net/dsa/slave.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/dsa/slave.c - Slave device handling
   4  * Copyright (c) 2008-2009 Marvell Semiconductor
   5  */
   6
   7 #include <linux/list.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/phy.h>
  11 #include <linux/phy_fixed.h>
  12 #include <linux/phylink.h>
  13 #include <linux/of_net.h>
  14 #include <linux/of_mdio.h>
  15 #include <linux/mdio.h>
  16 #include <net/rtnetlink.h>
  17 #include <net/pkt_cls.h>
  18 #include <net/selftests.h>
  19 #include <net/tc_act/tc_mirred.h>
  20 #include <linux/if_bridge.h>
  21 #include <linux/if_hsr.h>
  22 #include <net/dcbnl.h>
  23 #include <linux/netpoll.h>
  24
  25 #include "dsa_priv.h"
  26
  27 static void dsa_slave_standalone_event_work(struct work_struct *work)
  28 {
  29         struct dsa_standalone_event_work *standalone_work =
  30                 container_of(work, struct dsa_standalone_event_work, work);
  31         const unsigned char *addr = standalone_work->addr;
  32         struct net_device *dev = standalone_work->dev;
  33         struct dsa_port *dp = dsa_slave_to_port(dev);
  34         struct switchdev_obj_port_mdb mdb;
  35         struct dsa_switch *ds = dp->ds;
  36         u16 vid = standalone_work->vid;
  37         int err;
  38
  39         switch (standalone_work->event) {
  40         case DSA_UC_ADD:
  41                 err = dsa_port_standalone_host_fdb_add(dp, addr, vid);
  42                 if (err) {
  43                         dev_err(ds->dev,
  44                                 "port %d failed to add %pM vid %d to fdb: %d\n",
  45                                 dp->index, addr, vid, err);
  46                         break;
  47                 }
  48                 break;
  49
  50         case DSA_UC_DEL:
  51                 err = dsa_port_standalone_host_fdb_del(dp, addr, vid);
  52                 if (err) {
  53                         dev_err(ds->dev,
  54                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
  55                                 dp->index, addr, vid, err);
  56                 }
  57
  58                 break;
  59         case DSA_MC_ADD:
  60                 ether_addr_copy(mdb.addr, addr);
  61                 mdb.vid = vid;
  62
  63                 err = dsa_port_standalone_host_mdb_add(dp, &mdb);
  64                 if (err) {
  65                         dev_err(ds->dev,
  66                                 "port %d failed to add %pM vid %d to mdb: %d\n",
  67                                 dp->index, addr, vid, err);
  68                         break;
  69                 }
  70                 break;
  71         case DSA_MC_DEL:
  72                 ether_addr_copy(mdb.addr, addr);
  73                 mdb.vid = vid;
  74
  75                 err = dsa_port_standalone_host_mdb_del(dp, &mdb);
  76                 if (err) {
  77                         dev_err(ds->dev,
  78                                 "port %d failed to delete %pM vid %d from mdb: %d\n",
  79                                 dp->index, addr, vid, err);
  80                 }
  81
  82                 break;
  83         }
  84
  85         kfree(standalone_work);
  86 }
  87
  88 static int dsa_slave_schedule_standalone_work(struct net_device *dev,
  89                                               enum dsa_standalone_event event,
  90                                               const unsigned char *addr,
  91                                               u16 vid)
  92 {
  93         struct dsa_standalone_event_work *standalone_work;
  94
  95         standalone_work = kzalloc(sizeof(*standalone_work), GFP_ATOMIC);
  96         if (!standalone_work)
  97                 return -ENOMEM;
  98
  99         INIT_WORK(&standalone_work->work, dsa_slave_standalone_event_work);
 100         standalone_work->event = event;
 101         standalone_work->dev = dev;
 102
 103         ether_addr_copy(standalone_work->addr, addr);
 104         standalone_work->vid = vid;
 105
 106         dsa_schedule_work(&standalone_work->work);
 107
 108         return 0;
 109 }
 110
 111 static int dsa_slave_sync_uc(struct net_device *dev,
 112                              const unsigned char *addr)
 113 {
 114         struct net_device *master = dsa_slave_to_master(dev);
 115         struct dsa_port *dp = dsa_slave_to_port(dev);
 116
 117         dev_uc_add(master, addr);
 118
 119         if (!dsa_switch_supports_uc_filtering(dp->ds))
 120                 return 0;
 121
 122         return dsa_slave_schedule_standalone_work(dev, DSA_UC_ADD, addr, 0);
 123 }
 124
 125 static int dsa_slave_unsync_uc(struct net_device *dev,
 126                                const unsigned char *addr)
 127 {
 128         struct net_device *master = dsa_slave_to_master(dev);
 129         struct dsa_port *dp = dsa_slave_to_port(dev);
 130
 131         dev_uc_del(master, addr);
 132
 133         if (!dsa_switch_supports_uc_filtering(dp->ds))
 134                 return 0;
 135
 136         return dsa_slave_schedule_standalone_work(dev, DSA_UC_DEL, addr, 0);
 137 }
 138
 139 static int dsa_slave_sync_mc(struct net_device *dev,
 140                              const unsigned char *addr)
 141 {
 142         struct net_device *master = dsa_slave_to_master(dev);
 143         struct dsa_port *dp = dsa_slave_to_port(dev);
 144
 145         dev_mc_add(master, addr);
 146
 147         if (!dsa_switch_supports_mc_filtering(dp->ds))
 148                 return 0;
 149
 150         return dsa_slave_schedule_standalone_work(dev, DSA_MC_ADD, addr, 0);
 151 }
 152
 153 static int dsa_slave_unsync_mc(struct net_device *dev,
 154                                const unsigned char *addr)
 155 {
 156         struct net_device *master = dsa_slave_to_master(dev);
 157         struct dsa_port *dp = dsa_slave_to_port(dev);
 158
 159         dev_mc_del(master, addr);
 160
 161         if (!dsa_switch_supports_mc_filtering(dp->ds))
 162                 return 0;
 163
 164         return dsa_slave_schedule_standalone_work(dev, DSA_MC_DEL, addr, 0);
 165 }
 166
 167 /* slave mii_bus handling ***************************************************/
 168 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
 169 {
 170         struct dsa_switch *ds = bus->priv;
 171
 172         if (ds->phys_mii_mask & (1 << addr))
 173                 return ds->ops->phy_read(ds, addr, reg);
 174
 175         return 0xffff;
 176 }
 177
 178 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
 179 {
 180         struct dsa_switch *ds = bus->priv;
 181
 182         if (ds->phys_mii_mask & (1 << addr))
 183                 return ds->ops->phy_write(ds, addr, reg, val);
 184
 185         return 0;
 186 }
 187
 188 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
 189 {
 190         ds->slave_mii_bus->priv = (void *)ds;
 191         ds->slave_mii_bus->name = "dsa slave smi";
 192         ds->slave_mii_bus->read = dsa_slave_phy_read;
 193         ds->slave_mii_bus->write = dsa_slave_phy_write;
 194         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
 195                  ds->dst->index, ds->index);
 196         ds->slave_mii_bus->parent = ds->dev;
 197         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
 198 }
 199
 200
 201 /* slave device handling ****************************************************/
 202 static int dsa_slave_get_iflink(const struct net_device *dev)
 203 {
 204         return dsa_slave_to_master(dev)->ifindex;
 205 }
 206
 207 static int dsa_slave_open(struct net_device *dev)
 208 {
 209         struct net_device *master = dsa_slave_to_master(dev);
 210         struct dsa_port *dp = dsa_slave_to_port(dev);
 211         struct dsa_switch *ds = dp->ds;
 212         int err;
 213
 214         err = dev_open(master, NULL);
 215         if (err < 0) {
 216                 netdev_err(dev, "failed to open master %s\n", master->name);
 217                 goto out;
 218         }
 219
 220         if (dsa_switch_supports_uc_filtering(ds)) {
 221                 err = dsa_port_standalone_host_fdb_add(dp, dev->dev_addr, 0);
 222                 if (err)
 223                         goto out;
 224         }
 225
 226         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
 227                 err = dev_uc_add(master, dev->dev_addr);
 228                 if (err < 0)
 229                         goto del_host_addr;
 230         }
 231
 232         err = dsa_port_enable_rt(dp, dev->phydev);
 233         if (err)
 234                 goto del_unicast;
 235
 236         return 0;
 237
 238 del_unicast:
 239         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 240                 dev_uc_del(master, dev->dev_addr);
 241 del_host_addr:
 242         if (dsa_switch_supports_uc_filtering(ds))
 243                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 244 out:
 245         return err;
 246 }
 247
 248 static int dsa_slave_close(struct net_device *dev)
 249 {
 250         struct net_device *master = dsa_slave_to_master(dev);
 251         struct dsa_port *dp = dsa_slave_to_port(dev);
 252         struct dsa_switch *ds = dp->ds;
 253
 254         dsa_port_disable_rt(dp);
 255
 256         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 257                 dev_uc_del(master, dev->dev_addr);
 258
 259         if (dsa_switch_supports_uc_filtering(ds))
 260                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 261
 262         return 0;
 263 }
 264
 265 static void dsa_slave_manage_host_flood(struct net_device *dev)
 266 {
 267         bool mc = dev->flags & (IFF_PROMISC | IFF_ALLMULTI);
 268         struct dsa_port *dp = dsa_slave_to_port(dev);
 269         bool uc = dev->flags & IFF_PROMISC;
 270
 271         dsa_port_set_host_flood(dp, uc, mc);
 272 }
 273
 274 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 275 {
 276         struct net_device *master = dsa_slave_to_master(dev);
 277         struct dsa_port *dp = dsa_slave_to_port(dev);
 278         struct dsa_switch *ds = dp->ds;
 279
 280         if (change & IFF_ALLMULTI)
 281                 dev_set_allmulti(master,
 282                                  dev->flags & IFF_ALLMULTI ? 1 : -1);
 283         if (change & IFF_PROMISC)
 284                 dev_set_promiscuity(master,
 285                                     dev->flags & IFF_PROMISC ? 1 : -1);
 286
 287         if (dsa_switch_supports_uc_filtering(ds) &&
 288             dsa_switch_supports_mc_filtering(ds))
 289                 dsa_slave_manage_host_flood(dev);
 290 }
 291
 292 static void dsa_slave_set_rx_mode(struct net_device *dev)
 293 {
 294         __dev_mc_sync(dev, dsa_slave_sync_mc, dsa_slave_unsync_mc);
 295         __dev_uc_sync(dev, dsa_slave_sync_uc, dsa_slave_unsync_uc);
 296 }
 297
 298 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 299 {
 300         struct net_device *master = dsa_slave_to_master(dev);
 301         struct dsa_port *dp = dsa_slave_to_port(dev);
 302         struct dsa_switch *ds = dp->ds;
 303         struct sockaddr *addr = a;
 304         int err;
 305
 306         if (!is_valid_ether_addr(addr->sa_data))
 307                 return -EADDRNOTAVAIL;
 308
 309         /* If the port is down, the address isn't synced yet to hardware or
 310          * to the DSA master, so there is nothing to change.
