net/dsa/slave.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/dsa/slave.c - Slave device handling
   4  * Copyright (c) 2008-2009 Marvell Semiconductor
   5  */
   6
   7 #include <linux/list.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/phy.h>
  11 #include <linux/phy_fixed.h>
  12 #include <linux/phylink.h>
  13 #include <linux/of_net.h>
  14 #include <linux/of_mdio.h>
  15 #include <linux/mdio.h>
  16 #include <net/rtnetlink.h>
  17 #include <net/pkt_cls.h>
  18 #include <net/tc_act/tc_mirred.h>
  19 #include <linux/if_bridge.h>
  20 #include <linux/if_hsr.h>
  21 #include <linux/netpoll.h>
  22 #include <linux/ptp_classify.h>
  23
  24 #include "dsa_priv.h"
  25
  26 /* slave mii_bus handling ***************************************************/
  27 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  28 {
  29         struct dsa_switch *ds = bus->priv;
  30
  31         if (ds->phys_mii_mask & (1 << addr))
  32                 return ds->ops->phy_read(ds, addr, reg);
  33
  34         return 0xffff;
  35 }
  36
  37 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  38 {
  39         struct dsa_switch *ds = bus->priv;
  40
  41         if (ds->phys_mii_mask & (1 << addr))
  42                 return ds->ops->phy_write(ds, addr, reg, val);
  43
  44         return 0;
  45 }
  46
  47 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  48 {
  49         ds->slave_mii_bus->priv = (void *)ds;
  50         ds->slave_mii_bus->name = "dsa slave smi";
  51         ds->slave_mii_bus->read = dsa_slave_phy_read;
  52         ds->slave_mii_bus->write = dsa_slave_phy_write;
  53         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  54                  ds->dst->index, ds->index);
  55         ds->slave_mii_bus->parent = ds->dev;
  56         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  57 }
  58
  59
  60 /* slave device handling ****************************************************/
  61 static int dsa_slave_get_iflink(const struct net_device *dev)
  62 {
  63         return dsa_slave_to_master(dev)->ifindex;
  64 }
  65
  66 static int dsa_slave_open(struct net_device *dev)
  67 {
  68         struct net_device *master = dsa_slave_to_master(dev);
  69         struct dsa_port *dp = dsa_slave_to_port(dev);
  70         int err;
  71
  72         err = dev_open(master, NULL);
  73         if (err < 0) {
  74                 netdev_err(dev, "failed to open master %s\n", master->name);
  75                 goto out;
  76         }
  77
  78         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  79                 err = dev_uc_add(master, dev->dev_addr);
  80                 if (err < 0)
  81                         goto out;
  82         }
  83
  84         if (dev->flags & IFF_ALLMULTI) {
  85                 err = dev_set_allmulti(master, 1);
  86                 if (err < 0)
  87                         goto del_unicast;
  88         }
  89         if (dev->flags & IFF_PROMISC) {
  90                 err = dev_set_promiscuity(master, 1);
  91                 if (err < 0)
  92                         goto clear_allmulti;
  93         }
  94
  95         err = dsa_port_enable_rt(dp, dev->phydev);
  96         if (err)
  97                 goto clear_promisc;
  98
  99         return 0;
 100
 101 clear_promisc:
 102         if (dev->flags & IFF_PROMISC)
 103                 dev_set_promiscuity(master, -1);
 104 clear_allmulti:
 105         if (dev->flags & IFF_ALLMULTI)
 106                 dev_set_allmulti(master, -1);
 107 del_unicast:
 108         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 109                 dev_uc_del(master, dev->dev_addr);
 110 out:
 111         return err;
 112 }
 113
 114 static int dsa_slave_close(struct net_device *dev)
 115 {
 116         struct net_device *master = dsa_slave_to_master(dev);
 117         struct dsa_port *dp = dsa_slave_to_port(dev);
 118
 119         dsa_port_disable_rt(dp);
 120
 121         dev_mc_unsync(master, dev);
 122         dev_uc_unsync(master, dev);
 123         if (dev->flags & IFF_ALLMULTI)
 124                 dev_set_allmulti(master, -1);
 125         if (dev->flags & IFF_PROMISC)
 126                 dev_set_promiscuity(master, -1);
 127
 128         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 129                 dev_uc_del(master, dev->dev_addr);
 130
 131         return 0;
 132 }
 133
 134 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 135 {
 136         struct net_device *master = dsa_slave_to_master(dev);
 137         if (dev->flags & IFF_UP) {
 138                 if (change & IFF_ALLMULTI)
 139                         dev_set_allmulti(master,
 140                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 141                 if (change & IFF_PROMISC)
 142                         dev_set_promiscuity(master,
 143                                             dev->flags & IFF_PROMISC ? 1 : -1);
 144         }
 145 }
 146
 147 static void dsa_slave_set_rx_mode(struct net_device *dev)
 148 {
 149         struct net_device *master = dsa_slave_to_master(dev);
 150
 151         dev_mc_sync(master, dev);
 152         dev_uc_sync(master, dev);
 153 }
 154
 155 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 156 {
 157         struct net_device *master = dsa_slave_to_master(dev);
 158         struct sockaddr *addr = a;
 159         int err;
 160
 161         if (!is_valid_ether_addr(addr->sa_data))
 162                 return -EADDRNOTAVAIL;
 163
 164         if (!(dev->flags & IFF_UP))
 165                 goto out;
 166
 167         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 168                 err = dev_uc_add(master, addr->sa_data);
 169                 if (err < 0)
 170                         return err;
 171         }
 172
 173         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 174                 dev_uc_del(master, dev->dev_addr);
 175
 176 out:
 177         ether_addr_copy(dev->dev_addr, addr->sa_data);
 178
 179         return 0;
 180 }
 181
 182 struct dsa_slave_dump_ctx {
 183         struct net_device *dev;
 184         struct sk_buff *skb;
 185         struct netlink_callback *cb;
 186         int idx;
 187 };
 188
 189 static int
 190 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 191                            bool is_static, void *data)
 192 {
 193         struct dsa_slave_dump_ctx *dump = data;
 194         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 195         u32 seq = dump->cb->nlh->nlmsg_seq;
 196         struct nlmsghdr *nlh;
 197         struct ndmsg *ndm;
 198
 199         if (dump->idx < dump->cb->args[2])
 200                 goto skip;
 201
 202         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 203                         sizeof(*ndm), NLM_F_MULTI);
 204         if (!nlh)
 205                 return -EMSGSIZE;
 206
 207         ndm = nlmsg_data(nlh);
 208         ndm->ndm_family  = AF_BRIDGE;
 209         ndm->ndm_pad1    = 0;
 210         ndm->ndm_pad2    = 0;
 211         ndm->ndm_flags   = NTF_SELF;
 212         ndm->ndm_type    = 0;
 213         ndm->ndm_ifindex = dump->dev->ifindex;
 214         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 215
 216         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 217                 goto nla_put_failure;
 218
 219         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 220                 goto nla_put_failure;
 221
 222         nlmsg_end(dump->skb, nlh);
 223
 224 skip:
 225         dump->idx++;
 226         return 0;
 227
 228 nla_put_failure:
 229         nlmsg_cancel(dump->skb, nlh);
 230         return -EMSGSIZE;
 231 }
 232
 233 static int
 234 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 235                    struct net_device *dev, struct net_device *filter_dev,
 236                    int *idx)
 237 {
 238         struct dsa_port *dp = dsa_slave_to_port(dev);
 239         struct dsa_slave_dump_ctx dump = {
 240                 .dev = dev,
 241                 .skb = skb,
 242                 .cb = cb,
 243                 .idx = *idx,
 244         };
 245         int err;
 246
 247         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 248         *idx = dump.idx;
 249
 250         return err;
 251 }
 252
 253 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 254 {
 255         struct dsa_slave_priv *p = netdev_priv(dev);
 256         struct dsa_switch *ds = p->dp->ds;
 257         int port = p->dp->index;
 258
 259         /* Pass through to switch driver if it supports timestamping */
 260         switch (cmd) {
 261         case SIOCGHWTSTAMP:
 262                 if (ds->ops->port_hwtstamp_get)
 263                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 264                 break;
 265         case SIOCSHWTSTAMP:
 266                 if (ds->ops->port_hwtstamp_set)
 267                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 268                 break;
 269         }
 270
 271         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 272 }
 273
 274 static int dsa_slave_port_attr_set(struct net_device *dev,
 275                                    const struct switchdev_attr *attr,
 276                                    struct netlink_ext_ack *extack)
 277 {
 278         struct dsa_port *dp = dsa_slave_to_port(dev);
 279         int ret;
 280
 281         switch (attr->id) {
 282         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 283                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 284                         return -EOPNOTSUPP;
 285
 286                 ret = dsa_port_set_state(dp, attr->u.stp_state);
 287                 break;
 288         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 289                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 290                         return -EOPNOTSUPP;
 291
 292                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 293                                               extack);
 294                 break;
 295         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 296                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 297                         return -EOPNOTSUPP;
 298
 299                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 300                 break;
 301         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 302                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 303                         return -EOPNOTSUPP;
 304
 305                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 306                                                 extack);
 307                 break;
 308         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 309                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 310                         return -EOPNOTSUPP;
 311
 312                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 313                 break;
 314         case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 315                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 316                         return -EOPNOTSUPP;
 317
 318                 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, extack);
 319                 break;
 320         default:
 321                 ret = -EOPNOTSUPP;
 322                 break;
 323         }
 324
 325         return ret;
 326 }
 327
 328 /* Must be called under rcu_read_lock() */
 329 static int
 330 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 331                                       const struct switchdev_obj_port_vlan *vlan)
 332 {
 333         struct net_device *upper_dev;
 334         struct list_head *iter;
 335
 336         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 337                 u16 vid;
 338
 339                 if (!is_vlan_dev(upper_dev))
 340                         continue;
 341
 342                 vid = vlan_dev_vlan_id(upper_dev);
 343                 if (vid == vlan->vid)
 344                         return -EBUSY;
 345         }
 346
 347         return 0;
 348 }
 349
 350 static int dsa_slave_vlan_add(struct net_device *dev,
 351                               const struct switchdev_obj *obj,
 352                               struct netlink_ext_ack *extack)
 353 {
 354         struct net_device *master = dsa_slave_to_master(dev);
 355         struct dsa_port *dp = dsa_slave_to_port(dev);
 356         struct switchdev_obj_port_vlan vlan;
 357         int err;
 358
 359         if (dsa_port_skip_vlan_configuration(dp)) {
 360                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 361                 return 0;
 362         }
 363
 364         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 365
 366         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 367          * the same VID.
