/*
   * drivers/net/team/team.c - Network team device driver
   * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
   *
   * 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/kernel.h>
  #include <linux/types.h>
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/rcupdate.h>
  #include <linux/errno.h>
  #include <linux/ctype.h>
  #include <linux/notifier.h>
  #include <linux/netdevice.h>
  #include <linux/netpoll.h>
  #include <linux/if_vlan.h>
  #include <linux/if_arp.h>
  #include <linux/socket.h>
  #include <linux/etherdevice.h>
  #include <linux/rtnetlink.h>
  #include <net/rtnetlink.h>
  #include <net/genetlink.h>
  #include <net/netlink.h>
  #include <net/sch_generic.h>
  #include <net/switchdev.h>
  #include <generated/utsrelease.h>
  #include <linux/if_team.h>
  
  #define DRV_NAME "team"
  
  
  /**********
   * Helpers
   **********/
  
  #define team_port_exists(dev) (dev->priv_flags & IFF_TEAM_PORT)
  
  static struct team_port *team_port_get_rcu(const struct net_device *dev)
  {
  	return rcu_dereference(dev->rx_handler_data);
  }
  
  static struct team_port *team_port_get_rtnl(const struct net_device *dev)
  {
  	struct team_port *port = rtnl_dereference(dev->rx_handler_data);
  
  	return team_port_exists(dev) ? port : NULL;
  }
  
  /*
   * Since the ability to change device address for open port device is tested in
   * team_port_add, this function can be called without control of return value
   */
  static int __set_port_dev_addr(struct net_device *port_dev,
  			       const unsigned char *dev_addr)
  {
  	struct sockaddr addr;
  
  	memcpy(addr.sa_data, dev_addr, port_dev->addr_len);
  	addr.sa_family = port_dev->type;
  	return dev_set_mac_address(port_dev, &addr);
  }
  
  static int team_port_set_orig_dev_addr(struct team_port *port)
  {
  	return __set_port_dev_addr(port->dev, port->orig.dev_addr);
  }
  
  static int team_port_set_team_dev_addr(struct team *team,
  				       struct team_port *port)
  {
  	return __set_port_dev_addr(port->dev, team->dev->dev_addr);
  }
  
  int team_modeop_port_enter(struct team *team, struct team_port *port)
  {
  	return team_port_set_team_dev_addr(team, port);
  }
  EXPORT_SYMBOL(team_modeop_port_enter);
  
  void team_modeop_port_change_dev_addr(struct team *team,
  				      struct team_port *port)
  {
  	team_port_set_team_dev_addr(team, port);
  }
  EXPORT_SYMBOL(team_modeop_port_change_dev_addr);
  
  static void team_refresh_port_linkup(struct team_port *port)
  {
  	port->linkup = port->user.linkup_enabled ? port->user.linkup :
  						   port->state.linkup;
  }
  
  
  /*******************
   * Options handling
   *******************/
  
  struct team_option_inst { /* One for each option instance */
  	struct list_head list;
  	struct list_head tmp_list;
  	struct team_option *option;
  	struct team_option_inst_info info;
  	bool changed;
  	bool removed;
  };
  
  static struct team_option *__team_find_option(struct team *team,
  					      const char *opt_name)
  {
  	struct team_option *option;
  
  	list_for_each_entry(option, &team->option_list, list) {
  		if (strcmp(option->name, opt_name) == 0)
  			return option;
  	}
  	return NULL;
  }
  
  static void __team_option_inst_del(struct team_option_inst *opt_inst)
  {
  	list_del(&opt_inst->list);
  	kfree(opt_inst);
  }
  
  static void __team_option_inst_del_option(struct team *team,
  					  struct team_option *option)
  {
  	struct team_option_inst *opt_inst, *tmp;
  
  	list_for_each_entry_safe(opt_inst, tmp, &team->option_inst_list, list) {
  		if (opt_inst->option == option)
  			__team_option_inst_del(opt_inst);
  	}
  }
  
  static int __team_option_inst_add(struct team *team, struct team_option *option,
  				  struct team_port *port)
  {
  	struct team_option_inst *opt_inst;
  	unsigned int array_size;
  	unsigned int i;
  	int err;
  
  	array_size = option->array_size;
  	if (!array_size)
  		array_size = 1; /* No array but still need one instance */
  
  	for (i = 0; i < array_size; i++) {
  		opt_inst = kmalloc(sizeof(*opt_inst), GFP_KERNEL);
  		if (!opt_inst)
  			return -ENOMEM;
  		opt_inst->option = option;
  		opt_inst->info.port = port;
  		opt_inst->info.array_index = i;
  		opt_inst->changed = true;
  		opt_inst->removed = false;
  		list_add_tail(&opt_inst->list, &team->option_inst_list);
  		if (option->init) {
  			err = option->init(team, &opt_inst->info);
  			if (err)
  				return err;
  		}
  
  	}
  	return 0;
  }
  
  static int __team_option_inst_add_option(struct team *team,
  					 struct team_option *option)
  {
  	int err;
  
  	if (!option->per_port) {
  		err = __team_option_inst_add(team, option, NULL);
  		if (err)
  			goto inst_del_option;
  	}
  	return 0;
  
  inst_del_option:
  	__team_option_inst_del_option(team, option);
  	return err;
  }
  
  static void __team_option_inst_mark_removed_option(struct team *team,
  						   struct team_option *option)
  {
  	struct team_option_inst *opt_inst;
  
  	list_for_each_entry(opt_inst, &team->option_inst_list, list) {
  		if (opt_inst->option == option) {
  			opt_inst->changed = true;
  			opt_inst->removed = true;
  		}
  	}
  }
  
  static void __team_option_inst_del_port(struct team *team,
  					struct team_port *port)
  {
  	struct team_option_inst *opt_inst, *tmp;
  
  	list_for_each_entry_safe(opt_inst, tmp, &team->option_inst_list, list) {
  		if (opt_inst->option->per_port &&
  		    opt_inst->info.port == port)
  			__team_option_inst_del(opt_inst);
  	}
  }
  
  static int __team_option_inst_add_port(struct team *team,
  				       struct team_port *port)
  {
  	struct team_option *option;
  	int err;
  
  	list_for_each_entry(option, &team->option_list, list) {
  		if (!option->per_port)
  			continue;
  		err = __team_option_inst_add(team, option, port);
  		if (err)
  			goto inst_del_port;
  	}
  	return 0;
  
  inst_del_port:
  	__team_option_inst_del_port(team, port);
  	return err;
  }
  
  static void __team_option_inst_mark_removed_port(struct team *team,
  						 struct team_port *port)
  {
  	struct team_option_inst *opt_inst;
  
  	list_for_each_entry(opt_inst, &team->option_inst_list, list) {
  		if (opt_inst->info.port == port) {
  			opt_inst->changed = true;
  			opt_inst->removed = true;
  		}
  	}
  }
  
  static int __team_options_register(struct team *team,
  				   const struct team_option *option,
  				   size_t option_count)
  {
  	int i;
  	struct team_option **dst_opts;
  	int err;
  
  	dst_opts = kzalloc(sizeof(struct team_option *) * option_count,
  			   GFP_KERNEL);
  	if (!dst_opts)
  		return -ENOMEM;
  	for (i = 0; i < option_count; i++, option++) {
  		if (__team_find_option(team, option->name)) {
  			err = -EEXIST;
  			goto alloc_rollback;
  		}
  		dst_opts[i] = kmemdup(option, sizeof(*option), GFP_KERNEL);
  		if (!dst_opts[i]) {
  			err = -ENOMEM;
  			goto alloc_rollback;
  		}
  	}
  
  	for (i = 0; i < option_count; i++) {
  		err = __team_option_inst_add_option(team, dst_opts[i]);
  		if (err)
  			goto inst_rollback;
  		list_add_tail(&dst_opts[i]->list, &team->option_list);
  	}
  
  	kfree(dst_opts);
  	return 0;
  
  inst_rollback:
  	for (i--; i >= 0; i--)
  		__team_option_inst_del_option(team, dst_opts[i]);
  
  	i = option_count - 1;
  alloc_rollback:
  	for (i--; i >= 0; i--)
  		kfree(dst_opts[i]);
  
  	kfree(dst_opts);
  	return err;
  }
  
  static void __team_options_mark_removed(struct team *team,
  					const struct team_option *option,
  					size_t option_count)
  {
  	int i;
  
  	for (i = 0; i < option_count; i++, option++) {
  		struct team_option *del_opt;
  
  		del_opt = __team_find_option(team, option->name);
  		if (del_opt)
  			__team_option_inst_mark_removed_option(team, del_opt);
  	}
  }
  
  static void __team_options_unregister(struct team *team,
  				      const struct team_option *option,
  				      size_t option_count)
  {
  	int i;
  
  	for (i = 0; i < option_count; i++, option++) {
  		struct team_option *del_opt;
  
  		del_opt = __team_find_option(team, option->name);
  		if (del_opt) {
  			__team_option_inst_del_option(team, del_opt);
  			list_del(&del_opt->list);
  			kfree(del_opt);
  		}
  	}
  }
  
  static void __team_options_change_check(struct team *team);
  
  int team_options_register(struct team *team,
  			  const struct team_option *option,
  			  size_t option_count)
  {
  	int err;
  
  	err = __team_options_register(team, option, option_count);
  	if (err)
  		return err;
  	__team_options_change_check(team);
  	return 0;
  }
  EXPORT_SYMBOL(team_options_register);
  
  void team_options_unregister(struct team *team,
  			     const struct team_option *option,
  			     size_t option_count)
  {
  	__team_options_mark_removed(team, option, option_count);
  	__team_options_change_check(team);
  	__team_options_unregister(team, option, option_count);
  }
  EXPORT_SYMBOL(team_options_unregister);
  
  static int team_option_get(struct team *team,
  			   struct team_option_inst *opt_inst,
  			   struct team_gsetter_ctx *ctx)
  {
  	if (!opt_inst->option->getter)
  		return -EOPNOTSUPP;
  	return opt_inst->option->getter(team, ctx);
  }
  
  static int team_option_set(struct team *team,
  			   struct team_option_inst *opt_inst,
  			   struct team_gsetter_ctx *ctx)
  {
  	if (!opt_inst->option->setter)
  		return -EOPNOTSUPP;
  	return opt_inst->option->setter(team, ctx);
  }
  
  void team_option_inst_set_change(struct team_option_inst_info *opt_inst_info)
  {
  	struct team_option_inst *opt_inst;
  
  	opt_inst = container_of(opt_inst_info, struct team_option_inst, info);
  	opt_inst->changed = true;
  }
  EXPORT_SYMBOL(team_option_inst_set_change);
  
  void team_options_change_check(struct team *team)
  {
  	__team_options_change_check(team);
  }
  EXPORT_SYMBOL(team_options_change_check);
  
