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/selftests.h>
  19 #include <net/tc_act/tc_mirred.h>
  20 #include <linux/if_bridge.h>
  21 #include <linux/if_hsr.h>
  22 #include <linux/netpoll.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
 559         if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 560                 return;
 561
 562         if (!ds->ops->port_txtstamp)
 563                 return;
 564
 565         ds->ops->port_txtstamp(ds, p->dp->index, skb);
 566 }
 567
 568 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 569 {
 570         /* SKB for netpoll still need to be mangled with the protocol-specific
 571          * tag to be successfully transmitted
 572          */
 573         if (unlikely(netpoll_tx_running(dev)))
 574                 return dsa_slave_netpoll_send_skb(dev, skb);
 575
 576         /* Queue the SKB for transmission on the parent interface, but
 577          * do not modify its EtherType
 578          */
 579         skb->dev = dsa_slave_to_master(dev);
 580         dev_queue_xmit(skb);
 581
 582         return NETDEV_TX_OK;
 583 }
 584 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 585
 586 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 587 {
 588         int needed_headroom = dev->needed_headroom;
 589         int needed_tailroom = dev->needed_tailroom;
 590
 591         /* For tail taggers, we need to pad short frames ourselves, to ensure
 592          * that the tail tag does not fail at its role of being at the end of
 593          * the packet, once the master interface pads the frame. Account for
 594          * that pad length here, and pad later.
 595          */
 596         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 597                 needed_tailroom += ETH_ZLEN - skb->len;
 598         /* skb_headroom() returns unsigned int... */
 599         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 600         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 601
 602         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 603                 /* No reallocation needed, yay! */
 604                 return 0;
 605
 606         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 607                                 GFP_ATOMIC);
 608 }
 609
 610 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 611 {
 612         struct dsa_slave_priv *p = netdev_priv(dev);
 613         struct sk_buff *nskb;
 614
 615         dev_sw_netstats_tx_add(dev, 1, skb->len);
 616
 617         memset(skb->cb, 0, sizeof(skb->cb));
 618
 619         /* Handle tx timestamp if any */
 620         dsa_skb_tx_timestamp(p, skb);
 621
 622         if (dsa_realloc_skb(skb, dev)) {
 623                 dev_kfree_skb_any(skb);
 624                 return NETDEV_TX_OK;
 625         }
 626
 627         /* needed_tailroom should still be 'warm' in the cache line from
 628          * dsa_realloc_skb(), which has also ensured that padding is safe.
 629          */
 630         if (dev->needed_tailroom)
 631                 eth_skb_pad(skb);
 632
 633         /* Transmit function may have to reallocate the original SKB,
 634          * in which case it must have freed it. Only free it here on error.
 635          */
 636         nskb = p->xmit(skb, dev);
 637         if (!nskb) {
 638                 kfree_skb(skb);
 639                 return NETDEV_TX_OK;
 640         }
 641
 642         return dsa_enqueue_skb(nskb, dev);
 643 }
 644
 645 /* ethtool operations *******************************************************/
 646
 647 static void dsa_slave_get_drvinfo(struct net_device *dev,
 648                                   struct ethtool_drvinfo *drvinfo)
 649 {
 650         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 651         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 652         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 653 }
 654
 655 static int dsa_slave_get_regs_len(struct net_device *dev)
 656 {
 657         struct dsa_port *dp = dsa_slave_to_port(dev);
 658         struct dsa_switch *ds = dp->ds;
 659
 660         if (ds->ops->get_regs_len)
 661                 return ds->ops->get_regs_len(ds, dp->index);
 662
 663         return -EOPNOTSUPP;
 664 }
 665
 666 static void
 667 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 668 {
 669         struct dsa_port *dp = dsa_slave_to_port(dev);
 670         struct dsa_switch *ds = dp->ds;
 671
 672         if (ds->ops->get_regs)
 673                 ds->ops->get_regs(ds, dp->index, regs, _p);
 674 }
 675
 676 static int dsa_slave_nway_reset(struct net_device *dev)
 677 {
 678         struct dsa_port *dp = dsa_slave_to_port(dev);
 679
 680         return phylink_ethtool_nway_reset(dp->pl);
 681 }
 682
 683 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 684 {
 685         struct dsa_port *dp = dsa_slave_to_port(dev);
 686         struct dsa_switch *ds = dp->ds;
 687
 688         if (ds->cd && ds->cd->eeprom_len)
 689                 return ds->cd->eeprom_len;
 690
 691         if (ds->ops->get_eeprom_len)
 692                 return ds->ops->get_eeprom_len(ds);
 693
 694         return 0;
 695 }
 696
 697 static int dsa_slave_get_eeprom(struct net_device *dev,
 698                                 struct ethtool_eeprom *eeprom, u8 *data)
 699 {
 700         struct dsa_port *dp = dsa_slave_to_port(dev);
 701         struct dsa_switch *ds = dp->ds;
 702
 703         if (ds->ops->get_eeprom)
 704                 return ds->ops->get_eeprom(ds, eeprom, data);
 705
 706         return -EOPNOTSUPP;
 707 }
 708
 709 static int dsa_slave_set_eeprom(struct net_device *dev,
 710                                 struct ethtool_eeprom *eeprom, u8 *data)
 711 {
 712         struct dsa_port *dp = dsa_slave_to_port(dev);
 713         struct dsa_switch *ds = dp->ds;
 714
 715         if (ds->ops->set_eeprom)
 716                 return ds->ops->set_eeprom(ds, eeprom, data);
 717
 718         return -EOPNOTSUPP;
 719 }
 720
 721 static void dsa_slave_get_strings(struct net_device *dev,
 722                                   uint32_t stringset, uint8_t *data)
 723 {
 724         struct dsa_port *dp = dsa_slave_to_port(dev);
 725         struct dsa_switch *ds = dp->ds;
 726
 727         if (stringset == ETH_SS_STATS) {
 728                 int len = ETH_GSTRING_LEN;
 729
 730                 strncpy(data, "tx_packets", len);
 731                 strncpy(data + len, "tx_bytes", len);
 732                 strncpy(data + 2 * len, "rx_packets", len);
 733                 strncpy(data + 3 * len, "rx_bytes", len);
 734                 if (ds->ops->get_strings)
 735                         ds->ops->get_strings(ds, dp->index, stringset,
 736                                              data + 4 * len);
 737         } else if (stringset ==  ETH_SS_TEST) {
 738                 net_selftest_get_strings(data);
 739         }
 740
 741 }
 742
 743 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 744                                         struct ethtool_stats *stats,
 745                                         uint64_t *data)
 746 {
 747         struct dsa_port *dp = dsa_slave_to_port(dev);
 748         struct dsa_switch *ds = dp->ds;
 749         struct pcpu_sw_netstats *s;
 750         unsigned int start;
 751         int i;
 752
 753         for_each_possible_cpu(i) {
 754                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 755
 756                 s = per_cpu_ptr(dev->tstats, i);
 757                 do {
 758                         start = u64_stats_fetch_begin_irq(&s->syncp);
 759                         tx_packets = s->tx_packets;
 760                         tx_bytes = s->tx_bytes;
 761                         rx_packets = s->rx_packets;
 762                         rx_bytes = s->rx_bytes;
 763                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 764                 data[0] += tx_packets;
 765                 data[1] += tx_bytes;
 766                 data[2] += rx_packets;
 767                 data[3] += rx_bytes;
 768         }
 769         if (ds->ops->get_ethtool_stats)
 770                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 771 }
 772
 773 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 774 {
 775         struct dsa_port *dp = dsa_slave_to_port(dev);
 776         struct dsa_switch *ds = dp->ds;
 777
 778         if (sset == ETH_SS_STATS) {
 779                 int count;
 780
 781                 count = 4;
 782                 if (ds->ops->get_sset_count)
 783                         count += ds->ops->get_sset_count(ds, dp->index, sset);
 784
 785                 return count;
 786         } else if (sset ==  ETH_SS_TEST) {
 787                 return net_selftest_get_count();
 788         }
 789
 790         return -EOPNOTSUPP;
 791 }
 792
 793 static void dsa_slave_net_selftest(struct net_device *ndev,
 794                                    struct ethtool_test *etest, u64 *buf)
