1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * net/dsa/slave.c - Slave device handling
   4 * Copyright (c) 2008-2009 Marvell Semiconductor
 
 
 
 
 
   5 */
   6
   7#include <linux/list.h>
   8#include <linux/etherdevice.h>
   9#include <linux/netdevice.h>
  10#include <linux/phy.h>
  11#include <linux/phy_fixed.h>
  12#include <linux/phylink.h>
  13#include <linux/of_net.h>
  14#include <linux/of_mdio.h>
  15#include <linux/mdio.h>
  16#include <net/rtnetlink.h>
  17#include <net/pkt_cls.h>
  18#include <net/tc_act/tc_mirred.h>
  19#include <linux/if_bridge.h>
  20#include <linux/netpoll.h>
  21#include <linux/ptp_classify.h>
  22
  23#include "dsa_priv.h"
  24
  25/* slave mii_bus handling ***************************************************/
  26static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  27{
  28	struct dsa_switch *ds = bus->priv;
  29
  30	if (ds->phys_mii_mask & (1 << addr))
  31		return ds->ops->phy_read(ds, addr, reg);
  32
  33	return 0xffff;
  34}
  35
  36static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  37{
  38	struct dsa_switch *ds = bus->priv;
  39
  40	if (ds->phys_mii_mask & (1 << addr))
  41		return ds->ops->phy_write(ds, addr, reg, val);
  42
  43	return 0;
  44}
  45
  46void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  47{
  48	ds->slave_mii_bus->priv = (void *)ds;
  49	ds->slave_mii_bus->name = "dsa slave smi";
  50	ds->slave_mii_bus->read = dsa_slave_phy_read;
  51	ds->slave_mii_bus->write = dsa_slave_phy_write;
  52	snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  53		 ds->dst->index, ds->index);
  54	ds->slave_mii_bus->parent = ds->dev;
  55	ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  56}
  57
  58
  59/* slave device handling ****************************************************/
  60static int dsa_slave_get_iflink(const struct net_device *dev)
  61{
  62	return dsa_slave_to_master(dev)->ifindex;
 
 
 
 
 
 
 
  63}
  64
  65static int dsa_slave_open(struct net_device *dev)
  66{
  67	struct net_device *master = dsa_slave_to_master(dev);
  68	struct dsa_port *dp = dsa_slave_to_port(dev);
 
 
 
  69	int err;
  70
  71	if (!(master->flags & IFF_UP))
  72		return -ENETDOWN;
  73
  74	if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  75		err = dev_uc_add(master, dev->dev_addr);
  76		if (err < 0)
  77			goto out;
  78	}
  79
  80	if (dev->flags & IFF_ALLMULTI) {
  81		err = dev_set_allmulti(master, 1);
  82		if (err < 0)
  83			goto del_unicast;
  84	}
  85	if (dev->flags & IFF_PROMISC) {
  86		err = dev_set_promiscuity(master, 1);
  87		if (err < 0)
  88			goto clear_allmulti;
  89	}
  90
  91	err = dsa_port_enable_rt(dp, dev->phydev);
  92	if (err)
  93		goto clear_promisc;
 
 
 
 
 
 
 
 
  94
  95	return 0;
  96
  97clear_promisc:
  98	if (dev->flags & IFF_PROMISC)
  99		dev_set_promiscuity(master, -1);
 100clear_allmulti:
 101	if (dev->flags & IFF_ALLMULTI)
 102		dev_set_allmulti(master, -1);
 103del_unicast:
 104	if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 105		dev_uc_del(master, dev->dev_addr);
 106out:
 107	return err;
 108}
 109
 110static int dsa_slave_close(struct net_device *dev)
 111{
 112	struct net_device *master = dsa_slave_to_master(dev);
 113	struct dsa_port *dp = dsa_slave_to_port(dev);
 
 114
 115	dsa_port_disable_rt(dp);
 
 116
 117	dev_mc_unsync(master, dev);
 118	dev_uc_unsync(master, dev);
 119	if (dev->flags & IFF_ALLMULTI)
 120		dev_set_allmulti(master, -1);
 121	if (dev->flags & IFF_PROMISC)
 122		dev_set_promiscuity(master, -1);
 123
 124	if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 125		dev_uc_del(master, dev->dev_addr);
 126
 
 
 
 
 
 
 127	return 0;
 128}
 129
 130static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 131{
 132	struct net_device *master = dsa_slave_to_master(dev);
 133	if (dev->flags & IFF_UP) {
 134		if (change & IFF_ALLMULTI)
 135			dev_set_allmulti(master,
 136					 dev->flags & IFF_ALLMULTI ? 1 : -1);
 137		if (change & IFF_PROMISC)
 138			dev_set_promiscuity(master,
 139					    dev->flags & IFF_PROMISC ? 1 : -1);
 140	}
 141}
 142
 143static void dsa_slave_set_rx_mode(struct net_device *dev)
 144{
 145	struct net_device *master = dsa_slave_to_master(dev);
 
 146
 147	dev_mc_sync(master, dev);
 148	dev_uc_sync(master, dev);
 149}
 150
 151static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 152{
 153	struct net_device *master = dsa_slave_to_master(dev);
 
 154	struct sockaddr *addr = a;
 155	int err;
 156
 157	if (!is_valid_ether_addr(addr->sa_data))
 158		return -EADDRNOTAVAIL;
 159
 160	if (!(dev->flags & IFF_UP))
 161		goto out;
 162
 163	if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 164		err = dev_uc_add(master, addr->sa_data);
 165		if (err < 0)
 166			return err;
 167	}
 168
 169	if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 170		dev_uc_del(master, dev->dev_addr);
 171
 172out:
 173	ether_addr_copy(dev->dev_addr, addr->sa_data);
 174
 175	return 0;
 176}
 177
 178struct dsa_slave_dump_ctx {
 179	struct net_device *dev;
 180	struct sk_buff *skb;
 181	struct netlink_callback *cb;
 182	int idx;
 183};
 184
 185static int
 186dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
 187			   bool is_static, void *data)
 188{
 189	struct dsa_slave_dump_ctx *dump = data;
 190	u32 portid = NETLINK_CB(dump->cb->skb).portid;
 191	u32 seq = dump->cb->nlh->nlmsg_seq;
 192	struct nlmsghdr *nlh;
 193	struct ndmsg *ndm;
 194
 195	if (dump->idx < dump->cb->args[2])
 196		goto skip;
 197
 198	nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 199			sizeof(*ndm), NLM_F_MULTI);
 200	if (!nlh)
 201		return -EMSGSIZE;
 202
 203	ndm = nlmsg_data(nlh);
 204	ndm->ndm_family  = AF_BRIDGE;
 205	ndm->ndm_pad1    = 0;
 206	ndm->ndm_pad2    = 0;
 207	ndm->ndm_flags   = NTF_SELF;
 208	ndm->ndm_type    = 0;
 209	ndm->ndm_ifindex = dump->dev->ifindex;
 210	ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
 211
 212	if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
 213		goto nla_put_failure;
 214
 215	if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
 216		goto nla_put_failure;
 
 217
 218	nlmsg_end(dump->skb, nlh);
 
 
 
 
 
 
 
 219
 220skip:
 221	dump->idx++;
 222	return 0;
 
 
 
 
 
 
 
 
 
 
 223
 224nla_put_failure:
 225	nlmsg_cancel(dump->skb, nlh);
 226	return -EMSGSIZE;
 227}
 228
 229static int
 230dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 231		   struct net_device *dev, struct net_device *filter_dev,
 232		   int *idx)
 233{
 234	struct dsa_port *dp = dsa_slave_to_port(dev);
 235	struct dsa_slave_dump_ctx dump = {
 236		.dev = dev,
 237		.skb = skb,
 238		.cb = cb,
 239		.idx = *idx,
 240	};
 241	int err;
 242
 243	err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
 244	*idx = dump.idx;
 245
 246	return err;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 247}
 248
 249static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 250{
 251	struct dsa_slave_priv *p = netdev_priv(dev);
 252	struct dsa_switch *ds = p->dp->ds;
 253	int port = p->dp->index;
 254
 255	/* Pass through to switch driver if it supports timestamping */
 256	switch (cmd) {
 257	case SIOCGHWTSTAMP:
 258		if (ds->ops->port_hwtstamp_get)
 259			return ds->ops->port_hwtstamp_get(ds, port, ifr);
 260		break;
 261	case SIOCSHWTSTAMP:
 262		if (ds->ops->port_hwtstamp_set)
 263			return ds->ops->port_hwtstamp_set(ds, port, ifr);
 264		break;
 265	}
 266
 267	return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 268}
 269
 270static int dsa_slave_port_attr_set(struct net_device *dev,
 271				   const struct switchdev_attr *attr,
 272				   struct switchdev_trans *trans)
 273{
 274	struct dsa_port *dp = dsa_slave_to_port(dev);
 
