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                                    struct switchdev_trans *trans)
 273 {
 274         struct dsa_port *dp = dsa_slave_to_port(dev);
 275         int ret;
 276
 277         switch (attr->id) {
 278         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 279                 ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
 280                 break;
 281         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 282                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 283                                               trans);
 284                 break;
 285         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 286                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
 287                 break;
 288         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 289                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 290                                                 trans);
 291                 break;
 292         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 293                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans);
 294                 break;
 295         case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 296                 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, trans);
 297                 break;
 298         default:
 299                 ret = -EOPNOTSUPP;
 300                 break;
 301         }
 302
 303         return ret;
 304 }
 305
 306 /* Must be called under rcu_read_lock() */
 307 static int
 308 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 309                                       const struct switchdev_obj_port_vlan *vlan)
 310 {
 311         struct net_device *upper_dev;
 312         struct list_head *iter;
 313
 314         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 315                 u16 vid;
 316
 317                 if (!is_vlan_dev(upper_dev))
 318                         continue;
 319
 320                 vid = vlan_dev_vlan_id(upper_dev);
 321                 if (vid == vlan->vid)
 322                         return -EBUSY;
 323         }
 324
 325         return 0;
 326 }
 327
 328 static int dsa_slave_vlan_add(struct net_device *dev,
 329                               const struct switchdev_obj *obj,
 330                               struct switchdev_trans *trans)
 331 {
 332         struct net_device *master = dsa_slave_to_master(dev);
 333         struct dsa_port *dp = dsa_slave_to_port(dev);
 334         struct switchdev_obj_port_vlan vlan;
 335         int err;
 336
 337         if (obj->orig_dev != dev)
 338                 return -EOPNOTSUPP;
 339
 340         if (dsa_port_skip_vlan_configuration(dp))
 341                 return 0;
 342
 343         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 344
 345         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 346          * the same VID.
 347          */
 348         if (trans->ph_prepare && br_vlan_enabled(dp->bridge_dev)) {
 349                 rcu_read_lock();
 350                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
 351                 rcu_read_unlock();
 352                 if (err)
 353                         return err;
 354         }
 355
 356         err = dsa_port_vlan_add(dp, &vlan, trans);
 357         if (err)
 358                 return err;
 359
 360         /* We need the dedicated CPU port to be a member of the VLAN as well.
 361          * Even though drivers often handle CPU membership in special ways,
 362          * it doesn't make sense to program a PVID, so clear this flag.
 363          */
 364         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 365
 366         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, trans);
 367         if (err)
 368                 return err;
 369
 370         return vlan_vid_add(master, htons(ETH_P_8021Q), vlan.vid);
 371 }
 372
 373 static int dsa_slave_port_obj_add(struct net_device *dev,
 374                                   const struct switchdev_obj *obj,
 375                                   struct switchdev_trans *trans,
 376                                   struct netlink_ext_ack *extack)
 377 {
 378         struct dsa_port *dp = dsa_slave_to_port(dev);
 379         int err;
 380
 381         /* For the prepare phase, ensure the full set of changes is feasable in
 382          * one go in order to signal a failure properly. If an operation is not
 383          * supported, return -EOPNOTSUPP.
 384          */
 385
 386         switch (obj->id) {
 387         case SWITCHDEV_OBJ_ID_PORT_MDB:
 388                 if (obj->orig_dev != dev)
 389                         return -EOPNOTSUPP;
 390                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 391                 break;
 392         case SWITCHDEV_OBJ_ID_HOST_MDB:
 393                 /* DSA can directly translate this to a normal MDB add,
 394                  * but on the CPU port.
 395                  */
 396                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj),
 397                                        trans);
 398                 break;
 399         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 400                 err = dsa_slave_vlan_add(dev, obj, trans);
 401                 break;
 402         default:
 403                 err = -EOPNOTSUPP;
 404                 break;
 405         }
 406
 407         return err;
 408 }
 409
 410 static int dsa_slave_vlan_del(struct net_device *dev,
 411                               const struct switchdev_obj *obj)
 412 {
 413         struct net_device *master = dsa_slave_to_master(dev);
 414         struct dsa_port *dp = dsa_slave_to_port(dev);
 415         struct switchdev_obj_port_vlan *vlan;
 416         int err;
 417
 418         if (obj->orig_dev != dev)
 419                 return -EOPNOTSUPP;
 420
 421         if (dsa_port_skip_vlan_configuration(dp))
 422                 return 0;
 423
 424         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 425
 426         /* Do not deprogram the CPU port as it may be shared with other user
 427          * ports which can be members of this VLAN as well.
 428          */
 429         err = dsa_port_vlan_del(dp, vlan);
 430         if (err)
 431                 return err;
 432
 433         vlan_vid_del(master, htons(ETH_P_8021Q), vlan->vid);
 434
 435         return 0;
 436 }
 437
 438 static int dsa_slave_port_obj_del(struct net_device *dev,
 439                                   const struct switchdev_obj *obj)
 440 {
 441         struct dsa_port *dp = dsa_slave_to_port(dev);
 442         int err;
 443
 444         switch (obj->id) {
 445         case SWITCHDEV_OBJ_ID_PORT_MDB:
 446                 if (obj->orig_dev != dev)
 447                         return -EOPNOTSUPP;
 448                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 449                 break;
 450         case SWITCHDEV_OBJ_ID_HOST_MDB:
 451                 /* DSA can directly translate this to a normal MDB add,
 452                  * but on the CPU port.
 453                  */
 454                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 455                 break;
 456         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 457                 err = dsa_slave_vlan_del(dev, obj);
 458                 break;
 459         default:
 460                 err = -EOPNOTSUPP;
 461                 break;
 462         }
 463
 464         return err;
 465 }
 466
 467 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 468                                         struct netdev_phys_item_id *ppid)
 469 {
 470         struct dsa_port *dp = dsa_slave_to_port(dev);
 471         struct dsa_switch *ds = dp->ds;
 472         struct dsa_switch_tree *dst = ds->dst;
 473
 474         /* For non-legacy ports, devlink is used and it takes
 475          * care of the name generation. This ndo implementation
 476          * should be removed with legacy support.
