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 ***************************************************/
  27static 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
  37static 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
  47void 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 ****************************************************/
  61static int dsa_slave_get_iflink(const struct net_device *dev)
  62{
  63	return dsa_slave_to_master(dev)->ifindex;
  64}
  65
  66static 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
 101clear_promisc:
 102	if (dev->flags & IFF_PROMISC)
 103		dev_set_promiscuity(master, -1);
 104clear_allmulti:
 105	if (dev->flags & IFF_ALLMULTI)
 106		dev_set_allmulti(master, -1);
 107del_unicast:
 108	if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 109		dev_uc_del(master, dev->dev_addr);
 
 
 
 110out:
 111	return err;
 112}
 113
 114static 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
 
 
 
 
 
 
 
 
 
 134static 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
 147static 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
 155static 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
 176out:
 177	ether_addr_copy(dev->dev_addr, addr->sa_data);
 
 
 
 178
 179	return 0;
 
 
 
 
 
 
 180}
 181
 182struct dsa_slave_dump_ctx {
 183	struct net_device *dev;
 184	struct sk_buff *skb;
 185	struct netlink_callback *cb;
 186	int idx;
 187};
 188
 189static int
 190dsa_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
 224skip:
 225	dump->idx++;
 226	return 0;
 227
 228nla_put_failure:
 229	nlmsg_cancel(dump->skb, nlh);
 230	return -EMSGSIZE;
 231}
 232
 233static int
 234dsa_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
 253static 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
 274static int dsa_slave_port_attr_set(struct net_device *dev, const void *ctx,
 275				   const struct switchdev_attr *attr,
 276				   struct netlink_ext_ack *extack)
 277{
 278	struct dsa_port *dp = dsa_slave_to_port(dev);
 279	int ret;
 280
 281	if (ctx && ctx != dp)
 282		return 0;
 283
 284	switch (attr->id) {
 285	case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 286		if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 287			return -EOPNOTSUPP;
 288
 289		ret = dsa_port_set_state(dp, attr->u.stp_state);
 
 
 
 
 
 
 290		break;
 291	case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 292		if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 293			return -EOPNOTSUPP;
 294
 295		ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 296					      extack);
 297		break;
 298	case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 299		if (!dsa_port_offloads_bridge(dp, attr->orig_dev))
 300			return -EOPNOTSUPP;
 301
 302		ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
 303		break;
 
 
 
 
 
 
 304	case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 305		if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 306			return -EOPNOTSUPP;
 307
 308		ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 309						extack);
 310		break;
 311	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 312		if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
 313			return -EOPNOTSUPP;
 314
 315		ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
 316		break;
 
 
 
 
 
 
 317	default:
 318		ret = -EOPNOTSUPP;
 319		break;
 320	}
 321
 322	return ret;
 323}
 324
 325/* Must be called under rcu_read_lock() */
 326static int
 327dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
 328				      const struct switchdev_obj_port_vlan *vlan)
 329{
 330	struct net_device *upper_dev;
 331	struct list_head *iter;
 332
 333	netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
 334		u16 vid;
 335
 336		if (!is_vlan_dev(upper_dev))
 337			continue;
 338
 339		vid = vlan_dev_vlan_id(upper_dev);
 340		if (vid == vlan->vid)
 341			return -EBUSY;
 342	}
 343
 344	return 0;
 345}
 346
 347static int dsa_slave_vlan_add(struct net_device *dev,
 348			      const struct switchdev_obj *obj,
 349			      struct netlink_ext_ack *extack)
 350{
 351	struct net_device *master = dsa_slave_to_master(dev);
 352	struct dsa_port *dp = dsa_slave_to_port(dev);
 353	struct switchdev_obj_port_vlan vlan;
 354	int err;
 355
 356	if (dsa_port_skip_vlan_configuration(dp)) {
 357		NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 358		return 0;
 359	}
 360
 361	vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 362
 363	/* Deny adding a bridge VLAN when there is already an 802.1Q upper with
 364	 * the same VID.
 365	 */
 366	if (br_vlan_enabled(dp->bridge_dev)) {
 367		rcu_read_lock();
 368		err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
 369		rcu_read_unlock();
 370		if (err) {
 371			NL_SET_ERR_MSG_MOD(extack,
 372					   "Port already has a VLAN upper with this VID");
 373			return err;
 374		}
 375	}
 376
 377	err = dsa_port_vlan_add(dp, &vlan, extack);
 378	if (err)
 379		return err;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 380
 381	/* We need the dedicated CPU port to be a member of the VLAN as well.
 382	 * Even though drivers often handle CPU membership in special ways,
 383	 * it doesn't make sense to program a PVID, so clear this flag.
 384	 */
 385	vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 386
 387	err = dsa_port_vlan_add(dp->cpu_dp, &vlan, extack);
 388	if (err)
 389		return err;
 390
 391	return vlan_vid_add(master, htons(ETH_P_8021Q), vlan.vid);
 392}
 393
 394static int dsa_slave_port_obj_add(struct net_device *dev, const void *ctx,
 395				  const struct switchdev_obj *obj,
 396				  struct netlink_ext_ack *extack)
 397{
 398	struct dsa_port *dp = dsa_slave_to_port(dev);
 399	int err;
 400
 401	if (ctx && ctx != dp)
 402		return 0;
 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		err = dsa_port_host_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 416		break;
 417	case SWITCHDEV_OBJ_ID_PORT_VLAN:
 418		if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 419			return -EOPNOTSUPP;
 420
 421		err = dsa_slave_vlan_add(dev, obj, extack);
 422		break;
 423	case SWITCHDEV_OBJ_ID_MRP:
 424		if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 425			return -EOPNOTSUPP;
 426
 427		err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
 428		break;
 429	case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 430		if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 431			return -EOPNOTSUPP;
 432
 433		err = dsa_port_mrp_add_ring_role(dp,
 434						 SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 435		break;
 436	default:
 437		err = -EOPNOTSUPP;
 438		break;
 439	}
 440
 441	return err;
 442}
 443
 444static int dsa_slave_vlan_del(struct net_device *dev,
 445			      const struct switchdev_obj *obj)
 446{
 447	struct net_device *master = dsa_slave_to_master(dev);
 448	struct dsa_port *dp = dsa_slave_to_port(dev);
 449	struct switchdev_obj_port_vlan *vlan;
 450	int err;
 451
 452	if (dsa_port_skip_vlan_configuration(dp))
 453		return 0;
 454
 455	vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 456
 457	/* Do not deprogram the CPU port as it may be shared with other user
 458	 * ports which can be members of this VLAN as well.
 459	 */
 460	err = dsa_port_vlan_del(dp, vlan);
 461	if (err)
 462		return err;
 
 
 463
 464	vlan_vid_del(master, htons(ETH_P_8021Q), vlan->vid);
 
 
 465
 466	return 0;
 
 
 
 
 
