/*
   * net/dsa/slave.c - Slave device handling

   * Copyright (c) 2008-2009 Marvell Semiconductor

   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   */
  
  #include <linux/list.h>

  #include <linux/etherdevice.h>

  #include <linux/netdevice.h>

  #include <linux/phy.h>

  #include <linux/phy_fixed.h>

  #include <linux/of_net.h>
  #include <linux/of_mdio.h>

  #include <linux/mdio.h>

  #include <net/rtnetlink.h>

  #include <net/switchdev.h>

  #include <linux/if_bridge.h>

  #include <linux/netpoll.h>

  #include "dsa_priv.h"
  
  /* slave mii_bus handling ***************************************************/
  static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  {
  	struct dsa_switch *ds = bus->priv;

  	if (ds->phys_mii_mask & (1 << addr))

  		return ds->ops->phy_read(ds, addr, reg);

  
  	return 0xffff;
  }
  
  static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  {
  	struct dsa_switch *ds = bus->priv;

  	if (ds->phys_mii_mask & (1 << addr))

  		return ds->ops->phy_write(ds, addr, reg, val);

  
  	return 0;
  }
  
  void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  {
  	ds->slave_mii_bus->priv = (void *)ds;
  	ds->slave_mii_bus->name = "dsa slave smi";
  	ds->slave_mii_bus->read = dsa_slave_phy_read;
  	ds->slave_mii_bus->write = dsa_slave_phy_write;

  	snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  		 ds->dst->tree, ds->index);

  	ds->slave_mii_bus->parent = ds->dev;

  	ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;

  }
  
  
  /* slave device handling ****************************************************/

  static int dsa_slave_get_iflink(const struct net_device *dev)

  {
  	struct dsa_slave_priv *p = netdev_priv(dev);

  	return p->parent->dst->master_netdev->ifindex;

  }

  static inline bool dsa_port_is_bridged(struct dsa_slave_priv *p)
  {
  	return !!p->bridge_dev;
  }

  static void dsa_port_set_stp_state(struct dsa_switch *ds, int port, u8 state)
  {

  	struct dsa_port *dp = &ds->ports[port];

  	if (ds->ops->port_stp_state_set)
  		ds->ops->port_stp_state_set(ds, port, state);

  
  	if (ds->ops->port_fast_age) {
  		/* Fast age FDB entries or flush appropriate forwarding database
  		 * for the given port, if we are moving it from Learning or
  		 * Forwarding state, to Disabled or Blocking or Listening state.
  		 */
  
  		if ((dp->stp_state == BR_STATE_LEARNING ||
  		     dp->stp_state == BR_STATE_FORWARDING) &&
  		    (state == BR_STATE_DISABLED ||
  		     state == BR_STATE_BLOCKING ||
  		     state == BR_STATE_LISTENING))
  			ds->ops->port_fast_age(ds, port);
  	}
  
  	dp->stp_state = state;

  }

  static int dsa_slave_open(struct net_device *dev)
  {

  	struct dsa_slave_priv *p = netdev_priv(dev);

  	struct net_device *master = p->parent->dst->master_netdev;

  	struct dsa_switch *ds = p->parent;

  	u8 stp_state = dsa_port_is_bridged(p) ?
  			BR_STATE_BLOCKING : BR_STATE_FORWARDING;

  	int err;
  
  	if (!(master->flags & IFF_UP))
  		return -ENETDOWN;

  	if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {

  		err = dev_uc_add(master, dev->dev_addr);

  		if (err < 0)
  			goto out;
  	}
  
  	if (dev->flags & IFF_ALLMULTI) {
  		err = dev_set_allmulti(master, 1);
  		if (err < 0)
  			goto del_unicast;
  	}
  	if (dev->flags & IFF_PROMISC) {
  		err = dev_set_promiscuity(master, 1);
  		if (err < 0)
  			goto clear_allmulti;
  	}

  	if (ds->ops->port_enable) {
  		err = ds->ops->port_enable(ds, p->port, p->phy);

  		if (err)
  			goto clear_promisc;
  	}

  	dsa_port_set_stp_state(ds, p->port, stp_state);

  	if (p->phy)
  		phy_start(p->phy);

  	return 0;

  clear_promisc:
  	if (dev->flags & IFF_PROMISC)

  		dev_set_promiscuity(master, -1);

  clear_allmulti:
  	if (dev->flags & IFF_ALLMULTI)
  		dev_set_allmulti(master, -1);
  del_unicast:

  	if (!ether_addr_equal(dev->dev_addr, master->dev_addr))

  		dev_uc_del(master, dev->dev_addr);

  out:
  	return err;