  
  /****************
   * Mode handling
   ****************/
  
  static LIST_HEAD(mode_list);
  static DEFINE_SPINLOCK(mode_list_lock);
  
  struct team_mode_item {
  	struct list_head list;
  	const struct team_mode *mode;
  };
  
  static struct team_mode_item *__find_mode(const char *kind)
  {
  	struct team_mode_item *mitem;
  
  	list_for_each_entry(mitem, &mode_list, list) {
  		if (strcmp(mitem->mode->kind, kind) == 0)
  			return mitem;
  	}
  	return NULL;
  }
  
  static bool is_good_mode_name(const char *name)
  {
  	while (*name != '\0') {
  		if (!isalpha(*name) && !isdigit(*name) && *name != '_')
  			return false;
  		name++;
  	}
  	return true;
  }
  
  int team_mode_register(const struct team_mode *mode)
  {
  	int err = 0;
  	struct team_mode_item *mitem;
  
  	if (!is_good_mode_name(mode->kind) ||
  	    mode->priv_size > TEAM_MODE_PRIV_SIZE)
  		return -EINVAL;
  
  	mitem = kmalloc(sizeof(*mitem), GFP_KERNEL);
  	if (!mitem)
  		return -ENOMEM;
  
  	spin_lock(&mode_list_lock);
  	if (__find_mode(mode->kind)) {
  		err = -EEXIST;
  		kfree(mitem);
  		goto unlock;
  	}
  	mitem->mode = mode;
  	list_add_tail(&mitem->list, &mode_list);
  unlock:
  	spin_unlock(&mode_list_lock);
  	return err;
  }
  EXPORT_SYMBOL(team_mode_register);
  
  void team_mode_unregister(const struct team_mode *mode)
  {
  	struct team_mode_item *mitem;
  
  	spin_lock(&mode_list_lock);
  	mitem = __find_mode(mode->kind);
  	if (mitem) {
  		list_del_init(&mitem->list);
  		kfree(mitem);
  	}
  	spin_unlock(&mode_list_lock);
  }
  EXPORT_SYMBOL(team_mode_unregister);
  
  static const struct team_mode *team_mode_get(const char *kind)
  {
  	struct team_mode_item *mitem;
  	const struct team_mode *mode = NULL;
  
  	spin_lock(&mode_list_lock);
  	mitem = __find_mode(kind);
  	if (!mitem) {
  		spin_unlock(&mode_list_lock);
  		request_module("team-mode-%s", kind);
  		spin_lock(&mode_list_lock);
  		mitem = __find_mode(kind);
  	}
  	if (mitem) {
  		mode = mitem->mode;
  		if (!try_module_get(mode->owner))
  			mode = NULL;
  	}
  
  	spin_unlock(&mode_list_lock);
  	return mode;
  }
  
  static void team_mode_put(const struct team_mode *mode)
  {
  	module_put(mode->owner);
  }
  
  static bool team_dummy_transmit(struct team *team, struct sk_buff *skb)
  {
  	dev_kfree_skb_any(skb);
  	return false;
  }
  
  static rx_handler_result_t team_dummy_receive(struct team *team,
  					      struct team_port *port,
  					      struct sk_buff *skb)
  {
  	return RX_HANDLER_ANOTHER;
  }
  
  static const struct team_mode __team_no_mode = {
  	.kind		= "*NOMODE*",
  };
  
  static bool team_is_mode_set(struct team *team)
  {
  	return team->mode != &__team_no_mode;
  }
  
  static void team_set_no_mode(struct team *team)
  {
  	team->user_carrier_enabled = false;
  	team->mode = &__team_no_mode;
  }
  
  static void team_adjust_ops(struct team *team)
  {
  	/*
  	 * To avoid checks in rx/tx skb paths, ensure here that non-null and
  	 * correct ops are always set.
  	 */
  
  	if (!team->en_port_count || !team_is_mode_set(team) ||
  	    !team->mode->ops->transmit)
  		team->ops.transmit = team_dummy_transmit;
  	else
  		team->ops.transmit = team->mode->ops->transmit;
  
  	if (!team->en_port_count || !team_is_mode_set(team) ||
  	    !team->mode->ops->receive)
  		team->ops.receive = team_dummy_receive;
  	else
  		team->ops.receive = team->mode->ops->receive;
  }
  
  /*
   * We can benefit from the fact that it's ensured no port is present
   * at the time of mode change. Therefore no packets are in fly so there's no
   * need to set mode operations in any special way.
   */
  static int __team_change_mode(struct team *team,
  			      const struct team_mode *new_mode)
  {
  	/* Check if mode was previously set and do cleanup if so */
  	if (team_is_mode_set(team)) {
  		void (*exit_op)(struct team *team) = team->ops.exit;
  
  		/* Clear ops area so no callback is called any longer */
  		memset(&team->ops, 0, sizeof(struct team_mode_ops));
  		team_adjust_ops(team);
  
  		if (exit_op)
  			exit_op(team);
  		team_mode_put(team->mode);
  		team_set_no_mode(team);
  		/* zero private data area */
  		memset(&team->mode_priv, 0,
  		       sizeof(struct team) - offsetof(struct team, mode_priv));
  	}
  
  	if (!new_mode)
  		return 0;
  
  	if (new_mode->ops->init) {
  		int err;
  
  		err = new_mode->ops->init(team);
  		if (err)
  			return err;
  	}
  
  	team->mode = new_mode;
  	memcpy(&team->ops, new_mode->ops, sizeof(struct team_mode_ops));
  	team_adjust_ops(team);
  
  	return 0;
  }
  
  static int team_change_mode(struct team *team, const char *kind)
  {
  	const struct team_mode *new_mode;
  	struct net_device *dev = team->dev;
  	int err;
  
  	if (!list_empty(&team->port_list)) {
  		netdev_err(dev, "No ports can be present during mode change
  ");
  		return -EBUSY;
  	}
  
  	if (team_is_mode_set(team) && strcmp(team->mode->kind, kind) == 0) {
  		netdev_err(dev, "Unable to change to the same mode the team is in
  ");
  		return -EINVAL;
  	}
  
  	new_mode = team_mode_get(kind);
  	if (!new_mode) {
  		netdev_err(dev, "Mode \"%s\" not found
  ", kind);
  		return -EINVAL;
  	}
  
  	err = __team_change_mode(team, new_mode);
  	if (err) {
  		netdev_err(dev, "Failed to change to mode \"%s\"
  ", kind);
  		team_mode_put(new_mode);
  		return err;
  	}
  
  	netdev_info(dev, "Mode changed to \"%s\"
  ", kind);
  	return 0;
  }
  
  
  /*********************
   * Peers notification
   *********************/
  
  static void team_notify_peers_work(struct work_struct *work)
  {
  	struct team *team;
  	int val;
  
  	team = container_of(work, struct team, notify_peers.dw.work);
  
  	if (!rtnl_trylock()) {
  		schedule_delayed_work(&team->notify_peers.dw, 0);
  		return;
  	}
  	val = atomic_dec_if_positive(&team->notify_peers.count_pending);
  	if (val < 0) {
  		rtnl_unlock();
  		return;
  	}
  	call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, team->dev);
  	rtnl_unlock();
  	if (val)
  		schedule_delayed_work(&team->notify_peers.dw,
  				      msecs_to_jiffies(team->notify_peers.interval));
  }
  
  static void team_notify_peers(struct team *team)
  {
  	if (!team->notify_peers.count || !netif_running(team->dev))
  		return;
  	atomic_add(team->notify_peers.count, &team->notify_peers.count_pending);
  	schedule_delayed_work(&team->notify_peers.dw, 0);
  }
  
  static void team_notify_peers_init(struct team *team)
  {
  	INIT_DELAYED_WORK(&team->notify_peers.dw, team_notify_peers_work);
  }
  
  static void team_notify_peers_fini(struct team *team)
  {
  	cancel_delayed_work_sync(&team->notify_peers.dw);
  }
  
  
  /*******************************
   * Send multicast group rejoins
   *******************************/
  
  static void team_mcast_rejoin_work(struct work_struct *work)
  {
  	struct team *team;
  	int val;
  
  	team = container_of(work, struct team, mcast_rejoin.dw.work);
  
  	if (!rtnl_trylock()) {
  		schedule_delayed_work(&team->mcast_rejoin.dw, 0);
  		return;
  	}
  	val = atomic_dec_if_positive(&team->mcast_rejoin.count_pending);
  	if (val < 0) {
  		rtnl_unlock();
  		return;
  	}
  	call_netdevice_notifiers(NETDEV_RESEND_IGMP, team->dev);
  	rtnl_unlock();
  	if (val)
  		schedule_delayed_work(&team->mcast_rejoin.dw,
  				      msecs_to_jiffies(team->mcast_rejoin.interval));
  }
  
  static void team_mcast_rejoin(struct team *team)
  {
  	if (!team->mcast_rejoin.count || !netif_running(team->dev))
  		return;
  	atomic_add(team->mcast_rejoin.count, &team->mcast_rejoin.count_pending);
  	schedule_delayed_work(&team->mcast_rejoin.dw, 0);
  }
  
  static void team_mcast_rejoin_init(struct team *team)
  {
  	INIT_DELAYED_WORK(&team->mcast_rejoin.dw, team_mcast_rejoin_work);
  }
  
  static void team_mcast_rejoin_fini(struct team *team)
  {
  	cancel_delayed_work_sync(&team->mcast_rejoin.dw);
  }
  
  
  /************************
   * Rx path frame handler
   ************************/
  
  /* note: already called with rcu_read_lock */
  static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
  {
  	struct sk_buff *skb = *pskb;
  	struct team_port *port;
  	struct team *team;
  	rx_handler_result_t res;
  
  	skb = skb_share_check(skb, GFP_ATOMIC);
  	if (!skb)
  		return RX_HANDLER_CONSUMED;
  
  	*pskb = skb;
  
  	port = team_port_get_rcu(skb->dev);
  	team = port->team;
  	if (!team_port_enabled(port)) {
  		/* allow exact match delivery for disabled ports */
  		res = RX_HANDLER_EXACT;
  	} else {
  		res = team->ops.receive(team, port, skb);
  	}
  	if (res == RX_HANDLER_ANOTHER) {
  		struct team_pcpu_stats *pcpu_stats;
  
  		pcpu_stats = this_cpu_ptr(team->pcpu_stats);
  		u64_stats_update_begin(&pcpu_stats->syncp);
  		pcpu_stats->rx_packets++;
  		pcpu_stats->rx_bytes += skb->len;
  		if (skb->pkt_type == PACKET_MULTICAST)
  			pcpu_stats->rx_multicast++;
  		u64_stats_update_end(&pcpu_stats->syncp);
  
  		skb->dev = team->dev;
  	} else {
  		this_cpu_inc(team->pcpu_stats->rx_dropped);
  	}
  
  	return res;
  }
  
  
  /*************************************
   * Multiqueue Tx port select override
   *************************************/
  
  static int team_queue_override_init(struct team *team)
  {
  	struct list_head *listarr;
  	unsigned int queue_cnt = team->dev->num_tx_queues - 1;
  	unsigned int i;
  
  	if (!queue_cnt)
  		return 0;
  	listarr = kmalloc(sizeof(struct list_head) * queue_cnt, GFP_KERNEL);
  	if (!listarr)
  		return -ENOMEM;
  	team->qom_lists = listarr;
  	for (i = 0; i < queue_cnt; i++)
  		INIT_LIST_HEAD(listarr++);
  	return 0;
  }
  
  static void team_queue_override_fini(struct team *team)
  {
  	kfree(team->qom_lists);
  }
  
  static struct list_head *__team_get_qom_list(struct team *team, u16 queue_id)
  {
  	return &team->qom_lists[queue_id - 1];
  }
  
