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/if_hsr.h>
  21 #include <linux/netpoll.h>
  22 #include <linux/ptp_classify.h>
  23
  24 #include "dsa_priv.h"
  25
  26 /* slave mii_bus handling ***************************************************/
  27 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  28 {
  29         struct dsa_switch *ds = bus->priv;
  30
  31         if (ds->phys_mii_mask & (1 << addr))
  32                 return ds->ops->phy_read(ds, addr, reg);
  33
  34         return 0xffff;
  35 }
  36
  37 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  38 {
  39         struct dsa_switch *ds = bus->priv;
  40
  41         if (ds->phys_mii_mask & (1 << addr))
  42                 return ds->ops->phy_write(ds, addr, reg, val);
  43
  44         return 0;
  45 }
  46
  47 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  48 {
  49         ds->slave_mii_bus->priv = (void *)ds;
  50         ds->slave_mii_bus->name = "dsa slave smi";
  51         ds->slave_mii_bus->read = dsa_slave_phy_read;
  52         ds->slave_mii_bus->write = dsa_slave_phy_write;
  53         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  54                  ds->dst->index, ds->index);
  55         ds->slave_mii_bus->parent = ds->dev;
  56         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  57 }
  58
  59
  60 /* slave device handling ****************************************************/
  61 static int dsa_slave_get_iflink(const struct net_device *dev)
  62 {
  63         return dsa_slave_to_master(dev)->ifindex;
  64 }
  65
  66 static int dsa_slave_open(struct net_device *dev)
  67 {
  68         struct net_device *master = dsa_slave_to_master(dev);
  69         struct dsa_port *dp = dsa_slave_to_port(dev);
  70         int err;
  71
  72         err = dev_open(master, NULL);
  73         if (err < 0) {
  74                 netdev_err(dev, "failed to open master %s\n", master->name);
  75                 goto out;
  76         }
  77
  78         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  79                 err = dev_uc_add(master, dev->dev_addr);
  80                 if (err < 0)
  81                         goto out;
  82         }
  83
  84         if (dev->flags & IFF_ALLMULTI) {
  85                 err = dev_set_allmulti(master, 1);
  86                 if (err < 0)
  87                         goto del_unicast;
  88         }
  89         if (dev->flags & IFF_PROMISC) {
  90                 err = dev_set_promiscuity(master, 1);
  91                 if (err < 0)
  92                         goto clear_allmulti;
  93         }
  94
  95         err = dsa_port_enable_rt(dp, dev->phydev);
  96         if (err)
  97                 goto clear_promisc;
  98
  99         return 0;
 100
 101 clear_promisc:
 102         if (dev->flags & IFF_PROMISC)
 103                 dev_set_promiscuity(master, -1);
 104 clear_allmulti:
 105         if (dev->flags & IFF_ALLMULTI)
 106                 dev_set_allmulti(master, -1);
 107 del_unicast:
 108         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 109                 dev_uc_del(master, dev->dev_addr);
 110 out:
 111         return err;
 112 }
 113
 114 static int dsa_slave_close(struct net_device *dev)
 115 {
 116         struct net_device *master = dsa_slave_to_master(dev);
 117         struct dsa_port *dp = dsa_slave_to_port(dev);
 118
 119         dsa_port_disable_rt(dp);
 120
 121         dev_mc_unsync(master, dev);
 122         dev_uc_unsync(master, dev);
 123         if (dev->flags & IFF_ALLMULTI)
 124                 dev_set_allmulti(master, -1);
 125         if (dev->flags & IFF_PROMISC)
 126                 dev_set_promiscuity(master, -1);
 127
 128         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 129                 dev_uc_del(master, dev->dev_addr);
 130
 131         return 0;
 132 }
 133
 134 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 135 {
 136         struct net_device *master = dsa_slave_to_master(dev);
 137         if (dev->flags & IFF_UP) {
 138                 if (change & IFF_ALLMULTI)
 139                         dev_set_allmulti(master,
 140                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 141                 if (change & IFF_PROMISC)
 142                         dev_set_promiscuity(master,
 143                                             dev->flags & IFF_PROMISC ? 1 : -1);
 144         }
 145 }
 146
 147 static void dsa_slave_set_rx_mode(struct net_device *dev)
 148 {
 149         struct net_device *master = dsa_slave_to_master(dev);
 150
 151         dev_mc_sync(master, dev);
 152         dev_uc_sync(master, dev);
 153 }
 154
 155 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 156 {
 157         struct net_device *master = dsa_slave_to_master(dev);
 158         struct sockaddr *addr = a;
 159         int err;
 160
 161         if (!is_valid_ether_addr(addr->sa_data))
 162                 return -EADDRNOTAVAIL;
 163
 164         if (!(dev->flags & IFF_UP))
 165                 goto out;
 166
 167         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 168                 err = dev_uc_add(master, addr->sa_data);
 169                 if (err < 0)
 170                         return err;
 171         }
 172
 173         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 174                 dev_uc_del(master, dev->dev_addr);
 175
 176 out:
 177         ether_addr_copy(dev->dev_addr, addr->sa_data);
 178
 179         return 0;
 180 }
 181
 182 struct dsa_slave_dump_ctx {
 183         struct net_device *dev;
 184         struct sk_buff *skb;
 185         struct netlink_callback *cb;
 186         int idx;
 187 };
 188
 189 static int
 190 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 191                            bool is_static, void *data)
 192 {
 193         struct dsa_slave_dump_ctx *dump = data;
 194         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 195         u32 seq = dump->cb->nlh->nlmsg_seq;
 196         struct nlmsghdr *nlh;
 197         struct ndmsg *ndm;
 198
 199         if (dump->idx < dump->cb->args[2])
 200                 goto skip;
 201
 202         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 203                         sizeof(*ndm), NLM_F_MULTI);
 204         if (!nlh)
 205                 return -EMSGSIZE;
 206
 207         ndm = nlmsg_data(nlh);
 208         ndm->ndm_family  = AF_BRIDGE;
 209         ndm->ndm_pad1    = 0;
 210         ndm->ndm_pad2    = 0;
 211         ndm->ndm_flags   = NTF_SELF;
 212         ndm->ndm_type    = 0;
 213         ndm->ndm_ifindex = dump->dev->ifindex;
 214         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 215
 216         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 217                 goto nla_put_failure;
 218
 219         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 220                 goto nla_put_failure;
 221
 222         nlmsg_end(dump->skb, nlh);
 223
 224 skip:
 225         dump->idx++;
 226         return 0;
 227
 228 nla_put_failure:
 229         nlmsg_cancel(dump->skb, nlh);
 230         return -EMSGSIZE;
 231 }
 232
 233 static int
 234 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 235                    struct net_device *dev, struct net_device *filter_dev,
 236                    int *idx)
 237 {
 238         struct dsa_port *dp = dsa_slave_to_port(dev);
 239         struct dsa_slave_dump_ctx dump = {
 240                 .dev = dev,
 241                 .skb = skb,
 242                 .cb = cb,
 243                 .idx = *idx,
 244         };
 245         int err;
 246
 247         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 248         *idx = dump.idx;
 249
 250         return err;
 251 }
 252
 253 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 254 {
 255         struct dsa_slave_priv *p = netdev_priv(dev);
 256         struct dsa_switch *ds = p->dp->ds;
 257         int port = p->dp->index;
 258
 259         /* Pass through to switch driver if it supports timestamping */
 260         switch (cmd) {
 261         case SIOCGHWTSTAMP:
 262                 if (ds->ops->port_hwtstamp_get)
 263                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 264                 break;
 265         case SIOCSHWTSTAMP:
 266                 if (ds->ops->port_hwtstamp_set)
 267                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 268                 break;
 269         }
 270
 271         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 272 }
 273
 274 static int dsa_slave_port_attr_set(struct net_device *dev,
 275                                    const struct switchdev_attr *attr,
 276                                    struct netlink_ext_ack *extack)
 277 {
 278         struct dsa_port *dp = dsa_slave_to_port(dev);
 279         int ret;
 280
 281         if (!dsa_port_offloads_netdev(dp, attr->orig_dev))
 282                 return -EOPNOTSUPP;
 283
 284         switch (attr->id) {
 285         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 286                 ret = dsa_port_set_state(dp, attr->u.stp_state);
 287                 break;
 288         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 289                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 290                                               extack);
 291                 break;
 292         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 293                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 294                 break;
 295         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 296                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 297                                                 extack);
 298                 break;
 299         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 300                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 301                 break;
 302         case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 303                 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, extack);
 304                 break;
 305         default:
 306                 ret = -EOPNOTSUPP;
 307                 break;
 308         }
 309
 310         return ret;
 311 }
 312
 313 /* Must be called under rcu_read_lock() */
 314 static int
 315 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 316                                       const struct switchdev_obj_port_vlan *vlan)
 317 {
 318         struct net_device *upper_dev;
 319         struct list_head *iter;
 320
 321         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 322                 u16 vid;
 323
 324                 if (!is_vlan_dev(upper_dev))
 325                         continue;
 326
 327                 vid = vlan_dev_vlan_id(upper_dev);
 328                 if (vid == vlan->vid)
 329                         return -EBUSY;
 330         }
 331
 332         return 0;
 333 }
 334
 335 static int dsa_slave_vlan_add(struct net_device *dev,
 336                               const struct switchdev_obj *obj,
 337                               struct netlink_ext_ack *extack)
 338 {
 339         struct net_device *master = dsa_slave_to_master(dev);
 340         struct dsa_port *dp = dsa_slave_to_port(dev);
 341         struct switchdev_obj_port_vlan vlan;
 342         int err;
 343
 344         if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 345                 return -EOPNOTSUPP;
 346
 347         if (dsa_port_skip_vlan_configuration(dp)) {
 348                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 349                 return 0;
 350         }
 351
 352         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 353
 354         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 355          * the same VID.
