net/dsa/slave.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/dsa/slave.c - Slave device handling
   4  * Copyright (c) 2008-2009 Marvell Semiconductor
   5  */
   6
   7 #include <linux/list.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/phy.h>
  11 #include <linux/phy_fixed.h>
  12 #include <linux/phylink.h>
  13 #include <linux/of_net.h>
  14 #include <linux/of_mdio.h>
  15 #include <linux/mdio.h>
  16 #include <net/rtnetlink.h>
  17 #include <net/pkt_cls.h>
  18 #include <net/selftests.h>
  19 #include <net/tc_act/tc_mirred.h>
  20 #include <linux/if_bridge.h>
  21 #include <linux/if_hsr.h>
  22 #include <linux/netpoll.h>
  23
  24 #include "dsa_priv.h"
  25
  26 /* slave mii_bus handling ***************************************************/
  27 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  28 {
  29         struct dsa_switch *ds = bus->priv;
  30
  31         if (ds->phys_mii_mask & (1 << addr))
  32                 return ds->ops->phy_read(ds, addr, reg);
  33
  34         return 0xffff;
  35 }
  36
  37 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  38 {
  39         struct dsa_switch *ds = bus->priv;
  40
  41         if (ds->phys_mii_mask & (1 << addr))
  42                 return ds->ops->phy_write(ds, addr, reg, val);
  43
  44         return 0;
  45 }
  46
  47 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  48 {
  49         ds->slave_mii_bus->priv = (void *)ds;
  50         ds->slave_mii_bus->name = "dsa slave smi";
  51         ds->slave_mii_bus->read = dsa_slave_phy_read;
  52         ds->slave_mii_bus->write = dsa_slave_phy_write;
  53         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  54                  ds->dst->index, ds->index);
  55         ds->slave_mii_bus->parent = ds->dev;
  56         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  57 }
  58
  59
  60 /* slave device handling ****************************************************/
  61 static int dsa_slave_get_iflink(const struct net_device *dev)
  62 {
  63         return dsa_slave_to_master(dev)->ifindex;
  64 }
  65
  66 static int dsa_slave_open(struct net_device *dev)
  67 {
  68         struct net_device *master = dsa_slave_to_master(dev);
  69         struct dsa_port *dp = dsa_slave_to_port(dev);
  70         int err;
  71
  72         err = dev_open(master, NULL);
  73         if (err < 0) {
  74                 netdev_err(dev, "failed to open master %s\n", master->name);
  75                 goto out;
  76         }
  77
  78         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  79                 err = dev_uc_add(master, dev->dev_addr);
  80                 if (err < 0)
  81                         goto out;
  82         }
  83
  84         if (dev->flags & IFF_ALLMULTI) {
  85                 err = dev_set_allmulti(master, 1);
  86                 if (err < 0)
  87                         goto del_unicast;
  88         }
  89         if (dev->flags & IFF_PROMISC) {
  90                 err = dev_set_promiscuity(master, 1);
  91                 if (err < 0)
  92                         goto clear_allmulti;
  93         }
  94
  95         err = dsa_port_enable_rt(dp, dev->phydev);
  96         if (err)
  97                 goto clear_promisc;
  98
  99         return 0;
 100
 101 clear_promisc:
 102         if (dev->flags & IFF_PROMISC)
 103                 dev_set_promiscuity(master, -1);
 104 clear_allmulti:
 105         if (dev->flags & IFF_ALLMULTI)
 106                 dev_set_allmulti(master, -1);
 107 del_unicast:
 108         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 109                 dev_uc_del(master, dev->dev_addr);
 110 out:
 111         return err;
 112 }
 113
 114 static int dsa_slave_close(struct net_device *dev)
 115 {
 116         struct net_device *master = dsa_slave_to_master(dev);
 117         struct dsa_port *dp = dsa_slave_to_port(dev);
 118
 119         dsa_port_disable_rt(dp);
 120
 121         dev_mc_unsync(master, dev);
 122         dev_uc_unsync(master, dev);
 123         if (dev->flags & IFF_ALLMULTI)
 124                 dev_set_allmulti(master, -1);
 125         if (dev->flags & IFF_PROMISC)
 126                 dev_set_promiscuity(master, -1);
 127
 128         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 129                 dev_uc_del(master, dev->dev_addr);
 130
 131         return 0;
 132 }
 133
 134 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 135 {
 136         struct net_device *master = dsa_slave_to_master(dev);
 137         if (dev->flags & IFF_UP) {
 138                 if (change & IFF_ALLMULTI)
 139                         dev_set_allmulti(master,
 140                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 141                 if (change & IFF_PROMISC)
 142                         dev_set_promiscuity(master,
 143                                             dev->flags & IFF_PROMISC ? 1 : -1);
 144         }
 145 }
 146
 147 static void dsa_slave_set_rx_mode(struct net_device *dev)
 148 {
 149         struct net_device *master = dsa_slave_to_master(dev);
 150
 151         dev_mc_sync(master, dev);
 152         dev_uc_sync(master, dev);
 153 }
 154
 155 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 156 {
 157         struct net_device *master = dsa_slave_to_master(dev);
 158         struct sockaddr *addr = a;
 159         int err;
 160
 161         if (!is_valid_ether_addr(addr->sa_data))
 162                 return -EADDRNOTAVAIL;
 163
 164         if (!(dev->flags & IFF_UP))
 165                 goto out;
 166
 167         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 168                 err = dev_uc_add(master, addr->sa_data);
 169                 if (err < 0)
 170                         return err;
 171         }
 172
 173         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 174                 dev_uc_del(master, dev->dev_addr);
 175
 176 out:
 177         ether_addr_copy(dev->dev_addr, addr->sa_data);
 178
 179         return 0;
 180 }
 181
 182 struct dsa_slave_dump_ctx {
 183         struct net_device *dev;
 184         struct sk_buff *skb;
 185         struct netlink_callback *cb;
 186         int idx;
 187 };
 188
 189 static int
 190 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 191                            bool is_static, void *data)
 192 {
 193         struct dsa_slave_dump_ctx *dump = data;
 194         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 195         u32 seq = dump->cb->nlh->nlmsg_seq;
 196         struct nlmsghdr *nlh;
 197         struct ndmsg *ndm;
 198
 199         if (dump->idx < dump->cb->args[2])
 200                 goto skip;
 201
 202         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 203                         sizeof(*ndm), NLM_F_MULTI);
 204         if (!nlh)
 205                 return -EMSGSIZE;
 206
 207         ndm = nlmsg_data(nlh);
 208         ndm->ndm_family  = AF_BRIDGE;
 209         ndm->ndm_pad1    = 0;
 210         ndm->ndm_pad2    = 0;
 211         ndm->ndm_flags   = NTF_SELF;
 212         ndm->ndm_type    = 0;
 213         ndm->ndm_ifindex = dump->dev->ifindex;
 214         ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 215
 216         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 217                 goto nla_put_failure;
 218
 219         if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 220                 goto nla_put_failure;
 221
 222         nlmsg_end(dump->skb, nlh);
 223
 224 skip:
 225         dump->idx++;
 226         return 0;
 227
 228 nla_put_failure:
 229         nlmsg_cancel(dump->skb, nlh);
 230         return -EMSGSIZE;
 231 }
 232
 233 static int
 234 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 235                    struct net_device *dev, struct net_device *filter_dev,
 236                    int *idx)
 237 {
 238         struct dsa_port *dp = dsa_slave_to_port(dev);
 239         struct dsa_slave_dump_ctx dump = {
 240                 .dev = dev,
 241                 .skb = skb,
 242                 .cb = cb,
 243                 .idx = *idx,
 244         };
 245         int err;
 246
 247         err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 248         *idx = dump.idx;
 249
 250         return err;
 251 }
 252
 253 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 254 {
 255         struct dsa_slave_priv *p = netdev_priv(dev);
 256         struct dsa_switch *ds = p->dp->ds;
 257         int port = p->dp->index;
 258
 259         /* Pass through to switch driver if it supports timestamping */
 260         switch (cmd) {
 261         case SIOCGHWTSTAMP:
 262                 if (ds->ops->port_hwtstamp_get)
 263                         return ds->ops->port_hwtstamp_get(ds, port, ifr);
 264                 break;
 265         case SIOCSHWTSTAMP:
 266                 if (ds->ops->port_hwtstamp_set)
 267                         return ds->ops->port_hwtstamp_set(ds, port, ifr);
 268                 break;
 269         }
 270
 271         return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 272 }
 273
 274 static int dsa_slave_port_attr_set(struct net_device *dev,
 275                                    const struct switchdev_attr *attr,
 276                                    struct netlink_ext_ack *extack)
 277 {
 278         struct dsa_port *dp = dsa_slave_to_port(dev);
 279         int ret;
 280
 281         switch (attr->id) {
 282         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 283                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 284                         return -EOPNOTSUPP;
 285
 286                 ret = dsa_port_set_state(dp, attr->u.stp_state);
 287                 break;
 288         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 289                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 290                         return -EOPNOTSUPP;
 291
 292                 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 293                                               extack);
 294                 break;
 295         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 296                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 297                         return -EOPNOTSUPP;
 298
 299                 ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 300                 break;
 301         case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 302                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 303                         return -EOPNOTSUPP;
 304
 305                 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 306                                                 extack);
 307                 break;
 308         case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 309                 if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 310                         return -EOPNOTSUPP;
 311
 312                 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 313                 break;
 314         case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 315                 if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 316                         return -EOPNOTSUPP;
 317
 318                 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, extack);
 319                 break;
 320         default:
 321                 ret = -EOPNOTSUPP;
 322                 break;
 323         }
 324
 325         return ret;
 326 }
 327
 328 /* Must be called under rcu_read_lock() */
 329 static int
 330 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 331                                       const struct switchdev_obj_port_vlan *vlan)
 332 {
 333         struct net_device *upper_dev;
 334         struct list_head *iter;
 335
 336         netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 337                 u16 vid;
 338
 339                 if (!is_vlan_dev(upper_dev))
 340                         continue;
 341
 342                 vid = vlan_dev_vlan_id(upper_dev);
 343                 if (vid == vlan->vid)
 344                         return -EBUSY;
 345         }
 346
 347         return 0;
 348 }
 349
 350 static int dsa_slave_vlan_add(struct net_device *dev,
 351                               const struct switchdev_obj *obj,
 352                               struct netlink_ext_ack *extack)
 353 {
 354         struct net_device *master = dsa_slave_to_master(dev);
 355         struct dsa_port *dp = dsa_slave_to_port(dev);
 356         struct switchdev_obj_port_vlan vlan;
 357         int err;
 358
 359         if (dsa_port_skip_vlan_configuration(dp)) {
 360                 NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 361                 return 0;
 362         }
 363
 364         vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 365
 366         /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 367          * the same VID.