  }
  
  static int dsa_slave_close(struct net_device *dev)
  {

  	struct dsa_slave_priv *p = netdev_priv(dev);

  	struct net_device *master = p->parent->dst->master_netdev;

  	struct dsa_switch *ds = p->parent;

  	if (p->phy)
  		phy_stop(p->phy);

  	dev_mc_unsync(master, dev);

  	dev_uc_unsync(master, dev);

  	if (dev->flags & IFF_ALLMULTI)
  		dev_set_allmulti(master, -1);
  	if (dev->flags & IFF_PROMISC)
  		dev_set_promiscuity(master, -1);

  	if (!ether_addr_equal(dev->dev_addr, master->dev_addr))

  		dev_uc_del(master, dev->dev_addr);

  	if (ds->ops->port_disable)
  		ds->ops->port_disable(ds, p->port, p->phy);

  	dsa_port_set_stp_state(ds, p->port, BR_STATE_DISABLED);

  	return 0;
  }
  
  static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);

  	struct net_device *master = p->parent->dst->master_netdev;

  
  	if (change & IFF_ALLMULTI)
  		dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
  	if (change & IFF_PROMISC)
  		dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
  }
  
  static void dsa_slave_set_rx_mode(struct net_device *dev)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);

  	struct net_device *master = p->parent->dst->master_netdev;

  
  	dev_mc_sync(master, dev);

  	dev_uc_sync(master, dev);

  }

  static int dsa_slave_set_mac_address(struct net_device *dev, void *a)

  {

  	struct dsa_slave_priv *p = netdev_priv(dev);

  	struct net_device *master = p->parent->dst->master_netdev;

  	struct sockaddr *addr = a;
  	int err;
  
  	if (!is_valid_ether_addr(addr->sa_data))
  		return -EADDRNOTAVAIL;
  
  	if (!(dev->flags & IFF_UP))
  		goto out;

  	if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {

  		err = dev_uc_add(master, addr->sa_data);

  		if (err < 0)
  			return err;
  	}

  	if (!ether_addr_equal(dev->dev_addr, master->dev_addr))

  		dev_uc_del(master, dev->dev_addr);

  
  out:

  	ether_addr_copy(dev->dev_addr, addr->sa_data);

  
  	return 0;
  }

  static int dsa_slave_port_vlan_add(struct net_device *dev,

  				   const struct switchdev_obj_port_vlan *vlan,

  				   struct switchdev_trans *trans)

  {

  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (switchdev_trans_ph_prepare(trans)) {

  		if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)

  			return -EOPNOTSUPP;

  		return ds->ops->port_vlan_prepare(ds, p->port, vlan, trans);

  	}

  	ds->ops->port_vlan_add(ds, p->port, vlan, trans);

  	return 0;
  }
  
  static int dsa_slave_port_vlan_del(struct net_device *dev,

  				   const struct switchdev_obj_port_vlan *vlan)

  {

  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (!ds->ops->port_vlan_del)

  		return -EOPNOTSUPP;

  	return ds->ops->port_vlan_del(ds, p->port, vlan);

  }
  
  static int dsa_slave_port_vlan_dump(struct net_device *dev,

  				    struct switchdev_obj_port_vlan *vlan,

  				    switchdev_obj_dump_cb_t *cb)

  {

  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (ds->ops->port_vlan_dump)
  		return ds->ops->port_vlan_dump(ds, p->port, vlan, cb);

  	return -EOPNOTSUPP;

  }

  static int dsa_slave_port_fdb_add(struct net_device *dev,

  				  const struct switchdev_obj_port_fdb *fdb,

  				  struct switchdev_trans *trans)

  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (switchdev_trans_ph_prepare(trans)) {

  		if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add)

  			return -EOPNOTSUPP;

  		return ds->ops->port_fdb_prepare(ds, p->port, fdb, trans);

  	}

  	ds->ops->port_fdb_add(ds, p->port, fdb, trans);

  	return 0;

  }

  static int dsa_slave_port_fdb_del(struct net_device *dev,

  				  const struct switchdev_obj_port_fdb *fdb)

  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  	int ret = -EOPNOTSUPP;

  	if (ds->ops->port_fdb_del)
  		ret = ds->ops->port_fdb_del(ds, p->port, fdb);

  
  	return ret;
  }

  static int dsa_slave_port_fdb_dump(struct net_device *dev,

  				   struct switchdev_obj_port_fdb *fdb,

  				   switchdev_obj_dump_cb_t *cb)

  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (ds->ops->port_fdb_dump)
  		return ds->ops->port_fdb_dump(ds, p->port, fdb, cb);

  	return -EOPNOTSUPP;

  }

  static int dsa_slave_port_mdb_add(struct net_device *dev,
  				  const struct switchdev_obj_port_mdb *mdb,
  				  struct switchdev_trans *trans)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  
  	if (switchdev_trans_ph_prepare(trans)) {
  		if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
  			return -EOPNOTSUPP;
  
  		return ds->ops->port_mdb_prepare(ds, p->port, mdb, trans);
  	}
  
  	ds->ops->port_mdb_add(ds, p->port, mdb, trans);
  
  	return 0;
  }
  
  static int dsa_slave_port_mdb_del(struct net_device *dev,
  				  const struct switchdev_obj_port_mdb *mdb)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  
  	if (ds->ops->port_mdb_del)
  		return ds->ops->port_mdb_del(ds, p->port, mdb);
  
  	return -EOPNOTSUPP;
  }
  
  static int dsa_slave_port_mdb_dump(struct net_device *dev,
  				   struct switchdev_obj_port_mdb *mdb,
  				   switchdev_obj_dump_cb_t *cb)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  
  	if (ds->ops->port_mdb_dump)
  		return ds->ops->port_mdb_dump(ds, p->port, mdb, cb);
  
  	return -EOPNOTSUPP;
  }

  static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);

  
  	if (p->phy != NULL)

  		return phy_mii_ioctl(p->phy, ifr, cmd);

  
  	return -EOPNOTSUPP;
  }

  static int dsa_slave_stp_state_set(struct net_device *dev,
  				   const struct switchdev_attr *attr,
  				   struct switchdev_trans *trans)