 368          */
 369         if (br_vlan_enabled(dp->bridge_dev)) {
 370                 rcu_read_lock();
 371                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
 372                 rcu_read_unlock();
 373                 if (err) {
 374                         NL_SET_ERR_MSG_MOD(extack,
 375                                            "Port already has a VLAN upper with this VID");
 376                         return err;
 377                 }
 378         }
 379
 380         err = dsa_port_vlan_add(dp, &vlan, extack);
 381         if (err)
 382                 return err;
 383
 384         /* We need the dedicated CPU port to be a member of the VLAN as well.
 385          * Even though drivers often handle CPU membership in special ways,
 386          * it doesn't make sense to program a PVID, so clear this flag.
 387          */
 388         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 389
 390         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, extack);
 391         if (err)
 392                 return err;
 393
 394         return vlan_vid_add(master, htons(ETH_P_8021Q), vlan.vid);
 395 }
 396
 397 static int dsa_slave_port_obj_add(struct net_device *dev,
 398                                   const struct switchdev_obj *obj,
 399                                   struct netlink_ext_ack *extack)
 400 {
 401         struct dsa_port *dp = dsa_slave_to_port(dev);
 402         int err;
 403
 404         switch (obj->id) {
 405         case SWITCHDEV_OBJ_ID_PORT_MDB:
 406                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 407                         return -EOPNOTSUPP;
 408
 409                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 410                 break;
 411         case SWITCHDEV_OBJ_ID_HOST_MDB:
 412                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 413                         return -EOPNOTSUPP;
 414
 415                 /* DSA can directly translate this to a normal MDB add,
 416                  * but on the CPU port.
 417                  */
 418                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 419                 break;
 420         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 421                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 422                         return -EOPNOTSUPP;
 423
 424                 err = dsa_slave_vlan_add(dev, obj, extack);
 425                 break;
 426         case SWITCHDEV_OBJ_ID_MRP:
 427                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 428                         return -EOPNOTSUPP;
 429
 430                 err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 431                 break;
 432         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 433                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 434                         return -EOPNOTSUPP;
 435
 436                 err = dsa_port_mrp_add_ring_role(dp,
 437                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 438                 break;
 439         default:
 440                 err = -EOPNOTSUPP;
 441                 break;
 442         }
 443
 444         return err;
 445 }
 446
 447 static int dsa_slave_vlan_del(struct net_device *dev,
 448                               const struct switchdev_obj *obj)
 449 {
 450         struct net_device *master = dsa_slave_to_master(dev);
 451         struct dsa_port *dp = dsa_slave_to_port(dev);
 452         struct switchdev_obj_port_vlan *vlan;
 453         int err;
 454
 455         if (dsa_port_skip_vlan_configuration(dp))
 456                 return 0;
 457
 458         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 459
 460         /* Do not deprogram the CPU port as it may be shared with other user
 461          * ports which can be members of this VLAN as well.
 462          */
 463         err = dsa_port_vlan_del(dp, vlan);
 464         if (err)
 465                 return err;
 466
 467         vlan_vid_del(master, htons(ETH_P_8021Q), vlan->vid);
 468
 469         return 0;
 470 }
 471
 472 static int dsa_slave_port_obj_del(struct net_device *dev,
 473                                   const struct switchdev_obj *obj)
 474 {
 475         struct dsa_port *dp = dsa_slave_to_port(dev);
 476         int err;
 477
 478         switch (obj->id) {
 479         case SWITCHDEV_OBJ_ID_PORT_MDB:
 480                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 481                         return -EOPNOTSUPP;
 482
 483                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 484                 break;
 485         case SWITCHDEV_OBJ_ID_HOST_MDB:
 486                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 487                         return -EOPNOTSUPP;
 488
 489                 /* DSA can directly translate this to a normal MDB add,
 490                  * but on the CPU port.
 491                  */
 492                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 493                 break;
 494         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 495                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 496                         return -EOPNOTSUPP;
 497
 498                 err = dsa_slave_vlan_del(dev, obj);
 499                 break;
 500         case SWITCHDEV_OBJ_ID_MRP:
 501                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 502                         return -EOPNOTSUPP;
 503
 504                 err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 505                 break;
 506         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 507                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 508                         return -EOPNOTSUPP;
 509
 510                 err = dsa_port_mrp_del_ring_role(dp,
 511                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 512                 break;
 513         default:
 514                 err = -EOPNOTSUPP;
 515                 break;
 516         }
 517
 518         return err;
 519 }
 520
 521 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 522                                         struct netdev_phys_item_id *ppid)
 523 {
 524         struct dsa_port *dp = dsa_slave_to_port(dev);
 525         struct dsa_switch *ds = dp->ds;
 526         struct dsa_switch_tree *dst = ds->dst;
 527
 528         /* For non-legacy ports, devlink is used and it takes
 529          * care of the name generation. This ndo implementation
 530          * should be removed with legacy support.
 531          */
 532         if (dp->ds->devlink)
 533                 return -EOPNOTSUPP;
 534
 535         ppid->id_len = sizeof(dst->index);
 536         memcpy(&ppid->id, &dst->index, ppid->id_len);
 537
 538         return 0;
 539 }
 540
 541 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 542                                                      struct sk_buff *skb)
 543 {
 544 #ifdef CONFIG_NET_POLL_CONTROLLER
 545         struct dsa_slave_priv *p = netdev_priv(dev);
 546
 547         return netpoll_send_skb(p->netpoll, skb);
 548 #else
 549         BUG();
 550         return NETDEV_TX_OK;
 551 #endif
 552 }
 553
 554 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 555                                  struct sk_buff *skb)
 556 {
 557         struct dsa_switch *ds = p->dp->ds;
 558         struct sk_buff *clone;
 559         unsigned int type;
 560
 561         type = ptp_classify_raw(skb);
 562         if (type == PTP_CLASS_NONE)
 563                 return;
 564
 565         if (!ds->ops->port_txtstamp)
 566                 return;
 567
 568         clone = skb_clone_sk(skb);
 569         if (!clone)
 570                 return;
 571
 572         if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type)) {
 573                 DSA_SKB_CB(skb)->clone = clone;
 574                 return;
 575         }
 576
 577         kfree_skb(clone);
 578 }
 579
 580 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 581 {
 582         /* SKB for netpoll still need to be mangled with the protocol-specific
 583          * tag to be successfully transmitted
 584          */
 585         if (unlikely(netpoll_tx_running(dev)))
 586                 return dsa_slave_netpoll_send_skb(dev, skb);
 587
 588         /* Queue the SKB for transmission on the parent interface, but
 589          * do not modify its EtherType
 590          */
 591         skb->dev = dsa_slave_to_master(dev);
 592         dev_queue_xmit(skb);
 593
 594         return NETDEV_TX_OK;
 595 }
 596 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 597
 598 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 599 {
 600         int needed_headroom = dev->needed_headroom;
 601         int needed_tailroom = dev->needed_tailroom;
 602
 603         /* For tail taggers, we need to pad short frames ourselves, to ensure
 604          * that the tail tag does not fail at its role of being at the end of
 605          * the packet, once the master interface pads the frame. Account for
 606          * that pad length here, and pad later.
 607          */
 608         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 609                 needed_tailroom += ETH_ZLEN - skb->len;
 610         /* skb_headroom() returns unsigned int... */
 611         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 612         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 613
 614         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 615                 /* No reallocation needed, yay! */
 616                 return 0;
 617
 618         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 619                                 GFP_ATOMIC);
 620 }
 621
 622 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 623 {
 624         struct dsa_slave_priv *p = netdev_priv(dev);
 625         struct sk_buff *nskb;
 626
 627         dev_sw_netstats_tx_add(dev, 1, skb->len);
 628
 629         DSA_SKB_CB(skb)->clone = NULL;
 630
 631         /* Identify PTP protocol packets, clone them, and pass them to the
 632          * switch driver
 633          */
 634         dsa_skb_tx_timestamp(p, skb);
 635
 636         if (dsa_realloc_skb(skb, dev)) {
 637                 dev_kfree_skb_any(skb);
 638                 return NETDEV_TX_OK;
 639         }
 640
 641         /* needed_tailroom should still be 'warm' in the cache line from
 642          * dsa_realloc_skb(), which has also ensured that padding is safe.
 643          */
 644         if (dev->needed_tailroom)
 645                 eth_skb_pad(skb);
 646
 647         /* Transmit function may have to reallocate the original SKB,
 648          * in which case it must have freed it. Only free it here on error.