 467}
 468
 469static int dsa_slave_port_obj_del(struct net_device *dev, const void *ctx,
 470				  const struct switchdev_obj *obj)
 471{
 472	struct dsa_port *dp = dsa_slave_to_port(dev);
 473	int err;
 474
 475	if (ctx && ctx != dp)
 476		return 0;
 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		err = dsa_port_host_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 490		break;
 491	case SWITCHDEV_OBJ_ID_PORT_VLAN:
 492		if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
 493			return -EOPNOTSUPP;
 494
 495		err = dsa_slave_vlan_del(dev, obj);
 496		break;
 497	case SWITCHDEV_OBJ_ID_MRP:
 498		if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 499			return -EOPNOTSUPP;
 500
 501		err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
 502		break;
 503	case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
 504		if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
 505			return -EOPNOTSUPP;
 506
 507		err = dsa_port_mrp_del_ring_role(dp,
 508						 SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
 509		break;
 510	default:
 511		err = -EOPNOTSUPP;
 512		break;
 513	}
 514
 515	return err;
 516}
 517
 518static int dsa_slave_get_port_parent_id(struct net_device *dev,
 519					struct netdev_phys_item_id *ppid)
 520{
 521	struct dsa_port *dp = dsa_slave_to_port(dev);
 522	struct dsa_switch *ds = dp->ds;
 523	struct dsa_switch_tree *dst = ds->dst;
 524
 525	/* For non-legacy ports, devlink is used and it takes
 526	 * care of the name generation. This ndo implementation
 527	 * should be removed with legacy support.
 528	 */
 529	if (dp->ds->devlink)
 530		return -EOPNOTSUPP;
 531
 532	ppid->id_len = sizeof(dst->index);
 533	memcpy(&ppid->id, &dst->index, ppid->id_len);
 534
 535	return 0;
 536}
 537
 538static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 539						     struct sk_buff *skb)
 540{
 541#ifdef CONFIG_NET_POLL_CONTROLLER
 542	struct dsa_slave_priv *p = netdev_priv(dev);
 543
 544	return netpoll_send_skb(p->netpoll, skb);
 545#else
 546	BUG();
 547	return NETDEV_TX_OK;
 548#endif
 549}
 550
 551static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 552				 struct sk_buff *skb)
 553{
 554	struct dsa_switch *ds = p->dp->ds;
 555
 556	if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 557		return;
 558
 559	if (!ds->ops->port_txtstamp)
 560		return;
 561
 562	ds->ops->port_txtstamp(ds, p->dp->index, skb);
 563}
 564
 565netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 566{
 567	/* SKB for netpoll still need to be mangled with the protocol-specific
 568	 * tag to be successfully transmitted
 569	 */
 570	if (unlikely(netpoll_tx_running(dev)))
 571		return dsa_slave_netpoll_send_skb(dev, skb);
 572
 573	/* Queue the SKB for transmission on the parent interface, but
 574	 * do not modify its EtherType
 575	 */
 576	skb->dev = dsa_slave_to_master(dev);
 577	dev_queue_xmit(skb);
 578
 579	return NETDEV_TX_OK;
 580}
 581EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 582
 583static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
 584{
 585	int needed_headroom = dev->needed_headroom;
 586	int needed_tailroom = dev->needed_tailroom;
 587
 588	/* For tail taggers, we need to pad short frames ourselves, to ensure
 589	 * that the tail tag does not fail at its role of being at the end of
 590	 * the packet, once the master interface pads the frame. Account for
 591	 * that pad length here, and pad later.
 592	 */
 593	if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
 594		needed_tailroom += ETH_ZLEN - skb->len;
 595	/* skb_headroom() returns unsigned int... */
 596	needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
 597	needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
 598
 599	if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
 600		/* No reallocation needed, yay! */
 601		return 0;
 602
 603	return pskb_expand_head(skb, needed_headroom, needed_tailroom,
 604				GFP_ATOMIC);
 605}
 606
 607static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 608{
 609	struct dsa_slave_priv *p = netdev_priv(dev);
 610	struct sk_buff *nskb;
 611
 612	dev_sw_netstats_tx_add(dev, 1, skb->len);
 613
 614	memset(skb->cb, 0, sizeof(skb->cb));
 615
 616	/* Handle tx timestamp if any */
 617	dsa_skb_tx_timestamp(p, skb);
 618
 619	if (dsa_realloc_skb(skb, dev)) {
 620		dev_kfree_skb_any(skb);
 621		return NETDEV_TX_OK;
 622	}
 623
 624	/* needed_tailroom should still be 'warm' in the cache line from
 625	 * dsa_realloc_skb(), which has also ensured that padding is safe.
 626	 */
 627	if (dev->needed_tailroom)
 628		eth_skb_pad(skb);
 629
 630	/* Transmit function may have to reallocate the original SKB,
 631	 * in which case it must have freed it. Only free it here on error.
 632	 */
 633	nskb = p->xmit(skb, dev);
 634	if (!nskb) {
 635		kfree_skb(skb);
 636		return NETDEV_TX_OK;
 637	}
 638
 639	return dsa_enqueue_skb(nskb, dev);
 640}
 641
 642/* ethtool operations *******************************************************/
 643
 644static void dsa_slave_get_drvinfo(struct net_device *dev,
 645				  struct ethtool_drvinfo *drvinfo)
 646{
 647	strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 648	strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 649	strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 650}
 651
 652static int dsa_slave_get_regs_len(struct net_device *dev)
 653{
 654	struct dsa_port *dp = dsa_slave_to_port(dev);
 655	struct dsa_switch *ds = dp->ds;
 656
 657	if (ds->ops->get_regs_len)
 658		return ds->ops->get_regs_len(ds, dp->index);
 659
 660	return -EOPNOTSUPP;
 661}
 662
 663static void
 664dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 665{
 666	struct dsa_port *dp = dsa_slave_to_port(dev);
 667	struct dsa_switch *ds = dp->ds;
 668
 669	if (ds->ops->get_regs)
 670		ds->ops->get_regs(ds, dp->index, regs, _p);
 671}
 672
 673static int dsa_slave_nway_reset(struct net_device *dev)
 674{
 675	struct dsa_port *dp = dsa_slave_to_port(dev);
 676
 677	return phylink_ethtool_nway_reset(dp->pl);
 678}
 679
 680static int dsa_slave_get_eeprom_len(struct net_device *dev)
 681{
 682	struct dsa_port *dp = dsa_slave_to_port(dev);
 683	struct dsa_switch *ds = dp->ds;
 684
 685	if (ds->cd && ds->cd->eeprom_len)
 686		return ds->cd->eeprom_len;
 687
 688	if (ds->ops->get_eeprom_len)
 689		return ds->ops->get_eeprom_len(ds);
 690
 691	return 0;
 692}
 693
 694static int dsa_slave_get_eeprom(struct net_device *dev,
 695				struct ethtool_eeprom *eeprom, u8 *data)
 696{
 697	struct dsa_port *dp = dsa_slave_to_port(dev);
 698	struct dsa_switch *ds = dp->ds;
 699
 700	if (ds->ops->get_eeprom)
 701		return ds->ops->get_eeprom(ds, eeprom, data);
 702
 703	return -EOPNOTSUPP;
 704}
 705
 706static int dsa_slave_set_eeprom(struct net_device *dev,
 707				struct ethtool_eeprom *eeprom, u8 *data)
 708{
 709	struct dsa_port *dp = dsa_slave_to_port(dev);
 710	struct dsa_switch *ds = dp->ds;
 711
 712	if (ds->ops->set_eeprom)
 713		return ds->ops->set_eeprom(ds, eeprom, data);
 714
 715	return -EOPNOTSUPP;
 716}
 717
 718static void dsa_slave_get_strings(struct net_device *dev,
 719				  uint32_t stringset, uint8_t *data)
 720{
 721	struct dsa_port *dp = dsa_slave_to_port(dev);
 722	struct dsa_switch *ds = dp->ds;
 723
 724	if (stringset == ETH_SS_STATS) {
 725		int len = ETH_GSTRING_LEN;
 726
 727		strncpy(data, "tx_packets", len);
 728		strncpy(data + len, "tx_bytes", len);
 729		strncpy(data + 2 * len, "rx_packets", len);
 730		strncpy(data + 3 * len, "rx_bytes", len);
 731		if (ds->ops->get_strings)
 732			ds->ops->get_strings(ds, dp->index, stringset,
 733					     data + 4 * len);
 734	} else if (stringset ==  ETH_SS_TEST) {
 735		net_selftest_get_strings(data);
 736	}
 737
 738}
 739
 740static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 741					struct ethtool_stats *stats,
 742					uint64_t *data)
 743{
 744	struct dsa_port *dp = dsa_slave_to_port(dev);
 745	struct dsa_switch *ds = dp->ds;
 746	struct pcpu_sw_netstats *s;
 747	unsigned int start;
 748	int i;
 749
 750	for_each_possible_cpu(i) {
 751		u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 752
 753		s = per_cpu_ptr(dev->tstats, i);
 754		do {
 755			start = u64_stats_fetch_begin_irq(&s->syncp);
 756			tx_packets = s->tx_packets;
 757			tx_bytes = s->tx_bytes;
 758			rx_packets = s->rx_packets;
 759			rx_bytes = s->rx_bytes;
 760		} while (u64_stats_fetch_retry_irq(&s->syncp, start));
 761		data[0] += tx_packets;
 762		data[1] += tx_bytes;
 763		data[2] += rx_packets;
 764		data[3] += rx_bytes;
 765	}
 766	if (ds->ops->get_ethtool_stats)
 767		ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 768}
 769
 770static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 771{
 772	struct dsa_port *dp = dsa_slave_to_port(dev);
 773	struct dsa_switch *ds = dp->ds;
 774
 775	if (sset == ETH_SS_STATS) {
 776		int count = 0;
 777
 778		if (ds->ops->get_sset_count) {
 779			count = ds->ops->get_sset_count(ds, dp->index, sset);
 780			if (count < 0)
 781				return count;
 782		}
 783
 784		return count + 4;
 785	} else if (sset ==  ETH_SS_TEST) {
 786		return net_selftest_get_count();
 787	}
 788
 789	return -EOPNOTSUPP;
 790}
 791
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 792static void dsa_slave_net_selftest(struct net_device *ndev,
 793				   struct ethtool_test *etest, u64 *buf)
 794{
 795	struct dsa_port *dp = dsa_slave_to_port(ndev);
 796	struct dsa_switch *ds = dp->ds;
 797
 798	if (ds->ops->self_test) {
 799		ds->ops->self_test(ds, dp->index, etest, buf);
 800		return;
 801	}
 802
 803	net_selftest(ndev, etest, buf);
 804}
 805
 806static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 807{
 808	struct dsa_port *dp = dsa_slave_to_port(dev);
 809	struct dsa_switch *ds = dp->ds;
 810
 811	phylink_ethtool_get_wol(dp->pl, w);
 812
 813	if (ds->ops->get_wol)
 814		ds->ops->get_wol(ds, dp->index, w);
 815}
 816
 817static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 818{
 819	struct dsa_port *dp = dsa_slave_to_port(dev);
 820	struct dsa_switch *ds = dp->ds;
 821	int ret = -EOPNOTSUPP;
 822
 823	phylink_ethtool_set_wol(dp->pl, w);
 824
 825	if (ds->ops->set_wol)
 826		ret = ds->ops->set_wol(ds, dp->index, w);
 827
 828	return ret;
 829}
 830
 831static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 832{
 833	struct dsa_port *dp = dsa_slave_to_port(dev);
 834	struct dsa_switch *ds = dp->ds;
 835	int ret;
 836
 837	/* Port's PHY and MAC both need to be EEE capable */
 838	if (!dev->phydev || !dp->pl)
 839		return -ENODEV;
 840
 841	if (!ds->ops->set_mac_eee)
 842		return -EOPNOTSUPP;
 843
 844	ret = ds->ops->set_mac_eee(ds, dp->index, e);
 845	if (ret)
 846		return ret;
 847
 848	return phylink_ethtool_set_eee(dp->pl, e);
 849}
 850
 851static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 852{
 853	struct dsa_port *dp = dsa_slave_to_port(dev);
 854	struct dsa_switch *ds = dp->ds;
 855	int ret;
 856
 857	/* Port's PHY and MAC both need to be EEE capable */
 858	if (!dev->phydev || !dp->pl)
 859		return -ENODEV;
 860
 861	if (!ds->ops->get_mac_eee)
 862		return -EOPNOTSUPP;
 863
 864	ret = ds->ops->get_mac_eee(ds, dp->index, e);
 865	if (ret)
 866		return ret;
 867
 868	return phylink_ethtool_get_eee(dp->pl, e);
 869}
 870
 871static int dsa_slave_get_link_ksettings(struct net_device *dev,
 872					struct ethtool_link_ksettings *cmd)
 873{
 874	struct dsa_port *dp = dsa_slave_to_port(dev);
 875
 876	return phylink_ethtool_ksettings_get(dp->pl, cmd);
 877}
 878
 879static int dsa_slave_set_link_ksettings(struct net_device *dev,
 880					const struct ethtool_link_ksettings *cmd)
 881{
 882	struct dsa_port *dp = dsa_slave_to_port(dev);
 883
 884	return phylink_ethtool_ksettings_set(dp->pl, cmd);
 885}
 886
 