 275	int ret;
 276
 277	switch (attr->id) {
 278	case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 279		ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
 
 
 
 
 280		break;
 281	case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 282		ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
 283					      trans);
 284		break;
 285	case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 286		ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
 287		break;
 288	case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
 289		ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
 290						trans);
 291		break;
 292	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 293		ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans);
 294		break;
 295	case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
 296		ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, trans);
 297		break;
 298	default:
 299		ret = -EOPNOTSUPP;
 300		break;
 301	}
 302
 303	return ret;
 304}
 305
 306static int dsa_slave_vlan_add(struct net_device *dev,
 307			      const struct switchdev_obj *obj,
 308			      struct switchdev_trans *trans)
 309{
 310	struct dsa_port *dp = dsa_slave_to_port(dev);
 311	struct switchdev_obj_port_vlan vlan;
 312	int err;
 313
 314	if (obj->orig_dev != dev)
 315		return -EOPNOTSUPP;
 316
 317	if (dsa_port_skip_vlan_configuration(dp))
 318		return 0;
 319
 320	vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 321
 322	err = dsa_port_vlan_add(dp, &vlan, trans);
 323	if (err)
 324		return err;
 325
 326	/* We need the dedicated CPU port to be a member of the VLAN as well.
 327	 * Even though drivers often handle CPU membership in special ways,
 328	 * it doesn't make sense to program a PVID, so clear this flag.
 329	 */
 330	vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
 331
 332	err = dsa_port_vlan_add(dp->cpu_dp, &vlan, trans);
 333	if (err)
 334		return err;
 335
 336	return 0;
 337}
 338
 339static int dsa_slave_port_obj_add(struct net_device *dev,
 340				  const struct switchdev_obj *obj,
 341				  struct switchdev_trans *trans,
 342				  struct netlink_ext_ack *extack)
 343{
 344	struct dsa_port *dp = dsa_slave_to_port(dev);
 345	int err;
 346
 347	/* For the prepare phase, ensure the full set of changes is feasable in
 348	 * one go in order to signal a failure properly. If an operation is not
 349	 * supported, return -EOPNOTSUPP.
 350	 */
 351
 352	switch (obj->id) {
 353	case SWITCHDEV_OBJ_ID_PORT_MDB:
 354		if (obj->orig_dev != dev)
 355			return -EOPNOTSUPP;
 356		err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 357		break;
 358	case SWITCHDEV_OBJ_ID_HOST_MDB:
 359		/* DSA can directly translate this to a normal MDB add,
 360		 * but on the CPU port.
 361		 */
 362		err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj),
 363				       trans);
 364		break;
 365	case SWITCHDEV_OBJ_ID_PORT_VLAN:
 366		err = dsa_slave_vlan_add(dev, obj, trans);
 
 
 367		break;
 368	default:
 369		err = -EOPNOTSUPP;
 370		break;
 371	}
 372
 373	return err;
 374}
 375
 376static int dsa_slave_vlan_del(struct net_device *dev,
 377			      const struct switchdev_obj *obj)
 378{
 379	struct dsa_port *dp = dsa_slave_to_port(dev);
 380
 381	if (obj->orig_dev != dev)
 382		return -EOPNOTSUPP;
 383
 384	if (dsa_port_skip_vlan_configuration(dp))
 385		return 0;
 
 
 
 
 
 
 
 
 
 
 
 386
 387	/* Do not deprogram the CPU port as it may be shared with other user
 388	 * ports which can be members of this VLAN as well.
 389	 */
 390	return dsa_port_vlan_del(dp, SWITCHDEV_OBJ_PORT_VLAN(obj));
 391}
 392
 393static int dsa_slave_port_obj_del(struct net_device *dev,
 394				  const struct switchdev_obj *obj)
 
 395{
 396	struct dsa_port *dp = dsa_slave_to_port(dev);
 397	int err;
 398
 399	switch (obj->id) {
 400	case SWITCHDEV_OBJ_ID_PORT_MDB:
 401		if (obj->orig_dev != dev)
 402			return -EOPNOTSUPP;
 403		err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 404		break;
 405	case SWITCHDEV_OBJ_ID_HOST_MDB:
 406		/* DSA can directly translate this to a normal MDB add,
 407		 * but on the CPU port.
 408		 */
 409		err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 410		break;
 411	case SWITCHDEV_OBJ_ID_PORT_VLAN:
 412		err = dsa_slave_vlan_del(dev, obj);
 
 
 413		break;
 414	default:
 415		err = -EOPNOTSUPP;
 416		break;
 417	}
 418
 419	return err;
 420}
 421
 422static int dsa_slave_get_port_parent_id(struct net_device *dev,
 423					struct netdev_phys_item_id *ppid)
 424{
 425	struct dsa_port *dp = dsa_slave_to_port(dev);
 426	struct dsa_switch *ds = dp->ds;
 427	struct dsa_switch_tree *dst = ds->dst;
 428
 429	/* For non-legacy ports, devlink is used and it takes
 430	 * care of the name generation. This ndo implementation
 431	 * should be removed with legacy support.
 432	 */
 433	if (dp->ds->devlink)
 434		return -EOPNOTSUPP;
 435
 436	ppid->id_len = sizeof(dst->index);
 437	memcpy(&ppid->id, &dst->index, ppid->id_len);
 438
 439	return 0;
 
 
 
 440}
 441
 442static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 443						     struct sk_buff *skb)
 444{
 445#ifdef CONFIG_NET_POLL_CONTROLLER
 446	struct dsa_slave_priv *p = netdev_priv(dev);
 
 447
 448	return netpoll_send_skb(p->netpoll, skb);
 449#else
 450	BUG();
 451	return NETDEV_TX_OK;
 452#endif
 453}
 454
 455static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 456				 struct sk_buff *skb)
 457{
 458	struct dsa_switch *ds = p->dp->ds;
 459	struct sk_buff *clone;
 460	unsigned int type;
 461
 462	type = ptp_classify_raw(skb);
 463	if (type == PTP_CLASS_NONE)
 464		return;
 465
 466	if (!ds->ops->port_txtstamp)
 467		return;
 
 
 
 468
 469	clone = skb_clone_sk(skb);
 470	if (!clone)
 471		return;
 
 
 472
 473	DSA_SKB_CB(skb)->clone = clone;
 
 
 
 
 
 
 
 474
 475	if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type))
 476		return;
 477
 478	kfree_skb(clone);
 
 
 
 
 
 
 
 
 
 479}
 480
 481netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
 482{
 
 
 
 
 
 
 
 
 
 
 
 483	/* SKB for netpoll still need to be mangled with the protocol-specific
 484	 * tag to be successfully transmitted
 485	 */
 486	if (unlikely(netpoll_tx_running(dev)))
 487		return dsa_slave_netpoll_send_skb(dev, skb);
 488
 489	/* Queue the SKB for transmission on the parent interface, but
 490	 * do not modify its EtherType
 491	 */
 492	skb->dev = dsa_slave_to_master(dev);
 493	dev_queue_xmit(skb);
 494
 495	return NETDEV_TX_OK;
 496}
 497EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
 498
 499static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 
 500{
 501	struct dsa_slave_priv *p = netdev_priv(dev);
 502	struct pcpu_sw_netstats *s;
 503	struct sk_buff *nskb;
 504
 505	s = this_cpu_ptr(p->stats64);
 506	u64_stats_update_begin(&s->syncp);
 507	s->tx_packets++;
 508	s->tx_bytes += skb->len;
 509	u64_stats_update_end(&s->syncp);
 510
 511	DSA_SKB_CB(skb)->clone = NULL;
 512
 513	/* Identify PTP protocol packets, clone them, and pass them to the
 514	 * switch driver
 515	 */
 516	dsa_skb_tx_timestamp(p, skb);
 
 
 517
 518	/* Transmit function may have to reallocate the original SKB,
 519	 * in which case it must have freed it. Only free it here on error.
 520	 */
 521	nskb = p->xmit(skb, dev);
 522	if (!nskb) {
 523		kfree_skb(skb);
 524		return NETDEV_TX_OK;
 525	}
 526
 527	return dsa_enqueue_skb(nskb, dev);
 528}
 529
 530/* ethtool operations *******************************************************/
 
 
 
 
 
 
 
 
 
