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/tc_act/tc_mirred.h>
  19 #include <linux/if_bridge.h>
  20 #include <linux/netpoll.h>
  21 #include <linux/ptp_classify.h>
  22
  23 #include "dsa_priv.h"
  24
  25 /* slave mii_bus handling ***************************************************/
  26 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  27 {
  28         struct dsa_switch *ds = bus->priv;
  29
  30         if (ds->phys_mii_mask & (1 << addr))
  31                 return ds->ops->phy_read(ds, addr, reg);
  32
  33         return 0xffff;
  34 }
  35
  36 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  37 {
  38         struct dsa_switch *ds = bus->priv;
  39
  40         if (ds->phys_mii_mask & (1 << addr))
  41                 return ds->ops->phy_write(ds, addr, reg, val);
  42
  43         return 0;
  44 }
  45
  46 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  47 {
  48         ds->slave_mii_bus->priv = (void *)ds;
  49         ds->slave_mii_bus->name = "dsa slave smi";
  50         ds->slave_mii_bus->read = dsa_slave_phy_read;
  51         ds->slave_mii_bus->write = dsa_slave_phy_write;
  52         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  53                  ds->dst->index, ds->index);
  54         ds->slave_mii_bus->parent = ds->dev;
  55         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  56 }
  57
  58
  59 /* slave device handling ****************************************************/
  60 static int dsa_slave_get_iflink(const struct net_device *dev)
  61 {
  62         return dsa_slave_to_master(dev)->ifindex;
  63 }
  64
  65 static int dsa_slave_open(struct net_device *dev)
  66 {
  67         struct net_device *master = dsa_slave_to_master(dev);
  68         struct dsa_port *dp = dsa_slave_to_port(dev);
  69         int err;
  70
  71         if (!(master->flags & IFF_UP))
  72                 return -ENETDOWN;
  73
  74         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  75                 err = dev_uc_add(master, dev->dev_addr);
  76                 if (err < 0)
  77                         goto out;
  78         }
  79
  80         if (dev->flags & IFF_ALLMULTI) {
  81                 err = dev_set_allmulti(master, 1);
  82                 if (err < 0)
  83                         goto del_unicast;
  84         }
  85         if (dev->flags & IFF_PROMISC) {
  86                 err = dev_set_promiscuity(master, 1);
  87                 if (err < 0)
  88                         goto clear_allmulti;
  89         }
  90
  91         err = dsa_port_enable_rt(dp, dev->phydev);
  92         if (err)
  93                 goto clear_promisc;
  94
  95         return 0;
  96
  97 clear_promisc:
  98         if (dev->flags & IFF_PROMISC)
  99                 dev_set_promiscuity(master, -1);
 100 clear_allmulti:
 101         if (dev->flags & IFF_ALLMULTI)
 102                 dev_set_allmulti(master, -1);
 103 del_unicast:
 104         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 105                 dev_uc_del(master, dev->dev_addr);
 106 out:
 107         return err;
 108 }
 109
 110 static int dsa_slave_close(struct net_device *dev)
 111 {
 112         struct net_device *master = dsa_slave_to_master(dev);
 113         struct dsa_port *dp = dsa_slave_to_port(dev);
 114
 115         dsa_port_disable_rt(dp);
 116
 117         dev_mc_unsync(master, dev);
 118         dev_uc_unsync(master, dev);
 119         if (dev->flags & IFF_ALLMULTI)
 120                 dev_set_allmulti(master, -1);
 121         if (dev->flags & IFF_PROMISC)
 122                 dev_set_promiscuity(master, -1);
 123
 124         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 125                 dev_uc_del(master, dev->dev_addr);
 126
 127         return 0;
 128 }
 129
 130 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 131 {
 132         struct net_device *master = dsa_slave_to_master(dev);
 133         if (dev->flags & IFF_UP) {
 134                 if (change & IFF_ALLMULTI)
 135                         dev_set_allmulti(master,
 136                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 137                 if (change & IFF_PROMISC)
 138                         dev_set_promiscuity(master,
 139                                             dev->flags & IFF_PROMISC ? 1 : -1);
 140         }
 141 }
 142
 143 static void dsa_slave_set_rx_mode(struct net_device *dev)
 144 {
 145         struct net_device *master = dsa_slave_to_master(dev);
 146
 147         dev_mc_sync(master, dev);
 148         dev_uc_sync(master, dev);
 149 }
 150
 151 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 152 {
 153         struct net_device *master = dsa_slave_to_master(dev);
 154         struct sockaddr *addr = a;
 155         int err;
 156
 157         if (!is_valid_ether_addr(addr->sa_data))
 158                 return -EADDRNOTAVAIL;
 159
 160         if (!(dev->flags & IFF_UP))
 161                 goto out;
 162
 163         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 164                 err = dev_uc_add(master, addr->sa_data);
 165                 if (err < 0)
 166                         return err;
 167         }
 168
 169         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 170                 dev_uc_del(master, dev->dev_addr);
 171
 172 out:
 173         ether_addr_copy(dev->dev_addr, addr->sa_data);
 174
 175         return 0;
 176 }
 177
 178 struct dsa_slave_dump_ctx {
 179         struct net_device *dev;
 180         struct sk_buff *skb;
 181         struct netlink_callback *cb;
 182         int idx;
 183 };
 184
 185 static int
 186 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 187                            bool is_static, void *data)
 188 {
 189         struct dsa_slave_dump_ctx *dump = data;
 190         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 191         u32 seq = dump->cb->nlh->nlmsg_seq;
 192         struct nlmsghdr *nlh;
 193         struct ndmsg *ndm;
 194
 195         if (dump->idx < dump->cb->args[2])
 196                 goto skip;
 197
 198         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 199                         sizeof(*ndm), NLM_F_MULTI);
 200         if (!nlh)
 201                 return -EMSGSIZE;
 202
 203         ndm = nlmsg_data(nlh);
 204         ndm->ndm_family  = AF_BRIDGE;
 205         ndm->ndm_pad1    = 0;
 206         ndm->ndm_pad2    = 0;
 207         ndm->ndm_flags   = NTF_SELF;
 208         ndm->ndm_type    = 0;
 209         ndm->ndm_ifindex = dump->dev->ifindex;
 210         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 211
 212         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 213                 goto nla_put_failure;
 214
 215         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 216                 goto nla_put_failure;
 217
 218         nlmsg_end(dump->skb, nlh);
 219
 220 skip:
 221         dump->idx++;
 222         return 0;
 223
 224 nla_put_failure:
 225         nlmsg_cancel(dump->skb, nlh);
 226         return -EMSGSIZE;
 227 }
 228
 229 static int
 230 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 231                    struct net_device *dev, struct net_device *filter_dev,
 232                    int *idx)
 233 {
 234         struct dsa_port *dp = dsa_slave_to_port(dev);
 235         struct dsa_slave_dump_ctx dump = {
 236                 .dev = dev,
 237                 .skb = skb,
 238                 .cb = cb,
 239                 .idx = *idx,
 240         };
 241         int err;
 242
 243         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 244         *idx = dump.idx;
 245
 246         return err;
 247 }
 248
 249 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 250 {
 251         struct dsa_slave_priv *p = netdev_priv(dev);
 252         struct dsa_switch *ds = p->dp->ds;
 253         int port = p->dp->index;
 254
 255         /* Pass through to switch driver if it supports timestamping */
 256         switch (cmd) {
 257         case SIOCGHWTSTAMP:
 258                 if (ds->ops->port_hwtstamp_get)
 259                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 260                 break;
 261         case SIOCSHWTSTAMP:
 262                 if (ds->ops->port_hwtstamp_set)
 263                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 264                 break;
 265         }
 266
 267         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 268 }
 269
 270 static int dsa_slave_port_attr_set(struct net_device *dev,
 271                                    const struct switchdev_attr *attr)
 272 {
 273         struct dsa_port *dp = dsa_slave_to_port(dev);
 274         int ret;
 275
 276         if (!dsa_port_offloads_netdev(dp, attr->orig_dev))
 277                 return -EOPNOTSUPP;
 278
 279         switch (attr->id) {
 280         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 281                 ret = dsa_port_set_state(dp, attr->u.stp_state);
 282                 break;
 283         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 284                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering);
 285                 break;
 286         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 287                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 288                 break;
 289         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 290                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags);
 291                 break;
 292         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 293                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags);
 294                 break;
 295         case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 296                 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter);
 297                 break;
 298         default:
 299                 ret = -EOPNOTSUPP;
 300                 break;
 301         }
 302
 303         return ret;
 304 }
 305
 306 /* Must be called under rcu_read_lock() */
 307 static int
 308 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 309                                       const struct switchdev_obj_port_vlan *vlan)
 310 {
 311         struct net_device *upper_dev;
 312         struct list_head *iter;
 313
 314         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 315                 u16 vid;
 316
 317                 if (!is_vlan_dev(upper_dev))
 318                         continue;
 319
 320                 vid = vlan_dev_vlan_id(upper_dev);
 321                 if (vid == vlan->vid)
 322                         return -EBUSY;
 323         }
 324
 325         return 0;
 326 }
 327
 328 static int dsa_slave_vlan_add(struct net_device *dev,
 329                               const struct switchdev_obj *obj,
 330                               struct netlink_ext_ack *extack)
 331 {
 332         struct net_device *master = dsa_slave_to_master(dev);
 333         struct dsa_port *dp = dsa_slave_to_port(dev);
 334         struct switchdev_obj_port_vlan vlan;
 335         int err;
 336
 337         if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 338                 return -EOPNOTSUPP;
 339
 340         if (dsa_port_skip_vlan_configuration(dp)) {
 341                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 342                 return 0;
 343         }
 344
 345         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 346
 347         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 348          * the same VID.
