-aware.
1878  *
1879  * To summarize, a DSA switch port offloads:
1880  *
1881  * - If standalone (this includes software bridge, software LAG):
1882  *     - if ds->needs_standalone_vlan_filtering = true, OR if
1883  *       (ds->vlan_filtering_is_global = true AND there are bridges spanning
1884  *       this switch chip which have vlan_filtering=1)
1885  *         - the 8021q upper VLANs
1886  *     - else (standalone VLAN filtering is not needed, VLAN filtering is not
1887  *       global, or it is, but no port is under a VLAN-aware bridge):
1888  *         - no VLAN (any 8021q upper is a software VLAN)
1889  *
1890  * - If under a vlan_filtering=0 bridge which it offload:
1891  *     - if ds->configure_vlan_while_not_filtering = true (default):
1892  *         - the bridge VLANs. These VLANs are committed to hardware but inactive.
1893  *     - else (deprecated):
1894  *         - no VLAN. The bridge VLANs are not restored when VLAN awareness is
1895  *           enabled, so this behavior is broken and discouraged.
1896  *
1897  * - If under a vlan_filtering=1 bridge which it offload:
1898  *     - the bridge VLANs
1899  *     - the 8021q upper VLANs
1900  */
1901 int dsa_slave_manage_vlan_filtering(struct net_device *slave,
1902                                     bool vlan_filtering)
1903 {
1904         int err;
1905
1906         if (vlan_filtering) {
1907                 slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1908
1909                 err = vlan_for_each(slave, dsa_slave_restore_vlan, slave);
1910                 if (err) {
1911                         vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1912                         slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1913                         return err;
1914                 }
1915         } else {
1916                 err = vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1917                 if (err)
1918                         return err;
1919
1920                 slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1921         }
1922
1923         return 0;
1924 }
1925
1926 struct dsa_hw_port {
1927         struct list_head list;
1928         struct net_device *dev;
1929         int old_mtu;
1930 };
1931
1932 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1933 {
1934         const struct dsa_hw_port *p;
1935         int err;
1936
1937         list_for_each_entry(p, hw_port_list, list) {
1938                 if (p->dev->mtu == mtu)
1939                         continue;
1940
1941                 err = dev_set_mtu(p->dev, mtu);
1942                 if (err)
1943                         goto rollback;
1944         }
1945
1946         return 0;
1947
1948 rollback:
1949         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1950                 if (p->dev->mtu == p->old_mtu)
1951                         continue;
1952
1953                 if (dev_set_mtu(p->dev, p->old_mtu))
1954                         netdev_err(p->dev, "Failed to restore MTU\n");
1955         }
1956
1957         return err;
1958 }
1959
1960 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1961 {
1962         struct dsa_hw_port *p, *n;
1963
1964         list_for_each_entry_safe(p, n, hw_port_list, list)
1965                 kfree(p);
1966 }
1967
1968 /* Make the hardware datapath to/from @dev limited to a common MTU */
1969 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1970 {
1971         struct list_head hw_port_list;
1972         struct dsa_switch_tree *dst;
1973         int min_mtu = ETH_MAX_MTU;
1974         struct dsa_port *other_dp;
1975         int err;
1976
1977         if (!dp->ds->mtu_enforcement_ingress)
1978                 return;
1979
1980         if (!dp->bridge)
1981                 return;
1982
1983         INIT_LIST_HEAD(&hw_port_list);
1984
1985         /* Populate the list of ports that are part of the same bridge
1986          * as the newly added/modified port
1987          */
1988         list_for_each_entry(dst, &dsa_tree_list, list) {
1989                 list_for_each_entry(other_dp, &dst->ports, list) {
1990                         struct dsa_hw_port *hw_port;
1991                         struct net_device *slave;
1992
1993                         if (other_dp->type != DSA_PORT_TYPE_USER)
1994                                 continue;
1995
1996                         if (!dsa_port_bridge_same(dp, other_dp))
1997                                 continue;
1998
1999                         if (!other_dp->ds->mtu_enforcement_ingress)
2000                                 continue;
2001
2002                         slave = other_dp->slave;
2003
2004                         if (min_mtu > slave->mtu)
2005                                 min_mtu = slave->mtu;
2006
2007                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
2008                         if (!hw_port)
2009                                 goto out;
2010
2011                         hw_port->dev = slave;
2012                         hw_port->old_mtu = slave->mtu;
2013
2014                         list_add(&hw_port->list, &hw_port_list);
2015                 }
2016         }
2017
2018         /* Attempt to configure the entire hardware bridge to the newly added
2019          * interface's MTU first, regardless of whether the intention of the
2020          * user was to raise or lower it.
2021          */
2022         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
2023         if (!err)
2024                 goto out;
2025
2026         /* Clearly that didn't work out so well, so just set the minimum MTU on
2027          * all hardware bridge ports now. If this fails too, then all ports will
2028          * still have their old MTU rolled back anyway.
2029          */
2030         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
2031
2032 out:
2033         dsa_hw_port_list_free(&hw_port_list);
2034 }
2035
2036 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
2037 {
2038         struct net_device *master = dsa_slave_to_master(dev);
2039         struct dsa_port *dp = dsa_slave_to_port(dev);
2040         struct dsa_port *cpu_dp = dp->cpu_dp;
2041         struct dsa_switch *ds = dp->ds;
2042         struct dsa_port *other_dp;
2043         int largest_mtu = 0;
2044         int new_master_mtu;
2045         int old_master_mtu;
2046         int mtu_limit;
2047         int overhead;
2048         int cpu_mtu;
2049         int err;
2050
2051         if (!ds->ops->port_change_mtu)
2052                 return -EOPNOTSUPP;
2053
2054         dsa_tree_for_each_user_port(other_dp, ds->dst) {
2055                 int slave_mtu;
2056
2057                 /* During probe, this function will be called for each slave
2058                  * device, while not all of them have been allocated. That's
2059                  * ok, it doesn't change what the maximum is, so ignore it.
2060                  */
2061                 if (!other_dp->slave)
2062                         continue;
2063
2064                 /* Pretend that we already applied the setting, which we
2065                  * actually haven't (still haven't done all integrity checks)
2066                  */
2067                 if (dp == other_dp)
2068                         slave_mtu = new_mtu;
2069                 else
2070                         slave_mtu = other_dp->slave->mtu;
2071
2072                 if (largest_mtu < slave_mtu)
2073                         largest_mtu = slave_mtu;
2074         }
2075
2076         overhead = dsa_tag_protocol_overhead(cpu_dp->tag_ops);
2077         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu + overhead);
2078         old_master_mtu = master->mtu;
2079         new_master_mtu = largest_mtu + overhead;
2080         if (new_master_mtu > mtu_limit)
2081                 return -ERANGE;
2082
2083         /* If the master MTU isn't over limit, there's no need to check the CPU
2084          * MTU, since that surely isn't either.
2085          */
2086         cpu_mtu = largest_mtu;
2087
2088         /* Start applying stuff */
2089         if (new_master_mtu != old_master_mtu) {
2090                 err = dev_set_mtu(master, new_master_mtu);
2091                 if (err < 0)
2092                         goto out_master_failed;
2093
2094                 /* We only need to propagate the MTU of the CPU port to
2095                  * upstream switches, so emit a notifier which updates them.