 795 {
 796         struct dsa_port *dp = dsa_slave_to_port(ndev);
 797         struct dsa_switch *ds = dp->ds;
 798
 799         if (ds->ops->self_test) {
 800                 ds->ops->self_test(ds, dp->index, etest, buf);
 801                 return;
 802         }
 803
 804         net_selftest(ndev, etest, buf);
 805 }
 806
 807 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 808 {
 809         struct dsa_port *dp = dsa_slave_to_port(dev);
 810         struct dsa_switch *ds = dp->ds;
 811
 812         phylink_ethtool_get_wol(dp->pl, w);
 813
 814         if (ds->ops->get_wol)
 815                 ds->ops->get_wol(ds, dp->index, w);
 816 }
 817
 818 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 819 {
 820         struct dsa_port *dp = dsa_slave_to_port(dev);
 821         struct dsa_switch *ds = dp->ds;
 822         int ret = -EOPNOTSUPP;
 823
 824         phylink_ethtool_set_wol(dp->pl, w);
 825
 826         if (ds->ops->set_wol)
 827                 ret = ds->ops->set_wol(ds, dp->index, w);
 828
 829         return ret;
 830 }
 831
 832 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 833 {
 834         struct dsa_port *dp = dsa_slave_to_port(dev);
 835         struct dsa_switch *ds = dp->ds;
 836         int ret;
 837
 838         /* Port's PHY and MAC both need to be EEE capable */
 839         if (!dev->phydev || !dp->pl)
 840                 return -ENODEV;
 841
 842         if (!ds->ops->set_mac_eee)
 843                 return -EOPNOTSUPP;
 844
 845         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 846         if (ret)
 847                 return ret;
 848
 849         return phylink_ethtool_set_eee(dp->pl, e);
 850 }
 851
 852 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 853 {
 854         struct dsa_port *dp = dsa_slave_to_port(dev);
 855         struct dsa_switch *ds = dp->ds;
 856         int ret;
 857
 858         /* Port's PHY and MAC both need to be EEE capable */
 859         if (!dev->phydev || !dp->pl)
 860                 return -ENODEV;
 861
 862         if (!ds->ops->get_mac_eee)
 863                 return -EOPNOTSUPP;
 864
 865         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 866         if (ret)
 867                 return ret;
 868
 869         return phylink_ethtool_get_eee(dp->pl, e);
 870 }
 871
 872 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 873                                         struct ethtool_link_ksettings *cmd)
 874 {
 875         struct dsa_port *dp = dsa_slave_to_port(dev);
 876
 877         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 878 }
 879
 880 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 881                                         const struct ethtool_link_ksettings *cmd)
 882 {
 883         struct dsa_port *dp = dsa_slave_to_port(dev);
 884
 885         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 886 }
 887
 888 static void dsa_slave_get_pauseparam(struct net_device *dev,
 889                                      struct ethtool_pauseparam *pause)
 890 {
 891         struct dsa_port *dp = dsa_slave_to_port(dev);
 892
 893         phylink_ethtool_get_pauseparam(dp->pl, pause);
 894 }
 895
 896 static int dsa_slave_set_pauseparam(struct net_device *dev,
 897                                     struct ethtool_pauseparam *pause)
 898 {
 899         struct dsa_port *dp = dsa_slave_to_port(dev);
 900
 901         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 902 }
 903
 904 #ifdef CONFIG_NET_POLL_CONTROLLER
 905 static int dsa_slave_netpoll_setup(struct net_device *dev,
 906                                    struct netpoll_info *ni)
 907 {
 908         struct net_device *master = dsa_slave_to_master(dev);
 909         struct dsa_slave_priv *p = netdev_priv(dev);
 910         struct netpoll *netpoll;
 911         int err = 0;
 912
 913         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 914         if (!netpoll)
 915                 return -ENOMEM;
 916
 917         err = __netpoll_setup(netpoll, master);
 918         if (err) {
 919                 kfree(netpoll);
 920                 goto out;
 921         }
 922
 923         p->netpoll = netpoll;
 924 out:
 925         return err;
 926 }
 927
 928 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 929 {
 930         struct dsa_slave_priv *p = netdev_priv(dev);
 931         struct netpoll *netpoll = p->netpoll;
 932
 933         if (!netpoll)
 934                 return;
 935
 936         p->netpoll = NULL;
 937
 938         __netpoll_free(netpoll);
 939 }
 940
 941 static void dsa_slave_poll_controller(struct net_device *dev)
 942 {
 943 }
 944 #endif
 945
 946 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 947                                         char *name, size_t len)
 948 {
 949         struct dsa_port *dp = dsa_slave_to_port(dev);
 950
 951         /* For non-legacy ports, devlink is used and it takes
 952          * care of the name generation. This ndo implementation
 953          * should be removed with legacy support.
 954          */
 955         if (dp->ds->devlink)
 956                 return -EOPNOTSUPP;
 957
 958         if (snprintf(name, len, "p%d", dp->index) >= len)
 959                 return -EINVAL;
 960
 961         return 0;
 962 }
 963
 964 static struct dsa_mall_tc_entry *
 965 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 966 {
 967         struct dsa_slave_priv *p = netdev_priv(dev);
 968         struct dsa_mall_tc_entry *mall_tc_entry;
 969
 970         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 971                 if (mall_tc_entry->cookie == cookie)
 972                         return mall_tc_entry;
 973
 974         return NULL;
 975 }
 976
 977 static int
 978 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 979                                   struct tc_cls_matchall_offload *cls,
 980                                   bool ingress)
 981 {
 982         struct dsa_port *dp = dsa_slave_to_port(dev);
 983         struct dsa_slave_priv *p = netdev_priv(dev);
 984         struct dsa_mall_mirror_tc_entry *mirror;
 985         struct dsa_mall_tc_entry *mall_tc_entry;
 986         struct dsa_switch *ds = dp->ds;
 987         struct flow_action_entry *act;
 988         struct dsa_port *to_dp;
 989         int err;
 990
 991         if (!ds->ops->port_mirror_add)
 992                 return -EOPNOTSUPP;
 993
 994         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 995                                               cls->common.extack))
 996                 return -EOPNOTSUPP;
 997
 998         act = &cls->rule->action.entries[0];
 999
1000         if (!act->dev)
1001                 return -EINVAL;
1002
1003         if (!dsa_slave_dev_check(act->dev))
1004                 return -EOPNOTSUPP;
1005
1006         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1007         if (!mall_tc_entry)
1008                 return -ENOMEM;
1009
1010         mall_tc_entry->cookie = cls->cookie;
1011         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1012         mirror = &mall_tc_entry->mirror;
1013
1014         to_dp = dsa_slave_to_port(act->dev);
1015
1016         mirror->to_local_port = to_dp->index;
1017         mirror->ingress = ingress;
1018
1019         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
1020         if (err) {
1021                 kfree(mall_tc_entry);
1022                 return err;
1023         }
1024
1025         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1026
1027         return err;
1028 }
1029
1030 static int
1031 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1032                                   struct tc_cls_matchall_offload *cls,
1033                                   bool ingress)
1034 {
1035         struct netlink_ext_ack *extack = cls->common.extack;
1036         struct dsa_port *dp = dsa_slave_to_port(dev);
1037         struct dsa_slave_priv *p = netdev_priv(dev);
1038         struct dsa_mall_policer_tc_entry *policer;
1039         struct dsa_mall_tc_entry *mall_tc_entry;
1040         struct dsa_switch *ds = dp->ds;
1041         struct flow_action_entry *act;
1042         int err;
1043
1044         if (!ds->ops->port_policer_add) {
1045                 NL_SET_ERR_MSG_MOD(extack,
1046                                    "Policing offload not implemented");
1047                 return -EOPNOTSUPP;
1048         }
1049
1050         if (!ingress) {
1051                 NL_SET_ERR_MSG_MOD(extack,
1052                                    "Only supported on ingress qdisc");
1053                 return -EOPNOTSUPP;
1054         }
1055
1056         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1057                                               cls->common.extack))
1058                 return -EOPNOTSUPP;
1059
1060         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1061                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1062                         NL_SET_ERR_MSG_MOD(extack,