  /*
   * note: already called with rcu_read_lock
   */
  static bool team_queue_override_transmit(struct team *team, struct sk_buff *skb)
  {
  	struct list_head *qom_list;
  	struct team_port *port;
  
  	if (!team->queue_override_enabled || !skb->queue_mapping)
  		return false;
  	qom_list = __team_get_qom_list(team, skb->queue_mapping);
  	list_for_each_entry_rcu(port, qom_list, qom_list) {
  		if (!team_dev_queue_xmit(team, port, skb))
  			return true;
  	}
  	return false;
  }
  
  static void __team_queue_override_port_del(struct team *team,
  					   struct team_port *port)
  {
  	if (!port->queue_id)
  		return;
  	list_del_rcu(&port->qom_list);
  }
  
  static bool team_queue_override_port_has_gt_prio_than(struct team_port *port,
  						      struct team_port *cur)
  {
  	if (port->priority < cur->priority)
  		return true;
  	if (port->priority > cur->priority)
  		return false;
  	if (port->index < cur->index)
  		return true;
  	return false;
  }
  
  static void __team_queue_override_port_add(struct team *team,
  					   struct team_port *port)
  {
  	struct team_port *cur;
  	struct list_head *qom_list;
  	struct list_head *node;
  
  	if (!port->queue_id)
  		return;
  	qom_list = __team_get_qom_list(team, port->queue_id);
  	node = qom_list;
  	list_for_each_entry(cur, qom_list, qom_list) {
  		if (team_queue_override_port_has_gt_prio_than(port, cur))
  			break;
  		node = &cur->qom_list;
  	}
  	list_add_tail_rcu(&port->qom_list, node);
  }
  
  static void __team_queue_override_enabled_check(struct team *team)
  {
  	struct team_port *port;
  	bool enabled = false;
  
  	list_for_each_entry(port, &team->port_list, list) {
  		if (port->queue_id) {
  			enabled = true;
  			break;
  		}
  	}
  	if (enabled == team->queue_override_enabled)
  		return;
  	netdev_dbg(team->dev, "%s queue override
  ",
  		   enabled ? "Enabling" : "Disabling");
  	team->queue_override_enabled = enabled;
  }
  
  static void team_queue_override_port_prio_changed(struct team *team,
  						  struct team_port *port)
  {
  	if (!port->queue_id || team_port_enabled(port))
  		return;
  	__team_queue_override_port_del(team, port);
  	__team_queue_override_port_add(team, port);
  	__team_queue_override_enabled_check(team);
  }
  
  static void team_queue_override_port_change_queue_id(struct team *team,
  						     struct team_port *port,
  						     u16 new_queue_id)
  {
  	if (team_port_enabled(port)) {
  		__team_queue_override_port_del(team, port);
  		port->queue_id = new_queue_id;
  		__team_queue_override_port_add(team, port);
  		__team_queue_override_enabled_check(team);
  	} else {
  		port->queue_id = new_queue_id;
  	}
  }
  
  static void team_queue_override_port_add(struct team *team,
  					 struct team_port *port)
  {
  	__team_queue_override_port_add(team, port);
  	__team_queue_override_enabled_check(team);
  }
  
  static void team_queue_override_port_del(struct team *team,
  					 struct team_port *port)
  {
  	__team_queue_override_port_del(team, port);
  	__team_queue_override_enabled_check(team);
  }
  
  
  /****************
   * Port handling
   ****************/
  
  static bool team_port_find(const struct team *team,
  			   const struct team_port *port)
  {
  	struct team_port *cur;
  
  	list_for_each_entry(cur, &team->port_list, list)
  		if (cur == port)
  			return true;
  	return false;
  }
  
  /*
   * Enable/disable port by adding to enabled port hashlist and setting
   * port->index (Might be racy so reader could see incorrect ifindex when
   * processing a flying packet, but that is not a problem). Write guarded
   * by team->lock.
   */
  static void team_port_enable(struct team *team,
  			     struct team_port *port)
  {
  	if (team_port_enabled(port))
  		return;
  	port->index = team->en_port_count++;
  	hlist_add_head_rcu(&port->hlist,
  			   team_port_index_hash(team, port->index));
  	team_adjust_ops(team);
  	team_queue_override_port_add(team, port);
  	if (team->ops.port_enabled)
  		team->ops.port_enabled(team, port);
  	team_notify_peers(team);
  	team_mcast_rejoin(team);
  }
  
  static void __reconstruct_port_hlist(struct team *team, int rm_index)
  {
  	int i;
  	struct team_port *port;
  
  	for (i = rm_index + 1; i < team->en_port_count; i++) {
  		port = team_get_port_by_index(team, i);
  		hlist_del_rcu(&port->hlist);
  		port->index--;
  		hlist_add_head_rcu(&port->hlist,
  				   team_port_index_hash(team, port->index));
  	}
  }
  
  static void team_port_disable(struct team *team,
  			      struct team_port *port)
  {
  	if (!team_port_enabled(port))
  		return;
  	if (team->ops.port_disabled)
  		team->ops.port_disabled(team, port);
  	hlist_del_rcu(&port->hlist);
  	__reconstruct_port_hlist(team, port->index);
  	port->index = -1;
  	team->en_port_count--;
  	team_queue_override_port_del(team, port);
  	team_adjust_ops(team);
  	team_notify_peers(team);
  	team_mcast_rejoin(team);
  }
  
  #define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
  			    NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
  			    NETIF_F_HIGHDMA | NETIF_F_LRO)
  
  static void ___team_compute_features(struct team *team)
  {
  	struct team_port *port;
  	u32 vlan_features = TEAM_VLAN_FEATURES & NETIF_F_ALL_FOR_ALL;
  	unsigned short max_hard_header_len = ETH_HLEN;
  	unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
  					IFF_XMIT_DST_RELEASE_PERM;
  
  	list_for_each_entry(port, &team->port_list, list) {
  		vlan_features = netdev_increment_features(vlan_features,
  					port->dev->vlan_features,
  					TEAM_VLAN_FEATURES);
  
  		dst_release_flag &= port->dev->priv_flags;
  		if (port->dev->hard_header_len > max_hard_header_len)
  			max_hard_header_len = port->dev->hard_header_len;
  	}
  
  	team->dev->vlan_features = vlan_features;
  	team->dev->hard_header_len = max_hard_header_len;
  
  	team->dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
  	if (dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
  		team->dev->priv_flags |= IFF_XMIT_DST_RELEASE;
  }
  
  static void __team_compute_features(struct team *team)
  {
  	___team_compute_features(team);
  	netdev_change_features(team->dev);
  }
  
  static void team_compute_features(struct team *team)
  {
  	mutex_lock(&team->lock);
  	___team_compute_features(team);
  	mutex_unlock(&team->lock);
  	netdev_change_features(team->dev);
  }
  
  static int team_port_enter(struct team *team, struct team_port *port)
  {
  	int err = 0;
  
  	dev_hold(team->dev);
  	if (team->ops.port_enter) {
  		err = team->ops.port_enter(team, port);
  		if (err) {
  			netdev_err(team->dev, "Device %s failed to enter team mode
  ",
  				   port->dev->name);
  			goto err_port_enter;
  		}
  	}
  
  	return 0;
  
  err_port_enter:
  	dev_put(team->dev);
  
  	return err;
  }
  
  static void team_port_leave(struct team *team, struct team_port *port)
  {
  	if (team->ops.port_leave)
  		team->ops.port_leave(team, port);
  	dev_put(team->dev);
  }
  
  #ifdef CONFIG_NET_POLL_CONTROLLER
  static int team_port_enable_netpoll(struct team *team, struct team_port *port)
  {
  	struct netpoll *np;
  	int err;
  
  	if (!team->dev->npinfo)
  		return 0;
  
  	np = kzalloc(sizeof(*np), GFP_KERNEL);
  	if (!np)
  		return -ENOMEM;
  
  	err = __netpoll_setup(np, port->dev);
  	if (err) {
  		kfree(np);
  		return err;
  	}
  	port->np = np;
  	return err;
  }
  
  static void team_port_disable_netpoll(struct team_port *port)
  {
  	struct netpoll *np = port->np;
  
  	if (!np)
  		return;
  	port->np = NULL;
  
  	/* Wait for transmitting packets to finish before freeing. */
  	synchronize_rcu_bh();
  	__netpoll_cleanup(np);
  	kfree(np);
  }
  #else
  static int team_port_enable_netpoll(struct team *team, struct team_port *port)
  {
  	return 0;
  }
  static void team_port_disable_netpoll(struct team_port *port)
  {
  }
  #endif
  
  static int team_upper_dev_link(struct net_device *dev,
  			       struct net_device *port_dev)
  {
  	int err;
  
  	err = netdev_master_upper_dev_link(port_dev, dev);
  	if (err)
  		return err;
  	port_dev->priv_flags |= IFF_TEAM_PORT;
  	return 0;
  }
  
  static void team_upper_dev_unlink(struct net_device *dev,
  				  struct net_device *port_dev)
  {
  	netdev_upper_dev_unlink(port_dev, dev);
  	port_dev->priv_flags &= ~IFF_TEAM_PORT;
  }
  
  static void __team_port_change_port_added(struct team_port *port, bool linkup);
  static int team_dev_type_check_change(struct net_device *dev,
  				      struct net_device *port_dev);
  
  static int team_port_add(struct team *team, struct net_device *port_dev)
  {
  	struct net_device *dev = team->dev;
  	struct team_port *port;
  	char *portname = port_dev->name;
  	int err;
  
  	if (port_dev->flags & IFF_LOOPBACK) {
  		netdev_err(dev, "Device %s is loopback device. Loopback devices can't be added as a team port
  ",
  			   portname);
  		return -EINVAL;
  	}
  
  	if (team_port_exists(port_dev)) {
  		netdev_err(dev, "Device %s is already a port "
  				"of a team device
  ", portname);
  		return -EBUSY;
  	}
  
  	if (port_dev->features & NETIF_F_VLAN_CHALLENGED &&
  	    vlan_uses_dev(dev)) {
  		netdev_err(dev, "Device %s is VLAN challenged and team device has VLAN set up
  ",
  			   portname);
  		return -EPERM;
  	}
  
  	err = team_dev_type_check_change(dev, port_dev);
  	if (err)
  		return err;
  
  	if (port_dev->flags & IFF_UP) {
  		netdev_err(dev, "Device %s is up. Set it down before adding it as a team port
  ",
  			   portname);
  		return -EBUSY;
  	}
  
  	port = kzalloc(sizeof(struct team_port) + team->mode->port_priv_size,
  		       GFP_KERNEL);
  	if (!port)
  		return -ENOMEM;
  
  	port->dev = port_dev;
  	port->team = team;
  	INIT_LIST_HEAD(&port->qom_list);
  
  	port->orig.mtu = port_dev->mtu;
  	err = dev_set_mtu(port_dev, dev->mtu);
  	if (err) {
  		netdev_dbg(dev, "Error %d calling dev_set_mtu
  ", err);
  		goto err_set_mtu;
  	}
  
  	memcpy(port->orig.dev_addr, port_dev->dev_addr, port_dev->addr_len);
  
  	err = team_port_enter(team, port);
  	if (err) {
  		netdev_err(dev, "Device %s failed to enter team mode
  ",
  			   portname);
  		goto err_port_enter;
  	}
  