 649          */
 650         nskb = p->xmit(skb, dev);
 651         if (!nskb) {
 652                 kfree_skb(skb);
 653                 return NETDEV_TX_OK;
 654         }
 655
 656         return dsa_enqueue_skb(nskb, dev);
 657 }
 658
 659 /* ethtool operations *******************************************************/
 660
 661 static void dsa_slave_get_drvinfo(struct net_device *dev,
 662                                   struct ethtool_drvinfo *drvinfo)
 663 {
 664         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 665         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 666         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 667 }
 668
 669 static int dsa_slave_get_regs_len(struct net_device *dev)
 670 {
 671         struct dsa_port *dp = dsa_slave_to_port(dev);
 672         struct dsa_switch *ds = dp->ds;
 673
 674         if (ds->ops->get_regs_len)
 675                 return ds->ops->get_regs_len(ds, dp->index);
 676
 677         return -EOPNOTSUPP;
 678 }
 679
 680 static void
 681 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 682 {
 683         struct dsa_port *dp = dsa_slave_to_port(dev);
 684         struct dsa_switch *ds = dp->ds;
 685
 686         if (ds->ops->get_regs)
 687                 ds->ops->get_regs(ds, dp->index, regs, _p);
 688 }
 689
 690 static int dsa_slave_nway_reset(struct net_device *dev)
 691 {
 692         struct dsa_port *dp = dsa_slave_to_port(dev);
 693
 694         return phylink_ethtool_nway_reset(dp->pl);
 695 }
 696
 697 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 698 {
 699         struct dsa_port *dp = dsa_slave_to_port(dev);
 700         struct dsa_switch *ds = dp->ds;
 701
 702         if (ds->cd && ds->cd->eeprom_len)
 703                 return ds->cd->eeprom_len;
 704
 705         if (ds->ops->get_eeprom_len)
 706                 return ds->ops->get_eeprom_len(ds);
 707
 708         return 0;
 709 }
 710
 711 static int dsa_slave_get_eeprom(struct net_device *dev,
 712                                 struct ethtool_eeprom *eeprom, u8 *data)
 713 {
 714         struct dsa_port *dp = dsa_slave_to_port(dev);
 715         struct dsa_switch *ds = dp->ds;
 716
 717         if (ds->ops->get_eeprom)
 718                 return ds->ops->get_eeprom(ds, eeprom, data);
 719
 720         return -EOPNOTSUPP;
 721 }
 722
 723 static int dsa_slave_set_eeprom(struct net_device *dev,
 724                                 struct ethtool_eeprom *eeprom, u8 *data)
 725 {
 726         struct dsa_port *dp = dsa_slave_to_port(dev);
 727         struct dsa_switch *ds = dp->ds;
 728
 729         if (ds->ops->set_eeprom)
 730                 return ds->ops->set_eeprom(ds, eeprom, data);
 731
 732         return -EOPNOTSUPP;
 733 }
 734
 735 static void dsa_slave_get_strings(struct net_device *dev,
 736                                   uint32_t stringset, uint8_t *data)
 737 {
 738         struct dsa_port *dp = dsa_slave_to_port(dev);
 739         struct dsa_switch *ds = dp->ds;
 740
 741         if (stringset == ETH_SS_STATS) {
 742                 int len = ETH_GSTRING_LEN;
 743
 744                 strncpy(data, "tx_packets", len);
 745                 strncpy(data + len, "tx_bytes", len);
 746                 strncpy(data + 2 * len, "rx_packets", len);
 747                 strncpy(data + 3 * len, "rx_bytes", len);
 748                 if (ds->ops->get_strings)
 749                         ds->ops->get_strings(ds, dp->index, stringset,
 750                                              data + 4 * len);
 751         }
 752 }
 753
 754 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 755                                         struct ethtool_stats *stats,
 756                                         uint64_t *data)
 757 {
 758         struct dsa_port *dp = dsa_slave_to_port(dev);
 759         struct dsa_switch *ds = dp->ds;
 760         struct pcpu_sw_netstats *s;
 761         unsigned int start;
 762         int i;
 763
 764         for_each_possible_cpu(i) {
 765                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 766
 767                 s = per_cpu_ptr(dev->tstats, i);
 768                 do {
 769                         start = u64_stats_fetch_begin_irq(&s->syncp);
 770                         tx_packets = s->tx_packets;
 771                         tx_bytes = s->tx_bytes;
 772                         rx_packets = s->rx_packets;
 773                         rx_bytes = s->rx_bytes;
 774                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 775                 data[0] += tx_packets;
 776                 data[1] += tx_bytes;
 777                 data[2] += rx_packets;
 778                 data[3] += rx_bytes;
 779         }
 780         if (ds->ops->get_ethtool_stats)
 781                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 782 }
 783
 784 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 785 {
 786         struct dsa_port *dp = dsa_slave_to_port(dev);
 787         struct dsa_switch *ds = dp->ds;
 788
 789         if (sset == ETH_SS_STATS) {
 790                 int count;
 791
 792                 count = 4;
 793                 if (ds->ops->get_sset_count)
 794                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 795
 796                 return count;
 797         }
 798
 799         return -EOPNOTSUPP;
 800 }
 801
 802 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 803 {
 804         struct dsa_port *dp = dsa_slave_to_port(dev);
 805         struct dsa_switch *ds = dp->ds;
 806
 807         phylink_ethtool_get_wol(dp->pl, w);
 808
 809         if (ds->ops->get_wol)
 810                 ds->ops->get_wol(ds, dp->index, w);
 811 }
 812
 813 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 814 {
 815         struct dsa_port *dp = dsa_slave_to_port(dev);
 816         struct dsa_switch *ds = dp->ds;
 817         int ret = -EOPNOTSUPP;
 818
 819         phylink_ethtool_set_wol(dp->pl, w);
 820
 821         if (ds->ops->set_wol)
 822                 ret = ds->ops->set_wol(ds, dp->index, w);
 823
 824         return ret;
 825 }
 826
 827 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 828 {
 829         struct dsa_port *dp = dsa_slave_to_port(dev);
 830         struct dsa_switch *ds = dp->ds;
 831         int ret;
 832
 833         /* Port's PHY and MAC both need to be EEE capable */
 834         if (!dev->phydev || !dp->pl)
 835                 return -ENODEV;
 836
 837         if (!ds->ops->set_mac_eee)
 838                 return -EOPNOTSUPP;
 839
 840         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 841         if (ret)
 842                 return ret;
 843
 844         return phylink_ethtool_set_eee(dp->pl, e);
 845 }
 846
 847 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 848 {
 849         struct dsa_port *dp = dsa_slave_to_port(dev);
 850         struct dsa_switch *ds = dp->ds;
 851         int ret;
 852
 853         /* Port's PHY and MAC both need to be EEE capable */
 854         if (!dev->phydev || !dp->pl)
 855                 return -ENODEV;
 856
 857         if (!ds->ops->get_mac_eee)
 858                 return -EOPNOTSUPP;
 859
 860         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 861         if (ret)
 862                 return ret;
 863
 864         return phylink_ethtool_get_eee(dp->pl, e);
 865 }
 866
 867 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 868                                         struct ethtool_link_ksettings *cmd)
 869 {
 870         struct dsa_port *dp = dsa_slave_to_port(dev);
 871
 872         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 873 }
 874
 875 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 876                                         const struct ethtool_link_ksettings *cmd)
 877 {
 878         struct dsa_port *dp = dsa_slave_to_port(dev);
 879
 880         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 881 }
 882
 883 static void dsa_slave_get_pauseparam(struct net_device *dev,
 884                                      struct ethtool_pauseparam *pause)
 885 {
 886         struct dsa_port *dp = dsa_slave_to_port(dev);
 887
 888         phylink_ethtool_get_pauseparam(dp->pl, pause);
 889 }
 890
 891 static int dsa_slave_set_pauseparam(struct net_device *dev,
 892                                     struct ethtool_pauseparam *pause)
 893 {
 894         struct dsa_port *dp = dsa_slave_to_port(dev);
 895
 896         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 897 }
 898
 899 #ifdef CONFIG_NET_POLL_CONTROLLER
 900 static int dsa_slave_netpoll_setup(struct net_device *dev,
 901                                    struct netpoll_info *ni)
 902 {
 903         struct net_device *master = dsa_slave_to_master(dev);
 904         struct dsa_slave_priv *p = netdev_priv(dev);
 905         struct netpoll *netpoll;
 906         int err = 0;
 907
 908         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 909         if (!netpoll)
 910                 return -ENOMEM;
 911
 912         err = __netpoll_setup(netpoll, master);
 913         if (err) {
 914                 kfree(netpoll);
 915                 goto out;
 916         }
 917
 918         p->netpoll = netpoll;
 919 out:
 920         return err;
 921 }
 922
 923 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 924 {
 925         struct dsa_slave_priv *p = netdev_priv(dev);
 926         struct netpoll *netpoll = p->netpoll;
 927
 928         if (!netpoll)
 929                 return;
 930
 931         p->netpoll = NULL;
 932
 933         __netpoll_free(netpoll);
 934 }
 935
 936 static void dsa_slave_poll_controller(struct net_device *dev)
 937 {
 938 }
 939 #endif
 940
 941 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 942                                         char *name, size_t len)
 943 {
 944         struct dsa_port *dp = dsa_slave_to_port(dev);
 945
 946         /* For non-legacy ports, devlink is used and it takes
 947          * care of the name generation. This ndo implementation
 948          * should be removed with legacy support.