 
 
 
 
 
 
 
 
 
 887static void dsa_slave_get_pauseparam(struct net_device *dev,
 888				     struct ethtool_pauseparam *pause)
 889{
 890	struct dsa_port *dp = dsa_slave_to_port(dev);
 891
 892	phylink_ethtool_get_pauseparam(dp->pl, pause);
 893}
 894
 895static int dsa_slave_set_pauseparam(struct net_device *dev,
 896				    struct ethtool_pauseparam *pause)
 897{
 898	struct dsa_port *dp = dsa_slave_to_port(dev);
 899
 900	return phylink_ethtool_set_pauseparam(dp->pl, pause);
 901}
 902
 903#ifdef CONFIG_NET_POLL_CONTROLLER
 904static int dsa_slave_netpoll_setup(struct net_device *dev,
 905				   struct netpoll_info *ni)
 906{
 907	struct net_device *master = dsa_slave_to_master(dev);
 908	struct dsa_slave_priv *p = netdev_priv(dev);
 909	struct netpoll *netpoll;
 910	int err = 0;
 911
 912	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 913	if (!netpoll)
 914		return -ENOMEM;
 915
 916	err = __netpoll_setup(netpoll, master);
 917	if (err) {
 918		kfree(netpoll);
 919		goto out;
 920	}
 921
 922	p->netpoll = netpoll;
 923out:
 924	return err;
 925}
 926
 927static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 928{
 929	struct dsa_slave_priv *p = netdev_priv(dev);
 930	struct netpoll *netpoll = p->netpoll;
 931
 932	if (!netpoll)
 933		return;
 934
 935	p->netpoll = NULL;
 936
 937	__netpoll_free(netpoll);
 938}
 939
 940static void dsa_slave_poll_controller(struct net_device *dev)
 941{
 942}
 943#endif
 944
 945static int dsa_slave_get_phys_port_name(struct net_device *dev,
 946					char *name, size_t len)
 947{
 948	struct dsa_port *dp = dsa_slave_to_port(dev);
 949
 950	/* For non-legacy ports, devlink is used and it takes
 951	 * care of the name generation. This ndo implementation
 952	 * should be removed with legacy support.
 953	 */
 954	if (dp->ds->devlink)
 955		return -EOPNOTSUPP;
 956
 957	if (snprintf(name, len, "p%d", dp->index) >= len)
 958		return -EINVAL;
 959
 960	return 0;
 961}
 962
 963static struct dsa_mall_tc_entry *
 964dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 965{
 966	struct dsa_slave_priv *p = netdev_priv(dev);
 967	struct dsa_mall_tc_entry *mall_tc_entry;
 968
 969	list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 970		if (mall_tc_entry->cookie == cookie)
 971			return mall_tc_entry;
 972
 973	return NULL;
 974}
 975
 976static int
 977dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 978				  struct tc_cls_matchall_offload *cls,
 979				  bool ingress)
 980{
 