  	err = dev_open(port_dev);
  	if (err) {
  		netdev_dbg(dev, "Device %s opening failed
  ",
  			   portname);
  		goto err_dev_open;
  	}
  
  	err = vlan_vids_add_by_dev(port_dev, dev);
  	if (err) {
  		netdev_err(dev, "Failed to add vlan ids to device %s
  ",
  				portname);
  		goto err_vids_add;
  	}
  
  	err = team_port_enable_netpoll(team, port);
  	if (err) {
  		netdev_err(dev, "Failed to enable netpoll on device %s
  ",
  			   portname);
  		goto err_enable_netpoll;
  	}
  
  	if (!(dev->features & NETIF_F_LRO))
  		dev_disable_lro(port_dev);
  
  	err = netdev_rx_handler_register(port_dev, team_handle_frame,
  					 port);
  	if (err) {
  		netdev_err(dev, "Device %s failed to register rx_handler
  ",
  			   portname);
  		goto err_handler_register;
  	}
  
  	err = team_upper_dev_link(dev, port_dev);
  	if (err) {
  		netdev_err(dev, "Device %s failed to set upper link
  ",
  			   portname);
  		goto err_set_upper_link;
  	}
  
  	err = __team_option_inst_add_port(team, port);
  	if (err) {
  		netdev_err(dev, "Device %s failed to add per-port options
  ",
  			   portname);
  		goto err_option_port_add;
  	}
  
  	port->index = -1;
  	list_add_tail_rcu(&port->list, &team->port_list);
  	team_port_enable(team, port);
  	__team_compute_features(team);
  	__team_port_change_port_added(port, !!netif_carrier_ok(port_dev));
  	__team_options_change_check(team);
  
  	netdev_info(dev, "Port device %s added
  ", portname);
  
  	return 0;
  
  err_option_port_add:
  	team_upper_dev_unlink(dev, port_dev);
  
  err_set_upper_link:
  	netdev_rx_handler_unregister(port_dev);
  
  err_handler_register:
  	team_port_disable_netpoll(port);
  
  err_enable_netpoll:
  	vlan_vids_del_by_dev(port_dev, dev);
  
  err_vids_add:
  	dev_close(port_dev);
  
  err_dev_open:
  	team_port_leave(team, port);
  	team_port_set_orig_dev_addr(port);
  
  err_port_enter:
  	dev_set_mtu(port_dev, port->orig.mtu);
  
  err_set_mtu:
  	kfree(port);
  
  	return err;
  }
  
  static void __team_port_change_port_removed(struct team_port *port);
  
  static int team_port_del(struct team *team, struct net_device *port_dev)
  {
  	struct net_device *dev = team->dev;
  	struct team_port *port;
  	char *portname = port_dev->name;
  
  	port = team_port_get_rtnl(port_dev);
  	if (!port || !team_port_find(team, port)) {
  		netdev_err(dev, "Device %s does not act as a port of this team
  ",
  			   portname);
  		return -ENOENT;
  	}
  
  	team_port_disable(team, port);
  	list_del_rcu(&port->list);
  	team_upper_dev_unlink(dev, port_dev);
  	netdev_rx_handler_unregister(port_dev);
  	team_port_disable_netpoll(port);
  	vlan_vids_del_by_dev(port_dev, dev);
  	dev_uc_unsync(port_dev, dev);
  	dev_mc_unsync(port_dev, dev);
  	dev_close(port_dev);
  	team_port_leave(team, port);
  
  	__team_option_inst_mark_removed_port(team, port);
  	__team_options_change_check(team);
  	__team_option_inst_del_port(team, port);
  	__team_port_change_port_removed(port);
  
  	team_port_set_orig_dev_addr(port);
  	dev_set_mtu(port_dev, port->orig.mtu);
  	kfree_rcu(port, rcu);
  	netdev_info(dev, "Port device %s removed
  ", portname);
  	__team_compute_features(team);
  
  	return 0;
  }
  
  
  /*****************
   * Net device ops
   *****************/
  
  static int team_mode_option_get(struct team *team, struct team_gsetter_ctx *ctx)
  {
  	ctx->data.str_val = team->mode->kind;
  	return 0;
  }
  
  static int team_mode_option_set(struct team *team, struct team_gsetter_ctx *ctx)
  {
  	return team_change_mode(team, ctx->data.str_val);
  }
  
  static int team_notify_peers_count_get(struct team *team,
  				       struct team_gsetter_ctx *ctx)
  {
  	ctx->data.u32_val = team->notify_peers.count;
  	return 0;
  }
  
  static int team_notify_peers_count_set(struct team *team,
  				       struct team_gsetter_ctx *ctx)
  {
  	team->notify_peers.count = ctx->data.u32_val;
  	return 0;
  }
  
  static int team_notify_peers_interval_get(struct team *team,
  					  struct team_gsetter_ctx *ctx)
  {
  	ctx->data.u32_val = team->notify_peers.interval;
  	return 0;
  }
  
  static int team_notify_peers_interval_set(struct team *team,
  					  struct team_gsetter_ctx *ctx)
  {
  	team->notify_peers.interval = ctx->data.u32_val;
  	return 0;
  }
  
  static int team_mcast_rejoin_count_get(struct team *team,
  				       struct team_gsetter_ctx *ctx)
  {
  	ctx->data.u32_val = team->mcast_rejoin.count;
  	return 0;
  }
  
  static int team_mcast_rejoin_count_set(struct team *team,
  				       struct team_gsetter_ctx *ctx)
  {
  	team->mcast_rejoin.count = ctx->data.u32_val;
  	return 0;
  }
  
  static int team_mcast_rejoin_interval_get(struct team *team,
  					  struct team_gsetter_ctx *ctx)
  {
  	ctx->data.u32_val = team->mcast_rejoin.interval;
  	return 0;
  }
  
  static int team_mcast_rejoin_interval_set(struct team *team,
  					  struct team_gsetter_ctx *ctx)
  {
  	team->mcast_rejoin.interval = ctx->data.u32_val;
  	return 0;
  }
  
  static int team_port_en_option_get(struct team *team,
  				   struct team_gsetter_ctx *ctx)
  {
  	struct team_port *port = ctx->info->port;
  
  	ctx->data.bool_val = team_port_enabled(port);
  	return 0;
  }
  
  static int team_port_en_option_set(struct team *team,
  				   struct team_gsetter_ctx *ctx)
  {
  	struct team_port *port = ctx->info->port;
  
  	if (ctx->data.bool_val)
  		team_port_enable(team, port);
  	else
  		team_port_disable(team, port);
  	return 0;
  }
  
  static int team_user_linkup_option_get(struct team *team,
  				       struct team_gsetter_ctx *ctx)
  {
  	struct team_port *port = ctx->info->port;
  
  	ctx->data.bool_val = port->user.linkup;
  	return 0;
  }
  
  static void __team_carrier_check(struct team *team);
  
  static int team_user_linkup_option_set(struct team *team,
  				       struct team_gsetter_ctx *ctx)
  {
  	struct team_port *port = ctx->info->port;
  
  	port->user.linkup = ctx->data.bool_val;
  	team_refresh_port_linkup(port);
  	__team_carrier_check(port->team);
  	return 0;
  }
  
  static int team_user_linkup_en_option_get(struct team *team,
  					  struct team_gsetter_ctx *ctx)
  {
  	struct team_port *port = ctx->info->port;
  
  	ctx->data.bool_val = port->user.linkup_enabled;
  	return 0;
  }
  
  static int team_user_linkup_en_option_set(struct team *team,
  					  struct team_gsetter_ctx *ctx)
  {
  	struct team_port *port = ctx->info->port;
  
  	port->user.linkup_enabled = ctx->data.bool_val;
  	team_refresh_port_linkup(port);
  	__team_carrier_check(port->team);
  	return 0;
  }
  
  static int team_priority_option_get(struct team *team,
  				    struct team_gsetter_ctx *ctx)
  {
  	struct team_port *port = ctx->info->port;
  
  	ctx->data.s32_val = port->priority;
  	return 0;
  }
  
  static int team_priority_option_set(struct team *team,
  				    struct team_gsetter_ctx *ctx)
  {
  	struct team_port *port = ctx->info->port;
  	s32 priority = ctx->data.s32_val;
  
  	if (port->priority == priority)
  		return 0;
  	port->priority = priority;
  	team_queue_override_port_prio_changed(team, port);
  	return 0;
  }
  
  static int team_queue_id_option_get(struct team *team,
  				    struct team_gsetter_ctx *ctx)
  {
  	struct team_port *port = ctx->info->port;
  
  	ctx->data.u32_val = port->queue_id;
  	return 0;
  }
  
  static int team_queue_id_option_set(struct team *team,
  				    struct team_gsetter_ctx *ctx)
  {
  	struct team_port *port = ctx->info->port;
  	u16 new_queue_id = ctx->data.u32_val;
  
  	if (port->queue_id == new_queue_id)
  		return 0;
  	if (new_queue_id >= team->dev->real_num_tx_queues)
  		return -EINVAL;
  	team_queue_override_port_change_queue_id(team, port, new_queue_id);
  	return 0;
  }
  
  static const struct team_option team_options[] = {
  	{
  		.name = "mode",
  		.type = TEAM_OPTION_TYPE_STRING,
  		.getter = team_mode_option_get,
  		.setter = team_mode_option_set,
  	},
  	{
  		.name = "notify_peers_count",
  		.type = TEAM_OPTION_TYPE_U32,
  		.getter = team_notify_peers_count_get,
  		.setter = team_notify_peers_count_set,
  	},
  	{
  		.name = "notify_peers_interval",
  		.type = TEAM_OPTION_TYPE_U32,
  		.getter = team_notify_peers_interval_get,
  		.setter = team_notify_peers_interval_set,
  	},
  	{
  		.name = "mcast_rejoin_count",
  		.type = TEAM_OPTION_TYPE_U32,
  		.getter = team_mcast_rejoin_count_get,
  		.setter = team_mcast_rejoin_count_set,
  	},
  	{
  		.name = "mcast_rejoin_interval",
  		.type = TEAM_OPTION_TYPE_U32,
  		.getter = team_mcast_rejoin_interval_get,
  		.setter = team_mcast_rejoin_interval_set,
  	},
  	{
  		.name = "enabled",
  		.type = TEAM_OPTION_TYPE_BOOL,
  		.per_port = true,
  		.getter = team_port_en_option_get,
  		.setter = team_port_en_option_set,
  	},
  	{
  		.name = "user_linkup",
  		.type = TEAM_OPTION_TYPE_BOOL,
  		.per_port = true,
  		.getter = team_user_linkup_option_get,
  		.setter = team_user_linkup_option_set,
  	},
  	{
  		.name = "user_linkup_enabled",
  		.type = TEAM_OPTION_TYPE_BOOL,
  		.per_port = true,
  		.getter = team_user_linkup_en_option_get,
  		.setter = team_user_linkup_en_option_set,
  	},
  	{
  		.name = "priority",
  		.type = TEAM_OPTION_TYPE_S32,
  		.per_port = true,
  		.getter = team_priority_option_get,
  		.setter = team_priority_option_set,
  	},
  	{
  		.name = "queue_id",
  		.type = TEAM_OPTION_TYPE_U32,
  		.per_port = true,
  		.getter = team_queue_id_option_get,
  		.setter = team_queue_id_option_set,
  	},
  };
  