 349          */
 350         if (br_vlan_enabled(dp->bridge_dev)) {
 351                 rcu_read_lock();
 352                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
 353                 rcu_read_unlock();
 354                 if (err)
 355                         return err;
 356         }
 357
 358         err = dsa_port_vlan_add(dp, &vlan);
 359         if (err)
 360                 return err;
 361
 362         /* We need the dedicated CPU port to be a member of the VLAN as well.
 363          * Even though drivers often handle CPU membership in special ways,
 364          * it doesn't make sense to program a PVID, so clear this flag.
 365          */
 366         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 367
 368         err = dsa_port_vlan_add(dp->cpu_dp, &vlan);
 369         if (err)
 370                 return err;
 371
 372         return vlan_vid_add(master, htons(ETH_P_8021Q), vlan.vid);
 373 }
 374
 375 static int dsa_slave_port_obj_add(struct net_device *dev,
 376                                   const struct switchdev_obj *obj,
 377                                   struct netlink_ext_ack *extack)
 378 {
 379         struct dsa_port *dp = dsa_slave_to_port(dev);
 380         int err;
 381
 382         switch (obj->id) {
 383         case SWITCHDEV_OBJ_ID_PORT_MDB:
 384                 if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 385                         return -EOPNOTSUPP;
 386                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 387                 break;
 388         case SWITCHDEV_OBJ_ID_HOST_MDB:
 389                 /* DSA can directly translate this to a normal MDB add,
 390                  * but on the CPU port.
 391                  */
 392                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 393                 break;
 394         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 395                 err = dsa_slave_vlan_add(dev, obj, extack);
 396                 break;
 397         default:
 398                 err = -EOPNOTSUPP;
 399                 break;
 400         }
 401
 402         return err;
 403 }
 404
 405 static int dsa_slave_vlan_del(struct net_device *dev,
 406                               const struct switchdev_obj *obj)
 407 {
 408         struct net_device *master = dsa_slave_to_master(dev);
 409         struct dsa_port *dp = dsa_slave_to_port(dev);
 410         struct switchdev_obj_port_vlan *vlan;
 411         int err;
 412
 413         if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 414                 return -EOPNOTSUPP;
 415
 416         if (dsa_port_skip_vlan_configuration(dp))
 417                 return 0;
 418
 419         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 420
 421         /* Do not deprogram the CPU port as it may be shared with other user
 422          * ports which can be members of this VLAN as well.
 423          */
 424         err = dsa_port_vlan_del(dp, vlan);
 425         if (err)
 426                 return err;
 427
 428         vlan_vid_del(master, htons(ETH_P_8021Q), vlan->vid);
 429
 430         return 0;
 431 }
 432
 433 static int dsa_slave_port_obj_del(struct net_device *dev,
 434                                   const struct switchdev_obj *obj)
 435 {
 436         struct dsa_port *dp = dsa_slave_to_port(dev);
 437         int err;
 438
 439         switch (obj->id) {
 440         case SWITCHDEV_OBJ_ID_PORT_MDB:
 441                 if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 442                         return -EOPNOTSUPP;
 443                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 444                 break;
 445         case SWITCHDEV_OBJ_ID_HOST_MDB:
 446                 /* DSA can directly translate this to a normal MDB add,
 447                  * but on the CPU port.
 448                  */
 449                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 450                 break;
 451         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 452                 err = dsa_slave_vlan_del(dev, obj);
 453                 break;
 454         default:
 455                 err = -EOPNOTSUPP;
 456                 break;
 457         }
 458
 459         return err;
 460 }
 461
 462 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 463                                         struct netdev_phys_item_id *ppid)
 464 {
 465         struct dsa_port *dp = dsa_slave_to_port(dev);
 466         struct dsa_switch *ds = dp->ds;
 467         struct dsa_switch_tree *dst = ds->dst;
 468
 469         /* For non-legacy ports, devlink is used and it takes
 470          * care of the name generation. This ndo implementation
 471          * should be removed with legacy support.
 472          */
 473         if (dp->ds->devlink)
 474                 return -EOPNOTSUPP;
 475
 476         ppid->id_len = sizeof(dst->index);
 477         memcpy(&ppid->id, &dst->index, ppid->id_len);
 478
 479         return 0;
 480 }
 481
 482 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 483                                                      struct sk_buff *skb)
 484 {
 485 #ifdef CONFIG_NET_POLL_CONTROLLER
 486         struct dsa_slave_priv *p = netdev_priv(dev);
 487
 488         return netpoll_send_skb(p->netpoll, skb);
 489 #else
 490         BUG();
 491         return NETDEV_TX_OK;
 492 #endif
 493 }
 494
 495 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 496                                  struct sk_buff *skb)
 497 {
 498         struct dsa_switch *ds = p->dp->ds;
 499         struct sk_buff *clone;
 500         unsigned int type;
 501
 502         type = ptp_classify_raw(skb);
 503         if (type == PTP_CLASS_NONE)
 504                 return;
 505
 506         if (!ds->ops->port_txtstamp)
 507                 return;
 508
 509         clone = skb_clone_sk(skb);
 510         if (!clone)
 511                 return;
 512
 513         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type)) {
 514                 DSA_SKB_CB(skb)->clone = clone;
 515                 return;
 516         }
 517
 518         kfree_skb(clone);
 519 }
 520
 521 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 522 {
 523         /* SKB for netpoll still need to be mangled with the protocol-specific
 524          * tag to be successfully transmitted
 525          */
 526         if (unlikely(netpoll_tx_running(dev)))
 527                 return dsa_slave_netpoll_send_skb(dev, skb);
 528
 529         /* Queue the SKB for transmission on the parent interface, but
 530          * do not modify its EtherType
 531          */
 532         skb->dev = dsa_slave_to_master(dev);
 533         dev_queue_xmit(skb);
 534
 535         return NETDEV_TX_OK;
 536 }
 537 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 538
 539 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 540 {
 541         int needed_headroom = dev->needed_headroom;
 542         int needed_tailroom = dev->needed_tailroom;
 543
 544         /* For tail taggers, we need to pad short frames ourselves, to ensure
 545          * that the tail tag does not fail at its role of being at the end of
 546          * the packet, once the master interface pads the frame. Account for
 547          * that pad length here, and pad later.
 548          */
 549         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 550                 needed_tailroom += ETH_ZLEN - skb->len;
 551         /* skb_headroom() returns unsigned int... */
 552         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 553         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 554
 555         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 556                 /* No reallocation needed, yay! */
 557                 return 0;
 558
 559         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 560                                 GFP_ATOMIC);
 561 }
 562
 563 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 564 {
 565         struct dsa_slave_priv *p = netdev_priv(dev);
 566         struct sk_buff *nskb;
 567
 568         dev_sw_netstats_tx_add(dev, 1, skb->len);
 569
 570         DSA_SKB_CB(skb)->clone = NULL;
 571
 572         /* Identify PTP protocol packets, clone them, and pass them to the
 573          * switch driver
 574          */
 575         dsa_skb_tx_timestamp(p, skb);
 576
 577         if (dsa_realloc_skb(skb, dev)) {
 578                 dev_kfree_skb_any(skb);
 579                 return NETDEV_TX_OK;
 580         }
 581
 582         /* needed_tailroom should still be 'warm' in the cache line from
 583          * dsa_realloc_skb(), which has also ensured that padding is safe.
 584          */
 585         if (dev->needed_tailroom)
 586                 eth_skb_pad(skb);
 587
 588         /* Transmit function may have to reallocate the original SKB,
 589          * in which case it must have freed it. Only free it here on error.