1063                                            "Only one port policer allowed");
1064                         return -EEXIST;
1065                 }
1066         }
1067
1068         act = &cls->rule->action.entries[0];
1069
1070         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1071         if (!mall_tc_entry)
1072                 return -ENOMEM;
1073
1074         mall_tc_entry->cookie = cls->cookie;
1075         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1076         policer = &mall_tc_entry->policer;
1077         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1078         policer->burst = act->police.burst;
1079
1080         err = ds->ops->port_policer_add(ds, dp->index, policer);
1081         if (err) {
1082                 kfree(mall_tc_entry);
1083                 return err;
1084         }
1085
1086         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1087
1088         return err;
1089 }
1090
1091 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1092                                       struct tc_cls_matchall_offload *cls,
1093                                       bool ingress)
1094 {
1095         int err = -EOPNOTSUPP;
1096
1097         if (cls->common.protocol == htons(ETH_P_ALL) &&
1098             flow_offload_has_one_action(&cls->rule->action) &&
1099             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1100                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1101         else if (flow_offload_has_one_action(&cls->rule->action) &&
1102                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1103                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1104
1105         return err;
1106 }
1107
1108 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1109                                        struct tc_cls_matchall_offload *cls)
1110 {
1111         struct dsa_port *dp = dsa_slave_to_port(dev);
1112         struct dsa_mall_tc_entry *mall_tc_entry;
1113         struct dsa_switch *ds = dp->ds;
1114
1115         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1116         if (!mall_tc_entry)
1117                 return;
1118
1119         list_del(&mall_tc_entry->list);
1120
1121         switch (mall_tc_entry->type) {
1122         case DSA_PORT_MALL_MIRROR:
1123                 if (ds->ops->port_mirror_del)
1124                         ds->ops->port_mirror_del(ds, dp->index,
1125                                                  &mall_tc_entry->mirror);
1126                 break;
1127         case DSA_PORT_MALL_POLICER:
1128                 if (ds->ops->port_policer_del)
1129                         ds->ops->port_policer_del(ds, dp->index);
1130                 break;
1131         default:
1132                 WARN_ON(1);
1133         }
1134
1135         kfree(mall_tc_entry);
1136 }
1137
1138 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1139                                            struct tc_cls_matchall_offload *cls,
1140                                            bool ingress)
1141 {
1142         if (cls->common.chain_index)
1143                 return -EOPNOTSUPP;
1144
1145         switch (cls->command) {
1146         case TC_CLSMATCHALL_REPLACE:
1147                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1148         case TC_CLSMATCHALL_DESTROY:
1149                 dsa_slave_del_cls_matchall(dev, cls);
1150                 return 0;
1151         default:
1152                 return -EOPNOTSUPP;
1153         }
1154 }
1155
1156 static int dsa_slave_add_cls_flower(struct net_device *dev,
1157                                     struct flow_cls_offload *cls,
1158                                     bool ingress)
1159 {
1160         struct dsa_port *dp = dsa_slave_to_port(dev);
1161         struct dsa_switch *ds = dp->ds;
1162         int port = dp->index;
1163
1164         if (!ds->ops->cls_flower_add)
1165                 return -EOPNOTSUPP;
1166
1167         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1168 }
1169
1170 static int dsa_slave_del_cls_flower(struct net_device *dev,
1171                                     struct flow_cls_offload *cls,
1172                                     bool ingress)
1173 {
1174         struct dsa_port *dp = dsa_slave_to_port(dev);
1175         struct dsa_switch *ds = dp->ds;
1176         int port = dp->index;
1177
1178         if (!ds->ops->cls_flower_del)
1179                 return -EOPNOTSUPP;
1180
1181         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1182 }
1183
1184 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1185                                       struct flow_cls_offload *cls,
1186                                       bool ingress)
1187 {
1188         struct dsa_port *dp = dsa_slave_to_port(dev);
1189         struct dsa_switch *ds = dp->ds;
1190         int port = dp->index;
1191
1192         if (!ds->ops->cls_flower_stats)
1193                 return -EOPNOTSUPP;
1194
1195         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1196 }
1197
1198 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1199                                          struct flow_cls_offload *cls,
1200                                          bool ingress)
1201 {
1202         switch (cls->command) {
1203         case FLOW_CLS_REPLACE:
1204                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1205         case FLOW_CLS_DESTROY:
1206                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1207         case FLOW_CLS_STATS:
1208                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1209         default:
1210                 return -EOPNOTSUPP;
1211         }
1212 }
1213
1214 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1215                                        void *cb_priv, bool ingress)
1216 {
1217         struct net_device *dev = cb_priv;
1218
1219         if (!tc_can_offload(dev))
1220                 return -EOPNOTSUPP;
1221
1222         switch (type) {
1223         case TC_SETUP_CLSMATCHALL:
1224                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1225         case TC_SETUP_CLSFLOWER:
1226                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1227         default:
1228                 return -EOPNOTSUPP;
1229         }
1230 }
1231
1232 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1233                                           void *type_data, void *cb_priv)
1234 {
1235         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1236 }
1237
1238 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1239                                           void *type_data, void *cb_priv)
1240 {
1241         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1242 }
1243
1244 static LIST_HEAD(dsa_slave_block_cb_list);
1245
1246 static int dsa_slave_setup_tc_block(struct net_device *dev,
1247                                     struct flow_block_offload *f)
1248 {
1249         struct flow_block_cb *block_cb;
1250         flow_setup_cb_t *cb;
1251
1252         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1253                 cb = dsa_slave_setup_tc_block_cb_ig;
1254         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1255                 cb = dsa_slave_setup_tc_block_cb_eg;
1256         else
1257                 return -EOPNOTSUPP;
1258
1259         f->driver_block_list = &dsa_slave_block_cb_list;
1260
1261         switch (f->command) {
1262         case FLOW_BLOCK_BIND:
1263                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1264                         return -EBUSY;
1265
1266                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1267                 if (IS_ERR(block_cb))
1268                         return PTR_ERR(block_cb);
1269
1270                 flow_block_cb_add(block_cb, f);
1271                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1272                 return 0;
1273         case FLOW_BLOCK_UNBIND:
1274                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1275                 if (!block_cb)
1276                         return -ENOENT;
1277
1278                 flow_block_cb_remove(block_cb, f);
1279                 list_del(&block_cb->driver_list);
1280                 return 0;
1281         default:
1282                 return -EOPNOTSUPP;
1283         }
1284 }
1285
1286 static int dsa_slave_setup_ft_block(struct dsa_switch *ds, int port,
1287                                     void *type_data)
1288 {
1289         struct dsa_port *cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1290         struct net_device *master = cpu_dp->master;
1291
1292         if (!master->netdev_ops->ndo_setup_tc)
1293                 return -EOPNOTSUPP;
1294
1295         return master->netdev_ops->ndo_setup_tc(master, TC_SETUP_FT, type_data);
1296 }
1297
