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, const void *ctx,
 275                                    const struct switchdev_attr *attr,
 276                                    struct netlink_ext_ack *extack)
 277 {
 278         struct dsa_port *dp = dsa_slave_to_port(dev);
 279         int ret;
 280
 281         if (ctx && ctx != dp)
 282                 return 0;
 283
 284         switch (attr->id) {
 285         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 286                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 287                         return -EOPNOTSUPP;
 288
 289                 ret = dsa_port_set_state(dp, attr->u.stp_state);
 290                 break;
 291         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 292                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 293                         return -EOPNOTSUPP;
 294
 295                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 296                                               extack);
 297                 break;
 298         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 299                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 300                         return -EOPNOTSUPP;
 301
 302                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 303                 break;
 304         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 305                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 306                         return -EOPNOTSUPP;
 307
 308                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 309                                                 extack);
 310                 break;
 311         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 312                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 313                         return -EOPNOTSUPP;
 314
 315                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 316                 break;
 317         case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 318                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 319                         return -EOPNOTSUPP;
 320
 321                 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, extack);
 322                 break;
 323         default:
 324                 ret = -EOPNOTSUPP;
 325                 break;
 326         }
 327
 328         return ret;
 329 }
 330
 331 /* Must be called under rcu_read_lock() */
 332 static int
 333 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 334                                       const struct switchdev_obj_port_vlan *vlan)
 335 {
 336         struct net_device *upper_dev;
 337         struct list_head *iter;
 338
 339         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 340                 u16 vid;
 341
 342                 if (!is_vlan_dev(upper_dev))
 343                         continue;
 344
 345                 vid = vlan_dev_vlan_id(upper_dev);
 346                 if (vid == vlan->vid)
 347                         return -EBUSY;
 348         }
 349
 350         return 0;
 351 }
 352
 353 static int dsa_slave_vlan_add(struct net_device *dev,
 354                               const struct switchdev_obj *obj,
 355                               struct netlink_ext_ack *extack)
 356 {
 357         struct net_device *master = dsa_slave_to_master(dev);
 358         struct dsa_port *dp = dsa_slave_to_port(dev);
 359         struct switchdev_obj_port_vlan vlan;
 360         int err;
 361
 362         if (dsa_port_skip_vlan_configuration(dp)) {
 363                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 364                 return 0;
 365         }
 366
 367         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 368
 369         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 370          * the same VID.
 371          */
 372         if (br_vlan_enabled(dp->bridge_dev)) {
 373                 rcu_read_lock();
 374                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
 375                 rcu_read_unlock();
 376                 if (err) {
 377                         NL_SET_ERR_MSG_MOD(extack,
 378                                            "Port already has a VLAN upper with this VID");
 379                         return err;
 380                 }
 381         }
 382
 383         err = dsa_port_vlan_add(dp, &vlan, extack);
 384         if (err)
 385                 return err;
 386
 387         /* We need the dedicated CPU port to be a member of the VLAN as well.
 388          * Even though drivers often handle CPU membership in special ways,
 389          * it doesn't make sense to program a PVID, so clear this flag.
 390          */
 391         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 392
 393         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, extack);
 394         if (err)
 395                 return err;
 396
 397         return vlan_vid_add(master, htons(ETH_P_8021Q), vlan.vid);
 398 }
 399
 400 static int dsa_slave_port_obj_add(struct net_device *dev, const void *ctx,
 401                                   const struct switchdev_obj *obj,
 402                                   struct netlink_ext_ack *extack)
 403 {
 404         struct dsa_port *dp = dsa_slave_to_port(dev);
 405         int err;
 406
 407         if (ctx && ctx != dp)
 408                 return 0;
 409
 410         switch (obj->id) {
 411         case SWITCHDEV_OBJ_ID_PORT_MDB:
 412                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 413                         return -EOPNOTSUPP;
 414
 415                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 416                 break;
 417         case SWITCHDEV_OBJ_ID_HOST_MDB:
 418                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 419                         return -EOPNOTSUPP;
 420
 421                 /* DSA can directly translate this to a normal MDB add,
 422                  * but on the CPU port.
 423                  */
 424                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 425                 break;
 426         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 427                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 428                         return -EOPNOTSUPP;
 429
 430                 err = dsa_slave_vlan_add(dev, obj, extack);
 431                 break;
 432         case SWITCHDEV_OBJ_ID_MRP:
 433                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 434                         return -EOPNOTSUPP;
 435
 436                 err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 437                 break;
 438         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 439                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 440                         return -EOPNOTSUPP;
 441
 442                 err = dsa_port_mrp_add_ring_role(dp,
 443                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 444                 break;
 445         default:
 446                 err = -EOPNOTSUPP;
 447                 break;
 448         }
 449
 450         return err;
 451 }
 452
 453 static int dsa_slave_vlan_del(struct net_device *dev,
 454                               const struct switchdev_obj *obj)
 455 {
 456         struct net_device *master = dsa_slave_to_master(dev);
 457         struct dsa_port *dp = dsa_slave_to_port(dev);
 458         struct switchdev_obj_port_vlan *vlan;
 459         int err;
 460
 461         if (dsa_port_skip_vlan_configuration(dp))
 462                 return 0;
 463
 464         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 465
 466         /* Do not deprogram the CPU port as it may be shared with other user
 467          * ports which can be members of this VLAN as well.
 468          */
 469         err = dsa_port_vlan_del(dp, vlan);
 470         if (err)
 471                 return err;
 472
 473         vlan_vid_del(master, htons(ETH_P_8021Q), vlan->vid);
 474
 475         return 0;
 476 }
 477
 478 static int dsa_slave_port_obj_del(struct net_device *dev, const void *ctx,
 479                                   const struct switchdev_obj *obj)
 480 {
 481         struct dsa_port *dp = dsa_slave_to_port(dev);
 482         int err;
 483
 484         if (ctx && ctx != dp)
 485                 return 0;
 486
 487         switch (obj->id) {
 488         case SWITCHDEV_OBJ_ID_PORT_MDB:
 489                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 490                         return -EOPNOTSUPP;
 491
 492                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 493                 break;
 494         case SWITCHDEV_OBJ_ID_HOST_MDB:
 495                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 496                         return -EOPNOTSUPP;
 497
 498                 /* DSA can directly translate this to a normal MDB add,
 499                  * but on the CPU port.
 500                  */
 501                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 502                 break;
 503         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 504                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 505                         return -EOPNOTSUPP;
 506
 507                 err = dsa_slave_vlan_del(dev, obj);
 508                 break;
 509         case SWITCHDEV_OBJ_ID_MRP:
 510                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 511                         return -EOPNOTSUPP;
 512
 513                 err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 514                 break;
 515         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 516                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 517                         return -EOPNOTSUPP;
 518
 519                 err = dsa_port_mrp_del_ring_role(dp,
 520                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 521                 break;
 522         default:
 523                 err = -EOPNOTSUPP;
 524                 break;
 525         }
 526
 527         return err;
 528 }
 529
 530 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 531                                         struct netdev_phys_item_id *ppid)
 532 {
 533         struct dsa_port *dp = dsa_slave_to_port(dev);
 534         struct dsa_switch *ds = dp->ds;
 535         struct dsa_switch_tree *dst = ds->dst;
 536
 537         /* For non-legacy ports, devlink is used and it takes
 538          * care of the name generation. This ndo implementation
 539          * should be removed with legacy support.
 540          */
 541         if (dp->ds->devlink)
 542                 return -EOPNOTSUPP;
 543
 544         ppid->id_len = sizeof(dst->index);
 545         memcpy(&ppid->id, &dst->index, ppid->id_len);
 546
 547         return 0;
 548 }
 549
 550 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 551                                                      struct sk_buff *skb)
 552 {
 553 #ifdef CONFIG_NET_POLL_CONTROLLER
 554         struct dsa_slave_priv *p = netdev_priv(dev);
 555
 556         return netpoll_send_skb(p->netpoll, skb);
 557 #else
 558         BUG();
 559         return NETDEV_TX_OK;
 560 #endif
 561 }
 562
 563 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 564                                  struct sk_buff *skb)
 565 {
 566         struct dsa_switch *ds = p->dp->ds;
 567
 568         if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 569                 return;
 570
 571         if (!ds->ops->port_txtstamp)
 572                 return;
 573
 574         ds->ops->port_txtstamp(ds, p->dp->index, skb);
 575 }
 576
 577 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 578 {
 579         /* SKB for netpoll still need to be mangled with the protocol-specific
 580          * tag to be successfully transmitted
 581          */
 582         if (unlikely(netpoll_tx_running(dev)))
 583                 return dsa_slave_netpoll_send_skb(dev, skb);
 584
 585         /* Queue the SKB for transmission on the parent interface, but
 586          * do not modify its EtherType
 587          */
 588         skb->dev = dsa_slave_to_master(dev);
 589         dev_queue_xmit(skb);
 590
 591         return NETDEV_TX_OK;
 592 }
 593 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 594
 595 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 596 {
 597         int needed_headroom = dev->needed_headroom;
 598         int needed_tailroom = dev->needed_tailroom;
 599
 600         /* For tail taggers, we need to pad short frames ourselves, to ensure
 601          * that the tail tag does not fail at its role of being at the end of
 602          * the packet, once the master interface pads the frame. Account for
 603          * that pad length here, and pad later.