 590          */
 591         nskb = p->xmit(skb, dev);
 592         if (!nskb) {
 593                 kfree_skb(skb);
 594                 return NETDEV_TX_OK;
 595         }
 596
 597         return dsa_enqueue_skb(nskb, dev);
 598 }
 599
 600 /* ethtool operations *******************************************************/
 601
 602 static void dsa_slave_get_drvinfo(struct net_device *dev,
 603                                   struct ethtool_drvinfo *drvinfo)
 604 {
 605         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 606         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 607         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 608 }
 609
 610 static int dsa_slave_get_regs_len(struct net_device *dev)
 611 {
 612         struct dsa_port *dp = dsa_slave_to_port(dev);
 613         struct dsa_switch *ds = dp->ds;
 614
 615         if (ds->ops->get_regs_len)
 616                 return ds->ops->get_regs_len(ds, dp->index);
 617
 618         return -EOPNOTSUPP;
 619 }
 620
 621 static void
 622 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 623 {
 624         struct dsa_port *dp = dsa_slave_to_port(dev);
 625         struct dsa_switch *ds = dp->ds;
 626
 627         if (ds->ops->get_regs)
 628                 ds->ops->get_regs(ds, dp->index, regs, _p);
 629 }
 630
 631 static int dsa_slave_nway_reset(struct net_device *dev)
 632 {
 633         struct dsa_port *dp = dsa_slave_to_port(dev);
 634
 635         return phylink_ethtool_nway_reset(dp->pl);
 636 }
 637
 638 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 639 {
 640         struct dsa_port *dp = dsa_slave_to_port(dev);
 641         struct dsa_switch *ds = dp->ds;
 642
 643         if (ds->cd && ds->cd->eeprom_len)
 644                 return ds->cd->eeprom_len;
 645
 646         if (ds->ops->get_eeprom_len)
 647                 return ds->ops->get_eeprom_len(ds);
 648
 649         return 0;
 650 }
 651
 652 static int dsa_slave_get_eeprom(struct net_device *dev,
 653                                 struct ethtool_eeprom *eeprom, u8 *data)
 654 {
 655         struct dsa_port *dp = dsa_slave_to_port(dev);
 656         struct dsa_switch *ds = dp->ds;
 657
 658         if (ds->ops->get_eeprom)
 659                 return ds->ops->get_eeprom(ds, eeprom, data);
 660
 661         return -EOPNOTSUPP;
 662 }
 663
 664 static int dsa_slave_set_eeprom(struct net_device *dev,
 665                                 struct ethtool_eeprom *eeprom, u8 *data)
 666 {
 667         struct dsa_port *dp = dsa_slave_to_port(dev);
 668         struct dsa_switch *ds = dp->ds;
 669
 670         if (ds->ops->set_eeprom)
 671                 return ds->ops->set_eeprom(ds, eeprom, data);
 672
 673         return -EOPNOTSUPP;
 674 }
 675
 676 static void dsa_slave_get_strings(struct net_device *dev,
 677                                   uint32_t stringset, uint8_t *data)
 678 {
 679         struct dsa_port *dp = dsa_slave_to_port(dev);
 680         struct dsa_switch *ds = dp->ds;
 681
 682         if (stringset == ETH_SS_STATS) {
 683                 int len = ETH_GSTRING_LEN;
 684
 685                 strncpy(data, "tx_packets", len);
 686                 strncpy(data + len, "tx_bytes", len);
 687                 strncpy(data + 2 * len, "rx_packets", len);
 688                 strncpy(data + 3 * len, "rx_bytes", len);
 689                 if (ds->ops->get_strings)
 690                         ds->ops->get_strings(ds, dp->index, stringset,
 691                                              data + 4 * len);
 692         }
 693 }
 694
 695 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 696                                         struct ethtool_stats *stats,
 697                                         uint64_t *data)
 698 {
 699         struct dsa_port *dp = dsa_slave_to_port(dev);
 700         struct dsa_switch *ds = dp->ds;
 701         struct pcpu_sw_netstats *s;
 702         unsigned int start;
 703         int i;
 704
 705         for_each_possible_cpu(i) {
 706                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 707
 708                 s = per_cpu_ptr(dev->tstats, i);
 709                 do {
 710                         start = u64_stats_fetch_begin_irq(&s->syncp);
 711                         tx_packets = s->tx_packets;
 712                         tx_bytes = s->tx_bytes;
 713                         rx_packets = s->rx_packets;
 714                         rx_bytes = s->rx_bytes;
 715                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 716                 data[0] += tx_packets;
 717                 data[1] += tx_bytes;
 718                 data[2] += rx_packets;
 719                 data[3] += rx_bytes;
 720         }
 721         if (ds->ops->get_ethtool_stats)
 722                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 723 }
 724
 725 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 726 {
 727         struct dsa_port *dp = dsa_slave_to_port(dev);
 728         struct dsa_switch *ds = dp->ds;
 729
 730         if (sset == ETH_SS_STATS) {
 731                 int count;
 732
 733                 count = 4;
 734                 if (ds->ops->get_sset_count)
 735                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 736
 737                 return count;
 738         }
 739
 740         return -EOPNOTSUPP;
 741 }
 742
 743 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 744 {
 745         struct dsa_port *dp = dsa_slave_to_port(dev);
 746         struct dsa_switch *ds = dp->ds;
 747
 748         phylink_ethtool_get_wol(dp->pl, w);
 749
 750         if (ds->ops->get_wol)
 751                 ds->ops->get_wol(ds, dp->index, w);
 752 }
 753
 754 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 755 {
 756         struct dsa_port *dp = dsa_slave_to_port(dev);
 757         struct dsa_switch *ds = dp->ds;
 758         int ret = -EOPNOTSUPP;
 759
 760         phylink_ethtool_set_wol(dp->pl, w);
 761
 762         if (ds->ops->set_wol)
 763                 ret = ds->ops->set_wol(ds, dp->index, w);
 764
 765         return ret;
 766 }
 767
 768 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 769 {
 770         struct dsa_port *dp = dsa_slave_to_port(dev);
 771         struct dsa_switch *ds = dp->ds;
 772         int ret;
 773
 774         /* Port's PHY and MAC both need to be EEE capable */
 775         if (!dev->phydev || !dp->pl)
 776                 return -ENODEV;
 777
 778         if (!ds->ops->set_mac_eee)
 779                 return -EOPNOTSUPP;
 780
 781         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 782         if (ret)
 783                 return ret;
 784
 785         return phylink_ethtool_set_eee(dp->pl, e);
 786 }
 787
 788 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 789 {
 790         struct dsa_port *dp = dsa_slave_to_port(dev);
 791         struct dsa_switch *ds = dp->ds;
 792         int ret;
 793
 794         /* Port's PHY and MAC both need to be EEE capable */
 795         if (!dev->phydev || !dp->pl)
 796                 return -ENODEV;
 797
 798         if (!ds->ops->get_mac_eee)
 799                 return -EOPNOTSUPP;
 800
 801         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 802         if (ret)
 803                 return ret;
 804
 805         return phylink_ethtool_get_eee(dp->pl, e);
 806 }
 807
 808 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 809                                         struct ethtool_link_ksettings *cmd)
 810 {
 811         struct dsa_port *dp = dsa_slave_to_port(dev);
 812
 813         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 814 }
 815
 816 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 817                                         const struct ethtool_link_ksettings *cmd)
 818 {
 819         struct dsa_port *dp = dsa_slave_to_port(dev);
 820
 821         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 822 }
 823
 824 static void dsa_slave_get_pauseparam(struct net_device *dev,
 825                                      struct ethtool_pauseparam *pause)
 826 {
 827         struct dsa_port *dp = dsa_slave_to_port(dev);
 828
 829         phylink_ethtool_get_pauseparam(dp->pl, pause);
 830 }
 831
 832 static int dsa_slave_set_pauseparam(struct net_device *dev,
 833                                     struct ethtool_pauseparam *pause)
 834 {
 835         struct dsa_port *dp = dsa_slave_to_port(dev);
 836
 837         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 838 }
 839
 840 #ifdef CONFIG_NET_POLL_CONTROLLER
 841 static int dsa_slave_netpoll_setup(struct net_device *dev,
 842                                    struct netpoll_info *ni)
 843 {
 844         struct net_device *master = dsa_slave_to_master(dev);
 845         struct dsa_slave_priv *p = netdev_priv(dev);
 846         struct netpoll *netpoll;
 847         int err = 0;
 848
 849         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 850         if (!netpoll)
 851                 return -ENOMEM;
 852
 853         err = __netpoll_setup(netpoll, master);
 854         if (err) {
 855                 kfree(netpoll);
 856                 goto out;
 857         }
 858
 859         p->netpoll = netpoll;
 860 out:
 861         return err;
 862 }
 863
 864 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 865 {
 866         struct dsa_slave_priv *p = netdev_priv(dev);
 867         struct netpoll *netpoll = p->netpoll;
 868
 869         if (!netpoll)
 870                 return;
 871
 872         p->netpoll = NULL;
 873
 874         __netpoll_free(netpoll);
 875 }
 876
 877 static void dsa_slave_poll_controller(struct net_device *dev)
 878 {
 879 }
 880 #endif
 881
 882 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 883                                         char *name, size_t len)
 884 {
 885         struct dsa_port *dp = dsa_slave_to_port(dev);
 886
 887         /* For non-legacy ports, devlink is used and it takes
 888          * care of the name generation. This ndo implementation
 889          * should be removed with legacy support.