1298 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1299                               void *type_data)
1300 {
1301         struct dsa_port *dp = dsa_slave_to_port(dev);
1302         struct dsa_switch *ds = dp->ds;
1303
1304         switch (type) {
1305         case TC_SETUP_BLOCK:
1306                 return dsa_slave_setup_tc_block(dev, type_data);
1307         case TC_SETUP_FT:
1308                 return dsa_slave_setup_ft_block(ds, dp->index, type_data);
1309         default:
1310                 break;
1311         }
1312
1313         if (!ds->ops->port_setup_tc)
1314                 return -EOPNOTSUPP;
1315
1316         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1317 }
1318
1319 static int dsa_slave_get_rxnfc(struct net_device *dev,
1320                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1321 {
1322         struct dsa_port *dp = dsa_slave_to_port(dev);
1323         struct dsa_switch *ds = dp->ds;
1324
1325         if (!ds->ops->get_rxnfc)
1326                 return -EOPNOTSUPP;
1327
1328         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1329 }
1330
1331 static int dsa_slave_set_rxnfc(struct net_device *dev,
1332                                struct ethtool_rxnfc *nfc)
1333 {
1334         struct dsa_port *dp = dsa_slave_to_port(dev);
1335         struct dsa_switch *ds = dp->ds;
1336
1337         if (!ds->ops->set_rxnfc)
1338                 return -EOPNOTSUPP;
1339
1340         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1341 }
1342
1343 static int dsa_slave_get_ts_info(struct net_device *dev,
1344                                  struct ethtool_ts_info *ts)
1345 {
1346         struct dsa_slave_priv *p = netdev_priv(dev);
1347         struct dsa_switch *ds = p->dp->ds;
1348
1349         if (!ds->ops->get_ts_info)
1350                 return -EOPNOTSUPP;
1351
1352         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1353 }
1354
1355 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1356                                      u16 vid)
1357 {
1358         struct net_device *master = dsa_slave_to_master(dev);
1359         struct dsa_port *dp = dsa_slave_to_port(dev);
1360         struct switchdev_obj_port_vlan vlan = {
1361                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1362                 .vid = vid,
1363                 /* This API only allows programming tagged, non-PVID VIDs */
1364                 .flags = 0,
1365         };
1366         struct netlink_ext_ack extack = {0};
1367         int ret;
1368
1369         /* User port... */
1370         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1371         if (ret) {
1372                 if (extack._msg)
1373                         netdev_err(dev, "%s\n", extack._msg);
1374                 return ret;
1375         }
1376
1377         /* And CPU port... */
1378         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &extack);
1379         if (ret) {
1380                 if (extack._msg)
1381                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1382                                    extack._msg);
1383                 return ret;
1384         }
1385
1386         return vlan_vid_add(master, proto, vid);
1387 }
1388
1389 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1390                                       u16 vid)
1391 {
1392         struct net_device *master = dsa_slave_to_master(dev);
1393         struct dsa_port *dp = dsa_slave_to_port(dev);
1394         struct switchdev_obj_port_vlan vlan = {
1395                 .vid = vid,
1396                 /* This API only allows programming tagged, non-PVID VIDs */
1397                 .flags = 0,
1398         };
1399         int err;
1400
1401         /* Do not deprogram the CPU port as it may be shared with other user
1402          * ports which can be members of this VLAN as well.
1403          */
1404         err = dsa_port_vlan_del(dp, &vlan);
1405         if (err)
1406                 return err;
1407
1408         vlan_vid_del(master, proto, vid);
1409
1410         return 0;
1411 }
1412
1413 struct dsa_hw_port {
1414         struct list_head list;
1415         struct net_device *dev;
1416         int old_mtu;
1417 };
1418
1419 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1420 {
1421         const struct dsa_hw_port *p;
1422         int err;
1423
1424         list_for_each_entry(p, hw_port_list, list) {
1425                 if (p->dev->mtu == mtu)
1426                         continue;
1427
1428                 err = dev_set_mtu(p->dev, mtu);
1429                 if (err)
1430                         goto rollback;
1431         }
1432
1433         return 0;
1434
1435 rollback:
1436         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1437                 if (p->dev->mtu == p->old_mtu)
1438                         continue;
1439
1440                 if (dev_set_mtu(p->dev, p->old_mtu))
1441                         netdev_err(p->dev, "Failed to restore MTU\n");
1442         }
1443
1444         return err;
1445 }
1446
1447 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1448 {
1449         struct dsa_hw_port *p, *n;
1450
1451         list_for_each_entry_safe(p, n, hw_port_list, list)
1452                 kfree(p);
1453 }
1454
1455 /* Make the hardware datapath to/from @dev limited to a common MTU */
1456 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1457 {
1458         struct list_head hw_port_list;
1459         struct dsa_switch_tree *dst;
1460         int min_mtu = ETH_MAX_MTU;
1461         struct dsa_port *other_dp;
1462         int err;
1463
1464         if (!dp->ds->mtu_enforcement_ingress)
1465                 return;
1466
1467         if (!dp->bridge_dev)
1468                 return;
1469
1470         INIT_LIST_HEAD(&hw_port_list);
1471
1472         /* Populate the list of ports that are part of the same bridge
1473          * as the newly added/modified port
1474          */
1475         list_for_each_entry(dst, &dsa_tree_list, list) {
1476                 list_for_each_entry(other_dp, &dst->ports, list) {
1477                         struct dsa_hw_port *hw_port;
1478                         struct net_device *slave;
1479
1480                         if (other_dp->type != DSA_PORT_TYPE_USER)
1481                                 continue;
1482
1483                         if (other_dp->bridge_dev != dp->bridge_dev)
1484                                 continue;
1485
1486                         if (!other_dp->ds->mtu_enforcement_ingress)
1487                                 continue;
1488
1489                         slave = other_dp->slave;
1490
1491                         if (min_mtu > slave->mtu)
1492                                 min_mtu = slave->mtu;
1493
1494                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1495                         if (!hw_port)
1496                                 goto out;
1497
1498                         hw_port->dev = slave;
1499                         hw_port->old_mtu = slave->mtu;
1500
1501                         list_add(&hw_port->list, &hw_port_list);
1502                 }
1503         }
1504
1505         /* Attempt to configure the entire hardware bridge to the newly added
1506          * interface's MTU first, regardless of whether the intention of the
1507          * user was to raise or lower it.
1508          */
1509         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1510         if (!err)
1511                 goto out;
1512
1513         /* Clearly that didn't work out so well, so just set the minimum MTU on
1514          * all hardware bridge ports now. If this fails too, then all ports will
1515          * still have their old MTU rolled back anyway.
1516          */
1517         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1518
1519 out:
1520         dsa_hw_port_list_free(&hw_port_list);
1521 }
1522
1523 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1524 {
1525         struct net_device *master = dsa_slave_to_master(dev);
1526         struct dsa_port *dp = dsa_slave_to_port(dev);
1527         struct dsa_slave_priv *p = netdev_priv(dev);
1528         struct dsa_switch *ds = p->dp->ds;
1529         struct dsa_port *cpu_dp;
1530         int port = p->dp->index;
1531         int largest_mtu = 0;
1532         int new_master_mtu;
1533         int old_master_mtu;
1534         int mtu_limit;
1535         int cpu_mtu;
1536         int err, i;
1537
1538         if (!ds->ops->port_change_mtu)
1539                 return -EOPNOTSUPP;
1540
1541         for (i = 0; i < ds->num_ports; i++) {
1542                 int slave_mtu;
1543
1544                 if (!dsa_is_user_port(ds, i))
1545                         continue;
1546
1547                 /* During probe, this function will be called for each slave
1548                  * device, while not all of them have been allocated. That's
1549                  * ok, it doesn't change what the maximum is, so ignore it.