 981	struct dsa_port *dp = dsa_slave_to_port(dev);
 982	struct dsa_slave_priv *p = netdev_priv(dev);
 983	struct dsa_mall_mirror_tc_entry *mirror;
 984	struct dsa_mall_tc_entry *mall_tc_entry;
 985	struct dsa_switch *ds = dp->ds;
 986	struct flow_action_entry *act;
 987	struct dsa_port *to_dp;
 988	int err;
 989
 990	if (!ds->ops->port_mirror_add)
 991		return -EOPNOTSUPP;
 992
 993	if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 994					      cls->common.extack))
 995		return -EOPNOTSUPP;
 996
 997	act = &cls->rule->action.entries[0];
 998
 999	if (!act->dev)
1000		return -EINVAL;
1001
1002	if (!dsa_slave_dev_check(act->dev))
1003		return -EOPNOTSUPP;
1004
1005	mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1006	if (!mall_tc_entry)
1007		return -ENOMEM;
1008
1009	mall_tc_entry->cookie = cls->cookie;
1010	mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1011	mirror = &mall_tc_entry->mirror;
1012
1013	to_dp = dsa_slave_to_port(act->dev);
1014
1015	mirror->to_local_port = to_dp->index;
1016	mirror->ingress = ingress;
1017
1018	err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
1019	if (err) {
1020		kfree(mall_tc_entry);
1021		return err;
1022	}
1023
1024	list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1025
1026	return err;
1027}
1028
1029static int
1030dsa_slave_add_cls_matchall_police(struct net_device *dev,
1031				  struct tc_cls_matchall_offload *cls,
1032				  bool ingress)
1033{
1034	struct netlink_ext_ack *extack = cls->common.extack;
1035	struct dsa_port *dp = dsa_slave_to_port(dev);
1036	struct dsa_slave_priv *p = netdev_priv(dev);
1037	struct dsa_mall_policer_tc_entry *policer;
1038	struct dsa_mall_tc_entry *mall_tc_entry;
1039	struct dsa_switch *ds = dp->ds;
1040	struct flow_action_entry *act;
1041	int err;
1042
1043	if (!ds->ops->port_policer_add) {
1044		NL_SET_ERR_MSG_MOD(extack,
1045				   "Policing offload not implemented");
1046		return -EOPNOTSUPP;
1047	}
1048
1049	if (!ingress) {
1050		NL_SET_ERR_MSG_MOD(extack,
1051				   "Only supported on ingress qdisc");
1052		return -EOPNOTSUPP;
1053	}
1054
1055	if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1056					      cls->common.extack))
1057		return -EOPNOTSUPP;
1058
1059	list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1060		if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1061			NL_SET_ERR_MSG_MOD(extack,
1062					   "Only one port policer allowed");
1063			return -EEXIST;
1064		}
1065	}
1066
1067	act = &cls->rule->action.entries[0];
1068
1069	mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1070	if (!mall_tc_entry)
1071		return -ENOMEM;
1072
1073	mall_tc_entry->cookie = cls->cookie;
1074	mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1075	policer = &mall_tc_entry->policer;
1076	policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1077	policer->burst = act->police.burst;
1078
1079	err = ds->ops->port_policer_add(ds, dp->index, policer);
1080	if (err) {
1081		kfree(mall_tc_entry);
1082		return err;
1083	}
1084
1085	list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1086
1087	return err;
1088}
1089
1090static int dsa_slave_add_cls_matchall(struct net_device *dev,
1091				      struct tc_cls_matchall_offload *cls,
1092				      bool ingress)
1093{
1094	int err = -EOPNOTSUPP;
1095
1096	if (cls->common.protocol == htons(ETH_P_ALL) &&
1097	    flow_offload_has_one_action(&cls->rule->action) &&
1098	    cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1099		err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1100	else if (flow_offload_has_one_action(&cls->rule->action) &&
1101		 cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1102		err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1103
1104	return err;
1105}
1106
1107static void dsa_slave_del_cls_matchall(struct net_device *dev,
1108				       struct tc_cls_matchall_offload *cls)
1109{
1110	struct dsa_port *dp = dsa_slave_to_port(dev);
1111	struct dsa_mall_tc_entry *mall_tc_entry;
1112	struct dsa_switch *ds = dp->ds;
1113
1114	mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1115	if (!mall_tc_entry)
1116		return;
1117
1118	list_del(&mall_tc_entry->list);
1119
1120	switch (mall_tc_entry->type) {
1121	case DSA_PORT_MALL_MIRROR:
1122		if (ds->ops->port_mirror_del)
1123			ds->ops->port_mirror_del(ds, dp->index,
1124						 &mall_tc_entry->mirror);
1125		break;
1126	case DSA_PORT_MALL_POLICER:
1127		if (ds->ops->port_policer_del)
1128			ds->ops->port_policer_del(ds, dp->index);
1129		break;
1130	default:
1131		WARN_ON(1);
1132	}
1133
1134	kfree(mall_tc_entry);
1135}
1136
1137static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1138					   struct tc_cls_matchall_offload *cls,
1139					   bool ingress)
1140{
1141	if (cls->common.chain_index)
1142		return -EOPNOTSUPP;
1143
1144	switch (cls->command) {
1145	case TC_CLSMATCHALL_REPLACE:
1146		return dsa_slave_add_cls_matchall(dev, cls, ingress);
1147	case TC_CLSMATCHALL_DESTROY:
1148		dsa_slave_del_cls_matchall(dev, cls);
1149		return 0;
1150	default:
1151		return -EOPNOTSUPP;
1152	}
1153}
1154
1155static int dsa_slave_add_cls_flower(struct net_device *dev,
1156				    struct flow_cls_offload *cls,
1157				    bool ingress)
1158{
1159	struct dsa_port *dp = dsa_slave_to_port(dev);
1160	struct dsa_switch *ds = dp->ds;
1161	int port = dp->index;
1162
1163	if (!ds->ops->cls_flower_add)
1164		return -EOPNOTSUPP;
1165
1166	return ds->ops->cls_flower_add(ds, port, cls, ingress);
1167}
1168
1169static int dsa_slave_del_cls_flower(struct net_device *dev,
1170				    struct flow_cls_offload *cls,
1171				    bool ingress)
1172{
1173	struct dsa_port *dp = dsa_slave_to_port(dev);
1174	struct dsa_switch *ds = dp->ds;
1175	int port = dp->index;
1176
1177	if (!ds->ops->cls_flower_del)
1178		return -EOPNOTSUPP;
1179
1180	return ds->ops->cls_flower_del(ds, port, cls, ingress);
1181}
1182
1183static int dsa_slave_stats_cls_flower(struct net_device *dev,
1184				      struct flow_cls_offload *cls,
1185				      bool ingress)
1186{
1187	struct dsa_port *dp = dsa_slave_to_port(dev);
1188	struct dsa_switch *ds = dp->ds;
1189	int port = dp->index;
1190
1191	if (!ds->ops->cls_flower_stats)
1192		return -EOPNOTSUPP;
1193
1194	return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1195}
1196
1197static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1198					 struct flow_cls_offload *cls,
1199					 bool ingress)
1200{
1201	switch (cls->command) {
1202	case FLOW_CLS_REPLACE:
1203		return dsa_slave_add_cls_flower(dev, cls, ingress);
1204	case FLOW_CLS_DESTROY:
1205		return dsa_slave_del_cls_flower(dev, cls, ingress);
1206	case FLOW_CLS_STATS:
1207		return dsa_slave_stats_cls_flower(dev, cls, ingress);
1208	default:
1209		return -EOPNOTSUPP;
1210	}
1211}
1212
1213static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1214				       void *cb_priv, bool ingress)
1215{
1216	struct net_device *dev = cb_priv;
1217
1218	if (!tc_can_offload(dev))
1219		return -EOPNOTSUPP;
1220
1221	switch (type) {
1222	case TC_SETUP_CLSMATCHALL:
1223		return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1224	case TC_SETUP_CLSFLOWER:
1225		return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1226	default:
1227		return -EOPNOTSUPP;
1228	}
1229}
1230
1231static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1232					  void *type_data, void *cb_priv)
1233{
1234	return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1235}
1236
1237static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1238					  void *type_data, void *cb_priv)
1239{
1240	return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1241}
1242
1243static LIST_HEAD(dsa_slave_block_cb_list);
1244
1245static int dsa_slave_setup_tc_block(struct net_device *dev,
1246				    struct flow_block_offload *f)
1247{
1248	struct flow_block_cb *block_cb;
1249	flow_setup_cb_t *cb;
1250
1251	if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1252		cb = dsa_slave_setup_tc_block_cb_ig;
1253	else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1254		cb = dsa_slave_setup_tc_block_cb_eg;
1255	else
1256		return -EOPNOTSUPP;
1257
1258	f->driver_block_list = &dsa_slave_block_cb_list;
1259
1260	switch (f->command) {
1261	case FLOW_BLOCK_BIND:
1262		if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1263			return -EBUSY;
1264
1265		block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1266		if (IS_ERR(block_cb))
1267			return PTR_ERR(block_cb);
1268
1269		flow_block_cb_add(block_cb, f);
1270		list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1271		return 0;
1272	case FLOW_BLOCK_UNBIND:
1273		block_cb = flow_block_cb_lookup(f->block, cb, dev);
1274		if (!block_cb)
1275			return -ENOENT;
1276
1277		flow_block_cb_remove(block_cb, f);
1278		list_del(&block_cb->driver_list);
1279		return 0;
1280	default:
1281		return -EOPNOTSUPP;
1282	}
1283}
1284
1285static int dsa_slave_setup_ft_block(struct dsa_switch *ds, int port,
1286				    void *type_data)
1287{
1288	struct dsa_port *cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1289	struct net_device *master = cpu_dp->master;
1290
1291	if (!master->netdev_ops->ndo_setup_tc)
1292		return -EOPNOTSUPP;
1293
1294	return master->netdev_ops->ndo_setup_tc(master, TC_SETUP_FT, type_data);
1295}
1296
1297static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1298			      void *type_data)
1299{
1300	struct dsa_port *dp = dsa_slave_to_port(dev);
1301	struct dsa_switch *ds = dp->ds;
1302
1303	switch (type) {
1304	case TC_SETUP_BLOCK:
1305		return dsa_slave_setup_tc_block(dev, type_data);
1306	case TC_SETUP_FT:
1307		return dsa_slave_setup_ft_block(ds, dp->index, type_data);
1308	default:
1309		break;
1310	}
1311
1312	if (!ds->ops->port_setup_tc)
1313		return -EOPNOTSUPP;
1314
1315	return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1316}
1317
1318static int dsa_slave_get_rxnfc(struct net_device *dev,
1319			       struct ethtool_rxnfc *nfc, u32 *rule_locs)
1320{
1321	struct dsa_port *dp = dsa_slave_to_port(dev);
1322	struct dsa_switch *ds = dp->ds;
1323
1324	if (!ds->ops->get_rxnfc)
1325		return -EOPNOTSUPP;
1326
1327	return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1328}
1329
1330static int dsa_slave_set_rxnfc(struct net_device *dev,
1331			       struct ethtool_rxnfc *nfc)
1332{
1333	struct dsa_port *dp = dsa_slave_to_port(dev);
1334	struct dsa_switch *ds = dp->ds;
1335
1336	if (!ds->ops->set_rxnfc)
1337		return -EOPNOTSUPP;
1338
1339	return ds->ops->set_rxnfc(ds, dp->index, nfc);
1340}
1341
1342static int dsa_slave_get_ts_info(struct net_device *dev,
1343				 struct ethtool_ts_info *ts)
1344{
1345	struct dsa_slave_priv *p = netdev_priv(dev);
1346	struct dsa_switch *ds = p->dp->ds;
1347
1348	if (!ds->ops->get_ts_info)
1349		return -EOPNOTSUPP;
1350
1351	return ds->ops->get_ts_info(ds, p->dp->index, ts);
1352}
1353
1354static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1355				     u16 vid)
1356{
1357	struct net_device *master = dsa_slave_to_master(dev);
1358	struct dsa_port *dp = dsa_slave_to_port(dev);
1359	struct switchdev_obj_port_vlan vlan = {
1360		.obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1361		.vid = vid,
1362		/* This API only allows programming tagged, non-PVID VIDs */
1363		.flags = 0,
1364	};
1365	struct netlink_ext_ack extack = {0};
1366	int ret;
1367
1368	/* User port... */
1369	ret = dsa_port_vlan_add(dp, &vlan, &extack);
1370	if (ret) {
1371		if (extack._msg)
1372			netdev_err(dev, "%s\n", extack._msg);
1373		return ret;
1374	}
1375
1376	/* And CPU port... */
1377	ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &extack);
1378	if (ret) {
1379		if (extack._msg)
1380			netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1381				   extack._msg);
1382		return ret;
1383	}
1384
1385	return vlan_vid_add(master, proto, vid);
1386}
1387
1388static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1389				      u16 vid)
1390{
1391	struct net_device *master = dsa_slave_to_master(dev);
1392	struct dsa_port *dp = dsa_slave_to_port(dev);
1393	struct switchdev_obj_port_vlan vlan = {
1394		.vid = vid,
1395		/* This API only allows programming tagged, non-PVID VIDs */
1396		.flags = 0,
1397	};
1398	int err;
1399
1400	/* Do not deprogram the CPU port as it may be shared with other user
1401	 * ports which can be members of this VLAN as well.
1402	 */
1403	err = dsa_port_vlan_del(dp, &vlan);
1404	if (err)
1405		return err;
1406
1407	vlan_vid_del(master, proto, vid);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1408
1409	return 0;
1410}
1411
1412struct dsa_hw_port {
1413	struct list_head list;
1414	struct net_device *dev;
1415	int old_mtu;
1416};
1417
1418static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1419{
1420	const struct dsa_hw_port *p;
1421	int err;
1422
1423	list_for_each_entry(p, hw_port_list, list) {
1424		if (p->dev->mtu == mtu)
1425			continue;
1426
1427		err = dev_set_mtu(p->dev, mtu);
1428		if (err)
1429			goto rollback;
1430	}
1431
1432	return 0;
1433
1434rollback:
1435	list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1436		if (p->dev->mtu == p->old_mtu)
1437			continue;
1438
1439		if (dev_set_mtu(p->dev, p->old_mtu))
1440			netdev_err(p->dev, "Failed to restore MTU\n");
1441	}
1442
1443	return err;
1444}
1445
1446static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1447{
1448	struct dsa_hw_port *p, *n;
1449
1450	list_for_each_entry_safe(p, n, hw_port_list, list)
1451		kfree(p);
1452}
1453
1454/* Make the hardware datapath to/from @dev limited to a common MTU */
1455static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1456{
1457	struct list_head hw_port_list;
1458	struct dsa_switch_tree *dst;
1459	int min_mtu = ETH_MAX_MTU;
1460	struct dsa_port *other_dp;
1461	int err;
1462
1463	if (!dp->ds->mtu_enforcement_ingress)
1464		return;
1465
1466	if (!dp->bridge_dev)
1467		return;
1468
1469	INIT_LIST_HEAD(&hw_port_list);
1470
1471	/* Populate the list of ports that are part of the same bridge
1472	 * as the newly added/modified port
1473	 */
1474	list_for_each_entry(dst, &dsa_tree_list, list) {
1475		list_for_each_entry(other_dp, &dst->ports, list) {
1476			struct dsa_hw_port *hw_port;
1477			struct net_device *slave;
1478
1479			if (other_dp->type != DSA_PORT_TYPE_USER)
1480				continue;
1481
1482			if (other_dp->bridge_dev != dp->bridge_dev)
1483				continue;
1484
1485			if (!other_dp->ds->mtu_enforcement_ingress)
1486				continue;
1487
1488			slave = other_dp->slave;
1489
1490			if (min_mtu > slave->mtu)
1491				min_mtu = slave->mtu;
1492
1493			hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1494			if (!hw_port)
1495				goto out;
1496
1497			hw_port->dev = slave;
1498			hw_port->old_mtu = slave->mtu;
1499
1500			list_add(&hw_port->list, &hw_port_list);
1501		}
1502	}
1503
1504	/* Attempt to configure the entire hardware bridge to the newly added
1505	 * interface's MTU first, regardless of whether the intention of the
1506	 * user was to raise or lower it.
1507	 */
1508	err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1509	if (!err)
1510		goto out;
1511
1512	/* Clearly that didn't work out so well, so just set the minimum MTU on
1513	 * all hardware bridge ports now. If this fails too, then all ports will
1514	 * still have their old MTU rolled back anyway.
1515	 */
1516	dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1517
1518out:
1519	dsa_hw_port_list_free(&hw_port_list);
1520}
1521
1522int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1523{
1524	struct net_device *master = dsa_slave_to_master(dev);
1525	struct dsa_port *dp = dsa_slave_to_port(dev);
1526	struct dsa_slave_priv *p = netdev_priv(dev);
1527	struct dsa_switch *ds = p->dp->ds;
1528	struct dsa_port *dp_iter;
1529	struct dsa_port *cpu_dp;
1530	int port = p->dp->index;
1531	int largest_mtu = 0;
1532	int new_master_mtu;
1533	int old_master_mtu;
1534	int mtu_limit;
1535	int cpu_mtu;
1536	int err;
1537
1538	if (!ds->ops->port_change_mtu)
1539		return -EOPNOTSUPP;
1540
1541	list_for_each_entry(dp_iter, &ds->dst->ports, list) {
1542		int slave_mtu;
1543
1544		if (!dsa_port_is_user(dp_iter))
1545			continue;
1546
1547		/* During probe, this function will be called for each slave
1548		 * device, while not all of them have been allocated. That's
1549		 * ok, it doesn't change what the maximum is, so ignore it.
1550		 */
1551		if (!dp_iter->slave)
1552			continue;
1553
1554		/* Pretend that we already applied the setting, which we
1555		 * actually haven't (still haven't done all integrity checks)
1556		 */
1557		if (dp_iter == dp)
1558			slave_mtu = new_mtu;
1559		else
1560			slave_mtu = dp_iter->slave->mtu;
1561
1562		if (largest_mtu < slave_mtu)
1563			largest_mtu = slave_mtu;
1564	}
1565
1566	cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1567
1568	mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1569	old_master_mtu = master->mtu;
1570	new_master_mtu = largest_mtu + dsa_tag_protocol_overhead(cpu_dp->tag_ops);
1571	if (new_master_mtu > mtu_limit)
1572		return -ERANGE;
1573
1574	/* If the master MTU isn't over limit, there's no need to check the CPU
1575	 * MTU, since that surely isn't either.
1576	 */
1577	cpu_mtu = largest_mtu;
1578
1579	/* Start applying stuff */
1580	if (new_master_mtu != old_master_mtu) {
1581		err = dev_set_mtu(master, new_master_mtu);
1582		if (err < 0)
1583			goto out_master_failed;
1584
1585		/* We only need to propagate the MTU of the CPU port to
1586		 * upstream switches, so create a non-targeted notifier which
1587		 * updates all switches.
1588		 */
1589		err = dsa_port_mtu_change(cpu_dp, cpu_mtu, false);
1590		if (err)
1591			goto out_cpu_failed;
1592	}
1593
1594	err = dsa_port_mtu_change(dp, new_mtu, true);
1595	if (err)
1596		goto out_port_failed;
1597
1598	dev->mtu = new_mtu;
1599
1600	dsa_bridge_mtu_normalization(dp);
1601
1602	return 0;
1603
1604out_port_failed:
1605	if (new_master_mtu != old_master_mtu)
1606		dsa_port_mtu_change(cpu_dp, old_master_mtu -
1607				    dsa_tag_protocol_overhead(cpu_dp->tag_ops),
1608				    false);
1609out_cpu_failed:
1610	if (new_master_mtu != old_master_mtu)
1611		dev_set_mtu(master, old_master_mtu);
1612out_master_failed:
1613	return err;
1614}
1615
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1616static const struct ethtool_ops dsa_slave_ethtool_ops = {
1617	.get_drvinfo		= dsa_slave_get_drvinfo,
1618	.get_regs_len		= dsa_slave_get_regs_len,
1619	.get_regs		= dsa_slave_get_regs,
1620	.nway_reset		= dsa_slave_nway_reset,
1621	.get_link		= ethtool_op_get_link,
1622	.get_eeprom_len		= dsa_slave_get_eeprom_len,
1623	.get_eeprom		= dsa_slave_get_eeprom,
1624	.set_eeprom		= dsa_slave_set_eeprom,
1625	.get_strings		= dsa_slave_get_strings,
1626	.get_ethtool_stats	= dsa_slave_get_ethtool_stats,
1627	.get_sset_count		= dsa_slave_get_sset_count,
 
