team: Simplify return path of team_newlink

[deliverable/linux.git] / drivers / net / team / team.c

/*
 * 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 <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)
{
        struct team_port *port = rcu_dereference(dev->rx_handler_data);

        return team_port_exists(dev) ? port : NULL;
}

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)
{
        struct team_port *port;
        int err;

        if (!option->per_port) {
                err = __team_option_inst_add(team, option, NULL);
                if (err)
                        goto inst_del_option;
        }

        list_for_each_entry(port, &team->port_list, list) {
                err = __team_option_inst_add(team, option, port);
                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\n");
                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\n");
                return -EINVAL;
        }

        new_mode = team_mode_get(kind);
        if (!new_mode) {
                netdev_err(dev, "Mode \"%s\" not found\n", kind);
                return -EINVAL;
        }

        err = __team_change_mode(team, new_mode);
        if (err) {
                netdev_err(dev, "Failed to change to mode \"%s\"\n", kind);
                team_mode_put(new_mode);
                return err;
        }

        netdev_info(dev, "Mode changed to \"%s\"\n", kind);
        return 0;
}


/*********************
 * Peers notification
 *********************/

static void team_notify_peers_work(struct work_struct *work)
{
        struct team *team;

        team = container_of(work, struct team, notify_peers.dw.work);

        if (!rtnl_trylock()) {
                schedule_delayed_work(&team->notify_peers.dw, 0);
                return;
        }
        call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, team->dev);
        rtnl_unlock();
        if (!atomic_dec_and_test(&team->notify_peers.count_pending))
                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_set(&team->notify_peers.count_pending, team->notify_peers.count);
        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;

        team = container_of(work, struct team, mcast_rejoin.dw.work);

        if (!rtnl_trylock()) {
                schedule_delayed_work(&team->mcast_rejoin.dw, 0);
                return;
        }
        call_netdevice_notifiers(NETDEV_RESEND_IGMP, team->dev);
        rtnl_unlock();
        if (!atomic_dec_and_test(&team->mcast_rejoin.count_pending))
                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_set(&team->mcast_rejoin.count_pending, team->mcast_rejoin.count);
        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\n",
                   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 flags, dst_release_flag = IFF_XMIT_DST_RELEASE;

        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;

        flags = team->dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
        team->dev->priv_flags = flags | dst_release_flag;

        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);
}

static int team_port_enter(struct team *team, struct team_port *port)
{
        int err = 0;

        dev_hold(team->dev);
        port->dev->priv_flags |= IFF_TEAM_PORT;
        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\n",
                                   port->dev->name);
                        goto err_port_enter;
                }
        }

        return 0;

err_port_enter:
        port->dev->priv_flags &= ~IFF_TEAM_PORT;
        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);
        port->dev->priv_flags &= ~IFF_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 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\n",
                           portname);
                return -EINVAL;
        }

        if (team_port_exists(port_dev)) {
                netdev_err(dev, "Device %s is already a port "
                                "of a team device\n", 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\n",
                           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\n",
                           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\n", 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\n",
                           portname);
                goto err_port_enter;
        }

        err = dev_open(port_dev);
        if (err) {
                netdev_dbg(dev, "Device %s opening failed\n",
                           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\n",
                                portname);
                goto err_vids_add;
        }

        err = team_port_enable_netpoll(team, port);
        if (err) {
                netdev_err(dev, "Failed to enable netpoll on device %s\n",
                           portname);
                goto err_enable_netpoll;
        }

        err = netdev_master_upper_dev_link(port_dev, dev);
        if (err) {
                netdev_err(dev, "Device %s failed to set upper link\n",
                           portname);
                goto err_set_upper_link;
        }

        err = netdev_rx_handler_register(port_dev, team_handle_frame,
                                         port);
        if (err) {
                netdev_err(dev, "Device %s failed to register rx_handler\n",
                           portname);
                goto err_handler_register;
        }

        err = __team_option_inst_add_port(team, port);
        if (err) {
                netdev_err(dev, "Device %s failed to add per-port options\n",
                           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\n", portname);

        return 0;

err_option_port_add:
        netdev_rx_handler_unregister(port_dev);

err_handler_register:
        netdev_upper_dev_unlink(port_dev, dev);

err_set_upper_link:
        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\n",
                           portname);
                return -ENOENT;
        }

        team_port_disable(team, port);
        list_del_rcu(&port->list);
        netdev_rx_handler_unregister(port_dev);
        netdev_upper_dev_unlink(port_dev, 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\n", 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);
        rcu_read_lock();
        list_for_each_entry_rcu(port, &team->port_list, list)
                if (team->ops.port_change_dev_addr)
                        team->ops.port_change_dev_addr(team, port);
        rcu_read_unlock();
        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;

        rcu_read_lock();
        list_for_each_entry_rcu(port, &team->port_list, list)
                vlan_vid_del(port->dev, proto, vid);
        rcu_read_unlock();

        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();
        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,
};

/***********************
 * 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\n", 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\n");
                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->tx_queue_len = 0;
        dev->flags |= IFF_MULTICAST;
        dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);

        /*
         * 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)\n",
                            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)\n",
                            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);