 356          */
 357         if (br_vlan_enabled(dp->bridge_dev)) {
 358                 rcu_read_lock();
 359                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
 360                 rcu_read_unlock();
 361                 if (err) {
 362                         NL_SET_ERR_MSG_MOD(extack,
 363                                            "Port already has a VLAN upper with this VID");
 364                         return err;
 365                 }
 366         }
 367
 368         err = dsa_port_vlan_add(dp, &vlan, extack);
 369         if (err)
 370                 return err;
 371
 372         /* We need the dedicated CPU port to be a member of the VLAN as well.
 373          * Even though drivers often handle CPU membership in special ways,
 374          * it doesn't make sense to program a PVID, so clear this flag.
 375          */
 376         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 377
 378         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, extack);
 379         if (err)
 380                 return err;
 381
 382         return vlan_vid_add(master, htons(ETH_P_8021Q), vlan.vid);
 383 }
 384
 385 static int dsa_slave_port_obj_add(struct net_device *dev,
 386                                   const struct switchdev_obj *obj,
 387                                   struct netlink_ext_ack *extack)
 388 {
 389         struct dsa_port *dp = dsa_slave_to_port(dev);
 390         int err;
 391
 392         switch (obj->id) {
 393         case SWITCHDEV_OBJ_ID_PORT_MDB:
 394                 if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 395                         return -EOPNOTSUPP;
 396                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 397                 break;
 398         case SWITCHDEV_OBJ_ID_HOST_MDB:
 399                 /* DSA can directly translate this to a normal MDB add,
 400                  * but on the CPU port.
 401                  */
 402                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 403                 break;
 404         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 405                 err = dsa_slave_vlan_add(dev, obj, extack);
 406                 break;
 407         default:
 408                 err = -EOPNOTSUPP;
 409                 break;
 410         }
 411
 412         return err;
 413 }
 414
 415 static int dsa_slave_vlan_del(struct net_device *dev,
 416                               const struct switchdev_obj *obj)
 417 {
 418         struct net_device *master = dsa_slave_to_master(dev);
 419         struct dsa_port *dp = dsa_slave_to_port(dev);
 420         struct switchdev_obj_port_vlan *vlan;
 421         int err;
 422
 423         if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 424                 return -EOPNOTSUPP;
 425
 426         if (dsa_port_skip_vlan_configuration(dp))
 427                 return 0;
 428
 429         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 430
 431         /* Do not deprogram the CPU port as it may be shared with other user
 432          * ports which can be members of this VLAN as well.
 433          */
 434         err = dsa_port_vlan_del(dp, vlan);
 435         if (err)
 436                 return err;
 437
 438         vlan_vid_del(master, htons(ETH_P_8021Q), vlan->vid);
 439
 440         return 0;
 441 }
 442
 443 static int dsa_slave_port_obj_del(struct net_device *dev,
 444                                   const struct switchdev_obj *obj)
 445 {
 446         struct dsa_port *dp = dsa_slave_to_port(dev);
 447         int err;
 448
 449         switch (obj->id) {
 450         case SWITCHDEV_OBJ_ID_PORT_MDB:
 451                 if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
 452                         return -EOPNOTSUPP;
 453                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 454                 break;
 455         case SWITCHDEV_OBJ_ID_HOST_MDB:
 456                 /* DSA can directly translate this to a normal MDB add,
 457                  * but on the CPU port.
 458                  */
 459                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 460                 break;
 461         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 462                 err = dsa_slave_vlan_del(dev, obj);
 463                 break;
 464         default:
 465                 err = -EOPNOTSUPP;
 466                 break;
 467         }
 468
 469         return err;
 470 }
 471
 472 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 473                                         struct netdev_phys_item_id *ppid)
 474 {
 475         struct dsa_port *dp = dsa_slave_to_port(dev);
 476         struct dsa_switch *ds = dp->ds;
 477         struct dsa_switch_tree *dst = ds->dst;
 478
 479         /* For non-legacy ports, devlink is used and it takes
 480          * care of the name generation. This ndo implementation
 481          * should be removed with legacy support.
 482          */
 483         if (dp->ds->devlink)
 484                 return -EOPNOTSUPP;
 485
 486         ppid->id_len = sizeof(dst->index);
 487         memcpy(&ppid->id, &dst->index, ppid->id_len);
 488
 489         return 0;
 490 }
 491
 492 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 493                                                      struct sk_buff *skb)
 494 {
 495 #ifdef CONFIG_NET_POLL_CONTROLLER
 496         struct dsa_slave_priv *p = netdev_priv(dev);
 497
 498         return netpoll_send_skb(p->netpoll, skb);
 499 #else
 500         BUG();
 501         return NETDEV_TX_OK;
 502 #endif
 503 }
 504
 505 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 506                                  struct sk_buff *skb)
 507 {
 508         struct dsa_switch *ds = p->dp->ds;
 509         struct sk_buff *clone;
 510         unsigned int type;
 511
 512         type = ptp_classify_raw(skb);
 513         if (type == PTP_CLASS_NONE)
 514                 return;
 515
 516         if (!ds->ops->port_txtstamp)
 517                 return;
 518
 519         clone = skb_clone_sk(skb);
 520         if (!clone)
 521                 return;
 522
 523         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type)) {
 524                 DSA_SKB_CB(skb)->clone = clone;
 525                 return;
 526         }
 527
 528         kfree_skb(clone);
 529 }
 530
 531 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 532 {
 533         /* SKB for netpoll still need to be mangled with the protocol-specific
 534          * tag to be successfully transmitted
 535          */
 536         if (unlikely(netpoll_tx_running(dev)))
 537                 return dsa_slave_netpoll_send_skb(dev, skb);
 538
 539         /* Queue the SKB for transmission on the parent interface, but
 540          * do not modify its EtherType
 541          */
 542         skb->dev = dsa_slave_to_master(dev);
 543         dev_queue_xmit(skb);
 544
 545         return NETDEV_TX_OK;
 546 }
 547 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 548
 549 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 550 {
 551         int needed_headroom = dev->needed_headroom;
 552         int needed_tailroom = dev->needed_tailroom;
 553
 554         /* For tail taggers, we need to pad short frames ourselves, to ensure
 555          * that the tail tag does not fail at its role of being at the end of
 556          * the packet, once the master interface pads the frame. Account for
 557          * that pad length here, and pad later.
 558          */
 559         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 560                 needed_tailroom += ETH_ZLEN - skb->len;
 561         /* skb_headroom() returns unsigned int... */
 562         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 563         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 564
 565         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 566                 /* No reallocation needed, yay! */
 567                 return 0;
 568
 569         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 570                                 GFP_ATOMIC);
 571 }
 572
 573 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 574 {
 575         struct dsa_slave_priv *p = netdev_priv(dev);
 576         struct sk_buff *nskb;
 577
 578         dev_sw_netstats_tx_add(dev, 1, skb->len);
 579
 580         DSA_SKB_CB(skb)->clone = NULL;
 581
 582         /* Identify PTP protocol packets, clone them, and pass them to the
 583          * switch driver
 584          */
 585         dsa_skb_tx_timestamp(p, skb);
 586
 587         if (dsa_realloc_skb(skb, dev)) {
 588                 dev_kfree_skb_any(skb);
 589                 return NETDEV_TX_OK;
 590         }
 591
 592         /* needed_tailroom should still be 'warm' in the cache line from
 593          * dsa_realloc_skb(), which has also ensured that padding is safe.
 594          */
 595         if (dev->needed_tailroom)
 596                 eth_skb_pad(skb);
 597
 598         /* Transmit function may have to reallocate the original SKB,
 599          * in which case it must have freed it. Only free it here on error.