 477          */
 478         if (dp->ds->devlink)
 479                 return -EOPNOTSUPP;
 480
 481         ppid->id_len = sizeof(dst->index);
 482         memcpy(&ppid->id, &dst->index, ppid->id_len);
 483
 484         return 0;
 485 }
 486
 487 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 488                                                      struct sk_buff *skb)
 489 {
 490 #ifdef CONFIG_NET_POLL_CONTROLLER
 491         struct dsa_slave_priv *p = netdev_priv(dev);
 492
 493         return netpoll_send_skb(p->netpoll, skb);
 494 #else
 495         BUG();
 496         return NETDEV_TX_OK;
 497 #endif
 498 }
 499
 500 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 501                                  struct sk_buff *skb)
 502 {
 503         struct dsa_switch *ds = p->dp->ds;
 504         struct sk_buff *clone;
 505         unsigned int type;
 506
 507         type = ptp_classify_raw(skb);
 508         if (type == PTP_CLASS_NONE)
 509                 return;
 510
 511         if (!ds->ops->port_txtstamp)
 512                 return;
 513
 514         clone = skb_clone_sk(skb);
 515         if (!clone)
 516                 return;
 517
 518         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type)) {
 519                 DSA_SKB_CB(skb)->clone = clone;
 520                 return;
 521         }
 522
 523         kfree_skb(clone);
 524 }
 525
 526 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 527 {
 528         /* SKB for netpoll still need to be mangled with the protocol-specific
 529          * tag to be successfully transmitted
 530          */
 531         if (unlikely(netpoll_tx_running(dev)))
 532                 return dsa_slave_netpoll_send_skb(dev, skb);
 533
 534         /* Queue the SKB for transmission on the parent interface, but
 535          * do not modify its EtherType
 536          */
 537         skb->dev = dsa_slave_to_master(dev);
 538         dev_queue_xmit(skb);
 539
 540         return NETDEV_TX_OK;
 541 }
 542 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 543
 544 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 545 {
 546         int needed_headroom = dev->needed_headroom;
 547         int needed_tailroom = dev->needed_tailroom;
 548
 549         /* For tail taggers, we need to pad short frames ourselves, to ensure
 550          * that the tail tag does not fail at its role of being at the end of
 551          * the packet, once the master interface pads the frame. Account for
 552          * that pad length here, and pad later.
 553          */
 554         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 555                 needed_tailroom += ETH_ZLEN - skb->len;
 556         /* skb_headroom() returns unsigned int... */
 557         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 558         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 559
 560         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 561                 /* No reallocation needed, yay! */
 562                 return 0;
 563
 564         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 565                                 GFP_ATOMIC);
 566 }
 567
 568 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 569 {
 570         struct dsa_slave_priv *p = netdev_priv(dev);
 571         struct sk_buff *nskb;
 572
 573         dev_sw_netstats_tx_add(dev, 1, skb->len);
 574
 575         DSA_SKB_CB(skb)->clone = NULL;
 576
 577         /* Identify PTP protocol packets, clone them, and pass them to the
 578          * switch driver
 579          */
 580         dsa_skb_tx_timestamp(p, skb);
 581
 582         if (dsa_realloc_skb(skb, dev)) {
 583                 dev_kfree_skb_any(skb);
 584                 return NETDEV_TX_OK;
 585         }
 586
 587         /* needed_tailroom should still be 'warm' in the cache line from
 588          * dsa_realloc_skb(), which has also ensured that padding is safe.
 589          */
 590         if (dev->needed_tailroom)
 591                 eth_skb_pad(skb);
 592
 593         /* Transmit function may have to reallocate the original SKB,
 594          * in which case it must have freed it. Only free it here on error.
 595          */
 596         nskb = p->xmit(skb, dev);
 597         if (!nskb) {
 598                 kfree_skb(skb);
 599                 return NETDEV_TX_OK;
 600         }
 601
 602         return dsa_enqueue_skb(nskb, dev);
 603 }
 604
 605 /* ethtool operations *******************************************************/
 606
 607 static void dsa_slave_get_drvinfo(struct net_device *dev,
 608                                   struct ethtool_drvinfo *drvinfo)
 609 {
 610         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 611         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 612         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 613 }
 614
 615 static int dsa_slave_get_regs_len(struct net_device *dev)
 616 {
 617         struct dsa_port *dp = dsa_slave_to_port(dev);
 618         struct dsa_switch *ds = dp->ds;
 619
 620         if (ds->ops->get_regs_len)
 621                 return ds->ops->get_regs_len(ds, dp->index);
 622
 623         return -EOPNOTSUPP;
 624 }
 625
 626 static void
 627 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 628 {
 629         struct dsa_port *dp = dsa_slave_to_port(dev);
 630         struct dsa_switch *ds = dp->ds;
 631
 632         if (ds->ops->get_regs)
 633                 ds->ops->get_regs(ds, dp->index, regs, _p);
 634 }
 635
 636 static int dsa_slave_nway_reset(struct net_device *dev)
 637 {
 638         struct dsa_port *dp = dsa_slave_to_port(dev);
 639
 640         return phylink_ethtool_nway_reset(dp->pl);
 641 }
 642
 643 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 644 {
 645         struct dsa_port *dp = dsa_slave_to_port(dev);
 646         struct dsa_switch *ds = dp->ds;
 647
 648         if (ds->cd && ds->cd->eeprom_len)
 649                 return ds->cd->eeprom_len;
 650
 651         if (ds->ops->get_eeprom_len)
 652                 return ds->ops->get_eeprom_len(ds);
 653
 654         return 0;
 655 }
 656
 657 static int dsa_slave_get_eeprom(struct net_device *dev,
 658                                 struct ethtool_eeprom *eeprom, u8 *data)
 659 {
 660         struct dsa_port *dp = dsa_slave_to_port(dev);
 661         struct dsa_switch *ds = dp->ds;
 662
 663         if (ds->ops->get_eeprom)
 664                 return ds->ops->get_eeprom(ds, eeprom, data);
 665
 666         return -EOPNOTSUPP;
 667 }
 668
 669 static int dsa_slave_set_eeprom(struct net_device *dev,
 670                                 struct ethtool_eeprom *eeprom, u8 *data)
 671 {
 672         struct dsa_port *dp = dsa_slave_to_port(dev);
 673         struct dsa_switch *ds = dp->ds;
 674
 675         if (ds->ops->set_eeprom)
 676                 return ds->ops->set_eeprom(ds, eeprom, data);
 677
 678         return -EOPNOTSUPP;
 679 }
 680
 681 static void dsa_slave_get_strings(struct net_device *dev,
 682                                   uint32_t stringset, uint8_t *data)
 683 {
 684         struct dsa_port *dp = dsa_slave_to_port(dev);