1550                  */
1551                 if (!dsa_to_port(ds, i)->slave)
1552                         continue;
1553
1554                 /* Pretend that we already applied the setting, which we
1555                  * actually haven't (still haven't done all integrity checks)
1556                  */
1557                 if (i == port)
1558                         slave_mtu = new_mtu;
1559                 else
1560                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1561
1562                 if (largest_mtu < slave_mtu)
1563                         largest_mtu = slave_mtu;
1564         }
1565
1566         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1567
1568         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1569         old_master_mtu = master->mtu;
1570         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1571         if (new_master_mtu > mtu_limit)
1572                 return -ERANGE;
1573
1574         /* If the master MTU isn't over limit, there's no need to check the CPU
1575          * MTU, since that surely isn't either.
1576          */
1577         cpu_mtu = largest_mtu;
1578
1579         /* Start applying stuff */
1580         if (new_master_mtu != old_master_mtu) {
1581                 err = dev_set_mtu(master, new_master_mtu);
1582                 if (err < 0)
1583                         goto out_master_failed;
1584
1585                 /* We only need to propagate the MTU of the CPU port to
1586                  * upstream switches.
1587                  */
1588                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1589                 if (err)
1590                         goto out_cpu_failed;
1591         }
1592
1593         err = dsa_port_mtu_change(dp, new_mtu, false);
1594         if (err)
1595                 goto out_port_failed;
1596
1597         dev->mtu = new_mtu;
1598
1599         dsa_bridge_mtu_normalization(dp);
1600
1601         return 0;
1602
1603 out_port_failed:
1604         if (new_master_mtu != old_master_mtu)
1605                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1606                                     cpu_dp->tag_ops->overhead,
1607                                     true);
1608 out_cpu_failed:
1609         if (new_master_mtu != old_master_mtu)
1610                 dev_set_mtu(master, old_master_mtu);
1611 out_master_failed:
1612         return err;
1613 }
1614
1615 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1616         .get_drvinfo            = dsa_slave_get_drvinfo,
1617         .get_regs_len           = dsa_slave_get_regs_len,
1618         .get_regs               = dsa_slave_get_regs,
1619         .nway_reset             = dsa_slave_nway_reset,
1620         .get_link               = ethtool_op_get_link,
1621         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1622         .get_eeprom             = dsa_slave_get_eeprom,
1623         .set_eeprom             = dsa_slave_set_eeprom,
1624         .get_strings            = dsa_slave_get_strings,
1625         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1626         .get_sset_count         = dsa_slave_get_sset_count,
1627         .set_wol                = dsa_slave_set_wol,
1628         .get_wol                = dsa_slave_get_wol,
1629         .set_eee                = dsa_slave_set_eee,
1630         .get_eee                = dsa_slave_get_eee,
1631         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1632         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1633         .get_pauseparam         = dsa_slave_get_pauseparam,
1634         .set_pauseparam         = dsa_slave_set_pauseparam,
1635         .get_rxnfc              = dsa_slave_get_rxnfc,
1636         .set_rxnfc              = dsa_slave_set_rxnfc,
1637         .get_ts_info            = dsa_slave_get_ts_info,
1638         .self_test              = dsa_slave_net_selftest,
1639 };
1640
1641 /* legacy way, bypassing the bridge *****************************************/
1642 static int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1643                               struct net_device *dev,
1644                               const unsigned char *addr, u16 vid,
1645                               u16 flags,
1646                               struct netlink_ext_ack *extack)
1647 {
1648         struct dsa_port *dp = dsa_slave_to_port(dev);
1649
1650         return dsa_port_fdb_add(dp, addr, vid);
1651 }
1652
1653 static int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1654                               struct net_device *dev,
1655                               const unsigned char *addr, u16 vid)
1656 {
1657         struct dsa_port *dp = dsa_slave_to_port(dev);
1658
1659         return dsa_port_fdb_del(dp, addr, vid);
1660 }
1661
1662 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1663 {
1664         struct dsa_port *dp = dsa_slave_to_port(dev);
1665
1666         return dp->ds->devlink ? &dp->devlink_port : NULL;
1667 }
1668
1669 static void dsa_slave_get_stats64(struct net_device *dev,
1670                                   struct rtnl_link_stats64 *s)
1671 {
1672         struct dsa_port *dp = dsa_slave_to_port(dev);
1673         struct dsa_switch *ds = dp->ds;
1674
1675         if (ds->ops->get_stats64)
1676                 ds->ops->get_stats64(ds, dp->index, s);
1677         else
1678                 dev_get_tstats64(dev, s);
1679 }
1680
1681 static int dsa_slave_fill_forward_path(struct net_device_path_ctx *ctx,
1682                                        struct net_device_path *path)
1683 {
1684         struct dsa_port *dp = dsa_slave_to_port(ctx->dev);
1685         struct dsa_port *cpu_dp = dp->cpu_dp;
1686
1687         path->dev = ctx->dev;
1688         path->type = DEV_PATH_DSA;
1689         path->dsa.proto = cpu_dp->tag_ops->proto;
1690         path->dsa.port = dp->index;
1691         ctx->dev = cpu_dp->master;
1692
1693         return 0;
1694 }
1695
1696 static const struct net_device_ops dsa_slave_netdev_ops = {
1697         .ndo_open               = dsa_slave_open,
1698         .ndo_stop               = dsa_slave_close,
1699         .ndo_start_xmit         = dsa_slave_xmit,
1700         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1701         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1702         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1703         .ndo_fdb_add            = dsa_legacy_fdb_add,
1704         .ndo_fdb_del            = dsa_legacy_fdb_del,
1705         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1706         .ndo_do_ioctl           = dsa_slave_ioctl,
1707         .ndo_get_iflink         = dsa_slave_get_iflink,
1708 #ifdef CONFIG_NET_POLL_CONTROLLER
1709         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1710         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1711         .ndo_poll_controller    = dsa_slave_poll_controller,
1712 #endif
1713         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1714         .ndo_setup_tc           = dsa_slave_setup_tc,
1715         .ndo_get_stats64        = dsa_slave_get_stats64,
1716         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1717         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1718         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1719         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1720         .ndo_change_mtu         = dsa_slave_change_mtu,
1721         .ndo_fill_forward_path  = dsa_slave_fill_forward_path,
1722 };
1723
1724 static struct device_type dsa_type = {
1725         .name   = "dsa",
1726 };
1727
1728 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1729 {
1730         const struct dsa_port *dp = dsa_to_port(ds, port);
1731
1732         if (dp->pl)
1733                 phylink_mac_change(dp->pl, up);
1734 }
1735 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1736
1737 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1738                                           struct phylink_link_state *state)
1739 {
1740         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1741         struct dsa_switch *ds = dp->ds;
1742
1743         /* No need to check that this operation is valid, the callback would
1744          * not be called if it was not.
1745          */
1746         ds->ops->phylink_fixed_state(ds, dp->index, state);
1747 }
1748
1749 /* slave device setup *******************************************************/
1750 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1751 {
1752         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1753         struct dsa_switch *ds = dp->ds;
1754
1755         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1756         if (!slave_dev->phydev) {
1757                 netdev_err(slave_dev, "no phy at %d\n", addr);
1758                 return -ENODEV;
1759         }
1760
1761         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1762 }
1763
1764 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1765 {
1766         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1767         struct device_node *port_dn = dp->dn;
1768         struct dsa_switch *ds = dp->ds;
1769         phy_interface_t mode;
1770         u32 phy_flags = 0;
1771         int ret;
1772
1773         ret = of_get_phy_mode(port_dn, &mode);
1774         if (ret)
1775                 mode = PHY_INTERFACE_MODE_NA;
1776
1777         dp->pl_config.dev = &slave_dev->dev;
1778         dp->pl_config.type = PHYLINK_NETDEV;
1779
1780         /* The get_fixed_state callback takes precedence over polling the
1781          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1782          * this if the switch provides such a callback.