  static struct lock_class_key team_netdev_xmit_lock_key;
  static struct lock_class_key team_netdev_addr_lock_key;
  static struct lock_class_key team_tx_busylock_key;
  
  static void team_set_lockdep_class_one(struct net_device *dev,
  				       struct netdev_queue *txq,
  				       void *unused)
  {
  	lockdep_set_class(&txq->_xmit_lock, &team_netdev_xmit_lock_key);
  }
  
  static void team_set_lockdep_class(struct net_device *dev)
  {
  	lockdep_set_class(&dev->addr_list_lock, &team_netdev_addr_lock_key);
  	netdev_for_each_tx_queue(dev, team_set_lockdep_class_one, NULL);
  	dev->qdisc_tx_busylock = &team_tx_busylock_key;
  }
  
  static int team_init(struct net_device *dev)
  {
  	struct team *team = netdev_priv(dev);
  	int i;
  	int err;
  
  	team->dev = dev;
  	mutex_init(&team->lock);
  	team_set_no_mode(team);
  
  	team->pcpu_stats = netdev_alloc_pcpu_stats(struct team_pcpu_stats);
  	if (!team->pcpu_stats)
  		return -ENOMEM;
  
  	for (i = 0; i < TEAM_PORT_HASHENTRIES; i++)
  		INIT_HLIST_HEAD(&team->en_port_hlist[i]);
  	INIT_LIST_HEAD(&team->port_list);
  	err = team_queue_override_init(team);
  	if (err)
  		goto err_team_queue_override_init;
  
  	team_adjust_ops(team);
  
  	INIT_LIST_HEAD(&team->option_list);
  	INIT_LIST_HEAD(&team->option_inst_list);
  
  	team_notify_peers_init(team);
  	team_mcast_rejoin_init(team);
  
  	err = team_options_register(team, team_options, ARRAY_SIZE(team_options));
  	if (err)
  		goto err_options_register;
  	netif_carrier_off(dev);
  
  	team_set_lockdep_class(dev);
  
  	return 0;
  
  err_options_register:
  	team_mcast_rejoin_fini(team);
  	team_notify_peers_fini(team);
  	team_queue_override_fini(team);
  err_team_queue_override_init:
  	free_percpu(team->pcpu_stats);
  
  	return err;
  }
  
  static void team_uninit(struct net_device *dev)
  {
  	struct team *team = netdev_priv(dev);
  	struct team_port *port;
  	struct team_port *tmp;
  
  	mutex_lock(&team->lock);
  	list_for_each_entry_safe(port, tmp, &team->port_list, list)
  		team_port_del(team, port->dev);
  
  	__team_change_mode(team, NULL); /* cleanup */
  	__team_options_unregister(team, team_options, ARRAY_SIZE(team_options));
  	team_mcast_rejoin_fini(team);
  	team_notify_peers_fini(team);
  	team_queue_override_fini(team);
  	mutex_unlock(&team->lock);
  }
  
  static void team_destructor(struct net_device *dev)
  {
  	struct team *team = netdev_priv(dev);
  
  	free_percpu(team->pcpu_stats);
  	free_netdev(dev);
  }
  
  static int team_open(struct net_device *dev)
  {
  	return 0;
  }
  
  static int team_close(struct net_device *dev)
  {
  	return 0;
  }
  
  /*
   * note: already called with rcu_read_lock
   */
  static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev)
  {
  	struct team *team = netdev_priv(dev);
  	bool tx_success;
  	unsigned int len = skb->len;
  
  	tx_success = team_queue_override_transmit(team, skb);
  	if (!tx_success)
  		tx_success = team->ops.transmit(team, skb);
  	if (tx_success) {
  		struct team_pcpu_stats *pcpu_stats;
  
  		pcpu_stats = this_cpu_ptr(team->pcpu_stats);
  		u64_stats_update_begin(&pcpu_stats->syncp);
  		pcpu_stats->tx_packets++;
  		pcpu_stats->tx_bytes += len;
  		u64_stats_update_end(&pcpu_stats->syncp);
  	} else {
  		this_cpu_inc(team->pcpu_stats->tx_dropped);
  	}
  
  	return NETDEV_TX_OK;
  }
  
  static u16 team_select_queue(struct net_device *dev, struct sk_buff *skb,
  			     void *accel_priv, select_queue_fallback_t fallback)
  {
  	/*
  	 * This helper function exists to help dev_pick_tx get the correct
  	 * destination queue.  Using a helper function skips a call to
  	 * skb_tx_hash and will put the skbs in the queue we expect on their
  	 * way down to the team driver.
  	 */
  	u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
  
  	/*
  	 * Save the original txq to restore before passing to the driver
  	 */
  	qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
  
  	if (unlikely(txq >= dev->real_num_tx_queues)) {
  		do {
  			txq -= dev->real_num_tx_queues;
  		} while (txq >= dev->real_num_tx_queues);
  	}
  	return txq;
  }
  
  static void team_change_rx_flags(struct net_device *dev, int change)
  {
  	struct team *team = netdev_priv(dev);
  	struct team_port *port;
  	int inc;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(port, &team->port_list, list) {
  		if (change & IFF_PROMISC) {
  			inc = dev->flags & IFF_PROMISC ? 1 : -1;
  			dev_set_promiscuity(port->dev, inc);
  		}
  		if (change & IFF_ALLMULTI) {
  			inc = dev->flags & IFF_ALLMULTI ? 1 : -1;
  			dev_set_allmulti(port->dev, inc);
  		}
  	}
  	rcu_read_unlock();
  }
  
  static void team_set_rx_mode(struct net_device *dev)
  {
  	struct team *team = netdev_priv(dev);
  	struct team_port *port;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(port, &team->port_list, list) {
  		dev_uc_sync_multiple(port->dev, dev);
  		dev_mc_sync_multiple(port->dev, dev);
  	}
  	rcu_read_unlock();
  }
  
  static int team_set_mac_address(struct net_device *dev, void *p)
  {
  	struct sockaddr *addr = p;
  	struct team *team = netdev_priv(dev);
  	struct team_port *port;
  
  	if (dev->type == ARPHRD_ETHER && !is_valid_ether_addr(addr->sa_data))
  		return -EADDRNOTAVAIL;
  	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
  	mutex_lock(&team->lock);
  	list_for_each_entry(port, &team->port_list, list)
  		if (team->ops.port_change_dev_addr)
  			team->ops.port_change_dev_addr(team, port);
  	mutex_unlock(&team->lock);
  	return 0;
  }
  
  static int team_change_mtu(struct net_device *dev, int new_mtu)
  {
  	struct team *team = netdev_priv(dev);
  	struct team_port *port;
  	int err;
  
  	/*
  	 * Alhough this is reader, it's guarded by team lock. It's not possible
  	 * to traverse list in reverse under rcu_read_lock
  	 */
  	mutex_lock(&team->lock);
  	team->port_mtu_change_allowed = true;
  	list_for_each_entry(port, &team->port_list, list) {
  		err = dev_set_mtu(port->dev, new_mtu);
  		if (err) {
  			netdev_err(dev, "Device %s failed to change mtu",
  				   port->dev->name);
  			goto unwind;
  		}
  	}
  	team->port_mtu_change_allowed = false;
  	mutex_unlock(&team->lock);
  
  	dev->mtu = new_mtu;
  
  	return 0;
  
  unwind:
  	list_for_each_entry_continue_reverse(port, &team->port_list, list)
  		dev_set_mtu(port->dev, dev->mtu);
  	team->port_mtu_change_allowed = false;
  	mutex_unlock(&team->lock);
  
  	return err;
  }
  
  static struct rtnl_link_stats64 *
  team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
  {
  	struct team *team = netdev_priv(dev);
  	struct team_pcpu_stats *p;
  	u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
  	u32 rx_dropped = 0, tx_dropped = 0;
  	unsigned int start;
  	int i;
  
  	for_each_possible_cpu(i) {
  		p = per_cpu_ptr(team->pcpu_stats, i);
  		do {
  			start = u64_stats_fetch_begin_irq(&p->syncp);
  			rx_packets	= p->rx_packets;
  			rx_bytes	= p->rx_bytes;
  			rx_multicast	= p->rx_multicast;
  			tx_packets	= p->tx_packets;
  			tx_bytes	= p->tx_bytes;
  		} while (u64_stats_fetch_retry_irq(&p->syncp, start));
  
  		stats->rx_packets	+= rx_packets;
  		stats->rx_bytes		+= rx_bytes;
  		stats->multicast	+= rx_multicast;
  		stats->tx_packets	+= tx_packets;
  		stats->tx_bytes		+= tx_bytes;
  		/*
  		 * rx_dropped & tx_dropped are u32, updated
  		 * without syncp protection.
  		 */
  		rx_dropped	+= p->rx_dropped;
  		tx_dropped	+= p->tx_dropped;
  	}
  	stats->rx_dropped	= rx_dropped;
  	stats->tx_dropped	= tx_dropped;
  	return stats;
  }
  
  static int team_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
  {
  	struct team *team = netdev_priv(dev);
  	struct team_port *port;
  	int err;
  
  	/*
  	 * Alhough this is reader, it's guarded by team lock. It's not possible
  	 * to traverse list in reverse under rcu_read_lock
  	 */
  	mutex_lock(&team->lock);
  	list_for_each_entry(port, &team->port_list, list) {
  		err = vlan_vid_add(port->dev, proto, vid);
  		if (err)
  			goto unwind;
  	}
  	mutex_unlock(&team->lock);
  
  	return 0;
  
  unwind:
  	list_for_each_entry_continue_reverse(port, &team->port_list, list)
  		vlan_vid_del(port->dev, proto, vid);
  	mutex_unlock(&team->lock);
  
  	return err;
  }
  
  static int team_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid)
  {
  	struct team *team = netdev_priv(dev);
  	struct team_port *port;
  
  	mutex_lock(&team->lock);
  	list_for_each_entry(port, &team->port_list, list)
  		vlan_vid_del(port->dev, proto, vid);
  	mutex_unlock(&team->lock);
  
  	return 0;
  }
  
  #ifdef CONFIG_NET_POLL_CONTROLLER
  static void team_poll_controller(struct net_device *dev)
  {
  }
  
  static void __team_netpoll_cleanup(struct team *team)
  {
  	struct team_port *port;
  
  	list_for_each_entry(port, &team->port_list, list)
  		team_port_disable_netpoll(port);
  }
  
  static void team_netpoll_cleanup(struct net_device *dev)
  {
  	struct team *team = netdev_priv(dev);
  
  	mutex_lock(&team->lock);
  	__team_netpoll_cleanup(team);
  	mutex_unlock(&team->lock);
  }
  
  static int team_netpoll_setup(struct net_device *dev,
  			      struct netpoll_info *npifo)
  {
  	struct team *team = netdev_priv(dev);
  	struct team_port *port;
  	int err = 0;
  
  	mutex_lock(&team->lock);
  	list_for_each_entry(port, &team->port_list, list) {
  		err = team_port_enable_netpoll(team, port);
  		if (err) {
  			__team_netpoll_cleanup(team);
  			break;
  		}
  	}
  	mutex_unlock(&team->lock);
  	return err;
  }
  #endif
  