  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (switchdev_trans_ph_prepare(trans))

  		return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;

  	dsa_port_set_stp_state(ds, p->port, attr->u.stp_state);

  
  	return 0;

  }

  static int dsa_slave_vlan_filtering(struct net_device *dev,
  				    const struct switchdev_attr *attr,
  				    struct switchdev_trans *trans)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  
  	/* bridge skips -EOPNOTSUPP, so skip the prepare phase */
  	if (switchdev_trans_ph_prepare(trans))
  		return 0;

  	if (ds->ops->port_vlan_filtering)
  		return ds->ops->port_vlan_filtering(ds, p->port,

  						    attr->u.vlan_filtering);
  
  	return 0;
  }

  static int dsa_fastest_ageing_time(struct dsa_switch *ds,
  				   unsigned int ageing_time)
  {
  	int i;
  
  	for (i = 0; i < DSA_MAX_PORTS; ++i) {
  		struct dsa_port *dp = &ds->ports[i];
  
  		if (dp && dp->ageing_time && dp->ageing_time < ageing_time)
  			ageing_time = dp->ageing_time;
  	}
  
  	return ageing_time;
  }
  
  static int dsa_slave_ageing_time(struct net_device *dev,
  				 const struct switchdev_attr *attr,
  				 struct switchdev_trans *trans)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  	unsigned long ageing_jiffies = clock_t_to_jiffies(attr->u.ageing_time);
  	unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
  
  	/* bridge skips -EOPNOTSUPP, so skip the prepare phase */
  	if (switchdev_trans_ph_prepare(trans))
  		return 0;
  
  	/* Keep the fastest ageing time in case of multiple bridges */
  	ds->ports[p->port].ageing_time = ageing_time;
  	ageing_time = dsa_fastest_ageing_time(ds, ageing_time);

  	if (ds->ops->set_ageing_time)
  		return ds->ops->set_ageing_time(ds, ageing_time);

  
  	return 0;
  }

  static int dsa_slave_port_attr_set(struct net_device *dev,

  				   const struct switchdev_attr *attr,

  				   struct switchdev_trans *trans)

  {

  	int ret;

  
  	switch (attr->id) {

  	case SWITCHDEV_ATTR_ID_PORT_STP_STATE:

  		ret = dsa_slave_stp_state_set(dev, attr, trans);

  		break;

  	case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
  		ret = dsa_slave_vlan_filtering(dev, attr, trans);
  		break;

  	case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
  		ret = dsa_slave_ageing_time(dev, attr, trans);
  		break;

  	default:
  		ret = -EOPNOTSUPP;
  		break;
  	}
  
  	return ret;
  }

  static int dsa_slave_port_obj_add(struct net_device *dev,

  				  const struct switchdev_obj *obj,

  				  struct switchdev_trans *trans)

  {
  	int err;
  
  	/* For the prepare phase, ensure the full set of changes is feasable in
  	 * one go in order to signal a failure properly. If an operation is not
  	 * supported, return -EOPNOTSUPP.
  	 */

  	switch (obj->id) {

  	case SWITCHDEV_OBJ_ID_PORT_FDB:

  		err = dsa_slave_port_fdb_add(dev,
  					     SWITCHDEV_OBJ_PORT_FDB(obj),
  					     trans);

  		break;

  	case SWITCHDEV_OBJ_ID_PORT_MDB:
  		err = dsa_slave_port_mdb_add(dev, SWITCHDEV_OBJ_PORT_MDB(obj),
  					     trans);
  		break;

  	case SWITCHDEV_OBJ_ID_PORT_VLAN:

  		err = dsa_slave_port_vlan_add(dev,
  					      SWITCHDEV_OBJ_PORT_VLAN(obj),
  					      trans);

  		break;

  	default:
  		err = -EOPNOTSUPP;
  		break;
  	}
  
  	return err;
  }
  
  static int dsa_slave_port_obj_del(struct net_device *dev,

  				  const struct switchdev_obj *obj)