 531
 532static void dsa_slave_get_drvinfo(struct net_device *dev,
 533				  struct ethtool_drvinfo *drvinfo)
 534{
 535	strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 
 536	strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 537	strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 538}
 539
 540static int dsa_slave_get_regs_len(struct net_device *dev)
 541{
 542	struct dsa_port *dp = dsa_slave_to_port(dev);
 543	struct dsa_switch *ds = dp->ds;
 544
 545	if (ds->ops->get_regs_len)
 546		return ds->ops->get_regs_len(ds, dp->index);
 547
 548	return -EOPNOTSUPP;
 549}
 550
 551static void
 552dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 553{
 554	struct dsa_port *dp = dsa_slave_to_port(dev);
 555	struct dsa_switch *ds = dp->ds;
 556
 557	if (ds->ops->get_regs)
 558		ds->ops->get_regs(ds, dp->index, regs, _p);
 559}
 560
 561static int dsa_slave_nway_reset(struct net_device *dev)
 562{
 563	struct dsa_port *dp = dsa_slave_to_port(dev);
 
 
 
 
 
 
 
 
 
 
 564
 565	return phylink_ethtool_nway_reset(dp->pl);
 
 
 
 
 
 566}
 567
 568static int dsa_slave_get_eeprom_len(struct net_device *dev)
 569{
 570	struct dsa_port *dp = dsa_slave_to_port(dev);
 571	struct dsa_switch *ds = dp->ds;
 572
 573	if (ds->cd && ds->cd->eeprom_len)
 574		return ds->cd->eeprom_len;
 575
 576	if (ds->ops->get_eeprom_len)
 577		return ds->ops->get_eeprom_len(ds);
 578
 579	return 0;
 580}
 581
 582static int dsa_slave_get_eeprom(struct net_device *dev,
 583				struct ethtool_eeprom *eeprom, u8 *data)
 584{
 585	struct dsa_port *dp = dsa_slave_to_port(dev);
 586	struct dsa_switch *ds = dp->ds;
 587
 588	if (ds->ops->get_eeprom)
 589		return ds->ops->get_eeprom(ds, eeprom, data);
 590
 591	return -EOPNOTSUPP;
 592}
 593
 594static int dsa_slave_set_eeprom(struct net_device *dev,
 595				struct ethtool_eeprom *eeprom, u8 *data)
 596{
 597	struct dsa_port *dp = dsa_slave_to_port(dev);
 598	struct dsa_switch *ds = dp->ds;
 599
 600	if (ds->ops->set_eeprom)
 601		return ds->ops->set_eeprom(ds, eeprom, data);
 602
 603	return -EOPNOTSUPP;
 604}
 605
 606static void dsa_slave_get_strings(struct net_device *dev,
 607				  uint32_t stringset, uint8_t *data)
 608{
 609	struct dsa_port *dp = dsa_slave_to_port(dev);
 610	struct dsa_switch *ds = dp->ds;
 611
 612	if (stringset == ETH_SS_STATS) {
 613		int len = ETH_GSTRING_LEN;
 614
 615		strncpy(data, "tx_packets", len);
 616		strncpy(data + len, "tx_bytes", len);
 617		strncpy(data + 2 * len, "rx_packets", len);
 618		strncpy(data + 3 * len, "rx_bytes", len);
 619		if (ds->ops->get_strings)
 620			ds->ops->get_strings(ds, dp->index, stringset,
 621					     data + 4 * len);
 622	}
 623}
 624
 625static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 626					struct ethtool_stats *stats,
 627					uint64_t *data)
 628{
 629	struct dsa_port *dp = dsa_slave_to_port(dev);
 630	struct dsa_slave_priv *p = netdev_priv(dev);
 631	struct dsa_switch *ds = dp->ds;
 632	struct pcpu_sw_netstats *s;
 633	unsigned int start;
 634	int i;
 635
 636	for_each_possible_cpu(i) {
 637		u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
 638
 639		s = per_cpu_ptr(p->stats64, i);
 640		do {
 641			start = u64_stats_fetch_begin_irq(&s->syncp);
 642			tx_packets = s->tx_packets;
 643			tx_bytes = s->tx_bytes;
 644			rx_packets = s->rx_packets;
 645			rx_bytes = s->rx_bytes;
 646		} while (u64_stats_fetch_retry_irq(&s->syncp, start));
 647		data[0] += tx_packets;
 648		data[1] += tx_bytes;
 649		data[2] += rx_packets;
 650		data[3] += rx_bytes;
 651	}
 652	if (ds->ops->get_ethtool_stats)
 653		ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
 654}
 655
 656static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 657{
 658	struct dsa_port *dp = dsa_slave_to_port(dev);
 659	struct dsa_switch *ds = dp->ds;
 660
 661	if (sset == ETH_SS_STATS) {
 662		int count;
 663
 664		count = 4;
 665		if (ds->ops->get_sset_count)
 666			count += ds->ops->get_sset_count(ds, dp->index, sset);
 667
 668		return count;
 669	}
 670
 671	return -EOPNOTSUPP;
 672}
 673
 674static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 675{
 676	struct dsa_port *dp = dsa_slave_to_port(dev);
 677	struct dsa_switch *ds = dp->ds;
 678
 679	phylink_ethtool_get_wol(dp->pl, w);
 680
 681	if (ds->ops->get_wol)
 682		ds->ops->get_wol(ds, dp->index, w);
 683}
 684
 685static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 686{
 687	struct dsa_port *dp = dsa_slave_to_port(dev);
 688	struct dsa_switch *ds = dp->ds;
 689	int ret = -EOPNOTSUPP;
 690
 691	phylink_ethtool_set_wol(dp->pl, w);
 692
 693	if (ds->ops->set_wol)
 694		ret = ds->ops->set_wol(ds, dp->index, w);
 695
 696	return ret;
 697}
 698
 699static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 700{
 701	struct dsa_port *dp = dsa_slave_to_port(dev);
 702	struct dsa_switch *ds = dp->ds;
 703	int ret;
 704
 705	/* Port's PHY and MAC both need to be EEE capable */
 706	if (!dev->phydev || !dp->pl)
 707		return -ENODEV;
 708
 709	if (!ds->ops->set_mac_eee)
 710		return -EOPNOTSUPP;
 711
 712	ret = ds->ops->set_mac_eee(ds, dp->index, e);
 713	if (ret)
 714		return ret;
 715
 716	return phylink_ethtool_set_eee(dp->pl, e);
 
 
 
 717}
 718
 719static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 720{
 721	struct dsa_port *dp = dsa_slave_to_port(dev);
 722	struct dsa_switch *ds = dp->ds;
 723	int ret;
 724
 725	/* Port's PHY and MAC both need to be EEE capable */
 726	if (!dev->phydev || !dp->pl)
 727		return -ENODEV;
 728
 729	if (!ds->ops->get_mac_eee)
 730		return -EOPNOTSUPP;
 731
 732	ret = ds->ops->get_mac_eee(ds, dp->index, e);
 733	if (ret)
 734		return ret;
 735
 736	return phylink_ethtool_get_eee(dp->pl, e);
 737}
 738
 739static int dsa_slave_get_link_ksettings(struct net_device *dev,
 740					struct ethtool_link_ksettings *cmd)
 741{
 742	struct dsa_port *dp = dsa_slave_to_port(dev);
 743
 744	return phylink_ethtool_ksettings_get(dp->pl, cmd);
 745}
 746
 747static int dsa_slave_set_link_ksettings(struct net_device *dev,
 748					const struct ethtool_link_ksettings *cmd)
 749{
 750	struct dsa_port *dp = dsa_slave_to_port(dev);
 751
 752	return phylink_ethtool_ksettings_set(dp->pl, cmd);
 753}
 754
 755static void dsa_slave_get_pauseparam(struct net_device *dev,
 756				     struct ethtool_pauseparam *pause)
 757{
 758	struct dsa_port *dp = dsa_slave_to_port(dev);
 759
 760	phylink_ethtool_get_pauseparam(dp->pl, pause);
 761}
 762
 763static int dsa_slave_set_pauseparam(struct net_device *dev,
 764				    struct ethtool_pauseparam *pause)
 765{
 766	struct dsa_port *dp = dsa_slave_to_port(dev);
 767
 768	return phylink_ethtool_set_pauseparam(dp->pl, pause);
 769}
 770
 771#ifdef CONFIG_NET_POLL_CONTROLLER
 772static int dsa_slave_netpoll_setup(struct net_device *dev,
 773				   struct netpoll_info *ni)
 774{
 775	struct net_device *master = dsa_slave_to_master(dev);
 776	struct dsa_slave_priv *p = netdev_priv(dev);
 