 685         struct dsa_switch *ds = dp->ds;
 686
 687         if (stringset == ETH_SS_STATS) {
 688                 int len = ETH_GSTRING_LEN;
 689
 690                 strncpy(data, "tx_packets", len);
 691                 strncpy(data + len, "tx_bytes", len);
 692                 strncpy(data + 2 * len, "rx_packets", len);
 693                 strncpy(data + 3 * len, "rx_bytes", len);
 694                 if (ds->ops->get_strings)
 695                         ds->ops->get_strings(ds, dp->index, stringset,
 696                                              data + 4 * len);
 697         }
 698 }
 699
 700 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 701                                         struct ethtool_stats *stats,
 702                                         uint64_t *data)
 703 {
 704         struct dsa_port *dp = dsa_slave_to_port(dev);
 705         struct dsa_switch *ds = dp->ds;
 706         struct pcpu_sw_netstats *s;
 707         unsigned int start;
 708         int i;
 709
 710         for_each_possible_cpu(i) {
 711                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 712
 713                 s = per_cpu_ptr(dev->tstats, i);
 714                 do {
 715                         start = u64_stats_fetch_begin_irq(&s->syncp);
 716                         tx_packets = s->tx_packets;
 717                         tx_bytes = s->tx_bytes;
 718                         rx_packets = s->rx_packets;
 719                         rx_bytes = s->rx_bytes;
 720                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 721                 data[0] += tx_packets;
 722                 data[1] += tx_bytes;
 723                 data[2] += rx_packets;
 724                 data[3] += rx_bytes;
 725         }
 726         if (ds->ops->get_ethtool_stats)
 727                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 728 }
 729
 730 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 731 {
 732         struct dsa_port *dp = dsa_slave_to_port(dev);
 733         struct dsa_switch *ds = dp->ds;
 734
 735         if (sset == ETH_SS_STATS) {
 736                 int count;
 737
 738                 count = 4;
 739                 if (ds->ops->get_sset_count)
 740                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 741
 742                 return count;
 743         }
 744
 745         return -EOPNOTSUPP;
 746 }
 747
 748 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 749 {
 750         struct dsa_port *dp = dsa_slave_to_port(dev);
 751         struct dsa_switch *ds = dp->ds;
 752
 753         phylink_ethtool_get_wol(dp->pl, w);
 754
 755         if (ds->ops->get_wol)
 756                 ds->ops->get_wol(ds, dp->index, w);
 757 }
 758
 759 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 760 {
 761         struct dsa_port *dp = dsa_slave_to_port(dev);
 762         struct dsa_switch *ds = dp->ds;
 763         int ret = -EOPNOTSUPP;
 764
 765         phylink_ethtool_set_wol(dp->pl, w);
 766
 767         if (ds->ops->set_wol)
 768                 ret = ds->ops->set_wol(ds, dp->index, w);
 769
 770         return ret;
 771 }
 772
 773 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 774 {
 775         struct dsa_port *dp = dsa_slave_to_port(dev);
 776         struct dsa_switch *ds = dp->ds;
 777         int ret;
 778
 779         /* Port's PHY and MAC both need to be EEE capable */
 780         if (!dev->phydev || !dp->pl)
 781                 return -ENODEV;
 782
 783         if (!ds->ops->set_mac_eee)
 784                 return -EOPNOTSUPP;
 785
 786         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 787         if (ret)
 788                 return ret;
 789
 790         return phylink_ethtool_set_eee(dp->pl, e);
 791 }
 792
 793 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 794 {
 795         struct dsa_port *dp = dsa_slave_to_port(dev);
 796         struct dsa_switch *ds = dp->ds;
 797         int ret;
 798
 799         /* Port's PHY and MAC both need to be EEE capable */
 800         if (!dev->phydev || !dp->pl)
 801                 return -ENODEV;
 802
 803         if (!ds->ops->get_mac_eee)
 804                 return -EOPNOTSUPP;
 805
 806         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 807         if (ret)
 808                 return ret;
 809
 810         return phylink_ethtool_get_eee(dp->pl, e);
 811 }
 812
 813 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 814                                         struct ethtool_link_ksettings *cmd)
 815 {
 816         struct dsa_port *dp = dsa_slave_to_port(dev);
 817
 818         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 819 }
 820
 821 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 822                                         const struct ethtool_link_ksettings *cmd)
 823 {
 824         struct dsa_port *dp = dsa_slave_to_port(dev);
 825
 826         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 827 }
 828
 829 static void dsa_slave_get_pauseparam(struct net_device *dev,
 830                                      struct ethtool_pauseparam *pause)
 831 {
 832         struct dsa_port *dp = dsa_slave_to_port(dev);
 833
 834         phylink_ethtool_get_pauseparam(dp->pl, pause);
 835 }
 836
 837 static int dsa_slave_set_pauseparam(struct net_device *dev,
 838                                     struct ethtool_pauseparam *pause)
 839 {
 840         struct dsa_port *dp = dsa_slave_to_port(dev);
 841
 842         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 843 }
 844
 845 #ifdef CONFIG_NET_POLL_CONTROLLER
 846 static int dsa_slave_netpoll_setup(struct net_device *dev,
 847                                    struct netpoll_info *ni)
 848 {
 849         struct net_device *master = dsa_slave_to_master(dev);
 850         struct dsa_slave_priv *p = netdev_priv(dev);
 851         struct netpoll *netpoll;
 852         int err = 0;
 853
 854         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 855         if (!netpoll)
 856                 return -ENOMEM;
 857
 858         err = __netpoll_setup(netpoll, master);
 859         if (err) {
 860                 kfree(netpoll);
 861                 goto out;
 862         }
 863
 864         p->netpoll = netpoll;
 865 out:
 866         return err;
 867 }
 868
 869 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 870 {
 871         struct dsa_slave_priv *p = netdev_priv(dev);
 872         struct netpoll *netpoll = p->netpoll;
 873
 874         if (!netpoll)
 875                 return;
 876
 877         p->netpoll = NULL;
 878
 879         __netpoll_free(netpoll);
 880 }
 881
 882 static void dsa_slave_poll_controller(struct net_device *dev)
 883 {
 884 }
 885 #endif
 886
 887 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 888                                         char *name, size_t len)
 889 {
 890         struct dsa_port *dp = dsa_slave_to_port(dev);
 891
 892         /* For non-legacy ports, devlink is used and it takes
 893          * care of the name generation. This ndo implementation
 894          * should be removed with legacy support.