 604          */
 605         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 606                 needed_tailroom += ETH_ZLEN - skb->len;
 607         /* skb_headroom() returns unsigned int... */
 608         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 609         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 610
 611         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 612                 /* No reallocation needed, yay! */
 613                 return 0;
 614
 615         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 616                                 GFP_ATOMIC);
 617 }
 618
 619 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 620 {
 621         struct dsa_slave_priv *p = netdev_priv(dev);
 622         struct sk_buff *nskb;
 623
 624         dev_sw_netstats_tx_add(dev, 1, skb->len);
 625
 626         memset(skb->cb, 0, sizeof(skb->cb));
 627
 628         /* Handle tx timestamp if any */
 629         dsa_skb_tx_timestamp(p, skb);
 630
 631         if (dsa_realloc_skb(skb, dev)) {
 632                 dev_kfree_skb_any(skb);
 633                 return NETDEV_TX_OK;
 634         }
 635
 636         /* needed_tailroom should still be 'warm' in the cache line from
 637          * dsa_realloc_skb(), which has also ensured that padding is safe.
 638          */
 639         if (dev->needed_tailroom)
 640                 eth_skb_pad(skb);
 641
 642         /* Transmit function may have to reallocate the original SKB,
 643          * in which case it must have freed it. Only free it here on error.
 644          */
 645         nskb = p->xmit(skb, dev);
 646         if (!nskb) {
 647                 kfree_skb(skb);
 648                 return NETDEV_TX_OK;
 649         }
 650
 651         return dsa_enqueue_skb(nskb, dev);
 652 }
 653
 654 /* ethtool operations *******************************************************/
 655
 656 static void dsa_slave_get_drvinfo(struct net_device *dev,
 657                                   struct ethtool_drvinfo *drvinfo)
 658 {
 659         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 660         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 661         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 662 }
 663
 664 static int dsa_slave_get_regs_len(struct net_device *dev)
 665 {
 666         struct dsa_port *dp = dsa_slave_to_port(dev);
 667         struct dsa_switch *ds = dp->ds;
 668
 669         if (ds->ops->get_regs_len)
 670                 return ds->ops->get_regs_len(ds, dp->index);
 671
 672         return -EOPNOTSUPP;
 673 }
 674
 675 static void
 676 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 677 {
 678         struct dsa_port *dp = dsa_slave_to_port(dev);
 679         struct dsa_switch *ds = dp->ds;
 680
 681         if (ds->ops->get_regs)
 682                 ds->ops->get_regs(ds, dp->index, regs, _p);
 683 }
 684
 685 static int dsa_slave_nway_reset(struct net_device *dev)
 686 {
 687         struct dsa_port *dp = dsa_slave_to_port(dev);
 688
 689         return phylink_ethtool_nway_reset(dp->pl);
 690 }
 691
 692 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 693 {
 694         struct dsa_port *dp = dsa_slave_to_port(dev);
 695         struct dsa_switch *ds = dp->ds;
 696
 697         if (ds->cd && ds->cd->eeprom_len)
 698                 return ds->cd->eeprom_len;
 699
 700         if (ds->ops->get_eeprom_len)
 701                 return ds->ops->get_eeprom_len(ds);
 702
 703         return 0;
 704 }
 705
 706 static int dsa_slave_get_eeprom(struct net_device *dev,
 707                                 struct ethtool_eeprom *eeprom, u8 *data)
 708 {
 709         struct dsa_port *dp = dsa_slave_to_port(dev);
 710         struct dsa_switch *ds = dp->ds;
 711
 712         if (ds->ops->get_eeprom)
 713                 return ds->ops->get_eeprom(ds, eeprom, data);
 714
 715         return -EOPNOTSUPP;
 716 }
 717
 718 static int dsa_slave_set_eeprom(struct net_device *dev,
 719                                 struct ethtool_eeprom *eeprom, u8 *data)
 720 {
 721         struct dsa_port *dp = dsa_slave_to_port(dev);
 722         struct dsa_switch *ds = dp->ds;
 723
 724         if (ds->ops->set_eeprom)
 725                 return ds->ops->set_eeprom(ds, eeprom, data);
 726
 727         return -EOPNOTSUPP;
 728 }
 729
 730 static void dsa_slave_get_strings(struct net_device *dev,
 731                                   uint32_t stringset, uint8_t *data)
 732 {
 733         struct dsa_port *dp = dsa_slave_to_port(dev);
 734         struct dsa_switch *ds = dp->ds;
 735
 736         if (stringset == ETH_SS_STATS) {
 737                 int len = ETH_GSTRING_LEN;
 738
 739                 strncpy(data, "tx_packets", len);
 740                 strncpy(data + len, "tx_bytes", len);
 741                 strncpy(data + 2 * len, "rx_packets", len);
 742                 strncpy(data + 3 * len, "rx_bytes", len);
 743                 if (ds->ops->get_strings)
 744                         ds->ops->get_strings(ds, dp->index, stringset,
 745                                              data + 4 * len);
 746         } else if (stringset ==  ETH_SS_TEST) {
 747                 net_selftest_get_strings(data);
 748         }
 749
 750 }
 751
 752 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 753                                         struct ethtool_stats *stats,
 754                                         uint64_t *data)
 755 {
 756         struct dsa_port *dp = dsa_slave_to_port(dev);
 757         struct dsa_switch *ds = dp->ds;
 758         struct pcpu_sw_netstats *s;
 759         unsigned int start;
 760         int i;
 761
 762         for_each_possible_cpu(i) {
 763                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 764
 765                 s = per_cpu_ptr(dev->tstats, i);
 766                 do {
 767                         start = u64_stats_fetch_begin_irq(&s->syncp);
 768                         tx_packets = s->tx_packets;
 769                         tx_bytes = s->tx_bytes;
 770                         rx_packets = s->rx_packets;
 771                         rx_bytes = s->rx_bytes;
 772                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 773                 data[0] += tx_packets;
 774                 data[1] += tx_bytes;
 775                 data[2] += rx_packets;
 776                 data[3] += rx_bytes;
 777         }
 778         if (ds->ops->get_ethtool_stats)
 779                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 780 }
 781
 782 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 783 {
 784         struct dsa_port *dp = dsa_slave_to_port(dev);
 785         struct dsa_switch *ds = dp->ds;
 786
 787         if (sset == ETH_SS_STATS) {
 788                 int count = 0;
 789
 790                 if (ds->ops->get_sset_count) {
 791                         count = ds->ops->get_sset_count(ds, dp->index, sset);
 792                         if (count < 0)
 793                                 return count;
 794                 }
 795
 796                 return count + 4;
 797         } else if (sset ==  ETH_SS_TEST) {
 798                 return net_selftest_get_count();
 799         }
 800
 801         return -EOPNOTSUPP;
 802 }
 803
 804 static void dsa_slave_net_selftest(struct net_device *ndev,
 805                                    struct ethtool_test *etest, u64 *buf)
 806 {
 807         struct dsa_port *dp = dsa_slave_to_port(ndev);
 808         struct dsa_switch *ds = dp->ds;
 809
 810         if (ds->ops->self_test) {
 811                 ds->ops->self_test(ds, dp->index, etest, buf);
 812                 return;
 813         }
 814
 815         net_selftest(ndev, etest, buf);
 816 }
 817
 818 static void dsa_slave_get_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
 823         phylink_ethtool_get_wol(dp->pl, w);
 824
 825         if (ds->ops->get_wol)
 826                 ds->ops->get_wol(ds, dp->index, w);
 827 }
 828
 829 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 830 {
 831         struct dsa_port *dp = dsa_slave_to_port(dev);
 832         struct dsa_switch *ds = dp->ds;
 833         int ret = -EOPNOTSUPP;
 834
 835         phylink_ethtool_set_wol(dp->pl, w);
 836
 837         if (ds->ops->set_wol)
 838                 ret = ds->ops->set_wol(ds, dp->index, w);
 839
 840         return ret;
 841 }
 842
 843 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 844 {
 845         struct dsa_port *dp = dsa_slave_to_port(dev);
 846         struct dsa_switch *ds = dp->ds;
 847         int ret;
 848
 849         /* Port's PHY and MAC both need to be EEE capable */
 850         if (!dev->phydev || !dp->pl)
 851                 return -ENODEV;
 852
 853         if (!ds->ops->set_mac_eee)
 854                 return -EOPNOTSUPP;
 855
 856         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 857         if (ret)
 858                 return ret;
 859
 860         return phylink_ethtool_set_eee(dp->pl, e);
 861 }
 862
 863 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 864 {
 865         struct dsa_port *dp = dsa_slave_to_port(dev);
 866         struct dsa_switch *ds = dp->ds;
 867         int ret;
 868
 869         /* Port's PHY and MAC both need to be EEE capable */
 870         if (!dev->phydev || !dp->pl)
 871                 return -ENODEV;
 872
 873         if (!ds->ops->get_mac_eee)
 874                 return -EOPNOTSUPP;
 875
 876         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 877         if (ret)
 878                 return ret;
 879
 880         return phylink_ethtool_get_eee(dp->pl, e);
 881 }
 882