 
 777	struct netpoll *netpoll;
 778	int err = 0;
 779
 780	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 781	if (!netpoll)
 782		return -ENOMEM;
 783
 784	err = __netpoll_setup(netpoll, master);
 785	if (err) {
 786		kfree(netpoll);
 787		goto out;
 788	}
 789
 790	p->netpoll = netpoll;
 791out:
 792	return err;
 793}
 794
 795static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 796{
 797	struct dsa_slave_priv *p = netdev_priv(dev);
 798	struct netpoll *netpoll = p->netpoll;
 799
 800	if (!netpoll)
 801		return;
 802
 803	p->netpoll = NULL;
 804
 805	__netpoll_free(netpoll);
 806}
 807
 808static void dsa_slave_poll_controller(struct net_device *dev)
 809{
 810}
 811#endif
 812
 813static int dsa_slave_get_phys_port_name(struct net_device *dev,
 814					char *name, size_t len)
 815{
 816	struct dsa_port *dp = dsa_slave_to_port(dev);
 817
 818	/* For non-legacy ports, devlink is used and it takes
 819	 * care of the name generation. This ndo implementation
 820	 * should be removed with legacy support.
 821	 */
 822	if (dp->ds->devlink)
 823		return -EOPNOTSUPP;
 824
 825	if (snprintf(name, len, "p%d", dp->index) >= len)
 826		return -EINVAL;
 827
 828	return 0;
 829}
 830
 831static struct dsa_mall_tc_entry *
 832dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 833{
 834	struct dsa_slave_priv *p = netdev_priv(dev);
 835	struct dsa_mall_tc_entry *mall_tc_entry;
 836
 837	list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
 838		if (mall_tc_entry->cookie == cookie)
 839			return mall_tc_entry;
 840
 841	return NULL;
 842}
 843
 844static int
 845dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 846				  struct tc_cls_matchall_offload *cls,
 847				  bool ingress)
 848{
 849	struct dsa_port *dp = dsa_slave_to_port(dev);
 850	struct dsa_slave_priv *p = netdev_priv(dev);
 851	struct dsa_mall_mirror_tc_entry *mirror;
 852	struct dsa_mall_tc_entry *mall_tc_entry;
 853	struct dsa_switch *ds = dp->ds;
 854	struct flow_action_entry *act;
 855	struct dsa_port *to_dp;
 856	int err;
 857
 858	if (!ds->ops->port_mirror_add)
 859		return -EOPNOTSUPP;
 860
 861	if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 862					      cls->common.extack))
 863		return -EOPNOTSUPP;
 864
 865	act = &cls->rule->action.entries[0];
 866
 867	if (!act->dev)
 868		return -EINVAL;
 869
 870	if (!dsa_slave_dev_check(act->dev))
 871		return -EOPNOTSUPP;
 872
 873	mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 874	if (!mall_tc_entry)
 875		return -ENOMEM;
 876
 877	mall_tc_entry->cookie = cls->cookie;
 878	mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 879	mirror = &mall_tc_entry->mirror;
 880
 881	to_dp = dsa_slave_to_port(act->dev);
 882
 883	mirror->to_local_port = to_dp->index;
 884	mirror->ingress = ingress;
 885
 886	err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
 887	if (err) {
 888		kfree(mall_tc_entry);
 889		return err;
 890	}
 891
 892	list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 893
 894	return err;
 895}
 896
 897static int
 898dsa_slave_add_cls_matchall_police(struct net_device *dev,
 899				  struct tc_cls_matchall_offload *cls,
 900				  bool ingress)
 901{
 902	struct netlink_ext_ack *extack = cls->common.extack;
 903	struct dsa_port *dp = dsa_slave_to_port(dev);
 904	struct dsa_slave_priv *p = netdev_priv(dev);
 905	struct dsa_mall_policer_tc_entry *policer;
 906	struct dsa_mall_tc_entry *mall_tc_entry;
 907	struct dsa_switch *ds = dp->ds;
 908	struct flow_action_entry *act;
 909	int err;
 910
 911	if (!ds->ops->port_policer_add) {
 912		NL_SET_ERR_MSG_MOD(extack,
 913				   "Policing offload not implemented");
 914		return -EOPNOTSUPP;
 915	}
 916
 917	if (!ingress) {
 918		NL_SET_ERR_MSG_MOD(extack,
 919				   "Only supported on ingress qdisc");
 920		return -EOPNOTSUPP;
 921	}
 922
 923	if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 924					      cls->common.extack))
 925		return -EOPNOTSUPP;
 926
 927	list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
 928		if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
 929			NL_SET_ERR_MSG_MOD(extack,
 930					   "Only one port policer allowed");
 931			return -EEXIST;
 932		}
 933	}
 934
 935	act = &cls->rule->action.entries[0];
 936
 937	mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 938	if (!mall_tc_entry)
 939		return -ENOMEM;
 940
 941	mall_tc_entry->cookie = cls->cookie;
 942	mall_tc_entry->type = DSA_PORT_MALL_POLICER;
 943	policer = &mall_tc_entry->policer;
 944	policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
 945	policer->burst = act->police.burst;
 946
 947	err = ds->ops->port_policer_add(ds, dp->index, policer);
 948	if (err) {
 949		kfree(mall_tc_entry);
 950		return err;
 951	}
 952
 953	list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
 954
 955	return err;
 956}
 957
 958static int dsa_slave_add_cls_matchall(struct net_device *dev,
 959				      struct tc_cls_matchall_offload *cls,
 960				      bool ingress)
 961{
 962	int err = -EOPNOTSUPP;
 963
 964	if (cls->common.protocol == htons(ETH_P_ALL) &&
 965	    flow_offload_has_one_action(&cls->rule->action) &&
 966	    cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
 967		err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
 968	else if (flow_offload_has_one_action(&cls->rule->action) &&
 969		 cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
 970		err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
 971
 972	return err;
 973}
 974
 975static void dsa_slave_del_cls_matchall(struct net_device *dev,
 976				       struct tc_cls_matchall_offload *cls)
 977{
 978	struct dsa_port *dp = dsa_slave_to_port(dev);
 979	struct dsa_mall_tc_entry *mall_tc_entry;
 980	struct dsa_switch *ds = dp->ds;
 981
 982	mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
 983	if (!mall_tc_entry)
 984		return;
 985
 986	list_del(&mall_tc_entry->list);
 987
 988	switch (mall_tc_entry->type) {
 989	case DSA_PORT_MALL_MIRROR:
 990		if (ds->ops->port_mirror_del)
 991			ds->ops->port_mirror_del(ds, dp->index,
 992						 &mall_tc_entry->mirror);
 993		break;
 994	case DSA_PORT_MALL_POLICER:
 995		if (ds->ops->port_policer_del)
 996			ds->ops->port_policer_del(ds, dp->index);
 997		break;
 998	default:
 999		WARN_ON(1);
1000	}
1001
1002	kfree(mall_tc_entry);
1003}
1004
1005static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1006					   struct tc_cls_matchall_offload *cls,
1007					   bool ingress)
1008{
1009	if (cls->common.chain_index)
1010		return -EOPNOTSUPP;
1011
1012	switch (cls->command) {
1013	case TC_CLSMATCHALL_REPLACE:
1014		return dsa_slave_add_cls_matchall(dev, cls, ingress);
1015	case TC_CLSMATCHALL_DESTROY:
1016		dsa_slave_del_cls_matchall(dev, cls);
1017		return 0;
1018	default:
1019		return -EOPNOTSUPP;
1020	}
1021}
1022
1023static int dsa_slave_add_cls_flower(struct net_device *dev,
1024				    struct flow_cls_offload *cls,
1025				    bool ingress)
1026{
1027	struct dsa_port *dp = dsa_slave_to_port(dev);
1028	struct dsa_switch *ds = dp->ds;
1029	int port = dp->index;
1030
1031	if (!ds->ops->cls_flower_add)
1032		return -EOPNOTSUPP;
1033
1034	return ds->ops->cls_flower_add(ds, port, cls, ingress);
1035}
1036
1037static int dsa_slave_del_cls_flower(struct net_device *dev,
1038				    struct flow_cls_offload *cls,
1039				    bool ingress)
1040{
1041	struct dsa_port *dp = dsa_slave_to_port(dev);
1042	struct dsa_switch *ds = dp->ds;
1043	int port = dp->index;
1044
1045	if (!ds->ops->cls_flower_del)
1046		return -EOPNOTSUPP;
1047
1048	return ds->ops->cls_flower_del(ds, port, cls, ingress);
1049}
1050
1051static int dsa_slave_stats_cls_flower(struct net_device *dev,
1052				      struct flow_cls_offload *cls,
1053				      bool ingress)
1054{
1055	struct dsa_port *dp = dsa_slave_to_port(dev);
1056	struct dsa_switch *ds = dp->ds;
1057	int port = dp->index;
1058
1059	if (!ds->ops->cls_flower_stats)
1060		return -EOPNOTSUPP;
1061
1062	return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1063}
1064
1065static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1066					 struct flow_cls_offload *cls,
1067					 bool ingress)
1068{
1069	switch (cls->command) {
1070	case FLOW_CLS_REPLACE:
1071		return dsa_slave_add_cls_flower(dev, cls, ingress);
1072	case FLOW_CLS_DESTROY:
1073		return dsa_slave_del_cls_flower(dev, cls, ingress);
1074	case FLOW_CLS_STATS:
1075		return dsa_slave_stats_cls_flower(dev, cls, ingress);
1076	default:
1077		return -EOPNOTSUPP;
1078	}
1079}
1080
1081static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1082				       void *cb_priv, bool ingress)
1083{
1084	struct net_device *dev = cb_priv;
1085
1086	if (!tc_can_offload(dev))
1087		return -EOPNOTSUPP;
1088
1089	switch (type) {
1090	case TC_SETUP_CLSMATCHALL:
1091		return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1092	case TC_SETUP_CLSFLOWER:
1093		return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1094	default:
1095		return -EOPNOTSUPP;
1096	}
1097}
1098
1099static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1100					  void *type_data, void *cb_priv)
1101{
1102	return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1103}
1104
1105static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1106					  void *type_data, void *cb_priv)
1107{
1108	return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1109}
1110
1111static LIST_HEAD(dsa_slave_block_cb_list);
1112
1113static int dsa_slave_setup_tc_block(struct net_device *dev,
1114				    struct flow_block_offload *f)
1115{
1116	struct flow_block_cb *block_cb;
1117	flow_setup_cb_t *cb;
1118
1119	if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1120		cb = dsa_slave_setup_tc_block_cb_ig;
1121	else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1122		cb = dsa_slave_setup_tc_block_cb_eg;
1123	else
1124		return -EOPNOTSUPP;
1125
1126	f->driver_block_list = &dsa_slave_block_cb_list;
1127
1128	switch (f->command) {
1129	case FLOW_BLOCK_BIND:
1130		if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1131			return -EBUSY;
1132
1133		block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1134		if (IS_ERR(block_cb))
1135			return PTR_ERR(block_cb);