2096                  */
2097                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu);
2098                 if (err)
2099                         goto out_cpu_failed;
2100         }
2101
2102         err = ds->ops->port_change_mtu(ds, dp->index, new_mtu);
2103         if (err)
2104                 goto out_port_failed;
2105
2106         dev->mtu = new_mtu;
2107
2108         dsa_bridge_mtu_normalization(dp);
2109
2110         return 0;
2111
2112 out_port_failed:
2113         if (new_master_mtu != old_master_mtu)
2114                 dsa_port_mtu_change(cpu_dp, old_master_mtu - overhead);
2115 out_cpu_failed:
2116         if (new_master_mtu != old_master_mtu)
2117                 dev_set_mtu(master, old_master_mtu);
2118 out_master_failed:
2119         return err;
2120 }
2121
2122 static int __maybe_unused
2123 dsa_slave_dcbnl_set_default_prio(struct net_device *dev, struct dcb_app *app)
2124 {
2125         struct dsa_port *dp = dsa_slave_to_port(dev);
2126         struct dsa_switch *ds = dp->ds;
2127         unsigned long mask, new_prio;
2128         int err, port = dp->index;
2129
2130         if (!ds->ops->port_set_default_prio)
2131                 return -EOPNOTSUPP;
2132
2133         err = dcb_ieee_setapp(dev, app);
2134         if (err)
2135                 return err;
2136
2137         mask = dcb_ieee_getapp_mask(dev, app);
2138         new_prio = __fls(mask);
2139
2140         err = ds->ops->port_set_default_prio(ds, port, new_prio);
2141         if (err) {
2142                 dcb_ieee_delapp(dev, app);
2143                 return err;
2144         }
2145
2146         return 0;
2147 }
2148
2149 static int __maybe_unused
2150 dsa_slave_dcbnl_add_dscp_prio(struct net_device *dev, struct dcb_app *app)
2151 {
2152         struct dsa_port *dp = dsa_slave_to_port(dev);
2153         struct dsa_switch *ds = dp->ds;
2154         unsigned long mask, new_prio;
2155         int err, port = dp->index;
2156         u8 dscp = app->protocol;
2157
2158         if (!ds->ops->port_add_dscp_prio)
2159                 return -EOPNOTSUPP;
2160
2161         if (dscp >= 64) {
2162                 netdev_err(dev, "DSCP APP entry with protocol value %u is invalid\n",
2163                            dscp);
2164                 return -EINVAL;
2165         }
2166
2167         err = dcb_ieee_setapp(dev, app);
2168         if (err)
2169                 return err;
2170
2171         mask = dcb_ieee_getapp_mask(dev, app);
2172         new_prio = __fls(mask);
2173
2174         err = ds->ops->port_add_dscp_prio(ds, port, dscp, new_prio);
2175         if (err) {
2176                 dcb_ieee_delapp(dev, app);
2177                 return err;
2178         }
2179
2180         return 0;
2181 }
2182
2183 static int __maybe_unused dsa_slave_dcbnl_ieee_setapp(struct net_device *dev,
2184                                                       struct dcb_app *app)
2185 {
2186         switch (app->selector) {
2187         case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
2188                 switch (app->protocol) {
2189                 case 0:
2190                         return dsa_slave_dcbnl_set_default_prio(dev, app);
2191                 default:
2192                         return -EOPNOTSUPP;
2193                 }
2194                 break;
2195         case IEEE_8021QAZ_APP_SEL_DSCP:
2196                 return dsa_slave_dcbnl_add_dscp_prio(dev, app);
2197         default:
2198                 return -EOPNOTSUPP;
2199         }
2200 }
2201
2202 static int __maybe_unused
2203 dsa_slave_dcbnl_del_default_prio(struct net_device *dev, struct dcb_app *app)
2204 {
2205         struct dsa_port *dp = dsa_slave_to_port(dev);
2206         struct dsa_switch *ds = dp->ds;
2207         unsigned long mask, new_prio;
2208         int err, port = dp->index;
2209
2210         if (!ds->ops->port_set_default_prio)
2211                 return -EOPNOTSUPP;
2212
2213         err = dcb_ieee_delapp(dev, app);
2214         if (err)
2215                 return err;
2216
2217         mask = dcb_ieee_getapp_mask(dev, app);
2218         new_prio = mask ? __fls(mask) : 0;
2219
2220         err = ds->ops->port_set_default_prio(ds, port, new_prio);
2221         if (err) {
2222                 dcb_ieee_setapp(dev, app);
2223                 return err;
2224         }
2225
2226         return 0;
2227 }
2228
2229 static int __maybe_unused
2230 dsa_slave_dcbnl_del_dscp_prio(struct net_device *dev, struct dcb_app *app)
2231 {
2232         struct dsa_port *dp = dsa_slave_to_port(dev);
2233         struct dsa_switch *ds = dp->ds;
2234         int err, port = dp->index;
2235         u8 dscp = app->protocol;
2236
2237         if (!ds->ops->port_del_dscp_prio)
2238                 return -EOPNOTSUPP;
2239
2240         err = dcb_ieee_delapp(dev, app);
2241         if (err)
2242                 return err;
2243
2244         err = ds->ops->port_del_dscp_prio(ds, port, dscp, app->priority);
2245         if (err) {
2246                 dcb_ieee_setapp(dev, app);
2247                 return err;
2248         }
2249
2250         return 0;
2251 }
2252
2253 static int __maybe_unused dsa_slave_dcbnl_ieee_delapp(struct net_device *dev,
2254                                                       struct dcb_app *app)
2255 {
2256         switch (app->selector) {
2257         case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
2258                 switch (app->protocol) {
2259                 case 0:
2260                         return dsa_slave_dcbnl_del_default_prio(dev, app);
2261                 default:
2262                         return -EOPNOTSUPP;
2263                 }
2264                 break;
2265         case IEEE_8021QAZ_APP_SEL_DSCP:
2266                 return dsa_slave_dcbnl_del_dscp_prio(dev, app);
2267         default:
2268                 return -EOPNOTSUPP;
2269         }
2270 }
2271
2272 /* Pre-populate the DCB application priority table with the priorities
2273  * configured during switch setup, which we read from hardware here.
2274  */
2275 static int dsa_slave_dcbnl_init(struct net_device *dev)
2276 {
2277         struct dsa_port *dp = dsa_slave_to_port(dev);
2278         struct dsa_switch *ds = dp->ds;
2279         int port = dp->index;
2280         int err;
2281
2282         if (ds->ops->port_get_default_prio) {
2283                 int prio = ds->ops->port_get_default_prio(ds, port);
2284                 struct dcb_app app = {
2285                         .selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE,
2286                         .protocol = 0,
2287                         .priority = prio,
2288                 };
2289
2290                 if (prio < 0)
2291                         return prio;
2292
2293                 err = dcb_ieee_setapp(dev, &app);
2294                 if (err)
2295                         return err;
2296         }
2297
2298         if (ds->ops->port_get_dscp_prio) {
2299                 int protocol;
2300
2301                 for (protocol = 0; protocol < 64; protocol++) {
2302                         struct dcb_app app = {
2303                                 .selector = IEEE_8021QAZ_APP_SEL_DSCP,
2304                                 .protocol = protocol,
2305                         };
2306                         int prio;
2307
2308                         prio = ds->ops->port_get_dscp_prio(ds, port, protocol);
2309                         if (prio == -EOPNOTSUPP)
2310                                 continue;
2311                         if (prio < 0)
2312                                 return prio;
2313
2314                         app.priority = prio;
2315
2316                         err = dcb_ieee_setapp(dev, &app);
2317                         if (err)
2318                                 return err;
2319                 }
2320         }
2321
2322         return 0;
2323 }
2324
2325 static const struct ethtool_ops dsa_slave_ethtool_ops = {
2326         .get_drvinfo            = dsa_slave_get_drvinfo,
2327         .get_regs_len           = dsa_slave_get_regs_len,
2328         .get_regs               = dsa_slave_get_regs,
2329         .nway_reset             = dsa_slave_nway_reset,