 890          */
 891         if (dp->ds->devlink)
 892                 return -EOPNOTSUPP;
 893
 894         if (snprintf(name, len, "p%d", dp->index) >= len)
 895                 return -EINVAL;
 896
 897         return 0;
 898 }
 899
 900 static struct dsa_mall_tc_entry *
 901 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 902 {
 903         struct dsa_slave_priv *p = netdev_priv(dev);
 904         struct dsa_mall_tc_entry *mall_tc_entry;
 905
 906         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 907                 if (mall_tc_entry->cookie == cookie)
 908                         return mall_tc_entry;
 909
 910         return NULL;
 911 }
 912
 913 static int
 914 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 915                                   struct tc_cls_matchall_offload *cls,
 916                                   bool ingress)
 917 {
 918         struct dsa_port *dp = dsa_slave_to_port(dev);
 919         struct dsa_slave_priv *p = netdev_priv(dev);
 920         struct dsa_mall_mirror_tc_entry *mirror;
 921         struct dsa_mall_tc_entry *mall_tc_entry;
 922         struct dsa_switch *ds = dp->ds;
 923         struct flow_action_entry *act;
 924         struct dsa_port *to_dp;
 925         int err;
 926
 927         if (!ds->ops->port_mirror_add)
 928                 return -EOPNOTSUPP;
 929
 930         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 931                                               cls->common.extack))
 932                 return -EOPNOTSUPP;
 933
 934         act = &cls->rule->action.entries[0];
 935
 936         if (!act->dev)
 937                 return -EINVAL;
 938
 939         if (!dsa_slave_dev_check(act->dev))
 940                 return -EOPNOTSUPP;
 941
 942         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 943         if (!mall_tc_entry)
 944                 return -ENOMEM;
 945
 946         mall_tc_entry->cookie = cls->cookie;
 947         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 948         mirror = &mall_tc_entry->mirror;
 949
 950         to_dp = dsa_slave_to_port(act->dev);
 951
 952         mirror->to_local_port = to_dp->index;
 953         mirror->ingress = ingress;
 954
 955         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 956         if (err) {
 957                 kfree(mall_tc_entry);
 958                 return err;
 959         }
 960
 961         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 962
 963         return err;
 964 }
 965
 966 static int
 967 dsa_slave_add_cls_matchall_police(struct net_device *dev,
 968                                   struct tc_cls_matchall_offload *cls,
 969                                   bool ingress)
 970 {
 971         struct netlink_ext_ack *extack = cls->common.extack;
 972         struct dsa_port *dp = dsa_slave_to_port(dev);
 973         struct dsa_slave_priv *p = netdev_priv(dev);
 974         struct dsa_mall_policer_tc_entry *policer;
 975         struct dsa_mall_tc_entry *mall_tc_entry;
 976         struct dsa_switch *ds = dp->ds;
 977         struct flow_action_entry *act;
 978         int err;
 979
 980         if (!ds->ops->port_policer_add) {
 981                 NL_SET_ERR_MSG_MOD(extack,
 982                                    "Policing offload not implemented");
 983                 return -EOPNOTSUPP;
 984         }
 985
 986         if (!ingress) {
 987                 NL_SET_ERR_MSG_MOD(extack,
 988                                    "Only supported on ingress qdisc");
 989                 return -EOPNOTSUPP;
 990         }
 991
 992         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 993                                               cls->common.extack))
 994                 return -EOPNOTSUPP;
 995
 996         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
 997                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
 998                         NL_SET_ERR_MSG_MOD(extack,
 999                                            "Only one port policer allowed");
1000                         return -EEXIST;
1001                 }
1002         }
1003
1004         act = &cls->rule->action.entries[0];
1005
1006         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1007         if (!mall_tc_entry)
1008                 return -ENOMEM;
1009
1010         mall_tc_entry->cookie = cls->cookie;
1011         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1012         policer = &mall_tc_entry->policer;
1013         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1014         policer->burst = act->police.burst;
1015
1016         err = ds->ops->port_policer_add(ds, dp->index, policer);
1017         if (err) {
1018                 kfree(mall_tc_entry);
1019                 return err;
1020         }
1021
1022         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1023
1024         return err;
1025 }
1026
1027 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1028                                       struct tc_cls_matchall_offload *cls,
1029                                       bool ingress)
1030 {
1031         int err = -EOPNOTSUPP;
1032
1033         if (cls->common.protocol == htons(ETH_P_ALL) &&
1034             flow_offload_has_one_action(&cls->rule->action) &&
1035             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1036                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1037         else if (flow_offload_has_one_action(&cls->rule->action) &&
1038                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1039                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1040
1041         return err;
1042 }
1043
1044 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1045                                        struct tc_cls_matchall_offload *cls)
1046 {
1047         struct dsa_port *dp = dsa_slave_to_port(dev);
1048         struct dsa_mall_tc_entry *mall_tc_entry;
1049         struct dsa_switch *ds = dp->ds;
1050
1051         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1052         if (!mall_tc_entry)
1053                 return;
1054
1055         list_del(&mall_tc_entry->list);
1056
1057         switch (mall_tc_entry->type) {
1058         case DSA_PORT_MALL_MIRROR:
1059                 if (ds->ops->port_mirror_del)
1060                         ds->ops->port_mirror_del(ds, dp->index,
1061                                                  &mall_tc_entry->mirror);
1062                 break;
1063         case DSA_PORT_MALL_POLICER:
1064                 if (ds->ops->port_policer_del)
1065                         ds->ops->port_policer_del(ds, dp->index);
1066                 break;
1067         default:
1068                 WARN_ON(1);
1069         }
1070
1071         kfree(mall_tc_entry);
1072 }
1073
1074 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1075                                            struct tc_cls_matchall_offload *cls,
1076                                            bool ingress)
1077 {
1078         if (cls->common.chain_index)
1079                 return -EOPNOTSUPP;
1080
1081         switch (cls->command) {
1082         case TC_CLSMATCHALL_REPLACE:
1083                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1084         case TC_CLSMATCHALL_DESTROY:
1085                 dsa_slave_del_cls_matchall(dev, cls);
1086                 return 0;
1087         default:
1088                 return -EOPNOTSUPP;
1089         }
1090 }
1091
1092 static int dsa_slave_add_cls_flower(struct net_device *dev,
1093                                     struct flow_cls_offload *cls,
1094                                     bool ingress)
1095 {
1096         struct dsa_port *dp = dsa_slave_to_port(dev);
1097         struct dsa_switch *ds = dp->ds;
1098         int port = dp->index;
1099
1100         if (!ds->ops->cls_flower_add)
1101                 return -EOPNOTSUPP;
1102
1103         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1104 }
1105
1106 static int dsa_slave_del_cls_flower(struct net_device *dev,
1107                                     struct flow_cls_offload *cls,
1108                                     bool ingress)
1109 {
1110         struct dsa_port *dp = dsa_slave_to_port(dev);
1111         struct dsa_switch *ds = dp->ds;
1112         int port = dp->index;
1113
1114         if (!ds->ops->cls_flower_del)
1115                 return -EOPNOTSUPP;
1116
1117         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1118 }
1119
1120 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1121                                       struct flow_cls_offload *cls,
1122                                       bool ingress)
1123 {
1124         struct dsa_port *dp = dsa_slave_to_port(dev);
1125         struct dsa_switch *ds = dp->ds;
1126         int port = dp->index;
1127
1128         if (!ds->ops->cls_flower_stats)
1129                 return -EOPNOTSUPP;
1130
1131         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1132 }
1133
1134 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1135                                          struct flow_cls_offload *cls,
1136                                          bool ingress)
1137 {
1138         switch (cls->command) {
1139         case FLOW_CLS_REPLACE:
1140                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1141         case FLOW_CLS_DESTROY:
1142                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1143         case FLOW_CLS_STATS:
1144                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1145         default:
1146                 return -EOPNOTSUPP;
1147         }
1148 }
1149
1150 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1151                                        void *cb_priv, bool ingress)
1152 {
1153         struct net_device *dev = cb_priv;
1154
1155         if (!tc_can_offload(dev))
1156                 return -EOPNOTSUPP;
1157
1158         switch (type) {
1159         case TC_SETUP_CLSMATCHALL:
1160                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1161         case TC_SETUP_CLSFLOWER:
1162                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1163         default:
1164                 return -EOPNOTSUPP;
1165         }
1166 }
1167
1168 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1169                                           void *type_data, void *cb_priv)
1170 {
1171         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1172 }
1173
1174 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1175                                           void *type_data, void *cb_priv)
1176 {
1177         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1178 }
1179
1180 static LIST_HEAD(dsa_slave_block_cb_list);
1181
1182 static int dsa_slave_setup_tc_block(struct net_device *dev,
1183                                     struct flow_block_offload *f)
1184 {
1185         struct flow_block_cb *block_cb;
1186         flow_setup_cb_t *cb;
1187
1188         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1189                 cb = dsa_slave_setup_tc_block_cb_ig;