1783          */
1784         if (ds->ops->phylink_fixed_state) {
1785                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1786                 dp->pl_config.poll_fixed_state = true;
1787         }
1788
1789         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1790                                 &dsa_port_phylink_mac_ops);
1791         if (IS_ERR(dp->pl)) {
1792                 netdev_err(slave_dev,
1793                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1794                 return PTR_ERR(dp->pl);
1795         }
1796
1797         if (ds->ops->get_phy_flags)
1798                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1799
1800         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1801         if (ret == -ENODEV && ds->slave_mii_bus) {
1802                 /* We could not connect to a designated PHY or SFP, so try to
1803                  * use the switch internal MDIO bus instead
1804                  */
1805                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1806                 if (ret) {
1807                         netdev_err(slave_dev,
1808                                    "failed to connect to port %d: %d\n",
1809                                    dp->index, ret);
1810                         phylink_destroy(dp->pl);
1811                         return ret;
1812                 }
1813         }
1814
1815         return ret;
1816 }
1817
1818 void dsa_slave_setup_tagger(struct net_device *slave)
1819 {
1820         struct dsa_port *dp = dsa_slave_to_port(slave);
1821         struct dsa_slave_priv *p = netdev_priv(slave);
1822         const struct dsa_port *cpu_dp = dp->cpu_dp;
1823         struct net_device *master = cpu_dp->master;
1824
1825         if (cpu_dp->tag_ops->tail_tag)
1826                 slave->needed_tailroom = cpu_dp->tag_ops->overhead;
1827         else
1828                 slave->needed_headroom = cpu_dp->tag_ops->overhead;
1829         /* Try to save one extra realloc later in the TX path (in the master)
1830          * by also inheriting the master's needed headroom and tailroom.
1831          * The 8021q driver also does this.
1832          */
1833         slave->needed_headroom += master->needed_headroom;
1834         slave->needed_tailroom += master->needed_tailroom;
1835
1836         p->xmit = cpu_dp->tag_ops->xmit;
1837 }
1838
1839 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1840 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1841                                             struct netdev_queue *txq,
1842                                             void *_unused)
1843 {
1844         lockdep_set_class(&txq->_xmit_lock,
1845                           &dsa_slave_netdev_xmit_lock_key);
1846 }
1847
1848 int dsa_slave_suspend(struct net_device *slave_dev)
1849 {
1850         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1851
1852         if (!netif_running(slave_dev))
1853                 return 0;
1854
1855         netif_device_detach(slave_dev);
1856
1857         rtnl_lock();
1858         phylink_stop(dp->pl);
1859         rtnl_unlock();
1860
1861         return 0;
1862 }
1863
1864 int dsa_slave_resume(struct net_device *slave_dev)
1865 {
1866         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1867
1868         if (!netif_running(slave_dev))
1869                 return 0;
1870
1871         netif_device_attach(slave_dev);
1872
1873         rtnl_lock();
1874         phylink_start(dp->pl);
1875         rtnl_unlock();
1876
1877         return 0;
1878 }
1879
1880 int dsa_slave_create(struct dsa_port *port)
1881 {
1882         const struct dsa_port *cpu_dp = port->cpu_dp;
1883         struct net_device *master = cpu_dp->master;
1884         struct dsa_switch *ds = port->ds;
1885         const char *name = port->name;
1886         struct net_device *slave_dev;
1887         struct dsa_slave_priv *p;
1888         int ret;
1889
1890         if (!ds->num_tx_queues)
1891                 ds->num_tx_queues = 1;
1892
1893         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1894                                      NET_NAME_UNKNOWN, ether_setup,
1895                                      ds->num_tx_queues, 1);
1896         if (slave_dev == NULL)
1897                 return -ENOMEM;
1898
1899         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1900         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1901                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1902         slave_dev->hw_features |= NETIF_F_HW_TC;
1903         slave_dev->features |= NETIF_F_LLTX;
1904         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1905         if (!is_zero_ether_addr(port->mac))
1906                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1907         else
1908                 eth_hw_addr_inherit(slave_dev, master);
1909         slave_dev->priv_flags |= IFF_NO_QUEUE;
1910         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1911         if (ds->ops->port_max_mtu)
1912                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1913         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1914
1915         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1916                                  NULL);
1917
1918         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1919         slave_dev->dev.of_node = port->dn;
1920         slave_dev->vlan_features = master->vlan_features;
1921
1922         p = netdev_priv(slave_dev);
1923         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1924         if (!slave_dev->tstats) {
1925                 free_netdev(slave_dev);
1926                 return -ENOMEM;
1927         }
1928
1929         ret = gro_cells_init(&p->gcells, slave_dev);
1930         if (ret)
1931                 goto out_free;
1932
1933         p->dp = port;
1934         INIT_LIST_HEAD(&p->mall_tc_list);
1935         port->slave = slave_dev;
1936         dsa_slave_setup_tagger(slave_dev);
1937
1938         rtnl_lock();
1939         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1940         rtnl_unlock();
1941         if (ret && ret != -EOPNOTSUPP)
1942                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1943                          ret, ETH_DATA_LEN, port->index);
1944
1945         netif_carrier_off(slave_dev);
1946
1947         ret = dsa_slave_phy_setup(slave_dev);
1948         if (ret) {
1949                 netdev_err(slave_dev,
1950                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1951                            ret, ds->dst->index, ds->index, port->index);
1952                 goto out_gcells;
1953         }
1954
1955         rtnl_lock();
1956
1957         ret = register_netdevice(slave_dev);
1958         if (ret) {
1959                 netdev_err(master, "error %d registering interface %s\n",
1960                            ret, slave_dev->name);
1961                 rtnl_unlock();
1962                 goto out_phy;
1963         }
1964
1965         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1966
1967         rtnl_unlock();
1968
1969         if (ret)
1970                 goto out_unregister;
1971
1972         return 0;
1973
1974 out_unregister:
1975         unregister_netdev(slave_dev);
1976 out_phy:
1977         rtnl_lock();
1978         phylink_disconnect_phy(p->dp->pl);
1979         rtnl_unlock();
1980         phylink_destroy(p->dp->pl);
1981 out_gcells:
1982         gro_cells_destroy(&p->gcells);
1983 out_free:
1984         free_percpu(slave_dev->tstats);
1985         free_netdev(slave_dev);
1986         port->slave = NULL;
1987         return ret;
1988 }
1989
1990 void dsa_slave_destroy(struct net_device *slave_dev)
1991 {
1992         struct net_device *master = dsa_slave_to_master(slave_dev);
1993         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1994         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1995
1996         netif_carrier_off(slave_dev);
1997         rtnl_lock();
1998         netdev_upper_dev_unlink(master, slave_dev);
1999         unregister_netdevice(slave_dev);
2000         phylink_disconnect_phy(dp->pl);
2001         rtnl_unlock();
2002
2003         phylink_destroy(dp->pl);
2004         gro_cells_destroy(&p->gcells);
2005         free_percpu(slave_dev->tstats);
2006         free_netdev(slave_dev);
2007 }
2008
2009 bool dsa_slave_dev_check(const struct net_device *dev)
2010 {
2011         return dev->netdev_ops == &dsa_slave_netdev_ops;
2012 }
2013 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
2014
2015 static int dsa_slave_changeupper(struct net_device *dev,
2016                                  struct netdev_notifier_changeupper_info *info)
2017 {
2018         struct dsa_port *dp = dsa_slave_to_port(dev);
2019         struct netlink_ext_ack *extack;
2020         int err = NOTIFY_DONE;
2021
2022         extack = netdev_notifier_info_to_extack(&info->info);
2023
2024         if (netif_is_bridge_master(info->upper_dev)) {
2025                 if (info->linking) {
2026                         err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2027                         if (!err)