 
 
 
1628	.set_wol		= dsa_slave_set_wol,
1629	.get_wol		= dsa_slave_get_wol,
1630	.set_eee		= dsa_slave_set_eee,
1631	.get_eee		= dsa_slave_get_eee,
1632	.get_link_ksettings	= dsa_slave_get_link_ksettings,
1633	.set_link_ksettings	= dsa_slave_set_link_ksettings,
 
1634	.get_pauseparam		= dsa_slave_get_pauseparam,
1635	.set_pauseparam		= dsa_slave_set_pauseparam,
1636	.get_rxnfc		= dsa_slave_get_rxnfc,
1637	.set_rxnfc		= dsa_slave_set_rxnfc,
1638	.get_ts_info		= dsa_slave_get_ts_info,
1639	.self_test		= dsa_slave_net_selftest,
1640};
1641
1642static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1643{
1644	struct dsa_port *dp = dsa_slave_to_port(dev);
1645
1646	return dp->ds->devlink ? &dp->devlink_port : NULL;
1647}
1648
1649static void dsa_slave_get_stats64(struct net_device *dev,
1650				  struct rtnl_link_stats64 *s)
1651{
1652	struct dsa_port *dp = dsa_slave_to_port(dev);
1653	struct dsa_switch *ds = dp->ds;
1654
1655	if (ds->ops->get_stats64)
1656		ds->ops->get_stats64(ds, dp->index, s);
1657	else
1658		dev_get_tstats64(dev, s);
1659}
1660
1661static int dsa_slave_fill_forward_path(struct net_device_path_ctx *ctx,
1662				       struct net_device_path *path)
1663{
1664	struct dsa_port *dp = dsa_slave_to_port(ctx->dev);
 
1665	struct dsa_port *cpu_dp = dp->cpu_dp;
1666
1667	path->dev = ctx->dev;
1668	path->type = DEV_PATH_DSA;
1669	path->dsa.proto = cpu_dp->tag_ops->proto;
1670	path->dsa.port = dp->index;
1671	ctx->dev = cpu_dp->master;
1672
1673	return 0;
1674}
1675
1676static const struct net_device_ops dsa_slave_netdev_ops = {
1677	.ndo_open	 	= dsa_slave_open,
1678	.ndo_stop		= dsa_slave_close,
1679	.ndo_start_xmit		= dsa_slave_xmit,
1680	.ndo_change_rx_flags	= dsa_slave_change_rx_flags,
1681	.ndo_set_rx_mode	= dsa_slave_set_rx_mode,
1682	.ndo_set_mac_address	= dsa_slave_set_mac_address,
1683	.ndo_fdb_dump		= dsa_slave_fdb_dump,
1684	.ndo_do_ioctl		= dsa_slave_ioctl,
1685	.ndo_get_iflink		= dsa_slave_get_iflink,
1686#ifdef CONFIG_NET_POLL_CONTROLLER
1687	.ndo_netpoll_setup	= dsa_slave_netpoll_setup,
1688	.ndo_netpoll_cleanup	= dsa_slave_netpoll_cleanup,
1689	.ndo_poll_controller	= dsa_slave_poll_controller,
1690#endif
1691	.ndo_get_phys_port_name	= dsa_slave_get_phys_port_name,
1692	.ndo_setup_tc		= dsa_slave_setup_tc,
1693	.ndo_get_stats64	= dsa_slave_get_stats64,
1694	.ndo_get_port_parent_id	= dsa_slave_get_port_parent_id,
1695	.ndo_vlan_rx_add_vid	= dsa_slave_vlan_rx_add_vid,
1696	.ndo_vlan_rx_kill_vid	= dsa_slave_vlan_rx_kill_vid,
1697	.ndo_get_devlink_port	= dsa_slave_get_devlink_port,
1698	.ndo_change_mtu		= dsa_slave_change_mtu,
1699	.ndo_fill_forward_path	= dsa_slave_fill_forward_path,
1700};
1701
1702static struct device_type dsa_type = {
1703	.name	= "dsa",
1704};
1705
1706void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1707{
1708	const struct dsa_port *dp = dsa_to_port(ds, port);
1709
1710	if (dp->pl)
1711		phylink_mac_change(dp->pl, up);
1712}
1713EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1714
1715static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1716					  struct phylink_link_state *state)
1717{
1718	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1719	struct dsa_switch *ds = dp->ds;
1720
1721	/* No need to check that this operation is valid, the callback would
1722	 * not be called if it was not.
1723	 */
1724	ds->ops->phylink_fixed_state(ds, dp->index, state);
1725}
1726
1727/* slave device setup *******************************************************/
1728static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr,
1729				 u32 flags)
1730{
1731	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1732	struct dsa_switch *ds = dp->ds;
1733
1734	slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1735	if (!slave_dev->phydev) {
1736		netdev_err(slave_dev, "no phy at %d\n", addr);
1737		return -ENODEV;
1738	}
1739
1740	slave_dev->phydev->dev_flags |= flags;
1741
1742	return phylink_connect_phy(dp->pl, slave_dev->phydev);
1743}
1744
1745static int dsa_slave_phy_setup(struct net_device *slave_dev)
1746{
1747	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1748	struct device_node *port_dn = dp->dn;
1749	struct dsa_switch *ds = dp->ds;
1750	phy_interface_t mode;
1751	u32 phy_flags = 0;
1752	int ret;
1753
1754	ret = of_get_phy_mode(port_dn, &mode);
1755	if (ret)
1756		mode = PHY_INTERFACE_MODE_NA;
1757
1758	dp->pl_config.dev = &slave_dev->dev;
1759	dp->pl_config.type = PHYLINK_NETDEV;
1760
1761	/* The get_fixed_state callback takes precedence over polling the
1762	 * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1763	 * this if the switch provides such a callback.
1764	 */
1765	if (ds->ops->phylink_fixed_state) {
1766		dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1767		dp->pl_config.poll_fixed_state = true;
1768	}
1769
1770	dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1771				&dsa_port_phylink_mac_ops);
1772	if (IS_ERR(dp->pl)) {
1773		netdev_err(slave_dev,
1774			   "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1775		return PTR_ERR(dp->pl);
1776	}
1777
1778	if (ds->ops->get_phy_flags)
1779		phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1780
1781	ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1782	if (ret == -ENODEV && ds->slave_mii_bus) {
1783		/* We could not connect to a designated PHY or SFP, so try to
1784		 * use the switch internal MDIO bus instead
1785		 */
1786		ret = dsa_slave_phy_connect(slave_dev, dp->index, phy_flags);
1787	}
1788	if (ret) {
1789		netdev_err(slave_dev, "failed to connect to PHY: %pe\n",
1790			   ERR_PTR(ret));
1791		phylink_destroy(dp->pl);
1792	}
1793
1794	return ret;
1795}
1796
1797void dsa_slave_setup_tagger(struct net_device *slave)
1798{
1799	struct dsa_port *dp = dsa_slave_to_port(slave);
 