 600          */
 601         nskb = p->xmit(skb, dev);
 602         if (!nskb) {
 603                 kfree_skb(skb);
 604                 return NETDEV_TX_OK;
 605         }
 606
 607         return dsa_enqueue_skb(nskb, dev);
 608 }
 609
 610 /* ethtool operations *******************************************************/
 611
 612 static void dsa_slave_get_drvinfo(struct net_device *dev,
 613                                   struct ethtool_drvinfo *drvinfo)
 614 {
 615         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 616         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 617         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 618 }
 619
 620 static int dsa_slave_get_regs_len(struct net_device *dev)
 621 {
 622         struct dsa_port *dp = dsa_slave_to_port(dev);
 623         struct dsa_switch *ds = dp->ds;
 624
 625         if (ds->ops->get_regs_len)
 626                 return ds->ops->get_regs_len(ds, dp->index);
 627
 628         return -EOPNOTSUPP;
 629 }
 630
 631 static void
 632 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 633 {
 634         struct dsa_port *dp = dsa_slave_to_port(dev);
 635         struct dsa_switch *ds = dp->ds;
 636
 637         if (ds->ops->get_regs)
 638                 ds->ops->get_regs(ds, dp->index, regs, _p);
 639 }
 640
 641 static int dsa_slave_nway_reset(struct net_device *dev)
 642 {
 643         struct dsa_port *dp = dsa_slave_to_port(dev);
 644
 645         return phylink_ethtool_nway_reset(dp->pl);
 646 }
 647
 648 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 649 {
 650         struct dsa_port *dp = dsa_slave_to_port(dev);
 651         struct dsa_switch *ds = dp->ds;
 652
 653         if (ds->cd && ds->cd->eeprom_len)
 654                 return ds->cd->eeprom_len;
 655
 656         if (ds->ops->get_eeprom_len)
 657                 return ds->ops->get_eeprom_len(ds);
 658
 659         return 0;
 660 }
 661
 662 static int dsa_slave_get_eeprom(struct net_device *dev,
 663                                 struct ethtool_eeprom *eeprom, u8 *data)
 664 {
 665         struct dsa_port *dp = dsa_slave_to_port(dev);
 666         struct dsa_switch *ds = dp->ds;
 667
 668         if (ds->ops->get_eeprom)
 669                 return ds->ops->get_eeprom(ds, eeprom, data);
 670
 671         return -EOPNOTSUPP;
 672 }
 673
 674 static int dsa_slave_set_eeprom(struct net_device *dev,
 675                                 struct ethtool_eeprom *eeprom, u8 *data)
 676 {
 677         struct dsa_port *dp = dsa_slave_to_port(dev);
 678         struct dsa_switch *ds = dp->ds;
 679
 680         if (ds->ops->set_eeprom)
 681                 return ds->ops->set_eeprom(ds, eeprom, data);
 682
 683         return -EOPNOTSUPP;
 684 }
 685
 686 static void dsa_slave_get_strings(struct net_device *dev,
 687                                   uint32_t stringset, uint8_t *data)
 688 {
 689         struct dsa_port *dp = dsa_slave_to_port(dev);
 690         struct dsa_switch *ds = dp->ds;
 691
 692         if (stringset == ETH_SS_STATS) {
 693                 int len = ETH_GSTRING_LEN;
 694
 695                 strncpy(data, "tx_packets", len);
 696                 strncpy(data + len, "tx_bytes", len);
 697                 strncpy(data + 2 * len, "rx_packets", len);
 698                 strncpy(data + 3 * len, "rx_bytes", len);
 699                 if (ds->ops->get_strings)
 700                         ds->ops->get_strings(ds, dp->index, stringset,
 701                                              data + 4 * len);
 702         }
 703 }
 704
 705 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 706                                         struct ethtool_stats *stats,
 707                                         uint64_t *data)
 708 {
 709         struct dsa_port *dp = dsa_slave_to_port(dev);
 710         struct dsa_switch *ds = dp->ds;
 711         struct pcpu_sw_netstats *s;
 712         unsigned int start;
 713         int i;
 714
 715         for_each_possible_cpu(i) {
 716                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 717
 718                 s = per_cpu_ptr(dev->tstats, i);
 719                 do {
 720                         start = u64_stats_fetch_begin_irq(&s->syncp);
 721                         tx_packets = s->tx_packets;
 722                         tx_bytes = s->tx_bytes;
 723                         rx_packets = s->rx_packets;
 724                         rx_bytes = s->rx_bytes;
 725                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 726                 data[0] += tx_packets;
 727                 data[1] += tx_bytes;
 728                 data[2] += rx_packets;
 729                 data[3] += rx_bytes;
 730         }
 731         if (ds->ops->get_ethtool_stats)
 732                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 733 }
 734
 735 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 736 {
 737         struct dsa_port *dp = dsa_slave_to_port(dev);
 738         struct dsa_switch *ds = dp->ds;
 739
 740         if (sset == ETH_SS_STATS) {
 741                 int count;
 742
 743                 count = 4;
 744                 if (ds->ops->get_sset_count)
 745                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 746
 747                 return count;
 748         }
 749
 750         return -EOPNOTSUPP;
 751 }
 752
 753 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 754 {
 755         struct dsa_port *dp = dsa_slave_to_port(dev);
 756         struct dsa_switch *ds = dp->ds;
 757
 758         phylink_ethtool_get_wol(dp->pl, w);
 759
 760         if (ds->ops->get_wol)
 761                 ds->ops->get_wol(ds, dp->index, w);
 762 }
 763
 764 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 765 {
 766         struct dsa_port *dp = dsa_slave_to_port(dev);
 767         struct dsa_switch *ds = dp->ds;
 768         int ret = -EOPNOTSUPP;
 769
 770         phylink_ethtool_set_wol(dp->pl, w);
 771
 772         if (ds->ops->set_wol)
 773                 ret = ds->ops->set_wol(ds, dp->index, w);
 774
 775         return ret;
 776 }
 777
 778 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 779 {
 780         struct dsa_port *dp = dsa_slave_to_port(dev);
 781         struct dsa_switch *ds = dp->ds;
 782         int ret;
 783
 784         /* Port's PHY and MAC both need to be EEE capable */
 785         if (!dev->phydev || !dp->pl)
 786                 return -ENODEV;
 787
 788         if (!ds->ops->set_mac_eee)
 789                 return -EOPNOTSUPP;
 790
 791         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 792         if (ret)
 793                 return ret;
 794
 795         return phylink_ethtool_set_eee(dp->pl, e);
 796 }
 797
 798 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 799 {
 800         struct dsa_port *dp = dsa_slave_to_port(dev);
 801         struct dsa_switch *ds = dp->ds;
 802         int ret;
 803
 804         /* Port's PHY and MAC both need to be EEE capable */
 805         if (!dev->phydev || !dp->pl)
 806                 return -ENODEV;
 807
 808         if (!ds->ops->get_mac_eee)
 809                 return -EOPNOTSUPP;
 810
 811         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 812         if (ret)
 813                 return ret;
 814
 815         return phylink_ethtool_get_eee(dp->pl, e);
 816 }
 817
 818 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 819                                         struct ethtool_link_ksettings *cmd)
 820 {
 821         struct dsa_port *dp = dsa_slave_to_port(dev);
 822
 823         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 824 }
 825
 826 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 827                                         const struct ethtool_link_ksettings *cmd)
 828 {
 829         struct dsa_port *dp = dsa_slave_to_port(dev);
 830
 831         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 832 }
 833
 834 static void dsa_slave_get_pauseparam(struct net_device *dev,
 835                                      struct ethtool_pauseparam *pause)
 836 {
 837         struct dsa_port *dp = dsa_slave_to_port(dev);
 838
 839         phylink_ethtool_get_pauseparam(dp->pl, pause);
 840 }
 841
 842 static int dsa_slave_set_pauseparam(struct net_device *dev,
 843                                     struct ethtool_pauseparam *pause)
 844 {
 845         struct dsa_port *dp = dsa_slave_to_port(dev);
 846
 847         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 848 }
 849
 850 #ifdef CONFIG_NET_POLL_CONTROLLER
 851 static int dsa_slave_netpoll_setup(struct net_device *dev,
 852                                    struct netpoll_info *ni)
 853 {
 854         struct net_device *master = dsa_slave_to_master(dev);
 855         struct dsa_slave_priv *p = netdev_priv(dev);
 856         struct netpoll *netpoll;
 857         int err = 0;
 858
 859         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 860         if (!netpoll)
 861                 return -ENOMEM;
 862
 863         err = __netpoll_setup(netpoll, master);
 864         if (err) {
 865                 kfree(netpoll);
 866                 goto out;
 867         }
 868
 869         p->netpoll = netpoll;
 870 out:
 871         return err;
 872 }
 873
 874 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 875 {
 876         struct dsa_slave_priv *p = netdev_priv(dev);
 877         struct netpoll *netpoll = p->netpoll;
 878
 879         if (!netpoll)
 880                 return;
 881
 882         p->netpoll = NULL;
 883
 884         __netpoll_free(netpoll);
 885 }
 886
 887 static void dsa_slave_poll_controller(struct net_device *dev)
 888 {
 889 }
 890 #endif
 891
 892 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 893                                         char *name, size_t len)
 894 {
 895         struct dsa_port *dp = dsa_slave_to_port(dev);
 896
 897         /* For non-legacy ports, devlink is used and it takes
 898          * care of the name generation. This ndo implementation
 899          * should be removed with legacy support.