 368          */
 369         if (br_vlan_enabled(dp->bridge_dev)) {
 370                 rcu_read_lock();
 371                 err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
 372                 rcu_read_unlock();
 373                 if (err) {
 374                         NL_SET_ERR_MSG_MOD(extack,
 375                                            "Port already has a VLAN upper with this VID");
 376                         return err;
 377                 }
 378         }
 379
 380         err = dsa_port_vlan_add(dp, &vlan, extack);
 381         if (err)
 382                 return err;
 383
 384         /* We need the dedicated CPU port to be a member of the VLAN as well.
 385          * Even though drivers often handle CPU membership in special ways,
 386          * it doesn't make sense to program a PVID, so clear this flag.
 387          */
 388         vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 389
 390         err = dsa_port_vlan_add(dp->cpu_dp, &vlan, extack);
 391         if (err)
 392                 return err;
 393
 394         return vlan_vid_add(master, htons(ETH_P_8021Q), vlan.vid);
 395 }
 396
 397 static int dsa_slave_port_obj_add(struct net_device *dev,
 398                                   const struct switchdev_obj *obj,
 399                                   struct netlink_ext_ack *extack)
 400 {
 401         struct dsa_port *dp = dsa_slave_to_port(dev);
 402         int err;
 403
 404         switch (obj->id) {
 405         case SWITCHDEV_OBJ_ID_PORT_MDB:
 406                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 407                         return -EOPNOTSUPP;
 408
 409                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 410                 break;
 411         case SWITCHDEV_OBJ_ID_HOST_MDB:
 412                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 413                         return -EOPNOTSUPP;
 414
 415                 /* DSA can directly translate this to a normal MDB add,
 416                  * but on the CPU port.
 417                  */
 418                 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 419                 break;
 420         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 421                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 422                         return -EOPNOTSUPP;
 423
 424                 err = dsa_slave_vlan_add(dev, obj, extack);
 425                 break;
 426         case SWITCHDEV_OBJ_ID_MRP:
 427                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 428                         return -EOPNOTSUPP;
 429
 430                 err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 431                 break;
 432         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 433                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 434                         return -EOPNOTSUPP;
 435
 436                 err = dsa_port_mrp_add_ring_role(dp,
 437                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 438                 break;
 439         default:
 440                 err = -EOPNOTSUPP;
 441                 break;
 442         }
 443
 444         return err;
 445 }
 446
 447 static int dsa_slave_vlan_del(struct net_device *dev,
 448                               const struct switchdev_obj *obj)
 449 {
 450         struct net_device *master = dsa_slave_to_master(dev);
 451         struct dsa_port *dp = dsa_slave_to_port(dev);
 452         struct switchdev_obj_port_vlan *vlan;
 453         int err;
 454
 455         if (dsa_port_skip_vlan_configuration(dp))
 456                 return 0;
 457
 458         vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 459
 460         /* Do not deprogram the CPU port as it may be shared with other user
 461          * ports which can be members of this VLAN as well.
 462          */
 463         err = dsa_port_vlan_del(dp, vlan);
 464         if (err)
 465                 return err;
 466
 467         vlan_vid_del(master, htons(ETH_P_8021Q), vlan->vid);
 468
 469         return 0;
 470 }
 471
 472 static int dsa_slave_port_obj_del(struct net_device *dev,
 473                                   const struct switchdev_obj *obj)
 474 {
 475         struct dsa_port *dp = dsa_slave_to_port(dev);
 476         int err;
 477
 478         switch (obj->id) {
 479         case SWITCHDEV_OBJ_ID_PORT_MDB:
 480                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 481                         return -EOPNOTSUPP;
 482
 483                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 484                 break;
 485         case SWITCHDEV_OBJ_ID_HOST_MDB:
 486                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 487                         return -EOPNOTSUPP;
 488
 489                 /* DSA can directly translate this to a normal MDB add,
 490                  * but on the CPU port.
 491                  */
 492                 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 493                 break;
 494         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 495                 if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 496                         return -EOPNOTSUPP;
 497
 498                 err = dsa_slave_vlan_del(dev, obj);
 499                 break;
 500         case SWITCHDEV_OBJ_ID_MRP:
 501                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 502                         return -EOPNOTSUPP;
 503
 504                 err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 505                 break;
 506         case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 507                 if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 508                         return -EOPNOTSUPP;
 509
 510                 err = dsa_port_mrp_del_ring_role(dp,
 511                                                  SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 512                 break;
 513         default:
 514                 err = -EOPNOTSUPP;
 515                 break;
 516         }
 517
 518         return err;
 519 }
 520
 521 static int dsa_slave_get_port_parent_id(struct net_device *dev,
 522                                         struct netdev_phys_item_id *ppid)
 523 {
 524         struct dsa_port *dp = dsa_slave_to_port(dev);
 525         struct dsa_switch *ds = dp->ds;
 526         struct dsa_switch_tree *dst = ds->dst;
 527
 528         /* For non-legacy ports, devlink is used and it takes
 529          * care of the name generation. This ndo implementation
 530          * should be removed with legacy support.
 531          */
 532         if (dp->ds->devlink)
 533                 return -EOPNOTSUPP;
 534
 535         ppid->id_len = sizeof(dst->index);
 536         memcpy(&ppid->id, &dst->index, ppid->id_len);
 537
 538         return 0;
 539 }
 540
 541 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 542                                                      struct sk_buff *skb)
 543 {
 544 #ifdef CONFIG_NET_POLL_CONTROLLER
 545         struct dsa_slave_priv *p = netdev_priv(dev);
 546
 547         return netpoll_send_skb(p->netpoll, skb);
 548 #else
 549         BUG();
 550         return NETDEV_TX_OK;
 551 #endif
 552 }
 553
 554 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 555                                  struct sk_buff *skb)
 556 {
 557         struct dsa_switch *ds = p->dp->ds;
 558
 559         if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 560                 return;
 561
 562         if (!ds->ops->port_txtstamp)
 563                 return;
 564
 565         ds->ops->port_txtstamp(ds, p->dp->index, skb);
 566 }
 567
 568 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 569 {
 570         /* SKB for netpoll still need to be mangled with the protocol-specific
 571          * tag to be successfully transmitted
 572          */
 573         if (unlikely(netpoll_tx_running(dev)))
 574                 return dsa_slave_netpoll_send_skb(dev, skb);
 575
 576         /* Queue the SKB for transmission on the parent interface, but
 577          * do not modify its EtherType
 578          */
 579         skb->dev = dsa_slave_to_master(dev);
 580         dev_queue_xmit(skb);
 581
 582         return NETDEV_TX_OK;
 583 }
 584 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 585
 586 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 587 {
 588         int needed_headroom = dev->needed_headroom;
 589         int needed_tailroom = dev->needed_tailroom;
 590
 591         /* For tail taggers, we need to pad short frames ourselves, to ensure
 592          * that the tail tag does not fail at its role of being at the end of
 593          * the packet, once the master interface pads the frame. Account for
 594          * that pad length here, and pad later.
 595          */
 596         if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 597                 needed_tailroom += ETH_ZLEN - skb->len;
 598         /* skb_headroom() returns unsigned int... */
 599         needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 600         needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 601
 602         if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 603                 /* No reallocation needed, yay! */
 604                 return 0;
 605
 606         return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 607                                 GFP_ATOMIC);
 608 }
 609
 610 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 611 {
 612         struct dsa_slave_priv *p = netdev_priv(dev);
 613         struct sk_buff *nskb;
 614
 615         dev_sw_netstats_tx_add(dev, 1, skb->len);
 616
 617         memset(skb->cb, 0, sizeof(skb->cb));
 618
 619         /* Handle tx timestamp if any */
 620         dsa_skb_tx_timestamp(p, skb);
 621
 622         if (dsa_realloc_skb(skb, dev)) {
 623                 dev_kfree_skb_any(skb);
 624                 return NETDEV_TX_OK;
 625         }
 626
 627         /* needed_tailroom should still be 'warm' in the cache line from
 628          * dsa_realloc_skb(), which has also ensured that padding is safe.
 629          */
 630         if (dev->needed_tailroom)
 631                 eth_skb_pad(skb);
 632
 633         /* Transmit function may have to reallocate the original SKB,
 634          * in which case it must have freed it. Only free it here on error.