 895          */
 896         if (dp->ds->devlink)
 897                 return -EOPNOTSUPP;
 898
 899         if (snprintf(name, len, "p%d", dp->index) >= len)
 900                 return -EINVAL;
 901
 902         return 0;
 903 }
 904
 905 static struct dsa_mall_tc_entry *
 906 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 907 {
 908         struct dsa_slave_priv *p = netdev_priv(dev);
 909         struct dsa_mall_tc_entry *mall_tc_entry;
 910
 911         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 912                 if (mall_tc_entry->cookie == cookie)
 913                         return mall_tc_entry;
 914
 915         return NULL;
 916 }
 917
 918 static int
 919 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 920                                   struct tc_cls_matchall_offload *cls,
 921                                   bool ingress)
 922 {
 923         struct dsa_port *dp = dsa_slave_to_port(dev);
 924         struct dsa_slave_priv *p = netdev_priv(dev);
 925         struct dsa_mall_mirror_tc_entry *mirror;
 926         struct dsa_mall_tc_entry *mall_tc_entry;
 927         struct dsa_switch *ds = dp->ds;
 928         struct flow_action_entry *act;
 929         struct dsa_port *to_dp;
 930         int err;
 931
 932         if (!ds->ops->port_mirror_add)
 933                 return -EOPNOTSUPP;
 934
 935         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 936                                               cls->common.extack))
 937                 return -EOPNOTSUPP;
 938
 939         act = &cls->rule->action.entries[0];
 940
 941         if (!act->dev)
 942                 return -EINVAL;
 943
 944         if (!dsa_slave_dev_check(act->dev))
 945                 return -EOPNOTSUPP;
 946
 947         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 948         if (!mall_tc_entry)
 949                 return -ENOMEM;
 950
 951         mall_tc_entry->cookie = cls->cookie;
 952         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 953         mirror = &mall_tc_entry->mirror;
 954
 955         to_dp = dsa_slave_to_port(act->dev);
 956
 957         mirror->to_local_port = to_dp->index;
 958         mirror->ingress = ingress;
 959
 960         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 961         if (err) {
 962                 kfree(mall_tc_entry);
 963                 return err;
 964         }
 965
 966         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 967
 968         return err;
 969 }
 970
 971 static int
 972 dsa_slave_add_cls_matchall_police(struct net_device *dev,
 973                                   struct tc_cls_matchall_offload *cls,
 974                                   bool ingress)
 975 {
 976         struct netlink_ext_ack *extack = cls->common.extack;
 977         struct dsa_port *dp = dsa_slave_to_port(dev);
 978         struct dsa_slave_priv *p = netdev_priv(dev);
 979         struct dsa_mall_policer_tc_entry *policer;
 980         struct dsa_mall_tc_entry *mall_tc_entry;
 981         struct dsa_switch *ds = dp->ds;
 982         struct flow_action_entry *act;
 983         int err;
 984
 985         if (!ds->ops->port_policer_add) {
 986                 NL_SET_ERR_MSG_MOD(extack,
 987                                    "Policing offload not implemented");
 988                 return -EOPNOTSUPP;
 989         }
 990
 991         if (!ingress) {
 992                 NL_SET_ERR_MSG_MOD(extack,
 993                                    "Only supported on ingress qdisc");
 994                 return -EOPNOTSUPP;
 995         }
 996
 997         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 998                                               cls->common.extack))
 999                 return -EOPNOTSUPP;
1000
1001         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1002                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1003                         NL_SET_ERR_MSG_MOD(extack,
1004                                            "Only one port policer allowed");
1005                         return -EEXIST;
1006                 }
1007         }
1008
1009         act = &cls->rule->action.entries[0];
1010
1011         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1012         if (!mall_tc_entry)
1013                 return -ENOMEM;
1014
1015         mall_tc_entry->cookie = cls->cookie;
1016         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1017         policer = &mall_tc_entry->policer;
1018         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1019         policer->burst = act->police.burst;
1020
1021         err = ds->ops->port_policer_add(ds, dp->index, policer);
1022         if (err) {
1023                 kfree(mall_tc_entry);
1024                 return err;
1025         }
1026
1027         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1028
1029         return err;
1030 }
1031
1032 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1033                                       struct tc_cls_matchall_offload *cls,
1034                                       bool ingress)
1035 {
1036         int err = -EOPNOTSUPP;
1037
1038         if (cls->common.protocol == htons(ETH_P_ALL) &&
1039             flow_offload_has_one_action(&cls->rule->action) &&
1040             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1041                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1042         else if (flow_offload_has_one_action(&cls->rule->action) &&
1043                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1044                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1045
1046         return err;
1047 }
1048
1049 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1050                                        struct tc_cls_matchall_offload *cls)
1051 {
1052         struct dsa_port *dp = dsa_slave_to_port(dev);
1053         struct dsa_mall_tc_entry *mall_tc_entry;
1054         struct dsa_switch *ds = dp->ds;
1055
1056         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1057         if (!mall_tc_entry)
1058                 return;
1059
1060         list_del(&mall_tc_entry->list);
1061
1062         switch (mall_tc_entry->type) {
1063         case DSA_PORT_MALL_MIRROR:
1064                 if (ds->ops->port_mirror_del)
1065                         ds->ops->port_mirror_del(ds, dp->index,
1066                                                  &mall_tc_entry->mirror);
1067                 break;
1068         case DSA_PORT_MALL_POLICER:
1069                 if (ds->ops->port_policer_del)
1070                         ds->ops->port_policer_del(ds, dp->index);
1071                 break;
1072         default:
1073                 WARN_ON(1);
1074         }
1075
1076         kfree(mall_tc_entry);
1077 }
1078
1079 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1080                                            struct tc_cls_matchall_offload *cls,
1081                                            bool ingress)
1082 {
1083         if (cls->common.chain_index)
1084                 return -EOPNOTSUPP;
1085
1086         switch (cls->command) {
1087         case TC_CLSMATCHALL_REPLACE:
1088                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1089         case TC_CLSMATCHALL_DESTROY:
1090                 dsa_slave_del_cls_matchall(dev, cls);
1091                 return 0;
1092         default:
1093                 return -EOPNOTSUPP;
1094         }
1095 }
1096
1097 static int dsa_slave_add_cls_flower(struct net_device *dev,
1098                                     struct flow_cls_offload *cls,
1099                                     bool ingress)
1100 {
1101         struct dsa_port *dp = dsa_slave_to_port(dev);
1102         struct dsa_switch *ds = dp->ds;
1103         int port = dp->index;
1104
1105         if (!ds->ops->cls_flower_add)
1106                 return -EOPNOTSUPP;
1107
1108         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1109 }
1110
1111 static int dsa_slave_del_cls_flower(struct net_device *dev,
1112                                     struct flow_cls_offload *cls,
1113                                     bool ingress)
1114 {
1115         struct dsa_port *dp = dsa_slave_to_port(dev);
1116         struct dsa_switch *ds = dp->ds;
1117         int port = dp->index;
1118
1119         if (!ds->ops->cls_flower_del)
1120                 return -EOPNOTSUPP;
1121
1122         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1123 }
1124
1125 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1126                                       struct flow_cls_offload *cls,
1127                                       bool ingress)
1128 {
1129         struct dsa_port *dp = dsa_slave_to_port(dev);
1130         struct dsa_switch *ds = dp->ds;
1131         int port = dp->index;
1132
1133         if (!ds->ops->cls_flower_stats)