  static int team_add_slave(struct net_device *dev, struct net_device *port_dev)
  {
  	struct team *team = netdev_priv(dev);
  	int err;
  
  	mutex_lock(&team->lock);
  	err = team_port_add(team, port_dev);
  	mutex_unlock(&team->lock);
  	return err;
  }
  
  static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
  {
  	struct team *team = netdev_priv(dev);
  	int err;
  
  	mutex_lock(&team->lock);
  	err = team_port_del(team, port_dev);
  	mutex_unlock(&team->lock);
  	return err;
  }
  
  static netdev_features_t team_fix_features(struct net_device *dev,
  					   netdev_features_t features)
  {
  	struct team_port *port;
  	struct team *team = netdev_priv(dev);
  	netdev_features_t mask;
  
  	mask = features;
  	features &= ~NETIF_F_ONE_FOR_ALL;
  	features |= NETIF_F_ALL_FOR_ALL;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(port, &team->port_list, list) {
  		features = netdev_increment_features(features,
  						     port->dev->features,
  						     mask);
  	}
  	rcu_read_unlock();
  
  	features = netdev_add_tso_features(features, mask);
  
  	return features;
  }
  
  static int team_change_carrier(struct net_device *dev, bool new_carrier)
  {
  	struct team *team = netdev_priv(dev);
  
  	team->user_carrier_enabled = true;
  
  	if (new_carrier)
  		netif_carrier_on(dev);
  	else
  		netif_carrier_off(dev);
  	return 0;
  }
  
  static const struct net_device_ops team_netdev_ops = {
  	.ndo_init		= team_init,
  	.ndo_uninit		= team_uninit,
  	.ndo_open		= team_open,
  	.ndo_stop		= team_close,
  	.ndo_start_xmit		= team_xmit,
  	.ndo_select_queue	= team_select_queue,
  	.ndo_change_rx_flags	= team_change_rx_flags,
  	.ndo_set_rx_mode	= team_set_rx_mode,
  	.ndo_set_mac_address	= team_set_mac_address,
  	.ndo_change_mtu		= team_change_mtu,
  	.ndo_get_stats64	= team_get_stats64,
  	.ndo_vlan_rx_add_vid	= team_vlan_rx_add_vid,
  	.ndo_vlan_rx_kill_vid	= team_vlan_rx_kill_vid,
  #ifdef CONFIG_NET_POLL_CONTROLLER
  	.ndo_poll_controller	= team_poll_controller,
  	.ndo_netpoll_setup	= team_netpoll_setup,
  	.ndo_netpoll_cleanup	= team_netpoll_cleanup,
  #endif
  	.ndo_add_slave		= team_add_slave,
  	.ndo_del_slave		= team_del_slave,
  	.ndo_fix_features	= team_fix_features,
  	.ndo_change_carrier     = team_change_carrier,
  	.ndo_bridge_setlink	= switchdev_port_bridge_setlink,
  	.ndo_bridge_getlink	= switchdev_port_bridge_getlink,
  	.ndo_bridge_dellink	= switchdev_port_bridge_dellink,
  	.ndo_fdb_add		= switchdev_port_fdb_add,
  	.ndo_fdb_del		= switchdev_port_fdb_del,
  	.ndo_fdb_dump		= switchdev_port_fdb_dump,
  	.ndo_features_check	= passthru_features_check,
  };
  
  /***********************
   * ethtool interface
   ***********************/
  
  static void team_ethtool_get_drvinfo(struct net_device *dev,
  				     struct ethtool_drvinfo *drvinfo)
  {
  	strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
  	strlcpy(drvinfo->version, UTS_RELEASE, sizeof(drvinfo->version));
  }
  
  static const struct ethtool_ops team_ethtool_ops = {
  	.get_drvinfo		= team_ethtool_get_drvinfo,
  	.get_link		= ethtool_op_get_link,
  };
  
  /***********************
   * rt netlink interface
   ***********************/
  
  static void team_setup_by_port(struct net_device *dev,
  			       struct net_device *port_dev)
  {
  	dev->header_ops	= port_dev->header_ops;
  	dev->type = port_dev->type;
  	dev->hard_header_len = port_dev->hard_header_len;
  	dev->addr_len = port_dev->addr_len;
  	dev->mtu = port_dev->mtu;
  	memcpy(dev->broadcast, port_dev->broadcast, port_dev->addr_len);
  	eth_hw_addr_inherit(dev, port_dev);
  }
  
  static int team_dev_type_check_change(struct net_device *dev,
  				      struct net_device *port_dev)
  {
  	struct team *team = netdev_priv(dev);
  	char *portname = port_dev->name;
  	int err;
  
  	if (dev->type == port_dev->type)
  		return 0;
  	if (!list_empty(&team->port_list)) {
  		netdev_err(dev, "Device %s is of different type
  ", portname);
  		return -EBUSY;
  	}
  	err = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, dev);
  	err = notifier_to_errno(err);
  	if (err) {
  		netdev_err(dev, "Refused to change device type
  ");
  		return err;
  	}
  	dev_uc_flush(dev);
  	dev_mc_flush(dev);
  	team_setup_by_port(dev, port_dev);
  	call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
  	return 0;
  }
  
  static void team_setup(struct net_device *dev)
  {
  	ether_setup(dev);
  
  	dev->netdev_ops = &team_netdev_ops;
  	dev->ethtool_ops = &team_ethtool_ops;
  	dev->destructor	= team_destructor;
  	dev->flags |= IFF_MULTICAST;
  	dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
  	dev->priv_flags |= IFF_NO_QUEUE;
  
  	/*
  	 * Indicate we support unicast address filtering. That way core won't
  	 * bring us to promisc mode in case a unicast addr is added.
  	 * Let this up to underlay drivers.
  	 */
  	dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
  
  	dev->features |= NETIF_F_LLTX;
  	dev->features |= NETIF_F_GRO;
  
  	/* Don't allow team devices to change network namespaces. */
  	dev->features |= NETIF_F_NETNS_LOCAL;
  
  	dev->hw_features = TEAM_VLAN_FEATURES |
  			   NETIF_F_HW_VLAN_CTAG_TX |
  			   NETIF_F_HW_VLAN_CTAG_RX |
  			   NETIF_F_HW_VLAN_CTAG_FILTER;
  
  	dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
  	dev->features |= dev->hw_features;
  }
  
  static int team_newlink(struct net *src_net, struct net_device *dev,
  			struct nlattr *tb[], struct nlattr *data[])
  {
  	if (tb[IFLA_ADDRESS] == NULL)
  		eth_hw_addr_random(dev);
  
  	return register_netdevice(dev);
  }
  
  static int team_validate(struct nlattr *tb[], struct nlattr *data[])
  {
  	if (tb[IFLA_ADDRESS]) {
  		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
  			return -EINVAL;
  		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
  			return -EADDRNOTAVAIL;
  	}
  	return 0;
  }
  
  static unsigned int team_get_num_tx_queues(void)
  {
  	return TEAM_DEFAULT_NUM_TX_QUEUES;
  }
  
  static unsigned int team_get_num_rx_queues(void)
  {
  	return TEAM_DEFAULT_NUM_RX_QUEUES;
  }
  
  static struct rtnl_link_ops team_link_ops __read_mostly = {
  	.kind			= DRV_NAME,
  	.priv_size		= sizeof(struct team),
  	.setup			= team_setup,
  	.newlink		= team_newlink,
  	.validate		= team_validate,
  	.get_num_tx_queues	= team_get_num_tx_queues,
  	.get_num_rx_queues	= team_get_num_rx_queues,
  };
  
  
  /***********************************
   * Generic netlink custom interface
   ***********************************/
  
  static struct genl_family team_nl_family = {
  	.id		= GENL_ID_GENERATE,
  	.name		= TEAM_GENL_NAME,
  	.version	= TEAM_GENL_VERSION,
  	.maxattr	= TEAM_ATTR_MAX,
  	.netnsok	= true,
  };
  
  static const struct nla_policy team_nl_policy[TEAM_ATTR_MAX + 1] = {
  	[TEAM_ATTR_UNSPEC]			= { .type = NLA_UNSPEC, },
  	[TEAM_ATTR_TEAM_IFINDEX]		= { .type = NLA_U32 },
  	[TEAM_ATTR_LIST_OPTION]			= { .type = NLA_NESTED },
  	[TEAM_ATTR_LIST_PORT]			= { .type = NLA_NESTED },
  };
  
  static const struct nla_policy
  team_nl_option_policy[TEAM_ATTR_OPTION_MAX + 1] = {
  	[TEAM_ATTR_OPTION_UNSPEC]		= { .type = NLA_UNSPEC, },
  	[TEAM_ATTR_OPTION_NAME] = {
  		.type = NLA_STRING,
  		.len = TEAM_STRING_MAX_LEN,
  	},
  	[TEAM_ATTR_OPTION_CHANGED]		= { .type = NLA_FLAG },
  	[TEAM_ATTR_OPTION_TYPE]			= { .type = NLA_U8 },
  	[TEAM_ATTR_OPTION_DATA]			= { .type = NLA_BINARY },
  };
  
  static int team_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
  {
  	struct sk_buff *msg;
  	void *hdr;
  	int err;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return -ENOMEM;
  
  	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
  			  &team_nl_family, 0, TEAM_CMD_NOOP);
  	if (!hdr) {
  		err = -EMSGSIZE;
  		goto err_msg_put;
  	}
  
  	genlmsg_end(msg, hdr);
  
  	return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
  
  err_msg_put:
  	nlmsg_free(msg);
  
  	return err;
  }
  
  /*
   * Netlink cmd functions should be locked by following two functions.
   * Since dev gets held here, that ensures dev won't disappear in between.
   */
  static struct team *team_nl_team_get(struct genl_info *info)
  {
  	struct net *net = genl_info_net(info);
  	int ifindex;
  	struct net_device *dev;
  	struct team *team;
  
  	if (!info->attrs[TEAM_ATTR_TEAM_IFINDEX])
  		return NULL;
  
  	ifindex = nla_get_u32(info->attrs[TEAM_ATTR_TEAM_IFINDEX]);
  	dev = dev_get_by_index(net, ifindex);
  	if (!dev || dev->netdev_ops != &team_netdev_ops) {
  		if (dev)
  			dev_put(dev);
  		return NULL;
  	}
  
  	team = netdev_priv(dev);
  	mutex_lock(&team->lock);
  	return team;
  }
  
  static void team_nl_team_put(struct team *team)
  {
  	mutex_unlock(&team->lock);
  	dev_put(team->dev);
  }
  
  typedef int team_nl_send_func_t(struct sk_buff *skb,
  				struct team *team, u32 portid);
  
  static int team_nl_send_unicast(struct sk_buff *skb, struct team *team, u32 portid)
  {
  	return genlmsg_unicast(dev_net(team->dev), skb, portid);
  }
  
  static int team_nl_fill_one_option_get(struct sk_buff *skb, struct team *team,
  				       struct team_option_inst *opt_inst)
  {
  	struct nlattr *option_item;
  	struct team_option *option = opt_inst->option;
  	struct team_option_inst_info *opt_inst_info = &opt_inst->info;
  	struct team_gsetter_ctx ctx;
  	int err;
  