 635          */
 636         nskb = p->xmit(skb, dev);
 637         if (!nskb) {
 638                 kfree_skb(skb);
 639                 return NETDEV_TX_OK;
 640         }
 641
 642         return dsa_enqueue_skb(nskb, dev);
 643 }
 644
 645 /* ethtool operations *******************************************************/
 646
 647 static void dsa_slave_get_drvinfo(struct net_device *dev,
 648                                   struct ethtool_drvinfo *drvinfo)
 649 {
 650         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 651         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 652         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 653 }
 654
 655 static int dsa_slave_get_regs_len(struct net_device *dev)
 656 {
 657         struct dsa_port *dp = dsa_slave_to_port(dev);
 658         struct dsa_switch *ds = dp->ds;
 659
 660         if (ds->ops->get_regs_len)
 661                 return ds->ops->get_regs_len(ds, dp->index);
 662
 663         return -EOPNOTSUPP;
 664 }
 665
 666 static void
 667 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 668 {
 669         struct dsa_port *dp = dsa_slave_to_port(dev);
 670         struct dsa_switch *ds = dp->ds;
 671
 672         if (ds->ops->get_regs)
 673                 ds->ops->get_regs(ds, dp->index, regs, _p);
 674 }
 675
 676 static int dsa_slave_nway_reset(struct net_device *dev)
 677 {
 678         struct dsa_port *dp = dsa_slave_to_port(dev);
 679
 680         return phylink_ethtool_nway_reset(dp->pl);
 681 }
 682
 683 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 684 {
 685         struct dsa_port *dp = dsa_slave_to_port(dev);
 686         struct dsa_switch *ds = dp->ds;
 687
 688         if (ds->cd && ds->cd->eeprom_len)
 689                 return ds->cd->eeprom_len;
 690
 691         if (ds->ops->get_eeprom_len)
 692                 return ds->ops->get_eeprom_len(ds);
 693
 694         return 0;
 695 }
 696
 697 static int dsa_slave_get_eeprom(struct net_device *dev,
 698                                 struct ethtool_eeprom *eeprom, u8 *data)
 699 {
 700         struct dsa_port *dp = dsa_slave_to_port(dev);
 701         struct dsa_switch *ds = dp->ds;
 702
 703         if (ds->ops->get_eeprom)
 704                 return ds->ops->get_eeprom(ds, eeprom, data);
 705
 706         return -EOPNOTSUPP;
 707 }
 708
 709 static int dsa_slave_set_eeprom(struct net_device *dev,
 710                                 struct ethtool_eeprom *eeprom, u8 *data)
 711 {
 712         struct dsa_port *dp = dsa_slave_to_port(dev);
 713         struct dsa_switch *ds = dp->ds;
 714
 715         if (ds->ops->set_eeprom)
 716                 return ds->ops->set_eeprom(ds, eeprom, data);
 717
 718         return -EOPNOTSUPP;
 719 }
 720
 721 static void dsa_slave_get_strings(struct net_device *dev,
 722                                   uint32_t stringset, uint8_t *data)
 723 {
 724         struct dsa_port *dp = dsa_slave_to_port(dev);
 725         struct dsa_switch *ds = dp->ds;
 726
 727         if (stringset == ETH_SS_STATS) {
 728                 int len = ETH_GSTRING_LEN;
 729
 730                 strncpy(data, "tx_packets", len);
 731                 strncpy(data + len, "tx_bytes", len);
 732                 strncpy(data + 2 * len, "rx_packets", len);
 733                 strncpy(data + 3 * len, "rx_bytes", len);
 734                 if (ds->ops->get_strings)
 735                         ds->ops->get_strings(ds, dp->index, stringset,
 736                                              data + 4 * len);
 737         } else if (stringset ==  ETH_SS_TEST) {
 738                 net_selftest_get_strings(data);
 739         }
 740
 741 }
 742
 743 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 744                                         struct ethtool_stats *stats,
 745                                         uint64_t *data)
 746 {
 747         struct dsa_port *dp = dsa_slave_to_port(dev);
 748         struct dsa_switch *ds = dp->ds;
 749         struct pcpu_sw_netstats *s;
 750         unsigned int start;
 751         int i;
 752
 753         for_each_possible_cpu(i) {
 754                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 755
 756                 s = per_cpu_ptr(dev->tstats, i);
 757                 do {
 758                         start = u64_stats_fetch_begin_irq(&s->syncp);
 759                         tx_packets = s->tx_packets;
 760                         tx_bytes = s->tx_bytes;
 761                         rx_packets = s->rx_packets;
 762                         rx_bytes = s->rx_bytes;
 763                 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
 764                 data[0] += tx_packets;
 765                 data[1] += tx_bytes;
 766                 data[2] += rx_packets;
 767                 data[3] += rx_bytes;
 768         }
 769         if (ds->ops->get_ethtool_stats)
 770                 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 771 }
 772
 773 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 774 {
 775         struct dsa_port *dp = dsa_slave_to_port(dev);
 776         struct dsa_switch *ds = dp->ds;
 777
 778         if (sset == ETH_SS_STATS) {
 779                 int count = 0;
 780
 781                 if (ds->ops->get_sset_count) {
 782                         count = ds->ops->get_sset_count(ds, dp->index, sset);
 783                         if (count < 0)
 784                                 return count;
 785                 }
 786
 787                 return count + 4;
 788         } else if (sset ==  ETH_SS_TEST) {
 789                 return net_selftest_get_count();
 790         }
 791
 792         return -EOPNOTSUPP;
 793 }
 794
 795 static void dsa_slave_net_selftest(struct net_device *ndev,
 796                                    struct ethtool_test *etest, u64 *buf)
 797 {
 798         struct dsa_port *dp = dsa_slave_to_port(ndev);
 799         struct dsa_switch *ds = dp->ds;
 800
 801         if (ds->ops->self_test) {
 802                 ds->ops->self_test(ds, dp->index, etest, buf);
 803                 return;
 804         }
 805
 806         net_selftest(ndev, etest, buf);
 807 }
 808
 809 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 810 {
 811         struct dsa_port *dp = dsa_slave_to_port(dev);
 812         struct dsa_switch *ds = dp->ds;
 813
 814         phylink_ethtool_get_wol(dp->pl, w);
 815
 816         if (ds->ops->get_wol)
 817                 ds->ops->get_wol(ds, dp->index, w);
 818 }
 819
 820 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 821 {
 822         struct dsa_port *dp = dsa_slave_to_port(dev);
 823         struct dsa_switch *ds = dp->ds;
 824         int ret = -EOPNOTSUPP;
 825
 826         phylink_ethtool_set_wol(dp->pl, w);
 827
 828         if (ds->ops->set_wol)
 829                 ret = ds->ops->set_wol(ds, dp->index, w);
 830
 831         return ret;
 832 }
 833
 834 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 835 {
 836         struct dsa_port *dp = dsa_slave_to_port(dev);
 837         struct dsa_switch *ds = dp->ds;
 838         int ret;
 839
 840         /* Port's PHY and MAC both need to be EEE capable */
 841         if (!dev->phydev || !dp->pl)
 842                 return -ENODEV;
 843
 844         if (!ds->ops->set_mac_eee)
 845                 return -EOPNOTSUPP;
 846
 847         ret = ds->ops->set_mac_eee(ds, dp->index, e);
 848         if (ret)
 849                 return ret;
 850
 851         return phylink_ethtool_set_eee(dp->pl, e);
 852 }
 853
 854 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 855 {
 856         struct dsa_port *dp = dsa_slave_to_port(dev);
 857         struct dsa_switch *ds = dp->ds;
 858         int ret;
 859
 860         /* Port's PHY and MAC both need to be EEE capable */
 861         if (!dev->phydev || !dp->pl)
 862                 return -ENODEV;
 863
 864         if (!ds->ops->get_mac_eee)
 865                 return -EOPNOTSUPP;
 866
 867         ret = ds->ops->get_mac_eee(ds, dp->index, e);
 868         if (ret)
 869                 return ret;
 870
 871         return phylink_ethtool_get_eee(dp->pl, e);
 872 }
 873
 874 static int dsa_slave_get_link_ksettings(struct net_device *dev,
 875                                         struct ethtool_link_ksettings *cmd)
 876 {
 877         struct dsa_port *dp = dsa_slave_to_port(dev);
 878
 879         return phylink_ethtool_ksettings_get(dp->pl, cmd);
 880 }
 881
 882 static int dsa_slave_set_link_ksettings(struct net_device *dev,
 883                                         const struct ethtool_link_ksettings *cmd)
 884 {
 885         struct dsa_port *dp = dsa_slave_to_port(dev);
 886
 887         return phylink_ethtool_ksettings_set(dp->pl, cmd);
 888 }
 889
 890 static void dsa_slave_get_pauseparam(struct net_device *dev,
 891                                      struct ethtool_pauseparam *pause)
 892 {
 893         struct dsa_port *dp = dsa_slave_to_port(dev);
 894
 895         phylink_ethtool_get_pauseparam(dp->pl, pause);
 896 }
 897
 898 static int dsa_slave_set_pauseparam(struct net_device *dev,
 899                                     struct ethtool_pauseparam *pause)
 900 {
 901         struct dsa_port *dp = dsa_slave_to_port(dev);
 902
 903         return phylink_ethtool_set_pauseparam(dp->pl, pause);
 904 }
 905
 906 #ifdef CONFIG_NET_POLL_CONTROLLER
 907 static int dsa_slave_netpoll_setup(struct net_device *dev,
 908                                    struct netpoll_info *ni)
 909 {
 910         struct net_device *master = dsa_slave_to_master(dev);
 911         struct dsa_slave_priv *p = netdev_priv(dev);
 912         struct netpoll *netpoll;
 913         int err = 0;
 914
 915         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 916         if (!netpoll)
 917                 return -ENOMEM;
 918
 919         err = __netpoll_setup(netpoll, master);
 920         if (err) {
 921                 kfree(netpoll);
 922                 goto out;
 923         }
 924
 925         p->netpoll = netpoll;
 926 out:
 927         return err;
 928 }
 929
 930 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 931 {
 932         struct dsa_slave_priv *p = netdev_priv(dev);
 933         struct netpoll *netpoll = p->netpoll;
 934
 935         if (!netpoll)
 936                 return;
 937
 938         p->netpoll = NULL;
 939
 940         __netpoll_free(netpoll);
 941 }
 942
 943 static void dsa_slave_poll_controller(struct net_device *dev)
 944 {
 945 }
 946 #endif
 947
 948 static int dsa_slave_get_phys_port_name(struct net_device *dev,
 949                                         char *name, size_t len)
 950 {
 951         struct dsa_port *dp = dsa_slave_to_port(dev);
 952
 953         /* For non-legacy ports, devlink is used and it takes
 954          * care of the name generation. This ndo implementation
 955          * should be removed with legacy support.