2330         .get_link               = ethtool_op_get_link,
2331         .get_eeprom_len         = dsa_slave_get_eeprom_len,
2332         .get_eeprom             = dsa_slave_get_eeprom,
2333         .set_eeprom             = dsa_slave_set_eeprom,
2334         .get_strings            = dsa_slave_get_strings,
2335         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
2336         .get_sset_count         = dsa_slave_get_sset_count,
2337         .get_eth_phy_stats      = dsa_slave_get_eth_phy_stats,
2338         .get_eth_mac_stats      = dsa_slave_get_eth_mac_stats,
2339         .get_eth_ctrl_stats     = dsa_slave_get_eth_ctrl_stats,
2340         .get_rmon_stats         = dsa_slave_get_rmon_stats,
2341         .set_wol                = dsa_slave_set_wol,
2342         .get_wol                = dsa_slave_get_wol,
2343         .set_eee                = dsa_slave_set_eee,
2344         .get_eee                = dsa_slave_get_eee,
2345         .get_link_ksettings     = dsa_slave_get_link_ksettings,
2346         .set_link_ksettings     = dsa_slave_set_link_ksettings,
2347         .get_pause_stats        = dsa_slave_get_pause_stats,
2348         .get_pauseparam         = dsa_slave_get_pauseparam,
2349         .set_pauseparam         = dsa_slave_set_pauseparam,
2350         .get_rxnfc              = dsa_slave_get_rxnfc,
2351         .set_rxnfc              = dsa_slave_set_rxnfc,
2352         .get_ts_info            = dsa_slave_get_ts_info,
2353         .self_test              = dsa_slave_net_selftest,
2354         .get_mm                 = dsa_slave_get_mm,
2355         .set_mm                 = dsa_slave_set_mm,
2356         .get_mm_stats           = dsa_slave_get_mm_stats,
2357 };
2358
2359 static const struct dcbnl_rtnl_ops __maybe_unused dsa_slave_dcbnl_ops = {
2360         .ieee_setapp            = dsa_slave_dcbnl_ieee_setapp,
2361         .ieee_delapp            = dsa_slave_dcbnl_ieee_delapp,
2362 };
2363
2364 static void dsa_slave_get_stats64(struct net_device *dev,
2365                                   struct rtnl_link_stats64 *s)
2366 {
2367         struct dsa_port *dp = dsa_slave_to_port(dev);
2368         struct dsa_switch *ds = dp->ds;
2369
2370         if (ds->ops->get_stats64)
2371                 ds->ops->get_stats64(ds, dp->index, s);
2372         else
2373                 dev_get_tstats64(dev, s);
2374 }
2375
2376 static int dsa_slave_fill_forward_path(struct net_device_path_ctx *ctx,
2377                                        struct net_device_path *path)
2378 {
2379         struct dsa_port *dp = dsa_slave_to_port(ctx->dev);
2380         struct net_device *master = dsa_port_to_master(dp);
2381         struct dsa_port *cpu_dp = dp->cpu_dp;
2382
2383         path->dev = ctx->dev;
2384         path->type = DEV_PATH_DSA;
2385         path->dsa.proto = cpu_dp->tag_ops->proto;
2386         path->dsa.port = dp->index;
2387         ctx->dev = master;
2388
2389         return 0;
2390 }
2391
2392 static const struct net_device_ops dsa_slave_netdev_ops = {
2393         .ndo_open               = dsa_slave_open,
2394         .ndo_stop               = dsa_slave_close,
2395         .ndo_start_xmit         = dsa_slave_xmit,
2396         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
2397         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
2398         .ndo_set_mac_address    = dsa_slave_set_mac_address,
2399         .ndo_fdb_dump           = dsa_slave_fdb_dump,
2400         .ndo_eth_ioctl          = dsa_slave_ioctl,
2401         .ndo_get_iflink         = dsa_slave_get_iflink,
2402 #ifdef CONFIG_NET_POLL_CONTROLLER
2403         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
2404         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
2405         .ndo_poll_controller    = dsa_slave_poll_controller,
2406 #endif
2407         .ndo_setup_tc           = dsa_slave_setup_tc,
2408         .ndo_get_stats64        = dsa_slave_get_stats64,
2409         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
2410         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
2411         .ndo_change_mtu         = dsa_slave_change_mtu,
2412         .ndo_fill_forward_path  = dsa_slave_fill_forward_path,
2413 };
2414
2415 static struct device_type dsa_type = {
2416         .name   = "dsa",
2417 };
2418
2419 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
2420 {
2421         const struct dsa_port *dp = dsa_to_port(ds, port);
2422
2423         if (dp->pl)
2424                 phylink_mac_change(dp->pl, up);
2425 }
2426 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
2427
2428 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
2429                                           struct phylink_link_state *state)
2430 {
2431         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
2432         struct dsa_switch *ds = dp->ds;
2433
2434         /* No need to check that this operation is valid, the callback would
2435          * not be called if it was not.
2436          */
2437         ds->ops->phylink_fixed_state(ds, dp->index, state);
2438 }
2439
2440 /* slave device setup *******************************************************/
2441 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr,
2442                                  u32 flags)
2443 {
2444         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2445         struct dsa_switch *ds = dp->ds;
2446
2447         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
2448         if (!slave_dev->phydev) {
2449                 netdev_err(slave_dev, "no phy at %d\n", addr);
2450                 return -ENODEV;
2451         }
2452
2453         slave_dev->phydev->dev_flags |= flags;
2454
2455         return phylink_connect_phy(dp->pl, slave_dev->phydev);
2456 }
2457
2458 static int dsa_slave_phy_setup(struct net_device *slave_dev)
2459 {
2460         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2461         struct device_node *port_dn = dp->dn;
2462         struct dsa_switch *ds = dp->ds;
2463         u32 phy_flags = 0;
2464         int ret;
2465
2466         dp->pl_config.dev = &slave_dev->dev;
2467         dp->pl_config.type = PHYLINK_NETDEV;
2468
2469         /* The get_fixed_state callback takes precedence over polling the
2470          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
2471          * this if the switch provides such a callback.
2472          */
2473         if (ds->ops->phylink_fixed_state) {
2474                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
2475                 dp->pl_config.poll_fixed_state = true;
2476         }
2477
2478         ret = dsa_port_phylink_create(dp);
2479         if (ret)
2480                 return ret;
2481
2482         if (ds->ops->get_phy_flags)
2483                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
2484
2485         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
2486         if (ret == -ENODEV && ds->slave_mii_bus) {
2487                 /* We could not connect to a designated PHY or SFP, so try to
2488                  * use the switch internal MDIO bus instead
2489                  */
2490                 ret = dsa_slave_phy_connect(slave_dev, dp->index, phy_flags);
2491         }
2492         if (ret) {
2493                 netdev_err(slave_dev, "failed to connect to PHY: %pe\n",
2494                            ERR_PTR(ret));
2495                 dsa_port_phylink_destroy(dp);
2496         }
2497
2498         return ret;
2499 }
2500
2501 void dsa_slave_setup_tagger(struct net_device *slave)
2502 {
2503         struct dsa_port *dp = dsa_slave_to_port(slave);
2504         struct net_device *master = dsa_port_to_master(dp);
2505         struct dsa_slave_priv *p = netdev_priv(slave);
2506         const struct dsa_port *cpu_dp = dp->cpu_dp;
2507         const struct dsa_switch *ds = dp->ds;
2508
2509         slave->needed_headroom = cpu_dp->tag_ops->needed_headroom;
2510         slave->needed_tailroom = cpu_dp->tag_ops->needed_tailroom;
2511         /* Try to save one extra realloc later in the TX path (in the master)
2512          * by also inheriting the master's needed headroom and tailroom.
2513          * The 8021q driver also does this.
