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