 956          */
 957         if (dp->ds->devlink)
 958                 return -EOPNOTSUPP;
 959
 960         if (snprintf(name, len, "p%d", dp->index) >= len)
 961                 return -EINVAL;
 962
 963         return 0;
 964 }
 965
 966 static struct dsa_mall_tc_entry *
 967 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 968 {
 969         struct dsa_slave_priv *p = netdev_priv(dev);
 970         struct dsa_mall_tc_entry *mall_tc_entry;
 971
 972         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 973                 if (mall_tc_entry->cookie == cookie)
 974                         return mall_tc_entry;
 975
 976         return NULL;
 977 }
 978
 979 static int
 980 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 981                                   struct tc_cls_matchall_offload *cls,
 982                                   bool ingress)
 983 {
 984         struct dsa_port *dp = dsa_slave_to_port(dev);
 985         struct dsa_slave_priv *p = netdev_priv(dev);
 986         struct dsa_mall_mirror_tc_entry *mirror;
 987         struct dsa_mall_tc_entry *mall_tc_entry;
 988         struct dsa_switch *ds = dp->ds;
 989         struct flow_action_entry *act;
 990         struct dsa_port *to_dp;
 991         int err;
 992
 993         if (!ds->ops->port_mirror_add)
 994                 return -EOPNOTSUPP;
 995
 996         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 997                                               cls->common.extack))
 998                 return -EOPNOTSUPP;
 999
1000         act = &cls->rule->action.entries[0];
1001
1002         if (!act->dev)
1003                 return -EINVAL;
1004
1005         if (!dsa_slave_dev_check(act->dev))
1006                 return -EOPNOTSUPP;
1007
1008         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1009         if (!mall_tc_entry)
1010                 return -ENOMEM;
1011
1012         mall_tc_entry->cookie = cls->cookie;
1013         mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1014         mirror = &mall_tc_entry->mirror;
1015
1016         to_dp = dsa_slave_to_port(act->dev);
1017
1018         mirror->to_local_port = to_dp->index;
1019         mirror->ingress = ingress;
1020
1021         err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
1022         if (err) {
1023                 kfree(mall_tc_entry);
1024                 return err;
1025         }
1026
1027         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1028
1029         return err;
1030 }
1031
1032 static int
1033 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1034                                   struct tc_cls_matchall_offload *cls,
1035                                   bool ingress)
1036 {
1037         struct netlink_ext_ack *extack = cls->common.extack;
1038         struct dsa_port *dp = dsa_slave_to_port(dev);
1039         struct dsa_slave_priv *p = netdev_priv(dev);
1040         struct dsa_mall_policer_tc_entry *policer;
1041         struct dsa_mall_tc_entry *mall_tc_entry;
1042         struct dsa_switch *ds = dp->ds;
1043         struct flow_action_entry *act;
1044         int err;
1045
1046         if (!ds->ops->port_policer_add) {
1047                 NL_SET_ERR_MSG_MOD(extack,
1048                                    "Policing offload not implemented");
1049                 return -EOPNOTSUPP;
1050         }
1051
1052         if (!ingress) {
1053                 NL_SET_ERR_MSG_MOD(extack,
1054                                    "Only supported on ingress qdisc");
1055                 return -EOPNOTSUPP;
1056         }
1057
1058         if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1059                                               cls->common.extack))
1060                 return -EOPNOTSUPP;
1061
1062         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1063                 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1064                         NL_SET_ERR_MSG_MOD(extack,
1065                                            "Only one port policer allowed");
1066                         return -EEXIST;
1067                 }
1068         }
1069
1070         act = &cls->rule->action.entries[0];
1071
1072         mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1073         if (!mall_tc_entry)
1074                 return -ENOMEM;
1075
1076         mall_tc_entry->cookie = cls->cookie;
1077         mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1078         policer = &mall_tc_entry->policer;
1079         policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1080         policer->burst = act->police.burst;
1081
1082         err = ds->ops->port_policer_add(ds, dp->index, policer);
1083         if (err) {
1084                 kfree(mall_tc_entry);
1085                 return err;
1086         }
1087
1088         list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1089
1090         return err;
1091 }
1092
1093 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1094                                       struct tc_cls_matchall_offload *cls,
1095                                       bool ingress)
1096 {
1097         int err = -EOPNOTSUPP;
1098
1099         if (cls->common.protocol == htons(ETH_P_ALL) &&
1100             flow_offload_has_one_action(&cls->rule->action) &&
1101             cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1102                 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1103         else if (flow_offload_has_one_action(&cls->rule->action) &&
1104                  cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1105                 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1106
1107         return err;
1108 }
1109
1110 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1111                                        struct tc_cls_matchall_offload *cls)
1112 {
1113         struct dsa_port *dp = dsa_slave_to_port(dev);
1114         struct dsa_mall_tc_entry *mall_tc_entry;
1115         struct dsa_switch *ds = dp->ds;
1116
1117         mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1118         if (!mall_tc_entry)
1119                 return;
1120
1121         list_del(&mall_tc_entry->list);
1122
1123         switch (mall_tc_entry->type) {
1124         case DSA_PORT_MALL_MIRROR:
1125                 if (ds->ops->port_mirror_del)
1126                         ds->ops->port_mirror_del(ds, dp->index,
1127                                                  &mall_tc_entry->mirror);
1128                 break;
1129         case DSA_PORT_MALL_POLICER:
1130                 if (ds->ops->port_policer_del)
1131                         ds->ops->port_policer_del(ds, dp->index);
1132                 break;
1133         default:
1134                 WARN_ON(1);
1135         }
1136
1137         kfree(mall_tc_entry);
1138 }
1139
1140 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1141                                            struct tc_cls_matchall_offload *cls,
1142                                            bool ingress)
1143 {
1144         if (cls->common.chain_index)
1145                 return -EOPNOTSUPP;
1146
1147         switch (cls->command) {
1148         case TC_CLSMATCHALL_REPLACE:
1149                 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1150         case TC_CLSMATCHALL_DESTROY:
1151                 dsa_slave_del_cls_matchall(dev, cls);
1152                 return 0;
1153         default:
1154                 return -EOPNOTSUPP;
1155         }
1156 }
1157
1158 static int dsa_slave_add_cls_flower(struct net_device *dev,
1159                                     struct flow_cls_offload *cls,
1160                                     bool ingress)
1161 {
1162         struct dsa_port *dp = dsa_slave_to_port(dev);
1163         struct dsa_switch *ds = dp->ds;
1164         int port = dp->index;
1165
1166         if (!ds->ops->cls_flower_add)
1167                 return -EOPNOTSUPP;
1168
1169         return ds->ops->cls_flower_add(ds, port, cls, ingress);
1170 }
1171
1172 static int dsa_slave_del_cls_flower(struct net_device *dev,
1173                                     struct flow_cls_offload *cls,
1174                                     bool ingress)
1175 {
1176         struct dsa_port *dp = dsa_slave_to_port(dev);
1177         struct dsa_switch *ds = dp->ds;
1178         int port = dp->index;
1179
1180         if (!ds->ops->cls_flower_del)
1181                 return -EOPNOTSUPP;
1182
1183         return ds->ops->cls_flower_del(ds, port, cls, ingress);
1184 }
1185
1186 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1187                                       struct flow_cls_offload *cls,
1188                                       bool ingress)
1189 {
1190         struct dsa_port *dp = dsa_slave_to_port(dev);
1191         struct dsa_switch *ds = dp->ds;
1192         int port = dp->index;
1193
1194         if (!ds->ops->cls_flower_stats)
1195                 return -EOPNOTSUPP;
1196
1197         return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1198 }
1199
1200 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1201                                          struct flow_cls_offload *cls,
1202                                          bool ingress)
1203 {
1204         switch (cls->command) {
1205         case FLOW_CLS_REPLACE:
1206                 return dsa_slave_add_cls_flower(dev, cls, ingress);
1207         case FLOW_CLS_DESTROY:
1208                 return dsa_slave_del_cls_flower(dev, cls, ingress);
1209         case FLOW_CLS_STATS:
1210                 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1211         default:
1212                 return -EOPNOTSUPP;
1213         }
1214 }
1215
1216 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1217                                        void *cb_priv, bool ingress)
1218 {
1219         struct net_device *dev = cb_priv;
1220
1221         if (!tc_can_offload(dev))
1222                 return -EOPNOTSUPP;
1223
1224         switch (type) {
1225         case TC_SETUP_CLSMATCHALL:
1226                 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1227         case TC_SETUP_CLSFLOWER:
1228                 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1229         default:
1230                 return -EOPNOTSUPP;
1231         }
1232 }
1233
1234 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1235                                           void *type_data, void *cb_priv)
1236 {
1237         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1238 }
1239
1240 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1241                                           void *type_data, void *cb_priv)
1242 {
1243         return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1244 }
1245
1246 static LIST_HEAD(dsa_slave_block_cb_list);
1247
1248 static int dsa_slave_setup_tc_block(struct net_device *dev,
1249                                     struct flow_block_offload *f)
1250 {
1251         struct flow_block_cb *block_cb;
1252         flow_setup_cb_t *cb;
1253
1254         if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1255                 cb = dsa_slave_setup_tc_block_cb_ig;
1256         else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1257                 cb = dsa_slave_setup_tc_block_cb_eg;
1258         else
1259                 return -EOPNOTSUPP;
1260
1261         f->driver_block_list = &dsa_slave_block_cb_list;
1262
1263         switch (f->command) {
1264         case FLOW_BLOCK_BIND:
1265                 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1266                         return -EBUSY;
1267
1268                 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1269                 if (IS_ERR(block_cb))