  {
  	int err;

  	switch (obj->id) {

  	case SWITCHDEV_OBJ_ID_PORT_FDB:

  		err = dsa_slave_port_fdb_del(dev,
  					     SWITCHDEV_OBJ_PORT_FDB(obj));

  		break;

  	case SWITCHDEV_OBJ_ID_PORT_MDB:
  		err = dsa_slave_port_mdb_del(dev, SWITCHDEV_OBJ_PORT_MDB(obj));
  		break;

  	case SWITCHDEV_OBJ_ID_PORT_VLAN:

  		err = dsa_slave_port_vlan_del(dev,
  					      SWITCHDEV_OBJ_PORT_VLAN(obj));

  		break;

  	default:
  		err = -EOPNOTSUPP;
  		break;
  	}
  
  	return err;
  }
  
  static int dsa_slave_port_obj_dump(struct net_device *dev,

  				   struct switchdev_obj *obj,
  				   switchdev_obj_dump_cb_t *cb)

  {
  	int err;

  	switch (obj->id) {

  	case SWITCHDEV_OBJ_ID_PORT_FDB:

  		err = dsa_slave_port_fdb_dump(dev,
  					      SWITCHDEV_OBJ_PORT_FDB(obj),
  					      cb);

  		break;

  	case SWITCHDEV_OBJ_ID_PORT_MDB:
  		err = dsa_slave_port_mdb_dump(dev, SWITCHDEV_OBJ_PORT_MDB(obj),
  					      cb);
  		break;

  	case SWITCHDEV_OBJ_ID_PORT_VLAN:

  		err = dsa_slave_port_vlan_dump(dev,
  					       SWITCHDEV_OBJ_PORT_VLAN(obj),
  					       cb);

  		break;

  	default:
  		err = -EOPNOTSUPP;
  		break;
  	}
  
  	return err;
  }

  static int dsa_slave_bridge_port_join(struct net_device *dev,
  				      struct net_device *br)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  	int ret = -EOPNOTSUPP;
  
  	p->bridge_dev = br;

  	if (ds->ops->port_bridge_join)
  		ret = ds->ops->port_bridge_join(ds, p->port, br);

  	return ret == -EOPNOTSUPP ? 0 : ret;

  }

  static void dsa_slave_bridge_port_leave(struct net_device *dev)

  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (ds->ops->port_bridge_leave)
  		ds->ops->port_bridge_leave(ds, p->port);

  
  	p->bridge_dev = NULL;
  
  	/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
  	 * so allow it to be in BR_STATE_FORWARDING to be kept functional
  	 */

  	dsa_port_set_stp_state(ds, p->port, BR_STATE_FORWARDING);

  }

  static int dsa_slave_port_attr_get(struct net_device *dev,
  				   struct switchdev_attr *attr)

  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	switch (attr->id) {

  	case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:

  		attr->u.ppid.id_len = sizeof(ds->index);
  		memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);

  		break;
  	default:
  		return -EOPNOTSUPP;
  	}

  
  	return 0;
  }

  static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
  					       struct sk_buff *skb)
  {
  #ifdef CONFIG_NET_POLL_CONTROLLER
  	if (p->netpoll)
  		netpoll_send_skb(p->netpoll, skb);
  #else
  	BUG();
  #endif
  	return NETDEV_TX_OK;
  }

  static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);

  	struct sk_buff *nskb;

  	dev->stats.tx_packets++;
  	dev->stats.tx_bytes += skb->len;

  	/* Transmit function may have to reallocate the original SKB */
  	nskb = p->xmit(skb, dev);
  	if (!nskb)
  		return NETDEV_TX_OK;

  	/* SKB for netpoll still need to be mangled with the protocol-specific
  	 * tag to be successfully transmitted
  	 */
  	if (unlikely(netpoll_tx_running(dev)))
  		return dsa_netpoll_send_skb(p, nskb);

  	/* Queue the SKB for transmission on the parent interface, but
  	 * do not modify its EtherType
  	 */
  	nskb->dev = p->parent->dst->master_netdev;
  	dev_queue_xmit(nskb);

  
  	return NETDEV_TX_OK;
  }

  /* ethtool operations *******************************************************/
  static int
  dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	int err;
  
  	err = -EOPNOTSUPP;
  	if (p->phy != NULL) {
  		err = phy_read_status(p->phy);
  		if (err == 0)
  			err = phy_ethtool_gset(p->phy, cmd);
  	}
  
  	return err;
  }
  
  static int
  dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  
  	if (p->phy != NULL)
  		return phy_ethtool_sset(p->phy, cmd);
  
  	return -EOPNOTSUPP;
  }
  
  static void dsa_slave_get_drvinfo(struct net_device *dev,
  				  struct ethtool_drvinfo *drvinfo)
  {

  	strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
  	strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
  	strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
  	strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));

  }

  static int dsa_slave_get_regs_len(struct net_device *dev)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (ds->ops->get_regs_len)
  		return ds->ops->get_regs_len(ds, p->port);

  
  	return -EOPNOTSUPP;
  }
  
  static void
  dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (ds->ops->get_regs)
  		ds->ops->get_regs(ds, p->port, regs, _p);