1136
1137		flow_block_cb_add(block_cb, f);
1138		list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1139		return 0;
1140	case FLOW_BLOCK_UNBIND:
1141		block_cb = flow_block_cb_lookup(f->block, cb, dev);
1142		if (!block_cb)
1143			return -ENOENT;
1144
1145		flow_block_cb_remove(block_cb, f);
1146		list_del(&block_cb->driver_list);
1147		return 0;
1148	default:
1149		return -EOPNOTSUPP;
1150	}
1151}
1152
1153static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1154			      void *type_data)
1155{
1156	struct dsa_port *dp = dsa_slave_to_port(dev);
1157	struct dsa_switch *ds = dp->ds;
1158
1159	if (type == TC_SETUP_BLOCK)
1160		return dsa_slave_setup_tc_block(dev, type_data);
1161
1162	if (!ds->ops->port_setup_tc)
1163		return -EOPNOTSUPP;
1164
1165	return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1166}
1167
1168static void dsa_slave_get_stats64(struct net_device *dev,
1169				  struct rtnl_link_stats64 *stats)
1170{
1171	struct dsa_slave_priv *p = netdev_priv(dev);
1172	struct pcpu_sw_netstats *s;
1173	unsigned int start;
1174	int i;
1175
1176	netdev_stats_to_stats64(stats, &dev->stats);
1177	for_each_possible_cpu(i) {
1178		u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
1179
1180		s = per_cpu_ptr(p->stats64, i);
1181		do {
1182			start = u64_stats_fetch_begin_irq(&s->syncp);
1183			tx_packets = s->tx_packets;
1184			tx_bytes = s->tx_bytes;
1185			rx_packets = s->rx_packets;
1186			rx_bytes = s->rx_bytes;
1187		} while (u64_stats_fetch_retry_irq(&s->syncp, start));
1188
1189		stats->tx_packets += tx_packets;
1190		stats->tx_bytes += tx_bytes;
1191		stats->rx_packets += rx_packets;
1192		stats->rx_bytes += rx_bytes;
1193	}
1194}
1195
1196static int dsa_slave_get_rxnfc(struct net_device *dev,
1197			       struct ethtool_rxnfc *nfc, u32 *rule_locs)
1198{
1199	struct dsa_port *dp = dsa_slave_to_port(dev);
1200	struct dsa_switch *ds = dp->ds;
1201
1202	if (!ds->ops->get_rxnfc)
1203		return -EOPNOTSUPP;
1204
1205	return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1206}
1207
1208static int dsa_slave_set_rxnfc(struct net_device *dev,
1209			       struct ethtool_rxnfc *nfc)
1210{
1211	struct dsa_port *dp = dsa_slave_to_port(dev);
1212	struct dsa_switch *ds = dp->ds;
1213
1214	if (!ds->ops->set_rxnfc)
1215		return -EOPNOTSUPP;
1216
1217	return ds->ops->set_rxnfc(ds, dp->index, nfc);
1218}
1219
1220static int dsa_slave_get_ts_info(struct net_device *dev,
1221				 struct ethtool_ts_info *ts)
1222{
1223	struct dsa_slave_priv *p = netdev_priv(dev);
1224	struct dsa_switch *ds = p->dp->ds;
1225
1226	if (!ds->ops->get_ts_info)
1227		return -EOPNOTSUPP;
1228
1229	return ds->ops->get_ts_info(ds, p->dp->index, ts);
1230}
1231
1232static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1233				     u16 vid)
1234{
1235	struct dsa_port *dp = dsa_slave_to_port(dev);
1236	struct bridge_vlan_info info;
1237	int ret;
1238
1239	/* Check for a possible bridge VLAN entry now since there is no
1240	 * need to emulate the switchdev prepare + commit phase.
1241	 */
1242	if (dp->bridge_dev) {
1243		if (dsa_port_skip_vlan_configuration(dp))
1244			return 0;
1245
1246		/* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1247		 * device, respectively the VID is not found, returning
1248		 * 0 means success, which is a failure for us here.
1249		 */
1250		ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1251		if (ret == 0)
1252			return -EBUSY;
1253	}
1254
1255	ret = dsa_port_vid_add(dp, vid, 0);
1256	if (ret)
1257		return ret;
1258
1259	ret = dsa_port_vid_add(dp->cpu_dp, vid, 0);
1260	if (ret)
1261		return ret;
1262
1263	return 0;
1264}
1265
1266static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1267				      u16 vid)
1268{
1269	struct dsa_port *dp = dsa_slave_to_port(dev);
1270	struct bridge_vlan_info info;
1271	int ret;
1272
1273	/* Check for a possible bridge VLAN entry now since there is no
1274	 * need to emulate the switchdev prepare + commit phase.
1275	 */
1276	if (dp->bridge_dev) {
1277		if (dsa_port_skip_vlan_configuration(dp))
1278			return 0;
1279
1280		/* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1281		 * device, respectively the VID is not found, returning
1282		 * 0 means success, which is a failure for us here.
1283		 */
1284		ret = br_vlan_get_info(dp->bridge_dev, vid, &info);
1285		if (ret == 0)
1286			return -EBUSY;
1287	}
1288
1289	/* Do not deprogram the CPU port as it may be shared with other user
1290	 * ports which can be members of this VLAN as well.
1291	 */
1292	return dsa_port_vid_del(dp, vid);
1293}
1294
1295struct dsa_hw_port {
1296	struct list_head list;
1297	struct net_device *dev;
1298	int old_mtu;
1299};
1300
1301static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1302{
1303	const struct dsa_hw_port *p;
1304	int err;
1305
1306	list_for_each_entry(p, hw_port_list, list) {
1307		if (p->dev->mtu == mtu)
1308			continue;
1309
1310		err = dev_set_mtu(p->dev, mtu);
1311		if (err)
1312			goto rollback;
1313	}
1314
1315	return 0;
1316
1317rollback:
1318	list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1319		if (p->dev->mtu == p->old_mtu)
1320			continue;
1321
1322		if (dev_set_mtu(p->dev, p->old_mtu))
1323			netdev_err(p->dev, "Failed to restore MTU\n");
1324	}
1325
1326	return err;
1327}
1328
1329static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1330{
1331	struct dsa_hw_port *p, *n;
1332
1333	list_for_each_entry_safe(p, n, hw_port_list, list)
1334		kfree(p);
1335}
1336
1337/* Make the hardware datapath to/from @dev limited to a common MTU */
1338static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1339{
1340	struct list_head hw_port_list;
1341	struct dsa_switch_tree *dst;
1342	int min_mtu = ETH_MAX_MTU;
1343	struct dsa_port *other_dp;
1344	int err;
1345
1346	if (!dp->ds->mtu_enforcement_ingress)
1347		return;
1348
1349	if (!dp->bridge_dev)
1350		return;
1351
1352	INIT_LIST_HEAD(&hw_port_list);
1353
1354	/* Populate the list of ports that are part of the same bridge
1355	 * as the newly added/modified port
1356	 */
1357	list_for_each_entry(dst, &dsa_tree_list, list) {
1358		list_for_each_entry(other_dp, &dst->ports, list) {
1359			struct dsa_hw_port *hw_port;
1360			struct net_device *slave;
1361
1362			if (other_dp->type != DSA_PORT_TYPE_USER)
1363				continue;
1364
1365			if (other_dp->bridge_dev != dp->bridge_dev)
1366				continue;
1367
1368			if (!other_dp->ds->mtu_enforcement_ingress)
1369				continue;
1370
1371			slave = other_dp->slave;
1372
1373			if (min_mtu > slave->mtu)
1374				min_mtu = slave->mtu;
1375
1376			hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1377			if (!hw_port)
1378				goto out;
1379
1380			hw_port->dev = slave;
1381			hw_port->old_mtu = slave->mtu;
1382
1383			list_add(&hw_port->list, &hw_port_list);
1384		}
1385	}
1386
1387	/* Attempt to configure the entire hardware bridge to the newly added
1388	 * interface's MTU first, regardless of whether the intention of the
1389	 * user was to raise or lower it.
1390	 */
1391	err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1392	if (!err)
1393		goto out;
1394
1395	/* Clearly that didn't work out so well, so just set the minimum MTU on
1396	 * all hardware bridge ports now. If this fails too, then all ports will
1397	 * still have their old MTU rolled back anyway.
1398	 */
1399	dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1400
1401out:
1402	dsa_hw_port_list_free(&hw_port_list);
1403}
1404
1405static int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1406{
1407	struct net_device *master = dsa_slave_to_master(dev);
1408	struct dsa_port *dp = dsa_slave_to_port(dev);
1409	struct dsa_slave_priv *p = netdev_priv(dev);
1410	struct dsa_switch *ds = p->dp->ds;
1411	struct dsa_port *cpu_dp;
1412	int port = p->dp->index;
1413	int largest_mtu = 0;
1414	int new_master_mtu;
1415	int old_master_mtu;
1416	int mtu_limit;
1417	int cpu_mtu;
1418	int err, i;
1419
1420	if (!ds->ops->port_change_mtu)
1421		return -EOPNOTSUPP;
1422
1423	for (i = 0; i < ds->num_ports; i++) {
1424		int slave_mtu;
1425
1426		if (!dsa_is_user_port(ds, i))
1427			continue;
1428
1429		/* During probe, this function will be called for each slave
1430		 * device, while not all of them have been allocated. That's
1431		 * ok, it doesn't change what the maximum is, so ignore it.
1432		 */
1433		if (!dsa_to_port(ds, i)->slave)
1434			continue;
1435
1436		/* Pretend that we already applied the setting, which we
1437		 * actually haven't (still haven't done all integrity checks)
1438		 */
1439		if (i == port)
1440			slave_mtu = new_mtu;
1441		else
1442			slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1443
1444		if (largest_mtu < slave_mtu)
1445			largest_mtu = slave_mtu;
1446	}
1447
1448	cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1449
1450	mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1451	old_master_mtu = master->mtu;
1452	new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1453	if (new_master_mtu > mtu_limit)
1454		return -ERANGE;
1455
1456	/* If the master MTU isn't over limit, there's no need to check the CPU
1457	 * MTU, since that surely isn't either.
1458	 */
1459	cpu_mtu = largest_mtu;
1460
1461	/* Start applying stuff */
1462	if (new_master_mtu != old_master_mtu) {
1463		err = dev_set_mtu(master, new_master_mtu);
1464		if (err < 0)
1465			goto out_master_failed;
1466
1467		/* We only need to propagate the MTU of the CPU port to
1468		 * upstream switches.
1469		 */
1470		err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1471		if (err)
1472			goto out_cpu_failed;
1473	}
1474
1475	err = dsa_port_mtu_change(dp, new_mtu, false);
1476	if (err)
1477		goto out_port_failed;
1478
1479	dev->mtu = new_mtu;
1480
1481	dsa_bridge_mtu_normalization(dp);
1482
1483	return 0;
1484
1485out_port_failed:
1486	if (new_master_mtu != old_master_mtu)
1487		dsa_port_mtu_change(cpu_dp, old_master_mtu -
1488				    cpu_dp->tag_ops->overhead,
1489				    true);
1490out_cpu_failed:
1491	if (new_master_mtu != old_master_mtu)
1492		dev_set_mtu(master, old_master_mtu);
1493out_master_failed:
1494	return err;
1495}
1496
1497static const struct ethtool_ops dsa_slave_ethtool_ops = {
 