1270                         return PTR_ERR(block_cb);
1271
1272                 flow_block_cb_add(block_cb, f);
1273                 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1274                 return 0;
1275         case FLOW_BLOCK_UNBIND:
1276                 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1277                 if (!block_cb)
1278                         return -ENOENT;
1279
1280                 flow_block_cb_remove(block_cb, f);
1281                 list_del(&block_cb->driver_list);
1282                 return 0;
1283         default:
1284                 return -EOPNOTSUPP;
1285         }
1286 }
1287
1288 static int dsa_slave_setup_ft_block(struct dsa_switch *ds, int port,
1289                                     void *type_data)
1290 {
1291         struct dsa_port *cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1292         struct net_device *master = cpu_dp->master;
1293
1294         if (!master->netdev_ops->ndo_setup_tc)
1295                 return -EOPNOTSUPP;
1296
1297         return master->netdev_ops->ndo_setup_tc(master, TC_SETUP_FT, type_data);
1298 }
1299
1300 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1301                               void *type_data)
1302 {
1303         struct dsa_port *dp = dsa_slave_to_port(dev);
1304         struct dsa_switch *ds = dp->ds;
1305
1306         switch (type) {
1307         case TC_SETUP_BLOCK:
1308                 return dsa_slave_setup_tc_block(dev, type_data);
1309         case TC_SETUP_FT:
1310                 return dsa_slave_setup_ft_block(ds, dp->index, type_data);
1311         default:
1312                 break;
1313         }
1314
1315         if (!ds->ops->port_setup_tc)
1316                 return -EOPNOTSUPP;
1317
1318         return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1319 }
1320
1321 static int dsa_slave_get_rxnfc(struct net_device *dev,
1322                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1323 {
1324         struct dsa_port *dp = dsa_slave_to_port(dev);
1325         struct dsa_switch *ds = dp->ds;
1326
1327         if (!ds->ops->get_rxnfc)
1328                 return -EOPNOTSUPP;
1329
1330         return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1331 }
1332
1333 static int dsa_slave_set_rxnfc(struct net_device *dev,
1334                                struct ethtool_rxnfc *nfc)
1335 {
1336         struct dsa_port *dp = dsa_slave_to_port(dev);
1337         struct dsa_switch *ds = dp->ds;
1338
1339         if (!ds->ops->set_rxnfc)
1340                 return -EOPNOTSUPP;
1341
1342         return ds->ops->set_rxnfc(ds, dp->index, nfc);
1343 }
1344
1345 static int dsa_slave_get_ts_info(struct net_device *dev,
1346                                  struct ethtool_ts_info *ts)
1347 {
1348         struct dsa_slave_priv *p = netdev_priv(dev);
1349         struct dsa_switch *ds = p->dp->ds;
1350
1351         if (!ds->ops->get_ts_info)
1352                 return -EOPNOTSUPP;
1353
1354         return ds->ops->get_ts_info(ds, p->dp->index, ts);
1355 }
1356
1357 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1358                                      u16 vid)
1359 {
1360         struct net_device *master = dsa_slave_to_master(dev);
1361         struct dsa_port *dp = dsa_slave_to_port(dev);
1362         struct switchdev_obj_port_vlan vlan = {
1363                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1364                 .vid = vid,
1365                 /* This API only allows programming tagged, non-PVID VIDs */
1366                 .flags = 0,
1367         };
1368         struct netlink_ext_ack extack = {0};
1369         int ret;
1370
1371         /* User port... */
1372         ret = dsa_port_vlan_add(dp, &vlan, &extack);
1373         if (ret) {
1374                 if (extack._msg)
1375                         netdev_err(dev, "%s\n", extack._msg);
1376                 return ret;
1377         }
1378
1379         /* And CPU port... */
1380         ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &extack);
1381         if (ret) {
1382                 if (extack._msg)
1383                         netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1384                                    extack._msg);
1385                 return ret;
1386         }
1387
1388         return vlan_vid_add(master, proto, vid);
1389 }
1390
1391 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1392                                       u16 vid)
1393 {
1394         struct net_device *master = dsa_slave_to_master(dev);
1395         struct dsa_port *dp = dsa_slave_to_port(dev);
1396         struct switchdev_obj_port_vlan vlan = {
1397                 .vid = vid,
1398                 /* This API only allows programming tagged, non-PVID VIDs */
1399                 .flags = 0,
1400         };
1401         int err;
1402
1403         /* Do not deprogram the CPU port as it may be shared with other user
1404          * ports which can be members of this VLAN as well.
1405          */
1406         err = dsa_port_vlan_del(dp, &vlan);
1407         if (err)
1408                 return err;
1409
1410         vlan_vid_del(master, proto, vid);
1411
1412         return 0;
1413 }
1414
1415 struct dsa_hw_port {
1416         struct list_head list;
1417         struct net_device *dev;
1418         int old_mtu;
1419 };
1420
1421 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1422 {
1423         const struct dsa_hw_port *p;
1424         int err;
1425
1426         list_for_each_entry(p, hw_port_list, list) {
1427                 if (p->dev->mtu == mtu)
1428                         continue;
1429
1430                 err = dev_set_mtu(p->dev, mtu);
1431                 if (err)
1432                         goto rollback;
1433         }
1434
1435         return 0;
1436
1437 rollback:
1438         list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1439                 if (p->dev->mtu == p->old_mtu)
1440                         continue;
1441
1442                 if (dev_set_mtu(p->dev, p->old_mtu))
1443                         netdev_err(p->dev, "Failed to restore MTU\n");
1444         }
1445
1446         return err;
1447 }
1448
1449 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1450 {
1451         struct dsa_hw_port *p, *n;
1452
1453         list_for_each_entry_safe(p, n, hw_port_list, list)
1454                 kfree(p);
1455 }
1456
1457 /* Make the hardware datapath to/from @dev limited to a common MTU */
1458 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1459 {
1460         struct list_head hw_port_list;
1461         struct dsa_switch_tree *dst;
1462         int min_mtu = ETH_MAX_MTU;
1463         struct dsa_port *other_dp;
1464         int err;
1465
1466         if (!dp->ds->mtu_enforcement_ingress)
1467                 return;
1468
1469         if (!dp->bridge_dev)
1470                 return;
1471
1472         INIT_LIST_HEAD(&hw_port_list);
1473
1474         /* Populate the list of ports that are part of the same bridge
1475          * as the newly added/modified port
1476          */
1477         list_for_each_entry(dst, &dsa_tree_list, list) {
1478                 list_for_each_entry(other_dp, &dst->ports, list) {
1479                         struct dsa_hw_port *hw_port;
1480                         struct net_device *slave;
1481
1482                         if (other_dp->type != DSA_PORT_TYPE_USER)
1483                                 continue;
1484
1485                         if (other_dp->bridge_dev != dp->bridge_dev)
1486                                 continue;
1487
1488                         if (!other_dp->ds->mtu_enforcement_ingress)
1489                                 continue;
1490
1491                         slave = other_dp->slave;
1492
1493                         if (min_mtu > slave->mtu)
1494                                 min_mtu = slave->mtu;
1495
1496                         hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1497                         if (!hw_port)
1498                                 goto out;
1499
1500                         hw_port->dev = slave;
1501                         hw_port->old_mtu = slave->mtu;
1502
1503                         list_add(&hw_port->list, &hw_port_list);
1504                 }
1505         }
1506
1507         /* Attempt to configure the entire hardware bridge to the newly added
1508          * interface's MTU first, regardless of whether the intention of the
1509          * user was to raise or lower it.
1510          */
1511         err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1512         if (!err)
1513                 goto out;
1514
1515         /* Clearly that didn't work out so well, so just set the minimum MTU on
1516          * all hardware bridge ports now. If this fails too, then all ports will
1517          * still have their old MTU rolled back anyway.
1518          */
1519         dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1520
1521 out:
1522         dsa_hw_port_list_free(&hw_port_list);
1523 }
1524
1525 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1526 {
1527         struct net_device *master = dsa_slave_to_master(dev);
1528         struct dsa_port *dp = dsa_slave_to_port(dev);
1529         struct dsa_slave_priv *p = netdev_priv(dev);
1530         struct dsa_switch *ds = p->dp->ds;
1531         struct dsa_port *cpu_dp;
1532         int port = p->dp->index;
1533         int largest_mtu = 0;
1534         int new_master_mtu;
1535         int old_master_mtu;
1536         int mtu_limit;
1537         int cpu_mtu;
1538         int err, i;
1539
1540         if (!ds->ops->port_change_mtu)
1541                 return -EOPNOTSUPP;
1542
1543         for (i = 0; i < ds->num_ports; i++) {
1544                 int slave_mtu;
1545
1546                 if (!dsa_is_user_port(ds, i))
1547                         continue;
1548
1549                 /* During probe, this function will be called for each slave
1550                  * device, while not all of them have been allocated. That's
1551                  * ok, it doesn't change what the maximum is, so ignore it.
1552                  */
1553                 if (!dsa_to_port(ds, i)->slave)
1554                         continue;
1555
1556                 /* Pretend that we already applied the setting, which we
1557                  * actually haven't (still haven't done all integrity checks)
1558                  */
1559                 if (i == port)
1560                         slave_mtu = new_mtu;
1561                 else
1562                         slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1563
1564                 if (largest_mtu < slave_mtu)
1565                         largest_mtu = slave_mtu;
1566         }
1567
1568         cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1569
1570         mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1571         old_master_mtu = master->mtu;
1572         new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1573         if (new_master_mtu > mtu_limit)
1574                 return -ERANGE;
1575
1576         /* If the master MTU isn't over limit, there's no need to check the CPU
1577          * MTU, since that surely isn't either.
1578          */
1579         cpu_mtu = largest_mtu;
1580
1581         /* Start applying stuff */
1582         if (new_master_mtu != old_master_mtu) {
1583                 err = dev_set_mtu(master, new_master_mtu);
1584                 if (err < 0)
1585                         goto out_master_failed;
1586
1587                 /* We only need to propagate the MTU of the CPU port to
1588                  * upstream switches.