 883 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 884                                         struct ethtool_link_ksettings *cmd)
 885 {
 886         struct dsa_port *dp = dsa_slave_to_port(dev);
 887
 888         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 889 }
 890
 891 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 892                                         const struct ethtool_link_ksettings *cmd)
 893 {
 894         struct dsa_port *dp = dsa_slave_to_port(dev);
 895
 896         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 897 }
 898
 899 static void dsa_slave_get_pauseparam(struct net_device *dev,
 900                                      struct ethtool_pauseparam *pause)
 901 {
 902         struct dsa_port *dp = dsa_slave_to_port(dev);
 903
 904         phylink_ethtool_get_pauseparam(dp->pl, pause);
 905 }
 906
 907 static int dsa_slave_set_pauseparam(struct net_device *dev,
 908                                     struct ethtool_pauseparam *pause)
 909 {
 910         struct dsa_port *dp = dsa_slave_to_port(dev);
 911
 912         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 913 }
 914
 915 #ifdef CONFIG_NET_POLL_CONTROLLER
 916 static int dsa_slave_netpoll_setup(struct net_device *dev,
 917                                    struct netpoll_info *ni)
 918 {
 919         struct net_device *master = dsa_slave_to_master(dev);
 920         struct dsa_slave_priv *p = netdev_priv(dev);
 921         struct netpoll *netpoll;
 922         int err = 0;
 923
 924         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 925         if (!netpoll)
 926                 return -ENOMEM;
 927
 928         err = __netpoll_setup(netpoll, master);
 929         if (err) {
 930                 kfree(netpoll);
 931                 goto out;
 932         }
 933
 934         p->netpoll = netpoll;
 935 out:
 936         return err;
 937 }
 938
 939 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 940 {
 941         struct dsa_slave_priv *p = netdev_priv(dev);
 942         struct netpoll *netpoll = p->netpoll;
 943
 944         if (!netpoll)
 945                 return;
 946
 947         p->netpoll = NULL;
 948
 949         __netpoll_free(netpoll);
 950 }
 951
 952 static void dsa_slave_poll_controller(struct net_device *dev)
 953 {
 954 }
 955 #endif
 956
 957 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 958                                         char *name, size_t len)
 959 {
 960         struct dsa_port *dp = dsa_slave_to_port(dev);
 961
 962         /* For non-legacy ports, devlink is used and it takes
 963          * care of the name generation. This ndo implementation
 964          * should be removed with legacy support.
 965          */
 966         if (dp->ds->devlink)
 967                 return -EOPNOTSUPP;
 968
 969         if (snprintf(name, len, "p%d", dp->index) >= len)
 970                 return -EINVAL;
 971
 972         return 0;
 973 }
 974
 975 static struct dsa_mall_tc_entry *
 976 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 977 {
 978         struct dsa_slave_priv *p = netdev_priv(dev);
 979         struct dsa_mall_tc_entry *mall_tc_entry;
 980
 981         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 982                 if (mall_tc_entry->cookie == cookie)
 983                         return mall_tc_entry;
 984
 985         return NULL;
 986 }
 987
 988 static int
 989 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 990                                   struct tc_cls_matchall_offload *cls,
 991                                   bool ingress)
 992 {
 993         struct dsa_port *dp = dsa_slave_to_port(dev);
 994         struct dsa_slave_priv *p = netdev_priv(dev);
 995         struct dsa_mall_mirror_tc_entry *mirror;
 996         struct dsa_mall_tc_entry *mall_tc_entry;
 997         struct dsa_switch *ds = dp->ds;
 998         struct flow_action_entry *act;
 999         struct dsa_port *to_dp;
1000         int err;
1001
1002         if (!ds->ops->port_mirror_add)
1003                 return -EOPNOTSUPP;
1004
1005         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1006                                               cls->common.extack))
1007                 return -EOPNOTSUPP;
1008
1009         act = &cls->rule->action.entries[0];
1010
1011         if (!act->dev)
1012                 return -EINVAL;
1013
1014         if (!dsa_slave_dev_check(act->dev))
1015                 return -EOPNOTSUPP;
1016
1017         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1018         if (!mall_tc_entry)
1019                 return -ENOMEM;
1020
1021         mall_tc_entry->cookie = cls->cookie;
1022         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1023         mirror = &mall_tc_entry->mirror;
1024
1025         to_dp = dsa_slave_to_port(act->dev);
1026
1027         mirror->to_local_port = to_dp->index;
1028         mirror->ingress = ingress;
1029
1030         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
1031         if (err) {
1032                 kfree(mall_tc_entry);
1033                 return err;
1034         }
1035
1036         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1037
1038         return err;
1039 }
1040
1041 static int
1042 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1043                                   struct tc_cls_matchall_offload *cls,
1044                                   bool ingress)
1045 {
1046         struct netlink_ext_ack *extack = cls->common.extack;
1047         struct dsa_port *dp = dsa_slave_to_port(dev);
1048         struct dsa_slave_priv *p = netdev_priv(dev);
1049         struct dsa_mall_policer_tc_entry *policer;
1050         struct dsa_mall_tc_entry *mall_tc_entry;
1051         struct dsa_switch *ds = dp->ds;
1052         struct flow_action_entry *act;
1053         int err;
1054
1055         if (!ds->ops->port_policer_add) {
1056                 NL_SET_ERR_MSG_MOD(extack,
1057                                    "Policing offload not implemented");
1058                 return -EOPNOTSUPP;
1059         }
1060
1061         if (!ingress) {
1062                 NL_SET_ERR_MSG_MOD(extack,
1063                                    "Only supported on ingress qdisc");
1064                 return -EOPNOTSUPP;
1065         }
1066
1067         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1068                                               cls->common.extack))
1069                 return -EOPNOTSUPP;
1070
1071         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1072                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1073                         NL_SET_ERR_MSG_MOD(extack,
1074                                            "Only one port policer allowed");
1075                         return -EEXIST;
1076                 }
1077         }
1078
1079         act = &cls->rule->action.entries[0];
1080
1081         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1082         if (!mall_tc_entry)
1083                 return -ENOMEM;
1084
1085         mall_tc_entry->cookie = cls->cookie;
1086         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1087         policer = &mall_tc_entry->policer;
1088         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1089         policer->burst = act->police.burst;
1090
1091         err = ds->ops->port_policer_add(ds, dp->index, policer);
1092         if (err) {
1093                 kfree(mall_tc_entry);
1094                 return err;
1095         }
1096
1097         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1098
1099         return err;
1100 }
1101
1102 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1103                                       struct tc_cls_matchall_offload *cls,
1104                                       bool ingress)
1105 {
1106         int err = -EOPNOTSUPP;
1107
1108         if (cls->common.protocol == htons(ETH_P_ALL) &&
1109             flow_offload_has_one_action(&cls->rule->action) &&
1110             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1111                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1112         else if (flow_offload_has_one_action(&cls->rule->action) &&
1113                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1114                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1115
1116         return err;
1117 }
1118
1119 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1120                                        struct tc_cls_matchall_offload *cls)
1121 {
1122         struct dsa_port *dp = dsa_slave_to_port(dev);
1123         struct dsa_mall_tc_entry *mall_tc_entry;
1124         struct dsa_switch *ds = dp->ds;
1125
1126         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1127         if (!mall_tc_entry)
1128                 return;
1129
1130         list_del(&mall_tc_entry->list);
1131
1132         switch (mall_tc_entry->type) {
1133         case DSA_PORT_MALL_MIRROR:
1134                 if (ds->ops->port_mirror_del)
1135                         ds->ops->port_mirror_del(ds, dp->index,
1136                                                  &mall_tc_entry->mirror);
1137                 break;
1138         case DSA_PORT_MALL_POLICER:
1139                 if (ds->ops->port_policer_del)
1140                         ds->ops->port_policer_del(ds, dp->index);
1141                 break;
1142         default:
1143                 WARN_ON(1);
1144         }
1145
1146         kfree(mall_tc_entry);
1147 }
1148
1149 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1150                                            struct tc_cls_matchall_offload *cls,
1151                                            bool ingress)