1134                 return -EOPNOTSUPP;
1135
1136         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1137 }
1138
1139 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1140                                          struct flow_cls_offload *cls,
1141                                          bool ingress)
1142 {
1143         switch (cls->command) {
1144         case FLOW_CLS_REPLACE:
1145                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1146         case FLOW_CLS_DESTROY:
1147                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1148         case FLOW_CLS_STATS:
1149                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1150         default:
1151                 return -EOPNOTSUPP;
1152         }
1153 }
1154
1155 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1156                                        void *cb_priv, bool ingress)
1157 {
1158         struct net_device *dev = cb_priv;
1159
1160         if (!tc_can_offload(dev))
1161                 return -EOPNOTSUPP;
1162
1163         switch (type) {
1164         case TC_SETUP_CLSMATCHALL:
1165                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1166         case TC_SETUP_CLSFLOWER:
1167                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1168         default:
1169                 return -EOPNOTSUPP;
1170         }
1171 }
1172
1173 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1174                                           void *type_data, void *cb_priv)
1175 {
1176         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1177 }
1178
1179 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1180                                           void *type_data, void *cb_priv)
1181 {
1182         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1183 }
1184
1185 static LIST_HEAD(dsa_slave_block_cb_list);
1186
1187 static int dsa_slave_setup_tc_block(struct net_device *dev,
1188                                     struct flow_block_offload *f)
1189 {
1190         struct flow_block_cb *block_cb;
1191         flow_setup_cb_t *cb;
1192
1193         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1194                 cb = dsa_slave_setup_tc_block_cb_ig;
1195         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1196                 cb = dsa_slave_setup_tc_block_cb_eg;
1197         else
1198                 return -EOPNOTSUPP;
1199
1200         f->driver_block_list = &dsa_slave_block_cb_list;
1201
1202         switch (f->command) {
1203         case FLOW_BLOCK_BIND:
1204                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1205                         return -EBUSY;
1206
1207                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1208                 if (IS_ERR(block_cb))
1209                         return PTR_ERR(block_cb);
1210
1211                 flow_block_cb_add(block_cb, f);
1212                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1213                 return 0;
1214         case FLOW_BLOCK_UNBIND:
1215                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1216                 if (!block_cb)
1217                         return -ENOENT;
1218
1219                 flow_block_cb_remove(block_cb, f);
1220                 list_del(&block_cb->driver_list);
1221                 return 0;
1222         default:
1223                 return -EOPNOTSUPP;
1224         }
1225 }
1226
1227 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1228                               void *type_data)
1229 {
1230         struct dsa_port *dp = dsa_slave_to_port(dev);
1231         struct dsa_switch *ds = dp->ds;
1232
1233         if (type == TC_SETUP_BLOCK)
1234                 return dsa_slave_setup_tc_block(dev, type_data);
1235
1236         if (!ds->ops->port_setup_tc)
1237                 return -EOPNOTSUPP;
1238
1239         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1240 }
1241
1242 static int dsa_slave_get_rxnfc(struct net_device *dev,
1243                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1244 {
1245         struct dsa_port *dp = dsa_slave_to_port(dev);
1246         struct dsa_switch *ds = dp->ds;
1247
1248         if (!ds->ops->get_rxnfc)
1249                 return -EOPNOTSUPP;
1250
1251         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1252 }
1253
1254 static int dsa_slave_set_rxnfc(struct net_device *dev,
1255                                struct ethtool_rxnfc *nfc)
1256 {
1257         struct dsa_port *dp = dsa_slave_to_port(dev);
1258         struct dsa_switch *ds = dp->ds;
1259
1260         if (!ds->ops->set_rxnfc)
1261                 return -EOPNOTSUPP;
1262
1263         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1264 }
1265
1266 static int dsa_slave_get_ts_info(struct net_device *dev,
1267                                  struct ethtool_ts_info *ts)
1268 {
1269         struct dsa_slave_priv *p = netdev_priv(dev);
1270         struct dsa_switch *ds = p->dp->ds;
1271
1272         if (!ds->ops->get_ts_info)
1273                 return -EOPNOTSUPP;
1274
1275         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1276 }
1277
1278 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1279                                      u16 vid)
1280 {
1281         struct net_device *master = dsa_slave_to_master(dev);
1282         struct dsa_port *dp = dsa_slave_to_port(dev);
1283         struct switchdev_obj_port_vlan vlan = {
1284                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1285                 .vid = vid,
1286                 /* This API only allows programming tagged, non-PVID VIDs */
1287                 .flags = 0,
1288         };
1289         struct switchdev_trans trans;
1290         int ret;
1291
1292         /* User port... */
1293         trans.ph_prepare = true;
1294         ret = dsa_port_vlan_add(dp, &vlan, &trans);
1295         if (ret)
1296                 return ret;
1297
1298         trans.ph_prepare = false;
1299         ret = dsa_port_vlan_add(dp, &vlan, &trans);
1300         if (ret)
1301                 return ret;
1302
1303         /* And CPU port... */
1304         trans.ph_prepare = true;
1305         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &trans);
1306         if (ret)
1307                 return ret;
1308
1309         trans.ph_prepare = false;
1310         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &trans);
1311         if (ret)
1312                 return ret;
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 static 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 const struct net_device_ops dsa_slave_netdev_ops = {
1597         .ndo_open               = dsa_slave_open,
1598         .ndo_stop               = dsa_slave_close,
1599         .ndo_start_xmit         = dsa_slave_xmit,
1600         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1601         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1602         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1603         .ndo_fdb_add            = dsa_legacy_fdb_add,
1604         .ndo_fdb_del            = dsa_legacy_fdb_del,
1605         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1606         .ndo_do_ioctl           = dsa_slave_ioctl,
1607         .ndo_get_iflink         = dsa_slave_get_iflink,
1608 #ifdef CONFIG_NET_POLL_CONTROLLER
1609         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1610         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1611         .ndo_poll_controller    = dsa_slave_poll_controller,
1612 #endif
1613         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1614         .ndo_setup_tc           = dsa_slave_setup_tc,
1615         .ndo_get_stats64        = dev_get_tstats64,
1616         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1617         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1618         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1619         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1620         .ndo_change_mtu         = dsa_slave_change_mtu,
1621 };
1622
1623 static struct device_type dsa_type = {
1624         .name   = "dsa",
1625 };
1626
1627 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1628 {
1629         const struct dsa_port *dp = dsa_to_port(ds, port);
1630
1631         if (dp->pl)
1632                 phylink_mac_change(dp->pl, up);
1633 }
1634 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1635
1636 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1637                                           struct phylink_link_state *state)
1638 {
1639         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1640         struct dsa_switch *ds = dp->ds;
1641
1642         /* No need to check that this operation is valid, the callback would
1643          * not be called if it was not.