1589                  */
1590                 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1591                 if (err)
1592                         goto out_cpu_failed;
1593         }
1594
1595         err = dsa_port_mtu_change(dp, new_mtu, false);
1596         if (err)
1597                 goto out_port_failed;
1598
1599         dev->mtu = new_mtu;
1600
1601         dsa_bridge_mtu_normalization(dp);
1602
1603         return 0;
1604
1605 out_port_failed:
1606         if (new_master_mtu != old_master_mtu)
1607                 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1608                                     cpu_dp->tag_ops->overhead,
1609                                     true);
1610 out_cpu_failed:
1611         if (new_master_mtu != old_master_mtu)
1612                 dev_set_mtu(master, old_master_mtu);
1613 out_master_failed:
1614         return err;
1615 }
1616
1617 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1618         .get_drvinfo            = dsa_slave_get_drvinfo,
1619         .get_regs_len           = dsa_slave_get_regs_len,
1620         .get_regs               = dsa_slave_get_regs,
1621         .nway_reset             = dsa_slave_nway_reset,
1622         .get_link               = ethtool_op_get_link,
1623         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1624         .get_eeprom             = dsa_slave_get_eeprom,
1625         .set_eeprom             = dsa_slave_set_eeprom,
1626         .get_strings            = dsa_slave_get_strings,
1627         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1628         .get_sset_count         = dsa_slave_get_sset_count,
1629         .set_wol                = dsa_slave_set_wol,
1630         .get_wol                = dsa_slave_get_wol,
1631         .set_eee                = dsa_slave_set_eee,
1632         .get_eee                = dsa_slave_get_eee,
1633         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1634         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1635         .get_pauseparam         = dsa_slave_get_pauseparam,
1636         .set_pauseparam         = dsa_slave_set_pauseparam,
1637         .get_rxnfc              = dsa_slave_get_rxnfc,
1638         .set_rxnfc              = dsa_slave_set_rxnfc,
1639         .get_ts_info            = dsa_slave_get_ts_info,
1640         .self_test              = dsa_slave_net_selftest,
1641 };
1642
1643 /* legacy way, bypassing the bridge *****************************************/
1644 static int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1645                               struct net_device *dev,
1646                               const unsigned char *addr, u16 vid,
1647                               u16 flags,
1648                               struct netlink_ext_ack *extack)
1649 {
1650         struct dsa_port *dp = dsa_slave_to_port(dev);
1651
1652         return dsa_port_fdb_add(dp, addr, vid);
1653 }
1654
1655 static int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1656                               struct net_device *dev,
1657                               const unsigned char *addr, u16 vid)
1658 {
1659         struct dsa_port *dp = dsa_slave_to_port(dev);
1660
1661         return dsa_port_fdb_del(dp, addr, vid);
1662 }
1663
1664 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1665 {
1666         struct dsa_port *dp = dsa_slave_to_port(dev);
1667
1668         return dp->ds->devlink ? &dp->devlink_port : NULL;
1669 }
1670
1671 static void dsa_slave_get_stats64(struct net_device *dev,
1672                                   struct rtnl_link_stats64 *s)
1673 {
1674         struct dsa_port *dp = dsa_slave_to_port(dev);
1675         struct dsa_switch *ds = dp->ds;
1676
1677         if (ds->ops->get_stats64)
1678                 ds->ops->get_stats64(ds, dp->index, s);
1679         else
1680                 dev_get_tstats64(dev, s);
1681 }
1682
1683 static int dsa_slave_fill_forward_path(struct net_device_path_ctx *ctx,
1684                                        struct net_device_path *path)
1685 {
1686         struct dsa_port *dp = dsa_slave_to_port(ctx->dev);
1687         struct dsa_port *cpu_dp = dp->cpu_dp;
1688
1689         path->dev = ctx->dev;
1690         path->type = DEV_PATH_DSA;
1691         path->dsa.proto = cpu_dp->tag_ops->proto;
1692         path->dsa.port = dp->index;
1693         ctx->dev = cpu_dp->master;
1694
1695         return 0;
1696 }
1697
1698 static const struct net_device_ops dsa_slave_netdev_ops = {
1699         .ndo_open               = dsa_slave_open,
1700         .ndo_stop               = dsa_slave_close,
1701         .ndo_start_xmit         = dsa_slave_xmit,
1702         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1703         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1704         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1705         .ndo_fdb_add            = dsa_legacy_fdb_add,
1706         .ndo_fdb_del            = dsa_legacy_fdb_del,
1707         .ndo_fdb_dump           = dsa_slave_fdb_dump,
1708         .ndo_do_ioctl           = dsa_slave_ioctl,
1709         .ndo_get_iflink         = dsa_slave_get_iflink,
1710 #ifdef CONFIG_NET_POLL_CONTROLLER
1711         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1712         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1713         .ndo_poll_controller    = dsa_slave_poll_controller,
1714 #endif
1715         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1716         .ndo_setup_tc           = dsa_slave_setup_tc,
1717         .ndo_get_stats64        = dsa_slave_get_stats64,
1718         .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1719         .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
1720         .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
1721         .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
1722         .ndo_change_mtu         = dsa_slave_change_mtu,
1723         .ndo_fill_forward_path  = dsa_slave_fill_forward_path,
1724 };
1725
1726 static struct device_type dsa_type = {
1727         .name   = "dsa",
1728 };
1729
1730 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1731 {
1732         const struct dsa_port *dp = dsa_to_port(ds, port);
1733
1734         if (dp->pl)
1735                 phylink_mac_change(dp->pl, up);
1736 }
1737 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1738
1739 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1740                                           struct phylink_link_state *state)
1741 {
1742         struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1743         struct dsa_switch *ds = dp->ds;
1744
1745         /* No need to check that this operation is valid, the callback would
1746          * not be called if it was not.
1747          */
1748         ds->ops->phylink_fixed_state(ds, dp->index, state);
1749 }
1750
1751 /* slave device setup *******************************************************/
1752 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1753 {
1754         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1755         struct dsa_switch *ds = dp->ds;
1756
1757         slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1758         if (!slave_dev->phydev) {
1759                 netdev_err(slave_dev, "no phy at %d\n", addr);
1760                 return -ENODEV;
1761         }
1762
1763         return phylink_connect_phy(dp->pl, slave_dev->phydev);
1764 }
1765
1766 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1767 {
1768         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1769         struct device_node *port_dn = dp->dn;
1770         struct dsa_switch *ds = dp->ds;
1771         phy_interface_t mode;
1772         u32 phy_flags = 0;
1773         int ret;
1774
1775         ret = of_get_phy_mode(port_dn, &mode);
1776         if (ret)
1777                 mode = PHY_INTERFACE_MODE_NA;
1778
1779         dp->pl_config.dev = &slave_dev->dev;
1780         dp->pl_config.type = PHYLINK_NETDEV;
1781
1782         /* The get_fixed_state callback takes precedence over polling the
1783          * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1784          * this if the switch provides such a callback.
1785          */
1786         if (ds->ops->phylink_fixed_state) {
1787                 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1788                 dp->pl_config.poll_fixed_state = true;
1789         }
1790
1791         dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1792                                 &dsa_port_phylink_mac_ops);
1793         if (IS_ERR(dp->pl)) {
1794                 netdev_err(slave_dev,
1795                            "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1796                 return PTR_ERR(dp->pl);
1797         }
1798
1799         if (ds->ops->get_phy_flags)
1800                 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1801
1802         ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1803         if (ret == -ENODEV && ds->slave_mii_bus) {
1804                 /* We could not connect to a designated PHY or SFP, so try to
1805                  * use the switch internal MDIO bus instead
1806                  */
1807                 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1808                 if (ret) {
1809                         netdev_err(slave_dev,
1810                                    "failed to connect to port %d: %d\n",
1811                                    dp->index, ret);
1812                         phylink_destroy(dp->pl);
1813                         return ret;
1814                 }
1815         }
1816
1817         return ret;
1818 }
1819
1820 void dsa_slave_setup_tagger(struct net_device *slave)
1821 {
1822         struct dsa_port *dp = dsa_slave_to_port(slave);
1823         struct dsa_slave_priv *p = netdev_priv(slave);
1824         const struct dsa_port *cpu_dp = dp->cpu_dp;
1825         struct net_device *master = cpu_dp->master;
1826
1827         if (cpu_dp->tag_ops->tail_tag)
1828                 slave->needed_tailroom = cpu_dp->tag_ops->overhead;
1829         else
1830                 slave->needed_headroom = cpu_dp->tag_ops->overhead;
1831         /* Try to save one extra realloc later in the TX path (in the master)
1832          * by also inheriting the master's needed headroom and tailroom.
1833          * The 8021q driver also does this.