1152 {
1153         if (cls->common.chain_index)
1154                 return -EOPNOTSUPP;
1155
1156         switch (cls->command) {
1157         case TC_CLSMATCHALL_REPLACE:
1158                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1159         case TC_CLSMATCHALL_DESTROY:
1160                 dsa_slave_del_cls_matchall(dev, cls);
1161                 return 0;
1162         default:
1163                 return -EOPNOTSUPP;
1164         }
1165 }
1166
1167 static int dsa_slave_add_cls_flower(struct net_device *dev,
1168                                     struct flow_cls_offload *cls,
1169                                     bool ingress)
1170 {
1171         struct dsa_port *dp = dsa_slave_to_port(dev);
1172         struct dsa_switch *ds = dp->ds;
1173         int port = dp->index;
1174
1175         if (!ds->ops->cls_flower_add)
1176                 return -EOPNOTSUPP;
1177
1178         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1179 }
1180
1181 static int dsa_slave_del_cls_flower(struct net_device *dev,
1182                                     struct flow_cls_offload *cls,
1183                                     bool ingress)
1184 {
1185         struct dsa_port *dp = dsa_slave_to_port(dev);
1186         struct dsa_switch *ds = dp->ds;
1187         int port = dp->index;
1188
1189         if (!ds->ops->cls_flower_del)
1190                 return -EOPNOTSUPP;
1191
1192         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1193 }
1194
1195 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1196                                       struct flow_cls_offload *cls,
1197                                       bool ingress)
1198 {
1199         struct dsa_port *dp = dsa_slave_to_port(dev);
1200         struct dsa_switch *ds = dp->ds;
1201         int port = dp->index;
1202
1203         if (!ds->ops->cls_flower_stats)
1204                 return -EOPNOTSUPP;
1205
1206         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1207 }
1208
1209 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1210                                          struct flow_cls_offload *cls,
1211                                          bool ingress)
1212 {
1213         switch (cls->command) {
1214         case FLOW_CLS_REPLACE:
1215                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1216         case FLOW_CLS_DESTROY:
1217                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1218         case FLOW_CLS_STATS:
1219                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1220         default:
1221                 return -EOPNOTSUPP;
1222         }
1223 }
1224
1225 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1226                                        void *cb_priv, bool ingress)
1227 {
1228         struct net_device *dev = cb_priv;
1229
1230         if (!tc_can_offload(dev))
1231                 return -EOPNOTSUPP;
1232
1233         switch (type) {
1234         case TC_SETUP_CLSMATCHALL:
1235                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1236         case TC_SETUP_CLSFLOWER:
1237                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1238         default:
1239                 return -EOPNOTSUPP;
1240         }
1241 }
1242
1243 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1244                                           void *type_data, void *cb_priv)
1245 {
1246         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1247 }
1248
1249 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1250                                           void *type_data, void *cb_priv)
1251 {
1252         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1253 }
1254
1255 static LIST_HEAD(dsa_slave_block_cb_list);
1256
1257 static int dsa_slave_setup_tc_block(struct net_device *dev,
1258                                     struct flow_block_offload *f)
1259 {
1260         struct flow_block_cb *block_cb;
1261         flow_setup_cb_t *cb;
1262
1263         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1264                 cb = dsa_slave_setup_tc_block_cb_ig;
1265         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1266                 cb = dsa_slave_setup_tc_block_cb_eg;
1267         else
1268                 return -EOPNOTSUPP;
1269
1270         f->driver_block_list = &dsa_slave_block_cb_list;
1271
1272         switch (f->command) {
1273         case FLOW_BLOCK_BIND:
1274                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1275                         return -EBUSY;
1276
1277                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1278                 if (IS_ERR(block_cb))
1279                         return PTR_ERR(block_cb);
1280
1281                 flow_block_cb_add(block_cb, f);
1282                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1283                 return 0;
1284         case FLOW_BLOCK_UNBIND:
1285                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1286                 if (!block_cb)
1287                         return -ENOENT;
1288
1289                 flow_block_cb_remove(block_cb, f);
1290                 list_del(&block_cb->driver_list);
1291                 return 0;
1292         default:
1293                 return -EOPNOTSUPP;
1294         }
1295 }
1296
1297 static int dsa_slave_setup_ft_block(struct dsa_switch *ds, int port,
1298                                     void *type_data)
1299 {
1300         struct dsa_port *cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1301         struct net_device *master = cpu_dp->master;
1302
1303         if (!master->netdev_ops->ndo_setup_tc)
1304                 return -EOPNOTSUPP;
1305
1306         return master->netdev_ops->ndo_setup_tc(master, TC_SETUP_FT, type_data);
1307 }
1308
1309 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1310                               void *type_data)
1311 {
1312         struct dsa_port *dp = dsa_slave_to_port(dev);
1313         struct dsa_switch *ds = dp->ds;
1314
1315         switch (type) {
1316         case TC_SETUP_BLOCK:
1317                 return dsa_slave_setup_tc_block(dev, type_data);
1318         case TC_SETUP_FT:
1319                 return dsa_slave_setup_ft_block(ds, dp->index, type_data);
1320         default:
1321                 break;
1322         }
1323
1324         if (!ds->ops->port_setup_tc)
1325                 return -EOPNOTSUPP;
1326
1327         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1328 }
1329
1330 static int dsa_slave_get_rxnfc(struct net_device *dev,
1331                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1332 {
1333         struct dsa_port *dp = dsa_slave_to_port(dev);
1334         struct dsa_switch *ds = dp->ds;
1335
1336         if (!ds->ops->get_rxnfc)
1337                 return -EOPNOTSUPP;
1338
1339         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1340 }
1341
1342 static int dsa_slave_set_rxnfc(struct net_device *dev,
1343                                struct ethtool_rxnfc *nfc)
1344 {
1345         struct dsa_port *dp = dsa_slave_to_port(dev);
1346         struct dsa_switch *ds = dp->ds;
1347
1348         if (!ds->ops->set_rxnfc)
1349                 return -EOPNOTSUPP;
1350
1351         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1352 }
1353
1354 static int dsa_slave_get_ts_info(struct net_device *dev,
1355                                  struct ethtool_ts_info *ts)
1356 {
1357         struct dsa_slave_priv *p = netdev_priv(dev);
1358         struct dsa_switch *ds = p->dp->ds;
1359
1360         if (!ds->ops->get_ts_info)
1361                 return -EOPNOTSUPP;
1362
1363         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1364 }
1365
1366 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1367                                      u16 vid)
1368 {
1369         struct net_device *master = dsa_slave_to_master(dev);
1370         struct dsa_port *dp = dsa_slave_to_port(dev);
1371         struct switchdev_obj_port_vlan vlan = {
1372                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1373                 .vid = vid,
1374                 /* This API only allows programming tagged, non-PVID VIDs */
1375                 .flags = 0,
1376         };
1377         struct netlink_ext_ack extack = {0};
1378         int ret;
1379
1380         /* User port... */
1381         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1382         if (ret) {
1383                 if (extack._msg)
1384                         netdev_err(dev, "%s\n", extack._msg);
1385                 return ret;
1386         }
1387
1388         /* And CPU port... */
1389         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &extack);
1390         if (ret) {
1391                 if (extack._msg)
1392                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1393                                    extack._msg);
1394                 return ret;
1395         }
1396
1397         return vlan_vid_add(master, proto, vid);
1398 }
1399
1400 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1401                                       u16 vid)
1402 {
1403         struct net_device *master = dsa_slave_to_master(dev);
1404         struct dsa_port *dp = dsa_slave_to_port(dev);
1405         struct switchdev_obj_port_vlan vlan = {
1406                 .vid = vid,
1407                 /* This API only allows programming tagged, non-PVID VIDs */
1408                 .flags = 0,
1409         };
1410         int err;
1411
1412         /* Do not deprogram the CPU port as it may be shared with other user
1413          * ports which can be members of this VLAN as well.