 
1498	.get_drvinfo		= dsa_slave_get_drvinfo,
1499	.get_regs_len		= dsa_slave_get_regs_len,
1500	.get_regs		= dsa_slave_get_regs,
1501	.nway_reset		= dsa_slave_nway_reset,
1502	.get_link		= ethtool_op_get_link,
1503	.get_eeprom_len		= dsa_slave_get_eeprom_len,
1504	.get_eeprom		= dsa_slave_get_eeprom,
1505	.set_eeprom		= dsa_slave_set_eeprom,
1506	.get_strings		= dsa_slave_get_strings,
1507	.get_ethtool_stats	= dsa_slave_get_ethtool_stats,
1508	.get_sset_count		= dsa_slave_get_sset_count,
1509	.set_wol		= dsa_slave_set_wol,
1510	.get_wol		= dsa_slave_get_wol,
1511	.set_eee		= dsa_slave_set_eee,
1512	.get_eee		= dsa_slave_get_eee,
1513	.get_link_ksettings	= dsa_slave_get_link_ksettings,
1514	.set_link_ksettings	= dsa_slave_set_link_ksettings,
1515	.get_pauseparam		= dsa_slave_get_pauseparam,
1516	.set_pauseparam		= dsa_slave_set_pauseparam,
1517	.get_rxnfc		= dsa_slave_get_rxnfc,
1518	.set_rxnfc		= dsa_slave_set_rxnfc,
1519	.get_ts_info		= dsa_slave_get_ts_info,
1520};
1521
1522/* legacy way, bypassing the bridge *****************************************/
1523int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1524		       struct net_device *dev,
1525		       const unsigned char *addr, u16 vid,
1526		       u16 flags,
1527		       struct netlink_ext_ack *extack)
1528{
1529	struct dsa_port *dp = dsa_slave_to_port(dev);
1530
1531	return dsa_port_fdb_add(dp, addr, vid);
1532}
1533
1534int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1535		       struct net_device *dev,
1536		       const unsigned char *addr, u16 vid)
1537{
1538	struct dsa_port *dp = dsa_slave_to_port(dev);
1539
1540	return dsa_port_fdb_del(dp, addr, vid);
1541}
1542
1543static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1544{
1545	struct dsa_port *dp = dsa_slave_to_port(dev);
1546
1547	return dp->ds->devlink ? &dp->devlink_port : NULL;
1548}
1549
1550static const struct net_device_ops dsa_slave_netdev_ops = {
1551	.ndo_open	 	= dsa_slave_open,
1552	.ndo_stop		= dsa_slave_close,
1553	.ndo_start_xmit		= dsa_slave_xmit,
1554	.ndo_change_rx_flags	= dsa_slave_change_rx_flags,
1555	.ndo_set_rx_mode	= dsa_slave_set_rx_mode,
1556	.ndo_set_mac_address	= dsa_slave_set_mac_address,
1557	.ndo_fdb_add		= dsa_legacy_fdb_add,
1558	.ndo_fdb_del		= dsa_legacy_fdb_del,
1559	.ndo_fdb_dump		= dsa_slave_fdb_dump,
1560	.ndo_do_ioctl		= dsa_slave_ioctl,
1561	.ndo_get_iflink		= dsa_slave_get_iflink,
1562#ifdef CONFIG_NET_POLL_CONTROLLER
1563	.ndo_netpoll_setup	= dsa_slave_netpoll_setup,
1564	.ndo_netpoll_cleanup	= dsa_slave_netpoll_cleanup,
1565	.ndo_poll_controller	= dsa_slave_poll_controller,
1566#endif
1567	.ndo_get_phys_port_name	= dsa_slave_get_phys_port_name,
1568	.ndo_setup_tc		= dsa_slave_setup_tc,
1569	.ndo_get_stats64	= dsa_slave_get_stats64,
1570	.ndo_get_port_parent_id	= dsa_slave_get_port_parent_id,
1571	.ndo_vlan_rx_add_vid	= dsa_slave_vlan_rx_add_vid,
1572	.ndo_vlan_rx_kill_vid	= dsa_slave_vlan_rx_kill_vid,
1573	.ndo_get_devlink_port	= dsa_slave_get_devlink_port,
1574	.ndo_change_mtu		= dsa_slave_change_mtu,
 