1190         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1191                 cb = dsa_slave_setup_tc_block_cb_eg;
1192         else
1193                 return -EOPNOTSUPP;
1194
1195         f->driver_block_list = &dsa_slave_block_cb_list;
1196
1197         switch (f->command) {
1198         case FLOW_BLOCK_BIND:
1199                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1200                         return -EBUSY;
1201
1202                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1203                 if (IS_ERR(block_cb))
1204                         return PTR_ERR(block_cb);
1205
1206                 flow_block_cb_add(block_cb, f);
1207                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1208                 return 0;
1209         case FLOW_BLOCK_UNBIND:
1210                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1211                 if (!block_cb)
1212                         return -ENOENT;
1213
1214                 flow_block_cb_remove(block_cb, f);
1215                 list_del(&block_cb->driver_list);
1216                 return 0;
1217         default:
1218                 return -EOPNOTSUPP;
1219         }
1220 }
1221
1222 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1223                               void *type_data)
1224 {
1225         struct dsa_port *dp = dsa_slave_to_port(dev);
1226         struct dsa_switch *ds = dp->ds;
1227
1228         if (type == TC_SETUP_BLOCK)
1229                 return dsa_slave_setup_tc_block(dev, type_data);
1230
1231         if (!ds->ops->port_setup_tc)
1232                 return -EOPNOTSUPP;
1233
1234         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1235 }
1236
1237 static int dsa_slave_get_rxnfc(struct net_device *dev,
1238                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1239 {
1240         struct dsa_port *dp = dsa_slave_to_port(dev);
1241         struct dsa_switch *ds = dp->ds;
1242
1243         if (!ds->ops->get_rxnfc)
1244                 return -EOPNOTSUPP;
1245
1246         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1247 }
1248
1249 static int dsa_slave_set_rxnfc(struct net_device *dev,
1250                                struct ethtool_rxnfc *nfc)
1251 {
1252         struct dsa_port *dp = dsa_slave_to_port(dev);
1253         struct dsa_switch *ds = dp->ds;
1254
1255         if (!ds->ops->set_rxnfc)
1256                 return -EOPNOTSUPP;
1257
1258         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1259 }
1260
1261 static int dsa_slave_get_ts_info(struct net_device *dev,
1262                                  struct ethtool_ts_info *ts)
1263 {
1264         struct dsa_slave_priv *p = netdev_priv(dev);
1265         struct dsa_switch *ds = p->dp->ds;
1266
1267         if (!ds->ops->get_ts_info)
1268                 return -EOPNOTSUPP;
1269
1270         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1271 }
1272
1273 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1274                                      u16 vid)
1275 {
1276         struct net_device *master = dsa_slave_to_master(dev);
1277         struct dsa_port *dp = dsa_slave_to_port(dev);
1278         struct switchdev_obj_port_vlan vlan = {
1279                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1280                 .vid = vid,
1281                 /* This API only allows programming tagged, non-PVID VIDs */
1282                 .flags = 0,
1283         };
1284         int ret;
1285
1286         /* User port... */
1287         ret = dsa_port_vlan_add(dp, &vlan);
1288         if (ret)
1289                 return ret;
1290
1291         /* And CPU port... */
1292         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan);
1293         if (ret)
1294                 return ret;
1295
1296         return vlan_vid_add(master, proto, vid);
1297 }
1298
1299 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1300                                       u16 vid)
1301 {
1302         struct net_device *master = dsa_slave_to_master(dev);
1303         struct dsa_port *dp = dsa_slave_to_port(dev);
1304         struct switchdev_obj_port_vlan vlan = {
1305                 .vid = vid,
1306                 /* This API only allows programming tagged, non-PVID VIDs */
1307                 .flags = 0,
1308         };
1309         int err;
1310
1311         /* Do not deprogram the CPU port as it may be shared with other user
1312          * ports which can be members of this VLAN as well.
1313          */
1314         err = dsa_port_vlan_del(dp, &vlan);
1315         if (err)
1316                 return err;
1317
1318         vlan_vid_del(master, proto, vid);
1319
1320         return 0;
1321 }
1322
1323 struct dsa_hw_port {
1324         struct list_head list;
1325         struct net_device *dev;
1326         int old_mtu;
1327 };
1328
1329 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1330 {
1331         const struct dsa_hw_port *p;
1332         int err;
1333
1334         list_for_each_entry(p, hw_port_list, list) {
1335                 if (p->dev->mtu == mtu)
1336                         continue;
1337
1338                 err = dev_set_mtu(p->dev, mtu);
1339                 if (err)
1340                         goto rollback;
1341         }
1342
1343         return 0;
1344
1345 rollback:
1346         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1347                 if (p->dev->mtu == p->old_mtu)
1348                         continue;
1349
1350                 if (dev_set_mtu(p->dev, p->old_mtu))
1351                         netdev_err(p->dev, "Failed to restore MTU\n");
1352         }
1353
1354         return err;
1355 }
1356
1357 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1358 {
1359         struct dsa_hw_port *p, *n;
1360
1361         list_for_each_entry_safe(p, n, hw_port_list, list)
1362                 kfree(p);
1363 }
1364
1365 /* Make the hardware datapath to/from @dev limited to a common MTU */
1366 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1367 {
1368         struct list_head hw_port_list;
1369         struct dsa_switch_tree *dst;
1370         int min_mtu = ETH_MAX_MTU;
1371         struct dsa_port *other_dp;
1372         int err;
1373
1374         if (!dp->ds->mtu_enforcement_ingress)
1375                 return;
1376
1377         if (!dp->bridge_dev)
1378                 return;
1379
1380         INIT_LIST_HEAD(&hw_port_list);
1381
1382         /* Populate the list of ports that are part of the same bridge
1383          * as the newly added/modified port
1384          */
1385         list_for_each_entry(dst, &dsa_tree_list, list) {
1386                 list_for_each_entry(other_dp, &dst->ports, list) {
1387                         struct dsa_hw_port *hw_port;
1388                         struct net_device *slave;
1389
1390                         if (other_dp->type != DSA_PORT_TYPE_USER)
1391                                 continue;
1392
1393                         if (other_dp->bridge_dev != dp->bridge_dev)
1394                                 continue;
1395
1396                         if (!other_dp->ds->mtu_enforcement_ingress)
1397                                 continue;
1398
1399                         slave = other_dp->slave;
1400
1401                         if (min_mtu > slave->mtu)
1402                                 min_mtu = slave->mtu;
1403
1404                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1405                         if (!hw_port)
1406                                 goto out;
1407
1408                         hw_port->dev = slave;
1409                         hw_port->old_mtu = slave->mtu;
1410
1411                         list_add(&hw_port->list, &hw_port_list);
1412                 }
1413         }
1414
1415         /* Attempt to configure the entire hardware bridge to the newly added
1416          * interface's MTU first, regardless of whether the intention of the
1417          * user was to raise or lower it.
1418          */
1419         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1420         if (!err)
1421                 goto out;
1422
1423         /* Clearly that didn't work out so well, so just set the minimum MTU on
1424          * all hardware bridge ports now. If this fails too, then all ports will
1425          * still have their old MTU rolled back anyway.
1426          */
1427         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1428
1429 out:
1430         dsa_hw_port_list_free(&hw_port_list);
1431 }
1432
1433 static int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1434 {
1435         struct net_device *master = dsa_slave_to_master(dev);
1436         struct dsa_port *dp = dsa_slave_to_port(dev);
1437         struct dsa_slave_priv *p = netdev_priv(dev);
1438         struct dsa_switch *ds = p->dp->ds;
1439         struct dsa_port *cpu_dp;
1440         int port = p->dp->index;
1441         int largest_mtu = 0;
1442         int new_master_mtu;
1443         int old_master_mtu;
1444         int mtu_limit;
1445         int cpu_mtu;
1446         int err, i;
1447
1448         if (!ds->ops->port_change_mtu)
1449                 return -EOPNOTSUPP;
1450
1451         for (i = 0; i < ds->num_ports; i++) {
1452                 int slave_mtu;
1453
1454                 if (!dsa_is_user_port(ds, i))
1455                         continue;
1456
1457                 /* During probe, this function will be called for each slave
1458                  * device, while not all of them have been allocated. That's
1459                  * ok, it doesn't change what the maximum is, so ignore it.
1460                  */
1461                 if (!dsa_to_port(ds, i)->slave)
1462                         continue;
1463
1464                 /* Pretend that we already applied the setting, which we
1465                  * actually haven't (still haven't done all integrity checks)
1466                  */
1467                 if (i == port)
1468                         slave_mtu = new_mtu;
1469                 else
1470                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1471
1472                 if (largest_mtu < slave_mtu)
1473                         largest_mtu = slave_mtu;
1474         }
1475
1476         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1477
1478         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1479         old_master_mtu = master->mtu;
1480         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1481         if (new_master_mtu > mtu_limit)
1482                 return -ERANGE;
1483
1484         /* If the master MTU isn't over limit, there's no need to check the CPU
1485          * MTU, since that surely isn't either.
1486          */
1487         cpu_mtu = largest_mtu;
1488
1489         /* Start applying stuff */
1490         if (new_master_mtu != old_master_mtu) {
1491                 err = dev_set_mtu(master, new_master_mtu);
1492                 if (err < 0)
1493                         goto out_master_failed;
1494
1495                 /* We only need to propagate the MTU of the CPU port to
1496                  * upstream switches.