1800	struct dsa_slave_priv *p = netdev_priv(slave);
1801	const struct dsa_port *cpu_dp = dp->cpu_dp;
1802	struct net_device *master = cpu_dp->master;
1803	const struct dsa_switch *ds = dp->ds;
1804
1805	slave->needed_headroom = cpu_dp->tag_ops->needed_headroom;
1806	slave->needed_tailroom = cpu_dp->tag_ops->needed_tailroom;
1807	/* Try to save one extra realloc later in the TX path (in the master)
1808	 * by also inheriting the master's needed headroom and tailroom.
1809	 * The 8021q driver also does this.
1810	 */
1811	slave->needed_headroom += master->needed_headroom;
1812	slave->needed_tailroom += master->needed_tailroom;
1813
1814	p->xmit = cpu_dp->tag_ops->xmit;
1815
1816	slave->features = master->vlan_features | NETIF_F_HW_TC;
1817	if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1818		slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1819	slave->hw_features |= NETIF_F_HW_TC;
1820	slave->features |= NETIF_F_LLTX;
1821	if (slave->needed_tailroom)
1822		slave->features &= ~(NETIF_F_SG | NETIF_F_FRAGLIST);
1823}
1824
1825static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1826static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1827					    struct netdev_queue *txq,
1828					    void *_unused)
1829{
1830	lockdep_set_class(&txq->_xmit_lock,
1831			  &dsa_slave_netdev_xmit_lock_key);
1832}
1833
1834int dsa_slave_suspend(struct net_device *slave_dev)
1835{
1836	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1837
1838	if (!netif_running(slave_dev))
1839		return 0;
1840
1841	netif_device_detach(slave_dev);
1842
1843	rtnl_lock();
1844	phylink_stop(dp->pl);
1845	rtnl_unlock();
1846
1847	return 0;
1848}
1849
1850int dsa_slave_resume(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_attach(slave_dev);
1858
1859	rtnl_lock();
1860	phylink_start(dp->pl);
1861	rtnl_unlock();
1862
1863	return 0;
1864}
1865
1866int dsa_slave_create(struct dsa_port *port)
1867{
1868	const struct dsa_port *cpu_dp = port->cpu_dp;
1869	struct net_device *master = cpu_dp->master;
1870	struct dsa_switch *ds = port->ds;
1871	const char *name = port->name;
1872	struct net_device *slave_dev;
1873	struct dsa_slave_priv *p;
 
 
1874	int ret;
1875
1876	if (!ds->num_tx_queues)
1877		ds->num_tx_queues = 1;
1878
 
 
 
 
 
 
 
 
1879	slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1880				     NET_NAME_UNKNOWN, ether_setup,
1881				     ds->num_tx_queues, 1);
1882	if (slave_dev == NULL)
1883		return -ENOMEM;
1884
 
1885	slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
 
 
 
1886	if (!is_zero_ether_addr(port->mac))
1887		ether_addr_copy(slave_dev->dev_addr, port->mac);
1888	else
1889		eth_hw_addr_inherit(slave_dev, master);
1890	slave_dev->priv_flags |= IFF_NO_QUEUE;
 
 
1891	slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1892	if (ds->ops->port_max_mtu)
1893		slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1894	SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1895
1896	netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1897				 NULL);
1898
1899	SET_NETDEV_DEV(slave_dev, port->ds->dev);
 
1900	slave_dev->dev.of_node = port->dn;
1901	slave_dev->vlan_features = master->vlan_features;
1902
1903	p = netdev_priv(slave_dev);
1904	slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1905	if (!slave_dev->tstats) {
1906		free_netdev(slave_dev);
1907		return -ENOMEM;
1908	}
1909
1910	ret = gro_cells_init(&p->gcells, slave_dev);
1911	if (ret)
1912		goto out_free;
1913
1914	p->dp = port;
1915	INIT_LIST_HEAD(&p->mall_tc_list);
1916	port->slave = slave_dev;
1917	dsa_slave_setup_tagger(slave_dev);
1918
1919	rtnl_lock();
1920	ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1921	rtnl_unlock();
1922	if (ret && ret != -EOPNOTSUPP)
1923		dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1924			 ret, ETH_DATA_LEN, port->index);
1925
1926	netif_carrier_off(slave_dev);
1927
1928	ret = dsa_slave_phy_setup(slave_dev);
1929	if (ret) {
1930		netdev_err(slave_dev,
1931			   "error %d setting up PHY for tree %d, switch %d, port %d\n",
1932			   ret, ds->dst->index, ds->index, port->index);
1933		goto out_gcells;
1934	}
1935
1936	rtnl_lock();
1937
 
 
 
 
 
1938	ret = register_netdevice(slave_dev);
1939	if (ret) {
1940		netdev_err(master, "error %d registering interface %s\n",
1941			   ret, slave_dev->name);
1942		rtnl_unlock();
1943		goto out_phy;
1944	}
1945
 
 
 
 
 
 
 
 
 
 
 
1946	ret = netdev_upper_dev_link(master, slave_dev, NULL);
1947
1948	rtnl_unlock();
1949
1950	if (ret)
1951		goto out_unregister;
1952
1953	return 0;
1954
1955out_unregister:
1956	unregister_netdev(slave_dev);
1957out_phy:
1958	rtnl_lock();
1959	phylink_disconnect_phy(p->dp->pl);
1960	rtnl_unlock();
1961	phylink_destroy(p->dp->pl);
1962out_gcells:
1963	gro_cells_destroy(&p->gcells);
1964out_free:
1965	free_percpu(slave_dev->tstats);
1966	free_netdev(slave_dev);
1967	port->slave = NULL;
1968	return ret;
1969}
1970
1971void dsa_slave_destroy(struct net_device *slave_dev)
1972{
1973	struct net_device *master = dsa_slave_to_master(slave_dev);
1974	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1975	struct dsa_slave_priv *p = netdev_priv(slave_dev);
1976
1977	netif_carrier_off(slave_dev);
1978	rtnl_lock();
1979	netdev_upper_dev_unlink(master, slave_dev);
1980	unregister_netdevice(slave_dev);
1981	phylink_disconnect_phy(dp->pl);
1982	rtnl_unlock();
1983
1984	phylink_destroy(dp->pl);
1985	gro_cells_destroy(&p->gcells);
1986	free_percpu(slave_dev->tstats);
1987	free_netdev(slave_dev);
1988}
1989
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1990bool dsa_slave_dev_check(const struct net_device *dev)
1991{
1992	return dev->netdev_ops == &dsa_slave_netdev_ops;
1993}
1994EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
1995
1996static int dsa_slave_changeupper(struct net_device *dev,
1997				 struct netdev_notifier_changeupper_info *info)
1998{
1999	struct dsa_port *dp = dsa_slave_to_port(dev);
2000	struct netlink_ext_ack *extack;
2001	int err = NOTIFY_DONE;
2002
 
 
 
2003	extack = netdev_notifier_info_to_extack(&info->info);
2004
2005	if (netif_is_bridge_master(info->upper_dev)) {
2006		if (info->linking) {
2007			err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2008			if (!err)
2009				dsa_bridge_mtu_normalization(dp);
 
 
 
 
 