1644          */
1645         ds->ops->phylink_fixed_state(ds, dp->index, state);
1646 }
1647
1648 /* slave device setup *******************************************************/
1649 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1650 {
1651         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1652         struct dsa_switch *ds = dp->ds;
1653
1654         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1655         if (!slave_dev->phydev) {
1656                 netdev_err(slave_dev, "no phy at %d\n", addr);
1657                 return -ENODEV;
1658         }
1659
1660         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1661 }
1662
1663 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1664 {
1665         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1666         struct device_node *port_dn = dp->dn;
1667         struct dsa_switch *ds = dp->ds;
1668         phy_interface_t mode;
1669         u32 phy_flags = 0;
1670         int ret;
1671
1672         ret = of_get_phy_mode(port_dn, &mode);
1673         if (ret)
1674                 mode = PHY_INTERFACE_MODE_NA;
1675
1676         dp->pl_config.dev = &slave_dev->dev;
1677         dp->pl_config.type = PHYLINK_NETDEV;
1678
1679         /* The get_fixed_state callback takes precedence over polling the
1680          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1681          * this if the switch provides such a callback.
1682          */
1683         if (ds->ops->phylink_fixed_state) {
1684                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1685                 dp->pl_config.poll_fixed_state = true;
1686         }
1687
1688         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1689                                 &dsa_port_phylink_mac_ops);
1690         if (IS_ERR(dp->pl)) {
1691                 netdev_err(slave_dev,
1692                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1693                 return PTR_ERR(dp->pl);
1694         }
1695
1696         if (ds->ops->get_phy_flags)
1697                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1698
1699         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1700         if (ret == -ENODEV && ds->slave_mii_bus) {
1701                 /* We could not connect to a designated PHY or SFP, so try to
1702                  * use the switch internal MDIO bus instead
1703                  */
1704                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1705                 if (ret) {
1706                         netdev_err(slave_dev,
1707                                    "failed to connect to port %d: %d\n",
1708                                    dp->index, ret);
1709                         phylink_destroy(dp->pl);
1710                         return ret;
1711                 }
1712         }
1713
1714         return ret;
1715 }
1716
1717 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1718 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1719                                             struct netdev_queue *txq,
1720                                             void *_unused)
1721 {
1722         lockdep_set_class(&txq->_xmit_lock,
1723                           &dsa_slave_netdev_xmit_lock_key);
1724 }
1725
1726 int dsa_slave_suspend(struct net_device *slave_dev)
1727 {
1728         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1729
1730         if (!netif_running(slave_dev))
1731                 return 0;
1732
1733         netif_device_detach(slave_dev);
1734
1735         rtnl_lock();
1736         phylink_stop(dp->pl);
1737         rtnl_unlock();
1738
1739         return 0;
1740 }
1741
1742 int dsa_slave_resume(struct net_device *slave_dev)
1743 {
1744         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1745
1746         if (!netif_running(slave_dev))
1747                 return 0;
1748
1749         netif_device_attach(slave_dev);
1750
1751         rtnl_lock();
1752         phylink_start(dp->pl);
1753         rtnl_unlock();
1754
1755         return 0;
1756 }
1757
1758 int dsa_slave_create(struct dsa_port *port)
1759 {
1760         const struct dsa_port *cpu_dp = port->cpu_dp;
1761         struct net_device *master = cpu_dp->master;
1762         struct dsa_switch *ds = port->ds;
1763         const char *name = port->name;
1764         struct net_device *slave_dev;
1765         struct dsa_slave_priv *p;
1766         int ret;
1767
1768         if (!ds->num_tx_queues)
1769                 ds->num_tx_queues = 1;
1770
1771         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1772                                      NET_NAME_UNKNOWN, ether_setup,
1773                                      ds->num_tx_queues, 1);
1774         if (slave_dev == NULL)
1775                 return -ENOMEM;
1776
1777         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1778         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1779                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1780         slave_dev->hw_features |= NETIF_F_HW_TC;
1781         slave_dev->features |= NETIF_F_LLTX;
1782         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1783         if (!IS_ERR_OR_NULL(port->mac))
1784                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1785         else
1786                 eth_hw_addr_inherit(slave_dev, master);
1787         slave_dev->priv_flags |= IFF_NO_QUEUE;
1788         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1789         if (ds->ops->port_max_mtu)
1790                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1791         if (cpu_dp->tag_ops->tail_tag)
1792                 slave_dev->needed_tailroom = cpu_dp->tag_ops->overhead;
1793         else
1794                 slave_dev->needed_headroom = cpu_dp->tag_ops->overhead;
1795         /* Try to save one extra realloc later in the TX path (in the master)
1796          * by also inheriting the master's needed headroom and tailroom.
1797          * The 8021q driver also does this.
1798          */
1799         slave_dev->needed_headroom += master->needed_headroom;
1800         slave_dev->needed_tailroom += master->needed_tailroom;
1801         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1802
1803         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1804                                  NULL);
1805
1806         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1807         slave_dev->dev.of_node = port->dn;
1808         slave_dev->vlan_features = master->vlan_features;
1809
1810         p = netdev_priv(slave_dev);
1811         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1812         if (!slave_dev->tstats) {
1813                 free_netdev(slave_dev);
1814                 return -ENOMEM;
1815         }
1816
1817         ret = gro_cells_init(&p->gcells, slave_dev);
1818         if (ret)
1819                 goto out_free;
1820
1821         p->dp = port;
1822         INIT_LIST_HEAD(&p->mall_tc_list);
1823         p->xmit = cpu_dp->tag_ops->xmit;
1824         port->slave = slave_dev;
1825
1826         rtnl_lock();
1827         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1828         rtnl_unlock();
1829         if (ret && ret != -EOPNOTSUPP)
1830                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1831                          ret, ETH_DATA_LEN, port->index);
1832
1833         netif_carrier_off(slave_dev);
1834
1835         ret = dsa_slave_phy_setup(slave_dev);
1836         if (ret) {
1837                 netdev_err(slave_dev,
1838                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1839                            ret, ds->dst->index, ds->index, port->index);
1840                 goto out_gcells;
1841         }
1842
1843         rtnl_lock();
1844
1845         ret = register_netdevice(slave_dev);
1846         if (ret) {
1847                 netdev_err(master, "error %d registering interface %s\n",
1848                            ret, slave_dev->name);
1849                 rtnl_unlock();