2514          */
2515         slave->needed_headroom += master->needed_headroom;
2516         slave->needed_tailroom += master->needed_tailroom;
2517
2518         p->xmit = cpu_dp->tag_ops->xmit;
2519
2520         slave->features = master->vlan_features | NETIF_F_HW_TC;
2521         slave->hw_features |= NETIF_F_HW_TC;
2522         slave->features |= NETIF_F_LLTX;
2523         if (slave->needed_tailroom)
2524                 slave->features &= ~(NETIF_F_SG | NETIF_F_FRAGLIST);
2525         if (ds->needs_standalone_vlan_filtering)
2526                 slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2527 }
2528
2529 int dsa_slave_suspend(struct net_device *slave_dev)
2530 {
2531         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2532
2533         if (!netif_running(slave_dev))
2534                 return 0;
2535
2536         netif_device_detach(slave_dev);
2537
2538         rtnl_lock();
2539         phylink_stop(dp->pl);
2540         rtnl_unlock();
2541
2542         return 0;
2543 }
2544
2545 int dsa_slave_resume(struct net_device *slave_dev)
2546 {
2547         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2548
2549         if (!netif_running(slave_dev))
2550                 return 0;
2551
2552         netif_device_attach(slave_dev);
2553
2554         rtnl_lock();
2555         phylink_start(dp->pl);
2556         rtnl_unlock();
2557
2558         return 0;
2559 }
2560
2561 int dsa_slave_create(struct dsa_port *port)
2562 {
2563         struct net_device *master = dsa_port_to_master(port);
2564         struct dsa_switch *ds = port->ds;
2565         struct net_device *slave_dev;
2566         struct dsa_slave_priv *p;
2567         const char *name;
2568         int assign_type;
2569         int ret;
2570
2571         if (!ds->num_tx_queues)
2572                 ds->num_tx_queues = 1;
2573
2574         if (port->name) {
2575                 name = port->name;
2576                 assign_type = NET_NAME_PREDICTABLE;
2577         } else {
2578                 name = "eth%d";
2579                 assign_type = NET_NAME_ENUM;
2580         }
2581
2582         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
2583                                      assign_type, ether_setup,
2584                                      ds->num_tx_queues, 1);
2585         if (slave_dev == NULL)
2586                 return -ENOMEM;
2587
2588         slave_dev->rtnl_link_ops = &dsa_link_ops;
2589         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
2590 #if IS_ENABLED(CONFIG_DCB)
2591         slave_dev->dcbnl_ops = &dsa_slave_dcbnl_ops;
2592 #endif
2593         if (!is_zero_ether_addr(port->mac))
2594                 eth_hw_addr_set(slave_dev, port->mac);
2595         else
2596                 eth_hw_addr_inherit(slave_dev, master);
2597         slave_dev->priv_flags |= IFF_NO_QUEUE;
2598         if (dsa_switch_supports_uc_filtering(ds))
2599                 slave_dev->priv_flags |= IFF_UNICAST_FLT;
2600         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
2601         if (ds->ops->port_max_mtu)
2602                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
2603         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
2604
2605         SET_NETDEV_DEV(slave_dev, port->ds->dev);
2606         SET_NETDEV_DEVLINK_PORT(slave_dev, &port->devlink_port);
2607         slave_dev->dev.of_node = port->dn;
2608         slave_dev->vlan_features = master->vlan_features;
2609
2610         p = netdev_priv(slave_dev);
2611         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2612         if (!slave_dev->tstats) {
2613                 free_netdev(slave_dev);
2614                 return -ENOMEM;
2615         }
2616
2617         ret = gro_cells_init(&p->gcells, slave_dev);
2618         if (ret)
2619                 goto out_free;
2620
2621         p->dp = port;
2622         INIT_LIST_HEAD(&p->mall_tc_list);
2623         port->slave = slave_dev;
2624         dsa_slave_setup_tagger(slave_dev);
2625
2626         netif_carrier_off(slave_dev);
2627
2628         ret = dsa_slave_phy_setup(slave_dev);
2629         if (ret) {
2630                 netdev_err(slave_dev,
2631                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
2632                            ret, ds->dst->index, ds->index, port->index);
2633                 goto out_gcells;
2634         }
2635
2636         rtnl_lock();
2637
2638         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
2639         if (ret && ret != -EOPNOTSUPP)
2640                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
2641                          ret, ETH_DATA_LEN, port->index);
2642
2643         ret = register_netdevice(slave_dev);
2644         if (ret) {
2645                 netdev_err(master, "error %d registering interface %s\n",
2646                            ret, slave_dev->name);
2647                 rtnl_unlock();
2648                 goto out_phy;
2649         }
2650
2651         if (IS_ENABLED(CONFIG_DCB)) {
2652                 ret = dsa_slave_dcbnl_init(slave_dev);
2653                 if (ret) {
2654                         netdev_err(slave_dev,
2655                                    "failed to initialize DCB: %pe\n",
2656                                    ERR_PTR(ret));
2657                         rtnl_unlock();
2658                         goto out_unregister;
2659                 }
2660         }
2661
2662         ret = netdev_upper_dev_link(master, slave_dev, NULL);
2663
2664         rtnl_unlock();
2665
2666         if (ret)
2667                 goto out_unregister;
2668
2669         return 0;
2670
2671 out_unregister:
2672         unregister_netdev(slave_dev);
2673 out_phy:
2674         rtnl_lock();
2675         phylink_disconnect_phy(p->dp->pl);
2676         rtnl_unlock();
2677         dsa_port_phylink_destroy(p->dp);
2678 out_gcells:
2679         gro_cells_destroy(&p->gcells);
2680 out_free:
2681         free_percpu(slave_dev->tstats);
2682         free_netdev(slave_dev);
2683         port->slave = NULL;
2684         return ret;
2685 }
2686
2687 void dsa_slave_destroy(struct net_device *slave_dev)
2688 {
2689         struct net_device *master = dsa_slave_to_master(slave_dev);
2690         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2691         struct dsa_slave_priv *p = netdev_priv(slave_dev);
2692
2693         netif_carrier_off(slave_dev);
2694         rtnl_lock();
2695         netdev_upper_dev_unlink(master, slave_dev);
2696         unregister_netdevice(slave_dev);
2697         phylink_disconnect_phy(dp->pl);
2698         rtnl_unlock();
2699
2700         dsa_port_phylink_destroy(dp);
2701         gro_cells_destroy(&p->gcells);
2702         free_percpu(slave_dev->tstats);
2703         free_netdev(slave_dev);
2704 }
2705
2706 int dsa_slave_change_master(struct net_device *dev, struct net_device *master,
2707                             struct netlink_ext_ack *extack)
2708 {
2709         struct net_device *old_master = dsa_slave_to_master(dev);
2710         struct dsa_port *dp = dsa_slave_to_port(dev);
2711         struct dsa_switch *ds = dp->ds;
2712         struct net_device *upper;
2713         struct list_head *iter;
2714         int err;
2715
2716         if (master == old_master)
2717                 return 0;
2718
2719         if (!ds->ops->port_change_master) {
2720                 NL_SET_ERR_MSG_MOD(extack,
2721                                    "Driver does not support changing DSA master");
2722                 return -EOPNOTSUPP;
2723         }
2724
2725         if (!netdev_uses_dsa(master)) {
2726                 NL_SET_ERR_MSG_MOD(extack,
2727                                    "Interface not eligible as DSA master");
2728                 return -EOPNOTSUPP;
2729         }
2730
2731         netdev_for_each_upper_dev_rcu(master, upper, iter) {
2732                 if (dsa_slave_dev_check(upper))
2733                         continue;
2734                 if (netif_is_bridge_master(upper))
2735                         continue;
2736                 NL_SET_ERR_MSG_MOD(extack, "Cannot join master with unknown uppers");
2737                 return -EOPNOTSUPP;
2738         }
2739
2740         /* Since we allow live-changing the DSA master, plus we auto-open the
2741          * DSA master when the user port opens => we need to ensure that the
2742          * new DSA master is open too.
2743          */
2744         if (dev->flags & IFF_UP) {
2745                 err = dev_open(master, extack);
2746                 if (err)
2747                         return err;
2748         }
2749
2750         netdev_upper_dev_unlink(old_master, dev);
2751
2752         err = netdev_upper_dev_link(master, dev, extack);
2753         if (err)
2754                 goto out_revert_old_master_unlink;
2755
2756         err = dsa_port_change_master(dp, master, extack);
2757         if (err)
2758                 goto out_revert_master_link;
2759
2760         /* Update the MTU of the new CPU port through cross-chip notifiers */
2761         err = dsa_slave_change_mtu(dev, dev->mtu);
2762         if (err && err != -EOPNOTSUPP) {
2763                 netdev_warn(dev,
2764                             "nonfatal error updating MTU with new master: %pe\n",
2765                             ERR_PTR(err));
2766         }
2767
2768         /* If the port doesn't have its own MAC address and relies on the DSA
2769          * master's one, inherit it again from the new DSA master.