  }

  static int dsa_slave_nway_reset(struct net_device *dev)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  
  	if (p->phy != NULL)
  		return genphy_restart_aneg(p->phy);
  
  	return -EOPNOTSUPP;
  }
  
  static u32 dsa_slave_get_link(struct net_device *dev)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  
  	if (p->phy != NULL) {
  		genphy_update_link(p->phy);
  		return p->phy->link;
  	}
  
  	return -EOPNOTSUPP;
  }

  static int dsa_slave_get_eeprom_len(struct net_device *dev)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (ds->cd && ds->cd->eeprom_len)

  		return ds->cd->eeprom_len;

  	if (ds->ops->get_eeprom_len)
  		return ds->ops->get_eeprom_len(ds);

  
  	return 0;
  }
  
  static int dsa_slave_get_eeprom(struct net_device *dev,
  				struct ethtool_eeprom *eeprom, u8 *data)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (ds->ops->get_eeprom)
  		return ds->ops->get_eeprom(ds, eeprom, data);

  
  	return -EOPNOTSUPP;
  }
  
  static int dsa_slave_set_eeprom(struct net_device *dev,
  				struct ethtool_eeprom *eeprom, u8 *data)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (ds->ops->set_eeprom)
  		return ds->ops->set_eeprom(ds, eeprom, data);

  
  	return -EOPNOTSUPP;
  }

  static void dsa_slave_get_strings(struct net_device *dev,
  				  uint32_t stringset, uint8_t *data)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  
  	if (stringset == ETH_SS_STATS) {
  		int len = ETH_GSTRING_LEN;
  
  		strncpy(data, "tx_packets", len);
  		strncpy(data + len, "tx_bytes", len);
  		strncpy(data + 2 * len, "rx_packets", len);
  		strncpy(data + 3 * len, "rx_bytes", len);

  		if (ds->ops->get_strings)
  			ds->ops->get_strings(ds, p->port, data + 4 * len);

  	}
  }

  static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
  					   struct ethtool_stats *stats,
  					   uint64_t *data)
  {
  	struct dsa_switch_tree *dst = dev->dsa_ptr;
  	struct dsa_switch *ds = dst->ds[0];
  	s8 cpu_port = dst->cpu_port;
  	int count = 0;
  
  	if (dst->master_ethtool_ops.get_sset_count) {
  		count = dst->master_ethtool_ops.get_sset_count(dev,
  							       ETH_SS_STATS);
  		dst->master_ethtool_ops.get_ethtool_stats(dev, stats, data);
  	}

  	if (ds->ops->get_ethtool_stats)
  		ds->ops->get_ethtool_stats(ds, cpu_port, data + count);

  }
  
  static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
  {
  	struct dsa_switch_tree *dst = dev->dsa_ptr;
  	struct dsa_switch *ds = dst->ds[0];
  	int count = 0;
  
  	if (dst->master_ethtool_ops.get_sset_count)
  		count += dst->master_ethtool_ops.get_sset_count(dev, sset);

  	if (sset == ETH_SS_STATS && ds->ops->get_sset_count)
  		count += ds->ops->get_sset_count(ds);

  
  	return count;
  }
  
  static void dsa_cpu_port_get_strings(struct net_device *dev,
  				     uint32_t stringset, uint8_t *data)
  {
  	struct dsa_switch_tree *dst = dev->dsa_ptr;
  	struct dsa_switch *ds = dst->ds[0];
  	s8 cpu_port = dst->cpu_port;
  	int len = ETH_GSTRING_LEN;
  	int mcount = 0, count;
  	unsigned int i;
  	uint8_t pfx[4];
  	uint8_t *ndata;
  
  	snprintf(pfx, sizeof(pfx), "p%.2d", cpu_port);
  	/* We do not want to be NULL-terminated, since this is a prefix */
  	pfx[sizeof(pfx) - 1] = '_';
  
  	if (dst->master_ethtool_ops.get_sset_count) {
  		mcount = dst->master_ethtool_ops.get_sset_count(dev,
  								ETH_SS_STATS);
  		dst->master_ethtool_ops.get_strings(dev, stringset, data);
  	}

  	if (stringset == ETH_SS_STATS && ds->ops->get_strings) {

  		ndata = data + mcount * len;
  		/* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
  		 * the output after to prepend our CPU port prefix we
  		 * constructed earlier
  		 */

  		ds->ops->get_strings(ds, cpu_port, ndata);
  		count = ds->ops->get_sset_count(ds);

  		for (i = 0; i < count; i++) {
  			memmove(ndata + (i * len + sizeof(pfx)),
  				ndata + i * len, len - sizeof(pfx));
  			memcpy(ndata + i * len, pfx, sizeof(pfx));
  		}
  	}
  }

  static void dsa_slave_get_ethtool_stats(struct net_device *dev,
  					struct ethtool_stats *stats,
  					uint64_t *data)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	data[0] = dev->stats.tx_packets;
  	data[1] = dev->stats.tx_bytes;
  	data[2] = dev->stats.rx_packets;
  	data[3] = dev->stats.rx_bytes;

  	if (ds->ops->get_ethtool_stats)
  		ds->ops->get_ethtool_stats(ds, p->port, data + 4);