1850                 goto out_phy;
1851         }
1852
1853         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1854
1855         rtnl_unlock();
1856
1857         if (ret)
1858                 goto out_unregister;
1859
1860         return 0;
1861
1862 out_unregister:
1863         unregister_netdev(slave_dev);
1864 out_phy:
1865         rtnl_lock();
1866         phylink_disconnect_phy(p->dp->pl);
1867         rtnl_unlock();
1868         phylink_destroy(p->dp->pl);
1869 out_gcells:
1870         gro_cells_destroy(&p->gcells);
1871 out_free:
1872         free_percpu(slave_dev->tstats);
1873         free_netdev(slave_dev);
1874         port->slave = NULL;
1875         return ret;
1876 }
1877
1878 void dsa_slave_destroy(struct net_device *slave_dev)
1879 {
1880         struct net_device *master = dsa_slave_to_master(slave_dev);
1881         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1882         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1883
1884         netif_carrier_off(slave_dev);
1885         rtnl_lock();
1886         netdev_upper_dev_unlink(master, slave_dev);
1887         unregister_netdevice(slave_dev);
1888         phylink_disconnect_phy(dp->pl);
1889         rtnl_unlock();
1890
1891         phylink_destroy(dp->pl);
1892         gro_cells_destroy(&p->gcells);
1893         free_percpu(slave_dev->tstats);
1894         free_netdev(slave_dev);
1895 }
1896
1897 bool dsa_slave_dev_check(const struct net_device *dev)
1898 {
1899         return dev->netdev_ops == &dsa_slave_netdev_ops;
1900 }
1901 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
1902
1903 static int dsa_slave_changeupper(struct net_device *dev,
1904                                  struct netdev_notifier_changeupper_info *info)
1905 {
1906         struct dsa_port *dp = dsa_slave_to_port(dev);
1907         int err = NOTIFY_DONE;
1908
1909         if (netif_is_bridge_master(info->upper_dev)) {
1910                 if (info->linking) {
1911                         err = dsa_port_bridge_join(dp, info->upper_dev);
1912                         if (!err)
1913                                 dsa_bridge_mtu_normalization(dp);
1914                         err = notifier_from_errno(err);
1915                 } else {
1916                         dsa_port_bridge_leave(dp, info->upper_dev);
1917                         err = NOTIFY_OK;
1918                 }
1919         }
1920
1921         return err;
1922 }
1923
1924 static int
1925 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
1926                                  struct netdev_notifier_changeupper_info *info)
1927 {
1928         struct netlink_ext_ack *ext_ack;
1929         struct net_device *slave;
1930         struct dsa_port *dp;
1931
1932         ext_ack = netdev_notifier_info_to_extack(&info->info);
1933
1934         if (!is_vlan_dev(dev))
1935                 return NOTIFY_DONE;
1936
1937         slave = vlan_dev_real_dev(dev);
1938         if (!dsa_slave_dev_check(slave))
1939                 return NOTIFY_DONE;
1940
1941         dp = dsa_slave_to_port(slave);
1942         if (!dp->bridge_dev)
1943                 return NOTIFY_DONE;
1944
1945         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1946         if (br_vlan_enabled(dp->bridge_dev) &&
1947             netif_is_bridge_master(info->upper_dev) && info->linking) {
1948                 NL_SET_ERR_MSG_MOD(ext_ack,
1949                                    "Cannot enslave VLAN device into VLAN aware bridge");
1950                 return notifier_from_errno(-EINVAL);
1951         }
1952
1953         return NOTIFY_DONE;
1954 }
1955
1956 static int
1957 dsa_slave_check_8021q_upper(struct net_device *dev,
1958                             struct netdev_notifier_changeupper_info *info)
1959 {
1960         struct dsa_port *dp = dsa_slave_to_port(dev);
1961         struct net_device *br = dp->bridge_dev;
1962         struct bridge_vlan_info br_info;
1963         struct netlink_ext_ack *extack;
1964         int err = NOTIFY_DONE;
1965         u16 vid;
1966
1967         if (!br || !br_vlan_enabled(br))
1968                 return NOTIFY_DONE;
1969
1970         extack = netdev_notifier_info_to_extack(&info->info);
1971         vid = vlan_dev_vlan_id(info->upper_dev);
1972
1973         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1974          * device, respectively the VID is not found, returning
1975          * 0 means success, which is a failure for us here.
1976          */
1977         err = br_vlan_get_info(br, vid, &br_info);
1978         if (err == 0) {
1979                 NL_SET_ERR_MSG_MOD(extack,
1980                                    "This VLAN is already configured by the bridge");
1981                 return notifier_from_errno(-EBUSY);
1982         }
1983
1984         return NOTIFY_DONE;
1985 }
1986
1987 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1988                                      unsigned long event, void *ptr)
1989 {
1990         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1991
1992         switch (event) {
1993         case NETDEV_PRECHANGEUPPER: {
1994                 struct netdev_notifier_changeupper_info *info = ptr;
1995                 struct dsa_switch *ds;
1996                 struct dsa_port *dp;
1997                 int err;
1998
1999                 if (!dsa_slave_dev_check(dev))
2000                         return dsa_prevent_bridging_8021q_upper(dev, ptr);
2001
2002                 dp = dsa_slave_to_port(dev);
2003                 ds = dp->ds;
2004
2005                 if (ds->ops->port_prechangeupper) {
2006                         err = ds->ops->port_prechangeupper(ds, dp->index, info);
2007                         if (err)
2008                                 return notifier_from_errno(err);
2009                 }
2010
2011                 if (is_vlan_dev(info->upper_dev))
2012                         return dsa_slave_check_8021q_upper(dev, ptr);
2013                 break;
2014         }
2015         case NETDEV_CHANGEUPPER:
2016                 if (!dsa_slave_dev_check(dev))
2017                         return NOTIFY_DONE;
2018
2019                 return dsa_slave_changeupper(dev, ptr);
2020         }
2021
2022         return NOTIFY_DONE;
2023 }
2024
2025 static void
2026 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2027 {
2028         struct dsa_switch *ds = switchdev_work->ds;
2029         struct switchdev_notifier_fdb_info info;
2030         struct dsa_port *dp;
2031
2032         if (!dsa_is_user_port(ds, switchdev_work->port))
2033                 return;
2034
2035         info.addr = switchdev_work->addr;
2036         info.vid = switchdev_work->vid;
2037         info.offloaded = true;
2038         dp = dsa_to_port(ds, switchdev_work->port);
2039         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2040                                  dp->slave, &info.info, NULL);
2041 }
2042
2043 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2044 {
2045         struct dsa_switchdev_event_work *switchdev_work =
2046                 container_of(work, struct dsa_switchdev_event_work, work);
2047         struct dsa_switch *ds = switchdev_work->ds;
2048         struct dsa_port *dp;
2049         int err;
2050
2051         dp = dsa_to_port(ds, switchdev_work->port);
2052
2053         rtnl_lock();
2054         switch (switchdev_work->event) {
2055         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2056                 err = dsa_port_fdb_add(dp, switchdev_work->addr,
2057                                        switchdev_work->vid);
2058                 if (err) {
2059                         dev_err(ds->dev,
2060                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2061                                 dp->index, switchdev_work->addr,
2062                                 switchdev_work->vid, err);
2063                         break;
2064                 }
2065                 dsa_fdb_offload_notify(switchdev_work);
2066                 break;
2067