 949          */
 950         if (dp->ds->devlink)
 951                 return -EOPNOTSUPP;
 952
 953         if (snprintf(name, len, "p%d", dp->index) >= len)
 954                 return -EINVAL;
 955
 956         return 0;
 957 }
 958
 959 static struct dsa_mall_tc_entry *
 960 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 961 {
 962         struct dsa_slave_priv *p = netdev_priv(dev);
 963         struct dsa_mall_tc_entry *mall_tc_entry;
 964
 965         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 966                 if (mall_tc_entry->cookie == cookie)
 967                         return mall_tc_entry;
 968
 969         return NULL;
 970 }
 971
 972 static int
 973 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 974                                   struct tc_cls_matchall_offload *cls,
 975                                   bool ingress)
 976 {
 977         struct dsa_port *dp = dsa_slave_to_port(dev);
 978         struct dsa_slave_priv *p = netdev_priv(dev);
 979         struct dsa_mall_mirror_tc_entry *mirror;
 980         struct dsa_mall_tc_entry *mall_tc_entry;
 981         struct dsa_switch *ds = dp->ds;
 982         struct flow_action_entry *act;
 983         struct dsa_port *to_dp;
 984         int err;
 985
 986         if (!ds->ops->port_mirror_add)
 987                 return -EOPNOTSUPP;
 988
 989         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 990                                               cls->common.extack))
 991                 return -EOPNOTSUPP;
 992
 993         act = &cls->rule->action.entries[0];
 994
 995         if (!act->dev)
 996                 return -EINVAL;
 997
 998         if (!dsa_slave_dev_check(act->dev))
 999                 return -EOPNOTSUPP;
1000
1001         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1002         if (!mall_tc_entry)
1003                 return -ENOMEM;
1004
1005         mall_tc_entry->cookie = cls->cookie;
1006         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1007         mirror = &mall_tc_entry->mirror;
1008
1009         to_dp = dsa_slave_to_port(act->dev);
1010
1011         mirror->to_local_port = to_dp->index;
1012         mirror->ingress = ingress;
1013
1014         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
1015         if (err) {
1016                 kfree(mall_tc_entry);
1017                 return err;
1018         }
1019
1020         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1021
1022         return err;
1023 }
1024
1025 static int
1026 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1027                                   struct tc_cls_matchall_offload *cls,
1028                                   bool ingress)
1029 {
1030         struct netlink_ext_ack *extack = cls->common.extack;
1031         struct dsa_port *dp = dsa_slave_to_port(dev);
1032         struct dsa_slave_priv *p = netdev_priv(dev);
1033         struct dsa_mall_policer_tc_entry *policer;
1034         struct dsa_mall_tc_entry *mall_tc_entry;
1035         struct dsa_switch *ds = dp->ds;
1036         struct flow_action_entry *act;
1037         int err;
1038
1039         if (!ds->ops->port_policer_add) {
1040                 NL_SET_ERR_MSG_MOD(extack,
1041                                    "Policing offload not implemented");
1042                 return -EOPNOTSUPP;
1043         }
1044
1045         if (!ingress) {
1046                 NL_SET_ERR_MSG_MOD(extack,
1047                                    "Only supported on ingress qdisc");
1048                 return -EOPNOTSUPP;
1049         }
1050
1051         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1052                                               cls->common.extack))
1053                 return -EOPNOTSUPP;
1054
1055         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1056                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1057                         NL_SET_ERR_MSG_MOD(extack,
1058                                            "Only one port policer allowed");
1059                         return -EEXIST;
1060                 }
1061         }
1062
1063         act = &cls->rule->action.entries[0];
1064
1065         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1066         if (!mall_tc_entry)
1067                 return -ENOMEM;
1068
1069         mall_tc_entry->cookie = cls->cookie;
1070         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1071         policer = &mall_tc_entry->policer;
1072         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1073         policer->burst = act->police.burst;
1074
1075         err = ds->ops->port_policer_add(ds, dp->index, policer);
1076         if (err) {
1077                 kfree(mall_tc_entry);
1078                 return err;
1079         }
1080
1081         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1082
1083         return err;
1084 }
1085
1086 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1087                                       struct tc_cls_matchall_offload *cls,
1088                                       bool ingress)
1089 {
1090         int err = -EOPNOTSUPP;
1091
1092         if (cls->common.protocol == htons(ETH_P_ALL) &&
1093             flow_offload_has_one_action(&cls->rule->action) &&
1094             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1095                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1096         else if (flow_offload_has_one_action(&cls->rule->action) &&
1097                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1098                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1099
1100         return err;
1101 }
1102
1103 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1104                                        struct tc_cls_matchall_offload *cls)
1105 {
1106         struct dsa_port *dp = dsa_slave_to_port(dev);
1107         struct dsa_mall_tc_entry *mall_tc_entry;
1108         struct dsa_switch *ds = dp->ds;
1109
1110         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1111         if (!mall_tc_entry)
1112                 return;
1113
1114         list_del(&mall_tc_entry->list);
1115
1116         switch (mall_tc_entry->type) {
1117         case DSA_PORT_MALL_MIRROR:
1118                 if (ds->ops->port_mirror_del)
1119                         ds->ops->port_mirror_del(ds, dp->index,
1120                                                  &mall_tc_entry->mirror);
1121                 break;
1122         case DSA_PORT_MALL_POLICER:
1123                 if (ds->ops->port_policer_del)
1124                         ds->ops->port_policer_del(ds, dp->index);
1125                 break;
1126         default:
1127                 WARN_ON(1);
1128         }
1129
1130         kfree(mall_tc_entry);
1131 }
1132
1133 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1134                                            struct tc_cls_matchall_offload *cls,
1135                                            bool ingress)
1136 {
1137         if (cls->common.chain_index)
1138                 return -EOPNOTSUPP;
1139
1140         switch (cls->command) {
1141         case TC_CLSMATCHALL_REPLACE:
1142                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1143         case TC_CLSMATCHALL_DESTROY:
1144                 dsa_slave_del_cls_matchall(dev, cls);
1145                 return 0;
1146         default:
1147                 return -EOPNOTSUPP;
1148         }
1149 }
1150
1151 static int dsa_slave_add_cls_flower(struct net_device *dev,
1152                                     struct flow_cls_offload *cls,
1153                                     bool ingress)
1154 {
1155         struct dsa_port *dp = dsa_slave_to_port(dev);
1156         struct dsa_switch *ds = dp->ds;
1157         int port = dp->index;
1158
1159         if (!ds->ops->cls_flower_add)
1160                 return -EOPNOTSUPP;
1161
1162         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1163 }
1164
1165 static int dsa_slave_del_cls_flower(struct net_device *dev,
1166                                     struct flow_cls_offload *cls,
1167                                     bool ingress)
1168 {
1169         struct dsa_port *dp = dsa_slave_to_port(dev);
1170         struct dsa_switch *ds = dp->ds;
1171         int port = dp->index;
1172
1173         if (!ds->ops->cls_flower_del)
1174                 return -EOPNOTSUPP;
1175
1176         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1177 }
1178
1179 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1180                                       struct flow_cls_offload *cls,
1181                                       bool ingress)
1182 {
1183         struct dsa_port *dp = dsa_slave_to_port(dev);
1184         struct dsa_switch *ds = dp->ds;
1185         int port = dp->index;
1186
1187         if (!ds->ops->cls_flower_stats)
1188                 return -EOPNOTSUPP;
1189
1190         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1191 }
1192
1193 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1194                                          struct flow_cls_offload *cls,
1195                                          bool ingress)
1196 {
1197         switch (cls->command) {
1198         case FLOW_CLS_REPLACE:
1199                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1200         case FLOW_CLS_DESTROY:
1201                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1202         case FLOW_CLS_STATS:
1203                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1204         default:
1205                 return -EOPNOTSUPP;
1206         }
1207 }
1208
1209 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1210                                        void *cb_priv, bool ingress)
1211 {
1212         struct net_device *dev = cb_priv;
1213
1214         if (!tc_can_offload(dev))
1215                 return -EOPNOTSUPP;
1216
1217         switch (type) {
1218         case TC_SETUP_CLSMATCHALL:
1219                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1220         case TC_SETUP_CLSFLOWER:
1221                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1222         default:
1223                 return -EOPNOTSUPP;
1224         }
1225 }
1226
1227 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1228                                           void *type_data, void *cb_priv)
1229 {
1230         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1231 }
1232
1233 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1234                                           void *type_data, void *cb_priv)
1235 {
1236         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1237 }
1238
1239 static LIST_HEAD(dsa_slave_block_cb_list);
1240
1241 static int dsa_slave_setup_tc_block(struct net_device *dev,
1242                                     struct flow_block_offload *f)
1243 {
1244         struct flow_block_cb *block_cb;
1245         flow_setup_cb_t *cb;
1246
1247         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1248                 cb = dsa_slave_setup_tc_block_cb_ig;
1249         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1250                 cb = dsa_slave_setup_tc_block_cb_eg;
1251         else
1252                 return -EOPNOTSUPP;
1253