 900          */
 901         if (dp->ds->devlink)
 902                 return -EOPNOTSUPP;
 903
 904         if (snprintf(name, len, "p%d", dp->index) >= len)
 905                 return -EINVAL;
 906
 907         return 0;
 908 }
 909
 910 static struct dsa_mall_tc_entry *
 911 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 912 {
 913         struct dsa_slave_priv *p = netdev_priv(dev);
 914         struct dsa_mall_tc_entry *mall_tc_entry;
 915
 916         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 917                 if (mall_tc_entry->cookie == cookie)
 918                         return mall_tc_entry;
 919
 920         return NULL;
 921 }
 922
 923 static int
 924 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 925                                   struct tc_cls_matchall_offload *cls,
 926                                   bool ingress)
 927 {
 928         struct dsa_port *dp = dsa_slave_to_port(dev);
 929         struct dsa_slave_priv *p = netdev_priv(dev);
 930         struct dsa_mall_mirror_tc_entry *mirror;
 931         struct dsa_mall_tc_entry *mall_tc_entry;
 932         struct dsa_switch *ds = dp->ds;
 933         struct flow_action_entry *act;
 934         struct dsa_port *to_dp;
 935         int err;
 936
 937         if (!ds->ops->port_mirror_add)
 938                 return -EOPNOTSUPP;
 939
 940         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 941                                               cls->common.extack))
 942                 return -EOPNOTSUPP;
 943
 944         act = &cls->rule->action.entries[0];
 945
 946         if (!act->dev)
 947                 return -EINVAL;
 948
 949         if (!dsa_slave_dev_check(act->dev))
 950                 return -EOPNOTSUPP;
 951
 952         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 953         if (!mall_tc_entry)
 954                 return -ENOMEM;
 955
 956         mall_tc_entry->cookie = cls->cookie;
 957         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 958         mirror = &mall_tc_entry->mirror;
 959
 960         to_dp = dsa_slave_to_port(act->dev);
 961
 962         mirror->to_local_port = to_dp->index;
 963         mirror->ingress = ingress;
 964
 965         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 966         if (err) {
 967                 kfree(mall_tc_entry);
 968                 return err;
 969         }
 970
 971         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 972
 973         return err;
 974 }
 975
 976 static int
 977 dsa_slave_add_cls_matchall_police(struct net_device *dev,
 978                                   struct tc_cls_matchall_offload *cls,
 979                                   bool ingress)
 980 {
 981         struct netlink_ext_ack *extack = cls->common.extack;
 982         struct dsa_port *dp = dsa_slave_to_port(dev);
 983         struct dsa_slave_priv *p = netdev_priv(dev);
 984         struct dsa_mall_policer_tc_entry *policer;
 985         struct dsa_mall_tc_entry *mall_tc_entry;
 986         struct dsa_switch *ds = dp->ds;
 987         struct flow_action_entry *act;
 988         int err;
 989
 990         if (!ds->ops->port_policer_add) {
 991                 NL_SET_ERR_MSG_MOD(extack,
 992                                    "Policing offload not implemented");
 993                 return -EOPNOTSUPP;
 994         }
 995
 996         if (!ingress) {
 997                 NL_SET_ERR_MSG_MOD(extack,
 998                                    "Only supported on ingress qdisc");
 999                 return -EOPNOTSUPP;
1000         }
1001
1002         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1003                                               cls->common.extack))
1004                 return -EOPNOTSUPP;
1005
1006         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1007                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1008                         NL_SET_ERR_MSG_MOD(extack,
1009                                            "Only one port policer allowed");
1010                         return -EEXIST;
1011                 }
1012         }
1013
1014         act = &cls->rule->action.entries[0];
1015
1016         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1017         if (!mall_tc_entry)
1018                 return -ENOMEM;
1019
1020         mall_tc_entry->cookie = cls->cookie;
1021         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1022         policer = &mall_tc_entry->policer;
1023         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1024         policer->burst = act->police.burst;
1025
1026         err = ds->ops->port_policer_add(ds, dp->index, policer);
1027         if (err) {
1028                 kfree(mall_tc_entry);
1029                 return err;
1030         }
1031
1032         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1033
1034         return err;
1035 }
1036
1037 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1038                                       struct tc_cls_matchall_offload *cls,
1039                                       bool ingress)
1040 {
1041         int err = -EOPNOTSUPP;
1042
1043         if (cls->common.protocol == htons(ETH_P_ALL) &&
1044             flow_offload_has_one_action(&cls->rule->action) &&
1045             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1046                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1047         else if (flow_offload_has_one_action(&cls->rule->action) &&
1048                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1049                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1050
1051         return err;
1052 }
1053
1054 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1055                                        struct tc_cls_matchall_offload *cls)
1056 {
1057         struct dsa_port *dp = dsa_slave_to_port(dev);
1058         struct dsa_mall_tc_entry *mall_tc_entry;
1059         struct dsa_switch *ds = dp->ds;
1060
1061         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1062         if (!mall_tc_entry)
1063                 return;
1064
1065         list_del(&mall_tc_entry->list);
1066
1067         switch (mall_tc_entry->type) {
1068         case DSA_PORT_MALL_MIRROR:
1069                 if (ds->ops->port_mirror_del)
1070                         ds->ops->port_mirror_del(ds, dp->index,
1071                                                  &mall_tc_entry->mirror);
1072                 break;
1073         case DSA_PORT_MALL_POLICER:
1074                 if (ds->ops->port_policer_del)
1075                         ds->ops->port_policer_del(ds, dp->index);
1076                 break;
1077         default:
1078                 WARN_ON(1);
1079         }
1080
1081         kfree(mall_tc_entry);
1082 }
1083
1084 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1085                                            struct tc_cls_matchall_offload *cls,
1086                                            bool ingress)
1087 {
1088         if (cls->common.chain_index)
1089                 return -EOPNOTSUPP;
1090
1091         switch (cls->command) {
1092         case TC_CLSMATCHALL_REPLACE:
1093                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1094         case TC_CLSMATCHALL_DESTROY:
1095                 dsa_slave_del_cls_matchall(dev, cls);
1096                 return 0;
1097         default:
1098                 return -EOPNOTSUPP;
1099         }
1100 }
1101
1102 static int dsa_slave_add_cls_flower(struct net_device *dev,
1103                                     struct flow_cls_offload *cls,
1104                                     bool ingress)
1105 {
1106         struct dsa_port *dp = dsa_slave_to_port(dev);
1107         struct dsa_switch *ds = dp->ds;
1108         int port = dp->index;
1109
1110         if (!ds->ops->cls_flower_add)
1111                 return -EOPNOTSUPP;
1112
1113         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1114 }
1115
1116 static int dsa_slave_del_cls_flower(struct net_device *dev,
1117                                     struct flow_cls_offload *cls,
1118                                     bool ingress)
1119 {
1120         struct dsa_port *dp = dsa_slave_to_port(dev);
1121         struct dsa_switch *ds = dp->ds;
1122         int port = dp->index;
1123
1124         if (!ds->ops->cls_flower_del)
1125                 return -EOPNOTSUPP;
1126
1127         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1128 }
1129
1130 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1131                                       struct flow_cls_offload *cls,
1132                                       bool ingress)
1133 {
1134         struct dsa_port *dp = dsa_slave_to_port(dev);
1135         struct dsa_switch *ds = dp->ds;
1136         int port = dp->index;
1137
1138         if (!ds->ops->cls_flower_stats)
1139                 return -EOPNOTSUPP;
1140
1141         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1142 }
1143
1144 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1145                                          struct flow_cls_offload *cls,
1146                                          bool ingress)
1147 {
1148         switch (cls->command) {
1149         case FLOW_CLS_REPLACE:
1150                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1151         case FLOW_CLS_DESTROY:
1152                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1153         case FLOW_CLS_STATS:
1154                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1155         default:
1156                 return -EOPNOTSUPP;
1157         }
1158 }
1159
1160 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1161                                        void *cb_priv, bool ingress)
1162 {
1163         struct net_device *dev = cb_priv;
1164
1165         if (!tc_can_offload(dev))
1166                 return -EOPNOTSUPP;
1167
1168         switch (type) {
1169         case TC_SETUP_CLSMATCHALL:
1170                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1171         case TC_SETUP_CLSFLOWER:
1172                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1173         default:
1174                 return -EOPNOTSUPP;
1175         }
1176 }
1177
1178 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1179                                           void *type_data, void *cb_priv)
1180 {
1181         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1182 }
1183
1184 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1185                                           void *type_data, void *cb_priv)
1186 {
1187         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1188 }
1189
1190 static LIST_HEAD(dsa_slave_block_cb_list);
1191
1192 static int dsa_slave_setup_tc_block(struct net_device *dev,
1193                                     struct flow_block_offload *f)
1194 {
1195         struct flow_block_cb *block_cb;
1196         flow_setup_cb_t *cb;
1197
1198         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1199                 cb = dsa_slave_setup_tc_block_cb_ig;
1200         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1201                 cb = dsa_slave_setup_tc_block_cb_eg;
1202         else
1203                 return -EOPNOTSUPP;
1204
1205         f->driver_block_list = &dsa_slave_block_cb_list;
1206
1207         switch (f->command) {
1208         case FLOW_BLOCK_BIND:
1209                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1210                         return -EBUSY;
1211
1212                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1213                 if (IS_ERR(block_cb))
1214                         return PTR_ERR(block_cb);
1215
1216                 flow_block_cb_add(block_cb, f);
1217                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1218                 return 0;
1219         case FLOW_BLOCK_UNBIND:
1220                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1221                 if (!block_cb)
1222                         return -ENOENT;
1223
1224                 flow_block_cb_remove(block_cb, f);
1225                 list_del(&block_cb->driver_list);
1226                 return 0;
1227         default:
1228                 return -EOPNOTSUPP;
1229         }
1230 }
1231
1232 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1233                               void *type_data)
1234 {
1235         struct dsa_port *dp = dsa_slave_to_port(dev);
1236         struct dsa_switch *ds = dp->ds;
1237
1238         if (type == TC_SETUP_BLOCK)
1239                 return dsa_slave_setup_tc_block(dev, type_data);
1240
1241         if (!ds->ops->port_setup_tc)
1242                 return -EOPNOTSUPP;
1243
1244         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1245 }
1246
1247 static int dsa_slave_get_rxnfc(struct net_device *dev,
1248                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1249 {
1250         struct dsa_port *dp = dsa_slave_to_port(dev);
1251         struct dsa_switch *ds = dp->ds;
1252
1253         if (!ds->ops->get_rxnfc)
1254                 return -EOPNOTSUPP;
1255
1256         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1257 }
1258
1259 static int dsa_slave_set_rxnfc(struct net_device *dev,
1260                                struct ethtool_rxnfc *nfc)
1261 {
1262         struct dsa_port *dp = dsa_slave_to_port(dev);
1263         struct dsa_switch *ds = dp->ds;
1264
1265         if (!ds->ops->set_rxnfc)
1266                 return -EOPNOTSUPP;
1267
1268         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1269 }
1270
1271 static int dsa_slave_get_ts_info(struct net_device *dev,
1272                                  struct ethtool_ts_info *ts)
1273 {
1274         struct dsa_slave_priv *p = netdev_priv(dev);
1275         struct dsa_switch *ds = p->dp->ds;
1276
1277         if (!ds->ops->get_ts_info)
1278                 return -EOPNOTSUPP;
1279
1280         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1281 }
1282
1283 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1284                                      u16 vid)
1285 {
1286         struct net_device *master = dsa_slave_to_master(dev);
1287         struct dsa_port *dp = dsa_slave_to_port(dev);
1288         struct switchdev_obj_port_vlan vlan = {
1289                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1290                 .vid = vid,
1291                 /* This API only allows programming tagged, non-PVID VIDs */
1292                 .flags = 0,
1293         };
1294         struct netlink_ext_ack extack = {0};
1295         int ret;
1296
1297         /* User port... */
1298         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1299         if (ret) {
1300                 if (extack._msg)
1301                         netdev_err(dev, "%s\n", extack._msg);
1302                 return ret;
1303         }
1304
1305         /* And CPU port... */
1306         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &extack);
1307         if (ret) {
1308                 if (extack._msg)
1309                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1310                                    extack._msg);
1311                 return ret;
1312         }
1313
1314         return vlan_vid_add(master, proto, vid);
1315 }
1316
1317 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1318                                       u16 vid)
1319 {
1320         struct net_device *master = dsa_slave_to_master(dev);
1321         struct dsa_port *dp = dsa_slave_to_port(dev);
1322         struct switchdev_obj_port_vlan vlan = {
1323                 .vid = vid,
1324                 /* This API only allows programming tagged, non-PVID VIDs */
1325                 .flags = 0,
1326         };
1327         int err;
1328
1329         /* Do not deprogram the CPU port as it may be shared with other user
1330          * ports which can be members of this VLAN as well.