1497                  */
1498                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1499                 if (err)
1500                         goto out_cpu_failed;
1501         }
1502
1503         err = dsa_port_mtu_change(dp, new_mtu, false);
1504         if (err)
1505                 goto out_port_failed;
1506
1507         dev->mtu = new_mtu;
1508
1509         dsa_bridge_mtu_normalization(dp);
1510
1511         return 0;
1512
1513 out_port_failed:
1514         if (new_master_mtu != old_master_mtu)
1515                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1516                                     cpu_dp->tag_ops->overhead,
1517                                     true);
1518 out_cpu_failed:
1519         if (new_master_mtu != old_master_mtu)
1520                 dev_set_mtu(master, old_master_mtu);
1521 out_master_failed:
1522         return err;
1523 }
1524
1525 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1526         .get_drvinfo            = dsa_slave_get_drvinfo,
1527         .get_regs_len           = dsa_slave_get_regs_len,
1528         .get_regs               = dsa_slave_get_regs,
1529         .nway_reset             = dsa_slave_nway_reset,
1530         .get_link               = ethtool_op_get_link,
1531         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1532         .get_eeprom             = dsa_slave_get_eeprom,
1533         .set_eeprom             = dsa_slave_set_eeprom,
1534         .get_strings            = dsa_slave_get_strings,
1535         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1536         .get_sset_count         = dsa_slave_get_sset_count,
1537         .set_wol                = dsa_slave_set_wol,
1538         .get_wol                = dsa_slave_get_wol,
1539         .set_eee                = dsa_slave_set_eee,
1540         .get_eee                = dsa_slave_get_eee,
1541         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1542         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1543         .get_pauseparam         = dsa_slave_get_pauseparam,
1544         .set_pauseparam         = dsa_slave_set_pauseparam,
1545         .get_rxnfc              = dsa_slave_get_rxnfc,
1546         .set_rxnfc              = dsa_slave_set_rxnfc,
1547         .get_ts_info            = dsa_slave_get_ts_info,
1548 };
1549
1550 /* legacy way, bypassing the bridge *****************************************/
1551 static int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1552                               struct net_device *dev,
1553                               const unsigned char *addr, u16 vid,
1554                               u16 flags,
1555                               struct netlink_ext_ack *extack)
1556 {
1557         struct dsa_port *dp = dsa_slave_to_port(dev);
1558
1559         return dsa_port_fdb_add(dp, addr, vid);
1560 }
1561
1562 static int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1563                               struct net_device *dev,
1564                               const unsigned char *addr, u16 vid)
1565 {
1566         struct dsa_port *dp = dsa_slave_to_port(dev);
1567
1568         return dsa_port_fdb_del(dp, addr, vid);
1569 }
1570
1571 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1572 {
1573         struct dsa_port *dp = dsa_slave_to_port(dev);
1574
1575         return dp->ds->devlink ? &dp->devlink_port : NULL;
1576 }
1577
1578 static void dsa_slave_get_stats64(struct net_device *dev,
1579                                   struct rtnl_link_stats64 *s)
1580 {
1581         struct dsa_port *dp = dsa_slave_to_port(dev);
1582         struct dsa_switch *ds = dp->ds;
1583
1584         if (ds->ops->get_stats64)
1585                 ds->ops->get_stats64(ds, dp->index, s);
1586         else
1587                 dev_get_tstats64(dev, s);
1588 }
1589
1590 static const struct net_device_ops dsa_slave_netdev_ops = {
1591         .ndo_open               = dsa_slave_open,
1592         .ndo_stop               = dsa_slave_close,
1593         .ndo_start_xmit         = dsa_slave_xmit,
1594         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1595         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1596         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1597         .ndo_fdb_add            = dsa_legacy_fdb_add,
1598         .ndo_fdb_del            = dsa_legacy_fdb_del,
1599         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1600         .ndo_do_ioctl           = dsa_slave_ioctl,
1601         .ndo_get_iflink         = dsa_slave_get_iflink,
1602 #ifdef CONFIG_NET_POLL_CONTROLLER
1603         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1604         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1605         .ndo_poll_controller    = dsa_slave_poll_controller,
1606 #endif
1607         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1608         .ndo_setup_tc           = dsa_slave_setup_tc,
1609         .ndo_get_stats64        = dsa_slave_get_stats64,
1610         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1611         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1612         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1613         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1614         .ndo_change_mtu         = dsa_slave_change_mtu,
1615 };
1616
1617 static struct device_type dsa_type = {
1618         .name   = "dsa",
1619 };
1620
1621 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1622 {
1623         const struct dsa_port *dp = dsa_to_port(ds, port);
1624
1625         if (dp->pl)
1626                 phylink_mac_change(dp->pl, up);
1627 }
1628 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1629
1630 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1631                                           struct phylink_link_state *state)
1632 {
1633         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1634         struct dsa_switch *ds = dp->ds;
1635
1636         /* No need to check that this operation is valid, the callback would
1637          * not be called if it was not.
1638          */
1639         ds->ops->phylink_fixed_state(ds, dp->index, state);
1640 }
1641
1642 /* slave device setup *******************************************************/
1643 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1644 {
1645         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1646         struct dsa_switch *ds = dp->ds;
1647
1648         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1649         if (!slave_dev->phydev) {
1650                 netdev_err(slave_dev, "no phy at %d\n", addr);
1651                 return -ENODEV;
1652         }
1653
1654         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1655 }
1656
1657 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1658 {
1659         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1660         struct device_node *port_dn = dp->dn;
1661         struct dsa_switch *ds = dp->ds;
1662         phy_interface_t mode;
1663         u32 phy_flags = 0;
1664         int ret;
1665
1666         ret = of_get_phy_mode(port_dn, &mode);
1667         if (ret)
1668                 mode = PHY_INTERFACE_MODE_NA;
1669
1670         dp->pl_config.dev = &slave_dev->dev;
1671         dp->pl_config.type = PHYLINK_NETDEV;
1672
1673         /* The get_fixed_state callback takes precedence over polling the
1674          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1675          * this if the switch provides such a callback.
1676          */
1677         if (ds->ops->phylink_fixed_state) {
1678                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1679                 dp->pl_config.poll_fixed_state = true;
1680         }
1681
1682         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1683                                 &dsa_port_phylink_mac_ops);
1684         if (IS_ERR(dp->pl)) {
1685                 netdev_err(slave_dev,
1686                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1687                 return PTR_ERR(dp->pl);
1688         }
1689
1690         if (ds->ops->get_phy_flags)
1691                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1692
1693         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1694         if (ret == -ENODEV && ds->slave_mii_bus) {
1695                 /* We could not connect to a designated PHY or SFP, so try to
1696                  * use the switch internal MDIO bus instead
1697                  */
1698                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1699                 if (ret) {
1700                         netdev_err(slave_dev,
1701                                    "failed to connect to port %d: %d\n",
1702                                    dp->index, ret);
1703                         phylink_destroy(dp->pl);
1704                         return ret;
1705                 }
1706         }
1707
1708         return ret;
1709 }
1710
1711 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1712 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1713                                             struct netdev_queue *txq,
1714                                             void *_unused)
1715 {
1716         lockdep_set_class(&txq->_xmit_lock,
1717                           &dsa_slave_netdev_xmit_lock_key);
1718 }
1719
1720 int dsa_slave_suspend(struct net_device *slave_dev)
1721 {
1722         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1723
1724         if (!netif_running(slave_dev))
1725                 return 0;
1726
1727         netif_device_detach(slave_dev);
1728
1729         rtnl_lock();
1730         phylink_stop(dp->pl);
1731         rtnl_unlock();
1732
1733         return 0;
1734 }
1735
1736 int dsa_slave_resume(struct net_device *slave_dev)
1737 {
1738         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1739
1740         if (!netif_running(slave_dev))
1741                 return 0;
1742
1743         netif_device_attach(slave_dev);
1744
1745         rtnl_lock();
1746         phylink_start(dp->pl);
1747         rtnl_unlock();
1748
1749         return 0;
1750 }
1751
1752 int dsa_slave_create(struct dsa_port *port)
1753 {
1754         const struct dsa_port *cpu_dp = port->cpu_dp;
1755         struct net_device *master = cpu_dp->master;
1756         struct dsa_switch *ds = port->ds;
1757         const char *name = port->name;
1758         struct net_device *slave_dev;
1759         struct dsa_slave_priv *p;
1760         int ret;
1761
1762         if (!ds->num_tx_queues)
1763                 ds->num_tx_queues = 1;
1764
1765         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1766                                      NET_NAME_UNKNOWN, ether_setup,
1767                                      ds->num_tx_queues, 1);
1768         if (slave_dev == NULL)
1769                 return -ENOMEM;
1770
1771         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1772         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1773                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1774         slave_dev->hw_features |= NETIF_F_HW_TC;
1775         slave_dev->features |= NETIF_F_LLTX;
1776         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1777         if (!IS_ERR_OR_NULL(port->mac))
1778                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1779         else
1780                 eth_hw_addr_inherit(slave_dev, master);
1781         slave_dev->priv_flags |= IFF_NO_QUEUE;
1782         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1783         if (ds->ops->port_max_mtu)
1784                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1785         if (cpu_dp->tag_ops->tail_tag)
1786                 slave_dev->needed_tailroom = cpu_dp->tag_ops->overhead;
1787         else
1788                 slave_dev->needed_headroom = cpu_dp->tag_ops->overhead;
1789         /* Try to save one extra realloc later in the TX path (in the master)
1790          * by also inheriting the master's needed headroom and tailroom.