 311          */
 312         if (!(dev->flags & IFF_UP))
 313                 goto out_change_dev_addr;
 314
 315         if (dsa_switch_supports_uc_filtering(ds)) {
 316                 err = dsa_port_standalone_host_fdb_add(dp, addr->sa_data, 0);
 317                 if (err)
 318                         return err;
 319         }
 320
 321         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 322                 err = dev_uc_add(master, addr->sa_data);
 323                 if (err < 0)
 324                         goto del_unicast;
 325         }
 326
 327         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 328                 dev_uc_del(master, dev->dev_addr);
 329
 330         if (dsa_switch_supports_uc_filtering(ds))
 331                 dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 332
 333 out_change_dev_addr:
 334         eth_hw_addr_set(dev, addr->sa_data);
 335
 336         return 0;
 337
 338 del_unicast:
 339         if (dsa_switch_supports_uc_filtering(ds))
 340                 dsa_port_standalone_host_fdb_del(dp, addr->sa_data, 0);
 341
 342         return err;
 343 }
 344
 345 struct dsa_slave_dump_ctx {
 346         struct net_device *dev;
 347         struct sk_buff *skb;
 348         struct netlink_callback *cb;
 349         int idx;
 350 };
 351
 352 static int
 353 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 354                            bool is_static, void *data)
 355 {
 356         struct dsa_slave_dump_ctx *dump = data;
 357         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 358         u32 seq = dump->cb->nlh->nlmsg_seq;
 359         struct nlmsghdr *nlh;
 360         struct ndmsg *ndm;
 361
 362         if (dump->idx < dump->cb->args[2])
 363                 goto skip;
 364
 365         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 366                         sizeof(*ndm), NLM_F_MULTI);
 367         if (!nlh)
 368                 return -EMSGSIZE;
 369
 370         ndm = nlmsg_data(nlh);
 371         ndm->ndm_family  = AF_BRIDGE;
 372         ndm->ndm_pad1    = 0;
 373         ndm->ndm_pad2    = 0;
 374         ndm->ndm_flags   = NTF_SELF;
 375         ndm->ndm_type    = 0;
 376         ndm->ndm_ifindex = dump->dev->ifindex;
 377         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 378
 379         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 380                 goto nla_put_failure;
 381
 382         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 383                 goto nla_put_failure;
 384
 385         nlmsg_end(dump->skb, nlh);
 386
 387 skip:
 388         dump->idx++;
 389         return 0;
 390
 391 nla_put_failure:
 392         nlmsg_cancel(dump->skb, nlh);
 393         return -EMSGSIZE;
 394 }
 395
 396 static int
 397 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 398                    struct net_device *dev, struct net_device *filter_dev,
 399                    int *idx)
 400 {
 401         struct dsa_port *dp = dsa_slave_to_port(dev);
 402         struct dsa_slave_dump_ctx dump = {
 403                 .dev = dev,
 404                 .skb = skb,
 405                 .cb = cb,
 406                 .idx = *idx,
 407         };
 408         int err;
 409
 410         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 411         *idx = dump.idx;
 412
 413         return err;
 414 }
 415
 416 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 417 {
 418         struct dsa_slave_priv *p = netdev_priv(dev);
 419         struct dsa_switch *ds = p->dp->ds;
 420         int port = p->dp->index;
 421
 422         /* Pass through to switch driver if it supports timestamping */
 423         switch (cmd) {
 424         case SIOCGHWTSTAMP:
 425                 if (ds->ops->port_hwtstamp_get)
 426                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 427                 break;
 428         case SIOCSHWTSTAMP:
 429                 if (ds->ops->port_hwtstamp_set)
 430                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 431                 break;
 432         }
 433
 434         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 435 }
 436
 437 static int dsa_slave_port_attr_set(struct net_device *dev, const void *ctx,
 438                                    const struct switchdev_attr *attr,
 439                                    struct netlink_ext_ack *extack)
 440 {
 441         struct dsa_port *dp = dsa_slave_to_port(dev);
 442         int ret;
 443
 444         if (ctx && ctx != dp)
 445                 return 0;
 446
 447         switch (attr->id) {
 448         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 449                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 450                         return -EOPNOTSUPP;
 451
 452                 ret = dsa_port_set_state(dp, attr->u.stp_state, true);
 453                 break;
 454         case SWITCHDEV_ATTR_ID_PORT_MST_STATE:
 455                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 456                         return -EOPNOTSUPP;
 457
 458                 ret = dsa_port_set_mst_state(dp, &attr->u.mst_state, extack);
 459                 break;
 460         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 461                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 462                         return -EOPNOTSUPP;
 463
 464                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 465                                               extack);
 466                 break;
 467         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 468                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 469                         return -EOPNOTSUPP;
 470
 471                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 472                 break;
 473         case SWITCHDEV_ATTR_ID_BRIDGE_MST:
 474                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 475                         return -EOPNOTSUPP;
 476
 477                 ret = dsa_port_mst_enable(dp, attr->u.mst, extack);
 478                 break;
 479         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 480                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 481                         return -EOPNOTSUPP;
 482
 483                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 484                                                 extack);
 485                 break;
 486         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 487                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 488                         return -EOPNOTSUPP;
 489
 490                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 491                 break;
 492         case SWITCHDEV_ATTR_ID_VLAN_MSTI:
 493                 if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 494                         return -EOPNOTSUPP;
 495
 496                 ret = dsa_port_vlan_msti(dp, &attr->u.vlan_msti);
 497                 break;
 498         default:
 499                 ret = -EOPNOTSUPP;
 500                 break;
 501         }
 502
 503         return ret;
 504 }
 505
 506 /* Must be called under rcu_read_lock() */
 507 static int
 508 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 509                                       const struct switchdev_obj_port_vlan *vlan)
 510 {
 511         struct net_device *upper_dev;
 512         struct list_head *iter;
 513
 514         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 515                 u16 vid;
 516
 517                 if (!is_vlan_dev(upper_dev))
 518                         continue;
 519
 520                 vid = vlan_dev_vlan_id(upper_dev);
 521                 if (vid == vlan->vid)
 522                         return -EBUSY;
 523         }
 524
 525         return 0;
 526 }
 527
 528 static int dsa_slave_vlan_add(struct net_device *dev,
 529                               const struct switchdev_obj *obj,
 530                               struct netlink_ext_ack *extack)
 531 {
 532         struct dsa_port *dp = dsa_slave_to_port(dev);
 533         struct switchdev_obj_port_vlan *vlan;
 534         int err;
 535
 536         if (dsa_port_skip_vlan_configuration(dp)) {
 537                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 538                 return 0;
 539         }
 540
 541         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 542
 543         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 544          * the same VID.
 545          */
 546         if (br_vlan_enabled(dsa_port_bridge_dev_get(dp))) {
 547                 rcu_read_lock();
 548                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, vlan);
 549                 rcu_read_unlock();
 550                 if (err) {
 551                         NL_SET_ERR_MSG_MOD(extack,
 552                                            "Port already has a VLAN upper with this VID");
 553                         return err;
 554                 }
 555         }
 556
 557         return dsa_port_vlan_add(dp, vlan, extack);
 558 }
 559
 560 /* Offload a VLAN installed on the bridge or on a foreign interface by
 561  * installing it as a VLAN towards the CPU port.
 562  */
 563 static int dsa_slave_host_vlan_add(struct net_device *dev,
 564                                    const struct switchdev_obj *obj,
 565                                    struct netlink_ext_ack *extack)
 566 {
 567         struct dsa_port *dp = dsa_slave_to_port(dev);
 568         struct switchdev_obj_port_vlan vlan;
 569
 570         /* Do nothing if this is a software bridge */
 571         if (!dp->bridge)
 572                 return -EOPNOTSUPP;
 573
 574         if (dsa_port_skip_vlan_configuration(dp)) {
 575                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 576                 return 0;
 577         }
 578
 579         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 580
 581         /* Even though drivers often handle CPU membership in special ways,
 582          * it doesn't make sense to program a PVID, so clear this flag.
 583          */
 584         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 585
 586         return dsa_port_host_vlan_add(dp, &vlan, extack);
 587 }
 588
 589 static int dsa_slave_port_obj_add(struct net_device *dev, const void *ctx,
 590                                   const struct switchdev_obj *obj,
 591                                   struct netlink_ext_ack *extack)
 592 {
 593         struct dsa_port *dp = dsa_slave_to_port(dev);
 594         int err;
 595
 596         if (ctx && ctx != dp)
 597                 return 0;
 598
 599         switch (obj->id) {
 600         case SWITCHDEV_OBJ_ID_PORT_MDB:
 601                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 602                         return -EOPNOTSUPP;
 603
 604                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 605                 break;
 606         case SWITCHDEV_OBJ_ID_HOST_MDB:
 607                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 608                         return -EOPNOTSUPP;
 609
 610                 err = dsa_port_bridge_host_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 611                 break;
 612         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 613                 if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 614                         err = dsa_slave_vlan_add(dev, obj, extack);
 615                 else
 616                         err = dsa_slave_host_vlan_add(dev, obj, extack);
 617                 break;
 618         case SWITCHDEV_OBJ_ID_MRP:
 619                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 620                         return -EOPNOTSUPP;
 621
 622                 err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 623                 break;
 624         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 625                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 626                         return -EOPNOTSUPP;
 627
 628                 err = dsa_port_mrp_add_ring_role(dp,
 629                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 630                 break;
 631         default:
 632                 err = -EOPNOTSUPP;
 633                 break;
 634         }
 635
 636         return err;
 637 }
 638
 639 static int dsa_slave_vlan_del(struct net_device *dev,
 640                               const struct switchdev_obj *obj)
 641 {
 642         struct dsa_port *dp = dsa_slave_to_port(dev);
 643         struct switchdev_obj_port_vlan *vlan;
 644
 645         if (dsa_port_skip_vlan_configuration(dp))
 646                 return 0;
 647
 648         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 649
 650         return dsa_port_vlan_del(dp, vlan);
 651 }
 652
 653 static int dsa_slave_host_vlan_del(struct net_device *dev,
 654                                    const struct switchdev_obj *obj)
 655 {
 656         struct dsa_port *dp = dsa_slave_to_port(dev);
 657         struct switchdev_obj_port_vlan *vlan;
 658
 659         /* Do nothing if this is a software bridge */
 660         if (!dp->bridge)
 661                 return -EOPNOTSUPP;
 662
 663         if (dsa_port_skip_vlan_configuration(dp))
 664                 return 0;
 665
 666         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 667
 668         return dsa_port_host_vlan_del(dp, vlan);
 669 }
 670
 671 static int dsa_slave_port_obj_del(struct net_device *dev, const void *ctx,
 672                                   const struct switchdev_obj *obj)
 673 {
 674         struct dsa_port *dp = dsa_slave_to_port(dev);
 675         int err;
 676
 677         if (ctx && ctx != dp)
 678                 return 0;
 679
 680         switch (obj->id) {
 681         case SWITCHDEV_OBJ_ID_PORT_MDB:
 682                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 683                         return -EOPNOTSUPP;
 684
 685                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 686                 break;
 687         case SWITCHDEV_OBJ_ID_HOST_MDB:
 688                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 689                         return -EOPNOTSUPP;
 690
 691                 err = dsa_port_bridge_host_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 692                 break;
 693         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 694                 if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 695                         err = dsa_slave_vlan_del(dev, obj);
 696                 else
 697                         err = dsa_slave_host_vlan_del(dev, obj);
 698                 break;
 699         case SWITCHDEV_OBJ_ID_MRP:
 700                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 701                         return -EOPNOTSUPP;
 702
 703                 err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 704                 break;
 705         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 706                 if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
 707                         return -EOPNOTSUPP;
 708
 709                 err = dsa_port_mrp_del_ring_role(dp,
 710                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 711                 break;
 712         default:
 713                 err = -EOPNOTSUPP;
 714                 break;
 715         }
 716
 717         return err;
 718 }
 719
 720 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 721                                                      struct sk_buff *skb)
 722 {
 723 #ifdef CONFIG_NET_POLL_CONTROLLER
 724         struct dsa_slave_priv *p = netdev_priv(dev);
 725
 726         return netpoll_send_skb(p->netpoll, skb);
 727 #else
 728         BUG();
 729         return NETDEV_TX_OK;
 730 #endif
 731 }
 732
 733 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 734                                  struct sk_buff *skb)
 735 {
 736         struct dsa_switch *ds = p->dp->ds;
 737
 738         if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 739                 return;
 740
 741         if (!ds->ops->port_txtstamp)
 742                 return;
 743
 744         ds->ops->port_txtstamp(ds, p->dp->index, skb);
 745 }
 746
 747 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 748 {
 749         /* SKB for netpoll still need to be mangled with the protocol-specific
 750          * tag to be successfully transmitted
 751          */
 752         if (unlikely(netpoll_tx_running(dev)))
 753                 return dsa_slave_netpoll_send_skb(dev, skb);
 754
 755         /* Queue the SKB for transmission on the parent interface, but
 756          * do not modify its EtherType
 757          */
 758         skb->dev = dsa_slave_to_master(dev);
 759         dev_queue_xmit(skb);
 760
 761         return NETDEV_TX_OK;
 762 }
 763 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 764
 765 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 766 {
 767         int needed_headroom = dev->needed_headroom;
 768         int needed_tailroom = dev->needed_tailroom;
 769
 770         /* For tail taggers, we need to pad short frames ourselves, to ensure
 771          * that the tail tag does not fail at its role of being at the end of
 772          * the packet, once the master interface pads the frame. Account for
 773          * that pad length here, and pad later.
 774          */
 775         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 776                 needed_tailroom += ETH_ZLEN - skb->len;
 777         /* skb_headroom() returns unsigned int... */
 778         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 779         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 780
 781         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 782                 /* No reallocation needed, yay! */
 783                 return 0;
 784
 785         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 786                                 GFP_ATOMIC);
 787 }
 788
 789 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 790 {
 791         struct dsa_slave_priv *p = netdev_priv(dev);
 792         struct sk_buff *nskb;
 793
 794         dev_sw_netstats_tx_add(dev, 1, skb->len);
 795
 796         memset(skb->cb, 0, sizeof(skb->cb));
 797
 798         /* Handle tx timestamp if any */
 799         dsa_skb_tx_timestamp(p, skb);
 800
 801         if (dsa_realloc_skb(skb, dev)) {
 802                 dev_kfree_skb_any(skb);
 803                 return NETDEV_TX_OK;
 804         }
 805
 806         /* needed_tailroom should still be 'warm' in the cache line from
 807          * dsa_realloc_skb(), which has also ensured that padding is safe.
 808          */
 809         if (dev->needed_tailroom)
 810                 eth_skb_pad(skb);
 811
 812         /* Transmit function may have to reallocate the original SKB,
 813          * in which case it must have freed it. Only free it here on error.