2068         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2069                 err = dsa_port_fdb_del(dp, switchdev_work->addr,
2070                                        switchdev_work->vid);
2071                 if (err) {
2072                         dev_err(ds->dev,
2073                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2074                                 dp->index, switchdev_work->addr,
2075                                 switchdev_work->vid, err);
2076                 }
2077
2078                 break;
2079         }
2080         rtnl_unlock();
2081
2082         kfree(switchdev_work);
2083         if (dsa_is_user_port(ds, dp->index))
2084                 dev_put(dp->slave);
2085 }
2086
2087 static int dsa_lower_dev_walk(struct net_device *lower_dev,
2088                               struct netdev_nested_priv *priv)
2089 {
2090         if (dsa_slave_dev_check(lower_dev)) {
2091                 priv->data = (void *)netdev_priv(lower_dev);
2092                 return 1;
2093         }
2094
2095         return 0;
2096 }
2097
2098 static struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev)
2099 {
2100         struct netdev_nested_priv priv = {
2101                 .data = NULL,
2102         };
2103
2104         netdev_walk_all_lower_dev_rcu(dev, dsa_lower_dev_walk, &priv);
2105
2106         return (struct dsa_slave_priv *)priv.data;
2107 }
2108
2109 /* Called under rcu_read_lock() */
2110 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2111                                      unsigned long event, void *ptr)
2112 {
2113         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2114         const struct switchdev_notifier_fdb_info *fdb_info;
2115         struct dsa_switchdev_event_work *switchdev_work;
2116         struct dsa_port *dp;
2117         int err;
2118
2119         switch (event) {
2120         case SWITCHDEV_PORT_ATTR_SET:
2121                 err = switchdev_handle_port_attr_set(dev, ptr,
2122                                                      dsa_slave_dev_check,
2123                                                      dsa_slave_port_attr_set);
2124                 return notifier_from_errno(err);
2125         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2126         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2127                 fdb_info = ptr;
2128
2129                 if (dsa_slave_dev_check(dev)) {
2130                         if (!fdb_info->added_by_user)
2131                                 return NOTIFY_OK;
2132
2133                         dp = dsa_slave_to_port(dev);
2134                 } else {
2135                         /* Snoop addresses learnt on foreign interfaces
2136                          * bridged with us, for switches that don't
2137                          * automatically learn SA from CPU-injected traffic
2138                          */
2139                         struct net_device *br_dev;
2140                         struct dsa_slave_priv *p;
2141
2142                         br_dev = netdev_master_upper_dev_get_rcu(dev);
2143                         if (!br_dev)
2144                                 return NOTIFY_DONE;
2145
2146                         if (!netif_is_bridge_master(br_dev))
2147                                 return NOTIFY_DONE;
2148
2149                         p = dsa_slave_dev_lower_find(br_dev);
2150                         if (!p)
2151                                 return NOTIFY_DONE;
2152
2153                         dp = p->dp->cpu_dp;
2154
2155                         if (!dp->ds->assisted_learning_on_cpu_port)
2156                                 return NOTIFY_DONE;
2157                 }
2158
2159                 if (!dp->ds->ops->port_fdb_add || !dp->ds->ops->port_fdb_del)
2160                         return NOTIFY_DONE;
2161
2162                 switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2163                 if (!switchdev_work)
2164                         return NOTIFY_BAD;
2165
2166                 INIT_WORK(&switchdev_work->work,
2167                           dsa_slave_switchdev_event_work);
2168                 switchdev_work->ds = dp->ds;
2169                 switchdev_work->port = dp->index;
2170                 switchdev_work->event = event;
2171
2172                 ether_addr_copy(switchdev_work->addr,
2173                                 fdb_info->addr);
2174                 switchdev_work->vid = fdb_info->vid;
2175
2176                 /* Hold a reference on the slave for dsa_fdb_offload_notify */
2177                 if (dsa_is_user_port(dp->ds, dp->index))
2178                         dev_hold(dev);
2179                 dsa_schedule_work(&switchdev_work->work);
2180                 break;
2181         default:
2182                 return NOTIFY_DONE;
2183         }
2184
2185         return NOTIFY_OK;
2186 }
2187
2188 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2189                                               unsigned long event, void *ptr)
2190 {
2191         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2192         int err;
2193
2194         switch (event) {
2195         case SWITCHDEV_PORT_OBJ_ADD:
2196                 err = switchdev_handle_port_obj_add(dev, ptr,
2197                                                     dsa_slave_dev_check,
2198                                                     dsa_slave_port_obj_add);
2199                 return notifier_from_errno(err);
2200         case SWITCHDEV_PORT_OBJ_DEL:
2201                 err = switchdev_handle_port_obj_del(dev, ptr,
2202                                                     dsa_slave_dev_check,
2203                                                     dsa_slave_port_obj_del);
2204                 return notifier_from_errno(err);
2205         case SWITCHDEV_PORT_ATTR_SET:
2206                 err = switchdev_handle_port_attr_set(dev, ptr,
2207                                                      dsa_slave_dev_check,
2208                                                      dsa_slave_port_attr_set);
2209                 return notifier_from_errno(err);
2210         }
2211
2212         return NOTIFY_DONE;
2213 }
2214
2215 static struct notifier_block dsa_slave_nb __read_mostly = {
2216         .notifier_call  = dsa_slave_netdevice_event,
2217 };
2218
2219 static struct notifier_block dsa_slave_switchdev_notifier = {
2220         .notifier_call = dsa_slave_switchdev_event,
2221 };
2222
2223 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2224         .notifier_call = dsa_slave_switchdev_blocking_event,
2225 };
2226
2227 int dsa_slave_register_notifier(void)
2228 {
2229         struct notifier_block *nb;
2230         int err;
2231
2232         err = register_netdevice_notifier(&dsa_slave_nb);
2233         if (err)
2234                 return err;
2235
2236         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2237         if (err)
2238                 goto err_switchdev_nb;
2239
2240         nb = &dsa_slave_switchdev_blocking_notifier;
2241         err = register_switchdev_blocking_notifier(nb);
2242         if (err)
2243                 goto err_switchdev_blocking_nb;
2244
2245         return 0;
2246
2247 err_switchdev_blocking_nb:
2248         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2249 err_switchdev_nb:
2250         unregister_netdevice_notifier(&dsa_slave_nb);
2251         return err;
2252 }
2253
2254 void dsa_slave_unregister_notifier(void)
2255 {
2256         struct notifier_block *nb;
2257         int err;
2258
2259         nb = &dsa_slave_switchdev_blocking_notifier;
2260         err = unregister_switchdev_blocking_notifier(nb);
2261         if (err)
2262                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2263
2264         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2265         if (err)
2266                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2267
2268         err = unregister_netdevice_notifier(&dsa_slave_nb);
2269         if (err)
2270                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2271 }