  }
  
  static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  
  	if (sset == ETH_SS_STATS) {
  		int count;
  
  		count = 4;

  		if (ds->ops->get_sset_count)
  			count += ds->ops->get_sset_count(ds);

  
  		return count;
  	}
  
  	return -EOPNOTSUPP;
  }

  static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;

  	if (ds->ops->get_wol)
  		ds->ops->get_wol(ds, p->port, w);

  }
  
  static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  	int ret = -EOPNOTSUPP;

  	if (ds->ops->set_wol)
  		ret = ds->ops->set_wol(ds, p->port, w);

  
  	return ret;
  }

  static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  	int ret;

  	if (!ds->ops->set_eee)

  		return -EOPNOTSUPP;

  	ret = ds->ops->set_eee(ds, p->port, p->phy, e);

  	if (ret)
  		return ret;
  
  	if (p->phy)
  		ret = phy_ethtool_set_eee(p->phy, e);
  
  	return ret;
  }
  
  static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  	int ret;

  	if (!ds->ops->get_eee)

  		return -EOPNOTSUPP;

  	ret = ds->ops->get_eee(ds, p->port, e);

  	if (ret)
  		return ret;
  
  	if (p->phy)
  		ret = phy_ethtool_get_eee(p->phy, e);
  
  	return ret;
  }

  #ifdef CONFIG_NET_POLL_CONTROLLER
  static int dsa_slave_netpoll_setup(struct net_device *dev,
  				   struct netpoll_info *ni)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct dsa_switch *ds = p->parent;
  	struct net_device *master = ds->dst->master_netdev;
  	struct netpoll *netpoll;
  	int err = 0;
  
  	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
  	if (!netpoll)
  		return -ENOMEM;
  
  	err = __netpoll_setup(netpoll, master);
  	if (err) {
  		kfree(netpoll);
  		goto out;
  	}
  
  	p->netpoll = netpoll;
  out:
  	return err;
  }
  
  static void dsa_slave_netpoll_cleanup(struct net_device *dev)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);
  	struct netpoll *netpoll = p->netpoll;
  
  	if (!netpoll)
  		return;
  
  	p->netpoll = NULL;
  
  	__netpoll_free_async(netpoll);
  }
  
  static void dsa_slave_poll_controller(struct net_device *dev)
  {
  }
  #endif

  void dsa_cpu_port_ethtool_init(struct ethtool_ops *ops)
  {
  	ops->get_sset_count = dsa_cpu_port_get_sset_count;
  	ops->get_ethtool_stats = dsa_cpu_port_get_ethtool_stats;
  	ops->get_strings = dsa_cpu_port_get_strings;
  }

  static const struct ethtool_ops dsa_slave_ethtool_ops = {
  	.get_settings		= dsa_slave_get_settings,
  	.set_settings		= dsa_slave_set_settings,
  	.get_drvinfo		= dsa_slave_get_drvinfo,

  	.get_regs_len		= dsa_slave_get_regs_len,
  	.get_regs		= dsa_slave_get_regs,

  	.nway_reset		= dsa_slave_nway_reset,
  	.get_link		= dsa_slave_get_link,

  	.get_eeprom_len		= dsa_slave_get_eeprom_len,
  	.get_eeprom		= dsa_slave_get_eeprom,
  	.set_eeprom		= dsa_slave_set_eeprom,

  	.get_strings		= dsa_slave_get_strings,
  	.get_ethtool_stats	= dsa_slave_get_ethtool_stats,
  	.get_sset_count		= dsa_slave_get_sset_count,

  	.set_wol		= dsa_slave_set_wol,
  	.get_wol		= dsa_slave_get_wol,

  	.set_eee		= dsa_slave_set_eee,
  	.get_eee		= dsa_slave_get_eee,

  };

  static const struct net_device_ops dsa_slave_netdev_ops = {

  	.ndo_open	 	= dsa_slave_open,
  	.ndo_stop		= dsa_slave_close,

  	.ndo_start_xmit		= dsa_slave_xmit,

  	.ndo_change_rx_flags	= dsa_slave_change_rx_flags,
  	.ndo_set_rx_mode	= dsa_slave_set_rx_mode,

  	.ndo_set_mac_address	= dsa_slave_set_mac_address,

  	.ndo_fdb_add		= switchdev_port_fdb_add,
  	.ndo_fdb_del		= switchdev_port_fdb_del,
  	.ndo_fdb_dump		= switchdev_port_fdb_dump,

  	.ndo_do_ioctl		= dsa_slave_ioctl,

  	.ndo_get_iflink		= dsa_slave_get_iflink,

  #ifdef CONFIG_NET_POLL_CONTROLLER
  	.ndo_netpoll_setup	= dsa_slave_netpoll_setup,
  	.ndo_netpoll_cleanup	= dsa_slave_netpoll_cleanup,
  	.ndo_poll_controller	= dsa_slave_poll_controller,
  #endif

  	.ndo_bridge_getlink	= switchdev_port_bridge_getlink,
  	.ndo_bridge_setlink	= switchdev_port_bridge_setlink,
  	.ndo_bridge_dellink	= switchdev_port_bridge_dellink,