 814          */
 815         nskb = p->xmit(skb, dev);
 816         if (!nskb) {
 817                 kfree_skb(skb);
 818                 return NETDEV_TX_OK;
 819         }
 820
 821         return dsa_enqueue_skb(nskb, dev);
 822 }
 823
 824 /* ethtool operations *******************************************************/
 825
 826 static void dsa_slave_get_drvinfo(struct net_device *dev,
 827                                   struct ethtool_drvinfo *drvinfo)
 828 {
 829         strscpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 830         strscpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 831         strscpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 832 }
 833
 834 static int dsa_slave_get_regs_len(struct net_device *dev)
 835 {
 836         struct dsa_port *dp = dsa_slave_to_port(dev);
 837         struct dsa_switch *ds = dp->ds;
 838
 839         if (ds->ops->get_regs_len)
 840                 return ds->ops->get_regs_len(ds, dp->index);
 841
 842         return -EOPNOTSUPP;
 843 }
 844
 845 static void
 846 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 847 {
 848         struct dsa_port *dp = dsa_slave_to_port(dev);
 849         struct dsa_switch *ds = dp->ds;
 850
 851         if (ds->ops->get_regs)
 852                 ds->ops->get_regs(ds, dp->index, regs, _p);
 853 }
 854
 855 static int dsa_slave_nway_reset(struct net_device *dev)
 856 {
 857         struct dsa_port *dp = dsa_slave_to_port(dev);
 858
 859         return phylink_ethtool_nway_reset(dp->pl);
 860 }
 861
 862 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 863 {
 864         struct dsa_port *dp = dsa_slave_to_port(dev);
 865         struct dsa_switch *ds = dp->ds;
 866
 867         if (ds->cd && ds->cd->eeprom_len)
 868                 return ds->cd->eeprom_len;
 869
 870         if (ds->ops->get_eeprom_len)
 871                 return ds->ops->get_eeprom_len(ds);
 872
 873         return 0;
 874 }
 875
 876 static int dsa_slave_get_eeprom(struct net_device *dev,
 877                                 struct ethtool_eeprom *eeprom, u8 *data)
 878 {
 879         struct dsa_port *dp = dsa_slave_to_port(dev);
 880         struct dsa_switch *ds = dp->ds;
 881
 882         if (ds->ops->get_eeprom)
 883                 return ds->ops->get_eeprom(ds, eeprom, data);
 884
 885         return -EOPNOTSUPP;
 886 }
 887
 888 static int dsa_slave_set_eeprom(struct net_device *dev,
 889                                 struct ethtool_eeprom *eeprom, u8 *data)
 890 {
 891         struct dsa_port *dp = dsa_slave_to_port(dev);
 892         struct dsa_switch *ds = dp->ds;
 893
 894         if (ds->ops->set_eeprom)
 895                 return ds->ops->set_eeprom(ds, eeprom, data);
 896
 897         return -EOPNOTSUPP;
 898 }
 899
 900 static void dsa_slave_get_strings(struct net_device *dev,
 901                                   uint32_t stringset, uint8_t *data)
 902 {
 903         struct dsa_port *dp = dsa_slave_to_port(dev);
 904         struct dsa_switch *ds = dp->ds;
 905
 906         if (stringset == ETH_SS_STATS) {
 907                 int len = ETH_GSTRING_LEN;
 908
 909                 strncpy(data, "tx_packets", len);
 910                 strncpy(data + len, "tx_bytes", len);
 911                 strncpy(data + 2 * len, "rx_packets", len);
 912                 strncpy(data + 3 * len, "rx_bytes", len);
 913                 if (ds->ops->get_strings)
 914                         ds->ops->get_strings(ds, dp->index, stringset,
 915                                              data + 4 * len);
 916         } else if (stringset ==  ETH_SS_TEST) {
 917                 net_selftest_get_strings(data);
 918         }
 919
 920 }
 921
 922 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 923                                         struct ethtool_stats *stats,
 924                                         uint64_t *data)
 925 {
 926         struct dsa_port *dp = dsa_slave_to_port(dev);
 927         struct dsa_switch *ds = dp->ds;
 928         struct pcpu_sw_netstats *s;
 929         unsigned int start;
 930         int i;
 931
 932         for_each_possible_cpu(i) {
 933                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 934
 935                 s = per_cpu_ptr(dev->tstats, i);
 936                 do {
 937                         start = u64_stats_fetch_begin_irq(&s->syncp);
 938                         tx_packets = u64_stats_read(&s->tx_packets);
 939                         tx_bytes = u64_stats_read(&s->tx_bytes);
 940                         rx_packets = u64_stats_read(&s->rx_packets);
 941                         rx_bytes = u64_stats_read(&s->rx_bytes);
 942                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 943                 data[0] += tx_packets;
 944                 data[1] += tx_bytes;
 945                 data[2] += rx_packets;
 946                 data[3] += rx_bytes;
 947         }
 948         if (ds->ops->get_ethtool_stats)
 949                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 950 }
 951
 952 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 953 {
 954         struct dsa_port *dp = dsa_slave_to_port(dev);
 955         struct dsa_switch *ds = dp->ds;
 956
 957         if (sset == ETH_SS_STATS) {
 958                 int count = 0;
 959
 960                 if (ds->ops->get_sset_count) {
 961                         count = ds->ops->get_sset_count(ds, dp->index, sset);
 962                         if (count < 0)
 963                                 return count;
 964                 }
 965
 966                 return count + 4;
 967         } else if (sset ==  ETH_SS_TEST) {
 968                 return net_selftest_get_count();
 969         }
 970
 971         return -EOPNOTSUPP;
 972 }
 973
 974 static void dsa_slave_get_eth_phy_stats(struct net_device *dev,
 975                                         struct ethtool_eth_phy_stats *phy_stats)
 976 {
 977         struct dsa_port *dp = dsa_slave_to_port(dev);
 978         struct dsa_switch *ds = dp->ds;
 979
 980         if (ds->ops->get_eth_phy_stats)
 981                 ds->ops->get_eth_phy_stats(ds, dp->index, phy_stats);
 982 }
 983
 984 static void dsa_slave_get_eth_mac_stats(struct net_device *dev,
 985                                         struct ethtool_eth_mac_stats *mac_stats)
 986 {
 987         struct dsa_port *dp = dsa_slave_to_port(dev);
 988         struct dsa_switch *ds = dp->ds;
 989
 990         if (ds->ops->get_eth_mac_stats)
 991                 ds->ops->get_eth_mac_stats(ds, dp->index, mac_stats);
 992 }
 993
 994 static void
 995 dsa_slave_get_eth_ctrl_stats(struct net_device *dev,
 996                              struct ethtool_eth_ctrl_stats *ctrl_stats)
 997 {
 998         struct dsa_port *dp = dsa_slave_to_port(dev);
 999         struct dsa_switch *ds = dp->ds;
1000
1001         if (ds->ops->get_eth_ctrl_stats)
1002                 ds->ops->get_eth_ctrl_stats(ds, dp->index, ctrl_stats);
1003 }
1004
1005 static void
1006 dsa_slave_get_rmon_stats(struct net_device *dev,
1007                          struct ethtool_rmon_stats *rmon_stats,
1008                          const struct ethtool_rmon_hist_range **ranges)
1009 {
1010         struct dsa_port *dp = dsa_slave_to_port(dev);
1011         struct dsa_switch *ds = dp->ds;
1012
1013         if (ds->ops->get_rmon_stats)
1014                 ds->ops->get_rmon_stats(ds, dp->index, rmon_stats, ranges);
1015 }
1016
1017 static void dsa_slave_net_selftest(struct net_device *ndev,
1018                                    struct ethtool_test *etest, u64 *buf)
1019 {
1020         struct dsa_port *dp = dsa_slave_to_port(ndev);
1021         struct dsa_switch *ds = dp->ds;
1022
1023         if (ds->ops->self_test) {
1024                 ds->ops->self_test(ds, dp->index, etest, buf);
1025                 return;
1026         }
1027
1028         net_selftest(ndev, etest, buf);
1029 }
1030
1031 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1032 {
1033         struct dsa_port *dp = dsa_slave_to_port(dev);
1034         struct dsa_switch *ds = dp->ds;
1035
1036         phylink_ethtool_get_wol(dp->pl, w);
1037
1038         if (ds->ops->get_wol)
1039                 ds->ops->get_wol(ds, dp->index, w);
1040 }
1041
1042 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1043 {
1044         struct dsa_port *dp = dsa_slave_to_port(dev);
1045         struct dsa_switch *ds = dp->ds;
1046         int ret = -EOPNOTSUPP;
1047
1048         phylink_ethtool_set_wol(dp->pl, w);
1049
1050         if (ds->ops->set_wol)
1051                 ret = ds->ops->set_wol(ds, dp->index, w);
1052
1053         return ret;
1054 }
1055
1056 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
1057 {
1058         struct dsa_port *dp = dsa_slave_to_port(dev);
1059         struct dsa_switch *ds = dp->ds;
1060         int ret;
1061
1062         /* Port's PHY and MAC both need to be EEE capable */
1063         if (!dev->phydev || !dp->pl)
1064                 return -ENODEV;
1065
1066         if (!ds->ops->set_mac_eee)
1067                 return -EOPNOTSUPP;
1068
1069         ret = ds->ops->set_mac_eee(ds, dp->index, e);
1070         if (ret)
1071                 return ret;
1072
1073         return phylink_ethtool_set_eee(dp->pl, e);
1074 }
1075
1076 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
1077 {
1078         struct dsa_port *dp = dsa_slave_to_port(dev);
1079         struct dsa_switch *ds = dp->ds;
1080         int ret;
1081
1082         /* Port's PHY and MAC both need to be EEE capable */
1083         if (!dev->phydev || !dp->pl)
1084                 return -ENODEV;
1085
1086         if (!ds->ops->get_mac_eee)
1087                 return -EOPNOTSUPP;
1088
1089         ret = ds->ops->get_mac_eee(ds, dp->index, e);
1090         if (ret)
1091                 return ret;
1092
1093         return phylink_ethtool_get_eee(dp->pl, e);
1094 }
1095
1096 static int dsa_slave_get_link_ksettings(struct net_device *dev,
1097                                         struct ethtool_link_ksettings *cmd)
1098 {
1099         struct dsa_port *dp = dsa_slave_to_port(dev);
1100
1101         return phylink_ethtool_ksettings_get(dp->pl, cmd);
1102 }
1103
1104 static int dsa_slave_set_link_ksettings(struct net_device *dev,
1105                                         const struct ethtool_link_ksettings *cmd)
1106 {
1107         struct dsa_port *dp = dsa_slave_to_port(dev);
1108
1109         return phylink_ethtool_ksettings_set(dp->pl, cmd);
1110 }
1111
1112 static void dsa_slave_get_pause_stats(struct net_device *dev,
1113                                   struct ethtool_pause_stats *pause_stats)
1114 {
1115         struct dsa_port *dp = dsa_slave_to_port(dev);
1116         struct dsa_switch *ds = dp->ds;
1117
1118         if (ds->ops->get_pause_stats)
1119                 ds->ops->get_pause_stats(ds, dp->index, pause_stats);
1120 }
1121
1122 static void dsa_slave_get_pauseparam(struct net_device *dev,
1123                                      struct ethtool_pauseparam *pause)
1124 {
1125         struct dsa_port *dp = dsa_slave_to_port(dev);
1126
1127         phylink_ethtool_get_pauseparam(dp->pl, pause);
1128 }
1129
1130 static int dsa_slave_set_pauseparam(struct net_device *dev,
1131                                     struct ethtool_pauseparam *pause)
1132 {
1133         struct dsa_port *dp = dsa_slave_to_port(dev);
1134
1135         return phylink_ethtool_set_pauseparam(dp->pl, pause);
1136 }
1137
1138 #ifdef CONFIG_NET_POLL_CONTROLLER
1139 static int dsa_slave_netpoll_setup(struct net_device *dev,
1140                                    struct netpoll_info *ni)
1141 {
1142         struct net_device *master = dsa_slave_to_master(dev);
1143         struct dsa_slave_priv *p = netdev_priv(dev);
1144         struct netpoll *netpoll;
1145         int err = 0;
1146
1147         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1148         if (!netpoll)
1149                 return -ENOMEM;
1150
1151         err = __netpoll_setup(netpoll, master);
1152         if (err) {
1153                 kfree(netpoll);
1154                 goto out;
1155         }
1156
1157         p->netpoll = netpoll;
1158 out:
1159         return err;
1160 }
1161
1162 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
1163 {
1164         struct dsa_slave_priv *p = netdev_priv(dev);
1165         struct netpoll *netpoll = p->netpoll;
1166
1167         if (!netpoll)
1168                 return;
1169
1170         p->netpoll = NULL;
1171
1172         __netpoll_free(netpoll);
1173 }
1174
1175 static void dsa_slave_poll_controller(struct net_device *dev)
1176 {
1177 }
1178 #endif
1179
1180 static struct dsa_mall_tc_entry *
1181 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
1182 {
1183         struct dsa_slave_priv *p = netdev_priv(dev);
1184         struct dsa_mall_tc_entry *mall_tc_entry;
1185
1186         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
1187                 if (mall_tc_entry->cookie == cookie)
1188                         return mall_tc_entry;
1189
1190         return NULL;
1191 }
1192
1193 static int
1194 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
1195                                   struct tc_cls_matchall_offload *cls,
1196                                   bool ingress)
1197 {
1198         struct netlink_ext_ack *extack = cls->common.extack;
1199         struct dsa_port *dp = dsa_slave_to_port(dev);
1200         struct dsa_slave_priv *p = netdev_priv(dev);
1201         struct dsa_mall_mirror_tc_entry *mirror;
1202         struct dsa_mall_tc_entry *mall_tc_entry;
1203         struct dsa_switch *ds = dp->ds;
1204         struct flow_action_entry *act;
1205         struct dsa_port *to_dp;
1206         int err;
1207
1208         if (!ds->ops->port_mirror_add)
1209                 return -EOPNOTSUPP;
1210
1211         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1212                                               cls->common.extack))
1213                 return -EOPNOTSUPP;
1214
1215         act = &cls->rule->action.entries[0];
1216
1217         if (!act->dev)
1218                 return -EINVAL;
1219
1220         if (!dsa_slave_dev_check(act->dev))
1221                 return -EOPNOTSUPP;
1222
1223         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1224         if (!mall_tc_entry)
1225                 return -ENOMEM;
1226
1227         mall_tc_entry->cookie = cls->cookie;
1228         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1229         mirror = &mall_tc_entry->mirror;
1230
1231         to_dp = dsa_slave_to_port(act->dev);
1232
1233         mirror->to_local_port = to_dp->index;
1234         mirror->ingress = ingress;
1235
1236         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress, extack);
1237         if (err) {
1238                 kfree(mall_tc_entry);
1239                 return err;
1240         }
1241
1242         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1243
1244         return err;
1245 }