1331          */
1332         err = dsa_port_vlan_del(dp, &vlan);
1333         if (err)
1334                 return err;
1335
1336         vlan_vid_del(master, proto, vid);
1337
1338         return 0;
1339 }
1340
1341 struct dsa_hw_port {
1342         struct list_head list;
1343         struct net_device *dev;
1344         int old_mtu;
1345 };
1346
1347 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1348 {
1349         const struct dsa_hw_port *p;
1350         int err;
1351
1352         list_for_each_entry(p, hw_port_list, list) {
1353                 if (p->dev->mtu == mtu)
1354                         continue;
1355
1356                 err = dev_set_mtu(p->dev, mtu);
1357                 if (err)
1358                         goto rollback;
1359         }
1360
1361         return 0;
1362
1363 rollback:
1364         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1365                 if (p->dev->mtu == p->old_mtu)
1366                         continue;
1367
1368                 if (dev_set_mtu(p->dev, p->old_mtu))
1369                         netdev_err(p->dev, "Failed to restore MTU\n");
1370         }
1371
1372         return err;
1373 }
1374
1375 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1376 {
1377         struct dsa_hw_port *p, *n;
1378
1379         list_for_each_entry_safe(p, n, hw_port_list, list)
1380                 kfree(p);
1381 }
1382
1383 /* Make the hardware datapath to/from @dev limited to a common MTU */
1384 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1385 {
1386         struct list_head hw_port_list;
1387         struct dsa_switch_tree *dst;
1388         int min_mtu = ETH_MAX_MTU;
1389         struct dsa_port *other_dp;
1390         int err;
1391
1392         if (!dp->ds->mtu_enforcement_ingress)
1393                 return;
1394
1395         if (!dp->bridge_dev)
1396                 return;
1397
1398         INIT_LIST_HEAD(&hw_port_list);
1399
1400         /* Populate the list of ports that are part of the same bridge
1401          * as the newly added/modified port
1402          */
1403         list_for_each_entry(dst, &dsa_tree_list, list) {
1404                 list_for_each_entry(other_dp, &dst->ports, list) {
1405                         struct dsa_hw_port *hw_port;
1406                         struct net_device *slave;
1407
1408                         if (other_dp->type != DSA_PORT_TYPE_USER)
1409                                 continue;
1410
1411                         if (other_dp->bridge_dev != dp->bridge_dev)
1412                                 continue;
1413
1414                         if (!other_dp->ds->mtu_enforcement_ingress)
1415                                 continue;
1416
1417                         slave = other_dp->slave;
1418
1419                         if (min_mtu > slave->mtu)
1420                                 min_mtu = slave->mtu;
1421
1422                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1423                         if (!hw_port)
1424                                 goto out;
1425
1426                         hw_port->dev = slave;
1427                         hw_port->old_mtu = slave->mtu;
1428
1429                         list_add(&hw_port->list, &hw_port_list);
1430                 }
1431         }
1432
1433         /* Attempt to configure the entire hardware bridge to the newly added
1434          * interface's MTU first, regardless of whether the intention of the
1435          * user was to raise or lower it.
1436          */
1437         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1438         if (!err)
1439                 goto out;
1440
1441         /* Clearly that didn't work out so well, so just set the minimum MTU on
1442          * all hardware bridge ports now. If this fails too, then all ports will
1443          * still have their old MTU rolled back anyway.
1444          */
1445         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1446
1447 out:
1448         dsa_hw_port_list_free(&hw_port_list);
1449 }
1450
1451 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1452 {
1453         struct net_device *master = dsa_slave_to_master(dev);
1454         struct dsa_port *dp = dsa_slave_to_port(dev);
1455         struct dsa_slave_priv *p = netdev_priv(dev);
1456         struct dsa_switch *ds = p->dp->ds;
1457         struct dsa_port *cpu_dp;
1458         int port = p->dp->index;
1459         int largest_mtu = 0;
1460         int new_master_mtu;
1461         int old_master_mtu;
1462         int mtu_limit;
1463         int cpu_mtu;
1464         int err, i;
1465
1466         if (!ds->ops->port_change_mtu)
1467                 return -EOPNOTSUPP;
1468
1469         for (i = 0; i < ds->num_ports; i++) {
1470                 int slave_mtu;
1471
1472                 if (!dsa_is_user_port(ds, i))
1473                         continue;
1474
1475                 /* During probe, this function will be called for each slave
1476                  * device, while not all of them have been allocated. That's
1477                  * ok, it doesn't change what the maximum is, so ignore it.
1478                  */
1479                 if (!dsa_to_port(ds, i)->slave)
1480                         continue;
1481
1482                 /* Pretend that we already applied the setting, which we
1483                  * actually haven't (still haven't done all integrity checks)
1484                  */
1485                 if (i == port)
1486                         slave_mtu = new_mtu;
1487                 else
1488                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1489
1490                 if (largest_mtu < slave_mtu)
1491                         largest_mtu = slave_mtu;
1492         }
1493
1494         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1495
1496         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1497         old_master_mtu = master->mtu;
1498         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1499         if (new_master_mtu > mtu_limit)
1500                 return -ERANGE;
1501
1502         /* If the master MTU isn't over limit, there's no need to check the CPU
1503          * MTU, since that surely isn't either.
1504          */
1505         cpu_mtu = largest_mtu;
1506
1507         /* Start applying stuff */
1508         if (new_master_mtu != old_master_mtu) {
1509                 err = dev_set_mtu(master, new_master_mtu);
1510                 if (err < 0)
1511                         goto out_master_failed;
1512
1513                 /* We only need to propagate the MTU of the CPU port to
1514                  * upstream switches.