1254         f->driver_block_list = &dsa_slave_block_cb_list;
1255
1256         switch (f->command) {
1257         case FLOW_BLOCK_BIND:
1258                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1259                         return -EBUSY;
1260
1261                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1262                 if (IS_ERR(block_cb))
1263                         return PTR_ERR(block_cb);
1264
1265                 flow_block_cb_add(block_cb, f);
1266                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1267                 return 0;
1268         case FLOW_BLOCK_UNBIND:
1269                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1270                 if (!block_cb)
1271                         return -ENOENT;
1272
1273                 flow_block_cb_remove(block_cb, f);
1274                 list_del(&block_cb->driver_list);
1275                 return 0;
1276         default:
1277                 return -EOPNOTSUPP;
1278         }
1279 }
1280
1281 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1282                               void *type_data)
1283 {
1284         struct dsa_port *dp = dsa_slave_to_port(dev);
1285         struct dsa_switch *ds = dp->ds;
1286
1287         if (type == TC_SETUP_BLOCK)
1288                 return dsa_slave_setup_tc_block(dev, type_data);
1289
1290         if (!ds->ops->port_setup_tc)
1291                 return -EOPNOTSUPP;
1292
1293         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1294 }
1295
1296 static int dsa_slave_get_rxnfc(struct net_device *dev,
1297                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1298 {
1299         struct dsa_port *dp = dsa_slave_to_port(dev);
1300         struct dsa_switch *ds = dp->ds;
1301
1302         if (!ds->ops->get_rxnfc)
1303                 return -EOPNOTSUPP;
1304
1305         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1306 }
1307
1308 static int dsa_slave_set_rxnfc(struct net_device *dev,
1309                                struct ethtool_rxnfc *nfc)
1310 {
1311         struct dsa_port *dp = dsa_slave_to_port(dev);
1312         struct dsa_switch *ds = dp->ds;
1313
1314         if (!ds->ops->set_rxnfc)
1315                 return -EOPNOTSUPP;
1316
1317         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1318 }
1319
1320 static int dsa_slave_get_ts_info(struct net_device *dev,
1321                                  struct ethtool_ts_info *ts)
1322 {
1323         struct dsa_slave_priv *p = netdev_priv(dev);
1324         struct dsa_switch *ds = p->dp->ds;
1325
1326         if (!ds->ops->get_ts_info)
1327                 return -EOPNOTSUPP;
1328
1329         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1330 }
1331
1332 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1333                                      u16 vid)
1334 {
1335         struct net_device *master = dsa_slave_to_master(dev);
1336         struct dsa_port *dp = dsa_slave_to_port(dev);
1337         struct switchdev_obj_port_vlan vlan = {
1338                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1339                 .vid = vid,
1340                 /* This API only allows programming tagged, non-PVID VIDs */
1341                 .flags = 0,
1342         };
1343         struct netlink_ext_ack extack = {0};
1344         int ret;
1345
1346         /* User port... */
1347         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1348         if (ret) {
1349                 if (extack._msg)
1350                         netdev_err(dev, "%s\n", extack._msg);
1351                 return ret;
1352         }
1353
1354         /* And CPU port... */
1355         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &extack);
1356         if (ret) {
1357                 if (extack._msg)
1358                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1359                                    extack._msg);
1360                 return ret;
1361         }
1362
1363         return vlan_vid_add(master, proto, vid);
1364 }
1365
1366 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1367                                       u16 vid)
1368 {
1369         struct net_device *master = dsa_slave_to_master(dev);
1370         struct dsa_port *dp = dsa_slave_to_port(dev);
1371         struct switchdev_obj_port_vlan vlan = {
1372                 .vid = vid,
1373                 /* This API only allows programming tagged, non-PVID VIDs */
1374                 .flags = 0,
1375         };
1376         int err;
1377
1378         /* Do not deprogram the CPU port as it may be shared with other user
1379          * ports which can be members of this VLAN as well.
1380          */
1381         err = dsa_port_vlan_del(dp, &vlan);
1382         if (err)
1383                 return err;
1384
1385         vlan_vid_del(master, proto, vid);
1386
1387         return 0;
1388 }
1389
1390 struct dsa_hw_port {
1391         struct list_head list;
1392         struct net_device *dev;
1393         int old_mtu;
1394 };
1395
1396 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1397 {
1398         const struct dsa_hw_port *p;
1399         int err;
1400
1401         list_for_each_entry(p, hw_port_list, list) {
1402                 if (p->dev->mtu == mtu)
1403                         continue;
1404
1405                 err = dev_set_mtu(p->dev, mtu);
1406                 if (err)
1407                         goto rollback;
1408         }
1409
1410         return 0;
1411
1412 rollback:
1413         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1414                 if (p->dev->mtu == p->old_mtu)
1415                         continue;
1416
1417                 if (dev_set_mtu(p->dev, p->old_mtu))
1418                         netdev_err(p->dev, "Failed to restore MTU\n");
1419         }
1420
1421         return err;
1422 }
1423
1424 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1425 {
1426         struct dsa_hw_port *p, *n;
1427
1428         list_for_each_entry_safe(p, n, hw_port_list, list)
1429                 kfree(p);
1430 }
1431
1432 /* Make the hardware datapath to/from @dev limited to a common MTU */
1433 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1434 {
1435         struct list_head hw_port_list;
1436         struct dsa_switch_tree *dst;
1437         int min_mtu = ETH_MAX_MTU;
1438         struct dsa_port *other_dp;
1439         int err;
1440
1441         if (!dp->ds->mtu_enforcement_ingress)
1442                 return;
1443
1444         if (!dp->bridge_dev)
1445                 return;
1446
1447         INIT_LIST_HEAD(&hw_port_list);
1448
1449         /* Populate the list of ports that are part of the same bridge
1450          * as the newly added/modified port
1451          */
1452         list_for_each_entry(dst, &dsa_tree_list, list) {
1453                 list_for_each_entry(other_dp, &dst->ports, list) {
1454                         struct dsa_hw_port *hw_port;
1455                         struct net_device *slave;
1456
1457                         if (other_dp->type != DSA_PORT_TYPE_USER)
1458                                 continue;
1459
1460                         if (other_dp->bridge_dev != dp->bridge_dev)
1461                                 continue;
1462
1463                         if (!other_dp->ds->mtu_enforcement_ingress)
1464                                 continue;
1465
1466                         slave = other_dp->slave;
1467
1468                         if (min_mtu > slave->mtu)
1469                                 min_mtu = slave->mtu;
1470
1471                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1472                         if (!hw_port)
1473                                 goto out;
1474
1475                         hw_port->dev = slave;
1476                         hw_port->old_mtu = slave->mtu;
1477
1478                         list_add(&hw_port->list, &hw_port_list);
1479                 }
1480         }
1481
1482         /* Attempt to configure the entire hardware bridge to the newly added
1483          * interface's MTU first, regardless of whether the intention of the
1484          * user was to raise or lower it.
1485          */
1486         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1487         if (!err)
1488                 goto out;
1489
1490         /* Clearly that didn't work out so well, so just set the minimum MTU on
1491          * all hardware bridge ports now. If this fails too, then all ports will
1492          * still have their old MTU rolled back anyway.
1493          */
1494         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1495
1496 out:
1497         dsa_hw_port_list_free(&hw_port_list);
1498 }
1499
1500 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1501 {
1502         struct net_device *master = dsa_slave_to_master(dev);
1503         struct dsa_port *dp = dsa_slave_to_port(dev);
1504         struct dsa_slave_priv *p = netdev_priv(dev);
1505         struct dsa_switch *ds = p->dp->ds;
1506         struct dsa_port *cpu_dp;
1507         int port = p->dp->index;
1508         int largest_mtu = 0;
1509         int new_master_mtu;
1510         int old_master_mtu;
1511         int mtu_limit;
1512         int cpu_mtu;
1513         int err, i;
1514
1515         if (!ds->ops->port_change_mtu)
1516                 return -EOPNOTSUPP;
1517
1518         for (i = 0; i < ds->num_ports; i++) {
1519                 int slave_mtu;
1520
1521                 if (!dsa_is_user_port(ds, i))
1522                         continue;
1523
1524                 /* During probe, this function will be called for each slave
1525                  * device, while not all of them have been allocated. That's
1526                  * ok, it doesn't change what the maximum is, so ignore it.
1527                  */
1528                 if (!dsa_to_port(ds, i)->slave)
1529                         continue;
1530
1531                 /* Pretend that we already applied the setting, which we
1532                  * actually haven't (still haven't done all integrity checks)
1533                  */
1534                 if (i == port)
1535                         slave_mtu = new_mtu;
1536                 else
1537                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1538
1539                 if (largest_mtu < slave_mtu)
1540                         largest_mtu = slave_mtu;
1541         }
1542
1543         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1544
1545         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1546         old_master_mtu = master->mtu;
1547         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1548         if (new_master_mtu > mtu_limit)
1549                 return -ERANGE;
1550
1551         /* If the master MTU isn't over limit, there's no need to check the CPU
1552          * MTU, since that surely isn't either.
1553          */
1554         cpu_mtu = largest_mtu;
1555
1556         /* Start applying stuff */
1557         if (new_master_mtu != old_master_mtu) {
1558                 err = dev_set_mtu(master, new_master_mtu);
1559                 if (err < 0)
1560                         goto out_master_failed;
1561
1562                 /* We only need to propagate the MTU of the CPU port to
1563                  * upstream switches.