1414          */
1415         err = dsa_port_vlan_del(dp, &vlan);
1416         if (err)
1417                 return err;
1418
1419         vlan_vid_del(master, proto, vid);
1420
1421         return 0;
1422 }
1423
1424 struct dsa_hw_port {
1425         struct list_head list;
1426         struct net_device *dev;
1427         int old_mtu;
1428 };
1429
1430 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1431 {
1432         const struct dsa_hw_port *p;
1433         int err;
1434
1435         list_for_each_entry(p, hw_port_list, list) {
1436                 if (p->dev->mtu == mtu)
1437                         continue;
1438
1439                 err = dev_set_mtu(p->dev, mtu);
1440                 if (err)
1441                         goto rollback;
1442         }
1443
1444         return 0;
1445
1446 rollback:
1447         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1448                 if (p->dev->mtu == p->old_mtu)
1449                         continue;
1450
1451                 if (dev_set_mtu(p->dev, p->old_mtu))
1452                         netdev_err(p->dev, "Failed to restore MTU\n");
1453         }
1454
1455         return err;
1456 }
1457
1458 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1459 {
1460         struct dsa_hw_port *p, *n;
1461
1462         list_for_each_entry_safe(p, n, hw_port_list, list)
1463                 kfree(p);
1464 }
1465
1466 /* Make the hardware datapath to/from @dev limited to a common MTU */
1467 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1468 {
1469         struct list_head hw_port_list;
1470         struct dsa_switch_tree *dst;
1471         int min_mtu = ETH_MAX_MTU;
1472         struct dsa_port *other_dp;
1473         int err;
1474
1475         if (!dp->ds->mtu_enforcement_ingress)
1476                 return;
1477
1478         if (!dp->bridge_dev)
1479                 return;
1480
1481         INIT_LIST_HEAD(&hw_port_list);
1482
1483         /* Populate the list of ports that are part of the same bridge
1484          * as the newly added/modified port
1485          */
1486         list_for_each_entry(dst, &dsa_tree_list, list) {
1487                 list_for_each_entry(other_dp, &dst->ports, list) {
1488                         struct dsa_hw_port *hw_port;
1489                         struct net_device *slave;
1490
1491                         if (other_dp->type != DSA_PORT_TYPE_USER)
1492                                 continue;
1493
1494                         if (other_dp->bridge_dev != dp->bridge_dev)
1495                                 continue;
1496
1497                         if (!other_dp->ds->mtu_enforcement_ingress)
1498                                 continue;
1499
1500                         slave = other_dp->slave;
1501
1502                         if (min_mtu > slave->mtu)
1503                                 min_mtu = slave->mtu;
1504
1505                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1506                         if (!hw_port)
1507                                 goto out;
1508
1509                         hw_port->dev = slave;
1510                         hw_port->old_mtu = slave->mtu;
1511
1512                         list_add(&hw_port->list, &hw_port_list);
1513                 }
1514         }
1515
1516         /* Attempt to configure the entire hardware bridge to the newly added
1517          * interface's MTU first, regardless of whether the intention of the
1518          * user was to raise or lower it.
1519          */
1520         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1521         if (!err)
1522                 goto out;
1523
1524         /* Clearly that didn't work out so well, so just set the minimum MTU on
1525          * all hardware bridge ports now. If this fails too, then all ports will
1526          * still have their old MTU rolled back anyway.
1527          */
1528         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1529
1530 out:
1531         dsa_hw_port_list_free(&hw_port_list);
1532 }
1533
1534 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1535 {
1536         struct net_device *master = dsa_slave_to_master(dev);
1537         struct dsa_port *dp = dsa_slave_to_port(dev);
1538         struct dsa_slave_priv *p = netdev_priv(dev);
1539         struct dsa_switch *ds = p->dp->ds;
1540         struct dsa_port *dp_iter;
1541         struct dsa_port *cpu_dp;
1542         int port = p->dp->index;
1543         int largest_mtu = 0;
1544         int new_master_mtu;
1545         int old_master_mtu;
1546         int mtu_limit;
1547         int cpu_mtu;
1548         int err;
1549
1550         if (!ds->ops->port_change_mtu)
1551                 return -EOPNOTSUPP;
1552
1553         list_for_each_entry(dp_iter, &ds->dst->ports, list) {
1554                 int slave_mtu;
1555
1556                 if (!dsa_port_is_user(dp_iter))
1557                         continue;
1558
1559                 /* During probe, this function will be called for each slave
1560                  * device, while not all of them have been allocated. That's
1561                  * ok, it doesn't change what the maximum is, so ignore it.
1562                  */
1563                 if (!dp_iter->slave)
1564                         continue;
1565
1566                 /* Pretend that we already applied the setting, which we
1567                  * actually haven't (still haven't done all integrity checks)
1568                  */
1569                 if (dp_iter == dp)
1570                         slave_mtu = new_mtu;
1571                 else
1572                         slave_mtu = dp_iter->slave->mtu;
1573
1574                 if (largest_mtu < slave_mtu)
1575                         largest_mtu = slave_mtu;
1576         }
1577
1578         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1579
1580         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1581         old_master_mtu = master->mtu;
1582         new_master_mtu = largest_mtu + dsa_tag_protocol_overhead(cpu_dp->tag_ops);
1583         if (new_master_mtu > mtu_limit)
1584                 return -ERANGE;
1585
1586         /* If the master MTU isn't over limit, there's no need to check the CPU
1587          * MTU, since that surely isn't either.
1588          */
1589         cpu_mtu = largest_mtu;
1590
1591         /* Start applying stuff */
1592         if (new_master_mtu != old_master_mtu) {
1593                 err = dev_set_mtu(master, new_master_mtu);
1594                 if (err < 0)
1595                         goto out_master_failed;
1596
1597                 /* We only need to propagate the MTU of the CPU port to
1598                  * upstream switches, so create a non-targeted notifier which
1599                  * updates all switches.
1600                  */
1601                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, false);
1602                 if (err)
1603                         goto out_cpu_failed;
1604         }
1605
1606         err = dsa_port_mtu_change(dp, new_mtu, true);
1607         if (err)
1608                 goto out_port_failed;
1609
1610         dev->mtu = new_mtu;
1611
1612         dsa_bridge_mtu_normalization(dp);
1613
1614         return 0;
1615
1616 out_port_failed:
1617         if (new_master_mtu != old_master_mtu)
1618                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1619                                     dsa_tag_protocol_overhead(cpu_dp->tag_ops),
1620                                     false);
1621 out_cpu_failed:
1622         if (new_master_mtu != old_master_mtu)
1623                 dev_set_mtu(master, old_master_mtu);
1624 out_master_failed:
1625         return err;
1626 }
1627
1628 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1629         .get_drvinfo            = dsa_slave_get_drvinfo,
1630         .get_regs_len           = dsa_slave_get_regs_len,
1631         .get_regs               = dsa_slave_get_regs,
1632         .nway_reset             = dsa_slave_nway_reset,
1633         .get_link               = ethtool_op_get_link,
1634         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1635         .get_eeprom             = dsa_slave_get_eeprom,
1636         .set_eeprom             = dsa_slave_set_eeprom,
1637         .get_strings            = dsa_slave_get_strings,
1638         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1639         .get_sset_count         = dsa_slave_get_sset_count,
1640         .set_wol                = dsa_slave_set_wol,
1641         .get_wol                = dsa_slave_get_wol,
1642         .set_eee                = dsa_slave_set_eee,
1643         .get_eee                = dsa_slave_get_eee,
1644         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1645         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1646         .get_pauseparam         = dsa_slave_get_pauseparam,
1647         .set_pauseparam         = dsa_slave_set_pauseparam,
1648         .get_rxnfc              = dsa_slave_get_rxnfc,
1649         .set_rxnfc              = dsa_slave_set_rxnfc,
1650         .get_ts_info            = dsa_slave_get_ts_info,
1651         .self_test              = dsa_slave_net_selftest,
1652 };
1653
1654 /* legacy way, bypassing the bridge *****************************************/
1655 static int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1656                               struct net_device *dev,
1657                               const unsigned char *addr, u16 vid,
1658                               u16 flags,
1659                               struct netlink_ext_ack *extack)
1660 {
1661         struct dsa_port *dp = dsa_slave_to_port(dev);
1662
1663         return dsa_port_fdb_add(dp, addr, vid);
1664 }
1665
1666 static int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1667                               struct net_device *dev,
1668                               const unsigned char *addr, u16 vid)
1669 {
1670         struct dsa_port *dp = dsa_slave_to_port(dev);
1671
1672         return dsa_port_fdb_del(dp, addr, vid);
1673 }
1674
1675 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1676 {
1677         struct dsa_port *dp = dsa_slave_to_port(dev);
1678
1679         return dp->ds->devlink ? &dp->devlink_port : NULL;
1680 }
1681
1682 static void dsa_slave_get_stats64(struct net_device *dev,
1683                                   struct rtnl_link_stats64 *s)
1684 {
1685         struct dsa_port *dp = dsa_slave_to_port(dev);
1686         struct dsa_switch *ds = dp->ds;
1687
1688         if (ds->ops->get_stats64)
1689                 ds->ops->get_stats64(ds, dp->index, s);
1690         else
1691                 dev_get_tstats64(dev, s);
1692 }
1693
1694 static int dsa_slave_fill_forward_path(struct net_device_path_ctx *ctx,
1695                                        struct net_device_path *path)
1696 {
1697         struct dsa_port *dp = dsa_slave_to_port(ctx->dev);
1698         struct dsa_port *cpu_dp = dp->cpu_dp;
1699
1700         path->dev = ctx->dev;
1701         path->type = DEV_PATH_DSA;
1702         path->dsa.proto = cpu_dp->tag_ops->proto;
1703         path->dsa.port = dp->index;
1704         ctx->dev = cpu_dp->master;
1705
1706         return 0;
1707 }
1708
1709 static const struct net_device_ops dsa_slave_netdev_ops = {
1710         .ndo_open               = dsa_slave_open,
1711         .ndo_stop               = dsa_slave_close,
1712         .ndo_start_xmit         = dsa_slave_xmit,
1713         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1714         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1715         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1716         .ndo_fdb_add            = dsa_legacy_fdb_add,
1717         .ndo_fdb_del            = dsa_legacy_fdb_del,
1718         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1719         .ndo_do_ioctl           = dsa_slave_ioctl,
1720         .ndo_get_iflink         = dsa_slave_get_iflink,
1721 #ifdef CONFIG_NET_POLL_CONTROLLER
1722         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1723         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1724         .ndo_poll_controller    = dsa_slave_poll_controller,
1725 #endif
1726         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1727         .ndo_setup_tc           = dsa_slave_setup_tc,
1728         .ndo_get_stats64        = dsa_slave_get_stats64,
1729         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1730         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1731         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1732         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1733         .ndo_change_mtu         = dsa_slave_change_mtu,
1734         .ndo_fill_forward_path  = dsa_slave_fill_forward_path,
1735 };
1736
1737 static struct device_type dsa_type = {
1738         .name   = "dsa",
1739 };
1740
1741 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1742 {
1743         const struct dsa_port *dp = dsa_to_port(ds, port);
1744
1745         if (dp->pl)
1746                 phylink_mac_change(dp->pl, up);
1747 }
1748 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1749
1750 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1751                                           struct phylink_link_state *state)
1752 {
1753         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1754         struct dsa_switch *ds = dp->ds;
1755
1756         /* No need to check that this operation is valid, the callback would
1757          * not be called if it was not.