2770          */
2771         if (is_zero_ether_addr(dp->mac))
2772                 eth_hw_addr_inherit(dev, master);
2773
2774         return 0;
2775
2776 out_revert_master_link:
2777         netdev_upper_dev_unlink(master, dev);
2778 out_revert_old_master_unlink:
2779         netdev_upper_dev_link(old_master, dev, NULL);
2780         return err;
2781 }
2782
2783 bool dsa_slave_dev_check(const struct net_device *dev)
2784 {
2785         return dev->netdev_ops == &dsa_slave_netdev_ops;
2786 }
2787 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
2788
2789 static int dsa_slave_changeupper(struct net_device *dev,
2790                                  struct netdev_notifier_changeupper_info *info)
2791 {
2792         struct dsa_port *dp = dsa_slave_to_port(dev);
2793         struct netlink_ext_ack *extack;
2794         int err = NOTIFY_DONE;
2795
2796         if (!dsa_slave_dev_check(dev))
2797                 return err;
2798
2799         extack = netdev_notifier_info_to_extack(&info->info);
2800
2801         if (netif_is_bridge_master(info->upper_dev)) {
2802                 if (info->linking) {
2803                         err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2804                         if (!err)
2805                                 dsa_bridge_mtu_normalization(dp);
2806                         if (err == -EOPNOTSUPP) {
2807                                 NL_SET_ERR_MSG_WEAK_MOD(extack,
2808                                                         "Offloading not supported");
2809                                 err = 0;
2810                         }
2811                         err = notifier_from_errno(err);
2812                 } else {
2813                         dsa_port_bridge_leave(dp, info->upper_dev);
2814                         err = NOTIFY_OK;
2815                 }
2816         } else if (netif_is_lag_master(info->upper_dev)) {
2817                 if (info->linking) {
2818                         err = dsa_port_lag_join(dp, info->upper_dev,
2819                                                 info->upper_info, extack);
2820                         if (err == -EOPNOTSUPP) {
2821                                 NL_SET_ERR_MSG_WEAK_MOD(extack,
2822                                                         "Offloading not supported");
2823                                 err = 0;
2824                         }
2825                         err = notifier_from_errno(err);
2826                 } else {
2827                         dsa_port_lag_leave(dp, info->upper_dev);
2828                         err = NOTIFY_OK;
2829                 }
2830         } else if (is_hsr_master(info->upper_dev)) {
2831                 if (info->linking) {
2832                         err = dsa_port_hsr_join(dp, info->upper_dev);
2833                         if (err == -EOPNOTSUPP) {
2834                                 NL_SET_ERR_MSG_WEAK_MOD(extack,
2835                                                         "Offloading not supported");
2836                                 err = 0;
2837                         }
2838                         err = notifier_from_errno(err);
2839                 } else {
2840                         dsa_port_hsr_leave(dp, info->upper_dev);
2841                         err = NOTIFY_OK;
2842                 }
2843         }
2844
2845         return err;
2846 }
2847
2848 static int dsa_slave_prechangeupper(struct net_device *dev,
2849                                     struct netdev_notifier_changeupper_info *info)
2850 {
2851         struct dsa_port *dp = dsa_slave_to_port(dev);
2852
2853         if (!dsa_slave_dev_check(dev))
2854                 return NOTIFY_DONE;
2855
2856         if (netif_is_bridge_master(info->upper_dev) && !info->linking)
2857                 dsa_port_pre_bridge_leave(dp, info->upper_dev);
2858         else if (netif_is_lag_master(info->upper_dev) && !info->linking)
2859                 dsa_port_pre_lag_leave(dp, info->upper_dev);
2860         /* dsa_port_pre_hsr_leave is not yet necessary since hsr cannot be
2861          * meaningfully enslaved to a bridge yet
2862          */
2863
2864         return NOTIFY_DONE;
2865 }
2866
2867 static int
2868 dsa_slave_lag_changeupper(struct net_device *dev,
2869                           struct netdev_notifier_changeupper_info *info)
2870 {
2871         struct net_device *lower;
2872         struct list_head *iter;
2873         int err = NOTIFY_DONE;
2874         struct dsa_port *dp;
2875
2876         if (!netif_is_lag_master(dev))
2877                 return err;
2878
2879         netdev_for_each_lower_dev(dev, lower, iter) {
2880                 if (!dsa_slave_dev_check(lower))
2881                         continue;
2882
2883                 dp = dsa_slave_to_port(lower);
2884                 if (!dp->lag)
2885                         /* Software LAG */
2886                         continue;
2887
2888                 err = dsa_slave_changeupper(lower, info);
2889                 if (notifier_to_errno(err))
2890                         break;
2891         }
2892
2893         return err;
2894 }
2895
2896 /* Same as dsa_slave_lag_changeupper() except that it calls
2897  * dsa_slave_prechangeupper()
2898  */
2899 static int
2900 dsa_slave_lag_prechangeupper(struct net_device *dev,
2901                              struct netdev_notifier_changeupper_info *info)
2902 {
2903         struct net_device *lower;
2904         struct list_head *iter;
2905         int err = NOTIFY_DONE;
2906         struct dsa_port *dp;
2907
2908         if (!netif_is_lag_master(dev))
2909                 return err;
2910
2911         netdev_for_each_lower_dev(dev, lower, iter) {
2912                 if (!dsa_slave_dev_check(lower))
2913                         continue;
2914
2915                 dp = dsa_slave_to_port(lower);
2916                 if (!dp->lag)
2917                         /* Software LAG */
2918                         continue;
2919
2920                 err = dsa_slave_prechangeupper(lower, info);
2921                 if (notifier_to_errno(err))
2922                         break;
2923         }
2924
2925         return err;
2926 }
2927
2928 static int
2929 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2930                                  struct netdev_notifier_changeupper_info *info)
2931 {
2932         struct netlink_ext_ack *ext_ack;
2933         struct net_device *slave, *br;
2934         struct dsa_port *dp;
2935
2936         ext_ack = netdev_notifier_info_to_extack(&info->info);
2937
2938         if (!is_vlan_dev(dev))
2939                 return NOTIFY_DONE;
2940
2941         slave = vlan_dev_real_dev(dev);
2942         if (!dsa_slave_dev_check(slave))
2943                 return NOTIFY_DONE;
2944
2945         dp = dsa_slave_to_port(slave);
2946         br = dsa_port_bridge_dev_get(dp);
2947         if (!br)
2948                 return NOTIFY_DONE;
2949
2950         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2951         if (br_vlan_enabled(br) &&
2952             netif_is_bridge_master(info->upper_dev) && info->linking) {
2953                 NL_SET_ERR_MSG_MOD(ext_ack,
2954                                    "Cannot enslave VLAN device into VLAN aware bridge");
2955                 return notifier_from_errno(-EINVAL);
2956         }
2957
2958         return NOTIFY_DONE;
2959 }
2960
2961 static int
2962 dsa_slave_check_8021q_upper(struct net_device *dev,
2963                             struct netdev_notifier_changeupper_info *info)
2964 {
2965         struct dsa_port *dp = dsa_slave_to_port(dev);
2966         struct net_device *br = dsa_port_bridge_dev_get(dp);
2967         struct bridge_vlan_info br_info;
2968         struct netlink_ext_ack *extack;
2969         int err = NOTIFY_DONE;
2970         u16 vid;
2971
2972         if (!br || !br_vlan_enabled(br))
2973                 return NOTIFY_DONE;
2974
2975         extack = netdev_notifier_info_to_extack(&info->info);
2976         vid = vlan_dev_vlan_id(info->upper_dev);
2977
2978         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2979          * device, respectively the VID is not found, returning
2980          * 0 means success, which is a failure for us here.
2981          */
2982         err = br_vlan_get_info(br, vid, &br_info);
2983         if (err == 0) {
2984                 NL_SET_ERR_MSG_MOD(extack,
2985                                    "This VLAN is already configured by the bridge");
2986                 return notifier_from_errno(-EBUSY);
2987         }
2988
2989         return NOTIFY_DONE;
2990 }
2991
2992 static int
2993 dsa_slave_prechangeupper_sanity_check(struct net_device *dev,
2994                                       struct netdev_notifier_changeupper_info *info)
2995 {
2996         struct dsa_switch *ds;
2997         struct dsa_port *dp;
2998         int err;
2999
3000         if (!dsa_slave_dev_check(dev))
3001                 return dsa_prevent_bridging_8021q_upper(dev, info);
3002
3003         dp = dsa_slave_to_port(dev);
3004         ds = dp->ds;
3005
3006         if (ds->ops->port_prechangeupper) {
3007                 err = ds->ops->port_prechangeupper(ds, dp->index, info);
3008                 if (err)
3009                         return notifier_from_errno(err);
3010         }
3011
3012         if (is_vlan_dev(info->upper_dev))
3013                 return dsa_slave_check_8021q_upper(dev, info);
3014
3015         return NOTIFY_DONE;
3016 }
3017
3018 /* To be eligible as a DSA master, a LAG must have all lower interfaces be
3019  * eligible DSA masters. Additionally, all LAG slaves must be DSA masters of
3020  * switches in the same switch tree.