1791          * The 8021q driver also does this.
1792          */
1793         slave_dev->needed_headroom += master->needed_headroom;
1794         slave_dev->needed_tailroom += master->needed_tailroom;
1795         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1796
1797         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1798                                  NULL);
1799
1800         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1801         slave_dev->dev.of_node = port->dn;
1802         slave_dev->vlan_features = master->vlan_features;
1803
1804         p = netdev_priv(slave_dev);
1805         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1806         if (!slave_dev->tstats) {
1807                 free_netdev(slave_dev);
1808                 return -ENOMEM;
1809         }
1810
1811         ret = gro_cells_init(&p->gcells, slave_dev);
1812         if (ret)
1813                 goto out_free;
1814
1815         p->dp = port;
1816         INIT_LIST_HEAD(&p->mall_tc_list);
1817         p->xmit = cpu_dp->tag_ops->xmit;
1818         port->slave = slave_dev;
1819
1820         rtnl_lock();
1821         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1822         rtnl_unlock();
1823         if (ret && ret != -EOPNOTSUPP)
1824                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1825                          ret, ETH_DATA_LEN, port->index);
1826
1827         netif_carrier_off(slave_dev);
1828
1829         ret = dsa_slave_phy_setup(slave_dev);
1830         if (ret) {
1831                 netdev_err(slave_dev,
1832                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1833                            ret, ds->dst->index, ds->index, port->index);
1834                 goto out_gcells;
1835         }
1836
1837         rtnl_lock();
1838
1839         ret = register_netdevice(slave_dev);
1840         if (ret) {
1841                 netdev_err(master, "error %d registering interface %s\n",
1842                            ret, slave_dev->name);
1843                 rtnl_unlock();
1844                 goto out_phy;
1845         }
1846
1847         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1848
1849         rtnl_unlock();
1850
1851         if (ret)
1852                 goto out_unregister;
1853
1854         return 0;
1855
1856 out_unregister:
1857         unregister_netdev(slave_dev);
1858 out_phy:
1859         rtnl_lock();
1860         phylink_disconnect_phy(p->dp->pl);
1861         rtnl_unlock();
1862         phylink_destroy(p->dp->pl);
1863 out_gcells:
1864         gro_cells_destroy(&p->gcells);
1865 out_free:
1866         free_percpu(slave_dev->tstats);
1867         free_netdev(slave_dev);
1868         port->slave = NULL;
1869         return ret;
1870 }
1871
1872 void dsa_slave_destroy(struct net_device *slave_dev)
1873 {
1874         struct net_device *master = dsa_slave_to_master(slave_dev);
1875         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1876         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1877
1878         netif_carrier_off(slave_dev);
1879         rtnl_lock();
1880         netdev_upper_dev_unlink(master, slave_dev);
1881         unregister_netdevice(slave_dev);
1882         phylink_disconnect_phy(dp->pl);
1883         rtnl_unlock();
1884
1885         phylink_destroy(dp->pl);
1886         gro_cells_destroy(&p->gcells);
1887         free_percpu(slave_dev->tstats);
1888         free_netdev(slave_dev);
1889 }
1890
1891 bool dsa_slave_dev_check(const struct net_device *dev)
1892 {
1893         return dev->netdev_ops == &dsa_slave_netdev_ops;
1894 }
1895 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
1896
1897 static int dsa_slave_changeupper(struct net_device *dev,
1898                                  struct netdev_notifier_changeupper_info *info)
1899 {
1900         struct dsa_port *dp = dsa_slave_to_port(dev);
1901         int err = NOTIFY_DONE;
1902
1903         if (netif_is_bridge_master(info->upper_dev)) {
1904                 if (info->linking) {
1905                         err = dsa_port_bridge_join(dp, info->upper_dev);
1906                         if (!err)
1907                                 dsa_bridge_mtu_normalization(dp);
1908                         err = notifier_from_errno(err);
1909                 } else {
1910                         dsa_port_bridge_leave(dp, info->upper_dev);
1911                         err = NOTIFY_OK;
1912                 }
1913         } else if (netif_is_lag_master(info->upper_dev)) {
1914                 if (info->linking) {
1915                         err = dsa_port_lag_join(dp, info->upper_dev,
1916                                                 info->upper_info);
1917                         if (err == -EOPNOTSUPP) {
1918                                 NL_SET_ERR_MSG_MOD(info->info.extack,
1919                                                    "Offloading not supported");
1920                                 err = 0;
1921                         }
1922                         err = notifier_from_errno(err);
1923                 } else {
1924                         dsa_port_lag_leave(dp, info->upper_dev);
1925                         err = NOTIFY_OK;
1926                 }
1927         }
1928
1929         return err;
1930 }
1931
1932 static int
1933 dsa_slave_lag_changeupper(struct net_device *dev,
1934                           struct netdev_notifier_changeupper_info *info)
1935 {
1936         struct net_device *lower;
1937         struct list_head *iter;
1938         int err = NOTIFY_DONE;
1939         struct dsa_port *dp;
1940
1941         netdev_for_each_lower_dev(dev, lower, iter) {
1942                 if (!dsa_slave_dev_check(lower))
1943                         continue;
1944
1945                 dp = dsa_slave_to_port(lower);
1946                 if (!dp->lag_dev)
1947                         /* Software LAG */
1948                         continue;
1949
1950                 err = dsa_slave_changeupper(lower, info);
1951                 if (notifier_to_errno(err))
1952                         break;
1953         }
1954
1955         return err;
1956 }
1957
1958 static int
1959 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
1960                                  struct netdev_notifier_changeupper_info *info)
1961 {
1962         struct netlink_ext_ack *ext_ack;
1963         struct net_device *slave;
1964         struct dsa_port *dp;
1965
1966         ext_ack = netdev_notifier_info_to_extack(&info->info);
1967
1968         if (!is_vlan_dev(dev))
1969                 return NOTIFY_DONE;
1970
1971         slave = vlan_dev_real_dev(dev);
1972         if (!dsa_slave_dev_check(slave))
1973                 return NOTIFY_DONE;
1974
1975         dp = dsa_slave_to_port(slave);
1976         if (!dp->bridge_dev)
1977                 return NOTIFY_DONE;
1978
1979         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1980         if (br_vlan_enabled(dp->bridge_dev) &&
1981             netif_is_bridge_master(info->upper_dev) && info->linking) {
1982                 NL_SET_ERR_MSG_MOD(ext_ack,
1983                                    "Cannot enslave VLAN device into VLAN aware bridge");
1984                 return notifier_from_errno(-EINVAL);
1985         }
1986
1987         return NOTIFY_DONE;
1988 }
1989
1990 static int
1991 dsa_slave_check_8021q_upper(struct net_device *dev,
1992                             struct netdev_notifier_changeupper_info *info)
1993 {
1994         struct dsa_port *dp = dsa_slave_to_port(dev);
1995         struct net_device *br = dp->bridge_dev;
1996         struct bridge_vlan_info br_info;
1997         struct netlink_ext_ack *extack;
1998         int err = NOTIFY_DONE;
1999         u16 vid;
2000
2001         if (!br || !br_vlan_enabled(br))
2002                 return NOTIFY_DONE;
2003
2004         extack = netdev_notifier_info_to_extack(&info->info);
2005         vid = vlan_dev_vlan_id(info->upper_dev);
2006
2007         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2008          * device, respectively the VID is not found, returning
2009          * 0 means success, which is a failure for us here.