1834          */
1835         slave->needed_headroom += master->needed_headroom;
1836         slave->needed_tailroom += master->needed_tailroom;
1837
1838         p->xmit = cpu_dp->tag_ops->xmit;
1839 }
1840
1841 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1842 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1843                                             struct netdev_queue *txq,
1844                                             void *_unused)
1845 {
1846         lockdep_set_class(&txq->_xmit_lock,
1847                           &dsa_slave_netdev_xmit_lock_key);
1848 }
1849
1850 int dsa_slave_suspend(struct net_device *slave_dev)
1851 {
1852         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1853
1854         if (!netif_running(slave_dev))
1855                 return 0;
1856
1857         netif_device_detach(slave_dev);
1858
1859         rtnl_lock();
1860         phylink_stop(dp->pl);
1861         rtnl_unlock();
1862
1863         return 0;
1864 }
1865
1866 int dsa_slave_resume(struct net_device *slave_dev)
1867 {
1868         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1869
1870         if (!netif_running(slave_dev))
1871                 return 0;
1872
1873         netif_device_attach(slave_dev);
1874
1875         rtnl_lock();
1876         phylink_start(dp->pl);
1877         rtnl_unlock();
1878
1879         return 0;
1880 }
1881
1882 int dsa_slave_create(struct dsa_port *port)
1883 {
1884         const struct dsa_port *cpu_dp = port->cpu_dp;
1885         struct net_device *master = cpu_dp->master;
1886         struct dsa_switch *ds = port->ds;
1887         const char *name = port->name;
1888         struct net_device *slave_dev;
1889         struct dsa_slave_priv *p;
1890         int ret;
1891
1892         if (!ds->num_tx_queues)
1893                 ds->num_tx_queues = 1;
1894
1895         slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1896                                      NET_NAME_UNKNOWN, ether_setup,
1897                                      ds->num_tx_queues, 1);
1898         if (slave_dev == NULL)
1899                 return -ENOMEM;
1900
1901         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1902         if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1903                 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1904         slave_dev->hw_features |= NETIF_F_HW_TC;
1905         slave_dev->features |= NETIF_F_LLTX;
1906         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1907         if (!is_zero_ether_addr(port->mac))
1908                 ether_addr_copy(slave_dev->dev_addr, port->mac);
1909         else
1910                 eth_hw_addr_inherit(slave_dev, master);
1911         slave_dev->priv_flags |= IFF_NO_QUEUE;
1912         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1913         if (ds->ops->port_max_mtu)
1914                 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1915         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1916
1917         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1918                                  NULL);
1919
1920         SET_NETDEV_DEV(slave_dev, port->ds->dev);
1921         slave_dev->dev.of_node = port->dn;
1922         slave_dev->vlan_features = master->vlan_features;
1923
1924         p = netdev_priv(slave_dev);
1925         slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1926         if (!slave_dev->tstats) {
1927                 free_netdev(slave_dev);
1928                 return -ENOMEM;
1929         }
1930
1931         ret = gro_cells_init(&p->gcells, slave_dev);
1932         if (ret)
1933                 goto out_free;
1934
1935         p->dp = port;
1936         INIT_LIST_HEAD(&p->mall_tc_list);
1937         port->slave = slave_dev;
1938         dsa_slave_setup_tagger(slave_dev);
1939
1940         rtnl_lock();
1941         ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1942         rtnl_unlock();
1943         if (ret && ret != -EOPNOTSUPP)
1944                 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1945                          ret, ETH_DATA_LEN, port->index);
1946
1947         netif_carrier_off(slave_dev);
1948
1949         ret = dsa_slave_phy_setup(slave_dev);
1950         if (ret) {
1951                 netdev_err(slave_dev,
1952                            "error %d setting up PHY for tree %d, switch %d, port %d\n",
1953                            ret, ds->dst->index, ds->index, port->index);
1954                 goto out_gcells;
1955         }
1956
1957         rtnl_lock();
1958
1959         ret = register_netdevice(slave_dev);
1960         if (ret) {
1961                 netdev_err(master, "error %d registering interface %s\n",
1962                            ret, slave_dev->name);
1963                 rtnl_unlock();
1964                 goto out_phy;
1965         }
1966
1967         ret = netdev_upper_dev_link(master, slave_dev, NULL);
1968
1969         rtnl_unlock();
1970
1971         if (ret)
1972                 goto out_unregister;
1973
1974         return 0;
1975
1976 out_unregister:
1977         unregister_netdev(slave_dev);
1978 out_phy:
1979         rtnl_lock();
1980         phylink_disconnect_phy(p->dp->pl);
1981         rtnl_unlock();
1982         phylink_destroy(p->dp->pl);
1983 out_gcells:
1984         gro_cells_destroy(&p->gcells);
1985 out_free:
1986         free_percpu(slave_dev->tstats);
1987         free_netdev(slave_dev);
1988         port->slave = NULL;
1989         return ret;
1990 }
1991
1992 void dsa_slave_destroy(struct net_device *slave_dev)
1993 {
1994         struct net_device *master = dsa_slave_to_master(slave_dev);
1995         struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1996         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1997
1998         netif_carrier_off(slave_dev);
1999         rtnl_lock();
2000         netdev_upper_dev_unlink(master, slave_dev);
2001         unregister_netdevice(slave_dev);
2002         phylink_disconnect_phy(dp->pl);
2003         rtnl_unlock();
2004
2005         phylink_destroy(dp->pl);
2006         gro_cells_destroy(&p->gcells);
2007         free_percpu(slave_dev->tstats);
2008         free_netdev(slave_dev);
2009 }
2010
2011 bool dsa_slave_dev_check(const struct net_device *dev)
2012 {
2013         return dev->netdev_ops == &dsa_slave_netdev_ops;
2014 }
2015 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
2016
2017 static int dsa_slave_changeupper(struct net_device *dev,
2018                                  struct netdev_notifier_changeupper_info *info)
2019 {
2020         struct dsa_port *dp = dsa_slave_to_port(dev);
2021         struct netlink_ext_ack *extack;
2022         int err = NOTIFY_DONE;
2023
2024         extack = netdev_notifier_info_to_extack(&info->info);
2025
2026         if (netif_is_bridge_master(info->upper_dev)) {
2027                 if (info->linking) {
2028                         err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2029                         if (!err)
2030                                 dsa_bridge_mtu_normalization(dp);
2031                         err = notifier_from_errno(err);
2032                 } else {
2033                         dsa_port_bridge_leave(dp, info->upper_dev);
2034                         err = NOTIFY_OK;
2035                 }
2036         } else if (netif_is_lag_master(info->upper_dev)) {
2037                 if (info->linking) {
2038                         err = dsa_port_lag_join(dp, info->upper_dev,
2039                                                 info->upper_info, extack);
2040                         if (err == -EOPNOTSUPP) {
2041                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2042                                                    "Offloading not supported");
2043                                 err = 0;
2044                         }
2045                         err = notifier_from_errno(err);
2046                 } else {
2047                         dsa_port_lag_leave(dp, info->upper_dev);
2048                         err = NOTIFY_OK;
2049                 }
2050         } else if (is_hsr_master(info->upper_dev)) {
2051                 if (info->linking) {
2052                         err = dsa_port_hsr_join(dp, info->upper_dev);
2053                         if (err == -EOPNOTSUPP) {
2054                                 NL_SET_ERR_MSG_MOD(info->info.extack,
2055                                                    "Offloading not supported");
2056                                 err = 0;
2057                         }
2058                         err = notifier_from_errno(err);
2059                 } else {
2060                         dsa_port_hsr_leave(dp, info->upper_dev);
2061                         err = NOTIFY_OK;
2062                 }
2063         }
2064
2065         return err;
2066 }
2067
2068 static int
2069 dsa_slave_lag_changeupper(struct net_device *dev,
2070                           struct netdev_notifier_changeupper_info *info)
2071 {
2072         struct net_device *lower;
2073         struct list_head *iter;
2074         int err = NOTIFY_DONE;
2075         struct dsa_port *dp;
2076
2077         netdev_for_each_lower_dev(dev, lower, iter) {
2078                 if (!dsa_slave_dev_check(lower))
2079                         continue;
2080
2081                 dp = dsa_slave_to_port(lower);
2082                 if (!dp->lag_dev)
2083                         /* Software LAG */
2084                         continue;
2085
2086                 err = dsa_slave_changeupper(lower, info);
2087                 if (notifier_to_errno(err))
2088                         break;
2089         }
2090
2091         return err;
2092 }
2093
2094 static int
2095 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2096                                  struct netdev_notifier_changeupper_info *info)
2097 {
2098         struct netlink_ext_ack *ext_ack;
2099         struct net_device *slave;
2100         struct dsa_port *dp;
2101
2102         ext_ack = netdev_notifier_info_to_extack(&info->info);
2103
2104         if (!is_vlan_dev(dev))
2105                 return NOTIFY_DONE;
2106
2107         slave = vlan_dev_real_dev(dev);
2108         if (!dsa_slave_dev_check(slave))
2109                 return NOTIFY_DONE;
2110
2111         dp = dsa_slave_to_port(slave);
2112         if (!dp->bridge_dev)
2113                 return NOTIFY_DONE;
2114
2115         /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2116         if (br_vlan_enabled(dp->bridge_dev) &&
2117             netif_is_bridge_master(info->upper_dev) && info->linking) {
2118                 NL_SET_ERR_MSG_MOD(ext_ack,
2119                                    "Cannot enslave VLAN device into VLAN aware bridge");
2120                 return notifier_from_errno(-EINVAL);
2121         }
2122
2123         return NOTIFY_DONE;
2124 }
2125
2126 static int
2127 dsa_slave_check_8021q_upper(struct net_device *dev,
2128                             struct netdev_notifier_changeupper_info *info)
2129 {
2130         struct dsa_port *dp = dsa_slave_to_port(dev);
2131         struct net_device *br = dp->bridge_dev;
2132         struct bridge_vlan_info br_info;
2133         struct netlink_ext_ack *extack;
2134         int err = NOTIFY_DONE;
2135         u16 vid;
2136
2137         if (!br || !br_vlan_enabled(br))
2138                 return NOTIFY_DONE;
2139
2140         extack = netdev_notifier_info_to_extack(&info->info);
2141         vid = vlan_dev_vlan_id(info->upper_dev);
2142
2143         /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2144          * device, respectively the VID is not found, returning
2145          * 0 means success, which is a failure for us here.