1246
1247 static int
1248 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1249                                   struct tc_cls_matchall_offload *cls,
1250                                   bool ingress)
1251 {
1252         struct netlink_ext_ack *extack = cls->common.extack;
1253         struct dsa_port *dp = dsa_slave_to_port(dev);
1254         struct dsa_slave_priv *p = netdev_priv(dev);
1255         struct dsa_mall_policer_tc_entry *policer;
1256         struct dsa_mall_tc_entry *mall_tc_entry;
1257         struct dsa_switch *ds = dp->ds;
1258         struct flow_action_entry *act;
1259         int err;
1260
1261         if (!ds->ops->port_policer_add) {
1262                 NL_SET_ERR_MSG_MOD(extack,
1263                                    "Policing offload not implemented");
1264                 return -EOPNOTSUPP;
1265         }
1266
1267         if (!ingress) {
1268                 NL_SET_ERR_MSG_MOD(extack,
1269                                    "Only supported on ingress qdisc");
1270                 return -EOPNOTSUPP;
1271         }
1272
1273         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1274                                               cls->common.extack))
1275                 return -EOPNOTSUPP;
1276
1277         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1278                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1279                         NL_SET_ERR_MSG_MOD(extack,
1280                                            "Only one port policer allowed");
1281                         return -EEXIST;
1282                 }
1283         }
1284
1285         act = &cls->rule->action.entries[0];
1286
1287         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1288         if (!mall_tc_entry)
1289                 return -ENOMEM;
1290
1291         mall_tc_entry->cookie = cls->cookie;
1292         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1293         policer = &mall_tc_entry->policer;
1294         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1295         policer->burst = act->police.burst;
1296
1297         err = ds->ops->port_policer_add(ds, dp->index, policer);
1298         if (err) {
1299                 kfree(mall_tc_entry);
1300                 return err;
1301         }
1302
1303         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1304
1305         return err;
1306 }
1307
1308 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1309                                       struct tc_cls_matchall_offload *cls,
1310                                       bool ingress)
1311 {
1312         int err = -EOPNOTSUPP;
1313
1314         if (cls->common.protocol == htons(ETH_P_ALL) &&
1315             flow_offload_has_one_action(&cls->rule->action) &&
1316             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1317                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1318         else if (flow_offload_has_one_action(&cls->rule->action) &&
1319                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1320                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1321
1322         return err;
1323 }
1324
1325 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1326                                        struct tc_cls_matchall_offload *cls)
1327 {
1328         struct dsa_port *dp = dsa_slave_to_port(dev);
1329         struct dsa_mall_tc_entry *mall_tc_entry;
1330         struct dsa_switch *ds = dp->ds;
1331
1332         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1333         if (!mall_tc_entry)
1334                 return;
1335
1336         list_del(&mall_tc_entry->list);
1337
1338         switch (mall_tc_entry->type) {
1339         case DSA_PORT_MALL_MIRROR:
1340                 if (ds->ops->port_mirror_del)
1341                         ds->ops->port_mirror_del(ds, dp->index,
1342                                                  &mall_tc_entry->mirror);
1343                 break;
1344         case DSA_PORT_MALL_POLICER:
1345                 if (ds->ops->port_policer_del)
1346                         ds->ops->port_policer_del(ds, dp->index);
1347                 break;
1348         default:
1349                 WARN_ON(1);
1350         }
1351
1352         kfree(mall_tc_entry);
1353 }
1354
1355 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1356                                            struct tc_cls_matchall_offload *cls,
1357                                            bool ingress)
1358 {
1359         if (cls->common.chain_index)
1360                 return -EOPNOTSUPP;
1361
1362         switch (cls->command) {
1363         case TC_CLSMATCHALL_REPLACE:
1364                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1365         case TC_CLSMATCHALL_DESTROY:
1366                 dsa_slave_del_cls_matchall(dev, cls);
1367                 return 0;
1368         default:
1369                 return -EOPNOTSUPP;
1370         }
1371 }
1372
1373 static int dsa_slave_add_cls_flower(struct net_device *dev,
1374                                     struct flow_cls_offload *cls,
1375                                     bool ingress)
1376 {
1377         struct dsa_port *dp = dsa_slave_to_port(dev);
1378         struct dsa_switch *ds = dp->ds;
1379         int port = dp->index;
1380
1381         if (!ds->ops->cls_flower_add)
1382                 return -EOPNOTSUPP;
1383
1384         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1385 }
1386
1387 static int dsa_slave_del_cls_flower(struct net_device *dev,
1388                                     struct flow_cls_offload *cls,
1389                                     bool ingress)
1390 {
1391         struct dsa_port *dp = dsa_slave_to_port(dev);
1392         struct dsa_switch *ds = dp->ds;
1393         int port = dp->index;
1394
1395         if (!ds->ops->cls_flower_del)
1396                 return -EOPNOTSUPP;
1397
1398         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1399 }
1400
1401 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1402                                       struct flow_cls_offload *cls,
1403                                       bool ingress)
1404 {
1405         struct dsa_port *dp = dsa_slave_to_port(dev);
1406         struct dsa_switch *ds = dp->ds;
1407         int port = dp->index;
1408
1409         if (!ds->ops->cls_flower_stats)
1410                 return -EOPNOTSUPP;
1411
1412         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1413 }
1414
1415 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1416                                          struct flow_cls_offload *cls,
1417                                          bool ingress)
1418 {
1419         switch (cls->command) {
1420         case FLOW_CLS_REPLACE:
1421                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1422         case FLOW_CLS_DESTROY:
1423                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1424         case FLOW_CLS_STATS:
1425                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1426         default:
1427                 return -EOPNOTSUPP;
1428         }
1429 }
1430
1431 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1432                                        void *cb_priv, bool ingress)
1433 {
1434         struct net_device *dev = cb_priv;
1435
1436         if (!tc_can_offload(dev))
1437                 return -EOPNOTSUPP;
1438
1439         switch (type) {
1440         case TC_SETUP_CLSMATCHALL:
1441                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1442         case TC_SETUP_CLSFLOWER:
1443                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1444         default:
1445                 return -EOPNOTSUPP;
1446         }
1447 }
1448
1449 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1450                                           void *type_data, void *cb_priv)
1451 {
1452         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1453 }
1454
1455 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1456                                           void *type_data, void *cb_priv)
1457 {
1458         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1459 }
1460
1461 static LIST_HEAD(dsa_slave_block_cb_list);
1462
1463 static int dsa_slave_setup_tc_block(struct net_device *dev,
1464                                     struct flow_block_offload *f)
1465 {
1466         struct flow_block_cb *block_cb;
1467         flow_setup_cb_t *cb;
1468
1469         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1470                 cb = dsa_slave_setup_tc_block_cb_ig;
1471         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1472                 cb = dsa_slave_setup_tc_block_cb_eg;
1473         else
1474                 return -EOPNOTSUPP;
1475
1476         f->driver_block_list = &dsa_slave_block_cb_list;
1477
1478         switch (f->command) {
1479         case FLOW_BLOCK_BIND:
1480                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1481                         return -EBUSY;
1482
1483                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1484                 if (IS_ERR(block_cb))
1485                         return PTR_ERR(block_cb);
1486
1487                 flow_block_cb_add(block_cb, f);
1488                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1489                 return 0;
1490         case FLOW_BLOCK_UNBIND:
1491                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1492                 if (!block_cb)
1493                         return -ENOENT;
1494
1495                 flow_block_cb_remove(block_cb, f);
1496                 list_del(&block_cb->driver_list);
1497                 return 0;
1498         default:
1499                 return -EOPNOTSUPP;
1500         }
1501 }
1502
1503 static int dsa_slave_setup_ft_block(struct dsa_switch *ds, int port,
1504                                     void *type_data)
1505 {
1506         struct dsa_port *cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1507         struct net_device *master = cpu_dp->master;
1508
1509         if (!master->netdev_ops->ndo_setup_tc)
1510                 return -EOPNOTSUPP;
1511
1512         return master->netdev_ops->ndo_setup_tc(master, TC_SETUP_FT, type_data);
1513 }
1514
1515 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1516                               void *type_data)
1517 {
1518         struct dsa_port *dp = dsa_slave_to_port(dev);
1519         struct dsa_switch *ds = dp->ds;
1520
1521         switch (type) {
1522         case TC_SETUP_BLOCK:
1523                 return dsa_slave_setup_tc_block(dev, type_data);
1524         case TC_SETUP_FT:
1525                 return dsa_slave_setup_ft_block(ds, dp->index, type_data);
1526         default:
1527                 break;
1528         }
1529
1530         if (!ds->ops->port_setup_tc)
1531                 return -EOPNOTSUPP;
1532
1533         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1534 }
1535
1536 static int dsa_slave_get_rxnfc(struct net_device *dev,
1537                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1538 {
1539         struct dsa_port *dp = dsa_slave_to_port(dev);
1540         struct dsa_switch *ds = dp->ds;
1541
1542         if (!ds->ops->get_rxnfc)
1543                 return -EOPNOTSUPP;
1544
1545         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1546 }
1547
1548 static int dsa_slave_set_rxnfc(struct net_device *dev,
1549                                struct ethtool_rxnfc *nfc)
1550 {
1551         struct dsa_port *dp = dsa_slave_to_port(dev);
1552         struct dsa_switch *ds = dp->ds;
1553
1554         if (!ds->ops->set_rxnfc)
1555                 return -EOPNOTSUPP;
1556
1557         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1558 }
1559
1560 static int dsa_slave_get_ts_info(struct net_device *dev,
1561                                  struct ethtool_ts_info *ts)
1562 {
1563         struct dsa_slave_priv *p = netdev_priv(dev);
1564         struct dsa_switch *ds = p->dp->ds;
1565
1566         if (!ds->ops->get_ts_info)
1567                 return -EOPNOTSUPP;
1568
1569         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1570 }
1571
1572 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1573                                      u16 vid)
1574 {
1575         struct dsa_port *dp = dsa_slave_to_port(dev);
1576         struct switchdev_obj_port_vlan vlan = {
1577                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1578                 .vid = vid,
1579                 /* This API only allows programming tagged, non-PVID VIDs */
1580                 .flags = 0,
1581         };
1582         struct netlink_ext_ack extack = {0};
1583         int ret;
1584
1585         /* User port... */
1586         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1587         if (ret) {
1588                 if (extack._msg)
1589                         netdev_err(dev, "%s\n", extack._msg);
1590                 return ret;
1591         }
1592
1593         /* And CPU port... */
1594         ret = dsa_port_host_vlan_add(dp, &vlan, &extack);
1595         if (ret) {
1596                 if (extack._msg)
1597                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1598                                    extack._msg);
1599                 return ret;
1600         }
1601
1602         return 0;
1603 }
1604
1605 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1606                                       u16 vid)
1607 {
1608         struct dsa_port *dp = dsa_slave_to_port(dev);
1609         struct switchdev_obj_port_vlan vlan = {
1610                 .vid = vid,
1611                 /* This API only allows programming tagged, non-PVID VIDs */
1612                 .flags = 0,
1613         };
1614         int err;
1615
1616         err = dsa_port_vlan_del(dp, &vlan);
1617         if (err)
1618                 return err;
1619
1620         return dsa_port_host_vlan_del(dp, &vlan);
1621 }
1622
1623 static int dsa_slave_restore_vlan(struct net_device *vdev, int vid, void *arg)
1624 {
1625         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1626
1627         return dsa_slave_vlan_rx_add_vid(arg, proto, vid);
1628 }
1629
1630 static int dsa_slave_clear_vlan(struct net_device *vdev, int vid, void *arg)
1631 {
1632         __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1633
1634         return dsa_slave_vlan_rx_kill_vid(arg, proto, vid);
1635 }
1636
1637 /* Keep the VLAN RX filtering list in sync with the hardware only if VLAN
1638  * filtering is enabled. The baseline is that only ports that offload a
1639  * VLAN-aware bridge are VLAN-aware, and standalone ports are VLAN-unaware,
1640  * but there are exceptions for quirky hardware.
1641  *
1642  * If ds->vlan_filtering_is_global = true, then standalone ports which share
1643  * the same switch with other ports that offload a VLAN-aware bridge are also
1644  * inevitably VLAN-aware.