  };

  static const struct switchdev_ops dsa_slave_switchdev_ops = {

  	.switchdev_port_attr_get	= dsa_slave_port_attr_get,

  	.switchdev_port_attr_set	= dsa_slave_port_attr_set,

  	.switchdev_port_obj_add		= dsa_slave_port_obj_add,
  	.switchdev_port_obj_del		= dsa_slave_port_obj_del,
  	.switchdev_port_obj_dump	= dsa_slave_port_obj_dump,

  };

  static struct device_type dsa_type = {
  	.name	= "dsa",
  };

  static void dsa_slave_adjust_link(struct net_device *dev)
  {
  	struct dsa_slave_priv *p = netdev_priv(dev);

  	struct dsa_switch *ds = p->parent;

  	unsigned int status_changed = 0;
  
  	if (p->old_link != p->phy->link) {
  		status_changed = 1;
  		p->old_link = p->phy->link;
  	}
  
  	if (p->old_duplex != p->phy->duplex) {
  		status_changed = 1;
  		p->old_duplex = p->phy->duplex;
  	}
  
  	if (p->old_pause != p->phy->pause) {
  		status_changed = 1;
  		p->old_pause = p->phy->pause;
  	}

  	if (ds->ops->adjust_link && status_changed)
  		ds->ops->adjust_link(ds, p->port, p->phy);

  	if (status_changed)
  		phy_print_status(p->phy);
  }

  static int dsa_slave_fixed_link_update(struct net_device *dev,
  				       struct fixed_phy_status *status)
  {

  	struct dsa_slave_priv *p;
  	struct dsa_switch *ds;
  
  	if (dev) {
  		p = netdev_priv(dev);
  		ds = p->parent;

  		if (ds->ops->fixed_link_update)
  			ds->ops->fixed_link_update(ds, p->port, status);

  	}

  
  	return 0;
  }

  /* slave device setup *******************************************************/

  static int dsa_slave_phy_connect(struct dsa_slave_priv *p,

  				 struct net_device *slave_dev,
  				 int addr)

  {
  	struct dsa_switch *ds = p->parent;

  	p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);

  	if (!p->phy) {
  		netdev_err(slave_dev, "no phy at %d
  ", addr);

  		return -ENODEV;

  	}

  
  	/* Use already configured phy mode */

  	if (p->phy_interface == PHY_INTERFACE_MODE_NA)
  		p->phy_interface = p->phy->interface;

  	phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
  			   p->phy_interface);
  
  	return 0;
  }

  static int dsa_slave_phy_setup(struct dsa_slave_priv *p,

  				struct net_device *slave_dev)
  {
  	struct dsa_switch *ds = p->parent;

  	struct device_node *phy_dn, *port_dn;

  	bool phy_is_fixed = false;

  	u32 phy_flags = 0;

  	int mode, ret;

  	port_dn = ds->ports[p->port].dn;

  	mode = of_get_phy_mode(port_dn);
  	if (mode < 0)
  		mode = PHY_INTERFACE_MODE_NA;
  	p->phy_interface = mode;

  
  	phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);

  	if (!phy_dn && of_phy_is_fixed_link(port_dn)) {

  		/* In the case of a fixed PHY, the DT node associated
  		 * to the fixed PHY is the Port DT node
  		 */
  		ret = of_phy_register_fixed_link(port_dn);
  		if (ret) {

  			netdev_err(slave_dev, "failed to register fixed PHY: %d
  ", ret);

  			return ret;

  		}

  		phy_is_fixed = true;

  		phy_dn = of_node_get(port_dn);

  	}

  	if (ds->ops->get_phy_flags)
  		phy_flags = ds->ops->get_phy_flags(ds, p->port);

  	if (phy_dn) {

  		int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);

  		/* If this PHY address is part of phys_mii_mask, which means
  		 * that we need to divert reads and writes to/from it, then we
  		 * want to bind this device using the slave MII bus created by
  		 * DSA to make that happen.
  		 */

  		if (!phy_is_fixed && phy_id >= 0 &&
  		    (ds->phys_mii_mask & (1 << phy_id))) {
  			ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
  			if (ret) {
  				netdev_err(slave_dev, "failed to connect to phy%d: %d
  ", phy_id, ret);

  				of_node_put(phy_dn);

  				return ret;

  			}

  		} else {
  			p->phy = of_phy_connect(slave_dev, phy_dn,
  						dsa_slave_adjust_link,
  						phy_flags,
  						p->phy_interface);
  		}

  
  		of_node_put(phy_dn);

  	}

  	if (p->phy && phy_is_fixed)
  		fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);

  	/* We could not connect to a designated PHY, so use the switch internal
  	 * MDIO bus instead
  	 */

  	if (!p->phy) {

  		ret = dsa_slave_phy_connect(p, slave_dev, p->port);

  		if (ret) {
  			netdev_err(slave_dev, "failed to connect to port %d: %d
  ", p->port, ret);

  			if (phy_is_fixed)
  				of_phy_deregister_fixed_link(port_dn);

  			return ret;

  		}

  	}

  	phy_attached_info(p->phy);

  	return 0;