 
 
1575};
1576
1577static struct device_type dsa_type = {
1578	.name	= "dsa",
1579};
1580
1581void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1582{
1583	const struct dsa_port *dp = dsa_to_port(ds, port);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1584
1585	if (dp->pl)
1586		phylink_mac_change(dp->pl, up);
 
 
 
1587}
1588EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1589
1590static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1591					  struct phylink_link_state *state)
1592{
1593	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1594	struct dsa_switch *ds = dp->ds;
1595
1596	/* No need to check that this operation is valid, the callback would
1597	 * not be called if it was not.
1598	 */
1599	ds->ops->phylink_fixed_state(ds, dp->index, state);
 
 
 
 
1600}
1601
1602/* slave device setup *******************************************************/
1603static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
 
 
1604{
1605	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1606	struct dsa_switch *ds = dp->ds;
1607
1608	slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1609	if (!slave_dev->phydev) {
1610		netdev_err(slave_dev, "no phy at %d\n", addr);
1611		return -ENODEV;
1612	}
1613
1614	return phylink_connect_phy(dp->pl, slave_dev->phydev);
 
 
 
 
 
 
1615}
1616
1617static int dsa_slave_phy_setup(struct net_device *slave_dev)
 
1618{
1619	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1620	struct device_node *port_dn = dp->dn;
1621	struct dsa_switch *ds = dp->ds;
1622	phy_interface_t mode;
1623	u32 phy_flags = 0;
1624	int ret;
1625
1626	ret = of_get_phy_mode(port_dn, &mode);
1627	if (ret)
 
1628		mode = PHY_INTERFACE_MODE_NA;
 
1629
1630	dp->pl_config.dev = &slave_dev->dev;
1631	dp->pl_config.type = PHYLINK_NETDEV;
 
 
 
 
 
 
 
 
 
 
 
1632
1633	/* The get_fixed_state callback takes precedence over polling the
1634	 * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
1635	 * this if the switch provides such a callback.
1636	 */
1637	if (ds->ops->phylink_fixed_state) {
1638		dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1639		dp->pl_config.poll_fixed_state = true;
1640	}
1641
1642	dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1643				&dsa_port_phylink_mac_ops);
1644	if (IS_ERR(dp->pl)) {
1645		netdev_err(slave_dev,
1646			   "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1647		return PTR_ERR(dp->pl);
1648	}
1649
1650	if (ds->ops->get_phy_flags)
1651		phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1652
1653	ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1654	if (ret == -ENODEV && ds->slave_mii_bus) {
1655		/* We could not connect to a designated PHY or SFP, so try to
1656		 * use the switch internal MDIO bus instead
1657		 */
1658		ret = dsa_slave_phy_connect(slave_dev, dp->index);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1659		if (ret) {
1660			netdev_err(slave_dev,
1661				   "failed to connect to port %d: %d\n",
1662				   dp->index, ret);
1663			phylink_destroy(dp->pl);
1664			return ret;
1665		}
1666	}
1667
1668	return ret;
 
 
1669}
1670
1671static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1672static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1673					    struct netdev_queue *txq,
1674					    void *_unused)
1675{
1676	lockdep_set_class(&txq->_xmit_lock,
1677			  &dsa_slave_netdev_xmit_lock_key);
1678}
1679
1680int dsa_slave_suspend(struct net_device *slave_dev)
1681{
1682	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1683
1684	if (!netif_running(slave_dev))
1685		return 0;
1686
1687	netif_device_detach(slave_dev);
1688
1689	rtnl_lock();
1690	phylink_stop(dp->pl);
1691	rtnl_unlock();
 
 
 
 
1692
1693	return 0;
1694}
1695
1696int dsa_slave_resume(struct net_device *slave_dev)
1697{
1698	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1699
1700	if (!netif_running(slave_dev))
1701		return 0;
1702
1703	netif_device_attach(slave_dev);
1704
1705	rtnl_lock();
1706	phylink_start(dp->pl);
1707	rtnl_unlock();
 
1708
1709	return 0;
1710}
1711
1712static void dsa_slave_notify(struct net_device *dev, unsigned long val)
 
1713{
1714	struct net_device *master = dsa_slave_to_master(dev);
1715	struct dsa_port *dp = dsa_slave_to_port(dev);
1716	struct dsa_notifier_register_info rinfo = {
1717		.switch_number = dp->ds->index,
1718		.port_number = dp->index,
1719		.master = master,
1720		.info.dev = dev,
1721	};
1722
1723	call_dsa_notifiers(val, dev, &rinfo.info);
1724}
1725
1726int dsa_slave_create(struct dsa_port *port)
1727{
1728	const struct dsa_port *cpu_dp = port->cpu_dp;
1729	struct net_device *master = cpu_dp->master;
1730	struct dsa_switch *ds = port->ds;
1731	const char *name = port->name;
1732	struct net_device *slave_dev;
1733	struct dsa_slave_priv *p;
1734	int ret;
1735
1736	if (!ds->num_tx_queues)
1737		ds->num_tx_queues = 1;
1738
1739	slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1740				     NET_NAME_UNKNOWN, ether_setup,
1741				     ds->num_tx_queues, 1);
1742	if (slave_dev == NULL)
1743		return -ENOMEM;
1744
1745	slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1746	if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1747		slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1748	slave_dev->hw_features |= NETIF_F_HW_TC;
1749	slave_dev->features |= NETIF_F_LLTX;
1750	slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1751	if (!IS_ERR_OR_NULL(port->mac))
1752		ether_addr_copy(slave_dev->dev_addr, port->mac);
1753	else
1754		eth_hw_addr_inherit(slave_dev, master);
1755	slave_dev->priv_flags |= IFF_NO_QUEUE;
1756	slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1757	if (ds->ops->port_max_mtu)
1758		slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1759	SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1760
1761	netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1762				 NULL);
1763
1764	SET_NETDEV_DEV(slave_dev, port->ds->dev);
1765	slave_dev->dev.of_node = port->dn;
1766	slave_dev->vlan_features = master->vlan_features;
1767
1768	p = netdev_priv(slave_dev);
1769	p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1770	if (!p->stats64) {
1771		free_netdev(slave_dev);
1772		return -ENOMEM;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1773	}
1774
1775	ret = gro_cells_init(&p->gcells, slave_dev);
1776	if (ret)
1777		goto out_free;
1778
1779	p->dp = port;
1780	INIT_LIST_HEAD(&p->mall_tc_list);
1781	p->xmit = cpu_dp->tag_ops->xmit;
1782	port->slave = slave_dev;
1783
1784	rtnl_lock();
1785	ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1786	rtnl_unlock();
1787	if (ret)
1788		dev_warn(ds->dev, "nonfatal error %d setting MTU on port %d\n",
1789			 ret, port->index);
1790
1791	netif_carrier_off(slave_dev);
1792
1793	ret = dsa_slave_phy_setup(slave_dev);
 
1794	if (ret) {
1795		netdev_err(master, "error %d setting up slave PHY for %s\n",
1796			   ret, slave_dev->name);
1797		goto out_gcells;
 