1515                  */
1516                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1517                 if (err)
1518                         goto out_cpu_failed;
1519         }
1520
1521         err = dsa_port_mtu_change(dp, new_mtu, false);
1522         if (err)
1523                 goto out_port_failed;
1524
1525         dev->mtu = new_mtu;
1526
1527         dsa_bridge_mtu_normalization(dp);
1528
1529         return 0;
1530
1531 out_port_failed:
1532         if (new_master_mtu != old_master_mtu)
1533                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1534                                     cpu_dp->tag_ops->overhead,
1535                                     true);
1536 out_cpu_failed:
1537         if (new_master_mtu != old_master_mtu)
1538                 dev_set_mtu(master, old_master_mtu);
1539 out_master_failed:
1540         return err;
1541 }
1542
1543 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1544         .get_drvinfo            = dsa_slave_get_drvinfo,
1545         .get_regs_len           = dsa_slave_get_regs_len,
1546         .get_regs               = dsa_slave_get_regs,
1547         .nway_reset             = dsa_slave_nway_reset,
1548         .get_link               = ethtool_op_get_link,
1549         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1550         .get_eeprom             = dsa_slave_get_eeprom,
1551         .set_eeprom             = dsa_slave_set_eeprom,
1552         .get_strings            = dsa_slave_get_strings,
1553         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1554         .get_sset_count         = dsa_slave_get_sset_count,
1555         .set_wol                = dsa_slave_set_wol,
1556         .get_wol                = dsa_slave_get_wol,
1557         .set_eee                = dsa_slave_set_eee,
1558         .get_eee                = dsa_slave_get_eee,
1559         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1560         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1561         .get_pauseparam         = dsa_slave_get_pauseparam,
1562         .set_pauseparam         = dsa_slave_set_pauseparam,
1563         .get_rxnfc              = dsa_slave_get_rxnfc,
1564         .set_rxnfc              = dsa_slave_set_rxnfc,
1565         .get_ts_info            = dsa_slave_get_ts_info,
1566 };
1567
1568 /* legacy way, bypassing the bridge *****************************************/
1569 static int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1570                               struct net_device *dev,
1571                               const unsigned char *addr, u16 vid,
1572                               u16 flags,
1573                               struct netlink_ext_ack *extack)
1574 {
1575         struct dsa_port *dp = dsa_slave_to_port(dev);
1576
1577         return dsa_port_fdb_add(dp, addr, vid);
1578 }
1579
1580 static int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1581                               struct net_device *dev,
1582                               const unsigned char *addr, u16 vid)
1583 {
1584         struct dsa_port *dp = dsa_slave_to_port(dev);
1585
1586         return dsa_port_fdb_del(dp, addr, vid);
1587 }
1588
1589 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1590 {
1591         struct dsa_port *dp = dsa_slave_to_port(dev);
1592
1593         return dp->ds->devlink ? &dp->devlink_port : NULL;
1594 }
1595
1596 static void dsa_slave_get_stats64(struct net_device *dev,
1597                                   struct rtnl_link_stats64 *s)
1598 {
1599         struct dsa_port *dp = dsa_slave_to_port(dev);
1600         struct dsa_switch *ds = dp->ds;
1601
1602         if (ds->ops->get_stats64)
1603                 ds->ops->get_stats64(ds, dp->index, s);
1604         else
1605                 dev_get_tstats64(dev, s);
1606 }
1607
1608 static const struct net_device_ops dsa_slave_netdev_ops = {
1609         .ndo_open               = dsa_slave_open,
1610         .ndo_stop               = dsa_slave_close,
1611         .ndo_start_xmit         = dsa_slave_xmit,
1612         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1613         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1614         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1615         .ndo_fdb_add            = dsa_legacy_fdb_add,
1616         .ndo_fdb_del            = dsa_legacy_fdb_del,
1617         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1618         .ndo_do_ioctl           = dsa_slave_ioctl,
1619         .ndo_get_iflink         = dsa_slave_get_iflink,
1620 #ifdef CONFIG_NET_POLL_CONTROLLER
1621         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1622         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1623         .ndo_poll_controller    = dsa_slave_poll_controller,
1624 #endif
1625         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1626         .ndo_setup_tc           = dsa_slave_setup_tc,
1627         .ndo_get_stats64        = dsa_slave_get_stats64,
1628         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1629         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1630         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1631         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1632         .ndo_change_mtu         = dsa_slave_change_mtu,
1633 };
1634
1635 static struct device_type dsa_type = {
1636         .name   = "dsa",
1637 };
1638
1639 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1640 {
1641         const struct dsa_port *dp = dsa_to_port(ds, port);
1642
1643         if (dp->pl)
1644                 phylink_mac_change(dp->pl, up);
1645 }
1646 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1647
1648 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1649                                           struct phylink_link_state *state)
1650 {
1651         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1652         struct dsa_switch *ds = dp->ds;
1653
1654         /* No need to check that this operation is valid, the callback would
1655          * not be called if it was not.
1656          */
1657         ds->ops->phylink_fixed_state(ds, dp->index, state);
1658 }
1659
1660 /* slave device setup *******************************************************/
1661 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1662 {
1663         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1664         struct dsa_switch *ds = dp->ds;
1665
1666         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1667         if (!slave_dev->phydev) {
1668                 netdev_err(slave_dev, "no phy at %d\n", addr);
1669                 return -ENODEV;
1670         }
1671
1672         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1673 }
1674
1675 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1676 {
1677         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1678         struct device_node *port_dn = dp->dn;
1679         struct dsa_switch *ds = dp->ds;
1680         phy_interface_t mode;
1681         u32 phy_flags = 0;
1682         int ret;
1683
1684         ret = of_get_phy_mode(port_dn, &mode);
1685         if (ret)
1686                 mode = PHY_INTERFACE_MODE_NA;
1687
1688         dp->pl_config.dev = &slave_dev->dev;
1689         dp->pl_config.type = PHYLINK_NETDEV;
1690
1691         /* The get_fixed_state callback takes precedence over polling the
1692          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1693          * this if the switch provides such a callback.
1694          */
1695         if (ds->ops->phylink_fixed_state) {
1696                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1697                 dp->pl_config.poll_fixed_state = true;
1698         }
1699
1700         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1701                                 &dsa_port_phylink_mac_ops);
1702         if (IS_ERR(dp->pl)) {
1703                 netdev_err(slave_dev,
1704                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1705                 return PTR_ERR(dp->pl);
1706         }
1707
1708         if (ds->ops->get_phy_flags)
1709                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1710
1711         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1712         if (ret == -ENODEV && ds->slave_mii_bus) {
1713                 /* We could not connect to a designated PHY or SFP, so try to
1714                  * use the switch internal MDIO bus instead
1715                  */
1716                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1717                 if (ret) {
1718                         netdev_err(slave_dev,
1719                                    "failed to connect to port %d: %d\n",
1720                                    dp->index, ret);
1721                         phylink_destroy(dp->pl);
1722                         return ret;
1723                 }
1724         }
1725
1726         return ret;
1727 }
1728
1729 void dsa_slave_setup_tagger(struct net_device *slave)
1730 {
1731         struct dsa_port *dp = dsa_slave_to_port(slave);
1732         struct dsa_slave_priv *p = netdev_priv(slave);
1733         const struct dsa_port *cpu_dp = dp->cpu_dp;
1734         struct net_device *master = cpu_dp->master;
1735
1736         if (cpu_dp->tag_ops->tail_tag)
1737                 slave->needed_tailroom = cpu_dp->tag_ops->overhead;
1738         else
1739                 slave->needed_headroom = cpu_dp->tag_ops->overhead;
1740         /* Try to save one extra realloc later in the TX path (in the master)
1741          * by also inheriting the master's needed headroom and tailroom.
1742          * The 8021q driver also does this.
1743          */
1744         slave->needed_headroom += master->needed_headroom;
1745         slave->needed_tailroom += master->needed_tailroom;
1746
1747         p->xmit = cpu_dp->tag_ops->xmit;
1748 }
1749
1750 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1751 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1752                                             struct netdev_queue *txq,
1753                                             void *_unused)
1754 {
1755         lockdep_set_class(&txq->_xmit_lock,
1756                           &dsa_slave_netdev_xmit_lock_key);
1757 }
1758
1759 int dsa_slave_suspend(struct net_device *slave_dev)
1760 {
1761         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1762
1763         if (!netif_running(slave_dev))
1764                 return 0;
1765
1766         netif_device_detach(slave_dev);
1767
1768         rtnl_lock();
1769         phylink_stop(dp->pl);