2028                                 dsa_bridge_mtu_normalization(dp);
2029                         err = notifier_from_errno(err);
2030                 } else {
2031                         dsa_port_bridge_leave(dp, info->upper_dev);
2032                         err = NOTIFY_OK;
2033                 }
2034         } else if (netif_is_lag_master(info->upper_dev)) {
2035                 if (info->linking) {
2036                         err = dsa_port_lag_join(dp, info->upper_dev,
2037                                                 info->upper_info, extack);
2038                         if (err == -EOPNOTSUPP) {
2039                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2040                                                    "Offloading not supported");
2041                                 err = 0;
2042                         }
2043                         err = notifier_from_errno(err);
2044                 } else {
2045                         dsa_port_lag_leave(dp, info->upper_dev);
2046                         err = NOTIFY_OK;
2047                 }
2048         } else if (is_hsr_master(info->upper_dev)) {
2049                 if (info->linking) {
2050                         err = dsa_port_hsr_join(dp, info->upper_dev);
2051                         if (err == -EOPNOTSUPP) {
2052                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2053                                                    "Offloading not supported");
2054                                 err = 0;
2055                         }
2056                         err = notifier_from_errno(err);
2057                 } else {
2058                         dsa_port_hsr_leave(dp, info->upper_dev);
2059                         err = NOTIFY_OK;
2060                 }
2061         }
2062
2063         return err;
2064 }
2065
2066 static int
2067 dsa_slave_lag_changeupper(struct net_device *dev,
2068                           struct netdev_notifier_changeupper_info *info)
2069 {
2070         struct net_device *lower;
2071         struct list_head *iter;
2072         int err = NOTIFY_DONE;
2073         struct dsa_port *dp;
2074
2075         netdev_for_each_lower_dev(dev, lower, iter) {
2076                 if (!dsa_slave_dev_check(lower))
2077                         continue;
2078
2079                 dp = dsa_slave_to_port(lower);
2080                 if (!dp->lag_dev)
2081                         /* Software LAG */
2082                         continue;
2083
2084                 err = dsa_slave_changeupper(lower, info);
2085                 if (notifier_to_errno(err))
2086                         break;
2087         }
2088
2089         return err;
2090 }
2091
2092 static int
2093 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2094                                  struct netdev_notifier_changeupper_info *info)
2095 {
2096         struct netlink_ext_ack *ext_ack;
2097         struct net_device *slave;
2098         struct dsa_port *dp;
2099
2100         ext_ack = netdev_notifier_info_to_extack(&info->info);
2101
2102         if (!is_vlan_dev(dev))
2103                 return NOTIFY_DONE;
2104
2105         slave = vlan_dev_real_dev(dev);
2106         if (!dsa_slave_dev_check(slave))
2107                 return NOTIFY_DONE;
2108
2109         dp = dsa_slave_to_port(slave);
2110         if (!dp->bridge_dev)
2111                 return NOTIFY_DONE;
2112
2113         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2114         if (br_vlan_enabled(dp->bridge_dev) &&
2115             netif_is_bridge_master(info->upper_dev) && info->linking) {
2116                 NL_SET_ERR_MSG_MOD(ext_ack,
2117                                    "Cannot enslave VLAN device into VLAN aware bridge");
2118                 return notifier_from_errno(-EINVAL);
2119         }
2120
2121         return NOTIFY_DONE;
2122 }
2123
2124 static int
2125 dsa_slave_check_8021q_upper(struct net_device *dev,
2126                             struct netdev_notifier_changeupper_info *info)
2127 {
2128         struct dsa_port *dp = dsa_slave_to_port(dev);
2129         struct net_device *br = dp->bridge_dev;
2130         struct bridge_vlan_info br_info;
2131         struct netlink_ext_ack *extack;
2132         int err = NOTIFY_DONE;
2133         u16 vid;
2134
2135         if (!br || !br_vlan_enabled(br))
2136                 return NOTIFY_DONE;
2137
2138         extack = netdev_notifier_info_to_extack(&info->info);
2139         vid = vlan_dev_vlan_id(info->upper_dev);
2140
2141         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2142          * device, respectively the VID is not found, returning
2143          * 0 means success, which is a failure for us here.
2144          */
2145         err = br_vlan_get_info(br, vid, &br_info);
2146         if (err == 0) {
2147                 NL_SET_ERR_MSG_MOD(extack,
2148                                    "This VLAN is already configured by the bridge");
2149                 return notifier_from_errno(-EBUSY);
2150         }
2151
2152         return NOTIFY_DONE;
2153 }
2154
2155 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2156                                      unsigned long event, void *ptr)
2157 {
2158         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2159
2160         switch (event) {
2161         case NETDEV_PRECHANGEUPPER: {
2162                 struct netdev_notifier_changeupper_info *info = ptr;
2163                 struct dsa_switch *ds;
2164                 struct dsa_port *dp;
2165                 int err;
2166
2167                 if (!dsa_slave_dev_check(dev))
2168                         return dsa_prevent_bridging_8021q_upper(dev, ptr);
2169
2170                 dp = dsa_slave_to_port(dev);
2171                 ds = dp->ds;
2172
2173                 if (ds->ops->port_prechangeupper) {
2174                         err = ds->ops->port_prechangeupper(ds, dp->index, info);
2175                         if (err)
2176                                 return notifier_from_errno(err);
2177                 }
2178
2179                 if (is_vlan_dev(info->upper_dev))
2180                         return dsa_slave_check_8021q_upper(dev, ptr);
2181                 break;
2182         }
2183         case NETDEV_CHANGEUPPER:
2184                 if (dsa_slave_dev_check(dev))
2185                         return dsa_slave_changeupper(dev, ptr);
2186
2187                 if (netif_is_lag_master(dev))
2188                         return dsa_slave_lag_changeupper(dev, ptr);
2189
2190                 break;
2191         case NETDEV_CHANGELOWERSTATE: {
2192                 struct netdev_notifier_changelowerstate_info *info = ptr;
2193                 struct dsa_port *dp;
2194                 int err;
2195
2196                 if (!dsa_slave_dev_check(dev))
2197                         break;
2198
2199                 dp = dsa_slave_to_port(dev);
2200
2201                 err = dsa_port_lag_change(dp, info->lower_state_info);
2202                 return notifier_from_errno(err);
2203         }
2204         case NETDEV_GOING_DOWN: {
2205                 struct dsa_port *dp, *cpu_dp;
2206                 struct dsa_switch_tree *dst;
2207                 LIST_HEAD(close_list);
2208
2209                 if (!netdev_uses_dsa(dev))
2210                         return NOTIFY_DONE;
2211
2212                 cpu_dp = dev->dsa_ptr;
2213                 dst = cpu_dp->ds->dst;
2214
2215                 list_for_each_entry(dp, &dst->ports, list) {
2216                         if (!dsa_is_user_port(dp->ds, dp->index))
2217                                 continue;
2218
2219                         list_add(&dp->slave->close_list, &close_list);
2220                 }
2221
2222                 dev_close_many(&close_list, true);
2223
2224                 return NOTIFY_OK;
2225         }
2226         default:
2227                 break;
2228         }
2229
2230         return NOTIFY_DONE;
2231 }
2232
2233 static void
2234 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2235 {
2236         struct dsa_switch *ds = switchdev_work->ds;
2237         struct switchdev_notifier_fdb_info info;
2238         struct dsa_port *dp;
2239
2240         if (!dsa_is_user_port(ds, switchdev_work->port))
2241                 return;
2242
2243         info.addr = switchdev_work->addr;
2244         info.vid = switchdev_work->vid;
2245         info.offloaded = true;
2246         dp = dsa_to_port(ds, switchdev_work->port);
2247         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2248                                  dp->slave, &info.info, NULL);
2249 }
2250
2251 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2252 {
2253         struct dsa_switchdev_event_work *switchdev_work =
2254                 container_of(work, struct dsa_switchdev_event_work, work);
2255         struct dsa_switch *ds = switchdev_work->ds;
2256         struct dsa_port *dp;
2257         int err;
2258
2259         dp = dsa_to_port(ds, switchdev_work->port);
2260
2261         rtnl_lock();
2262         switch (switchdev_work->event) {
2263         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2264                 err = dsa_port_fdb_add(dp, switchdev_work->addr,