3021  */
3022 static int dsa_lag_master_validate(struct net_device *lag_dev,
3023                                    struct netlink_ext_ack *extack)
3024 {
3025         struct net_device *lower1, *lower2;
3026         struct list_head *iter1, *iter2;
3027
3028         netdev_for_each_lower_dev(lag_dev, lower1, iter1) {
3029                 netdev_for_each_lower_dev(lag_dev, lower2, iter2) {
3030                         if (!netdev_uses_dsa(lower1) ||
3031                             !netdev_uses_dsa(lower2)) {
3032                                 NL_SET_ERR_MSG_MOD(extack,
3033                                                    "All LAG ports must be eligible as DSA masters");
3034                                 return notifier_from_errno(-EINVAL);
3035                         }
3036
3037                         if (lower1 == lower2)
3038                                 continue;
3039
3040                         if (!dsa_port_tree_same(lower1->dsa_ptr,
3041                                                 lower2->dsa_ptr)) {
3042                                 NL_SET_ERR_MSG_MOD(extack,
3043                                                    "LAG contains DSA masters of disjoint switch trees");
3044                                 return notifier_from_errno(-EINVAL);
3045                         }
3046                 }
3047         }
3048
3049         return NOTIFY_DONE;
3050 }
3051
3052 static int
3053 dsa_master_prechangeupper_sanity_check(struct net_device *master,
3054                                        struct netdev_notifier_changeupper_info *info)
3055 {
3056         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(&info->info);
3057
3058         if (!netdev_uses_dsa(master))
3059                 return NOTIFY_DONE;
3060
3061         if (!info->linking)
3062                 return NOTIFY_DONE;
3063
3064         /* Allow DSA switch uppers */
3065         if (dsa_slave_dev_check(info->upper_dev))
3066                 return NOTIFY_DONE;
3067
3068         /* Allow bridge uppers of DSA masters, subject to further
3069          * restrictions in dsa_bridge_prechangelower_sanity_check()
3070          */
3071         if (netif_is_bridge_master(info->upper_dev))
3072                 return NOTIFY_DONE;
3073
3074         /* Allow LAG uppers, subject to further restrictions in
3075          * dsa_lag_master_prechangelower_sanity_check()
3076          */
3077         if (netif_is_lag_master(info->upper_dev))
3078                 return dsa_lag_master_validate(info->upper_dev, extack);
3079
3080         NL_SET_ERR_MSG_MOD(extack,
3081                            "DSA master cannot join unknown upper interfaces");
3082         return notifier_from_errno(-EBUSY);
3083 }
3084
3085 static int
3086 dsa_lag_master_prechangelower_sanity_check(struct net_device *dev,
3087                                            struct netdev_notifier_changeupper_info *info)
3088 {
3089         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(&info->info);
3090         struct net_device *lag_dev = info->upper_dev;
3091         struct net_device *lower;
3092         struct list_head *iter;
3093
3094         if (!netdev_uses_dsa(lag_dev) || !netif_is_lag_master(lag_dev))
3095                 return NOTIFY_DONE;
3096
3097         if (!info->linking)
3098                 return NOTIFY_DONE;
3099
3100         if (!netdev_uses_dsa(dev)) {
3101                 NL_SET_ERR_MSG(extack,
3102                                "Only DSA masters can join a LAG DSA master");
3103                 return notifier_from_errno(-EINVAL);
3104         }
3105
3106         netdev_for_each_lower_dev(lag_dev, lower, iter) {
3107                 if (!dsa_port_tree_same(dev->dsa_ptr, lower->dsa_ptr)) {
3108                         NL_SET_ERR_MSG(extack,
3109                                        "Interface is DSA master for a different switch tree than this LAG");
3110                         return notifier_from_errno(-EINVAL);
3111                 }
3112
3113                 break;
3114         }
3115
3116         return NOTIFY_DONE;
3117 }
3118
3119 /* Don't allow bridging of DSA masters, since the bridge layer rx_handler
3120  * prevents the DSA fake ethertype handler to be invoked, so we don't get the
3121  * chance to strip off and parse the DSA switch tag protocol header (the bridge
3122  * layer just returns RX_HANDLER_CONSUMED, stopping RX processing for these
3123  * frames).
3124  * The only case where that would not be an issue is when bridging can already
3125  * be offloaded, such as when the DSA master is itself a DSA or plain switchdev
3126  * port, and is bridged only with other ports from the same hardware device.
3127  */
3128 static int
3129 dsa_bridge_prechangelower_sanity_check(struct net_device *new_lower,
3130                                        struct netdev_notifier_changeupper_info *info)
3131 {
3132         struct net_device *br = info->upper_dev;
3133         struct netlink_ext_ack *extack;
3134         struct net_device *lower;
3135         struct list_head *iter;
3136
3137         if (!netif_is_bridge_master(br))
3138                 return NOTIFY_DONE;
3139
3140         if (!info->linking)
3141                 return NOTIFY_DONE;
3142
3143         extack = netdev_notifier_info_to_extack(&info->info);
3144
3145         netdev_for_each_lower_dev(br, lower, iter) {
3146                 if (!netdev_uses_dsa(new_lower) && !netdev_uses_dsa(lower))
3147                         continue;
3148
3149                 if (!netdev_port_same_parent_id(lower, new_lower)) {
3150                         NL_SET_ERR_MSG(extack,
3151                                        "Cannot do software bridging with a DSA master");
3152                         return notifier_from_errno(-EINVAL);
3153                 }
3154         }
3155
3156         return NOTIFY_DONE;
3157 }
3158
3159 static void dsa_tree_migrate_ports_from_lag_master(struct dsa_switch_tree *dst,
3160                                                    struct net_device *lag_dev)
3161 {
3162         struct net_device *new_master = dsa_tree_find_first_master(dst);
3163         struct dsa_port *dp;
3164         int err;
3165
3166         dsa_tree_for_each_user_port(dp, dst) {
3167                 if (dsa_port_to_master(dp) != lag_dev)
3168                         continue;
3169
3170                 err = dsa_slave_change_master(dp->slave, new_master, NULL);
3171                 if (err) {
3172                         netdev_err(dp->slave,
3173                                    "failed to restore master to %s: %pe\n",
3174                                    new_master->name, ERR_PTR(err));
3175                 }
3176         }
3177 }
3178
3179 static int dsa_master_lag_join(struct net_device *master,
3180                                struct net_device *lag_dev,
3181                                struct netdev_lag_upper_info *uinfo,
3182                                struct netlink_ext_ack *extack)
3183 {
3184         struct dsa_port *cpu_dp = master->dsa_ptr;
3185         struct dsa_switch_tree *dst = cpu_dp->dst;
3186         struct dsa_port *dp;
3187         int err;
3188
3189         err = dsa_master_lag_setup(lag_dev, cpu_dp, uinfo, extack);
3190         if (err)
3191                 return err;
3192
3193         dsa_tree_for_each_user_port(dp, dst) {
3194                 if (dsa_port_to_master(dp) != master)
3195                         continue;
3196
3197                 err = dsa_slave_change_master(dp->slave, lag_dev, extack);
3198                 if (err)
3199                         goto restore;
3200         }
3201
3202         return 0;
3203
3204 restore:
3205         dsa_tree_for_each_user_port_continue_reverse(dp, dst) {
3206                 if (dsa_port_to_master(dp) != lag_dev)
3207                         continue;
3208
3209                 err = dsa_slave_change_master(dp->slave, master, NULL);
3210                 if (err) {
3211                         netdev_err(dp->slave,
3212                                    "failed to restore master to %s: %pe\n",
3213                                    master->name, ERR_PTR(err));
3214                 }
3215         }
3216
3217         dsa_master_lag_teardown(lag_dev, master->dsa_ptr);
3218
3219         return err;
3220 }
3221
3222 static void dsa_master_lag_leave(struct net_device *master,
3223                                  struct net_device *lag_dev)
3224 {
3225         struct dsa_port *dp, *cpu_dp = lag_dev->dsa_ptr;
3226         struct dsa_switch_tree *dst = cpu_dp->dst;
3227         struct dsa_port *new_cpu_dp = NULL;
3228         struct net_device *lower;
3229         struct list_head *iter;
3230
3231         netdev_for_each_lower_dev(lag_dev, lower, iter) {
3232                 if (netdev_uses_dsa(lower)) {
3233                         new_cpu_dp = lower->dsa_ptr;
3234                         break;
3235                 }
3236         }
3237
3238         if (new_cpu_dp) {
3239                 /* Update the CPU port of the user ports still under the LAG
3240                  * so that dsa_port_to_master() continues to work properly
3241                  */
3242                 dsa_tree_for_each_user_port(dp, dst)
3243                         if (dsa_port_to_master(dp) == lag_dev)
3244                                 dp->cpu_dp = new_cpu_dp;
3245
3246                 /* Update the index of the virtual CPU port to match the lowest
3247                  * physical CPU port
3248                  */
3249                 lag_dev->dsa_ptr = new_cpu_dp;
3250                 wmb();
3251         } else {
3252                 /* If the LAG DSA master has no ports left, migrate back all
3253                  * user ports to the first physical CPU port
3254                  */
3255                 dsa_tree_migrate_ports_from_lag_master(dst, lag_dev);
3256         }
3257
3258         /* This DSA master has left its LAG in any case, so let
3259          * the CPU port leave the hardware LAG as well
3260          */
3261         dsa_master_lag_teardown(lag_dev, master->dsa_ptr);
3262 }
3263
3264 static int dsa_master_changeupper(struct net_device *dev,
3265                                   struct netdev_notifier_changeupper_info *info)
3266 {
3267         struct netlink_ext_ack *extack;
3268         int err = NOTIFY_DONE;
3269
3270         if (!netdev_uses_dsa(dev))
3271                 return err;
3272