  }

  static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
  static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
  					    struct netdev_queue *txq,
  					    void *_unused)
  {
  	lockdep_set_class(&txq->_xmit_lock,
  			  &dsa_slave_netdev_xmit_lock_key);
  }

  int dsa_slave_suspend(struct net_device *slave_dev)
  {
  	struct dsa_slave_priv *p = netdev_priv(slave_dev);

  	netif_device_detach(slave_dev);

  	if (p->phy) {
  		phy_stop(p->phy);
  		p->old_pause = -1;
  		p->old_link = -1;
  		p->old_duplex = -1;
  		phy_suspend(p->phy);
  	}
  
  	return 0;
  }
  
  int dsa_slave_resume(struct net_device *slave_dev)
  {
  	struct dsa_slave_priv *p = netdev_priv(slave_dev);
  
  	netif_device_attach(slave_dev);
  
  	if (p->phy) {
  		phy_resume(p->phy);
  		phy_start(p->phy);
  	}
  
  	return 0;
  }

  int dsa_slave_create(struct dsa_switch *ds, struct device *parent,

  		     int port, const char *name)

  {

  	struct dsa_switch_tree *dst = ds->dst;

  	struct net_device *master;

  	struct net_device *slave_dev;
  	struct dsa_slave_priv *p;
  	int ret;

  	master = ds->dst->master_netdev;
  	if (ds->master_netdev)
  		master = ds->master_netdev;

  	slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
  				 NET_NAME_UNKNOWN, ether_setup);

  	if (slave_dev == NULL)

  		return -ENOMEM;

  
  	slave_dev->features = master->vlan_features;

  	slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;

  	eth_hw_addr_inherit(slave_dev, master);

  	slave_dev->priv_flags |= IFF_NO_QUEUE;

  	slave_dev->netdev_ops = &dsa_slave_netdev_ops;

  	slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;

  	SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);

  	netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
  				 NULL);

  	SET_NETDEV_DEV(slave_dev, parent);

  	slave_dev->dev.of_node = ds->ports[port].dn;

  	slave_dev->vlan_features = master->vlan_features;
  
  	p = netdev_priv(slave_dev);

  	p->parent = ds;
  	p->port = port;

  	p->xmit = dst->tag_ops->xmit;

  	p->old_pause = -1;
  	p->old_link = -1;
  	p->old_duplex = -1;

  	ds->ports[port].netdev = slave_dev;

  	ret = register_netdev(slave_dev);
  	if (ret) {

  		netdev_err(master, "error %d registering interface %s
  ",
  			   ret, slave_dev->name);

  		ds->ports[port].netdev = NULL;

  		free_netdev(slave_dev);

  		return ret;

  	}
  
  	netif_carrier_off(slave_dev);

  	ret = dsa_slave_phy_setup(p, slave_dev);
  	if (ret) {
  		netdev_err(master, "error %d setting up slave phy
  ", ret);

  		unregister_netdev(slave_dev);

  		free_netdev(slave_dev);
  		return ret;
  	}

  	return 0;

  }

  void dsa_slave_destroy(struct net_device *slave_dev)
  {
  	struct dsa_slave_priv *p = netdev_priv(slave_dev);

  	struct dsa_switch *ds = p->parent;
  	struct device_node *port_dn;
  
  	port_dn = ds->ports[p->port].dn;

  
  	netif_carrier_off(slave_dev);

  	if (p->phy) {

  		phy_disconnect(p->phy);

  
  		if (of_phy_is_fixed_link(port_dn))
  			of_phy_deregister_fixed_link(port_dn);
  	}

  	unregister_netdev(slave_dev);
  	free_netdev(slave_dev);
  }

  static bool dsa_slave_dev_check(struct net_device *dev)
  {
  	return dev->netdev_ops == &dsa_slave_netdev_ops;
  }

  static int dsa_slave_port_upper_event(struct net_device *dev,
  				      unsigned long event, void *ptr)

  {

  	struct netdev_notifier_changeupper_info *info = ptr;
  	struct net_device *upper = info->upper_dev;

  	int err = 0;

  	switch (event) {
  	case NETDEV_CHANGEUPPER:
  		if (netif_is_bridge_master(upper)) {
  			if (info->linking)
  				err = dsa_slave_bridge_port_join(dev, upper);
  			else
  				dsa_slave_bridge_port_leave(dev);
  		}

  		break;
  	}
  
  	return notifier_from_errno(err);

  }

  static int dsa_slave_port_event(struct net_device *dev, unsigned long event,
  				void *ptr)

  {

  	switch (event) {
  	case NETDEV_CHANGEUPPER:

  		return dsa_slave_port_upper_event(dev, event, ptr);
  	}

  	return NOTIFY_DONE;
  }

  int dsa_slave_netdevice_event(struct notifier_block *unused,
  			      unsigned long event, void *ptr)
  {
  	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
  
  	if (dsa_slave_dev_check(dev))
  		return dsa_slave_port_event(dev, event, ptr);

  	return NOTIFY_DONE;
  }