1645  *
1646  * To summarize, a DSA switch port offloads:
1647  *
1648  * - If standalone (this includes software bridge, software LAG):
1649  *     - if ds->needs_standalone_vlan_filtering = true, OR if
1650  *       (ds->vlan_filtering_is_global = true AND there are bridges spanning
1651  *       this switch chip which have vlan_filtering=1)
1652  *         - the 8021q upper VLANs
1653  *     - else (standalone VLAN filtering is not needed, VLAN filtering is not
1654  *       global, or it is, but no port is under a VLAN-aware bridge):
1655  *         - no VLAN (any 8021q upper is a software VLAN)
1656  *
1657  * - If under a vlan_filtering=0 bridge which it offload:
1658  *     - if ds->configure_vlan_while_not_filtering = true (default):
1659  *         - the bridge VLANs. These VLANs are committed to hardware but inactive.
1660  *     - else (deprecated):
1661  *         - no VLAN. The bridge VLANs are not restored when VLAN awareness is
1662  *           enabled, so this behavior is broken and discouraged.
1663  *
1664  * - If under a vlan_filtering=1 bridge which it offload:
1665  *     - the bridge VLANs
1666  *     - the 8021q upper VLANs
1667  */
1668 int dsa_slave_manage_vlan_filtering(struct net_device *slave,
1669                                     bool vlan_filtering)
1670 {
1671         int err;
1672
1673         if (vlan_filtering) {
1674                 slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1675
1676                 err = vlan_for_each(slave, dsa_slave_restore_vlan, slave);
1677                 if (err) {
1678                         vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1679                         slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1680                         return err;
1681                 }
1682         } else {
1683                 err = vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1684                 if (err)
1685                         return err;
1686
1687                 slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1688         }
1689
1690         return 0;
1691 }
1692
1693 struct dsa_hw_port {
1694         struct list_head list;
1695         struct net_device *dev;
1696         int old_mtu;
1697 };
1698
1699 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1700 {
1701         const struct dsa_hw_port *p;
1702         int err;
1703
1704         list_for_each_entry(p, hw_port_list, list) {
1705                 if (p->dev->mtu == mtu)
1706                         continue;
1707
1708                 err = dev_set_mtu(p->dev, mtu);
1709                 if (err)
1710                         goto rollback;
1711         }
1712
1713         return 0;
1714
1715 rollback:
1716         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1717                 if (p->dev->mtu == p->old_mtu)
1718                         continue;
1719
1720                 if (dev_set_mtu(p->dev, p->old_mtu))
1721                         netdev_err(p->dev, "Failed to restore MTU\n");
1722         }
1723
1724         return err;
1725 }
1726
1727 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1728 {
1729         struct dsa_hw_port *p, *n;
1730
1731         list_for_each_entry_safe(p, n, hw_port_list, list)
1732                 kfree(p);
1733 }
1734
1735 /* Make the hardware datapath to/from @dev limited to a common MTU */
1736 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1737 {
1738         struct list_head hw_port_list;
1739         struct dsa_switch_tree *dst;
1740         int min_mtu = ETH_MAX_MTU;
1741         struct dsa_port *other_dp;
1742         int err;
1743
1744         if (!dp->ds->mtu_enforcement_ingress)
1745                 return;
1746
1747         if (!dp->bridge)
1748                 return;
1749
1750         INIT_LIST_HEAD(&hw_port_list);
1751
1752         /* Populate the list of ports that are part of the same bridge
1753          * as the newly added/modified port
1754          */
1755         list_for_each_entry(dst, &dsa_tree_list, list) {
1756                 list_for_each_entry(other_dp, &dst->ports, list) {
1757                         struct dsa_hw_port *hw_port;
1758                         struct net_device *slave;
1759
1760                         if (other_dp->type != DSA_PORT_TYPE_USER)
1761                                 continue;
1762
1763                         if (!dsa_port_bridge_same(dp, other_dp))
1764                                 continue;
1765
1766                         if (!other_dp->ds->mtu_enforcement_ingress)
1767                                 continue;
1768
1769                         slave = other_dp->slave;
1770
1771                         if (min_mtu > slave->mtu)
1772                                 min_mtu = slave->mtu;
1773
1774                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1775                         if (!hw_port)
1776                                 goto out;
1777
1778                         hw_port->dev = slave;
1779                         hw_port->old_mtu = slave->mtu;
1780
1781                         list_add(&hw_port->list, &hw_port_list);
1782                 }
1783         }
1784
1785         /* Attempt to configure the entire hardware bridge to the newly added
1786          * interface's MTU first, regardless of whether the intention of the
1787          * user was to raise or lower it.
1788          */
1789         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1790         if (!err)
1791                 goto out;
1792
1793         /* Clearly that didn't work out so well, so just set the minimum MTU on
1794          * all hardware bridge ports now. If this fails too, then all ports will
1795          * still have their old MTU rolled back anyway.
1796          */
1797         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1798
1799 out:
1800         dsa_hw_port_list_free(&hw_port_list);
1801 }
1802
1803 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1804 {
1805         struct net_device *master = dsa_slave_to_master(dev);
1806         struct dsa_port *dp = dsa_slave_to_port(dev);
1807         struct dsa_port *cpu_dp = dp->cpu_dp;
1808         struct dsa_switch *ds = dp->ds;
1809         struct dsa_port *other_dp;
1810         int largest_mtu = 0;
1811         int new_master_mtu;
1812         int old_master_mtu;
1813         int mtu_limit;
1814         int cpu_mtu;
1815         int err;
1816
1817         if (!ds->ops->port_change_mtu)
1818                 return -EOPNOTSUPP;
1819
1820         dsa_tree_for_each_user_port(other_dp, ds->dst) {
1821                 int slave_mtu;
1822
1823                 /* During probe, this function will be called for each slave
1824                  * device, while not all of them have been allocated. That's
1825                  * ok, it doesn't change what the maximum is, so ignore it.
1826                  */
1827                 if (!other_dp->slave)
1828                         continue;
1829
1830                 /* Pretend that we already applied the setting, which we
1831                  * actually haven't (still haven't done all integrity checks)
1832                  */
1833                 if (dp == other_dp)
1834                         slave_mtu = new_mtu;
1835                 else
1836                         slave_mtu = other_dp->slave->mtu;
1837
1838                 if (largest_mtu < slave_mtu)
1839                         largest_mtu = slave_mtu;
1840         }
1841
1842         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1843         old_master_mtu = master->mtu;
1844         new_master_mtu = largest_mtu + dsa_tag_protocol_overhead(cpu_dp->tag_ops);
1845         if (new_master_mtu > mtu_limit)
1846                 return -ERANGE;
1847
1848         /* If the master MTU isn't over limit, there's no need to check the CPU
1849          * MTU, since that surely isn't either.
1850          */
1851         cpu_mtu = largest_mtu;
1852
1853         /* Start applying stuff */
1854         if (new_master_mtu != old_master_mtu) {
1855                 err = dev_set_mtu(master, new_master_mtu);
1856                 if (err < 0)
1857                         goto out_master_failed;
1858
1859                 /* We only need to propagate the MTU of the CPU port to
1860                  * upstream switches, so emit a notifier which updates them.
1861                  */
1862                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu);
1863                 if (err)
1864                         goto out_cpu_failed;
1865         }
1866
1867         err = ds->ops->port_change_mtu(ds, dp->index, new_mtu);
1868         if (err)
1869                 goto out_port_failed;
1870
1871         dev->mtu = new_mtu;
1872
1873         dsa_bridge_mtu_normalization(dp);
1874
1875         return 0;
1876
1877 out_port_failed:
1878         if (new_master_mtu != old_master_mtu)
1879                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1880                                     dsa_tag_protocol_overhead(cpu_dp->tag_ops));
1881 out_cpu_failed:
1882         if (new_master_mtu != old_master_mtu)
1883                 dev_set_mtu(master, old_master_mtu);
1884 out_master_failed:
1885         return err;
1886 }
1887
1888 static int __maybe_unused
1889 dsa_slave_dcbnl_set_default_prio(struct net_device *dev, struct dcb_app *app)
1890 {
1891         struct dsa_port *dp = dsa_slave_to_port(dev);
1892         struct dsa_switch *ds = dp->ds;
1893         unsigned long mask, new_prio;
1894         int err, port = dp->index;
1895
1896         if (!ds->ops->port_set_default_prio)
1897                 return -EOPNOTSUPP;
1898
1899         err = dcb_ieee_setapp(dev, app);
1900         if (err)
1901                 return err;
1902
1903         mask = dcb_ieee_getapp_mask(dev, app);
1904         new_prio = __fls(mask);
1905
1906         err = ds->ops->port_set_default_prio(ds, port, new_prio);
1907         if (err) {
1908                 dcb_ieee_delapp(dev, app);
1909                 return err;
1910         }
1911
1912         return 0;
1913 }
1914
1915 static int __maybe_unused
1916 dsa_slave_dcbnl_add_dscp_prio(struct net_device *dev, struct dcb_app *app)
1917 {
1918         struct dsa_port *dp = dsa_slave_to_port(dev);
1919         struct dsa_switch *ds = dp->ds;
1920         unsigned long mask, new_prio;
1921         int err, port = dp->index;
1922         u8 dscp = app->protocol;
1923
1924         if (!ds->ops->port_add_dscp_prio)
1925                 return -EOPNOTSUPP;
1926
1927         if (dscp >= 64) {
1928                 netdev_err(dev, "DSCP APP entry with protocol value %u is invalid\n",
1929                            dscp);
1930                 return -EINVAL;
1931         }
1932
1933         err = dcb_ieee_setapp(dev, app);
1934         if (err)
1935                 return err;
1936
1937         mask = dcb_ieee_getapp_mask(dev, app);
1938         new_prio = __fls(mask);
1939
1940         err = ds->ops->port_add_dscp_prio(ds, port, dscp, new_prio);
1941         if (err) {
1942                 dcb_ieee_delapp(dev, app);
1943                 return err;
1944         }
1945
1946         return 0;
1947 }
1948
1949 static int __maybe_unused dsa_slave_dcbnl_ieee_setapp(struct net_device *dev,
1950                                                       struct dcb_app *app)
1951 {
1952         switch (app->selector) {
1953         case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
1954                 switch (app->protocol) {
1955                 case 0:
1956                         return dsa_slave_dcbnl_set_default_prio(dev, app);
1957                 default:
1958                         return -EOPNOTSUPP;
1959                 }
1960                 break;
1961         case IEEE_8021QAZ_APP_SEL_DSCP:
1962                 return dsa_slave_dcbnl_add_dscp_prio(dev, app);
1963         default:
1964                 return -EOPNOTSUPP;
1965         }
1966 }
1967
1968 static int __maybe_unused
1969 dsa_slave_dcbnl_del_default_prio(struct net_device *dev, struct dcb_app *app)
1970 {
1971         struct dsa_port *dp = dsa_slave_to_port(dev);
1972         struct dsa_switch *ds = dp->ds;
1973         unsigned long mask, new_prio;
1974         int err, port = dp->index;
1975
1976         if (!ds->ops->port_set_default_prio)
1977                 return -EOPNOTSUPP;
1978
1979         err = dcb_ieee_delapp(dev, app);
1980         if (err)
1981                 return err;
1982
1983         mask = dcb_ieee_getapp_mask(dev, app);
1984         new_prio = mask ? __fls(mask) : 0;
1985
1986         err = ds->ops->port_set_default_prio(ds, port, new_prio);
1987         if (err) {
1988                 dcb_ieee_setapp(dev, app);
1989                 return err;
1990         }
1991
1992         return 0;
1993 }
1994
1995 static int __maybe_unused
1996 dsa_slave_dcbnl_del_dscp_prio(struct net_device *dev, struct dcb_app *app)
1997 {
1998         struct dsa_port *dp = dsa_slave_to_port(dev);
1999         struct dsa_switch *ds = dp->ds;
2000         int err, port = dp->index;
2001         u8 dscp = app->protocol;
2002
2003         if (!ds->ops->port_del_dscp_prio)
2004                 return -EOPNOTSUPP;
2005
2006         err = dcb_ieee_delapp(dev, app);
2007         if (err)
2008                 return err;
2009
2010         err = ds->ops->port_del_dscp_prio(ds, port, dscp, app->priority);
2011         if (err) {
2012                 dcb_ieee_setapp(dev, app);
2013                 return err;
2014         }
2015
2016         return 0;
2017 }
2018
2019 static int __maybe_unused dsa_slave_dcbnl_ieee_delapp(struct net_device *dev,
2020                                                       struct dcb_app *app)
2021 {
2022         switch (app->selector) {
2023         case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
2024                 switch (app->protocol) {
2025                 case 0:
2026                         return dsa_slave_dcbnl_del_default_prio(dev, app);
2027                 default:
2028                         return -EOPNOTSUPP;
2029                 }
2030                 break;
2031         case IEEE_8021QAZ_APP_SEL_DSCP:
2032                 return dsa_slave_dcbnl_del_dscp_prio(dev, app);
2033         default:
2034                 return -EOPNOTSUPP;
2035         }
2036 }
2037
2038 /* Pre-populate the DCB application priority table with the priorities
2039  * configured during switch setup, which we read from hardware here.