 
2010			err = notifier_from_errno(err);
2011		} else {
2012			dsa_port_bridge_leave(dp, info->upper_dev);
2013			err = NOTIFY_OK;
2014		}
2015	} else if (netif_is_lag_master(info->upper_dev)) {
2016		if (info->linking) {
2017			err = dsa_port_lag_join(dp, info->upper_dev,
2018						info->upper_info, extack);
2019			if (err == -EOPNOTSUPP) {
2020				NL_SET_ERR_MSG_MOD(info->info.extack,
2021						   "Offloading not supported");
2022				err = 0;
2023			}
2024			err = notifier_from_errno(err);
2025		} else {
2026			dsa_port_lag_leave(dp, info->upper_dev);
2027			err = NOTIFY_OK;
2028		}
2029	} else if (is_hsr_master(info->upper_dev)) {
2030		if (info->linking) {
2031			err = dsa_port_hsr_join(dp, info->upper_dev);
2032			if (err == -EOPNOTSUPP) {
2033				NL_SET_ERR_MSG_MOD(info->info.extack,
2034						   "Offloading not supported");
2035				err = 0;
2036			}
2037			err = notifier_from_errno(err);
2038		} else {
2039			dsa_port_hsr_leave(dp, info->upper_dev);
2040			err = NOTIFY_OK;
2041		}
2042	}
2043
2044	return err;
2045}
2046
2047static int dsa_slave_prechangeupper(struct net_device *dev,
2048				    struct netdev_notifier_changeupper_info *info)
2049{
2050	struct dsa_port *dp = dsa_slave_to_port(dev);
2051	struct netlink_ext_ack *extack;
2052	int err = 0;
2053
2054	extack = netdev_notifier_info_to_extack(&info->info);
 
2055
2056	if (netif_is_bridge_master(info->upper_dev) && !info->linking)
2057		err = dsa_port_pre_bridge_leave(dp, info->upper_dev, extack);
2058	else if (netif_is_lag_master(info->upper_dev) && !info->linking)
2059		err = dsa_port_pre_lag_leave(dp, info->upper_dev, extack);
2060	/* dsa_port_pre_hsr_leave is not yet necessary since hsr cannot be
2061	 * meaningfully enslaved to a bridge yet
2062	 */
2063
2064	return notifier_from_errno(err);
2065}
2066
2067static int
2068dsa_slave_lag_changeupper(struct net_device *dev,
2069			  struct netdev_notifier_changeupper_info *info)
2070{
2071	struct net_device *lower;
2072	struct list_head *iter;
2073	int err = NOTIFY_DONE;
2074	struct dsa_port *dp;
2075
 
 
 
2076	netdev_for_each_lower_dev(dev, lower, iter) {
2077		if (!dsa_slave_dev_check(lower))
2078			continue;
2079
2080		dp = dsa_slave_to_port(lower);
2081		if (!dp->lag_dev)
2082			/* Software LAG */
2083			continue;
2084
2085		err = dsa_slave_changeupper(lower, info);
2086		if (notifier_to_errno(err))
2087			break;
2088	}
2089
2090	return err;
2091}
2092
2093/* Same as dsa_slave_lag_changeupper() except that it calls
2094 * dsa_slave_prechangeupper()
2095 */
2096static int
2097dsa_slave_lag_prechangeupper(struct net_device *dev,
2098			     struct netdev_notifier_changeupper_info *info)
2099{
2100	struct net_device *lower;
2101	struct list_head *iter;
2102	int err = NOTIFY_DONE;
2103	struct dsa_port *dp;
2104
 
 
 
2105	netdev_for_each_lower_dev(dev, lower, iter) {
2106		if (!dsa_slave_dev_check(lower))
2107			continue;
2108
2109		dp = dsa_slave_to_port(lower);
2110		if (!dp->lag_dev)
2111			/* Software LAG */
2112			continue;
2113
2114		err = dsa_slave_prechangeupper(lower, info);
2115		if (notifier_to_errno(err))
2116			break;
2117	}
2118
2119	return err;
2120}
2121
2122static int
2123dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2124				 struct netdev_notifier_changeupper_info *info)
2125{
2126	struct netlink_ext_ack *ext_ack;
2127	struct net_device *slave;
2128	struct dsa_port *dp;
2129
2130	ext_ack = netdev_notifier_info_to_extack(&info->info);
2131
2132	if (!is_vlan_dev(dev))
2133		return NOTIFY_DONE;
2134
2135	slave = vlan_dev_real_dev(dev);
2136	if (!dsa_slave_dev_check(slave))
2137		return NOTIFY_DONE;
2138
2139	dp = dsa_slave_to_port(slave);
2140	if (!dp->bridge_dev)
 
2141		return NOTIFY_DONE;
2142
2143	/* Deny enslaving a VLAN device into a VLAN-aware bridge */
2144	if (br_vlan_enabled(dp->bridge_dev) &&
2145	    netif_is_bridge_master(info->upper_dev) && info->linking) {
2146		NL_SET_ERR_MSG_MOD(ext_ack,
2147				   "Cannot enslave VLAN device into VLAN aware bridge");
2148		return notifier_from_errno(-EINVAL);
2149	}
2150
2151	return NOTIFY_DONE;
2152}
2153
2154static int
2155dsa_slave_check_8021q_upper(struct net_device *dev,
2156			    struct netdev_notifier_changeupper_info *info)
2157{
2158	struct dsa_port *dp = dsa_slave_to_port(dev);
2159	struct net_device *br = dp->bridge_dev;
2160	struct bridge_vlan_info br_info;
2161	struct netlink_ext_ack *extack;
2162	int err = NOTIFY_DONE;
2163	u16 vid;
2164
2165	if (!br || !br_vlan_enabled(br))
2166		return NOTIFY_DONE;
2167
2168	extack = netdev_notifier_info_to_extack(&info->info);
2169	vid = vlan_dev_vlan_id(info->upper_dev);
2170
2171	/* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2172	 * device, respectively the VID is not found, returning
2173	 * 0 means success, which is a failure for us here.
2174	 */
2175	err = br_vlan_get_info(br, vid, &br_info);
2176	if (err == 0) {
2177		NL_SET_ERR_MSG_MOD(extack,
2178				   "This VLAN is already configured by the bridge");
2179		return notifier_from_errno(-EBUSY);
2180	}
2181
2182	return NOTIFY_DONE;
2183}
2184
2185static int
2186dsa_slave_prechangeupper_sanity_check(struct net_device *dev,
2187				      struct netdev_notifier_changeupper_info *info)
2188{
2189	struct dsa_switch *ds;
2190	struct dsa_port *dp;
2191	int err;
2192
2193	if (!dsa_slave_dev_check(dev))
2194		return dsa_prevent_bridging_8021q_upper(dev, info);
2195
2196	dp = dsa_slave_to_port(dev);
2197	ds = dp->ds;
2198
2199	if (ds->ops->port_prechangeupper) {
2200		err = ds->ops->port_prechangeupper(ds, dp->index, info);
2201		if (err)
2202			return notifier_from_errno(err);
2203	}
2204
2205	if (is_vlan_dev(info->upper_dev))
2206		return dsa_slave_check_8021q_upper(dev, info);
2207
2208	return NOTIFY_DONE;
2209}
2210
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2211static int dsa_slave_netdevice_event(struct notifier_block *nb,
2212				     unsigned long event, void *ptr)
2213{
2214	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2215
2216	switch (event) {
2217	case NETDEV_PRECHANGEUPPER: {
2218		struct netdev_notifier_changeupper_info *info = ptr;
2219		int err;
2220
2221		err = dsa_slave_prechangeupper_sanity_check(dev, info);
2222		if (err != NOTIFY_DONE)
 
 
 
 
 
 
 
 
 
 
 
 
2223			return err;
2224
2225		if (dsa_slave_dev_check(dev))
2226			return dsa_slave_prechangeupper(dev, ptr);
 
2227
2228		if (netif_is_lag_master(dev))
2229			return dsa_slave_lag_prechangeupper(dev, ptr);
 
2230
2231		break;
2232	}
2233	case NETDEV_CHANGEUPPER:
2234		if (dsa_slave_dev_check(dev))
2235			return dsa_slave_changeupper(dev, ptr);
 
 
 
 
 
 
 
2236
2237		if (netif_is_lag_master(dev))
2238			return dsa_slave_lag_changeupper(dev, ptr);
 
2239
2240		break;
 
2241	case NETDEV_CHANGELOWERSTATE: {
2242		struct netdev_notifier_changelowerstate_info *info = ptr;
2243		struct dsa_port *dp;
2244		int err;
2245
2246		if (!dsa_slave_dev_check(dev))
2247			break;
 
 
 
 
 
 
 
 
 
2248
2249		dp = dsa_slave_to_port(dev);
 
2250
2251		err = dsa_port_lag_change(dp, info->lower_state_info);
2252		return notifier_from_errno(err);
2253	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2254	case NETDEV_GOING_DOWN: {
2255		struct dsa_port *dp, *cpu_dp;
2256		struct dsa_switch_tree *dst;
2257		LIST_HEAD(close_list);
2258
2259		if (!netdev_uses_dsa(dev))
2260			return NOTIFY_DONE;
2261
2262		cpu_dp = dev->dsa_ptr;
2263		dst = cpu_dp->ds->dst;
2264
 
 
2265		list_for_each_entry(dp, &dst->ports, list) {
2266			if (!dsa_is_user_port(dp->ds, dp->index))
 
 
 
2267				continue;
2268
2269			list_add(&dp->slave->close_list, &close_list);
2270		}
2271
2272		dev_close_many(&close_list, true);
2273
2274		return NOTIFY_OK;
2275	}
2276	default:
2277		break;
2278	}
2279
2280	return NOTIFY_DONE;
2281}
2282
2283static void
2284dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2285{
2286	struct switchdev_notifier_fdb_info info = {};
2287	struct dsa_switch *ds = switchdev_work->ds;
2288	struct dsa_port *dp;
2289
2290	if (!dsa_is_user_port(ds, switchdev_work->port))
2291		return;
2292
2293	info.addr = switchdev_work->addr;
2294	info.vid = switchdev_work->vid;
2295	info.offloaded = true;
2296	dp = dsa_to_port(ds, switchdev_work->port);
2297	call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2298				 dp->slave, &info.info, NULL);
2299}
2300
2301static void dsa_slave_switchdev_event_work(struct work_struct *work)
2302{
2303	struct dsa_switchdev_event_work *switchdev_work =
2304		container_of(work, struct dsa_switchdev_event_work, work);
2305	struct dsa_switch *ds = switchdev_work->ds;
 