3273         extack = netdev_notifier_info_to_extack(&info->info);
3274
3275         if (netif_is_lag_master(info->upper_dev)) {
3276                 if (info->linking) {
3277                         err = dsa_master_lag_join(dev, info->upper_dev,
3278                                                   info->upper_info, extack);
3279                         err = notifier_from_errno(err);
3280                 } else {
3281                         dsa_master_lag_leave(dev, info->upper_dev);
3282                         err = NOTIFY_OK;
3283                 }
3284         }
3285
3286         return err;
3287 }
3288
3289 static int dsa_slave_netdevice_event(struct notifier_block *nb,
3290                                      unsigned long event, void *ptr)
3291 {
3292         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3293
3294         switch (event) {
3295         case NETDEV_PRECHANGEUPPER: {
3296                 struct netdev_notifier_changeupper_info *info = ptr;
3297                 int err;
3298
3299                 err = dsa_slave_prechangeupper_sanity_check(dev, info);
3300                 if (notifier_to_errno(err))
3301                         return err;
3302
3303                 err = dsa_master_prechangeupper_sanity_check(dev, info);
3304                 if (notifier_to_errno(err))
3305                         return err;
3306
3307                 err = dsa_lag_master_prechangelower_sanity_check(dev, info);
3308                 if (notifier_to_errno(err))
3309                         return err;
3310
3311                 err = dsa_bridge_prechangelower_sanity_check(dev, info);
3312                 if (notifier_to_errno(err))
3313                         return err;
3314
3315                 err = dsa_slave_prechangeupper(dev, ptr);
3316                 if (notifier_to_errno(err))
3317                         return err;
3318
3319                 err = dsa_slave_lag_prechangeupper(dev, ptr);
3320                 if (notifier_to_errno(err))
3321                         return err;
3322
3323                 break;
3324         }
3325         case NETDEV_CHANGEUPPER: {
3326                 int err;
3327
3328                 err = dsa_slave_changeupper(dev, ptr);
3329                 if (notifier_to_errno(err))
3330                         return err;
3331
3332                 err = dsa_slave_lag_changeupper(dev, ptr);
3333                 if (notifier_to_errno(err))
3334                         return err;
3335
3336                 err = dsa_master_changeupper(dev, ptr);
3337                 if (notifier_to_errno(err))
3338                         return err;
3339
3340                 break;
3341         }
3342         case NETDEV_CHANGELOWERSTATE: {
3343                 struct netdev_notifier_changelowerstate_info *info = ptr;
3344                 struct dsa_port *dp;
3345                 int err = 0;
3346
3347                 if (dsa_slave_dev_check(dev)) {
3348                         dp = dsa_slave_to_port(dev);
3349
3350                         err = dsa_port_lag_change(dp, info->lower_state_info);
3351                 }
3352
3353                 /* Mirror LAG port events on DSA masters that are in
3354                  * a LAG towards their respective switch CPU ports
3355                  */
3356                 if (netdev_uses_dsa(dev)) {
3357                         dp = dev->dsa_ptr;
3358
3359                         err = dsa_port_lag_change(dp, info->lower_state_info);
3360                 }
3361
3362                 return notifier_from_errno(err);
3363         }
3364         case NETDEV_CHANGE:
3365         case NETDEV_UP: {
3366                 /* Track state of master port.
3367                  * DSA driver may require the master port (and indirectly
3368                  * the tagger) to be available for some special operation.
3369                  */
3370                 if (netdev_uses_dsa(dev)) {
3371                         struct dsa_port *cpu_dp = dev->dsa_ptr;
3372                         struct dsa_switch_tree *dst = cpu_dp->ds->dst;
3373
3374                         /* Track when the master port is UP */
3375                         dsa_tree_master_oper_state_change(dst, dev,
3376                                                           netif_oper_up(dev));
3377
3378                         /* Track when the master port is ready and can accept
3379                          * packet.
3380                          * NETDEV_UP event is not enough to flag a port as ready.
3381                          * We also have to wait for linkwatch_do_dev to dev_activate
3382                          * and emit a NETDEV_CHANGE event.
3383                          * We check if a master port is ready by checking if the dev
3384                          * have a qdisc assigned and is not noop.
3385                          */
3386                         dsa_tree_master_admin_state_change(dst, dev,
3387                                                            !qdisc_tx_is_noop(dev));
3388
3389                         return NOTIFY_OK;
3390                 }
3391
3392                 return NOTIFY_DONE;
3393         }
3394         case NETDEV_GOING_DOWN: {
3395                 struct dsa_port *dp, *cpu_dp;
3396                 struct dsa_switch_tree *dst;
3397                 LIST_HEAD(close_list);
3398
3399                 if (!netdev_uses_dsa(dev))
3400                         return NOTIFY_DONE;
3401
3402                 cpu_dp = dev->dsa_ptr;
3403                 dst = cpu_dp->ds->dst;
3404
3405                 dsa_tree_master_admin_state_change(dst, dev, false);
3406
3407                 list_for_each_entry(dp, &dst->ports, list) {
3408                         if (!dsa_port_is_user(dp))
3409                                 continue;
3410
3411                         if (dp->cpu_dp != cpu_dp)
3412                                 continue;
3413
3414                         list_add(&dp->slave->close_list, &close_list);
3415                 }
3416
3417                 dev_close_many(&close_list, true);
3418
3419                 return NOTIFY_OK;
3420         }
3421         default:
3422                 break;
3423         }
3424
3425         return NOTIFY_DONE;
3426 }
3427
3428 static void
3429 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
3430 {
3431         struct switchdev_notifier_fdb_info info = {};
3432
3433         info.addr = switchdev_work->addr;
3434         info.vid = switchdev_work->vid;
3435         info.offloaded = true;
3436         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
3437                                  switchdev_work->orig_dev, &info.info, NULL);
3438 }
3439
3440 static void dsa_slave_switchdev_event_work(struct work_struct *work)
3441 {
3442         struct dsa_switchdev_event_work *switchdev_work =
3443                 container_of(work, struct dsa_switchdev_event_work, work);
3444         const unsigned char *addr = switchdev_work->addr;
3445         struct net_device *dev = switchdev_work->dev;
3446         u16 vid = switchdev_work->vid;
3447         struct dsa_switch *ds;
3448         struct dsa_port *dp;
3449         int err;
3450
3451         dp = dsa_slave_to_port(dev);
3452         ds = dp->ds;
3453
3454         switch (switchdev_work->event) {
3455         case SWITCHDEV_FDB_ADD_TO_DEVICE:
3456                 if (switchdev_work->host_addr)
3457                         err = dsa_port_bridge_host_fdb_add(dp, addr, vid);
3458                 else if (dp->lag)
3459                         err = dsa_port_lag_fdb_add(dp, addr, vid);
3460                 else
3461                         err = dsa_port_fdb_add(dp, addr, vid);
3462                 if (err) {
3463                         dev_err(ds->dev,
3464                                 "port %d failed to add %pM vid %d to fdb: %d\n",
3465                                 dp->index, addr, vid, err);
3466                         break;
3467                 }
3468                 dsa_fdb_offload_notify(switchdev_work);
3469                 break;
3470
3471         case SWITCHDEV_FDB_DEL_TO_DEVICE:
3472                 if (switchdev_work->host_addr)
3473                         err = dsa_port_bridge_host_fdb_del(dp, addr, vid);
3474                 else if (dp->lag)
3475                         err = dsa_port_lag_fdb_del(dp, addr, vid);
3476                 else
3477                         err = dsa_port_fdb_del(dp, addr, vid);
3478                 if (err) {
3479                         dev_err(ds->dev,
3480                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
3481                                 dp->index, addr, vid, err);
3482                 }
3483
3484                 break;
3485         }
3486
3487         kfree(switchdev_work);
3488 }
3489
3490 static bool dsa_foreign_dev_check(const struct net_device *dev,
3491                                   const struct net_device *foreign_dev)
3492 {
3493         const struct dsa_port *dp = dsa_slave_to_port(dev);
3494         struct dsa_switch_tree *dst = dp->ds->dst;
3495
3496         if (netif_is_bridge_master(foreign_dev))
3497                 return !dsa_tree_offloads_bridge_dev(dst, foreign_dev);
3498
3499         if (netif_is_bridge_port(foreign_dev))
3500                 return !dsa_tree_offloads_bridge_port(dst, foreign_dev);
3501
3502         /* Everything else is foreign */
3503         return true;
3504 }
3505
3506 static int dsa_slave_fdb_event(struct net_device *dev,
3507                                struct net_device *orig_dev,
3508                                unsigned long event, const void *ctx,
3509                                const struct switchdev_notifier_fdb_info *fdb_info)
3510 {
3511         struct dsa_switchdev_event_work *switchdev_work;
3512         struct dsa_port *dp = dsa_slave_to_port(dev);
3513         bool host_addr = fdb_info->is_local;
3514         struct dsa_switch *ds = dp->ds;
3515
3516         if (ctx && ctx != dp)
3517                 return 0;
3518
3519         if (!dp->bridge)
3520                 return 0;
3521
3522         if (switchdev_fdb_is_dynamically_learned(fdb_info)) {
3523                 if (dsa_port_offloads_bridge_port(dp, orig_dev))
3524                         return 0;
3525
3526                 /* FDB entries learned by the software bridge or by foreign
3527                  * bridge ports should be installed as host addresses only if
3528                  * the driver requests assisted learning.