1758          */
1759         ds->ops->phylink_fixed_state(ds, dp->index, state);
1760 }
1761
1762 /* slave device setup *******************************************************/
1763 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr,
1764                                  u32 flags)
1765 {
1766         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1767         struct dsa_switch *ds = dp->ds;
1768
1769         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1770         if (!slave_dev->phydev) {
1771                 netdev_err(slave_dev, "no phy at %d\n", addr);
1772                 return -ENODEV;
1773         }
1774
1775         slave_dev->phydev->dev_flags |= flags;
1776
1777         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1778 }
1779
1780 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1781 {
1782         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1783         struct device_node *port_dn = dp->dn;
1784         struct dsa_switch *ds = dp->ds;
1785         phy_interface_t mode;
1786         u32 phy_flags = 0;
1787         int ret;
1788
1789         ret = of_get_phy_mode(port_dn, &mode);
1790         if (ret)
1791                 mode = PHY_INTERFACE_MODE_NA;
1792
1793         dp->pl_config.dev = &slave_dev->dev;
1794         dp->pl_config.type = PHYLINK_NETDEV;
1795
1796         /* The get_fixed_state callback takes precedence over polling the
1797          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1798          * this if the switch provides such a callback.
1799          */
1800         if (ds->ops->phylink_fixed_state) {
1801                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1802                 dp->pl_config.poll_fixed_state = true;
1803         }
1804
1805         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1806                                 &dsa_port_phylink_mac_ops);
1807         if (IS_ERR(dp->pl)) {
1808                 netdev_err(slave_dev,
1809                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1810                 return PTR_ERR(dp->pl);
1811         }
1812
1813         if (ds->ops->get_phy_flags)
1814                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1815
1816         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1817         if (ret == -ENODEV && ds->slave_mii_bus) {
1818                 /* We could not connect to a designated PHY or SFP, so try to
1819                  * use the switch internal MDIO bus instead
1820                  */
1821                 ret = dsa_slave_phy_connect(slave_dev, dp->index, phy_flags);
1822                 if (ret) {
1823                         netdev_err(slave_dev,
1824                                    "failed to connect to port %d: %d\n",
1825                                    dp->index, ret);
1826                         phylink_destroy(dp->pl);
1827                         return ret;
1828                 }
1829         }
1830
1831         return ret;
1832 }
1833
1834 void dsa_slave_setup_tagger(struct net_device *slave)
1835 {
1836         struct dsa_port *dp = dsa_slave_to_port(slave);
1837         struct dsa_slave_priv *p = netdev_priv(slave);
1838         const struct dsa_port *cpu_dp = dp->cpu_dp;
1839         struct net_device *master = cpu_dp->master;
1840
1841         slave->needed_headroom = cpu_dp->tag_ops->needed_headroom;
1842         slave->needed_tailroom = cpu_dp->tag_ops->needed_tailroom;
1843         /* Try to save one extra realloc later in the TX path (in the master)
1844          * by also inheriting the master's needed headroom and tailroom.
1845          * The 8021q driver also does this.
1846          */
1847         slave->needed_headroom += master->needed_headroom;
1848         slave->needed_tailroom += master->needed_tailroom;
1849
1850         p->xmit = cpu_dp->tag_ops->xmit;
1851 }
1852
1853 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1854 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1855                                             struct netdev_queue *txq,
1856                                             void *_unused)
1857 {
1858         lockdep_set_class(&txq->_xmit_lock,
1859                           &dsa_slave_netdev_xmit_lock_key);
1860 }
1861
1862 int dsa_slave_suspend(struct net_device *slave_dev)
1863 {
1864         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1865
1866         if (!netif_running(slave_dev))
1867                 return 0;
1868
1869         netif_device_detach(slave_dev);
1870
1871         rtnl_lock();
1872         phylink_stop(dp->pl);
1873         rtnl_unlock();
1874
1875         return 0;
1876 }
1877
1878 int dsa_slave_resume(struct net_device *slave_dev)
1879 {
1880         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1881
1882         if (!netif_running(slave_dev))
1883                 return 0;
1884
1885         netif_device_attach(slave_dev);
1886
1887         rtnl_lock();
1888         phylink_start(dp->pl);
1889         rtnl_unlock();
1890
1891         return 0;
1892 }
1893
1894 int dsa_slave_create(struct dsa_port *port)
1895 {
1896         const struct dsa_port *cpu_dp = port->cpu_dp;
1897         struct net_device *master = cpu_dp->master;
1898         struct dsa_switch *ds = port->ds;
1899         const char *name = port->name;
1900         struct net_device *slave_dev;
1901         struct dsa_slave_priv *p;
1902         int ret;
1903
1904         if (!ds->num_tx_queues)
1905                 ds->num_tx_queues = 1;
1906
1907         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1908                                      NET_NAME_UNKNOWN, ether_setup,
1909                                      ds->num_tx_queues, 1);
1910         if (slave_dev == NULL)
1911                 return -ENOMEM;
1912
1913         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1914         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1915                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1916         slave_dev->hw_features |= NETIF_F_HW_TC;
1917         slave_dev->features |= NETIF_F_LLTX;
1918         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1919         if (!is_zero_ether_addr(port->mac))
1920                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1921         else
1922                 eth_hw_addr_inherit(slave_dev, master);
1923         slave_dev->priv_flags |= IFF_NO_QUEUE;
1924         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1925         if (ds->ops->port_max_mtu)
1926                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1927         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1928
1929         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1930                                  NULL);
1931
1932         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1933         slave_dev->dev.of_node = port->dn;
1934         slave_dev->vlan_features = master->vlan_features;
1935
1936         p = netdev_priv(slave_dev);
1937         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1938         if (!slave_dev->tstats) {
1939                 free_netdev(slave_dev);
1940                 return -ENOMEM;
1941         }
1942
1943         ret = gro_cells_init(&p->gcells, slave_dev);
1944         if (ret)
1945                 goto out_free;
1946
1947         p->dp = port;
1948         INIT_LIST_HEAD(&p->mall_tc_list);
1949         port->slave = slave_dev;
1950         dsa_slave_setup_tagger(slave_dev);
1951
1952         rtnl_lock();
1953         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1954         rtnl_unlock();
1955         if (ret && ret != -EOPNOTSUPP)
1956                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1957                          ret, ETH_DATA_LEN, port->index);
1958
1959         netif_carrier_off(slave_dev);
1960
1961         ret = dsa_slave_phy_setup(slave_dev);
1962         if (ret) {
1963                 netdev_err(slave_dev,
1964                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1965                            ret, ds->dst->index, ds->index, port->index);
1966                 goto out_gcells;
1967         }
1968
1969         rtnl_lock();
1970
1971         ret = register_netdevice(slave_dev);
1972         if (ret) {
1973                 netdev_err(master, "error %d registering interface %s\n",
1974                            ret, slave_dev->name);
1975                 rtnl_unlock();
1976                 goto out_phy;
1977         }
1978
1979         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1980
1981         rtnl_unlock();
1982
1983         if (ret)
1984                 goto out_unregister;
1985
1986         return 0;
1987
1988 out_unregister:
1989         unregister_netdev(slave_dev);
1990 out_phy:
1991         rtnl_lock();
1992         phylink_disconnect_phy(p->dp->pl);
1993         rtnl_unlock();
1994         phylink_destroy(p->dp->pl);
1995 out_gcells:
1996         gro_cells_destroy(&p->gcells);
1997 out_free:
1998         free_percpu(slave_dev->tstats);
1999         free_netdev(slave_dev);
2000         port->slave = NULL;
2001         return ret;
2002 }
2003
2004 void dsa_slave_destroy(struct net_device *slave_dev)
2005 {
2006         struct net_device *master = dsa_slave_to_master(slave_dev);
2007         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2008         struct dsa_slave_priv *p = netdev_priv(slave_dev);
2009
2010         netif_carrier_off(slave_dev);
2011         rtnl_lock();
2012         netdev_upper_dev_unlink(master, slave_dev);
2013         unregister_netdevice(slave_dev);
2014         phylink_disconnect_phy(dp->pl);