1770         rtnl_unlock();
1771
1772         return 0;
1773 }
1774
1775 int dsa_slave_resume(struct net_device *slave_dev)
1776 {
1777         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1778
1779         if (!netif_running(slave_dev))
1780                 return 0;
1781
1782         netif_device_attach(slave_dev);
1783
1784         rtnl_lock();
1785         phylink_start(dp->pl);
1786         rtnl_unlock();
1787
1788         return 0;
1789 }
1790
1791 int dsa_slave_create(struct dsa_port *port)
1792 {
1793         const struct dsa_port *cpu_dp = port->cpu_dp;
1794         struct net_device *master = cpu_dp->master;
1795         struct dsa_switch *ds = port->ds;
1796         const char *name = port->name;
1797         struct net_device *slave_dev;
1798         struct dsa_slave_priv *p;
1799         int ret;
1800
1801         if (!ds->num_tx_queues)
1802                 ds->num_tx_queues = 1;
1803
1804         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1805                                      NET_NAME_UNKNOWN, ether_setup,
1806                                      ds->num_tx_queues, 1);
1807         if (slave_dev == NULL)
1808                 return -ENOMEM;
1809
1810         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1811         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1812                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1813         slave_dev->hw_features |= NETIF_F_HW_TC;
1814         slave_dev->features |= NETIF_F_LLTX;
1815         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1816         if (!IS_ERR_OR_NULL(port->mac))
1817                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1818         else
1819                 eth_hw_addr_inherit(slave_dev, master);
1820         slave_dev->priv_flags |= IFF_NO_QUEUE;
1821         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1822         if (ds->ops->port_max_mtu)
1823                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1824         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1825
1826         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1827                                  NULL);
1828
1829         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1830         slave_dev->dev.of_node = port->dn;
1831         slave_dev->vlan_features = master->vlan_features;
1832
1833         p = netdev_priv(slave_dev);
1834         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1835         if (!slave_dev->tstats) {
1836                 free_netdev(slave_dev);
1837                 return -ENOMEM;
1838         }
1839
1840         ret = gro_cells_init(&p->gcells, slave_dev);
1841         if (ret)
1842                 goto out_free;
1843
1844         p->dp = port;
1845         INIT_LIST_HEAD(&p->mall_tc_list);
1846         port->slave = slave_dev;
1847         dsa_slave_setup_tagger(slave_dev);
1848
1849         rtnl_lock();
1850         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1851         rtnl_unlock();
1852         if (ret && ret != -EOPNOTSUPP)
1853                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1854                          ret, ETH_DATA_LEN, port->index);
1855
1856         netif_carrier_off(slave_dev);
1857
1858         ret = dsa_slave_phy_setup(slave_dev);
1859         if (ret) {
1860                 netdev_err(slave_dev,
1861                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1862                            ret, ds->dst->index, ds->index, port->index);
1863                 goto out_gcells;
1864         }
1865
1866         rtnl_lock();
1867
1868         ret = register_netdevice(slave_dev);
1869         if (ret) {
1870                 netdev_err(master, "error %d registering interface %s\n",
1871                            ret, slave_dev->name);
1872                 rtnl_unlock();
1873                 goto out_phy;
1874         }
1875
1876         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1877
1878         rtnl_unlock();
1879
1880         if (ret)
1881                 goto out_unregister;
1882
1883         return 0;
1884
1885 out_unregister:
1886         unregister_netdev(slave_dev);
1887 out_phy:
1888         rtnl_lock();
1889         phylink_disconnect_phy(p->dp->pl);
1890         rtnl_unlock();
1891         phylink_destroy(p->dp->pl);
1892 out_gcells:
1893         gro_cells_destroy(&p->gcells);
1894 out_free:
1895         free_percpu(slave_dev->tstats);
1896         free_netdev(slave_dev);
1897         port->slave = NULL;
1898         return ret;
1899 }
1900
1901 void dsa_slave_destroy(struct net_device *slave_dev)
1902 {
1903         struct net_device *master = dsa_slave_to_master(slave_dev);
1904         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1905         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1906
1907         netif_carrier_off(slave_dev);
1908         rtnl_lock();
1909         netdev_upper_dev_unlink(master, slave_dev);
1910         unregister_netdevice(slave_dev);
1911         phylink_disconnect_phy(dp->pl);
1912         rtnl_unlock();
1913
1914         phylink_destroy(dp->pl);
1915         gro_cells_destroy(&p->gcells);
1916         free_percpu(slave_dev->tstats);
1917         free_netdev(slave_dev);
1918 }
1919
1920 bool dsa_slave_dev_check(const struct net_device *dev)
1921 {
1922         return dev->netdev_ops == &dsa_slave_netdev_ops;
1923 }
1924 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
1925
1926 static int dsa_slave_changeupper(struct net_device *dev,
1927                                  struct netdev_notifier_changeupper_info *info)
1928 {
1929         struct dsa_port *dp = dsa_slave_to_port(dev);
1930         int err = NOTIFY_DONE;
1931
1932         if (netif_is_bridge_master(info->upper_dev)) {
1933                 if (info->linking) {
1934                         err = dsa_port_bridge_join(dp, info->upper_dev);
1935                         if (!err)
1936                                 dsa_bridge_mtu_normalization(dp);
1937                         err = notifier_from_errno(err);
1938                 } else {
1939                         dsa_port_bridge_leave(dp, info->upper_dev);
1940                         err = NOTIFY_OK;
1941                 }
1942         } else if (netif_is_lag_master(info->upper_dev)) {
1943                 if (info->linking) {
1944                         err = dsa_port_lag_join(dp, info->upper_dev,
1945                                                 info->upper_info);
1946                         if (err == -EOPNOTSUPP) {
1947                                 NL_SET_ERR_MSG_MOD(info->info.extack,
1948                                                    "Offloading not supported");
1949                                 err = 0;
1950                         }
1951                         err = notifier_from_errno(err);
1952                 } else {
1953                         dsa_port_lag_leave(dp, info->upper_dev);
1954                         err = NOTIFY_OK;
1955                 }
1956         } else if (is_hsr_master(info->upper_dev)) {
1957                 if (info->linking) {
1958                         err = dsa_port_hsr_join(dp, info->upper_dev);
1959                         if (err == -EOPNOTSUPP) {
1960                                 NL_SET_ERR_MSG_MOD(info->info.extack,
1961                                                    "Offloading not supported");
1962                                 err = 0;
1963                         }
1964                         err = notifier_from_errno(err);
1965                 } else {
1966                         dsa_port_hsr_leave(dp, info->upper_dev);
1967                         err = NOTIFY_OK;
1968                 }
1969         }
1970
1971         return err;
1972 }
1973
1974 static int
1975 dsa_slave_lag_changeupper(struct net_device *dev,
1976                           struct netdev_notifier_changeupper_info *info)
1977 {
1978         struct net_device *lower;
1979         struct list_head *iter;
1980         int err = NOTIFY_DONE;
1981         struct dsa_port *dp;
1982
1983         netdev_for_each_lower_dev(dev, lower, iter) {
1984                 if (!dsa_slave_dev_check(lower))
1985                         continue;
1986
1987                 dp = dsa_slave_to_port(lower);
1988                 if (!dp->lag_dev)
1989                         /* Software LAG */
1990                         continue;
1991
1992                 err = dsa_slave_changeupper(lower, info);
1993                 if (notifier_to_errno(err))
1994                         break;
1995         }
1996
1997         return err;
1998 }
1999
2000 static int
2001 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2002                                  struct netdev_notifier_changeupper_info *info)
2003 {
2004         struct netlink_ext_ack *ext_ack;
2005         struct net_device *slave;
2006         struct dsa_port *dp;
2007
2008         ext_ack = netdev_notifier_info_to_extack(&info->info);
2009
2010         if (!is_vlan_dev(dev))
2011                 return NOTIFY_DONE;
2012
2013         slave = vlan_dev_real_dev(dev);
2014         if (!dsa_slave_dev_check(slave))
2015                 return NOTIFY_DONE;
2016
2017         dp = dsa_slave_to_port(slave);
2018         if (!dp->bridge_dev)
2019                 return NOTIFY_DONE;
2020
2021         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2022         if (br_vlan_enabled(dp->bridge_dev) &&
2023             netif_is_bridge_master(info->upper_dev) && info->linking) {
2024                 NL_SET_ERR_MSG_MOD(ext_ack,
2025                                    "Cannot enslave VLAN device into VLAN aware bridge");
2026                 return notifier_from_errno(-EINVAL);
2027         }
2028
2029         return NOTIFY_DONE;
2030 }
2031
2032 static int
2033 dsa_slave_check_8021q_upper(struct net_device *dev,
2034                             struct netdev_notifier_changeupper_info *info)
2035 {
2036         struct dsa_port *dp = dsa_slave_to_port(dev);
2037         struct net_device *br = dp->bridge_dev;
2038         struct bridge_vlan_info br_info;
2039         struct netlink_ext_ack *extack;
2040         int err = NOTIFY_DONE;
2041         u16 vid;
2042
2043         if (!br || !br_vlan_enabled(br))
2044                 return NOTIFY_DONE;
2045
2046         extack = netdev_notifier_info_to_extack(&info->info);
2047         vid = vlan_dev_vlan_id(info->upper_dev);
2048
2049         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2050          * device, respectively the VID is not found, returning
2051          * 0 means success, which is a failure for us here.