 
 
2306	struct dsa_port *dp;
2307	int err;
2308
2309	dp = dsa_to_port(ds, switchdev_work->port);
 
2310
2311	rtnl_lock();
2312	switch (switchdev_work->event) {
2313	case SWITCHDEV_FDB_ADD_TO_DEVICE:
2314		if (switchdev_work->host_addr)
2315			err = dsa_port_host_fdb_add(dp, switchdev_work->addr,
2316						    switchdev_work->vid);
 
2317		else
2318			err = dsa_port_fdb_add(dp, switchdev_work->addr,
2319					       switchdev_work->vid);
2320		if (err) {
2321			dev_err(ds->dev,
2322				"port %d failed to add %pM vid %d to fdb: %d\n",
2323				dp->index, switchdev_work->addr,
2324				switchdev_work->vid, err);
2325			break;
2326		}
2327		dsa_fdb_offload_notify(switchdev_work);
2328		break;
2329
2330	case SWITCHDEV_FDB_DEL_TO_DEVICE:
2331		if (switchdev_work->host_addr)
2332			err = dsa_port_host_fdb_del(dp, switchdev_work->addr,
2333						    switchdev_work->vid);
 
2334		else
2335			err = dsa_port_fdb_del(dp, switchdev_work->addr,
2336					       switchdev_work->vid);
2337		if (err) {
2338			dev_err(ds->dev,
2339				"port %d failed to delete %pM vid %d from fdb: %d\n",
2340				dp->index, switchdev_work->addr,
2341				switchdev_work->vid, err);
2342		}
2343
2344		break;
2345	}
2346	rtnl_unlock();
2347
2348	dev_put(switchdev_work->dev);
2349	kfree(switchdev_work);
2350}
2351
2352static int dsa_lower_dev_walk(struct net_device *lower_dev,
2353			      struct netdev_nested_priv *priv)
2354{
2355	if (dsa_slave_dev_check(lower_dev)) {
2356		priv->data = (void *)netdev_priv(lower_dev);
2357		return 1;
2358	}
2359
2360	return 0;
 
 
 
 
 
 
 
2361}
2362
2363static struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev)
 
 
 
2364{
2365	struct netdev_nested_priv priv = {
2366		.data = NULL,
2367	};
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2368
2369	netdev_walk_all_lower_dev_rcu(dev, dsa_lower_dev_walk, &priv);
2370
2371	return (struct dsa_slave_priv *)priv.data;
2372}
2373
2374/* Called under rcu_read_lock() */
2375static int dsa_slave_switchdev_event(struct notifier_block *unused,
2376				     unsigned long event, void *ptr)
2377{
2378	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2379	const struct switchdev_notifier_fdb_info *fdb_info;
2380	struct dsa_switchdev_event_work *switchdev_work;
2381	bool host_addr = false;
2382	struct dsa_port *dp;
2383	int err;
2384
2385	switch (event) {
2386	case SWITCHDEV_PORT_ATTR_SET:
2387		err = switchdev_handle_port_attr_set(dev, ptr,
2388						     dsa_slave_dev_check,
2389						     dsa_slave_port_attr_set);
2390		return notifier_from_errno(err);
2391	case SWITCHDEV_FDB_ADD_TO_DEVICE:
2392	case SWITCHDEV_FDB_DEL_TO_DEVICE:
2393		fdb_info = ptr;
2394
2395		if (dsa_slave_dev_check(dev)) {
2396			dp = dsa_slave_to_port(dev);
2397
2398			if (fdb_info->is_local)
2399				host_addr = true;
2400			else if (!fdb_info->added_by_user)
2401				return NOTIFY_OK;
2402		} else {
2403			/* Snoop addresses added to foreign interfaces
2404			 * bridged with us, or the bridge
2405			 * itself. Dynamically learned addresses can
2406			 * also be added for switches that don't
2407			 * automatically learn SA from CPU-injected
2408			 * traffic.
2409			 */
2410			struct net_device *br_dev;
2411			struct dsa_slave_priv *p;
2412
2413			if (netif_is_bridge_master(dev))
2414				br_dev = dev;
2415			else
2416				br_dev = netdev_master_upper_dev_get_rcu(dev);
2417
2418			if (!br_dev)
2419				return NOTIFY_DONE;
2420
2421			if (!netif_is_bridge_master(br_dev))
2422				return NOTIFY_DONE;
2423
2424			p = dsa_slave_dev_lower_find(br_dev);
2425			if (!p)
2426				return NOTIFY_DONE;
2427
2428			dp = p->dp;
2429			host_addr = fdb_info->is_local;
2430
2431			/* FDB entries learned by the software bridge should
2432			 * be installed as host addresses only if the driver
2433			 * requests assisted learning.
2434			 * On the other hand, FDB entries for local termination
2435			 * should always be installed.
2436			 */
2437			if (!fdb_info->added_by_user && !fdb_info->is_local &&
2438			    !dp->ds->assisted_learning_on_cpu_port)
2439				return NOTIFY_DONE;
2440
2441			/* When the bridge learns an address on an offloaded
2442			 * LAG we don't want to send traffic to the CPU, the
2443			 * other ports bridged with the LAG should be able to
2444			 * autonomously forward towards it.
2445			 * On the other hand, if the address is local
2446			 * (therefore not learned) then we want to trap it to
2447			 * the CPU regardless of whether the interface it
2448			 * belongs to is offloaded or not.
2449			 */
2450			if (dsa_tree_offloads_bridge_port(dp->ds->dst, dev) &&
2451			    !fdb_info->is_local)
2452				return NOTIFY_DONE;
2453		}
2454
2455		if (!dp->ds->ops->port_fdb_add || !dp->ds->ops->port_fdb_del)
2456			return NOTIFY_DONE;
2457
2458		switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2459		if (!switchdev_work)
2460			return NOTIFY_BAD;
2461
2462		INIT_WORK(&switchdev_work->work,
2463			  dsa_slave_switchdev_event_work);
2464		switchdev_work->ds = dp->ds;
2465		switchdev_work->port = dp->index;
2466		switchdev_work->event = event;
2467		switchdev_work->dev = dev;
2468
2469		ether_addr_copy(switchdev_work->addr,
2470				fdb_info->addr);
2471		switchdev_work->vid = fdb_info->vid;
2472		switchdev_work->host_addr = host_addr;
2473
2474		/* Hold a reference for dsa_fdb_offload_notify */
2475		dev_hold(dev);
2476		dsa_schedule_work(&switchdev_work->work);
2477		break;
2478	default:
2479		return NOTIFY_DONE;
2480	}
2481
2482	return NOTIFY_OK;
2483}
2484
2485static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2486					      unsigned long event, void *ptr)
2487{
2488	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2489	int err;
2490
2491	switch (event) {
2492	case SWITCHDEV_PORT_OBJ_ADD:
2493		err = switchdev_handle_port_obj_add(dev, ptr,
2494						    dsa_slave_dev_check,
2495						    dsa_slave_port_obj_add);
 
2496		return notifier_from_errno(err);
2497	case SWITCHDEV_PORT_OBJ_DEL:
2498		err = switchdev_handle_port_obj_del(dev, ptr,
2499						    dsa_slave_dev_check,
2500						    dsa_slave_port_obj_del);
 
2501		return notifier_from_errno(err);
2502	case SWITCHDEV_PORT_ATTR_SET:
2503		err = switchdev_handle_port_attr_set(dev, ptr,
2504						     dsa_slave_dev_check,
2505						     dsa_slave_port_attr_set);
2506		return notifier_from_errno(err);
2507	}
2508
2509	return NOTIFY_DONE;
2510}
2511
2512static struct notifier_block dsa_slave_nb __read_mostly = {
2513	.notifier_call  = dsa_slave_netdevice_event,
2514};
2515
2516struct notifier_block dsa_slave_switchdev_notifier = {
2517	.notifier_call = dsa_slave_switchdev_event,
2518};
2519
2520struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2521	.notifier_call = dsa_slave_switchdev_blocking_event,
2522};
2523
2524int dsa_slave_register_notifier(void)
2525{
2526	struct notifier_block *nb;
2527	int err;
2528
2529	err = register_netdevice_notifier(&dsa_slave_nb);
2530	if (err)
2531		return err;
2532
2533	err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2534	if (err)
2535		goto err_switchdev_nb;
2536
2537	nb = &dsa_slave_switchdev_blocking_notifier;
2538	err = register_switchdev_blocking_notifier(nb);
2539	if (err)
2540		goto err_switchdev_blocking_nb;
2541
2542	return 0;
2543
2544err_switchdev_blocking_nb:
2545	unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2546err_switchdev_nb:
2547	unregister_netdevice_notifier(&dsa_slave_nb);
2548	return err;
2549}
2550
2551void dsa_slave_unregister_notifier(void)
2552{
2553	struct notifier_block *nb;
2554	int err;
2555
2556	nb = &dsa_slave_switchdev_blocking_notifier;
2557	err = unregister_switchdev_blocking_notifier(nb);
2558	if (err)
2559		pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2560
2561	err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2562	if (err)
2563		pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2564
2565	err = unregister_netdevice_notifier(&dsa_slave_nb);
2566	if (err)
2567		pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2568}