3529                  */
3530                 if (!ds->assisted_learning_on_cpu_port)
3531                         return 0;
3532         }
3533
3534         /* Also treat FDB entries on foreign interfaces bridged with us as host
3535          * addresses.
3536          */
3537         if (dsa_foreign_dev_check(dev, orig_dev))
3538                 host_addr = true;
3539
3540         /* Check early that we're not doing work in vain.
3541          * Host addresses on LAG ports still require regular FDB ops,
3542          * since the CPU port isn't in a LAG.
3543          */
3544         if (dp->lag && !host_addr) {
3545                 if (!ds->ops->lag_fdb_add || !ds->ops->lag_fdb_del)
3546                         return -EOPNOTSUPP;
3547         } else {
3548                 if (!ds->ops->port_fdb_add || !ds->ops->port_fdb_del)
3549                         return -EOPNOTSUPP;
3550         }
3551
3552         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
3553         if (!switchdev_work)
3554                 return -ENOMEM;
3555
3556         netdev_dbg(dev, "%s FDB entry towards %s, addr %pM vid %d%s\n",
3557                    event == SWITCHDEV_FDB_ADD_TO_DEVICE ? "Adding" : "Deleting",
3558                    orig_dev->name, fdb_info->addr, fdb_info->vid,
3559                    host_addr ? " as host address" : "");
3560
3561         INIT_WORK(&switchdev_work->work, dsa_slave_switchdev_event_work);
3562         switchdev_work->event = event;
3563         switchdev_work->dev = dev;
3564         switchdev_work->orig_dev = orig_dev;
3565
3566         ether_addr_copy(switchdev_work->addr, fdb_info->addr);
3567         switchdev_work->vid = fdb_info->vid;
3568         switchdev_work->host_addr = host_addr;
3569
3570         dsa_schedule_work(&switchdev_work->work);
3571
3572         return 0;
3573 }
3574
3575 /* Called under rcu_read_lock() */
3576 static int dsa_slave_switchdev_event(struct notifier_block *unused,
3577                                      unsigned long event, void *ptr)
3578 {
3579         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3580         int err;
3581
3582         switch (event) {
3583         case SWITCHDEV_PORT_ATTR_SET:
3584                 err = switchdev_handle_port_attr_set(dev, ptr,
3585                                                      dsa_slave_dev_check,
3586                                                      dsa_slave_port_attr_set);
3587                 return notifier_from_errno(err);
3588         case SWITCHDEV_FDB_ADD_TO_DEVICE:
3589         case SWITCHDEV_FDB_DEL_TO_DEVICE:
3590                 err = switchdev_handle_fdb_event_to_device(dev, event, ptr,
3591                                                            dsa_slave_dev_check,
3592                                                            dsa_foreign_dev_check,
3593                                                            dsa_slave_fdb_event);
3594                 return notifier_from_errno(err);
3595         default:
3596                 return NOTIFY_DONE;
3597         }
3598
3599         return NOTIFY_OK;
3600 }
3601
3602 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
3603                                               unsigned long event, void *ptr)
3604 {
3605         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3606         int err;
3607
3608         switch (event) {
3609         case SWITCHDEV_PORT_OBJ_ADD:
3610                 err = switchdev_handle_port_obj_add_foreign(dev, ptr,
3611                                                             dsa_slave_dev_check,
3612                                                             dsa_foreign_dev_check,
3613                                                             dsa_slave_port_obj_add);
3614                 return notifier_from_errno(err);
3615         case SWITCHDEV_PORT_OBJ_DEL:
3616                 err = switchdev_handle_port_obj_del_foreign(dev, ptr,
3617                                                             dsa_slave_dev_check,
3618                                                             dsa_foreign_dev_check,
3619                                                             dsa_slave_port_obj_del);
3620                 return notifier_from_errno(err);
3621         case SWITCHDEV_PORT_ATTR_SET:
3622                 err = switchdev_handle_port_attr_set(dev, ptr,
3623                                                      dsa_slave_dev_check,
3624                                                      dsa_slave_port_attr_set);
3625                 return notifier_from_errno(err);
3626         }
3627
3628         return NOTIFY_DONE;
3629 }
3630
3631 static struct notifier_block dsa_slave_nb __read_mostly = {
3632         .notifier_call  = dsa_slave_netdevice_event,
3633 };
3634
3635 struct notifier_block dsa_slave_switchdev_notifier = {
3636         .notifier_call = dsa_slave_switchdev_event,
3637 };
3638
3639 struct notifier_block dsa_slave_switchdev_blocking_notifier = {
3640         .notifier_call = dsa_slave_switchdev_blocking_event,
3641 };
3642
3643 int dsa_slave_register_notifier(void)
3644 {
3645         struct notifier_block *nb;
3646         int err;
3647
3648         err = register_netdevice_notifier(&dsa_slave_nb);
3649         if (err)
3650                 return err;
3651
3652         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
3653         if (err)
3654                 goto err_switchdev_nb;
3655
3656         nb = &dsa_slave_switchdev_blocking_notifier;
3657         err = register_switchdev_blocking_notifier(nb);
3658         if (err)
3659                 goto err_switchdev_blocking_nb;
3660
3661         return 0;
3662
3663 err_switchdev_blocking_nb:
3664         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
3665 err_switchdev_nb:
3666         unregister_netdevice_notifier(&dsa_slave_nb);
3667         return err;
3668 }
3669
3670 void dsa_slave_unregister_notifier(void)
3671 {
3672         struct notifier_block *nb;
3673         int err;
3674
3675         nb = &dsa_slave_switchdev_blocking_notifier;
3676         err = unregister_switchdev_blocking_notifier(nb);
3677         if (err)
3678                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
3679
3680         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
3681         if (err)
3682                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
3683
3684         err = unregister_netdevice_notifier(&dsa_slave_nb);
3685         if (err)
3686                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
3687 }