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