2040  */
2041 static int dsa_slave_dcbnl_init(struct net_device *dev)
2042 {
2043         struct dsa_port *dp = dsa_slave_to_port(dev);
2044         struct dsa_switch *ds = dp->ds;
2045         int port = dp->index;
2046         int err;
2047
2048         if (ds->ops->port_get_default_prio) {
2049                 int prio = ds->ops->port_get_default_prio(ds, port);
2050                 struct dcb_app app = {
2051                         .selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE,
2052                         .protocol = 0,
2053                         .priority = prio,
2054                 };
2055
2056                 if (prio < 0)
2057                         return prio;
2058
2059                 err = dcb_ieee_setapp(dev, &app);
2060                 if (err)
2061                         return err;
2062         }
2063
2064         if (ds->ops->port_get_dscp_prio) {
2065                 int protocol;
2066
2067                 for (protocol = 0; protocol < 64; protocol++) {
2068                         struct dcb_app app = {
2069                                 .selector = IEEE_8021QAZ_APP_SEL_DSCP,
2070                                 .protocol = protocol,
2071                         };
2072                         int prio;
2073
2074                         prio = ds->ops->port_get_dscp_prio(ds, port, protocol);
2075                         if (prio == -EOPNOTSUPP)
2076                                 continue;
2077                         if (prio < 0)
2078                                 return prio;
2079
2080                         app.priority = prio;
2081
2082                         err = dcb_ieee_setapp(dev, &app);
2083                         if (err)
2084                                 return err;
2085                 }
2086         }
2087
2088         return 0;
2089 }
2090
2091 static const struct ethtool_ops dsa_slave_ethtool_ops = {
2092         .get_drvinfo            = dsa_slave_get_drvinfo,
2093         .get_regs_len           = dsa_slave_get_regs_len,
2094         .get_regs               = dsa_slave_get_regs,
2095         .nway_reset             = dsa_slave_nway_reset,
2096         .get_link               = ethtool_op_get_link,
2097         .get_eeprom_len         = dsa_slave_get_eeprom_len,
2098         .get_eeprom             = dsa_slave_get_eeprom,
2099         .set_eeprom             = dsa_slave_set_eeprom,
2100         .get_strings            = dsa_slave_get_strings,
2101         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
2102         .get_sset_count         = dsa_slave_get_sset_count,
2103         .get_eth_phy_stats      = dsa_slave_get_eth_phy_stats,
2104         .get_eth_mac_stats      = dsa_slave_get_eth_mac_stats,
2105         .get_eth_ctrl_stats     = dsa_slave_get_eth_ctrl_stats,
2106         .get_rmon_stats         = dsa_slave_get_rmon_stats,
2107         .set_wol                = dsa_slave_set_wol,
2108         .get_wol                = dsa_slave_get_wol,
2109         .set_eee                = dsa_slave_set_eee,
2110         .get_eee                = dsa_slave_get_eee,
2111         .get_link_ksettings     = dsa_slave_get_link_ksettings,
2112         .set_link_ksettings     = dsa_slave_set_link_ksettings,
2113         .get_pause_stats        = dsa_slave_get_pause_stats,
2114         .get_pauseparam         = dsa_slave_get_pauseparam,
2115         .set_pauseparam         = dsa_slave_set_pauseparam,
2116         .get_rxnfc              = dsa_slave_get_rxnfc,
2117         .set_rxnfc              = dsa_slave_set_rxnfc,
2118         .get_ts_info            = dsa_slave_get_ts_info,
2119         .self_test              = dsa_slave_net_selftest,
2120 };
2121
2122 static const struct dcbnl_rtnl_ops __maybe_unused dsa_slave_dcbnl_ops = {
2123         .ieee_setapp            = dsa_slave_dcbnl_ieee_setapp,
2124         .ieee_delapp            = dsa_slave_dcbnl_ieee_delapp,
2125 };
2126
2127 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
2128 {
2129         struct dsa_port *dp = dsa_slave_to_port(dev);
2130
2131         return &dp->devlink_port;
2132 }
2133
2134 static void dsa_slave_get_stats64(struct net_device *dev,
2135                                   struct rtnl_link_stats64 *s)
2136 {
2137         struct dsa_port *dp = dsa_slave_to_port(dev);
2138         struct dsa_switch *ds = dp->ds;
2139
2140         if (ds->ops->get_stats64)
2141                 ds->ops->get_stats64(ds, dp->index, s);
2142         else
2143                 dev_get_tstats64(dev, s);
2144 }
2145
2146 static int dsa_slave_fill_forward_path(struct net_device_path_ctx *ctx,
2147                                        struct net_device_path *path)
2148 {
2149         struct dsa_port *dp = dsa_slave_to_port(ctx->dev);
2150         struct dsa_port *cpu_dp = dp->cpu_dp;
2151
2152         path->dev = ctx->dev;
2153         path->type = DEV_PATH_DSA;
2154         path->dsa.proto = cpu_dp->tag_ops->proto;
2155         path->dsa.port = dp->index;
2156         ctx->dev = cpu_dp->master;
2157
2158         return 0;
2159 }
2160
2161 static const struct net_device_ops dsa_slave_netdev_ops = {
2162         .ndo_open               = dsa_slave_open,
2163         .ndo_stop               = dsa_slave_close,
2164         .ndo_start_xmit         = dsa_slave_xmit,
2165         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
2166         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
2167         .ndo_set_mac_address    = dsa_slave_set_mac_address,
2168         .ndo_fdb_dump           = dsa_slave_fdb_dump,
2169         .ndo_eth_ioctl          = dsa_slave_ioctl,
2170         .ndo_get_iflink         = dsa_slave_get_iflink,
2171 #ifdef CONFIG_NET_POLL_CONTROLLER
2172         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
2173         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
2174         .ndo_poll_controller    = dsa_slave_poll_controller,
2175 #endif
2176         .ndo_setup_tc           = dsa_slave_setup_tc,
2177         .ndo_get_stats64        = dsa_slave_get_stats64,
2178         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
2179         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
2180         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
2181         .ndo_change_mtu         = dsa_slave_change_mtu,
2182         .ndo_fill_forward_path  = dsa_slave_fill_forward_path,
2183 };
2184
2185 static struct device_type dsa_type = {
2186         .name   = "dsa",
2187 };
2188
2189 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
2190 {
2191         const struct dsa_port *dp = dsa_to_port(ds, port);
2192
2193         if (dp->pl)
2194                 phylink_mac_change(dp->pl, up);
2195 }
2196 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
2197
2198 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
2199                                           struct phylink_link_state *state)
2200 {
2201         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
2202         struct dsa_switch *ds = dp->ds;
2203
2204         /* No need to check that this operation is valid, the callback would
2205          * not be called if it was not.
2206          */
2207         ds->ops->phylink_fixed_state(ds, dp->index, state);
2208 }
2209
2210 /* slave device setup *******************************************************/
2211 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr,
2212                                  u32 flags)
2213 {
2214         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2215         struct dsa_switch *ds = dp->ds;
2216
2217         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
2218         if (!slave_dev->phydev) {
2219                 netdev_err(slave_dev, "no phy at %d\n", addr);
2220                 return -ENODEV;
2221         }
2222
2223         slave_dev->phydev->dev_flags |= flags;
2224
2225         return phylink_connect_phy(dp->pl, slave_dev->phydev);
2226 }
2227
2228 static int dsa_slave_phy_setup(struct net_device *slave_dev)
2229 {
2230         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2231         struct device_node *port_dn = dp->dn;
2232         struct dsa_switch *ds = dp->ds;
2233         u32 phy_flags = 0;
2234         int ret;
2235
2236         dp->pl_config.dev = &slave_dev->dev;
2237         dp->pl_config.type = PHYLINK_NETDEV;
2238
2239         /* The get_fixed_state callback takes precedence over polling the
2240          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
2241          * this if the switch provides such a callback.
2242          */
2243         if (ds->ops->phylink_fixed_state) {
2244                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
2245                 dp->pl_config.poll_fixed_state = true;
2246         }
2247
2248         ret = dsa_port_phylink_create(dp);
2249         if (ret)
2250                 return ret;
2251
2252         if (ds->ops->get_phy_flags)
2253                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
2254
2255         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
2256         if (ret == -ENODEV && ds->slave_mii_bus) {
2257                 /* We could not connect to a designated PHY or SFP, so try to
2258                  * use the switch internal MDIO bus instead
2259                  */
2260                 ret = dsa_slave_phy_connect(slave_dev, dp->index, phy_flags);
2261         }
2262         if (ret) {
2263                 netdev_err(slave_dev, "failed to connect to PHY: %pe\n",
2264                            ERR_PTR(ret));
2265                 phylink_destroy(dp->pl);
2266         }
2267
2268         return ret;
2269 }
2270
2271 void dsa_slave_setup_tagger(struct net_device *slave)
2272 {
2273         struct dsa_port *dp = dsa_slave_to_port(slave);
2274         struct dsa_slave_priv *p = netdev_priv(slave);
2275         const struct dsa_port *cpu_dp = dp->cpu_dp;
2276         struct net_device *master = cpu_dp->master;
2277         const struct dsa_switch *ds = dp->ds;
2278
2279         slave->needed_headroom = cpu_dp->tag_ops->needed_headroom;
2280         slave->needed_tailroom = cpu_dp->tag_ops->needed_tailroom;
2281         /* Try to save one extra realloc later in the TX path (in the master)
2282          * by also inheriting the master's needed headroom and tailroom.
2283          * The 8021q driver also does this.
2284          */
2285         slave->needed_headroom += master->needed_headroom;
2286         slave->needed_tailroom += master->needed_tailroom;
2287
2288         p->xmit = cpu_dp->tag_ops->xmit;
2289
2290         slave->features = master->vlan_features | NETIF_F_HW_TC;
2291         slave->hw_features |= NETIF_F_HW_TC;
2292         slave->features |= NETIF_F_LLTX;
2293         if (slave->needed_tailroom)
2294                 slave->features &= ~(NETIF_F_SG | NETIF_F_FRAGLIST);
2295         if (ds->needs_standalone_vlan_filtering)
2296                 slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2297 }
2298
2299 int dsa_slave_suspend(struct net_device *slave_dev)
2300 {
2301         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2302
2303         if (!netif_running(slave_dev))
2304                 return 0;
2305
2306         netif_device_detach(slave_dev);
2307
2308         rtnl_lock();
2309         phylink_stop(dp->pl);
2310         rtnl_unlock();
2311
2312         return 0;
2313 }
2314
2315 int dsa_slave_resume(struct net_device *slave_dev)
2316 {
2317         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2318
2319         if (!netif_running(slave_dev))
2320                 return 0;
2321
2322         netif_device_attach(slave_dev);
2323
2324         rtnl_lock();
2325         phylink_start(dp->pl);
2326         rtnl_unlock();
2327
2328         return 0;
2329 }
2330
2331 int dsa_slave_create(struct dsa_port *port)
2332 {
2333         const struct dsa_port *cpu_dp = port->cpu_dp;
2334         struct net_device *master = cpu_dp->master;
2335         struct dsa_switch *ds = port->ds;
2336         const char *name = port->name;
2337         struct net_device *slave_dev;
2338         struct dsa_slave_priv *p;
2339         int ret;
2340
2341         if (!ds->num_tx_queues)
2342                 ds->num_tx_queues = 1;
2343
2344         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
2345                                      NET_NAME_UNKNOWN, ether_setup,
2346                                      ds->num_tx_queues, 1);
2347         if (slave_dev == NULL)
2348                 return -ENOMEM;
2349
2350         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
2351 #if IS_ENABLED(CONFIG_DCB)
2352         slave_dev->dcbnl_ops = &dsa_slave_dcbnl_ops;
2353 #endif
2354         if (!is_zero_ether_addr(port->mac))
2355                 eth_hw_addr_set(slave_dev, port->mac);
2356         else
2357                 eth_hw_addr_inherit(slave_dev, master);
2358         slave_dev->priv_flags |= IFF_NO_QUEUE;
2359         if (dsa_switch_supports_uc_filtering(ds))
2360                 slave_dev->priv_flags |= IFF_UNICAST_FLT;
2361         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
2362         if (ds->ops->port_max_mtu)
2363                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
2364         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
2365
2366         SET_NETDEV_DEV(slave_dev, port->ds->dev);
2367         slave_dev->dev.of_node = port->dn;
2368         slave_dev->vlan_features = master->vlan_features;
2369
2370         p = netdev_priv(slave_dev);
2371         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2372         if (!slave_dev->tstats) {
2373                 free_netdev(slave_dev);
2374                 return -ENOMEM;
2375         }
2376
2377         ret = gro_cells_init(&p->gcells, slave_dev);
2378         if (ret)