2265                                        switchdev_work->vid);
2266                 if (err) {
2267                         dev_err(ds->dev,
2268                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2269                                 dp->index, switchdev_work->addr,
2270                                 switchdev_work->vid, err);
2271                         break;
2272                 }
2273                 dsa_fdb_offload_notify(switchdev_work);
2274                 break;
2275
2276         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2277                 err = dsa_port_fdb_del(dp, switchdev_work->addr,
2278                                        switchdev_work->vid);
2279                 if (err) {
2280                         dev_err(ds->dev,
2281                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2282                                 dp->index, switchdev_work->addr,
2283                                 switchdev_work->vid, err);
2284                 }
2285
2286                 break;
2287         }
2288         rtnl_unlock();
2289
2290         kfree(switchdev_work);
2291         if (dsa_is_user_port(ds, dp->index))
2292                 dev_put(dp->slave);
2293 }
2294
2295 static int dsa_lower_dev_walk(struct net_device *lower_dev,
2296                               struct netdev_nested_priv *priv)
2297 {
2298         if (dsa_slave_dev_check(lower_dev)) {
2299                 priv->data = (void *)netdev_priv(lower_dev);
2300                 return 1;
2301         }
2302
2303         return 0;
2304 }
2305
2306 static struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev)
2307 {
2308         struct netdev_nested_priv priv = {
2309                 .data = NULL,
2310         };
2311
2312         netdev_walk_all_lower_dev_rcu(dev, dsa_lower_dev_walk, &priv);
2313
2314         return (struct dsa_slave_priv *)priv.data;
2315 }
2316
2317 /* Called under rcu_read_lock() */
2318 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2319                                      unsigned long event, void *ptr)
2320 {
2321         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2322         const struct switchdev_notifier_fdb_info *fdb_info;
2323         struct dsa_switchdev_event_work *switchdev_work;
2324         struct dsa_port *dp;
2325         int err;
2326
2327         switch (event) {
2328         case SWITCHDEV_PORT_ATTR_SET:
2329                 err = switchdev_handle_port_attr_set(dev, ptr,
2330                                                      dsa_slave_dev_check,
2331                                                      dsa_slave_port_attr_set);
2332                 return notifier_from_errno(err);
2333         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2334         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2335                 fdb_info = ptr;
2336
2337                 if (dsa_slave_dev_check(dev)) {
2338                         if (!fdb_info->added_by_user || fdb_info->is_local)
2339                                 return NOTIFY_OK;
2340
2341                         dp = dsa_slave_to_port(dev);
2342                 } else {
2343                         /* Snoop addresses learnt on foreign interfaces
2344                          * bridged with us, for switches that don't
2345                          * automatically learn SA from CPU-injected traffic
2346                          */
2347                         struct net_device *br_dev;
2348                         struct dsa_slave_priv *p;
2349
2350                         br_dev = netdev_master_upper_dev_get_rcu(dev);
2351                         if (!br_dev)
2352                                 return NOTIFY_DONE;
2353
2354                         if (!netif_is_bridge_master(br_dev))
2355                                 return NOTIFY_DONE;
2356
2357                         p = dsa_slave_dev_lower_find(br_dev);
2358                         if (!p)
2359                                 return NOTIFY_DONE;
2360
2361                         dp = p->dp->cpu_dp;
2362
2363                         if (!dp->ds->assisted_learning_on_cpu_port)
2364                                 return NOTIFY_DONE;
2365
2366                         /* When the bridge learns an address on an offloaded
2367                          * LAG we don't want to send traffic to the CPU, the
2368                          * other ports bridged with the LAG should be able to
2369                          * autonomously forward towards it.
2370                          */
2371                         if (dsa_tree_offloads_bridge_port(dp->ds->dst, dev))
2372                                 return NOTIFY_DONE;
2373                 }
2374
2375                 if (!dp->ds->ops->port_fdb_add || !dp->ds->ops->port_fdb_del)
2376                         return NOTIFY_DONE;
2377
2378                 switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2379                 if (!switchdev_work)
2380                         return NOTIFY_BAD;
2381
2382                 INIT_WORK(&switchdev_work->work,
2383                           dsa_slave_switchdev_event_work);
2384                 switchdev_work->ds = dp->ds;
2385                 switchdev_work->port = dp->index;
2386                 switchdev_work->event = event;
2387
2388                 ether_addr_copy(switchdev_work->addr,
2389                                 fdb_info->addr);
2390                 switchdev_work->vid = fdb_info->vid;
2391
2392                 /* Hold a reference on the slave for dsa_fdb_offload_notify */
2393                 if (dsa_is_user_port(dp->ds, dp->index))
2394                         dev_hold(dev);
2395                 dsa_schedule_work(&switchdev_work->work);
2396                 break;
2397         default:
2398                 return NOTIFY_DONE;
2399         }
2400
2401         return NOTIFY_OK;
2402 }
2403
2404 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2405                                               unsigned long event, void *ptr)
2406 {
2407         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2408         int err;
2409
2410         switch (event) {
2411         case SWITCHDEV_PORT_OBJ_ADD:
2412                 err = switchdev_handle_port_obj_add(dev, ptr,
2413                                                     dsa_slave_dev_check,
2414                                                     dsa_slave_port_obj_add);
2415                 return notifier_from_errno(err);
2416         case SWITCHDEV_PORT_OBJ_DEL:
2417                 err = switchdev_handle_port_obj_del(dev, ptr,
2418                                                     dsa_slave_dev_check,
2419                                                     dsa_slave_port_obj_del);
2420                 return notifier_from_errno(err);
2421         case SWITCHDEV_PORT_ATTR_SET:
2422                 err = switchdev_handle_port_attr_set(dev, ptr,
2423                                                      dsa_slave_dev_check,
2424                                                      dsa_slave_port_attr_set);
2425                 return notifier_from_errno(err);
2426         }
2427
2428         return NOTIFY_DONE;
2429 }
2430
2431 static struct notifier_block dsa_slave_nb __read_mostly = {
2432         .notifier_call  = dsa_slave_netdevice_event,
2433 };
2434
2435 struct notifier_block dsa_slave_switchdev_notifier = {
2436         .notifier_call = dsa_slave_switchdev_event,
2437 };
2438
2439 struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2440         .notifier_call = dsa_slave_switchdev_blocking_event,
2441 };
2442
2443 int dsa_slave_register_notifier(void)
2444 {
2445         struct notifier_block *nb;
2446         int err;
2447
2448         err = register_netdevice_notifier(&dsa_slave_nb);
2449         if (err)
2450                 return err;
2451
2452         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2453         if (err)
2454                 goto err_switchdev_nb;
2455
2456         nb = &dsa_slave_switchdev_blocking_notifier;
2457         err = register_switchdev_blocking_notifier(nb);
2458         if (err)
2459                 goto err_switchdev_blocking_nb;
2460
2461         return 0;
2462
2463 err_switchdev_blocking_nb:
2464         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2465 err_switchdev_nb:
2466         unregister_netdevice_notifier(&dsa_slave_nb);
2467         return err;
2468 }
2469
2470 void dsa_slave_unregister_notifier(void)
2471 {
2472         struct notifier_block *nb;
2473         int err;
2474
2475         nb = &dsa_slave_switchdev_blocking_notifier;
2476         err = unregister_switchdev_blocking_notifier(nb);
2477         if (err)
2478                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2479
2480         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2481         if (err)
2482                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2483
2484         err = unregister_netdevice_notifier(&dsa_slave_nb);
2485         if (err)
2486                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2487 }