2015         rtnl_unlock();
2016
2017         phylink_destroy(dp->pl);
2018         gro_cells_destroy(&p->gcells);
2019         free_percpu(slave_dev->tstats);
2020         free_netdev(slave_dev);
2021 }
2022
2023 bool dsa_slave_dev_check(const struct net_device *dev)
2024 {
2025         return dev->netdev_ops == &dsa_slave_netdev_ops;
2026 }
2027 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
2028
2029 static int dsa_slave_changeupper(struct net_device *dev,
2030                                  struct netdev_notifier_changeupper_info *info)
2031 {
2032         struct dsa_port *dp = dsa_slave_to_port(dev);
2033         struct netlink_ext_ack *extack;
2034         int err = NOTIFY_DONE;
2035
2036         extack = netdev_notifier_info_to_extack(&info->info);
2037
2038         if (netif_is_bridge_master(info->upper_dev)) {
2039                 if (info->linking) {
2040                         err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2041                         if (!err)
2042                                 dsa_bridge_mtu_normalization(dp);
2043                         err = notifier_from_errno(err);
2044                 } else {
2045                         dsa_port_bridge_leave(dp, info->upper_dev);
2046                         err = NOTIFY_OK;
2047                 }
2048         } else if (netif_is_lag_master(info->upper_dev)) {
2049                 if (info->linking) {
2050                         err = dsa_port_lag_join(dp, info->upper_dev,
2051                                                 info->upper_info, extack);
2052                         if (err == -EOPNOTSUPP) {
2053                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2054                                                    "Offloading not supported");
2055                                 err = 0;
2056                         }
2057                         err = notifier_from_errno(err);
2058                 } else {
2059                         dsa_port_lag_leave(dp, info->upper_dev);
2060                         err = NOTIFY_OK;
2061                 }
2062         } else if (is_hsr_master(info->upper_dev)) {
2063                 if (info->linking) {
2064                         err = dsa_port_hsr_join(dp, info->upper_dev);
2065                         if (err == -EOPNOTSUPP) {
2066                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2067                                                    "Offloading not supported");
2068                                 err = 0;
2069                         }
2070                         err = notifier_from_errno(err);
2071                 } else {
2072                         dsa_port_hsr_leave(dp, info->upper_dev);
2073                         err = NOTIFY_OK;
2074                 }
2075         }
2076
2077         return err;
2078 }
2079
2080 static int
2081 dsa_slave_lag_changeupper(struct net_device *dev,
2082                           struct netdev_notifier_changeupper_info *info)
2083 {
2084         struct net_device *lower;
2085         struct list_head *iter;
2086         int err = NOTIFY_DONE;
2087         struct dsa_port *dp;
2088
2089         netdev_for_each_lower_dev(dev, lower, iter) {
2090                 if (!dsa_slave_dev_check(lower))
2091                         continue;
2092
2093                 dp = dsa_slave_to_port(lower);
2094                 if (!dp->lag_dev)
2095                         /* Software LAG */
2096                         continue;
2097
2098                 err = dsa_slave_changeupper(lower, info);
2099                 if (notifier_to_errno(err))
2100                         break;
2101         }
2102
2103         return err;
2104 }
2105
2106 static int
2107 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2108                                  struct netdev_notifier_changeupper_info *info)
2109 {
2110         struct netlink_ext_ack *ext_ack;
2111         struct net_device *slave;
2112         struct dsa_port *dp;
2113
2114         ext_ack = netdev_notifier_info_to_extack(&info->info);
2115
2116         if (!is_vlan_dev(dev))
2117                 return NOTIFY_DONE;
2118
2119         slave = vlan_dev_real_dev(dev);
2120         if (!dsa_slave_dev_check(slave))
2121                 return NOTIFY_DONE;
2122
2123         dp = dsa_slave_to_port(slave);
2124         if (!dp->bridge_dev)
2125                 return NOTIFY_DONE;
2126
2127         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2128         if (br_vlan_enabled(dp->bridge_dev) &&
2129             netif_is_bridge_master(info->upper_dev) && info->linking) {
2130                 NL_SET_ERR_MSG_MOD(ext_ack,
2131                                    "Cannot enslave VLAN device into VLAN aware bridge");
2132                 return notifier_from_errno(-EINVAL);
2133         }
2134
2135         return NOTIFY_DONE;
2136 }
2137
2138 static int
2139 dsa_slave_check_8021q_upper(struct net_device *dev,
2140                             struct netdev_notifier_changeupper_info *info)
2141 {
2142         struct dsa_port *dp = dsa_slave_to_port(dev);
2143         struct net_device *br = dp->bridge_dev;
2144         struct bridge_vlan_info br_info;
2145         struct netlink_ext_ack *extack;
2146         int err = NOTIFY_DONE;
2147         u16 vid;
2148
2149         if (!br || !br_vlan_enabled(br))
2150                 return NOTIFY_DONE;
2151
2152         extack = netdev_notifier_info_to_extack(&info->info);
2153         vid = vlan_dev_vlan_id(info->upper_dev);
2154
2155         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2156          * device, respectively the VID is not found, returning
2157          * 0 means success, which is a failure for us here.
2158          */
2159         err = br_vlan_get_info(br, vid, &br_info);
2160         if (err == 0) {
2161                 NL_SET_ERR_MSG_MOD(extack,
2162                                    "This VLAN is already configured by the bridge");
2163                 return notifier_from_errno(-EBUSY);
2164         }
2165
2166         return NOTIFY_DONE;
2167 }
2168
2169 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2170                                      unsigned long event, void *ptr)
2171 {
2172         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2173
2174         switch (event) {
2175         case NETDEV_PRECHANGEUPPER: {
2176                 struct netdev_notifier_changeupper_info *info = ptr;
2177                 struct dsa_switch *ds;
2178                 struct dsa_port *dp;
2179                 int err;
2180
2181                 if (!dsa_slave_dev_check(dev))
2182                         return dsa_prevent_bridging_8021q_upper(dev, ptr);
2183
2184                 dp = dsa_slave_to_port(dev);
2185                 ds = dp->ds;
2186
2187                 if (ds->ops->port_prechangeupper) {
2188                         err = ds->ops->port_prechangeupper(ds, dp->index, info);
2189                         if (err)
2190                                 return notifier_from_errno(err);
2191                 }
2192
2193                 if (is_vlan_dev(info->upper_dev))
2194                         return dsa_slave_check_8021q_upper(dev, ptr);
2195                 break;
2196         }
2197         case NETDEV_CHANGEUPPER:
2198                 if (dsa_slave_dev_check(dev))
2199                         return dsa_slave_changeupper(dev, ptr);
2200
2201                 if (netif_is_lag_master(dev))
2202                         return dsa_slave_lag_changeupper(dev, ptr);
2203
2204                 break;
2205         case NETDEV_CHANGELOWERSTATE: {
2206                 struct netdev_notifier_changelowerstate_info *info = ptr;
2207                 struct dsa_port *dp;
2208                 int err;
2209
2210                 if (!dsa_slave_dev_check(dev))
2211                         break;
2212
2213                 dp = dsa_slave_to_port(dev);
2214
2215                 err = dsa_port_lag_change(dp, info->lower_state_info);
2216                 return notifier_from_errno(err);
2217         }
2218         case NETDEV_GOING_DOWN: {
2219                 struct dsa_port *dp, *cpu_dp;
2220                 struct dsa_switch_tree *dst;
2221                 LIST_HEAD(close_list);
2222
2223                 if (!netdev_uses_dsa(dev))
2224                         return NOTIFY_DONE;
2225
2226                 cpu_dp = dev->dsa_ptr;
2227                 dst = cpu_dp->ds->dst;
2228
2229                 list_for_each_entry(dp, &dst->ports, list) {
2230                         if (!dsa_is_user_port(dp->ds, dp->index))
2231                                 continue;
2232
2233                         list_add(&dp->slave->close_list, &close_list);
2234                 }
2235
2236                 dev_close_many(&close_list, true);
2237
2238                 return NOTIFY_OK;
2239         }
2240         default:
2241                 break;
2242         }
2243
2244         return NOTIFY_DONE;
2245 }
2246
2247 static void
2248 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2249 {
2250         struct dsa_switch *ds = switchdev_work->ds;
2251         struct switchdev_notifier_fdb_info info;
2252         struct dsa_port *dp;
2253
2254         if (!dsa_is_user_port(ds, switchdev_work->port))
2255                 return;
2256
2257         info.addr = switchdev_work->addr;
2258         info.vid = switchdev_work->vid;
2259         info.offloaded = true;
2260         dp = dsa_to_port(ds, switchdev_work->port);
2261         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2262                                  dp->slave, &info.info, NULL);
2263 }
2264
2265 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2266 {