1564                  */
1565                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1566                 if (err)
1567                         goto out_cpu_failed;
1568         }
1569
1570         err = dsa_port_mtu_change(dp, new_mtu, false);
1571         if (err)
1572                 goto out_port_failed;
1573
1574         dev->mtu = new_mtu;
1575
1576         dsa_bridge_mtu_normalization(dp);
1577
1578         return 0;
1579
1580 out_port_failed:
1581         if (new_master_mtu != old_master_mtu)
1582                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1583                                     cpu_dp->tag_ops->overhead,
1584                                     true);
1585 out_cpu_failed:
1586         if (new_master_mtu != old_master_mtu)
1587                 dev_set_mtu(master, old_master_mtu);
1588 out_master_failed:
1589         return err;
1590 }
1591
1592 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1593         .get_drvinfo            = dsa_slave_get_drvinfo,
1594         .get_regs_len           = dsa_slave_get_regs_len,
1595         .get_regs               = dsa_slave_get_regs,
1596         .nway_reset             = dsa_slave_nway_reset,
1597         .get_link               = ethtool_op_get_link,
1598         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1599         .get_eeprom             = dsa_slave_get_eeprom,
1600         .set_eeprom             = dsa_slave_set_eeprom,
1601         .get_strings            = dsa_slave_get_strings,
1602         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1603         .get_sset_count         = dsa_slave_get_sset_count,
1604         .set_wol                = dsa_slave_set_wol,
1605         .get_wol                = dsa_slave_get_wol,
1606         .set_eee                = dsa_slave_set_eee,
1607         .get_eee                = dsa_slave_get_eee,
1608         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1609         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1610         .get_pauseparam         = dsa_slave_get_pauseparam,
1611         .set_pauseparam         = dsa_slave_set_pauseparam,
1612         .get_rxnfc              = dsa_slave_get_rxnfc,
1613         .set_rxnfc              = dsa_slave_set_rxnfc,
1614         .get_ts_info            = dsa_slave_get_ts_info,
1615 };
1616
1617 /* legacy way, bypassing the bridge *****************************************/
1618 static int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1619                               struct net_device *dev,
1620                               const unsigned char *addr, u16 vid,
1621                               u16 flags,
1622                               struct netlink_ext_ack *extack)
1623 {
1624         struct dsa_port *dp = dsa_slave_to_port(dev);
1625
1626         return dsa_port_fdb_add(dp, addr, vid);
1627 }
1628
1629 static int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1630                               struct net_device *dev,
1631                               const unsigned char *addr, u16 vid)
1632 {
1633         struct dsa_port *dp = dsa_slave_to_port(dev);
1634
1635         return dsa_port_fdb_del(dp, addr, vid);
1636 }
1637
1638 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1639 {
1640         struct dsa_port *dp = dsa_slave_to_port(dev);
1641
1642         return dp->ds->devlink ? &dp->devlink_port : NULL;
1643 }
1644
1645 static void dsa_slave_get_stats64(struct net_device *dev,
1646                                   struct rtnl_link_stats64 *s)
1647 {
1648         struct dsa_port *dp = dsa_slave_to_port(dev);
1649         struct dsa_switch *ds = dp->ds;
1650
1651         if (ds->ops->get_stats64)
1652                 ds->ops->get_stats64(ds, dp->index, s);
1653         else
1654                 dev_get_tstats64(dev, s);
1655 }
1656
1657 static const struct net_device_ops dsa_slave_netdev_ops = {
1658         .ndo_open               = dsa_slave_open,
1659         .ndo_stop               = dsa_slave_close,
1660         .ndo_start_xmit         = dsa_slave_xmit,
1661         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1662         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1663         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1664         .ndo_fdb_add            = dsa_legacy_fdb_add,
1665         .ndo_fdb_del            = dsa_legacy_fdb_del,
1666         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1667         .ndo_do_ioctl           = dsa_slave_ioctl,
1668         .ndo_get_iflink         = dsa_slave_get_iflink,
1669 #ifdef CONFIG_NET_POLL_CONTROLLER
1670         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1671         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1672         .ndo_poll_controller    = dsa_slave_poll_controller,
1673 #endif
1674         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1675         .ndo_setup_tc           = dsa_slave_setup_tc,
1676         .ndo_get_stats64        = dsa_slave_get_stats64,
1677         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1678         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1679         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1680         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1681         .ndo_change_mtu         = dsa_slave_change_mtu,
1682 };
1683
1684 static struct device_type dsa_type = {
1685         .name   = "dsa",
1686 };
1687
1688 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1689 {
1690         const struct dsa_port *dp = dsa_to_port(ds, port);
1691
1692         if (dp->pl)
1693                 phylink_mac_change(dp->pl, up);
1694 }
1695 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1696
1697 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1698                                           struct phylink_link_state *state)
1699 {
1700         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1701         struct dsa_switch *ds = dp->ds;
1702
1703         /* No need to check that this operation is valid, the callback would
1704          * not be called if it was not.
1705          */
1706         ds->ops->phylink_fixed_state(ds, dp->index, state);
1707 }
1708
1709 /* slave device setup *******************************************************/
1710 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1711 {
1712         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1713         struct dsa_switch *ds = dp->ds;
1714
1715         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1716         if (!slave_dev->phydev) {
1717                 netdev_err(slave_dev, "no phy at %d\n", addr);
1718                 return -ENODEV;
1719         }
1720
1721         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1722 }
1723
1724 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1725 {
1726         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1727         struct device_node *port_dn = dp->dn;
1728         struct dsa_switch *ds = dp->ds;
1729         phy_interface_t mode;
1730         u32 phy_flags = 0;
1731         int ret;
1732
1733         ret = of_get_phy_mode(port_dn, &mode);
1734         if (ret)
1735                 mode = PHY_INTERFACE_MODE_NA;
1736
1737         dp->pl_config.dev = &slave_dev->dev;
1738         dp->pl_config.type = PHYLINK_NETDEV;
1739
1740         /* The get_fixed_state callback takes precedence over polling the
1741          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1742          * this if the switch provides such a callback.
1743          */
1744         if (ds->ops->phylink_fixed_state) {
1745                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1746                 dp->pl_config.poll_fixed_state = true;
1747         }
1748
1749         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1750                                 &dsa_port_phylink_mac_ops);
1751         if (IS_ERR(dp->pl)) {
1752                 netdev_err(slave_dev,
1753                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1754                 return PTR_ERR(dp->pl);
1755         }
1756
1757         if (ds->ops->get_phy_flags)
1758                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1759
1760         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1761         if (ret == -ENODEV && ds->slave_mii_bus) {
1762                 /* We could not connect to a designated PHY or SFP, so try to
1763                  * use the switch internal MDIO bus instead
1764                  */
1765                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1766                 if (ret) {
1767                         netdev_err(slave_dev,
1768                                    "failed to connect to port %d: %d\n",
1769                                    dp->index, ret);
1770                         phylink_destroy(dp->pl);
1771                         return ret;
1772                 }
1773         }
1774
1775         return ret;
1776 }
1777
1778 void dsa_slave_setup_tagger(struct net_device *slave)
1779 {
1780         struct dsa_port *dp = dsa_slave_to_port(slave);
1781         struct dsa_slave_priv *p = netdev_priv(slave);
1782         const struct dsa_port *cpu_dp = dp->cpu_dp;
1783         struct net_device *master = cpu_dp->master;
1784
1785         if (cpu_dp->tag_ops->tail_tag)
1786                 slave->needed_tailroom = cpu_dp->tag_ops->overhead;
1787         else
1788                 slave->needed_headroom = cpu_dp->tag_ops->overhead;
1789         /* Try to save one extra realloc later in the TX path (in the master)
1790          * by also inheriting the master's needed headroom and tailroom.
1791          * The 8021q driver also does this.