  	ctx.info = opt_inst_info;
  	err = team_option_get(team, opt_inst, &ctx);
  	if (err)
  		return err;
  
  	option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION);
  	if (!option_item)
  		return -EMSGSIZE;
  
  	if (nla_put_string(skb, TEAM_ATTR_OPTION_NAME, option->name))
  		goto nest_cancel;
  	if (opt_inst_info->port &&
  	    nla_put_u32(skb, TEAM_ATTR_OPTION_PORT_IFINDEX,
  			opt_inst_info->port->dev->ifindex))
  		goto nest_cancel;
  	if (opt_inst->option->array_size &&
  	    nla_put_u32(skb, TEAM_ATTR_OPTION_ARRAY_INDEX,
  			opt_inst_info->array_index))
  		goto nest_cancel;
  
  	switch (option->type) {
  	case TEAM_OPTION_TYPE_U32:
  		if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32))
  			goto nest_cancel;
  		if (nla_put_u32(skb, TEAM_ATTR_OPTION_DATA, ctx.data.u32_val))
  			goto nest_cancel;
  		break;
  	case TEAM_OPTION_TYPE_STRING:
  		if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING))
  			goto nest_cancel;
  		if (nla_put_string(skb, TEAM_ATTR_OPTION_DATA,
  				   ctx.data.str_val))
  			goto nest_cancel;
  		break;
  	case TEAM_OPTION_TYPE_BINARY:
  		if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_BINARY))
  			goto nest_cancel;
  		if (nla_put(skb, TEAM_ATTR_OPTION_DATA, ctx.data.bin_val.len,
  			    ctx.data.bin_val.ptr))
  			goto nest_cancel;
  		break;
  	case TEAM_OPTION_TYPE_BOOL:
  		if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_FLAG))
  			goto nest_cancel;
  		if (ctx.data.bool_val &&
  		    nla_put_flag(skb, TEAM_ATTR_OPTION_DATA))
  			goto nest_cancel;
  		break;
  	case TEAM_OPTION_TYPE_S32:
  		if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_S32))
  			goto nest_cancel;
  		if (nla_put_s32(skb, TEAM_ATTR_OPTION_DATA, ctx.data.s32_val))
  			goto nest_cancel;
  		break;
  	default:
  		BUG();
  	}
  	if (opt_inst->removed && nla_put_flag(skb, TEAM_ATTR_OPTION_REMOVED))
  		goto nest_cancel;
  	if (opt_inst->changed) {
  		if (nla_put_flag(skb, TEAM_ATTR_OPTION_CHANGED))
  			goto nest_cancel;
  		opt_inst->changed = false;
  	}
  	nla_nest_end(skb, option_item);
  	return 0;
  
  nest_cancel:
  	nla_nest_cancel(skb, option_item);
  	return -EMSGSIZE;
  }
  
  static int __send_and_alloc_skb(struct sk_buff **pskb,
  				struct team *team, u32 portid,
  				team_nl_send_func_t *send_func)
  {
  	int err;
  
  	if (*pskb) {
  		err = send_func(*pskb, team, portid);
  		if (err)
  			return err;
  	}
  	*pskb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!*pskb)
  		return -ENOMEM;
  	return 0;
  }
  
  static int team_nl_send_options_get(struct team *team, u32 portid, u32 seq,
  				    int flags, team_nl_send_func_t *send_func,
  				    struct list_head *sel_opt_inst_list)
  {
  	struct nlattr *option_list;
  	struct nlmsghdr *nlh;
  	void *hdr;
  	struct team_option_inst *opt_inst;
  	int err;
  	struct sk_buff *skb = NULL;
  	bool incomplete;
  	int i;
  
  	opt_inst = list_first_entry(sel_opt_inst_list,
  				    struct team_option_inst, tmp_list);
  
  start_again:
  	err = __send_and_alloc_skb(&skb, team, portid, send_func);
  	if (err)
  		return err;
  
  	hdr = genlmsg_put(skb, portid, seq, &team_nl_family, flags | NLM_F_MULTI,
  			  TEAM_CMD_OPTIONS_GET);
  	if (!hdr)
  		return -EMSGSIZE;
  
  	if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
  		goto nla_put_failure;
  	option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION);
  	if (!option_list)
  		goto nla_put_failure;
  
  	i = 0;
  	incomplete = false;
  	list_for_each_entry_from(opt_inst, sel_opt_inst_list, tmp_list) {
  		err = team_nl_fill_one_option_get(skb, team, opt_inst);
  		if (err) {
  			if (err == -EMSGSIZE) {
  				if (!i)
  					goto errout;
  				incomplete = true;
  				break;
  			}
  			goto errout;
  		}
  		i++;
  	}
  
  	nla_nest_end(skb, option_list);
  	genlmsg_end(skb, hdr);
  	if (incomplete)
  		goto start_again;
  
  send_done:
  	nlh = nlmsg_put(skb, portid, seq, NLMSG_DONE, 0, flags | NLM_F_MULTI);
  	if (!nlh) {
  		err = __send_and_alloc_skb(&skb, team, portid, send_func);
  		if (err)
  			goto errout;
  		goto send_done;
  	}
  
  	return send_func(skb, team, portid);
  
  nla_put_failure:
  	err = -EMSGSIZE;
  errout:
  	genlmsg_cancel(skb, hdr);
  	nlmsg_free(skb);
  	return err;
  }
  
  static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info)
  {
  	struct team *team;
  	struct team_option_inst *opt_inst;
  	int err;
  	LIST_HEAD(sel_opt_inst_list);
  
  	team = team_nl_team_get(info);
  	if (!team)
  		return -EINVAL;
  
  	list_for_each_entry(opt_inst, &team->option_inst_list, list)
  		list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list);
  	err = team_nl_send_options_get(team, info->snd_portid, info->snd_seq,
  				       NLM_F_ACK, team_nl_send_unicast,
  				       &sel_opt_inst_list);
  
  	team_nl_team_put(team);
  
  	return err;
  }
  
  static int team_nl_send_event_options_get(struct team *team,
  					  struct list_head *sel_opt_inst_list);
  
  static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
  {
  	struct team *team;
  	int err = 0;
  	int i;
  	struct nlattr *nl_option;
  	LIST_HEAD(opt_inst_list);
  
  	team = team_nl_team_get(info);
  	if (!team)
  		return -EINVAL;
  
  	err = -EINVAL;
  	if (!info->attrs[TEAM_ATTR_LIST_OPTION]) {
  		err = -EINVAL;
  		goto team_put;
  	}
  
  	nla_for_each_nested(nl_option, info->attrs[TEAM_ATTR_LIST_OPTION], i) {
  		struct nlattr *opt_attrs[TEAM_ATTR_OPTION_MAX + 1];
  		struct nlattr *attr;
  		struct nlattr *attr_data;
  		enum team_option_type opt_type;
  		int opt_port_ifindex = 0; /* != 0 for per-port options */
  		u32 opt_array_index = 0;
  		bool opt_is_array = false;
  		struct team_option_inst *opt_inst;
  		char *opt_name;
  		bool opt_found = false;
  
  		if (nla_type(nl_option) != TEAM_ATTR_ITEM_OPTION) {
  			err = -EINVAL;
  			goto team_put;
  		}
  		err = nla_parse_nested(opt_attrs, TEAM_ATTR_OPTION_MAX,
  				       nl_option, team_nl_option_policy);
  		if (err)
  			goto team_put;
  		if (!opt_attrs[TEAM_ATTR_OPTION_NAME] ||
  		    !opt_attrs[TEAM_ATTR_OPTION_TYPE]) {
  			err = -EINVAL;
  			goto team_put;
  		}
  		switch (nla_get_u8(opt_attrs[TEAM_ATTR_OPTION_TYPE])) {
  		case NLA_U32:
  			opt_type = TEAM_OPTION_TYPE_U32;
  			break;
  		case NLA_STRING:
  			opt_type = TEAM_OPTION_TYPE_STRING;
  			break;
  		case NLA_BINARY:
  			opt_type = TEAM_OPTION_TYPE_BINARY;
  			break;
  		case NLA_FLAG:
  			opt_type = TEAM_OPTION_TYPE_BOOL;
  			break;
  		case NLA_S32:
  			opt_type = TEAM_OPTION_TYPE_S32;
  			break;
  		default:
  			goto team_put;
  		}
  
  		attr_data = opt_attrs[TEAM_ATTR_OPTION_DATA];
  		if (opt_type != TEAM_OPTION_TYPE_BOOL && !attr_data) {
  			err = -EINVAL;
  			goto team_put;
  		}
  
  		opt_name = nla_data(opt_attrs[TEAM_ATTR_OPTION_NAME]);
  		attr = opt_attrs[TEAM_ATTR_OPTION_PORT_IFINDEX];
  		if (attr)
  			opt_port_ifindex = nla_get_u32(attr);
  
  		attr = opt_attrs[TEAM_ATTR_OPTION_ARRAY_INDEX];
  		if (attr) {
  			opt_is_array = true;
  			opt_array_index = nla_get_u32(attr);
  		}
  
  		list_for_each_entry(opt_inst, &team->option_inst_list, list) {
  			struct team_option *option = opt_inst->option;
  			struct team_gsetter_ctx ctx;
  			struct team_option_inst_info *opt_inst_info;
  			int tmp_ifindex;
  
  			opt_inst_info = &opt_inst->info;
  			tmp_ifindex = opt_inst_info->port ?
  				      opt_inst_info->port->dev->ifindex : 0;
  			if (option->type != opt_type ||
  			    strcmp(option->name, opt_name) ||
  			    tmp_ifindex != opt_port_ifindex ||
  			    (option->array_size && !opt_is_array) ||
  			    opt_inst_info->array_index != opt_array_index)
  				continue;
  			opt_found = true;
  			ctx.info = opt_inst_info;
  			switch (opt_type) {
  			case TEAM_OPTION_TYPE_U32:
  				ctx.data.u32_val = nla_get_u32(attr_data);
  				break;
  			case TEAM_OPTION_TYPE_STRING:
  				if (nla_len(attr_data) > TEAM_STRING_MAX_LEN) {
  					err = -EINVAL;
  					goto team_put;
  				}
  				ctx.data.str_val = nla_data(attr_data);
  				break;
  			case TEAM_OPTION_TYPE_BINARY:
  				ctx.data.bin_val.len = nla_len(attr_data);
  				ctx.data.bin_val.ptr = nla_data(attr_data);
  				break;
  			case TEAM_OPTION_TYPE_BOOL:
  				ctx.data.bool_val = attr_data ? true : false;
  				break;
  			case TEAM_OPTION_TYPE_S32:
  				ctx.data.s32_val = nla_get_s32(attr_data);
  				break;
  			default:
  				BUG();
  			}
  			err = team_option_set(team, opt_inst, &ctx);
  			if (err)
  				goto team_put;
  			opt_inst->changed = true;
  			list_add(&opt_inst->tmp_list, &opt_inst_list);
  		}
  		if (!opt_found) {
  			err = -ENOENT;
  			goto team_put;
  		}
  	}
  
  	err = team_nl_send_event_options_get(team, &opt_inst_list);
  
  team_put:
  	team_nl_team_put(team);
  