2010          */
2011         err = br_vlan_get_info(br, vid, &br_info);
2012         if (err == 0) {
2013                 NL_SET_ERR_MSG_MOD(extack,
2014                                    "This VLAN is already configured by the bridge");
2015                 return notifier_from_errno(-EBUSY);
2016         }
2017
2018         return NOTIFY_DONE;
2019 }
2020
2021 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2022                                      unsigned long event, void *ptr)
2023 {
2024         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2025
2026         switch (event) {
2027         case NETDEV_PRECHANGEUPPER: {
2028                 struct netdev_notifier_changeupper_info *info = ptr;
2029                 struct dsa_switch *ds;
2030                 struct dsa_port *dp;
2031                 int err;
2032
2033                 if (!dsa_slave_dev_check(dev))
2034                         return dsa_prevent_bridging_8021q_upper(dev, ptr);
2035
2036                 dp = dsa_slave_to_port(dev);
2037                 ds = dp->ds;
2038
2039                 if (ds->ops->port_prechangeupper) {
2040                         err = ds->ops->port_prechangeupper(ds, dp->index, info);
2041                         if (err)
2042                                 return notifier_from_errno(err);
2043                 }
2044
2045                 if (is_vlan_dev(info->upper_dev))
2046                         return dsa_slave_check_8021q_upper(dev, ptr);
2047                 break;
2048         }
2049         case NETDEV_CHANGEUPPER:
2050                 if (dsa_slave_dev_check(dev))
2051                         return dsa_slave_changeupper(dev, ptr);
2052
2053                 if (netif_is_lag_master(dev))
2054                         return dsa_slave_lag_changeupper(dev, ptr);
2055
2056                 break;
2057         case NETDEV_CHANGELOWERSTATE: {
2058                 struct netdev_notifier_changelowerstate_info *info = ptr;
2059                 struct dsa_port *dp;
2060                 int err;
2061
2062                 if (!dsa_slave_dev_check(dev))
2063                         break;
2064
2065                 dp = dsa_slave_to_port(dev);
2066
2067                 err = dsa_port_lag_change(dp, info->lower_state_info);
2068                 return notifier_from_errno(err);
2069         }
2070         }
2071
2072         return NOTIFY_DONE;
2073 }
2074
2075 static void
2076 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2077 {
2078         struct dsa_switch *ds = switchdev_work->ds;
2079         struct switchdev_notifier_fdb_info info;
2080         struct dsa_port *dp;
2081
2082         if (!dsa_is_user_port(ds, switchdev_work->port))
2083                 return;
2084
2085         info.addr = switchdev_work->addr;
2086         info.vid = switchdev_work->vid;
2087         info.offloaded = true;
2088         dp = dsa_to_port(ds, switchdev_work->port);
2089         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2090                                  dp->slave, &info.info, NULL);
2091 }
2092
2093 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2094 {
2095         struct dsa_switchdev_event_work *switchdev_work =
2096                 container_of(work, struct dsa_switchdev_event_work, work);
2097         struct dsa_switch *ds = switchdev_work->ds;
2098         struct dsa_port *dp;
2099         int err;
2100
2101         dp = dsa_to_port(ds, switchdev_work->port);
2102
2103         rtnl_lock();
2104         switch (switchdev_work->event) {
2105         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2106                 err = dsa_port_fdb_add(dp, switchdev_work->addr,
2107                                        switchdev_work->vid);
2108                 if (err) {
2109                         dev_err(ds->dev,
2110                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2111                                 dp->index, switchdev_work->addr,
2112                                 switchdev_work->vid, err);
2113                         break;
2114                 }
2115                 dsa_fdb_offload_notify(switchdev_work);
2116                 break;
2117
2118         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2119                 err = dsa_port_fdb_del(dp, switchdev_work->addr,
2120                                        switchdev_work->vid);
2121                 if (err) {
2122                         dev_err(ds->dev,
2123                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2124                                 dp->index, switchdev_work->addr,
2125                                 switchdev_work->vid, err);
2126                 }
2127
2128                 break;
2129         }
2130         rtnl_unlock();
2131
2132         kfree(switchdev_work);
2133         if (dsa_is_user_port(ds, dp->index))
2134                 dev_put(dp->slave);
2135 }
2136
2137 static int dsa_lower_dev_walk(struct net_device *lower_dev,
2138                               struct netdev_nested_priv *priv)
2139 {
2140         if (dsa_slave_dev_check(lower_dev)) {
2141                 priv->data = (void *)netdev_priv(lower_dev);
2142                 return 1;
2143         }
2144
2145         return 0;
2146 }
2147
2148 static struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev)
2149 {
2150         struct netdev_nested_priv priv = {
2151                 .data = NULL,
2152         };
2153
2154         netdev_walk_all_lower_dev_rcu(dev, dsa_lower_dev_walk, &priv);
2155
2156         return (struct dsa_slave_priv *)priv.data;
2157 }
2158
2159 /* Called under rcu_read_lock() */
2160 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2161                                      unsigned long event, void *ptr)
2162 {
2163         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2164         const struct switchdev_notifier_fdb_info *fdb_info;
2165         struct dsa_switchdev_event_work *switchdev_work;
2166         struct dsa_port *dp;
2167         int err;
2168
2169         switch (event) {
2170         case SWITCHDEV_PORT_ATTR_SET:
2171                 err = switchdev_handle_port_attr_set(dev, ptr,
2172                                                      dsa_slave_dev_check,
2173                                                      dsa_slave_port_attr_set);
2174                 return notifier_from_errno(err);
2175         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2176         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2177                 fdb_info = ptr;
2178
2179                 if (dsa_slave_dev_check(dev)) {
2180                         if (!fdb_info->added_by_user)
2181                                 return NOTIFY_OK;
2182
2183                         dp = dsa_slave_to_port(dev);
2184                 } else {
2185                         /* Snoop addresses learnt on foreign interfaces
2186                          * bridged with us, for switches that don't
2187                          * automatically learn SA from CPU-injected traffic
2188                          */
2189                         struct net_device *br_dev;
2190                         struct dsa_slave_priv *p;
2191
2192                         br_dev = netdev_master_upper_dev_get_rcu(dev);
2193                         if (!br_dev)
2194                                 return NOTIFY_DONE;
2195
2196                         if (!netif_is_bridge_master(br_dev))
2197                                 return NOTIFY_DONE;
2198
2199                         p = dsa_slave_dev_lower_find(br_dev);
2200                         if (!p)
2201                                 return NOTIFY_DONE;
2202
2203                         dp = p->dp->cpu_dp;
2204
2205                         if (!dp->ds->assisted_learning_on_cpu_port)
2206                                 return NOTIFY_DONE;
2207                 }
2208
2209                 if (!dp->ds->ops->port_fdb_add || !dp->ds->ops->port_fdb_del)
2210                         return NOTIFY_DONE;
2211
2212                 switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2213                 if (!switchdev_work)
2214                         return NOTIFY_BAD;
2215
2216                 INIT_WORK(&switchdev_work->work,
2217                           dsa_slave_switchdev_event_work);
2218                 switchdev_work->ds = dp->ds;
2219                 switchdev_work->port = dp->index;
2220                 switchdev_work->event = event;
2221
2222                 ether_addr_copy(switchdev_work->addr,
2223                                 fdb_info->addr);
2224                 switchdev_work->vid = fdb_info->vid;
2225
2226                 /* Hold a reference on the slave for dsa_fdb_offload_notify */
2227                 if (dsa_is_user_port(dp->ds, dp->index))
2228                         dev_hold(dev);
2229                 dsa_schedule_work(&switchdev_work->work);
2230                 break;
2231         default:
2232                 return NOTIFY_DONE;
2233         }
2234
2235         return NOTIFY_OK;
2236 }
2237
2238 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2239                                               unsigned long event, void *ptr)
2240 {
2241         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2242         int err;
2243
2244         switch (event) {
2245         case SWITCHDEV_PORT_OBJ_ADD:
2246                 err = switchdev_handle_port_obj_add(dev, ptr,
2247                                                     dsa_slave_dev_check,
2248                                                     dsa_slave_port_obj_add);
2249                 return notifier_from_errno(err);
2250         case SWITCHDEV_PORT_OBJ_DEL:
2251                 err = switchdev_handle_port_obj_del(dev, ptr,
2252                                                     dsa_slave_dev_check,
2253                                                     dsa_slave_port_obj_del);
2254                 return notifier_from_errno(err);
2255         case SWITCHDEV_PORT_ATTR_SET:
2256                 err = switchdev_handle_port_attr_set(dev, ptr,
2257                                                      dsa_slave_dev_check,
2258                                                      dsa_slave_port_attr_set);
2259                 return notifier_from_errno(err);
2260         }
2261
2262         return NOTIFY_DONE;
2263 }
2264
2265 static struct notifier_block dsa_slave_nb __read_mostly = {
2266         .notifier_call  = dsa_slave_netdevice_event,
2267 };
2268
2269 static struct notifier_block dsa_slave_switchdev_notifier = {
2270         .notifier_call = dsa_slave_switchdev_event,
2271 };
2272
2273 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2274         .notifier_call = dsa_slave_switchdev_blocking_event,
2275 };
2276
2277 int dsa_slave_register_notifier(void)
2278 {
2279         struct notifier_block *nb;
2280         int err;
2281
2282         err = register_netdevice_notifier(&dsa_slave_nb);
2283         if (err)
2284                 return err;
2285
2286         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2287         if (err)
2288                 goto err_switchdev_nb;
2289
2290         nb = &dsa_slave_switchdev_blocking_notifier;
2291         err = register_switchdev_blocking_notifier(nb);
2292         if (err)
2293                 goto err_switchdev_blocking_nb;
2294
2295         return 0;
2296
2297 err_switchdev_blocking_nb:
2298         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2299 err_switchdev_nb:
2300         unregister_netdevice_notifier(&dsa_slave_nb);
2301         return err;
2302 }
2303
2304 void dsa_slave_unregister_notifier(void)
2305 {
2306         struct notifier_block *nb;
2307         int err;
2308
2309         nb = &dsa_slave_switchdev_blocking_notifier;
2310         err = unregister_switchdev_blocking_notifier(nb);
2311         if (err)
2312                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2313
2314         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2315         if (err)
2316                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2317
2318         err = unregister_netdevice_notifier(&dsa_slave_nb);
2319         if (err)
2320                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2321 }