2052          */
2053         err = br_vlan_get_info(br, vid, &br_info);
2054         if (err == 0) {
2055                 NL_SET_ERR_MSG_MOD(extack,
2056                                    "This VLAN is already configured by the bridge");
2057                 return notifier_from_errno(-EBUSY);
2058         }
2059
2060         return NOTIFY_DONE;
2061 }
2062
2063 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2064                                      unsigned long event, void *ptr)
2065 {
2066         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2067
2068         switch (event) {
2069         case NETDEV_PRECHANGEUPPER: {
2070                 struct netdev_notifier_changeupper_info *info = ptr;
2071                 struct dsa_switch *ds;
2072                 struct dsa_port *dp;
2073                 int err;
2074
2075                 if (!dsa_slave_dev_check(dev))
2076                         return dsa_prevent_bridging_8021q_upper(dev, ptr);
2077
2078                 dp = dsa_slave_to_port(dev);
2079                 ds = dp->ds;
2080
2081                 if (ds->ops->port_prechangeupper) {
2082                         err = ds->ops->port_prechangeupper(ds, dp->index, info);
2083                         if (err)
2084                                 return notifier_from_errno(err);
2085                 }
2086
2087                 if (is_vlan_dev(info->upper_dev))
2088                         return dsa_slave_check_8021q_upper(dev, ptr);
2089                 break;
2090         }
2091         case NETDEV_CHANGEUPPER:
2092                 if (dsa_slave_dev_check(dev))
2093                         return dsa_slave_changeupper(dev, ptr);
2094
2095                 if (netif_is_lag_master(dev))
2096                         return dsa_slave_lag_changeupper(dev, ptr);
2097
2098                 break;
2099         case NETDEV_CHANGELOWERSTATE: {
2100                 struct netdev_notifier_changelowerstate_info *info = ptr;
2101                 struct dsa_port *dp;
2102                 int err;
2103
2104                 if (!dsa_slave_dev_check(dev))
2105                         break;
2106
2107                 dp = dsa_slave_to_port(dev);
2108
2109                 err = dsa_port_lag_change(dp, info->lower_state_info);
2110                 return notifier_from_errno(err);
2111         }
2112         case NETDEV_GOING_DOWN: {
2113                 struct dsa_port *dp, *cpu_dp;
2114                 struct dsa_switch_tree *dst;
2115                 LIST_HEAD(close_list);
2116
2117                 if (!netdev_uses_dsa(dev))
2118                         return NOTIFY_DONE;
2119
2120                 cpu_dp = dev->dsa_ptr;
2121                 dst = cpu_dp->ds->dst;
2122
2123                 list_for_each_entry(dp, &dst->ports, list) {
2124                         if (!dsa_is_user_port(dp->ds, dp->index))
2125                                 continue;
2126
2127                         list_add(&dp->slave->close_list, &close_list);
2128                 }
2129
2130                 dev_close_many(&close_list, true);
2131
2132                 return NOTIFY_OK;
2133         }
2134         default:
2135                 break;
2136         }
2137
2138         return NOTIFY_DONE;
2139 }
2140
2141 static void
2142 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2143 {
2144         struct dsa_switch *ds = switchdev_work->ds;
2145         struct switchdev_notifier_fdb_info info;
2146         struct dsa_port *dp;
2147
2148         if (!dsa_is_user_port(ds, switchdev_work->port))
2149                 return;
2150
2151         info.addr = switchdev_work->addr;
2152         info.vid = switchdev_work->vid;
2153         info.offloaded = true;
2154         dp = dsa_to_port(ds, switchdev_work->port);
2155         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2156                                  dp->slave, &info.info, NULL);
2157 }
2158
2159 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2160 {
2161         struct dsa_switchdev_event_work *switchdev_work =
2162                 container_of(work, struct dsa_switchdev_event_work, work);
2163         struct dsa_switch *ds = switchdev_work->ds;
2164         struct dsa_port *dp;
2165         int err;
2166
2167         dp = dsa_to_port(ds, switchdev_work->port);
2168
2169         rtnl_lock();
2170         switch (switchdev_work->event) {
2171         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2172                 err = dsa_port_fdb_add(dp, switchdev_work->addr,
2173                                        switchdev_work->vid);
2174                 if (err) {
2175                         dev_err(ds->dev,
2176                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2177                                 dp->index, switchdev_work->addr,
2178                                 switchdev_work->vid, err);
2179                         break;
2180                 }
2181                 dsa_fdb_offload_notify(switchdev_work);
2182                 break;
2183
2184         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2185                 err = dsa_port_fdb_del(dp, switchdev_work->addr,
2186                                        switchdev_work->vid);
2187                 if (err) {
2188                         dev_err(ds->dev,
2189                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2190                                 dp->index, switchdev_work->addr,
2191                                 switchdev_work->vid, err);
2192                 }
2193
2194                 break;
2195         }
2196         rtnl_unlock();
2197
2198         kfree(switchdev_work);
2199         if (dsa_is_user_port(ds, dp->index))
2200                 dev_put(dp->slave);
2201 }
2202
2203 static int dsa_lower_dev_walk(struct net_device *lower_dev,
2204                               struct netdev_nested_priv *priv)
2205 {
2206         if (dsa_slave_dev_check(lower_dev)) {
2207                 priv->data = (void *)netdev_priv(lower_dev);
2208                 return 1;
2209         }
2210
2211         return 0;
2212 }
2213
2214 static struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev)
2215 {
2216         struct netdev_nested_priv priv = {
2217                 .data = NULL,
2218         };
2219
2220         netdev_walk_all_lower_dev_rcu(dev, dsa_lower_dev_walk, &priv);
2221
2222         return (struct dsa_slave_priv *)priv.data;
2223 }
2224
2225 /* Called under rcu_read_lock() */
2226 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2227                                      unsigned long event, void *ptr)
2228 {
2229         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2230         const struct switchdev_notifier_fdb_info *fdb_info;
2231         struct dsa_switchdev_event_work *switchdev_work;
2232         struct dsa_port *dp;
2233         int err;
2234
2235         switch (event) {
2236         case SWITCHDEV_PORT_ATTR_SET:
2237                 err = switchdev_handle_port_attr_set(dev, ptr,
2238                                                      dsa_slave_dev_check,
2239                                                      dsa_slave_port_attr_set);
2240                 return notifier_from_errno(err);
2241         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2242         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2243                 fdb_info = ptr;
2244
2245                 if (dsa_slave_dev_check(dev)) {
2246                         if (!fdb_info->added_by_user)
2247                                 return NOTIFY_OK;
2248
2249                         dp = dsa_slave_to_port(dev);
2250                 } else {
2251                         /* Snoop addresses learnt on foreign interfaces
2252                          * bridged with us, for switches that don't
2253                          * automatically learn SA from CPU-injected traffic
2254                          */
2255                         struct net_device *br_dev;
2256                         struct dsa_slave_priv *p;
2257
2258                         br_dev = netdev_master_upper_dev_get_rcu(dev);
2259                         if (!br_dev)
2260                                 return NOTIFY_DONE;
2261
2262                         if (!netif_is_bridge_master(br_dev))
2263                                 return NOTIFY_DONE;
2264
2265                         p = dsa_slave_dev_lower_find(br_dev);
2266                         if (!p)
2267                                 return NOTIFY_DONE;
2268
2269                         dp = p->dp->cpu_dp;
2270
2271                         if (!dp->ds->assisted_learning_on_cpu_port)
2272                                 return NOTIFY_DONE;
2273
2274                         /* When the bridge learns an address on an offloaded
2275                          * LAG we don't want to send traffic to the CPU, the
2276                          * other ports bridged with the LAG should be able to
2277                          * autonomously forward towards it.
2278                          */
2279                         if (dsa_tree_offloads_netdev(dp->ds->dst, dev))
2280                                 return NOTIFY_DONE;
2281                 }
2282
2283                 if (!dp->ds->ops->port_fdb_add || !dp->ds->ops->port_fdb_del)
2284                         return NOTIFY_DONE;
2285
2286                 switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2287                 if (!switchdev_work)
2288                         return NOTIFY_BAD;
2289
2290                 INIT_WORK(&switchdev_work->work,
2291                           dsa_slave_switchdev_event_work);
2292                 switchdev_work->ds = dp->ds;
2293                 switchdev_work->port = dp->index;
2294                 switchdev_work->event = event;
2295
2296                 ether_addr_copy(switchdev_work->addr,
2297                                 fdb_info->addr);
2298                 switchdev_work->vid = fdb_info->vid;
2299
2300                 /* Hold a reference on the slave for dsa_fdb_offload_notify */
2301                 if (dsa_is_user_port(dp->ds, dp->index))
2302                         dev_hold(dev);
2303                 dsa_schedule_work(&switchdev_work->work);
2304                 break;
2305         default:
2306                 return NOTIFY_DONE;
2307         }
2308
2309         return NOTIFY_OK;
2310 }
2311
2312 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2313                                               unsigned long event, void *ptr)
2314 {
2315         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2316         int err;
2317
2318         switch (event) {
2319         case SWITCHDEV_PORT_OBJ_ADD:
2320                 err = switchdev_handle_port_obj_add(dev, ptr,
2321                                                     dsa_slave_dev_check,
2322                                                     dsa_slave_port_obj_add);
2323                 return notifier_from_errno(err);
2324         case SWITCHDEV_PORT_OBJ_DEL:
2325                 err = switchdev_handle_port_obj_del(dev, ptr,
2326                                                     dsa_slave_dev_check,
2327                                                     dsa_slave_port_obj_del);
2328                 return notifier_from_errno(err);
2329         case SWITCHDEV_PORT_ATTR_SET:
2330                 err = switchdev_handle_port_attr_set(dev, ptr,
2331                                                      dsa_slave_dev_check,
2332                                                      dsa_slave_port_attr_set);
2333                 return notifier_from_errno(err);
2334         }
2335
2336         return NOTIFY_DONE;
2337 }
2338
2339 static struct notifier_block dsa_slave_nb __read_mostly = {
2340         .notifier_call  = dsa_slave_netdevice_event,
2341 };
2342
2343 static struct notifier_block dsa_slave_switchdev_notifier = {
2344         .notifier_call = dsa_slave_switchdev_event,
2345 };
2346
2347 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2348         .notifier_call = dsa_slave_switchdev_blocking_event,
2349 };
2350
2351 int dsa_slave_register_notifier(void)
2352 {
2353         struct notifier_block *nb;
2354         int err;
2355
2356         err = register_netdevice_notifier(&dsa_slave_nb);
2357         if (err)
2358                 return err;
2359
2360         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2361         if (err)
2362                 goto err_switchdev_nb;
2363
2364         nb = &dsa_slave_switchdev_blocking_notifier;
2365         err = register_switchdev_blocking_notifier(nb);
2366         if (err)
2367                 goto err_switchdev_blocking_nb;
2368
2369         return 0;
2370
2371 err_switchdev_blocking_nb:
2372         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2373 err_switchdev_nb:
2374         unregister_netdevice_notifier(&dsa_slave_nb);
2375         return err;
2376 }
2377
2378 void dsa_slave_unregister_notifier(void)
2379 {
2380         struct notifier_block *nb;
2381         int err;
2382
2383         nb = &dsa_slave_switchdev_blocking_notifier;
2384         err = unregister_switchdev_blocking_notifier(nb);
2385         if (err)
2386                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2387
2388         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2389         if (err)
2390                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2391
2392         err = unregister_netdevice_notifier(&dsa_slave_nb);
2393         if (err)
2394                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2395 }