 
1798	}
1799
1800	dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1801
1802	rtnl_lock();
1803
1804	ret = register_netdevice(slave_dev);
1805	if (ret) {
1806		netdev_err(master, "error %d registering interface %s\n",
1807			   ret, slave_dev->name);
1808		rtnl_unlock();
1809		goto out_phy;
1810	}
1811
1812	ret = netdev_upper_dev_link(master, slave_dev, NULL);
1813
1814	rtnl_unlock();
1815
1816	if (ret)
1817		goto out_unregister;
1818
1819	return 0;
1820
1821out_unregister:
1822	unregister_netdev(slave_dev);
1823out_phy:
1824	rtnl_lock();
1825	phylink_disconnect_phy(p->dp->pl);
1826	rtnl_unlock();
1827	phylink_destroy(p->dp->pl);
1828out_gcells:
1829	gro_cells_destroy(&p->gcells);
1830out_free:
1831	free_percpu(p->stats64);
1832	free_netdev(slave_dev);
1833	port->slave = NULL;
1834	return ret;
1835}
1836
1837void dsa_slave_destroy(struct net_device *slave_dev)
1838{
1839	struct net_device *master = dsa_slave_to_master(slave_dev);
1840	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1841	struct dsa_slave_priv *p = netdev_priv(slave_dev);
1842
1843	netif_carrier_off(slave_dev);
1844	rtnl_lock();
1845	netdev_upper_dev_unlink(master, slave_dev);
1846	unregister_netdevice(slave_dev);
1847	phylink_disconnect_phy(dp->pl);
1848	rtnl_unlock();
1849
1850	dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1851	phylink_destroy(dp->pl);
1852	gro_cells_destroy(&p->gcells);
1853	free_percpu(p->stats64);
1854	free_netdev(slave_dev);
1855}
1856
1857bool dsa_slave_dev_check(const struct net_device *dev)
1858{
1859	return dev->netdev_ops == &dsa_slave_netdev_ops;
1860}
1861
1862static int dsa_slave_changeupper(struct net_device *dev,
1863				 struct netdev_notifier_changeupper_info *info)
1864{
1865	struct dsa_port *dp = dsa_slave_to_port(dev);
1866	int err = NOTIFY_DONE;
1867
1868	if (netif_is_bridge_master(info->upper_dev)) {
1869		if (info->linking) {
1870			err = dsa_port_bridge_join(dp, info->upper_dev);
1871			if (!err)
1872				dsa_bridge_mtu_normalization(dp);
1873			err = notifier_from_errno(err);
1874		} else {
1875			dsa_port_bridge_leave(dp, info->upper_dev);
1876			err = NOTIFY_OK;
1877		}
1878	}
1879
1880	return err;
1881}
1882
1883static int dsa_slave_upper_vlan_check(struct net_device *dev,
1884				      struct netdev_notifier_changeupper_info *
1885				      info)
1886{
1887	struct netlink_ext_ack *ext_ack;
1888	struct net_device *slave;
1889	struct dsa_port *dp;
1890
1891	ext_ack = netdev_notifier_info_to_extack(&info->info);
1892
1893	if (!is_vlan_dev(dev))
1894		return NOTIFY_DONE;
1895
1896	slave = vlan_dev_real_dev(dev);
1897	if (!dsa_slave_dev_check(slave))
1898		return NOTIFY_DONE;
1899
1900	dp = dsa_slave_to_port(slave);
1901	if (!dp->bridge_dev)
1902		return NOTIFY_DONE;
1903
1904	/* Deny enslaving a VLAN device into a VLAN-aware bridge */
1905	if (br_vlan_enabled(dp->bridge_dev) &&
1906	    netif_is_bridge_master(info->upper_dev) && info->linking) {
1907		NL_SET_ERR_MSG_MOD(ext_ack,
1908				   "Cannot enslave VLAN device into VLAN aware bridge");
1909		return notifier_from_errno(-EINVAL);
1910	}
1911
1912	return NOTIFY_DONE;
1913}
1914
1915static int dsa_slave_netdevice_event(struct notifier_block *nb,
1916				     unsigned long event, void *ptr)
1917{
1918	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1919
1920	if (event == NETDEV_CHANGEUPPER) {
1921		if (!dsa_slave_dev_check(dev))
1922			return dsa_slave_upper_vlan_check(dev, ptr);
1923
1924		return dsa_slave_changeupper(dev, ptr);
1925	}
1926
1927	return NOTIFY_DONE;
1928}
1929
1930struct dsa_switchdev_event_work {
1931	struct work_struct work;
1932	struct switchdev_notifier_fdb_info fdb_info;
1933	struct net_device *dev;
1934	unsigned long event;
1935};
1936
1937static void dsa_slave_switchdev_event_work(struct work_struct *work)
1938{
1939	struct dsa_switchdev_event_work *switchdev_work =
1940		container_of(work, struct dsa_switchdev_event_work, work);
1941	struct net_device *dev = switchdev_work->dev;
1942	struct switchdev_notifier_fdb_info *fdb_info;
1943	struct dsa_port *dp = dsa_slave_to_port(dev);
1944	int err;
1945
1946	rtnl_lock();
1947	switch (switchdev_work->event) {
1948	case SWITCHDEV_FDB_ADD_TO_DEVICE:
1949		fdb_info = &switchdev_work->fdb_info;
1950		if (!fdb_info->added_by_user)
1951			break;
1952
1953		err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
1954		if (err) {
1955			netdev_dbg(dev, "fdb add failed err=%d\n", err);
1956			break;
1957		}
1958		fdb_info->offloaded = true;
1959		call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
1960					 &fdb_info->info, NULL);
1961		break;
1962
1963	case SWITCHDEV_FDB_DEL_TO_DEVICE:
1964		fdb_info = &switchdev_work->fdb_info;
1965		if (!fdb_info->added_by_user)
1966			break;
1967
1968		err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
1969		if (err) {
1970			netdev_dbg(dev, "fdb del failed err=%d\n", err);
1971			dev_close(dev);
1972		}
1973		break;
1974	}
1975	rtnl_unlock();
1976
1977	kfree(switchdev_work->fdb_info.addr);
1978	kfree(switchdev_work);
1979	dev_put(dev);
1980}
1981
1982static int
1983dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
1984				  switchdev_work,
1985				  const struct switchdev_notifier_fdb_info *
1986				  fdb_info)
1987{
1988	memcpy(&switchdev_work->fdb_info, fdb_info,
1989	       sizeof(switchdev_work->fdb_info));
1990	switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
1991	if (!switchdev_work->fdb_info.addr)
1992		return -ENOMEM;
1993	ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
1994			fdb_info->addr);
1995	return 0;
1996}
1997
1998/* Called under rcu_read_lock() */
1999static int dsa_slave_switchdev_event(struct notifier_block *unused,
2000				     unsigned long event, void *ptr)
2001{
2002	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2003	struct dsa_switchdev_event_work *switchdev_work;
2004	int err;
2005
2006	if (event == SWITCHDEV_PORT_ATTR_SET) {
2007		err = switchdev_handle_port_attr_set(dev, ptr,
2008						     dsa_slave_dev_check,
2009						     dsa_slave_port_attr_set);
2010		return notifier_from_errno(err);
2011	}
2012
2013	if (!dsa_slave_dev_check(dev))
2014		return NOTIFY_DONE;
2015
2016	switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2017	if (!switchdev_work)
2018		return NOTIFY_BAD;
2019
2020	INIT_WORK(&switchdev_work->work,
2021		  dsa_slave_switchdev_event_work);
2022	switchdev_work->dev = dev;
2023	switchdev_work->event = event;
2024
2025	switch (event) {
2026	case SWITCHDEV_FDB_ADD_TO_DEVICE:
2027	case SWITCHDEV_FDB_DEL_TO_DEVICE:
2028		if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
2029			goto err_fdb_work_init;
2030		dev_hold(dev);
2031		break;
2032	default:
2033		kfree(switchdev_work);
2034		return NOTIFY_DONE;
2035	}
2036
2037	dsa_schedule_work(&switchdev_work->work);
2038	return NOTIFY_OK;
2039
2040err_fdb_work_init:
2041	kfree(switchdev_work);
2042	return NOTIFY_BAD;
2043}
2044
2045static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2046					      unsigned long event, void *ptr)
2047{
2048	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2049	int err;
2050
2051	switch (event) {
2052	case SWITCHDEV_PORT_OBJ_ADD:
2053		err = switchdev_handle_port_obj_add(dev, ptr,
2054						    dsa_slave_dev_check,
2055						    dsa_slave_port_obj_add);
2056		return notifier_from_errno(err);
2057	case SWITCHDEV_PORT_OBJ_DEL:
2058		err = switchdev_handle_port_obj_del(dev, ptr,
2059						    dsa_slave_dev_check,
2060						    dsa_slave_port_obj_del);
2061		return notifier_from_errno(err);
2062	case SWITCHDEV_PORT_ATTR_SET:
2063		err = switchdev_handle_port_attr_set(dev, ptr,
2064						     dsa_slave_dev_check,
2065						     dsa_slave_port_attr_set);
2066		return notifier_from_errno(err);
2067	}
2068
2069	return NOTIFY_DONE;
2070}
2071
2072static struct notifier_block dsa_slave_nb __read_mostly = {
2073	.notifier_call  = dsa_slave_netdevice_event,
2074};
2075
2076static struct notifier_block dsa_slave_switchdev_notifier = {
2077	.notifier_call = dsa_slave_switchdev_event,
2078};
2079
2080static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2081	.notifier_call = dsa_slave_switchdev_blocking_event,
2082};
2083
2084int dsa_slave_register_notifier(void)
2085{
2086	struct notifier_block *nb;
2087	int err;
2088
2089	err = register_netdevice_notifier(&dsa_slave_nb);
2090	if (err)
2091		return err;
2092
2093	err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2094	if (err)
2095		goto err_switchdev_nb;
2096
2097	nb = &dsa_slave_switchdev_blocking_notifier;
2098	err = register_switchdev_blocking_notifier(nb);
2099	if (err)
2100		goto err_switchdev_blocking_nb;
2101
2102	return 0;
2103
2104err_switchdev_blocking_nb:
2105	unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2106err_switchdev_nb:
2107	unregister_netdevice_notifier(&dsa_slave_nb);
2108	return err;
2109}
2110
2111void dsa_slave_unregister_notifier(void)
2112{
2113	struct notifier_block *nb;
2114	int err;
2115
2116	nb = &dsa_slave_switchdev_blocking_notifier;
2117	err = unregister_switchdev_blocking_notifier(nb);
2118	if (err)
2119		pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2120
2121	err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2122	if (err)
2123		pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2124
2125	err = unregister_netdevice_notifier(&dsa_slave_nb);
2126	if (err)
2127		pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2128}