1792          */
1793         slave->needed_headroom += master->needed_headroom;
1794         slave->needed_tailroom += master->needed_tailroom;
1795
1796         p->xmit = cpu_dp->tag_ops->xmit;
1797 }
1798
1799 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1800 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1801                                             struct netdev_queue *txq,
1802                                             void *_unused)
1803 {
1804         lockdep_set_class(&txq->_xmit_lock,
1805                           &dsa_slave_netdev_xmit_lock_key);
1806 }
1807
1808 int dsa_slave_suspend(struct net_device *slave_dev)
1809 {
1810         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1811
1812         if (!netif_running(slave_dev))
1813                 return 0;
1814
1815         netif_device_detach(slave_dev);
1816
1817         rtnl_lock();
1818         phylink_stop(dp->pl);
1819         rtnl_unlock();
1820
1821         return 0;
1822 }
1823
1824 int dsa_slave_resume(struct net_device *slave_dev)
1825 {
1826         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1827
1828         if (!netif_running(slave_dev))
1829                 return 0;
1830
1831         netif_device_attach(slave_dev);
1832
1833         rtnl_lock();
1834         phylink_start(dp->pl);
1835         rtnl_unlock();
1836
1837         return 0;
1838 }
1839
1840 int dsa_slave_create(struct dsa_port *port)
1841 {
1842         const struct dsa_port *cpu_dp = port->cpu_dp;
1843         struct net_device *master = cpu_dp->master;
1844         struct dsa_switch *ds = port->ds;
1845         const char *name = port->name;
1846         struct net_device *slave_dev;
1847         struct dsa_slave_priv *p;
1848         int ret;
1849
1850         if (!ds->num_tx_queues)
1851                 ds->num_tx_queues = 1;
1852
1853         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1854                                      NET_NAME_UNKNOWN, ether_setup,
1855                                      ds->num_tx_queues, 1);
1856         if (slave_dev == NULL)
1857                 return -ENOMEM;
1858
1859         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1860         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1861                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1862         slave_dev->hw_features |= NETIF_F_HW_TC;
1863         slave_dev->features |= NETIF_F_LLTX;
1864         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1865         if (!IS_ERR_OR_NULL(port->mac))
1866                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1867         else
1868                 eth_hw_addr_inherit(slave_dev, master);
1869         slave_dev->priv_flags |= IFF_NO_QUEUE;
1870         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1871         if (ds->ops->port_max_mtu)
1872                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1873         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1874
1875         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1876                                  NULL);
1877
1878         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1879         slave_dev->dev.of_node = port->dn;
1880         slave_dev->vlan_features = master->vlan_features;
1881
1882         p = netdev_priv(slave_dev);
1883         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1884         if (!slave_dev->tstats) {
1885                 free_netdev(slave_dev);
1886                 return -ENOMEM;
1887         }
1888
1889         ret = gro_cells_init(&p->gcells, slave_dev);
1890         if (ret)
1891                 goto out_free;
1892
1893         p->dp = port;
1894         INIT_LIST_HEAD(&p->mall_tc_list);
1895         port->slave = slave_dev;
1896         dsa_slave_setup_tagger(slave_dev);
1897
1898         rtnl_lock();
1899         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1900         rtnl_unlock();
1901         if (ret && ret != -EOPNOTSUPP)
1902                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1903                          ret, ETH_DATA_LEN, port->index);
1904
1905         netif_carrier_off(slave_dev);
1906
1907         ret = dsa_slave_phy_setup(slave_dev);
1908         if (ret) {
1909                 netdev_err(slave_dev,
1910                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1911                            ret, ds->dst->index, ds->index, port->index);
1912                 goto out_gcells;
1913         }
1914
1915         rtnl_lock();
1916
1917         ret = register_netdevice(slave_dev);
1918         if (ret) {
1919                 netdev_err(master, "error %d registering interface %s\n",
1920                            ret, slave_dev->name);
1921                 rtnl_unlock();
1922                 goto out_phy;
1923         }
1924
1925         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1926
1927         rtnl_unlock();
1928
1929         if (ret)
1930                 goto out_unregister;
1931
1932         return 0;
1933
1934 out_unregister:
1935         unregister_netdev(slave_dev);
1936 out_phy:
1937         rtnl_lock();
1938         phylink_disconnect_phy(p->dp->pl);
1939         rtnl_unlock();
1940         phylink_destroy(p->dp->pl);
1941 out_gcells:
1942         gro_cells_destroy(&p->gcells);
1943 out_free:
1944         free_percpu(slave_dev->tstats);
1945         free_netdev(slave_dev);
1946         port->slave = NULL;
1947         return ret;
1948 }
1949
1950 void dsa_slave_destroy(struct net_device *slave_dev)
1951 {
1952         struct net_device *master = dsa_slave_to_master(slave_dev);
1953         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1954         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1955
1956         netif_carrier_off(slave_dev);
1957         rtnl_lock();
1958         netdev_upper_dev_unlink(master, slave_dev);
1959         unregister_netdevice(slave_dev);
1960         phylink_disconnect_phy(dp->pl);
1961         rtnl_unlock();
1962
1963         phylink_destroy(dp->pl);
1964         gro_cells_destroy(&p->gcells);
1965         free_percpu(slave_dev->tstats);
1966         free_netdev(slave_dev);
1967 }
1968
1969 bool dsa_slave_dev_check(const struct net_device *dev)
1970 {
1971         return dev->netdev_ops == &dsa_slave_netdev_ops;
1972 }
1973 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
1974
1975 static int dsa_slave_changeupper(struct net_device *dev,
1976                                  struct netdev_notifier_changeupper_info *info)
1977 {
1978         struct dsa_port *dp = dsa_slave_to_port(dev);
1979         int err = NOTIFY_DONE;
1980
1981         if (netif_is_bridge_master(info->upper_dev)) {
1982                 if (info->linking) {
1983                         err = dsa_port_bridge_join(dp, info->upper_dev);
1984                         if (!err)
1985                                 dsa_bridge_mtu_normalization(dp);
1986                         err = notifier_from_errno(err);
1987                 } else {
1988                         dsa_port_bridge_leave(dp, info->upper_dev);
1989                         err = NOTIFY_OK;
1990                 }
1991         } else if (netif_is_lag_master(info->upper_dev)) {
1992                 if (info->linking) {
1993                         err = dsa_port_lag_join(dp, info->upper_dev,
1994                                                 info->upper_info);
1995                         if (err == -EOPNOTSUPP) {
1996                                 NL_SET_ERR_MSG_MOD(info->info.extack,
1997                                                    "Offloading not supported");
1998                                 err = 0;
1999                         }
2000                         err = notifier_from_errno(err);
2001                 } else {
2002                         dsa_port_lag_leave(dp, info->upper_dev);
2003                         err = NOTIFY_OK;
2004                 }
2005         } else if (is_hsr_master(info->upper_dev)) {
2006                 if (info->linking) {
2007                         err = dsa_port_hsr_join(dp, info->upper_dev);
2008                         if (err == -EOPNOTSUPP) {
2009                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2010                                                    "Offloading not supported");
2011                                 err = 0;
2012                         }
2013                         err = notifier_from_errno(err);
2014                 } else {
2015                         dsa_port_hsr_leave(dp, info->upper_dev);
2016                         err = NOTIFY_OK;
2017                 }
2018         }
2019
2020         return err;
2021 }
2022
2023 static int
2024 dsa_slave_lag_changeupper(struct net_device *dev,
2025                           struct netdev_notifier_changeupper_info *info)
2026 {
2027         struct net_device *lower;
2028         struct list_head *iter;
2029         int err = NOTIFY_DONE;
2030         struct dsa_port *dp;
2031
2032         netdev_for_each_lower_dev(dev, lower, iter) {
2033                 if (!dsa_slave_dev_check(lower))
2034                         continue;
2035
2036                 dp = dsa_slave_to_port(lower);
2037                 if (!dp->lag_dev)
2038                         /* Software LAG */
2039                         continue;
2040
2041                 err = dsa_slave_changeupper(lower, info);
2042                 if (notifier_to_errno(err))
2043                         break;
2044         }
2045
2046         return err;
2047 }
2048
2049 static int
2050 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2051                                  struct netdev_notifier_changeupper_info *info)
2052 {
2053         struct netlink_ext_ack *ext_ack;
2054         struct net_device *slave;
2055         struct dsa_port *dp;
2056
2057         ext_ack = netdev_notifier_info_to_extack(&info->info);
2058
2059         if (!is_vlan_dev(dev))
2060                 return NOTIFY_DONE;
2061
2062         slave = vlan_dev_real_dev(dev);
2063         if (!dsa_slave_dev_check(slave))
2064                 return NOTIFY_DONE;
2065
2066         dp = dsa_slave_to_port(slave);
2067         if (!dp->bridge_dev)
2068                 return NOTIFY_DONE;
2069
2070         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2071         if (br_vlan_enabled(dp->bridge_dev) &&
2072             netif_is_bridge_master(info->upper_dev) && info->linking) {
2073                 NL_SET_ERR_MSG_MOD(ext_ack,
2074                                    "Cannot enslave VLAN device into VLAN aware bridge");
2075                 return notifier_from_errno(-EINVAL);
2076         }
2077
2078         return NOTIFY_DONE;
2079 }
2080
2081 static int
2082 dsa_slave_check_8021q_upper(struct net_device *dev,
2083                             struct netdev_notifier_changeupper_info *info)
2084 {
2085         struct dsa_port *dp = dsa_slave_to_port(dev);
2086         struct net_device *br = dp->bridge_dev;
2087         struct bridge_vlan_info br_info;
2088         struct netlink_ext_ack *extack;
2089         int err = NOTIFY_DONE;
2090         u16 vid;
2091
2092         if (!br || !br_vlan_enabled(br))
2093                 return NOTIFY_DONE;
2094
2095         extack = netdev_notifier_info_to_extack(&info->info);
2096         vid = vlan_dev_vlan_id(info->upper_dev);
2097
2098         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2099          * device, respectively the VID is not found, returning
2100          * 0 means success, which is a failure for us here.