2267         struct dsa_switchdev_event_work *switchdev_work =
2268                 container_of(work, struct dsa_switchdev_event_work, work);
2269         struct dsa_switch *ds = switchdev_work->ds;
2270         struct dsa_port *dp;
2271         int err;
2272
2273         dp = dsa_to_port(ds, switchdev_work->port);
2274
2275         rtnl_lock();
2276         switch (switchdev_work->event) {
2277         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2278                 err = dsa_port_fdb_add(dp, switchdev_work->addr,
2279                                        switchdev_work->vid);
2280                 if (err) {
2281                         dev_err(ds->dev,
2282                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2283                                 dp->index, switchdev_work->addr,
2284                                 switchdev_work->vid, err);
2285                         break;
2286                 }
2287                 dsa_fdb_offload_notify(switchdev_work);
2288                 break;
2289
2290         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2291                 err = dsa_port_fdb_del(dp, switchdev_work->addr,
2292                                        switchdev_work->vid);
2293                 if (err) {
2294                         dev_err(ds->dev,
2295                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2296                                 dp->index, switchdev_work->addr,
2297                                 switchdev_work->vid, err);
2298                 }
2299
2300                 break;
2301         }
2302         rtnl_unlock();
2303
2304         kfree(switchdev_work);
2305         if (dsa_is_user_port(ds, dp->index))
2306                 dev_put(dp->slave);
2307 }
2308
2309 static int dsa_lower_dev_walk(struct net_device *lower_dev,
2310                               struct netdev_nested_priv *priv)
2311 {
2312         if (dsa_slave_dev_check(lower_dev)) {
2313                 priv->data = (void *)netdev_priv(lower_dev);
2314                 return 1;
2315         }
2316
2317         return 0;
2318 }
2319
2320 static struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev)
2321 {
2322         struct netdev_nested_priv priv = {
2323                 .data = NULL,
2324         };
2325
2326         netdev_walk_all_lower_dev_rcu(dev, dsa_lower_dev_walk, &priv);
2327
2328         return (struct dsa_slave_priv *)priv.data;
2329 }
2330
2331 /* Called under rcu_read_lock() */
2332 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2333                                      unsigned long event, void *ptr)
2334 {
2335         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2336         const struct switchdev_notifier_fdb_info *fdb_info;
2337         struct dsa_switchdev_event_work *switchdev_work;
2338         struct dsa_port *dp;
2339         int err;
2340
2341         switch (event) {
2342         case SWITCHDEV_PORT_ATTR_SET:
2343                 err = switchdev_handle_port_attr_set(dev, ptr,
2344                                                      dsa_slave_dev_check,
2345                                                      dsa_slave_port_attr_set);
2346                 return notifier_from_errno(err);
2347         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2348         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2349                 fdb_info = ptr;
2350
2351                 if (dsa_slave_dev_check(dev)) {
2352                         if (!fdb_info->added_by_user || fdb_info->is_local)
2353                                 return NOTIFY_OK;
2354
2355                         dp = dsa_slave_to_port(dev);
2356                 } else {
2357                         /* Snoop addresses learnt on foreign interfaces
2358                          * bridged with us, for switches that don't
2359                          * automatically learn SA from CPU-injected traffic
2360                          */
2361                         struct net_device *br_dev;
2362                         struct dsa_slave_priv *p;
2363
2364                         br_dev = netdev_master_upper_dev_get_rcu(dev);
2365                         if (!br_dev)
2366                                 return NOTIFY_DONE;
2367
2368                         if (!netif_is_bridge_master(br_dev))
2369                                 return NOTIFY_DONE;
2370
2371                         p = dsa_slave_dev_lower_find(br_dev);
2372                         if (!p)
2373                                 return NOTIFY_DONE;
2374
2375                         dp = p->dp->cpu_dp;
2376
2377                         if (!dp->ds->assisted_learning_on_cpu_port)
2378                                 return NOTIFY_DONE;
2379
2380                         /* When the bridge learns an address on an offloaded
2381                          * LAG we don't want to send traffic to the CPU, the
2382                          * other ports bridged with the LAG should be able to
2383                          * autonomously forward towards it.
2384                          */
2385                         if (dsa_tree_offloads_bridge_port(dp->ds->dst, dev))
2386                                 return NOTIFY_DONE;
2387                 }
2388
2389                 if (!dp->ds->ops->port_fdb_add || !dp->ds->ops->port_fdb_del)
2390                         return NOTIFY_DONE;
2391
2392                 switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2393                 if (!switchdev_work)
2394                         return NOTIFY_BAD;
2395
2396                 INIT_WORK(&switchdev_work->work,
2397                           dsa_slave_switchdev_event_work);
2398                 switchdev_work->ds = dp->ds;
2399                 switchdev_work->port = dp->index;
2400                 switchdev_work->event = event;
2401
2402                 ether_addr_copy(switchdev_work->addr,
2403                                 fdb_info->addr);
2404                 switchdev_work->vid = fdb_info->vid;
2405
2406                 /* Hold a reference on the slave for dsa_fdb_offload_notify */
2407                 if (dsa_is_user_port(dp->ds, dp->index))
2408                         dev_hold(dev);
2409                 dsa_schedule_work(&switchdev_work->work);
2410                 break;
2411         default:
2412                 return NOTIFY_DONE;
2413         }
2414
2415         return NOTIFY_OK;
2416 }
2417
2418 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2419                                               unsigned long event, void *ptr)
2420 {
2421         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2422         int err;
2423
2424         switch (event) {
2425         case SWITCHDEV_PORT_OBJ_ADD:
2426                 err = switchdev_handle_port_obj_add(dev, ptr,
2427                                                     dsa_slave_dev_check,
2428                                                     dsa_slave_port_obj_add);
2429                 return notifier_from_errno(err);
2430         case SWITCHDEV_PORT_OBJ_DEL:
2431                 err = switchdev_handle_port_obj_del(dev, ptr,
2432                                                     dsa_slave_dev_check,
2433                                                     dsa_slave_port_obj_del);
2434                 return notifier_from_errno(err);
2435         case SWITCHDEV_PORT_ATTR_SET:
2436                 err = switchdev_handle_port_attr_set(dev, ptr,
2437                                                      dsa_slave_dev_check,
2438                                                      dsa_slave_port_attr_set);
2439                 return notifier_from_errno(err);
2440         }
2441
2442         return NOTIFY_DONE;
2443 }
2444
2445 static struct notifier_block dsa_slave_nb __read_mostly = {
2446         .notifier_call  = dsa_slave_netdevice_event,
2447 };
2448
2449 struct notifier_block dsa_slave_switchdev_notifier = {
2450         .notifier_call = dsa_slave_switchdev_event,
2451 };
2452
2453 struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2454         .notifier_call = dsa_slave_switchdev_blocking_event,
2455 };
2456
2457 int dsa_slave_register_notifier(void)
2458 {
2459         struct notifier_block *nb;
2460         int err;
2461
2462         err = register_netdevice_notifier(&dsa_slave_nb);
2463         if (err)
2464                 return err;
2465
2466         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2467         if (err)
2468                 goto err_switchdev_nb;
2469
2470         nb = &dsa_slave_switchdev_blocking_notifier;
2471         err = register_switchdev_blocking_notifier(nb);
2472         if (err)
2473                 goto err_switchdev_blocking_nb;
2474
2475         return 0;
2476
2477 err_switchdev_blocking_nb:
2478         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2479 err_switchdev_nb:
2480         unregister_netdevice_notifier(&dsa_slave_nb);
2481         return err;
2482 }
2483
2484 void dsa_slave_unregister_notifier(void)
2485 {
2486         struct notifier_block *nb;
2487         int err;
2488
2489         nb = &dsa_slave_switchdev_blocking_notifier;
2490         err = unregister_switchdev_blocking_notifier(nb);
2491         if (err)
2492                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2493
2494         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2495         if (err)
2496                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2497
2498         err = unregister_netdevice_notifier(&dsa_slave_nb);
2499         if (err)
2500                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2501 }