2379                 goto out_free;
2380
2381         p->dp = port;
2382         INIT_LIST_HEAD(&p->mall_tc_list);
2383         port->slave = slave_dev;
2384         dsa_slave_setup_tagger(slave_dev);
2385
2386         netif_carrier_off(slave_dev);
2387
2388         ret = dsa_slave_phy_setup(slave_dev);
2389         if (ret) {
2390                 netdev_err(slave_dev,
2391                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
2392                            ret, ds->dst->index, ds->index, port->index);
2393                 goto out_gcells;
2394         }
2395
2396         rtnl_lock();
2397
2398         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
2399         if (ret && ret != -EOPNOTSUPP)
2400                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
2401                          ret, ETH_DATA_LEN, port->index);
2402
2403         ret = register_netdevice(slave_dev);
2404         if (ret) {
2405                 netdev_err(master, "error %d registering interface %s\n",
2406                            ret, slave_dev->name);
2407                 rtnl_unlock();
2408                 goto out_phy;
2409         }
2410
2411         if (IS_ENABLED(CONFIG_DCB)) {
2412                 ret = dsa_slave_dcbnl_init(slave_dev);
2413                 if (ret) {
2414                         netdev_err(slave_dev,
2415                                    "failed to initialize DCB: %pe\n",
2416                                    ERR_PTR(ret));
2417                         rtnl_unlock();
2418                         goto out_unregister;
2419                 }
2420         }
2421
2422         ret = netdev_upper_dev_link(master, slave_dev, NULL);
2423
2424         rtnl_unlock();
2425
2426         if (ret)
2427                 goto out_unregister;
2428
2429         return 0;
2430
2431 out_unregister:
2432         unregister_netdev(slave_dev);
2433 out_phy:
2434         rtnl_lock();
2435         phylink_disconnect_phy(p->dp->pl);
2436         rtnl_unlock();
2437         phylink_destroy(p->dp->pl);
2438 out_gcells:
2439         gro_cells_destroy(&p->gcells);
2440 out_free:
2441         free_percpu(slave_dev->tstats);
2442         free_netdev(slave_dev);
2443         port->slave = NULL;
2444         return ret;
2445 }
2446
2447 void dsa_slave_destroy(struct net_device *slave_dev)
2448 {
2449         struct net_device *master = dsa_slave_to_master(slave_dev);
2450         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2451         struct dsa_slave_priv *p = netdev_priv(slave_dev);
2452
2453         netif_carrier_off(slave_dev);
2454         rtnl_lock();
2455         netdev_upper_dev_unlink(master, slave_dev);
2456         unregister_netdevice(slave_dev);
2457         phylink_disconnect_phy(dp->pl);
2458         rtnl_unlock();
2459
2460         phylink_destroy(dp->pl);
2461         gro_cells_destroy(&p->gcells);
2462         free_percpu(slave_dev->tstats);
2463         free_netdev(slave_dev);
2464 }
2465
2466 bool dsa_slave_dev_check(const struct net_device *dev)
2467 {
2468         return dev->netdev_ops == &dsa_slave_netdev_ops;
2469 }
2470 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
2471
2472 static int dsa_slave_changeupper(struct net_device *dev,
2473                                  struct netdev_notifier_changeupper_info *info)
2474 {
2475         struct dsa_port *dp = dsa_slave_to_port(dev);
2476         struct netlink_ext_ack *extack;
2477         int err = NOTIFY_DONE;
2478
2479         if (!dsa_slave_dev_check(dev))
2480                 return err;
2481
2482         extack = netdev_notifier_info_to_extack(&info->info);
2483
2484         if (netif_is_bridge_master(info->upper_dev)) {
2485                 if (info->linking) {
2486                         err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2487                         if (!err)
2488                                 dsa_bridge_mtu_normalization(dp);
2489                         if (err == -EOPNOTSUPP) {
2490                                 if (extack && !extack->_msg)
2491                                         NL_SET_ERR_MSG_MOD(extack,
2492                                                            "Offloading not supported");
2493                                 err = 0;
2494                         }
2495                         err = notifier_from_errno(err);
2496                 } else {
2497                         dsa_port_bridge_leave(dp, info->upper_dev);
2498                         err = NOTIFY_OK;
2499                 }
2500         } else if (netif_is_lag_master(info->upper_dev)) {
2501                 if (info->linking) {
2502                         err = dsa_port_lag_join(dp, info->upper_dev,
2503                                                 info->upper_info, extack);
2504                         if (err == -EOPNOTSUPP) {
2505                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2506                                                    "Offloading not supported");
2507                                 err = 0;
2508                         }
2509                         err = notifier_from_errno(err);
2510                 } else {
2511                         dsa_port_lag_leave(dp, info->upper_dev);
2512                         err = NOTIFY_OK;
2513                 }
2514         } else if (is_hsr_master(info->upper_dev)) {
2515                 if (info->linking) {
2516                         err = dsa_port_hsr_join(dp, info->upper_dev);
2517                         if (err == -EOPNOTSUPP) {
2518                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2519                                                    "Offloading not supported");
2520                                 err = 0;
2521                         }
2522                         err = notifier_from_errno(err);
2523                 } else {
2524                         dsa_port_hsr_leave(dp, info->upper_dev);
2525                         err = NOTIFY_OK;
2526                 }
2527         }
2528
2529         return err;
2530 }
2531
2532 static int dsa_slave_prechangeupper(struct net_device *dev,
2533                                     struct netdev_notifier_changeupper_info *info)
2534 {
2535         struct dsa_port *dp = dsa_slave_to_port(dev);
2536
2537         if (!dsa_slave_dev_check(dev))
2538                 return NOTIFY_DONE;
2539
2540         if (netif_is_bridge_master(info->upper_dev) && !info->linking)
2541                 dsa_port_pre_bridge_leave(dp, info->upper_dev);
2542         else if (netif_is_lag_master(info->upper_dev) && !info->linking)
2543                 dsa_port_pre_lag_leave(dp, info->upper_dev);
2544         /* dsa_port_pre_hsr_leave is not yet necessary since hsr cannot be
2545          * meaningfully enslaved to a bridge yet
2546          */
2547
2548         return NOTIFY_DONE;
2549 }
2550
2551 static int
2552 dsa_slave_lag_changeupper(struct net_device *dev,
2553                           struct netdev_notifier_changeupper_info *info)
2554 {
2555         struct net_device *lower;
2556         struct list_head *iter;
2557         int err = NOTIFY_DONE;
2558         struct dsa_port *dp;
2559
2560         if (!netif_is_lag_master(dev))
2561                 return err;
2562
2563         netdev_for_each_lower_dev(dev, lower, iter) {
2564                 if (!dsa_slave_dev_check(lower))
2565                         continue;
2566
2567                 dp = dsa_slave_to_port(lower);
2568                 if (!dp->lag)
2569                         /* Software LAG */
2570                         continue;
2571
2572                 err = dsa_slave_changeupper(lower, info);
2573                 if (notifier_to_errno(err))
2574                         break;
2575         }
2576
2577         return err;
2578 }
2579
2580 /* Same as dsa_slave_lag_changeupper() except that it calls
2581  * dsa_slave_prechangeupper()
2582  */
2583 static int
2584 dsa_slave_lag_prechangeupper(struct net_device *dev,
2585                              struct netdev_notifier_changeupper_info *info)
2586 {
2587         struct net_device *lower;
2588         struct list_head *iter;
2589         int err = NOTIFY_DONE;
2590         struct dsa_port *dp;
2591
2592         if (!netif_is_lag_master(dev))
2593                 return err;
2594
2595         netdev_for_each_lower_dev(dev, lower, iter) {
2596                 if (!dsa_slave_dev_check(lower))
2597                         continue;
2598
2599                 dp = dsa_slave_to_port(lower);
2600                 if (!dp->lag)
2601                         /* Software LAG */
2602                         continue;
2603
2604                 err = dsa_slave_prechangeupper(lower, info);
2605                 if (notifier_to_errno(err))
2606                         break;
2607         }
2608
2609         return err;
2610 }
2611
2612 static int
2613 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2614                                  struct netdev_notifier_changeupper_info *info)
2615 {
2616         struct netlink_ext_ack *ext_ack;
2617         struct net_device *slave, *br;
2618         struct dsa_port *dp;
2619
2620         ext_ack = netdev_notifier_info_to_extack(&info->info);
2621
2622         if (!is_vlan_dev(dev))
2623                 return NOTIFY_DONE;
2624
2625         slave = vlan_dev_real_dev(dev);
2626         if (!dsa_slave_dev_check(slave))
2627                 return NOTIFY_DONE;
2628
2629         dp = dsa_slave_to_port(slave);
2630         br = dsa_port_bridge_dev_get(dp);
2631         if (!br)
2632                 return NOTIFY_DONE;
2633
2634         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2635         if (br_vlan_enabled(br) &&
2636             netif_is_bridge_master(info->upper_dev) && info->linking) {
2637                 NL_SET_ERR_MSG_MOD(ext_ack,
2638                                    "Cannot enslave VLAN device into VLAN aware bridge");
2639                 return notifier_from_errno(-EINVAL);
2640         }
2641
2642         return NOTIFY_DONE;
2643 }
2644
2645 static int
2646 dsa_slave_check_8021q_upper(struct net_device *dev,
2647                             struct netdev_notifier_changeupper_info *info)
2648 {
2649         struct dsa_port *dp = dsa_slave_to_port(dev);
2650         struct net_device *br = dsa_port_bridge_dev_get(dp);
2651         struct bridge_vlan_info br_info;
2652         struct netlink_ext_ack *extack;
2653         int err = NOTIFY_DONE;
2654         u16 vid;
2655
2656         if (!br || !br_vlan_enabled(br))
2657                 return NOTIFY_DONE;
2658
2659         extack = netdev_notifier_info_to_extack(&info->info);
2660         vid = vlan_dev_vlan_id(info->upper_dev);
2661
2662         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2663          * device, respectively the VID is not found, returning
2664          * 0 means success, which is a failure for us here.
2665          */
2666         err = br_vlan_get_info(br, vid, &br_info);
2667         if (err == 0) {
2668                 NL_SET_ERR_MSG_MOD(extack,
2669                                    "This VLAN is already configured by the bridge");
2670                 return notifier_from_errno(-EBUSY);
2671         }
2672
2673         return NOTIFY_DONE;
2674 }
2675
2676 static int
2677 dsa_slave_prechangeupper_sanity_check(struct net_device *dev,
2678                                       struct netdev_notifier_changeupper_info *info)
2679 {
2680         struct dsa_switch *ds;
2681         struct dsa_port *dp;
2682         int err;
2683
2684         if (!dsa_slave_dev_check(dev))
2685                 return dsa_prevent_bridging_8021q_upper(dev, info);
2686
2687         dp = dsa_slave_to_port(dev);
2688         ds = dp->ds;
2689
2690         if (ds->ops->port_prechangeupper) {
2691                 err = ds->ops->port_prechangeupper(ds, dp->index, info);
2692                 if (err)
2693                         return notifier_from_errno(err);
2694         }
2695
2696         if (is_vlan_dev(info->upper_dev))
2697                 return dsa_slave_check_8021q_upper(dev, info);
2698
2699         return NOTIFY_DONE;
2700 }
2701
2702 static int
2703 dsa_master_prechangeupper_sanity_check(struct net_device *master,
2704                                        struct netdev_notifier_changeupper_info *info)
2705 {
2706         struct netlink_ext_ack *extack;
2707
2708         if (!netdev_uses_dsa(master))
2709                 return NOTIFY_DONE;
2710
2711         if (!info->linking)
2712                 return NOTIFY_DONE;
2713
2714         /* Allow DSA switch uppers */
2715         if (dsa_slave_dev_check(info->upper_dev))
2716                 return NOTIFY_DONE;
2717
2718         /* Allow bridge uppers of DSA masters, subject to further
2719          * restrictions in dsa_bridge_prechangelower_sanity_check()
2720          */
2721         if (netif_is_bridge_master(info->upper_dev))
2722                 return NOTIFY_DONE;
2723
2724         extack = netdev_notifier_info_to_extack(&info->info);
2725
2726         NL_SET_ERR_MSG_MOD(extack,
2727                            "DSA master cannot join unknown upper interfaces");
2728         return notifier_from_errno(-EBUSY);
2729 }
2730
2731 /* Don't allow bridging of DSA masters, since the bridge layer rx_handler
2732  * prevents the DSA fake ethertype handler to be invoked, so we don't get the
2733  * chance to strip off and parse the DSA switch tag protocol header (the bridge
2734  * layer just returns RX_HANDLER_CONSUMED, stopping RX processing for these
2735  * frames).
2736  * The only case where that would not be an issue is when bridging can already
2737  * be offloaded, such as when the DSA master is itself a DSA or plain switchdev
2738  * port, and is bridged only with other ports from the same hardware device.