2101          */
2102         err = br_vlan_get_info(br, vid, &br_info);
2103         if (err == 0) {
2104                 NL_SET_ERR_MSG_MOD(extack,
2105                                    "This VLAN is already configured by the bridge");
2106                 return notifier_from_errno(-EBUSY);
2107         }
2108
2109         return NOTIFY_DONE;
2110 }
2111
2112 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2113                                      unsigned long event, void *ptr)
2114 {
2115         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2116
2117         switch (event) {
2118         case NETDEV_PRECHANGEUPPER: {
2119                 struct netdev_notifier_changeupper_info *info = ptr;
2120                 struct dsa_switch *ds;
2121                 struct dsa_port *dp;
2122                 int err;
2123
2124                 if (!dsa_slave_dev_check(dev))
2125                         return dsa_prevent_bridging_8021q_upper(dev, ptr);
2126
2127                 dp = dsa_slave_to_port(dev);
2128                 ds = dp->ds;
2129
2130                 if (ds->ops->port_prechangeupper) {
2131                         err = ds->ops->port_prechangeupper(ds, dp->index, info);
2132                         if (err)
2133                                 return notifier_from_errno(err);
2134                 }
2135
2136                 if (is_vlan_dev(info->upper_dev))
2137                         return dsa_slave_check_8021q_upper(dev, ptr);
2138                 break;
2139         }
2140         case NETDEV_CHANGEUPPER:
2141                 if (dsa_slave_dev_check(dev))
2142                         return dsa_slave_changeupper(dev, ptr);
2143
2144                 if (netif_is_lag_master(dev))
2145                         return dsa_slave_lag_changeupper(dev, ptr);
2146
2147                 break;
2148         case NETDEV_CHANGELOWERSTATE: {
2149                 struct netdev_notifier_changelowerstate_info *info = ptr;
2150                 struct dsa_port *dp;
2151                 int err;
2152
2153                 if (!dsa_slave_dev_check(dev))
2154                         break;
2155
2156                 dp = dsa_slave_to_port(dev);
2157
2158                 err = dsa_port_lag_change(dp, info->lower_state_info);
2159                 return notifier_from_errno(err);
2160         }
2161         case NETDEV_GOING_DOWN: {
2162                 struct dsa_port *dp, *cpu_dp;
2163                 struct dsa_switch_tree *dst;
2164                 LIST_HEAD(close_list);
2165
2166                 if (!netdev_uses_dsa(dev))
2167                         return NOTIFY_DONE;
2168
2169                 cpu_dp = dev->dsa_ptr;
2170                 dst = cpu_dp->ds->dst;
2171
2172                 list_for_each_entry(dp, &dst->ports, list) {
2173                         if (!dsa_is_user_port(dp->ds, dp->index))
2174                                 continue;
2175
2176                         list_add(&dp->slave->close_list, &close_list);
2177                 }
2178
2179                 dev_close_many(&close_list, true);
2180
2181                 return NOTIFY_OK;
2182         }
2183         default:
2184                 break;
2185         }
2186
2187         return NOTIFY_DONE;
2188 }
2189
2190 static void
2191 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2192 {
2193         struct dsa_switch *ds = switchdev_work->ds;
2194         struct switchdev_notifier_fdb_info info;
2195         struct dsa_port *dp;
2196
2197         if (!dsa_is_user_port(ds, switchdev_work->port))
2198                 return;
2199
2200         info.addr = switchdev_work->addr;
2201         info.vid = switchdev_work->vid;
2202         info.offloaded = true;
2203         dp = dsa_to_port(ds, switchdev_work->port);
2204         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2205                                  dp->slave, &info.info, NULL);
2206 }
2207
2208 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2209 {
2210         struct dsa_switchdev_event_work *switchdev_work =
2211                 container_of(work, struct dsa_switchdev_event_work, work);
2212         struct dsa_switch *ds = switchdev_work->ds;
2213         struct dsa_port *dp;
2214         int err;
2215
2216         dp = dsa_to_port(ds, switchdev_work->port);
2217
2218         rtnl_lock();
2219         switch (switchdev_work->event) {
2220         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2221                 err = dsa_port_fdb_add(dp, switchdev_work->addr,
2222                                        switchdev_work->vid);
2223                 if (err) {
2224                         dev_err(ds->dev,
2225                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2226                                 dp->index, switchdev_work->addr,
2227                                 switchdev_work->vid, err);
2228                         break;
2229                 }
2230                 dsa_fdb_offload_notify(switchdev_work);
2231                 break;
2232
2233         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2234                 err = dsa_port_fdb_del(dp, switchdev_work->addr,
2235                                        switchdev_work->vid);
2236                 if (err) {
2237                         dev_err(ds->dev,
2238                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2239                                 dp->index, switchdev_work->addr,
2240                                 switchdev_work->vid, err);
2241                 }
2242
2243                 break;
2244         }
2245         rtnl_unlock();
2246
2247         kfree(switchdev_work);
2248         if (dsa_is_user_port(ds, dp->index))
2249                 dev_put(dp->slave);
2250 }
2251
2252 static int dsa_lower_dev_walk(struct net_device *lower_dev,
2253                               struct netdev_nested_priv *priv)
2254 {
2255         if (dsa_slave_dev_check(lower_dev)) {
2256                 priv->data = (void *)netdev_priv(lower_dev);
2257                 return 1;
2258         }
2259
2260         return 0;
2261 }
2262
2263 static struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev)
2264 {
2265         struct netdev_nested_priv priv = {
2266                 .data = NULL,
2267         };
2268
2269         netdev_walk_all_lower_dev_rcu(dev, dsa_lower_dev_walk, &priv);
2270
2271         return (struct dsa_slave_priv *)priv.data;
2272 }
2273
2274 /* Called under rcu_read_lock() */
2275 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2276                                      unsigned long event, void *ptr)
2277 {
2278         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2279         const struct switchdev_notifier_fdb_info *fdb_info;
2280         struct dsa_switchdev_event_work *switchdev_work;
2281         struct dsa_port *dp;
2282         int err;
2283
2284         switch (event) {
2285         case SWITCHDEV_PORT_ATTR_SET:
2286                 err = switchdev_handle_port_attr_set(dev, ptr,
2287                                                      dsa_slave_dev_check,
2288                                                      dsa_slave_port_attr_set);
2289                 return notifier_from_errno(err);
2290         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2291         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2292                 fdb_info = ptr;
2293
2294                 if (dsa_slave_dev_check(dev)) {
2295                         if (!fdb_info->added_by_user)
2296                                 return NOTIFY_OK;
2297
2298                         dp = dsa_slave_to_port(dev);
2299                 } else {
2300                         /* Snoop addresses learnt on foreign interfaces
2301                          * bridged with us, for switches that don't
2302                          * automatically learn SA from CPU-injected traffic
2303                          */
2304                         struct net_device *br_dev;
2305                         struct dsa_slave_priv *p;
2306
2307                         br_dev = netdev_master_upper_dev_get_rcu(dev);
2308                         if (!br_dev)
2309                                 return NOTIFY_DONE;
2310
2311                         if (!netif_is_bridge_master(br_dev))
2312                                 return NOTIFY_DONE;
2313
2314                         p = dsa_slave_dev_lower_find(br_dev);
2315                         if (!p)
2316                                 return NOTIFY_DONE;
2317
2318                         dp = p->dp->cpu_dp;
2319
2320                         if (!dp->ds->assisted_learning_on_cpu_port)
2321                                 return NOTIFY_DONE;
2322
2323                         /* When the bridge learns an address on an offloaded
2324                          * LAG we don't want to send traffic to the CPU, the
2325                          * other ports bridged with the LAG should be able to
2326                          * autonomously forward towards it.
2327                          */
2328                         if (dsa_tree_offloads_bridge_port(dp->ds->dst, dev))
2329                                 return NOTIFY_DONE;
2330                 }
2331
2332                 if (!dp->ds->ops->port_fdb_add || !dp->ds->ops->port_fdb_del)
2333                         return NOTIFY_DONE;
2334
2335                 switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2336                 if (!switchdev_work)
2337                         return NOTIFY_BAD;
2338
2339                 INIT_WORK(&switchdev_work->work,
2340                           dsa_slave_switchdev_event_work);
2341                 switchdev_work->ds = dp->ds;
2342                 switchdev_work->port = dp->index;
2343                 switchdev_work->event = event;
2344
2345                 ether_addr_copy(switchdev_work->addr,
2346                                 fdb_info->addr);
2347                 switchdev_work->vid = fdb_info->vid;
2348
2349                 /* Hold a reference on the slave for dsa_fdb_offload_notify */
2350                 if (dsa_is_user_port(dp->ds, dp->index))
2351                         dev_hold(dev);
2352                 dsa_schedule_work(&switchdev_work->work);
2353                 break;
2354         default:
2355                 return NOTIFY_DONE;
2356         }
2357
2358         return NOTIFY_OK;
2359 }
2360
2361 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2362                                               unsigned long event, void *ptr)
2363 {
2364         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2365         int err;
2366
2367         switch (event) {
2368         case SWITCHDEV_PORT_OBJ_ADD:
2369                 err = switchdev_handle_port_obj_add(dev, ptr,
2370                                                     dsa_slave_dev_check,
2371                                                     dsa_slave_port_obj_add);
2372                 return notifier_from_errno(err);
2373         case SWITCHDEV_PORT_OBJ_DEL:
2374                 err = switchdev_handle_port_obj_del(dev, ptr,
2375                                                     dsa_slave_dev_check,
2376                                                     dsa_slave_port_obj_del);
2377                 return notifier_from_errno(err);
2378         case SWITCHDEV_PORT_ATTR_SET:
2379                 err = switchdev_handle_port_attr_set(dev, ptr,
2380                                                      dsa_slave_dev_check,
2381                                                      dsa_slave_port_attr_set);
2382                 return notifier_from_errno(err);
2383         }
2384
2385         return NOTIFY_DONE;
2386 }
2387
2388 static struct notifier_block dsa_slave_nb __read_mostly = {
2389         .notifier_call  = dsa_slave_netdevice_event,
2390 };
2391
2392 static struct notifier_block dsa_slave_switchdev_notifier = {
2393         .notifier_call = dsa_slave_switchdev_event,
2394 };
2395
2396 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2397         .notifier_call = dsa_slave_switchdev_blocking_event,
2398 };
2399
2400 int dsa_slave_register_notifier(void)
2401 {
2402         struct notifier_block *nb;
2403         int err;
2404
2405         err = register_netdevice_notifier(&dsa_slave_nb);
2406         if (err)
2407                 return err;
2408
2409         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2410         if (err)
2411                 goto err_switchdev_nb;
2412
2413         nb = &dsa_slave_switchdev_blocking_notifier;
2414         err = register_switchdev_blocking_notifier(nb);
2415         if (err)
2416                 goto err_switchdev_blocking_nb;
2417
2418         return 0;
2419
2420 err_switchdev_blocking_nb:
2421         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2422 err_switchdev_nb:
2423         unregister_netdevice_notifier(&dsa_slave_nb);
2424         return err;
2425 }
2426
2427 void dsa_slave_unregister_notifier(void)
2428 {
2429         struct notifier_block *nb;
2430         int err;
2431
2432         nb = &dsa_slave_switchdev_blocking_notifier;
2433         err = unregister_switchdev_blocking_notifier(nb);
2434         if (err)
2435                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2436
2437         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2438         if (err)
2439                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2440
2441         err = unregister_netdevice_notifier(&dsa_slave_nb);
2442         if (err)
2443                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2444 }