  	return err;
  }
  
  static int team_nl_fill_one_port_get(struct sk_buff *skb,
  				     struct team_port *port)
  {
  	struct nlattr *port_item;
  
  	port_item = nla_nest_start(skb, TEAM_ATTR_ITEM_PORT);
  	if (!port_item)
  		goto nest_cancel;
  	if (nla_put_u32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex))
  		goto nest_cancel;
  	if (port->changed) {
  		if (nla_put_flag(skb, TEAM_ATTR_PORT_CHANGED))
  			goto nest_cancel;
  		port->changed = false;
  	}
  	if ((port->removed &&
  	     nla_put_flag(skb, TEAM_ATTR_PORT_REMOVED)) ||
  	    (port->state.linkup &&
  	     nla_put_flag(skb, TEAM_ATTR_PORT_LINKUP)) ||
  	    nla_put_u32(skb, TEAM_ATTR_PORT_SPEED, port->state.speed) ||
  	    nla_put_u8(skb, TEAM_ATTR_PORT_DUPLEX, port->state.duplex))
  		goto nest_cancel;
  	nla_nest_end(skb, port_item);
  	return 0;
  
  nest_cancel:
  	nla_nest_cancel(skb, port_item);
  	return -EMSGSIZE;
  }
  
  static int team_nl_send_port_list_get(struct team *team, u32 portid, u32 seq,
  				      int flags, team_nl_send_func_t *send_func,
  				      struct team_port *one_port)
  {
  	struct nlattr *port_list;
  	struct nlmsghdr *nlh;
  	void *hdr;
  	struct team_port *port;
  	int err;
  	struct sk_buff *skb = NULL;
  	bool incomplete;
  	int i;
  
  	port = list_first_entry_or_null(&team->port_list,
  					struct team_port, list);
  
  start_again:
  	err = __send_and_alloc_skb(&skb, team, portid, send_func);
  	if (err)
  		return err;
  
  	hdr = genlmsg_put(skb, portid, seq, &team_nl_family, flags | NLM_F_MULTI,
  			  TEAM_CMD_PORT_LIST_GET);
  	if (!hdr)
  		return -EMSGSIZE;
  
  	if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
  		goto nla_put_failure;
  	port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT);
  	if (!port_list)
  		goto nla_put_failure;
  
  	i = 0;
  	incomplete = false;
  
  	/* If one port is selected, called wants to send port list containing
  	 * only this port. Otherwise go through all listed ports and send all
  	 */
  	if (one_port) {
  		err = team_nl_fill_one_port_get(skb, one_port);
  		if (err)
  			goto errout;
  	} else if (port) {
  		list_for_each_entry_from(port, &team->port_list, list) {
  			err = team_nl_fill_one_port_get(skb, port);
  			if (err) {
  				if (err == -EMSGSIZE) {
  					if (!i)
  						goto errout;
  					incomplete = true;
  					break;
  				}
  				goto errout;
  			}
  			i++;
  		}
  	}
  
  	nla_nest_end(skb, port_list);
  	genlmsg_end(skb, hdr);
  	if (incomplete)
  		goto start_again;
  
  send_done:
  	nlh = nlmsg_put(skb, portid, seq, NLMSG_DONE, 0, flags | NLM_F_MULTI);
  	if (!nlh) {
  		err = __send_and_alloc_skb(&skb, team, portid, send_func);
  		if (err)
  			goto errout;
  		goto send_done;
  	}
  
  	return send_func(skb, team, portid);
  
  nla_put_failure:
  	err = -EMSGSIZE;
  errout:
  	genlmsg_cancel(skb, hdr);
  	nlmsg_free(skb);
  	return err;
  }
  
  static int team_nl_cmd_port_list_get(struct sk_buff *skb,
  				     struct genl_info *info)
  {
  	struct team *team;
  	int err;
  
  	team = team_nl_team_get(info);
  	if (!team)
  		return -EINVAL;
  
  	err = team_nl_send_port_list_get(team, info->snd_portid, info->snd_seq,
  					 NLM_F_ACK, team_nl_send_unicast, NULL);
  
  	team_nl_team_put(team);
  
  	return err;
  }
  
  static const struct genl_ops team_nl_ops[] = {
  	{
  		.cmd = TEAM_CMD_NOOP,
  		.doit = team_nl_cmd_noop,
  		.policy = team_nl_policy,
  	},
  	{
  		.cmd = TEAM_CMD_OPTIONS_SET,
  		.doit = team_nl_cmd_options_set,
  		.policy = team_nl_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = TEAM_CMD_OPTIONS_GET,
  		.doit = team_nl_cmd_options_get,
  		.policy = team_nl_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = TEAM_CMD_PORT_LIST_GET,
  		.doit = team_nl_cmd_port_list_get,
  		.policy = team_nl_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  };
  
  static const struct genl_multicast_group team_nl_mcgrps[] = {
  	{ .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME, },
  };
  
  static int team_nl_send_multicast(struct sk_buff *skb,
  				  struct team *team, u32 portid)
  {
  	return genlmsg_multicast_netns(&team_nl_family, dev_net(team->dev),
  				       skb, 0, 0, GFP_KERNEL);
  }
  
  static int team_nl_send_event_options_get(struct team *team,
  					  struct list_head *sel_opt_inst_list)
  {
  	return team_nl_send_options_get(team, 0, 0, 0, team_nl_send_multicast,
  					sel_opt_inst_list);
  }
  
  static int team_nl_send_event_port_get(struct team *team,
  				       struct team_port *port)
  {
  	return team_nl_send_port_list_get(team, 0, 0, 0, team_nl_send_multicast,
  					  port);
  }
  
  static int team_nl_init(void)
  {
  	return genl_register_family_with_ops_groups(&team_nl_family, team_nl_ops,
  						    team_nl_mcgrps);
  }
  
  static void team_nl_fini(void)
  {
  	genl_unregister_family(&team_nl_family);
  }
  
  
  /******************
   * Change checkers
   ******************/
  
  static void __team_options_change_check(struct team *team)
  {
  	int err;
  	struct team_option_inst *opt_inst;
  	LIST_HEAD(sel_opt_inst_list);
  
  	list_for_each_entry(opt_inst, &team->option_inst_list, list) {
  		if (opt_inst->changed)
  			list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list);
  	}
  	err = team_nl_send_event_options_get(team, &sel_opt_inst_list);
  	if (err && err != -ESRCH)
  		netdev_warn(team->dev, "Failed to send options change via netlink (err %d)
  ",
  			    err);
  }
  
  /* rtnl lock is held */
  
  static void __team_port_change_send(struct team_port *port, bool linkup)
  {
  	int err;
  
  	port->changed = true;
  	port->state.linkup = linkup;
  	team_refresh_port_linkup(port);
  	if (linkup) {
  		struct ethtool_cmd ecmd;
  
  		err = __ethtool_get_settings(port->dev, &ecmd);
  		if (!err) {
  			port->state.speed = ethtool_cmd_speed(&ecmd);
  			port->state.duplex = ecmd.duplex;
  			goto send_event;
  		}
  	}
  	port->state.speed = 0;
  	port->state.duplex = 0;
  
  send_event:
  	err = team_nl_send_event_port_get(port->team, port);
  	if (err && err != -ESRCH)
  		netdev_warn(port->team->dev, "Failed to send port change of device %s via netlink (err %d)
  ",
  			    port->dev->name, err);
  
  }
  
  static void __team_carrier_check(struct team *team)
  {
  	struct team_port *port;
  	bool team_linkup;
  
  	if (team->user_carrier_enabled)
  		return;
  
  	team_linkup = false;
  	list_for_each_entry(port, &team->port_list, list) {
  		if (port->linkup) {
  			team_linkup = true;
  			break;
  		}
  	}
  
  	if (team_linkup)
  		netif_carrier_on(team->dev);
  	else
  		netif_carrier_off(team->dev);
  }
  
  static void __team_port_change_check(struct team_port *port, bool linkup)
  {
  	if (port->state.linkup != linkup)
  		__team_port_change_send(port, linkup);
  	__team_carrier_check(port->team);
  }
  
  static void __team_port_change_port_added(struct team_port *port, bool linkup)
  {
  	__team_port_change_send(port, linkup);
  	__team_carrier_check(port->team);
  }
  
  static void __team_port_change_port_removed(struct team_port *port)
  {
  	port->removed = true;
  	__team_port_change_send(port, false);
  	__team_carrier_check(port->team);
  }
  
  static void team_port_change_check(struct team_port *port, bool linkup)
  {
  	struct team *team = port->team;
  
  	mutex_lock(&team->lock);
  	__team_port_change_check(port, linkup);
  	mutex_unlock(&team->lock);
  }
  
  
  /************************************
   * Net device notifier event handler
   ************************************/
  
  static int team_device_event(struct notifier_block *unused,
  			     unsigned long event, void *ptr)
  {
  	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
  	struct team_port *port;
  
  	port = team_port_get_rtnl(dev);
  	if (!port)
  		return NOTIFY_DONE;
  
  	switch (event) {
  	case NETDEV_UP:
  		if (netif_carrier_ok(dev))
  			team_port_change_check(port, true);
  		break;
  	case NETDEV_DOWN:
  		team_port_change_check(port, false);
  		break;
  	case NETDEV_CHANGE:
  		if (netif_running(port->dev))
  			team_port_change_check(port,
  					       !!netif_carrier_ok(port->dev));
  		break;
  	case NETDEV_UNREGISTER:
  		team_del_slave(port->team->dev, dev);
  		break;
  	case NETDEV_FEAT_CHANGE:
  		team_compute_features(port->team);
  		break;
  	case NETDEV_PRECHANGEMTU:
  		/* Forbid to change mtu of underlaying device */
  		if (!port->team->port_mtu_change_allowed)
  			return NOTIFY_BAD;
  		break;
  	case NETDEV_PRE_TYPE_CHANGE:
  		/* Forbid to change type of underlaying device */
  		return NOTIFY_BAD;
  	case NETDEV_RESEND_IGMP:
  		/* Propagate to master device */
  		call_netdevice_notifiers(event, port->team->dev);
  		break;
  	}
  	return NOTIFY_DONE;
  }
  
  static struct notifier_block team_notifier_block __read_mostly = {
  	.notifier_call = team_device_event,
  };
  
  
  /***********************
   * Module init and exit
   ***********************/
  
  static int __init team_module_init(void)
  {
  	int err;
  
  	register_netdevice_notifier(&team_notifier_block);
  
  	err = rtnl_link_register(&team_link_ops);
  	if (err)
  		goto err_rtnl_reg;
  
  	err = team_nl_init();
  	if (err)
  		goto err_nl_init;
  
  	return 0;
  
  err_nl_init:
  	rtnl_link_unregister(&team_link_ops);
  
  err_rtnl_reg:
  	unregister_netdevice_notifier(&team_notifier_block);
  
  	return err;
  }
  
  static void __exit team_module_exit(void)
  {
  	team_nl_fini();
  	rtnl_link_unregister(&team_link_ops);
  	unregister_netdevice_notifier(&team_notifier_block);
  }
  
  module_init(team_module_init);
  module_exit(team_module_exit);
  
  MODULE_LICENSE("GPL v2");
  MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
  MODULE_DESCRIPTION("Ethernet team device driver");
  MODULE_ALIAS_RTNL_LINK(DRV_NAME);