2146          */
2147         err = br_vlan_get_info(br, vid, &br_info);
2148         if (err == 0) {
2149                 NL_SET_ERR_MSG_MOD(extack,
2150                                    "This VLAN is already configured by the bridge");
2151                 return notifier_from_errno(-EBUSY);
2152         }
2153
2154         return NOTIFY_DONE;
2155 }
2156
2157 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2158                                      unsigned long event, void *ptr)
2159 {
2160         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2161
2162         switch (event) {
2163         case NETDEV_PRECHANGEUPPER: {
2164                 struct netdev_notifier_changeupper_info *info = ptr;
2165                 struct dsa_switch *ds;
2166                 struct dsa_port *dp;
2167                 int err;
2168
2169                 if (!dsa_slave_dev_check(dev))
2170                         return dsa_prevent_bridging_8021q_upper(dev, ptr);
2171
2172                 dp = dsa_slave_to_port(dev);
2173                 ds = dp->ds;
2174
2175                 if (ds->ops->port_prechangeupper) {
2176                         err = ds->ops->port_prechangeupper(ds, dp->index, info);
2177                         if (err)
2178                                 return notifier_from_errno(err);
2179                 }
2180
2181                 if (is_vlan_dev(info->upper_dev))
2182                         return dsa_slave_check_8021q_upper(dev, ptr);
2183                 break;
2184         }
2185         case NETDEV_CHANGEUPPER:
2186                 if (dsa_slave_dev_check(dev))
2187                         return dsa_slave_changeupper(dev, ptr);
2188
2189                 if (netif_is_lag_master(dev))
2190                         return dsa_slave_lag_changeupper(dev, ptr);
2191
2192                 break;
2193         case NETDEV_CHANGELOWERSTATE: {
2194                 struct netdev_notifier_changelowerstate_info *info = ptr;
2195                 struct dsa_port *dp;
2196                 int err;
2197
2198                 if (!dsa_slave_dev_check(dev))
2199                         break;
2200
2201                 dp = dsa_slave_to_port(dev);
2202
2203                 err = dsa_port_lag_change(dp, info->lower_state_info);
2204                 return notifier_from_errno(err);
2205         }
2206         case NETDEV_GOING_DOWN: {
2207                 struct dsa_port *dp, *cpu_dp;
2208                 struct dsa_switch_tree *dst;
2209                 LIST_HEAD(close_list);
2210
2211                 if (!netdev_uses_dsa(dev))
2212                         return NOTIFY_DONE;
2213
2214                 cpu_dp = dev->dsa_ptr;
2215                 dst = cpu_dp->ds->dst;
2216
2217                 list_for_each_entry(dp, &dst->ports, list) {
2218                         if (!dsa_is_user_port(dp->ds, dp->index))
2219                                 continue;
2220
2221                         list_add(&dp->slave->close_list, &close_list);
2222                 }
2223
2224                 dev_close_many(&close_list, true);
2225
2226                 return NOTIFY_OK;
2227         }
2228         default:
2229                 break;
2230         }
2231
2232         return NOTIFY_DONE;
2233 }
2234
2235 static void
2236 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2237 {
2238         struct dsa_switch *ds = switchdev_work->ds;
2239         struct switchdev_notifier_fdb_info info;
2240         struct dsa_port *dp;
2241
2242         if (!dsa_is_user_port(ds, switchdev_work->port))
2243                 return;
2244
2245         info.addr = switchdev_work->addr;
2246         info.vid = switchdev_work->vid;
2247         info.offloaded = true;
2248         dp = dsa_to_port(ds, switchdev_work->port);
2249         call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2250                                  dp->slave, &info.info, NULL);
2251 }
2252
2253 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2254 {
2255         struct dsa_switchdev_event_work *switchdev_work =
2256                 container_of(work, struct dsa_switchdev_event_work, work);
2257         struct dsa_switch *ds = switchdev_work->ds;
2258         struct dsa_port *dp;
2259         int err;
2260
2261         dp = dsa_to_port(ds, switchdev_work->port);
2262
2263         rtnl_lock();
2264         switch (switchdev_work->event) {
2265         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2266                 err = dsa_port_fdb_add(dp, switchdev_work->addr,
2267                                        switchdev_work->vid);
2268                 if (err) {
2269                         dev_err(ds->dev,
2270                                 "port %d failed to add %pM vid %d to fdb: %d\n",
2271                                 dp->index, switchdev_work->addr,
2272                                 switchdev_work->vid, err);
2273                         break;
2274                 }
2275                 dsa_fdb_offload_notify(switchdev_work);
2276                 break;
2277
2278         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2279                 err = dsa_port_fdb_del(dp, switchdev_work->addr,
2280                                        switchdev_work->vid);
2281                 if (err) {
2282                         dev_err(ds->dev,
2283                                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2284                                 dp->index, switchdev_work->addr,
2285                                 switchdev_work->vid, err);
2286                 }
2287
2288                 break;
2289         }
2290         rtnl_unlock();
2291
2292         kfree(switchdev_work);
2293         if (dsa_is_user_port(ds, dp->index))
2294                 dev_put(dp->slave);
2295 }
2296
2297 static int dsa_lower_dev_walk(struct net_device *lower_dev,
2298                               struct netdev_nested_priv *priv)
2299 {
2300         if (dsa_slave_dev_check(lower_dev)) {
2301                 priv->data = (void *)netdev_priv(lower_dev);
2302                 return 1;
2303         }
2304
2305         return 0;
2306 }
2307
2308 static struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev)
2309 {
2310         struct netdev_nested_priv priv = {
2311                 .data = NULL,
2312         };
2313
2314         netdev_walk_all_lower_dev_rcu(dev, dsa_lower_dev_walk, &priv);
2315
2316         return (struct dsa_slave_priv *)priv.data;
2317 }
2318
2319 /* Called under rcu_read_lock() */
2320 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2321                                      unsigned long event, void *ptr)
2322 {
2323         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2324         const struct switchdev_notifier_fdb_info *fdb_info;
2325         struct dsa_switchdev_event_work *switchdev_work;
2326         struct dsa_port *dp;
2327         int err;
2328
2329         switch (event) {
2330         case SWITCHDEV_PORT_ATTR_SET:
2331                 err = switchdev_handle_port_attr_set(dev, ptr,
2332                                                      dsa_slave_dev_check,
2333                                                      dsa_slave_port_attr_set);
2334                 return notifier_from_errno(err);
2335         case SWITCHDEV_FDB_ADD_TO_DEVICE:
2336         case SWITCHDEV_FDB_DEL_TO_DEVICE:
2337                 fdb_info = ptr;
2338
2339                 if (dsa_slave_dev_check(dev)) {
2340                         if (!fdb_info->added_by_user || fdb_info->is_local)
2341                                 return NOTIFY_OK;
2342
2343                         dp = dsa_slave_to_port(dev);
2344                 } else {
2345                         /* Snoop addresses learnt on foreign interfaces
2346                          * bridged with us, for switches that don't
2347                          * automatically learn SA from CPU-injected traffic
2348                          */
2349                         struct net_device *br_dev;
2350                         struct dsa_slave_priv *p;
2351
2352                         br_dev = netdev_master_upper_dev_get_rcu(dev);
2353                         if (!br_dev)
2354                                 return NOTIFY_DONE;
2355
2356                         if (!netif_is_bridge_master(br_dev))
2357                                 return NOTIFY_DONE;
2358
2359                         p = dsa_slave_dev_lower_find(br_dev);
2360                         if (!p)
2361                                 return NOTIFY_DONE;
2362
2363                         dp = p->dp->cpu_dp;
2364
2365                         if (!dp->ds->assisted_learning_on_cpu_port)
2366                                 return NOTIFY_DONE;
2367
2368                         /* When the bridge learns an address on an offloaded
2369                          * LAG we don't want to send traffic to the CPU, the
2370                          * other ports bridged with the LAG should be able to
2371                          * autonomously forward towards it.
2372                          */
2373                         if (dsa_tree_offloads_bridge_port(dp->ds->dst, dev))
2374                                 return NOTIFY_DONE;
2375                 }
2376
2377                 if (!dp->ds->ops->port_fdb_add || !dp->ds->ops->port_fdb_del)
2378                         return NOTIFY_DONE;
2379
2380                 switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2381                 if (!switchdev_work)
2382                         return NOTIFY_BAD;
2383
2384                 INIT_WORK(&switchdev_work->work,
2385                           dsa_slave_switchdev_event_work);
2386                 switchdev_work->ds = dp->ds;
2387                 switchdev_work->port = dp->index;
2388                 switchdev_work->event = event;
2389
2390                 ether_addr_copy(switchdev_work->addr,
2391                                 fdb_info->addr);
2392                 switchdev_work->vid = fdb_info->vid;
2393
2394                 /* Hold a reference on the slave for dsa_fdb_offload_notify */
2395                 if (dsa_is_user_port(dp->ds, dp->index))
2396                         dev_hold(dev);
2397                 dsa_schedule_work(&switchdev_work->work);
2398                 break;
2399         default:
2400                 return NOTIFY_DONE;
2401         }
2402
2403         return NOTIFY_OK;
2404 }
2405
2406 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2407                                               unsigned long event, void *ptr)
2408 {
2409         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2410         int err;
2411
2412         switch (event) {
2413         case SWITCHDEV_PORT_OBJ_ADD:
2414                 err = switchdev_handle_port_obj_add(dev, ptr,
2415                                                     dsa_slave_dev_check,
2416                                                     dsa_slave_port_obj_add);
2417                 return notifier_from_errno(err);
2418         case SWITCHDEV_PORT_OBJ_DEL:
2419                 err = switchdev_handle_port_obj_del(dev, ptr,
2420                                                     dsa_slave_dev_check,
2421                                                     dsa_slave_port_obj_del);
2422                 return notifier_from_errno(err);
2423         case SWITCHDEV_PORT_ATTR_SET:
2424                 err = switchdev_handle_port_attr_set(dev, ptr,
2425                                                      dsa_slave_dev_check,
2426                                                      dsa_slave_port_attr_set);
2427                 return notifier_from_errno(err);
2428         }
2429
2430         return NOTIFY_DONE;
2431 }
2432
2433 static struct notifier_block dsa_slave_nb __read_mostly = {
2434         .notifier_call  = dsa_slave_netdevice_event,
2435 };
2436
2437 struct notifier_block dsa_slave_switchdev_notifier = {
2438         .notifier_call = dsa_slave_switchdev_event,
2439 };
2440
2441 struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2442         .notifier_call = dsa_slave_switchdev_blocking_event,
2443 };
2444
2445 int dsa_slave_register_notifier(void)
2446 {
2447         struct notifier_block *nb;
2448         int err;
2449
2450         err = register_netdevice_notifier(&dsa_slave_nb);
2451         if (err)
2452                 return err;
2453
2454         err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2455         if (err)
2456                 goto err_switchdev_nb;
2457
2458         nb = &dsa_slave_switchdev_blocking_notifier;
2459         err = register_switchdev_blocking_notifier(nb);
2460         if (err)
2461                 goto err_switchdev_blocking_nb;
2462
2463         return 0;
2464
2465 err_switchdev_blocking_nb:
2466         unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2467 err_switchdev_nb:
2468         unregister_netdevice_notifier(&dsa_slave_nb);
2469         return err;
2470 }
2471
2472 void dsa_slave_unregister_notifier(void)
2473 {
2474         struct notifier_block *nb;
2475         int err;
2476
2477         nb = &dsa_slave_switchdev_blocking_notifier;
2478         err = unregister_switchdev_blocking_notifier(nb);
2479         if (err)
2480                 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2481
2482         err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2483         if (err)
2484                 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2485
2486         err = unregister_netdevice_notifier(&dsa_slave_nb);
2487         if (err)
2488                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2489 }