2739  */
2740 static int
2741 dsa_bridge_prechangelower_sanity_check(struct net_device *new_lower,
2742                                        struct netdev_notifier_changeupper_info *info)
2743 {
2744         struct net_device *br = info->upper_dev;
2745         struct netlink_ext_ack *extack;
2746         struct net_device *lower;
2747         struct list_head *iter;
2748
2749         if (!netif_is_bridge_master(br))
2750                 return NOTIFY_DONE;
2751
2752         if (!info->linking)
2753                 return NOTIFY_DONE;
2754
2755         extack = netdev_notifier_info_to_extack(&info->info);
2756
2757         netdev_for_each_lower_dev(br, lower, iter) {
2758                 if (!netdev_uses_dsa(new_lower) && !netdev_uses_dsa(lower))
2759                         continue;
2760
2761                 if (!netdev_port_same_parent_id(lower, new_lower)) {
2762                         NL_SET_ERR_MSG(extack,
2763                                        "Cannot do software bridging with a DSA master");
2764                         return notifier_from_errno(-EINVAL);
2765                 }
2766         }
2767
2768         return NOTIFY_DONE;
2769 }
2770
2771 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2772                                      unsigned long event, void *ptr)
2773 {
2774         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2775
2776         switch (event) {
2777         case NETDEV_PRECHANGEUPPER: {
2778                 struct netdev_notifier_changeupper_info *info = ptr;
2779                 int err;
2780
2781                 err = dsa_slave_prechangeupper_sanity_check(dev, info);
2782                 if (notifier_to_errno(err))
2783                         return err;
2784
2785                 err = dsa_master_prechangeupper_sanity_check(dev, info);
2786                 if (notifier_to_errno(err))
2787                         return err;
2788
2789                 err = dsa_bridge_prechangelower_sanity_check(dev, info);
2790                 if (notifier_to_errno(err))
2791                         return err;
2792
2793                 err = dsa_slave_prechangeupper(dev, ptr);
2794                 if (notifier_to_errno(err))
2795                         return err;
2796
2797                 err = dsa_slave_lag_prechangeupper(dev, ptr);
2798                 if (notifier_to_errno(err))
2799                         return err;
2800
2801                 break;
2802         }
2803         case NETDEV_CHANGEUPPER: {
2804                 int err;
2805
2806                 err = dsa_slave_changeupper(dev, ptr);
2807                 if (notifier_to_errno(err))
2808                         return err;
2809
2810                 err = dsa_slave_lag_changeupper(dev, ptr);
2811                 if (notifier_to_errno(err))
2812                         return err;
2813
2814                 break;
2815         }
2816         case NETDEV_CHANGELOWERSTATE: {
2817                 struct netdev_notifier_changelowerstate_info *info = ptr;
2818                 struct dsa_port *dp;
2819                 int err;
2820
2821                 if (!dsa_slave_dev_check(dev))
2822                         break;
2823
2824                 dp = dsa_slave_to_port(dev);
2825
2826                 err = dsa_port_lag_change(dp, info->lower_state_info);
2827                 return notifier_from_errno(err);
2828         }
2829         case NETDEV_CHANGE:
2830         case NETDEV_UP: {
2831                 /* Track state of master port.
2832                  * DSA driver may require the master port (and indirectly
2833                  * the tagger) to be available for some special operation.
2834                  */
2835                 if (netdev_uses_dsa(dev)) {
2836                         struct dsa_port *cpu_dp = dev->dsa_ptr;
2837                         struct dsa_switch_tree *dst = cpu_dp->ds->dst;
2838
2839                         /* Track when the master port is UP */
2840                         dsa_tree_master_oper_state_change(dst, dev,
2841                                                           netif_oper_up(dev));
2842
2843                         /* Track when the master port is ready and can accept
2844                          * packet.
2845                          * NETDEV_UP event is not enough to flag a port as ready.
2846                          * We also have to wait for linkwatch_do_dev to dev_activate
2847                          * and emit a NETDEV_CHANGE event.
2848                          * We check if a master port is ready by checking if the dev
2849                          * have a qdisc assigned and is not noop.
2850                          */
2851                         dsa_tree_master_admin_state_change(dst, dev,
2852                                                            !qdisc_tx_is_noop(dev));
2853
2854                         return NOTIFY_OK;
2855                 }
2856
2857                 return NOTIFY_DONE;
2858         }
2859         case NETDEV_GOING_DOWN: {
2860                 struct dsa_port *dp, *cpu_dp;
2861                 struct dsa_switch_tree *dst;
2862                 LIST_HEAD(close_list);
2863
2864                 if (!netdev_uses_dsa(dev))
2865                         return NOTIFY_DONE;
2866
2867                 cpu_dp = dev->dsa_ptr;
2868                 dst = cpu_dp->ds->dst;
2869
2870                 dsa_tree_master_admin_state_change(dst, dev, false);
2871
2872                 list_for_each_entry(dp, &dst->ports, list) {
2873                         if (!dsa_port_is_user(dp))
2874                                 continue;
2875
2876                         if (dp->cpu_dp != cpu_dp)
2877                                 continue;
2878
2879                         list_add(&dp->slave->close_list, &close_list);
2880                 }
2881
2882                 dev_close_many(&close_list, true);
2883
2884                 return NOTIFY_OK;
2885         }
2886         default:
2887                 break;
2888         }
2889
2890         return NOTIFY_DONE;
2891 }
2892
2893 static void
2894 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2895 {
2896         struct switchdev_notifier_fdb_info info = {};
2897
2898         info.addr = switchdev_work->addr;
2899         info.vid = switchdev_work->vid;
2900         info.offloaded = true;
2901         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2902                                  switchdev_work->orig_dev, &info.info, NULL);
2903 }
2904
2905 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2906 {
2907         struct dsa_switchdev_event_work *switchdev_work =
2908                 container_of(work, struct dsa_switchdev_event_work, work);
2909         const unsigned char *addr = switchdev_work->addr;
2910         struct net_device *dev = switchdev_work->dev;
2911         u16 vid = switchdev_work->vid;
2912         struct dsa_switch *ds;
2913         struct dsa_port *dp;
2914         int err;
2915
2916         dp = dsa_slave_to_port(dev);
2917         ds = dp->ds;
2918
2919         switch (switchdev_work->event) {
2920         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2921                 if (switchdev_work->host_addr)
2922                         err = dsa_port_bridge_host_fdb_add(dp, addr, vid);
2923                 else if (dp->lag)
2924                         err = dsa_port_lag_fdb_add(dp, addr, vid);
2925                 else
2926                         err = dsa_port_fdb_add(dp, addr, vid);
2927                 if (err) {
2928                         dev_err(ds->dev,
2929                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2930                                 dp->index, addr, vid, err);
2931                         break;
2932                 }
2933                 dsa_fdb_offload_notify(switchdev_work);
2934                 break;
2935
2936         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2937                 if (switchdev_work->host_addr)
2938                         err = dsa_port_bridge_host_fdb_del(dp, addr, vid);
2939                 else if (dp->lag)
2940                         err = dsa_port_lag_fdb_del(dp, addr, vid);
2941                 else
2942                         err = dsa_port_fdb_del(dp, addr, vid);
2943                 if (err) {
2944                         dev_err(ds->dev,
2945                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2946                                 dp->index, addr, vid, err);
2947                 }
2948
2949                 break;
2950         }
2951
2952         kfree(switchdev_work);
2953 }
2954
2955 static bool dsa_foreign_dev_check(const struct net_device *dev,
2956                                   const struct net_device *foreign_dev)
2957 {
2958         const struct dsa_port *dp = dsa_slave_to_port(dev);
2959         struct dsa_switch_tree *dst = dp->ds->dst;
2960
2961         if (netif_is_bridge_master(foreign_dev))
2962                 return !dsa_tree_offloads_bridge_dev(dst, foreign_dev);
2963
2964         if (netif_is_bridge_port(foreign_dev))
2965                 return !dsa_tree_offloads_bridge_port(dst, foreign_dev);
2966
2967         /* Everything else is foreign */
2968         return true;
2969 }
2970
2971 static int dsa_slave_fdb_event(struct net_device *dev,
2972                                struct net_device *orig_dev,
2973                                unsigned long event, const void *ctx,
2974                                const struct switchdev_notifier_fdb_info *fdb_info)
2975 {
2976         struct dsa_switchdev_event_work *switchdev_work;
2977         struct dsa_port *dp = dsa_slave_to_port(dev);
2978         bool host_addr = fdb_info->is_local;
2979         struct dsa_switch *ds = dp->ds;
2980
2981         if (ctx && ctx != dp)
2982                 return 0;
2983
2984         if (!dp->bridge)
2985                 return 0;
2986
2987         if (switchdev_fdb_is_dynamically_learned(fdb_info)) {
2988                 if (dsa_port_offloads_bridge_port(dp, orig_dev))
2989                         return 0;
2990
2991                 /* FDB entries learned by the software bridge or by foreign
2992                  * bridge ports should be installed as host addresses only if
2993                  * the driver requests assisted learning.
2994                  */
2995                 if (!ds->assisted_learning_on_cpu_port)
2996                         return 0;
2997         }
2998
2999         /* Also treat FDB entries on foreign interfaces bridged with us as host
3000          * addresses.
3001          */
3002         if (dsa_foreign_dev_check(dev, orig_dev))
3003                 host_addr = true;
3004
3005         /* Check early that we're not doing work in vain.
3006          * Host addresses on LAG ports still require regular FDB ops,
3007          * since the CPU port isn't in a LAG.
3008          */
3009         if (dp->lag && !host_addr) {
3010                 if (!ds->ops->lag_fdb_add || !ds->ops->lag_fdb_del)
3011                         return -EOPNOTSUPP;
3012         } else {
3013                 if (!ds->ops->port_fdb_add || !ds->ops->port_fdb_del)
3014                         return -EOPNOTSUPP;
3015         }
3016
3017         switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
3018         if (!switchdev_work)
3019                 return -ENOMEM;
3020
3021         netdev_dbg(dev, "%s FDB entry towards %s, addr %pM vid %d%s\n",
3022                    event == SWITCHDEV_FDB_ADD_TO_DEVICE ? "Adding" : "Deleting",
3023                    orig_dev->name, fdb_info->addr, fdb_info->vid,
3024                    host_addr ? " as host address" : "");
3025
3026         INIT_WORK(&switchdev_work->work, dsa_slave_switchdev_event_work);
3027         switchdev_work->event = event;
3028         switchdev_work->dev = dev;
3029         switchdev_work->orig_dev = orig_dev;
3030
3031         ether_addr_copy(switchdev_work->addr, fdb_info->addr);
3032         switchdev_work->vid = fdb_info->vid;
3033         switchdev_work->host_addr = host_addr;
3034
3035         dsa_schedule_work(&switchdev_work->work);
3036
3037         return 0;
3038 }
3039
3040 /* Called under rcu_read_lock() */
3041 static int dsa_slave_switchdev_event(struct notifier_block *unused,
3042                                      unsigned long event, void *ptr)
3043 {
3044         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3045         int err;
3046
3047         switch (event) {
3048         case SWITCHDEV_PORT_ATTR_SET:
3049                 err = switchdev_handle_port_attr_set(dev, ptr,
3050                                                      dsa_slave_dev_check,
3051                                                      dsa_slave_port_attr_set);
3052                 return notifier_from_errno(err);
3053         case SWITCHDEV_FDB_ADD_TO_DEVICE:
3054         case SWITCHDEV_FDB_DEL_TO_DEVICE:
3055                 err = switchdev_handle_fdb_event_to_device(dev, event, ptr,
3056                                                            dsa_slave_dev_check,
3057                                                            dsa_foreign_dev_check,
3058                                                            dsa_slave_fdb_event);
3059                 return notifier_from_errno(err);
3060         default:
3061                 return NOTIFY_DONE;
3062         }
3063
3064         return NOTIFY_OK;
3065 }
3066
3067 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
3068                                               unsigned long event, void *ptr)
3069 {
3070         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3071         int err;
3072
3073         switch (event) {
3074         case SWITCHDEV_PORT_OBJ_ADD:
3075                 err = switchdev_handle_port_obj_add_foreign(dev, ptr,
3076                                                             dsa_slave_dev_check,
3077                                                             dsa_foreign_dev_check,
3078                                                             dsa_slave_port_obj_add);
3079                 return notifier_from_errno(err);
3080         case SWITCHDEV_PORT_OBJ_DEL:
3081                 err = switchdev_handle_port_obj_del_foreign(dev, ptr,
3082                                                             dsa_slave_dev_check,
3083                                                             dsa_foreign_dev_check,
3084                                                             dsa_slave_port_obj_del);
3085                 return notifier_from_errno(err);
3086         case SWITCHDEV_PORT_ATTR_SET:
3087                 err = switchdev_handle_port_attr_set(dev, ptr,
3088                                                      dsa_slave_dev_check,
3089                                                      dsa_slave_port_attr_set);
3090                 return notifier_from_errno(err);
3091         }
3092
3093         return NOTIFY_DONE;
3094 }
3095
3096 static struct notifier_block dsa_slave_nb __read_mostly = {
3097         .notifier_call  = dsa_slave_netdevice_event,
3098 };
3099
3100 struct notifier_block dsa_slave_switchdev_notifier = {
3101         .notifier_call = dsa_slave_switchdev_event,
3102 };
3103
3104 struct notifier_block dsa_slave_switchdev_blocking_notifier = {
3105         .notifier_call = dsa_slave_switchdev_blocking_event,
3106 };
3107
3108 int dsa_slave_register_notifier(void)
3109 {
3110         struct notifier_block *nb;
3111         int err;
3112
3113         err = register_netdevice_notifier(&dsa_slave_nb);
3114         if (err)
3115                 return err;
3116
3117         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
3118         if (err)
3119                 goto err_switchdev_nb;
3120
3121         nb = &dsa_slave_switchdev_blocking_notifier;
3122         err = register_switchdev_blocking_notifier(nb);
3123         if (err)
3124                 goto err_switchdev_blocking_nb;
3125
3126         return 0;
3127
3128 err_switchdev_blocking_nb:
3129         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
3130 err_switchdev_nb:
3131         unregister_netdevice_notifier(&dsa_slave_nb);
3132         return err;
3133 }
3134
3135 void dsa_slave_unregister_notifier(void)
3136 {
3137         struct notifier_block *nb;
3138         int err;
3139
3140         nb = &dsa_slave_switchdev_blocking_notifier;
3141         err = unregister_switchdev_blocking_notifier(nb);
3142         if (err)
3143                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
3144
3145         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
3146         if (err)
3147                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
3148
3149         err = unregister_netdevice_notifier(&dsa_slave_nb);
3150         if (err)
3151                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
3152 }